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 
44 #include <linux/fscrypt.h>
45 #include <linux/fsverity.h>
46 
47 #include <linux/compiler.h>
48 
49 /*
50  * The fourth extended filesystem constants/structures
51  */
52 
53 /*
54  * with AGGRESSIVE_CHECK allocator runs consistency checks over
55  * structures. these checks slow things down a lot
56  */
57 #define AGGRESSIVE_CHECK__
58 
59 /*
60  * with DOUBLE_CHECK defined mballoc creates persistent in-core
61  * bitmaps, maintains and uses them to check for double allocations
62  */
63 #define DOUBLE_CHECK__
64 
65 /*
66  * Define EXT4FS_DEBUG to produce debug messages
67  */
68 #undef EXT4FS_DEBUG
69 
70 /*
71  * Debug code
72  */
73 #ifdef EXT4FS_DEBUG
74 #define ext4_debug(f, a...)						\
75 	do {								\
76 		printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:",	\
77 			__FILE__, __LINE__, __func__);			\
78 		printk(KERN_DEBUG f, ## a);				\
79 	} while (0)
80 #else
81 #define ext4_debug(fmt, ...)	no_printk(fmt, ##__VA_ARGS__)
82 #endif
83 
84  /*
85   * Turn on EXT_DEBUG to enable ext4_ext_show_path/leaf/move in extents.c
86   */
87 #define EXT_DEBUG__
88 
89 /*
90  * Dynamic printk for controlled extents debugging.
91  */
92 #ifdef CONFIG_EXT4_DEBUG
93 #define ext_debug(ino, fmt, ...)					\
94 	pr_debug("[%s/%d] EXT4-fs (%s): ino %lu: (%s, %d): %s:" fmt,	\
95 		 current->comm, task_pid_nr(current),			\
96 		 ino->i_sb->s_id, ino->i_ino, __FILE__, __LINE__,	\
97 		 __func__, ##__VA_ARGS__)
98 #else
99 #define ext_debug(ino, fmt, ...)	no_printk(fmt, ##__VA_ARGS__)
100 #endif
101 
102 #define ASSERT(assert)						\
103 do {									\
104 	if (unlikely(!(assert))) {					\
105 		printk(KERN_EMERG					\
106 		       "Assertion failure in %s() at %s:%d: '%s'\n",	\
107 		       __func__, __FILE__, __LINE__, #assert);		\
108 		BUG();							\
109 	}								\
110 } while (0)
111 
112 /* data type for block offset of block group */
113 typedef int ext4_grpblk_t;
114 
115 /* data type for filesystem-wide blocks number */
116 typedef unsigned long long ext4_fsblk_t;
117 
118 /* data type for file logical block number */
119 typedef __u32 ext4_lblk_t;
120 
121 /* data type for block group number */
122 typedef unsigned int ext4_group_t;
123 
124 enum SHIFT_DIRECTION {
125 	SHIFT_LEFT = 0,
126 	SHIFT_RIGHT,
127 };
128 
129 /*
130  * Flags used in mballoc's allocation_context flags field.
131  *
132  * Also used to show what's going on for debugging purposes when the
133  * flag field is exported via the traceport interface
134  */
135 
136 /* prefer goal again. length */
137 #define EXT4_MB_HINT_MERGE		0x0001
138 /* blocks already reserved */
139 #define EXT4_MB_HINT_RESERVED		0x0002
140 /* metadata is being allocated */
141 #define EXT4_MB_HINT_METADATA		0x0004
142 /* first blocks in the file */
143 #define EXT4_MB_HINT_FIRST		0x0008
144 /* search for the best chunk */
145 #define EXT4_MB_HINT_BEST		0x0010
146 /* data is being allocated */
147 #define EXT4_MB_HINT_DATA		0x0020
148 /* don't preallocate (for tails) */
149 #define EXT4_MB_HINT_NOPREALLOC		0x0040
150 /* allocate for locality group */
151 #define EXT4_MB_HINT_GROUP_ALLOC	0x0080
152 /* allocate goal blocks or none */
153 #define EXT4_MB_HINT_GOAL_ONLY		0x0100
154 /* goal is meaningful */
155 #define EXT4_MB_HINT_TRY_GOAL		0x0200
156 /* blocks already pre-reserved by delayed allocation */
157 #define EXT4_MB_DELALLOC_RESERVED	0x0400
158 /* We are doing stream allocation */
159 #define EXT4_MB_STREAM_ALLOC		0x0800
160 /* Use reserved root blocks if needed */
161 #define EXT4_MB_USE_ROOT_BLOCKS		0x1000
162 /* Use blocks from reserved pool */
163 #define EXT4_MB_USE_RESERVED		0x2000
164 /* Do strict check for free blocks while retrying block allocation */
165 #define EXT4_MB_STRICT_CHECK		0x4000
166 /* Large fragment size list lookup succeeded at least once for cr = 0 */
167 #define EXT4_MB_CR0_OPTIMIZED		0x8000
168 /* Avg fragment size rb tree lookup succeeded at least once for cr = 1 */
169 #define EXT4_MB_CR1_OPTIMIZED		0x00010000
170 struct ext4_allocation_request {
171 	/* target inode for block we're allocating */
172 	struct inode *inode;
173 	/* how many blocks we want to allocate */
174 	unsigned int len;
175 	/* logical block in target inode */
176 	ext4_lblk_t logical;
177 	/* the closest logical allocated block to the left */
178 	ext4_lblk_t lleft;
179 	/* the closest logical allocated block to the right */
180 	ext4_lblk_t lright;
181 	/* phys. target (a hint) */
182 	ext4_fsblk_t goal;
183 	/* phys. block for the closest logical allocated block to the left */
184 	ext4_fsblk_t pleft;
185 	/* phys. block for the closest logical allocated block to the right */
186 	ext4_fsblk_t pright;
187 	/* flags. see above EXT4_MB_HINT_* */
188 	unsigned int flags;
189 };
190 
191 /*
192  * Logical to physical block mapping, used by ext4_map_blocks()
193  *
194  * This structure is used to pass requests into ext4_map_blocks() as
195  * well as to store the information returned by ext4_map_blocks().  It
196  * takes less room on the stack than a struct buffer_head.
197  */
198 #define EXT4_MAP_NEW		BIT(BH_New)
199 #define EXT4_MAP_MAPPED		BIT(BH_Mapped)
200 #define EXT4_MAP_UNWRITTEN	BIT(BH_Unwritten)
201 #define EXT4_MAP_BOUNDARY	BIT(BH_Boundary)
202 #define EXT4_MAP_FLAGS		(EXT4_MAP_NEW | EXT4_MAP_MAPPED |\
203 				 EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY)
204 
205 struct ext4_map_blocks {
206 	ext4_fsblk_t m_pblk;
207 	ext4_lblk_t m_lblk;
208 	unsigned int m_len;
209 	unsigned int m_flags;
210 };
211 
212 /*
213  * Block validity checking, system zone rbtree.
