@@ -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 &&
[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. Signed-off-by: Qu Wenruo <wqu@suse.com> --- fs/btrfs/scrub.c | 7 +++++++ 1 file changed, 7 insertions(+)