From 9f7cdbc33f36d28e57eaba0093f68f0d14c38c5b Mon Sep 17 00:00:00 2001
From: Dmitry Monakhov <dmonakhov@openvz.org>
Date: Sat, 27 Feb 2010 20:35:12 +0300
Subject: [PATCH] blkdev: fix merge_bvec_fn return value checks
merge_bvec_fn() returns bvec->bv_len on success. So we have to check
against this value. But in case of fs_optimization merge we compare
with wrong value. This patch must be included in
b428cd6da7e6559aca69aa2e3a526037d3f20403
But accidentally i've forgot to add this in the initial patch.
To make things straight let's replace all such checks.
In fact this makes code easy to understand.
Signed-off-by: Dmitry Monakhov <dmonakhov@openvz.org>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
---
fs/bio.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/fs/bio.c b/fs/bio.c
index dc17afd672e354..0bda289f86fc26 100644
--- a/fs/bio.c
+++ b/fs/bio.c
@@ -555,7 +555,7 @@ static int __bio_add_page(struct request_queue *q, struct bio *bio, struct page
.bi_rw = bio->bi_rw,
};
- if (q->merge_bvec_fn(q, &bvm, prev) < len) {
+ if (q->merge_bvec_fn(q, &bvm, prev) != prev->bv_len) {
prev->bv_len -= len;
return 0;
}
@@ -608,7 +608,7 @@ static int __bio_add_page(struct request_queue *q, struct bio *bio, struct page
* merge_bvec_fn() returns number of bytes it can accept
* at this offset
*/
- if (q->merge_bvec_fn(q, &bvm, bvec) < len) {
+ if (q->merge_bvec_fn(q, &bvm, bvec) != bvec->bv_len) {
bvec->bv_page = NULL;
bvec->bv_len = 0;
bvec->bv_offset = 0;
--
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