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1 | /* | |
2 | * ext4.h | |
3 | * | |
4 | * Copyright (C) 1992, 1993, 1994, 1995 | |
5 | * Remy Card (card@masi.ibp.fr) | |
6 | * Laboratoire MASI - Institut Blaise Pascal | |
7 | * Universite Pierre et Marie Curie (Paris VI) | |
8 | * | |
9 | * from | |
10 | * | |
11 | * linux/include/linux/minix_fs.h | |
12 | * | |
13 | * Copyright (C) 1991, 1992 Linus Torvalds | |
14 | */ | |
15 | ||
16 | #ifndef _EXT4_H | |
17 | #define _EXT4_H | |
18 | ||
19 | #include <linux/types.h> | |
20 | #include <linux/blkdev.h> | |
21 | #include <linux/magic.h> | |
22 | #include <linux/jbd2.h> | |
23 | #include <linux/quota.h> | |
24 | #include <linux/rwsem.h> | |
25 | #include <linux/rbtree.h> | |
26 | #include <linux/seqlock.h> | |
27 | #include <linux/mutex.h> | |
28 | #include <linux/timer.h> | |
29 | #include <linux/wait.h> | |
30 | #include <linux/blockgroup_lock.h> | |
31 | #include <linux/percpu_counter.h> | |
32 | #include <crypto/hash.h> | |
33 | #ifdef __KERNEL__ | |
34 | #include <linux/compat.h> | |
35 | #endif | |
36 | ||
37 | /* | |
38 | * The fourth extended filesystem constants/structures | |
39 | */ | |
40 | ||
41 | /* | |
42 | * Define EXT4FS_DEBUG to produce debug messages | |
43 | */ | |
44 | #undef EXT4FS_DEBUG | |
45 | ||
46 | /* | |
47 | * Debug code | |
48 | */ | |
49 | #ifdef EXT4FS_DEBUG | |
50 | #define ext4_debug(f, a...) \ | |
51 | do { \ | |
52 | printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \ | |
53 | __FILE__, __LINE__, __func__); \ | |
54 | printk(KERN_DEBUG f, ## a); \ | |
55 | } while (0) | |
56 | #else | |
57 | #define ext4_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__) | |
58 | #endif | |
59 | ||
60 | /* | |
61 | * Turn on EXT_DEBUG to get lots of info about extents operations. | |
62 | */ | |
63 | #define EXT_DEBUG__ | |
64 | #ifdef EXT_DEBUG | |
65 | #define ext_debug(fmt, ...) printk(fmt, ##__VA_ARGS__) | |
66 | #else | |
67 | #define ext_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__) | |
68 | #endif | |
69 | ||
70 | #define EXT4_ERROR_INODE(inode, fmt, a...) \ | |
71 | ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a) | |
72 | ||
73 | #define EXT4_ERROR_INODE_BLOCK(inode, block, fmt, a...) \ | |
74 | ext4_error_inode((inode), __func__, __LINE__, (block), (fmt), ## a) | |
75 | ||
76 | #define EXT4_ERROR_FILE(file, block, fmt, a...) \ | |
77 | ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a) | |
78 | ||
79 | /* data type for block offset of block group */ | |
80 | typedef int ext4_grpblk_t; | |
81 | ||
82 | /* data type for filesystem-wide blocks number */ | |
83 | typedef unsigned long long ext4_fsblk_t; | |
84 | ||
85 | /* data type for file logical block number */ | |
86 | typedef __u32 ext4_lblk_t; | |
87 | ||
88 | /* data type for block group number */ | |
89 | typedef unsigned int ext4_group_t; | |
90 | ||
91 | /* | |
92 | * Flags used in mballoc's allocation_context flags field. | |
93 | * | |
94 | * Also used to show what's going on for debugging purposes when the | |
95 | * flag field is exported via the traceport interface | |
96 | */ | |
97 | ||
98 | /* prefer goal again. length */ | |
99 | #define EXT4_MB_HINT_MERGE 0x0001 | |
100 | /* blocks already reserved */ | |
101 | #define EXT4_MB_HINT_RESERVED 0x0002 | |
102 | /* metadata is being allocated */ | |
103 | #define EXT4_MB_HINT_METADATA 0x0004 | |
104 | /* first blocks in the file */ | |
105 | #define EXT4_MB_HINT_FIRST 0x0008 | |
106 | /* search for the best chunk */ | |
107 | #define EXT4_MB_HINT_BEST 0x0010 | |
108 | /* data is being allocated */ | |
109 | #define EXT4_MB_HINT_DATA 0x0020 | |
110 | /* don't preallocate (for tails) */ | |
111 | #define EXT4_MB_HINT_NOPREALLOC 0x0040 | |
112 | /* allocate for locality group */ | |
113 | #define EXT4_MB_HINT_GROUP_ALLOC 0x0080 | |
114 | /* allocate goal blocks or none */ | |
115 | #define EXT4_MB_HINT_GOAL_ONLY 0x0100 | |
116 | /* goal is meaningful */ | |
117 | #define EXT4_MB_HINT_TRY_GOAL 0x0200 | |
118 | /* blocks already pre-reserved by delayed allocation */ | |
119 | #define EXT4_MB_DELALLOC_RESERVED 0x0400 | |
120 | /* We are doing stream allocation */ | |
121 | #define EXT4_MB_STREAM_ALLOC 0x0800 | |
122 | /* Use reserved root blocks if needed */ | |
123 | #define EXT4_MB_USE_ROOT_BLOCKS 0x1000 | |
124 | ||
125 | struct ext4_allocation_request { | |
126 | /* target inode for block we're allocating */ | |
127 | struct inode *inode; | |
128 | /* how many blocks we want to allocate */ | |
129 | unsigned int len; | |
130 | /* logical block in target inode */ | |
131 | ext4_lblk_t logical; | |
132 | /* the closest logical allocated block to the left */ | |
133 | ext4_lblk_t lleft; | |
134 | /* the closest logical allocated block to the right */ | |
135 | ext4_lblk_t lright; | |
136 | /* phys. target (a hint) */ | |
137 | ext4_fsblk_t goal; | |
138 | /* phys. block for the closest logical allocated block to the left */ | |
139 | ext4_fsblk_t pleft; | |
140 | /* phys. block for the closest logical allocated block to the right */ | |
141 | ext4_fsblk_t pright; | |
142 | /* flags. see above EXT4_MB_HINT_* */ | |
143 | unsigned int flags; | |
144 | }; | |
145 | ||
146 | /* | |
147 | * Logical to physical block mapping, used by ext4_map_blocks() | |
148 | * | |
149 | * This structure is used to pass requests into ext4_map_blocks() as | |
150 | * well as to store the information returned by ext4_map_blocks(). It | |
151 | * takes less room on the stack than a struct buffer_head. | |
152 | */ | |
153 | #define EXT4_MAP_NEW (1 << BH_New) | |
154 | #define EXT4_MAP_MAPPED (1 << BH_Mapped) | |
155 | #define EXT4_MAP_UNWRITTEN (1 << BH_Unwritten) | |
156 | #define EXT4_MAP_BOUNDARY (1 << BH_Boundary) | |
157 | #define EXT4_MAP_UNINIT (1 << BH_Uninit) | |
158 | /* Sometimes (in the bigalloc case, from ext4_da_get_block_prep) the caller of | |
159 | * ext4_map_blocks wants to know whether or not the underlying cluster has | |
160 | * already been accounted for. EXT4_MAP_FROM_CLUSTER conveys to the caller that | |
161 | * the requested mapping was from previously mapped (or delayed allocated) | |
162 | * cluster. We use BH_AllocFromCluster only for this flag. BH_AllocFromCluster | |
163 | * should never appear on buffer_head's state flags. | |
164 | */ | |
165 | #define EXT4_MAP_FROM_CLUSTER (1 << BH_AllocFromCluster) | |
166 | #define EXT4_MAP_FLAGS (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\ | |
167 | EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY |\ | |
168 | EXT4_MAP_UNINIT | EXT4_MAP_FROM_CLUSTER) | |
169 | ||
170 | struct ext4_map_blocks { | |
171 | ext4_fsblk_t m_pblk; | |
172 | ext4_lblk_t m_lblk; | |
173 | unsigned int m_len; | |
174 | unsigned int m_flags; | |
175 | }; | |
176 | ||
177 | /* | |
178 | * For delayed allocation tracking | |
179 | */ | |
180 | struct mpage_da_data { | |
181 | struct inode *inode; | |
182 | sector_t b_blocknr; /* start block number of extent */ | |
183 | size_t b_size; /* size of extent */ | |
184 | unsigned long b_state; /* state of the extent */ | |
185 | unsigned long first_page, next_page; /* extent of pages */ | |
186 | struct writeback_control *wbc; | |
187 | int io_done; | |
188 | int pages_written; | |
189 | int retval; | |
190 | }; | |
191 | ||
192 | /* | |
193 | * Flags for ext4_io_end->flags | |
194 | */ | |
195 | #define EXT4_IO_END_UNWRITTEN 0x0001 | |
196 | #define EXT4_IO_END_ERROR 0x0002 | |
197 | #define EXT4_IO_END_QUEUED 0x0004 | |
198 | #define EXT4_IO_END_DIRECT 0x0008 | |
199 | ||
200 | struct ext4_io_page { | |
201 | struct page *p_page; | |
202 | atomic_t p_count; | |
203 | }; | |
204 | ||
205 | #define MAX_IO_PAGES 128 | |
206 | ||
207 | /* | |
208 | * For converting uninitialized extents on a work queue. | |
209 | * | |
210 | * 'page' is only used from the writepage() path; 'pages' is only used for | |
211 | * buffered writes; they are used to keep page references until conversion | |
212 | * takes place. For AIO/DIO, neither field is filled in. | |
213 | */ | |
214 | typedef struct ext4_io_end { | |
215 | struct list_head list; /* per-file finished IO list */ | |
216 | struct inode *inode; /* file being written to */ | |
217 | unsigned int flag; /* unwritten or not */ | |
218 | struct page *page; /* for writepage() path */ | |
219 | loff_t offset; /* offset in the file */ | |
220 | ssize_t size; /* size of the extent */ | |
221 | struct work_struct work; /* data work queue */ | |
222 | struct kiocb *iocb; /* iocb struct for AIO */ | |
223 | int result; /* error value for AIO */ | |
224 | int num_io_pages; /* for writepages() */ | |
225 | struct ext4_io_page *pages[MAX_IO_PAGES]; /* for writepages() */ | |
226 | } ext4_io_end_t; | |
227 | ||
228 | struct ext4_io_submit { | |
229 | int io_op; | |
230 | struct bio *io_bio; | |
231 | ext4_io_end_t *io_end; | |
232 | struct ext4_io_page *io_page; | |
233 | sector_t io_next_block; | |
234 | }; | |
235 | ||
236 | /* | |
237 | * Special inodes numbers | |
238 | */ | |
239 | #define EXT4_BAD_INO 1 /* Bad blocks inode */ | |
240 | #define EXT4_ROOT_INO 2 /* Root inode */ | |
241 | #define EXT4_USR_QUOTA_INO 3 /* User quota inode */ | |
242 | #define EXT4_GRP_QUOTA_INO 4 /* Group quota inode */ | |
243 | #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */ | |
244 | #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */ | |
245 | #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */ | |
246 | #define EXT4_JOURNAL_INO 8 /* Journal inode */ | |
247 | ||
248 | /* First non-reserved inode for old ext4 filesystems */ | |
249 | #define EXT4_GOOD_OLD_FIRST_INO 11 | |
250 | ||
251 | /* | |
252 | * Maximal count of links to a file | |
253 | */ | |
254 | #define EXT4_LINK_MAX 65000 | |
255 | ||
256 | /* | |
257 | * Macro-instructions used to manage several block sizes | |
258 | */ | |
259 | #define EXT4_MIN_BLOCK_SIZE 1024 | |
260 | #define EXT4_MAX_BLOCK_SIZE 65536 | |
261 | #define EXT4_MIN_BLOCK_LOG_SIZE 10 | |
262 | #define EXT4_MAX_BLOCK_LOG_SIZE 16 | |
263 | #ifdef __KERNEL__ | |
264 | # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize) | |
265 | #else | |
266 | # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size) | |
267 | #endif | |
268 | #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32)) | |
269 | #define EXT4_CLUSTER_SIZE(s) (EXT4_BLOCK_SIZE(s) << \ | |
270 | EXT4_SB(s)->s_cluster_bits) | |
271 | #ifdef __KERNEL__ | |
272 | # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits) | |
273 | # define EXT4_CLUSTER_BITS(s) (EXT4_SB(s)->s_cluster_bits) | |
274 | #else | |
275 | # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10) | |
276 | #endif | |
277 | #ifdef __KERNEL__ | |
278 | #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits) | |
279 | #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size) | |
280 | #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino) | |
281 | #else | |
282 | #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ | |
283 | EXT4_GOOD_OLD_INODE_SIZE : \ | |
284 | (s)->s_inode_size) | |
285 | #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ | |
286 | EXT4_GOOD_OLD_FIRST_INO : \ | |
287 | (s)->s_first_ino) | |
288 | #endif | |
289 | #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits))) | |
290 | ||
291 | /* Translate a block number to a cluster number */ | |
292 | #define EXT4_B2C(sbi, blk) ((blk) >> (sbi)->s_cluster_bits) | |
293 | /* Translate a cluster number to a block number */ | |
294 | #define EXT4_C2B(sbi, cluster) ((cluster) << (sbi)->s_cluster_bits) | |
295 | /* Translate # of blks to # of clusters */ | |
296 | #define EXT4_NUM_B2C(sbi, blks) (((blks) + (sbi)->s_cluster_ratio - 1) >> \ | |
297 | (sbi)->s_cluster_bits) | |
298 | ||
299 | /* | |
300 | * Structure of a blocks group descriptor | |
301 | */ | |
302 | struct ext4_group_desc | |
303 | { | |
304 | __le32 bg_block_bitmap_lo; /* Blocks bitmap block */ | |
305 | __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */ | |
306 | __le32 bg_inode_table_lo; /* Inodes table block */ | |
307 | __le16 bg_free_blocks_count_lo;/* Free blocks count */ | |
308 | __le16 bg_free_inodes_count_lo;/* Free inodes count */ | |
309 | __le16 bg_used_dirs_count_lo; /* Directories count */ | |
310 | __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */ | |
311 | __le32 bg_exclude_bitmap_lo; /* Exclude bitmap for snapshots */ | |
312 | __le16 bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bbitmap) LE */ | |
313 | __le16 bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+ibitmap) LE */ | |
314 | __le16 bg_itable_unused_lo; /* Unused inodes count */ | |
315 | __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */ | |
316 | __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */ | |
317 | __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */ | |
318 | __le32 bg_inode_table_hi; /* Inodes table block MSB */ | |
319 | __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */ | |
320 | __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */ | |
321 | __le16 bg_used_dirs_count_hi; /* Directories count MSB */ | |
322 | __le16 bg_itable_unused_hi; /* Unused inodes count MSB */ | |
323 | __le32 bg_exclude_bitmap_hi; /* Exclude bitmap block MSB */ | |
324 | __le16 bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bbitmap) BE */ | |
325 | __le16 bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+ibitmap) BE */ | |
326 | __u32 bg_reserved; | |
327 | }; | |
328 | ||
329 | #define EXT4_BG_INODE_BITMAP_CSUM_HI_END \ | |
330 | (offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \ | |
331 | sizeof(__le16)) | |
332 | #define EXT4_BG_BLOCK_BITMAP_CSUM_HI_END \ | |
333 | (offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \ | |
334 | sizeof(__le16)) | |
335 | ||
336 | /* | |
337 | * Structure of a flex block group info | |
338 | */ | |
339 | ||
340 | struct flex_groups { | |
341 | atomic_t free_inodes; | |
342 | atomic_t free_clusters; | |
343 | atomic_t used_dirs; | |
344 | }; | |
345 | ||
346 | #define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */ | |
347 | #define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */ | |
348 | #define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */ | |
349 | ||
350 | /* | |
351 | * Macro-instructions used to manage group descriptors | |
352 | */ | |
353 | #define EXT4_MIN_DESC_SIZE 32 | |
354 | #define EXT4_MIN_DESC_SIZE_64BIT 64 | |
