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Commit | Line | Data |
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ac27a0ec | 1 | /* |
3dcf5451 | 2 | * ext4.h |
ac27a0ec DK |
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 | ||
3dcf5451 CH |
16 | #ifndef _EXT4_H |
17 | #define _EXT4_H | |
ac27a0ec DK |
18 | |
19 | #include <linux/types.h> | |
3a5b2ecd | 20 | #include <linux/blkdev.h> |
ac27a0ec | 21 | #include <linux/magic.h> |
2ccb5fb9 | 22 | #include <linux/jbd2.h> |
60e58e0f | 23 | #include <linux/quota.h> |
d444c3c3 TT |
24 | #include <linux/rwsem.h> |
25 | #include <linux/rbtree.h> | |
26 | #include <linux/seqlock.h> | |
27 | #include <linux/mutex.h> | |
ca0faba0 TT |
28 | #include <linux/timer.h> |
29 | #include <linux/wait.h> | |
30 | #include <linux/blockgroup_lock.h> | |
31 | #include <linux/percpu_counter.h> | |
0441984a | 32 | #include <crypto/hash.h> |
4d92dc0f BH |
33 | #ifdef __KERNEL__ |
34 | #include <linux/compat.h> | |
35 | #endif | |
c9de560d | 36 | |
ac27a0ec | 37 | /* |
8a35694e | 38 | * The fourth extended filesystem constants/structures |
ac27a0ec DK |
39 | */ |
40 | ||
41 | /* | |
617ba13b | 42 | * Define EXT4FS_DEBUG to produce debug messages |
ac27a0ec | 43 | */ |
617ba13b | 44 | #undef EXT4FS_DEBUG |
ac27a0ec | 45 | |
ac27a0ec DK |
46 | /* |
47 | * Debug code | |
48 | */ | |
617ba13b MC |
49 | #ifdef EXT4FS_DEBUG |
50 | #define ext4_debug(f, a...) \ | |
ac27a0ec | 51 | do { \ |
af5bc92d | 52 | printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \ |
4db9c54a | 53 | __FILE__, __LINE__, __func__); \ |
af5bc92d | 54 | printk(KERN_DEBUG f, ## a); \ |
ac27a0ec DK |
55 | } while (0) |
56 | #else | |
ace36ad4 | 57 | #define ext4_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__) |
ac27a0ec DK |
58 | #endif |
59 | ||
273df556 | 60 | #define EXT4_ERROR_INODE(inode, fmt, a...) \ |
c398eda0 TT |
61 | ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a) |
62 | ||
63 | #define EXT4_ERROR_INODE_BLOCK(inode, block, fmt, a...) \ | |
64 | ext4_error_inode((inode), __func__, __LINE__, (block), (fmt), ## a) | |
273df556 | 65 | |
f7c21177 TT |
66 | #define EXT4_ERROR_FILE(file, block, fmt, a...) \ |
67 | ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a) | |
273df556 | 68 | |
d444c3c3 TT |
69 | /* data type for block offset of block group */ |
70 | typedef int ext4_grpblk_t; | |
71 | ||
72 | /* data type for filesystem-wide blocks number */ | |
73 | typedef unsigned long long ext4_fsblk_t; | |
74 | ||
75 | /* data type for file logical block number */ | |
76 | typedef __u32 ext4_lblk_t; | |
77 | ||
78 | /* data type for block group number */ | |
79 | typedef unsigned int ext4_group_t; | |
80 | ||
296c355c | 81 | /* |
60e6679e | 82 | * Flags used in mballoc's allocation_context flags field. |
296c355c TT |
83 | * |
84 | * Also used to show what's going on for debugging purposes when the | |
85 | * flag field is exported via the traceport interface | |
86 | */ | |
d444c3c3 | 87 | |
c9de560d | 88 | /* prefer goal again. length */ |
0ef90db9 | 89 | #define EXT4_MB_HINT_MERGE 0x0001 |
c9de560d | 90 | /* blocks already reserved */ |
0ef90db9 | 91 | #define EXT4_MB_HINT_RESERVED 0x0002 |
c9de560d | 92 | /* metadata is being allocated */ |
0ef90db9 | 93 | #define EXT4_MB_HINT_METADATA 0x0004 |
c9de560d | 94 | /* first blocks in the file */ |
0ef90db9 | 95 | #define EXT4_MB_HINT_FIRST 0x0008 |
c9de560d | 96 | /* search for the best chunk */ |
0ef90db9 | 97 | #define EXT4_MB_HINT_BEST 0x0010 |
c9de560d | 98 | /* data is being allocated */ |
0ef90db9 | 99 | #define EXT4_MB_HINT_DATA 0x0020 |
c9de560d | 100 | /* don't preallocate (for tails) */ |
0ef90db9 | 101 | #define EXT4_MB_HINT_NOPREALLOC 0x0040 |
c9de560d | 102 | /* allocate for locality group */ |
0ef90db9 | 103 | #define EXT4_MB_HINT_GROUP_ALLOC 0x0080 |
c9de560d | 104 | /* allocate goal blocks or none */ |
0ef90db9 | 105 | #define EXT4_MB_HINT_GOAL_ONLY 0x0100 |
c9de560d | 106 | /* goal is meaningful */ |
0ef90db9 | 107 | #define EXT4_MB_HINT_TRY_GOAL 0x0200 |
d2a17637 | 108 | /* blocks already pre-reserved by delayed allocation */ |
0ef90db9 | 109 | #define EXT4_MB_DELALLOC_RESERVED 0x0400 |
4ba74d00 TT |
110 | /* We are doing stream allocation */ |
111 | #define EXT4_MB_STREAM_ALLOC 0x0800 | |
55f020db AH |
112 | /* Use reserved root blocks if needed */ |
113 | #define EXT4_MB_USE_ROOT_BLOCKS 0x1000 | |
c9de560d AT |
114 | |
115 | struct ext4_allocation_request { | |
116 | /* target inode for block we're allocating */ | |
117 | struct inode *inode; | |
726447d8 ES |
118 | /* how many blocks we want to allocate */ |
119 | unsigned int len; | |
c9de560d AT |
120 | /* logical block in target inode */ |
121 | ext4_lblk_t logical; | |
c9de560d AT |
122 | /* the closest logical allocated block to the left */ |
123 | ext4_lblk_t lleft; | |
c9de560d AT |
124 | /* the closest logical allocated block to the right */ |
125 | ext4_lblk_t lright; | |
726447d8 ES |
126 | /* phys. target (a hint) */ |
127 | ext4_fsblk_t goal; | |
128 | /* phys. block for the closest logical allocated block to the left */ | |
129 | ext4_fsblk_t pleft; | |
130 | /* phys. block for the closest logical allocated block to the right */ | |
c9de560d | 131 | ext4_fsblk_t pright; |
c9de560d | 132 | /* flags. see above EXT4_MB_HINT_* */ |
498e5f24 | 133 | unsigned int flags; |
c9de560d AT |
134 | }; |
135 | ||
e35fd660 TT |
136 | /* |
137 | * Logical to physical block mapping, used by ext4_map_blocks() | |
138 | * | |
139 | * This structure is used to pass requests into ext4_map_blocks() as | |
140 | * well as to store the information returned by ext4_map_blocks(). It | |
141 | * takes less room on the stack than a struct buffer_head. | |
142 | */ | |
143 | #define EXT4_MAP_NEW (1 << BH_New) | |
144 | #define EXT4_MAP_MAPPED (1 << BH_Mapped) | |
145 | #define EXT4_MAP_UNWRITTEN (1 << BH_Unwritten) | |
146 | #define EXT4_MAP_BOUNDARY (1 << BH_Boundary) | |
147 | #define EXT4_MAP_UNINIT (1 << BH_Uninit) | |
7b415bf6 AK |
148 | /* Sometimes (in the bigalloc case, from ext4_da_get_block_prep) the caller of |
149 | * ext4_map_blocks wants to know whether or not the underlying cluster has | |
150 | * already been accounted for. EXT4_MAP_FROM_CLUSTER conveys to the caller that | |
151 | * the requested mapping was from previously mapped (or delayed allocated) | |
152 | * cluster. We use BH_AllocFromCluster only for this flag. BH_AllocFromCluster | |
153 | * should never appear on buffer_head's state flags. | |
154 | */ | |
155 | #define EXT4_MAP_FROM_CLUSTER (1 << BH_AllocFromCluster) | |
e35fd660 TT |
156 | #define EXT4_MAP_FLAGS (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\ |
157 | EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY |\ | |
7b415bf6 | 158 | EXT4_MAP_UNINIT | EXT4_MAP_FROM_CLUSTER) |
e35fd660 TT |
159 | |
160 | struct ext4_map_blocks { | |
161 | ext4_fsblk_t m_pblk; | |
162 | ext4_lblk_t m_lblk; | |
163 | unsigned int m_len; | |
164 | unsigned int m_flags; | |
165 | }; | |
166 | ||
b3a3ca8c TT |
167 | /* |
168 | * For delayed allocation tracking | |
169 | */ | |
170 | struct mpage_da_data { | |
171 | struct inode *inode; | |
172 | sector_t b_blocknr; /* start block number of extent */ | |
173 | size_t b_size; /* size of extent */ | |
174 | unsigned long b_state; /* state of the extent */ | |
175 | unsigned long first_page, next_page; /* extent of pages */ | |
176 | struct writeback_control *wbc; | |
177 | int io_done; | |
178 | int pages_written; | |
179 | int retval; | |
180 | }; | |
bd2d0210 TT |
181 | |
182 | /* | |
183 | * Flags for ext4_io_end->flags | |
184 | */ | |
185 | #define EXT4_IO_END_UNWRITTEN 0x0001 | |
186 | #define EXT4_IO_END_ERROR 0x0002 | |
8c0bec21 | 187 | #define EXT4_IO_END_QUEUED 0x0004 |
266991b1 | 188 | #define EXT4_IO_END_DIRECT 0x0008 |
491caa43 | 189 | #define EXT4_IO_END_IN_FSYNC 0x0010 |
bd2d0210 TT |
190 | |
191 | struct ext4_io_page { | |
192 | struct page *p_page; | |
83668e71 | 193 | atomic_t p_count; |
bd2d0210 TT |
194 | }; |
195 | ||
196 | #define MAX_IO_PAGES 128 | |
197 | ||
4188188b CW |
198 | /* |
199 | * For converting uninitialized extents on a work queue. | |
200 | * | |
201 | * 'page' is only used from the writepage() path; 'pages' is only used for | |
202 | * buffered writes; they are used to keep page references until conversion | |
203 | * takes place. For AIO/DIO, neither field is filled in. | |
204 | */ | |
0031462b | 205 | typedef struct ext4_io_end { |
5b3ff237 | 206 | struct list_head list; /* per-file finished IO list */ |
0031462b | 207 | struct inode *inode; /* file being written to */ |
8d5d02e6 | 208 | unsigned int flag; /* unwritten or not */ |
4188188b | 209 | struct page *page; /* for writepage() path */ |
a1de02dc ES |
210 | loff_t offset; /* offset in the file */ |
211 | ssize_t size; /* size of the extent */ | |
0031462b | 212 | struct work_struct work; /* data work queue */ |
5b3ff237 JZ |
213 | struct kiocb *iocb; /* iocb struct for AIO */ |
214 | int result; /* error value for AIO */ | |
4188188b CW |
215 | int num_io_pages; /* for writepages() */ |
216 | struct ext4_io_page *pages[MAX_IO_PAGES]; /* for writepages() */ | |
0031462b MC |
217 | } ext4_io_end_t; |
218 | ||
bd2d0210 TT |
219 | struct ext4_io_submit { |
220 | int io_op; | |
221 | struct bio *io_bio; | |
222 | ext4_io_end_t *io_end; | |
223 | struct ext4_io_page *io_page; | |
224 | sector_t io_next_block; | |
225 | }; | |
226 | ||
ac27a0ec DK |
227 | /* |
228 | * Special inodes numbers | |
229 | */ | |
617ba13b MC |
230 | #define EXT4_BAD_INO 1 /* Bad blocks inode */ |
231 | #define EXT4_ROOT_INO 2 /* Root inode */ | |
ae812306 AK |
232 | #define EXT4_USR_QUOTA_INO 3 /* User quota inode */ |
233 | #define EXT4_GRP_QUOTA_INO 4 /* Group quota inode */ | |
617ba13b MC |
234 | #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */ |
235 | #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */ | |
236 | #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */ | |
237 | #define EXT4_JOURNAL_INO 8 /* Journal inode */ | |
ac27a0ec | 238 | |
617ba13b MC |
239 | /* First non-reserved inode for old ext4 filesystems */ |
240 | #define EXT4_GOOD_OLD_FIRST_INO 11 | |
ac27a0ec DK |
241 | |
242 | /* | |
243 | * Maximal count of links to a file | |
244 | */ | |
f8628a14 | 245 | #define EXT4_LINK_MAX 65000 |
ac27a0ec DK |
246 | |
247 | /* | |
248 | * Macro-instructions used to manage several block sizes | |
249 | */ | |
617ba13b | 250 | #define EXT4_MIN_BLOCK_SIZE 1024 |
afc7cbca TS |
251 | #define EXT4_MAX_BLOCK_SIZE 65536 |
252 | #define EXT4_MIN_BLOCK_LOG_SIZE 10 | |
fb1813f4 | 253 | #define EXT4_MAX_BLOCK_LOG_SIZE 16 |
ac27a0ec | 254 | #ifdef __KERNEL__ |
617ba13b | 255 | # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize) |
ac27a0ec | 256 | #else |
617ba13b | 257 | # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size) |
ac27a0ec | 258 | #endif |
af5bc92d | 259 | #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32)) |
281b5995 TT |
260 | #define EXT4_CLUSTER_SIZE(s) (EXT4_BLOCK_SIZE(s) << \ |
261 | EXT4_SB(s)->s_cluster_bits) | |
ac27a0ec | 262 | #ifdef __KERNEL__ |
617ba13b | 263 | # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits) |
281b5995 | 264 | # define EXT4_CLUSTER_BITS(s) (EXT4_SB(s)->s_cluster_bits) |
ac27a0ec | 265 | #else |
617ba13b | 266 | # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10) |
ac27a0ec DK |
267 | #endif |
268 | #ifdef __KERNEL__ | |
617ba13b MC |
269 | #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits) |
270 | #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size) | |
271 | #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino) | |
ac27a0ec | 272 | #else |
617ba13b MC |
273 | #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ |
274 | EXT4_GOOD_OLD_INODE_SIZE : \ | |
ac27a0ec | 275 | (s)->s_inode_size) |
617ba13b MC |
276 | #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ |
277 | EXT4_GOOD_OLD_FIRST_INO : \ | |
ac27a0ec DK |
278 | (s)->s_first_ino) |
279 | #endif | |
a2df2a63 | 280 | #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits))) |
ac27a0ec | 281 | |
d5b8f310 TT |
282 | /* Translate a block number to a cluster number */ |
283 | #define EXT4_B2C(sbi, blk) ((blk) >> (sbi)->s_cluster_bits) | |
284 | /* Translate a cluster number to a block number */ | |
285 | #define EXT4_C2B(sbi, cluster) ((cluster) << (sbi)->s_cluster_bits) | |
286 | /* Translate # of blks to # of clusters */ | |
287 | #define EXT4_NUM_B2C(sbi, blks) (((blks) + (sbi)->s_cluster_ratio - 1) >> \ | |
288 | (sbi)->s_cluster_bits) | |
289 | ||
ac27a0ec DK |
290 | /* |
291 | * Structure of a blocks group descriptor | |
292 | */ | |
617ba13b | 293 | struct ext4_group_desc |
ac27a0ec | 294 | { |
3a14589c | 295 | __le32 bg_block_bitmap_lo; /* Blocks bitmap block */ |
5272f837 AK |
296 | __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */ |
297 | __le32 bg_inode_table_lo; /* Inodes table block */ | |
560671a0 AK |
298 | __le16 bg_free_blocks_count_lo;/* Free blocks count */ |
299 | __le16 bg_free_inodes_count_lo;/* Free inodes count */ | |
300 | __le16 bg_used_dirs_count_lo; /* Directories count */ | |
717d50e4 | 301 | __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */ |
e6153918 DW |
302 | __le32 bg_exclude_bitmap_lo; /* Exclude bitmap for snapshots */ |
303 | __le16 bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bbitmap) LE */ | |
304 | __le16 bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+ibitmap) LE */ | |
560671a0 | 305 | __le16 bg_itable_unused_lo; /* Unused inodes count */ |
717d50e4 | 306 | __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */ |
8fadc143 AR |
307 | __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */ |
308 | __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */ | |
309 | __le32 bg_inode_table_hi; /* Inodes table block MSB */ | |
91b51a01 CL |
310 | __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */ |
311 | __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */ | |
312 | __le16 bg_used_dirs_count_hi; /* Directories count MSB */ | |
560671a0 | 313 | __le16 bg_itable_unused_hi; /* Unused inodes count MSB */ |
e6153918 DW |
314 | __le32 bg_exclude_bitmap_hi; /* Exclude bitmap block MSB */ |
315 | __le16 bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bbitmap) BE */ | |
316 | __le16 bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+ibitmap) BE */ | |
317 | __u32 bg_reserved; | |
ac27a0ec DK |
318 | }; |
319 | ||
772cb7c8 JS |
320 | /* |
321 | * Structure of a flex block group info | |
322 | */ | |
323 | ||
324 | struct flex_groups { | |
9f24e420 | 325 | atomic_t free_inodes; |
24aaa8ef | 326 | atomic_t free_clusters; |
7d39db14 | 327 | atomic_t used_dirs; |
