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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> | |
4d92dc0f BH |
32 | #ifdef __KERNEL__ |
33 | #include <linux/compat.h> | |
34 | #endif | |
c9de560d | 35 | |
ac27a0ec | 36 | /* |
8a35694e | 37 | * The fourth extended filesystem constants/structures |
ac27a0ec DK |
38 | */ |
39 | ||
40 | /* | |
617ba13b | 41 | * Define EXT4FS_DEBUG to produce debug messages |
ac27a0ec | 42 | */ |
617ba13b | 43 | #undef EXT4FS_DEBUG |
ac27a0ec | 44 | |
ac27a0ec DK |
45 | /* |
46 | * Debug code | |
47 | */ | |
617ba13b MC |
48 | #ifdef EXT4FS_DEBUG |
49 | #define ext4_debug(f, a...) \ | |
ac27a0ec | 50 | do { \ |
af5bc92d | 51 | printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \ |
4db9c54a | 52 | __FILE__, __LINE__, __func__); \ |
af5bc92d | 53 | printk(KERN_DEBUG f, ## a); \ |
ac27a0ec DK |
54 | } while (0) |
55 | #else | |
617ba13b | 56 | #define ext4_debug(f, a...) do {} while (0) |
ac27a0ec DK |
57 | #endif |
58 | ||
273df556 | 59 | #define EXT4_ERROR_INODE(inode, fmt, a...) \ |
c398eda0 TT |
60 | ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a) |
61 | ||
62 | #define EXT4_ERROR_INODE_BLOCK(inode, block, fmt, a...) \ | |
63 | ext4_error_inode((inode), __func__, __LINE__, (block), (fmt), ## a) | |
273df556 | 64 | |
f7c21177 TT |
65 | #define EXT4_ERROR_FILE(file, block, fmt, a...) \ |
66 | ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a) | |
273df556 | 67 | |
d444c3c3 TT |
68 | /* data type for block offset of block group */ |
69 | typedef int ext4_grpblk_t; | |
70 | ||
71 | /* data type for filesystem-wide blocks number */ | |
72 | typedef unsigned long long ext4_fsblk_t; | |
73 | ||
74 | /* data type for file logical block number */ | |
75 | typedef __u32 ext4_lblk_t; | |
76 | ||
77 | /* data type for block group number */ | |
78 | typedef unsigned int ext4_group_t; | |
79 | ||
296c355c | 80 | /* |
60e6679e | 81 | * Flags used in mballoc's allocation_context flags field. |
296c355c TT |
82 | * |
83 | * Also used to show what's going on for debugging purposes when the | |
84 | * flag field is exported via the traceport interface | |
85 | */ | |
d444c3c3 | 86 | |
c9de560d | 87 | /* prefer goal again. length */ |
0ef90db9 | 88 | #define EXT4_MB_HINT_MERGE 0x0001 |
c9de560d | 89 | /* blocks already reserved */ |
0ef90db9 | 90 | #define EXT4_MB_HINT_RESERVED 0x0002 |
c9de560d | 91 | /* metadata is being allocated */ |
0ef90db9 | 92 | #define EXT4_MB_HINT_METADATA 0x0004 |
c9de560d | 93 | /* first blocks in the file */ |
0ef90db9 | 94 | #define EXT4_MB_HINT_FIRST 0x0008 |
c9de560d | 95 | /* search for the best chunk */ |
0ef90db9 | 96 | #define EXT4_MB_HINT_BEST 0x0010 |
c9de560d | 97 | /* data is being allocated */ |
0ef90db9 | 98 | #define EXT4_MB_HINT_DATA 0x0020 |
c9de560d | 99 | /* don't preallocate (for tails) */ |
0ef90db9 | 100 | #define EXT4_MB_HINT_NOPREALLOC 0x0040 |
c9de560d | 101 | /* allocate for locality group */ |
0ef90db9 | 102 | #define EXT4_MB_HINT_GROUP_ALLOC 0x0080 |
c9de560d | 103 | /* allocate goal blocks or none */ |
0ef90db9 | 104 | #define EXT4_MB_HINT_GOAL_ONLY 0x0100 |
c9de560d | 105 | /* goal is meaningful */ |
0ef90db9 | 106 | #define EXT4_MB_HINT_TRY_GOAL 0x0200 |
d2a17637 | 107 | /* blocks already pre-reserved by delayed allocation */ |
0ef90db9 | 108 | #define EXT4_MB_DELALLOC_RESERVED 0x0400 |
4ba74d00 TT |
109 | /* We are doing stream allocation */ |
110 | #define EXT4_MB_STREAM_ALLOC 0x0800 | |
55f020db AH |
111 | /* Use reserved root blocks if needed */ |
112 | #define EXT4_MB_USE_ROOT_BLOCKS 0x1000 | |
c9de560d AT |
113 | |
114 | struct ext4_allocation_request { | |
115 | /* target inode for block we're allocating */ | |
116 | struct inode *inode; | |
726447d8 ES |
117 | /* how many blocks we want to allocate */ |
118 | unsigned int len; | |
c9de560d AT |
119 | /* logical block in target inode */ |
120 | ext4_lblk_t logical; | |
c9de560d AT |
121 | /* the closest logical allocated block to the left */ |
122 | ext4_lblk_t lleft; | |
c9de560d AT |
123 | /* the closest logical allocated block to the right */ |
124 | ext4_lblk_t lright; | |
726447d8 ES |
125 | /* phys. target (a hint) */ |
126 | ext4_fsblk_t goal; | |
127 | /* phys. block for the closest logical allocated block to the left */ | |
128 | ext4_fsblk_t pleft; | |
129 | /* phys. block for the closest logical allocated block to the right */ | |
c9de560d | 130 | ext4_fsblk_t pright; |
c9de560d | 131 | /* flags. see above EXT4_MB_HINT_* */ |
498e5f24 | 132 | unsigned int flags; |
c9de560d AT |
133 | }; |
134 | ||
e35fd660 TT |
135 | /* |
136 | * Logical to physical block mapping, used by ext4_map_blocks() | |
137 | * | |
138 | * This structure is used to pass requests into ext4_map_blocks() as | |
139 | * well as to store the information returned by ext4_map_blocks(). It | |
140 | * takes less room on the stack than a struct buffer_head. | |
141 | */ | |
142 | #define EXT4_MAP_NEW (1 << BH_New) | |
143 | #define EXT4_MAP_MAPPED (1 << BH_Mapped) | |
144 | #define EXT4_MAP_UNWRITTEN (1 << BH_Unwritten) | |
145 | #define EXT4_MAP_BOUNDARY (1 << BH_Boundary) | |
146 | #define EXT4_MAP_UNINIT (1 << BH_Uninit) | |
7b415bf6 AK |
147 | /* Sometimes (in the bigalloc case, from ext4_da_get_block_prep) the caller of |
148 | * ext4_map_blocks wants to know whether or not the underlying cluster has | |
149 | * already been accounted for. EXT4_MAP_FROM_CLUSTER conveys to the caller that | |
150 | * the requested mapping was from previously mapped (or delayed allocated) | |
151 | * cluster. We use BH_AllocFromCluster only for this flag. BH_AllocFromCluster | |
152 | * should never appear on buffer_head's state flags. | |
153 | */ | |
154 | #define EXT4_MAP_FROM_CLUSTER (1 << BH_AllocFromCluster) | |
e35fd660 TT |
155 | #define EXT4_MAP_FLAGS (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\ |
156 | EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY |\ | |
7b415bf6 | 157 | EXT4_MAP_UNINIT | EXT4_MAP_FROM_CLUSTER) |
e35fd660 TT |
158 | |
159 | struct ext4_map_blocks { | |
160 | ext4_fsblk_t m_pblk; | |
161 | ext4_lblk_t m_lblk; | |
162 | unsigned int m_len; | |
163 | unsigned int m_flags; | |
164 | }; | |
165 | ||
b3a3ca8c TT |
166 | /* |
167 | * For delayed allocation tracking | |
168 | */ | |
169 | struct mpage_da_data { | |
170 | struct inode *inode; | |
171 | sector_t b_blocknr; /* start block number of extent */ | |
172 | size_t b_size; /* size of extent */ | |
173 | unsigned long b_state; /* state of the extent */ | |
174 | unsigned long first_page, next_page; /* extent of pages */ | |
175 | struct writeback_control *wbc; | |
176 | int io_done; | |
177 | int pages_written; | |
178 | int retval; | |
179 | }; | |
bd2d0210 TT |
180 | |
181 | /* | |
182 | * Flags for ext4_io_end->flags | |
183 | */ | |
184 | #define EXT4_IO_END_UNWRITTEN 0x0001 | |
185 | #define EXT4_IO_END_ERROR 0x0002 | |
8c0bec21 | 186 | #define EXT4_IO_END_QUEUED 0x0004 |
266991b1 | 187 | #define EXT4_IO_END_DIRECT 0x0008 |
491caa43 | 188 | #define EXT4_IO_END_IN_FSYNC 0x0010 |
bd2d0210 TT |
189 | |
190 | struct ext4_io_page { | |
191 | struct page *p_page; | |
83668e71 | 192 | atomic_t p_count; |
bd2d0210 TT |
193 | }; |
194 | ||
195 | #define MAX_IO_PAGES 128 | |
196 | ||
0031462b | 197 | typedef struct ext4_io_end { |
5b3ff237 | 198 | struct list_head list; /* per-file finished IO list */ |
0031462b | 199 | struct inode *inode; /* file being written to */ |
8d5d02e6 | 200 | unsigned int flag; /* unwritten or not */ |
744692dc | 201 | struct page *page; /* page struct for buffer write */ |
a1de02dc ES |
202 | loff_t offset; /* offset in the file */ |
203 | ssize_t size; /* size of the extent */ | |
0031462b | 204 | struct work_struct work; /* data work queue */ |
5b3ff237 JZ |
205 | struct kiocb *iocb; /* iocb struct for AIO */ |
206 | int result; /* error value for AIO */ | |
bd2d0210 TT |
207 | int num_io_pages; |
208 | struct ext4_io_page *pages[MAX_IO_PAGES]; | |
0031462b MC |
209 | } ext4_io_end_t; |
210 | ||
bd2d0210 TT |
211 | struct ext4_io_submit { |
212 | int io_op; | |
213 | struct bio *io_bio; | |
214 | ext4_io_end_t *io_end; | |
215 | struct ext4_io_page *io_page; | |
216 | sector_t io_next_block; | |
217 | }; | |
218 | ||
ac27a0ec DK |
219 | /* |
220 | * Special inodes numbers | |
221 | */ | |
617ba13b MC |
222 | #define EXT4_BAD_INO 1 /* Bad blocks inode */ |
223 | #define EXT4_ROOT_INO 2 /* Root inode */ | |
ae812306 AK |
224 | #define EXT4_USR_QUOTA_INO 3 /* User quota inode */ |
225 | #define EXT4_GRP_QUOTA_INO 4 /* Group quota inode */ | |
617ba13b MC |
226 | #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */ |
227 | #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */ | |
228 | #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */ | |
229 | #define EXT4_JOURNAL_INO 8 /* Journal inode */ | |
ac27a0ec | 230 | |
617ba13b MC |
231 | /* First non-reserved inode for old ext4 filesystems */ |
232 | #define EXT4_GOOD_OLD_FIRST_INO 11 | |
ac27a0ec DK |
233 | |
234 | /* | |
235 | * Maximal count of links to a file | |
236 | */ | |
f8628a14 | 237 | #define EXT4_LINK_MAX 65000 |
ac27a0ec DK |
238 | |
239 | /* | |
240 | * Macro-instructions used to manage several block sizes | |
241 | */ | |
617ba13b | 242 | #define EXT4_MIN_BLOCK_SIZE 1024 |
afc7cbca TS |
243 | #define EXT4_MAX_BLOCK_SIZE 65536 |
244 | #define EXT4_MIN_BLOCK_LOG_SIZE 10 | |
fb1813f4 | 245 | #define EXT4_MAX_BLOCK_LOG_SIZE 16 |
ac27a0ec | 246 | #ifdef __KERNEL__ |
617ba13b | 247 | # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize) |
ac27a0ec | 248 | #else |
617ba13b | 249 | # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size) |
ac27a0ec | 250 | #endif |
af5bc92d | 251 | #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32)) |
281b5995 TT |
252 | #define EXT4_CLUSTER_SIZE(s) (EXT4_BLOCK_SIZE(s) << \ |
253 | EXT4_SB(s)->s_cluster_bits) | |
ac27a0ec | 254 | #ifdef __KERNEL__ |
617ba13b | 255 | # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits) |
281b5995 | 256 | # define EXT4_CLUSTER_BITS(s) (EXT4_SB(s)->s_cluster_bits) |
ac27a0ec | 257 | #else |
617ba13b | 258 | # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10) |
ac27a0ec DK |
259 | #endif |
260 | #ifdef __KERNEL__ | |
617ba13b MC |
261 | #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits) |
262 | #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size) | |
263 | #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino) | |
ac27a0ec | 264 | #else |
617ba13b MC |
265 | #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ |
266 | EXT4_GOOD_OLD_INODE_SIZE : \ | |
ac27a0ec | 267 | (s)->s_inode_size) |
617ba13b MC |
268 | #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ |
269 | EXT4_GOOD_OLD_FIRST_INO : \ | |
ac27a0ec DK |
270 | (s)->s_first_ino) |
271 | #endif | |
a2df2a63 | 272 | #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits))) |
ac27a0ec | 273 | |
d5b8f310 TT |
274 | /* Translate a block number to a cluster number */ |
275 | #define EXT4_B2C(sbi, blk) ((blk) >> (sbi)->s_cluster_bits) | |
276 | /* Translate a cluster number to a block number */ | |
277 | #define EXT4_C2B(sbi, cluster) ((cluster) << (sbi)->s_cluster_bits) | |
278 | /* Translate # of blks to # of clusters */ | |
279 | #define EXT4_NUM_B2C(sbi, blks) (((blks) + (sbi)->s_cluster_ratio - 1) >> \ | |
280 | (sbi)->s_cluster_bits) | |
281 | ||
ac27a0ec DK |
282 | /* |
283 | * Structure of a blocks group descriptor | |
284 | */ | |
617ba13b | 285 | struct ext4_group_desc |
ac27a0ec | 286 | { |
3a14589c | 287 | __le32 bg_block_bitmap_lo; /* Blocks bitmap block */ |
5272f837 AK |
288 | __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */ |
289 | __le32 bg_inode_table_lo; /* Inodes table block */ | |
560671a0 AK |
290 | __le16 bg_free_blocks_count_lo;/* Free blocks count */ |
291 | __le16 bg_free_inodes_count_lo;/* Free inodes count */ | |
292 | __le16 bg_used_dirs_count_lo; /* Directories count */ | |
717d50e4 AD |
293 | __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */ |
294 | __u32 bg_reserved[2]; /* Likely block/inode bitmap checksum */ | |
560671a0 | 295 | __le16 bg_itable_unused_lo; /* Unused inodes count */ |
717d50e4 | 296 | __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */ |
8fadc143 AR |
297 | __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */ |
298 | __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */ | |
299 | __le32 bg_inode_table_hi; /* Inodes table block MSB */ | |
91b51a01 CL |
300 | __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */ |
301 | __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */ | |
302 | __le16 bg_used_dirs_count_hi; /* Directories count MSB */ | |
560671a0 | 303 | __le16 bg_itable_unused_hi; /* Unused inodes count MSB */ |
91b51a01 | 304 | __u32 bg_reserved2[3]; |
ac27a0ec DK |
305 | }; |
306 | ||
772cb7c8 JS |
307 | /* |
308 | * Structure of a flex block group info | |
309 | */ | |
310 | ||
311 | struct flex_groups { | |
9f24e420 | 312 | atomic_t free_inodes; |
24aaa8ef | 313 | atomic_t free_clusters; |
7d39db14 | 314 | atomic_t used_dirs; |
772cb7c8 JS |
315 | }; |
316 | ||
717d50e4 AD |
317 | #define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */ |
318 | #define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */ | |
319 | #define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */ | |
320 | ||
ac27a0ec DK |
321 | /* |
322 | * Macro-instructions used to manage group descriptors | |
323 | */ | |
0d1ee42f | 324 | #define EXT4_MIN_DESC_SIZE 32 |
8fadc143 | 325 | #define EXT4_MIN_DESC_SIZE_64BIT 64 |
0d1ee42f AR |
326 | #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE |
327 | #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size) | |
ac27a0ec | 328 | #ifdef __KERNEL__ |
617ba13b | 329 | # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group) |
281b5995 | 330 | # define EXT4_CLUSTERS_PER_GROUP(s) (EXT4_SB(s)->s_clusters_per_group) |
617ba13b MC |
331 | # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block) |
332 | # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group) | |
333 | # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits) | |