355 | #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE | |
356 | #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size) | |
357 | #ifdef __KERNEL__ | |
358 | # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group) | |
359 | # define EXT4_CLUSTERS_PER_GROUP(s) (EXT4_SB(s)->s_clusters_per_group) | |
360 | # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block) | |
361 | # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group) | |
362 | # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits) | |
363 | #else | |
364 | # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group) | |
365 | # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s)) | |
366 | # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group) | |
367 | #endif | |
368 | ||
369 | /* | |
370 | * Constants relative to the data blocks | |
371 | */ | |
372 | #define EXT4_NDIR_BLOCKS 12 | |
373 | #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS | |
374 | #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1) | |
375 | #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1) | |
376 | #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1) | |
377 | ||
378 | /* | |
379 | * Inode flags | |
380 | */ | |
381 | #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */ | |
382 | #define EXT4_UNRM_FL 0x00000002 /* Undelete */ | |
383 | #define EXT4_COMPR_FL 0x00000004 /* Compress file */ | |
384 | #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */ | |
385 | #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */ | |
386 | #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */ | |
387 | #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */ | |
388 | #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */ | |
389 | /* Reserved for compression usage... */ | |
390 | #define EXT4_DIRTY_FL 0x00000100 | |
391 | #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ | |
392 | #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */ | |
393 | #define EXT4_ECOMPR_FL 0x00000800 /* Compression error */ | |
394 | /* End compression flags --- maybe not all used */ | |
395 | #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */ | |
396 | #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */ | |
397 | #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */ | |
398 | #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */ | |
399 | #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */ | |
400 | #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/ | |
401 | #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */ | |
402 | #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */ | |
403 | #define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */ | |
404 | #define EXT4_EOFBLOCKS_FL 0x00400000 /* Blocks allocated beyond EOF */ | |
405 | #define EXT4_INLINE_DATA_FL 0x10000000 /* Inode has inline data. */ | |
406 | #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */ | |
407 | ||
408 | #define EXT4_FL_USER_VISIBLE 0x004BDFFF /* User visible flags */ | |
409 | #define EXT4_FL_USER_MODIFIABLE 0x004B80FF /* User modifiable flags */ | |
410 | ||
411 | /* Flags that should be inherited by new inodes from their parent. */ | |
412 | #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\ | |
413 | EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\ | |
414 | EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\ | |
415 | EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL) | |
416 | ||
417 | /* Flags that are appropriate for regular files (all but dir-specific ones). */ | |
418 | #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL)) | |
419 | ||
420 | /* Flags that are appropriate for non-directories/regular files. */ | |
421 | #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL) | |
422 | ||
423 | /* Mask out flags that are inappropriate for the given type of inode. */ | |
424 | static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags) | |
425 | { | |
426 | if (S_ISDIR(mode)) | |
427 | return flags; | |
428 | else if (S_ISREG(mode)) | |
429 | return flags & EXT4_REG_FLMASK; | |
430 | else | |
431 | return flags & EXT4_OTHER_FLMASK; | |
432 | } | |
433 | ||
434 | /* | |
435 | * Inode flags used for atomic set/get | |
436 | */ | |
437 | enum { | |
438 | EXT4_INODE_SECRM = 0, /* Secure deletion */ | |
439 | EXT4_INODE_UNRM = 1, /* Undelete */ | |
440 | EXT4_INODE_COMPR = 2, /* Compress file */ | |
441 | EXT4_INODE_SYNC = 3, /* Synchronous updates */ | |
442 | EXT4_INODE_IMMUTABLE = 4, /* Immutable file */ | |
443 | EXT4_INODE_APPEND = 5, /* writes to file may only append */ | |
444 | EXT4_INODE_NODUMP = 6, /* do not dump file */ | |
445 | EXT4_INODE_NOATIME = 7, /* do not update atime */ | |
446 | /* Reserved for compression usage... */ | |
447 | EXT4_INODE_DIRTY = 8, | |
448 | EXT4_INODE_COMPRBLK = 9, /* One or more compressed clusters */ | |
449 | EXT4_INODE_NOCOMPR = 10, /* Don't compress */ | |
450 | EXT4_INODE_ECOMPR = 11, /* Compression error */ | |
451 | /* End compression flags --- maybe not all used */ | |
452 | EXT4_INODE_INDEX = 12, /* hash-indexed directory */ | |
453 | EXT4_INODE_IMAGIC = 13, /* AFS directory */ | |
454 | EXT4_INODE_JOURNAL_DATA = 14, /* file data should be journaled */ | |
455 | EXT4_INODE_NOTAIL = 15, /* file tail should not be merged */ | |
456 | EXT4_INODE_DIRSYNC = 16, /* dirsync behaviour (directories only) */ | |
457 | EXT4_INODE_TOPDIR = 17, /* Top of directory hierarchies*/ | |
458 | EXT4_INODE_HUGE_FILE = 18, /* Set to each huge file */ | |
459 | EXT4_INODE_EXTENTS = 19, /* Inode uses extents */ | |
460 | EXT4_INODE_EA_INODE = 21, /* Inode used for large EA */ | |
461 | EXT4_INODE_EOFBLOCKS = 22, /* Blocks allocated beyond EOF */ | |
462 | EXT4_INODE_INLINE_DATA = 28, /* Data in inode. */ | |
463 | EXT4_INODE_RESERVED = 31, /* reserved for ext4 lib */ | |
464 | }; | |
465 | ||
466 | #define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG)) | |
467 | #define CHECK_FLAG_VALUE(FLAG) if (!TEST_FLAG_VALUE(FLAG)) { \ | |
468 | printk(KERN_EMERG "EXT4 flag fail: " #FLAG ": %d %d\n", \ | |
469 | EXT4_##FLAG##_FL, EXT4_INODE_##FLAG); BUG_ON(1); } | |
470 | ||
471 | /* | |
472 | * Since it's pretty easy to mix up bit numbers and hex values, and we | |
473 | * can't do a compile-time test for ENUM values, we use a run-time | |
474 | * test to make sure that EXT4_XXX_FL is consistent with respect to | |
475 | * EXT4_INODE_XXX. If all is well the printk and BUG_ON will all drop | |
476 | * out so it won't cost any extra space in the compiled kernel image. | |
477 | * But it's important that these values are the same, since we are | |
478 | * using EXT4_INODE_XXX to test for the flag values, but EXT4_XX_FL | |
479 | * must be consistent with the values of FS_XXX_FL defined in | |
480 | * include/linux/fs.h and the on-disk values found in ext2, ext3, and | |
481 | * ext4 filesystems, and of course the values defined in e2fsprogs. | |
482 | * | |
483 | * It's not paranoia if the Murphy's Law really *is* out to get you. :-) | |
484 | */ | |
485 | static inline void ext4_check_flag_values(void) | |
486 | { | |
487 | CHECK_FLAG_VALUE(SECRM); | |
488 | CHECK_FLAG_VALUE(UNRM); | |
489 | CHECK_FLAG_VALUE(COMPR); | |
490 | CHECK_FLAG_VALUE(SYNC); | |
491 | CHECK_FLAG_VALUE(IMMUTABLE); | |
492 | CHECK_FLAG_VALUE(APPEND); | |
493 | CHECK_FLAG_VALUE(NODUMP); | |
494 | CHECK_FLAG_VALUE(NOATIME); | |
495 | CHECK_FLAG_VALUE(DIRTY); | |
496 | CHECK_FLAG_VALUE(COMPRBLK); | |
497 | CHECK_FLAG_VALUE(NOCOMPR); | |
498 | CHECK_FLAG_VALUE(ECOMPR); | |
499 | CHECK_FLAG_VALUE(INDEX); | |
500 | CHECK_FLAG_VALUE(IMAGIC); | |
501 | CHECK_FLAG_VALUE(JOURNAL_DATA); | |
502 | CHECK_FLAG_VALUE(NOTAIL); | |
503 | CHECK_FLAG_VALUE(DIRSYNC); | |
504 | CHECK_FLAG_VALUE(TOPDIR); | |
505 | CHECK_FLAG_VALUE(HUGE_FILE); | |
506 | CHECK_FLAG_VALUE(EXTENTS); | |
507 | CHECK_FLAG_VALUE(EA_INODE); | |
508 | CHECK_FLAG_VALUE(EOFBLOCKS); | |
509 | CHECK_FLAG_VALUE(INLINE_DATA); | |
510 | CHECK_FLAG_VALUE(RESERVED); | |
511 | } | |
512 | ||
513 | /* Used to pass group descriptor data when online resize is done */ | |
514 | struct ext4_new_group_input { | |
515 | __u32 group; /* Group number for this data */ | |
516 | __u64 block_bitmap; /* Absolute block number of block bitmap */ | |
517 | __u64 inode_bitmap; /* Absolute block number of inode bitmap */ | |
518 | __u64 inode_table; /* Absolute block number of inode table start */ | |
519 | __u32 blocks_count; /* Total number of blocks in this group */ | |
520 | __u16 reserved_blocks; /* Number of reserved blocks in this group */ | |
521 | __u16 unused; | |
522 | }; | |
523 | ||
524 | #if defined(__KERNEL__) && defined(CONFIG_COMPAT) | |
525 | struct compat_ext4_new_group_input { | |
526 | u32 group; | |
527 | compat_u64 block_bitmap; | |
528 | compat_u64 inode_bitmap; | |
529 | compat_u64 inode_table; | |
530 | u32 blocks_count; | |
531 | u16 reserved_blocks; | |
532 | u16 unused; | |
533 | }; | |
534 | #endif | |
535 | ||
536 | /* The struct ext4_new_group_input in kernel space, with free_blocks_count */ | |
537 | struct ext4_new_group_data { | |
538 | __u32 group; | |
539 | __u64 block_bitmap; | |
540 | __u64 inode_bitmap; | |
541 | __u64 inode_table; | |
542 | __u32 blocks_count; | |
543 | __u16 reserved_blocks; | |
544 | __u16 unused; | |
545 | __u32 free_blocks_count; | |
546 | }; | |
547 | ||
548 | /* Indexes used to index group tables in ext4_new_group_data */ | |
549 | enum { | |
550 | BLOCK_BITMAP = 0, /* block bitmap */ | |
551 | INODE_BITMAP, /* inode bitmap */ | |
552 | INODE_TABLE, /* inode tables */ | |
553 | GROUP_TABLE_COUNT, | |
554 | }; | |
555 | ||
556 | /* | |
557 | * Flags used by ext4_map_blocks() | |
558 | */ | |
559 | /* Allocate any needed blocks and/or convert an unitialized | |
560 | extent to be an initialized ext4 */ | |
561 | #define EXT4_GET_BLOCKS_CREATE 0x0001 | |
562 | /* Request the creation of an unitialized extent */ | |
563 | #define EXT4_GET_BLOCKS_UNINIT_EXT 0x0002 | |
564 | #define EXT4_GET_BLOCKS_CREATE_UNINIT_EXT (EXT4_GET_BLOCKS_UNINIT_EXT|\ | |
565 | EXT4_GET_BLOCKS_CREATE) | |
566 | /* Caller is from the delayed allocation writeout path, | |
567 | so set the magic i_delalloc_reserve_flag after taking the | |
568 | inode allocation semaphore for */ | |
569 | #define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004 | |
570 | /* caller is from the direct IO path, request to creation of an | |
571 | unitialized extents if not allocated, split the uninitialized | |
572 | extent if blocks has been preallocated already*/ | |
573 | #define EXT4_GET_BLOCKS_PRE_IO 0x0008 | |
574 | #define EXT4_GET_BLOCKS_CONVERT 0x0010 | |
575 | #define EXT4_GET_BLOCKS_IO_CREATE_EXT (EXT4_GET_BLOCKS_PRE_IO|\ | |
576 | EXT4_GET_BLOCKS_CREATE_UNINIT_EXT) | |
577 | /* Convert extent to initialized after IO complete */ | |
578 | #define EXT4_GET_BLOCKS_IO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT|\ | |
579 | EXT4_GET_BLOCKS_CREATE_UNINIT_EXT) | |
580 | /* Punch out blocks of an extent */ | |
581 | #define EXT4_GET_BLOCKS_PUNCH_OUT_EXT 0x0020 | |
582 | /* Don't normalize allocation size (used for fallocate) */ | |
583 | #define EXT4_GET_BLOCKS_NO_NORMALIZE 0x0040 | |
584 | /* Request will not result in inode size update (user for fallocate) */ | |
585 | #define EXT4_GET_BLOCKS_KEEP_SIZE 0x0080 | |
586 | /* Do not take i_data_sem locking in ext4_map_blocks */ | |
587 | #define EXT4_GET_BLOCKS_NO_LOCK 0x0100 | |
588 | ||
589 | /* | |
590 | * Flags used by ext4_free_blocks | |
591 | */ | |
592 | #define EXT4_FREE_BLOCKS_METADATA 0x0001 | |
593 | #define EXT4_FREE_BLOCKS_FORGET 0x0002 | |
594 | #define EXT4_FREE_BLOCKS_VALIDATED 0x0004 | |
595 | #define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE 0x0008 | |
596 | #define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER 0x0010 | |
597 | #define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER 0x0020 | |
598 | ||
599 | /* | |
600 | * Flags used by ext4_discard_partial_page_buffers | |
601 | */ | |
602 | #define EXT4_DISCARD_PARTIAL_PG_ZERO_UNMAPPED 0x0001 | |
603 | ||
604 | /* | |
605 | * ioctl commands | |
606 | */ | |
607 | #define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS | |
608 | #define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS | |
609 | #define EXT4_IOC_GETVERSION _IOR('f', 3, long) | |
610 | #define EXT4_IOC_SETVERSION _IOW('f', 4, long) | |
611 | #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION | |
612 | #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION | |
613 | #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long) | |
614 | #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long) | |
615 | #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long) | |
616 | #define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input) | |
617 | #define EXT4_IOC_MIGRATE _IO('f', 9) | |
618 | /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */ | |
619 | /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */ | |
620 | #define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12) | |
621 | #define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent) | |
622 | #define EXT4_IOC_RESIZE_FS _IOW('f', 16, __u64) | |
623 | ||
624 | #if defined(__KERNEL__) && defined(CONFIG_COMPAT) | |
625 | /* | |
626 | * ioctl commands in 32 bit emulation | |
627 | */ | |
628 | #define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS | |
629 | #define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS | |
630 | #define EXT4_IOC32_GETVERSION _IOR('f', 3, int) | |
631 | #define EXT4_IOC32_SETVERSION _IOW('f', 4, int) | |
632 | #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int) | |
633 | #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int) | |
634 | #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int) | |
635 | #define EXT4_IOC32_GROUP_ADD _IOW('f', 8, struct compat_ext4_new_group_input) | |
636 | #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION | |
637 | #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION | |
638 | #endif | |
639 | ||
640 | /* Max physical block we can address w/o extents */ | |
641 | #define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF | |
642 | ||
643 | /* | |
644 | * Structure of an inode on the disk | |
645 | */ | |
646 | struct ext4_inode { | |
647 | __le16 i_mode; /* File mode */ | |
648 | __le16 i_uid; /* Low 16 bits of Owner Uid */ | |
