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linux-sg2042/fs/ceph/file.c

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ceph: factor out libceph from Ceph file system This factors out protocol and low-level storage parts of ceph into a separate libceph module living in net/ceph and include/linux/ceph. This is mostly a matter of moving files around. However, a few key pieces of the interface change as well: - ceph_client becomes ceph_fs_client and ceph_client, where the latter captures the mon and osd clients, and the fs_client gets the mds client and file system specific pieces. - Mount option parsing and debugfs setup is correspondingly broken into two pieces. - The mon client gets a generic handler callback for otherwise unknown messages (mds map, in this case). - The basic supported/required feature bits can be expanded (and are by ceph_fs_client). No functional change, aside from some subtle error handling cases that got cleaned up in the refactoring process. Signed-off-by: Sage Weil <sage@newdream.net>
2010-04-07 06:14:15 +08:00
#include <linux/ceph/ceph_debug.h>
ceph: file operations File open and close operations, and read and write methods that ensure we have obtained the proper capabilities from the MDS cluster before performing IO on a file. We take references on held capabilities for the duration of the read/write to avoid prematurely releasing them back to the MDS. We implement two main paths for read and write: one that is buffered (and uses generic_aio_{read,write}), and one that is fully synchronous and blocking (operating either on a __user pointer or, if O_DIRECT, directly on user pages). Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-07 02:31:08 +08:00
ceph: factor out libceph from Ceph file system This factors out protocol and low-level storage parts of ceph into a separate libceph module living in net/ceph and include/linux/ceph. This is mostly a matter of moving files around. However, a few key pieces of the interface change as well: - ceph_client becomes ceph_fs_client and ceph_client, where the latter captures the mon and osd clients, and the fs_client gets the mds client and file system specific pieces. - Mount option parsing and debugfs setup is correspondingly broken into two pieces. - The mon client gets a generic handler callback for otherwise unknown messages (mds map, in this case). - The basic supported/required feature bits can be expanded (and are by ceph_fs_client). No functional change, aside from some subtle error handling cases that got cleaned up in the refactoring process. Signed-off-by: Sage Weil <sage@newdream.net>
2010-04-07 06:14:15 +08:00
#include <linux/module.h>
ceph: file operations File open and close operations, and read and write methods that ensure we have obtained the proper capabilities from the MDS cluster before performing IO on a file. We take references on held capabilities for the duration of the read/write to avoid prematurely releasing them back to the MDS. We implement two main paths for read and write: one that is buffered (and uses generic_aio_{read,write}), and one that is fully synchronous and blocking (operating either on a __user pointer or, if O_DIRECT, directly on user pages). Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-07 02:31:08 +08:00
#include <linux/sched.h>
include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h percpu.h is included by sched.h and module.h and thus ends up being included when building most .c files. percpu.h includes slab.h which in turn includes gfp.h making everything defined by the two files universally available and complicating inclusion dependencies. percpu.h -> slab.h dependency is about to be removed. Prepare for this change by updating users of gfp and slab facilities include those headers directly instead of assuming availability. As this conversion needs to touch large number of source files, the following script is used as the basis of conversion. http://userweb.kernel.org/~tj/misc/slabh-sweep.py The script does the followings. * Scan files for gfp and slab usages and update includes such that only the necessary includes are there. ie. if only gfp is used, gfp.h, if slab is used, slab.h. * When the script inserts a new include, it looks at the include blocks and try to put the new include such that its order conforms to its surrounding. It's put in the include block which contains core kernel includes, in the same order that the rest are ordered - alphabetical, Christmas tree, rev-Xmas-tree or at the end if there doesn't seem to be any matching order. * If the script can't find a place to put a new include (mostly because the file doesn't have fitting include block), it prints out an error message indicating which .h file needs to be added to the file. The conversion was done in the following steps. 1. The initial automatic conversion of all .c files updated slightly over 4000 files, deleting around 700 includes and adding ~480 gfp.h and ~3000 slab.h inclusions. The script emitted errors for ~400 files. 2. Each error was manually checked. Some didn't need the inclusion, some needed manual addition while adding it to implementation .h or embedding .c file was more appropriate for others. This step added inclusions to around 150 files. 3. The script was run again and the output was compared to the edits from #2 to make sure no file was left behind. 4. Several build tests were done and a couple of problems were fixed. e.g. lib/decompress_*.c used malloc/free() wrappers around slab APIs requiring slab.h to be added manually. 5. The script was run on all .h files but without automatically editing them as sprinkling gfp.h and slab.h inclusions around .h files could easily lead to inclusion dependency hell. Most gfp.h inclusion directives were ignored as stuff from gfp.h was usually wildly available and often used in preprocessor macros. Each slab.h inclusion directive was examined and added manually as necessary. 6. percpu.h was updated not to include slab.h. 7. Build test were done on the following configurations and failures were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my distributed build env didn't work with gcov compiles) and a few more options had to be turned off depending on archs to make things build (like ipr on powerpc/64 which failed due to missing writeq). * x86 and x86_64 UP and SMP allmodconfig and a custom test config. * powerpc and powerpc64 SMP allmodconfig * sparc and sparc64 SMP allmodconfig * ia64 SMP allmodconfig * s390 SMP allmodconfig * alpha SMP allmodconfig * um on x86_64 SMP allmodconfig 8. percpu.h modifications were reverted so that it could be applied as a separate patch and serve as bisection point. Given the fact that I had only a couple of failures from tests on step 6, I'm fairly confident about the coverage of this conversion patch. If there is a breakage, it's likely to be something in one of the arch headers which should be easily discoverable easily on most builds of the specific arch. Signed-off-by: Tejun Heo <tj@kernel.org> Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
2010-03-24 16:04:11 +08:00
#include <linux/slab.h>
ceph: file operations File open and close operations, and read and write methods that ensure we have obtained the proper capabilities from the MDS cluster before performing IO on a file. We take references on held capabilities for the duration of the read/write to avoid prematurely releasing them back to the MDS. We implement two main paths for read and write: one that is buffered (and uses generic_aio_{read,write}), and one that is fully synchronous and blocking (operating either on a __user pointer or, if O_DIRECT, directly on user pages). Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-07 02:31:08 +08:00
#include <linux/file.h>
ceph: simplify+fix atomic_open The initial ->atomic_open op was carried over from the old intent code, which was incomplete and didn't really work. Replace it with a fresh method. In particular: * always attempt to do an atomic open+lookup, both for the create case and for lookups of existing files. * fix symlink handling by returning 1 to the VFS so that we can follow the link to its destination. This fixes a longstanding ceph bug (#2392). Signed-off-by: Sage Weil <sage@inktank.com>
2012-08-01 02:27:36 +08:00
#include <linux/mount.h>
ceph: file operations File open and close operations, and read and write methods that ensure we have obtained the proper capabilities from the MDS cluster before performing IO on a file. We take references on held capabilities for the duration of the read/write to avoid prematurely releasing them back to the MDS. We implement two main paths for read and write: one that is buffered (and uses generic_aio_{read,write}), and one that is fully synchronous and blocking (operating either on a __user pointer or, if O_DIRECT, directly on user pages). Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-07 02:31:08 +08:00
#include <linux/namei.h>
#include <linux/writeback.h>
aio: don't include aio.h in sched.h Faster kernel compiles by way of fewer unnecessary includes. [akpm@linux-foundation.org: fix fallout] [akpm@linux-foundation.org: fix build] Signed-off-by: Kent Overstreet <koverstreet@google.com> Cc: Zach Brown <zab@redhat.com> Cc: Felipe Balbi <balbi@ti.com> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Mark Fasheh <mfasheh@suse.com> Cc: Joel Becker <jlbec@evilplan.org> Cc: Rusty Russell <rusty@rustcorp.com.au> Cc: Jens Axboe <axboe@kernel.dk> Cc: Asai Thambi S P <asamymuthupa@micron.com> Cc: Selvan Mani <smani@micron.com> Cc: Sam Bradshaw <sbradshaw@micron.com> Cc: Jeff Moyer <jmoyer@redhat.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Benjamin LaHaise <bcrl@kvack.org> Reviewed-by: "Theodore Ts'o" <tytso@mit.edu> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-05-08 07:19:08 +08:00
#include <linux/aio.h>
ceph: punch hole support This patch implements fallocate and punch hole support for Ceph kernel client. Signed-off-by: Li Wang <liwang@ubuntukylin.com> Signed-off-by: Yunchuan Wen <yunchuanwen@ubuntukylin.com>
2013-08-15 11:51:44 +08:00
#include <linux/falloc.h>
ceph: file operations File open and close operations, and read and write methods that ensure we have obtained the proper capabilities from the MDS cluster before performing IO on a file. We take references on held capabilities for the duration of the read/write to avoid prematurely releasing them back to the MDS. We implement two main paths for read and write: one that is buffered (and uses generic_aio_{read,write}), and one that is fully synchronous and blocking (operating either on a __user pointer or, if O_DIRECT, directly on user pages). Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-07 02:31:08 +08:00
#include "super.h"
#include "mds_client.h"
ceph: use fscache as a local presisent cache Adding support for fscache to the Ceph filesystem. This would bring it to on par with some of the other network filesystems in Linux (like NFS, AFS, etc...) In order to mount the filesystem with fscache the 'fsc' mount option must be passed. Signed-off-by: Milosz Tanski <milosz@adfin.com> Signed-off-by: Sage Weil <sage@inktank.com>
2013-08-22 05:29:54 +08:00
#include "cache.h"
ceph: file operations File open and close operations, and read and write methods that ensure we have obtained the proper capabilities from the MDS cluster before performing IO on a file. We take references on held capabilities for the duration of the read/write to avoid prematurely releasing them back to the MDS. We implement two main paths for read and write: one that is buffered (and uses generic_aio_{read,write}), and one that is fully synchronous and blocking (operating either on a __user pointer or, if O_DIRECT, directly on user pages). Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-07 02:31:08 +08:00
/*
* Ceph file operations
*
* Implement basic open/close functionality, and implement
* read/write.
*
* We implement three modes of file I/O:
* - buffered uses the generic_file_aio_{read,write} helpers
*
* - synchronous is used when there is multi-client read/write
* sharing, avoids the page cache, and synchronously waits for an
* ack from the OSD.
*
* - direct io takes the variant of the sync path that references
* user pages directly.
*
* fsync() flushes and waits on dirty pages, but just queues metadata
* for writeback: since the MDS can recover size and mtime there is no
* need to wait for MDS acknowledgement.
*/
/*
* Prepare an open request. Preallocate ceph_cap to avoid an
* inopportune ENOMEM later.
*/
static struct ceph_mds_request *
prepare_open_request(struct super_block *sb, int flags, int create_mode)
{
ceph: factor out libceph from Ceph file system This factors out protocol and low-level storage parts of ceph into a separate libceph module living in net/ceph and include/linux/ceph. This is mostly a matter of moving files around. However, a few key pieces of the interface change as well: - ceph_client becomes ceph_fs_client and ceph_client, where the latter captures the mon and osd clients, and the fs_client gets the mds client and file system specific pieces. - Mount option parsing and debugfs setup is correspondingly broken into two pieces. - The mon client gets a generic handler callback for otherwise unknown messages (mds map, in this case). - The basic supported/required feature bits can be expanded (and are by ceph_fs_client). No functional change, aside from some subtle error handling cases that got cleaned up in the refactoring process. Signed-off-by: Sage Weil <sage@newdream.net>
2010-04-07 06:14:15 +08:00
struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
struct ceph_mds_client *mdsc = fsc->mdsc;
ceph: file operations File open and close operations, and read and write methods that ensure we have obtained the proper capabilities from the MDS cluster before performing IO on a file. We take references on held capabilities for the duration of the read/write to avoid prematurely releasing them back to the MDS. We implement two main paths for read and write: one that is buffered (and uses generic_aio_{read,write}), and one that is fully synchronous and blocking (operating either on a __user pointer or, if O_DIRECT, directly on user pages). Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-07 02:31:08 +08:00
struct ceph_mds_request *req;
int want_auth = USE_ANY_MDS;
int op = (flags & O_CREAT) ? CEPH_MDS_OP_CREATE : CEPH_MDS_OP_OPEN;
if (flags & (O_WRONLY|O_RDWR|O_CREAT|O_TRUNC))
want_auth = USE_AUTH_MDS;
req = ceph_mdsc_create_request(mdsc, op, want_auth);
if (IS_ERR(req))
goto out;
req->r_fmode = ceph_flags_to_mode(flags);
req->r_args.open.flags = cpu_to_le32(flags);
req->r_args.open.mode = cpu_to_le32(create_mode);
out:
return req;
}
/*
* initialize private struct file data.
* if we fail, clean up by dropping fmode reference on the ceph_inode
*/
static int ceph_init_file(struct inode *inode, struct file *file, int fmode)
{
struct ceph_file_info *cf;
int ret = 0;
ceph: use fscache as a local presisent cache Adding support for fscache to the Ceph filesystem. This would bring it to on par with some of the other network filesystems in Linux (like NFS, AFS, etc...) In order to mount the filesystem with fscache the 'fsc' mount option must be passed. Signed-off-by: Milosz Tanski <milosz@adfin.com> Signed-off-by: Sage Weil <sage@inktank.com>
2013-08-22 05:29:54 +08:00
struct ceph_inode_info *ci = ceph_inode(inode);
struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb);
struct ceph_mds_client *mdsc = fsc->mdsc;
ceph: file operations File open and close operations, and read and write methods that ensure we have obtained the proper capabilities from the MDS cluster before performing IO on a file. We take references on held capabilities for the duration of the read/write to avoid prematurely releasing them back to the MDS. We implement two main paths for read and write: one that is buffered (and uses generic_aio_{read,write}), and one that is fully synchronous and blocking (operating either on a __user pointer or, if O_DIRECT, directly on user pages). Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-07 02:31:08 +08:00
switch (inode->i_mode & S_IFMT) {
case S_IFREG:
ceph: use fscache as a local presisent cache Adding support for fscache to the Ceph filesystem. This would bring it to on par with some of the other network filesystems in Linux (like NFS, AFS, etc...) In order to mount the filesystem with fscache the 'fsc' mount option must be passed. Signed-off-by: Milosz Tanski <milosz@adfin.com> Signed-off-by: Sage Weil <sage@inktank.com>
2013-08-22 05:29:54 +08:00
/* First file open request creates the cookie, we want to keep
* this cookie around for the filetime of the inode as not to
* have to worry about fscache register / revoke / operation
* races.
*
* Also, if we know the operation is going to invalidate data
* (non readonly) just nuke the cache right away.
*/
ceph_fscache_register_inode_cookie(mdsc->fsc, ci);
if ((fmode & CEPH_FILE_MODE_WR))
ceph_fscache_invalidate(inode);
ceph: file operations File open and close operations, and read and write methods that ensure we have obtained the proper capabilities from the MDS cluster before performing IO on a file. We take references on held capabilities for the duration of the read/write to avoid prematurely releasing them back to the MDS. We implement two main paths for read and write: one that is buffered (and uses generic_aio_{read,write}), and one that is fully synchronous and blocking (operating either on a __user pointer or, if O_DIRECT, directly on user pages). Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-07 02:31:08 +08:00
case S_IFDIR:
dout("init_file %p %p 0%o (regular)\n", inode, file,
inode->i_mode);
cf = kmem_cache_alloc(ceph_file_cachep, GFP_NOFS | __GFP_ZERO);
if (cf == NULL) {
ceph_put_fmode(ceph_inode(inode), fmode); /* clean up */
return -ENOMEM;
}
cf->fmode = fmode;
cf->next_offset = 2;
file->private_data = cf;
BUG_ON(inode->i_fop->release != ceph_release);
break;
case S_IFLNK:
dout("init_file %p %p 0%o (symlink)\n", inode, file,
inode->i_mode);
ceph_put_fmode(ceph_inode(inode), fmode); /* clean up */
break;
default:
dout("init_file %p %p 0%o (special)\n", inode, file,
inode->i_mode);
/*
* we need to drop the open ref now, since we don't
* have .release set to ceph_release.
*/
ceph_put_fmode(ceph_inode(inode), fmode); /* clean up */
BUG_ON(inode->i_fop->release == ceph_release);
/* call the proper open fop */
ret = inode->i_fop->open(inode, file);
}
return ret;
}
/*
* If we already have the requisite capabilities, we can satisfy
* the open request locally (no need to request new caps from the
* MDS). We do, however, need to inform the MDS (asynchronously)
* if our wanted caps set expands.
*/
int ceph_open(struct inode *inode, struct file *file)
{
struct ceph_inode_info *ci = ceph_inode(inode);
ceph: factor out libceph from Ceph file system This factors out protocol and low-level storage parts of ceph into a separate libceph module living in net/ceph and include/linux/ceph. This is mostly a matter of moving files around. However, a few key pieces of the interface change as well: - ceph_client becomes ceph_fs_client and ceph_client, where the latter captures the mon and osd clients, and the fs_client gets the mds client and file system specific pieces. - Mount option parsing and debugfs setup is correspondingly broken into two pieces. - The mon client gets a generic handler callback for otherwise unknown messages (mds map, in this case). - The basic supported/required feature bits can be expanded (and are by ceph_fs_client). No functional change, aside from some subtle error handling cases that got cleaned up in the refactoring process. Signed-off-by: Sage Weil <sage@newdream.net>
2010-04-07 06:14:15 +08:00
struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb);
struct ceph_mds_client *mdsc = fsc->mdsc;
ceph: file operations File open and close operations, and read and write methods that ensure we have obtained the proper capabilities from the MDS cluster before performing IO on a file. We take references on held capabilities for the duration of the read/write to avoid prematurely releasing them back to the MDS. We implement two main paths for read and write: one that is buffered (and uses generic_aio_{read,write}), and one that is fully synchronous and blocking (operating either on a __user pointer or, if O_DIRECT, directly on user pages). Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-07 02:31:08 +08:00
struct ceph_mds_request *req;
struct ceph_file_info *cf = file->private_data;
ceph: protect access to d_parent d_parent is protected by d_lock: use it when looking up a dentry's parent directory inode. Also take a reference and drop it in the caller to avoid a use-after-free. Reported-by: Al Viro <viro@ZenIV.linux.org.uk> Reviewed-by: Yehuda Sadeh <yehuda@hq.newdream.net> Signed-off-by: Sage Weil <sage@newdream.net>
2011-07-27 02:30:29 +08:00
struct inode *parent_inode = NULL;
ceph: file operations File open and close operations, and read and write methods that ensure we have obtained the proper capabilities from the MDS cluster before performing IO on a file. We take references on held capabilities for the duration of the read/write to avoid prematurely releasing them back to the MDS. We implement two main paths for read and write: one that is buffered (and uses generic_aio_{read,write}), and one that is fully synchronous and blocking (operating either on a __user pointer or, if O_DIRECT, directly on user pages). Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-07 02:31:08 +08:00
int err;
int flags, fmode, wanted;
if (cf) {
dout("open file %p is already opened\n", file);
return 0;
}
/* filter out O_CREAT|O_EXCL; vfs did that already. yuck. */
flags = file->f_flags & ~(O_CREAT|O_EXCL);
if (S_ISDIR(inode->i_mode))
flags = O_DIRECTORY; /* mds likes to know */
dout("open inode %p ino %llx.%llx file %p flags %d (%d)\n", inode,
ceph_vinop(inode), file, flags, file->f_flags);
fmode = ceph_flags_to_mode(flags);
wanted = ceph_caps_for_mode(fmode);
/* snapped files are read-only */
if (ceph_snap(inode) != CEPH_NOSNAP && (file->f_mode & FMODE_WRITE))
return -EROFS;
/* trivially open snapdir */
if (ceph_snap(inode) == CEPH_SNAPDIR) {
ceph: use i_ceph_lock instead of i_lock We have been using i_lock to protect all kinds of data structures in the ceph_inode_info struct, including lists of inodes that we need to iterate over while avoiding races with inode destruction. That requires grabbing a reference to the inode with the list lock protected, but igrab() now takes i_lock to check the inode flags. Changing the list lock ordering would be a painful process. However, using a ceph-specific i_ceph_lock in the ceph inode instead of i_lock is a simple mechanical change and avoids the ordering constraints imposed by igrab(). Reported-by: Amon Ott <a.ott@m-privacy.de> Signed-off-by: Sage Weil <sage@newdream.net>
2011-12-01 01:47:09 +08:00
spin_lock(&ci->i_ceph_lock);
ceph: file operations File open and close operations, and read and write methods that ensure we have obtained the proper capabilities from the MDS cluster before performing IO on a file. We take references on held capabilities for the duration of the read/write to avoid prematurely releasing them back to the MDS. We implement two main paths for read and write: one that is buffered (and uses generic_aio_{read,write}), and one that is fully synchronous and blocking (operating either on a __user pointer or, if O_DIRECT, directly on user pages). Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-07 02:31:08 +08:00
__ceph_get_fmode(ci, fmode);
ceph: use i_ceph_lock instead of i_lock We have been using i_lock to protect all kinds of data structures in the ceph_inode_info struct, including lists of inodes that we need to iterate over while avoiding races with inode destruction. That requires grabbing a reference to the inode with the list lock protected, but igrab() now takes i_lock to check the inode flags. Changing the list lock ordering would be a painful process. However, using a ceph-specific i_ceph_lock in the ceph inode instead of i_lock is a simple mechanical change and avoids the ordering constraints imposed by igrab(). Reported-by: Amon Ott <a.ott@m-privacy.de> Signed-off-by: Sage Weil <sage@newdream.net>
2011-12-01 01:47:09 +08:00
spin_unlock(&ci->i_ceph_lock);
ceph: file operations File open and close operations, and read and write methods that ensure we have obtained the proper capabilities from the MDS cluster before performing IO on a file. We take references on held capabilities for the duration of the read/write to avoid prematurely releasing them back to the MDS. We implement two main paths for read and write: one that is buffered (and uses generic_aio_{read,write}), and one that is fully synchronous and blocking (operating either on a __user pointer or, if O_DIRECT, directly on user pages). Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-07 02:31:08 +08:00
return ceph_init_file(inode, file, fmode);
}
/*
ceph: fix open for write on clustered mds Normally when we open a file we already have a cap, and simply update the wanted set. However, if we open a file for write, but don't have an auth cap, that doesn't work; we need to open a new cap with the auth MDS. Only reuse existing caps if we are opening for read or the existing cap is auth. Signed-off-by: Sage Weil <sage@newdream.net>
2010-11-08 01:07:15 +08:00
* No need to block if we have caps on the auth MDS (for
* write) or any MDS (for read). Update wanted set
ceph: file operations File open and close operations, and read and write methods that ensure we have obtained the proper capabilities from the MDS cluster before performing IO on a file. We take references on held capabilities for the duration of the read/write to avoid prematurely releasing them back to the MDS. We implement two main paths for read and write: one that is buffered (and uses generic_aio_{read,write}), and one that is fully synchronous and blocking (operating either on a __user pointer or, if O_DIRECT, directly on user pages). Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-07 02:31:08 +08:00
* asynchronously.