772cb7c8 JS |
328 | }; |
329 | ||
717d50e4 AD |
330 | #define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */ |
331 | #define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */ | |
332 | #define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */ | |
333 | ||
ac27a0ec DK |
334 | /* |
335 | * Macro-instructions used to manage group descriptors | |
336 | */ | |
0d1ee42f | 337 | #define EXT4_MIN_DESC_SIZE 32 |
8fadc143 | 338 | #define EXT4_MIN_DESC_SIZE_64BIT 64 |
0d1ee42f AR |
339 | #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE |
340 | #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size) | |
ac27a0ec | 341 | #ifdef __KERNEL__ |
617ba13b | 342 | # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group) |
281b5995 | 343 | # define EXT4_CLUSTERS_PER_GROUP(s) (EXT4_SB(s)->s_clusters_per_group) |
617ba13b MC |
344 | # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block) |
345 | # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group) | |
346 | # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits) | |
ac27a0ec | 347 | #else |
617ba13b | 348 | # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group) |
0d1ee42f | 349 | # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s)) |
617ba13b | 350 | # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group) |
ac27a0ec DK |
351 | #endif |
352 | ||
353 | /* | |
354 | * Constants relative to the data blocks | |
355 | */ | |
617ba13b MC |
356 | #define EXT4_NDIR_BLOCKS 12 |
357 | #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS | |
358 | #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1) | |
359 | #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1) | |
360 | #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1) | |
ac27a0ec DK |
361 | |
362 | /* | |
363 | * Inode flags | |
364 | */ | |
617ba13b MC |
365 | #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */ |
366 | #define EXT4_UNRM_FL 0x00000002 /* Undelete */ | |
367 | #define EXT4_COMPR_FL 0x00000004 /* Compress file */ | |
368 | #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */ | |
369 | #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */ | |
370 | #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */ | |
371 | #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */ | |
372 | #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */ | |
ac27a0ec | 373 | /* Reserved for compression usage... */ |
617ba13b MC |
374 | #define EXT4_DIRTY_FL 0x00000100 |
375 | #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ | |
376 | #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */ | |
377 | #define EXT4_ECOMPR_FL 0x00000800 /* Compression error */ | |
ac27a0ec | 378 | /* End compression flags --- maybe not all used */ |
617ba13b MC |
379 | #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */ |
380 | #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */ | |
381 | #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */ | |
382 | #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */ | |
383 | #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */ | |
384 | #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/ | |
8180a562 | 385 | #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */ |
a86c6181 | 386 | #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */ |
f710b4b9 | 387 | #define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */ |
c8d46e41 | 388 | #define EXT4_EOFBLOCKS_FL 0x00400000 /* Blocks allocated beyond EOF */ |
8180a562 | 389 | #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */ |
ac27a0ec | 390 | |
c8d46e41 JZ |
391 | #define EXT4_FL_USER_VISIBLE 0x004BDFFF /* User visible flags */ |
392 | #define EXT4_FL_USER_MODIFIABLE 0x004B80FF /* User modifiable flags */ | |
ac27a0ec | 393 | |
8fa43a81 DG |
394 | /* Flags that should be inherited by new inodes from their parent. */ |
395 | #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\ | |
1cd9f097 | 396 | EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\ |
8fa43a81 DG |
397 | EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\ |
398 | EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL) | |
399 | ||
2dc6b0d4 DG |
400 | /* Flags that are appropriate for regular files (all but dir-specific ones). */ |
401 | #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL)) | |
402 | ||
403 | /* Flags that are appropriate for non-directories/regular files. */ | |
404 | #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL) | |
405 | ||
406 | /* Mask out flags that are inappropriate for the given type of inode. */ | |
407 | static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags) | |
408 | { | |
409 | if (S_ISDIR(mode)) | |
410 | return flags; | |
411 | else if (S_ISREG(mode)) | |
412 | return flags & EXT4_REG_FLMASK; | |
413 | else | |
414 | return flags & EXT4_OTHER_FLMASK; | |
415 | } | |
416 | ||
12e9b892 DM |
417 | /* |
418 | * Inode flags used for atomic set/get | |
419 | */ | |
420 | enum { | |
421 | EXT4_INODE_SECRM = 0, /* Secure deletion */ | |
422 | EXT4_INODE_UNRM = 1, /* Undelete */ | |
423 | EXT4_INODE_COMPR = 2, /* Compress file */ | |
424 | EXT4_INODE_SYNC = 3, /* Synchronous updates */ | |
425 | EXT4_INODE_IMMUTABLE = 4, /* Immutable file */ | |
426 | EXT4_INODE_APPEND = 5, /* writes to file may only append */ | |
427 | EXT4_INODE_NODUMP = 6, /* do not dump file */ | |
428 | EXT4_INODE_NOATIME = 7, /* do not update atime */ | |
429 | /* Reserved for compression usage... */ | |
430 | EXT4_INODE_DIRTY = 8, | |
431 | EXT4_INODE_COMPRBLK = 9, /* One or more compressed clusters */ | |
432 | EXT4_INODE_NOCOMPR = 10, /* Don't compress */ | |
433 | EXT4_INODE_ECOMPR = 11, /* Compression error */ | |
434 | /* End compression flags --- maybe not all used */ | |
435 | EXT4_INODE_INDEX = 12, /* hash-indexed directory */ | |
436 | EXT4_INODE_IMAGIC = 13, /* AFS directory */ | |
437 | EXT4_INODE_JOURNAL_DATA = 14, /* file data should be journaled */ | |
438 | EXT4_INODE_NOTAIL = 15, /* file tail should not be merged */ | |
439 | EXT4_INODE_DIRSYNC = 16, /* dirsync behaviour (directories only) */ | |
440 | EXT4_INODE_TOPDIR = 17, /* Top of directory hierarchies*/ | |
441 | EXT4_INODE_HUGE_FILE = 18, /* Set to each huge file */ | |
442 | EXT4_INODE_EXTENTS = 19, /* Inode uses extents */ | |
443 | EXT4_INODE_EA_INODE = 21, /* Inode used for large EA */ | |
444 | EXT4_INODE_EOFBLOCKS = 22, /* Blocks allocated beyond EOF */ | |
445 | EXT4_INODE_RESERVED = 31, /* reserved for ext4 lib */ | |
446 | }; | |
447 | ||
448 | #define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG)) | |
449 | #define CHECK_FLAG_VALUE(FLAG) if (!TEST_FLAG_VALUE(FLAG)) { \ | |
450 | printk(KERN_EMERG "EXT4 flag fail: " #FLAG ": %d %d\n", \ | |
451 | EXT4_##FLAG##_FL, EXT4_INODE_##FLAG); BUG_ON(1); } | |
452 | ||
453 | /* | |
454 | * Since it's pretty easy to mix up bit numbers and hex values, and we | |
455 | * can't do a compile-time test for ENUM values, we use a run-time | |
456 | * test to make sure that EXT4_XXX_FL is consistent with respect to | |
457 | * EXT4_INODE_XXX. If all is well the printk and BUG_ON will all drop | |
458 | * out so it won't cost any extra space in the compiled kernel image. | |
459 | * But it's important that these values are the same, since we are | |
460 | * using EXT4_INODE_XXX to test for the flag values, but EXT4_XX_FL | |
461 | * must be consistent with the values of FS_XXX_FL defined in | |
462 | * include/linux/fs.h and the on-disk values found in ext2, ext3, and | |
463 | * ext4 filesystems, and of course the values defined in e2fsprogs. | |
464 | * | |
465 | * It's not paranoia if the Murphy's Law really *is* out to get you. :-) | |
466 | */ | |
467 | static inline void ext4_check_flag_values(void) | |
468 | { | |
469 | CHECK_FLAG_VALUE(SECRM); | |
470 | CHECK_FLAG_VALUE(UNRM); | |
471 | CHECK_FLAG_VALUE(COMPR); | |
472 | CHECK_FLAG_VALUE(SYNC); | |
473 | CHECK_FLAG_VALUE(IMMUTABLE); | |
474 | CHECK_FLAG_VALUE(APPEND); | |
475 | CHECK_FLAG_VALUE(NODUMP); | |
476 | CHECK_FLAG_VALUE(NOATIME); | |
477 | CHECK_FLAG_VALUE(DIRTY); | |
478 | CHECK_FLAG_VALUE(COMPRBLK); | |
479 | CHECK_FLAG_VALUE(NOCOMPR); | |
480 | CHECK_FLAG_VALUE(ECOMPR); | |
481 | CHECK_FLAG_VALUE(INDEX); | |
482 | CHECK_FLAG_VALUE(IMAGIC); | |
483 | CHECK_FLAG_VALUE(JOURNAL_DATA); | |
484 | CHECK_FLAG_VALUE(NOTAIL); | |
485 | CHECK_FLAG_VALUE(DIRSYNC); | |
486 | CHECK_FLAG_VALUE(TOPDIR); | |
487 | CHECK_FLAG_VALUE(HUGE_FILE); | |
488 | CHECK_FLAG_VALUE(EXTENTS); | |
489 | CHECK_FLAG_VALUE(EA_INODE); | |
490 | CHECK_FLAG_VALUE(EOFBLOCKS); | |
491 | CHECK_FLAG_VALUE(RESERVED); | |
492 | } | |
493 | ||
ac27a0ec | 494 | /* Used to pass group descriptor data when online resize is done */ |
617ba13b | 495 | struct ext4_new_group_input { |
8c55e204 DK |
496 | __u32 group; /* Group number for this data */ |
497 | __u64 block_bitmap; /* Absolute block number of block bitmap */ | |
498 | __u64 inode_bitmap; /* Absolute block number of inode bitmap */ | |
499 | __u64 inode_table; /* Absolute block number of inode table start */ | |
500 | __u32 blocks_count; /* Total number of blocks in this group */ | |
501 | __u16 reserved_blocks; /* Number of reserved blocks in this group */ | |
ac27a0ec DK |
502 | __u16 unused; |
503 | }; | |
504 | ||
4d92dc0f BH |
505 | #if defined(__KERNEL__) && defined(CONFIG_COMPAT) |
506 | struct compat_ext4_new_group_input { | |
507 | u32 group; | |
508 | compat_u64 block_bitmap; | |
509 | compat_u64 inode_bitmap; | |
510 | compat_u64 inode_table; | |
511 | u32 blocks_count; | |
512 | u16 reserved_blocks; | |
513 | u16 unused; | |
514 | }; | |
515 | #endif | |
516 | ||
617ba13b MC |
517 | /* The struct ext4_new_group_input in kernel space, with free_blocks_count */ |
518 | struct ext4_new_group_data { | |
ac27a0ec | 519 | __u32 group; |
bd81d8ee LV |
520 | __u64 block_bitmap; |
521 | __u64 inode_bitmap; | |
522 | __u64 inode_table; | |
ac27a0ec DK |
523 | __u32 blocks_count; |
524 | __u16 reserved_blocks; | |
525 | __u16 unused; | |
526 | __u32 free_blocks_count; | |
527 | }; | |
528 | ||
33afdcc5 YY |
529 | /* Indexes used to index group tables in ext4_new_group_data */ |
530 | enum { | |
531 | BLOCK_BITMAP = 0, /* block bitmap */ | |
532 | INODE_BITMAP, /* inode bitmap */ | |
533 | INODE_TABLE, /* inode tables */ | |
534 | GROUP_TABLE_COUNT, | |
535 | }; | |
536 | ||
a2df2a63 | 537 | /* |
79e83036 | 538 | * Flags used by ext4_map_blocks() |
a2df2a63 | 539 | */ |
c2177057 TT |
540 | /* Allocate any needed blocks and/or convert an unitialized |
541 | extent to be an initialized ext4 */ | |
2ac3b6e0 | 542 | #define EXT4_GET_BLOCKS_CREATE 0x0001 |
c2177057 | 543 | /* Request the creation of an unitialized extent */ |
2ac3b6e0 | 544 | #define EXT4_GET_BLOCKS_UNINIT_EXT 0x0002 |
c2177057 TT |
545 | #define EXT4_GET_BLOCKS_CREATE_UNINIT_EXT (EXT4_GET_BLOCKS_UNINIT_EXT|\ |
546 | EXT4_GET_BLOCKS_CREATE) | |
c2177057 | 547 | /* Caller is from the delayed allocation writeout path, |
60e6679e | 548 | so set the magic i_delalloc_reserve_flag after taking the |
2ac3b6e0 | 549 | inode allocation semaphore for */ |
03f5d8bc | 550 | #define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004 |
0031462b MC |
551 | /* caller is from the direct IO path, request to creation of an |
552 | unitialized extents if not allocated, split the uninitialized | |
553 | extent if blocks has been preallocated already*/ | |
c7064ef1 | 554 | #define EXT4_GET_BLOCKS_PRE_IO 0x0008 |
1296cc85 | 555 | #define EXT4_GET_BLOCKS_CONVERT 0x0010 |
c7064ef1 | 556 | #define EXT4_GET_BLOCKS_IO_CREATE_EXT (EXT4_GET_BLOCKS_PRE_IO|\ |
0031462b | 557 | EXT4_GET_BLOCKS_CREATE_UNINIT_EXT) |
c7064ef1 JZ |
558 | /* Convert extent to initialized after IO complete */ |
559 | #define EXT4_GET_BLOCKS_IO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT|\ | |
0031462b | 560 | EXT4_GET_BLOCKS_CREATE_UNINIT_EXT) |
55f020db AH |
561 | /* Punch out blocks of an extent */ |
562 | #define EXT4_GET_BLOCKS_PUNCH_OUT_EXT 0x0020 | |
556b27ab VH |
563 | /* Don't normalize allocation size (used for fallocate) */ |
564 | #define EXT4_GET_BLOCKS_NO_NORMALIZE 0x0040 | |
a4e5d88b DM |
565 | /* Request will not result in inode size update (user for fallocate) */ |
566 | #define EXT4_GET_BLOCKS_KEEP_SIZE 0x0080 | |
ac27a0ec | 567 | |
e6362609 TT |
568 | /* |
569 | * Flags used by ext4_free_blocks | |
570 | */ | |
571 | #define EXT4_FREE_BLOCKS_METADATA 0x0001 | |
572 | #define EXT4_FREE_BLOCKS_FORGET 0x0002 | |
1f2acb60 | 573 | #define EXT4_FREE_BLOCKS_VALIDATED 0x0004 |
7132de74 | 574 | #define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE 0x0008 |
84130193 TT |
575 | #define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER 0x0010 |
576 | #define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER 0x0020 | |
e6362609 | 577 | |
4e96b2db AH |
578 | /* |
579 | * Flags used by ext4_discard_partial_page_buffers | |
580 | */ | |
581 | #define EXT4_DISCARD_PARTIAL_PG_ZERO_UNMAPPED 0x0001 | |
e6362609 | 582 | |
ac27a0ec DK |
583 | /* |
584 | * ioctl commands | |
585 | */ | |
617ba13b MC |
586 | #define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS |
587 | #define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS | |
588 | #define EXT4_IOC_GETVERSION _IOR('f', 3, long) | |
589 | #define EXT4_IOC_SETVERSION _IOW('f', 4, long) | |
617ba13b MC |
590 | #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION |
591 | #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION | |
617ba13b MC |
592 | #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long) |
593 | #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long) | |
8eea80d5 TT |
594 | #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long) |
595 | #define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input) | |
596 | #define EXT4_IOC_MIGRATE _IO('f', 9) | |
ccd2506b | 597 | /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */ |
8eea80d5 | 598 | /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */ |
ccd2506b | 599 | #define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12) |
748de673 | 600 | #define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent) |
19c5246d | 601 | #define EXT4_IOC_RESIZE_FS _IOW('f', 16, __u64) |
ac27a0ec | 602 | |
899ad0ce | 603 | #if defined(__KERNEL__) && defined(CONFIG_COMPAT) |
ac27a0ec DK |
604 | /* |
605 | * ioctl commands in 32 bit emulation | |
606 | */ | |
617ba13b MC |
607 | #define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS |
608 | #define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS | |
609 | #define EXT4_IOC32_GETVERSION _IOR('f', 3, int) | |
610 | #define EXT4_IOC32_SETVERSION _IOW('f', 4, int) | |