649 | __le32 i_size_lo; /* Size in bytes */ | |
650 | __le32 i_atime; /* Access time */ | |
651 | __le32 i_ctime; /* Inode Change time */ | |
652 | __le32 i_mtime; /* Modification time */ | |
653 | __le32 i_dtime; /* Deletion Time */ | |
654 | __le16 i_gid; /* Low 16 bits of Group Id */ | |
655 | __le16 i_links_count; /* Links count */ | |
656 | __le32 i_blocks_lo; /* Blocks count */ | |
657 | __le32 i_flags; /* File flags */ | |
658 | union { | |
659 | struct { | |
660 | __le32 l_i_version; | |
661 | } linux1; | |
662 | struct { | |
663 | __u32 h_i_translator; | |
664 | } hurd1; | |
665 | struct { | |
666 | __u32 m_i_reserved1; | |
667 | } masix1; | |
668 | } osd1; /* OS dependent 1 */ | |
669 | __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */ | |
670 | __le32 i_generation; /* File version (for NFS) */ | |
671 | __le32 i_file_acl_lo; /* File ACL */ | |
672 | __le32 i_size_high; | |
673 | __le32 i_obso_faddr; /* Obsoleted fragment address */ | |
674 | union { | |
675 | struct { | |
676 | __le16 l_i_blocks_high; /* were l_i_reserved1 */ | |
677 | __le16 l_i_file_acl_high; | |
678 | __le16 l_i_uid_high; /* these 2 fields */ | |
679 | __le16 l_i_gid_high; /* were reserved2[0] */ | |
680 | __le16 l_i_checksum_lo;/* crc32c(uuid+inum+inode) LE */ | |
681 | __le16 l_i_reserved; | |
682 | } linux2; | |
683 | struct { | |
684 | __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ | |
685 | __u16 h_i_mode_high; | |
686 | __u16 h_i_uid_high; | |
687 | __u16 h_i_gid_high; | |
688 | __u32 h_i_author; | |
689 | } hurd2; | |
690 | struct { | |
691 | __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ | |
692 | __le16 m_i_file_acl_high; | |
693 | __u32 m_i_reserved2[2]; | |
694 | } masix2; | |
695 | } osd2; /* OS dependent 2 */ | |
696 | __le16 i_extra_isize; | |
697 | __le16 i_checksum_hi; /* crc32c(uuid+inum+inode) BE */ | |
698 | __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */ | |
699 | __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */ | |
700 | __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */ | |
701 | __le32 i_crtime; /* File Creation time */ | |
702 | __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */ | |
703 | __le32 i_version_hi; /* high 32 bits for 64-bit version */ | |
704 | }; | |
705 | ||
706 | struct move_extent { | |
707 | __u32 reserved; /* should be zero */ | |
708 | __u32 donor_fd; /* donor file descriptor */ | |
709 | __u64 orig_start; /* logical start offset in block for orig */ | |
710 | __u64 donor_start; /* logical start offset in block for donor */ | |
711 | __u64 len; /* block length to be moved */ | |
712 | __u64 moved_len; /* moved block length */ | |
713 | }; | |
714 | ||
715 | #define EXT4_EPOCH_BITS 2 | |
716 | #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1) | |
717 | #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS) | |
718 | ||
719 | /* | |
720 | * Extended fields will fit into an inode if the filesystem was formatted | |
721 | * with large inodes (-I 256 or larger) and there are not currently any EAs | |
722 | * consuming all of the available space. For new inodes we always reserve | |
723 | * enough space for the kernel's known extended fields, but for inodes | |
724 | * created with an old kernel this might not have been the case. None of | |
725 | * the extended inode fields is critical for correct filesystem operation. | |
726 | * This macro checks if a certain field fits in the inode. Note that | |
727 | * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize | |
728 | */ | |
729 | #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \ | |
730 | ((offsetof(typeof(*ext4_inode), field) + \ | |
731 | sizeof((ext4_inode)->field)) \ | |
732 | <= (EXT4_GOOD_OLD_INODE_SIZE + \ | |
733 | (einode)->i_extra_isize)) \ | |
734 | ||
735 | static inline __le32 ext4_encode_extra_time(struct timespec *time) | |
736 | { | |
737 | return cpu_to_le32((sizeof(time->tv_sec) > 4 ? | |
738 | (time->tv_sec >> 32) & EXT4_EPOCH_MASK : 0) | | |
739 | ((time->tv_nsec << EXT4_EPOCH_BITS) & EXT4_NSEC_MASK)); | |
740 | } | |
741 | ||
742 | static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra) | |
743 | { | |
744 | if (sizeof(time->tv_sec) > 4) | |
745 | time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) | |
746 | << 32; | |
747 | time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS; | |
748 | } | |
749 | ||
750 | #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \ | |
751 | do { \ | |
752 | (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \ | |
753 | if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \ | |
754 | (raw_inode)->xtime ## _extra = \ | |
755 | ext4_encode_extra_time(&(inode)->xtime); \ | |
756 | } while (0) | |
757 | ||
758 | #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \ | |
759 | do { \ | |
760 | if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ | |
761 | (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \ | |
762 | if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ | |
763 | (raw_inode)->xtime ## _extra = \ | |
764 | ext4_encode_extra_time(&(einode)->xtime); \ | |
765 | } while (0) | |
766 | ||
767 | #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \ | |
768 | do { \ | |
769 | (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \ | |
770 | if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \ | |
771 | ext4_decode_extra_time(&(inode)->xtime, \ | |
772 | raw_inode->xtime ## _extra); \ | |
773 | else \ | |
774 | (inode)->xtime.tv_nsec = 0; \ | |
775 | } while (0) | |
776 | ||
777 | #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \ | |
778 | do { \ | |
779 | if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ | |
780 | (einode)->xtime.tv_sec = \ | |
781 | (signed)le32_to_cpu((raw_inode)->xtime); \ | |
782 | if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ | |
783 | ext4_decode_extra_time(&(einode)->xtime, \ | |
784 | raw_inode->xtime ## _extra); \ | |
785 | else \ | |
786 | (einode)->xtime.tv_nsec = 0; \ | |
787 | } while (0) | |
788 | ||
789 | #define i_disk_version osd1.linux1.l_i_version | |
790 | ||
791 | #if defined(__KERNEL__) || defined(__linux__) | |
792 | #define i_reserved1 osd1.linux1.l_i_reserved1 | |
793 | #define i_file_acl_high osd2.linux2.l_i_file_acl_high | |
794 | #define i_blocks_high osd2.linux2.l_i_blocks_high | |
795 | #define i_uid_low i_uid | |
796 | #define i_gid_low i_gid | |
797 | #define i_uid_high osd2.linux2.l_i_uid_high | |
798 | #define i_gid_high osd2.linux2.l_i_gid_high | |
799 | #define i_checksum_lo osd2.linux2.l_i_checksum_lo | |
800 | ||
801 | #elif defined(__GNU__) | |
802 | ||
803 | #define i_translator osd1.hurd1.h_i_translator | |
804 | #define i_uid_high osd2.hurd2.h_i_uid_high | |
805 | #define i_gid_high osd2.hurd2.h_i_gid_high | |
806 | #define i_author osd2.hurd2.h_i_author | |
807 | ||
808 | #elif defined(__masix__) | |
809 | ||
810 | #define i_reserved1 osd1.masix1.m_i_reserved1 | |
811 | #define i_file_acl_high osd2.masix2.m_i_file_acl_high | |
812 | #define i_reserved2 osd2.masix2.m_i_reserved2 | |
813 | ||
814 | #endif /* defined(__KERNEL__) || defined(__linux__) */ | |
815 | ||
816 | /* | |
817 | * storage for cached extent | |
818 | * If ec_len == 0, then the cache is invalid. | |
819 | * If ec_start == 0, then the cache represents a gap (null mapping) | |
820 | */ | |
821 | struct ext4_ext_cache { | |
822 | ext4_fsblk_t ec_start; | |
823 | ext4_lblk_t ec_block; | |
824 | __u32 ec_len; /* must be 32bit to return holes */ | |
825 | }; | |
826 | ||
827 | #include "extents_status.h" | |
828 | ||
829 | /* | |
830 | * fourth extended file system inode data in memory | |
831 | */ | |
832 | struct ext4_inode_info { | |
833 | __le32 i_data[15]; /* unconverted */ | |
834 | __u32 i_dtime; | |
835 | ext4_fsblk_t i_file_acl; | |
836 | ||
837 | /* | |
838 | * i_block_group is the number of the block group which contains | |
839 | * this file's inode. Constant across the lifetime of the inode, | |
840 | * it is ued for making block allocation decisions - we try to | |
841 | * place a file's data blocks near its inode block, and new inodes | |
842 | * near to their parent directory's inode. | |
843 | */ | |
844 | ext4_group_t i_block_group; | |
845 | ext4_lblk_t i_dir_start_lookup; | |
846 | #if (BITS_PER_LONG < 64) | |
847 | unsigned long i_state_flags; /* Dynamic state flags */ | |
848 | #endif | |
849 | unsigned long i_flags; | |
850 | ||
851 | #ifdef CONFIG_EXT4_FS_XATTR | |
852 | /* | |
853 | * Extended attributes can be read independently of the main file | |
854 | * data. Taking i_mutex even when reading would cause contention | |
855 | * between readers of EAs and writers of regular file data, so | |
856 | * instead we synchronize on xattr_sem when reading or changing | |
857 | * EAs. | |
858 | */ | |
859 | struct rw_semaphore xattr_sem; | |
860 | #endif | |
861 | ||
862 | struct list_head i_orphan; /* unlinked but open inodes */ | |
863 | ||
864 | /* | |
865 | * i_disksize keeps track of what the inode size is ON DISK, not | |
866 | * in memory. During truncate, i_size is set to the new size by | |
867 | * the VFS prior to calling ext4_truncate(), but the filesystem won't | |
868 | * set i_disksize to 0 until the truncate is actually under way. | |
869 | * | |
870 | * The intent is that i_disksize always represents the blocks which | |
871 | * are used by this file. This allows recovery to restart truncate | |
872 | * on orphans if we crash during truncate. We actually write i_disksize | |
873 | * into the on-disk inode when writing inodes out, instead of i_size. | |
874 | * | |
875 | * The only time when i_disksize and i_size may be different is when | |
876 | * a truncate is in progress. The only things which change i_disksize | |
877 | * are ext4_get_block (growth) and ext4_truncate (shrinkth). | |
878 | */ | |
879 | loff_t i_disksize; | |
880 | ||
881 | /* | |
882 | * i_data_sem is for serialising ext4_truncate() against | |
883 | * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's | |
884 | * data tree are chopped off during truncate. We can't do that in | |
885 | * ext4 because whenever we perform intermediate commits during | |
886 | * truncate, the inode and all the metadata blocks *must* be in a | |
887 | * consistent state which allows truncation of the orphans to restart | |
888 | * during recovery. Hence we must fix the get_block-vs-truncate race | |
889 | * by other means, so we have i_data_sem. | |
890 | */ | |
891 | struct rw_semaphore i_data_sem; | |
892 | struct inode vfs_inode; | |
893 | struct jbd2_inode *jinode; | |
894 | ||
895 | struct ext4_ext_cache i_cached_extent; | |
896 | /* | |
897 | * File creation time. Its function is same as that of | |
898 | * struct timespec i_{a,c,m}time in the generic inode. | |
899 | */ | |
900 | struct timespec i_crtime; | |
901 | ||
902 | /* mballoc */ | |
903 | struct list_head i_prealloc_list; | |
904 | spinlock_t i_prealloc_lock; | |
905 | ||
906 | /* extents status tree */ | |
907 | struct ext4_es_tree i_es_tree; | |
908 | rwlock_t i_es_lock; | |
909 | ||
910 | /* ialloc */ | |
911 | ext4_group_t i_last_alloc_group; | |
912 | ||
913 | /* allocation reservation info for delalloc */ | |
914 | /* In case of bigalloc, these refer to clusters rather than blocks */ | |
915 | unsigned int i_reserved_data_blocks; | |
916 | unsigned int i_reserved_meta_blocks; | |
917 | unsigned int i_allocated_meta_blocks; | |
918 | ext4_lblk_t i_da_metadata_calc_last_lblock; | |
919 | int i_da_metadata_calc_len; | |
920 | ||
921 | /* on-disk additional length */ | |
922 | __u16 i_extra_isize; | |
923 | ||
924 | /* Indicate the inline data space. */ | |
925 | u16 i_inline_off; | |
926 | u16 i_inline_size; | |
927 | ||
928 | #ifdef CONFIG_QUOTA | |
929 | /* quota space reservation, managed internally by quota code */ | |
930 | qsize_t i_reserved_quota; | |
931 | #endif | |
932 | ||
933 | /* completed IOs that might need unwritten extents handling */ | |
934 | struct list_head i_completed_io_list; | |
935 | spinlock_t i_completed_io_lock; | |
936 | atomic_t i_ioend_count; /* Number of outstanding io_end structs */ | |
937 | atomic_t i_unwritten; /* Nr. of inflight conversions pending */ | |
938 | ||
939 | spinlock_t i_block_reservation_lock; | |
940 | ||
941 | /* | |
942 | * Transactions that contain inode's metadata needed to complete | |
943 | * fsync and fdatasync, respectively. | |
944 | */ | |
945 | tid_t i_sync_tid; | |
946 | tid_t i_datasync_tid; | |
947 | ||
948 | /* Precomputed uuid+inum+igen checksum for seeding inode checksums */ | |
949 | __u32 i_csum_seed; | |
950 | }; | |
951 | ||
952 | /* | |
953 | * File system states | |
954 | */ | |
955 | #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */ | |
956 | #define EXT4_ERROR_FS 0x0002 /* Errors detected */ | |
957 | #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */ | |
958 | ||
959 | /* | |
960 | * Misc. filesystem flags | |
961 | */ | |
962 | #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */ | |
963 | #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */ | |
964 | #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */ | |
965 | ||
966 | /* | |
967 | * Mount flags | |
968 | */ | |
969 | #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */ | |
970 | #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */ | |
971 | #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */ | |
972 | #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */ | |
973 | #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */ | |
974 | #define EXT4_MOUNT_ERRORS_MASK 0x00070 | |
975 | #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */ | |
976 | #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/ | |
977 | #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */ | |
978 | #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */ | |
979 | #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */ | |
980 | #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */ | |
981 | #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */ | |
982 | #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */ | |
983 | #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */ | |
984 | #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */ | |
985 | #define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */ | |
986 | #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */ | |
987 | #define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */ | |
988 | #define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */ | |
989 | #define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */ | |
990 | #define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000 /* Enable support for dio read nolocking */ | |
991 | #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */ | |
992 | #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */ | |
993 | #define EXT4_MOUNT_MBLK_IO_SUBMIT 0x4000000 /* multi-block io submits */ | |
994 | #define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */ | |
995 | #define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */ | |
996 | #define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */ | |
997 | #define EXT4_MOUNT_DISCARD 0x40000000 /* Issue DISCARD requests */ | |
998 | #define EXT4_MOUNT_INIT_INODE_TABLE 0x80000000 /* Initialize uninitialized itables */ | |
999 | ||
1000 | #define EXT4_MOUNT2_EXPLICIT_DELALLOC 0x00000001 /* User explicitly | |
1001 | specified delalloc */ | |
1002 | ||
1003 | #define clear_opt(sb, opt) EXT4_SB(sb)->s_mount_opt &= \ | |
1004 | ~EXT4_MOUNT_##opt | |
1005 | #define set_opt(sb, opt) EXT4_SB(sb)->s_mount_opt |= \ | |
1006 | EXT4_MOUNT_##opt | |
1007 | #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \ | |
1008 | EXT4_MOUNT_##opt) | |
1009 | ||
1010 | #define clear_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 &= \ | |
1011 | ~EXT4_MOUNT2_##opt | |
1012 | #define set_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 |= \ | |
1013 | EXT4_MOUNT2_##opt | |
1014 | #define test_opt2(sb, opt) (EXT4_SB(sb)->s_mount_opt2 & \ | |
1015 | EXT4_MOUNT2_##opt) | |
1016 | ||
1017 | #define ext4_test_and_set_bit __test_and_set_bit_le | |
1018 | #define ext4_set_bit __set_bit_le | |
1019 | #define ext4_set_bit_atomic ext2_set_bit_atomic | |
1020 | #define ext4_test_and_clear_bit __test_and_clear_bit_le | |
1021 | #define ext4_clear_bit __clear_bit_le | |
1022 | #define ext4_clear_bit_atomic ext2_clear_bit_atomic | |
1023 | #define ext4_test_bit test_bit_le | |
1024 | #define ext4_find_next_zero_bit find_next_zero_bit_le | |
1025 | #define ext4_find_next_bit find_next_bit_le | |
1026 | ||
1027 | extern void ext4_set_bits(void *bm, int cur, int len); | |
1028 | ||
1029 | /* | |
1030 | * Maximal mount counts between two filesystem checks | |
1031 | */ | |
1032 | #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ | |
1033 | #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */ | |
1034 | ||
1035 | /* | |
1036 | * Behaviour when detecting errors | |
1037 | */ | |
1038 | #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */ | |
1039 | #define EXT4_ERRORS_RO 2 /* Remount fs read-only */ | |
1040 | #define EXT4_ERRORS_PANIC 3 /* Panic */ | |
1041 | #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE | |
1042 | ||
1043 | /* Metadata checksum algorithm codes */ | |
1044 | #define EXT4_CRC32C_CHKSUM 1 | |
1045 | ||
1046 | /* | |
1047 | * Structure of the super block | |
1048 | */ | |
1049 | struct ext4_super_block { | |
1050 | /*00*/ __le32 s_inodes_count; /* Inodes count */ | |
1051 | __le32 s_blocks_count_lo; /* Blocks count */ | |
1052 | __le32 s_r_blocks_count_lo; /* Reserved blocks count */ | |
1053 | __le32 s_free_blocks_count_lo; /* Free blocks count */ | |
1054 | /*10*/ __le32 s_free_inodes_count; /* Free inodes count */ | |
1055 | __le32 s_first_data_block; /* First Data Block */ | |
1056 | __le32 s_log_block_size; /* Block size */ | |
1057 | __le32 s_log_cluster_size; /* Allocation cluster size */ | |
1058 | /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */ | |
1059 | __le32 s_clusters_per_group; /* # Clusters per group */ | |
1060 | __le32 s_inodes_per_group; /* # Inodes per group */ | |
1061 | __le32 s_mtime; /* Mount time */ | |
1062 | /*30*/ __le32 s_wtime; /* Write time */ | |
1063 | __le16 s_mnt_count; /* Mount count */ | |
1064 | __le16 s_max_mnt_count; /* Maximal mount count */ | |
1065 | __le16 s_magic; /* Magic signature */ | |
1066 | __le16 s_state; /* File system state */ | |
1067 | __le16 s_errors; /* Behaviour when detecting errors */ | |
1068 | __le16 s_minor_rev_level; /* minor revision level */ | |
1069 | /*40*/ __le32 s_lastcheck; /* time of last check */ | |
1070 | __le32 s_checkinterval; /* max. time between checks */ | |
1071 | __le32 s_creator_os; /* OS */ | |
1072 | __le32 s_rev_level; /* Revision level */ | |
1073 | /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */ | |
1074 | __le16 s_def_resgid; /* Default gid for reserved blocks */ | |
1075 | /* | |
1076 | * These fields are for EXT4_DYNAMIC_REV superblocks only. | |
1077 | * | |
1078 | * Note: the difference between the compatible feature set and | |
1079 | * the incompatible feature set is that if there is a bit set | |
1080 | * in the incompatible feature set that the kernel doesn't | |
1081 | * know about, it should refuse to mount the filesystem. | |
1082 | * | |
1083 | * e2fsck's requirements are more strict; if it doesn't know | |
1084 | * about a feature in either the compatible or incompatible | |
1085 | * feature set, it must abort and not try to meddle with | |
1086 | * things it doesn't understand... | |
1087 | */ | |
1088 | __le32 s_first_ino; /* First non-reserved inode */ | |
1089 | __le16 s_inode_size; /* size of inode structure */ | |
1090 | __le16 s_block_group_nr; /* block group # of this superblock */ | |
1091 | __le32 s_feature_compat; /* compatible feature set */ | |
1092 | /*60*/ __le32 s_feature_incompat; /* incompatible feature set */ | |
1093 | __le32 s_feature_ro_compat; /* readonly-compatible feature set */ | |
1094 | /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */ | |
1095 | /*78*/ char s_volume_name[16]; /* volume name */ | |
1096 | /*88*/ char s_last_mounted[64]; /* directory where last mounted */ | |
1097 | /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */ | |
1098 | /* | |
1099 | * Performance hints. Directory preallocation should only | |
1100 | * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on. | |
1101 | */ | |
1102 | __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ | |
1103 | __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ | |
1104 | __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */ | |
1105 | /* | |
1106 | * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set. | |
1107 | */ | |
1108 | /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */ | |
1109 | /*E0*/ __le32 s_journal_inum; /* inode number of journal file */ | |
1110 | __le32 s_journal_dev; /* device number of journal file */ | |
1111 | __le32 s_last_orphan; /* start of list of inodes to delete */ | |
1112 | __le32 s_hash_seed[4]; /* HTREE hash seed */ | |
1113 | __u8 s_def_hash_version; /* Default hash version to use */ | |
1114 | __u8 s_jnl_backup_type; | |
1115 | __le16 s_desc_size; /* size of group descriptor */ | |
1116 | /*100*/ __le32 s_default_mount_opts; | |
1117 | __le32 s_first_meta_bg; /* First metablock block group */ | |
1118 | __le32 s_mkfs_time; /* When the filesystem was created */ | |
1119 | __le32 s_jnl_blocks[17]; /* Backup of the journal inode */ | |
1120 | /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */ | |
1121 | /*150*/ __le32 s_blocks_count_hi; /* Blocks count */ | |
1122 | __le32 s_r_blocks_count_hi; /* Reserved blocks count */ | |
1123 | __le32 s_free_blocks_count_hi; /* Free blocks count */ | |
1124 | __le16 s_min_extra_isize; /* All inodes have at least # bytes */ | |
1125 | __le16 s_want_extra_isize; /* New inodes should reserve # bytes */ | |
1126 | __le32 s_flags; /* Miscellaneous flags */ | |
1127 | __le16 s_raid_stride; /* RAID stride */ | |
1128 | __le16 s_mmp_update_interval; /* # seconds to wait in MMP checking */ | |
1129 | __le64 s_mmp_block; /* Block for multi-mount protection */ | |
1130 | __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/ | |
1131 | __u8 s_log_groups_per_flex; /* FLEX_BG group size */ | |
1132 | __u8 s_checksum_type; /* metadata checksum algorithm used */ | |
1133 | __le16 s_reserved_pad; | |
1134 | __le64 s_kbytes_written; /* nr of lifetime kilobytes written */ | |
1135 | __le32 s_snapshot_inum; /* Inode number of active snapshot */ | |
1136 | __le32 s_snapshot_id; /* sequential ID of active snapshot */ | |
1137 | __le64 s_snapshot_r_blocks_count; /* reserved blocks for active | |
1138 | snapshot's future use */ | |
1139 | __le32 s_snapshot_list; /* inode number of the head of the | |
1140 | on-disk snapshot list */ | |
1141 | #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count) | |
1142 | __le32 s_error_count; /* number of fs errors */ | |
1143 | __le32 s_first_error_time; /* first time an error happened */ | |
1144 | __le32 s_first_error_ino; /* inode involved in first error */ | |
1145 | __le64 s_first_error_block; /* block involved of first error */ | |
1146 | __u8 s_first_error_func[32]; /* function where the error happened */ | |
1147 | __le32 s_first_error_line; /* line number where error happened */ | |
1148 | __le32 s_last_error_time; /* most recent time of an error */ | |
1149 | __le32 s_last_error_ino; /* inode involved in last error */ | |
1150 | __le32 s_last_error_line; /* line number where error happened */ | |
1151 | __le64 s_last_error_block; /* block involved of last error */ | |
1152 | __u8 s_last_error_func[32]; /* function where the error happened */ | |
1153 | #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts) | |
1154 | __u8 s_mount_opts[64]; | |
1155 | __le32 s_usr_quota_inum; /* inode for tracking user quota */ | |
1156 | __le32 s_grp_quota_inum; /* inode for tracking group quota */ | |
1157 | __le32 s_overhead_clusters; /* overhead blocks/clusters in fs */ | |
1158 | __le32 s_reserved[108]; /* Padding to the end of the block */ | |
1159 | __le32 s_checksum; /* crc32c(superblock) */ | |
1160 | }; | |
1161 | ||
1162 | #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START) | |
1163 | ||
1164 | #ifdef __KERNEL__ | |
1165 | ||
1166 | /* | |
1167 | * run-time mount flags | |
1168 | */ | |
1169 | #define EXT4_MF_MNTDIR_SAMPLED 0x0001 | |
1170 | #define EXT4_MF_FS_ABORTED 0x0002 /* Fatal error detected */ | |
1171 | ||
1172 | /* | |
1173 | * fourth extended-fs super-block data in memory | |
1174 | */ | |
1175 | struct ext4_sb_info { | |
1176 | unsigned long s_desc_size; /* Size of a group descriptor in bytes */ | |
1177 | unsigned long s_inodes_per_block;/* Number of inodes per block */ | |
1178 | unsigned long s_blocks_per_group;/* Number of blocks in a group */ | |
1179 | unsigned long s_clusters_per_group; /* Number of clusters in a group */ | |
1180 | unsigned long s_inodes_per_group;/* Number of inodes in a group */ | |
1181 | unsigned long s_itb_per_group; /* Number of inode table blocks per group */ | |
1182 | unsigned long s_gdb_count; /* Number of group descriptor blocks */ | |
1183 | unsigned long s_desc_per_block; /* Number of group descriptors per block */ | |
1184 | ext4_group_t s_groups_count; /* Number of groups in the fs */ | |
1185 | ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */ | |
1186 | unsigned long s_overhead; /* # of fs overhead clusters */ | |
1187 | unsigned int s_cluster_ratio; /* Number of blocks per cluster */ | |
1188 | unsigned int s_cluster_bits; /* log2 of s_cluster_ratio */ | |
1189 | loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */ | |
1190 | struct buffer_head * s_sbh; /* Buffer containing the super block */ | |
1191 | struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */ | |
1192 | struct buffer_head **s_group_desc; | |
1193 | unsigned int s_mount_opt; | |
1194 | unsigned int s_mount_opt2; | |
1195 | unsigned int s_mount_flags; | |
1196 | unsigned int s_def_mount_opt; | |
1197 | ext4_fsblk_t s_sb_block; | |
1198 | kuid_t s_resuid; | |
1199 | kgid_t s_resgid; | |
1200 | unsigned short s_mount_state; | |
1201 | unsigned short s_pad; | |
1202 | int s_addr_per_block_bits; | |
1203 | int s_desc_per_block_bits; | |
1204 | int s_inode_size; | |
1205 | int s_first_ino; | |
1206 | unsigned int s_inode_readahead_blks; | |
1207 | unsigned int s_inode_goal; | |
1208 | spinlock_t s_next_gen_lock; | |
1209 | u32 s_next_generation; | |
1210 | u32 s_hash_seed[4]; | |
1211 | int s_def_hash_version; | |
1212 | int s_hash_unsigned; /* 3 if hash should be signed, 0 if not */ | |
1213 | struct percpu_counter s_freeclusters_counter; | |
1214 | struct percpu_counter s_freeinodes_counter; | |
1215 | struct percpu_counter s_dirs_counter; | |
1216 | struct percpu_counter s_dirtyclusters_counter; | |
1217 | struct blockgroup_lock *s_blockgroup_lock; | |
1218 | struct proc_dir_entry *s_proc; | |
1219 | struct kobject s_kobj; | |
1220 | struct completion s_kobj_unregister; | |
1221 | struct super_block *s_sb; | |
1222 | ||
1223 | /* Journaling */ | |
1224 | struct journal_s *s_journal; | |
1225 | struct list_head s_orphan; | |
1226 | struct mutex s_orphan_lock; | |
1227 | unsigned long s_resize_flags; /* Flags indicating if there | |
1228 | is a resizer */ | |
1229 | unsigned long s_commit_interval; | |
1230 | u32 s_max_batch_time; | |
1231 | u32 s_min_batch_time; | |
1232 | struct block_device *journal_bdev; | |
1233 | #ifdef CONFIG_QUOTA | |
1234 | char *s_qf_names[MAXQUOTAS]; /* Names of quota files with journalled quota */ | |
1235 | int s_jquota_fmt; /* Format of quota to use */ | |
1236 | #endif | |
1237 | unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */ | |
1238 | struct rb_root system_blks; | |
1239 | ||
1240 | #ifdef EXTENTS_STATS | |
1241 | /* ext4 extents stats */ | |
1242 | unsigned long s_ext_min; | |
1243 | unsigned long s_ext_max; | |
1244 | unsigned long s_depth_max; | |
1245 | spinlock_t s_ext_stats_lock; | |
1246 | unsigned long s_ext_blocks; | |
1247 | unsigned long s_ext_extents; | |
1248 | #endif | |
1249 | ||
1250 | /* for buddy allocator */ | |
1251 | struct ext4_group_info ***s_group_info; | |
1252 | struct inode *s_buddy_cache; | |
1253 | spinlock_t s_md_lock; | |
1254 | unsigned short *s_mb_offsets; | |
1255 | unsigned int *s_mb_maxs; | |
1256 | unsigned int s_group_info_size; | |
1257 | ||
1258 | /* tunables */ | |
1259 | unsigned long s_stripe; | |
1260 | unsigned int s_mb_stream_request; | |
1261 | unsigned int s_mb_max_to_scan; | |
1262 | unsigned int s_mb_min_to_scan; | |
1263 | unsigned int s_mb_stats; | |
1264 | unsigned int s_mb_order2_reqs; | |
1265 | unsigned int s_mb_group_prealloc; | |
