xref: /linux/fs/ext4/ext4.h (revision 3352633ce6b221d64bf40644d412d9670e7d56e3)
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 /*
180  * Flags used in mballoc's allocation_context flags field.
181  *
182  * Also used to show what's going on for debugging purposes when the
183  * flag field is exported via the traceport interface
184  */
185 
186 /* prefer goal again. length */
187 #define EXT4_MB_HINT_MERGE		0x0001
188 /* blocks already reserved */
189 #define EXT4_MB_HINT_RESERVED		0x0002
190 /* metadata is being allocated */
191 #define EXT4_MB_HINT_METADATA		0x0004
192 /* first blocks in the file */
193 #define EXT4_MB_HINT_FIRST		0x0008
194 /* search for the best chunk */
195 #define EXT4_MB_HINT_BEST		0x0010
196 /* data is being allocated */
197 #define EXT4_MB_HINT_DATA		0x0020
198 /* don't preallocate (for tails) */
199 #define EXT4_MB_HINT_NOPREALLOC		0x0040
200 /* allocate for locality group */
201 #define EXT4_MB_HINT_GROUP_ALLOC	0x0080
202 /* allocate goal blocks or none */
203 #define EXT4_MB_HINT_GOAL_ONLY		0x0100
204 /* goal is meaningful */
205 #define EXT4_MB_HINT_TRY_GOAL		0x0200
206 /* blocks already pre-reserved by delayed allocation */
207 #define EXT4_MB_DELALLOC_RESERVED	0x0400
208 /* We are doing stream allocation */
209 #define EXT4_MB_STREAM_ALLOC		0x0800
210 /* Use reserved root blocks if needed */
211 #define EXT4_MB_USE_ROOT_BLOCKS		0x1000
212 /* Use blocks from reserved pool */
213 #define EXT4_MB_USE_RESERVED		0x2000
214 /* Do strict check for free blocks while retrying block allocation */
215 #define EXT4_MB_STRICT_CHECK		0x4000
216 /* Large fragment size list lookup succeeded at least once for
217  * CR_POWER2_ALIGNED */
218 #define EXT4_MB_CR_POWER2_ALIGNED_OPTIMIZED		0x8000
219 /* Avg fragment size rb tree lookup succeeded at least once for
220  * CR_GOAL_LEN_FAST */
221 #define EXT4_MB_CR_GOAL_LEN_FAST_OPTIMIZED		0x00010000
222 /* Avg fragment size rb tree lookup succeeded at least once for
223  * CR_BEST_AVAIL_LEN */
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_DELAYED	BIT(BH_Delay)
259 #define EXT4_MAP_FLAGS		(EXT4_MAP_NEW | EXT4_MAP_MAPPED |\
260 				 EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY |\
261 				 EXT4_MAP_DELAYED)
262 
263 struct ext4_map_blocks {
264 	ext4_fsblk_t m_pblk;
265 	ext4_lblk_t m_lblk;
266 	unsigned int m_len;
267 	unsigned int m_flags;
268 };
269 
270 /*
271  * Block validity checking, system zone rbtree.
272  */
273 struct ext4_system_blocks {
274 	struct rb_root root;
275 	struct rcu_head rcu;
276 };
277 
278 /*
279  * Flags for ext4_io_end->flags
280  */
281 #define	EXT4_IO_END_UNWRITTEN	0x0001
282 
283 struct ext4_io_end_vec {
284 	struct list_head list;		/* list of io_end_vec */
285 	loff_t offset;			/* offset in the file */
286 	ssize_t size;			/* size of the extent */
287 };
288 
289 /*
290  * For converting unwritten extents on a work queue. 'handle' is used for
291  * buffered writeback.
292  */
293 typedef struct ext4_io_end {
294 	struct list_head	list;		/* per-file finished IO list */
295 	handle_t		*handle;	/* handle reserved for extent
296 						 * conversion */
297 	struct inode		*inode;		/* file being written to */
298 	struct bio		*bio;		/* Linked list of completed
299 						 * bios covering the extent */
300 	unsigned int		flag;		/* unwritten or not */
301 	refcount_t		count;		/* reference counter */
302 	struct list_head	list_vec;	/* list of ext4_io_end_vec */
303 } ext4_io_end_t;
304 
305 struct ext4_io_submit {
306 	struct writeback_control *io_wbc;
307 	struct bio		*io_bio;
308 	ext4_io_end_t		*io_end;
309 	sector_t		io_next_block;
310 };
311 
312 /*
313  * Special inodes numbers
314  */
315 #define	EXT4_BAD_INO		 1	/* Bad blocks inode */
316 #define EXT4_ROOT_INO		 2	/* Root inode */
317 #define EXT4_USR_QUOTA_INO	 3	/* User quota inode */
318 #define EXT4_GRP_QUOTA_INO	 4	/* Group quota inode */
319 #define EXT4_BOOT_LOADER_INO	 5	/* Boot loader inode */
320 #define EXT4_UNDEL_DIR_INO	 6	/* Undelete directory inode */
321 #define EXT4_RESIZE_INO		 7	/* Reserved group descriptors inode */
322 #define EXT4_JOURNAL_INO	 8	/* Journal inode */
323 
324 /* First non-reserved inode for old ext4 filesystems */
325 #define EXT4_GOOD_OLD_FIRST_INO	11
326 
327 /*
328  * Maximal count of links to a file
329  */
330 #define EXT4_LINK_MAX		65000
331 
332 /*
333  * Macro-instructions used to manage several block sizes
334  */
335 #define EXT4_MIN_BLOCK_SIZE		1024
336 #define	EXT4_MAX_BLOCK_SIZE		65536
337 #define EXT4_MIN_BLOCK_LOG_SIZE		10
338 #define EXT4_MAX_BLOCK_LOG_SIZE		16
339 #define EXT4_MAX_CLUSTER_LOG_SIZE	30
340 #ifdef __KERNEL__
341 # define EXT4_BLOCK_SIZE(s)		((s)->s_blocksize)
342 #else
343 # define EXT4_BLOCK_SIZE(s)		(EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
344 #endif
345 #define	EXT4_ADDR_PER_BLOCK(s)		(EXT4_BLOCK_SIZE(s) / sizeof(__u32))
346 #define EXT4_CLUSTER_SIZE(s)		(EXT4_BLOCK_SIZE(s) << \
347 					 EXT4_SB(s)->s_cluster_bits)
348 #ifdef __KERNEL__
349 # define EXT4_BLOCK_SIZE_BITS(s)	((s)->s_blocksize_bits)
350 # define EXT4_CLUSTER_BITS(s)		(EXT4_SB(s)->s_cluster_bits)
351 #else
352 # define EXT4_BLOCK_SIZE_BITS(s)	((s)->s_log_block_size + 10)
353 #endif
354 #ifdef __KERNEL__
355 #define	EXT4_ADDR_PER_BLOCK_BITS(s)	(EXT4_SB(s)->s_addr_per_block_bits)
356 #define EXT4_INODE_SIZE(s)		(EXT4_SB(s)->s_inode_size)
357 #define EXT4_FIRST_INO(s)		(EXT4_SB(s)->s_first_ino)
358 #else
359 #define EXT4_INODE_SIZE(s)	(((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
360 				 EXT4_GOOD_OLD_INODE_SIZE : \
361 				 (s)->s_inode_size)
362 #define EXT4_FIRST_INO(s)	(((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
363 				 EXT4_GOOD_OLD_FIRST_INO : \
364 				 (s)->s_first_ino)
365 #endif
366 #define EXT4_BLOCK_ALIGN(size, blkbits)		ALIGN((size), (1 << (blkbits)))
367 #define EXT4_MAX_BLOCKS(size, offset, blkbits) \
368 	((EXT4_BLOCK_ALIGN(size + offset, blkbits) >> blkbits) - (offset >> \
369 								  blkbits))
370 
371 /* Translate a block number to a cluster number */
372 #define EXT4_B2C(sbi, blk)	((blk) >> (sbi)->s_cluster_bits)
373 /* Translate a cluster number to a block number */
374 #define EXT4_C2B(sbi, cluster)	((cluster) << (sbi)->s_cluster_bits)
375 /* Translate # of blks to # of clusters */
376 #define EXT4_NUM_B2C(sbi, blks)	(((blks) + (sbi)->s_cluster_ratio - 1) >> \
377 				 (sbi)->s_cluster_bits)
378 /* Mask out the low bits to get the starting block of the cluster */
379 #define EXT4_PBLK_CMASK(s, pblk) ((pblk) &				\
380 				  ~((ext4_fsblk_t) (s)->s_cluster_ratio - 1))
381 #define EXT4_LBLK_CMASK(s, lblk) ((lblk) &				\
382 				  ~((ext4_lblk_t) (s)->s_cluster_ratio - 1))
383 /* Fill in the low bits to get the last block of the cluster */
384 #define EXT4_LBLK_CFILL(sbi, lblk) ((lblk) |				\
385 				    ((ext4_lblk_t) (sbi)->s_cluster_ratio - 1))
386 /* Get the cluster offset */
387 #define EXT4_PBLK_COFF(s, pblk) ((pblk) &				\
388 				 ((ext4_fsblk_t) (s)->s_cluster_ratio - 1))
389 #define EXT4_LBLK_COFF(s, lblk) ((lblk) &				\
390 				 ((ext4_lblk_t) (s)->s_cluster_ratio - 1))
391 
392 /*
393  * Structure of a blocks group descriptor
394  */
395 struct ext4_group_desc
396 {
397 	__le32	bg_block_bitmap_lo;	/* Blocks bitmap block */
398 	__le32	bg_inode_bitmap_lo;	/* Inodes bitmap block */
399 	__le32	bg_inode_table_lo;	/* Inodes table block */
400 	__le16	bg_free_blocks_count_lo;/* Free blocks count */
401 	__le16	bg_free_inodes_count_lo;/* Free inodes count */
402 	__le16	bg_used_dirs_count_lo;	/* Directories count */
403 	__le16	bg_flags;		/* EXT4_BG_flags (INODE_UNINIT, etc) */
404 	__le32  bg_exclude_bitmap_lo;   /* Exclude bitmap for snapshots */
405 	__le16  bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bbitmap) LE */
406 	__le16  bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+ibitmap) LE */
407 	__le16  bg_itable_unused_lo;	/* Unused inodes count */
408 	__le16  bg_checksum;		/* crc16(sb_uuid+group+desc) */
409 	__le32	bg_block_bitmap_hi;	/* Blocks bitmap block MSB */
410 	__le32	bg_inode_bitmap_hi;	/* Inodes bitmap block MSB */
411 	__le32	bg_inode_table_hi;	/* Inodes table block MSB */
412 	__le16	bg_free_blocks_count_hi;/* Free blocks count MSB */
413 	__le16	bg_free_inodes_count_hi;/* Free inodes count MSB */
414 	__le16	bg_used_dirs_count_hi;	/* Directories count MSB */
415 	__le16  bg_itable_unused_hi;    /* Unused inodes count MSB */
416 	__le32  bg_exclude_bitmap_hi;   /* Exclude bitmap block MSB */
417 	__le16  bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bbitmap) BE */
418 	__le16  bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+ibitmap) BE */
419 	__u32   bg_reserved;
420 };
421 
422 #define EXT4_BG_INODE_BITMAP_CSUM_HI_END	\
423 	(offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \
424 	 sizeof(__le16))
425 #define EXT4_BG_BLOCK_BITMAP_CSUM_HI_END	\
426 	(offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \
427 	 sizeof(__le16))
428 
429 /*
430  * Structure of a flex block group info
431  */
432 
433 struct flex_groups {
434 	atomic64_t	free_clusters;
435 	atomic_t	free_inodes;
436 	atomic_t	used_dirs;
437 };
438 
439 #define EXT4_BG_INODE_UNINIT	0x0001 /* Inode table/bitmap not in use */
440 #define EXT4_BG_BLOCK_UNINIT	0x0002 /* Block bitmap not in use */
441 #define EXT4_BG_INODE_ZEROED	0x0004 /* On-disk itable initialized to zero */
442 
443 /*
444  * Macro-instructions used to manage group descriptors
445  */
446 #define EXT4_MIN_DESC_SIZE		32
447 #define EXT4_MIN_DESC_SIZE_64BIT	64
448 #define	EXT4_MAX_DESC_SIZE		EXT4_MIN_BLOCK_SIZE
449 #define EXT4_DESC_SIZE(s)		(EXT4_SB(s)->s_desc_size)
450 #ifdef __KERNEL__
451 # define EXT4_BLOCKS_PER_GROUP(s)	(EXT4_SB(s)->s_blocks_per_group)
452 # define EXT4_CLUSTERS_PER_GROUP(s)	(EXT4_SB(s)->s_clusters_per_group)
453 # define EXT4_DESC_PER_BLOCK(s)		(EXT4_SB(s)->s_desc_per_block)
454 # define EXT4_INODES_PER_GROUP(s)	(EXT4_SB(s)->s_inodes_per_group)
455 # define EXT4_DESC_PER_BLOCK_BITS(s)	(EXT4_SB(s)->s_desc_per_block_bits)
456 #else
457 # define EXT4_BLOCKS_PER_GROUP(s)	((s)->s_blocks_per_group)
458 # define EXT4_DESC_PER_BLOCK(s)		(EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
459 # define EXT4_INODES_PER_GROUP(s)	((s)->s_inodes_per_group)
460 #endif
461 
462 /*
463  * Constants relative to the data blocks
464  */
465 #define	EXT4_NDIR_BLOCKS		12
466 #define	EXT4_IND_BLOCK			EXT4_NDIR_BLOCKS
467 #define	EXT4_DIND_BLOCK			(EXT4_IND_BLOCK + 1)
468 #define	EXT4_TIND_BLOCK			(EXT4_DIND_BLOCK + 1)
469 #define	EXT4_N_BLOCKS			(EXT4_TIND_BLOCK + 1)
470 
471 /*
472  * Inode flags
473  */
474 #define	EXT4_SECRM_FL			0x00000001 /* Secure deletion */
475 #define	EXT4_UNRM_FL			0x00000002 /* Undelete */
476 #define	EXT4_COMPR_FL			0x00000004 /* Compress file */
477 #define EXT4_SYNC_FL			0x00000008 /* Synchronous updates */
478 #define EXT4_IMMUTABLE_FL		0x00000010 /* Immutable file */
479 #define EXT4_APPEND_FL			0x00000020 /* writes to file may only append */
480 #define EXT4_NODUMP_FL			0x00000040 /* do not dump file */
481 #define EXT4_NOATIME_FL			0x00000080 /* do not update atime */
482 /* Reserved for compression usage... */
483 #define EXT4_DIRTY_FL			0x00000100
484 #define EXT4_COMPRBLK_FL		0x00000200 /* One or more compressed clusters */
485 #define EXT4_NOCOMPR_FL			0x00000400 /* Don't compress */
486 	/* nb: was previously EXT2_ECOMPR_FL */
487 #define EXT4_ENCRYPT_FL			0x00000800 /* encrypted file */
488 /* End compression flags --- maybe not all used */
489 #define EXT4_INDEX_FL			0x00001000 /* hash-indexed directory */
490 #define EXT4_IMAGIC_FL			0x00002000 /* AFS directory */
491 #define EXT4_JOURNAL_DATA_FL		0x00004000 /* file data should be journaled */
492 #define EXT4_NOTAIL_FL			0x00008000 /* file tail should not be merged */
493 #define EXT4_DIRSYNC_FL			0x00010000 /* dirsync behaviour (directories only) */
494 #define EXT4_TOPDIR_FL			0x00020000 /* Top of directory hierarchies*/
495 #define EXT4_HUGE_FILE_FL               0x00040000 /* Set to each huge file */
496 #define EXT4_EXTENTS_FL			0x00080000 /* Inode uses extents */
497 #define EXT4_VERITY_FL			0x00100000 /* Verity protected inode */
498 #define EXT4_EA_INODE_FL	        0x00200000 /* Inode used for large EA */
499 /* 0x00400000 was formerly EXT4_EOFBLOCKS_FL */
500 
501 #define EXT4_DAX_FL			0x02000000 /* Inode is DAX */
502 
503 #define EXT4_INLINE_DATA_FL		0x10000000 /* Inode has inline data. */
504 #define EXT4_PROJINHERIT_FL		0x20000000 /* Create with parents projid */
505 #define EXT4_CASEFOLD_FL		0x40000000 /* Casefolded directory */
506 #define EXT4_RESERVED_FL		0x80000000 /* reserved for ext4 lib */
507 
508 /* User modifiable flags */
509 #define EXT4_FL_USER_MODIFIABLE		(EXT4_SECRM_FL | \
510 					 EXT4_UNRM_FL | \
511 					 EXT4_COMPR_FL | \
512 					 EXT4_SYNC_FL | \
513 					 EXT4_IMMUTABLE_FL | \
514 					 EXT4_APPEND_FL | \
515 					 EXT4_NODUMP_FL | \
516 					 EXT4_NOATIME_FL | \
517 					 EXT4_JOURNAL_DATA_FL | \
518 					 EXT4_NOTAIL_FL | \
519 					 EXT4_DIRSYNC_FL | \
520 					 EXT4_TOPDIR_FL | \
521 					 EXT4_EXTENTS_FL | \
522 					 0x00400000 /* EXT4_EOFBLOCKS_FL */ | \
523 					 EXT4_DAX_FL | \
524 					 EXT4_PROJINHERIT_FL | \
525 					 EXT4_CASEFOLD_FL)
526 
527 /* User visible flags */
528 #define EXT4_FL_USER_VISIBLE		(EXT4_FL_USER_MODIFIABLE | \
529 					 EXT4_DIRTY_FL | \
530 					 EXT4_COMPRBLK_FL | \
531 					 EXT4_NOCOMPR_FL | \
532 					 EXT4_ENCRYPT_FL | \
533 					 EXT4_INDEX_FL | \
534 					 EXT4_VERITY_FL | \
535 					 EXT4_INLINE_DATA_FL)
536 
537 /* Flags that should be inherited by new inodes from their parent. */
538 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\
539 			   EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\
540 			   EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\
541 			   EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL |\
542 			   EXT4_PROJINHERIT_FL | EXT4_CASEFOLD_FL |\
543 			   EXT4_DAX_FL)
544 
545 /* Flags that are appropriate for regular files (all but dir-specific ones). */
546 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL | EXT4_CASEFOLD_FL |\
547 			   EXT4_PROJINHERIT_FL))
548 
549 /* Flags that are appropriate for non-directories/regular files. */
550 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL)
551 
552 /* The only flags that should be swapped */
553 #define EXT4_FL_SHOULD_SWAP (EXT4_HUGE_FILE_FL | EXT4_EXTENTS_FL)
554 
555 /* Flags which are mutually exclusive to DAX */
556 #define EXT4_DAX_MUT_EXCL (EXT4_VERITY_FL | EXT4_ENCRYPT_FL |\
557 			   EXT4_JOURNAL_DATA_FL | EXT4_INLINE_DATA_FL)
558 
559 /* Mask out flags that are inappropriate for the given type of inode. */
560 static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags)
561 {
562 	if (S_ISDIR(mode))
563 		return flags;
564 	else if (S_ISREG(mode))
565 		return flags & EXT4_REG_FLMASK;
566 	else
567 		return flags & EXT4_OTHER_FLMASK;
568 }
569 
570 /*
571  * Inode flags used for atomic set/get
572  */
573 enum {
574 	EXT4_INODE_SECRM	= 0,	/* Secure deletion */
575 	EXT4_INODE_UNRM		= 1,	/* Undelete */
576 	EXT4_INODE_COMPR	= 2,	/* Compress file */
577 	EXT4_INODE_SYNC		= 3,	/* Synchronous updates */
578 	EXT4_INODE_IMMUTABLE	= 4,	/* Immutable file */
579 	EXT4_INODE_APPEND	= 5,	/* writes to file may only append */
580 	EXT4_INODE_NODUMP	= 6,	/* do not dump file */
581 	EXT4_INODE_NOATIME	= 7,	/* do not update atime */
582 /* Reserved for compression usage... */
583 	EXT4_INODE_DIRTY	= 8,
584 	EXT4_INODE_COMPRBLK	= 9,	/* One or more compressed clusters */
585 	EXT4_INODE_NOCOMPR	= 10,	/* Don't compress */
586 	EXT4_INODE_ENCRYPT	= 11,	/* Encrypted file */
587 /* End compression flags --- maybe not all used */
588 	EXT4_INODE_INDEX	= 12,	/* hash-indexed directory */
589 	EXT4_INODE_IMAGIC	= 13,	/* AFS directory */
590 	EXT4_INODE_JOURNAL_DATA	= 14,	/* file data should be journaled */
591 	EXT4_INODE_NOTAIL	= 15,	/* file tail should not be merged */
592 	EXT4_INODE_DIRSYNC	= 16,	/* dirsync behaviour (directories only) */
593 	EXT4_INODE_TOPDIR	= 17,	/* Top of directory hierarchies*/
594 	EXT4_INODE_HUGE_FILE	= 18,	/* Set to each huge file */
595 	EXT4_INODE_EXTENTS	= 19,	/* Inode uses extents */
596 	EXT4_INODE_VERITY	= 20,	/* Verity protected inode */
597 	EXT4_INODE_EA_INODE	= 21,	/* Inode used for large EA */
598 /* 22 was formerly EXT4_INODE_EOFBLOCKS */
599 	EXT4_INODE_DAX		= 25,	/* Inode is DAX */
600 	EXT4_INODE_INLINE_DATA	= 28,	/* Data in inode. */
601 	EXT4_INODE_PROJINHERIT	= 29,	/* Create with parents projid */
602 	EXT4_INODE_CASEFOLD	= 30,	/* Casefolded directory */
603 	EXT4_INODE_RESERVED	= 31,	/* reserved for ext4 lib */
604 };
605 
606 /*
607  * Since it's pretty easy to mix up bit numbers and hex values, we use a
608  * build-time check to make sure that EXT4_XXX_FL is consistent with respect to
609  * EXT4_INODE_XXX. If all is well, the macros will be dropped, so, it won't cost
610  * any extra space in the compiled kernel image, otherwise, the build will fail.
611  * It's important that these values are the same, since we are using
612  * EXT4_INODE_XXX to test for flag values, but EXT4_XXX_FL must be consistent
613  * with the values of FS_XXX_FL defined in include/linux/fs.h and the on-disk
614  * values found in ext2, ext3 and ext4 filesystems, and of course the values
615  * defined in e2fsprogs.