214  */
215 struct ext4_system_blocks {
216 	struct rb_root root;
217 	struct rcu_head rcu;
218 };
219 
220 /*
221  * Flags for ext4_io_end->flags
222  */
223 #define	EXT4_IO_END_UNWRITTEN	0x0001
224 
225 struct ext4_io_end_vec {
226 	struct list_head list;		/* list of io_end_vec */
227 	loff_t offset;			/* offset in the file */
228 	ssize_t size;			/* size of the extent */
229 };
230 
231 /*
232  * For converting unwritten extents on a work queue. 'handle' is used for
233  * buffered writeback.
234  */
235 typedef struct ext4_io_end {
236 	struct list_head	list;		/* per-file finished IO list */
237 	handle_t		*handle;	/* handle reserved for extent
238 						 * conversion */
239 	struct inode		*inode;		/* file being written to */
240 	struct bio		*bio;		/* Linked list of completed
241 						 * bios covering the extent */
242 	unsigned int		flag;		/* unwritten or not */
243 	refcount_t		count;		/* reference counter */
244 	struct list_head	list_vec;	/* list of ext4_io_end_vec */
245 } ext4_io_end_t;
246 
247 struct ext4_io_submit {
248 	struct writeback_control *io_wbc;
249 	struct bio		*io_bio;
250 	ext4_io_end_t		*io_end;
251 	sector_t		io_next_block;
252 };
253 
254 /*
255  * Special inodes numbers
256  */
257 #define	EXT4_BAD_INO		 1	/* Bad blocks inode */
258 #define EXT4_ROOT_INO		 2	/* Root inode */
259 #define EXT4_USR_QUOTA_INO	 3	/* User quota inode */
260 #define EXT4_GRP_QUOTA_INO	 4	/* Group quota inode */
261 #define EXT4_BOOT_LOADER_INO	 5	/* Boot loader inode */
262 #define EXT4_UNDEL_DIR_INO	 6	/* Undelete directory inode */
263 #define EXT4_RESIZE_INO		 7	/* Reserved group descriptors inode */
264 #define EXT4_JOURNAL_INO	 8	/* Journal inode */
265 
266 /* First non-reserved inode for old ext4 filesystems */
267 #define EXT4_GOOD_OLD_FIRST_INO	11
268 
269 /*
270  * Maximal count of links to a file
271  */
272 #define EXT4_LINK_MAX		65000
273 
274 /*
275  * Macro-instructions used to manage several block sizes
276  */
277 #define EXT4_MIN_BLOCK_SIZE		1024
278 #define	EXT4_MAX_BLOCK_SIZE		65536
279 #define EXT4_MIN_BLOCK_LOG_SIZE		10
280 #define EXT4_MAX_BLOCK_LOG_SIZE		16
281 #define EXT4_MAX_CLUSTER_LOG_SIZE	30
282 #ifdef __KERNEL__
283 # define EXT4_BLOCK_SIZE(s)		((s)->s_blocksize)
284 #else
285 # define EXT4_BLOCK_SIZE(s)		(EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
286 #endif
287 #define	EXT4_ADDR_PER_BLOCK(s)		(EXT4_BLOCK_SIZE(s) / sizeof(__u32))
288 #define EXT4_CLUSTER_SIZE(s)		(EXT4_BLOCK_SIZE(s) << \
289 					 EXT4_SB(s)->s_cluster_bits)
290 #ifdef __KERNEL__
291 # define EXT4_BLOCK_SIZE_BITS(s)	((s)->s_blocksize_bits)
292 # define EXT4_CLUSTER_BITS(s)		(EXT4_SB(s)->s_cluster_bits)
293 #else
294 # define EXT4_BLOCK_SIZE_BITS(s)	((s)->s_log_block_size + 10)
295 #endif
296 #ifdef __KERNEL__
297 #define	EXT4_ADDR_PER_BLOCK_BITS(s)	(EXT4_SB(s)->s_addr_per_block_bits)
298 #define EXT4_INODE_SIZE(s)		(EXT4_SB(s)->s_inode_size)
299 #define EXT4_FIRST_INO(s)		(EXT4_SB(s)->s_first_ino)
300 #else
301 #define EXT4_INODE_SIZE(s)	(((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
302 				 EXT4_GOOD_OLD_INODE_SIZE : \
303 				 (s)->s_inode_size)
304 #define EXT4_FIRST_INO(s)	(((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
305 				 EXT4_GOOD_OLD_FIRST_INO : \
306 				 (s)->s_first_ino)
307 #endif
308 #define EXT4_BLOCK_ALIGN(size, blkbits)		ALIGN((size), (1 << (blkbits)))
309 #define EXT4_MAX_BLOCKS(size, offset, blkbits) \
310 	((EXT4_BLOCK_ALIGN(size + offset, blkbits) >> blkbits) - (offset >> \
311 								  blkbits))
312 
313 /* Translate a block number to a cluster number */
314 #define EXT4_B2C(sbi, blk)	((blk) >> (sbi)->s_cluster_bits)
315 /* Translate a cluster number to a block number */
316 #define EXT4_C2B(sbi, cluster)	((cluster) << (sbi)->s_cluster_bits)
317 /* Translate # of blks to # of clusters */
318 #define EXT4_NUM_B2C(sbi, blks)	(((blks) + (sbi)->s_cluster_ratio - 1) >> \
319 				 (sbi)->s_cluster_bits)
320 /* Mask out the low bits to get the starting block of the cluster */
321 #define EXT4_PBLK_CMASK(s, pblk) ((pblk) &				\
322 				  ~((ext4_fsblk_t) (s)->s_cluster_ratio - 1))
323 #define EXT4_LBLK_CMASK(s, lblk) ((lblk) &				\
324 				  ~((ext4_lblk_t) (s)->s_cluster_ratio - 1))
325 /* Fill in the low bits to get the last block of the cluster */
326 #define EXT4_LBLK_CFILL(sbi, lblk) ((lblk) |				\
327 				    ((ext4_lblk_t) (sbi)->s_cluster_ratio - 1))
328 /* Get the cluster offset */
329 #define EXT4_PBLK_COFF(s, pblk) ((pblk) &				\
330 				 ((ext4_fsblk_t) (s)->s_cluster_ratio - 1))
331 #define EXT4_LBLK_COFF(s, lblk) ((lblk) &				\
332 				 ((ext4_lblk_t) (s)->s_cluster_ratio - 1))
333 
334 /*
335  * Structure of a blocks group descriptor
336  */
337 struct ext4_group_desc
338 {
339 	__le32	bg_block_bitmap_lo;	/* Blocks bitmap block */
340 	__le32	bg_inode_bitmap_lo;	/* Inodes bitmap block */
341 	__le32	bg_inode_table_lo;	/* Inodes table block */
342 	__le16	bg_free_blocks_count_lo;/* Free blocks count */