1266 | unsigned int s_max_writeback_mb_bump; | |
1267 | unsigned int s_max_dir_size_kb; | |
1268 | /* where last allocation was done - for stream allocation */ | |
1269 | unsigned long s_mb_last_group; | |
1270 | unsigned long s_mb_last_start; | |
1271 | ||
1272 | /* stats for buddy allocator */ | |
1273 | atomic_t s_bal_reqs; /* number of reqs with len > 1 */ | |
1274 | atomic_t s_bal_success; /* we found long enough chunks */ | |
1275 | atomic_t s_bal_allocated; /* in blocks */ | |
1276 | atomic_t s_bal_ex_scanned; /* total extents scanned */ | |
1277 | atomic_t s_bal_goals; /* goal hits */ | |
1278 | atomic_t s_bal_breaks; /* too long searches */ | |
1279 | atomic_t s_bal_2orders; /* 2^order hits */ | |
1280 | spinlock_t s_bal_lock; | |
1281 | unsigned long s_mb_buddies_generated; | |
1282 | unsigned long long s_mb_generation_time; | |
1283 | atomic_t s_mb_lost_chunks; | |
1284 | atomic_t s_mb_preallocated; | |
1285 | atomic_t s_mb_discarded; | |
1286 | atomic_t s_lock_busy; | |
1287 | ||
1288 | /* locality groups */ | |
1289 | struct ext4_locality_group __percpu *s_locality_groups; | |
1290 | ||
1291 | /* for write statistics */ | |
1292 | unsigned long s_sectors_written_start; | |
1293 | u64 s_kbytes_written; | |
1294 | ||
1295 | /* the size of zero-out chunk */ | |
1296 | unsigned int s_extent_max_zeroout_kb; | |
1297 | ||
1298 | unsigned int s_log_groups_per_flex; | |
1299 | struct flex_groups *s_flex_groups; | |
1300 | ext4_group_t s_flex_groups_allocated; | |
1301 | ||
1302 | /* workqueue for dio unwritten */ | |
1303 | struct workqueue_struct *dio_unwritten_wq; | |
1304 | ||
1305 | /* timer for periodic error stats printing */ | |
1306 | struct timer_list s_err_report; | |
1307 | ||
1308 | /* Lazy inode table initialization info */ | |
1309 | struct ext4_li_request *s_li_request; | |
1310 | /* Wait multiplier for lazy initialization thread */ | |
1311 | unsigned int s_li_wait_mult; | |
1312 | ||
1313 | /* Kernel thread for multiple mount protection */ | |
1314 | struct task_struct *s_mmp_tsk; | |
1315 | ||
1316 | /* record the last minlen when FITRIM is called. */ | |
1317 | atomic_t s_last_trim_minblks; | |
1318 | ||
1319 | /* Reference to checksum algorithm driver via cryptoapi */ | |
1320 | struct crypto_shash *s_chksum_driver; | |
1321 | ||
1322 | /* Precomputed FS UUID checksum for seeding other checksums */ | |
1323 | __u32 s_csum_seed; | |
1324 | }; | |
1325 | ||
1326 | static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb) | |
1327 | { | |
1328 | return sb->s_fs_info; | |
1329 | } | |
1330 | static inline struct ext4_inode_info *EXT4_I(struct inode *inode) | |
1331 | { | |
1332 | return container_of(inode, struct ext4_inode_info, vfs_inode); | |
1333 | } | |
1334 | ||
1335 | static inline struct timespec ext4_current_time(struct inode *inode) | |
1336 | { | |
1337 | return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ? | |
1338 | current_fs_time(inode->i_sb) : CURRENT_TIME_SEC; | |
1339 | } | |
1340 | ||
1341 | static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino) | |
1342 | { | |
1343 | return ino == EXT4_ROOT_INO || | |
1344 | ino == EXT4_USR_QUOTA_INO || | |
1345 | ino == EXT4_GRP_QUOTA_INO || | |
1346 | ino == EXT4_JOURNAL_INO || | |
1347 | ino == EXT4_RESIZE_INO || | |
1348 | (ino >= EXT4_FIRST_INO(sb) && | |
1349 | ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count)); | |
1350 | } | |
1351 | ||
1352 | static inline void ext4_set_io_unwritten_flag(struct inode *inode, | |
1353 | struct ext4_io_end *io_end) | |
1354 | { | |
1355 | if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) { | |
1356 | io_end->flag |= EXT4_IO_END_UNWRITTEN; | |
1357 | atomic_inc(&EXT4_I(inode)->i_unwritten); | |
1358 | } | |
1359 | } | |
1360 | ||
1361 | static inline ext4_io_end_t *ext4_inode_aio(struct inode *inode) | |
1362 | { | |
1363 | return inode->i_private; | |
1364 | } | |
1365 | ||
1366 | static inline void ext4_inode_aio_set(struct inode *inode, ext4_io_end_t *io) | |
1367 | { | |
1368 | inode->i_private = io; | |
1369 | } | |
1370 | ||
1371 | /* | |
1372 | * Inode dynamic state flags | |
1373 | */ | |
1374 | enum { | |
1375 | EXT4_STATE_JDATA, /* journaled data exists */ | |
1376 | EXT4_STATE_NEW, /* inode is newly created */ | |
1377 | EXT4_STATE_XATTR, /* has in-inode xattrs */ | |
1378 | EXT4_STATE_NO_EXPAND, /* No space for expansion */ | |
1379 | EXT4_STATE_DA_ALLOC_CLOSE, /* Alloc DA blks on close */ | |
1380 | EXT4_STATE_EXT_MIGRATE, /* Inode is migrating */ | |
1381 | EXT4_STATE_DIO_UNWRITTEN, /* need convert on dio done*/ | |
1382 | EXT4_STATE_NEWENTRY, /* File just added to dir */ | |
1383 | EXT4_STATE_DELALLOC_RESERVED, /* blks already reserved for delalloc */ | |
1384 | EXT4_STATE_DIOREAD_LOCK, /* Disable support for dio read | |
1385 | nolocking */ | |
1386 | EXT4_STATE_MAY_INLINE_DATA, /* may have in-inode data */ | |
1387 | }; | |
1388 | ||
1389 | #define EXT4_INODE_BIT_FNS(name, field, offset) \ | |
1390 | static inline int ext4_test_inode_##name(struct inode *inode, int bit) \ | |
1391 | { \ | |
1392 | return test_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ | |
1393 | } \ | |
1394 | static inline void ext4_set_inode_##name(struct inode *inode, int bit) \ | |
1395 | { \ | |
1396 | set_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ | |
1397 | } \ | |
1398 | static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \ | |
1399 | { \ | |
1400 | clear_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ | |
1401 | } | |
1402 | ||
1403 | EXT4_INODE_BIT_FNS(flag, flags, 0) | |
1404 | #if (BITS_PER_LONG < 64) | |
1405 | EXT4_INODE_BIT_FNS(state, state_flags, 0) | |
1406 | ||
1407 | static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) | |
1408 | { | |
1409 | (ei)->i_state_flags = 0; | |
1410 | } | |
1411 | #else | |
1412 | EXT4_INODE_BIT_FNS(state, flags, 32) | |
1413 | ||
1414 | static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) | |
1415 | { | |
1416 | /* We depend on the fact that callers will set i_flags */ | |
1417 | } | |
1418 | #endif | |
1419 | #else | |
1420 | /* Assume that user mode programs are passing in an ext4fs superblock, not | |
1421 | * a kernel struct super_block. This will allow us to call the feature-test | |
1422 | * macros from user land. */ | |
1423 | #define EXT4_SB(sb) (sb) | |
1424 | #endif | |
1425 | ||
1426 | #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime | |
1427 | ||
1428 | /* | |
1429 | * Codes for operating systems | |
1430 | */ | |
1431 | #define EXT4_OS_LINUX 0 | |
1432 | #define EXT4_OS_HURD 1 | |
1433 | #define EXT4_OS_MASIX 2 | |
1434 | #define EXT4_OS_FREEBSD 3 | |
1435 | #define EXT4_OS_LITES 4 | |
1436 | ||
1437 | /* | |
1438 | * Revision levels | |
1439 | */ | |
1440 | #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */ | |
1441 | #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ | |
1442 | ||
1443 | #define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV | |
1444 | #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV | |
1445 | ||
1446 | #define EXT4_GOOD_OLD_INODE_SIZE 128 | |
1447 | ||
1448 | /* | |
1449 | * Feature set definitions | |
1450 | */ | |
1451 | ||
1452 | #define EXT4_HAS_COMPAT_FEATURE(sb,mask) \ | |
1453 | ((EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask)) != 0) | |
1454 | #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \ | |
1455 | ((EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask)) != 0) | |
1456 | #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \ | |
1457 | ((EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask)) != 0) | |
1458 | #define EXT4_SET_COMPAT_FEATURE(sb,mask) \ | |
1459 | EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask) | |
1460 | #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \ | |
1461 | EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask) | |
1462 | #define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \ | |
1463 | EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask) | |
1464 | #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \ | |
1465 | EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask) | |
1466 | #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \ | |
1467 | EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask) | |
1468 | #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \ | |
1469 | EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask) | |
1470 | ||
1471 | #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001 | |
1472 | #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002 | |
1473 | #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004 | |
1474 | #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008 | |
1475 | #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010 | |
1476 | #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020 | |
1477 | ||
1478 | #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 | |
1479 | #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 | |
1480 | #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 | |
1481 | #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008 | |
1482 | #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010 | |
1483 | #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020 | |
1484 | #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040 | |
1485 | #define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100 | |
1486 | #define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200 | |
1487 | /* | |
1488 | * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM). When | |
1489 | * METADATA_CSUM is set, group descriptor checksums use the same algorithm as | |
1490 | * all other data structures' checksums. However, the METADATA_CSUM and | |
1491 | * GDT_CSUM bits are mutually exclusive. | |
1492 | */ | |
1493 | #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400 | |
1494 | ||
1495 | #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001 | |
1496 | #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002 | |
1497 | #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */ | |
1498 | #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */ | |
1499 | #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010 | |
1500 | #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */ | |
1501 | #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080 | |
1502 | #define EXT4_FEATURE_INCOMPAT_MMP 0x0100 | |
1503 | #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200 | |
1504 | #define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 /* EA in inode */ | |
1505 | #define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 /* data in dirent */ | |
1506 | #define EXT4_FEATURE_INCOMPAT_BG_USE_META_CSUM 0x2000 /* use crc32c for bg */ | |
1507 | #define EXT4_FEATURE_INCOMPAT_LARGEDIR 0x4000 /* >2GB or 3-lvl htree */ | |
1508 | #define EXT4_FEATURE_INCOMPAT_INLINE_DATA 0x8000 /* data in inode */ | |
1509 | ||
1510 | #define EXT2_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR | |
1511 | #define EXT2_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ | |
1512 | EXT4_FEATURE_INCOMPAT_META_BG) | |
1513 | #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ | |
1514 | EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ | |
1515 | EXT4_FEATURE_RO_COMPAT_BTREE_DIR) | |
1516 | ||
1517 | #define EXT3_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR | |
1518 | #define EXT3_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ | |
1519 | EXT4_FEATURE_INCOMPAT_RECOVER| \ | |
1520 | EXT4_FEATURE_INCOMPAT_META_BG) | |
1521 | #define EXT3_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ | |
1522 | EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ | |
1523 | EXT4_FEATURE_RO_COMPAT_BTREE_DIR) | |
1524 | ||
1525 | #define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR | |
1526 | #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ | |
1527 | EXT4_FEATURE_INCOMPAT_RECOVER| \ | |
1528 | EXT4_FEATURE_INCOMPAT_META_BG| \ | |
1529 | EXT4_FEATURE_INCOMPAT_EXTENTS| \ | |
1530 | EXT4_FEATURE_INCOMPAT_64BIT| \ | |
1531 | EXT4_FEATURE_INCOMPAT_FLEX_BG| \ | |
1532 | EXT4_FEATURE_INCOMPAT_MMP) | |
1533 | #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ | |
1534 | EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ | |
1535 | EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \ | |
1536 | EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \ | |
1537 | EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \ | |
1538 | EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\ | |
1539 | EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\ | |
1540 | EXT4_FEATURE_RO_COMPAT_BIGALLOC |\ | |
1541 | EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\ | |
1542 | EXT4_FEATURE_RO_COMPAT_QUOTA) | |
1543 | ||
1544 | /* | |
1545 | * Default values for user and/or group using reserved blocks | |
1546 | */ | |
1547 | #define EXT4_DEF_RESUID 0 | |
1548 | #define EXT4_DEF_RESGID 0 | |
1549 | ||
1550 | #define EXT4_DEF_INODE_READAHEAD_BLKS 32 | |
1551 | ||
1552 | /* | |
1553 | * Default mount options | |
1554 | */ | |
1555 | #define EXT4_DEFM_DEBUG 0x0001 | |
1556 | #define EXT4_DEFM_BSDGROUPS 0x0002 | |
1557 | #define EXT4_DEFM_XATTR_USER 0x0004 | |
1558 | #define EXT4_DEFM_ACL 0x0008 | |
1559 | #define EXT4_DEFM_UID16 0x0010 | |
1560 | #define EXT4_DEFM_JMODE 0x0060 | |
1561 | #define EXT4_DEFM_JMODE_DATA 0x0020 | |
1562 | #define EXT4_DEFM_JMODE_ORDERED 0x0040 | |
1563 | #define EXT4_DEFM_JMODE_WBACK 0x0060 | |
1564 | #define EXT4_DEFM_NOBARRIER 0x0100 | |
1565 | #define EXT4_DEFM_BLOCK_VALIDITY 0x0200 | |
1566 | #define EXT4_DEFM_DISCARD 0x0400 | |
1567 | #define EXT4_DEFM_NODELALLOC 0x0800 | |
1568 | ||
1569 | /* | |
1570 | * Default journal batch times | |
1571 | */ | |
1572 | #define EXT4_DEF_MIN_BATCH_TIME 0 | |
1573 | #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */ | |
1574 | ||
1575 | /* | |
1576 | * Minimum number of groups in a flexgroup before we separate out | |
1577 | * directories into the first block group of a flexgroup | |
1578 | */ | |
1579 | #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4 | |
1580 | ||
1581 | /* | |
1582 | * Structure of a directory entry | |
1583 | */ | |
1584 | #define EXT4_NAME_LEN 255 | |
1585 | ||
1586 | struct ext4_dir_entry { | |
1587 | __le32 inode; /* Inode number */ | |
1588 | __le16 rec_len; /* Directory entry length */ | |
