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btrfs: return proper mapped length for RAID56 profiles in __btrfs_map_block()

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For profiles other than RAID56, __btrfs_map_block() returns @map_length
as min(stripe_end, logical + *length), which is also the same result
from btrfs_get_io_geometry().

But for RAID56, __btrfs_map_block() returns @map_length as stripe_len.

This strange behavior is going to hurt incoming bio split at
btrfs_map_bio() time, as we will use @map_length as bio split size.

Fix this behavior by returning @map_length by the same calculation as
for other profiles.

Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Tested-by: Nikolay Borisov <nborisov@suse.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>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Qu Wenruo 2022-06-17 12:04:06 +02:00 committed by David Sterba
parent ff18a4afeb
commit 462b0b2a86
1 changed files with 4 additions and 1 deletions
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5
fs/btrfs/volumes.c
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@ -6471,7 +6471,10 @@ static int __btrfs_map_block(struct btrfs_fs_info *fs_info,
num_stripes = map->num_stripes;
max_errors = btrfs_chunk_max_errors(map);
*length = map->stripe_len;
/* Return the length to the full stripe end */
*length = min(logical + *length,
raid56_full_stripe_start + em->start +
data_stripes * stripe_len) - logical;
stripe_index = 0;
stripe_offset = 0;
} else {