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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 <linux/ratelimit.h>
33 : : #include <crypto/hash.h>
34 : : #ifdef __KERNEL__
35 : : #include <linux/compat.h>
36 : : #endif
37 : :
38 : : /*
39 : : * The fourth extended filesystem constants/structures
40 : : */
41 : :
42 : : /*
43 : : * Define EXT4FS_DEBUG to produce debug messages
44 : : */
45 : : #undef EXT4FS_DEBUG
46 : :
47 : : /*
48 : : * Debug code
49 : : */
50 : : #ifdef EXT4FS_DEBUG
51 : : #define ext4_debug(f, a...) \
52 : : do { \
53 : : printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \
54 : : __FILE__, __LINE__, __func__); \
55 : : printk(KERN_DEBUG f, ## a); \
56 : : } while (0)
57 : : #else
58 : : #define ext4_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__)
59 : : #endif
60 : :
61 : : /*
62 : : * Turn on EXT_DEBUG to get lots of info about extents operations.
63 : : */
64 : : #define EXT_DEBUG__
65 : : #ifdef EXT_DEBUG
66 : : #define ext_debug(fmt, ...) printk(fmt, ##__VA_ARGS__)
67 : : #else
68 : : #define ext_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__)
69 : : #endif
70 : :
71 : : #define EXT4_ERROR_INODE(inode, fmt, a...) \
72 : : ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a)
73 : :
74 : : #define EXT4_ERROR_INODE_BLOCK(inode, block, fmt, a...) \
75 : : ext4_error_inode((inode), __func__, __LINE__, (block), (fmt), ## a)
76 : :
77 : : #define EXT4_ERROR_FILE(file, block, fmt, a...) \
78 : : ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a)
79 : :
80 : : /* data type for block offset of block group */
81 : : typedef int ext4_grpblk_t;
82 : :
83 : : /* data type for filesystem-wide blocks number */
84 : : typedef unsigned long long ext4_fsblk_t;
85 : :
86 : : /* data type for file logical block number */
87 : : typedef __u32 ext4_lblk_t;
88 : :
89 : : /* data type for block group number */
90 : : typedef unsigned int ext4_group_t;
91 : :
92 : : /*
93 : : * Flags used in mballoc's allocation_context flags field.
94 : : *
95 : : * Also used to show what's going on for debugging purposes when the
96 : : * flag field is exported via the traceport interface
97 : : */
98 : :
99 : : /* prefer goal again. length */
100 : : #define EXT4_MB_HINT_MERGE 0x0001
101 : : /* blocks already reserved */
102 : : #define EXT4_MB_HINT_RESERVED 0x0002
103 : : /* metadata is being allocated */
104 : : #define EXT4_MB_HINT_METADATA 0x0004
105 : : /* first blocks in the file */
106 : : #define EXT4_MB_HINT_FIRST 0x0008
107 : : /* search for the best chunk */
108 : : #define EXT4_MB_HINT_BEST 0x0010
109 : : /* data is being allocated */
110 : : #define EXT4_MB_HINT_DATA 0x0020
111 : : /* don't preallocate (for tails) */
112 : : #define EXT4_MB_HINT_NOPREALLOC 0x0040
113 : : /* allocate for locality group */
114 : : #define EXT4_MB_HINT_GROUP_ALLOC 0x0080
115 : : /* allocate goal blocks or none */
116 : : #define EXT4_MB_HINT_GOAL_ONLY 0x0100
117 : : /* goal is meaningful */
118 : : #define EXT4_MB_HINT_TRY_GOAL 0x0200
119 : : /* blocks already pre-reserved by delayed allocation */
120 : : #define EXT4_MB_DELALLOC_RESERVED 0x0400
121 : : /* We are doing stream allocation */
122 : : #define EXT4_MB_STREAM_ALLOC 0x0800
123 : : /* Use reserved root blocks if needed */
124 : : #define EXT4_MB_USE_ROOT_BLOCKS 0x1000
125 : : /* Use blocks from reserved pool */
126 : : #define EXT4_MB_USE_RESERVED 0x2000
127 : :
128 : : struct ext4_allocation_request {
129 : : /* target inode for block we're allocating */
130 : : struct inode *inode;
131 : : /* how many blocks we want to allocate */
132 : : unsigned int len;
133 : : /* logical block in target inode */
134 : : ext4_lblk_t logical;
135 : : /* the closest logical allocated block to the left */
136 : : ext4_lblk_t lleft;
137 : : /* the closest logical allocated block to the right */
138 : : ext4_lblk_t lright;
139 : : /* phys. target (a hint) */
140 : : ext4_fsblk_t goal;
141 : : /* phys. block for the closest logical allocated block to the left */
142 : : ext4_fsblk_t pleft;
143 : : /* phys. block for the closest logical allocated block to the right */
144 : : ext4_fsblk_t pright;
145 : : /* flags. see above EXT4_MB_HINT_* */
146 : : unsigned int flags;
147 : : };
148 : :
149 : : /*
150 : : * Logical to physical block mapping, used by ext4_map_blocks()
151 : : *
152 : : * This structure is used to pass requests into ext4_map_blocks() as
153 : : * well as to store the information returned by ext4_map_blocks(). It
154 : : * takes less room on the stack than a struct buffer_head.
155 : : */
156 : : #define EXT4_MAP_NEW (1 << BH_New)
157 : : #define EXT4_MAP_MAPPED (1 << BH_Mapped)
158 : : #define EXT4_MAP_UNWRITTEN (1 << BH_Unwritten)
159 : : #define EXT4_MAP_BOUNDARY (1 << BH_Boundary)
160 : : #define EXT4_MAP_UNINIT (1 << BH_Uninit)
161 : : /* Sometimes (in the bigalloc case, from ext4_da_get_block_prep) the caller of
162 : : * ext4_map_blocks wants to know whether or not the underlying cluster has
163 : : * already been accounted for. EXT4_MAP_FROM_CLUSTER conveys to the caller that
164 : : * the requested mapping was from previously mapped (or delayed allocated)
165 : : * cluster. We use BH_AllocFromCluster only for this flag. BH_AllocFromCluster
166 : : * should never appear on buffer_head's state flags.
167 : : */
168 : : #define EXT4_MAP_FROM_CLUSTER (1 << BH_AllocFromCluster)
169 : : #define EXT4_MAP_FLAGS (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\
170 : : EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY |\
171 : : EXT4_MAP_UNINIT | EXT4_MAP_FROM_CLUSTER)
172 : :
173 : : struct ext4_map_blocks {
174 : : ext4_fsblk_t m_pblk;
175 : : ext4_lblk_t m_lblk;
176 : : unsigned int m_len;
177 : : unsigned int m_flags;
178 : : };
179 : :
180 : : /*
181 : : * Flags for ext4_io_end->flags
182 : : */
183 : : #define EXT4_IO_END_UNWRITTEN 0x0001
184 : :
185 : : /*
186 : : * For converting uninitialized extents on a work queue. 'handle' is used for
187 : : * buffered writeback.
188 : : */
189 : : typedef struct ext4_io_end {
190 : : struct list_head list; /* per-file finished IO list */
191 : : handle_t *handle; /* handle reserved for extent
192 : : * conversion */
193 : : struct inode *inode; /* file being written to */
194 : : struct bio *bio; /* Linked list of completed
195 : : * bios covering the extent */
196 : : unsigned int flag; /* unwritten or not */
197 : : loff_t offset; /* offset in the file */
198 : : ssize_t size; /* size of the extent */
199 : : atomic_t count; /* reference counter */
200 : : } ext4_io_end_t;
201 : :
202 : : struct ext4_io_submit {
203 : : int io_op;
204 : : struct bio *io_bio;
205 : : ext4_io_end_t *io_end;
206 : : sector_t io_next_block;
207 : : };
208 : :
209 : : /*
210 : : * Special inodes numbers
211 : : */
212 : : #define EXT4_BAD_INO 1 /* Bad blocks inode */
213 : : #define EXT4_ROOT_INO 2 /* Root inode */
214 : : #define EXT4_USR_QUOTA_INO 3 /* User quota inode */
215 : : #define EXT4_GRP_QUOTA_INO 4 /* Group quota inode */
216 : : #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */
217 : : #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */
218 : : #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */
219 : : #define EXT4_JOURNAL_INO 8 /* Journal inode */
220 : :
221 : : /* First non-reserved inode for old ext4 filesystems */
222 : : #define EXT4_GOOD_OLD_FIRST_INO 11
223 : :
224 : : /*
225 : : * Maximal count of links to a file
226 : : */
227 : : #define EXT4_LINK_MAX 65000
228 : :
229 : : /*
230 : : * Macro-instructions used to manage several block sizes
231 : : */
232 : : #define EXT4_MIN_BLOCK_SIZE 1024
233 : : #define EXT4_MAX_BLOCK_SIZE 65536
234 : : #define EXT4_MIN_BLOCK_LOG_SIZE 10
235 : : #define EXT4_MAX_BLOCK_LOG_SIZE 16
236 : : #ifdef __KERNEL__
237 : : # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize)
238 : : #else
239 : : # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
240 : : #endif
241 : : #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32))
242 : : #define EXT4_CLUSTER_SIZE(s) (EXT4_BLOCK_SIZE(s) << \
243 : : EXT4_SB(s)->s_cluster_bits)
244 : : #ifdef __KERNEL__
245 : : # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits)
246 : : # define EXT4_CLUSTER_BITS(s) (EXT4_SB(s)->s_cluster_bits)
247 : : #else
248 : : # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10)
249 : : #endif
250 : : #ifdef __KERNEL__
251 : : #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits)
252 : : #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size)
253 : : #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino)
254 : : #else
255 : : #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
256 : : EXT4_GOOD_OLD_INODE_SIZE : \
257 : : (s)->s_inode_size)
258 : : #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
259 : : EXT4_GOOD_OLD_FIRST_INO : \
260 : : (s)->s_first_ino)
261 : : #endif
262 : : #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits)))
263 : :
264 : : /* Translate a block number to a cluster number */
265 : : #define EXT4_B2C(sbi, blk) ((blk) >> (sbi)->s_cluster_bits)
266 : : /* Translate a cluster number to a block number */
267 : : #define EXT4_C2B(sbi, cluster) ((cluster) << (sbi)->s_cluster_bits)
268 : : /* Translate # of blks to # of clusters */
269 : : #define EXT4_NUM_B2C(sbi, blks) (((blks) + (sbi)->s_cluster_ratio - 1) >> \
270 : : (sbi)->s_cluster_bits)
271 : : /* Mask out the low bits to get the starting block of the cluster */
272 : : #define EXT4_PBLK_CMASK(s, pblk) ((pblk) & \
273 : : ~((ext4_fsblk_t) (s)->s_cluster_ratio - 1))
274 : : #define EXT4_LBLK_CMASK(s, lblk) ((lblk) & \
275 : : ~((ext4_lblk_t) (s)->s_cluster_ratio - 1))
276 : : /* Get the cluster offset */
277 : : #define EXT4_PBLK_COFF(s, pblk) ((pblk) & \
278 : : ((ext4_fsblk_t) (s)->s_cluster_ratio - 1))
279 : : #define EXT4_LBLK_COFF(s, lblk) ((lblk) & \
280 : : ((ext4_lblk_t) (s)->s_cluster_ratio - 1))
281 : :
282 : : /*
283 : : * Structure of a blocks group descriptor
284 : : */
285 : : struct ext4_group_desc
286 : : {
287 : : __le32 bg_block_bitmap_lo; /* Blocks bitmap block */
288 : : __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */
289 : : __le32 bg_inode_table_lo; /* Inodes table block */
290 : : __le16 bg_free_blocks_count_lo;/* Free blocks count */
291 : : __le16 bg_free_inodes_count_lo;/* Free inodes count */
292 : : __le16 bg_used_dirs_count_lo; /* Directories count */
293 : : __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */
294 : : __le32 bg_exclude_bitmap_lo; /* Exclude bitmap for snapshots */
295 : : __le16 bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bbitmap) LE */
296 : : __le16 bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+ibitmap) LE */
297 : : __le16 bg_itable_unused_lo; /* Unused inodes count */
298 : : __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */
299 : : __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */
300 : : __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */
301 : : __le32 bg_inode_table_hi; /* Inodes table block MSB */
302 : : __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */
303 : : __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */
304 : : __le16 bg_used_dirs_count_hi; /* Directories count MSB */
305 : : __le16 bg_itable_unused_hi; /* Unused inodes count MSB */
306 : : __le32 bg_exclude_bitmap_hi; /* Exclude bitmap block MSB */
307 : : __le16 bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bbitmap) BE */
308 : : __le16 bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+ibitmap) BE */
309 : : __u32 bg_reserved;
310 : : };
311 : :
312 : : #define EXT4_BG_INODE_BITMAP_CSUM_HI_END \
313 : : (offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \
314 : : sizeof(__le16))
315 : : #define EXT4_BG_BLOCK_BITMAP_CSUM_HI_END \
316 : : (offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \
317 : : sizeof(__le16))
318 : :
319 : : /*
320 : : * Structure of a flex block group info
321 : : */
322 : :
323 : : struct flex_groups {
324 : : atomic64_t free_clusters;
325 : : atomic_t free_inodes;
326 : : atomic_t used_dirs;
327 : : };
328 : :
329 : : #define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */
330 : : #define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */
331 : : #define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */
332 : :
333 : : /*
334 : : * Macro-instructions used to manage group descriptors
335 : : */
336 : : #define EXT4_MIN_DESC_SIZE 32
337 : : #define EXT4_MIN_DESC_SIZE_64BIT 64
338 : : #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE
339 : : #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size)
340 : : #ifdef __KERNEL__
341 : : # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group)
342 : : # define EXT4_CLUSTERS_PER_GROUP(s) (EXT4_SB(s)->s_clusters_per_group)
343 : : # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block)
344 : : # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group)
345 : : # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits)
346 : : #else
347 : : # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group)
348 : : # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
349 : : # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group)
350 : : #endif
351 : :
352 : : /*
353 : : * Constants relative to the data blocks
354 : : */
355 : : #define EXT4_NDIR_BLOCKS 12
356 : : #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS
357 : : #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1)
358 : : #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1)
359 : : #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1)
360 : :
361 : : /*
362 : : * Inode flags
363 : : */
364 : : #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */
365 : : #define EXT4_UNRM_FL 0x00000002 /* Undelete */
366 : : #define EXT4_COMPR_FL 0x00000004 /* Compress file */
367 : : #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */
368 : : #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */
369 : : #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */
370 : : #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */
371 : : #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */
372 : : /* Reserved for compression usage... */
373 : : #define EXT4_DIRTY_FL 0x00000100
374 : : #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
375 : : #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */
376 : : #define EXT4_ECOMPR_FL 0x00000800 /* Compression error */
377 : : /* End compression flags --- maybe not all used */
378 : : #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */
379 : : #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */
380 : : #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */
381 : : #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */
382 : : #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
383 : : #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
384 : : #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */
385 : : #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */
386 : : #define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */
387 : : #define EXT4_EOFBLOCKS_FL 0x00400000 /* Blocks allocated beyond EOF */
388 : : #define EXT4_INLINE_DATA_FL 0x10000000 /* Inode has inline data. */
389 : : #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */
390 : :
391 : : #define EXT4_FL_USER_VISIBLE 0x004BDFFF /* User visible flags */
392 : : #define EXT4_FL_USER_MODIFIABLE 0x004380FF /* User modifiable flags */
393 : :
394 : : /* Flags that should be inherited by new inodes from their parent. */
395 : : #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\
396 : : EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\
397 : : EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\
398 : : EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL)
399 : :
400 : : /* Flags that are appropriate for regular files (all but dir-specific ones). */
401 : : #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL))
402 : :
403 : : /* Flags that are appropriate for non-directories/regular files. */
404 : : #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL)
405 : :
406 : : /* Mask out flags that are inappropriate for the given type of inode. */
407 : : static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags)
408 : : {
409 [ + + ][ + - ]: 465538 : if (S_ISDIR(mode))
410 : : return flags;
411 [ + + ]: 423654 : else if (S_ISREG(mode))
412 : 329346 : return flags & EXT4_REG_FLMASK;
413 : : else
414 : 94308 : return flags & EXT4_OTHER_FLMASK;
415 : : }
416 : :
417 : : /*
418 : : * Inode flags used for atomic set/get
419 : : */
420 : : enum {
421 : : EXT4_INODE_SECRM = 0, /* Secure deletion */
422 : : EXT4_INODE_UNRM = 1, /* Undelete */
423 : : EXT4_INODE_COMPR = 2, /* Compress file */
424 : : EXT4_INODE_SYNC = 3, /* Synchronous updates */
425 : : EXT4_INODE_IMMUTABLE = 4, /* Immutable file */
426 : : EXT4_INODE_APPEND = 5, /* writes to file may only append */
427 : : EXT4_INODE_NODUMP = 6, /* do not dump file */
428 : : EXT4_INODE_NOATIME = 7, /* do not update atime */
429 : : /* Reserved for compression usage... */
430 : : EXT4_INODE_DIRTY = 8,
431 : : EXT4_INODE_COMPRBLK = 9, /* One or more compressed clusters */
432 : : EXT4_INODE_NOCOMPR = 10, /* Don't compress */
433 : : EXT4_INODE_ECOMPR = 11, /* Compression error */
434 : : /* End compression flags --- maybe not all used */
435 : : EXT4_INODE_INDEX = 12, /* hash-indexed directory */
436 : : EXT4_INODE_IMAGIC = 13, /* AFS directory */
437 : : EXT4_INODE_JOURNAL_DATA = 14, /* file data should be journaled */
438 : : EXT4_INODE_NOTAIL = 15, /* file tail should not be merged */
439 : : EXT4_INODE_DIRSYNC = 16, /* dirsync behaviour (directories only) */
440 : : EXT4_INODE_TOPDIR = 17, /* Top of directory hierarchies*/
441 : : EXT4_INODE_HUGE_FILE = 18, /* Set to each huge file */
442 : : EXT4_INODE_EXTENTS = 19, /* Inode uses extents */
443 : : EXT4_INODE_EA_INODE = 21, /* Inode used for large EA */
444 : : EXT4_INODE_EOFBLOCKS = 22, /* Blocks allocated beyond EOF */
445 : : EXT4_INODE_INLINE_DATA = 28, /* Data in inode. */
446 : : EXT4_INODE_RESERVED = 31, /* reserved for ext4 lib */
447 : : };
448 : :
449 : : /*
450 : : * Since it's pretty easy to mix up bit numbers and hex values, we use a
451 : : * build-time check to make sure that EXT4_XXX_FL is consistent with respect to
452 : : * EXT4_INODE_XXX. If all is well, the macros will be dropped, so, it won't cost
453 : : * any extra space in the compiled kernel image, otherwise, the build will fail.
