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btrfs: use btrfs_crc32c{,_final}() in for free space cache 

The CRC checksum in the free space cache is not dependant on the super
block's csum_type field but always a CRC32C.

So use btrfs_crc32c() and btrfs_crc32c_final() instead of
btrfs_csum_data() and btrfs_csum_final() for computing these checksums.

Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Signed-off-by: Johannes Thumshirn <jthumshirn@suse.de>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Johannes Thumshirn 2019-05-22 10:19:00 +02:00 committed by David Sterba
parent 65019df8c3
commit 4bb3c2e2b5
1 changed files with 4 additions and 6 deletions
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10
fs/btrfs/free-space-cache.c
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@ -465,9 +465,8 @@ static void io_ctl_set_crc(struct btrfs_io_ctl *io_ctl, int index)
if (index == 0)
offset = sizeof(u32) * io_ctl->num_pages;
crc = btrfs_csum_data(io_ctl->orig + offset, crc,
PAGE_SIZE - offset);
btrfs_csum_final(crc, (u8 *)&crc);
crc = btrfs_crc32c(crc, io_ctl->orig + offset, PAGE_SIZE - offset);
btrfs_crc32c_final(crc, (u8 *)&crc);
io_ctl_unmap_page(io_ctl);
tmp = page_address(io_ctl->pages[0]);
tmp += index;
@ -493,9 +492,8 @@ static int io_ctl_check_crc(struct btrfs_io_ctl *io_ctl, int index)
val = *tmp;
io_ctl_map_page(io_ctl, 0);
crc = btrfs_csum_data(io_ctl->orig + offset, crc,
PAGE_SIZE - offset);
btrfs_csum_final(crc, (u8 *)&crc);
crc = btrfs_crc32c(crc, io_ctl->orig + offset, PAGE_SIZE - offset);
btrfs_crc32c_final(crc, (u8 *)&crc);
if (val != crc) {
btrfs_err_rl(io_ctl->fs_info,
"csum mismatch on free space cache");