diff options
| author | Miklos Szeredi <mszeredi@suse.cz> | 2008-07-25 01:48:58 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2008-07-25 10:53:48 -0700 |
| commit | 764c76b371722e0cba5c24d91225f0f954b69d44 (patch) | |
| tree | 3f9bd533878f502b1235194b50a101a84a7c68be | |
| parent | b648a6de00770cc325c22f43bdd4e935f6a2ee55 (diff) | |
locks: allow ->lock() to return FILE_LOCK_DEFERRED
Allow filesystem's ->lock() method to call posix_lock_file() instead of
posix_lock_file_wait(), and return FILE_LOCK_DEFERRED. This makes it
possible to implement a such a ->lock() function, that works with the lock
manager, which needs the call to be asynchronous.
Now the vfs_lock_file() helper can be used, so this is a cleanup as well.
Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
Cc: "J. Bruce Fields" <bfields@fieldses.org>
Cc: Trond Myklebust <trond.myklebust@fys.uio.no>
Cc: Matthew Wilcox <matthew@wil.cx>
Cc: David Teigland <teigland@redhat.com>
Cc: Christoph Hellwig <hch@lst.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | fs/locks.c | 23 |
1 files changed, 9 insertions, 14 deletions
diff --git a/fs/locks.c b/fs/locks.c index 6222e4b580e..01490300f7c 100644 --- a/fs/locks.c +++ b/fs/locks.c @@ -1747,21 +1747,16 @@ static int do_lock_file_wait(struct file *filp, unsigned int cmd, if (error) return error; - if (filp->f_op && filp->f_op->lock != NULL) - error = filp->f_op->lock(filp, cmd, fl); - else { - for (;;) { - error = posix_lock_file(filp, fl, NULL); - if (error != FILE_LOCK_DEFERRED) - break; - error = wait_event_interruptible(fl->fl_wait, - !fl->fl_next); - if (!error) - continue; - - locks_delete_block(fl); + for (;;) { + error = vfs_lock_file(filp, cmd, fl, NULL); + if (error != FILE_LOCK_DEFERRED) break; - } + error = wait_event_interruptible(fl->fl_wait, !fl->fl_next); + if (!error) + continue; + + locks_delete_block(fl); + break; } return error; |