454 : : * It's important that these values are the same, since we are using
455 : : * EXT4_INODE_XXX to test for flag values, but EXT4_XXX_FL must be consistent
456 : : * with the values of FS_XXX_FL defined in include/linux/fs.h and the on-disk
457 : : * values found in ext2, ext3 and ext4 filesystems, and of course the values
458 : : * defined in e2fsprogs.
459 : : *
460 : : * It's not paranoia if the Murphy's Law really *is* out to get you. :-)
461 : : */
462 : : #define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG))
463 : : #define CHECK_FLAG_VALUE(FLAG) BUILD_BUG_ON(!TEST_FLAG_VALUE(FLAG))
464 : :
465 : : static inline void ext4_check_flag_values(void)
466 : : {
467 : : CHECK_FLAG_VALUE(SECRM);
468 : : CHECK_FLAG_VALUE(UNRM);
469 : : CHECK_FLAG_VALUE(COMPR);
470 : : CHECK_FLAG_VALUE(SYNC);
471 : : CHECK_FLAG_VALUE(IMMUTABLE);
472 : : CHECK_FLAG_VALUE(APPEND);
473 : : CHECK_FLAG_VALUE(NODUMP);
474 : : CHECK_FLAG_VALUE(NOATIME);
475 : : CHECK_FLAG_VALUE(DIRTY);
476 : : CHECK_FLAG_VALUE(COMPRBLK);
477 : : CHECK_FLAG_VALUE(NOCOMPR);
478 : : CHECK_FLAG_VALUE(ECOMPR);
479 : : CHECK_FLAG_VALUE(INDEX);
480 : : CHECK_FLAG_VALUE(IMAGIC);
481 : : CHECK_FLAG_VALUE(JOURNAL_DATA);
482 : : CHECK_FLAG_VALUE(NOTAIL);
483 : : CHECK_FLAG_VALUE(DIRSYNC);
484 : : CHECK_FLAG_VALUE(TOPDIR);
485 : : CHECK_FLAG_VALUE(HUGE_FILE);
486 : : CHECK_FLAG_VALUE(EXTENTS);
487 : : CHECK_FLAG_VALUE(EA_INODE);
488 : : CHECK_FLAG_VALUE(EOFBLOCKS);
489 : : CHECK_FLAG_VALUE(INLINE_DATA);
490 : : CHECK_FLAG_VALUE(RESERVED);
491 : : }
492 : :
493 : : /* Used to pass group descriptor data when online resize is done */
494 : : struct ext4_new_group_input {
495 : : __u32 group; /* Group number for this data */
496 : : __u64 block_bitmap; /* Absolute block number of block bitmap */
497 : : __u64 inode_bitmap; /* Absolute block number of inode bitmap */
498 : : __u64 inode_table; /* Absolute block number of inode table start */
499 : : __u32 blocks_count; /* Total number of blocks in this group */
500 : : __u16 reserved_blocks; /* Number of reserved blocks in this group */
501 : : __u16 unused;
502 : : };
503 : :
504 : : #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
505 : : struct compat_ext4_new_group_input {
506 : : u32 group;
507 : : compat_u64 block_bitmap;
508 : : compat_u64 inode_bitmap;
509 : : compat_u64 inode_table;
510 : : u32 blocks_count;
511 : : u16 reserved_blocks;
512 : : u16 unused;
513 : : };
514 : : #endif
515 : :
516 : : /* The struct ext4_new_group_input in kernel space, with free_blocks_count */
517 : : struct ext4_new_group_data {
518 : : __u32 group;
519 : : __u64 block_bitmap;
520 : : __u64 inode_bitmap;
521 : : __u64 inode_table;
522 : : __u32 blocks_count;
523 : : __u16 reserved_blocks;
524 : : __u16 unused;
525 : : __u32 free_blocks_count;
526 : : };
527 : :
528 : : /* Indexes used to index group tables in ext4_new_group_data */
529 : : enum {
530 : : BLOCK_BITMAP = 0, /* block bitmap */
531 : : INODE_BITMAP, /* inode bitmap */
532 : : INODE_TABLE, /* inode tables */
533 : : GROUP_TABLE_COUNT,
534 : : };
535 : :
536 : : /*
537 : : * Flags used by ext4_map_blocks()
538 : : */
539 : : /* Allocate any needed blocks and/or convert an unitialized
540 : : extent to be an initialized ext4 */
541 : : #define EXT4_GET_BLOCKS_CREATE 0x0001
542 : : /* Request the creation of an unitialized extent */
543 : : #define EXT4_GET_BLOCKS_UNINIT_EXT 0x0002
544 : : #define EXT4_GET_BLOCKS_CREATE_UNINIT_EXT (EXT4_GET_BLOCKS_UNINIT_EXT|\
545 : : EXT4_GET_BLOCKS_CREATE)
546 : : /* Caller is from the delayed allocation writeout path
547 : : * finally doing the actual allocation of delayed blocks */
548 : : #define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004
549 : : /* caller is from the direct IO path, request to creation of an
550 : : unitialized extents if not allocated, split the uninitialized
551 : : extent if blocks has been preallocated already*/
552 : : #define EXT4_GET_BLOCKS_PRE_IO 0x0008
553 : : #define EXT4_GET_BLOCKS_CONVERT 0x0010
554 : : #define EXT4_GET_BLOCKS_IO_CREATE_EXT (EXT4_GET_BLOCKS_PRE_IO|\
555 : : EXT4_GET_BLOCKS_CREATE_UNINIT_EXT)
556 : : /* Convert extent to initialized after IO complete */
557 : : #define EXT4_GET_BLOCKS_IO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT|\
558 : : EXT4_GET_BLOCKS_CREATE_UNINIT_EXT)
559 : : /* Eventual metadata allocation (due to growing extent tree)
560 : : * should not fail, so try to use reserved blocks for that.*/
561 : : #define EXT4_GET_BLOCKS_METADATA_NOFAIL 0x0020
562 : : /* Don't normalize allocation size (used for fallocate) */
563 : : #define EXT4_GET_BLOCKS_NO_NORMALIZE 0x0040
564 : : /* Request will not result in inode size update (user for fallocate) */
565 : : #define EXT4_GET_BLOCKS_KEEP_SIZE 0x0080
566 : : /* Do not take i_data_sem locking in ext4_map_blocks */
567 : : #define EXT4_GET_BLOCKS_NO_LOCK 0x0100
568 : : /* Do not put hole in extent cache */
569 : : #define EXT4_GET_BLOCKS_NO_PUT_HOLE 0x0200
570 : :
571 : : /*
572 : : * The bit position of these flags must not overlap with any of the
573 : : * EXT4_GET_BLOCKS_*. They are used by ext4_ext_find_extent(),
574 : : * read_extent_tree_block(), ext4_split_extent_at(),
575 : : * ext4_ext_insert_extent(), and ext4_ext_create_new_leaf().
576 : : * EXT4_EX_NOCACHE is used to indicate that the we shouldn't be
577 : : * caching the extents when reading from the extent tree while a
578 : : * truncate or punch hole operation is in progress.
579 : : */
580 : : #define EXT4_EX_NOCACHE 0x0400
581 : : #define EXT4_EX_FORCE_CACHE 0x0800
582 : :
583 : : /*
584 : : * Flags used by ext4_free_blocks
585 : : */
586 : : #define EXT4_FREE_BLOCKS_METADATA 0x0001
587 : : #define EXT4_FREE_BLOCKS_FORGET 0x0002
588 : : #define EXT4_FREE_BLOCKS_VALIDATED 0x0004
589 : : #define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE 0x0008
590 : : #define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER 0x0010
591 : : #define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER 0x0020
592 : : #define EXT4_FREE_BLOCKS_RESERVE 0x0040
593 : :
594 : : /*
595 : : * ioctl commands
596 : : */
597 : : #define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS
598 : : #define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS
599 : : #define EXT4_IOC_GETVERSION _IOR('f', 3, long)
600 : : #define EXT4_IOC_SETVERSION _IOW('f', 4, long)
601 : : #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION
602 : : #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION
603 : : #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long)
604 : : #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long)
605 : : #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long)
606 : : #define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input)
607 : : #define EXT4_IOC_MIGRATE _IO('f', 9)
608 : : /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */
609 : : /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */
610 : : #define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12)
611 : : #define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent)
612 : : #define EXT4_IOC_RESIZE_FS _IOW('f', 16, __u64)
613 : : #define EXT4_IOC_SWAP_BOOT _IO('f', 17)
614 : : #define EXT4_IOC_PRECACHE_EXTENTS _IO('f', 18)
615 : :
616 : : #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
617 : : /*
618 : : * ioctl commands in 32 bit emulation
619 : : */
620 : : #define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS
621 : : #define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS
622 : : #define EXT4_IOC32_GETVERSION _IOR('f', 3, int)
623 : : #define EXT4_IOC32_SETVERSION _IOW('f', 4, int)
624 : : #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int)
625 : : #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int)
626 : : #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int)
627 : : #define EXT4_IOC32_GROUP_ADD _IOW('f', 8, struct compat_ext4_new_group_input)
628 : : #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION
629 : : #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION
630 : : #endif
631 : :
632 : : /* Max physical block we can address w/o extents */
633 : : #define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF
634 : :
635 : : /*
636 : : * Structure of an inode on the disk
637 : : */
638 : : struct ext4_inode {
639 : : __le16 i_mode; /* File mode */
640 : : __le16 i_uid; /* Low 16 bits of Owner Uid */
641 : : __le32 i_size_lo; /* Size in bytes */
642 : : __le32 i_atime; /* Access time */
643 : : __le32 i_ctime; /* Inode Change time */
644 : : __le32 i_mtime; /* Modification time */
645 : : __le32 i_dtime; /* Deletion Time */
646 : : __le16 i_gid; /* Low 16 bits of Group Id */
647 : : __le16 i_links_count; /* Links count */
648 : : __le32 i_blocks_lo; /* Blocks count */
649 : : __le32 i_flags; /* File flags */
650 : : union {
651 : : struct {
652 : : __le32 l_i_version;
653 : : } linux1;
654 : : struct {
655 : : __u32 h_i_translator;
656 : : } hurd1;
657 : : struct {
658 : : __u32 m_i_reserved1;
659 : : } masix1;
660 : : } osd1; /* OS dependent 1 */
661 : : __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
662 : : __le32 i_generation; /* File version (for NFS) */
663 : : __le32 i_file_acl_lo; /* File ACL */
664 : : __le32 i_size_high;
665 : : __le32 i_obso_faddr; /* Obsoleted fragment address */
666 : : union {
667 : : struct {
668 : : __le16 l_i_blocks_high; /* were l_i_reserved1 */
669 : : __le16 l_i_file_acl_high;
670 : : __le16 l_i_uid_high; /* these 2 fields */
671 : : __le16 l_i_gid_high; /* were reserved2[0] */
672 : : __le16 l_i_checksum_lo;/* crc32c(uuid+inum+inode) LE */
673 : : __le16 l_i_reserved;
674 : : } linux2;
675 : : struct {
676 : : __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
677 : : __u16 h_i_mode_high;
678 : : __u16 h_i_uid_high;
679 : : __u16 h_i_gid_high;
680 : : __u32 h_i_author;
681 : : } hurd2;
682 : : struct {
683 : : __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
684 : : __le16 m_i_file_acl_high;
685 : : __u32 m_i_reserved2[2];
686 : : } masix2;
687 : : } osd2; /* OS dependent 2 */
688 : : __le16 i_extra_isize;
689 : : __le16 i_checksum_hi; /* crc32c(uuid+inum+inode) BE */
690 : : __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */
691 : : __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */
692 : : __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */
693 : : __le32 i_crtime; /* File Creation time */
694 : : __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */
695 : : __le32 i_version_hi; /* high 32 bits for 64-bit version */
696 : : };
697 : :
698 : : struct move_extent {
699 : : __u32 reserved; /* should be zero */
700 : : __u32 donor_fd; /* donor file descriptor */
701 : : __u64 orig_start; /* logical start offset in block for orig */
702 : : __u64 donor_start; /* logical start offset in block for donor */
703 : : __u64 len; /* block length to be moved */
704 : : __u64 moved_len; /* moved block length */
705 : : };
706 : :
707 : : #define EXT4_EPOCH_BITS 2
708 : : #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
709 : : #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS)
710 : :
711 : : /*
712 : : * Extended fields will fit into an inode if the filesystem was formatted
713 : : * with large inodes (-I 256 or larger) and there are not currently any EAs
714 : : * consuming all of the available space. For new inodes we always reserve
715 : : * enough space for the kernel's known extended fields, but for inodes
716 : : * created with an old kernel this might not have been the case. None of
717 : : * the extended inode fields is critical for correct filesystem operation.
718 : : * This macro checks if a certain field fits in the inode. Note that
719 : : * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
720 : : */
721 : : #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \
722 : : ((offsetof(typeof(*ext4_inode), field) + \
723 : : sizeof((ext4_inode)->field)) \
724 : : <= (EXT4_GOOD_OLD_INODE_SIZE + \
725 : : (einode)->i_extra_isize)) \
726 : :
727 : : static inline __le32 ext4_encode_extra_time(struct timespec *time)
728 : : {
729 : 43403471 : return cpu_to_le32((sizeof(time->tv_sec) > 4 ?