*/
ceph: use i_ceph_lock instead of i_lock We have been using i_lock to protect all kinds of data structures in the ceph_inode_info struct, including lists of inodes that we need to iterate over while avoiding races with inode destruction. That requires grabbing a reference to the inode with the list lock protected, but igrab() now takes i_lock to check the inode flags. Changing the list lock ordering would be a painful process. However, using a ceph-specific i_ceph_lock in the ceph inode instead of i_lock is a simple mechanical change and avoids the ordering constraints imposed by igrab(). Reported-by: Amon Ott <a.ott@m-privacy.de> Signed-off-by: Sage Weil <sage@newdream.net>
2011-12-01 01:47:09 +08:00
spin_lock(&ci->i_ceph_lock);
ceph: fix open for write on clustered mds Normally when we open a file we already have a cap, and simply update the wanted set. However, if we open a file for write, but don't have an auth cap, that doesn't work; we need to open a new cap with the auth MDS. Only reuse existing caps if we are opening for read or the existing cap is auth. Signed-off-by: Sage Weil <sage@newdream.net>
2010-11-08 01:07:15 +08:00
if (__ceph_is_any_real_caps(ci) &&
(((fmode & CEPH_FILE_MODE_WR) == 0) || ci->i_auth_cap)) {
ceph: file operations File open and close operations, and read and write methods that ensure we have obtained the proper capabilities from the MDS cluster before performing IO on a file. We take references on held capabilities for the duration of the read/write to avoid prematurely releasing them back to the MDS. We implement two main paths for read and write: one that is buffered (and uses generic_aio_{read,write}), and one that is fully synchronous and blocking (operating either on a __user pointer or, if O_DIRECT, directly on user pages). Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-07 02:31:08 +08:00
int mds_wanted = __ceph_caps_mds_wanted(ci);
int issued = __ceph_caps_issued(ci, NULL);
dout("open %p fmode %d want %s issued %s using existing\n",
inode, fmode, ceph_cap_string(wanted),
ceph_cap_string(issued));
__ceph_get_fmode(ci, fmode);
ceph: use i_ceph_lock instead of i_lock We have been using i_lock to protect all kinds of data structures in the ceph_inode_info struct, including lists of inodes that we need to iterate over while avoiding races with inode destruction. That requires grabbing a reference to the inode with the list lock protected, but igrab() now takes i_lock to check the inode flags. Changing the list lock ordering would be a painful process. However, using a ceph-specific i_ceph_lock in the ceph inode instead of i_lock is a simple mechanical change and avoids the ordering constraints imposed by igrab(). Reported-by: Amon Ott <a.ott@m-privacy.de> Signed-off-by: Sage Weil <sage@newdream.net>
2011-12-01 01:47:09 +08:00
spin_unlock(&ci->i_ceph_lock);
ceph: file operations File open and close operations, and read and write methods that ensure we have obtained the proper capabilities from the MDS cluster before performing IO on a file. We take references on held capabilities for the duration of the read/write to avoid prematurely releasing them back to the MDS. We implement two main paths for read and write: one that is buffered (and uses generic_aio_{read,write}), and one that is fully synchronous and blocking (operating either on a __user pointer or, if O_DIRECT, directly on user pages). Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-07 02:31:08 +08:00
/* adjust wanted? */
if ((issued & wanted) != wanted &&
(mds_wanted & wanted) != wanted &&
ceph_snap(inode) != CEPH_SNAPDIR)
ceph_check_caps(ci, 0, NULL);
return ceph_init_file(inode, file, fmode);
} else if (ceph_snap(inode) != CEPH_NOSNAP &&
(ci->i_snap_caps & wanted) == wanted) {
__ceph_get_fmode(ci, fmode);
ceph: use i_ceph_lock instead of i_lock We have been using i_lock to protect all kinds of data structures in the ceph_inode_info struct, including lists of inodes that we need to iterate over while avoiding races with inode destruction. That requires grabbing a reference to the inode with the list lock protected, but igrab() now takes i_lock to check the inode flags. Changing the list lock ordering would be a painful process. However, using a ceph-specific i_ceph_lock in the ceph inode instead of i_lock is a simple mechanical change and avoids the ordering constraints imposed by igrab(). Reported-by: Amon Ott <a.ott@m-privacy.de> Signed-off-by: Sage Weil <sage@newdream.net>
2011-12-01 01:47:09 +08:00
spin_unlock(&ci->i_ceph_lock);
ceph: file operations File open and close operations, and read and write methods that ensure we have obtained the proper capabilities from the MDS cluster before performing IO on a file. We take references on held capabilities for the duration of the read/write to avoid prematurely releasing them back to the MDS. We implement two main paths for read and write: one that is buffered (and uses generic_aio_{read,write}), and one that is fully synchronous and blocking (operating either on a __user pointer or, if O_DIRECT, directly on user pages). Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-07 02:31:08 +08:00
return ceph_init_file(inode, file, fmode);
}
ceph: use fscache as a local presisent cache Adding support for fscache to the Ceph filesystem. This would bring it to on par with some of the other network filesystems in Linux (like NFS, AFS, etc...) In order to mount the filesystem with fscache the 'fsc' mount option must be passed. Signed-off-by: Milosz Tanski <milosz@adfin.com> Signed-off-by: Sage Weil <sage@inktank.com>
2013-08-22 05:29:54 +08:00
ceph: use i_ceph_lock instead of i_lock We have been using i_lock to protect all kinds of data structures in the ceph_inode_info struct, including lists of inodes that we need to iterate over while avoiding races with inode destruction. That requires grabbing a reference to the inode with the list lock protected, but igrab() now takes i_lock to check the inode flags. Changing the list lock ordering would be a painful process. However, using a ceph-specific i_ceph_lock in the ceph inode instead of i_lock is a simple mechanical change and avoids the ordering constraints imposed by igrab(). Reported-by: Amon Ott <a.ott@m-privacy.de> Signed-off-by: Sage Weil <sage@newdream.net>
2011-12-01 01:47:09 +08:00
spin_unlock(&ci->i_ceph_lock);
ceph: file operations File open and close operations, and read and write methods that ensure we have obtained the proper capabilities from the MDS cluster before performing IO on a file. We take references on held capabilities for the duration of the read/write to avoid prematurely releasing them back to the MDS. We implement two main paths for read and write: one that is buffered (and uses generic_aio_{read,write}), and one that is fully synchronous and blocking (operating either on a __user pointer or, if O_DIRECT, directly on user pages). Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-07 02:31:08 +08:00
dout("open fmode %d wants %s\n", fmode, ceph_cap_string(wanted));
req = prepare_open_request(inode->i_sb, flags, 0);
if (IS_ERR(req)) {
err = PTR_ERR(req);
goto out;
}
ceph: use ihold when we already have an inode ref We should use ihold whenever we already have a stable inode ref, even when we aren't holding i_lock. This avoids adding new and unnecessary locking dependencies. Signed-off-by: Sage Weil <sage@newdream.net>
2011-05-28 00:24:26 +08:00
req->r_inode = inode;
ihold(inode);
ceph: use fscache as a local presisent cache Adding support for fscache to the Ceph filesystem. This would bring it to on par with some of the other network filesystems in Linux (like NFS, AFS, etc...) In order to mount the filesystem with fscache the 'fsc' mount option must be passed. Signed-off-by: Milosz Tanski <milosz@adfin.com> Signed-off-by: Sage Weil <sage@inktank.com>
2013-08-22 05:29:54 +08:00
ceph: file operations File open and close operations, and read and write methods that ensure we have obtained the proper capabilities from the MDS cluster before performing IO on a file. We take references on held capabilities for the duration of the read/write to avoid prematurely releasing them back to the MDS. We implement two main paths for read and write: one that is buffered (and uses generic_aio_{read,write}), and one that is fully synchronous and blocking (operating either on a __user pointer or, if O_DIRECT, directly on user pages). Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-07 02:31:08 +08:00
req->r_num_caps = 1;
ceph: protect access to d_parent d_parent is protected by d_lock: use it when looking up a dentry's parent directory inode. Also take a reference and drop it in the caller to avoid a use-after-free. Reported-by: Al Viro <viro@ZenIV.linux.org.uk> Reviewed-by: Yehuda Sadeh <yehuda@hq.newdream.net> Signed-off-by: Sage Weil <sage@newdream.net>
2011-07-27 02:30:29 +08:00
if (flags & (O_CREAT|O_TRUNC))
parent_inode = ceph_get_dentry_parent_inode(file->f_dentry);
ceph: file operations File open and close operations, and read and write methods that ensure we have obtained the proper capabilities from the MDS cluster before performing IO on a file. We take references on held capabilities for the duration of the read/write to avoid prematurely releasing them back to the MDS. We implement two main paths for read and write: one that is buffered (and uses generic_aio_{read,write}), and one that is fully synchronous and blocking (operating either on a __user pointer or, if O_DIRECT, directly on user pages). Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-07 02:31:08 +08:00
err = ceph_mdsc_do_request(mdsc, parent_inode, req);
ceph: protect access to d_parent d_parent is protected by d_lock: use it when looking up a dentry's parent directory inode. Also take a reference and drop it in the caller to avoid a use-after-free. Reported-by: Al Viro <viro@ZenIV.linux.org.uk> Reviewed-by: Yehuda Sadeh <yehuda@hq.newdream.net> Signed-off-by: Sage Weil <sage@newdream.net>
2011-07-27 02:30:29 +08:00
iput(parent_inode);
ceph: file operations File open and close operations, and read and write methods that ensure we have obtained the proper capabilities from the MDS cluster before performing IO on a file. We take references on held capabilities for the duration of the read/write to avoid prematurely releasing them back to the MDS. We implement two main paths for read and write: one that is buffered (and uses generic_aio_{read,write}), and one that is fully synchronous and blocking (operating either on a __user pointer or, if O_DIRECT, directly on user pages). Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-07 02:31:08 +08:00
if (!err)
err = ceph_init_file(inode, file, req->r_fmode);
ceph_mdsc_put_request(req);
dout("open result=%d on %llx.%llx\n", err, ceph_vinop(inode));
out:
return err;
}
/*
ceph: simplify+fix atomic_open The initial ->atomic_open op was carried over from the old intent code, which was incomplete and didn't really work. Replace it with a fresh method. In particular: * always attempt to do an atomic open+lookup, both for the create case and for lookups of existing files. * fix symlink handling by returning 1 to the VFS so that we can follow the link to its destination. This fixes a longstanding ceph bug (#2392). Signed-off-by: Sage Weil <sage@inktank.com>
2012-08-01 02:27:36 +08:00
* Do a lookup + open with a single request. If we get a non-existent
* file or symlink, return 1 so the VFS can retry.
ceph: file operations File open and close operations, and read and write methods that ensure we have obtained the proper capabilities from the MDS cluster before performing IO on a file. We take references on held capabilities for the duration of the read/write to avoid prematurely releasing them back to the MDS. We implement two main paths for read and write: one that is buffered (and uses generic_aio_{read,write}), and one that is fully synchronous and blocking (operating either on a __user pointer or, if O_DIRECT, directly on user pages). Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-07 02:31:08 +08:00
*/
ceph: simplify+fix atomic_open The initial ->atomic_open op was carried over from the old intent code, which was incomplete and didn't really work. Replace it with a fresh method. In particular: * always attempt to do an atomic open+lookup, both for the create case and for lookups of existing files. * fix symlink handling by returning 1 to the VFS so that we can follow the link to its destination. This fixes a longstanding ceph bug (#2392). Signed-off-by: Sage Weil <sage@inktank.com>
2012-08-01 02:27:36 +08:00
int ceph_atomic_open(struct inode *dir, struct dentry *dentry,
kill struct opendata Just pass struct file *. Methods are happier that way... There's no need to return struct file * from finish_open() now, so let it return int. Next: saner prototypes for parts in namei.c Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-06-22 16:40:19 +08:00
struct file *file, unsigned flags, umode_t mode,
make ->atomic_open() return int Change of calling conventions: old new NULL 1 file 0 ERR_PTR(-ve) -ve Caller *knows* that struct file *; no need to return it. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-06-22 16:39:14 +08:00
int *opened)
ceph: file operations File open and close operations, and read and write methods that ensure we have obtained the proper capabilities from the MDS cluster before performing IO on a file. We take references on held capabilities for the duration of the read/write to avoid prematurely releasing them back to the MDS. We implement two main paths for read and write: one that is buffered (and uses generic_aio_{read,write}), and one that is fully synchronous and blocking (operating either on a __user pointer or, if O_DIRECT, directly on user pages). Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-07 02:31:08 +08:00
{
ceph: factor out libceph from Ceph file system This factors out protocol and low-level storage parts of ceph into a separate libceph module living in net/ceph and include/linux/ceph. This is mostly a matter of moving files around. However, a few key pieces of the interface change as well: - ceph_client becomes ceph_fs_client and ceph_client, where the latter captures the mon and osd clients, and the fs_client gets the mds client and file system specific pieces. - Mount option parsing and debugfs setup is correspondingly broken into two pieces. - The mon client gets a generic handler callback for otherwise unknown messages (mds map, in this case). - The basic supported/required feature bits can be expanded (and are by ceph_fs_client). No functional change, aside from some subtle error handling cases that got cleaned up in the refactoring process. Signed-off-by: Sage Weil <sage@newdream.net>
2010-04-07 06:14:15 +08:00
struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
struct ceph_mds_client *mdsc = fsc->mdsc;
ceph: file operations File open and close operations, and read and write methods that ensure we have obtained the proper capabilities from the MDS cluster before performing IO on a file. We take references on held capabilities for the duration of the read/write to avoid prematurely releasing them back to the MDS. We implement two main paths for read and write: one that is buffered (and uses generic_aio_{read,write}), and one that is fully synchronous and blocking (operating either on a __user pointer or, if O_DIRECT, directly on user pages). Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-07 02:31:08 +08:00
struct ceph_mds_request *req;
ceph: simplify+fix atomic_open The initial ->atomic_open op was carried over from the old intent code, which was incomplete and didn't really work. Replace it with a fresh method. In particular: * always attempt to do an atomic open+lookup, both for the create case and for lookups of existing files. * fix symlink handling by returning 1 to the VFS so that we can follow the link to its destination. This fixes a longstanding ceph bug (#2392). Signed-off-by: Sage Weil <sage@inktank.com>
2012-08-01 02:27:36 +08:00
struct dentry *dn;
ceph: file operations File open and close operations, and read and write methods that ensure we have obtained the proper capabilities from the MDS cluster before performing IO on a file. We take references on held capabilities for the duration of the read/write to avoid prematurely releasing them back to the MDS. We implement two main paths for read and write: one that is buffered (and uses generic_aio_{read,write}), and one that is fully synchronous and blocking (operating either on a __user pointer or, if O_DIRECT, directly on user pages). Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-07 02:31:08 +08:00
int err;
ceph: simplify+fix atomic_open The initial ->atomic_open op was carried over from the old intent code, which was incomplete and didn't really work. Replace it with a fresh method. In particular: * always attempt to do an atomic open+lookup, both for the create case and for lookups of existing files. * fix symlink handling by returning 1 to the VFS so that we can follow the link to its destination. This fixes a longstanding ceph bug (#2392). Signed-off-by: Sage Weil <sage@inktank.com>
2012-08-01 02:27:36 +08:00
dout("atomic_open %p dentry %p '%.*s' %s flags %d mode 0%o\n",
dir, dentry, dentry->d_name.len, dentry->d_name.name,
d_unhashed(dentry) ? "unhashed" : "hashed", flags, mode);
if (dentry->d_name.len > NAME_MAX)
return -ENAMETOOLONG;
err = ceph_init_dentry(dentry);
if (err < 0)
return err;
ceph: file operations File open and close operations, and read and write methods that ensure we have obtained the proper capabilities from the MDS cluster before performing IO on a file. We take references on held capabilities for the duration of the read/write to avoid prematurely releasing them back to the MDS. We implement two main paths for read and write: one that is buffered (and uses generic_aio_{read,write}), and one that is fully synchronous and blocking (operating either on a __user pointer or, if O_DIRECT, directly on user pages). Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-07 02:31:08 +08:00
/* do the open */
req = prepare_open_request(dir->i_sb, flags, mode);
if (IS_ERR(req))
make ->atomic_open() return int Change of calling conventions: old new NULL 1 file 0 ERR_PTR(-ve) -ve Caller *knows* that struct file *; no need to return it. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-06-22 16:39:14 +08:00
return PTR_ERR(req);
ceph: file operations File open and close operations, and read and write methods that ensure we have obtained the proper capabilities from the MDS cluster before performing IO on a file. We take references on held capabilities for the duration of the read/write to avoid prematurely releasing them back to the MDS. We implement two main paths for read and write: one that is buffered (and uses generic_aio_{read,write}), and one that is fully synchronous and blocking (operating either on a __user pointer or, if O_DIRECT, directly on user pages). Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-07 02:31:08 +08:00
req->r_dentry = dget(dentry);
req->r_num_caps = 2;
if (flags & O_CREAT) {
req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
}
req->r_locked_dir = dir; /* caller holds dir->i_mutex */
ceph: fix bad parent_inode calc in ceph_lookup_open We were always getting NULL here because the intent file f_dentry is always NULL at this point, which means we were always passing NULL to ceph_mdsc_do_request. In reality, this was fine, since this isn't currently ever a write operation that needs to get strung on the dir's unsafe list. Use the dir explicitly, and only pass it if this open has side-effects that a dir fsync should flush. Reviewed-by: Yehuda Sadeh <yehuda@hq.newdream.net> Signed-off-by: Sage Weil <sage@newdream.net>
2011-07-27 02:27:48 +08:00
err = ceph_mdsc_do_request(mdsc,
(flags & (O_CREAT|O_TRUNC)) ? dir : NULL,
req);
ceph: Check for err on mds request in atomic_open The error returned by ceph_mdsc_do_request includes errors sending the request, errors on timeout, or any errors coming from the mds. If ceph_mdsc_do_request returns an error, the reply struct will most likely be bogus. We need to bail out and propogate the error instead of overwriting it. Signed-off-by: Sam Lang <sam.lang@inktank.com> Reviewed-by: Sage Weil <sage@inktank.com>
2012-12-20 03:44:23 +08:00
if (err)
goto out_err;
ceph: fix ceph_lookup_open intent usage We weren't properly calling lookup_instantiate_filp when setting up the lookup intent, which could lead to file leakage on errors. So: - use separate helper for the hidden snapdir translation, immediately following the mds request - use ceph_finish_lookup for the final dentry/return value dance in the exit path - lookup_instantiate_filp on success Reported-by: Al Viro <viro@ZenIV.linux.org.uk> Reviewed-by: Yehuda Sadeh <yehuda@hq.newdream.net> Signed-off-by: Sage Weil <sage@newdream.net>
2011-07-27 02:28:11 +08:00
err = ceph_handle_snapdir(req, dentry, err);
ceph: simplify+fix atomic_open The initial ->atomic_open op was carried over from the old intent code, which was incomplete and didn't really work. Replace it with a fresh method. In particular: * always attempt to do an atomic open+lookup, both for the create case and for lookups of existing files. * fix symlink handling by returning 1 to the VFS so that we can follow the link to its destination. This fixes a longstanding ceph bug (#2392). Signed-off-by: Sage Weil <sage@inktank.com>
2012-08-01 02:27:36 +08:00
if (err == 0 && (flags & O_CREAT) && !req->r_reply_info.head->is_dentry)
ceph: file operations File open and close operations, and read and write methods that ensure we have obtained the proper capabilities from the MDS cluster before performing IO on a file. We take references on held capabilities for the duration of the read/write to avoid prematurely releasing them back to the MDS. We implement two main paths for read and write: one that is buffered (and uses generic_aio_{read,write}), and one that is fully synchronous and blocking (operating either on a __user pointer or, if O_DIRECT, directly on user pages). Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-07 02:31:08 +08:00
err = ceph_handle_notrace_create(dir, dentry);
ceph: implement i_op->atomic_open() Add an ->atomic_open implementation which replaces the atomic lookup+open+create operation implemented via ->lookup and ->create operations. Signed-off-by: Miklos Szeredi <mszeredi@suse.cz> CC: Sage Weil <sage@newdream.net> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-06-05 21:10:25 +08:00
ceph: simplify+fix atomic_open The initial ->atomic_open op was carried over from the old intent code, which was incomplete and didn't really work. Replace it with a fresh method. In particular: * always attempt to do an atomic open+lookup, both for the create case and for lookups of existing files. * fix symlink handling by returning 1 to the VFS so that we can follow the link to its destination. This fixes a longstanding ceph bug (#2392). Signed-off-by: Sage Weil <sage@inktank.com>
2012-08-01 02:27:36 +08:00
if (d_unhashed(dentry)) {
dn = ceph_finish_lookup(req, dentry, err);
if (IS_ERR(dn))
err = PTR_ERR(dn);
} else {
/* we were given a hashed negative dentry */
dn = NULL;
}
if (err)
goto out_err;
if (dn || dentry->d_inode == NULL || S_ISLNK(dentry->d_inode->i_mode)) {
/* make vfs retry on splice, ENOENT, or symlink */
dout("atomic_open finish_no_open on dn %p\n", dn);
err = finish_no_open(file, dn);
} else {
dout("atomic_open finish_open on dn %p\n", dn);
ceph: Check for created flag in response from mds The mds now sends back a created inode if the create request performed the create. If the file already existed, no inode is returned in the reply. This allows ceph to set the created flag in atomic_open so that permissions are properly checked in the case that the file wasn't created by the create call to the mds. To ensure compability with previous kernels, a feature for sending back the inode in the create reply was added, so that the mds will only send back the inode if the client indicates it supports the feature. Signed-off-by: Sam Lang <sam.lang@inktank.com> Reviewed-by: Sage Weil <sage@inktank.com>
2012-12-29 01:56:46 +08:00
if (req->r_op == CEPH_MDS_OP_CREATE && req->r_reply_info.has_create_ino) {
*opened |= FILE_CREATED;
}
ceph: simplify+fix atomic_open The initial ->atomic_open op was carried over from the old intent code, which was incomplete and didn't really work. Replace it with a fresh method. In particular: * always attempt to do an atomic open+lookup, both for the create case and for lookups of existing files. * fix symlink handling by returning 1 to the VFS so that we can follow the link to its destination. This fixes a longstanding ceph bug (#2392). Signed-off-by: Sage Weil <sage@inktank.com>
2012-08-01 02:27:36 +08:00
err = finish_open(file, dentry, ceph_open, opened);
}
ceph: implement i_op->atomic_open() Add an ->atomic_open implementation which replaces the atomic lookup+open+create operation implemented via ->lookup and ->create operations. Signed-off-by: Miklos Szeredi <mszeredi@suse.cz> CC: Sage Weil <sage@newdream.net> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-06-05 21:10:25 +08:00
ceph: simplify+fix atomic_open The initial ->atomic_open op was carried over from the old intent code, which was incomplete and didn't really work. Replace it with a fresh method. In particular: * always attempt to do an atomic open+lookup, both for the create case and for lookups of existing files. * fix symlink handling by returning 1 to the VFS so that we can follow the link to its destination. This fixes a longstanding ceph bug (#2392). Signed-off-by: Sage Weil <sage@inktank.com>
2012-08-01 02:27:36 +08:00
out_err:
ceph_mdsc_put_request(req);
dout("atomic_open result=%d\n", err);
make ->atomic_open() return int Change of calling conventions: old new NULL 1 file 0 ERR_PTR(-ve) -ve Caller *knows* that struct file *; no need to return it. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-06-22 16:39:14 +08:00
return err;
ceph: file operations File open and close operations, and read and write methods that ensure we have obtained the proper capabilities from the MDS cluster before performing IO on a file. We take references on held capabilities for the duration of the read/write to avoid prematurely releasing them back to the MDS. We implement two main paths for read and write: one that is buffered (and uses generic_aio_{read,write}), and one that is fully synchronous and blocking (operating either on a __user pointer or, if O_DIRECT, directly on user pages). Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-07 02:31:08 +08:00
}
int ceph_release(struct inode *inode, struct file *file)
{
struct ceph_inode_info *ci = ceph_inode(inode);
struct ceph_file_info *cf = file->private_data;
dout("release inode %p file %p\n", inode, file);
ceph_put_fmode(ci, cf->fmode);
if (cf->last_readdir)
ceph_mdsc_put_request(cf->last_readdir);
kfree(cf->last_name);
kfree(cf->dir_info);
dput(cf->dentry);
kmem_cache_free(ceph_file_cachep, cf);
ceph: return EBADF if waiting for caps on closed file Verify the file is actually open for the given caps when we are waiting for caps. This ensures we will wake up and return EBADF if another thread closes the file out from under us. Note that EBADF is also the correct return code from write(2) when called on a file handle opened for reading (although the vfs should catch that). Signed-off-by: Sage Weil <sage@newdream.net>
2010-03-02 01:57:54 +08:00
/* wake up anyone waiting for caps on this inode */
ceph: use complete_all and wake_up_all This fixes an issue triggered by running concurrent syncs. One of the syncs would go through while the other would just hang indefinitely. In any case, we never actually want to wake a single waiter, so the *_all functions should be used. Signed-off-by: Yehuda Sadeh <yehuda@hq.newdream.net> Signed-off-by: Sage Weil <sage@newdream.net>
2010-07-28 04:11:08 +08:00
wake_up_all(&ci->i_cap_wq);
ceph: file operations File open and close operations, and read and write methods that ensure we have obtained the proper capabilities from the MDS cluster before performing IO on a file. We take references on held capabilities for the duration of the read/write to avoid prematurely releasing them back to the MDS. We implement two main paths for read and write: one that is buffered (and uses generic_aio_{read,write}), and one that is fully synchronous and blocking (operating either on a __user pointer or, if O_DIRECT, directly on user pages). Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-07 02:31:08 +08:00
return 0;
}
/*
* Read a range of bytes striped over one or more objects. Iterate over
* objects we stripe over. (That's not atomic, but good enough for now.)
