[PATCH] lockdep: annotate direct io
authorIngo Molnar <mingo@elte.hu>
Mon, 3 Jul 2006 07:25:02 +0000 (00:25 -0700)
committerLinus Torvalds <torvalds@g5.osdl.org>
Mon, 3 Jul 2006 22:27:06 +0000 (15:27 -0700)
Teach special (rwsem-in-irq) locking code to the lock validator.  Has no
effect on non-lockdep kernels.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Cc: Russell King <rmk@arm.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
fs/direct-io.c

index 538fb0418fbab7aba852cc298b5a9ded054935f2..5981e17f46f051afa98ec0b7af67c1b25a0dc897 100644 (file)
@@ -220,7 +220,8 @@ static void dio_complete(struct dio *dio, loff_t offset, ssize_t bytes)
        if (dio->end_io && dio->result)
                dio->end_io(dio->iocb, offset, bytes, dio->map_bh.b_private);
        if (dio->lock_type == DIO_LOCKING)
-               up_read(&dio->inode->i_alloc_sem);
+               /* lockdep: non-owner release */
+               up_read_non_owner(&dio->inode->i_alloc_sem);
 }
 
 /*
@@ -1261,7 +1262,8 @@ __blockdev_direct_IO(int rw, struct kiocb *iocb, struct inode *inode,
                }
 
                if (dio_lock_type == DIO_LOCKING)
-                       down_read(&inode->i_alloc_sem);
+                       /* lockdep: not the owner will release it */
+                       down_read_non_owner(&inode->i_alloc_sem);
        }
 
        /*