343 	__le16	bg_free_inodes_count_lo;/* Free inodes count */
344 	__le16	bg_used_dirs_count_lo;	/* Directories count */
345 	__le16	bg_flags;		/* EXT4_BG_flags (INODE_UNINIT, etc) */
346 	__le32  bg_exclude_bitmap_lo;   /* Exclude bitmap for snapshots */
347 	__le16  bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bbitmap) LE */
348 	__le16  bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+ibitmap) LE */
349 	__le16  bg_itable_unused_lo;	/* Unused inodes count */
350 	__le16  bg_checksum;		/* crc16(sb_uuid+group+desc) */
351 	__le32	bg_block_bitmap_hi;	/* Blocks bitmap block MSB */
352 	__le32	bg_inode_bitmap_hi;	/* Inodes bitmap block MSB */
353 	__le32	bg_inode_table_hi;	/* Inodes table block MSB */
354 	__le16	bg_free_blocks_count_hi;/* Free blocks count MSB */
355 	__le16	bg_free_inodes_count_hi;/* Free inodes count MSB */
356 	__le16	bg_used_dirs_count_hi;	/* Directories count MSB */
357 	__le16  bg_itable_unused_hi;    /* Unused inodes count MSB */
358 	__le32  bg_exclude_bitmap_hi;   /* Exclude bitmap block MSB */
359 	__le16  bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bbitmap) BE */
360 	__le16  bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+ibitmap) BE */
361 	__u32   bg_reserved;
362 };
363 
364 #define EXT4_BG_INODE_BITMAP_CSUM_HI_END	\
365 	(offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \
366 	 sizeof(__le16))
367 #define EXT4_BG_BLOCK_BITMAP_CSUM_HI_END	\
368 	(offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \
369 	 sizeof(__le16))
370 
371 /*
372  * Structure of a flex block group info
373  */
374 
375 struct flex_groups {
376 	atomic64_t	free_clusters;
377 	atomic_t	free_inodes;
378 	atomic_t	used_dirs;
379 };
380 
381 #define EXT4_BG_INODE_UNINIT	0x0001 /* Inode table/bitmap not in use */
382 #define EXT4_BG_BLOCK_UNINIT	0x0002 /* Block bitmap not in use */
383 #define EXT4_BG_INODE_ZEROED	0x0004 /* On-disk itable initialized to zero */
384 
385 /*
386  * Macro-instructions used to manage group descriptors
387  */
388 #define EXT4_MIN_DESC_SIZE		32
389 #define EXT4_MIN_DESC_SIZE_64BIT	64
390 #define	EXT4_MAX_DESC_SIZE		EXT4_MIN_BLOCK_SIZE
391 #define EXT4_DESC_SIZE(s)		(EXT4_SB(s)->s_desc_size)
392 #ifdef __KERNEL__
393 # define EXT4_BLOCKS_PER_GROUP(s)	(EXT4_SB(s)->s_blocks_per_group)
394 # define EXT4_CLUSTERS_PER_GROUP(s)	(EXT4_SB(s)->s_clusters_per_group)
395 # define EXT4_DESC_PER_BLOCK(s)		(EXT4_SB(s)->s_desc_per_block)
396 # define EXT4_INODES_PER_GROUP(s)	(EXT4_SB(s)->s_inodes_per_group)
397 # define EXT4_DESC_PER_BLOCK_BITS(s)	(EXT4_SB(s)->s_desc_per_block_bits)
398 #else
399 # define EXT4_BLOCKS_PER_GROUP(s)	((s)->s_blocks_per_group)
400 # define EXT4_DESC_PER_BLOCK(s)		(EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
401 # define EXT4_INODES_PER_GROUP(s)	((s)->s_inodes_per_group)
402 #endif
403 
404 /*
405  * Constants relative to the data blocks
406  */
407 #define	EXT4_NDIR_BLOCKS		12
408 #define	EXT4_IND_BLOCK			EXT4_NDIR_BLOCKS
409 #define	EXT4_DIND_BLOCK			(EXT4_IND_BLOCK + 1)
410 #define	EXT4_TIND_BLOCK			(EXT4_DIND_BLOCK + 1)
411 #define	EXT4_N_BLOCKS			(EXT4_TIND_BLOCK + 1)
412 
413 /*
414  * Inode flags
415  */
416 #define	EXT4_SECRM_FL			0x00000001 /* Secure deletion */
417 #define	EXT4_UNRM_FL			0x00000002 /* Undelete */
418 #define	EXT4_COMPR_FL			0x00000004 /* Compress file */
419 #define EXT4_SYNC_FL			0x00000008 /* Synchronous updates */
420 #define EXT4_IMMUTABLE_FL		0x00000010 /* Immutable file */
421 #define EXT4_APPEND_FL			0x00000020 /* writes to file may only append */
422 #define EXT4_NODUMP_FL			0x00000040 /* do not dump file */
423 #define EXT4_NOATIME_FL			0x00000080 /* do not update atime */
424 /* Reserved for compression usage... */
425 #define EXT4_DIRTY_FL			0x00000100
426 #define EXT4_COMPRBLK_FL		0x00000200 /* One or more compressed clusters */
427 #define EXT4_NOCOMPR_FL			0x00000400 /* Don't compress */
428 	/* nb: was previously EXT2_ECOMPR_FL */
429 #define EXT4_ENCRYPT_FL			0x00000800 /* encrypted file */
430 /* End compression flags --- maybe not all used */
431 #define EXT4_INDEX_FL			0x00001000 /* hash-indexed directory */
432 #define EXT4_IMAGIC_FL			0x00002000 /* AFS directory */
433 #define EXT4_JOURNAL_DATA_FL		0x00004000 /* file data should be journaled */
434 #define EXT4_NOTAIL_FL			0x00008000 /* file tail should not be merged */
435 #define EXT4_DIRSYNC_FL			0x00010000 /* dirsync behaviour (directories only) */
436 #define EXT4_TOPDIR_FL			0x00020000 /* Top of directory hierarchies*/
437 #define EXT4_HUGE_FILE_FL               0x00040000 /* Set to each huge file */
438 #define EXT4_EXTENTS_FL			0x00080000 /* Inode uses extents */
439 #define EXT4_VERITY_FL			0x00100000 /* Verity protected inode */
440 #define EXT4_EA_INODE_FL	        0x00200000 /* Inode used for large EA */
441 /* 0x00400000 was formerly EXT4_EOFBLOCKS_FL */
442 
443 #define EXT4_DAX_FL			0x02000000 /* Inode is DAX */
444 
445 #define EXT4_INLINE_DATA_FL		0x10000000 /* Inode has inline data. */