616  *
617  * It's not paranoia if the Murphy's Law really *is* out to get you.  :-)
618  */
619 #define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1U << EXT4_INODE_##FLAG))
620 #define CHECK_FLAG_VALUE(FLAG) BUILD_BUG_ON(!TEST_FLAG_VALUE(FLAG))
621 
622 static inline void ext4_check_flag_values(void)
623 {
624 	CHECK_FLAG_VALUE(SECRM);
625 	CHECK_FLAG_VALUE(UNRM);
626 	CHECK_FLAG_VALUE(COMPR);
627 	CHECK_FLAG_VALUE(SYNC);
628 	CHECK_FLAG_VALUE(IMMUTABLE);
629 	CHECK_FLAG_VALUE(APPEND);
630 	CHECK_FLAG_VALUE(NODUMP);
631 	CHECK_FLAG_VALUE(NOATIME);
632 	CHECK_FLAG_VALUE(DIRTY);
633 	CHECK_FLAG_VALUE(COMPRBLK);
634 	CHECK_FLAG_VALUE(NOCOMPR);
635 	CHECK_FLAG_VALUE(ENCRYPT);
636 	CHECK_FLAG_VALUE(INDEX);
637 	CHECK_FLAG_VALUE(IMAGIC);
638 	CHECK_FLAG_VALUE(JOURNAL_DATA);
639 	CHECK_FLAG_VALUE(NOTAIL);
640 	CHECK_FLAG_VALUE(DIRSYNC);
641 	CHECK_FLAG_VALUE(TOPDIR);
642 	CHECK_FLAG_VALUE(HUGE_FILE);
643 	CHECK_FLAG_VALUE(EXTENTS);
644 	CHECK_FLAG_VALUE(VERITY);
645 	CHECK_FLAG_VALUE(EA_INODE);
646 	CHECK_FLAG_VALUE(INLINE_DATA);
647 	CHECK_FLAG_VALUE(PROJINHERIT);
648 	CHECK_FLAG_VALUE(CASEFOLD);
649 	CHECK_FLAG_VALUE(RESERVED);
650 }
651 
652 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
653 struct compat_ext4_new_group_input {
654 	u32 group;
655 	compat_u64 block_bitmap;
656 	compat_u64 inode_bitmap;
657 	compat_u64 inode_table;
658 	u32 blocks_count;
659 	u16 reserved_blocks;
660 	u16 unused;
661 };
662 #endif
663 
664 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */
665 struct ext4_new_group_data {
666 	__u32 group;
667 	__u64 block_bitmap;
668 	__u64 inode_bitmap;
669 	__u64 inode_table;
670 	__u32 blocks_count;
671 	__u16 reserved_blocks;
672 	__u16 mdata_blocks;
673 	__u32 free_clusters_count;
674 };
675 
676 /* Indexes used to index group tables in ext4_new_group_data */
677 enum {
678 	BLOCK_BITMAP = 0,	/* block bitmap */
679 	INODE_BITMAP,		/* inode bitmap */
680 	INODE_TABLE,		/* inode tables */
681 	GROUP_TABLE_COUNT,
682 };
683 
684 /*
685  * Flags used by ext4_map_blocks()
686  */
687 	/* Allocate any needed blocks and/or convert an unwritten
688 	   extent to be an initialized ext4 */
689 #define EXT4_GET_BLOCKS_CREATE			0x0001
690 	/* Request the creation of an unwritten extent */
691 #define EXT4_GET_BLOCKS_UNWRIT_EXT		0x0002
692 #define EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT	(EXT4_GET_BLOCKS_UNWRIT_EXT|\
693 						 EXT4_GET_BLOCKS_CREATE)
694 	/* Caller is from the delayed allocation writeout path
695 	 * finally doing the actual allocation of delayed blocks */
696 #define EXT4_GET_BLOCKS_DELALLOC_RESERVE	0x0004
697 	/* caller is from the direct IO path, request to creation of an
698 	unwritten extents if not allocated, split the unwritten
699 	extent if blocks has been preallocated already*/
700 #define EXT4_GET_BLOCKS_PRE_IO			0x0008
701 #define EXT4_GET_BLOCKS_CONVERT			0x0010
702 #define EXT4_GET_BLOCKS_IO_CREATE_EXT		(EXT4_GET_BLOCKS_PRE_IO|\
703 					 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT)
704 	/* Convert extent to initialized after IO complete */
705 #define EXT4_GET_BLOCKS_IO_CONVERT_EXT		(EXT4_GET_BLOCKS_CONVERT|\
706 					 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT)
707 	/* Eventual metadata allocation (due to growing extent tree)
708 	 * should not fail, so try to use reserved blocks for that.*/
709 #define EXT4_GET_BLOCKS_METADATA_NOFAIL		0x0020
710 	/* Don't normalize allocation size (used for fallocate) */
711 #define EXT4_GET_BLOCKS_NO_NORMALIZE		0x0040
712 	/* Convert written extents to unwritten */
713 #define EXT4_GET_BLOCKS_CONVERT_UNWRITTEN	0x0100
714 	/* Write zeros to newly created written extents */
715 #define EXT4_GET_BLOCKS_ZERO			0x0200
716 #define EXT4_GET_BLOCKS_CREATE_ZERO		(EXT4_GET_BLOCKS_CREATE |\
717 					EXT4_GET_BLOCKS_ZERO)
718 	/* Caller will submit data before dropping transaction handle. This
719 	 * allows jbd2 to avoid submitting data before commit. */
720 #define EXT4_GET_BLOCKS_IO_SUBMIT		0x0400
721 	/* Caller is in the atomic contex, find extent if it has been cached */
722 #define EXT4_GET_BLOCKS_CACHED_NOWAIT		0x0800
723 
724 /*
725  * The bit position of these flags must not overlap with any of the
726  * EXT4_GET_BLOCKS_*.  They are used by ext4_find_extent(),
727  * read_extent_tree_block(), ext4_split_extent_at(),
728  * ext4_ext_insert_extent(), and ext4_ext_create_new_leaf().
729  * EXT4_EX_NOCACHE is used to indicate that the we shouldn't be
730  * caching the extents when reading from the extent tree while a
731  * truncate or punch hole operation is in progress.
732  */
733 #define EXT4_EX_NOCACHE				0x40000000
734 #define EXT4_EX_FORCE_CACHE			0x20000000
735 #define EXT4_EX_NOFAIL				0x10000000
736 
737 /*
738  * Flags used by ext4_free_blocks
739  */
740 #define EXT4_FREE_BLOCKS_METADATA		0x0001
741 #define EXT4_FREE_BLOCKS_FORGET			0x0002
742 #define EXT4_FREE_BLOCKS_VALIDATED		0x0004
743 #define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE		0x0008
744 #define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER	0x0010
745 #define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER	0x0020
746 #define EXT4_FREE_BLOCKS_RERESERVE_CLUSTER      0x0040
747 
748 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
749 /*
750  * ioctl commands in 32 bit emulation
751  */
752 #define EXT4_IOC32_GETVERSION		_IOR('f', 3, int)
753 #define EXT4_IOC32_SETVERSION		_IOW('f', 4, int)
754 #define EXT4_IOC32_GETRSVSZ		_IOR('f', 5, int)
755 #define EXT4_IOC32_SETRSVSZ		_IOW('f', 6, int)
756 #define EXT4_IOC32_GROUP_EXTEND		_IOW('f', 7, unsigned int)
757 #define EXT4_IOC32_GROUP_ADD		_IOW('f', 8, struct compat_ext4_new_group_input)
758 #define EXT4_IOC32_GETVERSION_OLD	FS_IOC32_GETVERSION
759 #define EXT4_IOC32_SETVERSION_OLD	FS_IOC32_SETVERSION
760 #endif
761 
762 /* Max physical block we can address w/o extents */
763 #define EXT4_MAX_BLOCK_FILE_PHYS	0xFFFFFFFF
764 
765 /* Max logical block we can support */
766 #define EXT4_MAX_LOGICAL_BLOCK		0xFFFFFFFE
767 
768 /*
769  * Structure of an inode on the disk
770  */
771 struct ext4_inode {
772 	__le16	i_mode;		/* File mode */
773 	__le16	i_uid;		/* Low 16 bits of Owner Uid */
774 	__le32	i_size_lo;	/* Size in bytes */
775 	__le32	i_atime;	/* Access time */
776 	__le32	i_ctime;	/* Inode Change time */
777 	__le32	i_mtime;	/* Modification time */
778 	__le32	i_dtime;	/* Deletion Time */
779 	__le16	i_gid;		/* Low 16 bits of Group Id */
780 	__le16	i_links_count;	/* Links count */
781 	__le32	i_blocks_lo;	/* Blocks count */
782 	__le32	i_flags;	/* File flags */
783 	union {
784 		struct {
785 			__le32  l_i_version;
786 		} linux1;
787 		struct {
788 			__u32  h_i_translator;
789 		} hurd1;
790 		struct {
791 			__u32  m_i_reserved1;
792 		} masix1;
793 	} osd1;				/* OS dependent 1 */
794 	__le32	i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
795 	__le32	i_generation;	/* File version (for NFS) */
796 	__le32	i_file_acl_lo;	/* File ACL */
797 	__le32	i_size_high;
798 	__le32	i_obso_faddr;	/* Obsoleted fragment address */
799 	union {
800 		struct {
801 			__le16	l_i_blocks_high; /* were l_i_reserved1 */
802 			__le16	l_i_file_acl_high;
803 			__le16	l_i_uid_high;	/* these 2 fields */
804 			__le16	l_i_gid_high;	/* were reserved2[0] */
805 			__le16	l_i_checksum_lo;/* crc32c(uuid+inum+inode) LE */
806 			__le16	l_i_reserved;
807 		} linux2;
808 		struct {
809 			__le16	h_i_reserved1;	/* Obsoleted fragment number/size which are removed in ext4 */
810 			__u16	h_i_mode_high;
811 			__u16	h_i_uid_high;
812 			__u16	h_i_gid_high;
813 			__u32	h_i_author;
814 		} hurd2;
815 		struct {
816 			__le16	h_i_reserved1;	/* Obsoleted fragment number/size which are removed in ext4 */
817 			__le16	m_i_file_acl_high;
818 			__u32	m_i_reserved2[2];
819 		} masix2;
820 	} osd2;				/* OS dependent 2 */
821 	__le16	i_extra_isize;
822 	__le16	i_checksum_hi;	/* crc32c(uuid+inum+inode) BE */
823 	__le32  i_ctime_extra;  /* extra Change time      (nsec << 2 | epoch) */
824 	__le32  i_mtime_extra;  /* extra Modification time(nsec << 2 | epoch) */
825 	__le32  i_atime_extra;  /* extra Access time      (nsec << 2 | epoch) */
826 	__le32  i_crtime;       /* File Creation time */
827 	__le32  i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */
828 	__le32  i_version_hi;	/* high 32 bits for 64-bit version */
829 	__le32	i_projid;	/* Project ID */
830 };
831 
832 #define EXT4_EPOCH_BITS 2
833 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
834 #define EXT4_NSEC_MASK  (~0UL << EXT4_EPOCH_BITS)
835 
836 /*
837  * Extended fields will fit into an inode if the filesystem was formatted
838  * with large inodes (-I 256 or larger) and there are not currently any EAs
839  * consuming all of the available space. For new inodes we always reserve
840  * enough space for the kernel's known extended fields, but for inodes
841  * created with an old kernel this might not have been the case. None of
842  * the extended inode fields is critical for correct filesystem operation.
843  * This macro checks if a certain field fits in the inode. Note that
844  * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
845  */
846 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field)	\
847 	((offsetof(typeof(*ext4_inode), field) +	\
848 	  sizeof((ext4_inode)->field))			\
849 	<= (EXT4_GOOD_OLD_INODE_SIZE +			\
850 	    (einode)->i_extra_isize))			\
851 
852 /*
853  * We use an encoding that preserves the times for extra epoch "00":
854  *
855  * extra  msb of                         adjust for signed
856  * epoch  32-bit                         32-bit tv_sec to
857  * bits   time    decoded 64-bit tv_sec  64-bit tv_sec      valid time range
858  * 0 0    1    -0x80000000..-0x00000001  0x000000000 1901-12-13..1969-12-31
859  * 0 0    0    0x000000000..0x07fffffff  0x000000000 1970-01-01..2038-01-19
860  * 0 1    1    0x080000000..0x0ffffffff  0x100000000 2038-01-19..2106-02-07
861  * 0 1    0    0x100000000..0x17fffffff  0x100000000 2106-02-07..2174-02-25
862  * 1 0    1    0x180000000..0x1ffffffff  0x200000000 2174-02-25..2242-03-16
863  * 1 0    0    0x200000000..0x27fffffff  0x200000000 2242-03-16..2310-04-04
864  * 1 1    1    0x280000000..0x2ffffffff  0x300000000 2310-04-04..2378-04-22
865  * 1 1    0    0x300000000..0x37fffffff  0x300000000 2378-04-22..2446-05-10
866  *
867  * Note that previous versions of the kernel on 64-bit systems would
868  * incorrectly use extra epoch bits 1,1 for dates between 1901 and
869  * 1970.  e2fsck will correct this, assuming that it is run on the
870  * affected filesystem before 2242.
871  */
872 
873 static inline __le32 ext4_encode_extra_time(struct timespec64 ts)
874 {
875 	u32 extra = ((ts.tv_sec - (s32)ts.tv_sec) >> 32) & EXT4_EPOCH_MASK;
876 	return cpu_to_le32(extra | (ts.tv_nsec << EXT4_EPOCH_BITS));
877 }
878 
879 static inline struct timespec64 ext4_decode_extra_time(__le32 base,
880 						       __le32 extra)
881 {
882 	struct timespec64 ts = { .tv_sec = (signed)le32_to_cpu(base) };
883 
884 	if (unlikely(extra & cpu_to_le32(EXT4_EPOCH_MASK)))
885 		ts.tv_sec += (u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) << 32;
886 	ts.tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS;
887 	return ts;
888 }
889 
890 #define EXT4_INODE_SET_XTIME_VAL(xtime, inode, raw_inode, ts)			\
891 do {										\
892 	if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) {	\
893 		(raw_inode)->xtime = cpu_to_le32((ts).tv_sec);			\
894 		(raw_inode)->xtime ## _extra = ext4_encode_extra_time(ts);	\
895 	} else									\
896 		(raw_inode)->xtime = cpu_to_le32(clamp_t(int32_t, (ts).tv_sec, S32_MIN, S32_MAX));	\
897 } while (0)
898 
899 #define EXT4_INODE_SET_ATIME(inode, raw_inode)						\
900 	EXT4_INODE_SET_XTIME_VAL(i_atime, inode, raw_inode, inode_get_atime(inode))
901 
902 #define EXT4_INODE_SET_MTIME(inode, raw_inode)						\
903 	EXT4_INODE_SET_XTIME_VAL(i_mtime, inode, raw_inode, inode_get_mtime(inode))
904 
905 #define EXT4_INODE_SET_CTIME(inode, raw_inode)						\
906 	EXT4_INODE_SET_XTIME_VAL(i_ctime, inode, raw_inode, inode_get_ctime(inode))
907 
908 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode)				\
909 	if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime))			\
910 		EXT4_INODE_SET_XTIME_VAL(xtime, &((einode)->vfs_inode),		\
911 					 raw_inode, (einode)->xtime)
912 
913 #define EXT4_INODE_GET_XTIME_VAL(xtime, inode, raw_inode)			\
914 	(EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra) ?	\
915 		ext4_decode_extra_time((raw_inode)->xtime,				\
916 				       (raw_inode)->xtime ## _extra) :		\
917 		(struct timespec64) {						\
918 			.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime)	\
919 		})
920 
921 #define EXT4_INODE_GET_ATIME(inode, raw_inode)					\
922 do {										\
923 	inode_set_atime_to_ts(inode,						\
924 		EXT4_INODE_GET_XTIME_VAL(i_atime, inode, raw_inode));		\
925 } while (0)
926 
927 #define EXT4_INODE_GET_MTIME(inode, raw_inode)					\
928 do {										\
929 	inode_set_mtime_to_ts(inode,						\
930 		EXT4_INODE_GET_XTIME_VAL(i_mtime, inode, raw_inode));		\
931 } while (0)
932 
933 #define EXT4_INODE_GET_CTIME(inode, raw_inode)					\
934 do {										\
935 	inode_set_ctime_to_ts(inode,						\
936 		EXT4_INODE_GET_XTIME_VAL(i_ctime, inode, raw_inode));		\
937 } while (0)
938 
939 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode)				\
940 do {										\
941 	if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) 			\
942 		(einode)->xtime =						\
943 			EXT4_INODE_GET_XTIME_VAL(xtime, &(einode->vfs_inode),	\
944 						 raw_inode);			\
945 	else									\
946 		(einode)->xtime = (struct timespec64){0, 0};			\
947 } while (0)
948 
949 #define i_disk_version osd1.linux1.l_i_version
950 
951 #if defined(__KERNEL__) || defined(__linux__)
952 #define i_reserved1	osd1.linux1.l_i_reserved1
953 #define i_file_acl_high	osd2.linux2.l_i_file_acl_high
954 #define i_blocks_high	osd2.linux2.l_i_blocks_high
955 #define i_uid_low	i_uid
956 #define i_gid_low	i_gid
957 #define i_uid_high	osd2.linux2.l_i_uid_high
958 #define i_gid_high	osd2.linux2.l_i_gid_high
959 #define i_checksum_lo	osd2.linux2.l_i_checksum_lo
960 
961 #elif defined(__GNU__)
962 
963 #define i_translator	osd1.hurd1.h_i_translator
964 #define i_uid_high	osd2.hurd2.h_i_uid_high
965 #define i_gid_high	osd2.hurd2.h_i_gid_high
966 #define i_author	osd2.hurd2.h_i_author
967 
968 #elif defined(__masix__)
969 
970 #define i_reserved1	osd1.masix1.m_i_reserved1
971 #define i_file_acl_high	osd2.masix2.m_i_file_acl_high
972 #define i_reserved2	osd2.masix2.m_i_reserved2
973 
974 #endif /* defined(__KERNEL__) || defined(__linux__) */
975 
976 #include "extents_status.h"
977 #include "fast_commit.h"
978 
979 /*
980  * Lock subclasses for i_data_sem in the ext4_inode_info structure.
981  *
982  * These are needed to avoid lockdep false positives when we need to
983  * allocate blocks to the quota inode during ext4_map_blocks(), while
984  * holding i_data_sem for a normal (non-quota) inode.  Since we don't
985  * do quota tracking for the quota inode, this avoids deadlock (as
986  * well as infinite recursion, since it isn't turtles all the way
987  * down...)
988  *
989  *  I_DATA_SEM_NORMAL - Used for most inodes
990  *  I_DATA_SEM_OTHER  - Used by move_inode.c for the second normal inode
991  *			  where the second inode has larger inode number
992  *			  than the first
993  *  I_DATA_SEM_QUOTA  - Used for quota inodes only
994  *  I_DATA_SEM_EA     - Used for ea_inodes only
995  */
996 enum {
997 	I_DATA_SEM_NORMAL = 0,
998 	I_DATA_SEM_OTHER,
999 	I_DATA_SEM_QUOTA,
1000 	I_DATA_SEM_EA
1001 };
1002 
1003 
1004 /*
1005  * fourth extended file system inode data in memory
1006  */
1007 struct ext4_inode_info {
1008 	__le32	i_data[15];	/* unconverted */
1009 	__u32	i_dtime;
1010 	ext4_fsblk_t	i_file_acl;
1011 
1012 	/*
1013 	 * i_block_group is the number of the block group which contains
1014 	 * this file's inode.  Constant across the lifetime of the inode,
1015 	 * it is used for making block allocation decisions - we try to
1016 	 * place a file's data blocks near its inode block, and new inodes
1017 	 * near to their parent directory's inode.
1018 	 */
1019 	ext4_group_t	i_block_group;
1020 	ext4_lblk_t	i_dir_start_lookup;
1021 #if (BITS_PER_LONG < 64)
1022 	unsigned long	i_state_flags;		/* Dynamic state flags */
1023 #endif
1024 	unsigned long	i_flags;
1025 
1026 	/*
1027 	 * Extended attributes can be read independently of the main file
1028 	 * data. Taking i_rwsem even when reading would cause contention
1029 	 * between readers of EAs and writers of regular file data, so
1030 	 * instead we synchronize on xattr_sem when reading or changing
1031 	 * EAs.
1032 	 */
1033 	struct rw_semaphore xattr_sem;
1034 
1035 	/*
1036 	 * Inodes with EXT4_STATE_ORPHAN_FILE use i_orphan_idx. Otherwise
1037 	 * i_orphan is used.
1038 	 */
1039 	union {
1040 		struct list_head i_orphan;	/* unlinked but open inodes */
1041 		unsigned int i_orphan_idx;	/* Index in orphan file */
1042 	};
1043 
1044 	/* Fast commit related info */
1045 
1046 	/* For tracking dentry create updates */
1047 	struct list_head i_fc_dilist;
1048 	struct list_head i_fc_list;	/*
1049 					 * inodes that need fast commit
1050 					 * protected by sbi->s_fc_lock.
1051 					 */
1052 
1053 	/* Start of lblk range that needs to be committed in this fast commit */
1054 	ext4_lblk_t i_fc_lblk_start;
1055 
1056 	/* End of lblk range that needs to be committed in this fast commit */
1057 	ext4_lblk_t i_fc_lblk_len;
1058 
1059 	/* Number of ongoing updates on this inode */
1060 	atomic_t  i_fc_updates;
1061 
1062 	/* Fast commit wait queue for this inode */
1063 	wait_queue_head_t i_fc_wait;
1064 
1065 	/* Protect concurrent accesses on i_fc_lblk_start, i_fc_lblk_len */
1066 	struct mutex i_fc_lock;
1067 
1068 	/*
1069 	 * i_disksize keeps track of what the inode size is ON DISK, not
1070 	 * in memory.  During truncate, i_size is set to the new size by
1071 	 * the VFS prior to calling ext4_truncate(), but the filesystem won't
1072 	 * set i_disksize to 0 until the truncate is actually under way.
1073 	 *
1074 	 * The intent is that i_disksize always represents the blocks which
1075 	 * are used by this file.  This allows recovery to restart truncate
1076 	 * on orphans if we crash during truncate.  We actually write i_disksize
1077 	 * into the on-disk inode when writing inodes out, instead of i_size.
1078 	 *
1079 	 * The only time when i_disksize and i_size may be different is when
1080 	 * a truncate is in progress.  The only things which change i_disksize
1081 	 * are ext4_get_block (growth) and ext4_truncate (shrinkth).