611 | #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int) | |
612 | #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int) | |
613 | #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int) | |
4d92dc0f | 614 | #define EXT4_IOC32_GROUP_ADD _IOW('f', 8, struct compat_ext4_new_group_input) |
617ba13b MC |
615 | #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION |
616 | #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION | |
899ad0ce | 617 | #endif |
ac27a0ec | 618 | |
b595076a | 619 | /* Max physical block we can address w/o extents */ |
fb0a387d ES |
620 | #define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF |
621 | ||
ac27a0ec DK |
622 | /* |
623 | * Structure of an inode on the disk | |
624 | */ | |
617ba13b | 625 | struct ext4_inode { |
ac27a0ec DK |
626 | __le16 i_mode; /* File mode */ |
627 | __le16 i_uid; /* Low 16 bits of Owner Uid */ | |
a48380f7 | 628 | __le32 i_size_lo; /* Size in bytes */ |
ac27a0ec | 629 | __le32 i_atime; /* Access time */ |
ef7f3835 | 630 | __le32 i_ctime; /* Inode Change time */ |
ac27a0ec DK |
631 | __le32 i_mtime; /* Modification time */ |
632 | __le32 i_dtime; /* Deletion Time */ | |
633 | __le16 i_gid; /* Low 16 bits of Group Id */ | |
634 | __le16 i_links_count; /* Links count */ | |
0fc1b451 | 635 | __le32 i_blocks_lo; /* Blocks count */ |
ac27a0ec DK |
636 | __le32 i_flags; /* File flags */ |
637 | union { | |
638 | struct { | |
25ec56b5 | 639 | __le32 l_i_version; |
ac27a0ec DK |
640 | } linux1; |
641 | struct { | |
642 | __u32 h_i_translator; | |
643 | } hurd1; | |
644 | struct { | |
645 | __u32 m_i_reserved1; | |
646 | } masix1; | |
647 | } osd1; /* OS dependent 1 */ | |
617ba13b | 648 | __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */ |
ac27a0ec | 649 | __le32 i_generation; /* File version (for NFS) */ |
7973c0c1 | 650 | __le32 i_file_acl_lo; /* File ACL */ |
a48380f7 | 651 | __le32 i_size_high; |
f077d0d7 | 652 | __le32 i_obso_faddr; /* Obsoleted fragment address */ |
ac27a0ec DK |
653 | union { |
654 | struct { | |
0fc1b451 | 655 | __le16 l_i_blocks_high; /* were l_i_reserved1 */ |
a1ddeb7e | 656 | __le16 l_i_file_acl_high; |
8c55e204 | 657 | __le16 l_i_uid_high; /* these 2 fields */ |
ac27a0ec | 658 | __le16 l_i_gid_high; /* were reserved2[0] */ |
e6153918 DW |
659 | __le16 l_i_checksum_lo;/* crc32c(uuid+inum+inode) LE */ |
660 | __le16 l_i_reserved; | |
ac27a0ec DK |
661 | } linux2; |
662 | struct { | |
f077d0d7 | 663 | __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ |
ac27a0ec DK |
664 | __u16 h_i_mode_high; |
665 | __u16 h_i_uid_high; | |
666 | __u16 h_i_gid_high; | |
667 | __u32 h_i_author; | |
668 | } hurd2; | |
669 | struct { | |
f077d0d7 | 670 | __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ |
a1ddeb7e | 671 | __le16 m_i_file_acl_high; |
ac27a0ec DK |
672 | __u32 m_i_reserved2[2]; |
673 | } masix2; | |
674 | } osd2; /* OS dependent 2 */ | |
675 | __le16 i_extra_isize; | |
e6153918 | 676 | __le16 i_checksum_hi; /* crc32c(uuid+inum+inode) BE */ |
ef7f3835 KS |
677 | __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */ |
678 | __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */ | |
679 | __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */ | |
680 | __le32 i_crtime; /* File Creation time */ | |
681 | __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */ | |
25ec56b5 | 682 | __le32 i_version_hi; /* high 32 bits for 64-bit version */ |
ac27a0ec DK |
683 | }; |
684 | ||
748de673 AF |
685 | struct move_extent { |
686 | __u32 reserved; /* should be zero */ | |
687 | __u32 donor_fd; /* donor file descriptor */ | |
688 | __u64 orig_start; /* logical start offset in block for orig */ | |
689 | __u64 donor_start; /* logical start offset in block for donor */ | |
690 | __u64 len; /* block length to be moved */ | |
691 | __u64 moved_len; /* moved block length */ | |
692 | }; | |
ac27a0ec | 693 | |
ef7f3835 KS |
694 | #define EXT4_EPOCH_BITS 2 |
695 | #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1) | |
696 | #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS) | |
697 | ||
698 | /* | |
699 | * Extended fields will fit into an inode if the filesystem was formatted | |
700 | * with large inodes (-I 256 or larger) and there are not currently any EAs | |
701 | * consuming all of the available space. For new inodes we always reserve | |
702 | * enough space for the kernel's known extended fields, but for inodes | |
703 | * created with an old kernel this might not have been the case. None of | |
704 | * the extended inode fields is critical for correct filesystem operation. | |
705 | * This macro checks if a certain field fits in the inode. Note that | |
706 | * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize | |
707 | */ | |
708 | #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \ | |
709 | ((offsetof(typeof(*ext4_inode), field) + \ | |
710 | sizeof((ext4_inode)->field)) \ | |
711 | <= (EXT4_GOOD_OLD_INODE_SIZE + \ | |
712 | (einode)->i_extra_isize)) \ | |
713 | ||
714 | static inline __le32 ext4_encode_extra_time(struct timespec *time) | |
715 | { | |
716 | return cpu_to_le32((sizeof(time->tv_sec) > 4 ? | |
c1fccc06 TT |
717 | (time->tv_sec >> 32) & EXT4_EPOCH_MASK : 0) | |
718 | ((time->tv_nsec << EXT4_EPOCH_BITS) & EXT4_NSEC_MASK)); | |
ef7f3835 KS |
719 | } |
720 | ||
721 | static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra) | |
722 | { | |
723 | if (sizeof(time->tv_sec) > 4) | |
724 | time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) | |
725 | << 32; | |
c1fccc06 | 726 | time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS; |
ef7f3835 KS |
727 | } |
728 | ||
729 | #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \ | |
730 | do { \ | |
731 | (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \ | |
732 | if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \ | |
733 | (raw_inode)->xtime ## _extra = \ | |
734 | ext4_encode_extra_time(&(inode)->xtime); \ | |
735 | } while (0) | |
736 | ||
737 | #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \ | |
738 | do { \ | |
739 | if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ | |
740 | (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \ | |
741 | if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ | |
742 | (raw_inode)->xtime ## _extra = \ | |
743 | ext4_encode_extra_time(&(einode)->xtime); \ | |
744 | } while (0) | |
745 | ||
746 | #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \ | |
747 | do { \ | |
748 | (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \ | |
749 | if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \ | |
750 | ext4_decode_extra_time(&(inode)->xtime, \ | |
751 | raw_inode->xtime ## _extra); \ | |
af0b44a1 ES |
752 | else \ |
753 | (inode)->xtime.tv_nsec = 0; \ | |
ef7f3835 KS |
754 | } while (0) |
755 | ||
756 | #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \ | |
757 | do { \ | |
758 | if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ | |
759 | (einode)->xtime.tv_sec = \ | |
760 | (signed)le32_to_cpu((raw_inode)->xtime); \ | |
761 | if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ | |
762 | ext4_decode_extra_time(&(einode)->xtime, \ | |
763 | raw_inode->xtime ## _extra); \ | |
af0b44a1 ES |
764 | else \ |
765 | (einode)->xtime.tv_nsec = 0; \ | |
ef7f3835 KS |
766 | } while (0) |
767 | ||
25ec56b5 JNC |
768 | #define i_disk_version osd1.linux1.l_i_version |
769 | ||
ac27a0ec DK |
770 | #if defined(__KERNEL__) || defined(__linux__) |
771 | #define i_reserved1 osd1.linux1.l_i_reserved1 | |
a1ddeb7e | 772 | #define i_file_acl_high osd2.linux2.l_i_file_acl_high |
0fc1b451 | 773 | #define i_blocks_high osd2.linux2.l_i_blocks_high |
ac27a0ec DK |
774 | #define i_uid_low i_uid |
775 | #define i_gid_low i_gid | |
776 | #define i_uid_high osd2.linux2.l_i_uid_high | |
777 | #define i_gid_high osd2.linux2.l_i_gid_high | |
e6153918 | 778 | #define i_checksum_lo osd2.linux2.l_i_checksum_lo |
ac27a0ec DK |
779 | |
780 | #elif defined(__GNU__) | |
781 | ||
782 | #define i_translator osd1.hurd1.h_i_translator | |
ac27a0ec DK |
783 | #define i_uid_high osd2.hurd2.h_i_uid_high |
784 | #define i_gid_high osd2.hurd2.h_i_gid_high | |
785 | #define i_author osd2.hurd2.h_i_author | |
786 | ||
787 | #elif defined(__masix__) | |
788 | ||
789 | #define i_reserved1 osd1.masix1.m_i_reserved1 | |
a1ddeb7e | 790 | #define i_file_acl_high osd2.masix2.m_i_file_acl_high |
ac27a0ec DK |
791 | #define i_reserved2 osd2.masix2.m_i_reserved2 |
792 | ||
793 | #endif /* defined(__KERNEL__) || defined(__linux__) */ | |
794 | ||
d444c3c3 TT |
795 | /* |
796 | * storage for cached extent | |
b05e6ae5 TT |
797 | * If ec_len == 0, then the cache is invalid. |
798 | * If ec_start == 0, then the cache represents a gap (null mapping) | |
d444c3c3 TT |
799 | */ |
800 | struct ext4_ext_cache { | |
801 | ext4_fsblk_t ec_start; | |
802 | ext4_lblk_t ec_block; | |
803 | __u32 ec_len; /* must be 32bit to return holes */ | |
d444c3c3 TT |
804 | }; |
805 | ||
806 | /* | |
807 | * fourth extended file system inode data in memory | |
808 | */ | |
809 | struct ext4_inode_info { | |
810 | __le32 i_data[15]; /* unconverted */ | |
d444c3c3 | 811 | __u32 i_dtime; |
12e9b892 | 812 | ext4_fsblk_t i_file_acl; |
d444c3c3 TT |
813 | |
814 | /* | |
815 | * i_block_group is the number of the block group which contains | |
816 | * this file's inode. Constant across the lifetime of the inode, | |
817 | * it is ued for making block allocation decisions - we try to | |
818 | * place a file's data blocks near its inode block, and new inodes | |
819 | * near to their parent directory's inode. | |
820 | */ | |
821 | ext4_group_t i_block_group; | |
8a2005d3 | 822 | ext4_lblk_t i_dir_start_lookup; |
353eb83c | 823 | #if (BITS_PER_LONG < 64) |
19f5fb7a | 824 | unsigned long i_state_flags; /* Dynamic state flags */ |
353eb83c | 825 | #endif |
12e9b892 | 826 | unsigned long i_flags; |
d444c3c3 | 827 | |
d444c3c3 TT |
828 | #ifdef CONFIG_EXT4_FS_XATTR |
829 | /* | |
830 | * Extended attributes can be read independently of the main file | |
831 | * data. Taking i_mutex even when reading would cause contention | |
832 | * between readers of EAs and writers of regular file data, so | |
833 | * instead we synchronize on xattr_sem when reading or changing | |
834 | * EAs. | |
835 | */ | |
836 | struct rw_semaphore xattr_sem; | |
837 | #endif | |
d444c3c3 TT |
838 | |
839 | struct list_head i_orphan; /* unlinked but open inodes */ | |
840 | ||
841 | /* | |
842 | * i_disksize keeps track of what the inode size is ON DISK, not | |
843 | * in memory. During truncate, i_size is set to the new size by | |
844 | * the VFS prior to calling ext4_truncate(), but the filesystem won't | |
845 | * set i_disksize to 0 until the truncate is actually under way. | |
846 | * | |
847 | * The intent is that i_disksize always represents the blocks which | |
848 | * are used by this file. This allows recovery to restart truncate | |
849 | * on orphans if we crash during truncate. We actually write i_disksize | |
850 | * into the on-disk inode when writing inodes out, instead of i_size. | |
851 | * | |
852 | * The only time when i_disksize and i_size may be different is when | |
853 | * a truncate is in progress. The only things which change i_disksize | |
854 | * are ext4_get_block (growth) and ext4_truncate (shrinkth). | |
855 | */ | |
856 | loff_t i_disksize; | |
857 | ||
858 | /* | |
859 | * i_data_sem is for serialising ext4_truncate() against | |
860 | * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's | |
861 | * data tree are chopped off during truncate. We can't do that in | |
862 | * ext4 because whenever we perform intermediate commits during | |
863 | * truncate, the inode and all the metadata blocks *must* be in a | |
864 | * consistent state which allows truncation of the orphans to restart | |
865 | * during recovery. Hence we must fix the get_block-vs-truncate race | |
866 | * by other means, so we have i_data_sem. | |
867 | */ | |
868 | struct rw_semaphore i_data_sem; | |
869 | struct inode vfs_inode; | |
8aefcd55 | 870 | struct jbd2_inode *jinode; |
d444c3c3 TT |
871 | |
872 | struct ext4_ext_cache i_cached_extent; | |
873 | /* | |
874 | * File creation time. Its function is same as that of | |
875 | * struct timespec i_{a,c,m}time in the generic inode. | |
876 | */ | |
877 | struct timespec i_crtime; | |
878 | ||
879 | /* mballoc */ | |
880 | struct list_head i_prealloc_list; | |
881 | spinlock_t i_prealloc_lock; | |
882 | ||
883 | /* ialloc */ | |
884 | ext4_group_t i_last_alloc_group; | |
885 | ||
886 | /* allocation reservation info for delalloc */ | |
57042651 | 887 | /* In case of bigalloc, these refer to clusters rather than blocks */ |
d444c3c3 TT |
888 | unsigned int i_reserved_data_blocks; |
889 | unsigned int i_reserved_meta_blocks; | |
890 | unsigned int i_allocated_meta_blocks; | |
01f49d0b | 891 | ext4_lblk_t i_da_metadata_calc_last_lblock; |
9d0be502 | 892 | int i_da_metadata_calc_len; |
d444c3c3 TT |
893 | |
894 | /* on-disk additional length */ | |
895 | __u16 i_extra_isize; | |
896 | ||
a9e7f447 DM |
897 | #ifdef CONFIG_QUOTA |
898 | /* quota space reservation, managed internally by quota code */ | |
899 | qsize_t i_reserved_quota; | |
900 | #endif | |
8d5d02e6 | 901 | |
c7064ef1 JZ |
902 | /* completed IOs that might need unwritten extents handling */ |
903 | struct list_head i_completed_io_list; | |
744692dc | 904 | spinlock_t i_completed_io_lock; |
8a2005d3 | 905 | atomic_t i_ioend_count; /* Number of outstanding io_end structs */ |
8d5d02e6 MC |
906 | /* current io_end structure for async DIO write*/ |
907 | ext4_io_end_t *cur_aio_dio; | |
e9e3bcec | 908 | atomic_t i_aiodio_unwritten; /* Nr. of inflight conversions pending */ |
8a2005d3 TT |
909 | |
910 | spinlock_t i_block_reservation_lock; | |
b436b9be JK |
911 | |
912 | /* | |
913 | * Transactions that contain inode's metadata needed to complete | |
914 | * fsync and fdatasync, respectively. | |
915 | */ | |
916 | tid_t i_sync_tid; | |
917 | tid_t i_datasync_tid; | |
814525f4 DW |
918 | |
919 | /* Precomputed uuid+inum+igen checksum for seeding inode checksums */ | |
920 | __u32 i_csum_seed; | |
d444c3c3 TT |
921 | }; |
922 | ||
ac27a0ec DK |
923 | /* |
924 | * File system states | |
925 | */ | |
617ba13b MC |
926 | #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */ |
927 | #define EXT4_ERROR_FS 0x0002 /* Errors detected */ | |
928 | #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */ | |
ac27a0ec | 929 | |
469108ff TT |
930 | /* |
931 | * Misc. filesystem flags | |
932 | */ | |
933 | #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */ | |
934 | #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */ | |
935 | #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */ | |
936 | ||
ac27a0ec DK |
937 | /* |
938 | * Mount flags | |
939 | */ | |
617ba13b MC |
940 | #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */ |
941 | #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */ | |
942 | #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */ | |
943 | #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */ | |
944 | #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */ | |
39ef17f1 | 945 | #define EXT4_MOUNT_ERRORS_MASK 0x00070 |
617ba13b MC |
946 | #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */ |
947 | #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/ | |
617ba13b MC |
948 | #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */ |
949 | #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */ | |
950 | #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */ | |
951 | #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */ | |
952 | #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */ | |
953 | #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */ | |
954 | #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */ | |
955 | #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */ | |
afd4672d | 956 | #define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */ |
617ba13b | 957 | #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */ |
617ba13b MC |
958 | #define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */ |
959 | #define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */ | |
960 | #define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */ | |
744692dc | 961 | #define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000 /* Enable support for dio read nolocking */ |
d4da6c9c | 962 | #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */ |
818d276c | 963 | #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */ |
1449032b | 964 | #define EXT4_MOUNT_MBLK_IO_SUBMIT 0x4000000 /* multi-block io submits */ |
64769240 | 965 | #define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */ |
5bf5683a | 966 | #define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */ |
6fd058f7 | 967 | #define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */ |
5328e635 | 968 | #define EXT4_MOUNT_DISCARD 0x40000000 /* Issue DISCARD requests */ |
bfff6873 | 969 | #define EXT4_MOUNT_INIT_INODE_TABLE 0x80000000 /* Initialize uninitialized itables */ |
5bf5683a | 970 | |
56889787 TT |
971 | #define EXT4_MOUNT2_EXPLICIT_DELALLOC 0x00000001 /* User explicitly |
972 | specified delalloc */ | |
973 | ||
fd8c37ec TT |
974 | #define clear_opt(sb, opt) EXT4_SB(sb)->s_mount_opt &= \ |
975 | ~EXT4_MOUNT_##opt | |
976 | #define set_opt(sb, opt) EXT4_SB(sb)->s_mount_opt |= \ | |
977 | EXT4_MOUNT_##opt | |
617ba13b MC |
978 | #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \ |
979 | EXT4_MOUNT_##opt) | |
ac27a0ec | 980 | |
a2595b8a TT |
981 | #define clear_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 &= \ |
982 | ~EXT4_MOUNT2_##opt | |
983 | #define set_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 |= \ | |
984 | EXT4_MOUNT2_##opt | |
985 | #define test_opt2(sb, opt) (EXT4_SB(sb)->s_mount_opt2 & \ | |
986 | EXT4_MOUNT2_##opt) | |
987 | ||
597d508c AM |
988 | #define ext4_test_and_set_bit __test_and_set_bit_le |
989 | #define ext4_set_bit __set_bit_le | |
617ba13b | 990 | #define ext4_set_bit_atomic ext2_set_bit_atomic |
597d508c AM |
991 | #define ext4_test_and_clear_bit __test_and_clear_bit_le |
992 | #define ext4_clear_bit __clear_bit_le | |
617ba13b | 993 | #define ext4_clear_bit_atomic ext2_clear_bit_atomic |
50e0168c | 994 | #define ext4_test_bit test_bit_le |
50e0168c AM |
995 | #define ext4_find_next_zero_bit find_next_zero_bit_le |
996 | #define ext4_find_next_bit find_next_bit_le | |
ac27a0ec | 997 | |
c3e94d1d YY |
998 | extern void ext4_set_bits(void *bm, int cur, int len); |
999 | ||
ac27a0ec DK |
1000 | /* |
1001 | * Maximal mount counts between two filesystem checks | |
1002 | */ | |
617ba13b MC |
1003 | #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ |
1004 | #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */ | |
ac27a0ec DK |
1005 | |
1006 | /* | |
1007 | * Behaviour when detecting errors | |
1008 | */ | |
617ba13b MC |
1009 | #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */ |
1010 | #define EXT4_ERRORS_RO 2 /* Remount fs read-only */ | |
1011 | #define EXT4_ERRORS_PANIC 3 /* Panic */ | |
1012 | #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE | |
ac27a0ec | 1013 | |
e6153918 DW |
1014 | /* Metadata checksum algorithm codes */ |
1015 | #define EXT4_CRC32C_CHKSUM 1 | |
1016 | ||
ac27a0ec DK |
1017 | /* |
1018 | * Structure of the super block | |
1019 | */ | |
617ba13b | 1020 | struct ext4_super_block { |
ac27a0ec | 1021 | /*00*/ __le32 s_inodes_count; /* Inodes count */ |
6bc9feff | 1022 | __le32 s_blocks_count_lo; /* Blocks count */ |
308ba3ec AK |
1023 | __le32 s_r_blocks_count_lo; /* Reserved blocks count */ |
1024 | __le32 s_free_blocks_count_lo; /* Free blocks count */ | |
ac27a0ec DK |
1025 | /*10*/ __le32 s_free_inodes_count; /* Free inodes count */ |
1026 | __le32 s_first_data_block; /* First Data Block */ | |
1027 | __le32 s_log_block_size; /* Block size */ | |
281b5995 | 1028 | __le32 s_log_cluster_size; /* Allocation cluster size */ |
ac27a0ec | 1029 | /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */ |
281b5995 | 1030 | __le32 s_clusters_per_group; /* # Clusters per group */ |
ac27a0ec DK |
1031 | __le32 s_inodes_per_group; /* # Inodes per group */ |
1032 | __le32 s_mtime; /* Mount time */ | |
1033 | /*30*/ __le32 s_wtime; /* Write time */ | |
1034 | __le16 s_mnt_count; /* Mount count */ | |
1035 | __le16 s_max_mnt_count; /* Maximal mount count */ | |
1036 | __le16 s_magic; /* Magic signature */ | |
1037 | __le16 s_state; /* File system state */ | |
1038 | __le16 s_errors; /* Behaviour when detecting errors */ | |
1039 | __le16 s_minor_rev_level; /* minor revision level */ | |
1040 | /*40*/ __le32 s_lastcheck; /* time of last check */ | |
1041 | __le32 s_checkinterval; /* max. time between checks */ | |
1042 | __le32 s_creator_os; /* OS */ | |
1043 | __le32 s_rev_level; /* Revision level */ | |
1044 | /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */ | |
1045 | __le16 s_def_resgid; /* Default gid for reserved blocks */ | |
1046 | /* | |
617ba13b | 1047 | * These fields are for EXT4_DYNAMIC_REV superblocks only. |
ac27a0ec DK |
1048 | * |
1049 | * Note: the difference between the compatible feature set and | |
1050 | * the incompatible feature set is that if there is a bit set | |
1051 | * in the incompatible feature set that the kernel doesn't | |
1052 | * know about, it should refuse to mount the filesystem. | |
1053 | * | |
1054 | * e2fsck's requirements are more strict; if it doesn't know | |
1055 | * about a feature in either the compatible or incompatible | |
1056 | * feature set, it must abort and not try to meddle with | |
1057 | * things it doesn't understand... | |
1058 | */ | |
1059 | __le32 s_first_ino; /* First non-reserved inode */ | |
0d1ee42f | 1060 | __le16 s_inode_size; /* size of inode structure */ |
ac27a0ec DK |
1061 | __le16 s_block_group_nr; /* block group # of this superblock */ |
1062 | __le32 s_feature_compat; /* compatible feature set */ | |
1063 | /*60*/ __le32 s_feature_incompat; /* incompatible feature set */ | |
1064 | __le32 s_feature_ro_compat; /* readonly-compatible feature set */ | |
1065 | /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */ | |
1066 | /*78*/ char s_volume_name[16]; /* volume name */ | |
1067 | /*88*/ char s_last_mounted[64]; /* directory where last mounted */ | |
1068 | /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */ | |
1069 | /* | |
1070 | * Performance hints. Directory preallocation should only | |
617ba13b | 1071 | * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on. |
ac27a0ec DK |
1072 | */ |
1073 | __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ | |
1074 | __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ | |
1075 | __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */ | |
1076 | /* | |
617ba13b | 1077 | * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set. |
ac27a0ec DK |
1078 | */ |
1079 | /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */ | |
1080 | /*E0*/ __le32 s_journal_inum; /* inode number of journal file */ | |
1081 | __le32 s_journal_dev; /* device number of journal file */ | |
1082 | __le32 s_last_orphan; /* start of list of inodes to delete */ | |
1083 | __le32 s_hash_seed[4]; /* HTREE hash seed */ | |
1084 | __u8 s_def_hash_version; /* Default hash version to use */ | |
89eeddf0 | 1085 | __u8 s_jnl_backup_type; |
0d1ee42f | 1086 | __le16 s_desc_size; /* size of group descriptor */ |
bd81d8ee | 1087 | /*100*/ __le32 s_default_mount_opts; |
ac27a0ec | 1088 | __le32 s_first_meta_bg; /* First metablock block group */ |
bd81d8ee LV |
1089 | __le32 s_mkfs_time; /* When the filesystem was created */ |
1090 | __le32 s_jnl_blocks[17]; /* Backup of the journal inode */ | |
1091 | /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */ | |
1092 | /*150*/ __le32 s_blocks_count_hi; /* Blocks count */ | |
1093 | __le32 s_r_blocks_count_hi; /* Reserved blocks count */ | |
1094 | __le32 s_free_blocks_count_hi; /* Free blocks count */ | |
c1bddad9 AK |
1095 | __le16 s_min_extra_isize; /* All inodes have at least # bytes */ |
1096 | __le16 s_want_extra_isize; /* New inodes should reserve # bytes */ | |
1097 | __le32 s_flags; /* Miscellaneous flags */ | |
1098 | __le16 s_raid_stride; /* RAID stride */ | |
c5e06d10 | 1099 | __le16 s_mmp_update_interval; /* # seconds to wait in MMP checking */ |
c1bddad9 AK |
1100 | __le64 s_mmp_block; /* Block for multi-mount protection */ |
1101 | __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/ | |
772cb7c8 | 1102 | __u8 s_log_groups_per_flex; /* FLEX_BG group size */ |
e6153918 | 1103 | __u8 s_checksum_type; /* metadata checksum algorithm used */ |
772cb7c8 | 1104 | __le16 s_reserved_pad; |
afc32f7e | 1105 | __le64 s_kbytes_written; /* nr of lifetime kilobytes written */ |
4a9cdec7 TT |
1106 | __le32 s_snapshot_inum; /* Inode number of active snapshot */ |
1107 | __le32 s_snapshot_id; /* sequential ID of active snapshot */ | |
1108 | __le64 s_snapshot_r_blocks_count; /* reserved blocks for active | |
1109 | snapshot's future use */ | |
1110 | __le32 s_snapshot_list; /* inode number of the head of the | |
1111 | on-disk snapshot list */ | |
1c13d5c0 TT |
1112 | #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count) |
1113 | __le32 s_error_count; /* number of fs errors */ | |
1114 | __le32 s_first_error_time; /* first time an error happened */ | |
1115 | __le32 s_first_error_ino; /* inode involved in first error */ | |
1116 | __le64 s_first_error_block; /* block involved of first error */ | |
1117 | __u8 s_first_error_func[32]; /* function where the error happened */ | |
1118 | __le32 s_first_error_line; /* line number where error happened */ | |
1119 | __le32 s_last_error_time; /* most recent time of an error */ | |
1120 | __le32 s_last_error_ino; /* inode involved in last error */ | |
1121 | __le32 s_last_error_line; /* line number where error happened */ | |
1122 | __le64 s_last_error_block; /* block involved of last error */ | |
1123 | __u8 s_last_error_func[32]; /* function where the error happened */ | |
8b67f04a TT |
1124 | #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts) |
1125 | __u8 s_mount_opts[64]; | |
281b5995 TT |
1126 | __le32 s_usr_quota_inum; /* inode for tracking user quota */ |
1127 | __le32 s_grp_quota_inum; /* inode for tracking group quota */ | |
1128 | __le32 s_overhead_clusters; /* overhead blocks/clusters in fs */ | |
e6153918 DW |
1129 | __le32 s_reserved[108]; /* Padding to the end of the block */ |
1130 | __le32 s_checksum; /* crc32c(superblock) */ | |
ac27a0ec DK |
1131 | }; |
1132 | ||
1c13d5c0 TT |
1133 | #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START) |
1134 | ||
ac27a0ec | 1135 | #ifdef __KERNEL__ |
bc0b0d6d TT |
1136 | |
1137 | /* | |
4ab2f15b | 1138 | * run-time mount flags |
bc0b0d6d TT |
1139 | */ |
1140 | #define EXT4_MF_MNTDIR_SAMPLED 0x0001 | |
4ab2f15b | 1141 | #define EXT4_MF_FS_ABORTED 0x0002 /* Fatal error detected */ |
bc0b0d6d | 1142 | |
ca0faba0 TT |
1143 | /* |
1144 | * fourth extended-fs super-block data in memory | |
1145 | */ | |
1146 | struct ext4_sb_info { | |
1147 | unsigned long s_desc_size; /* Size of a group descriptor in bytes */ | |
1148 | unsigned long s_inodes_per_block;/* Number of inodes per block */ | |
1149 | unsigned long s_blocks_per_group;/* Number of blocks in a group */ | |
281b5995 | 1150 | unsigned long s_clusters_per_group; /* Number of clusters in a group */ |
ca0faba0 TT |
1151 | unsigned long s_inodes_per_group;/* Number of inodes in a group */ |
1152 | unsigned long s_itb_per_group; /* Number of inode table blocks per group */ | |
1153 | unsigned long s_gdb_count; /* Number of group descriptor blocks */ | |
1154 | unsigned long s_desc_per_block; /* Number of group descriptors per block */ | |
1155 | ext4_group_t s_groups_count; /* Number of groups in the fs */ | |
fb0a387d | 1156 | ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */ |
ca0faba0 TT |
1157 | unsigned long s_overhead_last; /* Last calculated overhead */ |
1158 | unsigned long s_blocks_last; /* Last seen block count */ | |
281b5995 TT |
1159 | unsigned int s_cluster_ratio; /* Number of blocks per cluster */ |
1160 | unsigned int s_cluster_bits; /* log2 of s_cluster_ratio */ | |
ca0faba0 TT |
1161 | loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */ |
1162 | struct buffer_head * s_sbh; /* Buffer containing the super block */ | |
1163 | struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */ | |
1164 | struct buffer_head **s_group_desc; | |
7f4520cc | 1165 | unsigned int s_mount_opt; |
a2595b8a | 1166 | unsigned int s_mount_opt2; |
bc0b0d6d | 1167 | unsigned int s_mount_flags; |
5a916be1 | 1168 | unsigned int s_def_mount_opt; |
ca0faba0 TT |
1169 | ext4_fsblk_t s_sb_block; |
1170 | uid_t s_resuid; | |
1171 | gid_t s_resgid; | |
1172 | unsigned short s_mount_state; | |
1173 | unsigned short s_pad; | |
1174 | int s_addr_per_block_bits; | |
1175 | int s_desc_per_block_bits; | |
1176 | int s_inode_size; | |
1177 | int s_first_ino; | |
1178 | unsigned int s_inode_readahead_blks; | |
11013911 | 1179 | unsigned int s_inode_goal; |
ca0faba0 TT |
1180 | spinlock_t s_next_gen_lock; |
1181 | u32 s_next_generation; | |
1182 | u32 s_hash_seed[4]; | |
1183 | int s_def_hash_version; | |
1184 | int s_hash_unsigned; /* 3 if hash should be signed, 0 if not */ | |
