875 lines
24 KiB
C
875 lines
24 KiB
C
#include <linux/ceph/ceph_debug.h>
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#include <linux/module.h>
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#include <linux/sched.h>
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#include <linux/slab.h>
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#include <linux/file.h>
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#include <linux/mount.h>
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#include <linux/namei.h>
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#include <linux/writeback.h>
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#include "super.h"
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#include "mds_client.h"
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/*
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* Ceph file operations
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*
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* Implement basic open/close functionality, and implement
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* read/write.
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*
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* We implement three modes of file I/O:
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* - buffered uses the generic_file_aio_{read,write} helpers
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*
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* - synchronous is used when there is multi-client read/write
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* sharing, avoids the page cache, and synchronously waits for an
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* ack from the OSD.
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*
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* - direct io takes the variant of the sync path that references
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* user pages directly.
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*
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* fsync() flushes and waits on dirty pages, but just queues metadata
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* for writeback: since the MDS can recover size and mtime there is no
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* need to wait for MDS acknowledgement.
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*/
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/*
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* Prepare an open request. Preallocate ceph_cap to avoid an
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* inopportune ENOMEM later.
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*/
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static struct ceph_mds_request *
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prepare_open_request(struct super_block *sb, int flags, int create_mode)
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{
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struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
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struct ceph_mds_client *mdsc = fsc->mdsc;
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struct ceph_mds_request *req;
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int want_auth = USE_ANY_MDS;
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int op = (flags & O_CREAT) ? CEPH_MDS_OP_CREATE : CEPH_MDS_OP_OPEN;
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if (flags & (O_WRONLY|O_RDWR|O_CREAT|O_TRUNC))
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want_auth = USE_AUTH_MDS;
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req = ceph_mdsc_create_request(mdsc, op, want_auth);
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if (IS_ERR(req))
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goto out;
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req->r_fmode = ceph_flags_to_mode(flags);
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req->r_args.open.flags = cpu_to_le32(flags);
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req->r_args.open.mode = cpu_to_le32(create_mode);
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out:
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return req;
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}
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/*
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* initialize private struct file data.
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* if we fail, clean up by dropping fmode reference on the ceph_inode
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*/
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static int ceph_init_file(struct inode *inode, struct file *file, int fmode)
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{
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struct ceph_file_info *cf;
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int ret = 0;
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switch (inode->i_mode & S_IFMT) {
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case S_IFREG:
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case S_IFDIR:
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dout("init_file %p %p 0%o (regular)\n", inode, file,
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inode->i_mode);
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cf = kmem_cache_alloc(ceph_file_cachep, GFP_NOFS | __GFP_ZERO);
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if (cf == NULL) {
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ceph_put_fmode(ceph_inode(inode), fmode); /* clean up */
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return -ENOMEM;
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}
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cf->fmode = fmode;
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cf->next_offset = 2;
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file->private_data = cf;
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BUG_ON(inode->i_fop->release != ceph_release);
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break;
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case S_IFLNK:
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dout("init_file %p %p 0%o (symlink)\n", inode, file,
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inode->i_mode);
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ceph_put_fmode(ceph_inode(inode), fmode); /* clean up */
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break;
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default:
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dout("init_file %p %p 0%o (special)\n", inode, file,
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inode->i_mode);
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/*
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* we need to drop the open ref now, since we don't
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* have .release set to ceph_release.
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*/
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ceph_put_fmode(ceph_inode(inode), fmode); /* clean up */
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BUG_ON(inode->i_fop->release == ceph_release);
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/* call the proper open fop */
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ret = inode->i_fop->open(inode, file);
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}
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return ret;
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}
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/*
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* If we already have the requisite capabilities, we can satisfy
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* the open request locally (no need to request new caps from the
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* MDS). We do, however, need to inform the MDS (asynchronously)
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* if our wanted caps set expands.
