[PATCH] dio: call blk_run_address_space() once per op
We only need to call blk_run_address_space() once after all the bios for the
direct IO op have been submitted. This removes the chance of calling
blk_run_address_space() after spurious wake ups as the sync path waits for
bios to drain. It's also one less difference betwen the sync and async paths.
In the process we remove a redundant dio_bio_submit() that its caller had
already performed.
Signed-off-by: Zach Brown <zach.brown@oracle.com>
Cc: Badari Pulavarty <pbadari@us.ibm.com>
Cc: Suparna Bhattacharya <suparna@in.ibm.com>
Acked-by: Jeff Moyer <jmoyer@redhat.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/fs/direct-io.c b/fs/direct-io.c
index b57b671..b296942 100644
--- a/fs/direct-io.c
+++ b/fs/direct-io.c
@@ -404,7 +404,6 @@
if (dio->bio_list == NULL) {
dio->waiter = current;
spin_unlock_irqrestore(&dio->bio_lock, flags);
- blk_run_address_space(dio->inode->i_mapping);
io_schedule();
spin_lock_irqsave(&dio->bio_lock, flags);
dio->waiter = NULL;
@@ -450,9 +449,6 @@
*/
static void dio_await_completion(struct dio *dio)
{
- if (dio->bio)
- dio_bio_submit(dio);
-
/*
* The bio_lock is not held for the read of bio_count.
* This is ok since it is the dio_bio_complete() that changes
@@ -1085,6 +1081,9 @@
if (dio->bio)
dio_bio_submit(dio);
+ /* All IO is now issued, send it on its way */
+ blk_run_address_space(inode->i_mapping);
+
/*
* It is possible that, we return short IO due to end of file.
* In that case, we need to release all the pages we got hold on.
@@ -1113,7 +1112,6 @@
if (ret == 0)
ret = dio->result;
finished_one_bio(dio); /* This can free the dio */
- blk_run_address_space(inode->i_mapping);
if (should_wait) {
unsigned long flags;
/*