Commit | Line | Data |
---|---|---|
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 | 28 | #include <linux/timer.h> |
a4dad1ae | 29 | #include <linux/version.h> |
ca0faba0 TT |
30 | #include <linux/wait.h> |
31 | #include <linux/blockgroup_lock.h> | |
32 | #include <linux/percpu_counter.h> | |
efbed4dc | 33 | #include <linux/ratelimit.h> |
0441984a | 34 | #include <crypto/hash.h> |
a633f5a3 | 35 | #include <linux/falloc.h> |
4d92dc0f BH |
36 | #ifdef __KERNEL__ |
37 | #include <linux/compat.h> | |
38 | #endif | |
c9de560d | 39 | |
ac27a0ec | 40 | /* |
8a35694e | 41 | * The fourth extended filesystem constants/structures |
ac27a0ec DK |
42 | */ |
43 | ||
a2821e34 AZ |
44 | /* |
45 | * with AGGRESSIVE_CHECK allocator runs consistency checks over | |
46 | * structures. these checks slow things down a lot | |
47 | */ | |
48 | #define AGGRESSIVE_CHECK__ | |
49 | ||
50 | /* | |
51 | * with DOUBLE_CHECK defined mballoc creates persistent in-core | |
52 | * bitmaps, maintains and uses them to check for double allocations | |
53 | */ | |
54 | #define DOUBLE_CHECK__ | |
55 | ||
ac27a0ec | 56 | /* |
617ba13b | 57 | * Define EXT4FS_DEBUG to produce debug messages |
ac27a0ec | 58 | */ |
617ba13b | 59 | #undef EXT4FS_DEBUG |
ac27a0ec | 60 | |
ac27a0ec DK |
61 | /* |
62 | * Debug code | |
63 | */ | |
617ba13b MC |
64 | #ifdef EXT4FS_DEBUG |
65 | #define ext4_debug(f, a...) \ | |
ac27a0ec | 66 | do { \ |
af5bc92d | 67 | printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \ |
4db9c54a | 68 | __FILE__, __LINE__, __func__); \ |
af5bc92d | 69 | printk(KERN_DEBUG f, ## a); \ |
ac27a0ec DK |
70 | } while (0) |
71 | #else | |
ace36ad4 | 72 | #define ext4_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__) |
ac27a0ec DK |
73 | #endif |
74 | ||
4a092d73 TT |
75 | /* |
76 | * Turn on EXT_DEBUG to get lots of info about extents operations. | |
77 | */ | |
78 | #define EXT_DEBUG__ | |
79 | #ifdef EXT_DEBUG | |
80 | #define ext_debug(fmt, ...) printk(fmt, ##__VA_ARGS__) | |
81 | #else | |
82 | #define ext_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__) | |
83 | #endif | |
84 | ||
d444c3c3 TT |
85 | /* data type for block offset of block group */ |
86 | typedef int ext4_grpblk_t; | |
87 | ||
88 | /* data type for filesystem-wide blocks number */ | |
89 | typedef unsigned long long ext4_fsblk_t; | |
90 | ||
91 | /* data type for file logical block number */ | |
92 | typedef __u32 ext4_lblk_t; | |
93 | ||
94 | /* data type for block group number */ | |
95 | typedef unsigned int ext4_group_t; | |
96 | ||
331573fe NJ |
97 | enum SHIFT_DIRECTION { |
98 | SHIFT_LEFT = 0, | |
99 | SHIFT_RIGHT, | |
100 | }; | |
101 | ||
296c355c | 102 | /* |
60e6679e | 103 | * Flags used in mballoc's allocation_context flags field. |
296c355c TT |
104 | * |
105 | * Also used to show what's going on for debugging purposes when the | |
106 | * flag field is exported via the traceport interface | |
107 | */ | |
d444c3c3 | 108 | |
c9de560d | 109 | /* prefer goal again. length */ |
0ef90db9 | 110 | #define EXT4_MB_HINT_MERGE 0x0001 |
c9de560d | 111 | /* blocks already reserved */ |
0ef90db9 | 112 | #define EXT4_MB_HINT_RESERVED 0x0002 |
c9de560d | 113 | /* metadata is being allocated */ |
0ef90db9 | 114 | #define EXT4_MB_HINT_METADATA 0x0004 |
c9de560d | 115 | /* first blocks in the file */ |
0ef90db9 | 116 | #define EXT4_MB_HINT_FIRST 0x0008 |
c9de560d | 117 | /* search for the best chunk */ |
0ef90db9 | 118 | #define EXT4_MB_HINT_BEST 0x0010 |
c9de560d | 119 | /* data is being allocated */ |
0ef90db9 | 120 | #define EXT4_MB_HINT_DATA 0x0020 |
c9de560d | 121 | /* don't preallocate (for tails) */ |
0ef90db9 | 122 | #define EXT4_MB_HINT_NOPREALLOC 0x0040 |
c9de560d | 123 | /* allocate for locality group */ |
0ef90db9 | 124 | #define EXT4_MB_HINT_GROUP_ALLOC 0x0080 |
c9de560d | 125 | /* allocate goal blocks or none */ |
0ef90db9 | 126 | #define EXT4_MB_HINT_GOAL_ONLY 0x0100 |
c9de560d | 127 | /* goal is meaningful */ |
0ef90db9 | 128 | #define EXT4_MB_HINT_TRY_GOAL 0x0200 |
d2a17637 | 129 | /* blocks already pre-reserved by delayed allocation */ |
0ef90db9 | 130 | #define EXT4_MB_DELALLOC_RESERVED 0x0400 |
4ba74d00 TT |
131 | /* We are doing stream allocation */ |
132 | #define EXT4_MB_STREAM_ALLOC 0x0800 | |
55f020db AH |
133 | /* Use reserved root blocks if needed */ |
134 | #define EXT4_MB_USE_ROOT_BLOCKS 0x1000 | |
27dd4385 LC |
135 | /* Use blocks from reserved pool */ |
136 | #define EXT4_MB_USE_RESERVED 0x2000 | |
c9de560d AT |
137 | |
138 | struct ext4_allocation_request { | |
139 | /* target inode for block we're allocating */ | |
140 | struct inode *inode; | |
726447d8 ES |
141 | /* how many blocks we want to allocate */ |
142 | unsigned int len; | |
c9de560d AT |
143 | /* logical block in target inode */ |
144 | ext4_lblk_t logical; | |
c9de560d AT |
145 | /* the closest logical allocated block to the left */ |
146 | ext4_lblk_t lleft; | |
c9de560d AT |
147 | /* the closest logical allocated block to the right */ |
148 | ext4_lblk_t lright; | |
726447d8 ES |
149 | /* phys. target (a hint) */ |
150 | ext4_fsblk_t goal; | |
151 | /* phys. block for the closest logical allocated block to the left */ | |
152 | ext4_fsblk_t pleft; | |
153 | /* phys. block for the closest logical allocated block to the right */ | |
c9de560d | 154 | ext4_fsblk_t pright; |
c9de560d | 155 | /* flags. see above EXT4_MB_HINT_* */ |
498e5f24 | 156 | unsigned int flags; |
c9de560d AT |
157 | }; |
158 | ||
e35fd660 TT |
159 | /* |
160 | * Logical to physical block mapping, used by ext4_map_blocks() | |
161 | * | |
162 | * This structure is used to pass requests into ext4_map_blocks() as | |
163 | * well as to store the information returned by ext4_map_blocks(). It | |
164 | * takes less room on the stack than a struct buffer_head. | |
165 | */ | |
166 | #define EXT4_MAP_NEW (1 << BH_New) | |
167 | #define EXT4_MAP_MAPPED (1 << BH_Mapped) | |
168 | #define EXT4_MAP_UNWRITTEN (1 << BH_Unwritten) | |
169 | #define EXT4_MAP_BOUNDARY (1 << BH_Boundary) | |
e35fd660 | 170 | #define EXT4_MAP_FLAGS (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\ |
cbd7584e | 171 | EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY) |
e35fd660 TT |
172 | |
173 | struct ext4_map_blocks { | |
174 | ext4_fsblk_t m_pblk; | |
175 | ext4_lblk_t m_lblk; | |
176 | unsigned int m_len; | |
177 | unsigned int m_flags; | |
178 | }; | |
179 | ||
bd2d0210 TT |
180 | /* |
181 | * Flags for ext4_io_end->flags | |
182 | */ | |
183 | #define EXT4_IO_END_UNWRITTEN 0x0001 | |
bd2d0210 | 184 | |
4188188b | 185 | /* |
556615dc | 186 | * For converting unwritten extents on a work queue. 'handle' is used for |
6b523df4 | 187 | * buffered writeback. |
4188188b | 188 | */ |
0031462b | 189 | typedef struct ext4_io_end { |
5b3ff237 | 190 | struct list_head list; /* per-file finished IO list */ |
6b523df4 JK |
191 | handle_t *handle; /* handle reserved for extent |
192 | * conversion */ | |
0031462b | 193 | struct inode *inode; /* file being written to */ |
b0857d30 JK |
194 | struct bio *bio; /* Linked list of completed |
195 | * bios covering the extent */ | |
8d5d02e6 | 196 | unsigned int flag; /* unwritten or not */ |
3bd6ad7b | 197 | atomic_t count; /* reference counter */ |
a1de02dc ES |
198 | loff_t offset; /* offset in the file */ |
199 | ssize_t size; /* size of the extent */ | |
0031462b MC |
200 | } ext4_io_end_t; |
201 | ||
bd2d0210 | 202 | struct ext4_io_submit { |
5a33911f | 203 | struct writeback_control *io_wbc; |
bd2d0210 TT |
204 | struct bio *io_bio; |
205 | ext4_io_end_t *io_end; | |
bd2d0210 TT |
206 | sector_t io_next_block; |
207 | }; | |
208 | ||
ac27a0ec DK |
209 | /* |
210 | * Special inodes numbers | |
211 | */ | |
617ba13b MC |
212 | #define EXT4_BAD_INO 1 /* Bad blocks inode */ |
213 | #define EXT4_ROOT_INO 2 /* Root inode */ | |
ae812306 AK |
214 | #define EXT4_USR_QUOTA_INO 3 /* User quota inode */ |
215 | #define EXT4_GRP_QUOTA_INO 4 /* Group quota inode */ | |
617ba13b MC |
216 | #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */ |
217 | #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */ | |
218 | #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */ | |
219 | #define EXT4_JOURNAL_INO 8 /* Journal inode */ | |
ac27a0ec | 220 | |
617ba13b MC |
221 | /* First non-reserved inode for old ext4 filesystems */ |
222 | #define EXT4_GOOD_OLD_FIRST_INO 11 | |
ac27a0ec DK |
223 | |
224 | /* | |
225 | * Maximal count of links to a file | |
226 | */ | |
f8628a14 | 227 | #define EXT4_LINK_MAX 65000 |
ac27a0ec DK |
228 | |
229 | /* | |
230 | * Macro-instructions used to manage several block sizes | |
231 | */ | |
617ba13b | 232 | #define EXT4_MIN_BLOCK_SIZE 1024 |
afc7cbca TS |
233 | #define EXT4_MAX_BLOCK_SIZE 65536 |
234 | #define EXT4_MIN_BLOCK_LOG_SIZE 10 | |
fb1813f4 | 235 | #define EXT4_MAX_BLOCK_LOG_SIZE 16 |
ac27a0ec | 236 | #ifdef __KERNEL__ |
617ba13b | 237 | # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize) |
ac27a0ec | 238 | #else |
617ba13b | 239 | # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size) |
ac27a0ec | 240 | #endif |
af5bc92d | 241 | #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32)) |
281b5995 TT |
242 | #define EXT4_CLUSTER_SIZE(s) (EXT4_BLOCK_SIZE(s) << \ |
243 | EXT4_SB(s)->s_cluster_bits) | |
ac27a0ec | 244 | #ifdef __KERNEL__ |
617ba13b | 245 | # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits) |
281b5995 | 246 | # define EXT4_CLUSTER_BITS(s) (EXT4_SB(s)->s_cluster_bits) |
ac27a0ec | 247 | #else |
617ba13b | 248 | # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10) |
ac27a0ec DK |
249 | #endif |
250 | #ifdef __KERNEL__ | |
617ba13b MC |
251 | #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits) |
252 | #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size) | |
253 | #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino) | |
ac27a0ec | 254 | #else |
617ba13b MC |
255 | #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ |
256 | EXT4_GOOD_OLD_INODE_SIZE : \ | |
ac27a0ec | 257 | (s)->s_inode_size) |
617ba13b MC |
258 | #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ |
259 | EXT4_GOOD_OLD_FIRST_INO : \ | |
ac27a0ec DK |
260 | (s)->s_first_ino) |
261 | #endif | |
a2df2a63 | 262 | #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits))) |
ac27a0ec | 263 | |
d5b8f310 TT |
264 | /* Translate a block number to a cluster number */ |
265 | #define EXT4_B2C(sbi, blk) ((blk) >> (sbi)->s_cluster_bits) | |
266 | /* Translate a cluster number to a block number */ | |
267 | #define EXT4_C2B(sbi, cluster) ((cluster) << (sbi)->s_cluster_bits) | |
268 | /* Translate # of blks to # of clusters */ | |
269 | #define EXT4_NUM_B2C(sbi, blks) (((blks) + (sbi)->s_cluster_ratio - 1) >> \ | |
270 | (sbi)->s_cluster_bits) | |
f5a44db5 TT |
271 | /* Mask out the low bits to get the starting block of the cluster */ |
272 | #define EXT4_PBLK_CMASK(s, pblk) ((pblk) & \ | |
273 | ~((ext4_fsblk_t) (s)->s_cluster_ratio - 1)) | |
274 | #define EXT4_LBLK_CMASK(s, lblk) ((lblk) & \ | |
275 | ~((ext4_lblk_t) (s)->s_cluster_ratio - 1)) | |
276 | /* Get the cluster offset */ | |
277 | #define EXT4_PBLK_COFF(s, pblk) ((pblk) & \ | |
278 | ((ext4_fsblk_t) (s)->s_cluster_ratio - 1)) | |
279 | #define EXT4_LBLK_COFF(s, lblk) ((lblk) & \ | |
280 | ((ext4_lblk_t) (s)->s_cluster_ratio - 1)) | |
d5b8f310 | 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 | 293 | __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */ |
e6153918 DW |
294 | __le32 bg_exclude_bitmap_lo; /* Exclude bitmap for snapshots */ |
295 | __le16 bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bbitmap) LE */ | |
296 | __le16 bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+ibitmap) LE */ | |
560671a0 | 297 | __le16 bg_itable_unused_lo; /* Unused inodes count */ |
717d50e4 | 298 | __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */ |
8fadc143 AR |
299 | __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */ |
300 | __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */ | |
301 | __le32 bg_inode_table_hi; /* Inodes table block MSB */ | |
91b51a01 CL |
302 | __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */ |
303 | __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */ | |
304 | __le16 bg_used_dirs_count_hi; /* Directories count MSB */ | |
560671a0 | 305 | __le16 bg_itable_unused_hi; /* Unused inodes count MSB */ |
e6153918 DW |
306 | __le32 bg_exclude_bitmap_hi; /* Exclude bitmap block MSB */ |
307 | __le16 bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bbitmap) BE */ | |
308 | __le16 bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+ibitmap) BE */ | |
309 | __u32 bg_reserved; | |
ac27a0ec DK |
310 | }; |
311 | ||
41a246d1 DW |
312 | #define EXT4_BG_INODE_BITMAP_CSUM_HI_END \ |
313 | (offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \ | |
314 | sizeof(__le16)) | |
315 | #define EXT4_BG_BLOCK_BITMAP_CSUM_HI_END \ | |
316 | (offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \ | |
317 | sizeof(__le16)) | |
318 | ||
772cb7c8 JS |
319 | /* |
320 | * Structure of a flex block group info | |
321 | */ | |
322 | ||
323 | struct flex_groups { | |
90ba983f TT |
324 | atomic64_t free_clusters; |
325 | atomic_t free_inodes; | |
326 | atomic_t used_dirs; | |
772cb7c8 JS |
327 | }; |
328 | ||
717d50e4 AD |
329 | #define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */ |
330 | #define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */ | |
331 | #define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */ | |
332 | ||
ac27a0ec DK |
333 | /* |
334 | * Macro-instructions used to manage group descriptors | |
335 | */ | |
0d1ee42f | 336 | #define EXT4_MIN_DESC_SIZE 32 |
8fadc143 | 337 | #define EXT4_MIN_DESC_SIZE_64BIT 64 |
0d1ee42f AR |
338 | #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE |
339 | #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size) | |
ac27a0ec | 340 | #ifdef __KERNEL__ |
617ba13b | 341 | # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group) |
281b5995 | 342 | # define EXT4_CLUSTERS_PER_GROUP(s) (EXT4_SB(s)->s_clusters_per_group) |
617ba13b MC |
343 | # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block) |
344 | # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group) | |
345 | # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits) | |
ac27a0ec | 346 | #else |
617ba13b | 347 | # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group) |
0d1ee42f | 348 | # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s)) |
617ba13b | 349 | # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group) |
ac27a0ec DK |
350 | #endif |
351 | ||
352 | /* | |
353 | * Constants relative to the data blocks | |
354 | */ | |
617ba13b MC |
355 | #define EXT4_NDIR_BLOCKS 12 |
356 | #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS | |
357 | #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1) | |
358 | #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1) | |
359 | #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1) | |
ac27a0ec DK |
360 | |
361 | /* | |
362 | * Inode flags | |
363 | */ | |
617ba13b MC |
364 | #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */ |
365 | #define EXT4_UNRM_FL 0x00000002 /* Undelete */ | |
366 | #define EXT4_COMPR_FL 0x00000004 /* Compress file */ | |
367 | #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */ | |
368 | #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */ | |
369 | #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */ | |
370 | #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */ | |
371 | #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */ | |
ac27a0ec | 372 | /* Reserved for compression usage... */ |
617ba13b MC |
373 | #define EXT4_DIRTY_FL 0x00000100 |
374 | #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ | |
375 | #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */ | |
3edc18d8 TT |
376 | /* nb: was previously EXT2_ECOMPR_FL */ |
377 | #define EXT4_ENCRYPT_FL 0x00000800 /* encrypted file */ | |
ac27a0ec | 378 | /* End compression flags --- maybe not all used */ |
617ba13b MC |
379 | #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */ |
380 | #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */ | |
381 | #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */ | |
382 | #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */ | |
383 | #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */ | |
384 | #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/ | |
8180a562 | 385 | #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */ |
a86c6181 | 386 | #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */ |
f710b4b9 | 387 | #define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */ |
c8d46e41 | 388 | #define EXT4_EOFBLOCKS_FL 0x00400000 /* Blocks allocated beyond EOF */ |
67cf5b09 | 389 | #define EXT4_INLINE_DATA_FL 0x10000000 /* Inode has inline data. */ |
8b4953e1 | 390 | #define EXT4_PROJINHERIT_FL 0x20000000 /* Create with parents projid */ |
8180a562 | 391 | #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */ |
ac27a0ec | 392 | |
040cb378 LX |
393 | #define EXT4_FL_USER_VISIBLE 0x304BDFFF /* User visible flags */ |
394 | #define EXT4_FL_USER_MODIFIABLE 0x204380FF /* User modifiable flags */ | |
ac27a0ec | 395 | |
9b7365fc LX |
396 | #define EXT4_FL_XFLAG_VISIBLE (EXT4_SYNC_FL | \ |
397 | EXT4_IMMUTABLE_FL | \ | |
398 | EXT4_APPEND_FL | \ | |
399 | EXT4_NODUMP_FL | \ | |
400 | EXT4_NOATIME_FL | \ | |
401 | EXT4_PROJINHERIT_FL) | |
402 | ||
8fa43a81 DG |
403 | /* Flags that should be inherited by new inodes from their parent. */ |
404 | #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\ | |
1cd9f097 | 405 | EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\ |
8fa43a81 | 406 | EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\ |
040cb378 LX |
407 | EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL |\ |
408 | EXT4_PROJINHERIT_FL) | |
8fa43a81 | 409 | |
2dc6b0d4 DG |
410 | /* Flags that are appropriate for regular files (all but dir-specific ones). */ |
411 | #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL)) | |
412 | ||
413 | /* Flags that are appropriate for non-directories/regular files. */ | |
414 | #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL) | |
415 | ||
416 | /* Mask out flags that are inappropriate for the given type of inode. */ | |
417 | static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags) | |
418 | { | |
419 | if (S_ISDIR(mode)) | |
420 | return flags; | |
421 | else if (S_ISREG(mode)) | |
422 | return flags & EXT4_REG_FLMASK; | |
423 | else | |
424 | return flags & EXT4_OTHER_FLMASK; | |
425 | } | |
426 | ||
12e9b892 DM |
427 | /* |
428 | * Inode flags used for atomic set/get | |
429 | */ | |
430 | enum { | |
431 | EXT4_INODE_SECRM = 0, /* Secure deletion */ | |
432 | EXT4_INODE_UNRM = 1, /* Undelete */ | |
433 | EXT4_INODE_COMPR = 2, /* Compress file */ | |
434 | EXT4_INODE_SYNC = 3, /* Synchronous updates */ | |
435 | EXT4_INODE_IMMUTABLE = 4, /* Immutable file */ | |
436 | EXT4_INODE_APPEND = 5, /* writes to file may only append */ | |
437 | EXT4_INODE_NODUMP = 6, /* do not dump file */ | |
438 | EXT4_INODE_NOATIME = 7, /* do not update atime */ | |
439 | /* Reserved for compression usage... */ | |
440 | EXT4_INODE_DIRTY = 8, | |
441 | EXT4_INODE_COMPRBLK = 9, /* One or more compressed clusters */ | |
442 | EXT4_INODE_NOCOMPR = 10, /* Don't compress */ | |
f542fbe8 | 443 | EXT4_INODE_ENCRYPT = 11, /* Encrypted file */ |
12e9b892 DM |
444 | /* End compression flags --- maybe not all used */ |
445 | EXT4_INODE_INDEX = 12, /* hash-indexed directory */ | |
446 | EXT4_INODE_IMAGIC = 13, /* AFS directory */ | |
447 | EXT4_INODE_JOURNAL_DATA = 14, /* file data should be journaled */ | |
448 | EXT4_INODE_NOTAIL = 15, /* file tail should not be merged */ | |
449 | EXT4_INODE_DIRSYNC = 16, /* dirsync behaviour (directories only) */ | |
450 | EXT4_INODE_TOPDIR = 17, /* Top of directory hierarchies*/ | |
451 | EXT4_INODE_HUGE_FILE = 18, /* Set to each huge file */ | |
