source: mainline/uspace/lib/ext4/libext4_superblock.h@ 3711e7e

lfn serial ticket/834-toolchain-update topic/msim-upgrade topic/simplify-dev-export
Last change on this file since 3711e7e was 3711e7e, checked in by Frantisek Princ <frantisek.princ@…>, 14 years ago

Complete mounting skeleton (ported from ext2fs) - some filesystem checks during mount process still missing
  • Property mode set to 100644
File size: 7.3 KB
RevLine 
[eb91db7]1/*
2 * Copyright (c) 2011 Frantisek Princ
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 *
9 * - Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * - Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * - The name of the author may not be used to endorse or promote products
15 * derived from this software without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29/** @addtogroup libext4
30 * @{
[9875711]31 */
[eb91db7]32
33#ifndef LIBEXT4_LIBEXT4_SUPERBLOCK_H_
34#define LIBEXT4_LIBEXT4_SUPERBLOCK_H_
35
[01ab41b]36#include <libblock.h>
[9875711]37#include <sys/types.h>
38
39/*
40 * Structure of the super block
41 */
42typedef struct ext4_superblock {
[9c0c0e1]43 uint32_t inodes_count; // Inodes count
[9875711]44 uint32_t s_blocks_count_lo; // Blocks count
45 uint32_t s_r_blocks_count_lo; // Reserved blocks count
[9c0c0e1]46 uint32_t free_blocks_count_lo; // Free blocks count
47 uint32_t free_inodes_count; // Free inodes count
48 uint32_t first_data_block; // First Data Block
49 uint32_t log_block_size; // Block size
[9875711]50 uint32_t s_obso_log_frag_size; // Obsoleted fragment size
51 uint32_t s_blocks_per_group; // Number of blocks per group
52 uint32_t s_obso_frags_per_group; // Obsoleted fragments per group
[3711e7e]53 uint32_t inodes_per_group; // Number of inodes per group
[9875711]54 uint32_t s_mtime; // Mount time
55 uint32_t s_wtime; // Write time
[9c0c0e1]56 uint16_t mount_count; // Mount count
57 uint16_t max_mount_count; // Maximal mount count
58 uint16_t magic; // Magic signature
59 uint16_t state; // File system state
60 uint16_t errors; // Behaviour when detecting errors
61 uint16_t minor_rev_level; // Minor revision level
62 uint32_t last_check; // Time of last check
63 uint32_t checkinterval; // Maximum time between checks
64 uint32_t creator_os; // Creator OS
65 uint32_t rev_level; // Revision level
[9875711]66 uint16_t s_def_resuid; // Default uid for reserved blocks
67 uint16_t s_def_resgid; // Default gid for reserved blocks
68
69 // Fields for EXT4_DYNAMIC_REV superblocks only.
70 uint32_t s_first_ino; // First non-reserved inode
[3711e7e]71 uint16_t inode_size; // Size of inode structure
[9875711]72 uint16_t s_block_group_nr; // Block group number of this superblock
[9c0c0e1]73 uint32_t features_compatible; // Compatible feature set
74 uint32_t features_incompatible; // Incompatible feature set
75 uint32_t features_read_only; // Readonly-compatible feature set
[9875711]76 uint8_t s_uuid[16]; // 128-bit uuid for volume
77 char s_volume_name[16]; // Volume name
78 char s_last_mounted[64]; // Directory where last mounted
79 uint32_t s_algorithm_usage_bitmap; // For compression
80
81 /*
82 * Performance hints. Directory preallocation should only
83 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
84 */
85 uint8_t s_prealloc_blocks; // Number of blocks to try to preallocate
86 uint8_t s_prealloc_dir_blocks; // Number to preallocate for dirs
87 uint16_t s_reserved_gdt_blocks; // Per group desc for online growth
88
89 /*
90 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
91 */
92 uint8_t s_journal_uuid[16]; // UUID of journal superblock
93 uint32_t s_journal_inum; // Inode number of journal file
94 uint32_t s_journal_dev; // Device number of journal file
