e411cd071
Sven-Göran Bergh
2018-01-19
Subject
volume_id: add LittleFS detection
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util-linux/volume_id/lfs.c +62 -0util-linux/volume_id/volume_id.c +3 -0util-linux/volume_id/volume_id_internal.h +2 -0
util-linux/volume_id/lfs.c+62 -0
| @@ -0,0 +1,62 @@ | |
| + | /* |
| + | * volume_id - reads filesystem label and uuid |
| + | * |
| + | * Copyright (C) 2018 Sven-Göran Bergh <[email protected]> |
| + | * |
| + | * Licensed under GPLv2, see file LICENSE in this source tree. |
| + | */ |
| + | //config:config FEATURE_VOLUMEID_LFS |
| + | //config: bool "LittleFS filesystem" |
| + | //config: default y |
| + | //config: depends on VOLUMEID && FEATURE_BLKID_TYPE |
| + | //config: help |
| + | //config: LittleFS is a small fail-safe filesystem designed for embedded |
| + | //config: systems. It has strong copy-on-write guarantees and storage on disk |
| + | //config: is always kept in a valid state. It also provides a form of dynamic |
| + | //config: wear levelling for systems that can not fit a full flash translation |
| + | //config: layer. |
| + | |
| + | //kbuild:lib-$(CONFIG_FEATURE_VOLUMEID_LFS) += lfs.o |
| + | |
| + | #include "volume_id_internal.h" |
| + | |
| + | #define LFS_SB1_OFFSET 0x10 |
| + | #define LFS_MAGIC_NAME "littlefs" |
| + | #define LFS_MAGIC_LEN 8 |
| + | |
| + | // The superblock is stored in the first metadata pair, i.e the first two blocks. |
| + | struct lfs_super_block { // A block in a metadata pair |
| + | // /* 0x00 */ uint32_t rev_count; // Revision count |
| + | // /* 0x04 */ uint32_t dir_size; // Directory size |
| + | // /* 0x08 */ uint64_t tail_ptr; // Tail pointer |
| + | /* 0x10 */ uint8_t entry_type; // Entry type |
| + | /* 0x11 */ uint8_t entry_len; // Entry length |
| + | /* 0x12 */ uint8_t att_len; // Attribute length |
| + | /* 0x13 */ uint8_t name_len; // Name length |
| + | /* 0x14 */ uint64_t root_dir; // Root directory |
| + | /* 0x1C */ uint32_t block_size; // Block size |
| + | /* 0x20 */ uint32_t block_count; // Block count |
| + | /* 0x24 */ uint16_t ver_major; // Version major |
| + | /* 0x26 */ uint16_t ver_minor; // Version minor |
| + | /* 0x28 */ uint8_t magic[LFS_MAGIC_LEN]; // Magic string "littlefs" |
| + | // /* 0x30 */ uint32_t crc; // CRC-32 checksum |
| + | } PACKED; |
| + | |
| + | int FAST_FUNC volume_id_probe_lfs(struct volume_id *id /*,uint64_t off*/) |
| + | { |
| + | struct lfs_super_block *sb; |
| + | |
| + | // Go for primary super block (ignore second sb) |
| + | dbg("lfs: probing at offset 0x%x", LFS_SB1_OFFSET); |
| + | sb = volume_id_get_buffer(id, LFS_SB1_OFFSET, sizeof(*sb)); |
| + | |
| + | if (!sb) |
| + | return -1; |
| + | |
| + | if (memcmp(sb->magic, LFS_MAGIC_NAME, LFS_MAGIC_LEN) != 0) |
| + | return -1; |
| + | |
| + | IF_FEATURE_BLKID_TYPE(id->type = LFS_MAGIC_NAME); |
| + | |
| + | return 0; |
| + | } |
util-linux/volume_id/volume_id.c+3 -0
| @@ -97,6 +97,9 @@ static const probe_fptr fs1[] = { | |
| #if ENABLE_FEATURE_VOLUMEID_EXFAT | |
| volume_id_probe_exfat, | |
| #endif | |
| + | #if ENABLE_FEATURE_VOLUMEID_LFS |
| + | volume_id_probe_lfs, |
| + | #endif |
| #if ENABLE_FEATURE_VOLUMEID_MAC | |
| volume_id_probe_mac_partition_map, | |
| #endif | |
util-linux/volume_id/volume_id_internal.h+2 -0
| @@ -187,6 +187,8 @@ int FAST_FUNC volume_id_probe_iso9660(struct volume_id *id /*,uint64_t off*/); | |
| int FAST_FUNC volume_id_probe_jfs(struct volume_id *id /*,uint64_t off*/); | |
| + | int FAST_FUNC volume_id_probe_lfs(struct volume_id *id /*,uint64_t off*/); |
| + | |
| int FAST_FUNC volume_id_probe_linux_swap(struct volume_id *id /*,uint64_t off*/); | |
| int FAST_FUNC volume_id_probe_luks(struct volume_id *id /*,uint64_t off*/); | |