| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Hsiang Kao | 1145 | 87.34% | 42 | 77.78% |
| Yue Hu | 90 | 6.86% | 3 | 5.56% |
| Jeffle Xu | 62 | 4.73% | 5 | 9.26% |
| David Anderson | 6 | 0.46% | 1 | 1.85% |
| Huang Jianan | 4 | 0.31% | 2 | 3.70% |
| Pratik Shinde | 4 | 0.31% | 1 | 1.85% |
| Total | 1311 | 54 |
/* SPDX-License-Identifier: GPL-2.0-only OR Apache-2.0 */ /* * EROFS (Enhanced ROM File System) on-disk format definition * * Copyright (C) 2017-2018 HUAWEI, Inc. * https://www.huawei.com/ * Copyright (C) 2021, Alibaba Cloud */ #ifndef __EROFS_FS_H #define __EROFS_FS_H /* to allow for x86 boot sectors and other oddities. */ #define EROFS_SUPER_OFFSET 1024 #define EROFS_FEATURE_COMPAT_SB_CHKSUM 0x00000001 #define EROFS_FEATURE_COMPAT_MTIME 0x00000002 #define EROFS_FEATURE_COMPAT_XATTR_FILTER 0x00000004 /* * Any bits that aren't in EROFS_ALL_FEATURE_INCOMPAT should * be incompatible with this kernel version. */ #define EROFS_FEATURE_INCOMPAT_ZERO_PADDING 0x00000001 #define EROFS_FEATURE_INCOMPAT_COMPR_CFGS 0x00000002 #define EROFS_FEATURE_INCOMPAT_BIG_PCLUSTER 0x00000002 #define EROFS_FEATURE_INCOMPAT_CHUNKED_FILE 0x00000004 #define EROFS_FEATURE_INCOMPAT_DEVICE_TABLE 0x00000008 #define EROFS_FEATURE_INCOMPAT_COMPR_HEAD2 0x00000008 #define EROFS_FEATURE_INCOMPAT_ZTAILPACKING 0x00000010 #define EROFS_FEATURE_INCOMPAT_FRAGMENTS 0x00000020 #define EROFS_FEATURE_INCOMPAT_DEDUPE 0x00000020 #define EROFS_FEATURE_INCOMPAT_XATTR_PREFIXES 0x00000040 #define EROFS_FEATURE_INCOMPAT_48BIT 0x00000080 #define EROFS_ALL_FEATURE_INCOMPAT \ ((EROFS_FEATURE_INCOMPAT_48BIT << 1) - 1) #define EROFS_SB_EXTSLOT_SIZE 16 struct erofs_deviceslot { u8 tag[64]; /* digest(sha256), etc. */ __le32 blocks_lo; /* total blocks count of this device */ __le32 uniaddr_lo; /* unified starting block of this device */ __le32 blocks_hi; /* total blocks count MSB */ __le16 uniaddr_hi; /* unified starting block MSB */ u8 reserved[50]; }; #define EROFS_DEVT_SLOT_SIZE sizeof(struct erofs_deviceslot) /* erofs on-disk super block (currently 128 bytes) */ struct erofs_super_block { __le32 magic; /* file system magic number */ __le32 checksum; /* crc32c to avoid unexpected on-disk overlap */ __le32 feature_compat; __u8 blkszbits; /* filesystem block size in bit shift */ __u8 sb_extslots; /* superblock size = 128 + sb_extslots * 16 */ union { __le16 rootnid_2b; /* nid of root directory */ __le16 blocks_hi; /* (48BIT on) blocks count MSB */ } __packed rb; __le64 inos; /* total valid ino # (== f_files - f_favail) */ __le64 epoch; /* base seconds used for compact inodes */ __le32 fixed_nsec; /* fixed nanoseconds for compact inodes */ __le32 blocks_lo; /* blocks count LSB */ __le32 meta_blkaddr; /* start block address of metadata area */ __le32 xattr_blkaddr; /* start block address of shared xattr area */ __u8 uuid[16]; /* 128-bit uuid for volume */ __u8 volume_name[16]; /* volume name */ __le32 feature_incompat; union { /* bitmap for