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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 #include <linux/percpu-rwsem.h>
 37 #ifdef __KERNEL__
 38 #include <linux/compat.h>
 39 #endif
 40 
 41 /*
 42  * The fourth extended filesystem constants/structures
 43  */
 44 
 45 /*
 46  * with AGGRESSIVE_CHECK allocator runs consistency checks over
 47  * structures. these checks slow things down a lot
 48  */
 49 #define AGGRESSIVE_CHECK__
 50 
 51 /*
 52  * with DOUBLE_CHECK defined mballoc creates persistent in-core
 53  * bitmaps, maintains and uses them to check for double allocations
 54  */
 55 #define DOUBLE_CHECK__
 56 
 57 /*
 58  * Define EXT4FS_DEBUG to produce debug messages
 59  */
 60 #undef EXT4FS_DEBUG
 61 
 62 /*
 63  * Debug code
 64  */
 65 #ifdef EXT4FS_DEBUG
 66 #define ext4_debug(f, a...)                                             \
 67         do {                                                            \
 68                 printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:",        \
 69                         __FILE__, __LINE__, __func__);                  \
 70                 printk(KERN_DEBUG f, ## a);                             \
 71         } while (0)
 72 #else
 73 #define ext4_debug(fmt, ...)    no_printk(fmt, ##__VA_ARGS__)
 74 #endif
 75 
 76 /*
 77  * Turn on EXT_DEBUG to get lots of info about extents operations.
 78  */
 79 #define EXT_DEBUG__
 80 #ifdef EXT_DEBUG
 81 #define ext_debug(fmt, ...)     printk(fmt, ##__VA_ARGS__)
 82 #else
 83 #define ext_debug(fmt, ...)     no_printk(fmt, ##__VA_ARGS__)
 84 #endif
 85 
 86 /* data type for block offset of block group */
 87 typedef int ext4_grpblk_t;
 88 
 89 /* data type for filesystem-wide blocks number */
 90 typedef unsigned long long ext4_fsblk_t;
 91 
 92 /* data type for file logical block number */
 93 typedef __u32 ext4_lblk_t;
 94 
 95 /* data type for block group number */
 96 typedef unsigned int ext4_group_t;
 97 
 98 enum SHIFT_DIRECTION {
 99         SHIFT_LEFT = 0,
100         SHIFT_RIGHT,
101 };
102 
103 /*
104  * Flags used in mballoc's allocation_context flags field.
105  *
106  * Also used to show what's going on for debugging purposes when the
107  * flag field is exported via the traceport interface
108  */
109 
110 /* prefer goal again. length */
111 #define EXT4_MB_HINT_MERGE              0x0001
112 /* blocks already reserved */
113 #define EXT4_MB_HINT_RESERVED           0x0002
114 /* metadata is being allocated */
115 #define EXT4_MB_HINT_METADATA           0x0004
116 /* first blocks in the file */
117 #define EXT4_MB_HINT_FIRST              0x0008
118 /* search for the best chunk */
119 #define EXT4_MB_HINT_BEST               0x0010
120 /* data is being allocated */
121 #define EXT4_MB_HINT_DATA               0x0020
122 /* don't preallocate (for tails) */
123 #define EXT4_MB_HINT_NOPREALLOC         0x0040
124 /* allocate for locality group */
125 #define EXT4_MB_HINT_GROUP_ALLOC        0x0080
126 /* allocate goal blocks or none */
127 #define EXT4_MB_HINT_GOAL_ONLY          0x0100
128 /* goal is meaningful */
129 #define EXT4_MB_HINT_TRY_GOAL           0x0200
130 /* blocks already pre-reserved by delayed allocation */
131 #define EXT4_MB_DELALLOC_RESERVED       0x0400
132 /* We are doing stream allocation */
133 #define EXT4_MB_STREAM_ALLOC            0x0800
134 /* Use reserved root blocks if needed */
135 #define EXT4_MB_USE_ROOT_BLOCKS         0x1000
136 /* Use blocks from reserved pool */
137 #define EXT4_MB_USE_RESERVED            0x2000
138 
139 struct ext4_allocation_request {
140         /* target inode for block we're allocating */
141         struct inode *inode;
142         /* how many blocks we want to allocate */
143         unsigned int len;
144         /* logical block in target inode */
145         ext4_lblk_t logical;
146         /* the closest logical allocated block to the left */
147         ext4_lblk_t lleft;
148         /* the closest logical allocated block to the right */
149         ext4_lblk_t lright;
150         /* phys. target (a hint) */
151         ext4_fsblk_t goal;
152         /* phys. block for the closest logical allocated block to the left */
153         ext4_fsblk_t pleft;
154         /* phys. block for the closest logical allocated block to the right */
155         ext4_fsblk_t pright;
156         /* flags. see above EXT4_MB_HINT_* */
157         unsigned int flags;
158 };
159 
160 /*
161  * Logical to physical block mapping, used by ext4_map_blocks()
162  *
163  * This structure is used to pass requests into ext4_map_blocks() as
164  * well as to store the information returned by ext4_map_blocks().  It
165  * takes less room on the stack than a struct buffer_head.
166  */
167 #define EXT4_MAP_NEW            (1 << BH_New)
168 #define EXT4_MAP_MAPPED         (1 << BH_Mapped)
169 #define EXT4_MAP_UNWRITTEN      (1 << BH_Unwritten)
170 #define EXT4_MAP_BOUNDARY       (1 << BH_Boundary)
171 #define EXT4_MAP_FLAGS          (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\
172                                  EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY)
173 
174 struct ext4_map_blocks {
175         ext4_fsblk_t m_pblk;
176         ext4_lblk_t m_lblk;
177         unsigned int m_len;
178         unsigned int m_flags;
179 };
180 
181 /*
182  * Flags for ext4_io_end->flags
183  */
184 #define EXT4_IO_END_UNWRITTEN   0x0001
185 
186 /*
187  * For converting unwritten extents on a work queue. 'handle' is used for
188  * buffered writeback.
189  */
190 typedef struct ext4_io_end {
191         struct list_head        list;           /* per-file finished IO list */
192         handle_t                *handle;        /* handle reserved for extent
193                                                  * conversion */
194         struct inode            *inode;         /* file being written to */
195         struct bio              *bio;           /* Linked list of completed
196                                                  * bios covering the extent */
197         unsigned int            flag;           /* unwritten or not */
198         atomic_t                count;          /* reference counter */
199         loff_t                  offset;         /* offset in the file */
200         ssize_t                 size;           /* size of the extent */
201 } ext4_io_end_t;
202 
203 struct ext4_io_submit {
204         struct writeback_control *io_wbc;
205         struct bio              *io_bio;
206         ext4_io_end_t           *io_end;
207         sector_t                io_next_block;
208 };
209 
210 /*
211  * Special inodes numbers
212  */
213 #define EXT4_BAD_INO             1      /* Bad blocks inode */
214 #define EXT4_ROOT_INO            2      /* Root inode */
215 #define EXT4_USR_QUOTA_INO       3      /* User quota inode */
216 #define EXT4_GRP_QUOTA_INO       4      /* Group quota inode */
217 #define EXT4_BOOT_LOADER_INO     5      /* Boot loader inode */
218 #define EXT4_UNDEL_DIR_INO       6      /* Undelete directory inode */
219 #define EXT4_RESIZE_INO          7      /* Reserved group descriptors inode */
220 #define EXT4_JOURNAL_INO         8      /* Journal inode */
221 
222 /* First non-reserved inode for old ext4 filesystems */
223 #define EXT4_GOOD_OLD_FIRST_INO 11
224 
225 /*
226  * Maximal count of links to a file
227  */
228 #define EXT4_LINK_MAX           65000
229 
230 /*
231  * Macro-instructions used to manage several block sizes
232  */
233 #define EXT4_MIN_BLOCK_SIZE             1024
234 #define EXT4_MAX_BLOCK_SIZE             65536
235 #define EXT4_MIN_BLOCK_LOG_SIZE         10
236 #define EXT4_MAX_BLOCK_LOG_SIZE         16
237 #ifdef __KERNEL__
238 # define EXT4_BLOCK_SIZE(s)             ((s)->s_blocksize)
239 #else
240 # define EXT4_BLOCK_SIZE(s)             (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
241 #endif
242 #define EXT4_ADDR_PER_BLOCK(s)          (EXT4_BLOCK_SIZE(s) / sizeof(__u32))
243 #define EXT4_CLUSTER_SIZE(s)            (EXT4_BLOCK_SIZE(s) << \
244                                          EXT4_SB(s)->s_cluster_bits)
245 #ifdef __KERNEL__
246 # define EXT4_BLOCK_SIZE_BITS(s)        ((s)->s_blocksize_bits)
247 # define EXT4_CLUSTER_BITS(s)           (EXT4_SB(s)->s_cluster_bits)
248 #else
249 # define EXT4_BLOCK_SIZE_BITS(s)        ((s)->s_log_block_size + 10)
250 #endif
251 #ifdef __KERNEL__
252 #define EXT4_ADDR_PER_BLOCK_BITS(s)     (EXT4_SB(s)->s_addr_per_block_bits)
253 #define EXT4_INODE_SIZE(s)              (EXT4_SB(s)->s_inode_size)
254 #define EXT4_FIRST_INO(s)               (EXT4_SB(s)->s_first_ino)
255 #else
256 #define EXT4_INODE_SIZE(s)      (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
257                                  EXT4_GOOD_OLD_INODE_SIZE : \
258                                  (s)->s_inode_size)
259 #define EXT4_FIRST_INO(s)       (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
260                                  EXT4_GOOD_OLD_FIRST_INO : \
261                                  (s)->s_first_ino)
262 #endif
263 #define EXT4_BLOCK_ALIGN(size, blkbits)         ALIGN((size), (1 << (blkbits)))
264 
265 /* Translate a block number to a cluster number */
266 #define EXT4_B2C(sbi, blk)      ((blk) >> (sbi)->s_cluster_bits)
267 /* Translate a cluster number to a block number */
268 #define EXT4_C2B(sbi, cluster)  ((cluster) << (sbi)->s_cluster_bits)
269 /* Translate # of blks to # of clusters */
270 #define EXT4_NUM_B2C(sbi, blks) (((blks) + (sbi)->s_cluster_ratio - 1) >> \
271                                  (sbi)->s_cluster_bits)
272 /* Mask out the low bits to get the starting block of the cluster */
273 #define EXT4_PBLK_CMASK(s, pblk) ((pblk) &                              \
274                                   ~((ext4_fsblk_t) (s)->s_cluster_ratio - 1))
275 #define EXT4_LBLK_CMASK(s, lblk) ((lblk) &                              \
276                                   ~((ext4_lblk_t) (s)->s_cluster_ratio - 1))
277 /* Get the cluster offset */
278 #define EXT4_PBLK_COFF(s, pblk) ((pblk) &                               \
279                                  ((ext4_fsblk_t) (s)->s_cluster_ratio - 1))
280 #define EXT4_LBLK_COFF(s, lblk) ((lblk) &                               \
281                                  ((ext4_lblk_t) (s)->s_cluster_ratio - 1))
282 
283 /*
284  * Structure of a blocks group descriptor
285  */
286 struct ext4_group_desc
287 {
288         __le32  bg_block_bitmap_lo;     /* Blocks bitmap block */
289         __le32  bg_inode_bitmap_lo;     /* Inodes bitmap block */
290         __le32  bg_inode_table_lo;      /* Inodes table block */
291         __le16  bg_free_blocks_count_lo;/* Free blocks count */
292         __le16  bg_free_inodes_count_lo;/* Free inodes count */
293         __le16  bg_used_dirs_count_lo;  /* Directories count */
294         __le16  bg_flags;               /* EXT4_BG_flags (INODE_UNINIT, etc) */
295         __le32  bg_exclude_bitmap_lo;   /* Exclude bitmap for snapshots */
296         __le16  bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bbitmap) LE */
297         __le16  bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+ibitmap) LE */
298         __le16  bg_itable_unused_lo;    /* Unused inodes count */
299         __le16  bg_checksum;            /* crc16(sb_uuid+group+desc) */
300         __le32  bg_block_bitmap_hi;     /* Blocks bitmap block MSB */
301         __le32  bg_inode_bitmap_hi;     /* Inodes bitmap block MSB */
302         __le32  bg_inode_table_hi;      /* Inodes table block MSB */
303         __le16  bg_free_blocks_count_hi;/* Free blocks count MSB */
304         __le16  bg_free_inodes_count_hi;/* Free inodes count MSB */
305         __le16  bg_used_dirs_count_hi;  /* Directories count MSB */
306         __le16  bg_itable_unused_hi;    /* Unused inodes count MSB */
307         __le32  bg_exclude_bitmap_hi;   /* Exclude bitmap block MSB */
308         __le16  bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bbitmap) BE */
309         __le16  bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+ibitmap) BE */
310         __u32   bg_reserved;
311 };
312 
313 #define EXT4_BG_INODE_BITMAP_CSUM_HI_END        \
314         (offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \
315          sizeof(__le16))
316 #define EXT4_BG_BLOCK_BITMAP_CSUM_HI_END        \
317         (offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \
318          sizeof(__le16))
319 
320 /*
321  * Structure of a flex block group info
322  */
323 
324 struct flex_groups {
325         atomic64_t      free_clusters;
326         atomic_t        free_inodes;
327         atomic_t        used_dirs;
328 };
329 
330 #define EXT4_BG_INODE_UNINIT    0x0001 /* Inode table/bitmap not in use */
331 #define EXT4_BG_BLOCK_UNINIT    0x0002 /* Block bitmap not in use */
332 #define EXT4_BG_INODE_ZEROED    0x0004 /* On-disk itable initialized to zero */
333 
334 /*
335  * Macro-instructions used to manage group descriptors
336  */
337 #define EXT4_MIN_DESC_SIZE              32
338 #define EXT4_MIN_DESC_SIZE_64BIT        64
339 #define EXT4_MAX_DESC_SIZE              EXT4_MIN_BLOCK_SIZE
340 #define EXT4_DESC_SIZE(s)               (EXT4_SB(s)->s_desc_size)
341 #ifdef __KERNEL__
342 # define EXT4_BLOCKS_PER_GROUP(s)       (EXT4_SB(s)->s_blocks_per_group)
343 # define EXT4_CLUSTERS_PER_GROUP(s)     (EXT4_SB(s)->s_clusters_per_group)
344 # define EXT4_DESC_PER_BLOCK(s)         (EXT4_SB(s)->s_desc_per_block)
345 # define EXT4_INODES_PER_GROUP(s)       (EXT4_SB(s)->s_inodes_per_group)
346 # define EXT4_DESC_PER_BLOCK_BITS(s)    (EXT4_SB(s)->s_desc_per_block_bits)
347 #else
348 # define EXT4_BLOCKS_PER_GROUP(s)       ((s)->s_blocks_per_group)
349 # define EXT4_DESC_PER_BLOCK(s)         (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
350 # define EXT4_INODES_PER_GROUP(s)       ((s)->s_inodes_per_group)
351 #endif
352 
353 /*
354  * Constants relative to the data blocks
355  */
356 #define EXT4_NDIR_BLOCKS                12
357 #define EXT4_IND_BLOCK                  EXT4_NDIR_BLOCKS
358 #define EXT4_DIND_BLOCK                 (EXT4_IND_BLOCK + 1)
359 #define EXT4_TIND_BLOCK                 (EXT4_DIND_BLOCK + 1)
360 #define EXT4_N_BLOCKS                   (EXT4_TIND_BLOCK + 1)
361 
362 /*
363  * Inode flags
364  */
365 #define EXT4_SECRM_FL                   0x00000001 /* Secure deletion */
366 #define EXT4_UNRM_FL                    0x00000002 /* Undelete */
367 #define EXT4_COMPR_FL                   0x00000004 /* Compress file */
368 #define EXT4_SYNC_FL                    0x00000008 /* Synchronous updates */
369 #define EXT4_IMMUTABLE_FL               0x00000010 /* Immutable file */
370 #define EXT4_APPEND_FL                  0x00000020 /* writes to file may only append */
371 #define EXT4_NODUMP_FL                  0x00000040 /* do not dump file */
372 #define EXT4_NOATIME_FL                 0x00000080 /* do not update atime */
373 /* Reserved for compression usage... */
374 #define EXT4_DIRTY_FL                   0x00000100
375 #define EXT4_COMPRBLK_FL                0x00000200 /* One or more compressed clusters */
376 #define EXT4_NOCOMPR_FL                 0x00000400 /* Don't compress */
377         /* nb: was previously EXT2_ECOMPR_FL */
378 #define EXT4_ENCRYPT_FL                 0x00000800 /* encrypted file */
379 /* End compression flags --- maybe not all used */
380 #define EXT4_INDEX_FL                   0x00001000 /* hash-indexed directory */
381 #define EXT4_IMAGIC_FL                  0x00002000 /* AFS directory */
382 #define EXT4_JOURNAL_DATA_FL            0x00004000 /* file data should be journaled */
383 #define EXT4_NOTAIL_FL                  0x00008000 /* file tail should not be merged */
384 #define EXT4_DIRSYNC_FL                 0x00010000 /* dirsync behaviour (directories only) */
385 #define EXT4_TOPDIR_FL                  0x00020000 /* Top of directory hierarchies*/
386 #define EXT4_HUGE_FILE_FL               0x00040000 /* Set to each huge file */
387 #define EXT4_EXTENTS_FL                 0x00080000 /* Inode uses extents */
388 #define EXT4_EA_INODE_FL                0x00200000 /* Inode used for large EA */
389 #define EXT4_EOFBLOCKS_FL               0x00400000 /* Blocks allocated beyond EOF */
390 #define EXT4_INLINE_DATA_FL             0x10000000 /* Inode has inline data. */
391 #define EXT4_PROJINHERIT_FL             0x20000000 /* Create with parents projid */
392 #define EXT4_RESERVED_FL                0x80000000 /* reserved for ext4 lib */
393 
394 #define EXT4_FL_USER_VISIBLE            0x304BDFFF /* User visible flags */
395 #define EXT4_FL_USER_MODIFIABLE         0x204380FF /* User modifiable flags */
396 
397 #define EXT4_FL_XFLAG_VISIBLE           (EXT4_SYNC_FL | \
398                                          EXT4_IMMUTABLE_FL | \
399                                          EXT4_APPEND_FL | \
400                                          EXT4_NODUMP_FL | \
401                                          EXT4_NOATIME_FL | \
402                                          EXT4_PROJINHERIT_FL)
403 
404 /* Flags that should be inherited by new inodes from their parent. */
405 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\
406                            EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\
407                            EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\
408                            EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL |\
409                            EXT4_PROJINHERIT_FL)
410 
411 /* Flags that are appropriate for regular files (all but dir-specific ones). */
412 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL))
413 
414 /* Flags that are appropriate for non-directories/regular files. */
415 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL)
416 
417 /* Mask out flags that are inappropriate for the given type of inode. */
418 static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags)
419 {
420         if (S_ISDIR(mode))
421                 return flags;
422         else if (S_ISREG(mode))
423                 return flags & EXT4_REG_FLMASK;
424         else
425                 return flags & EXT4_OTHER_FLMASK;
426 }
427 
428 /*
429  * Inode flags used for atomic set/get
430  */
431 enum {
432         EXT4_INODE_SECRM        = 0,    /* Secure deletion */
433         EXT4_INODE_UNRM         = 1,    /* Undelete */
434         EXT4_INODE_COMPR        = 2,    /* Compress file */
435         EXT4_INODE_SYNC         = 3,    /* Synchronous updates */
436         EXT4_INODE_IMMUTABLE    = 4,    /* Immutable file */
437         EXT4_INODE_APPEND       = 5,    /* writes to file may only append */
438         EXT4_INODE_NODUMP       = 6,    /* do not dump file */
439         EXT4_INODE_NOATIME      = 7,    /* do not update atime */
440 /* Reserved for compression usage... */
441         EXT4_INODE_DIRTY        = 8,
442         EXT4_INODE_COMPRBLK     = 9,    /* One or more compressed clusters */
443         EXT4_INODE_NOCOMPR      = 10,   /* Don't compress */
444         EXT4_INODE_ENCRYPT      = 11,   /* Encrypted file */
445 /* End compression flags --- maybe not all used */
446         EXT4_INODE_INDEX        = 12,   /* hash-indexed directory */
447         EXT4_INODE_IMAGIC       = 13,   /* AFS directory */
448         EXT4_INODE_JOURNAL_DATA = 14,   /* file data should be journaled */
449         EXT4_INODE_NOTAIL       = 15,   /* file tail should not be merged */
450         EXT4_INODE_DIRSYNC      = 16,   /* dirsync behaviour (directories only) */
451         EXT4_INODE_TOPDIR       = 17,   /* Top of directory hierarchies*/
452         EXT4_INODE_HUGE_FILE    = 18,   /* Set to each huge file */
453         EXT4_INODE_EXTENTS      = 19,   /* Inode uses extents */
454         EXT4_INODE_EA_INODE     = 21,   /* Inode used for large EA */
455         EXT4_INODE_EOFBLOCKS    = 22,   /* Blocks allocated beyond EOF */
456         EXT4_INODE_INLINE_DATA  = 28,   /* Data in inode. */
457         EXT4_INODE_PROJINHERIT  = 29,   /* Create with parents projid */
458         EXT4_INODE_RESERVED     = 31,   /* reserved for ext4 lib */
459 };
460 
461 /*
462  * Since it's pretty easy to mix up bit numbers and hex values, we use a
463  * build-time check to make sure that EXT4_XXX_FL is consistent with respect to
464  * EXT4_INODE_XXX. If all is well, the macros will be dropped, so, it won't cost
465  * any extra space in the compiled kernel image, otherwise, the build will fail.
