From 11b5616516171851b7fcbddc2366aeeef3fa1e53 Mon Sep 17 00:00:00 2001 From: Liu Bo Date: Fri, 14 Apr 2017 16:11:52 -0700 Subject: [PATCH] Btrfs: check-integrity use bvec_iter Some check-integrity code depends on bio->bi_vcnt, this changes it to use bio segments because some bios passing here may not have a reliable bi_vcnt. Signed-off-by: Liu Bo Reviewed-by: David Sterba Signed-off-by: David Sterba --- fs/btrfs/check-integrity.c | 27 +++++++++++++++------------ 1 file changed, 15 insertions(+), 12 deletions(-) diff --git a/fs/btrfs/check-integrity.c b/fs/btrfs/check-integrity.c index 496eb009c41d..6cabc8acee2a 100644 --- a/fs/btrfs/check-integrity.c +++ b/fs/btrfs/check-integrity.c @@ -2816,44 +2816,47 @@ static void __btrfsic_submit_bio(struct bio *bio) dev_state = btrfsic_dev_state_lookup(bio->bi_bdev); if (NULL != dev_state && (bio_op(bio) == REQ_OP_WRITE) && bio_has_data(bio)) { - unsigned int i; + unsigned int i = 0; u64 dev_bytenr; u64 cur_bytenr; - struct bio_vec *bvec; + struct bio_vec bvec; + struct bvec_iter iter; int bio_is_patched; char **mapped_datav; + unsigned int segs = bio_segments(bio); dev_bytenr = 512 * bio->bi_iter.bi_sector; bio_is_patched = 0; if (dev_state->state->print_mask & BTRFSIC_PRINT_MASK_SUBMIT_BIO_BH) pr_info("submit_bio(rw=%d,0x%x, bi_vcnt=%u, bi_sector=%llu (bytenr %llu), bi_bdev=%p)\n", - bio_op(bio), bio->bi_opf, bio->bi_vcnt, + bio_op(bio), bio->bi_opf, segs, (unsigned long long)bio->bi_iter.bi_sector, dev_bytenr, bio->bi_bdev); - mapped_datav = kmalloc_array(bio->bi_vcnt, + mapped_datav = kmalloc_array(segs, sizeof(*mapped_datav), GFP_NOFS); if (!mapped_datav) goto leave; cur_bytenr = dev_bytenr; - bio_for_each_segment_all(bvec, bio, i) { - BUG_ON(bvec->bv_len != PAGE_SIZE); - mapped_datav[i] = kmap(bvec->bv_page); + bio_for_each_segment(bvec, bio, iter) { + BUG_ON(bvec.bv_len != PAGE_SIZE); + mapped_datav[i] = kmap(bvec.bv_page); + i++; if (dev_state->state->print_mask & BTRFSIC_PRINT_MASK_SUBMIT_BIO_BH_VERBOSE) pr_info("#%u: bytenr=%llu, len=%u, offset=%u\n", - i, cur_bytenr, bvec->bv_len, bvec->bv_offset); - cur_bytenr += bvec->bv_len; + i, cur_bytenr, bvec.bv_len, bvec.bv_offset); + cur_bytenr += bvec.bv_len; } btrfsic_process_written_block(dev_state, dev_bytenr, - mapped_datav, bio->bi_vcnt, + mapped_datav, segs, bio, &bio_is_patched, NULL, bio->bi_opf); - bio_for_each_segment_all(bvec, bio, i) - kunmap(bvec->bv_page); + bio_for_each_segment(bvec, bio, iter) + kunmap(bvec.bv_page); kfree(mapped_datav); } else if (NULL != dev_state && (bio->bi_opf & REQ_PREFLUSH)) { if (dev_state->state->print_mask & -- 2.30.2