Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1 | /* |
Christoph Hellwig | 3dcf545 | 2008-04-29 18:13:32 -0400 | [diff] [blame] | 2 | * ext4.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 | |
Christoph Hellwig | 3dcf545 | 2008-04-29 18:13:32 -0400 | [diff] [blame] | 16 | #ifndef _EXT4_H |
| 17 | #define _EXT4_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> |
Aneesh Kumar K.V | 2ccb5fb | 2009-01-05 21:49:55 -0500 | [diff] [blame] | 22 | #include <linux/jbd2.h> |
Mingming Cao | 60e58e0 | 2009-01-22 18:13:05 +0100 | [diff] [blame] | 23 | #include <linux/quota.h> |
Theodore Ts'o | d444c3c | 2009-05-01 13:44:33 -0400 | [diff] [blame] | 24 | #include <linux/rwsem.h> |
| 25 | #include <linux/rbtree.h> |
| 26 | #include <linux/seqlock.h> |
| 27 | #include <linux/mutex.h> |
Theodore Ts'o | ca0faba | 2009-05-03 16:33:44 -0400 | [diff] [blame] | 28 | #include <linux/timer.h> |
| 29 | #include <linux/wait.h> |
| 30 | #include <linux/blockgroup_lock.h> |
| 31 | #include <linux/percpu_counter.h> |
Darrick J. Wong | 0441984 | 2012-04-29 18:27:10 -0400 | [diff] [blame] | 32 | #include <crypto/hash.h> |
Ben Hutchings | 4d92dc0 | 2010-05-17 06:00:00 -0400 | [diff] [blame] | 33 | #ifdef __KERNEL__ |
| 34 | #include <linux/compat.h> |
| 35 | #endif |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 36 | |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 37 | /* |
Shen Feng | 8a35694 | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 38 | * The fourth extended filesystem constants/structures |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 39 | */ |
| 40 | |
| 41 | /* |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 42 | * Define EXT4FS_DEBUG to produce debug messages |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 43 | */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 44 | #undef EXT4FS_DEBUG |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 45 | |
| 46 | /* |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 47 | * Debug code |
| 48 | */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 49 | #ifdef EXT4FS_DEBUG |
| 50 | #define ext4_debug(f, a...) \ |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 51 | do { \ |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 52 | printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \ |
Stoyan Gaydarov | 4db9c54 | 2008-07-13 21:03:29 -0400 | [diff] [blame] | 53 | __FILE__, __LINE__, __func__); \ |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 54 | printk(KERN_DEBUG f, ## a); \ |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 55 | } while (0) |
| 56 | #else |
Joe Perches | ace36ad | 2012-03-19 23:11:43 -0400 | [diff] [blame] | 57 | #define ext4_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 58 | #endif |
| 59 | |
Theodore Ts'o | 4a092d7 | 2012-11-28 13:03:30 -0500 | [diff] [blame] | 60 | /* |
| 61 | * Turn on EXT_DEBUG to get lots of info about extents operations. |
| 62 | */ |
| 63 | #define EXT_DEBUG__ |
| 64 | #ifdef EXT_DEBUG |
| 65 | #define ext_debug(fmt, ...) printk(fmt, ##__VA_ARGS__) |
| 66 | #else |
| 67 | #define ext_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__) |
| 68 | #endif |
| 69 | |
Frank Mayhar | 273df55 | 2010-03-02 11:46:09 -0500 | [diff] [blame] | 70 | #define EXT4_ERROR_INODE(inode, fmt, a...) \ |
Theodore Ts'o | c398eda | 2010-07-27 11:56:40 -0400 | [diff] [blame] | 71 | ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a) |
| 72 | |
| 73 | #define EXT4_ERROR_INODE_BLOCK(inode, block, fmt, a...) \ |
| 74 | ext4_error_inode((inode), __func__, __LINE__, (block), (fmt), ## a) |
Frank Mayhar | 273df55 | 2010-03-02 11:46:09 -0500 | [diff] [blame] | 75 | |
Theodore Ts'o | f7c2117 | 2011-01-10 12:10:55 -0500 | [diff] [blame] | 76 | #define EXT4_ERROR_FILE(file, block, fmt, a...) \ |
| 77 | ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a) |
Frank Mayhar | 273df55 | 2010-03-02 11:46:09 -0500 | [diff] [blame] | 78 | |
Theodore Ts'o | d444c3c | 2009-05-01 13:44:33 -0400 | [diff] [blame] | 79 | /* data type for block offset of block group */ |
| 80 | typedef int ext4_grpblk_t; |
| 81 | |
| 82 | /* data type for filesystem-wide blocks number */ |
| 83 | typedef unsigned long long ext4_fsblk_t; |
| 84 | |
| 85 | /* data type for file logical block number */ |
| 86 | typedef __u32 ext4_lblk_t; |
| 87 | |
| 88 | /* data type for block group number */ |
| 89 | typedef unsigned int ext4_group_t; |
| 90 | |
Theodore Ts'o | 296c355 | 2009-09-30 00:32:42 -0400 | [diff] [blame] | 91 | /* |
Theodore Ts'o | 60e6679 | 2010-05-17 07:00:00 -0400 | [diff] [blame] | 92 | * Flags used in mballoc's allocation_context flags field. |
Theodore Ts'o | 296c355 | 2009-09-30 00:32:42 -0400 | [diff] [blame] | 93 | * |
| 94 | * Also used to show what's going on for debugging purposes when the |
| 95 | * flag field is exported via the traceport interface |
| 96 | */ |
Theodore Ts'o | d444c3c | 2009-05-01 13:44:33 -0400 | [diff] [blame] | 97 | |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 98 | /* prefer goal again. length */ |
Theodore Ts'o | 0ef90db | 2009-08-09 16:46:13 -0400 | [diff] [blame] | 99 | #define EXT4_MB_HINT_MERGE 0x0001 |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 100 | /* blocks already reserved */ |
Theodore Ts'o | 0ef90db | 2009-08-09 16:46:13 -0400 | [diff] [blame] | 101 | #define EXT4_MB_HINT_RESERVED 0x0002 |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 102 | /* metadata is being allocated */ |
Theodore Ts'o | 0ef90db | 2009-08-09 16:46:13 -0400 | [diff] [blame] | 103 | #define EXT4_MB_HINT_METADATA 0x0004 |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 104 | /* first blocks in the file */ |
Theodore Ts'o | 0ef90db | 2009-08-09 16:46:13 -0400 | [diff] [blame] | 105 | #define EXT4_MB_HINT_FIRST 0x0008 |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 106 | /* search for the best chunk */ |
Theodore Ts'o | 0ef90db | 2009-08-09 16:46:13 -0400 | [diff] [blame] | 107 | #define EXT4_MB_HINT_BEST 0x0010 |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 108 | /* data is being allocated */ |
Theodore Ts'o | 0ef90db | 2009-08-09 16:46:13 -0400 | [diff] [blame] | 109 | #define EXT4_MB_HINT_DATA 0x0020 |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 110 | /* don't preallocate (for tails) */ |
Theodore Ts'o | 0ef90db | 2009-08-09 16:46:13 -0400 | [diff] [blame] | 111 | #define EXT4_MB_HINT_NOPREALLOC 0x0040 |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 112 | /* allocate for locality group */ |
Theodore Ts'o | 0ef90db | 2009-08-09 16:46:13 -0400 | [diff] [blame] | 113 | #define EXT4_MB_HINT_GROUP_ALLOC 0x0080 |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 114 | /* allocate goal blocks or none */ |
Theodore Ts'o | 0ef90db | 2009-08-09 16:46:13 -0400 | [diff] [blame] | 115 | #define EXT4_MB_HINT_GOAL_ONLY 0x0100 |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 116 | /* goal is meaningful */ |
Theodore Ts'o | 0ef90db | 2009-08-09 16:46:13 -0400 | [diff] [blame] | 117 | #define EXT4_MB_HINT_TRY_GOAL 0x0200 |
Mingming Cao | d2a1763 | 2008-07-14 17:52:37 -0400 | [diff] [blame] | 118 | /* blocks already pre-reserved by delayed allocation */ |
Theodore Ts'o | 0ef90db | 2009-08-09 16:46:13 -0400 | [diff] [blame] | 119 | #define EXT4_MB_DELALLOC_RESERVED 0x0400 |
Theodore Ts'o | 4ba74d0 | 2009-08-09 22:01:13 -0400 | [diff] [blame] | 120 | /* We are doing stream allocation */ |
| 121 | #define EXT4_MB_STREAM_ALLOC 0x0800 |
Allison Henderson | 55f020d | 2011-05-25 07:41:26 -0400 | [diff] [blame] | 122 | /* Use reserved root blocks if needed */ |
| 123 | #define EXT4_MB_USE_ROOT_BLOCKS 0x1000 |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 124 | |
| 125 | struct ext4_allocation_request { |
| 126 | /* target inode for block we're allocating */ |
| 127 | struct inode *inode; |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 128 | /* how many blocks we want to allocate */ |
Theodore Ts'o | 498e5f2 | 2008-11-05 00:14:04 -0500 | [diff] [blame] | 129 | unsigned int len; |
Eric Sandeen | 726447d | 2009-07-13 10:24:17 -0400 | [diff] [blame] | 130 | /* logical block in target inode */ |
| 131 | ext4_lblk_t logical; |
| 132 | /* the closest logical allocated block to the left */ |
| 133 | ext4_lblk_t lleft; |
| 134 | /* the closest logical allocated block to the right */ |
| 135 | ext4_lblk_t lright; |
| 136 | /* phys. target (a hint) */ |
| 137 | ext4_fsblk_t goal; |
| 138 | /* phys. block for the closest logical allocated block to the left */ |
| 139 | ext4_fsblk_t pleft; |
| 140 | /* phys. block for the closest logical allocated block to the right */ |
| 141 | ext4_fsblk_t pright; |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 142 | /* flags. see above EXT4_MB_HINT_* */ |
Theodore Ts'o | 498e5f2 | 2008-11-05 00:14:04 -0500 | [diff] [blame] | 143 | unsigned int flags; |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 144 | }; |
| 145 | |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 146 | /* |
Theodore Ts'o | e35fd66 | 2010-05-16 19:00:00 -0400 | [diff] [blame] | 147 | * Logical to physical block mapping, used by ext4_map_blocks() |
| 148 | * |
| 149 | * This structure is used to pass requests into ext4_map_blocks() as |
| 150 | * well as to store the information returned by ext4_map_blocks(). It |
| 151 | * takes less room on the stack than a struct buffer_head. |
| 152 | */ |
| 153 | #define EXT4_MAP_NEW (1 << BH_New) |
| 154 | #define EXT4_MAP_MAPPED (1 << BH_Mapped) |
| 155 | #define EXT4_MAP_UNWRITTEN (1 << BH_Unwritten) |
| 156 | #define EXT4_MAP_BOUNDARY (1 << BH_Boundary) |
| 157 | #define EXT4_MAP_UNINIT (1 << BH_Uninit) |
Aditya Kali | 7b415bf | 2011-09-09 19:04:51 -0400 | [diff] [blame] | 158 | /* Sometimes (in the bigalloc case, from ext4_da_get_block_prep) the caller of |
| 159 | * ext4_map_blocks wants to know whether or not the underlying cluster has |
| 160 | * already been accounted for. EXT4_MAP_FROM_CLUSTER conveys to the caller that |
| 161 | * the requested mapping was from previously mapped (or delayed allocated) |
| 162 | * cluster. We use BH_AllocFromCluster only for this flag. BH_AllocFromCluster |
| 163 | * should never appear on buffer_head's state flags. |
| 164 | */ |
| 165 | #define EXT4_MAP_FROM_CLUSTER (1 << BH_AllocFromCluster) |
Theodore Ts'o | e35fd66 | 2010-05-16 19:00:00 -0400 | [diff] [blame] | 166 | #define EXT4_MAP_FLAGS (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\ |
| 167 | EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY |\ |
Aditya Kali | 7b415bf | 2011-09-09 19:04:51 -0400 | [diff] [blame] | 168 | EXT4_MAP_UNINIT | EXT4_MAP_FROM_CLUSTER) |
Theodore Ts'o | e35fd66 | 2010-05-16 19:00:00 -0400 | [diff] [blame] | 169 | |
| 170 | struct ext4_map_blocks { |
| 171 | ext4_fsblk_t m_pblk; |
| 172 | ext4_lblk_t m_lblk; |
| 173 | unsigned int m_len; |
| 174 | unsigned int m_flags; |
| 175 | }; |
| 176 | |
| 177 | /* |
Theodore Ts'o | b3a3ca8 | 2009-08-31 23:13:11 -0400 | [diff] [blame] | 178 | * For delayed allocation tracking |
| 179 | */ |
| 180 | struct mpage_da_data { |
| 181 | struct inode *inode; |
| 182 | sector_t b_blocknr; /* start block number of extent */ |
| 183 | size_t b_size; /* size of extent */ |
| 184 | unsigned long b_state; /* state of the extent */ |
| 185 | unsigned long first_page, next_page; /* extent of pages */ |
| 186 | struct writeback_control *wbc; |
| 187 | int io_done; |
| 188 | int pages_written; |
| 189 | int retval; |
| 190 | }; |
Theodore Ts'o | bd2d021 | 2010-10-27 21:30:10 -0400 | [diff] [blame] | 191 | |
| 192 | /* |
| 193 | * Flags for ext4_io_end->flags |
| 194 | */ |
| 195 | #define EXT4_IO_END_UNWRITTEN 0x0001 |
| 196 | #define EXT4_IO_END_ERROR 0x0002 |
Jan Kara | 84c1754 | 2013-01-28 09:43:46 -0500 | [diff] [blame] | 197 | #define EXT4_IO_END_DIRECT 0x0004 |
Theodore Ts'o | bd2d021 | 2010-10-27 21:30:10 -0400 | [diff] [blame] | 198 | |
| 199 | struct ext4_io_page { |
| 200 | struct page *p_page; |
Theodore Ts'o | 83668e7 | 2010-11-08 13:45:33 -0500 | [diff] [blame] | 201 | atomic_t p_count; |
Theodore Ts'o | bd2d021 | 2010-10-27 21:30:10 -0400 | [diff] [blame] | 202 | }; |
| 203 | |
| 204 | #define MAX_IO_PAGES 128 |
| 205 | |
Curt Wohlgemuth | 4188188 | 2012-03-05 10:40:22 -0500 | [diff] [blame] | 206 | /* |
| 207 | * For converting uninitialized extents on a work queue. |
| 208 | * |
| 209 | * 'page' is only used from the writepage() path; 'pages' is only used for |
| 210 | * buffered writes; they are used to keep page references until conversion |
| 211 | * takes place. For AIO/DIO, neither field is filled in. |
| 212 | */ |
Mingming Cao | 0031462 | 2009-09-28 15:49:08 -0400 | [diff] [blame] | 213 | typedef struct ext4_io_end { |
jiayingz@google.com (Jiaying Zhang) | 5b3ff23 | 2010-07-27 11:56:06 -0400 | [diff] [blame] | 214 | struct list_head list; /* per-file finished IO list */ |
Mingming Cao | 0031462 | 2009-09-28 15:49:08 -0400 | [diff] [blame] | 215 | struct inode *inode; /* file being written to */ |
Mingming Cao | 8d5d02e | 2009-09-28 15:48:29 -0400 | [diff] [blame] | 216 | unsigned int flag; /* unwritten or not */ |
Eric Sandeen | a1de02d | 2010-02-04 23:58:38 -0500 | [diff] [blame] | 217 | loff_t offset; /* offset in the file */ |
| 218 | ssize_t size; /* size of the extent */ |
jiayingz@google.com (Jiaying Zhang) | 5b3ff23 | 2010-07-27 11:56:06 -0400 | [diff] [blame] | 219 | struct kiocb *iocb; /* iocb struct for AIO */ |
| 220 | int result; /* error value for AIO */ |
Curt Wohlgemuth | 4188188 | 2012-03-05 10:40:22 -0500 | [diff] [blame] | 221 | int num_io_pages; /* for writepages() */ |
| 222 | struct ext4_io_page *pages[MAX_IO_PAGES]; /* for writepages() */ |
Mingming Cao | 0031462 | 2009-09-28 15:49:08 -0400 | [diff] [blame] | 223 | } ext4_io_end_t; |
| 224 | |
Theodore Ts'o | bd2d021 | 2010-10-27 21:30:10 -0400 | [diff] [blame] | 225 | struct ext4_io_submit { |
| 226 | int io_op; |
| 227 | struct bio *io_bio; |
| 228 | ext4_io_end_t *io_end; |
| 229 | struct ext4_io_page *io_page; |
| 230 | sector_t io_next_block; |
| 231 | }; |
| 232 | |
Theodore Ts'o | b3a3ca8 | 2009-08-31 23:13:11 -0400 | [diff] [blame] | 233 | /* |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 234 | * Special inodes numbers |
| 235 | */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 236 | #define EXT4_BAD_INO 1 /* Bad blocks inode */ |
| 237 | #define EXT4_ROOT_INO 2 /* Root inode */ |
Aditya Kali | ae81230 | 2011-05-24 19:00:39 -0400 | [diff] [blame] | 238 | #define EXT4_USR_QUOTA_INO 3 /* User quota inode */ |
| 239 | #define EXT4_GRP_QUOTA_INO 4 /* Group quota inode */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 240 | #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */ |
| 241 | #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */ |
| 242 | #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */ |
| 243 | #define EXT4_JOURNAL_INO 8 /* Journal inode */ |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 244 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 245 | /* First non-reserved inode for old ext4 filesystems */ |
| 246 | #define EXT4_GOOD_OLD_FIRST_INO 11 |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 247 | |
| 248 | /* |
| 249 | * Maximal count of links to a file |
| 250 | */ |
Andreas Dilger | f8628a1 | 2007-07-18 08:38:01 -0400 | [diff] [blame] | 251 | #define EXT4_LINK_MAX 65000 |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 252 | |
| 253 | /* |
| 254 | * Macro-instructions used to manage several block sizes |
| 255 | */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 256 | #define EXT4_MIN_BLOCK_SIZE 1024 |
Takashi Sato | afc7cbc | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 257 | #define EXT4_MAX_BLOCK_SIZE 65536 |
| 258 | #define EXT4_MIN_BLOCK_LOG_SIZE 10 |
Curt Wohlgemuth | fb1813f | 2010-10-27 21:29:12 -0400 | [diff] [blame] | 259 | #define EXT4_MAX_BLOCK_LOG_SIZE 16 |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 260 | #ifdef __KERNEL__ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 261 | # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 262 | #else |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 263 | # 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] | 264 | #endif |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 265 | #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32)) |
Theodore Ts'o | 281b599 | 2011-09-09 18:34:51 -0400 | [diff] [blame] | 266 | #define EXT4_CLUSTER_SIZE(s) (EXT4_BLOCK_SIZE(s) << \ |
| 267 | EXT4_SB(s)->s_cluster_bits) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 268 | #ifdef __KERNEL__ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 269 | # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits) |
Theodore Ts'o | 281b599 | 2011-09-09 18:34:51 -0400 | [diff] [blame] | 270 | # define EXT4_CLUSTER_BITS(s) (EXT4_SB(s)->s_cluster_bits) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 271 | #else |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 272 | # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 273 | #endif |
| 274 | #ifdef __KERNEL__ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 275 | #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits) |
| 276 | #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size) |
| 277 | #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 278 | #else |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 279 | #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ |
| 280 | EXT4_GOOD_OLD_INODE_SIZE : \ |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 281 | (s)->s_inode_size) |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 282 | #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ |
| 283 | EXT4_GOOD_OLD_FIRST_INO : \ |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 284 | (s)->s_first_ino) |
| 285 | #endif |
Amit Arora | a2df2a6 | 2007-07-17 21:42:41 -0400 | [diff] [blame] | 286 | #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits))) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 287 | |
Theodore Ts'o | d5b8f31 | 2011-09-09 18:44:51 -0400 | [diff] [blame] | 288 | /* Translate a block number to a cluster number */ |
| 289 | #define EXT4_B2C(sbi, blk) ((blk) >> (sbi)->s_cluster_bits) |
| 290 | /* Translate a cluster number to a block number */ |
| 291 | #define EXT4_C2B(sbi, cluster) ((cluster) << (sbi)->s_cluster_bits) |
| 292 | /* Translate # of blks to # of clusters */ |
| 293 | #define EXT4_NUM_B2C(sbi, blks) (((blks) + (sbi)->s_cluster_ratio - 1) >> \ |
| 294 | (sbi)->s_cluster_bits) |
| 295 | |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 296 | /* |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 297 | * Structure of a blocks group descriptor |
| 298 | */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 299 | struct ext4_group_desc |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 300 | { |
Aneesh Kumar K.V | 3a14589 | 2007-10-16 18:38:25 -0400 | [diff] [blame] | 301 | __le32 bg_block_bitmap_lo; /* Blocks bitmap block */ |
Aneesh Kumar K.V | 5272f83 | 2007-10-16 18:38:25 -0400 | [diff] [blame] | 302 | __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */ |
| 303 | __le32 bg_inode_table_lo; /* Inodes table block */ |
Aneesh Kumar K.V | 560671a | 2009-01-05 22:20:24 -0500 | [diff] [blame] | 304 | __le16 bg_free_blocks_count_lo;/* Free blocks count */ |
| 305 | __le16 bg_free_inodes_count_lo;/* Free inodes count */ |
| 306 | __le16 bg_used_dirs_count_lo; /* Directories count */ |
Andreas Dilger | 717d50e | 2007-10-16 18:38:25 -0400 | [diff] [blame] | 307 | __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */ |
Darrick J. Wong | e615391 | 2012-04-29 18:23:10 -0400 | [diff] [blame] | 308 | __le32 bg_exclude_bitmap_lo; /* Exclude bitmap for snapshots */ |
| 309 | __le16 bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bbitmap) LE */ |
| 310 | __le16 bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+ibitmap) LE */ |
Aneesh Kumar K.V | 560671a | 2009-01-05 22:20:24 -0500 | [diff] [blame] | 311 | __le16 bg_itable_unused_lo; /* Unused inodes count */ |
Andreas Dilger | 717d50e | 2007-10-16 18:38:25 -0400 | [diff] [blame] | 312 | __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */ |
Alexandre Ratchov | 8fadc14 | 2006-10-11 01:21:15 -0700 | [diff] [blame] | 313 | __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */ |
| 314 | __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */ |
| 315 | __le32 bg_inode_table_hi; /* Inodes table block MSB */ |
Coly Li | 91b51a0 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 316 | __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */ |
| 317 | __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */ |
| 318 | __le16 bg_used_dirs_count_hi; /* Directories count MSB */ |
Aneesh Kumar K.V | 560671a | 2009-01-05 22:20:24 -0500 | [diff] [blame] | 319 | __le16 bg_itable_unused_hi; /* Unused inodes count MSB */ |
Darrick J. Wong | e615391 | 2012-04-29 18:23:10 -0400 | [diff] [blame] | 320 | __le32 bg_exclude_bitmap_hi; /* Exclude bitmap block MSB */ |
| 321 | __le16 bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bbitmap) BE */ |
| 322 | __le16 bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+ibitmap) BE */ |
| 323 | __u32 bg_reserved; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 324 | }; |
| 325 | |
Darrick J. Wong | 41a246d | 2012-04-29 18:33:10 -0400 | [diff] [blame] | 326 | #define EXT4_BG_INODE_BITMAP_CSUM_HI_END \ |
| 327 | (offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \ |
| 328 | sizeof(__le16)) |
| 329 | #define EXT4_BG_BLOCK_BITMAP_CSUM_HI_END \ |
| 330 | (offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \ |
| 331 | sizeof(__le16)) |
| 332 | |
Jose R. Santos | 772cb7c | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 333 | /* |
| 334 | * Structure of a flex block group info |
| 335 | */ |
| 336 | |
| 337 | struct flex_groups { |
Theodore Ts'o | 9f24e42 | 2009-03-04 19:09:10 -0500 | [diff] [blame] | 338 | atomic_t free_inodes; |
Theodore Ts'o | 24aaa8e | 2011-09-09 18:58:51 -0400 | [diff] [blame] | 339 | atomic_t free_clusters; |
Theodore Ts'o | 7d39db1 | 2009-03-04 19:31:53 -0500 | [diff] [blame] | 340 | atomic_t used_dirs; |