452 | EXT4_INODE_EXTENTS = 19, /* Inode uses extents */ | |
453 | EXT4_INODE_EA_INODE = 21, /* Inode used for large EA */ | |
454 | EXT4_INODE_EOFBLOCKS = 22, /* Blocks allocated beyond EOF */ | |
67cf5b09 | 455 | EXT4_INODE_INLINE_DATA = 28, /* Data in inode. */ |
8b4953e1 | 456 | EXT4_INODE_PROJINHERIT = 29, /* Create with parents projid */ |
12e9b892 DM |
457 | EXT4_INODE_RESERVED = 31, /* reserved for ext4 lib */ |
458 | }; | |
459 | ||
12e9b892 | 460 | /* |
9a4c8019 CM |
461 | * Since it's pretty easy to mix up bit numbers and hex values, we use a |
462 | * build-time check to make sure that EXT4_XXX_FL is consistent with respect to | |
463 | * EXT4_INODE_XXX. If all is well, the macros will be dropped, so, it won't cost | |
464 | * any extra space in the compiled kernel image, otherwise, the build will fail. | |
465 | * It's important that these values are the same, since we are using | |
466 | * EXT4_INODE_XXX to test for flag values, but EXT4_XXX_FL must be consistent | |
467 | * with the values of FS_XXX_FL defined in include/linux/fs.h and the on-disk | |
468 | * values found in ext2, ext3 and ext4 filesystems, and of course the values | |
469 | * defined in e2fsprogs. | |
12e9b892 DM |
470 | * |
471 | * It's not paranoia if the Murphy's Law really *is* out to get you. :-) | |
472 | */ | |
9a4c8019 CM |
473 | #define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG)) |
474 | #define CHECK_FLAG_VALUE(FLAG) BUILD_BUG_ON(!TEST_FLAG_VALUE(FLAG)) | |
475 | ||
12e9b892 DM |
476 | static inline void ext4_check_flag_values(void) |
477 | { | |
478 | CHECK_FLAG_VALUE(SECRM); | |
479 | CHECK_FLAG_VALUE(UNRM); | |
480 | CHECK_FLAG_VALUE(COMPR); | |
481 | CHECK_FLAG_VALUE(SYNC); | |
482 | CHECK_FLAG_VALUE(IMMUTABLE); | |
483 | CHECK_FLAG_VALUE(APPEND); | |
484 | CHECK_FLAG_VALUE(NODUMP); | |
485 | CHECK_FLAG_VALUE(NOATIME); | |
486 | CHECK_FLAG_VALUE(DIRTY); | |
487 | CHECK_FLAG_VALUE(COMPRBLK); | |
488 | CHECK_FLAG_VALUE(NOCOMPR); | |
3edc18d8 | 489 | CHECK_FLAG_VALUE(ENCRYPT); |
12e9b892 DM |
490 | CHECK_FLAG_VALUE(INDEX); |
491 | CHECK_FLAG_VALUE(IMAGIC); | |
492 | CHECK_FLAG_VALUE(JOURNAL_DATA); | |
493 | CHECK_FLAG_VALUE(NOTAIL); | |
494 | CHECK_FLAG_VALUE(DIRSYNC); | |
495 | CHECK_FLAG_VALUE(TOPDIR); | |
496 | CHECK_FLAG_VALUE(HUGE_FILE); | |
497 | CHECK_FLAG_VALUE(EXTENTS); | |
498 | CHECK_FLAG_VALUE(EA_INODE); | |
499 | CHECK_FLAG_VALUE(EOFBLOCKS); | |
67cf5b09 | 500 | CHECK_FLAG_VALUE(INLINE_DATA); |
8b4953e1 | 501 | CHECK_FLAG_VALUE(PROJINHERIT); |
12e9b892 DM |
502 | CHECK_FLAG_VALUE(RESERVED); |
503 | } | |
504 | ||
ac27a0ec | 505 | /* Used to pass group descriptor data when online resize is done */ |
617ba13b | 506 | struct ext4_new_group_input { |
8c55e204 DK |
507 | __u32 group; /* Group number for this data */ |
508 | __u64 block_bitmap; /* Absolute block number of block bitmap */ | |
509 | __u64 inode_bitmap; /* Absolute block number of inode bitmap */ | |
510 | __u64 inode_table; /* Absolute block number of inode table start */ | |
511 | __u32 blocks_count; /* Total number of blocks in this group */ | |
512 | __u16 reserved_blocks; /* Number of reserved blocks in this group */ | |
ac27a0ec DK |
513 | __u16 unused; |
514 | }; | |
515 | ||
4d92dc0f BH |
516 | #if defined(__KERNEL__) && defined(CONFIG_COMPAT) |
517 | struct compat_ext4_new_group_input { | |
518 | u32 group; | |
519 | compat_u64 block_bitmap; | |
520 | compat_u64 inode_bitmap; | |
521 | compat_u64 inode_table; | |
522 | u32 blocks_count; | |
523 | u16 reserved_blocks; | |
524 | u16 unused; | |
525 | }; | |
526 | #endif | |
527 | ||
617ba13b MC |
528 | /* The struct ext4_new_group_input in kernel space, with free_blocks_count */ |
529 | struct ext4_new_group_data { | |
ac27a0ec | 530 | __u32 group; |
bd81d8ee LV |
531 | __u64 block_bitmap; |
532 | __u64 inode_bitmap; | |
533 | __u64 inode_table; | |
ac27a0ec DK |
534 | __u32 blocks_count; |
535 | __u16 reserved_blocks; | |
536 | __u16 unused; | |
537 | __u32 free_blocks_count; | |
538 | }; | |
539 | ||
33afdcc5 YY |
540 | /* Indexes used to index group tables in ext4_new_group_data */ |
541 | enum { | |
542 | BLOCK_BITMAP = 0, /* block bitmap */ | |
543 | INODE_BITMAP, /* inode bitmap */ | |
544 | INODE_TABLE, /* inode tables */ | |
545 | GROUP_TABLE_COUNT, | |
546 | }; | |
547 | ||
a2df2a63 | 548 | /* |
79e83036 | 549 | * Flags used by ext4_map_blocks() |
a2df2a63 | 550 | */ |
556615dc | 551 | /* Allocate any needed blocks and/or convert an unwritten |
c2177057 | 552 | extent to be an initialized ext4 */ |
2ac3b6e0 | 553 | #define EXT4_GET_BLOCKS_CREATE 0x0001 |
556615dc LC |
554 | /* Request the creation of an unwritten extent */ |
555 | #define EXT4_GET_BLOCKS_UNWRIT_EXT 0x0002 | |
556 | #define EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT (EXT4_GET_BLOCKS_UNWRIT_EXT|\ | |
c2177057 | 557 | EXT4_GET_BLOCKS_CREATE) |
27dd4385 LC |
558 | /* Caller is from the delayed allocation writeout path |
559 | * finally doing the actual allocation of delayed blocks */ | |
03f5d8bc | 560 | #define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004 |
0031462b | 561 | /* caller is from the direct IO path, request to creation of an |
556615dc | 562 | unwritten extents if not allocated, split the unwritten |
0031462b | 563 | extent if blocks has been preallocated already*/ |
c7064ef1 | 564 | #define EXT4_GET_BLOCKS_PRE_IO 0x0008 |
1296cc85 | 565 | #define EXT4_GET_BLOCKS_CONVERT 0x0010 |
c7064ef1 | 566 | #define EXT4_GET_BLOCKS_IO_CREATE_EXT (EXT4_GET_BLOCKS_PRE_IO|\ |
556615dc | 567 | EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT) |
c7064ef1 JZ |
568 | /* Convert extent to initialized after IO complete */ |
569 | #define EXT4_GET_BLOCKS_IO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT|\ | |
556615dc | 570 | EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT) |
27dd4385 LC |
571 | /* Eventual metadata allocation (due to growing extent tree) |
572 | * should not fail, so try to use reserved blocks for that.*/ | |
573 | #define EXT4_GET_BLOCKS_METADATA_NOFAIL 0x0020 | |
556b27ab VH |
574 | /* Don't normalize allocation size (used for fallocate) */ |
575 | #define EXT4_GET_BLOCKS_NO_NORMALIZE 0x0040 | |
a4e5d88b DM |
576 | /* Request will not result in inode size update (user for fallocate) */ |
577 | #define EXT4_GET_BLOCKS_KEEP_SIZE 0x0080 | |
b8a86845 | 578 | /* Convert written extents to unwritten */ |
2dcba478 | 579 | #define EXT4_GET_BLOCKS_CONVERT_UNWRITTEN 0x0100 |
c86d8db3 JK |
580 | /* Write zeros to newly created written extents */ |
581 | #define EXT4_GET_BLOCKS_ZERO 0x0200 | |
582 | #define EXT4_GET_BLOCKS_CREATE_ZERO (EXT4_GET_BLOCKS_CREATE |\ | |
583 | EXT4_GET_BLOCKS_ZERO) | |
ac27a0ec | 584 | |
107a7bd3 | 585 | /* |
7869a4a6 | 586 | * The bit position of these flags must not overlap with any of the |
ed8a1a76 | 587 | * EXT4_GET_BLOCKS_*. They are used by ext4_find_extent(), |
107a7bd3 | 588 | * read_extent_tree_block(), ext4_split_extent_at(), |
7869a4a6 TT |
589 | * ext4_ext_insert_extent(), and ext4_ext_create_new_leaf(). |
590 | * EXT4_EX_NOCACHE is used to indicate that the we shouldn't be | |
591 | * caching the extents when reading from the extent tree while a | |
592 | * truncate or punch hole operation is in progress. | |
107a7bd3 | 593 | */ |
d26e2c4d TT |
594 | #define EXT4_EX_NOCACHE 0x40000000 |
595 | #define EXT4_EX_FORCE_CACHE 0x20000000 | |
107a7bd3 | 596 | |
e6362609 TT |
597 | /* |
598 | * Flags used by ext4_free_blocks | |
599 | */ | |
600 | #define EXT4_FREE_BLOCKS_METADATA 0x0001 | |
601 | #define EXT4_FREE_BLOCKS_FORGET 0x0002 | |
1f2acb60 | 602 | #define EXT4_FREE_BLOCKS_VALIDATED 0x0004 |
7132de74 | 603 | #define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE 0x0008 |
84130193 TT |
604 | #define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER 0x0010 |
605 | #define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER 0x0020 | |
e6362609 | 606 | |
f542fbe8 TT |
607 | /* Encryption algorithms */ |
608 | #define EXT4_ENCRYPTION_MODE_INVALID 0 | |
609 | #define EXT4_ENCRYPTION_MODE_AES_256_XTS 1 | |
610 | #define EXT4_ENCRYPTION_MODE_AES_256_GCM 2 | |
611 | #define EXT4_ENCRYPTION_MODE_AES_256_CBC 3 | |
612 | #define EXT4_ENCRYPTION_MODE_AES_256_CTS 4 | |
613 | ||
9bd8212f MH |
614 | #include "ext4_crypto.h" |
615 | ||
ac27a0ec DK |
616 | /* |
617 | * ioctl commands | |
618 | */ | |
617ba13b MC |
619 | #define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS |
620 | #define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS | |
621 | #define EXT4_IOC_GETVERSION _IOR('f', 3, long) | |
622 | #define EXT4_IOC_SETVERSION _IOW('f', 4, long) | |
617ba13b MC |
623 | #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION |
624 | #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION | |
617ba13b MC |
625 | #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long) |
626 | #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long) | |
8eea80d5 TT |
627 | #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long) |
628 | #define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input) | |
629 | #define EXT4_IOC_MIGRATE _IO('f', 9) | |
ccd2506b | 630 | /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */ |
8eea80d5 | 631 | /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */ |
ccd2506b | 632 | #define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12) |
748de673 | 633 | #define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent) |
19c5246d | 634 | #define EXT4_IOC_RESIZE_FS _IOW('f', 16, __u64) |
393d1d1d | 635 | #define EXT4_IOC_SWAP_BOOT _IO('f', 17) |
7869a4a6 | 636 | #define EXT4_IOC_PRECACHE_EXTENTS _IO('f', 18) |
9bd8212f MH |
637 | #define EXT4_IOC_SET_ENCRYPTION_POLICY _IOR('f', 19, struct ext4_encryption_policy) |
638 | #define EXT4_IOC_GET_ENCRYPTION_PWSALT _IOW('f', 20, __u8[16]) | |
639 | #define EXT4_IOC_GET_ENCRYPTION_POLICY _IOW('f', 21, struct ext4_encryption_policy) | |
ac27a0ec | 640 | |
9b7365fc LX |
641 | #ifndef FS_IOC_FSGETXATTR |
642 | /* Until the uapi changes get merged for project quota... */ | |
643 | ||
644 | #define FS_IOC_FSGETXATTR _IOR('X', 31, struct fsxattr) | |
645 | #define FS_IOC_FSSETXATTR _IOW('X', 32, struct fsxattr) | |
646 | ||
647 | /* | |
648 | * Structure for FS_IOC_FSGETXATTR and FS_IOC_FSSETXATTR. | |
649 | */ | |
650 | struct fsxattr { | |
651 | __u32 fsx_xflags; /* xflags field value (get/set) */ | |
652 | __u32 fsx_extsize; /* extsize field value (get/set)*/ | |
653 | __u32 fsx_nextents; /* nextents field value (get) */ | |
654 | __u32 fsx_projid; /* project identifier (get/set) */ | |
655 | unsigned char fsx_pad[12]; | |
656 | }; | |
657 | ||
658 | /* | |
659 | * Flags for the fsx_xflags field | |
660 | */ | |
661 | #define FS_XFLAG_REALTIME 0x00000001 /* data in realtime volume */ | |
662 | #define FS_XFLAG_PREALLOC 0x00000002 /* preallocated file extents */ | |
663 | #define FS_XFLAG_IMMUTABLE 0x00000008 /* file cannot be modified */ | |
664 | #define FS_XFLAG_APPEND 0x00000010 /* all writes append */ | |
665 | #define FS_XFLAG_SYNC 0x00000020 /* all writes synchronous */ | |
666 | #define FS_XFLAG_NOATIME 0x00000040 /* do not update access time */ | |
667 | #define FS_XFLAG_NODUMP 0x00000080 /* do not include in backups */ | |
668 | #define FS_XFLAG_RTINHERIT 0x00000100 /* create with rt bit set */ | |
669 | #define FS_XFLAG_PROJINHERIT 0x00000200 /* create with parents projid */ | |
670 | #define FS_XFLAG_NOSYMLINKS 0x00000400 /* disallow symlink creation */ | |
671 | #define FS_XFLAG_EXTSIZE 0x00000800 /* extent size allocator hint */ | |
672 | #define FS_XFLAG_EXTSZINHERIT 0x00001000 /* inherit inode extent size */ | |
673 | #define FS_XFLAG_NODEFRAG 0x00002000 /* do not defragment */ | |
674 | #define FS_XFLAG_FILESTREAM 0x00004000 /* use filestream allocator */ | |
675 | #define FS_XFLAG_HASATTR 0x80000000 /* no DIFLAG for this */ | |
676 | #endif /* !defined(FS_IOC_FSGETXATTR) */ | |
677 | ||
678 | #define EXT4_IOC_FSGETXATTR FS_IOC_FSGETXATTR | |
679 | #define EXT4_IOC_FSSETXATTR FS_IOC_FSSETXATTR | |
680 | ||
899ad0ce | 681 | #if defined(__KERNEL__) && defined(CONFIG_COMPAT) |
ac27a0ec DK |
682 | /* |
683 | * ioctl commands in 32 bit emulation | |
684 | */ | |
617ba13b MC |
685 | #define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS |
686 | #define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS | |
687 | #define EXT4_IOC32_GETVERSION _IOR('f', 3, int) | |
688 | #define EXT4_IOC32_SETVERSION _IOW('f', 4, int) | |
689 | #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int) | |
690 | #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int) | |
691 | #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int) | |
4d92dc0f | 692 | #define EXT4_IOC32_GROUP_ADD _IOW('f', 8, struct compat_ext4_new_group_input) |
617ba13b MC |
693 | #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION |
694 | #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION | |
899ad0ce | 695 | #endif |
ac27a0ec | 696 | |
b595076a | 697 | /* Max physical block we can address w/o extents */ |
fb0a387d ES |
698 | #define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF |
699 | ||
ac27a0ec DK |
700 | /* |
701 | * Structure of an inode on the disk | |
702 | */ | |
617ba13b | 703 | struct ext4_inode { |
ac27a0ec DK |
704 | __le16 i_mode; /* File mode */ |
705 | __le16 i_uid; /* Low 16 bits of Owner Uid */ | |
a48380f7 | 706 | __le32 i_size_lo; /* Size in bytes */ |
ac27a0ec | 707 | __le32 i_atime; /* Access time */ |
ef7f3835 | 708 | __le32 i_ctime; /* Inode Change time */ |
ac27a0ec DK |
709 | __le32 i_mtime; /* Modification time */ |
710 | __le32 i_dtime; /* Deletion Time */ | |
711 | __le16 i_gid; /* Low 16 bits of Group Id */ | |
712 | __le16 i_links_count; /* Links count */ | |
0fc1b451 | 713 | __le32 i_blocks_lo; /* Blocks count */ |
ac27a0ec DK |
714 | __le32 i_flags; /* File flags */ |
715 | union { | |
716 | struct { | |
25ec56b5 | 717 | __le32 l_i_version; |
ac27a0ec DK |
718 | } linux1; |
719 | struct { | |
720 | __u32 h_i_translator; | |
721 | } hurd1; | |
722 | struct { | |
723 | __u32 m_i_reserved1; | |
724 | } masix1; | |
725 | } osd1; /* OS dependent 1 */ | |
617ba13b | 726 | __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */ |
ac27a0ec | 727 | __le32 i_generation; /* File version (for NFS) */ |
7973c0c1 | 728 | __le32 i_file_acl_lo; /* File ACL */ |
a48380f7 | 729 | __le32 i_size_high; |
f077d0d7 | 730 | __le32 i_obso_faddr; /* Obsoleted fragment address */ |
ac27a0ec DK |
731 | union { |
732 | struct { | |
0fc1b451 | 733 | __le16 l_i_blocks_high; /* were l_i_reserved1 */ |
a1ddeb7e | 734 | __le16 l_i_file_acl_high; |
8c55e204 | 735 | __le16 l_i_uid_high; /* these 2 fields */ |
ac27a0ec | 736 | __le16 l_i_gid_high; /* were reserved2[0] */ |
e6153918 DW |
737 | __le16 l_i_checksum_lo;/* crc32c(uuid+inum+inode) LE */ |
738 | __le16 l_i_reserved; | |
ac27a0ec DK |
739 | } linux2; |
740 | struct { | |
f077d0d7 | 741 | __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ |
ac27a0ec DK |
742 | __u16 h_i_mode_high; |
743 | __u16 h_i_uid_high; | |
744 | __u16 h_i_gid_high; | |
745 | __u32 h_i_author; | |
746 | } hurd2; | |
747 | struct { | |
f077d0d7 | 748 | __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ |
a1ddeb7e | 749 | __le16 m_i_file_acl_high; |
ac27a0ec DK |
750 | __u32 m_i_reserved2[2]; |
751 | } masix2; | |
752 | } osd2; /* OS dependent 2 */ | |
753 | __le16 i_extra_isize; | |
e6153918 | 754 | __le16 i_checksum_hi; /* crc32c(uuid+inum+inode) BE */ |
ef7f3835 KS |
755 | __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */ |
756 | __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */ | |
757 | __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */ | |
758 | __le32 i_crtime; /* File Creation time */ | |
759 | __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */ | |
25ec56b5 | 760 | __le32 i_version_hi; /* high 32 bits for 64-bit version */ |
8b4953e1 | 761 | __le32 i_projid; /* Project ID */ |
ac27a0ec DK |
762 | }; |
763 | ||
748de673 AF |
764 | struct move_extent { |
765 | __u32 reserved; /* should be zero */ | |
766 | __u32 donor_fd; /* donor file descriptor */ | |
767 | __u64 orig_start; /* logical start offset in block for orig */ | |
768 | __u64 donor_start; /* logical start offset in block for donor */ | |
769 | __u64 len; /* block length to be moved */ | |
770 | __u64 moved_len; /* moved block length */ | |
771 | }; | |
ac27a0ec | 772 | |
ef7f3835 KS |
773 | #define EXT4_EPOCH_BITS 2 |
774 | #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1) | |
775 | #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS) | |
776 | ||
777 | /* | |
778 | * Extended fields will fit into an inode if the filesystem was formatted | |
779 | * with large inodes (-I 256 or larger) and there are not currently any EAs | |
780 | * consuming all of the available space. For new inodes we always reserve | |
781 | * enough space for the kernel's known extended fields, but for inodes | |
782 | * created with an old kernel this might not have been the case. None of | |
783 | * the extended inode fields is critical for correct filesystem operation. | |
784 | * This macro checks if a certain field fits in the inode. Note that | |
785 | * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize | |
786 | */ | |
787 | #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \ | |
788 | ((offsetof(typeof(*ext4_inode), field) + \ | |
789 | sizeof((ext4_inode)->field)) \ | |
790 | <= (EXT4_GOOD_OLD_INODE_SIZE + \ | |
791 | (einode)->i_extra_isize)) \ | |
792 | ||
a4dad1ae DT |
793 | /* |
794 | * We use an encoding that preserves the times for extra epoch "00": | |
795 | * | |
796 | * extra msb of adjust for signed | |
797 | * epoch 32-bit 32-bit tv_sec to | |
798 | * bits time decoded 64-bit tv_sec 64-bit tv_sec valid time range | |
799 | * 0 0 1 -0x80000000..-0x00000001 0x000000000 1901-12-13..1969-12-31 | |
800 | * 0 0 0 0x000000000..0x07fffffff 0x000000000 1970-01-01..2038-01-19 | |
801 | * 0 1 1 0x080000000..0x0ffffffff 0x100000000 2038-01-19..2106-02-07 | |
802 | * 0 1 0 0x100000000..0x17fffffff 0x100000000 2106-02-07..2174-02-25 | |
803 | * 1 0 1 0x180000000..0x1ffffffff 0x200000000 2174-02-25..2242-03-16 | |
804 | * 1 0 0 0x200000000..0x27fffffff 0x200000000 2242-03-16..2310-04-04 | |
805 | * 1 1 1 0x280000000..0x2ffffffff 0x300000000 2310-04-04..2378-04-22 | |
806 | * 1 1 0 0x300000000..0x37fffffff 0x300000000 2378-04-22..2446-05-10 | |
807 | * | |
808 | * Note that previous versions of the kernel on 64-bit systems would | |
809 | * incorrectly use extra epoch bits 1,1 for dates between 1901 and | |
810 | * 1970. e2fsck will correct this, assuming that it is run on the | |
811 | * affected filesystem before 2242. | |
812 | */ | |
813 | ||
ef7f3835 KS |
814 | static inline __le32 ext4_encode_extra_time(struct timespec *time) |
815 | { | |
a4dad1ae DT |
816 | u32 extra = sizeof(time->tv_sec) > 4 ? |
817 | ((time->tv_sec - (s32)time->tv_sec) >> 32) & EXT4_EPOCH_MASK : 0; | |
818 | return cpu_to_le32(extra | (time->tv_nsec << EXT4_EPOCH_BITS)); | |
ef7f3835 KS |
819 | } |
820 | ||
821 | static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra) | |
822 | { | |
a4dad1ae DT |
823 | if (unlikely(sizeof(time->tv_sec) > 4 && |
824 | (extra & cpu_to_le32(EXT4_EPOCH_MASK)))) { | |
825 | #if LINUX_VERSION_CODE < KERNEL_VERSION(4,20,0) | |
826 | /* Handle legacy encoding of pre-1970 dates with epoch | |
827 | * bits 1,1. We assume that by kernel version 4.20, | |
828 | * everyone will have run fsck over the affected | |
829 | * filesystems to correct the problem. (This | |
830 | * backwards compatibility may be removed before this | |
831 | * time, at the discretion of the ext4 developers.) | |
832 | */ | |
833 | u64 extra_bits = le32_to_cpu(extra) & EXT4_EPOCH_MASK; | |
834 | if (extra_bits == 3 && ((time->tv_sec) & 0x80000000) != 0) | |
835 | extra_bits = 0; | |
836 | time->tv_sec += extra_bits << 32; | |
837 | #else | |
838 | time->tv_sec += (u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) << 32; | |
839 | #endif | |