1082 	 */
1083 	loff_t	i_disksize;
1084 
1085 	/*
1086 	 * i_data_sem is for serialising ext4_truncate() against
1087 	 * ext4_getblock().  In the 2.4 ext2 design, great chunks of inode's
1088 	 * data tree are chopped off during truncate. We can't do that in
1089 	 * ext4 because whenever we perform intermediate commits during
1090 	 * truncate, the inode and all the metadata blocks *must* be in a
1091 	 * consistent state which allows truncation of the orphans to restart
1092 	 * during recovery.  Hence we must fix the get_block-vs-truncate race
1093 	 * by other means, so we have i_data_sem.
1094 	 */
1095 	struct rw_semaphore i_data_sem;
1096 	struct inode vfs_inode;
1097 	struct jbd2_inode *jinode;
1098 
1099 	spinlock_t i_raw_lock;	/* protects updates to the raw inode */
1100 
1101 	/*
1102 	 * File creation time. Its function is same as that of
1103 	 * struct timespec64 i_{a,c,m}time in the generic inode.
1104 	 */
1105 	struct timespec64 i_crtime;
1106 
1107 	/* mballoc */
1108 	atomic_t i_prealloc_active;
1109 	struct rb_root i_prealloc_node;
1110 	rwlock_t i_prealloc_lock;
1111 
1112 	/* extents status tree */
1113 	struct ext4_es_tree i_es_tree;
1114 	rwlock_t i_es_lock;
1115 	struct list_head i_es_list;
1116 	unsigned int i_es_all_nr;	/* protected by i_es_lock */
1117 	unsigned int i_es_shk_nr;	/* protected by i_es_lock */
1118 	ext4_lblk_t i_es_shrink_lblk;	/* Offset where we start searching for
1119 					   extents to shrink. Protected by
1120 					   i_es_lock  */
1121 
1122 	/* ialloc */
1123 	ext4_group_t	i_last_alloc_group;
1124 
1125 	/* allocation reservation info for delalloc */
1126 	/* In case of bigalloc, this refer to clusters rather than blocks */
1127 	unsigned int i_reserved_data_blocks;
1128 
1129 	/* pending cluster reservations for bigalloc file systems */
1130 	struct ext4_pending_tree i_pending_tree;
1131 
1132 	/* on-disk additional length */
1133 	__u16 i_extra_isize;
1134 
1135 	/* Indicate the inline data space. */
1136 	u16 i_inline_off;
1137 	u16 i_inline_size;
1138 
1139 #ifdef CONFIG_QUOTA
1140 	/* quota space reservation, managed internally by quota code */
1141 	qsize_t i_reserved_quota;
1142 #endif
1143 
1144 	/* Lock protecting lists below */
1145 	spinlock_t i_completed_io_lock;
1146 	/*
1147 	 * Completed IOs that need unwritten extents handling and have
1148 	 * transaction reserved
1149 	 */
1150 	struct list_head i_rsv_conversion_list;
1151 	struct work_struct i_rsv_conversion_work;
1152 	atomic_t i_unwritten; /* Nr. of inflight conversions pending */
1153 
1154 	spinlock_t i_block_reservation_lock;
1155 
1156 	/*
1157 	 * Transactions that contain inode's metadata needed to complete
1158 	 * fsync and fdatasync, respectively.
1159 	 */
1160 	tid_t i_sync_tid;
1161 	tid_t i_datasync_tid;
1162 
1163 #ifdef CONFIG_QUOTA
1164 	struct dquot __rcu *i_dquot[MAXQUOTAS];
1165 #endif
1166 
1167 	/* Precomputed uuid+inum+igen checksum for seeding inode checksums */
1168 	__u32 i_csum_seed;
1169 
1170 	kprojid_t i_projid;
1171 };
1172 
1173 /*
1174  * File system states
1175  */
1176 #define	EXT4_VALID_FS			0x0001	/* Unmounted cleanly */
1177 #define	EXT4_ERROR_FS			0x0002	/* Errors detected */
1178 #define	EXT4_ORPHAN_FS			0x0004	/* Orphans being recovered */
1179 #define EXT4_FC_REPLAY			0x0020	/* Fast commit replay ongoing */
1180 
1181 /*
1182  * Misc. filesystem flags
1183  */
1184 #define EXT2_FLAGS_SIGNED_HASH		0x0001  /* Signed dirhash in use */
1185 #define EXT2_FLAGS_UNSIGNED_HASH	0x0002  /* Unsigned dirhash in use */
1186 #define EXT2_FLAGS_TEST_FILESYS		0x0004	/* to test development code */
1187 
1188 /*
1189  * Mount flags set via mount options or defaults
1190  */
1191 #define EXT4_MOUNT_NO_MBCACHE		0x00001 /* Do not use mbcache */
1192 #define EXT4_MOUNT_GRPID		0x00004	/* Create files with directory's group */
1193 #define EXT4_MOUNT_DEBUG		0x00008	/* Some debugging messages */
1194 #define EXT4_MOUNT_ERRORS_CONT		0x00010	/* Continue on errors */
1195 #define EXT4_MOUNT_ERRORS_RO		0x00020	/* Remount fs ro on errors */
1196 #define EXT4_MOUNT_ERRORS_PANIC		0x00040	/* Panic on errors */
1197 #define EXT4_MOUNT_ERRORS_MASK		0x00070
1198 #define EXT4_MOUNT_MINIX_DF		0x00080	/* Mimics the Minix statfs */
1199 #define EXT4_MOUNT_NOLOAD		0x00100	/* Don't use existing journal*/
1200 #ifdef CONFIG_FS_DAX
1201 #define EXT4_MOUNT_DAX_ALWAYS		0x00200	/* Direct Access */
1202 #else
1203 #define EXT4_MOUNT_DAX_ALWAYS		0
1204 #endif
1205 #define EXT4_MOUNT_DATA_FLAGS		0x00C00	/* Mode for data writes: */
1206 #define EXT4_MOUNT_JOURNAL_DATA		0x00400	/* Write data to journal */
1207 #define EXT4_MOUNT_ORDERED_DATA		0x00800	/* Flush data before commit */
1208 #define EXT4_MOUNT_WRITEBACK_DATA	0x00C00	/* No data ordering */
1209 #define EXT4_MOUNT_UPDATE_JOURNAL	0x01000	/* Update the journal format */
1210 #define EXT4_MOUNT_NO_UID32		0x02000  /* Disable 32-bit UIDs */
1211 #define EXT4_MOUNT_XATTR_USER		0x04000	/* Extended user attributes */
1212 #define EXT4_MOUNT_POSIX_ACL		0x08000	/* POSIX Access Control Lists */
1213 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC	0x10000	/* No auto delalloc mapping */
1214 #define EXT4_MOUNT_BARRIER		0x20000 /* Use block barriers */
1215 #define EXT4_MOUNT_QUOTA		0x40000 /* Some quota option set */
1216 #define EXT4_MOUNT_USRQUOTA		0x80000 /* "old" user quota,
1217 						 * enable enforcement for hidden
1218 						 * quota files */
1219 #define EXT4_MOUNT_GRPQUOTA		0x100000 /* "old" group quota, enable
1220 						  * enforcement for hidden quota
1221 						  * files */
1222 #define EXT4_MOUNT_PRJQUOTA		0x200000 /* Enable project quota
1223 						  * enforcement */
1224 #define EXT4_MOUNT_DIOREAD_NOLOCK	0x400000 /* Enable support for dio read nolocking */
1225 #define EXT4_MOUNT_JOURNAL_CHECKSUM	0x800000 /* Journal checksums */
1226 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT	0x1000000 /* Journal Async Commit */
1227 #define EXT4_MOUNT_WARN_ON_ERROR	0x2000000 /* Trigger WARN_ON on error */
1228 #define EXT4_MOUNT_NO_PREFETCH_BLOCK_BITMAPS 0x4000000
1229 #define EXT4_MOUNT_DELALLOC		0x8000000 /* Delalloc support */
1230 #define EXT4_MOUNT_DATA_ERR_ABORT	0x10000000 /* Abort on file data write */
1231 #define EXT4_MOUNT_BLOCK_VALIDITY	0x20000000 /* Block validity checking */
1232 #define EXT4_MOUNT_DISCARD		0x40000000 /* Issue DISCARD requests */
1233 #define EXT4_MOUNT_INIT_INODE_TABLE	0x80000000 /* Initialize uninitialized itables */
1234 
1235 /*
1236  * Mount flags set either automatically (could not be set by mount option)
1237  * based on per file system feature or property or in special cases such as
1238  * distinguishing between explicit mount option definition and default.
1239  */
1240 #define EXT4_MOUNT2_EXPLICIT_DELALLOC	0x00000001 /* User explicitly
1241 						      specified delalloc */
1242 #define EXT4_MOUNT2_STD_GROUP_SIZE	0x00000002 /* We have standard group
1243 						      size of blocksize * 8
1244 						      blocks */
1245 #define EXT4_MOUNT2_HURD_COMPAT		0x00000004 /* Support HURD-castrated
1246 						      file systems */
1247 #define EXT4_MOUNT2_EXPLICIT_JOURNAL_CHECKSUM	0x00000008 /* User explicitly
1248 						specified journal checksum */
1249 
1250 #define EXT4_MOUNT2_JOURNAL_FAST_COMMIT	0x00000010 /* Journal fast commit */
1251 #define EXT4_MOUNT2_DAX_NEVER		0x00000020 /* Do not allow Direct Access */
1252 #define EXT4_MOUNT2_DAX_INODE		0x00000040 /* For printing options only */
1253 #define EXT4_MOUNT2_MB_OPTIMIZE_SCAN	0x00000080 /* Optimize group
1254 						    * scanning in mballoc
1255 						    */
1256 #define EXT4_MOUNT2_ABORT		0x00000100 /* Abort filesystem */
1257 
1258 #define clear_opt(sb, opt)		EXT4_SB(sb)->s_mount_opt &= \
1259 						~EXT4_MOUNT_##opt
1260 #define set_opt(sb, opt)		EXT4_SB(sb)->s_mount_opt |= \
1261 						EXT4_MOUNT_##opt
1262 #define test_opt(sb, opt)		(EXT4_SB(sb)->s_mount_opt & \
1263 					 EXT4_MOUNT_##opt)
1264 
1265 #define clear_opt2(sb, opt)		EXT4_SB(sb)->s_mount_opt2 &= \
1266 						~EXT4_MOUNT2_##opt
1267 #define set_opt2(sb, opt)		EXT4_SB(sb)->s_mount_opt2 |= \
1268 						EXT4_MOUNT2_##opt
1269 #define test_opt2(sb, opt)		(EXT4_SB(sb)->s_mount_opt2 & \
1270 					 EXT4_MOUNT2_##opt)
1271 
1272 #define ext4_test_and_set_bit		__test_and_set_bit_le
1273 #define ext4_set_bit			__set_bit_le
1274 #define ext4_test_and_clear_bit		__test_and_clear_bit_le
1275 #define ext4_clear_bit			__clear_bit_le
1276 #define ext4_test_bit			test_bit_le
1277 #define ext4_find_next_zero_bit		find_next_zero_bit_le
1278 #define ext4_find_next_bit		find_next_bit_le
1279 
1280 extern void mb_set_bits(void *bm, int cur, int len);
1281 
1282 /*
1283  * Maximal mount counts between two filesystem checks
1284  */
1285 #define EXT4_DFL_MAX_MNT_COUNT		20	/* Allow 20 mounts */
1286 #define EXT4_DFL_CHECKINTERVAL		0	/* Don't use interval check */
1287 
1288 /*
1289  * Behaviour when detecting errors
1290  */
1291 #define EXT4_ERRORS_CONTINUE		1	/* Continue execution */
1292 #define EXT4_ERRORS_RO			2	/* Remount fs read-only */
1293 #define EXT4_ERRORS_PANIC		3	/* Panic */
1294 #define EXT4_ERRORS_DEFAULT		EXT4_ERRORS_CONTINUE
1295 
1296 /* Metadata checksum algorithm codes */
1297 #define EXT4_CRC32C_CHKSUM		1
1298 
1299 #define EXT4_LABEL_MAX			16
1300 
1301 /*
1302  * Structure of the super block
1303  */
1304 struct ext4_super_block {
1305 /*00*/	__le32	s_inodes_count;		/* Inodes count */
1306 	__le32	s_blocks_count_lo;	/* Blocks count */
1307 	__le32	s_r_blocks_count_lo;	/* Reserved blocks count */
1308 	__le32	s_free_blocks_count_lo;	/* Free blocks count */
1309 /*10*/	__le32	s_free_inodes_count;	/* Free inodes count */
1310 	__le32	s_first_data_block;	/* First Data Block */
1311 	__le32	s_log_block_size;	/* Block size */
1312 	__le32	s_log_cluster_size;	/* Allocation cluster size */
1313 /*20*/	__le32	s_blocks_per_group;	/* # Blocks per group */
1314 	__le32	s_clusters_per_group;	/* # Clusters per group */
1315 	__le32	s_inodes_per_group;	/* # Inodes per group */
1316 	__le32	s_mtime;		/* Mount time */
1317 /*30*/	__le32	s_wtime;		/* Write time */
1318 	__le16	s_mnt_count;		/* Mount count */
1319 	__le16	s_max_mnt_count;	/* Maximal mount count */
1320 	__le16	s_magic;		/* Magic signature */
1321 	__le16	s_state;		/* File system state */
1322 	__le16	s_errors;		/* Behaviour when detecting errors */
1323 	__le16	s_minor_rev_level;	/* minor revision level */
1324 /*40*/	__le32	s_lastcheck;		/* time of last check */
1325 	__le32	s_checkinterval;	/* max. time between checks */
1326 	__le32	s_creator_os;		/* OS */
1327 	__le32	s_rev_level;		/* Revision level */
1328 /*50*/	__le16	s_def_resuid;		/* Default uid for reserved blocks */
1329 	__le16	s_def_resgid;		/* Default gid for reserved blocks */
1330 	/*
1331 	 * These fields are for EXT4_DYNAMIC_REV superblocks only.
1332 	 *
1333 	 * Note: the difference between the compatible feature set and
1334 	 * the incompatible feature set is that if there is a bit set
1335 	 * in the incompatible feature set that the kernel doesn't
1336 	 * know about, it should refuse to mount the filesystem.
1337 	 *
1338 	 * e2fsck's requirements are more strict; if it doesn't know
1339 	 * about a feature in either the compatible or incompatible
1340 	 * feature set, it must abort and not try to meddle with
1341 	 * things it doesn't understand...
1342 	 */
1343 	__le32	s_first_ino;		/* First non-reserved inode */
1344 	__le16  s_inode_size;		/* size of inode structure */
1345 	__le16	s_block_group_nr;	/* block group # of this superblock */
1346 	__le32	s_feature_compat;	/* compatible feature set */
1347 /*60*/	__le32	s_feature_incompat;	/* incompatible feature set */
1348 	__le32	s_feature_ro_compat;	/* readonly-compatible feature set */
1349 /*68*/	__u8	s_uuid[16];		/* 128-bit uuid for volume */
1350 /*78*/	char	s_volume_name[EXT4_LABEL_MAX] __nonstring; /* volume name */
1351 /*88*/	char	s_last_mounted[64] __nonstring;	/* directory where last mounted */
1352 /*C8*/	__le32	s_algorithm_usage_bitmap; /* For compression */
1353 	/*
1354 	 * Performance hints.  Directory preallocation should only
1355 	 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
1356 	 */
1357 	__u8	s_prealloc_blocks;	/* Nr of blocks to try to preallocate*/
1358 	__u8	s_prealloc_dir_blocks;	/* Nr to preallocate for dirs */
1359 	__le16	s_reserved_gdt_blocks;	/* Per group desc for online growth */
1360 	/*
1361 	 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
1362 	 */
1363 /*D0*/	__u8	s_journal_uuid[16];	/* uuid of journal superblock */
1364 /*E0*/	__le32	s_journal_inum;		/* inode number of journal file */
1365 	__le32	s_journal_dev;		/* device number of journal file */
1366 	__le32	s_last_orphan;		/* start of list of inodes to delete */
1367 	__le32	s_hash_seed[4];		/* HTREE hash seed */
1368 	__u8	s_def_hash_version;	/* Default hash version to use */
1369 	__u8	s_jnl_backup_type;
1370 	__le16  s_desc_size;		/* size of group descriptor */
1371 /*100*/	__le32	s_default_mount_opts;
1372 	__le32	s_first_meta_bg;	/* First metablock block group */
1373 	__le32	s_mkfs_time;		/* When the filesystem was created */
1374 	__le32	s_jnl_blocks[17];	/* Backup of the journal inode */
1375 	/* 64bit support valid if EXT4_FEATURE_INCOMPAT_64BIT */
1376 /*150*/	__le32	s_blocks_count_hi;	/* Blocks count */
1377 	__le32	s_r_blocks_count_hi;	/* Reserved blocks count */
1378 	__le32	s_free_blocks_count_hi;	/* Free blocks count */
1379 	__le16	s_min_extra_isize;	/* All inodes have at least # bytes */
1380 	__le16	s_want_extra_isize; 	/* New inodes should reserve # bytes */
1381 	__le32	s_flags;		/* Miscellaneous flags */
1382 	__le16  s_raid_stride;		/* RAID stride */
1383 	__le16  s_mmp_update_interval;  /* # seconds to wait in MMP checking */
1384 	__le64  s_mmp_block;            /* Block for multi-mount protection */
1385 	__le32  s_raid_stripe_width;    /* blocks on all data disks (N*stride)*/
1386 	__u8	s_log_groups_per_flex;  /* FLEX_BG group size */
1387 	__u8	s_checksum_type;	/* metadata checksum algorithm used */
1388 	__u8	s_encryption_level;	/* versioning level for encryption */
1389 	__u8	s_reserved_pad;		/* Padding to next 32bits */
1390 	__le64	s_kbytes_written;	/* nr of lifetime kilobytes written */
1391 	__le32	s_snapshot_inum;	/* Inode number of active snapshot */
1392 	__le32	s_snapshot_id;		/* sequential ID of active snapshot */
1393 	__le64	s_snapshot_r_blocks_count; /* reserved blocks for active
1394 					      snapshot's future use */
1395 	__le32	s_snapshot_list;	/* inode number of the head of the
1396 					   on-disk snapshot list */
1397 #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count)
1398 	__le32	s_error_count;		/* number of fs errors */
1399 	__le32	s_first_error_time;	/* first time an error happened */
1400 	__le32	s_first_error_ino;	/* inode involved in first error */
1401 	__le64	s_first_error_block;	/* block involved of first error */
1402 	__u8	s_first_error_func[32] __nonstring;	/* function where the error happened */
1403 	__le32	s_first_error_line;	/* line number where error happened */
1404 	__le32	s_last_error_time;	/* most recent time of an error */
1405 	__le32	s_last_error_ino;	/* inode involved in last error */
1406 	__le32	s_last_error_line;	/* line number where error happened */
1407 	__le64	s_last_error_block;	/* block involved of last error */
1408 	__u8	s_last_error_func[32] __nonstring;	/* function where the error happened */
1409 #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts)
1410 	__u8	s_mount_opts[64];
1411 	__le32	s_usr_quota_inum;	/* inode for tracking user quota */
1412 	__le32	s_grp_quota_inum;	/* inode for tracking group quota */
1413 	__le32	s_overhead_clusters;	/* overhead blocks/clusters in fs */
1414 	__le32	s_backup_bgs[2];	/* groups with sparse_super2 SBs */
1415 	__u8	s_encrypt_algos[4];	/* Encryption algorithms in use  */
1416 	__u8	s_encrypt_pw_salt[16];	/* Salt used for string2key algorithm */
1417 	__le32	s_lpf_ino;		/* Location of the lost+found inode */
1418 	__le32	s_prj_quota_inum;	/* inode for tracking project quota */
1419 	__le32	s_checksum_seed;	/* crc32c(uuid) if csum_seed set */
1420 	__u8	s_wtime_hi;
1421 	__u8	s_mtime_hi;
1422 	__u8	s_mkfs_time_hi;
1423 	__u8	s_lastcheck_hi;
1424 	__u8	s_first_error_time_hi;
1425 	__u8	s_last_error_time_hi;
1426 	__u8	s_first_error_errcode;
1427 	__u8    s_last_error_errcode;
1428 	__le16  s_encoding;		/* Filename charset encoding */
1429 	__le16  s_encoding_flags;	/* Filename charset encoding flags */
1430 	__le32  s_orphan_file_inum;	/* Inode for tracking orphan inodes */
1431 	__le32	s_reserved[94];		/* Padding to the end of the block */
1432 	__le32	s_checksum;		/* crc32c(superblock) */
1433 };
1434 
1435 #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START)
1436 
1437 #ifdef __KERNEL__
1438 
1439 /* Number of quota types we support */
1440 #define EXT4_MAXQUOTAS 3
1441 
1442 #define EXT4_ENC_UTF8_12_1	1
1443 
1444 /* Types of ext4 journal triggers */
1445 enum ext4_journal_trigger_type {
1446 	EXT4_JTR_ORPHAN_FILE,
1447 	EXT4_JTR_NONE	/* This must be the last entry for indexing to work! */
1448 };
1449 
1450 #define EXT4_JOURNAL_TRIGGER_COUNT EXT4_JTR_NONE
1451 
1452 struct ext4_journal_trigger {
1453 	struct jbd2_buffer_trigger_type tr_triggers;
1454 	struct super_block *sb;
1455 };
1456 
1457 static inline struct ext4_journal_trigger *EXT4_TRIGGER(
1458 				struct jbd2_buffer_trigger_type *trigger)
1459 {
1460 	return container_of(trigger, struct ext4_journal_trigger, tr_triggers);
1461 }
1462 
1463 #define EXT4_ORPHAN_BLOCK_MAGIC 0x0b10ca04
1464 
1465 /* Structure at the tail of orphan block */
1466 struct ext4_orphan_block_tail {
1467 	__le32 ob_magic;
1468 	__le32 ob_checksum;
1469 };
1470 
1471 static inline int ext4_inodes_per_orphan_block(struct super_block *sb)
1472 {
1473 	return (sb->s_blocksize - sizeof(struct ext4_orphan_block_tail)) /
1474 			sizeof(u32);
1475 }
1476 
1477 struct ext4_orphan_block {
1478 	atomic_t ob_free_entries;	/* Number of free orphan entries in block */
1479 	struct buffer_head *ob_bh;	/* Buffer for orphan block */
1480 };
1481 
1482 /*
1483  * Info about orphan file.
