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Linux/fs/ext4/ext4.h

  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/version.h>
 30 #include <linux/wait.h>
 31 #include <linux/blockgroup_lock.h>
 32 #include <linux/percpu_counter.h>
 33 #include <linux/ratelimit.h>
 34 #include <crypto/hash.h>
 35 #include <linux/falloc.h>
 36 #ifdef __KERNEL__
 37 #include <linux/compat.h>
 38 #endif
 39 
 40 /*
 41  * The fourth extended filesystem constants/structures
 42  */
 43 
 44 /*
 45  * Define EXT4FS_DEBUG to produce debug messages
 46  */
 47 #undef EXT4FS_DEBUG
 48 
 49 /*
 50  * Debug code
 51  */
 52 #ifdef EXT4FS_DEBUG
 53 #define ext4_debug(f, a...)                                             \
 54         do {                                                            \
 55                 printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:",        \
 56                         __FILE__, __LINE__, __func__);                  \
 57                 printk(KERN_DEBUG f, ## a);                             \
 58         } while (0)
 59 #else
 60 #define ext4_debug(fmt, ...)    no_printk(fmt, ##__VA_ARGS__)
 61 #endif
 62 
 63 /*
 64  * Turn on EXT_DEBUG to get lots of info about extents operations.
 65  */
 66 #define EXT_DEBUG__
 67 #ifdef EXT_DEBUG
 68 #define ext_debug(fmt, ...)     printk(fmt, ##__VA_ARGS__)
 69 #else
 70 #define ext_debug(fmt, ...)     no_printk(fmt, ##__VA_ARGS__)
 71 #endif
 72 
 73 /* data type for block offset of block group */
 74 typedef int ext4_grpblk_t;
 75 
 76 /* data type for filesystem-wide blocks number */
 77 typedef unsigned long long ext4_fsblk_t;
 78 
 79 /* data type for file logical block number */
 80 typedef __u32 ext4_lblk_t;
 81 
 82 /* data type for block group number */
 83 typedef unsigned int ext4_group_t;
 84 
 85 enum SHIFT_DIRECTION {
 86         SHIFT_LEFT = 0,
 87         SHIFT_RIGHT,
 88 };
 89 
 90 /*
 91  * Flags used in mballoc's allocation_context flags field.
 92  *
 93  * Also used to show what's going on for debugging purposes when the
 94  * flag field is exported via the traceport interface
 95  */
 96 
 97 /* prefer goal again. length */
 98 #define EXT4_MB_HINT_MERGE              0x0001
 99 /* blocks already reserved */
100 #define EXT4_MB_HINT_RESERVED           0x0002
101 /* metadata is being allocated */
102 #define EXT4_MB_HINT_METADATA           0x0004
103 /* first blocks in the file */
104 #define EXT4_MB_HINT_FIRST              0x0008
105 /* search for the best chunk */
106 #define EXT4_MB_HINT_BEST               0x0010
107 /* data is being allocated */
108 #define EXT4_MB_HINT_DATA               0x0020
109 /* don't preallocate (for tails) */
110 #define EXT4_MB_HINT_NOPREALLOC         0x0040
111 /* allocate for locality group */
112 #define EXT4_MB_HINT_GROUP_ALLOC        0x0080
113 /* allocate goal blocks or none */
114 #define EXT4_MB_HINT_GOAL_ONLY          0x0100
115 /* goal is meaningful */
116 #define EXT4_MB_HINT_TRY_GOAL           0x0200
117 /* blocks already pre-reserved by delayed allocation */
118 #define EXT4_MB_DELALLOC_RESERVED       0x0400
119 /* We are doing stream allocation */
120 #define EXT4_MB_STREAM_ALLOC            0x0800
121 /* Use reserved root blocks if needed */
122 #define EXT4_MB_USE_ROOT_BLOCKS         0x1000
123 /* Use blocks from reserved pool */
124 #define EXT4_MB_USE_RESERVED            0x2000
125 
126 struct ext4_allocation_request {
127         /* target inode for block we're allocating */
128         struct inode *inode;
129         /* how many blocks we want to allocate */
130         unsigned int len;
131         /* logical block in target inode */
132         ext4_lblk_t logical;
133         /* the closest logical allocated block to the left */
134         ext4_lblk_t lleft;
135         /* the closest logical allocated block to the right */
136         ext4_lblk_t lright;
137         /* phys. target (a hint) */
138         ext4_fsblk_t goal;
139         /* phys. block for the closest logical allocated block to the left */
140         ext4_fsblk_t pleft;
141         /* phys. block for the closest logical allocated block to the right */
142         ext4_fsblk_t pright;
143         /* flags. see above EXT4_MB_HINT_* */
144         unsigned int flags;
145 };
146 
147 /*
148  * Logical to physical block mapping, used by ext4_map_blocks()
149  *
150  * This structure is used to pass requests into ext4_map_blocks() as
151  * well as to store the information returned by ext4_map_blocks().  It
152  * takes less room on the stack than a struct buffer_head.
153  */
154 #define EXT4_MAP_NEW            (1 << BH_New)
155 #define EXT4_MAP_MAPPED         (1 << BH_Mapped)
156 #define EXT4_MAP_UNWRITTEN      (1 << BH_Unwritten)
157 #define EXT4_MAP_BOUNDARY       (1 << BH_Boundary)
158 #define EXT4_MAP_FLAGS          (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\
159                                  EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY)
160 
161 struct ext4_map_blocks {
162         ext4_fsblk_t m_pblk;
163         ext4_lblk_t m_lblk;
164         unsigned int m_len;
165         unsigned int m_flags;
166 };
167 
168 /*
169  * Flags for ext4_io_end->flags
170  */
171 #define EXT4_IO_END_UNWRITTEN   0x0001
172 
173 /*
174  * For converting unwritten extents on a work queue. 'handle' is used for
175  * buffered writeback.
176  */
177 typedef struct ext4_io_end {
178         struct list_head        list;           /* per-file finished IO list */
179         handle_t                *handle;        /* handle reserved for extent
180                                                  * conversion */
181         struct inode            *inode;         /* file being written to */
182         struct bio              *bio;           /* Linked list of completed
183                                                  * bios covering the extent */
184         unsigned int            flag;           /* unwritten or not */
185         loff_t                  offset;         /* offset in the file */
186         ssize_t                 size;           /* size of the extent */
187         atomic_t                count;          /* reference counter */
188 } ext4_io_end_t;
189 
190 struct ext4_io_submit {
191         struct writeback_control *io_wbc;
192         struct bio              *io_bio;
193         ext4_io_end_t           *io_end;
194         sector_t                io_next_block;
195 };
196 
197 /*
198  * Special inodes numbers
199  */
200 #define EXT4_BAD_INO             1      /* Bad blocks inode */
201 #define EXT4_ROOT_INO            2      /* Root inode */
202 #define EXT4_USR_QUOTA_INO       3      /* User quota inode */
203 #define EXT4_GRP_QUOTA_INO       4      /* Group quota inode */
204 #define EXT4_BOOT_LOADER_INO     5      /* Boot loader inode */
205 #define EXT4_UNDEL_DIR_INO       6      /* Undelete directory inode */
206 #define EXT4_RESIZE_INO          7      /* Reserved group descriptors inode */
207 #define EXT4_JOURNAL_INO         8      /* Journal inode */
208 
209 /* First non-reserved inode for old ext4 filesystems */
210 #define EXT4_GOOD_OLD_FIRST_INO 11
211 
212 /*
213  * Maximal count of links to a file
214  */
215 #define EXT4_LINK_MAX           65000
216 
217 /*
218  * Macro-instructions used to manage several block sizes
219  */
220 #define EXT4_MIN_BLOCK_SIZE             1024
221 #define EXT4_MAX_BLOCK_SIZE             65536
222 #define EXT4_MIN_BLOCK_LOG_SIZE         10
223 #define EXT4_MAX_BLOCK_LOG_SIZE         16
224 #ifdef __KERNEL__
225 # define EXT4_BLOCK_SIZE(s)             ((s)->s_blocksize)
226 #else
227 # define EXT4_BLOCK_SIZE(s)             (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
228 #endif
229 #define EXT4_ADDR_PER_BLOCK(s)          (EXT4_BLOCK_SIZE(s) / sizeof(__u32))
230 #define EXT4_CLUSTER_SIZE(s)            (EXT4_BLOCK_SIZE(s) << \
231                                          EXT4_SB(s)->s_cluster_bits)
232 #ifdef __KERNEL__
233 # define EXT4_BLOCK_SIZE_BITS(s)        ((s)->s_blocksize_bits)
234 # define EXT4_CLUSTER_BITS(s)           (EXT4_SB(s)->s_cluster_bits)
235 #else
236 # define EXT4_BLOCK_SIZE_BITS(s)        ((s)->s_log_block_size + 10)
237 #endif
238 #ifdef __KERNEL__
239 #define EXT4_ADDR_PER_BLOCK_BITS(s)     (EXT4_SB(s)->s_addr_per_block_bits)
240 #define EXT4_INODE_SIZE(s)              (EXT4_SB(s)->s_inode_size)
241 #define EXT4_FIRST_INO(s)               (EXT4_SB(s)->s_first_ino)
242 #else
243 #define EXT4_INODE_SIZE(s)      (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
244                                  EXT4_GOOD_OLD_INODE_SIZE : \
245                                  (s)->s_inode_size)
246 #define EXT4_FIRST_INO(s)       (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
247                                  EXT4_GOOD_OLD_FIRST_INO : \
248                                  (s)->s_first_ino)
249 #endif
250 #define EXT4_BLOCK_ALIGN(size, blkbits)         ALIGN((size), (1 << (blkbits)))
251 
252 /* Translate a block number to a cluster number */
253 #define EXT4_B2C(sbi, blk)      ((blk) >> (sbi)->s_cluster_bits)
254 /* Translate a cluster number to a block number */
255 #define EXT4_C2B(sbi, cluster)  ((cluster) << (sbi)->s_cluster_bits)
256 /* Translate # of blks to # of clusters */
257 #define EXT4_NUM_B2C(sbi, blks) (((blks) + (sbi)->s_cluster_ratio - 1) >> \
258                                  (sbi)->s_cluster_bits)
259 /* Mask out the low bits to get the starting block of the cluster */
260 #define EXT4_PBLK_CMASK(s, pblk) ((pblk) &                              \
261                                   ~((ext4_fsblk_t) (s)->s_cluster_ratio - 1))
262 #define EXT4_LBLK_CMASK(s, lblk) ((lblk) &                              \
263                                   ~((ext4_lblk_t) (s)->s_cluster_ratio - 1))
264 /* Get the cluster offset */
265 #define EXT4_PBLK_COFF(s, pblk) ((pblk) &                               \
266                                  ((ext4_fsblk_t) (s)->s_cluster_ratio - 1))
267 #define EXT4_LBLK_COFF(s, lblk) ((lblk) &                               \
268                                  ((ext4_lblk_t) (s)->s_cluster_ratio - 1))
269 
270 /*
271  * Structure of a blocks group descriptor
272  */
273 struct ext4_group_desc
274 {
275         __le32  bg_block_bitmap_lo;     /* Blocks bitmap block */
276         __le32  bg_inode_bitmap_lo;     /* Inodes bitmap block */
277         __le32  bg_inode_table_lo;      /* Inodes table block */
278         __le16  bg_free_blocks_count_lo;/* Free blocks count */
279         __le16  bg_free_inodes_count_lo;/* Free inodes count */
280         __le16  bg_used_dirs_count_lo;  /* Directories count */
281         __le16  bg_flags;               /* EXT4_BG_flags (INODE_UNINIT, etc) */
282         __le32  bg_exclude_bitmap_lo;   /* Exclude bitmap for snapshots */
283         __le16  bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bbitmap) LE */
284         __le16  bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+ibitmap) LE */
285         __le16  bg_itable_unused_lo;    /* Unused inodes count */
286         __le16  bg_checksum;            /* crc16(sb_uuid+group+desc) */
287         __le32  bg_block_bitmap_hi;     /* Blocks bitmap block MSB */
288         __le32  bg_inode_bitmap_hi;     /* Inodes bitmap block MSB */
289         __le32  bg_inode_table_hi;      /* Inodes table block MSB */
290         __le16  bg_free_blocks_count_hi;/* Free blocks count MSB */
291         __le16  bg_free_inodes_count_hi;/* Free inodes count MSB */
292         __le16  bg_used_dirs_count_hi;  /* Directories count MSB */
293         __le16  bg_itable_unused_hi;    /* Unused inodes count MSB */
294         __le32  bg_exclude_bitmap_hi;   /* Exclude bitmap block MSB */
295         __le16  bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bbitmap) BE */
296         __le16  bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+ibitmap) BE */
297         __u32   bg_reserved;
298 };
299 
300 #define EXT4_BG_INODE_BITMAP_CSUM_HI_END        \
301         (offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \
302          sizeof(__le16))
303 #define EXT4_BG_BLOCK_BITMAP_CSUM_HI_END        \
304         (offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \
305          sizeof(__le16))
306 
307 /*
308  * Structure of a flex block group info
309  */
310 
311 struct flex_groups {
312         atomic64_t      free_clusters;
313         atomic_t        free_inodes;
314         atomic_t        used_dirs;
315 };
316 
317 #define EXT4_BG_INODE_UNINIT    0x0001 /* Inode table/bitmap not in use */
318 #define EXT4_BG_BLOCK_UNINIT    0x0002 /* Block bitmap not in use */
319 #define EXT4_BG_INODE_ZEROED    0x0004 /* On-disk itable initialized to zero */
320 
321 /*
322  * Macro-instructions used to manage group descriptors
323  */
324 #define EXT4_MIN_DESC_SIZE              32
325 #define EXT4_MIN_DESC_SIZE_64BIT        64
326 #define EXT4_MAX_DESC_SIZE              EXT4_MIN_BLOCK_SIZE
327 #define EXT4_DESC_SIZE(s)               (EXT4_SB(s)->s_desc_size)
328 #ifdef __KERNEL__
329 # define EXT4_BLOCKS_PER_GROUP(s)       (EXT4_SB(s)->s_blocks_per_group)
330 # define EXT4_CLUSTERS_PER_GROUP(s)     (EXT4_SB(s)->s_clusters_per_group)
331 # define EXT4_DESC_PER_BLOCK(s)         (EXT4_SB(s)->s_desc_per_block)
332 # define EXT4_INODES_PER_GROUP(s)       (EXT4_SB(s)->s_inodes_per_group)
333 # define EXT4_DESC_PER_BLOCK_BITS(s)    (EXT4_SB(s)->s_desc_per_block_bits)
334 #else
335 # define EXT4_BLOCKS_PER_GROUP(s)       ((s)->s_blocks_per_group)
336 # define EXT4_DESC_PER_BLOCK(s)         (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
337 # define EXT4_INODES_PER_GROUP(s)       ((s)->s_inodes_per_group)
338 #endif
339 
340 /*
341  * Constants relative to the data blocks
342  */
343 #define EXT4_NDIR_BLOCKS                12
344 #define EXT4_IND_BLOCK                  EXT4_NDIR_BLOCKS
345 #define EXT4_DIND_BLOCK                 (EXT4_IND_BLOCK + 1)
346 #define EXT4_TIND_BLOCK                 (EXT4_DIND_BLOCK + 1)
347 #define EXT4_N_BLOCKS                   (EXT4_TIND_BLOCK + 1)
348 
349 /*
350  * Inode flags
351  */
352 #define EXT4_SECRM_FL                   0x00000001 /* Secure deletion */
353 #define EXT4_UNRM_FL                    0x00000002 /* Undelete */
354 #define EXT4_COMPR_FL                   0x00000004 /* Compress file */
355 #define EXT4_SYNC_FL                    0x00000008 /* Synchronous updates */
356 #define EXT4_IMMUTABLE_FL               0x00000010 /* Immutable file */
357 #define EXT4_APPEND_FL                  0x00000020 /* writes to file may only append */
358 #define EXT4_NODUMP_FL                  0x00000040 /* do not dump file */
359 #define EXT4_NOATIME_FL                 0x00000080 /* do not update atime */
360 /* Reserved for compression usage... */
361 #define EXT4_DIRTY_FL                   0x00000100
362 #define EXT4_COMPRBLK_FL                0x00000200 /* One or more compressed clusters */
363 #define EXT4_NOCOMPR_FL                 0x00000400 /* Don't compress */
364         /* nb: was previously EXT2_ECOMPR_FL */
365 #define EXT4_ENCRYPT_FL                 0x00000800 /* encrypted file */
366 /* End compression flags --- maybe not all used */
367 #define EXT4_INDEX_FL                   0x00001000 /* hash-indexed directory */
368 #define EXT4_IMAGIC_FL                  0x00002000 /* AFS directory */
369 #define EXT4_JOURNAL_DATA_FL            0x00004000 /* file data should be journaled */
370 #define EXT4_NOTAIL_FL                  0x00008000 /* file tail should not be merged */
371 #define EXT4_DIRSYNC_FL                 0x00010000 /* dirsync behaviour (directories only) */
372 #define EXT4_TOPDIR_FL                  0x00020000 /* Top of directory hierarchies*/
373 #define EXT4_HUGE_FILE_FL               0x00040000 /* Set to each huge file */
374 #define EXT4_EXTENTS_FL                 0x00080000 /* Inode uses extents */
375 #define EXT4_EA_INODE_FL                0x00200000 /* Inode used for large EA */
376 #define EXT4_EOFBLOCKS_FL               0x00400000 /* Blocks allocated beyond EOF */
377 #define EXT4_INLINE_DATA_FL             0x10000000 /* Inode has inline data. */
378 #define EXT4_PROJINHERIT_FL             0x20000000 /* Create with parents projid */
379 #define EXT4_RESERVED_FL                0x80000000 /* reserved for ext4 lib */
380 
381 #define EXT4_FL_USER_VISIBLE            0x304BDFFF /* User visible flags */
382 #define EXT4_FL_USER_MODIFIABLE         0x204380FF /* User modifiable flags */
383 
384 #define EXT4_FL_XFLAG_VISIBLE           (EXT4_SYNC_FL | \
385                                          EXT4_IMMUTABLE_FL | \
386                                          EXT4_APPEND_FL | \
387                                          EXT4_NODUMP_FL | \
388                                          EXT4_NOATIME_FL | \
389                                          EXT4_PROJINHERIT_FL)
390 
391 /* Flags that should be inherited by new inodes from their parent. */
392 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\
393                            EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\
394                            EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\
395                            EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL |\
396                            EXT4_PROJINHERIT_FL)
397 
398 /* Flags that are appropriate for regular files (all but dir-specific ones). */
399 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL))
400 
401 /* Flags that are appropriate for non-directories/regular files. */
402 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL)
403 
404 /* Mask out flags that are inappropriate for the given type of inode. */
405 static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags)
406 {
407         if (S_ISDIR(mode))
408                 return flags;
409         else if (S_ISREG(mode))
410                 return flags & EXT4_REG_FLMASK;
411         else
412                 return flags & EXT4_OTHER_FLMASK;
413 }
414 
415 /*
416  * Inode flags used for atomic set/get
417  */
418 enum {
419         EXT4_INODE_SECRM        = 0,    /* Secure deletion */
420         EXT4_INODE_UNRM         = 1,    /* Undelete */
421         EXT4_INODE_COMPR        = 2,    /* Compress file */
422         EXT4_INODE_SYNC         = 3,    /* Synchronous updates */
423         EXT4_INODE_IMMUTABLE    = 4,    /* Immutable file */
424         EXT4_INODE_APPEND       = 5,    /* writes to file may only append */
425         EXT4_INODE_NODUMP       = 6,    /* do not dump file */
426         EXT4_INODE_NOATIME      = 7,    /* do not update atime */
427 /* Reserved for compression usage... */
428         EXT4_INODE_DIRTY        = 8,
429         EXT4_INODE_COMPRBLK     = 9,    /* One or more compressed clusters */
430         EXT4_INODE_NOCOMPR      = 10,   /* Don't compress */
431         EXT4_INODE_ENCRYPT      = 11,   /* Encrypted file */
432 /* End compression flags --- maybe not all used */
433         EXT4_INODE_INDEX        = 12,   /* hash-indexed directory */
434         EXT4_INODE_IMAGIC       = 13,   /* AFS directory */
435         EXT4_INODE_JOURNAL_DATA = 14,   /* file data should be journaled */
436         EXT4_INODE_NOTAIL       = 15,   /* file tail should not be merged */
437         EXT4_INODE_DIRSYNC      = 16,   /* dirsync behaviour (directories only) */
438         EXT4_INODE_TOPDIR       = 17,   /* Top of directory hierarchies*/
439         EXT4_INODE_HUGE_FILE    = 18,   /* Set to each huge file */
440         EXT4_INODE_EXTENTS      = 19,   /* Inode uses extents */
441         EXT4_INODE_EA_INODE     = 21,   /* Inode used for large EA */
442         EXT4_INODE_EOFBLOCKS    = 22,   /* Blocks allocated beyond EOF */
443         EXT4_INODE_INLINE_DATA  = 28,   /* Data in inode. */
444         EXT4_INODE_PROJINHERIT  = 29,   /* Create with parents projid */
445         EXT4_INODE_RESERVED     = 31,   /* reserved for ext4 lib */
446 };
447 
448 /*
449  * Since it's pretty easy to mix up bit numbers and hex values, we use a
450  * build-time check to make sure that EXT4_XXX_FL is consistent with respect to
451  * EXT4_INODE_XXX. If all is well, the macros will be dropped, so, it won't cost
452  * any extra space in the compiled kernel image, otherwise, the build will fail.