840 | } | |
841 | time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS; | |
ef7f3835 KS |
842 | } |
843 | ||
844 | #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \ | |
845 | do { \ | |
846 | (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \ | |
847 | if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \ | |
848 | (raw_inode)->xtime ## _extra = \ | |
849 | ext4_encode_extra_time(&(inode)->xtime); \ | |
850 | } while (0) | |
851 | ||
852 | #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \ | |
853 | do { \ | |
854 | if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ | |
855 | (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \ | |
856 | if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ | |
857 | (raw_inode)->xtime ## _extra = \ | |
858 | ext4_encode_extra_time(&(einode)->xtime); \ | |
859 | } while (0) | |
860 | ||
861 | #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \ | |
862 | do { \ | |
863 | (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \ | |
864 | if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \ | |
865 | ext4_decode_extra_time(&(inode)->xtime, \ | |
866 | raw_inode->xtime ## _extra); \ | |
af0b44a1 ES |
867 | else \ |
868 | (inode)->xtime.tv_nsec = 0; \ | |
ef7f3835 KS |
869 | } while (0) |
870 | ||
871 | #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \ | |
872 | do { \ | |
873 | if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ | |
874 | (einode)->xtime.tv_sec = \ | |
875 | (signed)le32_to_cpu((raw_inode)->xtime); \ | |
19ea8060 TT |
876 | else \ |
877 | (einode)->xtime.tv_sec = 0; \ | |
ef7f3835 KS |
878 | if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ |
879 | ext4_decode_extra_time(&(einode)->xtime, \ | |
880 | raw_inode->xtime ## _extra); \ | |
af0b44a1 ES |
881 | else \ |
882 | (einode)->xtime.tv_nsec = 0; \ | |
ef7f3835 KS |
883 | } while (0) |
884 | ||
25ec56b5 JNC |
885 | #define i_disk_version osd1.linux1.l_i_version |
886 | ||
ac27a0ec DK |
887 | #if defined(__KERNEL__) || defined(__linux__) |
888 | #define i_reserved1 osd1.linux1.l_i_reserved1 | |
a1ddeb7e | 889 | #define i_file_acl_high osd2.linux2.l_i_file_acl_high |
0fc1b451 | 890 | #define i_blocks_high osd2.linux2.l_i_blocks_high |
ac27a0ec DK |
891 | #define i_uid_low i_uid |
892 | #define i_gid_low i_gid | |
893 | #define i_uid_high osd2.linux2.l_i_uid_high | |
894 | #define i_gid_high osd2.linux2.l_i_gid_high | |
e6153918 | 895 | #define i_checksum_lo osd2.linux2.l_i_checksum_lo |
ac27a0ec DK |
896 | |
897 | #elif defined(__GNU__) | |
898 | ||
899 | #define i_translator osd1.hurd1.h_i_translator | |
ac27a0ec DK |
900 | #define i_uid_high osd2.hurd2.h_i_uid_high |
901 | #define i_gid_high osd2.hurd2.h_i_gid_high | |
902 | #define i_author osd2.hurd2.h_i_author | |
903 | ||
904 | #elif defined(__masix__) | |
905 | ||
906 | #define i_reserved1 osd1.masix1.m_i_reserved1 | |
a1ddeb7e | 907 | #define i_file_acl_high osd2.masix2.m_i_file_acl_high |
ac27a0ec DK |
908 | #define i_reserved2 osd2.masix2.m_i_reserved2 |
909 | ||
910 | #endif /* defined(__KERNEL__) || defined(__linux__) */ | |
911 | ||
c0677e6d ZL |
912 | #include "extents_status.h" |
913 | ||
d444c3c3 TT |
914 | /* |
915 | * fourth extended file system inode data in memory | |
916 | */ | |
917 | struct ext4_inode_info { | |
918 | __le32 i_data[15]; /* unconverted */ | |
d444c3c3 | 919 | __u32 i_dtime; |
12e9b892 | 920 | ext4_fsblk_t i_file_acl; |
d444c3c3 TT |
921 | |
922 | /* | |
923 | * i_block_group is the number of the block group which contains | |
924 | * this file's inode. Constant across the lifetime of the inode, | |
925 | * it is ued for making block allocation decisions - we try to | |
926 | * place a file's data blocks near its inode block, and new inodes | |
927 | * near to their parent directory's inode. | |
928 | */ | |
929 | ext4_group_t i_block_group; | |
8a2005d3 | 930 | ext4_lblk_t i_dir_start_lookup; |
353eb83c | 931 | #if (BITS_PER_LONG < 64) |
19f5fb7a | 932 | unsigned long i_state_flags; /* Dynamic state flags */ |
353eb83c | 933 | #endif |
12e9b892 | 934 | unsigned long i_flags; |
d444c3c3 | 935 | |
d444c3c3 TT |
936 | /* |
937 | * Extended attributes can be read independently of the main file | |
938 | * data. Taking i_mutex even when reading would cause contention | |
939 | * between readers of EAs and writers of regular file data, so | |
940 | * instead we synchronize on xattr_sem when reading or changing | |
941 | * EAs. | |
942 | */ | |
943 | struct rw_semaphore xattr_sem; | |
d444c3c3 TT |
944 | |
945 | struct list_head i_orphan; /* unlinked but open inodes */ | |
946 | ||
947 | /* | |
948 | * i_disksize keeps track of what the inode size is ON DISK, not | |
949 | * in memory. During truncate, i_size is set to the new size by | |
950 | * the VFS prior to calling ext4_truncate(), but the filesystem won't | |
951 | * set i_disksize to 0 until the truncate is actually under way. | |
952 | * | |
953 | * The intent is that i_disksize always represents the blocks which | |
954 | * are used by this file. This allows recovery to restart truncate | |
955 | * on orphans if we crash during truncate. We actually write i_disksize | |
956 | * into the on-disk inode when writing inodes out, instead of i_size. | |
957 | * | |
958 | * The only time when i_disksize and i_size may be different is when | |
959 | * a truncate is in progress. The only things which change i_disksize | |
960 | * are ext4_get_block (growth) and ext4_truncate (shrinkth). | |
961 | */ | |
962 | loff_t i_disksize; | |
963 | ||
964 | /* | |
965 | * i_data_sem is for serialising ext4_truncate() against | |
966 | * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's | |
967 | * data tree are chopped off during truncate. We can't do that in | |
968 | * ext4 because whenever we perform intermediate commits during | |
969 | * truncate, the inode and all the metadata blocks *must* be in a | |
970 | * consistent state which allows truncation of the orphans to restart | |
971 | * during recovery. Hence we must fix the get_block-vs-truncate race | |
972 | * by other means, so we have i_data_sem. | |
973 | */ | |
974 | struct rw_semaphore i_data_sem; | |
ea3d7209 JK |
975 | /* |
976 | * i_mmap_sem is for serializing page faults with truncate / punch hole | |
977 | * operations. We have to make sure that new page cannot be faulted in | |
978 | * a section of the inode that is being punched. We cannot easily use | |
979 | * i_data_sem for this since we need protection for the whole punch | |
980 | * operation and i_data_sem ranks below transaction start so we have | |
981 | * to occasionally drop it. | |
982 | */ | |
983 | struct rw_semaphore i_mmap_sem; | |
d444c3c3 | 984 | struct inode vfs_inode; |
8aefcd55 | 985 | struct jbd2_inode *jinode; |
d444c3c3 | 986 | |
202ee5df TT |
987 | spinlock_t i_raw_lock; /* protects updates to the raw inode */ |
988 | ||
d444c3c3 TT |
989 | /* |
990 | * File creation time. Its function is same as that of | |
991 | * struct timespec i_{a,c,m}time in the generic inode. | |
992 | */ | |
993 | struct timespec i_crtime; | |
994 | ||
995 | /* mballoc */ | |
996 | struct list_head i_prealloc_list; | |
997 | spinlock_t i_prealloc_lock; | |
998 | ||
c0677e6d ZL |
999 | /* extents status tree */ |
1000 | struct ext4_es_tree i_es_tree; | |
1001 | rwlock_t i_es_lock; | |
edaa53ca | 1002 | struct list_head i_es_list; |
eb68d0e2 | 1003 | unsigned int i_es_all_nr; /* protected by i_es_lock */ |
edaa53ca | 1004 | unsigned int i_es_shk_nr; /* protected by i_es_lock */ |
dd475925 JK |
1005 | ext4_lblk_t i_es_shrink_lblk; /* Offset where we start searching for |
1006 | extents to shrink. Protected by | |
1007 | i_es_lock */ | |
c0677e6d | 1008 | |
d444c3c3 TT |
1009 | /* ialloc */ |
1010 | ext4_group_t i_last_alloc_group; | |
1011 | ||
1012 | /* allocation reservation info for delalloc */ | |
57042651 | 1013 | /* In case of bigalloc, these refer to clusters rather than blocks */ |
d444c3c3 TT |
1014 | unsigned int i_reserved_data_blocks; |
1015 | unsigned int i_reserved_meta_blocks; | |
1016 | unsigned int i_allocated_meta_blocks; | |
01f49d0b | 1017 | ext4_lblk_t i_da_metadata_calc_last_lblock; |
9d0be502 | 1018 | int i_da_metadata_calc_len; |
d444c3c3 TT |
1019 | |
1020 | /* on-disk additional length */ | |
1021 | __u16 i_extra_isize; | |
1022 | ||
67cf5b09 TM |
1023 | /* Indicate the inline data space. */ |
1024 | u16 i_inline_off; | |
1025 | u16 i_inline_size; | |
1026 | ||
a9e7f447 DM |
1027 | #ifdef CONFIG_QUOTA |
1028 | /* quota space reservation, managed internally by quota code */ | |
1029 | qsize_t i_reserved_quota; | |
1030 | #endif | |
8d5d02e6 | 1031 | |
2e8fa54e | 1032 | /* Lock protecting lists below */ |
744692dc | 1033 | spinlock_t i_completed_io_lock; |
2e8fa54e JK |
1034 | /* |
1035 | * Completed IOs that need unwritten extents handling and have | |
1036 | * transaction reserved | |
1037 | */ | |
1038 | struct list_head i_rsv_conversion_list; | |
2e8fa54e | 1039 | struct work_struct i_rsv_conversion_work; |
600be30a | 1040 | atomic_t i_unwritten; /* Nr. of inflight conversions pending */ |
8a2005d3 TT |
1041 | |
1042 | spinlock_t i_block_reservation_lock; | |
b436b9be JK |
1043 | |
1044 | /* | |
1045 | * Transactions that contain inode's metadata needed to complete | |
1046 | * fsync and fdatasync, respectively. | |
1047 | */ | |
1048 | tid_t i_sync_tid; | |
1049 | tid_t i_datasync_tid; | |
814525f4 | 1050 | |
96c7e0d9 JK |
1051 | #ifdef CONFIG_QUOTA |
1052 | struct dquot *i_dquot[MAXQUOTAS]; | |
1053 | #endif | |
1054 | ||
814525f4 DW |
1055 | /* Precomputed uuid+inum+igen checksum for seeding inode checksums */ |
1056 | __u32 i_csum_seed; | |
b30ab0e0 MH |
1057 | |
1058 | #ifdef CONFIG_EXT4_FS_ENCRYPTION | |
1059 | /* Encryption params */ | |
b7236e21 | 1060 | struct ext4_crypt_info *i_crypt_info; |
b30ab0e0 | 1061 | #endif |
040cb378 | 1062 | kprojid_t i_projid; |
d444c3c3 TT |
1063 | }; |
1064 | ||
ac27a0ec DK |
1065 | /* |
1066 | * File system states | |
1067 | */ | |
617ba13b MC |
1068 | #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */ |
1069 | #define EXT4_ERROR_FS 0x0002 /* Errors detected */ | |
1070 | #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */ | |
ac27a0ec | 1071 | |
469108ff TT |
1072 | /* |
1073 | * Misc. filesystem flags | |
1074 | */ | |
1075 | #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */ | |
1076 | #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */ | |
1077 | #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */ | |
1078 | ||
ac27a0ec | 1079 | /* |
68911009 | 1080 | * Mount flags set via mount options or defaults |
ac27a0ec | 1081 | */ |
617ba13b MC |
1082 | #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */ |
1083 | #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */ | |
1084 | #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */ | |
1085 | #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */ | |
1086 | #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */ | |
39ef17f1 | 1087 | #define EXT4_MOUNT_ERRORS_MASK 0x00070 |
617ba13b MC |
1088 | #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */ |
1089 | #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/ | |
923ae0ff RZ |
1090 | #ifdef CONFIG_FS_DAX |
1091 | #define EXT4_MOUNT_DAX 0x00200 /* Direct Access */ | |
1092 | #else | |
1093 | #define EXT4_MOUNT_DAX 0 | |
1094 | #endif | |
617ba13b MC |
1095 | #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */ |
1096 | #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */ | |
1097 | #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */ | |
1098 | #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */ | |
1099 | #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */ | |
1100 | #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */ | |
1101 | #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */ | |
1102 | #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */ | |
afd4672d | 1103 | #define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */ |
617ba13b | 1104 | #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */ |
617ba13b MC |
1105 | #define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */ |
1106 | #define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */ | |
1107 | #define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */ | |
744692dc | 1108 | #define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000 /* Enable support for dio read nolocking */ |
d4da6c9c | 1109 | #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */ |
818d276c | 1110 | #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */ |
64769240 | 1111 | #define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */ |
5bf5683a | 1112 | #define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */ |
6fd058f7 | 1113 | #define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */ |
5328e635 | 1114 | #define EXT4_MOUNT_DISCARD 0x40000000 /* Issue DISCARD requests */ |
bfff6873 | 1115 | #define EXT4_MOUNT_INIT_INODE_TABLE 0x80000000 /* Initialize uninitialized itables */ |
5bf5683a | 1116 | |
68911009 LC |
1117 | /* |
1118 | * Mount flags set either automatically (could not be set by mount option) | |
1119 | * based on per file system feature or property or in special cases such as | |
1120 | * distinguishing between explicit mount option definition and default. | |
1121 | */ | |
56889787 TT |
1122 | #define EXT4_MOUNT2_EXPLICIT_DELALLOC 0x00000001 /* User explicitly |
1123 | specified delalloc */ | |
68911009 LC |
1124 | #define EXT4_MOUNT2_STD_GROUP_SIZE 0x00000002 /* We have standard group |
1125 | size of blocksize * 8 | |
1126 | blocks */ | |
ed3654eb TT |
1127 | #define EXT4_MOUNT2_HURD_COMPAT 0x00000004 /* Support HURD-castrated |
1128 | file systems */ | |
56889787 | 1129 | |
1e381f60 DM |
1130 | #define EXT4_MOUNT2_EXPLICIT_JOURNAL_CHECKSUM 0x00000008 /* User explicitly |
1131 | specified journal checksum */ | |
1132 | ||
fd8c37ec TT |
1133 | #define clear_opt(sb, opt) EXT4_SB(sb)->s_mount_opt &= \ |
1134 | ~EXT4_MOUNT_##opt | |
1135 | #define set_opt(sb, opt) EXT4_SB(sb)->s_mount_opt |= \ | |
1136 | EXT4_MOUNT_##opt | |
617ba13b MC |
1137 | #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \ |
1138 | EXT4_MOUNT_##opt) | |
ac27a0ec | 1139 | |
a2595b8a TT |
1140 | #define clear_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 &= \ |
1141 | ~EXT4_MOUNT2_##opt | |
1142 | #define set_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 |= \ | |
1143 | EXT4_MOUNT2_##opt | |
1144 | #define test_opt2(sb, opt) (EXT4_SB(sb)->s_mount_opt2 & \ | |
1145 | EXT4_MOUNT2_##opt) | |
1146 | ||
597d508c AM |
1147 | #define ext4_test_and_set_bit __test_and_set_bit_le |
1148 | #define ext4_set_bit __set_bit_le | |
617ba13b | 1149 | #define ext4_set_bit_atomic ext2_set_bit_atomic |
597d508c AM |
1150 | #define ext4_test_and_clear_bit __test_and_clear_bit_le |
1151 | #define ext4_clear_bit __clear_bit_le | |
617ba13b | 1152 | #define ext4_clear_bit_atomic ext2_clear_bit_atomic |
50e0168c | 1153 | #define ext4_test_bit test_bit_le |
50e0168c AM |
1154 | #define ext4_find_next_zero_bit find_next_zero_bit_le |
1155 | #define ext4_find_next_bit find_next_bit_le | |
ac27a0ec | 1156 | |
c3e94d1d YY |
1157 | extern void ext4_set_bits(void *bm, int cur, int len); |
1158 | ||
ac27a0ec DK |
1159 | /* |
1160 | * Maximal mount counts between two filesystem checks | |
1161 | */ | |
617ba13b MC |
1162 | #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ |
1163 | #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */ | |
ac27a0ec DK |
1164 | |
1165 | /* | |
1166 | * Behaviour when detecting errors | |
1167 | */ | |
617ba13b MC |
1168 | #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */ |
1169 | #define EXT4_ERRORS_RO 2 /* Remount fs read-only */ | |
1170 | #define EXT4_ERRORS_PANIC 3 /* Panic */ | |
1171 | #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE | |
ac27a0ec | 1172 | |
e6153918 DW |
1173 | /* Metadata checksum algorithm codes */ |
1174 | #define EXT4_CRC32C_CHKSUM 1 | |
1175 | ||
ac27a0ec DK |
1176 | /* |
1177 | * Structure of the super block | |
1178 | */ | |
617ba13b | 1179 | struct ext4_super_block { |
ac27a0ec | 1180 | /*00*/ __le32 s_inodes_count; /* Inodes count */ |
6bc9feff | 1181 | __le32 s_blocks_count_lo; /* Blocks count */ |
308ba3ec AK |
1182 | __le32 s_r_blocks_count_lo; /* Reserved blocks count */ |
1183 | __le32 s_free_blocks_count_lo; /* Free blocks count */ | |
ac27a0ec DK |
1184 | /*10*/ __le32 s_free_inodes_count; /* Free inodes count */ |
1185 | __le32 s_first_data_block; /* First Data Block */ | |
1186 | __le32 s_log_block_size; /* Block size */ | |
281b5995 | 1187 | __le32 s_log_cluster_size; /* Allocation cluster size */ |
ac27a0ec | 1188 | /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */ |
281b5995 | 1189 | __le32 s_clusters_per_group; /* # Clusters per group */ |
ac27a0ec DK |
1190 | __le32 s_inodes_per_group; /* # Inodes per group */ |
1191 | __le32 s_mtime; /* Mount time */ | |
1192 | /*30*/ __le32 s_wtime; /* Write time */ | |
1193 | __le16 s_mnt_count; /* Mount count */ | |
1194 | __le16 s_max_mnt_count; /* Maximal mount count */ | |
1195 | __le16 s_magic; /* Magic signature */ | |
1196 | __le16 s_state; /* File system state */ | |
1197 | __le16 s_errors; /* Behaviour when detecting errors */ | |
1198 | __le16 s_minor_rev_level; /* minor revision level */ | |
1199 | /*40*/ __le32 s_lastcheck; /* time of last check */ | |
1200 | __le32 s_checkinterval; /* max. time between checks */ | |
1201 | __le32 s_creator_os; /* OS */ | |
1202 | __le32 s_rev_level; /* Revision level */ | |
1203 | /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */ | |
1204 | __le16 s_def_resgid; /* Default gid for reserved blocks */ | |
1205 | /* | |
617ba13b | 1206 | * These fields are for EXT4_DYNAMIC_REV superblocks only. |
ac27a0ec DK |
1207 | * |
1208 | * Note: the difference between the compatible feature set and | |
1209 | * the incompatible feature set is that if there is a bit set | |
1210 | * in the incompatible feature set that the kernel doesn't | |
1211 | * know about, it should refuse to mount the filesystem. | |
1212 | * | |
1213 | * e2fsck's requirements are more strict; if it doesn't know | |
1214 | * about a feature in either the compatible or incompatible | |
1215 | * feature set, it must abort and not try to meddle with | |
1216 | * things it doesn't understand... | |
1217 | */ | |
1218 | __le32 s_first_ino; /* First non-reserved inode */ | |
0d1ee42f | 1219 | __le16 s_inode_size; /* size of inode structure */ |
ac27a0ec DK |
1220 | __le16 s_block_group_nr; /* block group # of this superblock */ |
1221 | __le32 s_feature_compat; /* compatible feature set */ | |
1222 | /*60*/ __le32 s_feature_incompat; /* incompatible feature set */ | |
1223 | __le32 s_feature_ro_compat; /* readonly-compatible feature set */ | |
1224 | /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */ | |
1225 | /*78*/ char s_volume_name[16]; /* volume name */ | |
1226 | /*88*/ char s_last_mounted[64]; /* directory where last mounted */ | |
1227 | /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */ | |
1228 | /* | |
1229 | * Performance hints. Directory preallocation should only | |
617ba13b | 1230 | * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on. |
ac27a0ec DK |
1231 | */ |
1232 | __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ | |
1233 | __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ | |
1234 | __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */ | |
1235 | /* | |
617ba13b | 1236 | * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set. |
ac27a0ec DK |
1237 | */ |
1238 | /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */ | |
1239 | /*E0*/ __le32 s_journal_inum; /* inode number of journal file */ | |
1240 | __le32 s_journal_dev; /* device number of journal file */ | |
1241 | __le32 s_last_orphan; /* start of list of inodes to delete */ | |
1242 | __le32 s_hash_seed[4]; /* HTREE hash seed */ | |
1243 | __u8 s_def_hash_version; /* Default hash version to use */ | |