*
* If we get a short result from the OSD, check against i_size; we need to
* only return a short read to the caller if we hit EOF.
*/
static int striped_read(struct inode *inode,
u64 off, u64 len,
ceph: fix sync read eof check deadlock If a sync read gets a short result from the OSD, it may need to do a getattr to see if it is short due to reaching end-of-file. The getattr was being done while holding a reference to FILE_RD, which can lead to a deadlock if the MDS is revoking that capability bit and can't process the getattr until it does. We fix this by setting a flag if EOF size validation is needed, and doing the getattr in ceph_aio_read, after the RD cap ref is dropped. If the read needs to be continued, we loop and continue traversing the file. Signed-off-by: Sage Weil <sage@newdream.net>
2010-02-10 06:04:02 +08:00
struct page **pages, int num_pages,
ceph: fix short sync reads from the OSD If we get a short read from the OSD because the object is small, we need to zero the remainder of the buffer. For O_DIRECT reads, the attempted range is not trimmed to i_size by the VFS, so we were actually looping indefinitely. Fix by trimming by i_size, and the unconditionally zeroing the trailing range. Reported-by: Jeff Wu <cpwu@tnsoft.com.cn> Signed-off-by: Sage Weil <sage@newdream.net>
2011-06-02 07:08:44 +08:00
int *checkeof, bool o_direct,
ceph: fix direct-io on non-page-aligned buffers The user buffer may be 512-byte aligned, not page-aligned. We were assuming the buffer was page-aligned and only accounting for non-page-aligned io offsets. Signed-off-by: Henry C Chang <henry_c_chang@tcloudcomputing.com> Signed-off-by: Sage Weil <sage@newdream.net>
2010-12-16 12:41:54 +08:00
unsigned long buf_align)
ceph: file operations File open and close operations, and read and write methods that ensure we have obtained the proper capabilities from the MDS cluster before performing IO on a file. We take references on held capabilities for the duration of the read/write to avoid prematurely releasing them back to the MDS. We implement two main paths for read and write: one that is buffered (and uses generic_aio_{read,write}), and one that is fully synchronous and blocking (operating either on a __user pointer or, if O_DIRECT, directly on user pages). Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-07 02:31:08 +08:00
{
ceph: factor out libceph from Ceph file system This factors out protocol and low-level storage parts of ceph into a separate libceph module living in net/ceph and include/linux/ceph. This is mostly a matter of moving files around. However, a few key pieces of the interface change as well: - ceph_client becomes ceph_fs_client and ceph_client, where the latter captures the mon and osd clients, and the fs_client gets the mds client and file system specific pieces. - Mount option parsing and debugfs setup is correspondingly broken into two pieces. - The mon client gets a generic handler callback for otherwise unknown messages (mds map, in this case). - The basic supported/required feature bits can be expanded (and are by ceph_fs_client). No functional change, aside from some subtle error handling cases that got cleaned up in the refactoring process. Signed-off-by: Sage Weil <sage@newdream.net>
2010-04-07 06:14:15 +08:00
struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
ceph: file operations File open and close operations, and read and write methods that ensure we have obtained the proper capabilities from the MDS cluster before performing IO on a file. We take references on held capabilities for the duration of the read/write to avoid prematurely releasing them back to the MDS. We implement two main paths for read and write: one that is buffered (and uses generic_aio_{read,write}), and one that is fully synchronous and blocking (operating either on a __user pointer or, if O_DIRECT, directly on user pages). Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-07 02:31:08 +08:00
struct ceph_inode_info *ci = ceph_inode(inode);
ceph: cleanup types in striped_read() We pass in a u64 value for "len" and then immediately truncate away the upper 32 bits. Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Reviewed-by: Sage Weil <sage@inktank.com> Reviewed-by: Alex Elder <alex.elder@linaro.org>
2013-07-23 21:48:01 +08:00
u64 pos, this_len, left;
ceph: make page alignment explicit in osd interface We used to infer alignment of IOs within a page based on the file offset, which assumed they matched. This broke with direct IO that was not aligned to pages (e.g., 512-byte aligned IO). We were also trusting the alignment specified in the OSD reply, which could have been adjusted by the server. Explicitly specify the page alignment when setting up OSD IO requests. Signed-off-by: Sage Weil <sage@newdream.net>
2010-11-10 04:43:12 +08:00
int io_align, page_align;
ceph: cleanup types in striped_read() We pass in a u64 value for "len" and then immediately truncate away the upper 32 bits. Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Reviewed-by: Sage Weil <sage@inktank.com> Reviewed-by: Alex Elder <alex.elder@linaro.org>
2013-07-23 21:48:01 +08:00
int pages_left;
ceph: file operations File open and close operations, and read and write methods that ensure we have obtained the proper capabilities from the MDS cluster before performing IO on a file. We take references on held capabilities for the duration of the read/write to avoid prematurely releasing them back to the MDS. We implement two main paths for read and write: one that is buffered (and uses generic_aio_{read,write}), and one that is fully synchronous and blocking (operating either on a __user pointer or, if O_DIRECT, directly on user pages). Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-07 02:31:08 +08:00
int read;
struct page **page_pos;
int ret;
bool hit_stripe, was_short;
/*
* we may need to do multiple reads. not atomic, unfortunately.
*/
pos = off;
left = len;
page_pos = pages;
pages_left = num_pages;
read = 0;
ceph: make page alignment explicit in osd interface We used to infer alignment of IOs within a page based on the file offset, which assumed they matched. This broke with direct IO that was not aligned to pages (e.g., 512-byte aligned IO). We were also trusting the alignment specified in the OSD reply, which could have been adjusted by the server. Explicitly specify the page alignment when setting up OSD IO requests. Signed-off-by: Sage Weil <sage@newdream.net>
2010-11-10 04:43:12 +08:00
io_align = off & ~PAGE_MASK;
ceph: file operations File open and close operations, and read and write methods that ensure we have obtained the proper capabilities from the MDS cluster before performing IO on a file. We take references on held capabilities for the duration of the read/write to avoid prematurely releasing them back to the MDS. We implement two main paths for read and write: one that is buffered (and uses generic_aio_{read,write}), and one that is fully synchronous and blocking (operating either on a __user pointer or, if O_DIRECT, directly on user pages). Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-07 02:31:08 +08:00
more:
ceph: fix short sync reads from the OSD If we get a short read from the OSD because the object is small, we need to zero the remainder of the buffer. For O_DIRECT reads, the attempted range is not trimmed to i_size by the VFS, so we were actually looping indefinitely. Fix by trimming by i_size, and the unconditionally zeroing the trailing range. Reported-by: Jeff Wu <cpwu@tnsoft.com.cn> Signed-off-by: Sage Weil <sage@newdream.net>
2011-06-02 07:08:44 +08:00
if (o_direct)
ceph: fix direct-io on non-page-aligned buffers The user buffer may be 512-byte aligned, not page-aligned. We were assuming the buffer was page-aligned and only accounting for non-page-aligned io offsets. Signed-off-by: Henry C Chang <henry_c_chang@tcloudcomputing.com> Signed-off-by: Sage Weil <sage@newdream.net>
2010-12-16 12:41:54 +08:00
page_align = (pos - io_align + buf_align) & ~PAGE_MASK;
ceph: make page alignment explicit in osd interface We used to infer alignment of IOs within a page based on the file offset, which assumed they matched. This broke with direct IO that was not aligned to pages (e.g., 512-byte aligned IO). We were also trusting the alignment specified in the OSD reply, which could have been adjusted by the server. Explicitly specify the page alignment when setting up OSD IO requests. Signed-off-by: Sage Weil <sage@newdream.net>
2010-11-10 04:43:12 +08:00
else
page_align = pos & ~PAGE_MASK;
ceph: file operations File open and close operations, and read and write methods that ensure we have obtained the proper capabilities from the MDS cluster before performing IO on a file. We take references on held capabilities for the duration of the read/write to avoid prematurely releasing them back to the MDS. We implement two main paths for read and write: one that is buffered (and uses generic_aio_{read,write}), and one that is fully synchronous and blocking (operating either on a __user pointer or, if O_DIRECT, directly on user pages). Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-07 02:31:08 +08:00
this_len = left;
ceph: factor out libceph from Ceph file system This factors out protocol and low-level storage parts of ceph into a separate libceph module living in net/ceph and include/linux/ceph. This is mostly a matter of moving files around. However, a few key pieces of the interface change as well: - ceph_client becomes ceph_fs_client and ceph_client, where the latter captures the mon and osd clients, and the fs_client gets the mds client and file system specific pieces. - Mount option parsing and debugfs setup is correspondingly broken into two pieces. - The mon client gets a generic handler callback for otherwise unknown messages (mds map, in this case). - The basic supported/required feature bits can be expanded (and are by ceph_fs_client). No functional change, aside from some subtle error handling cases that got cleaned up in the refactoring process. Signed-off-by: Sage Weil <sage@newdream.net>
2010-04-07 06:14:15 +08:00
ret = ceph_osdc_readpages(&fsc->client->osdc, ceph_vino(inode),
ceph: file operations File open and close operations, and read and write methods that ensure we have obtained the proper capabilities from the MDS cluster before performing IO on a file. We take references on held capabilities for the duration of the read/write to avoid prematurely releasing them back to the MDS. We implement two main paths for read and write: one that is buffered (and uses generic_aio_{read,write}), and one that is fully synchronous and blocking (operating either on a __user pointer or, if O_DIRECT, directly on user pages). Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-07 02:31:08 +08:00
&ci->i_layout, pos, &this_len,
ci->i_truncate_seq,
ci->i_truncate_size,
ceph: make page alignment explicit in osd interface We used to infer alignment of IOs within a page based on the file offset, which assumed they matched. This broke with direct IO that was not aligned to pages (e.g., 512-byte aligned IO). We were also trusting the alignment specified in the OSD reply, which could have been adjusted by the server. Explicitly specify the page alignment when setting up OSD IO requests. Signed-off-by: Sage Weil <sage@newdream.net>
2010-11-10 04:43:12 +08:00
page_pos, pages_left, page_align);
ceph: file operations File open and close operations, and read and write methods that ensure we have obtained the proper capabilities from the MDS cluster before performing IO on a file. We take references on held capabilities for the duration of the read/write to avoid prematurely releasing them back to the MDS. We implement two main paths for read and write: one that is buffered (and uses generic_aio_{read,write}), and one that is fully synchronous and blocking (operating either on a __user pointer or, if O_DIRECT, directly on user pages). Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-07 02:31:08 +08:00
if (ret == -ENOENT)
ret = 0;
ceph: fix ENOENT logic in striped_read Getting ENOENT is equivalent to reading 0 bytes. Make that correction before setting up the hit_stripe and was_short flags. Fixes the following case: dd if=/dev/zero of=/mnt/fs_depot/dd3 bs=1 seek=1048576 count=0 dd if=/mnt/fs_depot/dd3 of=/root/ddout1 skip=8 bs=500 count=2 iflag=direct Reported-by: Henry C Chang <henry.cy.chang@gmail.com> Signed-off-by: Sage Weil <sage@newdream.net>
2011-06-08 11:40:35 +08:00
hit_stripe = this_len < left;
was_short = ret >= 0 && ret < this_len;
ceph: cleanup types in striped_read() We pass in a u64 value for "len" and then immediately truncate away the upper 32 bits. Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Reviewed-by: Sage Weil <sage@inktank.com> Reviewed-by: Alex Elder <alex.elder@linaro.org>
2013-07-23 21:48:01 +08:00
dout("striped_read %llu~%llu (read %u) got %d%s%s\n", pos, left, read,
ceph: file operations File open and close operations, and read and write methods that ensure we have obtained the proper capabilities from the MDS cluster before performing IO on a file. We take references on held capabilities for the duration of the read/write to avoid prematurely releasing them back to the MDS. We implement two main paths for read and write: one that is buffered (and uses generic_aio_{read,write}), and one that is fully synchronous and blocking (operating either on a __user pointer or, if O_DIRECT, directly on user pages). Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-07 02:31:08 +08:00
ret, hit_stripe ? " HITSTRIPE" : "", was_short ? " SHORT" : "");
ceph: fix bugs about handling short-read for sync read mode. cephfs . show_layout >layyout.data_pool: 0 >layout.object_size: 4194304 >layout.stripe_unit: 4194304 >layout.stripe_count: 1 TestA: >dd if=/dev/urandom of=test bs=1M count=2 oflag=direct >dd if=/dev/urandom of=test bs=1M count=2 seek=4 oflag=direct >dd if=test of=/dev/null bs=6M count=1 iflag=direct The messages from func striped_read are: ceph: file.c:350 : striped_read 0~6291456 (read 0) got 2097152 HITSTRIPE SHORT ceph: file.c:350 : striped_read 2097152~4194304 (read 2097152) got 0 HITSTRIPE SHORT ceph: file.c:381 : zero tail 4194304 ceph: file.c:390 : striped_read returns 6291456 The hole of file is from 2M--4M.But actualy it zero the last 4M include the last 2M area which isn't a hole. Using this patch, the messages are: ceph: file.c:350 : striped_read 0~6291456 (read 0) got 2097152 HITSTRIPE SHORT ceph: file.c:358 : zero gap 2097152 to 4194304 ceph: file.c:350 : striped_read 4194304~2097152 (read 4194304) got 2097152 ceph: file.c:384 : striped_read returns 6291456 TestB: >echo majianpeng > test >dd if=test of=/dev/null bs=2M count=1 iflag=direct The messages are: ceph: file.c:350 : striped_read 0~6291456 (read 0) got 11 HITSTRIPE SHORT ceph: file.c:350 : striped_read 11~6291445 (read 11) got 0 HITSTRIPE SHORT ceph: file.c:390 : striped_read returns 11 For this case,it did once more striped_read.It's no meaningless. Using this patch, the message are: ceph: file.c:350 : striped_read 0~6291456 (read 0) got 11 HITSTRIPE SHORT ceph: file.c:384 : striped_read returns 11 Big thanks to Yan Zheng for the patch. Reviewed-by: Yan, Zheng <zheng.z.yan@intel.com> Signed-off-by: Jianpeng Ma <majianpeng@gmail.com>
2013-08-06 16:20:38 +08:00
if (ret >= 0) {
int didpages;
if (was_short && (pos + ret < inode->i_size)) {
u64 tmp = min(this_len - ret,
inode->i_size - pos - ret);
dout(" zero gap %llu to %llu\n",
pos + ret, pos + ret + tmp);
ceph_zero_page_vector_range(page_align + read + ret,
tmp, pages);
ret += tmp;
ceph: file operations File open and close operations, and read and write methods that ensure we have obtained the proper capabilities from the MDS cluster before performing IO on a file. We take references on held capabilities for the duration of the read/write to avoid prematurely releasing them back to the MDS. We implement two main paths for read and write: one that is buffered (and uses generic_aio_{read,write}), and one that is fully synchronous and blocking (operating either on a __user pointer or, if O_DIRECT, directly on user pages). Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-07 02:31:08 +08:00
}
ceph: fix bugs about handling short-read for sync read mode. cephfs . show_layout >layyout.data_pool: 0 >layout.object_size: 4194304 >layout.stripe_unit: 4194304 >layout.stripe_count: 1 TestA: >dd if=/dev/urandom of=test bs=1M count=2 oflag=direct >dd if=/dev/urandom of=test bs=1M count=2 seek=4 oflag=direct >dd if=test of=/dev/null bs=6M count=1 iflag=direct The messages from func striped_read are: ceph: file.c:350 : striped_read 0~6291456 (read 0) got 2097152 HITSTRIPE SHORT ceph: file.c:350 : striped_read 2097152~4194304 (read 2097152) got 0 HITSTRIPE SHORT ceph: file.c:381 : zero tail 4194304 ceph: file.c:390 : striped_read returns 6291456 The hole of file is from 2M--4M.But actualy it zero the last 4M include the last 2M area which isn't a hole. Using this patch, the messages are: ceph: file.c:350 : striped_read 0~6291456 (read 0) got 2097152 HITSTRIPE SHORT ceph: file.c:358 : zero gap 2097152 to 4194304 ceph: file.c:350 : striped_read 4194304~2097152 (read 4194304) got 2097152 ceph: file.c:384 : striped_read returns 6291456 TestB: >echo majianpeng > test >dd if=test of=/dev/null bs=2M count=1 iflag=direct The messages are: ceph: file.c:350 : striped_read 0~6291456 (read 0) got 11 HITSTRIPE SHORT ceph: file.c:350 : striped_read 11~6291445 (read 11) got 0 HITSTRIPE SHORT ceph: file.c:390 : striped_read returns 11 For this case,it did once more striped_read.It's no meaningless. Using this patch, the message are: ceph: file.c:350 : striped_read 0~6291456 (read 0) got 11 HITSTRIPE SHORT ceph: file.c:384 : striped_read returns 11 Big thanks to Yan Zheng for the patch. Reviewed-by: Yan, Zheng <zheng.z.yan@intel.com> Signed-off-by: Jianpeng Ma <majianpeng@gmail.com>
2013-08-06 16:20:38 +08:00
didpages = (page_align + ret) >> PAGE_CACHE_SHIFT;
ceph: file operations File open and close operations, and read and write methods that ensure we have obtained the proper capabilities from the MDS cluster before performing IO on a file. We take references on held capabilities for the duration of the read/write to avoid prematurely releasing them back to the MDS. We implement two main paths for read and write: one that is buffered (and uses generic_aio_{read,write}), and one that is fully synchronous and blocking (operating either on a __user pointer or, if O_DIRECT, directly on user pages). Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-07 02:31:08 +08:00
pos += ret;
read = pos - off;
left -= ret;
page_pos += didpages;
pages_left -= didpages;
ceph: fix bugs about handling short-read for sync read mode. cephfs . show_layout >layyout.data_pool: 0 >layout.object_size: 4194304 >layout.stripe_unit: 4194304 >layout.stripe_count: 1 TestA: >dd if=/dev/urandom of=test bs=1M count=2 oflag=direct >dd if=/dev/urandom of=test bs=1M count=2 seek=4 oflag=direct >dd if=test of=/dev/null bs=6M count=1 iflag=direct The messages from func striped_read are: ceph: file.c:350 : striped_read 0~6291456 (read 0) got 2097152 HITSTRIPE SHORT ceph: file.c:350 : striped_read 2097152~4194304 (read 2097152) got 0 HITSTRIPE SHORT ceph: file.c:381 : zero tail 4194304 ceph: file.c:390 : striped_read returns 6291456 The hole of file is from 2M--4M.But actualy it zero the last 4M include the last 2M area which isn't a hole. Using this patch, the messages are: ceph: file.c:350 : striped_read 0~6291456 (read 0) got 2097152 HITSTRIPE SHORT ceph: file.c:358 : zero gap 2097152 to 4194304 ceph: file.c:350 : striped_read 4194304~2097152 (read 4194304) got 2097152 ceph: file.c:384 : striped_read returns 6291456 TestB: >echo majianpeng > test >dd if=test of=/dev/null bs=2M count=1 iflag=direct The messages are: ceph: file.c:350 : striped_read 0~6291456 (read 0) got 11 HITSTRIPE SHORT ceph: file.c:350 : striped_read 11~6291445 (read 11) got 0 HITSTRIPE SHORT ceph: file.c:390 : striped_read returns 11 For this case,it did once more striped_read.It's no meaningless. Using this patch, the message are: ceph: file.c:350 : striped_read 0~6291456 (read 0) got 11 HITSTRIPE SHORT ceph: file.c:384 : striped_read returns 11 Big thanks to Yan Zheng for the patch. Reviewed-by: Yan, Zheng <zheng.z.yan@intel.com> Signed-off-by: Jianpeng Ma <majianpeng@gmail.com>
2013-08-06 16:20:38 +08:00
/* hit stripe and need continue*/
if (left && hit_stripe && pos < inode->i_size)
ceph: file operations File open and close operations, and read and write methods that ensure we have obtained the proper capabilities from the MDS cluster before performing IO on a file. We take references on held capabilities for the duration of the read/write to avoid prematurely releasing them back to the MDS. We implement two main paths for read and write: one that is buffered (and uses generic_aio_{read,write}), and one that is fully synchronous and blocking (operating either on a __user pointer or, if O_DIRECT, directly on user pages). Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-07 02:31:08 +08:00
goto more;
}
ceph: allow sync_read/write return partial successed size of read/write. For sync_read/write, it may do multi stripe operations.If one of those met erro, we return the former successed size rather than a error value. There is a exception for write-operation met -EOLDSNAPC.If this occur,we retry the whole write again. Signed-off-by: Jianpeng Ma <majianpeng@gmail.com>
2013-08-21 15:02:51 +08:00
if (read > 0) {
ceph: fix bugs about handling short-read for sync read mode. cephfs . show_layout >layyout.data_pool: 0 >layout.object_size: 4194304 >layout.stripe_unit: 4194304 >layout.stripe_count: 1 TestA: >dd if=/dev/urandom of=test bs=1M count=2 oflag=direct >dd if=/dev/urandom of=test bs=1M count=2 seek=4 oflag=direct >dd if=test of=/dev/null bs=6M count=1 iflag=direct The messages from func striped_read are: ceph: file.c:350 : striped_read 0~6291456 (read 0) got 2097152 HITSTRIPE SHORT ceph: file.c:350 : striped_read 2097152~4194304 (read 2097152) got 0 HITSTRIPE SHORT ceph: file.c:381 : zero tail 4194304 ceph: file.c:390 : striped_read returns 6291456 The hole of file is from 2M--4M.But actualy it zero the last 4M include the last 2M area which isn't a hole. Using this patch, the messages are: ceph: file.c:350 : striped_read 0~6291456 (read 0) got 2097152 HITSTRIPE SHORT ceph: file.c:358 : zero gap 2097152 to 4194304 ceph: file.c:350 : striped_read 4194304~2097152 (read 4194304) got 2097152 ceph: file.c:384 : striped_read returns 6291456 TestB: >echo majianpeng > test >dd if=test of=/dev/null bs=2M count=1 iflag=direct The messages are: ceph: file.c:350 : striped_read 0~6291456 (read 0) got 11 HITSTRIPE SHORT ceph: file.c:350 : striped_read 11~6291445 (read 11) got 0 HITSTRIPE SHORT ceph: file.c:390 : striped_read returns 11 For this case,it did once more striped_read.It's no meaningless. Using this patch, the message are: ceph: file.c:350 : striped_read 0~6291456 (read 0) got 11 HITSTRIPE SHORT ceph: file.c:384 : striped_read returns 11 Big thanks to Yan Zheng for the patch. Reviewed-by: Yan, Zheng <zheng.z.yan@intel.com> Signed-off-by: Jianpeng Ma <majianpeng@gmail.com>
2013-08-06 16:20:38 +08:00
ret = read;
ceph: fix short sync reads from the OSD If we get a short read from the OSD because the object is small, we need to zero the remainder of the buffer. For O_DIRECT reads, the attempted range is not trimmed to i_size by the VFS, so we were actually looping indefinitely. Fix by trimming by i_size, and the unconditionally zeroing the trailing range. Reported-by: Jeff Wu <cpwu@tnsoft.com.cn> Signed-off-by: Sage Weil <sage@newdream.net>
2011-06-02 07:08:44 +08:00
/* did we bounce off eof? */
if (pos + left > inode->i_size)
*checkeof = 1;
ceph: file operations File open and close operations, and read and write methods that ensure we have obtained the proper capabilities from the MDS cluster before performing IO on a file. We take references on held capabilities for the duration of the read/write to avoid prematurely releasing them back to the MDS. We implement two main paths for read and write: one that is buffered (and uses generic_aio_{read,write}), and one that is fully synchronous and blocking (operating either on a __user pointer or, if O_DIRECT, directly on user pages). Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-07 02:31:08 +08:00
}
dout("striped_read returns %d\n", ret);
return ret;
}
/*
* Completely synchronous read and write methods. Direct from __user
* buffer to osd, or directly to user pages (if O_DIRECT).
