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Merge branch 'for-linus' of git://git.kernel.dk/linux-block 

Pull block layer fix from Jens Axboe:
 "This just contains the fix for the split issue that we had in -rc1.

  It's been well tested at this point, so let's get it in mainline so we
  don't have the same split issue for -rc2"

* 'for-linus' of git://git.kernel.dk/linux-block:
  block: fix bio splitting on max sectors
This commit is contained in:
Linus Torvalds 2016-01-29 12:56:08 -08:00
parent b54544322e d0e5fbb01a
commit 13d5699007
1 changed files with 19 additions and 7 deletions
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26
block/blk-merge.c
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@ -70,6 +70,18 @@ static struct bio *blk_bio_write_same_split(struct request_queue *q,
return bio_split(bio, q->limits.max_write_same_sectors, GFP_NOIO, bs);
}
static inline unsigned get_max_io_size(struct request_queue *q,
struct bio *bio)
{
unsigned sectors = blk_max_size_offset(q, bio->bi_iter.bi_sector);
unsigned mask = queue_logical_block_size(q) - 1;
/* aligned to logical block size */
sectors &= ~(mask >> 9);
return sectors;
}
static struct bio *blk_bio_segment_split(struct request_queue *q,
struct bio *bio,
struct bio_set *bs,
@ -81,6 +93,7 @@ static struct bio *blk_bio_segment_split(struct request_queue *q,
unsigned front_seg_size = bio->bi_seg_front_size;
bool do_split = true;
struct bio *new = NULL;
const unsigned max_sectors = get_max_io_size(q, bio);
bio_for_each_segment(bv, bio, iter) {
/*
@ -90,20 +103,19 @@ static struct bio *blk_bio_segment_split(struct request_queue *q,
if (bvprvp && bvec_gap_to_prev(q, bvprvp, bv.bv_offset))
goto split;
if (sectors + (bv.bv_len >> 9) >
blk_max_size_offset(q, bio->bi_iter.bi_sector)) {
if (sectors + (bv.bv_len >> 9) > max_sectors) {
/*
* Consider this a new segment if we're splitting in
* the middle of this vector.
*/
if (nsegs < queue_max_segments(q) &&
sectors < blk_max_size_offset(q,
bio->bi_iter.bi_sector)) {
sectors < max_sectors) {
nsegs++;
sectors = blk_max_size_offset(q,
bio->bi_iter.bi_sector);
sectors = max_sectors;
}
goto split;
if (sectors)
goto split;
/* Make this single bvec as the 1st segment */
}
if (bvprvp && blk_queue_cluster(q)) {