466  * It's important that these values are the same, since we are using
467  * EXT4_INODE_XXX to test for flag values, but EXT4_XXX_FL must be consistent
468  * with the values of FS_XXX_FL defined in include/linux/fs.h and the on-disk
469  * values found in ext2, ext3 and ext4 filesystems, and of course the values
470  * defined in e2fsprogs.
471  *
472  * It's not paranoia if the Murphy's Law really *is* out to get you.  :-)
473  */
474 #define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG))
475 #define CHECK_FLAG_VALUE(FLAG) BUILD_BUG_ON(!TEST_FLAG_VALUE(FLAG))
476 
477 static inline void ext4_check_flag_values(void)
478 {
479         CHECK_FLAG_VALUE(SECRM);
480         CHECK_FLAG_VALUE(UNRM);
481         CHECK_FLAG_VALUE(COMPR);
482         CHECK_FLAG_VALUE(SYNC);
483         CHECK_FLAG_VALUE(IMMUTABLE);
484         CHECK_FLAG_VALUE(APPEND);
485         CHECK_FLAG_VALUE(NODUMP);
486         CHECK_FLAG_VALUE(NOATIME);
487         CHECK_FLAG_VALUE(DIRTY);
488         CHECK_FLAG_VALUE(COMPRBLK);
489         CHECK_FLAG_VALUE(NOCOMPR);
490         CHECK_FLAG_VALUE(ENCRYPT);
491         CHECK_FLAG_VALUE(INDEX);
492         CHECK_FLAG_VALUE(IMAGIC);
493         CHECK_FLAG_VALUE(JOURNAL_DATA);
494         CHECK_FLAG_VALUE(NOTAIL);
495         CHECK_FLAG_VALUE(DIRSYNC);
496         CHECK_FLAG_VALUE(TOPDIR);
497         CHECK_FLAG_VALUE(HUGE_FILE);
498         CHECK_FLAG_VALUE(EXTENTS);
499         CHECK_FLAG_VALUE(EA_INODE);
500         CHECK_FLAG_VALUE(EOFBLOCKS);
501         CHECK_FLAG_VALUE(INLINE_DATA);
502         CHECK_FLAG_VALUE(PROJINHERIT);
503         CHECK_FLAG_VALUE(RESERVED);
504 }
505 
506 /* Used to pass group descriptor data when online resize is done */
507 struct ext4_new_group_input {
508         __u32 group;            /* Group number for this data */
509         __u64 block_bitmap;     /* Absolute block number of block bitmap */
510         __u64 inode_bitmap;     /* Absolute block number of inode bitmap */
511         __u64 inode_table;      /* Absolute block number of inode table start */
512         __u32 blocks_count;     /* Total number of blocks in this group */
513         __u16 reserved_blocks;  /* Number of reserved blocks in this group */
514         __u16 unused;
515 };
516 
517 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
518 struct compat_ext4_new_group_input {
519         u32 group;
520         compat_u64 block_bitmap;
521         compat_u64 inode_bitmap;
522         compat_u64 inode_table;
523         u32 blocks_count;
524         u16 reserved_blocks;
525         u16 unused;
526 };
527 #endif
528 
529 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */
530 struct ext4_new_group_data {
531         __u32 group;
532         __u64 block_bitmap;
533         __u64 inode_bitmap;
534         __u64 inode_table;
535         __u32 blocks_count;
536         __u16 reserved_blocks;
537         __u16 unused;
538         __u32 free_blocks_count;
539 };
540 
541 /* Indexes used to index group tables in ext4_new_group_data */
542 enum {
543         BLOCK_BITMAP = 0,       /* block bitmap */
544         INODE_BITMAP,           /* inode bitmap */
545         INODE_TABLE,            /* inode tables */
546         GROUP_TABLE_COUNT,
547 };
548 
549 /*
550  * Flags used by ext4_map_blocks()
551  */
552         /* Allocate any needed blocks and/or convert an unwritten
553            extent to be an initialized ext4 */
554 #define EXT4_GET_BLOCKS_CREATE                  0x0001
555         /* Request the creation of an unwritten extent */
556 #define EXT4_GET_BLOCKS_UNWRIT_EXT              0x0002
557 #define EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT       (EXT4_GET_BLOCKS_UNWRIT_EXT|\
558                                                  EXT4_GET_BLOCKS_CREATE)
559         /* Caller is from the delayed allocation writeout path
560          * finally doing the actual allocation of delayed blocks */
561 #define EXT4_GET_BLOCKS_DELALLOC_RESERVE        0x0004
562         /* caller is from the direct IO path, request to creation of an
563         unwritten extents if not allocated, split the unwritten
564         extent if blocks has been preallocated already*/
565 #define EXT4_GET_BLOCKS_PRE_IO                  0x0008
566 #define EXT4_GET_BLOCKS_CONVERT                 0x0010
567 #define EXT4_GET_BLOCKS_IO_CREATE_EXT           (EXT4_GET_BLOCKS_PRE_IO|\
568                                          EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT)
569         /* Convert extent to initialized after IO complete */
570 #define EXT4_GET_BLOCKS_IO_CONVERT_EXT          (EXT4_GET_BLOCKS_CONVERT|\
571                                          EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT)
572         /* Eventual metadata allocation (due to growing extent tree)
573          * should not fail, so try to use reserved blocks for that.*/
574 #define EXT4_GET_BLOCKS_METADATA_NOFAIL         0x0020
575         /* Don't normalize allocation size (used for fallocate) */
576 #define EXT4_GET_BLOCKS_NO_NORMALIZE            0x0040
577         /* Request will not result in inode size update (user for fallocate) */
578 #define EXT4_GET_BLOCKS_KEEP_SIZE               0x0080
579         /* Convert written extents to unwritten */
580 #define EXT4_GET_BLOCKS_CONVERT_UNWRITTEN       0x0100
581         /* Write zeros to newly created written extents */
582 #define EXT4_GET_BLOCKS_ZERO                    0x0200
583 #define EXT4_GET_BLOCKS_CREATE_ZERO             (EXT4_GET_BLOCKS_CREATE |\
584                                         EXT4_GET_BLOCKS_ZERO)
585         /* Caller will submit data before dropping transaction handle. This
586          * allows jbd2 to avoid submitting data before commit. */
587 #define EXT4_GET_BLOCKS_IO_SUBMIT               0x0400
588 
589 /*
590  * The bit position of these flags must not overlap with any of the
591  * EXT4_GET_BLOCKS_*.  They are used by ext4_find_extent(),
592  * read_extent_tree_block(), ext4_split_extent_at(),
593  * ext4_ext_insert_extent(), and ext4_ext_create_new_leaf().
594  * EXT4_EX_NOCACHE is used to indicate that the we shouldn't be
595  * caching the extents when reading from the extent tree while a
596  * truncate or punch hole operation is in progress.
597  */
598 #define EXT4_EX_NOCACHE                         0x40000000
599 #define EXT4_EX_FORCE_CACHE                     0x20000000
600 
601 /*
602  * Flags used by ext4_free_blocks
603  */
604 #define EXT4_FREE_BLOCKS_METADATA       0x0001
605 #define EXT4_FREE_BLOCKS_FORGET         0x0002
606 #define EXT4_FREE_BLOCKS_VALIDATED      0x0004
607 #define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE 0x0008
608 #define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER   0x0010
609 #define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER    0x0020
610 
611 /* Encryption algorithms */
612 #define EXT4_ENCRYPTION_MODE_INVALID            0
613 #define EXT4_ENCRYPTION_MODE_AES_256_XTS        1
614 #define EXT4_ENCRYPTION_MODE_AES_256_GCM        2
615 #define EXT4_ENCRYPTION_MODE_AES_256_CBC        3
616 #define EXT4_ENCRYPTION_MODE_AES_256_CTS        4
617 
618 #include "ext4_crypto.h"
619 
620 /*
621  * ioctl commands
622  */
623 #define EXT4_IOC_GETFLAGS               FS_IOC_GETFLAGS
624 #define EXT4_IOC_SETFLAGS               FS_IOC_SETFLAGS
625 #define EXT4_IOC_GETVERSION             _IOR('f', 3, long)
626 #define EXT4_IOC_SETVERSION             _IOW('f', 4, long)
627 #define EXT4_IOC_GETVERSION_OLD         FS_IOC_GETVERSION
628 #define EXT4_IOC_SETVERSION_OLD         FS_IOC_SETVERSION
629 #define EXT4_IOC_GETRSVSZ               _IOR('f', 5, long)
630 #define EXT4_IOC_SETRSVSZ               _IOW('f', 6, long)
631 #define EXT4_IOC_GROUP_EXTEND           _IOW('f', 7, unsigned long)
632 #define EXT4_IOC_GROUP_ADD              _IOW('f', 8, struct ext4_new_group_input)
633 #define EXT4_IOC_MIGRATE                _IO('f', 9)
634  /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */
635  /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */
636 #define EXT4_IOC_ALLOC_DA_BLKS          _IO('f', 12)
637 #define EXT4_IOC_MOVE_EXT               _IOWR('f', 15, struct move_extent)
638 #define EXT4_IOC_RESIZE_FS              _IOW('f', 16, __u64)
639 #define EXT4_IOC_SWAP_BOOT              _IO('f', 17)
640 #define EXT4_IOC_PRECACHE_EXTENTS       _IO('f', 18)
641 #define EXT4_IOC_SET_ENCRYPTION_POLICY  _IOR('f', 19, struct ext4_encryption_policy)
642 #define EXT4_IOC_GET_ENCRYPTION_PWSALT  _IOW('f', 20, __u8[16])
643 #define EXT4_IOC_GET_ENCRYPTION_POLICY  _IOW('f', 21, struct ext4_encryption_policy)
644 
645 #ifndef FS_IOC_FSGETXATTR
646 /* Until the uapi changes get merged for project quota... */
647 
648 #define FS_IOC_FSGETXATTR               _IOR('X', 31, struct fsxattr)
649 #define FS_IOC_FSSETXATTR               _IOW('X', 32, struct fsxattr)
650 
651 /*
652  * Structure for FS_IOC_FSGETXATTR and FS_IOC_FSSETXATTR.
653  */
654 struct fsxattr {
655         __u32           fsx_xflags;     /* xflags field value (get/set) */
656         __u32           fsx_extsize;    /* extsize field value (get/set)*/
657         __u32           fsx_nextents;   /* nextents field value (get)   */
658         __u32           fsx_projid;     /* project identifier (get/set) */
659         unsigned char   fsx_pad[12];
660 };
661 
662 /*
663  * Flags for the fsx_xflags field
664  */
665 #define FS_XFLAG_REALTIME       0x00000001      /* data in realtime volume */
666 #define FS_XFLAG_PREALLOC       0x00000002      /* preallocated file extents */
667 #define FS_XFLAG_IMMUTABLE      0x00000008      /* file cannot be modified */
668 #define FS_XFLAG_APPEND         0x00000010      /* all writes append */
669 #define FS_XFLAG_SYNC           0x00000020      /* all writes synchronous */
670 #define FS_XFLAG_NOATIME        0x00000040      /* do not update access time */
671 #define FS_XFLAG_NODUMP         0x00000080      /* do not include in backups */
672 #define FS_XFLAG_RTINHERIT      0x00000100      /* create with rt bit set */
673 #define FS_XFLAG_PROJINHERIT    0x00000200      /* create with parents projid */
674 #define FS_XFLAG_NOSYMLINKS     0x00000400      /* disallow symlink creation */
675 #define FS_XFLAG_EXTSIZE        0x00000800      /* extent size allocator hint */
676 #define FS_XFLAG_EXTSZINHERIT   0x00001000      /* inherit inode extent size */
677 #define FS_XFLAG_NODEFRAG       0x00002000      /* do not defragment */
678 #define FS_XFLAG_FILESTREAM     0x00004000      /* use filestream allocator */
679 #define FS_XFLAG_HASATTR        0x80000000      /* no DIFLAG for this */
680 #endif /* !defined(FS_IOC_FSGETXATTR) */
681 
682 #define EXT4_IOC_FSGETXATTR             FS_IOC_FSGETXATTR
683 #define EXT4_IOC_FSSETXATTR             FS_IOC_FSSETXATTR
684 
685 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
686 /*
687  * ioctl commands in 32 bit emulation
688  */
689 #define EXT4_IOC32_GETFLAGS             FS_IOC32_GETFLAGS
690 #define EXT4_IOC32_SETFLAGS             FS_IOC32_SETFLAGS
691 #define EXT4_IOC32_GETVERSION           _IOR('f', 3, int)
692 #define EXT4_IOC32_SETVERSION           _IOW('f', 4, int)
693 #define EXT4_IOC32_GETRSVSZ             _IOR('f', 5, int)
694 #define EXT4_IOC32_SETRSVSZ             _IOW('f', 6, int)
695 #define EXT4_IOC32_GROUP_EXTEND         _IOW('f', 7, unsigned int)
696 #define EXT4_IOC32_GROUP_ADD            _IOW('f', 8, struct compat_ext4_new_group_input)
697 #define EXT4_IOC32_GETVERSION_OLD       FS_IOC32_GETVERSION
698 #define EXT4_IOC32_SETVERSION_OLD       FS_IOC32_SETVERSION
699 #endif
700 
701 /* Max physical block we can address w/o extents */
702 #define EXT4_MAX_BLOCK_FILE_PHYS        0xFFFFFFFF
703 
704 /*
705  * Structure of an inode on the disk
706  */
707 struct ext4_inode {
708         __le16  i_mode;         /* File mode */
709         __le16  i_uid;          /* Low 16 bits of Owner Uid */
710         __le32  i_size_lo;      /* Size in bytes */
711         __le32  i_atime;        /* Access time */
712         __le32  i_ctime;        /* Inode Change time */
713         __le32  i_mtime;        /* Modification time */
714         __le32  i_dtime;        /* Deletion Time */
715         __le16  i_gid;          /* Low 16 bits of Group Id */
716         __le16  i_links_count;  /* Links count */
717         __le32  i_blocks_lo;    /* Blocks count */
718         __le32  i_flags;        /* File flags */
719         union {
720                 struct {
721                         __le32  l_i_version;
722                 } linux1;
723                 struct {
724                         __u32  h_i_translator;
725                 } hurd1;
726                 struct {
727                         __u32  m_i_reserved1;
728                 } masix1;
729         } osd1;                         /* OS dependent 1 */
730         __le32  i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
731         __le32  i_generation;   /* File version (for NFS) */
732         __le32  i_file_acl_lo;  /* File ACL */
733         __le32  i_size_high;
734         __le32  i_obso_faddr;   /* Obsoleted fragment address */
735         union {
736                 struct {
737                         __le16  l_i_blocks_high; /* were l_i_reserved1 */
738                         __le16  l_i_file_acl_high;
739                         __le16  l_i_uid_high;   /* these 2 fields */
740                         __le16  l_i_gid_high;   /* were reserved2[0] */
741                         __le16  l_i_checksum_lo;/* crc32c(uuid+inum+inode) LE */
742                         __le16  l_i_reserved;
743                 } linux2;
744                 struct {
745                         __le16  h_i_reserved1;  /* Obsoleted fragment number/size which are removed in ext4 */
746                         __u16   h_i_mode_high;
747                         __u16   h_i_uid_high;
748                         __u16   h_i_gid_high;
749                         __u32   h_i_author;
750                 } hurd2;
751                 struct {
752                         __le16  h_i_reserved1;  /* Obsoleted fragment number/size which are removed in ext4 */
753                         __le16  m_i_file_acl_high;
754                         __u32   m_i_reserved2[2];
755                 } masix2;
756         } osd2;                         /* OS dependent 2 */
757         __le16  i_extra_isize;
758         __le16  i_checksum_hi;  /* crc32c(uuid+inum+inode) BE */
759         __le32  i_ctime_extra;  /* extra Change time      (nsec << 2 | epoch) */
760         __le32  i_mtime_extra;  /* extra Modification time(nsec << 2 | epoch) */
761         __le32  i_atime_extra;  /* extra Access time      (nsec << 2 | epoch) */
762         __le32  i_crtime;       /* File Creation time */
763         __le32  i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */
764         __le32  i_version_hi;   /* high 32 bits for 64-bit version */
765         __le32  i_projid;       /* Project ID */
766 };
767 
768 struct move_extent {
769         __u32 reserved;         /* should be zero */
770         __u32 donor_fd;         /* donor file descriptor */
771         __u64 orig_start;       /* logical start offset in block for orig */
772         __u64 donor_start;      /* logical start offset in block for donor */
773         __u64 len;              /* block length to be moved */
774         __u64 moved_len;        /* moved block length */
775 };
776 
777 #define EXT4_EPOCH_BITS 2
778 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
779 #define EXT4_NSEC_MASK  (~0UL << EXT4_EPOCH_BITS)
780 
781 /*
782  * Extended fields will fit into an inode if the filesystem was formatted
783  * with large inodes (-I 256 or larger) and there are not currently any EAs
784  * consuming all of the available space. For new inodes we always reserve
785  * enough space for the kernel's known extended fields, but for inodes
786  * created with an old kernel this might not have been the case. None of
787  * the extended inode fields is critical for correct filesystem operation.
