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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>
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@ -5768,6 +5768,9 @@ unsigned long btrfs_full_stripe_len(struct btrfs_fs_info *fs_info,
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struct map_lookup *map;
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unsigned long len = fs_info->sectorsize;
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if (!btrfs_fs_incompat(fs_info, RAID56))
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return len;
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em = btrfs_get_chunk_map(fs_info, logical, len);
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if (!WARN_ON(IS_ERR(em))) {
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@ -5785,6 +5788,9 @@ int btrfs_is_parity_mirror(struct btrfs_fs_info *fs_info, u64 logical, u64 len)
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struct map_lookup *map;
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int ret = 0;
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if (!btrfs_fs_incompat(fs_info, RAID56))
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return 0;
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em = btrfs_get_chunk_map(fs_info, logical, len);
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if(!WARN_ON(IS_ERR(em))) {
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