730 : : (time->tv_sec >> 32) & EXT4_EPOCH_MASK : 0) |
731 : : ((time->tv_nsec << EXT4_EPOCH_BITS) & EXT4_NSEC_MASK));
732 : : }
733 : :
734 : : static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra)
735 : : {
736 : : if (sizeof(time->tv_sec) > 4)
737 : : time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK)
738 : : << 32;
739 : 22140 : time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS;
740 : : }
741 : :
742 : : #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \
743 : : do { \
744 : : (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \
745 : : if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
746 : : (raw_inode)->xtime ## _extra = \
747 : : ext4_encode_extra_time(&(inode)->xtime); \
748 : : } while (0)
749 : :
750 : : #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \
751 : : do { \
752 : : if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
753 : : (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \
754 : : if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
755 : : (raw_inode)->xtime ## _extra = \
756 : : ext4_encode_extra_time(&(einode)->xtime); \
757 : : } while (0)
758 : :
759 : : #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \
760 : : do { \
761 : : (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \
762 : : if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
763 : : ext4_decode_extra_time(&(inode)->xtime, \
764 : : raw_inode->xtime ## _extra); \
765 : : else \
766 : : (inode)->xtime.tv_nsec = 0; \
767 : : } while (0)
768 : :
769 : : #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \
770 : : do { \
771 : : if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
772 : : (einode)->xtime.tv_sec = \
773 : : (signed)le32_to_cpu((raw_inode)->xtime); \
774 : : if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
775 : : ext4_decode_extra_time(&(einode)->xtime, \
776 : : raw_inode->xtime ## _extra); \
777 : : else \
778 : : (einode)->xtime.tv_nsec = 0; \
779 : : } while (0)
780 : :
781 : : #define i_disk_version osd1.linux1.l_i_version
782 : :
783 : : #if defined(__KERNEL__) || defined(__linux__)
784 : : #define i_reserved1 osd1.linux1.l_i_reserved1
785 : : #define i_file_acl_high osd2.linux2.l_i_file_acl_high
786 : : #define i_blocks_high osd2.linux2.l_i_blocks_high
787 : : #define i_uid_low i_uid
788 : : #define i_gid_low i_gid
789 : : #define i_uid_high osd2.linux2.l_i_uid_high
790 : : #define i_gid_high osd2.linux2.l_i_gid_high
791 : : #define i_checksum_lo osd2.linux2.l_i_checksum_lo
792 : :
793 : : #elif defined(__GNU__)
794 : :
795 : : #define i_translator osd1.hurd1.h_i_translator
796 : : #define i_uid_high osd2.hurd2.h_i_uid_high
797 : : #define i_gid_high osd2.hurd2.h_i_gid_high
798 : : #define i_author osd2.hurd2.h_i_author
799 : :
800 : : #elif defined(__masix__)
801 : :
802 : : #define i_reserved1 osd1.masix1.m_i_reserved1
803 : : #define i_file_acl_high osd2.masix2.m_i_file_acl_high
804 : : #define i_reserved2 osd2.masix2.m_i_reserved2
805 : :
806 : : #endif /* defined(__KERNEL__) || defined(__linux__) */
807 : :
808 : : #include "extents_status.h"
809 : :
810 : : /*
811 : : * fourth extended file system inode data in memory
812 : : */
813 : : struct ext4_inode_info {
814 : : __le32 i_data[15]; /* unconverted */
815 : : __u32 i_dtime;
816 : : ext4_fsblk_t i_file_acl;
817 : :
818 : : /*
819 : : * i_block_group is the number of the block group which contains
820 : : * this file's inode. Constant across the lifetime of the inode,
821 : : * it is ued for making block allocation decisions - we try to
822 : : * place a file's data blocks near its inode block, and new inodes
823 : : * near to their parent directory's inode.
824 : : */
825 : : ext4_group_t i_block_group;
826 : : ext4_lblk_t i_dir_start_lookup;
827 : : #if (BITS_PER_LONG < 64)
828 : : unsigned long i_state_flags; /* Dynamic state flags */
829 : : #endif
830 : : unsigned long i_flags;
831 : :
832 : : /*
833 : : * Extended attributes can be read independently of the main file
834 : : * data. Taking i_mutex even when reading would cause contention
835 : : * between readers of EAs and writers of regular file data, so
836 : : * instead we synchronize on xattr_sem when reading or changing
837 : : * EAs.
838 : : */
839 : : struct rw_semaphore xattr_sem;
840 : :
841 : : struct list_head i_orphan; /* unlinked but open inodes */
842 : :
843 : : /*
844 : : * i_disksize keeps track of what the inode size is ON DISK, not
845 : : * in memory. During truncate, i_size is set to the new size by
846 : : * the VFS prior to calling ext4_truncate(), but the filesystem won't
847 : : * set i_disksize to 0 until the truncate is actually under way.
848 : : *
849 : : * The intent is that i_disksize always represents the blocks which
850 : : * are used by this file. This allows recovery to restart truncate
851 : : * on orphans if we crash during truncate. We actually write i_disksize
852 : : * into the on-disk inode when writing inodes out, instead of i_size.
853 : : *
854 : : * The only time when i_disksize and i_size may be different is when
855 : : * a truncate is in progress. The only things which change i_disksize
856 : : * are ext4_get_block (growth) and ext4_truncate (shrinkth).
857 : : */
858 : : loff_t i_disksize;
859 : :
860 : : /*
861 : : * i_data_sem is for serialising ext4_truncate() against
862 : : * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's
863 : : * data tree are chopped off during truncate. We can't do that in
864 : : * ext4 because whenever we perform intermediate commits during
865 : : * truncate, the inode and all the metadata blocks *must* be in a
866 : : * consistent state which allows truncation of the orphans to restart
867 : : * during recovery. Hence we must fix the get_block-vs-truncate race
868 : : * by other means, so we have i_data_sem.
869 : : */
870 : : struct rw_semaphore i_data_sem;
871 : : struct inode vfs_inode;
872 : : struct jbd2_inode *jinode;
873 : :
874 : : /*
875 : : * File creation time. Its function is same as that of
876 : : * struct timespec i_{a,c,m}time in the generic inode.
877 : : */
878 : : struct timespec i_crtime;
879 : :
880 : : /* mballoc */
881 : : struct list_head i_prealloc_list;
882 : : spinlock_t i_prealloc_lock;
883 : :
884 : : /* extents status tree */
885 : : struct ext4_es_tree i_es_tree;
886 : : rwlock_t i_es_lock;
887 : : struct list_head i_es_lru;
888 : : unsigned int i_es_lru_nr; /* protected by i_es_lock */
889 : : unsigned long i_touch_when; /* jiffies of last accessing */
890 : :
891 : : /* ialloc */
892 : : ext4_group_t i_last_alloc_group;
893 : :
894 : : /* allocation reservation info for delalloc */
895 : : /* In case of bigalloc, these refer to clusters rather than blocks */
896 : : unsigned int i_reserved_data_blocks;
897 : : unsigned int i_reserved_meta_blocks;
898 : : unsigned int i_allocated_meta_blocks;
899 : : ext4_lblk_t i_da_metadata_calc_last_lblock;
900 : : int i_da_metadata_calc_len;
901 : :
902 : : /* on-disk additional length */
903 : : __u16 i_extra_isize;
904 : :
905 : : /* Indicate the inline data space. */
906 : : u16 i_inline_off;
907 : : u16 i_inline_size;
908 : :
909 : : #ifdef CONFIG_QUOTA
910 : : /* quota space reservation, managed internally by quota code */
911 : : qsize_t i_reserved_quota;
912 : : #endif
913 : :
914 : : /* Lock protecting lists below */
915 : : spinlock_t i_completed_io_lock;
916 : : /*
917 : : * Completed IOs that need unwritten extents handling and have
918 : : * transaction reserved
919 : : */
920 : : struct list_head i_rsv_conversion_list;
921 : : /*
922 : : * Completed IOs that need unwritten extents handling and don't have
923 : : * transaction reserved
924 : : */
925 : : atomic_t i_ioend_count; /* Number of outstanding io_end structs */
926 : : atomic_t i_unwritten; /* Nr. of inflight conversions pending */
927 : : struct work_struct i_rsv_conversion_work;
928 : :
929 : : spinlock_t i_block_reservation_lock;
930 : :
931 : : /*
932 : : * Transactions that contain inode's metadata needed to complete
933 : : * fsync and fdatasync, respectively.
934 : : */
935 : : tid_t i_sync_tid;
936 : : tid_t i_datasync_tid;
937 : :
938 : : /* Precomputed uuid+inum+igen checksum for seeding inode checksums */
939 : : __u32 i_csum_seed;
940 : : };
941 : :
942 : : /*
943 : : * File system states
944 : : */
945 : : #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */
946 : : #define EXT4_ERROR_FS 0x0002 /* Errors detected */
947 : : #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */
948 : :
949 : : /*
950 : : * Misc. filesystem flags
951 : : */
952 : : #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */
953 : : #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */
954 : : #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */
955 : :
956 : : /*
957 : : * Mount flags set via mount options or defaults
958 : : */
959 : : #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */
960 : : #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */
961 : : #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */
962 : : #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */
963 : : #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */
964 : : #define EXT4_MOUNT_ERRORS_MASK 0x00070
965 : : #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */
966 : : #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/
967 : : #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */
968 : : #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */
969 : : #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */
970 : : #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */
971 : : #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */
972 : : #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */
973 : : #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */
974 : : #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */
975 : : #define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */
976 : : #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */
977 : : #define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */
978 : : #define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */
979 : : #define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */
980 : : #define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000 /* Enable support for dio read nolocking */
981 : : #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */
982 : : #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */
983 : : #define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */
984 : : #define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */
985 : : #define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */
986 : : #define EXT4_MOUNT_DISCARD 0x40000000 /* Issue DISCARD requests */
987 : : #define EXT4_MOUNT_INIT_INODE_TABLE 0x80000000 /* Initialize uninitialized itables */
988 : :
989 : : /*
990 : : * Mount flags set either automatically (could not be set by mount option)
991 : : * based on per file system feature or property or in special cases such as
992 : : * distinguishing between explicit mount option definition and default.
993 : : */
994 : : #define EXT4_MOUNT2_EXPLICIT_DELALLOC 0x00000001 /* User explicitly
995 : : specified delalloc */
996 : : #define EXT4_MOUNT2_STD_GROUP_SIZE 0x00000002 /* We have standard group
997 : : size of blocksize * 8
998 : : blocks */
999 : :
1000 : : #define clear_opt(sb, opt) EXT4_SB(sb)->s_mount_opt &= \
1001 : : ~EXT4_MOUNT_##opt
1002 : : #define set_opt(sb, opt) EXT4_SB(sb)->s_mount_opt |= \
1003 : : EXT4_MOUNT_##opt
1004 : : #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \
1005 : : EXT4_MOUNT_##opt)
1006 : :
1007 : : #define clear_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 &= \
1008 : : ~EXT4_MOUNT2_##opt
1009 : : #define set_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 |= \
1010 : : EXT4_MOUNT2_##opt
1011 : : #define test_opt2(sb, opt) (EXT4_SB(sb)->s_mount_opt2 & \
1012 : : EXT4_MOUNT2_##opt)
1013 : :
1014 : : #define ext4_test_and_set_bit __test_and_set_bit_le
1015 : : #define ext4_set_bit __set_bit_le
1016 : : #define ext4_set_bit_atomic ext2_set_bit_atomic
1017 : : #define ext4_test_and_clear_bit __test_and_clear_bit_le
1018 : : #define ext4_clear_bit __clear_bit_le
1019 : : #define ext4_clear_bit_atomic ext2_clear_bit_atomic
1020 : : #define ext4_test_bit test_bit_le
1021 : : #define ext4_find_next_zero_bit find_next_zero_bit_le
1022 : : #define ext4_find_next_bit find_next_bit_le
1023 : :
1024 : : extern void ext4_set_bits(void *bm, int cur, int len);
1025 : :
1026 : : /*
1027 : : * Maximal mount counts between two filesystem checks
1028 : : */
1029 : : #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
1030 : : #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */
1031 : :
1032 : : /*
1033 : : * Behaviour when detecting errors
1034 : : */
1035 : : #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */
1036 : : #define EXT4_ERRORS_RO 2 /* Remount fs read-only */
1037 : : #define EXT4_ERRORS_PANIC 3 /* Panic */
1038 : : #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE
1039 : :
1040 : : /* Metadata checksum algorithm codes */
1041 : : #define EXT4_CRC32C_CHKSUM 1
1042 : :
1043 : : /*
1044 : : * Structure of the super block
1045 : : */
1046 : : struct ext4_super_block {
1047 : : /*00*/ __le32 s_inodes_count; /* Inodes count */
1048 : : __le32 s_blocks_count_lo; /* Blocks count */
1049 : : __le32 s_r_blocks_count_lo; /* Reserved blocks count */
1050 : : __le32 s_free_blocks_count_lo; /* Free blocks count */
1051 : : /*10*/ __le32 s_free_inodes_count; /* Free inodes count */
1052 : : __le32 s_first_data_block; /* First Data Block */
1053 : : __le32 s_log_block_size; /* Block size */
1054 : : __le32 s_log_cluster_size; /* Allocation cluster size */
1055 : : /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */
1056 : : __le32 s_clusters_per_group; /* # Clusters per group */
1057 : : __le32 s_inodes_per_group; /* # Inodes per group */
1058 : : __le32 s_mtime; /* Mount time */
1059 : : /*30*/ __le32 s_wtime; /* Write time */
1060 : : __le16 s_mnt_count; /* Mount count */
1061 : : __le16 s_max_mnt_count; /* Maximal mount count */
1062 : : __le16 s_magic; /* Magic signature */
1063 : : __le16 s_state; /* File system state */
1064 : : __le16 s_errors; /* Behaviour when detecting errors */
1065 : : __le16 s_minor_rev_level; /* minor revision level */
1066 : : /*40*/ __le32 s_lastcheck; /* time of last check */
1067 : : __le32 s_checkinterval; /* max. time between checks */
1068 : : __le32 s_creator_os; /* OS */
1069 : : __le32 s_rev_level; /* Revision level */
1070 : : /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */
1071 : : __le16 s_def_resgid; /* Default gid for reserved blocks */
1072 : : /*
1073 : : * These fields are for EXT4_DYNAMIC_REV superblocks only.
1074 : : *
1075 : : * Note: the difference between the compatible feature set and
1076 : : * the incompatible feature set is that if there is a bit set
1077 : : * in the incompatible feature set that the kernel doesn't
1078 : : * know about, it should refuse to mount the filesystem.
1079 : : *
1080 : : * e2fsck's requirements are more strict; if it doesn't know
1081 : : * about a feature in either the compatible or incompatible
1082 : : * feature set, it must abort and not try to meddle with
1083 : : * things it doesn't understand...