89eeddf0 | 1244 | __u8 s_jnl_backup_type; |
0d1ee42f | 1245 | __le16 s_desc_size; /* size of group descriptor */ |
bd81d8ee | 1246 | /*100*/ __le32 s_default_mount_opts; |
ac27a0ec | 1247 | __le32 s_first_meta_bg; /* First metablock block group */ |
bd81d8ee LV |
1248 | __le32 s_mkfs_time; /* When the filesystem was created */ |
1249 | __le32 s_jnl_blocks[17]; /* Backup of the journal inode */ | |
1250 | /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */ | |
1251 | /*150*/ __le32 s_blocks_count_hi; /* Blocks count */ | |
1252 | __le32 s_r_blocks_count_hi; /* Reserved blocks count */ | |
1253 | __le32 s_free_blocks_count_hi; /* Free blocks count */ | |
c1bddad9 AK |
1254 | __le16 s_min_extra_isize; /* All inodes have at least # bytes */ |
1255 | __le16 s_want_extra_isize; /* New inodes should reserve # bytes */ | |
1256 | __le32 s_flags; /* Miscellaneous flags */ | |
1257 | __le16 s_raid_stride; /* RAID stride */ | |
c5e06d10 | 1258 | __le16 s_mmp_update_interval; /* # seconds to wait in MMP checking */ |
c1bddad9 AK |
1259 | __le64 s_mmp_block; /* Block for multi-mount protection */ |
1260 | __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/ | |
772cb7c8 | 1261 | __u8 s_log_groups_per_flex; /* FLEX_BG group size */ |
e6153918 | 1262 | __u8 s_checksum_type; /* metadata checksum algorithm used */ |
f542fbe8 TT |
1263 | __u8 s_encryption_level; /* versioning level for encryption */ |
1264 | __u8 s_reserved_pad; /* Padding to next 32bits */ | |
afc32f7e | 1265 | __le64 s_kbytes_written; /* nr of lifetime kilobytes written */ |
4a9cdec7 TT |
1266 | __le32 s_snapshot_inum; /* Inode number of active snapshot */ |
1267 | __le32 s_snapshot_id; /* sequential ID of active snapshot */ | |
1268 | __le64 s_snapshot_r_blocks_count; /* reserved blocks for active | |
1269 | snapshot's future use */ | |
1270 | __le32 s_snapshot_list; /* inode number of the head of the | |
1271 | on-disk snapshot list */ | |
1c13d5c0 TT |
1272 | #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count) |
1273 | __le32 s_error_count; /* number of fs errors */ | |
1274 | __le32 s_first_error_time; /* first time an error happened */ | |
1275 | __le32 s_first_error_ino; /* inode involved in first error */ | |
1276 | __le64 s_first_error_block; /* block involved of first error */ | |
1277 | __u8 s_first_error_func[32]; /* function where the error happened */ | |
1278 | __le32 s_first_error_line; /* line number where error happened */ | |
1279 | __le32 s_last_error_time; /* most recent time of an error */ | |
1280 | __le32 s_last_error_ino; /* inode involved in last error */ | |
1281 | __le32 s_last_error_line; /* line number where error happened */ | |
1282 | __le64 s_last_error_block; /* block involved of last error */ | |
1283 | __u8 s_last_error_func[32]; /* function where the error happened */ | |
8b67f04a TT |
1284 | #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts) |
1285 | __u8 s_mount_opts[64]; | |
281b5995 TT |
1286 | __le32 s_usr_quota_inum; /* inode for tracking user quota */ |
1287 | __le32 s_grp_quota_inum; /* inode for tracking group quota */ | |
1288 | __le32 s_overhead_clusters; /* overhead blocks/clusters in fs */ | |
1beeef1b | 1289 | __le32 s_backup_bgs[2]; /* groups with sparse_super2 SBs */ |
3edc18d8 | 1290 | __u8 s_encrypt_algos[4]; /* Encryption algorithms in use */ |
f542fbe8 TT |
1291 | __u8 s_encrypt_pw_salt[16]; /* Salt used for string2key algorithm */ |
1292 | __le32 s_lpf_ino; /* Location of the lost+found inode */ | |
8b4953e1 | 1293 | __le32 s_prj_quota_inum; /* inode for tracking project quota */ |
8c81bd8f DW |
1294 | __le32 s_checksum_seed; /* crc32c(uuid) if csum_seed set */ |
1295 | __le32 s_reserved[98]; /* Padding to the end of the block */ | |
e6153918 | 1296 | __le32 s_checksum; /* crc32c(superblock) */ |
ac27a0ec DK |
1297 | }; |
1298 | ||
1c13d5c0 TT |
1299 | #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START) |
1300 | ||
ac27a0ec | 1301 | #ifdef __KERNEL__ |
bc0b0d6d TT |
1302 | |
1303 | /* | |
4ab2f15b | 1304 | * run-time mount flags |
bc0b0d6d | 1305 | */ |
6ddb2447 TT |
1306 | #define EXT4_MF_MNTDIR_SAMPLED 0x0001 |
1307 | #define EXT4_MF_FS_ABORTED 0x0002 /* Fatal error detected */ | |
1308 | #define EXT4_MF_TEST_DUMMY_ENCRYPTION 0x0004 | |
1309 | ||
1310 | #ifdef CONFIG_EXT4_FS_ENCRYPTION | |
1311 | #define DUMMY_ENCRYPTION_ENABLED(sbi) (unlikely((sbi)->s_mount_flags & \ | |
1312 | EXT4_MF_TEST_DUMMY_ENCRYPTION)) | |
1313 | #else | |
1314 | #define DUMMY_ENCRYPTION_ENABLED(sbi) (0) | |
1315 | #endif | |
bc0b0d6d | 1316 | |
a2d4a646 | 1317 | /* Number of quota types we support */ |
689c958c | 1318 | #define EXT4_MAXQUOTAS 3 |
a2d4a646 | 1319 | |
ca0faba0 TT |
1320 | /* |
1321 | * fourth extended-fs super-block data in memory | |
1322 | */ | |
1323 | struct ext4_sb_info { | |
1324 | unsigned long s_desc_size; /* Size of a group descriptor in bytes */ | |
1325 | unsigned long s_inodes_per_block;/* Number of inodes per block */ | |
1326 | unsigned long s_blocks_per_group;/* Number of blocks in a group */ | |
281b5995 | 1327 | unsigned long s_clusters_per_group; /* Number of clusters in a group */ |
ca0faba0 TT |
1328 | unsigned long s_inodes_per_group;/* Number of inodes in a group */ |
1329 | unsigned long s_itb_per_group; /* Number of inode table blocks per group */ | |
1330 | unsigned long s_gdb_count; /* Number of group descriptor blocks */ | |
1331 | unsigned long s_desc_per_block; /* Number of group descriptors per block */ | |
1332 | ext4_group_t s_groups_count; /* Number of groups in the fs */ | |
fb0a387d | 1333 | ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */ |
952fc18e | 1334 | unsigned long s_overhead; /* # of fs overhead clusters */ |
281b5995 TT |
1335 | unsigned int s_cluster_ratio; /* Number of blocks per cluster */ |
1336 | unsigned int s_cluster_bits; /* log2 of s_cluster_ratio */ | |
ca0faba0 TT |
1337 | loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */ |
1338 | struct buffer_head * s_sbh; /* Buffer containing the super block */ | |
1339 | struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */ | |
1340 | struct buffer_head **s_group_desc; | |
7f4520cc | 1341 | unsigned int s_mount_opt; |
a2595b8a | 1342 | unsigned int s_mount_opt2; |
bc0b0d6d | 1343 | unsigned int s_mount_flags; |
5a916be1 | 1344 | unsigned int s_def_mount_opt; |
ca0faba0 | 1345 | ext4_fsblk_t s_sb_block; |
27dd4385 | 1346 | atomic64_t s_resv_clusters; |
08cefc7a EB |
1347 | kuid_t s_resuid; |
1348 | kgid_t s_resgid; | |
ca0faba0 TT |
1349 | unsigned short s_mount_state; |
1350 | unsigned short s_pad; | |
1351 | int s_addr_per_block_bits; | |
1352 | int s_desc_per_block_bits; | |
1353 | int s_inode_size; | |
1354 | int s_first_ino; | |
1355 | unsigned int s_inode_readahead_blks; | |
11013911 | 1356 | unsigned int s_inode_goal; |
ca0faba0 TT |
1357 | spinlock_t s_next_gen_lock; |
1358 | u32 s_next_generation; | |
1359 | u32 s_hash_seed[4]; | |
1360 | int s_def_hash_version; | |
1361 | int s_hash_unsigned; /* 3 if hash should be signed, 0 if not */ | |
57042651 | 1362 | struct percpu_counter s_freeclusters_counter; |
ca0faba0 TT |
1363 | struct percpu_counter s_freeinodes_counter; |
1364 | struct percpu_counter s_dirs_counter; | |
57042651 | 1365 | struct percpu_counter s_dirtyclusters_counter; |
ca0faba0 TT |
1366 | struct blockgroup_lock *s_blockgroup_lock; |
1367 | struct proc_dir_entry *s_proc; | |
1368 | struct kobject s_kobj; | |
1369 | struct completion s_kobj_unregister; | |
2c0544b2 | 1370 | struct super_block *s_sb; |
ca0faba0 TT |
1371 | |
1372 | /* Journaling */ | |
ca0faba0 TT |
1373 | struct journal_s *s_journal; |
1374 | struct list_head s_orphan; | |
1375 | struct mutex s_orphan_lock; | |
8f82f840 YY |
1376 | unsigned long s_resize_flags; /* Flags indicating if there |
1377 | is a resizer */ | |
ca0faba0 TT |
1378 | unsigned long s_commit_interval; |
1379 | u32 s_max_batch_time; | |
1380 | u32 s_min_batch_time; | |
1381 | struct block_device *journal_bdev; | |
ca0faba0 | 1382 | #ifdef CONFIG_QUOTA |
a2d4a646 | 1383 | char *s_qf_names[EXT4_MAXQUOTAS]; /* Names of quota files with journalled quota */ |
ca0faba0 TT |
1384 | int s_jquota_fmt; /* Format of quota to use */ |
1385 | #endif | |
1386 | unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */ | |
6fd058f7 | 1387 | struct rb_root system_blks; |
ca0faba0 TT |
1388 | |
1389 | #ifdef EXTENTS_STATS | |
1390 | /* ext4 extents stats */ | |
1391 | unsigned long s_ext_min; | |
1392 | unsigned long s_ext_max; | |
1393 | unsigned long s_depth_max; | |
1394 | spinlock_t s_ext_stats_lock; | |
1395 | unsigned long s_ext_blocks; | |
1396 | unsigned long s_ext_extents; | |
1397 | #endif | |
1398 | ||
1399 | /* for buddy allocator */ | |
1400 | struct ext4_group_info ***s_group_info; | |
1401 | struct inode *s_buddy_cache; | |
ca0faba0 | 1402 | spinlock_t s_md_lock; |
ca0faba0 TT |
1403 | unsigned short *s_mb_offsets; |
1404 | unsigned int *s_mb_maxs; | |
28623c2f | 1405 | unsigned int s_group_info_size; |
ca0faba0 TT |
1406 | |
1407 | /* tunables */ | |
1408 | unsigned long s_stripe; | |
1409 | unsigned int s_mb_stream_request; | |
1410 | unsigned int s_mb_max_to_scan; | |
1411 | unsigned int s_mb_min_to_scan; | |
1412 | unsigned int s_mb_stats; | |
1413 | unsigned int s_mb_order2_reqs; | |
1414 | unsigned int s_mb_group_prealloc; | |
df981d03 | 1415 | unsigned int s_max_dir_size_kb; |
ca0faba0 TT |
1416 | /* where last allocation was done - for stream allocation */ |
1417 | unsigned long s_mb_last_group; | |
1418 | unsigned long s_mb_last_start; | |
1419 | ||
ca0faba0 | 1420 | /* stats for buddy allocator */ |
ca0faba0 TT |
1421 | atomic_t s_bal_reqs; /* number of reqs with len > 1 */ |
1422 | atomic_t s_bal_success; /* we found long enough chunks */ | |
1423 | atomic_t s_bal_allocated; /* in blocks */ | |
1424 | atomic_t s_bal_ex_scanned; /* total extents scanned */ | |
1425 | atomic_t s_bal_goals; /* goal hits */ | |
1426 | atomic_t s_bal_breaks; /* too long searches */ | |
1427 | atomic_t s_bal_2orders; /* 2^order hits */ | |
1428 | spinlock_t s_bal_lock; | |
1429 | unsigned long s_mb_buddies_generated; | |
1430 | unsigned long long s_mb_generation_time; | |
1431 | atomic_t s_mb_lost_chunks; | |
1432 | atomic_t s_mb_preallocated; | |
1433 | atomic_t s_mb_discarded; | |
50797481 | 1434 | atomic_t s_lock_busy; |
ca0faba0 TT |
1435 | |
1436 | /* locality groups */ | |
003cb608 | 1437 | struct ext4_locality_group __percpu *s_locality_groups; |
ca0faba0 TT |
1438 | |
1439 | /* for write statistics */ | |
1440 | unsigned long s_sectors_written_start; | |
1441 | u64 s_kbytes_written; | |
1442 | ||
67a5da56 ZL |
1443 | /* the size of zero-out chunk */ |
1444 | unsigned int s_extent_max_zeroout_kb; | |
1445 | ||
ca0faba0 TT |
1446 | unsigned int s_log_groups_per_flex; |
1447 | struct flex_groups *s_flex_groups; | |
117fff10 | 1448 | ext4_group_t s_flex_groups_allocated; |
4c0425ff | 1449 | |
2e8fa54e JK |
1450 | /* workqueue for reserved extent conversions (buffered io) */ |
1451 | struct workqueue_struct *rsv_conversion_wq; | |
66e61a9e TT |
1452 | |
1453 | /* timer for periodic error stats printing */ | |
1454 | struct timer_list s_err_report; | |
bfff6873 LC |
1455 | |
1456 | /* Lazy inode table initialization info */ | |
1457 | struct ext4_li_request *s_li_request; | |
1458 | /* Wait multiplier for lazy initialization thread */ | |
1459 | unsigned int s_li_wait_mult; | |
c5e06d10 JL |
1460 | |
1461 | /* Kernel thread for multiple mount protection */ | |
1462 | struct task_struct *s_mmp_tsk; | |
3d56b8d2 TM |
1463 | |
1464 | /* record the last minlen when FITRIM is called. */ | |
1465 | atomic_t s_last_trim_minblks; | |
0441984a DW |
1466 | |
1467 | /* Reference to checksum algorithm driver via cryptoapi */ | |
1468 | struct crypto_shash *s_chksum_driver; | |
a9c47317 DW |
1469 | |
1470 | /* Precomputed FS UUID checksum for seeding other checksums */ | |
1471 | __u32 s_csum_seed; | |
74cd15cd ZL |
1472 | |
1473 | /* Reclaim extents from extent status tree */ | |
1474 | struct shrinker s_es_shrinker; | |
dd475925 | 1475 | struct list_head s_es_list; /* List of inodes with reclaimable extents */ |
edaa53ca | 1476 | long s_es_nr_inode; |
eb68d0e2 | 1477 | struct ext4_es_stats s_es_stats; |
7a2508e1 | 1478 | struct mb_cache *s_mb_cache; |
edaa53ca | 1479 | spinlock_t s_es_lock ____cacheline_aligned_in_smp; |
efbed4dc TT |
1480 | |
1481 | /* Ratelimit ext4 messages. */ | |
1482 | struct ratelimit_state s_err_ratelimit_state; | |
1483 | struct ratelimit_state s_warning_ratelimit_state; | |
1484 | struct ratelimit_state s_msg_ratelimit_state; | |
ca0faba0 TT |
1485 | }; |
1486 | ||
af5bc92d | 1487 | static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb) |
ac27a0ec DK |
1488 | { |
1489 | return sb->s_fs_info; | |
1490 | } | |
617ba13b | 1491 | static inline struct ext4_inode_info *EXT4_I(struct inode *inode) |
ac27a0ec | 1492 | { |
617ba13b | 1493 | return container_of(inode, struct ext4_inode_info, vfs_inode); |
ac27a0ec DK |
1494 | } |
1495 | ||
ef7f3835 KS |
1496 | static inline struct timespec ext4_current_time(struct inode *inode) |
1497 | { | |
1498 | return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ? | |
1499 | current_fs_time(inode->i_sb) : CURRENT_TIME_SEC; | |
1500 | } | |
1501 | ||
617ba13b | 1502 | static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino) |
ac27a0ec | 1503 | { |
617ba13b | 1504 | return ino == EXT4_ROOT_INO || |
7c319d32 AK |
1505 | ino == EXT4_USR_QUOTA_INO || |
1506 | ino == EXT4_GRP_QUOTA_INO || | |
393d1d1d | 1507 | ino == EXT4_BOOT_LOADER_INO || |
617ba13b MC |
1508 | ino == EXT4_JOURNAL_INO || |
1509 | ino == EXT4_RESIZE_INO || | |
1510 | (ino >= EXT4_FIRST_INO(sb) && | |
1511 | ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count)); | |
ac27a0ec | 1512 | } |
19f5fb7a TT |
1513 | |
1514 | /* | |
1515 | * Inode dynamic state flags | |
1516 | */ | |
1517 | enum { | |
1518 | EXT4_STATE_JDATA, /* journaled data exists */ | |
1519 | EXT4_STATE_NEW, /* inode is newly created */ | |
1520 | EXT4_STATE_XATTR, /* has in-inode xattrs */ | |
1521 | EXT4_STATE_NO_EXPAND, /* No space for expansion */ | |
1522 | EXT4_STATE_DA_ALLOC_CLOSE, /* Alloc DA blks on close */ | |
1523 | EXT4_STATE_EXT_MIGRATE, /* Inode is migrating */ | |
1524 | EXT4_STATE_DIO_UNWRITTEN, /* need convert on dio done*/ | |
14ece102 | 1525 | EXT4_STATE_NEWENTRY, /* File just added to dir */ |
17335dcc DM |
1526 | EXT4_STATE_DIOREAD_LOCK, /* Disable support for dio read |
1527 | nolocking */ | |
67cf5b09 | 1528 | EXT4_STATE_MAY_INLINE_DATA, /* may have in-inode data */ |
74d553aa | 1529 | EXT4_STATE_ORDERED_MODE, /* data=ordered mode */ |
7869a4a6 | 1530 | EXT4_STATE_EXT_PRECACHED, /* extents have been precached */ |
19f5fb7a TT |
1531 | }; |
1532 | ||
353eb83c | 1533 | #define EXT4_INODE_BIT_FNS(name, field, offset) \ |
12e9b892 DM |
1534 | static inline int ext4_test_inode_##name(struct inode *inode, int bit) \ |
1535 | { \ | |
353eb83c | 1536 | return test_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ |
12e9b892 DM |
1537 | } \ |
1538 | static inline void ext4_set_inode_##name(struct inode *inode, int bit) \ | |
1539 | { \ | |
353eb83c | 1540 | set_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ |
12e9b892 DM |
1541 | } \ |
1542 | static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \ | |
1543 | { \ | |
353eb83c | 1544 | clear_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ |
19f5fb7a TT |
1545 | } |
1546 | ||
3f61c0cc AD |
1547 | /* Add these declarations here only so that these functions can be |
1548 | * found by name. Otherwise, they are very hard to locate. */ | |
1549 | static inline int ext4_test_inode_flag(struct inode *inode, int bit); | |
1550 | static inline void ext4_set_inode_flag(struct inode *inode, int bit); | |
1551 | static inline void ext4_clear_inode_flag(struct inode *inode, int bit); | |
353eb83c | 1552 | EXT4_INODE_BIT_FNS(flag, flags, 0) |
3f61c0cc AD |
1553 | |
1554 | /* Add these declarations here only so that these functions can be | |
1555 | * found by name. Otherwise, they are very hard to locate. */ | |
1556 | static inline int ext4_test_inode_state(struct inode *inode, int bit); | |
1557 | static inline void ext4_set_inode_state(struct inode *inode, int bit); | |
1558 | static inline void ext4_clear_inode_state(struct inode *inode, int bit); | |
353eb83c TT |
1559 | #if (BITS_PER_LONG < 64) |
1560 | EXT4_INODE_BIT_FNS(state, state_flags, 0) | |
1561 | ||
1562 | static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) | |
1563 | { | |
1564 | (ei)->i_state_flags = 0; | |
1565 | } | |
1566 | #else | |
1567 | EXT4_INODE_BIT_FNS(state, flags, 32) | |
1568 | ||
1569 | static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) | |
1570 | { | |
1571 | /* We depend on the fact that callers will set i_flags */ | |
1572 | } | |
1573 | #endif | |
ac27a0ec | 1574 | #else |
617ba13b | 1575 | /* Assume that user mode programs are passing in an ext4fs superblock, not |
ac27a0ec DK |
1576 | * a kernel struct super_block. This will allow us to call the feature-test |
1577 | * macros from user land. */ | |
617ba13b | 1578 | #define EXT4_SB(sb) (sb) |
ac27a0ec DK |
1579 | #endif |
1580 | ||
b30ab0e0 MH |
1581 | /* |
1582 | * Returns true if the inode is inode is encrypted | |
1583 | */ | |
1584 | static inline int ext4_encrypted_inode(struct inode *inode) | |
1585 | { | |
1586 | #ifdef CONFIG_EXT4_FS_ENCRYPTION | |
1587 | return ext4_test_inode_flag(inode, EXT4_INODE_ENCRYPT); | |
1588 | #else | |
1589 | return 0; | |
1590 | #endif | |
1591 | } | |
1592 | ||
617ba13b | 1593 | #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime |
ac27a0ec DK |
1594 | |
1595 | /* | |
1596 | * Codes for operating systems | |
1597 | */ | |
617ba13b MC |
1598 | #define EXT4_OS_LINUX 0 |
1599 | #define EXT4_OS_HURD 1 | |
1600 | #define EXT4_OS_MASIX 2 | |
1601 | #define EXT4_OS_FREEBSD 3 | |
1602 | #define EXT4_OS_LITES 4 | |
ac27a0ec DK |
1603 | |
1604 | /* | |
1605 | * Revision levels | |
1606 | */ | |
617ba13b MC |
1607 | #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */ |
1608 | #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ | |
ac27a0ec | 1609 | |
617ba13b MC |
1610 | #define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV |
1611 | #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV | |
ac27a0ec | 1612 | |
617ba13b | 1613 | #define EXT4_GOOD_OLD_INODE_SIZE 128 |
ac27a0ec DK |
1614 | |
1615 | /* | |
1616 | * Feature set definitions | |
1617 | */ | |
1618 | ||
e2b911c5 | 1619 | /* Use the ext4_{has,set,clear}_feature_* helpers; these will be removed */ |
617ba13b | 1620 | #define EXT4_HAS_COMPAT_FEATURE(sb,mask) \ |
3a06d778 | 1621 | ((EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask)) != 0) |
617ba13b | 1622 | #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \ |
3a06d778 | 1623 | ((EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask)) != 0) |
617ba13b | 1624 | #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \ |
3a06d778 | 1625 | ((EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask)) != 0) |
617ba13b MC |
1626 | #define EXT4_SET_COMPAT_FEATURE(sb,mask) \ |
1627 | EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask) | |
1628 | #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \ | |
1629 | EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask) | |
1630 | #define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \ | |
1631 | EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask) | |
1632 | #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \ | |
1633 | EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask) | |
1634 | #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \ | |
1635 | EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask) | |
1636 | #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \ | |
1637 | EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask) | |
1638 | ||
1639 | #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001 | |