Jose R. Santos | 772cb7c | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 341 | }; |
| 342 | |
Andreas Dilger | 717d50e | 2007-10-16 18:38:25 -0400 | [diff] [blame] | 343 | #define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */ |
| 344 | #define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */ |
| 345 | #define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */ |
| 346 | |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 347 | /* |
| 348 | * Macro-instructions used to manage group descriptors |
| 349 | */ |
Alexandre Ratchov | 0d1ee42 | 2006-10-11 01:21:14 -0700 | [diff] [blame] | 350 | #define EXT4_MIN_DESC_SIZE 32 |
Alexandre Ratchov | 8fadc14 | 2006-10-11 01:21:15 -0700 | [diff] [blame] | 351 | #define EXT4_MIN_DESC_SIZE_64BIT 64 |
Alexandre Ratchov | 0d1ee42 | 2006-10-11 01:21:14 -0700 | [diff] [blame] | 352 | #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE |
| 353 | #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 354 | #ifdef __KERNEL__ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 355 | # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group) |
Theodore Ts'o | 281b599 | 2011-09-09 18:34:51 -0400 | [diff] [blame] | 356 | # define EXT4_CLUSTERS_PER_GROUP(s) (EXT4_SB(s)->s_clusters_per_group) |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 357 | # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block) |
| 358 | # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group) |
| 359 | # 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] | 360 | #else |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 361 | # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group) |
Alexandre Ratchov | 0d1ee42 | 2006-10-11 01:21:14 -0700 | [diff] [blame] | 362 | # 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] | 363 | # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 364 | #endif |
| 365 | |
| 366 | /* |
| 367 | * Constants relative to the data blocks |
| 368 | */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 369 | #define EXT4_NDIR_BLOCKS 12 |
| 370 | #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS |
| 371 | #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1) |
| 372 | #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1) |
| 373 | #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 374 | |
| 375 | /* |
| 376 | * Inode flags |
| 377 | */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 378 | #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */ |
| 379 | #define EXT4_UNRM_FL 0x00000002 /* Undelete */ |
| 380 | #define EXT4_COMPR_FL 0x00000004 /* Compress file */ |
| 381 | #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */ |
| 382 | #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */ |
| 383 | #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */ |
| 384 | #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */ |
| 385 | #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */ |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 386 | /* Reserved for compression usage... */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 387 | #define EXT4_DIRTY_FL 0x00000100 |
| 388 | #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ |
| 389 | #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */ |
| 390 | #define EXT4_ECOMPR_FL 0x00000800 /* Compression error */ |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 391 | /* End compression flags --- maybe not all used */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 392 | #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */ |
| 393 | #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */ |
| 394 | #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */ |
| 395 | #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */ |
| 396 | #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */ |
| 397 | #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/ |
Aneesh Kumar K.V | 8180a56 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 398 | #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */ |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 399 | #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */ |
Theodore Ts'o | f710b4b | 2010-01-25 03:31:32 -0500 | [diff] [blame] | 400 | #define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */ |
Jiaying Zhang | c8d46e4 | 2010-02-24 09:52:53 -0500 | [diff] [blame] | 401 | #define EXT4_EOFBLOCKS_FL 0x00400000 /* Blocks allocated beyond EOF */ |
Tao Ma | 67cf5b0 | 2012-12-10 14:04:46 -0500 | [diff] [blame] | 402 | #define EXT4_INLINE_DATA_FL 0x10000000 /* Inode has inline data. */ |
Aneesh Kumar K.V | 8180a56 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 403 | #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */ |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 404 | |
Jiaying Zhang | c8d46e4 | 2010-02-24 09:52:53 -0500 | [diff] [blame] | 405 | #define EXT4_FL_USER_VISIBLE 0x004BDFFF /* User visible flags */ |
| 406 | #define EXT4_FL_USER_MODIFIABLE 0x004B80FF /* User modifiable flags */ |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 407 | |
Duane Griffin | 8fa43a8 | 2009-02-15 18:57:26 -0500 | [diff] [blame] | 408 | /* Flags that should be inherited by new inodes from their parent. */ |
| 409 | #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\ |
Theodore Ts'o | 1cd9f09 | 2011-08-31 11:54:51 -0400 | [diff] [blame] | 410 | EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\ |
Duane Griffin | 8fa43a8 | 2009-02-15 18:57:26 -0500 | [diff] [blame] | 411 | EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\ |
| 412 | EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL) |
| 413 | |
Duane Griffin | 2dc6b0d | 2009-02-15 18:09:20 -0500 | [diff] [blame] | 414 | /* Flags that are appropriate for regular files (all but dir-specific ones). */ |
| 415 | #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL)) |
| 416 | |
| 417 | /* Flags that are appropriate for non-directories/regular files. */ |
| 418 | #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL) |
| 419 | |
| 420 | /* Mask out flags that are inappropriate for the given type of inode. */ |
| 421 | static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags) |
| 422 | { |
| 423 | if (S_ISDIR(mode)) |
| 424 | return flags; |
| 425 | else if (S_ISREG(mode)) |
| 426 | return flags & EXT4_REG_FLMASK; |
| 427 | else |
| 428 | return flags & EXT4_OTHER_FLMASK; |
| 429 | } |
| 430 | |
Dmitry Monakhov | 12e9b89 | 2010-05-16 22:00:00 -0400 | [diff] [blame] | 431 | /* |
| 432 | * Inode flags used for atomic set/get |
| 433 | */ |
| 434 | enum { |
| 435 | EXT4_INODE_SECRM = 0, /* Secure deletion */ |
| 436 | EXT4_INODE_UNRM = 1, /* Undelete */ |
| 437 | EXT4_INODE_COMPR = 2, /* Compress file */ |
| 438 | EXT4_INODE_SYNC = 3, /* Synchronous updates */ |
| 439 | EXT4_INODE_IMMUTABLE = 4, /* Immutable file */ |
| 440 | EXT4_INODE_APPEND = 5, /* writes to file may only append */ |
| 441 | EXT4_INODE_NODUMP = 6, /* do not dump file */ |
| 442 | EXT4_INODE_NOATIME = 7, /* do not update atime */ |
| 443 | /* Reserved for compression usage... */ |
| 444 | EXT4_INODE_DIRTY = 8, |
| 445 | EXT4_INODE_COMPRBLK = 9, /* One or more compressed clusters */ |
| 446 | EXT4_INODE_NOCOMPR = 10, /* Don't compress */ |
| 447 | EXT4_INODE_ECOMPR = 11, /* Compression error */ |
| 448 | /* End compression flags --- maybe not all used */ |
| 449 | EXT4_INODE_INDEX = 12, /* hash-indexed directory */ |
| 450 | EXT4_INODE_IMAGIC = 13, /* AFS directory */ |
| 451 | EXT4_INODE_JOURNAL_DATA = 14, /* file data should be journaled */ |
| 452 | EXT4_INODE_NOTAIL = 15, /* file tail should not be merged */ |
| 453 | EXT4_INODE_DIRSYNC = 16, /* dirsync behaviour (directories only) */ |
| 454 | EXT4_INODE_TOPDIR = 17, /* Top of directory hierarchies*/ |
| 455 | EXT4_INODE_HUGE_FILE = 18, /* Set to each huge file */ |
| 456 | EXT4_INODE_EXTENTS = 19, /* Inode uses extents */ |
| 457 | EXT4_INODE_EA_INODE = 21, /* Inode used for large EA */ |
| 458 | EXT4_INODE_EOFBLOCKS = 22, /* Blocks allocated beyond EOF */ |
Tao Ma | 67cf5b0 | 2012-12-10 14:04:46 -0500 | [diff] [blame] | 459 | EXT4_INODE_INLINE_DATA = 28, /* Data in inode. */ |
Dmitry Monakhov | 12e9b89 | 2010-05-16 22:00:00 -0400 | [diff] [blame] | 460 | EXT4_INODE_RESERVED = 31, /* reserved for ext4 lib */ |
| 461 | }; |
| 462 | |
Dmitry Monakhov | 12e9b89 | 2010-05-16 22:00:00 -0400 | [diff] [blame] | 463 | /* |
Carlos Maiolino | 9a4c801 | 2012-12-10 16:30:45 -0500 | [diff] [blame] | 464 | * Since it's pretty easy to mix up bit numbers and hex values, we use a |
| 465 | * build-time check to make sure that EXT4_XXX_FL is consistent with respect to |
| 466 | * EXT4_INODE_XXX. If all is well, the macros will be dropped, so, it won't cost |
| 467 | * any extra space in the compiled kernel image, otherwise, the build will fail. |
| 468 | * It's important that these values are the same, since we are using |
| 469 | * EXT4_INODE_XXX to test for flag values, but EXT4_XXX_FL must be consistent |
| 470 | * with the values of FS_XXX_FL defined in include/linux/fs.h and the on-disk |
| 471 | * values found in ext2, ext3 and ext4 filesystems, and of course the values |
| 472 | * defined in e2fsprogs. |
Dmitry Monakhov | 12e9b89 | 2010-05-16 22:00:00 -0400 | [diff] [blame] | 473 | * |
| 474 | * It's not paranoia if the Murphy's Law really *is* out to get you. :-) |
| 475 | */ |
Carlos Maiolino | 9a4c801 | 2012-12-10 16:30:45 -0500 | [diff] [blame] | 476 | #define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG)) |
| 477 | #define CHECK_FLAG_VALUE(FLAG) BUILD_BUG_ON(!TEST_FLAG_VALUE(FLAG)) |
| 478 | |
Dmitry Monakhov | 12e9b89 | 2010-05-16 22:00:00 -0400 | [diff] [blame] | 479 | static inline void ext4_check_flag_values(void) |
| 480 | { |
| 481 | CHECK_FLAG_VALUE(SECRM); |
| 482 | CHECK_FLAG_VALUE(UNRM); |
| 483 | CHECK_FLAG_VALUE(COMPR); |
| 484 | CHECK_FLAG_VALUE(SYNC); |
| 485 | CHECK_FLAG_VALUE(IMMUTABLE); |
| 486 | CHECK_FLAG_VALUE(APPEND); |
| 487 | CHECK_FLAG_VALUE(NODUMP); |
| 488 | CHECK_FLAG_VALUE(NOATIME); |
| 489 | CHECK_FLAG_VALUE(DIRTY); |
| 490 | CHECK_FLAG_VALUE(COMPRBLK); |
| 491 | CHECK_FLAG_VALUE(NOCOMPR); |
| 492 | CHECK_FLAG_VALUE(ECOMPR); |
| 493 | CHECK_FLAG_VALUE(INDEX); |
| 494 | CHECK_FLAG_VALUE(IMAGIC); |
| 495 | CHECK_FLAG_VALUE(JOURNAL_DATA); |
| 496 | CHECK_FLAG_VALUE(NOTAIL); |
| 497 | CHECK_FLAG_VALUE(DIRSYNC); |
| 498 | CHECK_FLAG_VALUE(TOPDIR); |
| 499 | CHECK_FLAG_VALUE(HUGE_FILE); |
| 500 | CHECK_FLAG_VALUE(EXTENTS); |
| 501 | CHECK_FLAG_VALUE(EA_INODE); |
| 502 | CHECK_FLAG_VALUE(EOFBLOCKS); |
Tao Ma | 67cf5b0 | 2012-12-10 14:04:46 -0500 | [diff] [blame] | 503 | CHECK_FLAG_VALUE(INLINE_DATA); |
Dmitry Monakhov | 12e9b89 | 2010-05-16 22:00:00 -0400 | [diff] [blame] | 504 | CHECK_FLAG_VALUE(RESERVED); |
| 505 | } |
| 506 | |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 507 | /* Used to pass group descriptor data when online resize is done */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 508 | struct ext4_new_group_input { |
Dave Kleikamp | 8c55e20 | 2007-05-24 13:04:54 -0400 | [diff] [blame] | 509 | __u32 group; /* Group number for this data */ |
| 510 | __u64 block_bitmap; /* Absolute block number of block bitmap */ |
| 511 | __u64 inode_bitmap; /* Absolute block number of inode bitmap */ |
| 512 | __u64 inode_table; /* Absolute block number of inode table start */ |
| 513 | __u32 blocks_count; /* Total number of blocks in this group */ |
| 514 | __u16 reserved_blocks; /* Number of reserved blocks in this group */ |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 515 | __u16 unused; |
| 516 | }; |
| 517 | |
Ben Hutchings | 4d92dc0 | 2010-05-17 06:00:00 -0400 | [diff] [blame] | 518 | #if defined(__KERNEL__) && defined(CONFIG_COMPAT) |
| 519 | struct compat_ext4_new_group_input { |
| 520 | u32 group; |
| 521 | compat_u64 block_bitmap; |
| 522 | compat_u64 inode_bitmap; |
| 523 | compat_u64 inode_table; |
| 524 | u32 blocks_count; |
| 525 | u16 reserved_blocks; |
| 526 | u16 unused; |
| 527 | }; |
| 528 | #endif |
| 529 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 530 | /* The struct ext4_new_group_input in kernel space, with free_blocks_count */ |
| 531 | struct ext4_new_group_data { |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 532 | __u32 group; |
Laurent Vivier | bd81d8e | 2006-10-11 01:21:10 -0700 | [diff] [blame] | 533 | __u64 block_bitmap; |
| 534 | __u64 inode_bitmap; |
| 535 | __u64 inode_table; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 536 | __u32 blocks_count; |
| 537 | __u16 reserved_blocks; |
| 538 | __u16 unused; |
| 539 | __u32 free_blocks_count; |
| 540 | }; |
| 541 | |
Yongqiang Yang | 33afdcc | 2012-01-03 23:32:52 -0500 | [diff] [blame] | 542 | /* Indexes used to index group tables in ext4_new_group_data */ |
| 543 | enum { |
| 544 | BLOCK_BITMAP = 0, /* block bitmap */ |
| 545 | INODE_BITMAP, /* inode bitmap */ |
| 546 | INODE_TABLE, /* inode tables */ |
| 547 | GROUP_TABLE_COUNT, |
| 548 | }; |
| 549 | |
Amit Arora | a2df2a6 | 2007-07-17 21:42:41 -0400 | [diff] [blame] | 550 | /* |
Eric Sandeen | 79e8303 | 2010-07-27 11:56:07 -0400 | [diff] [blame] | 551 | * Flags used by ext4_map_blocks() |
Amit Arora | a2df2a6 | 2007-07-17 21:42:41 -0400 | [diff] [blame] | 552 | */ |
Theodore Ts'o | c217705 | 2009-05-14 00:58:52 -0400 | [diff] [blame] | 553 | /* Allocate any needed blocks and/or convert an unitialized |
| 554 | extent to be an initialized ext4 */ |
Theodore Ts'o | 2ac3b6e | 2009-05-14 13:57:08 -0400 | [diff] [blame] | 555 | #define EXT4_GET_BLOCKS_CREATE 0x0001 |
Theodore Ts'o | c217705 | 2009-05-14 00:58:52 -0400 | [diff] [blame] | 556 | /* Request the creation of an unitialized extent */ |
Theodore Ts'o | 2ac3b6e | 2009-05-14 13:57:08 -0400 | [diff] [blame] | 557 | #define EXT4_GET_BLOCKS_UNINIT_EXT 0x0002 |
Theodore Ts'o | c217705 | 2009-05-14 00:58:52 -0400 | [diff] [blame] | 558 | #define EXT4_GET_BLOCKS_CREATE_UNINIT_EXT (EXT4_GET_BLOCKS_UNINIT_EXT|\ |
| 559 | EXT4_GET_BLOCKS_CREATE) |
Theodore Ts'o | c217705 | 2009-05-14 00:58:52 -0400 | [diff] [blame] | 560 | /* Caller is from the delayed allocation writeout path, |
Theodore Ts'o | 60e6679 | 2010-05-17 07:00:00 -0400 | [diff] [blame] | 561 | so set the magic i_delalloc_reserve_flag after taking the |
Theodore Ts'o | 2ac3b6e | 2009-05-14 13:57:08 -0400 | [diff] [blame] | 562 | inode allocation semaphore for */ |
Jan Kara | 03f5d8b | 2009-06-09 00:17:05 -0400 | [diff] [blame] | 563 | #define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004 |
Mingming Cao | 0031462 | 2009-09-28 15:49:08 -0400 | [diff] [blame] | 564 | /* caller is from the direct IO path, request to creation of an |
| 565 | unitialized extents if not allocated, split the uninitialized |
| 566 | extent if blocks has been preallocated already*/ |
Jiaying Zhang | c7064ef | 2010-03-02 13:28:44 -0500 | [diff] [blame] | 567 | #define EXT4_GET_BLOCKS_PRE_IO 0x0008 |
Aneesh Kumar K.V | 1296cc8 | 2010-01-15 01:27:59 -0500 | [diff] [blame] | 568 | #define EXT4_GET_BLOCKS_CONVERT 0x0010 |
Jiaying Zhang | c7064ef | 2010-03-02 13:28:44 -0500 | [diff] [blame] | 569 | #define EXT4_GET_BLOCKS_IO_CREATE_EXT (EXT4_GET_BLOCKS_PRE_IO|\ |
Mingming Cao | 0031462 | 2009-09-28 15:49:08 -0400 | [diff] [blame] | 570 | EXT4_GET_BLOCKS_CREATE_UNINIT_EXT) |
Jiaying Zhang | c7064ef | 2010-03-02 13:28:44 -0500 | [diff] [blame] | 571 | /* Convert extent to initialized after IO complete */ |
| 572 | #define EXT4_GET_BLOCKS_IO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT|\ |
Jiaying Zhang | 744692d | 2010-03-04 16:14:02 -0500 | [diff] [blame] | 573 | EXT4_GET_BLOCKS_CREATE_UNINIT_EXT) |
Allison Henderson | 55f020d | 2011-05-25 07:41:26 -0400 | [diff] [blame] | 574 | /* Punch out blocks of an extent */ |
| 575 | #define EXT4_GET_BLOCKS_PUNCH_OUT_EXT 0x0020 |
Vivek Haldar | 556b27a | 2011-05-25 07:41:54 -0400 | [diff] [blame] | 576 | /* Don't normalize allocation size (used for fallocate) */ |
| 577 | #define EXT4_GET_BLOCKS_NO_NORMALIZE 0x0040 |
Dmitry Monakhov | a4e5d88 | 2011-10-25 08:15:12 -0400 | [diff] [blame] | 578 | /* Request will not result in inode size update (user for fallocate) */ |
| 579 | #define EXT4_GET_BLOCKS_KEEP_SIZE 0x0080 |
Zheng Liu | 729f52c | 2012-07-09 16:29:29 -0400 | [diff] [blame] | 580 | /* Do not take i_data_sem locking in ext4_map_blocks */ |
| 581 | #define EXT4_GET_BLOCKS_NO_LOCK 0x0100 |
Zheng Liu | d100eef | 2013-02-18 00:29:59 -0500 | [diff] [blame] | 582 | /* Do not put hole in extent cache */ |
| 583 | #define EXT4_GET_BLOCKS_NO_PUT_HOLE 0x0200 |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 584 | |
| 585 | /* |
Theodore Ts'o | e636260 | 2009-11-23 07:17:05 -0500 | [diff] [blame] | 586 | * Flags used by ext4_free_blocks |
| 587 | */ |
| 588 | #define EXT4_FREE_BLOCKS_METADATA 0x0001 |
| 589 | #define EXT4_FREE_BLOCKS_FORGET 0x0002 |
Theodore Ts'o | 1f2acb6 | 2010-01-22 17:40:42 -0500 | [diff] [blame] | 590 | #define EXT4_FREE_BLOCKS_VALIDATED 0x0004 |
Maxim Patlasov | 7132de7 | 2011-07-10 19:37:48 -0400 | [diff] [blame] | 591 | #define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE 0x0008 |
Theodore Ts'o | 8413019 | 2011-09-09 18:50:51 -0400 | [diff] [blame] | 592 | #define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER 0x0010 |
| 593 | #define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER 0x0020 |
Theodore Ts'o | e636260 | 2009-11-23 07:17:05 -0500 | [diff] [blame] | 594 | |
| 595 | /* |
Allison Henderson | 4e96b2d | 2011-09-03 11:51:09 -0400 | [diff] [blame] | 596 | * Flags used by ext4_discard_partial_page_buffers |
| 597 | */ |
| 598 | #define EXT4_DISCARD_PARTIAL_PG_ZERO_UNMAPPED 0x0001 |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 599 | |
| 600 | /* |
| 601 | * ioctl commands |
| 602 | */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 603 | #define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS |
| 604 | #define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS |
| 605 | #define EXT4_IOC_GETVERSION _IOR('f', 3, long) |
| 606 | #define EXT4_IOC_SETVERSION _IOW('f', 4, long) |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 607 | #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION |
| 608 | #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 609 | #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long) |
| 610 | #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long) |
Theodore Ts'o | 8eea80d | 2008-09-13 19:54:35 -0400 | [diff] [blame] | 611 | #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long) |
| 612 | #define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input) |
| 613 | #define EXT4_IOC_MIGRATE _IO('f', 9) |
Theodore Ts'o | ccd2506 | 2009-02-26 01:04:07 -0500 | [diff] [blame] | 614 | /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */ |
Theodore Ts'o | 8eea80d | 2008-09-13 19:54:35 -0400 | [diff] [blame] | 615 | /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */ |
Theodore Ts'o | ccd2506 | 2009-02-26 01:04:07 -0500 | [diff] [blame] | 616 | #define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12) |
Akira Fujita | 748de67 | 2009-06-17 19:24:03 -0400 | [diff] [blame] | 617 | #define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent) |
Yongqiang Yang | 19c5246 | 2012-01-04 17:09:44 -0500 | [diff] [blame] | 618 | #define EXT4_IOC_RESIZE_FS _IOW('f', 16, __u64) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 619 | |
Ben Hutchings | 899ad0c | 2010-05-17 05:00:00 -0400 | [diff] [blame] | 620 | #if defined(__KERNEL__) && defined(CONFIG_COMPAT) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 621 | /* |
| 622 | * ioctl commands in 32 bit emulation |
| 623 | */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 624 | #define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS |
| 625 | #define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS |
| 626 | #define EXT4_IOC32_GETVERSION _IOR('f', 3, int) |
| 627 | #define EXT4_IOC32_SETVERSION _IOW('f', 4, int) |
| 628 | #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int) |
| 629 | #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int) |
| 630 | #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int) |
Ben Hutchings | 4d92dc0 | 2010-05-17 06:00:00 -0400 | [diff] [blame] | 631 | #define EXT4_IOC32_GROUP_ADD _IOW('f', 8, struct compat_ext4_new_group_input) |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 632 | #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION |
| 633 | #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION |
Ben Hutchings | 899ad0c | 2010-05-17 05:00:00 -0400 | [diff] [blame] | 634 | #endif |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 635 | |
Uwe Kleine-König | b595076 | 2010-11-01 15:38:34 -0400 | [diff] [blame] | 636 | /* Max physical block we can address w/o extents */ |
Eric Sandeen | fb0a387 | 2009-09-16 14:45:10 -0400 | [diff] [blame] | 637 | #define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF |
| 638 | |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 639 | /* |
| 640 | * Structure of an inode on the disk |
| 641 | */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 642 | struct ext4_inode { |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 643 | __le16 i_mode; /* File mode */ |
| 644 | __le16 i_uid; /* Low 16 bits of Owner Uid */ |
Aneesh Kumar K.V | a48380f | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 645 | __le32 i_size_lo; /* Size in bytes */ |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 646 | __le32 i_atime; /* Access time */ |
Kalpak Shah | ef7f383 | 2007-07-18 09:15:20 -0400 | [diff] [blame] | 647 | __le32 i_ctime; /* Inode Change time */ |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 648 | __le32 i_mtime; /* Modification time */ |
| 649 | __le32 i_dtime; /* Deletion Time */ |
| 650 | __le16 i_gid; /* Low 16 bits of Group Id */ |
| 651 | __le16 i_links_count; /* Links count */ |
Aneesh Kumar K.V | 0fc1b45 | 2008-01-28 23:58:26 -0500 | [diff] [blame] | 652 | __le32 i_blocks_lo; /* Blocks count */ |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 653 | __le32 i_flags; /* File flags */ |