1589 | __le16 name_len; /* Name length */ | |
1590 | char name[EXT4_NAME_LEN]; /* File name */ | |
1591 | }; | |
1592 | ||
1593 | /* | |
1594 | * The new version of the directory entry. Since EXT4 structures are | |
1595 | * stored in intel byte order, and the name_len field could never be | |
1596 | * bigger than 255 chars, it's safe to reclaim the extra byte for the | |
1597 | * file_type field. | |
1598 | */ | |
1599 | struct ext4_dir_entry_2 { | |
1600 | __le32 inode; /* Inode number */ | |
1601 | __le16 rec_len; /* Directory entry length */ | |
1602 | __u8 name_len; /* Name length */ | |
1603 | __u8 file_type; | |
1604 | char name[EXT4_NAME_LEN]; /* File name */ | |
1605 | }; | |
1606 | ||
1607 | /* | |
1608 | * This is a bogus directory entry at the end of each leaf block that | |
1609 | * records checksums. | |
1610 | */ | |
1611 | struct ext4_dir_entry_tail { | |
1612 | __le32 det_reserved_zero1; /* Pretend to be unused */ | |
1613 | __le16 det_rec_len; /* 12 */ | |
1614 | __u8 det_reserved_zero2; /* Zero name length */ | |
1615 | __u8 det_reserved_ft; /* 0xDE, fake file type */ | |
1616 | __le32 det_checksum; /* crc32c(uuid+inum+dirblock) */ | |
1617 | }; | |
1618 | ||
1619 | /* | |
1620 | * Ext4 directory file types. Only the low 3 bits are used. The | |
1621 | * other bits are reserved for now. | |
1622 | */ | |
1623 | #define EXT4_FT_UNKNOWN 0 | |
1624 | #define EXT4_FT_REG_FILE 1 | |
1625 | #define EXT4_FT_DIR 2 | |
1626 | #define EXT4_FT_CHRDEV 3 | |
1627 | #define EXT4_FT_BLKDEV 4 | |
1628 | #define EXT4_FT_FIFO 5 | |
1629 | #define EXT4_FT_SOCK 6 | |
1630 | #define EXT4_FT_SYMLINK 7 | |
1631 | ||
1632 | #define EXT4_FT_MAX 8 | |
1633 | ||
1634 | #define EXT4_FT_DIR_CSUM 0xDE | |
1635 | ||
1636 | /* | |
1637 | * EXT4_DIR_PAD defines the directory entries boundaries | |
1638 | * | |
1639 | * NOTE: It must be a multiple of 4 | |
1640 | */ | |
1641 | #define EXT4_DIR_PAD 4 | |
1642 | #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1) | |
1643 | #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \ | |
1644 | ~EXT4_DIR_ROUND) | |
1645 | #define EXT4_MAX_REC_LEN ((1<<16)-1) | |
1646 | ||
1647 | /* | |
1648 | * If we ever get support for fs block sizes > page_size, we'll need | |
1649 | * to remove the #if statements in the next two functions... | |
1650 | */ | |
1651 | static inline unsigned int | |
1652 | ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize) | |
1653 | { | |
1654 | unsigned len = le16_to_cpu(dlen); | |
1655 | ||
1656 | #if (PAGE_CACHE_SIZE >= 65536) | |
1657 | if (len == EXT4_MAX_REC_LEN || len == 0) | |
1658 | return blocksize; | |
1659 | return (len & 65532) | ((len & 3) << 16); | |
1660 | #else | |
1661 | return len; | |
1662 | #endif | |
1663 | } | |
1664 | ||
1665 | static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize) | |
1666 | { | |
1667 | if ((len > blocksize) || (blocksize > (1 << 18)) || (len & 3)) | |
1668 | BUG(); | |
1669 | #if (PAGE_CACHE_SIZE >= 65536) | |
1670 | if (len < 65536) | |
1671 | return cpu_to_le16(len); | |
1672 | if (len == blocksize) { | |
1673 | if (blocksize == 65536) | |
1674 | return cpu_to_le16(EXT4_MAX_REC_LEN); | |
1675 | else | |
1676 | return cpu_to_le16(0); | |
1677 | } | |
1678 | return cpu_to_le16((len & 65532) | ((len >> 16) & 3)); | |
1679 | #else | |
1680 | return cpu_to_le16(len); | |
1681 | #endif | |
1682 | } | |
1683 | ||
1684 | /* | |
1685 | * Hash Tree Directory indexing | |
1686 | * (c) Daniel Phillips, 2001 | |
1687 | */ | |
1688 | ||
1689 | #define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \ | |
1690 | EXT4_FEATURE_COMPAT_DIR_INDEX) && \ | |
1691 | ext4_test_inode_flag((dir), EXT4_INODE_INDEX)) | |
1692 | #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX) | |
1693 | #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1) | |
1694 | ||
1695 | /* Legal values for the dx_root hash_version field: */ | |
1696 | ||
1697 | #define DX_HASH_LEGACY 0 | |
1698 | #define DX_HASH_HALF_MD4 1 | |
1699 | #define DX_HASH_TEA 2 | |
1700 | #define DX_HASH_LEGACY_UNSIGNED 3 | |
1701 | #define DX_HASH_HALF_MD4_UNSIGNED 4 | |
1702 | #define DX_HASH_TEA_UNSIGNED 5 | |
1703 | ||
1704 | static inline u32 ext4_chksum(struct ext4_sb_info *sbi, u32 crc, | |
1705 | const void *address, unsigned int length) | |
1706 | { | |
1707 | struct { | |
1708 | struct shash_desc shash; | |
1709 | char ctx[4]; | |
1710 | } desc; | |
1711 | int err; | |
1712 | ||
1713 | BUG_ON(crypto_shash_descsize(sbi->s_chksum_driver)!=sizeof(desc.ctx)); | |
1714 | ||
1715 | desc.shash.tfm = sbi->s_chksum_driver; | |
1716 | desc.shash.flags = 0; | |
1717 | *(u32 *)desc.ctx = crc; | |
1718 | ||
1719 | err = crypto_shash_update(&desc.shash, address, length); | |
1720 | BUG_ON(err); | |
1721 | ||
1722 | return *(u32 *)desc.ctx; | |
1723 | } | |
1724 | ||
1725 | #ifdef __KERNEL__ | |
1726 | ||
1727 | /* hash info structure used by the directory hash */ | |
1728 | struct dx_hash_info | |
1729 | { | |
1730 | u32 hash; | |
1731 | u32 minor_hash; | |
1732 | int hash_version; | |
1733 | u32 *seed; | |
1734 | }; | |
1735 | ||
1736 | ||
1737 | /* 32 and 64 bit signed EOF for dx directories */ | |
1738 | #define EXT4_HTREE_EOF_32BIT ((1UL << (32 - 1)) - 1) | |
1739 | #define EXT4_HTREE_EOF_64BIT ((1ULL << (64 - 1)) - 1) | |
1740 | ||
1741 | ||
1742 | /* | |
1743 | * Control parameters used by ext4_htree_next_block | |
1744 | */ | |
1745 | #define HASH_NB_ALWAYS 1 | |
1746 | ||
1747 | ||
1748 | /* | |
1749 | * Describe an inode's exact location on disk and in memory | |
1750 | */ | |
1751 | struct ext4_iloc | |
1752 | { | |
1753 | struct buffer_head *bh; | |
1754 | unsigned long offset; | |
1755 | ext4_group_t block_group; | |
1756 | }; | |
1757 | ||
1758 | static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc) | |
1759 | { | |
1760 | return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset); | |
1761 | } | |
1762 | ||
1763 | /* | |
1764 | * This structure is stuffed into the struct file's private_data field | |
1765 | * for directories. It is where we put information so that we can do | |
1766 | * readdir operations in hash tree order. | |
1767 | */ | |
1768 | struct dir_private_info { | |
1769 | struct rb_root root; | |
1770 | struct rb_node *curr_node; | |
1771 | struct fname *extra_fname; | |
1772 | loff_t last_pos; | |
1773 | __u32 curr_hash; | |
1774 | __u32 curr_minor_hash; | |
1775 | __u32 next_hash; | |
1776 | }; | |
1777 | ||
1778 | /* calculate the first block number of the group */ | |
1779 | static inline ext4_fsblk_t | |
1780 | ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no) | |
1781 | { | |
1782 | return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) + | |
1783 | le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block); | |
1784 | } | |
1785 | ||
1786 | /* | |
1787 | * Special error return code only used by dx_probe() and its callers. | |
1788 | */ | |
1789 | #define ERR_BAD_DX_DIR -75000 | |
1790 | ||
1791 | void ext4_get_group_no_and_offset(struct super_block *sb, ext4_fsblk_t blocknr, | |
1792 | ext4_group_t *blockgrpp, ext4_grpblk_t *offsetp); | |
1793 | ||
1794 | /* | |
1795 | * Timeout and state flag for lazy initialization inode thread. | |
1796 | */ | |
1797 | #define EXT4_DEF_LI_WAIT_MULT 10 | |
1798 | #define EXT4_DEF_LI_MAX_START_DELAY 5 | |
1799 | #define EXT4_LAZYINIT_QUIT 0x0001 | |
1800 | #define EXT4_LAZYINIT_RUNNING 0x0002 | |
1801 | ||
1802 | /* | |
1803 | * Lazy inode table initialization info | |
1804 | */ | |
1805 | struct ext4_lazy_init { | |
1806 | unsigned long li_state; | |
1807 | struct list_head li_request_list; | |
1808 | struct mutex li_list_mtx; | |
1809 | }; | |
1810 | ||
1811 | struct ext4_li_request { | |
1812 | struct super_block *lr_super; | |
1813 | struct ext4_sb_info *lr_sbi; | |
1814 | ext4_group_t lr_next_group; | |
1815 | struct list_head lr_request; | |
1816 | unsigned long lr_next_sched; | |
1817 | unsigned long lr_timeout; | |
1818 | }; | |
1819 | ||
1820 | struct ext4_features { | |
1821 | struct kobject f_kobj; | |
1822 | struct completion f_kobj_unregister; | |
1823 | }; | |
1824 | ||
1825 | /* | |
1826 | * This structure will be used for multiple mount protection. It will be | |
1827 | * written into the block number saved in the s_mmp_block field in the | |
1828 | * superblock. Programs that check MMP should assume that if | |
1829 | * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe | |
1830 | * to use the filesystem, regardless of how old the timestamp is. | |
1831 | */ | |
1832 | #define EXT4_MMP_MAGIC 0x004D4D50U /* ASCII for MMP */ | |
1833 | #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */ | |
1834 | #define EXT4_MMP_SEQ_FSCK 0xE24D4D50U /* mmp_seq value when being fscked */ | |
1835 | #define EXT4_MMP_SEQ_MAX 0xE24D4D4FU /* maximum valid mmp_seq value */ | |
1836 | ||
1837 | struct mmp_struct { | |
1838 | __le32 mmp_magic; /* Magic number for MMP */ | |
1839 | __le32 mmp_seq; /* Sequence no. updated periodically */ | |
1840 | ||
1841 | /* | |
1842 | * mmp_time, mmp_nodename & mmp_bdevname are only used for information | |
1843 | * purposes and do not affect the correctness of the algorithm | |
1844 | */ | |
1845 | __le64 mmp_time; /* Time last updated */ | |
1846 | char mmp_nodename[64]; /* Node which last updated MMP block */ | |
1847 | char mmp_bdevname[32]; /* Bdev which last updated MMP block */ | |
1848 | ||
1849 | /* | |
1850 | * mmp_check_interval is used to verify if the MMP block has been | |
1851 | * updated on the block device. The value is updated based on the | |
1852 | * maximum time to write the MMP block during an update cycle. | |
1853 | */ | |
1854 | __le16 mmp_check_interval; | |
1855 | ||
1856 | __le16 mmp_pad1; | |
1857 | __le32 mmp_pad2[226]; | |
1858 | __le32 mmp_checksum; /* crc32c(uuid+mmp_block) */ | |
1859 | }; | |
1860 | ||
1861 | /* arguments passed to the mmp thread */ | |
1862 | struct mmpd_data { | |
1863 | struct buffer_head *bh; /* bh from initial read_mmp_block() */ | |
1864 | struct super_block *sb; /* super block of the fs */ | |
1865 | }; | |
1866 | ||
1867 | /* | |
1868 | * Check interval multiplier | |
1869 | * The MMP block is written every update interval and initially checked every | |
1870 | * update interval x the multiplier (the value is then adapted based on the | |
1871 | * write latency). The reason is that writes can be delayed under load and we | |
1872 | * don't want readers to incorrectly assume that the filesystem is no longer | |
1873 | * in use. | |
1874 | */ | |
1875 | #define EXT4_MMP_CHECK_MULT 2UL | |
1876 | ||
1877 | /* | |
1878 | * Minimum interval for MMP checking in seconds. | |
1879 | */ | |
1880 | #define EXT4_MMP_MIN_CHECK_INTERVAL 5UL | |
1881 | ||
1882 | /* | |
1883 | * Maximum interval for MMP checking in seconds. | |
1884 | */ | |
1885 | #define EXT4_MMP_MAX_CHECK_INTERVAL 300UL | |
1886 | ||
1887 | /* | |
1888 | * Function prototypes | |
1889 | */ | |
1890 | ||
1891 | /* | |
1892 | * Ok, these declarations are also in <linux/kernel.h> but none of the | |
1893 | * ext4 source programs needs to include it so they are duplicated here. | |
1894 | */ | |
1895 | # define NORET_TYPE /**/ | |
1896 | # define ATTRIB_NORET __attribute__((noreturn)) | |
1897 | # define NORET_AND noreturn, | |
1898 | ||
1899 | /* bitmap.c */ | |
1900 | extern unsigned int ext4_count_free(char *bitmap, unsigned numchars); | |
1901 | void ext4_inode_bitmap_csum_set(struct super_block *sb, ext4_group_t group, | |
1902 | struct ext4_group_desc *gdp, | |
1903 | struct buffer_head *bh, int sz); | |
1904 | int ext4_inode_bitmap_csum_verify(struct super_block *sb, ext4_group_t group, | |
1905 | struct ext4_group_desc *gdp, | |
1906 | struct buffer_head *bh, int sz); | |
1907 | void ext4_block_bitmap_csum_set(struct super_block *sb, ext4_group_t group, | |
1908 | struct ext4_group_desc *gdp, | |
1909 | struct buffer_head *bh); | |
1910 | int ext4_block_bitmap_csum_verify(struct super_block *sb, ext4_group_t group, | |
1911 | struct ext4_group_desc *gdp, | |
1912 | struct buffer_head *bh); | |
1913 | ||
1914 | /* balloc.c */ | |
1915 | extern void ext4_validate_block_bitmap(struct super_block *sb, | |
1916 | struct ext4_group_desc *desc, | |
1917 | unsigned int block_group, | |
1918 | struct buffer_head *bh); | |
1919 | extern unsigned int ext4_block_group(struct super_block *sb, | |
1920 | ext4_fsblk_t blocknr); | |
1921 | extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb, | |
1922 | ext4_fsblk_t blocknr); | |
1923 | extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group); | |
1924 | extern unsigned long ext4_bg_num_gdb(struct super_block *sb, | |
1925 | ext4_group_t group); | |
1926 | extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode, | |
1927 | ext4_fsblk_t goal, | |
1928 | unsigned int flags, | |
1929 | unsigned long *count, | |
1930 | int *errp); | |
1931 | extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi, | |
1932 | s64 nclusters, unsigned int flags); | |
1933 | extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *); | |
1934 | extern void ext4_check_blocks_bitmap(struct super_block *); | |
1935 | extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb, | |
1936 | ext4_group_t block_group, | |
1937 | struct buffer_head ** bh); | |
1938 | extern int ext4_should_retry_alloc(struct super_block *sb, int *retries); | |
1939 | ||
1940 | extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb, | |
1941 | ext4_group_t block_group); | |
1942 | extern int ext4_wait_block_bitmap(struct super_block *sb, | |
1943 | ext4_group_t block_group, | |
1944 | struct buffer_head *bh); | |
1945 | extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb, | |
1946 | ext4_group_t block_group); | |
1947 | extern void ext4_init_block_bitmap(struct super_block *sb, | |
1948 | struct buffer_head *bh, | |
1949 | ext4_group_t group, | |
1950 | struct ext4_group_desc *desc); | |
1951 | extern unsigned ext4_free_clusters_after_init(struct super_block *sb, | |
1952 | ext4_group_t block_group, | |
1953 | struct ext4_group_desc *gdp); | |
1954 | extern unsigned ext4_num_overhead_clusters(struct super_block *sb, | |
1955 | ext4_group_t block_group, | |
1956 | struct ext4_group_desc *gdp); | |
1957 | ext4_fsblk_t ext4_inode_to_goal_block(struct inode *); | |
1958 | ||
1959 | /* dir.c */ | |
1960 | extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *, | |
1961 | struct file *, | |