1640 | #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002 | |
1641 | #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004 | |
1642 | #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008 | |
1643 | #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010 | |
1644 | #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020 | |
1beeef1b | 1645 | #define EXT4_FEATURE_COMPAT_SPARSE_SUPER2 0x0200 |
617ba13b MC |
1646 | |
1647 | #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 | |
1648 | #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 | |
1649 | #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 | |
0fc1b451 | 1650 | #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008 |
717d50e4 | 1651 | #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010 |
f8628a14 | 1652 | #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020 |
ef7f3835 | 1653 | #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040 |
ae812306 | 1654 | #define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100 |
281b5995 | 1655 | #define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200 |
e6153918 DW |
1656 | /* |
1657 | * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM). When | |
1658 | * METADATA_CSUM is set, group descriptor checksums use the same algorithm as | |
1659 | * all other data structures' checksums. However, the METADATA_CSUM and | |
1660 | * GDT_CSUM bits are mutually exclusive. | |
1661 | */ | |
9b90e5e0 | 1662 | #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400 |
2cb5cc8b | 1663 | #define EXT4_FEATURE_RO_COMPAT_READONLY 0x1000 |
8b4953e1 | 1664 | #define EXT4_FEATURE_RO_COMPAT_PROJECT 0x2000 |
617ba13b MC |
1665 | |
1666 | #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001 | |
1667 | #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002 | |
1668 | #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */ | |
1669 | #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */ | |
1670 | #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010 | |
a86c6181 | 1671 | #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */ |
bd81d8ee | 1672 | #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080 |
0fc1b451 | 1673 | #define EXT4_FEATURE_INCOMPAT_MMP 0x0100 |
ce421581 | 1674 | #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200 |
f710b4b9 TT |
1675 | #define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 /* EA in inode */ |
1676 | #define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 /* data in dirent */ | |
8c81bd8f | 1677 | #define EXT4_FEATURE_INCOMPAT_CSUM_SEED 0x2000 |
9b90e5e0 | 1678 | #define EXT4_FEATURE_INCOMPAT_LARGEDIR 0x4000 /* >2GB or 3-lvl htree */ |
67cf5b09 | 1679 | #define EXT4_FEATURE_INCOMPAT_INLINE_DATA 0x8000 /* data in inode */ |
3edc18d8 | 1680 | #define EXT4_FEATURE_INCOMPAT_ENCRYPT 0x10000 |
617ba13b | 1681 | |
e2b911c5 DW |
1682 | #define EXT4_FEATURE_COMPAT_FUNCS(name, flagname) \ |
1683 | static inline bool ext4_has_feature_##name(struct super_block *sb) \ | |
1684 | { \ | |
1685 | return ((EXT4_SB(sb)->s_es->s_feature_compat & \ | |
1686 | cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname)) != 0); \ | |
1687 | } \ | |
1688 | static inline void ext4_set_feature_##name(struct super_block *sb) \ | |
1689 | { \ | |
1690 | EXT4_SB(sb)->s_es->s_feature_compat |= \ | |
1691 | cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \ | |
1692 | } \ | |
1693 | static inline void ext4_clear_feature_##name(struct super_block *sb) \ | |
1694 | { \ | |
1695 | EXT4_SB(sb)->s_es->s_feature_compat &= \ | |
1696 | ~cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \ | |
1697 | } | |
1698 | ||
1699 | #define EXT4_FEATURE_RO_COMPAT_FUNCS(name, flagname) \ | |
1700 | static inline bool ext4_has_feature_##name(struct super_block *sb) \ | |
1701 | { \ | |
1702 | return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \ | |
1703 | cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname)) != 0); \ | |
1704 | } \ | |
1705 | static inline void ext4_set_feature_##name(struct super_block *sb) \ | |
1706 | { \ | |
1707 | EXT4_SB(sb)->s_es->s_feature_ro_compat |= \ | |
1708 | cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \ | |
1709 | } \ | |
1710 | static inline void ext4_clear_feature_##name(struct super_block *sb) \ | |
1711 | { \ | |
1712 | EXT4_SB(sb)->s_es->s_feature_ro_compat &= \ | |
1713 | ~cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \ | |
1714 | } | |
1715 | ||
1716 | #define EXT4_FEATURE_INCOMPAT_FUNCS(name, flagname) \ | |
1717 | static inline bool ext4_has_feature_##name(struct super_block *sb) \ | |
1718 | { \ | |
1719 | return ((EXT4_SB(sb)->s_es->s_feature_incompat & \ | |
1720 | cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname)) != 0); \ | |
1721 | } \ | |
1722 | static inline void ext4_set_feature_##name(struct super_block *sb) \ | |
1723 | { \ | |
1724 | EXT4_SB(sb)->s_es->s_feature_incompat |= \ | |
1725 | cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \ | |
1726 | } \ | |
1727 | static inline void ext4_clear_feature_##name(struct super_block *sb) \ | |
1728 | { \ | |
1729 | EXT4_SB(sb)->s_es->s_feature_incompat &= \ | |
1730 | ~cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \ | |
1731 | } | |
1732 | ||
1733 | EXT4_FEATURE_COMPAT_FUNCS(dir_prealloc, DIR_PREALLOC) | |
1734 | EXT4_FEATURE_COMPAT_FUNCS(imagic_inodes, IMAGIC_INODES) | |
1735 | EXT4_FEATURE_COMPAT_FUNCS(journal, HAS_JOURNAL) | |
1736 | EXT4_FEATURE_COMPAT_FUNCS(xattr, EXT_ATTR) | |
1737 | EXT4_FEATURE_COMPAT_FUNCS(resize_inode, RESIZE_INODE) | |
1738 | EXT4_FEATURE_COMPAT_FUNCS(dir_index, DIR_INDEX) | |
1739 | EXT4_FEATURE_COMPAT_FUNCS(sparse_super2, SPARSE_SUPER2) | |
1740 | ||
1741 | EXT4_FEATURE_RO_COMPAT_FUNCS(sparse_super, SPARSE_SUPER) | |
1742 | EXT4_FEATURE_RO_COMPAT_FUNCS(large_file, LARGE_FILE) | |
1743 | EXT4_FEATURE_RO_COMPAT_FUNCS(btree_dir, BTREE_DIR) | |
1744 | EXT4_FEATURE_RO_COMPAT_FUNCS(huge_file, HUGE_FILE) | |
1745 | EXT4_FEATURE_RO_COMPAT_FUNCS(gdt_csum, GDT_CSUM) | |
1746 | EXT4_FEATURE_RO_COMPAT_FUNCS(dir_nlink, DIR_NLINK) | |
1747 | EXT4_FEATURE_RO_COMPAT_FUNCS(extra_isize, EXTRA_ISIZE) | |
1748 | EXT4_FEATURE_RO_COMPAT_FUNCS(quota, QUOTA) | |
1749 | EXT4_FEATURE_RO_COMPAT_FUNCS(bigalloc, BIGALLOC) | |
1750 | EXT4_FEATURE_RO_COMPAT_FUNCS(metadata_csum, METADATA_CSUM) | |
1751 | EXT4_FEATURE_RO_COMPAT_FUNCS(readonly, READONLY) | |
1752 | EXT4_FEATURE_RO_COMPAT_FUNCS(project, PROJECT) | |
1753 | ||
1754 | EXT4_FEATURE_INCOMPAT_FUNCS(compression, COMPRESSION) | |
1755 | EXT4_FEATURE_INCOMPAT_FUNCS(filetype, FILETYPE) | |
1756 | EXT4_FEATURE_INCOMPAT_FUNCS(journal_needs_recovery, RECOVER) | |
1757 | EXT4_FEATURE_INCOMPAT_FUNCS(journal_dev, JOURNAL_DEV) | |
1758 | EXT4_FEATURE_INCOMPAT_FUNCS(meta_bg, META_BG) | |
1759 | EXT4_FEATURE_INCOMPAT_FUNCS(extents, EXTENTS) | |
1760 | EXT4_FEATURE_INCOMPAT_FUNCS(64bit, 64BIT) | |
1761 | EXT4_FEATURE_INCOMPAT_FUNCS(mmp, MMP) | |
1762 | EXT4_FEATURE_INCOMPAT_FUNCS(flex_bg, FLEX_BG) | |
1763 | EXT4_FEATURE_INCOMPAT_FUNCS(ea_inode, EA_INODE) | |
1764 | EXT4_FEATURE_INCOMPAT_FUNCS(dirdata, DIRDATA) | |
1765 | EXT4_FEATURE_INCOMPAT_FUNCS(csum_seed, CSUM_SEED) | |
1766 | EXT4_FEATURE_INCOMPAT_FUNCS(largedir, LARGEDIR) | |
1767 | EXT4_FEATURE_INCOMPAT_FUNCS(inline_data, INLINE_DATA) | |
1768 | EXT4_FEATURE_INCOMPAT_FUNCS(encrypt, ENCRYPT) | |
1769 | ||
2035e776 TT |
1770 | #define EXT2_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR |
1771 | #define EXT2_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ | |
1772 | EXT4_FEATURE_INCOMPAT_META_BG) | |
1773 | #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ | |
1774 | EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ | |
1775 | EXT4_FEATURE_RO_COMPAT_BTREE_DIR) | |
1776 | ||
1777 | #define EXT3_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR | |
1778 | #define EXT3_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ | |
1779 | EXT4_FEATURE_INCOMPAT_RECOVER| \ | |
1780 | EXT4_FEATURE_INCOMPAT_META_BG) | |
1781 | #define EXT3_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ | |
1782 | EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ | |
1783 | EXT4_FEATURE_RO_COMPAT_BTREE_DIR) | |
1784 | ||
e2b911c5 | 1785 | #define EXT4_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR |
617ba13b MC |
1786 | #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ |
1787 | EXT4_FEATURE_INCOMPAT_RECOVER| \ | |
a86c6181 | 1788 | EXT4_FEATURE_INCOMPAT_META_BG| \ |
bd81d8ee | 1789 | EXT4_FEATURE_INCOMPAT_EXTENTS| \ |
ce421581 | 1790 | EXT4_FEATURE_INCOMPAT_64BIT| \ |
c5e06d10 | 1791 | EXT4_FEATURE_INCOMPAT_FLEX_BG| \ |
6ddb2447 TT |
1792 | EXT4_FEATURE_INCOMPAT_MMP | \ |
1793 | EXT4_FEATURE_INCOMPAT_INLINE_DATA | \ | |
8c81bd8f DW |
1794 | EXT4_FEATURE_INCOMPAT_ENCRYPT | \ |
1795 | EXT4_FEATURE_INCOMPAT_CSUM_SEED) | |
617ba13b MC |
1796 | #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ |
1797 | EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ | |
717d50e4 | 1798 | EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \ |
f8628a14 | 1799 | EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \ |
ef7f3835 | 1800 | EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \ |
0fc1b451 | 1801 | EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\ |
6f16b606 | 1802 | EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\ |
e93376c2 | 1803 | EXT4_FEATURE_RO_COMPAT_BIGALLOC |\ |
7c319d32 | 1804 | EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\ |
040cb378 LX |
1805 | EXT4_FEATURE_RO_COMPAT_QUOTA |\ |
1806 | EXT4_FEATURE_RO_COMPAT_PROJECT) | |
ac27a0ec | 1807 | |
e2b911c5 DW |
1808 | #define EXTN_FEATURE_FUNCS(ver) \ |
1809 | static inline bool ext4_has_unknown_ext##ver##_compat_features(struct super_block *sb) \ | |
1810 | { \ | |
1811 | return ((EXT4_SB(sb)->s_es->s_feature_compat & \ | |
1812 | cpu_to_le32(~EXT##ver##_FEATURE_COMPAT_SUPP)) != 0); \ | |
1813 | } \ | |
1814 | static inline bool ext4_has_unknown_ext##ver##_ro_compat_features(struct super_block *sb) \ | |
1815 | { \ | |
1816 | return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \ | |
1817 | cpu_to_le32(~EXT##ver##_FEATURE_RO_COMPAT_SUPP)) != 0); \ | |
1818 | } \ | |
1819 | static inline bool ext4_has_unknown_ext##ver##_incompat_features(struct super_block *sb) \ | |
1820 | { \ | |
1821 | return ((EXT4_SB(sb)->s_es->s_feature_incompat & \ | |
1822 | cpu_to_le32(~EXT##ver##_FEATURE_INCOMPAT_SUPP)) != 0); \ | |
1823 | } | |
1824 | ||
1825 | EXTN_FEATURE_FUNCS(2) | |
1826 | EXTN_FEATURE_FUNCS(3) | |
1827 | EXTN_FEATURE_FUNCS(4) | |
1828 | ||
1829 | static inline bool ext4_has_compat_features(struct super_block *sb) | |
1830 | { | |
1831 | return (EXT4_SB(sb)->s_es->s_feature_compat != 0); | |
1832 | } | |
1833 | static inline bool ext4_has_ro_compat_features(struct super_block *sb) | |
1834 | { | |
1835 | return (EXT4_SB(sb)->s_es->s_feature_ro_compat != 0); | |
1836 | } | |
1837 | static inline bool ext4_has_incompat_features(struct super_block *sb) | |
1838 | { | |
1839 | return (EXT4_SB(sb)->s_es->s_feature_incompat != 0); | |
1840 | } | |
1841 | ||
ac27a0ec DK |
1842 | /* |
1843 | * Default values for user and/or group using reserved blocks | |
1844 | */ | |
617ba13b MC |
1845 | #define EXT4_DEF_RESUID 0 |
1846 | #define EXT4_DEF_RESGID 0 | |
ac27a0ec | 1847 | |
040cb378 LX |
1848 | /* |
1849 | * Default project ID | |
1850 | */ | |
1851 | #define EXT4_DEF_PROJID 0 | |
1852 | ||
240799cd TT |
1853 | #define EXT4_DEF_INODE_READAHEAD_BLKS 32 |
1854 | ||
ac27a0ec DK |
1855 | /* |
1856 | * Default mount options | |
1857 | */ | |
617ba13b MC |
1858 | #define EXT4_DEFM_DEBUG 0x0001 |
1859 | #define EXT4_DEFM_BSDGROUPS 0x0002 | |
1860 | #define EXT4_DEFM_XATTR_USER 0x0004 | |
1861 | #define EXT4_DEFM_ACL 0x0008 | |
1862 | #define EXT4_DEFM_UID16 0x0010 | |
1863 | #define EXT4_DEFM_JMODE 0x0060 | |
1864 | #define EXT4_DEFM_JMODE_DATA 0x0020 | |
1865 | #define EXT4_DEFM_JMODE_ORDERED 0x0040 | |
1866 | #define EXT4_DEFM_JMODE_WBACK 0x0060 | |
8b67f04a TT |
1867 | #define EXT4_DEFM_NOBARRIER 0x0100 |
1868 | #define EXT4_DEFM_BLOCK_VALIDITY 0x0200 | |
1869 | #define EXT4_DEFM_DISCARD 0x0400 | |
1870 | #define EXT4_DEFM_NODELALLOC 0x0800 | |
ac27a0ec | 1871 | |
30773840 TT |
1872 | /* |
1873 | * Default journal batch times | |
1874 | */ | |
1875 | #define EXT4_DEF_MIN_BATCH_TIME 0 | |
1876 | #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */ | |
1877 | ||
a4912123 TT |
1878 | /* |
1879 | * Minimum number of groups in a flexgroup before we separate out | |
1880 | * directories into the first block group of a flexgroup | |
1881 | */ | |
1882 | #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4 | |
1883 | ||
ac27a0ec DK |
1884 | /* |
1885 | * Structure of a directory entry | |
1886 | */ | |
617ba13b | 1887 | #define EXT4_NAME_LEN 255 |
ac27a0ec | 1888 | |
617ba13b | 1889 | struct ext4_dir_entry { |
ac27a0ec DK |
1890 | __le32 inode; /* Inode number */ |
1891 | __le16 rec_len; /* Directory entry length */ | |
1892 | __le16 name_len; /* Name length */ | |
617ba13b | 1893 | char name[EXT4_NAME_LEN]; /* File name */ |
ac27a0ec DK |
1894 | }; |
1895 | ||
1896 | /* | |
617ba13b | 1897 | * The new version of the directory entry. Since EXT4 structures are |
ac27a0ec DK |
1898 | * stored in intel byte order, and the name_len field could never be |
1899 | * bigger than 255 chars, it's safe to reclaim the extra byte for the | |
1900 | * file_type field. | |
1901 | */ | |
617ba13b | 1902 | struct ext4_dir_entry_2 { |
ac27a0ec DK |
1903 | __le32 inode; /* Inode number */ |
1904 | __le16 rec_len; /* Directory entry length */ | |
1905 | __u8 name_len; /* Name length */ | |
1906 | __u8 file_type; | |
617ba13b | 1907 | char name[EXT4_NAME_LEN]; /* File name */ |
ac27a0ec DK |
1908 | }; |
1909 | ||
e6153918 DW |
1910 | /* |
1911 | * This is a bogus directory entry at the end of each leaf block that | |
1912 | * records checksums. | |
1913 | */ | |
1914 | struct ext4_dir_entry_tail { | |
1915 | __le32 det_reserved_zero1; /* Pretend to be unused */ | |
1916 | __le16 det_rec_len; /* 12 */ | |
1917 | __u8 det_reserved_zero2; /* Zero name length */ | |
1918 | __u8 det_reserved_ft; /* 0xDE, fake file type */ | |
1919 | __le32 det_checksum; /* crc32c(uuid+inum+dirblock) */ | |
1920 | }; | |
1921 | ||
3c47d541 TM |
1922 | #define EXT4_DIRENT_TAIL(block, blocksize) \ |
1923 | ((struct ext4_dir_entry_tail *)(((void *)(block)) + \ | |
1924 | ((blocksize) - \ | |
1925 | sizeof(struct ext4_dir_entry_tail)))) | |
1926 | ||
ac27a0ec | 1927 | /* |
617ba13b | 1928 | * Ext4 directory file types. Only the low 3 bits are used. The |
ac27a0ec DK |
1929 | * other bits are reserved for now. |
1930 | */ | |
617ba13b MC |
1931 | #define EXT4_FT_UNKNOWN 0 |
1932 | #define EXT4_FT_REG_FILE 1 | |
1933 | #define EXT4_FT_DIR 2 | |
1934 | #define EXT4_FT_CHRDEV 3 | |
1935 | #define EXT4_FT_BLKDEV 4 | |
1936 | #define EXT4_FT_FIFO 5 | |
1937 | #define EXT4_FT_SOCK 6 | |
1938 | #define EXT4_FT_SYMLINK 7 | |
ac27a0ec | 1939 | |
617ba13b | 1940 | #define EXT4_FT_MAX 8 |
ac27a0ec | 1941 | |
e6153918 DW |
1942 | #define EXT4_FT_DIR_CSUM 0xDE |
1943 | ||
ac27a0ec | 1944 | /* |
617ba13b | 1945 | * EXT4_DIR_PAD defines the directory entries boundaries |
ac27a0ec DK |
1946 | * |
1947 | * NOTE: It must be a multiple of 4 | |
1948 | */ | |
617ba13b MC |
1949 | #define EXT4_DIR_PAD 4 |
1950 | #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1) | |
1951 | #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \ | |
1952 | ~EXT4_DIR_ROUND) | |
a72d7f83 JK |
1953 | #define EXT4_MAX_REC_LEN ((1<<16)-1) |
1954 | ||
0cfc9255 ES |
1955 | /* |
1956 | * If we ever get support for fs block sizes > page_size, we'll need | |
1957 | * to remove the #if statements in the next two functions... | |
1958 | */ | |
1959 | static inline unsigned int | |
1960 | ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize) | |
1961 | { | |
1962 | unsigned len = le16_to_cpu(dlen); | |
1963 | ||
1964 | #if (PAGE_CACHE_SIZE >= 65536) | |
1965 | if (len == EXT4_MAX_REC_LEN || len == 0) | |
1966 | return blocksize; | |
1967 | return (len & 65532) | ((len & 3) << 16); | |
1968 | #else | |
1969 | return len; | |
1970 | #endif | |
1971 | } | |
1972 | ||
1973 | static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize) | |
1974 | { | |
1975 | if ((len > blocksize) || (blocksize > (1 << 18)) || (len & 3)) | |
1976 | BUG(); | |
1977 | #if (PAGE_CACHE_SIZE >= 65536) | |
1978 | if (len < 65536) | |
1979 | return cpu_to_le16(len); | |
1980 | if (len == blocksize) { | |
1981 | if (blocksize == 65536) | |
1982 | return cpu_to_le16(EXT4_MAX_REC_LEN); | |
1983 | else | |
1984 | return cpu_to_le16(0); | |
1985 | } | |
1986 | return cpu_to_le16((len & 65532) | ((len >> 16) & 3)); | |
1987 | #else | |
1988 | return cpu_to_le16(len); | |
1989 | #endif | |
1990 | } | |
1991 | ||
ac27a0ec DK |
1992 | /* |
1993 | * Hash Tree Directory indexing | |
1994 | * (c) Daniel Phillips, 2001 | |
1995 | */ | |
1996 | ||
e2b911c5 | 1997 | #define is_dx(dir) (ext4_has_feature_dir_index((dir)->i_sb) && \ |
12e9b892 | 1998 | ext4_test_inode_flag((dir), EXT4_INODE_INDEX)) |
617ba13b MC |
1999 | #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX) |
2000 | #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1) | |
ac27a0ec DK |
2001 | |
2002 | /* Legal values for the dx_root hash_version field: */ | |
2003 | ||
2004 | #define DX_HASH_LEGACY 0 | |
2005 | #define DX_HASH_HALF_MD4 1 | |
2006 | #define DX_HASH_TEA 2 | |
f99b2589 TT |
2007 | #define DX_HASH_LEGACY_UNSIGNED 3 |
2008 | #define DX_HASH_HALF_MD4_UNSIGNED 4 | |
2009 | #define DX_HASH_TEA_UNSIGNED 5 | |
ac27a0ec | 2010 | |
0441984a DW |
2011 | static inline u32 ext4_chksum(struct ext4_sb_info *sbi, u32 crc, |
2012 | const void *address, unsigned int length) | |
2013 | { | |
2014 | struct { | |
2015 | struct shash_desc shash; | |
3108b54b | 2016 | char ctx[4]; |
0441984a DW |
2017 | } desc; |
2018 | int err; | |
2019 | ||
3108b54b TT |
2020 | BUG_ON(crypto_shash_descsize(sbi->s_chksum_driver)!=sizeof(desc.ctx)); |
2021 | ||
0441984a DW |
2022 | desc.shash.tfm = sbi->s_chksum_driver; |
2023 | desc.shash.flags = 0; | |
2024 | *(u32 *)desc.ctx = crc; | |
2025 | ||
2026 | err = crypto_shash_update(&desc.shash, address, length); | |
2027 | BUG_ON(err); | |
2028 | ||
2029 | return *(u32 *)desc.ctx; | |
2030 | } | |
2031 | ||
ac27a0ec DK |
2032 | #ifdef __KERNEL__ |
2033 | ||
2034 | /* hash info structure used by the directory hash */ | |
2035 | struct dx_hash_info | |
2036 | { | |
2037 | u32 hash; | |
2038 | u32 minor_hash; | |
2039 | int hash_version; | |
2040 | u32 *seed; | |
2041 | }; | |
2042 | ||
d1f5273e FY |
2043 | |
2044 | /* 32 and 64 bit signed EOF for dx directories */ | |
2045 | #define EXT4_HTREE_EOF_32BIT ((1UL << (32 - 1)) - 1) | |
2046 | #define EXT4_HTREE_EOF_64BIT ((1ULL << (64 - 1)) - 1) | |
2047 | ||
ac27a0ec DK |
2048 | |
2049 | /* | |
617ba13b | 2050 | * Control parameters used by ext4_htree_next_block |
ac27a0ec DK |
2051 | */ |
2052 | #define HASH_NB_ALWAYS 1 | |
2053 | ||
5b643f9c TT |
2054 | struct ext4_filename { |
2055 | const struct qstr *usr_fname; | |
2056 | struct ext4_str disk_name; | |
2057 | struct dx_hash_info hinfo; | |
2058 | #ifdef CONFIG_EXT4_FS_ENCRYPTION | |
2059 | struct ext4_str crypto_buf; | |
2060 | #endif | |
2061 | }; | |
2062 | ||
2063 | #define fname_name(p) ((p)->disk_name.name) | |
2064 | #define fname_len(p) ((p)->disk_name.len) | |
ac27a0ec DK |
2065 | |
2066 | /* | |
2067 | * Describe an inode's exact location on disk and in memory | |
2068 | */ | |
617ba13b | 2069 | struct ext4_iloc |
ac27a0ec DK |
2070 | { |
2071 | struct buffer_head *bh; | |
2072 | unsigned long offset; | |
fd2d4291 | 2073 | ext4_group_t block_group; |
ac27a0ec DK |
2074 | }; |
2075 | ||
617ba13b | 2076 | static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc) |
ac27a0ec | 2077 | { |
617ba13b | 2078 | return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset); |
ac27a0ec DK |
2079 | } |
2080 | ||
2081 | /* | |