| 654 | union { |
| 655 | struct { |
Jean Noel Cordenner | 25ec56b | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 656 | __le32 l_i_version; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 657 | } linux1; |
| 658 | struct { |
| 659 | __u32 h_i_translator; |
| 660 | } hurd1; |
| 661 | struct { |
| 662 | __u32 m_i_reserved1; |
| 663 | } masix1; |
| 664 | } osd1; /* OS dependent 1 */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 665 | __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */ |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 666 | __le32 i_generation; /* File version (for NFS) */ |
Aneesh Kumar K.V | 7973c0c | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 667 | __le32 i_file_acl_lo; /* File ACL */ |
Aneesh Kumar K.V | a48380f | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 668 | __le32 i_size_high; |
Coly Li | f077d0d | 2007-10-16 18:38:25 -0400 | [diff] [blame] | 669 | __le32 i_obso_faddr; /* Obsoleted fragment address */ |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 670 | union { |
| 671 | struct { |
Aneesh Kumar K.V | 0fc1b45 | 2008-01-28 23:58:26 -0500 | [diff] [blame] | 672 | __le16 l_i_blocks_high; /* were l_i_reserved1 */ |
Badari Pulavarty | a1ddeb7 | 2006-10-11 01:21:09 -0700 | [diff] [blame] | 673 | __le16 l_i_file_acl_high; |
Dave Kleikamp | 8c55e20 | 2007-05-24 13:04:54 -0400 | [diff] [blame] | 674 | __le16 l_i_uid_high; /* these 2 fields */ |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 675 | __le16 l_i_gid_high; /* were reserved2[0] */ |
Darrick J. Wong | e615391 | 2012-04-29 18:23:10 -0400 | [diff] [blame] | 676 | __le16 l_i_checksum_lo;/* crc32c(uuid+inum+inode) LE */ |
| 677 | __le16 l_i_reserved; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 678 | } linux2; |
| 679 | struct { |
Coly Li | f077d0d | 2007-10-16 18:38:25 -0400 | [diff] [blame] | 680 | __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] | 681 | __u16 h_i_mode_high; |
| 682 | __u16 h_i_uid_high; |
| 683 | __u16 h_i_gid_high; |
| 684 | __u32 h_i_author; |
| 685 | } hurd2; |
| 686 | struct { |
Coly Li | f077d0d | 2007-10-16 18:38:25 -0400 | [diff] [blame] | 687 | __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] | 688 | __le16 m_i_file_acl_high; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 689 | __u32 m_i_reserved2[2]; |
| 690 | } masix2; |
| 691 | } osd2; /* OS dependent 2 */ |
| 692 | __le16 i_extra_isize; |
Darrick J. Wong | e615391 | 2012-04-29 18:23:10 -0400 | [diff] [blame] | 693 | __le16 i_checksum_hi; /* crc32c(uuid+inum+inode) BE */ |
Kalpak Shah | ef7f383 | 2007-07-18 09:15:20 -0400 | [diff] [blame] | 694 | __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */ |
| 695 | __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */ |
| 696 | __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */ |
| 697 | __le32 i_crtime; /* File Creation time */ |
| 698 | __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */ |
Jean Noel Cordenner | 25ec56b | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 699 | __le32 i_version_hi; /* high 32 bits for 64-bit version */ |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 700 | }; |
| 701 | |
Akira Fujita | 748de67 | 2009-06-17 19:24:03 -0400 | [diff] [blame] | 702 | struct move_extent { |
| 703 | __u32 reserved; /* should be zero */ |
| 704 | __u32 donor_fd; /* donor file descriptor */ |
| 705 | __u64 orig_start; /* logical start offset in block for orig */ |
| 706 | __u64 donor_start; /* logical start offset in block for donor */ |
| 707 | __u64 len; /* block length to be moved */ |
| 708 | __u64 moved_len; /* moved block length */ |
| 709 | }; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 710 | |
Kalpak Shah | ef7f383 | 2007-07-18 09:15:20 -0400 | [diff] [blame] | 711 | #define EXT4_EPOCH_BITS 2 |
| 712 | #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1) |
| 713 | #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS) |
| 714 | |
| 715 | /* |
| 716 | * Extended fields will fit into an inode if the filesystem was formatted |
| 717 | * with large inodes (-I 256 or larger) and there are not currently any EAs |
| 718 | * consuming all of the available space. For new inodes we always reserve |
| 719 | * enough space for the kernel's known extended fields, but for inodes |
| 720 | * created with an old kernel this might not have been the case. None of |
| 721 | * the extended inode fields is critical for correct filesystem operation. |
| 722 | * This macro checks if a certain field fits in the inode. Note that |
| 723 | * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize |
| 724 | */ |
| 725 | #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \ |
| 726 | ((offsetof(typeof(*ext4_inode), field) + \ |
| 727 | sizeof((ext4_inode)->field)) \ |
| 728 | <= (EXT4_GOOD_OLD_INODE_SIZE + \ |
| 729 | (einode)->i_extra_isize)) \ |
| 730 | |
| 731 | static inline __le32 ext4_encode_extra_time(struct timespec *time) |
| 732 | { |
| 733 | return cpu_to_le32((sizeof(time->tv_sec) > 4 ? |
Theodore Ts'o | c1fccc0 | 2009-09-30 01:13:55 -0400 | [diff] [blame] | 734 | (time->tv_sec >> 32) & EXT4_EPOCH_MASK : 0) | |
| 735 | ((time->tv_nsec << EXT4_EPOCH_BITS) & EXT4_NSEC_MASK)); |
Kalpak Shah | ef7f383 | 2007-07-18 09:15:20 -0400 | [diff] [blame] | 736 | } |
| 737 | |
| 738 | static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra) |
| 739 | { |
| 740 | if (sizeof(time->tv_sec) > 4) |
| 741 | time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) |
| 742 | << 32; |
Theodore Ts'o | c1fccc0 | 2009-09-30 01:13:55 -0400 | [diff] [blame] | 743 | time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS; |
Kalpak Shah | ef7f383 | 2007-07-18 09:15:20 -0400 | [diff] [blame] | 744 | } |
| 745 | |
| 746 | #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \ |
| 747 | do { \ |
| 748 | (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \ |
| 749 | if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \ |
| 750 | (raw_inode)->xtime ## _extra = \ |
| 751 | ext4_encode_extra_time(&(inode)->xtime); \ |
| 752 | } while (0) |
| 753 | |
| 754 | #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \ |
| 755 | do { \ |
| 756 | if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ |
| 757 | (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \ |
| 758 | if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ |
| 759 | (raw_inode)->xtime ## _extra = \ |
| 760 | ext4_encode_extra_time(&(einode)->xtime); \ |
| 761 | } while (0) |
| 762 | |
| 763 | #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \ |
| 764 | do { \ |
| 765 | (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \ |
| 766 | if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \ |
| 767 | ext4_decode_extra_time(&(inode)->xtime, \ |
| 768 | raw_inode->xtime ## _extra); \ |
Eric Sandeen | af0b44a | 2010-12-19 22:10:31 -0500 | [diff] [blame] | 769 | else \ |
| 770 | (inode)->xtime.tv_nsec = 0; \ |
Kalpak Shah | ef7f383 | 2007-07-18 09:15:20 -0400 | [diff] [blame] | 771 | } while (0) |
| 772 | |
| 773 | #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \ |
| 774 | do { \ |
| 775 | if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ |
| 776 | (einode)->xtime.tv_sec = \ |
| 777 | (signed)le32_to_cpu((raw_inode)->xtime); \ |
| 778 | if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ |
| 779 | ext4_decode_extra_time(&(einode)->xtime, \ |
| 780 | raw_inode->xtime ## _extra); \ |
Eric Sandeen | af0b44a | 2010-12-19 22:10:31 -0500 | [diff] [blame] | 781 | else \ |
| 782 | (einode)->xtime.tv_nsec = 0; \ |
Kalpak Shah | ef7f383 | 2007-07-18 09:15:20 -0400 | [diff] [blame] | 783 | } while (0) |
| 784 | |
Jean Noel Cordenner | 25ec56b | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 785 | #define i_disk_version osd1.linux1.l_i_version |
| 786 | |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 787 | #if defined(__KERNEL__) || defined(__linux__) |
| 788 | #define i_reserved1 osd1.linux1.l_i_reserved1 |
Badari Pulavarty | a1ddeb7 | 2006-10-11 01:21:09 -0700 | [diff] [blame] | 789 | #define i_file_acl_high osd2.linux2.l_i_file_acl_high |
Aneesh Kumar K.V | 0fc1b45 | 2008-01-28 23:58:26 -0500 | [diff] [blame] | 790 | #define i_blocks_high osd2.linux2.l_i_blocks_high |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 791 | #define i_uid_low i_uid |
| 792 | #define i_gid_low i_gid |
| 793 | #define i_uid_high osd2.linux2.l_i_uid_high |
| 794 | #define i_gid_high osd2.linux2.l_i_gid_high |
Darrick J. Wong | e615391 | 2012-04-29 18:23:10 -0400 | [diff] [blame] | 795 | #define i_checksum_lo osd2.linux2.l_i_checksum_lo |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 796 | |
| 797 | #elif defined(__GNU__) |
| 798 | |
| 799 | #define i_translator osd1.hurd1.h_i_translator |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 800 | #define i_uid_high osd2.hurd2.h_i_uid_high |
| 801 | #define i_gid_high osd2.hurd2.h_i_gid_high |
| 802 | #define i_author osd2.hurd2.h_i_author |
| 803 | |
| 804 | #elif defined(__masix__) |
| 805 | |
| 806 | #define i_reserved1 osd1.masix1.m_i_reserved1 |
Badari Pulavarty | a1ddeb7 | 2006-10-11 01:21:09 -0700 | [diff] [blame] | 807 | #define i_file_acl_high osd2.masix2.m_i_file_acl_high |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 808 | #define i_reserved2 osd2.masix2.m_i_reserved2 |
| 809 | |
| 810 | #endif /* defined(__KERNEL__) || defined(__linux__) */ |
| 811 | |
Zheng Liu | c0677e6 | 2012-11-08 15:18:54 -0500 | [diff] [blame] | 812 | #include "extents_status.h" |
| 813 | |
Theodore Ts'o | d444c3c | 2009-05-01 13:44:33 -0400 | [diff] [blame] | 814 | /* |
| 815 | * fourth extended file system inode data in memory |
| 816 | */ |
| 817 | struct ext4_inode_info { |
| 818 | __le32 i_data[15]; /* unconverted */ |
Theodore Ts'o | d444c3c | 2009-05-01 13:44:33 -0400 | [diff] [blame] | 819 | __u32 i_dtime; |
Dmitry Monakhov | 12e9b89 | 2010-05-16 22:00:00 -0400 | [diff] [blame] | 820 | ext4_fsblk_t i_file_acl; |
Theodore Ts'o | d444c3c | 2009-05-01 13:44:33 -0400 | [diff] [blame] | 821 | |
| 822 | /* |
| 823 | * i_block_group is the number of the block group which contains |
| 824 | * this file's inode. Constant across the lifetime of the inode, |
| 825 | * it is ued for making block allocation decisions - we try to |
| 826 | * place a file's data blocks near its inode block, and new inodes |
| 827 | * near to their parent directory's inode. |
| 828 | */ |
| 829 | ext4_group_t i_block_group; |
Theodore Ts'o | 8a2005d | 2011-01-10 12:13:42 -0500 | [diff] [blame] | 830 | ext4_lblk_t i_dir_start_lookup; |
Theodore Ts'o | 353eb83 | 2011-01-10 12:18:25 -0500 | [diff] [blame] | 831 | #if (BITS_PER_LONG < 64) |
Theodore Ts'o | 19f5fb7 | 2010-01-24 14:34:07 -0500 | [diff] [blame] | 832 | unsigned long i_state_flags; /* Dynamic state flags */ |
Theodore Ts'o | 353eb83 | 2011-01-10 12:18:25 -0500 | [diff] [blame] | 833 | #endif |
Dmitry Monakhov | 12e9b89 | 2010-05-16 22:00:00 -0400 | [diff] [blame] | 834 | unsigned long i_flags; |
Theodore Ts'o | d444c3c | 2009-05-01 13:44:33 -0400 | [diff] [blame] | 835 | |
Theodore Ts'o | d444c3c | 2009-05-01 13:44:33 -0400 | [diff] [blame] | 836 | /* |
| 837 | * Extended attributes can be read independently of the main file |
| 838 | * data. Taking i_mutex even when reading would cause contention |
| 839 | * between readers of EAs and writers of regular file data, so |
| 840 | * instead we synchronize on xattr_sem when reading or changing |
| 841 | * EAs. |
| 842 | */ |
| 843 | struct rw_semaphore xattr_sem; |
Theodore Ts'o | d444c3c | 2009-05-01 13:44:33 -0400 | [diff] [blame] | 844 | |
| 845 | struct list_head i_orphan; /* unlinked but open inodes */ |
| 846 | |
| 847 | /* |
| 848 | * i_disksize keeps track of what the inode size is ON DISK, not |
| 849 | * in memory. During truncate, i_size is set to the new size by |
| 850 | * the VFS prior to calling ext4_truncate(), but the filesystem won't |
| 851 | * set i_disksize to 0 until the truncate is actually under way. |
| 852 | * |
| 853 | * The intent is that i_disksize always represents the blocks which |
| 854 | * are used by this file. This allows recovery to restart truncate |
| 855 | * on orphans if we crash during truncate. We actually write i_disksize |
| 856 | * into the on-disk inode when writing inodes out, instead of i_size. |
| 857 | * |
| 858 | * The only time when i_disksize and i_size may be different is when |
| 859 | * a truncate is in progress. The only things which change i_disksize |
| 860 | * are ext4_get_block (growth) and ext4_truncate (shrinkth). |
| 861 | */ |
| 862 | loff_t i_disksize; |
| 863 | |
| 864 | /* |
| 865 | * i_data_sem is for serialising ext4_truncate() against |
| 866 | * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's |
| 867 | * data tree are chopped off during truncate. We can't do that in |
| 868 | * ext4 because whenever we perform intermediate commits during |
| 869 | * truncate, the inode and all the metadata blocks *must* be in a |
| 870 | * consistent state which allows truncation of the orphans to restart |
| 871 | * during recovery. Hence we must fix the get_block-vs-truncate race |
| 872 | * by other means, so we have i_data_sem. |
| 873 | */ |
| 874 | struct rw_semaphore i_data_sem; |
| 875 | struct inode vfs_inode; |
Theodore Ts'o | 8aefcd5 | 2011-01-10 12:29:43 -0500 | [diff] [blame] | 876 | struct jbd2_inode *jinode; |
Theodore Ts'o | d444c3c | 2009-05-01 13:44:33 -0400 | [diff] [blame] | 877 | |
Theodore Ts'o | d444c3c | 2009-05-01 13:44:33 -0400 | [diff] [blame] | 878 | /* |
| 879 | * File creation time. Its function is same as that of |
| 880 | * struct timespec i_{a,c,m}time in the generic inode. |
| 881 | */ |
| 882 | struct timespec i_crtime; |
| 883 | |
| 884 | /* mballoc */ |
| 885 | struct list_head i_prealloc_list; |
| 886 | spinlock_t i_prealloc_lock; |
| 887 | |
Zheng Liu | c0677e6 | 2012-11-08 15:18:54 -0500 | [diff] [blame] | 888 | /* extents status tree */ |
| 889 | struct ext4_es_tree i_es_tree; |
| 890 | rwlock_t i_es_lock; |
Zheng Liu | 74cd15c | 2013-02-18 00:32:55 -0500 | [diff] [blame] | 891 | struct list_head i_es_lru; |
| 892 | unsigned int i_es_lru_nr; /* protected by i_es_lock */ |
Zheng Liu | c0677e6 | 2012-11-08 15:18:54 -0500 | [diff] [blame] | 893 | |
Theodore Ts'o | d444c3c | 2009-05-01 13:44:33 -0400 | [diff] [blame] | 894 | /* ialloc */ |
| 895 | ext4_group_t i_last_alloc_group; |
| 896 | |
| 897 | /* allocation reservation info for delalloc */ |
Theodore Ts'o | 5704265 | 2011-09-09 18:56:51 -0400 | [diff] [blame] | 898 | /* In case of bigalloc, these refer to clusters rather than blocks */ |
Theodore Ts'o | d444c3c | 2009-05-01 13:44:33 -0400 | [diff] [blame] | 899 | unsigned int i_reserved_data_blocks; |
| 900 | unsigned int i_reserved_meta_blocks; |
| 901 | unsigned int i_allocated_meta_blocks; |
Theodore Ts'o | 01f49d0 | 2011-01-10 12:13:03 -0500 | [diff] [blame] | 902 | ext4_lblk_t i_da_metadata_calc_last_lblock; |
Theodore Ts'o | 9d0be50 | 2010-01-01 02:41:30 -0500 | [diff] [blame] | 903 | int i_da_metadata_calc_len; |
Theodore Ts'o | d444c3c | 2009-05-01 13:44:33 -0400 | [diff] [blame] | 904 | |
| 905 | /* on-disk additional length */ |
| 906 | __u16 i_extra_isize; |
| 907 | |
Tao Ma | 67cf5b0 | 2012-12-10 14:04:46 -0500 | [diff] [blame] | 908 | /* Indicate the inline data space. */ |
| 909 | u16 i_inline_off; |
| 910 | u16 i_inline_size; |
| 911 | |
Dmitry Monakhov | a9e7f44 | 2009-12-14 15:21:14 +0300 | [diff] [blame] | 912 | #ifdef CONFIG_QUOTA |
| 913 | /* quota space reservation, managed internally by quota code */ |
| 914 | qsize_t i_reserved_quota; |
| 915 | #endif |
Mingming Cao | 8d5d02e | 2009-09-28 15:48:29 -0400 | [diff] [blame] | 916 | |
Jiaying Zhang | c7064ef | 2010-03-02 13:28:44 -0500 | [diff] [blame] | 917 | /* completed IOs that might need unwritten extents handling */ |
| 918 | struct list_head i_completed_io_list; |
Jiaying Zhang | 744692d | 2010-03-04 16:14:02 -0500 | [diff] [blame] | 919 | spinlock_t i_completed_io_lock; |
Theodore Ts'o | 8a2005d | 2011-01-10 12:13:42 -0500 | [diff] [blame] | 920 | atomic_t i_ioend_count; /* Number of outstanding io_end structs */ |
Dmitry Monakhov | e27f41e | 2012-09-28 23:24:52 -0400 | [diff] [blame] | 921 | atomic_t i_unwritten; /* Nr. of inflight conversions pending */ |
Jan Kara | 84c1754 | 2013-01-28 09:43:46 -0500 | [diff] [blame] | 922 | struct work_struct i_unwritten_work; /* deferred extent conversion */ |
Theodore Ts'o | 8a2005d | 2011-01-10 12:13:42 -0500 | [diff] [blame] | 923 | |
| 924 | spinlock_t i_block_reservation_lock; |
Jan Kara | b436b9b | 2009-12-08 23:51:10 -0500 | [diff] [blame] | 925 | |
| 926 | /* |
| 927 | * Transactions that contain inode's metadata needed to complete |
| 928 | * fsync and fdatasync, respectively. |
| 929 | */ |
| 930 | tid_t i_sync_tid; |
| 931 | tid_t i_datasync_tid; |
Darrick J. Wong | 814525f | 2012-04-29 18:31:10 -0400 | [diff] [blame] | 932 | |
| 933 | /* Precomputed uuid+inum+igen checksum for seeding inode checksums */ |
| 934 | __u32 i_csum_seed; |
Theodore Ts'o | d444c3c | 2009-05-01 13:44:33 -0400 | [diff] [blame] | 935 | }; |
| 936 | |
| 937 | /* |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 938 | * File system states |
| 939 | */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 940 | #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */ |
| 941 | #define EXT4_ERROR_FS 0x0002 /* Errors detected */ |
| 942 | #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */ |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 943 | |
| 944 | /* |
Theodore Tso | 469108f | 2008-02-10 01:11:44 -0500 | [diff] [blame] | 945 | * Misc. filesystem flags |
| 946 | */ |
| 947 | #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */ |
| 948 | #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */ |
| 949 | #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */ |
| 950 | |
| 951 | /* |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 952 | * Mount flags |
| 953 | */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 954 | #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */ |
| 955 | #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */ |
| 956 | #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */ |
| 957 | #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */ |
| 958 | #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */ |
Theodore Ts'o | 39ef17f | 2012-03-03 17:56:23 -0500 | [diff] [blame] | 959 | #define EXT4_MOUNT_ERRORS_MASK 0x00070 |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 960 | #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */ |
| 961 | #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 962 | #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */ |
| 963 | #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */ |
| 964 | #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */ |
| 965 | #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */ |
| 966 | #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */ |
| 967 | #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */ |
| 968 | #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */ |
| 969 | #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */ |
Theodore Ts'o | afd4672 | 2009-03-16 23:12:23 -0400 | [diff] [blame] | 970 | #define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 971 | #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 972 | #define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */ |
| 973 | #define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */ |
| 974 | #define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */ |
Jiaying Zhang | 744692d | 2010-03-04 16:14:02 -0500 | [diff] [blame] | 975 | #define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000 /* Enable support for dio read nolocking */ |
Linus Torvalds | d4da6c9 | 2009-11-02 10:15:27 -0800 | [diff] [blame] | 976 | #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */ |
Girish Shilamkar | 818d276 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 977 | #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */ |
Alex Tomas | 6476924 | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 978 | #define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */ |
Hidehiro Kawai | 5bf5683 | 2008-10-10 22:12:43 -0400 | [diff] [blame] | 979 | #define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */ |
Theodore Ts'o | 6fd058f | 2009-05-17 15:38:01 -0400 | [diff] [blame] | 980 | #define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */ |
Eric Sandeen | 5328e63 | 2009-11-19 14:25:42 -0500 | [diff] [blame] | 981 | #define EXT4_MOUNT_DISCARD 0x40000000 /* Issue DISCARD requests */ |
Lukas Czerner | bfff687 | 2010-10-27 21:30:05 -0400 | [diff] [blame] | 982 | #define EXT4_MOUNT_INIT_INODE_TABLE 0x80000000 /* Initialize uninitialized itables */ |
Hidehiro Kawai | 5bf5683 | 2008-10-10 22:12:43 -0400 | [diff] [blame] | 983 | |
Theodore Ts'o | 5688978 | 2011-09-03 18:22:38 -0400 | [diff] [blame] | 984 | #define EXT4_MOUNT2_EXPLICIT_DELALLOC 0x00000001 /* User explicitly |
| 985 | specified delalloc */ |
| 986 | |
Theodore Ts'o | fd8c37e | 2010-12-15 20:26:48 -0500 | [diff] [blame] | 987 | #define clear_opt(sb, opt) EXT4_SB(sb)->s_mount_opt &= \ |
| 988 | ~EXT4_MOUNT_##opt |
| 989 | #define set_opt(sb, opt) EXT4_SB(sb)->s_mount_opt |= \ |
| 990 | EXT4_MOUNT_##opt |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 991 | #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \ |
| 992 | EXT4_MOUNT_##opt) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 993 | |
Theodore Ts'o | a2595b8 | 2010-12-15 20:30:48 -0500 | [diff] [blame] | 994 | #define clear_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 &= \ |
| 995 | ~EXT4_MOUNT2_##opt |
| 996 | #define set_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 |= \ |
| 997 | EXT4_MOUNT2_##opt |
| 998 | #define test_opt2(sb, opt) (EXT4_SB(sb)->s_mount_opt2 & \ |
| 999 | EXT4_MOUNT2_##opt) |
| 1000 | |
Akinobu Mita | 597d508 | 2011-12-28 20:32:07 -0500 | [diff] [blame] | 1001 | #define ext4_test_and_set_bit __test_and_set_bit_le |
