btrfs: Don't hardcode the csum size in btrfs_ordered_sum_size

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Currently the function uses a hardcoded value for the checksum size of
a sector. This is fine, given that we currently support only a single
algorithm, whose checksum is 4 bytes == sizeof(u32). Despite not
having other algorithms, btrfs' design supports using a different
algorithm whith different space requirements. To future-proof the code
query the size of the currently used algorithm from the in-memory copy
of the super block. No functional changes.

Signed-off-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: Su Yue <suy.fnst@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.com>

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Nikolay Borisov 2018-02-07 11:19:10 +02:00 • committed by David Sterba

parent 97dc231e89

commit af89e0dc2c

1 changed files with 3 additions and 1 deletions

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fs/btrfs/ordered-data.h

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