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| author | Johannes Thumshirn <jthumshirn@suse.de> | 2019-06-03 16:58:57 +0200 |
|---|---|---|
| committer | David Sterba <dsterba@suse.com> | 2019-07-01 13:35:02 +0200 |
| commit | d5178578bcd461cc79118c7a139882350fe505aa (patch) | |
| tree | b6ee534e6aca76d6aee0c18ecf01fd7b7f576449 /fs/btrfs/inode.c | |
| parent | 6d97c6e31b553bc9f58b83ac3c4c79c17affbda8 (diff) | |
| download | linux-d5178578bcd461cc79118c7a139882350fe505aa.tar.bz2 | |
btrfs: directly call into crypto framework for checksumming
Currently btrfs_csum_data() relied on the crc32c() wrapper around the
crypto framework for calculating the CRCs.
As we have our own crypto_shash structure in the fs_info now, we can
directly call into the crypto framework without going trough the wrapper.
This way we can even remove the btrfs_csum_data() and btrfs_csum_final()
wrappers.
The module dependency on crc32c is preserved via MODULE_SOFTDEP("pre:
crc32c"), which was previously provided by LIBCRC32C config option doing
the same.
Signed-off-by: Johannes Thumshirn <jthumshirn@suse.de>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'fs/btrfs/inode.c')
| -rw-r--r-- | fs/btrfs/inode.c | 23 |
1 files changed, 15 insertions, 8 deletions
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c index 9137bafc9376..3d356a0f8990 100644 --- a/fs/btrfs/inode.c +++ b/fs/btrfs/inode.c @@ -3203,23 +3203,30 @@ static int __readpage_endio_check(struct inode *inode, int icsum, struct page *page, int pgoff, u64 start, size_t len) { + struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); + SHASH_DESC_ON_STACK(shash, fs_info->csum_shash); char *kaddr; - u32 csum_expected; - u32 csum = ~(u32)0; + u16 csum_size = btrfs_super_csum_size(fs_info->super_copy); + u8 *csum_expected; + u8 csum[BTRFS_CSUM_SIZE]; - csum_expected = *(((u32 *)io_bio->csum) + icsum); + csum_expected = ((u8 *)io_bio->csum) + icsum * csum_size; kaddr = kmap_atomic(page); - csum = btrfs_csum_data(kaddr + pgoff, csum, len); - btrfs_csum_final(csum, (u8 *)&csum); - if (csum != csum_expected) + shash->tfm = fs_info->csum_shash; + + crypto_shash_init(shash); + crypto_shash_update(shash, kaddr + pgoff, len); + crypto_shash_final(shash, csum); + + if (memcmp(csum, csum_expected, csum_size)) goto zeroit; kunmap_atomic(kaddr); return 0; zeroit: - btrfs_print_data_csum_error(BTRFS_I(inode), start, csum, csum_expected, - io_bio->mirror_num); + btrfs_print_data_csum_error(BTRFS_I(inode), start, *(u32 *)csum, + *(u32 *)csum_expected, io_bio->mirror_num); memset(kaddr + pgoff, 1, len); flush_dcache_page(page); kunmap_atomic(kaddr); |