| 1002 | #define ext4_set_bit __set_bit_le |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1003 | #define ext4_set_bit_atomic ext2_set_bit_atomic |
Akinobu Mita | 597d508 | 2011-12-28 20:32:07 -0500 | [diff] [blame] | 1004 | #define ext4_test_and_clear_bit __test_and_clear_bit_le |
| 1005 | #define ext4_clear_bit __clear_bit_le |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1006 | #define ext4_clear_bit_atomic ext2_clear_bit_atomic |
Akinobu Mita | 50e0168 | 2011-03-23 16:42:07 -0700 | [diff] [blame] | 1007 | #define ext4_test_bit test_bit_le |
Akinobu Mita | 50e0168 | 2011-03-23 16:42:07 -0700 | [diff] [blame] | 1008 | #define ext4_find_next_zero_bit find_next_zero_bit_le |
| 1009 | #define ext4_find_next_bit find_next_bit_le |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1010 | |
Yongqiang Yang | c3e94d1 | 2011-07-26 22:05:53 -0400 | [diff] [blame] | 1011 | extern void ext4_set_bits(void *bm, int cur, int len); |
| 1012 | |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1013 | /* |
| 1014 | * Maximal mount counts between two filesystem checks |
| 1015 | */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1016 | #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ |
| 1017 | #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */ |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1018 | |
| 1019 | /* |
| 1020 | * Behaviour when detecting errors |
| 1021 | */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1022 | #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */ |
| 1023 | #define EXT4_ERRORS_RO 2 /* Remount fs read-only */ |
| 1024 | #define EXT4_ERRORS_PANIC 3 /* Panic */ |
| 1025 | #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1026 | |
Darrick J. Wong | e615391 | 2012-04-29 18:23:10 -0400 | [diff] [blame] | 1027 | /* Metadata checksum algorithm codes */ |
| 1028 | #define EXT4_CRC32C_CHKSUM 1 |
| 1029 | |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1030 | /* |
| 1031 | * Structure of the super block |
| 1032 | */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1033 | struct ext4_super_block { |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1034 | /*00*/ __le32 s_inodes_count; /* Inodes count */ |
Aneesh Kumar K.V | 6bc9fef | 2007-10-16 18:38:25 -0400 | [diff] [blame] | 1035 | __le32 s_blocks_count_lo; /* Blocks count */ |
Aneesh Kumar K.V | 308ba3e | 2007-10-16 18:38:25 -0400 | [diff] [blame] | 1036 | __le32 s_r_blocks_count_lo; /* Reserved blocks count */ |
| 1037 | __le32 s_free_blocks_count_lo; /* Free blocks count */ |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1038 | /*10*/ __le32 s_free_inodes_count; /* Free inodes count */ |
| 1039 | __le32 s_first_data_block; /* First Data Block */ |
| 1040 | __le32 s_log_block_size; /* Block size */ |
Theodore Ts'o | 281b599 | 2011-09-09 18:34:51 -0400 | [diff] [blame] | 1041 | __le32 s_log_cluster_size; /* Allocation cluster size */ |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1042 | /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */ |
Theodore Ts'o | 281b599 | 2011-09-09 18:34:51 -0400 | [diff] [blame] | 1043 | __le32 s_clusters_per_group; /* # Clusters per group */ |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1044 | __le32 s_inodes_per_group; /* # Inodes per group */ |
| 1045 | __le32 s_mtime; /* Mount time */ |
| 1046 | /*30*/ __le32 s_wtime; /* Write time */ |
| 1047 | __le16 s_mnt_count; /* Mount count */ |
| 1048 | __le16 s_max_mnt_count; /* Maximal mount count */ |
| 1049 | __le16 s_magic; /* Magic signature */ |
| 1050 | __le16 s_state; /* File system state */ |
| 1051 | __le16 s_errors; /* Behaviour when detecting errors */ |
| 1052 | __le16 s_minor_rev_level; /* minor revision level */ |
| 1053 | /*40*/ __le32 s_lastcheck; /* time of last check */ |
| 1054 | __le32 s_checkinterval; /* max. time between checks */ |
| 1055 | __le32 s_creator_os; /* OS */ |
| 1056 | __le32 s_rev_level; /* Revision level */ |
| 1057 | /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */ |
| 1058 | __le16 s_def_resgid; /* Default gid for reserved blocks */ |
| 1059 | /* |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1060 | * These fields are for EXT4_DYNAMIC_REV superblocks only. |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1061 | * |
| 1062 | * Note: the difference between the compatible feature set and |
| 1063 | * the incompatible feature set is that if there is a bit set |
| 1064 | * in the incompatible feature set that the kernel doesn't |
| 1065 | * know about, it should refuse to mount the filesystem. |
| 1066 | * |
| 1067 | * e2fsck's requirements are more strict; if it doesn't know |
| 1068 | * about a feature in either the compatible or incompatible |
| 1069 | * feature set, it must abort and not try to meddle with |
| 1070 | * things it doesn't understand... |
| 1071 | */ |
| 1072 | __le32 s_first_ino; /* First non-reserved inode */ |
Alexandre Ratchov | 0d1ee42 | 2006-10-11 01:21:14 -0700 | [diff] [blame] | 1073 | __le16 s_inode_size; /* size of inode structure */ |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1074 | __le16 s_block_group_nr; /* block group # of this superblock */ |
| 1075 | __le32 s_feature_compat; /* compatible feature set */ |
| 1076 | /*60*/ __le32 s_feature_incompat; /* incompatible feature set */ |
| 1077 | __le32 s_feature_ro_compat; /* readonly-compatible feature set */ |
| 1078 | /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */ |
| 1079 | /*78*/ char s_volume_name[16]; /* volume name */ |
| 1080 | /*88*/ char s_last_mounted[64]; /* directory where last mounted */ |
| 1081 | /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */ |
| 1082 | /* |
| 1083 | * Performance hints. Directory preallocation should only |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1084 | * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on. |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1085 | */ |
| 1086 | __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ |
| 1087 | __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ |
| 1088 | __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */ |
| 1089 | /* |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1090 | * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set. |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1091 | */ |
| 1092 | /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */ |
| 1093 | /*E0*/ __le32 s_journal_inum; /* inode number of journal file */ |
| 1094 | __le32 s_journal_dev; /* device number of journal file */ |
| 1095 | __le32 s_last_orphan; /* start of list of inodes to delete */ |
| 1096 | __le32 s_hash_seed[4]; /* HTREE hash seed */ |
| 1097 | __u8 s_def_hash_version; /* Default hash version to use */ |
Theodore Ts'o | 89eeddf | 2010-07-27 11:56:04 -0400 | [diff] [blame] | 1098 | __u8 s_jnl_backup_type; |
Alexandre Ratchov | 0d1ee42 | 2006-10-11 01:21:14 -0700 | [diff] [blame] | 1099 | __le16 s_desc_size; /* size of group descriptor */ |
Laurent Vivier | bd81d8e | 2006-10-11 01:21:10 -0700 | [diff] [blame] | 1100 | /*100*/ __le32 s_default_mount_opts; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1101 | __le32 s_first_meta_bg; /* First metablock block group */ |
Laurent Vivier | bd81d8e | 2006-10-11 01:21:10 -0700 | [diff] [blame] | 1102 | __le32 s_mkfs_time; /* When the filesystem was created */ |
| 1103 | __le32 s_jnl_blocks[17]; /* Backup of the journal inode */ |
| 1104 | /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */ |
| 1105 | /*150*/ __le32 s_blocks_count_hi; /* Blocks count */ |
| 1106 | __le32 s_r_blocks_count_hi; /* Reserved blocks count */ |
| 1107 | __le32 s_free_blocks_count_hi; /* Free blocks count */ |
Aneesh Kumar K.V | c1bddad | 2007-10-16 18:38:25 -0400 | [diff] [blame] | 1108 | __le16 s_min_extra_isize; /* All inodes have at least # bytes */ |
| 1109 | __le16 s_want_extra_isize; /* New inodes should reserve # bytes */ |
| 1110 | __le32 s_flags; /* Miscellaneous flags */ |
| 1111 | __le16 s_raid_stride; /* RAID stride */ |
Johann Lombardi | c5e06d1 | 2011-05-24 18:31:25 -0400 | [diff] [blame] | 1112 | __le16 s_mmp_update_interval; /* # seconds to wait in MMP checking */ |
Aneesh Kumar K.V | c1bddad | 2007-10-16 18:38:25 -0400 | [diff] [blame] | 1113 | __le64 s_mmp_block; /* Block for multi-mount protection */ |
| 1114 | __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/ |
Jose R. Santos | 772cb7c | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 1115 | __u8 s_log_groups_per_flex; /* FLEX_BG group size */ |
Darrick J. Wong | e615391 | 2012-04-29 18:23:10 -0400 | [diff] [blame] | 1116 | __u8 s_checksum_type; /* metadata checksum algorithm used */ |
Jose R. Santos | 772cb7c | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 1117 | __le16 s_reserved_pad; |
Theodore Ts'o | afc32f7 | 2009-02-28 19:39:58 -0500 | [diff] [blame] | 1118 | __le64 s_kbytes_written; /* nr of lifetime kilobytes written */ |
Theodore Ts'o | 4a9cdec | 2010-06-29 11:00:23 -0400 | [diff] [blame] | 1119 | __le32 s_snapshot_inum; /* Inode number of active snapshot */ |
| 1120 | __le32 s_snapshot_id; /* sequential ID of active snapshot */ |
| 1121 | __le64 s_snapshot_r_blocks_count; /* reserved blocks for active |
| 1122 | snapshot's future use */ |
| 1123 | __le32 s_snapshot_list; /* inode number of the head of the |
| 1124 | on-disk snapshot list */ |
Theodore Ts'o | 1c13d5c | 2010-07-27 11:56:03 -0400 | [diff] [blame] | 1125 | #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count) |
| 1126 | __le32 s_error_count; /* number of fs errors */ |
| 1127 | __le32 s_first_error_time; /* first time an error happened */ |
| 1128 | __le32 s_first_error_ino; /* inode involved in first error */ |
| 1129 | __le64 s_first_error_block; /* block involved of first error */ |
| 1130 | __u8 s_first_error_func[32]; /* function where the error happened */ |
| 1131 | __le32 s_first_error_line; /* line number where error happened */ |
| 1132 | __le32 s_last_error_time; /* most recent time of an error */ |
| 1133 | __le32 s_last_error_ino; /* inode involved in last error */ |
| 1134 | __le32 s_last_error_line; /* line number where error happened */ |
| 1135 | __le64 s_last_error_block; /* block involved of last error */ |
| 1136 | __u8 s_last_error_func[32]; /* function where the error happened */ |
Theodore Ts'o | 8b67f04 | 2010-08-01 23:14:20 -0400 | [diff] [blame] | 1137 | #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts) |
| 1138 | __u8 s_mount_opts[64]; |
Theodore Ts'o | 281b599 | 2011-09-09 18:34:51 -0400 | [diff] [blame] | 1139 | __le32 s_usr_quota_inum; /* inode for tracking user quota */ |
| 1140 | __le32 s_grp_quota_inum; /* inode for tracking group quota */ |
| 1141 | __le32 s_overhead_clusters; /* overhead blocks/clusters in fs */ |
Darrick J. Wong | e615391 | 2012-04-29 18:23:10 -0400 | [diff] [blame] | 1142 | __le32 s_reserved[108]; /* Padding to the end of the block */ |
| 1143 | __le32 s_checksum; /* crc32c(superblock) */ |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1144 | }; |
| 1145 | |
Theodore Ts'o | 1c13d5c | 2010-07-27 11:56:03 -0400 | [diff] [blame] | 1146 | #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START) |
| 1147 | |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1148 | #ifdef __KERNEL__ |
Theodore Ts'o | bc0b0d6 | 2009-06-13 10:09:48 -0400 | [diff] [blame] | 1149 | |
| 1150 | /* |
Theodore Ts'o | 4ab2f15 | 2009-06-13 10:09:36 -0400 | [diff] [blame] | 1151 | * run-time mount flags |
Theodore Ts'o | bc0b0d6 | 2009-06-13 10:09:48 -0400 | [diff] [blame] | 1152 | */ |
| 1153 | #define EXT4_MF_MNTDIR_SAMPLED 0x0001 |
Theodore Ts'o | 4ab2f15 | 2009-06-13 10:09:36 -0400 | [diff] [blame] | 1154 | #define EXT4_MF_FS_ABORTED 0x0002 /* Fatal error detected */ |
Theodore Ts'o | bc0b0d6 | 2009-06-13 10:09:48 -0400 | [diff] [blame] | 1155 | |
Theodore Ts'o | ca0faba | 2009-05-03 16:33:44 -0400 | [diff] [blame] | 1156 | /* |
| 1157 | * fourth extended-fs super-block data in memory |
| 1158 | */ |
| 1159 | struct ext4_sb_info { |
| 1160 | unsigned long s_desc_size; /* Size of a group descriptor in bytes */ |
| 1161 | unsigned long s_inodes_per_block;/* Number of inodes per block */ |
| 1162 | unsigned long s_blocks_per_group;/* Number of blocks in a group */ |
Theodore Ts'o | 281b599 | 2011-09-09 18:34:51 -0400 | [diff] [blame] | 1163 | unsigned long s_clusters_per_group; /* Number of clusters in a group */ |
Theodore Ts'o | ca0faba | 2009-05-03 16:33:44 -0400 | [diff] [blame] | 1164 | unsigned long s_inodes_per_group;/* Number of inodes in a group */ |
| 1165 | unsigned long s_itb_per_group; /* Number of inode table blocks per group */ |
| 1166 | unsigned long s_gdb_count; /* Number of group descriptor blocks */ |
| 1167 | unsigned long s_desc_per_block; /* Number of group descriptors per block */ |
| 1168 | ext4_group_t s_groups_count; /* Number of groups in the fs */ |
Eric Sandeen | fb0a387 | 2009-09-16 14:45:10 -0400 | [diff] [blame] | 1169 | ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */ |
Theodore Ts'o | 952fc18 | 2012-07-09 16:27:05 -0400 | [diff] [blame] | 1170 | unsigned long s_overhead; /* # of fs overhead clusters */ |
Theodore Ts'o | 281b599 | 2011-09-09 18:34:51 -0400 | [diff] [blame] | 1171 | unsigned int s_cluster_ratio; /* Number of blocks per cluster */ |
| 1172 | unsigned int s_cluster_bits; /* log2 of s_cluster_ratio */ |
Theodore Ts'o | ca0faba | 2009-05-03 16:33:44 -0400 | [diff] [blame] | 1173 | loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */ |
| 1174 | struct buffer_head * s_sbh; /* Buffer containing the super block */ |
| 1175 | struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */ |
| 1176 | struct buffer_head **s_group_desc; |
Theodore Ts'o | 7f4520c | 2009-06-13 10:09:41 -0400 | [diff] [blame] | 1177 | unsigned int s_mount_opt; |
Theodore Ts'o | a2595b8 | 2010-12-15 20:30:48 -0500 | [diff] [blame] | 1178 | unsigned int s_mount_opt2; |
Theodore Ts'o | bc0b0d6 | 2009-06-13 10:09:48 -0400 | [diff] [blame] | 1179 | unsigned int s_mount_flags; |
Theodore Ts'o | 5a916be | 2012-03-04 19:27:31 -0500 | [diff] [blame] | 1180 | unsigned int s_def_mount_opt; |
Theodore Ts'o | ca0faba | 2009-05-03 16:33:44 -0400 | [diff] [blame] | 1181 | ext4_fsblk_t s_sb_block; |
Eric W. Biederman | 08cefc7 | 2012-02-07 15:41:49 -0800 | [diff] [blame] | 1182 | kuid_t s_resuid; |
| 1183 | kgid_t s_resgid; |
Theodore Ts'o | ca0faba | 2009-05-03 16:33:44 -0400 | [diff] [blame] | 1184 | unsigned short s_mount_state; |
| 1185 | unsigned short s_pad; |
| 1186 | int s_addr_per_block_bits; |
| 1187 | int s_desc_per_block_bits; |
| 1188 | int s_inode_size; |
| 1189 | int s_first_ino; |
| 1190 | unsigned int s_inode_readahead_blks; |
Andreas Dilger | 1101391 | 2009-06-13 11:45:35 -0400 | [diff] [blame] | 1191 | unsigned int s_inode_goal; |
Theodore Ts'o | ca0faba | 2009-05-03 16:33:44 -0400 | [diff] [blame] | 1192 | spinlock_t s_next_gen_lock; |
| 1193 | u32 s_next_generation; |
| 1194 | u32 s_hash_seed[4]; |
| 1195 | int s_def_hash_version; |
| 1196 | int s_hash_unsigned; /* 3 if hash should be signed, 0 if not */ |
Theodore Ts'o | 5704265 | 2011-09-09 18:56:51 -0400 | [diff] [blame] | 1197 | struct percpu_counter s_freeclusters_counter; |
Theodore Ts'o | ca0faba | 2009-05-03 16:33:44 -0400 | [diff] [blame] | 1198 | struct percpu_counter s_freeinodes_counter; |
| 1199 | struct percpu_counter s_dirs_counter; |
Theodore Ts'o | 5704265 | 2011-09-09 18:56:51 -0400 | [diff] [blame] | 1200 | struct percpu_counter s_dirtyclusters_counter; |
Theodore Ts'o | ca0faba | 2009-05-03 16:33:44 -0400 | [diff] [blame] | 1201 | struct blockgroup_lock *s_blockgroup_lock; |
| 1202 | struct proc_dir_entry *s_proc; |
| 1203 | struct kobject s_kobj; |
| 1204 | struct completion s_kobj_unregister; |
Theodore Ts'o | 2c0544b | 2012-05-30 22:56:46 -0400 | [diff] [blame] | 1205 | struct super_block *s_sb; |
Theodore Ts'o | ca0faba | 2009-05-03 16:33:44 -0400 | [diff] [blame] | 1206 | |
| 1207 | /* Journaling */ |
Theodore Ts'o | ca0faba | 2009-05-03 16:33:44 -0400 | [diff] [blame] | 1208 | struct journal_s *s_journal; |
| 1209 | struct list_head s_orphan; |
| 1210 | struct mutex s_orphan_lock; |
Yongqiang Yang | 8f82f84 | 2011-07-26 21:35:44 -0400 | [diff] [blame] | 1211 | unsigned long s_resize_flags; /* Flags indicating if there |
| 1212 | is a resizer */ |
Theodore Ts'o | ca0faba | 2009-05-03 16:33:44 -0400 | [diff] [blame] | 1213 | unsigned long s_commit_interval; |
| 1214 | u32 s_max_batch_time; |
| 1215 | u32 s_min_batch_time; |
| 1216 | struct block_device *journal_bdev; |
Theodore Ts'o | ca0faba | 2009-05-03 16:33:44 -0400 | [diff] [blame] | 1217 | #ifdef CONFIG_QUOTA |
| 1218 | char *s_qf_names[MAXQUOTAS]; /* Names of quota files with journalled quota */ |
| 1219 | int s_jquota_fmt; /* Format of quota to use */ |
| 1220 | #endif |
| 1221 | unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */ |
Theodore Ts'o | 6fd058f | 2009-05-17 15:38:01 -0400 | [diff] [blame] | 1222 | struct rb_root system_blks; |
Theodore Ts'o | ca0faba | 2009-05-03 16:33:44 -0400 | [diff] [blame] | 1223 | |
| 1224 | #ifdef EXTENTS_STATS |
| 1225 | /* ext4 extents stats */ |
| 1226 | unsigned long s_ext_min; |
| 1227 | unsigned long s_ext_max; |
| 1228 | unsigned long s_depth_max; |
| 1229 | spinlock_t s_ext_stats_lock; |
| 1230 | unsigned long s_ext_blocks; |
| 1231 | unsigned long s_ext_extents; |
| 1232 | #endif |
| 1233 | |
| 1234 | /* for buddy allocator */ |
| 1235 | struct ext4_group_info ***s_group_info; |
| 1236 | struct inode *s_buddy_cache; |
Theodore Ts'o | ca0faba | 2009-05-03 16:33:44 -0400 | [diff] [blame] | 1237 | spinlock_t s_md_lock; |
Theodore Ts'o | ca0faba | 2009-05-03 16:33:44 -0400 | [diff] [blame] | 1238 | unsigned short *s_mb_offsets; |
| 1239 | unsigned int *s_mb_maxs; |
Theodore Ts'o | 28623c2 | 2012-09-05 01:31:50 -0400 | [diff] [blame] | 1240 | unsigned int s_group_info_size; |
Theodore Ts'o | ca0faba | 2009-05-03 16:33:44 -0400 | [diff] [blame] | 1241 | |
| 1242 | /* tunables */ |
| 1243 | unsigned long s_stripe; |
| 1244 | unsigned int s_mb_stream_request; |
| 1245 | unsigned int s_mb_max_to_scan; |
| 1246 | unsigned int s_mb_min_to_scan; |
| 1247 | unsigned int s_mb_stats; |
| 1248 | unsigned int s_mb_order2_reqs; |
| 1249 | unsigned int s_mb_group_prealloc; |
Theodore Ts'o | 55138e0 | 2009-09-29 13:31:31 -0400 | [diff] [blame] | 1250 | unsigned int s_max_writeback_mb_bump; |
Theodore Ts'o | df981d0 | 2012-08-17 09:48:17 -0400 | [diff] [blame] | 1251 | unsigned int s_max_dir_size_kb; |
Theodore Ts'o | ca0faba | 2009-05-03 16:33:44 -0400 | [diff] [blame] | 1252 | /* where last allocation was done - for stream allocation */ |
| 1253 | unsigned long s_mb_last_group; |
| 1254 | unsigned long s_mb_last_start; |
| 1255 | |
Theodore Ts'o | ca0faba | 2009-05-03 16:33:44 -0400 | [diff] [blame] | 1256 | /* stats for buddy allocator */ |
Theodore Ts'o | ca0faba | 2009-05-03 16:33:44 -0400 | [diff] [blame] | 1257 | atomic_t s_bal_reqs; /* number of reqs with len > 1 */ |
| 1258 | atomic_t s_bal_success; /* we found long enough chunks */ |
| 1259 | atomic_t s_bal_allocated; /* in blocks */ |
| 1260 | atomic_t s_bal_ex_scanned; /* total extents scanned */ |
| 1261 | atomic_t s_bal_goals; /* goal hits */ |
| 1262 | atomic_t s_bal_breaks; /* too long searches */ |
| 1263 | atomic_t s_bal_2orders; /* 2^order hits */ |
| 1264 | spinlock_t s_bal_lock; |
| 1265 | unsigned long s_mb_buddies_generated; |
| 1266 | unsigned long long s_mb_generation_time; |
| 1267 | atomic_t s_mb_lost_chunks; |
| 1268 | atomic_t s_mb_preallocated; |
| 1269 | atomic_t s_mb_discarded; |
Theodore Ts'o | 5079748 | 2009-09-18 13:34:02 -0400 | [diff] [blame] | 1270 | atomic_t s_lock_busy; |
Theodore Ts'o | ca0faba | 2009-05-03 16:33:44 -0400 | [diff] [blame] | 1271 | |
| 1272 | /* locality groups */ |
Tejun Heo | 003cb60 | 2010-02-02 14:39:01 +0900 | [diff] [blame] | 1273 | struct ext4_locality_group __percpu *s_locality_groups; |
Theodore Ts'o | ca0faba | 2009-05-03 16:33:44 -0400 | [diff] [blame] | 1274 | |
| 1275 | /* for write statistics */ |
| 1276 | unsigned long s_sectors_written_start; |
| 1277 | u64 s_kbytes_written; |
| 1278 | |
Zheng Liu | 67a5da5 | 2012-08-17 09:54:17 -0400 | [diff] [blame] | 1279 | /* the size of zero-out chunk */ |
| 1280 | unsigned int s_extent_max_zeroout_kb; |
| 1281 | |
Theodore Ts'o | ca0faba | 2009-05-03 16:33:44 -0400 | [diff] [blame] | 1282 | unsigned int s_log_groups_per_flex; |
| 1283 | struct flex_groups *s_flex_groups; |
Theodore Ts'o | 117fff1 | 2012-09-05 01:29:50 -0400 | [diff] [blame] | 1284 | ext4_group_t s_flex_groups_allocated; |
Mingming Cao | 4c0425f | 2009-09-28 15:48:41 -0400 | [diff] [blame] | 1285 | |
| 1286 | /* workqueue for dio unwritten */ |
| 1287 | struct workqueue_struct *dio_unwritten_wq; |
Theodore Ts'o | 66e61a9 | 2010-07-27 11:56:04 -0400 | [diff] [blame] | 1288 | |
| 1289 | /* timer for periodic error stats printing */ |
| 1290 | struct timer_list s_err_report; |
Lukas Czerner | bfff687 | 2010-10-27 21:30:05 -0400 | [diff] [blame] | 1291 | |
| 1292 | /* Lazy inode table initialization info */ |
| 1293 | struct ext4_li_request *s_li_request; |
| 1294 | /* Wait multiplier for lazy initialization thread */ |
| 1295 | unsigned int s_li_wait_mult; |
Johann Lombardi | c5e06d1 | 2011-05-24 18:31:25 -0400 | [diff] [blame] | 1296 | |
| 1297 | /* Kernel thread for multiple mount protection */ |
| 1298 | struct task_struct *s_mmp_tsk; |
Tao Ma | 3d56b8d | 2011-07-11 00:03:38 -0400 | [diff] [blame] | 1299 | |
| 1300 | /* record the last minlen when FITRIM is called. */ |
| 1301 | atomic_t s_last_trim_minblks; |
Darrick J. Wong | 0441984 | 2012-04-29 18:27:10 -0400 | [diff] [blame] | 1302 | |
| 1303 | /* Reference to checksum algorithm driver via cryptoapi */ |
| 1304 | struct crypto_shash *s_chksum_driver; |
Darrick J. Wong | a9c47317 | 2012-04-29 18:29:10 -0400 | [diff] [blame] | 1305 | |
| 1306 | /* Precomputed FS UUID checksum for seeding other checksums */ |
| 1307 | __u32 s_csum_seed; |
Zheng Liu | 74cd15c | 2013-02-18 00:32:55 -0500 | [diff] [blame] | 1308 | |
| 1309 | /* Reclaim extents from extent status tree */ |
| 1310 | struct shrinker s_es_shrinker; |
| 1311 | struct list_head s_es_lru; |
