xref: /linux/fs/ext4/ext4.h (revision 9f771739a04919226081a107167596de75108fbb)
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  *  ext4.h
4  *
5  * Copyright (C) 1992, 1993, 1994, 1995
6  * Remy Card (card@masi.ibp.fr)
7  * Laboratoire MASI - Institut Blaise Pascal
8  * Universite Pierre et Marie Curie (Paris VI)
9  *
10  *  from
11  *
12  *  linux/include/linux/minix_fs.h
13  *
14  *  Copyright (C) 1991, 1992  Linus Torvalds
15  */
16 
17 #ifndef _EXT4_H
18 #define _EXT4_H
19 
20 #include <linux/refcount.h>
21 #include <linux/types.h>
22 #include <linux/blkdev.h>
23 #include <linux/magic.h>
24 #include <linux/jbd2.h>
25 #include <linux/quota.h>
26 #include <linux/rwsem.h>
27 #include <linux/rbtree.h>
28 #include <linux/seqlock.h>
29 #include <linux/mutex.h>
30 #include <linux/timer.h>
31 #include <linux/wait.h>
32 #include <linux/sched/signal.h>
33 #include <linux/blockgroup_lock.h>
34 #include <linux/percpu_counter.h>
35 #include <linux/ratelimit.h>
36 #include <crypto/hash.h>
37 #include <linux/falloc.h>
38 #include <linux/percpu-rwsem.h>
39 #include <linux/fiemap.h>
40 #ifdef __KERNEL__
41 #include <linux/compat.h>
42 #endif
43 #include <uapi/linux/ext4.h>
44 
45 #include <linux/fscrypt.h>
46 #include <linux/fsverity.h>
47 
48 #include <linux/compiler.h>
49 
50 /*
51  * The fourth extended filesystem constants/structures
52  */
53 
54 /*
55  * with AGGRESSIVE_CHECK allocator runs consistency checks over
56  * structures. these checks slow things down a lot
57  */
58 #define AGGRESSIVE_CHECK__
59 
60 /*
61  * with DOUBLE_CHECK defined mballoc creates persistent in-core
62  * bitmaps, maintains and uses them to check for double allocations
63  */
64 #define DOUBLE_CHECK__
65 
66 /*
67  * Define EXT4FS_DEBUG to produce debug messages
68  */
69 #undef EXT4FS_DEBUG
70 
71 /*
72  * Debug code
73  */
74 #ifdef EXT4FS_DEBUG
75 #define ext4_debug(f, a...)						\
76 	do {								\
77 		printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:",	\
78 			__FILE__, __LINE__, __func__);			\
79 		printk(KERN_DEBUG f, ## a);				\
80 	} while (0)
81 #else
82 #define ext4_debug(fmt, ...)	no_printk(fmt, ##__VA_ARGS__)
83 #endif
84 
85  /*
86   * Turn on EXT_DEBUG to enable ext4_ext_show_path/leaf/move in extents.c
87   */
88 #define EXT_DEBUG__
89 
90 /*
91  * Dynamic printk for controlled extents debugging.
92  */
93 #ifdef CONFIG_EXT4_DEBUG
94 #define ext_debug(ino, fmt, ...)					\
95 	pr_debug("[%s/%d] EXT4-fs (%s): ino %lu: (%s, %d): %s:" fmt,	\
96 		 current->comm, task_pid_nr(current),			\
97 		 ino->i_sb->s_id, ino->i_ino, __FILE__, __LINE__,	\
98 		 __func__, ##__VA_ARGS__)
99 #else
100 #define ext_debug(ino, fmt, ...)	no_printk(fmt, ##__VA_ARGS__)
101 #endif
102 
103 #define ASSERT(assert)						\
104 do {									\
105 	if (unlikely(!(assert))) {					\
106 		printk(KERN_EMERG					\
107 		       "Assertion failure in %s() at %s:%d: '%s'\n",	\
108 		       __func__, __FILE__, __LINE__, #assert);		\
109 		BUG();							\
110 	}								\
111 } while (0)
112 
113 /* data type for block offset of block group */
114 typedef int ext4_grpblk_t;
115 
116 /* data type for filesystem-wide blocks number */
117 typedef unsigned long long ext4_fsblk_t;
118 
119 /* data type for file logical block number */
120 typedef __u32 ext4_lblk_t;
121 
122 /* data type for block group number */
123 typedef unsigned int ext4_group_t;
124 
125 enum SHIFT_DIRECTION {
126 	SHIFT_LEFT = 0,
127 	SHIFT_RIGHT,
128 };
129 
130 /*
131  * For each criteria, mballoc has slightly different way of finding
132  * the required blocks nad usually, higher the criteria the slower the
133  * allocation.  We start at lower criterias and keep falling back to
134  * higher ones if we are not able to find any blocks.  Lower (earlier)
135  * criteria are faster.
136  */
137 enum criteria {
138 	/*
139 	 * Used when number of blocks needed is a power of 2. This
140 	 * doesn't trigger any disk IO except prefetch and is the
141 	 * fastest criteria.
142 	 */
143 	CR_POWER2_ALIGNED,
144 
145 	/*
146 	 * Tries to lookup in-memory data structures to find the most
147 	 * suitable group that satisfies goal request. No disk IO
148 	 * except block prefetch.
149 	 */
150 	CR_GOAL_LEN_FAST,
151 
152         /*
153 	 * Same as CR_GOAL_LEN_FAST but is allowed to reduce the goal
154          * length to the best available length for faster allocation.
155 	 */
156 	CR_BEST_AVAIL_LEN,
157 
158 	/*
159 	 * Reads each block group sequentially, performing disk IO if
160 	 * necessary, to find find_suitable block group. Tries to
161 	 * allocate goal length but might trim the request if nothing
162 	 * is found after enough tries.
163 	 */
164 	CR_GOAL_LEN_SLOW,
165 
166 	/*
167 	 * Finds the first free set of blocks and allocates
168 	 * those. This is only used in rare cases when
169 	 * CR_GOAL_LEN_SLOW also fails to allocate anything.
170 	 */
171 	CR_ANY_FREE,
172 
173 	/*
174 	 * Number of criterias defined.
175 	 */
176 	EXT4_MB_NUM_CRS
177 };
178 
179 /* criteria below which we use fast block scanning and avoid unnecessary IO */
180 #define CR_FAST CR_GOAL_LEN_SLOW
181 
182 /*
183  * Flags used in mballoc's allocation_context flags field.
184  *
185  * Also used to show what's going on for debugging purposes when the
186  * flag field is exported via the traceport interface
187  */
188 
189 /* prefer goal again. length */
190 #define EXT4_MB_HINT_MERGE		0x0001
191 /* blocks already reserved */
192 #define EXT4_MB_HINT_RESERVED		0x0002
193 /* metadata is being allocated */
194 #define EXT4_MB_HINT_METADATA		0x0004
195 /* first blocks in the file */
196 #define EXT4_MB_HINT_FIRST		0x0008
197 /* search for the best chunk */
198 #define EXT4_MB_HINT_BEST		0x0010
199 /* data is being allocated */
200 #define EXT4_MB_HINT_DATA		0x0020
201 /* don't preallocate (for tails) */
202 #define EXT4_MB_HINT_NOPREALLOC		0x0040
203 /* allocate for locality group */
204 #define EXT4_MB_HINT_GROUP_ALLOC	0x0080
205 /* allocate goal blocks or none */
206 #define EXT4_MB_HINT_GOAL_ONLY		0x0100
207 /* goal is meaningful */
208 #define EXT4_MB_HINT_TRY_GOAL		0x0200
209 /* blocks already pre-reserved by delayed allocation */
210 #define EXT4_MB_DELALLOC_RESERVED	0x0400
211 /* We are doing stream allocation */
212 #define EXT4_MB_STREAM_ALLOC		0x0800
213 /* Use reserved root blocks if needed */
214 #define EXT4_MB_USE_ROOT_BLOCKS		0x1000
215 /* Use blocks from reserved pool */
216 #define EXT4_MB_USE_RESERVED		0x2000
217 /* Do strict check for free blocks while retrying block allocation */
218 #define EXT4_MB_STRICT_CHECK		0x4000
219 /* Large fragment size list lookup succeeded at least once for cr = 0 */
220 #define EXT4_MB_CR_POWER2_ALIGNED_OPTIMIZED		0x8000
221 /* Avg fragment size rb tree lookup succeeded at least once for cr = 1 */
222 #define EXT4_MB_CR_GOAL_LEN_FAST_OPTIMIZED		0x00010000
223 /* Avg fragment size rb tree lookup succeeded at least once for cr = 1.5 */
224 #define EXT4_MB_CR_BEST_AVAIL_LEN_OPTIMIZED		0x00020000
225 
226 struct ext4_allocation_request {
227 	/* target inode for block we're allocating */
228 	struct inode *inode;
229 	/* how many blocks we want to allocate */
230 	unsigned int len;
231 	/* logical block in target inode */
232 	ext4_lblk_t logical;
233 	/* the closest logical allocated block to the left */
234 	ext4_lblk_t lleft;
235 	/* the closest logical allocated block to the right */
236 	ext4_lblk_t lright;
237 	/* phys. target (a hint) */
238 	ext4_fsblk_t goal;
239 	/* phys. block for the closest logical allocated block to the left */
240 	ext4_fsblk_t pleft;
241 	/* phys. block for the closest logical allocated block to the right */
242 	ext4_fsblk_t pright;
243 	/* flags. see above EXT4_MB_HINT_* */
244 	unsigned int flags;
245 };
246 
247 /*
248  * Logical to physical block mapping, used by ext4_map_blocks()
249  *
250  * This structure is used to pass requests into ext4_map_blocks() as
251  * well as to store the information returned by ext4_map_blocks().  It
252  * takes less room on the stack than a struct buffer_head.
253  */
254 #define EXT4_MAP_NEW		BIT(BH_New)
255 #define EXT4_MAP_MAPPED		BIT(BH_Mapped)
256 #define EXT4_MAP_UNWRITTEN	BIT(BH_Unwritten)
257 #define EXT4_MAP_BOUNDARY	BIT(BH_Boundary)
258 #define EXT4_MAP_FLAGS		(EXT4_MAP_NEW | EXT4_MAP_MAPPED |\
259 				 EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY)
260 
261 struct ext4_map_blocks {
262 	ext4_fsblk_t m_pblk;
263 	ext4_lblk_t m_lblk;
264 	unsigned int m_len;
265 	unsigned int m_flags;
266 };
267 
268 /*
269  * Block validity checking, system zone rbtree.
270  */
271 struct ext4_system_blocks {
272 	struct rb_root root;
273 	struct rcu_head rcu;
274 };
275 
276 /*
277  * Flags for ext4_io_end->flags
278  */
279 #define	EXT4_IO_END_UNWRITTEN	0x0001
280 
281 struct ext4_io_end_vec {
282 	struct list_head list;		/* list of io_end_vec */
283 	loff_t offset;			/* offset in the file */
284 	ssize_t size;			/* size of the extent */
285 };
286 
287 /*
288  * For converting unwritten extents on a work queue. 'handle' is used for
289  * buffered writeback.
290  */
291 typedef struct ext4_io_end {
292 	struct list_head	list;		/* per-file finished IO list */
293 	handle_t		*handle;	/* handle reserved for extent
294 						 * conversion */
295 	struct inode		*inode;		/* file being written to */
296 	struct bio		*bio;		/* Linked list of completed
297 						 * bios covering the extent */
298 	unsigned int		flag;		/* unwritten or not */
299 	refcount_t		count;		/* reference counter */
300 	struct list_head	list_vec;	/* list of ext4_io_end_vec */
301 } ext4_io_end_t;
302 
303 struct ext4_io_submit {
304 	struct writeback_control *io_wbc;
305 	struct bio		*io_bio;
306 	ext4_io_end_t		*io_end;
307 	sector_t		io_next_block;
308 };
309 
310 /*
311  * Special inodes numbers
312  */
313 #define	EXT4_BAD_INO		 1	/* Bad blocks inode */
314 #define EXT4_ROOT_INO		 2	/* Root inode */
315 #define EXT4_USR_QUOTA_INO	 3	/* User quota inode */
316 #define EXT4_GRP_QUOTA_INO	 4	/* Group quota inode */
317 #define EXT4_BOOT_LOADER_INO	 5	/* Boot loader inode */
318 #define EXT4_UNDEL_DIR_INO	 6	/* Undelete directory inode */
319 #define EXT4_RESIZE_INO		 7	/* Reserved group descriptors inode */
320 #define EXT4_JOURNAL_INO	 8	/* Journal inode */
321 
322 /* First non-reserved inode for old ext4 filesystems */
323 #define EXT4_GOOD_OLD_FIRST_INO	11
324 
325 /*
326  * Maximal count of links to a file
327  */
328 #define EXT4_LINK_MAX		65000
329 
330 /*
331  * Macro-instructions used to manage several block sizes
332  */
333 #define EXT4_MIN_BLOCK_SIZE		1024
334 #define	EXT4_MAX_BLOCK_SIZE		65536
335 #define EXT4_MIN_BLOCK_LOG_SIZE		10
336 #define EXT4_MAX_BLOCK_LOG_SIZE		16
337 #define EXT4_MAX_CLUSTER_LOG_SIZE	30
338 #ifdef __KERNEL__
339 # define EXT4_BLOCK_SIZE(s)		((s)->s_blocksize)
340 #else
341 # define EXT4_BLOCK_SIZE(s)		(EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
342 #endif
343 #define	EXT4_ADDR_PER_BLOCK(s)		(EXT4_BLOCK_SIZE(s) / sizeof(__u32))
344 #define EXT4_CLUSTER_SIZE(s)		(EXT4_BLOCK_SIZE(s) << \
345 					 EXT4_SB(s)->s_cluster_bits)
346 #ifdef __KERNEL__
347 # define EXT4_BLOCK_SIZE_BITS(s)	((s)->s_blocksize_bits)
348 # define EXT4_CLUSTER_BITS(s)		(EXT4_SB(s)->s_cluster_bits)
349 #else
350 # define EXT4_BLOCK_SIZE_BITS(s)	((s)->s_log_block_size + 10)
351 #endif
352 #ifdef __KERNEL__
353 #define	EXT4_ADDR_PER_BLOCK_BITS(s)	(EXT4_SB(s)->s_addr_per_block_bits)
354 #define EXT4_INODE_SIZE(s)		(EXT4_SB(s)->s_inode_size)
355 #define EXT4_FIRST_INO(s)		(EXT4_SB(s)->s_first_ino)
356 #else
357 #define EXT4_INODE_SIZE(s)	(((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
358 				 EXT4_GOOD_OLD_INODE_SIZE : \
359 				 (s)->s_inode_size)
360 #define EXT4_FIRST_INO(s)	(((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
361 				 EXT4_GOOD_OLD_FIRST_INO : \
362 				 (s)->s_first_ino)
363 #endif
364 #define EXT4_BLOCK_ALIGN(size, blkbits)		ALIGN((size), (1 << (blkbits)))
365 #define EXT4_MAX_BLOCKS(size, offset, blkbits) \
366 	((EXT4_BLOCK_ALIGN(size + offset, blkbits) >> blkbits) - (offset >> \
367 								  blkbits))
368 
369 /* Translate a block number to a cluster number */
370 #define EXT4_B2C(sbi, blk)	((blk) >> (sbi)->s_cluster_bits)
371 /* Translate a cluster number to a block number */
372 #define EXT4_C2B(sbi, cluster)	((cluster) << (sbi)->s_cluster_bits)
373 /* Translate # of blks to # of clusters */
374 #define EXT4_NUM_B2C(sbi, blks)	(((blks) + (sbi)->s_cluster_ratio - 1) >> \
375 				 (sbi)->s_cluster_bits)
376 /* Mask out the low bits to get the starting block of the cluster */
377 #define EXT4_PBLK_CMASK(s, pblk) ((pblk) &				\
378 				  ~((ext4_fsblk_t) (s)->s_cluster_ratio - 1))
379 #define EXT4_LBLK_CMASK(s, lblk) ((lblk) &				\
380 				  ~((ext4_lblk_t) (s)->s_cluster_ratio - 1))
381 /* Fill in the low bits to get the last block of the cluster */
382 #define EXT4_LBLK_CFILL(sbi, lblk) ((lblk) |				\
383 				    ((ext4_lblk_t) (sbi)->s_cluster_ratio - 1))
384 /* Get the cluster offset */
385 #define EXT4_PBLK_COFF(s, pblk) ((pblk) &				\
386 				 ((ext4_fsblk_t) (s)->s_cluster_ratio - 1))
387 #define EXT4_LBLK_COFF(s, lblk) ((lblk) &				\
388 				 ((ext4_lblk_t) (s)->s_cluster_ratio - 1))
389 
390 /*
391  * Structure of a blocks group descriptor
392  */
393 struct ext4_group_desc
394 {
395 	__le32	bg_block_bitmap_lo;	/* Blocks bitmap block */
396 	__le32	bg_inode_bitmap_lo;	/* Inodes bitmap block */
397 	__le32	bg_inode_table_lo;	/* Inodes table block */
398 	__le16	bg_free_blocks_count_lo;/* Free blocks count */
399 	__le16	bg_free_inodes_count_lo;/* Free inodes count */
400 	__le16	bg_used_dirs_count_lo;	/* Directories count */
401 	__le16	bg_flags;		/* EXT4_BG_flags (INODE_UNINIT, etc) */
402 	__le32  bg_exclude_bitmap_lo;   /* Exclude bitmap for snapshots */
403 	__le16  bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bbitmap) LE */
404 	__le16  bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+ibitmap) LE */
405 	__le16  bg_itable_unused_lo;	/* Unused inodes count */
406 	__le16  bg_checksum;		/* crc16(sb_uuid+group+desc) */
407 	__le32	bg_block_bitmap_hi;	/* Blocks bitmap block MSB */
408 	__le32	bg_inode_bitmap_hi;	/* Inodes bitmap block MSB */
409 	__le32	bg_inode_table_hi;	/* Inodes table block MSB */
410 	__le16	bg_free_blocks_count_hi;/* Free blocks count MSB */
411 	__le16	bg_free_inodes_count_hi;/* Free inodes count MSB */
412 	__le16	bg_used_dirs_count_hi;	/* Directories count MSB */
413 	__le16  bg_itable_unused_hi;    /* Unused inodes count MSB */
414 	__le32  bg_exclude_bitmap_hi;   /* Exclude bitmap block MSB */
415 	__le16  bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bbitmap) BE */
416 	__le16  bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+ibitmap) BE */
417 	__u32   bg_reserved;
418 };
419 
420 #define EXT4_BG_INODE_BITMAP_CSUM_HI_END	\
421 	(offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \
422 	 sizeof(__le16))
423 #define EXT4_BG_BLOCK_BITMAP_CSUM_HI_END	\
424 	(offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \
425 	 sizeof(__le16))
426 
427 /*
428  * Structure of a flex block group info
429  */
430 
431 struct flex_groups {
432 	atomic64_t	free_clusters;
433 	atomic_t	free_inodes;
434 	atomic_t	used_dirs;
435 };
436 
437 #define EXT4_BG_INODE_UNINIT	0x0001 /* Inode table/bitmap not in use */
438 #define EXT4_BG_BLOCK_UNINIT	0x0002 /* Block bitmap not in use */
439 #define EXT4_BG_INODE_ZEROED	0x0004 /* On-disk itable initialized to zero */
440 
441 /*
442  * Macro-instructions used to manage group descriptors
443  */
444 #define EXT4_MIN_DESC_SIZE		32
445 #define EXT4_MIN_DESC_SIZE_64BIT	64
446 #define	EXT4_MAX_DESC_SIZE		EXT4_MIN_BLOCK_SIZE
447 #define EXT4_DESC_SIZE(s)		(EXT4_SB(s)->s_desc_size)
448 #ifdef __KERNEL__
449 # define EXT4_BLOCKS_PER_GROUP(s)	(EXT4_SB(s)->s_blocks_per_group)
450 # define EXT4_CLUSTERS_PER_GROUP(s)	(EXT4_SB(s)->s_clusters_per_group)
451 # define EXT4_DESC_PER_BLOCK(s)		(EXT4_SB(s)->s_desc_per_block)
452 # define EXT4_INODES_PER_GROUP(s)	(EXT4_SB(s)->s_inodes_per_group)
453 # define EXT4_DESC_PER_BLOCK_BITS(s)	(EXT4_SB(s)->s_desc_per_block_bits)
454 #else
455 # define EXT4_BLOCKS_PER_GROUP(s)	((s)->s_blocks_per_group)
456 # define EXT4_DESC_PER_BLOCK(s)		(EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
457 # define EXT4_INODES_PER_GROUP(s)	((s)->s_inodes_per_group)
458 #endif
459 
460 /*
461  * Constants relative to the data blocks
462  */
463 #define	EXT4_NDIR_BLOCKS		12
464 #define	EXT4_IND_BLOCK			EXT4_NDIR_BLOCKS
465 #define	EXT4_DIND_BLOCK			(EXT4_IND_BLOCK + 1)
466 #define	EXT4_TIND_BLOCK			(EXT4_DIND_BLOCK + 1)
467 #define	EXT4_N_BLOCKS			(EXT4_TIND_BLOCK + 1)
468 
469 /*
470  * Inode flags
471  */
472 #define	EXT4_SECRM_FL			0x00000001 /* Secure deletion */
473 #define	EXT4_UNRM_FL			0x00000002 /* Undelete */
474 #define	EXT4_COMPR_FL			0x00000004 /* Compress file */
475 #define EXT4_SYNC_FL			0x00000008 /* Synchronous updates */
476 #define EXT4_IMMUTABLE_FL		0x00000010 /* Immutable file */
477 #define EXT4_APPEND_FL			0x00000020 /* writes to file may only append */
478 #define EXT4_NODUMP_FL			0x00000040 /* do not dump file */
479 #define EXT4_NOATIME_FL			0x00000080 /* do not update atime */
480 /* Reserved for compression usage... */
481 #define EXT4_DIRTY_FL			0x00000100
482 #define EXT4_COMPRBLK_FL		0x00000200 /* One or more compressed clusters */
483 #define EXT4_NOCOMPR_FL			0x00000400 /* Don't compress */
484 	/* nb: was previously EXT2_ECOMPR_FL */
485 #define EXT4_ENCRYPT_FL			0x00000800 /* encrypted file */
486 /* End compression flags --- maybe not all used */
487 #define EXT4_INDEX_FL			0x00001000 /* hash-indexed directory */
488 #define EXT4_IMAGIC_FL			0x00002000 /* AFS directory */
489 #define EXT4_JOURNAL_DATA_FL		0x00004000 /* file data should be journaled */
490 #define EXT4_NOTAIL_FL			0x00008000 /* file tail should not be merged */
491 #define EXT4_DIRSYNC_FL			0x00010000 /* dirsync behaviour (directories only) */
492 #define EXT4_TOPDIR_FL			0x00020000 /* Top of directory hierarchies*/
493 #define EXT4_HUGE_FILE_FL               0x00040000 /* Set to each huge file */
494 #define EXT4_EXTENTS_FL			0x00080000 /* Inode uses extents */
495 #define EXT4_VERITY_FL			0x00100000 /* Verity protected inode */
496 #define EXT4_EA_INODE_FL	        0x00200000 /* Inode used for large EA */
497 /* 0x00400000 was formerly EXT4_EOFBLOCKS_FL */
498 
499 #define EXT4_DAX_FL			0x02000000 /* Inode is DAX */
500 
501 #define EXT4_INLINE_DATA_FL		0x10000000 /* Inode has inline data. */
502 #define EXT4_PROJINHERIT_FL		0x20000000 /* Create with parents projid */
503 #define EXT4_CASEFOLD_FL		0x40000000 /* Casefolded directory */
504 #define EXT4_RESERVED_FL		0x80000000 /* reserved for ext4 lib */
505 
506 /* User modifiable flags */
507 #define EXT4_FL_USER_MODIFIABLE		(EXT4_SECRM_FL | \
508 					 EXT4_UNRM_FL | \
509 					 EXT4_COMPR_FL | \
510 					 EXT4_SYNC_FL | \
511 					 EXT4_IMMUTABLE_FL | \
512 					 EXT4_APPEND_FL | \
513 					 EXT4_NODUMP_FL | \
514 					 EXT4_NOATIME_FL | \
515 					 EXT4_JOURNAL_DATA_FL | \
516 					 EXT4_NOTAIL_FL | \
517 					 EXT4_DIRSYNC_FL | \
518 					 EXT4_TOPDIR_FL | \
519 					 EXT4_EXTENTS_FL | \
520 					 0x00400000 /* EXT4_EOFBLOCKS_FL */ | \
521 					 EXT4_DAX_FL | \
522 					 EXT4_PROJINHERIT_FL | \
523 					 EXT4_CASEFOLD_FL)
524 
525 /* User visible flags */
526 #define EXT4_FL_USER_VISIBLE		(EXT4_FL_USER_MODIFIABLE | \
527 					 EXT4_DIRTY_FL | \
528 					 EXT4_COMPRBLK_FL | \
529 					 EXT4_NOCOMPR_FL | \
530 					 EXT4_ENCRYPT_FL | \
531 					 EXT4_INDEX_FL | \
532 					 EXT4_VERITY_FL | \
533 					 EXT4_INLINE_DATA_FL)
534 
535 /* Flags that should be inherited by new inodes from their parent. */
536 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\
537 			   EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\
538 			   EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\
539 			   EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL |\
540 			   EXT4_PROJINHERIT_FL | EXT4_CASEFOLD_FL |\
541 			   EXT4_DAX_FL)
542 
543 /* Flags that are appropriate for regular files (all but dir-specific ones). */
544 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL | EXT4_CASEFOLD_FL |\
545 			   EXT4_PROJINHERIT_FL))
546 
547 /* Flags that are appropriate for non-directories/regular files. */
548 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL)
549 
550 /* The only flags that should be swapped */
551 #define EXT4_FL_SHOULD_SWAP (EXT4_HUGE_FILE_FL | EXT4_EXTENTS_FL)
552 
553 /* Flags which are mutually exclusive to DAX */
554 #define EXT4_DAX_MUT_EXCL (EXT4_VERITY_FL | EXT4_ENCRYPT_FL |\
555 			   EXT4_JOURNAL_DATA_FL | EXT4_INLINE_DATA_FL)
556 
557 /* Mask out flags that are inappropriate for the given type of inode. */
558 static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags)
559 {
560 	if (S_ISDIR(mode))
561 		return flags;
562 	else if (S_ISREG(mode))
563 		return flags & EXT4_REG_FLMASK;
564 	else
565 		return flags & EXT4_OTHER_FLMASK;
566 }
567 
568 /*
569  * Inode flags used for atomic set/get
570  */
571 enum {
572 	EXT4_INODE_SECRM	= 0,	/* Secure deletion */
573 	EXT4_INODE_UNRM		= 1,	/* Undelete */
574 	EXT4_INODE_COMPR	= 2,	/* Compress file */
575 	EXT4_INODE_SYNC		= 3,	/* Synchronous updates */
576 	EXT4_INODE_IMMUTABLE	= 4,	/* Immutable file */
577 	EXT4_INODE_APPEND	= 5,	/* writes to file may only append */
578 	EXT4_INODE_NODUMP	= 6,	/* do not dump file */
579 	EXT4_INODE_NOATIME	= 7,	/* do not update atime */
580 /* Reserved for compression usage... */
581 	EXT4_INODE_DIRTY	= 8,
582 	EXT4_INODE_COMPRBLK	= 9,	/* One or more compressed clusters */
583 	EXT4_INODE_NOCOMPR	= 10,	/* Don't compress */
584 	EXT4_INODE_ENCRYPT	= 11,	/* Encrypted file */
585 /* End compression flags --- maybe not all used */
586 	EXT4_INODE_INDEX	= 12,	/* hash-indexed directory */
587 	EXT4_INODE_IMAGIC	= 13,	/* AFS directory */
588 	EXT4_INODE_JOURNAL_DATA	= 14,	/* file data should be journaled */
589 	EXT4_INODE_NOTAIL	= 15,	/* file tail should not be merged */
590 	EXT4_INODE_DIRSYNC	= 16,	/* dirsync behaviour (directories only) */
591 	EXT4_INODE_TOPDIR	= 17,	/* Top of directory hierarchies*/
592 	EXT4_INODE_HUGE_FILE	= 18,	/* Set to each huge file */
593 	EXT4_INODE_EXTENTS	= 19,	/* Inode uses extents */
594 	EXT4_INODE_VERITY	= 20,	/* Verity protected inode */
595 	EXT4_INODE_EA_INODE	= 21,	/* Inode used for large EA */
596 /* 22 was formerly EXT4_INODE_EOFBLOCKS */
597 	EXT4_INODE_DAX		= 25,	/* Inode is DAX */
598 	EXT4_INODE_INLINE_DATA	= 28,	/* Data in inode. */
599 	EXT4_INODE_PROJINHERIT	= 29,	/* Create with parents projid */
600 	EXT4_INODE_CASEFOLD	= 30,	/* Casefolded directory */
601 	EXT4_INODE_RESERVED	= 31,	/* reserved for ext4 lib */
602 };
603 
604 /*
605  * Since it's pretty easy to mix up bit numbers and hex values, we use a
606  * build-time check to make sure that EXT4_XXX_FL is consistent with respect to
607  * EXT4_INODE_XXX. If all is well, the macros will be dropped, so, it won't cost
608  * any extra space in the compiled kernel image, otherwise, the build will fail.
