Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1 | /* |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2 | * linux/include/linux/ext4_fs.h |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 3 | * |
| 4 | * Copyright (C) 1992, 1993, 1994, 1995 |
| 5 | * Remy Card (card@masi.ibp.fr) |
| 6 | * Laboratoire MASI - Institut Blaise Pascal |
| 7 | * Universite Pierre et Marie Curie (Paris VI) |
| 8 | * |
| 9 | * from |
| 10 | * |
| 11 | * linux/include/linux/minix_fs.h |
| 12 | * |
| 13 | * Copyright (C) 1991, 1992 Linus Torvalds |
| 14 | */ |
| 15 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 16 | #ifndef _LINUX_EXT4_FS_H |
| 17 | #define _LINUX_EXT4_FS_H |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 18 | |
| 19 | #include <linux/types.h> |
Mingming Cao | 3a5b2ec | 2006-10-11 01:21:05 -0700 | [diff] [blame] | 20 | #include <linux/blkdev.h> |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 21 | #include <linux/magic.h> |
| 22 | |
| 23 | /* |
| 24 | * The second extended filesystem constants/structures |
| 25 | */ |
| 26 | |
| 27 | /* |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 28 | * Define EXT4FS_DEBUG to produce debug messages |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 29 | */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 30 | #undef EXT4FS_DEBUG |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 31 | |
| 32 | /* |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 33 | * Define EXT4_RESERVATION to reserve data blocks for expanding files |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 34 | */ |
Dave Kleikamp | 8c55e20 | 2007-05-24 13:04:54 -0400 | [diff] [blame] | 35 | #define EXT4_DEFAULT_RESERVE_BLOCKS 8 |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 36 | /*max window size: 1024(direct blocks) + 3([t,d]indirect blocks) */ |
Dave Kleikamp | 8c55e20 | 2007-05-24 13:04:54 -0400 | [diff] [blame] | 37 | #define EXT4_MAX_RESERVE_BLOCKS 1027 |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 38 | #define EXT4_RESERVE_WINDOW_NOT_ALLOCATED 0 |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 39 | |
| 40 | /* |
| 41 | * Debug code |
| 42 | */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 43 | #ifdef EXT4FS_DEBUG |
| 44 | #define ext4_debug(f, a...) \ |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 45 | do { \ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 46 | printk (KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \ |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 47 | __FILE__, __LINE__, __FUNCTION__); \ |
| 48 | printk (KERN_DEBUG f, ## a); \ |
| 49 | } while (0) |
| 50 | #else |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 51 | #define ext4_debug(f, a...) do {} while (0) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 52 | #endif |
| 53 | |
| 54 | /* |
| 55 | * Special inodes numbers |
| 56 | */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 57 | #define EXT4_BAD_INO 1 /* Bad blocks inode */ |
| 58 | #define EXT4_ROOT_INO 2 /* Root inode */ |
| 59 | #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */ |
| 60 | #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */ |
| 61 | #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */ |
| 62 | #define EXT4_JOURNAL_INO 8 /* Journal inode */ |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 63 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 64 | /* First non-reserved inode for old ext4 filesystems */ |
| 65 | #define EXT4_GOOD_OLD_FIRST_INO 11 |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 66 | |
| 67 | /* |
| 68 | * Maximal count of links to a file |
| 69 | */ |
Andreas Dilger | f8628a1 | 2007-07-18 08:38:01 -0400 | [diff] [blame] | 70 | #define EXT4_LINK_MAX 65000 |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 71 | |
| 72 | /* |
| 73 | * Macro-instructions used to manage several block sizes |
| 74 | */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 75 | #define EXT4_MIN_BLOCK_SIZE 1024 |
| 76 | #define EXT4_MAX_BLOCK_SIZE 4096 |
| 77 | #define EXT4_MIN_BLOCK_LOG_SIZE 10 |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 78 | #ifdef __KERNEL__ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 79 | # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 80 | #else |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 81 | # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 82 | #endif |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 83 | #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof (__u32)) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 84 | #ifdef __KERNEL__ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 85 | # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 86 | #else |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 87 | # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 88 | #endif |
| 89 | #ifdef __KERNEL__ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 90 | #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits) |
| 91 | #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size) |
| 92 | #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 93 | #else |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 94 | #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ |
| 95 | EXT4_GOOD_OLD_INODE_SIZE : \ |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 96 | (s)->s_inode_size) |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 97 | #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ |
| 98 | EXT4_GOOD_OLD_FIRST_INO : \ |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 99 | (s)->s_first_ino) |
| 100 | #endif |
Amit Arora | a2df2a6 | 2007-07-17 21:42:41 -0400 | [diff] [blame] | 101 | #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits))) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 102 | |
| 103 | /* |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 104 | * Structure of a blocks group descriptor |
| 105 | */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 106 | struct ext4_group_desc |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 107 | { |
| 108 | __le32 bg_block_bitmap; /* Blocks bitmap block */ |
| 109 | __le32 bg_inode_bitmap; /* Inodes bitmap block */ |
| 110 | __le32 bg_inode_table; /* Inodes table block */ |
| 111 | __le16 bg_free_blocks_count; /* Free blocks count */ |
| 112 | __le16 bg_free_inodes_count; /* Free inodes count */ |
| 113 | __le16 bg_used_dirs_count; /* Directories count */ |
Laurent Vivier | bd81d8e | 2006-10-11 01:21:10 -0700 | [diff] [blame] | 114 | __u16 bg_flags; |
Alexandre Ratchov | 8fadc14 | 2006-10-11 01:21:15 -0700 | [diff] [blame] | 115 | __u32 bg_reserved[3]; |
| 116 | __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */ |
| 117 | __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */ |
| 118 | __le32 bg_inode_table_hi; /* Inodes table block MSB */ |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 119 | }; |
| 120 | |
Laurent Vivier | bd81d8e | 2006-10-11 01:21:10 -0700 | [diff] [blame] | 121 | #ifdef __KERNEL__ |
| 122 | #include <linux/ext4_fs_i.h> |
| 123 | #include <linux/ext4_fs_sb.h> |
| 124 | #endif |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 125 | /* |
| 126 | * Macro-instructions used to manage group descriptors |
| 127 | */ |
Alexandre Ratchov | 0d1ee42 | 2006-10-11 01:21:14 -0700 | [diff] [blame] | 128 | #define EXT4_MIN_DESC_SIZE 32 |
Alexandre Ratchov | 8fadc14 | 2006-10-11 01:21:15 -0700 | [diff] [blame] | 129 | #define EXT4_MIN_DESC_SIZE_64BIT 64 |
Alexandre Ratchov | 0d1ee42 | 2006-10-11 01:21:14 -0700 | [diff] [blame] | 130 | #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE |
| 131 | #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 132 | #ifdef __KERNEL__ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 133 | # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group) |
