1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* |
3 | * ext4.h |
4 | * |
5 | * Copyright (C) 1992, 1993, 1994, 1995 |
6 | * Remy Card (card@masi.ibp.fr) |
7 | * Laboratoire MASI - Institut Blaise Pascal |
8 | * Universite Pierre et Marie Curie (Paris VI) |
9 | * |
10 | * from |
11 | * |
12 | * linux/include/linux/minix_fs.h |
13 | * |
14 | * Copyright (C) 1991, 1992 Linus Torvalds |
15 | */ |
16 | |
17 | #ifndef _EXT4_H |
18 | #define _EXT4_H |
19 | |
20 | #include <linux/types.h> |
21 | #include <linux/blkdev.h> |
22 | #include <linux/magic.h> |
23 | #include <linux/jbd2.h> |
24 | #include <linux/quota.h> |
25 | #include <linux/rwsem.h> |
26 | #include <linux/rbtree.h> |
27 | #include <linux/seqlock.h> |
28 | #include <linux/mutex.h> |
29 | #include <linux/timer.h> |
30 | #include <linux/version.h> |
31 | #include <linux/wait.h> |
32 | #include <linux/sched/signal.h> |
33 | #include <linux/blockgroup_lock.h> |
34 | #include <linux/percpu_counter.h> |
35 | #include <linux/ratelimit.h> |
36 | #include <crypto/hash.h> |
37 | #include <linux/falloc.h> |
38 | #include <linux/percpu-rwsem.h> |
39 | #ifdef __KERNEL__ |
40 | #include <linux/compat.h> |
41 | #endif |
42 | |
43 | #include <linux/fscrypt.h> |
44 | |
45 | #include <linux/compiler.h> |
46 | |
47 | /* |
48 | * The fourth extended filesystem constants/structures |
49 | */ |
50 | |
51 | /* |
52 | * with AGGRESSIVE_CHECK allocator runs consistency checks over |
53 | * structures. these checks slow things down a lot |
54 | */ |
55 | #define AGGRESSIVE_CHECK__ |
56 | |
57 | /* |
58 | * with DOUBLE_CHECK defined mballoc creates persistent in-core |
59 | * bitmaps, maintains and uses them to check for double allocations |
60 | */ |
61 | #define DOUBLE_CHECK__ |
62 | |
63 | /* |
64 | * Define EXT4FS_DEBUG to produce debug messages |
65 | */ |
66 | #undef EXT4FS_DEBUG |
67 | |
68 | /* |
69 | * Debug code |
70 | */ |
71 | #ifdef EXT4FS_DEBUG |
72 | #define ext4_debug(f, a...) \ |
73 | do { \ |
74 | printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \ |
75 | __FILE__, __LINE__, __func__); \ |
76 | printk(KERN_DEBUG f, ## a); \ |
77 | } while (0) |
78 | #else |
79 | #define ext4_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__) |
80 | #endif |
81 | |
82 | /* |
83 | * Turn on EXT_DEBUG to get lots of info about extents operations. |
84 | */ |
85 | #define EXT_DEBUG__ |
86 | #ifdef EXT_DEBUG |
87 | #define ext_debug(fmt, ...) printk(fmt, ##__VA_ARGS__) |
88 | #else |
89 | #define ext_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__) |
90 | #endif |
91 | |
92 | /* data type for block offset of block group */ |
93 | typedef int ext4_grpblk_t; |
94 | |
95 | /* data type for filesystem-wide blocks number */ |
96 | typedef unsigned long long ext4_fsblk_t; |
97 | |
98 | /* data type for file logical block number */ |
99 | typedef __u32 ext4_lblk_t; |
100 | |
101 | /* data type for block group number */ |
102 | typedef unsigned int ext4_group_t; |
103 | |
104 | enum SHIFT_DIRECTION { |
105 | SHIFT_LEFT = 0, |
106 | SHIFT_RIGHT, |
107 | }; |
108 | |
109 | /* |
110 | * Flags used in mballoc's allocation_context flags field. |
111 | * |
112 | * Also used to show what's going on for debugging purposes when the |
113 | * flag field is exported via the traceport interface |
114 | */ |
115 | |
116 | /* prefer goal again. length */ |
117 | #define EXT4_MB_HINT_MERGE 0x0001 |
118 | /* blocks already reserved */ |
119 | #define EXT4_MB_HINT_RESERVED 0x0002 |
120 | /* metadata is being allocated */ |
121 | #define EXT4_MB_HINT_METADATA 0x0004 |
122 | /* first blocks in the file */ |
123 | #define EXT4_MB_HINT_FIRST 0x0008 |
124 | /* search for the best chunk */ |
125 | #define EXT4_MB_HINT_BEST 0x0010 |
126 | /* data is being allocated */ |
127 | #define EXT4_MB_HINT_DATA 0x0020 |
128 | /* don't preallocate (for tails) */ |
129 | #define EXT4_MB_HINT_NOPREALLOC 0x0040 |
130 | /* allocate for locality group */ |
131 | #define EXT4_MB_HINT_GROUP_ALLOC 0x0080 |
132 | /* allocate goal blocks or none */ |
133 | #define EXT4_MB_HINT_GOAL_ONLY 0x0100 |
134 | /* goal is meaningful */ |
135 | #define EXT4_MB_HINT_TRY_GOAL 0x0200 |
136 | /* blocks already pre-reserved by delayed allocation */ |
137 | #define EXT4_MB_DELALLOC_RESERVED 0x0400 |
138 | /* We are doing stream allocation */ |
139 | #define EXT4_MB_STREAM_ALLOC 0x0800 |
140 | /* Use reserved root blocks if needed */ |
141 | #define EXT4_MB_USE_ROOT_BLOCKS 0x1000 |
142 | /* Use blocks from reserved pool */ |
143 | #define EXT4_MB_USE_RESERVED 0x2000 |
144 | |
145 | struct ext4_allocation_request { |
146 | /* target inode for block we're allocating */ |
147 | struct inode *inode; |
148 | /* how many blocks we want to allocate */ |
149 | unsigned int len; |
150 | /* logical block in target inode */ |
151 | ext4_lblk_t logical; |
152 | /* the closest logical allocated block to the left */ |
153 | ext4_lblk_t lleft; |
154 | /* the closest logical allocated block to the right */ |
155 | ext4_lblk_t lright; |
156 | /* phys. target (a hint) */ |
157 | ext4_fsblk_t goal; |
158 | /* phys. block for the closest logical allocated block to the left */ |
159 | ext4_fsblk_t pleft; |
160 | /* phys. block for the closest logical allocated block to the right */ |
161 | ext4_fsblk_t pright; |
162 | /* flags. see above EXT4_MB_HINT_* */ |
163 | unsigned int flags; |
164 | }; |
165 | |
166 | /* |
167 | * Logical to physical block mapping, used by ext4_map_blocks() |
168 | * |
169 | * This structure is used to pass requests into ext4_map_blocks() as |
170 | * well as to store the information returned by ext4_map_blocks(). It |
171 | * takes less room on the stack than a struct buffer_head. |
172 | */ |
173 | #define EXT4_MAP_NEW (1 << BH_New) |
174 | #define EXT4_MAP_MAPPED (1 << BH_Mapped) |
175 | #define EXT4_MAP_UNWRITTEN (1 << BH_Unwritten) |
176 | #define EXT4_MAP_BOUNDARY (1 << BH_Boundary) |
177 | #define EXT4_MAP_FLAGS (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\ |
178 | EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY) |
179 | |
180 | struct ext4_map_blocks { |
181 | ext4_fsblk_t m_pblk; |
182 | ext4_lblk_t m_lblk; |
183 | unsigned int m_len; |
184 | unsigned int m_flags; |
185 | }; |
186 | |
187 | /* |
188 | * Flags for ext4_io_end->flags |
189 | */ |
190 | #define EXT4_IO_END_UNWRITTEN 0x0001 |
191 | |
192 | /* |
193 | * For converting unwritten extents on a work queue. 'handle' is used for |
194 | * buffered writeback. |
195 | */ |
196 | typedef struct ext4_io_end { |
197 | struct list_head list; /* per-file finished IO list */ |
198 | handle_t *handle; /* handle reserved for extent |
199 | * conversion */ |
200 | struct inode *inode; /* file being written to */ |
201 | struct bio *bio; /* Linked list of completed |
202 | * bios covering the extent */ |
203 | unsigned int flag; /* unwritten or not */ |
204 | atomic_t count; /* reference counter */ |
205 | loff_t offset; /* offset in the file */ |
206 | ssize_t size; /* size of the extent */ |
207 | } ext4_io_end_t; |
208 | |
209 | struct ext4_io_submit { |
210 | struct writeback_control *io_wbc; |
211 | struct bio *io_bio; |
212 | ext4_io_end_t *io_end; |
213 | sector_t io_next_block; |
214 | }; |
215 | |
216 | /* |
217 | * Special inodes numbers |
218 | */ |
219 | #define EXT4_BAD_INO 1 /* Bad blocks inode */ |
220 | #define EXT4_ROOT_INO 2 /* Root inode */ |
221 | #define EXT4_USR_QUOTA_INO 3 /* User quota inode */ |
222 | #define EXT4_GRP_QUOTA_INO 4 /* Group quota inode */ |
223 | #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */ |
224 | #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */ |
225 | #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */ |
226 | #define EXT4_JOURNAL_INO 8 /* Journal inode */ |
227 | |
228 | /* First non-reserved inode for old ext4 filesystems */ |
229 | #define EXT4_GOOD_OLD_FIRST_INO 11 |
230 | |
231 | /* |
232 | * Maximal count of links to a file |
233 | */ |
234 | #define EXT4_LINK_MAX 65000 |
235 | |
236 | /* |
237 | * Macro-instructions used to manage several block sizes |
238 | */ |
239 | #define EXT4_MIN_BLOCK_SIZE 1024 |
240 | #define EXT4_MAX_BLOCK_SIZE 65536 |
241 | #define EXT4_MIN_BLOCK_LOG_SIZE 10 |
242 | #define EXT4_MAX_BLOCK_LOG_SIZE 16 |
243 | #define EXT4_MAX_CLUSTER_LOG_SIZE 30 |
244 | #ifdef __KERNEL__ |
245 | # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize) |
246 | #else |
247 | # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size) |
248 | #endif |
249 | #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32)) |
250 | #define EXT4_CLUSTER_SIZE(s) (EXT4_BLOCK_SIZE(s) << \ |
251 | EXT4_SB(s)->s_cluster_bits) |
252 | #ifdef __KERNEL__ |
253 | # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits) |
254 | # define EXT4_CLUSTER_BITS(s) (EXT4_SB(s)->s_cluster_bits) |
255 | #else |
256 | # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10) |
257 | #endif |
258 | #ifdef __KERNEL__ |
259 | #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits) |
260 | #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size) |
261 | #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino) |
262 | #else |
263 | #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ |
264 | EXT4_GOOD_OLD_INODE_SIZE : \ |
265 | (s)->s_inode_size) |
266 | #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ |
267 | EXT4_GOOD_OLD_FIRST_INO : \ |
268 | (s)->s_first_ino) |
269 | #endif |
270 | #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits))) |
271 | #define EXT4_MAX_BLOCKS(size, offset, blkbits) \ |
272 | ((EXT4_BLOCK_ALIGN(size + offset, blkbits) >> blkbits) - (offset >> \ |
273 | blkbits)) |
274 | |
275 | /* Translate a block number to a cluster number */ |
276 | #define EXT4_B2C(sbi, blk) ((blk) >> (sbi)->s_cluster_bits) |
277 | /* Translate a cluster number to a block number */ |
278 | #define EXT4_C2B(sbi, cluster) ((cluster) << (sbi)->s_cluster_bits) |
279 | /* Translate # of blks to # of clusters */ |
280 | #define EXT4_NUM_B2C(sbi, blks) (((blks) + (sbi)->s_cluster_ratio - 1) >> \ |
281 | (sbi)->s_cluster_bits) |
282 | /* Mask out the low bits to get the starting block of the cluster */ |
283 | #define EXT4_PBLK_CMASK(s, pblk) ((pblk) & \ |
284 | ~((ext4_fsblk_t) (s)->s_cluster_ratio - 1)) |
285 | #define EXT4_LBLK_CMASK(s, lblk) ((lblk) & \ |
286 | ~((ext4_lblk_t) (s)->s_cluster_ratio - 1)) |
287 | /* Get the cluster offset */ |
288 | #define EXT4_PBLK_COFF(s, pblk) ((pblk) & \ |
289 | ((ext4_fsblk_t) (s)->s_cluster_ratio - 1)) |
290 | #define EXT4_LBLK_COFF(s, lblk) ((lblk) & \ |
291 | ((ext4_lblk_t) (s)->s_cluster_ratio - 1)) |
292 | |
293 | /* |
294 | * Structure of a blocks group descriptor |
295 | */ |
296 | struct ext4_group_desc |
297 | { |
298 | __le32 bg_block_bitmap_lo; /* Blocks bitmap block */ |
299 | __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */ |
300 | __le32 bg_inode_table_lo; /* Inodes table block */ |
301 | __le16 bg_free_blocks_count_lo;/* Free blocks count */ |
302 | __le16 bg_free_inodes_count_lo;/* Free inodes count */ |
303 | __le16 bg_used_dirs_count_lo; /* Directories count */ |
304 | __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */ |
305 | __le32 bg_exclude_bitmap_lo; /* Exclude bitmap for snapshots */ |
306 | __le16 bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bbitmap) LE */ |
307 | __le16 bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+ibitmap) LE */ |
308 | __le16 bg_itable_unused_lo; /* Unused inodes count */ |
309 | __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */ |
310 | __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */ |
311 | __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */ |
312 | __le32 bg_inode_table_hi; /* Inodes table block MSB */ |
313 | __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */ |
314 | __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */ |
315 | __le16 bg_used_dirs_count_hi; /* Directories count MSB */ |
316 | __le16 bg_itable_unused_hi; /* Unused inodes count MSB */ |
317 | __le32 bg_exclude_bitmap_hi; /* Exclude bitmap block MSB */ |
318 | __le16 bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bbitmap) BE */ |
319 | __le16 bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+ibitmap) BE */ |
320 | __u32 bg_reserved; |
321 | }; |
322 | |
323 | #define EXT4_BG_INODE_BITMAP_CSUM_HI_END \ |
324 | (offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \ |
325 | sizeof(__le16)) |
326 | #define EXT4_BG_BLOCK_BITMAP_CSUM_HI_END \ |
327 | (offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \ |
328 | sizeof(__le16)) |
329 | |
330 | /* |
331 | * Structure of a flex block group info |
332 | */ |
333 | |
334 | struct flex_groups { |
335 | atomic64_t free_clusters; |
336 | atomic_t free_inodes; |
337 | atomic_t used_dirs; |
338 | }; |
339 | |
340 | #define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */ |
341 | #define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */ |
342 | #define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */ |
343 | |
344 | /* |
345 | * Macro-instructions used to manage group descriptors |
346 | */ |
347 | #define EXT4_MIN_DESC_SIZE 32 |
348 | #define EXT4_MIN_DESC_SIZE_64BIT 64 |
349 | #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE |
350 | #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size) |
351 | #ifdef __KERNEL__ |
352 | # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group) |
353 | # define EXT4_CLUSTERS_PER_GROUP(s) (EXT4_SB(s)->s_clusters_per_group) |
354 | # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block) |
355 | # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group) |
356 | # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits) |
357 | #else |
358 | # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group) |
359 | # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s)) |
360 | # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group) |
361 | #endif |
362 | |
363 | /* |
364 | * Constants relative to the data blocks |
365 | */ |
366 | #define EXT4_NDIR_BLOCKS 12 |
367 | #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS |
368 | #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1) |
369 | #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1) |
370 | #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1) |
371 | |
372 | /* |
373 | * Inode flags |
374 | */ |
375 | #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */ |
376 | #define EXT4_UNRM_FL 0x00000002 /* Undelete */ |
377 | #define EXT4_COMPR_FL 0x00000004 /* Compress file */ |
378 | #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */ |
379 | #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */ |
380 | #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */ |
381 | #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */ |
382 | #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */ |
383 | /* Reserved for compression usage... */ |
384 | #define EXT4_DIRTY_FL 0x00000100 |
385 | #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ |
386 | #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */ |
387 | /* nb: was previously EXT2_ECOMPR_FL */ |
388 | #define EXT4_ENCRYPT_FL 0x00000800 /* encrypted file */ |
389 | /* End compression flags --- maybe not all used */ |
390 | #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */ |
391 | #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */ |
392 | #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */ |
393 | #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */ |
394 | #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */ |
395 | #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/ |
396 | #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */ |
397 | #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */ |
398 | #define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */ |
399 | #define EXT4_EOFBLOCKS_FL 0x00400000 /* Blocks allocated beyond EOF */ |
400 | #define EXT4_INLINE_DATA_FL 0x10000000 /* Inode has inline data. */ |
401 | #define EXT4_PROJINHERIT_FL 0x20000000 /* Create with parents projid */ |
402 | #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */ |
403 | |
404 | #define EXT4_FL_USER_VISIBLE 0x304BDFFF /* User visible flags */ |
405 | #define EXT4_FL_USER_MODIFIABLE 0x204BC0FF /* User modifiable flags */ |
406 | |
407 | /* Flags we can manipulate with through EXT4_IOC_FSSETXATTR */ |
408 | #define EXT4_FL_XFLAG_VISIBLE (EXT4_SYNC_FL | \ |
409 | EXT4_IMMUTABLE_FL | \ |
410 | EXT4_APPEND_FL | \ |
411 | EXT4_NODUMP_FL | \ |
412 | EXT4_NOATIME_FL | \ |
413 | EXT4_PROJINHERIT_FL) |
414 | |
415 | /* Flags that should be inherited by new inodes from their parent. */ |
416 | #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\ |
417 | EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\ |
418 | EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\ |
419 | EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL |\ |
420 | EXT4_PROJINHERIT_FL) |
421 | |
422 | /* Flags that are appropriate for regular files (all but dir-specific ones). */ |
423 | #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL)) |
424 | |
425 | /* Flags that are appropriate for non-directories/regular files. */ |
426 | #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL) |
427 | |
428 | /* The only flags that should be swapped */ |
429 | #define EXT4_FL_SHOULD_SWAP (EXT4_HUGE_FILE_FL | EXT4_EXTENTS_FL) |
430 | |
431 | /* Mask out flags that are inappropriate for the given type of inode. */ |