453  * It's important that these values are the same, since we are using
454  * EXT4_INODE_XXX to test for flag values, but EXT4_XXX_FL must be consistent
455  * with the values of FS_XXX_FL defined in include/linux/fs.h and the on-disk
456  * values found in ext2, ext3 and ext4 filesystems, and of course the values
457  * defined in e2fsprogs.
458  *
459  * It's not paranoia if the Murphy's Law really *is* out to get you.  :-)
460  */
461 #define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG))
462 #define CHECK_FLAG_VALUE(FLAG) BUILD_BUG_ON(!TEST_FLAG_VALUE(FLAG))
463 
464 static inline void ext4_check_flag_values(void)
465 {
466         CHECK_FLAG_VALUE(SECRM);
467         CHECK_FLAG_VALUE(UNRM);
468         CHECK_FLAG_VALUE(COMPR);
469         CHECK_FLAG_VALUE(SYNC);
470         CHECK_FLAG_VALUE(IMMUTABLE);
471         CHECK_FLAG_VALUE(APPEND);
472         CHECK_FLAG_VALUE(NODUMP);
473         CHECK_FLAG_VALUE(NOATIME);
474         CHECK_FLAG_VALUE(DIRTY);
475         CHECK_FLAG_VALUE(COMPRBLK);
476         CHECK_FLAG_VALUE(NOCOMPR);
477         CHECK_FLAG_VALUE(ENCRYPT);
478         CHECK_FLAG_VALUE(INDEX);
479         CHECK_FLAG_VALUE(IMAGIC);
480         CHECK_FLAG_VALUE(JOURNAL_DATA);
481         CHECK_FLAG_VALUE(NOTAIL);
482         CHECK_FLAG_VALUE(DIRSYNC);
483         CHECK_FLAG_VALUE(TOPDIR);
484         CHECK_FLAG_VALUE(HUGE_FILE);
485         CHECK_FLAG_VALUE(EXTENTS);
486         CHECK_FLAG_VALUE(EA_INODE);
487         CHECK_FLAG_VALUE(EOFBLOCKS);
488         CHECK_FLAG_VALUE(INLINE_DATA);
489         CHECK_FLAG_VALUE(PROJINHERIT);
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 unwritten
540            extent to be an initialized ext4 */
541 #define EXT4_GET_BLOCKS_CREATE                  0x0001
542         /* Request the creation of an unwritten extent */
543 #define EXT4_GET_BLOCKS_UNWRIT_EXT              0x0002
544 #define EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT       (EXT4_GET_BLOCKS_UNWRIT_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         unwritten extents if not allocated, split the unwritten
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_UNWRIT_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_UNWRIT_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         /* Convert written extents to unwritten */
567 #define EXT4_GET_BLOCKS_CONVERT_UNWRITTEN       0x0100
568         /* Write zeros to newly created written extents */
569 #define EXT4_GET_BLOCKS_ZERO                    0x0200
570 #define EXT4_GET_BLOCKS_CREATE_ZERO             (EXT4_GET_BLOCKS_CREATE |\
571                                         EXT4_GET_BLOCKS_ZERO)
572 
573 /*
574  * The bit position of these flags must not overlap with any of the
575  * EXT4_GET_BLOCKS_*.  They are used by ext4_find_extent(),
576  * read_extent_tree_block(), ext4_split_extent_at(),
577  * ext4_ext_insert_extent(), and ext4_ext_create_new_leaf().
578  * EXT4_EX_NOCACHE is used to indicate that the we shouldn't be
579  * caching the extents when reading from the extent tree while a
580  * truncate or punch hole operation is in progress.
581  */
582 #define EXT4_EX_NOCACHE                         0x40000000
583 #define EXT4_EX_FORCE_CACHE                     0x20000000
584 
585 /*
586  * Flags used by ext4_free_blocks
587  */
588 #define EXT4_FREE_BLOCKS_METADATA       0x0001
589 #define EXT4_FREE_BLOCKS_FORGET         0x0002
590 #define EXT4_FREE_BLOCKS_VALIDATED      0x0004
591 #define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE 0x0008
592 #define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER   0x0010
593 #define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER    0x0020
594 
595 /* Encryption algorithms */
596 #define EXT4_ENCRYPTION_MODE_INVALID            0
597 #define EXT4_ENCRYPTION_MODE_AES_256_XTS        1
598 #define EXT4_ENCRYPTION_MODE_AES_256_GCM        2
599 #define EXT4_ENCRYPTION_MODE_AES_256_CBC        3
600 #define EXT4_ENCRYPTION_MODE_AES_256_CTS        4
601 
602 #include "ext4_crypto.h"
603 
604 /*
605  * ioctl commands
606  */
607 #define EXT4_IOC_GETFLAGS               FS_IOC_GETFLAGS
608 #define EXT4_IOC_SETFLAGS               FS_IOC_SETFLAGS
609 #define EXT4_IOC_GETVERSION             _IOR('f', 3, long)
610 #define EXT4_IOC_SETVERSION             _IOW('f', 4, long)
611 #define EXT4_IOC_GETVERSION_OLD         FS_IOC_GETVERSION
612 #define EXT4_IOC_SETVERSION_OLD         FS_IOC_SETVERSION
613 #define EXT4_IOC_GETRSVSZ               _IOR('f', 5, long)
614 #define EXT4_IOC_SETRSVSZ               _IOW('f', 6, long)
615 #define EXT4_IOC_GROUP_EXTEND           _IOW('f', 7, unsigned long)
616 #define EXT4_IOC_GROUP_ADD              _IOW('f', 8, struct ext4_new_group_input)
617 #define EXT4_IOC_MIGRATE                _IO('f', 9)
618  /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */
619  /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */
620 #define EXT4_IOC_ALLOC_DA_BLKS          _IO('f', 12)
621 #define EXT4_IOC_MOVE_EXT               _IOWR('f', 15, struct move_extent)
622 #define EXT4_IOC_RESIZE_FS              _IOW('f', 16, __u64)
623 #define EXT4_IOC_SWAP_BOOT              _IO('f', 17)
624 #define EXT4_IOC_PRECACHE_EXTENTS       _IO('f', 18)
625 #define EXT4_IOC_SET_ENCRYPTION_POLICY  _IOR('f', 19, struct ext4_encryption_policy)
626 #define EXT4_IOC_GET_ENCRYPTION_PWSALT  _IOW('f', 20, __u8[16])
627 #define EXT4_IOC_GET_ENCRYPTION_POLICY  _IOW('f', 21, struct ext4_encryption_policy)
628 
629 #ifndef FS_IOC_FSGETXATTR
630 /* Until the uapi changes get merged for project quota... */
631 
632 #define FS_IOC_FSGETXATTR               _IOR('X', 31, struct fsxattr)
633 #define FS_IOC_FSSETXATTR               _IOW('X', 32, struct fsxattr)
634 
635 /*
636  * Structure for FS_IOC_FSGETXATTR and FS_IOC_FSSETXATTR.
637  */
638 struct fsxattr {
639         __u32           fsx_xflags;     /* xflags field value (get/set) */
640         __u32           fsx_extsize;    /* extsize field value (get/set)*/
641         __u32           fsx_nextents;   /* nextents field value (get)   */
642         __u32           fsx_projid;     /* project identifier (get/set) */
643         unsigned char   fsx_pad[12];
644 };
645 
646 /*
647  * Flags for the fsx_xflags field
648  */
649 #define FS_XFLAG_REALTIME       0x00000001      /* data in realtime volume */
650 #define FS_XFLAG_PREALLOC       0x00000002      /* preallocated file extents */
651 #define FS_XFLAG_IMMUTABLE      0x00000008      /* file cannot be modified */
652 #define FS_XFLAG_APPEND         0x00000010      /* all writes append */
653 #define FS_XFLAG_SYNC           0x00000020      /* all writes synchronous */
654 #define FS_XFLAG_NOATIME        0x00000040      /* do not update access time */
655 #define FS_XFLAG_NODUMP         0x00000080      /* do not include in backups */
656 #define FS_XFLAG_RTINHERIT      0x00000100      /* create with rt bit set */
657 #define FS_XFLAG_PROJINHERIT    0x00000200      /* create with parents projid */
658 #define FS_XFLAG_NOSYMLINKS     0x00000400      /* disallow symlink creation */
659 #define FS_XFLAG_EXTSIZE        0x00000800      /* extent size allocator hint */
660 #define FS_XFLAG_EXTSZINHERIT   0x00001000      /* inherit inode extent size */
661 #define FS_XFLAG_NODEFRAG       0x00002000      /* do not defragment */
662 #define FS_XFLAG_FILESTREAM     0x00004000      /* use filestream allocator */
663 #define FS_XFLAG_HASATTR        0x80000000      /* no DIFLAG for this */
664 #endif /* !defined(FS_IOC_FSGETXATTR) */
665 
666 #define EXT4_IOC_FSGETXATTR             FS_IOC_FSGETXATTR
667 #define EXT4_IOC_FSSETXATTR             FS_IOC_FSSETXATTR
668 
669 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
670 /*
671  * ioctl commands in 32 bit emulation
672  */
673 #define EXT4_IOC32_GETFLAGS             FS_IOC32_GETFLAGS
674 #define EXT4_IOC32_SETFLAGS             FS_IOC32_SETFLAGS
675 #define EXT4_IOC32_GETVERSION           _IOR('f', 3, int)
676 #define EXT4_IOC32_SETVERSION           _IOW('f', 4, int)
677 #define EXT4_IOC32_GETRSVSZ             _IOR('f', 5, int)
678 #define EXT4_IOC32_SETRSVSZ             _IOW('f', 6, int)
679 #define EXT4_IOC32_GROUP_EXTEND         _IOW('f', 7, unsigned int)
680 #define EXT4_IOC32_GROUP_ADD            _IOW('f', 8, struct compat_ext4_new_group_input)
681 #define EXT4_IOC32_GETVERSION_OLD       FS_IOC32_GETVERSION
682 #define EXT4_IOC32_SETVERSION_OLD       FS_IOC32_SETVERSION
683 #endif
684 
685 /* Max physical block we can address w/o extents */
686 #define EXT4_MAX_BLOCK_FILE_PHYS        0xFFFFFFFF
687 
688 /*
689  * Structure of an inode on the disk
690  */
691 struct ext4_inode {
692         __le16  i_mode;         /* File mode */
693         __le16  i_uid;          /* Low 16 bits of Owner Uid */
694         __le32  i_size_lo;      /* Size in bytes */
695         __le32  i_atime;        /* Access time */
696         __le32  i_ctime;        /* Inode Change time */
697         __le32  i_mtime;        /* Modification time */
698         __le32  i_dtime;        /* Deletion Time */
699         __le16  i_gid;          /* Low 16 bits of Group Id */
700         __le16  i_links_count;  /* Links count */
701         __le32  i_blocks_lo;    /* Blocks count */
702         __le32  i_flags;        /* File flags */
703         union {
704                 struct {
705                         __le32  l_i_version;
706                 } linux1;
707                 struct {
708                         __u32  h_i_translator;
709                 } hurd1;
710                 struct {
711                         __u32  m_i_reserved1;
712                 } masix1;
713         } osd1;                         /* OS dependent 1 */
714         __le32  i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
715         __le32  i_generation;   /* File version (for NFS) */
716         __le32  i_file_acl_lo;  /* File ACL */
717         __le32  i_size_high;
718         __le32  i_obso_faddr;   /* Obsoleted fragment address */
719         union {
720                 struct {
721                         __le16  l_i_blocks_high; /* were l_i_reserved1 */
722                         __le16  l_i_file_acl_high;
723                         __le16  l_i_uid_high;   /* these 2 fields */
724                         __le16  l_i_gid_high;   /* were reserved2[0] */
725                         __le16  l_i_checksum_lo;/* crc32c(uuid+inum+inode) LE */
726                         __le16  l_i_reserved;
727                 } linux2;
728                 struct {
729                         __le16  h_i_reserved1;  /* Obsoleted fragment number/size which are removed in ext4 */
730                         __u16   h_i_mode_high;
731                         __u16   h_i_uid_high;
732                         __u16   h_i_gid_high;
733                         __u32   h_i_author;
734                 } hurd2;
735                 struct {
736                         __le16  h_i_reserved1;  /* Obsoleted fragment number/size which are removed in ext4 */
737                         __le16  m_i_file_acl_high;
738                         __u32   m_i_reserved2[2];
739                 } masix2;
740         } osd2;                         /* OS dependent 2 */
741         __le16  i_extra_isize;
742         __le16  i_checksum_hi;  /* crc32c(uuid+inum+inode) BE */
743         __le32  i_ctime_extra;  /* extra Change time      (nsec << 2 | epoch) */
744         __le32  i_mtime_extra;  /* extra Modification time(nsec << 2 | epoch) */
745         __le32  i_atime_extra;  /* extra Access time      (nsec << 2 | epoch) */
746         __le32  i_crtime;       /* File Creation time */
747         __le32  i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */
748         __le32  i_version_hi;   /* high 32 bits for 64-bit version */
749         __le32  i_projid;       /* Project ID */
750 };
751 
752 struct move_extent {
753         __u32 reserved;         /* should be zero */
754         __u32 donor_fd;         /* donor file descriptor */
755         __u64 orig_start;       /* logical start offset in block for orig */
756         __u64 donor_start;      /* logical start offset in block for donor */
757         __u64 len;              /* block length to be moved */
758         __u64 moved_len;        /* moved block length */
759 };
760 
761 #define EXT4_EPOCH_BITS 2
762 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
763 #define EXT4_NSEC_MASK  (~0UL << EXT4_EPOCH_BITS)
764 
765 /*
766  * Extended fields will fit into an inode if the filesystem was formatted
767  * with large inodes (-I 256 or larger) and there are not currently any EAs
768  * consuming all of the available space. For new inodes we always reserve
769  * enough space for the kernel's known extended fields, but for inodes
770  * created with an old kernel this might not have been the case. None of
771  * the extended inode fields is critical for correct filesystem operation.
772  * This macro checks if a certain field fits in the inode. Note that
773  * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
774  */
775 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field)   \
776         ((offsetof(typeof(*ext4_inode), field) +        \
777           sizeof((ext4_inode)->field))                  \
778         <= (EXT4_GOOD_OLD_INODE_SIZE +                  \
779             (einode)->i_extra_isize))                   \
780 
781 /*
782  * We use an encoding that preserves the times for extra epoch "00":
783  *
784  * extra  msb of                         adjust for signed
785  * epoch  32-bit                         32-bit tv_sec to
786  * bits   time    decoded 64-bit tv_sec  64-bit tv_sec      valid time range
787  * 0 0    1    -0x80000000..-0x00000001  0x000000000 1901-12-13..1969-12-31
788  * 0 0    0    0x000000000..0x07fffffff  0x000000000 1970-01-01..2038-01-19
789  * 0 1    1    0x080000000..0x0ffffffff  0x100000000 2038-01-19..2106-02-07
790  * 0 1    0    0x100000000..0x17fffffff  0x100000000 2106-02-07..2174-02-25
791  * 1 0    1    0x180000000..0x1ffffffff  0x200000000 2174-02-25..2242-03-16
792  * 1 0    0    0x200000000..0x27fffffff  0x200000000 2242-03-16..2310-04-04
793  * 1 1    1    0x280000000..0x2ffffffff  0x300000000 2310-04-04..2378-04-22
794  * 1 1    0    0x300000000..0x37fffffff  0x300000000 2378-04-22..2446-05-10
795  *
796  * Note that previous versions of the kernel on 64-bit systems would
797  * incorrectly use extra epoch bits 1,1 for dates between 1901 and
798  * 1970.  e2fsck will correct this, assuming that it is run on the
799  * affected filesystem before 2242.
800  */
801 
802 static inline __le32 ext4_encode_extra_time(struct timespec *time)
803 {
804         u32 extra = sizeof(time->tv_sec) > 4 ?
805                 ((time->tv_sec - (s32)time->tv_sec) >> 32) & EXT4_EPOCH_MASK : 0;
806         return cpu_to_le32(extra | (time->tv_nsec << EXT4_EPOCH_BITS));
807 }
808 
809 static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra)
810 {
811         if (unlikely(sizeof(time->tv_sec) > 4 &&
812                         (extra & cpu_to_le32(EXT4_EPOCH_MASK)))) {
813 #if LINUX_VERSION_CODE < KERNEL_VERSION(4,20,0)
814                 /* Handle legacy encoding of pre-1970 dates with epoch
815                  * bits 1,1.  We assume that by kernel version 4.20,
816                  * everyone will have run fsck over the affected
817                  * filesystems to correct the problem.  (This
818                  * backwards compatibility may be removed before this
819                  * time, at the discretion of the ext4 developers.)