788  * This macro checks if a certain field fits in the inode. Note that
789  * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
790  */
791 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field)   \
792         ((offsetof(typeof(*ext4_inode), field) +        \
793           sizeof((ext4_inode)->field))                  \
794         <= (EXT4_GOOD_OLD_INODE_SIZE +                  \
795             (einode)->i_extra_isize))                   \
796 
797 /*
798  * We use an encoding that preserves the times for extra epoch "00":
799  *
800  * extra  msb of                         adjust for signed
801  * epoch  32-bit                         32-bit tv_sec to
802  * bits   time    decoded 64-bit tv_sec  64-bit tv_sec      valid time range
803  * 0 0    1    -0x80000000..-0x00000001  0x000000000 1901-12-13..1969-12-31
804  * 0 0    0    0x000000000..0x07fffffff  0x000000000 1970-01-01..2038-01-19
805  * 0 1    1    0x080000000..0x0ffffffff  0x100000000 2038-01-19..2106-02-07
806  * 0 1    0    0x100000000..0x17fffffff  0x100000000 2106-02-07..2174-02-25
807  * 1 0    1    0x180000000..0x1ffffffff  0x200000000 2174-02-25..2242-03-16
808  * 1 0    0    0x200000000..0x27fffffff  0x200000000 2242-03-16..2310-04-04
809  * 1 1    1    0x280000000..0x2ffffffff  0x300000000 2310-04-04..2378-04-22
810  * 1 1    0    0x300000000..0x37fffffff  0x300000000 2378-04-22..2446-05-10
811  *
812  * Note that previous versions of the kernel on 64-bit systems would
813  * incorrectly use extra epoch bits 1,1 for dates between 1901 and
814  * 1970.  e2fsck will correct this, assuming that it is run on the
815  * affected filesystem before 2242.
816  */
817 
818 static inline __le32 ext4_encode_extra_time(struct timespec *time)
819 {
820         u32 extra = sizeof(time->tv_sec) > 4 ?
821                 ((time->tv_sec - (s32)time->tv_sec) >> 32) & EXT4_EPOCH_MASK : 0;
822         return cpu_to_le32(extra | (time->tv_nsec << EXT4_EPOCH_BITS));
823 }
824 
825 static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra)
826 {
827         if (unlikely(sizeof(time->tv_sec) > 4 &&
828                         (extra & cpu_to_le32(EXT4_EPOCH_MASK)))) {
829 #if LINUX_VERSION_CODE < KERNEL_VERSION(4,20,0)
830                 /* Handle legacy encoding of pre-1970 dates with epoch
831                  * bits 1,1.  We assume that by kernel version 4.20,
832                  * everyone will have run fsck over the affected
833                  * filesystems to correct the problem.  (This
834                  * backwards compatibility may be removed before this
835                  * time, at the discretion of the ext4 developers.)
836                  */
837                 u64 extra_bits = le32_to_cpu(extra) & EXT4_EPOCH_MASK;
838                 if (extra_bits == 3 && ((time->tv_sec) & 0x80000000) != 0)
839                         extra_bits = 0;
840                 time->tv_sec += extra_bits << 32;
841 #else
842                 time->tv_sec += (u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) << 32;
843 #endif
844         }
845         time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS;
846 }
847 
848 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode)                          \
849 do {                                                                           \
850         (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec);               \
851         if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra))     \
852                 (raw_inode)->xtime ## _extra =                                 \
853                                 ext4_encode_extra_time(&(inode)->xtime);       \
854 } while (0)
855 
856 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode)                        \
857 do {                                                                           \
858         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime))                      \
859                 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec);      \
860         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra))            \
861                 (raw_inode)->xtime ## _extra =                                 \
862                                 ext4_encode_extra_time(&(einode)->xtime);      \
863 } while (0)
864 
865 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode)                          \
866 do {                                                                           \
867         (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime);       \
868         if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra))     \
869                 ext4_decode_extra_time(&(inode)->xtime,                        \
870                                        raw_inode->xtime ## _extra);            \
871         else                                                                   \
872                 (inode)->xtime.tv_nsec = 0;                                    \
873 } while (0)
874 
875 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode)                        \
876 do {                                                                           \
877         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime))                      \
878                 (einode)->xtime.tv_sec =                                       \
879                         (signed)le32_to_cpu((raw_inode)->xtime);               \
880         else                                                                   \
881                 (einode)->xtime.tv_sec = 0;                                    \
882         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra))            \
883                 ext4_decode_extra_time(&(einode)->xtime,                       \
884                                        raw_inode->xtime ## _extra);            \
885         else                                                                   \
886                 (einode)->xtime.tv_nsec = 0;                                   \
887 } while (0)
888 
889 #define i_disk_version osd1.linux1.l_i_version
890 
891 #if defined(__KERNEL__) || defined(__linux__)
892 #define i_reserved1     osd1.linux1.l_i_reserved1
893 #define i_file_acl_high osd2.linux2.l_i_file_acl_high
894 #define i_blocks_high   osd2.linux2.l_i_blocks_high
895 #define i_uid_low       i_uid
896 #define i_gid_low       i_gid
897 #define i_uid_high      osd2.linux2.l_i_uid_high
898 #define i_gid_high      osd2.linux2.l_i_gid_high
899 #define i_checksum_lo   osd2.linux2.l_i_checksum_lo
900 
901 #elif defined(__GNU__)
902 
903 #define i_translator    osd1.hurd1.h_i_translator
904 #define i_uid_high      osd2.hurd2.h_i_uid_high
905 #define i_gid_high      osd2.hurd2.h_i_gid_high
906 #define i_author        osd2.hurd2.h_i_author
907 
908 #elif defined(__masix__)
909 
910 #define i_reserved1     osd1.masix1.m_i_reserved1
911 #define i_file_acl_high osd2.masix2.m_i_file_acl_high
912 #define i_reserved2     osd2.masix2.m_i_reserved2
913 
914 #endif /* defined(__KERNEL__) || defined(__linux__) */
915 
916 #include "extents_status.h"
917 
918 /*
919  * Lock subclasses for i_data_sem in the ext4_inode_info structure.
920  *
921  * These are needed to avoid lockdep false positives when we need to
922  * allocate blocks to the quota inode during ext4_map_blocks(), while
923  * holding i_data_sem for a normal (non-quota) inode.  Since we don't
924  * do quota tracking for the quota inode, this avoids deadlock (as
925  * well as infinite recursion, since it isn't turtles all the way
926  * down...)
927  *
928  *  I_DATA_SEM_NORMAL - Used for most inodes
929  *  I_DATA_SEM_OTHER  - Used by move_inode.c for the second normal inode
930  *                        where the second inode has larger inode number
931  *                        than the first
932  *  I_DATA_SEM_QUOTA  - Used for quota inodes only
933  */
934 enum {
935         I_DATA_SEM_NORMAL = 0,
936         I_DATA_SEM_OTHER,
937         I_DATA_SEM_QUOTA,
938 };
939 
940 
941 /*
942  * fourth extended file system inode data in memory
943  */
944 struct ext4_inode_info {
945         __le32  i_data[15];     /* unconverted */
946         __u32   i_dtime;
947         ext4_fsblk_t    i_file_acl;
948 
949         /*
950          * i_block_group is the number of the block group which contains
951          * this file's inode.  Constant across the lifetime of the inode,
952          * it is ued for making block allocation decisions - we try to
953          * place a file's data blocks near its inode block, and new inodes
954          * near to their parent directory's inode.
955          */
956         ext4_group_t    i_block_group;
957         ext4_lblk_t     i_dir_start_lookup;
958 #if (BITS_PER_LONG < 64)
959         unsigned long   i_state_flags;          /* Dynamic state flags */
960 #endif
961         unsigned long   i_flags;
962 
963         /*
964          * Extended attributes can be read independently of the main file
965          * data. Taking i_mutex even when reading would cause contention
966          * between readers of EAs and writers of regular file data, so
967          * instead we synchronize on xattr_sem when reading or changing
968          * EAs.
969          */
970         struct rw_semaphore xattr_sem;
971 
972         struct list_head i_orphan;      /* unlinked but open inodes */
973 
974         /*
975          * i_disksize keeps track of what the inode size is ON DISK, not
976          * in memory.  During truncate, i_size is set to the new size by
977          * the VFS prior to calling ext4_truncate(), but the filesystem won't
978          * set i_disksize to 0 until the truncate is actually under way.
979          *
980          * The intent is that i_disksize always represents the blocks which
981          * are used by this file.  This allows recovery to restart truncate
982          * on orphans if we crash during truncate.  We actually write i_disksize
983          * into the on-disk inode when writing inodes out, instead of i_size.
984          *
985          * The only time when i_disksize and i_size may be different is when
986          * a truncate is in progress.  The only things which change i_disksize
987          * are ext4_get_block (growth) and ext4_truncate (shrinkth).
988          */
989         loff_t  i_disksize;
990 
991         /*
992          * i_data_sem is for serialising ext4_truncate() against
993          * ext4_getblock().  In the 2.4 ext2 design, great chunks of inode's
994          * data tree are chopped off during truncate. We can't do that in
995          * ext4 because whenever we perform intermediate commits during
996          * truncate, the inode and all the metadata blocks *must* be in a
997          * consistent state which allows truncation of the orphans to restart
998          * during recovery.  Hence we must fix the get_block-vs-truncate race
999          * by other means, so we have i_data_sem.
1000          */
1001         struct rw_semaphore i_data_sem;
1002         /*
1003          * i_mmap_sem is for serializing page faults with truncate / punch hole
1004          * operations. We have to make sure that new page cannot be faulted in
1005          * a section of the inode that is being punched. We cannot easily use
1006          * i_data_sem for this since we need protection for the whole punch
1007          * operation and i_data_sem ranks below transaction start so we have
1008          * to occasionally drop it.
1009          */
1010         struct rw_semaphore i_mmap_sem;
1011         struct inode vfs_inode;
1012         struct jbd2_inode *jinode;
1013 
1014         spinlock_t i_raw_lock;  /* protects updates to the raw inode */
1015 
1016         /*
1017          * File creation time. Its function is same as that of
1018          * struct timespec i_{a,c,m}time in the generic inode.
1019          */
1020         struct timespec i_crtime;
1021 
1022         /* mballoc */
1023         struct list_head i_prealloc_list;
1024         spinlock_t i_prealloc_lock;
1025 
1026         /* extents status tree */
1027         struct ext4_es_tree i_es_tree;
1028         rwlock_t i_es_lock;
1029         struct list_head i_es_list;
1030         unsigned int i_es_all_nr;       /* protected by i_es_lock */
1031         unsigned int i_es_shk_nr;       /* protected by i_es_lock */
1032         ext4_lblk_t i_es_shrink_lblk;   /* Offset where we start searching for
1033                                            extents to shrink. Protected by
1034                                            i_es_lock  */
1035 
1036         /* ialloc */
1037         ext4_group_t    i_last_alloc_group;
1038 
1039         /* allocation reservation info for delalloc */
1040         /* In case of bigalloc, these refer to clusters rather than blocks */
1041         unsigned int i_reserved_data_blocks;
1042         unsigned int i_reserved_meta_blocks;
1043         unsigned int i_allocated_meta_blocks;
1044         ext4_lblk_t i_da_metadata_calc_last_lblock;
1045         int i_da_metadata_calc_len;
1046 
1047         /* on-disk additional length */
1048         __u16 i_extra_isize;
1049 
1050         /* Indicate the inline data space. */
1051         u16 i_inline_off;
1052         u16 i_inline_size;
1053 
1054 #ifdef CONFIG_QUOTA
1055         /* quota space reservation, managed internally by quota code */
1056         qsize_t i_reserved_quota;
1057 #endif
1058 
1059         /* Lock protecting lists below */
1060         spinlock_t i_completed_io_lock;
1061         /*
1062          * Completed IOs that need unwritten extents handling and have
1063          * transaction reserved
1064          */
1065         struct list_head i_rsv_conversion_list;
1066         struct work_struct i_rsv_conversion_work;
1067         atomic_t i_unwritten; /* Nr. of inflight conversions pending */
1068 
1069         spinlock_t i_block_reservation_lock;
1070 
1071         /*
1072          * Transactions that contain inode's metadata needed to complete
1073          * fsync and fdatasync, respectively.
1074          */
1075         tid_t i_sync_tid;
1076         tid_t i_datasync_tid;
1077 
1078 #ifdef CONFIG_QUOTA
1079         struct dquot *i_dquot[MAXQUOTAS];
1080 #endif
1081 
1082         /* Precomputed uuid+inum+igen checksum for seeding inode checksums */
1083         __u32 i_csum_seed;
1084 
1085 #ifdef CONFIG_EXT4_FS_ENCRYPTION
1086         /* Encryption params */
1087         struct ext4_crypt_info *i_crypt_info;
1088 #endif
1089         kprojid_t i_projid;
1090 };
1091 
1092 /*
1093  * File system states
1094  */
1095 #define EXT4_VALID_FS                   0x0001  /* Unmounted cleanly */
1096 #define EXT4_ERROR_FS                   0x0002  /* Errors detected */
1097 #define EXT4_ORPHAN_FS                  0x0004  /* Orphans being recovered */
1098 
1099 /*
1100  * Misc. filesystem flags
1101  */
1102 #define EXT2_FLAGS_SIGNED_HASH          0x0001  /* Signed dirhash in use */
1103 #define EXT2_FLAGS_UNSIGNED_HASH        0x0002  /* Unsigned dirhash in use */
1104 #define EXT2_FLAGS_TEST_FILESYS         0x0004  /* to test development code */
1105 
1106 /*
1107  * Mount flags set via mount options or defaults
1108  */
1109 #define EXT4_MOUNT_GRPID                0x00004 /* Create files with directory's group */
1110 #define EXT4_MOUNT_DEBUG                0x00008 /* Some debugging messages */
1111 #define EXT4_MOUNT_ERRORS_CONT          0x00010 /* Continue on errors */
1112 #define EXT4_MOUNT_ERRORS_RO            0x00020 /* Remount fs ro on errors */
1113 #define EXT4_MOUNT_ERRORS_PANIC         0x00040 /* Panic on errors */
1114 #define EXT4_MOUNT_ERRORS_MASK          0x00070
1115 #define EXT4_MOUNT_MINIX_DF             0x00080 /* Mimics the Minix statfs */
1116 #define EXT4_MOUNT_NOLOAD               0x00100 /* Don't use existing journal*/
1117 #ifdef CONFIG_FS_DAX
1118 #define EXT4_MOUNT_DAX                  0x00200 /* Direct Access */
1119 #else
1120 #define EXT4_MOUNT_DAX                  0
1121 #endif
1122 #define EXT4_MOUNT_DATA_FLAGS           0x00C00 /* Mode for data writes: */
1123 #define EXT4_MOUNT_JOURNAL_DATA         0x00400 /* Write data to journal */
1124 #define EXT4_MOUNT_ORDERED_DATA         0x00800 /* Flush data before commit */
1125 #define EXT4_MOUNT_WRITEBACK_DATA       0x00C00 /* No data ordering */
1126 #define EXT4_MOUNT_UPDATE_JOURNAL       0x01000 /* Update the journal format */
1127 #define EXT4_MOUNT_NO_UID32             0x02000  /* Disable 32-bit UIDs */
1128 #define EXT4_MOUNT_XATTR_USER           0x04000 /* Extended user attributes */
1129 #define EXT4_MOUNT_POSIX_ACL            0x08000 /* POSIX Access Control Lists */
1130 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC     0x10000 /* No auto delalloc mapping */
1131 #define EXT4_MOUNT_BARRIER              0x20000 /* Use block barriers */
1132 #define EXT4_MOUNT_QUOTA                0x80000 /* Some quota option set */
1133 #define EXT4_MOUNT_USRQUOTA             0x100000 /* "old" user quota */
1134 #define EXT4_MOUNT_GRPQUOTA             0x200000 /* "old" group quota */
1135 #define EXT4_MOUNT_DIOREAD_NOLOCK       0x400000 /* Enable support for dio read nolocking */
1136 #define EXT4_MOUNT_JOURNAL_CHECKSUM     0x800000 /* Journal checksums */
1137 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */
1138 #define EXT4_MOUNT_DELALLOC             0x8000000 /* Delalloc support */
1139 #define EXT4_MOUNT_DATA_ERR_ABORT       0x10000000 /* Abort on file data write */
1140 #define EXT4_MOUNT_BLOCK_VALIDITY       0x20000000 /* Block validity checking */
1141 #define EXT4_MOUNT_DISCARD              0x40000000 /* Issue DISCARD requests */
1142 #define EXT4_MOUNT_INIT_INODE_TABLE     0x80000000 /* Initialize uninitialized itables */
1143 
1144 /*
1145  * Mount flags set either automatically (could not be set by mount option)
1146  * based on per file system feature or property or in special cases such as
1147  * distinguishing between explicit mount option definition and default.
1148  */
1149 #define EXT4_MOUNT2_EXPLICIT_DELALLOC   0x00000001 /* User explicitly
1150                                                       specified delalloc */
1151 #define EXT4_MOUNT2_STD_GROUP_SIZE      0x00000002 /* We have standard group
1152                                                       size of blocksize * 8
1153                                                       blocks */
1154 #define EXT4_MOUNT2_HURD_COMPAT         0x00000004 /* Support HURD-castrated
1155                                                       file systems */
1156 
1157 #define EXT4_MOUNT2_EXPLICIT_JOURNAL_CHECKSUM   0x00000008 /* User explicitly
1158                                                 specified journal checksum */
1159 
1160 #define clear_opt(sb, opt)              EXT4_SB(sb)->s_mount_opt &= \
1161                                                 ~EXT4_MOUNT_##opt
1162 #define set_opt(sb, opt)                EXT4_SB(sb)->s_mount_opt |= \
1163                                                 EXT4_MOUNT_##opt
1164 #define test_opt(sb, opt)               (EXT4_SB(sb)->s_mount_opt & \
1165                                          EXT4_MOUNT_##opt)
1166 
1167 #define clear_opt2(sb, opt)             EXT4_SB(sb)->s_mount_opt2 &= \
1168                                                 ~EXT4_MOUNT2_##opt
1169 #define set_opt2(sb, opt)               EXT4_SB(sb)->s_mount_opt2 |= \
1170                                                 EXT4_MOUNT2_##opt
1171 #define test_opt2(sb, opt)              (EXT4_SB(sb)->s_mount_opt2 & \
1172                                          EXT4_MOUNT2_##opt)
1173 
1174 #define ext4_test_and_set_bit           __test_and_set_bit_le
1175 #define ext4_set_bit                    __set_bit_le
1176 #define ext4_set_bit_atomic             ext2_set_bit_atomic
1177 #define ext4_test_and_clear_bit         __test_and_clear_bit_le
1178 #define ext4_clear_bit                  __clear_bit_le
1179 #define ext4_clear_bit_atomic           ext2_clear_bit_atomic
1180 #define ext4_test_bit                   test_bit_le
1181 #define ext4_find_next_zero_bit         find_next_zero_bit_le
1182 #define ext4_find_next_bit              find_next_bit_le
1183 
1184 extern void ext4_set_bits(void *bm, int cur, int len);
1185 
1186 /*
1187  * Maximal mount counts between two filesystem checks
1188  */
1189 #define EXT4_DFL_MAX_MNT_COUNT          20      /* Allow 20 mounts */
1190 #define EXT4_DFL_CHECKINTERVAL          0       /* Don't use interval check */
1191 
1192 /*
1193  * Behaviour when detecting errors
1194  */
1195 #define EXT4_ERRORS_CONTINUE            1       /* Continue execution */
1196 #define EXT4_ERRORS_RO                  2       /* Remount fs read-only */
1197 #define EXT4_ERRORS_PANIC               3       /* Panic */
1198 #define EXT4_ERRORS_DEFAULT             EXT4_ERRORS_CONTINUE
1199 
1200 /* Metadata checksum algorithm codes */
1201 #define EXT4_CRC32C_CHKSUM              1
1202 
1203 /*
1204  * Structure of the super block
1205  */
1206 struct ext4_super_block {
1207 /*00*/  __le32  s_inodes_count;         /* Inodes count */
1208         __le32  s_blocks_count_lo;      /* Blocks count */
1209         __le32  s_r_blocks_count_lo;    /* Reserved blocks count */
1210         __le32  s_free_blocks_count_lo; /* Free blocks count */
1211 /*10*/  __le32  s_free_inodes_count;    /* Free inodes count */
1212         __le32  s_first_data_block;     /* First Data Block */
1213         __le32  s_log_block_size;       /* Block size */
1214         __le32  s_log_cluster_size;     /* Allocation cluster size */
1215 /*20*/  __le32  s_blocks_per_group;     /* # Blocks per group */
1216         __le32  s_clusters_per_group;   /* # Clusters per group */
1217         __le32  s_inodes_per_group;     /* # Inodes per group */
1218         __le32  s_mtime;                /* Mount time */
1219 /*30*/  __le32  s_wtime;                /* Write time */
1220         __le16  s_mnt_count;            /* Mount count */
1221         __le16  s_max_mnt_count;        /* Maximal mount count */
1222         __le16  s_magic;                /* Magic signature */
1223         __le16  s_state;                /* File system state */
1224         __le16  s_errors;               /* Behaviour when detecting errors */
1225         __le16  s_minor_rev_level;      /* minor revision level */
1226 /*40*/  __le32  s_lastcheck;            /* time of last check */
1227         __le32  s_checkinterval;        /* max. time between checks */
1228         __le32  s_creator_os;           /* OS */
1229         __le32  s_rev_level;            /* Revision level */
1230 /*50*/  __le16  s_def_resuid;           /* Default uid for reserved blocks */
1231         __le16  s_def_resgid;           /* Default gid for reserved blocks */
1232         /*
1233          * These fields are for EXT4_DYNAMIC_REV superblocks only.