432 | static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags) |
433 | { |
434 | if (S_ISDIR(mode)) |
435 | return flags; |
436 | else if (S_ISREG(mode)) |
437 | return flags & EXT4_REG_FLMASK; |
438 | else |
439 | return flags & EXT4_OTHER_FLMASK; |
440 | } |
441 | |
442 | /* |
443 | * Inode flags used for atomic set/get |
444 | */ |
445 | enum { |
446 | EXT4_INODE_SECRM = 0, /* Secure deletion */ |
447 | EXT4_INODE_UNRM = 1, /* Undelete */ |
448 | EXT4_INODE_COMPR = 2, /* Compress file */ |
449 | EXT4_INODE_SYNC = 3, /* Synchronous updates */ |
450 | EXT4_INODE_IMMUTABLE = 4, /* Immutable file */ |
451 | EXT4_INODE_APPEND = 5, /* writes to file may only append */ |
452 | EXT4_INODE_NODUMP = 6, /* do not dump file */ |
453 | EXT4_INODE_NOATIME = 7, /* do not update atime */ |
454 | /* Reserved for compression usage... */ |
455 | EXT4_INODE_DIRTY = 8, |
456 | EXT4_INODE_COMPRBLK = 9, /* One or more compressed clusters */ |
457 | EXT4_INODE_NOCOMPR = 10, /* Don't compress */ |
458 | EXT4_INODE_ENCRYPT = 11, /* Encrypted file */ |
459 | /* End compression flags --- maybe not all used */ |
460 | EXT4_INODE_INDEX = 12, /* hash-indexed directory */ |
461 | EXT4_INODE_IMAGIC = 13, /* AFS directory */ |
462 | EXT4_INODE_JOURNAL_DATA = 14, /* file data should be journaled */ |
463 | EXT4_INODE_NOTAIL = 15, /* file tail should not be merged */ |
464 | EXT4_INODE_DIRSYNC = 16, /* dirsync behaviour (directories only) */ |
465 | EXT4_INODE_TOPDIR = 17, /* Top of directory hierarchies*/ |
466 | EXT4_INODE_HUGE_FILE = 18, /* Set to each huge file */ |
467 | EXT4_INODE_EXTENTS = 19, /* Inode uses extents */ |
468 | EXT4_INODE_EA_INODE = 21, /* Inode used for large EA */ |
469 | EXT4_INODE_EOFBLOCKS = 22, /* Blocks allocated beyond EOF */ |
470 | EXT4_INODE_INLINE_DATA = 28, /* Data in inode. */ |
471 | EXT4_INODE_PROJINHERIT = 29, /* Create with parents projid */ |
472 | EXT4_INODE_RESERVED = 31, /* reserved for ext4 lib */ |
473 | }; |
474 | |
475 | /* |
476 | * Since it's pretty easy to mix up bit numbers and hex values, we use a |
477 | * build-time check to make sure that EXT4_XXX_FL is consistent with respect to |
478 | * EXT4_INODE_XXX. If all is well, the macros will be dropped, so, it won't cost |
479 | * any extra space in the compiled kernel image, otherwise, the build will fail. |
480 | * It's important that these values are the same, since we are using |
481 | * EXT4_INODE_XXX to test for flag values, but EXT4_XXX_FL must be consistent |
482 | * with the values of FS_XXX_FL defined in include/linux/fs.h and the on-disk |
483 | * values found in ext2, ext3 and ext4 filesystems, and of course the values |
484 | * defined in e2fsprogs. |
485 | * |
486 | * It's not paranoia if the Murphy's Law really *is* out to get you. :-) |
487 | */ |
488 | #define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG)) |
489 | #define CHECK_FLAG_VALUE(FLAG) BUILD_BUG_ON(!TEST_FLAG_VALUE(FLAG)) |
490 | |
491 | static inline void ext4_check_flag_values(void) |
492 | { |
493 | CHECK_FLAG_VALUE(SECRM); |
494 | CHECK_FLAG_VALUE(UNRM); |
495 | CHECK_FLAG_VALUE(COMPR); |
496 | CHECK_FLAG_VALUE(SYNC); |
497 | CHECK_FLAG_VALUE(IMMUTABLE); |
498 | CHECK_FLAG_VALUE(APPEND); |
499 | CHECK_FLAG_VALUE(NODUMP); |
500 | CHECK_FLAG_VALUE(NOATIME); |
501 | CHECK_FLAG_VALUE(DIRTY); |
502 | CHECK_FLAG_VALUE(COMPRBLK); |
503 | CHECK_FLAG_VALUE(NOCOMPR); |
504 | CHECK_FLAG_VALUE(ENCRYPT); |
505 | CHECK_FLAG_VALUE(INDEX); |
506 | CHECK_FLAG_VALUE(IMAGIC); |
507 | CHECK_FLAG_VALUE(JOURNAL_DATA); |
508 | CHECK_FLAG_VALUE(NOTAIL); |
509 | CHECK_FLAG_VALUE(DIRSYNC); |
510 | CHECK_FLAG_VALUE(TOPDIR); |
511 | CHECK_FLAG_VALUE(HUGE_FILE); |
512 | CHECK_FLAG_VALUE(EXTENTS); |
513 | CHECK_FLAG_VALUE(EA_INODE); |
514 | CHECK_FLAG_VALUE(EOFBLOCKS); |
515 | CHECK_FLAG_VALUE(INLINE_DATA); |
516 | CHECK_FLAG_VALUE(PROJINHERIT); |
517 | CHECK_FLAG_VALUE(RESERVED); |
518 | } |
519 | |
520 | /* Used to pass group descriptor data when online resize is done */ |
521 | struct ext4_new_group_input { |
522 | __u32 group; /* Group number for this data */ |
523 | __u64 block_bitmap; /* Absolute block number of block bitmap */ |
524 | __u64 inode_bitmap; /* Absolute block number of inode bitmap */ |
525 | __u64 inode_table; /* Absolute block number of inode table start */ |
526 | __u32 blocks_count; /* Total number of blocks in this group */ |
527 | __u16 reserved_blocks; /* Number of reserved blocks in this group */ |
528 | __u16 unused; |
529 | }; |
530 | |
531 | #if defined(__KERNEL__) && defined(CONFIG_COMPAT) |
532 | struct compat_ext4_new_group_input { |
533 | u32 group; |
534 | compat_u64 block_bitmap; |
535 | compat_u64 inode_bitmap; |
536 | compat_u64 inode_table; |
537 | u32 blocks_count; |
538 | u16 reserved_blocks; |
539 | u16 unused; |
540 | }; |
541 | #endif |
542 | |
543 | /* The struct ext4_new_group_input in kernel space, with free_blocks_count */ |
544 | struct ext4_new_group_data { |
545 | __u32 group; |
546 | __u64 block_bitmap; |
547 | __u64 inode_bitmap; |
548 | __u64 inode_table; |
549 | __u32 blocks_count; |
550 | __u16 reserved_blocks; |
551 | __u16 mdata_blocks; |
552 | __u32 free_clusters_count; |
553 | }; |
554 | |
555 | /* Indexes used to index group tables in ext4_new_group_data */ |
556 | enum { |
557 | BLOCK_BITMAP = 0, /* block bitmap */ |
558 | INODE_BITMAP, /* inode bitmap */ |
559 | INODE_TABLE, /* inode tables */ |
560 | GROUP_TABLE_COUNT, |
561 | }; |
562 | |
563 | /* |
564 | * Flags used by ext4_map_blocks() |
565 | */ |
566 | /* Allocate any needed blocks and/or convert an unwritten |
567 | extent to be an initialized ext4 */ |
568 | #define EXT4_GET_BLOCKS_CREATE 0x0001 |
569 | /* Request the creation of an unwritten extent */ |
570 | #define EXT4_GET_BLOCKS_UNWRIT_EXT 0x0002 |
571 | #define EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT (EXT4_GET_BLOCKS_UNWRIT_EXT|\ |
572 | EXT4_GET_BLOCKS_CREATE) |
573 | /* Caller is from the delayed allocation writeout path |
574 | * finally doing the actual allocation of delayed blocks */ |
575 | #define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004 |
576 | /* caller is from the direct IO path, request to creation of an |
577 | unwritten extents if not allocated, split the unwritten |
578 | extent if blocks has been preallocated already*/ |
579 | #define EXT4_GET_BLOCKS_PRE_IO 0x0008 |
580 | #define EXT4_GET_BLOCKS_CONVERT 0x0010 |
581 | #define EXT4_GET_BLOCKS_IO_CREATE_EXT (EXT4_GET_BLOCKS_PRE_IO|\ |
582 | EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT) |
583 | /* Convert extent to initialized after IO complete */ |
584 | #define EXT4_GET_BLOCKS_IO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT|\ |
585 | EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT) |
586 | /* Eventual metadata allocation (due to growing extent tree) |
587 | * should not fail, so try to use reserved blocks for that.*/ |
588 | #define EXT4_GET_BLOCKS_METADATA_NOFAIL 0x0020 |
589 | /* Don't normalize allocation size (used for fallocate) */ |
590 | #define EXT4_GET_BLOCKS_NO_NORMALIZE 0x0040 |
591 | /* Request will not result in inode size update (user for fallocate) */ |
592 | #define EXT4_GET_BLOCKS_KEEP_SIZE 0x0080 |
593 | /* Convert written extents to unwritten */ |
594 | #define EXT4_GET_BLOCKS_CONVERT_UNWRITTEN 0x0100 |
595 | /* Write zeros to newly created written extents */ |
596 | #define EXT4_GET_BLOCKS_ZERO 0x0200 |
597 | #define EXT4_GET_BLOCKS_CREATE_ZERO (EXT4_GET_BLOCKS_CREATE |\ |
598 | EXT4_GET_BLOCKS_ZERO) |
599 | /* Caller will submit data before dropping transaction handle. This |
600 | * allows jbd2 to avoid submitting data before commit. */ |
601 | #define EXT4_GET_BLOCKS_IO_SUBMIT 0x0400 |
602 | |
603 | /* |
604 | * The bit position of these flags must not overlap with any of the |
605 | * EXT4_GET_BLOCKS_*. They are used by ext4_find_extent(), |
606 | * read_extent_tree_block(), ext4_split_extent_at(), |
607 | * ext4_ext_insert_extent(), and ext4_ext_create_new_leaf(). |
608 | * EXT4_EX_NOCACHE is used to indicate that the we shouldn't be |
609 | * caching the extents when reading from the extent tree while a |
610 | * truncate or punch hole operation is in progress. |
611 | */ |
612 | #define EXT4_EX_NOCACHE 0x40000000 |
613 | #define EXT4_EX_FORCE_CACHE 0x20000000 |
614 | |
615 | /* |
616 | * Flags used by ext4_free_blocks |
617 | */ |
618 | #define EXT4_FREE_BLOCKS_METADATA 0x0001 |
619 | #define EXT4_FREE_BLOCKS_FORGET 0x0002 |
620 | #define EXT4_FREE_BLOCKS_VALIDATED 0x0004 |
621 | #define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE 0x0008 |
622 | #define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER 0x0010 |
623 | #define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER 0x0020 |
624 | #define EXT4_FREE_BLOCKS_RERESERVE_CLUSTER 0x0040 |
625 | |
626 | /* |
627 | * ioctl commands |
628 | */ |
629 | #define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS |
630 | #define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS |
631 | #define EXT4_IOC_GETVERSION _IOR('f', 3, long) |
632 | #define EXT4_IOC_SETVERSION _IOW('f', 4, long) |
633 | #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION |
634 | #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION |
635 | #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long) |
636 | #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long) |
637 | #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long) |
638 | #define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input) |
639 | #define EXT4_IOC_MIGRATE _IO('f', 9) |
640 | /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */ |
641 | /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */ |
642 | #define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12) |
643 | #define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent) |
644 | #define EXT4_IOC_RESIZE_FS _IOW('f', 16, __u64) |
645 | #define EXT4_IOC_SWAP_BOOT _IO('f', 17) |
646 | #define EXT4_IOC_PRECACHE_EXTENTS _IO('f', 18) |
647 | #define EXT4_IOC_SET_ENCRYPTION_POLICY FS_IOC_SET_ENCRYPTION_POLICY |
648 | #define EXT4_IOC_GET_ENCRYPTION_PWSALT FS_IOC_GET_ENCRYPTION_PWSALT |
649 | #define EXT4_IOC_GET_ENCRYPTION_POLICY FS_IOC_GET_ENCRYPTION_POLICY |
650 | |
651 | #define EXT4_IOC_FSGETXATTR FS_IOC_FSGETXATTR |
652 | #define EXT4_IOC_FSSETXATTR FS_IOC_FSSETXATTR |
653 | |
654 | #define EXT4_IOC_SHUTDOWN _IOR ('X', 125, __u32) |
655 | |
656 | /* |
657 | * Flags for going down operation |
658 | */ |
659 | #define EXT4_GOING_FLAGS_DEFAULT 0x0 /* going down */ |
660 | #define EXT4_GOING_FLAGS_LOGFLUSH 0x1 /* flush log but not data */ |
661 | #define EXT4_GOING_FLAGS_NOLOGFLUSH 0x2 /* don't flush log nor data */ |
662 | |
663 | |
664 | #if defined(__KERNEL__) && defined(CONFIG_COMPAT) |
665 | /* |
666 | * ioctl commands in 32 bit emulation |
667 | */ |
668 | #define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS |
669 | #define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS |
670 | #define EXT4_IOC32_GETVERSION _IOR('f', 3, int) |
671 | #define EXT4_IOC32_SETVERSION _IOW('f', 4, int) |
672 | #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int) |
673 | #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int) |
674 | #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int) |
675 | #define EXT4_IOC32_GROUP_ADD _IOW('f', 8, struct compat_ext4_new_group_input) |
676 | #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION |
677 | #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION |
678 | #endif |
679 | |
680 | /* Max physical block we can address w/o extents */ |
681 | #define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF |
682 | |
683 | /* Max logical block we can support */ |
684 | #define EXT4_MAX_LOGICAL_BLOCK 0xFFFFFFFF |
685 | |
686 | /* |
687 | * Structure of an inode on the disk |
688 | */ |
689 | struct ext4_inode { |
690 | __le16 i_mode; /* File mode */ |
691 | __le16 i_uid; /* Low 16 bits of Owner Uid */ |
692 | __le32 i_size_lo; /* Size in bytes */ |
693 | __le32 i_atime; /* Access time */ |
694 | __le32 i_ctime; /* Inode Change time */ |
695 | __le32 i_mtime; /* Modification time */ |
696 | __le32 i_dtime; /* Deletion Time */ |
697 | __le16 i_gid; /* Low 16 bits of Group Id */ |
698 | __le16 i_links_count; /* Links count */ |
699 | __le32 i_blocks_lo; /* Blocks count */ |
700 | __le32 i_flags; /* File flags */ |
701 | union { |
702 | struct { |
703 | __le32 l_i_version; |
704 | } linux1; |
705 | struct { |
706 | __u32 h_i_translator; |
707 | } hurd1; |
708 | struct { |
709 | __u32 m_i_reserved1; |
710 | } masix1; |
711 | } osd1; /* OS dependent 1 */ |
712 | __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */ |
713 | __le32 i_generation; /* File version (for NFS) */ |
714 | __le32 i_file_acl_lo; /* File ACL */ |
715 | __le32 i_size_high; |
716 | __le32 i_obso_faddr; /* Obsoleted fragment address */ |
717 | union { |
718 | struct { |
719 | __le16 l_i_blocks_high; /* were l_i_reserved1 */ |
720 | __le16 l_i_file_acl_high; |
721 | __le16 l_i_uid_high; /* these 2 fields */ |
722 | __le16 l_i_gid_high; /* were reserved2[0] */ |
723 | __le16 l_i_checksum_lo;/* crc32c(uuid+inum+inode) LE */ |
724 | __le16 l_i_reserved; |
725 | } linux2; |
726 | struct { |
727 | __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ |
728 | __u16 h_i_mode_high; |
729 | __u16 h_i_uid_high; |
730 | __u16 h_i_gid_high; |
731 | __u32 h_i_author; |
732 | } hurd2; |
733 | struct { |
734 | __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ |
735 | __le16 m_i_file_acl_high; |
736 | __u32 m_i_reserved2[2]; |
737 | } masix2; |
738 | } osd2; /* OS dependent 2 */ |
739 | __le16 ; |
740 | __le16 i_checksum_hi; /* crc32c(uuid+inum+inode) BE */ |
741 | __le32 ; /* extra Change time (nsec << 2 | epoch) */ |
742 | __le32 ; /* extra Modification time(nsec << 2 | epoch) */ |
743 | __le32 ; /* extra Access time (nsec << 2 | epoch) */ |
744 | __le32 i_crtime; /* File Creation time */ |
745 | __le32 ; /* extra FileCreationtime (nsec << 2 | epoch) */ |
746 | __le32 i_version_hi; /* high 32 bits for 64-bit version */ |
747 | __le32 i_projid; /* Project ID */ |
748 | }; |
749 | |
750 | struct move_extent { |
751 | __u32 reserved; /* should be zero */ |
752 | __u32 donor_fd; /* donor file descriptor */ |
753 | __u64 orig_start; /* logical start offset in block for orig */ |
754 | __u64 donor_start; /* logical start offset in block for donor */ |
755 | __u64 len; /* block length to be moved */ |
756 | __u64 moved_len; /* moved block length */ |
757 | }; |
758 | |
759 | #define EXT4_EPOCH_BITS 2 |
760 | #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1) |
761 | #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS) |
762 | |
763 | /* |
764 | * Extended fields will fit into an inode if the filesystem was formatted |
765 | * with large inodes (-I 256 or larger) and there are not currently any EAs |
766 | * consuming all of the available space. For new inodes we always reserve |
767 | * enough space for the kernel's known extended fields, but for inodes |
768 | * created with an old kernel this might not have been the case. None of |
769 | * the extended inode fields is critical for correct filesystem operation. |
770 | * This macro checks if a certain field fits in the inode. Note that |
771 | * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize |
772 | */ |
773 | #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \ |
774 | ((offsetof(typeof(*ext4_inode), field) + \ |
775 | sizeof((ext4_inode)->field)) \ |
776 | <= (EXT4_GOOD_OLD_INODE_SIZE + \ |
777 | (einode)->i_extra_isize)) \ |
778 | |
779 | /* |
780 | * We use an encoding that preserves the times for extra epoch "00": |
781 | * |
782 | * extra msb of adjust for signed |
783 | * epoch 32-bit 32-bit tv_sec to |
784 | * bits time decoded 64-bit tv_sec 64-bit tv_sec valid time range |
785 | * 0 0 1 -0x80000000..-0x00000001 0x000000000 1901-12-13..1969-12-31 |
786 | * 0 0 0 0x000000000..0x07fffffff 0x000000000 1970-01-01..2038-01-19 |
787 | * 0 1 1 0x080000000..0x0ffffffff 0x100000000 2038-01-19..2106-02-07 |
788 | * 0 1 0 0x100000000..0x17fffffff 0x100000000 2106-02-07..2174-02-25 |
789 | * 1 0 1 0x180000000..0x1ffffffff 0x200000000 2174-02-25..2242-03-16 |
790 | * 1 0 0 0x200000000..0x27fffffff 0x200000000 2242-03-16..2310-04-04 |
791 | * 1 1 1 0x280000000..0x2ffffffff 0x300000000 2310-04-04..2378-04-22 |
792 | * 1 1 0 0x300000000..0x37fffffff 0x300000000 2378-04-22..2446-05-10 |
793 | * |
794 | * Note that previous versions of the kernel on 64-bit systems would |
795 | * incorrectly use extra epoch bits 1,1 for dates between 1901 and |
796 | * 1970. e2fsck will correct this, assuming that it is run on the |
797 | * affected filesystem before 2242. |
798 | */ |
799 | |
800 | static inline __le32 (struct timespec64 *time) |
801 | { |
802 | u32 =((time->tv_sec - (s32)time->tv_sec) >> 32) & EXT4_EPOCH_MASK; |
803 | return cpu_to_le32(extra | (time->tv_nsec << EXT4_EPOCH_BITS)); |
804 | } |
805 | |
806 | static inline void (struct timespec64 *time, |
807 | __le32 ) |
808 | { |
809 | if (unlikely(extra & cpu_to_le32(EXT4_EPOCH_MASK))) { |
810 | |
811 | #if 1 |
812 | /* Handle legacy encoding of pre-1970 dates with epoch |
813 | * bits 1,1. (This backwards compatibility may be removed |
814 | * at the discretion of the ext4 developers.) |
815 | */ |
816 | u64 = le32_to_cpu(extra) & EXT4_EPOCH_MASK; |