Theodore Ts'o | 1ac6466 | 2013-03-02 10:27:46 -0500 | [diff] [blame] | 1312 | struct percpu_counter s_extent_cache_cnt; |
Zheng Liu | 74cd15c | 2013-02-18 00:32:55 -0500 | [diff] [blame] | 1313 | spinlock_t s_es_lru_lock ____cacheline_aligned_in_smp; |
Theodore Ts'o | ca0faba | 2009-05-03 16:33:44 -0400 | [diff] [blame] | 1314 | }; |
| 1315 | |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 1316 | static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1317 | { |
| 1318 | return sb->s_fs_info; |
| 1319 | } |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1320 | static inline struct ext4_inode_info *EXT4_I(struct inode *inode) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1321 | { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1322 | return container_of(inode, struct ext4_inode_info, vfs_inode); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1323 | } |
| 1324 | |
Kalpak Shah | ef7f383 | 2007-07-18 09:15:20 -0400 | [diff] [blame] | 1325 | static inline struct timespec ext4_current_time(struct inode *inode) |
| 1326 | { |
| 1327 | return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ? |
| 1328 | current_fs_time(inode->i_sb) : CURRENT_TIME_SEC; |
| 1329 | } |
| 1330 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1331 | 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] | 1332 | { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1333 | return ino == EXT4_ROOT_INO || |
Aditya Kali | 7c319d3 | 2012-07-22 20:21:31 -0400 | [diff] [blame] | 1334 | ino == EXT4_USR_QUOTA_INO || |
| 1335 | ino == EXT4_GRP_QUOTA_INO || |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1336 | ino == EXT4_JOURNAL_INO || |
| 1337 | ino == EXT4_RESIZE_INO || |
| 1338 | (ino >= EXT4_FIRST_INO(sb) && |
| 1339 | ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count)); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1340 | } |
Theodore Ts'o | 19f5fb7 | 2010-01-24 14:34:07 -0500 | [diff] [blame] | 1341 | |
Tao Ma | 0edeb71 | 2011-10-31 17:30:44 -0400 | [diff] [blame] | 1342 | static inline void ext4_set_io_unwritten_flag(struct inode *inode, |
| 1343 | struct ext4_io_end *io_end) |
| 1344 | { |
| 1345 | if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) { |
| 1346 | io_end->flag |= EXT4_IO_END_UNWRITTEN; |
Dmitry Monakhov | e27f41e | 2012-09-28 23:24:52 -0400 | [diff] [blame] | 1347 | atomic_inc(&EXT4_I(inode)->i_unwritten); |
Tao Ma | 0edeb71 | 2011-10-31 17:30:44 -0400 | [diff] [blame] | 1348 | } |
| 1349 | } |
| 1350 | |
Dmitry Monakhov | f45ee3a | 2012-09-28 23:21:09 -0400 | [diff] [blame] | 1351 | static inline ext4_io_end_t *ext4_inode_aio(struct inode *inode) |
| 1352 | { |
| 1353 | return inode->i_private; |
| 1354 | } |
| 1355 | |
| 1356 | static inline void ext4_inode_aio_set(struct inode *inode, ext4_io_end_t *io) |
| 1357 | { |
| 1358 | inode->i_private = io; |
| 1359 | } |
| 1360 | |
Theodore Ts'o | 19f5fb7 | 2010-01-24 14:34:07 -0500 | [diff] [blame] | 1361 | /* |
| 1362 | * Inode dynamic state flags |
| 1363 | */ |
| 1364 | enum { |
| 1365 | EXT4_STATE_JDATA, /* journaled data exists */ |
| 1366 | EXT4_STATE_NEW, /* inode is newly created */ |
| 1367 | EXT4_STATE_XATTR, /* has in-inode xattrs */ |
| 1368 | EXT4_STATE_NO_EXPAND, /* No space for expansion */ |
| 1369 | EXT4_STATE_DA_ALLOC_CLOSE, /* Alloc DA blks on close */ |
| 1370 | EXT4_STATE_EXT_MIGRATE, /* Inode is migrating */ |
| 1371 | EXT4_STATE_DIO_UNWRITTEN, /* need convert on dio done*/ |
Frank Mayhar | 14ece10 | 2010-05-17 08:00:00 -0400 | [diff] [blame] | 1372 | EXT4_STATE_NEWENTRY, /* File just added to dir */ |
Theodore Ts'o | f232109 | 2011-01-10 12:12:36 -0500 | [diff] [blame] | 1373 | EXT4_STATE_DELALLOC_RESERVED, /* blks already reserved for delalloc */ |
Dmitry Monakhov | 17335dc | 2012-09-29 00:41:21 -0400 | [diff] [blame] | 1374 | EXT4_STATE_DIOREAD_LOCK, /* Disable support for dio read |
| 1375 | nolocking */ |
Tao Ma | 67cf5b0 | 2012-12-10 14:04:46 -0500 | [diff] [blame] | 1376 | EXT4_STATE_MAY_INLINE_DATA, /* may have in-inode data */ |
Theodore Ts'o | 19f5fb7 | 2010-01-24 14:34:07 -0500 | [diff] [blame] | 1377 | }; |
| 1378 | |
Theodore Ts'o | 353eb83 | 2011-01-10 12:18:25 -0500 | [diff] [blame] | 1379 | #define EXT4_INODE_BIT_FNS(name, field, offset) \ |
Dmitry Monakhov | 12e9b89 | 2010-05-16 22:00:00 -0400 | [diff] [blame] | 1380 | static inline int ext4_test_inode_##name(struct inode *inode, int bit) \ |
| 1381 | { \ |
Theodore Ts'o | 353eb83 | 2011-01-10 12:18:25 -0500 | [diff] [blame] | 1382 | return test_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ |
Dmitry Monakhov | 12e9b89 | 2010-05-16 22:00:00 -0400 | [diff] [blame] | 1383 | } \ |
| 1384 | static inline void ext4_set_inode_##name(struct inode *inode, int bit) \ |
| 1385 | { \ |
Theodore Ts'o | 353eb83 | 2011-01-10 12:18:25 -0500 | [diff] [blame] | 1386 | set_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ |
Dmitry Monakhov | 12e9b89 | 2010-05-16 22:00:00 -0400 | [diff] [blame] | 1387 | } \ |
| 1388 | static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \ |
| 1389 | { \ |
Theodore Ts'o | 353eb83 | 2011-01-10 12:18:25 -0500 | [diff] [blame] | 1390 | clear_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ |
Theodore Ts'o | 19f5fb7 | 2010-01-24 14:34:07 -0500 | [diff] [blame] | 1391 | } |
| 1392 | |
Theodore Ts'o | 353eb83 | 2011-01-10 12:18:25 -0500 | [diff] [blame] | 1393 | EXT4_INODE_BIT_FNS(flag, flags, 0) |
| 1394 | #if (BITS_PER_LONG < 64) |
| 1395 | EXT4_INODE_BIT_FNS(state, state_flags, 0) |
| 1396 | |
| 1397 | static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) |
| 1398 | { |
| 1399 | (ei)->i_state_flags = 0; |
| 1400 | } |
| 1401 | #else |
| 1402 | EXT4_INODE_BIT_FNS(state, flags, 32) |
| 1403 | |
| 1404 | static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) |
| 1405 | { |
| 1406 | /* We depend on the fact that callers will set i_flags */ |
| 1407 | } |
| 1408 | #endif |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1409 | #else |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1410 | /* Assume that user mode programs are passing in an ext4fs superblock, not |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1411 | * a kernel struct super_block. This will allow us to call the feature-test |
| 1412 | * macros from user land. */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1413 | #define EXT4_SB(sb) (sb) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1414 | #endif |
| 1415 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1416 | #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1417 | |
| 1418 | /* |
| 1419 | * Codes for operating systems |
| 1420 | */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1421 | #define EXT4_OS_LINUX 0 |
| 1422 | #define EXT4_OS_HURD 1 |
| 1423 | #define EXT4_OS_MASIX 2 |
| 1424 | #define EXT4_OS_FREEBSD 3 |
| 1425 | #define EXT4_OS_LITES 4 |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1426 | |
| 1427 | /* |
| 1428 | * Revision levels |
| 1429 | */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1430 | #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */ |
| 1431 | #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1432 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1433 | #define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV |
| 1434 | #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1435 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1436 | #define EXT4_GOOD_OLD_INODE_SIZE 128 |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1437 | |
| 1438 | /* |
| 1439 | * Feature set definitions |
| 1440 | */ |
| 1441 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1442 | #define EXT4_HAS_COMPAT_FEATURE(sb,mask) \ |
Aneesh Kumar K.V | 3a06d77 | 2008-11-22 15:04:59 -0500 | [diff] [blame] | 1443 | ((EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask)) != 0) |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1444 | #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \ |
Aneesh Kumar K.V | 3a06d77 | 2008-11-22 15:04:59 -0500 | [diff] [blame] | 1445 | ((EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask)) != 0) |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1446 | #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \ |
Aneesh Kumar K.V | 3a06d77 | 2008-11-22 15:04:59 -0500 | [diff] [blame] | 1447 | ((EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask)) != 0) |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1448 | #define EXT4_SET_COMPAT_FEATURE(sb,mask) \ |
| 1449 | EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask) |
| 1450 | #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \ |
| 1451 | EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask) |
| 1452 | #define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \ |
| 1453 | EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask) |
| 1454 | #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \ |
| 1455 | EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask) |
| 1456 | #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \ |
| 1457 | EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask) |
| 1458 | #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \ |
| 1459 | EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1460 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1461 | #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001 |
| 1462 | #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002 |
| 1463 | #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004 |
| 1464 | #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008 |
| 1465 | #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010 |
| 1466 | #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020 |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1467 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1468 | #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 |
| 1469 | #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 |
| 1470 | #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 |
Aneesh Kumar K.V | 0fc1b45 | 2008-01-28 23:58:26 -0500 | [diff] [blame] | 1471 | #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008 |
Andreas Dilger | 717d50e | 2007-10-16 18:38:25 -0400 | [diff] [blame] | 1472 | #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010 |
Andreas Dilger | f8628a1 | 2007-07-18 08:38:01 -0400 | [diff] [blame] | 1473 | #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020 |
Kalpak Shah | ef7f383 | 2007-07-18 09:15:20 -0400 | [diff] [blame] | 1474 | #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040 |
Aditya Kali | ae81230 | 2011-05-24 19:00:39 -0400 | [diff] [blame] | 1475 | #define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100 |
Theodore Ts'o | 281b599 | 2011-09-09 18:34:51 -0400 | [diff] [blame] | 1476 | #define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200 |
Darrick J. Wong | e615391 | 2012-04-29 18:23:10 -0400 | [diff] [blame] | 1477 | /* |
| 1478 | * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM). When |
| 1479 | * METADATA_CSUM is set, group descriptor checksums use the same algorithm as |
| 1480 | * all other data structures' checksums. However, the METADATA_CSUM and |
| 1481 | * GDT_CSUM bits are mutually exclusive. |
| 1482 | */ |
Theodore Ts'o | 9b90e5e | 2012-01-04 22:01:53 -0500 | [diff] [blame] | 1483 | #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400 |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1484 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1485 | #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001 |
| 1486 | #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002 |
| 1487 | #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */ |
| 1488 | #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */ |
| 1489 | #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010 |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1490 | #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */ |
Laurent Vivier | bd81d8e | 2006-10-11 01:21:10 -0700 | [diff] [blame] | 1491 | #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080 |
Aneesh Kumar K.V | 0fc1b45 | 2008-01-28 23:58:26 -0500 | [diff] [blame] | 1492 | #define EXT4_FEATURE_INCOMPAT_MMP 0x0100 |
Jose R. Santos | ce42158 | 2007-10-16 18:38:25 -0400 | [diff] [blame] | 1493 | #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200 |
Theodore Ts'o | f710b4b | 2010-01-25 03:31:32 -0500 | [diff] [blame] | 1494 | #define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 /* EA in inode */ |
| 1495 | #define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 /* data in dirent */ |
Theodore Ts'o | 856cbcf | 2012-02-20 17:53:01 -0500 | [diff] [blame] | 1496 | #define EXT4_FEATURE_INCOMPAT_BG_USE_META_CSUM 0x2000 /* use crc32c for bg */ |
Theodore Ts'o | 9b90e5e | 2012-01-04 22:01:53 -0500 | [diff] [blame] | 1497 | #define EXT4_FEATURE_INCOMPAT_LARGEDIR 0x4000 /* >2GB or 3-lvl htree */ |
Tao Ma | 67cf5b0 | 2012-12-10 14:04:46 -0500 | [diff] [blame] | 1498 | #define EXT4_FEATURE_INCOMPAT_INLINE_DATA 0x8000 /* data in inode */ |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1499 | |
Theodore Ts'o | 2035e77 | 2011-04-18 17:29:14 -0400 | [diff] [blame] | 1500 | #define EXT2_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR |
| 1501 | #define EXT2_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ |
| 1502 | EXT4_FEATURE_INCOMPAT_META_BG) |
| 1503 | #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ |
| 1504 | EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ |
| 1505 | EXT4_FEATURE_RO_COMPAT_BTREE_DIR) |
| 1506 | |
| 1507 | #define EXT3_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR |
| 1508 | #define EXT3_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ |
| 1509 | EXT4_FEATURE_INCOMPAT_RECOVER| \ |
| 1510 | EXT4_FEATURE_INCOMPAT_META_BG) |
| 1511 | #define EXT3_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ |
| 1512 | EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ |
| 1513 | EXT4_FEATURE_RO_COMPAT_BTREE_DIR) |
| 1514 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1515 | #define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR |
| 1516 | #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ |
| 1517 | EXT4_FEATURE_INCOMPAT_RECOVER| \ |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1518 | EXT4_FEATURE_INCOMPAT_META_BG| \ |
Laurent Vivier | bd81d8e | 2006-10-11 01:21:10 -0700 | [diff] [blame] | 1519 | EXT4_FEATURE_INCOMPAT_EXTENTS| \ |
Jose R. Santos | ce42158 | 2007-10-16 18:38:25 -0400 | [diff] [blame] | 1520 | EXT4_FEATURE_INCOMPAT_64BIT| \ |
Johann Lombardi | c5e06d1 | 2011-05-24 18:31:25 -0400 | [diff] [blame] | 1521 | EXT4_FEATURE_INCOMPAT_FLEX_BG| \ |
Tao Ma | f08225d | 2012-12-10 14:06:03 -0500 | [diff] [blame] | 1522 | EXT4_FEATURE_INCOMPAT_MMP | \ |
| 1523 | EXT4_FEATURE_INCOMPAT_INLINE_DATA) |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1524 | #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ |
| 1525 | EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ |
Andreas Dilger | 717d50e | 2007-10-16 18:38:25 -0400 | [diff] [blame] | 1526 | EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \ |
Andreas Dilger | f8628a1 | 2007-07-18 08:38:01 -0400 | [diff] [blame] | 1527 | EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \ |
Kalpak Shah | ef7f383 | 2007-07-18 09:15:20 -0400 | [diff] [blame] | 1528 | EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \ |
Aneesh Kumar K.V | 0fc1b45 | 2008-01-28 23:58:26 -0500 | [diff] [blame] | 1529 | EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\ |
Theodore Ts'o | 6f16b60 | 2011-09-09 19:06:51 -0400 | [diff] [blame] | 1530 | EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\ |
Darrick J. Wong | e93376c | 2012-05-27 08:12:42 -0400 | [diff] [blame] | 1531 | EXT4_FEATURE_RO_COMPAT_BIGALLOC |\ |
Aditya Kali | 7c319d3 | 2012-07-22 20:21:31 -0400 | [diff] [blame] | 1532 | EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\ |
| 1533 | EXT4_FEATURE_RO_COMPAT_QUOTA) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1534 | |
| 1535 | /* |
| 1536 | * Default values for user and/or group using reserved blocks |
| 1537 | */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1538 | #define EXT4_DEF_RESUID 0 |
| 1539 | #define EXT4_DEF_RESGID 0 |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1540 | |
Theodore Ts'o | 240799c | 2008-10-09 23:53:47 -0400 | [diff] [blame] | 1541 | #define EXT4_DEF_INODE_READAHEAD_BLKS 32 |
| 1542 | |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1543 | /* |
| 1544 | * Default mount options |
| 1545 | */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1546 | #define EXT4_DEFM_DEBUG 0x0001 |
| 1547 | #define EXT4_DEFM_BSDGROUPS 0x0002 |
| 1548 | #define EXT4_DEFM_XATTR_USER 0x0004 |
| 1549 | #define EXT4_DEFM_ACL 0x0008 |
| 1550 | #define EXT4_DEFM_UID16 0x0010 |
| 1551 | #define EXT4_DEFM_JMODE 0x0060 |
| 1552 | #define EXT4_DEFM_JMODE_DATA 0x0020 |
| 1553 | #define EXT4_DEFM_JMODE_ORDERED 0x0040 |
| 1554 | #define EXT4_DEFM_JMODE_WBACK 0x0060 |
Theodore Ts'o | 8b67f04 | 2010-08-01 23:14:20 -0400 | [diff] [blame] | 1555 | #define EXT4_DEFM_NOBARRIER 0x0100 |
| 1556 | #define EXT4_DEFM_BLOCK_VALIDITY 0x0200 |
| 1557 | #define EXT4_DEFM_DISCARD 0x0400 |
| 1558 | #define EXT4_DEFM_NODELALLOC 0x0800 |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1559 | |
| 1560 | /* |
Theodore Ts'o | 3077384 | 2009-01-03 20:27:38 -0500 | [diff] [blame] | 1561 | * Default journal batch times |
| 1562 | */ |
| 1563 | #define EXT4_DEF_MIN_BATCH_TIME 0 |
| 1564 | #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */ |
| 1565 | |
| 1566 | /* |
Theodore Ts'o | a491212 | 2009-03-12 12:18:34 -0400 | [diff] [blame] | 1567 | * Minimum number of groups in a flexgroup before we separate out |
| 1568 | * directories into the first block group of a flexgroup |
| 1569 | */ |
| 1570 | #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4 |
| 1571 | |
| 1572 | /* |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1573 | * Structure of a directory entry |
| 1574 | */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1575 | #define EXT4_NAME_LEN 255 |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1576 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1577 | struct ext4_dir_entry { |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1578 | __le32 inode; /* Inode number */ |
| 1579 | __le16 rec_len; /* Directory entry length */ |
| 1580 | __le16 name_len; /* Name length */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1581 | char name[EXT4_NAME_LEN]; /* File name */ |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1582 | }; |
| 1583 | |
| 1584 | /* |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1585 | * The new version of the directory entry. Since EXT4 structures are |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1586 | * stored in intel byte order, and the name_len field could never be |
| 1587 | * bigger than 255 chars, it's safe to reclaim the extra byte for the |
| 1588 | * file_type field. |
| 1589 | */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1590 | struct ext4_dir_entry_2 { |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1591 | __le32 inode; /* Inode number */ |
| 1592 | __le16 rec_len; /* Directory entry length */ |
| 1593 | __u8 name_len; /* Name length */ |
| 1594 | __u8 file_type; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1595 | char name[EXT4_NAME_LEN]; /* File name */ |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1596 | }; |
| 1597 | |
| 1598 | /* |
Darrick J. Wong | e615391 | 2012-04-29 18:23:10 -0400 | [diff] [blame] | 1599 | * This is a bogus directory entry at the end of each leaf block that |
| 1600 | * records checksums. |
| 1601 | */ |
| 1602 | struct ext4_dir_entry_tail { |
| 1603 | __le32 det_reserved_zero1; /* Pretend to be unused */ |
| 1604 | __le16 det_rec_len; /* 12 */ |
| 1605 | __u8 det_reserved_zero2; /* Zero name length */ |
| 1606 | __u8 det_reserved_ft; /* 0xDE, fake file type */ |
| 1607 | __le32 det_checksum; /* crc32c(uuid+inum+dirblock) */ |
| 1608 | }; |
| 1609 | |
Tao Ma | 3c47d54 | 2012-12-10 14:05:59 -0500 | [diff] [blame] | 1610 | #define EXT4_DIRENT_TAIL(block, blocksize) \ |
| 1611 | ((struct ext4_dir_entry_tail *)(((void *)(block)) + \ |
| 1612 | ((blocksize) - \ |
| 1613 | sizeof(struct ext4_dir_entry_tail)))) |
| 1614 | |
Darrick J. Wong | e615391 | 2012-04-29 18:23:10 -0400 | [diff] [blame] | 1615 | /* |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1616 | * Ext4 directory file types. Only the low 3 bits are used. The |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1617 | * other bits are reserved for now. |
| 1618 | */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1619 | #define EXT4_FT_UNKNOWN 0 |
| 1620 | #define EXT4_FT_REG_FILE 1 |
| 1621 | #define EXT4_FT_DIR 2 |
| 1622 | #define EXT4_FT_CHRDEV 3 |
| 1623 | #define EXT4_FT_BLKDEV 4 |
| 1624 | #define EXT4_FT_FIFO 5 |
| 1625 | #define EXT4_FT_SOCK 6 |
| 1626 | #define EXT4_FT_SYMLINK 7 |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1627 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1628 | #define EXT4_FT_MAX 8 |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1629 | |
Darrick J. Wong | e615391 | 2012-04-29 18:23:10 -0400 | [diff] [blame] | 1630 | #define EXT4_FT_DIR_CSUM 0xDE |
| 1631 | |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1632 | /* |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1633 | * EXT4_DIR_PAD defines the directory entries boundaries |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1634 | * |
| 1635 | * NOTE: It must be a multiple of 4 |
| 1636 | */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1637 | #define EXT4_DIR_PAD 4 |
| 1638 | #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1) |
| 1639 | #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \ |
| 1640 | ~EXT4_DIR_ROUND) |
Jan Kara | a72d7f8 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 1641 | #define EXT4_MAX_REC_LEN ((1<<16)-1) |
| 1642 | |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1643 | /* |
