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fuse: add blksize field to fuse_attr 

There are cases when the filesystem will be passed the buffer from a single
read or write call, namely:

 1) in 'direct-io' mode (not O_DIRECT), read/write requests don't go
    through the page cache, but go directly to the userspace fs

 2) currently buffered writes are done with single page requests, but
    if Nick's ->perform_write() patch goes it, it will be possible to
    do larger write requests.  But only if the original write() was
    also bigger than a page.

In these cases the filesystem might want to give a hint to the app
about the optimal I/O size.

Allow the userspace filesystem to supply a blksize value to be returned by
stat() and friends.  If the field is zero, it defaults to the old
PAGE_CACHE_SIZE value.

Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Miklos Szeredi 2007-10-18 03:07:05 -07:00 committed by Linus Torvalds
parent f33321141b
commit 0e9663ee45
3 changed files with 39 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

32
fs/fuse/dir.c
View File

@ -116,13 +116,19 @@ static void fuse_lookup_init(struct fuse_req *req, struct inode *dir,
struct dentry *entry,
struct fuse_entry_out *outarg)
{
struct fuse_conn *fc = get_fuse_conn(dir);
memset(outarg, 0, sizeof(struct fuse_entry_out));
req->in.h.opcode = FUSE_LOOKUP;
req->in.h.nodeid = get_node_id(dir);
req->in.numargs = 1;
req->in.args[0].size = entry->d_name.len + 1;
req->in.args[0].value = entry->d_name.name;
req->out.numargs = 1;
req->out.args[0].size = sizeof(struct fuse_entry_out);
if (fc->minor < 9)
req->out.args[0].size = FUSE_COMPAT_ENTRY_OUT_SIZE;
else
req->out.args[0].size = sizeof(struct fuse_entry_out);
req->out.args[0].value = outarg;
}
@ -356,6 +362,7 @@ static int fuse_create_open(struct inode *dir, struct dentry *entry, int mode,
flags &= ~O_NOCTTY;
memset(&inarg, 0, sizeof(inarg));
memset(&outentry, 0, sizeof(outentry));
inarg.flags = flags;
inarg.mode = mode;
req->in.h.opcode = FUSE_CREATE;
@ -366,7 +373,10 @@ static int fuse_create_open(struct inode *dir, struct dentry *entry, int mode,
req->in.args[1].size = entry->d_name.len + 1;
req->in.args[1].value = entry->d_name.name;
req->out.numargs = 2;
req->out.args[0].size = sizeof(outentry);
if (fc->minor < 9)
req->out.args[0].size = FUSE_COMPAT_ENTRY_OUT_SIZE;
else
req->out.args[0].size = sizeof(outentry);
req->out.args[0].value = &outentry;
req->out.args[1].size = sizeof(outopen);
req->out.args[1].value = &outopen;
@ -431,9 +441,13 @@ static int create_new_entry(struct fuse_conn *fc, struct fuse_req *req,
return PTR_ERR(forget_req);
}
memset(&outarg, 0, sizeof(outarg));
req->in.h.nodeid = get_node_id(dir);
req->out.numargs = 1;
req->out.args[0].size = sizeof(outarg);
if (fc->minor < 9)
req->out.args[0].size = FUSE_COMPAT_ENTRY_OUT_SIZE;
else
req->out.args[0].size = sizeof(outarg);
req->out.args[0].value = &outarg;
request_send(fc, req);
err = req->out.h.error;
@ -724,6 +738,7 @@ static int fuse_do_getattr(struct inode *inode, struct kstat *stat,
spin_unlock(&fc->lock);
memset(&inarg, 0, sizeof(inarg));
memset(&outarg, 0, sizeof(outarg));
/* Directories have separate file-handle space */
if (file && S_ISREG(inode->i_mode)) {
struct fuse_file *ff = file->private_data;
@ -737,7 +752,10 @@ static int fuse_do_getattr(struct inode *inode, struct kstat *stat,
req->in.args[0].size = sizeof(inarg);
req->in.args[0].value = &inarg;
req->out.numargs = 1;
req->out.args[0].size = sizeof(outarg);
if (fc->minor < 9)
req->out.args[0].size = FUSE_COMPAT_ATTR_OUT_SIZE;
else
req->out.args[0].size = sizeof(outarg);
req->out.args[0].value = &outarg;
request_send(fc, req);
err = req->out.h.error;
@ -1102,6 +1120,7 @@ static int fuse_do_setattr(struct dentry *entry, struct iattr *attr,
return PTR_ERR(req);
memset(&inarg, 0, sizeof(inarg));
memset(&outarg, 0, sizeof(outarg));
iattr_to_fattr(attr, &inarg);
if (file) {
struct fuse_file *ff = file->private_data;
@ -1119,7 +1138,10 @@ static int fuse_do_setattr(struct dentry *entry, struct iattr *attr,
req->in.args[0].size = sizeof(inarg);
req->in.args[0].value = &inarg;
req->out.numargs = 1;
req->out.args[0].size = sizeof(outarg);
if (fc->minor < 9)
req->out.args[0].size = FUSE_COMPAT_ATTR_OUT_SIZE;
else
req->out.args[0].size = sizeof(outarg);
req->out.args[0].value = &outarg;
request_send(fc, req);
err = req->out.h.error;

5
fs/fuse/inode.c
View File

@ -148,6 +148,11 @@ void fuse_change_attributes(struct inode *inode, struct fuse_attr *attr,
inode->i_ctime.tv_sec = attr->ctime;
inode->i_ctime.tv_nsec = attr->ctimensec;
if (attr->blksize != 0)
inode->i_blkbits = ilog2(attr->blksize);
else
inode->i_blkbits = inode->i_sb->s_blocksize_bits;
/*
* Don't set the sticky bit in i_mode, unless we want the VFS
* to check permissions. This prevents failures due to the

7
include/linux/fuse.h
View File

@ -15,6 +15,7 @@
* - new fuse_getattr_in input argument of GETATTR
* - add lk_flags in fuse_lk_in
* - add lock_owner field to fuse_setattr_in, fuse_read_in and fuse_write_in
* - add blksize field to fuse_attr
*/
#include <asm/types.h>
@ -53,6 +54,8 @@ struct fuse_attr {
__u32 uid;
__u32 gid;
__u32 rdev;
__u32 blksize;
__u32 padding;
};
struct fuse_kstatfs {
@ -177,6 +180,8 @@ enum fuse_opcode {
/* The read buffer is required to be at least 8k, but may be much larger */
#define FUSE_MIN_READ_BUFFER 8192
#define FUSE_COMPAT_ENTRY_OUT_SIZE 120
struct fuse_entry_out {
__u64 nodeid; /* Inode ID */
__u64 generation; /* Inode generation: nodeid:gen must
@ -198,6 +203,8 @@ struct fuse_getattr_in {
__u64 fh;
};
#define FUSE_COMPAT_ATTR_OUT_SIZE 96
struct fuse_attr_out {
__u64 attr_valid; /* Cache timeout for the attributes */
__u32 attr_valid_nsec;