Initial support for stratis, ref. https://github.com/stratis-storage Signed-off-by: Tony Asleson <tasleson@xxxxxxxxxx> --- libblkid/src/Makemodule.am | 1 + libblkid/src/superblocks/stratis.c | 104 +++++++++++++++++++++++++++++++++ libblkid/src/superblocks/superblocks.c | 1 + libblkid/src/superblocks/superblocks.h | 1 + 4 files changed, 107 insertions(+) create mode 100644 libblkid/src/superblocks/stratis.c diff --git a/libblkid/src/Makemodule.am b/libblkid/src/Makemodule.am index 415c9f408..65d2e66ed 100644 --- a/libblkid/src/Makemodule.am +++ b/libblkid/src/Makemodule.am @@ -82,6 +82,7 @@ libblkid_la_SOURCES = \ libblkid/src/superblocks/romfs.c \ libblkid/src/superblocks/silicon_raid.c \ libblkid/src/superblocks/squashfs.c \ + libblkid/src/superblocks/stratis.c \ libblkid/src/superblocks/superblocks.c \ libblkid/src/superblocks/superblocks.h \ libblkid/src/superblocks/swap.c \ diff --git a/libblkid/src/superblocks/stratis.c b/libblkid/src/superblocks/stratis.c new file mode 100644 index 000000000..ae23b0fa1 --- /dev/null +++ b/libblkid/src/superblocks/stratis.c @@ -0,0 +1,104 @@ +/* + * Copyright (C) 2018 Tony Asleson <tasleson@xxxxxxxxxx> + * + * This file may be redistributed under the terms of the + * GNU Lesser General Public License. + */ + +/* + * Specification for on disk format + * https://stratis-storage.github.io/StratisSoftwareDesign.pdf + */ +#include <stdio.h> +#include <stdlib.h> +#include <unistd.h> +#include <string.h> +#include <stdint.h> +#include <inttypes.h> + +#include "superblocks.h" +#include "crc32c.h" + +struct stratis_sb { + uint32_t crc32; + uint8_t magic[16]; + uint64_t sectors; + uint8_t reserved[4]; + uint8_t pool_uuid[32]; + uint8_t dev_uuid[32]; + uint64_t mda_size; + uint64_t reserved_size; + uint64_t flags; + uint64_t initialization_time; +} __attribute__ ((__packed__)); + +#define BS 512 +#define FIRST_COPY_OFFSET BS +#define SECOND_COPY_OFFSET (BS * 9) +#define SB_AREA_SIZE (BS * 16) + +const char STRATIS_MAGIC[] = "!Stra0tis\x86\xff\x02^\x41rh"; +#define MAGIC_LEN (sizeof(STRATIS_MAGIC) - 1) + +#define _MAGIC_OFFSET (offsetof(const struct stratis_sb, magic)) +#define MAGIC_OFFSET_COPY_1 (FIRST_COPY_OFFSET + _MAGIC_OFFSET) +#define MAGIC_OFFSET_COPY_2 (SECOND_COPY_OFFSET + _MAGIC_OFFSET) + +static int stratis_valid_sb(blkid_probe pr, uint8_t *p) +{ + const struct stratis_sb *stratis = (const struct stratis_sb *)p; + uint32_t crc = 0; + + // generate CRC from byte position 4 for length 508 == 512 byte sector + crc = crc32c(~0L, p + sizeof(stratis->crc32), + BS - sizeof(stratis->crc32)); + crc ^= ~0L; + + return blkid_probe_verify_csum(pr, crc, le32_to_cpu(stratis->crc32)); +} + +static int probe_stratis(blkid_probe pr, + const struct blkid_idmag *mag __attribute__((__unused__))) +{ + const struct stratis_sb *stratis = NULL; + uint8_t *buf = blkid_probe_get_buffer(pr, 0, SB_AREA_SIZE); + + if (!buf) + return errno ? -errno : 1; + + if (stratis_valid_sb(pr, buf + FIRST_COPY_OFFSET)) { + stratis = (const struct stratis_sb *)(buf + FIRST_COPY_OFFSET); + } else { + if (!stratis_valid_sb(pr, buf + SECOND_COPY_OFFSET)) + return 1; + + stratis = (const struct stratis_sb *) + (buf + SECOND_COPY_OFFSET); + } + + blkid_probe_strncpy_uuid(pr, (unsigned char *)stratis->dev_uuid, + sizeof(stratis->dev_uuid)); + blkid_probe_set_value(pr, "POOL_UUID", + (unsigned char *)stratis->pool_uuid, + sizeof(stratis->pool_uuid)); + + blkid_probe_sprintf_value(pr, "SECTORS", "%" PRIu64, stratis->sectors); + blkid_probe_sprintf_value(pr, "INITIALIZATION_TIME", "%" PRIu64, + stratis->initialization_time); + + return 0; +} + +const struct blkid_idinfo stratis_idinfo = { + .name = "stratis", + .usage = BLKID_USAGE_RAID, + .probefunc = probe_stratis, + .minsz = SB_AREA_SIZE, + .magics = { + { .magic = STRATIS_MAGIC, .len = MAGIC_LEN, + .sboff = MAGIC_OFFSET_COPY_1}, + { .magic = STRATIS_MAGIC, .len = MAGIC_LEN, + .sboff = MAGIC_OFFSET_COPY_2}, + { NULL } + } +}; diff --git a/libblkid/src/superblocks/superblocks.c b/libblkid/src/superblocks/superblocks.c index 4387ab9e5..076541d1a 100644 --- a/libblkid/src/superblocks/superblocks.c +++ b/libblkid/src/superblocks/superblocks.c @@ -114,6 +114,7 @@ static const struct blkid_idinfo *idinfos[] = &vmfs_volume_idinfo, &ubi_idinfo, &vdo_idinfo, + &stratis_idinfo, /* Filesystems */ &vfat_idinfo, diff --git a/libblkid/src/superblocks/superblocks.h b/libblkid/src/superblocks/superblocks.h index 38f6a8a65..2723fb1d5 100644 --- a/libblkid/src/superblocks/superblocks.h +++ b/libblkid/src/superblocks/superblocks.h @@ -80,6 +80,7 @@ extern const struct blkid_idinfo f2fs_idinfo; extern const struct blkid_idinfo bcache_idinfo; extern const struct blkid_idinfo mpool_idinfo; extern const struct blkid_idinfo vdo_idinfo; +extern const struct blkid_idinfo stratis_idinfo; /* * superblock functions -- 2.13.6 -- To unsubscribe from this list: send the line "unsubscribe util-linux" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