available compression algorithms */ __le16 available_compr_algs; /* customized sliding window size instead of 64k by default */ __le16 lz4_max_distance; } __packed u1; __le16 extra_devices; /* # of devices besides the primary device */ __le16 devt_slotoff; /* startoff = devt_slotoff * devt_slotsize */ __u8 dirblkbits; /* directory block size in bit shift */ __u8 xattr_prefix_count; /* # of long xattr name prefixes */ __le32 xattr_prefix_start; /* start of long xattr prefixes */ __le64 packed_nid; /* nid of the special packed inode */ __u8 xattr_filter_reserved; /* reserved for xattr name filter */ __u8 reserved[3]; __le32 build_time; /* seconds added to epoch for mkfs time */ __le64 rootnid_8b; /* (48BIT on) nid of root directory */ __u8 reserved2[8]; }; /* * EROFS inode datalayout (i_format in on-disk inode): * 0 - uncompressed flat inode without tail-packing inline data: * 1 - compressed inode with non-compact indexes: * 2 - uncompressed flat inode with tail-packing inline data: * 3 - compressed inode with compact indexes: * 4 - chunk-based inode with (optional) multi-device support: * 5~7 - reserved */ enum { EROFS_INODE_FLAT_PLAIN = 0, EROFS_INODE_COMPRESSED_FULL = 1, EROFS_INODE_FLAT_INLINE = 2, EROFS_INODE_COMPRESSED_COMPACT = 3, EROFS_INODE_CHUNK_BASED = 4, EROFS_INODE_DATALAYOUT_MAX }; static inline bool erofs_inode_is_data_compressed(unsigned int datamode) { return datamode == EROFS_INODE_COMPRESSED_COMPACT || datamode == EROFS_INODE_COMPRESSED_FULL; } /* bit definitions of inode i_format */ #define EROFS_I_VERSION_MASK 0x01 #define EROFS_I_DATALAYOUT_MASK 0x07 #define EROFS_I_VERSION_BIT 0 #define EROFS_I_DATALAYOUT_BIT 1 #define EROFS_I_NLINK_1_BIT 4 /* non-directory compact inodes only */ #define EROFS_I_DOT_OMITTED_BIT 4 /* (directories) omit the `.` dirent */ #define EROFS_I_ALL ((1 << (EROFS_I_NLINK_1_BIT + 1)) - 1) /* indicate chunk blkbits, thus 'chunksize = blocksize << chunk blkbits' */ #define EROFS_CHUNK_FORMAT_BLKBITS_MASK 0x001F /* with chunk indexes or just a 4-byte block array */ #define EROFS_CHUNK_FORMAT_INDEXES 0x0020 #define EROFS_CHUNK_FORMAT_48BIT 0x0040 #define EROFS_CHUNK_FORMAT_ALL ((EROFS_CHUNK_FORMAT_48BIT << 1) - 1) /* 32-byte on-disk inode */ #define EROFS_INODE_LAYOUT_COMPACT 0 /* 64-byte on-disk inode */ #define EROFS_INODE_LAYOUT_EXTENDED 1 struct erofs_inode_chunk_info { __le16 format; /* chunk blkbits, etc. */ __le16 reserved; }; union erofs_inode_i_u { __le32 blocks_lo; /* total blocks count (if compressed inodes) */ __le32 startblk_lo; /* starting block number (if flat inodes) */ __le32 rdev; /* device ID (if special inodes) */ struct erofs_inode_chunk_info c; }; union erofs_inode_i_nb { __le16 nlink; /* if EROFS_I_NLINK_1_BIT is unset */ __le16 blocks_hi; /* total blocks count MSB */ __le16 startblk_hi; /* starting block number MSB */ } __packed; /* 32-byte reduced form of an ondisk inode */ struct erofs_inode_compact { __le16 i_format; /* inode