57042651 | 1185 | struct percpu_counter s_freeclusters_counter; |
ca0faba0 TT |
1186 | struct percpu_counter s_freeinodes_counter; |
1187 | struct percpu_counter s_dirs_counter; | |
57042651 | 1188 | struct percpu_counter s_dirtyclusters_counter; |
ca0faba0 TT |
1189 | struct blockgroup_lock *s_blockgroup_lock; |
1190 | struct proc_dir_entry *s_proc; | |
1191 | struct kobject s_kobj; | |
1192 | struct completion s_kobj_unregister; | |
1193 | ||
1194 | /* Journaling */ | |
ca0faba0 TT |
1195 | struct journal_s *s_journal; |
1196 | struct list_head s_orphan; | |
1197 | struct mutex s_orphan_lock; | |
8f82f840 YY |
1198 | unsigned long s_resize_flags; /* Flags indicating if there |
1199 | is a resizer */ | |
ca0faba0 TT |
1200 | unsigned long s_commit_interval; |
1201 | u32 s_max_batch_time; | |
1202 | u32 s_min_batch_time; | |
1203 | struct block_device *journal_bdev; | |
ca0faba0 TT |
1204 | #ifdef CONFIG_QUOTA |
1205 | char *s_qf_names[MAXQUOTAS]; /* Names of quota files with journalled quota */ | |
1206 | int s_jquota_fmt; /* Format of quota to use */ | |
1207 | #endif | |
1208 | unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */ | |
6fd058f7 | 1209 | struct rb_root system_blks; |
ca0faba0 TT |
1210 | |
1211 | #ifdef EXTENTS_STATS | |
1212 | /* ext4 extents stats */ | |
1213 | unsigned long s_ext_min; | |
1214 | unsigned long s_ext_max; | |
1215 | unsigned long s_depth_max; | |
1216 | spinlock_t s_ext_stats_lock; | |
1217 | unsigned long s_ext_blocks; | |
1218 | unsigned long s_ext_extents; | |
1219 | #endif | |
1220 | ||
1221 | /* for buddy allocator */ | |
1222 | struct ext4_group_info ***s_group_info; | |
1223 | struct inode *s_buddy_cache; | |
ca0faba0 | 1224 | spinlock_t s_md_lock; |
ca0faba0 TT |
1225 | unsigned short *s_mb_offsets; |
1226 | unsigned int *s_mb_maxs; | |
1227 | ||
1228 | /* tunables */ | |
1229 | unsigned long s_stripe; | |
1230 | unsigned int s_mb_stream_request; | |
1231 | unsigned int s_mb_max_to_scan; | |
1232 | unsigned int s_mb_min_to_scan; | |
1233 | unsigned int s_mb_stats; | |
1234 | unsigned int s_mb_order2_reqs; | |
1235 | unsigned int s_mb_group_prealloc; | |
55138e0b | 1236 | unsigned int s_max_writeback_mb_bump; |
ca0faba0 TT |
1237 | /* where last allocation was done - for stream allocation */ |
1238 | unsigned long s_mb_last_group; | |
1239 | unsigned long s_mb_last_start; | |
1240 | ||
ca0faba0 | 1241 | /* stats for buddy allocator */ |
ca0faba0 TT |
1242 | atomic_t s_bal_reqs; /* number of reqs with len > 1 */ |
1243 | atomic_t s_bal_success; /* we found long enough chunks */ | |
1244 | atomic_t s_bal_allocated; /* in blocks */ | |
1245 | atomic_t s_bal_ex_scanned; /* total extents scanned */ | |
1246 | atomic_t s_bal_goals; /* goal hits */ | |
1247 | atomic_t s_bal_breaks; /* too long searches */ | |
1248 | atomic_t s_bal_2orders; /* 2^order hits */ | |
1249 | spinlock_t s_bal_lock; | |
1250 | unsigned long s_mb_buddies_generated; | |
1251 | unsigned long long s_mb_generation_time; | |
1252 | atomic_t s_mb_lost_chunks; | |
1253 | atomic_t s_mb_preallocated; | |
1254 | atomic_t s_mb_discarded; | |
50797481 | 1255 | atomic_t s_lock_busy; |
ca0faba0 TT |
1256 | |
1257 | /* locality groups */ | |
003cb608 | 1258 | struct ext4_locality_group __percpu *s_locality_groups; |
ca0faba0 TT |
1259 | |
1260 | /* for write statistics */ | |
1261 | unsigned long s_sectors_written_start; | |
1262 | u64 s_kbytes_written; | |
1263 | ||
1264 | unsigned int s_log_groups_per_flex; | |
1265 | struct flex_groups *s_flex_groups; | |
4c0425ff MC |
1266 | |
1267 | /* workqueue for dio unwritten */ | |
1268 | struct workqueue_struct *dio_unwritten_wq; | |
66e61a9e TT |
1269 | |
1270 | /* timer for periodic error stats printing */ | |
1271 | struct timer_list s_err_report; | |
bfff6873 LC |
1272 | |
1273 | /* Lazy inode table initialization info */ | |
1274 | struct ext4_li_request *s_li_request; | |
1275 | /* Wait multiplier for lazy initialization thread */ | |
1276 | unsigned int s_li_wait_mult; | |
c5e06d10 JL |
1277 | |
1278 | /* Kernel thread for multiple mount protection */ | |
1279 | struct task_struct *s_mmp_tsk; | |
3d56b8d2 TM |
1280 | |
1281 | /* record the last minlen when FITRIM is called. */ | |
1282 | atomic_t s_last_trim_minblks; | |
0441984a DW |
1283 | |
1284 | /* Reference to checksum algorithm driver via cryptoapi */ | |
1285 | struct crypto_shash *s_chksum_driver; | |
a9c47317 DW |
1286 | |
1287 | /* Precomputed FS UUID checksum for seeding other checksums */ | |
1288 | __u32 s_csum_seed; | |
ca0faba0 TT |
1289 | }; |
1290 | ||
af5bc92d | 1291 | static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb) |
ac27a0ec DK |
1292 | { |
1293 | return sb->s_fs_info; | |
1294 | } | |
617ba13b | 1295 | static inline struct ext4_inode_info *EXT4_I(struct inode *inode) |
ac27a0ec | 1296 | { |
617ba13b | 1297 | return container_of(inode, struct ext4_inode_info, vfs_inode); |
ac27a0ec DK |
1298 | } |
1299 | ||
ef7f3835 KS |
1300 | static inline struct timespec ext4_current_time(struct inode *inode) |
1301 | { | |
1302 | return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ? | |
1303 | current_fs_time(inode->i_sb) : CURRENT_TIME_SEC; | |
1304 | } | |
1305 | ||
617ba13b | 1306 | static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino) |
ac27a0ec | 1307 | { |
617ba13b MC |
1308 | return ino == EXT4_ROOT_INO || |
1309 | ino == EXT4_JOURNAL_INO || | |
1310 | ino == EXT4_RESIZE_INO || | |
1311 | (ino >= EXT4_FIRST_INO(sb) && | |
1312 | ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count)); | |
ac27a0ec | 1313 | } |
19f5fb7a | 1314 | |
0edeb71d TM |
1315 | static inline void ext4_set_io_unwritten_flag(struct inode *inode, |
1316 | struct ext4_io_end *io_end) | |
1317 | { | |
1318 | if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) { | |
1319 | io_end->flag |= EXT4_IO_END_UNWRITTEN; | |
1320 | atomic_inc(&EXT4_I(inode)->i_aiodio_unwritten); | |
1321 | } | |
1322 | } | |
1323 | ||
19f5fb7a TT |
1324 | /* |
1325 | * Inode dynamic state flags | |
1326 | */ | |
1327 | enum { | |
1328 | EXT4_STATE_JDATA, /* journaled data exists */ | |
1329 | EXT4_STATE_NEW, /* inode is newly created */ | |
1330 | EXT4_STATE_XATTR, /* has in-inode xattrs */ | |
1331 | EXT4_STATE_NO_EXPAND, /* No space for expansion */ | |
1332 | EXT4_STATE_DA_ALLOC_CLOSE, /* Alloc DA blks on close */ | |
1333 | EXT4_STATE_EXT_MIGRATE, /* Inode is migrating */ | |
1334 | EXT4_STATE_DIO_UNWRITTEN, /* need convert on dio done*/ | |
14ece102 | 1335 | EXT4_STATE_NEWENTRY, /* File just added to dir */ |
f2321097 | 1336 | EXT4_STATE_DELALLOC_RESERVED, /* blks already reserved for delalloc */ |
19f5fb7a TT |
1337 | }; |
1338 | ||
353eb83c | 1339 | #define EXT4_INODE_BIT_FNS(name, field, offset) \ |
12e9b892 DM |
1340 | static inline int ext4_test_inode_##name(struct inode *inode, int bit) \ |
1341 | { \ | |
353eb83c | 1342 | return test_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ |
12e9b892 DM |
1343 | } \ |
1344 | static inline void ext4_set_inode_##name(struct inode *inode, int bit) \ | |
1345 | { \ | |
353eb83c | 1346 | set_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ |
12e9b892 DM |
1347 | } \ |
1348 | static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \ | |
1349 | { \ | |
353eb83c | 1350 | clear_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ |
19f5fb7a TT |
1351 | } |
1352 | ||
353eb83c TT |
1353 | EXT4_INODE_BIT_FNS(flag, flags, 0) |
1354 | #if (BITS_PER_LONG < 64) | |
1355 | EXT4_INODE_BIT_FNS(state, state_flags, 0) | |
1356 | ||
1357 | static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) | |
1358 | { | |
1359 | (ei)->i_state_flags = 0; | |
1360 | } | |
1361 | #else | |
1362 | EXT4_INODE_BIT_FNS(state, flags, 32) | |
1363 | ||
1364 | static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) | |
1365 | { | |
1366 | /* We depend on the fact that callers will set i_flags */ | |
1367 | } | |
1368 | #endif | |
ac27a0ec | 1369 | #else |
617ba13b | 1370 | /* Assume that user mode programs are passing in an ext4fs superblock, not |
ac27a0ec DK |
1371 | * a kernel struct super_block. This will allow us to call the feature-test |
1372 | * macros from user land. */ | |
617ba13b | 1373 | #define EXT4_SB(sb) (sb) |
ac27a0ec DK |
1374 | #endif |
1375 | ||
617ba13b | 1376 | #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime |
ac27a0ec DK |
1377 | |
1378 | /* | |
1379 | * Codes for operating systems | |
1380 | */ | |
617ba13b MC |
1381 | #define EXT4_OS_LINUX 0 |
1382 | #define EXT4_OS_HURD 1 | |
1383 | #define EXT4_OS_MASIX 2 | |
1384 | #define EXT4_OS_FREEBSD 3 | |
1385 | #define EXT4_OS_LITES 4 | |
ac27a0ec DK |
1386 | |
1387 | /* | |
1388 | * Revision levels | |
1389 | */ | |
617ba13b MC |
1390 | #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */ |
1391 | #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ | |
ac27a0ec | 1392 | |
617ba13b MC |
1393 | #define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV |
1394 | #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV | |
ac27a0ec | 1395 | |
617ba13b | 1396 | #define EXT4_GOOD_OLD_INODE_SIZE 128 |
ac27a0ec DK |
1397 | |
1398 | /* | |
1399 | * Feature set definitions | |
1400 | */ | |
1401 | ||
617ba13b | 1402 | #define EXT4_HAS_COMPAT_FEATURE(sb,mask) \ |
3a06d778 | 1403 | ((EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask)) != 0) |
617ba13b | 1404 | #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \ |
3a06d778 | 1405 | ((EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask)) != 0) |
617ba13b | 1406 | #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \ |
3a06d778 | 1407 | ((EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask)) != 0) |
617ba13b MC |
1408 | #define EXT4_SET_COMPAT_FEATURE(sb,mask) \ |
1409 | EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask) | |
1410 | #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \ | |
1411 | EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask) | |
1412 | #define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \ | |
1413 | EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask) | |
1414 | #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \ | |
1415 | EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask) | |
1416 | #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \ | |
1417 | EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask) | |
1418 | #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \ | |
1419 | EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask) | |
1420 | ||
1421 | #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001 | |
1422 | #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002 | |
1423 | #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004 | |
1424 | #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008 | |
1425 | #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010 | |
1426 | #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020 | |
1427 | ||
1428 | #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 | |
1429 | #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 | |
1430 | #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 | |
0fc1b451 | 1431 | #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008 |
717d50e4 | 1432 | #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010 |
f8628a14 | 1433 | #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020 |
ef7f3835 | 1434 | #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040 |
ae812306 | 1435 | #define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100 |
281b5995 | 1436 | #define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200 |
e6153918 DW |
1437 | /* |
1438 | * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM). When | |
1439 | * METADATA_CSUM is set, group descriptor checksums use the same algorithm as | |
1440 | * all other data structures' checksums. However, the METADATA_CSUM and | |
1441 | * GDT_CSUM bits are mutually exclusive. | |
1442 | */ | |
9b90e5e0 | 1443 | #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400 |
617ba13b MC |
1444 | |
1445 | #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001 | |
1446 | #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002 | |
1447 | #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */ | |
1448 | #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */ | |
1449 | #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010 | |
a86c6181 | 1450 | #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */ |
bd81d8ee | 1451 | #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080 |
0fc1b451 | 1452 | #define EXT4_FEATURE_INCOMPAT_MMP 0x0100 |
ce421581 | 1453 | #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200 |
f710b4b9 TT |
1454 | #define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 /* EA in inode */ |
1455 | #define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 /* data in dirent */ | |
856cbcf9 | 1456 | #define EXT4_FEATURE_INCOMPAT_BG_USE_META_CSUM 0x2000 /* use crc32c for bg */ |
9b90e5e0 | 1457 | #define EXT4_FEATURE_INCOMPAT_LARGEDIR 0x4000 /* >2GB or 3-lvl htree */ |
856cbcf9 | 1458 | #define EXT4_FEATURE_INCOMPAT_INLINEDATA 0x8000 /* data in inode */ |
617ba13b | 1459 | |
2035e776 TT |
1460 | #define EXT2_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR |
1461 | #define EXT2_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ | |
1462 | EXT4_FEATURE_INCOMPAT_META_BG) | |
1463 | #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ | |
1464 | EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ | |
1465 | EXT4_FEATURE_RO_COMPAT_BTREE_DIR) | |
1466 | ||
1467 | #define EXT3_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR | |
1468 | #define EXT3_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ | |
1469 | EXT4_FEATURE_INCOMPAT_RECOVER| \ | |
1470 | EXT4_FEATURE_INCOMPAT_META_BG) | |
1471 | #define EXT3_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ | |
1472 | EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ | |
1473 | EXT4_FEATURE_RO_COMPAT_BTREE_DIR) | |
1474 | ||
617ba13b MC |
1475 | #define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR |
1476 | #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ | |
1477 | EXT4_FEATURE_INCOMPAT_RECOVER| \ | |
a86c6181 | 1478 | EXT4_FEATURE_INCOMPAT_META_BG| \ |
bd81d8ee | 1479 | EXT4_FEATURE_INCOMPAT_EXTENTS| \ |
ce421581 | 1480 | EXT4_FEATURE_INCOMPAT_64BIT| \ |
c5e06d10 JL |
1481 | EXT4_FEATURE_INCOMPAT_FLEX_BG| \ |
1482 | EXT4_FEATURE_INCOMPAT_MMP) | |
617ba13b MC |
1483 | #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ |
1484 | EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ | |
717d50e4 | 1485 | EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \ |
f8628a14 | 1486 | EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \ |
ef7f3835 | 1487 | EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \ |
0fc1b451 | 1488 | EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\ |
6f16b606 TT |
1489 | EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\ |
1490 | EXT4_FEATURE_RO_COMPAT_BIGALLOC) | |
ac27a0ec DK |
1491 | |
1492 | /* | |
1493 | * Default values for user and/or group using reserved blocks | |
1494 | */ | |
617ba13b MC |
1495 | #define EXT4_DEF_RESUID 0 |
1496 | #define EXT4_DEF_RESGID 0 | |
ac27a0ec | 1497 | |
240799cd TT |
1498 | #define EXT4_DEF_INODE_READAHEAD_BLKS 32 |
1499 | ||
ac27a0ec DK |
1500 | /* |
1501 | * Default mount options | |
1502 | */ | |
617ba13b MC |
1503 | #define EXT4_DEFM_DEBUG 0x0001 |
1504 | #define EXT4_DEFM_BSDGROUPS 0x0002 | |
1505 | #define EXT4_DEFM_XATTR_USER 0x0004 | |
1506 | #define EXT4_DEFM_ACL 0x0008 | |
1507 | #define EXT4_DEFM_UID16 0x0010 | |
1508 | #define EXT4_DEFM_JMODE 0x0060 | |
1509 | #define EXT4_DEFM_JMODE_DATA 0x0020 | |
1510 | #define EXT4_DEFM_JMODE_ORDERED 0x0040 | |
1511 | #define EXT4_DEFM_JMODE_WBACK 0x0060 | |
8b67f04a TT |
1512 | #define EXT4_DEFM_NOBARRIER 0x0100 |
1513 | #define EXT4_DEFM_BLOCK_VALIDITY 0x0200 | |
1514 | #define EXT4_DEFM_DISCARD 0x0400 | |
1515 | #define EXT4_DEFM_NODELALLOC 0x0800 | |
ac27a0ec | 1516 | |
30773840 TT |
1517 | /* |
1518 | * Default journal batch times | |
1519 | */ | |
1520 | #define EXT4_DEF_MIN_BATCH_TIME 0 | |
1521 | #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */ | |
1522 | ||
a4912123 TT |
1523 | /* |
1524 | * Minimum number of groups in a flexgroup before we separate out | |
1525 | * directories into the first block group of a flexgroup | |
1526 | */ | |
1527 | #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4 | |
1528 | ||
ac27a0ec DK |
1529 | /* |
1530 | * Structure of a directory entry | |
1531 | */ | |
617ba13b | 1532 | #define EXT4_NAME_LEN 255 |
ac27a0ec | 1533 | |
617ba13b | 1534 | struct ext4_dir_entry { |
ac27a0ec DK |
1535 | __le32 inode; /* Inode number */ |
1536 | __le16 rec_len; /* Directory entry length */ | |
1537 | __le16 name_len; /* Name length */ | |
617ba13b | 1538 | char name[EXT4_NAME_LEN]; /* File name */ |
ac27a0ec DK |
1539 | }; |
1540 | ||
1541 | /* | |
617ba13b | 1542 | * The new version of the directory entry. Since EXT4 structures are |
ac27a0ec DK |
1543 | * stored in intel byte order, and the name_len field could never be |
1544 | * bigger than 255 chars, it's safe to reclaim the extra byte for the | |
1545 | * file_type field. | |
1546 | */ | |
617ba13b | 1547 | struct ext4_dir_entry_2 { |
ac27a0ec DK |
1548 | __le32 inode; /* Inode number */ |
1549 | __le16 rec_len; /* Directory entry length */ | |
1550 | __u8 name_len; /* Name length */ | |
1551 | __u8 file_type; | |
617ba13b | 1552 | char name[EXT4_NAME_LEN]; /* File name */ |
ac27a0ec DK |
1553 | }; |
1554 | ||
e6153918 DW |
1555 | /* |
1556 | * This is a bogus directory entry at the end of each leaf block that | |
1557 | * records checksums. | |
1558 | */ | |
1559 | struct ext4_dir_entry_tail { | |
1560 | __le32 det_reserved_zero1; /* Pretend to be unused */ | |
1561 | __le16 det_rec_len; /* 12 */ | |
1562 | __u8 det_reserved_zero2; /* Zero name length */ | |
1563 | __u8 det_reserved_ft; /* 0xDE, fake file type */ | |
1564 | __le32 det_checksum; /* crc32c(uuid+inum+dirblock) */ | |
1565 | }; | |
1566 | ||
ac27a0ec | 1567 | /* |
617ba13b | 1568 | * Ext4 directory file types. Only the low 3 bits are used. The |
ac27a0ec DK |
1569 | * other bits are reserved for now. |
1570 | */ | |
617ba13b MC |
1571 | #define EXT4_FT_UNKNOWN 0 |
1572 | #define EXT4_FT_REG_FILE 1 | |
1573 | #define EXT4_FT_DIR 2 | |
1574 | #define EXT4_FT_CHRDEV 3 | |
1575 | #define EXT4_FT_BLKDEV 4 | |
1576 | #define EXT4_FT_FIFO 5 | |
1577 | #define EXT4_FT_SOCK 6 | |
1578 | #define EXT4_FT_SYMLINK 7 | |
ac27a0ec | 1579 | |
617ba13b | 1580 | #define EXT4_FT_MAX 8 |
ac27a0ec | 1581 | |
e6153918 DW |
1582 | #define EXT4_FT_DIR_CSUM 0xDE |
1583 | ||
ac27a0ec | 1584 | /* |
617ba13b | 1585 | * EXT4_DIR_PAD defines the directory entries boundaries |
ac27a0ec DK |
1586 | * |
1587 | * NOTE: It must be a multiple of 4 | |
1588 | */ | |
617ba13b MC |
1589 | #define EXT4_DIR_PAD 4 |
1590 | #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1) | |
1591 | #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \ | |
1592 | ~EXT4_DIR_ROUND) | |
a72d7f83 JK |
1593 | #define EXT4_MAX_REC_LEN ((1<<16)-1) |
1594 | ||
0cfc9255 ES |
1595 | /* |
1596 | * If we ever get support for fs block sizes > page_size, we'll need | |
1597 | * to remove the #if statements in the next two functions... | |
1598 | */ | |
1599 | static inline unsigned int | |
1600 | ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize) | |
1601 | { | |
1602 | unsigned len = le16_to_cpu(dlen); | |
1603 | ||
1604 | #if (PAGE_CACHE_SIZE >= 65536) | |
1605 | if (len == EXT4_MAX_REC_LEN || len == 0) | |
1606 | return blocksize; | |
1607 | return (len & 65532) | ((len & 3) << 16); | |
1608 | #else | |
1609 | return len; | |
1610 | #endif | |
1611 | } | |
1612 | ||
1613 | static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize) | |
1614 | { | |
1615 | if ((len > blocksize) || (blocksize > (1 << 18)) || (len & 3)) | |
1616 | BUG(); | |
1617 | #if (PAGE_CACHE_SIZE >= 65536) | |
1618 | if (len < 65536) | |
1619 | return cpu_to_le16(len); | |
1620 | if (len == blocksize) { | |
1621 | if (blocksize == 65536) | |
1622 | return cpu_to_le16(EXT4_MAX_REC_LEN); | |
1623 | else | |
1624 | return cpu_to_le16(0); | |
1625 | } | |
1626 | return cpu_to_le16((len & 65532) | ((len >> 16) & 3)); | |
1627 | #else | |
1628 | return cpu_to_le16(len); | |
1629 | #endif | |
1630 | } | |
1631 | ||
ac27a0ec DK |
1632 | /* |
1633 | * Hash Tree Directory indexing | |
1634 | * (c) Daniel Phillips, 2001 | |
1635 | */ | |
1636 | ||
4074fe37 ES |
1637 | #define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \ |
1638 | EXT4_FEATURE_COMPAT_DIR_INDEX) && \ | |
12e9b892 | 1639 | ext4_test_inode_flag((dir), EXT4_INODE_INDEX)) |
617ba13b MC |
1640 | #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX) |
1641 | #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1) | |
ac27a0ec DK |
1642 | |
1643 | /* Legal values for the dx_root hash_version field: */ | |
1644 | ||
1645 | #define DX_HASH_LEGACY 0 | |
1646 | #define DX_HASH_HALF_MD4 1 | |
1647 | #define DX_HASH_TEA 2 | |
f99b2589 TT |
1648 | #define DX_HASH_LEGACY_UNSIGNED 3 |
1649 | #define DX_HASH_HALF_MD4_UNSIGNED 4 | |
1650 | #define DX_HASH_TEA_UNSIGNED 5 | |
ac27a0ec | 1651 | |
0441984a DW |
1652 | static inline u32 ext4_chksum(struct ext4_sb_info *sbi, u32 crc, |
1653 | const void *address, unsigned int length) | |
1654 | { | |
1655 | struct { | |
1656 | struct shash_desc shash; | |
1657 | char ctx[crypto_shash_descsize(sbi->s_chksum_driver)]; | |
1658 | } desc; | |
1659 | int err; | |
1660 | ||
1661 | desc.shash.tfm = sbi->s_chksum_driver; | |
1662 | desc.shash.flags = 0; | |
1663 | *(u32 *)desc.ctx = crc; | |
1664 | ||
1665 | err = crypto_shash_update(&desc.shash, address, length); | |
1666 | BUG_ON(err); | |
1667 | ||
1668 | return *(u32 *)desc.ctx; | |
1669 | } | |
1670 | ||
ac27a0ec DK |
1671 | #ifdef __KERNEL__ |
1672 | ||
1673 | /* hash info structure used by the directory hash */ | |
1674 | struct dx_hash_info | |
1675 | { | |
1676 | u32 hash; | |
1677 | u32 minor_hash; | |
1678 | int hash_version; | |
1679 | u32 *seed; | |
1680 | }; | |
1681 | ||
d1f5273e FY |
1682 | |
1683 | /* 32 and 64 bit signed EOF for dx directories */ | |
1684 | #define EXT4_HTREE_EOF_32BIT ((1UL << (32 - 1)) - 1) | |
1685 | #define EXT4_HTREE_EOF_64BIT ((1ULL << (64 - 1)) - 1) | |
1686 | ||
ac27a0ec DK |
1687 | |
1688 | /* | |
617ba13b | 1689 | * Control parameters used by ext4_htree_next_block |
ac27a0ec DK |
1690 | */ |
1691 | #define HASH_NB_ALWAYS 1 | |
1692 | ||
1693 | ||
1694 | /* | |
1695 | * Describe an inode's exact location on disk and in memory | |
1696 | */ | |
617ba13b | 1697 | struct ext4_iloc |
ac27a0ec DK |
1698 | { |
1699 | struct buffer_head *bh; | |
1700 | unsigned long offset; | |
fd2d4291 | 1701 | ext4_group_t block_group; |
ac27a0ec DK |
1702 | }; |
1703 | ||
617ba13b | 1704 | static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc) |
ac27a0ec | 1705 | { |
617ba13b | 1706 | return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset); |
ac27a0ec DK |
1707 | } |
1708 | ||
1709 | /* | |
1710 | * This structure is stuffed into the struct file's private_data field | |
1711 | * for directories. It is where we put information so that we can do | |
1712 | * readdir operations in hash tree order. | |
1713 | */ | |
1714 | struct dir_private_info { | |
1715 | struct rb_root root; | |
1716 | struct rb_node *curr_node; | |
1717 | struct fname *extra_fname; | |
1718 | loff_t last_pos; | |
1719 | __u32 curr_hash; | |
1720 | __u32 curr_minor_hash; | |
1721 | __u32 next_hash; | |
1722 | }; | |
1723 | ||
1724 | /* calculate the first block number of the group */ | |
617ba13b | 1725 | static inline ext4_fsblk_t |
fd2d4291 | 1726 | ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no) |
ac27a0ec | 1727 | { |
617ba13b MC |
1728 | return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) + |
1729 | le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block); | |
ac27a0ec DK |
1730 | } |
1731 | ||
1732 | /* | |
1733 | * Special error return code only used by dx_probe() and its callers. | |
1734 | */ | |
1735 | #define ERR_BAD_DX_DIR -75000 | |
1736 | ||
72b64b59 | 1737 | void ext4_get_group_no_and_offset(struct super_block *sb, ext4_fsblk_t blocknr, |
a9df9a49 | 1738 | ext4_group_t *blockgrpp, ext4_grpblk_t *offsetp); |
3a5b2ecd | 1739 | |
bfff6873 LC |
1740 | /* |
1741 | * Timeout and state flag for lazy initialization inode thread. | |
1742 | */ | |
1743 | #define EXT4_DEF_LI_WAIT_MULT 10 | |
1744 | #define EXT4_DEF_LI_MAX_START_DELAY 5 | |
1745 | #define EXT4_LAZYINIT_QUIT 0x0001 | |
1746 | #define EXT4_LAZYINIT_RUNNING 0x0002 | |
1747 | ||
1748 | /* | |
1749 | * Lazy inode table initialization info | |
1750 | */ | |
1751 | struct ext4_lazy_init { | |
1752 | unsigned long li_state; | |
bfff6873 LC |
1753 | struct list_head li_request_list; |
1754 | struct mutex li_list_mtx; | |
1755 | }; | |
1756 | ||
1757 | struct ext4_li_request { | |
1758 | struct super_block *lr_super; | |
1759 | struct ext4_sb_info *lr_sbi; | |
1760 | ext4_group_t lr_next_group; | |
1761 | struct list_head lr_request; | |
1762 | unsigned long lr_next_sched; | |
1763 | unsigned long lr_timeout; | |
1764 | }; | |
1765 | ||
857ac889 LC |
1766 | struct ext4_features { |
1767 | struct kobject f_kobj; | |
1768 | struct completion f_kobj_unregister; | |
1769 | }; | |
1770 | ||
c5e06d10 JL |
1771 | /* |
1772 | * This structure will be used for multiple mount protection. It will be | |
1773 | * written into the block number saved in the s_mmp_block field in the | |
1774 | * superblock. Programs that check MMP should assume that if | |
1775 | * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe | |
1776 | * to use the filesystem, regardless of how old the timestamp is. | |
1777 | */ | |
1778 | #define EXT4_MMP_MAGIC 0x004D4D50U /* ASCII for MMP */ | |
1779 | #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */ | |
1780 | #define EXT4_MMP_SEQ_FSCK 0xE24D4D50U /* mmp_seq value when being fscked */ | |
1781 | #define EXT4_MMP_SEQ_MAX 0xE24D4D4FU /* maximum valid mmp_seq value */ | |
1782 | ||
1783 | struct mmp_struct { | |
1784 | __le32 mmp_magic; /* Magic number for MMP */ | |
1785 | __le32 mmp_seq; /* Sequence no. updated periodically */ | |
1786 | ||
1787 | /* | |
1788 | * mmp_time, mmp_nodename & mmp_bdevname are only used for information | |
1789 | * purposes and do not affect the correctness of the algorithm | |
1790 | */ | |
1791 | __le64 mmp_time; /* Time last updated */ | |
1792 | char mmp_nodename[64]; /* Node which last updated MMP block */ | |
1793 | char mmp_bdevname[32]; /* Bdev which last updated MMP block */ | |
1794 | ||
1795 | /* | |
1796 | * mmp_check_interval is used to verify if the MMP block has been | |
1797 | * updated on the block device. The value is updated based on the | |
1798 | * maximum time to write the MMP block during an update cycle. | |
1799 | */ | |
1800 | __le16 mmp_check_interval; | |
1801 | ||
1802 | __le16 mmp_pad1; | |
e6153918 DW |
1803 | __le32 mmp_pad2[226]; |
1804 | __le32 mmp_checksum; /* crc32c(uuid+mmp_block) */ | |
c5e06d10 JL |
1805 | }; |
1806 | ||
1807 | /* arguments passed to the mmp thread */ | |
1808 | struct mmpd_data { | |
1809 | struct buffer_head *bh; /* bh from initial read_mmp_block() */ | |
1810 | struct super_block *sb; /* super block of the fs */ | |
1811 | }; | |
1812 | ||
1813 | /* | |
1814 | * Check interval multiplier | |
1815 | * The MMP block is written every update interval and initially checked every | |
1816 | * update interval x the multiplier (the value is then adapted based on the | |
1817 | * write latency). The reason is that writes can be delayed under load and we | |
1818 | * don't want readers to incorrectly assume that the filesystem is no longer | |
1819 | * in use. | |
1820 | */ | |
1821 | #define EXT4_MMP_CHECK_MULT 2UL | |
1822 | ||
1823 | /* | |
1824 | * Minimum interval for MMP checking in seconds. | |
1825 | */ | |
1826 | #define EXT4_MMP_MIN_CHECK_INTERVAL 5UL | |
1827 | ||
1828 | /* | |
1829 | * Maximum interval for MMP checking in seconds. | |
1830 | */ | |
1831 | #define EXT4_MMP_MAX_CHECK_INTERVAL 300UL | |
1832 | ||
ac27a0ec DK |
1833 | /* |
1834 | * Function prototypes | |
1835 | */ | |
1836 | ||
1837 | /* | |
1838 | * Ok, these declarations are also in <linux/kernel.h> but none of the | |
617ba13b | 1839 | * ext4 source programs needs to include it so they are duplicated here. |
ac27a0ec | 1840 | */ |
8c55e204 DK |
1841 | # define NORET_TYPE /**/ |
1842 | # define ATTRIB_NORET __attribute__((noreturn)) | |
1843 | # define NORET_AND noreturn, | |
ac27a0ec | 1844 | |
498e5f24 TT |
1845 | /* bitmap.c */ |
1846 | extern unsigned int ext4_count_free(struct buffer_head *, unsigned); | |
1847 | ||
ac27a0ec | 1848 | /* balloc.c */ |
3a5b2ecd MC |
1849 | extern unsigned int ext4_block_group(struct super_block *sb, |
1850 | ext4_fsblk_t blocknr); | |
1851 | extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb, | |
1852 | ext4_fsblk_t blocknr); | |
fd2d4291 AM |
1853 | extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group); |
1854 | extern unsigned long ext4_bg_num_gdb(struct super_block *sb, | |
1855 | ext4_group_t group); | |
7061eba7 | 1856 | extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode, |
