On 2019/9/26 下午6:11, Johannes Thumshirn wrote:
> Signed-off-by: Johannes Thumshirn <jthumshirn@xxxxxxx>
> ---
Not related to the patchset itself, but it would be pretty nice if we
check the sysfs interface to guess if we can mount the fs.
And if not supported, a warning (at stdout) will not hurt.
Thanks,
Qu
>
> Changes since v5:
> - add xxhash64 to hash table
>
> Makefile | 3 ++-
> cmds/inspect-dump-super.c | 1 +
> crypto/hash.c | 16 ++++++++++++++++
> crypto/hash.h | 10 ++++++++++
> ctree.c | 1 +
> ctree.h | 3 ++-
> disk-io.c | 3 +++
> mkfs/main.c | 3 +++
> 8 files changed, 38 insertions(+), 2 deletions(-)
> create mode 100644 crypto/hash.c
> create mode 100644 crypto/hash.h
>
> diff --git a/Makefile b/Makefile
> index 370e0c37ff65..45530749e2b9 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -151,7 +151,8 @@ cmds_objects = cmds/subvolume.o cmds/filesystem.o cmds/device.o cmds/scrub.o \
> mkfs/common.o check/mode-common.o check/mode-lowmem.o
> libbtrfs_objects = send-stream.o send-utils.o kernel-lib/rbtree.o btrfs-list.o \
> kernel-lib/crc32c.o common/messages.o \
> - uuid-tree.o utils-lib.o common/rbtree-utils.o
> + uuid-tree.o utils-lib.o common/rbtree-utils.o \
> + crypto/hash.o crypto/xxhash.o
> libbtrfs_headers = send-stream.h send-utils.h send.h kernel-lib/rbtree.h btrfs-list.h \
> kernel-lib/crc32c.h kernel-lib/list.h kerncompat.h \
> kernel-lib/radix-tree.h kernel-lib/sizes.h kernel-lib/raid56.h \
> diff --git a/cmds/inspect-dump-super.c b/cmds/inspect-dump-super.c
> index bf380ad2b56a..73e986ed8ee8 100644
> --- a/cmds/inspect-dump-super.c
> +++ b/cmds/inspect-dump-super.c
> @@ -315,6 +315,7 @@ static bool is_valid_csum_type(u16 csum_type)
> {
> switch (csum_type) {
> case BTRFS_CSUM_TYPE_CRC32:
> + case BTRFS_CSUM_TYPE_XXHASH:
> return true;
> default:
> return false;
> diff --git a/crypto/hash.c b/crypto/hash.c
> new file mode 100644
> index 000000000000..8c428cba11f0
> --- /dev/null
> +++ b/crypto/hash.c
> @@ -0,0 +1,16 @@
> +#include "crypto/hash.h"
> +#include "crypto/xxhash.h"
> +
> +int hash_xxhash(const u8 *buf, size_t length, u8 *out)
> +{
> + XXH64_hash_t hash;
> +
> + hash = XXH64(buf, length, 0);
> + /*
> + * NOTE: we're not taking the canonical form here but the plain hash to
> + * be compatible with the kernel implementation!
> + */
> + memcpy(out, &hash, 8);
> +
> + return 0;
> +}
> diff --git a/crypto/hash.h b/crypto/hash.h
> new file mode 100644
> index 000000000000..45c1ef17bc57
> --- /dev/null
> +++ b/crypto/hash.h
> @@ -0,0 +1,10 @@
> +#ifndef CRYPTO_HASH_H
> +#define CRYPTO_HASH_H
> +
> +#include "../kerncompat.h"
> +
> +#define CRYPTO_HASH_SIZE_MAX 32
> +
> +int hash_xxhash(const u8 *buf, size_t length, u8 *out);
> +
> +#endif
> diff --git a/ctree.c b/ctree.c
> index a52ccfe19f94..139ffd613da5 100644
> --- a/ctree.c
> +++ b/ctree.c
> @@ -43,6 +43,7 @@ static struct btrfs_csum {
> const char *name;
> } btrfs_csums[] = {
> [BTRFS_CSUM_TYPE_CRC32] = { 4, "crc32c" },
> + [BTRFS_CSUM_TYPE_XXHASH] = { 8, "xxhash64" },
> };
>
> u16 btrfs_super_csum_size(const struct btrfs_super_block *sb)
> diff --git a/ctree.h b/ctree.h
> index f70271dc658e..144c89eb4a36 100644
> --- a/ctree.h
> +++ b/ctree.h
> @@ -166,7 +166,8 @@ struct btrfs_free_space_ctl;
>
> /* csum types */
> enum btrfs_csum_type {
> - BTRFS_CSUM_TYPE_CRC32 = 0,
> + BTRFS_CSUM_TYPE_CRC32 = 0,
> + BTRFS_CSUM_TYPE_XXHASH = 1,
> };
>
> #define BTRFS_EMPTY_DIR_SIZE 0
> diff --git a/disk-io.c b/disk-io.c
> index 72c672919cf9..59e297e2039c 100644
> --- a/disk-io.c
> +++ b/disk-io.c
> @@ -34,6 +34,7 @@
> #include "print-tree.h"
> #include "common/rbtree-utils.h"
> #include "common/device-scan.h"
> +#include "crypto/hash.h"
>
> /* specified errno for check_tree_block */
> #define BTRFS_BAD_BYTENR (-1)
> @@ -149,6 +150,8 @@ int btrfs_csum_data(u16 csum_type, const u8 *data, u8 *out, size_t len)
> crc = crc32c(crc, data, len);
> put_unaligned_le32(~crc, out);
> return 0;
> + case BTRFS_CSUM_TYPE_XXHASH:
> + return hash_xxhash(data, len, out);
> default:
> fprintf(stderr, "ERROR: unknown csum type: %d\n", csum_type);
> ASSERT(0);
> diff --git a/mkfs/main.c b/mkfs/main.c
> index f52e8b61a460..a6deddc47c69 100644
> --- a/mkfs/main.c
> +++ b/mkfs/main.c
> @@ -392,6 +392,9 @@ static enum btrfs_csum_type parse_csum_type(const char *s)
> {
> if (strcasecmp(s, "crc32c") == 0) {
> return BTRFS_CSUM_TYPE_CRC32;
> + } else if (strcasecmp(s, "xxhash64") == 0 ||
> + strcasecmp(s, "xxhash") == 0) {
> + return BTRFS_CSUM_TYPE_XXHASH;
> } else {
> error("unknown csum type %s", s);
> exit(1);
>