*
* If the read spans object boundary, just do multiple reads.
*/
static ssize_t ceph_sync_read(struct file *file, char __user *data,
ceph: fix sync read eof check deadlock If a sync read gets a short result from the OSD, it may need to do a getattr to see if it is short due to reaching end-of-file. The getattr was being done while holding a reference to FILE_RD, which can lead to a deadlock if the MDS is revoking that capability bit and can't process the getattr until it does. We fix this by setting a flag if EOF size validation is needed, and doing the getattr in ceph_aio_read, after the RD cap ref is dropped. If the read needs to be continued, we loop and continue traversing the file. Signed-off-by: Sage Weil <sage@newdream.net>
2010-02-10 06:04:02 +08:00
unsigned len, loff_t *poff, int *checkeof)
ceph: file operations File open and close operations, and read and write methods that ensure we have obtained the proper capabilities from the MDS cluster before performing IO on a file. We take references on held capabilities for the duration of the read/write to avoid prematurely releasing them back to the MDS. We implement two main paths for read and write: one that is buffered (and uses generic_aio_{read,write}), and one that is fully synchronous and blocking (operating either on a __user pointer or, if O_DIRECT, directly on user pages). Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-07 02:31:08 +08:00
{
new helper: file_inode(file) Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-01-24 06:07:38 +08:00
struct inode *inode = file_inode(file);
ceph: file operations File open and close operations, and read and write methods that ensure we have obtained the proper capabilities from the MDS cluster before performing IO on a file. We take references on held capabilities for the duration of the read/write to avoid prematurely releasing them back to the MDS. We implement two main paths for read and write: one that is buffered (and uses generic_aio_{read,write}), and one that is fully synchronous and blocking (operating either on a __user pointer or, if O_DIRECT, directly on user pages). Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-07 02:31:08 +08:00
struct page **pages;
u64 off = *poff;
ceph: fix direct-io on non-page-aligned buffers The user buffer may be 512-byte aligned, not page-aligned. We were assuming the buffer was page-aligned and only accounting for non-page-aligned io offsets. Signed-off-by: Henry C Chang <henry_c_chang@tcloudcomputing.com> Signed-off-by: Sage Weil <sage@newdream.net>
2010-12-16 12:41:54 +08:00
int num_pages, ret;
ceph: file operations File open and close operations, and read and write methods that ensure we have obtained the proper capabilities from the MDS cluster before performing IO on a file. We take references on held capabilities for the duration of the read/write to avoid prematurely releasing them back to the MDS. We implement two main paths for read and write: one that is buffered (and uses generic_aio_{read,write}), and one that is fully synchronous and blocking (operating either on a __user pointer or, if O_DIRECT, directly on user pages). Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-07 02:31:08 +08:00
dout("sync_read on file %p %llu~%u %s\n", file, off, len,
(file->f_flags & O_DIRECT) ? "O_DIRECT" : "");
ceph: fix direct-io on non-page-aligned buffers The user buffer may be 512-byte aligned, not page-aligned. We were assuming the buffer was page-aligned and only accounting for non-page-aligned io offsets. Signed-off-by: Henry C Chang <henry_c_chang@tcloudcomputing.com> Signed-off-by: Sage Weil <sage@newdream.net>
2010-12-16 12:41:54 +08:00
if (file->f_flags & O_DIRECT) {
num_pages = calc_pages_for((unsigned long)data, len);
ceph: mark user pages dirty on direct-io reads For read operation, we have to set the argument _write_ of get_user_pages to 1 since we will write data to pages. Also, we need to SetPageDirty before releasing these pages. Signed-off-by: Henry C Chang <henry_c_chang@tcloudcomputing.com> Signed-off-by: Sage Weil <sage@newdream.net>
2010-12-16 12:45:41 +08:00
pages = ceph_get_direct_page_vector(data, num_pages, true);
ceph: fix direct-io on non-page-aligned buffers The user buffer may be 512-byte aligned, not page-aligned. We were assuming the buffer was page-aligned and only accounting for non-page-aligned io offsets. Signed-off-by: Henry C Chang <henry_c_chang@tcloudcomputing.com> Signed-off-by: Sage Weil <sage@newdream.net>
2010-12-16 12:41:54 +08:00
} else {
num_pages = calc_pages_for(off, len);
ceph: all allocation functions should get gfp_mask This is essential, as for the rados block device we'll need to run in different contexts that would need flags that are other than GFP_NOFS. Signed-off-by: Yehuda Sadeh <yehuda@hq.newdream.net> Signed-off-by: Sage Weil <sage@newdream.net>
2010-04-07 05:33:58 +08:00
pages = ceph_alloc_page_vector(num_pages, GFP_NOFS);
ceph: fix direct-io on non-page-aligned buffers The user buffer may be 512-byte aligned, not page-aligned. We were assuming the buffer was page-aligned and only accounting for non-page-aligned io offsets. Signed-off-by: Henry C Chang <henry_c_chang@tcloudcomputing.com> Signed-off-by: Sage Weil <sage@newdream.net>
2010-12-16 12:41:54 +08:00
}
ceph: file operations File open and close operations, and read and write methods that ensure we have obtained the proper capabilities from the MDS cluster before performing IO on a file. We take references on held capabilities for the duration of the read/write to avoid prematurely releasing them back to the MDS. We implement two main paths for read and write: one that is buffered (and uses generic_aio_{read,write}), and one that is fully synchronous and blocking (operating either on a __user pointer or, if O_DIRECT, directly on user pages). Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-07 02:31:08 +08:00
if (IS_ERR(pages))
return PTR_ERR(pages);
ceph: fix comment, remove extraneous args The offset/length arguments aren't used. Signed-off-by: Sage Weil <sage@newdream.net>
2010-11-10 04:24:53 +08:00
/*
* flush any page cache pages in this range. this
* will make concurrent normal and sync io slow,
* but it will at least behave sensibly when they are
* in sequence.
*/
ceph: sync read/write considers page cache In the cases where we either do a sync read or a write, we need to make sure that everything in the page cache is flushed. In the case of a sync write we invalidate the relevant pages, so that subsequent read/write reflects the new data written. Signed-off-by: Yehuda Sadeh <yehuda@hq.newdream.net> Signed-off-by: Sage Weil <sage@newdream.net>
2010-02-10 03:14:41 +08:00
ret = filemap_write_and_wait(inode->i_mapping);
if (ret < 0)
goto done;
ceph: make page alignment explicit in osd interface We used to infer alignment of IOs within a page based on the file offset, which assumed they matched. This broke with direct IO that was not aligned to pages (e.g., 512-byte aligned IO). We were also trusting the alignment specified in the OSD reply, which could have been adjusted by the server. Explicitly specify the page alignment when setting up OSD IO requests. Signed-off-by: Sage Weil <sage@newdream.net>
2010-11-10 04:43:12 +08:00
ret = striped_read(inode, off, len, pages, num_pages, checkeof,
ceph: fix direct-io on non-page-aligned buffers The user buffer may be 512-byte aligned, not page-aligned. We were assuming the buffer was page-aligned and only accounting for non-page-aligned io offsets. Signed-off-by: Henry C Chang <henry_c_chang@tcloudcomputing.com> Signed-off-by: Sage Weil <sage@newdream.net>
2010-12-16 12:41:54 +08:00
file->f_flags & O_DIRECT,
(unsigned long)data & ~PAGE_MASK);
ceph: file operations File open and close operations, and read and write methods that ensure we have obtained the proper capabilities from the MDS cluster before performing IO on a file. We take references on held capabilities for the duration of the read/write to avoid prematurely releasing them back to the MDS. We implement two main paths for read and write: one that is buffered (and uses generic_aio_{read,write}), and one that is fully synchronous and blocking (operating either on a __user pointer or, if O_DIRECT, directly on user pages). Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-07 02:31:08 +08:00
if (ret >= 0 && (file->f_flags & O_DIRECT) == 0)
ceph: factor out libceph from Ceph file system This factors out protocol and low-level storage parts of ceph into a separate libceph module living in net/ceph and include/linux/ceph. This is mostly a matter of moving files around. However, a few key pieces of the interface change as well: - ceph_client becomes ceph_fs_client and ceph_client, where the latter captures the mon and osd clients, and the fs_client gets the mds client and file system specific pieces. - Mount option parsing and debugfs setup is correspondingly broken into two pieces. - The mon client gets a generic handler callback for otherwise unknown messages (mds map, in this case). - The basic supported/required feature bits can be expanded (and are by ceph_fs_client). No functional change, aside from some subtle error handling cases that got cleaned up in the refactoring process. Signed-off-by: Sage Weil <sage@newdream.net>
2010-04-07 06:14:15 +08:00
ret = ceph_copy_page_vector_to_user(pages, data, off, ret);
ceph: file operations File open and close operations, and read and write methods that ensure we have obtained the proper capabilities from the MDS cluster before performing IO on a file. We take references on held capabilities for the duration of the read/write to avoid prematurely releasing them back to the MDS. We implement two main paths for read and write: one that is buffered (and uses generic_aio_{read,write}), and one that is fully synchronous and blocking (operating either on a __user pointer or, if O_DIRECT, directly on user pages). Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-07 02:31:08 +08:00
if (ret >= 0)
*poff = off + ret;
ceph: sync read/write considers page cache In the cases where we either do a sync read or a write, we need to make sure that everything in the page cache is flushed. In the case of a sync write we invalidate the relevant pages, so that subsequent read/write reflects the new data written. Signed-off-by: Yehuda Sadeh <yehuda@hq.newdream.net> Signed-off-by: Sage Weil <sage@newdream.net>
2010-02-10 03:14:41 +08:00
done:
ceph: file operations File open and close operations, and read and write methods that ensure we have obtained the proper capabilities from the MDS cluster before performing IO on a file. We take references on held capabilities for the duration of the read/write to avoid prematurely releasing them back to the MDS. We implement two main paths for read and write: one that is buffered (and uses generic_aio_{read,write}), and one that is fully synchronous and blocking (operating either on a __user pointer or, if O_DIRECT, directly on user pages). Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-07 02:31:08 +08:00
if (file->f_flags & O_DIRECT)
ceph: mark user pages dirty on direct-io reads For read operation, we have to set the argument _write_ of get_user_pages to 1 since we will write data to pages. Also, we need to SetPageDirty before releasing these pages. Signed-off-by: Henry C Chang <henry_c_chang@tcloudcomputing.com> Signed-off-by: Sage Weil <sage@newdream.net>
2010-12-16 12:45:41 +08:00
ceph_put_page_vector(pages, num_pages, true);
ceph: file operations File open and close operations, and read and write methods that ensure we have obtained the proper capabilities from the MDS cluster before performing IO on a file. We take references on held capabilities for the duration of the read/write to avoid prematurely releasing them back to the MDS. We implement two main paths for read and write: one that is buffered (and uses generic_aio_{read,write}), and one that is fully synchronous and blocking (operating either on a __user pointer or, if O_DIRECT, directly on user pages). Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-07 02:31:08 +08:00
else
ceph_release_page_vector(pages, num_pages);
dout("sync_read result %d\n", ret);
return ret;
}
/*
libceph: change how "safe" callback is used An osd request currently has two callbacks. They inform the initiator of the request when we've received confirmation for the target osd that a request was received, and when the osd indicates all changes described by the request are durable. The only time the second callback is used is in the ceph file system for a synchronous write. There's a race that makes some handling of this case unsafe. This patch addresses this problem. The error handling for this callback is also kind of gross, and this patch changes that as well. In ceph_sync_write(), if a safe callback is requested we want to add the request on the ceph inode's unsafe items list. Because items on this list must have their tid set (by ceph_osd_start_request()), the request added *after* the call to that function returns. The problem with this is that there's a race between starting the request and adding it to the unsafe items list; the request may already be complete before ceph_sync_write() even begins to put it on the list. To address this, we change the way the "safe" callback is used. Rather than just calling it when the request is "safe", we use it to notify the initiator the bounds (start and end) of the period during which the request is *unsafe*. So the initiator gets notified just before the request gets sent to the osd (when it is "unsafe"), and again when it's known the results are durable (it's no longer unsafe). The first call will get made in __send_request(), just before the request message gets sent to the messenger for the first time. That function is only called by __send_queued(), which is always called with the osd client's request mutex held. We then have this callback function insert the request on the ceph inode's unsafe list when we're told the request is unsafe. This will avoid the race because this call will be made under protection of the osd client's request mutex. It also nicely groups the setup and cleanup of the state associated with managing unsafe requests. The name of the "safe" callback field is changed to "unsafe" to better reflect its new purpose. It has a Boolean "unsafe" parameter to indicate whether the request is becoming unsafe or is now safe. Because the "msg" parameter wasn't used, we drop that. This resolves the original problem reportedin: http://tracker.ceph.com/issues/4706 Reported-by: Yan, Zheng <zheng.z.yan@intel.com> Signed-off-by: Alex Elder <elder@inktank.com> Reviewed-by: Yan, Zheng <zheng.z.yan@intel.com> Reviewed-by: Sage Weil <sage@inktank.com>
2013-04-16 00:20:42 +08:00
* Write commit request unsafe callback, called to tell us when a
* request is unsafe (that is, in flight--has been handed to the
* messenger to send to its target osd). It is called again when
* we've received a response message indicating the request is
* "safe" (its CEPH_OSD_FLAG_ONDISK flag is set), or when a request
* is completed early (and unsuccessfully) due to a timeout or
* interrupt.
*
* This is used if we requested both an ACK and ONDISK commit reply
* from the OSD.
ceph: file operations File open and close operations, and read and write methods that ensure we have obtained the proper capabilities from the MDS cluster before performing IO on a file. We take references on held capabilities for the duration of the read/write to avoid prematurely releasing them back to the MDS. We implement two main paths for read and write: one that is buffered (and uses generic_aio_{read,write}), and one that is fully synchronous and blocking (operating either on a __user pointer or, if O_DIRECT, directly on user pages). Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-07 02:31:08 +08:00
*/
libceph: change how "safe" callback is used An osd request currently has two callbacks. They inform the initiator of the request when we've received confirmation for the target osd that a request was received, and when the osd indicates all changes described by the request are durable. The only time the second callback is used is in the ceph file system for a synchronous write. There's a race that makes some handling of this case unsafe. This patch addresses this problem. The error handling for this callback is also kind of gross, and this patch changes that as well. In ceph_sync_write(), if a safe callback is requested we want to add the request on the ceph inode's unsafe items list. Because items on this list must have their tid set (by ceph_osd_start_request()), the request added *after* the call to that function returns. The problem with this is that there's a race between starting the request and adding it to the unsafe items list; the request may already be complete before ceph_sync_write() even begins to put it on the list. To address this, we change the way the "safe" callback is used. Rather than just calling it when the request is "safe", we use it to notify the initiator the bounds (start and end) of the period during which the request is *unsafe*. So the initiator gets notified just before the request gets sent to the osd (when it is "unsafe"), and again when it's known the results are durable (it's no longer unsafe). The first call will get made in __send_request(), just before the request message gets sent to the messenger for the first time. That function is only called by __send_queued(), which is always called with the osd client's request mutex held. We then have this callback function insert the request on the ceph inode's unsafe list when we're told the request is unsafe. This will avoid the race because this call will be made under protection of the osd client's request mutex. It also nicely groups the setup and cleanup of the state associated with managing unsafe requests. The name of the "safe" callback field is changed to "unsafe" to better reflect its new purpose. It has a Boolean "unsafe" parameter to indicate whether the request is becoming unsafe or is now safe. Because the "msg" parameter wasn't used, we drop that. This resolves the original problem reportedin: http://tracker.ceph.com/issues/4706 Reported-by: Yan, Zheng <zheng.z.yan@intel.com> Signed-off-by: Alex Elder <elder@inktank.com> Reviewed-by: Yan, Zheng <zheng.z.yan@intel.com> Reviewed-by: Sage Weil <sage@inktank.com>
2013-04-16 00:20:42 +08:00
static void ceph_sync_write_unsafe(struct ceph_osd_request *req, bool unsafe)
ceph: file operations File open and close operations, and read and write methods that ensure we have obtained the proper capabilities from the MDS cluster before performing IO on a file. We take references on held capabilities for the duration of the read/write to avoid prematurely releasing them back to the MDS. We implement two main paths for read and write: one that is buffered (and uses generic_aio_{read,write}), and one that is fully synchronous and blocking (operating either on a __user pointer or, if O_DIRECT, directly on user pages). Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-07 02:31:08 +08:00
{
struct ceph_inode_info *ci = ceph_inode(req->r_inode);
libceph: change how "safe" callback is used An osd request currently has two callbacks. They inform the initiator of the request when we've received confirmation for the target osd that a request was received, and when the osd indicates all changes described by the request are durable. The only time the second callback is used is in the ceph file system for a synchronous write. There's a race that makes some handling of this case unsafe. This patch addresses this problem. The error handling for this callback is also kind of gross, and this patch changes that as well. In ceph_sync_write(), if a safe callback is requested we want to add the request on the ceph inode's unsafe items list. Because items on this list must have their tid set (by ceph_osd_start_request()), the request added *after* the call to that function returns. The problem with this is that there's a race between starting the request and adding it to the unsafe items list; the request may already be complete before ceph_sync_write() even begins to put it on the list. To address this, we change the way the "safe" callback is used. Rather than just calling it when the request is "safe", we use it to notify the initiator the bounds (start and end) of the period during which the request is *unsafe*. So the initiator gets notified just before the request gets sent to the osd (when it is "unsafe"), and again when it's known the results are durable (it's no longer unsafe). The first call will get made in __send_request(), just before the request message gets sent to the messenger for the first time. That function is only called by __send_queued(), which is always called with the osd client's request mutex held. We then have this callback function insert the request on the ceph inode's unsafe list when we're told the request is unsafe. This will avoid the race because this call will be made under protection of the osd client's request mutex. It also nicely groups the setup and cleanup of the state associated with managing unsafe requests. The name of the "safe" callback field is changed to "unsafe" to better reflect its new purpose. It has a Boolean "unsafe" parameter to indicate whether the request is becoming unsafe or is now safe. Because the "msg" parameter wasn't used, we drop that. This resolves the original problem reportedin: http://tracker.ceph.com/issues/4706 Reported-by: Yan, Zheng <zheng.z.yan@intel.com> Signed-off-by: Alex Elder <elder@inktank.com> Reviewed-by: Yan, Zheng <zheng.z.yan@intel.com> Reviewed-by: Sage Weil <sage@inktank.com>
2013-04-16 00:20:42 +08:00
dout("%s %p tid %llu %ssafe\n", __func__, req, req->r_tid,
unsafe ? "un" : "");
if (unsafe) {
ceph_get_cap_refs(ci, CEPH_CAP_FILE_WR);
spin_lock(&ci->i_unsafe_lock);
list_add_tail(&req->r_unsafe_item,
&ci->i_unsafe_writes);
spin_unlock(&ci->i_unsafe_lock);
} else {
spin_lock(&ci->i_unsafe_lock);
list_del_init(&req->r_unsafe_item);
spin_unlock(&ci->i_unsafe_lock);
ceph_put_cap_refs(ci, CEPH_CAP_FILE_WR);
}
ceph: file operations File open and close operations, and read and write methods that ensure we have obtained the proper capabilities from the MDS cluster before performing IO on a file. We take references on held capabilities for the duration of the read/write to avoid prematurely releasing them back to the MDS. We implement two main paths for read and write: one that is buffered (and uses generic_aio_{read,write}), and one that is fully synchronous and blocking (operating either on a __user pointer or, if O_DIRECT, directly on user pages). Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-07 02:31:08 +08:00
}
/*
* Synchronous write, straight from __user pointer or user pages (if
* O_DIRECT).
*
* If write spans object boundary, just do multiple writes. (For a
* correct atomic write, we should e.g. take write locks on all
* objects, rollback on failure, etc.)