817 | if (extra_bits == 3 && ((time->tv_sec) & 0x80000000) != 0) |
818 | extra_bits = 0; |
819 | time->tv_sec += extra_bits << 32; |
820 | #else |
821 | time->tv_sec += (u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) << 32; |
822 | #endif |
823 | } |
824 | time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS; |
825 | } |
826 | |
827 | #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \ |
828 | do { \ |
829 | (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \ |
830 | if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) {\ |
831 | (raw_inode)->xtime ## _extra = \ |
832 | ext4_encode_extra_time(&(inode)->xtime); \ |
833 | } \ |
834 | } while (0) |
835 | |
836 | #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \ |
837 | do { \ |
838 | if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ |
839 | (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \ |
840 | if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ |
841 | (raw_inode)->xtime ## _extra = \ |
842 | ext4_encode_extra_time(&(einode)->xtime); \ |
843 | } while (0) |
844 | |
845 | #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \ |
846 | do { \ |
847 | (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \ |
848 | if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) { \ |
849 | ext4_decode_extra_time(&(inode)->xtime, \ |
850 | raw_inode->xtime ## _extra); \ |
851 | } \ |
852 | else \ |
853 | (inode)->xtime.tv_nsec = 0; \ |
854 | } while (0) |
855 | |
856 | |
857 | #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \ |
858 | do { \ |
859 | if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ |
860 | (einode)->xtime.tv_sec = \ |
861 | (signed)le32_to_cpu((raw_inode)->xtime); \ |
862 | else \ |
863 | (einode)->xtime.tv_sec = 0; \ |
864 | if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ |
865 | ext4_decode_extra_time(&(einode)->xtime, \ |
866 | raw_inode->xtime ## _extra); \ |
867 | else \ |
868 | (einode)->xtime.tv_nsec = 0; \ |
869 | } while (0) |
870 | |
871 | #define i_disk_version osd1.linux1.l_i_version |
872 | |
873 | #if defined(__KERNEL__) || defined(__linux__) |
874 | #define i_reserved1 osd1.linux1.l_i_reserved1 |
875 | #define i_file_acl_high osd2.linux2.l_i_file_acl_high |
876 | #define i_blocks_high osd2.linux2.l_i_blocks_high |
877 | #define i_uid_low i_uid |
878 | #define i_gid_low i_gid |
879 | #define i_uid_high osd2.linux2.l_i_uid_high |
880 | #define i_gid_high osd2.linux2.l_i_gid_high |
881 | #define i_checksum_lo osd2.linux2.l_i_checksum_lo |
882 | |
883 | #elif defined(__GNU__) |
884 | |
885 | #define i_translator osd1.hurd1.h_i_translator |
886 | #define i_uid_high osd2.hurd2.h_i_uid_high |
887 | #define i_gid_high osd2.hurd2.h_i_gid_high |
888 | #define i_author osd2.hurd2.h_i_author |
889 | |
890 | #elif defined(__masix__) |
891 | |
892 | #define i_reserved1 osd1.masix1.m_i_reserved1 |
893 | #define i_file_acl_high osd2.masix2.m_i_file_acl_high |
894 | #define i_reserved2 osd2.masix2.m_i_reserved2 |
895 | |
896 | #endif /* defined(__KERNEL__) || defined(__linux__) */ |
897 | |
898 | #include "extents_status.h" |
899 | |
900 | /* |
901 | * Lock subclasses for i_data_sem in the ext4_inode_info structure. |
902 | * |
903 | * These are needed to avoid lockdep false positives when we need to |
904 | * allocate blocks to the quota inode during ext4_map_blocks(), while |
905 | * holding i_data_sem for a normal (non-quota) inode. Since we don't |
906 | * do quota tracking for the quota inode, this avoids deadlock (as |
907 | * well as infinite recursion, since it isn't turtles all the way |
908 | * down...) |
909 | * |
910 | * I_DATA_SEM_NORMAL - Used for most inodes |
911 | * I_DATA_SEM_OTHER - Used by move_inode.c for the second normal inode |
912 | * where the second inode has larger inode number |
913 | * than the first |
914 | * I_DATA_SEM_QUOTA - Used for quota inodes only |
915 | */ |
916 | enum { |
917 | I_DATA_SEM_NORMAL = 0, |
918 | I_DATA_SEM_OTHER, |
919 | I_DATA_SEM_QUOTA, |
920 | }; |
921 | |
922 | |
923 | /* |
924 | * fourth extended file system inode data in memory |
925 | */ |
926 | struct ext4_inode_info { |
927 | __le32 i_data[15]; /* unconverted */ |
928 | __u32 i_dtime; |
929 | ext4_fsblk_t i_file_acl; |
930 | |
931 | /* |
932 | * i_block_group is the number of the block group which contains |
933 | * this file's inode. Constant across the lifetime of the inode, |
934 | * it is used for making block allocation decisions - we try to |
935 | * place a file's data blocks near its inode block, and new inodes |
936 | * near to their parent directory's inode. |
937 | */ |
938 | ext4_group_t i_block_group; |
939 | ext4_lblk_t i_dir_start_lookup; |
940 | #if (BITS_PER_LONG < 64) |
941 | unsigned long i_state_flags; /* Dynamic state flags */ |
942 | #endif |
943 | unsigned long i_flags; |
944 | |
945 | /* |
946 | * Extended attributes can be read independently of the main file |
947 | * data. Taking i_mutex even when reading would cause contention |
948 | * between readers of EAs and writers of regular file data, so |
949 | * instead we synchronize on xattr_sem when reading or changing |
950 | * EAs. |
951 | */ |
952 | struct rw_semaphore xattr_sem; |
953 | |
954 | struct list_head i_orphan; /* unlinked but open inodes */ |
955 | |
956 | /* |
957 | * i_disksize keeps track of what the inode size is ON DISK, not |
958 | * in memory. During truncate, i_size is set to the new size by |
959 | * the VFS prior to calling ext4_truncate(), but the filesystem won't |
960 | * set i_disksize to 0 until the truncate is actually under way. |
961 | * |
962 | * The intent is that i_disksize always represents the blocks which |
963 | * are used by this file. This allows recovery to restart truncate |
964 | * on orphans if we crash during truncate. We actually write i_disksize |
965 | * into the on-disk inode when writing inodes out, instead of i_size. |
966 | * |
967 | * The only time when i_disksize and i_size may be different is when |
968 | * a truncate is in progress. The only things which change i_disksize |
969 | * are ext4_get_block (growth) and ext4_truncate (shrinkth). |
970 | */ |
971 | loff_t i_disksize; |
972 | |
973 | /* |
974 | * i_data_sem is for serialising ext4_truncate() against |
975 | * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's |
976 | * data tree are chopped off during truncate. We can't do that in |
977 | * ext4 because whenever we perform intermediate commits during |
978 | * truncate, the inode and all the metadata blocks *must* be in a |
979 | * consistent state which allows truncation of the orphans to restart |
980 | * during recovery. Hence we must fix the get_block-vs-truncate race |
981 | * by other means, so we have i_data_sem. |
982 | */ |
983 | struct rw_semaphore i_data_sem; |
984 | /* |
985 | * i_mmap_sem is for serializing page faults with truncate / punch hole |
986 | * operations. We have to make sure that new page cannot be faulted in |
987 | * a section of the inode that is being punched. We cannot easily use |
988 | * i_data_sem for this since we need protection for the whole punch |
989 | * operation and i_data_sem ranks below transaction start so we have |
990 | * to occasionally drop it. |
991 | */ |
992 | struct rw_semaphore i_mmap_sem; |
993 | struct inode vfs_inode; |
994 | struct jbd2_inode *jinode; |
995 | |
996 | spinlock_t i_raw_lock; /* protects updates to the raw inode */ |
997 | |
998 | /* |
999 | * File creation time. Its function is same as that of |
1000 | * struct timespec64 i_{a,c,m}time in the generic inode. |
1001 | */ |
1002 | struct timespec64 i_crtime; |
1003 | |
1004 | /* mballoc */ |
1005 | struct list_head i_prealloc_list; |
1006 | spinlock_t i_prealloc_lock; |
1007 | |
1008 | /* extents status tree */ |
1009 | struct ext4_es_tree i_es_tree; |
1010 | rwlock_t i_es_lock; |
1011 | struct list_head i_es_list; |
1012 | unsigned int i_es_all_nr; /* protected by i_es_lock */ |
1013 | unsigned int i_es_shk_nr; /* protected by i_es_lock */ |
1014 | ext4_lblk_t i_es_shrink_lblk; /* Offset where we start searching for |
1015 | extents to shrink. Protected by |
1016 | i_es_lock */ |
1017 | |
1018 | /* ialloc */ |
1019 | ext4_group_t i_last_alloc_group; |
1020 | |
1021 | /* allocation reservation info for delalloc */ |
1022 | /* In case of bigalloc, this refer to clusters rather than blocks */ |
1023 | unsigned int i_reserved_data_blocks; |
1024 | ext4_lblk_t i_da_metadata_calc_last_lblock; |
1025 | int i_da_metadata_calc_len; |
1026 | |
1027 | /* pending cluster reservations for bigalloc file systems */ |
1028 | struct ext4_pending_tree i_pending_tree; |
1029 | |
1030 | /* on-disk additional length */ |
1031 | __u16 ; |
1032 | |
1033 | /* Indicate the inline data space. */ |
1034 | u16 i_inline_off; |
1035 | u16 i_inline_size; |
1036 | |
1037 | #ifdef CONFIG_QUOTA |
1038 | /* quota space reservation, managed internally by quota code */ |
1039 | qsize_t i_reserved_quota; |
1040 | #endif |
1041 | |
1042 | /* Lock protecting lists below */ |
1043 | spinlock_t i_completed_io_lock; |
1044 | /* |
1045 | * Completed IOs that need unwritten extents handling and have |
1046 | * transaction reserved |
1047 | */ |
1048 | struct list_head i_rsv_conversion_list; |
1049 | struct work_struct i_rsv_conversion_work; |
1050 | atomic_t i_unwritten; /* Nr. of inflight conversions pending */ |
1051 | |
1052 | spinlock_t i_block_reservation_lock; |
1053 | |
1054 | /* |
1055 | * Transactions that contain inode's metadata needed to complete |
1056 | * fsync and fdatasync, respectively. |
1057 | */ |
1058 | tid_t i_sync_tid; |
1059 | tid_t i_datasync_tid; |
1060 | |
1061 | #ifdef CONFIG_QUOTA |
1062 | struct dquot *i_dquot[MAXQUOTAS]; |
1063 | #endif |
1064 | |
1065 | /* Precomputed uuid+inum+igen checksum for seeding inode checksums */ |
1066 | __u32 i_csum_seed; |
1067 | |
1068 | kprojid_t i_projid; |
1069 | }; |
1070 | |
1071 | /* |
1072 | * File system states |
1073 | */ |
1074 | #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */ |
1075 | #define EXT4_ERROR_FS 0x0002 /* Errors detected */ |
1076 | #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */ |
1077 | |
1078 | /* |
1079 | * Misc. filesystem flags |
1080 | */ |
1081 | #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */ |
1082 | #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */ |
1083 | #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */ |
1084 | |
1085 | /* |
1086 | * Mount flags set via mount options or defaults |
1087 | */ |
1088 | #define EXT4_MOUNT_NO_MBCACHE 0x00001 /* Do not use mbcache */ |
1089 | #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */ |
1090 | #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */ |
1091 | #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */ |
1092 | #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */ |
1093 | #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */ |
1094 | #define EXT4_MOUNT_ERRORS_MASK 0x00070 |
1095 | #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */ |
1096 | #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/ |
1097 | #ifdef CONFIG_FS_DAX |
1098 | #define EXT4_MOUNT_DAX 0x00200 /* Direct Access */ |
1099 | #else |
1100 | #define EXT4_MOUNT_DAX 0 |
1101 | #endif |
1102 | #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */ |
1103 | #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */ |
1104 | #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */ |
1105 | #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */ |
1106 | #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */ |
1107 | #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */ |
1108 | #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */ |
1109 | #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */ |
1110 | #define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */ |
1111 | #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */ |
1112 | #define EXT4_MOUNT_QUOTA 0x40000 /* Some quota option set */ |
1113 | #define EXT4_MOUNT_USRQUOTA 0x80000 /* "old" user quota, |
1114 | * enable enforcement for hidden |
1115 | * quota files */ |
1116 | #define EXT4_MOUNT_GRPQUOTA 0x100000 /* "old" group quota, enable |
1117 | * enforcement for hidden quota |
1118 | * files */ |
1119 | #define EXT4_MOUNT_PRJQUOTA 0x200000 /* Enable project quota |
1120 | * enforcement */ |
1121 | #define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000 /* Enable support for dio read nolocking */ |
1122 | #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */ |
1123 | #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */ |
1124 | #define EXT4_MOUNT_WARN_ON_ERROR 0x2000000 /* Trigger WARN_ON on error */ |
1125 | #define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */ |
1126 | #define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */ |
1127 | #define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */ |
1128 | #define EXT4_MOUNT_DISCARD 0x40000000 /* Issue DISCARD requests */ |
1129 | #define EXT4_MOUNT_INIT_INODE_TABLE 0x80000000 /* Initialize uninitialized itables */ |
1130 | |
1131 | /* |
1132 | * Mount flags set either automatically (could not be set by mount option) |
1133 | * based on per file system feature or property or in special cases such as |
1134 | * distinguishing between explicit mount option definition and default. |
1135 | */ |
1136 | #define EXT4_MOUNT2_EXPLICIT_DELALLOC 0x00000001 /* User explicitly |
1137 | specified delalloc */ |
1138 | #define EXT4_MOUNT2_STD_GROUP_SIZE 0x00000002 /* We have standard group |
1139 | size of blocksize * 8 |
1140 | blocks */ |
1141 | #define EXT4_MOUNT2_HURD_COMPAT 0x00000004 /* Support HURD-castrated |
1142 | file systems */ |
1143 | |
1144 | #define EXT4_MOUNT2_EXPLICIT_JOURNAL_CHECKSUM 0x00000008 /* User explicitly |
1145 | specified journal checksum */ |
1146 | |
1147 | #define clear_opt(sb, opt) EXT4_SB(sb)->s_mount_opt &= \ |
1148 | ~EXT4_MOUNT_##opt |
1149 | #define set_opt(sb, opt) EXT4_SB(sb)->s_mount_opt |= \ |
1150 | EXT4_MOUNT_##opt |
1151 | #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \ |
1152 | EXT4_MOUNT_##opt) |
1153 | |
1154 | #define clear_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 &= \ |
1155 | ~EXT4_MOUNT2_##opt |
1156 | #define set_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 |= \ |
1157 | EXT4_MOUNT2_##opt |
1158 | #define test_opt2(sb, opt) (EXT4_SB(sb)->s_mount_opt2 & \ |
1159 | EXT4_MOUNT2_##opt) |
1160 | |
1161 | #define ext4_test_and_set_bit __test_and_set_bit_le |
1162 | #define ext4_set_bit __set_bit_le |
1163 | #define ext4_set_bit_atomic ext2_set_bit_atomic |
1164 | #define ext4_test_and_clear_bit __test_and_clear_bit_le |
1165 | #define ext4_clear_bit __clear_bit_le |
1166 | #define ext4_clear_bit_atomic ext2_clear_bit_atomic |
1167 | #define ext4_test_bit test_bit_le |
1168 | #define ext4_find_next_zero_bit find_next_zero_bit_le |
1169 | #define ext4_find_next_bit find_next_bit_le |
1170 | |
1171 | extern void ext4_set_bits(void *bm, int cur, int len); |
1172 | |
1173 | /* |
1174 | * Maximal mount counts between two filesystem checks |
1175 | */ |
1176 | #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ |
1177 | #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */ |
1178 | |
1179 | /* |
1180 | * Behaviour when detecting errors |
1181 | */ |
1182 | #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */ |
1183 | #define EXT4_ERRORS_RO 2 /* Remount fs read-only */ |
1184 | #define EXT4_ERRORS_PANIC 3 /* Panic */ |
1185 | #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE |
1186 | |
1187 | /* Metadata checksum algorithm codes */ |
1188 | #define EXT4_CRC32C_CHKSUM 1 |
1189 | |
1190 | /* |
1191 | * Structure of the super block |
1192 | */ |
1193 | struct ext4_super_block { |
1194 | /*00*/ __le32 s_inodes_count; /* Inodes count */ |
1195 | __le32 s_blocks_count_lo; /* Blocks count */ |
1196 | __le32 s_r_blocks_count_lo; /* Reserved blocks count */ |
1197 | __le32 s_free_blocks_count_lo; /* Free blocks count */ |
1198 | /*10*/ __le32 s_free_inodes_count; /* Free inodes count */ |
1199 | __le32 s_first_data_block; /* First Data Block */ |
1200 | __le32 s_log_block_size; /* Block size */ |
1201 | __le32 s_log_cluster_size; /* Allocation cluster size */ |
1202 | /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */ |
1203 | __le32 s_clusters_per_group; /* # Clusters per group */ |
1204 | __le32 s_inodes_per_group; /* # Inodes per group */ |
1205 | __le32 s_mtime; /* Mount time */ |
1206 | /*30*/ __le32 s_wtime; /* Write time */ |
1207 | __le16 s_mnt_count; /* Mount count */ |
1208 | __le16 s_max_mnt_count; /* Maximal mount count */ |
1209 | __le16 s_magic; /* Magic signature */ |
1210 | __le16 s_state; /* File system state */ |
1211 | __le16 s_errors; /* Behaviour when detecting errors */ |
1212 | __le16 s_minor_rev_level; /* minor revision level */ |
1213 | /*40*/ __le32 s_lastcheck; /* time of last check */ |
1214 | __le32 s_checkinterval; /* max. time between checks */ |
1215 | __le32 s_creator_os; /* OS */ |
1216 | __le32 s_rev_level; /* Revision level */ |
1217 | /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */ |
1218 | __le16 s_def_resgid; /* Default gid for reserved blocks */ |
1219 | /* |
1220 | * These fields are for EXT4_DYNAMIC_REV superblocks only. |
1221 | * |
1222 | * Note: the difference between the compatible feature set and |
1223 | * the incompatible feature set is that if there is a bit set |