ac27a0ec | 334 | #else |
617ba13b | 335 | # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group) |
0d1ee42f | 336 | # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s)) |
617ba13b | 337 | # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group) |
ac27a0ec DK |
338 | #endif |
339 | ||
340 | /* | |
341 | * Constants relative to the data blocks | |
342 | */ | |
617ba13b MC |
343 | #define EXT4_NDIR_BLOCKS 12 |
344 | #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS | |
345 | #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1) | |
346 | #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1) | |
347 | #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1) | |
ac27a0ec DK |
348 | |
349 | /* | |
350 | * Inode flags | |
351 | */ | |
617ba13b MC |
352 | #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */ |
353 | #define EXT4_UNRM_FL 0x00000002 /* Undelete */ | |
354 | #define EXT4_COMPR_FL 0x00000004 /* Compress file */ | |
355 | #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */ | |
356 | #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */ | |
357 | #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */ | |
358 | #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */ | |
359 | #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */ | |
ac27a0ec | 360 | /* Reserved for compression usage... */ |
617ba13b MC |
361 | #define EXT4_DIRTY_FL 0x00000100 |
362 | #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ | |
363 | #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */ | |
364 | #define EXT4_ECOMPR_FL 0x00000800 /* Compression error */ | |
ac27a0ec | 365 | /* End compression flags --- maybe not all used */ |
617ba13b MC |
366 | #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */ |
367 | #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */ | |
368 | #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */ | |
369 | #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */ | |
370 | #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */ | |
371 | #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/ | |
8180a562 | 372 | #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */ |
a86c6181 | 373 | #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */ |
f710b4b9 | 374 | #define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */ |
c8d46e41 | 375 | #define EXT4_EOFBLOCKS_FL 0x00400000 /* Blocks allocated beyond EOF */ |
8180a562 | 376 | #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */ |
ac27a0ec | 377 | |
c8d46e41 JZ |
378 | #define EXT4_FL_USER_VISIBLE 0x004BDFFF /* User visible flags */ |
379 | #define EXT4_FL_USER_MODIFIABLE 0x004B80FF /* User modifiable flags */ | |
ac27a0ec | 380 | |
8fa43a81 DG |
381 | /* Flags that should be inherited by new inodes from their parent. */ |
382 | #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\ | |
1cd9f097 | 383 | EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\ |
8fa43a81 DG |
384 | EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\ |
385 | EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL) | |
386 | ||
2dc6b0d4 DG |
387 | /* Flags that are appropriate for regular files (all but dir-specific ones). */ |
388 | #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL)) | |
389 | ||
390 | /* Flags that are appropriate for non-directories/regular files. */ | |
391 | #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL) | |
392 | ||
393 | /* Mask out flags that are inappropriate for the given type of inode. */ | |
394 | static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags) | |
395 | { | |
396 | if (S_ISDIR(mode)) | |
397 | return flags; | |
398 | else if (S_ISREG(mode)) | |
399 | return flags & EXT4_REG_FLMASK; | |
400 | else | |
401 | return flags & EXT4_OTHER_FLMASK; | |
402 | } | |
403 | ||
12e9b892 DM |
404 | /* |
405 | * Inode flags used for atomic set/get | |
406 | */ | |
407 | enum { | |
408 | EXT4_INODE_SECRM = 0, /* Secure deletion */ | |
409 | EXT4_INODE_UNRM = 1, /* Undelete */ | |
410 | EXT4_INODE_COMPR = 2, /* Compress file */ | |
411 | EXT4_INODE_SYNC = 3, /* Synchronous updates */ | |
412 | EXT4_INODE_IMMUTABLE = 4, /* Immutable file */ | |
413 | EXT4_INODE_APPEND = 5, /* writes to file may only append */ | |
414 | EXT4_INODE_NODUMP = 6, /* do not dump file */ | |
415 | EXT4_INODE_NOATIME = 7, /* do not update atime */ | |
416 | /* Reserved for compression usage... */ | |
417 | EXT4_INODE_DIRTY = 8, | |
418 | EXT4_INODE_COMPRBLK = 9, /* One or more compressed clusters */ | |
419 | EXT4_INODE_NOCOMPR = 10, /* Don't compress */ | |
420 | EXT4_INODE_ECOMPR = 11, /* Compression error */ | |
421 | /* End compression flags --- maybe not all used */ | |
422 | EXT4_INODE_INDEX = 12, /* hash-indexed directory */ | |
423 | EXT4_INODE_IMAGIC = 13, /* AFS directory */ | |
424 | EXT4_INODE_JOURNAL_DATA = 14, /* file data should be journaled */ | |
425 | EXT4_INODE_NOTAIL = 15, /* file tail should not be merged */ | |
426 | EXT4_INODE_DIRSYNC = 16, /* dirsync behaviour (directories only) */ | |
427 | EXT4_INODE_TOPDIR = 17, /* Top of directory hierarchies*/ | |
428 | EXT4_INODE_HUGE_FILE = 18, /* Set to each huge file */ | |
429 | EXT4_INODE_EXTENTS = 19, /* Inode uses extents */ | |
430 | EXT4_INODE_EA_INODE = 21, /* Inode used for large EA */ | |
431 | EXT4_INODE_EOFBLOCKS = 22, /* Blocks allocated beyond EOF */ | |
432 | EXT4_INODE_RESERVED = 31, /* reserved for ext4 lib */ | |
433 | }; | |
434 | ||
435 | #define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG)) | |
436 | #define CHECK_FLAG_VALUE(FLAG) if (!TEST_FLAG_VALUE(FLAG)) { \ | |
437 | printk(KERN_EMERG "EXT4 flag fail: " #FLAG ": %d %d\n", \ | |
438 | EXT4_##FLAG##_FL, EXT4_INODE_##FLAG); BUG_ON(1); } | |
439 | ||
440 | /* | |
441 | * Since it's pretty easy to mix up bit numbers and hex values, and we | |
442 | * can't do a compile-time test for ENUM values, we use a run-time | |
443 | * test to make sure that EXT4_XXX_FL is consistent with respect to | |
444 | * EXT4_INODE_XXX. If all is well the printk and BUG_ON will all drop | |
445 | * out so it won't cost any extra space in the compiled kernel image. | |
446 | * But it's important that these values are the same, since we are | |
447 | * using EXT4_INODE_XXX to test for the flag values, but EXT4_XX_FL | |
448 | * must be consistent with the values of FS_XXX_FL defined in | |
449 | * include/linux/fs.h and the on-disk values found in ext2, ext3, and | |
450 | * ext4 filesystems, and of course the values defined in e2fsprogs. | |
451 | * | |
452 | * It's not paranoia if the Murphy's Law really *is* out to get you. :-) | |
453 | */ | |
454 | static inline void ext4_check_flag_values(void) | |
455 | { | |
456 | CHECK_FLAG_VALUE(SECRM); | |
457 | CHECK_FLAG_VALUE(UNRM); | |
458 | CHECK_FLAG_VALUE(COMPR); | |
459 | CHECK_FLAG_VALUE(SYNC); | |
460 | CHECK_FLAG_VALUE(IMMUTABLE); | |
461 | CHECK_FLAG_VALUE(APPEND); | |
462 | CHECK_FLAG_VALUE(NODUMP); | |
463 | CHECK_FLAG_VALUE(NOATIME); | |
464 | CHECK_FLAG_VALUE(DIRTY); | |
465 | CHECK_FLAG_VALUE(COMPRBLK); | |
466 | CHECK_FLAG_VALUE(NOCOMPR); | |
467 | CHECK_FLAG_VALUE(ECOMPR); | |
468 | CHECK_FLAG_VALUE(INDEX); | |
469 | CHECK_FLAG_VALUE(IMAGIC); | |
470 | CHECK_FLAG_VALUE(JOURNAL_DATA); | |
471 | CHECK_FLAG_VALUE(NOTAIL); | |
472 | CHECK_FLAG_VALUE(DIRSYNC); | |
473 | CHECK_FLAG_VALUE(TOPDIR); | |
474 | CHECK_FLAG_VALUE(HUGE_FILE); | |
475 | CHECK_FLAG_VALUE(EXTENTS); | |
476 | CHECK_FLAG_VALUE(EA_INODE); | |
477 | CHECK_FLAG_VALUE(EOFBLOCKS); | |
478 | CHECK_FLAG_VALUE(RESERVED); | |
479 | } | |
480 | ||
ac27a0ec | 481 | /* Used to pass group descriptor data when online resize is done */ |
617ba13b | 482 | struct ext4_new_group_input { |
8c55e204 DK |
483 | __u32 group; /* Group number for this data */ |
484 | __u64 block_bitmap; /* Absolute block number of block bitmap */ | |
485 | __u64 inode_bitmap; /* Absolute block number of inode bitmap */ | |
486 | __u64 inode_table; /* Absolute block number of inode table start */ | |
487 | __u32 blocks_count; /* Total number of blocks in this group */ | |
488 | __u16 reserved_blocks; /* Number of reserved blocks in this group */ | |
ac27a0ec DK |
489 | __u16 unused; |
490 | }; | |
491 | ||
4d92dc0f BH |
492 | #if defined(__KERNEL__) && defined(CONFIG_COMPAT) |
493 | struct compat_ext4_new_group_input { | |
494 | u32 group; | |
495 | compat_u64 block_bitmap; | |
496 | compat_u64 inode_bitmap; | |
497 | compat_u64 inode_table; | |
498 | u32 blocks_count; | |
499 | u16 reserved_blocks; | |
500 | u16 unused; | |
501 | }; | |
502 | #endif | |
503 | ||
617ba13b MC |
504 | /* The struct ext4_new_group_input in kernel space, with free_blocks_count */ |
505 | struct ext4_new_group_data { | |
ac27a0ec | 506 | __u32 group; |
bd81d8ee LV |
507 | __u64 block_bitmap; |
508 | __u64 inode_bitmap; | |
509 | __u64 inode_table; | |
ac27a0ec DK |
510 | __u32 blocks_count; |
511 | __u16 reserved_blocks; | |
512 | __u16 unused; | |
513 | __u32 free_blocks_count; | |
514 | }; | |
515 | ||
33afdcc5 YY |
516 | /* Indexes used to index group tables in ext4_new_group_data */ |
517 | enum { | |
518 | BLOCK_BITMAP = 0, /* block bitmap */ | |
519 | INODE_BITMAP, /* inode bitmap */ | |
520 | INODE_TABLE, /* inode tables */ | |
521 | GROUP_TABLE_COUNT, | |
522 | }; | |
523 | ||
a2df2a63 | 524 | /* |
79e83036 | 525 | * Flags used by ext4_map_blocks() |
a2df2a63 | 526 | */ |
c2177057 TT |
527 | /* Allocate any needed blocks and/or convert an unitialized |
528 | extent to be an initialized ext4 */ | |
2ac3b6e0 | 529 | #define EXT4_GET_BLOCKS_CREATE 0x0001 |
c2177057 | 530 | /* Request the creation of an unitialized extent */ |
2ac3b6e0 | 531 | #define EXT4_GET_BLOCKS_UNINIT_EXT 0x0002 |
c2177057 TT |
532 | #define EXT4_GET_BLOCKS_CREATE_UNINIT_EXT (EXT4_GET_BLOCKS_UNINIT_EXT|\ |
533 | EXT4_GET_BLOCKS_CREATE) | |
c2177057 | 534 | /* Caller is from the delayed allocation writeout path, |
60e6679e | 535 | so set the magic i_delalloc_reserve_flag after taking the |
2ac3b6e0 | 536 | inode allocation semaphore for */ |
03f5d8bc | 537 | #define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004 |
0031462b MC |
538 | /* caller is from the direct IO path, request to creation of an |
539 | unitialized extents if not allocated, split the uninitialized | |
540 | extent if blocks has been preallocated already*/ | |
c7064ef1 | 541 | #define EXT4_GET_BLOCKS_PRE_IO 0x0008 |
1296cc85 | 542 | #define EXT4_GET_BLOCKS_CONVERT 0x0010 |
c7064ef1 | 543 | #define EXT4_GET_BLOCKS_IO_CREATE_EXT (EXT4_GET_BLOCKS_PRE_IO|\ |
0031462b | 544 | EXT4_GET_BLOCKS_CREATE_UNINIT_EXT) |
c7064ef1 JZ |
545 | /* Convert extent to initialized after IO complete */ |
546 | #define EXT4_GET_BLOCKS_IO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT|\ | |
0031462b | 547 | EXT4_GET_BLOCKS_CREATE_UNINIT_EXT) |
55f020db AH |
548 | /* Punch out blocks of an extent */ |
549 | #define EXT4_GET_BLOCKS_PUNCH_OUT_EXT 0x0020 | |
556b27ab VH |
550 | /* Don't normalize allocation size (used for fallocate) */ |
551 | #define EXT4_GET_BLOCKS_NO_NORMALIZE 0x0040 | |
a4e5d88b DM |
552 | /* Request will not result in inode size update (user for fallocate) */ |
553 | #define EXT4_GET_BLOCKS_KEEP_SIZE 0x0080 | |
ac27a0ec | 554 | |
e6362609 TT |
555 | /* |
556 | * Flags used by ext4_free_blocks | |
557 | */ | |
558 | #define EXT4_FREE_BLOCKS_METADATA 0x0001 | |
559 | #define EXT4_FREE_BLOCKS_FORGET 0x0002 | |
1f2acb60 | 560 | #define EXT4_FREE_BLOCKS_VALIDATED 0x0004 |
7132de74 | 561 | #define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE 0x0008 |
84130193 TT |
562 | #define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER 0x0010 |
563 | #define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER 0x0020 | |
e6362609 | 564 | |
4e96b2db AH |
565 | /* |
566 | * Flags used by ext4_discard_partial_page_buffers | |
567 | */ | |
568 | #define EXT4_DISCARD_PARTIAL_PG_ZERO_UNMAPPED 0x0001 | |
e6362609 | 569 | |
ac27a0ec DK |
570 | /* |
571 | * ioctl commands | |
572 | */ | |
617ba13b MC |
573 | #define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS |
574 | #define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS | |
575 | #define EXT4_IOC_GETVERSION _IOR('f', 3, long) | |
576 | #define EXT4_IOC_SETVERSION _IOW('f', 4, long) | |
617ba13b MC |
577 | #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION |
578 | #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION | |
617ba13b MC |
579 | #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long) |
580 | #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long) | |
8eea80d5 TT |
581 | #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long) |
582 | #define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input) | |
583 | #define EXT4_IOC_MIGRATE _IO('f', 9) | |
ccd2506b | 584 | /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */ |
8eea80d5 | 585 | /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */ |
ccd2506b | 586 | #define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12) |
748de673 | 587 | #define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent) |
19c5246d | 588 | #define EXT4_IOC_RESIZE_FS _IOW('f', 16, __u64) |
ac27a0ec | 589 | |
899ad0ce | 590 | #if defined(__KERNEL__) && defined(CONFIG_COMPAT) |
ac27a0ec DK |
591 | /* |
592 | * ioctl commands in 32 bit emulation | |
593 | */ | |
617ba13b MC |
594 | #define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS |
595 | #define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS | |
596 | #define EXT4_IOC32_GETVERSION _IOR('f', 3, int) | |
597 | #define EXT4_IOC32_SETVERSION _IOW('f', 4, int) | |
598 | #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int) | |
599 | #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int) | |
600 | #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int) | |
4d92dc0f | 601 | #define EXT4_IOC32_GROUP_ADD _IOW('f', 8, struct compat_ext4_new_group_input) |
617ba13b MC |
602 | #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION |
603 | #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION | |
899ad0ce | 604 | #endif |
ac27a0ec | 605 | |