609  * It's important that these values are the same, since we are using
610  * EXT4_INODE_XXX to test for flag values, but EXT4_XXX_FL must be consistent
611  * with the values of FS_XXX_FL defined in include/linux/fs.h and the on-disk
612  * values found in ext2, ext3 and ext4 filesystems, and of course the values
613  * defined in e2fsprogs.
614  *
615  * It's not paranoia if the Murphy's Law really *is* out to get you.  :-)
616  */
617 #define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1U << EXT4_INODE_##FLAG))
618 #define CHECK_FLAG_VALUE(FLAG) BUILD_BUG_ON(!TEST_FLAG_VALUE(FLAG))
619 
620 static inline void ext4_check_flag_values(void)
621 {
622 	CHECK_FLAG_VALUE(SECRM);
623 	CHECK_FLAG_VALUE(UNRM);
624 	CHECK_FLAG_VALUE(COMPR);
625 	CHECK_FLAG_VALUE(SYNC);
626 	CHECK_FLAG_VALUE(IMMUTABLE);
627 	CHECK_FLAG_VALUE(APPEND);
628 	CHECK_FLAG_VALUE(NODUMP);
629 	CHECK_FLAG_VALUE(NOATIME);
630 	CHECK_FLAG_VALUE(DIRTY);
631 	CHECK_FLAG_VALUE(COMPRBLK);
632 	CHECK_FLAG_VALUE(NOCOMPR);
633 	CHECK_FLAG_VALUE(ENCRYPT);
634 	CHECK_FLAG_VALUE(INDEX);
635 	CHECK_FLAG_VALUE(IMAGIC);
636 	CHECK_FLAG_VALUE(JOURNAL_DATA);
637 	CHECK_FLAG_VALUE(NOTAIL);
638 	CHECK_FLAG_VALUE(DIRSYNC);
639 	CHECK_FLAG_VALUE(TOPDIR);
640 	CHECK_FLAG_VALUE(HUGE_FILE);
641 	CHECK_FLAG_VALUE(EXTENTS);
642 	CHECK_FLAG_VALUE(VERITY);
643 	CHECK_FLAG_VALUE(EA_INODE);
644 	CHECK_FLAG_VALUE(INLINE_DATA);
645 	CHECK_FLAG_VALUE(PROJINHERIT);
646 	CHECK_FLAG_VALUE(CASEFOLD);
647 	CHECK_FLAG_VALUE(RESERVED);
648 }
649 
650 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
651 struct compat_ext4_new_group_input {
652 	u32 group;
653 	compat_u64 block_bitmap;
654 	compat_u64 inode_bitmap;
655 	compat_u64 inode_table;
656 	u32 blocks_count;
657 	u16 reserved_blocks;
658 	u16 unused;
659 };
660 #endif
661 
662 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */
663 struct ext4_new_group_data {
664 	__u32 group;
665 	__u64 block_bitmap;
666 	__u64 inode_bitmap;
667 	__u64 inode_table;
668 	__u32 blocks_count;
669 	__u16 reserved_blocks;
670 	__u16 mdata_blocks;
671 	__u32 free_clusters_count;
672 };
673 
674 /* Indexes used to index group tables in ext4_new_group_data */
675 enum {
676 	BLOCK_BITMAP = 0,	/* block bitmap */
677 	INODE_BITMAP,		/* inode bitmap */
678 	INODE_TABLE,		/* inode tables */
679 	GROUP_TABLE_COUNT,
680 };
681 
682 /*
683  * Flags used by ext4_map_blocks()
684  */
685 	/* Allocate any needed blocks and/or convert an unwritten
686 	   extent to be an initialized ext4 */
687 #define EXT4_GET_BLOCKS_CREATE			0x0001
688 	/* Request the creation of an unwritten extent */
689 #define EXT4_GET_BLOCKS_UNWRIT_EXT		0x0002
690 #define EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT	(EXT4_GET_BLOCKS_UNWRIT_EXT|\
691 						 EXT4_GET_BLOCKS_CREATE)
692 	/* Caller is from the delayed allocation writeout path
693 	 * finally doing the actual allocation of delayed blocks */
694 #define EXT4_GET_BLOCKS_DELALLOC_RESERVE	0x0004
695 	/* caller is from the direct IO path, request to creation of an
696 	unwritten extents if not allocated, split the unwritten
697 	extent if blocks has been preallocated already*/
698 #define EXT4_GET_BLOCKS_PRE_IO			0x0008
699 #define EXT4_GET_BLOCKS_CONVERT			0x0010
700 #define EXT4_GET_BLOCKS_IO_CREATE_EXT		(EXT4_GET_BLOCKS_PRE_IO|\
701 					 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT)
702 	/* Convert extent to initialized after IO complete */
703 #define EXT4_GET_BLOCKS_IO_CONVERT_EXT		(EXT4_GET_BLOCKS_CONVERT|\
704 					 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT)
705 	/* Eventual metadata allocation (due to growing extent tree)
706 	 * should not fail, so try to use reserved blocks for that.*/
707 #define EXT4_GET_BLOCKS_METADATA_NOFAIL		0x0020
708 	/* Don't normalize allocation size (used for fallocate) */
709 #define EXT4_GET_BLOCKS_NO_NORMALIZE		0x0040
710 	/* Convert written extents to unwritten */
711 #define EXT4_GET_BLOCKS_CONVERT_UNWRITTEN	0x0100
712 	/* Write zeros to newly created written extents */
713 #define EXT4_GET_BLOCKS_ZERO			0x0200
714 #define EXT4_GET_BLOCKS_CREATE_ZERO		(EXT4_GET_BLOCKS_CREATE |\
715 					EXT4_GET_BLOCKS_ZERO)
716 	/* Caller will submit data before dropping transaction handle. This
717 	 * allows jbd2 to avoid submitting data before commit. */
718 #define EXT4_GET_BLOCKS_IO_SUBMIT		0x0400
719 	/* Caller is in the atomic contex, find extent if it has been cached */
720 #define EXT4_GET_BLOCKS_CACHED_NOWAIT		0x0800
721 
722 /*
723  * The bit position of these flags must not overlap with any of the
724  * EXT4_GET_BLOCKS_*.  They are used by ext4_find_extent(),
725  * read_extent_tree_block(), ext4_split_extent_at(),
726  * ext4_ext_insert_extent(), and ext4_ext_create_new_leaf().
727  * EXT4_EX_NOCACHE is used to indicate that the we shouldn't be
728  * caching the extents when reading from the extent tree while a
729  * truncate or punch hole operation is in progress.
730  */
731 #define EXT4_EX_NOCACHE				0x40000000
732 #define EXT4_EX_FORCE_CACHE			0x20000000
733 #define EXT4_EX_NOFAIL				0x10000000
734 
735 /*
736  * Flags used by ext4_free_blocks
737  */
738 #define EXT4_FREE_BLOCKS_METADATA		0x0001
739 #define EXT4_FREE_BLOCKS_FORGET			0x0002
740 #define EXT4_FREE_BLOCKS_VALIDATED		0x0004
741 #define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE		0x0008
742 #define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER	0x0010
743 #define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER	0x0020
744 #define EXT4_FREE_BLOCKS_RERESERVE_CLUSTER      0x0040
745 
746 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
747 /*
748  * ioctl commands in 32 bit emulation
749  */
750 #define EXT4_IOC32_GETVERSION		_IOR('f', 3, int)
751 #define EXT4_IOC32_SETVERSION		_IOW('f', 4, int)
752 #define EXT4_IOC32_GETRSVSZ		_IOR('f', 5, int)
753 #define EXT4_IOC32_SETRSVSZ		_IOW('f', 6, int)
754 #define EXT4_IOC32_GROUP_EXTEND		_IOW('f', 7, unsigned int)
755 #define EXT4_IOC32_GROUP_ADD		_IOW('f', 8, struct compat_ext4_new_group_input)
756 #define EXT4_IOC32_GETVERSION_OLD	FS_IOC32_GETVERSION
757 #define EXT4_IOC32_SETVERSION_OLD	FS_IOC32_SETVERSION
758 #endif
759 
760 /* Max physical block we can address w/o extents */
761 #define EXT4_MAX_BLOCK_FILE_PHYS	0xFFFFFFFF
762 
763 /* Max logical block we can support */
764 #define EXT4_MAX_LOGICAL_BLOCK		0xFFFFFFFE
765 
766 /*
767  * Structure of an inode on the disk
768  */
769 struct ext4_inode {
770 	__le16	i_mode;		/* File mode */
771 	__le16	i_uid;		/* Low 16 bits of Owner Uid */
772 	__le32	i_size_lo;	/* Size in bytes */
773 	__le32	i_atime;	/* Access time */
774 	__le32	i_ctime;	/* Inode Change time */
775 	__le32	i_mtime;	/* Modification time */
776 	__le32	i_dtime;	/* Deletion Time */
777 	__le16	i_gid;		/* Low 16 bits of Group Id */
778 	__le16	i_links_count;	/* Links count */
779 	__le32	i_blocks_lo;	/* Blocks count */
780 	__le32	i_flags;	/* File flags */
781 	union {
782 		struct {
783 			__le32  l_i_version;
784 		} linux1;
785 		struct {
786 			__u32  h_i_translator;
787 		} hurd1;
788 		struct {
789 			__u32  m_i_reserved1;
790 		} masix1;
791 	} osd1;				/* OS dependent 1 */
792 	__le32	i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
793 	__le32	i_generation;	/* File version (for NFS) */
794 	__le32	i_file_acl_lo;	/* File ACL */
795 	__le32	i_size_high;
796 	__le32	i_obso_faddr;	/* Obsoleted fragment address */
797 	union {
798 		struct {
799 			__le16	l_i_blocks_high; /* were l_i_reserved1 */
800 			__le16	l_i_file_acl_high;
801 			__le16	l_i_uid_high;	/* these 2 fields */
802 			__le16	l_i_gid_high;	/* were reserved2[0] */
803 			__le16	l_i_checksum_lo;/* crc32c(uuid+inum+inode) LE */
804 			__le16	l_i_reserved;
805 		} linux2;
806 		struct {
807 			__le16	h_i_reserved1;	/* Obsoleted fragment number/size which are removed in ext4 */
808 			__u16	h_i_mode_high;
809 			__u16	h_i_uid_high;
810 			__u16	h_i_gid_high;
811 			__u32	h_i_author;
812 		} hurd2;
813 		struct {
814 			__le16	h_i_reserved1;	/* Obsoleted fragment number/size which are removed in ext4 */
815 			__le16	m_i_file_acl_high;
816 			__u32	m_i_reserved2[2];
817 		} masix2;
818 	} osd2;				/* OS dependent 2 */
819 	__le16	i_extra_isize;
820 	__le16	i_checksum_hi;	/* crc32c(uuid+inum+inode) BE */
821 	__le32  i_ctime_extra;  /* extra Change time      (nsec << 2 | epoch) */
822 	__le32  i_mtime_extra;  /* extra Modification time(nsec << 2 | epoch) */
823 	__le32  i_atime_extra;  /* extra Access time      (nsec << 2 | epoch) */
824 	__le32  i_crtime;       /* File Creation time */
825 	__le32  i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */
826 	__le32  i_version_hi;	/* high 32 bits for 64-bit version */
827 	__le32	i_projid;	/* Project ID */
828 };
829 
830 #define EXT4_EPOCH_BITS 2
831 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
832 #define EXT4_NSEC_MASK  (~0UL << EXT4_EPOCH_BITS)
833 
834 /*
835  * Extended fields will fit into an inode if the filesystem was formatted
836  * with large inodes (-I 256 or larger) and there are not currently any EAs
837  * consuming all of the available space. For new inodes we always reserve
838  * enough space for the kernel's known extended fields, but for inodes
839  * created with an old kernel this might not have been the case. None of
840  * the extended inode fields is critical for correct filesystem operation.
841  * This macro checks if a certain field fits in the inode. Note that
842  * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
843  */
844 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field)	\
845 	((offsetof(typeof(*ext4_inode), field) +	\
846 	  sizeof((ext4_inode)->field))			\
847 	<= (EXT4_GOOD_OLD_INODE_SIZE +			\
848 	    (einode)->i_extra_isize))			\
849 
850 /*
851  * We use an encoding that preserves the times for extra epoch "00":
852  *
853  * extra  msb of                         adjust for signed
854  * epoch  32-bit                         32-bit tv_sec to
855  * bits   time    decoded 64-bit tv_sec  64-bit tv_sec      valid time range
856  * 0 0    1    -0x80000000..-0x00000001  0x000000000 1901-12-13..1969-12-31
857  * 0 0    0    0x000000000..0x07fffffff  0x000000000 1970-01-01..2038-01-19
858  * 0 1    1    0x080000000..0x0ffffffff  0x100000000 2038-01-19..2106-02-07
859  * 0 1    0    0x100000000..0x17fffffff  0x100000000 2106-02-07..2174-02-25
860  * 1 0    1    0x180000000..0x1ffffffff  0x200000000 2174-02-25..2242-03-16
861  * 1 0    0    0x200000000..0x27fffffff  0x200000000 2242-03-16..2310-04-04
862  * 1 1    1    0x280000000..0x2ffffffff  0x300000000 2310-04-04..2378-04-22
863  * 1 1    0    0x300000000..0x37fffffff  0x300000000 2378-04-22..2446-05-10
864  *
865  * Note that previous versions of the kernel on 64-bit systems would
866  * incorrectly use extra epoch bits 1,1 for dates between 1901 and
867  * 1970.  e2fsck will correct this, assuming that it is run on the
868  * affected filesystem before 2242.
869  */
870 
871 static inline __le32 ext4_encode_extra_time(struct timespec64 *time)
872 {
873 	u32 extra =((time->tv_sec - (s32)time->tv_sec) >> 32) & EXT4_EPOCH_MASK;
874 	return cpu_to_le32(extra | (time->tv_nsec << EXT4_EPOCH_BITS));
875 }
876 
877 static inline void ext4_decode_extra_time(struct timespec64 *time,
878 					  __le32 extra)
879 {
880 	if (unlikely(extra & cpu_to_le32(EXT4_EPOCH_MASK)))
881 		time->tv_sec += (u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) << 32;
882 	time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS;
883 }
884 
885 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode)				\
886 do {										\
887 	if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra))     {\
888 		(raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec);	\
889 		(raw_inode)->xtime ## _extra =					\
890 				ext4_encode_extra_time(&(inode)->xtime);	\
891 		}								\
892 	else	\
893 		(raw_inode)->xtime = cpu_to_le32(clamp_t(int32_t, (inode)->xtime.tv_sec, S32_MIN, S32_MAX));	\
894 } while (0)
895 
896 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode)			       \
897 do {									       \
898 	if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime))		       \
899 		(raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec);      \
900 	if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra))	       \
901 		(raw_inode)->xtime ## _extra =				       \
902 				ext4_encode_extra_time(&(einode)->xtime);      \
903 } while (0)
904 
905 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode)				\
906 do {										\
907 	(inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime);	\
908 	if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) {	\
909 		ext4_decode_extra_time(&(inode)->xtime,				\
910 				       raw_inode->xtime ## _extra);		\
911 		}								\
912 	else									\
913 		(inode)->xtime.tv_nsec = 0;					\
914 } while (0)
915 
916 
917 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode)			       \
918 do {									       \
919 	if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime))		       \
920 		(einode)->xtime.tv_sec = 				       \
921 			(signed)le32_to_cpu((raw_inode)->xtime);	       \
922 	else								       \
923 		(einode)->xtime.tv_sec = 0;				       \
924 	if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra))	       \
925 		ext4_decode_extra_time(&(einode)->xtime,		       \
926 				       raw_inode->xtime ## _extra);	       \
927 	else								       \
928 		(einode)->xtime.tv_nsec = 0;				       \
929 } while (0)
930 
931 #define i_disk_version osd1.linux1.l_i_version
932 
933 #if defined(__KERNEL__) || defined(__linux__)
934 #define i_reserved1	osd1.linux1.l_i_reserved1
935 #define i_file_acl_high	osd2.linux2.l_i_file_acl_high
936 #define i_blocks_high	osd2.linux2.l_i_blocks_high
937 #define i_uid_low	i_uid
938 #define i_gid_low	i_gid
939 #define i_uid_high	osd2.linux2.l_i_uid_high
940 #define i_gid_high	osd2.linux2.l_i_gid_high
941 #define i_checksum_lo	osd2.linux2.l_i_checksum_lo
942 
943 #elif defined(__GNU__)
944 
945 #define i_translator	osd1.hurd1.h_i_translator
946 #define i_uid_high	osd2.hurd2.h_i_uid_high
947 #define i_gid_high	osd2.hurd2.h_i_gid_high
948 #define i_author	osd2.hurd2.h_i_author
949 
950 #elif defined(__masix__)
951 
952 #define i_reserved1	osd1.masix1.m_i_reserved1
953 #define i_file_acl_high	osd2.masix2.m_i_file_acl_high
954 #define i_reserved2	osd2.masix2.m_i_reserved2
955 
956 #endif /* defined(__KERNEL__) || defined(__linux__) */
957 
958 #include "extents_status.h"
959 #include "fast_commit.h"
960 
961 /*
962  * Lock subclasses for i_data_sem in the ext4_inode_info structure.
