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/dlm/plock.c b/fs/dlm/plock.c
index 78878c5781cadc0d13846d8af6a993039d8b39e6..eba87ff3177b6070284ee3eea402fd34c610c657 100644 (file)
--- 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 821b9acdfb66accf6f2428a1eee2b2fcdcaa1620..cf0d5c2c318d6002330f1bca7965b09e8a047e9d 100644 (file)
--- 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 dce8c747371c77e618ee387158c37451daf63c97..1ce57b4b362c85d4d78942e50867e73b589aa9b7 100644 (file)
--- 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 4b86f806014c5e8a82f0664f3e5c9acad0c2d0d0..49d8eb7a71be2b89d9148575618d2550018a5141 100644 (file)
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -885,6 +885,12 @@ static inline int file_check_writeable(struct file *filp)
 #define FL_CLOSE       64      /* unlock on close */
 #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