Gitweb: http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=764c76...
Commit: 764c76b371722e0cba5c24d91225f0f954b69d44
Parent: b648a6de00770cc325c22f43bdd4e935f6a2ee55
Author: Miklos Szeredi <mszeredi@suse.cz>
AuthorDate: Fri Jul 25 01:48:58 2008 -0700
Committer: Linus Torvalds <torvalds@linux-foundation.org>
CommitDate: Fri Jul 25 10:53:48 2008 -0700
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>
---
fs/locks.c | 23 +++++++++--------------
1 files changed, 9 insertions(+), 14 deletions(-)
diff --git a/fs/locks.c b/fs/locks.c
index 6222e4b..0149030 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;
--
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