963  *
964  * These are needed to avoid lockdep false positives when we need to
965  * allocate blocks to the quota inode during ext4_map_blocks(), while
966  * holding i_data_sem for a normal (non-quota) inode.  Since we don't
967  * do quota tracking for the quota inode, this avoids deadlock (as
968  * well as infinite recursion, since it isn't turtles all the way
969  * down...)
970  *
971  *  I_DATA_SEM_NORMAL - Used for most inodes
972  *  I_DATA_SEM_OTHER  - Used by move_inode.c for the second normal inode
973  *			  where the second inode has larger inode number
974  *			  than the first
975  *  I_DATA_SEM_QUOTA  - Used for quota inodes only
976  *  I_DATA_SEM_EA     - Used for ea_inodes only
977  */
978 enum {
979 	I_DATA_SEM_NORMAL = 0,
980 	I_DATA_SEM_OTHER,
981 	I_DATA_SEM_QUOTA,
982 	I_DATA_SEM_EA
983 };
984 
985 
986 /*
987  * fourth extended file system inode data in memory
988  */
989 struct ext4_inode_info {
990 	__le32	i_data[15];	/* unconverted */
991 	__u32	i_dtime;
992 	ext4_fsblk_t	i_file_acl;
993 
994 	/*
995 	 * i_block_group is the number of the block group which contains
996 	 * this file's inode.  Constant across the lifetime of the inode,
997 	 * it is used for making block allocation decisions - we try to
998 	 * place a file's data blocks near its inode block, and new inodes
999 	 * near to their parent directory's inode.
1000 	 */
1001 	ext4_group_t	i_block_group;
1002 	ext4_lblk_t	i_dir_start_lookup;
1003 #if (BITS_PER_LONG < 64)
1004 	unsigned long	i_state_flags;		/* Dynamic state flags */
1005 #endif
1006 	unsigned long	i_flags;
1007 
1008 	/*
1009 	 * Extended attributes can be read independently of the main file
1010 	 * data. Taking i_rwsem even when reading would cause contention
1011 	 * between readers of EAs and writers of regular file data, so
1012 	 * instead we synchronize on xattr_sem when reading or changing
1013 	 * EAs.
1014 	 */
1015 	struct rw_semaphore xattr_sem;
1016 
1017 	/*
1018 	 * Inodes with EXT4_STATE_ORPHAN_FILE use i_orphan_idx. Otherwise
1019 	 * i_orphan is used.
1020 	 */
1021 	union {
1022 		struct list_head i_orphan;	/* unlinked but open inodes */
1023 		unsigned int i_orphan_idx;	/* Index in orphan file */
1024 	};
1025 
1026 	/* Fast commit related info */
1027 
1028 	/* For tracking dentry create updates */
1029 	struct list_head i_fc_dilist;
1030 	struct list_head i_fc_list;	/*
1031 					 * inodes that need fast commit
1032 					 * protected by sbi->s_fc_lock.
1033 					 */
1034 
1035 	/* Start of lblk range that needs to be committed in this fast commit */
1036 	ext4_lblk_t i_fc_lblk_start;
1037 
1038 	/* End of lblk range that needs to be committed in this fast commit */
1039 	ext4_lblk_t i_fc_lblk_len;
1040 
1041 	/* Number of ongoing updates on this inode */
1042 	atomic_t  i_fc_updates;
1043 
1044 	/* Fast commit wait queue for this inode */
1045 	wait_queue_head_t i_fc_wait;
1046 
1047 	/* Protect concurrent accesses on i_fc_lblk_start, i_fc_lblk_len */
1048 	struct mutex i_fc_lock;
1049 
1050 	/*
1051 	 * i_disksize keeps track of what the inode size is ON DISK, not
1052 	 * in memory.  During truncate, i_size is set to the new size by
1053 	 * the VFS prior to calling ext4_truncate(), but the filesystem won't
1054 	 * set i_disksize to 0 until the truncate is actually under way.
1055 	 *
1056 	 * The intent is that i_disksize always represents the blocks which
1057 	 * are used by this file.  This allows recovery to restart truncate
1058 	 * on orphans if we crash during truncate.  We actually write i_disksize
1059 	 * into the on-disk inode when writing inodes out, instead of i_size.
1060 	 *
1061 	 * The only time when i_disksize and i_size may be different is when
1062 	 * a truncate is in progress.  The only things which change i_disksize
1063 	 * are ext4_get_block (growth) and ext4_truncate (shrinkth).
1064 	 */
1065 	loff_t	i_disksize;
1066 
1067 	/*
1068 	 * i_data_sem is for serialising ext4_truncate() against
1069 	 * ext4_getblock().  In the 2.4 ext2 design, great chunks of inode's
1070 	 * data tree are chopped off during truncate. We can't do that in
1071 	 * ext4 because whenever we perform intermediate commits during
1072 	 * truncate, the inode and all the metadata blocks *must* be in a
1073 	 * consistent state which allows truncation of the orphans to restart
1074 	 * during recovery.  Hence we must fix the get_block-vs-truncate race
1075 	 * by other means, so we have i_data_sem.
1076 	 */
1077 	struct rw_semaphore i_data_sem;
1078 	struct inode vfs_inode;
1079 	struct jbd2_inode *jinode;
1080 
1081 	spinlock_t i_raw_lock;	/* protects updates to the raw inode */
1082 
1083 	/*
1084 	 * File creation time. Its function is same as that of
1085 	 * struct timespec64 i_{a,c,m}time in the generic inode.
1086 	 */
1087 	struct timespec64 i_crtime;
1088 
1089 	/* mballoc */
1090 	atomic_t i_prealloc_active;
1091 	struct rb_root i_prealloc_node;
1092 	rwlock_t i_prealloc_lock;
1093 
1094 	/* extents status tree */
1095 	struct ext4_es_tree i_es_tree;
1096 	rwlock_t i_es_lock;
1097 	struct list_head i_es_list;
1098 	unsigned int i_es_all_nr;	/* protected by i_es_lock */
1099 	unsigned int i_es_shk_nr;	/* protected by i_es_lock */
1100 	ext4_lblk_t i_es_shrink_lblk;	/* Offset where we start searching for
1101 					   extents to shrink. Protected by
1102 					   i_es_lock  */
1103 
1104 	/* ialloc */
1105 	ext4_group_t	i_last_alloc_group;
1106 
1107 	/* allocation reservation info for delalloc */
1108 	/* In case of bigalloc, this refer to clusters rather than blocks */
1109 	unsigned int i_reserved_data_blocks;
1110 
1111 	/* pending cluster reservations for bigalloc file systems */
1112 	struct ext4_pending_tree i_pending_tree;
1113 
1114 	/* on-disk additional length */
1115 	__u16 i_extra_isize;
1116 
1117 	/* Indicate the inline data space. */
1118 	u16 i_inline_off;
1119 	u16 i_inline_size;
1120 
1121 #ifdef CONFIG_QUOTA
1122 	/* quota space reservation, managed internally by quota code */
1123 	qsize_t i_reserved_quota;
1124 #endif
1125 
1126 	/* Lock protecting lists below */
1127 	spinlock_t i_completed_io_lock;
1128 	/*
1129 	 * Completed IOs that need unwritten extents handling and have
1130 	 * transaction reserved
1131 	 */
1132 	struct list_head i_rsv_conversion_list;
1133 	struct work_struct i_rsv_conversion_work;
1134 	atomic_t i_unwritten; /* Nr. of inflight conversions pending */
1135 
1136 	spinlock_t i_block_reservation_lock;
1137 
1138 	/*
1139 	 * Transactions that contain inode's metadata needed to complete
1140 	 * fsync and fdatasync, respectively.
1141 	 */
1142 	tid_t i_sync_tid;
1143 	tid_t i_datasync_tid;
1144 
1145 #ifdef CONFIG_QUOTA
1146 	struct dquot *i_dquot[MAXQUOTAS];
1147 #endif
1148 
1149 	/* Precomputed uuid+inum+igen checksum for seeding inode checksums */
1150 	__u32 i_csum_seed;
1151 
1152 	kprojid_t i_projid;
1153 };
1154 
1155 /*
1156  * File system states
1157  */
1158 #define	EXT4_VALID_FS			0x0001	/* Unmounted cleanly */
1159 #define	EXT4_ERROR_FS			0x0002	/* Errors detected */
1160 #define	EXT4_ORPHAN_FS			0x0004	/* Orphans being recovered */
1161 #define EXT4_FC_REPLAY			0x0020	/* Fast commit replay ongoing */
1162 
1163 /*
1164  * Misc. filesystem flags
1165  */
1166 #define EXT2_FLAGS_SIGNED_HASH		0x0001  /* Signed dirhash in use */
1167 #define EXT2_FLAGS_UNSIGNED_HASH	0x0002  /* Unsigned dirhash in use */
1168 #define EXT2_FLAGS_TEST_FILESYS		0x0004	/* to test development code */
1169 
1170 /*
1171  * Mount flags set via mount options or defaults
1172  */
1173 #define EXT4_MOUNT_NO_MBCACHE		0x00001 /* Do not use mbcache */
1174 #define EXT4_MOUNT_GRPID		0x00004	/* Create files with directory's group */
1175 #define EXT4_MOUNT_DEBUG		0x00008	/* Some debugging messages */
1176 #define EXT4_MOUNT_ERRORS_CONT		0x00010	/* Continue on errors */
1177 #define EXT4_MOUNT_ERRORS_RO		0x00020	/* Remount fs ro on errors */
1178 #define EXT4_MOUNT_ERRORS_PANIC		0x00040	/* Panic on errors */
1179 #define EXT4_MOUNT_ERRORS_MASK		0x00070
1180 #define EXT4_MOUNT_MINIX_DF		0x00080	/* Mimics the Minix statfs */
1181 #define EXT4_MOUNT_NOLOAD		0x00100	/* Don't use existing journal*/
1182 #ifdef CONFIG_FS_DAX
1183 #define EXT4_MOUNT_DAX_ALWAYS		0x00200	/* Direct Access */
1184 #else
1185 #define EXT4_MOUNT_DAX_ALWAYS		0
1186 #endif
1187 #define EXT4_MOUNT_DATA_FLAGS		0x00C00	/* Mode for data writes: */
1188 #define EXT4_MOUNT_JOURNAL_DATA		0x00400	/* Write data to journal */
1189 #define EXT4_MOUNT_ORDERED_DATA		0x00800	/* Flush data before commit */
1190 #define EXT4_MOUNT_WRITEBACK_DATA	0x00C00	/* No data ordering */
1191 #define EXT4_MOUNT_UPDATE_JOURNAL	0x01000	/* Update the journal format */
1192 #define EXT4_MOUNT_NO_UID32		0x02000  /* Disable 32-bit UIDs */
1193 #define EXT4_MOUNT_XATTR_USER		0x04000	/* Extended user attributes */
1194 #define EXT4_MOUNT_POSIX_ACL		0x08000	/* POSIX Access Control Lists */
1195 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC	0x10000	/* No auto delalloc mapping */
1196 #define EXT4_MOUNT_BARRIER		0x20000 /* Use block barriers */
1197 #define EXT4_MOUNT_QUOTA		0x40000 /* Some quota option set */
1198 #define EXT4_MOUNT_USRQUOTA		0x80000 /* "old" user quota,
1199 						 * enable enforcement for hidden
1200 						 * quota files */
1201 #define EXT4_MOUNT_GRPQUOTA		0x100000 /* "old" group quota, enable
1202 						  * enforcement for hidden quota
1203 						  * files */
1204 #define EXT4_MOUNT_PRJQUOTA		0x200000 /* Enable project quota
1205 						  * enforcement */
1206 #define EXT4_MOUNT_DIOREAD_NOLOCK	0x400000 /* Enable support for dio read nolocking */
1207 #define EXT4_MOUNT_JOURNAL_CHECKSUM	0x800000 /* Journal checksums */
1208 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT	0x1000000 /* Journal Async Commit */
1209 #define EXT4_MOUNT_WARN_ON_ERROR	0x2000000 /* Trigger WARN_ON on error */
1210 #define EXT4_MOUNT_NO_PREFETCH_BLOCK_BITMAPS 0x4000000
1211 #define EXT4_MOUNT_DELALLOC		0x8000000 /* Delalloc support */
1212 #define EXT4_MOUNT_DATA_ERR_ABORT	0x10000000 /* Abort on file data write */
1213 #define EXT4_MOUNT_BLOCK_VALIDITY	0x20000000 /* Block validity checking */
1214 #define EXT4_MOUNT_DISCARD		0x40000000 /* Issue DISCARD requests */
1215 #define EXT4_MOUNT_INIT_INODE_TABLE	0x80000000 /* Initialize uninitialized itables */
1216 
1217 /*
1218  * Mount flags set either automatically (could not be set by mount option)
1219  * based on per file system feature or property or in special cases such as
1220  * distinguishing between explicit mount option definition and default.
1221  */
1222 #define EXT4_MOUNT2_EXPLICIT_DELALLOC	0x00000001 /* User explicitly
1223 						      specified delalloc */
1224 #define EXT4_MOUNT2_STD_GROUP_SIZE	0x00000002 /* We have standard group
1225 						      size of blocksize * 8
1226 						      blocks */
1227 #define EXT4_MOUNT2_HURD_COMPAT		0x00000004 /* Support HURD-castrated
1228 						      file systems */
1229 #define EXT4_MOUNT2_EXPLICIT_JOURNAL_CHECKSUM	0x00000008 /* User explicitly
1230 						specified journal checksum */
1231 
1232 #define EXT4_MOUNT2_JOURNAL_FAST_COMMIT	0x00000010 /* Journal fast commit */
1233 #define EXT4_MOUNT2_DAX_NEVER		0x00000020 /* Do not allow Direct Access */
1234 #define EXT4_MOUNT2_DAX_INODE		0x00000040 /* For printing options only */
1235 #define EXT4_MOUNT2_MB_OPTIMIZE_SCAN	0x00000080 /* Optimize group
1236 						    * scanning in mballoc
1237 						    */
1238 
1239 #define clear_opt(sb, opt)		EXT4_SB(sb)->s_mount_opt &= \
1240 						~EXT4_MOUNT_##opt
1241 #define set_opt(sb, opt)		EXT4_SB(sb)->s_mount_opt |= \
1242 						EXT4_MOUNT_##opt
1243 #define test_opt(sb, opt)		(EXT4_SB(sb)->s_mount_opt & \
1244 					 EXT4_MOUNT_##opt)
1245 
1246 #define clear_opt2(sb, opt)		EXT4_SB(sb)->s_mount_opt2 &= \
1247 						~EXT4_MOUNT2_##opt
1248 #define set_opt2(sb, opt)		EXT4_SB(sb)->s_mount_opt2 |= \
1249 						EXT4_MOUNT2_##opt
1250 #define test_opt2(sb, opt)		(EXT4_SB(sb)->s_mount_opt2 & \
1251 					 EXT4_MOUNT2_##opt)
1252 
1253 #define ext4_test_and_set_bit		__test_and_set_bit_le
1254 #define ext4_set_bit			__set_bit_le
1255 #define ext4_set_bit_atomic		ext2_set_bit_atomic
1256 #define ext4_test_and_clear_bit		__test_and_clear_bit_le
1257 #define ext4_clear_bit			__clear_bit_le
1258 #define ext4_clear_bit_atomic		ext2_clear_bit_atomic
1259 #define ext4_test_bit			test_bit_le
1260 #define ext4_find_next_zero_bit		find_next_zero_bit_le
1261 #define ext4_find_next_bit		find_next_bit_le
1262 
1263 extern void mb_set_bits(void *bm, int cur, int len);
1264 
1265 /*
1266  * Maximal mount counts between two filesystem checks
1267  */
1268 #define EXT4_DFL_MAX_MNT_COUNT		20	/* Allow 20 mounts */
1269 #define EXT4_DFL_CHECKINTERVAL		0	/* Don't use interval check */
1270 
1271 /*
1272  * Behaviour when detecting errors
1273  */
1274 #define EXT4_ERRORS_CONTINUE		1	/* Continue execution */
1275 #define EXT4_ERRORS_RO			2	/* Remount fs read-only */
1276 #define EXT4_ERRORS_PANIC		3	/* Panic */
1277 #define EXT4_ERRORS_DEFAULT		EXT4_ERRORS_CONTINUE
1278 
1279 /* Metadata checksum algorithm codes */
1280 #define EXT4_CRC32C_CHKSUM		1
1281 
1282 #define EXT4_LABEL_MAX			16
1283 
1284 /*
1285  * Structure of the super block
1286  */
1287 struct ext4_super_block {
1288 /*00*/	__le32	s_inodes_count;		/* Inodes count */
1289 	__le32	s_blocks_count_lo;	/* Blocks count */
1290 	__le32	s_r_blocks_count_lo;	/* Reserved blocks count */
1291 	__le32	s_free_blocks_count_lo;	/* Free blocks count */
1292 /*10*/	__le32	s_free_inodes_count;	/* Free inodes count */
1293 	__le32	s_first_data_block;	/* First Data Block */
1294 	__le32	s_log_block_size;	/* Block size */
1295 	__le32	s_log_cluster_size;	/* Allocation cluster size */
1296 /*20*/	__le32	s_blocks_per_group;	/* # Blocks per group */
1297 	__le32	s_clusters_per_group;	/* # Clusters per group */
1298 	__le32	s_inodes_per_group;	/* # Inodes per group */
1299 	__le32	s_mtime;		/* Mount time */
1300 /*30*/	__le32	s_wtime;		/* Write time */
1301 	__le16	s_mnt_count;		/* Mount count */
1302 	__le16	s_max_mnt_count;	/* Maximal mount count */
1303 	__le16	s_magic;		/* Magic signature */
1304 	__le16	s_state;		/* File system state */
1305 	__le16	s_errors;		/* Behaviour when detecting errors */
1306 	__le16	s_minor_rev_level;	/* minor revision level */
1307 /*40*/	__le32	s_lastcheck;		/* time of last check */
1308 	__le32	s_checkinterval;	/* max. time between checks */
1309 	__le32	s_creator_os;		/* OS */
1310 	__le32	s_rev_level;		/* Revision level */
1311 /*50*/	__le16	s_def_resuid;		/* Default uid for reserved blocks */
1312 	__le16	s_def_resgid;		/* Default gid for reserved blocks */
1313 	/*
1314 	 * These fields are for EXT4_DYNAMIC_REV superblocks only.
1315 	 *
1316 	 * Note: the difference between the compatible feature set and
1317 	 * the incompatible feature set is that if there is a bit set
1318 	 * in the incompatible feature set that the kernel doesn't
1319 	 * know about, it should refuse to mount the filesystem.
1320 	 *
1321 	 * e2fsck's requirements are more strict; if it doesn't know
1322 	 * about a feature in either the compatible or incompatible
1323 	 * feature set, it must abort and not try to meddle with
1324 	 * things it doesn't understand...
1325 	 */
1326 	__le32	s_first_ino;		/* First non-reserved inode */
1327 	__le16  s_inode_size;		/* size of inode structure */
1328 	__le16	s_block_group_nr;	/* block group # of this superblock */
1329 	__le32	s_feature_compat;	/* compatible feature set */
1330 /*60*/	__le32	s_feature_incompat;	/* incompatible feature set */
1331 	__le32	s_feature_ro_compat;	/* readonly-compatible feature set */
1332 /*68*/	__u8	s_uuid[16];		/* 128-bit uuid for volume */
1333 /*78*/	char	s_volume_name[EXT4_LABEL_MAX];	/* volume name */
1334 /*88*/	char	s_last_mounted[64] __nonstring;	/* directory where last mounted */
1335 /*C8*/	__le32	s_algorithm_usage_bitmap; /* For compression */
1336 	/*
1337 	 * Performance hints.  Directory preallocation should only
1338 	 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
1339 	 */
1340 	__u8	s_prealloc_blocks;	/* Nr of blocks to try to preallocate*/
1341 	__u8	s_prealloc_dir_blocks;	/* Nr to preallocate for dirs */
1342 	__le16	s_reserved_gdt_blocks;	/* Per group desc for online growth */
1343 	/*
1344 	 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
1345 	 */
1346 /*D0*/	__u8	s_journal_uuid[16];	/* uuid of journal superblock */
1347 /*E0*/	__le32	s_journal_inum;		/* inode number of journal file */
1348 	__le32	s_journal_dev;		/* device number of journal file */
1349 	__le32	s_last_orphan;		/* start of list of inodes to delete */
1350 	__le32	s_hash_seed[4];		/* HTREE hash seed */
1351 	__u8	s_def_hash_version;	/* Default hash version to use */
1352 	__u8	s_jnl_backup_type;
1353 	__le16  s_desc_size;		/* size of group descriptor */
1354 /*100*/	__le32	s_default_mount_opts;
1355 	__le32	s_first_meta_bg;	/* First metablock block group */
1356 	__le32	s_mkfs_time;		/* When the filesystem was created */
1357 	__le32	s_jnl_blocks[17];	/* Backup of the journal inode */
1358 	/* 64bit support valid if EXT4_FEATURE_INCOMPAT_64BIT */
1359 /*150*/	__le32	s_blocks_count_hi;	/* Blocks count */
1360 	__le32	s_r_blocks_count_hi;	/* Reserved blocks count */
1361 	__le32	s_free_blocks_count_hi;	/* Free blocks count */
1362 	__le16	s_min_extra_isize;	/* All inodes have at least # bytes */
1363 	__le16	s_want_extra_isize; 	/* New inodes should reserve # bytes */
1364 	__le32	s_flags;		/* Miscellaneous flags */
1365 	__le16  s_raid_stride;		/* RAID stride */
1366 	__le16  s_mmp_update_interval;  /* # seconds to wait in MMP checking */
1367 	__le64  s_mmp_block;            /* Block for multi-mount protection */
1368 	__le32  s_raid_stripe_width;    /* blocks on all data disks (N*stride)*/
1369 	__u8	s_log_groups_per_flex;  /* FLEX_BG group size */
1370 	__u8	s_checksum_type;	/* metadata checksum algorithm used */
1371 	__u8	s_encryption_level;	/* versioning level for encryption */
1372 	__u8	s_reserved_pad;		/* Padding to next 32bits */
1373 	__le64	s_kbytes_written;	/* nr of lifetime kilobytes written */
1374 	__le32	s_snapshot_inum;	/* Inode number of active snapshot */
1375 	__le32	s_snapshot_id;		/* sequential ID of active snapshot */
1376 	__le64	s_snapshot_r_blocks_count; /* reserved blocks for active
1377 					      snapshot's future use */
1378 	__le32	s_snapshot_list;	/* inode number of the head of the
1379 					   on-disk snapshot list */
1380 #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count)
1381 	__le32	s_error_count;		/* number of fs errors */
1382 	__le32	s_first_error_time;	/* first time an error happened */
1383 	__le32	s_first_error_ino;	/* inode involved in first error */
1384 	__le64	s_first_error_block;	/* block involved of first error */
1385 	__u8	s_first_error_func[32] __nonstring;	/* function where the error happened */
1386 	__le32	s_first_error_line;	/* line number where error happened */
1387 	__le32	s_last_error_time;	/* most recent time of an error */
1388 	__le32	s_last_error_ino;	/* inode involved in last error */
1389 	__le32	s_last_error_line;	/* line number where error happened */
1390 	__le64	s_last_error_block;	/* block involved of last error */
1391 	__u8	s_last_error_func[32] __nonstring;	/* function where the error happened */
1392 #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts)
1393 	__u8	s_mount_opts[64];
1394 	__le32	s_usr_quota_inum;	/* inode for tracking user quota */
1395 	__le32	s_grp_quota_inum;	/* inode for tracking group quota */
1396 	__le32	s_overhead_clusters;	/* overhead blocks/clusters in fs */
1397 	__le32	s_backup_bgs[2];	/* groups with sparse_super2 SBs */
1398 	__u8	s_encrypt_algos[4];	/* Encryption algorithms in use  */
1399 	__u8	s_encrypt_pw_salt[16];	/* Salt used for string2key algorithm */
1400 	__le32	s_lpf_ino;		/* Location of the lost+found inode */
1401 	__le32	s_prj_quota_inum;	/* inode for tracking project quota */
1402 	__le32	s_checksum_seed;	/* crc32c(uuid) if csum_seed set */
1403 	__u8	s_wtime_hi;
1404 	__u8	s_mtime_hi;
1405 	__u8	s_mkfs_time_hi;
1406 	__u8	s_lastcheck_hi;
1407 	__u8	s_first_error_time_hi;
1408 	__u8	s_last_error_time_hi;
1409 	__u8	s_first_error_errcode;
1410 	__u8    s_last_error_errcode;
1411 	__le16  s_encoding;		/* Filename charset encoding */
1412 	__le16  s_encoding_flags;	/* Filename charset encoding flags */
1413 	__le32  s_orphan_file_inum;	/* Inode for tracking orphan inodes */
1414 	__le32	s_reserved[94];		/* Padding to the end of the block */
1415 	__le32	s_checksum;		/* crc32c(superblock) */
1416 };
1417 
1418 #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START)
1419 
1420 #ifdef __KERNEL__
1421 
1422 /* Number of quota types we support */
1423 #define EXT4_MAXQUOTAS 3
1424 
1425 #define EXT4_ENC_UTF8_12_1	1
1426 
1427 /* Types of ext4 journal triggers */
1428 enum ext4_journal_trigger_type {
1429 	EXT4_JTR_ORPHAN_FILE,
1430 	EXT4_JTR_NONE	/* This must be the last entry for indexing to work! */
1431 };
1432 
1433 #define EXT4_JOURNAL_TRIGGER_COUNT EXT4_JTR_NONE
1434 
1435 struct ext4_journal_trigger {
1436 	struct jbd2_buffer_trigger_type tr_triggers;
1437 	struct super_block *sb;
1438 };
1439 
1440 static inline struct ext4_journal_trigger *EXT4_TRIGGER(
1441 				struct jbd2_buffer_trigger_type *trigger)
1442 {
1443 	return container_of(trigger, struct ext4_journal_trigger, tr_triggers);
1444 }
1445 
1446 #define EXT4_ORPHAN_BLOCK_MAGIC 0x0b10ca04
1447 
1448 /* Structure at the tail of orphan block */
1449 struct ext4_orphan_block_tail {
1450 	__le32 ob_magic;
1451 	__le32 ob_checksum;
1452 };
1453 
1454 static inline int ext4_inodes_per_orphan_block(struct super_block *sb)
1455 {
1456 	return (sb->s_blocksize - sizeof(struct ext4_orphan_block_tail)) /
1457 			sizeof(u32);
1458 }
1459 
1460 struct ext4_orphan_block {
1461 	atomic_t ob_free_entries;	/* Number of free orphan entries in block */
1462 	struct buffer_head *ob_bh;	/* Buffer for orphan block */
1463 };
1464 
1465 /*
1466  * Info about orphan file.