1084 : : */
1085 : : __le32 s_first_ino; /* First non-reserved inode */
1086 : : __le16 s_inode_size; /* size of inode structure */
1087 : : __le16 s_block_group_nr; /* block group # of this superblock */
1088 : : __le32 s_feature_compat; /* compatible feature set */
1089 : : /*60*/ __le32 s_feature_incompat; /* incompatible feature set */
1090 : : __le32 s_feature_ro_compat; /* readonly-compatible feature set */
1091 : : /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */
1092 : : /*78*/ char s_volume_name[16]; /* volume name */
1093 : : /*88*/ char s_last_mounted[64]; /* directory where last mounted */
1094 : : /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */
1095 : : /*
1096 : : * Performance hints. Directory preallocation should only
1097 : : * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
1098 : : */
1099 : : __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/
1100 : : __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */
1101 : : __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */
1102 : : /*
1103 : : * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
1104 : : */
1105 : : /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */
1106 : : /*E0*/ __le32 s_journal_inum; /* inode number of journal file */
1107 : : __le32 s_journal_dev; /* device number of journal file */
1108 : : __le32 s_last_orphan; /* start of list of inodes to delete */
1109 : : __le32 s_hash_seed[4]; /* HTREE hash seed */
1110 : : __u8 s_def_hash_version; /* Default hash version to use */
1111 : : __u8 s_jnl_backup_type;
1112 : : __le16 s_desc_size; /* size of group descriptor */
1113 : : /*100*/ __le32 s_default_mount_opts;
1114 : : __le32 s_first_meta_bg; /* First metablock block group */
1115 : : __le32 s_mkfs_time; /* When the filesystem was created */
1116 : : __le32 s_jnl_blocks[17]; /* Backup of the journal inode */
1117 : : /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
1118 : : /*150*/ __le32 s_blocks_count_hi; /* Blocks count */
1119 : : __le32 s_r_blocks_count_hi; /* Reserved blocks count */
1120 : : __le32 s_free_blocks_count_hi; /* Free blocks count */
1121 : : __le16 s_min_extra_isize; /* All inodes have at least # bytes */
1122 : : __le16 s_want_extra_isize; /* New inodes should reserve # bytes */
1123 : : __le32 s_flags; /* Miscellaneous flags */
1124 : : __le16 s_raid_stride; /* RAID stride */
1125 : : __le16 s_mmp_update_interval; /* # seconds to wait in MMP checking */
1126 : : __le64 s_mmp_block; /* Block for multi-mount protection */
1127 : : __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/
1128 : : __u8 s_log_groups_per_flex; /* FLEX_BG group size */
1129 : : __u8 s_checksum_type; /* metadata checksum algorithm used */
1130 : : __le16 s_reserved_pad;
1131 : : __le64 s_kbytes_written; /* nr of lifetime kilobytes written */
1132 : : __le32 s_snapshot_inum; /* Inode number of active snapshot */
1133 : : __le32 s_snapshot_id; /* sequential ID of active snapshot */
1134 : : __le64 s_snapshot_r_blocks_count; /* reserved blocks for active
1135 : : snapshot's future use */
1136 : : __le32 s_snapshot_list; /* inode number of the head of the
1137 : : on-disk snapshot list */
1138 : : #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count)
1139 : : __le32 s_error_count; /* number of fs errors */
1140 : : __le32 s_first_error_time; /* first time an error happened */
1141 : : __le32 s_first_error_ino; /* inode involved in first error */
1142 : : __le64 s_first_error_block; /* block involved of first error */
1143 : : __u8 s_first_error_func[32]; /* function where the error happened */
1144 : : __le32 s_first_error_line; /* line number where error happened */
1145 : : __le32 s_last_error_time; /* most recent time of an error */
1146 : : __le32 s_last_error_ino; /* inode involved in last error */
1147 : : __le32 s_last_error_line; /* line number where error happened */
1148 : : __le64 s_last_error_block; /* block involved of last error */
1149 : : __u8 s_last_error_func[32]; /* function where the error happened */
1150 : : #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts)
1151 : : __u8 s_mount_opts[64];
1152 : : __le32 s_usr_quota_inum; /* inode for tracking user quota */
1153 : : __le32 s_grp_quota_inum; /* inode for tracking group quota */
1154 : : __le32 s_overhead_clusters; /* overhead blocks/clusters in fs */
1155 : : __le32 s_reserved[108]; /* Padding to the end of the block */
1156 : : __le32 s_checksum; /* crc32c(superblock) */
1157 : : };
1158 : :
1159 : : #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START)
1160 : :
1161 : : #ifdef __KERNEL__
1162 : :
1163 : : /*
1164 : : * run-time mount flags
1165 : : */
1166 : : #define EXT4_MF_MNTDIR_SAMPLED 0x0001
1167 : : #define EXT4_MF_FS_ABORTED 0x0002 /* Fatal error detected */
1168 : :
1169 : : /*
1170 : : * fourth extended-fs super-block data in memory
1171 : : */
1172 : : struct ext4_sb_info {
1173 : : unsigned long s_desc_size; /* Size of a group descriptor in bytes */
1174 : : unsigned long s_inodes_per_block;/* Number of inodes per block */
1175 : : unsigned long s_blocks_per_group;/* Number of blocks in a group */
1176 : : unsigned long s_clusters_per_group; /* Number of clusters in a group */
1177 : : unsigned long s_inodes_per_group;/* Number of inodes in a group */
1178 : : unsigned long s_itb_per_group; /* Number of inode table blocks per group */
1179 : : unsigned long s_gdb_count; /* Number of group descriptor blocks */
1180 : : unsigned long s_desc_per_block; /* Number of group descriptors per block */
1181 : : ext4_group_t s_groups_count; /* Number of groups in the fs */
1182 : : ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */
1183 : : unsigned long s_overhead; /* # of fs overhead clusters */
1184 : : unsigned int s_cluster_ratio; /* Number of blocks per cluster */
1185 : : unsigned int s_cluster_bits; /* log2 of s_cluster_ratio */
1186 : : loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */
1187 : : struct buffer_head * s_sbh; /* Buffer containing the super block */
1188 : : struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */
1189 : : struct buffer_head **s_group_desc;
1190 : : unsigned int s_mount_opt;
1191 : : unsigned int s_mount_opt2;
1192 : : unsigned int s_mount_flags;
1193 : : unsigned int s_def_mount_opt;
1194 : : ext4_fsblk_t s_sb_block;
1195 : : atomic64_t s_resv_clusters;
1196 : : kuid_t s_resuid;
1197 : : kgid_t s_resgid;
1198 : : unsigned short s_mount_state;
1199 : : unsigned short s_pad;
1200 : : int s_addr_per_block_bits;
1201 : : int s_desc_per_block_bits;
1202 : : int s_inode_size;
1203 : : int s_first_ino;
1204 : : unsigned int s_inode_readahead_blks;
1205 : : unsigned int s_inode_goal;
1206 : : spinlock_t s_next_gen_lock;
1207 : : u32 s_next_generation;
1208 : : u32 s_hash_seed[4];
1209 : : int s_def_hash_version;
1210 : : int s_hash_unsigned; /* 3 if hash should be signed, 0 if not */
1211 : : struct percpu_counter s_freeclusters_counter;
1212 : : struct percpu_counter s_freeinodes_counter;
1213 : : struct percpu_counter s_dirs_counter;
1214 : : struct percpu_counter s_dirtyclusters_counter;
1215 : : struct blockgroup_lock *s_blockgroup_lock;
1216 : : struct proc_dir_entry *s_proc;
1217 : : struct kobject s_kobj;
1218 : : struct completion s_kobj_unregister;
1219 : : struct super_block *s_sb;
1220 : :
1221 : : /* Journaling */
1222 : : struct journal_s *s_journal;
1223 : : struct list_head s_orphan;
1224 : : struct mutex s_orphan_lock;
1225 : : unsigned long s_resize_flags; /* Flags indicating if there
1226 : : is a resizer */
1227 : : unsigned long s_commit_interval;
1228 : : u32 s_max_batch_time;
1229 : : u32 s_min_batch_time;
1230 : : struct block_device *journal_bdev;
1231 : : #ifdef CONFIG_QUOTA
1232 : : char *s_qf_names[MAXQUOTAS]; /* Names of quota files with journalled quota */
1233 : : int s_jquota_fmt; /* Format of quota to use */
1234 : : #endif
1235 : : unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */
1236 : : struct rb_root system_blks;
1237 : :
1238 : : #ifdef EXTENTS_STATS
1239 : : /* ext4 extents stats */
1240 : : unsigned long s_ext_min;
1241 : : unsigned long s_ext_max;
1242 : : unsigned long s_depth_max;
1243 : : spinlock_t s_ext_stats_lock;
1244 : : unsigned long s_ext_blocks;
1245 : : unsigned long s_ext_extents;
1246 : : #endif
1247 : :
1248 : : /* for buddy allocator */
1249 : : struct ext4_group_info ***s_group_info;
1250 : : struct inode *s_buddy_cache;
1251 : : spinlock_t s_md_lock;
1252 : : unsigned short *s_mb_offsets;
1253 : : unsigned int *s_mb_maxs;
1254 : : unsigned int s_group_info_size;
1255 : :
1256 : : /* tunables */
1257 : : unsigned long s_stripe;
1258 : : unsigned int s_mb_stream_request;
1259 : : unsigned int s_mb_max_to_scan;
1260 : : unsigned int s_mb_min_to_scan;
1261 : : unsigned int s_mb_stats;
1262 : : unsigned int s_mb_order2_reqs;
1263 : : unsigned int s_mb_group_prealloc;
1264 : : unsigned int s_max_dir_size_kb;
1265 : : /* where last allocation was done - for stream allocation */
1266 : : unsigned long s_mb_last_group;
1267 : : unsigned long s_mb_last_start;
1268 : :
1269 : : /* stats for buddy allocator */
1270 : : atomic_t s_bal_reqs; /* number of reqs with len > 1 */
1271 : : atomic_t s_bal_success; /* we found long enough chunks */
1272 : : atomic_t s_bal_allocated; /* in blocks */
1273 : : atomic_t s_bal_ex_scanned; /* total extents scanned */
1274 : : atomic_t s_bal_goals; /* goal hits */
1275 : : atomic_t s_bal_breaks; /* too long searches */
1276 : : atomic_t s_bal_2orders; /* 2^order hits */
1277 : : spinlock_t s_bal_lock;
1278 : : unsigned long s_mb_buddies_generated;
1279 : : unsigned long long s_mb_generation_time;
1280 : : atomic_t s_mb_lost_chunks;
1281 : : atomic_t s_mb_preallocated;
1282 : : atomic_t s_mb_discarded;
1283 : : atomic_t s_lock_busy;
1284 : :
1285 : : /* locality groups */
1286 : : struct ext4_locality_group __percpu *s_locality_groups;
1287 : :
1288 : : /* for write statistics */
1289 : : unsigned long s_sectors_written_start;
1290 : : u64 s_kbytes_written;
1291 : :
1292 : : /* the size of zero-out chunk */
1293 : : unsigned int s_extent_max_zeroout_kb;
1294 : :
1295 : : unsigned int s_log_groups_per_flex;
1296 : : struct flex_groups *s_flex_groups;
1297 : : ext4_group_t s_flex_groups_allocated;
1298 : :
1299 : : /* workqueue for reserved extent conversions (buffered io) */
1300 : : struct workqueue_struct *rsv_conversion_wq;
1301 : :
1302 : : /* timer for periodic error stats printing */
1303 : : struct timer_list s_err_report;
1304 : :
1305 : : /* Lazy inode table initialization info */
1306 : : struct ext4_li_request *s_li_request;
1307 : : /* Wait multiplier for lazy initialization thread */
1308 : : unsigned int s_li_wait_mult;
1309 : :
1310 : : /* Kernel thread for multiple mount protection */
1311 : : struct task_struct *s_mmp_tsk;
1312 : :
1313 : : /* record the last minlen when FITRIM is called. */
1314 : : atomic_t s_last_trim_minblks;
1315 : :
1316 : : /* Reference to checksum algorithm driver via cryptoapi */
1317 : : struct crypto_shash *s_chksum_driver;
1318 : :
1319 : : /* Precomputed FS UUID checksum for seeding other checksums */
1320 : : __u32 s_csum_seed;
1321 : :
1322 : : /* Reclaim extents from extent status tree */
1323 : : struct shrinker s_es_shrinker;
1324 : : struct list_head s_es_lru;
1325 : : unsigned long s_es_last_sorted;
1326 : : struct percpu_counter s_extent_cache_cnt;
1327 : : spinlock_t s_es_lru_lock ____cacheline_aligned_in_smp;
1328 : :
1329 : : /* Ratelimit ext4 messages. */
1330 : : struct ratelimit_state s_err_ratelimit_state;
1331 : : struct ratelimit_state s_warning_ratelimit_state;
1332 : : struct ratelimit_state s_msg_ratelimit_state;
1333 : : };
1334 : :
1335 : : static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb)
1336 : : {
1337 : : return sb->s_fs_info;
1338 : : }
1339 : : static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
1340 : : {
1341 : : return container_of(inode, struct ext4_inode_info, vfs_inode);
1342 : : }
1343 : :
1344 : : static inline struct timespec ext4_current_time(struct inode *inode)
1345 : : {
1346 [ + - ][ # # ]: 2472078 : return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ?
[ + - ]
[ # # + - ]
[ + - ][ + - ]
[ + - ][ + - ]
[ + - ][ + - ]
[ + - ]
1347 : 0 : current_fs_time(inode->i_sb) : CURRENT_TIME_SEC;
1348 : : }
1349 : :
1350 : 10863218 : static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
1351 : : {
1352 : : return ino == EXT4_ROOT_INO ||
1353 : : ino == EXT4_USR_QUOTA_INO ||
1354 : 10863481 : ino == EXT4_GRP_QUOTA_INO ||
1355 : 10863481 : ino == EXT4_BOOT_LOADER_INO ||
1356 [ + + ][ + - ]: 10863293 : ino == EXT4_JOURNAL_INO ||
1357 [ + + ][ + + ]: 22086509 : ino == EXT4_RESIZE_INO ||
[ + - ][ + - ]
1358 [ # + ][ - + ]: 10863218 : (ino >= EXT4_FIRST_INO(sb) &&
1359 : 10862920 : ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
1360 : : }
1361 : :
1362 : : static inline void ext4_set_io_unwritten_flag(struct inode *inode,
1363 : : struct ext4_io_end *io_end)
1364 : : {
1365 [ # # ][ # # ]: 0 : if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) {
1366 : 0 : io_end->flag |= EXT4_IO_END_UNWRITTEN;
1367 : 0 : atomic_inc(&EXT4_I(inode)->i_unwritten);
1368 : : }
1369 : : }
1370 : :
1371 : : static inline ext4_io_end_t *ext4_inode_aio(struct inode *inode)
1372 : : {
1373 : : return inode->i_private;
1374 : : }
1375 : :
1376 : : static inline void ext4_inode_aio_set(struct inode *inode, ext4_io_end_t *io)
1377 : : {
1378 : 0 : inode->i_private = io;
1379 : : }
1380 : :
1381 : : /*
1382 : : * Inode dynamic state flags
1383 : : */
1384 : : enum {
1385 : : EXT4_STATE_JDATA, /* journaled data exists */
1386 : : EXT4_STATE_NEW, /* inode is newly created */
1387 : : EXT4_STATE_XATTR, /* has in-inode xattrs */
1388 : : EXT4_STATE_NO_EXPAND, /* No space for expansion */
1389 : : EXT4_STATE_DA_ALLOC_CLOSE, /* Alloc DA blks on close */
1390 : : EXT4_STATE_EXT_MIGRATE, /* Inode is migrating */
1391 : : EXT4_STATE_DIO_UNWRITTEN, /* need convert on dio done*/
1392 : : EXT4_STATE_NEWENTRY, /* File just added to dir */
1393 : : EXT4_STATE_DELALLOC_RESERVED, /* blks already reserved for delalloc */
1394 : : EXT4_STATE_DIOREAD_LOCK, /* Disable support for dio read
1395 : : nolocking */
1396 : : EXT4_STATE_MAY_INLINE_DATA, /* may have in-inode data */
1397 : : EXT4_STATE_ORDERED_MODE, /* data=ordered mode */
1398 : : EXT4_STATE_EXT_PRECACHED, /* extents have been precached */
1399 : : };
1400 : :
1401 : : #define EXT4_INODE_BIT_FNS(name, field, offset) \
1402 : : static inline int ext4_test_inode_##name(struct inode *inode, int bit) \
1403 : : { \
1404 : : return test_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
1405 : : } \
1406 : : static inline void ext4_set_inode_##name(struct inode *inode, int bit) \
1407 : : { \
1408 : : set_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
1409 : : } \
1410 : : static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \
1411 : : { \
1412 : : clear_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
1413 : : }
1414 : :
1415 : : /* Add these declarations here only so that these functions can be
1416 : : * found by name. Otherwise, they are very hard to locate. */
1417 : : static inline int ext4_test_inode_flag(struct inode *inode, int bit);
1418 : : static inline void ext4_set_inode_flag(struct inode *inode, int bit);
1419 : : static inline void ext4_clear_inode_flag(struct inode *inode, int bit);
1420 : 11331182 : EXT4_INODE_BIT_FNS(flag, flags, 0)
1421 : :
1422 : : /* Add these declarations here only so that these functions can be
1423 : : * found by name. Otherwise, they are very hard to locate. */
1424 : : static inline int ext4_test_inode_state(struct inode *inode, int bit);
1425 : : static inline void ext4_set_inode_state(struct inode *inode, int bit);
1426 : : static inline void ext4_clear_inode_state(struct inode *inode, int bit);
1427 : : #if (BITS_PER_LONG < 64)
1428 : 11991363 : EXT4_INODE_BIT_FNS(state, state_flags, 0)
1429 : :
1430 : : static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1431 : : {
1432 : 470952 : (ei)->i_state_flags = 0;
1433 : : }
1434 : : #else
1435 : : EXT4_INODE_BIT_FNS(state, flags, 32)
1436 : :
1437 : : static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1438 : : {
1439 : : /* We depend on the fact that callers will set i_flags */
1440 : : }
1441 : : #endif
1442 : : #else
1443 : : /* Assume that user mode programs are passing in an ext4fs superblock, not
1444 : : * a kernel struct super_block. This will allow us to call the feature-test
1445 : : * macros from user land. */
1446 : : #define EXT4_SB(sb) (sb)
1447 : : #endif
1448 : :
1449 : : #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
1450 : :
1451 : : /*
1452 : : * Codes for operating systems
1453 : : */
1454 : : #define EXT4_OS_LINUX 0
1455 : : #define EXT4_OS_HURD 1
1456 : : #define EXT4_OS_MASIX 2
1457 : : #define EXT4_OS_FREEBSD 3
1458 : : #define EXT4_OS_LITES 4
1459 : :
1460 : : /*
1461 : : * Revision levels
1462 : : */
1463 : : #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */
1464 : : #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
1465 : :
1466 : : #define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV
1467 : : #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV
1468 : :
1469 : : #define EXT4_GOOD_OLD_INODE_SIZE 128
1470 : :
1471 : : /*
1472 : : * Feature set definitions
1473 : : */
1474 : :
1475 : : #define EXT4_HAS_COMPAT_FEATURE(sb,mask) \
1476 : : ((EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask)) != 0)
1477 : : #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \
1478 : : ((EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask)) != 0)
1479 : : #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \
1480 : : ((EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask)) != 0)
1481 : : #define EXT4_SET_COMPAT_FEATURE(sb,mask) \
1482 : : EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
1483 : : #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \
1484 : : EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
1485 : : #define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \
1486 : : EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
1487 : : #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \
1488 : : EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
1489 : : #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \
1490 : : EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
1491 : : #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \
1492 : : EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
1493 : :
1494 : : #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001
1495 : : #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002
1496 : : #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004
1497 : : #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008
1498 : : #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010
1499 : : #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020
1500 : :
1501 : : #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
1502 : : #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
1503 : : #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
1504 : : #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008
1505 : : #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010
1506 : : #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020
1507 : : #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040
1508 : : #define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100
1509 : : #define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200
1510 : : /*
1511 : : * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM). When
1512 : : * METADATA_CSUM is set, group descriptor checksums use the same algorithm as
1513 : : * all other data structures' checksums. However, the METADATA_CSUM and
1514 : : * GDT_CSUM bits are mutually exclusive.