*/
static ssize_t ceph_sync_write(struct file *file, const char __user *data,
ceph: apply write checks in ceph_aio_write copy write checks in __generic_file_aio_write to ceph_aio_write. To make these checks cover sync write path. Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com> Reviewed-by: Alex Elder <elder@inktank.com>
2013-04-12 16:11:13 +08:00
size_t left, loff_t pos, loff_t *ppos)
ceph: file operations File open and close operations, and read and write methods that ensure we have obtained the proper capabilities from the MDS cluster before performing IO on a file. We take references on held capabilities for the duration of the read/write to avoid prematurely releasing them back to the MDS. We implement two main paths for read and write: one that is buffered (and uses generic_aio_{read,write}), and one that is fully synchronous and blocking (operating either on a __user pointer or, if O_DIRECT, directly on user pages). Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-07 02:31:08 +08:00
{
new helper: file_inode(file) Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-01-24 06:07:38 +08:00
struct inode *inode = file_inode(file);
ceph: file operations File open and close operations, and read and write methods that ensure we have obtained the proper capabilities from the MDS cluster before performing IO on a file. We take references on held capabilities for the duration of the read/write to avoid prematurely releasing them back to the MDS. We implement two main paths for read and write: one that is buffered (and uses generic_aio_{read,write}), and one that is fully synchronous and blocking (operating either on a __user pointer or, if O_DIRECT, directly on user pages). Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-07 02:31:08 +08:00
struct ceph_inode_info *ci = ceph_inode(inode);
ceph: factor out libceph from Ceph file system This factors out protocol and low-level storage parts of ceph into a separate libceph module living in net/ceph and include/linux/ceph. This is mostly a matter of moving files around. However, a few key pieces of the interface change as well: - ceph_client becomes ceph_fs_client and ceph_client, where the latter captures the mon and osd clients, and the fs_client gets the mds client and file system specific pieces. - Mount option parsing and debugfs setup is correspondingly broken into two pieces. - The mon client gets a generic handler callback for otherwise unknown messages (mds map, in this case). - The basic supported/required feature bits can be expanded (and are by ceph_fs_client). No functional change, aside from some subtle error handling cases that got cleaned up in the refactoring process. Signed-off-by: Sage Weil <sage@newdream.net>
2010-04-07 06:14:15 +08:00
struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
libceph: don't build request in ceph_osdc_new_request() This patch moves the call to ceph_osdc_build_request() out of ceph_osdc_new_request() and into its caller. This is in order to defer formatting osd operation information into the request message until just before request is started. The only unusual (ab)user of ceph_osdc_build_request() is ceph_writepages_start(), where the final length of write request may change (downward) based on the current inode size or the oldest snapshot context with dirty data for the inode. The remaining callers don't change anything in the request after has been built. This means the ops array is now supplied by the caller. It also means there is no need to pass the mtime to ceph_osdc_new_request() (it gets provided to ceph_osdc_build_request()). And rather than passing a do_sync flag, have the number of ops in the ops array supplied imply adding a second STARTSYNC operation after the READ or WRITE requested. This and some of the patches that follow are related to having the messenger (only) be responsible for filling the content of the message header, as described here: http://tracker.ceph.com/issues/4589 Signed-off-by: Alex Elder <elder@inktank.com> Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
2013-03-15 03:09:05 +08:00
struct ceph_snap_context *snapc;
struct ceph_vino vino;
ceph: file operations File open and close operations, and read and write methods that ensure we have obtained the proper capabilities from the MDS cluster before performing IO on a file. We take references on held capabilities for the duration of the read/write to avoid prematurely releasing them back to the MDS. We implement two main paths for read and write: one that is buffered (and uses generic_aio_{read,write}), and one that is fully synchronous and blocking (operating either on a __user pointer or, if O_DIRECT, directly on user pages). Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-07 02:31:08 +08:00
struct ceph_osd_request *req;
libceph: don't build request in ceph_osdc_new_request() This patch moves the call to ceph_osdc_build_request() out of ceph_osdc_new_request() and into its caller. This is in order to defer formatting osd operation information into the request message until just before request is started. The only unusual (ab)user of ceph_osdc_build_request() is ceph_writepages_start(), where the final length of write request may change (downward) based on the current inode size or the oldest snapshot context with dirty data for the inode. The remaining callers don't change anything in the request after has been built. This means the ops array is now supplied by the caller. It also means there is no need to pass the mtime to ceph_osdc_new_request() (it gets provided to ceph_osdc_build_request()). And rather than passing a do_sync flag, have the number of ops in the ops array supplied imply adding a second STARTSYNC operation after the READ or WRITE requested. This and some of the patches that follow are related to having the messenger (only) be responsible for filling the content of the message header, as described here: http://tracker.ceph.com/issues/4589 Signed-off-by: Alex Elder <elder@inktank.com> Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
2013-03-15 03:09:05 +08:00
int num_ops = 1;
ceph: file operations File open and close operations, and read and write methods that ensure we have obtained the proper capabilities from the MDS cluster before performing IO on a file. We take references on held capabilities for the duration of the read/write to avoid prematurely releasing them back to the MDS. We implement two main paths for read and write: one that is buffered (and uses generic_aio_{read,write}), and one that is fully synchronous and blocking (operating either on a __user pointer or, if O_DIRECT, directly on user pages). Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-07 02:31:08 +08:00
struct page **pages;
int num_pages;
u64 len;
int written = 0;
int flags;
int check_caps = 0;
ceph: make page alignment explicit in osd interface We used to infer alignment of IOs within a page based on the file offset, which assumed they matched. This broke with direct IO that was not aligned to pages (e.g., 512-byte aligned IO). We were also trusting the alignment specified in the OSD reply, which could have been adjusted by the server. Explicitly specify the page alignment when setting up OSD IO requests. Signed-off-by: Sage Weil <sage@newdream.net>
2010-11-10 04:43:12 +08:00
int page_align, io_align;
ceph: fix direct-io on non-page-aligned buffers The user buffer may be 512-byte aligned, not page-aligned. We were assuming the buffer was page-aligned and only accounting for non-page-aligned io offsets. Signed-off-by: Henry C Chang <henry_c_chang@tcloudcomputing.com> Signed-off-by: Sage Weil <sage@newdream.net>
2010-12-16 12:41:54 +08:00
unsigned long buf_align;
ceph: file operations File open and close operations, and read and write methods that ensure we have obtained the proper capabilities from the MDS cluster before performing IO on a file. We take references on held capabilities for the duration of the read/write to avoid prematurely releasing them back to the MDS. We implement two main paths for read and write: one that is buffered (and uses generic_aio_{read,write}), and one that is fully synchronous and blocking (operating either on a __user pointer or, if O_DIRECT, directly on user pages). Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-07 02:31:08 +08:00
int ret;
struct timespec mtime = CURRENT_TIME;
libceph: define osd data initialization helpers Define and use functions that encapsulate the initializion of a ceph_osd_data structure. Signed-off-by: Alex Elder <elder@inktank.com> Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
2013-04-03 14:28:57 +08:00
bool own_pages = false;
ceph: file operations File open and close operations, and read and write methods that ensure we have obtained the proper capabilities from the MDS cluster before performing IO on a file. We take references on held capabilities for the duration of the read/write to avoid prematurely releasing them back to the MDS. We implement two main paths for read and write: one that is buffered (and uses generic_aio_{read,write}), and one that is fully synchronous and blocking (operating either on a __user pointer or, if O_DIRECT, directly on user pages). Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-07 02:31:08 +08:00
new helper: file_inode(file) Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-01-24 06:07:38 +08:00
if (ceph_snap(file_inode(file)) != CEPH_NOSNAP)
ceph: file operations File open and close operations, and read and write methods that ensure we have obtained the proper capabilities from the MDS cluster before performing IO on a file. We take references on held capabilities for the duration of the read/write to avoid prematurely releasing them back to the MDS. We implement two main paths for read and write: one that is buffered (and uses generic_aio_{read,write}), and one that is fully synchronous and blocking (operating either on a __user pointer or, if O_DIRECT, directly on user pages). Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-07 02:31:08 +08:00
return -EROFS;
ceph: apply write checks in ceph_aio_write copy write checks in __generic_file_aio_write to ceph_aio_write. To make these checks cover sync write path. Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com> Reviewed-by: Alex Elder <elder@inktank.com>
2013-04-12 16:11:13 +08:00
dout("sync_write on file %p %lld~%u %s\n", file, pos,
ceph: file operations File open and close operations, and read and write methods that ensure we have obtained the proper capabilities from the MDS cluster before performing IO on a file. We take references on held capabilities for the duration of the read/write to avoid prematurely releasing them back to the MDS. We implement two main paths for read and write: one that is buffered (and uses generic_aio_{read,write}), and one that is fully synchronous and blocking (operating either on a __user pointer or, if O_DIRECT, directly on user pages). Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-07 02:31:08 +08:00
(unsigned)left, (file->f_flags & O_DIRECT) ? "O_DIRECT" : "");
ceph: sync read/write considers page cache In the cases where we either do a sync read or a write, we need to make sure that everything in the page cache is flushed. In the case of a sync write we invalidate the relevant pages, so that subsequent read/write reflects the new data written. Signed-off-by: Yehuda Sadeh <yehuda@hq.newdream.net> Signed-off-by: Sage Weil <sage@newdream.net>
2010-02-10 03:14:41 +08:00
ret = filemap_write_and_wait_range(inode->i_mapping, pos, pos + left);
if (ret < 0)
return ret;
ret = invalidate_inode_pages2_range(inode->i_mapping,
pos >> PAGE_CACHE_SHIFT,
(pos + left) >> PAGE_CACHE_SHIFT);
if (ret < 0)
dout("invalidate_inode_pages2_range returned %d\n", ret);
ceph: file operations File open and close operations, and read and write methods that ensure we have obtained the proper capabilities from the MDS cluster before performing IO on a file. We take references on held capabilities for the duration of the read/write to avoid prematurely releasing them back to the MDS. We implement two main paths for read and write: one that is buffered (and uses generic_aio_{read,write}), and one that is fully synchronous and blocking (operating either on a __user pointer or, if O_DIRECT, directly on user pages). Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-07 02:31:08 +08:00
flags = CEPH_OSD_FLAG_ORDERSNAP |
CEPH_OSD_FLAG_ONDISK |
CEPH_OSD_FLAG_WRITE;
if ((file->f_flags & (O_SYNC|O_DIRECT)) == 0)
flags |= CEPH_OSD_FLAG_ACK;
else
libceph: don't build request in ceph_osdc_new_request() This patch moves the call to ceph_osdc_build_request() out of ceph_osdc_new_request() and into its caller. This is in order to defer formatting osd operation information into the request message until just before request is started. The only unusual (ab)user of ceph_osdc_build_request() is ceph_writepages_start(), where the final length of write request may change (downward) based on the current inode size or the oldest snapshot context with dirty data for the inode. The remaining callers don't change anything in the request after has been built. This means the ops array is now supplied by the caller. It also means there is no need to pass the mtime to ceph_osdc_new_request() (it gets provided to ceph_osdc_build_request()). And rather than passing a do_sync flag, have the number of ops in the ops array supplied imply adding a second STARTSYNC operation after the READ or WRITE requested. This and some of the patches that follow are related to having the messenger (only) be responsible for filling the content of the message header, as described here: http://tracker.ceph.com/issues/4589 Signed-off-by: Alex Elder <elder@inktank.com> Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
2013-03-15 03:09:05 +08:00
num_ops++; /* Also include a 'startsync' command. */
ceph: file operations File open and close operations, and read and write methods that ensure we have obtained the proper capabilities from the MDS cluster before performing IO on a file. We take references on held capabilities for the duration of the read/write to avoid prematurely releasing them back to the MDS. We implement two main paths for read and write: one that is buffered (and uses generic_aio_{read,write}), and one that is fully synchronous and blocking (operating either on a __user pointer or, if O_DIRECT, directly on user pages). Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-07 02:31:08 +08:00
/*
* we may need to do multiple writes here if we span an object
* boundary. this isn't atomic, unfortunately. :(
*/
more:
ceph: fix sync and dio writes across stripe boundaries We were iterating across stripe boundaries properly, but not moving the write buffer pointer forward. This caused us to rewrite the same data after the break. Fix by adjusting the data pointer forward, and recalculating the io and buffer alignment after the break. Signed-off-by: Sage Weil <sage@newdream.net>
2011-06-14 07:22:18 +08:00
io_align = pos & ~PAGE_MASK;
buf_align = (unsigned long)data & ~PAGE_MASK;
ceph: file operations File open and close operations, and read and write methods that ensure we have obtained the proper capabilities from the MDS cluster before performing IO on a file. We take references on held capabilities for the duration of the read/write to avoid prematurely releasing them back to the MDS. We implement two main paths for read and write: one that is buffered (and uses generic_aio_{read,write}), and one that is fully synchronous and blocking (operating either on a __user pointer or, if O_DIRECT, directly on user pages). Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-07 02:31:08 +08:00
len = left;
ceph: simplify ceph_sync_write() page_align calculation (This is being reposted. The first one had a problem because it erroneously added a similar change elsewhere; that change has been dropped.) The next patch in this series points out that the calculation for the number of pages in an osd request is getting done twice. It is not obvious, but the result of both calculations is identical. This patch simplifies one of them--as a separate step--to make it clear that the transformation in the next patch is valid. In ceph_sync_write() there is some magic that computes page_align for an osd request. But a little analysis shows it can be simplified. First, we have: io_align = pos & ~PAGE_MASK; which is used here: page_align = (pos - io_align + buf_align) & ~PAGE_MASK; Note (pos - io_align) simply rounds "pos" down to the nearest multiple of the page size. We also have: buf_align = (unsigned long)data & ~PAGE_MASK; Adding buf_align to that rounded-down "pos" value will stay within the same page; the result will just be offset by the page offset for the "data" pointer. The final mask therefore leaves just the value of "buf_align". One more simplification. Note that the result of calc_pages_for() is invariant of which page the offset starts in--the only thing that matters is the offset within the starting page. We will have put the proper page offset to use into "page_align", so just use that in calculating num_pages. This resolves: http://tracker.ceph.com/issues/4166 Signed-off-by: Alex Elder <elder@inktank.com> Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
2013-02-17 01:07:32 +08:00
libceph: don't build request in ceph_osdc_new_request() This patch moves the call to ceph_osdc_build_request() out of ceph_osdc_new_request() and into its caller. This is in order to defer formatting osd operation information into the request message until just before request is started. The only unusual (ab)user of ceph_osdc_build_request() is ceph_writepages_start(), where the final length of write request may change (downward) based on the current inode size or the oldest snapshot context with dirty data for the inode. The remaining callers don't change anything in the request after has been built. This means the ops array is now supplied by the caller. It also means there is no need to pass the mtime to ceph_osdc_new_request() (it gets provided to ceph_osdc_build_request()). And rather than passing a do_sync flag, have the number of ops in the ops array supplied imply adding a second STARTSYNC operation after the READ or WRITE requested. This and some of the patches that follow are related to having the messenger (only) be responsible for filling the content of the message header, as described here: http://tracker.ceph.com/issues/4589 Signed-off-by: Alex Elder <elder@inktank.com> Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
2013-03-15 03:09:05 +08:00
snapc = ci->i_snap_realm->cached_context;
vino = ceph_vino(inode);
ceph: factor out libceph from Ceph file system This factors out protocol and low-level storage parts of ceph into a separate libceph module living in net/ceph and include/linux/ceph. This is mostly a matter of moving files around. However, a few key pieces of the interface change as well: - ceph_client becomes ceph_fs_client and ceph_client, where the latter captures the mon and osd clients, and the fs_client gets the mds client and file system specific pieces. - Mount option parsing and debugfs setup is correspondingly broken into two pieces. - The mon client gets a generic handler callback for otherwise unknown messages (mds map, in this case). - The basic supported/required feature bits can be expanded (and are by ceph_fs_client). No functional change, aside from some subtle error handling cases that got cleaned up in the refactoring process. Signed-off-by: Sage Weil <sage@newdream.net>
2010-04-07 06:14:15 +08:00
req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
libceph: keep source rather than message osd op array An osd request keeps a pointer to the osd operations (ops) array that it builds in its request message. In order to allow each op in the array to have its own distinct data, we will need to keep track of each op's data, and that information does not go over the wire. As long as we're tracking the data we might as well just track the entire (source) op definition for each of the ops. And if we're doing that, we'll have no more need to keep a pointer to the wire-encoded version. This patch makes the array of source ops be kept with the osd request structure, and uses that instead of the version encoded in the message in places where that was previously used. The array will be embedded in the request structure, and the maximum number of ops we ever actually use is currently 2. So reduce CEPH_OSD_MAX_OP to 2 to reduce the size of the structure. The result of doing this sort of ripples back up, and as a result various function parameters and local variables become unnecessary. Make r_num_ops be unsigned, and move the definition of struct ceph_osd_req_op earlier to ensure it's defined where needed. It does not yet add per-op data, that's coming soon. This resolves: http://tracker.ceph.com/issues/4656 Signed-off-by: Alex Elder <elder@inktank.com> Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
2013-04-04 10:32:51 +08:00
vino, pos, &len, num_ops,
libceph: don't build request in ceph_osdc_new_request() This patch moves the call to ceph_osdc_build_request() out of ceph_osdc_new_request() and into its caller. This is in order to defer formatting osd operation information into the request message until just before request is started. The only unusual (ab)user of ceph_osdc_build_request() is ceph_writepages_start(), where the final length of write request may change (downward) based on the current inode size or the oldest snapshot context with dirty data for the inode. The remaining callers don't change anything in the request after has been built. This means the ops array is now supplied by the caller. It also means there is no need to pass the mtime to ceph_osdc_new_request() (it gets provided to ceph_osdc_build_request()). And rather than passing a do_sync flag, have the number of ops in the ops array supplied imply adding a second STARTSYNC operation after the READ or WRITE requested. This and some of the patches that follow are related to having the messenger (only) be responsible for filling the content of the message header, as described here: http://tracker.ceph.com/issues/4589 Signed-off-by: Alex Elder <elder@inktank.com> Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
2013-03-15 03:09:05 +08:00
CEPH_OSD_OP_WRITE, flags, snapc,
ceph: file operations File open and close operations, and read and write methods that ensure we have obtained the proper capabilities from the MDS cluster before performing IO on a file. We take references on held capabilities for the duration of the read/write to avoid prematurely releasing them back to the MDS. We implement two main paths for read and write: one that is buffered (and uses generic_aio_{read,write}), and one that is fully synchronous and blocking (operating either on a __user pointer or, if O_DIRECT, directly on user pages). Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-07 02:31:08 +08:00
ci->i_truncate_seq, ci->i_truncate_size,
libceph: don't build request in ceph_osdc_new_request() This patch moves the call to ceph_osdc_build_request() out of ceph_osdc_new_request() and into its caller. This is in order to defer formatting osd operation information into the request message until just before request is started. The only unusual (ab)user of ceph_osdc_build_request() is ceph_writepages_start(), where the final length of write request may change (downward) based on the current inode size or the oldest snapshot context with dirty data for the inode. The remaining callers don't change anything in the request after has been built. This means the ops array is now supplied by the caller. It also means there is no need to pass the mtime to ceph_osdc_new_request() (it gets provided to ceph_osdc_build_request()). And rather than passing a do_sync flag, have the number of ops in the ops array supplied imply adding a second STARTSYNC operation after the READ or WRITE requested. This and some of the patches that follow are related to having the messenger (only) be responsible for filling the content of the message header, as described here: http://tracker.ceph.com/issues/4589 Signed-off-by: Alex Elder <elder@inktank.com> Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
2013-03-15 03:09:05 +08:00
false);
ceph: propagate layout error on osd request creation If we are creating an osd request and get an invalid layout, return an EINVAL to the caller. We switch up the return to have an error code instead of NULL implying -ENOMEM. Signed-off-by: Sage Weil <sage@inktank.com> Reviewed-by: Alex Elder <elder@inktank.com>
2012-09-25 12:01:02 +08:00
if (IS_ERR(req))
return PTR_ERR(req);
ceph: file operations File open and close operations, and read and write methods that ensure we have obtained the proper capabilities from the MDS cluster before performing IO on a file. We take references on held capabilities for the duration of the read/write to avoid prematurely releasing them back to the MDS. We implement two main paths for read and write: one that is buffered (and uses generic_aio_{read,write}), and one that is fully synchronous and blocking (operating either on a __user pointer or, if O_DIRECT, directly on user pages). Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-07 02:31:08 +08:00
libceph: don't assign page info in ceph_osdc_new_request() Currently ceph_osdc_new_request() assigns an osd request's r_num_pages and r_alignment fields. The only thing it does after that is call ceph_osdc_build_request(), and that doesn't need those fields to be assigned. Move the assignment of those fields out of ceph_osdc_new_request() and into its caller. As a result, the page_align parameter is no longer used, so get rid of it. Note that in ceph_sync_write(), the value for req->r_num_pages had already been calculated earlier (as num_pages, and fortunately it was computed the same way). So don't bother recomputing it, but because it's not needed earlier, move that calculation after the call to ceph_osdc_new_request(). Hold off making the assignment to r_alignment, doing it instead r_pages and r_num_pages are getting set. Similarly, in start_read(), nr_pages already holds the number of pages in the array (and is calculated the same way), so there's no need to recompute it. Move the assignment of the page alignment down with the others there as well. This and the next few patches are preparation work for: http://tracker.ceph.com/issues/4127 Signed-off-by: Alex Elder <elder@inktank.com> Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
2013-03-02 08:00:15 +08:00
/* write from beginning of first page, regardless of io alignment */
page_align = file->f_flags & O_DIRECT ? buf_align : io_align;
num_pages = calc_pages_for(page_align, len);
ceph: file operations File open and close operations, and read and write methods that ensure we have obtained the proper capabilities from the MDS cluster before performing IO on a file. We take references on held capabilities for the duration of the read/write to avoid prematurely releasing them back to the MDS. We implement two main paths for read and write: one that is buffered (and uses generic_aio_{read,write}), and one that is fully synchronous and blocking (operating either on a __user pointer or, if O_DIRECT, directly on user pages). Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-07 02:31:08 +08:00
if (file->f_flags & O_DIRECT) {
ceph: mark user pages dirty on direct-io reads For read operation, we have to set the argument _write_ of get_user_pages to 1 since we will write data to pages. Also, we need to SetPageDirty before releasing these pages. Signed-off-by: Henry C Chang <henry_c_chang@tcloudcomputing.com> Signed-off-by: Sage Weil <sage@newdream.net>
2010-12-16 12:45:41 +08:00
pages = ceph_get_direct_page_vector(data, num_pages, false);
ceph: file operations File open and close operations, and read and write methods that ensure we have obtained the proper capabilities from the MDS cluster before performing IO on a file. We take references on held capabilities for the duration of the read/write to avoid prematurely releasing them back to the MDS. We implement two main paths for read and write: one that is buffered (and uses generic_aio_{read,write}), and one that is fully synchronous and blocking (operating either on a __user pointer or, if O_DIRECT, directly on user pages). Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-07 02:31:08 +08:00
if (IS_ERR(pages)) {
ret = PTR_ERR(pages);
goto out;
}
/*
* throw out any page cache pages in this range. this
* may block.