format hints */ __le16 i_xattr_icount; __le16 i_mode; union erofs_inode_i_nb i_nb; __le32 i_size; __le32 i_mtime; union erofs_inode_i_u i_u; __le32 i_ino; /* only used for 32-bit stat compatibility */ __le16 i_uid; __le16 i_gid; __le32 i_reserved; }; /* 64-byte complete form of an ondisk inode */ struct erofs_inode_extended { __le16 i_format; /* inode format hints */ __le16 i_xattr_icount; __le16 i_mode; union erofs_inode_i_nb i_nb; __le64 i_size; union erofs_inode_i_u i_u; __le32 i_ino; /* only used for 32-bit stat compatibility */ __le32 i_uid; __le32 i_gid; __le64 i_mtime; __le32 i_mtime_nsec; __le32 i_nlink; __u8 i_reserved2[16]; }; /* * inline xattrs (n == i_xattr_icount): * erofs_xattr_ibody_header(1) + (n - 1) * 4 bytes * 12 bytes / \ * / \ * /-----------------------\ * | erofs_xattr_entries+ | * +-----------------------+ * inline xattrs must starts in erofs_xattr_ibody_header, * for read-only fs, no need to introduce h_refcount */ struct erofs_xattr_ibody_header { __le32 h_name_filter; /* bit value 1 indicates not-present */ __u8 h_shared_count; __u8 h_reserved2[7]; __le32 h_shared_xattrs[]; /* shared xattr id array */ }; /* Name indexes */ #define EROFS_XATTR_INDEX_USER 1 #define EROFS_XATTR_INDEX_POSIX_ACL_ACCESS 2 #define EROFS_XATTR_INDEX_POSIX_ACL_DEFAULT 3 #define EROFS_XATTR_INDEX_TRUSTED 4 #define EROFS_XATTR_INDEX_LUSTRE 5 #define EROFS_XATTR_INDEX_SECURITY 6 /* * bit 7 of e_name_index is set when it refers to a long xattr name prefix, * while the remained lower bits represent the index of the prefix. */ #define EROFS_XATTR_LONG_PREFIX 0x80 #define EROFS_XATTR_LONG_PREFIX_MASK 0x7f #define EROFS_XATTR_FILTER_BITS 32 #define EROFS_XATTR_FILTER_DEFAULT UINT32_MAX #define EROFS_XATTR_FILTER_SEED 0x25BBE08F /* xattr entry (for both inline & shared xattrs) */ struct erofs_xattr_entry { __u8 e_name_len; /* length of name */ __u8 e_name_index; /* attribute name index */ __le16 e_value_size; /* size of attribute value */ /* followed by e_name and e_value */ char e_name[]; /* attribute name */ }; /* long xattr name prefix */ struct erofs_xattr_long_prefix { __u8 base_index; /* short xattr name prefix index */ char infix[]; /* infix apart from short prefix */ }; static inline unsigned int erofs_xattr_ibody_size(__le16 i_xattr_icount) { if (!i_xattr_icount) return 0; /* 1 header + n-1 * 4 bytes inline xattr to keep continuity */ return sizeof(struct erofs_xattr_ibody_header) + sizeof(__u32) * (le16_to_cpu(i_xattr_icount) - 1); } #define EROFS_XATTR_ALIGN(size) round_up(size, sizeof(struct erofs_xattr_entry)) static inline unsigned int erofs_xattr_entry_size(struct erofs_xattr_entry *e) { return EROFS_XATTR_ALIGN(sizeof(struct erofs_xattr_entry) + e->e_name_len + le16_to_cpu(e->e_value_size)); } /* represent a zeroed chunk (hole) */ #define EROFS_NULL_ADDR -1 /* 4-byte block address array */ #define EROFS_BLOCK_MAP_ENTRY_SIZE sizeof(__le32) /* 8-byte inode chunk index */ struct erofs_inode_chunk_index { __le16 startblk_hi; /* starting block number MSB */ __le16 device_id; /* back-end storage id (with bits masked) */ __le32 startblk_lo; /* starting block number of this chunk */ }; /* dirent sorts in alphabet order, thus we can do binary search */ struct erofs_dirent { __le64 nid; /* node number */ __le16 nameoff; /* start offset of file name */ __u8 file_type; /* file type */ __u8 reserved; /* reserved */ } __packed; /* * EROFS file types should match generic FT_* types and * it seems no need to add BUILD_BUG_ONs since potential * unmatchness will break other fses as well... */ #define EROFS_NAME_LEN 255 /* maximum supported encoded size of a physical compressed cluster */ #define Z_EROFS_PCLUSTER_MAX_SIZE (1024 * 1024) /* maximum supported decoded size of a physical compressed cluster */ #define Z_EROFS_PCLUSTER_MAX_DSIZE (12 * 1024 * 1024) /* available compression algorithm types (for h_algorithmtype) */ enum { Z_EROFS_COMPRESSION_LZ4 = 0, Z_EROFS_COMPRESSION_LZMA = 1, Z_EROFS_COMPRESSION_DEFLATE = 2, Z_EROFS_COMPRESSION_ZSTD = 3, Z_EROFS_COMPRESSION_MAX }; #define Z_EROFS_ALL_COMPR_ALGS ((1 << Z_EROFS_COMPRESSION_MAX) - 1) /* 14 bytes (+ length field = 16 bytes) */ struct z_erofs_lz4_cfgs { __le16 max_distance; __le16 max_pclusterblks; u8 reserved[10]; } __packed; /* 14 bytes (+ length field = 16 bytes) */ struct z_erofs_lzma_cfgs { __le32 dict_size; __le16 format; u8 reserved[8]; } __packed; #define Z_EROFS_LZMA_MAX_DICT_SIZE (8 * Z_EROFS_PCLUSTER_MAX_SIZE) /* 6 bytes (+ length field = 8 bytes) */ struct z_erofs_deflate_cfgs { u8 windowbits; /* 8..15 for DEFLATE */ u8 reserved[5]; } __packed; /* 6 bytes (+ length field = 8 bytes) */ struct z_erofs_zstd_cfgs { u8 format; u8 windowlog; /* windowLog - ZSTD_WINDOWLOG_ABSOLUTEMIN(10) */ u8 reserved[4]; } __packed; #define Z_EROFS_ZSTD_MAX_DICT_SIZE Z_EROFS_PCLUSTER_MAX_SIZE /* * Enable COMPACTED_2B for EROFS_INODE_COMPRESSED_COMPACT inodes: * 4B (disabled) vs 4B+2B+4B (enabled) */ #define Z_EROFS_ADVISE_COMPACTED_2B 0x0001 /* Enable extent metadata for EROFS_INODE_COMPRESSED_FULL inodes */ #define Z_EROFS_ADVISE_EXTENTS 0x0001 #define Z_EROFS_ADVISE_BIG_PCLUSTER_1 0x0002 #define Z_EROFS_ADVISE_BIG_PCLUSTER_2 0x0004 #define Z_EROFS_ADVISE_INLINE_PCLUSTER 0x0008 #define Z_EROFS_ADVISE_INTERLACED_PCLUSTER 0x0010 #define Z_EROFS_ADVISE_FRAGMENT_PCLUSTER 0x0020 /* Indicate the record size for each extent if extent metadata is used */ #define Z_EROFS_ADVISE_EXTRECSZ_BIT 1 #define Z_EROFS_ADVISE_EXTRECSZ_MASK 0x3 #define Z_EROFS_FRAGMENT_INODE_BIT 7 struct z_erofs_map_header { union { /* fragment data offset in the packed inode */ __le32 h_fragmentoff; struct { __le16 h_reserved1; /* indicates the encoded size of tailpacking data */ __le16 h_idata_size; }; __le32 h_extents_lo; /* extent count LSB */ }; __le16 h_advise; union { struct { /* algorithm type (bit 0-3: HEAD1; bit 4-7: HEAD2) */ __u8 h_algorithmtype; /* * bit 0-3 : logical cluster