1962 | struct ext4_dir_entry_2 *, | |
1963 | struct buffer_head *, char *, int, | |
1964 | unsigned int); | |
1965 | #define ext4_check_dir_entry(dir, filp, de, bh, buf, size, offset) \ | |
1966 | unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \ | |
1967 | (de), (bh), (buf), (size), (offset))) | |
1968 | extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash, | |
1969 | __u32 minor_hash, | |
1970 | struct ext4_dir_entry_2 *dirent); | |
1971 | extern void ext4_htree_free_dir_info(struct dir_private_info *p); | |
1972 | extern int ext4_find_dest_de(struct inode *dir, struct inode *inode, | |
1973 | struct buffer_head *bh, | |
1974 | void *buf, int buf_size, | |
1975 | const char *name, int namelen, | |
1976 | struct ext4_dir_entry_2 **dest_de); | |
1977 | void ext4_insert_dentry(struct inode *inode, | |
1978 | struct ext4_dir_entry_2 *de, | |
1979 | int buf_size, | |
1980 | const char *name, int namelen); | |
1981 | static inline void ext4_update_dx_flag(struct inode *inode) | |
1982 | { | |
1983 | if (!EXT4_HAS_COMPAT_FEATURE(inode->i_sb, | |
1984 | EXT4_FEATURE_COMPAT_DIR_INDEX)) | |
1985 | ext4_clear_inode_flag(inode, EXT4_INODE_INDEX); | |
1986 | } | |
1987 | ||
1988 | /* fsync.c */ | |
1989 | extern int ext4_sync_file(struct file *, loff_t, loff_t, int); | |
1990 | extern int ext4_flush_unwritten_io(struct inode *); | |
1991 | ||
1992 | /* hash.c */ | |
1993 | extern int ext4fs_dirhash(const char *name, int len, struct | |
1994 | dx_hash_info *hinfo); | |
1995 | ||
1996 | /* ialloc.c */ | |
1997 | extern struct inode *ext4_new_inode(handle_t *, struct inode *, umode_t, | |
1998 | const struct qstr *qstr, __u32 goal, | |
1999 | uid_t *owner); | |
2000 | extern void ext4_free_inode(handle_t *, struct inode *); | |
2001 | extern struct inode * ext4_orphan_get(struct super_block *, unsigned long); | |
2002 | extern unsigned long ext4_count_free_inodes(struct super_block *); | |
2003 | extern unsigned long ext4_count_dirs(struct super_block *); | |
2004 | extern void ext4_check_inodes_bitmap(struct super_block *); | |
2005 | extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap); | |
2006 | extern int ext4_init_inode_table(struct super_block *sb, | |
2007 | ext4_group_t group, int barrier); | |
2008 | extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate); | |
2009 | ||
2010 | /* mballoc.c */ | |
2011 | extern long ext4_mb_stats; | |
2012 | extern long ext4_mb_max_to_scan; | |
2013 | extern int ext4_mb_init(struct super_block *); | |
2014 | extern int ext4_mb_release(struct super_block *); | |
2015 | extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *, | |
2016 | struct ext4_allocation_request *, int *); | |
2017 | extern int ext4_mb_reserve_blocks(struct super_block *, int); | |
2018 | extern void ext4_discard_preallocations(struct inode *); | |
2019 | extern int __init ext4_init_mballoc(void); | |
2020 | extern void ext4_exit_mballoc(void); | |
2021 | extern void ext4_free_blocks(handle_t *handle, struct inode *inode, | |
2022 | struct buffer_head *bh, ext4_fsblk_t block, | |
2023 | unsigned long count, int flags); | |
2024 | extern int ext4_mb_alloc_groupinfo(struct super_block *sb, | |
2025 | ext4_group_t ngroups); | |
2026 | extern int ext4_mb_add_groupinfo(struct super_block *sb, | |
2027 | ext4_group_t i, struct ext4_group_desc *desc); | |
2028 | extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb, | |
2029 | ext4_fsblk_t block, unsigned long count); | |
2030 | extern int ext4_trim_fs(struct super_block *, struct fstrim_range *); | |
2031 | ||
2032 | /* inode.c */ | |
2033 | struct buffer_head *ext4_getblk(handle_t *, struct inode *, | |
2034 | ext4_lblk_t, int, int *); | |
2035 | struct buffer_head *ext4_bread(handle_t *, struct inode *, | |
2036 | ext4_lblk_t, int, int *); | |
2037 | int ext4_get_block_write(struct inode *inode, sector_t iblock, | |
2038 | struct buffer_head *bh_result, int create); | |
2039 | int ext4_get_block(struct inode *inode, sector_t iblock, | |
2040 | struct buffer_head *bh_result, int create); | |
2041 | int ext4_da_get_block_prep(struct inode *inode, sector_t iblock, | |
2042 | struct buffer_head *bh, int create); | |
2043 | int ext4_walk_page_buffers(handle_t *handle, | |
2044 | struct buffer_head *head, | |
2045 | unsigned from, | |
2046 | unsigned to, | |
2047 | int *partial, | |
2048 | int (*fn)(handle_t *handle, | |
2049 | struct buffer_head *bh)); | |
2050 | int do_journal_get_write_access(handle_t *handle, | |
2051 | struct buffer_head *bh); | |
2052 | #define FALL_BACK_TO_NONDELALLOC 1 | |
2053 | #define CONVERT_INLINE_DATA 2 | |
2054 | ||
2055 | extern struct inode *ext4_iget(struct super_block *, unsigned long); | |
2056 | extern int ext4_write_inode(struct inode *, struct writeback_control *); | |
2057 | extern int ext4_setattr(struct dentry *, struct iattr *); | |
2058 | extern int ext4_getattr(struct vfsmount *mnt, struct dentry *dentry, | |
2059 | struct kstat *stat); | |
2060 | extern void ext4_evict_inode(struct inode *); | |
2061 | extern void ext4_clear_inode(struct inode *); | |
2062 | extern int ext4_sync_inode(handle_t *, struct inode *); | |
2063 | extern void ext4_dirty_inode(struct inode *, int); | |
2064 | extern int ext4_change_inode_journal_flag(struct inode *, int); | |
2065 | extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *); | |
2066 | extern int ext4_can_truncate(struct inode *inode); | |
2067 | extern void ext4_truncate(struct inode *); | |
2068 | extern int ext4_punch_hole(struct file *file, loff_t offset, loff_t length); | |
2069 | extern int ext4_truncate_restart_trans(handle_t *, struct inode *, int nblocks); | |
2070 | extern void ext4_set_inode_flags(struct inode *); | |
2071 | extern void ext4_get_inode_flags(struct ext4_inode_info *); | |
2072 | extern int ext4_alloc_da_blocks(struct inode *inode); | |
2073 | extern void ext4_set_aops(struct inode *inode); | |
2074 | extern int ext4_writepage_trans_blocks(struct inode *); | |
2075 | extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks); | |
2076 | extern int ext4_discard_partial_page_buffers(handle_t *handle, | |
2077 | struct address_space *mapping, loff_t from, | |
2078 | loff_t length, int flags); | |
2079 | extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf); | |
2080 | extern qsize_t *ext4_get_reserved_space(struct inode *inode); | |
2081 | extern void ext4_da_update_reserve_space(struct inode *inode, | |
2082 | int used, int quota_claim); | |
2083 | ||
2084 | /* indirect.c */ | |
2085 | extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode, | |
2086 | struct ext4_map_blocks *map, int flags); | |
2087 | extern ssize_t ext4_ind_direct_IO(int rw, struct kiocb *iocb, | |
2088 | const struct iovec *iov, loff_t offset, | |
2089 | unsigned long nr_segs); | |
2090 | extern int ext4_ind_calc_metadata_amount(struct inode *inode, sector_t lblock); | |
2091 | extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks, int chunk); | |
2092 | extern void ext4_ind_truncate(struct inode *inode); | |
2093 | ||
2094 | /* ioctl.c */ | |
2095 | extern long ext4_ioctl(struct file *, unsigned int, unsigned long); | |
2096 | extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long); | |
2097 | ||
2098 | /* migrate.c */ | |
2099 | extern int ext4_ext_migrate(struct inode *); | |
2100 | ||
2101 | /* namei.c */ | |
2102 | extern int ext4_dirent_csum_verify(struct inode *inode, | |
2103 | struct ext4_dir_entry *dirent); | |
2104 | extern int ext4_orphan_add(handle_t *, struct inode *); | |
2105 | extern int ext4_orphan_del(handle_t *, struct inode *); | |
2106 | extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash, | |
2107 | __u32 start_minor_hash, __u32 *next_hash); | |
2108 | ||
2109 | /* resize.c */ | |
2110 | extern int ext4_group_add(struct super_block *sb, | |
2111 | struct ext4_new_group_data *input); | |
2112 | extern int ext4_group_extend(struct super_block *sb, | |
2113 | struct ext4_super_block *es, | |
2114 | ext4_fsblk_t n_blocks_count); | |
2115 | extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count); | |
2116 | ||
2117 | /* super.c */ | |
2118 | extern int ext4_calculate_overhead(struct super_block *sb); | |
2119 | extern int ext4_superblock_csum_verify(struct super_block *sb, | |
2120 | struct ext4_super_block *es); | |
2121 | extern void ext4_superblock_csum_set(struct super_block *sb); | |
2122 | extern void *ext4_kvmalloc(size_t size, gfp_t flags); | |
2123 | extern void *ext4_kvzalloc(size_t size, gfp_t flags); | |
2124 | extern void ext4_kvfree(void *ptr); | |
2125 | extern int ext4_alloc_flex_bg_array(struct super_block *sb, | |
2126 | ext4_group_t ngroup); | |
2127 | extern __printf(4, 5) | |
2128 | void __ext4_error(struct super_block *, const char *, unsigned int, | |
2129 | const char *, ...); | |
2130 | #define ext4_error(sb, message...) __ext4_error(sb, __func__, \ | |
2131 | __LINE__, ## message) | |
2132 | extern __printf(5, 6) | |
2133 | void ext4_error_inode(struct inode *, const char *, unsigned int, ext4_fsblk_t, | |
2134 | const char *, ...); | |
2135 | extern __printf(5, 6) | |
2136 | void ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t, | |
2137 | const char *, ...); | |
2138 | extern void __ext4_std_error(struct super_block *, const char *, | |
2139 | unsigned int, int); | |
2140 | extern __printf(4, 5) | |
2141 | void __ext4_abort(struct super_block *, const char *, unsigned int, | |
2142 | const char *, ...); | |
2143 | #define ext4_abort(sb, message...) __ext4_abort(sb, __func__, \ | |
2144 | __LINE__, ## message) | |
2145 | extern __printf(4, 5) | |
2146 | void __ext4_warning(struct super_block *, const char *, unsigned int, | |
2147 | const char *, ...); | |
2148 | #define ext4_warning(sb, message...) __ext4_warning(sb, __func__, \ | |
2149 | __LINE__, ## message) | |
2150 | extern __printf(3, 4) | |
2151 | void ext4_msg(struct super_block *, const char *, const char *, ...); | |
2152 | extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp, | |
2153 | const char *, unsigned int, const char *); | |
2154 | #define dump_mmp_msg(sb, mmp, msg) __dump_mmp_msg(sb, mmp, __func__, \ | |
2155 | __LINE__, msg) | |
2156 | extern __printf(7, 8) | |
2157 | void __ext4_grp_locked_error(const char *, unsigned int, | |
2158 | struct super_block *, ext4_group_t, | |
2159 | unsigned long, ext4_fsblk_t, | |
2160 | const char *, ...); | |
2161 | #define ext4_grp_locked_error(sb, grp, message...) \ | |
2162 | __ext4_grp_locked_error(__func__, __LINE__, (sb), (grp), ## message) | |
2163 | extern void ext4_update_dynamic_rev(struct super_block *sb); | |
2164 | extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb, | |
2165 | __u32 compat); | |
2166 | extern int ext4_update_rocompat_feature(handle_t *handle, | |
2167 | struct super_block *sb, __u32 rocompat); | |
2168 | extern int ext4_update_incompat_feature(handle_t *handle, | |
2169 | struct super_block *sb, __u32 incompat); | |
2170 | extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb, | |
2171 | struct ext4_group_desc *bg); | |
2172 | extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb, | |
2173 | struct ext4_group_desc *bg); | |
2174 | extern ext4_fsblk_t ext4_inode_table(struct super_block *sb, | |
2175 | struct ext4_group_desc *bg); | |
2176 | extern __u32 ext4_free_group_clusters(struct super_block *sb, | |
2177 | struct ext4_group_desc *bg); | |
2178 | extern __u32 ext4_free_inodes_count(struct super_block *sb, | |
2179 | struct ext4_group_desc *bg); | |
2180 | extern __u32 ext4_used_dirs_count(struct super_block *sb, | |
2181 | struct ext4_group_desc *bg); | |
2182 | extern __u32 ext4_itable_unused_count(struct super_block *sb, | |
2183 | struct ext4_group_desc *bg); | |
2184 | extern void ext4_block_bitmap_set(struct super_block *sb, | |
2185 | struct ext4_group_desc *bg, ext4_fsblk_t blk); | |
2186 | extern void ext4_inode_bitmap_set(struct super_block *sb, | |
2187 | struct ext4_group_desc *bg, ext4_fsblk_t blk); | |
2188 | extern void ext4_inode_table_set(struct super_block *sb, | |
2189 | struct ext4_group_desc *bg, ext4_fsblk_t blk); | |
2190 | extern void ext4_free_group_clusters_set(struct super_block *sb, | |
2191 | struct ext4_group_desc *bg, | |
2192 | __u32 count); | |
2193 | extern void ext4_free_inodes_set(struct super_block *sb, | |
2194 | struct ext4_group_desc *bg, __u32 count); | |
2195 | extern void ext4_used_dirs_set(struct super_block *sb, | |
2196 | struct ext4_group_desc *bg, __u32 count); | |
2197 | extern void ext4_itable_unused_set(struct super_block *sb, | |
2198 | struct ext4_group_desc *bg, __u32 count); | |
2199 | extern int ext4_group_desc_csum_verify(struct super_block *sb, __u32 group, | |
2200 | struct ext4_group_desc *gdp); | |
2201 | extern void ext4_group_desc_csum_set(struct super_block *sb, __u32 group, | |
2202 | struct ext4_group_desc *gdp); | |
2203 | ||
2204 | static inline int ext4_has_group_desc_csum(struct super_block *sb) | |
2205 | { | |
2206 | return EXT4_HAS_RO_COMPAT_FEATURE(sb, | |
2207 | EXT4_FEATURE_RO_COMPAT_GDT_CSUM | | |
2208 | EXT4_FEATURE_RO_COMPAT_METADATA_CSUM); | |
2209 | } | |
2210 | ||
2211 | static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es) | |
2212 | { | |
2213 | return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) | | |
2214 | le32_to_cpu(es->s_blocks_count_lo); | |
2215 | } | |
2216 | ||
2217 | static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es) | |
2218 | { | |
2219 | return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) | | |
2220 | le32_to_cpu(es->s_r_blocks_count_lo); | |
2221 | } | |
2222 | ||
2223 | static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es) | |
2224 | { | |
2225 | return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) | | |
2226 | le32_to_cpu(es->s_free_blocks_count_lo); | |
2227 | } | |
2228 | ||
2229 | static inline void ext4_blocks_count_set(struct ext4_super_block *es, | |
2230 | ext4_fsblk_t blk) | |
2231 | { | |
2232 | es->s_blocks_count_lo = cpu_to_le32((u32)blk); | |
2233 | es->s_blocks_count_hi = cpu_to_le32(blk >> 32); | |
2234 | } | |
2235 | ||
2236 | static inline void ext4_free_blocks_count_set(struct ext4_super_block *es, | |
2237 | ext4_fsblk_t blk) | |
2238 | { | |
2239 | es->s_free_blocks_count_lo = cpu_to_le32((u32)blk); | |
2240 | es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32); | |
2241 | } | |
2242 | ||