| 134 | # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block) |
| 135 | # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group) |
| 136 | # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 137 | #else |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 138 | # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group) |
Alexandre Ratchov | 0d1ee42 | 2006-10-11 01:21:14 -0700 | [diff] [blame] | 139 | # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s)) |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 140 | # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 141 | #endif |
| 142 | |
| 143 | /* |
| 144 | * Constants relative to the data blocks |
| 145 | */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 146 | #define EXT4_NDIR_BLOCKS 12 |
| 147 | #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS |
| 148 | #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1) |
| 149 | #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1) |
| 150 | #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 151 | |
| 152 | /* |
| 153 | * Inode flags |
| 154 | */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 155 | #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */ |
| 156 | #define EXT4_UNRM_FL 0x00000002 /* Undelete */ |
| 157 | #define EXT4_COMPR_FL 0x00000004 /* Compress file */ |
| 158 | #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */ |
| 159 | #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */ |
| 160 | #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */ |
| 161 | #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */ |
| 162 | #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */ |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 163 | /* Reserved for compression usage... */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 164 | #define EXT4_DIRTY_FL 0x00000100 |
| 165 | #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ |
| 166 | #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */ |
| 167 | #define EXT4_ECOMPR_FL 0x00000800 /* Compression error */ |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 168 | /* End compression flags --- maybe not all used */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 169 | #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */ |
| 170 | #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */ |
| 171 | #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */ |
| 172 | #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */ |
| 173 | #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */ |
| 174 | #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/ |
| 175 | #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */ |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 176 | #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */ |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 177 | |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 178 | #define EXT4_FL_USER_VISIBLE 0x000BDFFF /* User visible flags */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 179 | #define EXT4_FL_USER_MODIFIABLE 0x000380FF /* User modifiable flags */ |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 180 | |
| 181 | /* |
| 182 | * Inode dynamic state flags |
| 183 | */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 184 | #define EXT4_STATE_JDATA 0x00000001 /* journaled data exists */ |
| 185 | #define EXT4_STATE_NEW 0x00000002 /* inode is newly created */ |
| 186 | #define EXT4_STATE_XATTR 0x00000004 /* has in-inode xattrs */ |
Kalpak Shah | 6dd4ee7 | 2007-07-18 09:19:57 -0400 | [diff] [blame] | 187 | #define EXT4_STATE_NO_EXPAND 0x00000008 /* No space for expansion */ |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 188 | |
| 189 | /* Used to pass group descriptor data when online resize is done */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 190 | struct ext4_new_group_input { |
Dave Kleikamp | 8c55e20 | 2007-05-24 13:04:54 -0400 | [diff] [blame] | 191 | __u32 group; /* Group number for this data */ |
| 192 | __u64 block_bitmap; /* Absolute block number of block bitmap */ |
| 193 | __u64 inode_bitmap; /* Absolute block number of inode bitmap */ |
| 194 | __u64 inode_table; /* Absolute block number of inode table start */ |
| 195 | __u32 blocks_count; /* Total number of blocks in this group */ |
| 196 | __u16 reserved_blocks; /* Number of reserved blocks in this group */ |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 197 | __u16 unused; |
| 198 | }; |
| 199 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 200 | /* The struct ext4_new_group_input in kernel space, with free_blocks_count */ |
| 201 | struct ext4_new_group_data { |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 202 | __u32 group; |
Laurent Vivier | bd81d8e | 2006-10-11 01:21:10 -0700 | [diff] [blame] | 203 | __u64 block_bitmap; |
| 204 | __u64 inode_bitmap; |
| 205 | __u64 inode_table; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 206 | __u32 blocks_count; |
| 207 | __u16 reserved_blocks; |
| 208 | __u16 unused; |
| 209 | __u32 free_blocks_count; |
| 210 | }; |
| 211 | |
Amit Arora | a2df2a6 | 2007-07-17 21:42:41 -0400 | [diff] [blame] | 212 | /* |
| 213 | * Following is used by preallocation code to tell get_blocks() that we |
| 214 | * want uninitialzed extents. |
| 215 | */ |
| 216 | #define EXT4_CREATE_UNINITIALIZED_EXT 2 |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 217 | |
| 218 | /* |
| 219 | * ioctl commands |
| 220 | */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 221 | #define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS |
| 222 | #define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS |
| 223 | #define EXT4_IOC_GETVERSION _IOR('f', 3, long) |
| 224 | #define EXT4_IOC_SETVERSION _IOW('f', 4, long) |
| 225 | #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long) |
| 226 | #define EXT4_IOC_GROUP_ADD _IOW('f', 8,struct ext4_new_group_input) |
| 227 | #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION |
| 228 | #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION |
Jose R. Santos | e23291b | 2007-07-18 08:57:06 -0400 | [diff] [blame] | 229 | #ifdef CONFIG_JBD2_DEBUG |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 230 | #define EXT4_IOC_WAIT_FOR_READONLY _IOR('f', 99, long) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 231 | #endif |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 232 | #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long) |
| 233 | #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 234 | |
| 235 | /* |
| 236 | * ioctl commands in 32 bit emulation |
| 237 | */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 238 | #define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS |
| 239 | #define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS |
| 240 | #define EXT4_IOC32_GETVERSION _IOR('f', 3, int) |
| 241 | #define EXT4_IOC32_SETVERSION _IOW('f', 4, int) |
| 242 | #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int) |
| 243 | #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int) |
| 244 | #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int) |
Jose R. Santos | e23291b | 2007-07-18 08:57:06 -0400 | [diff] [blame] | 245 | #ifdef CONFIG_JBD2_DEBUG |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 246 | #define EXT4_IOC32_WAIT_FOR_READONLY _IOR('f', 99, int) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 247 | #endif |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 248 | #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION |
| 249 | #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 250 | |
| 251 | |
| 252 | /* |
| 253 | * Mount options |
| 254 | */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 255 | struct ext4_mount_options { |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 256 | unsigned long s_mount_opt; |
