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| author | Liu Bo <bo.li.liu@oracle.com> | 2017-08-03 21:53:31 +0200 |
|---|---|---|
| committer | David Sterba <dsterba@suse.com> | 2017-10-30 12:27:55 +0100 |
| commit | 9cd3a7eb8507deb3c75077739a07ccccad0dc991 (patch) | |
| tree | 9f785c4e5f0083f9461fcdb607bd00b346bb8d9b | |
| parent | btrfs: copy fsid to super_block s_uuid (diff) | |
| download | linux-9cd3a7eb8507deb3c75077739a07ccccad0dc991.tar.xz linux-9cd3a7eb8507deb3c75077739a07ccccad0dc991.zip | |
Btrfs: search parity device wisely
After mapping block with BTRFS_MAP_WRITE, parities have been sorted to
the end position, so this search can start from the first parity
stripe.
Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
Reviewed-by: David Sterba <dsterba@suse.com>
[ copied changelog as a comment ]
Signed-off-by: David Sterba <dsterba@suse.com>
| -rw-r--r-- | fs/btrfs/raid56.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/fs/btrfs/raid56.c b/fs/btrfs/raid56.c index 24a62224b24b..cba5e7339462 100644 --- a/fs/btrfs/raid56.c +++ b/fs/btrfs/raid56.c @@ -2231,12 +2231,18 @@ raid56_parity_alloc_scrub_rbio(struct btrfs_fs_info *fs_info, struct bio *bio, ASSERT(!bio->bi_iter.bi_size); rbio->operation = BTRFS_RBIO_PARITY_SCRUB; - for (i = 0; i < rbio->real_stripes; i++) { + /* + * After mapping bbio with BTRFS_MAP_WRITE, parities have been sorted + * to the end position, so this search can start from the first parity + * stripe. + */ + for (i = rbio->nr_data; i < rbio->real_stripes; i++) { if (bbio->stripes[i].dev == scrub_dev) { rbio->scrubp = i; break; } } + ASSERT(i < rbio->real_stripes); /* Now we just support the sectorsize equals to page size */ ASSERT(fs_info->sectorsize == PAGE_SIZE); |