2082 | * This structure is stuffed into the struct file's private_data field | |
2083 | * for directories. It is where we put information so that we can do | |
2084 | * readdir operations in hash tree order. | |
2085 | */ | |
2086 | struct dir_private_info { | |
2087 | struct rb_root root; | |
2088 | struct rb_node *curr_node; | |
2089 | struct fname *extra_fname; | |
2090 | loff_t last_pos; | |
2091 | __u32 curr_hash; | |
2092 | __u32 curr_minor_hash; | |
2093 | __u32 next_hash; | |
2094 | }; | |
2095 | ||
2096 | /* calculate the first block number of the group */ | |
617ba13b | 2097 | static inline ext4_fsblk_t |
fd2d4291 | 2098 | ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no) |
ac27a0ec | 2099 | { |
617ba13b MC |
2100 | return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) + |
2101 | le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block); | |
ac27a0ec DK |
2102 | } |
2103 | ||
2104 | /* | |
2105 | * Special error return code only used by dx_probe() and its callers. | |
2106 | */ | |
36de9286 | 2107 | #define ERR_BAD_DX_DIR (-(MAX_ERRNO - 1)) |
ac27a0ec | 2108 | |
bfff6873 LC |
2109 | /* |
2110 | * Timeout and state flag for lazy initialization inode thread. | |
2111 | */ | |
2112 | #define EXT4_DEF_LI_WAIT_MULT 10 | |
2113 | #define EXT4_DEF_LI_MAX_START_DELAY 5 | |
2114 | #define EXT4_LAZYINIT_QUIT 0x0001 | |
2115 | #define EXT4_LAZYINIT_RUNNING 0x0002 | |
2116 | ||
2117 | /* | |
2118 | * Lazy inode table initialization info | |
2119 | */ | |
2120 | struct ext4_lazy_init { | |
2121 | unsigned long li_state; | |
bfff6873 LC |
2122 | struct list_head li_request_list; |
2123 | struct mutex li_list_mtx; | |
2124 | }; | |
2125 | ||
2126 | struct ext4_li_request { | |
2127 | struct super_block *lr_super; | |
2128 | struct ext4_sb_info *lr_sbi; | |
2129 | ext4_group_t lr_next_group; | |
2130 | struct list_head lr_request; | |
2131 | unsigned long lr_next_sched; | |
2132 | unsigned long lr_timeout; | |
2133 | }; | |
2134 | ||
857ac889 LC |
2135 | struct ext4_features { |
2136 | struct kobject f_kobj; | |
2137 | struct completion f_kobj_unregister; | |
2138 | }; | |
2139 | ||
c5e06d10 JL |
2140 | /* |
2141 | * This structure will be used for multiple mount protection. It will be | |
2142 | * written into the block number saved in the s_mmp_block field in the | |
2143 | * superblock. Programs that check MMP should assume that if | |
2144 | * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe | |
2145 | * to use the filesystem, regardless of how old the timestamp is. | |
2146 | */ | |
2147 | #define EXT4_MMP_MAGIC 0x004D4D50U /* ASCII for MMP */ | |
2148 | #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */ | |
2149 | #define EXT4_MMP_SEQ_FSCK 0xE24D4D50U /* mmp_seq value when being fscked */ | |
2150 | #define EXT4_MMP_SEQ_MAX 0xE24D4D4FU /* maximum valid mmp_seq value */ | |
2151 | ||
2152 | struct mmp_struct { | |
2153 | __le32 mmp_magic; /* Magic number for MMP */ | |
2154 | __le32 mmp_seq; /* Sequence no. updated periodically */ | |
2155 | ||
2156 | /* | |
2157 | * mmp_time, mmp_nodename & mmp_bdevname are only used for information | |
2158 | * purposes and do not affect the correctness of the algorithm | |
2159 | */ | |
2160 | __le64 mmp_time; /* Time last updated */ | |
2161 | char mmp_nodename[64]; /* Node which last updated MMP block */ | |
2162 | char mmp_bdevname[32]; /* Bdev which last updated MMP block */ | |
2163 | ||
2164 | /* | |
2165 | * mmp_check_interval is used to verify if the MMP block has been | |
2166 | * updated on the block device. The value is updated based on the | |
2167 | * maximum time to write the MMP block during an update cycle. | |
2168 | */ | |
2169 | __le16 mmp_check_interval; | |
2170 | ||
2171 | __le16 mmp_pad1; | |
e6153918 DW |
2172 | __le32 mmp_pad2[226]; |
2173 | __le32 mmp_checksum; /* crc32c(uuid+mmp_block) */ | |
c5e06d10 JL |
2174 | }; |
2175 | ||
2176 | /* arguments passed to the mmp thread */ | |
2177 | struct mmpd_data { | |
2178 | struct buffer_head *bh; /* bh from initial read_mmp_block() */ | |
2179 | struct super_block *sb; /* super block of the fs */ | |
2180 | }; | |
2181 | ||
2182 | /* | |
2183 | * Check interval multiplier | |
2184 | * The MMP block is written every update interval and initially checked every | |
2185 | * update interval x the multiplier (the value is then adapted based on the | |
2186 | * write latency). The reason is that writes can be delayed under load and we | |
2187 | * don't want readers to incorrectly assume that the filesystem is no longer | |
2188 | * in use. | |
2189 | */ | |
2190 | #define EXT4_MMP_CHECK_MULT 2UL | |
2191 | ||
2192 | /* | |
2193 | * Minimum interval for MMP checking in seconds. | |
2194 | */ | |
2195 | #define EXT4_MMP_MIN_CHECK_INTERVAL 5UL | |
2196 | ||
2197 | /* | |
2198 | * Maximum interval for MMP checking in seconds. | |
2199 | */ | |
2200 | #define EXT4_MMP_MAX_CHECK_INTERVAL 300UL | |
2201 | ||
ac27a0ec DK |
2202 | /* |
2203 | * Function prototypes | |
2204 | */ | |
2205 | ||
2206 | /* | |
2207 | * Ok, these declarations are also in <linux/kernel.h> but none of the | |
617ba13b | 2208 | * ext4 source programs needs to include it so they are duplicated here. |
ac27a0ec | 2209 | */ |
8c55e204 DK |
2210 | # define NORET_TYPE /**/ |
2211 | # define ATTRIB_NORET __attribute__((noreturn)) | |
2212 | # define NORET_AND noreturn, | |
ac27a0ec | 2213 | |
498e5f24 | 2214 | /* bitmap.c */ |
f6fb99ca | 2215 | extern unsigned int ext4_count_free(char *bitmap, unsigned numchars); |
41a246d1 DW |
2216 | void ext4_inode_bitmap_csum_set(struct super_block *sb, ext4_group_t group, |
2217 | struct ext4_group_desc *gdp, | |
2218 | struct buffer_head *bh, int sz); | |
2219 | int ext4_inode_bitmap_csum_verify(struct super_block *sb, ext4_group_t group, | |
2220 | struct ext4_group_desc *gdp, | |
2221 | struct buffer_head *bh, int sz); | |
fa77dcfa DW |
2222 | void ext4_block_bitmap_csum_set(struct super_block *sb, ext4_group_t group, |
2223 | struct ext4_group_desc *gdp, | |
79f1ba49 | 2224 | struct buffer_head *bh); |
fa77dcfa DW |
2225 | int ext4_block_bitmap_csum_verify(struct super_block *sb, ext4_group_t group, |
2226 | struct ext4_group_desc *gdp, | |
79f1ba49 | 2227 | struct buffer_head *bh); |
498e5f24 | 2228 | |
ac27a0ec | 2229 | /* balloc.c */ |
bd86298e LC |
2230 | extern void ext4_get_group_no_and_offset(struct super_block *sb, |
2231 | ext4_fsblk_t blocknr, | |
2232 | ext4_group_t *blockgrpp, | |
2233 | ext4_grpblk_t *offsetp); | |
2234 | extern ext4_group_t ext4_get_group_number(struct super_block *sb, | |
2235 | ext4_fsblk_t block); | |
2236 | ||
3a5b2ecd MC |
2237 | extern unsigned int ext4_block_group(struct super_block *sb, |
2238 | ext4_fsblk_t blocknr); | |
2239 | extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb, | |
2240 | ext4_fsblk_t blocknr); | |
fd2d4291 AM |
2241 | extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group); |
2242 | extern unsigned long ext4_bg_num_gdb(struct super_block *sb, | |
2243 | ext4_group_t group); | |
7061eba7 | 2244 | extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode, |
55f020db AH |
2245 | ext4_fsblk_t goal, |
2246 | unsigned int flags, | |
2247 | unsigned long *count, | |
2248 | int *errp); | |
e7d5f315 TT |
2249 | extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi, |
2250 | s64 nclusters, unsigned int flags); | |
5dee5437 | 2251 | extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *); |
af5bc92d | 2252 | extern void ext4_check_blocks_bitmap(struct super_block *); |
617ba13b | 2253 | extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb, |
fd2d4291 | 2254 | ext4_group_t block_group, |
ac27a0ec | 2255 | struct buffer_head ** bh); |
617ba13b | 2256 | extern int ext4_should_retry_alloc(struct super_block *sb, int *retries); |
813e5727 TT |
2257 | |
2258 | extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb, | |
2259 | ext4_group_t block_group); | |
2260 | extern int ext4_wait_block_bitmap(struct super_block *sb, | |
2261 | ext4_group_t block_group, | |
2262 | struct buffer_head *bh); | |
2263 | extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb, | |
2264 | ext4_group_t block_group); | |
cff1dfd7 TT |
2265 | extern unsigned ext4_free_clusters_after_init(struct super_block *sb, |
2266 | ext4_group_t block_group, | |
2267 | struct ext4_group_desc *gdp); | |
f86186b4 | 2268 | ext4_fsblk_t ext4_inode_to_goal_block(struct inode *); |
ac27a0ec | 2269 | |
9bd8212f MH |
2270 | /* crypto_policy.c */ |
2271 | int ext4_is_child_context_consistent_with_parent(struct inode *parent, | |
2272 | struct inode *child); | |
2273 | int ext4_inherit_context(struct inode *parent, struct inode *child); | |
2274 | void ext4_to_hex(char *dst, char *src, size_t src_size); | |
2275 | int ext4_process_policy(const struct ext4_encryption_policy *policy, | |
2276 | struct inode *inode); | |
2277 | int ext4_get_policy(struct inode *inode, | |
2278 | struct ext4_encryption_policy *policy); | |
2279 | ||
b30ab0e0 | 2280 | /* crypto.c */ |
8ee03714 | 2281 | extern struct kmem_cache *ext4_crypt_info_cachep; |
b30ab0e0 MH |
2282 | bool ext4_valid_contents_enc_mode(uint32_t mode); |
2283 | uint32_t ext4_validate_encryption_key_size(uint32_t mode, uint32_t size); | |
2284 | extern struct workqueue_struct *ext4_read_workqueue; | |
2285 | struct ext4_crypto_ctx *ext4_get_crypto_ctx(struct inode *inode); | |
2286 | void ext4_release_crypto_ctx(struct ext4_crypto_ctx *ctx); | |
2287 | void ext4_restore_control_page(struct page *data_page); | |
2288 | struct page *ext4_encrypt(struct inode *inode, | |
2289 | struct page *plaintext_page); | |
3684de8c | 2290 | int ext4_decrypt(struct page *page); |
53085fac JK |
2291 | int ext4_encrypted_zeroout(struct inode *inode, ext4_lblk_t lblk, |
2292 | ext4_fsblk_t pblk, ext4_lblk_t len); | |
28b4c263 | 2293 | extern const struct dentry_operations ext4_encrypted_d_ops; |
b30ab0e0 MH |
2294 | |
2295 | #ifdef CONFIG_EXT4_FS_ENCRYPTION | |
2296 | int ext4_init_crypto(void); | |
2297 | void ext4_exit_crypto(void); | |
2298 | static inline int ext4_sb_has_crypto(struct super_block *sb) | |
2299 | { | |
e2b911c5 | 2300 | return ext4_has_feature_encrypt(sb); |
b30ab0e0 MH |
2301 | } |
2302 | #else | |
2303 | static inline int ext4_init_crypto(void) { return 0; } | |
2304 | static inline void ext4_exit_crypto(void) { } | |
2305 | static inline int ext4_sb_has_crypto(struct super_block *sb) | |
2306 | { | |
2307 | return 0; | |
2308 | } | |
2309 | #endif | |
2310 | ||
d5d0e8c7 MH |
2311 | /* crypto_fname.c */ |
2312 | bool ext4_valid_filenames_enc_mode(uint32_t mode); | |
2313 | u32 ext4_fname_crypto_round_up(u32 size, u32 blksize); | |
4d3c4e5b | 2314 | unsigned ext4_fname_encrypted_size(struct inode *inode, u32 ilen); |
b7236e21 | 2315 | int ext4_fname_crypto_alloc_buffer(struct inode *inode, |
d5d0e8c7 | 2316 | u32 ilen, struct ext4_str *crypto_str); |
b7236e21 | 2317 | int _ext4_fname_disk_to_usr(struct inode *inode, |
5de0b4d0 | 2318 | struct dx_hash_info *hinfo, |
d5d0e8c7 MH |
2319 | const struct ext4_str *iname, |
2320 | struct ext4_str *oname); | |
b7236e21 | 2321 | int ext4_fname_disk_to_usr(struct inode *inode, |
5de0b4d0 | 2322 | struct dx_hash_info *hinfo, |
d5d0e8c7 MH |
2323 | const struct ext4_dir_entry_2 *de, |
2324 | struct ext4_str *oname); | |
b7236e21 | 2325 | int ext4_fname_usr_to_disk(struct inode *inode, |
d5d0e8c7 MH |
2326 | const struct qstr *iname, |
2327 | struct ext4_str *oname); | |
d5d0e8c7 | 2328 | #ifdef CONFIG_EXT4_FS_ENCRYPTION |
d5d0e8c7 | 2329 | void ext4_fname_crypto_free_buffer(struct ext4_str *crypto_str); |
5b643f9c TT |
2330 | int ext4_fname_setup_filename(struct inode *dir, const struct qstr *iname, |
2331 | int lookup, struct ext4_filename *fname); | |
2332 | void ext4_fname_free_filename(struct ext4_filename *fname); | |
d5d0e8c7 MH |
2333 | #else |
2334 | static inline | |
b7236e21 | 2335 | int ext4_setup_fname_crypto(struct inode *inode) |
d5d0e8c7 | 2336 | { |
b7236e21 | 2337 | return 0; |
d5d0e8c7 MH |
2338 | } |
2339 | static inline void ext4_fname_crypto_free_buffer(struct ext4_str *p) { } | |
5b643f9c TT |
2340 | static inline int ext4_fname_setup_filename(struct inode *dir, |
2341 | const struct qstr *iname, | |
2342 | int lookup, struct ext4_filename *fname) | |
2343 | { | |
2344 | fname->usr_fname = iname; | |
2345 | fname->disk_name.name = (unsigned char *) iname->name; | |
2346 | fname->disk_name.len = iname->len; | |
2347 | return 0; | |
2348 | } | |
2349 | static inline void ext4_fname_free_filename(struct ext4_filename *fname) { } | |
d5d0e8c7 MH |
2350 | #endif |
2351 | ||
2352 | ||
88bd6ccd | 2353 | /* crypto_key.c */ |
c936e1ec TT |
2354 | void ext4_free_crypt_info(struct ext4_crypt_info *ci); |
2355 | void ext4_free_encryption_info(struct inode *inode, struct ext4_crypt_info *ci); | |
b7236e21 | 2356 | int _ext4_get_encryption_info(struct inode *inode); |
88bd6ccd MH |
2357 | |
2358 | #ifdef CONFIG_EXT4_FS_ENCRYPTION | |
2359 | int ext4_has_encryption_key(struct inode *inode); | |
b7236e21 TT |
2360 | |
2361 | static inline int ext4_get_encryption_info(struct inode *inode) | |
2362 | { | |
2363 | struct ext4_crypt_info *ci = EXT4_I(inode)->i_crypt_info; | |
2364 | ||
2365 | if (!ci || | |
2366 | (ci->ci_keyring_key && | |
2367 | (ci->ci_keyring_key->flags & ((1 << KEY_FLAG_INVALIDATED) | | |
2368 | (1 << KEY_FLAG_REVOKED) | | |
2369 | (1 << KEY_FLAG_DEAD))))) | |
2370 | return _ext4_get_encryption_info(inode); | |
2371 | return 0; | |
2372 | } | |
2373 | ||
e709e9df TT |
2374 | static inline struct ext4_crypt_info *ext4_encryption_info(struct inode *inode) |
2375 | { | |
2376 | return EXT4_I(inode)->i_crypt_info; | |
2377 | } | |
2378 | ||
88bd6ccd MH |
2379 | #else |
2380 | static inline int ext4_has_encryption_key(struct inode *inode) | |
2381 | { | |
2382 | return 0; | |
2383 | } | |
b7236e21 TT |
2384 | static inline int ext4_get_encryption_info(struct inode *inode) |
2385 | { | |
2386 | return 0; | |
2387 | } | |
e709e9df TT |
2388 | static inline struct ext4_crypt_info *ext4_encryption_info(struct inode *inode) |
2389 | { | |
2390 | return NULL; | |
2391 | } | |
88bd6ccd MH |
2392 | #endif |
2393 | ||
2394 | ||
ac27a0ec | 2395 | /* dir.c */ |
60fd4da3 | 2396 | extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *, |
f7c21177 | 2397 | struct file *, |
60fd4da3 | 2398 | struct ext4_dir_entry_2 *, |
226ba972 TM |
2399 | struct buffer_head *, char *, int, |
2400 | unsigned int); | |
2401 | #define ext4_check_dir_entry(dir, filp, de, bh, buf, size, offset) \ | |
f7c21177 | 2402 | unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \ |
226ba972 | 2403 | (de), (bh), (buf), (size), (offset))) |
617ba13b | 2404 | extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash, |
2f61830a TT |
2405 | __u32 minor_hash, |
2406 | struct ext4_dir_entry_2 *dirent, | |
2407 | struct ext4_str *ent_name); | |
617ba13b | 2408 | extern void ext4_htree_free_dir_info(struct dir_private_info *p); |
978fef91 TM |
2409 | extern int ext4_find_dest_de(struct inode *dir, struct inode *inode, |
2410 | struct buffer_head *bh, | |
2411 | void *buf, int buf_size, | |
5b643f9c | 2412 | struct ext4_filename *fname, |
978fef91 | 2413 | struct ext4_dir_entry_2 **dest_de); |
4bdfc873 | 2414 | int ext4_insert_dentry(struct inode *dir, |
5b643f9c TT |
2415 | struct inode *inode, |
2416 | struct ext4_dir_entry_2 *de, | |
2417 | int buf_size, | |
2418 | struct ext4_filename *fname); | |
978fef91 TM |
2419 | static inline void ext4_update_dx_flag(struct inode *inode) |
2420 | { | |
e2b911c5 | 2421 | if (!ext4_has_feature_dir_index(inode->i_sb)) |
978fef91 TM |
2422 | ext4_clear_inode_flag(inode, EXT4_INODE_INDEX); |
2423 | } | |
65d165d9 TM |
2424 | static unsigned char ext4_filetype_table[] = { |
2425 | DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK | |
2426 | }; | |
2427 | ||
2428 | static inline unsigned char get_dtype(struct super_block *sb, int filetype) | |
2429 | { | |
e2b911c5 | 2430 | if (!ext4_has_feature_filetype(sb) || filetype >= EXT4_FT_MAX) |
65d165d9 TM |
2431 | return DT_UNKNOWN; |
2432 | ||
2433 | return ext4_filetype_table[filetype]; | |
2434 | } | |
40b163f1 DW |
2435 | extern int ext4_check_all_de(struct inode *dir, struct buffer_head *bh, |
2436 | void *buf, int buf_size); | |
ac27a0ec DK |
2437 | |
2438 | /* fsync.c */ | |
02c24a82 | 2439 | extern int ext4_sync_file(struct file *, loff_t, loff_t, int); |
ac27a0ec DK |
2440 | |
2441 | /* hash.c */ | |
617ba13b | 2442 | extern int ext4fs_dirhash(const char *name, int len, struct |
ac27a0ec DK |
2443 | dx_hash_info *hinfo); |
2444 | ||
2445 | /* ialloc.c */ | |
1139575a TT |
2446 | extern struct inode *__ext4_new_inode(handle_t *, struct inode *, umode_t, |
2447 | const struct qstr *qstr, __u32 goal, | |
2448 | uid_t *owner, int handle_type, | |
2449 | unsigned int line_no, int nblocks); | |
2450 | ||
2451 | #define ext4_new_inode(handle, dir, mode, qstr, goal, owner) \ | |
2452 | __ext4_new_inode((handle), (dir), (mode), (qstr), (goal), (owner), \ | |
2453 | 0, 0, 0) | |
2454 | #define ext4_new_inode_start_handle(dir, mode, qstr, goal, owner, \ | |
2455 | type, nblocks) \ | |
2456 | __ext4_new_inode(NULL, (dir), (mode), (qstr), (goal), (owner), \ | |
2457 | (type), __LINE__, (nblocks)) | |
2458 | ||
2459 | ||
af5bc92d TT |
2460 | extern void ext4_free_inode(handle_t *, struct inode *); |
2461 | extern struct inode * ext4_orphan_get(struct super_block *, unsigned long); | |
2462 | extern unsigned long ext4_count_free_inodes(struct super_block *); | |
2463 | extern unsigned long ext4_count_dirs(struct super_block *); | |
2464 | extern void ext4_check_inodes_bitmap(struct super_block *); | |
61d08673 | 2465 | extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap); |
bfff6873 LC |
2466 | extern int ext4_init_inode_table(struct super_block *sb, |
2467 | ext4_group_t group, int barrier); | |
813e5727 | 2468 | extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate); |
ac27a0ec | 2469 | |
c9de560d | 2470 | /* mballoc.c */ |
ebd173be | 2471 | extern const struct file_operations ext4_seq_mb_groups_fops; |
c9de560d AT |
2472 | extern long ext4_mb_stats; |
2473 | extern long ext4_mb_max_to_scan; | |
9d99012f | 2474 | extern int ext4_mb_init(struct super_block *); |
c9de560d AT |
2475 | extern int ext4_mb_release(struct super_block *); |
2476 | extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *, | |
2477 | struct ext4_allocation_request *, int *); | |
2478 | extern int ext4_mb_reserve_blocks(struct super_block *, int); | |
c2ea3fde | 2479 | extern void ext4_discard_preallocations(struct inode *); |
5dabfc78 TT |
2480 | extern int __init ext4_init_mballoc(void); |
2481 | extern void ext4_exit_mballoc(void); | |
44338711 | 2482 | extern void ext4_free_blocks(handle_t *handle, struct inode *inode, |
e6362609 TT |
2483 | struct buffer_head *bh, ext4_fsblk_t block, |
2484 | unsigned long count, int flags); | |
28623c2f TT |
2485 | extern int ext4_mb_alloc_groupinfo(struct super_block *sb, |
2486 | ext4_group_t ngroups); | |
920313a7 | 2487 | extern int ext4_mb_add_groupinfo(struct super_block *sb, |
5f21b0e6 | 2488 | ext4_group_t i, struct ext4_group_desc *desc); |
cc7365df | 2489 | extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb, |
2846e820 | 2490 | ext4_fsblk_t block, unsigned long count); |
7360d173 LC |
2491 | extern int ext4_trim_fs(struct super_block *, struct fstrim_range *); |
2492 | ||
ac27a0ec | 2493 | /* inode.c */ |
f348c252 | 2494 | int ext4_inode_is_fast_symlink(struct inode *inode); |
10560082 | 2495 | struct buffer_head *ext4_getblk(handle_t *, struct inode *, ext4_lblk_t, int); |
1c215028 | 2496 | struct buffer_head *ext4_bread(handle_t *, struct inode *, ext4_lblk_t, int); |
705965bd JK |
2497 | int ext4_get_block_unwritten(struct inode *inode, sector_t iblock, |
2498 | struct buffer_head *bh_result, int create); | |
ba5843f5 JK |
2499 | int ext4_dax_mmap_get_block(struct inode *inode, sector_t iblock, |
2500 | struct buffer_head *bh_result, int create); | |