2243 | static inline void ext4_r_blocks_count_set(struct ext4_super_block *es, | |
2244 | ext4_fsblk_t blk) | |
2245 | { | |
2246 | es->s_r_blocks_count_lo = cpu_to_le32((u32)blk); | |
2247 | es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32); | |
2248 | } | |
2249 | ||
2250 | static inline loff_t ext4_isize(struct ext4_inode *raw_inode) | |
2251 | { | |
2252 | if (S_ISREG(le16_to_cpu(raw_inode->i_mode))) | |
2253 | return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) | | |
2254 | le32_to_cpu(raw_inode->i_size_lo); | |
2255 | else | |
2256 | return (loff_t) le32_to_cpu(raw_inode->i_size_lo); | |
2257 | } | |
2258 | ||
2259 | static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size) | |
2260 | { | |
2261 | raw_inode->i_size_lo = cpu_to_le32(i_size); | |
2262 | raw_inode->i_size_high = cpu_to_le32(i_size >> 32); | |
2263 | } | |
2264 | ||
2265 | static inline | |
2266 | struct ext4_group_info *ext4_get_group_info(struct super_block *sb, | |
2267 | ext4_group_t group) | |
2268 | { | |
2269 | struct ext4_group_info ***grp_info; | |
2270 | long indexv, indexh; | |
2271 | grp_info = EXT4_SB(sb)->s_group_info; | |
2272 | indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb)); | |
2273 | indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1); | |
2274 | return grp_info[indexv][indexh]; | |
2275 | } | |
2276 | ||
2277 | /* | |
2278 | * Reading s_groups_count requires using smp_rmb() afterwards. See | |
2279 | * the locking protocol documented in the comments of ext4_group_add() | |
2280 | * in resize.c | |
2281 | */ | |
2282 | static inline ext4_group_t ext4_get_groups_count(struct super_block *sb) | |
2283 | { | |
2284 | ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count; | |
2285 | ||
2286 | smp_rmb(); | |
2287 | return ngroups; | |
2288 | } | |
2289 | ||
2290 | static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi, | |
2291 | ext4_group_t block_group) | |
2292 | { | |
2293 | return block_group >> sbi->s_log_groups_per_flex; | |
2294 | } | |
2295 | ||
2296 | static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi) | |
2297 | { | |
2298 | return 1 << sbi->s_log_groups_per_flex; | |
2299 | } | |
2300 | ||
2301 | #define ext4_std_error(sb, errno) \ | |
2302 | do { \ | |
2303 | if ((errno)) \ | |
2304 | __ext4_std_error((sb), __func__, __LINE__, (errno)); \ | |
2305 | } while (0) | |
2306 | ||
2307 | #ifdef CONFIG_SMP | |
2308 | /* Each CPU can accumulate percpu_counter_batch clusters in their local | |
2309 | * counters. So we need to make sure we have free clusters more | |
2310 | * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times. | |
2311 | */ | |
2312 | #define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids)) | |
2313 | #else | |
2314 | #define EXT4_FREECLUSTERS_WATERMARK 0 | |
2315 | #endif | |
2316 | ||
2317 | static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize) | |
2318 | { | |
2319 | /* | |
2320 | * XXX: replace with spinlock if seen contended -bzzz | |
2321 | */ | |
2322 | down_write(&EXT4_I(inode)->i_data_sem); | |
2323 | if (newsize > EXT4_I(inode)->i_disksize) | |
2324 | EXT4_I(inode)->i_disksize = newsize; | |
2325 | up_write(&EXT4_I(inode)->i_data_sem); | |
2326 | return ; | |
2327 | } | |
2328 | ||
2329 | struct ext4_group_info { | |
2330 | unsigned long bb_state; | |
2331 | struct rb_root bb_free_root; | |
2332 | ext4_grpblk_t bb_first_free; /* first free block */ | |
2333 | ext4_grpblk_t bb_free; /* total free blocks */ | |
2334 | ext4_grpblk_t bb_fragments; /* nr of freespace fragments */ | |
2335 | ext4_grpblk_t bb_largest_free_order;/* order of largest frag in BG */ | |
2336 | struct list_head bb_prealloc_list; | |
2337 | #ifdef DOUBLE_CHECK | |
2338 | void *bb_bitmap; | |
2339 | #endif | |
2340 | struct rw_semaphore alloc_sem; | |
2341 | ext4_grpblk_t bb_counters[]; /* Nr of free power-of-two-block | |
2342 | * regions, index is order. | |
2343 | * bb_counters[3] = 5 means | |
2344 | * 5 free 8-block regions. */ | |
2345 | }; | |
2346 | ||
2347 | #define EXT4_GROUP_INFO_NEED_INIT_BIT 0 | |
2348 | #define EXT4_GROUP_INFO_WAS_TRIMMED_BIT 1 | |
2349 | ||
2350 | #define EXT4_MB_GRP_NEED_INIT(grp) \ | |
2351 | (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state))) | |
2352 | ||
2353 | #define EXT4_MB_GRP_WAS_TRIMMED(grp) \ | |
2354 | (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) | |
2355 | #define EXT4_MB_GRP_SET_TRIMMED(grp) \ | |
2356 | (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) | |
2357 | #define EXT4_MB_GRP_CLEAR_TRIMMED(grp) \ | |
2358 | (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) | |
2359 | ||
2360 | #define EXT4_MAX_CONTENTION 8 | |
2361 | #define EXT4_CONTENTION_THRESHOLD 2 | |
2362 | ||
2363 | static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb, | |
2364 | ext4_group_t group) | |
2365 | { | |
2366 | return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group); | |
2367 | } | |
2368 | ||
2369 | /* | |
2370 | * Returns true if the filesystem is busy enough that attempts to | |
2371 | * access the block group locks has run into contention. | |
2372 | */ | |
2373 | static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi) | |
2374 | { | |
2375 | return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD); | |
2376 | } | |
2377 | ||
2378 | static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group) | |
2379 | { | |
2380 | spinlock_t *lock = ext4_group_lock_ptr(sb, group); | |
2381 | if (spin_trylock(lock)) | |
2382 | /* | |
2383 | * We're able to grab the lock right away, so drop the | |
2384 | * lock contention counter. | |
2385 | */ | |
2386 | atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0); | |
2387 | else { | |
2388 | /* | |
2389 | * The lock is busy, so bump the contention counter, | |
2390 | * and then wait on the spin lock. | |
2391 | */ | |
2392 | atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1, | |
2393 | EXT4_MAX_CONTENTION); | |
2394 | spin_lock(lock); | |
2395 | } | |
2396 | } | |
2397 | ||
2398 | static inline void ext4_unlock_group(struct super_block *sb, | |
2399 | ext4_group_t group) | |
2400 | { | |
2401 | spin_unlock(ext4_group_lock_ptr(sb, group)); | |
2402 | } | |
2403 | ||
2404 | /* | |
2405 | * Block validity checking | |
2406 | */ | |
2407 | #define ext4_check_indirect_blockref(inode, bh) \ | |
2408 | ext4_check_blockref(__func__, __LINE__, inode, \ | |
2409 | (__le32 *)(bh)->b_data, \ | |
2410 | EXT4_ADDR_PER_BLOCK((inode)->i_sb)) | |
2411 | ||
2412 | #define ext4_ind_check_inode(inode) \ | |
2413 | ext4_check_blockref(__func__, __LINE__, inode, \ | |
2414 | EXT4_I(inode)->i_data, \ | |
2415 | EXT4_NDIR_BLOCKS) | |
2416 | ||
2417 | /* | |
2418 | * Inodes and files operations | |
2419 | */ | |
2420 | ||
2421 | /* dir.c */ | |
2422 | extern const struct file_operations ext4_dir_operations; | |
2423 | ||
2424 | /* file.c */ | |
2425 | extern const struct inode_operations ext4_file_inode_operations; | |
2426 | extern const struct file_operations ext4_file_operations; | |
2427 | extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin); | |
2428 | extern void ext4_unwritten_wait(struct inode *inode); | |
2429 | ||
2430 | /* namei.c */ | |
2431 | extern const struct inode_operations ext4_dir_inode_operations; | |
2432 | extern const struct inode_operations ext4_special_inode_operations; | |
2433 | extern struct dentry *ext4_get_parent(struct dentry *child); | |
2434 | extern struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode, | |
2435 | struct ext4_dir_entry_2 *de, | |
2436 | int blocksize, int csum_size, | |
2437 | unsigned int parent_ino, int dotdot_real_len); | |
2438 | ||
2439 | /* symlink.c */ | |
2440 | extern const struct inode_operations ext4_symlink_inode_operations; | |
2441 | extern const struct inode_operations ext4_fast_symlink_inode_operations; | |
2442 | ||
2443 | /* block_validity */ | |
2444 | extern void ext4_release_system_zone(struct super_block *sb); | |
2445 | extern int ext4_setup_system_zone(struct super_block *sb); | |
2446 | extern int __init ext4_init_system_zone(void); | |
2447 | extern void ext4_exit_system_zone(void); | |
2448 | extern int ext4_data_block_valid(struct ext4_sb_info *sbi, | |
2449 | ext4_fsblk_t start_blk, | |
2450 | unsigned int count); | |
2451 | extern int ext4_check_blockref(const char *, unsigned int, | |
2452 | struct inode *, __le32 *, unsigned int); | |
2453 | ||
2454 | /* extents.c */ | |
2455 | struct ext4_ext_path; | |
2456 | struct ext4_extent; | |
2457 | ||
2458 | extern int ext4_ext_tree_init(handle_t *handle, struct inode *); | |
2459 | extern int ext4_ext_writepage_trans_blocks(struct inode *, int); | |
2460 | extern int ext4_ext_index_trans_blocks(struct inode *inode, int nrblocks, | |
2461 | int chunk); | |
2462 | extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode, | |
2463 | struct ext4_map_blocks *map, int flags); | |
2464 | extern void ext4_ext_truncate(struct inode *); | |
2465 | extern int ext4_ext_punch_hole(struct file *file, loff_t offset, | |
2466 | loff_t length); | |
2467 | extern void ext4_ext_init(struct super_block *); | |
2468 | extern void ext4_ext_release(struct super_block *); | |
2469 | extern long ext4_fallocate(struct file *file, int mode, loff_t offset, | |
2470 | loff_t len); | |
2471 | extern int ext4_convert_unwritten_extents(struct inode *inode, loff_t offset, | |
2472 | ssize_t len); | |
2473 | extern int ext4_map_blocks(handle_t *handle, struct inode *inode, | |
2474 | struct ext4_map_blocks *map, int flags); | |
2475 | extern int ext4_ext_calc_metadata_amount(struct inode *inode, | |
2476 | ext4_lblk_t lblocks); | |
2477 | extern int ext4_extent_tree_init(handle_t *, struct inode *); | |
2478 | extern int ext4_ext_calc_credits_for_single_extent(struct inode *inode, | |
2479 | int num, | |
2480 | struct ext4_ext_path *path); | |
2481 | extern int ext4_can_extents_be_merged(struct inode *inode, | |
2482 | struct ext4_extent *ex1, | |
2483 | struct ext4_extent *ex2); | |
2484 | extern int ext4_ext_insert_extent(handle_t *, struct inode *, | |
2485 | struct ext4_ext_path *, | |
2486 | struct ext4_extent *, int); | |
2487 | extern struct ext4_ext_path *ext4_ext_find_extent(struct inode *, ext4_lblk_t, | |
2488 | struct ext4_ext_path *); | |
2489 | extern void ext4_ext_drop_refs(struct ext4_ext_path *); | |
2490 | extern int ext4_ext_check_inode(struct inode *inode); | |
2491 | extern int ext4_find_delalloc_cluster(struct inode *inode, ext4_lblk_t lblk); | |
2492 | extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, | |
2493 | __u64 start, __u64 len); | |
2494 | ||
2495 | ||
2496 | /* move_extent.c */ | |
2497 | extern int ext4_move_extents(struct file *o_filp, struct file *d_filp, | |
2498 | __u64 start_orig, __u64 start_donor, | |
2499 | __u64 len, __u64 *moved_len); | |
2500 | ||
2501 | /* page-io.c */ | |
2502 | extern int __init ext4_init_pageio(void); | |
2503 | extern void ext4_add_complete_io(ext4_io_end_t *io_end); | |
2504 | extern void ext4_exit_pageio(void); | |
2505 | extern void ext4_ioend_wait(struct inode *); | |
2506 | extern void ext4_free_io_end(ext4_io_end_t *io); | |
2507 | extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags); | |
2508 | extern void ext4_io_submit(struct ext4_io_submit *io); | |
2509 | extern int ext4_bio_write_page(struct ext4_io_submit *io, | |
2510 | struct page *page, | |
2511 | int len, | |
2512 | struct writeback_control *wbc); | |
2513 | ||
2514 | /* mmp.c */ | |
2515 | extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t); | |
2516 | extern void ext4_mmp_csum_set(struct super_block *sb, struct mmp_struct *mmp); | |
2517 | extern int ext4_mmp_csum_verify(struct super_block *sb, | |
2518 | struct mmp_struct *mmp); | |
2519 | ||
2520 | /* BH_Uninit flag: blocks are allocated but uninitialized on disk */ | |
2521 | enum ext4_state_bits { | |
2522 | BH_Uninit /* blocks are allocated but uninitialized on disk */ | |
2523 | = BH_JBDPrivateStart, | |
2524 | BH_AllocFromCluster, /* allocated blocks were part of already | |
2525 | * allocated cluster. Note that this flag will | |
2526 | * never, ever appear in a buffer_head's state | |
2527 | * flag. See EXT4_MAP_FROM_CLUSTER to see where | |
2528 | * this is used. */ | |
2529 | }; | |
2530 | ||
2531 | BUFFER_FNS(Uninit, uninit) | |
2532 | TAS_BUFFER_FNS(Uninit, uninit) | |
2533 | ||
2534 | /* | |
2535 | * Add new method to test wether block and inode bitmaps are properly | |
2536 | * initialized. With uninit_bg reading the block from disk is not enough | |
2537 | * to mark the bitmap uptodate. We need to also zero-out the bitmap | |
2538 | */ | |
2539 | #define BH_BITMAP_UPTODATE BH_JBDPrivateStart | |
2540 | ||
2541 | static inline int bitmap_uptodate(struct buffer_head *bh) | |
2542 | { | |
2543 | return (buffer_uptodate(bh) && | |
2544 | test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state)); | |
2545 | } | |
2546 | static inline void set_bitmap_uptodate(struct buffer_head *bh) | |
2547 | { | |
2548 | set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state); | |
2549 | } | |
2550 | ||
2551 | /* | |
2552 | * Disable DIO read nolock optimization, so new dioreaders will be forced | |
2553 | * to grab i_mutex | |
2554 | */ | |
2555 | static inline void ext4_inode_block_unlocked_dio(struct inode *inode) | |
2556 | { | |
2557 | ext4_set_inode_state(inode, EXT4_STATE_DIOREAD_LOCK); | |
2558 | smp_mb(); | |
2559 | } | |
2560 | static inline void ext4_inode_resume_unlocked_dio(struct inode *inode) | |
2561 | { | |
2562 | smp_mb(); | |
2563 | ext4_clear_inode_state(inode, EXT4_STATE_DIOREAD_LOCK); | |
2564 | } | |
2565 | ||
2566 | #define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1) | |
2567 | ||
2568 | /* For ioend & aio unwritten conversion wait queues */ | |
2569 | #define EXT4_WQ_HASH_SZ 37 | |
2570 | #define ext4_ioend_wq(v) (&ext4__ioend_wq[((unsigned long)(v)) %\ | |
2571 | EXT4_WQ_HASH_SZ]) | |
2572 | #define ext4_aio_mutex(v) (&ext4__aio_mutex[((unsigned long)(v)) %\ | |
2573 | EXT4_WQ_HASH_SZ]) | |
2574 | extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ]; | |
2575 | extern struct mutex ext4__aio_mutex[EXT4_WQ_HASH_SZ]; | |
2576 | ||
2577 | #define EXT4_RESIZING 0 | |
2578 | extern int ext4_resize_begin(struct super_block *sb); | |
2579 | extern void ext4_resize_end(struct super_block *sb); | |
2580 | ||
2581 | #endif /* __KERNEL__ */ | |
2582 | ||
2583 | #endif /* _EXT4_H */ |