Eric Sandeen | 0cfc925 | 2010-08-05 01:46:37 -0400 | [diff] [blame] | 1644 | * If we ever get support for fs block sizes > page_size, we'll need |
| 1645 | * to remove the #if statements in the next two functions... |
| 1646 | */ |
| 1647 | static inline unsigned int |
| 1648 | ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize) |
| 1649 | { |
| 1650 | unsigned len = le16_to_cpu(dlen); |
| 1651 | |
| 1652 | #if (PAGE_CACHE_SIZE >= 65536) |
| 1653 | if (len == EXT4_MAX_REC_LEN || len == 0) |
| 1654 | return blocksize; |
| 1655 | return (len & 65532) | ((len & 3) << 16); |
| 1656 | #else |
| 1657 | return len; |
| 1658 | #endif |
| 1659 | } |
| 1660 | |
| 1661 | static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize) |
| 1662 | { |
| 1663 | if ((len > blocksize) || (blocksize > (1 << 18)) || (len & 3)) |
| 1664 | BUG(); |
| 1665 | #if (PAGE_CACHE_SIZE >= 65536) |
| 1666 | if (len < 65536) |
| 1667 | return cpu_to_le16(len); |
| 1668 | if (len == blocksize) { |
| 1669 | if (blocksize == 65536) |
| 1670 | return cpu_to_le16(EXT4_MAX_REC_LEN); |
| 1671 | else |
| 1672 | return cpu_to_le16(0); |
| 1673 | } |
| 1674 | return cpu_to_le16((len & 65532) | ((len >> 16) & 3)); |
| 1675 | #else |
| 1676 | return cpu_to_le16(len); |
| 1677 | #endif |
| 1678 | } |
| 1679 | |
| 1680 | /* |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1681 | * Hash Tree Directory indexing |
| 1682 | * (c) Daniel Phillips, 2001 |
| 1683 | */ |
| 1684 | |
Eric Sandeen | 4074fe3 | 2007-10-16 18:38:25 -0400 | [diff] [blame] | 1685 | #define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \ |
| 1686 | EXT4_FEATURE_COMPAT_DIR_INDEX) && \ |
Dmitry Monakhov | 12e9b89 | 2010-05-16 22:00:00 -0400 | [diff] [blame] | 1687 | ext4_test_inode_flag((dir), EXT4_INODE_INDEX)) |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1688 | #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX) |
| 1689 | #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] | 1690 | |
| 1691 | /* Legal values for the dx_root hash_version field: */ |
| 1692 | |
| 1693 | #define DX_HASH_LEGACY 0 |
| 1694 | #define DX_HASH_HALF_MD4 1 |
| 1695 | #define DX_HASH_TEA 2 |
Theodore Ts'o | f99b258 | 2008-10-28 13:21:44 -0400 | [diff] [blame] | 1696 | #define DX_HASH_LEGACY_UNSIGNED 3 |
| 1697 | #define DX_HASH_HALF_MD4_UNSIGNED 4 |
| 1698 | #define DX_HASH_TEA_UNSIGNED 5 |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1699 | |
Darrick J. Wong | 0441984 | 2012-04-29 18:27:10 -0400 | [diff] [blame] | 1700 | static inline u32 ext4_chksum(struct ext4_sb_info *sbi, u32 crc, |
| 1701 | const void *address, unsigned int length) |
| 1702 | { |
| 1703 | struct { |
| 1704 | struct shash_desc shash; |
Theodore Ts'o | 3108b54 | 2012-07-22 20:25:31 -0400 | [diff] [blame] | 1705 | char ctx[4]; |
Darrick J. Wong | 0441984 | 2012-04-29 18:27:10 -0400 | [diff] [blame] | 1706 | } desc; |
| 1707 | int err; |
| 1708 | |
Theodore Ts'o | 3108b54 | 2012-07-22 20:25:31 -0400 | [diff] [blame] | 1709 | BUG_ON(crypto_shash_descsize(sbi->s_chksum_driver)!=sizeof(desc.ctx)); |
| 1710 | |
Darrick J. Wong | 0441984 | 2012-04-29 18:27:10 -0400 | [diff] [blame] | 1711 | desc.shash.tfm = sbi->s_chksum_driver; |
| 1712 | desc.shash.flags = 0; |
| 1713 | *(u32 *)desc.ctx = crc; |
| 1714 | |
| 1715 | err = crypto_shash_update(&desc.shash, address, length); |
| 1716 | BUG_ON(err); |
| 1717 | |
| 1718 | return *(u32 *)desc.ctx; |
| 1719 | } |
| 1720 | |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1721 | #ifdef __KERNEL__ |
| 1722 | |
| 1723 | /* hash info structure used by the directory hash */ |
| 1724 | struct dx_hash_info |
| 1725 | { |
| 1726 | u32 hash; |
| 1727 | u32 minor_hash; |
| 1728 | int hash_version; |
| 1729 | u32 *seed; |
| 1730 | }; |
| 1731 | |
Fan Yong | d1f5273 | 2012-03-18 22:44:40 -0400 | [diff] [blame] | 1732 | |
| 1733 | /* 32 and 64 bit signed EOF for dx directories */ |
| 1734 | #define EXT4_HTREE_EOF_32BIT ((1UL << (32 - 1)) - 1) |
| 1735 | #define EXT4_HTREE_EOF_64BIT ((1ULL << (64 - 1)) - 1) |
| 1736 | |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1737 | |
| 1738 | /* |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1739 | * Control parameters used by ext4_htree_next_block |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1740 | */ |
| 1741 | #define HASH_NB_ALWAYS 1 |
| 1742 | |
| 1743 | |
| 1744 | /* |
| 1745 | * Describe an inode's exact location on disk and in memory |
| 1746 | */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1747 | struct ext4_iloc |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1748 | { |
| 1749 | struct buffer_head *bh; |
| 1750 | unsigned long offset; |
Avantika Mathur | fd2d429 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 1751 | ext4_group_t block_group; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1752 | }; |
| 1753 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1754 | static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1755 | { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1756 | return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1757 | } |
| 1758 | |
| 1759 | /* |
| 1760 | * This structure is stuffed into the struct file's private_data field |
| 1761 | * for directories. It is where we put information so that we can do |
| 1762 | * readdir operations in hash tree order. |
| 1763 | */ |
| 1764 | struct dir_private_info { |
| 1765 | struct rb_root root; |
| 1766 | struct rb_node *curr_node; |
| 1767 | struct fname *extra_fname; |
| 1768 | loff_t last_pos; |
| 1769 | __u32 curr_hash; |
| 1770 | __u32 curr_minor_hash; |
| 1771 | __u32 next_hash; |
| 1772 | }; |
| 1773 | |
| 1774 | /* calculate the first block number of the group */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1775 | static inline ext4_fsblk_t |
Avantika Mathur | fd2d429 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 1776 | ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1777 | { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1778 | return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) + |
| 1779 | le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1780 | } |
| 1781 | |
| 1782 | /* |
| 1783 | * Special error return code only used by dx_probe() and its callers. |
| 1784 | */ |
| 1785 | #define ERR_BAD_DX_DIR -75000 |
| 1786 | |
Andrew Morton | 72b64b5 | 2006-10-11 01:21:18 -0700 | [diff] [blame] | 1787 | void ext4_get_group_no_and_offset(struct super_block *sb, ext4_fsblk_t blocknr, |
Theodore Ts'o | a9df9a4 | 2009-01-05 22:18:16 -0500 | [diff] [blame] | 1788 | ext4_group_t *blockgrpp, ext4_grpblk_t *offsetp); |
Mingming Cao | 3a5b2ec | 2006-10-11 01:21:05 -0700 | [diff] [blame] | 1789 | |
| 1790 | /* |
Lukas Czerner | bfff687 | 2010-10-27 21:30:05 -0400 | [diff] [blame] | 1791 | * Timeout and state flag for lazy initialization inode thread. |
| 1792 | */ |
| 1793 | #define EXT4_DEF_LI_WAIT_MULT 10 |
| 1794 | #define EXT4_DEF_LI_MAX_START_DELAY 5 |
| 1795 | #define EXT4_LAZYINIT_QUIT 0x0001 |
| 1796 | #define EXT4_LAZYINIT_RUNNING 0x0002 |
| 1797 | |
| 1798 | /* |
| 1799 | * Lazy inode table initialization info |
| 1800 | */ |
| 1801 | struct ext4_lazy_init { |
| 1802 | unsigned long li_state; |
Lukas Czerner | bfff687 | 2010-10-27 21:30:05 -0400 | [diff] [blame] | 1803 | struct list_head li_request_list; |
| 1804 | struct mutex li_list_mtx; |
| 1805 | }; |
| 1806 | |
| 1807 | struct ext4_li_request { |
| 1808 | struct super_block *lr_super; |
| 1809 | struct ext4_sb_info *lr_sbi; |
| 1810 | ext4_group_t lr_next_group; |
| 1811 | struct list_head lr_request; |
| 1812 | unsigned long lr_next_sched; |
| 1813 | unsigned long lr_timeout; |
| 1814 | }; |
| 1815 | |
Lukas Czerner | 857ac88 | 2010-10-27 21:30:05 -0400 | [diff] [blame] | 1816 | struct ext4_features { |
| 1817 | struct kobject f_kobj; |
| 1818 | struct completion f_kobj_unregister; |
| 1819 | }; |
| 1820 | |
Lukas Czerner | bfff687 | 2010-10-27 21:30:05 -0400 | [diff] [blame] | 1821 | /* |
Johann Lombardi | c5e06d1 | 2011-05-24 18:31:25 -0400 | [diff] [blame] | 1822 | * This structure will be used for multiple mount protection. It will be |
| 1823 | * written into the block number saved in the s_mmp_block field in the |
| 1824 | * superblock. Programs that check MMP should assume that if |
| 1825 | * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe |
| 1826 | * to use the filesystem, regardless of how old the timestamp is. |
| 1827 | */ |
| 1828 | #define EXT4_MMP_MAGIC 0x004D4D50U /* ASCII for MMP */ |
| 1829 | #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */ |
| 1830 | #define EXT4_MMP_SEQ_FSCK 0xE24D4D50U /* mmp_seq value when being fscked */ |
| 1831 | #define EXT4_MMP_SEQ_MAX 0xE24D4D4FU /* maximum valid mmp_seq value */ |
| 1832 | |
| 1833 | struct mmp_struct { |
| 1834 | __le32 mmp_magic; /* Magic number for MMP */ |
| 1835 | __le32 mmp_seq; /* Sequence no. updated periodically */ |
| 1836 | |
| 1837 | /* |
| 1838 | * mmp_time, mmp_nodename & mmp_bdevname are only used for information |
| 1839 | * purposes and do not affect the correctness of the algorithm |
| 1840 | */ |
| 1841 | __le64 mmp_time; /* Time last updated */ |
| 1842 | char mmp_nodename[64]; /* Node which last updated MMP block */ |
| 1843 | char mmp_bdevname[32]; /* Bdev which last updated MMP block */ |
| 1844 | |
| 1845 | /* |
| 1846 | * mmp_check_interval is used to verify if the MMP block has been |
| 1847 | * updated on the block device. The value is updated based on the |
| 1848 | * maximum time to write the MMP block during an update cycle. |
| 1849 | */ |
| 1850 | __le16 mmp_check_interval; |
| 1851 | |
| 1852 | __le16 mmp_pad1; |
Darrick J. Wong | e615391 | 2012-04-29 18:23:10 -0400 | [diff] [blame] | 1853 | __le32 mmp_pad2[226]; |
| 1854 | __le32 mmp_checksum; /* crc32c(uuid+mmp_block) */ |
Johann Lombardi | c5e06d1 | 2011-05-24 18:31:25 -0400 | [diff] [blame] | 1855 | }; |
| 1856 | |
| 1857 | /* arguments passed to the mmp thread */ |
| 1858 | struct mmpd_data { |
| 1859 | struct buffer_head *bh; /* bh from initial read_mmp_block() */ |
| 1860 | struct super_block *sb; /* super block of the fs */ |
| 1861 | }; |
| 1862 | |
| 1863 | /* |
| 1864 | * Check interval multiplier |
| 1865 | * The MMP block is written every update interval and initially checked every |
| 1866 | * update interval x the multiplier (the value is then adapted based on the |
| 1867 | * write latency). The reason is that writes can be delayed under load and we |
| 1868 | * don't want readers to incorrectly assume that the filesystem is no longer |
| 1869 | * in use. |
| 1870 | */ |
| 1871 | #define EXT4_MMP_CHECK_MULT 2UL |
| 1872 | |
| 1873 | /* |
| 1874 | * Minimum interval for MMP checking in seconds. |
| 1875 | */ |
| 1876 | #define EXT4_MMP_MIN_CHECK_INTERVAL 5UL |
| 1877 | |
| 1878 | /* |
| 1879 | * Maximum interval for MMP checking in seconds. |
| 1880 | */ |
| 1881 | #define EXT4_MMP_MAX_CHECK_INTERVAL 300UL |
| 1882 | |
| 1883 | /* |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1884 | * Function prototypes |
| 1885 | */ |
| 1886 | |
| 1887 | /* |
| 1888 | * 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] | 1889 | * ext4 source programs needs to include it so they are duplicated here. |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1890 | */ |
Dave Kleikamp | 8c55e20 | 2007-05-24 13:04:54 -0400 | [diff] [blame] | 1891 | # define NORET_TYPE /**/ |
| 1892 | # define ATTRIB_NORET __attribute__((noreturn)) |
| 1893 | # define NORET_AND noreturn, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1894 | |
Theodore Ts'o | 498e5f2 | 2008-11-05 00:14:04 -0500 | [diff] [blame] | 1895 | /* bitmap.c */ |
Theodore Ts'o | f6fb99c | 2012-06-30 19:14:57 -0400 | [diff] [blame] | 1896 | extern unsigned int ext4_count_free(char *bitmap, unsigned numchars); |
Darrick J. Wong | 41a246d | 2012-04-29 18:33:10 -0400 | [diff] [blame] | 1897 | void ext4_inode_bitmap_csum_set(struct super_block *sb, ext4_group_t group, |
| 1898 | struct ext4_group_desc *gdp, |
| 1899 | struct buffer_head *bh, int sz); |
| 1900 | int ext4_inode_bitmap_csum_verify(struct super_block *sb, ext4_group_t group, |
| 1901 | struct ext4_group_desc *gdp, |
| 1902 | struct buffer_head *bh, int sz); |
Darrick J. Wong | fa77dcf | 2012-04-29 18:35:10 -0400 | [diff] [blame] | 1903 | void ext4_block_bitmap_csum_set(struct super_block *sb, ext4_group_t group, |
| 1904 | struct ext4_group_desc *gdp, |
Tao Ma | 79f1ba4 | 2012-10-22 00:34:32 -0400 | [diff] [blame] | 1905 | struct buffer_head *bh); |
Darrick J. Wong | fa77dcf | 2012-04-29 18:35:10 -0400 | [diff] [blame] | 1906 | int ext4_block_bitmap_csum_verify(struct super_block *sb, ext4_group_t group, |
| 1907 | struct ext4_group_desc *gdp, |
Tao Ma | 79f1ba4 | 2012-10-22 00:34:32 -0400 | [diff] [blame] | 1908 | struct buffer_head *bh); |
Theodore Ts'o | 498e5f2 | 2008-11-05 00:14:04 -0500 | [diff] [blame] | 1909 | |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1910 | /* balloc.c */ |
Darrick J. Wong | fa77dcf | 2012-04-29 18:35:10 -0400 | [diff] [blame] | 1911 | extern void ext4_validate_block_bitmap(struct super_block *sb, |
| 1912 | struct ext4_group_desc *desc, |
| 1913 | unsigned int block_group, |
| 1914 | struct buffer_head *bh); |
Mingming Cao | 3a5b2ec | 2006-10-11 01:21:05 -0700 | [diff] [blame] | 1915 | extern unsigned int ext4_block_group(struct super_block *sb, |
| 1916 | ext4_fsblk_t blocknr); |
| 1917 | extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb, |
| 1918 | ext4_fsblk_t blocknr); |
Avantika Mathur | fd2d429 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 1919 | extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group); |
| 1920 | extern unsigned long ext4_bg_num_gdb(struct super_block *sb, |
| 1921 | ext4_group_t group); |
Aneesh Kumar K.V | 7061eba | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 1922 | extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode, |
Allison Henderson | 55f020d | 2011-05-25 07:41:26 -0400 | [diff] [blame] | 1923 | ext4_fsblk_t goal, |
| 1924 | unsigned int flags, |
| 1925 | unsigned long *count, |
| 1926 | int *errp); |
Theodore Ts'o | e7d5f31 | 2011-09-09 19:14:51 -0400 | [diff] [blame] | 1927 | extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi, |
| 1928 | s64 nclusters, unsigned int flags); |
Theodore Ts'o | 5dee543 | 2011-09-09 19:10:51 -0400 | [diff] [blame] | 1929 | extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *); |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 1930 | extern void ext4_check_blocks_bitmap(struct super_block *); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1931 | extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb, |
Avantika Mathur | fd2d429 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 1932 | ext4_group_t block_group, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1933 | struct buffer_head ** bh); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1934 | extern int ext4_should_retry_alloc(struct super_block *sb, int *retries); |
Theodore Ts'o | 813e572 | 2012-02-20 17:52:46 -0500 | [diff] [blame] | 1935 | |
| 1936 | extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb, |
| 1937 | ext4_group_t block_group); |
| 1938 | extern int ext4_wait_block_bitmap(struct super_block *sb, |
| 1939 | ext4_group_t block_group, |
| 1940 | struct buffer_head *bh); |
| 1941 | extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb, |
| 1942 | ext4_group_t block_group); |
Theodore Ts'o | fd034a8 | 2011-09-09 18:42:51 -0400 | [diff] [blame] | 1943 | extern void ext4_init_block_bitmap(struct super_block *sb, |
| 1944 | struct buffer_head *bh, |
| 1945 | ext4_group_t group, |
| 1946 | struct ext4_group_desc *desc); |
Theodore Ts'o | cff1dfd7 | 2011-09-09 19:12:51 -0400 | [diff] [blame] | 1947 | extern unsigned ext4_free_clusters_after_init(struct super_block *sb, |
| 1948 | ext4_group_t block_group, |
| 1949 | struct ext4_group_desc *gdp); |
Theodore Ts'o | d5b8f31 | 2011-09-09 18:44:51 -0400 | [diff] [blame] | 1950 | extern unsigned ext4_num_overhead_clusters(struct super_block *sb, |
| 1951 | ext4_group_t block_group, |
| 1952 | struct ext4_group_desc *gdp); |
Eric Sandeen | f86186b | 2011-06-28 10:01:31 -0400 | [diff] [blame] | 1953 | ext4_fsblk_t ext4_inode_to_goal_block(struct inode *); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1954 | |
| 1955 | /* dir.c */ |
Theodore Ts'o | 60fd4da | 2010-07-27 11:54:40 -0400 | [diff] [blame] | 1956 | extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *, |
Theodore Ts'o | f7c2117 | 2011-01-10 12:10:55 -0500 | [diff] [blame] | 1957 | struct file *, |
Theodore Ts'o | 60fd4da | 2010-07-27 11:54:40 -0400 | [diff] [blame] | 1958 | struct ext4_dir_entry_2 *, |
Tao Ma | 226ba97 | 2012-12-10 14:05:58 -0500 | [diff] [blame] | 1959 | struct buffer_head *, char *, int, |
| 1960 | unsigned int); |
| 1961 | #define ext4_check_dir_entry(dir, filp, de, bh, buf, size, offset) \ |
Theodore Ts'o | f7c2117 | 2011-01-10 12:10:55 -0500 | [diff] [blame] | 1962 | unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \ |
Tao Ma | 226ba97 | 2012-12-10 14:05:58 -0500 | [diff] [blame] | 1963 | (de), (bh), (buf), (size), (offset))) |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1964 | extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1965 | __u32 minor_hash, |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1966 | struct ext4_dir_entry_2 *dirent); |
| 1967 | extern void ext4_htree_free_dir_info(struct dir_private_info *p); |
Tao Ma | 978fef9 | 2012-12-10 14:05:58 -0500 | [diff] [blame] | 1968 | extern int ext4_find_dest_de(struct inode *dir, struct inode *inode, |
| 1969 | struct buffer_head *bh, |
| 1970 | void *buf, int buf_size, |
| 1971 | const char *name, int namelen, |
| 1972 | struct ext4_dir_entry_2 **dest_de); |
| 1973 | void ext4_insert_dentry(struct inode *inode, |
| 1974 | struct ext4_dir_entry_2 *de, |
| 1975 | int buf_size, |
| 1976 | const char *name, int namelen); |
| 1977 | static inline void ext4_update_dx_flag(struct inode *inode) |
| 1978 | { |
| 1979 | if (!EXT4_HAS_COMPAT_FEATURE(inode->i_sb, |
| 1980 | EXT4_FEATURE_COMPAT_DIR_INDEX)) |
| 1981 | ext4_clear_inode_flag(inode, EXT4_INODE_INDEX); |
| 1982 | } |
Tao Ma | 65d165d | 2012-12-10 14:05:59 -0500 | [diff] [blame] | 1983 | static unsigned char ext4_filetype_table[] = { |
| 1984 | DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK |
| 1985 | }; |
| 1986 | |
| 1987 | static inline unsigned char get_dtype(struct super_block *sb, int filetype) |
| 1988 | { |
| 1989 | if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FILETYPE) || |
| 1990 | (filetype >= EXT4_FT_MAX)) |
| 1991 | return DT_UNKNOWN; |
| 1992 | |
| 1993 | return ext4_filetype_table[filetype]; |
| 1994 | } |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1995 | |
| 1996 | /* fsync.c */ |
Josef Bacik | 02c24a8 | 2011-07-16 20:44:56 -0400 | [diff] [blame] | 1997 | extern int ext4_sync_file(struct file *, loff_t, loff_t, int); |
Dmitry Monakhov | c278531 | 2012-10-05 11:31:55 -0400 | [diff] [blame] | 1998 | extern int ext4_flush_unwritten_io(struct inode *); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1999 | |
| 2000 | /* hash.c */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2001 | extern int ext4fs_dirhash(const char *name, int len, struct |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2002 | dx_hash_info *hinfo); |
| 2003 | |
| 2004 | /* ialloc.c */ |
Theodore Ts'o | 1139575 | 2013-02-09 16:27:09 -0500 | [diff] [blame] | 2005 | extern struct inode *__ext4_new_inode(handle_t *, struct inode *, umode_t, |
| 2006 | const struct qstr *qstr, __u32 goal, |
| 2007 | uid_t *owner, int handle_type, |
| 2008 | unsigned int line_no, int nblocks); |
| 2009 | |
| 2010 | #define ext4_new_inode(handle, dir, mode, qstr, goal, owner) \ |
| 2011 | __ext4_new_inode((handle), (dir), (mode), (qstr), (goal), (owner), \ |
| 2012 | 0, 0, 0) |
| 2013 | #define ext4_new_inode_start_handle(dir, mode, qstr, goal, owner, \ |
| 2014 | type, nblocks) \ |
| 2015 | __ext4_new_inode(NULL, (dir), (mode), (qstr), (goal), (owner), \ |
| 2016 | (type), __LINE__, (nblocks)) |
| 2017 | |
| 2018 | |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 2019 | extern void ext4_free_inode(handle_t *, struct inode *); |
| 2020 | extern struct inode * ext4_orphan_get(struct super_block *, unsigned long); |
| 2021 | extern unsigned long ext4_count_free_inodes(struct super_block *); |
| 2022 | extern unsigned long ext4_count_dirs(struct super_block *); |
| 2023 | extern void ext4_check_inodes_bitmap(struct super_block *); |
Theodore Ts'o | 61d0867 | 2010-10-27 21:30:15 -0400 | [diff] [blame] | 2024 | extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap); |
Lukas Czerner | bfff687 | 2010-10-27 21:30:05 -0400 | [diff] [blame] | 2025 | extern int ext4_init_inode_table(struct super_block *sb, |
| 2026 | ext4_group_t group, int barrier); |
Theodore Ts'o | 813e572 | 2012-02-20 17:52:46 -0500 | [diff] [blame] | 2027 | extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2028 | |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 2029 | /* mballoc.c */ |
| 2030 | extern long ext4_mb_stats; |
| 2031 | extern long ext4_mb_max_to_scan; |
Akira Fujita | 9d99012 | 2012-05-28 14:19:25 -0400 | [diff] [blame] | 2032 | extern int ext4_mb_init(struct super_block *); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 2033 | extern int ext4_mb_release(struct super_block *); |
| 2034 | extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *, |
| 2035 | struct ext4_allocation_request *, int *); |
| 2036 | extern int ext4_mb_reserve_blocks(struct super_block *, int); |
Theodore Ts'o | c2ea3fd | 2008-10-10 09:40:52 -0400 | [diff] [blame] | 2037 | extern void ext4_discard_preallocations(struct inode *); |
Theodore Ts'o | 5dabfc7 | 2010-10-27 21:30:14 -0400 | [diff] [blame] | 2038 | extern int __init ext4_init_mballoc(void); |
| 2039 | extern void ext4_exit_mballoc(void); |
Theodore Ts'o | 4433871 | 2009-11-22 07:44:56 -0500 | [diff] [blame] | 2040 | extern void ext4_free_blocks(handle_t *handle, struct inode *inode, |
Theodore Ts'o | e636260 | 2009-11-23 07:17:05 -0500 | [diff] [blame] | 2041 | struct buffer_head *bh, ext4_fsblk_t block, |