6873fa0d | 2501 | int ext4_get_block(struct inode *inode, sector_t iblock, |
705965bd JK |
2502 | struct buffer_head *bh_result, int create); |
2503 | int ext4_dio_get_block(struct inode *inode, sector_t iblock, | |
2504 | struct buffer_head *bh_result, int create); | |
9c3569b5 TM |
2505 | int ext4_da_get_block_prep(struct inode *inode, sector_t iblock, |
2506 | struct buffer_head *bh, int create); | |
f19d5870 TM |
2507 | int ext4_walk_page_buffers(handle_t *handle, |
2508 | struct buffer_head *head, | |
2509 | unsigned from, | |
2510 | unsigned to, | |
2511 | int *partial, | |
2512 | int (*fn)(handle_t *handle, | |
2513 | struct buffer_head *bh)); | |
2514 | int do_journal_get_write_access(handle_t *handle, | |
2515 | struct buffer_head *bh); | |
9c3569b5 TM |
2516 | #define FALL_BACK_TO_NONDELALLOC 1 |
2517 | #define CONVERT_INLINE_DATA 2 | |
ac27a0ec | 2518 | |
1d1fe1ee | 2519 | extern struct inode *ext4_iget(struct super_block *, unsigned long); |
f4bb2981 | 2520 | extern struct inode *ext4_iget_normal(struct super_block *, unsigned long); |
a9185b41 | 2521 | extern int ext4_write_inode(struct inode *, struct writeback_control *); |
af5bc92d | 2522 | extern int ext4_setattr(struct dentry *, struct iattr *); |
3e3398a0 MC |
2523 | extern int ext4_getattr(struct vfsmount *mnt, struct dentry *dentry, |
2524 | struct kstat *stat); | |
0930fcc1 AV |
2525 | extern void ext4_evict_inode(struct inode *); |
2526 | extern void ext4_clear_inode(struct inode *); | |
af5bc92d | 2527 | extern int ext4_sync_inode(handle_t *, struct inode *); |
aa385729 | 2528 | extern void ext4_dirty_inode(struct inode *, int); |
617ba13b MC |
2529 | extern int ext4_change_inode_journal_flag(struct inode *, int); |
2530 | extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *); | |
a361293f | 2531 | extern int ext4_inode_attach_jinode(struct inode *inode); |
91ef4caf | 2532 | extern int ext4_can_truncate(struct inode *inode); |
af5bc92d | 2533 | extern void ext4_truncate(struct inode *); |
aeb2817a | 2534 | extern int ext4_punch_hole(struct inode *inode, loff_t offset, loff_t length); |
487caeef | 2535 | extern int ext4_truncate_restart_trans(handle_t *, struct inode *, int nblocks); |
617ba13b | 2536 | extern void ext4_set_inode_flags(struct inode *); |
ff9ddf7e | 2537 | extern void ext4_get_inode_flags(struct ext4_inode_info *); |
ccd2506b | 2538 | extern int ext4_alloc_da_blocks(struct inode *inode); |
617ba13b | 2539 | extern void ext4_set_aops(struct inode *inode); |
a86c6181 | 2540 | extern int ext4_writepage_trans_blocks(struct inode *); |
f3bd1f3f | 2541 | extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks); |
a87dd18c LC |
2542 | extern int ext4_zero_partial_blocks(handle_t *handle, struct inode *inode, |
2543 | loff_t lstart, loff_t lend); | |
c2ec175c | 2544 | extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf); |
ea3d7209 | 2545 | extern int ext4_filemap_fault(struct vm_area_struct *vma, struct vm_fault *vmf); |
a9e7f447 | 2546 | extern qsize_t *ext4_get_reserved_space(struct inode *inode); |
040cb378 | 2547 | extern int ext4_get_projid(struct inode *inode, kprojid_t *projid); |
5f634d06 AK |
2548 | extern void ext4_da_update_reserve_space(struct inode *inode, |
2549 | int used, int quota_claim); | |
53085fac JK |
2550 | extern int ext4_issue_zeroout(struct inode *inode, ext4_lblk_t lblk, |
2551 | ext4_fsblk_t pblk, ext4_lblk_t len); | |
2d90c160 JK |
2552 | extern int ext4_get_next_extent(struct inode *inode, ext4_lblk_t lblk, |
2553 | unsigned int map_len, | |
2554 | struct extent_status *result); | |
dae1e52c AG |
2555 | |
2556 | /* indirect.c */ | |
2557 | extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode, | |
2558 | struct ext4_map_blocks *map, int flags); | |
6f673763 OS |
2559 | extern ssize_t ext4_ind_direct_IO(struct kiocb *iocb, struct iov_iter *iter, |
2560 | loff_t offset); | |
dae1e52c | 2561 | extern int ext4_ind_calc_metadata_amount(struct inode *inode, sector_t lblock); |
fa55a0ed | 2562 | extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks); |
819c4920 | 2563 | extern void ext4_ind_truncate(handle_t *, struct inode *inode); |
4f579ae7 LC |
2564 | extern int ext4_ind_remove_space(handle_t *handle, struct inode *inode, |
2565 | ext4_lblk_t start, ext4_lblk_t end); | |
ff9893dc | 2566 | |
ac27a0ec | 2567 | /* ioctl.c */ |
5cdd7b2d | 2568 | extern long ext4_ioctl(struct file *, unsigned int, unsigned long); |
af5bc92d | 2569 | extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long); |
ac27a0ec | 2570 | |
c14c6fd5 | 2571 | /* migrate.c */ |
2a43a878 | 2572 | extern int ext4_ext_migrate(struct inode *); |
0d14b098 | 2573 | extern int ext4_ind_migrate(struct inode *inode); |
3d0518f4 | 2574 | |
ac27a0ec | 2575 | /* namei.c */ |
b0336e8d DW |
2576 | extern int ext4_dirent_csum_verify(struct inode *inode, |
2577 | struct ext4_dir_entry *dirent); | |
617ba13b MC |
2578 | extern int ext4_orphan_add(handle_t *, struct inode *); |
2579 | extern int ext4_orphan_del(handle_t *, struct inode *); | |
2580 | extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash, | |
ac27a0ec | 2581 | __u32 start_minor_hash, __u32 *next_hash); |
5b643f9c TT |
2582 | extern int ext4_search_dir(struct buffer_head *bh, |
2583 | char *search_buf, | |
2584 | int buf_size, | |
2585 | struct inode *dir, | |
2586 | struct ext4_filename *fname, | |
2587 | const struct qstr *d_name, | |
2588 | unsigned int offset, | |
2589 | struct ext4_dir_entry_2 **res_dir); | |
05019a9e TM |
2590 | extern int ext4_generic_delete_entry(handle_t *handle, |
2591 | struct inode *dir, | |
2592 | struct ext4_dir_entry_2 *de_del, | |
2593 | struct buffer_head *bh, | |
2594 | void *entry_buf, | |
2595 | int buf_size, | |
2596 | int csum_size); | |
e875a2dd | 2597 | extern int ext4_empty_dir(struct inode *inode); |
ac27a0ec DK |
2598 | |
2599 | /* resize.c */ | |
617ba13b MC |
2600 | extern int ext4_group_add(struct super_block *sb, |
2601 | struct ext4_new_group_data *input); | |
2602 | extern int ext4_group_extend(struct super_block *sb, | |
2603 | struct ext4_super_block *es, | |
2604 | ext4_fsblk_t n_blocks_count); | |
19c5246d | 2605 | extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count); |
ac27a0ec DK |
2606 | |
2607 | /* super.c */ | |
ebd173be | 2608 | extern int ext4_seq_options_show(struct seq_file *seq, void *offset); |
952fc18e | 2609 | extern int ext4_calculate_overhead(struct super_block *sb); |
06db49e6 | 2610 | extern void ext4_superblock_csum_set(struct super_block *sb); |
9933fc0a TT |
2611 | extern void *ext4_kvmalloc(size_t size, gfp_t flags); |
2612 | extern void *ext4_kvzalloc(size_t size, gfp_t flags); | |
117fff10 TT |
2613 | extern int ext4_alloc_flex_bg_array(struct super_block *sb, |
2614 | ext4_group_t ngroup); | |
722887dd TT |
2615 | extern const char *ext4_decode_error(struct super_block *sb, int errno, |
2616 | char nbuf[16]); | |
e7c96e8e | 2617 | |
b9075fa9 JP |
2618 | extern __printf(4, 5) |
2619 | void __ext4_error(struct super_block *, const char *, unsigned int, | |
2620 | const char *, ...); | |
b9075fa9 | 2621 | extern __printf(5, 6) |
e7c96e8e | 2622 | void __ext4_error_inode(struct inode *, const char *, unsigned int, ext4_fsblk_t, |
b9075fa9 JP |
2623 | const char *, ...); |
2624 | extern __printf(5, 6) | |
e7c96e8e | 2625 | void __ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t, |
b9075fa9 | 2626 | const char *, ...); |
c398eda0 TT |
2627 | extern void __ext4_std_error(struct super_block *, const char *, |
2628 | unsigned int, int); | |
b9075fa9 JP |
2629 | extern __printf(4, 5) |
2630 | void __ext4_abort(struct super_block *, const char *, unsigned int, | |
2631 | const char *, ...); | |
b9075fa9 JP |
2632 | extern __printf(4, 5) |
2633 | void __ext4_warning(struct super_block *, const char *, unsigned int, | |
2634 | const char *, ...); | |
b03a2f7e AD |
2635 | extern __printf(4, 5) |
2636 | void __ext4_warning_inode(const struct inode *inode, const char *function, | |
2637 | unsigned int line, const char *fmt, ...); | |
b9075fa9 | 2638 | extern __printf(3, 4) |
e7c96e8e | 2639 | void __ext4_msg(struct super_block *, const char *, const char *, ...); |
c5e06d10 JL |
2640 | extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp, |
2641 | const char *, unsigned int, const char *); | |
b9075fa9 JP |
2642 | extern __printf(7, 8) |
2643 | void __ext4_grp_locked_error(const char *, unsigned int, | |
2644 | struct super_block *, ext4_group_t, | |
2645 | unsigned long, ext4_fsblk_t, | |
2646 | const char *, ...); | |
e7c96e8e | 2647 | |
b03a2f7e AD |
2648 | #define EXT4_ERROR_INODE(inode, fmt, a...) \ |
2649 | ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a) | |
2650 | ||
2651 | #define EXT4_ERROR_INODE_BLOCK(inode, block, fmt, a...) \ | |
2652 | ext4_error_inode((inode), __func__, __LINE__, (block), (fmt), ## a) | |
2653 | ||
2654 | #define EXT4_ERROR_FILE(file, block, fmt, a...) \ | |
2655 | ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a) | |
2656 | ||
e7c96e8e JP |
2657 | #ifdef CONFIG_PRINTK |
2658 | ||
2659 | #define ext4_error_inode(inode, func, line, block, fmt, ...) \ | |
2660 | __ext4_error_inode(inode, func, line, block, fmt, ##__VA_ARGS__) | |
2661 | #define ext4_error_file(file, func, line, block, fmt, ...) \ | |
2662 | __ext4_error_file(file, func, line, block, fmt, ##__VA_ARGS__) | |
2663 | #define ext4_error(sb, fmt, ...) \ | |
2664 | __ext4_error(sb, __func__, __LINE__, fmt, ##__VA_ARGS__) | |
2665 | #define ext4_abort(sb, fmt, ...) \ | |
2666 | __ext4_abort(sb, __func__, __LINE__, fmt, ##__VA_ARGS__) | |
2667 | #define ext4_warning(sb, fmt, ...) \ | |
2668 | __ext4_warning(sb, __func__, __LINE__, fmt, ##__VA_ARGS__) | |
b03a2f7e AD |
2669 | #define ext4_warning_inode(inode, fmt, ...) \ |
2670 | __ext4_warning_inode(inode, __func__, __LINE__, fmt, ##__VA_ARGS__) | |
e7c96e8e JP |
2671 | #define ext4_msg(sb, level, fmt, ...) \ |
2672 | __ext4_msg(sb, level, fmt, ##__VA_ARGS__) | |
2673 | #define dump_mmp_msg(sb, mmp, msg) \ | |
2674 | __dump_mmp_msg(sb, mmp, __func__, __LINE__, msg) | |
2675 | #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \ | |
2676 | __ext4_grp_locked_error(__func__, __LINE__, sb, grp, ino, block, \ | |
2677 | fmt, ##__VA_ARGS__) | |
2678 | ||
2679 | #else | |
2680 | ||
2681 | #define ext4_error_inode(inode, func, line, block, fmt, ...) \ | |
2682 | do { \ | |
2683 | no_printk(fmt, ##__VA_ARGS__); \ | |
2684 | __ext4_error_inode(inode, "", 0, block, " "); \ | |
2685 | } while (0) | |
2686 | #define ext4_error_file(file, func, line, block, fmt, ...) \ | |
2687 | do { \ | |
2688 | no_printk(fmt, ##__VA_ARGS__); \ | |
2689 | __ext4_error_file(file, "", 0, block, " "); \ | |
2690 | } while (0) | |
2691 | #define ext4_error(sb, fmt, ...) \ | |
2692 | do { \ | |
2693 | no_printk(fmt, ##__VA_ARGS__); \ | |
2694 | __ext4_error(sb, "", 0, " "); \ | |
2695 | } while (0) | |
2696 | #define ext4_abort(sb, fmt, ...) \ | |
2697 | do { \ | |
2698 | no_printk(fmt, ##__VA_ARGS__); \ | |
2699 | __ext4_abort(sb, "", 0, " "); \ | |
2700 | } while (0) | |
2701 | #define ext4_warning(sb, fmt, ...) \ | |
2702 | do { \ | |
2703 | no_printk(fmt, ##__VA_ARGS__); \ | |
2704 | __ext4_warning(sb, "", 0, " "); \ | |
2705 | } while (0) | |
b03a2f7e AD |
2706 | #define ext4_warning_inode(inode, fmt, ...) \ |
2707 | do { \ | |
2708 | no_printk(fmt, ##__VA_ARGS__); \ | |
2709 | __ext4_warning_inode(inode, "", 0, " "); \ | |
2710 | } while (0) | |
e7c96e8e JP |
2711 | #define ext4_msg(sb, level, fmt, ...) \ |
2712 | do { \ | |
2713 | no_printk(fmt, ##__VA_ARGS__); \ | |
2714 | __ext4_msg(sb, "", " "); \ | |
2715 | } while (0) | |
2716 | #define dump_mmp_msg(sb, mmp, msg) \ | |
2717 | __dump_mmp_msg(sb, mmp, "", 0, "") | |
2718 | #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \ | |
2719 | do { \ | |
2720 | no_printk(fmt, ##__VA_ARGS__); \ | |
2721 | __ext4_grp_locked_error("", 0, sb, grp, ino, block, " "); \ | |
2722 | } while (0) | |
2723 | ||
2724 | #endif | |
2725 | ||
af5bc92d | 2726 | extern void ext4_update_dynamic_rev(struct super_block *sb); |
99e6f829 AK |
2727 | extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb, |
2728 | __u32 compat); | |
2729 | extern int ext4_update_rocompat_feature(handle_t *handle, | |
2730 | struct super_block *sb, __u32 rocompat); | |
2731 | extern int ext4_update_incompat_feature(handle_t *handle, | |
2732 | struct super_block *sb, __u32 incompat); | |
8fadc143 AR |
2733 | extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb, |
2734 | struct ext4_group_desc *bg); | |
2735 | extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb, | |
2736 | struct ext4_group_desc *bg); | |
2737 | extern ext4_fsblk_t ext4_inode_table(struct super_block *sb, | |
2738 | struct ext4_group_desc *bg); | |
021b65bb TT |
2739 | extern __u32 ext4_free_group_clusters(struct super_block *sb, |
2740 | struct ext4_group_desc *bg); | |
560671a0 AK |
2741 | extern __u32 ext4_free_inodes_count(struct super_block *sb, |
2742 | struct ext4_group_desc *bg); | |
2743 | extern __u32 ext4_used_dirs_count(struct super_block *sb, | |
2744 | struct ext4_group_desc *bg); | |
2745 | extern __u32 ext4_itable_unused_count(struct super_block *sb, | |
2746 | struct ext4_group_desc *bg); | |
8fadc143 AR |
2747 | extern void ext4_block_bitmap_set(struct super_block *sb, |
2748 | struct ext4_group_desc *bg, ext4_fsblk_t blk); | |
2749 | extern void ext4_inode_bitmap_set(struct super_block *sb, | |
2750 | struct ext4_group_desc *bg, ext4_fsblk_t blk); | |
2751 | extern void ext4_inode_table_set(struct super_block *sb, | |
2752 | struct ext4_group_desc *bg, ext4_fsblk_t blk); | |
021b65bb TT |
2753 | extern void ext4_free_group_clusters_set(struct super_block *sb, |
2754 | struct ext4_group_desc *bg, | |
2755 | __u32 count); | |
560671a0 AK |
2756 | extern void ext4_free_inodes_set(struct super_block *sb, |
2757 | struct ext4_group_desc *bg, __u32 count); | |
2758 | extern void ext4_used_dirs_set(struct super_block *sb, | |
2759 | struct ext4_group_desc *bg, __u32 count); | |
2760 | extern void ext4_itable_unused_set(struct super_block *sb, | |
2761 | struct ext4_group_desc *bg, __u32 count); | |
feb0ab32 | 2762 | extern int ext4_group_desc_csum_verify(struct super_block *sb, __u32 group, |
bb23c20a | 2763 | struct ext4_group_desc *gdp); |
feb0ab32 DW |
2764 | extern void ext4_group_desc_csum_set(struct super_block *sb, __u32 group, |
2765 | struct ext4_group_desc *gdp); | |
7f511862 TT |
2766 | extern int ext4_register_li_request(struct super_block *sb, |
2767 | ext4_group_t first_not_zeroed); | |
bd81d8ee | 2768 | |
41a246d1 DW |
2769 | static inline int ext4_has_group_desc_csum(struct super_block *sb) |
2770 | { | |
e2b911c5 DW |
2771 | return ext4_has_feature_gdt_csum(sb) || |
2772 | EXT4_SB(sb)->s_chksum_driver != NULL; | |
41a246d1 | 2773 | } |
bd81d8ee | 2774 | |
9aa5d32b DM |
2775 | static inline int ext4_has_metadata_csum(struct super_block *sb) |
2776 | { | |
e2b911c5 | 2777 | WARN_ON_ONCE(ext4_has_feature_metadata_csum(sb) && |
9aa5d32b DM |
2778 | !EXT4_SB(sb)->s_chksum_driver); |
2779 | ||
2780 | return (EXT4_SB(sb)->s_chksum_driver != NULL); | |
2781 | } | |
bd81d8ee LV |
2782 | static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es) |
2783 | { | |
2784 | return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) | | |
6bc9feff | 2785 | le32_to_cpu(es->s_blocks_count_lo); |
bd81d8ee LV |
2786 | } |
2787 | ||
2788 | static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es) | |
2789 | { | |
2790 | return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) | | |
308ba3ec | 2791 | le32_to_cpu(es->s_r_blocks_count_lo); |
bd81d8ee LV |
2792 | } |
2793 | ||
2794 | static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es) | |
2795 | { | |
2796 | return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) | | |
308ba3ec | 2797 | le32_to_cpu(es->s_free_blocks_count_lo); |
bd81d8ee LV |
2798 | } |
2799 | ||
2800 | static inline void ext4_blocks_count_set(struct ext4_super_block *es, | |
2801 | ext4_fsblk_t blk) | |
2802 | { | |
6bc9feff | 2803 | es->s_blocks_count_lo = cpu_to_le32((u32)blk); |
bd81d8ee LV |
2804 | es->s_blocks_count_hi = cpu_to_le32(blk >> 32); |
2805 | } | |
2806 | ||
2807 | static inline void ext4_free_blocks_count_set(struct ext4_super_block *es, | |
2808 | ext4_fsblk_t blk) | |
2809 | { | |
308ba3ec | 2810 | es->s_free_blocks_count_lo = cpu_to_le32((u32)blk); |
bd81d8ee LV |
2811 | es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32); |
2812 | } | |
2813 | ||
2814 | static inline void ext4_r_blocks_count_set(struct ext4_super_block *es, | |
2815 | ext4_fsblk_t blk) | |
2816 | { | |
308ba3ec | 2817 | es->s_r_blocks_count_lo = cpu_to_le32((u32)blk); |
bd81d8ee LV |
2818 | es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32); |
2819 | } | |
2820 | ||
a48380f7 AK |
2821 | static inline loff_t ext4_isize(struct ext4_inode *raw_inode) |
2822 | { | |
06a279d6 TT |
2823 | if (S_ISREG(le16_to_cpu(raw_inode->i_mode))) |
2824 | return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) | | |
2825 | le32_to_cpu(raw_inode->i_size_lo); | |
2826 | else | |
2827 | return (loff_t) le32_to_cpu(raw_inode->i_size_lo); | |
a48380f7 | 2828 | } |
bd81d8ee | 2829 | |
a48380f7 AK |
2830 | static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size) |
2831 | { | |
2832 | raw_inode->i_size_lo = cpu_to_le32(i_size); | |
2833 | raw_inode->i_size_high = cpu_to_le32(i_size >> 32); | |
2834 | } | |
ac27a0ec | 2835 | |
c9de560d AT |
2836 | static inline |
2837 | struct ext4_group_info *ext4_get_group_info(struct super_block *sb, | |
af5bc92d | 2838 | ext4_group_t group) |
c9de560d AT |
2839 | { |
2840 | struct ext4_group_info ***grp_info; | |
2841 | long indexv, indexh; | |
2f2e09eb | 2842 | BUG_ON(group >= EXT4_SB(sb)->s_groups_count); |
c9de560d AT |
2843 | grp_info = EXT4_SB(sb)->s_group_info; |
2844 | indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb)); | |
2845 | indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1); | |
2846 | return grp_info[indexv][indexh]; | |
2847 | } | |
2848 | ||
8df9675f TT |
2849 | /* |
2850 | * Reading s_groups_count requires using smp_rmb() afterwards. See | |
2851 | * the locking protocol documented in the comments of ext4_group_add() | |
2852 | * in resize.c | |
2853 | */ | |
2854 | static inline ext4_group_t ext4_get_groups_count(struct super_block *sb) | |
2855 | { | |
2856 | ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count; | |
2857 | ||
2858 | smp_rmb(); | |
2859 | return ngroups; | |
2860 | } | |
c9de560d | 2861 | |
772cb7c8 JS |
2862 | static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi, |
2863 | ext4_group_t block_group) | |
2864 | { | |
2865 | return block_group >> sbi->s_log_groups_per_flex; | |
2866 | } | |
2867 | ||
2868 | static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi) | |
2869 | { | |
2870 | return 1 << sbi->s_log_groups_per_flex; | |
2871 | } | |
2872 | ||
617ba13b | 2873 | #define ext4_std_error(sb, errno) \ |
ac27a0ec DK |
2874 | do { \ |
2875 | if ((errno)) \ | |
c398eda0 | 2876 | __ext4_std_error((sb), __func__, __LINE__, (errno)); \ |
ac27a0ec DK |
2877 | } while (0) |
2878 | ||
a30d542a | 2879 | #ifdef CONFIG_SMP |
df55c99d TT |
2880 | /* Each CPU can accumulate percpu_counter_batch clusters in their local |
2881 | * counters. So we need to make sure we have free clusters more | |
179f7ebf | 2882 | * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times. |
a30d542a | 2883 | */ |
df55c99d | 2884 | #define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids)) |
a30d542a | 2885 | #else |
df55c99d | 2886 | #define EXT4_FREECLUSTERS_WATERMARK 0 |
a30d542a AK |
2887 | #endif |
2888 | ||
90e775b7 | 2889 | /* Update i_disksize. Requires i_mutex to avoid races with truncate */ |
cf17fea6 AK |
2890 | static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize) |
2891 | { | |
90e775b7 | 2892 | WARN_ON_ONCE(S_ISREG(inode->i_mode) && |
5955102c | 2893 | !inode_is_locked(inode)); |
90e775b7 JK |
2894 | down_write(&EXT4_I(inode)->i_data_sem); |