446 #define EXT4_PROJINHERIT_FL		0x20000000 /* Create with parents projid */
447 #define EXT4_CASEFOLD_FL		0x40000000 /* Casefolded directory */
448 #define EXT4_RESERVED_FL		0x80000000 /* reserved for ext4 lib */
449 
450 /* User modifiable flags */
451 #define EXT4_FL_USER_MODIFIABLE		(EXT4_SECRM_FL | \
452 					 EXT4_UNRM_FL | \
453 					 EXT4_COMPR_FL | \
454 					 EXT4_SYNC_FL | \
455 					 EXT4_IMMUTABLE_FL | \
456 					 EXT4_APPEND_FL | \
457 					 EXT4_NODUMP_FL | \
458 					 EXT4_NOATIME_FL | \
459 					 EXT4_JOURNAL_DATA_FL | \
460 					 EXT4_NOTAIL_FL | \
461 					 EXT4_DIRSYNC_FL | \
462 					 EXT4_TOPDIR_FL | \
463 					 EXT4_EXTENTS_FL | \
464 					 0x00400000 /* EXT4_EOFBLOCKS_FL */ | \
465 					 EXT4_DAX_FL | \
466 					 EXT4_PROJINHERIT_FL | \
467 					 EXT4_CASEFOLD_FL)
468 
469 /* User visible flags */
470 #define EXT4_FL_USER_VISIBLE		(EXT4_FL_USER_MODIFIABLE | \
471 					 EXT4_DIRTY_FL | \
472 					 EXT4_COMPRBLK_FL | \
473 					 EXT4_NOCOMPR_FL | \
474 					 EXT4_ENCRYPT_FL | \
475 					 EXT4_INDEX_FL | \
476 					 EXT4_VERITY_FL | \
477 					 EXT4_INLINE_DATA_FL)
478 
479 /* Flags that should be inherited by new inodes from their parent. */
480 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\
481 			   EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\
482 			   EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\
483 			   EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL |\
484 			   EXT4_PROJINHERIT_FL | EXT4_CASEFOLD_FL |\
485 			   EXT4_DAX_FL)
486 
487 /* Flags that are appropriate for regular files (all but dir-specific ones). */
488 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL | EXT4_CASEFOLD_FL |\
489 			   EXT4_PROJINHERIT_FL))
490 
491 /* Flags that are appropriate for non-directories/regular files. */
492 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL)
493 
494 /* The only flags that should be swapped */
495 #define EXT4_FL_SHOULD_SWAP (EXT4_HUGE_FILE_FL | EXT4_EXTENTS_FL)
496 
497 /* Flags which are mutually exclusive to DAX */
498 #define EXT4_DAX_MUT_EXCL (EXT4_VERITY_FL | EXT4_ENCRYPT_FL |\
499 			   EXT4_JOURNAL_DATA_FL | EXT4_INLINE_DATA_FL)
500 
501 /* Mask out flags that are inappropriate for the given type of inode. */
ext4_mask_flags(umode_t mode,__u32 flags)502 static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags)
503 {
504 	if (S_ISDIR(mode))
505 		return flags;
506 	else if (S_ISREG(mode))
507 		return flags & EXT4_REG_FLMASK;
508 	else
509 		return flags & EXT4_OTHER_FLMASK;
510 }
511 
512 /*
513  * Inode flags used for atomic set/get
514  */
515 enum {
516 	EXT4_INODE_SECRM	= 0,	/* Secure deletion */
517 	EXT4_INODE_UNRM		= 1,	/* Undelete */
518 	EXT4_INODE_COMPR	= 2,	/* Compress file */
519 	EXT4_INODE_SYNC		= 3,	/* Synchronous updates */
520 	EXT4_INODE_IMMUTABLE	= 4,	/* Immutable file */
521 	EXT4_INODE_APPEND	= 5,	/* writes to file may only append */
522 	EXT4_INODE_NODUMP	= 6,	/* do not dump file */
523 	EXT4_INODE_NOATIME	= 7,	/* do not update atime */
524 /* Reserved for compression usage... */
525 	EXT4_INODE_DIRTY	= 8,
526 	EXT4_INODE_COMPRBLK	= 9,	/* One or more compressed clusters */
527 	EXT4_INODE_NOCOMPR	= 10,	/* Don't compress */
528 	EXT4_INODE_ENCRYPT	= 11,	/* Encrypted file */
529 /* End compression flags --- maybe not all used */
530 	EXT4_INODE_INDEX	= 12,	/* hash-indexed directory */
531 	EXT4_INODE_IMAGIC	= 13,	/* AFS directory */
532 	EXT4_INODE_JOURNAL_DATA	= 14,	/* file data should be journaled */
533 	EXT4_INODE_NOTAIL	= 15,	/* file tail should not be merged */
534 	EXT4_INODE_DIRSYNC	= 16,	/* dirsync behaviour (directories only) */
535 	EXT4_INODE_TOPDIR	= 17,	/* Top of directory hierarchies*/
536 	EXT4_INODE_HUGE_FILE	= 18,	/* Set to each huge file */
537 	EXT4_INODE_EXTENTS	= 19,	/* Inode uses extents */
538 	EXT4_INODE_VERITY	= 20,	/* Verity protected inode */
539 	EXT4_INODE_EA_INODE	= 21,	/* Inode used for large EA */
540 /* 22 was formerly EXT4_INODE_EOFBLOCKS */
541 	EXT4_INODE_DAX		= 25,	/* Inode is DAX */
542 	EXT4_INODE_INLINE_DATA	= 28,	/* Data in inode. */
543 	EXT4_INODE_PROJINHERIT	= 29,	/* Create with parents projid */
544 	EXT4_INODE_CASEFOLD	= 30,	/* Casefolded directory */
545 	EXT4_INODE_RESERVED	= 31,	/* reserved for ext4 lib */
546 };
547 
548 /*
549  * Since it's pretty easy to mix up bit numbers and hex values, we use a
550  * build-time check to make sure that EXT4_XXX_FL is consistent with respect to
551  * EXT4_INODE_XXX. If all is well, the macros will be dropped, so, it won't cost
552  * any extra space in the compiled kernel image, otherwise, the build will fail.
553  * It's important that these values are the same, since we are using
554  * EXT4_INODE_XXX to test for flag values, but EXT4_XXX_FL must be consistent
555  * with the values of FS_XXX_FL defined in include/linux/fs.h and the on-disk
556  * values found in ext2, ext3 and ext4 filesystems, and of course the values
557  * defined in e2fsprogs.
