locks: add special return value for asynchronous locks
Use a special error value FILE_LOCK_DEFERRED to mean that a locking
operation returned asynchronously. This is returned by
posix_lock_file() for sleeping locks to mean that the lock has been
queued on the block list, and will be woken up when it might become
available and needs to be retried (either fl_lmops->fl_notify() is
called or fl_wait is woken up).
f_op->lock() to mean either the above, or that the filesystem will
call back with fl_lmops->fl_grant() when the result of the locking
operation is known. The filesystem can do this for sleeping as well
as non-sleeping locks.
This is to make sure, that return values of -EAGAIN and -EINPROGRESS by
filesystems are not mistaken to mean an asynchronous locking.
This also makes error handling in fs/locks.c and lockd/svclock.c slightly
cleaner.
Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
Cc: Trond Myklebust <trond.myklebust@fys.uio.no>
Cc: "J. Bruce Fields" <bfields@fieldses.org>
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>
diff --git a/fs/locks.c b/fs/locks.c
index dce8c747..1ce57b4 100644
--- a/fs/locks.c
+++ b/fs/locks.c
@@ -779,8 +779,10 @@
if (!flock_locks_conflict(request, fl))
continue;
error = -EAGAIN;
- if (request->fl_flags & FL_SLEEP)
- locks_insert_block(fl, request);
+ if (!(request->fl_flags & FL_SLEEP))
+ goto out;
+ error = FILE_LOCK_DEFERRED;
+ locks_insert_block(fl, request);
goto out;
}
if (request->fl_flags & FL_ACCESS)
@@ -836,7 +838,7 @@
error = -EDEADLK;
if (posix_locks_deadlock(request, fl))
goto out;
- error = -EAGAIN;
+ error = FILE_LOCK_DEFERRED;
locks_insert_block(fl, request);
goto out;
}
@@ -1035,7 +1037,7 @@
might_sleep ();
for (;;) {
error = posix_lock_file(filp, fl, NULL);
- if ((error != -EAGAIN) || !(fl->fl_flags & FL_SLEEP))
+ if (error != FILE_LOCK_DEFERRED)
break;
error = wait_event_interruptible(fl->fl_wait, !fl->fl_next);
if (!error)
@@ -1107,9 +1109,7 @@
for (;;) {
error = __posix_lock_file(inode, &fl, NULL);
- if (error != -EAGAIN)
- break;
- if (!(fl.fl_flags & FL_SLEEP))
+ if (error != FILE_LOCK_DEFERRED)
break;
error = wait_event_interruptible(fl.fl_wait, !fl.fl_next);
if (!error) {
@@ -1531,7 +1531,7 @@
might_sleep();
for (;;) {
error = flock_lock_file(filp, fl);
- if ((error != -EAGAIN) || !(fl->fl_flags & FL_SLEEP))
+ if (error != FILE_LOCK_DEFERRED)
break;
error = wait_event_interruptible(fl->fl_wait, !fl->fl_next);
if (!error)
@@ -1716,17 +1716,17 @@
* fl_grant is set. Callers expecting ->lock() to return asynchronously
* will only use F_SETLK, not F_SETLKW; they will set FL_SLEEP if (and only if)
* the request is for a blocking lock. When ->lock() does return asynchronously,
- * it must return -EINPROGRESS, and call ->fl_grant() when the lock
+ * it must return FILE_LOCK_DEFERRED, and call ->fl_grant() when the lock
* request completes.
* If the request is for non-blocking lock the file system should return
- * -EINPROGRESS then try to get the lock and call the callback routine with
- * the result. If the request timed out the callback routine will return a
+ * FILE_LOCK_DEFERRED then try to get the lock and call the callback routine
+ * with the result. If the request timed out the callback routine will return a
* nonzero return code and the file system should release the lock. The file
* system is also responsible to keep a corresponding posix lock when it
* grants a lock so the VFS can find out which locks are locally held and do
* the correct lock cleanup when required.
* The underlying filesystem must not drop the kernel lock or call
- * ->fl_grant() before returning to the caller with a -EINPROGRESS
+ * ->fl_grant() before returning to the caller with a FILE_LOCK_DEFERRED
* return code.
*/
int vfs_lock_file(struct file *filp, unsigned int cmd, struct file_lock *fl, struct file_lock *conf)
@@ -1804,7 +1804,7 @@
else {
for (;;) {
error = posix_lock_file(filp, file_lock, NULL);
- if (error != -EAGAIN || cmd == F_SETLK)
+ if (error != FILE_LOCK_DEFERRED)
break;
error = wait_event_interruptible(file_lock->fl_wait,
!file_lock->fl_next);
@@ -1941,7 +1941,7 @@
else {
for (;;) {
error = posix_lock_file(filp, file_lock, NULL);
- if (error != -EAGAIN || cmd == F_SETLK64)
+ if (error != FILE_LOCK_DEFERRED)
break;
error = wait_event_interruptible(file_lock->fl_wait,
!file_lock->fl_next);