| 1 | /*
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| 2 | * Copyright (c) 2011 Frantisek Princ
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| 3 | * All rights reserved.
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| 4 | *
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| 5 | * Redistribution and use in source and binary forms, with or without
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| 6 | * modification, are permitted provided that the following conditions
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| 7 | * are met:
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| 8 | *
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| 9 | * - Redistributions of source code must retain the above copyright
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| 10 | * notice, this list of conditions and the following disclaimer.
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| 11 | * - Redistributions in binary form must reproduce the above copyright
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| 12 | * notice, this list of conditions and the following disclaimer in the
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| 13 | * documentation and/or other materials provided with the distribution.
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| 14 | * - The name of the author may not be used to endorse or promote products
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| 15 | * derived from this software without specific prior written permission.
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| 16 | *
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 27 | */
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| 28 |
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| 29 | /** @addtogroup libext4
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| 30 | * @{
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| 31 | */
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| 32 |
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| 33 | #ifndef LIBEXT4_LIBEXT4_SUPERBLOCK_H_
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| 34 | #define LIBEXT4_LIBEXT4_SUPERBLOCK_H_
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| 35 |
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| 36 | #include <libblock.h>
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| 37 | #include <sys/types.h>
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| 38 |
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| 39 | /*
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| 40 | * Structure of the super block
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| 41 | */
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| 42 | typedef struct ext4_superblock {
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| 43 | uint32_t inodes_count; // Inodes count
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| 44 | uint32_t blocks_count_lo; // Blocks count
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| 45 | uint32_t reserved_blocks_count_lo; // Reserved blocks count
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| 46 | uint32_t free_blocks_count_lo; // Free blocks count
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| 47 | uint32_t free_inodes_count; // Free inodes count
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| 48 | uint32_t first_data_block; // First Data Block
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| 49 | uint32_t log_block_size; // Block size
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| 50 | uint32_t obso_log_frag_size; // Obsoleted fragment size
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| 51 | uint32_t blocks_per_group; // Number of blocks per group
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| 52 | uint32_t obso_frags_per_group; // Obsoleted fragments per group
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| 53 | uint32_t inodes_per_group; // Number of inodes per group
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| 54 | uint32_t mount_time; // Mount time
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| 55 | uint32_t write_time; // Write time
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| 56 | uint16_t mount_count; // Mount count
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| 57 | uint16_t max_mount_count; // Maximal mount count
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| 58 | uint16_t magic; // Magic signature
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| 59 | uint16_t state; // File system state
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| 60 | uint16_t errors; // Behaviour when detecting errors
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| 61 | uint16_t minor_rev_level; // Minor revision level
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| 62 | uint32_t last_check_time; // Time of last check
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| 63 | uint32_t check_interval; // Maximum time between checks
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| 64 | uint32_t creator_os; // Creator OS
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| 65 | uint32_t rev_level; // Revision level
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| 66 | uint16_t def_resuid; // Default uid for reserved blocks
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| 67 | uint16_t def_resgid; // Default gid for reserved blocks
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| 68 |
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| 69 | // Fields for EXT4_DYNAMIC_REV superblocks only.