95 uint32_t s_last_orphan; // Head of list of inodes to delete
96 uint32_t s_hash_seed[4]; // HTREE hash seed
97 uint8_t s_def_hash_version; // Default hash version to use
98 uint8_t s_jnl_backup_type;
99 uint16_t s_desc_size; // Size of group descriptor
100 uint32_t s_default_mount_opts; // Default mount options
101 uint32_t s_first_meta_bg; // First metablock block group
102 uint32_t s_mkfs_time; // When the filesystem was created
103 uint32_t s_jnl_blocks[17]; // Backup of the journal inode
104
105 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
106 uint32_t s_blocks_count_hi; // Blocks count
107 uint32_t s_r_blocks_count_hi; // Reserved blocks count
108 uint32_t s_free_blocks_count_hi; // Free blocks count
109 uint16_t s_min_extra_isize; // All inodes have at least # bytes
110 uint16_t s_want_extra_isize; // New inodes should reserve # bytes
111 uint32_t s_flags; // Miscellaneous flags
112 uint16_t s_raid_stride; // RAID stride
113 uint16_t s_mmp_interval; // # seconds to wait in MMP checking
114 uint64_t s_mmp_block; // Block for multi-mount protection
115 uint32_t s_raid_stripe_width; // blocks on all data disks (N*stride)
116 uint8_t s_log_groups_per_flex; // FLEX_BG group size
117 uint8_t s_reserved_char_pad;
118 uint16_t s_reserved_pad;
119 uint64_t s_kbytes_written; // Number of lifetime kilobytes written
120 uint32_t s_snapshot_inum; // Inode number of active snapshot
121 uint32_t s_snapshot_id; // Sequential ID of active snapshot
122 uint64_t s_snapshot_r_blocks_count; /* reserved blocks for active snapshot's future use */
123 uint32_t s_snapshot_list; // inode number of the head of the on-disk snapshot list
124 uint32_t s_error_count; // number of fs errors
125 uint32_t s_first_error_time; // First time an error happened
126 uint32_t s_first_error_ino; // Inode involved in first error
127 uint64_t s_first_error_block; // block involved of first error
128 uint8_t s_first_error_func[32]; // Function where the error happened
129 uint32_t s_first_error_line; // Line number where error happened
130 uint32_t s_last_error_time; // Most recent time of an error
131 uint32_t s_last_error_ino; // Inode involved in last error
132 uint32_t s_last_error_line; // Line number where error happened
133 uint64_t s_last_error_block; /* block involved of last error */
134 uint8_t s_last_error_func[32]; /* function where the error happened */
135 uint8_t s_mount_opts[64];
136 uint32_t s_reserved[112]; // Padding to the end of the block
137
138} __attribute__((packed)) ext4_superblock_t;
139
[01ab41b]140#define EXT4_SUPERBLOCK_MAGIC 0xEF53
141#define EXT4_SUPERBLOCK_SIZE 1024
142#define EXT4_SUPERBLOCK_OFFSET 1024
143
[9c0c0e1]144extern uint16_t ext4_superblock_get_magic(ext4_superblock_t *);
145extern uint32_t ext4_superblock_get_first_block(ext4_superblock_t *);
[01ab41b]146extern uint32_t ext4_superblock_get_block_size_log2(ext4_superblock_t *);
147extern uint32_t ext4_superblock_get_block_size(ext4_superblock_t *);
[9c0c0e1]148extern uint32_t ext4_superblock_get_rev_level(ext4_superblock_t *);
[3711e7e]149extern uint16_t ext4_superblock_get_inode_size(ext4_superblock_t *);
150extern uint32_t ext4_superblock_get_inodes_per_group(ext4_superblock_t *);
[9c0c0e1]151extern uint32_t ext4_superblock_get_features_compatible(ext4_superblock_t *);
152extern uint32_t ext4_superblock_get_features_incompatible(ext4_superblock_t *);
153extern uint32_t ext4_superblock_get_features_read_only(ext4_superblock_t *);
[01ab41b]154
155extern int ext4_superblock_read_direct(service_id_t, ext4_superblock_t **);
156extern int ext4_superblock_check_sanity(ext4_superblock_t *);
[eb91db7]157
158#endif
159
160/**
161 * @}
162 */
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