b595076a | 606 | /* Max physical block we can address w/o extents */ |
fb0a387d ES |
607 | #define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF |
608 | ||
ac27a0ec DK |
609 | /* |
610 | * Structure of an inode on the disk | |
611 | */ | |
617ba13b | 612 | struct ext4_inode { |
ac27a0ec DK |
613 | __le16 i_mode; /* File mode */ |
614 | __le16 i_uid; /* Low 16 bits of Owner Uid */ | |
a48380f7 | 615 | __le32 i_size_lo; /* Size in bytes */ |
ac27a0ec | 616 | __le32 i_atime; /* Access time */ |
ef7f3835 | 617 | __le32 i_ctime; /* Inode Change time */ |
ac27a0ec DK |
618 | __le32 i_mtime; /* Modification time */ |
619 | __le32 i_dtime; /* Deletion Time */ | |
620 | __le16 i_gid; /* Low 16 bits of Group Id */ | |
621 | __le16 i_links_count; /* Links count */ | |
0fc1b451 | 622 | __le32 i_blocks_lo; /* Blocks count */ |
ac27a0ec DK |
623 | __le32 i_flags; /* File flags */ |
624 | union { | |
625 | struct { | |
25ec56b5 | 626 | __le32 l_i_version; |
ac27a0ec DK |
627 | } linux1; |
628 | struct { | |
629 | __u32 h_i_translator; | |
630 | } hurd1; | |
631 | struct { | |
632 | __u32 m_i_reserved1; | |
633 | } masix1; | |
634 | } osd1; /* OS dependent 1 */ | |
617ba13b | 635 | __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */ |
ac27a0ec | 636 | __le32 i_generation; /* File version (for NFS) */ |
7973c0c1 | 637 | __le32 i_file_acl_lo; /* File ACL */ |
a48380f7 | 638 | __le32 i_size_high; |
f077d0d7 | 639 | __le32 i_obso_faddr; /* Obsoleted fragment address */ |
ac27a0ec DK |
640 | union { |
641 | struct { | |
0fc1b451 | 642 | __le16 l_i_blocks_high; /* were l_i_reserved1 */ |
a1ddeb7e | 643 | __le16 l_i_file_acl_high; |
8c55e204 | 644 | __le16 l_i_uid_high; /* these 2 fields */ |
ac27a0ec DK |
645 | __le16 l_i_gid_high; /* were reserved2[0] */ |
646 | __u32 l_i_reserved2; | |
647 | } linux2; | |
648 | struct { | |
f077d0d7 | 649 | __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ |
ac27a0ec DK |
650 | __u16 h_i_mode_high; |
651 | __u16 h_i_uid_high; | |
652 | __u16 h_i_gid_high; | |
653 | __u32 h_i_author; | |
654 | } hurd2; | |
655 | struct { | |
f077d0d7 | 656 | __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ |
a1ddeb7e | 657 | __le16 m_i_file_acl_high; |
ac27a0ec DK |
658 | __u32 m_i_reserved2[2]; |
659 | } masix2; | |
660 | } osd2; /* OS dependent 2 */ | |
661 | __le16 i_extra_isize; | |
662 | __le16 i_pad1; | |
ef7f3835 KS |
663 | __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */ |
664 | __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */ | |
665 | __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */ | |
666 | __le32 i_crtime; /* File Creation time */ | |
667 | __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */ | |
25ec56b5 | 668 | __le32 i_version_hi; /* high 32 bits for 64-bit version */ |
ac27a0ec DK |
669 | }; |
670 | ||
748de673 AF |
671 | struct move_extent { |
672 | __u32 reserved; /* should be zero */ | |
673 | __u32 donor_fd; /* donor file descriptor */ | |
674 | __u64 orig_start; /* logical start offset in block for orig */ | |
675 | __u64 donor_start; /* logical start offset in block for donor */ | |
676 | __u64 len; /* block length to be moved */ | |
677 | __u64 moved_len; /* moved block length */ | |
678 | }; | |
ac27a0ec | 679 | |
ef7f3835 KS |
680 | #define EXT4_EPOCH_BITS 2 |
681 | #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1) | |
682 | #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS) | |
683 | ||
684 | /* | |
685 | * Extended fields will fit into an inode if the filesystem was formatted | |
686 | * with large inodes (-I 256 or larger) and there are not currently any EAs | |
687 | * consuming all of the available space. For new inodes we always reserve | |
688 | * enough space for the kernel's known extended fields, but for inodes | |
689 | * created with an old kernel this might not have been the case. None of | |
690 | * the extended inode fields is critical for correct filesystem operation. | |
691 | * This macro checks if a certain field fits in the inode. Note that | |
692 | * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize | |
693 | */ | |
694 | #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \ | |
695 | ((offsetof(typeof(*ext4_inode), field) + \ | |
696 | sizeof((ext4_inode)->field)) \ | |
697 | <= (EXT4_GOOD_OLD_INODE_SIZE + \ | |
698 | (einode)->i_extra_isize)) \ | |
699 | ||
700 | static inline __le32 ext4_encode_extra_time(struct timespec *time) | |
701 | { | |
702 | return cpu_to_le32((sizeof(time->tv_sec) > 4 ? | |
c1fccc06 TT |
703 | (time->tv_sec >> 32) & EXT4_EPOCH_MASK : 0) | |
704 | ((time->tv_nsec << EXT4_EPOCH_BITS) & EXT4_NSEC_MASK)); | |
ef7f3835 KS |
705 | } |
706 | ||
707 | static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra) | |
708 | { | |
709 | if (sizeof(time->tv_sec) > 4) | |
710 | time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) | |
711 | << 32; | |
c1fccc06 | 712 | time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS; |
ef7f3835 KS |
713 | } |
714 | ||
715 | #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \ | |
716 | do { \ | |
717 | (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \ | |
718 | if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \ | |
719 | (raw_inode)->xtime ## _extra = \ | |
720 | ext4_encode_extra_time(&(inode)->xtime); \ | |
721 | } while (0) | |
722 | ||
723 | #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \ | |
724 | do { \ | |
725 | if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ | |
726 | (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \ | |
727 | if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ | |
728 | (raw_inode)->xtime ## _extra = \ | |
729 | ext4_encode_extra_time(&(einode)->xtime); \ | |
730 | } while (0) | |
731 | ||
732 | #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \ | |
733 | do { \ | |
734 | (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \ | |
735 | if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \ | |
736 | ext4_decode_extra_time(&(inode)->xtime, \ | |
737 | raw_inode->xtime ## _extra); \ | |
af0b44a1 ES |
738 | else \ |
739 | (inode)->xtime.tv_nsec = 0; \ | |
ef7f3835 KS |
740 | } while (0) |
741 | ||
742 | #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \ | |
743 | do { \ | |
744 | if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ | |
745 | (einode)->xtime.tv_sec = \ | |
746 | (signed)le32_to_cpu((raw_inode)->xtime); \ | |
747 | if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ | |
748 | ext4_decode_extra_time(&(einode)->xtime, \ | |
749 | raw_inode->xtime ## _extra); \ | |
af0b44a1 ES |
750 | else \ |
751 | (einode)->xtime.tv_nsec = 0; \ | |
ef7f3835 KS |
752 | } while (0) |
753 | ||
25ec56b5 JNC |
754 | #define i_disk_version osd1.linux1.l_i_version |
755 | ||
ac27a0ec DK |
756 | #if defined(__KERNEL__) || defined(__linux__) |
757 | #define i_reserved1 osd1.linux1.l_i_reserved1 | |
a1ddeb7e | 758 | #define i_file_acl_high osd2.linux2.l_i_file_acl_high |
0fc1b451 | 759 | #define i_blocks_high osd2.linux2.l_i_blocks_high |
ac27a0ec DK |
760 | #define i_uid_low i_uid |
761 | #define i_gid_low i_gid | |
762 | #define i_uid_high osd2.linux2.l_i_uid_high | |
763 | #define i_gid_high osd2.linux2.l_i_gid_high | |
764 | #define i_reserved2 osd2.linux2.l_i_reserved2 | |
765 | ||
766 | #elif defined(__GNU__) | |
767 | ||
768 | #define i_translator osd1.hurd1.h_i_translator | |
ac27a0ec DK |
769 | #define i_uid_high osd2.hurd2.h_i_uid_high |
770 | #define i_gid_high osd2.hurd2.h_i_gid_high | |
771 | #define i_author osd2.hurd2.h_i_author | |
772 | ||
773 | #elif defined(__masix__) | |
774 | ||
775 | #define i_reserved1 osd1.masix1.m_i_reserved1 | |
a1ddeb7e | 776 | #define i_file_acl_high osd2.masix2.m_i_file_acl_high |
ac27a0ec DK |
777 | #define i_reserved2 osd2.masix2.m_i_reserved2 |
778 | ||
779 | #endif /* defined(__KERNEL__) || defined(__linux__) */ | |
780 | ||
d444c3c3 TT |
781 | /* |
782 | * storage for cached extent | |
b05e6ae5 TT |
783 | * If ec_len == 0, then the cache is invalid. |
784 | * If ec_start == 0, then the cache represents a gap (null mapping) | |
d444c3c3 TT |
785 | */ |
786 | struct ext4_ext_cache { | |
787 | ext4_fsblk_t ec_start; | |
788 | ext4_lblk_t ec_block; | |
789 | __u32 ec_len; /* must be 32bit to return holes */ | |
d444c3c3 TT |
790 | }; |
791 | ||
792 | /* | |
793 | * fourth extended file system inode data in memory | |
794 | */ | |
795 | struct ext4_inode_info { | |
796 | __le32 i_data[15]; /* unconverted */ | |
d444c3c3 | 797 | __u32 i_dtime; |
12e9b892 | 798 | ext4_fsblk_t i_file_acl; |
d444c3c3 TT |
799 | |
800 | /* | |
801 | * i_block_group is the number of the block group which contains | |
802 | * this file's inode. Constant across the lifetime of the inode, | |
803 | * it is ued for making block allocation decisions - we try to | |
804 | * place a file's data blocks near its inode block, and new inodes | |
805 | * near to their parent directory's inode. | |
806 | */ | |
807 | ext4_group_t i_block_group; | |
8a2005d3 | 808 | ext4_lblk_t i_dir_start_lookup; |
353eb83c | 809 | #if (BITS_PER_LONG < 64) |
19f5fb7a | 810 | unsigned long i_state_flags; /* Dynamic state flags */ |
353eb83c | 811 | #endif |
12e9b892 | 812 | unsigned long i_flags; |
d444c3c3 | 813 | |
d444c3c3 TT |
814 | #ifdef CONFIG_EXT4_FS_XATTR |
815 | /* | |
816 | * Extended attributes can be read independently of the main file | |
817 | * data. Taking i_mutex even when reading would cause contention | |
818 | * between readers of EAs and writers of regular file data, so | |
819 | * instead we synchronize on xattr_sem when reading or changing | |
820 | * EAs. | |
821 | */ | |
822 | struct rw_semaphore xattr_sem; | |
823 | #endif | |
d444c3c3 TT |
824 | |
825 | struct list_head i_orphan; /* unlinked but open inodes */ | |
826 | ||
827 | /* | |
828 | * i_disksize keeps track of what the inode size is ON DISK, not | |
829 | * in memory. During truncate, i_size is set to the new size by | |
830 | * the VFS prior to calling ext4_truncate(), but the filesystem won't | |
831 | * set i_disksize to 0 until the truncate is actually under way. | |
832 | * | |
833 | * The intent is that i_disksize always represents the blocks which | |
834 | * are used by this file. This allows recovery to restart truncate | |
835 | * on orphans if we crash during truncate. We actually write i_disksize | |
836 | * into the on-disk inode when writing inodes out, instead of i_size. | |
837 | * | |
838 | * The only time when i_disksize and i_size may be different is when | |
839 | * a truncate is in progress. The only things which change i_disksize | |
840 | * are ext4_get_block (growth) and ext4_truncate (shrinkth). | |
841 | */ | |
842 | loff_t i_disksize; | |
843 | ||
844 | /* | |
845 | * i_data_sem is for serialising ext4_truncate() against | |
846 | * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's | |
847 | * data tree are chopped off during truncate. We can't do that in | |
848 | * ext4 because whenever we perform intermediate commits during | |
849 | * truncate, the inode and all the metadata blocks *must* be in a | |
850 | * consistent state which allows truncation of the orphans to restart | |
851 | * during recovery. Hence we must fix the get_block-vs-truncate race | |
852 | * by other means, so we have i_data_sem. | |
853 | */ | |
854 | struct rw_semaphore i_data_sem; | |
855 | struct inode vfs_inode; | |
8aefcd55 | 856 | struct jbd2_inode *jinode; |
d444c3c3 TT |
857 | |
858 | struct ext4_ext_cache i_cached_extent; | |
859 | /* | |
860 | * File creation time. Its function is same as that of | |
861 | * struct timespec i_{a,c,m}time in the generic inode. | |
862 | */ | |
863 | struct timespec i_crtime; | |
864 | ||
865 | /* mballoc */ | |
866 | struct list_head i_prealloc_list; | |
867 | spinlock_t i_prealloc_lock; | |
868 | ||
869 | /* ialloc */ | |
870 | ext4_group_t i_last_alloc_group; | |
871 | ||
872 | /* allocation reservation info for delalloc */ | |
57042651 | 873 | /* In case of bigalloc, these refer to clusters rather than blocks */ |
d444c3c3 TT |
874 | unsigned int i_reserved_data_blocks; |
875 | unsigned int i_reserved_meta_blocks; | |
876 | unsigned int i_allocated_meta_blocks; | |
01f49d0b | 877 | ext4_lblk_t i_da_metadata_calc_last_lblock; |
9d0be502 | 878 | int i_da_metadata_calc_len; |
d444c3c3 TT |
879 | |
880 | /* on-disk additional length */ | |
881 | __u16 i_extra_isize; | |
882 | ||
a9e7f447 DM |
883 | #ifdef CONFIG_QUOTA |
884 | /* quota space reservation, managed internally by quota code */ | |
885 | qsize_t i_reserved_quota; | |
886 | #endif | |
8d5d02e6 | 887 | |
c7064ef1 JZ |
888 | /* completed IOs that might need unwritten extents handling */ |
889 | struct list_head i_completed_io_list; | |
744692dc | 890 | spinlock_t i_completed_io_lock; |
8a2005d3 | 891 | atomic_t i_ioend_count; /* Number of outstanding io_end structs */ |
8d5d02e6 MC |
892 | /* current io_end structure for async DIO write*/ |
893 | ext4_io_end_t *cur_aio_dio; | |
e9e3bcec | 894 | atomic_t i_aiodio_unwritten; /* Nr. of inflight conversions pending */ |
8a2005d3 TT |
895 | |
896 | spinlock_t i_block_reservation_lock; | |
b436b9be JK |
897 | |
898 | /* | |
899 | * Transactions that contain inode's metadata needed to complete | |
900 | * fsync and fdatasync, respectively. | |
901 | */ | |
902 | tid_t i_sync_tid; | |
903 | tid_t i_datasync_tid; | |
d444c3c3 TT |
904 | }; |
905 | ||
ac27a0ec DK |
906 | /* |
907 | * File system states | |
908 | */ | |
617ba13b MC |
909 | #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */ |
910 | #define EXT4_ERROR_FS 0x0002 /* Errors detected */ | |
911 | #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */ | |
ac27a0ec | 912 | |
469108ff TT |
913 | /* |
914 | * Misc. filesystem flags | |
915 | */ | |
916 | #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */ | |
917 | #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */ | |
918 | #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */ | |
919 | ||
ac27a0ec DK |
920 | /* |
921 | * Mount flags | |
922 | */ | |
617ba13b MC |
923 | #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */ |
924 | #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */ | |
925 | #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */ | |
926 | #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */ | |
927 | #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */ | |
39ef17f1 | 928 | #define EXT4_MOUNT_ERRORS_MASK 0x00070 |
617ba13b MC |
929 | #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */ |
930 | #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/ | |
617ba13b MC |
931 | #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */ |
932 | #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */ | |
933 | #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */ | |
934 | #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */ | |
935 | #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */ | |
936 | #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */ | |
937 | #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */ | |
938 | #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */ | |
afd4672d | 939 | #define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */ |
617ba13b | 940 | #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */ |
617ba13b MC |
941 | #define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */ |
942 | #define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */ | |
943 | #define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */ | |
744692dc | 944 | #define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000 /* Enable support for dio read nolocking */ |
d4da6c9c | 945 | #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */ |
818d276c | 946 | #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */ |
1449032b | 947 | #define EXT4_MOUNT_MBLK_IO_SUBMIT 0x4000000 /* multi-block io submits */ |
64769240 | 948 | #define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */ |
5bf5683a | 949 | #define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */ |
6fd058f7 | 950 | #define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */ |
5328e635 | 951 | #define EXT4_MOUNT_DISCARD 0x40000000 /* Issue DISCARD requests */ |
bfff6873 | 952 | #define EXT4_MOUNT_INIT_INODE_TABLE 0x80000000 /* Initialize uninitialized itables */ |
5bf5683a | 953 | |
56889787 TT |
954 | #define EXT4_MOUNT2_EXPLICIT_DELALLOC 0x00000001 /* User explicitly |
955 | specified delalloc */ | |
956 | ||
fd8c37ec TT |
957 | #define clear_opt(sb, opt) EXT4_SB(sb)->s_mount_opt &= \ |
958 | ~EXT4_MOUNT_##opt | |
959 | #define set_opt(sb, opt) EXT4_SB(sb)->s_mount_opt |= \ | |
960 | EXT4_MOUNT_##opt | |
617ba13b MC |
961 | #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \ |
962 | EXT4_MOUNT_##opt) | |
ac27a0ec | 963 | |
a2595b8a TT |
964 | #define clear_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 &= \ |
965 | ~EXT4_MOUNT2_##opt | |
966 | #define set_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 |= \ | |
967 | EXT4_MOUNT2_##opt | |
968 | #define test_opt2(sb, opt) (EXT4_SB(sb)->s_mount_opt2 & \ | |
969 | EXT4_MOUNT2_##opt) | |
970 | ||
597d508c AM |
971 | #define ext4_test_and_set_bit __test_and_set_bit_le |
972 | #define ext4_set_bit __set_bit_le | |
617ba13b | 973 | #define ext4_set_bit_atomic ext2_set_bit_atomic |
597d508c AM |
974 | #define ext4_test_and_clear_bit __test_and_clear_bit_le |
975 | #define ext4_clear_bit __clear_bit_le | |
617ba13b | 976 | #define ext4_clear_bit_atomic ext2_clear_bit_atomic |
50e0168c | 977 | #define ext4_test_bit test_bit_le |
50e0168c AM |
978 | #define ext4_find_next_zero_bit find_next_zero_bit_le |
979 | #define ext4_find_next_bit find_next_bit_le | |
ac27a0ec | 980 | |
c3e94d1d YY |
981 | extern void ext4_set_bits(void *bm, int cur, int len); |
982 | ||
ac27a0ec DK |
983 | /* |
984 | * Maximal mount counts between two filesystem checks | |
985 | */ | |
617ba13b MC |
986 | #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ |
987 | #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */ | |
ac27a0ec DK |
988 | |
989 | /* | |
990 | * Behaviour when detecting errors | |
991 | */ | |
617ba13b MC |
992 | #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */ |
993 | #define EXT4_ERRORS_RO 2 /* Remount fs read-only */ | |
994 | #define EXT4_ERRORS_PANIC 3 /* Panic */ | |
995 | #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE | |
ac27a0ec DK |
996 | |
997 | /* | |
998 | * Structure of the super block | |
999 | */ | |
617ba13b | 1000 | struct ext4_super_block { |
ac27a0ec | 1001 | /*00*/ __le32 s_inodes_count; /* Inodes count */ |
6bc9feff | 1002 | __le32 s_blocks_count_lo; /* Blocks count */ |
308ba3ec AK |
1003 | __le32 s_r_blocks_count_lo; /* Reserved blocks count */ |
1004 | __le32 s_free_blocks_count_lo; /* Free blocks count */ | |
ac27a0ec DK |
1005 | /*10*/ __le32 s_free_inodes_count; /* Free inodes count */ |
1006 | __le32 s_first_data_block; /* First Data Block */ | |
1007 | __le32 s_log_block_size; /* Block size */ | |
281b5995 | 1008 | __le32 s_log_cluster_size; /* Allocation cluster size */ |
ac27a0ec | 1009 | /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */ |
281b5995 | 1010 | __le32 s_clusters_per_group; /* # Clusters per group */ |
ac27a0ec DK |
1011 | __le32 s_inodes_per_group; /* # Inodes per group */ |
1012 | __le32 s_mtime; /* Mount time */ | |
1013 | /*30*/ __le32 s_wtime; /* Write time */ | |
1014 | __le16 s_mnt_count; /* Mount count */ | |
1015 | __le16 s_max_mnt_count; /* Maximal mount count */ | |
1016 | __le16 s_magic; /* Magic signature */ | |
1017 | __le16 s_state; /* File system state */ | |
1018 | __le16 s_errors; /* Behaviour when detecting errors */ | |
1019 | __le16 s_minor_rev_level; /* minor revision level */ | |
1020 | /*40*/ __le32 s_lastcheck; /* time of last check */ | |
1021 | __le32 s_checkinterval; /* max. time between checks */ | |
1022 | __le32 s_creator_os; /* OS */ | |
1023 | __le32 s_rev_level; /* Revision level */ | |
1024 | /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */ | |
1025 | __le16 s_def_resgid; /* Default gid for reserved blocks */ | |
1026 | /* | |
617ba13b | 1027 | * These fields are for EXT4_DYNAMIC_REV superblocks only. |
ac27a0ec DK |
1028 | * |
1029 | * Note: the difference between the compatible feature set and | |
1030 | * the incompatible feature set is that if there is a bit set | |
1031 | * in the incompatible feature set that the kernel doesn't | |
1032 | * know about, it should refuse to mount the filesystem. | |
1033 | * | |
1034 | * e2fsck's requirements are more strict; if it doesn't know | |
1035 | * about a feature in either the compatible or incompatible | |
1036 | * feature set, it must abort and not try to meddle with | |
1037 | * things it doesn't understand... | |
1038 | */ | |
1039 | __le32 s_first_ino; /* First non-reserved inode */ | |
0d1ee42f | 1040 | __le16 s_inode_size; /* size of inode structure */ |
ac27a0ec DK |
1041 | __le16 s_block_group_nr; /* block group # of this superblock */ |
1042 | __le32 s_feature_compat; /* compatible feature set */ | |
1043 | /*60*/ __le32 s_feature_incompat; /* incompatible feature set */ | |
1044 | __le32 s_feature_ro_compat; /* readonly-compatible feature set */ | |
1045 | /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */ | |
1046 | /*78*/ char s_volume_name[16]; /* volume name */ | |
1047 | /*88*/ char s_last_mounted[64]; /* directory where last mounted */ | |
1048 | /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */ | |
1049 | /* | |
1050 | * Performance hints. Directory preallocation should only | |
617ba13b | 1051 | * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on. |
ac27a0ec DK |
1052 | */ |
1053 | __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ | |
1054 | __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ | |
1055 | __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */ | |
1056 | /* | |
617ba13b | 1057 | * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set. |
ac27a0ec DK |
1058 | */ |
1059 | /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */ | |
1060 | /*E0*/ __le32 s_journal_inum; /* inode number of journal file */ | |
1061 | __le32 s_journal_dev; /* device number of journal file */ | |
1062 | __le32 s_last_orphan; /* start of list of inodes to delete */ | |
1063 | __le32 s_hash_seed[4]; /* HTREE hash seed */ | |
1064 | __u8 s_def_hash_version; /* Default hash version to use */ | |
89eeddf0 | 1065 | __u8 s_jnl_backup_type; |
0d1ee42f | 1066 | __le16 s_desc_size; /* size of group descriptor */ |
bd81d8ee | 1067 | /*100*/ __le32 s_default_mount_opts; |
ac27a0ec | 1068 | __le32 s_first_meta_bg; /* First metablock block group */ |
bd81d8ee LV |
1069 | __le32 s_mkfs_time; /* When the filesystem was created */ |
1070 | __le32 s_jnl_blocks[17]; /* Backup of the journal inode */ | |
1071 | /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */ | |
1072 | /*150*/ __le32 s_blocks_count_hi; /* Blocks count */ | |
1073 | __le32 s_r_blocks_count_hi; /* Reserved blocks count */ | |
1074 | __le32 s_free_blocks_count_hi; /* Free blocks count */ | |
c1bddad9 AK |
1075 | __le16 s_min_extra_isize; /* All inodes have at least # bytes */ |
1076 | __le16 s_want_extra_isize; /* New inodes should reserve # bytes */ | |
1077 | __le32 s_flags; /* Miscellaneous flags */ | |
1078 | __le16 s_raid_stride; /* RAID stride */ | |
c5e06d10 | 1079 | __le16 s_mmp_update_interval; /* # seconds to wait in MMP checking */ |
c1bddad9 AK |
1080 | __le64 s_mmp_block; /* Block for multi-mount protection */ |
1081 | __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/ | |
772cb7c8 | 1082 | __u8 s_log_groups_per_flex; /* FLEX_BG group size */ |
89eeddf0 | 1083 | __u8 s_reserved_char_pad; |
772cb7c8 | 1084 | __le16 s_reserved_pad; |
afc32f7e | 1085 | __le64 s_kbytes_written; /* nr of lifetime kilobytes written */ |
4a9cdec7 TT |
1086 | __le32 s_snapshot_inum; /* Inode number of active snapshot */ |
1087 | __le32 s_snapshot_id; /* sequential ID of active snapshot */ | |
1088 | __le64 s_snapshot_r_blocks_count; /* reserved blocks for active | |
1089 | snapshot's future use */ | |
1090 | __le32 s_snapshot_list; /* inode number of the head of the | |
1091 | on-disk snapshot list */ | |
1c13d5c0 TT |
1092 | #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count) |
1093 | __le32 s_error_count; /* number of fs errors */ | |
1094 | __le32 s_first_error_time; /* first time an error happened */ | |
1095 | __le32 s_first_error_ino; /* inode involved in first error */ | |
1096 | __le64 s_first_error_block; /* block involved of first error */ | |
1097 | __u8 s_first_error_func[32]; /* function where the error happened */ | |
1098 | __le32 s_first_error_line; /* line number where error happened */ | |
1099 | __le32 s_last_error_time; /* most recent time of an error */ | |
1100 | __le32 s_last_error_ino; /* inode involved in last error */ | |
1101 | __le32 s_last_error_line; /* line number where error happened */ | |
1102 | __le64 s_last_error_block; /* block involved of last error */ | |
1103 | __u8 s_last_error_func[32]; /* function where the error happened */ | |
8b67f04a TT |
1104 | #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts) |
1105 | __u8 s_mount_opts[64]; | |
281b5995 TT |
1106 | __le32 s_usr_quota_inum; /* inode for tracking user quota */ |
1107 | __le32 s_grp_quota_inum; /* inode for tracking group quota */ | |
1108 | __le32 s_overhead_clusters; /* overhead blocks/clusters in fs */ | |
1109 | __le32 s_reserved[109]; /* Padding to the end of the block */ | |
ac27a0ec DK |
1110 | }; |
1111 | ||
1c13d5c0 TT |
1112 | #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START) |
1113 | ||
ac27a0ec | 1114 | #ifdef __KERNEL__ |
bc0b0d6d TT |
1115 | |
1116 | /* | |
4ab2f15b | 1117 | * run-time mount flags |
bc0b0d6d TT |
1118 | */ |
1119 | #define EXT4_MF_MNTDIR_SAMPLED 0x0001 | |
4ab2f15b | 1120 | #define EXT4_MF_FS_ABORTED 0x0002 /* Fatal error detected */ |
bc0b0d6d | 1121 | |
ca0faba0 TT |
1122 | /* |
1123 | * fourth extended-fs super-block data in memory | |
1124 | */ | |
1125 | struct ext4_sb_info { | |
1126 | unsigned long s_desc_size; /* Size of a group descriptor in bytes */ | |
1127 | unsigned long s_inodes_per_block;/* Number of inodes per block */ | |
1128 | unsigned long s_blocks_per_group;/* Number of blocks in a group */ | |
281b5995 | 1129 | unsigned long s_clusters_per_group; /* Number of clusters in a group */ |
ca0faba0 TT |
1130 | unsigned long s_inodes_per_group;/* Number of inodes in a group */ |
1131 | unsigned long s_itb_per_group; /* Number of inode table blocks per group */ | |
1132 | unsigned long s_gdb_count; /* Number of group descriptor blocks */ | |
1133 | unsigned long s_desc_per_block; /* Number of group descriptors per block */ | |
1134 | ext4_group_t s_groups_count; /* Number of groups in the fs */ | |
fb0a387d | 1135 | ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */ |
ca0faba0 TT |
1136 | unsigned long s_overhead_last; /* Last calculated overhead */ |
1137 | unsigned long s_blocks_last; /* Last seen block count */ | |
281b5995 TT |
1138 | unsigned int s_cluster_ratio; /* Number of blocks per cluster */ |
1139 | unsigned int s_cluster_bits; /* log2 of s_cluster_ratio */ | |
ca0faba0 TT |
1140 | loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */ |
1141 | struct buffer_head * s_sbh; /* Buffer containing the super block */ | |
1142 | struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */ | |
1143 | struct buffer_head **s_group_desc; | |
7f4520cc | 1144 | unsigned int s_mount_opt; |
a2595b8a | 1145 | unsigned int s_mount_opt2; |
bc0b0d6d | 1146 | unsigned int s_mount_flags; |
5a916be1 | 1147 | unsigned int s_def_mount_opt; |
ca0faba0 TT |
1148 | ext4_fsblk_t s_sb_block; |
1149 | uid_t s_resuid; | |
1150 | gid_t s_resgid; | |
1151 | unsigned short s_mount_state; | |
1152 | unsigned short s_pad; | |
1153 | int s_addr_per_block_bits; | |
1154 | int s_desc_per_block_bits; | |
1155 | int s_inode_size; | |
1156 | int s_first_ino; | |
1157 | unsigned int s_inode_readahead_blks; | |
11013911 | 1158 | unsigned int s_inode_goal; |
ca0faba0 TT |
1159 | spinlock_t s_next_gen_lock; |
1160 | u32 s_next_generation; | |
1161 | u32 s_hash_seed[4]; | |
1162 | int s_def_hash_version; | |
