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authorKent Overstreet <koverstreet@google.com>2013-04-10 15:50:57 -0700
committerKent Overstreet <koverstreet@google.com>2013-04-20 17:57:42 -0700
commit1545f13730be43278ce12f4af7e51b4dee5066a8 (patch)
treeb1672097ddec583788cc87759b365287fa2b2fa8 /drivers/md/bcache
parentbca97adaf522dff0e9ccf2c3f4150a1a7378932a (diff)
bcache: Correctly check against BIO_MAX_PAGES
bch_bio_max_sectors() was checking against BIO_MAX_PAGES as if the limit was for the total bytes in the bio, not the number of segments. Signed-off-by: Kent Overstreet <koverstreet@google.com>
Diffstat (limited to 'drivers/md/bcache')
-rw-r--r--drivers/md/bcache/io.c9
1 files changed, 4 insertions, 5 deletions
diff --git a/drivers/md/bcache/io.c b/drivers/md/bcache/io.c
index b4c0e28a7cd1..5304eaab6cbe 100644
--- a/drivers/md/bcache/io.c
+++ b/drivers/md/bcache/io.c
@@ -158,8 +158,10 @@ static unsigned bch_bio_max_sectors(struct bio *bio)
{
unsigned ret = bio_sectors(bio);
struct request_queue *q = bdev_get_queue(bio->bi_bdev);
+ unsigned max_segments = min_t(unsigned, BIO_MAX_PAGES,
+ queue_max_segments(q));
struct bio_vec *bv, *end = bio_iovec(bio) +
- min_t(int, bio_segments(bio), queue_max_segments(q));
+ min_t(int, bio_segments(bio), max_segments);
struct bvec_merge_data bvm = {
.bi_bdev = bio->bi_bdev,
@@ -171,7 +173,7 @@ static unsigned bch_bio_max_sectors(struct bio *bio)
if (bio->bi_rw & REQ_DISCARD)
return min(ret, q->limits.max_discard_sectors);
- if (bio_segments(bio) > queue_max_segments(q) ||
+ if (bio_segments(bio) > max_segments ||
q->merge_bvec_fn) {
ret = 0;
@@ -183,9 +185,6 @@ static unsigned bch_bio_max_sectors(struct bio *bio)
ret += bv->bv_len >> 9;
bvm.bi_size += bv->bv_len;
}
-
- if (ret >= (BIO_MAX_PAGES * PAGE_SIZE) >> 9)
- return (BIO_MAX_PAGES * PAGE_SIZE) >> 9;
}
ret = min(ret, queue_max_sectors(q));