1224 | * in the incompatible feature set that the kernel doesn't |
1225 | * know about, it should refuse to mount the filesystem. |
1226 | * |
1227 | * e2fsck's requirements are more strict; if it doesn't know |
1228 | * about a feature in either the compatible or incompatible |
1229 | * feature set, it must abort and not try to meddle with |
1230 | * things it doesn't understand... |
1231 | */ |
1232 | __le32 s_first_ino; /* First non-reserved inode */ |
1233 | __le16 s_inode_size; /* size of inode structure */ |
1234 | __le16 s_block_group_nr; /* block group # of this superblock */ |
1235 | __le32 s_feature_compat; /* compatible feature set */ |
1236 | /*60*/ __le32 s_feature_incompat; /* incompatible feature set */ |
1237 | __le32 s_feature_ro_compat; /* readonly-compatible feature set */ |
1238 | /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */ |
1239 | /*78*/ char s_volume_name[16]; /* volume name */ |
1240 | /*88*/ char s_last_mounted[64] __nonstring; /* directory where last mounted */ |
1241 | /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */ |
1242 | /* |
1243 | * Performance hints. Directory preallocation should only |
1244 | * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on. |
1245 | */ |
1246 | __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ |
1247 | __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ |
1248 | __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */ |
1249 | /* |
1250 | * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set. |
1251 | */ |
1252 | /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */ |
1253 | /*E0*/ __le32 s_journal_inum; /* inode number of journal file */ |
1254 | __le32 s_journal_dev; /* device number of journal file */ |
1255 | __le32 s_last_orphan; /* start of list of inodes to delete */ |
1256 | __le32 s_hash_seed[4]; /* HTREE hash seed */ |
1257 | __u8 s_def_hash_version; /* Default hash version to use */ |
1258 | __u8 s_jnl_backup_type; |
1259 | __le16 s_desc_size; /* size of group descriptor */ |
1260 | /*100*/ __le32 s_default_mount_opts; |
1261 | __le32 s_first_meta_bg; /* First metablock block group */ |
1262 | __le32 s_mkfs_time; /* When the filesystem was created */ |
1263 | __le32 s_jnl_blocks[17]; /* Backup of the journal inode */ |
1264 | /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */ |
1265 | /*150*/ __le32 s_blocks_count_hi; /* Blocks count */ |
1266 | __le32 s_r_blocks_count_hi; /* Reserved blocks count */ |
1267 | __le32 s_free_blocks_count_hi; /* Free blocks count */ |
1268 | __le16 ; /* All inodes have at least # bytes */ |
1269 | __le16 ; /* New inodes should reserve # bytes */ |
1270 | __le32 s_flags; /* Miscellaneous flags */ |
1271 | __le16 s_raid_stride; /* RAID stride */ |
1272 | __le16 s_mmp_update_interval; /* # seconds to wait in MMP checking */ |
1273 | __le64 s_mmp_block; /* Block for multi-mount protection */ |
1274 | __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/ |
1275 | __u8 s_log_groups_per_flex; /* FLEX_BG group size */ |
1276 | __u8 s_checksum_type; /* metadata checksum algorithm used */ |
1277 | __u8 s_encryption_level; /* versioning level for encryption */ |
1278 | __u8 s_reserved_pad; /* Padding to next 32bits */ |
1279 | __le64 s_kbytes_written; /* nr of lifetime kilobytes written */ |
1280 | __le32 s_snapshot_inum; /* Inode number of active snapshot */ |
1281 | __le32 s_snapshot_id; /* sequential ID of active snapshot */ |
1282 | __le64 s_snapshot_r_blocks_count; /* reserved blocks for active |
1283 | snapshot's future use */ |
1284 | __le32 s_snapshot_list; /* inode number of the head of the |
1285 | on-disk snapshot list */ |
1286 | #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count) |
1287 | __le32 s_error_count; /* number of fs errors */ |
1288 | __le32 s_first_error_time; /* first time an error happened */ |
1289 | __le32 s_first_error_ino; /* inode involved in first error */ |
1290 | __le64 s_first_error_block; /* block involved of first error */ |
1291 | __u8 s_first_error_func[32] __nonstring; /* function where the error happened */ |
1292 | __le32 s_first_error_line; /* line number where error happened */ |
1293 | __le32 s_last_error_time; /* most recent time of an error */ |
1294 | __le32 s_last_error_ino; /* inode involved in last error */ |
1295 | __le32 s_last_error_line; /* line number where error happened */ |
1296 | __le64 s_last_error_block; /* block involved of last error */ |
1297 | __u8 s_last_error_func[32] __nonstring; /* function where the error happened */ |
1298 | #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts) |
1299 | __u8 s_mount_opts[64]; |
1300 | __le32 s_usr_quota_inum; /* inode for tracking user quota */ |
1301 | __le32 s_grp_quota_inum; /* inode for tracking group quota */ |
1302 | __le32 s_overhead_clusters; /* overhead blocks/clusters in fs */ |
1303 | __le32 s_backup_bgs[2]; /* groups with sparse_super2 SBs */ |
1304 | __u8 s_encrypt_algos[4]; /* Encryption algorithms in use */ |
1305 | __u8 s_encrypt_pw_salt[16]; /* Salt used for string2key algorithm */ |
1306 | __le32 s_lpf_ino; /* Location of the lost+found inode */ |
1307 | __le32 s_prj_quota_inum; /* inode for tracking project quota */ |
1308 | __le32 s_checksum_seed; /* crc32c(uuid) if csum_seed set */ |
1309 | __u8 s_wtime_hi; |
1310 | __u8 s_mtime_hi; |
1311 | __u8 s_mkfs_time_hi; |
1312 | __u8 s_lastcheck_hi; |
1313 | __u8 s_first_error_time_hi; |
1314 | __u8 s_last_error_time_hi; |
1315 | __u8 s_pad[2]; |
1316 | __le32 s_reserved[96]; /* Padding to the end of the block */ |
1317 | __le32 s_checksum; /* crc32c(superblock) */ |
1318 | }; |
1319 | |
1320 | #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START) |
1321 | |
1322 | #ifdef __KERNEL__ |
1323 | |
1324 | /* |
1325 | * run-time mount flags |
1326 | */ |
1327 | #define EXT4_MF_MNTDIR_SAMPLED 0x0001 |
1328 | #define EXT4_MF_FS_ABORTED 0x0002 /* Fatal error detected */ |
1329 | #define EXT4_MF_TEST_DUMMY_ENCRYPTION 0x0004 |
1330 | |
1331 | #ifdef CONFIG_FS_ENCRYPTION |
1332 | #define DUMMY_ENCRYPTION_ENABLED(sbi) (unlikely((sbi)->s_mount_flags & \ |
1333 | EXT4_MF_TEST_DUMMY_ENCRYPTION)) |
1334 | #else |
1335 | #define DUMMY_ENCRYPTION_ENABLED(sbi) (0) |
1336 | #endif |
1337 | |
1338 | /* Number of quota types we support */ |
1339 | #define EXT4_MAXQUOTAS 3 |
1340 | |
1341 | /* |
1342 | * fourth extended-fs super-block data in memory |
1343 | */ |
1344 | struct ext4_sb_info { |
1345 | unsigned long s_desc_size; /* Size of a group descriptor in bytes */ |
1346 | unsigned long s_inodes_per_block;/* Number of inodes per block */ |
1347 | unsigned long s_blocks_per_group;/* Number of blocks in a group */ |
1348 | unsigned long s_clusters_per_group; /* Number of clusters in a group */ |
1349 | unsigned long s_inodes_per_group;/* Number of inodes in a group */ |
1350 | unsigned long s_itb_per_group; /* Number of inode table blocks per group */ |
1351 | unsigned long s_gdb_count; /* Number of group descriptor blocks */ |
1352 | unsigned long s_desc_per_block; /* Number of group descriptors per block */ |
1353 | ext4_group_t s_groups_count; /* Number of groups in the fs */ |
1354 | ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */ |
1355 | unsigned long s_overhead; /* # of fs overhead clusters */ |
1356 | unsigned int s_cluster_ratio; /* Number of blocks per cluster */ |
1357 | unsigned int s_cluster_bits; /* log2 of s_cluster_ratio */ |
1358 | loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */ |
1359 | struct buffer_head * s_sbh; /* Buffer containing the super block */ |
1360 | struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */ |
1361 | struct buffer_head **s_group_desc; |
1362 | unsigned int s_mount_opt; |
1363 | unsigned int s_mount_opt2; |
1364 | unsigned int s_mount_flags; |
1365 | unsigned int s_def_mount_opt; |
1366 | ext4_fsblk_t s_sb_block; |
1367 | atomic64_t s_resv_clusters; |
1368 | kuid_t s_resuid; |
1369 | kgid_t s_resgid; |
1370 | unsigned short s_mount_state; |
1371 | unsigned short s_pad; |
1372 | int s_addr_per_block_bits; |
1373 | int s_desc_per_block_bits; |
1374 | int s_inode_size; |
1375 | int s_first_ino; |
1376 | unsigned int s_inode_readahead_blks; |
1377 | unsigned int s_inode_goal; |
1378 | u32 s_hash_seed[4]; |
1379 | int s_def_hash_version; |
1380 | int s_hash_unsigned; /* 3 if hash should be signed, 0 if not */ |
1381 | struct percpu_counter s_freeclusters_counter; |
1382 | struct percpu_counter s_freeinodes_counter; |
1383 | struct percpu_counter s_dirs_counter; |
1384 | struct percpu_counter s_dirtyclusters_counter; |
1385 | struct blockgroup_lock *s_blockgroup_lock; |
1386 | struct proc_dir_entry *s_proc; |
1387 | struct kobject s_kobj; |
1388 | struct completion s_kobj_unregister; |
1389 | struct super_block *s_sb; |
1390 | |
1391 | /* Journaling */ |
1392 | struct journal_s *s_journal; |
1393 | struct list_head s_orphan; |
1394 | struct mutex s_orphan_lock; |
1395 | unsigned long s_ext4_flags; /* Ext4 superblock flags */ |
1396 | unsigned long s_commit_interval; |
1397 | u32 s_max_batch_time; |
1398 | u32 s_min_batch_time; |
1399 | struct block_device *journal_bdev; |
1400 | #ifdef CONFIG_QUOTA |
1401 | /* Names of quota files with journalled quota */ |
1402 | char __rcu *s_qf_names[EXT4_MAXQUOTAS]; |
1403 | int s_jquota_fmt; /* Format of quota to use */ |
1404 | #endif |
1405 | unsigned int ; /* New inodes should reserve # bytes */ |
1406 | struct rb_root system_blks; |
1407 | |
1408 | #ifdef EXTENTS_STATS |
1409 | /* ext4 extents stats */ |
1410 | unsigned long s_ext_min; |
1411 | unsigned long s_ext_max; |
1412 | unsigned long s_depth_max; |
1413 | spinlock_t s_ext_stats_lock; |
1414 | unsigned long s_ext_blocks; |
1415 | unsigned long s_ext_extents; |
1416 | #endif |
1417 | |
1418 | /* for buddy allocator */ |
1419 | struct ext4_group_info ***s_group_info; |
1420 | struct inode *s_buddy_cache; |
1421 | spinlock_t s_md_lock; |
1422 | unsigned short *s_mb_offsets; |
1423 | unsigned int *s_mb_maxs; |
1424 | unsigned int s_group_info_size; |
1425 | unsigned int s_mb_free_pending; |
1426 | struct list_head s_freed_data_list; /* List of blocks to be freed |
1427 | after commit completed */ |
1428 | |
1429 | /* tunables */ |
1430 | unsigned long s_stripe; |
1431 | unsigned int s_mb_stream_request; |
1432 | unsigned int s_mb_max_to_scan; |
1433 | unsigned int s_mb_min_to_scan; |
1434 | unsigned int s_mb_stats; |
1435 | unsigned int s_mb_order2_reqs; |
1436 | unsigned int s_mb_group_prealloc; |
1437 | unsigned int s_max_dir_size_kb; |
1438 | /* where last allocation was done - for stream allocation */ |
1439 | unsigned long s_mb_last_group; |
1440 | unsigned long s_mb_last_start; |
1441 | |
1442 | /* stats for buddy allocator */ |
1443 | atomic_t s_bal_reqs; /* number of reqs with len > 1 */ |
1444 | atomic_t s_bal_success; /* we found long enough chunks */ |
1445 | atomic_t s_bal_allocated; /* in blocks */ |
1446 | atomic_t s_bal_ex_scanned; /* total extents scanned */ |
1447 | atomic_t s_bal_goals; /* goal hits */ |
1448 | atomic_t s_bal_breaks; /* too long searches */ |
1449 | atomic_t s_bal_2orders; /* 2^order hits */ |
1450 | spinlock_t s_bal_lock; |
1451 | unsigned long s_mb_buddies_generated; |
1452 | unsigned long long s_mb_generation_time; |
1453 | atomic_t s_mb_lost_chunks; |
1454 | atomic_t s_mb_preallocated; |
1455 | atomic_t s_mb_discarded; |
1456 | atomic_t s_lock_busy; |
1457 | |
1458 | /* locality groups */ |
1459 | struct ext4_locality_group __percpu *s_locality_groups; |
1460 | |
1461 | /* for write statistics */ |
1462 | unsigned long s_sectors_written_start; |
1463 | u64 s_kbytes_written; |
1464 | |
1465 | /* the size of zero-out chunk */ |
1466 | unsigned int s_extent_max_zeroout_kb; |
1467 | |
1468 | unsigned int s_log_groups_per_flex; |
1469 | struct flex_groups *s_flex_groups; |
1470 | ext4_group_t s_flex_groups_allocated; |
1471 | |
1472 | /* workqueue for reserved extent conversions (buffered io) */ |
1473 | struct workqueue_struct *rsv_conversion_wq; |
1474 | |
1475 | /* timer for periodic error stats printing */ |
1476 | struct timer_list s_err_report; |
1477 | |
1478 | /* Lazy inode table initialization info */ |
1479 | struct ext4_li_request *s_li_request; |
1480 | /* Wait multiplier for lazy initialization thread */ |
1481 | unsigned int s_li_wait_mult; |
1482 | |
1483 | /* Kernel thread for multiple mount protection */ |
1484 | struct task_struct *s_mmp_tsk; |
1485 | |
1486 | /* record the last minlen when FITRIM is called. */ |
1487 | atomic_t s_last_trim_minblks; |
1488 | |
1489 | /* Reference to checksum algorithm driver via cryptoapi */ |
1490 | struct crypto_shash *s_chksum_driver; |
1491 | |
1492 | /* Precomputed FS UUID checksum for seeding other checksums */ |
1493 | __u32 s_csum_seed; |
1494 | |
1495 | /* Reclaim extents from extent status tree */ |
1496 | struct shrinker s_es_shrinker; |
1497 | struct list_head s_es_list; /* List of inodes with reclaimable extents */ |
1498 | long s_es_nr_inode; |
1499 | struct ext4_es_stats s_es_stats; |
1500 | struct mb_cache *s_ea_block_cache; |
1501 | struct mb_cache *s_ea_inode_cache; |
1502 | spinlock_t s_es_lock ____cacheline_aligned_in_smp; |
1503 | |
1504 | /* Ratelimit ext4 messages. */ |
1505 | struct ratelimit_state s_err_ratelimit_state; |
1506 | struct ratelimit_state s_warning_ratelimit_state; |
1507 | struct ratelimit_state s_msg_ratelimit_state; |
1508 | |
1509 | /* Barrier between changing inodes' journal flags and writepages ops. */ |
1510 | struct percpu_rw_semaphore s_journal_flag_rwsem; |
1511 | struct dax_device *s_daxdev; |
1512 | }; |
1513 | |
1514 | static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb) |
1515 | { |
1516 | return sb->s_fs_info; |
1517 | } |
1518 | static inline struct ext4_inode_info *EXT4_I(struct inode *inode) |
1519 | { |
1520 | return container_of(inode, struct ext4_inode_info, vfs_inode); |
1521 | } |
1522 | |
1523 | static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino) |
1524 | { |
1525 | return ino == EXT4_ROOT_INO || |
1526 | (ino >= EXT4_FIRST_INO(sb) && |
1527 | ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count)); |
1528 | } |
1529 | |
1530 | /* |
1531 | * Inode dynamic state flags |
1532 | */ |
1533 | enum { |
1534 | EXT4_STATE_JDATA, /* journaled data exists */ |
1535 | EXT4_STATE_NEW, /* inode is newly created */ |
1536 | EXT4_STATE_XATTR, /* has in-inode xattrs */ |
1537 | EXT4_STATE_NO_EXPAND, /* No space for expansion */ |
1538 | EXT4_STATE_DA_ALLOC_CLOSE, /* Alloc DA blks on close */ |
1539 | EXT4_STATE_EXT_MIGRATE, /* Inode is migrating */ |
1540 | EXT4_STATE_DIO_UNWRITTEN, /* need convert on dio done*/ |
1541 | EXT4_STATE_NEWENTRY, /* File just added to dir */ |
1542 | EXT4_STATE_MAY_INLINE_DATA, /* may have in-inode data */ |
1543 | EXT4_STATE_EXT_PRECACHED, /* extents have been precached */ |
1544 | EXT4_STATE_LUSTRE_EA_INODE, /* Lustre-style ea_inode */ |
1545 | }; |
1546 | |
1547 | #define EXT4_INODE_BIT_FNS(name, field, offset) \ |
1548 | static inline int ext4_test_inode_##name(struct inode *inode, int bit) \ |
1549 | { \ |
1550 | return test_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ |
1551 | } \ |
1552 | static inline void ext4_set_inode_##name(struct inode *inode, int bit) \ |
1553 | { \ |
1554 | set_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ |
1555 | } \ |
1556 | static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \ |
1557 | { \ |
1558 | clear_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ |
1559 | } |
1560 | |
1561 | /* Add these declarations here only so that these functions can be |
1562 | * found by name. Otherwise, they are very hard to locate. */ |
1563 | static inline int ext4_test_inode_flag(struct inode *inode, int bit); |
1564 | static inline void ext4_set_inode_flag(struct inode *inode, int bit); |
1565 | static inline void ext4_clear_inode_flag(struct inode *inode, int bit); |
1566 | EXT4_INODE_BIT_FNS(flag, flags, 0) |
1567 | |
1568 | /* Add these declarations here only so that these functions can be |
1569 | * found by name. Otherwise, they are very hard to locate. */ |
1570 | static inline int ext4_test_inode_state(struct inode *inode, int bit); |
1571 | static inline void ext4_set_inode_state(struct inode *inode, int bit); |
1572 | static inline void ext4_clear_inode_state(struct inode *inode, int bit); |
1573 | #if (BITS_PER_LONG < 64) |
1574 | EXT4_INODE_BIT_FNS(state, state_flags, 0) |
1575 | |
1576 | static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) |
1577 | { |
1578 | (ei)->i_state_flags = 0; |
1579 | } |
1580 | #else |
1581 | EXT4_INODE_BIT_FNS(state, flags, 32) |
1582 | |
1583 | static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) |
1584 | { |
1585 | /* We depend on the fact that callers will set i_flags */ |
1586 | } |
1587 | #endif |
1588 | #else |
1589 | /* Assume that user mode programs are passing in an ext4fs superblock, not |
1590 | * a kernel struct super_block. This will allow us to call the feature-test |
1591 | * macros from user land. */ |
1592 | #define EXT4_SB(sb) (sb) |
1593 | #endif |
1594 | |
1595 | /* |
1596 | * Returns true if the inode is inode is encrypted |
1597 | */ |
1598 | #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime |
1599 | |
1600 | /* |
1601 | * Codes for operating systems |
1602 | */ |
1603 | #define EXT4_OS_LINUX 0 |
1604 | #define EXT4_OS_HURD 1 |
1605 | #define EXT4_OS_MASIX 2 |
1606 | #define EXT4_OS_FREEBSD 3 |