1234          *
1235          * Note: the difference between the compatible feature set and
1236          * the incompatible feature set is that if there is a bit set
1237          * in the incompatible feature set that the kernel doesn't
1238          * know about, it should refuse to mount the filesystem.
1239          *
1240          * e2fsck's requirements are more strict; if it doesn't know
1241          * about a feature in either the compatible or incompatible
1242          * feature set, it must abort and not try to meddle with
1243          * things it doesn't understand...
1244          */
1245         __le32  s_first_ino;            /* First non-reserved inode */
1246         __le16  s_inode_size;           /* size of inode structure */
1247         __le16  s_block_group_nr;       /* block group # of this superblock */
1248         __le32  s_feature_compat;       /* compatible feature set */
1249 /*60*/  __le32  s_feature_incompat;     /* incompatible feature set */
1250         __le32  s_feature_ro_compat;    /* readonly-compatible feature set */
1251 /*68*/  __u8    s_uuid[16];             /* 128-bit uuid for volume */
1252 /*78*/  char    s_volume_name[16];      /* volume name */
1253 /*88*/  char    s_last_mounted[64];     /* directory where last mounted */
1254 /*C8*/  __le32  s_algorithm_usage_bitmap; /* For compression */
1255         /*
1256          * Performance hints.  Directory preallocation should only
1257          * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
1258          */
1259         __u8    s_prealloc_blocks;      /* Nr of blocks to try to preallocate*/
1260         __u8    s_prealloc_dir_blocks;  /* Nr to preallocate for dirs */
1261         __le16  s_reserved_gdt_blocks;  /* Per group desc for online growth */
1262         /*
1263          * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
1264          */
1265 /*D0*/  __u8    s_journal_uuid[16];     /* uuid of journal superblock */
1266 /*E0*/  __le32  s_journal_inum;         /* inode number of journal file */
1267         __le32  s_journal_dev;          /* device number of journal file */
1268         __le32  s_last_orphan;          /* start of list of inodes to delete */
1269         __le32  s_hash_seed[4];         /* HTREE hash seed */
1270         __u8    s_def_hash_version;     /* Default hash version to use */
1271         __u8    s_jnl_backup_type;
1272         __le16  s_desc_size;            /* size of group descriptor */
1273 /*100*/ __le32  s_default_mount_opts;
1274         __le32  s_first_meta_bg;        /* First metablock block group */
1275         __le32  s_mkfs_time;            /* When the filesystem was created */
1276         __le32  s_jnl_blocks[17];       /* Backup of the journal inode */
1277         /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
1278 /*150*/ __le32  s_blocks_count_hi;      /* Blocks count */
1279         __le32  s_r_blocks_count_hi;    /* Reserved blocks count */
1280         __le32  s_free_blocks_count_hi; /* Free blocks count */
1281         __le16  s_min_extra_isize;      /* All inodes have at least # bytes */
1282         __le16  s_want_extra_isize;     /* New inodes should reserve # bytes */
1283         __le32  s_flags;                /* Miscellaneous flags */
1284         __le16  s_raid_stride;          /* RAID stride */
1285         __le16  s_mmp_update_interval;  /* # seconds to wait in MMP checking */
1286         __le64  s_mmp_block;            /* Block for multi-mount protection */
1287         __le32  s_raid_stripe_width;    /* blocks on all data disks (N*stride)*/
1288         __u8    s_log_groups_per_flex;  /* FLEX_BG group size */
1289         __u8    s_checksum_type;        /* metadata checksum algorithm used */
1290         __u8    s_encryption_level;     /* versioning level for encryption */
1291         __u8    s_reserved_pad;         /* Padding to next 32bits */
1292         __le64  s_kbytes_written;       /* nr of lifetime kilobytes written */
1293         __le32  s_snapshot_inum;        /* Inode number of active snapshot */
1294         __le32  s_snapshot_id;          /* sequential ID of active snapshot */
1295         __le64  s_snapshot_r_blocks_count; /* reserved blocks for active
1296                                               snapshot's future use */
1297         __le32  s_snapshot_list;        /* inode number of the head of the
1298                                            on-disk snapshot list */
1299 #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count)
1300         __le32  s_error_count;          /* number of fs errors */
1301         __le32  s_first_error_time;     /* first time an error happened */
1302         __le32  s_first_error_ino;      /* inode involved in first error */
1303         __le64  s_first_error_block;    /* block involved of first error */
1304         __u8    s_first_error_func[32]; /* function where the error happened */
1305         __le32  s_first_error_line;     /* line number where error happened */
1306         __le32  s_last_error_time;      /* most recent time of an error */
1307         __le32  s_last_error_ino;       /* inode involved in last error */
1308         __le32  s_last_error_line;      /* line number where error happened */
1309         __le64  s_last_error_block;     /* block involved of last error */
1310         __u8    s_last_error_func[32];  /* function where the error happened */
1311 #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts)
1312         __u8    s_mount_opts[64];
1313         __le32  s_usr_quota_inum;       /* inode for tracking user quota */
1314         __le32  s_grp_quota_inum;       /* inode for tracking group quota */
1315         __le32  s_overhead_clusters;    /* overhead blocks/clusters in fs */
1316         __le32  s_backup_bgs[2];        /* groups with sparse_super2 SBs */
1317         __u8    s_encrypt_algos[4];     /* Encryption algorithms in use  */
1318         __u8    s_encrypt_pw_salt[16];  /* Salt used for string2key algorithm */
1319         __le32  s_lpf_ino;              /* Location of the lost+found inode */
1320         __le32  s_prj_quota_inum;       /* inode for tracking project quota */
1321         __le32  s_checksum_seed;        /* crc32c(uuid) if csum_seed set */
1322         __le32  s_reserved[98];         /* Padding to the end of the block */
1323         __le32  s_checksum;             /* crc32c(superblock) */
1324 };
1325 
1326 #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START)
1327 
1328 #ifdef __KERNEL__
1329 
1330 /*
1331  * run-time mount flags
1332  */
1333 #define EXT4_MF_MNTDIR_SAMPLED          0x0001
1334 #define EXT4_MF_FS_ABORTED              0x0002  /* Fatal error detected */
1335 #define EXT4_MF_TEST_DUMMY_ENCRYPTION   0x0004
1336 
1337 #ifdef CONFIG_EXT4_FS_ENCRYPTION
1338 #define DUMMY_ENCRYPTION_ENABLED(sbi) (unlikely((sbi)->s_mount_flags & \
1339                                                 EXT4_MF_TEST_DUMMY_ENCRYPTION))
1340 #else
1341 #define DUMMY_ENCRYPTION_ENABLED(sbi) (0)
1342 #endif
1343 
1344 /* Number of quota types we support */
1345 #define EXT4_MAXQUOTAS 3
1346 
1347 /*
1348  * fourth extended-fs super-block data in memory
1349  */
1350 struct ext4_sb_info {
1351         unsigned long s_desc_size;      /* Size of a group descriptor in bytes */
1352         unsigned long s_inodes_per_block;/* Number of inodes per block */
1353         unsigned long s_blocks_per_group;/* Number of blocks in a group */
1354         unsigned long s_clusters_per_group; /* Number of clusters in a group */
1355         unsigned long s_inodes_per_group;/* Number of inodes in a group */
1356         unsigned long s_itb_per_group;  /* Number of inode table blocks per group */
1357         unsigned long s_gdb_count;      /* Number of group descriptor blocks */
1358         unsigned long s_desc_per_block; /* Number of group descriptors per block */
1359         ext4_group_t s_groups_count;    /* Number of groups in the fs */
1360         ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */
1361         unsigned long s_overhead;  /* # of fs overhead clusters */
1362         unsigned int s_cluster_ratio;   /* Number of blocks per cluster */
1363         unsigned int s_cluster_bits;    /* log2 of s_cluster_ratio */
1364         loff_t s_bitmap_maxbytes;       /* max bytes for bitmap files */
1365         struct buffer_head * s_sbh;     /* Buffer containing the super block */
1366         struct ext4_super_block *s_es;  /* Pointer to the super block in the buffer */
1367         struct buffer_head **s_group_desc;
1368         unsigned int s_mount_opt;
1369         unsigned int s_mount_opt2;
1370         unsigned int s_mount_flags;
1371         unsigned int s_def_mount_opt;
1372         ext4_fsblk_t s_sb_block;
1373         atomic64_t s_resv_clusters;
1374         kuid_t s_resuid;
1375         kgid_t s_resgid;
1376         unsigned short s_mount_state;
1377         unsigned short s_pad;
1378         int s_addr_per_block_bits;
1379         int s_desc_per_block_bits;
1380         int s_inode_size;
1381         int s_first_ino;
1382         unsigned int s_inode_readahead_blks;
1383         unsigned int s_inode_goal;
1384         spinlock_t s_next_gen_lock;
1385         u32 s_next_generation;
1386         u32 s_hash_seed[4];
1387         int s_def_hash_version;
1388         int s_hash_unsigned;    /* 3 if hash should be signed, 0 if not */
1389         struct percpu_counter s_freeclusters_counter;
1390         struct percpu_counter s_freeinodes_counter;
1391         struct percpu_counter s_dirs_counter;
1392         struct percpu_counter s_dirtyclusters_counter;
1393         struct blockgroup_lock *s_blockgroup_lock;
1394         struct proc_dir_entry *s_proc;
1395         struct kobject s_kobj;
1396         struct completion s_kobj_unregister;
1397         struct super_block *s_sb;
1398 
1399         /* Journaling */
1400         struct journal_s *s_journal;
1401         struct list_head s_orphan;
1402         struct mutex s_orphan_lock;
1403         unsigned long s_resize_flags;           /* Flags indicating if there
1404                                                    is a resizer */
1405         unsigned long s_commit_interval;
1406         u32 s_max_batch_time;
1407         u32 s_min_batch_time;
1408         struct block_device *journal_bdev;
1409 #ifdef CONFIG_QUOTA
1410         char *s_qf_names[EXT4_MAXQUOTAS];       /* Names of quota files with journalled quota */
1411         int s_jquota_fmt;                       /* Format of quota to use */
1412 #endif
1413         unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */
1414         struct rb_root system_blks;
1415 
1416 #ifdef EXTENTS_STATS
1417         /* ext4 extents stats */
1418         unsigned long s_ext_min;
1419         unsigned long s_ext_max;
1420         unsigned long s_depth_max;
1421         spinlock_t s_ext_stats_lock;
1422         unsigned long s_ext_blocks;
1423         unsigned long s_ext_extents;
1424 #endif
1425 
1426         /* for buddy allocator */
1427         struct ext4_group_info ***s_group_info;
1428         struct inode *s_buddy_cache;
1429         spinlock_t s_md_lock;
1430         unsigned short *s_mb_offsets;
1431         unsigned int *s_mb_maxs;
1432         unsigned int s_group_info_size;
1433 
1434         /* tunables */
1435         unsigned long s_stripe;
1436         unsigned int s_mb_stream_request;
1437         unsigned int s_mb_max_to_scan;
1438         unsigned int s_mb_min_to_scan;
1439         unsigned int s_mb_stats;
1440         unsigned int s_mb_order2_reqs;
1441         unsigned int s_mb_group_prealloc;
1442         unsigned int s_max_dir_size_kb;
1443         /* where last allocation was done - for stream allocation */
1444         unsigned long s_mb_last_group;
1445         unsigned long s_mb_last_start;
1446 
1447         /* stats for buddy allocator */
1448         atomic_t s_bal_reqs;    /* number of reqs with len > 1 */
1449         atomic_t s_bal_success; /* we found long enough chunks */
1450         atomic_t s_bal_allocated;       /* in blocks */
1451         atomic_t s_bal_ex_scanned;      /* total extents scanned */
1452         atomic_t s_bal_goals;   /* goal hits */
1453         atomic_t s_bal_breaks;  /* too long searches */
1454         atomic_t s_bal_2orders; /* 2^order hits */
1455         spinlock_t s_bal_lock;
1456         unsigned long s_mb_buddies_generated;
1457         unsigned long long s_mb_generation_time;
1458         atomic_t s_mb_lost_chunks;
1459         atomic_t s_mb_preallocated;
1460         atomic_t s_mb_discarded;
1461         atomic_t s_lock_busy;
1462 
1463         /* locality groups */
1464         struct ext4_locality_group __percpu *s_locality_groups;
1465 
1466         /* for write statistics */
1467         unsigned long s_sectors_written_start;
1468         u64 s_kbytes_written;
1469 
1470         /* the size of zero-out chunk */
1471         unsigned int s_extent_max_zeroout_kb;
1472 
1473         unsigned int s_log_groups_per_flex;
1474         struct flex_groups *s_flex_groups;
1475         ext4_group_t s_flex_groups_allocated;
1476 
1477         /* workqueue for reserved extent conversions (buffered io) */
1478         struct workqueue_struct *rsv_conversion_wq;
1479 
1480         /* timer for periodic error stats printing */
1481         struct timer_list s_err_report;
1482 
1483         /* Lazy inode table initialization info */
1484         struct ext4_li_request *s_li_request;
1485         /* Wait multiplier for lazy initialization thread */
1486         unsigned int s_li_wait_mult;
1487 
1488         /* Kernel thread for multiple mount protection */
1489         struct task_struct *s_mmp_tsk;
1490 
1491         /* record the last minlen when FITRIM is called. */
1492         atomic_t s_last_trim_minblks;
1493 
1494         /* Reference to checksum algorithm driver via cryptoapi */
1495         struct crypto_shash *s_chksum_driver;
1496 
1497         /* Precomputed FS UUID checksum for seeding other checksums */
1498         __u32 s_csum_seed;
1499 
1500         /* Reclaim extents from extent status tree */
1501         struct shrinker s_es_shrinker;
1502         struct list_head s_es_list;     /* List of inodes with reclaimable extents */
1503         long s_es_nr_inode;
1504         struct ext4_es_stats s_es_stats;
1505         struct mb_cache *s_mb_cache;
1506         spinlock_t s_es_lock ____cacheline_aligned_in_smp;
1507 
1508         /* Ratelimit ext4 messages. */
1509         struct ratelimit_state s_err_ratelimit_state;
1510         struct ratelimit_state s_warning_ratelimit_state;
1511         struct ratelimit_state s_msg_ratelimit_state;
1512 
1513         /* Barrier between changing inodes' journal flags and writepages ops. */
1514         struct percpu_rw_semaphore s_journal_flag_rwsem;
1515 };
1516 
1517 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb)
1518 {
1519         return sb->s_fs_info;
1520 }
1521 static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
1522 {
1523         return container_of(inode, struct ext4_inode_info, vfs_inode);
1524 }
1525 
1526 static inline struct timespec ext4_current_time(struct inode *inode)
1527 {
1528         return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ?
1529                 current_fs_time(inode->i_sb) : CURRENT_TIME_SEC;
1530 }
1531 
1532 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
1533 {
1534         return ino == EXT4_ROOT_INO ||
1535                 ino == EXT4_USR_QUOTA_INO ||
1536                 ino == EXT4_GRP_QUOTA_INO ||
1537                 ino == EXT4_BOOT_LOADER_INO ||
1538                 ino == EXT4_JOURNAL_INO ||
1539                 ino == EXT4_RESIZE_INO ||
1540                 (ino >= EXT4_FIRST_INO(sb) &&
1541                  ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
1542 }
1543 
1544 /*
1545  * Inode dynamic state flags
1546  */
1547 enum {
1548         EXT4_STATE_JDATA,               /* journaled data exists */
1549         EXT4_STATE_NEW,                 /* inode is newly created */
1550         EXT4_STATE_XATTR,               /* has in-inode xattrs */
1551         EXT4_STATE_NO_EXPAND,           /* No space for expansion */
1552         EXT4_STATE_DA_ALLOC_CLOSE,      /* Alloc DA blks on close */
1553         EXT4_STATE_EXT_MIGRATE,         /* Inode is migrating */
1554         EXT4_STATE_DIO_UNWRITTEN,       /* need convert on dio done*/
1555         EXT4_STATE_NEWENTRY,            /* File just added to dir */
1556         EXT4_STATE_DIOREAD_LOCK,        /* Disable support for dio read
1557                                            nolocking */
1558         EXT4_STATE_MAY_INLINE_DATA,     /* may have in-inode data */
1559         EXT4_STATE_EXT_PRECACHED,       /* extents have been precached */
1560 };
1561 
1562 #define EXT4_INODE_BIT_FNS(name, field, offset)                         \
1563 static inline int ext4_test_inode_##name(struct inode *inode, int bit)  \
1564 {                                                                       \
1565         return test_bit(bit + (offset), &EXT4_I(inode)->i_##field);     \
1566 }                                                                       \
1567 static inline void ext4_set_inode_##name(struct inode *inode, int bit)  \
1568 {                                                                       \
1569         set_bit(bit + (offset), &EXT4_I(inode)->i_##field);             \
1570 }                                                                       \
1571 static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \
1572 {                                                                       \
1573         clear_bit(bit + (offset), &EXT4_I(inode)->i_##field);           \
1574 }
1575 
1576 /* Add these declarations here only so that these functions can be
1577  * found by name.  Otherwise, they are very hard to locate. */
1578 static inline int ext4_test_inode_flag(struct inode *inode, int bit);
1579 static inline void ext4_set_inode_flag(struct inode *inode, int bit);
1580 static inline void ext4_clear_inode_flag(struct inode *inode, int bit);
1581 EXT4_INODE_BIT_FNS(flag, flags, 0)
1582 
1583 /* Add these declarations here only so that these functions can be
1584  * found by name.  Otherwise, they are very hard to locate. */
1585 static inline int ext4_test_inode_state(struct inode *inode, int bit);
1586 static inline void ext4_set_inode_state(struct inode *inode, int bit);
1587 static inline void ext4_clear_inode_state(struct inode *inode, int bit);
1588 #if (BITS_PER_LONG < 64)
1589 EXT4_INODE_BIT_FNS(state, state_flags, 0)
1590 
1591 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1592 {
1593         (ei)->i_state_flags = 0;
1594 }
1595 #else
1596 EXT4_INODE_BIT_FNS(state, flags, 32)
1597 
1598 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1599 {
1600         /* We depend on the fact that callers will set i_flags */
1601 }
1602 #endif
1603 #else
1604 /* Assume that user mode programs are passing in an ext4fs superblock, not
1605  * a kernel struct super_block.  This will allow us to call the feature-test
1606  * macros from user land. */
1607 #define EXT4_SB(sb)     (sb)
1608 #endif
1609 
1610 /*
1611  * Returns true if the inode is inode is encrypted
1612  */
1613 static inline int ext4_encrypted_inode(struct inode *inode)
1614 {
1615 #ifdef CONFIG_EXT4_FS_ENCRYPTION
1616         return ext4_test_inode_flag(inode, EXT4_INODE_ENCRYPT);
1617 #else
1618         return 0;
1619 #endif
1620 }
1621 
1622 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
1623 
1624 /*
1625  * Codes for operating systems
1626  */
1627 #define EXT4_OS_LINUX           0
1628 #define EXT4_OS_HURD            1
1629 #define EXT4_OS_MASIX           2
1630 #define EXT4_OS_FREEBSD         3
1631 #define EXT4_OS_LITES           4
1632 
1633 /*
1634  * Revision levels
1635  */
1636 #define EXT4_GOOD_OLD_REV       0       /* The good old (original) format */
1637 #define EXT4_DYNAMIC_REV        1       /* V2 format w/ dynamic inode sizes */
1638 
1639 #define EXT4_CURRENT_REV        EXT4_GOOD_OLD_REV
1640 #define EXT4_MAX_SUPP_REV       EXT4_DYNAMIC_REV
1641 
1642 #define EXT4_GOOD_OLD_INODE_SIZE 128
1643 
1644 /*
1645  * Feature set definitions
1646  */
1647 
1648 /* Use the ext4_{has,set,clear}_feature_* helpers; these will be removed */
1649 #define EXT4_HAS_COMPAT_FEATURE(sb,mask)                        \
1650         ((EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask)) != 0)
1651 #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask)                     \
1652         ((EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask)) != 0)
1653 #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask)                      \
1654         ((EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask)) != 0)
1655 #define EXT4_SET_COMPAT_FEATURE(sb,mask)                        \
1656         EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
1657 #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask)                     \
1658         EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
1659 #define EXT4_SET_INCOMPAT_FEATURE(sb,mask)                      \
1660         EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
1661 #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask)                      \
1662         EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
1663 #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask)                   \
1664         EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
1665 #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask)                    \
1666         EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
1667 
1668 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC        0x0001
1669 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES       0x0002
1670 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL         0x0004
1671 #define EXT4_FEATURE_COMPAT_EXT_ATTR            0x0008
1672 #define EXT4_FEATURE_COMPAT_RESIZE_INODE        0x0010
1673 #define EXT4_FEATURE_COMPAT_DIR_INDEX           0x0020
1674 #define EXT4_FEATURE_COMPAT_SPARSE_SUPER2       0x0200
1675 
1676 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER     0x0001
1677 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE       0x0002
1678 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR        0x0004
1679 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE        0x0008
1680 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM         0x0010
1681 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK        0x0020
1682 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE      0x0040
1683 #define EXT4_FEATURE_RO_COMPAT_QUOTA            0x0100
1684 #define EXT4_FEATURE_RO_COMPAT_BIGALLOC         0x0200
1685 /*
1686  * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM).  When
1687  * METADATA_CSUM is set, group descriptor checksums use the same algorithm as
1688  * all other data structures' checksums.  However, the METADATA_CSUM and
1689  * GDT_CSUM bits are mutually exclusive.