820                  */
821                 u64 extra_bits = le32_to_cpu(extra) & EXT4_EPOCH_MASK;
822                 if (extra_bits == 3 && ((time->tv_sec) & 0x80000000) != 0)
823                         extra_bits = 0;
824                 time->tv_sec += extra_bits << 32;
825 #else
826                 time->tv_sec += (u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) << 32;
827 #endif
828         }
829         time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS;
830 }
831 
832 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode)                          \
833 do {                                                                           \
834         (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec);               \
835         if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra))     \
836                 (raw_inode)->xtime ## _extra =                                 \
837                                 ext4_encode_extra_time(&(inode)->xtime);       \
838 } while (0)
839 
840 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode)                        \
841 do {                                                                           \
842         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime))                      \
843                 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec);      \
844         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra))            \
845                 (raw_inode)->xtime ## _extra =                                 \
846                                 ext4_encode_extra_time(&(einode)->xtime);      \
847 } while (0)
848 
849 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode)                          \
850 do {                                                                           \
851         (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime);       \
852         if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra))     \
853                 ext4_decode_extra_time(&(inode)->xtime,                        \
854                                        raw_inode->xtime ## _extra);            \
855         else                                                                   \
856                 (inode)->xtime.tv_nsec = 0;                                    \
857 } while (0)
858 
859 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode)                        \
860 do {                                                                           \
861         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime))                      \
862                 (einode)->xtime.tv_sec =                                       \
863                         (signed)le32_to_cpu((raw_inode)->xtime);               \
864         else                                                                   \
865                 (einode)->xtime.tv_sec = 0;                                    \
866         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra))            \
867                 ext4_decode_extra_time(&(einode)->xtime,                       \
868                                        raw_inode->xtime ## _extra);            \
869         else                                                                   \
870                 (einode)->xtime.tv_nsec = 0;                                   \
871 } while (0)
872 
873 #define i_disk_version osd1.linux1.l_i_version
874 
875 #if defined(__KERNEL__) || defined(__linux__)
876 #define i_reserved1     osd1.linux1.l_i_reserved1
877 #define i_file_acl_high osd2.linux2.l_i_file_acl_high
878 #define i_blocks_high   osd2.linux2.l_i_blocks_high
879 #define i_uid_low       i_uid
880 #define i_gid_low       i_gid
881 #define i_uid_high      osd2.linux2.l_i_uid_high
882 #define i_gid_high      osd2.linux2.l_i_gid_high
883 #define i_checksum_lo   osd2.linux2.l_i_checksum_lo
884 
885 #elif defined(__GNU__)
886 
887 #define i_translator    osd1.hurd1.h_i_translator
888 #define i_uid_high      osd2.hurd2.h_i_uid_high
889 #define i_gid_high      osd2.hurd2.h_i_gid_high
890 #define i_author        osd2.hurd2.h_i_author
891 
892 #elif defined(__masix__)
893 
894 #define i_reserved1     osd1.masix1.m_i_reserved1
895 #define i_file_acl_high osd2.masix2.m_i_file_acl_high
896 #define i_reserved2     osd2.masix2.m_i_reserved2
897 
898 #endif /* defined(__KERNEL__) || defined(__linux__) */
899 
900 #include "extents_status.h"
901 
902 /*
903  * fourth extended file system inode data in memory
904  */
905 struct ext4_inode_info {
906         __le32  i_data[15];     /* unconverted */
907         __u32   i_dtime;
908         ext4_fsblk_t    i_file_acl;
909 
910         /*
911          * i_block_group is the number of the block group which contains
912          * this file's inode.  Constant across the lifetime of the inode,
913          * it is ued for making block allocation decisions - we try to
914          * place a file's data blocks near its inode block, and new inodes
915          * near to their parent directory's inode.
916          */
917         ext4_group_t    i_block_group;
918         ext4_lblk_t     i_dir_start_lookup;
919 #if (BITS_PER_LONG < 64)
920         unsigned long   i_state_flags;          /* Dynamic state flags */
921 #endif
922         unsigned long   i_flags;
923 
924         /*
925          * Extended attributes can be read independently of the main file
926          * data. Taking i_mutex even when reading would cause contention
927          * between readers of EAs and writers of regular file data, so
928          * instead we synchronize on xattr_sem when reading or changing
929          * EAs.
930          */
931         struct rw_semaphore xattr_sem;
932 
933         struct list_head i_orphan;      /* unlinked but open inodes */
934 
935         /*
936          * i_disksize keeps track of what the inode size is ON DISK, not
937          * in memory.  During truncate, i_size is set to the new size by
938          * the VFS prior to calling ext4_truncate(), but the filesystem won't
939          * set i_disksize to 0 until the truncate is actually under way.
940          *
941          * The intent is that i_disksize always represents the blocks which
942          * are used by this file.  This allows recovery to restart truncate
943          * on orphans if we crash during truncate.  We actually write i_disksize
944          * into the on-disk inode when writing inodes out, instead of i_size.
945          *
946          * The only time when i_disksize and i_size may be different is when
947          * a truncate is in progress.  The only things which change i_disksize
948          * are ext4_get_block (growth) and ext4_truncate (shrinkth).
949          */
950         loff_t  i_disksize;
951 
952         /*
953          * i_data_sem is for serialising ext4_truncate() against
954          * ext4_getblock().  In the 2.4 ext2 design, great chunks of inode's
955          * data tree are chopped off during truncate. We can't do that in
956          * ext4 because whenever we perform intermediate commits during
957          * truncate, the inode and all the metadata blocks *must* be in a
958          * consistent state which allows truncation of the orphans to restart
959          * during recovery.  Hence we must fix the get_block-vs-truncate race
960          * by other means, so we have i_data_sem.
961          */
962         struct rw_semaphore i_data_sem;
963         /*
964          * i_mmap_sem is for serializing page faults with truncate / punch hole
965          * operations. We have to make sure that new page cannot be faulted in
966          * a section of the inode that is being punched. We cannot easily use
967          * i_data_sem for this since we need protection for the whole punch
968          * operation and i_data_sem ranks below transaction start so we have
969          * to occasionally drop it.
970          */
971         struct rw_semaphore i_mmap_sem;
972         struct inode vfs_inode;
973         struct jbd2_inode *jinode;
974 
975         spinlock_t i_raw_lock;  /* protects updates to the raw inode */
976 
977         /*
978          * File creation time. Its function is same as that of
979          * struct timespec i_{a,c,m}time in the generic inode.
980          */
981         struct timespec i_crtime;
982 
983         /* mballoc */
984         struct list_head i_prealloc_list;
985         spinlock_t i_prealloc_lock;
986 
987         /* extents status tree */
988         struct ext4_es_tree i_es_tree;
989         rwlock_t i_es_lock;
990         struct list_head i_es_list;
991         unsigned int i_es_all_nr;       /* protected by i_es_lock */
992         unsigned int i_es_shk_nr;       /* protected by i_es_lock */
993         ext4_lblk_t i_es_shrink_lblk;   /* Offset where we start searching for
994                                            extents to shrink. Protected by
995                                            i_es_lock  */
996 
997         /* ialloc */
998         ext4_group_t    i_last_alloc_group;
999 
1000         /* allocation reservation info for delalloc */
1001         /* In case of bigalloc, these refer to clusters rather than blocks */
1002         unsigned int i_reserved_data_blocks;
1003         unsigned int i_reserved_meta_blocks;
1004         unsigned int i_allocated_meta_blocks;
1005         ext4_lblk_t i_da_metadata_calc_last_lblock;
1006         int i_da_metadata_calc_len;
1007 
1008         /* on-disk additional length */
1009         __u16 i_extra_isize;
1010 
1011         /* Indicate the inline data space. */
1012         u16 i_inline_off;
1013         u16 i_inline_size;
1014 
1015 #ifdef CONFIG_QUOTA
1016         /* quota space reservation, managed internally by quota code */
1017         qsize_t i_reserved_quota;
1018 #endif
1019 
1020         /* Lock protecting lists below */
1021         spinlock_t i_completed_io_lock;
1022         /*
1023          * Completed IOs that need unwritten extents handling and have
1024          * transaction reserved
1025          */
1026         struct list_head i_rsv_conversion_list;
1027         /*
1028          * Completed IOs that need unwritten extents handling and don't have
1029          * transaction reserved
1030          */
1031         atomic_t i_ioend_count; /* Number of outstanding io_end structs */
1032         atomic_t i_unwritten; /* Nr. of inflight conversions pending */
1033         struct work_struct i_rsv_conversion_work;
1034 
1035         spinlock_t i_block_reservation_lock;
1036 
1037         /*
1038          * Transactions that contain inode's metadata needed to complete
1039          * fsync and fdatasync, respectively.
1040          */
1041         tid_t i_sync_tid;
1042         tid_t i_datasync_tid;
1043 
1044 #ifdef CONFIG_QUOTA
1045         struct dquot *i_dquot[MAXQUOTAS];
1046 #endif
1047 
1048         /* Precomputed uuid+inum+igen checksum for seeding inode checksums */
1049         __u32 i_csum_seed;
1050 
1051 #ifdef CONFIG_EXT4_FS_ENCRYPTION
1052         /* Encryption params */
1053         struct ext4_crypt_info *i_crypt_info;
1054 #endif
1055         kprojid_t i_projid;
1056 };
1057 
1058 /*
1059  * File system states
1060  */
1061 #define EXT4_VALID_FS                   0x0001  /* Unmounted cleanly */
1062 #define EXT4_ERROR_FS                   0x0002  /* Errors detected */
1063 #define EXT4_ORPHAN_FS                  0x0004  /* Orphans being recovered */
1064 
1065 /*
1066  * Misc. filesystem flags
1067  */
1068 #define EXT2_FLAGS_SIGNED_HASH          0x0001  /* Signed dirhash in use */
1069 #define EXT2_FLAGS_UNSIGNED_HASH        0x0002  /* Unsigned dirhash in use */
1070 #define EXT2_FLAGS_TEST_FILESYS         0x0004  /* to test development code */
1071 
1072 /*
1073  * Mount flags set via mount options or defaults
1074  */
1075 #define EXT4_MOUNT_GRPID                0x00004 /* Create files with directory's group */
1076 #define EXT4_MOUNT_DEBUG                0x00008 /* Some debugging messages */
1077 #define EXT4_MOUNT_ERRORS_CONT          0x00010 /* Continue on errors */
1078 #define EXT4_MOUNT_ERRORS_RO            0x00020 /* Remount fs ro on errors */
1079 #define EXT4_MOUNT_ERRORS_PANIC         0x00040 /* Panic on errors */
1080 #define EXT4_MOUNT_ERRORS_MASK          0x00070
1081 #define EXT4_MOUNT_MINIX_DF             0x00080 /* Mimics the Minix statfs */
1082 #define EXT4_MOUNT_NOLOAD               0x00100 /* Don't use existing journal*/
1083 #ifdef CONFIG_FS_DAX
1084 #define EXT4_MOUNT_DAX                  0x00200 /* Direct Access */
1085 #else
1086 #define EXT4_MOUNT_DAX                  0
1087 #endif
1088 #define EXT4_MOUNT_DATA_FLAGS           0x00C00 /* Mode for data writes: */
1089 #define EXT4_MOUNT_JOURNAL_DATA         0x00400 /* Write data to journal */
1090 #define EXT4_MOUNT_ORDERED_DATA         0x00800 /* Flush data before commit */
1091 #define EXT4_MOUNT_WRITEBACK_DATA       0x00C00 /* No data ordering */
1092 #define EXT4_MOUNT_UPDATE_JOURNAL       0x01000 /* Update the journal format */
1093 #define EXT4_MOUNT_NO_UID32             0x02000  /* Disable 32-bit UIDs */
1094 #define EXT4_MOUNT_XATTR_USER           0x04000 /* Extended user attributes */
1095 #define EXT4_MOUNT_POSIX_ACL            0x08000 /* POSIX Access Control Lists */
1096 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC     0x10000 /* No auto delalloc mapping */
1097 #define EXT4_MOUNT_BARRIER              0x20000 /* Use block barriers */
1098 #define EXT4_MOUNT_QUOTA                0x80000 /* Some quota option set */
1099 #define EXT4_MOUNT_USRQUOTA             0x100000 /* "old" user quota */
1100 #define EXT4_MOUNT_GRPQUOTA             0x200000 /* "old" group quota */
1101 #define EXT4_MOUNT_DIOREAD_NOLOCK       0x400000 /* Enable support for dio read nolocking */
1102 #define EXT4_MOUNT_JOURNAL_CHECKSUM     0x800000 /* Journal checksums */
1103 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */
1104 #define EXT4_MOUNT_DELALLOC             0x8000000 /* Delalloc support */
1105 #define EXT4_MOUNT_DATA_ERR_ABORT       0x10000000 /* Abort on file data write */
1106 #define EXT4_MOUNT_BLOCK_VALIDITY       0x20000000 /* Block validity checking */
1107 #define EXT4_MOUNT_DISCARD              0x40000000 /* Issue DISCARD requests */
1108 #define EXT4_MOUNT_INIT_INODE_TABLE     0x80000000 /* Initialize uninitialized itables */
1109 
1110 /*
1111  * Mount flags set either automatically (could not be set by mount option)
1112  * based on per file system feature or property or in special cases such as
1113  * distinguishing between explicit mount option definition and default.
1114  */
1115 #define EXT4_MOUNT2_EXPLICIT_DELALLOC   0x00000001 /* User explicitly
1116                                                       specified delalloc */
1117 #define EXT4_MOUNT2_STD_GROUP_SIZE      0x00000002 /* We have standard group
1118                                                       size of blocksize * 8
1119                                                       blocks */
1120 #define EXT4_MOUNT2_HURD_COMPAT         0x00000004 /* Support HURD-castrated
1121                                                       file systems */
1122 
1123 #define EXT4_MOUNT2_EXPLICIT_JOURNAL_CHECKSUM   0x00000008 /* User explicitly
1124                                                 specified journal checksum */
1125 
1126 #define clear_opt(sb, opt)              EXT4_SB(sb)->s_mount_opt &= \
1127                                                 ~EXT4_MOUNT_##opt
1128 #define set_opt(sb, opt)                EXT4_SB(sb)->s_mount_opt |= \
1129                                                 EXT4_MOUNT_##opt
1130 #define test_opt(sb, opt)               (EXT4_SB(sb)->s_mount_opt & \
1131                                          EXT4_MOUNT_##opt)
1132 
1133 #define clear_opt2(sb, opt)             EXT4_SB(sb)->s_mount_opt2 &= \
1134                                                 ~EXT4_MOUNT2_##opt
1135 #define set_opt2(sb, opt)               EXT4_SB(sb)->s_mount_opt2 |= \
1136                                                 EXT4_MOUNT2_##opt
1137 #define test_opt2(sb, opt)              (EXT4_SB(sb)->s_mount_opt2 & \
1138                                          EXT4_MOUNT2_##opt)
1139 
1140 #define ext4_test_and_set_bit           __test_and_set_bit_le
1141 #define ext4_set_bit                    __set_bit_le
1142 #define ext4_set_bit_atomic             ext2_set_bit_atomic
1143 #define ext4_test_and_clear_bit         __test_and_clear_bit_le
1144 #define ext4_clear_bit                  __clear_bit_le
1145 #define ext4_clear_bit_atomic           ext2_clear_bit_atomic
1146 #define ext4_test_bit                   test_bit_le
1147 #define ext4_find_next_zero_bit         find_next_zero_bit_le
1148 #define ext4_find_next_bit              find_next_bit_le
1149 
1150 extern void ext4_set_bits(void *bm, int cur, int len);
1151 
1152 /*
1153  * Maximal mount counts between two filesystem checks
1154  */
1155 #define EXT4_DFL_MAX_MNT_COUNT          20      /* Allow 20 mounts */
1156 #define EXT4_DFL_CHECKINTERVAL          0       /* Don't use interval check */
1157 
1158 /*
1159  * Behaviour when detecting errors
1160  */
1161 #define EXT4_ERRORS_CONTINUE            1       /* Continue execution */
1162 #define EXT4_ERRORS_RO                  2       /* Remount fs read-only */
1163 #define EXT4_ERRORS_PANIC               3       /* Panic */
1164 #define EXT4_ERRORS_DEFAULT             EXT4_ERRORS_CONTINUE
1165 
1166 /* Metadata checksum algorithm codes */
1167 #define EXT4_CRC32C_CHKSUM              1
1168 
1169 /*
1170  * Structure of the super block
1171  */
1172 struct ext4_super_block {
1173 /*00*/  __le32  s_inodes_count;         /* Inodes count */
1174         __le32  s_blocks_count_lo;      /* Blocks count */
1175         __le32  s_r_blocks_count_lo;    /* Reserved blocks count */
1176         __le32  s_free_blocks_count_lo; /* Free blocks count */
1177 /*10*/  __le32  s_free_inodes_count;    /* Free inodes count */
1178         __le32  s_first_data_block;     /* First Data Block */
1179         __le32  s_log_block_size;       /* Block size */
1180         __le32  s_log_cluster_size;     /* Allocation cluster size */
1181 /*20*/  __le32  s_blocks_per_group;     /* # Blocks per group */
1182         __le32  s_clusters_per_group;   /* # Clusters per group */
1183         __le32  s_inodes_per_group;     /* # Inodes per group */
1184         __le32  s_mtime;                /* Mount time */
1185 /*30*/  __le32  s_wtime;                /* Write time */
1186         __le16  s_mnt_count;            /* Mount count */
1187         __le16  s_max_mnt_count;        /* Maximal mount count */
1188         __le16  s_magic;                /* Magic signature */
1189         __le16  s_state;                /* File system state */
1190         __le16  s_errors;               /* Behaviour when detecting errors */
1191         __le16  s_minor_rev_level;      /* minor revision level */
1192 /*40*/  __le32  s_lastcheck;            /* time of last check */
1193         __le32  s_checkinterval;        /* max. time between checks */
1194         __le32  s_creator_os;           /* OS */
1195         __le32  s_rev_level;            /* Revision level */
1196 /*50*/  __le16  s_def_resuid;           /* Default uid for reserved blocks */
1197         __le16  s_def_resgid;           /* Default gid for reserved blocks */
1198         /*
1199          * These fields are for EXT4_DYNAMIC_REV superblocks only.
1200          *
1201          * Note: the difference between the compatible feature set and
1202          * the incompatible feature set is that if there is a bit set
1203          * in the incompatible feature set that the kernel doesn't
1204          * know about, it should refuse to mount the filesystem.
1205          *
1206          * e2fsck's requirements are more strict; if it doesn't know
1207          * about a feature in either the compatible or incompatible
1208          * feature set, it must abort and not try to meddle with
1209          * things it doesn't understand...