1467  */
1468 struct ext4_orphan_info {
1469 	int of_blocks;			/* Number of orphan blocks in a file */
1470 	__u32 of_csum_seed;		/* Checksum seed for orphan file */
1471 	struct ext4_orphan_block *of_binfo;	/* Array with info about orphan
1472 						 * file blocks */
1473 };
1474 
1475 /*
1476  * fourth extended-fs super-block data in memory
1477  */
1478 struct ext4_sb_info {
1479 	unsigned long s_desc_size;	/* Size of a group descriptor in bytes */
1480 	unsigned long s_inodes_per_block;/* Number of inodes per block */
1481 	unsigned long s_blocks_per_group;/* Number of blocks in a group */
1482 	unsigned long s_clusters_per_group; /* Number of clusters in a group */
1483 	unsigned long s_inodes_per_group;/* Number of inodes in a group */
1484 	unsigned long s_itb_per_group;	/* Number of inode table blocks per group */
1485 	unsigned long s_gdb_count;	/* Number of group descriptor blocks */
1486 	unsigned long s_desc_per_block;	/* Number of group descriptors per block */
1487 	ext4_group_t s_groups_count;	/* Number of groups in the fs */
1488 	ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */
1489 	unsigned long s_overhead;  /* # of fs overhead clusters */
1490 	unsigned int s_cluster_ratio;	/* Number of blocks per cluster */
1491 	unsigned int s_cluster_bits;	/* log2 of s_cluster_ratio */
1492 	loff_t s_bitmap_maxbytes;	/* max bytes for bitmap files */
1493 	struct buffer_head * s_sbh;	/* Buffer containing the super block */
1494 	struct ext4_super_block *s_es;	/* Pointer to the super block in the buffer */
1495 	struct buffer_head * __rcu *s_group_desc;
1496 	unsigned int s_mount_opt;
1497 	unsigned int s_mount_opt2;
1498 	unsigned long s_mount_flags;
1499 	unsigned int s_def_mount_opt;
1500 	unsigned int s_def_mount_opt2;
1501 	ext4_fsblk_t s_sb_block;
1502 	atomic64_t s_resv_clusters;
1503 	kuid_t s_resuid;
1504 	kgid_t s_resgid;
1505 	unsigned short s_mount_state;
1506 	unsigned short s_pad;
1507 	int s_addr_per_block_bits;
1508 	int s_desc_per_block_bits;
1509 	int s_inode_size;
1510 	int s_first_ino;
1511 	unsigned int s_inode_readahead_blks;
1512 	unsigned int s_inode_goal;
1513 	u32 s_hash_seed[4];
1514 	int s_def_hash_version;
1515 	int s_hash_unsigned;	/* 3 if hash should be unsigned, 0 if not */
1516 	struct percpu_counter s_freeclusters_counter;
1517 	struct percpu_counter s_freeinodes_counter;
1518 	struct percpu_counter s_dirs_counter;
1519 	struct percpu_counter s_dirtyclusters_counter;
1520 	struct percpu_counter s_sra_exceeded_retry_limit;
1521 	struct blockgroup_lock *s_blockgroup_lock;
1522 	struct proc_dir_entry *s_proc;
1523 	struct kobject s_kobj;
1524 	struct completion s_kobj_unregister;
1525 	struct super_block *s_sb;
1526 	struct buffer_head *s_mmp_bh;
1527 
1528 	/* Journaling */
1529 	struct journal_s *s_journal;
1530 	unsigned long s_ext4_flags;		/* Ext4 superblock flags */
1531 	struct mutex s_orphan_lock;	/* Protects on disk list changes */
1532 	struct list_head s_orphan;	/* List of orphaned inodes in on disk
1533 					   list */
1534 	struct ext4_orphan_info s_orphan_info;
1535 	unsigned long s_commit_interval;
1536 	u32 s_max_batch_time;
1537 	u32 s_min_batch_time;
1538 	struct block_device *s_journal_bdev;
1539 #ifdef CONFIG_QUOTA
1540 	/* Names of quota files with journalled quota */
1541 	char __rcu *s_qf_names[EXT4_MAXQUOTAS];
1542 	int s_jquota_fmt;			/* Format of quota to use */
1543 #endif
1544 	unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */
1545 	struct ext4_system_blocks __rcu *s_system_blks;
1546 
1547 #ifdef EXTENTS_STATS
1548 	/* ext4 extents stats */
1549 	unsigned long s_ext_min;
1550 	unsigned long s_ext_max;
1551 	unsigned long s_depth_max;
1552 	spinlock_t s_ext_stats_lock;
1553 	unsigned long s_ext_blocks;
1554 	unsigned long s_ext_extents;
1555 #endif
1556 
1557 	/* for buddy allocator */
1558 	struct ext4_group_info ** __rcu *s_group_info;
1559 	struct inode *s_buddy_cache;
1560 	spinlock_t s_md_lock;
1561 	unsigned short *s_mb_offsets;
1562 	unsigned int *s_mb_maxs;
1563 	unsigned int s_group_info_size;
1564 	unsigned int s_mb_free_pending;
1565 	struct list_head s_freed_data_list;	/* List of blocks to be freed
1566 						   after commit completed */
1567 	struct list_head s_discard_list;
1568 	struct work_struct s_discard_work;
1569 	atomic_t s_retry_alloc_pending;
1570 	struct list_head *s_mb_avg_fragment_size;
1571 	rwlock_t *s_mb_avg_fragment_size_locks;
1572 	struct list_head *s_mb_largest_free_orders;
1573 	rwlock_t *s_mb_largest_free_orders_locks;
1574 
1575 	/* tunables */
1576 	unsigned long s_stripe;
1577 	unsigned int s_mb_max_linear_groups;
1578 	unsigned int s_mb_stream_request;
1579 	unsigned int s_mb_max_to_scan;
1580 	unsigned int s_mb_min_to_scan;
1581 	unsigned int s_mb_stats;
1582 	unsigned int s_mb_order2_reqs;
1583 	unsigned int s_mb_group_prealloc;
1584 	unsigned int s_max_dir_size_kb;
1585 	/* where last allocation was done - for stream allocation */
1586 	unsigned long s_mb_last_group;
1587 	unsigned long s_mb_last_start;
1588 	unsigned int s_mb_prefetch;
1589 	unsigned int s_mb_prefetch_limit;
1590 	unsigned int s_mb_best_avail_max_trim_order;
1591 
1592 	/* stats for buddy allocator */
1593 	atomic_t s_bal_reqs;	/* number of reqs with len > 1 */
1594 	atomic_t s_bal_success;	/* we found long enough chunks */
1595 	atomic_t s_bal_allocated;	/* in blocks */
1596 	atomic_t s_bal_ex_scanned;	/* total extents scanned */
1597 	atomic_t s_bal_cX_ex_scanned[EXT4_MB_NUM_CRS];	/* total extents scanned */
1598 	atomic_t s_bal_groups_scanned;	/* number of groups scanned */
1599 	atomic_t s_bal_goals;	/* goal hits */
1600 	atomic_t s_bal_len_goals;	/* len goal hits */
1601 	atomic_t s_bal_breaks;	/* too long searches */
1602 	atomic_t s_bal_2orders;	/* 2^order hits */
1603 	atomic_t s_bal_p2_aligned_bad_suggestions;
1604 	atomic_t s_bal_goal_fast_bad_suggestions;
1605 	atomic_t s_bal_best_avail_bad_suggestions;
1606 	atomic64_t s_bal_cX_groups_considered[EXT4_MB_NUM_CRS];
1607 	atomic64_t s_bal_cX_hits[EXT4_MB_NUM_CRS];
1608 	atomic64_t s_bal_cX_failed[EXT4_MB_NUM_CRS];		/* cX loop didn't find blocks */
1609 	atomic_t s_mb_buddies_generated;	/* number of buddies generated */
1610 	atomic64_t s_mb_generation_time;
1611 	atomic_t s_mb_lost_chunks;
1612 	atomic_t s_mb_preallocated;
1613 	atomic_t s_mb_discarded;
1614 	atomic_t s_lock_busy;
1615 
1616 	/* locality groups */
1617 	struct ext4_locality_group __percpu *s_locality_groups;
1618 
1619 	/* for write statistics */
1620 	unsigned long s_sectors_written_start;
1621 	u64 s_kbytes_written;
1622 
1623 	/* the size of zero-out chunk */
1624 	unsigned int s_extent_max_zeroout_kb;
1625 
1626 	unsigned int s_log_groups_per_flex;
1627 	struct flex_groups * __rcu *s_flex_groups;
1628 	ext4_group_t s_flex_groups_allocated;
1629 
1630 	/* workqueue for reserved extent conversions (buffered io) */
1631 	struct workqueue_struct *rsv_conversion_wq;
1632 
1633 	/* timer for periodic error stats printing */
1634 	struct timer_list s_err_report;
1635 
1636 	/* Lazy inode table initialization info */
1637 	struct ext4_li_request *s_li_request;
1638 	/* Wait multiplier for lazy initialization thread */
1639 	unsigned int s_li_wait_mult;
1640 
1641 	/* Kernel thread for multiple mount protection */
1642 	struct task_struct *s_mmp_tsk;
1643 
1644 	/* record the last minlen when FITRIM is called. */
1645 	unsigned long s_last_trim_minblks;
1646 
1647 	/* Reference to checksum algorithm driver via cryptoapi */
1648 	struct crypto_shash *s_chksum_driver;
1649 
1650 	/* Precomputed FS UUID checksum for seeding other checksums */
1651 	__u32 s_csum_seed;
1652 
1653 	/* Reclaim extents from extent status tree */
1654 	struct shrinker s_es_shrinker;
1655 	struct list_head s_es_list;	/* List of inodes with reclaimable extents */
1656 	long s_es_nr_inode;
1657 	struct ext4_es_stats s_es_stats;
1658 	struct mb_cache *s_ea_block_cache;
1659 	struct mb_cache *s_ea_inode_cache;
1660 	spinlock_t s_es_lock ____cacheline_aligned_in_smp;
1661 
1662 	/* Journal triggers for checksum computation */
1663 	struct ext4_journal_trigger s_journal_triggers[EXT4_JOURNAL_TRIGGER_COUNT];
1664 
1665 	/* Ratelimit ext4 messages. */
1666 	struct ratelimit_state s_err_ratelimit_state;
1667 	struct ratelimit_state s_warning_ratelimit_state;
1668 	struct ratelimit_state s_msg_ratelimit_state;
1669 	atomic_t s_warning_count;
1670 	atomic_t s_msg_count;
1671 
1672 	/* Encryption policy for '-o test_dummy_encryption' */
1673 	struct fscrypt_dummy_policy s_dummy_enc_policy;
1674 
1675 	/*
1676 	 * Barrier between writepages ops and changing any inode's JOURNAL_DATA
1677 	 * or EXTENTS flag.
1678 	 */
1679 	struct percpu_rw_semaphore s_writepages_rwsem;
1680 	struct dax_device *s_daxdev;
1681 	u64 s_dax_part_off;
1682 #ifdef CONFIG_EXT4_DEBUG
1683 	unsigned long s_simulate_fail;
1684 #endif
1685 	/* Record the errseq of the backing block device */
1686 	errseq_t s_bdev_wb_err;
1687 	spinlock_t s_bdev_wb_lock;
1688 
1689 	/* Information about errors that happened during this mount */
1690 	spinlock_t s_error_lock;
1691 	int s_add_error_count;
1692 	int s_first_error_code;
1693 	__u32 s_first_error_line;
1694 	__u32 s_first_error_ino;
1695 	__u64 s_first_error_block;
1696 	const char *s_first_error_func;
1697 	time64_t s_first_error_time;
1698 	int s_last_error_code;
1699 	__u32 s_last_error_line;
1700 	__u32 s_last_error_ino;
1701 	__u64 s_last_error_block;
1702 	const char *s_last_error_func;
1703 	time64_t s_last_error_time;
1704 	/*
1705 	 * If we are in a context where we cannot update error information in
1706 	 * the on-disk superblock, we queue this work to do it.
1707 	 */
1708 	struct work_struct s_error_work;
1709 
1710 	/* Ext4 fast commit sub transaction ID */
1711 	atomic_t s_fc_subtid;
1712 
1713 	/*
1714 	 * After commit starts, the main queue gets locked, and the further
1715 	 * updates get added in the staging queue.
1716 	 */
1717 #define FC_Q_MAIN	0
1718 #define FC_Q_STAGING	1
1719 	struct list_head s_fc_q[2];	/* Inodes staged for fast commit
1720 					 * that have data changes in them.
1721 					 */
1722 	struct list_head s_fc_dentry_q[2];	/* directory entry updates */
1723 	unsigned int s_fc_bytes;
1724 	/*
1725 	 * Main fast commit lock. This lock protects accesses to the
1726 	 * following fields:
1727 	 * ei->i_fc_list, s_fc_dentry_q, s_fc_q, s_fc_bytes, s_fc_bh.
1728 	 */
1729 	spinlock_t s_fc_lock;
1730 	struct buffer_head *s_fc_bh;
1731 	struct ext4_fc_stats s_fc_stats;
1732 	tid_t s_fc_ineligible_tid;
1733 #ifdef CONFIG_EXT4_DEBUG
1734 	int s_fc_debug_max_replay;
1735 #endif
1736 	struct ext4_fc_replay_state s_fc_replay_state;
1737 };
1738 
1739 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb)
1740 {
1741 	return sb->s_fs_info;
1742 }
1743 static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
1744 {
1745 	return container_of(inode, struct ext4_inode_info, vfs_inode);
1746 }
1747 
1748 static inline int ext4_writepages_down_read(struct super_block *sb)
1749 {
1750 	percpu_down_read(&EXT4_SB(sb)->s_writepages_rwsem);
1751 	return memalloc_nofs_save();
1752 }
1753 
1754 static inline void ext4_writepages_up_read(struct super_block *sb, int ctx)
1755 {
1756 	memalloc_nofs_restore(ctx);
1757 	percpu_up_read(&EXT4_SB(sb)->s_writepages_rwsem);
1758 }
1759 
1760 static inline int ext4_writepages_down_write(struct super_block *sb)
1761 {
1762 	percpu_down_write(&EXT4_SB(sb)->s_writepages_rwsem);
1763 	return memalloc_nofs_save();
1764 }
1765 
1766 static inline void ext4_writepages_up_write(struct super_block *sb, int ctx)
1767 {
1768 	memalloc_nofs_restore(ctx);
1769 	percpu_up_write(&EXT4_SB(sb)->s_writepages_rwsem);
1770 }
1771 
1772 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
1773 {
1774 	return ino == EXT4_ROOT_INO ||
1775 		(ino >= EXT4_FIRST_INO(sb) &&
1776 		 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
1777 }
1778 
1779 /*
1780  * Returns: sbi->field[index]
1781  * Used to access an array element from the following sbi fields which require
1782  * rcu protection to avoid dereferencing an invalid pointer due to reassignment
1783  * - s_group_desc
1784  * - s_group_info
1785  * - s_flex_group
1786  */
1787 #define sbi_array_rcu_deref(sbi, field, index)				   \
1788 ({									   \
1789 	typeof(*((sbi)->field)) _v;					   \
1790 	rcu_read_lock();						   \
1791 	_v = ((typeof(_v)*)rcu_dereference((sbi)->field))[index];	   \
1792 	rcu_read_unlock();						   \
1793 	_v;								   \
1794 })
1795 
1796 /*
1797  * run-time mount flags
1798  */
1799 enum {
1800 	EXT4_MF_MNTDIR_SAMPLED,
1801 	EXT4_MF_FS_ABORTED,	/* Fatal error detected */
1802 	EXT4_MF_FC_INELIGIBLE	/* Fast commit ineligible */
1803 };
1804 
1805 static inline void ext4_set_mount_flag(struct super_block *sb, int bit)
1806 {
1807 	set_bit(bit, &EXT4_SB(sb)->s_mount_flags);
1808 }
1809 
1810 static inline void ext4_clear_mount_flag(struct super_block *sb, int bit)
1811 {
1812 	clear_bit(bit, &EXT4_SB(sb)->s_mount_flags);
1813 }
1814 
1815 static inline int ext4_test_mount_flag(struct super_block *sb, int bit)
1816 {
1817 	return test_bit(bit, &EXT4_SB(sb)->s_mount_flags);
1818 }
1819 
1820 
1821 /*
1822  * Simulate_fail codes
1823  */
1824 #define EXT4_SIM_BBITMAP_EIO	1
1825 #define EXT4_SIM_BBITMAP_CRC	2
1826 #define EXT4_SIM_IBITMAP_EIO	3
1827 #define EXT4_SIM_IBITMAP_CRC	4
1828 #define EXT4_SIM_INODE_EIO	5
1829 #define EXT4_SIM_INODE_CRC	6
1830 #define EXT4_SIM_DIRBLOCK_EIO	7
1831 #define EXT4_SIM_DIRBLOCK_CRC	8
1832 
1833 static inline bool ext4_simulate_fail(struct super_block *sb,
1834 				     unsigned long code)
1835 {
1836 #ifdef CONFIG_EXT4_DEBUG
1837 	struct ext4_sb_info *sbi = EXT4_SB(sb);
1838 
1839 	if (unlikely(sbi->s_simulate_fail == code)) {
1840 		sbi->s_simulate_fail = 0;
1841 		return true;
1842 	}
1843 #endif
1844 	return false;
1845 }
1846 
1847 static inline void ext4_simulate_fail_bh(struct super_block *sb,
1848 					 struct buffer_head *bh,
1849 					 unsigned long code)
1850 {
1851 	if (!IS_ERR(bh) && ext4_simulate_fail(sb, code))
1852 		clear_buffer_uptodate(bh);
1853 }
1854 
1855 /*
1856  * Error number codes for s_{first,last}_error_errno
1857  *
1858  * Linux errno numbers are architecture specific, so we need to translate
1859  * them into something which is architecture independent.   We don't define
1860  * codes for all errno's; just the ones which are most likely to be the cause
1861  * of an ext4_error() call.
