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fuse: lockd support

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If fuse filesystem doesn't define it's own lock operations, then allow the
lock manager to work with fuse.

Adding lockd support for remote locking is also possible, but more rarely
used, so leave it till later.

Signed-off-by: Miklos Szeredi <[email protected]>
Cc: "J. Bruce Fields" <[email protected]>
Cc: Trond Myklebust <[email protected]>
Cc: Matthew Wilcox <[email protected]>
Cc: David Teigland <[email protected]>
Cc: Christoph Hellwig <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Miklos Szeredi 2008-07-25 01:49:02 -07:00 • committed by Linus Torvalds
commit 48e90761b5
1 changed files with 9 additions and 2 deletions
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11
fs/fuse/file.c
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@ -1341,6 +1341,11 @@ static int fuse_setlk(struct file *file, struct file_lock *fl, int flock)
pid_t pid = fl->fl_type != F_UNLCK ? current->tgid : 0;
int err;
if (fl->fl_lmops && fl->fl_lmops->fl_grant) {
/* NLM needs asynchronous locks, which we don't support yet */
return -ENOLCK;
}
/* Unlock on close is handled by the flush method */
if (fl->fl_flags & FL_CLOSE)
return 0;
@ -1365,7 +1370,9 @@ static int fuse_file_lock(struct file *file, int cmd, struct file_lock *fl)
struct fuse_conn *fc = get_fuse_conn(inode);
int err;
if (cmd == F_GETLK) {
if (cmd == F_CANCELLK) {
err = 0;
} else if (cmd == F_GETLK) {
if (fc->no_lock) {
posix_test_lock(file, fl);
err = 0;
@ -1373,7 +1380,7 @@ static int fuse_file_lock(struct file *file, int cmd, struct file_lock *fl)
err = fuse_getlk(file, fl);
} else {
if (fc->no_lock)
err = posix_lock_file_wait(file, fl);
err = posix_lock_file(file, fl, NULL);
else
err = fuse_setlk(file, fl, 0);
}