| 257 | uid_t s_resuid; |
| 258 | gid_t s_resgid; |
| 259 | unsigned long s_commit_interval; |
| 260 | #ifdef CONFIG_QUOTA |
| 261 | int s_jquota_fmt; |
| 262 | char *s_qf_names[MAXQUOTAS]; |
| 263 | #endif |
| 264 | }; |
| 265 | |
| 266 | /* |
| 267 | * Structure of an inode on the disk |
| 268 | */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 269 | struct ext4_inode { |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 270 | __le16 i_mode; /* File mode */ |
| 271 | __le16 i_uid; /* Low 16 bits of Owner Uid */ |
| 272 | __le32 i_size; /* Size in bytes */ |
| 273 | __le32 i_atime; /* Access time */ |
Kalpak Shah | ef7f383 | 2007-07-18 09:15:20 -0400 | [diff] [blame] | 274 | __le32 i_ctime; /* Inode Change time */ |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 275 | __le32 i_mtime; /* Modification time */ |
| 276 | __le32 i_dtime; /* Deletion Time */ |
| 277 | __le16 i_gid; /* Low 16 bits of Group Id */ |
| 278 | __le16 i_links_count; /* Links count */ |
| 279 | __le32 i_blocks; /* Blocks count */ |
| 280 | __le32 i_flags; /* File flags */ |
| 281 | union { |
| 282 | struct { |
| 283 | __u32 l_i_reserved1; |
| 284 | } linux1; |
| 285 | struct { |
| 286 | __u32 h_i_translator; |
| 287 | } hurd1; |
| 288 | struct { |
| 289 | __u32 m_i_reserved1; |
| 290 | } masix1; |
| 291 | } osd1; /* OS dependent 1 */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 292 | __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */ |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 293 | __le32 i_generation; /* File version (for NFS) */ |
| 294 | __le32 i_file_acl; /* File ACL */ |
| 295 | __le32 i_dir_acl; /* Directory ACL */ |
Coly Li | f077d0d | 2007-10-16 18:38:25 -0400 | [diff] [blame] | 296 | __le32 i_obso_faddr; /* Obsoleted fragment address */ |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 297 | union { |
| 298 | struct { |
Coly Li | f077d0d | 2007-10-16 18:38:25 -0400 | [diff] [blame] | 299 | __le16 l_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ |
Badari Pulavarty | a1ddeb7 | 2006-10-11 01:21:09 -0700 | [diff] [blame] | 300 | __le16 l_i_file_acl_high; |
Dave Kleikamp | 8c55e20 | 2007-05-24 13:04:54 -0400 | [diff] [blame] | 301 | __le16 l_i_uid_high; /* these 2 fields */ |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 302 | __le16 l_i_gid_high; /* were reserved2[0] */ |
| 303 | __u32 l_i_reserved2; |
| 304 | } linux2; |
| 305 | struct { |
Coly Li | f077d0d | 2007-10-16 18:38:25 -0400 | [diff] [blame] | 306 | __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 307 | __u16 h_i_mode_high; |
| 308 | __u16 h_i_uid_high; |
| 309 | __u16 h_i_gid_high; |
| 310 | __u32 h_i_author; |
| 311 | } hurd2; |
| 312 | struct { |
Coly Li | f077d0d | 2007-10-16 18:38:25 -0400 | [diff] [blame] | 313 | __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ |
Badari Pulavarty | a1ddeb7 | 2006-10-11 01:21:09 -0700 | [diff] [blame] | 314 | __le16 m_i_file_acl_high; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 315 | __u32 m_i_reserved2[2]; |
| 316 | } masix2; |
| 317 | } osd2; /* OS dependent 2 */ |
| 318 | __le16 i_extra_isize; |
| 319 | __le16 i_pad1; |
Kalpak Shah | ef7f383 | 2007-07-18 09:15:20 -0400 | [diff] [blame] | 320 | __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */ |
| 321 | __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */ |
| 322 | __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */ |
| 323 | __le32 i_crtime; /* File Creation time */ |
| 324 | __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */ |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 325 | }; |
| 326 | |
| 327 | #define i_size_high i_dir_acl |
| 328 | |
Kalpak Shah | ef7f383 | 2007-07-18 09:15:20 -0400 | [diff] [blame] | 329 | #define EXT4_EPOCH_BITS 2 |
| 330 | #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1) |
| 331 | #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS) |
| 332 | |
| 333 | /* |
| 334 | * Extended fields will fit into an inode if the filesystem was formatted |
| 335 | * with large inodes (-I 256 or larger) and there are not currently any EAs |
| 336 | * consuming all of the available space. For new inodes we always reserve |
| 337 | * enough space for the kernel's known extended fields, but for inodes |
| 338 | * created with an old kernel this might not have been the case. None of |
| 339 | * the extended inode fields is critical for correct filesystem operation. |
| 340 | * This macro checks if a certain field fits in the inode. Note that |
| 341 | * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize |
| 342 | */ |
| 343 | #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \ |
| 344 | ((offsetof(typeof(*ext4_inode), field) + \ |
| 345 | sizeof((ext4_inode)->field)) \ |
| 346 | <= (EXT4_GOOD_OLD_INODE_SIZE + \ |
| 347 | (einode)->i_extra_isize)) \ |
| 348 | |
| 349 | static inline __le32 ext4_encode_extra_time(struct timespec *time) |
| 350 | { |
| 351 | return cpu_to_le32((sizeof(time->tv_sec) > 4 ? |
| 352 | time->tv_sec >> 32 : 0) | |
| 353 | ((time->tv_nsec << 2) & EXT4_NSEC_MASK)); |
| 354 | } |
| 355 | |
| 356 | static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra) |
| 357 | { |
| 358 | if (sizeof(time->tv_sec) > 4) |
| 359 | time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) |
| 360 | << 32; |
| 361 | time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> 2; |
| 362 | } |
| 363 | |
| 364 | #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \ |
| 365 | do { \ |
| 366 | (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \ |
| 367 | if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \ |
| 368 | (raw_inode)->xtime ## _extra = \ |
| 369 | ext4_encode_extra_time(&(inode)->xtime); \ |
| 370 | } while (0) |
| 371 | |
| 372 | #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \ |
| 373 | do { \ |
| 374 | if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ |
| 375 | (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \ |
| 376 | if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ |
| 377 | (raw_inode)->xtime ## _extra = \ |
| 378 | ext4_encode_extra_time(&(einode)->xtime); \ |
| 379 | } while (0) |
| 380 | |
| 381 | #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \ |
| 382 | do { \ |
| 383 | (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \ |
| 384 | if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \ |
| 385 | ext4_decode_extra_time(&(inode)->xtime, \ |
| 386 | raw_inode->xtime ## _extra); \ |
| 387 | } while (0) |
| 388 | |
| 389 | #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \ |
| 390 | do { \ |
| 391 | if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ |
| 392 | (einode)->xtime.tv_sec = \ |
| 393 | (signed)le32_to_cpu((raw_inode)->xtime); \ |
| 394 | if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ |
| 395 | ext4_decode_extra_time(&(einode)->xtime, \ |
| 396 | raw_inode->xtime ## _extra); \ |
| 397 | } while (0) |
| 398 | |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 399 | #if defined(__KERNEL__) || defined(__linux__) |
| 400 | #define i_reserved1 osd1.linux1.l_i_reserved1 |
Badari Pulavarty | a1ddeb7 | 2006-10-11 01:21:09 -0700 | [diff] [blame] | 401 | #define i_file_acl_high osd2.linux2.l_i_file_acl_high |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 402 | #define i_uid_low i_uid |
| 403 | #define i_gid_low i_gid |
| 404 | #define i_uid_high osd2.linux2.l_i_uid_high |
| 405 | #define i_gid_high osd2.linux2.l_i_gid_high |
| 406 | #define i_reserved2 osd2.linux2.l_i_reserved2 |
| 407 | |
| 408 | #elif defined(__GNU__) |
| 409 | |
| 410 | #define i_translator osd1.hurd1.h_i_translator |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 411 | #define i_uid_high osd2.hurd2.h_i_uid_high |
| 412 | #define i_gid_high osd2.hurd2.h_i_gid_high |