1862  */
1863 #define EXT4_ERR_UNKNOWN	 1
1864 #define EXT4_ERR_EIO		 2
1865 #define EXT4_ERR_ENOMEM		 3
1866 #define EXT4_ERR_EFSBADCRC	 4
1867 #define EXT4_ERR_EFSCORRUPTED	 5
1868 #define EXT4_ERR_ENOSPC		 6
1869 #define EXT4_ERR_ENOKEY		 7
1870 #define EXT4_ERR_EROFS		 8
1871 #define EXT4_ERR_EFBIG		 9
1872 #define EXT4_ERR_EEXIST		10
1873 #define EXT4_ERR_ERANGE		11
1874 #define EXT4_ERR_EOVERFLOW	12
1875 #define EXT4_ERR_EBUSY		13
1876 #define EXT4_ERR_ENOTDIR	14
1877 #define EXT4_ERR_ENOTEMPTY	15
1878 #define EXT4_ERR_ESHUTDOWN	16
1879 #define EXT4_ERR_EFAULT		17
1880 
1881 /*
1882  * Inode dynamic state flags
1883  */
1884 enum {
1885 	EXT4_STATE_NEW,			/* inode is newly created */
1886 	EXT4_STATE_XATTR,		/* has in-inode xattrs */
1887 	EXT4_STATE_NO_EXPAND,		/* No space for expansion */
1888 	EXT4_STATE_DA_ALLOC_CLOSE,	/* Alloc DA blks on close */
1889 	EXT4_STATE_EXT_MIGRATE,		/* Inode is migrating */
1890 	EXT4_STATE_NEWENTRY,		/* File just added to dir */
1891 	EXT4_STATE_MAY_INLINE_DATA,	/* may have in-inode data */
1892 	EXT4_STATE_EXT_PRECACHED,	/* extents have been precached */
1893 	EXT4_STATE_LUSTRE_EA_INODE,	/* Lustre-style ea_inode */
1894 	EXT4_STATE_VERITY_IN_PROGRESS,	/* building fs-verity Merkle tree */
1895 	EXT4_STATE_FC_COMMITTING,	/* Fast commit ongoing */
1896 	EXT4_STATE_ORPHAN_FILE,		/* Inode orphaned in orphan file */
1897 };
1898 
1899 #define EXT4_INODE_BIT_FNS(name, field, offset)				\
1900 static inline int ext4_test_inode_##name(struct inode *inode, int bit)	\
1901 {									\
1902 	return test_bit(bit + (offset), &EXT4_I(inode)->i_##field);	\
1903 }									\
1904 static inline void ext4_set_inode_##name(struct inode *inode, int bit)	\
1905 {									\
1906 	set_bit(bit + (offset), &EXT4_I(inode)->i_##field);		\
1907 }									\
1908 static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \
1909 {									\
1910 	clear_bit(bit + (offset), &EXT4_I(inode)->i_##field);		\
1911 }
1912 
1913 /* Add these declarations here only so that these functions can be
1914  * found by name.  Otherwise, they are very hard to locate. */
1915 static inline int ext4_test_inode_flag(struct inode *inode, int bit);
1916 static inline void ext4_set_inode_flag(struct inode *inode, int bit);
1917 static inline void ext4_clear_inode_flag(struct inode *inode, int bit);
1918 EXT4_INODE_BIT_FNS(flag, flags, 0)
1919 
1920 /* Add these declarations here only so that these functions can be
1921  * found by name.  Otherwise, they are very hard to locate. */
1922 static inline int ext4_test_inode_state(struct inode *inode, int bit);
1923 static inline void ext4_set_inode_state(struct inode *inode, int bit);
1924 static inline void ext4_clear_inode_state(struct inode *inode, int bit);
1925 #if (BITS_PER_LONG < 64)
1926 EXT4_INODE_BIT_FNS(state, state_flags, 0)
1927 
1928 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1929 {
1930 	(ei)->i_state_flags = 0;
1931 }
1932 #else
1933 EXT4_INODE_BIT_FNS(state, flags, 32)
1934 
1935 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1936 {
1937 	/* We depend on the fact that callers will set i_flags */
1938 }
1939 #endif
1940 #else
1941 /* Assume that user mode programs are passing in an ext4fs superblock, not
1942  * a kernel struct super_block.  This will allow us to call the feature-test
1943  * macros from user land. */
1944 #define EXT4_SB(sb)	(sb)
1945 #endif
1946 
1947 static inline bool ext4_verity_in_progress(struct inode *inode)
1948 {
1949 	return IS_ENABLED(CONFIG_FS_VERITY) &&
1950 	       ext4_test_inode_state(inode, EXT4_STATE_VERITY_IN_PROGRESS);
1951 }
1952 
1953 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
1954 
1955 /*
1956  * Codes for operating systems
1957  */
1958 #define EXT4_OS_LINUX		0
1959 #define EXT4_OS_HURD		1
1960 #define EXT4_OS_MASIX		2
1961 #define EXT4_OS_FREEBSD		3
1962 #define EXT4_OS_LITES		4
1963 
1964 /*
1965  * Revision levels
1966  */
1967 #define EXT4_GOOD_OLD_REV	0	/* The good old (original) format */
1968 #define EXT4_DYNAMIC_REV	1	/* V2 format w/ dynamic inode sizes */
1969 
1970 #define EXT4_MAX_SUPP_REV	EXT4_DYNAMIC_REV
1971 
1972 #define EXT4_GOOD_OLD_INODE_SIZE 128
1973 
1974 #define EXT4_EXTRA_TIMESTAMP_MAX	(((s64)1 << 34) - 1  + S32_MIN)
1975 #define EXT4_NON_EXTRA_TIMESTAMP_MAX	S32_MAX
1976 #define EXT4_TIMESTAMP_MIN		S32_MIN
1977 
1978 /*
1979  * Feature set definitions
1980  */
1981 
1982 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC	0x0001
1983 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES	0x0002
1984 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL		0x0004
1985 #define EXT4_FEATURE_COMPAT_EXT_ATTR		0x0008
1986 #define EXT4_FEATURE_COMPAT_RESIZE_INODE	0x0010
1987 #define EXT4_FEATURE_COMPAT_DIR_INDEX		0x0020
1988 #define EXT4_FEATURE_COMPAT_SPARSE_SUPER2	0x0200
1989 /*
1990  * The reason why "FAST_COMMIT" is a compat feature is that, FS becomes
1991  * incompatible only if fast commit blocks are present in the FS. Since we
1992  * clear the journal (and thus the fast commit blocks), we don't mark FS as
1993  * incompatible. We also have a JBD2 incompat feature, which gets set when
1994  * there are fast commit blocks present in the journal.
1995  */
1996 #define EXT4_FEATURE_COMPAT_FAST_COMMIT		0x0400
1997 #define EXT4_FEATURE_COMPAT_STABLE_INODES	0x0800
1998 #define EXT4_FEATURE_COMPAT_ORPHAN_FILE		0x1000	/* Orphan file exists */
1999 
2000 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER	0x0001
2001 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE	0x0002
2002 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR	0x0004
2003 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE        0x0008
2004 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM		0x0010
2005 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK	0x0020
2006 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE	0x0040
2007 #define EXT4_FEATURE_RO_COMPAT_QUOTA		0x0100
2008 #define EXT4_FEATURE_RO_COMPAT_BIGALLOC		0x0200
2009 /*
2010  * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM).  When
2011  * METADATA_CSUM is set, group descriptor checksums use the same algorithm as
2012  * all other data structures' checksums.  However, the METADATA_CSUM and
2013  * GDT_CSUM bits are mutually exclusive.
2014  */
2015 #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM	0x0400
2016 #define EXT4_FEATURE_RO_COMPAT_READONLY		0x1000
2017 #define EXT4_FEATURE_RO_COMPAT_PROJECT		0x2000
2018 #define EXT4_FEATURE_RO_COMPAT_VERITY		0x8000
2019 #define EXT4_FEATURE_RO_COMPAT_ORPHAN_PRESENT	0x10000 /* Orphan file may be
2020 							   non-empty */
2021 
2022 #define EXT4_FEATURE_INCOMPAT_COMPRESSION	0x0001
2023 #define EXT4_FEATURE_INCOMPAT_FILETYPE		0x0002
2024 #define EXT4_FEATURE_INCOMPAT_RECOVER		0x0004 /* Needs recovery */
2025 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV	0x0008 /* Journal device */
2026 #define EXT4_FEATURE_INCOMPAT_META_BG		0x0010
2027 #define EXT4_FEATURE_INCOMPAT_EXTENTS		0x0040 /* extents support */
2028 #define EXT4_FEATURE_INCOMPAT_64BIT		0x0080
2029 #define EXT4_FEATURE_INCOMPAT_MMP               0x0100
2030 #define EXT4_FEATURE_INCOMPAT_FLEX_BG		0x0200
2031 #define EXT4_FEATURE_INCOMPAT_EA_INODE		0x0400 /* EA in inode */
2032 #define EXT4_FEATURE_INCOMPAT_DIRDATA		0x1000 /* data in dirent */
2033 #define EXT4_FEATURE_INCOMPAT_CSUM_SEED		0x2000
2034 #define EXT4_FEATURE_INCOMPAT_LARGEDIR		0x4000 /* >2GB or 3-lvl htree */
2035 #define EXT4_FEATURE_INCOMPAT_INLINE_DATA	0x8000 /* data in inode */
2036 #define EXT4_FEATURE_INCOMPAT_ENCRYPT		0x10000
2037 #define EXT4_FEATURE_INCOMPAT_CASEFOLD		0x20000
2038 
2039 extern void ext4_update_dynamic_rev(struct super_block *sb);
2040 
2041 #define EXT4_FEATURE_COMPAT_FUNCS(name, flagname) \
2042 static inline bool ext4_has_feature_##name(struct super_block *sb) \
2043 { \
2044 	return ((EXT4_SB(sb)->s_es->s_feature_compat & \
2045 		cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname)) != 0); \
2046 } \
2047 static inline void ext4_set_feature_##name(struct super_block *sb) \
2048 { \
2049 	ext4_update_dynamic_rev(sb); \
2050 	EXT4_SB(sb)->s_es->s_feature_compat |= \
2051 		cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \
2052 } \
2053 static inline void ext4_clear_feature_##name(struct super_block *sb) \
2054 { \
2055 	EXT4_SB(sb)->s_es->s_feature_compat &= \
2056 		~cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \
2057 }
2058 
2059 #define EXT4_FEATURE_RO_COMPAT_FUNCS(name, flagname) \
2060 static inline bool ext4_has_feature_##name(struct super_block *sb) \
2061 { \
2062 	return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \
2063 		cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname)) != 0); \
2064 } \
2065 static inline void ext4_set_feature_##name(struct super_block *sb) \
2066 { \
2067 	ext4_update_dynamic_rev(sb); \
2068 	EXT4_SB(sb)->s_es->s_feature_ro_compat |= \
2069 		cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \
2070 } \
2071 static inline void ext4_clear_feature_##name(struct super_block *sb) \
2072 { \
2073 	EXT4_SB(sb)->s_es->s_feature_ro_compat &= \
2074 		~cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \
2075 }
2076 
2077 #define EXT4_FEATURE_INCOMPAT_FUNCS(name, flagname) \
2078 static inline bool ext4_has_feature_##name(struct super_block *sb) \
2079 { \
2080 	return ((EXT4_SB(sb)->s_es->s_feature_incompat & \
2081 		cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname)) != 0); \
2082 } \
2083 static inline void ext4_set_feature_##name(struct super_block *sb) \
2084 { \
2085 	ext4_update_dynamic_rev(sb); \
2086 	EXT4_SB(sb)->s_es->s_feature_incompat |= \
2087 		cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \
2088 } \
2089 static inline void ext4_clear_feature_##name(struct super_block *sb) \
2090 { \
2091 	EXT4_SB(sb)->s_es->s_feature_incompat &= \
2092 		~cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \
2093 }
2094 
2095 EXT4_FEATURE_COMPAT_FUNCS(dir_prealloc,		DIR_PREALLOC)
2096 EXT4_FEATURE_COMPAT_FUNCS(imagic_inodes,	IMAGIC_INODES)
2097 EXT4_FEATURE_COMPAT_FUNCS(journal,		HAS_JOURNAL)
2098 EXT4_FEATURE_COMPAT_FUNCS(xattr,		EXT_ATTR)
2099 EXT4_FEATURE_COMPAT_FUNCS(resize_inode,		RESIZE_INODE)
2100 EXT4_FEATURE_COMPAT_FUNCS(dir_index,		DIR_INDEX)
2101 EXT4_FEATURE_COMPAT_FUNCS(sparse_super2,	SPARSE_SUPER2)
2102 EXT4_FEATURE_COMPAT_FUNCS(fast_commit,		FAST_COMMIT)
2103 EXT4_FEATURE_COMPAT_FUNCS(stable_inodes,	STABLE_INODES)
2104 EXT4_FEATURE_COMPAT_FUNCS(orphan_file,		ORPHAN_FILE)
2105 
2106 EXT4_FEATURE_RO_COMPAT_FUNCS(sparse_super,	SPARSE_SUPER)
2107 EXT4_FEATURE_RO_COMPAT_FUNCS(large_file,	LARGE_FILE)
2108 EXT4_FEATURE_RO_COMPAT_FUNCS(btree_dir,		BTREE_DIR)
2109 EXT4_FEATURE_RO_COMPAT_FUNCS(huge_file,		HUGE_FILE)
2110 EXT4_FEATURE_RO_COMPAT_FUNCS(gdt_csum,		GDT_CSUM)
2111 EXT4_FEATURE_RO_COMPAT_FUNCS(dir_nlink,		DIR_NLINK)
2112 EXT4_FEATURE_RO_COMPAT_FUNCS(extra_isize,	EXTRA_ISIZE)
2113 EXT4_FEATURE_RO_COMPAT_FUNCS(quota,		QUOTA)
2114 EXT4_FEATURE_RO_COMPAT_FUNCS(bigalloc,		BIGALLOC)
2115 EXT4_FEATURE_RO_COMPAT_FUNCS(metadata_csum,	METADATA_CSUM)
2116 EXT4_FEATURE_RO_COMPAT_FUNCS(readonly,		READONLY)
2117 EXT4_FEATURE_RO_COMPAT_FUNCS(project,		PROJECT)
2118 EXT4_FEATURE_RO_COMPAT_FUNCS(verity,		VERITY)
2119 EXT4_FEATURE_RO_COMPAT_FUNCS(orphan_present,	ORPHAN_PRESENT)
2120 
2121 EXT4_FEATURE_INCOMPAT_FUNCS(compression,	COMPRESSION)
2122 EXT4_FEATURE_INCOMPAT_FUNCS(filetype,		FILETYPE)
2123 EXT4_FEATURE_INCOMPAT_FUNCS(journal_needs_recovery,	RECOVER)
2124 EXT4_FEATURE_INCOMPAT_FUNCS(journal_dev,	JOURNAL_DEV)
2125 EXT4_FEATURE_INCOMPAT_FUNCS(meta_bg,		META_BG)
2126 EXT4_FEATURE_INCOMPAT_FUNCS(extents,		EXTENTS)
2127 EXT4_FEATURE_INCOMPAT_FUNCS(64bit,		64BIT)
2128 EXT4_FEATURE_INCOMPAT_FUNCS(mmp,		MMP)
2129 EXT4_FEATURE_INCOMPAT_FUNCS(flex_bg,		FLEX_BG)
2130 EXT4_FEATURE_INCOMPAT_FUNCS(ea_inode,		EA_INODE)
2131 EXT4_FEATURE_INCOMPAT_FUNCS(dirdata,		DIRDATA)
2132 EXT4_FEATURE_INCOMPAT_FUNCS(csum_seed,		CSUM_SEED)
2133 EXT4_FEATURE_INCOMPAT_FUNCS(largedir,		LARGEDIR)
2134 EXT4_FEATURE_INCOMPAT_FUNCS(inline_data,	INLINE_DATA)
2135 EXT4_FEATURE_INCOMPAT_FUNCS(encrypt,		ENCRYPT)
2136 EXT4_FEATURE_INCOMPAT_FUNCS(casefold,		CASEFOLD)
2137 
2138 #define EXT2_FEATURE_COMPAT_SUPP	EXT4_FEATURE_COMPAT_EXT_ATTR
2139 #define EXT2_FEATURE_INCOMPAT_SUPP	(EXT4_FEATURE_INCOMPAT_FILETYPE| \
2140 					 EXT4_FEATURE_INCOMPAT_META_BG)
2141 #define EXT2_FEATURE_RO_COMPAT_SUPP	(EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
2142 					 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
2143 					 EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
2144 
2145 #define EXT3_FEATURE_COMPAT_SUPP	EXT4_FEATURE_COMPAT_EXT_ATTR
2146 #define EXT3_FEATURE_INCOMPAT_SUPP	(EXT4_FEATURE_INCOMPAT_FILETYPE| \
2147 					 EXT4_FEATURE_INCOMPAT_RECOVER| \
2148 					 EXT4_FEATURE_INCOMPAT_META_BG)
2149 #define EXT3_FEATURE_RO_COMPAT_SUPP	(EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
2150 					 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
2151 					 EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
2152 
2153 #define EXT4_FEATURE_COMPAT_SUPP	(EXT4_FEATURE_COMPAT_EXT_ATTR| \
2154 					 EXT4_FEATURE_COMPAT_ORPHAN_FILE)
2155 #define EXT4_FEATURE_INCOMPAT_SUPP	(EXT4_FEATURE_INCOMPAT_FILETYPE| \
2156 					 EXT4_FEATURE_INCOMPAT_RECOVER| \
2157 					 EXT4_FEATURE_INCOMPAT_META_BG| \
2158 					 EXT4_FEATURE_INCOMPAT_EXTENTS| \
2159 					 EXT4_FEATURE_INCOMPAT_64BIT| \
2160 					 EXT4_FEATURE_INCOMPAT_FLEX_BG| \
2161 					 EXT4_FEATURE_INCOMPAT_EA_INODE| \
2162 					 EXT4_FEATURE_INCOMPAT_MMP | \
2163 					 EXT4_FEATURE_INCOMPAT_INLINE_DATA | \
2164 					 EXT4_FEATURE_INCOMPAT_ENCRYPT | \
2165 					 EXT4_FEATURE_INCOMPAT_CASEFOLD | \
2166 					 EXT4_FEATURE_INCOMPAT_CSUM_SEED | \
2167 					 EXT4_FEATURE_INCOMPAT_LARGEDIR)
2168 #define EXT4_FEATURE_RO_COMPAT_SUPP	(EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
2169 					 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
2170 					 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
2171 					 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
2172 					 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
2173 					 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
2174 					 EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\
2175 					 EXT4_FEATURE_RO_COMPAT_BIGALLOC |\
2176 					 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\
2177 					 EXT4_FEATURE_RO_COMPAT_QUOTA |\
2178 					 EXT4_FEATURE_RO_COMPAT_PROJECT |\
2179 					 EXT4_FEATURE_RO_COMPAT_VERITY |\
2180 					 EXT4_FEATURE_RO_COMPAT_ORPHAN_PRESENT)
2181 
2182 #define EXTN_FEATURE_FUNCS(ver) \
2183 static inline bool ext4_has_unknown_ext##ver##_compat_features(struct super_block *sb) \
2184 { \
2185 	return ((EXT4_SB(sb)->s_es->s_feature_compat & \
2186 		cpu_to_le32(~EXT##ver##_FEATURE_COMPAT_SUPP)) != 0); \
2187 } \
2188 static inline bool ext4_has_unknown_ext##ver##_ro_compat_features(struct super_block *sb) \
2189 { \
2190 	return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \
2191 		cpu_to_le32(~EXT##ver##_FEATURE_RO_COMPAT_SUPP)) != 0); \
2192 } \
2193 static inline bool ext4_has_unknown_ext##ver##_incompat_features(struct super_block *sb) \
2194 { \
2195 	return ((EXT4_SB(sb)->s_es->s_feature_incompat & \
2196 		cpu_to_le32(~EXT##ver##_FEATURE_INCOMPAT_SUPP)) != 0); \
2197 }
2198 
2199 EXTN_FEATURE_FUNCS(2)
2200 EXTN_FEATURE_FUNCS(3)
2201 EXTN_FEATURE_FUNCS(4)
2202 
2203 static inline bool ext4_has_compat_features(struct super_block *sb)
2204 {
2205 	return (EXT4_SB(sb)->s_es->s_feature_compat != 0);
2206 }
2207 static inline bool ext4_has_ro_compat_features(struct super_block *sb)
2208 {
2209 	return (EXT4_SB(sb)->s_es->s_feature_ro_compat != 0);
2210 }
2211 static inline bool ext4_has_incompat_features(struct super_block *sb)
2212 {
2213 	return (EXT4_SB(sb)->s_es->s_feature_incompat != 0);
2214 }
2215 
2216 extern int ext4_feature_set_ok(struct super_block *sb, int readonly);
2217 
2218 /*
2219  * Superblock flags
2220  */
2221 #define EXT4_FLAGS_RESIZING	0
2222 #define EXT4_FLAGS_SHUTDOWN	1
2223 #define EXT4_FLAGS_BDEV_IS_DAX	2
2224 
2225 static inline int ext4_forced_shutdown(struct ext4_sb_info *sbi)
2226 {
2227 	return test_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
2228 }
2229 
2230 /*
2231  * Default values for user and/or group using reserved blocks
2232  */
2233 #define	EXT4_DEF_RESUID		0
2234 #define	EXT4_DEF_RESGID		0
2235 
2236 /*
2237  * Default project ID
2238  */
2239 #define	EXT4_DEF_PROJID		0
2240 
2241 #define EXT4_DEF_INODE_READAHEAD_BLKS	32
2242 
2243 /*
2244  * Default mount options
2245  */
2246 #define EXT4_DEFM_DEBUG		0x0001
2247 #define EXT4_DEFM_BSDGROUPS	0x0002
2248 #define EXT4_DEFM_XATTR_USER	0x0004
2249 #define EXT4_DEFM_ACL		0x0008
2250 #define EXT4_DEFM_UID16		0x0010
2251 #define EXT4_DEFM_JMODE		0x0060
2252 #define EXT4_DEFM_JMODE_DATA	0x0020
2253 #define EXT4_DEFM_JMODE_ORDERED	0x0040
2254 #define EXT4_DEFM_JMODE_WBACK	0x0060
2255 #define EXT4_DEFM_NOBARRIER	0x0100
2256 #define EXT4_DEFM_BLOCK_VALIDITY 0x0200
2257 #define EXT4_DEFM_DISCARD	0x0400
2258 #define EXT4_DEFM_NODELALLOC	0x0800
2259 
2260 /*
2261  * Default journal batch times
2262  */
2263 #define EXT4_DEF_MIN_BATCH_TIME	0
2264 #define EXT4_DEF_MAX_BATCH_TIME	15000 /* 15ms */
2265 
2266 /*
2267  * Minimum number of groups in a flexgroup before we separate out
2268  * directories into the first block group of a flexgroup
2269  */
2270 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME	4
2271 
2272 /*
2273  * Structure of a directory entry
2274  */
2275 #define EXT4_NAME_LEN 255
2276 /*
2277  * Base length of the ext4 directory entry excluding the name length
2278  */
2279 #define EXT4_BASE_DIR_LEN (sizeof(struct ext4_dir_entry_2) - EXT4_NAME_LEN)
2280 
2281 struct ext4_dir_entry {
2282 	__le32	inode;			/* Inode number */
2283 	__le16	rec_len;		/* Directory entry length */
2284 	__le16	name_len;		/* Name length */
2285 	char	name[EXT4_NAME_LEN];	/* File name */
2286 };
2287 
2288 
2289 /*
2290  * Encrypted Casefolded entries require saving the hash on disk. This structure
2291  * followed ext4_dir_entry_2's name[name_len] at the next 4 byte aligned
2292  * boundary.
2293  */
2294 struct ext4_dir_entry_hash {
2295 	__le32 hash;
2296 	__le32 minor_hash;
2297 };
2298 
2299 /*
2300  * The new version of the directory entry.  Since EXT4 structures are
2301  * stored in intel byte order, and the name_len field could never be
2302  * bigger than 255 chars, it's safe to reclaim the extra byte for the
2303  * file_type field.
2304  */
2305 struct ext4_dir_entry_2 {
2306 	__le32	inode;			/* Inode number */
2307 	__le16	rec_len;		/* Directory entry length */
2308 	__u8	name_len;		/* Name length */
2309 	__u8	file_type;		/* See file type macros EXT4_FT_* below */
2310 	char	name[EXT4_NAME_LEN];	/* File name */
2311 };
2312 
2313 /*
2314  * Access the hashes at the end of ext4_dir_entry_2
2315  */
2316 #define EXT4_DIRENT_HASHES(entry) \
2317 	((struct ext4_dir_entry_hash *) \
2318 		(((void *)(entry)) + \
2319 		((8 + (entry)->name_len + EXT4_DIR_ROUND) & ~EXT4_DIR_ROUND)))
2320 #define EXT4_DIRENT_HASH(entry) le32_to_cpu(EXT4_DIRENT_HASHES(de)->hash)
2321 #define EXT4_DIRENT_MINOR_HASH(entry) \
2322 		le32_to_cpu(EXT4_DIRENT_HASHES(de)->minor_hash)
2323 
2324 static inline bool ext4_hash_in_dirent(const struct inode *inode)
2325 {
2326 	return IS_CASEFOLDED(inode) && IS_ENCRYPTED(inode);
2327 }
2328 
2329 /*
2330  * This is a bogus directory entry at the end of each leaf block that
2331  * records checksums.