1210          */
1211         __le32  s_first_ino;            /* First non-reserved inode */
1212         __le16  s_inode_size;           /* size of inode structure */
1213         __le16  s_block_group_nr;       /* block group # of this superblock */
1214         __le32  s_feature_compat;       /* compatible feature set */
1215 /*60*/  __le32  s_feature_incompat;     /* incompatible feature set */
1216         __le32  s_feature_ro_compat;    /* readonly-compatible feature set */
1217 /*68*/  __u8    s_uuid[16];             /* 128-bit uuid for volume */
1218 /*78*/  char    s_volume_name[16];      /* volume name */
1219 /*88*/  char    s_last_mounted[64];     /* directory where last mounted */
1220 /*C8*/  __le32  s_algorithm_usage_bitmap; /* For compression */
1221         /*
1222          * Performance hints.  Directory preallocation should only
1223          * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
1224          */
1225         __u8    s_prealloc_blocks;      /* Nr of blocks to try to preallocate*/
1226         __u8    s_prealloc_dir_blocks;  /* Nr to preallocate for dirs */
1227         __le16  s_reserved_gdt_blocks;  /* Per group desc for online growth */
1228         /*
1229          * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
1230          */
1231 /*D0*/  __u8    s_journal_uuid[16];     /* uuid of journal superblock */
1232 /*E0*/  __le32  s_journal_inum;         /* inode number of journal file */
1233         __le32  s_journal_dev;          /* device number of journal file */
1234         __le32  s_last_orphan;          /* start of list of inodes to delete */
1235         __le32  s_hash_seed[4];         /* HTREE hash seed */
1236         __u8    s_def_hash_version;     /* Default hash version to use */
1237         __u8    s_jnl_backup_type;
1238         __le16  s_desc_size;            /* size of group descriptor */
1239 /*100*/ __le32  s_default_mount_opts;
1240         __le32  s_first_meta_bg;        /* First metablock block group */
1241         __le32  s_mkfs_time;            /* When the filesystem was created */
1242         __le32  s_jnl_blocks[17];       /* Backup of the journal inode */
1243         /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
1244 /*150*/ __le32  s_blocks_count_hi;      /* Blocks count */
1245         __le32  s_r_blocks_count_hi;    /* Reserved blocks count */
1246         __le32  s_free_blocks_count_hi; /* Free blocks count */
1247         __le16  s_min_extra_isize;      /* All inodes have at least # bytes */
1248         __le16  s_want_extra_isize;     /* New inodes should reserve # bytes */
1249         __le32  s_flags;                /* Miscellaneous flags */
1250         __le16  s_raid_stride;          /* RAID stride */
1251         __le16  s_mmp_update_interval;  /* # seconds to wait in MMP checking */
1252         __le64  s_mmp_block;            /* Block for multi-mount protection */
1253         __le32  s_raid_stripe_width;    /* blocks on all data disks (N*stride)*/
1254         __u8    s_log_groups_per_flex;  /* FLEX_BG group size */
1255         __u8    s_checksum_type;        /* metadata checksum algorithm used */
1256         __u8    s_encryption_level;     /* versioning level for encryption */
1257         __u8    s_reserved_pad;         /* Padding to next 32bits */
1258         __le64  s_kbytes_written;       /* nr of lifetime kilobytes written */
1259         __le32  s_snapshot_inum;        /* Inode number of active snapshot */
1260         __le32  s_snapshot_id;          /* sequential ID of active snapshot */
1261         __le64  s_snapshot_r_blocks_count; /* reserved blocks for active
1262                                               snapshot's future use */
1263         __le32  s_snapshot_list;        /* inode number of the head of the
1264                                            on-disk snapshot list */
1265 #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count)
1266         __le32  s_error_count;          /* number of fs errors */
1267         __le32  s_first_error_time;     /* first time an error happened */
1268         __le32  s_first_error_ino;      /* inode involved in first error */
1269         __le64  s_first_error_block;    /* block involved of first error */
1270         __u8    s_first_error_func[32]; /* function where the error happened */
1271         __le32  s_first_error_line;     /* line number where error happened */
1272         __le32  s_last_error_time;      /* most recent time of an error */
1273         __le32  s_last_error_ino;       /* inode involved in last error */
1274         __le32  s_last_error_line;      /* line number where error happened */
1275         __le64  s_last_error_block;     /* block involved of last error */
1276         __u8    s_last_error_func[32];  /* function where the error happened */
1277 #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts)
1278         __u8    s_mount_opts[64];
1279         __le32  s_usr_quota_inum;       /* inode for tracking user quota */
1280         __le32  s_grp_quota_inum;       /* inode for tracking group quota */
1281         __le32  s_overhead_clusters;    /* overhead blocks/clusters in fs */
1282         __le32  s_backup_bgs[2];        /* groups with sparse_super2 SBs */
1283         __u8    s_encrypt_algos[4];     /* Encryption algorithms in use  */
1284         __u8    s_encrypt_pw_salt[16];  /* Salt used for string2key algorithm */
1285         __le32  s_lpf_ino;              /* Location of the lost+found inode */
1286         __le32  s_prj_quota_inum;       /* inode for tracking project quota */
1287         __le32  s_checksum_seed;        /* crc32c(uuid) if csum_seed set */
1288         __le32  s_reserved[98];         /* Padding to the end of the block */
1289         __le32  s_checksum;             /* crc32c(superblock) */
1290 };
1291 
1292 #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START)
1293 
1294 #ifdef __KERNEL__
1295 
1296 /*
1297  * run-time mount flags
1298  */
1299 #define EXT4_MF_MNTDIR_SAMPLED          0x0001
1300 #define EXT4_MF_FS_ABORTED              0x0002  /* Fatal error detected */
1301 #define EXT4_MF_TEST_DUMMY_ENCRYPTION   0x0004
1302 
1303 #ifdef CONFIG_EXT4_FS_ENCRYPTION
1304 #define DUMMY_ENCRYPTION_ENABLED(sbi) (unlikely((sbi)->s_mount_flags & \
1305                                                 EXT4_MF_TEST_DUMMY_ENCRYPTION))
1306 #else
1307 #define DUMMY_ENCRYPTION_ENABLED(sbi) (0)
1308 #endif
1309 
1310 /* Number of quota types we support */
1311 #define EXT4_MAXQUOTAS 3
1312 
1313 /*
1314  * fourth extended-fs super-block data in memory
1315  */
1316 struct ext4_sb_info {
1317         unsigned long s_desc_size;      /* Size of a group descriptor in bytes */
1318         unsigned long s_inodes_per_block;/* Number of inodes per block */
1319         unsigned long s_blocks_per_group;/* Number of blocks in a group */
1320         unsigned long s_clusters_per_group; /* Number of clusters in a group */
1321         unsigned long s_inodes_per_group;/* Number of inodes in a group */
1322         unsigned long s_itb_per_group;  /* Number of inode table blocks per group */
1323         unsigned long s_gdb_count;      /* Number of group descriptor blocks */
1324         unsigned long s_desc_per_block; /* Number of group descriptors per block */
1325         ext4_group_t s_groups_count;    /* Number of groups in the fs */
1326         ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */
1327         unsigned long s_overhead;  /* # of fs overhead clusters */
1328         unsigned int s_cluster_ratio;   /* Number of blocks per cluster */
1329         unsigned int s_cluster_bits;    /* log2 of s_cluster_ratio */
1330         loff_t s_bitmap_maxbytes;       /* max bytes for bitmap files */
1331         struct buffer_head * s_sbh;     /* Buffer containing the super block */
1332         struct ext4_super_block *s_es;  /* Pointer to the super block in the buffer */
1333         struct buffer_head **s_group_desc;
1334         unsigned int s_mount_opt;
1335         unsigned int s_mount_opt2;
1336         unsigned int s_mount_flags;
1337         unsigned int s_def_mount_opt;
1338         ext4_fsblk_t s_sb_block;
1339         atomic64_t s_resv_clusters;
1340         kuid_t s_resuid;
1341         kgid_t s_resgid;
1342         unsigned short s_mount_state;
1343         unsigned short s_pad;
1344         int s_addr_per_block_bits;
1345         int s_desc_per_block_bits;
1346         int s_inode_size;
1347         int s_first_ino;
1348         unsigned int s_inode_readahead_blks;
1349         unsigned int s_inode_goal;
1350         spinlock_t s_next_gen_lock;
1351         u32 s_next_generation;
1352         u32 s_hash_seed[4];
1353         int s_def_hash_version;
1354         int s_hash_unsigned;    /* 3 if hash should be signed, 0 if not */
1355         struct percpu_counter s_freeclusters_counter;
1356         struct percpu_counter s_freeinodes_counter;
1357         struct percpu_counter s_dirs_counter;
1358         struct percpu_counter s_dirtyclusters_counter;
1359         struct blockgroup_lock *s_blockgroup_lock;
1360         struct proc_dir_entry *s_proc;
1361         struct kobject s_kobj;
1362         struct completion s_kobj_unregister;
1363         struct super_block *s_sb;
1364 
1365         /* Journaling */
1366         struct journal_s *s_journal;
1367         struct list_head s_orphan;
1368         struct mutex s_orphan_lock;
1369         unsigned long s_resize_flags;           /* Flags indicating if there
1370                                                    is a resizer */
1371         unsigned long s_commit_interval;
1372         u32 s_max_batch_time;
1373         u32 s_min_batch_time;
1374         struct block_device *journal_bdev;
1375 #ifdef CONFIG_QUOTA
1376         char *s_qf_names[EXT4_MAXQUOTAS];       /* Names of quota files with journalled quota */
1377         int s_jquota_fmt;                       /* Format of quota to use */
1378 #endif
1379         unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */
1380         struct rb_root system_blks;
1381 
1382 #ifdef EXTENTS_STATS
1383         /* ext4 extents stats */
1384         unsigned long s_ext_min;
1385         unsigned long s_ext_max;
1386         unsigned long s_depth_max;
1387         spinlock_t s_ext_stats_lock;
1388         unsigned long s_ext_blocks;
1389         unsigned long s_ext_extents;
1390 #endif
1391 
1392         /* for buddy allocator */
1393         struct ext4_group_info ***s_group_info;
1394         struct inode *s_buddy_cache;
1395         spinlock_t s_md_lock;
1396         unsigned short *s_mb_offsets;
1397         unsigned int *s_mb_maxs;
1398         unsigned int s_group_info_size;
1399 
1400         /* tunables */
1401         unsigned long s_stripe;
1402         unsigned int s_mb_stream_request;
1403         unsigned int s_mb_max_to_scan;
1404         unsigned int s_mb_min_to_scan;
1405         unsigned int s_mb_stats;
1406         unsigned int s_mb_order2_reqs;
1407         unsigned int s_mb_group_prealloc;
1408         unsigned int s_max_dir_size_kb;
1409         /* where last allocation was done - for stream allocation */
1410         unsigned long s_mb_last_group;
1411         unsigned long s_mb_last_start;
1412 
1413         /* stats for buddy allocator */
1414         atomic_t s_bal_reqs;    /* number of reqs with len > 1 */
1415         atomic_t s_bal_success; /* we found long enough chunks */
1416         atomic_t s_bal_allocated;       /* in blocks */
1417         atomic_t s_bal_ex_scanned;      /* total extents scanned */
1418         atomic_t s_bal_goals;   /* goal hits */
1419         atomic_t s_bal_breaks;  /* too long searches */
1420         atomic_t s_bal_2orders; /* 2^order hits */
1421         spinlock_t s_bal_lock;
1422         unsigned long s_mb_buddies_generated;
1423         unsigned long long s_mb_generation_time;
1424         atomic_t s_mb_lost_chunks;
1425         atomic_t s_mb_preallocated;
1426         atomic_t s_mb_discarded;
1427         atomic_t s_lock_busy;
1428 
1429         /* locality groups */
1430         struct ext4_locality_group __percpu *s_locality_groups;
1431 
1432         /* for write statistics */
1433         unsigned long s_sectors_written_start;
1434         u64 s_kbytes_written;
1435 
1436         /* the size of zero-out chunk */
1437         unsigned int s_extent_max_zeroout_kb;
1438 
1439         unsigned int s_log_groups_per_flex;
1440         struct flex_groups *s_flex_groups;
1441         ext4_group_t s_flex_groups_allocated;
1442 
1443         /* workqueue for reserved extent conversions (buffered io) */
1444         struct workqueue_struct *rsv_conversion_wq;
1445 
1446         /* timer for periodic error stats printing */
1447         struct timer_list s_err_report;
1448 
1449         /* Lazy inode table initialization info */
1450         struct ext4_li_request *s_li_request;
1451         /* Wait multiplier for lazy initialization thread */
1452         unsigned int s_li_wait_mult;
1453 
1454         /* Kernel thread for multiple mount protection */
1455         struct task_struct *s_mmp_tsk;
1456 
1457         /* record the last minlen when FITRIM is called. */
1458         atomic_t s_last_trim_minblks;
1459 
1460         /* Reference to checksum algorithm driver via cryptoapi */
1461         struct crypto_shash *s_chksum_driver;
1462 
1463         /* Precomputed FS UUID checksum for seeding other checksums */
1464         __u32 s_csum_seed;
1465 
1466         /* Reclaim extents from extent status tree */
1467         struct shrinker s_es_shrinker;
1468         struct list_head s_es_list;     /* List of inodes with reclaimable extents */
1469         long s_es_nr_inode;
1470         struct ext4_es_stats s_es_stats;
1471         struct mb_cache *s_mb_cache;
1472         spinlock_t s_es_lock ____cacheline_aligned_in_smp;
1473 
1474         /* Ratelimit ext4 messages. */
1475         struct ratelimit_state s_err_ratelimit_state;
1476         struct ratelimit_state s_warning_ratelimit_state;
1477         struct ratelimit_state s_msg_ratelimit_state;
1478 };
1479 
1480 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb)
1481 {
1482         return sb->s_fs_info;
1483 }
1484 static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
1485 {
1486         return container_of(inode, struct ext4_inode_info, vfs_inode);
1487 }
1488 
1489 static inline struct timespec ext4_current_time(struct inode *inode)
1490 {
1491         return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ?
1492                 current_fs_time(inode->i_sb) : CURRENT_TIME_SEC;
1493 }
1494 
1495 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
1496 {
1497         return ino == EXT4_ROOT_INO ||
1498                 ino == EXT4_USR_QUOTA_INO ||
1499                 ino == EXT4_GRP_QUOTA_INO ||
1500                 ino == EXT4_BOOT_LOADER_INO ||
1501                 ino == EXT4_JOURNAL_INO ||
1502                 ino == EXT4_RESIZE_INO ||
1503                 (ino >= EXT4_FIRST_INO(sb) &&
1504                  ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
1505 }
1506 
1507 static inline void ext4_set_io_unwritten_flag(struct inode *inode,
1508                                               struct ext4_io_end *io_end)
1509 {
1510         if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) {
1511                 io_end->flag |= EXT4_IO_END_UNWRITTEN;
1512                 atomic_inc(&EXT4_I(inode)->i_unwritten);
1513         }
1514 }
1515 
1516 static inline ext4_io_end_t *ext4_inode_aio(struct inode *inode)
1517 {
1518         return inode->i_private;
1519 }
1520 
1521 static inline void ext4_inode_aio_set(struct inode *inode, ext4_io_end_t *io)
1522 {
1523         inode->i_private = io;
1524 }
1525 
1526 /*
1527  * Inode dynamic state flags
1528  */
1529 enum {
1530         EXT4_STATE_JDATA,               /* journaled data exists */
1531         EXT4_STATE_NEW,                 /* inode is newly created */
1532         EXT4_STATE_XATTR,               /* has in-inode xattrs */
1533         EXT4_STATE_NO_EXPAND,           /* No space for expansion */
1534         EXT4_STATE_DA_ALLOC_CLOSE,      /* Alloc DA blks on close */
1535         EXT4_STATE_EXT_MIGRATE,         /* Inode is migrating */
1536         EXT4_STATE_DIO_UNWRITTEN,       /* need convert on dio done*/
1537         EXT4_STATE_NEWENTRY,            /* File just added to dir */
1538         EXT4_STATE_DIOREAD_LOCK,        /* Disable support for dio read
1539                                            nolocking */
1540         EXT4_STATE_MAY_INLINE_DATA,     /* may have in-inode data */
1541         EXT4_STATE_ORDERED_MODE,        /* data=ordered mode */
1542         EXT4_STATE_EXT_PRECACHED,       /* extents have been precached */
1543 };
1544 
1545 #define EXT4_INODE_BIT_FNS(name, field, offset)                         \
1546 static inline int ext4_test_inode_##name(struct inode *inode, int bit)  \
1547 {                                                                       \
1548         return test_bit(bit + (offset), &EXT4_I(inode)->i_##field);     \
1549 }                                                                       \
1550 static inline void ext4_set_inode_##name(struct inode *inode, int bit)  \
1551 {                                                                       \
1552         set_bit(bit + (offset), &EXT4_I(inode)->i_##field);             \
1553 }                                                                       \
1554 static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \
1555 {                                                                       \
1556         clear_bit(bit + (offset), &EXT4_I(inode)->i_##field);           \
1557 }
1558 
1559 /* Add these declarations here only so that these functions can be
1560  * found by name.  Otherwise, they are very hard to locate. */
1561 static inline int ext4_test_inode_flag(struct inode *inode, int bit);
1562 static inline void ext4_set_inode_flag(struct inode *inode, int bit);
1563 static inline void ext4_clear_inode_flag(struct inode *inode, int bit);
1564 EXT4_INODE_BIT_FNS(flag, flags, 0)
1565 
1566 /* Add these declarations here only so that these functions can be
1567  * found by name.  Otherwise, they are very hard to locate. */
1568 static inline int ext4_test_inode_state(struct inode *inode, int bit);
1569 static inline void ext4_set_inode_state(struct inode *inode, int bit);
1570 static inline void ext4_clear_inode_state(struct inode *inode, int bit);
1571 #if (BITS_PER_LONG < 64)
1572 EXT4_INODE_BIT_FNS(state, state_flags, 0)
1573 
1574 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1575 {
1576         (ei)->i_state_flags = 0;
1577 }
1578 #else
1579 EXT4_INODE_BIT_FNS(state, flags, 32)
1580 
1581 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1582 {
1583         /* We depend on the fact that callers will set i_flags */
1584 }
1585 #endif
1586 #else
1587 /* Assume that user mode programs are passing in an ext4fs superblock, not
1588  * a kernel struct super_block.  This will allow us to call the feature-test
1589  * macros from user land. */
1590 #define EXT4_SB(sb)     (sb)
1591 #endif
1592 
1593 /*
1594  * Returns true if the inode is inode is encrypted
1595  */
1596 static inline int ext4_encrypted_inode(struct inode *inode)
1597 {
1598 #ifdef CONFIG_EXT4_FS_ENCRYPTION
1599         return ext4_test_inode_flag(inode, EXT4_INODE_ENCRYPT);
1600 #else
1601         return 0;
1602 #endif
1603 }
1604 
1605 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
1606 
1607 /*
1608  * Codes for operating systems
1609  */
1610 #define EXT4_OS_LINUX           0
1611 #define EXT4_OS_HURD            1
1612 #define EXT4_OS_MASIX           2
1613 #define EXT4_OS_FREEBSD         3
1614 #define EXT4_OS_LITES           4
1615 
1616 /*
1617  * Revision levels
1618  */
1619 #define EXT4_GOOD_OLD_REV       0       /* The good old (original) format */
1620 #define EXT4_DYNAMIC_REV        1       /* V2 format w/ dynamic inode sizes */
1621 
1622 #define EXT4_CURRENT_REV        EXT4_GOOD_OLD_REV
1623 #define EXT4_MAX_SUPP_REV       EXT4_DYNAMIC_REV
1624 
1625 #define EXT4_GOOD_OLD_INODE_SIZE 128
1626 
1627 /*
1628  * Feature set definitions
1629  */
1630 
1631 /* Use the ext4_{has,set,clear}_feature_* helpers; these will be removed */
1632 #define EXT4_HAS_COMPAT_FEATURE(sb,mask)                        \
1633         ((EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask)) != 0)
1634 #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask)                     \
1635         ((EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask)) != 0)
1636 #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask)                      \
1637         ((EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask)) != 0)
1638 #define EXT4_SET_COMPAT_FEATURE(sb,mask)                        \
1639         EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
1640 #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask)                     \
1641         EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
1642 #define EXT4_SET_INCOMPAT_FEATURE(sb,mask)                      \
1643         EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
1644 #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask)                      \
1645         EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
1646 #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask)                   \
1647         EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
1648 #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask)                    \
1649         EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
1650 
1651 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC        0x0001
1652 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES       0x0002
1653 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL         0x0004
1654 #define EXT4_FEATURE_COMPAT_EXT_ATTR            0x0008
1655 #define EXT4_FEATURE_COMPAT_RESIZE_INODE        0x0010
1656 #define EXT4_FEATURE_COMPAT_DIR_INDEX           0x0020
1657 #define EXT4_FEATURE_COMPAT_SPARSE_SUPER2       0x0200
1658 
1659 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER     0x0001
1660 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE       0x0002
1661 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR        0x0004
1662 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE        0x0008
1663 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM         0x0010
1664 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK        0x0020
1665 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE      0x0040
1666 #define EXT4_FEATURE_RO_COMPAT_QUOTA            0x0100
1667 #define EXT4_FEATURE_RO_COMPAT_BIGALLOC         0x0200
1668 /*
1669  * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM).  When
1670  * METADATA_CSUM is set, group descriptor checksums use the same algorithm as
1671  * all other data structures' checksums.  However, the METADATA_CSUM and
1672  * GDT_CSUM bits are mutually exclusive.