1607 | #define EXT4_OS_LITES 4 |
1608 | |
1609 | /* |
1610 | * Revision levels |
1611 | */ |
1612 | #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */ |
1613 | #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ |
1614 | |
1615 | #define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV |
1616 | #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV |
1617 | |
1618 | #define EXT4_GOOD_OLD_INODE_SIZE 128 |
1619 | |
1620 | /* |
1621 | * Feature set definitions |
1622 | */ |
1623 | |
1624 | #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001 |
1625 | #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002 |
1626 | #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004 |
1627 | #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008 |
1628 | #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010 |
1629 | #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020 |
1630 | #define EXT4_FEATURE_COMPAT_SPARSE_SUPER2 0x0200 |
1631 | |
1632 | #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 |
1633 | #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 |
1634 | #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 |
1635 | #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008 |
1636 | #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010 |
1637 | #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020 |
1638 | #define 0x0040 |
1639 | #define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100 |
1640 | #define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200 |
1641 | /* |
1642 | * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM). When |
1643 | * METADATA_CSUM is set, group descriptor checksums use the same algorithm as |
1644 | * all other data structures' checksums. However, the METADATA_CSUM and |
1645 | * GDT_CSUM bits are mutually exclusive. |
1646 | */ |
1647 | #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400 |
1648 | #define EXT4_FEATURE_RO_COMPAT_READONLY 0x1000 |
1649 | #define EXT4_FEATURE_RO_COMPAT_PROJECT 0x2000 |
1650 | |
1651 | #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001 |
1652 | #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002 |
1653 | #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */ |
1654 | #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */ |
1655 | #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010 |
1656 | #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */ |
1657 | #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080 |
1658 | #define EXT4_FEATURE_INCOMPAT_MMP 0x0100 |
1659 | #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200 |
1660 | #define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 /* EA in inode */ |
1661 | #define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 /* data in dirent */ |
1662 | #define EXT4_FEATURE_INCOMPAT_CSUM_SEED 0x2000 |
1663 | #define EXT4_FEATURE_INCOMPAT_LARGEDIR 0x4000 /* >2GB or 3-lvl htree */ |
1664 | #define EXT4_FEATURE_INCOMPAT_INLINE_DATA 0x8000 /* data in inode */ |
1665 | #define EXT4_FEATURE_INCOMPAT_ENCRYPT 0x10000 |
1666 | |
1667 | extern void ext4_update_dynamic_rev(struct super_block *sb); |
1668 | |
1669 | #define EXT4_FEATURE_COMPAT_FUNCS(name, flagname) \ |
1670 | static inline bool ext4_has_feature_##name(struct super_block *sb) \ |
1671 | { \ |
1672 | return ((EXT4_SB(sb)->s_es->s_feature_compat & \ |
1673 | cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname)) != 0); \ |
1674 | } \ |
1675 | static inline void ext4_set_feature_##name(struct super_block *sb) \ |
1676 | { \ |
1677 | ext4_update_dynamic_rev(sb); \ |
1678 | EXT4_SB(sb)->s_es->s_feature_compat |= \ |
1679 | cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \ |
1680 | } \ |
1681 | static inline void ext4_clear_feature_##name(struct super_block *sb) \ |
1682 | { \ |
1683 | EXT4_SB(sb)->s_es->s_feature_compat &= \ |
1684 | ~cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \ |
1685 | } |
1686 | |
1687 | #define EXT4_FEATURE_RO_COMPAT_FUNCS(name, flagname) \ |
1688 | static inline bool ext4_has_feature_##name(struct super_block *sb) \ |
1689 | { \ |
1690 | return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \ |
1691 | cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname)) != 0); \ |
1692 | } \ |
1693 | static inline void ext4_set_feature_##name(struct super_block *sb) \ |
1694 | { \ |
1695 | ext4_update_dynamic_rev(sb); \ |
1696 | EXT4_SB(sb)->s_es->s_feature_ro_compat |= \ |
1697 | cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \ |
1698 | } \ |
1699 | static inline void ext4_clear_feature_##name(struct super_block *sb) \ |
1700 | { \ |
1701 | EXT4_SB(sb)->s_es->s_feature_ro_compat &= \ |
1702 | ~cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \ |
1703 | } |
1704 | |
1705 | #define EXT4_FEATURE_INCOMPAT_FUNCS(name, flagname) \ |
1706 | static inline bool ext4_has_feature_##name(struct super_block *sb) \ |
1707 | { \ |
1708 | return ((EXT4_SB(sb)->s_es->s_feature_incompat & \ |
1709 | cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname)) != 0); \ |
1710 | } \ |
1711 | static inline void ext4_set_feature_##name(struct super_block *sb) \ |
1712 | { \ |
1713 | ext4_update_dynamic_rev(sb); \ |
1714 | EXT4_SB(sb)->s_es->s_feature_incompat |= \ |
1715 | cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \ |
1716 | } \ |
1717 | static inline void ext4_clear_feature_##name(struct super_block *sb) \ |
1718 | { \ |
1719 | EXT4_SB(sb)->s_es->s_feature_incompat &= \ |
1720 | ~cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \ |
1721 | } |
1722 | |
1723 | EXT4_FEATURE_COMPAT_FUNCS(dir_prealloc, DIR_PREALLOC) |
1724 | EXT4_FEATURE_COMPAT_FUNCS(imagic_inodes, IMAGIC_INODES) |
1725 | EXT4_FEATURE_COMPAT_FUNCS(journal, HAS_JOURNAL) |
1726 | EXT4_FEATURE_COMPAT_FUNCS(xattr, EXT_ATTR) |
1727 | EXT4_FEATURE_COMPAT_FUNCS(resize_inode, RESIZE_INODE) |
1728 | EXT4_FEATURE_COMPAT_FUNCS(dir_index, DIR_INDEX) |
1729 | EXT4_FEATURE_COMPAT_FUNCS(sparse_super2, SPARSE_SUPER2) |
1730 | |
1731 | EXT4_FEATURE_RO_COMPAT_FUNCS(sparse_super, SPARSE_SUPER) |
1732 | EXT4_FEATURE_RO_COMPAT_FUNCS(large_file, LARGE_FILE) |
1733 | EXT4_FEATURE_RO_COMPAT_FUNCS(btree_dir, BTREE_DIR) |
1734 | EXT4_FEATURE_RO_COMPAT_FUNCS(huge_file, HUGE_FILE) |
1735 | EXT4_FEATURE_RO_COMPAT_FUNCS(gdt_csum, GDT_CSUM) |
1736 | EXT4_FEATURE_RO_COMPAT_FUNCS(dir_nlink, DIR_NLINK) |
1737 | EXT4_FEATURE_RO_COMPAT_FUNCS(extra_isize, EXTRA_ISIZE) |
1738 | EXT4_FEATURE_RO_COMPAT_FUNCS(quota, QUOTA) |
1739 | EXT4_FEATURE_RO_COMPAT_FUNCS(bigalloc, BIGALLOC) |
1740 | EXT4_FEATURE_RO_COMPAT_FUNCS(metadata_csum, METADATA_CSUM) |
1741 | EXT4_FEATURE_RO_COMPAT_FUNCS(readonly, READONLY) |
1742 | EXT4_FEATURE_RO_COMPAT_FUNCS(project, PROJECT) |
1743 | |
1744 | EXT4_FEATURE_INCOMPAT_FUNCS(compression, COMPRESSION) |
1745 | EXT4_FEATURE_INCOMPAT_FUNCS(filetype, FILETYPE) |
1746 | EXT4_FEATURE_INCOMPAT_FUNCS(journal_needs_recovery, RECOVER) |
1747 | EXT4_FEATURE_INCOMPAT_FUNCS(journal_dev, JOURNAL_DEV) |
1748 | EXT4_FEATURE_INCOMPAT_FUNCS(meta_bg, META_BG) |
1749 | EXT4_FEATURE_INCOMPAT_FUNCS(extents, EXTENTS) |
1750 | EXT4_FEATURE_INCOMPAT_FUNCS(64bit, 64BIT) |
1751 | EXT4_FEATURE_INCOMPAT_FUNCS(mmp, MMP) |
1752 | EXT4_FEATURE_INCOMPAT_FUNCS(flex_bg, FLEX_BG) |
1753 | EXT4_FEATURE_INCOMPAT_FUNCS(ea_inode, EA_INODE) |
1754 | EXT4_FEATURE_INCOMPAT_FUNCS(dirdata, DIRDATA) |
1755 | EXT4_FEATURE_INCOMPAT_FUNCS(csum_seed, CSUM_SEED) |
1756 | EXT4_FEATURE_INCOMPAT_FUNCS(largedir, LARGEDIR) |
1757 | EXT4_FEATURE_INCOMPAT_FUNCS(inline_data, INLINE_DATA) |
1758 | EXT4_FEATURE_INCOMPAT_FUNCS(encrypt, ENCRYPT) |
1759 | |
1760 | #define EXT2_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR |
1761 | #define EXT2_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ |
1762 | EXT4_FEATURE_INCOMPAT_META_BG) |
1763 | #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ |
1764 | EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ |
1765 | EXT4_FEATURE_RO_COMPAT_BTREE_DIR) |
1766 | |
1767 | #define EXT3_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR |
1768 | #define EXT3_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ |
1769 | EXT4_FEATURE_INCOMPAT_RECOVER| \ |
1770 | EXT4_FEATURE_INCOMPAT_META_BG) |
1771 | #define EXT3_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ |
1772 | EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ |
1773 | EXT4_FEATURE_RO_COMPAT_BTREE_DIR) |
1774 | |
1775 | #define EXT4_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR |
1776 | #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ |
1777 | EXT4_FEATURE_INCOMPAT_RECOVER| \ |
1778 | EXT4_FEATURE_INCOMPAT_META_BG| \ |
1779 | EXT4_FEATURE_INCOMPAT_EXTENTS| \ |
1780 | EXT4_FEATURE_INCOMPAT_64BIT| \ |
1781 | EXT4_FEATURE_INCOMPAT_FLEX_BG| \ |
1782 | EXT4_FEATURE_INCOMPAT_EA_INODE| \ |
1783 | EXT4_FEATURE_INCOMPAT_MMP | \ |
1784 | EXT4_FEATURE_INCOMPAT_INLINE_DATA | \ |
1785 | EXT4_FEATURE_INCOMPAT_ENCRYPT | \ |
1786 | EXT4_FEATURE_INCOMPAT_CSUM_SEED | \ |
1787 | EXT4_FEATURE_INCOMPAT_LARGEDIR) |
1788 | #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ |
1789 | EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ |
1790 | EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \ |
1791 | EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \ |
1792 | EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \ |
1793 | EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\ |
1794 | EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\ |
1795 | EXT4_FEATURE_RO_COMPAT_BIGALLOC |\ |
1796 | EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\ |
1797 | EXT4_FEATURE_RO_COMPAT_QUOTA |\ |
1798 | EXT4_FEATURE_RO_COMPAT_PROJECT) |
1799 | |
1800 | #define EXTN_FEATURE_FUNCS(ver) \ |
1801 | static inline bool ext4_has_unknown_ext##ver##_compat_features(struct super_block *sb) \ |
1802 | { \ |
1803 | return ((EXT4_SB(sb)->s_es->s_feature_compat & \ |
1804 | cpu_to_le32(~EXT##ver##_FEATURE_COMPAT_SUPP)) != 0); \ |
1805 | } \ |
1806 | static inline bool ext4_has_unknown_ext##ver##_ro_compat_features(struct super_block *sb) \ |
1807 | { \ |
1808 | return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \ |
1809 | cpu_to_le32(~EXT##ver##_FEATURE_RO_COMPAT_SUPP)) != 0); \ |
1810 | } \ |
1811 | static inline bool ext4_has_unknown_ext##ver##_incompat_features(struct super_block *sb) \ |
1812 | { \ |
1813 | return ((EXT4_SB(sb)->s_es->s_feature_incompat & \ |
1814 | cpu_to_le32(~EXT##ver##_FEATURE_INCOMPAT_SUPP)) != 0); \ |
1815 | } |
1816 | |
1817 | EXTN_FEATURE_FUNCS(2) |
1818 | EXTN_FEATURE_FUNCS(3) |
1819 | EXTN_FEATURE_FUNCS(4) |
1820 | |
1821 | static inline bool ext4_has_compat_features(struct super_block *sb) |
1822 | { |
1823 | return (EXT4_SB(sb)->s_es->s_feature_compat != 0); |
1824 | } |
1825 | static inline bool ext4_has_ro_compat_features(struct super_block *sb) |
1826 | { |
1827 | return (EXT4_SB(sb)->s_es->s_feature_ro_compat != 0); |
1828 | } |
1829 | static inline bool ext4_has_incompat_features(struct super_block *sb) |
1830 | { |
1831 | return (EXT4_SB(sb)->s_es->s_feature_incompat != 0); |
1832 | } |
1833 | |
1834 | /* |
1835 | * Superblock flags |
1836 | */ |
1837 | #define EXT4_FLAGS_RESIZING 0 |
1838 | #define EXT4_FLAGS_SHUTDOWN 1 |
1839 | |
1840 | static inline int ext4_forced_shutdown(struct ext4_sb_info *sbi) |
1841 | { |
1842 | return test_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags); |
1843 | } |
1844 | |
1845 | |
1846 | /* |
1847 | * Default values for user and/or group using reserved blocks |
1848 | */ |
1849 | #define EXT4_DEF_RESUID 0 |
1850 | #define EXT4_DEF_RESGID 0 |
1851 | |
1852 | /* |
1853 | * Default project ID |
1854 | */ |
1855 | #define EXT4_DEF_PROJID 0 |
1856 | |
1857 | #define EXT4_DEF_INODE_READAHEAD_BLKS 32 |
1858 | |
1859 | /* |
1860 | * Default mount options |
1861 | */ |
1862 | #define EXT4_DEFM_DEBUG 0x0001 |
1863 | #define EXT4_DEFM_BSDGROUPS 0x0002 |
1864 | #define EXT4_DEFM_XATTR_USER 0x0004 |
1865 | #define EXT4_DEFM_ACL 0x0008 |
1866 | #define EXT4_DEFM_UID16 0x0010 |
1867 | #define EXT4_DEFM_JMODE 0x0060 |
1868 | #define EXT4_DEFM_JMODE_DATA 0x0020 |
1869 | #define EXT4_DEFM_JMODE_ORDERED 0x0040 |
1870 | #define EXT4_DEFM_JMODE_WBACK 0x0060 |
1871 | #define EXT4_DEFM_NOBARRIER 0x0100 |
1872 | #define EXT4_DEFM_BLOCK_VALIDITY 0x0200 |
1873 | #define EXT4_DEFM_DISCARD 0x0400 |
1874 | #define EXT4_DEFM_NODELALLOC 0x0800 |
1875 | |
1876 | /* |
1877 | * Default journal batch times |
1878 | */ |
1879 | #define EXT4_DEF_MIN_BATCH_TIME 0 |
1880 | #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */ |
1881 | |
1882 | /* |
1883 | * Minimum number of groups in a flexgroup before we separate out |
1884 | * directories into the first block group of a flexgroup |
1885 | */ |
1886 | #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4 |
1887 | |
1888 | /* |
1889 | * Structure of a directory entry |
1890 | */ |
1891 | #define EXT4_NAME_LEN 255 |
1892 | |
1893 | struct ext4_dir_entry { |
1894 | __le32 inode; /* Inode number */ |
1895 | __le16 rec_len; /* Directory entry length */ |
1896 | __le16 name_len; /* Name length */ |
1897 | char name[EXT4_NAME_LEN]; /* File name */ |
1898 | }; |
1899 | |
1900 | /* |
1901 | * The new version of the directory entry. Since EXT4 structures are |
1902 | * stored in intel byte order, and the name_len field could never be |
1903 | * bigger than 255 chars, it's safe to reclaim the extra byte for the |
1904 | * file_type field. |
1905 | */ |
1906 | struct ext4_dir_entry_2 { |
1907 | __le32 inode; /* Inode number */ |
1908 | __le16 rec_len; /* Directory entry length */ |
1909 | __u8 name_len; /* Name length */ |
1910 | __u8 file_type; |
1911 | char name[EXT4_NAME_LEN]; /* File name */ |
1912 | }; |
1913 | |
1914 | /* |
1915 | * This is a bogus directory entry at the end of each leaf block that |
1916 | * records checksums. |
1917 | */ |
1918 | struct ext4_dir_entry_tail { |
1919 | __le32 det_reserved_zero1; /* Pretend to be unused */ |
1920 | __le16 det_rec_len; /* 12 */ |
1921 | __u8 det_reserved_zero2; /* Zero name length */ |
1922 | __u8 det_reserved_ft; /* 0xDE, fake file type */ |
1923 | __le32 det_checksum; /* crc32c(uuid+inum+dirblock) */ |
1924 | }; |
1925 | |
1926 | #define EXT4_DIRENT_TAIL(block, blocksize) \ |
1927 | ((struct ext4_dir_entry_tail *)(((void *)(block)) + \ |
1928 | ((blocksize) - \ |
1929 | sizeof(struct ext4_dir_entry_tail)))) |
1930 | |
1931 | /* |
1932 | * Ext4 directory file types. Only the low 3 bits are used. The |
1933 | * other bits are reserved for now. |
1934 | */ |
1935 | #define EXT4_FT_UNKNOWN 0 |
1936 | #define EXT4_FT_REG_FILE 1 |
1937 | #define EXT4_FT_DIR 2 |
1938 | #define EXT4_FT_CHRDEV 3 |
1939 | #define EXT4_FT_BLKDEV 4 |
1940 | #define EXT4_FT_FIFO 5 |
1941 | #define EXT4_FT_SOCK 6 |
1942 | #define EXT4_FT_SYMLINK 7 |
1943 | |
1944 | #define EXT4_FT_MAX 8 |
1945 | |
1946 | #define EXT4_FT_DIR_CSUM 0xDE |
1947 | |
1948 | /* |
1949 | * EXT4_DIR_PAD defines the directory entries boundaries |
1950 | * |
1951 | * NOTE: It must be a multiple of 4 |
1952 | */ |
1953 | #define EXT4_DIR_PAD 4 |
1954 | #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1) |
1955 | #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \ |
1956 | ~EXT4_DIR_ROUND) |
1957 | #define EXT4_MAX_REC_LEN ((1<<16)-1) |
1958 | |
1959 | /* |
1960 | * If we ever get support for fs block sizes > page_size, we'll need |
1961 | * to remove the #if statements in the next two functions... |
1962 | */ |
1963 | static inline unsigned int |
1964 | ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize) |
1965 | { |
1966 | unsigned len = le16_to_cpu(dlen); |
1967 | |
1968 | #if (PAGE_SIZE >= 65536) |
1969 | if (len == EXT4_MAX_REC_LEN || len == 0) |
1970 | return blocksize; |
1971 | return (len & 65532) | ((len & 3) << 16); |
1972 | #else |
1973 | return len; |
1974 | #endif |
1975 | } |
1976 | |
1977 | static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize) |
1978 | { |
1979 | if ((len > blocksize) || (blocksize > (1 << 18)) || (len & 3)) |
1980 | BUG(); |
1981 | #if (PAGE_SIZE >= 65536) |
1982 | if (len < 65536) |
1983 | return cpu_to_le16(len); |
1984 | if (len == blocksize) { |
1985 | if (blocksize == 65536) |
1986 | return cpu_to_le16(EXT4_MAX_REC_LEN); |
1987 | else |
1988 | return cpu_to_le16(0); |
1989 | } |
1990 | return cpu_to_le16((len & 65532) | ((len >> 16) & 3)); |
1991 | #else |
1992 | return cpu_to_le16(len); |
1993 | #endif |
1994 | } |
1995 | |
1996 | /* |
1997 | * Hash Tree Directory indexing |
1998 | * (c) Daniel Phillips, 2001 |
1999 | */ |
2000 | |
2001 | #define is_dx(dir) (ext4_has_feature_dir_index((dir)->i_sb) && \ |
2002 | ext4_test_inode_flag((dir), EXT4_INODE_INDEX)) |
2003 | #define EXT4_DIR_LINK_MAX(dir) unlikely((dir)->i_nlink >= EXT4_LINK_MAX && \ |
2004 | !(ext4_has_feature_dir_nlink((dir)->i_sb) && is_dx(dir))) |
2005 | #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1) |
2006 | |
2007 | /* Legal values for the dx_root hash_version field: */ |
2008 | |
2009 | #define DX_HASH_LEGACY 0 |
2010 | #define DX_HASH_HALF_MD4 1 |
2011 | #define DX_HASH_TEA 2 |
2012 | #define DX_HASH_LEGACY_UNSIGNED 3 |
2013 | #define DX_HASH_HALF_MD4_UNSIGNED 4 |
2014 | #define DX_HASH_TEA_UNSIGNED 5 |
2015 | |
2016 | static inline u32 ext4_chksum(struct ext4_sb_info *sbi, u32 crc, |
2017 | const void *address, unsigned int length) |
2018 | { |
2019 | struct { |
2020 | struct shash_desc shash; |
2021 | char ctx[4]; |