2895 | if (newsize > EXT4_I(inode)->i_disksize) | |
2896 | EXT4_I(inode)->i_disksize = newsize; | |
2897 | up_write(&EXT4_I(inode)->i_data_sem); | |
2898 | } | |
2899 | ||
4631dbf6 DM |
2900 | /* Update i_size, i_disksize. Requires i_mutex to avoid races with truncate */ |
2901 | static inline int ext4_update_inode_size(struct inode *inode, loff_t newsize) | |
2902 | { | |
2903 | int changed = 0; | |
2904 | ||
2905 | if (newsize > inode->i_size) { | |
2906 | i_size_write(inode, newsize); | |
2907 | changed = 1; | |
2908 | } | |
2909 | if (newsize > EXT4_I(inode)->i_disksize) { | |
2910 | ext4_update_i_disksize(inode, newsize); | |
2911 | changed |= 2; | |
2912 | } | |
2913 | return changed; | |
2914 | } | |
2915 | ||
01127848 JK |
2916 | int ext4_update_disksize_before_punch(struct inode *inode, loff_t offset, |
2917 | loff_t len); | |
2918 | ||
5d1b1b3f AK |
2919 | struct ext4_group_info { |
2920 | unsigned long bb_state; | |
2921 | struct rb_root bb_free_root; | |
a36b4498 ES |
2922 | ext4_grpblk_t bb_first_free; /* first free block */ |
2923 | ext4_grpblk_t bb_free; /* total free blocks */ | |
2924 | ext4_grpblk_t bb_fragments; /* nr of freespace fragments */ | |
8a57d9d6 | 2925 | ext4_grpblk_t bb_largest_free_order;/* order of largest frag in BG */ |
5d1b1b3f AK |
2926 | struct list_head bb_prealloc_list; |
2927 | #ifdef DOUBLE_CHECK | |
2928 | void *bb_bitmap; | |
2929 | #endif | |
2930 | struct rw_semaphore alloc_sem; | |
a36b4498 ES |
2931 | ext4_grpblk_t bb_counters[]; /* Nr of free power-of-two-block |
2932 | * regions, index is order. | |
2933 | * bb_counters[3] = 5 means | |
2934 | * 5 free 8-block regions. */ | |
5d1b1b3f AK |
2935 | }; |
2936 | ||
3d56b8d2 TM |
2937 | #define EXT4_GROUP_INFO_NEED_INIT_BIT 0 |
2938 | #define EXT4_GROUP_INFO_WAS_TRIMMED_BIT 1 | |
163a203d | 2939 | #define EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT 2 |
87a39389 | 2940 | #define EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT 3 |
5d1b1b3f AK |
2941 | |
2942 | #define EXT4_MB_GRP_NEED_INIT(grp) \ | |
2943 | (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state))) | |
163a203d DW |
2944 | #define EXT4_MB_GRP_BBITMAP_CORRUPT(grp) \ |
2945 | (test_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &((grp)->bb_state))) | |
87a39389 DW |
2946 | #define EXT4_MB_GRP_IBITMAP_CORRUPT(grp) \ |
2947 | (test_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &((grp)->bb_state))) | |
5d1b1b3f | 2948 | |
3d56b8d2 TM |
2949 | #define EXT4_MB_GRP_WAS_TRIMMED(grp) \ |
2950 | (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) | |
2951 | #define EXT4_MB_GRP_SET_TRIMMED(grp) \ | |
2952 | (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) | |
2953 | #define EXT4_MB_GRP_CLEAR_TRIMMED(grp) \ | |
2954 | (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) | |
2955 | ||
50797481 TT |
2956 | #define EXT4_MAX_CONTENTION 8 |
2957 | #define EXT4_CONTENTION_THRESHOLD 2 | |
2958 | ||
955ce5f5 AK |
2959 | static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb, |
2960 | ext4_group_t group) | |
5d1b1b3f | 2961 | { |
955ce5f5 AK |
2962 | return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group); |
2963 | } | |
5d1b1b3f | 2964 | |
50797481 TT |
2965 | /* |
2966 | * Returns true if the filesystem is busy enough that attempts to | |
2967 | * access the block group locks has run into contention. | |
2968 | */ | |
2969 | static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi) | |
2970 | { | |
2971 | return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD); | |
2972 | } | |
2973 | ||
955ce5f5 AK |
2974 | static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group) |
2975 | { | |
50797481 TT |
2976 | spinlock_t *lock = ext4_group_lock_ptr(sb, group); |
2977 | if (spin_trylock(lock)) | |
2978 | /* | |
2979 | * We're able to grab the lock right away, so drop the | |
2980 | * lock contention counter. | |
2981 | */ | |
2982 | atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0); | |
2983 | else { | |
2984 | /* | |
2985 | * The lock is busy, so bump the contention counter, | |
2986 | * and then wait on the spin lock. | |
2987 | */ | |
2988 | atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1, | |
2989 | EXT4_MAX_CONTENTION); | |
2990 | spin_lock(lock); | |
2991 | } | |
5d1b1b3f AK |
2992 | } |
2993 | ||
2994 | static inline void ext4_unlock_group(struct super_block *sb, | |
2995 | ext4_group_t group) | |
2996 | { | |
955ce5f5 | 2997 | spin_unlock(ext4_group_lock_ptr(sb, group)); |
5d1b1b3f AK |
2998 | } |
2999 | ||
1f7d1e77 TT |
3000 | /* |
3001 | * Block validity checking | |
3002 | */ | |
3003 | #define ext4_check_indirect_blockref(inode, bh) \ | |
3004 | ext4_check_blockref(__func__, __LINE__, inode, \ | |
3005 | (__le32 *)(bh)->b_data, \ | |
3006 | EXT4_ADDR_PER_BLOCK((inode)->i_sb)) | |
3007 | ||
3008 | #define ext4_ind_check_inode(inode) \ | |
3009 | ext4_check_blockref(__func__, __LINE__, inode, \ | |
3010 | EXT4_I(inode)->i_data, \ | |
3011 | EXT4_NDIR_BLOCKS) | |
3012 | ||
ac27a0ec DK |
3013 | /* |
3014 | * Inodes and files operations | |
3015 | */ | |
3016 | ||
3017 | /* dir.c */ | |
617ba13b | 3018 | extern const struct file_operations ext4_dir_operations; |
ac27a0ec DK |
3019 | |
3020 | /* file.c */ | |
c5ef1c42 | 3021 | extern const struct inode_operations ext4_file_inode_operations; |
617ba13b | 3022 | extern const struct file_operations ext4_file_operations; |
e0d10bfa | 3023 | extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin); |
ac27a0ec | 3024 | |
95eaefbd | 3025 | /* inline.c */ |
95eaefbd TT |
3026 | extern int ext4_get_max_inline_size(struct inode *inode); |
3027 | extern int ext4_find_inline_data_nolock(struct inode *inode); | |
95eaefbd TT |
3028 | extern int ext4_init_inline_data(handle_t *handle, struct inode *inode, |
3029 | unsigned int len); | |
3030 | extern int ext4_destroy_inline_data(handle_t *handle, struct inode *inode); | |
3031 | ||
3032 | extern int ext4_readpage_inline(struct inode *inode, struct page *page); | |
3033 | extern int ext4_try_to_write_inline_data(struct address_space *mapping, | |
3034 | struct inode *inode, | |
3035 | loff_t pos, unsigned len, | |
3036 | unsigned flags, | |
3037 | struct page **pagep); | |
3038 | extern int ext4_write_inline_data_end(struct inode *inode, | |
3039 | loff_t pos, unsigned len, | |
3040 | unsigned copied, | |
3041 | struct page *page); | |
3042 | extern struct buffer_head * | |
3043 | ext4_journalled_write_inline_data(struct inode *inode, | |
3044 | unsigned len, | |
3045 | struct page *page); | |
3046 | extern int ext4_da_write_inline_data_begin(struct address_space *mapping, | |
3047 | struct inode *inode, | |
3048 | loff_t pos, unsigned len, | |
3049 | unsigned flags, | |
3050 | struct page **pagep, | |
3051 | void **fsdata); | |
3052 | extern int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos, | |
3053 | unsigned len, unsigned copied, | |
3054 | struct page *page); | |
5b643f9c TT |
3055 | extern int ext4_try_add_inline_entry(handle_t *handle, |
3056 | struct ext4_filename *fname, | |
56a04915 | 3057 | struct inode *dir, struct inode *inode); |
95eaefbd TT |
3058 | extern int ext4_try_create_inline_dir(handle_t *handle, |
3059 | struct inode *parent, | |
3060 | struct inode *inode); | |
3061 | extern int ext4_read_inline_dir(struct file *filp, | |
725bebb2 | 3062 | struct dir_context *ctx, |
95eaefbd | 3063 | int *has_inline_data); |
8af0f082 TM |
3064 | extern int htree_inlinedir_to_tree(struct file *dir_file, |
3065 | struct inode *dir, ext4_lblk_t block, | |
3066 | struct dx_hash_info *hinfo, | |
3067 | __u32 start_hash, __u32 start_minor_hash, | |
3068 | int *has_inline_data); | |
95eaefbd | 3069 | extern struct buffer_head *ext4_find_inline_entry(struct inode *dir, |
5b643f9c | 3070 | struct ext4_filename *fname, |
95eaefbd TT |
3071 | const struct qstr *d_name, |
3072 | struct ext4_dir_entry_2 **res_dir, | |
3073 | int *has_inline_data); | |
3074 | extern int ext4_delete_inline_entry(handle_t *handle, | |
3075 | struct inode *dir, | |
3076 | struct ext4_dir_entry_2 *de_del, | |
3077 | struct buffer_head *bh, | |
3078 | int *has_inline_data); | |
3079 | extern int empty_inline_dir(struct inode *dir, int *has_inline_data); | |
3080 | extern struct buffer_head *ext4_get_first_inline_block(struct inode *inode, | |
3081 | struct ext4_dir_entry_2 **parent_de, | |
3082 | int *retval); | |
3083 | extern int ext4_inline_data_fiemap(struct inode *inode, | |
3084 | struct fiemap_extent_info *fieinfo, | |
d952d69e | 3085 | int *has_inline, __u64 start, __u64 len); |
95eaefbd TT |
3086 | extern int ext4_try_to_evict_inline_data(handle_t *handle, |
3087 | struct inode *inode, | |
3088 | int needed); | |
3089 | extern void ext4_inline_data_truncate(struct inode *inode, int *has_inline); | |
3090 | ||
3091 | extern int ext4_convert_inline_data(struct inode *inode); | |
3092 | ||
83447ccb ZL |
3093 | static inline int ext4_has_inline_data(struct inode *inode) |
3094 | { | |
3095 | return ext4_test_inode_flag(inode, EXT4_INODE_INLINE_DATA) && | |
3096 | EXT4_I(inode)->i_inline_off; | |
3097 | } | |
3098 | ||
ac27a0ec | 3099 | /* namei.c */ |
c5ef1c42 AV |
3100 | extern const struct inode_operations ext4_dir_inode_operations; |
3101 | extern const struct inode_operations ext4_special_inode_operations; | |
596397b7 | 3102 | extern struct dentry *ext4_get_parent(struct dentry *child); |
a774f9c2 TM |
3103 | extern struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode, |
3104 | struct ext4_dir_entry_2 *de, | |
3105 | int blocksize, int csum_size, | |
3106 | unsigned int parent_ino, int dotdot_real_len); | |
3c47d541 TM |
3107 | extern void initialize_dirent_tail(struct ext4_dir_entry_tail *t, |
3108 | unsigned int blocksize); | |
3109 | extern int ext4_handle_dirty_dirent_node(handle_t *handle, | |
3110 | struct inode *inode, | |
3111 | struct buffer_head *bh); | |
8af0f082 TM |
3112 | #define S_SHIFT 12 |
3113 | static unsigned char ext4_type_by_mode[S_IFMT >> S_SHIFT] = { | |
3114 | [S_IFREG >> S_SHIFT] = EXT4_FT_REG_FILE, | |
3115 | [S_IFDIR >> S_SHIFT] = EXT4_FT_DIR, | |
3116 | [S_IFCHR >> S_SHIFT] = EXT4_FT_CHRDEV, | |
3117 | [S_IFBLK >> S_SHIFT] = EXT4_FT_BLKDEV, | |
3118 | [S_IFIFO >> S_SHIFT] = EXT4_FT_FIFO, | |
3119 | [S_IFSOCK >> S_SHIFT] = EXT4_FT_SOCK, | |
3120 | [S_IFLNK >> S_SHIFT] = EXT4_FT_SYMLINK, | |
3121 | }; | |
3122 | ||
3123 | static inline void ext4_set_de_type(struct super_block *sb, | |
3124 | struct ext4_dir_entry_2 *de, | |
3125 | umode_t mode) { | |
e2b911c5 | 3126 | if (ext4_has_feature_filetype(sb)) |
8af0f082 TM |
3127 | de->file_type = ext4_type_by_mode[(mode & S_IFMT)>>S_SHIFT]; |
3128 | } | |
3129 | ||
f64e02fe TT |
3130 | /* readpages.c */ |
3131 | extern int ext4_mpage_readpages(struct address_space *mapping, | |
3132 | struct list_head *pages, struct page *page, | |
3133 | unsigned nr_pages); | |
ac27a0ec DK |
3134 | |
3135 | /* symlink.c */ | |
a7a67e8a | 3136 | extern const struct inode_operations ext4_encrypted_symlink_inode_operations; |
c5ef1c42 AV |
3137 | extern const struct inode_operations ext4_symlink_inode_operations; |
3138 | extern const struct inode_operations ext4_fast_symlink_inode_operations; | |
ac27a0ec | 3139 | |
b5799018 TT |
3140 | /* sysfs.c */ |
3141 | extern int ext4_register_sysfs(struct super_block *sb); | |
ebd173be | 3142 | extern void ext4_unregister_sysfs(struct super_block *sb); |
b5799018 TT |
3143 | extern int __init ext4_init_sysfs(void); |
3144 | extern void ext4_exit_sysfs(void); | |
3145 | ||
6fd058f7 TT |
3146 | /* block_validity */ |
3147 | extern void ext4_release_system_zone(struct super_block *sb); | |
3148 | extern int ext4_setup_system_zone(struct super_block *sb); | |
5dabfc78 TT |
3149 | extern int __init ext4_init_system_zone(void); |
3150 | extern void ext4_exit_system_zone(void); | |
6fd058f7 TT |
3151 | extern int ext4_data_block_valid(struct ext4_sb_info *sbi, |
3152 | ext4_fsblk_t start_blk, | |
3153 | unsigned int count); | |
1f7d1e77 TT |
3154 | extern int ext4_check_blockref(const char *, unsigned int, |
3155 | struct inode *, __le32 *, unsigned int); | |
6fd058f7 | 3156 | |
a86c6181 | 3157 | /* extents.c */ |
4a092d73 TT |
3158 | struct ext4_ext_path; |
3159 | struct ext4_extent; | |
3160 | ||
d7b2a00c ZL |
3161 | /* |
3162 | * Maximum number of logical blocks in a file; ext4_extent's ee_block is | |
3163 | * __le32. | |
3164 | */ | |
3165 | #define EXT_MAX_BLOCKS 0xffffffff | |
3166 | ||
a86c6181 AT |
3167 | extern int ext4_ext_tree_init(handle_t *handle, struct inode *); |
3168 | extern int ext4_ext_writepage_trans_blocks(struct inode *, int); | |
fffb2739 | 3169 | extern int ext4_ext_index_trans_blocks(struct inode *inode, int extents); |
e35fd660 TT |
3170 | extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode, |
3171 | struct ext4_map_blocks *map, int flags); | |
819c4920 | 3172 | extern void ext4_ext_truncate(handle_t *, struct inode *); |
26a4c0c6 TT |
3173 | extern int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start, |
3174 | ext4_lblk_t end); | |
a86c6181 AT |
3175 | extern void ext4_ext_init(struct super_block *); |
3176 | extern void ext4_ext_release(struct super_block *); | |
2fe17c10 | 3177 | extern long ext4_fallocate(struct file *file, int mode, loff_t offset, |
a2df2a63 | 3178 | loff_t len); |
6b523df4 JK |
3179 | extern int ext4_convert_unwritten_extents(handle_t *handle, struct inode *inode, |
3180 | loff_t offset, ssize_t len); | |
e35fd660 TT |
3181 | extern int ext4_map_blocks(handle_t *handle, struct inode *inode, |
3182 | struct ext4_map_blocks *map, int flags); | |
4a092d73 TT |
3183 | extern int ext4_ext_calc_metadata_amount(struct inode *inode, |
3184 | ext4_lblk_t lblocks); | |
4a092d73 TT |
3185 | extern int ext4_ext_calc_credits_for_single_extent(struct inode *inode, |
3186 | int num, | |
3187 | struct ext4_ext_path *path); | |
3188 | extern int ext4_can_extents_be_merged(struct inode *inode, | |
3189 | struct ext4_extent *ex1, | |
3190 | struct ext4_extent *ex2); | |
3191 | extern int ext4_ext_insert_extent(handle_t *, struct inode *, | |
dfe50809 | 3192 | struct ext4_ext_path **, |
4a092d73 | 3193 | struct ext4_extent *, int); |
ed8a1a76 TT |
3194 | extern struct ext4_ext_path *ext4_find_extent(struct inode *, ext4_lblk_t, |
3195 | struct ext4_ext_path **, | |
3196 | int flags); | |
4a092d73 TT |
3197 | extern void ext4_ext_drop_refs(struct ext4_ext_path *); |
3198 | extern int ext4_ext_check_inode(struct inode *inode); | |
f7fec032 ZL |
3199 | extern int ext4_find_delalloc_range(struct inode *inode, |
3200 | ext4_lblk_t lblk_start, | |
3201 | ext4_lblk_t lblk_end); | |
4a092d73 | 3202 | extern int ext4_find_delalloc_cluster(struct inode *inode, ext4_lblk_t lblk); |
fcf6b1b7 | 3203 | extern ext4_lblk_t ext4_ext_next_allocated_block(struct ext4_ext_path *path); |
3a06d778 AK |
3204 | extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, |
3205 | __u64 start, __u64 len); | |
7869a4a6 | 3206 | extern int ext4_ext_precache(struct inode *inode); |
9eb79482 | 3207 | extern int ext4_collapse_range(struct inode *inode, loff_t offset, loff_t len); |
331573fe | 3208 | extern int ext4_insert_range(struct inode *inode, loff_t offset, loff_t len); |
fcf6b1b7 DM |
3209 | extern int ext4_swap_extents(handle_t *handle, struct inode *inode1, |
3210 | struct inode *inode2, ext4_lblk_t lblk1, | |
3211 | ext4_lblk_t lblk2, ext4_lblk_t count, | |
3212 | int mark_unwritten,int *err); | |
4a092d73 | 3213 | |
748de673 | 3214 | /* move_extent.c */ |
393d1d1d DTB |
3215 | extern void ext4_double_down_write_data_sem(struct inode *first, |
3216 | struct inode *second); | |
3217 | extern void ext4_double_up_write_data_sem(struct inode *orig_inode, | |
3218 | struct inode *donor_inode); | |
748de673 AF |
3219 | extern int ext4_move_extents(struct file *o_filp, struct file *d_filp, |
3220 | __u64 start_orig, __u64 start_donor, | |
3221 | __u64 len, __u64 *moved_len); | |
3222 | ||
bd2d0210 | 3223 | /* page-io.c */ |
5dabfc78 TT |
3224 | extern int __init ext4_init_pageio(void); |
3225 | extern void ext4_exit_pageio(void); | |
bd2d0210 | 3226 | extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags); |
97a851ed JK |
3227 | extern ext4_io_end_t *ext4_get_io_end(ext4_io_end_t *io_end); |
3228 | extern int ext4_put_io_end(ext4_io_end_t *io_end); | |
3229 | extern void ext4_put_io_end_defer(ext4_io_end_t *io_end); | |
3230 | extern void ext4_io_submit_init(struct ext4_io_submit *io, | |
3231 | struct writeback_control *wbc); | |
2e8fa54e | 3232 | extern void ext4_end_io_rsv_work(struct work_struct *work); |
bd2d0210 TT |
3233 | extern void ext4_io_submit(struct ext4_io_submit *io); |
3234 | extern int ext4_bio_write_page(struct ext4_io_submit *io, | |
3235 | struct page *page, | |
3236 | int len, | |
1c8349a1 NJ |
3237 | struct writeback_control *wbc, |
3238 | bool keep_towrite); | |
3a06d778 | 3239 | |
c5e06d10 JL |
3240 | /* mmp.c */ |
3241 | extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t); | |
3242 | ||
2ccb5fb9 | 3243 | /* |
48fc7f7e | 3244 | * Add new method to test whether block and inode bitmaps are properly |
2ccb5fb9 AK |
3245 | * initialized. With uninit_bg reading the block from disk is not enough |
3246 | * to mark the bitmap uptodate. We need to also zero-out the bitmap | |
3247 | */ | |
3248 | #define BH_BITMAP_UPTODATE BH_JBDPrivateStart | |
3249 | ||
3250 | static inline int bitmap_uptodate(struct buffer_head *bh) | |
3251 | { | |
3252 | return (buffer_uptodate(bh) && | |
3253 | test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state)); | |
3254 | } | |
3255 | static inline void set_bitmap_uptodate(struct buffer_head *bh) | |
3256 | { | |
3257 | set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state); | |
3258 | } | |
3259 | ||
17335dcc DM |
3260 | /* |
3261 | * Disable DIO read nolock optimization, so new dioreaders will be forced | |
3262 | * to grab i_mutex | |
3263 | */ | |
3264 | static inline void ext4_inode_block_unlocked_dio(struct inode *inode) | |
3265 | { | |
3266 | ext4_set_inode_state(inode, EXT4_STATE_DIOREAD_LOCK); | |
3267 | smp_mb(); | |
3268 | } | |
3269 | static inline void ext4_inode_resume_unlocked_dio(struct inode *inode) | |
3270 | { | |
3271 | smp_mb(); | |
3272 | ext4_clear_inode_state(inode, EXT4_STATE_DIOREAD_LOCK); | |
3273 | } | |
3274 | ||
731eb1a0 AM |
3275 | #define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1) |
3276 | ||
e9e3bcec ES |
3277 | /* For ioend & aio unwritten conversion wait queues */ |
3278 | #define EXT4_WQ_HASH_SZ 37 | |
3279 | #define ext4_ioend_wq(v) (&ext4__ioend_wq[((unsigned long)(v)) %\ | |
3280 | EXT4_WQ_HASH_SZ]) | |
e9e3bcec | 3281 | extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ]; |
e9e3bcec | 3282 | |
8f82f840 YY |
3283 | #define EXT4_RESIZING 0 |
3284 | extern int ext4_resize_begin(struct super_block *sb); | |
3285 | extern void ext4_resize_end(struct super_block *sb); | |
3286 | ||
74c66bcb JK |
3287 | static inline void ext4_set_io_unwritten_flag(struct inode *inode, |
3288 | struct ext4_io_end *io_end) | |
3289 | { | |
3290 | if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) { | |
3291 | io_end->flag |= EXT4_IO_END_UNWRITTEN; | |
3292 | atomic_inc(&EXT4_I(inode)->i_unwritten); | |
3293 | } | |
3294 | } | |
3295 | ||
3296 | static inline void ext4_clear_io_unwritten_flag(ext4_io_end_t *io_end) | |
3297 | { | |
3298 | struct inode *inode = io_end->inode; | |
3299 | ||
3300 | if (io_end->flag & EXT4_IO_END_UNWRITTEN) { | |
3301 | io_end->flag &= ~EXT4_IO_END_UNWRITTEN; | |
3302 | /* Wake up anyone waiting on unwritten extent conversion */ | |
3303 | if (atomic_dec_and_test(&EXT4_I(inode)->i_unwritten)) | |
3304 | wake_up_all(ext4_ioend_wq(inode)); | |
3305 | } | |
3306 | } | |
3307 | ||
ac27a0ec DK |
3308 | #endif /* __KERNEL__ */ |
3309 | ||
6a797d27 DW |
3310 | #define EFSBADCRC EBADMSG /* Bad CRC detected */ |
3311 | #define EFSCORRUPTED EUCLEAN /* Filesystem is corrupted */ | |
3312 | ||
3dcf5451 | 3313 | #endif /* _EXT4_H */ |