1515 : : */
1516 : : #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400
1517 : :
1518 : : #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001
1519 : : #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002
1520 : : #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */
1521 : : #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */
1522 : : #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010
1523 : : #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */
1524 : : #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080
1525 : : #define EXT4_FEATURE_INCOMPAT_MMP 0x0100
1526 : : #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200
1527 : : #define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 /* EA in inode */
1528 : : #define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 /* data in dirent */
1529 : : #define EXT4_FEATURE_INCOMPAT_BG_USE_META_CSUM 0x2000 /* use crc32c for bg */
1530 : : #define EXT4_FEATURE_INCOMPAT_LARGEDIR 0x4000 /* >2GB or 3-lvl htree */
1531 : : #define EXT4_FEATURE_INCOMPAT_INLINE_DATA 0x8000 /* data in inode */
1532 : :
1533 : : #define EXT2_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR
1534 : : #define EXT2_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1535 : : EXT4_FEATURE_INCOMPAT_META_BG)
1536 : : #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1537 : : EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1538 : : EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
1539 : :
1540 : : #define EXT3_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR
1541 : : #define EXT3_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1542 : : EXT4_FEATURE_INCOMPAT_RECOVER| \
1543 : : EXT4_FEATURE_INCOMPAT_META_BG)
1544 : : #define EXT3_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1545 : : EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1546 : : EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
1547 : :
1548 : : #define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR
1549 : : #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1550 : : EXT4_FEATURE_INCOMPAT_RECOVER| \
1551 : : EXT4_FEATURE_INCOMPAT_META_BG| \
1552 : : EXT4_FEATURE_INCOMPAT_EXTENTS| \
1553 : : EXT4_FEATURE_INCOMPAT_64BIT| \
1554 : : EXT4_FEATURE_INCOMPAT_FLEX_BG| \
1555 : : EXT4_FEATURE_INCOMPAT_MMP | \
1556 : : EXT4_FEATURE_INCOMPAT_INLINE_DATA)
1557 : : #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1558 : : EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1559 : : EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
1560 : : EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
1561 : : EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
1562 : : EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
1563 : : EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\
1564 : : EXT4_FEATURE_RO_COMPAT_BIGALLOC |\
1565 : : EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\
1566 : : EXT4_FEATURE_RO_COMPAT_QUOTA)
1567 : :
1568 : : /*
1569 : : * Default values for user and/or group using reserved blocks
1570 : : */
1571 : : #define EXT4_DEF_RESUID 0
1572 : : #define EXT4_DEF_RESGID 0
1573 : :
1574 : : #define EXT4_DEF_INODE_READAHEAD_BLKS 32
1575 : :
1576 : : /*
1577 : : * Default mount options
1578 : : */
1579 : : #define EXT4_DEFM_DEBUG 0x0001
1580 : : #define EXT4_DEFM_BSDGROUPS 0x0002
1581 : : #define EXT4_DEFM_XATTR_USER 0x0004
1582 : : #define EXT4_DEFM_ACL 0x0008
1583 : : #define EXT4_DEFM_UID16 0x0010
1584 : : #define EXT4_DEFM_JMODE 0x0060
1585 : : #define EXT4_DEFM_JMODE_DATA 0x0020
1586 : : #define EXT4_DEFM_JMODE_ORDERED 0x0040
1587 : : #define EXT4_DEFM_JMODE_WBACK 0x0060
1588 : : #define EXT4_DEFM_NOBARRIER 0x0100
1589 : : #define EXT4_DEFM_BLOCK_VALIDITY 0x0200
1590 : : #define EXT4_DEFM_DISCARD 0x0400
1591 : : #define EXT4_DEFM_NODELALLOC 0x0800
1592 : :
1593 : : /*
1594 : : * Default journal batch times
1595 : : */
1596 : : #define EXT4_DEF_MIN_BATCH_TIME 0
1597 : : #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */
1598 : :
1599 : : /*
1600 : : * Minimum number of groups in a flexgroup before we separate out
1601 : : * directories into the first block group of a flexgroup
1602 : : */
1603 : : #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4
1604 : :
1605 : : /*
1606 : : * Structure of a directory entry
1607 : : */
1608 : : #define EXT4_NAME_LEN 255
1609 : :
1610 : : struct ext4_dir_entry {
1611 : : __le32 inode; /* Inode number */
1612 : : __le16 rec_len; /* Directory entry length */
1613 : : __le16 name_len; /* Name length */
1614 : : char name[EXT4_NAME_LEN]; /* File name */
1615 : : };
1616 : :
1617 : : /*
1618 : : * The new version of the directory entry. Since EXT4 structures are
1619 : : * stored in intel byte order, and the name_len field could never be
1620 : : * bigger than 255 chars, it's safe to reclaim the extra byte for the
1621 : : * file_type field.
1622 : : */
1623 : : struct ext4_dir_entry_2 {
1624 : : __le32 inode; /* Inode number */
1625 : : __le16 rec_len; /* Directory entry length */
1626 : : __u8 name_len; /* Name length */
1627 : : __u8 file_type;
1628 : : char name[EXT4_NAME_LEN]; /* File name */
1629 : : };
1630 : :
1631 : : /*
1632 : : * This is a bogus directory entry at the end of each leaf block that
1633 : : * records checksums.
1634 : : */
1635 : : struct ext4_dir_entry_tail {
1636 : : __le32 det_reserved_zero1; /* Pretend to be unused */
1637 : : __le16 det_rec_len; /* 12 */
1638 : : __u8 det_reserved_zero2; /* Zero name length */
1639 : : __u8 det_reserved_ft; /* 0xDE, fake file type */
1640 : : __le32 det_checksum; /* crc32c(uuid+inum+dirblock) */
1641 : : };
1642 : :
1643 : : #define EXT4_DIRENT_TAIL(block, blocksize) \
1644 : : ((struct ext4_dir_entry_tail *)(((void *)(block)) + \
1645 : : ((blocksize) - \
1646 : : sizeof(struct ext4_dir_entry_tail))))
1647 : :
1648 : : /*
1649 : : * Ext4 directory file types. Only the low 3 bits are used. The
1650 : : * other bits are reserved for now.
1651 : : */
1652 : : #define EXT4_FT_UNKNOWN 0
1653 : : #define EXT4_FT_REG_FILE 1
1654 : : #define EXT4_FT_DIR 2
1655 : : #define EXT4_FT_CHRDEV 3
1656 : : #define EXT4_FT_BLKDEV 4
1657 : : #define EXT4_FT_FIFO 5
1658 : : #define EXT4_FT_SOCK 6
1659 : : #define EXT4_FT_SYMLINK 7
1660 : :
1661 : : #define EXT4_FT_MAX 8
1662 : :
1663 : : #define EXT4_FT_DIR_CSUM 0xDE
1664 : :
1665 : : /*
1666 : : * EXT4_DIR_PAD defines the directory entries boundaries
1667 : : *
1668 : : * NOTE: It must be a multiple of 4
1669 : : */
1670 : : #define EXT4_DIR_PAD 4
1671 : : #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1)
1672 : : #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \
1673 : : ~EXT4_DIR_ROUND)
1674 : : #define EXT4_MAX_REC_LEN ((1<<16)-1)
1675 : :
1676 : : /*
1677 : : * If we ever get support for fs block sizes > page_size, we'll need
1678 : : * to remove the #if statements in the next two functions...
1679 : : */
1680 : : static inline unsigned int
1681 : : ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize)
1682 : : {
1683 : 38775278 : unsigned len = le16_to_cpu(dlen);
1684 : :
1685 : : #if (PAGE_CACHE_SIZE >= 65536)
1686 : : if (len == EXT4_MAX_REC_LEN || len == 0)
1687 : : return blocksize;
1688 : : return (len & 65532) | ((len & 3) << 16);
1689 : : #else
1690 : : return len;
1691 : : #endif
1692 : : }
1693 : :
1694 : : static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize)
1695 : : {
1696 [ - + ][ + - ]: 1037377 : if ((len > blocksize) || (blocksize > (1 << 18)) || (len & 3))
[ - + ][ # # ]
[ + - ]
[ - + # # ]
[ # # ][ # # ]
[ # # ][ + - ]
[ - + ][ + - ]
[ - + ][ + - ]
[ + ]
[ - + + - ]
[ - + ][ + - ]
[ - + ][ + ]
[ - + # # ]
1697 : 0 : BUG();
1698 : : #if (PAGE_CACHE_SIZE >= 65536)
1699 : : if (len < 65536)
1700 : : return cpu_to_le16(len);
1701 : : if (len == blocksize) {
1702 : : if (blocksize == 65536)
1703 : : return cpu_to_le16(EXT4_MAX_REC_LEN);
1704 : : else
1705 : : return cpu_to_le16(0);
1706 : : }
1707 : : return cpu_to_le16((len & 65532) | ((len >> 16) & 3));
1708 : : #else
1709 : 1470581 : return cpu_to_le16(len);
1710 : : #endif
1711 : : }
1712 : :
1713 : : /*
1714 : : * Hash Tree Directory indexing
1715 : : * (c) Daniel Phillips, 2001
1716 : : */
1717 : :
1718 : : #define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \
1719 : : EXT4_FEATURE_COMPAT_DIR_INDEX) && \
1720 : : ext4_test_inode_flag((dir), EXT4_INODE_INDEX))
1721 : : #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX)
1722 : : #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
1723 : :
1724 : : /* Legal values for the dx_root hash_version field: */
1725 : :
1726 : : #define DX_HASH_LEGACY 0
1727 : : #define DX_HASH_HALF_MD4 1
1728 : : #define DX_HASH_TEA 2
1729 : : #define DX_HASH_LEGACY_UNSIGNED 3
1730 : : #define DX_HASH_HALF_MD4_UNSIGNED 4
1731 : : #define DX_HASH_TEA_UNSIGNED 5
1732 : :
1733 : : static inline u32 ext4_chksum(struct ext4_sb_info *sbi, u32 crc,
1734 : : const void *address, unsigned int length)
1735 : : {
1736 : : struct {
1737 : : struct shash_desc shash;
1738 : : char ctx[4];
1739 : : } desc;
1740 : : int err;
1741 : :
1742 [ # # ][ # # ]: 0 : BUG_ON(crypto_shash_descsize(sbi->s_chksum_driver)!=sizeof(desc.ctx));
[ # # ][ # # ]
1743 : :
1744 : 0 : desc.shash.tfm = sbi->s_chksum_driver;
1745 : 0 : desc.shash.flags = 0;
1746 : 0 : *(u32 *)desc.ctx = crc;
1747 : :
1748 : 0 : err = crypto_shash_update(&desc.shash, address, length);
1749 [ # # ][ # # ]: 148 : BUG_ON(err);
[ # # ][ - + ]
1750 : :
1751 : 0 : return *(u32 *)desc.ctx;
1752 : : }
1753 : :
1754 : : #ifdef __KERNEL__
1755 : :
1756 : : /* hash info structure used by the directory hash */
1757 : : struct dx_hash_info
1758 : : {
1759 : : u32 hash;
1760 : : u32 minor_hash;
1761 : : int hash_version;
1762 : : u32 *seed;
1763 : : };
1764 : :
1765 : :
1766 : : /* 32 and 64 bit signed EOF for dx directories */
1767 : : #define EXT4_HTREE_EOF_32BIT ((1UL << (32 - 1)) - 1)
1768 : : #define EXT4_HTREE_EOF_64BIT ((1ULL << (64 - 1)) - 1)
1769 : :
1770 : :
1771 : : /*
1772 : : * Control parameters used by ext4_htree_next_block
1773 : : */
1774 : : #define HASH_NB_ALWAYS 1
1775 : :
1776 : :
1777 : : /*
1778 : : * Describe an inode's exact location on disk and in memory
1779 : : */
1780 : : struct ext4_iloc
1781 : : {
1782 : : struct buffer_head *bh;
1783 : : unsigned long offset;
1784 : : ext4_group_t block_group;
1785 : : };
1786 : :
1787 : : static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
1788 : : {
1789 : 10855934 : return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
1790 : : }
1791 : :
1792 : : /*
1793 : : * This structure is stuffed into the struct file's private_data field
1794 : : * for directories. It is where we put information so that we can do
1795 : : * readdir operations in hash tree order.
1796 : : */
1797 : : struct dir_private_info {
1798 : : struct rb_root root;
1799 : : struct rb_node *curr_node;
1800 : : struct fname *extra_fname;
1801 : : loff_t last_pos;
1802 : : __u32 curr_hash;
1803 : : __u32 curr_minor_hash;
1804 : : __u32 next_hash;
1805 : : };
1806 : :
1807 : : /* calculate the first block number of the group */
1808 : : static inline ext4_fsblk_t
1809 : 422844 : ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no)
1810 : : {
1811 : 1404252 : return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
1812 : 490704 : le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
1813 : : }
1814 : :
1815 : : /*
1816 : : * Special error return code only used by dx_probe() and its callers.
1817 : : */
1818 : : #define ERR_BAD_DX_DIR -75000
1819 : :
1820 : : /*
1821 : : * Timeout and state flag for lazy initialization inode thread.
1822 : : */
1823 : : #define EXT4_DEF_LI_WAIT_MULT 10
1824 : : #define EXT4_DEF_LI_MAX_START_DELAY 5
1825 : : #define EXT4_LAZYINIT_QUIT 0x0001
1826 : : #define EXT4_LAZYINIT_RUNNING 0x0002
1827 : :
1828 : : /*
1829 : : * Lazy inode table initialization info
1830 : : */
1831 : : struct ext4_lazy_init {
1832 : : unsigned long li_state;
1833 : : struct list_head li_request_list;
1834 : : struct mutex li_list_mtx;
1835 : : };
1836 : :
1837 : : struct ext4_li_request {
1838 : : struct super_block *lr_super;
1839 : : struct ext4_sb_info *lr_sbi;
1840 : : ext4_group_t lr_next_group;
1841 : : struct list_head lr_request;
1842 : : unsigned long lr_next_sched;
1843 : : unsigned long lr_timeout;
1844 : : };
1845 : :
1846 : : struct ext4_features {
1847 : : struct kobject f_kobj;
1848 : : struct completion f_kobj_unregister;
1849 : : };
1850 : :
1851 : : /*
1852 : : * This structure will be used for multiple mount protection. It will be
1853 : : * written into the block number saved in the s_mmp_block field in the
1854 : : * superblock. Programs that check MMP should assume that if
1855 : : * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe
1856 : : * to use the filesystem, regardless of how old the timestamp is.
1857 : : */
1858 : : #define EXT4_MMP_MAGIC 0x004D4D50U /* ASCII for MMP */
1859 : : #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */
1860 : : #define EXT4_MMP_SEQ_FSCK 0xE24D4D50U /* mmp_seq value when being fscked */
1861 : : #define EXT4_MMP_SEQ_MAX 0xE24D4D4FU /* maximum valid mmp_seq value */
1862 : :
1863 : : struct mmp_struct {
1864 : : __le32 mmp_magic; /* Magic number for MMP */
1865 : : __le32 mmp_seq; /* Sequence no. updated periodically */
1866 : :
1867 : : /*
1868 : : * mmp_time, mmp_nodename & mmp_bdevname are only used for information
1869 : : * purposes and do not affect the correctness of the algorithm
1870 : : */
1871 : : __le64 mmp_time; /* Time last updated */
1872 : : char mmp_nodename[64]; /* Node which last updated MMP block */
1873 : : char mmp_bdevname[32]; /* Bdev which last updated MMP block */
1874 : :
1875 : : /*
1876 : : * mmp_check_interval is used to verify if the MMP block has been
1877 : : * updated on the block device. The value is updated based on the
1878 : : * maximum time to write the MMP block during an update cycle.