2332  */
2333 struct ext4_dir_entry_tail {
2334 	__le32	det_reserved_zero1;	/* Pretend to be unused */
2335 	__le16	det_rec_len;		/* 12 */
2336 	__u8	det_reserved_zero2;	/* Zero name length */
2337 	__u8	det_reserved_ft;	/* 0xDE, fake file type */
2338 	__le32	det_checksum;		/* crc32c(uuid+inum+dirblock) */
2339 };
2340 
2341 #define EXT4_DIRENT_TAIL(block, blocksize) \
2342 	((struct ext4_dir_entry_tail *)(((void *)(block)) + \
2343 					((blocksize) - \
2344 					 sizeof(struct ext4_dir_entry_tail))))
2345 
2346 /*
2347  * Ext4 directory file types.  Only the low 3 bits are used.  The
2348  * other bits are reserved for now.
2349  */
2350 #define EXT4_FT_UNKNOWN		0
2351 #define EXT4_FT_REG_FILE	1
2352 #define EXT4_FT_DIR		2
2353 #define EXT4_FT_CHRDEV		3
2354 #define EXT4_FT_BLKDEV		4
2355 #define EXT4_FT_FIFO		5
2356 #define EXT4_FT_SOCK		6
2357 #define EXT4_FT_SYMLINK		7
2358 
2359 #define EXT4_FT_MAX		8
2360 
2361 #define EXT4_FT_DIR_CSUM	0xDE
2362 
2363 /*
2364  * EXT4_DIR_PAD defines the directory entries boundaries
2365  *
2366  * NOTE: It must be a multiple of 4
2367  */
2368 #define EXT4_DIR_PAD			4
2369 #define EXT4_DIR_ROUND			(EXT4_DIR_PAD - 1)
2370 #define EXT4_MAX_REC_LEN		((1<<16)-1)
2371 
2372 /*
2373  * The rec_len is dependent on the type of directory. Directories that are
2374  * casefolded and encrypted need to store the hash as well, so we add room for
2375  * ext4_extended_dir_entry_2. For all entries related to '.' or '..' you should
2376  * pass NULL for dir, as those entries do not use the extra fields.
2377  */
2378 static inline unsigned int ext4_dir_rec_len(__u8 name_len,
2379 						const struct inode *dir)
2380 {
2381 	int rec_len = (name_len + 8 + EXT4_DIR_ROUND);
2382 
2383 	if (dir && ext4_hash_in_dirent(dir))
2384 		rec_len += sizeof(struct ext4_dir_entry_hash);
2385 	return (rec_len & ~EXT4_DIR_ROUND);
2386 }
2387 
2388 /*
2389  * If we ever get support for fs block sizes > page_size, we'll need
2390  * to remove the #if statements in the next two functions...
2391  */
2392 static inline unsigned int
2393 ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize)
2394 {
2395 	unsigned len = le16_to_cpu(dlen);
2396 
2397 #if (PAGE_SIZE >= 65536)
2398 	if (len == EXT4_MAX_REC_LEN || len == 0)
2399 		return blocksize;
2400 	return (len & 65532) | ((len & 3) << 16);
2401 #else
2402 	return len;
2403 #endif
2404 }
2405 
2406 static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize)
2407 {
2408 	BUG_ON((len > blocksize) || (blocksize > (1 << 18)) || (len & 3));
2409 #if (PAGE_SIZE >= 65536)
2410 	if (len < 65536)
2411 		return cpu_to_le16(len);
2412 	if (len == blocksize) {
2413 		if (blocksize == 65536)
2414 			return cpu_to_le16(EXT4_MAX_REC_LEN);
2415 		else
2416 			return cpu_to_le16(0);
2417 	}
2418 	return cpu_to_le16((len & 65532) | ((len >> 16) & 3));
2419 #else
2420 	return cpu_to_le16(len);
2421 #endif
2422 }
2423 
2424 /*
2425  * Hash Tree Directory indexing
2426  * (c) Daniel Phillips, 2001
2427  */
2428 
2429 #define is_dx(dir) (ext4_has_feature_dir_index((dir)->i_sb) && \
2430 		    ext4_test_inode_flag((dir), EXT4_INODE_INDEX))
2431 #define EXT4_DIR_LINK_MAX(dir) unlikely((dir)->i_nlink >= EXT4_LINK_MAX && \
2432 		    !(ext4_has_feature_dir_nlink((dir)->i_sb) && is_dx(dir)))
2433 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
2434 
2435 /* Legal values for the dx_root hash_version field: */
2436 
2437 #define DX_HASH_LEGACY			0
2438 #define DX_HASH_HALF_MD4		1
2439 #define DX_HASH_TEA			2
2440 #define DX_HASH_LEGACY_UNSIGNED		3
2441 #define DX_HASH_HALF_MD4_UNSIGNED	4
2442 #define DX_HASH_TEA_UNSIGNED		5
2443 #define DX_HASH_SIPHASH			6
2444 
2445 static inline u32 ext4_chksum(struct ext4_sb_info *sbi, u32 crc,
2446 			      const void *address, unsigned int length)
2447 {
2448 	struct {
2449 		struct shash_desc shash;
2450 		char ctx[4];
2451 	} desc;
2452 
2453 	BUG_ON(crypto_shash_descsize(sbi->s_chksum_driver)!=sizeof(desc.ctx));
2454 
2455 	desc.shash.tfm = sbi->s_chksum_driver;
2456 	*(u32 *)desc.ctx = crc;
2457 
2458 	BUG_ON(crypto_shash_update(&desc.shash, address, length));
2459 
2460 	return *(u32 *)desc.ctx;
2461 }
2462 
2463 #ifdef __KERNEL__
2464 
2465 /* hash info structure used by the directory hash */
2466 struct dx_hash_info
2467 {
2468 	u32		hash;
2469 	u32		minor_hash;
2470 	int		hash_version;
2471 	u32		*seed;
2472 };
2473 
2474 
2475 /* 32 and 64 bit signed EOF for dx directories */
2476 #define EXT4_HTREE_EOF_32BIT   ((1UL  << (32 - 1)) - 1)
2477 #define EXT4_HTREE_EOF_64BIT   ((1ULL << (64 - 1)) - 1)
2478 
2479 
2480 /*
2481  * Control parameters used by ext4_htree_next_block
2482  */
2483 #define HASH_NB_ALWAYS		1
2484 
2485 struct ext4_filename {
2486 	const struct qstr *usr_fname;
2487 	struct fscrypt_str disk_name;
2488 	struct dx_hash_info hinfo;
2489 #ifdef CONFIG_FS_ENCRYPTION
2490 	struct fscrypt_str crypto_buf;
2491 #endif
2492 #if IS_ENABLED(CONFIG_UNICODE)
2493 	struct fscrypt_str cf_name;
2494 #endif
2495 };
2496 
2497 #define fname_name(p) ((p)->disk_name.name)
2498 #define fname_usr_name(p) ((p)->usr_fname->name)
2499 #define fname_len(p)  ((p)->disk_name.len)
2500 
2501 /*
2502  * Describe an inode's exact location on disk and in memory
2503  */
2504 struct ext4_iloc
2505 {
2506 	struct buffer_head *bh;
2507 	unsigned long offset;
2508 	ext4_group_t block_group;
2509 };
2510 
2511 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
2512 {
2513 	return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
2514 }
2515 
2516 static inline bool ext4_is_quota_file(struct inode *inode)
2517 {
2518 	return IS_NOQUOTA(inode) &&
2519 	       !(EXT4_I(inode)->i_flags & EXT4_EA_INODE_FL);
2520 }
2521 
2522 /*
2523  * This structure is stuffed into the struct file's private_data field
2524  * for directories.  It is where we put information so that we can do
2525  * readdir operations in hash tree order.
2526  */
2527 struct dir_private_info {
2528 	struct rb_root	root;
2529 	struct rb_node	*curr_node;
2530 	struct fname	*extra_fname;
2531 	loff_t		last_pos;
2532 	__u32		curr_hash;
2533 	__u32		curr_minor_hash;
2534 	__u32		next_hash;
2535 };
2536 
2537 /* calculate the first block number of the group */
2538 static inline ext4_fsblk_t
2539 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no)
2540 {
2541 	return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
2542 		le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
2543 }
2544 
2545 /*
2546  * Special error return code only used by dx_probe() and its callers.
2547  */
2548 #define ERR_BAD_DX_DIR	(-(MAX_ERRNO - 1))
2549 
2550 /* htree levels for ext4 */
2551 #define	EXT4_HTREE_LEVEL_COMPAT	2
2552 #define	EXT4_HTREE_LEVEL	3
2553 
2554 static inline int ext4_dir_htree_level(struct super_block *sb)
2555 {
2556 	return ext4_has_feature_largedir(sb) ?
2557 		EXT4_HTREE_LEVEL : EXT4_HTREE_LEVEL_COMPAT;
2558 }
2559 
2560 /*
2561  * Timeout and state flag for lazy initialization inode thread.
2562  */
2563 #define EXT4_DEF_LI_WAIT_MULT			10
2564 #define EXT4_DEF_LI_MAX_START_DELAY		5
2565 #define EXT4_LAZYINIT_QUIT			0x0001
2566 #define EXT4_LAZYINIT_RUNNING			0x0002
2567 
2568 /*
2569  * Lazy inode table initialization info
2570  */
2571 struct ext4_lazy_init {
2572 	unsigned long		li_state;
2573 	struct list_head	li_request_list;
2574 	struct mutex		li_list_mtx;
2575 };
2576 
2577 enum ext4_li_mode {
2578 	EXT4_LI_MODE_PREFETCH_BBITMAP,
2579 	EXT4_LI_MODE_ITABLE,
2580 };
2581 
2582 struct ext4_li_request {
2583 	struct super_block	*lr_super;
2584 	enum ext4_li_mode	lr_mode;
2585 	ext4_group_t		lr_first_not_zeroed;
2586 	ext4_group_t		lr_next_group;
2587 	struct list_head	lr_request;
2588 	unsigned long		lr_next_sched;
2589 	unsigned long		lr_timeout;
2590 };
2591 
2592 struct ext4_features {
2593 	struct kobject f_kobj;
2594 	struct completion f_kobj_unregister;
2595 };
2596 
2597 /*
2598  * This structure will be used for multiple mount protection. It will be
2599  * written into the block number saved in the s_mmp_block field in the
2600  * superblock. Programs that check MMP should assume that if
2601  * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe
2602  * to use the filesystem, regardless of how old the timestamp is.
2603  */
2604 #define EXT4_MMP_MAGIC     0x004D4D50U /* ASCII for MMP */
2605 #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */
2606 #define EXT4_MMP_SEQ_FSCK  0xE24D4D50U /* mmp_seq value when being fscked */
2607 #define EXT4_MMP_SEQ_MAX   0xE24D4D4FU /* maximum valid mmp_seq value */
2608 
2609 struct mmp_struct {
2610 	__le32	mmp_magic;		/* Magic number for MMP */
2611 	__le32	mmp_seq;		/* Sequence no. updated periodically */
2612 
2613 	/*
2614 	 * mmp_time, mmp_nodename & mmp_bdevname are only used for information
2615 	 * purposes and do not affect the correctness of the algorithm
2616 	 */
2617 	__le64	mmp_time;		/* Time last updated */
2618 	char	mmp_nodename[64];	/* Node which last updated MMP block */
2619 	char	mmp_bdevname[32];	/* Bdev which last updated MMP block */
2620 
2621 	/*
2622 	 * mmp_check_interval is used to verify if the MMP block has been
2623 	 * updated on the block device. The value is updated based on the
2624 	 * maximum time to write the MMP block during an update cycle.
2625 	 */
2626 	__le16	mmp_check_interval;
2627 
2628 	__le16	mmp_pad1;
2629 	__le32	mmp_pad2[226];
2630 	__le32	mmp_checksum;		/* crc32c(uuid+mmp_block) */
2631 };
2632 
2633 /* arguments passed to the mmp thread */
2634 struct mmpd_data {
2635 	struct buffer_head *bh; /* bh from initial read_mmp_block() */
2636 	struct super_block *sb;  /* super block of the fs */
2637 };
2638 
2639 /*
2640  * Check interval multiplier
2641  * The MMP block is written every update interval and initially checked every
2642  * update interval x the multiplier (the value is then adapted based on the
2643  * write latency). The reason is that writes can be delayed under load and we
2644  * don't want readers to incorrectly assume that the filesystem is no longer
2645  * in use.
2646  */
2647 #define EXT4_MMP_CHECK_MULT		2UL
2648 
2649 /*
2650  * Minimum interval for MMP checking in seconds.
2651  */
2652 #define EXT4_MMP_MIN_CHECK_INTERVAL	5UL
2653 
2654 /*
2655  * Maximum interval for MMP checking in seconds.
2656  */
2657 #define EXT4_MMP_MAX_CHECK_INTERVAL	300UL
2658 
2659 /*
2660  * Function prototypes
2661  */
2662 
2663 /*
2664  * Ok, these declarations are also in <linux/kernel.h> but none of the
2665  * ext4 source programs needs to include it so they are duplicated here.
2666  */
2667 # define NORET_TYPE	/**/
2668 # define ATTRIB_NORET	__attribute__((noreturn))
2669 # define NORET_AND	noreturn,
2670 
2671 /* bitmap.c */
2672 extern unsigned int ext4_count_free(char *bitmap, unsigned numchars);
2673 void ext4_inode_bitmap_csum_set(struct super_block *sb,
2674 				struct ext4_group_desc *gdp,
2675 				struct buffer_head *bh, int sz);
2676 int ext4_inode_bitmap_csum_verify(struct super_block *sb,
2677 				  struct ext4_group_desc *gdp,
2678 				  struct buffer_head *bh, int sz);
2679 void ext4_block_bitmap_csum_set(struct super_block *sb,
2680 				struct ext4_group_desc *gdp,
2681 				struct buffer_head *bh);
2682 int ext4_block_bitmap_csum_verify(struct super_block *sb,
2683 				  struct ext4_group_desc *gdp,
2684 				  struct buffer_head *bh);
2685 
2686 /* balloc.c */
2687 extern void ext4_get_group_no_and_offset(struct super_block *sb,
2688 					 ext4_fsblk_t blocknr,
2689 					 ext4_group_t *blockgrpp,
2690 					 ext4_grpblk_t *offsetp);
2691 extern ext4_group_t ext4_get_group_number(struct super_block *sb,
2692 					  ext4_fsblk_t block);
2693 
2694 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group);
2695 extern unsigned long ext4_bg_num_gdb(struct super_block *sb,
2696 			ext4_group_t group);
2697 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,
2698 					 ext4_fsblk_t goal,
2699 					 unsigned int flags,
2700 					 unsigned long *count,
2701 					 int *errp);
2702 extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi,
2703 				    s64 nclusters, unsigned int flags);
2704 extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *);
2705 extern void ext4_check_blocks_bitmap(struct super_block *);
2706 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
2707 						    ext4_group_t block_group,
2708 						    struct buffer_head ** bh);
2709 extern struct ext4_group_info *ext4_get_group_info(struct super_block *sb,
2710 						   ext4_group_t group);
2711 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
2712 
2713 extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb,
2714 						ext4_group_t block_group,
2715 						bool ignore_locked);
2716 extern int ext4_wait_block_bitmap(struct super_block *sb,
2717 				  ext4_group_t block_group,
2718 				  struct buffer_head *bh);
2719 extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb,
2720 						  ext4_group_t block_group);
2721 extern unsigned ext4_free_clusters_after_init(struct super_block *sb,
2722 					      ext4_group_t block_group,
2723 					      struct ext4_group_desc *gdp);
2724 ext4_fsblk_t ext4_inode_to_goal_block(struct inode *);
2725 
2726 #if IS_ENABLED(CONFIG_UNICODE)
2727 extern int ext4_fname_setup_ci_filename(struct inode *dir,
2728 					 const struct qstr *iname,
2729 					 struct ext4_filename *fname);
2730 #endif
2731 
2732 /* ext4 encryption related stuff goes here crypto.c */
2733 #ifdef CONFIG_FS_ENCRYPTION
2734 extern const struct fscrypt_operations ext4_cryptops;
2735 
2736 int ext4_fname_setup_filename(struct inode *dir, const struct qstr *iname,
2737 			      int lookup, struct ext4_filename *fname);
2738 
2739 int ext4_fname_prepare_lookup(struct inode *dir, struct dentry *dentry,
2740 			      struct ext4_filename *fname);
2741 
2742 void ext4_fname_free_filename(struct ext4_filename *fname);
2743 
2744 int ext4_ioctl_get_encryption_pwsalt(struct file *filp, void __user *arg);
2745 
2746 #else /* !CONFIG_FS_ENCRYPTION */
2747 static inline int ext4_fname_setup_filename(struct inode *dir,
2748 					    const struct qstr *iname,
2749 					    int lookup,
2750 					    struct ext4_filename *fname)
2751 {
2752 	int err = 0;
2753 	fname->usr_fname = iname;
2754 	fname->disk_name.name = (unsigned char *) iname->name;
2755 	fname->disk_name.len = iname->len;
2756 
2757 #if IS_ENABLED(CONFIG_UNICODE)
2758 	err = ext4_fname_setup_ci_filename(dir, iname, fname);
2759 #endif
2760 
2761 	return err;
2762 }
2763 
2764 static inline int ext4_fname_prepare_lookup(struct inode *dir,
2765 					    struct dentry *dentry,
2766 					    struct ext4_filename *fname)
2767 {
2768 	return ext4_fname_setup_filename(dir, &dentry->d_name, 1, fname);
2769 }
2770 
2771 static inline void ext4_fname_free_filename(struct ext4_filename *fname)
2772 {
2773 #if IS_ENABLED(CONFIG_UNICODE)
2774 	kfree(fname->cf_name.name);
2775 	fname->cf_name.name = NULL;
2776 #endif
2777 }
2778 
2779 static inline int ext4_ioctl_get_encryption_pwsalt(struct file *filp,
2780 						   void __user *arg)
2781 {
2782 	return -EOPNOTSUPP;
2783 }
2784 #endif /* !CONFIG_FS_ENCRYPTION */
2785 
2786 /* dir.c */
2787 extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *,
2788 				  struct file *,
2789 				  struct ext4_dir_entry_2 *,
2790 				  struct buffer_head *, char *, int,
2791 				  unsigned int);
2792 #define ext4_check_dir_entry(dir, filp, de, bh, buf, size, offset) \
2793 	unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \
2794 				(de), (bh), (buf), (size), (offset)))
2795 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
2796 				__u32 minor_hash,
2797 				struct ext4_dir_entry_2 *dirent,
2798 				struct fscrypt_str *ent_name);
2799 extern void ext4_htree_free_dir_info(struct dir_private_info *p);
2800 extern int ext4_find_dest_de(struct inode *dir, struct inode *inode,
2801 			     struct buffer_head *bh,
2802 			     void *buf, int buf_size,
2803 			     struct ext4_filename *fname,
2804 			     struct ext4_dir_entry_2 **dest_de);
2805 void ext4_insert_dentry(struct inode *dir, struct inode *inode,
2806 			struct ext4_dir_entry_2 *de,
2807 			int buf_size,
2808 			struct ext4_filename *fname);
2809 static inline void ext4_update_dx_flag(struct inode *inode)
2810 {
2811 	if (!ext4_has_feature_dir_index(inode->i_sb) &&
2812 	    ext4_test_inode_flag(inode, EXT4_INODE_INDEX)) {
2813 		/* ext4_iget() should have caught this... */
2814 		WARN_ON_ONCE(ext4_has_feature_metadata_csum(inode->i_sb));
2815 		ext4_clear_inode_flag(inode, EXT4_INODE_INDEX);
2816 	}
2817 }
2818 static const unsigned char ext4_filetype_table[] = {
2819 	DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK
2820 };
2821 
2822 static inline  unsigned char get_dtype(struct super_block *sb, int filetype)
2823 {
2824 	if (!ext4_has_feature_filetype(sb) || filetype >= EXT4_FT_MAX)
2825 		return DT_UNKNOWN;
2826 
2827 	return ext4_filetype_table[filetype];
2828 }
2829 extern int ext4_check_all_de(struct inode *dir, struct buffer_head *bh,
2830 			     void *buf, int buf_size);
2831 
2832 /* fsync.c */
2833 extern int ext4_sync_file(struct file *, loff_t, loff_t, int);
2834 
2835 /* hash.c */
2836 extern int ext4fs_dirhash(const struct inode *dir, const char *name, int len,
2837 			  struct dx_hash_info *hinfo);
2838 
2839 /* ialloc.c */
2840 extern int ext4_mark_inode_used(struct super_block *sb, int ino);
2841 extern struct inode *__ext4_new_inode(struct mnt_idmap *, handle_t *,
2842 				      struct inode *, umode_t,
2843 				      const struct qstr *qstr, __u32 goal,
2844 				      uid_t *owner, __u32 i_flags,
2845 				      int handle_type, unsigned int line_no,
2846 				      int nblocks);
2847 
2848 #define ext4_new_inode(handle, dir, mode, qstr, goal, owner, i_flags)          \
2849 	__ext4_new_inode(&nop_mnt_idmap, (handle), (dir), (mode), (qstr),      \
2850 			 (goal), (owner), i_flags, 0, 0, 0)
2851 #define ext4_new_inode_start_handle(idmap, dir, mode, qstr, goal, owner, \
2852 				    type, nblocks)		    \
2853 	__ext4_new_inode((idmap), NULL, (dir), (mode), (qstr), (goal), (owner), \
2854 			 0, (type), __LINE__, (nblocks))
2855 
2856 
2857 extern void ext4_free_inode(handle_t *, struct inode *);
2858 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long);
2859 extern unsigned long ext4_count_free_inodes(struct super_block *);
2860 extern unsigned long ext4_count_dirs(struct super_block *);
2861 extern void ext4_check_inodes_bitmap(struct super_block *);
2862 extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap);
2863 extern int ext4_init_inode_table(struct super_block *sb,
2864 				 ext4_group_t group, int barrier);
2865 extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate);
2866 
2867 /* fast_commit.c */
2868 int ext4_fc_info_show(struct seq_file *seq, void *v);
2869 void ext4_fc_init(struct super_block *sb, journal_t *journal);
2870 void ext4_fc_init_inode(struct inode *inode);
2871 void ext4_fc_track_range(handle_t *handle, struct inode *inode, ext4_lblk_t start,
2872 			 ext4_lblk_t end);
2873 void __ext4_fc_track_unlink(handle_t *handle, struct inode *inode,
2874 	struct dentry *dentry);
2875 void __ext4_fc_track_link(handle_t *handle, struct inode *inode,
2876 	struct dentry *dentry);
2877 void ext4_fc_track_unlink(handle_t *handle, struct dentry *dentry);
2878 void ext4_fc_track_link(handle_t *handle, struct dentry *dentry);
2879 void __ext4_fc_track_create(handle_t *handle, struct inode *inode,
2880 			    struct dentry *dentry);
2881 void ext4_fc_track_create(handle_t *handle, struct dentry *dentry);
2882 void ext4_fc_track_inode(handle_t *handle, struct inode *inode);
2883 void ext4_fc_mark_ineligible(struct super_block *sb, int reason, handle_t *handle);
2884 void ext4_fc_start_update(struct inode *inode);
2885 void ext4_fc_stop_update(struct inode *inode);
2886 void ext4_fc_del(struct inode *inode);
2887 bool ext4_fc_replay_check_excluded(struct super_block *sb, ext4_fsblk_t block);
2888 void ext4_fc_replay_cleanup(struct super_block *sb);
2889 int ext4_fc_commit(journal_t *journal, tid_t commit_tid);
2890 int __init ext4_fc_init_dentry_cache(void);
2891 void ext4_fc_destroy_dentry_cache(void);
2892 int ext4_fc_record_regions(struct super_block *sb, int ino,
2893 			   ext4_lblk_t lblk, ext4_fsblk_t pblk,
2894 			   int len, int replay);
2895 
2896 /* mballoc.c */
2897 extern const struct seq_operations ext4_mb_seq_groups_ops;