| 413 | #define i_author osd2.hurd2.h_i_author |
| 414 | |
| 415 | #elif defined(__masix__) |
| 416 | |
| 417 | #define i_reserved1 osd1.masix1.m_i_reserved1 |
Badari Pulavarty | a1ddeb7 | 2006-10-11 01:21:09 -0700 | [diff] [blame] | 418 | #define i_file_acl_high osd2.masix2.m_i_file_acl_high |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 419 | #define i_reserved2 osd2.masix2.m_i_reserved2 |
| 420 | |
| 421 | #endif /* defined(__KERNEL__) || defined(__linux__) */ |
| 422 | |
| 423 | /* |
| 424 | * File system states |
| 425 | */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 426 | #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */ |
| 427 | #define EXT4_ERROR_FS 0x0002 /* Errors detected */ |
| 428 | #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */ |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 429 | |
| 430 | /* |
| 431 | * Mount flags |
| 432 | */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 433 | #define EXT4_MOUNT_CHECK 0x00001 /* Do mount-time checks */ |
| 434 | #define EXT4_MOUNT_OLDALLOC 0x00002 /* Don't use the new Orlov allocator */ |
| 435 | #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */ |
| 436 | #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */ |
| 437 | #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */ |
| 438 | #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */ |
| 439 | #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */ |
| 440 | #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */ |
| 441 | #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/ |
| 442 | #define EXT4_MOUNT_ABORT 0x00200 /* Fatal error detected */ |
| 443 | #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */ |
| 444 | #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */ |
| 445 | #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */ |
| 446 | #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */ |
| 447 | #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */ |
| 448 | #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */ |
| 449 | #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */ |
| 450 | #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */ |
| 451 | #define EXT4_MOUNT_RESERVATION 0x10000 /* Preallocation */ |
| 452 | #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */ |
| 453 | #define EXT4_MOUNT_NOBH 0x40000 /* No bufferheads */ |
| 454 | #define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */ |
| 455 | #define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */ |
| 456 | #define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */ |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 457 | #define EXT4_MOUNT_EXTENTS 0x400000 /* Extents support */ |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 458 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 459 | /* Compatibility, for having both ext2_fs.h and ext4_fs.h included at once */ |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 460 | #ifndef _LINUX_EXT2_FS_H |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 461 | #define clear_opt(o, opt) o &= ~EXT4_MOUNT_##opt |
| 462 | #define set_opt(o, opt) o |= EXT4_MOUNT_##opt |
| 463 | #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \ |
| 464 | EXT4_MOUNT_##opt) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 465 | #else |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 466 | #define EXT2_MOUNT_NOLOAD EXT4_MOUNT_NOLOAD |
| 467 | #define EXT2_MOUNT_ABORT EXT4_MOUNT_ABORT |
| 468 | #define EXT2_MOUNT_DATA_FLAGS EXT4_MOUNT_DATA_FLAGS |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 469 | #endif |
| 470 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 471 | #define ext4_set_bit ext2_set_bit |
| 472 | #define ext4_set_bit_atomic ext2_set_bit_atomic |
| 473 | #define ext4_clear_bit ext2_clear_bit |
| 474 | #define ext4_clear_bit_atomic ext2_clear_bit_atomic |
| 475 | #define ext4_test_bit ext2_test_bit |
| 476 | #define ext4_find_first_zero_bit ext2_find_first_zero_bit |
| 477 | #define ext4_find_next_zero_bit ext2_find_next_zero_bit |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 478 | |
| 479 | /* |
| 480 | * Maximal mount counts between two filesystem checks |
| 481 | */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 482 | #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ |
| 483 | #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */ |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 484 | |
| 485 | /* |
| 486 | * Behaviour when detecting errors |
| 487 | */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 488 | #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */ |
| 489 | #define EXT4_ERRORS_RO 2 /* Remount fs read-only */ |
| 490 | #define EXT4_ERRORS_PANIC 3 /* Panic */ |
| 491 | #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 492 | |
| 493 | /* |
| 494 | * Structure of the super block |
| 495 | */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 496 | struct ext4_super_block { |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 497 | /*00*/ __le32 s_inodes_count; /* Inodes count */ |
| 498 | __le32 s_blocks_count; /* Blocks count */ |
| 499 | __le32 s_r_blocks_count; /* Reserved blocks count */ |
| 500 | __le32 s_free_blocks_count; /* Free blocks count */ |
| 501 | /*10*/ __le32 s_free_inodes_count; /* Free inodes count */ |
| 502 | __le32 s_first_data_block; /* First Data Block */ |
| 503 | __le32 s_log_block_size; /* Block size */ |
Coly Li | f077d0d | 2007-10-16 18:38:25 -0400 | [diff] [blame] | 504 | __le32 s_obso_log_frag_size; /* Obsoleted fragment size */ |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 505 | /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */ |
Coly Li | f077d0d | 2007-10-16 18:38:25 -0400 | [diff] [blame] | 506 | __le32 s_obso_frags_per_group; /* Obsoleted fragments per group */ |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 507 | __le32 s_inodes_per_group; /* # Inodes per group */ |
| 508 | __le32 s_mtime; /* Mount time */ |
| 509 | /*30*/ __le32 s_wtime; /* Write time */ |
| 510 | __le16 s_mnt_count; /* Mount count */ |
| 511 | __le16 s_max_mnt_count; /* Maximal mount count */ |
| 512 | __le16 s_magic; /* Magic signature */ |
| 513 | __le16 s_state; /* File system state */ |
| 514 | __le16 s_errors; /* Behaviour when detecting errors */ |
| 515 | __le16 s_minor_rev_level; /* minor revision level */ |
| 516 | /*40*/ __le32 s_lastcheck; /* time of last check */ |
| 517 | __le32 s_checkinterval; /* max. time between checks */ |
| 518 | __le32 s_creator_os; /* OS */ |
| 519 | __le32 s_rev_level; /* Revision level */ |
| 520 | /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */ |
| 521 | __le16 s_def_resgid; /* Default gid for reserved blocks */ |
| 522 | /* |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 523 | * These fields are for EXT4_DYNAMIC_REV superblocks only. |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 524 | * |
| 525 | * Note: the difference between the compatible feature set and |
| 526 | * the incompatible feature set is that if there is a bit set |
| 527 | * in the incompatible feature set that the kernel doesn't |
| 528 | * know about, it should refuse to mount the filesystem. |
| 529 | * |
| 530 | * e2fsck's requirements are more strict; if it doesn't know |
| 531 | * about a feature in either the compatible or incompatible |
| 532 | * feature set, it must abort and not try to meddle with |
| 533 | * things it doesn't understand... |
| 534 | */ |
| 535 | __le32 s_first_ino; /* First non-reserved inode */ |
Alexandre Ratchov | 0d1ee42 | 2006-10-11 01:21:14 -0700 | [diff] [blame] | 536 | __le16 s_inode_size; /* size of inode structure */ |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 537 | __le16 s_block_group_nr; /* block group # of this superblock */ |
| 538 | __le32 s_feature_compat; /* compatible feature set */ |