1673  */
1674 #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM    0x0400
1675 #define EXT4_FEATURE_RO_COMPAT_READONLY         0x1000
1676 #define EXT4_FEATURE_RO_COMPAT_PROJECT          0x2000
1677 
1678 #define EXT4_FEATURE_INCOMPAT_COMPRESSION       0x0001
1679 #define EXT4_FEATURE_INCOMPAT_FILETYPE          0x0002
1680 #define EXT4_FEATURE_INCOMPAT_RECOVER           0x0004 /* Needs recovery */
1681 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV       0x0008 /* Journal device */
1682 #define EXT4_FEATURE_INCOMPAT_META_BG           0x0010
1683 #define EXT4_FEATURE_INCOMPAT_EXTENTS           0x0040 /* extents support */
1684 #define EXT4_FEATURE_INCOMPAT_64BIT             0x0080
1685 #define EXT4_FEATURE_INCOMPAT_MMP               0x0100
1686 #define EXT4_FEATURE_INCOMPAT_FLEX_BG           0x0200
1687 #define EXT4_FEATURE_INCOMPAT_EA_INODE          0x0400 /* EA in inode */
1688 #define EXT4_FEATURE_INCOMPAT_DIRDATA           0x1000 /* data in dirent */
1689 #define EXT4_FEATURE_INCOMPAT_CSUM_SEED         0x2000
1690 #define EXT4_FEATURE_INCOMPAT_LARGEDIR          0x4000 /* >2GB or 3-lvl htree */
1691 #define EXT4_FEATURE_INCOMPAT_INLINE_DATA       0x8000 /* data in inode */
1692 #define EXT4_FEATURE_INCOMPAT_ENCRYPT           0x10000
1693 
1694 #define EXT4_FEATURE_COMPAT_FUNCS(name, flagname) \
1695 static inline bool ext4_has_feature_##name(struct super_block *sb) \
1696 { \
1697         return ((EXT4_SB(sb)->s_es->s_feature_compat & \
1698                 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname)) != 0); \
1699 } \
1700 static inline void ext4_set_feature_##name(struct super_block *sb) \
1701 { \
1702         EXT4_SB(sb)->s_es->s_feature_compat |= \
1703                 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \
1704 } \
1705 static inline void ext4_clear_feature_##name(struct super_block *sb) \
1706 { \
1707         EXT4_SB(sb)->s_es->s_feature_compat &= \
1708                 ~cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \
1709 }
1710 
1711 #define EXT4_FEATURE_RO_COMPAT_FUNCS(name, flagname) \
1712 static inline bool ext4_has_feature_##name(struct super_block *sb) \
1713 { \
1714         return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \
1715                 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname)) != 0); \
1716 } \
1717 static inline void ext4_set_feature_##name(struct super_block *sb) \
1718 { \
1719         EXT4_SB(sb)->s_es->s_feature_ro_compat |= \
1720                 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \
1721 } \
1722 static inline void ext4_clear_feature_##name(struct super_block *sb) \
1723 { \
1724         EXT4_SB(sb)->s_es->s_feature_ro_compat &= \
1725                 ~cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \
1726 }
1727 
1728 #define EXT4_FEATURE_INCOMPAT_FUNCS(name, flagname) \
1729 static inline bool ext4_has_feature_##name(struct super_block *sb) \
1730 { \
1731         return ((EXT4_SB(sb)->s_es->s_feature_incompat & \
1732                 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname)) != 0); \
1733 } \
1734 static inline void ext4_set_feature_##name(struct super_block *sb) \
1735 { \
1736         EXT4_SB(sb)->s_es->s_feature_incompat |= \
1737                 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \
1738 } \
1739 static inline void ext4_clear_feature_##name(struct super_block *sb) \
1740 { \
1741         EXT4_SB(sb)->s_es->s_feature_incompat &= \
1742                 ~cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \
1743 }
1744 
1745 EXT4_FEATURE_COMPAT_FUNCS(dir_prealloc,         DIR_PREALLOC)
1746 EXT4_FEATURE_COMPAT_FUNCS(imagic_inodes,        IMAGIC_INODES)
1747 EXT4_FEATURE_COMPAT_FUNCS(journal,              HAS_JOURNAL)
1748 EXT4_FEATURE_COMPAT_FUNCS(xattr,                EXT_ATTR)
1749 EXT4_FEATURE_COMPAT_FUNCS(resize_inode,         RESIZE_INODE)
1750 EXT4_FEATURE_COMPAT_FUNCS(dir_index,            DIR_INDEX)
1751 EXT4_FEATURE_COMPAT_FUNCS(sparse_super2,        SPARSE_SUPER2)
1752 
1753 EXT4_FEATURE_RO_COMPAT_FUNCS(sparse_super,      SPARSE_SUPER)
1754 EXT4_FEATURE_RO_COMPAT_FUNCS(large_file,        LARGE_FILE)
1755 EXT4_FEATURE_RO_COMPAT_FUNCS(btree_dir,         BTREE_DIR)
1756 EXT4_FEATURE_RO_COMPAT_FUNCS(huge_file,         HUGE_FILE)
1757 EXT4_FEATURE_RO_COMPAT_FUNCS(gdt_csum,          GDT_CSUM)
1758 EXT4_FEATURE_RO_COMPAT_FUNCS(dir_nlink,         DIR_NLINK)
1759 EXT4_FEATURE_RO_COMPAT_FUNCS(extra_isize,       EXTRA_ISIZE)
1760 EXT4_FEATURE_RO_COMPAT_FUNCS(quota,             QUOTA)
1761 EXT4_FEATURE_RO_COMPAT_FUNCS(bigalloc,          BIGALLOC)
1762 EXT4_FEATURE_RO_COMPAT_FUNCS(metadata_csum,     METADATA_CSUM)
1763 EXT4_FEATURE_RO_COMPAT_FUNCS(readonly,          READONLY)
1764 EXT4_FEATURE_RO_COMPAT_FUNCS(project,           PROJECT)
1765 
1766 EXT4_FEATURE_INCOMPAT_FUNCS(compression,        COMPRESSION)
1767 EXT4_FEATURE_INCOMPAT_FUNCS(filetype,           FILETYPE)
1768 EXT4_FEATURE_INCOMPAT_FUNCS(journal_needs_recovery,     RECOVER)
1769 EXT4_FEATURE_INCOMPAT_FUNCS(journal_dev,        JOURNAL_DEV)
1770 EXT4_FEATURE_INCOMPAT_FUNCS(meta_bg,            META_BG)
1771 EXT4_FEATURE_INCOMPAT_FUNCS(extents,            EXTENTS)
1772 EXT4_FEATURE_INCOMPAT_FUNCS(64bit,              64BIT)
1773 EXT4_FEATURE_INCOMPAT_FUNCS(mmp,                MMP)
1774 EXT4_FEATURE_INCOMPAT_FUNCS(flex_bg,            FLEX_BG)
1775 EXT4_FEATURE_INCOMPAT_FUNCS(ea_inode,           EA_INODE)
1776 EXT4_FEATURE_INCOMPAT_FUNCS(dirdata,            DIRDATA)
1777 EXT4_FEATURE_INCOMPAT_FUNCS(csum_seed,          CSUM_SEED)
1778 EXT4_FEATURE_INCOMPAT_FUNCS(largedir,           LARGEDIR)
1779 EXT4_FEATURE_INCOMPAT_FUNCS(inline_data,        INLINE_DATA)
1780 EXT4_FEATURE_INCOMPAT_FUNCS(encrypt,            ENCRYPT)
1781 
1782 #define EXT2_FEATURE_COMPAT_SUPP        EXT4_FEATURE_COMPAT_EXT_ATTR
1783 #define EXT2_FEATURE_INCOMPAT_SUPP      (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1784                                          EXT4_FEATURE_INCOMPAT_META_BG)
1785 #define EXT2_FEATURE_RO_COMPAT_SUPP     (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1786                                          EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1787                                          EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
1788 
1789 #define EXT3_FEATURE_COMPAT_SUPP        EXT4_FEATURE_COMPAT_EXT_ATTR
1790 #define EXT3_FEATURE_INCOMPAT_SUPP      (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1791                                          EXT4_FEATURE_INCOMPAT_RECOVER| \
1792                                          EXT4_FEATURE_INCOMPAT_META_BG)
1793 #define EXT3_FEATURE_RO_COMPAT_SUPP     (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1794                                          EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1795                                          EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
1796 
1797 #define EXT4_FEATURE_COMPAT_SUPP        EXT4_FEATURE_COMPAT_EXT_ATTR
1798 #define EXT4_FEATURE_INCOMPAT_SUPP      (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1799                                          EXT4_FEATURE_INCOMPAT_RECOVER| \
1800                                          EXT4_FEATURE_INCOMPAT_META_BG| \
1801                                          EXT4_FEATURE_INCOMPAT_EXTENTS| \
1802                                          EXT4_FEATURE_INCOMPAT_64BIT| \
1803                                          EXT4_FEATURE_INCOMPAT_FLEX_BG| \
1804                                          EXT4_FEATURE_INCOMPAT_MMP | \
1805                                          EXT4_FEATURE_INCOMPAT_INLINE_DATA | \
1806                                          EXT4_FEATURE_INCOMPAT_ENCRYPT | \
1807                                          EXT4_FEATURE_INCOMPAT_CSUM_SEED)
1808 #define EXT4_FEATURE_RO_COMPAT_SUPP     (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1809                                          EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1810                                          EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
1811                                          EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
1812                                          EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
1813                                          EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
1814                                          EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\
1815                                          EXT4_FEATURE_RO_COMPAT_BIGALLOC |\
1816                                          EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\
1817                                          EXT4_FEATURE_RO_COMPAT_QUOTA |\
1818                                          EXT4_FEATURE_RO_COMPAT_PROJECT)
1819 
1820 #define EXTN_FEATURE_FUNCS(ver) \
1821 static inline bool ext4_has_unknown_ext##ver##_compat_features(struct super_block *sb) \
1822 { \
1823         return ((EXT4_SB(sb)->s_es->s_feature_compat & \
1824                 cpu_to_le32(~EXT##ver##_FEATURE_COMPAT_SUPP)) != 0); \
1825 } \
1826 static inline bool ext4_has_unknown_ext##ver##_ro_compat_features(struct super_block *sb) \
1827 { \
1828         return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \
1829                 cpu_to_le32(~EXT##ver##_FEATURE_RO_COMPAT_SUPP)) != 0); \
1830 } \
1831 static inline bool ext4_has_unknown_ext##ver##_incompat_features(struct super_block *sb) \
1832 { \
1833         return ((EXT4_SB(sb)->s_es->s_feature_incompat & \
1834                 cpu_to_le32(~EXT##ver##_FEATURE_INCOMPAT_SUPP)) != 0); \
1835 }
1836 
1837 EXTN_FEATURE_FUNCS(2)
1838 EXTN_FEATURE_FUNCS(3)
1839 EXTN_FEATURE_FUNCS(4)
1840 
1841 static inline bool ext4_has_compat_features(struct super_block *sb)
1842 {
1843         return (EXT4_SB(sb)->s_es->s_feature_compat != 0);
1844 }
1845 static inline bool ext4_has_ro_compat_features(struct super_block *sb)
1846 {
1847         return (EXT4_SB(sb)->s_es->s_feature_ro_compat != 0);
1848 }
1849 static inline bool ext4_has_incompat_features(struct super_block *sb)
1850 {
1851         return (EXT4_SB(sb)->s_es->s_feature_incompat != 0);
1852 }
1853 
1854 /*
1855  * Default values for user and/or group using reserved blocks
1856  */
1857 #define EXT4_DEF_RESUID         0
1858 #define EXT4_DEF_RESGID         0
1859 
1860 /*
1861  * Default project ID
1862  */
1863 #define EXT4_DEF_PROJID         0
1864 
1865 #define EXT4_DEF_INODE_READAHEAD_BLKS   32
1866 
1867 /*
1868  * Default mount options
1869  */
1870 #define EXT4_DEFM_DEBUG         0x0001
1871 #define EXT4_DEFM_BSDGROUPS     0x0002
1872 #define EXT4_DEFM_XATTR_USER    0x0004
1873 #define EXT4_DEFM_ACL           0x0008
1874 #define EXT4_DEFM_UID16         0x0010
1875 #define EXT4_DEFM_JMODE         0x0060
1876 #define EXT4_DEFM_JMODE_DATA    0x0020
1877 #define EXT4_DEFM_JMODE_ORDERED 0x0040
1878 #define EXT4_DEFM_JMODE_WBACK   0x0060
1879 #define EXT4_DEFM_NOBARRIER     0x0100
1880 #define EXT4_DEFM_BLOCK_VALIDITY 0x0200
1881 #define EXT4_DEFM_DISCARD       0x0400
1882 #define EXT4_DEFM_NODELALLOC    0x0800
1883 
1884 /*
1885  * Default journal batch times
1886  */
1887 #define EXT4_DEF_MIN_BATCH_TIME 0
1888 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */
1889 
1890 /*
1891  * Minimum number of groups in a flexgroup before we separate out
1892  * directories into the first block group of a flexgroup
1893  */
1894 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4
1895 
1896 /*
1897  * Structure of a directory entry
1898  */
1899 #define EXT4_NAME_LEN 255
1900 
1901 struct ext4_dir_entry {
1902         __le32  inode;                  /* Inode number */
1903         __le16  rec_len;                /* Directory entry length */
1904         __le16  name_len;               /* Name length */
1905         char    name[EXT4_NAME_LEN];    /* File name */
1906 };
1907 
1908 /*
1909  * The new version of the directory entry.  Since EXT4 structures are
1910  * stored in intel byte order, and the name_len field could never be
1911  * bigger than 255 chars, it's safe to reclaim the extra byte for the
1912  * file_type field.
1913  */
1914 struct ext4_dir_entry_2 {
1915         __le32  inode;                  /* Inode number */
1916         __le16  rec_len;                /* Directory entry length */
1917         __u8    name_len;               /* Name length */
1918         __u8    file_type;
1919         char    name[EXT4_NAME_LEN];    /* File name */
1920 };
1921 
1922 /*
1923  * This is a bogus directory entry at the end of each leaf block that
1924  * records checksums.
1925  */
1926 struct ext4_dir_entry_tail {
1927         __le32  det_reserved_zero1;     /* Pretend to be unused */
1928         __le16  det_rec_len;            /* 12 */
1929         __u8    det_reserved_zero2;     /* Zero name length */
1930         __u8    det_reserved_ft;        /* 0xDE, fake file type */
1931         __le32  det_checksum;           /* crc32c(uuid+inum+dirblock) */
1932 };
1933 
1934 #define EXT4_DIRENT_TAIL(block, blocksize) \
1935         ((struct ext4_dir_entry_tail *)(((void *)(block)) + \
1936                                         ((blocksize) - \
1937                                          sizeof(struct ext4_dir_entry_tail))))
1938 
1939 /*
1940  * Ext4 directory file types.  Only the low 3 bits are used.  The
1941  * other bits are reserved for now.
1942  */
1943 #define EXT4_FT_UNKNOWN         0
1944 #define EXT4_FT_REG_FILE        1
1945 #define EXT4_FT_DIR             2
1946 #define EXT4_FT_CHRDEV          3
1947 #define EXT4_FT_BLKDEV          4
1948 #define EXT4_FT_FIFO            5
1949 #define EXT4_FT_SOCK            6
1950 #define EXT4_FT_SYMLINK         7
1951 
1952 #define EXT4_FT_MAX             8
1953 
1954 #define EXT4_FT_DIR_CSUM        0xDE
1955 
1956 /*
1957  * EXT4_DIR_PAD defines the directory entries boundaries
1958  *
1959  * NOTE: It must be a multiple of 4
1960  */
1961 #define EXT4_DIR_PAD                    4
1962 #define EXT4_DIR_ROUND                  (EXT4_DIR_PAD - 1)
1963 #define EXT4_DIR_REC_LEN(name_len)      (((name_len) + 8 + EXT4_DIR_ROUND) & \
1964                                          ~EXT4_DIR_ROUND)
1965 #define EXT4_MAX_REC_LEN                ((1<<16)-1)
1966 
1967 /*
1968  * If we ever get support for fs block sizes > page_size, we'll need
1969  * to remove the #if statements in the next two functions...