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*/
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int ceph_open(struct inode *inode, struct file *file)
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{
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struct ceph_inode_info *ci = ceph_inode(inode);
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struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb);
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struct ceph_mds_client *mdsc = fsc->mdsc;
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struct ceph_mds_request *req;
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struct ceph_file_info *cf = file->private_data;
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struct inode *parent_inode = NULL;
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int err;
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int flags, fmode, wanted;
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if (cf) {
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dout("open file %p is already opened\n", file);
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return 0;
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}
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/* filter out O_CREAT|O_EXCL; vfs did that already. yuck. */
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flags = file->f_flags & ~(O_CREAT|O_EXCL);
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if (S_ISDIR(inode->i_mode))
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flags = O_DIRECTORY; /* mds likes to know */
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dout("open inode %p ino %llx.%llx file %p flags %d (%d)\n", inode,
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ceph_vinop(inode), file, flags, file->f_flags);
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fmode = ceph_flags_to_mode(flags);
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wanted = ceph_caps_for_mode(fmode);
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/* snapped files are read-only */
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if (ceph_snap(inode) != CEPH_NOSNAP && (file->f_mode & FMODE_WRITE))
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return -EROFS;
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/* trivially open snapdir */
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if (ceph_snap(inode) == CEPH_SNAPDIR) {
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spin_lock(&ci->i_ceph_lock);
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__ceph_get_fmode(ci, fmode);
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spin_unlock(&ci->i_ceph_lock);
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return ceph_init_file(inode, file, fmode);
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}
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/*
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* No need to block if we have caps on the auth MDS (for
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* write) or any MDS (for read). Update wanted set
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* asynchronously.
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*/
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spin_lock(&ci->i_ceph_lock);
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if (__ceph_is_any_real_caps(ci) &&
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(((fmode & CEPH_FILE_MODE_WR) == 0) || ci->i_auth_cap)) {
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int mds_wanted = __ceph_caps_mds_wanted(ci);
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int issued = __ceph_caps_issued(ci, NULL);
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dout("open %p fmode %d want %s issued %s using existing\n",
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inode, fmode, ceph_cap_string(wanted),
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ceph_cap_string(issued));
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__ceph_get_fmode(ci, fmode);
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spin_unlock(&ci->i_ceph_lock);
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/* adjust wanted? */
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if ((issued & wanted) != wanted &&
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(mds_wanted & wanted) != wanted &&
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ceph_snap(inode) != CEPH_SNAPDIR)
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ceph_check_caps(ci, 0, NULL);
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return ceph_init_file(inode, file, fmode);
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} else if (ceph_snap(inode) != CEPH_NOSNAP &&
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(ci->i_snap_caps & wanted) == wanted) {
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__ceph_get_fmode(ci, fmode);
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spin_unlock(&ci->i_ceph_lock);
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return ceph_init_file(inode, file, fmode);
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}
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spin_unlock(&ci->i_ceph_lock);
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dout("open fmode %d wants %s\n", fmode, ceph_cap_string(wanted));
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req = prepare_open_request(inode->i_sb, flags, 0);
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if (IS_ERR(req)) {
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err = PTR_ERR(req);
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goto out;
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}
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req->r_inode = inode;
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ihold(inode);
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req->r_num_caps = 1;
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if (flags & (O_CREAT|O_TRUNC))
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parent_inode = ceph_get_dentry_parent_inode(file->f_dentry);
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err = ceph_mdsc_do_request(mdsc, parent_inode, req);
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iput(parent_inode);
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if (!err)
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err = ceph_init_file(inode, file, req->r_fmode);
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ceph_mdsc_put_request(req);
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dout("open result=%d on %llx.%llx\n", err, ceph_vinop(inode));
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out:
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return err;
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}
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/*
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* Do a lookup + open with a single request. If we get a non-existent
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* file or symlink, return 1 so the VFS can retry.