*/
ceph: whitespace cleanup Signed-off-by: Sage Weil <sage@newdream.net>
2010-08-04 01:25:11 +08:00
truncate_inode_pages_range(inode->i_mapping, pos,
ceph: fix direct io truncate offset truncate_inode_pages_range wants the end offset to align with the last byte in a page. Signed-off-by: Sage Weil <sage@newdream.net>
2010-04-23 04:48:59 +08:00
(pos+len) | (PAGE_CACHE_SIZE-1));
ceph: file operations File open and close operations, and read and write methods that ensure we have obtained the proper capabilities from the MDS cluster before performing IO on a file. We take references on held capabilities for the duration of the read/write to avoid prematurely releasing them back to the MDS. We implement two main paths for read and write: one that is buffered (and uses generic_aio_{read,write}), and one that is fully synchronous and blocking (operating either on a __user pointer or, if O_DIRECT, directly on user pages). Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-07 02:31:08 +08:00
} else {
ceph: all allocation functions should get gfp_mask This is essential, as for the rados block device we'll need to run in different contexts that would need flags that are other than GFP_NOFS. Signed-off-by: Yehuda Sadeh <yehuda@hq.newdream.net> Signed-off-by: Sage Weil <sage@newdream.net>
2010-04-07 05:33:58 +08:00
pages = ceph_alloc_page_vector(num_pages, GFP_NOFS);
ceph: file operations File open and close operations, and read and write methods that ensure we have obtained the proper capabilities from the MDS cluster before performing IO on a file. We take references on held capabilities for the duration of the read/write to avoid prematurely releasing them back to the MDS. We implement two main paths for read and write: one that is buffered (and uses generic_aio_{read,write}), and one that is fully synchronous and blocking (operating either on a __user pointer or, if O_DIRECT, directly on user pages). Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-07 02:31:08 +08:00
if (IS_ERR(pages)) {
ret = PTR_ERR(pages);
goto out;
}
ceph: factor out libceph from Ceph file system This factors out protocol and low-level storage parts of ceph into a separate libceph module living in net/ceph and include/linux/ceph. This is mostly a matter of moving files around. However, a few key pieces of the interface change as well: - ceph_client becomes ceph_fs_client and ceph_client, where the latter captures the mon and osd clients, and the fs_client gets the mds client and file system specific pieces. - Mount option parsing and debugfs setup is correspondingly broken into two pieces. - The mon client gets a generic handler callback for otherwise unknown messages (mds map, in this case). - The basic supported/required feature bits can be expanded (and are by ceph_fs_client). No functional change, aside from some subtle error handling cases that got cleaned up in the refactoring process. Signed-off-by: Sage Weil <sage@newdream.net>
2010-04-07 06:14:15 +08:00
ret = ceph_copy_user_to_page_vector(pages, data, pos, len);
ceph: file operations File open and close operations, and read and write methods that ensure we have obtained the proper capabilities from the MDS cluster before performing IO on a file. We take references on held capabilities for the duration of the read/write to avoid prematurely releasing them back to the MDS. We implement two main paths for read and write: one that is buffered (and uses generic_aio_{read,write}), and one that is fully synchronous and blocking (operating either on a __user pointer or, if O_DIRECT, directly on user pages). Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-07 02:31:08 +08:00
if (ret < 0) {
ceph_release_page_vector(pages, num_pages);
goto out;
}
if ((file->f_flags & O_SYNC) == 0) {
/* get a second commit callback */
libceph: change how "safe" callback is used An osd request currently has two callbacks. They inform the initiator of the request when we've received confirmation for the target osd that a request was received, and when the osd indicates all changes described by the request are durable. The only time the second callback is used is in the ceph file system for a synchronous write. There's a race that makes some handling of this case unsafe. This patch addresses this problem. The error handling for this callback is also kind of gross, and this patch changes that as well. In ceph_sync_write(), if a safe callback is requested we want to add the request on the ceph inode's unsafe items list. Because items on this list must have their tid set (by ceph_osd_start_request()), the request added *after* the call to that function returns. The problem with this is that there's a race between starting the request and adding it to the unsafe items list; the request may already be complete before ceph_sync_write() even begins to put it on the list. To address this, we change the way the "safe" callback is used. Rather than just calling it when the request is "safe", we use it to notify the initiator the bounds (start and end) of the period during which the request is *unsafe*. So the initiator gets notified just before the request gets sent to the osd (when it is "unsafe"), and again when it's known the results are durable (it's no longer unsafe). The first call will get made in __send_request(), just before the request message gets sent to the messenger for the first time. That function is only called by __send_queued(), which is always called with the osd client's request mutex held. We then have this callback function insert the request on the ceph inode's unsafe list when we're told the request is unsafe. This will avoid the race because this call will be made under protection of the osd client's request mutex. It also nicely groups the setup and cleanup of the state associated with managing unsafe requests. The name of the "safe" callback field is changed to "unsafe" to better reflect its new purpose. It has a Boolean "unsafe" parameter to indicate whether the request is becoming unsafe or is now safe. Because the "msg" parameter wasn't used, we drop that. This resolves the original problem reportedin: http://tracker.ceph.com/issues/4706 Reported-by: Yan, Zheng <zheng.z.yan@intel.com> Signed-off-by: Alex Elder <elder@inktank.com> Reviewed-by: Yan, Zheng <zheng.z.yan@intel.com> Reviewed-by: Sage Weil <sage@inktank.com>
2013-04-16 00:20:42 +08:00
req->r_unsafe_callback = ceph_sync_write_unsafe;
req->r_inode = inode;
libceph: define osd data initialization helpers Define and use functions that encapsulate the initializion of a ceph_osd_data structure. Signed-off-by: Alex Elder <elder@inktank.com> Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
2013-04-03 14:28:57 +08:00
own_pages = true;
ceph: file operations File open and close operations, and read and write methods that ensure we have obtained the proper capabilities from the MDS cluster before performing IO on a file. We take references on held capabilities for the duration of the read/write to avoid prematurely releasing them back to the MDS. We implement two main paths for read and write: one that is buffered (and uses generic_aio_{read,write}), and one that is fully synchronous and blocking (operating either on a __user pointer or, if O_DIRECT, directly on user pages). Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-07 02:31:08 +08:00
}
}
libceph: kill off osd data write_request parameters In the incremental move toward supporting distinct data items in an osd request some of the functions had "write_request" parameters to indicate, basically, whether the data belonged to in_data or the out_data. Now that we maintain the data fields in the op structure there is no need to indicate the direction, so get rid of the "write_request" parameters. Signed-off-by: Alex Elder <elder@inktank.com> Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
2013-04-16 03:50:36 +08:00
osd_req_op_extent_osd_data_pages(req, 0, pages, len, page_align,
false, own_pages);
ceph: file operations File open and close operations, and read and write methods that ensure we have obtained the proper capabilities from the MDS cluster before performing IO on a file. We take references on held capabilities for the duration of the read/write to avoid prematurely releasing them back to the MDS. We implement two main paths for read and write: one that is buffered (and uses generic_aio_{read,write}), and one that is fully synchronous and blocking (operating either on a __user pointer or, if O_DIRECT, directly on user pages). Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-07 02:31:08 +08:00
libceph: hold off building osd request Defer building the osd request until just before submitting it in all callers except ceph_writepages_start(). (That caller will be handed in the next patch.) Signed-off-by: Alex Elder <elder@inktank.com> Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
2013-03-15 03:09:06 +08:00
/* BUG_ON(vino.snap != CEPH_NOSNAP); */
libceph: keep source rather than message osd op array An osd request keeps a pointer to the osd operations (ops) array that it builds in its request message. In order to allow each op in the array to have its own distinct data, we will need to keep track of each op's data, and that information does not go over the wire. As long as we're tracking the data we might as well just track the entire (source) op definition for each of the ops. And if we're doing that, we'll have no more need to keep a pointer to the wire-encoded version. This patch makes the array of source ops be kept with the osd request structure, and uses that instead of the version encoded in the message in places where that was previously used. The array will be embedded in the request structure, and the maximum number of ops we ever actually use is currently 2. So reduce CEPH_OSD_MAX_OP to 2 to reduce the size of the structure. The result of doing this sort of ripples back up, and as a result various function parameters and local variables become unnecessary. Make r_num_ops be unsigned, and move the definition of struct ceph_osd_req_op earlier to ensure it's defined where needed. It does not yet add per-op data, that's coming soon. This resolves: http://tracker.ceph.com/issues/4656 Signed-off-by: Alex Elder <elder@inktank.com> Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
2013-04-04 10:32:51 +08:00
ceph_osdc_build_request(req, pos, snapc, vino.snap, &mtime);
libceph: hold off building osd request Defer building the osd request until just before submitting it in all callers except ceph_writepages_start(). (That caller will be handed in the next patch.) Signed-off-by: Alex Elder <elder@inktank.com> Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
2013-03-15 03:09:06 +08:00
ceph: factor out libceph from Ceph file system This factors out protocol and low-level storage parts of ceph into a separate libceph module living in net/ceph and include/linux/ceph. This is mostly a matter of moving files around. However, a few key pieces of the interface change as well: - ceph_client becomes ceph_fs_client and ceph_client, where the latter captures the mon and osd clients, and the fs_client gets the mds client and file system specific pieces. - Mount option parsing and debugfs setup is correspondingly broken into two pieces. - The mon client gets a generic handler callback for otherwise unknown messages (mds map, in this case). - The basic supported/required feature bits can be expanded (and are by ceph_fs_client). No functional change, aside from some subtle error handling cases that got cleaned up in the refactoring process. Signed-off-by: Sage Weil <sage@newdream.net>
2010-04-07 06:14:15 +08:00
ret = ceph_osdc_start_request(&fsc->client->osdc, req, false);
libceph: change how "safe" callback is used An osd request currently has two callbacks. They inform the initiator of the request when we've received confirmation for the target osd that a request was received, and when the osd indicates all changes described by the request are durable. The only time the second callback is used is in the ceph file system for a synchronous write. There's a race that makes some handling of this case unsafe. This patch addresses this problem. The error handling for this callback is also kind of gross, and this patch changes that as well. In ceph_sync_write(), if a safe callback is requested we want to add the request on the ceph inode's unsafe items list. Because items on this list must have their tid set (by ceph_osd_start_request()), the request added *after* the call to that function returns. The problem with this is that there's a race between starting the request and adding it to the unsafe items list; the request may already be complete before ceph_sync_write() even begins to put it on the list. To address this, we change the way the "safe" callback is used. Rather than just calling it when the request is "safe", we use it to notify the initiator the bounds (start and end) of the period during which the request is *unsafe*. So the initiator gets notified just before the request gets sent to the osd (when it is "unsafe"), and again when it's known the results are durable (it's no longer unsafe). The first call will get made in __send_request(), just before the request message gets sent to the messenger for the first time. That function is only called by __send_queued(), which is always called with the osd client's request mutex held. We then have this callback function insert the request on the ceph inode's unsafe list when we're told the request is unsafe. This will avoid the race because this call will be made under protection of the osd client's request mutex. It also nicely groups the setup and cleanup of the state associated with managing unsafe requests. The name of the "safe" callback field is changed to "unsafe" to better reflect its new purpose. It has a Boolean "unsafe" parameter to indicate whether the request is becoming unsafe or is now safe. Because the "msg" parameter wasn't used, we drop that. This resolves the original problem reportedin: http://tracker.ceph.com/issues/4706 Reported-by: Yan, Zheng <zheng.z.yan@intel.com> Signed-off-by: Alex Elder <elder@inktank.com> Reviewed-by: Yan, Zheng <zheng.z.yan@intel.com> Reviewed-by: Sage Weil <sage@inktank.com>
2013-04-16 00:20:42 +08:00
if (!ret)
ceph: factor out libceph from Ceph file system This factors out protocol and low-level storage parts of ceph into a separate libceph module living in net/ceph and include/linux/ceph. This is mostly a matter of moving files around. However, a few key pieces of the interface change as well: - ceph_client becomes ceph_fs_client and ceph_client, where the latter captures the mon and osd clients, and the fs_client gets the mds client and file system specific pieces. - Mount option parsing and debugfs setup is correspondingly broken into two pieces. - The mon client gets a generic handler callback for otherwise unknown messages (mds map, in this case). - The basic supported/required feature bits can be expanded (and are by ceph_fs_client). No functional change, aside from some subtle error handling cases that got cleaned up in the refactoring process. Signed-off-by: Sage Weil <sage@newdream.net>
2010-04-07 06:14:15 +08:00
ret = ceph_osdc_wait_request(&fsc->client->osdc, req);
ceph: file operations File open and close operations, and read and write methods that ensure we have obtained the proper capabilities from the MDS cluster before performing IO on a file. We take references on held capabilities for the duration of the read/write to avoid prematurely releasing them back to the MDS. We implement two main paths for read and write: one that is buffered (and uses generic_aio_{read,write}), and one that is fully synchronous and blocking (operating either on a __user pointer or, if O_DIRECT, directly on user pages). Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-07 02:31:08 +08:00
if (file->f_flags & O_DIRECT)
ceph: mark user pages dirty on direct-io reads For read operation, we have to set the argument _write_ of get_user_pages to 1 since we will write data to pages. Also, we need to SetPageDirty before releasing these pages. Signed-off-by: Henry C Chang <henry_c_chang@tcloudcomputing.com> Signed-off-by: Sage Weil <sage@newdream.net>
2010-12-16 12:45:41 +08:00
ceph_put_page_vector(pages, num_pages, false);
ceph: file operations File open and close operations, and read and write methods that ensure we have obtained the proper capabilities from the MDS cluster before performing IO on a file. We take references on held capabilities for the duration of the read/write to avoid prematurely releasing them back to the MDS. We implement two main paths for read and write: one that is buffered (and uses generic_aio_{read,write}), and one that is fully synchronous and blocking (operating either on a __user pointer or, if O_DIRECT, directly on user pages). Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-07 02:31:08 +08:00
else if (file->f_flags & O_SYNC)
ceph_release_page_vector(pages, num_pages);
out:
ceph_osdc_put_request(req);
if (ret == 0) {
pos += len;
written += len;
left -= len;
ceph: fix buffer pointer advance in ceph_sync_write We should advance the user data pointer by _len_ instead of _written_. _len_ is the data length written in each iteration while _written_ is the accumulated data length we have writtent out. Signed-off-by: Henry C Chang <henry.cy.chang@gmail.com> Reviewed-by: Greg Farnum <greg@inktank.com> Tested-by: Sage Weil <sage@inktank.com>
2013-03-19 09:46:26 +08:00
data += len;
ceph: file operations File open and close operations, and read and write methods that ensure we have obtained the proper capabilities from the MDS cluster before performing IO on a file. We take references on held capabilities for the duration of the read/write to avoid prematurely releasing them back to the MDS. We implement two main paths for read and write: one that is buffered (and uses generic_aio_{read,write}), and one that is fully synchronous and blocking (operating either on a __user pointer or, if O_DIRECT, directly on user pages). Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-07 02:31:08 +08:00
if (left)
goto more;
ret = written;
ceph: apply write checks in ceph_aio_write copy write checks in __generic_file_aio_write to ceph_aio_write. To make these checks cover sync write path. Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com> Reviewed-by: Alex Elder <elder@inktank.com>
2013-04-12 16:11:13 +08:00
*ppos = pos;
ceph: file operations File open and close operations, and read and write methods that ensure we have obtained the proper capabilities from the MDS cluster before performing IO on a file. We take references on held capabilities for the duration of the read/write to avoid prematurely releasing them back to the MDS. We implement two main paths for read and write: one that is buffered (and uses generic_aio_{read,write}), and one that is fully synchronous and blocking (operating either on a __user pointer or, if O_DIRECT, directly on user pages). Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-07 02:31:08 +08:00
if (pos > i_size_read(inode))
check_caps = ceph_inode_set_size(inode, pos);
if (check_caps)
ceph_check_caps(ceph_inode(inode), CHECK_CAPS_AUTHONLY,
NULL);
ceph: allow sync_read/write return partial successed size of read/write. For sync_read/write, it may do multi stripe operations.If one of those met erro, we return the former successed size rather than a error value. There is a exception for write-operation met -EOLDSNAPC.If this occur,we retry the whole write again. Signed-off-by: Jianpeng Ma <majianpeng@gmail.com>
2013-08-21 15:02:51 +08:00
} else if (ret != -EOLDSNAPC && written > 0) {
ret = written;
ceph: file operations File open and close operations, and read and write methods that ensure we have obtained the proper capabilities from the MDS cluster before performing IO on a file. We take references on held capabilities for the duration of the read/write to avoid prematurely releasing them back to the MDS. We implement two main paths for read and write: one that is buffered (and uses generic_aio_{read,write}), and one that is fully synchronous and blocking (operating either on a __user pointer or, if O_DIRECT, directly on user pages). Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-07 02:31:08 +08:00
}
return ret;
}
/*
* Wrap generic_file_aio_read with checks for cap bits on the inode.
* Atomically grab references, so that those bits are not released
* back to the MDS mid-read.
*
* Hmm, the sync read case isn't actually async... should it be?
*/
static ssize_t ceph_aio_read(struct kiocb *iocb, const struct iovec *iov,
unsigned long nr_segs, loff_t pos)
{
struct file *filp = iocb->ki_filp;
ceph: perform lazy reads when file mode and caps permit If the file mode is marked as "lazy," perform cached/buffered reads when the caps permit it. Adjust the rdcache_gen and invalidation logic accordingly so that we manage our cache based on the FILE_CACHE -or- FILE_LAZYIO cap bits. Signed-off-by: Sage Weil <sage@newdream.net>
2010-05-28 01:40:43 +08:00
struct ceph_file_info *fi = filp->private_data;
ceph: file operations File open and close operations, and read and write methods that ensure we have obtained the proper capabilities from the MDS cluster before performing IO on a file. We take references on held capabilities for the duration of the read/write to avoid prematurely releasing them back to the MDS. We implement two main paths for read and write: one that is buffered (and uses generic_aio_{read,write}), and one that is fully synchronous and blocking (operating either on a __user pointer or, if O_DIRECT, directly on user pages). Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-07 02:31:08 +08:00
loff_t *ppos = &iocb->ki_pos;
size_t len = iov->iov_len;
new helper: file_inode(file) Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-01-24 06:07:38 +08:00
struct inode *inode = file_inode(filp);
ceph: file operations File open and close operations, and read and write methods that ensure we have obtained the proper capabilities from the MDS cluster before performing IO on a file. We take references on held capabilities for the duration of the read/write to avoid prematurely releasing them back to the MDS. We implement two main paths for read and write: one that is buffered (and uses generic_aio_{read,write}), and one that is fully synchronous and blocking (operating either on a __user pointer or, if O_DIRECT, directly on user pages). Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-07 02:31:08 +08:00
struct ceph_inode_info *ci = ceph_inode(inode);
ceph: code cleanup Mainly fixing minor issues reported by sparse. Signed-off-by: Yehuda Sadeh <yehuda@hq.newdream.net> Signed-off-by: Sage Weil <sage@newdream.net>
2010-06-12 07:58:48 +08:00
void __user *base = iov->iov_base;
ceph: file operations File open and close operations, and read and write methods that ensure we have obtained the proper capabilities from the MDS cluster before performing IO on a file. We take references on held capabilities for the duration of the read/write to avoid prematurely releasing them back to the MDS. We implement two main paths for read and write: one that is buffered (and uses generic_aio_{read,write}), and one that is fully synchronous and blocking (operating either on a __user pointer or, if O_DIRECT, directly on user pages). Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-07 02:31:08 +08:00
ssize_t ret;
ceph: perform lazy reads when file mode and caps permit If the file mode is marked as "lazy," perform cached/buffered reads when the caps permit it. Adjust the rdcache_gen and invalidation logic accordingly so that we manage our cache based on the FILE_CACHE -or- FILE_LAZYIO cap bits. Signed-off-by: Sage Weil <sage@newdream.net>
2010-05-28 01:40:43 +08:00
int want, got = 0;
ceph: fix sync read eof check deadlock If a sync read gets a short result from the OSD, it may need to do a getattr to see if it is short due to reaching end-of-file. The getattr was being done while holding a reference to FILE_RD, which can lead to a deadlock if the MDS is revoking that capability bit and can't process the getattr until it does. We fix this by setting a flag if EOF size validation is needed, and doing the getattr in ceph_aio_read, after the RD cap ref is dropped. If the read needs to be continued, we loop and continue traversing the file. Signed-off-by: Sage Weil <sage@newdream.net>
2010-02-10 06:04:02 +08:00
int checkeof = 0, read = 0;
ceph: file operations File open and close operations, and read and write methods that ensure we have obtained the proper capabilities from the MDS cluster before performing IO on a file. We take references on held capabilities for the duration of the read/write to avoid prematurely releasing them back to the MDS. We implement two main paths for read and write: one that is buffered (and uses generic_aio_{read,write}), and one that is fully synchronous and blocking (operating either on a __user pointer or, if O_DIRECT, directly on user pages). Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-07 02:31:08 +08:00
dout("aio_read %p %llx.%llx %llu~%u trying to get caps on %p\n",
inode, ceph_vinop(inode), pos, (unsigned)len, inode);
ceph: fix sync read eof check deadlock If a sync read gets a short result from the OSD, it may need to do a getattr to see if it is short due to reaching end-of-file. The getattr was being done while holding a reference to FILE_RD, which can lead to a deadlock if the MDS is revoking that capability bit and can't process the getattr until it does. We fix this by setting a flag if EOF size validation is needed, and doing the getattr in ceph_aio_read, after the RD cap ref is dropped. If the read needs to be continued, we loop and continue traversing the file. Signed-off-by: Sage Weil <sage@newdream.net>
2010-02-10 06:04:02 +08:00
again:
ceph: perform lazy reads when file mode and caps permit If the file mode is marked as "lazy," perform cached/buffered reads when the caps permit it. Adjust the rdcache_gen and invalidation logic accordingly so that we manage our cache based on the FILE_CACHE -or- FILE_LAZYIO cap bits. Signed-off-by: Sage Weil <sage@newdream.net>
2010-05-28 01:40:43 +08:00
if (fi->fmode & CEPH_FILE_MODE_LAZY)
want = CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO;
else
want = CEPH_CAP_FILE_CACHE;
ret = ceph_get_caps(ci, CEPH_CAP_FILE_RD, want, &got, -1);
ceph: file operations File open and close operations, and read and write methods that ensure we have obtained the proper capabilities from the MDS cluster before performing IO on a file. We take references on held capabilities for the duration of the read/write to avoid prematurely releasing them back to the MDS. We implement two main paths for read and write: one that is buffered (and uses generic_aio_{read,write}), and one that is fully synchronous and blocking (operating either on a __user pointer or, if O_DIRECT, directly on user pages). Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-07 02:31:08 +08:00
if (ret < 0)
goto out;
dout("aio_read %p %llx.%llx %llu~%u got cap refs on %s\n",
inode, ceph_vinop(inode), pos, (unsigned)len,
ceph_cap_string(got));
ceph: perform lazy reads when file mode and caps permit If the file mode is marked as "lazy," perform cached/buffered reads when the caps permit it. Adjust the rdcache_gen and invalidation logic accordingly so that we manage our cache based on the FILE_CACHE -or- FILE_LAZYIO cap bits. Signed-off-by: Sage Weil <sage@newdream.net>
2010-05-28 01:40:43 +08:00
if ((got & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) == 0 ||
ceph: file operations File open and close operations, and read and write methods that ensure we have obtained the proper capabilities from the MDS cluster before performing IO on a file. We take references on held capabilities for the duration of the read/write to avoid prematurely releasing them back to the MDS. We implement two main paths for read and write: one that is buffered (and uses generic_aio_{read,write}), and one that is fully synchronous and blocking (operating either on a __user pointer or, if O_DIRECT, directly on user pages). Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-07 02:31:08 +08:00
(iocb->ki_filp->f_flags & O_DIRECT) ||
ceph: add F_SYNC file flag to force sync (non-O_DIRECT) io This allows us to force IO through the sync path which you normally only get when multiple clients are reading/writing to the same file or by mounting with -o sync. Among other things, this lets test programs verify correctness with a single mount. Reviewed-by: Yehuda Sadeh <yehuda@hq.newdream.net> Signed-off-by: Sage Weil <sage@newdream.net>
2011-07-27 02:26:07 +08:00
(fi->flags & CEPH_F_SYNC))
ceph: file operations File open and close operations, and read and write methods that ensure we have obtained the proper capabilities from the MDS cluster before performing IO on a file. We take references on held capabilities for the duration of the read/write to avoid prematurely releasing them back to the MDS. We implement two main paths for read and write: one that is buffered (and uses generic_aio_{read,write}), and one that is fully synchronous and blocking (operating either on a __user pointer or, if O_DIRECT, directly on user pages). Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-07 02:31:08 +08:00
/* hmm, this isn't really async... */
ceph: fix sync read eof check deadlock If a sync read gets a short result from the OSD, it may need to do a getattr to see if it is short due to reaching end-of-file. The getattr was being done while holding a reference to FILE_RD, which can lead to a deadlock if the MDS is revoking that capability bit and can't process the getattr until it does. We fix this by setting a flag if EOF size validation is needed, and doing the getattr in ceph_aio_read, after the RD cap ref is dropped. If the read needs to be continued, we loop and continue traversing the file. Signed-off-by: Sage Weil <sage@newdream.net>
2010-02-10 06:04:02 +08:00
ret = ceph_sync_read(filp, base, len, ppos, &checkeof);
ceph: file operations File open and close operations, and read and write methods that ensure we have obtained the proper capabilities from the MDS cluster before performing IO on a file. We take references on held capabilities for the duration of the read/write to avoid prematurely releasing them back to the MDS. We implement two main paths for read and write: one that is buffered (and uses generic_aio_{read,write}), and one that is fully synchronous and blocking (operating either on a __user pointer or, if O_DIRECT, directly on user pages). Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-07 02:31:08 +08:00
else
ret = generic_file_aio_read(iocb, iov, nr_segs, pos);
out:
dout("aio_read %p %llx.%llx dropping cap refs on %s = %d\n",
inode, ceph_vinop(inode), ceph_cap_string(got), (int)ret);
ceph_put_cap_refs(ci, got);
ceph: fix sync read eof check deadlock If a sync read gets a short result from the OSD, it may need to do a getattr to see if it is short due to reaching end-of-file. The getattr was being done while holding a reference to FILE_RD, which can lead to a deadlock if the MDS is revoking that capability bit and can't process the getattr until it does. We fix this by setting a flag if EOF size validation is needed, and doing the getattr in ceph_aio_read, after the RD cap ref is dropped. If the read needs to be continued, we loop and continue traversing the file. Signed-off-by: Sage Weil <sage@newdream.net>
2010-02-10 06:04:02 +08:00
if (checkeof && ret >= 0) {
int statret = ceph_do_getattr(inode, CEPH_STAT_CAP_SIZE);
/* hit EOF or hole? */
if (statret == 0 && *ppos < inode->i_size) {
ceph: fix short sync reads from the OSD If we get a short read from the OSD because the object is small, we need to zero the remainder of the buffer. For O_DIRECT reads, the attempted range is not trimmed to i_size by the VFS, so we were actually looping indefinitely. Fix by trimming by i_size, and the unconditionally zeroing the trailing range. Reported-by: Jeff Wu <cpwu@tnsoft.com.cn> Signed-off-by: Sage Weil <sage@newdream.net>
2011-06-02 07:08:44 +08:00
dout("aio_read sync_read hit hole, ppos %lld < size %lld, reading more\n", *ppos, inode->i_size);
ceph: fix sync read eof check deadlock If a sync read gets a short result from the OSD, it may need to do a getattr to see if it is short due to reaching end-of-file. The getattr was being done while holding a reference to FILE_RD, which can lead to a deadlock if the MDS is revoking that capability bit and can't process the getattr until it does. We fix this by setting a flag if EOF size validation is needed, and doing the getattr in ceph_aio_read, after the RD cap ref is dropped. If the read needs to be continued, we loop and continue traversing the file. Signed-off-by: Sage Weil <sage@newdream.net>
2010-02-10 06:04:02 +08:00
read += ret;
base += ret;
len -= ret;
checkeof = 0;
goto again;
}
}
if (ret >= 0)
ret += read;
ceph: file operations File open and close operations, and read and write methods that ensure we have obtained the proper capabilities from the MDS cluster before performing IO on a file. We take references on held capabilities for the duration of the read/write to avoid prematurely releasing them back to the MDS. We implement two main paths for read and write: one that is buffered (and uses generic_aio_{read,write}), and one that is fully synchronous and blocking (operating either on a __user pointer or, if O_DIRECT, directly on user pages). Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-07 02:31:08 +08:00
return ret;
}
/*
* Take cap references to avoid releasing caps to MDS mid-write.