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| 70 | uint32_t first_inode; // First non-reserved inode
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| 71 | uint16_t inode_size; // Size of inode structure
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| 72 | uint16_t block_group_number; // Block group number of this superblock
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| 73 | uint32_t features_compatible; // Compatible feature set
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| 74 | uint32_t features_incompatible; // Incompatible feature set
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| 75 | uint32_t features_read_only; // Readonly-compatible feature set
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| 76 | uint8_t uuid[16]; // 128-bit uuid for volume
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| 77 | char volume_name[16]; // Volume name
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| 78 | char last_mounted[64]; // Directory where last mounted
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| 79 | uint32_t algorithm_usage_bitmap; // For compression
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| 80 |
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| 81 | /*
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| 82 | * Performance hints. Directory preallocation should only
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| 83 | * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
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| 84 | */
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| 85 | uint8_t s_prealloc_blocks; // Number of blocks to try to preallocate
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| 86 | uint8_t s_prealloc_dir_blocks; // Number to preallocate for dirs
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| 87 | uint16_t s_reserved_gdt_blocks; // Per group desc for online growth
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| 88 |
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| 89 | /*
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| 90 | * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
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| 91 | */
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| 92 | uint8_t journal_uuid[16]; // UUID of journal superblock
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| 93 | uint32_t journal_inode_number; // Inode number of journal file
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| 94 | uint32_t journal_dev; // Device number of journal file
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| 95 | uint32_t last_orphan; // Head of list of inodes to delete
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| 96 | uint32_t hash_seed[4]; // HTREE hash seed
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| 97 | uint8_t default_hash_version; // Default hash version to use
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| 98 | uint8_t journal_backup_type;
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| 99 | uint16_t desc_size; // Size of group descriptor
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| 100 | uint32_t default_mount_opts; // Default mount options
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| 101 | uint32_t first_meta_bg; // First metablock block group
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| 102 | uint32_t mkfs_time; // When the filesystem was created
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| 103 | uint32_t journal_blocks[17]; // Backup of the journal inode
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| 104 |
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| 105 | /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
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| 106 | uint32_t blocks_count_hi; // Blocks count
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| 107 | uint32_t reserved_blocks_count_hi; // Reserved blocks count
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| 108 | uint32_t free_blocks_count_hi; // Free blocks count
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| 109 | uint16_t min_extra_isize; // All inodes have at least # bytes
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| 110 | uint16_t want_extra_isize; // New inodes should reserve # bytes
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| 111 | uint32_t flags; // Miscellaneous flags
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| 112 | uint16_t raid_stride; // RAID stride
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| 113 | uint16_t mmp_interval; // # seconds to wait in MMP checking
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| 114 | uint64_t mmp_block; // Block for multi-mount protection
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| 115 | uint32_t raid_stripe_width; // blocks on all data disks (N*stride)
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| 116 | uint8_t log_groups_per_flex; // FLEX_BG group size
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| 117 | uint8_t reserved_char_pad;
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| 118 | uint16_t reserved_pad;
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| 119 | uint64_t kbytes_written; // Number of lifetime kilobytes written
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| 120 | uint32_t snapshot_inum; // Inode number of active snapshot
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| 121 | uint32_t snapshot_id; // Sequential ID of active snapshot
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| 122 | uint64_t snapshot_r_blocks_count; /* reserved blocks for active snapshot's future use */
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| 123 | uint32_t snapshot_list; // inode number of the head of the on-disk snapshot list
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| 124 | uint32_t error_count; // number of fs errors
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| 125 | uint32_t first_error_time; // First time an error happened
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| 126 | uint32_t first_error_ino; // Inode involved in first error
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| 127 | uint64_t first_error_block; // block involved of first error
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| 128 | uint8_t first_error_func[32]; // Function where the error happened
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| 129 | uint32_t first_error_line; // Line number where error happened
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| 130 | uint32_t last_error_time; // Most recent time of an error
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| 131 | uint32_t last_error_ino; // Inode involved in last error
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| 132 | uint32_t last_error_line; // Line number where error happened
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| 133 | uint64_t last_error_block; // Block involved of last error
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| 134 | uint8_t last_error_func[32]; // Function where the error happened
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| 135 | uint8_t mount_opts[64];
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| 136 | uint32_t padding[112]; // Padding to the end of the block
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| 137 | } __attribute__((packed)) ext4_superblock_t;
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| 138 |
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| 139 | #define EXT4_SUPERBLOCK_MAGIC 0xEF53