| 539 | /*60*/ __le32 s_feature_incompat; /* incompatible feature set */ |
| 540 | __le32 s_feature_ro_compat; /* readonly-compatible feature set */ |
| 541 | /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */ |
| 542 | /*78*/ char s_volume_name[16]; /* volume name */ |
| 543 | /*88*/ char s_last_mounted[64]; /* directory where last mounted */ |
| 544 | /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */ |
| 545 | /* |
| 546 | * Performance hints. Directory preallocation should only |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 547 | * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on. |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 548 | */ |
| 549 | __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ |
| 550 | __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ |
| 551 | __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */ |
| 552 | /* |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 553 | * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set. |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 554 | */ |
| 555 | /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */ |
| 556 | /*E0*/ __le32 s_journal_inum; /* inode number of journal file */ |
| 557 | __le32 s_journal_dev; /* device number of journal file */ |
| 558 | __le32 s_last_orphan; /* start of list of inodes to delete */ |
| 559 | __le32 s_hash_seed[4]; /* HTREE hash seed */ |
| 560 | __u8 s_def_hash_version; /* Default hash version to use */ |
| 561 | __u8 s_reserved_char_pad; |
Alexandre Ratchov | 0d1ee42 | 2006-10-11 01:21:14 -0700 | [diff] [blame] | 562 | __le16 s_desc_size; /* size of group descriptor */ |
Laurent Vivier | bd81d8e | 2006-10-11 01:21:10 -0700 | [diff] [blame] | 563 | /*100*/ __le32 s_default_mount_opts; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 564 | __le32 s_first_meta_bg; /* First metablock block group */ |
Laurent Vivier | bd81d8e | 2006-10-11 01:21:10 -0700 | [diff] [blame] | 565 | __le32 s_mkfs_time; /* When the filesystem was created */ |
| 566 | __le32 s_jnl_blocks[17]; /* Backup of the journal inode */ |
| 567 | /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */ |
| 568 | /*150*/ __le32 s_blocks_count_hi; /* Blocks count */ |
| 569 | __le32 s_r_blocks_count_hi; /* Reserved blocks count */ |
| 570 | __le32 s_free_blocks_count_hi; /* Free blocks count */ |
Theodore Ts'o | 436bd75 | 2007-05-31 12:43:28 -0400 | [diff] [blame] | 571 | __u16 s_min_extra_isize; /* All inodes have at least # bytes */ |
| 572 | __u16 s_want_extra_isize; /* New inodes should reserve # bytes */ |
| 573 | __u32 s_flags; /* Miscellaneous flags */ |
| 574 | __u16 s_raid_stride; /* RAID stride */ |
| 575 | __u16 s_mmp_interval; /* # seconds to wait in MMP checking */ |
| 576 | __u64 s_mmp_block; /* Block for multi-mount protection */ |
| 577 | __u32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/ |
| 578 | __u32 s_reserved[163]; /* Padding to the end of the block */ |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 579 | }; |
| 580 | |
| 581 | #ifdef __KERNEL__ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 582 | static inline struct ext4_sb_info * EXT4_SB(struct super_block *sb) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 583 | { |
| 584 | return sb->s_fs_info; |
| 585 | } |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 586 | static inline struct ext4_inode_info *EXT4_I(struct inode *inode) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 587 | { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 588 | return container_of(inode, struct ext4_inode_info, vfs_inode); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 589 | } |
| 590 | |
Kalpak Shah | ef7f383 | 2007-07-18 09:15:20 -0400 | [diff] [blame] | 591 | static inline struct timespec ext4_current_time(struct inode *inode) |
| 592 | { |
| 593 | return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ? |
| 594 | current_fs_time(inode->i_sb) : CURRENT_TIME_SEC; |
| 595 | } |
| 596 | |
| 597 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 598 | static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 599 | { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 600 | return ino == EXT4_ROOT_INO || |
| 601 | ino == EXT4_JOURNAL_INO || |
| 602 | ino == EXT4_RESIZE_INO || |
| 603 | (ino >= EXT4_FIRST_INO(sb) && |
| 604 | ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count)); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 605 | } |
| 606 | #else |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 607 | /* Assume that user mode programs are passing in an ext4fs superblock, not |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 608 | * a kernel struct super_block. This will allow us to call the feature-test |
| 609 | * macros from user land. */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 610 | #define EXT4_SB(sb) (sb) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 611 | #endif |
| 612 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 613 | #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 614 | |
| 615 | /* |
| 616 | * Codes for operating systems |
| 617 | */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 618 | #define EXT4_OS_LINUX 0 |
| 619 | #define EXT4_OS_HURD 1 |
| 620 | #define EXT4_OS_MASIX 2 |
| 621 | #define EXT4_OS_FREEBSD 3 |
| 622 | #define EXT4_OS_LITES 4 |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 623 | |
| 624 | /* |
| 625 | * Revision levels |
| 626 | */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 627 | #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */ |
| 628 | #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 629 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 630 | #define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV |
| 631 | #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 632 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 633 | #define EXT4_GOOD_OLD_INODE_SIZE 128 |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 634 | |
| 635 | /* |
| 636 | * Feature set definitions |
| 637 | */ |
| 638 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 639 | #define EXT4_HAS_COMPAT_FEATURE(sb,mask) \ |
| 640 | ( EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask) ) |
| 641 | #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \ |
| 642 | ( EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask) ) |
| 643 | #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \ |
| 644 | ( EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask) ) |
| 645 | #define EXT4_SET_COMPAT_FEATURE(sb,mask) \ |
| 646 | EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask) |
| 647 | #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \ |
| 648 | EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask) |
| 649 | #define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \ |
| 650 | EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask) |
| 651 | #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \ |
| 652 | EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask) |
| 653 | #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \ |
| 654 | EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask) |
| 655 | #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \ |
| 656 | EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 657 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 658 | #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001 |
| 659 | #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002 |
| 660 | #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004 |
| 661 | #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008 |
| 662 | #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010 |