1163 | int s_hash_unsigned; /* 3 if hash should be signed, 0 if not */ | |
57042651 | 1164 | struct percpu_counter s_freeclusters_counter; |
ca0faba0 TT |
1165 | struct percpu_counter s_freeinodes_counter; |
1166 | struct percpu_counter s_dirs_counter; | |
57042651 | 1167 | struct percpu_counter s_dirtyclusters_counter; |
ca0faba0 TT |
1168 | struct blockgroup_lock *s_blockgroup_lock; |
1169 | struct proc_dir_entry *s_proc; | |
1170 | struct kobject s_kobj; | |
1171 | struct completion s_kobj_unregister; | |
1172 | ||
1173 | /* Journaling */ | |
ca0faba0 TT |
1174 | struct journal_s *s_journal; |
1175 | struct list_head s_orphan; | |
1176 | struct mutex s_orphan_lock; | |
8f82f840 YY |
1177 | unsigned long s_resize_flags; /* Flags indicating if there |
1178 | is a resizer */ | |
ca0faba0 TT |
1179 | unsigned long s_commit_interval; |
1180 | u32 s_max_batch_time; | |
1181 | u32 s_min_batch_time; | |
1182 | struct block_device *journal_bdev; | |
ca0faba0 TT |
1183 | #ifdef CONFIG_QUOTA |
1184 | char *s_qf_names[MAXQUOTAS]; /* Names of quota files with journalled quota */ | |
1185 | int s_jquota_fmt; /* Format of quota to use */ | |
1186 | #endif | |
1187 | unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */ | |
6fd058f7 | 1188 | struct rb_root system_blks; |
ca0faba0 TT |
1189 | |
1190 | #ifdef EXTENTS_STATS | |
1191 | /* ext4 extents stats */ | |
1192 | unsigned long s_ext_min; | |
1193 | unsigned long s_ext_max; | |
1194 | unsigned long s_depth_max; | |
1195 | spinlock_t s_ext_stats_lock; | |
1196 | unsigned long s_ext_blocks; | |
1197 | unsigned long s_ext_extents; | |
1198 | #endif | |
77f4135f VH |
1199 | /* ext4 extent cache stats */ |
1200 | unsigned long extent_cache_hits; | |
1201 | unsigned long extent_cache_misses; | |
ca0faba0 TT |
1202 | |
1203 | /* for buddy allocator */ | |
1204 | struct ext4_group_info ***s_group_info; | |
1205 | struct inode *s_buddy_cache; | |
ca0faba0 | 1206 | spinlock_t s_md_lock; |
ca0faba0 TT |
1207 | unsigned short *s_mb_offsets; |
1208 | unsigned int *s_mb_maxs; | |
1209 | ||
1210 | /* tunables */ | |
1211 | unsigned long s_stripe; | |
1212 | unsigned int s_mb_stream_request; | |
1213 | unsigned int s_mb_max_to_scan; | |
1214 | unsigned int s_mb_min_to_scan; | |
1215 | unsigned int s_mb_stats; | |
1216 | unsigned int s_mb_order2_reqs; | |
1217 | unsigned int s_mb_group_prealloc; | |
55138e0b | 1218 | unsigned int s_max_writeback_mb_bump; |
ca0faba0 TT |
1219 | /* where last allocation was done - for stream allocation */ |
1220 | unsigned long s_mb_last_group; | |
1221 | unsigned long s_mb_last_start; | |
1222 | ||
ca0faba0 | 1223 | /* stats for buddy allocator */ |
ca0faba0 TT |
1224 | atomic_t s_bal_reqs; /* number of reqs with len > 1 */ |
1225 | atomic_t s_bal_success; /* we found long enough chunks */ | |
1226 | atomic_t s_bal_allocated; /* in blocks */ | |
1227 | atomic_t s_bal_ex_scanned; /* total extents scanned */ | |
1228 | atomic_t s_bal_goals; /* goal hits */ | |
1229 | atomic_t s_bal_breaks; /* too long searches */ | |
1230 | atomic_t s_bal_2orders; /* 2^order hits */ | |
1231 | spinlock_t s_bal_lock; | |
1232 | unsigned long s_mb_buddies_generated; | |
1233 | unsigned long long s_mb_generation_time; | |
1234 | atomic_t s_mb_lost_chunks; | |
1235 | atomic_t s_mb_preallocated; | |
1236 | atomic_t s_mb_discarded; | |
50797481 | 1237 | atomic_t s_lock_busy; |
ca0faba0 TT |
1238 | |
1239 | /* locality groups */ | |
003cb608 | 1240 | struct ext4_locality_group __percpu *s_locality_groups; |
ca0faba0 TT |
1241 | |
1242 | /* for write statistics */ | |
1243 | unsigned long s_sectors_written_start; | |
1244 | u64 s_kbytes_written; | |
1245 | ||
1246 | unsigned int s_log_groups_per_flex; | |
1247 | struct flex_groups *s_flex_groups; | |
4c0425ff MC |
1248 | |
1249 | /* workqueue for dio unwritten */ | |
1250 | struct workqueue_struct *dio_unwritten_wq; | |
66e61a9e TT |
1251 | |
1252 | /* timer for periodic error stats printing */ | |
1253 | struct timer_list s_err_report; | |
bfff6873 LC |
1254 | |
1255 | /* Lazy inode table initialization info */ | |
1256 | struct ext4_li_request *s_li_request; | |
1257 | /* Wait multiplier for lazy initialization thread */ | |
1258 | unsigned int s_li_wait_mult; | |
c5e06d10 JL |
1259 | |
1260 | /* Kernel thread for multiple mount protection */ | |
1261 | struct task_struct *s_mmp_tsk; | |
3d56b8d2 TM |
1262 | |
1263 | /* record the last minlen when FITRIM is called. */ | |
1264 | atomic_t s_last_trim_minblks; | |
ca0faba0 TT |
1265 | }; |
1266 | ||
af5bc92d | 1267 | static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb) |
ac27a0ec DK |
1268 | { |
1269 | return sb->s_fs_info; | |
1270 | } | |
617ba13b | 1271 | static inline struct ext4_inode_info *EXT4_I(struct inode *inode) |
ac27a0ec | 1272 | { |
617ba13b | 1273 | return container_of(inode, struct ext4_inode_info, vfs_inode); |
ac27a0ec DK |
1274 | } |
1275 | ||
ef7f3835 KS |
1276 | static inline struct timespec ext4_current_time(struct inode *inode) |
1277 | { | |
1278 | return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ? | |
1279 | current_fs_time(inode->i_sb) : CURRENT_TIME_SEC; | |
1280 | } | |
1281 | ||
617ba13b | 1282 | static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino) |
ac27a0ec | 1283 | { |
617ba13b MC |
1284 | return ino == EXT4_ROOT_INO || |
1285 | ino == EXT4_JOURNAL_INO || | |
1286 | ino == EXT4_RESIZE_INO || | |
1287 | (ino >= EXT4_FIRST_INO(sb) && | |
1288 | ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count)); | |
ac27a0ec | 1289 | } |
19f5fb7a | 1290 | |
0edeb71d TM |
1291 | static inline void ext4_set_io_unwritten_flag(struct inode *inode, |
1292 | struct ext4_io_end *io_end) | |
1293 | { | |
1294 | if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) { | |
1295 | io_end->flag |= EXT4_IO_END_UNWRITTEN; | |
1296 | atomic_inc(&EXT4_I(inode)->i_aiodio_unwritten); | |
1297 | } | |
1298 | } | |
1299 | ||
19f5fb7a TT |
1300 | /* |
1301 | * Inode dynamic state flags | |
1302 | */ | |
1303 | enum { | |
1304 | EXT4_STATE_JDATA, /* journaled data exists */ | |
1305 | EXT4_STATE_NEW, /* inode is newly created */ | |
1306 | EXT4_STATE_XATTR, /* has in-inode xattrs */ | |
1307 | EXT4_STATE_NO_EXPAND, /* No space for expansion */ | |
1308 | EXT4_STATE_DA_ALLOC_CLOSE, /* Alloc DA blks on close */ | |
1309 | EXT4_STATE_EXT_MIGRATE, /* Inode is migrating */ | |
1310 | EXT4_STATE_DIO_UNWRITTEN, /* need convert on dio done*/ | |
14ece102 | 1311 | EXT4_STATE_NEWENTRY, /* File just added to dir */ |
f2321097 | 1312 | EXT4_STATE_DELALLOC_RESERVED, /* blks already reserved for delalloc */ |
19f5fb7a TT |
1313 | }; |
1314 | ||
353eb83c | 1315 | #define EXT4_INODE_BIT_FNS(name, field, offset) \ |
12e9b892 DM |
1316 | static inline int ext4_test_inode_##name(struct inode *inode, int bit) \ |
1317 | { \ | |
353eb83c | 1318 | return test_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ |
12e9b892 DM |
1319 | } \ |
1320 | static inline void ext4_set_inode_##name(struct inode *inode, int bit) \ | |
1321 | { \ | |
353eb83c | 1322 | set_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ |
12e9b892 DM |
1323 | } \ |
1324 | static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \ | |
1325 | { \ | |
353eb83c | 1326 | clear_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ |
19f5fb7a TT |
1327 | } |
1328 | ||
353eb83c TT |
1329 | EXT4_INODE_BIT_FNS(flag, flags, 0) |
1330 | #if (BITS_PER_LONG < 64) | |
1331 | EXT4_INODE_BIT_FNS(state, state_flags, 0) | |
1332 | ||
1333 | static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) | |
1334 | { | |
1335 | (ei)->i_state_flags = 0; | |
1336 | } | |
1337 | #else | |
1338 | EXT4_INODE_BIT_FNS(state, flags, 32) | |
1339 | ||
1340 | static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) | |
1341 | { | |
1342 | /* We depend on the fact that callers will set i_flags */ | |
1343 | } | |
1344 | #endif | |
ac27a0ec | 1345 | #else |
617ba13b | 1346 | /* Assume that user mode programs are passing in an ext4fs superblock, not |
ac27a0ec DK |
1347 | * a kernel struct super_block. This will allow us to call the feature-test |
1348 | * macros from user land. */ | |
617ba13b | 1349 | #define EXT4_SB(sb) (sb) |
ac27a0ec DK |
1350 | #endif |
1351 | ||
617ba13b | 1352 | #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime |
ac27a0ec DK |
1353 | |
1354 | /* | |
1355 | * Codes for operating systems | |
1356 | */ | |
617ba13b MC |
1357 | #define EXT4_OS_LINUX 0 |
1358 | #define EXT4_OS_HURD 1 | |
1359 | #define EXT4_OS_MASIX 2 | |
1360 | #define EXT4_OS_FREEBSD 3 | |
1361 | #define EXT4_OS_LITES 4 | |
ac27a0ec DK |
1362 | |
1363 | /* | |
1364 | * Revision levels | |
1365 | */ | |
617ba13b MC |
1366 | #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */ |
1367 | #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ | |
ac27a0ec | 1368 | |
617ba13b MC |
1369 | #define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV |
1370 | #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV | |
ac27a0ec | 1371 | |
617ba13b | 1372 | #define EXT4_GOOD_OLD_INODE_SIZE 128 |
ac27a0ec DK |
1373 | |
1374 | /* | |
1375 | * Feature set definitions | |
1376 | */ | |
1377 | ||
617ba13b | 1378 | #define EXT4_HAS_COMPAT_FEATURE(sb,mask) \ |
3a06d778 | 1379 | ((EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask)) != 0) |
617ba13b | 1380 | #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \ |
3a06d778 | 1381 | ((EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask)) != 0) |
617ba13b | 1382 | #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \ |
3a06d778 | 1383 | ((EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask)) != 0) |
617ba13b MC |
1384 | #define EXT4_SET_COMPAT_FEATURE(sb,mask) \ |
1385 | EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask) | |
1386 | #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \ | |
1387 | EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask) | |
1388 | #define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \ | |
1389 | EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask) | |
1390 | #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \ | |
1391 | EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask) | |
1392 | #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \ | |
1393 | EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask) | |
1394 | #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \ | |
1395 | EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask) | |
1396 | ||
1397 | #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001 | |
1398 | #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002 | |
1399 | #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004 | |
1400 | #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008 | |
1401 | #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010 | |
1402 | #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020 | |
1403 | ||
1404 | #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 | |
1405 | #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 | |
1406 | #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 | |
0fc1b451 | 1407 | #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008 |
717d50e4 | 1408 | #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010 |
f8628a14 | 1409 | #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020 |
ef7f3835 | 1410 | #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040 |
ae812306 | 1411 | #define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100 |
281b5995 | 1412 | #define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200 |
9b90e5e0 | 1413 | #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400 |
617ba13b MC |
1414 | |
1415 | #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001 | |
1416 | #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002 | |
1417 | #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */ | |
1418 | #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */ | |
1419 | #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010 | |
a86c6181 | 1420 | #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */ |
bd81d8ee | 1421 | #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080 |
0fc1b451 | 1422 | #define EXT4_FEATURE_INCOMPAT_MMP 0x0100 |
ce421581 | 1423 | #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200 |
f710b4b9 TT |
1424 | #define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 /* EA in inode */ |
1425 | #define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 /* data in dirent */ | |
856cbcf9 | 1426 | #define EXT4_FEATURE_INCOMPAT_BG_USE_META_CSUM 0x2000 /* use crc32c for bg */ |
9b90e5e0 | 1427 | #define EXT4_FEATURE_INCOMPAT_LARGEDIR 0x4000 /* >2GB or 3-lvl htree */ |
856cbcf9 | 1428 | #define EXT4_FEATURE_INCOMPAT_INLINEDATA 0x8000 /* data in inode */ |
617ba13b | 1429 | |
2035e776 TT |
1430 | #define EXT2_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR |
1431 | #define EXT2_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ | |
1432 | EXT4_FEATURE_INCOMPAT_META_BG) | |
1433 | #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ | |
1434 | EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ | |
1435 | EXT4_FEATURE_RO_COMPAT_BTREE_DIR) | |
1436 | ||
1437 | #define EXT3_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR | |
1438 | #define EXT3_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ | |
1439 | EXT4_FEATURE_INCOMPAT_RECOVER| \ | |
1440 | EXT4_FEATURE_INCOMPAT_META_BG) | |
1441 | #define EXT3_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ | |
1442 | EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ | |
1443 | EXT4_FEATURE_RO_COMPAT_BTREE_DIR) | |
1444 | ||
617ba13b MC |
1445 | #define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR |
1446 | #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ | |
1447 | EXT4_FEATURE_INCOMPAT_RECOVER| \ | |
a86c6181 | 1448 | EXT4_FEATURE_INCOMPAT_META_BG| \ |
bd81d8ee | 1449 | EXT4_FEATURE_INCOMPAT_EXTENTS| \ |
ce421581 | 1450 | EXT4_FEATURE_INCOMPAT_64BIT| \ |
c5e06d10 JL |
1451 | EXT4_FEATURE_INCOMPAT_FLEX_BG| \ |
1452 | EXT4_FEATURE_INCOMPAT_MMP) | |
617ba13b MC |