1879 : : */
1880 : : __le16 mmp_check_interval;
1881 : :
1882 : : __le16 mmp_pad1;
1883 : : __le32 mmp_pad2[226];
1884 : : __le32 mmp_checksum; /* crc32c(uuid+mmp_block) */
1885 : : };
1886 : :
1887 : : /* arguments passed to the mmp thread */
1888 : : struct mmpd_data {
1889 : : struct buffer_head *bh; /* bh from initial read_mmp_block() */
1890 : : struct super_block *sb; /* super block of the fs */
1891 : : };
1892 : :
1893 : : /*
1894 : : * Check interval multiplier
1895 : : * The MMP block is written every update interval and initially checked every
1896 : : * update interval x the multiplier (the value is then adapted based on the
1897 : : * write latency). The reason is that writes can be delayed under load and we
1898 : : * don't want readers to incorrectly assume that the filesystem is no longer
1899 : : * in use.
1900 : : */
1901 : : #define EXT4_MMP_CHECK_MULT 2UL
1902 : :
1903 : : /*
1904 : : * Minimum interval for MMP checking in seconds.
1905 : : */
1906 : : #define EXT4_MMP_MIN_CHECK_INTERVAL 5UL
1907 : :
1908 : : /*
1909 : : * Maximum interval for MMP checking in seconds.
1910 : : */
1911 : : #define EXT4_MMP_MAX_CHECK_INTERVAL 300UL
1912 : :
1913 : : /*
1914 : : * Function prototypes
1915 : : */
1916 : :
1917 : : /*
1918 : : * Ok, these declarations are also in <linux/kernel.h> but none of the
1919 : : * ext4 source programs needs to include it so they are duplicated here.
1920 : : */
1921 : : # define NORET_TYPE /**/
1922 : : # define ATTRIB_NORET __attribute__((noreturn))
1923 : : # define NORET_AND noreturn,
1924 : :
1925 : : /* bitmap.c */
1926 : : extern unsigned int ext4_count_free(char *bitmap, unsigned numchars);
1927 : : void ext4_inode_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
1928 : : struct ext4_group_desc *gdp,
1929 : : struct buffer_head *bh, int sz);
1930 : : int ext4_inode_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
1931 : : struct ext4_group_desc *gdp,
1932 : : struct buffer_head *bh, int sz);
1933 : : void ext4_block_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
1934 : : struct ext4_group_desc *gdp,
1935 : : struct buffer_head *bh);
1936 : : int ext4_block_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
1937 : : struct ext4_group_desc *gdp,
1938 : : struct buffer_head *bh);
1939 : :
1940 : : /* balloc.c */
1941 : : extern void ext4_get_group_no_and_offset(struct super_block *sb,
1942 : : ext4_fsblk_t blocknr,
1943 : : ext4_group_t *blockgrpp,
1944 : : ext4_grpblk_t *offsetp);
1945 : : extern ext4_group_t ext4_get_group_number(struct super_block *sb,
1946 : : ext4_fsblk_t block);
1947 : :
1948 : : extern void ext4_validate_block_bitmap(struct super_block *sb,
1949 : : struct ext4_group_desc *desc,
1950 : : ext4_group_t block_group,
1951 : : struct buffer_head *bh);
1952 : : extern unsigned int ext4_block_group(struct super_block *sb,
1953 : : ext4_fsblk_t blocknr);
1954 : : extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb,
1955 : : ext4_fsblk_t blocknr);
1956 : : extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group);
1957 : : extern unsigned long ext4_bg_num_gdb(struct super_block *sb,
1958 : : ext4_group_t group);
1959 : : extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,
1960 : : ext4_fsblk_t goal,
1961 : : unsigned int flags,
1962 : : unsigned long *count,
1963 : : int *errp);
1964 : : extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi,
1965 : : s64 nclusters, unsigned int flags);
1966 : : extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *);
1967 : : extern void ext4_check_blocks_bitmap(struct super_block *);
1968 : : extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
1969 : : ext4_group_t block_group,
1970 : : struct buffer_head ** bh);
1971 : : extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
1972 : :
1973 : : extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb,
1974 : : ext4_group_t block_group);
1975 : : extern int ext4_wait_block_bitmap(struct super_block *sb,
1976 : : ext4_group_t block_group,
1977 : : struct buffer_head *bh);
1978 : : extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb,
1979 : : ext4_group_t block_group);
1980 : : extern void ext4_init_block_bitmap(struct super_block *sb,
1981 : : struct buffer_head *bh,
1982 : : ext4_group_t group,
1983 : : struct ext4_group_desc *desc);
1984 : : extern unsigned ext4_free_clusters_after_init(struct super_block *sb,
1985 : : ext4_group_t block_group,
1986 : : struct ext4_group_desc *gdp);
1987 : : extern unsigned ext4_num_overhead_clusters(struct super_block *sb,
1988 : : ext4_group_t block_group,
1989 : : struct ext4_group_desc *gdp);
1990 : : ext4_fsblk_t ext4_inode_to_goal_block(struct inode *);
1991 : :
1992 : : /* dir.c */
1993 : : extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *,
1994 : : struct file *,
1995 : : struct ext4_dir_entry_2 *,
1996 : : struct buffer_head *, char *, int,
1997 : : unsigned int);
1998 : : #define ext4_check_dir_entry(dir, filp, de, bh, buf, size, offset) \
1999 : : unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \
2000 : : (de), (bh), (buf), (size), (offset)))
2001 : : extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
2002 : : __u32 minor_hash,
2003 : : struct ext4_dir_entry_2 *dirent);
2004 : : extern void ext4_htree_free_dir_info(struct dir_private_info *p);
2005 : : extern int ext4_find_dest_de(struct inode *dir, struct inode *inode,
2006 : : struct buffer_head *bh,
2007 : : void *buf, int buf_size,
2008 : : const char *name, int namelen,
2009 : : struct ext4_dir_entry_2 **dest_de);
2010 : : void ext4_insert_dentry(struct inode *inode,
2011 : : struct ext4_dir_entry_2 *de,
2012 : : int buf_size,
2013 : : const char *name, int namelen);
2014 : : static inline void ext4_update_dx_flag(struct inode *inode)
2015 : : {
2016 [ - + - + ]: 984605 : if (!EXT4_HAS_COMPAT_FEATURE(inode->i_sb,
[ - + - +
- + ][ - + ]
2017 : : EXT4_FEATURE_COMPAT_DIR_INDEX))
2018 : : ext4_clear_inode_flag(inode, EXT4_INODE_INDEX);
2019 : : }
2020 : : static unsigned char ext4_filetype_table[] = {
2021 : : DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK
2022 : : };
2023 : :
2024 : 327106 : static inline unsigned char get_dtype(struct super_block *sb, int filetype)
2025 : : {
2026 [ + # ][ + # ]: 327106 : if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FILETYPE) ||
[ # # ][ # # ]
2027 : : (filetype >= EXT4_FT_MAX))
2028 : : return DT_UNKNOWN;
2029 : :
2030 : 327108 : return ext4_filetype_table[filetype];
2031 : : }
2032 : :
2033 : : /* fsync.c */
2034 : : extern int ext4_sync_file(struct file *, loff_t, loff_t, int);
2035 : :
2036 : : /* hash.c */
2037 : : extern int ext4fs_dirhash(const char *name, int len, struct
2038 : : dx_hash_info *hinfo);
2039 : :
2040 : : /* ialloc.c */
2041 : : extern struct inode *__ext4_new_inode(handle_t *, struct inode *, umode_t,
2042 : : const struct qstr *qstr, __u32 goal,
2043 : : uid_t *owner, int handle_type,
2044 : : unsigned int line_no, int nblocks);
2045 : :
2046 : : #define ext4_new_inode(handle, dir, mode, qstr, goal, owner) \
2047 : : __ext4_new_inode((handle), (dir), (mode), (qstr), (goal), (owner), \
2048 : : 0, 0, 0)
2049 : : #define ext4_new_inode_start_handle(dir, mode, qstr, goal, owner, \
2050 : : type, nblocks) \
2051 : : __ext4_new_inode(NULL, (dir), (mode), (qstr), (goal), (owner), \
2052 : : (type), __LINE__, (nblocks))
2053 : :
2054 : :
2055 : : extern void ext4_free_inode(handle_t *, struct inode *);
2056 : : extern struct inode * ext4_orphan_get(struct super_block *, unsigned long);
2057 : : extern unsigned long ext4_count_free_inodes(struct super_block *);
2058 : : extern unsigned long ext4_count_dirs(struct super_block *);
2059 : : extern void ext4_check_inodes_bitmap(struct super_block *);
2060 : : extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap);
2061 : : extern int ext4_init_inode_table(struct super_block *sb,
2062 : : ext4_group_t group, int barrier);
2063 : : extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate);
2064 : :
2065 : : /* mballoc.c */
2066 : : extern long ext4_mb_stats;
2067 : : extern long ext4_mb_max_to_scan;
2068 : : extern int ext4_mb_init(struct super_block *);
2069 : : extern int ext4_mb_release(struct super_block *);
2070 : : extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *,
2071 : : struct ext4_allocation_request *, int *);
2072 : : extern int ext4_mb_reserve_blocks(struct super_block *, int);
2073 : : extern void ext4_discard_preallocations(struct inode *);
2074 : : extern int __init ext4_init_mballoc(void);
2075 : : extern void ext4_exit_mballoc(void);
2076 : : extern void ext4_free_blocks(handle_t *handle, struct inode *inode,
2077 : : struct buffer_head *bh, ext4_fsblk_t block,
2078 : : unsigned long count, int flags);
2079 : : extern int ext4_mb_alloc_groupinfo(struct super_block *sb,
2080 : : ext4_group_t ngroups);
2081 : : extern int ext4_mb_add_groupinfo(struct super_block *sb,
2082 : : ext4_group_t i, struct ext4_group_desc *desc);
2083 : : extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb,
2084 : : ext4_fsblk_t block, unsigned long count);
2085 : : extern int ext4_trim_fs(struct super_block *, struct fstrim_range *);
2086 : :
2087 : : /* inode.c */
2088 : : struct buffer_head *ext4_getblk(handle_t *, struct inode *,
2089 : : ext4_lblk_t, int, int *);
2090 : : struct buffer_head *ext4_bread(handle_t *, struct inode *,
2091 : : ext4_lblk_t, int, int *);
2092 : : int ext4_get_block_write(struct inode *inode, sector_t iblock,
2093 : : struct buffer_head *bh_result, int create);
2094 : : int ext4_get_block(struct inode *inode, sector_t iblock,
2095 : : struct buffer_head *bh_result, int create);
2096 : : int ext4_da_get_block_prep(struct inode *inode, sector_t iblock,
2097 : : struct buffer_head *bh, int create);
2098 : : int ext4_walk_page_buffers(handle_t *handle,
2099 : : struct buffer_head *head,
2100 : : unsigned from,
2101 : : unsigned to,
2102 : : int *partial,
2103 : : int (*fn)(handle_t *handle,
2104 : : struct buffer_head *bh));
2105 : : int do_journal_get_write_access(handle_t *handle,
2106 : : struct buffer_head *bh);
2107 : : #define FALL_BACK_TO_NONDELALLOC 1
2108 : : #define CONVERT_INLINE_DATA 2
2109 : :
2110 : : extern struct inode *ext4_iget(struct super_block *, unsigned long);
2111 : : extern int ext4_write_inode(struct inode *, struct writeback_control *);
2112 : : extern int ext4_setattr(struct dentry *, struct iattr *);
2113 : : extern int ext4_getattr(struct vfsmount *mnt, struct dentry *dentry,
2114 : : struct kstat *stat);
2115 : : extern void ext4_evict_inode(struct inode *);
2116 : : extern void ext4_clear_inode(struct inode *);
2117 : : extern int ext4_sync_inode(handle_t *, struct inode *);
2118 : : extern void ext4_dirty_inode(struct inode *, int);
2119 : : extern int ext4_change_inode_journal_flag(struct inode *, int);
2120 : : extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
2121 : : extern int ext4_inode_attach_jinode(struct inode *inode);
2122 : : extern int ext4_can_truncate(struct inode *inode);
2123 : : extern void ext4_truncate(struct inode *);
2124 : : extern int ext4_punch_hole(struct inode *inode, loff_t offset, loff_t length);
2125 : : extern int ext4_truncate_restart_trans(handle_t *, struct inode *, int nblocks);
2126 : : extern void ext4_set_inode_flags(struct inode *);
2127 : : extern void ext4_get_inode_flags(struct ext4_inode_info *);
2128 : : extern int ext4_alloc_da_blocks(struct inode *inode);
2129 : : extern void ext4_set_aops(struct inode *inode);
2130 : : extern int ext4_writepage_trans_blocks(struct inode *);
2131 : : extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks);
2132 : : extern int ext4_block_truncate_page(handle_t *handle,
2133 : : struct address_space *mapping, loff_t from);
2134 : : extern int ext4_block_zero_page_range(handle_t *handle,
2135 : : struct address_space *mapping, loff_t from, loff_t length);
2136 : : extern int ext4_zero_partial_blocks(handle_t *handle, struct inode *inode,
2137 : : loff_t lstart, loff_t lend);
2138 : : extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf);
2139 : : extern qsize_t *ext4_get_reserved_space(struct inode *inode);
2140 : : extern void ext4_da_update_reserve_space(struct inode *inode,
2141 : : int used, int quota_claim);
2142 : :
2143 : : /* indirect.c */
2144 : : extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode,
2145 : : struct ext4_map_blocks *map, int flags);
2146 : : extern ssize_t ext4_ind_direct_IO(int rw, struct kiocb *iocb,
2147 : : const struct iovec *iov, loff_t offset,
2148 : : unsigned long nr_segs);
2149 : : extern int ext4_ind_calc_metadata_amount(struct inode *inode, sector_t lblock);
2150 : : extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks);
2151 : : extern void ext4_ind_truncate(handle_t *, struct inode *inode);
2152 : : extern int ext4_free_hole_blocks(handle_t *handle, struct inode *inode,
2153 : : ext4_lblk_t first, ext4_lblk_t stop);
2154 : :
2155 : : /* ioctl.c */
2156 : : extern long ext4_ioctl(struct file *, unsigned int, unsigned long);
2157 : : extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long);
2158 : :
2159 : : /* migrate.c */
2160 : : extern int ext4_ext_migrate(struct inode *);
2161 : : extern int ext4_ind_migrate(struct inode *inode);
2162 : :
2163 : : /* namei.c */
2164 : : extern int ext4_dirent_csum_verify(struct inode *inode,
2165 : : struct ext4_dir_entry *dirent);
2166 : : extern int ext4_orphan_add(handle_t *, struct inode *);
2167 : : extern int ext4_orphan_del(handle_t *, struct inode *);
2168 : : extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
2169 : : __u32 start_minor_hash, __u32 *next_hash);
2170 : : extern int search_dir(struct buffer_head *bh,
2171 : : char *search_buf,
2172 : : int buf_size,
2173 : : struct inode *dir,
2174 : : const struct qstr *d_name,
2175 : : unsigned int offset,
2176 : : struct ext4_dir_entry_2 **res_dir);
2177 : : extern int ext4_generic_delete_entry(handle_t *handle,
2178 : : struct inode *dir,
2179 : : struct ext4_dir_entry_2 *de_del,
2180 : : struct buffer_head *bh,
2181 : : void *entry_buf,
2182 : : int buf_size,
2183 : : int csum_size);
2184 : :
2185 : : /* resize.c */
2186 : : extern int ext4_group_add(struct super_block *sb,
2187 : : struct ext4_new_group_data *input);
2188 : : extern int ext4_group_extend(struct super_block *sb,
2189 : : struct ext4_super_block *es,
2190 : : ext4_fsblk_t n_blocks_count);
2191 : : extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count);
2192 : :
2193 : : /* super.c */
2194 : : extern int ext4_calculate_overhead(struct super_block *sb);