| 663 | #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020 |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 664 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 665 | #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 |
| 666 | #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 |
| 667 | #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 |
Andreas Dilger | f8628a1 | 2007-07-18 08:38:01 -0400 | [diff] [blame] | 668 | #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020 |
Kalpak Shah | ef7f383 | 2007-07-18 09:15:20 -0400 | [diff] [blame] | 669 | #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040 |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 670 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 671 | #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001 |
| 672 | #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002 |
| 673 | #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */ |
| 674 | #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */ |
| 675 | #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010 |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 676 | #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */ |
Laurent Vivier | bd81d8e | 2006-10-11 01:21:10 -0700 | [diff] [blame] | 677 | #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080 |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 678 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 679 | #define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR |
| 680 | #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ |
| 681 | EXT4_FEATURE_INCOMPAT_RECOVER| \ |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 682 | EXT4_FEATURE_INCOMPAT_META_BG| \ |
Laurent Vivier | bd81d8e | 2006-10-11 01:21:10 -0700 | [diff] [blame] | 683 | EXT4_FEATURE_INCOMPAT_EXTENTS| \ |
| 684 | EXT4_FEATURE_INCOMPAT_64BIT) |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 685 | #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ |
| 686 | EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ |
Andreas Dilger | f8628a1 | 2007-07-18 08:38:01 -0400 | [diff] [blame] | 687 | EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \ |
Kalpak Shah | ef7f383 | 2007-07-18 09:15:20 -0400 | [diff] [blame] | 688 | EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 689 | EXT4_FEATURE_RO_COMPAT_BTREE_DIR) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 690 | |
| 691 | /* |
| 692 | * Default values for user and/or group using reserved blocks |
| 693 | */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 694 | #define EXT4_DEF_RESUID 0 |
| 695 | #define EXT4_DEF_RESGID 0 |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 696 | |
| 697 | /* |
| 698 | * Default mount options |
| 699 | */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 700 | #define EXT4_DEFM_DEBUG 0x0001 |
| 701 | #define EXT4_DEFM_BSDGROUPS 0x0002 |
| 702 | #define EXT4_DEFM_XATTR_USER 0x0004 |
| 703 | #define EXT4_DEFM_ACL 0x0008 |
| 704 | #define EXT4_DEFM_UID16 0x0010 |
| 705 | #define EXT4_DEFM_JMODE 0x0060 |
| 706 | #define EXT4_DEFM_JMODE_DATA 0x0020 |
| 707 | #define EXT4_DEFM_JMODE_ORDERED 0x0040 |
| 708 | #define EXT4_DEFM_JMODE_WBACK 0x0060 |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 709 | |
| 710 | /* |
| 711 | * Structure of a directory entry |
| 712 | */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 713 | #define EXT4_NAME_LEN 255 |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 714 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 715 | struct ext4_dir_entry { |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 716 | __le32 inode; /* Inode number */ |
| 717 | __le16 rec_len; /* Directory entry length */ |
| 718 | __le16 name_len; /* Name length */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 719 | char name[EXT4_NAME_LEN]; /* File name */ |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 720 | }; |
| 721 | |
| 722 | /* |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 723 | * The new version of the directory entry. Since EXT4 structures are |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 724 | * stored in intel byte order, and the name_len field could never be |
| 725 | * bigger than 255 chars, it's safe to reclaim the extra byte for the |
| 726 | * file_type field. |
| 727 | */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 728 | struct ext4_dir_entry_2 { |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 729 | __le32 inode; /* Inode number */ |
| 730 | __le16 rec_len; /* Directory entry length */ |
| 731 | __u8 name_len; /* Name length */ |
| 732 | __u8 file_type; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 733 | char name[EXT4_NAME_LEN]; /* File name */ |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 734 | }; |
| 735 | |
| 736 | /* |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 737 | * Ext4 directory file types. Only the low 3 bits are used. The |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 738 | * other bits are reserved for now. |
| 739 | */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 740 | #define EXT4_FT_UNKNOWN 0 |
| 741 | #define EXT4_FT_REG_FILE 1 |
| 742 | #define EXT4_FT_DIR 2 |
| 743 | #define EXT4_FT_CHRDEV 3 |
| 744 | #define EXT4_FT_BLKDEV 4 |
| 745 | #define EXT4_FT_FIFO 5 |
| 746 | #define EXT4_FT_SOCK 6 |
| 747 | #define EXT4_FT_SYMLINK 7 |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 748 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 749 | #define EXT4_FT_MAX 8 |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 750 | |
| 751 | /* |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 752 | * EXT4_DIR_PAD defines the directory entries boundaries |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 753 | * |
| 754 | * NOTE: It must be a multiple of 4 |
| 755 | */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 756 | #define EXT4_DIR_PAD 4 |
| 757 | #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1) |
| 758 | #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \ |
| 759 | ~EXT4_DIR_ROUND) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 760 | /* |
| 761 | * Hash Tree Directory indexing |
| 762 | * (c) Daniel Phillips, 2001 |
| 763 | */ |
| 764 | |
Eric Sandeen | 4074fe3 | 2007-10-16 18:38:25 -0400 | [diff] [blame^] | 765 | #define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \ |
| 766 | EXT4_FEATURE_COMPAT_DIR_INDEX) && \ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 767 | (EXT4_I(dir)->i_flags & EXT4_INDEX_FL)) |
| 768 | #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX) |
| 769 | #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 770 | |
| 771 | /* Legal values for the dx_root hash_version field: */ |
| 772 | |
| 773 | #define DX_HASH_LEGACY 0 |
| 774 | #define DX_HASH_HALF_MD4 1 |
| 775 | #define DX_HASH_TEA 2 |
| 776 | |
| 777 | #ifdef __KERNEL__ |
| 778 | |
| 779 | /* hash info structure used by the directory hash */ |
| 780 | struct dx_hash_info |
| 781 | { |
| 782 | u32 hash; |
| 783 | u32 minor_hash; |
| 784 | int hash_version; |
| 785 | u32 *seed; |
| 786 | }; |
| 787 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 788 | #define EXT4_HTREE_EOF 0x7fffffff |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 789 | |
| 790 | /* |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 791 | * Control parameters used by ext4_htree_next_block |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 792 | */ |
| 793 | #define HASH_NB_ALWAYS 1 |
| 794 | |
| 795 | |
| 796 | /* |
| 797 | * Describe an inode's exact location on disk and in memory |
| 798 | */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 799 | struct ext4_iloc |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 800 | { |
| 801 | struct buffer_head *bh; |
| 802 | unsigned long offset; |
| 803 | unsigned long block_group; |
| 804 | }; |