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| 140 | #define EXT4_SUPERBLOCK_SIZE 1024
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| 141 | #define EXT4_SUPERBLOCK_OFFSET 1024
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| 142 |
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| 143 | #define EXT4_SUPERBLOCK_OS_LINUX 0
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| 144 | #define EXT4_SUPERBLOCK_OS_HURD 1
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| 145 |
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| 146 | /*
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| 147 | * Misc. filesystem flags
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| 148 | */
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| 149 | #define EXT4_SUPERBLOCK_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */
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| 150 | #define EXT4_SUPERBLOCK_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */
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| 151 | #define EXT4_SUPERBLOCK_FLAGS_TEST_FILESYS 0x0004 /* to test development code */
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| 152 |
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| 153 | /* Compatible features */
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| 154 | #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001
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| 155 | #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002
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| 156 | #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004
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| 157 | #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008
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| 158 | #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010
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| 159 | #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020
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| 160 |
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| 161 | /* Read-only compatible features */
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| 162 | #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
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| 163 | #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
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| 164 | #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
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| 165 | #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008
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| 166 | #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010
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| 167 | #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020
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| 168 | #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040
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| 169 |
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| 170 | /* Incompatible features */
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| 171 | #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001
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| 172 | #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002
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| 173 | #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */
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| 174 | #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */
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| 175 | #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010
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| 176 | #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */
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| 177 | #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080
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| 178 | #define EXT4_FEATURE_INCOMPAT_MMP 0x0100
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| 179 | #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200
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| 180 | #define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 /* EA in inode */
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| 181 | #define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 /* data in dirent */
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| 182 |
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| 183 | // TODO MODIFY features corresponding with implementation
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| 184 | #define EXT4_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR
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| 185 |
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| 186 | #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
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| 187 | EXT4_FEATURE_INCOMPAT_RECOVER| \
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| 188 | EXT4_FEATURE_INCOMPAT_META_BG| \
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| 189 | EXT4_FEATURE_INCOMPAT_EXTENTS| \
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| 190 | EXT4_FEATURE_INCOMPAT_64BIT| \
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| 191 | EXT4_FEATURE_INCOMPAT_FLEX_BG)
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| 192 |
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| 193 | #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
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| 194 | EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
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| 195 | EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
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| 196 | EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
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| 197 | EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
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| 198 | EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
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| 199 | EXT4_FEATURE_RO_COMPAT_HUGE_FILE)
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| 200 |
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| 201 |
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| 202 |
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| 203 | extern uint32_t ext4_superblock_get_inodes_count(ext4_superblock_t *);
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| 204 | extern void ext4_superblock_set_inodes_count(ext4_superblock_t *, uint32_t);
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| 205 | extern uint64_t ext4_superblock_get_blocks_count(ext4_superblock_t *);
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| 206 | extern void ext4_superblock_set_blocks_count(ext4_superblock_t *, uint64_t);
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| 207 | extern uint64_t ext4_superblock_get_reserved_blocks_count(ext4_superblock_t *);
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| 208 | extern void ext4_superblock_set_reserved_blocks_count(ext4_superblock_t *, uint64_t);
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| 209 | extern uint64_t ext4_superblock_get_free_blocks_count(ext4_superblock_t *);
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| 210 | extern void ext4_superblock_set_free_blocks_count(ext4_superblock_t *, uint64_t);
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| 211 | extern uint32_t ext4_superblock_get_free_inodes_count(ext4_superblock_t *);
