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authorMiklos Szeredi <mszeredi@suse.cz>2008-07-25 01:48:57 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-07-25 10:53:47 -0700
commitbde74e4bc64415b142e556a34d295a52a1b7da9d (patch)
treeb6bd229307ccab9b1ad03ffbc75f1f9960cd49e4
parentcc77b1521d06be07c9bb1a4a3e1f775dcaa15093 (diff)
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>
-rw-r--r--fs/dlm/plock.c2
-rw-r--r--fs/lockd/svclock.c13
-rw-r--r--fs/locks.c28
-rw-r--r--include/linux/fs.h6
4 files changed, 25 insertions, 24 deletions
diff --git a/fs/dlm/plock.c b/fs/dlm/plock.c
index 78878c5781c..eba87ff3177 100644
--- a/fs/dlm/plock.c
+++ b/fs/dlm/plock.c
@@ -116,7 +116,7 @@ int dlm_posix_lock(dlm_lockspace_t *lockspace, u64 number, struct file *file,
if (xop->callback == NULL)
wait_event(recv_wq, (op->done != 0));
else {
- rv = -EINPROGRESS;
+ rv = FILE_LOCK_DEFERRED;
goto out;
}
diff --git a/fs/lockd/svclock.c b/fs/lockd/svclock.c
index 821b9acdfb6..cf0d5c2c318 100644
--- a/fs/lockd/svclock.c
+++ b/fs/lockd/svclock.c
@@ -418,8 +418,8 @@ nlmsvc_lock(struct svc_rqst *rqstp, struct nlm_file *file,
goto out;
case -EAGAIN:
ret = nlm_lck_denied;
- break;
- case -EINPROGRESS:
+ goto out;
+ case FILE_LOCK_DEFERRED:
if (wait)
break;
/* Filesystem lock operation is in progress
@@ -434,10 +434,6 @@ nlmsvc_lock(struct svc_rqst *rqstp, struct nlm_file *file,
goto out;
}
- ret = nlm_lck_denied;
- if (!wait)
- goto out;
-
ret = nlm_lck_blocked;
/* Append to list of blocked */
@@ -507,7 +503,7 @@ nlmsvc_testlock(struct svc_rqst *rqstp, struct nlm_file *file,
}
error = vfs_test_lock(file->f_file, &lock->fl);
- if (error == -EINPROGRESS) {
+ if (error == FILE_LOCK_DEFERRED) {
ret = nlmsvc_defer_lock_rqst(rqstp, block);
goto out;
}
@@ -731,8 +727,7 @@ nlmsvc_grant_blocked(struct nlm_block *block)
switch (error) {
case 0:
break;
- case -EAGAIN:
- case -EINPROGRESS:
+ case FILE_LOCK_DEFERRED:
dprintk("lockd: lock still blocked error %d\n", error);
nlmsvc_insert_block(block, NLM_NEVER);
nlmsvc_release_block(block);
diff --git a/fs/locks.c b/fs/locks.c
index dce8c747371..1ce57b4b362 100644
--- a/fs/locks.c
+++ b/fs/locks.c
@@ -779,8 +779,10 @@ find_conflict:
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 @@ static int __posix_lock_file(struct inode *inode, struct file_lock *request, str
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 @@ int posix_lock_file_wait(struct file *filp, struct file_lock *fl)
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 @@ int locks_mandatory_area(int read_write, struct inode *inode,
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 @@ int flock_lock_file_wait(struct file *filp, struct file_lock *fl)
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 @@ out:
* 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 @@ again:
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 @@ again:
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);
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 4b86f806014..49d8eb7a71b 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -886,6 +886,12 @@ static inline int file_check_writeable(struct file *filp)
#define FL_SLEEP 128 /* A blocking lock */
/*
+ * Special return value from posix_lock_file() and vfs_lock_file() for
+ * asynchronous locking.
+ */
+#define FILE_LOCK_DEFERRED 1
+
+/*
* The POSIX file lock owner is determined by
* the "struct files_struct" in the thread group
* (or NULL for no owner - BSD locks).