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Commit 5b83636a authored Sep 04, 2012 by Kent Overstreet

block: Change bio_split() to respect the current value of bi_idx



In the current code bio_split() won't be seeing partially completed bios
so this doesn't change any behaviour, but this makes the code a bit
clearer as to what bio_split() actually requires.

The immediate purpose of the patch is removing unnecessary bi_idx
references, but the end goal is to allow partial completed bios to be
submitted, which along with immutable biovecs enables effecient bio
splitting.

Some of the callers were (double) checking that bios could be split, so
update their checks too.

Signed-off-by: Kent Overstreet <koverstreet@google.com>
CC: Jens Axboe <axboe@kernel.dk>
CC: Lars Ellenberg <drbd-dev@lists.linbit.com>
CC: Neil Brown <neilb@suse.de>
CC: Martin K. Petersen <martin.petersen@oracle.com>

parent aa8b57aa

drivers/md/raid0.c

+1 −2

Original line number	Original line	Diff line number	Diff line
	@@ -527,8 +527,7 @@ static void raid0_make_request(struct mddev mddev, struct bio bio)
	sector_t sector = bio->bi_sector;		sector_t sector = bio->bi_sector;
	struct bio_pair *bp;		struct bio_pair *bp;
	/* Sanity check -- queue functions should prevent this happening */		/* Sanity check -- queue functions should prevent this happening */
	if ((bio->bi_vcnt != 1 && bio->bi_vcnt != 0) \|\|		if (bio_segments(bio) > 1)
	bio->bi_idx != 0)
	goto bad_map;		goto bad_map;
	/* This is a one page bio that upper layers		/* This is a one page bio that upper layers
	* refuse to split for us, so we need to split it.		* refuse to split for us, so we need to split it.

drivers/md/raid10.c

+1 −2

Original line number	Original line	Diff line number	Diff line
	@@ -1175,8 +1175,7 @@ static void make_request(struct mddev mddev, struct bio bio)
	\|\| conf->prev.near_copies < conf->prev.raid_disks))) {		\|\| conf->prev.near_copies < conf->prev.raid_disks))) {
	struct bio_pair *bp;		struct bio_pair *bp;
	/* Sanity check -- queue functions should prevent this happening */		/* Sanity check -- queue functions should prevent this happening */
	if ((bio->bi_vcnt != 1 && bio->bi_vcnt != 0) \|\|		if (bio_segments(bio) > 1)
	bio->bi_idx != 0)
	goto bad_map;		goto bad_map;
	/* This is a one page bio that upper layers		/* This is a one page bio that upper layers
	* refuse to split for us, so we need to split it.		* refuse to split for us, so we need to split it.

fs/bio-integrity.c

+2 −2

Original line number	Original line	Diff line number	Diff line
	@@ -661,8 +661,8 @@ void bio_integrity_split(struct bio bio, struct bio_pair bp, int sectors)
	bp->bio1.bi_integrity = &bp->bip1;		bp->bio1.bi_integrity = &bp->bip1;
	bp->bio2.bi_integrity = &bp->bip2;		bp->bio2.bi_integrity = &bp->bip2;

	bp->iv1 = bip->bip_vec[0];		bp->iv1 = bip->bip_vec[bip->bip_idx];
	bp->iv2 = bip->bip_vec[0];		bp->iv2 = bip->bip_vec[bip->bip_idx];

	bp->bip1.bip_vec = &bp->iv1;		bp->bip1.bip_vec = &bp->iv1;
	bp->bip2.bip_vec = &bp->iv2;		bp->bip2.bip_vec = &bp->iv2;

fs/bio.c

+3 −4

Original line number	Original line	Diff line number	Diff line
	@@ -1620,8 +1620,7 @@ struct bio_pair bio_split(struct bio bi, int first_sectors)
	trace_block_split(bdev_get_queue(bi->bi_bdev), bi,		trace_block_split(bdev_get_queue(bi->bi_bdev), bi,
	bi->bi_sector + first_sectors);		bi->bi_sector + first_sectors);

	BUG_ON(bi->bi_vcnt != 1 && bi->bi_vcnt != 0);		BUG_ON(bio_segments(bi) > 1);
	BUG_ON(bi->bi_idx != 0);
	atomic_set(&bp->cnt, 3);		atomic_set(&bp->cnt, 3);
	bp->error = 0;		bp->error = 0;
	bp->bio1 = *bi;		bp->bio1 = *bi;
	@@ -1631,8 +1630,8 @@ struct bio_pair bio_split(struct bio bi, int first_sectors)
	bp->bio1.bi_size = first_sectors << 9;		bp->bio1.bi_size = first_sectors << 9;

	if (bi->bi_vcnt != 0) {		if (bi->bi_vcnt != 0) {
	bp->bv1 = bi->bi_io_vec[0];		bp->bv1 = *bio_iovec(bi);
	bp->bv2 = bi->bi_io_vec[0];		bp->bv2 = *bio_iovec(bi);

	if (bio_is_rw(bi)) {		if (bio_is_rw(bi)) {
	bp->bv2.bv_offset += first_sectors << 9;		bp->bv2.bv_offset += first_sectors << 9;

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