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*/
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int ceph_atomic_open(struct inode *dir, struct dentry *dentry,
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struct file *file, unsigned flags, umode_t mode,
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int *opened)
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{
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struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
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struct ceph_mds_client *mdsc = fsc->mdsc;
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struct ceph_mds_request *req;
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struct dentry *dn;
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int err;
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dout("atomic_open %p dentry %p '%.*s' %s flags %d mode 0%o\n",
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dir, dentry, dentry->d_name.len, dentry->d_name.name,
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d_unhashed(dentry) ? "unhashed" : "hashed", flags, mode);
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if (dentry->d_name.len > NAME_MAX)
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return -ENAMETOOLONG;
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err = ceph_init_dentry(dentry);
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if (err < 0)
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return err;
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/* do the open */
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req = prepare_open_request(dir->i_sb, flags, mode);
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if (IS_ERR(req))
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return PTR_ERR(req);
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req->r_dentry = dget(dentry);
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req->r_num_caps = 2;
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if (flags & O_CREAT) {
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req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
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req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
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}
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req->r_locked_dir = dir; /* caller holds dir->i_mutex */
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err = ceph_mdsc_do_request(mdsc,
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(flags & (O_CREAT|O_TRUNC)) ? dir : NULL,
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req);
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if (err)
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goto out_err;
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err = ceph_handle_snapdir(req, dentry, err);
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if (err == 0 && (flags & O_CREAT) && !req->r_reply_info.head->is_dentry)
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err = ceph_handle_notrace_create(dir, dentry);
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if (d_unhashed(dentry)) {
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dn = ceph_finish_lookup(req, dentry, err);
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if (IS_ERR(dn))
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err = PTR_ERR(dn);
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} else {
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/* we were given a hashed negative dentry */
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dn = NULL;
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}
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if (err)
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goto out_err;
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if (dn || dentry->d_inode == NULL || S_ISLNK(dentry->d_inode->i_mode)) {
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/* make vfs retry on splice, ENOENT, or symlink */
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dout("atomic_open finish_no_open on dn %p\n", dn);
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err = finish_no_open(file, dn);
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} else {
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dout("atomic_open finish_open on dn %p\n", dn);
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if (req->r_op == CEPH_MDS_OP_CREATE && req->r_reply_info.has_create_ino) {
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*opened |= FILE_CREATED;
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}
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err = finish_open(file, dentry, ceph_open, opened);
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}
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out_err:
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ceph_mdsc_put_request(req);
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dout("atomic_open result=%d\n", err);
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return err;
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}
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int ceph_release(struct inode *inode, struct file *file)
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{
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struct ceph_inode_info *ci = ceph_inode(inode);
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struct ceph_file_info *cf = file->private_data;
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dout("release inode %p file %p\n", inode, file);
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ceph_put_fmode(ci, cf->fmode);
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if (cf->last_readdir)
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ceph_mdsc_put_request(cf->last_readdir);
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kfree(cf->last_name);
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kfree(cf->dir_info);
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dput(cf->dentry);
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kmem_cache_free(ceph_file_cachep, cf);
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/* wake up anyone waiting for caps on this inode */
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wake_up_all(&ci->i_cap_wq);
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return 0;
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}
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/*
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* Read a range of bytes striped over one or more objects. Iterate over
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* objects we stripe over. (That's not atomic, but good enough for now.)
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*
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* If we get a short result from the OSD, check against i_size; we need to
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* only return a short read to the caller if we hit EOF.
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*/
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static int striped_read(struct inode *inode,
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u64 off, u64 len,
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struct page **pages, int num_pages,
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int *checkeof, bool o_direct,
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unsigned long buf_align)
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{
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struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
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struct ceph_inode_info *ci = ceph_inode(inode);
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u64 pos, this_len;
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int io_align, page_align;
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int left, pages_left;
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int read;
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struct page **page_pos;
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int ret;
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bool hit_stripe, was_short;
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/*
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* we may need to do multiple reads. not atomic, unfortunately.