55f020db AH |
1857 | ext4_fsblk_t goal, |
1858 | unsigned int flags, | |
1859 | unsigned long *count, | |
1860 | int *errp); | |
e7d5f315 TT |
1861 | extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi, |
1862 | s64 nclusters, unsigned int flags); | |
5dee5437 | 1863 | extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *); |
af5bc92d | 1864 | extern void ext4_check_blocks_bitmap(struct super_block *); |
617ba13b | 1865 | extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb, |
fd2d4291 | 1866 | ext4_group_t block_group, |
ac27a0ec | 1867 | struct buffer_head ** bh); |
617ba13b | 1868 | extern int ext4_should_retry_alloc(struct super_block *sb, int *retries); |
813e5727 TT |
1869 | |
1870 | extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb, | |
1871 | ext4_group_t block_group); | |
1872 | extern int ext4_wait_block_bitmap(struct super_block *sb, | |
1873 | ext4_group_t block_group, | |
1874 | struct buffer_head *bh); | |
1875 | extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb, | |
1876 | ext4_group_t block_group); | |
fd034a84 TT |
1877 | extern void ext4_init_block_bitmap(struct super_block *sb, |
1878 | struct buffer_head *bh, | |
1879 | ext4_group_t group, | |
1880 | struct ext4_group_desc *desc); | |
cff1dfd7 TT |
1881 | extern unsigned ext4_free_clusters_after_init(struct super_block *sb, |
1882 | ext4_group_t block_group, | |
1883 | struct ext4_group_desc *gdp); | |
d5b8f310 TT |
1884 | extern unsigned ext4_num_overhead_clusters(struct super_block *sb, |
1885 | ext4_group_t block_group, | |
1886 | struct ext4_group_desc *gdp); | |
f86186b4 | 1887 | ext4_fsblk_t ext4_inode_to_goal_block(struct inode *); |
ac27a0ec DK |
1888 | |
1889 | /* dir.c */ | |
60fd4da3 | 1890 | extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *, |
f7c21177 | 1891 | struct file *, |
60fd4da3 TT |
1892 | struct ext4_dir_entry_2 *, |
1893 | struct buffer_head *, unsigned int); | |
f7c21177 TT |
1894 | #define ext4_check_dir_entry(dir, filp, de, bh, offset) \ |
1895 | unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \ | |
1896 | (de), (bh), (offset))) | |
617ba13b | 1897 | extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash, |
ac27a0ec | 1898 | __u32 minor_hash, |
617ba13b MC |
1899 | struct ext4_dir_entry_2 *dirent); |
1900 | extern void ext4_htree_free_dir_info(struct dir_private_info *p); | |
ac27a0ec DK |
1901 | |
1902 | /* fsync.c */ | |
02c24a82 | 1903 | extern int ext4_sync_file(struct file *, loff_t, loff_t, int); |
3889fd57 | 1904 | extern int ext4_flush_completed_IO(struct inode *); |
ac27a0ec DK |
1905 | |
1906 | /* hash.c */ | |
617ba13b | 1907 | extern int ext4fs_dirhash(const char *name, int len, struct |
ac27a0ec DK |
1908 | dx_hash_info *hinfo); |
1909 | ||
1910 | /* ialloc.c */ | |
dcca3fec | 1911 | extern struct inode *ext4_new_inode(handle_t *, struct inode *, umode_t, |
5cb81dab DM |
1912 | const struct qstr *qstr, __u32 goal, |
1913 | uid_t *owner); | |
af5bc92d TT |
1914 | extern void ext4_free_inode(handle_t *, struct inode *); |
1915 | extern struct inode * ext4_orphan_get(struct super_block *, unsigned long); | |
1916 | extern unsigned long ext4_count_free_inodes(struct super_block *); | |
1917 | extern unsigned long ext4_count_dirs(struct super_block *); | |
1918 | extern void ext4_check_inodes_bitmap(struct super_block *); | |
61d08673 | 1919 | extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap); |
bfff6873 LC |
1920 | extern int ext4_init_inode_table(struct super_block *sb, |
1921 | ext4_group_t group, int barrier); | |
813e5727 | 1922 | extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate); |
ac27a0ec | 1923 | |
c9de560d AT |
1924 | /* mballoc.c */ |
1925 | extern long ext4_mb_stats; | |
1926 | extern long ext4_mb_max_to_scan; | |
1927 | extern int ext4_mb_init(struct super_block *, int); | |
1928 | extern int ext4_mb_release(struct super_block *); | |
1929 | extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *, | |
1930 | struct ext4_allocation_request *, int *); | |
1931 | extern int ext4_mb_reserve_blocks(struct super_block *, int); | |
c2ea3fde | 1932 | extern void ext4_discard_preallocations(struct inode *); |
5dabfc78 TT |
1933 | extern int __init ext4_init_mballoc(void); |
1934 | extern void ext4_exit_mballoc(void); | |
44338711 | 1935 | extern void ext4_free_blocks(handle_t *handle, struct inode *inode, |
e6362609 TT |
1936 | struct buffer_head *bh, ext4_fsblk_t block, |
1937 | unsigned long count, int flags); | |
920313a7 | 1938 | extern int ext4_mb_add_groupinfo(struct super_block *sb, |
5f21b0e6 | 1939 | ext4_group_t i, struct ext4_group_desc *desc); |
cc7365df | 1940 | extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb, |
2846e820 | 1941 | ext4_fsblk_t block, unsigned long count); |
7360d173 LC |
1942 | extern int ext4_trim_fs(struct super_block *, struct fstrim_range *); |
1943 | ||
ac27a0ec | 1944 | /* inode.c */ |
725d26d3 AK |
1945 | struct buffer_head *ext4_getblk(handle_t *, struct inode *, |
1946 | ext4_lblk_t, int, int *); | |
1947 | struct buffer_head *ext4_bread(handle_t *, struct inode *, | |
1948 | ext4_lblk_t, int, int *); | |
6873fa0d ES |
1949 | int ext4_get_block(struct inode *inode, sector_t iblock, |
1950 | struct buffer_head *bh_result, int create); | |
ac27a0ec | 1951 | |
1d1fe1ee | 1952 | extern struct inode *ext4_iget(struct super_block *, unsigned long); |
a9185b41 | 1953 | extern int ext4_write_inode(struct inode *, struct writeback_control *); |
af5bc92d | 1954 | extern int ext4_setattr(struct dentry *, struct iattr *); |
3e3398a0 MC |
1955 | extern int ext4_getattr(struct vfsmount *mnt, struct dentry *dentry, |
1956 | struct kstat *stat); | |
0930fcc1 AV |
1957 | extern void ext4_evict_inode(struct inode *); |
1958 | extern void ext4_clear_inode(struct inode *); | |
af5bc92d | 1959 | extern int ext4_sync_inode(handle_t *, struct inode *); |
aa385729 | 1960 | extern void ext4_dirty_inode(struct inode *, int); |
617ba13b MC |
1961 | extern int ext4_change_inode_journal_flag(struct inode *, int); |
1962 | extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *); | |
91ef4caf | 1963 | extern int ext4_can_truncate(struct inode *inode); |
af5bc92d | 1964 | extern void ext4_truncate(struct inode *); |
a4bb6b64 | 1965 | extern int ext4_punch_hole(struct file *file, loff_t offset, loff_t length); |
487caeef | 1966 | extern int ext4_truncate_restart_trans(handle_t *, struct inode *, int nblocks); |
617ba13b | 1967 | extern void ext4_set_inode_flags(struct inode *); |
ff9ddf7e | 1968 | extern void ext4_get_inode_flags(struct ext4_inode_info *); |
ccd2506b | 1969 | extern int ext4_alloc_da_blocks(struct inode *inode); |
617ba13b | 1970 | extern void ext4_set_aops(struct inode *inode); |
a86c6181 | 1971 | extern int ext4_writepage_trans_blocks(struct inode *); |
f3bd1f3f | 1972 | extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks); |
4e96b2db AH |
1973 | extern int ext4_discard_partial_page_buffers(handle_t *handle, |
1974 | struct address_space *mapping, loff_t from, | |
1975 | loff_t length, int flags); | |
c2ec175c | 1976 | extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf); |
a9e7f447 | 1977 | extern qsize_t *ext4_get_reserved_space(struct inode *inode); |
5f634d06 AK |
1978 | extern void ext4_da_update_reserve_space(struct inode *inode, |
1979 | int used, int quota_claim); | |
dae1e52c AG |
1980 | |
1981 | /* indirect.c */ | |
1982 | extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode, | |
1983 | struct ext4_map_blocks *map, int flags); | |
1984 | extern ssize_t ext4_ind_direct_IO(int rw, struct kiocb *iocb, | |
1985 | const struct iovec *iov, loff_t offset, | |
1986 | unsigned long nr_segs); | |
1987 | extern int ext4_ind_calc_metadata_amount(struct inode *inode, sector_t lblock); | |
1988 | extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks, int chunk); | |
ff9893dc AG |
1989 | extern void ext4_ind_truncate(struct inode *inode); |
1990 | ||
ac27a0ec | 1991 | /* ioctl.c */ |
5cdd7b2d | 1992 | extern long ext4_ioctl(struct file *, unsigned int, unsigned long); |
af5bc92d | 1993 | extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long); |
ac27a0ec | 1994 | |
c14c6fd5 | 1995 | /* migrate.c */ |
2a43a878 | 1996 | extern int ext4_ext_migrate(struct inode *); |
3d0518f4 | 1997 | |
ac27a0ec | 1998 | /* namei.c */ |
617ba13b MC |
1999 | extern int ext4_orphan_add(handle_t *, struct inode *); |
2000 | extern int ext4_orphan_del(handle_t *, struct inode *); | |
2001 | extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash, | |
ac27a0ec DK |
2002 | __u32 start_minor_hash, __u32 *next_hash); |
2003 | ||
2004 | /* resize.c */ | |
617ba13b MC |
2005 | extern int ext4_group_add(struct super_block *sb, |
2006 | struct ext4_new_group_data *input); | |
2007 | extern int ext4_group_extend(struct super_block *sb, | |
2008 | struct ext4_super_block *es, | |
2009 | ext4_fsblk_t n_blocks_count); | |
19c5246d | 2010 | extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count); |
ac27a0ec DK |
2011 | |
2012 | /* super.c */ | |
a9c47317 DW |
2013 | extern int ext4_superblock_csum_verify(struct super_block *sb, |
2014 | struct ext4_super_block *es); | |
2015 | extern void ext4_superblock_csum_set(struct super_block *sb, | |
2016 | struct ext4_super_block *es); | |
9933fc0a TT |
2017 | extern void *ext4_kvmalloc(size_t size, gfp_t flags); |
2018 | extern void *ext4_kvzalloc(size_t size, gfp_t flags); | |
2019 | extern void ext4_kvfree(void *ptr); | |
b9075fa9 JP |
2020 | extern __printf(4, 5) |
2021 | void __ext4_error(struct super_block *, const char *, unsigned int, | |
2022 | const char *, ...); | |
c398eda0 TT |
2023 | #define ext4_error(sb, message...) __ext4_error(sb, __func__, \ |
2024 | __LINE__, ## message) | |
b9075fa9 JP |
2025 | extern __printf(5, 6) |
2026 | void ext4_error_inode(struct inode *, const char *, unsigned int, ext4_fsblk_t, | |
2027 | const char *, ...); | |
2028 | extern __printf(5, 6) | |
2029 | void ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t, | |
2030 | const char *, ...); | |
c398eda0 TT |
2031 | extern void __ext4_std_error(struct super_block *, const char *, |
2032 | unsigned int, int); | |
b9075fa9 JP |
2033 | extern __printf(4, 5) |
2034 | void __ext4_abort(struct super_block *, const char *, unsigned int, | |
2035 | const char *, ...); | |
c67d859e | 2036 | #define ext4_abort(sb, message...) __ext4_abort(sb, __func__, \ |
c398eda0 | 2037 | __LINE__, ## message) |
b9075fa9 JP |
2038 | extern __printf(4, 5) |
2039 | void __ext4_warning(struct super_block *, const char *, unsigned int, | |
2040 | const char *, ...); | |
c398eda0 TT |
2041 | #define ext4_warning(sb, message...) __ext4_warning(sb, __func__, \ |
2042 | __LINE__, ## message) | |
b9075fa9 JP |
2043 | extern __printf(3, 4) |
2044 | void ext4_msg(struct super_block *, const char *, const char *, ...); | |
c5e06d10 JL |
2045 | extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp, |
2046 | const char *, unsigned int, const char *); | |
2047 | #define dump_mmp_msg(sb, mmp, msg) __dump_mmp_msg(sb, mmp, __func__, \ | |
2048 | __LINE__, msg) | |
b9075fa9 JP |
2049 | extern __printf(7, 8) |
2050 | void __ext4_grp_locked_error(const char *, unsigned int, | |
2051 | struct super_block *, ext4_group_t, | |
2052 | unsigned long, ext4_fsblk_t, | |
2053 | const char *, ...); | |
e29136f8 TT |
2054 | #define ext4_grp_locked_error(sb, grp, message...) \ |
2055 | __ext4_grp_locked_error(__func__, __LINE__, (sb), (grp), ## message) | |
af5bc92d | 2056 | extern void ext4_update_dynamic_rev(struct super_block *sb); |
99e6f829 AK |
2057 | extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb, |
2058 | __u32 compat); | |
2059 | extern int ext4_update_rocompat_feature(handle_t *handle, | |
2060 | struct super_block *sb, __u32 rocompat); | |
2061 | extern int ext4_update_incompat_feature(handle_t *handle, | |
2062 | struct super_block *sb, __u32 incompat); | |
8fadc143 AR |
2063 | extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb, |
2064 | struct ext4_group_desc *bg); | |
2065 | extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb, | |
2066 | struct ext4_group_desc *bg); | |
2067 | extern ext4_fsblk_t ext4_inode_table(struct super_block *sb, | |
2068 | struct ext4_group_desc *bg); | |
021b65bb TT |
2069 | extern __u32 ext4_free_group_clusters(struct super_block *sb, |
2070 | struct ext4_group_desc *bg); | |
560671a0 AK |
2071 | extern __u32 ext4_free_inodes_count(struct super_block *sb, |
2072 | struct ext4_group_desc *bg); | |
2073 | extern __u32 ext4_used_dirs_count(struct super_block *sb, | |
2074 | struct ext4_group_desc *bg); | |
2075 | extern __u32 ext4_itable_unused_count(struct super_block *sb, | |
2076 | struct ext4_group_desc *bg); | |
8fadc143 AR |
2077 | extern void ext4_block_bitmap_set(struct super_block *sb, |
2078 | struct ext4_group_desc *bg, ext4_fsblk_t blk); | |
2079 | extern void ext4_inode_bitmap_set(struct super_block *sb, | |
2080 | struct ext4_group_desc *bg, ext4_fsblk_t blk); | |
2081 | extern void ext4_inode_table_set(struct super_block *sb, | |
2082 | struct ext4_group_desc *bg, ext4_fsblk_t blk); | |
021b65bb TT |
2083 | extern void ext4_free_group_clusters_set(struct super_block *sb, |
2084 | struct ext4_group_desc *bg, | |
2085 | __u32 count); | |
560671a0 AK |
2086 | extern void ext4_free_inodes_set(struct super_block *sb, |
2087 | struct ext4_group_desc *bg, __u32 count); | |
2088 | extern void ext4_used_dirs_set(struct super_block *sb, | |
2089 | struct ext4_group_desc *bg, __u32 count); | |
2090 | extern void ext4_itable_unused_set(struct super_block *sb, | |
2091 | struct ext4_group_desc *bg, __u32 count); | |
bb23c20a TT |
2092 | extern __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 group, |
2093 | struct ext4_group_desc *gdp); | |
2094 | extern int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 group, | |
2095 | struct ext4_group_desc *gdp); | |
bd81d8ee LV |
2096 | |
2097 | static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es) | |
2098 | { | |
2099 | return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) | | |
6bc9feff | 2100 | le32_to_cpu(es->s_blocks_count_lo); |
bd81d8ee LV |
2101 | } |
2102 | ||
2103 | static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es) | |
2104 | { | |
2105 | return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) | | |
308ba3ec | 2106 | le32_to_cpu(es->s_r_blocks_count_lo); |
bd81d8ee LV |
2107 | } |
2108 | ||
2109 | static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es) | |
2110 | { | |
2111 | return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) | | |
308ba3ec | 2112 | le32_to_cpu(es->s_free_blocks_count_lo); |