2195 : : extern int ext4_superblock_csum_verify(struct super_block *sb,
2196 : : struct ext4_super_block *es);
2197 : : extern void ext4_superblock_csum_set(struct super_block *sb);
2198 : : extern void *ext4_kvmalloc(size_t size, gfp_t flags);
2199 : : extern void *ext4_kvzalloc(size_t size, gfp_t flags);
2200 : : extern void ext4_kvfree(void *ptr);
2201 : : extern int ext4_alloc_flex_bg_array(struct super_block *sb,
2202 : : ext4_group_t ngroup);
2203 : : extern const char *ext4_decode_error(struct super_block *sb, int errno,
2204 : : char nbuf[16]);
2205 : :
2206 : : extern __printf(4, 5)
2207 : : void __ext4_error(struct super_block *, const char *, unsigned int,
2208 : : const char *, ...);
2209 : : extern __printf(5, 6)
2210 : : void __ext4_error_inode(struct inode *, const char *, unsigned int, ext4_fsblk_t,
2211 : : const char *, ...);
2212 : : extern __printf(5, 6)
2213 : : void __ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t,
2214 : : const char *, ...);
2215 : : extern void __ext4_std_error(struct super_block *, const char *,
2216 : : unsigned int, int);
2217 : : extern __printf(4, 5)
2218 : : void __ext4_abort(struct super_block *, const char *, unsigned int,
2219 : : const char *, ...);
2220 : : extern __printf(4, 5)
2221 : : void __ext4_warning(struct super_block *, const char *, unsigned int,
2222 : : const char *, ...);
2223 : : extern __printf(3, 4)
2224 : : void __ext4_msg(struct super_block *, const char *, const char *, ...);
2225 : : extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp,
2226 : : const char *, unsigned int, const char *);
2227 : : extern __printf(7, 8)
2228 : : void __ext4_grp_locked_error(const char *, unsigned int,
2229 : : struct super_block *, ext4_group_t,
2230 : : unsigned long, ext4_fsblk_t,
2231 : : const char *, ...);
2232 : :
2233 : : #ifdef CONFIG_PRINTK
2234 : :
2235 : : #define ext4_error_inode(inode, func, line, block, fmt, ...) \
2236 : : __ext4_error_inode(inode, func, line, block, fmt, ##__VA_ARGS__)
2237 : : #define ext4_error_file(file, func, line, block, fmt, ...) \
2238 : : __ext4_error_file(file, func, line, block, fmt, ##__VA_ARGS__)
2239 : : #define ext4_error(sb, fmt, ...) \
2240 : : __ext4_error(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
2241 : : #define ext4_abort(sb, fmt, ...) \
2242 : : __ext4_abort(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
2243 : : #define ext4_warning(sb, fmt, ...) \
2244 : : __ext4_warning(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
2245 : : #define ext4_msg(sb, level, fmt, ...) \
2246 : : __ext4_msg(sb, level, fmt, ##__VA_ARGS__)
2247 : : #define dump_mmp_msg(sb, mmp, msg) \
2248 : : __dump_mmp_msg(sb, mmp, __func__, __LINE__, msg)
2249 : : #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \
2250 : : __ext4_grp_locked_error(__func__, __LINE__, sb, grp, ino, block, \
2251 : : fmt, ##__VA_ARGS__)
2252 : :
2253 : : #else
2254 : :
2255 : : #define ext4_error_inode(inode, func, line, block, fmt, ...) \
2256 : : do { \
2257 : : no_printk(fmt, ##__VA_ARGS__); \
2258 : : __ext4_error_inode(inode, "", 0, block, " "); \
2259 : : } while (0)
2260 : : #define ext4_error_file(file, func, line, block, fmt, ...) \
2261 : : do { \
2262 : : no_printk(fmt, ##__VA_ARGS__); \
2263 : : __ext4_error_file(file, "", 0, block, " "); \
2264 : : } while (0)
2265 : : #define ext4_error(sb, fmt, ...) \
2266 : : do { \
2267 : : no_printk(fmt, ##__VA_ARGS__); \
2268 : : __ext4_error(sb, "", 0, " "); \
2269 : : } while (0)
2270 : : #define ext4_abort(sb, fmt, ...) \
2271 : : do { \
2272 : : no_printk(fmt, ##__VA_ARGS__); \
2273 : : __ext4_abort(sb, "", 0, " "); \
2274 : : } while (0)
2275 : : #define ext4_warning(sb, fmt, ...) \
2276 : : do { \
2277 : : no_printk(fmt, ##__VA_ARGS__); \
2278 : : __ext4_warning(sb, "", 0, " "); \
2279 : : } while (0)
2280 : : #define ext4_msg(sb, level, fmt, ...) \
2281 : : do { \
2282 : : no_printk(fmt, ##__VA_ARGS__); \
2283 : : __ext4_msg(sb, "", " "); \
2284 : : } while (0)
2285 : : #define dump_mmp_msg(sb, mmp, msg) \
2286 : : __dump_mmp_msg(sb, mmp, "", 0, "")
2287 : : #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \
2288 : : do { \
2289 : : no_printk(fmt, ##__VA_ARGS__); \
2290 : : __ext4_grp_locked_error("", 0, sb, grp, ino, block, " "); \
2291 : : } while (0)
2292 : :
2293 : : #endif
2294 : :
2295 : : extern void ext4_update_dynamic_rev(struct super_block *sb);
2296 : : extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb,
2297 : : __u32 compat);
2298 : : extern int ext4_update_rocompat_feature(handle_t *handle,
2299 : : struct super_block *sb, __u32 rocompat);
2300 : : extern int ext4_update_incompat_feature(handle_t *handle,
2301 : : struct super_block *sb, __u32 incompat);
2302 : : extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
2303 : : struct ext4_group_desc *bg);
2304 : : extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
2305 : : struct ext4_group_desc *bg);
2306 : : extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
2307 : : struct ext4_group_desc *bg);
2308 : : extern __u32 ext4_free_group_clusters(struct super_block *sb,
2309 : : struct ext4_group_desc *bg);
2310 : : extern __u32 ext4_free_inodes_count(struct super_block *sb,
2311 : : struct ext4_group_desc *bg);
2312 : : extern __u32 ext4_used_dirs_count(struct super_block *sb,
2313 : : struct ext4_group_desc *bg);
2314 : : extern __u32 ext4_itable_unused_count(struct super_block *sb,
2315 : : struct ext4_group_desc *bg);
2316 : : extern void ext4_block_bitmap_set(struct super_block *sb,
2317 : : struct ext4_group_desc *bg, ext4_fsblk_t blk);
2318 : : extern void ext4_inode_bitmap_set(struct super_block *sb,
2319 : : struct ext4_group_desc *bg, ext4_fsblk_t blk);
2320 : : extern void ext4_inode_table_set(struct super_block *sb,
2321 : : struct ext4_group_desc *bg, ext4_fsblk_t blk);
2322 : : extern void ext4_free_group_clusters_set(struct super_block *sb,
2323 : : struct ext4_group_desc *bg,
2324 : : __u32 count);
2325 : : extern void ext4_free_inodes_set(struct super_block *sb,
2326 : : struct ext4_group_desc *bg, __u32 count);
2327 : : extern void ext4_used_dirs_set(struct super_block *sb,
2328 : : struct ext4_group_desc *bg, __u32 count);
2329 : : extern void ext4_itable_unused_set(struct super_block *sb,
2330 : : struct ext4_group_desc *bg, __u32 count);
2331 : : extern int ext4_group_desc_csum_verify(struct super_block *sb, __u32 group,
2332 : : struct ext4_group_desc *gdp);
2333 : : extern void ext4_group_desc_csum_set(struct super_block *sb, __u32 group,
2334 : : struct ext4_group_desc *gdp);
2335 : : extern int ext4_register_li_request(struct super_block *sb,
2336 : : ext4_group_t first_not_zeroed);
2337 : :
2338 : 2665017 : static inline int ext4_has_group_desc_csum(struct super_block *sb)
2339 : : {
2340 : 2665188 : return EXT4_HAS_RO_COMPAT_FEATURE(sb,
2341 : : EXT4_FEATURE_RO_COMPAT_GDT_CSUM |
2342 : : EXT4_FEATURE_RO_COMPAT_METADATA_CSUM);
2343 : : }
2344 : :
2345 : : static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
2346 : : {
2347 : 4924673 : return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) |
2348 : : le32_to_cpu(es->s_blocks_count_lo);
2349 : : }
2350 : :
2351 : : static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
2352 : : {
2353 : 1987477 : return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) |
2354 : : le32_to_cpu(es->s_r_blocks_count_lo);
2355 : : }
2356 : :
2357 : : static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
2358 : : {
2359 : 0 : return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) |
2360 : : le32_to_cpu(es->s_free_blocks_count_lo);
2361 : : }
2362 : :
2363 : : static inline void ext4_blocks_count_set(struct ext4_super_block *es,
2364 : : ext4_fsblk_t blk)
2365 : : {
2366 : 0 : es->s_blocks_count_lo = cpu_to_le32((u32)blk);
2367 : 0 : es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
2368 : : }
2369 : :
2370 : : static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
2371 : : ext4_fsblk_t blk)
2372 : : {
2373 : 0 : es->s_free_blocks_count_lo = cpu_to_le32((u32)blk);
2374 : 0 : es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
2375 : : }
2376 : :
2377 : : static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
2378 : : ext4_fsblk_t blk)
2379 : : {
2380 : 0 : es->s_r_blocks_count_lo = cpu_to_le32((u32)blk);
2381 : 0 : es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
2382 : : }
2383 : :
2384 : : static inline loff_t ext4_isize(struct ext4_inode *raw_inode)
2385 : : {
2386 [ + + ][ + + ]: 10855776 : if (S_ISREG(le16_to_cpu(raw_inode->i_mode)))
2387 : 8203426 : return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) |
2388 : 8203426 : le32_to_cpu(raw_inode->i_size_lo);
2389 : : else
2390 : 2652350 : return (loff_t) le32_to_cpu(raw_inode->i_size_lo);
2391 : : }
2392 : :
2393 : : static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size)
2394 : : {
2395 : 260100 : raw_inode->i_size_lo = cpu_to_le32(i_size);
2396 : 260100 : raw_inode->i_size_high = cpu_to_le32(i_size >> 32);
2397 : : }
2398 : :
2399 : : static inline
2400 : 1441626 : struct ext4_group_info *ext4_get_group_info(struct super_block *sb,
2401 : : ext4_group_t group)
2402 : : {
2403 : : struct ext4_group_info ***grp_info;
2404 : : long indexv, indexh;
2405 [ # # ][ - + ]: 2499878 : BUG_ON(group >= EXT4_SB(sb)->s_groups_count);
[ - + ][ - + ]
[ # # ][ - + ]
[ # # ][ - + ]
[ - + ][ - + ]
[ - + ][ # # ]
[ # # ][ - + ]
[ - + ][ - + ]
[ - + ][ - + ]
[ - + ][ - + ]
[ - + ][ - + ]
2406 : 2499762 : grp_info = EXT4_SB(sb)->s_group_info;
2407 : 2499762 : indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb));
2408 : 2499762 : indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1);
2409 : 2132564 : return grp_info[indexv][indexh];
2410 : : }
2411 : :
2412 : : /*
2413 : : * Reading s_groups_count requires using smp_rmb() afterwards. See
2414 : : * the locking protocol documented in the comments of ext4_group_add()
2415 : : * in resize.c
2416 : : */
2417 : 15332267 : static inline ext4_group_t ext4_get_groups_count(struct super_block *sb)
2418 : : {
2419 : 15462906 : ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
2420 : :
2421 : 15462906 : smp_rmb();
2422 : : return ngroups;
2423 : : }
2424 : :
2425 : : static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi,
2426 : : ext4_group_t block_group)
2427 : : {
2428 : 1310472 : return block_group >> sbi->s_log_groups_per_flex;
2429 : : }
2430 : :
2431 : : static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi)
2432 : : {
2433 : 714474 : return 1 << sbi->s_log_groups_per_flex;
2434 : : }
2435 : :
2436 : : #define ext4_std_error(sb, errno) \
2437 : : do { \
2438 : : if ((errno)) \
2439 : : __ext4_std_error((sb), __func__, __LINE__, (errno)); \
2440 : : } while (0)
2441 : :
2442 : : #ifdef CONFIG_SMP
2443 : : /* Each CPU can accumulate percpu_counter_batch clusters in their local
2444 : : * counters. So we need to make sure we have free clusters more
2445 : : * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times.
2446 : : */
2447 : : #define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids))
2448 : : #else
2449 : : #define EXT4_FREECLUSTERS_WATERMARK 0
2450 : : #endif
2451 : :
2452 : : /* Update i_disksize. Requires i_mutex to avoid races with truncate */
2453 : : static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize)
2454 : : {
2455 [ + + ][ + - ]: 7560 : WARN_ON_ONCE(S_ISREG(inode->i_mode) &&
[ - + ][ # # ]
[ # # ][ # # ]
[ # # ][ # # ]
[ # # ][ # # ]
2456 : : !mutex_is_locked(&inode->i_mutex));
2457 : 7560 : down_write(&EXT4_I(inode)->i_data_sem);
2458 [ + - # # ]: 7560 : if (newsize > EXT4_I(inode)->i_disksize)
2459 : 7560 : EXT4_I(inode)->i_disksize = newsize;
2460 : 7560 : up_write(&EXT4_I(inode)->i_data_sem);
2461 : : }
2462 : :
2463 : : /*
2464 : : * Update i_disksize after writeback has been started. Races with truncate
2465 : : * are avoided by checking i_size under i_data_sem.
2466 : : */
2467 : : static inline void ext4_wb_update_i_disksize(struct inode *inode, loff_t newsize)
2468 : : {
2469 : : loff_t i_size;
2470 : :
2471 : 45133 : down_write(&EXT4_I(inode)->i_data_sem);
2472 : : i_size = i_size_read(inode);
2473 [ + + ]: 45127 : if (newsize > i_size)
2474 : : newsize = i_size;
2475 [ + + ]: 45127 : if (newsize > EXT4_I(inode)->i_disksize)
2476 : 45035 : EXT4_I(inode)->i_disksize = newsize;
2477 : 45127 : up_write(&EXT4_I(inode)->i_data_sem);
2478 : : }
2479 : :
2480 : : struct ext4_group_info {
2481 : : unsigned long bb_state;
2482 : : struct rb_root bb_free_root;
2483 : : ext4_grpblk_t bb_first_free; /* first free block */
2484 : : ext4_grpblk_t bb_free; /* total free blocks */
2485 : : ext4_grpblk_t bb_fragments; /* nr of freespace fragments */
2486 : : ext4_grpblk_t bb_largest_free_order;/* order of largest frag in BG */
2487 : : struct list_head bb_prealloc_list;
2488 : : #ifdef DOUBLE_CHECK
2489 : : void *bb_bitmap;
2490 : : #endif
2491 : : struct rw_semaphore alloc_sem;
2492 : : ext4_grpblk_t bb_counters[]; /* Nr of free power-of-two-block
2493 : : * regions, index is order.
2494 : : * bb_counters[3] = 5 means
2495 : : * 5 free 8-block regions. */
2496 : : };
2497 : :
2498 : : #define EXT4_GROUP_INFO_NEED_INIT_BIT 0
2499 : : #define EXT4_GROUP_INFO_WAS_TRIMMED_BIT 1
2500 : : #define EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT 2
2501 : : #define EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT 3
2502 : :
2503 : : #define EXT4_MB_GRP_NEED_INIT(grp) \
2504 : : (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state)))
2505 : : #define EXT4_MB_GRP_BBITMAP_CORRUPT(grp) \
2506 : : (test_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &((grp)->bb_state)))
2507 : : #define EXT4_MB_GRP_IBITMAP_CORRUPT(grp) \
2508 : : (test_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &((grp)->bb_state)))
2509 : :
2510 : : #define EXT4_MB_GRP_WAS_TRIMMED(grp) \
2511 : : (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2512 : : #define EXT4_MB_GRP_SET_TRIMMED(grp) \
2513 : : (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2514 : : #define EXT4_MB_GRP_CLEAR_TRIMMED(grp) \
2515 : : (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2516 : :
2517 : : #define EXT4_MAX_CONTENTION 8
2518 : : #define EXT4_CONTENTION_THRESHOLD 2
2519 : :
2520 : 6761333 : static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb,
2521 : : ext4_group_t group)
2522 : : {
2523 : 6761463 : return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group);
2524 : : }
2525 : :
2526 : : /*
2527 : : * Returns true if the filesystem is busy enough that attempts to
2528 : : * access the block group locks has run into contention.