1690  */
1691 #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM    0x0400
1692 #define EXT4_FEATURE_RO_COMPAT_READONLY         0x1000
1693 #define EXT4_FEATURE_RO_COMPAT_PROJECT          0x2000
1694 
1695 #define EXT4_FEATURE_INCOMPAT_COMPRESSION       0x0001
1696 #define EXT4_FEATURE_INCOMPAT_FILETYPE          0x0002
1697 #define EXT4_FEATURE_INCOMPAT_RECOVER           0x0004 /* Needs recovery */
1698 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV       0x0008 /* Journal device */
1699 #define EXT4_FEATURE_INCOMPAT_META_BG           0x0010
1700 #define EXT4_FEATURE_INCOMPAT_EXTENTS           0x0040 /* extents support */
1701 #define EXT4_FEATURE_INCOMPAT_64BIT             0x0080
1702 #define EXT4_FEATURE_INCOMPAT_MMP               0x0100
1703 #define EXT4_FEATURE_INCOMPAT_FLEX_BG           0x0200
1704 #define EXT4_FEATURE_INCOMPAT_EA_INODE          0x0400 /* EA in inode */
1705 #define EXT4_FEATURE_INCOMPAT_DIRDATA           0x1000 /* data in dirent */
1706 #define EXT4_FEATURE_INCOMPAT_CSUM_SEED         0x2000
1707 #define EXT4_FEATURE_INCOMPAT_LARGEDIR          0x4000 /* >2GB or 3-lvl htree */
1708 #define EXT4_FEATURE_INCOMPAT_INLINE_DATA       0x8000 /* data in inode */
1709 #define EXT4_FEATURE_INCOMPAT_ENCRYPT           0x10000
1710 
1711 #define EXT4_FEATURE_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_compat & \
1715                 cpu_to_le32(EXT4_FEATURE_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_compat |= \
1720                 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \
1721 } \
1722 static inline void ext4_clear_feature_##name(struct super_block *sb) \
1723 { \
1724         EXT4_SB(sb)->s_es->s_feature_compat &= \
1725                 ~cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \
1726 }
1727 
1728 #define EXT4_FEATURE_RO_COMPAT_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_ro_compat & \
1732                 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname)) != 0); \
1733 } \
1734 static inline void ext4_set_feature_##name(struct super_block *sb) \
1735 { \
1736         EXT4_SB(sb)->s_es->s_feature_ro_compat |= \
1737                 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \
1738 } \
1739 static inline void ext4_clear_feature_##name(struct super_block *sb) \
1740 { \
1741         EXT4_SB(sb)->s_es->s_feature_ro_compat &= \
1742                 ~cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \
1743 }
1744 
1745 #define EXT4_FEATURE_INCOMPAT_FUNCS(name, flagname) \
1746 static inline bool ext4_has_feature_##name(struct super_block *sb) \
1747 { \
1748         return ((EXT4_SB(sb)->s_es->s_feature_incompat & \
1749                 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname)) != 0); \
1750 } \
1751 static inline void ext4_set_feature_##name(struct super_block *sb) \
1752 { \
1753         EXT4_SB(sb)->s_es->s_feature_incompat |= \
1754                 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \
1755 } \
1756 static inline void ext4_clear_feature_##name(struct super_block *sb) \
1757 { \
1758         EXT4_SB(sb)->s_es->s_feature_incompat &= \
1759                 ~cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \
1760 }
1761 
1762 EXT4_FEATURE_COMPAT_FUNCS(dir_prealloc,         DIR_PREALLOC)
1763 EXT4_FEATURE_COMPAT_FUNCS(imagic_inodes,        IMAGIC_INODES)
1764 EXT4_FEATURE_COMPAT_FUNCS(journal,              HAS_JOURNAL)
1765 EXT4_FEATURE_COMPAT_FUNCS(xattr,                EXT_ATTR)
1766 EXT4_FEATURE_COMPAT_FUNCS(resize_inode,         RESIZE_INODE)
1767 EXT4_FEATURE_COMPAT_FUNCS(dir_index,            DIR_INDEX)
1768 EXT4_FEATURE_COMPAT_FUNCS(sparse_super2,        SPARSE_SUPER2)
1769 
1770 EXT4_FEATURE_RO_COMPAT_FUNCS(sparse_super,      SPARSE_SUPER)
1771 EXT4_FEATURE_RO_COMPAT_FUNCS(large_file,        LARGE_FILE)
1772 EXT4_FEATURE_RO_COMPAT_FUNCS(btree_dir,         BTREE_DIR)
1773 EXT4_FEATURE_RO_COMPAT_FUNCS(huge_file,         HUGE_FILE)
1774 EXT4_FEATURE_RO_COMPAT_FUNCS(gdt_csum,          GDT_CSUM)
1775 EXT4_FEATURE_RO_COMPAT_FUNCS(dir_nlink,         DIR_NLINK)
1776 EXT4_FEATURE_RO_COMPAT_FUNCS(extra_isize,       EXTRA_ISIZE)
1777 EXT4_FEATURE_RO_COMPAT_FUNCS(quota,             QUOTA)
1778 EXT4_FEATURE_RO_COMPAT_FUNCS(bigalloc,          BIGALLOC)
1779 EXT4_FEATURE_RO_COMPAT_FUNCS(metadata_csum,     METADATA_CSUM)
1780 EXT4_FEATURE_RO_COMPAT_FUNCS(readonly,          READONLY)
1781 EXT4_FEATURE_RO_COMPAT_FUNCS(project,           PROJECT)
1782 
1783 EXT4_FEATURE_INCOMPAT_FUNCS(compression,        COMPRESSION)
1784 EXT4_FEATURE_INCOMPAT_FUNCS(filetype,           FILETYPE)
1785 EXT4_FEATURE_INCOMPAT_FUNCS(journal_needs_recovery,     RECOVER)
1786 EXT4_FEATURE_INCOMPAT_FUNCS(journal_dev,        JOURNAL_DEV)
1787 EXT4_FEATURE_INCOMPAT_FUNCS(meta_bg,            META_BG)
1788 EXT4_FEATURE_INCOMPAT_FUNCS(extents,            EXTENTS)
1789 EXT4_FEATURE_INCOMPAT_FUNCS(64bit,              64BIT)
1790 EXT4_FEATURE_INCOMPAT_FUNCS(mmp,                MMP)
1791 EXT4_FEATURE_INCOMPAT_FUNCS(flex_bg,            FLEX_BG)
1792 EXT4_FEATURE_INCOMPAT_FUNCS(ea_inode,           EA_INODE)
1793 EXT4_FEATURE_INCOMPAT_FUNCS(dirdata,            DIRDATA)
1794 EXT4_FEATURE_INCOMPAT_FUNCS(csum_seed,          CSUM_SEED)
1795 EXT4_FEATURE_INCOMPAT_FUNCS(largedir,           LARGEDIR)
1796 EXT4_FEATURE_INCOMPAT_FUNCS(inline_data,        INLINE_DATA)
1797 EXT4_FEATURE_INCOMPAT_FUNCS(encrypt,            ENCRYPT)
1798 
1799 #define EXT2_FEATURE_COMPAT_SUPP        EXT4_FEATURE_COMPAT_EXT_ATTR
1800 #define EXT2_FEATURE_INCOMPAT_SUPP      (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1801                                          EXT4_FEATURE_INCOMPAT_META_BG)
1802 #define EXT2_FEATURE_RO_COMPAT_SUPP     (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1803                                          EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1804                                          EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
1805 
1806 #define EXT3_FEATURE_COMPAT_SUPP        EXT4_FEATURE_COMPAT_EXT_ATTR
1807 #define EXT3_FEATURE_INCOMPAT_SUPP      (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1808                                          EXT4_FEATURE_INCOMPAT_RECOVER| \
1809                                          EXT4_FEATURE_INCOMPAT_META_BG)
1810 #define EXT3_FEATURE_RO_COMPAT_SUPP     (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1811                                          EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1812                                          EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
1813 
1814 #define EXT4_FEATURE_COMPAT_SUPP        EXT4_FEATURE_COMPAT_EXT_ATTR
1815 #define EXT4_FEATURE_INCOMPAT_SUPP      (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1816                                          EXT4_FEATURE_INCOMPAT_RECOVER| \
1817                                          EXT4_FEATURE_INCOMPAT_META_BG| \
1818                                          EXT4_FEATURE_INCOMPAT_EXTENTS| \
1819                                          EXT4_FEATURE_INCOMPAT_64BIT| \
1820                                          EXT4_FEATURE_INCOMPAT_FLEX_BG| \
1821                                          EXT4_FEATURE_INCOMPAT_MMP | \
1822                                          EXT4_FEATURE_INCOMPAT_INLINE_DATA | \
1823                                          EXT4_FEATURE_INCOMPAT_ENCRYPT | \
1824                                          EXT4_FEATURE_INCOMPAT_CSUM_SEED)
1825 #define EXT4_FEATURE_RO_COMPAT_SUPP     (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1826                                          EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1827                                          EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
1828                                          EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
1829                                          EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
1830                                          EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
1831                                          EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\
1832                                          EXT4_FEATURE_RO_COMPAT_BIGALLOC |\
1833                                          EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\
1834                                          EXT4_FEATURE_RO_COMPAT_QUOTA |\
1835                                          EXT4_FEATURE_RO_COMPAT_PROJECT)
1836 
1837 #define EXTN_FEATURE_FUNCS(ver) \
1838 static inline bool ext4_has_unknown_ext##ver##_compat_features(struct super_block *sb) \
1839 { \
1840         return ((EXT4_SB(sb)->s_es->s_feature_compat & \
1841                 cpu_to_le32(~EXT##ver##_FEATURE_COMPAT_SUPP)) != 0); \
1842 } \
1843 static inline bool ext4_has_unknown_ext##ver##_ro_compat_features(struct super_block *sb) \
1844 { \
1845         return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \
1846                 cpu_to_le32(~EXT##ver##_FEATURE_RO_COMPAT_SUPP)) != 0); \
1847 } \
1848 static inline bool ext4_has_unknown_ext##ver##_incompat_features(struct super_block *sb) \
1849 { \
1850         return ((EXT4_SB(sb)->s_es->s_feature_incompat & \
1851                 cpu_to_le32(~EXT##ver##_FEATURE_INCOMPAT_SUPP)) != 0); \
1852 }
1853 
1854 EXTN_FEATURE_FUNCS(2)
1855 EXTN_FEATURE_FUNCS(3)
1856 EXTN_FEATURE_FUNCS(4)
1857 
1858 static inline bool ext4_has_compat_features(struct super_block *sb)
1859 {
1860         return (EXT4_SB(sb)->s_es->s_feature_compat != 0);
1861 }
1862 static inline bool ext4_has_ro_compat_features(struct super_block *sb)
1863 {
1864         return (EXT4_SB(sb)->s_es->s_feature_ro_compat != 0);
1865 }
1866 static inline bool ext4_has_incompat_features(struct super_block *sb)
1867 {
1868         return (EXT4_SB(sb)->s_es->s_feature_incompat != 0);
1869 }
1870 
1871 /*
1872  * Default values for user and/or group using reserved blocks
1873  */
1874 #define EXT4_DEF_RESUID         0
1875 #define EXT4_DEF_RESGID         0
1876 
1877 /*
1878  * Default project ID
1879  */
1880 #define EXT4_DEF_PROJID         0
1881 
1882 #define EXT4_DEF_INODE_READAHEAD_BLKS   32
1883 
1884 /*
1885  * Default mount options
1886  */
1887 #define EXT4_DEFM_DEBUG         0x0001
1888 #define EXT4_DEFM_BSDGROUPS     0x0002
1889 #define EXT4_DEFM_XATTR_USER    0x0004
1890 #define EXT4_DEFM_ACL           0x0008
1891 #define EXT4_DEFM_UID16         0x0010
1892 #define EXT4_DEFM_JMODE         0x0060
1893 #define EXT4_DEFM_JMODE_DATA    0x0020
1894 #define EXT4_DEFM_JMODE_ORDERED 0x0040
1895 #define EXT4_DEFM_JMODE_WBACK   0x0060
1896 #define EXT4_DEFM_NOBARRIER     0x0100
1897 #define EXT4_DEFM_BLOCK_VALIDITY 0x0200
1898 #define EXT4_DEFM_DISCARD       0x0400
1899 #define EXT4_DEFM_NODELALLOC    0x0800
1900 
1901 /*
1902  * Default journal batch times
1903  */
1904 #define EXT4_DEF_MIN_BATCH_TIME 0
1905 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */
1906 
1907 /*
1908  * Minimum number of groups in a flexgroup before we separate out
1909  * directories into the first block group of a flexgroup
1910  */
1911 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4
1912 
1913 /*
1914  * Structure of a directory entry
1915  */
1916 #define EXT4_NAME_LEN 255
1917 
1918 struct ext4_dir_entry {
1919         __le32  inode;                  /* Inode number */
1920         __le16  rec_len;                /* Directory entry length */
1921         __le16  name_len;               /* Name length */
1922         char    name[EXT4_NAME_LEN];    /* File name */
1923 };
1924 
1925 /*
1926  * The new version of the directory entry.  Since EXT4 structures are
1927  * stored in intel byte order, and the name_len field could never be
1928  * bigger than 255 chars, it's safe to reclaim the extra byte for the
1929  * file_type field.
1930  */
1931 struct ext4_dir_entry_2 {
1932         __le32  inode;                  /* Inode number */
1933         __le16  rec_len;                /* Directory entry length */
1934         __u8    name_len;               /* Name length */
1935         __u8    file_type;
1936         char    name[EXT4_NAME_LEN];    /* File name */
1937 };
1938 
1939 /*
1940  * This is a bogus directory entry at the end of each leaf block that
1941  * records checksums.
1942  */
1943 struct ext4_dir_entry_tail {
1944         __le32  det_reserved_zero1;     /* Pretend to be unused */
1945         __le16  det_rec_len;            /* 12 */
1946         __u8    det_reserved_zero2;     /* Zero name length */
1947         __u8    det_reserved_ft;        /* 0xDE, fake file type */
1948         __le32  det_checksum;           /* crc32c(uuid+inum+dirblock) */
1949 };
1950 
1951 #define EXT4_DIRENT_TAIL(block, blocksize) \
1952         ((struct ext4_dir_entry_tail *)(((void *)(block)) + \
1953                                         ((blocksize) - \
1954                                          sizeof(struct ext4_dir_entry_tail))))
1955 
1956 /*
1957  * Ext4 directory file types.  Only the low 3 bits are used.  The
1958  * other bits are reserved for now.
1959  */
1960 #define EXT4_FT_UNKNOWN         0
1961 #define EXT4_FT_REG_FILE        1
1962 #define EXT4_FT_DIR             2
1963 #define EXT4_FT_CHRDEV          3
1964 #define EXT4_FT_BLKDEV          4
1965 #define EXT4_FT_FIFO            5
1966 #define EXT4_FT_SOCK            6
1967 #define EXT4_FT_SYMLINK         7
1968 
1969 #define EXT4_FT_MAX             8
1970 
1971 #define EXT4_FT_DIR_CSUM        0xDE
1972 
1973 /*
1974  * EXT4_DIR_PAD defines the directory entries boundaries
1975  *
1976  * NOTE: It must be a multiple of 4
1977  */
1978 #define EXT4_DIR_PAD                    4
1979 #define EXT4_DIR_ROUND                  (EXT4_DIR_PAD - 1)
1980 #define EXT4_DIR_REC_LEN(name_len)      (((name_len) + 8 + EXT4_DIR_ROUND) & \
1981                                          ~EXT4_DIR_ROUND)
1982 #define EXT4_MAX_REC_LEN                ((1<<16)-1)
1983 
1984 /*
1985  * If we ever get support for fs block sizes > page_size, we'll need
1986  * to remove the #if statements in the next two functions...