558  *
559  * It's not paranoia if the Murphy's Law really *is* out to get you.  :-)
560  */
561 #define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1U << EXT4_INODE_##FLAG))
562 #define CHECK_FLAG_VALUE(FLAG) BUILD_BUG_ON(!TEST_FLAG_VALUE(FLAG))
563 
ext4_check_flag_values(void)564 static inline void ext4_check_flag_values(void)
565 {
566 	CHECK_FLAG_VALUE(SECRM);
567 	CHECK_FLAG_VALUE(UNRM);
568 	CHECK_FLAG_VALUE(COMPR);
569 	CHECK_FLAG_VALUE(SYNC);
570 	CHECK_FLAG_VALUE(IMMUTABLE);
571 	CHECK_FLAG_VALUE(APPEND);
572 	CHECK_FLAG_VALUE(NODUMP);
573 	CHECK_FLAG_VALUE(NOATIME);
574 	CHECK_FLAG_VALUE(DIRTY);
575 	CHECK_FLAG_VALUE(COMPRBLK);
576 	CHECK_FLAG_VALUE(NOCOMPR);
577 	CHECK_FLAG_VALUE(ENCRYPT);
578 	CHECK_FLAG_VALUE(INDEX);
579 	CHECK_FLAG_VALUE(IMAGIC);
580 	CHECK_FLAG_VALUE(JOURNAL_DATA);
581 	CHECK_FLAG_VALUE(NOTAIL);
582 	CHECK_FLAG_VALUE(DIRSYNC);
583 	CHECK_FLAG_VALUE(TOPDIR);
584 	CHECK_FLAG_VALUE(HUGE_FILE);
585 	CHECK_FLAG_VALUE(EXTENTS);
586 	CHECK_FLAG_VALUE(VERITY);
587 	CHECK_FLAG_VALUE(EA_INODE);
588 	CHECK_FLAG_VALUE(INLINE_DATA);
589 	CHECK_FLAG_VALUE(PROJINHERIT);
590 	CHECK_FLAG_VALUE(CASEFOLD);
591 	CHECK_FLAG_VALUE(RESERVED);
592 }
593 
594 /* Used to pass group descriptor data when online resize is done */
595 struct ext4_new_group_input {
596 	__u32 group;		/* Group number for this data */
597 	__u64 block_bitmap;	/* Absolute block number of block bitmap */
598 	__u64 inode_bitmap;	/* Absolute block number of inode bitmap */
599 	__u64 inode_table;	/* Absolute block number of inode table start */
600 	__u32 blocks_count;	/* Total number of blocks in this group */
601 	__u16 reserved_blocks;	/* Number of reserved blocks in this group */
602 	__u16 unused;
603 };
604 
605 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
606 struct compat_ext4_new_group_input {
607 	u32 group;
608 	compat_u64 block_bitmap;
609 	compat_u64 inode_bitmap;
610 	compat_u64 inode_table;
611 	u32 blocks_count;
612 	u16 reserved_blocks;
613 	u16 unused;
614 };
615 #endif
616 
617 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */
618 struct ext4_new_group_data {
619 	__u32 group;
620 	__u64 block_bitmap;
621 	__u64 inode_bitmap;
622 	__u64 inode_table;
623 	__u32 blocks_count;
624 	__u16 reserved_blocks;
625 	__u16 mdata_blocks;
626 	__u32 free_clusters_count;
627 };
628 
629 /* Indexes used to index group tables in ext4_new_group_data */
630 enum {
631 	BLOCK_BITMAP = 0,	/* block bitmap */
632 	INODE_BITMAP,		/* inode bitmap */
633 	INODE_TABLE,		/* inode tables */
634 	GROUP_TABLE_COUNT,
635 };
636 
637 /*
638  * Flags used by ext4_map_blocks()
639  */
640 	/* Allocate any needed blocks and/or convert an unwritten
641 	   extent to be an initialized ext4 */
642 #define EXT4_GET_BLOCKS_CREATE			0x0001
643 	/* Request the creation of an unwritten extent */
644 #define EXT4_GET_BLOCKS_UNWRIT_EXT		0x0002
645 #define EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT	(EXT4_GET_BLOCKS_UNWRIT_EXT|\
646 						 EXT4_GET_BLOCKS_CREATE)
647 	/* Caller is from the delayed allocation writeout path
648 	 * finally doing the actual allocation of delayed blocks */
649 #define EXT4_GET_BLOCKS_DELALLOC_RESERVE	0x0004
650 	/* caller is from the direct IO path, request to creation of an
651 	unwritten extents if not allocated, split the unwritten
652 	extent if blocks has been preallocated already*/
653 #define EXT4_GET_BLOCKS_PRE_IO			0x0008
654 #define EXT4_GET_BLOCKS_CONVERT			0x0010
655 #define EXT4_GET_BLOCKS_IO_CREATE_EXT		(EXT4_GET_BLOCKS_PRE_IO|\
656 					 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT)
657 	/* Convert extent to initialized after IO complete */
658 #define EXT4_GET_BLOCKS_IO_CONVERT_EXT		(EXT4_GET_BLOCKS_CONVERT|\
659 					 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT)
660 	/* Eventual metadata allocation (due to growing extent tree)
661 	 * should not fail, so try to use reserved blocks for that.*/
662 #define EXT4_GET_BLOCKS_METADATA_NOFAIL		0x0020
663 	/* Don't normalize allocation size (used for fallocate) */
664 #define EXT4_GET_BLOCKS_NO_NORMALIZE		0x0040
665 	/* Convert written extents to unwritten */
666 #define EXT4_GET_BLOCKS_CONVERT_UNWRITTEN	0x0100
667 	/* Write zeros to newly created written extents */
668 #define EXT4_GET_BLOCKS_ZERO			0x0200
669 #define EXT4_GET_BLOCKS_CREATE_ZERO		(EXT4_GET_BLOCKS_CREATE |\
670 					EXT4_GET_BLOCKS_ZERO)
671 	/* Caller will submit data before dropping transaction handle. This
672 	 * allows jbd2 to avoid submitting data before commit. */
673 #define EXT4_GET_BLOCKS_IO_SUBMIT		0x0400
674 	/* Caller is in the atomic contex, find extent if it has been cached */
675 #define EXT4_GET_BLOCKS_CACHED_NOWAIT		0x0800
676 
677 /*
678  * The bit position of these flags must not overlap with any of the
679  * EXT4_GET_BLOCKS_*.  They are used by ext4_find_extent(),
680  * read_extent_tree_block(), ext4_split_extent_at(),
681  * ext4_ext_insert_extent(), and ext4_ext_create_new_leaf().
682  * EXT4_EX_NOCACHE is used to indicate that the we shouldn't be
683  * caching the extents when reading from the extent tree while a
684  * truncate or punch hole operation is in progress.