| 2042 | unsigned long count, int flags); |
Theodore Ts'o | 28623c2 | 2012-09-05 01:31:50 -0400 | [diff] [blame] | 2043 | extern int ext4_mb_alloc_groupinfo(struct super_block *sb, |
| 2044 | ext4_group_t ngroups); |
Aneesh Kumar K.V | 920313a | 2009-01-05 21:36:19 -0500 | [diff] [blame] | 2045 | extern int ext4_mb_add_groupinfo(struct super_block *sb, |
Frederic Bohe | 5f21b0e | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 2046 | ext4_group_t i, struct ext4_group_desc *desc); |
Yongqiang Yang | cc7365d | 2011-07-26 21:46:07 -0400 | [diff] [blame] | 2047 | extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb, |
Amir Goldstein | 2846e82 | 2011-05-09 10:46:41 -0400 | [diff] [blame] | 2048 | ext4_fsblk_t block, unsigned long count); |
Lukas Czerner | 7360d17 | 2010-10-27 21:30:12 -0400 | [diff] [blame] | 2049 | extern int ext4_trim_fs(struct super_block *, struct fstrim_range *); |
| 2050 | |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2051 | /* inode.c */ |
Aneesh Kumar K.V | 725d26d | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 2052 | struct buffer_head *ext4_getblk(handle_t *, struct inode *, |
| 2053 | ext4_lblk_t, int, int *); |
| 2054 | struct buffer_head *ext4_bread(handle_t *, struct inode *, |
| 2055 | ext4_lblk_t, int, int *); |
Tao Ma | f19d587 | 2012-12-10 14:05:51 -0500 | [diff] [blame] | 2056 | int ext4_get_block_write(struct inode *inode, sector_t iblock, |
| 2057 | struct buffer_head *bh_result, int create); |
Eric Sandeen | 6873fa0 | 2008-10-07 00:46:36 -0400 | [diff] [blame] | 2058 | int ext4_get_block(struct inode *inode, sector_t iblock, |
| 2059 | struct buffer_head *bh_result, int create); |
Tao Ma | 9c3569b | 2012-12-10 14:05:57 -0500 | [diff] [blame] | 2060 | int ext4_da_get_block_prep(struct inode *inode, sector_t iblock, |
| 2061 | struct buffer_head *bh, int create); |
Tao Ma | f19d587 | 2012-12-10 14:05:51 -0500 | [diff] [blame] | 2062 | int ext4_walk_page_buffers(handle_t *handle, |
| 2063 | struct buffer_head *head, |
| 2064 | unsigned from, |
| 2065 | unsigned to, |
| 2066 | int *partial, |
| 2067 | int (*fn)(handle_t *handle, |
| 2068 | struct buffer_head *bh)); |
| 2069 | int do_journal_get_write_access(handle_t *handle, |
| 2070 | struct buffer_head *bh); |
Tao Ma | 9c3569b | 2012-12-10 14:05:57 -0500 | [diff] [blame] | 2071 | #define FALL_BACK_TO_NONDELALLOC 1 |
| 2072 | #define CONVERT_INLINE_DATA 2 |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2073 | |
David Howells | 1d1fe1e | 2008-02-07 00:15:37 -0800 | [diff] [blame] | 2074 | extern struct inode *ext4_iget(struct super_block *, unsigned long); |
Christoph Hellwig | a9185b4 | 2010-03-05 09:21:37 +0100 | [diff] [blame] | 2075 | extern int ext4_write_inode(struct inode *, struct writeback_control *); |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 2076 | extern int ext4_setattr(struct dentry *, struct iattr *); |
Mingming Cao | 3e3398a | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 2077 | extern int ext4_getattr(struct vfsmount *mnt, struct dentry *dentry, |
| 2078 | struct kstat *stat); |
Al Viro | 0930fcc | 2010-06-07 13:16:22 -0400 | [diff] [blame] | 2079 | extern void ext4_evict_inode(struct inode *); |
| 2080 | extern void ext4_clear_inode(struct inode *); |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 2081 | extern int ext4_sync_inode(handle_t *, struct inode *); |
Christoph Hellwig | aa38572 | 2011-05-27 06:53:02 -0400 | [diff] [blame] | 2082 | extern void ext4_dirty_inode(struct inode *, int); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2083 | extern int ext4_change_inode_journal_flag(struct inode *, int); |
| 2084 | extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *); |
Duane Griffin | 91ef4ca | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 2085 | extern int ext4_can_truncate(struct inode *inode); |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 2086 | extern void ext4_truncate(struct inode *); |
Allison Henderson | a4bb6b6 | 2011-05-25 07:41:50 -0400 | [diff] [blame] | 2087 | extern int ext4_punch_hole(struct file *file, loff_t offset, loff_t length); |
Jan Kara | 487caee | 2009-08-17 22:17:20 -0400 | [diff] [blame] | 2088 | extern int ext4_truncate_restart_trans(handle_t *, struct inode *, int nblocks); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2089 | extern void ext4_set_inode_flags(struct inode *); |
Jan Kara | ff9ddf7 | 2007-07-18 09:24:20 -0400 | [diff] [blame] | 2090 | extern void ext4_get_inode_flags(struct ext4_inode_info *); |
Theodore Ts'o | ccd2506 | 2009-02-26 01:04:07 -0500 | [diff] [blame] | 2091 | extern int ext4_alloc_da_blocks(struct inode *inode); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2092 | extern void ext4_set_aops(struct inode *inode); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2093 | extern int ext4_writepage_trans_blocks(struct inode *); |
Mingming Cao | f3bd1f3 | 2008-08-19 22:16:03 -0400 | [diff] [blame] | 2094 | extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks); |
Allison Henderson | 4e96b2d | 2011-09-03 11:51:09 -0400 | [diff] [blame] | 2095 | extern int ext4_discard_partial_page_buffers(handle_t *handle, |
| 2096 | struct address_space *mapping, loff_t from, |
| 2097 | loff_t length, int flags); |
Nick Piggin | c2ec175 | 2009-03-31 15:23:21 -0700 | [diff] [blame] | 2098 | extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf); |
Dmitry Monakhov | a9e7f44 | 2009-12-14 15:21:14 +0300 | [diff] [blame] | 2099 | extern qsize_t *ext4_get_reserved_space(struct inode *inode); |
Aneesh Kumar K.V | 5f634d0 | 2010-01-25 04:00:31 -0500 | [diff] [blame] | 2100 | extern void ext4_da_update_reserve_space(struct inode *inode, |
| 2101 | int used, int quota_claim); |
Amir Goldstein | dae1e52 | 2011-06-27 19:40:50 -0400 | [diff] [blame] | 2102 | |
| 2103 | /* indirect.c */ |
| 2104 | extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode, |
| 2105 | struct ext4_map_blocks *map, int flags); |
| 2106 | extern ssize_t ext4_ind_direct_IO(int rw, struct kiocb *iocb, |
| 2107 | const struct iovec *iov, loff_t offset, |
| 2108 | unsigned long nr_segs); |
| 2109 | extern int ext4_ind_calc_metadata_amount(struct inode *inode, sector_t lblock); |
| 2110 | extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks, int chunk); |
Amir Goldstein | ff9893d | 2011-06-27 16:36:31 -0400 | [diff] [blame] | 2111 | extern void ext4_ind_truncate(struct inode *inode); |
Zheng Liu | 8bad6fc | 2013-01-28 09:21:37 -0500 | [diff] [blame] | 2112 | extern int ext4_ind_punch_hole(struct file *file, loff_t offset, loff_t length); |
Amir Goldstein | ff9893d | 2011-06-27 16:36:31 -0400 | [diff] [blame] | 2113 | |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2114 | /* ioctl.c */ |
Andi Kleen | 5cdd7b2 | 2008-04-29 22:03:54 -0400 | [diff] [blame] | 2115 | extern long ext4_ioctl(struct file *, unsigned int, unsigned long); |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 2116 | extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2117 | |
Aneesh Kumar K.V | c14c6fd | 2008-01-28 23:58:26 -0500 | [diff] [blame] | 2118 | /* migrate.c */ |
Aneesh Kumar K.V | 2a43a87 | 2008-09-13 12:52:26 -0400 | [diff] [blame] | 2119 | extern int ext4_ext_migrate(struct inode *); |
Wei Yongjun | 3d0518f | 2009-02-14 23:01:36 -0500 | [diff] [blame] | 2120 | |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2121 | /* namei.c */ |
Darrick J. Wong | b0336e8 | 2012-04-29 18:41:10 -0400 | [diff] [blame] | 2122 | extern int ext4_dirent_csum_verify(struct inode *inode, |
| 2123 | struct ext4_dir_entry *dirent); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2124 | extern int ext4_orphan_add(handle_t *, struct inode *); |
| 2125 | extern int ext4_orphan_del(handle_t *, struct inode *); |
| 2126 | 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] | 2127 | __u32 start_minor_hash, __u32 *next_hash); |
Tao Ma | 7335cd3 | 2012-12-10 14:05:59 -0500 | [diff] [blame] | 2128 | extern int search_dir(struct buffer_head *bh, |
| 2129 | char *search_buf, |
| 2130 | int buf_size, |
| 2131 | struct inode *dir, |
| 2132 | const struct qstr *d_name, |
| 2133 | unsigned int offset, |
| 2134 | struct ext4_dir_entry_2 **res_dir); |
Tao Ma | 05019a9 | 2012-12-10 14:06:00 -0500 | [diff] [blame] | 2135 | extern int ext4_generic_delete_entry(handle_t *handle, |
| 2136 | struct inode *dir, |
| 2137 | struct ext4_dir_entry_2 *de_del, |
| 2138 | struct buffer_head *bh, |
| 2139 | void *entry_buf, |
| 2140 | int buf_size, |
| 2141 | int csum_size); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2142 | |
| 2143 | /* resize.c */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2144 | extern int ext4_group_add(struct super_block *sb, |
| 2145 | struct ext4_new_group_data *input); |
| 2146 | extern int ext4_group_extend(struct super_block *sb, |
| 2147 | struct ext4_super_block *es, |
| 2148 | ext4_fsblk_t n_blocks_count); |
Yongqiang Yang | 19c5246 | 2012-01-04 17:09:44 -0500 | [diff] [blame] | 2149 | extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2150 | |
| 2151 | /* super.c */ |
Theodore Ts'o | 952fc18 | 2012-07-09 16:27:05 -0400 | [diff] [blame] | 2152 | extern int ext4_calculate_overhead(struct super_block *sb); |
Darrick J. Wong | a9c47317 | 2012-04-29 18:29:10 -0400 | [diff] [blame] | 2153 | extern int ext4_superblock_csum_verify(struct super_block *sb, |
| 2154 | struct ext4_super_block *es); |
Theodore Ts'o | 06db49e | 2012-10-10 01:06:58 -0400 | [diff] [blame] | 2155 | extern void ext4_superblock_csum_set(struct super_block *sb); |
Theodore Ts'o | 9933fc0 | 2011-08-01 08:45:02 -0400 | [diff] [blame] | 2156 | extern void *ext4_kvmalloc(size_t size, gfp_t flags); |
| 2157 | extern void *ext4_kvzalloc(size_t size, gfp_t flags); |
| 2158 | extern void ext4_kvfree(void *ptr); |
Theodore Ts'o | 117fff1 | 2012-09-05 01:29:50 -0400 | [diff] [blame] | 2159 | extern int ext4_alloc_flex_bg_array(struct super_block *sb, |
| 2160 | ext4_group_t ngroup); |
Theodore Ts'o | 722887d | 2013-02-08 13:00:31 -0500 | [diff] [blame] | 2161 | extern const char *ext4_decode_error(struct super_block *sb, int errno, |
| 2162 | char nbuf[16]); |
Joe Perches | b9075fa | 2011-10-31 17:11:33 -0700 | [diff] [blame] | 2163 | extern __printf(4, 5) |
| 2164 | void __ext4_error(struct super_block *, const char *, unsigned int, |
| 2165 | const char *, ...); |
Theodore Ts'o | c398eda | 2010-07-27 11:56:40 -0400 | [diff] [blame] | 2166 | #define ext4_error(sb, message...) __ext4_error(sb, __func__, \ |
| 2167 | __LINE__, ## message) |
Joe Perches | b9075fa | 2011-10-31 17:11:33 -0700 | [diff] [blame] | 2168 | extern __printf(5, 6) |
| 2169 | void ext4_error_inode(struct inode *, const char *, unsigned int, ext4_fsblk_t, |
| 2170 | const char *, ...); |
| 2171 | extern __printf(5, 6) |
| 2172 | void ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t, |
| 2173 | const char *, ...); |
Theodore Ts'o | c398eda | 2010-07-27 11:56:40 -0400 | [diff] [blame] | 2174 | extern void __ext4_std_error(struct super_block *, const char *, |
| 2175 | unsigned int, int); |
Joe Perches | b9075fa | 2011-10-31 17:11:33 -0700 | [diff] [blame] | 2176 | extern __printf(4, 5) |
| 2177 | void __ext4_abort(struct super_block *, const char *, unsigned int, |
| 2178 | const char *, ...); |
Theodore Ts'o | c67d859 | 2010-06-29 11:07:07 -0400 | [diff] [blame] | 2179 | #define ext4_abort(sb, message...) __ext4_abort(sb, __func__, \ |
Theodore Ts'o | c398eda | 2010-07-27 11:56:40 -0400 | [diff] [blame] | 2180 | __LINE__, ## message) |
Joe Perches | b9075fa | 2011-10-31 17:11:33 -0700 | [diff] [blame] | 2181 | extern __printf(4, 5) |
| 2182 | void __ext4_warning(struct super_block *, const char *, unsigned int, |
| 2183 | const char *, ...); |
Theodore Ts'o | c398eda | 2010-07-27 11:56:40 -0400 | [diff] [blame] | 2184 | #define ext4_warning(sb, message...) __ext4_warning(sb, __func__, \ |
| 2185 | __LINE__, ## message) |
Joe Perches | b9075fa | 2011-10-31 17:11:33 -0700 | [diff] [blame] | 2186 | extern __printf(3, 4) |
| 2187 | void ext4_msg(struct super_block *, const char *, const char *, ...); |
Johann Lombardi | c5e06d1 | 2011-05-24 18:31:25 -0400 | [diff] [blame] | 2188 | extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp, |
| 2189 | const char *, unsigned int, const char *); |
| 2190 | #define dump_mmp_msg(sb, mmp, msg) __dump_mmp_msg(sb, mmp, __func__, \ |
| 2191 | __LINE__, msg) |
Joe Perches | b9075fa | 2011-10-31 17:11:33 -0700 | [diff] [blame] | 2192 | extern __printf(7, 8) |
| 2193 | void __ext4_grp_locked_error(const char *, unsigned int, |
| 2194 | struct super_block *, ext4_group_t, |
| 2195 | unsigned long, ext4_fsblk_t, |
| 2196 | const char *, ...); |
Theodore Ts'o | e29136f | 2010-06-29 12:54:28 -0400 | [diff] [blame] | 2197 | #define ext4_grp_locked_error(sb, grp, message...) \ |
| 2198 | __ext4_grp_locked_error(__func__, __LINE__, (sb), (grp), ## message) |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 2199 | extern void ext4_update_dynamic_rev(struct super_block *sb); |
Aneesh Kumar K.V | 99e6f82 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 2200 | extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb, |
| 2201 | __u32 compat); |
| 2202 | extern int ext4_update_rocompat_feature(handle_t *handle, |
| 2203 | struct super_block *sb, __u32 rocompat); |
| 2204 | extern int ext4_update_incompat_feature(handle_t *handle, |
| 2205 | struct super_block *sb, __u32 incompat); |
Alexandre Ratchov | 8fadc14 | 2006-10-11 01:21:15 -0700 | [diff] [blame] | 2206 | extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb, |
| 2207 | struct ext4_group_desc *bg); |
| 2208 | extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb, |
| 2209 | struct ext4_group_desc *bg); |
| 2210 | extern ext4_fsblk_t ext4_inode_table(struct super_block *sb, |
| 2211 | struct ext4_group_desc *bg); |
Theodore Ts'o | 021b65b | 2011-09-09 19:08:51 -0400 | [diff] [blame] | 2212 | extern __u32 ext4_free_group_clusters(struct super_block *sb, |
| 2213 | struct ext4_group_desc *bg); |
Aneesh Kumar K.V | 560671a | 2009-01-05 22:20:24 -0500 | [diff] [blame] | 2214 | extern __u32 ext4_free_inodes_count(struct super_block *sb, |
| 2215 | struct ext4_group_desc *bg); |
| 2216 | extern __u32 ext4_used_dirs_count(struct super_block *sb, |
| 2217 | struct ext4_group_desc *bg); |
| 2218 | extern __u32 ext4_itable_unused_count(struct super_block *sb, |
| 2219 | struct ext4_group_desc *bg); |
Alexandre Ratchov | 8fadc14 | 2006-10-11 01:21:15 -0700 | [diff] [blame] | 2220 | extern void ext4_block_bitmap_set(struct super_block *sb, |
| 2221 | struct ext4_group_desc *bg, ext4_fsblk_t blk); |
| 2222 | extern void ext4_inode_bitmap_set(struct super_block *sb, |
| 2223 | struct ext4_group_desc *bg, ext4_fsblk_t blk); |
| 2224 | extern void ext4_inode_table_set(struct super_block *sb, |
| 2225 | struct ext4_group_desc *bg, ext4_fsblk_t blk); |
Theodore Ts'o | 021b65b | 2011-09-09 19:08:51 -0400 | [diff] [blame] | 2226 | extern void ext4_free_group_clusters_set(struct super_block *sb, |
| 2227 | struct ext4_group_desc *bg, |
| 2228 | __u32 count); |
Aneesh Kumar K.V | 560671a | 2009-01-05 22:20:24 -0500 | [diff] [blame] | 2229 | extern void ext4_free_inodes_set(struct super_block *sb, |
| 2230 | struct ext4_group_desc *bg, __u32 count); |
| 2231 | extern void ext4_used_dirs_set(struct super_block *sb, |
| 2232 | struct ext4_group_desc *bg, __u32 count); |
| 2233 | extern void ext4_itable_unused_set(struct super_block *sb, |
| 2234 | struct ext4_group_desc *bg, __u32 count); |
Darrick J. Wong | feb0ab3 | 2012-04-29 18:45:10 -0400 | [diff] [blame] | 2235 | extern int ext4_group_desc_csum_verify(struct super_block *sb, __u32 group, |
Theodore Ts'o | bb23c20 | 2009-05-01 19:44:44 -0400 | [diff] [blame] | 2236 | struct ext4_group_desc *gdp); |
Darrick J. Wong | feb0ab3 | 2012-04-29 18:45:10 -0400 | [diff] [blame] | 2237 | extern void ext4_group_desc_csum_set(struct super_block *sb, __u32 group, |
| 2238 | struct ext4_group_desc *gdp); |
Theodore Ts'o | 7f51186 | 2013-01-13 08:41:45 -0500 | [diff] [blame] | 2239 | extern int ext4_register_li_request(struct super_block *sb, |
| 2240 | ext4_group_t first_not_zeroed); |
Laurent Vivier | bd81d8e | 2006-10-11 01:21:10 -0700 | [diff] [blame] | 2241 | |
Darrick J. Wong | 41a246d | 2012-04-29 18:33:10 -0400 | [diff] [blame] | 2242 | static inline int ext4_has_group_desc_csum(struct super_block *sb) |
| 2243 | { |
| 2244 | return EXT4_HAS_RO_COMPAT_FEATURE(sb, |
| 2245 | EXT4_FEATURE_RO_COMPAT_GDT_CSUM | |
| 2246 | EXT4_FEATURE_RO_COMPAT_METADATA_CSUM); |
| 2247 | } |
Laurent Vivier | bd81d8e | 2006-10-11 01:21:10 -0700 | [diff] [blame] | 2248 | |
| 2249 | static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es) |
| 2250 | { |
| 2251 | return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) | |
Aneesh Kumar K.V | 6bc9fef | 2007-10-16 18:38:25 -0400 | [diff] [blame] | 2252 | le32_to_cpu(es->s_blocks_count_lo); |
Laurent Vivier | bd81d8e | 2006-10-11 01:21:10 -0700 | [diff] [blame] | 2253 | } |
| 2254 | |
| 2255 | static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es) |
| 2256 | { |
| 2257 | return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) | |
Aneesh Kumar K.V | 308ba3e | 2007-10-16 18:38:25 -0400 | [diff] [blame] | 2258 | le32_to_cpu(es->s_r_blocks_count_lo); |
Laurent Vivier | bd81d8e | 2006-10-11 01:21:10 -0700 | [diff] [blame] | 2259 | } |
| 2260 | |
| 2261 | static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es) |
| 2262 | { |
| 2263 | return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) | |
Aneesh Kumar K.V | 308ba3e | 2007-10-16 18:38:25 -0400 | [diff] [blame] | 2264 | le32_to_cpu(es->s_free_blocks_count_lo); |
Laurent Vivier | bd81d8e | 2006-10-11 01:21:10 -0700 | [diff] [blame] | 2265 | } |
| 2266 | |
| 2267 | static inline void ext4_blocks_count_set(struct ext4_super_block *es, |
| 2268 | ext4_fsblk_t blk) |
| 2269 | { |
Aneesh Kumar K.V | 6bc9fef | 2007-10-16 18:38:25 -0400 | [diff] [blame] | 2270 | es->s_blocks_count_lo = cpu_to_le32((u32)blk); |
Laurent Vivier | bd81d8e | 2006-10-11 01:21:10 -0700 | [diff] [blame] | 2271 | es->s_blocks_count_hi = cpu_to_le32(blk >> 32); |
| 2272 | } |
| 2273 | |
| 2274 | static inline void ext4_free_blocks_count_set(struct ext4_super_block *es, |
| 2275 | ext4_fsblk_t blk) |
| 2276 | { |
Aneesh Kumar K.V | 308ba3e | 2007-10-16 18:38:25 -0400 | [diff] [blame] | 2277 | es->s_free_blocks_count_lo = cpu_to_le32((u32)blk); |
Laurent Vivier | bd81d8e | 2006-10-11 01:21:10 -0700 | [diff] [blame] | 2278 | es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32); |
| 2279 | } |
| 2280 | |
| 2281 | static inline void ext4_r_blocks_count_set(struct ext4_super_block *es, |
| 2282 | ext4_fsblk_t blk) |
| 2283 | { |
Aneesh Kumar K.V | 308ba3e | 2007-10-16 18:38:25 -0400 | [diff] [blame] | 2284 | es->s_r_blocks_count_lo = cpu_to_le32((u32)blk); |
Laurent Vivier | bd81d8e | 2006-10-11 01:21:10 -0700 | [diff] [blame] | 2285 | es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32); |
| 2286 | } |
| 2287 | |
Aneesh Kumar K.V | a48380f | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 2288 | static inline loff_t ext4_isize(struct ext4_inode *raw_inode) |
| 2289 | { |
Theodore Ts'o | 06a279d | 2009-01-17 18:41:37 -0500 | [diff] [blame] | 2290 | if (S_ISREG(le16_to_cpu(raw_inode->i_mode))) |
| 2291 | return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) | |
| 2292 | le32_to_cpu(raw_inode->i_size_lo); |
| 2293 | else |
| 2294 | return (loff_t) le32_to_cpu(raw_inode->i_size_lo); |
Aneesh Kumar K.V | a48380f | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 2295 | } |
Laurent Vivier | bd81d8e | 2006-10-11 01:21:10 -0700 | [diff] [blame] | 2296 | |
Aneesh Kumar K.V | a48380f | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 2297 | static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size) |
| 2298 | { |
| 2299 | raw_inode->i_size_lo = cpu_to_le32(i_size); |
| 2300 | raw_inode->i_size_high = cpu_to_le32(i_size >> 32); |
| 2301 | } |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2302 | |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 2303 | static inline |
| 2304 | struct ext4_group_info *ext4_get_group_info(struct super_block *sb, |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 2305 | ext4_group_t group) |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 2306 | { |
| 2307 | struct ext4_group_info ***grp_info; |
| 2308 | long indexv, indexh; |
| 2309 | grp_info = EXT4_SB(sb)->s_group_info; |
| 2310 | indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb)); |
| 2311 | indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1); |
| 2312 | return grp_info[indexv][indexh]; |
| 2313 | } |
| 2314 | |
Theodore Ts'o | 8df9675 | 2009-05-01 08:50:38 -0400 | [diff] [blame] | 2315 | /* |
| 2316 | * Reading s_groups_count requires using smp_rmb() afterwards. See |
| 2317 | * the locking protocol documented in the comments of ext4_group_add() |
| 2318 | * in resize.c |
| 2319 | */ |
| 2320 | static inline ext4_group_t ext4_get_groups_count(struct super_block *sb) |
| 2321 | { |
| 2322 | ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count; |
| 2323 | |
| 2324 | smp_rmb(); |
| 2325 | return ngroups; |
| 2326 | } |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 2327 | |
Jose R. Santos | 772cb7c | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 2328 | static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi, |
| 2329 | ext4_group_t block_group) |
| 2330 | { |
| 2331 | return block_group >> sbi->s_log_groups_per_flex; |
| 2332 | } |
| 2333 | |
| 2334 | static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi) |
| 2335 | { |
| 2336 | return 1 << sbi->s_log_groups_per_flex; |
| 2337 | } |
| 2338 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2339 | #define ext4_std_error(sb, errno) \ |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2340 | do { \ |
| 2341 | if ((errno)) \ |
Theodore Ts'o | c398eda | 2010-07-27 11:56:40 -0400 | [diff] [blame] | 2342 | __ext4_std_error((sb), __func__, __LINE__, (errno)); \ |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2343 | } while (0) |
