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btrfs: scrub: limit RST scrub to chunk boundary

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[BUG]
If there is an extent beyond chunk boundary, currently RST scrub would
error out.

[CAUSE]
In scrub_submit_extent_sector_read(), we completely rely on
extent_sector_bitmap, which is populated using extent tree.

The extent tree can be corrupted that there is an extent item beyond a
chunk.

In that case, RST scrub would fail and error out.

[FIX]
Despite the extent_sector_bitmap usage, also limit the read to chunk
boundary.

Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Qu Wenruo 2024-01-17 11:02:26 +10:30 committed by David Sterba
parent f546c42826
commit 7f2d219e78
1 changed files with 7 additions and 0 deletions
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7
fs/btrfs/scrub.c
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@ -1646,6 +1646,9 @@ static void scrub_submit_extent_sector_read(struct scrub_ctx *sctx,
{
struct btrfs_fs_info *fs_info = stripe->bg->fs_info;
struct btrfs_bio *bbio = NULL;
unsigned int nr_sectors = min(BTRFS_STRIPE_LEN, stripe->bg->start +
stripe->bg->length - stripe->logical) >>
fs_info->sectorsize_bits;
u64 stripe_len = BTRFS_STRIPE_LEN;
int mirror = stripe->mirror_num;
int i;
@ -1656,6 +1659,10 @@ static void scrub_submit_extent_sector_read(struct scrub_ctx *sctx,
struct page *page = scrub_stripe_get_page(stripe, i);
unsigned int pgoff = scrub_stripe_get_page_offset(stripe, i);
/* We're beyond the chunk boundary, no need to read anymore. */
if (i >= nr_sectors)
break;
/* The current sector cannot be merged, submit the bio. */
if (bbio &&
((i > 0 &&