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*/
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pos = off;
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left = len;
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page_pos = pages;
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pages_left = num_pages;
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read = 0;
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io_align = off & ~PAGE_MASK;
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more:
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if (o_direct)
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page_align = (pos - io_align + buf_align) & ~PAGE_MASK;
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else
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page_align = pos & ~PAGE_MASK;
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this_len = left;
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ret = ceph_osdc_readpages(&fsc->client->osdc, ceph_vino(inode),
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&ci->i_layout, pos, &this_len,
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ci->i_truncate_seq,
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ci->i_truncate_size,
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page_pos, pages_left, page_align);
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if (ret == -ENOENT)
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ret = 0;
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hit_stripe = this_len < left;
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was_short = ret >= 0 && ret < this_len;
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dout("striped_read %llu~%u (read %u) got %d%s%s\n", pos, left, read,
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ret, hit_stripe ? " HITSTRIPE" : "", was_short ? " SHORT" : "");
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if (ret > 0) {
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int didpages = (page_align + ret) >> PAGE_CACHE_SHIFT;
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if (read < pos - off) {
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dout(" zero gap %llu to %llu\n", off + read, pos);
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ceph_zero_page_vector_range(page_align + read,
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pos - off - read, pages);
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}
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pos += ret;
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read = pos - off;
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left -= ret;
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page_pos += didpages;
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pages_left -= didpages;
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/* hit stripe? */
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if (left && hit_stripe)
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goto more;
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}
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if (was_short) {
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/* did we bounce off eof? */
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if (pos + left > inode->i_size)
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*checkeof = 1;
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/* zero trailing bytes (inside i_size) */
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if (left > 0 && pos < inode->i_size) {
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if (pos + left > inode->i_size)
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left = inode->i_size - pos;
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dout("zero tail %d\n", left);
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ceph_zero_page_vector_range(page_align + read, left,
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pages);
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read += left;
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}
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}
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if (ret >= 0)
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ret = read;
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dout("striped_read returns %d\n", ret);
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return ret;
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}
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/*
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* Completely synchronous read and write methods. Direct from __user
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* buffer to osd, or directly to user pages (if O_DIRECT).
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*
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* If the read spans object boundary, just do multiple reads.
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*/
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static ssize_t ceph_sync_read(struct file *file, char __user *data,
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unsigned len, loff_t *poff, int *checkeof)
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{
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struct inode *inode = file_inode(file);
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struct page **pages;
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u64 off = *poff;
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int num_pages, ret;
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dout("sync_read on file %p %llu~%u %s\n", file, off, len,
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(file->f_flags & O_DIRECT) ? "O_DIRECT" : "");
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if (file->f_flags & O_DIRECT) {
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num_pages = calc_pages_for((unsigned long)data, len);
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pages = ceph_get_direct_page_vector(data, num_pages, true);
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} else {
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num_pages = calc_pages_for(off, len);
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pages = ceph_alloc_page_vector(num_pages, GFP_NOFS);
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}
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if (IS_ERR(pages))
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return PTR_ERR(pages);
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/*
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* flush any page cache pages in this range. this
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* will make concurrent normal and sync io slow,
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* but it will at least behave sensibly when they are
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* in sequence.
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*/
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ret = filemap_write_and_wait(inode->i_mapping);
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if (ret < 0)
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goto done;
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ret = striped_read(inode, off, len, pages, num_pages, checkeof,
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file->f_flags & O_DIRECT,
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(unsigned long)data & ~PAGE_MASK);
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if (ret >= 0 && (file->f_flags & O_DIRECT) == 0)
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ret = ceph_copy_page_vector_to_user(pages, data, off, ret);
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if (ret >= 0)
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*poff = off + ret;
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done:
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if (file->f_flags & O_DIRECT)
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ceph_put_page_vector(pages, num_pages, true);
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else
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ceph_release_page_vector(pages, num_pages);
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dout("sync_read result %d\n", ret);
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return ret;
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}
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/*
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* Write commit callback, called if we requested both an ACK and
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* ONDISK commit reply from the OSD.
