diff options
Diffstat (limited to 'fs/btrfs/check-integrity.c')
| -rw-r--r-- | fs/btrfs/check-integrity.c | 14 |
1 files changed, 8 insertions, 6 deletions
diff --git a/fs/btrfs/check-integrity.c b/fs/btrfs/check-integrity.c index 113cb85c1fd4..169508609324 100644 --- a/fs/btrfs/check-integrity.c +++ b/fs/btrfs/check-integrity.c @@ -1555,10 +1555,11 @@ static void btrfsic_release_block_ctx(struct btrfsic_block_data_ctx *block_ctx) BUG_ON(!block_ctx->pagev); num_pages = (block_ctx->len + (u64)PAGE_SIZE - 1) >> PAGE_SHIFT; + /* Pages must be unmapped in reverse order */ while (num_pages > 0) { num_pages--; if (block_ctx->datav[num_pages]) { - kunmap(block_ctx->pagev[num_pages]); + kunmap_local(block_ctx->datav[num_pages]); block_ctx->datav[num_pages] = NULL; } if (block_ctx->pagev[num_pages]) { @@ -1637,7 +1638,7 @@ static int btrfsic_read_block(struct btrfsic_state *state, i = j; } for (i = 0; i < num_pages; i++) - block_ctx->datav[i] = kmap(block_ctx->pagev[i]); + block_ctx->datav[i] = kmap_local_page(block_ctx->pagev[i]); return block_ctx->len; } @@ -2677,7 +2678,7 @@ static void __btrfsic_submit_bio(struct bio *bio) dev_state = btrfsic_dev_state_lookup(bio->bi_bdev->bd_dev); if (NULL != dev_state && (bio_op(bio) == REQ_OP_WRITE) && bio_has_data(bio)) { - unsigned int i = 0; + int i = 0; u64 dev_bytenr; u64 cur_bytenr; struct bio_vec bvec; @@ -2702,7 +2703,7 @@ static void __btrfsic_submit_bio(struct bio *bio) bio_for_each_segment(bvec, bio, iter) { BUG_ON(bvec.bv_len != PAGE_SIZE); - mapped_datav[i] = kmap(bvec.bv_page); + mapped_datav[i] = kmap_local_page(bvec.bv_page); i++; if (dev_state->state->print_mask & @@ -2715,8 +2716,9 @@ static void __btrfsic_submit_bio(struct bio *bio) mapped_datav, segs, bio, &bio_is_patched, bio->bi_opf); - bio_for_each_segment(bvec, bio, iter) - kunmap(bvec.bv_page); + /* Unmap in reverse order */ + for (--i; i >= 0; i--) + kunmap_local(mapped_datav[i]); kfree(mapped_datav); } else if (NULL != dev_state && (bio->bi_opf & REQ_PREFLUSH)) { if (dev_state->state->print_mask & |