bits - blkszbits * bit 4-6 : reserved * bit 7 : pack the whole file into packed inode */ __u8 h_clusterbits; } __packed; __le16 h_extents_hi; /* extent count MSB */ } __packed; }; enum { Z_EROFS_LCLUSTER_TYPE_PLAIN = 0, Z_EROFS_LCLUSTER_TYPE_HEAD1 = 1, Z_EROFS_LCLUSTER_TYPE_NONHEAD = 2, Z_EROFS_LCLUSTER_TYPE_HEAD2 = 3, Z_EROFS_LCLUSTER_TYPE_MAX }; #define Z_EROFS_LI_LCLUSTER_TYPE_MASK (Z_EROFS_LCLUSTER_TYPE_MAX - 1) /* (noncompact only, HEAD) This pcluster refers to partial decompressed data */ #define Z_EROFS_LI_PARTIAL_REF (1 << 15) /* Set on 1st non-head lcluster to store compressed block counti (in blocks) */ #define Z_EROFS_LI_D0_CBLKCNT (1 << 11) struct z_erofs_lcluster_index { __le16 di_advise; /* where to decompress in the head lcluster */ __le16 di_clusterofs; union { __le32 blkaddr; /* for the HEAD lclusters */ /* * [0] - distance to its HEAD lcluster * [1] - distance to the next HEAD lcluster */ __le16 delta[2]; /* for the NONHEAD lclusters */ } di_u; }; #define Z_EROFS_MAP_HEADER_END(end) \ (ALIGN(end, 8) + sizeof(struct z_erofs_map_header)) #define Z_EROFS_FULL_INDEX_START(end) (Z_EROFS_MAP_HEADER_END(end) + 8) #define Z_EROFS_EXTENT_PLEN_PARTIAL BIT(27) #define Z_EROFS_EXTENT_PLEN_FMT_BIT 28 #define Z_EROFS_EXTENT_PLEN_MASK ((Z_EROFS_PCLUSTER_MAX_SIZE << 1) - 1) struct z_erofs_extent { __le32 plen; /* encoded length */ __le32 pstart_lo; /* physical offset */ __le32 pstart_hi; /* physical offset MSB */ __le32 lstart_lo; /* logical offset */ __le32 lstart_hi; /* logical offset MSB (>= 4GiB inodes) */ __u8 reserved[12]; /* for future use */ }; static inline int z_erofs_extent_recsize(unsigned int advise) { return 4 << ((advise >> Z_EROFS_ADVISE_EXTRECSZ_BIT) & Z_EROFS_ADVISE_EXTRECSZ_MASK); } /* check the EROFS on-disk layout strictly at compile time */ static inline void erofs_check_ondisk_layout_definitions(void) { const __le64 fmh = *(__le64 *)&(struct z_erofs_map_header) { .h_clusterbits = 1 << Z_EROFS_FRAGMENT_INODE_BIT }; BUILD_BUG_ON(sizeof(struct erofs_super_block) != 128); BUILD_BUG_ON(sizeof(struct erofs_inode_compact) != 32); BUILD_BUG_ON(sizeof(struct erofs_inode_extended) != 64); BUILD_BUG_ON(sizeof(struct erofs_xattr_ibody_header) != 12); BUILD_BUG_ON(sizeof(struct erofs_xattr_entry) != 4); BUILD_BUG_ON(sizeof(struct erofs_inode_chunk_info) != 4); BUILD_BUG_ON(sizeof(struct erofs_inode_chunk_index) != 8); BUILD_BUG_ON(sizeof(struct z_erofs_map_header) != 8); BUILD_BUG_ON(sizeof(struct z_erofs_lcluster_index) != 8); BUILD_BUG_ON(sizeof(struct erofs_dirent) != 12); /* keep in sync between 2 index structures for better extendibility */ BUILD_BUG_ON(sizeof(struct erofs_inode_chunk_index) != sizeof(struct z_erofs_lcluster_index)); BUILD_BUG_ON(sizeof(struct erofs_deviceslot) != 128); /* exclude old compiler versions like gcc 7.5.0 */ BUILD_BUG_ON(__builtin_constant_p(fmh) ? fmh != cpu_to_le64(1ULL << 63) : 0); } #endif
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