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*/
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static void sync_write_commit(struct ceph_osd_request *req,
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struct ceph_msg *msg)
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{
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struct ceph_inode_info *ci = ceph_inode(req->r_inode);
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dout("sync_write_commit %p tid %llu\n", req, req->r_tid);
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spin_lock(&ci->i_unsafe_lock);
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list_del_init(&req->r_unsafe_item);
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spin_unlock(&ci->i_unsafe_lock);
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ceph_put_cap_refs(ci, CEPH_CAP_FILE_WR);
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}
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/*
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* Synchronous write, straight from __user pointer or user pages (if
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* O_DIRECT).
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*
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* If write spans object boundary, just do multiple writes. (For a
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* correct atomic write, we should e.g. take write locks on all
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* objects, rollback on failure, etc.)
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*/
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static ssize_t ceph_sync_write(struct file *file, const char __user *data,
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size_t left, loff_t *offset)
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{
|
|
struct inode *inode = file_inode(file);
|
|
struct ceph_inode_info *ci = ceph_inode(inode);
|
|
struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
|
|
struct ceph_osd_request *req;
|
|
struct page **pages;
|
|
int num_pages;
|
|
long long unsigned pos;
|
|
u64 len;
|
|
int written = 0;
|
|
int flags;
|
|
int do_sync = 0;
|
|
int check_caps = 0;
|
|
int page_align, io_align;
|
|
unsigned long buf_align;
|
|
int ret;
|
|
struct timespec mtime = CURRENT_TIME;
|
|
|
|
if (ceph_snap(file_inode(file)) != CEPH_NOSNAP)
|
|
return -EROFS;
|
|
|
|
dout("sync_write on file %p %lld~%u %s\n", file, *offset,
|
|
(unsigned)left, (file->f_flags & O_DIRECT) ? "O_DIRECT" : "");
|
|
|
|
if (file->f_flags & O_APPEND)
|
|
pos = i_size_read(inode);
|
|
else
|
|
pos = *offset;
|
|
|
|
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);
|
|
|
|
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
|
|
do_sync = 1;
|
|
|
|
/*
|
|
* we may need to do multiple writes here if we span an object
|
|
* boundary. this isn't atomic, unfortunately. :(
|
|
*/
|
|
more:
|
|
io_align = pos & ~PAGE_MASK;
|
|
buf_align = (unsigned long)data & ~PAGE_MASK;
|
|
len = left;
|
|
if (file->f_flags & O_DIRECT) {
|
|
/* write from beginning of first page, regardless of
|
|
io alignment */
|
|
page_align = (pos - io_align + buf_align) & ~PAGE_MASK;
|
|
num_pages = calc_pages_for((unsigned long)data, len);
|
|
} else {
|
|
page_align = pos & ~PAGE_MASK;
|
|
num_pages = calc_pages_for(pos, len);
|
|
}
|
|
req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
|
|
ceph_vino(inode), pos, &len,
|
|
CEPH_OSD_OP_WRITE, flags,
|
|
ci->i_snap_realm->cached_context,
|
|
do_sync,
|
|
ci->i_truncate_seq, ci->i_truncate_size,
|
|
&mtime, false, page_align);
|
|
if (IS_ERR(req))
|
|
return PTR_ERR(req);
|
|
|
|
if (file->f_flags & O_DIRECT) {
|
|
pages = ceph_get_direct_page_vector(data, num_pages, false);
|
|
if (IS_ERR(pages)) {
|
|
ret = PTR_ERR(pages);
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* throw out any page cache pages in this range. this
|
|
* may block.
|
|
*/
|
|
truncate_inode_pages_range(inode->i_mapping, pos,
|
|
(pos+len) | (PAGE_CACHE_SIZE-1));
|
|
} else {
|
|
pages = ceph_alloc_page_vector(num_pages, GFP_NOFS);
|
|
if (IS_ERR(pages)) {
|
|
ret = PTR_ERR(pages);
|
|
goto out;
|
|
}
|
|
ret = ceph_copy_user_to_page_vector(pages, data, pos, len);
|
|
if (ret < 0) {
|
|
ceph_release_page_vector(pages, num_pages);
|
|
goto out;
|
|
}
|
|
|
|
if ((file->f_flags & O_SYNC) == 0) {
|
|
/* get a second commit callback */
|
|
req->r_safe_callback = sync_write_commit;
|
|
req->r_own_pages = 1;
|
|
}
|
|
}
|
|
req->r_pages = pages;
|
|
req->r_num_pages = num_pages;
|
|
req->r_inode = inode;
|
|
|
|
ret = ceph_osdc_start_request(&fsc->client->osdc, req, false);
|
|
if (!ret) {
|
|
if (req->r_safe_callback) {
|
|
/*
|
|
* Add to inode unsafe list only after we
|
|
* start_request so that a tid has been assigned.