1453 | #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ |
1454 | EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ | |
717d50e4 | 1455 | EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \ |
f8628a14 | 1456 | EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \ |
ef7f3835 | 1457 | EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \ |
0fc1b451 | 1458 | EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\ |
6f16b606 TT |
1459 | EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\ |
1460 | EXT4_FEATURE_RO_COMPAT_BIGALLOC) | |
ac27a0ec DK |
1461 | |
1462 | /* | |
1463 | * Default values for user and/or group using reserved blocks | |
1464 | */ | |
617ba13b MC |
1465 | #define EXT4_DEF_RESUID 0 |
1466 | #define EXT4_DEF_RESGID 0 | |
ac27a0ec | 1467 | |
240799cd TT |
1468 | #define EXT4_DEF_INODE_READAHEAD_BLKS 32 |
1469 | ||
ac27a0ec DK |
1470 | /* |
1471 | * Default mount options | |
1472 | */ | |
617ba13b MC |
1473 | #define EXT4_DEFM_DEBUG 0x0001 |
1474 | #define EXT4_DEFM_BSDGROUPS 0x0002 | |
1475 | #define EXT4_DEFM_XATTR_USER 0x0004 | |
1476 | #define EXT4_DEFM_ACL 0x0008 | |
1477 | #define EXT4_DEFM_UID16 0x0010 | |
1478 | #define EXT4_DEFM_JMODE 0x0060 | |
1479 | #define EXT4_DEFM_JMODE_DATA 0x0020 | |
1480 | #define EXT4_DEFM_JMODE_ORDERED 0x0040 | |
1481 | #define EXT4_DEFM_JMODE_WBACK 0x0060 | |
8b67f04a TT |
1482 | #define EXT4_DEFM_NOBARRIER 0x0100 |
1483 | #define EXT4_DEFM_BLOCK_VALIDITY 0x0200 | |
1484 | #define EXT4_DEFM_DISCARD 0x0400 | |
1485 | #define EXT4_DEFM_NODELALLOC 0x0800 | |
ac27a0ec | 1486 | |
30773840 TT |
1487 | /* |
1488 | * Default journal batch times | |
1489 | */ | |
1490 | #define EXT4_DEF_MIN_BATCH_TIME 0 | |
1491 | #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */ | |
1492 | ||
a4912123 TT |
1493 | /* |
1494 | * Minimum number of groups in a flexgroup before we separate out | |
1495 | * directories into the first block group of a flexgroup | |
1496 | */ | |
1497 | #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4 | |
1498 | ||
ac27a0ec DK |
1499 | /* |
1500 | * Structure of a directory entry | |
1501 | */ | |
617ba13b | 1502 | #define EXT4_NAME_LEN 255 |
ac27a0ec | 1503 | |
617ba13b | 1504 | struct ext4_dir_entry { |
ac27a0ec DK |
1505 | __le32 inode; /* Inode number */ |
1506 | __le16 rec_len; /* Directory entry length */ | |
1507 | __le16 name_len; /* Name length */ | |
617ba13b | 1508 | char name[EXT4_NAME_LEN]; /* File name */ |
ac27a0ec DK |
1509 | }; |
1510 | ||
1511 | /* | |
617ba13b | 1512 | * The new version of the directory entry. Since EXT4 structures are |
ac27a0ec DK |
1513 | * stored in intel byte order, and the name_len field could never be |
1514 | * bigger than 255 chars, it's safe to reclaim the extra byte for the | |
1515 | * file_type field. | |
1516 | */ | |
617ba13b | 1517 | struct ext4_dir_entry_2 { |
ac27a0ec DK |
1518 | __le32 inode; /* Inode number */ |
1519 | __le16 rec_len; /* Directory entry length */ | |
1520 | __u8 name_len; /* Name length */ | |
1521 | __u8 file_type; | |
617ba13b | 1522 | char name[EXT4_NAME_LEN]; /* File name */ |
ac27a0ec DK |
1523 | }; |
1524 | ||
1525 | /* | |
617ba13b | 1526 | * Ext4 directory file types. Only the low 3 bits are used. The |
ac27a0ec DK |
1527 | * other bits are reserved for now. |
1528 | */ | |
617ba13b MC |
1529 | #define EXT4_FT_UNKNOWN 0 |
1530 | #define EXT4_FT_REG_FILE 1 | |
1531 | #define EXT4_FT_DIR 2 | |
1532 | #define EXT4_FT_CHRDEV 3 | |
1533 | #define EXT4_FT_BLKDEV 4 | |
1534 | #define EXT4_FT_FIFO 5 | |
1535 | #define EXT4_FT_SOCK 6 | |
1536 | #define EXT4_FT_SYMLINK 7 | |
ac27a0ec | 1537 | |
617ba13b | 1538 | #define EXT4_FT_MAX 8 |
ac27a0ec DK |
1539 | |
1540 | /* | |
617ba13b | 1541 | * EXT4_DIR_PAD defines the directory entries boundaries |
ac27a0ec DK |
1542 | * |
1543 | * NOTE: It must be a multiple of 4 | |
1544 | */ | |
617ba13b MC |
1545 | #define EXT4_DIR_PAD 4 |
1546 | #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1) | |
1547 | #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \ | |
1548 | ~EXT4_DIR_ROUND) | |
a72d7f83 JK |
1549 | #define EXT4_MAX_REC_LEN ((1<<16)-1) |
1550 | ||
0cfc9255 ES |
1551 | /* |
1552 | * If we ever get support for fs block sizes > page_size, we'll need | |
1553 | * to remove the #if statements in the next two functions... | |
1554 | */ | |
1555 | static inline unsigned int | |
1556 | ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize) | |
1557 | { | |
1558 | unsigned len = le16_to_cpu(dlen); | |
1559 | ||
1560 | #if (PAGE_CACHE_SIZE >= 65536) | |
1561 | if (len == EXT4_MAX_REC_LEN || len == 0) | |
1562 | return blocksize; | |
1563 | return (len & 65532) | ((len & 3) << 16); | |
1564 | #else | |
1565 | return len; | |
1566 | #endif | |
1567 | } | |
1568 | ||
1569 | static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize) | |
1570 | { | |
1571 | if ((len > blocksize) || (blocksize > (1 << 18)) || (len & 3)) | |
1572 | BUG(); | |
1573 | #if (PAGE_CACHE_SIZE >= 65536) | |
1574 | if (len < 65536) | |
1575 | return cpu_to_le16(len); | |
1576 | if (len == blocksize) { | |
1577 | if (blocksize == 65536) | |
1578 | return cpu_to_le16(EXT4_MAX_REC_LEN); | |
1579 | else | |
1580 | return cpu_to_le16(0); | |
1581 | } | |
1582 | return cpu_to_le16((len & 65532) | ((len >> 16) & 3)); | |
1583 | #else | |
1584 | return cpu_to_le16(len); | |
1585 | #endif | |
1586 | } | |
1587 | ||
ac27a0ec DK |
1588 | /* |
1589 | * Hash Tree Directory indexing | |
1590 | * (c) Daniel Phillips, 2001 | |
1591 | */ | |
1592 | ||
4074fe37 ES |
1593 | #define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \ |
1594 | EXT4_FEATURE_COMPAT_DIR_INDEX) && \ | |
12e9b892 | 1595 | ext4_test_inode_flag((dir), EXT4_INODE_INDEX)) |
617ba13b MC |
1596 | #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX) |
1597 | #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1) | |
ac27a0ec DK |
1598 | |
1599 | /* Legal values for the dx_root hash_version field: */ | |
1600 | ||
1601 | #define DX_HASH_LEGACY 0 | |
1602 | #define DX_HASH_HALF_MD4 1 | |
1603 | #define DX_HASH_TEA 2 | |
f99b2589 TT |
1604 | #define DX_HASH_LEGACY_UNSIGNED 3 |
1605 | #define DX_HASH_HALF_MD4_UNSIGNED 4 | |
1606 | #define DX_HASH_TEA_UNSIGNED 5 | |
ac27a0ec DK |
1607 | |
1608 | #ifdef __KERNEL__ | |
1609 | ||
1610 | /* hash info structure used by the directory hash */ | |
1611 | struct dx_hash_info | |
1612 | { | |
1613 | u32 hash; | |
1614 | u32 minor_hash; | |
1615 | int hash_version; | |
1616 | u32 *seed; | |
1617 | }; | |
1618 | ||
617ba13b | 1619 | #define EXT4_HTREE_EOF 0x7fffffff |
ac27a0ec DK |
1620 | |
1621 | /* | |
617ba13b | 1622 | * Control parameters used by ext4_htree_next_block |
ac27a0ec DK |
1623 | */ |
1624 | #define HASH_NB_ALWAYS 1 | |
1625 | ||
1626 | ||
1627 | /* | |
1628 | * Describe an inode's exact location on disk and in memory | |
1629 | */ | |
617ba13b | 1630 | struct ext4_iloc |
ac27a0ec DK |
1631 | { |
1632 | struct buffer_head *bh; | |
1633 | unsigned long offset; | |
fd2d4291 | 1634 | ext4_group_t block_group; |
ac27a0ec DK |
1635 | }; |
1636 | ||
617ba13b | 1637 | static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc) |
ac27a0ec | 1638 | { |
617ba13b | 1639 | return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset); |
ac27a0ec DK |
1640 | } |
1641 | ||
1642 | /* | |
1643 | * This structure is stuffed into the struct file's private_data field | |
1644 | * for directories. It is where we put information so that we can do | |
1645 | * readdir operations in hash tree order. | |
1646 | */ | |
1647 | struct dir_private_info { | |
1648 | struct rb_root root; | |
1649 | struct rb_node *curr_node; | |
1650 | struct fname *extra_fname; | |
1651 | loff_t last_pos; | |
1652 | __u32 curr_hash; | |
1653 | __u32 curr_minor_hash; | |
1654 | __u32 next_hash; | |
1655 | }; | |
1656 | ||
1657 | /* calculate the first block number of the group */ | |
617ba13b | 1658 | static inline ext4_fsblk_t |
fd2d4291 | 1659 | ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no) |
ac27a0ec | 1660 | { |
617ba13b MC |
1661 | return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) + |
1662 | le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block); | |
ac27a0ec DK |
1663 | } |
1664 | ||
1665 | /* | |
1666 | * Special error return code only used by dx_probe() and its callers. | |
1667 | */ | |
1668 | #define ERR_BAD_DX_DIR -75000 | |
1669 | ||
72b64b59 | 1670 | void ext4_get_group_no_and_offset(struct super_block *sb, ext4_fsblk_t blocknr, |
a9df9a49 | 1671 | ext4_group_t *blockgrpp, ext4_grpblk_t *offsetp); |
3a5b2ecd | 1672 | |
bfff6873 LC |
1673 | /* |
1674 | * Timeout and state flag for lazy initialization inode thread. | |
1675 | */ | |
1676 | #define EXT4_DEF_LI_WAIT_MULT 10 | |
1677 | #define EXT4_DEF_LI_MAX_START_DELAY 5 | |
1678 | #define EXT4_LAZYINIT_QUIT 0x0001 | |
1679 | #define EXT4_LAZYINIT_RUNNING 0x0002 | |
1680 | ||
1681 | /* | |
1682 | * Lazy inode table initialization info | |
1683 | */ | |
1684 | struct ext4_lazy_init { | |
1685 | unsigned long li_state; | |
bfff6873 LC |
1686 | struct list_head li_request_list; |
1687 | struct mutex li_list_mtx; | |
1688 | }; | |
1689 | ||
1690 | struct ext4_li_request { | |
1691 | struct super_block *lr_super; | |
1692 | struct ext4_sb_info *lr_sbi; | |
1693 | ext4_group_t lr_next_group; | |
1694 | struct list_head lr_request; | |
1695 | unsigned long lr_next_sched; | |
1696 | unsigned long lr_timeout; | |
1697 | }; | |
1698 | ||
857ac889 LC |
1699 | struct ext4_features { |
1700 | struct kobject f_kobj; | |
1701 | struct completion f_kobj_unregister; | |
1702 | }; | |
1703 | ||
c5e06d10 JL |
1704 | /* |
1705 | * This structure will be used for multiple mount protection. It will be | |
1706 | * written into the block number saved in the s_mmp_block field in the | |
1707 | * superblock. Programs that check MMP should assume that if | |
1708 | * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe | |
1709 | * to use the filesystem, regardless of how old the timestamp is. | |
1710 | */ | |
1711 | #define EXT4_MMP_MAGIC 0x004D4D50U /* ASCII for MMP */ | |
1712 | #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */ | |
1713 | #define EXT4_MMP_SEQ_FSCK 0xE24D4D50U /* mmp_seq value when being fscked */ | |
1714 | #define EXT4_MMP_SEQ_MAX 0xE24D4D4FU /* maximum valid mmp_seq value */ | |
1715 | ||
1716 | struct mmp_struct { | |
1717 | __le32 mmp_magic; /* Magic number for MMP */ | |
1718 | __le32 mmp_seq; /* Sequence no. updated periodically */ | |
1719 | ||
1720 | /* | |
1721 | * mmp_time, mmp_nodename & mmp_bdevname are only used for information | |
1722 | * purposes and do not affect the correctness of the algorithm | |
1723 | */ | |
1724 | __le64 mmp_time; /* Time last updated */ | |
1725 | char mmp_nodename[64]; /* Node which last updated MMP block */ | |
1726 | char mmp_bdevname[32]; /* Bdev which last updated MMP block */ | |
1727 | ||
1728 | /* | |
1729 | * mmp_check_interval is used to verify if the MMP block has been | |
1730 | * updated on the block device. The value is updated based on the | |
1731 | * maximum time to write the MMP block during an update cycle. | |
1732 | */ | |
1733 | __le16 mmp_check_interval; | |
1734 | ||
1735 | __le16 mmp_pad1; | |
1736 | __le32 mmp_pad2[227]; | |
1737 | }; | |
1738 | ||
1739 | /* arguments passed to the mmp thread */ | |
1740 | struct mmpd_data { | |
1741 | struct buffer_head *bh; /* bh from initial read_mmp_block() */ | |
1742 | struct super_block *sb; /* super block of the fs */ | |
1743 | }; | |
1744 | ||
1745 | /* | |
1746 | * Check interval multiplier | |
1747 | * The MMP block is written every update interval and initially checked every | |
1748 | * update interval x the multiplier (the value is then adapted based on the | |
1749 | * write latency). The reason is that writes can be delayed under load and we | |
1750 | * don't want readers to incorrectly assume that the filesystem is no longer | |
1751 | * in use. | |
1752 | */ | |
1753 | #define EXT4_MMP_CHECK_MULT 2UL | |
1754 | ||
1755 | /* | |
1756 | * Minimum interval for MMP checking in seconds. | |
1757 | */ | |
1758 | #define EXT4_MMP_MIN_CHECK_INTERVAL 5UL | |
1759 | ||
1760 | /* | |
1761 | * Maximum interval for MMP checking in seconds. | |
1762 | */ | |
1763 | #define EXT4_MMP_MAX_CHECK_INTERVAL 300UL | |
1764 | ||
ac27a0ec DK |
1765 | /* |
1766 | * Function prototypes | |
1767 | */ | |
1768 | ||
1769 | /* | |
1770 | * Ok, these declarations are also in <linux/kernel.h> but none of the | |
617ba13b | 1771 | * ext4 source programs needs to include it so they are duplicated here. |
ac27a0ec | 1772 | */ |
8c55e204 DK |
1773 | # define NORET_TYPE /**/ |
1774 | # define ATTRIB_NORET __attribute__((noreturn)) | |
1775 | # define NORET_AND noreturn, | |
ac27a0ec | 1776 | |
498e5f24 TT |
1777 | /* bitmap.c */ |
1778 | extern unsigned int ext4_count_free(struct buffer_head *, unsigned); | |
1779 | ||
ac27a0ec | 1780 | /* balloc.c */ |
3a5b2ecd MC |
1781 | extern unsigned int ext4_block_group(struct super_block *sb, |
1782 | ext4_fsblk_t blocknr); | |
1783 | extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb, | |
1784 | ext4_fsblk_t blocknr); | |
fd2d4291 AM |
1785 | extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group); |
1786 | extern unsigned long ext4_bg_num_gdb(struct super_block *sb, | |
1787 | ext4_group_t group); | |
7061eba7 | 1788 | extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode, |
55f020db AH |
1789 | ext4_fsblk_t goal, |
1790 | unsigned int flags, | |
1791 | unsigned long *count, | |
1792 | int *errp); | |
e7d5f315 TT |
1793 | extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi, |
1794 | s64 nclusters, unsigned int flags); | |
5dee5437 | 1795 | extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *); |
af5bc92d | 1796 | extern void ext4_check_blocks_bitmap(struct super_block *); |
617ba13b | 1797 | extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb, |
fd2d4291 | 1798 | ext4_group_t block_group, |
ac27a0ec | 1799 | struct buffer_head ** bh); |
617ba13b | 1800 | extern int ext4_should_retry_alloc(struct super_block *sb, int *retries); |
813e5727 TT |
1801 | |
