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btrfs: store precalculated csum_size in fs_info

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In many places we need the checksum size and it is inefficient to read
it from the raw superblock. Store the value into fs_info, actual use
will be in followup patches.  The size is u32 as it allows to generate
better assembly than with u16.

Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
David Sterba 2020-07-02 11:10:18 +02:00
parent 265fdfa6ce
commit 22b6331d96
2 changed files with 2 additions and 0 deletions
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1
fs/btrfs/ctree.h
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@ -937,6 +937,7 @@ struct btrfs_fs_info {
u32 sectorsize;
/* ilog2 of sectorsize, use to avoid 64bit division */
u32 sectorsize_bits;
u32 csum_size;
u32 stripesize;
/* Block groups and devices containing active swapfiles. */

1
fs/btrfs/disk-io.c
View file

@ -3080,6 +3080,7 @@ int __cold open_ctree(struct super_block *sb, struct btrfs_fs_devices *fs_device
fs_info->nodesize = nodesize;
fs_info->sectorsize = sectorsize;
fs_info->sectorsize_bits = ilog2(sectorsize);
fs_info->csum_size = btrfs_super_csum_size(disk_super);
fs_info->stripesize = stripesize;
/*