*
* If we are synchronous, and write with an old snap context, the OSD
* may return EOLDSNAPC. In that case, retry the write.. _after_
* dropping our cap refs and allowing the pending snap to logically
* complete _before_ this write occurs.
*
* If we are near ENOSPC, write synchronously.
*/
static ssize_t ceph_aio_write(struct kiocb *iocb, const struct iovec *iov,
unsigned long nr_segs, loff_t pos)
{
struct file *file = iocb->ki_filp;
ceph: perform lazy writes when file mode and caps permit If we have marked a file as "lazy" (using the ceph ioctl), perform buffered writes when the MDS caps allow it. Signed-off-by: Sage Weil <sage@newdream.net>
2010-05-27 05:31:27 +08:00
struct ceph_file_info *fi = file->private_data;
new helper: file_inode(file) Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-01-24 06:07:38 +08:00
struct inode *inode = file_inode(file);
ceph: file operations File open and close operations, and read and write methods that ensure we have obtained the proper capabilities from the MDS cluster before performing IO on a file. We take references on held capabilities for the duration of the read/write to avoid prematurely releasing them back to the MDS. We implement two main paths for read and write: one that is buffered (and uses generic_aio_{read,write}), and one that is fully synchronous and blocking (operating either on a __user pointer or, if O_DIRECT, directly on user pages). Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-07 02:31:08 +08:00
struct ceph_inode_info *ci = ceph_inode(inode);
ceph: factor out libceph from Ceph file system This factors out protocol and low-level storage parts of ceph into a separate libceph module living in net/ceph and include/linux/ceph. This is mostly a matter of moving files around. However, a few key pieces of the interface change as well: - ceph_client becomes ceph_fs_client and ceph_client, where the latter captures the mon and osd clients, and the fs_client gets the mds client and file system specific pieces. - Mount option parsing and debugfs setup is correspondingly broken into two pieces. - The mon client gets a generic handler callback for otherwise unknown messages (mds map, in this case). - The basic supported/required feature bits can be expanded (and are by ceph_fs_client). No functional change, aside from some subtle error handling cases that got cleaned up in the refactoring process. Signed-off-by: Sage Weil <sage@newdream.net>
2010-04-07 06:14:15 +08:00
struct ceph_osd_client *osdc =
&ceph_sb_to_client(inode->i_sb)->client->osdc;
ceph: apply write checks in ceph_aio_write copy write checks in __generic_file_aio_write to ceph_aio_write. To make these checks cover sync write path. Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com> Reviewed-by: Alex Elder <elder@inktank.com>
2013-04-12 16:11:13 +08:00
ssize_t count, written = 0;
int err, want, got;
ceph: file operations File open and close operations, and read and write methods that ensure we have obtained the proper capabilities from the MDS cluster before performing IO on a file. We take references on held capabilities for the duration of the read/write to avoid prematurely releasing them back to the MDS. We implement two main paths for read and write: one that is buffered (and uses generic_aio_{read,write}), and one that is fully synchronous and blocking (operating either on a __user pointer or, if O_DIRECT, directly on user pages). Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-07 02:31:08 +08:00
if (ceph_snap(inode) != CEPH_NOSNAP)
return -EROFS;
ceph: apply write checks in ceph_aio_write copy write checks in __generic_file_aio_write to ceph_aio_write. To make these checks cover sync write path. Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com> Reviewed-by: Alex Elder <elder@inktank.com>
2013-04-12 16:11:13 +08:00
mutex_lock(&inode->i_mutex);
err = generic_segment_checks(iov, &nr_segs, &count, VERIFY_READ);
if (err)
goto out;
/* We can write back this queue in page reclaim */
current->backing_dev_info = file->f_mapping->backing_dev_info;
err = generic_write_checks(file, &pos, &count, S_ISBLK(inode->i_mode));
if (err)
goto out;
if (count == 0)
goto out;
err = file_remove_suid(file);
if (err)
goto out;
err = file_update_time(file);
if (err)
goto out;
ceph: file operations File open and close operations, and read and write methods that ensure we have obtained the proper capabilities from the MDS cluster before performing IO on a file. We take references on held capabilities for the duration of the read/write to avoid prematurely releasing them back to the MDS. We implement two main paths for read and write: one that is buffered (and uses generic_aio_{read,write}), and one that is fully synchronous and blocking (operating either on a __user pointer or, if O_DIRECT, directly on user pages). Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-07 02:31:08 +08:00
retry_snap:
ceph: don't early drop Fw cap ceph_aio_write() has an optimization that marks CEPH_CAP_FILE_WR cap dirty before data is copied to page cache and inode size is updated. The optimization avoids slow cap revocation caused by balance_dirty_pages(), but introduces inode size update race. If ceph_check_caps() flushes the dirty cap before the inode size is updated, MDS can miss the new inode size. So just remove the optimization. Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com> Reviewed-by: Greg Farnum <greg@inktank.com>
2013-03-01 10:55:39 +08:00
if (ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_FULL)) {
ceph: apply write checks in ceph_aio_write copy write checks in __generic_file_aio_write to ceph_aio_write. To make these checks cover sync write path. Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com> Reviewed-by: Alex Elder <elder@inktank.com>
2013-04-12 16:11:13 +08:00
err = -ENOSPC;
ceph: don't early drop Fw cap ceph_aio_write() has an optimization that marks CEPH_CAP_FILE_WR cap dirty before data is copied to page cache and inode size is updated. The optimization avoids slow cap revocation caused by balance_dirty_pages(), but introduces inode size update race. If ceph_check_caps() flushes the dirty cap before the inode size is updated, MDS can miss the new inode size. So just remove the optimization. Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com> Reviewed-by: Greg Farnum <greg@inktank.com>
2013-03-01 10:55:39 +08:00
goto out;
}
ceph: apply write checks in ceph_aio_write copy write checks in __generic_file_aio_write to ceph_aio_write. To make these checks cover sync write path. Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com> Reviewed-by: Alex Elder <elder@inktank.com>
2013-04-12 16:11:13 +08:00
ceph: fix printk format warnings in file.c Fix printk format warnings by using %zd for 'ssize_t' variables: fs/ceph/file.c:751:2: warning: format '%ld' expects argument of type 'long int', but argument 11 has type 'ssize_t' [-Wformat] fs/ceph/file.c:762:2: warning: format '%ld' expects argument of type 'long int', but argument 11 has type 'ssize_t' [-Wformat] Signed-off-by: Randy Dunlap <rdunlap@infradead.org> Cc: ceph-devel@vger.kernel.org Signed-off-by: Sage Weil <sage@inktank.com>
2013-04-20 05:20:07 +08:00
dout("aio_write %p %llx.%llx %llu~%zd getting caps. i_size %llu\n",
ceph: apply write checks in ceph_aio_write copy write checks in __generic_file_aio_write to ceph_aio_write. To make these checks cover sync write path. Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com> Reviewed-by: Alex Elder <elder@inktank.com>
2013-04-12 16:11:13 +08:00
inode, ceph_vinop(inode), pos, count, inode->i_size);
ceph: revert commit 22cddde104 commit 22cddde104 breaks the atomicity of write operation, it also introduces a deadlock between write and truncate. Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com> Reviewed-by: Greg Farnum <greg@inktank.com> Conflicts: fs/ceph/addr.c
2013-05-02 12:15:58 +08:00
if (fi->fmode & CEPH_FILE_MODE_LAZY)
want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO;
else
want = CEPH_CAP_FILE_BUFFER;
ceph: apply write checks in ceph_aio_write copy write checks in __generic_file_aio_write to ceph_aio_write. To make these checks cover sync write path. Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com> Reviewed-by: Alex Elder <elder@inktank.com>
2013-04-12 16:11:13 +08:00
got = 0;
err = ceph_get_caps(ci, CEPH_CAP_FILE_WR, want, &got, pos + count);
if (err < 0)
ceph: take i_mutex before getting Fw cap There is deadlock as illustrated bellow. The fix is taking i_mutex before getting Fw cap reference. write truncate MDS --------------------- -------------------- -------------- get Fw cap lock i_mutex lock i_mutex (blocked) request setattr.size -> <- revoke Fw cap Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com> Reviewed-by: Alex Elder <elder@inktank.com> Reviewed-by: Sage Weil <sage@inktank.com>
2013-04-12 16:11:10 +08:00
goto out;
ceph: file operations File open and close operations, and read and write methods that ensure we have obtained the proper capabilities from the MDS cluster before performing IO on a file. We take references on held capabilities for the duration of the read/write to avoid prematurely releasing them back to the MDS. We implement two main paths for read and write: one that is buffered (and uses generic_aio_{read,write}), and one that is fully synchronous and blocking (operating either on a __user pointer or, if O_DIRECT, directly on user pages). Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-07 02:31:08 +08:00
ceph: fix printk format warnings in file.c Fix printk format warnings by using %zd for 'ssize_t' variables: fs/ceph/file.c:751:2: warning: format '%ld' expects argument of type 'long int', but argument 11 has type 'ssize_t' [-Wformat] fs/ceph/file.c:762:2: warning: format '%ld' expects argument of type 'long int', but argument 11 has type 'ssize_t' [-Wformat] Signed-off-by: Randy Dunlap <rdunlap@infradead.org> Cc: ceph-devel@vger.kernel.org Signed-off-by: Sage Weil <sage@inktank.com>
2013-04-20 05:20:07 +08:00
dout("aio_write %p %llx.%llx %llu~%zd got cap refs on %s\n",
ceph: apply write checks in ceph_aio_write copy write checks in __generic_file_aio_write to ceph_aio_write. To make these checks cover sync write path. Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com> Reviewed-by: Alex Elder <elder@inktank.com>
2013-04-12 16:11:13 +08:00
inode, ceph_vinop(inode), pos, count, ceph_cap_string(got));
ceph: revert commit 22cddde104 commit 22cddde104 breaks the atomicity of write operation, it also introduces a deadlock between write and truncate. Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com> Reviewed-by: Greg Farnum <greg@inktank.com> Conflicts: fs/ceph/addr.c
2013-05-02 12:15:58 +08:00
if ((got & (CEPH_CAP_FILE_BUFFER|CEPH_CAP_FILE_LAZYIO)) == 0 ||
(iocb->ki_filp->f_flags & O_DIRECT) ||
(fi->flags & CEPH_F_SYNC)) {
ceph: take i_mutex before getting Fw cap There is deadlock as illustrated bellow. The fix is taking i_mutex before getting Fw cap reference. write truncate MDS --------------------- -------------------- -------------- get Fw cap lock i_mutex lock i_mutex (blocked) request setattr.size -> <- revoke Fw cap Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com> Reviewed-by: Alex Elder <elder@inktank.com> Reviewed-by: Sage Weil <sage@inktank.com>
2013-04-12 16:11:10 +08:00
mutex_unlock(&inode->i_mutex);
ceph: apply write checks in ceph_aio_write copy write checks in __generic_file_aio_write to ceph_aio_write. To make these checks cover sync write path. Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com> Reviewed-by: Alex Elder <elder@inktank.com>
2013-04-12 16:11:13 +08:00
written = ceph_sync_write(file, iov->iov_base, count,
pos, &iocb->ki_pos);
ceph: Move the place for EOLDSNAPC handle in ceph_aio_write to easily understand Only for ceph_sync_write, the osd can return EOLDSNAPC.so move the related codes after the call ceph_sync_write. Signed-off-by: Jianpeng Ma <majianpeng@gmail.com> Reviewed-by: Sage Weil <sage@inktank.com>
2013-08-08 15:32:19 +08:00
if (written == -EOLDSNAPC) {
dout("aio_write %p %llx.%llx %llu~%u"
"got EOLDSNAPC, retrying\n",
inode, ceph_vinop(inode),
pos, (unsigned)iov->iov_len);
mutex_lock(&inode->i_mutex);
goto retry_snap;
}
ceph: revert commit 22cddde104 commit 22cddde104 breaks the atomicity of write operation, it also introduces a deadlock between write and truncate. Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com> Reviewed-by: Greg Farnum <greg@inktank.com> Conflicts: fs/ceph/addr.c
2013-05-02 12:15:58 +08:00
} else {
ceph: introduce i_truncate_mutex I encountered below deadlock when running fsstress wmtruncate work truncate MDS --------------- ------------------ -------------------------- lock i_mutex <- truncate file lock i_mutex (blocked) <- revoking Fcb (filelock to MIX) send request -> handle request (xlock filelock) At the initial time, there are some dirty pages in the page cache. When the kclient receives the truncate message, it reduces inode size and creates some 'out of i_size' dirty pages. wmtruncate work can't truncate these dirty pages because it's blocked by the i_mutex. Later when the kclient receives the cap message that revokes Fcb caps, It can't flush all dirty pages because writepages() only flushes dirty pages within the inode size. When the MDS handles the 'truncate' request from kclient, it waits for the filelock to become stable. But the filelock is stuck in unstable state because it can't finish revoking kclient's Fcb caps. The truncate pagecache locking has already caused lots of trouble for use. I think it's time simplify it by introducing a new mutex. We use the new mutex to prevent concurrent truncate_inode_pages(). There is no need to worry about race between buffered write and truncate_inode_pages(), because our "get caps" mechanism prevents them from concurrent execution. Reviewed-by: Sage Weil <sage@inktank.com> Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com>
2013-08-13 12:42:15 +08:00
/*
* No need to acquire the i_truncate_mutex. Because
* the MDS revokes Fwb caps before sending truncate
* message to us. We can't get Fwb cap while there
* are pending vmtruncate. So write and vmtruncate
* can not run at the same time
*/
ceph: apply write checks in ceph_aio_write copy write checks in __generic_file_aio_write to ceph_aio_write. To make these checks cover sync write path. Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com> Reviewed-by: Alex Elder <elder@inktank.com>
2013-04-12 16:11:13 +08:00
written = generic_file_buffered_write(iocb, iov, nr_segs,
pos, &iocb->ki_pos,
count, 0);
ceph: don't early drop Fw cap ceph_aio_write() has an optimization that marks CEPH_CAP_FILE_WR cap dirty before data is copied to page cache and inode size is updated. The optimization avoids slow cap revocation caused by balance_dirty_pages(), but introduces inode size update race. If ceph_check_caps() flushes the dirty cap before the inode size is updated, MDS can miss the new inode size. So just remove the optimization. Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com> Reviewed-by: Greg Farnum <greg@inktank.com>
2013-03-01 10:55:39 +08:00
mutex_unlock(&inode->i_mutex);
ceph: revert commit 22cddde104 commit 22cddde104 breaks the atomicity of write operation, it also introduces a deadlock between write and truncate. Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com> Reviewed-by: Greg Farnum <greg@inktank.com> Conflicts: fs/ceph/addr.c
2013-05-02 12:15:58 +08:00
}
ceph: avoid carrying Fw cap during write into page cache The generic_file_aio_write call may block on balance_dirty_pages while we flush data to the OSDs. If we hold a reference to the FILE_WR cap during that interval revocation by the MDS (e.g., to do a stat(2)) may be very slow. Reviewed-by: Yehuda Sadeh <yehuda@hq.newdream.net> Signed-off-by: Sage Weil <sage@newdream.net>
2011-07-27 02:27:34 +08:00
ceph: apply write checks in ceph_aio_write copy write checks in __generic_file_aio_write to ceph_aio_write. To make these checks cover sync write path. Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com> Reviewed-by: Alex Elder <elder@inktank.com>
2013-04-12 16:11:13 +08:00
if (written >= 0) {
ceph: do not call __mark_dirty_inode under i_lock The __mark_dirty_inode helper now takes i_lock as of 250df6ed. Fix the one ceph callers that held i_lock (__ceph_mark_dirty_caps) to return the flags value so that the callers can do it outside of i_lock. Signed-off-by: Sage Weil <sage@newdream.net>
2011-05-05 02:33:47 +08:00
int dirty;
ceph: use i_ceph_lock instead of i_lock We have been using i_lock to protect all kinds of data structures in the ceph_inode_info struct, including lists of inodes that we need to iterate over while avoiding races with inode destruction. That requires grabbing a reference to the inode with the list lock protected, but igrab() now takes i_lock to check the inode flags. Changing the list lock ordering would be a painful process. However, using a ceph-specific i_ceph_lock in the ceph inode instead of i_lock is a simple mechanical change and avoids the ordering constraints imposed by igrab(). Reported-by: Amon Ott <a.ott@m-privacy.de> Signed-off-by: Sage Weil <sage@newdream.net>
2011-12-01 01:47:09 +08:00
spin_lock(&ci->i_ceph_lock);
ceph: do not call __mark_dirty_inode under i_lock The __mark_dirty_inode helper now takes i_lock as of 250df6ed. Fix the one ceph callers that held i_lock (__ceph_mark_dirty_caps) to return the flags value so that the callers can do it outside of i_lock. Signed-off-by: Sage Weil <sage@newdream.net>
2011-05-05 02:33:47 +08:00
dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR);
ceph: use i_ceph_lock instead of i_lock We have been using i_lock to protect all kinds of data structures in the ceph_inode_info struct, including lists of inodes that we need to iterate over while avoiding races with inode destruction. That requires grabbing a reference to the inode with the list lock protected, but igrab() now takes i_lock to check the inode flags. Changing the list lock ordering would be a painful process. However, using a ceph-specific i_ceph_lock in the ceph inode instead of i_lock is a simple mechanical change and avoids the ordering constraints imposed by igrab(). Reported-by: Amon Ott <a.ott@m-privacy.de> Signed-off-by: Sage Weil <sage@newdream.net>
2011-12-01 01:47:09 +08:00
spin_unlock(&ci->i_ceph_lock);
ceph: do not call __mark_dirty_inode under i_lock The __mark_dirty_inode helper now takes i_lock as of 250df6ed. Fix the one ceph callers that held i_lock (__ceph_mark_dirty_caps) to return the flags value so that the callers can do it outside of i_lock. Signed-off-by: Sage Weil <sage@newdream.net>
2011-05-05 02:33:47 +08:00
if (dirty)
__mark_inode_dirty(inode, dirty);
ceph: file operations File open and close operations, and read and write methods that ensure we have obtained the proper capabilities from the MDS cluster before performing IO on a file. We take references on held capabilities for the duration of the read/write to avoid prematurely releasing them back to the MDS. We implement two main paths for read and write: one that is buffered (and uses generic_aio_{read,write}), and one that is fully synchronous and blocking (operating either on a __user pointer or, if O_DIRECT, directly on user pages). Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-07 02:31:08 +08:00
}
ceph: revert commit 22cddde104 commit 22cddde104 breaks the atomicity of write operation, it also introduces a deadlock between write and truncate. Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com> Reviewed-by: Greg Farnum <greg@inktank.com> Conflicts: fs/ceph/addr.c
2013-05-02 12:15:58 +08:00
ceph: file operations File open and close operations, and read and write methods that ensure we have obtained the proper capabilities from the MDS cluster before performing IO on a file. We take references on held capabilities for the duration of the read/write to avoid prematurely releasing them back to the MDS. We implement two main paths for read and write: one that is buffered (and uses generic_aio_{read,write}), and one that is fully synchronous and blocking (operating either on a __user pointer or, if O_DIRECT, directly on user pages). Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-07 02:31:08 +08:00
dout("aio_write %p %llx.%llx %llu~%u dropping cap refs on %s\n",
ceph: revert commit 22cddde104 commit 22cddde104 breaks the atomicity of write operation, it also introduces a deadlock between write and truncate. Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com> Reviewed-by: Greg Farnum <greg@inktank.com> Conflicts: fs/ceph/addr.c
2013-05-02 12:15:58 +08:00
inode, ceph_vinop(inode), pos, (unsigned)iov->iov_len,
ceph_cap_string(got));
ceph: file operations File open and close operations, and read and write methods that ensure we have obtained the proper capabilities from the MDS cluster before performing IO on a file. We take references on held capabilities for the duration of the read/write to avoid prematurely releasing them back to the MDS. We implement two main paths for read and write: one that is buffered (and uses generic_aio_{read,write}), and one that is fully synchronous and blocking (operating either on a __user pointer or, if O_DIRECT, directly on user pages). Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-07 02:31:08 +08:00
ceph_put_cap_refs(ci, got);
ceph: revert commit 22cddde104 commit 22cddde104 breaks the atomicity of write operation, it also introduces a deadlock between write and truncate. Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com> Reviewed-by: Greg Farnum <greg@inktank.com> Conflicts: fs/ceph/addr.c
2013-05-02 12:15:58 +08:00
ceph: apply write checks in ceph_aio_write copy write checks in __generic_file_aio_write to ceph_aio_write. To make these checks cover sync write path. Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com> Reviewed-by: Alex Elder <elder@inktank.com>
2013-04-12 16:11:13 +08:00
if (written >= 0 &&
ceph: don't early drop Fw cap ceph_aio_write() has an optimization that marks CEPH_CAP_FILE_WR cap dirty before data is copied to page cache and inode size is updated. The optimization avoids slow cap revocation caused by balance_dirty_pages(), but introduces inode size update race. If ceph_check_caps() flushes the dirty cap before the inode size is updated, MDS can miss the new inode size. So just remove the optimization. Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com> Reviewed-by: Greg Farnum <greg@inktank.com>
2013-03-01 10:55:39 +08:00
((file->f_flags & O_SYNC) || IS_SYNC(file->f_mapping->host) ||
ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_NEARFULL))) {
ceph: apply write checks in ceph_aio_write copy write checks in __generic_file_aio_write to ceph_aio_write. To make these checks cover sync write path. Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com> Reviewed-by: Alex Elder <elder@inktank.com>
2013-04-12 16:11:13 +08:00
err = vfs_fsync_range(file, pos, pos + written - 1, 1);
ceph: don't early drop Fw cap ceph_aio_write() has an optimization that marks CEPH_CAP_FILE_WR cap dirty before data is copied to page cache and inode size is updated. The optimization avoids slow cap revocation caused by balance_dirty_pages(), but introduces inode size update race. If ceph_check_caps() flushes the dirty cap before the inode size is updated, MDS can miss the new inode size. So just remove the optimization. Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com> Reviewed-by: Greg Farnum <greg@inktank.com>
2013-03-01 10:55:39 +08:00
if (err < 0)
ceph: apply write checks in ceph_aio_write copy write checks in __generic_file_aio_write to ceph_aio_write. To make these checks cover sync write path. Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com> Reviewed-by: Alex Elder <elder@inktank.com>
2013-04-12 16:11:13 +08:00
written = err;
ceph: don't early drop Fw cap ceph_aio_write() has an optimization that marks CEPH_CAP_FILE_WR cap dirty before data is copied to page cache and inode size is updated. The optimization avoids slow cap revocation caused by balance_dirty_pages(), but introduces inode size update race. If ceph_check_caps() flushes the dirty cap before the inode size is updated, MDS can miss the new inode size. So just remove the optimization. Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com> Reviewed-by: Greg Farnum <greg@inktank.com>
2013-03-01 10:55:39 +08:00
}
ceph: apply write checks in ceph_aio_write copy write checks in __generic_file_aio_write to ceph_aio_write. To make these checks cover sync write path. Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com> Reviewed-by: Alex Elder <elder@inktank.com>
2013-04-12 16:11:13 +08:00
ceph: replace hold_mutex flag with goto All of the early exit paths need to drop the mutex; it is only the normal path through the function that does not. Skip the unlock in that case with a goto out_unlocked. Signed-off-by: Sage Weil <sage@inktank.com> Reviewed-by: Jianpeng Ma <majianpeng@gmail.com>
2013-08-10 00:57:58 +08:00
goto out_unlocked;
ceph: apply write checks in ceph_aio_write copy write checks in __generic_file_aio_write to ceph_aio_write. To make these checks cover sync write path. Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com> Reviewed-by: Alex Elder <elder@inktank.com>
2013-04-12 16:11:13 +08:00
out:
ceph: replace hold_mutex flag with goto All of the early exit paths need to drop the mutex; it is only the normal path through the function that does not. Skip the unlock in that case with a goto out_unlocked. Signed-off-by: Sage Weil <sage@inktank.com> Reviewed-by: Jianpeng Ma <majianpeng@gmail.com>
2013-08-10 00:57:58 +08:00
mutex_unlock(&inode->i_mutex);
out_unlocked:
ceph: apply write checks in ceph_aio_write copy write checks in __generic_file_aio_write to ceph_aio_write. To make these checks cover sync write path. Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com> Reviewed-by: Alex Elder <elder@inktank.com>
2013-04-12 16:11:13 +08:00
current->backing_dev_info = NULL;
return written ? written : err;
ceph: file operations File open and close operations, and read and write methods that ensure we have obtained the proper capabilities from the MDS cluster before performing IO on a file. We take references on held capabilities for the duration of the read/write to avoid prematurely releasing them back to the MDS. We implement two main paths for read and write: one that is buffered (and uses generic_aio_{read,write}), and one that is fully synchronous and blocking (operating either on a __user pointer or, if O_DIRECT, directly on user pages). Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-07 02:31:08 +08:00
}
/*
* llseek. be sure to verify file size on SEEK_END.