2022 | } desc; |
2023 | |
2024 | BUG_ON(crypto_shash_descsize(sbi->s_chksum_driver)!=sizeof(desc.ctx)); |
2025 | |
2026 | desc.shash.tfm = sbi->s_chksum_driver; |
2027 | desc.shash.flags = 0; |
2028 | *(u32 *)desc.ctx = crc; |
2029 | |
2030 | BUG_ON(crypto_shash_update(&desc.shash, address, length)); |
2031 | |
2032 | return *(u32 *)desc.ctx; |
2033 | } |
2034 | |
2035 | #ifdef __KERNEL__ |
2036 | |
2037 | /* hash info structure used by the directory hash */ |
2038 | struct dx_hash_info |
2039 | { |
2040 | u32 hash; |
2041 | u32 minor_hash; |
2042 | int hash_version; |
2043 | u32 *seed; |
2044 | }; |
2045 | |
2046 | |
2047 | /* 32 and 64 bit signed EOF for dx directories */ |
2048 | #define EXT4_HTREE_EOF_32BIT ((1UL << (32 - 1)) - 1) |
2049 | #define EXT4_HTREE_EOF_64BIT ((1ULL << (64 - 1)) - 1) |
2050 | |
2051 | |
2052 | /* |
2053 | * Control parameters used by ext4_htree_next_block |
2054 | */ |
2055 | #define HASH_NB_ALWAYS 1 |
2056 | |
2057 | struct ext4_filename { |
2058 | const struct qstr *usr_fname; |
2059 | struct fscrypt_str disk_name; |
2060 | struct dx_hash_info hinfo; |
2061 | #ifdef CONFIG_FS_ENCRYPTION |
2062 | struct fscrypt_str crypto_buf; |
2063 | #endif |
2064 | }; |
2065 | |
2066 | #define fname_name(p) ((p)->disk_name.name) |
2067 | #define fname_len(p) ((p)->disk_name.len) |
2068 | |
2069 | /* |
2070 | * Describe an inode's exact location on disk and in memory |
2071 | */ |
2072 | struct ext4_iloc |
2073 | { |
2074 | struct buffer_head *bh; |
2075 | unsigned long offset; |
2076 | ext4_group_t block_group; |
2077 | }; |
2078 | |
2079 | static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc) |
2080 | { |
2081 | return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset); |
2082 | } |
2083 | |
2084 | static inline bool ext4_is_quota_file(struct inode *inode) |
2085 | { |
2086 | return IS_NOQUOTA(inode) && |
2087 | !(EXT4_I(inode)->i_flags & EXT4_EA_INODE_FL); |
2088 | } |
2089 | |
2090 | /* |
2091 | * This structure is stuffed into the struct file's private_data field |
2092 | * for directories. It is where we put information so that we can do |
2093 | * readdir operations in hash tree order. |
2094 | */ |
2095 | struct dir_private_info { |
2096 | struct rb_root root; |
2097 | struct rb_node *curr_node; |
2098 | struct fname *; |
2099 | loff_t last_pos; |
2100 | __u32 curr_hash; |
2101 | __u32 curr_minor_hash; |
2102 | __u32 next_hash; |
2103 | }; |
2104 | |
2105 | /* calculate the first block number of the group */ |
2106 | static inline ext4_fsblk_t |
2107 | ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no) |
2108 | { |
2109 | return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) + |
2110 | le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block); |
2111 | } |
2112 | |
2113 | /* |
2114 | * Special error return code only used by dx_probe() and its callers. |
2115 | */ |
2116 | #define ERR_BAD_DX_DIR (-(MAX_ERRNO - 1)) |
2117 | |
2118 | /* htree levels for ext4 */ |
2119 | #define EXT4_HTREE_LEVEL_COMPAT 2 |
2120 | #define EXT4_HTREE_LEVEL 3 |
2121 | |
2122 | static inline int ext4_dir_htree_level(struct super_block *sb) |
2123 | { |
2124 | return ext4_has_feature_largedir(sb) ? |
2125 | EXT4_HTREE_LEVEL : EXT4_HTREE_LEVEL_COMPAT; |
2126 | } |
2127 | |
2128 | /* |
2129 | * Timeout and state flag for lazy initialization inode thread. |
2130 | */ |
2131 | #define EXT4_DEF_LI_WAIT_MULT 10 |
2132 | #define EXT4_DEF_LI_MAX_START_DELAY 5 |
2133 | #define EXT4_LAZYINIT_QUIT 0x0001 |
2134 | #define EXT4_LAZYINIT_RUNNING 0x0002 |
2135 | |
2136 | /* |
2137 | * Lazy inode table initialization info |
2138 | */ |
2139 | struct ext4_lazy_init { |
2140 | unsigned long li_state; |
2141 | struct list_head li_request_list; |
2142 | struct mutex li_list_mtx; |
2143 | }; |
2144 | |
2145 | struct ext4_li_request { |
2146 | struct super_block *lr_super; |
2147 | struct ext4_sb_info *lr_sbi; |
2148 | ext4_group_t lr_next_group; |
2149 | struct list_head lr_request; |
2150 | unsigned long lr_next_sched; |
2151 | unsigned long lr_timeout; |
2152 | }; |
2153 | |
2154 | struct ext4_features { |
2155 | struct kobject f_kobj; |
2156 | struct completion f_kobj_unregister; |
2157 | }; |
2158 | |
2159 | /* |
2160 | * This structure will be used for multiple mount protection. It will be |
2161 | * written into the block number saved in the s_mmp_block field in the |
2162 | * superblock. Programs that check MMP should assume that if |
2163 | * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe |
2164 | * to use the filesystem, regardless of how old the timestamp is. |
2165 | */ |
2166 | #define EXT4_MMP_MAGIC 0x004D4D50U /* ASCII for MMP */ |
2167 | #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */ |
2168 | #define EXT4_MMP_SEQ_FSCK 0xE24D4D50U /* mmp_seq value when being fscked */ |
2169 | #define EXT4_MMP_SEQ_MAX 0xE24D4D4FU /* maximum valid mmp_seq value */ |
2170 | |
2171 | struct mmp_struct { |
2172 | __le32 mmp_magic; /* Magic number for MMP */ |
2173 | __le32 mmp_seq; /* Sequence no. updated periodically */ |
2174 | |
2175 | /* |
2176 | * mmp_time, mmp_nodename & mmp_bdevname are only used for information |
2177 | * purposes and do not affect the correctness of the algorithm |
2178 | */ |
2179 | __le64 mmp_time; /* Time last updated */ |
2180 | char mmp_nodename[64]; /* Node which last updated MMP block */ |
2181 | char mmp_bdevname[32]; /* Bdev which last updated MMP block */ |
2182 | |
2183 | /* |
2184 | * mmp_check_interval is used to verify if the MMP block has been |
2185 | * updated on the block device. The value is updated based on the |
2186 | * maximum time to write the MMP block during an update cycle. |
2187 | */ |
2188 | __le16 mmp_check_interval; |
2189 | |
2190 | __le16 mmp_pad1; |
2191 | __le32 mmp_pad2[226]; |
2192 | __le32 mmp_checksum; /* crc32c(uuid+mmp_block) */ |
2193 | }; |
2194 | |
2195 | /* arguments passed to the mmp thread */ |
2196 | struct mmpd_data { |
2197 | struct buffer_head *bh; /* bh from initial read_mmp_block() */ |
2198 | struct super_block *sb; /* super block of the fs */ |
2199 | }; |
2200 | |
2201 | /* |
2202 | * Check interval multiplier |
2203 | * The MMP block is written every update interval and initially checked every |
2204 | * update interval x the multiplier (the value is then adapted based on the |
2205 | * write latency). The reason is that writes can be delayed under load and we |
2206 | * don't want readers to incorrectly assume that the filesystem is no longer |
2207 | * in use. |
2208 | */ |
2209 | #define EXT4_MMP_CHECK_MULT 2UL |
2210 | |
2211 | /* |
2212 | * Minimum interval for MMP checking in seconds. |
2213 | */ |
2214 | #define EXT4_MMP_MIN_CHECK_INTERVAL 5UL |
2215 | |
2216 | /* |
2217 | * Maximum interval for MMP checking in seconds. |
2218 | */ |
2219 | #define EXT4_MMP_MAX_CHECK_INTERVAL 300UL |
2220 | |
2221 | /* |
2222 | * Function prototypes |
2223 | */ |
2224 | |
2225 | /* |
2226 | * Ok, these declarations are also in <linux/kernel.h> but none of the |
2227 | * ext4 source programs needs to include it so they are duplicated here. |
2228 | */ |
2229 | # define NORET_TYPE /**/ |
2230 | # define ATTRIB_NORET __attribute__((noreturn)) |
2231 | # define NORET_AND noreturn, |
2232 | |
2233 | /* bitmap.c */ |
2234 | extern unsigned int ext4_count_free(char *bitmap, unsigned numchars); |
2235 | void ext4_inode_bitmap_csum_set(struct super_block *sb, ext4_group_t group, |
2236 | struct ext4_group_desc *gdp, |
2237 | struct buffer_head *bh, int sz); |
2238 | int ext4_inode_bitmap_csum_verify(struct super_block *sb, ext4_group_t group, |
2239 | struct ext4_group_desc *gdp, |
2240 | struct buffer_head *bh, int sz); |
2241 | void ext4_block_bitmap_csum_set(struct super_block *sb, ext4_group_t group, |
2242 | struct ext4_group_desc *gdp, |
2243 | struct buffer_head *bh); |
2244 | int ext4_block_bitmap_csum_verify(struct super_block *sb, ext4_group_t group, |
2245 | struct ext4_group_desc *gdp, |
2246 | struct buffer_head *bh); |
2247 | |
2248 | /* balloc.c */ |
2249 | extern void ext4_get_group_no_and_offset(struct super_block *sb, |
2250 | ext4_fsblk_t blocknr, |
2251 | ext4_group_t *blockgrpp, |
2252 | ext4_grpblk_t *offsetp); |
2253 | extern ext4_group_t ext4_get_group_number(struct super_block *sb, |
2254 | ext4_fsblk_t block); |
2255 | |
2256 | extern unsigned int ext4_block_group(struct super_block *sb, |
2257 | ext4_fsblk_t blocknr); |
2258 | extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb, |
2259 | ext4_fsblk_t blocknr); |
2260 | extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group); |
2261 | extern unsigned long ext4_bg_num_gdb(struct super_block *sb, |
2262 | ext4_group_t group); |
2263 | extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode, |
2264 | ext4_fsblk_t goal, |
2265 | unsigned int flags, |
2266 | unsigned long *count, |
2267 | int *errp); |
2268 | extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi, |
2269 | s64 nclusters, unsigned int flags); |
2270 | extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *); |
2271 | extern void ext4_check_blocks_bitmap(struct super_block *); |
2272 | extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb, |
2273 | ext4_group_t block_group, |
2274 | struct buffer_head ** bh); |
2275 | extern int ext4_should_retry_alloc(struct super_block *sb, int *retries); |
2276 | |
2277 | extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb, |
2278 | ext4_group_t block_group); |
2279 | extern int ext4_wait_block_bitmap(struct super_block *sb, |
2280 | ext4_group_t block_group, |
2281 | struct buffer_head *bh); |
2282 | extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb, |
2283 | ext4_group_t block_group); |
2284 | extern unsigned ext4_free_clusters_after_init(struct super_block *sb, |
2285 | ext4_group_t block_group, |
2286 | struct ext4_group_desc *gdp); |
2287 | ext4_fsblk_t ext4_inode_to_goal_block(struct inode *); |
2288 | |
2289 | #ifdef CONFIG_FS_ENCRYPTION |
2290 | static inline int ext4_fname_setup_filename(struct inode *dir, |
2291 | const struct qstr *iname, |
2292 | int lookup, struct ext4_filename *fname) |
2293 | { |
2294 | struct fscrypt_name name; |
2295 | int err; |
2296 | |
2297 | memset(fname, 0, sizeof(struct ext4_filename)); |
2298 | |
2299 | err = fscrypt_setup_filename(dir, iname, lookup, &name); |
2300 | |
2301 | fname->usr_fname = name.usr_fname; |
2302 | fname->disk_name = name.disk_name; |
2303 | fname->hinfo.hash = name.hash; |
2304 | fname->hinfo.minor_hash = name.minor_hash; |
2305 | fname->crypto_buf = name.crypto_buf; |
2306 | return err; |
2307 | } |
2308 | |
2309 | static inline void ext4_fname_free_filename(struct ext4_filename *fname) |
2310 | { |
2311 | struct fscrypt_name name; |
2312 | |
2313 | name.crypto_buf = fname->crypto_buf; |
2314 | fscrypt_free_filename(&name); |
2315 | |
2316 | fname->crypto_buf.name = NULL; |
2317 | fname->usr_fname = NULL; |
2318 | fname->disk_name.name = NULL; |
2319 | } |
2320 | #else |
2321 | static inline int ext4_fname_setup_filename(struct inode *dir, |
2322 | const struct qstr *iname, |
2323 | int lookup, struct ext4_filename *fname) |
2324 | { |
2325 | fname->usr_fname = iname; |
2326 | fname->disk_name.name = (unsigned char *) iname->name; |
2327 | fname->disk_name.len = iname->len; |
2328 | return 0; |
2329 | } |
2330 | static inline void ext4_fname_free_filename(struct ext4_filename *fname) { } |
2331 | |
2332 | #endif |
2333 | |
2334 | /* dir.c */ |
2335 | extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *, |
2336 | struct file *, |
2337 | struct ext4_dir_entry_2 *, |
2338 | struct buffer_head *, char *, int, |
2339 | unsigned int); |
2340 | #define ext4_check_dir_entry(dir, filp, de, bh, buf, size, offset) \ |
2341 | unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \ |
2342 | (de), (bh), (buf), (size), (offset))) |
2343 | extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash, |
2344 | __u32 minor_hash, |
2345 | struct ext4_dir_entry_2 *dirent, |
2346 | struct fscrypt_str *ent_name); |
2347 | extern void ext4_htree_free_dir_info(struct dir_private_info *p); |
2348 | extern int ext4_find_dest_de(struct inode *dir, struct inode *inode, |
2349 | struct buffer_head *bh, |
2350 | void *buf, int buf_size, |
2351 | struct ext4_filename *fname, |
2352 | struct ext4_dir_entry_2 **dest_de); |
2353 | void ext4_insert_dentry(struct inode *inode, |
2354 | struct ext4_dir_entry_2 *de, |
2355 | int buf_size, |
2356 | struct ext4_filename *fname); |
2357 | static inline void ext4_update_dx_flag(struct inode *inode) |
2358 | { |
2359 | if (!ext4_has_feature_dir_index(inode->i_sb)) |
2360 | ext4_clear_inode_flag(inode, EXT4_INODE_INDEX); |
2361 | } |
2362 | static const unsigned char ext4_filetype_table[] = { |
2363 | DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK |
2364 | }; |
2365 | |
2366 | static inline unsigned char get_dtype(struct super_block *sb, int filetype) |
2367 | { |
2368 | if (!ext4_has_feature_filetype(sb) || filetype >= EXT4_FT_MAX) |
2369 | return DT_UNKNOWN; |
2370 | |
2371 | return ext4_filetype_table[filetype]; |
2372 | } |
2373 | extern int ext4_check_all_de(struct inode *dir, struct buffer_head *bh, |
2374 | void *buf, int buf_size); |
2375 | |
2376 | /* fsync.c */ |
2377 | extern int ext4_sync_file(struct file *, loff_t, loff_t, int); |
2378 | |
2379 | /* hash.c */ |
2380 | extern int ext4fs_dirhash(const char *name, int len, struct |
2381 | dx_hash_info *hinfo); |
2382 | |
2383 | /* ialloc.c */ |
2384 | extern struct inode *__ext4_new_inode(handle_t *, struct inode *, umode_t, |
2385 | const struct qstr *qstr, __u32 goal, |
2386 | uid_t *owner, __u32 i_flags, |
2387 | int handle_type, unsigned int line_no, |
2388 | int nblocks); |
2389 | |
2390 | #define ext4_new_inode(handle, dir, mode, qstr, goal, owner, i_flags) \ |
2391 | __ext4_new_inode((handle), (dir), (mode), (qstr), (goal), (owner), \ |
2392 | i_flags, 0, 0, 0) |
2393 | #define ext4_new_inode_start_handle(dir, mode, qstr, goal, owner, \ |
2394 | type, nblocks) \ |
2395 | __ext4_new_inode(NULL, (dir), (mode), (qstr), (goal), (owner), \ |
2396 | 0, (type), __LINE__, (nblocks)) |
2397 | |
2398 | |
2399 | extern void ext4_free_inode(handle_t *, struct inode *); |
2400 | extern struct inode * ext4_orphan_get(struct super_block *, unsigned long); |
2401 | extern unsigned long ext4_count_free_inodes(struct super_block *); |
2402 | extern unsigned long ext4_count_dirs(struct super_block *); |
2403 | extern void ext4_check_inodes_bitmap(struct super_block *); |
2404 | extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap); |
2405 | extern int ext4_init_inode_table(struct super_block *sb, |
2406 | ext4_group_t group, int barrier); |
2407 | extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate); |
2408 | |
2409 | /* mballoc.c */ |
2410 | extern const struct seq_operations ext4_mb_seq_groups_ops; |
2411 | extern long ext4_mb_stats; |
2412 | extern long ext4_mb_max_to_scan; |
2413 | extern int ext4_mb_init(struct super_block *); |
2414 | extern int ext4_mb_release(struct super_block *); |
2415 | extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *, |
2416 | struct ext4_allocation_request *, int *); |
2417 | extern int ext4_mb_reserve_blocks(struct super_block *, int); |
2418 | extern void ext4_discard_preallocations(struct inode *); |
2419 | extern int __init ext4_init_mballoc(void); |
2420 | extern void ext4_exit_mballoc(void); |
2421 | extern void ext4_free_blocks(handle_t *handle, struct inode *inode, |
2422 | struct buffer_head *bh, ext4_fsblk_t block, |
2423 | unsigned long count, int flags); |
2424 | extern int ext4_mb_alloc_groupinfo(struct super_block *sb, |
2425 | ext4_group_t ngroups); |
2426 | extern int ext4_mb_add_groupinfo(struct super_block *sb, |
2427 | ext4_group_t i, struct ext4_group_desc *desc); |
2428 | extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb, |
2429 | ext4_fsblk_t block, unsigned long count); |
2430 | extern int ext4_trim_fs(struct super_block *, struct fstrim_range *); |
2431 | extern void ext4_process_freed_data(struct super_block *sb, tid_t commit_tid); |
2432 | |
2433 | /* inode.c */ |
2434 | int ext4_inode_is_fast_symlink(struct inode *inode); |
2435 | struct buffer_head *ext4_getblk(handle_t *, struct inode *, ext4_lblk_t, int); |
2436 | struct buffer_head *ext4_bread(handle_t *, struct inode *, ext4_lblk_t, int); |
2437 | int ext4_bread_batch(struct inode *inode, ext4_lblk_t block, int bh_count, |
2438 | bool wait, struct buffer_head **bhs); |
2439 | int ext4_get_block_unwritten(struct inode *inode, sector_t iblock, |
2440 | struct buffer_head *bh_result, int create); |
2441 | int ext4_get_block(struct inode *inode, sector_t iblock, |
2442 | struct buffer_head *bh_result, int create); |
2443 | int ext4_dio_get_block(struct inode *inode, sector_t iblock, |
2444 | struct buffer_head *bh_result, int create); |
2445 | int ext4_da_get_block_prep(struct inode *inode, sector_t iblock, |
2446 | struct buffer_head *bh, int create); |
2447 | int ext4_walk_page_buffers(handle_t *handle, |
2448 | struct buffer_head *head, |
2449 | unsigned from, |
2450 | unsigned to, |
2451 | int *partial, |
2452 | int (*fn)(handle_t *handle, |
2453 | struct buffer_head *bh)); |
2454 | int do_journal_get_write_access(handle_t *handle, |
2455 | struct buffer_head *bh); |
2456 | #define FALL_BACK_TO_NONDELALLOC 1 |
2457 | #define CONVERT_INLINE_DATA 2 |
2458 | |
2459 | typedef enum { |
2460 | EXT4_IGET_NORMAL = 0, |