1802 | extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb, | |
1803 | ext4_group_t block_group); | |
1804 | extern int ext4_wait_block_bitmap(struct super_block *sb, | |
1805 | ext4_group_t block_group, | |
1806 | struct buffer_head *bh); | |
1807 | extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb, | |
1808 | ext4_group_t block_group); | |
fd034a84 TT |
1809 | extern void ext4_init_block_bitmap(struct super_block *sb, |
1810 | struct buffer_head *bh, | |
1811 | ext4_group_t group, | |
1812 | struct ext4_group_desc *desc); | |
cff1dfd7 TT |
1813 | extern unsigned ext4_free_clusters_after_init(struct super_block *sb, |
1814 | ext4_group_t block_group, | |
1815 | struct ext4_group_desc *gdp); | |
d5b8f310 TT |
1816 | extern unsigned ext4_num_overhead_clusters(struct super_block *sb, |
1817 | ext4_group_t block_group, | |
1818 | struct ext4_group_desc *gdp); | |
f86186b4 | 1819 | ext4_fsblk_t ext4_inode_to_goal_block(struct inode *); |
ac27a0ec DK |
1820 | |
1821 | /* dir.c */ | |
60fd4da3 | 1822 | extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *, |
f7c21177 | 1823 | struct file *, |
60fd4da3 TT |
1824 | struct ext4_dir_entry_2 *, |
1825 | struct buffer_head *, unsigned int); | |
f7c21177 TT |
1826 | #define ext4_check_dir_entry(dir, filp, de, bh, offset) \ |
1827 | unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \ | |
1828 | (de), (bh), (offset))) | |
617ba13b | 1829 | extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash, |
ac27a0ec | 1830 | __u32 minor_hash, |
617ba13b MC |
1831 | struct ext4_dir_entry_2 *dirent); |
1832 | extern void ext4_htree_free_dir_info(struct dir_private_info *p); | |
ac27a0ec DK |
1833 | |
1834 | /* fsync.c */ | |
02c24a82 | 1835 | extern int ext4_sync_file(struct file *, loff_t, loff_t, int); |
3889fd57 | 1836 | extern int ext4_flush_completed_IO(struct inode *); |
ac27a0ec DK |
1837 | |
1838 | /* hash.c */ | |
617ba13b | 1839 | extern int ext4fs_dirhash(const char *name, int len, struct |
ac27a0ec DK |
1840 | dx_hash_info *hinfo); |
1841 | ||
1842 | /* ialloc.c */ | |
dcca3fec | 1843 | extern struct inode *ext4_new_inode(handle_t *, struct inode *, umode_t, |
5cb81dab DM |
1844 | const struct qstr *qstr, __u32 goal, |
1845 | uid_t *owner); | |
af5bc92d TT |
1846 | extern void ext4_free_inode(handle_t *, struct inode *); |
1847 | extern struct inode * ext4_orphan_get(struct super_block *, unsigned long); | |
1848 | extern unsigned long ext4_count_free_inodes(struct super_block *); | |
1849 | extern unsigned long ext4_count_dirs(struct super_block *); | |
1850 | extern void ext4_check_inodes_bitmap(struct super_block *); | |
61d08673 | 1851 | extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap); |
bfff6873 LC |
1852 | extern int ext4_init_inode_table(struct super_block *sb, |
1853 | ext4_group_t group, int barrier); | |
813e5727 | 1854 | extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate); |
ac27a0ec | 1855 | |
c9de560d AT |
1856 | /* mballoc.c */ |
1857 | extern long ext4_mb_stats; | |
1858 | extern long ext4_mb_max_to_scan; | |
1859 | extern int ext4_mb_init(struct super_block *, int); | |
1860 | extern int ext4_mb_release(struct super_block *); | |
1861 | extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *, | |
1862 | struct ext4_allocation_request *, int *); | |
1863 | extern int ext4_mb_reserve_blocks(struct super_block *, int); | |
c2ea3fde | 1864 | extern void ext4_discard_preallocations(struct inode *); |
5dabfc78 TT |
1865 | extern int __init ext4_init_mballoc(void); |
1866 | extern void ext4_exit_mballoc(void); | |
44338711 | 1867 | extern void ext4_free_blocks(handle_t *handle, struct inode *inode, |
e6362609 TT |
1868 | struct buffer_head *bh, ext4_fsblk_t block, |
1869 | unsigned long count, int flags); | |
920313a7 | 1870 | extern int ext4_mb_add_groupinfo(struct super_block *sb, |
5f21b0e6 | 1871 | ext4_group_t i, struct ext4_group_desc *desc); |
cc7365df | 1872 | extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb, |
2846e820 | 1873 | ext4_fsblk_t block, unsigned long count); |
7360d173 LC |
1874 | extern int ext4_trim_fs(struct super_block *, struct fstrim_range *); |
1875 | ||
ac27a0ec | 1876 | /* inode.c */ |
725d26d3 AK |
1877 | struct buffer_head *ext4_getblk(handle_t *, struct inode *, |
1878 | ext4_lblk_t, int, int *); | |
1879 | struct buffer_head *ext4_bread(handle_t *, struct inode *, | |
1880 | ext4_lblk_t, int, int *); | |
6873fa0d ES |
1881 | int ext4_get_block(struct inode *inode, sector_t iblock, |
1882 | struct buffer_head *bh_result, int create); | |
ac27a0ec | 1883 | |
1d1fe1ee | 1884 | extern struct inode *ext4_iget(struct super_block *, unsigned long); |
a9185b41 | 1885 | extern int ext4_write_inode(struct inode *, struct writeback_control *); |
af5bc92d | 1886 | extern int ext4_setattr(struct dentry *, struct iattr *); |
3e3398a0 MC |
1887 | extern int ext4_getattr(struct vfsmount *mnt, struct dentry *dentry, |
1888 | struct kstat *stat); | |
0930fcc1 AV |
1889 | extern void ext4_evict_inode(struct inode *); |
1890 | extern void ext4_clear_inode(struct inode *); | |
af5bc92d | 1891 | extern int ext4_sync_inode(handle_t *, struct inode *); |
aa385729 | 1892 | extern void ext4_dirty_inode(struct inode *, int); |
617ba13b MC |
1893 | extern int ext4_change_inode_journal_flag(struct inode *, int); |
1894 | extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *); | |
91ef4caf | 1895 | extern int ext4_can_truncate(struct inode *inode); |
af5bc92d | 1896 | extern void ext4_truncate(struct inode *); |
a4bb6b64 | 1897 | extern int ext4_punch_hole(struct file *file, loff_t offset, loff_t length); |
487caeef | 1898 | extern int ext4_truncate_restart_trans(handle_t *, struct inode *, int nblocks); |
617ba13b | 1899 | extern void ext4_set_inode_flags(struct inode *); |
ff9ddf7e | 1900 | extern void ext4_get_inode_flags(struct ext4_inode_info *); |
ccd2506b | 1901 | extern int ext4_alloc_da_blocks(struct inode *inode); |
617ba13b | 1902 | extern void ext4_set_aops(struct inode *inode); |
a86c6181 | 1903 | extern int ext4_writepage_trans_blocks(struct inode *); |
f3bd1f3f | 1904 | extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks); |
4e96b2db AH |
1905 | extern int ext4_discard_partial_page_buffers(handle_t *handle, |
1906 | struct address_space *mapping, loff_t from, | |
1907 | loff_t length, int flags); | |
c2ec175c | 1908 | extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf); |
a9e7f447 | 1909 | extern qsize_t *ext4_get_reserved_space(struct inode *inode); |
5f634d06 AK |
1910 | extern void ext4_da_update_reserve_space(struct inode *inode, |
1911 | int used, int quota_claim); | |
dae1e52c AG |
1912 | |
1913 | /* indirect.c */ | |
1914 | extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode, | |
1915 | struct ext4_map_blocks *map, int flags); | |
1916 | extern ssize_t ext4_ind_direct_IO(int rw, struct kiocb *iocb, | |
1917 | const struct iovec *iov, loff_t offset, | |
1918 | unsigned long nr_segs); | |
1919 | extern int ext4_ind_calc_metadata_amount(struct inode *inode, sector_t lblock); | |
1920 | extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks, int chunk); | |
ff9893dc AG |
1921 | extern void ext4_ind_truncate(struct inode *inode); |
1922 | ||
ac27a0ec | 1923 | /* ioctl.c */ |
5cdd7b2d | 1924 | extern long ext4_ioctl(struct file *, unsigned int, unsigned long); |
af5bc92d | 1925 | extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long); |
ac27a0ec | 1926 | |
c14c6fd5 | 1927 | /* migrate.c */ |
2a43a878 | 1928 | extern int ext4_ext_migrate(struct inode *); |
3d0518f4 | 1929 | |
ac27a0ec | 1930 | /* namei.c */ |
617ba13b MC |
1931 | extern int ext4_orphan_add(handle_t *, struct inode *); |
1932 | extern int ext4_orphan_del(handle_t *, struct inode *); | |
1933 | extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash, | |
ac27a0ec DK |
1934 | __u32 start_minor_hash, __u32 *next_hash); |
1935 | ||
1936 | /* resize.c */ | |
617ba13b MC |
1937 | extern int ext4_group_add(struct super_block *sb, |
1938 | struct ext4_new_group_data *input); | |
1939 | extern int ext4_group_extend(struct super_block *sb, | |
1940 | struct ext4_super_block *es, | |
1941 | ext4_fsblk_t n_blocks_count); | |
19c5246d | 1942 | extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count); |
ac27a0ec DK |
1943 | |
1944 | /* super.c */ | |
9933fc0a TT |
1945 | extern void *ext4_kvmalloc(size_t size, gfp_t flags); |
1946 | extern void *ext4_kvzalloc(size_t size, gfp_t flags); | |
1947 | extern void ext4_kvfree(void *ptr); | |
b9075fa9 JP |
1948 | extern __printf(4, 5) |
1949 | void __ext4_error(struct super_block *, const char *, unsigned int, | |
1950 | const char *, ...); | |
c398eda0 TT |
1951 | #define ext4_error(sb, message...) __ext4_error(sb, __func__, \ |
1952 | __LINE__, ## message) | |
b9075fa9 JP |
1953 | extern __printf(5, 6) |
1954 | void ext4_error_inode(struct inode *, const char *, unsigned int, ext4_fsblk_t, | |
1955 | const char *, ...); | |
1956 | extern __printf(5, 6) | |
1957 | void ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t, | |
1958 | const char *, ...); | |
c398eda0 TT |
1959 | extern void __ext4_std_error(struct super_block *, const char *, |
1960 | unsigned int, int); | |
b9075fa9 JP |
1961 | extern __printf(4, 5) |
1962 | void __ext4_abort(struct super_block *, const char *, unsigned int, | |
1963 | const char *, ...); | |
c67d859e | 1964 | #define ext4_abort(sb, message...) __ext4_abort(sb, __func__, \ |
c398eda0 | 1965 | __LINE__, ## message) |
b9075fa9 JP |
1966 | extern __printf(4, 5) |
1967 | void __ext4_warning(struct super_block *, const char *, unsigned int, | |
1968 | const char *, ...); | |
c398eda0 TT |
1969 | #define ext4_warning(sb, message...) __ext4_warning(sb, __func__, \ |
1970 | __LINE__, ## message) | |
b9075fa9 JP |
1971 | extern __printf(3, 4) |
1972 | void ext4_msg(struct super_block *, const char *, const char *, ...); | |
c5e06d10 JL |
1973 | extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp, |
1974 | const char *, unsigned int, const char *); | |
1975 | #define dump_mmp_msg(sb, mmp, msg) __dump_mmp_msg(sb, mmp, __func__, \ | |
1976 | __LINE__, msg) | |
b9075fa9 JP |
1977 | extern __printf(7, 8) |
1978 | void __ext4_grp_locked_error(const char *, unsigned int, | |
1979 | struct super_block *, ext4_group_t, | |
1980 | unsigned long, ext4_fsblk_t, | |
1981 | const char *, ...); | |
e29136f8 TT |
1982 | #define ext4_grp_locked_error(sb, grp, message...) \ |
1983 | __ext4_grp_locked_error(__func__, __LINE__, (sb), (grp), ## message) | |
af5bc92d | 1984 | extern void ext4_update_dynamic_rev(struct super_block *sb); |
99e6f829 AK |
1985 | extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb, |
1986 | __u32 compat); | |
1987 | extern int ext4_update_rocompat_feature(handle_t *handle, | |
1988 | struct super_block *sb, __u32 rocompat); | |
1989 | extern int ext4_update_incompat_feature(handle_t *handle, | |
1990 | struct super_block *sb, __u32 incompat); | |
8fadc143 AR |
1991 | extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb, |
1992 | struct ext4_group_desc *bg); | |
1993 | extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb, | |
1994 | struct ext4_group_desc *bg); | |
1995 | extern ext4_fsblk_t ext4_inode_table(struct super_block *sb, | |
1996 | struct ext4_group_desc *bg); | |
021b65bb TT |
1997 | extern __u32 ext4_free_group_clusters(struct super_block *sb, |
1998 | struct ext4_group_desc *bg); | |
560671a0 AK |
1999 | extern __u32 ext4_free_inodes_count(struct super_block *sb, |
2000 | struct ext4_group_desc *bg); | |
2001 | extern __u32 ext4_used_dirs_count(struct super_block *sb, | |
2002 | struct ext4_group_desc *bg); | |
2003 | extern __u32 ext4_itable_unused_count(struct super_block *sb, | |
2004 | struct ext4_group_desc *bg); | |
8fadc143 AR |
2005 | extern void ext4_block_bitmap_set(struct super_block *sb, |
2006 | struct ext4_group_desc *bg, ext4_fsblk_t blk); | |
2007 | extern void ext4_inode_bitmap_set(struct super_block *sb, | |
2008 | struct ext4_group_desc *bg, ext4_fsblk_t blk); | |
2009 | extern void ext4_inode_table_set(struct super_block *sb, | |
2010 | struct ext4_group_desc *bg, ext4_fsblk_t blk); | |
021b65bb TT |
2011 | extern void ext4_free_group_clusters_set(struct super_block *sb, |
2012 | struct ext4_group_desc *bg, | |
2013 | __u32 count); | |
560671a0 AK |
2014 | extern void ext4_free_inodes_set(struct super_block *sb, |
2015 | struct ext4_group_desc *bg, __u32 count); | |
2016 | extern void ext4_used_dirs_set(struct super_block *sb, | |
2017 | struct ext4_group_desc *bg, __u32 count); | |
2018 | extern void ext4_itable_unused_set(struct super_block *sb, | |
2019 | struct ext4_group_desc *bg, __u32 count); | |
bb23c20a TT |
2020 | extern __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 group, |
2021 | struct ext4_group_desc *gdp); | |
2022 | extern int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 group, | |
2023 | struct ext4_group_desc *gdp); | |
bd81d8ee LV |
2024 | |
2025 | static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es) | |
2026 | { | |
2027 | return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) | | |
6bc9feff | 2028 | le32_to_cpu(es->s_blocks_count_lo); |
bd81d8ee LV |
2029 | } |
2030 | ||
2031 | static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es) | |
2032 | { | |
2033 | return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) | | |
308ba3ec | 2034 | le32_to_cpu(es->s_r_blocks_count_lo); |
bd81d8ee LV |
2035 | } |
2036 | ||
2037 | static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es) | |
2038 | { | |
2039 | return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) | | |
308ba3ec | 2040 | le32_to_cpu(es->s_free_blocks_count_lo); |
bd81d8ee LV |
2041 | } |
2042 | ||
2043 | static inline void ext4_blocks_count_set(struct ext4_super_block *es, | |
2044 | ext4_fsblk_t blk) | |
2045 | { | |
6bc9feff | 2046 | es->s_blocks_count_lo = cpu_to_le32((u32)blk); |
bd81d8ee LV |
2047 | es->s_blocks_count_hi = cpu_to_le32(blk >> 32); |
2048 | } | |
2049 | ||
2050 | static inline void ext4_free_blocks_count_set(struct ext4_super_block *es, | |