| 805 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 806 | static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 807 | { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 808 | return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 809 | } |
| 810 | |
| 811 | /* |
| 812 | * This structure is stuffed into the struct file's private_data field |
| 813 | * for directories. It is where we put information so that we can do |
| 814 | * readdir operations in hash tree order. |
| 815 | */ |
| 816 | struct dir_private_info { |
| 817 | struct rb_root root; |
| 818 | struct rb_node *curr_node; |
| 819 | struct fname *extra_fname; |
| 820 | loff_t last_pos; |
| 821 | __u32 curr_hash; |
| 822 | __u32 curr_minor_hash; |
| 823 | __u32 next_hash; |
| 824 | }; |
| 825 | |
| 826 | /* calculate the first block number of the group */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 827 | static inline ext4_fsblk_t |
| 828 | ext4_group_first_block_no(struct super_block *sb, unsigned long group_no) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 829 | { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 830 | return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) + |
| 831 | le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 832 | } |
| 833 | |
| 834 | /* |
| 835 | * Special error return code only used by dx_probe() and its callers. |
| 836 | */ |
| 837 | #define ERR_BAD_DX_DIR -75000 |
| 838 | |
Andrew Morton | 72b64b5 | 2006-10-11 01:21:18 -0700 | [diff] [blame] | 839 | void ext4_get_group_no_and_offset(struct super_block *sb, ext4_fsblk_t blocknr, |
| 840 | unsigned long *blockgrpp, ext4_grpblk_t *offsetp); |
Mingming Cao | 3a5b2ec | 2006-10-11 01:21:05 -0700 | [diff] [blame] | 841 | |
| 842 | /* |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 843 | * Function prototypes |
| 844 | */ |
| 845 | |
| 846 | /* |
| 847 | * Ok, these declarations are also in <linux/kernel.h> but none of the |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 848 | * ext4 source programs needs to include it so they are duplicated here. |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 849 | */ |
Dave Kleikamp | 8c55e20 | 2007-05-24 13:04:54 -0400 | [diff] [blame] | 850 | # define NORET_TYPE /**/ |
| 851 | # define ATTRIB_NORET __attribute__((noreturn)) |
| 852 | # define NORET_AND noreturn, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 853 | |
| 854 | /* balloc.c */ |
Mingming Cao | 3a5b2ec | 2006-10-11 01:21:05 -0700 | [diff] [blame] | 855 | extern unsigned int ext4_block_group(struct super_block *sb, |
| 856 | ext4_fsblk_t blocknr); |
| 857 | extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb, |
| 858 | ext4_fsblk_t blocknr); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 859 | extern int ext4_bg_has_super(struct super_block *sb, int group); |
| 860 | extern unsigned long ext4_bg_num_gdb(struct super_block *sb, int group); |
| 861 | extern ext4_fsblk_t ext4_new_block (handle_t *handle, struct inode *inode, |
| 862 | ext4_fsblk_t goal, int *errp); |
| 863 | extern ext4_fsblk_t ext4_new_blocks (handle_t *handle, struct inode *inode, |
| 864 | ext4_fsblk_t goal, unsigned long *count, int *errp); |
| 865 | extern void ext4_free_blocks (handle_t *handle, struct inode *inode, |
| 866 | ext4_fsblk_t block, unsigned long count); |
| 867 | extern void ext4_free_blocks_sb (handle_t *handle, struct super_block *sb, |
| 868 | ext4_fsblk_t block, unsigned long count, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 869 | unsigned long *pdquot_freed_blocks); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 870 | extern ext4_fsblk_t ext4_count_free_blocks (struct super_block *); |
| 871 | extern void ext4_check_blocks_bitmap (struct super_block *); |
| 872 | extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 873 | unsigned int block_group, |
| 874 | struct buffer_head ** bh); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 875 | extern int ext4_should_retry_alloc(struct super_block *sb, int *retries); |
| 876 | extern void ext4_init_block_alloc_info(struct inode *); |
| 877 | extern void ext4_rsv_window_add(struct super_block *sb, struct ext4_reserve_window_node *rsv); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 878 | |
| 879 | /* dir.c */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 880 | extern int ext4_check_dir_entry(const char *, struct inode *, |
| 881 | struct ext4_dir_entry_2 *, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 882 | struct buffer_head *, unsigned long); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 883 | extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 884 | __u32 minor_hash, |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 885 | struct ext4_dir_entry_2 *dirent); |
| 886 | extern void ext4_htree_free_dir_info(struct dir_private_info *p); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 887 | |
| 888 | /* fsync.c */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 889 | extern int ext4_sync_file (struct file *, struct dentry *, int); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 890 | |
| 891 | /* hash.c */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 892 | extern int ext4fs_dirhash(const char *name, int len, struct |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 893 | dx_hash_info *hinfo); |
| 894 | |
| 895 | /* ialloc.c */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 896 | extern struct inode * ext4_new_inode (handle_t *, struct inode *, int); |
| 897 | extern void ext4_free_inode (handle_t *, struct inode *); |
| 898 | extern struct inode * ext4_orphan_get (struct super_block *, unsigned long); |
| 899 | extern unsigned long ext4_count_free_inodes (struct super_block *); |
| 900 | extern unsigned long ext4_count_dirs (struct super_block *); |
| 901 | extern void ext4_check_inodes_bitmap (struct super_block *); |
| 902 | extern unsigned long ext4_count_free (struct buffer_head *, unsigned); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 903 | |
| 904 | |
| 905 | /* inode.c */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 906 | int ext4_forget(handle_t *handle, int is_metadata, struct inode *inode, |
| 907 | struct buffer_head *bh, ext4_fsblk_t blocknr); |
| 908 | struct buffer_head * ext4_getblk (handle_t *, struct inode *, long, int, int *); |
| 909 | struct buffer_head * ext4_bread (handle_t *, struct inode *, int, int, int *); |
| 910 | int ext4_get_blocks_handle(handle_t *handle, struct inode *inode, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 911 | sector_t iblock, unsigned long maxblocks, struct buffer_head *bh_result, |
| 912 | int create, int extend_disksize); |
| 913 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 914 | extern void ext4_read_inode (struct inode *); |
| 915 | extern int ext4_write_inode (struct inode *, int); |
| 916 | extern int ext4_setattr (struct dentry *, struct iattr *); |
| 917 | extern void ext4_delete_inode (struct inode *); |
| 918 | extern int ext4_sync_inode (handle_t *, struct inode *); |
| 919 | extern void ext4_discard_reservation (struct inode *); |
| 920 | extern void ext4_dirty_inode(struct inode *); |
| 921 | extern int ext4_change_inode_journal_flag(struct inode *, int); |
| 922 | extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *); |
| 923 | extern void ext4_truncate (struct inode *); |
| 924 | extern void ext4_set_inode_flags(struct inode *); |
Jan Kara | ff9ddf7 | 2007-07-18 09:24:20 -0400 | [diff] [blame] | 925 | extern void ext4_get_inode_flags(struct ext4_inode_info *); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 926 | extern void ext4_set_aops(struct inode *inode); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 927 | extern int ext4_writepage_trans_blocks(struct inode *); |
| 928 | extern int ext4_block_truncate_page(handle_t *handle, struct page *page, |