1484  */
1485 struct ext4_orphan_info {
1486 	int of_blocks;			/* Number of orphan blocks in a file */
1487 	__u32 of_csum_seed;		/* Checksum seed for orphan file */
1488 	struct ext4_orphan_block *of_binfo;	/* Array with info about orphan
1489 						 * file blocks */
1490 };
1491 
1492 /*
1493  * fourth extended-fs super-block data in memory
1494  */
1495 struct ext4_sb_info {
1496 	unsigned long s_desc_size;	/* Size of a group descriptor in bytes */
1497 	unsigned long s_inodes_per_block;/* Number of inodes per block */
1498 	unsigned long s_blocks_per_group;/* Number of blocks in a group */
1499 	unsigned long s_clusters_per_group; /* Number of clusters in a group */
1500 	unsigned long s_inodes_per_group;/* Number of inodes in a group */
1501 	unsigned long s_itb_per_group;	/* Number of inode table blocks per group */
1502 	unsigned long s_gdb_count;	/* Number of group descriptor blocks */
1503 	unsigned long s_desc_per_block;	/* Number of group descriptors per block */
1504 	ext4_group_t s_groups_count;	/* Number of groups in the fs */
1505 	ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */
1506 	unsigned long s_overhead;  /* # of fs overhead clusters */
1507 	unsigned int s_cluster_ratio;	/* Number of blocks per cluster */
1508 	unsigned int s_cluster_bits;	/* log2 of s_cluster_ratio */
1509 	loff_t s_bitmap_maxbytes;	/* max bytes for bitmap files */
1510 	struct buffer_head * s_sbh;	/* Buffer containing the super block */
1511 	struct ext4_super_block *s_es;	/* Pointer to the super block in the buffer */
1512 	/* Array of bh's for the block group descriptors */
1513 	struct buffer_head * __rcu *s_group_desc;
1514 	unsigned int s_mount_opt;
1515 	unsigned int s_mount_opt2;
1516 	unsigned long s_mount_flags;
1517 	unsigned int s_def_mount_opt;
1518 	unsigned int s_def_mount_opt2;
1519 	ext4_fsblk_t s_sb_block;
1520 	atomic64_t s_resv_clusters;
1521 	kuid_t s_resuid;
1522 	kgid_t s_resgid;
1523 	unsigned short s_mount_state;
1524 	unsigned short s_pad;
1525 	int s_addr_per_block_bits;
1526 	int s_desc_per_block_bits;
1527 	int s_inode_size;
1528 	int s_first_ino;
1529 	unsigned int s_inode_readahead_blks;
1530 	unsigned int s_inode_goal;
1531 	u32 s_hash_seed[4];
1532 	int s_def_hash_version;
1533 	int s_hash_unsigned;	/* 3 if hash should be unsigned, 0 if not */
1534 	struct percpu_counter s_freeclusters_counter;
1535 	struct percpu_counter s_freeinodes_counter;
1536 	struct percpu_counter s_dirs_counter;
1537 	struct percpu_counter s_dirtyclusters_counter;
1538 	struct percpu_counter s_sra_exceeded_retry_limit;
1539 	struct blockgroup_lock *s_blockgroup_lock;
1540 	struct proc_dir_entry *s_proc;
1541 	struct kobject s_kobj;
1542 	struct completion s_kobj_unregister;
1543 	struct super_block *s_sb;
1544 	struct buffer_head *s_mmp_bh;
1545 
1546 	/* Journaling */
1547 	struct journal_s *s_journal;
1548 	unsigned long s_ext4_flags;		/* Ext4 superblock flags */
1549 	struct mutex s_orphan_lock;	/* Protects on disk list changes */
1550 	struct list_head s_orphan;	/* List of orphaned inodes in on disk
1551 					   list */
1552 	struct ext4_orphan_info s_orphan_info;
1553 	unsigned long s_commit_interval;
1554 	u32 s_max_batch_time;
1555 	u32 s_min_batch_time;
1556 	struct file *s_journal_bdev_file;
1557 #ifdef CONFIG_QUOTA
1558 	/* Names of quota files with journalled quota */
1559 	char __rcu *s_qf_names[EXT4_MAXQUOTAS];
1560 	int s_jquota_fmt;			/* Format of quota to use */
1561 #endif
1562 	unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */
1563 	struct ext4_system_blocks __rcu *s_system_blks;
1564 
1565 #ifdef EXTENTS_STATS
1566 	/* ext4 extents stats */
1567 	unsigned long s_ext_min;
1568 	unsigned long s_ext_max;
1569 	unsigned long s_depth_max;
1570 	spinlock_t s_ext_stats_lock;
1571 	unsigned long s_ext_blocks;
1572 	unsigned long s_ext_extents;
1573 #endif
1574 
1575 	/* for buddy allocator */
1576 	struct ext4_group_info ** __rcu *s_group_info;
1577 	struct inode *s_buddy_cache;
1578 	spinlock_t s_md_lock;
1579 	unsigned short *s_mb_offsets;
1580 	unsigned int *s_mb_maxs;
1581 	unsigned int s_group_info_size;
1582 	unsigned int s_mb_free_pending;
1583 	struct list_head s_freed_data_list[2];	/* List of blocks to be freed
1584 						   after commit completed */
1585 	struct list_head s_discard_list;
1586 	struct work_struct s_discard_work;
1587 	atomic_t s_retry_alloc_pending;
1588 	struct list_head *s_mb_avg_fragment_size;
1589 	rwlock_t *s_mb_avg_fragment_size_locks;
1590 	struct list_head *s_mb_largest_free_orders;
1591 	rwlock_t *s_mb_largest_free_orders_locks;
1592 
1593 	/* tunables */
1594 	unsigned long s_stripe;
1595 	unsigned int s_mb_max_linear_groups;
1596 	unsigned int s_mb_stream_request;
1597 	unsigned int s_mb_max_to_scan;
1598 	unsigned int s_mb_min_to_scan;
1599 	unsigned int s_mb_stats;
1600 	unsigned int s_mb_order2_reqs;
1601 	unsigned int s_mb_group_prealloc;
1602 	unsigned int s_max_dir_size_kb;
1603 	/* where last allocation was done - for stream allocation */
1604 	unsigned long s_mb_last_group;
1605 	unsigned long s_mb_last_start;
1606 	unsigned int s_mb_prefetch;
1607 	unsigned int s_mb_prefetch_limit;
1608 	unsigned int s_mb_best_avail_max_trim_order;
1609 
1610 	/* stats for buddy allocator */
1611 	atomic_t s_bal_reqs;	/* number of reqs with len > 1 */
1612 	atomic_t s_bal_success;	/* we found long enough chunks */
1613 	atomic_t s_bal_allocated;	/* in blocks */
1614 	atomic_t s_bal_ex_scanned;	/* total extents scanned */
1615 	atomic_t s_bal_cX_ex_scanned[EXT4_MB_NUM_CRS];	/* total extents scanned */
1616 	atomic_t s_bal_groups_scanned;	/* number of groups scanned */
1617 	atomic_t s_bal_goals;	/* goal hits */
1618 	atomic_t s_bal_len_goals;	/* len goal hits */
1619 	atomic_t s_bal_breaks;	/* too long searches */
1620 	atomic_t s_bal_2orders;	/* 2^order hits */
1621 	atomic_t s_bal_p2_aligned_bad_suggestions;
1622 	atomic_t s_bal_goal_fast_bad_suggestions;
1623 	atomic_t s_bal_best_avail_bad_suggestions;
1624 	atomic64_t s_bal_cX_groups_considered[EXT4_MB_NUM_CRS];
1625 	atomic64_t s_bal_cX_hits[EXT4_MB_NUM_CRS];
1626 	atomic64_t s_bal_cX_failed[EXT4_MB_NUM_CRS];		/* cX loop didn't find blocks */
1627 	atomic_t s_mb_buddies_generated;	/* number of buddies generated */
1628 	atomic64_t s_mb_generation_time;
1629 	atomic_t s_mb_lost_chunks;
1630 	atomic_t s_mb_preallocated;
1631 	atomic_t s_mb_discarded;
1632 	atomic_t s_lock_busy;
1633 
1634 	/* locality groups */
1635 	struct ext4_locality_group __percpu *s_locality_groups;
1636 
1637 	/* for write statistics */
1638 	unsigned long s_sectors_written_start;
1639 	u64 s_kbytes_written;
1640 
1641 	/* the size of zero-out chunk */
1642 	unsigned int s_extent_max_zeroout_kb;
1643 
1644 	unsigned int s_log_groups_per_flex;
1645 	struct flex_groups * __rcu *s_flex_groups;
1646 	ext4_group_t s_flex_groups_allocated;
1647 
1648 	/* workqueue for reserved extent conversions (buffered io) */
1649 	struct workqueue_struct *rsv_conversion_wq;
1650 
1651 	/* timer for periodic error stats printing */
1652 	struct timer_list s_err_report;
1653 
1654 	/* Lazy inode table initialization info */
1655 	struct ext4_li_request *s_li_request;
1656 	/* Wait multiplier for lazy initialization thread */
1657 	unsigned int s_li_wait_mult;
1658 
1659 	/* Kernel thread for multiple mount protection */
1660 	struct task_struct *s_mmp_tsk;
1661 
1662 	/* record the last minlen when FITRIM is called. */
1663 	unsigned long s_last_trim_minblks;
1664 
1665 	/* Reference to checksum algorithm driver via cryptoapi */
1666 	struct crypto_shash *s_chksum_driver;
1667 
1668 	/* Precomputed FS UUID checksum for seeding other checksums */
1669 	__u32 s_csum_seed;
1670 
1671 	/* Reclaim extents from extent status tree */
1672 	struct shrinker *s_es_shrinker;
1673 	struct list_head s_es_list;	/* List of inodes with reclaimable extents */
1674 	long s_es_nr_inode;
1675 	struct ext4_es_stats s_es_stats;
1676 	struct mb_cache *s_ea_block_cache;
1677 	struct mb_cache *s_ea_inode_cache;
1678 	spinlock_t s_es_lock ____cacheline_aligned_in_smp;
1679 
1680 	/* Journal triggers for checksum computation */
1681 	struct ext4_journal_trigger s_journal_triggers[EXT4_JOURNAL_TRIGGER_COUNT];
1682 
1683 	/* Ratelimit ext4 messages. */
1684 	struct ratelimit_state s_err_ratelimit_state;
1685 	struct ratelimit_state s_warning_ratelimit_state;
1686 	struct ratelimit_state s_msg_ratelimit_state;
1687 	atomic_t s_warning_count;
1688 	atomic_t s_msg_count;
1689 
1690 	/* Encryption policy for '-o test_dummy_encryption' */
1691 	struct fscrypt_dummy_policy s_dummy_enc_policy;
1692 
1693 	/*
1694 	 * Barrier between writepages ops and changing any inode's JOURNAL_DATA
1695 	 * or EXTENTS flag or between writepages ops and changing DELALLOC or
1696 	 * DIOREAD_NOLOCK mount options on remount.
1697 	 */
1698 	struct percpu_rw_semaphore s_writepages_rwsem;
1699 	struct dax_device *s_daxdev;
1700 	u64 s_dax_part_off;
1701 #ifdef CONFIG_EXT4_DEBUG
1702 	unsigned long s_simulate_fail;
1703 #endif
1704 	/* Record the errseq of the backing block device */
1705 	errseq_t s_bdev_wb_err;
1706 	spinlock_t s_bdev_wb_lock;
1707 
1708 	/* Information about errors that happened during this mount */
1709 	spinlock_t s_error_lock;
1710 	int s_add_error_count;
1711 	int s_first_error_code;
1712 	__u32 s_first_error_line;
1713 	__u32 s_first_error_ino;
1714 	__u64 s_first_error_block;
1715 	const char *s_first_error_func;
1716 	time64_t s_first_error_time;
1717 	int s_last_error_code;
1718 	__u32 s_last_error_line;
1719 	__u32 s_last_error_ino;
1720 	__u64 s_last_error_block;
1721 	const char *s_last_error_func;
1722 	time64_t s_last_error_time;
1723 	/*
1724 	 * If we are in a context where we cannot update the on-disk
1725 	 * superblock, we queue the work here.  This is used to update
1726 	 * the error information in the superblock, and for periodic
1727 	 * updates of the superblock called from the commit callback
1728 	 * function.
1729 	 */
1730 	struct work_struct s_sb_upd_work;
1731 
1732 	/* Ext4 fast commit sub transaction ID */
1733 	atomic_t s_fc_subtid;
1734 
1735 	/*
1736 	 * After commit starts, the main queue gets locked, and the further
1737 	 * updates get added in the staging queue.
1738 	 */
1739 #define FC_Q_MAIN	0
1740 #define FC_Q_STAGING	1
1741 	struct list_head s_fc_q[2];	/* Inodes staged for fast commit
1742 					 * that have data changes in them.
1743 					 */
1744 	struct list_head s_fc_dentry_q[2];	/* directory entry updates */
1745 	unsigned int s_fc_bytes;
1746 	/*
1747 	 * Main fast commit lock. This lock protects accesses to the
1748 	 * following fields:
1749 	 * ei->i_fc_list, s_fc_dentry_q, s_fc_q, s_fc_bytes, s_fc_bh.
1750 	 */
1751 	spinlock_t s_fc_lock;
1752 	struct buffer_head *s_fc_bh;
1753 	struct ext4_fc_stats s_fc_stats;
1754 	tid_t s_fc_ineligible_tid;
1755 #ifdef CONFIG_EXT4_DEBUG
1756 	int s_fc_debug_max_replay;
1757 #endif
1758 	struct ext4_fc_replay_state s_fc_replay_state;
1759 };
1760 
1761 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb)
1762 {
1763 	return sb->s_fs_info;
1764 }
1765 static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
1766 {
1767 	return container_of(inode, struct ext4_inode_info, vfs_inode);
1768 }
1769 
1770 static inline int ext4_writepages_down_read(struct super_block *sb)
1771 {
1772 	percpu_down_read(&EXT4_SB(sb)->s_writepages_rwsem);
1773 	return memalloc_nofs_save();
1774 }
1775 
1776 static inline void ext4_writepages_up_read(struct super_block *sb, int ctx)
1777 {
1778 	memalloc_nofs_restore(ctx);
1779 	percpu_up_read(&EXT4_SB(sb)->s_writepages_rwsem);
1780 }
1781 
1782 static inline int ext4_writepages_down_write(struct super_block *sb)
1783 {
1784 	percpu_down_write(&EXT4_SB(sb)->s_writepages_rwsem);
1785 	return memalloc_nofs_save();
1786 }
1787 
1788 static inline void ext4_writepages_up_write(struct super_block *sb, int ctx)
1789 {
1790 	memalloc_nofs_restore(ctx);
1791 	percpu_up_write(&EXT4_SB(sb)->s_writepages_rwsem);
1792 }
1793 
1794 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
1795 {
1796 	return ino == EXT4_ROOT_INO ||
1797 		(ino >= EXT4_FIRST_INO(sb) &&
1798 		 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
1799 }
1800 
1801 /*
1802  * Returns: sbi->field[index]
1803  * Used to access an array element from the following sbi fields which require
1804  * rcu protection to avoid dereferencing an invalid pointer due to reassignment
1805  * - s_group_desc
1806  * - s_group_info
1807  * - s_flex_group
1808  */
1809 #define sbi_array_rcu_deref(sbi, field, index)				   \
1810 ({									   \
1811 	typeof(*((sbi)->field)) _v;					   \
1812 	rcu_read_lock();						   \
1813 	_v = ((typeof(_v)*)rcu_dereference((sbi)->field))[index];	   \
1814 	rcu_read_unlock();						   \
1815 	_v;								   \
1816 })
1817 
1818 /*
1819  * run-time mount flags
1820  */
1821 enum {
1822 	EXT4_MF_MNTDIR_SAMPLED,
1823 	EXT4_MF_FC_INELIGIBLE	/* Fast commit ineligible */
1824 };
1825 
1826 static inline void ext4_set_mount_flag(struct super_block *sb, int bit)
1827 {
1828 	set_bit(bit, &EXT4_SB(sb)->s_mount_flags);
1829 }
1830 
1831 static inline void ext4_clear_mount_flag(struct super_block *sb, int bit)
1832 {
1833 	clear_bit(bit, &EXT4_SB(sb)->s_mount_flags);
1834 }
1835 
1836 static inline int ext4_test_mount_flag(struct super_block *sb, int bit)
1837 {
1838 	return test_bit(bit, &EXT4_SB(sb)->s_mount_flags);
1839 }
1840 
1841 
1842 /*
1843  * Simulate_fail codes
1844  */
1845 #define EXT4_SIM_BBITMAP_EIO	1
1846 #define EXT4_SIM_BBITMAP_CRC	2
1847 #define EXT4_SIM_IBITMAP_EIO	3
1848 #define EXT4_SIM_IBITMAP_CRC	4
1849 #define EXT4_SIM_INODE_EIO	5
1850 #define EXT4_SIM_INODE_CRC	6
1851 #define EXT4_SIM_DIRBLOCK_EIO	7
1852 #define EXT4_SIM_DIRBLOCK_CRC	8
1853 
1854 static inline bool ext4_simulate_fail(struct super_block *sb,
1855 				     unsigned long code)
1856 {
1857 #ifdef CONFIG_EXT4_DEBUG
1858 	struct ext4_sb_info *sbi = EXT4_SB(sb);
1859 
1860 	if (unlikely(sbi->s_simulate_fail == code)) {
1861 		sbi->s_simulate_fail = 0;
1862 		return true;
1863 	}
1864 #endif
1865 	return false;
1866 }
1867 
1868 static inline void ext4_simulate_fail_bh(struct super_block *sb,
1869 					 struct buffer_head *bh,
1870 					 unsigned long code)
1871 {
1872 	if (!IS_ERR(bh) && ext4_simulate_fail(sb, code))
1873 		clear_buffer_uptodate(bh);
1874 }
1875 
1876 /*
1877  * Error number codes for s_{first,last}_error_errno
1878  *
1879  * Linux errno numbers are architecture specific, so we need to translate
1880  * them into something which is architecture independent.   We don't define
1881  * codes for all errno's; just the ones which are most likely to be the cause
1882  * of an ext4_error() call.
1883  */
1884 #define EXT4_ERR_UNKNOWN	 1
1885 #define EXT4_ERR_EIO		 2
1886 #define EXT4_ERR_ENOMEM		 3
1887 #define EXT4_ERR_EFSBADCRC	 4
1888 #define EXT4_ERR_EFSCORRUPTED	 5
1889 #define EXT4_ERR_ENOSPC		 6
1890 #define EXT4_ERR_ENOKEY		 7
1891 #define EXT4_ERR_EROFS		 8
1892 #define EXT4_ERR_EFBIG		 9
1893 #define EXT4_ERR_EEXIST		10
1894 #define EXT4_ERR_ERANGE		11
1895 #define EXT4_ERR_EOVERFLOW	12
1896 #define EXT4_ERR_EBUSY		13
1897 #define EXT4_ERR_ENOTDIR	14
1898 #define EXT4_ERR_ENOTEMPTY	15
1899 #define EXT4_ERR_ESHUTDOWN	16
1900 #define EXT4_ERR_EFAULT		17
1901 
1902 /*
1903  * Inode dynamic state flags
1904  */
1905 enum {
1906 	EXT4_STATE_NEW,			/* inode is newly created */
1907 	EXT4_STATE_XATTR,		/* has in-inode xattrs */
1908 	EXT4_STATE_NO_EXPAND,		/* No space for expansion */
1909 	EXT4_STATE_DA_ALLOC_CLOSE,	/* Alloc DA blks on close */
1910 	EXT4_STATE_EXT_MIGRATE,		/* Inode is migrating */
1911 	EXT4_STATE_NEWENTRY,		/* File just added to dir */
1912 	EXT4_STATE_MAY_INLINE_DATA,	/* may have in-inode data */
1913 	EXT4_STATE_EXT_PRECACHED,	/* extents have been precached */
1914 	EXT4_STATE_LUSTRE_EA_INODE,	/* Lustre-style ea_inode */
1915 	EXT4_STATE_VERITY_IN_PROGRESS,	/* building fs-verity Merkle tree */
1916 	EXT4_STATE_FC_COMMITTING,	/* Fast commit ongoing */
1917 	EXT4_STATE_ORPHAN_FILE,		/* Inode orphaned in orphan file */
1918 };
1919 
1920 #define EXT4_INODE_BIT_FNS(name, field, offset)				\
1921 static inline int ext4_test_inode_##name(struct inode *inode, int bit)	\
1922 {									\
1923 	return test_bit(bit + (offset), &EXT4_I(inode)->i_##field);	\
1924 }									\
1925 static inline void ext4_set_inode_##name(struct inode *inode, int bit)	\
1926 {									\
1927 	set_bit(bit + (offset), &EXT4_I(inode)->i_##field);		\
1928 }									\
1929 static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \
1930 {									\
1931 	clear_bit(bit + (offset), &EXT4_I(inode)->i_##field);		\
1932 }
1933 
1934 /* Add these declarations here only so that these functions can be
1935  * found by name.  Otherwise, they are very hard to locate. */
1936 static inline int ext4_test_inode_flag(struct inode *inode, int bit);
1937 static inline void ext4_set_inode_flag(struct inode *inode, int bit);
1938 static inline void ext4_clear_inode_flag(struct inode *inode, int bit);
1939 EXT4_INODE_BIT_FNS(flag, flags, 0)
1940 
1941 /* Add these declarations here only so that these functions can be
1942  * found by name.  Otherwise, they are very hard to locate. */
1943 static inline int ext4_test_inode_state(struct inode *inode, int bit);
1944 static inline void ext4_set_inode_state(struct inode *inode, int bit);
1945 static inline void ext4_clear_inode_state(struct inode *inode, int bit);
1946 #if (BITS_PER_LONG < 64)
1947 EXT4_INODE_BIT_FNS(state, state_flags, 0)
1948 
1949 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1950 {
1951 	(ei)->i_state_flags = 0;
1952 }
1953 #else
1954 EXT4_INODE_BIT_FNS(state, flags, 32)
1955 
1956 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1957 {
1958 	/* We depend on the fact that callers will set i_flags */
1959 }
1960 #endif
1961 #else
1962 /* Assume that user mode programs are passing in an ext4fs superblock, not
1963  * a kernel struct super_block.  This will allow us to call the feature-test
1964  * macros from user land. */
1965 #define EXT4_SB(sb)	(sb)
1966 #endif
1967 
1968 static inline bool ext4_verity_in_progress(struct inode *inode)
1969 {
1970 	return IS_ENABLED(CONFIG_FS_VERITY) &&
1971 	       ext4_test_inode_state(inode, EXT4_STATE_VERITY_IN_PROGRESS);
1972 }
1973 
1974 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
1975 
1976 /*
1977  * Codes for operating systems
1978  */
1979 #define EXT4_OS_LINUX		0
1980 #define EXT4_OS_HURD		1
1981 #define EXT4_OS_MASIX		2
1982 #define EXT4_OS_FREEBSD		3
1983 #define EXT4_OS_LITES		4
1984 
1985 /*
1986  * Revision levels
1987  */
1988 #define EXT4_GOOD_OLD_REV	0	/* The good old (original) format */
1989 #define EXT4_DYNAMIC_REV	1	/* V2 format w/ dynamic inode sizes */
1990 
1991 #define EXT4_MAX_SUPP_REV	EXT4_DYNAMIC_REV
1992 
1993 #define EXT4_GOOD_OLD_INODE_SIZE 128
1994 
1995 #define EXT4_EXTRA_TIMESTAMP_MAX	(((s64)1 << 34) - 1  + S32_MIN)
1996 #define EXT4_NON_EXTRA_TIMESTAMP_MAX	S32_MAX
1997 #define EXT4_TIMESTAMP_MIN		S32_MIN
1998 
1999 /*
2000  * Feature set definitions
2001  */
2002 
2003 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC	0x0001
2004 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES	0x0002
2005 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL		0x0004
2006 #define EXT4_FEATURE_COMPAT_EXT_ATTR		0x0008
2007 #define EXT4_FEATURE_COMPAT_RESIZE_INODE	0x0010
2008 #define EXT4_FEATURE_COMPAT_DIR_INDEX		0x0020
2009 #define EXT4_FEATURE_COMPAT_SPARSE_SUPER2	0x0200
2010 /*
2011  * The reason why "FAST_COMMIT" is a compat feature is that, FS becomes
2012  * incompatible only if fast commit blocks are present in the FS. Since we
2013  * clear the journal (and thus the fast commit blocks), we don't mark FS as
2014  * incompatible. We also have a JBD2 incompat feature, which gets set when
2015  * there are fast commit blocks present in the journal.