685  */
686 #define EXT4_EX_NOCACHE				0x40000000
687 #define EXT4_EX_FORCE_CACHE			0x20000000
688 #define EXT4_EX_NOFAIL				0x10000000
689 
690 /*
691  * Flags used by ext4_free_blocks
692  */
693 #define EXT4_FREE_BLOCKS_METADATA		0x0001
694 #define EXT4_FREE_BLOCKS_FORGET			0x0002
695 #define EXT4_FREE_BLOCKS_VALIDATED		0x0004
696 #define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE		0x0008
697 #define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER	0x0010
698 #define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER	0x0020
699 #define EXT4_FREE_BLOCKS_RERESERVE_CLUSTER      0x0040
700 
701 /*
702  * ioctl commands
703  */
704 #define	EXT4_IOC_GETVERSION		_IOR('f', 3, long)
705 #define	EXT4_IOC_SETVERSION		_IOW('f', 4, long)
706 #define	EXT4_IOC_GETVERSION_OLD		FS_IOC_GETVERSION
707 #define	EXT4_IOC_SETVERSION_OLD		FS_IOC_SETVERSION
708 #define EXT4_IOC_GETRSVSZ		_IOR('f', 5, long)
709 #define EXT4_IOC_SETRSVSZ		_IOW('f', 6, long)
710 #define EXT4_IOC_GROUP_EXTEND		_IOW('f', 7, unsigned long)
711 #define EXT4_IOC_GROUP_ADD		_IOW('f', 8, struct ext4_new_group_input)
712 #define EXT4_IOC_MIGRATE		_IO('f', 9)
713  /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */
714  /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */
715 #define EXT4_IOC_ALLOC_DA_BLKS		_IO('f', 12)
716 #define EXT4_IOC_MOVE_EXT		_IOWR('f', 15, struct move_extent)
717 #define EXT4_IOC_RESIZE_FS		_IOW('f', 16, __u64)
718 #define EXT4_IOC_SWAP_BOOT		_IO('f', 17)
719 #define EXT4_IOC_PRECACHE_EXTENTS	_IO('f', 18)
720 /* ioctl codes 19--39 are reserved for fscrypt */
721 #define EXT4_IOC_CLEAR_ES_CACHE		_IO('f', 40)
722 #define EXT4_IOC_GETSTATE		_IOW('f', 41, __u32)
723 #define EXT4_IOC_GET_ES_CACHE		_IOWR('f', 42, struct fiemap)
724 #define EXT4_IOC_CHECKPOINT		_IOW('f', 43, __u32)
725 #define EXT4_IOC_GETFSUUID		_IOR('f', 44, struct fsuuid)
726 #define EXT4_IOC_SETFSUUID		_IOW('f', 44, struct fsuuid)
727 
728 #define EXT4_IOC_SHUTDOWN _IOR ('X', 125, __u32)
729 
730 /*
731  * Flags for going down operation
732  */
733 #define EXT4_GOING_FLAGS_DEFAULT		0x0	/* going down */
734 #define EXT4_GOING_FLAGS_LOGFLUSH		0x1	/* flush log but not data */
735 #define EXT4_GOING_FLAGS_NOLOGFLUSH		0x2	/* don't flush log nor data */
736 
737 /*
738  * Flags returned by EXT4_IOC_GETSTATE
739  *
740  * We only expose to userspace a subset of the state flags in
741  * i_state_flags
742  */
743 #define EXT4_STATE_FLAG_EXT_PRECACHED	0x00000001
744 #define EXT4_STATE_FLAG_NEW		0x00000002
745 #define EXT4_STATE_FLAG_NEWENTRY	0x00000004
746 #define EXT4_STATE_FLAG_DA_ALLOC_CLOSE	0x00000008
747 
748 /* flags for ioctl EXT4_IOC_CHECKPOINT */
749 #define EXT4_IOC_CHECKPOINT_FLAG_DISCARD	0x1
750 #define EXT4_IOC_CHECKPOINT_FLAG_ZEROOUT	0x2
751 #define EXT4_IOC_CHECKPOINT_FLAG_DRY_RUN	0x4
752 #define EXT4_IOC_CHECKPOINT_FLAG_VALID		(EXT4_IOC_CHECKPOINT_FLAG_DISCARD | \
753 						EXT4_IOC_CHECKPOINT_FLAG_ZEROOUT | \
754 						EXT4_IOC_CHECKPOINT_FLAG_DRY_RUN)
755 
756 /*
757  * Structure for EXT4_IOC_GETFSUUID/EXT4_IOC_SETFSUUID
758  */
759 struct fsuuid {
760 	__u32       fsu_len;
761 	__u32       fsu_flags;
762 	__u8        fsu_uuid[];
763 };
764 
765 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
766 /*
767  * ioctl commands in 32 bit emulation
768  */
769 #define EXT4_IOC32_GETVERSION		_IOR('f', 3, int)
770 #define EXT4_IOC32_SETVERSION		_IOW('f', 4, int)
771 #define EXT4_IOC32_GETRSVSZ		_IOR('f', 5, int)
772 #define EXT4_IOC32_SETRSVSZ		_IOW('f', 6, int)
773 #define EXT4_IOC32_GROUP_EXTEND		_IOW('f', 7, unsigned int)
774 #define EXT4_IOC32_GROUP_ADD		_IOW('f', 8, struct compat_ext4_new_group_input)
775 #define EXT4_IOC32_GETVERSION_OLD	FS_IOC32_GETVERSION
776 #define EXT4_IOC32_SETVERSION_OLD	FS_IOC32_SETVERSION
777 #endif
778 
779 /*
780  * Returned by EXT4_IOC_GET_ES_CACHE as an additional possible flag.
781  * It indicates that the entry in extent status cache is for a hole.
782  */
783 #define EXT4_FIEMAP_EXTENT_HOLE		0x08000000
784 
785 /* Max physical block we can address w/o extents */
786 #define EXT4_MAX_BLOCK_FILE_PHYS	0xFFFFFFFF
787 
788 /* Max logical block we can support */
789 #define EXT4_MAX_LOGICAL_BLOCK		0xFFFFFFFE
790 
791 /*
792  * Structure of an inode on the disk
793  */
794 struct ext4_inode {
795 	__le16	i_mode;		/* File mode */
796 	__le16	i_uid;		/* Low 16 bits of Owner Uid */
797 	__le32	i_size_lo;	/* Size in bytes */
798 	__le32	i_atime;	/* Access time */
799 	__le32	i_ctime;	/* Inode Change time */
800 	__le32	i_mtime;	/* Modification time */
801 	__le32	i_dtime;	/* Deletion Time */
802 	__le16	i_gid;		/* Low 16 bits of Group Id */
803 	__le16	i_links_count;	/* Links count */
804 	__le32	i_blocks_lo;	/* Blocks count */
805 	__le32	i_flags;	/* File flags */
806 	union {
807 		struct {
808 			__le32  l_i_version;
809 		} linux1;
810 		struct {
811 			__u32  h_i_translator;
812 		} hurd1;
813 		struct {
814 			__u32  m_i_reserved1;
815 		} masix1;
816 	} osd1;				/* OS dependent 1 */
817 	__le32	i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
818 	__le32	i_generation;	/* File version (for NFS) */
819 	__le32	i_file_acl_lo;	/* File ACL */
820 	__le32	i_size_high;
821 	__le32	i_obso_faddr;	/* Obsoleted fragment address */
822 	union {
823 		struct {
824 			__le16	l_i_blocks_high; /* were l_i_reserved1 */
825 			__le16	l_i_file_acl_high;
826 			__le16	l_i_uid_high;	/* these 2 fields */
827 			__le16	l_i_gid_high;	/* were reserved2[0] */
828 			__le16	l_i_checksum_lo;/* crc32c(uuid+inum+inode) LE */
829 			__le16	l_i_reserved;
830 		} linux2;
831 		struct {
832 			__le16	h_i_reserved1;	/* Obsoleted fragment number/size which are removed in ext4 */
833 			__u16	h_i_mode_high;
834 			__u16	h_i_uid_high;
835 			__u16	h_i_gid_high;
836 			__u32	h_i_author;
837 		} hurd2;
838 		struct {
839 			__le16	h_i_reserved1;	/* Obsoleted fragment number/size which are removed in ext4 */
840 			__le16	m_i_file_acl_high;
841 			__u32	m_i_reserved2[2];
842 		} masix2;
843 	} osd2;				/* OS dependent 2 */
844 	__le16	i_extra_isize;
845 	__le16	i_checksum_hi;	/* crc32c(uuid+inum+inode) BE */
846 	__le32  i_ctime_extra;  /* extra Change time      (nsec << 2 | epoch) */
847 	__le32  i_mtime_extra;  /* extra Modification time(nsec << 2 | epoch) */
848 	__le32  i_atime_extra;  /* extra Access time      (nsec << 2 | epoch) */
849 	__le32  i_crtime;       /* File Creation time */
850 	__le32  i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */
851 	__le32  i_version_hi;	/* high 32 bits for 64-bit version */
852 	__le32	i_projid;	/* Project ID */
853 };
854 
855 struct move_extent {
856 	__u32 reserved;		/* should be zero */
857 	__u32 donor_fd;		/* donor file descriptor */
858 	__u64 orig_start;	/* logical start offset in block for orig */
859 	__u64 donor_start;	/* logical start offset in block for donor */
860 	__u64 len;		/* block length to be moved */
861 	__u64 moved_len;	/* moved block length */
862 };
863 
864 #define EXT4_EPOCH_BITS 2
865 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
866 #define EXT4_NSEC_MASK  (~0UL << EXT4_EPOCH_BITS)
867 
868 /*
869  * Extended fields will fit into an inode if the filesystem was formatted
870  * with large inodes (-I 256 or larger) and there are not currently any EAs
871  * consuming all of the available space. For new inodes we always reserve
872  * enough space for the kernel's known extended fields, but for inodes
873  * created with an old kernel this might not have been the case. None of
874  * the extended inode fields is critical for correct filesystem operation.