1987  */
1988 static inline unsigned int
1989 ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize)
1990 {
1991         unsigned len = le16_to_cpu(dlen);
1992 
1993 #if (PAGE_SIZE >= 65536)
1994         if (len == EXT4_MAX_REC_LEN || len == 0)
1995                 return blocksize;
1996         return (len & 65532) | ((len & 3) << 16);
1997 #else
1998         return len;
1999 #endif
2000 }
2001 
2002 static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize)
2003 {
2004         if ((len > blocksize) || (blocksize > (1 << 18)) || (len & 3))
2005                 BUG();
2006 #if (PAGE_SIZE >= 65536)
2007         if (len < 65536)
2008                 return cpu_to_le16(len);
2009         if (len == blocksize) {
2010                 if (blocksize == 65536)
2011                         return cpu_to_le16(EXT4_MAX_REC_LEN);
2012                 else
2013                         return cpu_to_le16(0);
2014         }
2015         return cpu_to_le16((len & 65532) | ((len >> 16) & 3));
2016 #else
2017         return cpu_to_le16(len);
2018 #endif
2019 }
2020 
2021 /*
2022  * Hash Tree Directory indexing
2023  * (c) Daniel Phillips, 2001
2024  */
2025 
2026 #define is_dx(dir) (ext4_has_feature_dir_index((dir)->i_sb) && \
2027                     ext4_test_inode_flag((dir), EXT4_INODE_INDEX))
2028 #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX)
2029 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
2030 
2031 /* Legal values for the dx_root hash_version field: */
2032 
2033 #define DX_HASH_LEGACY          0
2034 #define DX_HASH_HALF_MD4        1
2035 #define DX_HASH_TEA             2
2036 #define DX_HASH_LEGACY_UNSIGNED 3
2037 #define DX_HASH_HALF_MD4_UNSIGNED       4
2038 #define DX_HASH_TEA_UNSIGNED            5
2039 
2040 static inline u32 ext4_chksum(struct ext4_sb_info *sbi, u32 crc,
2041                               const void *address, unsigned int length)
2042 {
2043         struct {
2044                 struct shash_desc shash;
2045                 char ctx[4];
2046         } desc;
2047         int err;
2048 
2049         BUG_ON(crypto_shash_descsize(sbi->s_chksum_driver)!=sizeof(desc.ctx));
2050 
2051         desc.shash.tfm = sbi->s_chksum_driver;
2052         desc.shash.flags = 0;
2053         *(u32 *)desc.ctx = crc;
2054 
2055         err = crypto_shash_update(&desc.shash, address, length);
2056         BUG_ON(err);
2057 
2058         return *(u32 *)desc.ctx;
2059 }
2060 
2061 #ifdef __KERNEL__
2062 
2063 /* hash info structure used by the directory hash */
2064 struct dx_hash_info
2065 {
2066         u32             hash;
2067         u32             minor_hash;
2068         int             hash_version;
2069         u32             *seed;
2070 };
2071 
2072 
2073 /* 32 and 64 bit signed EOF for dx directories */
2074 #define EXT4_HTREE_EOF_32BIT   ((1UL  << (32 - 1)) - 1)
2075 #define EXT4_HTREE_EOF_64BIT   ((1ULL << (64 - 1)) - 1)
2076 
2077 
2078 /*
2079  * Control parameters used by ext4_htree_next_block
2080  */
2081 #define HASH_NB_ALWAYS          1
2082 
2083 struct ext4_filename {
2084         const struct qstr *usr_fname;
2085         struct ext4_str disk_name;
2086         struct dx_hash_info hinfo;
2087 #ifdef CONFIG_EXT4_FS_ENCRYPTION
2088         struct ext4_str crypto_buf;
2089 #endif
2090 };
2091 
2092 #define fname_name(p) ((p)->disk_name.name)
2093 #define fname_len(p)  ((p)->disk_name.len)
2094 
2095 /*
2096  * Describe an inode's exact location on disk and in memory
2097  */
2098 struct ext4_iloc
2099 {
2100         struct buffer_head *bh;
2101         unsigned long offset;
2102         ext4_group_t block_group;
2103 };
2104 
2105 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
2106 {
2107         return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
2108 }
2109 
2110 /*
2111  * This structure is stuffed into the struct file's private_data field
2112  * for directories.  It is where we put information so that we can do
2113  * readdir operations in hash tree order.
2114  */
2115 struct dir_private_info {
2116         struct rb_root  root;
2117         struct rb_node  *curr_node;
2118         struct fname    *extra_fname;
2119         loff_t          last_pos;
2120         __u32           curr_hash;
2121         __u32           curr_minor_hash;
2122         __u32           next_hash;
2123 };
2124 
2125 /* calculate the first block number of the group */
2126 static inline ext4_fsblk_t
2127 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no)
2128 {
2129         return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
2130                 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
2131 }
2132 
2133 /*
2134  * Special error return code only used by dx_probe() and its callers.
2135  */
2136 #define ERR_BAD_DX_DIR  (-(MAX_ERRNO - 1))
2137 
2138 /*
2139  * Timeout and state flag for lazy initialization inode thread.
2140  */
2141 #define EXT4_DEF_LI_WAIT_MULT                   10
2142 #define EXT4_DEF_LI_MAX_START_DELAY             5
2143 #define EXT4_LAZYINIT_QUIT                      0x0001
2144 #define EXT4_LAZYINIT_RUNNING                   0x0002
2145 
2146 /*
2147  * Lazy inode table initialization info
2148  */
2149 struct ext4_lazy_init {
2150         unsigned long           li_state;
2151         struct list_head        li_request_list;
2152         struct mutex            li_list_mtx;
2153 };
2154 
2155 struct ext4_li_request {
2156         struct super_block      *lr_super;
2157         struct ext4_sb_info     *lr_sbi;
2158         ext4_group_t            lr_next_group;
2159         struct list_head        lr_request;
2160         unsigned long           lr_next_sched;
2161         unsigned long           lr_timeout;
2162 };
2163 
2164 struct ext4_features {
2165         struct kobject f_kobj;
2166         struct completion f_kobj_unregister;
2167 };
2168 
2169 /*
2170  * This structure will be used for multiple mount protection. It will be
2171  * written into the block number saved in the s_mmp_block field in the
2172  * superblock. Programs that check MMP should assume that if
2173  * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe
2174  * to use the filesystem, regardless of how old the timestamp is.
2175  */
2176 #define EXT4_MMP_MAGIC     0x004D4D50U /* ASCII for MMP */
2177 #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */
2178 #define EXT4_MMP_SEQ_FSCK  0xE24D4D50U /* mmp_seq value when being fscked */
2179 #define EXT4_MMP_SEQ_MAX   0xE24D4D4FU /* maximum valid mmp_seq value */
2180 
2181 struct mmp_struct {
2182         __le32  mmp_magic;              /* Magic number for MMP */
2183         __le32  mmp_seq;                /* Sequence no. updated periodically */
2184 
2185         /*
2186          * mmp_time, mmp_nodename & mmp_bdevname are only used for information
2187          * purposes and do not affect the correctness of the algorithm
2188          */
2189         __le64  mmp_time;               /* Time last updated */
2190         char    mmp_nodename[64];       /* Node which last updated MMP block */
2191         char    mmp_bdevname[32];       /* Bdev which last updated MMP block */
2192 
2193         /*
2194          * mmp_check_interval is used to verify if the MMP block has been
2195          * updated on the block device. The value is updated based on the
2196          * maximum time to write the MMP block during an update cycle.
2197          */
2198         __le16  mmp_check_interval;
2199 
2200         __le16  mmp_pad1;
2201         __le32  mmp_pad2[226];
2202         __le32  mmp_checksum;           /* crc32c(uuid+mmp_block) */
2203 };
2204 
2205 /* arguments passed to the mmp thread */
2206 struct mmpd_data {
2207         struct buffer_head *bh; /* bh from initial read_mmp_block() */
2208         struct super_block *sb;  /* super block of the fs */
2209 };
2210 
2211 /*
2212  * Check interval multiplier
2213  * The MMP block is written every update interval and initially checked every
2214  * update interval x the multiplier (the value is then adapted based on the
2215  * write latency). The reason is that writes can be delayed under load and we
2216  * don't want readers to incorrectly assume that the filesystem is no longer
2217  * in use.
2218  */
2219 #define EXT4_MMP_CHECK_MULT             2UL
2220 
2221 /*
2222  * Minimum interval for MMP checking in seconds.
2223  */
2224 #define EXT4_MMP_MIN_CHECK_INTERVAL     5UL
2225 
2226 /*
2227  * Maximum interval for MMP checking in seconds.
2228  */
2229 #define EXT4_MMP_MAX_CHECK_INTERVAL     300UL
2230 
2231 /*
2232  * Function prototypes
2233  */
2234 
2235 /*
2236  * Ok, these declarations are also in <linux/kernel.h> but none of the
2237  * ext4 source programs needs to include it so they are duplicated here.
2238  */
2239 # define NORET_TYPE     /**/
2240 # define ATTRIB_NORET   __attribute__((noreturn))
2241 # define NORET_AND      noreturn,
2242 
2243 /* bitmap.c */
2244 extern unsigned int ext4_count_free(char *bitmap, unsigned numchars);
2245 void ext4_inode_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
2246                                 struct ext4_group_desc *gdp,
2247                                 struct buffer_head *bh, int sz);
2248 int ext4_inode_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
2249                                   struct ext4_group_desc *gdp,
2250                                   struct buffer_head *bh, int sz);
2251 void ext4_block_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
2252                                 struct ext4_group_desc *gdp,
2253                                 struct buffer_head *bh);
2254 int ext4_block_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
2255                                   struct ext4_group_desc *gdp,
2256                                   struct buffer_head *bh);
2257 
2258 /* balloc.c */
2259 extern void ext4_get_group_no_and_offset(struct super_block *sb,
2260                                          ext4_fsblk_t blocknr,
2261                                          ext4_group_t *blockgrpp,
2262                                          ext4_grpblk_t *offsetp);
2263 extern ext4_group_t ext4_get_group_number(struct super_block *sb,
2264                                           ext4_fsblk_t block);
2265 
2266 extern unsigned int ext4_block_group(struct super_block *sb,
2267                         ext4_fsblk_t blocknr);
2268 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb,
2269                         ext4_fsblk_t blocknr);
2270 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group);
2271 extern unsigned long ext4_bg_num_gdb(struct super_block *sb,
2272                         ext4_group_t group);
2273 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,
2274                                          ext4_fsblk_t goal,
2275                                          unsigned int flags,
2276                                          unsigned long *count,
2277                                          int *errp);
2278 extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi,
2279                                     s64 nclusters, unsigned int flags);
2280 extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *);
2281 extern void ext4_check_blocks_bitmap(struct super_block *);
2282 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
2283                                                     ext4_group_t block_group,
2284                                                     struct buffer_head ** bh);
2285 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
2286 
2287 extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb,
2288                                                 ext4_group_t block_group);
2289 extern int ext4_wait_block_bitmap(struct super_block *sb,
2290                                   ext4_group_t block_group,
2291                                   struct buffer_head *bh);
2292 extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb,
2293                                                   ext4_group_t block_group);
2294 extern unsigned ext4_free_clusters_after_init(struct super_block *sb,
2295                                               ext4_group_t block_group,
2296                                               struct ext4_group_desc *gdp);
2297 ext4_fsblk_t ext4_inode_to_goal_block(struct inode *);
2298 
2299 /* crypto_policy.c */
2300 int ext4_is_child_context_consistent_with_parent(struct inode *parent,
2301                                                  struct inode *child);
2302 int ext4_inherit_context(struct inode *parent, struct inode *child);
2303 void ext4_to_hex(char *dst, char *src, size_t src_size);
2304 int ext4_process_policy(const struct ext4_encryption_policy *policy,
2305                         struct inode *inode);
2306 int ext4_get_policy(struct inode *inode,
2307                     struct ext4_encryption_policy *policy);
2308 
2309 /* crypto.c */
2310 extern struct kmem_cache *ext4_crypt_info_cachep;
2311 bool ext4_valid_contents_enc_mode(uint32_t mode);
2312 uint32_t ext4_validate_encryption_key_size(uint32_t mode, uint32_t size);
2313 extern struct workqueue_struct *ext4_read_workqueue;
2314 struct ext4_crypto_ctx *ext4_get_crypto_ctx(struct inode *inode,
2315                                             gfp_t gfp_flags);
2316 void ext4_release_crypto_ctx(struct ext4_crypto_ctx *ctx);
2317 void ext4_restore_control_page(struct page *data_page);
2318 struct page *ext4_encrypt(struct inode *inode,
2319                           struct page *plaintext_page,
2320                           gfp_t gfp_flags);
2321 int ext4_decrypt(struct page *page);
2322 int ext4_encrypted_zeroout(struct inode *inode, ext4_lblk_t lblk,
2323                            ext4_fsblk_t pblk, ext4_lblk_t len);
2324 extern const struct dentry_operations ext4_encrypted_d_ops;
2325 
2326 #ifdef CONFIG_EXT4_FS_ENCRYPTION
2327 int ext4_init_crypto(void);
2328 void ext4_exit_crypto(void);
2329 static inline int ext4_sb_has_crypto(struct super_block *sb)
2330 {
2331         return ext4_has_feature_encrypt(sb);
2332 }
2333 #else
2334 static inline int ext4_init_crypto(void) { return 0; }
2335 static inline void ext4_exit_crypto(void) { }
2336 static inline int ext4_sb_has_crypto(struct super_block *sb)
2337 {
2338         return 0;
2339 }
2340 #endif
2341 
2342 /* crypto_fname.c */
2343 bool ext4_valid_filenames_enc_mode(uint32_t mode);
2344 u32 ext4_fname_crypto_round_up(u32 size, u32 blksize);
2345 unsigned ext4_fname_encrypted_size(struct inode *inode, u32 ilen);
2346 int ext4_fname_crypto_alloc_buffer(struct inode *inode,
2347                                    u32 ilen, struct ext4_str *crypto_str);
2348 int _ext4_fname_disk_to_usr(struct inode *inode,
2349                             struct dx_hash_info *hinfo,
2350                             const struct ext4_str *iname,
2351                             struct ext4_str *oname);
2352 int ext4_fname_disk_to_usr(struct inode *inode,
2353                            struct dx_hash_info *hinfo,
2354                            const struct ext4_dir_entry_2 *de,
2355                            struct ext4_str *oname);
2356 int ext4_fname_usr_to_disk(struct inode *inode,
2357                            const struct qstr *iname,
2358                            struct ext4_str *oname);
2359 #ifdef CONFIG_EXT4_FS_ENCRYPTION
2360 void ext4_fname_crypto_free_buffer(struct ext4_str *crypto_str);
2361 int ext4_fname_setup_filename(struct inode *dir, const struct qstr *iname,
2362                               int lookup, struct ext4_filename *fname);
2363 void ext4_fname_free_filename(struct ext4_filename *fname);
2364 #else
2365 static inline
2366 int ext4_setup_fname_crypto(struct inode *inode)
2367 {
2368         return 0;
2369 }
2370 static inline void ext4_fname_crypto_free_buffer(struct ext4_str *p) { }
2371 static inline int ext4_fname_setup_filename(struct inode *dir,
2372                                      const struct qstr *iname,
2373                                      int lookup, struct ext4_filename *fname)
2374 {
2375         fname->usr_fname = iname;
2376         fname->disk_name.name = (unsigned char *) iname->name;
2377         fname->disk_name.len = iname->len;
2378         return 0;
2379 }
2380 static inline void ext4_fname_free_filename(struct ext4_filename *fname) { }
2381 #endif
2382 
2383 
2384 /* crypto_key.c */
2385 void ext4_free_crypt_info(struct ext4_crypt_info *ci);
2386 void ext4_free_encryption_info(struct inode *inode, struct ext4_crypt_info *ci);
2387 int _ext4_get_encryption_info(struct inode *inode);
2388 
2389 #ifdef CONFIG_EXT4_FS_ENCRYPTION
2390 int ext4_has_encryption_key(struct inode *inode);
2391 
2392 static inline int ext4_get_encryption_info(struct inode *inode)
2393 {
2394         struct ext4_crypt_info *ci = EXT4_I(inode)->i_crypt_info;
2395 
2396         if (!ci ||
2397             (ci->ci_keyring_key &&
2398              (ci->ci_keyring_key->flags & ((1 << KEY_FLAG_INVALIDATED) |
2399                                            (1 << KEY_FLAG_REVOKED) |
2400                                            (1 << KEY_FLAG_DEAD)))))
2401                 return _ext4_get_encryption_info(inode);
2402         return 0;
2403 }
2404 
2405 static inline struct ext4_crypt_info *ext4_encryption_info(struct inode *inode)
2406 {
2407         return EXT4_I(inode)->i_crypt_info;
2408 }
2409 
2410 #else
2411 static inline int ext4_has_encryption_key(struct inode *inode)
2412 {
2413         return 0;
2414 }
2415 static inline int ext4_get_encryption_info(struct inode *inode)
2416 {
2417         return 0;
2418 }
2419 static inline struct ext4_crypt_info *ext4_encryption_info(struct inode *inode)
2420 {
2421         return NULL;
2422 }
2423 #endif
2424 
2425 
2426 /* dir.c */
2427 extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *,
2428                                   struct file *,
2429                                   struct ext4_dir_entry_2 *,
2430                                   struct buffer_head *, char *, int,
2431                                   unsigned int);
2432 #define ext4_check_dir_entry(dir, filp, de, bh, buf, size, offset)      \
2433         unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \
2434                                         (de), (bh), (buf), (size), (offset)))
2435 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
2436                                 __u32 minor_hash,
2437                                 struct ext4_dir_entry_2 *dirent,
2438                                 struct ext4_str *ent_name);
2439 extern void ext4_htree_free_dir_info(struct dir_private_info *p);
2440 extern int ext4_find_dest_de(struct inode *dir, struct inode *inode,
2441                              struct buffer_head *bh,
2442                              void *buf, int buf_size,
2443                              struct ext4_filename *fname,
2444                              struct ext4_dir_entry_2 **dest_de);
2445 int ext4_insert_dentry(struct inode *dir,
2446                        struct inode *inode,
2447                        struct ext4_dir_entry_2 *de,
2448                        int buf_size,
2449                        struct ext4_filename *fname);
2450 static inline void ext4_update_dx_flag(struct inode *inode)
2451 {
2452         if (!ext4_has_feature_dir_index(inode->i_sb))
2453                 ext4_clear_inode_flag(inode, EXT4_INODE_INDEX);
2454 }
2455 static unsigned char ext4_filetype_table[] = {
2456         DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK
2457 };
2458 
2459 static inline  unsigned char get_dtype(struct super_block *sb, int filetype)
2460 {
2461         if (!ext4_has_feature_filetype(sb) || filetype >= EXT4_FT_MAX)
2462                 return DT_UNKNOWN;
2463 
2464         return ext4_filetype_table[filetype];
2465 }
2466 extern int ext4_check_all_de(struct inode *dir, struct buffer_head *bh,
2467                              void *buf, int buf_size);
2468 
2469 /* fsync.c */
2470 extern int ext4_sync_file(struct file *, loff_t, loff_t, int);
2471 
2472 /* hash.c */
2473 extern int ext4fs_dirhash(const char *name, int len, struct
2474                           dx_hash_info *hinfo);
2475 
2476 /* ialloc.c */
2477 extern struct inode *__ext4_new_inode(handle_t *, struct inode *, umode_t,
2478                                       const struct qstr *qstr, __u32 goal,
2479                                       uid_t *owner, int handle_type,
2480                                       unsigned int line_no, int nblocks);
2481 
2482 #define ext4_new_inode(handle, dir, mode, qstr, goal, owner) \
2483         __ext4_new_inode((handle), (dir), (mode), (qstr), (goal), (owner), \
2484                          0, 0, 0)
2485 #define ext4_new_inode_start_handle(dir, mode, qstr, goal, owner, \
2486                                     type, nblocks)                  \
2487         __ext4_new_inode(NULL, (dir), (mode), (qstr), (goal), (owner), \
2488                          (type), __LINE__, (nblocks))
2489 
2490 
2491 extern void ext4_free_inode(handle_t *, struct inode *);
2492 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long);
2493 extern unsigned long ext4_count_free_inodes(struct super_block *);
2494 extern unsigned long ext4_count_dirs(struct super_block *);
2495 extern void ext4_check_inodes_bitmap(struct super_block *);
2496 extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap);
2497 extern int ext4_init_inode_table(struct super_block *sb,
2498                                  ext4_group_t group, int barrier);
2499 extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate);
2500 
2501 /* mballoc.c */
2502 extern const struct file_operations ext4_seq_mb_groups_fops;
2503 extern long ext4_mb_stats;
2504 extern long ext4_mb_max_to_scan;
2505 extern int ext4_mb_init(struct super_block *);
2506 extern int ext4_mb_release(struct super_block *);