2016  */
2017 #define EXT4_FEATURE_COMPAT_FAST_COMMIT		0x0400
2018 #define EXT4_FEATURE_COMPAT_STABLE_INODES	0x0800
2019 #define EXT4_FEATURE_COMPAT_ORPHAN_FILE		0x1000	/* Orphan file exists */
2020 
2021 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER	0x0001
2022 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE	0x0002
2023 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR	0x0004
2024 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE        0x0008
2025 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM		0x0010
2026 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK	0x0020
2027 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE	0x0040
2028 #define EXT4_FEATURE_RO_COMPAT_QUOTA		0x0100
2029 #define EXT4_FEATURE_RO_COMPAT_BIGALLOC		0x0200
2030 /*
2031  * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM).  When
2032  * METADATA_CSUM is set, group descriptor checksums use the same algorithm as
2033  * all other data structures' checksums.  However, the METADATA_CSUM and
2034  * GDT_CSUM bits are mutually exclusive.
2035  */
2036 #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM	0x0400
2037 #define EXT4_FEATURE_RO_COMPAT_READONLY		0x1000
2038 #define EXT4_FEATURE_RO_COMPAT_PROJECT		0x2000
2039 #define EXT4_FEATURE_RO_COMPAT_VERITY		0x8000
2040 #define EXT4_FEATURE_RO_COMPAT_ORPHAN_PRESENT	0x10000 /* Orphan file may be
2041 							   non-empty */
2042 
2043 #define EXT4_FEATURE_INCOMPAT_COMPRESSION	0x0001
2044 #define EXT4_FEATURE_INCOMPAT_FILETYPE		0x0002
2045 #define EXT4_FEATURE_INCOMPAT_RECOVER		0x0004 /* Needs recovery */
2046 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV	0x0008 /* Journal device */
2047 #define EXT4_FEATURE_INCOMPAT_META_BG		0x0010
2048 #define EXT4_FEATURE_INCOMPAT_EXTENTS		0x0040 /* extents support */
2049 #define EXT4_FEATURE_INCOMPAT_64BIT		0x0080
2050 #define EXT4_FEATURE_INCOMPAT_MMP               0x0100
2051 #define EXT4_FEATURE_INCOMPAT_FLEX_BG		0x0200
2052 #define EXT4_FEATURE_INCOMPAT_EA_INODE		0x0400 /* EA in inode */
2053 #define EXT4_FEATURE_INCOMPAT_DIRDATA		0x1000 /* data in dirent */
2054 #define EXT4_FEATURE_INCOMPAT_CSUM_SEED		0x2000
2055 #define EXT4_FEATURE_INCOMPAT_LARGEDIR		0x4000 /* >2GB or 3-lvl htree */
2056 #define EXT4_FEATURE_INCOMPAT_INLINE_DATA	0x8000 /* data in inode */
2057 #define EXT4_FEATURE_INCOMPAT_ENCRYPT		0x10000
2058 #define EXT4_FEATURE_INCOMPAT_CASEFOLD		0x20000
2059 
2060 extern void ext4_update_dynamic_rev(struct super_block *sb);
2061 
2062 #define EXT4_FEATURE_COMPAT_FUNCS(name, flagname) \
2063 static inline bool ext4_has_feature_##name(struct super_block *sb) \
2064 { \
2065 	return ((EXT4_SB(sb)->s_es->s_feature_compat & \
2066 		cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname)) != 0); \
2067 } \
2068 static inline void ext4_set_feature_##name(struct super_block *sb) \
2069 { \
2070 	ext4_update_dynamic_rev(sb); \
2071 	EXT4_SB(sb)->s_es->s_feature_compat |= \
2072 		cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \
2073 } \
2074 static inline void ext4_clear_feature_##name(struct super_block *sb) \
2075 { \
2076 	EXT4_SB(sb)->s_es->s_feature_compat &= \
2077 		~cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \
2078 }
2079 
2080 #define EXT4_FEATURE_RO_COMPAT_FUNCS(name, flagname) \
2081 static inline bool ext4_has_feature_##name(struct super_block *sb) \
2082 { \
2083 	return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \
2084 		cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname)) != 0); \
2085 } \
2086 static inline void ext4_set_feature_##name(struct super_block *sb) \
2087 { \
2088 	ext4_update_dynamic_rev(sb); \
2089 	EXT4_SB(sb)->s_es->s_feature_ro_compat |= \
2090 		cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \
2091 } \
2092 static inline void ext4_clear_feature_##name(struct super_block *sb) \
2093 { \
2094 	EXT4_SB(sb)->s_es->s_feature_ro_compat &= \
2095 		~cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \
2096 }
2097 
2098 #define EXT4_FEATURE_INCOMPAT_FUNCS(name, flagname) \
2099 static inline bool ext4_has_feature_##name(struct super_block *sb) \
2100 { \
2101 	return ((EXT4_SB(sb)->s_es->s_feature_incompat & \
2102 		cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname)) != 0); \
2103 } \
2104 static inline void ext4_set_feature_##name(struct super_block *sb) \
2105 { \
2106 	ext4_update_dynamic_rev(sb); \
2107 	EXT4_SB(sb)->s_es->s_feature_incompat |= \
2108 		cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \
2109 } \
2110 static inline void ext4_clear_feature_##name(struct super_block *sb) \
2111 { \
2112 	EXT4_SB(sb)->s_es->s_feature_incompat &= \
2113 		~cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \
2114 }
2115 
2116 EXT4_FEATURE_COMPAT_FUNCS(dir_prealloc,		DIR_PREALLOC)
2117 EXT4_FEATURE_COMPAT_FUNCS(imagic_inodes,	IMAGIC_INODES)
2118 EXT4_FEATURE_COMPAT_FUNCS(journal,		HAS_JOURNAL)
2119 EXT4_FEATURE_COMPAT_FUNCS(xattr,		EXT_ATTR)
2120 EXT4_FEATURE_COMPAT_FUNCS(resize_inode,		RESIZE_INODE)
2121 EXT4_FEATURE_COMPAT_FUNCS(dir_index,		DIR_INDEX)
2122 EXT4_FEATURE_COMPAT_FUNCS(sparse_super2,	SPARSE_SUPER2)
2123 EXT4_FEATURE_COMPAT_FUNCS(fast_commit,		FAST_COMMIT)
2124 EXT4_FEATURE_COMPAT_FUNCS(stable_inodes,	STABLE_INODES)
2125 EXT4_FEATURE_COMPAT_FUNCS(orphan_file,		ORPHAN_FILE)
2126 
2127 EXT4_FEATURE_RO_COMPAT_FUNCS(sparse_super,	SPARSE_SUPER)
2128 EXT4_FEATURE_RO_COMPAT_FUNCS(large_file,	LARGE_FILE)
2129 EXT4_FEATURE_RO_COMPAT_FUNCS(btree_dir,		BTREE_DIR)
2130 EXT4_FEATURE_RO_COMPAT_FUNCS(huge_file,		HUGE_FILE)
2131 EXT4_FEATURE_RO_COMPAT_FUNCS(gdt_csum,		GDT_CSUM)
2132 EXT4_FEATURE_RO_COMPAT_FUNCS(dir_nlink,		DIR_NLINK)
2133 EXT4_FEATURE_RO_COMPAT_FUNCS(extra_isize,	EXTRA_ISIZE)
2134 EXT4_FEATURE_RO_COMPAT_FUNCS(quota,		QUOTA)
2135 EXT4_FEATURE_RO_COMPAT_FUNCS(bigalloc,		BIGALLOC)
2136 EXT4_FEATURE_RO_COMPAT_FUNCS(metadata_csum,	METADATA_CSUM)
2137 EXT4_FEATURE_RO_COMPAT_FUNCS(readonly,		READONLY)
2138 EXT4_FEATURE_RO_COMPAT_FUNCS(project,		PROJECT)
2139 EXT4_FEATURE_RO_COMPAT_FUNCS(verity,		VERITY)
2140 EXT4_FEATURE_RO_COMPAT_FUNCS(orphan_present,	ORPHAN_PRESENT)
2141 
2142 EXT4_FEATURE_INCOMPAT_FUNCS(compression,	COMPRESSION)
2143 EXT4_FEATURE_INCOMPAT_FUNCS(filetype,		FILETYPE)
2144 EXT4_FEATURE_INCOMPAT_FUNCS(journal_needs_recovery,	RECOVER)
2145 EXT4_FEATURE_INCOMPAT_FUNCS(journal_dev,	JOURNAL_DEV)
2146 EXT4_FEATURE_INCOMPAT_FUNCS(meta_bg,		META_BG)
2147 EXT4_FEATURE_INCOMPAT_FUNCS(extents,		EXTENTS)
2148 EXT4_FEATURE_INCOMPAT_FUNCS(64bit,		64BIT)
2149 EXT4_FEATURE_INCOMPAT_FUNCS(mmp,		MMP)
2150 EXT4_FEATURE_INCOMPAT_FUNCS(flex_bg,		FLEX_BG)
2151 EXT4_FEATURE_INCOMPAT_FUNCS(ea_inode,		EA_INODE)
2152 EXT4_FEATURE_INCOMPAT_FUNCS(dirdata,		DIRDATA)
2153 EXT4_FEATURE_INCOMPAT_FUNCS(csum_seed,		CSUM_SEED)
2154 EXT4_FEATURE_INCOMPAT_FUNCS(largedir,		LARGEDIR)
2155 EXT4_FEATURE_INCOMPAT_FUNCS(inline_data,	INLINE_DATA)
2156 EXT4_FEATURE_INCOMPAT_FUNCS(encrypt,		ENCRYPT)
2157 EXT4_FEATURE_INCOMPAT_FUNCS(casefold,		CASEFOLD)
2158 
2159 #define EXT2_FEATURE_COMPAT_SUPP	EXT4_FEATURE_COMPAT_EXT_ATTR
2160 #define EXT2_FEATURE_INCOMPAT_SUPP	(EXT4_FEATURE_INCOMPAT_FILETYPE| \
2161 					 EXT4_FEATURE_INCOMPAT_META_BG)
2162 #define EXT2_FEATURE_RO_COMPAT_SUPP	(EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
2163 					 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
2164 					 EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
2165 
2166 #define EXT3_FEATURE_COMPAT_SUPP	EXT4_FEATURE_COMPAT_EXT_ATTR
2167 #define EXT3_FEATURE_INCOMPAT_SUPP	(EXT4_FEATURE_INCOMPAT_FILETYPE| \
2168 					 EXT4_FEATURE_INCOMPAT_RECOVER| \
2169 					 EXT4_FEATURE_INCOMPAT_META_BG)
2170 #define EXT3_FEATURE_RO_COMPAT_SUPP	(EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
2171 					 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
2172 					 EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
2173 
2174 #define EXT4_FEATURE_COMPAT_SUPP	(EXT4_FEATURE_COMPAT_EXT_ATTR| \
2175 					 EXT4_FEATURE_COMPAT_ORPHAN_FILE)
2176 #define EXT4_FEATURE_INCOMPAT_SUPP	(EXT4_FEATURE_INCOMPAT_FILETYPE| \
2177 					 EXT4_FEATURE_INCOMPAT_RECOVER| \
2178 					 EXT4_FEATURE_INCOMPAT_META_BG| \
2179 					 EXT4_FEATURE_INCOMPAT_EXTENTS| \
2180 					 EXT4_FEATURE_INCOMPAT_64BIT| \
2181 					 EXT4_FEATURE_INCOMPAT_FLEX_BG| \
2182 					 EXT4_FEATURE_INCOMPAT_EA_INODE| \
2183 					 EXT4_FEATURE_INCOMPAT_MMP | \
2184 					 EXT4_FEATURE_INCOMPAT_INLINE_DATA | \
2185 					 EXT4_FEATURE_INCOMPAT_ENCRYPT | \
2186 					 EXT4_FEATURE_INCOMPAT_CASEFOLD | \
2187 					 EXT4_FEATURE_INCOMPAT_CSUM_SEED | \
2188 					 EXT4_FEATURE_INCOMPAT_LARGEDIR)
2189 #define EXT4_FEATURE_RO_COMPAT_SUPP	(EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
2190 					 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
2191 					 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
2192 					 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
2193 					 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
2194 					 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
2195 					 EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\
2196 					 EXT4_FEATURE_RO_COMPAT_BIGALLOC |\
2197 					 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\
2198 					 EXT4_FEATURE_RO_COMPAT_QUOTA |\
2199 					 EXT4_FEATURE_RO_COMPAT_PROJECT |\
2200 					 EXT4_FEATURE_RO_COMPAT_VERITY |\
2201 					 EXT4_FEATURE_RO_COMPAT_ORPHAN_PRESENT)
2202 
2203 #define EXTN_FEATURE_FUNCS(ver) \
2204 static inline bool ext4_has_unknown_ext##ver##_compat_features(struct super_block *sb) \
2205 { \
2206 	return ((EXT4_SB(sb)->s_es->s_feature_compat & \
2207 		cpu_to_le32(~EXT##ver##_FEATURE_COMPAT_SUPP)) != 0); \
2208 } \
2209 static inline bool ext4_has_unknown_ext##ver##_ro_compat_features(struct super_block *sb) \
2210 { \
2211 	return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \
2212 		cpu_to_le32(~EXT##ver##_FEATURE_RO_COMPAT_SUPP)) != 0); \
2213 } \
2214 static inline bool ext4_has_unknown_ext##ver##_incompat_features(struct super_block *sb) \
2215 { \
2216 	return ((EXT4_SB(sb)->s_es->s_feature_incompat & \
2217 		cpu_to_le32(~EXT##ver##_FEATURE_INCOMPAT_SUPP)) != 0); \
2218 }
2219 
2220 EXTN_FEATURE_FUNCS(2)
2221 EXTN_FEATURE_FUNCS(3)
2222 EXTN_FEATURE_FUNCS(4)
2223 
2224 static inline bool ext4_has_compat_features(struct super_block *sb)
2225 {
2226 	return (EXT4_SB(sb)->s_es->s_feature_compat != 0);
2227 }
2228 static inline bool ext4_has_ro_compat_features(struct super_block *sb)
2229 {
2230 	return (EXT4_SB(sb)->s_es->s_feature_ro_compat != 0);
2231 }
2232 static inline bool ext4_has_incompat_features(struct super_block *sb)
2233 {
2234 	return (EXT4_SB(sb)->s_es->s_feature_incompat != 0);
2235 }
2236 
2237 extern int ext4_feature_set_ok(struct super_block *sb, int readonly);
2238 
2239 /*
2240  * Superblock flags
2241  */
2242 #define EXT4_FLAGS_RESIZING	0
2243 #define EXT4_FLAGS_SHUTDOWN	1
2244 #define EXT4_FLAGS_BDEV_IS_DAX	2
2245 
2246 static inline int ext4_forced_shutdown(struct super_block *sb)
2247 {
2248 	return test_bit(EXT4_FLAGS_SHUTDOWN, &EXT4_SB(sb)->s_ext4_flags);
2249 }
2250 
2251 /*
2252  * Default values for user and/or group using reserved blocks
2253  */
2254 #define	EXT4_DEF_RESUID		0
2255 #define	EXT4_DEF_RESGID		0
2256 
2257 /*
2258  * Default project ID
2259  */
2260 #define	EXT4_DEF_PROJID		0
2261 
2262 #define EXT4_DEF_INODE_READAHEAD_BLKS	32
2263 
2264 /*
2265  * Default mount options
2266  */
2267 #define EXT4_DEFM_DEBUG		0x0001
2268 #define EXT4_DEFM_BSDGROUPS	0x0002
2269 #define EXT4_DEFM_XATTR_USER	0x0004
2270 #define EXT4_DEFM_ACL		0x0008
2271 #define EXT4_DEFM_UID16		0x0010
2272 #define EXT4_DEFM_JMODE		0x0060
2273 #define EXT4_DEFM_JMODE_DATA	0x0020
2274 #define EXT4_DEFM_JMODE_ORDERED	0x0040
2275 #define EXT4_DEFM_JMODE_WBACK	0x0060
2276 #define EXT4_DEFM_NOBARRIER	0x0100
2277 #define EXT4_DEFM_BLOCK_VALIDITY 0x0200
2278 #define EXT4_DEFM_DISCARD	0x0400
2279 #define EXT4_DEFM_NODELALLOC	0x0800
2280 
2281 /*
2282  * Default journal batch times
2283  */
2284 #define EXT4_DEF_MIN_BATCH_TIME	0
2285 #define EXT4_DEF_MAX_BATCH_TIME	15000 /* 15ms */
2286 
2287 /*
2288  * Minimum number of groups in a flexgroup before we separate out
2289  * directories into the first block group of a flexgroup
2290  */
2291 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME	4
2292 
2293 /*
2294  * Structure of a directory entry
2295  */
2296 #define EXT4_NAME_LEN 255
2297 /*
2298  * Base length of the ext4 directory entry excluding the name length
2299  */
2300 #define EXT4_BASE_DIR_LEN (sizeof(struct ext4_dir_entry_2) - EXT4_NAME_LEN)
2301 
2302 struct ext4_dir_entry {
2303 	__le32	inode;			/* Inode number */
2304 	__le16	rec_len;		/* Directory entry length */
2305 	__le16	name_len;		/* Name length */
2306 	char	name[EXT4_NAME_LEN];	/* File name */
2307 };
2308 
2309 
2310 /*
2311  * Encrypted Casefolded entries require saving the hash on disk. This structure
2312  * followed ext4_dir_entry_2's name[name_len] at the next 4 byte aligned
2313  * boundary.
2314  */
2315 struct ext4_dir_entry_hash {
2316 	__le32 hash;
2317 	__le32 minor_hash;
2318 };
2319 
2320 /*
2321  * The new version of the directory entry.  Since EXT4 structures are
2322  * stored in intel byte order, and the name_len field could never be
2323  * bigger than 255 chars, it's safe to reclaim the extra byte for the
2324  * file_type field.
2325  */
2326 struct ext4_dir_entry_2 {
2327 	__le32	inode;			/* Inode number */
2328 	__le16	rec_len;		/* Directory entry length */
2329 	__u8	name_len;		/* Name length */
2330 	__u8	file_type;		/* See file type macros EXT4_FT_* below */
2331 	char	name[EXT4_NAME_LEN];	/* File name */
2332 };
2333 
2334 /*
2335  * Access the hashes at the end of ext4_dir_entry_2
2336  */
2337 #define EXT4_DIRENT_HASHES(entry) \
2338 	((struct ext4_dir_entry_hash *) \
2339 		(((void *)(entry)) + \
2340 		((8 + (entry)->name_len + EXT4_DIR_ROUND) & ~EXT4_DIR_ROUND)))
2341 #define EXT4_DIRENT_HASH(entry) le32_to_cpu(EXT4_DIRENT_HASHES(de)->hash)
2342 #define EXT4_DIRENT_MINOR_HASH(entry) \
2343 		le32_to_cpu(EXT4_DIRENT_HASHES(de)->minor_hash)
2344 
2345 static inline bool ext4_hash_in_dirent(const struct inode *inode)
2346 {
2347 	return IS_CASEFOLDED(inode) && IS_ENCRYPTED(inode);
2348 }
2349 
2350 /*
2351  * This is a bogus directory entry at the end of each leaf block that
2352  * records checksums.
2353  */
2354 struct ext4_dir_entry_tail {
2355 	__le32	det_reserved_zero1;	/* Pretend to be unused */
2356 	__le16	det_rec_len;		/* 12 */
2357 	__u8	det_reserved_zero2;	/* Zero name length */
2358 	__u8	det_reserved_ft;	/* 0xDE, fake file type */
2359 	__le32	det_checksum;		/* crc32c(uuid+inum+dirblock) */
2360 };
2361 
2362 #define EXT4_DIRENT_TAIL(block, blocksize) \
2363 	((struct ext4_dir_entry_tail *)(((void *)(block)) + \
2364 					((blocksize) - \
2365 					 sizeof(struct ext4_dir_entry_tail))))
2366 
2367 /*
2368  * Ext4 directory file types.  Only the low 3 bits are used.  The
2369  * other bits are reserved for now.
2370  */
2371 #define EXT4_FT_UNKNOWN		0
2372 #define EXT4_FT_REG_FILE	1
2373 #define EXT4_FT_DIR		2
2374 #define EXT4_FT_CHRDEV		3
2375 #define EXT4_FT_BLKDEV		4
2376 #define EXT4_FT_FIFO		5
2377 #define EXT4_FT_SOCK		6
2378 #define EXT4_FT_SYMLINK		7
2379 
2380 #define EXT4_FT_MAX		8
2381 
2382 #define EXT4_FT_DIR_CSUM	0xDE
2383 
2384 /*
2385  * EXT4_DIR_PAD defines the directory entries boundaries
2386  *
2387  * NOTE: It must be a multiple of 4
2388  */
2389 #define EXT4_DIR_PAD			4
2390 #define EXT4_DIR_ROUND			(EXT4_DIR_PAD - 1)
2391 #define EXT4_MAX_REC_LEN		((1<<16)-1)
2392 
2393 /*
2394  * The rec_len is dependent on the type of directory. Directories that are
2395  * casefolded and encrypted need to store the hash as well, so we add room for
2396  * ext4_extended_dir_entry_2. For all entries related to '.' or '..' you should
2397  * pass NULL for dir, as those entries do not use the extra fields.