2051 | ext4_fsblk_t blk) | |
2052 | { | |
308ba3ec | 2053 | es->s_free_blocks_count_lo = cpu_to_le32((u32)blk); |
bd81d8ee LV |
2054 | es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32); |
2055 | } | |
2056 | ||
2057 | static inline void ext4_r_blocks_count_set(struct ext4_super_block *es, | |
2058 | ext4_fsblk_t blk) | |
2059 | { | |
308ba3ec | 2060 | es->s_r_blocks_count_lo = cpu_to_le32((u32)blk); |
bd81d8ee LV |
2061 | es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32); |
2062 | } | |
2063 | ||
a48380f7 AK |
2064 | static inline loff_t ext4_isize(struct ext4_inode *raw_inode) |
2065 | { | |
06a279d6 TT |
2066 | if (S_ISREG(le16_to_cpu(raw_inode->i_mode))) |
2067 | return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) | | |
2068 | le32_to_cpu(raw_inode->i_size_lo); | |
2069 | else | |
2070 | return (loff_t) le32_to_cpu(raw_inode->i_size_lo); | |
a48380f7 | 2071 | } |
bd81d8ee | 2072 | |
a48380f7 AK |
2073 | static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size) |
2074 | { | |
2075 | raw_inode->i_size_lo = cpu_to_le32(i_size); | |
2076 | raw_inode->i_size_high = cpu_to_le32(i_size >> 32); | |
2077 | } | |
ac27a0ec | 2078 | |
c9de560d AT |
2079 | static inline |
2080 | struct ext4_group_info *ext4_get_group_info(struct super_block *sb, | |
af5bc92d | 2081 | ext4_group_t group) |
c9de560d AT |
2082 | { |
2083 | struct ext4_group_info ***grp_info; | |
2084 | long indexv, indexh; | |
2085 | grp_info = EXT4_SB(sb)->s_group_info; | |
2086 | indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb)); | |
2087 | indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1); | |
2088 | return grp_info[indexv][indexh]; | |
2089 | } | |
2090 | ||
8df9675f TT |
2091 | /* |
2092 | * Reading s_groups_count requires using smp_rmb() afterwards. See | |
2093 | * the locking protocol documented in the comments of ext4_group_add() | |
2094 | * in resize.c | |
2095 | */ | |
2096 | static inline ext4_group_t ext4_get_groups_count(struct super_block *sb) | |
2097 | { | |
2098 | ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count; | |
2099 | ||
2100 | smp_rmb(); | |
2101 | return ngroups; | |
2102 | } | |
c9de560d | 2103 | |
772cb7c8 JS |
2104 | static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi, |
2105 | ext4_group_t block_group) | |
2106 | { | |
2107 | return block_group >> sbi->s_log_groups_per_flex; | |
2108 | } | |
2109 | ||
2110 | static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi) | |
2111 | { | |
2112 | return 1 << sbi->s_log_groups_per_flex; | |
2113 | } | |
2114 | ||
617ba13b | 2115 | #define ext4_std_error(sb, errno) \ |
ac27a0ec DK |
2116 | do { \ |
2117 | if ((errno)) \ | |
c398eda0 | 2118 | __ext4_std_error((sb), __func__, __LINE__, (errno)); \ |
ac27a0ec DK |
2119 | } while (0) |
2120 | ||
a30d542a | 2121 | #ifdef CONFIG_SMP |
df55c99d TT |
2122 | /* Each CPU can accumulate percpu_counter_batch clusters in their local |
2123 | * counters. So we need to make sure we have free clusters more | |
179f7ebf | 2124 | * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times. |
a30d542a | 2125 | */ |
df55c99d | 2126 | #define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids)) |
a30d542a | 2127 | #else |
df55c99d | 2128 | #define EXT4_FREECLUSTERS_WATERMARK 0 |
a30d542a AK |
2129 | #endif |
2130 | ||
cf17fea6 AK |
2131 | static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize) |
2132 | { | |
2133 | /* | |
2134 | * XXX: replace with spinlock if seen contended -bzzz | |
2135 | */ | |
2136 | down_write(&EXT4_I(inode)->i_data_sem); | |
2137 | if (newsize > EXT4_I(inode)->i_disksize) | |
2138 | EXT4_I(inode)->i_disksize = newsize; | |
2139 | up_write(&EXT4_I(inode)->i_data_sem); | |
2140 | return ; | |
2141 | } | |
a30d542a | 2142 | |
5d1b1b3f AK |
2143 | struct ext4_group_info { |
2144 | unsigned long bb_state; | |
2145 | struct rb_root bb_free_root; | |
a36b4498 ES |
2146 | ext4_grpblk_t bb_first_free; /* first free block */ |
2147 | ext4_grpblk_t bb_free; /* total free blocks */ | |
2148 | ext4_grpblk_t bb_fragments; /* nr of freespace fragments */ | |
8a57d9d6 | 2149 | ext4_grpblk_t bb_largest_free_order;/* order of largest frag in BG */ |
5d1b1b3f AK |
2150 | struct list_head bb_prealloc_list; |
2151 | #ifdef DOUBLE_CHECK | |
2152 | void *bb_bitmap; | |
2153 | #endif | |
2154 | struct rw_semaphore alloc_sem; | |
a36b4498 ES |
2155 | ext4_grpblk_t bb_counters[]; /* Nr of free power-of-two-block |
2156 | * regions, index is order. | |
2157 | * bb_counters[3] = 5 means | |
2158 | * 5 free 8-block regions. */ | |
5d1b1b3f AK |
2159 | }; |
2160 | ||
3d56b8d2 TM |
2161 | #define EXT4_GROUP_INFO_NEED_INIT_BIT 0 |
2162 | #define EXT4_GROUP_INFO_WAS_TRIMMED_BIT 1 | |
5d1b1b3f AK |
2163 | |
2164 | #define EXT4_MB_GRP_NEED_INIT(grp) \ | |
2165 | (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state))) | |
2166 | ||
3d56b8d2 TM |
2167 | #define EXT4_MB_GRP_WAS_TRIMMED(grp) \ |
2168 | (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) | |
2169 | #define EXT4_MB_GRP_SET_TRIMMED(grp) \ | |
2170 | (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) | |
2171 | #define EXT4_MB_GRP_CLEAR_TRIMMED(grp) \ | |
2172 | (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) | |
2173 | ||
50797481 TT |
2174 | #define EXT4_MAX_CONTENTION 8 |
2175 | #define EXT4_CONTENTION_THRESHOLD 2 | |
2176 | ||
955ce5f5 AK |
2177 | static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb, |
2178 | ext4_group_t group) | |
5d1b1b3f | 2179 | { |
955ce5f5 AK |
2180 | return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group); |
2181 | } | |
5d1b1b3f | 2182 | |
50797481 TT |
2183 | /* |
2184 | * Returns true if the filesystem is busy enough that attempts to | |
2185 | * access the block group locks has run into contention. | |
2186 | */ | |
2187 | static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi) | |
2188 | { | |
2189 | return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD); | |
2190 | } | |
2191 | ||
955ce5f5 AK |
2192 | static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group) |
2193 | { | |
50797481 TT |
2194 | spinlock_t *lock = ext4_group_lock_ptr(sb, group); |
2195 | if (spin_trylock(lock)) | |
2196 | /* | |
2197 | * We're able to grab the lock right away, so drop the | |
2198 | * lock contention counter. | |
2199 | */ | |
2200 | atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0); | |
2201 | else { | |
2202 | /* | |
2203 | * The lock is busy, so bump the contention counter, | |
2204 | * and then wait on the spin lock. | |
2205 | */ | |
2206 | atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1, | |
2207 | EXT4_MAX_CONTENTION); | |
2208 | spin_lock(lock); | |
2209 | } | |
5d1b1b3f AK |
2210 | } |
2211 | ||
2212 | static inline void ext4_unlock_group(struct super_block *sb, | |
2213 | ext4_group_t group) | |
2214 | { | |
955ce5f5 | 2215 | spin_unlock(ext4_group_lock_ptr(sb, group)); |
5d1b1b3f AK |
2216 | } |
2217 | ||
a0375156 TT |
2218 | static inline void ext4_mark_super_dirty(struct super_block *sb) |
2219 | { | |
2220 | if (EXT4_SB(sb)->s_journal == NULL) | |
2221 | sb->s_dirt =1; | |
2222 | } | |
2223 | ||
1f7d1e77 TT |
2224 | /* |
2225 | * Block validity checking | |
2226 | */ | |
2227 | #define ext4_check_indirect_blockref(inode, bh) \ | |
2228 | ext4_check_blockref(__func__, __LINE__, inode, \ | |
2229 | (__le32 *)(bh)->b_data, \ | |
2230 | EXT4_ADDR_PER_BLOCK((inode)->i_sb)) | |
2231 | ||
2232 | #define ext4_ind_check_inode(inode) \ | |
2233 | ext4_check_blockref(__func__, __LINE__, inode, \ | |
2234 | EXT4_I(inode)->i_data, \ | |
2235 | EXT4_NDIR_BLOCKS) | |
2236 | ||
ac27a0ec DK |
2237 | /* |
2238 | * Inodes and files operations | |
2239 | */ | |
2240 | ||
2241 | /* dir.c */ | |
617ba13b | 2242 | extern const struct file_operations ext4_dir_operations; |
ac27a0ec DK |
2243 | |
2244 | /* file.c */ | |
c5ef1c42 | 2245 | extern const struct inode_operations ext4_file_inode_operations; |
617ba13b | 2246 | extern const struct file_operations ext4_file_operations; |
e0d10bfa | 2247 | extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin); |
ac27a0ec DK |
2248 | |
2249 | /* namei.c */ | |
c5ef1c42 AV |
2250 | extern const struct inode_operations ext4_dir_inode_operations; |
2251 | extern const struct inode_operations ext4_special_inode_operations; | |
596397b7 | 2252 | extern struct dentry *ext4_get_parent(struct dentry *child); |
ac27a0ec DK |
2253 | |
2254 | /* symlink.c */ | |
c5ef1c42 AV |
2255 | extern const struct inode_operations ext4_symlink_inode_operations; |
2256 | extern const struct inode_operations ext4_fast_symlink_inode_operations; | |
ac27a0ec | 2257 | |
6fd058f7 TT |
2258 | /* block_validity */ |
2259 | extern void ext4_release_system_zone(struct super_block *sb); | |
2260 | extern int ext4_setup_system_zone(struct super_block *sb); | |
5dabfc78 TT |
2261 | extern int __init ext4_init_system_zone(void); |
2262 | extern void ext4_exit_system_zone(void); | |
6fd058f7 TT |
2263 | extern int ext4_data_block_valid(struct ext4_sb_info *sbi, |
2264 | ext4_fsblk_t start_blk, | |
2265 | unsigned int count); | |
1f7d1e77 TT |
2266 | extern int ext4_check_blockref(const char *, unsigned int, |
2267 | struct inode *, __le32 *, unsigned int); | |
6fd058f7 | 2268 | |
a86c6181 AT |
2269 | /* extents.c */ |
2270 | extern int ext4_ext_tree_init(handle_t *handle, struct inode *); | |
2271 | extern int ext4_ext_writepage_trans_blocks(struct inode *, int); | |
a02908f1 MC |
2272 | extern int ext4_ext_index_trans_blocks(struct inode *inode, int nrblocks, |
2273 | int chunk); | |
e35fd660 TT |
2274 | extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode, |
2275 | struct ext4_map_blocks *map, int flags); | |
cf108bca | 2276 | extern void ext4_ext_truncate(struct inode *); |
a4bb6b64 AH |
2277 | extern int ext4_ext_punch_hole(struct file *file, loff_t offset, |
2278 | loff_t length); | |
a86c6181 AT |
2279 | extern void ext4_ext_init(struct super_block *); |
2280 | extern void ext4_ext_release(struct super_block *); | |
2fe17c10 | 2281 | extern long ext4_fallocate(struct file *file, int mode, loff_t offset, |
a2df2a63 | 2282 | loff_t len); |
0031462b | 2283 | extern int ext4_convert_unwritten_extents(struct inode *inode, loff_t offset, |
a1de02dc | 2284 | ssize_t len); |
e35fd660 TT |
2285 | extern int ext4_map_blocks(handle_t *handle, struct inode *inode, |
2286 | struct ext4_map_blocks *map, int flags); | |
3a06d778 AK |
2287 | extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, |
2288 | __u64 start, __u64 len); | |
748de673 AF |
2289 | /* move_extent.c */ |
2290 | extern int ext4_move_extents(struct file *o_filp, struct file *d_filp, | |
2291 | __u64 start_orig, __u64 start_donor, | |
2292 | __u64 len, __u64 *moved_len); | |
2293 | ||
bd2d0210 | 2294 | /* page-io.c */ |
5dabfc78 TT |
2295 | extern int __init ext4_init_pageio(void); |
2296 | extern void ext4_exit_pageio(void); | |
f7ad6d2e | 2297 | extern void ext4_ioend_wait(struct inode *); |
bd2d0210 TT |
2298 | extern void ext4_free_io_end(ext4_io_end_t *io); |
2299 | extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags); | |
2300 | extern int ext4_end_io_nolock(ext4_io_end_t *io); | |
2301 | extern void ext4_io_submit(struct ext4_io_submit *io); | |
2302 | extern int ext4_bio_write_page(struct ext4_io_submit *io, | |
2303 | struct page *page, | |
2304 | int len, | |
2305 | struct writeback_control *wbc); | |
3a06d778 | 2306 | |
c5e06d10 JL |
2307 | /* mmp.c */ |
2308 | extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t); | |
2309 | ||
744692dc JZ |
2310 | /* BH_Uninit flag: blocks are allocated but uninitialized on disk */ |
2311 | enum ext4_state_bits { | |
2312 | BH_Uninit /* blocks are allocated but uninitialized on disk */ | |
2313 | = BH_JBDPrivateStart, | |
7b415bf6 AK |
2314 | BH_AllocFromCluster, /* allocated blocks were part of already |
2315 | * allocated cluster. Note that this flag will | |
2316 | * never, ever appear in a buffer_head's state | |
2317 | * flag. See EXT4_MAP_FROM_CLUSTER to see where | |
2318 | * this is used. */ | |
5356f261 AK |
2319 | BH_Da_Mapped, /* Delayed allocated block that now has a mapping. This |
2320 | * flag is set when ext4_map_blocks is called on a | |
2321 | * delayed allocated block to get its real mapping. */ | |
744692dc JZ |
2322 | }; |
2323 | ||
2324 | BUFFER_FNS(Uninit, uninit) | |
2325 | TAS_BUFFER_FNS(Uninit, uninit) | |
5356f261 | 2326 | BUFFER_FNS(Da_Mapped, da_mapped) |
744692dc | 2327 | |
2ccb5fb9 AK |
2328 | /* |
2329 | * Add new method to test wether block and inode bitmaps are properly | |
2330 | * initialized. With uninit_bg reading the block from disk is not enough | |
2331 | * to mark the bitmap uptodate. We need to also zero-out the bitmap | |
2332 | */ | |
2333 | #define BH_BITMAP_UPTODATE BH_JBDPrivateStart | |
2334 | ||
2335 | static inline int bitmap_uptodate(struct buffer_head *bh) | |
2336 | { | |
2337 | return (buffer_uptodate(bh) && | |
2338 | test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state)); | |
2339 | } | |
2340 | static inline void set_bitmap_uptodate(struct buffer_head *bh) | |
2341 | { | |
2342 | set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state); | |
2343 | } | |
2344 | ||
731eb1a0 AM |
2345 | #define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1) |
2346 | ||
e9e3bcec ES |
2347 | /* For ioend & aio unwritten conversion wait queues */ |
2348 | #define EXT4_WQ_HASH_SZ 37 | |
2349 | #define ext4_ioend_wq(v) (&ext4__ioend_wq[((unsigned long)(v)) %\ | |
2350 | EXT4_WQ_HASH_SZ]) | |
2351 | #define ext4_aio_mutex(v) (&ext4__aio_mutex[((unsigned long)(v)) %\ | |
2352 | EXT4_WQ_HASH_SZ]) | |
2353 | extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ]; | |
2354 | extern struct mutex ext4__aio_mutex[EXT4_WQ_HASH_SZ]; | |
2355 | ||
8f82f840 YY |
2356 | #define EXT4_RESIZING 0 |
2357 | extern int ext4_resize_begin(struct super_block *sb); | |
2358 | extern void ext4_resize_end(struct super_block *sb); | |
2359 | ||
ac27a0ec DK |
2360 | #endif /* __KERNEL__ */ |
2361 | ||
d8990240 AK |
2362 | #include "ext4_extents.h" |
2363 | ||
3dcf5451 | 2364 | #endif /* _EXT4_H */ |