2507 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *,
2508                                 struct ext4_allocation_request *, int *);
2509 extern int ext4_mb_reserve_blocks(struct super_block *, int);
2510 extern void ext4_discard_preallocations(struct inode *);
2511 extern int __init ext4_init_mballoc(void);
2512 extern void ext4_exit_mballoc(void);
2513 extern void ext4_free_blocks(handle_t *handle, struct inode *inode,
2514                              struct buffer_head *bh, ext4_fsblk_t block,
2515                              unsigned long count, int flags);
2516 extern int ext4_mb_alloc_groupinfo(struct super_block *sb,
2517                                    ext4_group_t ngroups);
2518 extern int ext4_mb_add_groupinfo(struct super_block *sb,
2519                 ext4_group_t i, struct ext4_group_desc *desc);
2520 extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb,
2521                                 ext4_fsblk_t block, unsigned long count);
2522 extern int ext4_trim_fs(struct super_block *, struct fstrim_range *);
2523 
2524 /* inode.c */
2525 int ext4_inode_is_fast_symlink(struct inode *inode);
2526 struct buffer_head *ext4_getblk(handle_t *, struct inode *, ext4_lblk_t, int);
2527 struct buffer_head *ext4_bread(handle_t *, struct inode *, ext4_lblk_t, int);
2528 int ext4_get_block_unwritten(struct inode *inode, sector_t iblock,
2529                              struct buffer_head *bh_result, int create);
2530 int ext4_dax_get_block(struct inode *inode, sector_t iblock,
2531                        struct buffer_head *bh_result, int create);
2532 int ext4_get_block(struct inode *inode, sector_t iblock,
2533                    struct buffer_head *bh_result, int create);
2534 int ext4_dio_get_block(struct inode *inode, sector_t iblock,
2535                        struct buffer_head *bh_result, int create);
2536 int ext4_da_get_block_prep(struct inode *inode, sector_t iblock,
2537                            struct buffer_head *bh, int create);
2538 int ext4_walk_page_buffers(handle_t *handle,
2539                            struct buffer_head *head,
2540                            unsigned from,
2541                            unsigned to,
2542                            int *partial,
2543                            int (*fn)(handle_t *handle,
2544                                      struct buffer_head *bh));
2545 int do_journal_get_write_access(handle_t *handle,
2546                                 struct buffer_head *bh);
2547 #define FALL_BACK_TO_NONDELALLOC 1
2548 #define CONVERT_INLINE_DATA      2
2549 
2550 extern struct inode *ext4_iget(struct super_block *, unsigned long);
2551 extern struct inode *ext4_iget_normal(struct super_block *, unsigned long);
2552 extern int  ext4_write_inode(struct inode *, struct writeback_control *);
2553 extern int  ext4_setattr(struct dentry *, struct iattr *);
2554 extern int  ext4_getattr(struct vfsmount *mnt, struct dentry *dentry,
2555                                 struct kstat *stat);
2556 extern void ext4_evict_inode(struct inode *);
2557 extern void ext4_clear_inode(struct inode *);
2558 extern int  ext4_sync_inode(handle_t *, struct inode *);
2559 extern void ext4_dirty_inode(struct inode *, int);
2560 extern int ext4_change_inode_journal_flag(struct inode *, int);
2561 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
2562 extern int ext4_inode_attach_jinode(struct inode *inode);
2563 extern int ext4_can_truncate(struct inode *inode);
2564 extern void ext4_truncate(struct inode *);
2565 extern int ext4_punch_hole(struct inode *inode, loff_t offset, loff_t length);
2566 extern int ext4_truncate_restart_trans(handle_t *, struct inode *, int nblocks);
2567 extern void ext4_set_inode_flags(struct inode *);
2568 extern void ext4_get_inode_flags(struct ext4_inode_info *);
2569 extern int ext4_alloc_da_blocks(struct inode *inode);
2570 extern void ext4_set_aops(struct inode *inode);
2571 extern int ext4_writepage_trans_blocks(struct inode *);
2572 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks);
2573 extern int ext4_zero_partial_blocks(handle_t *handle, struct inode *inode,
2574                              loff_t lstart, loff_t lend);
2575 extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf);
2576 extern int ext4_filemap_fault(struct vm_area_struct *vma, struct vm_fault *vmf);
2577 extern qsize_t *ext4_get_reserved_space(struct inode *inode);
2578 extern int ext4_get_projid(struct inode *inode, kprojid_t *projid);
2579 extern void ext4_da_update_reserve_space(struct inode *inode,
2580                                         int used, int quota_claim);
2581 extern int ext4_issue_zeroout(struct inode *inode, ext4_lblk_t lblk,
2582                               ext4_fsblk_t pblk, ext4_lblk_t len);
2583 extern int ext4_get_next_extent(struct inode *inode, ext4_lblk_t lblk,
2584                                 unsigned int map_len,
2585                                 struct extent_status *result);
2586 
2587 /* indirect.c */
2588 extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode,
2589                                 struct ext4_map_blocks *map, int flags);
2590 extern int ext4_ind_calc_metadata_amount(struct inode *inode, sector_t lblock);
2591 extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks);
2592 extern void ext4_ind_truncate(handle_t *, struct inode *inode);
2593 extern int ext4_ind_remove_space(handle_t *handle, struct inode *inode,
2594                                  ext4_lblk_t start, ext4_lblk_t end);
2595 
2596 /* ioctl.c */
2597 extern long ext4_ioctl(struct file *, unsigned int, unsigned long);
2598 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long);
2599 
2600 /* migrate.c */
2601 extern int ext4_ext_migrate(struct inode *);
2602 extern int ext4_ind_migrate(struct inode *inode);
2603 
2604 /* namei.c */
2605 extern int ext4_dirent_csum_verify(struct inode *inode,
2606                                    struct ext4_dir_entry *dirent);
2607 extern int ext4_orphan_add(handle_t *, struct inode *);
2608 extern int ext4_orphan_del(handle_t *, struct inode *);
2609 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
2610                                 __u32 start_minor_hash, __u32 *next_hash);
2611 extern int ext4_search_dir(struct buffer_head *bh,
2612                            char *search_buf,
2613                            int buf_size,
2614                            struct inode *dir,
2615                            struct ext4_filename *fname,
2616                            const struct qstr *d_name,
2617                            unsigned int offset,
2618                            struct ext4_dir_entry_2 **res_dir);
2619 extern int ext4_generic_delete_entry(handle_t *handle,
2620                                      struct inode *dir,
2621                                      struct ext4_dir_entry_2 *de_del,
2622                                      struct buffer_head *bh,
2623                                      void *entry_buf,
2624                                      int buf_size,
2625                                      int csum_size);
2626 extern int ext4_empty_dir(struct inode *inode);
2627 
2628 /* resize.c */
2629 extern int ext4_group_add(struct super_block *sb,
2630                                 struct ext4_new_group_data *input);
2631 extern int ext4_group_extend(struct super_block *sb,
2632                                 struct ext4_super_block *es,
2633                                 ext4_fsblk_t n_blocks_count);
2634 extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count);
2635 
2636 /* super.c */
2637 extern int ext4_seq_options_show(struct seq_file *seq, void *offset);
2638 extern int ext4_calculate_overhead(struct super_block *sb);
2639 extern void ext4_superblock_csum_set(struct super_block *sb);
2640 extern void *ext4_kvmalloc(size_t size, gfp_t flags);
2641 extern void *ext4_kvzalloc(size_t size, gfp_t flags);
2642 extern int ext4_alloc_flex_bg_array(struct super_block *sb,
2643                                     ext4_group_t ngroup);
2644 extern const char *ext4_decode_error(struct super_block *sb, int errno,
2645                                      char nbuf[16]);
2646 
2647 extern __printf(4, 5)
2648 void __ext4_error(struct super_block *, const char *, unsigned int,
2649                   const char *, ...);
2650 extern __printf(5, 6)
2651 void __ext4_error_inode(struct inode *, const char *, unsigned int, ext4_fsblk_t,
2652                       const char *, ...);
2653 extern __printf(5, 6)
2654 void __ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t,
2655                      const char *, ...);
2656 extern void __ext4_std_error(struct super_block *, const char *,
2657                              unsigned int, int);
2658 extern __printf(4, 5)
2659 void __ext4_abort(struct super_block *, const char *, unsigned int,
2660                   const char *, ...);
2661 extern __printf(4, 5)
2662 void __ext4_warning(struct super_block *, const char *, unsigned int,
2663                     const char *, ...);
2664 extern __printf(4, 5)
2665 void __ext4_warning_inode(const struct inode *inode, const char *function,
2666                           unsigned int line, const char *fmt, ...);
2667 extern __printf(3, 4)
2668 void __ext4_msg(struct super_block *, const char *, const char *, ...);
2669 extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp,
2670                            const char *, unsigned int, const char *);
2671 extern __printf(7, 8)
2672 void __ext4_grp_locked_error(const char *, unsigned int,
2673                              struct super_block *, ext4_group_t,
2674                              unsigned long, ext4_fsblk_t,
2675                              const char *, ...);
2676 
2677 #define EXT4_ERROR_INODE(inode, fmt, a...) \
2678         ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a)
2679 
2680 #define EXT4_ERROR_INODE_BLOCK(inode, block, fmt, a...)                 \
2681         ext4_error_inode((inode), __func__, __LINE__, (block), (fmt), ## a)
2682 
2683 #define EXT4_ERROR_FILE(file, block, fmt, a...)                         \
2684         ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a)
2685 
2686 #ifdef CONFIG_PRINTK
2687 
2688 #define ext4_error_inode(inode, func, line, block, fmt, ...)            \
2689         __ext4_error_inode(inode, func, line, block, fmt, ##__VA_ARGS__)
2690 #define ext4_error_file(file, func, line, block, fmt, ...)              \
2691         __ext4_error_file(file, func, line, block, fmt, ##__VA_ARGS__)
2692 #define ext4_error(sb, fmt, ...)                                        \
2693         __ext4_error(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
2694 #define ext4_abort(sb, fmt, ...)                                        \
2695         __ext4_abort(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
2696 #define ext4_warning(sb, fmt, ...)                                      \
2697         __ext4_warning(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
2698 #define ext4_warning_inode(inode, fmt, ...)                             \
2699         __ext4_warning_inode(inode, __func__, __LINE__, fmt, ##__VA_ARGS__)
2700 #define ext4_msg(sb, level, fmt, ...)                           \
2701         __ext4_msg(sb, level, fmt, ##__VA_ARGS__)
2702 #define dump_mmp_msg(sb, mmp, msg)                                      \
2703         __dump_mmp_msg(sb, mmp, __func__, __LINE__, msg)
2704 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...)            \
2705         __ext4_grp_locked_error(__func__, __LINE__, sb, grp, ino, block, \
2706                                 fmt, ##__VA_ARGS__)
2707 
2708 #else
2709 
2710 #define ext4_error_inode(inode, func, line, block, fmt, ...)            \
2711 do {                                                                    \
2712         no_printk(fmt, ##__VA_ARGS__);                                  \
2713         __ext4_error_inode(inode, "", 0, block, " ");                   \
2714 } while (0)
2715 #define ext4_error_file(file, func, line, block, fmt, ...)              \
2716 do {                                                                    \
2717         no_printk(fmt, ##__VA_ARGS__);                                  \
2718         __ext4_error_file(file, "", 0, block, " ");                     \
2719 } while (0)
2720 #define ext4_error(sb, fmt, ...)                                        \
2721 do {                                                                    \
2722         no_printk(fmt, ##__VA_ARGS__);                                  \
2723         __ext4_error(sb, "", 0, " ");                                   \
2724 } while (0)
2725 #define ext4_abort(sb, fmt, ...)                                        \
2726 do {                                                                    \
2727         no_printk(fmt, ##__VA_ARGS__);                                  \
2728         __ext4_abort(sb, "", 0, " ");                                   \
2729 } while (0)
2730 #define ext4_warning(sb, fmt, ...)                                      \
2731 do {                                                                    \
2732         no_printk(fmt, ##__VA_ARGS__);                                  \
2733         __ext4_warning(sb, "", 0, " ");                                 \
2734 } while (0)
2735 #define ext4_warning_inode(inode, fmt, ...)                             \
2736 do {                                                                    \
2737         no_printk(fmt, ##__VA_ARGS__);                                  \
2738         __ext4_warning_inode(inode, "", 0, " ");                        \
2739 } while (0)
2740 #define ext4_msg(sb, level, fmt, ...)                                   \
2741 do {                                                                    \
2742         no_printk(fmt, ##__VA_ARGS__);                                  \
2743         __ext4_msg(sb, "", " ");                                        \
2744 } while (0)
2745 #define dump_mmp_msg(sb, mmp, msg)                                      \
2746         __dump_mmp_msg(sb, mmp, "", 0, "")
2747 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...)            \
2748 do {                                                                    \
2749         no_printk(fmt, ##__VA_ARGS__);                          \
2750         __ext4_grp_locked_error("", 0, sb, grp, ino, block, " ");       \
2751 } while (0)
2752 
2753 #endif
2754 
2755 extern void ext4_update_dynamic_rev(struct super_block *sb);
2756 extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb,
2757                                         __u32 compat);
2758 extern int ext4_update_rocompat_feature(handle_t *handle,
2759                                         struct super_block *sb, __u32 rocompat);
2760 extern int ext4_update_incompat_feature(handle_t *handle,
2761                                         struct super_block *sb, __u32 incompat);
2762 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
2763                                       struct ext4_group_desc *bg);
2764 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
2765                                       struct ext4_group_desc *bg);
2766 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
2767                                      struct ext4_group_desc *bg);
2768 extern __u32 ext4_free_group_clusters(struct super_block *sb,
2769                                       struct ext4_group_desc *bg);
2770 extern __u32 ext4_free_inodes_count(struct super_block *sb,
2771                                  struct ext4_group_desc *bg);
2772 extern __u32 ext4_used_dirs_count(struct super_block *sb,
2773                                 struct ext4_group_desc *bg);
2774 extern __u32 ext4_itable_unused_count(struct super_block *sb,
2775                                    struct ext4_group_desc *bg);
2776 extern void ext4_block_bitmap_set(struct super_block *sb,
2777                                   struct ext4_group_desc *bg, ext4_fsblk_t blk);
2778 extern void ext4_inode_bitmap_set(struct super_block *sb,
2779                                   struct ext4_group_desc *bg, ext4_fsblk_t blk);
2780 extern void ext4_inode_table_set(struct super_block *sb,
2781                                  struct ext4_group_desc *bg, ext4_fsblk_t blk);
2782 extern void ext4_free_group_clusters_set(struct super_block *sb,
2783                                          struct ext4_group_desc *bg,
2784                                          __u32 count);
2785 extern void ext4_free_inodes_set(struct super_block *sb,
2786                                 struct ext4_group_desc *bg, __u32 count);
2787 extern void ext4_used_dirs_set(struct super_block *sb,
2788                                 struct ext4_group_desc *bg, __u32 count);
2789 extern void ext4_itable_unused_set(struct super_block *sb,
2790                                    struct ext4_group_desc *bg, __u32 count);
2791 extern int ext4_group_desc_csum_verify(struct super_block *sb, __u32 group,
2792                                        struct ext4_group_desc *gdp);
2793 extern void ext4_group_desc_csum_set(struct super_block *sb, __u32 group,
2794                                      struct ext4_group_desc *gdp);
2795 extern int ext4_register_li_request(struct super_block *sb,
2796                                     ext4_group_t first_not_zeroed);
2797 
2798 static inline int ext4_has_group_desc_csum(struct super_block *sb)
2799 {
2800         return ext4_has_feature_gdt_csum(sb) ||
2801                EXT4_SB(sb)->s_chksum_driver != NULL;
2802 }
2803 
2804 static inline int ext4_has_metadata_csum(struct super_block *sb)
2805 {
2806         WARN_ON_ONCE(ext4_has_feature_metadata_csum(sb) &&
2807                      !EXT4_SB(sb)->s_chksum_driver);
2808 
2809         return (EXT4_SB(sb)->s_chksum_driver != NULL);
2810 }
2811 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
2812 {
2813         return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) |
2814                 le32_to_cpu(es->s_blocks_count_lo);
2815 }
2816 
2817 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
2818 {
2819         return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) |
2820                 le32_to_cpu(es->s_r_blocks_count_lo);
2821 }
2822 
2823 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
2824 {
2825         return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) |
2826                 le32_to_cpu(es->s_free_blocks_count_lo);
2827 }
2828 
2829 static inline void ext4_blocks_count_set(struct ext4_super_block *es,
2830                                          ext4_fsblk_t blk)
2831 {
2832         es->s_blocks_count_lo = cpu_to_le32((u32)blk);
2833         es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
2834 }
2835 
2836 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
2837                                               ext4_fsblk_t blk)
2838 {
2839         es->s_free_blocks_count_lo = cpu_to_le32((u32)blk);
2840         es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
2841 }
2842 
2843 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
2844                                            ext4_fsblk_t blk)
2845 {
2846         es->s_r_blocks_count_lo = cpu_to_le32((u32)blk);
2847         es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
2848 }
2849 
2850 static inline loff_t ext4_isize(struct ext4_inode *raw_inode)
2851 {
2852         if (S_ISREG(le16_to_cpu(raw_inode->i_mode)))
2853                 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) |
2854                         le32_to_cpu(raw_inode->i_size_lo);
2855         else
2856                 return (loff_t) le32_to_cpu(raw_inode->i_size_lo);
2857 }
2858 
2859 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size)
2860 {
2861         raw_inode->i_size_lo = cpu_to_le32(i_size);
2862         raw_inode->i_size_high = cpu_to_le32(i_size >> 32);
2863 }
2864 
2865 static inline
2866 struct ext4_group_info *ext4_get_group_info(struct super_block *sb,
2867                                             ext4_group_t group)
2868 {
2869          struct ext4_group_info ***grp_info;
2870          long indexv, indexh;
2871          BUG_ON(group >= EXT4_SB(sb)->s_groups_count);
2872          grp_info = EXT4_SB(sb)->s_group_info;
2873          indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb));
2874          indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1);
2875          return grp_info[indexv][indexh];
2876 }
2877 
2878 /*
2879  * Reading s_groups_count requires using smp_rmb() afterwards.  See
2880  * the locking protocol documented in the comments of ext4_group_add()
2881  * in resize.c
2882  */
2883 static inline ext4_group_t ext4_get_groups_count(struct super_block *sb)
2884 {
2885         ext4_group_t    ngroups = EXT4_SB(sb)->s_groups_count;
2886 
2887         smp_rmb();
2888         return ngroups;
2889 }
2890 
2891 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi,
2892                                              ext4_group_t block_group)
2893 {
2894         return block_group >> sbi->s_log_groups_per_flex;
2895 }
2896 
2897 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi)
2898 {
2899         return 1 << sbi->s_log_groups_per_flex;
2900 }
2901 
2902 #define ext4_std_error(sb, errno)                               \
2903 do {                                                            \
2904         if ((errno))                                            \
2905                 __ext4_std_error((sb), __func__, __LINE__, (errno));    \
2906 } while (0)
2907 
2908 #ifdef CONFIG_SMP
2909 /* Each CPU can accumulate percpu_counter_batch clusters in their local
2910  * counters. So we need to make sure we have free clusters more
2911  * than percpu_counter_batch  * nr_cpu_ids. Also add a window of 4 times.