2398  */
2399 static inline unsigned int ext4_dir_rec_len(__u8 name_len,
2400 						const struct inode *dir)
2401 {
2402 	int rec_len = (name_len + 8 + EXT4_DIR_ROUND);
2403 
2404 	if (dir && ext4_hash_in_dirent(dir))
2405 		rec_len += sizeof(struct ext4_dir_entry_hash);
2406 	return (rec_len & ~EXT4_DIR_ROUND);
2407 }
2408 
2409 /*
2410  * If we ever get support for fs block sizes > page_size, we'll need
2411  * to remove the #if statements in the next two functions...
2412  */
2413 static inline unsigned int
2414 ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize)
2415 {
2416 	unsigned len = le16_to_cpu(dlen);
2417 
2418 #if (PAGE_SIZE >= 65536)
2419 	if (len == EXT4_MAX_REC_LEN || len == 0)
2420 		return blocksize;
2421 	return (len & 65532) | ((len & 3) << 16);
2422 #else
2423 	return len;
2424 #endif
2425 }
2426 
2427 static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize)
2428 {
2429 	BUG_ON((len > blocksize) || (blocksize > (1 << 18)) || (len & 3));
2430 #if (PAGE_SIZE >= 65536)
2431 	if (len < 65536)
2432 		return cpu_to_le16(len);
2433 	if (len == blocksize) {
2434 		if (blocksize == 65536)
2435 			return cpu_to_le16(EXT4_MAX_REC_LEN);
2436 		else
2437 			return cpu_to_le16(0);
2438 	}
2439 	return cpu_to_le16((len & 65532) | ((len >> 16) & 3));
2440 #else
2441 	return cpu_to_le16(len);
2442 #endif
2443 }
2444 
2445 /*
2446  * Hash Tree Directory indexing
2447  * (c) Daniel Phillips, 2001
2448  */
2449 
2450 #define is_dx(dir) (ext4_has_feature_dir_index((dir)->i_sb) && \
2451 		    ext4_test_inode_flag((dir), EXT4_INODE_INDEX))
2452 #define EXT4_DIR_LINK_MAX(dir) unlikely((dir)->i_nlink >= EXT4_LINK_MAX && \
2453 		    !(ext4_has_feature_dir_nlink((dir)->i_sb) && is_dx(dir)))
2454 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
2455 
2456 /* Legal values for the dx_root hash_version field: */
2457 
2458 #define DX_HASH_LEGACY			0
2459 #define DX_HASH_HALF_MD4		1
2460 #define DX_HASH_TEA			2
2461 #define DX_HASH_LEGACY_UNSIGNED		3
2462 #define DX_HASH_HALF_MD4_UNSIGNED	4
2463 #define DX_HASH_TEA_UNSIGNED		5
2464 #define DX_HASH_SIPHASH			6
2465 
2466 static inline u32 ext4_chksum(struct ext4_sb_info *sbi, u32 crc,
2467 			      const void *address, unsigned int length)
2468 {
2469 	struct {
2470 		struct shash_desc shash;
2471 		char ctx[4];
2472 	} desc;
2473 
2474 	BUG_ON(crypto_shash_descsize(sbi->s_chksum_driver)!=sizeof(desc.ctx));
2475 
2476 	desc.shash.tfm = sbi->s_chksum_driver;
2477 	*(u32 *)desc.ctx = crc;
2478 
2479 	BUG_ON(crypto_shash_update(&desc.shash, address, length));
2480 
2481 	return *(u32 *)desc.ctx;
2482 }
2483 
2484 #ifdef __KERNEL__
2485 
2486 /* hash info structure used by the directory hash */
2487 struct dx_hash_info
2488 {
2489 	u32		hash;
2490 	u32		minor_hash;
2491 	int		hash_version;
2492 	u32		*seed;
2493 };
2494 
2495 
2496 /* 32 and 64 bit signed EOF for dx directories */
2497 #define EXT4_HTREE_EOF_32BIT   ((1UL  << (32 - 1)) - 1)
2498 #define EXT4_HTREE_EOF_64BIT   ((1ULL << (64 - 1)) - 1)
2499 
2500 
2501 /*
2502  * Control parameters used by ext4_htree_next_block
2503  */
2504 #define HASH_NB_ALWAYS		1
2505 
2506 struct ext4_filename {
2507 	const struct qstr *usr_fname;
2508 	struct fscrypt_str disk_name;
2509 	struct dx_hash_info hinfo;
2510 #ifdef CONFIG_FS_ENCRYPTION
2511 	struct fscrypt_str crypto_buf;
2512 #endif
2513 #if IS_ENABLED(CONFIG_UNICODE)
2514 	struct qstr cf_name;
2515 #endif
2516 };
2517 
2518 #define fname_name(p) ((p)->disk_name.name)
2519 #define fname_usr_name(p) ((p)->usr_fname->name)
2520 #define fname_len(p)  ((p)->disk_name.len)
2521 
2522 /*
2523  * Describe an inode's exact location on disk and in memory
2524  */
2525 struct ext4_iloc
2526 {
2527 	struct buffer_head *bh;
2528 	unsigned long offset;
2529 	ext4_group_t block_group;
2530 };
2531 
2532 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
2533 {
2534 	return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
2535 }
2536 
2537 static inline bool ext4_is_quota_file(struct inode *inode)
2538 {
2539 	return IS_NOQUOTA(inode) &&
2540 	       !(EXT4_I(inode)->i_flags & EXT4_EA_INODE_FL);
2541 }
2542 
2543 /*
2544  * This structure is stuffed into the struct file's private_data field
2545  * for directories.  It is where we put information so that we can do
2546  * readdir operations in hash tree order.
2547  */
2548 struct dir_private_info {
2549 	struct rb_root	root;
2550 	struct rb_node	*curr_node;
2551 	struct fname	*extra_fname;
2552 	loff_t		last_pos;
2553 	__u32		curr_hash;
2554 	__u32		curr_minor_hash;
2555 	__u32		next_hash;
2556 	u64		cookie;
2557 	bool		initialized;
2558 };
2559 
2560 /* calculate the first block number of the group */
2561 static inline ext4_fsblk_t
2562 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no)
2563 {
2564 	return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
2565 		le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
2566 }
2567 
2568 /*
2569  * Special error return code only used by dx_probe() and its callers.
2570  */
2571 #define ERR_BAD_DX_DIR	(-(MAX_ERRNO - 1))
2572 
2573 /* htree levels for ext4 */
2574 #define	EXT4_HTREE_LEVEL_COMPAT	2
2575 #define	EXT4_HTREE_LEVEL	3
2576 
2577 static inline int ext4_dir_htree_level(struct super_block *sb)
2578 {
2579 	return ext4_has_feature_largedir(sb) ?
2580 		EXT4_HTREE_LEVEL : EXT4_HTREE_LEVEL_COMPAT;
2581 }
2582 
2583 /*
2584  * Timeout and state flag for lazy initialization inode thread.
2585  */
2586 #define EXT4_DEF_LI_WAIT_MULT			10
2587 #define EXT4_DEF_LI_MAX_START_DELAY		5
2588 #define EXT4_LAZYINIT_QUIT			0x0001
2589 #define EXT4_LAZYINIT_RUNNING			0x0002
2590 
2591 /*
2592  * Lazy inode table initialization info
2593  */
2594 struct ext4_lazy_init {
2595 	unsigned long		li_state;
2596 	struct list_head	li_request_list;
2597 	struct mutex		li_list_mtx;
2598 };
2599 
2600 enum ext4_li_mode {
2601 	EXT4_LI_MODE_PREFETCH_BBITMAP,
2602 	EXT4_LI_MODE_ITABLE,
2603 };
2604 
2605 struct ext4_li_request {
2606 	struct super_block	*lr_super;
2607 	enum ext4_li_mode	lr_mode;
2608 	ext4_group_t		lr_first_not_zeroed;
2609 	ext4_group_t		lr_next_group;
2610 	struct list_head	lr_request;
2611 	unsigned long		lr_next_sched;
2612 	unsigned long		lr_timeout;
2613 };
2614 
2615 struct ext4_features {
2616 	struct kobject f_kobj;
2617 	struct completion f_kobj_unregister;
2618 };
2619 
2620 /*
2621  * This structure will be used for multiple mount protection. It will be
2622  * written into the block number saved in the s_mmp_block field in the
2623  * superblock. Programs that check MMP should assume that if
2624  * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe
2625  * to use the filesystem, regardless of how old the timestamp is.
2626  */
2627 #define EXT4_MMP_MAGIC     0x004D4D50U /* ASCII for MMP */
2628 #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */
2629 #define EXT4_MMP_SEQ_FSCK  0xE24D4D50U /* mmp_seq value when being fscked */
2630 #define EXT4_MMP_SEQ_MAX   0xE24D4D4FU /* maximum valid mmp_seq value */
2631 
2632 struct mmp_struct {
2633 	__le32	mmp_magic;		/* Magic number for MMP */
2634 	__le32	mmp_seq;		/* Sequence no. updated periodically */
2635 
2636 	/*
2637 	 * mmp_time, mmp_nodename & mmp_bdevname are only used for information
2638 	 * purposes and do not affect the correctness of the algorithm
2639 	 */
2640 	__le64	mmp_time;		/* Time last updated */
2641 	char	mmp_nodename[64];	/* Node which last updated MMP block */
2642 	char	mmp_bdevname[32];	/* Bdev which last updated MMP block */
2643 
2644 	/*
2645 	 * mmp_check_interval is used to verify if the MMP block has been
2646 	 * updated on the block device. The value is updated based on the
2647 	 * maximum time to write the MMP block during an update cycle.
2648 	 */
2649 	__le16	mmp_check_interval;
2650 
2651 	__le16	mmp_pad1;
2652 	__le32	mmp_pad2[226];
2653 	__le32	mmp_checksum;		/* crc32c(uuid+mmp_block) */
2654 };
2655 
2656 /* arguments passed to the mmp thread */
2657 struct mmpd_data {
2658 	struct buffer_head *bh; /* bh from initial read_mmp_block() */
2659 	struct super_block *sb;  /* super block of the fs */
2660 };
2661 
2662 /*
2663  * Check interval multiplier
2664  * The MMP block is written every update interval and initially checked every
2665  * update interval x the multiplier (the value is then adapted based on the
2666  * write latency). The reason is that writes can be delayed under load and we
2667  * don't want readers to incorrectly assume that the filesystem is no longer
2668  * in use.
2669  */
2670 #define EXT4_MMP_CHECK_MULT		2UL
2671 
2672 /*
2673  * Minimum interval for MMP checking in seconds.
2674  */
2675 #define EXT4_MMP_MIN_CHECK_INTERVAL	5UL
2676 
2677 /*
2678  * Maximum interval for MMP checking in seconds.
2679  */
2680 #define EXT4_MMP_MAX_CHECK_INTERVAL	300UL
2681 
2682 /*
2683  * Function prototypes
2684  */
2685 
2686 /*
2687  * Ok, these declarations are also in <linux/kernel.h> but none of the
2688  * ext4 source programs needs to include it so they are duplicated here.
2689  */
2690 # define NORET_TYPE	/**/
2691 # define ATTRIB_NORET	__attribute__((noreturn))
2692 # define NORET_AND	noreturn,
2693 
2694 /* bitmap.c */
2695 extern unsigned int ext4_count_free(char *bitmap, unsigned numchars);
2696 void ext4_inode_bitmap_csum_set(struct super_block *sb,
2697 				struct ext4_group_desc *gdp,
2698 				struct buffer_head *bh, int sz);
2699 int ext4_inode_bitmap_csum_verify(struct super_block *sb,
2700 				  struct ext4_group_desc *gdp,
2701 				  struct buffer_head *bh, int sz);
2702 void ext4_block_bitmap_csum_set(struct super_block *sb,
2703 				struct ext4_group_desc *gdp,
2704 				struct buffer_head *bh);
2705 int ext4_block_bitmap_csum_verify(struct super_block *sb,
2706 				  struct ext4_group_desc *gdp,
2707 				  struct buffer_head *bh);
2708 
2709 /* balloc.c */
2710 extern void ext4_get_group_no_and_offset(struct super_block *sb,
2711 					 ext4_fsblk_t blocknr,
2712 					 ext4_group_t *blockgrpp,
2713 					 ext4_grpblk_t *offsetp);
2714 extern ext4_group_t ext4_get_group_number(struct super_block *sb,
2715 					  ext4_fsblk_t block);
2716 
2717 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group);
2718 extern unsigned long ext4_bg_num_gdb(struct super_block *sb,
2719 			ext4_group_t group);
2720 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,
2721 					 ext4_fsblk_t goal,
2722 					 unsigned int flags,
2723 					 unsigned long *count,
2724 					 int *errp);
2725 extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi,
2726 				    s64 nclusters, unsigned int flags);
2727 extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *);
2728 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
2729 						    ext4_group_t block_group,
2730 						    struct buffer_head ** bh);
2731 extern struct ext4_group_info *ext4_get_group_info(struct super_block *sb,
2732 						   ext4_group_t group);
2733 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
2734 
2735 extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb,
2736 						ext4_group_t block_group,
2737 						bool ignore_locked);
2738 extern int ext4_wait_block_bitmap(struct super_block *sb,
2739 				  ext4_group_t block_group,
2740 				  struct buffer_head *bh);
2741 extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb,
2742 						  ext4_group_t block_group);
2743 extern unsigned ext4_free_clusters_after_init(struct super_block *sb,
2744 					      ext4_group_t block_group,
2745 					      struct ext4_group_desc *gdp);
2746 ext4_fsblk_t ext4_inode_to_goal_block(struct inode *);
2747 
2748 #if IS_ENABLED(CONFIG_UNICODE)
2749 extern int ext4_fname_setup_ci_filename(struct inode *dir,
2750 					const struct qstr *iname,
2751 					struct ext4_filename *fname);
2752 
2753 static inline void ext4_fname_free_ci_filename(struct ext4_filename *fname)
2754 {
2755 	kfree(fname->cf_name.name);
2756 	fname->cf_name.name = NULL;
2757 }
2758 #else
2759 static inline int ext4_fname_setup_ci_filename(struct inode *dir,
2760 					       const struct qstr *iname,
2761 					       struct ext4_filename *fname)
2762 {
2763 	return 0;
2764 }
2765 
2766 static inline void ext4_fname_free_ci_filename(struct ext4_filename *fname)
2767 {
2768 }
2769 #endif
2770 
2771 /* ext4 encryption related stuff goes here crypto.c */
2772 #ifdef CONFIG_FS_ENCRYPTION
2773 extern const struct fscrypt_operations ext4_cryptops;
2774 
2775 int ext4_fname_setup_filename(struct inode *dir, const struct qstr *iname,
2776 			      int lookup, struct ext4_filename *fname);
2777 
2778 int ext4_fname_prepare_lookup(struct inode *dir, struct dentry *dentry,
2779 			      struct ext4_filename *fname);
2780 
2781 void ext4_fname_free_filename(struct ext4_filename *fname);
2782 
2783 int ext4_ioctl_get_encryption_pwsalt(struct file *filp, void __user *arg);
2784 
2785 #else /* !CONFIG_FS_ENCRYPTION */
2786 static inline int ext4_fname_setup_filename(struct inode *dir,
2787 					    const struct qstr *iname,
2788 					    int lookup,
2789 					    struct ext4_filename *fname)
2790 {
2791 	fname->usr_fname = iname;
2792 	fname->disk_name.name = (unsigned char *) iname->name;
2793 	fname->disk_name.len = iname->len;
2794 
2795 	return ext4_fname_setup_ci_filename(dir, iname, fname);
2796 }
2797 
2798 static inline int ext4_fname_prepare_lookup(struct inode *dir,
2799 					    struct dentry *dentry,
2800 					    struct ext4_filename *fname)
2801 {
2802 	return ext4_fname_setup_filename(dir, &dentry->d_name, 1, fname);
2803 }
2804 
2805 static inline void ext4_fname_free_filename(struct ext4_filename *fname)
2806 {
2807 	ext4_fname_free_ci_filename(fname);
2808 }
2809 
2810 static inline int ext4_ioctl_get_encryption_pwsalt(struct file *filp,
2811 						   void __user *arg)
2812 {
2813 	return -EOPNOTSUPP;
2814 }
2815 #endif /* !CONFIG_FS_ENCRYPTION */
2816 
2817 /* dir.c */
2818 extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *,
2819 				  struct file *,
2820 				  struct ext4_dir_entry_2 *,
2821 				  struct buffer_head *, char *, int,
2822 				  unsigned int);
2823 #define ext4_check_dir_entry(dir, filp, de, bh, buf, size, offset) \
2824 	unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \
2825 				(de), (bh), (buf), (size), (offset)))
2826 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
2827 				__u32 minor_hash,
2828 				struct ext4_dir_entry_2 *dirent,
2829 				struct fscrypt_str *ent_name);
2830 extern void ext4_htree_free_dir_info(struct dir_private_info *p);
2831 extern int ext4_find_dest_de(struct inode *dir, struct inode *inode,
2832 			     struct buffer_head *bh,
2833 			     void *buf, int buf_size,
2834 			     struct ext4_filename *fname,
2835 			     struct ext4_dir_entry_2 **dest_de);
2836 void ext4_insert_dentry(struct inode *dir, struct inode *inode,
2837 			struct ext4_dir_entry_2 *de,
2838 			int buf_size,
2839 			struct ext4_filename *fname);
2840 static inline void ext4_update_dx_flag(struct inode *inode)
2841 {
2842 	if (!ext4_has_feature_dir_index(inode->i_sb) &&
2843 	    ext4_test_inode_flag(inode, EXT4_INODE_INDEX)) {
2844 		/* ext4_iget() should have caught this... */
2845 		WARN_ON_ONCE(ext4_has_feature_metadata_csum(inode->i_sb));
2846 		ext4_clear_inode_flag(inode, EXT4_INODE_INDEX);
2847 	}
2848 }
2849 static const unsigned char ext4_filetype_table[] = {
2850 	DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK
2851 };
2852 
2853 static inline  unsigned char get_dtype(struct super_block *sb, int filetype)
2854 {
2855 	if (!ext4_has_feature_filetype(sb) || filetype >= EXT4_FT_MAX)
2856 		return DT_UNKNOWN;
2857 
2858 	return ext4_filetype_table[filetype];
2859 }
2860 extern int ext4_check_all_de(struct inode *dir, struct buffer_head *bh,
2861 			     void *buf, int buf_size);
2862 
2863 /* fsync.c */
2864 extern int ext4_sync_file(struct file *, loff_t, loff_t, int);
2865 
2866 /* hash.c */
2867 extern int ext4fs_dirhash(const struct inode *dir, const char *name, int len,
2868 			  struct dx_hash_info *hinfo);
2869 
2870 /* ialloc.c */
2871 extern int ext4_mark_inode_used(struct super_block *sb, int ino);
2872 extern struct inode *__ext4_new_inode(struct mnt_idmap *, handle_t *,
2873 				      struct inode *, umode_t,
2874 				      const struct qstr *qstr, __u32 goal,
2875 				      uid_t *owner, __u32 i_flags,
2876 				      int handle_type, unsigned int line_no,
2877 				      int nblocks);
2878 
2879 #define ext4_new_inode(handle, dir, mode, qstr, goal, owner, i_flags)          \
2880 	__ext4_new_inode(&nop_mnt_idmap, (handle), (dir), (mode), (qstr),      \
2881 			 (goal), (owner), i_flags, 0, 0, 0)
2882 #define ext4_new_inode_start_handle(idmap, dir, mode, qstr, goal, owner, \
2883 				    type, nblocks)		    \
2884 	__ext4_new_inode((idmap), NULL, (dir), (mode), (qstr), (goal), (owner), \
2885 			 0, (type), __LINE__, (nblocks))
2886 
2887 
2888 extern void ext4_free_inode(handle_t *, struct inode *);
2889 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long);
2890 extern unsigned long ext4_count_free_inodes(struct super_block *);
2891 extern unsigned long ext4_count_dirs(struct super_block *);
2892 extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap);
2893 extern int ext4_init_inode_table(struct super_block *sb,
2894 				 ext4_group_t group, int barrier);
2895 extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate);
2896 
2897 /* fast_commit.c */
2898 int ext4_fc_info_show(struct seq_file *seq, void *v);
2899 void ext4_fc_init(struct super_block *sb, journal_t *journal);
2900 void ext4_fc_init_inode(struct inode *inode);
2901 void ext4_fc_track_range(handle_t *handle, struct inode *inode, ext4_lblk_t start,
2902 			 ext4_lblk_t end);
2903 void __ext4_fc_track_unlink(handle_t *handle, struct inode *inode,
2904 	struct dentry *dentry);
2905 void __ext4_fc_track_link(handle_t *handle, struct inode *inode,
2906 	struct dentry *dentry);
2907 void ext4_fc_track_unlink(handle_t *handle, struct dentry *dentry);
2908 void ext4_fc_track_link(handle_t *handle, struct dentry *dentry);
2909 void __ext4_fc_track_create(handle_t *handle, struct inode *inode,
2910 			    struct dentry *dentry);
2911 void ext4_fc_track_create(handle_t *handle, struct dentry *dentry);
2912 void ext4_fc_track_inode(handle_t *handle, struct inode *inode);
2913 void ext4_fc_mark_ineligible(struct super_block *sb, int reason, handle_t *handle);
2914 void ext4_fc_start_update(struct inode *inode);
2915 void ext4_fc_stop_update(struct inode *inode);
2916 void ext4_fc_del(struct inode *inode);
2917 bool ext4_fc_replay_check_excluded(struct super_block *sb, ext4_fsblk_t block);
2918 void ext4_fc_replay_cleanup(struct super_block *sb);
2919 int ext4_fc_commit(journal_t *journal, tid_t commit_tid);
2920 int __init ext4_fc_init_dentry_cache(void);
2921 void ext4_fc_destroy_dentry_cache(void);
2922 int ext4_fc_record_regions(struct super_block *sb, int ino,
2923 			   ext4_lblk_t lblk, ext4_fsblk_t pblk,
2924 			   int len, int replay);
2925 
2926 /* mballoc.c */
2927 extern const struct seq_operations ext4_mb_seq_groups_ops;
2928 extern const struct seq_operations ext4_mb_seq_structs_summary_ops;
2929 extern int ext4_seq_mb_stats_show(struct seq_file *seq, void *offset);
2930 extern int ext4_mb_init(struct super_block *);
2931 extern void ext4_mb_release(struct super_block *);
2932 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *,
2933 				struct ext4_allocation_request *, int *);
2934 extern void ext4_discard_preallocations(struct inode *);
2935 extern int __init ext4_init_mballoc(void);
2936 extern void ext4_exit_mballoc(void);
2937 extern ext4_group_t ext4_mb_prefetch(struct super_block *sb,
2938 				     ext4_group_t group,
2939 				     unsigned int nr, int *cnt);
2940 extern void ext4_mb_prefetch_fini(struct super_block *sb, ext4_group_t group,