|
|
*/
|
|
spin_lock(&ci->i_unsafe_lock);
|
|
list_add_tail(&req->r_unsafe_item,
|
|
&ci->i_unsafe_writes);
|
|
spin_unlock(&ci->i_unsafe_lock);
|
|
ceph_get_cap_refs(ci, CEPH_CAP_FILE_WR);
|
|
}
|
|
|
|
ret = ceph_osdc_wait_request(&fsc->client->osdc, req);
|
|
if (ret < 0 && req->r_safe_callback) {
|
|
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);
|
|
}
|
|
}
|
|
|
|
if (file->f_flags & O_DIRECT)
|
|
ceph_put_page_vector(pages, num_pages, false);
|
|
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;
|
|
data += written;
|
|
if (left)
|
|
goto more;
|
|
|
|
ret = written;
|
|
*offset = pos;
|
|
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);
|
|
}
|
|
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;
|
|
struct ceph_file_info *fi = filp->private_data;
|
|
loff_t *ppos = &iocb->ki_pos;
|
|
size_t len = iov->iov_len;
|
|
struct inode *inode = file_inode(filp);
|
|
struct ceph_inode_info *ci = ceph_inode(inode);
|
|
void __user *base = iov->iov_base;
|
|
ssize_t ret;
|
|
int want, got = 0;
|
|
int checkeof = 0, read = 0;
|
|
|
|
dout("aio_read %p %llx.%llx %llu~%u trying to get caps on %p\n",
|
|
inode, ceph_vinop(inode), pos, (unsigned)len, inode);
|
|
again:
|
|
__ceph_do_pending_vmtruncate(inode);
|
|
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);
|
|
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));
|
|
|
|
if ((got & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) == 0 ||
|
|
(iocb->ki_filp->f_flags & O_DIRECT) ||
|
|
(inode->i_sb->s_flags & MS_SYNCHRONOUS) ||
|
|
(fi->flags & CEPH_F_SYNC))
|
|
/* hmm, this isn't really async... */
|
|
ret = ceph_sync_read(filp, base, len, ppos, &checkeof);
|
|
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);
|
|
|
|
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) {
|
|
dout("aio_read sync_read hit hole, ppos %lld < size %lld, reading more\n", *ppos, inode->i_size);
|
|
read += ret;
|
|
base += ret;
|
|
len -= ret;
|
|
checkeof = 0;
|
|
goto again;
|
|
}
|
|
}
|
|
if (ret >= 0)
|
|
ret += read;
|
|
|
|
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;
|
|
struct ceph_file_info *fi = file->private_data;
|
|
struct inode *inode = file_inode(file);
|
|
struct ceph_inode_info *ci = ceph_inode(inode);
|
|
struct ceph_osd_client *osdc =
|
|
&ceph_sb_to_client(inode->i_sb)->client->osdc;
|
|
loff_t endoff = pos + iov->iov_len;
|
|
int got = 0;
|
|
int ret, err, written;
|
|
|
|
if (ceph_snap(inode) != CEPH_NOSNAP)
|
|
return -EROFS;
|
|
|
|
retry_snap:
|
|
written = 0;
|
|
if (ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_FULL))
|
|
return -ENOSPC;
|
|
__ceph_do_pending_vmtruncate(inode);
|
|
|
|
/*
|
|
* try to do a buffered write. if we don't have sufficient
|
|
* caps, we'll get -EAGAIN from generic_file_aio_write, or a
|
|
* short write if we only get caps for some pages.