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| 212 | extern void ext4_superblock_set_free_inodes_count(ext4_superblock_t *, uint32_t);
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| 213 | extern uint32_t ext4_superblock_get_first_data_block(ext4_superblock_t *);
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| 214 | extern void ext4_superblock_set_first_data_block(ext4_superblock_t *, uint32_t);
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| 215 | extern uint32_t ext4_superblock_get_log_block_size(ext4_superblock_t *);
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| 216 | extern void ext4_superblock_set_log_block_size(ext4_superblock_t *, uint32_t);
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| 217 | extern uint32_t ext4_superblock_get_block_size(ext4_superblock_t *);
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| 218 | extern void ext4_superblock_set_block_size(ext4_superblock_t *, uint32_t);
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| 219 | extern uint32_t ext4_superblock_get_blocks_per_group(ext4_superblock_t *);
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| 220 | extern void ext4_superblock_set_blocks_per_group(ext4_superblock_t *, uint32_t);
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| 221 | extern uint32_t ext4_superblock_get_inodes_per_group(ext4_superblock_t *);
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| 222 | extern void ext4_superblock_set_inodes_per_group(ext4_superblock_t *, uint32_t);
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| 223 | extern uint32_t ext4_superblock_get_mount_time(ext4_superblock_t *);
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| 224 | extern void ext4_superblock_set_mount_time(ext4_superblock_t *, uint32_t);
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| 225 | extern uint32_t ext4_superblock_get_write_time(ext4_superblock_t *);
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| 226 | extern void ext4_superblock_set_write_time(ext4_superblock_t *, uint32_t);
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| 227 | extern uint16_t ext4_superblock_get_mount_count(ext4_superblock_t *);
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| 228 | extern void ext4_superblock_set_mount_count(ext4_superblock_t *, uint16_t);
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| 229 | extern uint16_t ext4_superblock_get_max_mount_count(ext4_superblock_t *);
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| 230 | extern void ext4_superblock_set_max_mount_count(ext4_superblock_t *, uint16_t);
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| 231 | extern uint16_t ext4_superblock_get_magic(ext4_superblock_t *);
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| 232 | extern uint16_t ext4_superblock_get_state(ext4_superblock_t *);
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| 233 | extern void ext4_superblock_set_state(ext4_superblock_t *, uint16_t);
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| 234 | extern uint16_t ext4_superblock_get_errors(ext4_superblock_t *);
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| 235 | extern void ext4_superblock_set_errors(ext4_superblock_t *, uint16_t);
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| 236 | extern uint16_t ext4_superblock_get_minor_rev_level(ext4_superblock_t *);
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| 237 | extern void ext4_superblock_set_minor_rev_level(ext4_superblock_t *, uint16_t);
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| 238 | extern uint32_t ext4_superblock_get_last_check_time(ext4_superblock_t *);
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| 239 | extern void ext4_superblock_set_last_check_time(ext4_superblock_t *, uint32_t);
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| 240 | extern uint32_t ext4_superblock_get_check_interval(ext4_superblock_t *);
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| 241 | extern void ext4_superblock_set_check_interval(ext4_superblock_t *, uint32_t);
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| 242 | extern uint32_t ext4_superblock_get_creator_os(ext4_superblock_t *);
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| 243 | extern void ext4_superblock_set_creator_os(ext4_superblock_t *, uint32_t);
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| 244 | extern uint32_t ext4_superblock_get_rev_level(ext4_superblock_t *);
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| 245 | extern void ext4_superblock_set_rev_level(ext4_superblock_t *, uint32_t);
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| 246 | extern uint16_t ext4_superblock_get_def_resuid(ext4_superblock_t *);
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| 247 | extern void ext4_superblock_set_def_resuid(ext4_superblock_t *, uint16_t);
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| 248 | extern uint16_t ext4_superblock_get_def_resgid(ext4_superblock_t *);
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| 249 | extern void ext4_superblock_set_def_resgid(ext4_superblock_t *, uint16_t);
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| 250 | extern uint32_t ext4_superblock_get_first_inode(ext4_superblock_t *);
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| 251 | extern void ext4_superblock_set_first_inode(ext4_superblock_t *, uint32_t);
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| 252 | extern uint16_t ext4_superblock_get_inode_size(ext4_superblock_t *);
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| 253 | extern void ext4_superblock_set_inode_size(ext4_superblock_t *, uint16_t);
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| 254 | extern uint16_t ext4_superblock_get_block_group_number(ext4_superblock_t *);
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| 255 | extern void ext4_superblock_set_block_group_number(ext4_superblock_t *, uint16_t);
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| 256 | extern uint32_t ext4_superblock_get_features_compatible(ext4_superblock_t *);
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| 257 | extern void ext4_superblock_set_features_compatible(ext4_superblock_t *, uint32_t);
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| 258 | extern uint32_t ext4_superblock_get_features_incompatible(ext4_superblock_t *);
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| 259 | extern void ext4_superblock_set_features_incompatible(ext4_superblock_t *, uint32_t);
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| 260 | extern uint32_t ext4_superblock_get_features_read_only(ext4_superblock_t *);
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| 261 | extern void ext4_superblock_set_features_read_only(ext4_superblock_t *, uint32_t);
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| 262 |
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| 263 | /*
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| 264 | uint8_t s_uuid[16]; // 128-bit uuid for volume
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| 265 | char volume_name[16]; // Volume name
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| 266 | char last_mounted[64]; // Directory where last mounted
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| 267 | uint32_t s_algorithm_usage_bitmap; // For compression
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| 268 | uint8_t s_prealloc_blocks; // Number of blocks to try to preallocate
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| 269 | uint8_t s_prealloc_dir_blocks; // Number to preallocate for dirs
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| 270 | uint16_t s_reserved_gdt_blocks; // Per group desc for online growth