875  * This macro checks if a certain field fits in the inode. Note that
876  * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
877  */
878 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field)	\
879 	((offsetof(typeof(*ext4_inode), field) +	\
880 	  sizeof((ext4_inode)->field))			\
881 	<= (EXT4_GOOD_OLD_INODE_SIZE +			\
882 	    (einode)->i_extra_isize))			\
883 
884 /*
885  * We use an encoding that preserves the times for extra epoch "00":
886  *
887  * extra  msb of                         adjust for signed
888  * epoch  32-bit                         32-bit tv_sec to
889  * bits   time    decoded 64-bit tv_sec  64-bit tv_sec      valid time range
890  * 0 0    1    -0x80000000..-0x00000001  0x000000000 1901-12-13..1969-12-31
891  * 0 0    0    0x000000000..0x07fffffff  0x000000000 1970-01-01..2038-01-19
892  * 0 1    1    0x080000000..0x0ffffffff  0x100000000 2038-01-19..2106-02-07
893  * 0 1    0    0x100000000..0x17fffffff  0x100000000 2106-02-07..2174-02-25
894  * 1 0    1    0x180000000..0x1ffffffff  0x200000000 2174-02-25..2242-03-16
895  * 1 0    0    0x200000000..0x27fffffff  0x200000000 2242-03-16..2310-04-04
896  * 1 1    1    0x280000000..0x2ffffffff  0x300000000 2310-04-04..2378-04-22
897  * 1 1    0    0x300000000..0x37fffffff  0x300000000 2378-04-22..2446-05-10
898  *
899  * Note that previous versions of the kernel on 64-bit systems would
900  * incorrectly use extra epoch bits 1,1 for dates between 1901 and
901  * 1970.  e2fsck will correct this, assuming that it is run on the
902  * affected filesystem before 2242.
903  */
904 
ext4_encode_extra_time(struct timespec64 * time)905 static inline __le32 ext4_encode_extra_time(struct timespec64 *time)
906 {
907 	u32 extra =((time->tv_sec - (s32)time->tv_sec) >> 32) & EXT4_EPOCH_MASK;
908 	return cpu_to_le32(extra | (time->tv_nsec << EXT4_EPOCH_BITS));
909 }
910 
ext4_decode_extra_time(struct timespec64 * time,__le32 extra)911 static inline void ext4_decode_extra_time(struct timespec64 *time,
912 					  __le32 extra)
913 {
914 	if (unlikely(extra & cpu_to_le32(EXT4_EPOCH_MASK)))
915 		time->tv_sec += (u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) << 32;
916 	time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS;
917 }
918 
919 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode)				\
920 do {										\
921 	if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra))     {\
922 		(raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec);	\
923 		(raw_inode)->xtime ## _extra =					\
924 				ext4_encode_extra_time(&(inode)->xtime);	\
925 		}								\
926 	else	\
927 		(raw_inode)->xtime = cpu_to_le32(clamp_t(int32_t, (inode)->xtime.tv_sec, S32_MIN, S32_MAX));	\
928 } while (0)
929 
930 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode)			       \
931 do {									       \
932 	if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime))		       \
933 		(raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec);      \
934 	if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra))	       \
935 		(raw_inode)->xtime ## _extra =				       \
936 				ext4_encode_extra_time(&(einode)->xtime);      \
937 } while (0)
938 
939 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode)				\
940 do {										\
941 	(inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime);	\
942 	if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) {	\
943 		ext4_decode_extra_time(&(inode)->xtime,				\
944 				       raw_inode->xtime ## _extra);		\
945 		}								\
946 	else									\
947 		(inode)->xtime.tv_nsec = 0;					\
948 } while (0)
949 
950 
951 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode)			       \
952 do {									       \
953 	if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime))		       \
954 		(einode)->xtime.tv_sec = 				       \
955 			(signed)le32_to_cpu((raw_inode)->xtime);	       \
956 	else								       \
957 		(einode)->xtime.tv_sec = 0;				       \
958 	if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra))	       \
959 		ext4_decode_extra_time(&(einode)->xtime,		       \
960 				       raw_inode->xtime ## _extra);	       \
961 	else								       \
962 		(einode)->xtime.tv_nsec = 0;				       \
963 } while (0)
964 
965 #define i_disk_version osd1.linux1.l_i_version
966 
967 #if defined(__KERNEL__) || defined(__linux__)
968 #define i_reserved1	osd1.linux1.l_i_reserved1
969 #define i_file_acl_high	osd2.linux2.l_i_file_acl_high
970 #define i_blocks_high	osd2.linux2.l_i_blocks_high
971 #define i_uid_low	i_uid
972 #define i_gid_low	i_gid
973 #define i_uid_high	osd2.linux2.l_i_uid_high
974 #define i_gid_high	osd2.linux2.l_i_gid_high
975 #define i_checksum_lo	osd2.linux2.l_i_checksum_lo
976 
977 #elif defined(__GNU__)
978 
979 #define i_translator	osd1.hurd1.h_i_translator
980 #define i_uid_high	osd2.hurd2.h_i_uid_high
981 #define i_gid_high	osd2.hurd2.h_i_gid_high
982 #define i_author	osd2.hurd2.h_i_author
983 
984 #elif defined(__masix__)
985 
986 #define i_reserved1	osd1.masix1.m_i_reserved1
987 #define i_file_acl_high	osd2.masix2.m_i_file_acl_high
988 #define i_reserved2	osd2.masix2.m_i_reserved2
989 
990 #endif /* defined(__KERNEL__) || defined(__linux__) */
991 
992 #include "extents_status.h"
993 #include "fast_commit.h"
994 
995 /*
996  * Lock subclasses for i_data_sem in the ext4_inode_info structure.