1970  */
1971 static inline unsigned int
1972 ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize)
1973 {
1974         unsigned len = le16_to_cpu(dlen);
1975 
1976 #if (PAGE_CACHE_SIZE >= 65536)
1977         if (len == EXT4_MAX_REC_LEN || len == 0)
1978                 return blocksize;
1979         return (len & 65532) | ((len & 3) << 16);
1980 #else
1981         return len;
1982 #endif
1983 }
1984 
1985 static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize)
1986 {
1987         if ((len > blocksize) || (blocksize > (1 << 18)) || (len & 3))
1988                 BUG();
1989 #if (PAGE_CACHE_SIZE >= 65536)
1990         if (len < 65536)
1991                 return cpu_to_le16(len);
1992         if (len == blocksize) {
1993                 if (blocksize == 65536)
1994                         return cpu_to_le16(EXT4_MAX_REC_LEN);
1995                 else
1996                         return cpu_to_le16(0);
1997         }
1998         return cpu_to_le16((len & 65532) | ((len >> 16) & 3));
1999 #else
2000         return cpu_to_le16(len);
2001 #endif
2002 }
2003 
2004 /*
2005  * Hash Tree Directory indexing
2006  * (c) Daniel Phillips, 2001
2007  */
2008 
2009 #define is_dx(dir) (ext4_has_feature_dir_index((dir)->i_sb) && \
2010                     ext4_test_inode_flag((dir), EXT4_INODE_INDEX))
2011 #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX)
2012 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
2013 
2014 /* Legal values for the dx_root hash_version field: */
2015 
2016 #define DX_HASH_LEGACY          0
2017 #define DX_HASH_HALF_MD4        1
2018 #define DX_HASH_TEA             2
2019 #define DX_HASH_LEGACY_UNSIGNED 3
2020 #define DX_HASH_HALF_MD4_UNSIGNED       4
2021 #define DX_HASH_TEA_UNSIGNED            5
2022 
2023 static inline u32 ext4_chksum(struct ext4_sb_info *sbi, u32 crc,
2024                               const void *address, unsigned int length)
2025 {
2026         struct {
2027                 struct shash_desc shash;
2028                 char ctx[4];
2029         } desc;
2030         int err;
2031 
2032         BUG_ON(crypto_shash_descsize(sbi->s_chksum_driver)!=sizeof(desc.ctx));
2033 
2034         desc.shash.tfm = sbi->s_chksum_driver;
2035         desc.shash.flags = 0;
2036         *(u32 *)desc.ctx = crc;
2037 
2038         err = crypto_shash_update(&desc.shash, address, length);
2039         BUG_ON(err);
2040 
2041         return *(u32 *)desc.ctx;
2042 }
2043 
2044 #ifdef __KERNEL__
2045 
2046 /* hash info structure used by the directory hash */
2047 struct dx_hash_info
2048 {
2049         u32             hash;
2050         u32             minor_hash;
2051         int             hash_version;
2052         u32             *seed;
2053 };
2054 
2055 
2056 /* 32 and 64 bit signed EOF for dx directories */
2057 #define EXT4_HTREE_EOF_32BIT   ((1UL  << (32 - 1)) - 1)
2058 #define EXT4_HTREE_EOF_64BIT   ((1ULL << (64 - 1)) - 1)
2059 
2060 
2061 /*
2062  * Control parameters used by ext4_htree_next_block
2063  */
2064 #define HASH_NB_ALWAYS          1
2065 
2066 struct ext4_filename {
2067         const struct qstr *usr_fname;
2068         struct ext4_str disk_name;
2069         struct dx_hash_info hinfo;
2070 #ifdef CONFIG_EXT4_FS_ENCRYPTION
2071         struct ext4_str crypto_buf;
2072 #endif
2073 };
2074 
2075 #define fname_name(p) ((p)->disk_name.name)
2076 #define fname_len(p)  ((p)->disk_name.len)
2077 
2078 /*
2079  * Describe an inode's exact location on disk and in memory
2080  */
2081 struct ext4_iloc
2082 {
2083         struct buffer_head *bh;
2084         unsigned long offset;
2085         ext4_group_t block_group;
2086 };
2087 
2088 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
2089 {
2090         return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
2091 }
2092 
2093 /*
2094  * This structure is stuffed into the struct file's private_data field
2095  * for directories.  It is where we put information so that we can do
2096  * readdir operations in hash tree order.
2097  */
2098 struct dir_private_info {
2099         struct rb_root  root;
2100         struct rb_node  *curr_node;
2101         struct fname    *extra_fname;
2102         loff_t          last_pos;
2103         __u32           curr_hash;
2104         __u32           curr_minor_hash;
2105         __u32           next_hash;
2106 };
2107 
2108 /* calculate the first block number of the group */
2109 static inline ext4_fsblk_t
2110 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no)
2111 {
2112         return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
2113                 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
2114 }
2115 
2116 /*
2117  * Special error return code only used by dx_probe() and its callers.
2118  */
2119 #define ERR_BAD_DX_DIR  (-(MAX_ERRNO - 1))
2120 
2121 /*
2122  * Timeout and state flag for lazy initialization inode thread.
2123  */
2124 #define EXT4_DEF_LI_WAIT_MULT                   10
2125 #define EXT4_DEF_LI_MAX_START_DELAY             5
2126 #define EXT4_LAZYINIT_QUIT                      0x0001
2127 #define EXT4_LAZYINIT_RUNNING                   0x0002
2128 
2129 /*
2130  * Lazy inode table initialization info
2131  */
2132 struct ext4_lazy_init {
2133         unsigned long           li_state;
2134         struct list_head        li_request_list;
2135         struct mutex            li_list_mtx;
2136 };
2137 
2138 struct ext4_li_request {
2139         struct super_block      *lr_super;
2140         struct ext4_sb_info     *lr_sbi;
2141         ext4_group_t            lr_next_group;
2142         struct list_head        lr_request;
2143         unsigned long           lr_next_sched;
2144         unsigned long           lr_timeout;
2145 };
2146 
2147 struct ext4_features {
2148         struct kobject f_kobj;
2149         struct completion f_kobj_unregister;
2150 };
2151 
2152 /*
2153  * This structure will be used for multiple mount protection. It will be
2154  * written into the block number saved in the s_mmp_block field in the
2155  * superblock. Programs that check MMP should assume that if
2156  * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe
2157  * to use the filesystem, regardless of how old the timestamp is.
2158  */
2159 #define EXT4_MMP_MAGIC     0x004D4D50U /* ASCII for MMP */
2160 #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */
2161 #define EXT4_MMP_SEQ_FSCK  0xE24D4D50U /* mmp_seq value when being fscked */
2162 #define EXT4_MMP_SEQ_MAX   0xE24D4D4FU /* maximum valid mmp_seq value */
2163 
2164 struct mmp_struct {
2165         __le32  mmp_magic;              /* Magic number for MMP */
2166         __le32  mmp_seq;                /* Sequence no. updated periodically */
2167 
2168         /*
2169          * mmp_time, mmp_nodename & mmp_bdevname are only used for information
2170          * purposes and do not affect the correctness of the algorithm
2171          */
2172         __le64  mmp_time;               /* Time last updated */
2173         char    mmp_nodename[64];       /* Node which last updated MMP block */
2174         char    mmp_bdevname[32];       /* Bdev which last updated MMP block */
2175 
2176         /*
2177          * mmp_check_interval is used to verify if the MMP block has been
2178          * updated on the block device. The value is updated based on the
2179          * maximum time to write the MMP block during an update cycle.
2180          */
2181         __le16  mmp_check_interval;
2182 
2183         __le16  mmp_pad1;
2184         __le32  mmp_pad2[226];
2185         __le32  mmp_checksum;           /* crc32c(uuid+mmp_block) */
2186 };
2187 
2188 /* arguments passed to the mmp thread */
2189 struct mmpd_data {
2190         struct buffer_head *bh; /* bh from initial read_mmp_block() */
2191         struct super_block *sb;  /* super block of the fs */
2192 };
2193 
2194 /*
2195  * Check interval multiplier
2196  * The MMP block is written every update interval and initially checked every
2197  * update interval x the multiplier (the value is then adapted based on the
2198  * write latency). The reason is that writes can be delayed under load and we
2199  * don't want readers to incorrectly assume that the filesystem is no longer
2200  * in use.
2201  */
2202 #define EXT4_MMP_CHECK_MULT             2UL
2203 
2204 /*
2205  * Minimum interval for MMP checking in seconds.
2206  */
2207 #define EXT4_MMP_MIN_CHECK_INTERVAL     5UL
2208 
2209 /*
2210  * Maximum interval for MMP checking in seconds.
2211  */
2212 #define EXT4_MMP_MAX_CHECK_INTERVAL     300UL
2213 
2214 /*
2215  * Function prototypes
2216  */
2217 
2218 /*
2219  * Ok, these declarations are also in <linux/kernel.h> but none of the
2220  * ext4 source programs needs to include it so they are duplicated here.
2221  */
2222 # define NORET_TYPE     /**/
2223 # define ATTRIB_NORET   __attribute__((noreturn))
2224 # define NORET_AND      noreturn,
2225 
2226 /* bitmap.c */
2227 extern unsigned int ext4_count_free(char *bitmap, unsigned numchars);
2228 void ext4_inode_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
2229                                 struct ext4_group_desc *gdp,
2230                                 struct buffer_head *bh, int sz);
2231 int ext4_inode_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
2232                                   struct ext4_group_desc *gdp,
2233                                   struct buffer_head *bh, int sz);
2234 void ext4_block_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
2235                                 struct ext4_group_desc *gdp,
2236                                 struct buffer_head *bh);
2237 int ext4_block_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
2238                                   struct ext4_group_desc *gdp,
2239                                   struct buffer_head *bh);
2240 
2241 /* balloc.c */
2242 extern void ext4_get_group_no_and_offset(struct super_block *sb,
2243                                          ext4_fsblk_t blocknr,
2244                                          ext4_group_t *blockgrpp,
2245                                          ext4_grpblk_t *offsetp);
2246 extern ext4_group_t ext4_get_group_number(struct super_block *sb,
2247                                           ext4_fsblk_t block);
2248 
2249 extern unsigned int ext4_block_group(struct super_block *sb,
2250                         ext4_fsblk_t blocknr);
2251 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb,
2252                         ext4_fsblk_t blocknr);
2253 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group);
2254 extern unsigned long ext4_bg_num_gdb(struct super_block *sb,
2255                         ext4_group_t group);
2256 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,
2257                                          ext4_fsblk_t goal,
2258                                          unsigned int flags,
2259                                          unsigned long *count,
2260                                          int *errp);
2261 extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi,
2262                                     s64 nclusters, unsigned int flags);
2263 extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *);
2264 extern void ext4_check_blocks_bitmap(struct super_block *);
2265 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
2266                                                     ext4_group_t block_group,
2267                                                     struct buffer_head ** bh);
2268 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
2269 
2270 extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb,
2271                                                 ext4_group_t block_group);
2272 extern int ext4_wait_block_bitmap(struct super_block *sb,
2273                                   ext4_group_t block_group,
2274                                   struct buffer_head *bh);
2275 extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb,
2276                                                   ext4_group_t block_group);
2277 extern unsigned ext4_free_clusters_after_init(struct super_block *sb,
2278                                               ext4_group_t block_group,
2279                                               struct ext4_group_desc *gdp);
2280 ext4_fsblk_t ext4_inode_to_goal_block(struct inode *);
2281 
2282 /* crypto_policy.c */
2283 int ext4_is_child_context_consistent_with_parent(struct inode *parent,
2284                                                  struct inode *child);
2285 int ext4_inherit_context(struct inode *parent, struct inode *child);
2286 void ext4_to_hex(char *dst, char *src, size_t src_size);
2287 int ext4_process_policy(const struct ext4_encryption_policy *policy,
2288                         struct inode *inode);
2289 int ext4_get_policy(struct inode *inode,
2290                     struct ext4_encryption_policy *policy);
2291 
2292 /* crypto.c */
2293 extern struct kmem_cache *ext4_crypt_info_cachep;
2294 bool ext4_valid_contents_enc_mode(uint32_t mode);
2295 uint32_t ext4_validate_encryption_key_size(uint32_t mode, uint32_t size);
2296 extern struct workqueue_struct *ext4_read_workqueue;
2297 struct ext4_crypto_ctx *ext4_get_crypto_ctx(struct inode *inode);
2298 void ext4_release_crypto_ctx(struct ext4_crypto_ctx *ctx);
2299 void ext4_restore_control_page(struct page *data_page);
2300 struct page *ext4_encrypt(struct inode *inode,
2301                           struct page *plaintext_page);
2302 int ext4_decrypt(struct page *page);
2303 int ext4_encrypted_zeroout(struct inode *inode, ext4_lblk_t lblk,
2304                            ext4_fsblk_t pblk, ext4_lblk_t len);
2305 extern const struct dentry_operations ext4_encrypted_d_ops;
2306 
2307 #ifdef CONFIG_EXT4_FS_ENCRYPTION
2308 int ext4_init_crypto(void);
2309 void ext4_exit_crypto(void);
2310 static inline int ext4_sb_has_crypto(struct super_block *sb)
2311 {
2312         return ext4_has_feature_encrypt(sb);
2313 }
2314 #else
2315 static inline int ext4_init_crypto(void) { return 0; }
2316 static inline void ext4_exit_crypto(void) { }
2317 static inline int ext4_sb_has_crypto(struct super_block *sb)
2318 {
2319         return 0;
2320 }
2321 #endif
2322 
2323 /* crypto_fname.c */
2324 bool ext4_valid_filenames_enc_mode(uint32_t mode);
2325 u32 ext4_fname_crypto_round_up(u32 size, u32 blksize);
2326 unsigned ext4_fname_encrypted_size(struct inode *inode, u32 ilen);
2327 int ext4_fname_crypto_alloc_buffer(struct inode *inode,
2328                                    u32 ilen, struct ext4_str *crypto_str);
2329 int _ext4_fname_disk_to_usr(struct inode *inode,
2330                             struct dx_hash_info *hinfo,
2331                             const struct ext4_str *iname,
2332                             struct ext4_str *oname);
2333 int ext4_fname_disk_to_usr(struct inode *inode,
2334                            struct dx_hash_info *hinfo,
2335                            const struct ext4_dir_entry_2 *de,
2336                            struct ext4_str *oname);
2337 int ext4_fname_usr_to_disk(struct inode *inode,
2338                            const struct qstr *iname,
2339                            struct ext4_str *oname);
2340 #ifdef CONFIG_EXT4_FS_ENCRYPTION
2341 void ext4_fname_crypto_free_buffer(struct ext4_str *crypto_str);
2342 int ext4_fname_setup_filename(struct inode *dir, const struct qstr *iname,
2343                               int lookup, struct ext4_filename *fname);
2344 void ext4_fname_free_filename(struct ext4_filename *fname);
2345 #else
2346 static inline
2347 int ext4_setup_fname_crypto(struct inode *inode)
2348 {
2349         return 0;
2350 }
2351 static inline void ext4_fname_crypto_free_buffer(struct ext4_str *p) { }
2352 static inline int ext4_fname_setup_filename(struct inode *dir,
2353                                      const struct qstr *iname,
2354                                      int lookup, struct ext4_filename *fname)
2355 {
2356         fname->usr_fname = iname;
2357         fname->disk_name.name = (unsigned char *) iname->name;
2358         fname->disk_name.len = iname->len;
2359         return 0;
2360 }
2361 static inline void ext4_fname_free_filename(struct ext4_filename *fname) { }
2362 #endif
2363 
2364 
2365 /* crypto_key.c */
2366 void ext4_free_crypt_info(struct ext4_crypt_info *ci);
2367 void ext4_free_encryption_info(struct inode *inode, struct ext4_crypt_info *ci);
2368 int _ext4_get_encryption_info(struct inode *inode);
2369 
2370 #ifdef CONFIG_EXT4_FS_ENCRYPTION
2371 int ext4_has_encryption_key(struct inode *inode);
2372 
2373 static inline int ext4_get_encryption_info(struct inode *inode)
2374 {
2375         struct ext4_crypt_info *ci = EXT4_I(inode)->i_crypt_info;
2376 
2377         if (!ci ||
2378             (ci->ci_keyring_key &&
2379              (ci->ci_keyring_key->flags & ((1 << KEY_FLAG_INVALIDATED) |
2380                                            (1 << KEY_FLAG_REVOKED) |
2381                                            (1 << KEY_FLAG_DEAD)))))
2382                 return _ext4_get_encryption_info(inode);
2383         return 0;
2384 }
2385 
2386 static inline struct ext4_crypt_info *ext4_encryption_info(struct inode *inode)
2387 {
2388         return EXT4_I(inode)->i_crypt_info;
2389 }
2390 
2391 #else
2392 static inline int ext4_has_encryption_key(struct inode *inode)
2393 {
2394         return 0;
2395 }
2396 static inline int ext4_get_encryption_info(struct inode *inode)
2397 {
2398         return 0;
2399 }
2400 static inline struct ext4_crypt_info *ext4_encryption_info(struct inode *inode)
2401 {
2402         return NULL;
2403 }
2404 #endif
2405 
2406 
2407 /* dir.c */
2408 extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *,
2409                                   struct file *,
2410                                   struct ext4_dir_entry_2 *,
2411                                   struct buffer_head *, char *, int,
2412                                   unsigned int);
2413 #define ext4_check_dir_entry(dir, filp, de, bh, buf, size, offset)      \
2414         unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \
2415                                         (de), (bh), (buf), (size), (offset)))
2416 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
2417                                 __u32 minor_hash,
2418                                 struct ext4_dir_entry_2 *dirent,
2419                                 struct ext4_str *ent_name);
2420 extern void ext4_htree_free_dir_info(struct dir_private_info *p);
2421 extern int ext4_find_dest_de(struct inode *dir, struct inode *inode,
2422                              struct buffer_head *bh,
2423                              void *buf, int buf_size,
2424                              struct ext4_filename *fname,
2425                              struct ext4_dir_entry_2 **dest_de);
2426 int ext4_insert_dentry(struct inode *dir,
2427                        struct inode *inode,
2428                        struct ext4_dir_entry_2 *de,
2429                        int buf_size,
2430                        struct ext4_filename *fname);
2431 static inline void ext4_update_dx_flag(struct inode *inode)
2432 {
2433         if (!ext4_has_feature_dir_index(inode->i_sb))
2434                 ext4_clear_inode_flag(inode, EXT4_INODE_INDEX);
2435 }
2436 static unsigned char ext4_filetype_table[] = {
2437         DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK
2438 };
2439 
2440 static inline  unsigned char get_dtype(struct super_block *sb, int filetype)
2441 {
2442         if (!ext4_has_feature_filetype(sb) || filetype >= EXT4_FT_MAX)
2443                 return DT_UNKNOWN;
2444 
2445         return ext4_filetype_table[filetype];
2446 }
2447 extern int ext4_check_all_de(struct inode *dir, struct buffer_head *bh,
2448                              void *buf, int buf_size);
2449 
2450 /* fsync.c */
2451 extern int ext4_sync_file(struct file *, loff_t, loff_t, int);
2452 
2453 /* hash.c */
2454 extern int ext4fs_dirhash(const char *name, int len, struct
2455                           dx_hash_info *hinfo);
2456 
2457 /* ialloc.c */
2458 extern struct inode *__ext4_new_inode(handle_t *, struct inode *, umode_t,
2459                                       const struct qstr *qstr, __u32 goal,
2460                                       uid_t *owner, int handle_type,
2461                                       unsigned int line_no, int nblocks);
2462 
2463 #define ext4_new_inode(handle, dir, mode, qstr, goal, owner) \
2464         __ext4_new_inode((handle), (dir), (mode), (qstr), (goal), (owner), \
2465                          0, 0, 0)
2466 #define ext4_new_inode_start_handle(dir, mode, qstr, goal, owner, \
2467                                     type, nblocks)                  \
2468         __ext4_new_inode(NULL, (dir), (mode), (qstr), (goal), (owner), \
2469                          (type), __LINE__, (nblocks))
2470 
2471 
2472 extern void ext4_free_inode(handle_t *, struct inode *);
2473 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long);
2474 extern unsigned long ext4_count_free_inodes(struct super_block *);
2475 extern unsigned long ext4_count_dirs(struct super_block *);
2476 extern void ext4_check_inodes_bitmap(struct super_block *);
2477 extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap);
2478 extern int ext4_init_inode_table(struct super_block *sb,
2479                                  ext4_group_t group, int barrier);
2480 extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate);
2481 
2482 /* mballoc.c */
2483 extern const struct file_operations ext4_seq_mb_groups_fops;
2484 extern long ext4_mb_stats;
2485 extern long ext4_mb_max_to_scan;
2486 extern int ext4_mb_init(struct super_block *);