|
|
*/
|
|
if (!(iocb->ki_filp->f_flags & O_DIRECT) &&
|
|
!(inode->i_sb->s_flags & MS_SYNCHRONOUS) &&
|
|
!(fi->flags & CEPH_F_SYNC)) {
|
|
ret = generic_file_aio_write(iocb, iov, nr_segs, pos);
|
|
if (ret >= 0)
|
|
written = ret;
|
|
|
|
if ((ret >= 0 || ret == -EIOCBQUEUED) &&
|
|
((file->f_flags & O_SYNC) || IS_SYNC(file->f_mapping->host)
|
|
|| ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_NEARFULL))) {
|
|
err = vfs_fsync_range(file, pos, pos + written - 1, 1);
|
|
if (err < 0)
|
|
ret = err;
|
|
}
|
|
if ((ret < 0 && ret != -EAGAIN) || pos + written >= endoff)
|
|
goto out;
|
|
}
|
|
|
|
dout("aio_write %p %llx.%llx %llu~%u getting caps. i_size %llu\n",
|
|
inode, ceph_vinop(inode), pos + written,
|
|
(unsigned)iov->iov_len - written, inode->i_size);
|
|
ret = ceph_get_caps(ci, CEPH_CAP_FILE_WR, 0, &got, endoff);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
dout("aio_write %p %llx.%llx %llu~%u got cap refs on %s\n",
|
|
inode, ceph_vinop(inode), pos + written,
|
|
(unsigned)iov->iov_len - written, ceph_cap_string(got));
|
|
ret = ceph_sync_write(file, iov->iov_base + written,
|
|
iov->iov_len - written, &iocb->ki_pos);
|
|
if (ret >= 0) {
|
|
int dirty;
|
|
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);
|
|
}
|
|
dout("aio_write %p %llx.%llx %llu~%u dropping cap refs on %s\n",
|
|
inode, ceph_vinop(inode), pos + written,
|
|
(unsigned)iov->iov_len - written, ceph_cap_string(got));
|
|
ceph_put_cap_refs(ci, got);
|
|
out:
|
|
if (ret == -EOLDSNAPC) {
|
|
dout("aio_write %p %llx.%llx %llu~%u got EOLDSNAPC, retrying\n",
|
|
inode, ceph_vinop(inode), pos, (unsigned)iov->iov_len);
|
|
goto retry_snap;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* llseek. be sure to verify file size on SEEK_END.
|
|
*/
|
|
static loff_t ceph_llseek(struct file *file, loff_t offset, int whence)
|
|
{
|
|
struct inode *inode = file->f_mapping->host;
|
|
int ret;
|
|
|
|
mutex_lock(&inode->i_mutex);
|
|
__ceph_do_pending_vmtruncate(inode);
|
|
|
|
if (whence == SEEK_END || whence == SEEK_DATA || whence == SEEK_HOLE) {
|
|
ret = ceph_do_getattr(inode, CEPH_STAT_CAP_SIZE);
|
|
if (ret < 0) {
|
|
offset = ret;
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
switch (whence) {
|
|
case SEEK_END:
|
|
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;
|
|
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;
|
|
}
|
|
|
|
if (offset < 0 || offset > inode->i_sb->s_maxbytes) {
|
|
offset = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
/* Special lock needed here? */
|
|
if (offset != file->f_pos) {
|
|
file->f_pos = offset;
|
|
file->f_version = 0;
|
|
}
|
|
|
|
out:
|
|
mutex_unlock(&inode->i_mutex);
|
|
return offset;
|
|
}
|
|
|
|
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,
|
|
.lock = ceph_lock,
|
|
.flock = ceph_flock,
|
|
.splice_read = generic_file_splice_read,
|
|
.splice_write = generic_file_splice_write,
|
|
.unlocked_ioctl = ceph_ioctl,
|
|
.compat_ioctl = ceph_ioctl,
|
|
};
|
|
|