2898 extern const struct seq_operations ext4_mb_seq_structs_summary_ops;
2899 extern int ext4_seq_mb_stats_show(struct seq_file *seq, void *offset);
2900 extern int ext4_mb_init(struct super_block *);
2901 extern int ext4_mb_release(struct super_block *);
2902 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *,
2903 				struct ext4_allocation_request *, int *);
2904 extern int ext4_mb_reserve_blocks(struct super_block *, int);
2905 extern void ext4_discard_preallocations(struct inode *, unsigned int);
2906 extern int __init ext4_init_mballoc(void);
2907 extern void ext4_exit_mballoc(void);
2908 extern ext4_group_t ext4_mb_prefetch(struct super_block *sb,
2909 				     ext4_group_t group,
2910 				     unsigned int nr, int *cnt);
2911 extern void ext4_mb_prefetch_fini(struct super_block *sb, ext4_group_t group,
2912 				  unsigned int nr);
2913 
2914 extern void ext4_free_blocks(handle_t *handle, struct inode *inode,
2915 			     struct buffer_head *bh, ext4_fsblk_t block,
2916 			     unsigned long count, int flags);
2917 extern int ext4_mb_alloc_groupinfo(struct super_block *sb,
2918 				   ext4_group_t ngroups);
2919 extern int ext4_mb_add_groupinfo(struct super_block *sb,
2920 		ext4_group_t i, struct ext4_group_desc *desc);
2921 extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb,
2922 				ext4_fsblk_t block, unsigned long count);
2923 extern int ext4_trim_fs(struct super_block *, struct fstrim_range *);
2924 extern void ext4_process_freed_data(struct super_block *sb, tid_t commit_tid);
2925 extern void ext4_mb_mark_bb(struct super_block *sb, ext4_fsblk_t block,
2926 		       int len, int state);
2927 
2928 /* inode.c */
2929 void ext4_inode_csum_set(struct inode *inode, struct ext4_inode *raw,
2930 			 struct ext4_inode_info *ei);
2931 int ext4_inode_is_fast_symlink(struct inode *inode);
2932 struct buffer_head *ext4_getblk(handle_t *, struct inode *, ext4_lblk_t, int);
2933 struct buffer_head *ext4_bread(handle_t *, struct inode *, ext4_lblk_t, int);
2934 int ext4_bread_batch(struct inode *inode, ext4_lblk_t block, int bh_count,
2935 		     bool wait, struct buffer_head **bhs);
2936 int ext4_get_block_unwritten(struct inode *inode, sector_t iblock,
2937 			     struct buffer_head *bh_result, int create);
2938 int ext4_get_block(struct inode *inode, sector_t iblock,
2939 		   struct buffer_head *bh_result, int create);
2940 int ext4_da_get_block_prep(struct inode *inode, sector_t iblock,
2941 			   struct buffer_head *bh, int create);
2942 int ext4_walk_page_buffers(handle_t *handle,
2943 			   struct inode *inode,
2944 			   struct buffer_head *head,
2945 			   unsigned from,
2946 			   unsigned to,
2947 			   int *partial,
2948 			   int (*fn)(handle_t *handle, struct inode *inode,
2949 				     struct buffer_head *bh));
2950 int do_journal_get_write_access(handle_t *handle, struct inode *inode,
2951 				struct buffer_head *bh);
2952 #define FALL_BACK_TO_NONDELALLOC 1
2953 #define CONVERT_INLINE_DATA	 2
2954 
2955 typedef enum {
2956 	EXT4_IGET_NORMAL =	0,
2957 	EXT4_IGET_SPECIAL =	0x0001, /* OK to iget a system inode */
2958 	EXT4_IGET_HANDLE = 	0x0002,	/* Inode # is from a handle */
2959 	EXT4_IGET_BAD =		0x0004, /* Allow to iget a bad inode */
2960 	EXT4_IGET_EA_INODE =	0x0008	/* Inode should contain an EA value */
2961 } ext4_iget_flags;
2962 
2963 extern struct inode *__ext4_iget(struct super_block *sb, unsigned long ino,
2964 				 ext4_iget_flags flags, const char *function,
2965 				 unsigned int line);
2966 
2967 #define ext4_iget(sb, ino, flags) \
2968 	__ext4_iget((sb), (ino), (flags), __func__, __LINE__)
2969 
2970 extern int  ext4_write_inode(struct inode *, struct writeback_control *);
2971 extern int  ext4_setattr(struct mnt_idmap *, struct dentry *,
2972 			 struct iattr *);
2973 extern u32  ext4_dio_alignment(struct inode *inode);
2974 extern int  ext4_getattr(struct mnt_idmap *, const struct path *,
2975 			 struct kstat *, u32, unsigned int);
2976 extern void ext4_evict_inode(struct inode *);
2977 extern void ext4_clear_inode(struct inode *);
2978 extern int  ext4_file_getattr(struct mnt_idmap *, const struct path *,
2979 			      struct kstat *, u32, unsigned int);
2980 extern int  ext4_sync_inode(handle_t *, struct inode *);
2981 extern void ext4_dirty_inode(struct inode *, int);
2982 extern int ext4_change_inode_journal_flag(struct inode *, int);
2983 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
2984 extern int ext4_get_fc_inode_loc(struct super_block *sb, unsigned long ino,
2985 			  struct ext4_iloc *iloc);
2986 extern int ext4_inode_attach_jinode(struct inode *inode);
2987 extern int ext4_can_truncate(struct inode *inode);
2988 extern int ext4_truncate(struct inode *);
2989 extern int ext4_break_layouts(struct inode *);
2990 extern int ext4_punch_hole(struct file *file, loff_t offset, loff_t length);
2991 extern void ext4_set_inode_flags(struct inode *, bool init);
2992 extern int ext4_alloc_da_blocks(struct inode *inode);
2993 extern void ext4_set_aops(struct inode *inode);
2994 extern int ext4_writepage_trans_blocks(struct inode *);
2995 extern int ext4_normal_submit_inode_data_buffers(struct jbd2_inode *jinode);
2996 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks);
2997 extern int ext4_zero_partial_blocks(handle_t *handle, struct inode *inode,
2998 			     loff_t lstart, loff_t lend);
2999 extern vm_fault_t ext4_page_mkwrite(struct vm_fault *vmf);
3000 extern qsize_t *ext4_get_reserved_space(struct inode *inode);
3001 extern int ext4_get_projid(struct inode *inode, kprojid_t *projid);
3002 extern void ext4_da_release_space(struct inode *inode, int to_free);
3003 extern void ext4_da_update_reserve_space(struct inode *inode,
3004 					int used, int quota_claim);
3005 extern int ext4_issue_zeroout(struct inode *inode, ext4_lblk_t lblk,
3006 			      ext4_fsblk_t pblk, ext4_lblk_t len);
3007 
3008 /* indirect.c */
3009 extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode,
3010 				struct ext4_map_blocks *map, int flags);
3011 extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks);
3012 extern void ext4_ind_truncate(handle_t *, struct inode *inode);
3013 extern int ext4_ind_remove_space(handle_t *handle, struct inode *inode,
3014 				 ext4_lblk_t start, ext4_lblk_t end);
3015 
3016 /* ioctl.c */
3017 extern long ext4_ioctl(struct file *, unsigned int, unsigned long);
3018 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long);
3019 int ext4_fileattr_set(struct mnt_idmap *idmap,
3020 		      struct dentry *dentry, struct fileattr *fa);
3021 int ext4_fileattr_get(struct dentry *dentry, struct fileattr *fa);
3022 extern void ext4_reset_inode_seed(struct inode *inode);
3023 int ext4_update_overhead(struct super_block *sb, bool force);
3024 int ext4_force_shutdown(struct super_block *sb, u32 flags);
3025 
3026 /* migrate.c */
3027 extern int ext4_ext_migrate(struct inode *);
3028 extern int ext4_ind_migrate(struct inode *inode);
3029 
3030 /* namei.c */
3031 extern int ext4_init_new_dir(handle_t *handle, struct inode *dir,
3032 			     struct inode *inode);
3033 extern int ext4_dirblock_csum_verify(struct inode *inode,
3034 				     struct buffer_head *bh);
3035 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
3036 				__u32 start_minor_hash, __u32 *next_hash);
3037 extern int ext4_search_dir(struct buffer_head *bh,
3038 			   char *search_buf,
3039 			   int buf_size,
3040 			   struct inode *dir,
3041 			   struct ext4_filename *fname,
3042 			   unsigned int offset,
3043 			   struct ext4_dir_entry_2 **res_dir);
3044 extern int ext4_generic_delete_entry(struct inode *dir,
3045 				     struct ext4_dir_entry_2 *de_del,
3046 				     struct buffer_head *bh,
3047 				     void *entry_buf,
3048 				     int buf_size,
3049 				     int csum_size);
3050 extern bool ext4_empty_dir(struct inode *inode);
3051 
3052 /* resize.c */
3053 extern void ext4_kvfree_array_rcu(void *to_free);
3054 extern int ext4_group_add(struct super_block *sb,
3055 				struct ext4_new_group_data *input);
3056 extern int ext4_group_extend(struct super_block *sb,
3057 				struct ext4_super_block *es,
3058 				ext4_fsblk_t n_blocks_count);
3059 extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count);
3060 extern unsigned int ext4_list_backups(struct super_block *sb,
3061 				      unsigned int *three, unsigned int *five,
3062 				      unsigned int *seven);
3063 
3064 /* super.c */
3065 extern struct buffer_head *ext4_sb_bread(struct super_block *sb,
3066 					 sector_t block, blk_opf_t op_flags);
3067 extern struct buffer_head *ext4_sb_bread_unmovable(struct super_block *sb,
3068 						   sector_t block);
3069 extern void ext4_read_bh_nowait(struct buffer_head *bh, blk_opf_t op_flags,
3070 				bh_end_io_t *end_io);
3071 extern int ext4_read_bh(struct buffer_head *bh, blk_opf_t op_flags,
3072 			bh_end_io_t *end_io);
3073 extern int ext4_read_bh_lock(struct buffer_head *bh, blk_opf_t op_flags, bool wait);
3074 extern void ext4_sb_breadahead_unmovable(struct super_block *sb, sector_t block);
3075 extern int ext4_seq_options_show(struct seq_file *seq, void *offset);
3076 extern int ext4_calculate_overhead(struct super_block *sb);
3077 extern __le32 ext4_superblock_csum(struct super_block *sb,
3078 				   struct ext4_super_block *es);
3079 extern void ext4_superblock_csum_set(struct super_block *sb);
3080 extern int ext4_alloc_flex_bg_array(struct super_block *sb,
3081 				    ext4_group_t ngroup);
3082 extern const char *ext4_decode_error(struct super_block *sb, int errno,
3083 				     char nbuf[16]);
3084 extern void ext4_mark_group_bitmap_corrupted(struct super_block *sb,
3085 					     ext4_group_t block_group,
3086 					     unsigned int flags);
3087 
3088 extern __printf(7, 8)
3089 void __ext4_error(struct super_block *, const char *, unsigned int, bool,
3090 		  int, __u64, const char *, ...);
3091 extern __printf(6, 7)
3092 void __ext4_error_inode(struct inode *, const char *, unsigned int,
3093 			ext4_fsblk_t, int, const char *, ...);
3094 extern __printf(5, 6)
3095 void __ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t,
3096 		     const char *, ...);
3097 extern void __ext4_std_error(struct super_block *, const char *,
3098 			     unsigned int, int);
3099 extern __printf(4, 5)
3100 void __ext4_warning(struct super_block *, const char *, unsigned int,
3101 		    const char *, ...);
3102 extern __printf(4, 5)
3103 void __ext4_warning_inode(const struct inode *inode, const char *function,
3104 			  unsigned int line, const char *fmt, ...);
3105 extern __printf(3, 4)
3106 void __ext4_msg(struct super_block *, const char *, const char *, ...);
3107 extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp,
3108 			   const char *, unsigned int, const char *);
3109 extern __printf(7, 8)
3110 void __ext4_grp_locked_error(const char *, unsigned int,
3111 			     struct super_block *, ext4_group_t,
3112 			     unsigned long, ext4_fsblk_t,
3113 			     const char *, ...);
3114 
3115 #define EXT4_ERROR_INODE(inode, fmt, a...) \
3116 	ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a)
3117 
3118 #define EXT4_ERROR_INODE_ERR(inode, err, fmt, a...)			\
3119 	__ext4_error_inode((inode), __func__, __LINE__, 0, (err), (fmt), ## a)
3120 
3121 #define ext4_error_inode_block(inode, block, err, fmt, a...)		\
3122 	__ext4_error_inode((inode), __func__, __LINE__, (block), (err),	\
3123 			   (fmt), ## a)
3124 
3125 #define EXT4_ERROR_FILE(file, block, fmt, a...)				\
3126 	ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a)
3127 
3128 #define ext4_abort(sb, err, fmt, a...)					\
3129 	__ext4_error((sb), __func__, __LINE__, true, (err), 0, (fmt), ## a)
3130 
3131 #ifdef CONFIG_PRINTK
3132 
3133 #define ext4_error_inode(inode, func, line, block, fmt, ...)		\
3134 	__ext4_error_inode(inode, func, line, block, 0, fmt, ##__VA_ARGS__)
3135 #define ext4_error_inode_err(inode, func, line, block, err, fmt, ...)	\
3136 	__ext4_error_inode((inode), (func), (line), (block), 		\
3137 			   (err), (fmt), ##__VA_ARGS__)
3138 #define ext4_error_file(file, func, line, block, fmt, ...)		\
3139 	__ext4_error_file(file, func, line, block, fmt, ##__VA_ARGS__)
3140 #define ext4_error(sb, fmt, ...)					\
3141 	__ext4_error((sb), __func__, __LINE__, false, 0, 0, (fmt),	\
3142 		##__VA_ARGS__)
3143 #define ext4_error_err(sb, err, fmt, ...)				\
3144 	__ext4_error((sb), __func__, __LINE__, false, (err), 0, (fmt),	\
3145 		##__VA_ARGS__)
3146 #define ext4_warning(sb, fmt, ...)					\
3147 	__ext4_warning(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
3148 #define ext4_warning_inode(inode, fmt, ...)				\
3149 	__ext4_warning_inode(inode, __func__, __LINE__, fmt, ##__VA_ARGS__)
3150 #define ext4_msg(sb, level, fmt, ...)				\
3151 	__ext4_msg(sb, level, fmt, ##__VA_ARGS__)
3152 #define dump_mmp_msg(sb, mmp, msg)					\
3153 	__dump_mmp_msg(sb, mmp, __func__, __LINE__, msg)
3154 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...)		\
3155 	__ext4_grp_locked_error(__func__, __LINE__, sb, grp, ino, block, \
3156 				fmt, ##__VA_ARGS__)
3157 
3158 #else
3159 
3160 #define ext4_error_inode(inode, func, line, block, fmt, ...)		\
3161 do {									\
3162 	no_printk(fmt, ##__VA_ARGS__);					\
3163 	__ext4_error_inode(inode, "", 0, block, 0, " ");		\
3164 } while (0)
3165 #define ext4_error_inode_err(inode, func, line, block, err, fmt, ...)	\
3166 do {									\
3167 	no_printk(fmt, ##__VA_ARGS__);					\
3168 	__ext4_error_inode(inode, "", 0, block, err, " ");		\
3169 } while (0)
3170 #define ext4_error_file(file, func, line, block, fmt, ...)		\
3171 do {									\
3172 	no_printk(fmt, ##__VA_ARGS__);					\
3173 	__ext4_error_file(file, "", 0, block, " ");			\
3174 } while (0)
3175 #define ext4_error(sb, fmt, ...)					\
3176 do {									\
3177 	no_printk(fmt, ##__VA_ARGS__);					\
3178 	__ext4_error(sb, "", 0, false, 0, 0, " ");			\
3179 } while (0)
3180 #define ext4_error_err(sb, err, fmt, ...)				\
3181 do {									\
3182 	no_printk(fmt, ##__VA_ARGS__);					\
3183 	__ext4_error(sb, "", 0, false, err, 0, " ");			\
3184 } while (0)
3185 #define ext4_warning(sb, fmt, ...)					\
3186 do {									\
3187 	no_printk(fmt, ##__VA_ARGS__);					\
3188 	__ext4_warning(sb, "", 0, " ");					\
3189 } while (0)
3190 #define ext4_warning_inode(inode, fmt, ...)				\
3191 do {									\
3192 	no_printk(fmt, ##__VA_ARGS__);					\
3193 	__ext4_warning_inode(inode, "", 0, " ");			\
3194 } while (0)
3195 #define ext4_msg(sb, level, fmt, ...)					\
3196 do {									\
3197 	no_printk(fmt, ##__VA_ARGS__);					\
3198 	__ext4_msg(sb, "", " ");					\
3199 } while (0)
3200 #define dump_mmp_msg(sb, mmp, msg)					\
3201 	__dump_mmp_msg(sb, mmp, "", 0, "")
3202 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...)		\
3203 do {									\
3204 	no_printk(fmt, ##__VA_ARGS__);				\
3205 	__ext4_grp_locked_error("", 0, sb, grp, ino, block, " ");	\
3206 } while (0)
3207 
3208 #endif
3209 
3210 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
3211 				      struct ext4_group_desc *bg);
3212 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
3213 				      struct ext4_group_desc *bg);
3214 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
3215 				     struct ext4_group_desc *bg);
3216 extern __u32 ext4_free_group_clusters(struct super_block *sb,
3217 				      struct ext4_group_desc *bg);
3218 extern __u32 ext4_free_inodes_count(struct super_block *sb,
3219 				 struct ext4_group_desc *bg);
3220 extern __u32 ext4_used_dirs_count(struct super_block *sb,
3221 				struct ext4_group_desc *bg);
3222 extern __u32 ext4_itable_unused_count(struct super_block *sb,
3223 				   struct ext4_group_desc *bg);
3224 extern void ext4_block_bitmap_set(struct super_block *sb,
3225 				  struct ext4_group_desc *bg, ext4_fsblk_t blk);
3226 extern void ext4_inode_bitmap_set(struct super_block *sb,
3227 				  struct ext4_group_desc *bg, ext4_fsblk_t blk);
3228 extern void ext4_inode_table_set(struct super_block *sb,
3229 				 struct ext4_group_desc *bg, ext4_fsblk_t blk);
3230 extern void ext4_free_group_clusters_set(struct super_block *sb,
3231 					 struct ext4_group_desc *bg,
3232 					 __u32 count);
3233 extern void ext4_free_inodes_set(struct super_block *sb,
3234 				struct ext4_group_desc *bg, __u32 count);
3235 extern void ext4_used_dirs_set(struct super_block *sb,
3236 				struct ext4_group_desc *bg, __u32 count);
3237 extern void ext4_itable_unused_set(struct super_block *sb,
3238 				   struct ext4_group_desc *bg, __u32 count);
3239 extern int ext4_group_desc_csum_verify(struct super_block *sb, __u32 group,
3240 				       struct ext4_group_desc *gdp);
3241 extern void ext4_group_desc_csum_set(struct super_block *sb, __u32 group,
3242 				     struct ext4_group_desc *gdp);
3243 extern int ext4_register_li_request(struct super_block *sb,
3244 				    ext4_group_t first_not_zeroed);
3245 
3246 static inline int ext4_has_metadata_csum(struct super_block *sb)
3247 {
3248 	WARN_ON_ONCE(ext4_has_feature_metadata_csum(sb) &&
3249 		     !EXT4_SB(sb)->s_chksum_driver);
3250 
3251 	return ext4_has_feature_metadata_csum(sb) &&
3252 	       (EXT4_SB(sb)->s_chksum_driver != NULL);
3253 }
3254 
3255 static inline int ext4_has_group_desc_csum(struct super_block *sb)
3256 {
3257 	return ext4_has_feature_gdt_csum(sb) || ext4_has_metadata_csum(sb);
3258 }
3259 
3260 #define ext4_read_incompat_64bit_val(es, name) \
3261 	(((es)->s_feature_incompat & cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT) \
3262 		? (ext4_fsblk_t)le32_to_cpu(es->name##_hi) << 32 : 0) | \
3263 		le32_to_cpu(es->name##_lo))
3264 
3265 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
3266 {
3267 	return ext4_read_incompat_64bit_val(es, s_blocks_count);
3268 }
3269 
3270 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
3271 {
3272 	return ext4_read_incompat_64bit_val(es, s_r_blocks_count);
3273 }
3274 
3275 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
3276 {
3277 	return ext4_read_incompat_64bit_val(es, s_free_blocks_count);
3278 }
3279 
3280 static inline void ext4_blocks_count_set(struct ext4_super_block *es,
3281 					 ext4_fsblk_t blk)
3282 {
3283 	es->s_blocks_count_lo = cpu_to_le32((u32)blk);
3284 	es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
3285 }
3286 
3287 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
3288 					      ext4_fsblk_t blk)
3289 {
3290 	es->s_free_blocks_count_lo = cpu_to_le32((u32)blk);
3291 	es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
3292 }
3293 
3294 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
3295 					   ext4_fsblk_t blk)
3296 {
3297 	es->s_r_blocks_count_lo = cpu_to_le32((u32)blk);
3298 	es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
3299 }
3300 
3301 static inline loff_t ext4_isize(struct super_block *sb,
3302 				struct ext4_inode *raw_inode)
3303 {
3304 	if (ext4_has_feature_largedir(sb) ||
3305 	    S_ISREG(le16_to_cpu(raw_inode->i_mode)))
3306 		return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) |
3307 			le32_to_cpu(raw_inode->i_size_lo);
3308 
3309 	return (loff_t) le32_to_cpu(raw_inode->i_size_lo);
3310 }
3311 
3312 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size)
3313 {
3314 	raw_inode->i_size_lo = cpu_to_le32(i_size);
3315 	raw_inode->i_size_high = cpu_to_le32(i_size >> 32);
3316 }
3317 
3318 /*
3319  * Reading s_groups_count requires using smp_rmb() afterwards.  See
3320  * the locking protocol documented in the comments of ext4_group_add()
3321  * in resize.c
3322  */
3323 static inline ext4_group_t ext4_get_groups_count(struct super_block *sb)
3324 {
3325 	ext4_group_t	ngroups = EXT4_SB(sb)->s_groups_count;
3326 
3327 	smp_rmb();
3328 	return ngroups;
3329 }
3330 
3331 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi,
3332 					     ext4_group_t block_group)
3333 {
3334 	return block_group >> sbi->s_log_groups_per_flex;
3335 }
3336 
3337 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi)
3338 {
3339 	return 1 << sbi->s_log_groups_per_flex;
3340 }
3341 
3342 #define ext4_std_error(sb, errno)				\
3343 do {								\
3344 	if ((errno))						\
3345 		__ext4_std_error((sb), __func__, __LINE__, (errno));	\
3346 } while (0)
3347 
3348 #ifdef CONFIG_SMP
3349 /* Each CPU can accumulate percpu_counter_batch clusters in their local
3350  * counters. So we need to make sure we have free clusters more
3351  * than percpu_counter_batch  * nr_cpu_ids. Also add a window of 4 times.
