On 02/07/2018 05:19 PM, Nikolay Borisov wrote:
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@xxxxxxxx>
Reviewed-by: Su Yue <suy.fnst@xxxxxxxxxxxxxx>
--- fs/btrfs/ordered-data.h | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/fs/btrfs/ordered-data.h b/fs/btrfs/ordered-data.h index 56c4c0ee6381..c53e2cfb72d9 100644 --- a/fs/btrfs/ordered-data.h +++ b/fs/btrfs/ordered-data.h @@ -151,7 +151,9 @@ static inline int btrfs_ordered_sum_size(struct btrfs_fs_info *fs_info, unsigned long bytes) { int num_sectors = (int)DIV_ROUND_UP(bytes, fs_info->sectorsize); - return sizeof(struct btrfs_ordered_sum) + num_sectors * sizeof(u32); + int csum_size = btrfs_super_csum_size(fs_info->super_copy); + + return sizeof(struct btrfs_ordered_sum) + num_sectors * csum_size; }static inline void
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