c20e42e32
Norbert Lange
2020-11-18
Subject
util-linux: support erofs filesystem
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util-linux/volume_id/erofs.c +67 -0util-linux/volume_id/volume_id.c +3 -0util-linux/volume_id/volume_id_internal.h +2 -0
util-linux/volume_id/erofs.c+67 -0
| @@ -0,0 +1,67 @@ | |
| + | /* |
| + | * volume_id - reads filesystem label and uuid |
| + | * |
| + | * Copyright (C) 2020 Norbert Lange <[email protected]> |
| + | * |
| + | * 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; |
| + | } |
util-linux/volume_id/volume_id.c+3 -0
| @@ -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 | |
util-linux/volume_id/volume_id_internal.h+2 -0
| @@ -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*/); | |