diff options
| -rw-r--r-- | util-linux/volume_id/erofs.c | 67 | ||||
| -rw-r--r-- | util-linux/volume_id/volume_id.c | 3 | ||||
| -rw-r--r-- | util-linux/volume_id/volume_id_internal.h | 2 |
3 files changed, 72 insertions, 0 deletions
diff --git a/util-linux/volume_id/erofs.c b/util-linux/volume_id/erofs.c new file mode 100644 index 000000000..a163a353d --- /dev/null +++ b/util-linux/volume_id/erofs.c @@ -0,0 +1,67 @@ +/* + * volume_id - reads filesystem label and uuid + * + * Copyright (C) 2020 Norbert Lange <nolange79@gmail.com> + * + * Licensed under GPLv2, see file LICENSE in this source tree. + */ +//config:config FEATURE_VOLUMEID_EROFS +//config: bool "erofs filesystem" +//config: default y +//config: depends on VOLUMEID +//config: help +//config: Erofs is a compressed readonly filesystem for Linux. + +//kbuild:lib-$(CONFIG_FEATURE_VOLUMEID_EROFS) += erofs.o + +#include "volume_id_internal.h" + +#define EROFS_SUPER_MAGIC_V1 0xE0F5E1E2 +#define EROFS_SUPER_OFFSET 1024 +#define EROFS_FEATURE_COMPAT_SB_CHKSUM 0x00000001 + +/* 128-byte erofs on-disk super block */ +struct erofs_super_block { + uint32_t magic; /* file system magic number */ + uint32_t checksum; /* crc32c(super_block) */ + uint32_t feature_compat; + uint8_t blkszbits; /* support block_size == PAGE_SIZE only */ + uint8_t reserved; + + uint16_t root_nid; /* nid of root directory */ + uint64_t inos; /* total valid ino # (== f_files - f_favail) */ + + uint64_t build_time; /* inode v1 time derivation */ + uint32_t build_time_nsec; /* inode v1 time derivation in nano scale */ + uint32_t blocks; /* used for statfs */ + uint32_t meta_blkaddr; /* start block address of metadata area */ + uint32_t xattr_blkaddr; /* start block address of shared xattr area */ + uint8_t uuid[16]; /* 128-bit uuid for volume */ + uint8_t volume_name[16]; /* volume name */ + uint32_t feature_incompat; + uint8_t reserved2[44]; +} PACKED; + +int FAST_FUNC volume_id_probe_erofs(struct volume_id *id /*,uint64_t off*/) +{ + struct erofs_super_block *sb; + + BUILD_BUG_ON(sizeof(struct erofs_super_block) != 128); + + dbg("erofs: probing at offset 0x%llx", EROFS_SUPER_OFFSET); + sb = volume_id_get_buffer(id, EROFS_SUPER_OFFSET, sizeof(*sb)); + if (!sb) + return -1; + + if (sb->magic != cpu_to_le32(EROFS_SUPER_MAGIC_V1)) + return -1; + + IF_FEATURE_BLKID_TYPE(id->type = "erofs"); + + volume_id_set_label_string(id, sb->volume_name, + MIN(sizeof(sb->volume_name), VOLUME_ID_LABEL_SIZE)); + + volume_id_set_uuid(id, sb->uuid, UUID_DCE); + + return 0; +} diff --git a/util-linux/volume_id/volume_id.c b/util-linux/volume_id/volume_id.c index c3f07a741..99150a5b7 100644 --- a/util-linux/volume_id/volume_id.c +++ b/util-linux/volume_id/volume_id.c @@ -106,6 +106,9 @@ static const probe_fptr fs1[] = { #if ENABLE_FEATURE_VOLUMEID_SQUASHFS volume_id_probe_squashfs, #endif +#if ENABLE_FEATURE_VOLUMEID_EROFS + volume_id_probe_erofs, +#endif #if ENABLE_FEATURE_VOLUMEID_XFS volume_id_probe_xfs, #endif diff --git a/util-linux/volume_id/volume_id_internal.h b/util-linux/volume_id/volume_id_internal.h index ada18339d..609beb84e 100644 --- a/util-linux/volume_id/volume_id_internal.h +++ b/util-linux/volume_id/volume_id_internal.h @@ -215,6 +215,8 @@ int FAST_FUNC volume_id_probe_romfs(struct volume_id *id /*,uint64_t off*/); int FAST_FUNC volume_id_probe_squashfs(struct volume_id *id /*,uint64_t off*/); +int FAST_FUNC volume_id_probe_erofs(struct volume_id *id /*,uint64_t off*/); + int FAST_FUNC volume_id_probe_sysv(struct volume_id *id /*,uint64_t off*/); int FAST_FUNC volume_id_probe_udf(struct volume_id *id /*,uint64_t off*/); |