2529 : : */
2530 : : static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi)
2531 : : {
2532 : 23247 : return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD);
2533 : : }
2534 : :
2535 : 2875833 : static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group)
2536 : : {
2537 : 2875827 : spinlock_t *lock = ext4_group_lock_ptr(sb, group);
2538 [ + + + + : 2875833 : if (spin_trylock(lock))
# # + + #
# + + + -
+ + + + #
# + - + +
# # + + +
+ # # + +
+ + + - +
- + - ]
2539 : : /*
2540 : : * We're able to grab the lock right away, so drop the
2541 : : * lock contention counter.
2542 : : */
2543 : 2870273 : atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0);
2544 : : else {
2545 : : /*
2546 : : * The lock is busy, so bump the contention counter,
2547 : : * and then wait on the spin lock.
2548 : : */
2549 : 5560 : atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1,
2550 : : EXT4_MAX_CONTENTION);
2551 : : spin_lock(lock);
2552 : : }
2553 : : }
2554 : :
2555 : : static inline void ext4_unlock_group(struct super_block *sb,
2556 : : ext4_group_t group)
2557 : : {
2558 : 2875832 : spin_unlock(ext4_group_lock_ptr(sb, group));
2559 : : }
2560 : :
2561 : : /*
2562 : : * Block validity checking
2563 : : */
2564 : : #define ext4_check_indirect_blockref(inode, bh) \
2565 : : ext4_check_blockref(__func__, __LINE__, inode, \
2566 : : (__le32 *)(bh)->b_data, \
2567 : : EXT4_ADDR_PER_BLOCK((inode)->i_sb))
2568 : :
2569 : : #define ext4_ind_check_inode(inode) \
2570 : : ext4_check_blockref(__func__, __LINE__, inode, \
2571 : : EXT4_I(inode)->i_data, \
2572 : : EXT4_NDIR_BLOCKS)
2573 : :
2574 : : /*
2575 : : * Inodes and files operations
2576 : : */
2577 : :
2578 : : /* dir.c */
2579 : : extern const struct file_operations ext4_dir_operations;
2580 : :
2581 : : /* file.c */
2582 : : extern const struct inode_operations ext4_file_inode_operations;
2583 : : extern const struct file_operations ext4_file_operations;
2584 : : extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin);
2585 : : extern void ext4_unwritten_wait(struct inode *inode);
2586 : :
2587 : : /* inline.c */
2588 : : extern int ext4_has_inline_data(struct inode *inode);
2589 : : extern int ext4_get_inline_size(struct inode *inode);
2590 : : extern int ext4_get_max_inline_size(struct inode *inode);
2591 : : extern int ext4_find_inline_data_nolock(struct inode *inode);
2592 : : extern void ext4_write_inline_data(struct inode *inode,
2593 : : struct ext4_iloc *iloc,
2594 : : void *buffer, loff_t pos,
2595 : : unsigned int len);
2596 : : extern int ext4_prepare_inline_data(handle_t *handle, struct inode *inode,
2597 : : unsigned int len);
2598 : : extern int ext4_init_inline_data(handle_t *handle, struct inode *inode,
2599 : : unsigned int len);
2600 : : extern int ext4_destroy_inline_data(handle_t *handle, struct inode *inode);
2601 : :
2602 : : extern int ext4_readpage_inline(struct inode *inode, struct page *page);
2603 : : extern int ext4_try_to_write_inline_data(struct address_space *mapping,
2604 : : struct inode *inode,
2605 : : loff_t pos, unsigned len,
2606 : : unsigned flags,
2607 : : struct page **pagep);
2608 : : extern int ext4_write_inline_data_end(struct inode *inode,
2609 : : loff_t pos, unsigned len,
2610 : : unsigned copied,
2611 : : struct page *page);
2612 : : extern struct buffer_head *
2613 : : ext4_journalled_write_inline_data(struct inode *inode,
2614 : : unsigned len,
2615 : : struct page *page);
2616 : : extern int ext4_da_write_inline_data_begin(struct address_space *mapping,
2617 : : struct inode *inode,
2618 : : loff_t pos, unsigned len,
2619 : : unsigned flags,
2620 : : struct page **pagep,
2621 : : void **fsdata);
2622 : : extern int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos,
2623 : : unsigned len, unsigned copied,
2624 : : struct page *page);
2625 : : extern int ext4_try_add_inline_entry(handle_t *handle, struct dentry *dentry,
2626 : : struct inode *inode);
2627 : : extern int ext4_try_create_inline_dir(handle_t *handle,
2628 : : struct inode *parent,
2629 : : struct inode *inode);
2630 : : extern int ext4_read_inline_dir(struct file *filp,
2631 : : struct dir_context *ctx,
2632 : : int *has_inline_data);
2633 : : extern int htree_inlinedir_to_tree(struct file *dir_file,
2634 : : struct inode *dir, ext4_lblk_t block,
2635 : : struct dx_hash_info *hinfo,
2636 : : __u32 start_hash, __u32 start_minor_hash,
2637 : : int *has_inline_data);
2638 : : extern struct buffer_head *ext4_find_inline_entry(struct inode *dir,
2639 : : const struct qstr *d_name,
2640 : : struct ext4_dir_entry_2 **res_dir,
2641 : : int *has_inline_data);
2642 : : extern int ext4_delete_inline_entry(handle_t *handle,
2643 : : struct inode *dir,
2644 : : struct ext4_dir_entry_2 *de_del,
2645 : : struct buffer_head *bh,
2646 : : int *has_inline_data);
2647 : : extern int empty_inline_dir(struct inode *dir, int *has_inline_data);
2648 : : extern struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
2649 : : struct ext4_dir_entry_2 **parent_de,
2650 : : int *retval);
2651 : : extern int ext4_inline_data_fiemap(struct inode *inode,
2652 : : struct fiemap_extent_info *fieinfo,
2653 : : int *has_inline);
2654 : : extern int ext4_try_to_evict_inline_data(handle_t *handle,
2655 : : struct inode *inode,
2656 : : int needed);
2657 : : extern void ext4_inline_data_truncate(struct inode *inode, int *has_inline);
2658 : :
2659 : : extern int ext4_convert_inline_data(struct inode *inode);
2660 : :
2661 : : /* namei.c */
2662 : : extern const struct inode_operations ext4_dir_inode_operations;
2663 : : extern const struct inode_operations ext4_special_inode_operations;
2664 : : extern struct dentry *ext4_get_parent(struct dentry *child);
2665 : : extern struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode,
2666 : : struct ext4_dir_entry_2 *de,
2667 : : int blocksize, int csum_size,
2668 : : unsigned int parent_ino, int dotdot_real_len);
2669 : : extern void initialize_dirent_tail(struct ext4_dir_entry_tail *t,
2670 : : unsigned int blocksize);
2671 : : extern int ext4_handle_dirty_dirent_node(handle_t *handle,
2672 : : struct inode *inode,
2673 : : struct buffer_head *bh);
2674 : : #define S_SHIFT 12
2675 : : static unsigned char ext4_type_by_mode[S_IFMT >> S_SHIFT] = {
2676 : : [S_IFREG >> S_SHIFT] = EXT4_FT_REG_FILE,
2677 : : [S_IFDIR >> S_SHIFT] = EXT4_FT_DIR,
2678 : : [S_IFCHR >> S_SHIFT] = EXT4_FT_CHRDEV,
2679 : : [S_IFBLK >> S_SHIFT] = EXT4_FT_BLKDEV,
2680 : : [S_IFIFO >> S_SHIFT] = EXT4_FT_FIFO,
2681 : : [S_IFSOCK >> S_SHIFT] = EXT4_FT_SOCK,
2682 : : [S_IFLNK >> S_SHIFT] = EXT4_FT_SYMLINK,
2683 : : };
2684 : :
2685 : 558803 : static inline void ext4_set_de_type(struct super_block *sb,
2686 : : struct ext4_dir_entry_2 *de,
2687 : : umode_t mode) {
2688 [ + - ][ + - ]: 558803 : if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FILETYPE))
[ + - ]
2689 : 558803 : de->file_type = ext4_type_by_mode[(mode & S_IFMT)>>S_SHIFT];
2690 : : }
2691 : :
2692 : :
2693 : : /* symlink.c */
2694 : : extern const struct inode_operations ext4_symlink_inode_operations;
2695 : : extern const struct inode_operations ext4_fast_symlink_inode_operations;
2696 : :
2697 : : /* block_validity */
2698 : : extern void ext4_release_system_zone(struct super_block *sb);
2699 : : extern int ext4_setup_system_zone(struct super_block *sb);
2700 : : extern int __init ext4_init_system_zone(void);
2701 : : extern void ext4_exit_system_zone(void);
2702 : : extern int ext4_data_block_valid(struct ext4_sb_info *sbi,
2703 : : ext4_fsblk_t start_blk,
2704 : : unsigned int count);
2705 : : extern int ext4_check_blockref(const char *, unsigned int,
2706 : : struct inode *, __le32 *, unsigned int);
2707 : :
2708 : : /* extents.c */
2709 : : struct ext4_ext_path;
2710 : : struct ext4_extent;
2711 : :
2712 : : /*
2713 : : * Maximum number of logical blocks in a file; ext4_extent's ee_block is
2714 : : * __le32.
2715 : : */
2716 : : #define EXT_MAX_BLOCKS 0xffffffff
2717 : :
2718 : : extern int ext4_ext_tree_init(handle_t *handle, struct inode *);
2719 : : extern int ext4_ext_writepage_trans_blocks(struct inode *, int);
2720 : : extern int ext4_ext_index_trans_blocks(struct inode *inode, int extents);
2721 : : extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
2722 : : struct ext4_map_blocks *map, int flags);
2723 : : extern void ext4_ext_truncate(handle_t *, struct inode *);
2724 : : extern int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start,
2725 : : ext4_lblk_t end);
2726 : : extern void ext4_ext_init(struct super_block *);
2727 : : extern void ext4_ext_release(struct super_block *);
2728 : : extern long ext4_fallocate(struct file *file, int mode, loff_t offset,
2729 : : loff_t len);
2730 : : extern int ext4_convert_unwritten_extents(handle_t *handle, struct inode *inode,
2731 : : loff_t offset, ssize_t len);
2732 : : extern int ext4_map_blocks(handle_t *handle, struct inode *inode,
2733 : : struct ext4_map_blocks *map, int flags);
2734 : : extern int ext4_ext_calc_metadata_amount(struct inode *inode,
2735 : : ext4_lblk_t lblocks);
2736 : : extern int ext4_extent_tree_init(handle_t *, struct inode *);
2737 : : extern int ext4_ext_calc_credits_for_single_extent(struct inode *inode,
2738 : : int num,
2739 : : struct ext4_ext_path *path);
2740 : : extern int ext4_can_extents_be_merged(struct inode *inode,
2741 : : struct ext4_extent *ex1,
2742 : : struct ext4_extent *ex2);
2743 : : extern int ext4_ext_insert_extent(handle_t *, struct inode *,
2744 : : struct ext4_ext_path *,
2745 : : struct ext4_extent *, int);
2746 : : extern struct ext4_ext_path *ext4_ext_find_extent(struct inode *, ext4_lblk_t,
2747 : : struct ext4_ext_path *,
2748 : : int flags);
2749 : : extern void ext4_ext_drop_refs(struct ext4_ext_path *);
2750 : : extern int ext4_ext_check_inode(struct inode *inode);
2751 : : extern int ext4_find_delalloc_range(struct inode *inode,
2752 : : ext4_lblk_t lblk_start,
2753 : : ext4_lblk_t lblk_end);
2754 : : extern int ext4_find_delalloc_cluster(struct inode *inode, ext4_lblk_t lblk);
2755 : : extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
2756 : : __u64 start, __u64 len);
2757 : : extern int ext4_ext_precache(struct inode *inode);
2758 : :
2759 : : /* move_extent.c */
2760 : : extern void ext4_double_down_write_data_sem(struct inode *first,
2761 : : struct inode *second);
2762 : : extern void ext4_double_up_write_data_sem(struct inode *orig_inode,
2763 : : struct inode *donor_inode);
2764 : : extern int ext4_move_extents(struct file *o_filp, struct file *d_filp,
2765 : : __u64 start_orig, __u64 start_donor,
2766 : : __u64 len, __u64 *moved_len);
2767 : :
2768 : : /* page-io.c */
2769 : : extern int __init ext4_init_pageio(void);
2770 : : extern void ext4_exit_pageio(void);
2771 : : extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags);
2772 : : extern ext4_io_end_t *ext4_get_io_end(ext4_io_end_t *io_end);
2773 : : extern int ext4_put_io_end(ext4_io_end_t *io_end);
2774 : : extern void ext4_put_io_end_defer(ext4_io_end_t *io_end);
2775 : : extern void ext4_io_submit_init(struct ext4_io_submit *io,
2776 : : struct writeback_control *wbc);
2777 : : extern void ext4_end_io_rsv_work(struct work_struct *work);
2778 : : extern void ext4_io_submit(struct ext4_io_submit *io);
2779 : : extern int ext4_bio_write_page(struct ext4_io_submit *io,
2780 : : struct page *page,
2781 : : int len,
2782 : : struct writeback_control *wbc);
2783 : :
2784 : : /* mmp.c */
2785 : : extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t);
2786 : : extern void ext4_mmp_csum_set(struct super_block *sb, struct mmp_struct *mmp);
2787 : : extern int ext4_mmp_csum_verify(struct super_block *sb,
2788 : : struct mmp_struct *mmp);
2789 : :
2790 : : /*
2791 : : * Note that these flags will never ever appear in a buffer_head's state flag.
2792 : : * See EXT4_MAP_... to see where this is used.
2793 : : */
2794 : : enum ext4_state_bits {
2795 : : BH_Uninit /* blocks are allocated but uninitialized on disk */
2796 : : = BH_JBDPrivateStart,
2797 : : BH_AllocFromCluster, /* allocated blocks were part of already
2798 : : * allocated cluster. */
2799 : : };
2800 : :
2801 : : /*
2802 : : * Add new method to test whether block and inode bitmaps are properly
2803 : : * initialized. With uninit_bg reading the block from disk is not enough
2804 : : * to mark the bitmap uptodate. We need to also zero-out the bitmap
2805 : : */
2806 : : #define BH_BITMAP_UPTODATE BH_JBDPrivateStart
2807 : :
2808 : : static inline int bitmap_uptodate(struct buffer_head *bh)
2809 : : {
2810 [ + + ][ - + ]: 1290899 : return (buffer_uptodate(bh) &&
[ + + ][ - + ]
2811 : : test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state));
2812 : : }
2813 : : static inline void set_bitmap_uptodate(struct buffer_head *bh)
2814 : : {
2815 : 152 : set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state);
2816 : : }
2817 : :
2818 : : /*
2819 : : * Disable DIO read nolock optimization, so new dioreaders will be forced
2820 : : * to grab i_mutex
2821 : : */
2822 : : static inline void ext4_inode_block_unlocked_dio(struct inode *inode)
2823 : : {
2824 : : ext4_set_inode_state(inode, EXT4_STATE_DIOREAD_LOCK);
2825 : 32365 : smp_mb();
2826 : : }
2827 : : static inline void ext4_inode_resume_unlocked_dio(struct inode *inode)
2828 : : {
2829 : 32365 : smp_mb();
2830 : : ext4_clear_inode_state(inode, EXT4_STATE_DIOREAD_LOCK);
2831 : : }
2832 : :
2833 : : #define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1)
2834 : :
2835 : : /* For ioend & aio unwritten conversion wait queues */
2836 : : #define EXT4_WQ_HASH_SZ 37
2837 : : #define ext4_ioend_wq(v) (&ext4__ioend_wq[((unsigned long)(v)) %\
2838 : : EXT4_WQ_HASH_SZ])
2839 : : #define ext4_aio_mutex(v) (&ext4__aio_mutex[((unsigned long)(v)) %\
2840 : : EXT4_WQ_HASH_SZ])
2841 : : extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
2842 : : extern struct mutex ext4__aio_mutex[EXT4_WQ_HASH_SZ];
2843 : :
2844 : : #define EXT4_RESIZING 0
2845 : : extern int ext4_resize_begin(struct super_block *sb);
2846 : : extern void ext4_resize_end(struct super_block *sb);
2847 : :
2848 : : #endif /* __KERNEL__ */
2849 : :
2850 : : #endif /* _EXT4_H */
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