bd81d8ee LV |
2113 | } |
2114 | ||
2115 | static inline void ext4_blocks_count_set(struct ext4_super_block *es, | |
2116 | ext4_fsblk_t blk) | |
2117 | { | |
6bc9feff | 2118 | es->s_blocks_count_lo = cpu_to_le32((u32)blk); |
bd81d8ee LV |
2119 | es->s_blocks_count_hi = cpu_to_le32(blk >> 32); |
2120 | } | |
2121 | ||
2122 | static inline void ext4_free_blocks_count_set(struct ext4_super_block *es, | |
2123 | ext4_fsblk_t blk) | |
2124 | { | |
308ba3ec | 2125 | es->s_free_blocks_count_lo = cpu_to_le32((u32)blk); |
bd81d8ee LV |
2126 | es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32); |
2127 | } | |
2128 | ||
2129 | static inline void ext4_r_blocks_count_set(struct ext4_super_block *es, | |
2130 | ext4_fsblk_t blk) | |
2131 | { | |
308ba3ec | 2132 | es->s_r_blocks_count_lo = cpu_to_le32((u32)blk); |
bd81d8ee LV |
2133 | es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32); |
2134 | } | |
2135 | ||
a48380f7 AK |
2136 | static inline loff_t ext4_isize(struct ext4_inode *raw_inode) |
2137 | { | |
06a279d6 TT |
2138 | if (S_ISREG(le16_to_cpu(raw_inode->i_mode))) |
2139 | return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) | | |
2140 | le32_to_cpu(raw_inode->i_size_lo); | |
2141 | else | |
2142 | return (loff_t) le32_to_cpu(raw_inode->i_size_lo); | |
a48380f7 | 2143 | } |
bd81d8ee | 2144 | |
a48380f7 AK |
2145 | static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size) |
2146 | { | |
2147 | raw_inode->i_size_lo = cpu_to_le32(i_size); | |
2148 | raw_inode->i_size_high = cpu_to_le32(i_size >> 32); | |
2149 | } | |
ac27a0ec | 2150 | |
c9de560d AT |
2151 | static inline |
2152 | struct ext4_group_info *ext4_get_group_info(struct super_block *sb, | |
af5bc92d | 2153 | ext4_group_t group) |
c9de560d AT |
2154 | { |
2155 | struct ext4_group_info ***grp_info; | |
2156 | long indexv, indexh; | |
2157 | grp_info = EXT4_SB(sb)->s_group_info; | |
2158 | indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb)); | |
2159 | indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1); | |
2160 | return grp_info[indexv][indexh]; | |
2161 | } | |
2162 | ||
8df9675f TT |
2163 | /* |
2164 | * Reading s_groups_count requires using smp_rmb() afterwards. See | |
2165 | * the locking protocol documented in the comments of ext4_group_add() | |
2166 | * in resize.c | |
2167 | */ | |
2168 | static inline ext4_group_t ext4_get_groups_count(struct super_block *sb) | |
2169 | { | |
2170 | ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count; | |
2171 | ||
2172 | smp_rmb(); | |
2173 | return ngroups; | |
2174 | } | |
c9de560d | 2175 | |
772cb7c8 JS |
2176 | static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi, |
2177 | ext4_group_t block_group) | |
2178 | { | |
2179 | return block_group >> sbi->s_log_groups_per_flex; | |
2180 | } | |
2181 | ||
2182 | static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi) | |
2183 | { | |
2184 | return 1 << sbi->s_log_groups_per_flex; | |
2185 | } | |
2186 | ||
617ba13b | 2187 | #define ext4_std_error(sb, errno) \ |
ac27a0ec DK |
2188 | do { \ |
2189 | if ((errno)) \ | |
c398eda0 | 2190 | __ext4_std_error((sb), __func__, __LINE__, (errno)); \ |
ac27a0ec DK |
2191 | } while (0) |
2192 | ||
a30d542a | 2193 | #ifdef CONFIG_SMP |
df55c99d TT |
2194 | /* Each CPU can accumulate percpu_counter_batch clusters in their local |
2195 | * counters. So we need to make sure we have free clusters more | |
179f7ebf | 2196 | * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times. |
a30d542a | 2197 | */ |
df55c99d | 2198 | #define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids)) |
a30d542a | 2199 | #else |
df55c99d | 2200 | #define EXT4_FREECLUSTERS_WATERMARK 0 |
a30d542a AK |
2201 | #endif |
2202 | ||
cf17fea6 AK |
2203 | static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize) |
2204 | { | |
2205 | /* | |
2206 | * XXX: replace with spinlock if seen contended -bzzz | |
2207 | */ | |
2208 | down_write(&EXT4_I(inode)->i_data_sem); | |
2209 | if (newsize > EXT4_I(inode)->i_disksize) | |
2210 | EXT4_I(inode)->i_disksize = newsize; | |
2211 | up_write(&EXT4_I(inode)->i_data_sem); | |
2212 | return ; | |
2213 | } | |
a30d542a | 2214 | |
5d1b1b3f AK |
2215 | struct ext4_group_info { |
2216 | unsigned long bb_state; | |
2217 | struct rb_root bb_free_root; | |
a36b4498 ES |
2218 | ext4_grpblk_t bb_first_free; /* first free block */ |
2219 | ext4_grpblk_t bb_free; /* total free blocks */ | |
2220 | ext4_grpblk_t bb_fragments; /* nr of freespace fragments */ | |
8a57d9d6 | 2221 | ext4_grpblk_t bb_largest_free_order;/* order of largest frag in BG */ |
5d1b1b3f AK |
2222 | struct list_head bb_prealloc_list; |
2223 | #ifdef DOUBLE_CHECK | |
2224 | void *bb_bitmap; | |
2225 | #endif | |
2226 | struct rw_semaphore alloc_sem; | |
a36b4498 ES |
2227 | ext4_grpblk_t bb_counters[]; /* Nr of free power-of-two-block |
2228 | * regions, index is order. | |
2229 | * bb_counters[3] = 5 means | |
2230 | * 5 free 8-block regions. */ | |
5d1b1b3f AK |
2231 | }; |
2232 | ||
3d56b8d2 TM |
2233 | #define EXT4_GROUP_INFO_NEED_INIT_BIT 0 |
2234 | #define EXT4_GROUP_INFO_WAS_TRIMMED_BIT 1 | |
5d1b1b3f AK |
2235 | |
2236 | #define EXT4_MB_GRP_NEED_INIT(grp) \ | |
2237 | (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state))) | |
2238 | ||
3d56b8d2 TM |
2239 | #define EXT4_MB_GRP_WAS_TRIMMED(grp) \ |
2240 | (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) | |
2241 | #define EXT4_MB_GRP_SET_TRIMMED(grp) \ | |
2242 | (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) | |
2243 | #define EXT4_MB_GRP_CLEAR_TRIMMED(grp) \ | |
2244 | (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) | |
2245 | ||
50797481 TT |
2246 | #define EXT4_MAX_CONTENTION 8 |
2247 | #define EXT4_CONTENTION_THRESHOLD 2 | |
2248 | ||
955ce5f5 AK |
2249 | static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb, |
2250 | ext4_group_t group) | |
5d1b1b3f | 2251 | { |
955ce5f5 AK |
2252 | return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group); |
2253 | } | |
5d1b1b3f | 2254 | |
50797481 TT |
2255 | /* |
2256 | * Returns true if the filesystem is busy enough that attempts to | |
2257 | * access the block group locks has run into contention. | |
2258 | */ | |
2259 | static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi) | |
2260 | { | |
2261 | return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD); | |
2262 | } | |
2263 | ||
955ce5f5 AK |
2264 | static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group) |
2265 | { | |
50797481 TT |
2266 | spinlock_t *lock = ext4_group_lock_ptr(sb, group); |
2267 | if (spin_trylock(lock)) | |
2268 | /* | |
2269 | * We're able to grab the lock right away, so drop the | |
2270 | * lock contention counter. | |
2271 | */ | |
2272 | atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0); | |
2273 | else { | |
2274 | /* | |
2275 | * The lock is busy, so bump the contention counter, | |
2276 | * and then wait on the spin lock. | |
2277 | */ | |
2278 | atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1, | |
2279 | EXT4_MAX_CONTENTION); | |
2280 | spin_lock(lock); | |
2281 | } | |
5d1b1b3f AK |
2282 | } |
2283 | ||
2284 | static inline void ext4_unlock_group(struct super_block *sb, | |
2285 | ext4_group_t group) | |
2286 | { | |
955ce5f5 | 2287 | spin_unlock(ext4_group_lock_ptr(sb, group)); |
5d1b1b3f AK |
2288 | } |
2289 | ||
a0375156 TT |
2290 | static inline void ext4_mark_super_dirty(struct super_block *sb) |
2291 | { | |
a9c47317 DW |
2292 | struct ext4_super_block *es = EXT4_SB(sb)->s_es; |
2293 | ||
2294 | ext4_superblock_csum_set(sb, es); | |
a0375156 TT |
2295 | if (EXT4_SB(sb)->s_journal == NULL) |
2296 | sb->s_dirt =1; | |
2297 | } | |
2298 | ||
1f7d1e77 TT |
2299 | /* |
2300 | * Block validity checking | |
2301 | */ | |
2302 | #define ext4_check_indirect_blockref(inode, bh) \ | |
2303 | ext4_check_blockref(__func__, __LINE__, inode, \ | |
2304 | (__le32 *)(bh)->b_data, \ | |
2305 | EXT4_ADDR_PER_BLOCK((inode)->i_sb)) | |
2306 | ||
2307 | #define ext4_ind_check_inode(inode) \ | |
2308 | ext4_check_blockref(__func__, __LINE__, inode, \ | |
2309 | EXT4_I(inode)->i_data, \ | |
2310 | EXT4_NDIR_BLOCKS) | |
2311 | ||
ac27a0ec DK |
2312 | /* |
2313 | * Inodes and files operations | |
2314 | */ | |
2315 | ||
2316 | /* dir.c */ | |
617ba13b | 2317 | extern const struct file_operations ext4_dir_operations; |
ac27a0ec DK |
2318 | |
2319 | /* file.c */ | |
c5ef1c42 | 2320 | extern const struct inode_operations ext4_file_inode_operations; |
617ba13b | 2321 | extern const struct file_operations ext4_file_operations; |
e0d10bfa | 2322 | extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin); |
ac27a0ec DK |
2323 | |
2324 | /* namei.c */ | |
c5ef1c42 AV |
2325 | extern const struct inode_operations ext4_dir_inode_operations; |
2326 | extern const struct inode_operations ext4_special_inode_operations; | |
596397b7 | 2327 | extern struct dentry *ext4_get_parent(struct dentry *child); |
ac27a0ec DK |
2328 | |
2329 | /* symlink.c */ | |
c5ef1c42 AV |
2330 | extern const struct inode_operations ext4_symlink_inode_operations; |
2331 | extern const struct inode_operations ext4_fast_symlink_inode_operations; | |
ac27a0ec | 2332 | |
6fd058f7 TT |
2333 | /* block_validity */ |
2334 | extern void ext4_release_system_zone(struct super_block *sb); | |
2335 | extern int ext4_setup_system_zone(struct super_block *sb); | |
5dabfc78 TT |
2336 | extern int __init ext4_init_system_zone(void); |
2337 | extern void ext4_exit_system_zone(void); | |
6fd058f7 TT |
2338 | extern int ext4_data_block_valid(struct ext4_sb_info *sbi, |
2339 | ext4_fsblk_t start_blk, | |
2340 | unsigned int count); | |
1f7d1e77 TT |
2341 | extern int ext4_check_blockref(const char *, unsigned int, |
2342 | struct inode *, __le32 *, unsigned int); | |
6fd058f7 | 2343 | |
a86c6181 AT |
2344 | /* extents.c */ |
2345 | extern int ext4_ext_tree_init(handle_t *handle, struct inode *); | |
2346 | extern int ext4_ext_writepage_trans_blocks(struct inode *, int); | |
a02908f1 MC |
2347 | extern int ext4_ext_index_trans_blocks(struct inode *inode, int nrblocks, |
2348 | int chunk); | |
e35fd660 TT |
2349 | extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode, |
2350 | struct ext4_map_blocks *map, int flags); | |
cf108bca | 2351 | extern void ext4_ext_truncate(struct inode *); |
a4bb6b64 AH |
2352 | extern int ext4_ext_punch_hole(struct file *file, loff_t offset, |
2353 | loff_t length); | |
a86c6181 AT |
2354 | extern void ext4_ext_init(struct super_block *); |
2355 | extern void ext4_ext_release(struct super_block *); | |
2fe17c10 | 2356 | extern long ext4_fallocate(struct file *file, int mode, loff_t offset, |
a2df2a63 | 2357 | loff_t len); |
0031462b | 2358 | extern int ext4_convert_unwritten_extents(struct inode *inode, loff_t offset, |
a1de02dc | 2359 | ssize_t len); |
e35fd660 TT |
2360 | extern int ext4_map_blocks(handle_t *handle, struct inode *inode, |
2361 | struct ext4_map_blocks *map, int flags); | |
3a06d778 AK |
2362 | extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, |
2363 | __u64 start, __u64 len); | |
748de673 AF |
2364 | /* move_extent.c */ |
2365 | extern int ext4_move_extents(struct file *o_filp, struct file *d_filp, | |
2366 | __u64 start_orig, __u64 start_donor, | |
2367 | __u64 len, __u64 *moved_len); | |
2368 | ||
bd2d0210 | 2369 | /* page-io.c */ |
5dabfc78 TT |
2370 | extern int __init ext4_init_pageio(void); |
2371 | extern void ext4_exit_pageio(void); | |
f7ad6d2e | 2372 | extern void ext4_ioend_wait(struct inode *); |
bd2d0210 TT |
2373 | extern void ext4_free_io_end(ext4_io_end_t *io); |
2374 | extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags); | |
2375 | extern int ext4_end_io_nolock(ext4_io_end_t *io); | |
2376 | extern void ext4_io_submit(struct ext4_io_submit *io); | |
2377 | extern int ext4_bio_write_page(struct ext4_io_submit *io, | |
2378 | struct page *page, | |
2379 | int len, | |
2380 | struct writeback_control *wbc); | |
3a06d778 | 2381 | |
c5e06d10 JL |
2382 | /* mmp.c */ |
2383 | extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t); | |
2384 | ||
744692dc JZ |
2385 | /* BH_Uninit flag: blocks are allocated but uninitialized on disk */ |
2386 | enum ext4_state_bits { | |
2387 | BH_Uninit /* blocks are allocated but uninitialized on disk */ | |
2388 | = BH_JBDPrivateStart, | |
7b415bf6 AK |
2389 | BH_AllocFromCluster, /* allocated blocks were part of already |
2390 | * allocated cluster. Note that this flag will | |
2391 | * never, ever appear in a buffer_head's state | |
2392 | * flag. See EXT4_MAP_FROM_CLUSTER to see where | |
2393 | * this is used. */ | |
5356f261 AK |
2394 | BH_Da_Mapped, /* Delayed allocated block that now has a mapping. This |
2395 | * flag is set when ext4_map_blocks is called on a | |
2396 | * delayed allocated block to get its real mapping. */ | |
744692dc JZ |
2397 | }; |
2398 | ||
2399 | BUFFER_FNS(Uninit, uninit) | |
2400 | TAS_BUFFER_FNS(Uninit, uninit) | |
5356f261 | 2401 | BUFFER_FNS(Da_Mapped, da_mapped) |
744692dc | 2402 | |
2ccb5fb9 AK |
2403 | /* |
2404 | * Add new method to test wether block and inode bitmaps are properly | |
2405 | * initialized. With uninit_bg reading the block from disk is not enough | |
2406 | * to mark the bitmap uptodate. We need to also zero-out the bitmap | |
2407 | */ | |
2408 | #define BH_BITMAP_UPTODATE BH_JBDPrivateStart | |
2409 | ||
2410 | static inline int bitmap_uptodate(struct buffer_head *bh) | |
2411 | { | |
2412 | return (buffer_uptodate(bh) && | |
2413 | test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state)); | |
2414 | } | |
2415 | static inline void set_bitmap_uptodate(struct buffer_head *bh) | |
2416 | { | |
2417 | set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state); | |
2418 | } | |
2419 | ||
731eb1a0 AM |
2420 | #define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1) |
2421 | ||
e9e3bcec ES |
2422 | /* For ioend & aio unwritten conversion wait queues */ |
2423 | #define EXT4_WQ_HASH_SZ 37 | |
2424 | #define ext4_ioend_wq(v) (&ext4__ioend_wq[((unsigned long)(v)) %\ | |
2425 | EXT4_WQ_HASH_SZ]) | |
2426 | #define ext4_aio_mutex(v) (&ext4__aio_mutex[((unsigned long)(v)) %\ | |
2427 | EXT4_WQ_HASH_SZ]) | |
2428 | extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ]; | |
2429 | extern struct mutex ext4__aio_mutex[EXT4_WQ_HASH_SZ]; | |
2430 | ||
8f82f840 YY |
2431 | #define EXT4_RESIZING 0 |
2432 | extern int ext4_resize_begin(struct super_block *sb); | |
2433 | extern void ext4_resize_end(struct super_block *sb); | |
2434 | ||
ac27a0ec DK |
2435 | #endif /* __KERNEL__ */ |
2436 | ||
d8990240 AK |
2437 | #include "ext4_extents.h" |
2438 | ||
3dcf5451 | 2439 | #endif /* _EXT4_H */ |