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| 271 | uint8_t s_journal_uuid[16]; // UUID of journal superblock
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| 272 | uint32_t s_journal_inum; // Inode number of journal file
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| 273 | uint32_t s_journal_dev; // Device number of journal file
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| 274 | */
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| 275 | extern uint32_t ext4_superblock_get_last_orphan(ext4_superblock_t *);
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| 276 | extern void ext4_superblock_set_last_orphan(ext4_superblock_t *, uint32_t);
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| 277 | extern uint32_t* ext4_superblock_get_hash_seed(ext4_superblock_t *);
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| 278 | /*
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| 279 | uint8_t s_def_hash_version; // Default hash version to use
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| 280 | uint8_t s_jnl_backup_type;
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| 281 | */
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| 282 |
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| 283 | extern uint16_t ext4_superblock_get_desc_size(ext4_superblock_t *);
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| 284 | extern void ext4_superblock_set_desc_size(ext4_superblock_t *, uint16_t);
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| 285 |
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| 286 | /*
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| 287 | uint32_t s_default_mount_opts; // Default mount options
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| 288 | uint32_t s_first_meta_bg; // First metablock block group
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| 289 | uint32_t s_mkfs_time; // When the filesystem was created
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| 290 | uint32_t s_jnl_blocks[17]; // Backup of the journal inode
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| 291 | uint16_t s_min_extra_isize; // All inodes have at least # bytes
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| 292 | uint16_t s_want_extra_isize; // New inodes should reserve # bytes
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| 293 | */
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| 294 | extern uint32_t ext4_superblock_get_flags(ext4_superblock_t *);
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| 295 | extern void ext4_superblock_set_flags(ext4_superblock_t *, uint32_t);
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| 296 | /*
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| 297 | uint16_t s_raid_stride; // RAID stride
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| 298 | uint16_t s_mmp_interval; // # seconds to wait in MMP checking
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| 299 | uint64_t s_mmp_block; // Block for multi-mount protection
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| 300 | uint32_t s_raid_stripe_width; // blocks on all data disks (N*stride)
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| 301 | uint8_t s_log_groups_per_flex; // FLEX_BG group size
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| 302 | uint8_t s_reserved_char_pad;
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| 303 | uint16_t s_reserved_pad;
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| 304 | uint64_t s_kbytes_written; // Number of lifetime kilobytes written
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| 305 | uint32_t s_snapshot_inum; // Inode number of active snapshot
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| 306 | uint32_t s_snapshot_id; // Sequential ID of active snapshot
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| 307 | uint64_t s_snapshot_r_blocks_count; // reserved blocks for active snapshot's future use
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| 308 | uint32_t s_snapshot_list; // inode number of the head of the on-disk snapshot list
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| 309 | uint32_t s_error_count; // number of fs errors
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| 310 | uint32_t s_first_error_time; // First time an error happened
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| 311 | uint32_t s_first_error_ino; // Inode involved in first error
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| 312 | uint64_t s_first_error_block; // block involved of first error
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| 313 | uint8_t s_first_error_func[32]; // Function where the error happened
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| 314 | uint32_t s_first_error_line; // Line number where error happened
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| 315 | uint32_t s_last_error_time; // Most recent time of an error
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| 316 | uint32_t s_last_error_ino; // Inode involved in last error
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| 317 | uint32_t s_last_error_line; // Line number where error happened
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| 318 | uint64_t s_last_error_block; // block involved of last error
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| 319 | uint8_t s_last_error_func[32]; // function where the error happened
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| 320 | uint8_t s_mount_opts[64];
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| 321 | */
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| 322 |
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| 323 | /* More complex superblock functions */
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| 324 | extern bool ext4_superblock_has_flag(ext4_superblock_t *, uint32_t);
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| 325 | extern bool ext4_superblock_has_feature_compatible(ext4_superblock_t *, uint32_t);
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| 326 | extern bool ext4_superblock_has_feature_incompatible(ext4_superblock_t *, uint32_t);
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| 327 | extern bool ext4_superblock_has_feature_read_only(ext4_superblock_t *, uint32_t);
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| 328 | extern int ext4_superblock_read_direct(service_id_t, ext4_superblock_t **);
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| 329 | extern int ext4_superblock_write_direct(service_id_t, ext4_superblock_t *);
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| 330 | extern int ext4_superblock_check_sanity(ext4_superblock_t *);
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| 331 |
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| 332 | extern uint32_t ext4_superblock_get_block_group_count(ext4_superblock_t *);
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| 333 | extern uint32_t ext4_superblock_get_blocks_in_group(ext4_superblock_t *, uint32_t);
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| 334 | extern uint32_t ext4_superblock_get_inodes_in_group(ext4_superblock_t *, uint32_t);
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| 335 |
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| 336 | #endif
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| 337 |
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| 338 | /**
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| 339 | * @}
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| 340 | */
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