3352  */
3353 #define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids))
3354 #else
3355 #define EXT4_FREECLUSTERS_WATERMARK 0
3356 #endif
3357 
3358 /* Update i_disksize. Requires i_rwsem to avoid races with truncate */
3359 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize)
3360 {
3361 	WARN_ON_ONCE(S_ISREG(inode->i_mode) &&
3362 		     !inode_is_locked(inode));
3363 	down_write(&EXT4_I(inode)->i_data_sem);
3364 	if (newsize > EXT4_I(inode)->i_disksize)
3365 		WRITE_ONCE(EXT4_I(inode)->i_disksize, newsize);
3366 	up_write(&EXT4_I(inode)->i_data_sem);
3367 }
3368 
3369 /* Update i_size, i_disksize. Requires i_rwsem to avoid races with truncate */
3370 static inline int ext4_update_inode_size(struct inode *inode, loff_t newsize)
3371 {
3372 	int changed = 0;
3373 
3374 	if (newsize > inode->i_size) {
3375 		i_size_write(inode, newsize);
3376 		changed = 1;
3377 	}
3378 	if (newsize > EXT4_I(inode)->i_disksize) {
3379 		ext4_update_i_disksize(inode, newsize);
3380 		changed |= 2;
3381 	}
3382 	return changed;
3383 }
3384 
3385 int ext4_update_disksize_before_punch(struct inode *inode, loff_t offset,
3386 				      loff_t len);
3387 
3388 struct ext4_group_info {
3389 	unsigned long   bb_state;
3390 #ifdef AGGRESSIVE_CHECK
3391 	unsigned long	bb_check_counter;
3392 #endif
3393 	struct rb_root  bb_free_root;
3394 	ext4_grpblk_t	bb_first_free;	/* first free block */
3395 	ext4_grpblk_t	bb_free;	/* total free blocks */
3396 	ext4_grpblk_t	bb_fragments;	/* nr of freespace fragments */
3397 	int		bb_avg_fragment_size_order;	/* order of average
3398 							   fragment in BG */
3399 	ext4_grpblk_t	bb_largest_free_order;/* order of largest frag in BG */
3400 	ext4_group_t	bb_group;	/* Group number */
3401 	struct          list_head bb_prealloc_list;
3402 #ifdef DOUBLE_CHECK
3403 	void            *bb_bitmap;
3404 #endif
3405 	struct rw_semaphore alloc_sem;
3406 	struct list_head bb_avg_fragment_size_node;
3407 	struct list_head bb_largest_free_order_node;
3408 	ext4_grpblk_t	bb_counters[];	/* Nr of free power-of-two-block
3409 					 * regions, index is order.
3410 					 * bb_counters[3] = 5 means
3411 					 * 5 free 8-block regions. */
3412 };
3413 
3414 #define EXT4_GROUP_INFO_NEED_INIT_BIT		0
3415 #define EXT4_GROUP_INFO_WAS_TRIMMED_BIT		1
3416 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT	2
3417 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT	3
3418 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT		\
3419 	(1 << EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT)
3420 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT		\
3421 	(1 << EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT)
3422 #define EXT4_GROUP_INFO_BBITMAP_READ_BIT	4
3423 
3424 #define EXT4_MB_GRP_NEED_INIT(grp)	\
3425 	(test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state)))
3426 #define EXT4_MB_GRP_BBITMAP_CORRUPT(grp)	\
3427 	(test_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &((grp)->bb_state)))
3428 #define EXT4_MB_GRP_IBITMAP_CORRUPT(grp)	\
3429 	(test_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &((grp)->bb_state)))
3430 
3431 #define EXT4_MB_GRP_WAS_TRIMMED(grp)	\
3432 	(test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
3433 #define EXT4_MB_GRP_SET_TRIMMED(grp)	\
3434 	(set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
3435 #define EXT4_MB_GRP_CLEAR_TRIMMED(grp)	\
3436 	(clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
3437 #define EXT4_MB_GRP_TEST_AND_SET_READ(grp)	\
3438 	(test_and_set_bit(EXT4_GROUP_INFO_BBITMAP_READ_BIT, &((grp)->bb_state)))
3439 
3440 #define EXT4_MAX_CONTENTION		8
3441 #define EXT4_CONTENTION_THRESHOLD	2
3442 
3443 static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb,
3444 					      ext4_group_t group)
3445 {
3446 	return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group);
3447 }
3448 
3449 /*
3450  * Returns true if the filesystem is busy enough that attempts to
3451  * access the block group locks has run into contention.
3452  */
3453 static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi)
3454 {
3455 	return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD);
3456 }
3457 
3458 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group)
3459 {
3460 	spinlock_t *lock = ext4_group_lock_ptr(sb, group);
3461 	if (spin_trylock(lock))
3462 		/*
3463 		 * We're able to grab the lock right away, so drop the
3464 		 * lock contention counter.
3465 		 */
3466 		atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0);
3467 	else {
3468 		/*
3469 		 * The lock is busy, so bump the contention counter,
3470 		 * and then wait on the spin lock.
3471 		 */
3472 		atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1,
3473 				  EXT4_MAX_CONTENTION);
3474 		spin_lock(lock);
3475 	}
3476 }
3477 
3478 static inline void ext4_unlock_group(struct super_block *sb,
3479 					ext4_group_t group)
3480 {
3481 	spin_unlock(ext4_group_lock_ptr(sb, group));
3482 }
3483 
3484 #ifdef CONFIG_QUOTA
3485 static inline bool ext4_quota_capable(struct super_block *sb)
3486 {
3487 	return (test_opt(sb, QUOTA) || ext4_has_feature_quota(sb));
3488 }
3489 
3490 static inline bool ext4_is_quota_journalled(struct super_block *sb)
3491 {
3492 	struct ext4_sb_info *sbi = EXT4_SB(sb);
3493 
3494 	return (ext4_has_feature_quota(sb) ||
3495 		sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]);
3496 }
3497 int ext4_enable_quotas(struct super_block *sb);
3498 #endif
3499 
3500 /*
3501  * Block validity checking
3502  */
3503 #define ext4_check_indirect_blockref(inode, bh)				\
3504 	ext4_check_blockref(__func__, __LINE__, inode,			\
3505 			    (__le32 *)(bh)->b_data,			\
3506 			    EXT4_ADDR_PER_BLOCK((inode)->i_sb))
3507 
3508 #define ext4_ind_check_inode(inode)					\
3509 	ext4_check_blockref(__func__, __LINE__, inode,			\
3510 			    EXT4_I(inode)->i_data,			\
3511 			    EXT4_NDIR_BLOCKS)
3512 
3513 /*
3514  * Inodes and files operations
3515  */
3516 
3517 /* dir.c */
3518 extern const struct file_operations ext4_dir_operations;
3519 
3520 /* file.c */
3521 extern const struct inode_operations ext4_file_inode_operations;
3522 extern const struct file_operations ext4_file_operations;
3523 extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin);
3524 
3525 /* inline.c */
3526 extern int ext4_get_max_inline_size(struct inode *inode);
3527 extern int ext4_find_inline_data_nolock(struct inode *inode);
3528 extern int ext4_init_inline_data(handle_t *handle, struct inode *inode,
3529 				 unsigned int len);
3530 extern int ext4_destroy_inline_data(handle_t *handle, struct inode *inode);
3531 
3532 int ext4_readpage_inline(struct inode *inode, struct folio *folio);
3533 extern int ext4_try_to_write_inline_data(struct address_space *mapping,
3534 					 struct inode *inode,
3535 					 loff_t pos, unsigned len,
3536 					 struct page **pagep);
3537 int ext4_write_inline_data_end(struct inode *inode, loff_t pos, unsigned len,
3538 			       unsigned copied, struct folio *folio);
3539 extern int ext4_da_write_inline_data_begin(struct address_space *mapping,
3540 					   struct inode *inode,
3541 					   loff_t pos, unsigned len,
3542 					   struct page **pagep,
3543 					   void **fsdata);
3544 extern int ext4_try_add_inline_entry(handle_t *handle,
3545 				     struct ext4_filename *fname,
3546 				     struct inode *dir, struct inode *inode);
3547 extern int ext4_try_create_inline_dir(handle_t *handle,
3548 				      struct inode *parent,
3549 				      struct inode *inode);
3550 extern int ext4_read_inline_dir(struct file *filp,
3551 				struct dir_context *ctx,
3552 				int *has_inline_data);
3553 extern int ext4_inlinedir_to_tree(struct file *dir_file,
3554 				  struct inode *dir, ext4_lblk_t block,
3555 				  struct dx_hash_info *hinfo,
3556 				  __u32 start_hash, __u32 start_minor_hash,
3557 				  int *has_inline_data);
3558 extern struct buffer_head *ext4_find_inline_entry(struct inode *dir,
3559 					struct ext4_filename *fname,
3560 					struct ext4_dir_entry_2 **res_dir,
3561 					int *has_inline_data);
3562 extern int ext4_delete_inline_entry(handle_t *handle,
3563 				    struct inode *dir,
3564 				    struct ext4_dir_entry_2 *de_del,
3565 				    struct buffer_head *bh,
3566 				    int *has_inline_data);
3567 extern bool empty_inline_dir(struct inode *dir, int *has_inline_data);
3568 extern struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
3569 					struct ext4_dir_entry_2 **parent_de,
3570 					int *retval);
3571 extern void *ext4_read_inline_link(struct inode *inode);
3572 
3573 struct iomap;
3574 extern int ext4_inline_data_iomap(struct inode *inode, struct iomap *iomap);
3575 
3576 extern int ext4_inline_data_truncate(struct inode *inode, int *has_inline);
3577 
3578 extern int ext4_convert_inline_data(struct inode *inode);
3579 
3580 static inline int ext4_has_inline_data(struct inode *inode)
3581 {
3582 	return ext4_test_inode_flag(inode, EXT4_INODE_INLINE_DATA) &&
3583 	       EXT4_I(inode)->i_inline_off;
3584 }
3585 
3586 /* namei.c */
3587 extern const struct inode_operations ext4_dir_inode_operations;
3588 extern const struct inode_operations ext4_special_inode_operations;
3589 extern struct dentry *ext4_get_parent(struct dentry *child);
3590 extern struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode,
3591 				 struct ext4_dir_entry_2 *de,
3592 				 int blocksize, int csum_size,
3593 				 unsigned int parent_ino, int dotdot_real_len);
3594 extern void ext4_initialize_dirent_tail(struct buffer_head *bh,
3595 					unsigned int blocksize);
3596 extern int ext4_handle_dirty_dirblock(handle_t *handle, struct inode *inode,
3597 				      struct buffer_head *bh);
3598 extern int __ext4_unlink(struct inode *dir, const struct qstr *d_name,
3599 			 struct inode *inode, struct dentry *dentry);
3600 extern int __ext4_link(struct inode *dir, struct inode *inode,
3601 		       struct dentry *dentry);
3602 
3603 #define S_SHIFT 12
3604 static const unsigned char ext4_type_by_mode[(S_IFMT >> S_SHIFT) + 1] = {
3605 	[S_IFREG >> S_SHIFT]	= EXT4_FT_REG_FILE,
3606 	[S_IFDIR >> S_SHIFT]	= EXT4_FT_DIR,
3607 	[S_IFCHR >> S_SHIFT]	= EXT4_FT_CHRDEV,
3608 	[S_IFBLK >> S_SHIFT]	= EXT4_FT_BLKDEV,
3609 	[S_IFIFO >> S_SHIFT]	= EXT4_FT_FIFO,
3610 	[S_IFSOCK >> S_SHIFT]	= EXT4_FT_SOCK,
3611 	[S_IFLNK >> S_SHIFT]	= EXT4_FT_SYMLINK,
3612 };
3613 
3614 static inline void ext4_set_de_type(struct super_block *sb,
3615 				struct ext4_dir_entry_2 *de,
3616 				umode_t mode) {
3617 	if (ext4_has_feature_filetype(sb))
3618 		de->file_type = ext4_type_by_mode[(mode & S_IFMT)>>S_SHIFT];
3619 }
3620 
3621 /* readpages.c */
3622 extern int ext4_mpage_readpages(struct inode *inode,
3623 		struct readahead_control *rac, struct folio *folio);
3624 extern int __init ext4_init_post_read_processing(void);
3625 extern void ext4_exit_post_read_processing(void);
3626 
3627 /* symlink.c */
3628 extern const struct inode_operations ext4_encrypted_symlink_inode_operations;
3629 extern const struct inode_operations ext4_symlink_inode_operations;
3630 extern const struct inode_operations ext4_fast_symlink_inode_operations;
3631 
3632 /* sysfs.c */
3633 extern void ext4_notify_error_sysfs(struct ext4_sb_info *sbi);
3634 extern int ext4_register_sysfs(struct super_block *sb);
3635 extern void ext4_unregister_sysfs(struct super_block *sb);
3636 extern int __init ext4_init_sysfs(void);
3637 extern void ext4_exit_sysfs(void);
3638 
3639 /* block_validity */
3640 extern void ext4_release_system_zone(struct super_block *sb);
3641 extern int ext4_setup_system_zone(struct super_block *sb);
3642 extern int __init ext4_init_system_zone(void);
3643 extern void ext4_exit_system_zone(void);
3644 extern int ext4_inode_block_valid(struct inode *inode,
3645 				  ext4_fsblk_t start_blk,
3646 				  unsigned int count);
3647 extern int ext4_check_blockref(const char *, unsigned int,
3648 			       struct inode *, __le32 *, unsigned int);
3649 extern int ext4_sb_block_valid(struct super_block *sb, struct inode *inode,
3650 				ext4_fsblk_t start_blk, unsigned int count);
3651 
3652 
3653 /* extents.c */
3654 struct ext4_ext_path;
3655 struct ext4_extent;
3656 
3657 /*
3658  * Maximum number of logical blocks in a file; ext4_extent's ee_block is
3659  * __le32.
3660  */
3661 #define EXT_MAX_BLOCKS	0xffffffff
3662 
3663 extern void ext4_ext_tree_init(handle_t *handle, struct inode *inode);
3664 extern int ext4_ext_index_trans_blocks(struct inode *inode, int extents);
3665 extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
3666 			       struct ext4_map_blocks *map, int flags);
3667 extern int ext4_ext_truncate(handle_t *, struct inode *);
3668 extern int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start,
3669 				 ext4_lblk_t end);
3670 extern void ext4_ext_init(struct super_block *);
3671 extern void ext4_ext_release(struct super_block *);
3672 extern long ext4_fallocate(struct file *file, int mode, loff_t offset,
3673 			  loff_t len);
3674 extern int ext4_convert_unwritten_extents(handle_t *handle, struct inode *inode,
3675 					  loff_t offset, ssize_t len);
3676 extern int ext4_convert_unwritten_io_end_vec(handle_t *handle,
3677 					     ext4_io_end_t *io_end);
3678 extern int ext4_map_blocks(handle_t *handle, struct inode *inode,
3679 			   struct ext4_map_blocks *map, int flags);
3680 extern int ext4_ext_calc_credits_for_single_extent(struct inode *inode,
3681 						   int num,
3682 						   struct ext4_ext_path *path);
3683 extern int ext4_ext_insert_extent(handle_t *, struct inode *,
3684 				  struct ext4_ext_path **,
3685 				  struct ext4_extent *, int);
3686 extern struct ext4_ext_path *ext4_find_extent(struct inode *, ext4_lblk_t,
3687 					      struct ext4_ext_path **,
3688 					      int flags);
3689 extern void ext4_free_ext_path(struct ext4_ext_path *);
3690 extern int ext4_ext_check_inode(struct inode *inode);
3691 extern ext4_lblk_t ext4_ext_next_allocated_block(struct ext4_ext_path *path);
3692 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
3693 			__u64 start, __u64 len);
3694 extern int ext4_get_es_cache(struct inode *inode,
3695 			     struct fiemap_extent_info *fieinfo,
3696 			     __u64 start, __u64 len);
3697 extern int ext4_ext_precache(struct inode *inode);
3698 extern int ext4_swap_extents(handle_t *handle, struct inode *inode1,
3699 				struct inode *inode2, ext4_lblk_t lblk1,
3700 			     ext4_lblk_t lblk2,  ext4_lblk_t count,
3701 			     int mark_unwritten,int *err);
3702 extern int ext4_clu_mapped(struct inode *inode, ext4_lblk_t lclu);
3703 extern int ext4_datasem_ensure_credits(handle_t *handle, struct inode *inode,
3704 				       int check_cred, int restart_cred,
3705 				       int revoke_cred);
3706 extern void ext4_ext_replay_shrink_inode(struct inode *inode, ext4_lblk_t end);
3707 extern int ext4_ext_replay_set_iblocks(struct inode *inode);
3708 extern int ext4_ext_replay_update_ex(struct inode *inode, ext4_lblk_t start,
3709 		int len, int unwritten, ext4_fsblk_t pblk);
3710 extern int ext4_ext_clear_bb(struct inode *inode);
3711 
3712 
3713 /* move_extent.c */
3714 extern void ext4_double_down_write_data_sem(struct inode *first,
3715 					    struct inode *second);
3716 extern void ext4_double_up_write_data_sem(struct inode *orig_inode,
3717 					  struct inode *donor_inode);
3718 extern int ext4_move_extents(struct file *o_filp, struct file *d_filp,
3719 			     __u64 start_orig, __u64 start_donor,
3720 			     __u64 len, __u64 *moved_len);
3721 
3722 /* page-io.c */
3723 extern int __init ext4_init_pageio(void);
3724 extern void ext4_exit_pageio(void);
3725 extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags);
3726 extern ext4_io_end_t *ext4_get_io_end(ext4_io_end_t *io_end);
3727 extern int ext4_put_io_end(ext4_io_end_t *io_end);
3728 extern void ext4_put_io_end_defer(ext4_io_end_t *io_end);
3729 extern void ext4_io_submit_init(struct ext4_io_submit *io,
3730 				struct writeback_control *wbc);
3731 extern void ext4_end_io_rsv_work(struct work_struct *work);
3732 extern void ext4_io_submit(struct ext4_io_submit *io);
3733 int ext4_bio_write_folio(struct ext4_io_submit *io, struct folio *page,
3734 		size_t len);
3735 extern struct ext4_io_end_vec *ext4_alloc_io_end_vec(ext4_io_end_t *io_end);
3736 extern struct ext4_io_end_vec *ext4_last_io_end_vec(ext4_io_end_t *io_end);
3737 
3738 /* mmp.c */
3739 extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t);
3740 
3741 /* mmp.c */
3742 extern void ext4_stop_mmpd(struct ext4_sb_info *sbi);
3743 
3744 /* verity.c */
3745 extern const struct fsverity_operations ext4_verityops;
3746 
3747 /* orphan.c */
3748 extern int ext4_orphan_add(handle_t *, struct inode *);
3749 extern int ext4_orphan_del(handle_t *, struct inode *);
3750 extern void ext4_orphan_cleanup(struct super_block *sb,
3751 				struct ext4_super_block *es);
3752 extern void ext4_release_orphan_info(struct super_block *sb);
3753 extern int ext4_init_orphan_info(struct super_block *sb);
3754 extern int ext4_orphan_file_empty(struct super_block *sb);
3755 extern void ext4_orphan_file_block_trigger(
3756 				struct jbd2_buffer_trigger_type *triggers,
3757 				struct buffer_head *bh,
3758 				void *data, size_t size);
3759 
3760 /*
3761  * Add new method to test whether block and inode bitmaps are properly
3762  * initialized. With uninit_bg reading the block from disk is not enough
3763  * to mark the bitmap uptodate. We need to also zero-out the bitmap
3764  */
3765 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart
3766 
3767 static inline int bitmap_uptodate(struct buffer_head *bh)
3768 {
3769 	return (buffer_uptodate(bh) &&
3770 			test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state));
3771 }
3772 static inline void set_bitmap_uptodate(struct buffer_head *bh)
3773 {
3774 	set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state);
3775 }
3776 
3777 #define in_range(b, first, len)	((b) >= (first) && (b) <= (first) + (len) - 1)
3778 
3779 /* For ioend & aio unwritten conversion wait queues */
3780 #define EXT4_WQ_HASH_SZ		37
3781 #define ext4_ioend_wq(v)   (&ext4__ioend_wq[((unsigned long)(v)) %\
3782 					    EXT4_WQ_HASH_SZ])
3783 extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
3784 
3785 extern int ext4_resize_begin(struct super_block *sb);
3786 extern int ext4_resize_end(struct super_block *sb, bool update_backups);
3787 
3788 static inline void ext4_set_io_unwritten_flag(struct inode *inode,
3789 					      struct ext4_io_end *io_end)
3790 {
3791 	if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) {
3792 		io_end->flag |= EXT4_IO_END_UNWRITTEN;
3793 		atomic_inc(&EXT4_I(inode)->i_unwritten);
3794 	}
3795 }
3796 
3797 static inline void ext4_clear_io_unwritten_flag(ext4_io_end_t *io_end)
3798 {
3799 	struct inode *inode = io_end->inode;
3800 
3801 	if (io_end->flag & EXT4_IO_END_UNWRITTEN) {
3802 		io_end->flag &= ~EXT4_IO_END_UNWRITTEN;
3803 		/* Wake up anyone waiting on unwritten extent conversion */
3804 		if (atomic_dec_and_test(&EXT4_I(inode)->i_unwritten))
3805 			wake_up_all(ext4_ioend_wq(inode));
3806 	}
3807 }
3808 
3809 extern const struct iomap_ops ext4_iomap_ops;
3810 extern const struct iomap_ops ext4_iomap_overwrite_ops;
3811 extern const struct iomap_ops ext4_iomap_report_ops;
3812 
3813 static inline int ext4_buffer_uptodate(struct buffer_head *bh)
3814 {
3815 	/*
3816 	 * If the buffer has the write error flag, we have failed
3817 	 * to write out data in the block.  In this  case, we don't
3818 	 * have to read the block because we may read the old data
3819 	 * successfully.
3820 	 */
3821 	if (buffer_write_io_error(bh))
3822 		set_buffer_uptodate(bh);
3823 	return buffer_uptodate(bh);
3824 }
3825 
3826 #endif	/* __KERNEL__ */
3827 
3828 #define EFSBADCRC	EBADMSG		/* Bad CRC detected */
3829 #define EFSCORRUPTED	EUCLEAN		/* Filesystem is corrupted */
3830 
3831 #endif	/* _EXT4_H */
3832