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authorKent Overstreet <koverstreet@google.com>2012-09-04 15:20:38 -0700
committerKent Overstreet <koverstreet@google.com>2013-03-23 14:15:30 -0700
commit5b83636ae3c3b4f87d02a5929ad4dee831534db0 (patch)
tree90b902fe8797c11d4f76d08353e44bbf82a850e1 /fs/bio.c
parentaa8b57aa3d1c06ca53312294ee6dfc767ee3ddb3 (diff)
downloadlinux-5b83636ae3c3b4f87d02a5929ad4dee831534db0.tar.bz2
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>
Diffstat (limited to 'fs/bio.c')
-rw-r--r--fs/bio.c7
1 files changed, 3 insertions, 4 deletions
diff --git a/fs/bio.c b/fs/bio.c
index 7edc08d2246c..f1b4c1651089 100644
--- a/fs/bio.c
+++ b/fs/bio.c
@@ -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,
bi->bi_sector + first_sectors);
- BUG_ON(bi->bi_vcnt != 1 && bi->bi_vcnt != 0);
- BUG_ON(bi->bi_idx != 0);
+ BUG_ON(bio_segments(bi) > 1);
atomic_set(&bp->cnt, 3);
bp->error = 0;
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;
if (bi->bi_vcnt != 0) {
- bp->bv1 = bi->bi_io_vec[0];
- bp->bv2 = bi->bi_io_vec[0];
+ bp->bv1 = *bio_iovec(bi);
+ bp->bv2 = *bio_iovec(bi);
if (bio_is_rw(bi)) {
bp->bv2.bv_offset += first_sectors << 9;