Commit b036f479 authored May 22, 2022 by Qu Wenruo Committed by David Sterba Jul 25, 2022

btrfs: quit early if the fs has no RAID56 support for raid56 related checks



The following functions do special handling for RAID56 chunks:

- btrfs_is_parity_mirror()
  Check if the range is in RAID56 chunks.

- btrfs_full_stripe_len()
  Either return sectorsize for non-RAID56 profiles or full stripe length
  for RAID56 chunks.

But if a filesystem without any RAID56 chunks, it will not have RAID56
incompat flags, and we can skip the chunk tree looking up completely.

Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: Anand Jain <anand.jain@oracle.com>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

parent 1280d2d1

fs/btrfs/volumes.c

+6 −0

Original line number	Diff line number	Diff line
		@@ -5768,6 +5768,9 @@ unsigned long btrfs_full_stripe_len(struct btrfs_fs_info *fs_info,
		struct map_lookup *map;
		unsigned long len = fs_info->sectorsize;

		if (!btrfs_fs_incompat(fs_info, RAID56))
		return len;

		em = btrfs_get_chunk_map(fs_info, logical, len);

		if (!WARN_ON(IS_ERR(em))) {
		@@ -5785,6 +5788,9 @@ int btrfs_is_parity_mirror(struct btrfs_fs_info *fs_info, u64 logical, u64 len)
		struct map_lookup *map;
		int ret = 0;

		if (!btrfs_fs_incompat(fs_info, RAID56))
		return 0;

		em = btrfs_get_chunk_map(fs_info, logical, len);

		if(!WARN_ON(IS_ERR(em))) {