2941 				  unsigned int nr);
2942 
2943 extern void ext4_free_blocks(handle_t *handle, struct inode *inode,
2944 			     struct buffer_head *bh, ext4_fsblk_t block,
2945 			     unsigned long count, int flags);
2946 extern int ext4_mb_alloc_groupinfo(struct super_block *sb,
2947 				   ext4_group_t ngroups);
2948 extern int ext4_mb_add_groupinfo(struct super_block *sb,
2949 		ext4_group_t i, struct ext4_group_desc *desc);
2950 extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb,
2951 				ext4_fsblk_t block, unsigned long count);
2952 extern int ext4_trim_fs(struct super_block *, struct fstrim_range *);
2953 extern void ext4_process_freed_data(struct super_block *sb, tid_t commit_tid);
2954 extern void ext4_mb_mark_bb(struct super_block *sb, ext4_fsblk_t block,
2955 			    int len, bool state);
2956 static inline bool ext4_mb_cr_expensive(enum criteria cr)
2957 {
2958 	return cr >= CR_GOAL_LEN_SLOW;
2959 }
2960 
2961 /* inode.c */
2962 void ext4_inode_csum_set(struct inode *inode, struct ext4_inode *raw,
2963 			 struct ext4_inode_info *ei);
2964 int ext4_inode_is_fast_symlink(struct inode *inode);
2965 struct buffer_head *ext4_getblk(handle_t *, struct inode *, ext4_lblk_t, int);
2966 struct buffer_head *ext4_bread(handle_t *, struct inode *, ext4_lblk_t, int);
2967 int ext4_bread_batch(struct inode *inode, ext4_lblk_t block, int bh_count,
2968 		     bool wait, struct buffer_head **bhs);
2969 int ext4_get_block_unwritten(struct inode *inode, sector_t iblock,
2970 			     struct buffer_head *bh_result, int create);
2971 int ext4_get_block(struct inode *inode, sector_t iblock,
2972 		   struct buffer_head *bh_result, int create);
2973 int ext4_da_get_block_prep(struct inode *inode, sector_t iblock,
2974 			   struct buffer_head *bh, int create);
2975 int ext4_walk_page_buffers(handle_t *handle,
2976 			   struct inode *inode,
2977 			   struct buffer_head *head,
2978 			   unsigned from,
2979 			   unsigned to,
2980 			   int *partial,
2981 			   int (*fn)(handle_t *handle, struct inode *inode,
2982 				     struct buffer_head *bh));
2983 int do_journal_get_write_access(handle_t *handle, struct inode *inode,
2984 				struct buffer_head *bh);
2985 #define FALL_BACK_TO_NONDELALLOC 1
2986 #define CONVERT_INLINE_DATA	 2
2987 
2988 typedef enum {
2989 	EXT4_IGET_NORMAL =	0,
2990 	EXT4_IGET_SPECIAL =	0x0001, /* OK to iget a system inode */
2991 	EXT4_IGET_HANDLE = 	0x0002,	/* Inode # is from a handle */
2992 	EXT4_IGET_BAD =		0x0004, /* Allow to iget a bad inode */
2993 	EXT4_IGET_EA_INODE =	0x0008	/* Inode should contain an EA value */
2994 } ext4_iget_flags;
2995 
2996 extern struct inode *__ext4_iget(struct super_block *sb, unsigned long ino,
2997 				 ext4_iget_flags flags, const char *function,
2998 				 unsigned int line);
2999 
3000 #define ext4_iget(sb, ino, flags) \
3001 	__ext4_iget((sb), (ino), (flags), __func__, __LINE__)
3002 
3003 extern int  ext4_write_inode(struct inode *, struct writeback_control *);
3004 extern int  ext4_setattr(struct mnt_idmap *, struct dentry *,
3005 			 struct iattr *);
3006 extern u32  ext4_dio_alignment(struct inode *inode);
3007 extern int  ext4_getattr(struct mnt_idmap *, const struct path *,
3008 			 struct kstat *, u32, unsigned int);
3009 extern void ext4_evict_inode(struct inode *);
3010 extern void ext4_clear_inode(struct inode *);
3011 extern int  ext4_file_getattr(struct mnt_idmap *, const struct path *,
3012 			      struct kstat *, u32, unsigned int);
3013 extern void ext4_dirty_inode(struct inode *, int);
3014 extern int ext4_change_inode_journal_flag(struct inode *, int);
3015 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
3016 extern int ext4_get_fc_inode_loc(struct super_block *sb, unsigned long ino,
3017 			  struct ext4_iloc *iloc);
3018 extern int ext4_inode_attach_jinode(struct inode *inode);
3019 extern int ext4_can_truncate(struct inode *inode);
3020 extern int ext4_truncate(struct inode *);
3021 extern int ext4_break_layouts(struct inode *);
3022 extern int ext4_punch_hole(struct file *file, loff_t offset, loff_t length);
3023 extern void ext4_set_inode_flags(struct inode *, bool init);
3024 extern int ext4_alloc_da_blocks(struct inode *inode);
3025 extern void ext4_set_aops(struct inode *inode);
3026 extern int ext4_writepage_trans_blocks(struct inode *);
3027 extern int ext4_normal_submit_inode_data_buffers(struct jbd2_inode *jinode);
3028 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks);
3029 extern int ext4_zero_partial_blocks(handle_t *handle, struct inode *inode,
3030 			     loff_t lstart, loff_t lend);
3031 extern vm_fault_t ext4_page_mkwrite(struct vm_fault *vmf);
3032 extern qsize_t *ext4_get_reserved_space(struct inode *inode);
3033 extern int ext4_get_projid(struct inode *inode, kprojid_t *projid);
3034 extern void ext4_da_release_space(struct inode *inode, int to_free);
3035 extern void ext4_da_update_reserve_space(struct inode *inode,
3036 					int used, int quota_claim);
3037 extern int ext4_issue_zeroout(struct inode *inode, ext4_lblk_t lblk,
3038 			      ext4_fsblk_t pblk, ext4_lblk_t len);
3039 
3040 /* indirect.c */
3041 extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode,
3042 				struct ext4_map_blocks *map, int flags);
3043 extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks);
3044 extern void ext4_ind_truncate(handle_t *, struct inode *inode);
3045 extern int ext4_ind_remove_space(handle_t *handle, struct inode *inode,
3046 				 ext4_lblk_t start, ext4_lblk_t end);
3047 
3048 /* ioctl.c */
3049 extern long ext4_ioctl(struct file *, unsigned int, unsigned long);
3050 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long);
3051 int ext4_fileattr_set(struct mnt_idmap *idmap,
3052 		      struct dentry *dentry, struct fileattr *fa);
3053 int ext4_fileattr_get(struct dentry *dentry, struct fileattr *fa);
3054 extern void ext4_reset_inode_seed(struct inode *inode);
3055 int ext4_update_overhead(struct super_block *sb, bool force);
3056 int ext4_force_shutdown(struct super_block *sb, u32 flags);
3057 
3058 /* migrate.c */
3059 extern int ext4_ext_migrate(struct inode *);
3060 extern int ext4_ind_migrate(struct inode *inode);
3061 
3062 /* namei.c */
3063 extern int ext4_init_new_dir(handle_t *handle, struct inode *dir,
3064 			     struct inode *inode);
3065 extern int ext4_dirblock_csum_verify(struct inode *inode,
3066 				     struct buffer_head *bh);
3067 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
3068 				__u32 start_minor_hash, __u32 *next_hash);
3069 extern int ext4_search_dir(struct buffer_head *bh,
3070 			   char *search_buf,
3071 			   int buf_size,
3072 			   struct inode *dir,
3073 			   struct ext4_filename *fname,
3074 			   unsigned int offset,
3075 			   struct ext4_dir_entry_2 **res_dir);
3076 extern int ext4_generic_delete_entry(struct inode *dir,
3077 				     struct ext4_dir_entry_2 *de_del,
3078 				     struct buffer_head *bh,
3079 				     void *entry_buf,
3080 				     int buf_size,
3081 				     int csum_size);
3082 extern bool ext4_empty_dir(struct inode *inode);
3083 
3084 /* resize.c */
3085 extern void ext4_kvfree_array_rcu(void *to_free);
3086 extern int ext4_group_add(struct super_block *sb,
3087 				struct ext4_new_group_data *input);
3088 extern int ext4_group_extend(struct super_block *sb,
3089 				struct ext4_super_block *es,
3090 				ext4_fsblk_t n_blocks_count);
3091 extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count);
3092 extern unsigned int ext4_list_backups(struct super_block *sb,
3093 				      unsigned int *three, unsigned int *five,
3094 				      unsigned int *seven);
3095 
3096 /* super.c */
3097 extern struct buffer_head *ext4_sb_bread(struct super_block *sb,
3098 					 sector_t block, blk_opf_t op_flags);
3099 extern struct buffer_head *ext4_sb_bread_unmovable(struct super_block *sb,
3100 						   sector_t block);
3101 extern void ext4_read_bh_nowait(struct buffer_head *bh, blk_opf_t op_flags,
3102 				bh_end_io_t *end_io);
3103 extern int ext4_read_bh(struct buffer_head *bh, blk_opf_t op_flags,
3104 			bh_end_io_t *end_io);
3105 extern int ext4_read_bh_lock(struct buffer_head *bh, blk_opf_t op_flags, bool wait);
3106 extern void ext4_sb_breadahead_unmovable(struct super_block *sb, sector_t block);
3107 extern int ext4_seq_options_show(struct seq_file *seq, void *offset);
3108 extern int ext4_calculate_overhead(struct super_block *sb);
3109 extern __le32 ext4_superblock_csum(struct super_block *sb,
3110 				   struct ext4_super_block *es);
3111 extern void ext4_superblock_csum_set(struct super_block *sb);
3112 extern int ext4_alloc_flex_bg_array(struct super_block *sb,
3113 				    ext4_group_t ngroup);
3114 extern const char *ext4_decode_error(struct super_block *sb, int errno,
3115 				     char nbuf[16]);
3116 extern void ext4_mark_group_bitmap_corrupted(struct super_block *sb,
3117 					     ext4_group_t block_group,
3118 					     unsigned int flags);
3119 extern unsigned int ext4_num_base_meta_blocks(struct super_block *sb,
3120 					      ext4_group_t block_group);
3121 
3122 extern __printf(7, 8)
3123 void __ext4_error(struct super_block *, const char *, unsigned int, bool,
3124 		  int, __u64, const char *, ...);
3125 extern __printf(6, 7)
3126 void __ext4_error_inode(struct inode *, const char *, unsigned int,
3127 			ext4_fsblk_t, int, const char *, ...);
3128 extern __printf(5, 6)
3129 void __ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t,
3130 		     const char *, ...);
3131 extern void __ext4_std_error(struct super_block *, const char *,
3132 			     unsigned int, int);
3133 extern __printf(4, 5)
3134 void __ext4_warning(struct super_block *, const char *, unsigned int,
3135 		    const char *, ...);
3136 extern __printf(4, 5)
3137 void __ext4_warning_inode(const struct inode *inode, const char *function,
3138 			  unsigned int line, const char *fmt, ...);
3139 extern __printf(3, 4)
3140 void __ext4_msg(struct super_block *, const char *, const char *, ...);
3141 extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp,
3142 			   const char *, unsigned int, const char *);
3143 extern __printf(7, 8)
3144 void __ext4_grp_locked_error(const char *, unsigned int,
3145 			     struct super_block *, ext4_group_t,
3146 			     unsigned long, ext4_fsblk_t,
3147 			     const char *, ...);
3148 
3149 #define EXT4_ERROR_INODE(inode, fmt, a...) \
3150 	ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a)
3151 
3152 #define EXT4_ERROR_INODE_ERR(inode, err, fmt, a...)			\
3153 	__ext4_error_inode((inode), __func__, __LINE__, 0, (err), (fmt), ## a)
3154 
3155 #define ext4_error_inode_block(inode, block, err, fmt, a...)		\
3156 	__ext4_error_inode((inode), __func__, __LINE__, (block), (err),	\
3157 			   (fmt), ## a)
3158 
3159 #define EXT4_ERROR_FILE(file, block, fmt, a...)				\
3160 	ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a)
3161 
3162 #define ext4_abort(sb, err, fmt, a...)					\
3163 	__ext4_error((sb), __func__, __LINE__, true, (err), 0, (fmt), ## a)
3164 
3165 #ifdef CONFIG_PRINTK
3166 
3167 #define ext4_error_inode(inode, func, line, block, fmt, ...)		\
3168 	__ext4_error_inode(inode, func, line, block, 0, fmt, ##__VA_ARGS__)
3169 #define ext4_error_inode_err(inode, func, line, block, err, fmt, ...)	\
3170 	__ext4_error_inode((inode), (func), (line), (block), 		\
3171 			   (err), (fmt), ##__VA_ARGS__)
3172 #define ext4_error_file(file, func, line, block, fmt, ...)		\
3173 	__ext4_error_file(file, func, line, block, fmt, ##__VA_ARGS__)
3174 #define ext4_error(sb, fmt, ...)					\
3175 	__ext4_error((sb), __func__, __LINE__, false, 0, 0, (fmt),	\
3176 		##__VA_ARGS__)
3177 #define ext4_error_err(sb, err, fmt, ...)				\
3178 	__ext4_error((sb), __func__, __LINE__, false, (err), 0, (fmt),	\
3179 		##__VA_ARGS__)
3180 #define ext4_warning(sb, fmt, ...)					\
3181 	__ext4_warning(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
3182 #define ext4_warning_inode(inode, fmt, ...)				\
3183 	__ext4_warning_inode(inode, __func__, __LINE__, fmt, ##__VA_ARGS__)
3184 #define ext4_msg(sb, level, fmt, ...)				\
3185 	__ext4_msg(sb, level, fmt, ##__VA_ARGS__)
3186 #define dump_mmp_msg(sb, mmp, msg)					\
3187 	__dump_mmp_msg(sb, mmp, __func__, __LINE__, msg)
3188 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...)		\
3189 	__ext4_grp_locked_error(__func__, __LINE__, sb, grp, ino, block, \
3190 				fmt, ##__VA_ARGS__)
3191 
3192 #else
3193 
3194 #define ext4_error_inode(inode, func, line, block, fmt, ...)		\
3195 do {									\
3196 	no_printk(fmt, ##__VA_ARGS__);					\
3197 	__ext4_error_inode(inode, "", 0, block, 0, " ");		\
3198 } while (0)
3199 #define ext4_error_inode_err(inode, func, line, block, err, fmt, ...)	\
3200 do {									\
3201 	no_printk(fmt, ##__VA_ARGS__);					\
3202 	__ext4_error_inode(inode, "", 0, block, err, " ");		\
3203 } while (0)
3204 #define ext4_error_file(file, func, line, block, fmt, ...)		\
3205 do {									\
3206 	no_printk(fmt, ##__VA_ARGS__);					\
3207 	__ext4_error_file(file, "", 0, block, " ");			\
3208 } while (0)
3209 #define ext4_error(sb, fmt, ...)					\
3210 do {									\
3211 	no_printk(fmt, ##__VA_ARGS__);					\
3212 	__ext4_error(sb, "", 0, false, 0, 0, " ");			\
3213 } while (0)
3214 #define ext4_error_err(sb, err, fmt, ...)				\
3215 do {									\
3216 	no_printk(fmt, ##__VA_ARGS__);					\
3217 	__ext4_error(sb, "", 0, false, err, 0, " ");			\
3218 } while (0)
3219 #define ext4_warning(sb, fmt, ...)					\
3220 do {									\
3221 	no_printk(fmt, ##__VA_ARGS__);					\
3222 	__ext4_warning(sb, "", 0, " ");					\
3223 } while (0)
3224 #define ext4_warning_inode(inode, fmt, ...)				\
3225 do {									\
3226 	no_printk(fmt, ##__VA_ARGS__);					\
3227 	__ext4_warning_inode(inode, "", 0, " ");			\
3228 } while (0)
3229 #define ext4_msg(sb, level, fmt, ...)					\
3230 do {									\
3231 	no_printk(fmt, ##__VA_ARGS__);					\
3232 	__ext4_msg(sb, "", " ");					\
3233 } while (0)
3234 #define dump_mmp_msg(sb, mmp, msg)					\
3235 	__dump_mmp_msg(sb, mmp, "", 0, "")
3236 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...)		\
3237 do {									\
3238 	no_printk(fmt, ##__VA_ARGS__);				\
3239 	__ext4_grp_locked_error("", 0, sb, grp, ino, block, " ");	\
3240 } while (0)
3241 
3242 #endif
3243 
3244 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
3245 				      struct ext4_group_desc *bg);
3246 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
3247 				      struct ext4_group_desc *bg);
3248 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
3249 				     struct ext4_group_desc *bg);
3250 extern __u32 ext4_free_group_clusters(struct super_block *sb,
3251 				      struct ext4_group_desc *bg);
3252 extern __u32 ext4_free_inodes_count(struct super_block *sb,
3253 				 struct ext4_group_desc *bg);
3254 extern __u32 ext4_used_dirs_count(struct super_block *sb,
3255 				struct ext4_group_desc *bg);
3256 extern __u32 ext4_itable_unused_count(struct super_block *sb,
3257 				   struct ext4_group_desc *bg);
3258 extern void ext4_block_bitmap_set(struct super_block *sb,
3259 				  struct ext4_group_desc *bg, ext4_fsblk_t blk);
3260 extern void ext4_inode_bitmap_set(struct super_block *sb,
3261 				  struct ext4_group_desc *bg, ext4_fsblk_t blk);
3262 extern void ext4_inode_table_set(struct super_block *sb,
3263 				 struct ext4_group_desc *bg, ext4_fsblk_t blk);
3264 extern void ext4_free_group_clusters_set(struct super_block *sb,
3265 					 struct ext4_group_desc *bg,
3266 					 __u32 count);
3267 extern void ext4_free_inodes_set(struct super_block *sb,
3268 				struct ext4_group_desc *bg, __u32 count);
3269 extern void ext4_used_dirs_set(struct super_block *sb,
3270 				struct ext4_group_desc *bg, __u32 count);
3271 extern void ext4_itable_unused_set(struct super_block *sb,
3272 				   struct ext4_group_desc *bg, __u32 count);
3273 extern int ext4_group_desc_csum_verify(struct super_block *sb, __u32 group,
3274 				       struct ext4_group_desc *gdp);
3275 extern void ext4_group_desc_csum_set(struct super_block *sb, __u32 group,
3276 				     struct ext4_group_desc *gdp);
3277 extern int ext4_register_li_request(struct super_block *sb,
3278 				    ext4_group_t first_not_zeroed);
3279 
3280 static inline int ext4_has_metadata_csum(struct super_block *sb)
3281 {
3282 	WARN_ON_ONCE(ext4_has_feature_metadata_csum(sb) &&
3283 		     !EXT4_SB(sb)->s_chksum_driver);
3284 
3285 	return ext4_has_feature_metadata_csum(sb) &&
3286 	       (EXT4_SB(sb)->s_chksum_driver != NULL);
3287 }
3288 
3289 static inline int ext4_has_group_desc_csum(struct super_block *sb)
3290 {
3291 	return ext4_has_feature_gdt_csum(sb) || ext4_has_metadata_csum(sb);
3292 }
3293 
3294 #define ext4_read_incompat_64bit_val(es, name) \
3295 	(((es)->s_feature_incompat & cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT) \
3296 		? (ext4_fsblk_t)le32_to_cpu(es->name##_hi) << 32 : 0) | \
3297 		le32_to_cpu(es->name##_lo))
3298 
3299 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
3300 {
3301 	return ext4_read_incompat_64bit_val(es, s_blocks_count);
3302 }
3303 
3304 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
3305 {
3306 	return ext4_read_incompat_64bit_val(es, s_r_blocks_count);
3307 }
3308 
3309 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
3310 {
3311 	return ext4_read_incompat_64bit_val(es, s_free_blocks_count);
3312 }
3313 
3314 static inline void ext4_blocks_count_set(struct ext4_super_block *es,
3315 					 ext4_fsblk_t blk)
3316 {
3317 	es->s_blocks_count_lo = cpu_to_le32((u32)blk);
3318 	es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
3319 }
3320 
3321 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
3322 					      ext4_fsblk_t blk)
3323 {
3324 	es->s_free_blocks_count_lo = cpu_to_le32((u32)blk);
3325 	es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
3326 }
3327 
3328 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
3329 					   ext4_fsblk_t blk)
3330 {
3331 	es->s_r_blocks_count_lo = cpu_to_le32((u32)blk);
3332 	es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
3333 }
3334 
3335 static inline loff_t ext4_isize(struct super_block *sb,
3336 				struct ext4_inode *raw_inode)
3337 {
3338 	if (ext4_has_feature_largedir(sb) ||
3339 	    S_ISREG(le16_to_cpu(raw_inode->i_mode)))
3340 		return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) |
3341 			le32_to_cpu(raw_inode->i_size_lo);
3342 
3343 	return (loff_t) le32_to_cpu(raw_inode->i_size_lo);
3344 }
3345 
3346 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size)
3347 {
3348 	raw_inode->i_size_lo = cpu_to_le32(i_size);
3349 	raw_inode->i_size_high = cpu_to_le32(i_size >> 32);
3350 }
3351 
3352 /*
3353  * Reading s_groups_count requires using smp_rmb() afterwards.  See
3354  * the locking protocol documented in the comments of ext4_group_add()
3355  * in resize.c
3356  */
3357 static inline ext4_group_t ext4_get_groups_count(struct super_block *sb)
3358 {
3359 	ext4_group_t	ngroups = EXT4_SB(sb)->s_groups_count;
3360 
3361 	smp_rmb();
3362 	return ngroups;
3363 }
3364 
3365 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi,
3366 					     ext4_group_t block_group)
3367 {
3368 	return block_group >> sbi->s_log_groups_per_flex;
3369 }
3370 
3371 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi)
3372 {
3373 	return 1 << sbi->s_log_groups_per_flex;
3374 }
3375 
3376 #define ext4_std_error(sb, errno)				\
3377 do {								\
3378 	if ((errno))						\
3379 		__ext4_std_error((sb), __func__, __LINE__, (errno));	\
3380 } while (0)
3381 
3382 #ifdef CONFIG_SMP
3383 /* Each CPU can accumulate percpu_counter_batch clusters in their local
3384  * counters. So we need to make sure we have free clusters more
3385  * than percpu_counter_batch  * nr_cpu_ids. Also add a window of 4 times.