2461 | EXT4_IGET_SPECIAL = 0x0001, /* OK to iget a system inode */ |
2462 | EXT4_IGET_HANDLE = 0x0002 /* Inode # is from a handle */ |
2463 | } ext4_iget_flags; |
2464 | |
2465 | extern struct inode *__ext4_iget(struct super_block *sb, unsigned long ino, |
2466 | ext4_iget_flags flags, const char *function, |
2467 | unsigned int line); |
2468 | |
2469 | #define ext4_iget(sb, ino, flags) \ |
2470 | __ext4_iget((sb), (ino), (flags), __func__, __LINE__) |
2471 | |
2472 | extern int ext4_write_inode(struct inode *, struct writeback_control *); |
2473 | extern int ext4_setattr(struct dentry *, struct iattr *); |
2474 | extern int ext4_getattr(const struct path *, struct kstat *, u32, unsigned int); |
2475 | extern void ext4_evict_inode(struct inode *); |
2476 | extern void ext4_clear_inode(struct inode *); |
2477 | extern int ext4_file_getattr(const struct path *, struct kstat *, u32, unsigned int); |
2478 | extern int ext4_sync_inode(handle_t *, struct inode *); |
2479 | extern void ext4_dirty_inode(struct inode *, int); |
2480 | extern int ext4_change_inode_journal_flag(struct inode *, int); |
2481 | extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *); |
2482 | extern int ext4_inode_attach_jinode(struct inode *inode); |
2483 | extern int ext4_can_truncate(struct inode *inode); |
2484 | extern int ext4_truncate(struct inode *); |
2485 | extern int ext4_break_layouts(struct inode *); |
2486 | extern int ext4_punch_hole(struct inode *inode, loff_t offset, loff_t length); |
2487 | extern int ext4_truncate_restart_trans(handle_t *, struct inode *, int nblocks); |
2488 | extern void ext4_set_inode_flags(struct inode *); |
2489 | extern int ext4_alloc_da_blocks(struct inode *inode); |
2490 | extern void ext4_set_aops(struct inode *inode); |
2491 | extern int ext4_writepage_trans_blocks(struct inode *); |
2492 | extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks); |
2493 | extern int ext4_zero_partial_blocks(handle_t *handle, struct inode *inode, |
2494 | loff_t lstart, loff_t lend); |
2495 | extern vm_fault_t ext4_page_mkwrite(struct vm_fault *vmf); |
2496 | extern vm_fault_t ext4_filemap_fault(struct vm_fault *vmf); |
2497 | extern qsize_t *ext4_get_reserved_space(struct inode *inode); |
2498 | extern int ext4_get_projid(struct inode *inode, kprojid_t *projid); |
2499 | extern void ext4_da_release_space(struct inode *inode, int to_free); |
2500 | extern void ext4_da_update_reserve_space(struct inode *inode, |
2501 | int used, int quota_claim); |
2502 | extern int ext4_issue_zeroout(struct inode *inode, ext4_lblk_t lblk, |
2503 | ext4_fsblk_t pblk, ext4_lblk_t len); |
2504 | |
2505 | /* indirect.c */ |
2506 | extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode, |
2507 | struct ext4_map_blocks *map, int flags); |
2508 | extern int ext4_ind_calc_metadata_amount(struct inode *inode, sector_t lblock); |
2509 | extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks); |
2510 | extern void ext4_ind_truncate(handle_t *, struct inode *inode); |
2511 | extern int ext4_ind_remove_space(handle_t *handle, struct inode *inode, |
2512 | ext4_lblk_t start, ext4_lblk_t end); |
2513 | |
2514 | /* ioctl.c */ |
2515 | extern long ext4_ioctl(struct file *, unsigned int, unsigned long); |
2516 | extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long); |
2517 | |
2518 | /* migrate.c */ |
2519 | extern int ext4_ext_migrate(struct inode *); |
2520 | extern int ext4_ind_migrate(struct inode *inode); |
2521 | |
2522 | /* namei.c */ |
2523 | extern int ext4_dirent_csum_verify(struct inode *inode, |
2524 | struct ext4_dir_entry *dirent); |
2525 | extern int ext4_orphan_add(handle_t *, struct inode *); |
2526 | extern int ext4_orphan_del(handle_t *, struct inode *); |
2527 | extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash, |
2528 | __u32 start_minor_hash, __u32 *next_hash); |
2529 | extern int ext4_search_dir(struct buffer_head *bh, |
2530 | char *search_buf, |
2531 | int buf_size, |
2532 | struct inode *dir, |
2533 | struct ext4_filename *fname, |
2534 | unsigned int offset, |
2535 | struct ext4_dir_entry_2 **res_dir); |
2536 | extern int ext4_generic_delete_entry(handle_t *handle, |
2537 | struct inode *dir, |
2538 | struct ext4_dir_entry_2 *de_del, |
2539 | struct buffer_head *bh, |
2540 | void *entry_buf, |
2541 | int buf_size, |
2542 | int csum_size); |
2543 | extern bool ext4_empty_dir(struct inode *inode); |
2544 | |
2545 | /* resize.c */ |
2546 | extern int ext4_group_add(struct super_block *sb, |
2547 | struct ext4_new_group_data *input); |
2548 | extern int ext4_group_extend(struct super_block *sb, |
2549 | struct ext4_super_block *es, |
2550 | ext4_fsblk_t n_blocks_count); |
2551 | extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count); |
2552 | |
2553 | /* super.c */ |
2554 | extern struct buffer_head *ext4_sb_bread(struct super_block *sb, |
2555 | sector_t block, int op_flags); |
2556 | extern int ext4_seq_options_show(struct seq_file *seq, void *offset); |
2557 | extern int ext4_calculate_overhead(struct super_block *sb); |
2558 | extern void ext4_superblock_csum_set(struct super_block *sb); |
2559 | extern void *ext4_kvmalloc(size_t size, gfp_t flags); |
2560 | extern void *ext4_kvzalloc(size_t size, gfp_t flags); |
2561 | extern int ext4_alloc_flex_bg_array(struct super_block *sb, |
2562 | ext4_group_t ngroup); |
2563 | extern const char *ext4_decode_error(struct super_block *sb, int errno, |
2564 | char nbuf[16]); |
2565 | extern void ext4_mark_group_bitmap_corrupted(struct super_block *sb, |
2566 | ext4_group_t block_group, |
2567 | unsigned int flags); |
2568 | |
2569 | extern __printf(4, 5) |
2570 | void __ext4_error(struct super_block *, const char *, unsigned int, |
2571 | const char *, ...); |
2572 | extern __printf(5, 6) |
2573 | void __ext4_error_inode(struct inode *, const char *, unsigned int, ext4_fsblk_t, |
2574 | const char *, ...); |
2575 | extern __printf(5, 6) |
2576 | void __ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t, |
2577 | const char *, ...); |
2578 | extern void __ext4_std_error(struct super_block *, const char *, |
2579 | unsigned int, int); |
2580 | extern __printf(4, 5) |
2581 | void __ext4_abort(struct super_block *, const char *, unsigned int, |
2582 | const char *, ...); |
2583 | extern __printf(4, 5) |
2584 | void __ext4_warning(struct super_block *, const char *, unsigned int, |
2585 | const char *, ...); |
2586 | extern __printf(4, 5) |
2587 | void __ext4_warning_inode(const struct inode *inode, const char *function, |
2588 | unsigned int line, const char *fmt, ...); |
2589 | extern __printf(3, 4) |
2590 | void __ext4_msg(struct super_block *, const char *, const char *, ...); |
2591 | extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp, |
2592 | const char *, unsigned int, const char *); |
2593 | extern __printf(7, 8) |
2594 | void __ext4_grp_locked_error(const char *, unsigned int, |
2595 | struct super_block *, ext4_group_t, |
2596 | unsigned long, ext4_fsblk_t, |
2597 | const char *, ...); |
2598 | |
2599 | #define EXT4_ERROR_INODE(inode, fmt, a...) \ |
2600 | ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a) |
2601 | |
2602 | #define EXT4_ERROR_INODE_BLOCK(inode, block, fmt, a...) \ |
2603 | ext4_error_inode((inode), __func__, __LINE__, (block), (fmt), ## a) |
2604 | |
2605 | #define EXT4_ERROR_FILE(file, block, fmt, a...) \ |
2606 | ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a) |
2607 | |
2608 | #ifdef CONFIG_PRINTK |
2609 | |
2610 | #define ext4_error_inode(inode, func, line, block, fmt, ...) \ |
2611 | __ext4_error_inode(inode, func, line, block, fmt, ##__VA_ARGS__) |
2612 | #define ext4_error_file(file, func, line, block, fmt, ...) \ |
2613 | __ext4_error_file(file, func, line, block, fmt, ##__VA_ARGS__) |
2614 | #define ext4_error(sb, fmt, ...) \ |
2615 | __ext4_error(sb, __func__, __LINE__, fmt, ##__VA_ARGS__) |
2616 | #define ext4_abort(sb, fmt, ...) \ |
2617 | __ext4_abort(sb, __func__, __LINE__, fmt, ##__VA_ARGS__) |
2618 | #define ext4_warning(sb, fmt, ...) \ |
2619 | __ext4_warning(sb, __func__, __LINE__, fmt, ##__VA_ARGS__) |
2620 | #define ext4_warning_inode(inode, fmt, ...) \ |
2621 | __ext4_warning_inode(inode, __func__, __LINE__, fmt, ##__VA_ARGS__) |
2622 | #define ext4_msg(sb, level, fmt, ...) \ |
2623 | __ext4_msg(sb, level, fmt, ##__VA_ARGS__) |
2624 | #define dump_mmp_msg(sb, mmp, msg) \ |
2625 | __dump_mmp_msg(sb, mmp, __func__, __LINE__, msg) |
2626 | #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \ |
2627 | __ext4_grp_locked_error(__func__, __LINE__, sb, grp, ino, block, \ |
2628 | fmt, ##__VA_ARGS__) |
2629 | |
2630 | #else |
2631 | |
2632 | #define ext4_error_inode(inode, func, line, block, fmt, ...) \ |
2633 | do { \ |
2634 | no_printk(fmt, ##__VA_ARGS__); \ |
2635 | __ext4_error_inode(inode, "", 0, block, " "); \ |
2636 | } while (0) |
2637 | #define ext4_error_file(file, func, line, block, fmt, ...) \ |
2638 | do { \ |
2639 | no_printk(fmt, ##__VA_ARGS__); \ |
2640 | __ext4_error_file(file, "", 0, block, " "); \ |
2641 | } while (0) |
2642 | #define ext4_error(sb, fmt, ...) \ |
2643 | do { \ |
2644 | no_printk(fmt, ##__VA_ARGS__); \ |
2645 | __ext4_error(sb, "", 0, " "); \ |
2646 | } while (0) |
2647 | #define ext4_abort(sb, fmt, ...) \ |
2648 | do { \ |
2649 | no_printk(fmt, ##__VA_ARGS__); \ |
2650 | __ext4_abort(sb, "", 0, " "); \ |
2651 | } while (0) |
2652 | #define ext4_warning(sb, fmt, ...) \ |
2653 | do { \ |
2654 | no_printk(fmt, ##__VA_ARGS__); \ |
2655 | __ext4_warning(sb, "", 0, " "); \ |
2656 | } while (0) |
2657 | #define ext4_warning_inode(inode, fmt, ...) \ |
2658 | do { \ |
2659 | no_printk(fmt, ##__VA_ARGS__); \ |
2660 | __ext4_warning_inode(inode, "", 0, " "); \ |
2661 | } while (0) |
2662 | #define ext4_msg(sb, level, fmt, ...) \ |
2663 | do { \ |
2664 | no_printk(fmt, ##__VA_ARGS__); \ |
2665 | __ext4_msg(sb, "", " "); \ |
2666 | } while (0) |
2667 | #define dump_mmp_msg(sb, mmp, msg) \ |
2668 | __dump_mmp_msg(sb, mmp, "", 0, "") |
2669 | #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \ |
2670 | do { \ |
2671 | no_printk(fmt, ##__VA_ARGS__); \ |
2672 | __ext4_grp_locked_error("", 0, sb, grp, ino, block, " "); \ |
2673 | } while (0) |
2674 | |
2675 | #endif |
2676 | |
2677 | extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb, |
2678 | __u32 compat); |
2679 | extern int ext4_update_rocompat_feature(handle_t *handle, |
2680 | struct super_block *sb, __u32 rocompat); |
2681 | extern int ext4_update_incompat_feature(handle_t *handle, |
2682 | struct super_block *sb, __u32 incompat); |
2683 | extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb, |
2684 | struct ext4_group_desc *bg); |
2685 | extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb, |
2686 | struct ext4_group_desc *bg); |
2687 | extern ext4_fsblk_t ext4_inode_table(struct super_block *sb, |
2688 | struct ext4_group_desc *bg); |
2689 | extern __u32 ext4_free_group_clusters(struct super_block *sb, |
2690 | struct ext4_group_desc *bg); |
2691 | extern __u32 ext4_free_inodes_count(struct super_block *sb, |
2692 | struct ext4_group_desc *bg); |
2693 | extern __u32 ext4_used_dirs_count(struct super_block *sb, |
2694 | struct ext4_group_desc *bg); |
2695 | extern __u32 ext4_itable_unused_count(struct super_block *sb, |
2696 | struct ext4_group_desc *bg); |
2697 | extern void ext4_block_bitmap_set(struct super_block *sb, |
2698 | struct ext4_group_desc *bg, ext4_fsblk_t blk); |
2699 | extern void ext4_inode_bitmap_set(struct super_block *sb, |
2700 | struct ext4_group_desc *bg, ext4_fsblk_t blk); |
2701 | extern void ext4_inode_table_set(struct super_block *sb, |
2702 | struct ext4_group_desc *bg, ext4_fsblk_t blk); |
2703 | extern void ext4_free_group_clusters_set(struct super_block *sb, |
2704 | struct ext4_group_desc *bg, |
2705 | __u32 count); |
2706 | extern void ext4_free_inodes_set(struct super_block *sb, |
2707 | struct ext4_group_desc *bg, __u32 count); |
2708 | extern void ext4_used_dirs_set(struct super_block *sb, |
2709 | struct ext4_group_desc *bg, __u32 count); |
2710 | extern void ext4_itable_unused_set(struct super_block *sb, |
2711 | struct ext4_group_desc *bg, __u32 count); |
2712 | extern int ext4_group_desc_csum_verify(struct super_block *sb, __u32 group, |
2713 | struct ext4_group_desc *gdp); |
2714 | extern void ext4_group_desc_csum_set(struct super_block *sb, __u32 group, |
2715 | struct ext4_group_desc *gdp); |
2716 | extern int ext4_register_li_request(struct super_block *sb, |
2717 | ext4_group_t first_not_zeroed); |
2718 | |
2719 | static inline int ext4_has_metadata_csum(struct super_block *sb) |
2720 | { |
2721 | WARN_ON_ONCE(ext4_has_feature_metadata_csum(sb) && |
2722 | !EXT4_SB(sb)->s_chksum_driver); |
2723 | |
2724 | return ext4_has_feature_metadata_csum(sb) && |
2725 | (EXT4_SB(sb)->s_chksum_driver != NULL); |
2726 | } |
2727 | |
2728 | static inline int ext4_has_group_desc_csum(struct super_block *sb) |
2729 | { |
2730 | return ext4_has_feature_gdt_csum(sb) || ext4_has_metadata_csum(sb); |
2731 | } |
2732 | |
2733 | static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es) |
2734 | { |
2735 | return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) | |
2736 | le32_to_cpu(es->s_blocks_count_lo); |
2737 | } |
2738 | |
2739 | static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es) |
2740 | { |
2741 | return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) | |
2742 | le32_to_cpu(es->s_r_blocks_count_lo); |
2743 | } |
2744 | |
2745 | static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es) |
2746 | { |
2747 | return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) | |
2748 | le32_to_cpu(es->s_free_blocks_count_lo); |
2749 | } |
2750 | |
2751 | static inline void ext4_blocks_count_set(struct ext4_super_block *es, |
2752 | ext4_fsblk_t blk) |
2753 | { |
2754 | es->s_blocks_count_lo = cpu_to_le32((u32)blk); |
2755 | es->s_blocks_count_hi = cpu_to_le32(blk >> 32); |
2756 | } |
2757 | |
2758 | static inline void ext4_free_blocks_count_set(struct ext4_super_block *es, |
2759 | ext4_fsblk_t blk) |
2760 | { |
2761 | es->s_free_blocks_count_lo = cpu_to_le32((u32)blk); |
2762 | es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32); |
2763 | } |
2764 | |
2765 | static inline void ext4_r_blocks_count_set(struct ext4_super_block *es, |
2766 | ext4_fsblk_t blk) |
2767 | { |
2768 | es->s_r_blocks_count_lo = cpu_to_le32((u32)blk); |
2769 | es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32); |
2770 | } |
2771 | |
2772 | static inline loff_t ext4_isize(struct super_block *sb, |
2773 | struct ext4_inode *raw_inode) |
2774 | { |
2775 | if (ext4_has_feature_largedir(sb) || |
2776 | S_ISREG(le16_to_cpu(raw_inode->i_mode))) |
2777 | return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) | |
2778 | le32_to_cpu(raw_inode->i_size_lo); |
2779 | |
2780 | return (loff_t) le32_to_cpu(raw_inode->i_size_lo); |
2781 | } |
2782 | |
2783 | static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size) |
2784 | { |
2785 | raw_inode->i_size_lo = cpu_to_le32(i_size); |
2786 | raw_inode->i_size_high = cpu_to_le32(i_size >> 32); |
2787 | } |
2788 | |
2789 | static inline |
2790 | struct ext4_group_info *ext4_get_group_info(struct super_block *sb, |
2791 | ext4_group_t group) |
2792 | { |
2793 | struct ext4_group_info ***grp_info; |
2794 | long indexv, indexh; |
2795 | BUG_ON(group >= EXT4_SB(sb)->s_groups_count); |
2796 | grp_info = EXT4_SB(sb)->s_group_info; |
2797 | indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb)); |
2798 | indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1); |
2799 | return grp_info[indexv][indexh]; |
2800 | } |
2801 | |
2802 | /* |
2803 | * Reading s_groups_count requires using smp_rmb() afterwards. See |
2804 | * the locking protocol documented in the comments of ext4_group_add() |
2805 | * in resize.c |
2806 | */ |
2807 | static inline ext4_group_t ext4_get_groups_count(struct super_block *sb) |
2808 | { |
2809 | ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count; |
2810 | |
2811 | smp_rmb(); |
2812 | return ngroups; |
2813 | } |
2814 | |
2815 | static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi, |
2816 | ext4_group_t block_group) |
2817 | { |
2818 | return block_group >> sbi->s_log_groups_per_flex; |
2819 | } |
2820 | |
2821 | static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi) |
2822 | { |
2823 | return 1 << sbi->s_log_groups_per_flex; |
2824 | } |
2825 | |
2826 | #define ext4_std_error(sb, errno) \ |
2827 | do { \ |
2828 | if ((errno)) \ |
2829 | __ext4_std_error((sb), __func__, __LINE__, (errno)); \ |
2830 | } while (0) |
2831 | |
2832 | #ifdef CONFIG_SMP |
2833 | /* Each CPU can accumulate percpu_counter_batch clusters in their local |
2834 | * counters. So we need to make sure we have free clusters more |
2835 | * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times. |
2836 | */ |
2837 | #define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids)) |
2838 | #else |
2839 | #define EXT4_FREECLUSTERS_WATERMARK 0 |
2840 | #endif |
2841 | |
2842 | /* Update i_disksize. Requires i_mutex to avoid races with truncate */ |
2843 | static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize) |
2844 | { |
2845 | WARN_ON_ONCE(S_ISREG(inode->i_mode) && |
2846 | !inode_is_locked(inode)); |
2847 | down_write(&EXT4_I(inode)->i_data_sem); |
2848 | if (newsize > EXT4_I(inode)->i_disksize) |
