[PATCH] Make ll_rw_block() wait for buffer lock

Introduce new ll_rw_block() operation SWRITE meaning that block layer should
wait for the buffer lock and write-out afterwards.  Hence data in buffers at
the time of call are guaranteed to be submitted to the disk.

Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 1 insertions, 0 deletions

diff --git a/include/linux/fs.h b/include/linux/fs.h
index 7e1b589842af..fd93ab7da905 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -69,6 +69,7 @@ extern int dir_notify_enable;
 #define READ 0
 #define WRITE 1
 #define READA 2         /* read-ahead  - don't block if no resources */
+#define SWRITE 3        /* for ll_rw_block() - wait for buffer lock */
 #define SPECIAL 4       /* For non-blockdevice requests in request queue */
 #define READ_SYNC       (READ | (1 << BIO_RW_SYNC))
 #define WRITE_SYNC      (WRITE | (1 << BIO_RW_SYNC))