2487 extern int ext4_mb_release(struct super_block *);
2488 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *,
2489                                 struct ext4_allocation_request *, int *);
2490 extern int ext4_mb_reserve_blocks(struct super_block *, int);
2491 extern void ext4_discard_preallocations(struct inode *);
2492 extern int __init ext4_init_mballoc(void);
2493 extern void ext4_exit_mballoc(void);
2494 extern void ext4_free_blocks(handle_t *handle, struct inode *inode,
2495                              struct buffer_head *bh, ext4_fsblk_t block,
2496                              unsigned long count, int flags);
2497 extern int ext4_mb_alloc_groupinfo(struct super_block *sb,
2498                                    ext4_group_t ngroups);
2499 extern int ext4_mb_add_groupinfo(struct super_block *sb,
2500                 ext4_group_t i, struct ext4_group_desc *desc);
2501 extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb,
2502                                 ext4_fsblk_t block, unsigned long count);
2503 extern int ext4_trim_fs(struct super_block *, struct fstrim_range *);
2504 
2505 /* inode.c */
2506 int ext4_inode_is_fast_symlink(struct inode *inode);
2507 struct buffer_head *ext4_getblk(handle_t *, struct inode *, ext4_lblk_t, int);
2508 struct buffer_head *ext4_bread(handle_t *, struct inode *, ext4_lblk_t, int);
2509 int ext4_get_block_write(struct inode *inode, sector_t iblock,
2510                          struct buffer_head *bh_result, int create);
2511 int ext4_dax_mmap_get_block(struct inode *inode, sector_t iblock,
2512                             struct buffer_head *bh_result, int create);
2513 int ext4_get_block(struct inode *inode, sector_t iblock,
2514                                 struct buffer_head *bh_result, int create);
2515 int ext4_da_get_block_prep(struct inode *inode, sector_t iblock,
2516                            struct buffer_head *bh, int create);
2517 int ext4_walk_page_buffers(handle_t *handle,
2518                            struct buffer_head *head,
2519                            unsigned from,
2520                            unsigned to,
2521                            int *partial,
2522                            int (*fn)(handle_t *handle,
2523                                      struct buffer_head *bh));
2524 int do_journal_get_write_access(handle_t *handle,
2525                                 struct buffer_head *bh);
2526 #define FALL_BACK_TO_NONDELALLOC 1
2527 #define CONVERT_INLINE_DATA      2
2528 
2529 extern struct inode *ext4_iget(struct super_block *, unsigned long);
2530 extern struct inode *ext4_iget_normal(struct super_block *, unsigned long);
2531 extern int  ext4_write_inode(struct inode *, struct writeback_control *);
2532 extern int  ext4_setattr(struct dentry *, struct iattr *);
2533 extern int  ext4_getattr(struct vfsmount *mnt, struct dentry *dentry,
2534                                 struct kstat *stat);
2535 extern void ext4_evict_inode(struct inode *);
2536 extern void ext4_clear_inode(struct inode *);
2537 extern int  ext4_sync_inode(handle_t *, struct inode *);
2538 extern void ext4_dirty_inode(struct inode *, int);
2539 extern int ext4_change_inode_journal_flag(struct inode *, int);
2540 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
2541 extern int ext4_inode_attach_jinode(struct inode *inode);
2542 extern int ext4_can_truncate(struct inode *inode);
2543 extern void ext4_truncate(struct inode *);
2544 extern int ext4_punch_hole(struct inode *inode, loff_t offset, loff_t length);
2545 extern int ext4_truncate_restart_trans(handle_t *, struct inode *, int nblocks);
2546 extern void ext4_set_inode_flags(struct inode *);
2547 extern void ext4_get_inode_flags(struct ext4_inode_info *);
2548 extern int ext4_alloc_da_blocks(struct inode *inode);
2549 extern void ext4_set_aops(struct inode *inode);
2550 extern int ext4_writepage_trans_blocks(struct inode *);
2551 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks);
2552 extern int ext4_zero_partial_blocks(handle_t *handle, struct inode *inode,
2553                              loff_t lstart, loff_t lend);
2554 extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf);
2555 extern int ext4_filemap_fault(struct vm_area_struct *vma, struct vm_fault *vmf);
2556 extern qsize_t *ext4_get_reserved_space(struct inode *inode);
2557 extern int ext4_get_projid(struct inode *inode, kprojid_t *projid);
2558 extern void ext4_da_update_reserve_space(struct inode *inode,
2559                                         int used, int quota_claim);
2560 extern int ext4_issue_zeroout(struct inode *inode, ext4_lblk_t lblk,
2561                               ext4_fsblk_t pblk, ext4_lblk_t len);
2562 
2563 /* indirect.c */
2564 extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode,
2565                                 struct ext4_map_blocks *map, int flags);
2566 extern ssize_t ext4_ind_direct_IO(struct kiocb *iocb, struct iov_iter *iter,
2567                                   loff_t offset);
2568 extern int ext4_ind_calc_metadata_amount(struct inode *inode, sector_t lblock);
2569 extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks);
2570 extern void ext4_ind_truncate(handle_t *, struct inode *inode);
2571 extern int ext4_ind_remove_space(handle_t *handle, struct inode *inode,
2572                                  ext4_lblk_t start, ext4_lblk_t end);
2573 
2574 /* ioctl.c */
2575 extern long ext4_ioctl(struct file *, unsigned int, unsigned long);
2576 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long);
2577 
2578 /* migrate.c */
2579 extern int ext4_ext_migrate(struct inode *);
2580 extern int ext4_ind_migrate(struct inode *inode);
2581 
2582 /* namei.c */
2583 extern int ext4_dirent_csum_verify(struct inode *inode,
2584                                    struct ext4_dir_entry *dirent);
2585 extern int ext4_orphan_add(handle_t *, struct inode *);
2586 extern int ext4_orphan_del(handle_t *, struct inode *);
2587 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
2588                                 __u32 start_minor_hash, __u32 *next_hash);
2589 extern int ext4_search_dir(struct buffer_head *bh,
2590                            char *search_buf,
2591                            int buf_size,
2592                            struct inode *dir,
2593                            struct ext4_filename *fname,
2594                            const struct qstr *d_name,
2595                            unsigned int offset,
2596                            struct ext4_dir_entry_2 **res_dir);
2597 extern int ext4_generic_delete_entry(handle_t *handle,
2598                                      struct inode *dir,
2599                                      struct ext4_dir_entry_2 *de_del,
2600                                      struct buffer_head *bh,
2601                                      void *entry_buf,
2602                                      int buf_size,
2603                                      int csum_size);
2604 extern int ext4_empty_dir(struct inode *inode);
2605 
2606 /* resize.c */
2607 extern int ext4_group_add(struct super_block *sb,
2608                                 struct ext4_new_group_data *input);
2609 extern int ext4_group_extend(struct super_block *sb,
2610                                 struct ext4_super_block *es,
2611                                 ext4_fsblk_t n_blocks_count);
2612 extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count);
2613 
2614 /* super.c */
2615 extern int ext4_seq_options_show(struct seq_file *seq, void *offset);
2616 extern int ext4_calculate_overhead(struct super_block *sb);
2617 extern void ext4_superblock_csum_set(struct super_block *sb);
2618 extern void *ext4_kvmalloc(size_t size, gfp_t flags);
2619 extern void *ext4_kvzalloc(size_t size, gfp_t flags);
2620 extern int ext4_alloc_flex_bg_array(struct super_block *sb,
2621                                     ext4_group_t ngroup);
2622 extern const char *ext4_decode_error(struct super_block *sb, int errno,
2623                                      char nbuf[16]);
2624 
2625 extern __printf(4, 5)
2626 void __ext4_error(struct super_block *, const char *, unsigned int,
2627                   const char *, ...);
2628 extern __printf(5, 6)
2629 void __ext4_error_inode(struct inode *, const char *, unsigned int, ext4_fsblk_t,
2630                       const char *, ...);
2631 extern __printf(5, 6)
2632 void __ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t,
2633                      const char *, ...);
2634 extern void __ext4_std_error(struct super_block *, const char *,
2635                              unsigned int, int);
2636 extern __printf(4, 5)
2637 void __ext4_abort(struct super_block *, const char *, unsigned int,
2638                   const char *, ...);
2639 extern __printf(4, 5)
2640 void __ext4_warning(struct super_block *, const char *, unsigned int,
2641                     const char *, ...);
2642 extern __printf(4, 5)
2643 void __ext4_warning_inode(const struct inode *inode, const char *function,
2644                           unsigned int line, const char *fmt, ...);
2645 extern __printf(3, 4)
2646 void __ext4_msg(struct super_block *, const char *, const char *, ...);
2647 extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp,
2648                            const char *, unsigned int, const char *);
2649 extern __printf(7, 8)
2650 void __ext4_grp_locked_error(const char *, unsigned int,
2651                              struct super_block *, ext4_group_t,
2652                              unsigned long, ext4_fsblk_t,
2653                              const char *, ...);
2654 
2655 #define EXT4_ERROR_INODE(inode, fmt, a...) \
2656         ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a)
2657 
2658 #define EXT4_ERROR_INODE_BLOCK(inode, block, fmt, a...)                 \
2659         ext4_error_inode((inode), __func__, __LINE__, (block), (fmt), ## a)
2660 
2661 #define EXT4_ERROR_FILE(file, block, fmt, a...)                         \
2662         ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a)
2663 
2664 #ifdef CONFIG_PRINTK
2665 
2666 #define ext4_error_inode(inode, func, line, block, fmt, ...)            \
2667         __ext4_error_inode(inode, func, line, block, fmt, ##__VA_ARGS__)
2668 #define ext4_error_file(file, func, line, block, fmt, ...)              \
2669         __ext4_error_file(file, func, line, block, fmt, ##__VA_ARGS__)
2670 #define ext4_error(sb, fmt, ...)                                        \
2671         __ext4_error(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
2672 #define ext4_abort(sb, fmt, ...)                                        \
2673         __ext4_abort(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
2674 #define ext4_warning(sb, fmt, ...)                                      \
2675         __ext4_warning(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
2676 #define ext4_warning_inode(inode, fmt, ...)                             \
2677         __ext4_warning_inode(inode, __func__, __LINE__, fmt, ##__VA_ARGS__)
2678 #define ext4_msg(sb, level, fmt, ...)                           \
2679         __ext4_msg(sb, level, fmt, ##__VA_ARGS__)
2680 #define dump_mmp_msg(sb, mmp, msg)                                      \
2681         __dump_mmp_msg(sb, mmp, __func__, __LINE__, msg)
2682 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...)            \
2683         __ext4_grp_locked_error(__func__, __LINE__, sb, grp, ino, block, \
2684                                 fmt, ##__VA_ARGS__)
2685 
2686 #else
2687 
2688 #define ext4_error_inode(inode, func, line, block, fmt, ...)            \
2689 do {                                                                    \
2690         no_printk(fmt, ##__VA_ARGS__);                                  \
2691         __ext4_error_inode(inode, "", 0, block, " ");                   \
2692 } while (0)
2693 #define ext4_error_file(file, func, line, block, fmt, ...)              \
2694 do {                                                                    \
2695         no_printk(fmt, ##__VA_ARGS__);                                  \
2696         __ext4_error_file(file, "", 0, block, " ");                     \
2697 } while (0)
2698 #define ext4_error(sb, fmt, ...)                                        \
2699 do {                                                                    \
2700         no_printk(fmt, ##__VA_ARGS__);                                  \
2701         __ext4_error(sb, "", 0, " ");                                   \
2702 } while (0)
2703 #define ext4_abort(sb, fmt, ...)                                        \
2704 do {                                                                    \
2705         no_printk(fmt, ##__VA_ARGS__);                                  \
2706         __ext4_abort(sb, "", 0, " ");                                   \
2707 } while (0)
2708 #define ext4_warning(sb, fmt, ...)                                      \
2709 do {                                                                    \
2710         no_printk(fmt, ##__VA_ARGS__);                                  \
2711         __ext4_warning(sb, "", 0, " ");                                 \
2712 } while (0)
2713 #define ext4_warning_inode(inode, fmt, ...)                             \
2714 do {                                                                    \
2715         no_printk(fmt, ##__VA_ARGS__);                                  \
2716         __ext4_warning_inode(inode, "", 0, " ");                        \
2717 } while (0)
2718 #define ext4_msg(sb, level, fmt, ...)                                   \
2719 do {                                                                    \
2720         no_printk(fmt, ##__VA_ARGS__);                                  \
2721         __ext4_msg(sb, "", " ");                                        \
2722 } while (0)
2723 #define dump_mmp_msg(sb, mmp, msg)                                      \
2724         __dump_mmp_msg(sb, mmp, "", 0, "")
2725 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...)            \
2726 do {                                                                    \
2727         no_printk(fmt, ##__VA_ARGS__);                          \
2728         __ext4_grp_locked_error("", 0, sb, grp, ino, block, " ");       \
2729 } while (0)
2730 
2731 #endif
2732 
2733 extern void ext4_update_dynamic_rev(struct super_block *sb);
2734 extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb,
2735                                         __u32 compat);
2736 extern int ext4_update_rocompat_feature(handle_t *handle,
2737                                         struct super_block *sb, __u32 rocompat);
2738 extern int ext4_update_incompat_feature(handle_t *handle,
2739                                         struct super_block *sb, __u32 incompat);
2740 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
2741                                       struct ext4_group_desc *bg);
2742 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
2743                                       struct ext4_group_desc *bg);
2744 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
2745                                      struct ext4_group_desc *bg);
2746 extern __u32 ext4_free_group_clusters(struct super_block *sb,
2747                                       struct ext4_group_desc *bg);
2748 extern __u32 ext4_free_inodes_count(struct super_block *sb,
2749                                  struct ext4_group_desc *bg);
2750 extern __u32 ext4_used_dirs_count(struct super_block *sb,
2751                                 struct ext4_group_desc *bg);
2752 extern __u32 ext4_itable_unused_count(struct super_block *sb,
2753                                    struct ext4_group_desc *bg);
2754 extern void ext4_block_bitmap_set(struct super_block *sb,
2755                                   struct ext4_group_desc *bg, ext4_fsblk_t blk);
2756 extern void ext4_inode_bitmap_set(struct super_block *sb,
2757                                   struct ext4_group_desc *bg, ext4_fsblk_t blk);
2758 extern void ext4_inode_table_set(struct super_block *sb,
2759                                  struct ext4_group_desc *bg, ext4_fsblk_t blk);
2760 extern void ext4_free_group_clusters_set(struct super_block *sb,
2761                                          struct ext4_group_desc *bg,
2762                                          __u32 count);
2763 extern void ext4_free_inodes_set(struct super_block *sb,
2764                                 struct ext4_group_desc *bg, __u32 count);
2765 extern void ext4_used_dirs_set(struct super_block *sb,
2766                                 struct ext4_group_desc *bg, __u32 count);
2767 extern void ext4_itable_unused_set(struct super_block *sb,
2768                                    struct ext4_group_desc *bg, __u32 count);
2769 extern int ext4_group_desc_csum_verify(struct super_block *sb, __u32 group,
2770                                        struct ext4_group_desc *gdp);
2771 extern void ext4_group_desc_csum_set(struct super_block *sb, __u32 group,
2772                                      struct ext4_group_desc *gdp);
2773 extern int ext4_register_li_request(struct super_block *sb,
2774                                     ext4_group_t first_not_zeroed);
2775 
2776 static inline int ext4_has_group_desc_csum(struct super_block *sb)
2777 {
2778         return ext4_has_feature_gdt_csum(sb) ||
2779                EXT4_SB(sb)->s_chksum_driver != NULL;
2780 }
2781 
2782 static inline int ext4_has_metadata_csum(struct super_block *sb)
2783 {
2784         WARN_ON_ONCE(ext4_has_feature_metadata_csum(sb) &&
2785                      !EXT4_SB(sb)->s_chksum_driver);
2786 
2787         return (EXT4_SB(sb)->s_chksum_driver != NULL);
2788 }
2789 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
2790 {
2791         return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) |
2792                 le32_to_cpu(es->s_blocks_count_lo);
2793 }
2794 
2795 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
2796 {
2797         return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) |
2798                 le32_to_cpu(es->s_r_blocks_count_lo);
2799 }
2800 
2801 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
2802 {
2803         return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) |
2804                 le32_to_cpu(es->s_free_blocks_count_lo);
2805 }
2806 
2807 static inline void ext4_blocks_count_set(struct ext4_super_block *es,
2808                                          ext4_fsblk_t blk)
2809 {
2810         es->s_blocks_count_lo = cpu_to_le32((u32)blk);
2811         es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
2812 }
2813 
2814 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
2815                                               ext4_fsblk_t blk)
2816 {
2817         es->s_free_blocks_count_lo = cpu_to_le32((u32)blk);
2818         es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
2819 }
2820 
2821 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
2822                                            ext4_fsblk_t blk)
2823 {
2824         es->s_r_blocks_count_lo = cpu_to_le32((u32)blk);
2825         es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
2826 }
2827 
2828 static inline loff_t ext4_isize(struct ext4_inode *raw_inode)
2829 {
2830         if (S_ISREG(le16_to_cpu(raw_inode->i_mode)))
2831                 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) |
2832                         le32_to_cpu(raw_inode->i_size_lo);
2833         else
2834                 return (loff_t) le32_to_cpu(raw_inode->i_size_lo);
2835 }
2836 
2837 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size)
2838 {
2839         raw_inode->i_size_lo = cpu_to_le32(i_size);
2840         raw_inode->i_size_high = cpu_to_le32(i_size >> 32);
2841 }
2842 
2843 static inline
2844 struct ext4_group_info *ext4_get_group_info(struct super_block *sb,
2845                                             ext4_group_t group)
2846 {
2847          struct ext4_group_info ***grp_info;
2848          long indexv, indexh;
2849          BUG_ON(group >= EXT4_SB(sb)->s_groups_count);
2850          grp_info = EXT4_SB(sb)->s_group_info;
2851          indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb));
2852          indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1);
2853          return grp_info[indexv][indexh];
2854 }
2855 
2856 /*
2857  * Reading s_groups_count requires using smp_rmb() afterwards.  See
2858  * the locking protocol documented in the comments of ext4_group_add()
2859  * in resize.c
2860  */
2861 static inline ext4_group_t ext4_get_groups_count(struct super_block *sb)
2862 {
2863         ext4_group_t    ngroups = EXT4_SB(sb)->s_groups_count;
2864 
2865         smp_rmb();
2866         return ngroups;
2867 }
2868 
2869 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi,
2870                                              ext4_group_t block_group)
2871 {
2872         return block_group >> sbi->s_log_groups_per_flex;
2873 }
2874 
2875 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi)
2876 {
2877         return 1 << sbi->s_log_groups_per_flex;
2878 }
2879 
2880 #define ext4_std_error(sb, errno)                               \
2881 do {                                                            \
2882         if ((errno))                                            \
2883                 __ext4_std_error((sb), __func__, __LINE__, (errno));    \
2884 } while (0)
2885 
2886 #ifdef CONFIG_SMP
2887 /* Each CPU can accumulate percpu_counter_batch clusters in their local
2888  * counters. So we need to make sure we have free clusters more
2889  * than percpu_counter_batch  * nr_cpu_ids. Also add a window of 4 times.