3386  */
3387 #define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids))
3388 #else
3389 #define EXT4_FREECLUSTERS_WATERMARK 0
3390 #endif
3391 
3392 /* Update i_disksize. Requires i_rwsem to avoid races with truncate */
3393 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize)
3394 {
3395 	WARN_ON_ONCE(S_ISREG(inode->i_mode) &&
3396 		     !inode_is_locked(inode));
3397 	down_write(&EXT4_I(inode)->i_data_sem);
3398 	if (newsize > EXT4_I(inode)->i_disksize)
3399 		WRITE_ONCE(EXT4_I(inode)->i_disksize, newsize);
3400 	up_write(&EXT4_I(inode)->i_data_sem);
3401 }
3402 
3403 /* Update i_size, i_disksize. Requires i_rwsem to avoid races with truncate */
3404 static inline int ext4_update_inode_size(struct inode *inode, loff_t newsize)
3405 {
3406 	int changed = 0;
3407 
3408 	if (newsize > inode->i_size) {
3409 		i_size_write(inode, newsize);
3410 		changed = 1;
3411 	}
3412 	if (newsize > EXT4_I(inode)->i_disksize) {
3413 		ext4_update_i_disksize(inode, newsize);
3414 		changed |= 2;
3415 	}
3416 	return changed;
3417 }
3418 
3419 int ext4_update_disksize_before_punch(struct inode *inode, loff_t offset,
3420 				      loff_t len);
3421 
3422 struct ext4_group_info {
3423 	unsigned long   bb_state;
3424 #ifdef AGGRESSIVE_CHECK
3425 	unsigned long	bb_check_counter;
3426 #endif
3427 	struct rb_root  bb_free_root;
3428 	ext4_grpblk_t	bb_first_free;	/* first free block */
3429 	ext4_grpblk_t	bb_free;	/* total free blocks */
3430 	ext4_grpblk_t	bb_fragments;	/* nr of freespace fragments */
3431 	int		bb_avg_fragment_size_order;	/* order of average
3432 							   fragment in BG */
3433 	ext4_grpblk_t	bb_largest_free_order;/* order of largest frag in BG */
3434 	ext4_group_t	bb_group;	/* Group number */
3435 	struct          list_head bb_prealloc_list;
3436 #ifdef DOUBLE_CHECK
3437 	void            *bb_bitmap;
3438 #endif
3439 	struct rw_semaphore alloc_sem;
3440 	struct list_head bb_avg_fragment_size_node;
3441 	struct list_head bb_largest_free_order_node;
3442 	ext4_grpblk_t	bb_counters[];	/* Nr of free power-of-two-block
3443 					 * regions, index is order.
3444 					 * bb_counters[3] = 5 means
3445 					 * 5 free 8-block regions. */
3446 };
3447 
3448 #define EXT4_GROUP_INFO_NEED_INIT_BIT		0
3449 #define EXT4_GROUP_INFO_WAS_TRIMMED_BIT		1
3450 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT	2
3451 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT	3
3452 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT		\
3453 	(1 << EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT)
3454 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT		\
3455 	(1 << EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT)
3456 #define EXT4_GROUP_INFO_BBITMAP_READ_BIT	4
3457 
3458 #define EXT4_MB_GRP_NEED_INIT(grp)	\
3459 	(test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state)))
3460 #define EXT4_MB_GRP_BBITMAP_CORRUPT(grp)	\
3461 	(test_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &((grp)->bb_state)))
3462 #define EXT4_MB_GRP_IBITMAP_CORRUPT(grp)	\
3463 	(test_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &((grp)->bb_state)))
3464 
3465 #define EXT4_MB_GRP_WAS_TRIMMED(grp)	\
3466 	(test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
3467 #define EXT4_MB_GRP_SET_TRIMMED(grp)	\
3468 	(set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
3469 #define EXT4_MB_GRP_CLEAR_TRIMMED(grp)	\
3470 	(clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
3471 #define EXT4_MB_GRP_TEST_AND_SET_READ(grp)	\
3472 	(test_and_set_bit(EXT4_GROUP_INFO_BBITMAP_READ_BIT, &((grp)->bb_state)))
3473 
3474 #define EXT4_MAX_CONTENTION		8
3475 #define EXT4_CONTENTION_THRESHOLD	2
3476 
3477 static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb,
3478 					      ext4_group_t group)
3479 {
3480 	return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group);
3481 }
3482 
3483 /*
3484  * Returns true if the filesystem is busy enough that attempts to
3485  * access the block group locks has run into contention.
3486  */
3487 static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi)
3488 {
3489 	return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD);
3490 }
3491 
3492 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group)
3493 {
3494 	spinlock_t *lock = ext4_group_lock_ptr(sb, group);
3495 	if (spin_trylock(lock))
3496 		/*
3497 		 * We're able to grab the lock right away, so drop the
3498 		 * lock contention counter.
3499 		 */
3500 		atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0);
3501 	else {
3502 		/*
3503 		 * The lock is busy, so bump the contention counter,
3504 		 * and then wait on the spin lock.
3505 		 */
3506 		atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1,
3507 				  EXT4_MAX_CONTENTION);
3508 		spin_lock(lock);
3509 	}
3510 }
3511 
3512 static inline void ext4_unlock_group(struct super_block *sb,
3513 					ext4_group_t group)
3514 {
3515 	spin_unlock(ext4_group_lock_ptr(sb, group));
3516 }
3517 
3518 #ifdef CONFIG_QUOTA
3519 static inline bool ext4_quota_capable(struct super_block *sb)
3520 {
3521 	return (test_opt(sb, QUOTA) || ext4_has_feature_quota(sb));
3522 }
3523 
3524 static inline bool ext4_is_quota_journalled(struct super_block *sb)
3525 {
3526 	struct ext4_sb_info *sbi = EXT4_SB(sb);
3527 
3528 	return (ext4_has_feature_quota(sb) ||
3529 		sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]);
3530 }
3531 int ext4_enable_quotas(struct super_block *sb);
3532 #endif
3533 
3534 /*
3535  * Block validity checking
3536  */
3537 #define ext4_check_indirect_blockref(inode, bh)				\
3538 	ext4_check_blockref(__func__, __LINE__, inode,			\
3539 			    (__le32 *)(bh)->b_data,			\
3540 			    EXT4_ADDR_PER_BLOCK((inode)->i_sb))
3541 
3542 #define ext4_ind_check_inode(inode)					\
3543 	ext4_check_blockref(__func__, __LINE__, inode,			\
3544 			    EXT4_I(inode)->i_data,			\
3545 			    EXT4_NDIR_BLOCKS)
3546 
3547 /*
3548  * Inodes and files operations
3549  */
3550 
3551 /* dir.c */
3552 extern const struct file_operations ext4_dir_operations;
3553 
3554 /* file.c */
3555 extern const struct inode_operations ext4_file_inode_operations;
3556 extern const struct file_operations ext4_file_operations;
3557 extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin);
3558 
3559 /* inline.c */
3560 extern int ext4_get_max_inline_size(struct inode *inode);
3561 extern int ext4_find_inline_data_nolock(struct inode *inode);
3562 extern int ext4_destroy_inline_data(handle_t *handle, struct inode *inode);
3563 
3564 int ext4_readpage_inline(struct inode *inode, struct folio *folio);
3565 extern int ext4_try_to_write_inline_data(struct address_space *mapping,
3566 					 struct inode *inode,
3567 					 loff_t pos, unsigned len,
3568 					 struct folio **foliop);
3569 int ext4_write_inline_data_end(struct inode *inode, loff_t pos, unsigned len,
3570 			       unsigned copied, struct folio *folio);
3571 extern int ext4_da_write_inline_data_begin(struct address_space *mapping,
3572 					   struct inode *inode,
3573 					   loff_t pos, unsigned len,
3574 					   struct folio **foliop,
3575 					   void **fsdata);
3576 extern int ext4_try_add_inline_entry(handle_t *handle,
3577 				     struct ext4_filename *fname,
3578 				     struct inode *dir, struct inode *inode);
3579 extern int ext4_try_create_inline_dir(handle_t *handle,
3580 				      struct inode *parent,
3581 				      struct inode *inode);
3582 extern int ext4_read_inline_dir(struct file *filp,
3583 				struct dir_context *ctx,
3584 				int *has_inline_data);
3585 extern int ext4_inlinedir_to_tree(struct file *dir_file,
3586 				  struct inode *dir, ext4_lblk_t block,
3587 				  struct dx_hash_info *hinfo,
3588 				  __u32 start_hash, __u32 start_minor_hash,
3589 				  int *has_inline_data);
3590 extern struct buffer_head *ext4_find_inline_entry(struct inode *dir,
3591 					struct ext4_filename *fname,
3592 					struct ext4_dir_entry_2 **res_dir,
3593 					int *has_inline_data);
3594 extern int ext4_delete_inline_entry(handle_t *handle,
3595 				    struct inode *dir,
3596 				    struct ext4_dir_entry_2 *de_del,
3597 				    struct buffer_head *bh,
3598 				    int *has_inline_data);
3599 extern bool empty_inline_dir(struct inode *dir, int *has_inline_data);
3600 extern struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
3601 					struct ext4_dir_entry_2 **parent_de,
3602 					int *retval);
3603 extern void *ext4_read_inline_link(struct inode *inode);
3604 
3605 struct iomap;
3606 extern int ext4_inline_data_iomap(struct inode *inode, struct iomap *iomap);
3607 
3608 extern int ext4_inline_data_truncate(struct inode *inode, int *has_inline);
3609 
3610 extern int ext4_convert_inline_data(struct inode *inode);
3611 
3612 static inline int ext4_has_inline_data(struct inode *inode)
3613 {
3614 	return ext4_test_inode_flag(inode, EXT4_INODE_INLINE_DATA) &&
3615 	       EXT4_I(inode)->i_inline_off;
3616 }
3617 
3618 /* namei.c */
3619 extern const struct inode_operations ext4_dir_inode_operations;
3620 extern const struct inode_operations ext4_special_inode_operations;
3621 extern struct dentry *ext4_get_parent(struct dentry *child);
3622 extern struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode,
3623 				 struct ext4_dir_entry_2 *de,
3624 				 int blocksize, int csum_size,
3625 				 unsigned int parent_ino, int dotdot_real_len);
3626 extern void ext4_initialize_dirent_tail(struct buffer_head *bh,
3627 					unsigned int blocksize);
3628 extern int ext4_handle_dirty_dirblock(handle_t *handle, struct inode *inode,
3629 				      struct buffer_head *bh);
3630 extern int __ext4_unlink(struct inode *dir, const struct qstr *d_name,
3631 			 struct inode *inode, struct dentry *dentry);
3632 extern int __ext4_link(struct inode *dir, struct inode *inode,
3633 		       struct dentry *dentry);
3634 
3635 #define S_SHIFT 12
3636 static const unsigned char ext4_type_by_mode[(S_IFMT >> S_SHIFT) + 1] = {
3637 	[S_IFREG >> S_SHIFT]	= EXT4_FT_REG_FILE,
3638 	[S_IFDIR >> S_SHIFT]	= EXT4_FT_DIR,
3639 	[S_IFCHR >> S_SHIFT]	= EXT4_FT_CHRDEV,
3640 	[S_IFBLK >> S_SHIFT]	= EXT4_FT_BLKDEV,
3641 	[S_IFIFO >> S_SHIFT]	= EXT4_FT_FIFO,
3642 	[S_IFSOCK >> S_SHIFT]	= EXT4_FT_SOCK,
3643 	[S_IFLNK >> S_SHIFT]	= EXT4_FT_SYMLINK,
3644 };
3645 
3646 static inline void ext4_set_de_type(struct super_block *sb,
3647 				struct ext4_dir_entry_2 *de,
3648 				umode_t mode) {
3649 	if (ext4_has_feature_filetype(sb))
3650 		de->file_type = ext4_type_by_mode[(mode & S_IFMT)>>S_SHIFT];
3651 }
3652 
3653 /* readpages.c */
3654 extern int ext4_mpage_readpages(struct inode *inode,
3655 		struct readahead_control *rac, struct folio *folio);
3656 extern int __init ext4_init_post_read_processing(void);
3657 extern void ext4_exit_post_read_processing(void);
3658 
3659 /* symlink.c */
3660 extern const struct inode_operations ext4_encrypted_symlink_inode_operations;
3661 extern const struct inode_operations ext4_symlink_inode_operations;
3662 extern const struct inode_operations ext4_fast_symlink_inode_operations;
3663 
3664 /* sysfs.c */
3665 extern void ext4_notify_error_sysfs(struct ext4_sb_info *sbi);
3666 extern int ext4_register_sysfs(struct super_block *sb);
3667 extern void ext4_unregister_sysfs(struct super_block *sb);
3668 extern int __init ext4_init_sysfs(void);
3669 extern void ext4_exit_sysfs(void);
3670 
3671 /* block_validity */
3672 extern void ext4_release_system_zone(struct super_block *sb);
3673 extern int ext4_setup_system_zone(struct super_block *sb);
3674 extern int __init ext4_init_system_zone(void);
3675 extern void ext4_exit_system_zone(void);
3676 extern int ext4_inode_block_valid(struct inode *inode,
3677 				  ext4_fsblk_t start_blk,
3678 				  unsigned int count);
3679 extern int ext4_check_blockref(const char *, unsigned int,
3680 			       struct inode *, __le32 *, unsigned int);
3681 extern int ext4_sb_block_valid(struct super_block *sb, struct inode *inode,
3682 				ext4_fsblk_t start_blk, unsigned int count);
3683 
3684 
3685 /* extents.c */
3686 struct ext4_ext_path;
3687 struct ext4_extent;
3688 
3689 /*
3690  * Maximum number of logical blocks in a file; ext4_extent's ee_block is
3691  * __le32.
3692  */
3693 #define EXT_MAX_BLOCKS	0xffffffff
3694 
3695 extern void ext4_ext_tree_init(handle_t *handle, struct inode *inode);
3696 extern int ext4_ext_index_trans_blocks(struct inode *inode, int extents);
3697 extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
3698 			       struct ext4_map_blocks *map, int flags);
3699 extern int ext4_ext_truncate(handle_t *, struct inode *);
3700 extern int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start,
3701 				 ext4_lblk_t end);
3702 extern void ext4_ext_init(struct super_block *);
3703 extern void ext4_ext_release(struct super_block *);
3704 extern long ext4_fallocate(struct file *file, int mode, loff_t offset,
3705 			  loff_t len);
3706 extern int ext4_convert_unwritten_extents(handle_t *handle, struct inode *inode,
3707 					  loff_t offset, ssize_t len);
3708 extern int ext4_convert_unwritten_io_end_vec(handle_t *handle,
3709 					     ext4_io_end_t *io_end);
3710 extern int ext4_map_blocks(handle_t *handle, struct inode *inode,
3711 			   struct ext4_map_blocks *map, int flags);
3712 extern int ext4_ext_calc_credits_for_single_extent(struct inode *inode,
3713 						   int num,
3714 						   struct ext4_ext_path *path);
3715 extern int ext4_ext_insert_extent(handle_t *, struct inode *,
3716 				  struct ext4_ext_path **,
3717 				  struct ext4_extent *, int);
3718 extern struct ext4_ext_path *ext4_find_extent(struct inode *, ext4_lblk_t,
3719 					      struct ext4_ext_path **,
3720 					      int flags);
3721 extern void ext4_free_ext_path(struct ext4_ext_path *);
3722 extern int ext4_ext_check_inode(struct inode *inode);
3723 extern ext4_lblk_t ext4_ext_next_allocated_block(struct ext4_ext_path *path);
3724 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
3725 			__u64 start, __u64 len);
3726 extern int ext4_get_es_cache(struct inode *inode,
3727 			     struct fiemap_extent_info *fieinfo,
3728 			     __u64 start, __u64 len);
3729 extern int ext4_ext_precache(struct inode *inode);
3730 extern int ext4_swap_extents(handle_t *handle, struct inode *inode1,
3731 				struct inode *inode2, ext4_lblk_t lblk1,
3732 			     ext4_lblk_t lblk2,  ext4_lblk_t count,
3733 			     int mark_unwritten,int *err);
3734 extern int ext4_clu_mapped(struct inode *inode, ext4_lblk_t lclu);
3735 extern int ext4_datasem_ensure_credits(handle_t *handle, struct inode *inode,
3736 				       int check_cred, int restart_cred,
3737 				       int revoke_cred);
3738 extern void ext4_ext_replay_shrink_inode(struct inode *inode, ext4_lblk_t end);
3739 extern int ext4_ext_replay_set_iblocks(struct inode *inode);
3740 extern int ext4_ext_replay_update_ex(struct inode *inode, ext4_lblk_t start,
3741 		int len, int unwritten, ext4_fsblk_t pblk);
3742 extern int ext4_ext_clear_bb(struct inode *inode);
3743 
3744 
3745 /* move_extent.c */
3746 extern void ext4_double_down_write_data_sem(struct inode *first,
3747 					    struct inode *second);
3748 extern void ext4_double_up_write_data_sem(struct inode *orig_inode,
3749 					  struct inode *donor_inode);
3750 extern int ext4_move_extents(struct file *o_filp, struct file *d_filp,
3751 			     __u64 start_orig, __u64 start_donor,
3752 			     __u64 len, __u64 *moved_len);
3753 
3754 /* page-io.c */
3755 extern int __init ext4_init_pageio(void);
3756 extern void ext4_exit_pageio(void);
3757 extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags);
3758 extern ext4_io_end_t *ext4_get_io_end(ext4_io_end_t *io_end);
3759 extern int ext4_put_io_end(ext4_io_end_t *io_end);
3760 extern void ext4_put_io_end_defer(ext4_io_end_t *io_end);
3761 extern void ext4_io_submit_init(struct ext4_io_submit *io,
3762 				struct writeback_control *wbc);
3763 extern void ext4_end_io_rsv_work(struct work_struct *work);
3764 extern void ext4_io_submit(struct ext4_io_submit *io);
3765 int ext4_bio_write_folio(struct ext4_io_submit *io, struct folio *page,
3766 		size_t len);
3767 extern struct ext4_io_end_vec *ext4_alloc_io_end_vec(ext4_io_end_t *io_end);
3768 extern struct ext4_io_end_vec *ext4_last_io_end_vec(ext4_io_end_t *io_end);
3769 
3770 /* mmp.c */
3771 extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t);
3772 
3773 /* mmp.c */
3774 extern void ext4_stop_mmpd(struct ext4_sb_info *sbi);
3775 
3776 /* verity.c */
3777 extern const struct fsverity_operations ext4_verityops;
3778 
3779 /* orphan.c */
3780 extern int ext4_orphan_add(handle_t *, struct inode *);
3781 extern int ext4_orphan_del(handle_t *, struct inode *);
3782 extern void ext4_orphan_cleanup(struct super_block *sb,
3783 				struct ext4_super_block *es);
3784 extern void ext4_release_orphan_info(struct super_block *sb);
3785 extern int ext4_init_orphan_info(struct super_block *sb);
3786 extern int ext4_orphan_file_empty(struct super_block *sb);
3787 extern void ext4_orphan_file_block_trigger(
3788 				struct jbd2_buffer_trigger_type *triggers,
3789 				struct buffer_head *bh,
3790 				void *data, size_t size);
3791 
3792 /*
3793  * Add new method to test whether block and inode bitmaps are properly
3794  * initialized. With uninit_bg reading the block from disk is not enough
3795  * to mark the bitmap uptodate. We need to also zero-out the bitmap
3796  */
3797 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart
3798 
3799 static inline int bitmap_uptodate(struct buffer_head *bh)
3800 {
3801 	return (buffer_uptodate(bh) &&
3802 			test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state));
3803 }
3804 static inline void set_bitmap_uptodate(struct buffer_head *bh)
3805 {
3806 	set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state);
3807 }
3808 
3809 /* For ioend & aio unwritten conversion wait queues */
3810 #define EXT4_WQ_HASH_SZ		37
3811 #define ext4_ioend_wq(v)   (&ext4__ioend_wq[((unsigned long)(v)) %\
3812 					    EXT4_WQ_HASH_SZ])
3813 extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
3814 
3815 extern int ext4_resize_begin(struct super_block *sb);
3816 extern int ext4_resize_end(struct super_block *sb, bool update_backups);
3817 
3818 static inline void ext4_set_io_unwritten_flag(struct inode *inode,
3819 					      struct ext4_io_end *io_end)
3820 {
3821 	if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) {
3822 		io_end->flag |= EXT4_IO_END_UNWRITTEN;
3823 		atomic_inc(&EXT4_I(inode)->i_unwritten);
3824 	}
3825 }
3826 
3827 static inline void ext4_clear_io_unwritten_flag(ext4_io_end_t *io_end)
3828 {
3829 	struct inode *inode = io_end->inode;
3830 
3831 	if (io_end->flag & EXT4_IO_END_UNWRITTEN) {
3832 		io_end->flag &= ~EXT4_IO_END_UNWRITTEN;
3833 		/* Wake up anyone waiting on unwritten extent conversion */
3834 		if (atomic_dec_and_test(&EXT4_I(inode)->i_unwritten))
3835 			wake_up_all(ext4_ioend_wq(inode));
3836 	}
3837 }
3838 
3839 extern const struct iomap_ops ext4_iomap_ops;
3840 extern const struct iomap_ops ext4_iomap_overwrite_ops;
3841 extern const struct iomap_ops ext4_iomap_report_ops;
3842 
3843 static inline int ext4_buffer_uptodate(struct buffer_head *bh)
3844 {
3845 	/*
3846 	 * If the buffer has the write error flag, we have failed
3847 	 * to write out data in the block.  In this  case, we don't
3848 	 * have to read the block because we may read the old data
3849 	 * successfully.
3850 	 */
3851 	if (buffer_write_io_error(bh))
3852 		set_buffer_uptodate(bh);
3853 	return buffer_uptodate(bh);
3854 }
3855 
3856 #endif	/* __KERNEL__ */
3857 
3858 #define EFSBADCRC	EBADMSG		/* Bad CRC detected */
3859 #define EFSCORRUPTED	EUCLEAN		/* Filesystem is corrupted */
3860 
3861 #endif	/* _EXT4_H */
3862