| 929 | struct address_space *mapping, loff_t from); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 930 | |
| 931 | /* ioctl.c */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 932 | extern int ext4_ioctl (struct inode *, struct file *, unsigned int, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 933 | unsigned long); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 934 | extern long ext4_compat_ioctl (struct file *, unsigned int, unsigned long); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 935 | |
| 936 | /* namei.c */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 937 | extern int ext4_orphan_add(handle_t *, struct inode *); |
| 938 | extern int ext4_orphan_del(handle_t *, struct inode *); |
| 939 | extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 940 | __u32 start_minor_hash, __u32 *next_hash); |
| 941 | |
| 942 | /* resize.c */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 943 | extern int ext4_group_add(struct super_block *sb, |
| 944 | struct ext4_new_group_data *input); |
| 945 | extern int ext4_group_extend(struct super_block *sb, |
| 946 | struct ext4_super_block *es, |
| 947 | ext4_fsblk_t n_blocks_count); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 948 | |
| 949 | /* super.c */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 950 | extern void ext4_error (struct super_block *, const char *, const char *, ...) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 951 | __attribute__ ((format (printf, 3, 4))); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 952 | extern void __ext4_std_error (struct super_block *, const char *, int); |
| 953 | extern void ext4_abort (struct super_block *, const char *, const char *, ...) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 954 | __attribute__ ((format (printf, 3, 4))); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 955 | extern void ext4_warning (struct super_block *, const char *, const char *, ...) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 956 | __attribute__ ((format (printf, 3, 4))); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 957 | extern void ext4_update_dynamic_rev (struct super_block *sb); |
Alexandre Ratchov | 8fadc14 | 2006-10-11 01:21:15 -0700 | [diff] [blame] | 958 | extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb, |
| 959 | struct ext4_group_desc *bg); |
| 960 | extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb, |
| 961 | struct ext4_group_desc *bg); |
| 962 | extern ext4_fsblk_t ext4_inode_table(struct super_block *sb, |
| 963 | struct ext4_group_desc *bg); |
| 964 | extern void ext4_block_bitmap_set(struct super_block *sb, |
| 965 | struct ext4_group_desc *bg, ext4_fsblk_t blk); |
| 966 | extern void ext4_inode_bitmap_set(struct super_block *sb, |
| 967 | struct ext4_group_desc *bg, ext4_fsblk_t blk); |
| 968 | extern void ext4_inode_table_set(struct super_block *sb, |
| 969 | struct ext4_group_desc *bg, ext4_fsblk_t blk); |
Laurent Vivier | bd81d8e | 2006-10-11 01:21:10 -0700 | [diff] [blame] | 970 | |
| 971 | static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es) |
| 972 | { |
| 973 | return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) | |
| 974 | le32_to_cpu(es->s_blocks_count); |
| 975 | } |
| 976 | |
| 977 | static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es) |
| 978 | { |
| 979 | return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) | |
| 980 | le32_to_cpu(es->s_r_blocks_count); |
| 981 | } |
| 982 | |
| 983 | static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es) |
| 984 | { |
| 985 | return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) | |
| 986 | le32_to_cpu(es->s_free_blocks_count); |
| 987 | } |
| 988 | |
| 989 | static inline void ext4_blocks_count_set(struct ext4_super_block *es, |
| 990 | ext4_fsblk_t blk) |
| 991 | { |
| 992 | es->s_blocks_count = cpu_to_le32((u32)blk); |
| 993 | es->s_blocks_count_hi = cpu_to_le32(blk >> 32); |
| 994 | } |
| 995 | |
| 996 | static inline void ext4_free_blocks_count_set(struct ext4_super_block *es, |
| 997 | ext4_fsblk_t blk) |
| 998 | { |
| 999 | es->s_free_blocks_count = cpu_to_le32((u32)blk); |
| 1000 | es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32); |
| 1001 | } |
| 1002 | |
| 1003 | static inline void ext4_r_blocks_count_set(struct ext4_super_block *es, |
| 1004 | ext4_fsblk_t blk) |
| 1005 | { |
| 1006 | es->s_r_blocks_count = cpu_to_le32((u32)blk); |
| 1007 | es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32); |
| 1008 | } |
| 1009 | |
| 1010 | |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1011 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1012 | #define ext4_std_error(sb, errno) \ |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1013 | do { \ |
| 1014 | if ((errno)) \ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1015 | __ext4_std_error((sb), __FUNCTION__, (errno)); \ |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1016 | } while (0) |
| 1017 | |
| 1018 | /* |
| 1019 | * Inodes and files operations |
| 1020 | */ |
| 1021 | |
| 1022 | /* dir.c */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1023 | extern const struct file_operations ext4_dir_operations; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1024 | |
| 1025 | /* file.c */ |
Arjan van de Ven | c5ef1c4 | 2007-02-12 00:55:40 -0800 | [diff] [blame] | 1026 | extern const struct inode_operations ext4_file_inode_operations; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1027 | extern const struct file_operations ext4_file_operations; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1028 | |
| 1029 | /* namei.c */ |
Arjan van de Ven | c5ef1c4 | 2007-02-12 00:55:40 -0800 | [diff] [blame] | 1030 | extern const struct inode_operations ext4_dir_inode_operations; |
| 1031 | extern const struct inode_operations ext4_special_inode_operations; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1032 | |
| 1033 | /* symlink.c */ |
Arjan van de Ven | c5ef1c4 | 2007-02-12 00:55:40 -0800 | [diff] [blame] | 1034 | extern const struct inode_operations ext4_symlink_inode_operations; |
| 1035 | extern const struct inode_operations ext4_fast_symlink_inode_operations; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1036 | |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1037 | /* extents.c */ |
| 1038 | extern int ext4_ext_tree_init(handle_t *handle, struct inode *); |
| 1039 | extern int ext4_ext_writepage_trans_blocks(struct inode *, int); |
| 1040 | extern int ext4_ext_get_blocks(handle_t *handle, struct inode *inode, |
| 1041 | ext4_fsblk_t iblock, |
| 1042 | unsigned long max_blocks, struct buffer_head *bh_result, |
| 1043 | int create, int extend_disksize); |
| 1044 | extern void ext4_ext_truncate(struct inode *, struct page *); |
| 1045 | extern void ext4_ext_init(struct super_block *); |
| 1046 | extern void ext4_ext_release(struct super_block *); |
Amit Arora | a2df2a6 | 2007-07-17 21:42:41 -0400 | [diff] [blame] | 1047 | extern long ext4_fallocate(struct inode *inode, int mode, loff_t offset, |
| 1048 | loff_t len); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1049 | static inline int |
| 1050 | ext4_get_blocks_wrap(handle_t *handle, struct inode *inode, sector_t block, |
| 1051 | unsigned long max_blocks, struct buffer_head *bh, |
| 1052 | int create, int extend_disksize) |
| 1053 | { |
| 1054 | if (EXT4_I(inode)->i_flags & EXT4_EXTENTS_FL) |
| 1055 | return ext4_ext_get_blocks(handle, inode, block, max_blocks, |
| 1056 | bh, create, extend_disksize); |
| 1057 | return ext4_get_blocks_handle(handle, inode, block, max_blocks, bh, |
| 1058 | create, extend_disksize); |
| 1059 | } |
| 1060 | |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1061 | |
| 1062 | #endif /* __KERNEL__ */ |
| 1063 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1064 | #endif /* _LINUX_EXT4_FS_H */ |