2890  */
2891 #define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids))
2892 #else
2893 #define EXT4_FREECLUSTERS_WATERMARK 0
2894 #endif
2895 
2896 /* Update i_disksize. Requires i_mutex to avoid races with truncate */
2897 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize)
2898 {
2899         WARN_ON_ONCE(S_ISREG(inode->i_mode) &&
2900                      !inode_is_locked(inode));
2901         down_write(&EXT4_I(inode)->i_data_sem);
2902         if (newsize > EXT4_I(inode)->i_disksize)
2903                 EXT4_I(inode)->i_disksize = newsize;
2904         up_write(&EXT4_I(inode)->i_data_sem);
2905 }
2906 
2907 /* Update i_size, i_disksize. Requires i_mutex to avoid races with truncate */
2908 static inline int ext4_update_inode_size(struct inode *inode, loff_t newsize)
2909 {
2910         int changed = 0;
2911 
2912         if (newsize > inode->i_size) {
2913                 i_size_write(inode, newsize);
2914                 changed = 1;
2915         }
2916         if (newsize > EXT4_I(inode)->i_disksize) {
2917                 ext4_update_i_disksize(inode, newsize);
2918                 changed |= 2;
2919         }
2920         return changed;
2921 }
2922 
2923 int ext4_update_disksize_before_punch(struct inode *inode, loff_t offset,
2924                                       loff_t len);
2925 
2926 struct ext4_group_info {
2927         unsigned long   bb_state;
2928         struct rb_root  bb_free_root;
2929         ext4_grpblk_t   bb_first_free;  /* first free block */
2930         ext4_grpblk_t   bb_free;        /* total free blocks */
2931         ext4_grpblk_t   bb_fragments;   /* nr of freespace fragments */
2932         ext4_grpblk_t   bb_largest_free_order;/* order of largest frag in BG */
2933         struct          list_head bb_prealloc_list;
2934 #ifdef DOUBLE_CHECK
2935         void            *bb_bitmap;
2936 #endif
2937         struct rw_semaphore alloc_sem;
2938         ext4_grpblk_t   bb_counters[];  /* Nr of free power-of-two-block
2939                                          * regions, index is order.
2940                                          * bb_counters[3] = 5 means
2941                                          * 5 free 8-block regions. */
2942 };
2943 
2944 #define EXT4_GROUP_INFO_NEED_INIT_BIT           0
2945 #define EXT4_GROUP_INFO_WAS_TRIMMED_BIT         1
2946 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT     2
2947 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT     3
2948 
2949 #define EXT4_MB_GRP_NEED_INIT(grp)      \
2950         (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state)))
2951 #define EXT4_MB_GRP_BBITMAP_CORRUPT(grp)        \
2952         (test_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &((grp)->bb_state)))
2953 #define EXT4_MB_GRP_IBITMAP_CORRUPT(grp)        \
2954         (test_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &((grp)->bb_state)))
2955 
2956 #define EXT4_MB_GRP_WAS_TRIMMED(grp)    \
2957         (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2958 #define EXT4_MB_GRP_SET_TRIMMED(grp)    \
2959         (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2960 #define EXT4_MB_GRP_CLEAR_TRIMMED(grp)  \
2961         (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2962 
2963 #define EXT4_MAX_CONTENTION             8
2964 #define EXT4_CONTENTION_THRESHOLD       2
2965 
2966 static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb,
2967                                               ext4_group_t group)
2968 {
2969         return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group);
2970 }
2971 
2972 /*
2973  * Returns true if the filesystem is busy enough that attempts to
2974  * access the block group locks has run into contention.
2975  */
2976 static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi)
2977 {
2978         return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD);
2979 }
2980 
2981 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group)
2982 {
2983         spinlock_t *lock = ext4_group_lock_ptr(sb, group);
2984         if (spin_trylock(lock))
2985                 /*
2986                  * We're able to grab the lock right away, so drop the
2987                  * lock contention counter.
2988                  */
2989                 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0);
2990         else {
2991                 /*
2992                  * The lock is busy, so bump the contention counter,
2993                  * and then wait on the spin lock.
2994                  */
2995                 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1,
2996                                   EXT4_MAX_CONTENTION);
2997                 spin_lock(lock);
2998         }
2999 }
3000 
3001 static inline void ext4_unlock_group(struct super_block *sb,
3002                                         ext4_group_t group)
3003 {
3004         spin_unlock(ext4_group_lock_ptr(sb, group));
3005 }
3006 
3007 /*
3008  * Block validity checking
3009  */
3010 #define ext4_check_indirect_blockref(inode, bh)                         \
3011         ext4_check_blockref(__func__, __LINE__, inode,                  \
3012                             (__le32 *)(bh)->b_data,                     \
3013                             EXT4_ADDR_PER_BLOCK((inode)->i_sb))
3014 
3015 #define ext4_ind_check_inode(inode)                                     \
3016         ext4_check_blockref(__func__, __LINE__, inode,                  \
3017                             EXT4_I(inode)->i_data,                      \
3018                             EXT4_NDIR_BLOCKS)
3019 
3020 /*
3021  * Inodes and files operations
3022  */
3023 
3024 /* dir.c */
3025 extern const struct file_operations ext4_dir_operations;
3026 
3027 /* file.c */
3028 extern const struct inode_operations ext4_file_inode_operations;
3029 extern const struct file_operations ext4_file_operations;
3030 extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin);
3031 
3032 /* inline.c */
3033 extern int ext4_get_max_inline_size(struct inode *inode);
3034 extern int ext4_find_inline_data_nolock(struct inode *inode);
3035 extern int ext4_init_inline_data(handle_t *handle, struct inode *inode,
3036                                  unsigned int len);
3037 extern int ext4_destroy_inline_data(handle_t *handle, struct inode *inode);
3038 
3039 extern int ext4_readpage_inline(struct inode *inode, struct page *page);
3040 extern int ext4_try_to_write_inline_data(struct address_space *mapping,
3041                                          struct inode *inode,
3042                                          loff_t pos, unsigned len,
3043                                          unsigned flags,
3044                                          struct page **pagep);
3045 extern int ext4_write_inline_data_end(struct inode *inode,
3046                                       loff_t pos, unsigned len,
3047                                       unsigned copied,
3048                                       struct page *page);
3049 extern struct buffer_head *
3050 ext4_journalled_write_inline_data(struct inode *inode,
3051                                   unsigned len,
3052                                   struct page *page);
3053 extern int ext4_da_write_inline_data_begin(struct address_space *mapping,
3054                                            struct inode *inode,
3055                                            loff_t pos, unsigned len,
3056                                            unsigned flags,
3057                                            struct page **pagep,
3058                                            void **fsdata);
3059 extern int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos,
3060                                          unsigned len, unsigned copied,
3061                                          struct page *page);
3062 extern int ext4_try_add_inline_entry(handle_t *handle,
3063                                      struct ext4_filename *fname,
3064                                      struct inode *dir, struct inode *inode);
3065 extern int ext4_try_create_inline_dir(handle_t *handle,
3066                                       struct inode *parent,
3067                                       struct inode *inode);
3068 extern int ext4_read_inline_dir(struct file *filp,
3069                                 struct dir_context *ctx,
3070                                 int *has_inline_data);
3071 extern int htree_inlinedir_to_tree(struct file *dir_file,
3072                                    struct inode *dir, ext4_lblk_t block,
3073                                    struct dx_hash_info *hinfo,
3074                                    __u32 start_hash, __u32 start_minor_hash,
3075                                    int *has_inline_data);
3076 extern struct buffer_head *ext4_find_inline_entry(struct inode *dir,
3077                                         struct ext4_filename *fname,
3078                                         const struct qstr *d_name,
3079                                         struct ext4_dir_entry_2 **res_dir,
3080                                         int *has_inline_data);
3081 extern int ext4_delete_inline_entry(handle_t *handle,
3082                                     struct inode *dir,
3083                                     struct ext4_dir_entry_2 *de_del,
3084                                     struct buffer_head *bh,
3085                                     int *has_inline_data);
3086 extern int empty_inline_dir(struct inode *dir, int *has_inline_data);
3087 extern struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
3088                                         struct ext4_dir_entry_2 **parent_de,
3089                                         int *retval);
3090 extern int ext4_inline_data_fiemap(struct inode *inode,
3091                                    struct fiemap_extent_info *fieinfo,
3092                                    int *has_inline, __u64 start, __u64 len);
3093 extern int ext4_try_to_evict_inline_data(handle_t *handle,
3094                                          struct inode *inode,
3095                                          int needed);
3096 extern void ext4_inline_data_truncate(struct inode *inode, int *has_inline);
3097 
3098 extern int ext4_convert_inline_data(struct inode *inode);
3099 
3100 static inline int ext4_has_inline_data(struct inode *inode)
3101 {
3102         return ext4_test_inode_flag(inode, EXT4_INODE_INLINE_DATA) &&
3103                EXT4_I(inode)->i_inline_off;
3104 }
3105 
3106 /* namei.c */
3107 extern const struct inode_operations ext4_dir_inode_operations;
3108 extern const struct inode_operations ext4_special_inode_operations;
3109 extern struct dentry *ext4_get_parent(struct dentry *child);
3110 extern struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode,
3111                                  struct ext4_dir_entry_2 *de,
3112                                  int blocksize, int csum_size,
3113                                  unsigned int parent_ino, int dotdot_real_len);
3114 extern void initialize_dirent_tail(struct ext4_dir_entry_tail *t,
3115                                    unsigned int blocksize);
3116 extern int ext4_handle_dirty_dirent_node(handle_t *handle,
3117                                          struct inode *inode,
3118                                          struct buffer_head *bh);
3119 #define S_SHIFT 12
3120 static unsigned char ext4_type_by_mode[S_IFMT >> S_SHIFT] = {
3121         [S_IFREG >> S_SHIFT]    = EXT4_FT_REG_FILE,
3122         [S_IFDIR >> S_SHIFT]    = EXT4_FT_DIR,
3123         [S_IFCHR >> S_SHIFT]    = EXT4_FT_CHRDEV,
3124         [S_IFBLK >> S_SHIFT]    = EXT4_FT_BLKDEV,
3125         [S_IFIFO >> S_SHIFT]    = EXT4_FT_FIFO,
3126         [S_IFSOCK >> S_SHIFT]   = EXT4_FT_SOCK,
3127         [S_IFLNK >> S_SHIFT]    = EXT4_FT_SYMLINK,
3128 };
3129 
3130 static inline void ext4_set_de_type(struct super_block *sb,
3131                                 struct ext4_dir_entry_2 *de,
3132                                 umode_t mode) {
3133         if (ext4_has_feature_filetype(sb))
3134                 de->file_type = ext4_type_by_mode[(mode & S_IFMT)>>S_SHIFT];
3135 }
3136 
3137 /* readpages.c */
3138 extern int ext4_mpage_readpages(struct address_space *mapping,
3139                                 struct list_head *pages, struct page *page,
3140                                 unsigned nr_pages);
3141 
3142 /* symlink.c */
3143 extern const struct inode_operations ext4_encrypted_symlink_inode_operations;
3144 extern const struct inode_operations ext4_symlink_inode_operations;
3145 extern const struct inode_operations ext4_fast_symlink_inode_operations;
3146 
3147 /* sysfs.c */
3148 extern int ext4_register_sysfs(struct super_block *sb);
3149 extern void ext4_unregister_sysfs(struct super_block *sb);
3150 extern int __init ext4_init_sysfs(void);
3151 extern void ext4_exit_sysfs(void);
3152 
3153 /* block_validity */
3154 extern void ext4_release_system_zone(struct super_block *sb);
3155 extern int ext4_setup_system_zone(struct super_block *sb);
3156 extern int __init ext4_init_system_zone(void);
3157 extern void ext4_exit_system_zone(void);
3158 extern int ext4_data_block_valid(struct ext4_sb_info *sbi,
3159                                  ext4_fsblk_t start_blk,
3160                                  unsigned int count);
3161 extern int ext4_check_blockref(const char *, unsigned int,
3162                                struct inode *, __le32 *, unsigned int);
3163 
3164 /* extents.c */
3165 struct ext4_ext_path;
3166 struct ext4_extent;
3167 
3168 /*
3169  * Maximum number of logical blocks in a file; ext4_extent's ee_block is
3170  * __le32.
3171  */
3172 #define EXT_MAX_BLOCKS  0xffffffff
3173 
3174 extern int ext4_ext_tree_init(handle_t *handle, struct inode *);
3175 extern int ext4_ext_writepage_trans_blocks(struct inode *, int);
3176 extern int ext4_ext_index_trans_blocks(struct inode *inode, int extents);
3177 extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
3178                                struct ext4_map_blocks *map, int flags);
3179 extern void ext4_ext_truncate(handle_t *, struct inode *);
3180 extern int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start,
3181                                  ext4_lblk_t end);
3182 extern void ext4_ext_init(struct super_block *);
3183 extern void ext4_ext_release(struct super_block *);
3184 extern long ext4_fallocate(struct file *file, int mode, loff_t offset,
3185                           loff_t len);
3186 extern int ext4_convert_unwritten_extents(handle_t *handle, struct inode *inode,
3187                                           loff_t offset, ssize_t len);
3188 extern int ext4_map_blocks(handle_t *handle, struct inode *inode,
3189                            struct ext4_map_blocks *map, int flags);
3190 extern int ext4_ext_calc_metadata_amount(struct inode *inode,
3191                                          ext4_lblk_t lblocks);
3192 extern int ext4_ext_calc_credits_for_single_extent(struct inode *inode,
3193                                                    int num,
3194                                                    struct ext4_ext_path *path);
3195 extern int ext4_can_extents_be_merged(struct inode *inode,
3196                                       struct ext4_extent *ex1,
3197                                       struct ext4_extent *ex2);
3198 extern int ext4_ext_insert_extent(handle_t *, struct inode *,
3199                                   struct ext4_ext_path **,
3200                                   struct ext4_extent *, int);
3201 extern struct ext4_ext_path *ext4_find_extent(struct inode *, ext4_lblk_t,
3202                                               struct ext4_ext_path **,
3203                                               int flags);
3204 extern void ext4_ext_drop_refs(struct ext4_ext_path *);
3205 extern int ext4_ext_check_inode(struct inode *inode);
3206 extern int ext4_find_delalloc_range(struct inode *inode,
3207                                     ext4_lblk_t lblk_start,
3208                                     ext4_lblk_t lblk_end);
3209 extern int ext4_find_delalloc_cluster(struct inode *inode, ext4_lblk_t lblk);
3210 extern ext4_lblk_t ext4_ext_next_allocated_block(struct ext4_ext_path *path);
3211 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
3212                         __u64 start, __u64 len);
3213 extern int ext4_ext_precache(struct inode *inode);
3214 extern int ext4_collapse_range(struct inode *inode, loff_t offset, loff_t len);
3215 extern int ext4_insert_range(struct inode *inode, loff_t offset, loff_t len);
3216 extern int ext4_swap_extents(handle_t *handle, struct inode *inode1,
3217                                 struct inode *inode2, ext4_lblk_t lblk1,
3218                              ext4_lblk_t lblk2,  ext4_lblk_t count,
3219                              int mark_unwritten,int *err);
3220 
3221 /* move_extent.c */
3222 extern void ext4_double_down_write_data_sem(struct inode *first,
3223                                             struct inode *second);
3224 extern void ext4_double_up_write_data_sem(struct inode *orig_inode,
3225                                           struct inode *donor_inode);
3226 extern int ext4_move_extents(struct file *o_filp, struct file *d_filp,
3227                              __u64 start_orig, __u64 start_donor,
3228                              __u64 len, __u64 *moved_len);
3229 
3230 /* page-io.c */
3231 extern int __init ext4_init_pageio(void);
3232 extern void ext4_exit_pageio(void);
3233 extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags);
3234 extern ext4_io_end_t *ext4_get_io_end(ext4_io_end_t *io_end);
3235 extern int ext4_put_io_end(ext4_io_end_t *io_end);
3236 extern void ext4_put_io_end_defer(ext4_io_end_t *io_end);
3237 extern void ext4_io_submit_init(struct ext4_io_submit *io,
3238                                 struct writeback_control *wbc);
3239 extern void ext4_end_io_rsv_work(struct work_struct *work);
3240 extern void ext4_io_submit(struct ext4_io_submit *io);
3241 extern int ext4_bio_write_page(struct ext4_io_submit *io,
3242                                struct page *page,
3243                                int len,
3244                                struct writeback_control *wbc,
3245                                bool keep_towrite);
3246 
3247 /* mmp.c */
3248 extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t);
3249 
3250 /*
3251  * Add new method to test whether block and inode bitmaps are properly
3252  * initialized. With uninit_bg reading the block from disk is not enough
3253  * to mark the bitmap uptodate. We need to also zero-out the bitmap
3254  */
3255 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart
3256 
3257 static inline int bitmap_uptodate(struct buffer_head *bh)
3258 {
3259         return (buffer_uptodate(bh) &&
3260                         test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state));
3261 }
3262 static inline void set_bitmap_uptodate(struct buffer_head *bh)
3263 {
3264         set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state);
3265 }
3266 
3267 /*
3268  * Disable DIO read nolock optimization, so new dioreaders will be forced
3269  * to grab i_mutex
3270  */
3271 static inline void ext4_inode_block_unlocked_dio(struct inode *inode)
3272 {
3273         ext4_set_inode_state(inode, EXT4_STATE_DIOREAD_LOCK);
3274         smp_mb();
3275 }
3276 static inline void ext4_inode_resume_unlocked_dio(struct inode *inode)
3277 {
3278         smp_mb();
3279         ext4_clear_inode_state(inode, EXT4_STATE_DIOREAD_LOCK);
3280 }
3281 
3282 #define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1)
3283 
3284 /* For ioend & aio unwritten conversion wait queues */
3285 #define EXT4_WQ_HASH_SZ         37
3286 #define ext4_ioend_wq(v)   (&ext4__ioend_wq[((unsigned long)(v)) %\
3287                                             EXT4_WQ_HASH_SZ])
3288 #define ext4_aio_mutex(v)  (&ext4__aio_mutex[((unsigned long)(v)) %\
3289                                              EXT4_WQ_HASH_SZ])
3290 extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
3291 extern struct mutex ext4__aio_mutex[EXT4_WQ_HASH_SZ];
3292 
3293 #define EXT4_RESIZING   0
3294 extern int ext4_resize_begin(struct super_block *sb);
3295 extern void ext4_resize_end(struct super_block *sb);
3296 
3297 #endif  /* __KERNEL__ */
3298 
3299 #define EFSBADCRC       EBADMSG         /* Bad CRC detected */
3300 #define EFSCORRUPTED    EUCLEAN         /* Filesystem is corrupted */
3301 
3302 #endif  /* _EXT4_H */
3303 

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