2912  */
2913 #define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids))
2914 #else
2915 #define EXT4_FREECLUSTERS_WATERMARK 0
2916 #endif
2917 
2918 /* Update i_disksize. Requires i_mutex to avoid races with truncate */
2919 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize)
2920 {
2921         WARN_ON_ONCE(S_ISREG(inode->i_mode) &&
2922                      !inode_is_locked(inode));
2923         down_write(&EXT4_I(inode)->i_data_sem);
2924         if (newsize > EXT4_I(inode)->i_disksize)
2925                 EXT4_I(inode)->i_disksize = newsize;
2926         up_write(&EXT4_I(inode)->i_data_sem);
2927 }
2928 
2929 /* Update i_size, i_disksize. Requires i_mutex to avoid races with truncate */
2930 static inline int ext4_update_inode_size(struct inode *inode, loff_t newsize)
2931 {
2932         int changed = 0;
2933 
2934         if (newsize > inode->i_size) {
2935                 i_size_write(inode, newsize);
2936                 changed = 1;
2937         }
2938         if (newsize > EXT4_I(inode)->i_disksize) {
2939                 ext4_update_i_disksize(inode, newsize);
2940                 changed |= 2;
2941         }
2942         return changed;
2943 }
2944 
2945 int ext4_update_disksize_before_punch(struct inode *inode, loff_t offset,
2946                                       loff_t len);
2947 
2948 struct ext4_group_info {
2949         unsigned long   bb_state;
2950         struct rb_root  bb_free_root;
2951         ext4_grpblk_t   bb_first_free;  /* first free block */
2952         ext4_grpblk_t   bb_free;        /* total free blocks */
2953         ext4_grpblk_t   bb_fragments;   /* nr of freespace fragments */
2954         ext4_grpblk_t   bb_largest_free_order;/* order of largest frag in BG */
2955         struct          list_head bb_prealloc_list;
2956 #ifdef DOUBLE_CHECK
2957         void            *bb_bitmap;
2958 #endif
2959         struct rw_semaphore alloc_sem;
2960         ext4_grpblk_t   bb_counters[];  /* Nr of free power-of-two-block
2961                                          * regions, index is order.
2962                                          * bb_counters[3] = 5 means
2963                                          * 5 free 8-block regions. */
2964 };
2965 
2966 #define EXT4_GROUP_INFO_NEED_INIT_BIT           0
2967 #define EXT4_GROUP_INFO_WAS_TRIMMED_BIT         1
2968 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT     2
2969 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT     3
2970 
2971 #define EXT4_MB_GRP_NEED_INIT(grp)      \
2972         (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state)))
2973 #define EXT4_MB_GRP_BBITMAP_CORRUPT(grp)        \
2974         (test_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &((grp)->bb_state)))
2975 #define EXT4_MB_GRP_IBITMAP_CORRUPT(grp)        \
2976         (test_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &((grp)->bb_state)))
2977 
2978 #define EXT4_MB_GRP_WAS_TRIMMED(grp)    \
2979         (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2980 #define EXT4_MB_GRP_SET_TRIMMED(grp)    \
2981         (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2982 #define EXT4_MB_GRP_CLEAR_TRIMMED(grp)  \
2983         (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2984 
2985 #define EXT4_MAX_CONTENTION             8
2986 #define EXT4_CONTENTION_THRESHOLD       2
2987 
2988 static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb,
2989                                               ext4_group_t group)
2990 {
2991         return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group);
2992 }
2993 
2994 /*
2995  * Returns true if the filesystem is busy enough that attempts to
2996  * access the block group locks has run into contention.
2997  */
2998 static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi)
2999 {
3000         return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD);
3001 }
3002 
3003 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group)
3004 {
3005         spinlock_t *lock = ext4_group_lock_ptr(sb, group);
3006         if (spin_trylock(lock))
3007                 /*
3008                  * We're able to grab the lock right away, so drop the
3009                  * lock contention counter.
3010                  */
3011                 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0);
3012         else {
3013                 /*
3014                  * The lock is busy, so bump the contention counter,
3015                  * and then wait on the spin lock.
3016                  */
3017                 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1,
3018                                   EXT4_MAX_CONTENTION);
3019                 spin_lock(lock);
3020         }
3021 }
3022 
3023 static inline void ext4_unlock_group(struct super_block *sb,
3024                                         ext4_group_t group)
3025 {
3026         spin_unlock(ext4_group_lock_ptr(sb, group));
3027 }
3028 
3029 /*
3030  * Block validity checking
3031  */
3032 #define ext4_check_indirect_blockref(inode, bh)                         \
3033         ext4_check_blockref(__func__, __LINE__, inode,                  \
3034                             (__le32 *)(bh)->b_data,                     \
3035                             EXT4_ADDR_PER_BLOCK((inode)->i_sb))
3036 
3037 #define ext4_ind_check_inode(inode)                                     \
3038         ext4_check_blockref(__func__, __LINE__, inode,                  \
3039                             EXT4_I(inode)->i_data,                      \
3040                             EXT4_NDIR_BLOCKS)
3041 
3042 /*
3043  * Inodes and files operations
3044  */
3045 
3046 /* dir.c */
3047 extern const struct file_operations ext4_dir_operations;
3048 
3049 /* file.c */
3050 extern const struct inode_operations ext4_file_inode_operations;
3051 extern const struct file_operations ext4_file_operations;
3052 extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin);
3053 
3054 /* inline.c */
3055 extern int ext4_get_max_inline_size(struct inode *inode);
3056 extern int ext4_find_inline_data_nolock(struct inode *inode);
3057 extern int ext4_init_inline_data(handle_t *handle, struct inode *inode,
3058                                  unsigned int len);
3059 extern int ext4_destroy_inline_data(handle_t *handle, struct inode *inode);
3060 
3061 extern int ext4_readpage_inline(struct inode *inode, struct page *page);
3062 extern int ext4_try_to_write_inline_data(struct address_space *mapping,
3063                                          struct inode *inode,
3064                                          loff_t pos, unsigned len,
3065                                          unsigned flags,
3066                                          struct page **pagep);
3067 extern int ext4_write_inline_data_end(struct inode *inode,
3068                                       loff_t pos, unsigned len,
3069                                       unsigned copied,
3070                                       struct page *page);
3071 extern struct buffer_head *
3072 ext4_journalled_write_inline_data(struct inode *inode,
3073                                   unsigned len,
3074                                   struct page *page);
3075 extern int ext4_da_write_inline_data_begin(struct address_space *mapping,
3076                                            struct inode *inode,
3077                                            loff_t pos, unsigned len,
3078                                            unsigned flags,
3079                                            struct page **pagep,
3080                                            void **fsdata);
3081 extern int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos,
3082                                          unsigned len, unsigned copied,
3083                                          struct page *page);
3084 extern int ext4_try_add_inline_entry(handle_t *handle,
3085                                      struct ext4_filename *fname,
3086                                      struct inode *dir, struct inode *inode);
3087 extern int ext4_try_create_inline_dir(handle_t *handle,
3088                                       struct inode *parent,
3089                                       struct inode *inode);
3090 extern int ext4_read_inline_dir(struct file *filp,
3091                                 struct dir_context *ctx,
3092                                 int *has_inline_data);
3093 extern int htree_inlinedir_to_tree(struct file *dir_file,
3094                                    struct inode *dir, ext4_lblk_t block,
3095                                    struct dx_hash_info *hinfo,
3096                                    __u32 start_hash, __u32 start_minor_hash,
3097                                    int *has_inline_data);
3098 extern struct buffer_head *ext4_find_inline_entry(struct inode *dir,
3099                                         struct ext4_filename *fname,
3100                                         const struct qstr *d_name,
3101                                         struct ext4_dir_entry_2 **res_dir,
3102                                         int *has_inline_data);
3103 extern int ext4_delete_inline_entry(handle_t *handle,
3104                                     struct inode *dir,
3105                                     struct ext4_dir_entry_2 *de_del,
3106                                     struct buffer_head *bh,
3107                                     int *has_inline_data);
3108 extern int empty_inline_dir(struct inode *dir, int *has_inline_data);
3109 extern struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
3110                                         struct ext4_dir_entry_2 **parent_de,
3111                                         int *retval);
3112 extern int ext4_inline_data_fiemap(struct inode *inode,
3113                                    struct fiemap_extent_info *fieinfo,
3114                                    int *has_inline, __u64 start, __u64 len);
3115 extern int ext4_try_to_evict_inline_data(handle_t *handle,
3116                                          struct inode *inode,
3117                                          int needed);
3118 extern void ext4_inline_data_truncate(struct inode *inode, int *has_inline);
3119 
3120 extern int ext4_convert_inline_data(struct inode *inode);
3121 
3122 static inline int ext4_has_inline_data(struct inode *inode)
3123 {
3124         return ext4_test_inode_flag(inode, EXT4_INODE_INLINE_DATA) &&
3125                EXT4_I(inode)->i_inline_off;
3126 }
3127 
3128 /* namei.c */
3129 extern const struct inode_operations ext4_dir_inode_operations;
3130 extern const struct inode_operations ext4_special_inode_operations;
3131 extern struct dentry *ext4_get_parent(struct dentry *child);
3132 extern struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode,
3133                                  struct ext4_dir_entry_2 *de,
3134                                  int blocksize, int csum_size,
3135                                  unsigned int parent_ino, int dotdot_real_len);
3136 extern void initialize_dirent_tail(struct ext4_dir_entry_tail *t,
3137                                    unsigned int blocksize);
3138 extern int ext4_handle_dirty_dirent_node(handle_t *handle,
3139                                          struct inode *inode,
3140                                          struct buffer_head *bh);
3141 #define S_SHIFT 12
3142 static unsigned char ext4_type_by_mode[S_IFMT >> S_SHIFT] = {
3143         [S_IFREG >> S_SHIFT]    = EXT4_FT_REG_FILE,
3144         [S_IFDIR >> S_SHIFT]    = EXT4_FT_DIR,
3145         [S_IFCHR >> S_SHIFT]    = EXT4_FT_CHRDEV,
3146         [S_IFBLK >> S_SHIFT]    = EXT4_FT_BLKDEV,
3147         [S_IFIFO >> S_SHIFT]    = EXT4_FT_FIFO,
3148         [S_IFSOCK >> S_SHIFT]   = EXT4_FT_SOCK,
3149         [S_IFLNK >> S_SHIFT]    = EXT4_FT_SYMLINK,
3150 };
3151 
3152 static inline void ext4_set_de_type(struct super_block *sb,
3153                                 struct ext4_dir_entry_2 *de,
3154                                 umode_t mode) {
3155         if (ext4_has_feature_filetype(sb))
3156                 de->file_type = ext4_type_by_mode[(mode & S_IFMT)>>S_SHIFT];
3157 }
3158 
3159 /* readpages.c */
3160 extern int ext4_mpage_readpages(struct address_space *mapping,
3161                                 struct list_head *pages, struct page *page,
3162                                 unsigned nr_pages);
3163 
3164 /* symlink.c */
3165 extern const struct inode_operations ext4_encrypted_symlink_inode_operations;
3166 extern const struct inode_operations ext4_symlink_inode_operations;
3167 extern const struct inode_operations ext4_fast_symlink_inode_operations;
3168 
3169 /* sysfs.c */
3170 extern int ext4_register_sysfs(struct super_block *sb);
3171 extern void ext4_unregister_sysfs(struct super_block *sb);
3172 extern int __init ext4_init_sysfs(void);
3173 extern void ext4_exit_sysfs(void);
3174 
3175 /* block_validity */
3176 extern void ext4_release_system_zone(struct super_block *sb);
3177 extern int ext4_setup_system_zone(struct super_block *sb);
3178 extern int __init ext4_init_system_zone(void);
3179 extern void ext4_exit_system_zone(void);
3180 extern int ext4_data_block_valid(struct ext4_sb_info *sbi,
3181                                  ext4_fsblk_t start_blk,
3182                                  unsigned int count);
3183 extern int ext4_check_blockref(const char *, unsigned int,
3184                                struct inode *, __le32 *, unsigned int);
3185 
3186 /* extents.c */
3187 struct ext4_ext_path;
3188 struct ext4_extent;
3189 
3190 /*
3191  * Maximum number of logical blocks in a file; ext4_extent's ee_block is
3192  * __le32.
3193  */
3194 #define EXT_MAX_BLOCKS  0xffffffff
3195 
3196 extern int ext4_ext_tree_init(handle_t *handle, struct inode *);
3197 extern int ext4_ext_writepage_trans_blocks(struct inode *, int);
3198 extern int ext4_ext_index_trans_blocks(struct inode *inode, int extents);
3199 extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
3200                                struct ext4_map_blocks *map, int flags);
3201 extern void ext4_ext_truncate(handle_t *, struct inode *);
3202 extern int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start,
3203                                  ext4_lblk_t end);
3204 extern void ext4_ext_init(struct super_block *);
3205 extern void ext4_ext_release(struct super_block *);
3206 extern long ext4_fallocate(struct file *file, int mode, loff_t offset,
3207                           loff_t len);
3208 extern int ext4_convert_unwritten_extents(handle_t *handle, struct inode *inode,
3209                                           loff_t offset, ssize_t len);
3210 extern int ext4_map_blocks(handle_t *handle, struct inode *inode,
3211                            struct ext4_map_blocks *map, int flags);
3212 extern int ext4_ext_calc_metadata_amount(struct inode *inode,
3213                                          ext4_lblk_t lblocks);
3214 extern int ext4_ext_calc_credits_for_single_extent(struct inode *inode,
3215                                                    int num,
3216                                                    struct ext4_ext_path *path);
3217 extern int ext4_can_extents_be_merged(struct inode *inode,
3218                                       struct ext4_extent *ex1,
3219                                       struct ext4_extent *ex2);
3220 extern int ext4_ext_insert_extent(handle_t *, struct inode *,
3221                                   struct ext4_ext_path **,
3222                                   struct ext4_extent *, int);
3223 extern struct ext4_ext_path *ext4_find_extent(struct inode *, ext4_lblk_t,
3224                                               struct ext4_ext_path **,
3225                                               int flags);
3226 extern void ext4_ext_drop_refs(struct ext4_ext_path *);
3227 extern int ext4_ext_check_inode(struct inode *inode);
3228 extern int ext4_find_delalloc_range(struct inode *inode,
3229                                     ext4_lblk_t lblk_start,
3230                                     ext4_lblk_t lblk_end);
3231 extern int ext4_find_delalloc_cluster(struct inode *inode, ext4_lblk_t lblk);
3232 extern ext4_lblk_t ext4_ext_next_allocated_block(struct ext4_ext_path *path);
3233 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
3234                         __u64 start, __u64 len);
3235 extern int ext4_ext_precache(struct inode *inode);
3236 extern int ext4_collapse_range(struct inode *inode, loff_t offset, loff_t len);
3237 extern int ext4_insert_range(struct inode *inode, loff_t offset, loff_t len);
3238 extern int ext4_swap_extents(handle_t *handle, struct inode *inode1,
3239                                 struct inode *inode2, ext4_lblk_t lblk1,
3240                              ext4_lblk_t lblk2,  ext4_lblk_t count,
3241                              int mark_unwritten,int *err);
3242 
3243 /* move_extent.c */
3244 extern void ext4_double_down_write_data_sem(struct inode *first,
3245                                             struct inode *second);
3246 extern void ext4_double_up_write_data_sem(struct inode *orig_inode,
3247                                           struct inode *donor_inode);
3248 extern int ext4_move_extents(struct file *o_filp, struct file *d_filp,
3249                              __u64 start_orig, __u64 start_donor,
3250                              __u64 len, __u64 *moved_len);
3251 
3252 /* page-io.c */
3253 extern int __init ext4_init_pageio(void);
3254 extern void ext4_exit_pageio(void);
3255 extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags);
3256 extern ext4_io_end_t *ext4_get_io_end(ext4_io_end_t *io_end);
3257 extern int ext4_put_io_end(ext4_io_end_t *io_end);
3258 extern void ext4_put_io_end_defer(ext4_io_end_t *io_end);
3259 extern void ext4_io_submit_init(struct ext4_io_submit *io,
3260                                 struct writeback_control *wbc);
3261 extern void ext4_end_io_rsv_work(struct work_struct *work);
3262 extern void ext4_io_submit(struct ext4_io_submit *io);
3263 extern int ext4_bio_write_page(struct ext4_io_submit *io,
3264                                struct page *page,
3265                                int len,
3266                                struct writeback_control *wbc,
3267                                bool keep_towrite);
3268 
3269 /* mmp.c */
3270 extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t);
3271 
3272 /*
3273  * Add new method to test whether block and inode bitmaps are properly
3274  * initialized. With uninit_bg reading the block from disk is not enough
3275  * to mark the bitmap uptodate. We need to also zero-out the bitmap
3276  */
3277 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart
3278 
3279 static inline int bitmap_uptodate(struct buffer_head *bh)
3280 {
3281         return (buffer_uptodate(bh) &&
3282                         test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state));
3283 }
3284 static inline void set_bitmap_uptodate(struct buffer_head *bh)
3285 {
3286         set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state);
3287 }
3288 
3289 /*
3290  * Disable DIO read nolock optimization, so new dioreaders will be forced
3291  * to grab i_mutex
3292  */
3293 static inline void ext4_inode_block_unlocked_dio(struct inode *inode)
3294 {
3295         ext4_set_inode_state(inode, EXT4_STATE_DIOREAD_LOCK);
3296         smp_mb();
3297 }
3298 static inline void ext4_inode_resume_unlocked_dio(struct inode *inode)
3299 {
3300         smp_mb();
3301         ext4_clear_inode_state(inode, EXT4_STATE_DIOREAD_LOCK);
3302 }
3303 
3304 #define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1)
3305 
3306 /* For ioend & aio unwritten conversion wait queues */
3307 #define EXT4_WQ_HASH_SZ         37
3308 #define ext4_ioend_wq(v)   (&ext4__ioend_wq[((unsigned long)(v)) %\
3309                                             EXT4_WQ_HASH_SZ])
3310 extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
3311 
3312 #define EXT4_RESIZING   0
3313 extern int ext4_resize_begin(struct super_block *sb);
3314 extern void ext4_resize_end(struct super_block *sb);
3315 
3316 static inline void ext4_set_io_unwritten_flag(struct inode *inode,
3317                                               struct ext4_io_end *io_end)
3318 {
3319         if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) {
3320                 io_end->flag |= EXT4_IO_END_UNWRITTEN;
3321                 atomic_inc(&EXT4_I(inode)->i_unwritten);
3322         }
3323 }
3324 
3325 static inline void ext4_clear_io_unwritten_flag(ext4_io_end_t *io_end)
3326 {
3327         struct inode *inode = io_end->inode;
3328 
3329         if (io_end->flag & EXT4_IO_END_UNWRITTEN) {
3330                 io_end->flag &= ~EXT4_IO_END_UNWRITTEN;
3331                 /* Wake up anyone waiting on unwritten extent conversion */
3332                 if (atomic_dec_and_test(&EXT4_I(inode)->i_unwritten))
3333                         wake_up_all(ext4_ioend_wq(inode));
3334         }
3335 }
3336 
3337 static inline bool ext4_aligned_io(struct inode *inode, loff_t off, loff_t len)
3338 {
3339         int blksize = 1 << inode->i_blkbits;
3340 
3341         return IS_ALIGNED(off, blksize) && IS_ALIGNED(len, blksize);
3342 }
3343 
3344 #endif  /* __KERNEL__ */
3345 
3346 #define EFSBADCRC       EBADMSG         /* Bad CRC detected */
3347 #define EFSCORRUPTED    EUCLEAN         /* Filesystem is corrupted */
3348 
3349 #endif  /* _EXT4_H */
3350 

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