2849 | EXT4_I(inode)->i_disksize = newsize; |
2850 | up_write(&EXT4_I(inode)->i_data_sem); |
2851 | } |
2852 | |
2853 | /* Update i_size, i_disksize. Requires i_mutex to avoid races with truncate */ |
2854 | static inline int ext4_update_inode_size(struct inode *inode, loff_t newsize) |
2855 | { |
2856 | int changed = 0; |
2857 | |
2858 | if (newsize > inode->i_size) { |
2859 | i_size_write(inode, newsize); |
2860 | changed = 1; |
2861 | } |
2862 | if (newsize > EXT4_I(inode)->i_disksize) { |
2863 | ext4_update_i_disksize(inode, newsize); |
2864 | changed |= 2; |
2865 | } |
2866 | return changed; |
2867 | } |
2868 | |
2869 | int ext4_update_disksize_before_punch(struct inode *inode, loff_t offset, |
2870 | loff_t len); |
2871 | |
2872 | struct ext4_group_info { |
2873 | unsigned long bb_state; |
2874 | struct rb_root bb_free_root; |
2875 | ext4_grpblk_t bb_first_free; /* first free block */ |
2876 | ext4_grpblk_t bb_free; /* total free blocks */ |
2877 | ext4_grpblk_t bb_fragments; /* nr of freespace fragments */ |
2878 | ext4_grpblk_t bb_largest_free_order;/* order of largest frag in BG */ |
2879 | struct list_head bb_prealloc_list; |
2880 | #ifdef DOUBLE_CHECK |
2881 | void *bb_bitmap; |
2882 | #endif |
2883 | struct rw_semaphore alloc_sem; |
2884 | ext4_grpblk_t bb_counters[]; /* Nr of free power-of-two-block |
2885 | * regions, index is order. |
2886 | * bb_counters[3] = 5 means |
2887 | * 5 free 8-block regions. */ |
2888 | }; |
2889 | |
2890 | #define EXT4_GROUP_INFO_NEED_INIT_BIT 0 |
2891 | #define EXT4_GROUP_INFO_WAS_TRIMMED_BIT 1 |
2892 | #define EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT 2 |
2893 | #define EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT 3 |
2894 | #define EXT4_GROUP_INFO_BBITMAP_CORRUPT \ |
2895 | (1 << EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT) |
2896 | #define EXT4_GROUP_INFO_IBITMAP_CORRUPT \ |
2897 | (1 << EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT) |
2898 | |
2899 | #define EXT4_MB_GRP_NEED_INIT(grp) \ |
2900 | (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state))) |
2901 | #define EXT4_MB_GRP_BBITMAP_CORRUPT(grp) \ |
2902 | (test_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &((grp)->bb_state))) |
2903 | #define EXT4_MB_GRP_IBITMAP_CORRUPT(grp) \ |
2904 | (test_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &((grp)->bb_state))) |
2905 | |
2906 | #define EXT4_MB_GRP_WAS_TRIMMED(grp) \ |
2907 | (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) |
2908 | #define EXT4_MB_GRP_SET_TRIMMED(grp) \ |
2909 | (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) |
2910 | #define EXT4_MB_GRP_CLEAR_TRIMMED(grp) \ |
2911 | (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) |
2912 | |
2913 | #define EXT4_MAX_CONTENTION 8 |
2914 | #define EXT4_CONTENTION_THRESHOLD 2 |
2915 | |
2916 | static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb, |
2917 | ext4_group_t group) |
2918 | { |
2919 | return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group); |
2920 | } |
2921 | |
2922 | /* |
2923 | * Returns true if the filesystem is busy enough that attempts to |
2924 | * access the block group locks has run into contention. |
2925 | */ |
2926 | static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi) |
2927 | { |
2928 | return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD); |
2929 | } |
2930 | |
2931 | static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group) |
2932 | { |
2933 | spinlock_t *lock = ext4_group_lock_ptr(sb, group); |
2934 | if (spin_trylock(lock)) |
2935 | /* |
2936 | * We're able to grab the lock right away, so drop the |
2937 | * lock contention counter. |
2938 | */ |
2939 | atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0); |
2940 | else { |
2941 | /* |
2942 | * The lock is busy, so bump the contention counter, |
2943 | * and then wait on the spin lock. |
2944 | */ |
2945 | atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1, |
2946 | EXT4_MAX_CONTENTION); |
2947 | spin_lock(lock); |
2948 | } |
2949 | } |
2950 | |
2951 | static inline void ext4_unlock_group(struct super_block *sb, |
2952 | ext4_group_t group) |
2953 | { |
2954 | spin_unlock(ext4_group_lock_ptr(sb, group)); |
2955 | } |
2956 | |
2957 | /* |
2958 | * Block validity checking |
2959 | */ |
2960 | #define ext4_check_indirect_blockref(inode, bh) \ |
2961 | ext4_check_blockref(__func__, __LINE__, inode, \ |
2962 | (__le32 *)(bh)->b_data, \ |
2963 | EXT4_ADDR_PER_BLOCK((inode)->i_sb)) |
2964 | |
2965 | #define ext4_ind_check_inode(inode) \ |
2966 | ext4_check_blockref(__func__, __LINE__, inode, \ |
2967 | EXT4_I(inode)->i_data, \ |
2968 | EXT4_NDIR_BLOCKS) |
2969 | |
2970 | /* |
2971 | * Inodes and files operations |
2972 | */ |
2973 | |
2974 | /* dir.c */ |
2975 | extern const struct file_operations ext4_dir_operations; |
2976 | |
2977 | /* file.c */ |
2978 | extern const struct inode_operations ext4_file_inode_operations; |
2979 | extern const struct file_operations ext4_file_operations; |
2980 | extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin); |
2981 | |
2982 | /* inline.c */ |
2983 | extern int ext4_get_max_inline_size(struct inode *inode); |
2984 | extern int ext4_find_inline_data_nolock(struct inode *inode); |
2985 | extern int ext4_init_inline_data(handle_t *handle, struct inode *inode, |
2986 | unsigned int len); |
2987 | extern int ext4_destroy_inline_data(handle_t *handle, struct inode *inode); |
2988 | |
2989 | extern int ext4_readpage_inline(struct inode *inode, struct page *page); |
2990 | extern int ext4_try_to_write_inline_data(struct address_space *mapping, |
2991 | struct inode *inode, |
2992 | loff_t pos, unsigned len, |
2993 | unsigned flags, |
2994 | struct page **pagep); |
2995 | extern int ext4_write_inline_data_end(struct inode *inode, |
2996 | loff_t pos, unsigned len, |
2997 | unsigned copied, |
2998 | struct page *page); |
2999 | extern struct buffer_head * |
3000 | ext4_journalled_write_inline_data(struct inode *inode, |
3001 | unsigned len, |
3002 | struct page *page); |
3003 | extern int ext4_da_write_inline_data_begin(struct address_space *mapping, |
3004 | struct inode *inode, |
3005 | loff_t pos, unsigned len, |
3006 | unsigned flags, |
3007 | struct page **pagep, |
3008 | void **fsdata); |
3009 | extern int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos, |
3010 | unsigned len, unsigned copied, |
3011 | struct page *page); |
3012 | extern int ext4_try_add_inline_entry(handle_t *handle, |
3013 | struct ext4_filename *fname, |
3014 | struct inode *dir, struct inode *inode); |
3015 | extern int ext4_try_create_inline_dir(handle_t *handle, |
3016 | struct inode *parent, |
3017 | struct inode *inode); |
3018 | extern int ext4_read_inline_dir(struct file *filp, |
3019 | struct dir_context *ctx, |
3020 | int *has_inline_data); |
3021 | extern int htree_inlinedir_to_tree(struct file *dir_file, |
3022 | struct inode *dir, ext4_lblk_t block, |
3023 | struct dx_hash_info *hinfo, |
3024 | __u32 start_hash, __u32 start_minor_hash, |
3025 | int *has_inline_data); |
3026 | extern struct buffer_head *ext4_find_inline_entry(struct inode *dir, |
3027 | struct ext4_filename *fname, |
3028 | struct ext4_dir_entry_2 **res_dir, |
3029 | int *has_inline_data); |
3030 | extern int ext4_delete_inline_entry(handle_t *handle, |
3031 | struct inode *dir, |
3032 | struct ext4_dir_entry_2 *de_del, |
3033 | struct buffer_head *bh, |
3034 | int *has_inline_data); |
3035 | extern bool empty_inline_dir(struct inode *dir, int *has_inline_data); |
3036 | extern struct buffer_head *ext4_get_first_inline_block(struct inode *inode, |
3037 | struct ext4_dir_entry_2 **parent_de, |
3038 | int *retval); |
3039 | extern int ext4_inline_data_fiemap(struct inode *inode, |
3040 | struct fiemap_extent_info *fieinfo, |
3041 | int *has_inline, __u64 start, __u64 len); |
3042 | |
3043 | struct iomap; |
3044 | extern int ext4_inline_data_iomap(struct inode *inode, struct iomap *iomap); |
3045 | |
3046 | extern int ext4_inline_data_truncate(struct inode *inode, int *has_inline); |
3047 | |
3048 | extern int ext4_convert_inline_data(struct inode *inode); |
3049 | |
3050 | static inline int ext4_has_inline_data(struct inode *inode) |
3051 | { |
3052 | return ext4_test_inode_flag(inode, EXT4_INODE_INLINE_DATA) && |
3053 | EXT4_I(inode)->i_inline_off; |
3054 | } |
3055 | |
3056 | /* namei.c */ |
3057 | extern const struct inode_operations ext4_dir_inode_operations; |
3058 | extern const struct inode_operations ext4_special_inode_operations; |
3059 | extern struct dentry *ext4_get_parent(struct dentry *child); |
3060 | extern struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode, |
3061 | struct ext4_dir_entry_2 *de, |
3062 | int blocksize, int csum_size, |
3063 | unsigned int parent_ino, int dotdot_real_len); |
3064 | extern void initialize_dirent_tail(struct ext4_dir_entry_tail *t, |
3065 | unsigned int blocksize); |
3066 | extern int ext4_handle_dirty_dirent_node(handle_t *handle, |
3067 | struct inode *inode, |
3068 | struct buffer_head *bh); |
3069 | #define S_SHIFT 12 |
3070 | static const unsigned char ext4_type_by_mode[(S_IFMT >> S_SHIFT) + 1] = { |
3071 | [S_IFREG >> S_SHIFT] = EXT4_FT_REG_FILE, |
3072 | [S_IFDIR >> S_SHIFT] = EXT4_FT_DIR, |
3073 | [S_IFCHR >> S_SHIFT] = EXT4_FT_CHRDEV, |
3074 | [S_IFBLK >> S_SHIFT] = EXT4_FT_BLKDEV, |
3075 | [S_IFIFO >> S_SHIFT] = EXT4_FT_FIFO, |
3076 | [S_IFSOCK >> S_SHIFT] = EXT4_FT_SOCK, |
3077 | [S_IFLNK >> S_SHIFT] = EXT4_FT_SYMLINK, |
3078 | }; |
3079 | |
3080 | static inline void ext4_set_de_type(struct super_block *sb, |
3081 | struct ext4_dir_entry_2 *de, |
3082 | umode_t mode) { |
3083 | if (ext4_has_feature_filetype(sb)) |
3084 | de->file_type = ext4_type_by_mode[(mode & S_IFMT)>>S_SHIFT]; |
3085 | } |
3086 | |
3087 | /* readpages.c */ |
3088 | extern int ext4_mpage_readpages(struct address_space *mapping, |
3089 | struct list_head *pages, struct page *page, |
3090 | unsigned nr_pages, bool is_readahead); |
3091 | |
3092 | /* symlink.c */ |
3093 | extern const struct inode_operations ext4_encrypted_symlink_inode_operations; |
3094 | extern const struct inode_operations ext4_symlink_inode_operations; |
3095 | extern const struct inode_operations ext4_fast_symlink_inode_operations; |
3096 | |
3097 | /* sysfs.c */ |
3098 | extern int ext4_register_sysfs(struct super_block *sb); |
3099 | extern void ext4_unregister_sysfs(struct super_block *sb); |
3100 | extern int __init ext4_init_sysfs(void); |
3101 | extern void ext4_exit_sysfs(void); |
3102 | |
3103 | /* block_validity */ |
3104 | extern void ext4_release_system_zone(struct super_block *sb); |
3105 | extern int ext4_setup_system_zone(struct super_block *sb); |
3106 | extern int __init ext4_init_system_zone(void); |
3107 | extern void ext4_exit_system_zone(void); |
3108 | extern int ext4_data_block_valid(struct ext4_sb_info *sbi, |
3109 | ext4_fsblk_t start_blk, |
3110 | unsigned int count); |
3111 | extern int ext4_check_blockref(const char *, unsigned int, |
3112 | struct inode *, __le32 *, unsigned int); |
3113 | |
3114 | /* extents.c */ |
3115 | struct ext4_ext_path; |
3116 | struct ext4_extent; |
3117 | |
3118 | /* |
3119 | * Maximum number of logical blocks in a file; ext4_extent's ee_block is |
3120 | * __le32. |
3121 | */ |
3122 | #define EXT_MAX_BLOCKS 0xffffffff |
3123 | |
3124 | extern int ext4_ext_tree_init(handle_t *handle, struct inode *); |
3125 | extern int ext4_ext_writepage_trans_blocks(struct inode *, int); |
3126 | extern int ext4_ext_index_trans_blocks(struct inode *inode, int extents); |
3127 | extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode, |
3128 | struct ext4_map_blocks *map, int flags); |
3129 | extern int ext4_ext_truncate(handle_t *, struct inode *); |
3130 | extern int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start, |
3131 | ext4_lblk_t end); |
3132 | extern void ext4_ext_init(struct super_block *); |
3133 | extern void ext4_ext_release(struct super_block *); |
3134 | extern long ext4_fallocate(struct file *file, int mode, loff_t offset, |
3135 | loff_t len); |
3136 | extern int ext4_convert_unwritten_extents(handle_t *handle, struct inode *inode, |
3137 | loff_t offset, ssize_t len); |
3138 | extern int ext4_map_blocks(handle_t *handle, struct inode *inode, |
3139 | struct ext4_map_blocks *map, int flags); |
3140 | extern int ext4_ext_calc_metadata_amount(struct inode *inode, |
3141 | ext4_lblk_t lblocks); |
3142 | extern int ext4_ext_calc_credits_for_single_extent(struct inode *inode, |
3143 | int num, |
3144 | struct ext4_ext_path *path); |
3145 | extern int ext4_can_extents_be_merged(struct inode *inode, |
3146 | struct ext4_extent *ex1, |
3147 | struct ext4_extent *ex2); |
3148 | extern int ext4_ext_insert_extent(handle_t *, struct inode *, |
3149 | struct ext4_ext_path **, |
3150 | struct ext4_extent *, int); |
3151 | extern struct ext4_ext_path *ext4_find_extent(struct inode *, ext4_lblk_t, |
3152 | struct ext4_ext_path **, |
3153 | int flags); |
3154 | extern void ext4_ext_drop_refs(struct ext4_ext_path *); |
3155 | extern int ext4_ext_check_inode(struct inode *inode); |
3156 | extern ext4_lblk_t ext4_ext_next_allocated_block(struct ext4_ext_path *path); |
3157 | extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, |
3158 | __u64 start, __u64 len); |
3159 | extern int ext4_ext_precache(struct inode *inode); |
3160 | extern int ext4_collapse_range(struct inode *inode, loff_t offset, loff_t len); |
3161 | extern int ext4_insert_range(struct inode *inode, loff_t offset, loff_t len); |
3162 | extern int ext4_swap_extents(handle_t *handle, struct inode *inode1, |
3163 | struct inode *inode2, ext4_lblk_t lblk1, |
3164 | ext4_lblk_t lblk2, ext4_lblk_t count, |
3165 | int mark_unwritten,int *err); |
3166 | extern int ext4_clu_mapped(struct inode *inode, ext4_lblk_t lclu); |
3167 | |
3168 | /* move_extent.c */ |
3169 | extern void ext4_double_down_write_data_sem(struct inode *first, |
3170 | struct inode *second); |
3171 | extern void ext4_double_up_write_data_sem(struct inode *orig_inode, |
3172 | struct inode *donor_inode); |
3173 | extern int ext4_move_extents(struct file *o_filp, struct file *d_filp, |
3174 | __u64 start_orig, __u64 start_donor, |
3175 | __u64 len, __u64 *moved_len); |
3176 | |
3177 | /* page-io.c */ |
3178 | extern int __init ext4_init_pageio(void); |
3179 | extern void ext4_exit_pageio(void); |
3180 | extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags); |
3181 | extern ext4_io_end_t *ext4_get_io_end(ext4_io_end_t *io_end); |
3182 | extern int ext4_put_io_end(ext4_io_end_t *io_end); |
3183 | extern void ext4_put_io_end_defer(ext4_io_end_t *io_end); |
3184 | extern void ext4_io_submit_init(struct ext4_io_submit *io, |
3185 | struct writeback_control *wbc); |
3186 | extern void ext4_end_io_rsv_work(struct work_struct *work); |
3187 | extern void ext4_io_submit(struct ext4_io_submit *io); |
3188 | extern int ext4_bio_write_page(struct ext4_io_submit *io, |
3189 | struct page *page, |
3190 | int len, |
3191 | struct writeback_control *wbc, |
3192 | bool keep_towrite); |
3193 | |
3194 | /* mmp.c */ |
3195 | extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t); |
3196 | |
3197 | /* |
3198 | * Add new method to test whether block and inode bitmaps are properly |
3199 | * initialized. With uninit_bg reading the block from disk is not enough |
3200 | * to mark the bitmap uptodate. We need to also zero-out the bitmap |
3201 | */ |
3202 | #define BH_BITMAP_UPTODATE BH_JBDPrivateStart |
3203 | |
3204 | static inline int bitmap_uptodate(struct buffer_head *bh) |
3205 | { |
3206 | return (buffer_uptodate(bh) && |
3207 | test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state)); |
3208 | } |
3209 | static inline void set_bitmap_uptodate(struct buffer_head *bh) |
3210 | { |
3211 | set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state); |
3212 | } |
3213 | |
3214 | #define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1) |
3215 | |
3216 | /* For ioend & aio unwritten conversion wait queues */ |
3217 | #define EXT4_WQ_HASH_SZ 37 |
3218 | #define ext4_ioend_wq(v) (&ext4__ioend_wq[((unsigned long)(v)) %\ |
3219 | EXT4_WQ_HASH_SZ]) |
3220 | extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ]; |
3221 | |
3222 | extern int ext4_resize_begin(struct super_block *sb); |
3223 | extern void ext4_resize_end(struct super_block *sb); |
3224 | |
3225 | static inline void ext4_set_io_unwritten_flag(struct inode *inode, |
3226 | struct ext4_io_end *io_end) |
3227 | { |
3228 | if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) { |
3229 | io_end->flag |= EXT4_IO_END_UNWRITTEN; |
3230 | atomic_inc(&EXT4_I(inode)->i_unwritten); |
3231 | } |
3232 | } |
3233 | |
3234 | static inline void ext4_clear_io_unwritten_flag(ext4_io_end_t *io_end) |
3235 | { |
3236 | struct inode *inode = io_end->inode; |
3237 | |
3238 | if (io_end->flag & EXT4_IO_END_UNWRITTEN) { |
3239 | io_end->flag &= ~EXT4_IO_END_UNWRITTEN; |
3240 | /* Wake up anyone waiting on unwritten extent conversion */ |
3241 | if (atomic_dec_and_test(&EXT4_I(inode)->i_unwritten)) |
3242 | wake_up_all(ext4_ioend_wq(inode)); |
3243 | } |
3244 | } |
3245 | |
3246 | extern const struct iomap_ops ext4_iomap_ops; |
3247 | |
3248 | #endif /* __KERNEL__ */ |
3249 | |
3250 | #define EFSBADCRC EBADMSG /* Bad CRC detected */ |
3251 | #define EFSCORRUPTED EUCLEAN /* Filesystem is corrupted */ |
3252 | |
3253 | #endif /* _EXT4_H */ |
3254 | |