| 2344 | |
Aneesh Kumar K.V | a30d542a | 2008-10-09 10:56:23 -0400 | [diff] [blame] | 2345 | #ifdef CONFIG_SMP |
Theodore Ts'o | df55c99 | 2011-09-09 19:16:51 -0400 | [diff] [blame] | 2346 | /* Each CPU can accumulate percpu_counter_batch clusters in their local |
| 2347 | * counters. So we need to make sure we have free clusters more |
Eric Dumazet | 179f7eb | 2009-01-06 14:41:04 -0800 | [diff] [blame] | 2348 | * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times. |
Aneesh Kumar K.V | a30d542a | 2008-10-09 10:56:23 -0400 | [diff] [blame] | 2349 | */ |
Theodore Ts'o | df55c99 | 2011-09-09 19:16:51 -0400 | [diff] [blame] | 2350 | #define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids)) |
Aneesh Kumar K.V | a30d542a | 2008-10-09 10:56:23 -0400 | [diff] [blame] | 2351 | #else |
Theodore Ts'o | df55c99 | 2011-09-09 19:16:51 -0400 | [diff] [blame] | 2352 | #define EXT4_FREECLUSTERS_WATERMARK 0 |
Aneesh Kumar K.V | a30d542a | 2008-10-09 10:56:23 -0400 | [diff] [blame] | 2353 | #endif |
| 2354 | |
Aneesh Kumar K.V | cf17fea | 2008-09-13 13:06:18 -0400 | [diff] [blame] | 2355 | static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize) |
| 2356 | { |
| 2357 | /* |
| 2358 | * XXX: replace with spinlock if seen contended -bzzz |
| 2359 | */ |
| 2360 | down_write(&EXT4_I(inode)->i_data_sem); |
| 2361 | if (newsize > EXT4_I(inode)->i_disksize) |
| 2362 | EXT4_I(inode)->i_disksize = newsize; |
| 2363 | up_write(&EXT4_I(inode)->i_data_sem); |
| 2364 | return ; |
| 2365 | } |
Aneesh Kumar K.V | a30d542a | 2008-10-09 10:56:23 -0400 | [diff] [blame] | 2366 | |
Aneesh Kumar K.V | 5d1b1b3 | 2009-01-05 22:19:52 -0500 | [diff] [blame] | 2367 | struct ext4_group_info { |
| 2368 | unsigned long bb_state; |
| 2369 | struct rb_root bb_free_root; |
Eric Sandeen | a36b449 | 2009-08-25 22:36:45 -0400 | [diff] [blame] | 2370 | ext4_grpblk_t bb_first_free; /* first free block */ |
| 2371 | ext4_grpblk_t bb_free; /* total free blocks */ |
| 2372 | ext4_grpblk_t bb_fragments; /* nr of freespace fragments */ |
Curt Wohlgemuth | 8a57d9d | 2010-05-16 15:00:00 -0400 | [diff] [blame] | 2373 | ext4_grpblk_t bb_largest_free_order;/* order of largest frag in BG */ |
Aneesh Kumar K.V | 5d1b1b3 | 2009-01-05 22:19:52 -0500 | [diff] [blame] | 2374 | struct list_head bb_prealloc_list; |
| 2375 | #ifdef DOUBLE_CHECK |
| 2376 | void *bb_bitmap; |
| 2377 | #endif |
| 2378 | struct rw_semaphore alloc_sem; |
Eric Sandeen | a36b449 | 2009-08-25 22:36:45 -0400 | [diff] [blame] | 2379 | ext4_grpblk_t bb_counters[]; /* Nr of free power-of-two-block |
| 2380 | * regions, index is order. |
| 2381 | * bb_counters[3] = 5 means |
| 2382 | * 5 free 8-block regions. */ |
Aneesh Kumar K.V | 5d1b1b3 | 2009-01-05 22:19:52 -0500 | [diff] [blame] | 2383 | }; |
| 2384 | |
Tao Ma | 3d56b8d | 2011-07-11 00:03:38 -0400 | [diff] [blame] | 2385 | #define EXT4_GROUP_INFO_NEED_INIT_BIT 0 |
| 2386 | #define EXT4_GROUP_INFO_WAS_TRIMMED_BIT 1 |
Aneesh Kumar K.V | 5d1b1b3 | 2009-01-05 22:19:52 -0500 | [diff] [blame] | 2387 | |
| 2388 | #define EXT4_MB_GRP_NEED_INIT(grp) \ |
| 2389 | (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state))) |
| 2390 | |
Tao Ma | 3d56b8d | 2011-07-11 00:03:38 -0400 | [diff] [blame] | 2391 | #define EXT4_MB_GRP_WAS_TRIMMED(grp) \ |
| 2392 | (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) |
| 2393 | #define EXT4_MB_GRP_SET_TRIMMED(grp) \ |
| 2394 | (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) |
| 2395 | #define EXT4_MB_GRP_CLEAR_TRIMMED(grp) \ |
| 2396 | (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) |
| 2397 | |
Theodore Ts'o | 5079748 | 2009-09-18 13:34:02 -0400 | [diff] [blame] | 2398 | #define EXT4_MAX_CONTENTION 8 |
| 2399 | #define EXT4_CONTENTION_THRESHOLD 2 |
| 2400 | |
Aneesh Kumar K.V | 955ce5f | 2009-05-02 20:35:09 -0400 | [diff] [blame] | 2401 | static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb, |
| 2402 | ext4_group_t group) |
| 2403 | { |
| 2404 | return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group); |
| 2405 | } |
| 2406 | |
Theodore Ts'o | 5079748 | 2009-09-18 13:34:02 -0400 | [diff] [blame] | 2407 | /* |
| 2408 | * Returns true if the filesystem is busy enough that attempts to |
| 2409 | * access the block group locks has run into contention. |
| 2410 | */ |
| 2411 | static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi) |
| 2412 | { |
| 2413 | return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD); |
| 2414 | } |
| 2415 | |
Aneesh Kumar K.V | 5d1b1b3 | 2009-01-05 22:19:52 -0500 | [diff] [blame] | 2416 | static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group) |
| 2417 | { |
Theodore Ts'o | 5079748 | 2009-09-18 13:34:02 -0400 | [diff] [blame] | 2418 | spinlock_t *lock = ext4_group_lock_ptr(sb, group); |
| 2419 | if (spin_trylock(lock)) |
| 2420 | /* |
| 2421 | * We're able to grab the lock right away, so drop the |
| 2422 | * lock contention counter. |
| 2423 | */ |
| 2424 | atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0); |
| 2425 | else { |
| 2426 | /* |
| 2427 | * The lock is busy, so bump the contention counter, |
| 2428 | * and then wait on the spin lock. |
| 2429 | */ |
| 2430 | atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1, |
| 2431 | EXT4_MAX_CONTENTION); |
| 2432 | spin_lock(lock); |
| 2433 | } |
Aneesh Kumar K.V | 5d1b1b3 | 2009-01-05 22:19:52 -0500 | [diff] [blame] | 2434 | } |
| 2435 | |
| 2436 | static inline void ext4_unlock_group(struct super_block *sb, |
| 2437 | ext4_group_t group) |
| 2438 | { |
Aneesh Kumar K.V | 955ce5f | 2009-05-02 20:35:09 -0400 | [diff] [blame] | 2439 | spin_unlock(ext4_group_lock_ptr(sb, group)); |
Aneesh Kumar K.V | 5d1b1b3 | 2009-01-05 22:19:52 -0500 | [diff] [blame] | 2440 | } |
| 2441 | |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2442 | /* |
Theodore Ts'o | 1f7d1e7 | 2011-06-27 19:16:02 -0400 | [diff] [blame] | 2443 | * Block validity checking |
| 2444 | */ |
| 2445 | #define ext4_check_indirect_blockref(inode, bh) \ |
| 2446 | ext4_check_blockref(__func__, __LINE__, inode, \ |
| 2447 | (__le32 *)(bh)->b_data, \ |
| 2448 | EXT4_ADDR_PER_BLOCK((inode)->i_sb)) |
| 2449 | |
| 2450 | #define ext4_ind_check_inode(inode) \ |
| 2451 | ext4_check_blockref(__func__, __LINE__, inode, \ |
| 2452 | EXT4_I(inode)->i_data, \ |
| 2453 | EXT4_NDIR_BLOCKS) |
| 2454 | |
| 2455 | /* |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2456 | * Inodes and files operations |
| 2457 | */ |
| 2458 | |
| 2459 | /* dir.c */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2460 | extern const struct file_operations ext4_dir_operations; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2461 | |
| 2462 | /* file.c */ |
Arjan van de Ven | c5ef1c4 | 2007-02-12 00:55:40 -0800 | [diff] [blame] | 2463 | extern const struct inode_operations ext4_file_inode_operations; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2464 | extern const struct file_operations ext4_file_operations; |
Toshiyuki Okajima | e0d10bf | 2010-10-27 21:30:06 -0400 | [diff] [blame] | 2465 | extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin); |
Dmitry Monakhov | c278531 | 2012-10-05 11:31:55 -0400 | [diff] [blame] | 2466 | extern void ext4_unwritten_wait(struct inode *inode); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2467 | |
Theodore Ts'o | 95eaefb | 2013-02-09 15:23:03 -0500 | [diff] [blame] | 2468 | /* inline.c */ |
| 2469 | extern int ext4_has_inline_data(struct inode *inode); |
| 2470 | extern int ext4_get_inline_size(struct inode *inode); |
| 2471 | extern int ext4_get_max_inline_size(struct inode *inode); |
| 2472 | extern int ext4_find_inline_data_nolock(struct inode *inode); |
| 2473 | extern void ext4_write_inline_data(struct inode *inode, |
| 2474 | struct ext4_iloc *iloc, |
| 2475 | void *buffer, loff_t pos, |
| 2476 | unsigned int len); |
| 2477 | extern int ext4_prepare_inline_data(handle_t *handle, struct inode *inode, |
| 2478 | unsigned int len); |
| 2479 | extern int ext4_init_inline_data(handle_t *handle, struct inode *inode, |
| 2480 | unsigned int len); |
| 2481 | extern int ext4_destroy_inline_data(handle_t *handle, struct inode *inode); |
| 2482 | |
| 2483 | extern int ext4_readpage_inline(struct inode *inode, struct page *page); |
| 2484 | extern int ext4_try_to_write_inline_data(struct address_space *mapping, |
| 2485 | struct inode *inode, |
| 2486 | loff_t pos, unsigned len, |
| 2487 | unsigned flags, |
| 2488 | struct page **pagep); |
| 2489 | extern int ext4_write_inline_data_end(struct inode *inode, |
| 2490 | loff_t pos, unsigned len, |
| 2491 | unsigned copied, |
| 2492 | struct page *page); |
| 2493 | extern struct buffer_head * |
| 2494 | ext4_journalled_write_inline_data(struct inode *inode, |
| 2495 | unsigned len, |
| 2496 | struct page *page); |
| 2497 | extern int ext4_da_write_inline_data_begin(struct address_space *mapping, |
| 2498 | struct inode *inode, |
| 2499 | loff_t pos, unsigned len, |
| 2500 | unsigned flags, |
| 2501 | struct page **pagep, |
| 2502 | void **fsdata); |
| 2503 | extern int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos, |
| 2504 | unsigned len, unsigned copied, |
| 2505 | struct page *page); |
| 2506 | extern int ext4_try_add_inline_entry(handle_t *handle, struct dentry *dentry, |
| 2507 | struct inode *inode); |
| 2508 | extern int ext4_try_create_inline_dir(handle_t *handle, |
| 2509 | struct inode *parent, |
| 2510 | struct inode *inode); |
| 2511 | extern int ext4_read_inline_dir(struct file *filp, |
| 2512 | void *dirent, filldir_t filldir, |
| 2513 | int *has_inline_data); |
| 2514 | extern struct buffer_head *ext4_find_inline_entry(struct inode *dir, |
| 2515 | const struct qstr *d_name, |
| 2516 | struct ext4_dir_entry_2 **res_dir, |
| 2517 | int *has_inline_data); |
| 2518 | extern int ext4_delete_inline_entry(handle_t *handle, |
| 2519 | struct inode *dir, |
| 2520 | struct ext4_dir_entry_2 *de_del, |
| 2521 | struct buffer_head *bh, |
| 2522 | int *has_inline_data); |
| 2523 | extern int empty_inline_dir(struct inode *dir, int *has_inline_data); |
| 2524 | extern struct buffer_head *ext4_get_first_inline_block(struct inode *inode, |
| 2525 | struct ext4_dir_entry_2 **parent_de, |
| 2526 | int *retval); |
| 2527 | extern int ext4_inline_data_fiemap(struct inode *inode, |
| 2528 | struct fiemap_extent_info *fieinfo, |
| 2529 | int *has_inline); |
| 2530 | extern int ext4_try_to_evict_inline_data(handle_t *handle, |
| 2531 | struct inode *inode, |
| 2532 | int needed); |
| 2533 | extern void ext4_inline_data_truncate(struct inode *inode, int *has_inline); |
| 2534 | |
| 2535 | extern int ext4_convert_inline_data(struct inode *inode); |
| 2536 | |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2537 | /* namei.c */ |
Arjan van de Ven | c5ef1c4 | 2007-02-12 00:55:40 -0800 | [diff] [blame] | 2538 | extern const struct inode_operations ext4_dir_inode_operations; |
| 2539 | extern const struct inode_operations ext4_special_inode_operations; |
Theodore Ts'o | 596397b | 2009-05-01 13:49:15 -0400 | [diff] [blame] | 2540 | extern struct dentry *ext4_get_parent(struct dentry *child); |
Tao Ma | a774f9c | 2012-12-10 14:05:57 -0500 | [diff] [blame] | 2541 | extern struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode, |
| 2542 | struct ext4_dir_entry_2 *de, |
| 2543 | int blocksize, int csum_size, |
| 2544 | unsigned int parent_ino, int dotdot_real_len); |
Tao Ma | 3c47d54 | 2012-12-10 14:05:59 -0500 | [diff] [blame] | 2545 | extern void initialize_dirent_tail(struct ext4_dir_entry_tail *t, |
| 2546 | unsigned int blocksize); |
| 2547 | extern int ext4_handle_dirty_dirent_node(handle_t *handle, |
| 2548 | struct inode *inode, |
| 2549 | struct buffer_head *bh); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2550 | |
| 2551 | /* symlink.c */ |
Arjan van de Ven | c5ef1c4 | 2007-02-12 00:55:40 -0800 | [diff] [blame] | 2552 | extern const struct inode_operations ext4_symlink_inode_operations; |
| 2553 | extern const struct inode_operations ext4_fast_symlink_inode_operations; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2554 | |
Theodore Ts'o | 6fd058f | 2009-05-17 15:38:01 -0400 | [diff] [blame] | 2555 | /* block_validity */ |
| 2556 | extern void ext4_release_system_zone(struct super_block *sb); |
| 2557 | extern int ext4_setup_system_zone(struct super_block *sb); |
Theodore Ts'o | 5dabfc7 | 2010-10-27 21:30:14 -0400 | [diff] [blame] | 2558 | extern int __init ext4_init_system_zone(void); |
| 2559 | extern void ext4_exit_system_zone(void); |
Theodore Ts'o | 6fd058f | 2009-05-17 15:38:01 -0400 | [diff] [blame] | 2560 | extern int ext4_data_block_valid(struct ext4_sb_info *sbi, |
| 2561 | ext4_fsblk_t start_blk, |
| 2562 | unsigned int count); |
Theodore Ts'o | 1f7d1e7 | 2011-06-27 19:16:02 -0400 | [diff] [blame] | 2563 | extern int ext4_check_blockref(const char *, unsigned int, |
| 2564 | struct inode *, __le32 *, unsigned int); |
Theodore Ts'o | 6fd058f | 2009-05-17 15:38:01 -0400 | [diff] [blame] | 2565 | |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2566 | /* extents.c */ |
Theodore Ts'o | 4a092d7 | 2012-11-28 13:03:30 -0500 | [diff] [blame] | 2567 | struct ext4_ext_path; |
| 2568 | struct ext4_extent; |
| 2569 | |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2570 | extern int ext4_ext_tree_init(handle_t *handle, struct inode *); |
| 2571 | extern int ext4_ext_writepage_trans_blocks(struct inode *, int); |
Mingming Cao | a02908f | 2008-08-19 22:16:07 -0400 | [diff] [blame] | 2572 | extern int ext4_ext_index_trans_blocks(struct inode *inode, int nrblocks, |
| 2573 | int chunk); |
Theodore Ts'o | e35fd66 | 2010-05-16 19:00:00 -0400 | [diff] [blame] | 2574 | extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode, |
| 2575 | struct ext4_map_blocks *map, int flags); |
Jan Kara | cf108bc | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 2576 | extern void ext4_ext_truncate(struct inode *); |
Allison Henderson | a4bb6b6 | 2011-05-25 07:41:50 -0400 | [diff] [blame] | 2577 | extern int ext4_ext_punch_hole(struct file *file, loff_t offset, |
| 2578 | loff_t length); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2579 | extern void ext4_ext_init(struct super_block *); |
| 2580 | extern void ext4_ext_release(struct super_block *); |
Christoph Hellwig | 2fe17c1 | 2011-01-14 13:07:43 +0100 | [diff] [blame] | 2581 | extern long ext4_fallocate(struct file *file, int mode, loff_t offset, |
Amit Arora | a2df2a6 | 2007-07-17 21:42:41 -0400 | [diff] [blame] | 2582 | loff_t len); |
Mingming Cao | 0031462 | 2009-09-28 15:49:08 -0400 | [diff] [blame] | 2583 | extern int ext4_convert_unwritten_extents(struct inode *inode, loff_t offset, |
Eric Sandeen | a1de02d | 2010-02-04 23:58:38 -0500 | [diff] [blame] | 2584 | ssize_t len); |
Theodore Ts'o | e35fd66 | 2010-05-16 19:00:00 -0400 | [diff] [blame] | 2585 | extern int ext4_map_blocks(handle_t *handle, struct inode *inode, |
| 2586 | struct ext4_map_blocks *map, int flags); |
Theodore Ts'o | 4a092d7 | 2012-11-28 13:03:30 -0500 | [diff] [blame] | 2587 | extern int ext4_ext_calc_metadata_amount(struct inode *inode, |
| 2588 | ext4_lblk_t lblocks); |
| 2589 | extern int ext4_extent_tree_init(handle_t *, struct inode *); |
| 2590 | extern int ext4_ext_calc_credits_for_single_extent(struct inode *inode, |
| 2591 | int num, |
| 2592 | struct ext4_ext_path *path); |
| 2593 | extern int ext4_can_extents_be_merged(struct inode *inode, |
| 2594 | struct ext4_extent *ex1, |
| 2595 | struct ext4_extent *ex2); |
| 2596 | extern int ext4_ext_insert_extent(handle_t *, struct inode *, |
| 2597 | struct ext4_ext_path *, |
| 2598 | struct ext4_extent *, int); |
| 2599 | extern struct ext4_ext_path *ext4_ext_find_extent(struct inode *, ext4_lblk_t, |
| 2600 | struct ext4_ext_path *); |
| 2601 | extern void ext4_ext_drop_refs(struct ext4_ext_path *); |
| 2602 | extern int ext4_ext_check_inode(struct inode *inode); |
Zheng Liu | f7fec03 | 2013-02-18 00:28:47 -0500 | [diff] [blame] | 2603 | extern int ext4_find_delalloc_range(struct inode *inode, |
| 2604 | ext4_lblk_t lblk_start, |
| 2605 | ext4_lblk_t lblk_end); |
Theodore Ts'o | 4a092d7 | 2012-11-28 13:03:30 -0500 | [diff] [blame] | 2606 | extern int ext4_find_delalloc_cluster(struct inode *inode, ext4_lblk_t lblk); |
Aneesh Kumar K.V | 3a06d77 | 2008-11-22 15:04:59 -0500 | [diff] [blame] | 2607 | extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, |
| 2608 | __u64 start, __u64 len); |
Theodore Ts'o | 4a092d7 | 2012-11-28 13:03:30 -0500 | [diff] [blame] | 2609 | |
| 2610 | |
Akira Fujita | 748de67 | 2009-06-17 19:24:03 -0400 | [diff] [blame] | 2611 | /* move_extent.c */ |
| 2612 | extern int ext4_move_extents(struct file *o_filp, struct file *d_filp, |
| 2613 | __u64 start_orig, __u64 start_donor, |
| 2614 | __u64 len, __u64 *moved_len); |
| 2615 | |
Theodore Ts'o | bd2d021 | 2010-10-27 21:30:10 -0400 | [diff] [blame] | 2616 | /* page-io.c */ |
Theodore Ts'o | 5dabfc7 | 2010-10-27 21:30:14 -0400 | [diff] [blame] | 2617 | extern int __init ext4_init_pageio(void); |
Dmitry Monakhov | 28a535f | 2012-09-29 00:14:55 -0400 | [diff] [blame] | 2618 | extern void ext4_add_complete_io(ext4_io_end_t *io_end); |
Theodore Ts'o | 5dabfc7 | 2010-10-27 21:30:14 -0400 | [diff] [blame] | 2619 | extern void ext4_exit_pageio(void); |
Theodore Ts'o | f7ad6d2 | 2010-11-08 13:43:33 -0500 | [diff] [blame] | 2620 | extern void ext4_ioend_wait(struct inode *); |
Theodore Ts'o | bd2d021 | 2010-10-27 21:30:10 -0400 | [diff] [blame] | 2621 | extern void ext4_free_io_end(ext4_io_end_t *io); |
| 2622 | extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags); |
Jan Kara | 84c1754 | 2013-01-28 09:43:46 -0500 | [diff] [blame] | 2623 | extern void ext4_end_io_work(struct work_struct *work); |
Theodore Ts'o | bd2d021 | 2010-10-27 21:30:10 -0400 | [diff] [blame] | 2624 | extern void ext4_io_submit(struct ext4_io_submit *io); |
| 2625 | extern int ext4_bio_write_page(struct ext4_io_submit *io, |
| 2626 | struct page *page, |
| 2627 | int len, |
| 2628 | struct writeback_control *wbc); |
Aneesh Kumar K.V | 3a06d77 | 2008-11-22 15:04:59 -0500 | [diff] [blame] | 2629 | |
Johann Lombardi | c5e06d1 | 2011-05-24 18:31:25 -0400 | [diff] [blame] | 2630 | /* mmp.c */ |
| 2631 | extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t); |
Darrick J. Wong | 5c359a4 | 2012-04-29 18:47:10 -0400 | [diff] [blame] | 2632 | extern void ext4_mmp_csum_set(struct super_block *sb, struct mmp_struct *mmp); |
| 2633 | extern int ext4_mmp_csum_verify(struct super_block *sb, |
| 2634 | struct mmp_struct *mmp); |
Johann Lombardi | c5e06d1 | 2011-05-24 18:31:25 -0400 | [diff] [blame] | 2635 | |
Jiaying Zhang | 744692d | 2010-03-04 16:14:02 -0500 | [diff] [blame] | 2636 | /* BH_Uninit flag: blocks are allocated but uninitialized on disk */ |
| 2637 | enum ext4_state_bits { |
| 2638 | BH_Uninit /* blocks are allocated but uninitialized on disk */ |
| 2639 | = BH_JBDPrivateStart, |
Aditya Kali | 7b415bf | 2011-09-09 19:04:51 -0400 | [diff] [blame] | 2640 | BH_AllocFromCluster, /* allocated blocks were part of already |
| 2641 | * allocated cluster. Note that this flag will |
| 2642 | * never, ever appear in a buffer_head's state |
| 2643 | * flag. See EXT4_MAP_FROM_CLUSTER to see where |
| 2644 | * this is used. */ |
Jiaying Zhang | 744692d | 2010-03-04 16:14:02 -0500 | [diff] [blame] | 2645 | }; |
| 2646 | |
| 2647 | BUFFER_FNS(Uninit, uninit) |
| 2648 | TAS_BUFFER_FNS(Uninit, uninit) |
| 2649 | |
Aneesh Kumar K.V | 2ccb5fb | 2009-01-05 21:49:55 -0500 | [diff] [blame] | 2650 | /* |
Adam Buchbinder | 48fc7f7 | 2012-09-19 21:48:00 -0400 | [diff] [blame] | 2651 | * Add new method to test whether block and inode bitmaps are properly |
Aneesh Kumar K.V | 2ccb5fb | 2009-01-05 21:49:55 -0500 | [diff] [blame] | 2652 | * initialized. With uninit_bg reading the block from disk is not enough |
| 2653 | * to mark the bitmap uptodate. We need to also zero-out the bitmap |
| 2654 | */ |
| 2655 | #define BH_BITMAP_UPTODATE BH_JBDPrivateStart |
| 2656 | |
| 2657 | static inline int bitmap_uptodate(struct buffer_head *bh) |
| 2658 | { |
| 2659 | return (buffer_uptodate(bh) && |
| 2660 | test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state)); |
| 2661 | } |
| 2662 | static inline void set_bitmap_uptodate(struct buffer_head *bh) |
| 2663 | { |
| 2664 | set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state); |
| 2665 | } |
| 2666 | |
Dmitry Monakhov | 17335dc | 2012-09-29 00:41:21 -0400 | [diff] [blame] | 2667 | /* |
| 2668 | * Disable DIO read nolock optimization, so new dioreaders will be forced |
| 2669 | * to grab i_mutex |
| 2670 | */ |
| 2671 | static inline void ext4_inode_block_unlocked_dio(struct inode *inode) |
| 2672 | { |
| 2673 | ext4_set_inode_state(inode, EXT4_STATE_DIOREAD_LOCK); |
| 2674 | smp_mb(); |
| 2675 | } |
| 2676 | static inline void ext4_inode_resume_unlocked_dio(struct inode *inode) |
| 2677 | { |
| 2678 | smp_mb(); |
| 2679 | ext4_clear_inode_state(inode, EXT4_STATE_DIOREAD_LOCK); |
| 2680 | } |
| 2681 | |
Akinobu Mita | 731eb1a | 2010-03-03 23:55:01 -0500 | [diff] [blame] | 2682 | #define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1) |
| 2683 | |
Eric Sandeen | e9e3bce | 2011-02-12 08:17:34 -0500 | [diff] [blame] | 2684 | /* For ioend & aio unwritten conversion wait queues */ |
| 2685 | #define EXT4_WQ_HASH_SZ 37 |
| 2686 | #define ext4_ioend_wq(v) (&ext4__ioend_wq[((unsigned long)(v)) %\ |
| 2687 | EXT4_WQ_HASH_SZ]) |
| 2688 | #define ext4_aio_mutex(v) (&ext4__aio_mutex[((unsigned long)(v)) %\ |
| 2689 | EXT4_WQ_HASH_SZ]) |
| 2690 | extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ]; |
| 2691 | extern struct mutex ext4__aio_mutex[EXT4_WQ_HASH_SZ]; |
| 2692 | |
Yongqiang Yang | 8f82f84 | 2011-07-26 21:35:44 -0400 | [diff] [blame] | 2693 | #define EXT4_RESIZING 0 |
| 2694 | extern int ext4_resize_begin(struct super_block *sb); |
| 2695 | extern void ext4_resize_end(struct super_block *sb); |
| 2696 | |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2697 | #endif /* __KERNEL__ */ |
| 2698 | |
Christoph Hellwig | 3dcf545 | 2008-04-29 18:13:32 -0400 | [diff] [blame] | 2699 | #endif /* _EXT4_H */ |