*/
lseek: the "whence" argument is called "whence" But the kernel decided to call it "origin" instead. Fix most of the sites. Acked-by: Hugh Dickins <hughd@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2012-12-18 07:59:39 +08:00
static loff_t ceph_llseek(struct file *file, loff_t offset, int whence)
ceph: file operations File open and close operations, and read and write methods that ensure we have obtained the proper capabilities from the MDS cluster before performing IO on a file. We take references on held capabilities for the duration of the read/write to avoid prematurely releasing them back to the MDS. We implement two main paths for read and write: one that is buffered (and uses generic_aio_{read,write}), and one that is fully synchronous and blocking (operating either on a __user pointer or, if O_DIRECT, directly on user pages). Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-07 02:31:08 +08:00
{
struct inode *inode = file->f_mapping->host;
int ret;
mutex_lock(&inode->i_mutex);
ceph: fix SEEK_CUR, SEEK_SET regression Commit 06222e491e663dac939f04b125c9dc52126a75c4 got the if wrong so that it always evaluates as true. This is semantically harmless, but makes SEEK_CUR and SEEK_SET needlessly query the server. Rewrite the if to explicitly enumerate the cases we DO need a valid i_size to make this code less fragile. Reported-by: Roel Kluin <roel.kluin@gmail.com> Signed-off-by: Sage Weil <sage@newdream.net>
2011-12-14 01:19:26 +08:00
lseek: the "whence" argument is called "whence" But the kernel decided to call it "origin" instead. Fix most of the sites. Acked-by: Hugh Dickins <hughd@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2012-12-18 07:59:39 +08:00
if (whence == SEEK_END || whence == SEEK_DATA || whence == SEEK_HOLE) {
ceph: file operations File open and close operations, and read and write methods that ensure we have obtained the proper capabilities from the MDS cluster before performing IO on a file. We take references on held capabilities for the duration of the read/write to avoid prematurely releasing them back to the MDS. We implement two main paths for read and write: one that is buffered (and uses generic_aio_{read,write}), and one that is fully synchronous and blocking (operating either on a __user pointer or, if O_DIRECT, directly on user pages). Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-07 02:31:08 +08:00
ret = ceph_do_getattr(inode, CEPH_STAT_CAP_SIZE);
if (ret < 0) {
offset = ret;
goto out;
}
fs: handle SEEK_HOLE/SEEK_DATA properly in all fs's that define their own llseek This converts everybody to handle SEEK_HOLE/SEEK_DATA properly. In some cases we just return -EINVAL, in others we do the normal generic thing, and in others we're simply making sure that the properly due-dilligence is done. For example in NFS/CIFS we need to make sure the file size is update properly for the SEEK_HOLE and SEEK_DATA case, but since it calls the generic llseek stuff itself that is all we have to do. Thanks, Signed-off-by: Josef Bacik <josef@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2011-07-19 01:21:38 +08:00
}
lseek: the "whence" argument is called "whence" But the kernel decided to call it "origin" instead. Fix most of the sites. Acked-by: Hugh Dickins <hughd@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2012-12-18 07:59:39 +08:00
switch (whence) {
fs: handle SEEK_HOLE/SEEK_DATA properly in all fs's that define their own llseek This converts everybody to handle SEEK_HOLE/SEEK_DATA properly. In some cases we just return -EINVAL, in others we do the normal generic thing, and in others we're simply making sure that the properly due-dilligence is done. For example in NFS/CIFS we need to make sure the file size is update properly for the SEEK_HOLE and SEEK_DATA case, but since it calls the generic llseek stuff itself that is all we have to do. Thanks, Signed-off-by: Josef Bacik <josef@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2011-07-19 01:21:38 +08:00
case SEEK_END:
ceph: file operations File open and close operations, and read and write methods that ensure we have obtained the proper capabilities from the MDS cluster before performing IO on a file. We take references on held capabilities for the duration of the read/write to avoid prematurely releasing them back to the MDS. We implement two main paths for read and write: one that is buffered (and uses generic_aio_{read,write}), and one that is fully synchronous and blocking (operating either on a __user pointer or, if O_DIRECT, directly on user pages). Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-07 02:31:08 +08:00
offset += inode->i_size;
break;
case SEEK_CUR:
/*
* Here we special-case the lseek(fd, 0, SEEK_CUR)
* position-querying operation. Avoid rewriting the "same"
* f_pos value back to the file because a concurrent read(),
* write() or lseek() might have altered it
*/
if (offset == 0) {
offset = file->f_pos;
goto out;
}
offset += file->f_pos;
break;
fs: handle SEEK_HOLE/SEEK_DATA properly in all fs's that define their own llseek This converts everybody to handle SEEK_HOLE/SEEK_DATA properly. In some cases we just return -EINVAL, in others we do the normal generic thing, and in others we're simply making sure that the properly due-dilligence is done. For example in NFS/CIFS we need to make sure the file size is update properly for the SEEK_HOLE and SEEK_DATA case, but since it calls the generic llseek stuff itself that is all we have to do. Thanks, Signed-off-by: Josef Bacik <josef@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2011-07-19 01:21:38 +08:00
case SEEK_DATA:
if (offset >= inode->i_size) {
ret = -ENXIO;
goto out;
}
break;
case SEEK_HOLE:
if (offset >= inode->i_size) {
ret = -ENXIO;
goto out;
}
offset = inode->i_size;
break;
ceph: file operations File open and close operations, and read and write methods that ensure we have obtained the proper capabilities from the MDS cluster before performing IO on a file. We take references on held capabilities for the duration of the read/write to avoid prematurely releasing them back to the MDS. We implement two main paths for read and write: one that is buffered (and uses generic_aio_{read,write}), and one that is fully synchronous and blocking (operating either on a __user pointer or, if O_DIRECT, directly on user pages). Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-07 02:31:08 +08:00
}
vfs: export lseek_execute() to modules For those file systems(btrfs/ext4/ocfs2/tmpfs) that support SEEK_DATA/SEEK_HOLE functions, we end up handling the similar matter in lseek_execute() to update the current file offset to the desired offset if it is valid, ceph also does the simliar things at ceph_llseek(). To reduce the duplications, this patch make lseek_execute() public accessible so that we can call it directly from the underlying file systems. Thanks Dave Chinner for this suggestion. [AV: call it vfs_setpos(), don't bring the removed 'inode' argument back] v2->v1: - Add kernel-doc comments for lseek_execute() - Call lseek_execute() in ceph->llseek() Signed-off-by: Jie Liu <jeff.liu@oracle.com> Cc: Dave Chinner <dchinner@redhat.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Andi Kleen <andi@firstfloor.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Christoph Hellwig <hch@lst.de> Cc: Chris Mason <chris.mason@fusionio.com> Cc: Josef Bacik <jbacik@fusionio.com> Cc: Ben Myers <bpm@sgi.com> Cc: Ted Tso <tytso@mit.edu> Cc: Hugh Dickins <hughd@google.com> Cc: Mark Fasheh <mfasheh@suse.com> Cc: Joel Becker <jlbec@evilplan.org> Cc: Sage Weil <sage@inktank.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-06-25 12:02:13 +08:00
offset = vfs_setpos(file, offset, inode->i_sb->s_maxbytes);
ceph: file operations File open and close operations, and read and write methods that ensure we have obtained the proper capabilities from the MDS cluster before performing IO on a file. We take references on held capabilities for the duration of the read/write to avoid prematurely releasing them back to the MDS. We implement two main paths for read and write: one that is buffered (and uses generic_aio_{read,write}), and one that is fully synchronous and blocking (operating either on a __user pointer or, if O_DIRECT, directly on user pages). Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-07 02:31:08 +08:00
out:
mutex_unlock(&inode->i_mutex);
return offset;
}
ceph: punch hole support This patch implements fallocate and punch hole support for Ceph kernel client. Signed-off-by: Li Wang <liwang@ubuntukylin.com> Signed-off-by: Yunchuan Wen <yunchuanwen@ubuntukylin.com>
2013-08-15 11:51:44 +08:00
static inline void ceph_zero_partial_page(
struct inode *inode, loff_t offset, unsigned size)
{
struct page *page;
pgoff_t index = offset >> PAGE_CACHE_SHIFT;
page = find_lock_page(inode->i_mapping, index);
if (page) {
wait_on_page_writeback(page);
zero_user(page, offset & (PAGE_CACHE_SIZE - 1), size);
unlock_page(page);
page_cache_release(page);
}
}
static void ceph_zero_pagecache_range(struct inode *inode, loff_t offset,
loff_t length)
{
loff_t nearly = round_up(offset, PAGE_CACHE_SIZE);
if (offset < nearly) {
loff_t size = nearly - offset;
if (length < size)
size = length;
ceph_zero_partial_page(inode, offset, size);
offset += size;
length -= size;
}
if (length >= PAGE_CACHE_SIZE) {
loff_t size = round_down(length, PAGE_CACHE_SIZE);
truncate_pagecache_range(inode, offset, offset + size - 1);
offset += size;
length -= size;
}
if (length)
ceph_zero_partial_page(inode, offset, length);
}
static int ceph_zero_partial_object(struct inode *inode,
loff_t offset, loff_t *length)
{
struct ceph_inode_info *ci = ceph_inode(inode);
struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
struct ceph_osd_request *req;
int ret = 0;
loff_t zero = 0;
int op;
if (!length) {
op = offset ? CEPH_OSD_OP_DELETE : CEPH_OSD_OP_TRUNCATE;
length = &zero;
} else {
op = CEPH_OSD_OP_ZERO;
}
req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
ceph_vino(inode),
offset, length,
1, op,
CEPH_OSD_FLAG_WRITE |
CEPH_OSD_FLAG_ONDISK,
NULL, 0, 0, false);
if (IS_ERR(req)) {
ret = PTR_ERR(req);
goto out;
}
ceph_osdc_build_request(req, offset, NULL, ceph_vino(inode).snap,
&inode->i_mtime);
ret = ceph_osdc_start_request(&fsc->client->osdc, req, false);
if (!ret) {
ret = ceph_osdc_wait_request(&fsc->client->osdc, req);
if (ret == -ENOENT)
ret = 0;
}
ceph_osdc_put_request(req);
out:
return ret;
}
static int ceph_zero_objects(struct inode *inode, loff_t offset, loff_t length)
{
int ret = 0;
struct ceph_inode_info *ci = ceph_inode(inode);
ceph: fix fallocate division We need to use do_div to divide by a 64-bit value. Signed-off-by: Sage Weil <sage@inktank.com> Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
2013-08-28 03:15:16 +08:00
s32 stripe_unit = ceph_file_layout_su(ci->i_layout);
s32 stripe_count = ceph_file_layout_stripe_count(ci->i_layout);
s32 object_size = ceph_file_layout_object_size(ci->i_layout);
u64 object_set_size = object_size * stripe_count;
u64 nearly, t;
/* round offset up to next period boundary */
nearly = offset + object_set_size - 1;
t = nearly;
nearly -= do_div(t, object_set_size);
ceph: punch hole support This patch implements fallocate and punch hole support for Ceph kernel client. Signed-off-by: Li Wang <liwang@ubuntukylin.com> Signed-off-by: Yunchuan Wen <yunchuanwen@ubuntukylin.com>
2013-08-15 11:51:44 +08:00
while (length && offset < nearly) {
loff_t size = length;
ret = ceph_zero_partial_object(inode, offset, &size);
if (ret < 0)
return ret;
offset += size;
length -= size;
}
while (length >= object_set_size) {
int i;
loff_t pos = offset;
for (i = 0; i < stripe_count; ++i) {
ret = ceph_zero_partial_object(inode, pos, NULL);
if (ret < 0)
return ret;
pos += stripe_unit;
}
offset += object_set_size;
length -= object_set_size;
}
while (length) {
loff_t size = length;
ret = ceph_zero_partial_object(inode, offset, &size);
if (ret < 0)
return ret;
offset += size;
length -= size;
}
return ret;
}
static long ceph_fallocate(struct file *file, int mode,
loff_t offset, loff_t length)
{
struct ceph_file_info *fi = file->private_data;
struct inode *inode = file->f_dentry->d_inode;
struct ceph_inode_info *ci = ceph_inode(inode);
struct ceph_osd_client *osdc =
&ceph_inode_to_client(inode)->client->osdc;
int want, got = 0;
int dirty;
int ret = 0;
loff_t endoff = 0;
loff_t size;
if (!S_ISREG(inode->i_mode))
return -EOPNOTSUPP;
if (IS_SWAPFILE(inode))
return -ETXTBSY;
mutex_lock(&inode->i_mutex);
if (ceph_snap(inode) != CEPH_NOSNAP) {
ret = -EROFS;
goto unlock;
}
if (ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_FULL) &&
!(mode & FALLOC_FL_PUNCH_HOLE)) {
ret = -ENOSPC;
goto unlock;
}
size = i_size_read(inode);
if (!(mode & FALLOC_FL_KEEP_SIZE))
endoff = offset + length;
if (fi->fmode & CEPH_FILE_MODE_LAZY)
want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO;
else
want = CEPH_CAP_FILE_BUFFER;
ret = ceph_get_caps(ci, CEPH_CAP_FILE_WR, want, &got, endoff);
if (ret < 0)
goto unlock;
if (mode & FALLOC_FL_PUNCH_HOLE) {
if (offset < size)
ceph_zero_pagecache_range(inode, offset, length);
ret = ceph_zero_objects(inode, offset, length);
} else if (endoff > size) {
truncate_pagecache_range(inode, size, -1);
if (ceph_inode_set_size(inode, endoff))
ceph_check_caps(ceph_inode(inode),
CHECK_CAPS_AUTHONLY, NULL);
}
if (!ret) {
spin_lock(&ci->i_ceph_lock);
dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR);
spin_unlock(&ci->i_ceph_lock);
if (dirty)
__mark_inode_dirty(inode, dirty);
}
ceph_put_cap_refs(ci, got);
unlock:
mutex_unlock(&inode->i_mutex);
return ret;
}
ceph: file operations File open and close operations, and read and write methods that ensure we have obtained the proper capabilities from the MDS cluster before performing IO on a file. We take references on held capabilities for the duration of the read/write to avoid prematurely releasing them back to the MDS. We implement two main paths for read and write: one that is buffered (and uses generic_aio_{read,write}), and one that is fully synchronous and blocking (operating either on a __user pointer or, if O_DIRECT, directly on user pages). Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-07 02:31:08 +08:00
const struct file_operations ceph_file_fops = {
.open = ceph_open,
.release = ceph_release,
.llseek = ceph_llseek,
.read = do_sync_read,
.write = do_sync_write,
.aio_read = ceph_aio_read,
.aio_write = ceph_aio_write,
.mmap = ceph_mmap,
.fsync = ceph_fsync,
ceph: add flock/fcntl lock support Implement flock inode operation to support advisory file locking. All lock/unlock operations are synchronous with the MDS. Lock state is sent when reconnecting to a recovering MDS to restore the shared lock state. Signed-off-by: Greg Farnum <gregf@hq.newdream.net> Signed-off-by: Sage Weil <sage@newdream.net>
2010-08-03 06:34:23 +08:00
.lock = ceph_lock,
.flock = ceph_flock,
ceph: file operations File open and close operations, and read and write methods that ensure we have obtained the proper capabilities from the MDS cluster before performing IO on a file. We take references on held capabilities for the duration of the read/write to avoid prematurely releasing them back to the MDS. We implement two main paths for read and write: one that is buffered (and uses generic_aio_{read,write}), and one that is fully synchronous and blocking (operating either on a __user pointer or, if O_DIRECT, directly on user pages). Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-07 02:31:08 +08:00
.splice_read = generic_file_splice_read,
.splice_write = generic_file_splice_write,
.unlocked_ioctl = ceph_ioctl,
.compat_ioctl = ceph_ioctl,
ceph: punch hole support This patch implements fallocate and punch hole support for Ceph kernel client. Signed-off-by: Li Wang <liwang@ubuntukylin.com> Signed-off-by: Yunchuan Wen <yunchuanwen@ubuntukylin.com>
2013-08-15 11:51:44 +08:00
.fallocate = ceph_fallocate,
ceph: file operations File open and close operations, and read and write methods that ensure we have obtained the proper capabilities from the MDS cluster before performing IO on a file. We take references on held capabilities for the duration of the read/write to avoid prematurely releasing them back to the MDS. We implement two main paths for read and write: one that is buffered (and uses generic_aio_{read,write}), and one that is fully synchronous and blocking (operating either on a __user pointer or, if O_DIRECT, directly on user pages). Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-07 02:31:08 +08:00
};