997  *
998  * These are needed to avoid lockdep false positives when we need to
999  * allocate blocks to the quota inode during ext4_map_blocks(), while
1000  * holding i_data_sem for a normal (non-quota) inode.  Since we don't
1001  * do quota tracking for the quota inode, this avoids deadlock (as
1002  * well as infinite recursion, since it isn't turtles all the way
1003  * down...)
1004  *
1005  *  I_DATA_SEM_NORMAL - Used for most inodes
1006  *  I_DATA_SEM_OTHER  - Used by move_inode.c for the second normal inode
1007  *			  where the second inode has larger inode number
1008  *			  than the first
1009  *  I_DATA_SEM_QUOTA  - Used for quota inodes only
1010  */
1011 enum {
1012 	I_DATA_SEM_NORMAL = 0,
1013 	I_DATA_SEM_OTHER,
1014 	I_DATA_SEM_QUOTA,
1015 };
1016 
1017 
1018 /*
1019  * fourth extended file system inode data in memory
1020  */
1021 struct ext4_inode_info {
1022 	__le32	i_data[15];	/* unconverted */
1023 	__u32	i_dtime;
1024 	ext4_fsblk_t	i_file_acl;
1025 
1026 	/*
1027 	 * i_block_group is the number of the block group which contains
1028 	 * this file's inode.  Constant across the lifetime of the inode,
1029 	 * it is used for making block allocation decisions - we try to
1030 	 * place a file's data blocks near its inode block, and new inodes
1031 	 * near to their parent directory's inode.
1032 	 */
1033 	ext4_group_t	i_block_group;
1034 	ext4_lblk_t	i_dir_start_lookup;
1035 #if (BITS_PER_LONG < 64)
1036 	unsigned long	i_state_flags;		/* Dynamic state flags */
1037 #endif
1038 	unsigned long	i_flags;
1039 
1040 	/*
1041 	 * Extended attributes can be read independently of the main file
1042 	 * data. Taking i_rwsem even when reading would cause contention
1043 	 * between readers of EAs and writers of regular file data, so
1044 	 * instead we synchronize on xattr_sem when reading or changing
1045 	 * EAs.
1046 	 */
1047 	struct rw_semaphore xattr_sem;
1048 
1049 	/*
1050 	 * Inodes with EXT4_STATE_ORPHAN_FILE use i_orphan_idx. Otherwise
1051 	 * i_orphan is used.
1052 	 */
1053 	union {
1054 		struct list_head i_orphan;	/* unlinked but open inodes */
1055 		unsigned int i_orphan_idx;	/* Index in orphan file */
1056 	};
1057 
1058 	/* Fast commit related info */
1059 
1060 	/* For tracking dentry create updates */
1061 	struct list_head i_fc_dilist;
1062 	struct list_head i_fc_list;	/*
1063 					 * inodes that need fast commit
1064 					 * protected by sbi->s_fc_lock.
1065 					 */
1066 
1067 	/* Start of lblk range that needs to be committed in this fast commit */
1068 	ext4_lblk_t i_fc_lblk_start;
1069 
1070 	/* End of lblk range that needs to be committed in this fast commit */
1071 	ext4_lblk_t i_fc_lblk_len;
1072 
1073 	/* Number of ongoing updates on this inode */
1074 	atomic_t  i_fc_updates;
1075 
1076 	/* Fast commit wait queue for this inode */
1077 	wait_queue_head_t i_fc_wait;
1078 
1079 	/* Protect concurrent accesses on i_fc_lblk_start, i_fc_lblk_len */
1080 	struct mutex i_fc_lock;
1081 
1082 	/*
1083 	 * i_disksize keeps track of what the inode size is ON DISK, not
1084 	 * in memory.  During truncate, i_size is set to the new size by
1085 	 * the VFS prior to calling ext4_truncate(), but the filesystem won't
1086 	 * set i_disksize to 0 until the truncate is actually under way.
1087 	 *
1088 	 * The intent is that i_disksize always represents the blocks which
1089 	 * are used by this file.  This allows recovery to restart truncate
1090 	 * on orphans if we crash during truncate.  We actually write i_disksize
1091 	 * into the on-disk inode when writing inodes out, instead of i_size.
1092 	 *
1093 	 * The only time when i_disksize and i_size may be different is when
1094 	 * a truncate is in progress.  The only things which change i_disksize
1095 	 * are ext4_get_block (growth) and ext4_truncate (shrinkth).
1096 	 */
1097 	loff_t	i_disksize;
1098 
1099 	/*
1100 	 * i_data_sem is for serialising ext4_truncate() against
1101 	 * ext4_getblock().  In the 2.4 ext2 design, great chunks of inode's
1102 	 * data tree are chopped off during truncate. We can't do that in
1103 	 * ext4 because whenever we perform intermediate commits during
1104 	 * truncate, the inode and all the metadata blocks *must* be in a
1105 	 * consistent state which allows truncation of the orphans to restart
1106 	 * during recovery.  Hence we must fix the get_block-vs-truncate race
1107 	 * by other means, so we have i_data_sem.
1108 	 */
1109 	struct rw_semaphore i_data_sem;
1110 	struct inode vfs_inode;
1111 	struct jbd2_inode *jinode;
1112 
1113 	spinlock_t i_raw_lock;	/* protects updates to the raw inode */
1114 
1115 	/*
1116 	 * File creation time. Its function is same as that of
1117 	 * struct timespec64 i_{a,c,m}time in the generic inode.
1118 	 */
1119 	struct timespec64 i_crtime;
1120 
1121 	/* mballoc */
1122 	atomic_t i_prealloc_active;
1123 	struct list_head i_prealloc_list;
1124 	spinlock_t i_prealloc_lock;
1125 
1126 	/* extents status tree */
1127 	struct ext4_es_tree i_es_tree;
1128 	rwlock_t i_es_lock;
1129 	struct list_head i_es_list;
1130 	unsigned int i_es_all_nr;	/* protected by i_es_lock */
1131 	unsigned int i_es_shk_nr;	/* protected by i_es_lock */
1132 	ext4_lblk_t i_es_shrink_lblk;	/* Offset where we start searching for
1133 					   extents to shrink. Protected by
1134 					   i_es_lock  */
1135 
1136 	/* ialloc */
1137 	ext4_group_t	i_last_alloc_group;
1138 
1139 	/* allocation reservation info for delalloc */
1140 	/* In case of bigalloc, this refer to clusters rather than blocks */
1141 	unsigned int i_reserved_data_blocks;
1142 
1143 	/* pending cluster reservations for bigalloc file systems */
1144 	struct ext4_pending_tree i_pending_tree;
1145 
1146 	/* on-disk additional length */
1147 	__u16 i_extra_isize;
1148 
1149 	/* Indicate the inline data space. */
1150 	u16 i_inline_off;
1151 	u16 i_inline_size;
1152 
1153 #ifdef CONFIG_QUOTA
1154 	/* quota space reservation, managed internally by quota code */
1155 	qsize_t i_reserved_quota;
1156 #endif
1157 
1158 	/* Lock protecting lists below */
1159 	spinlock_t i_completed_io_lock;
1160 	/*
1161 	 * Completed IOs that need unwritten extents handling and have
1162 	 * transaction reserved
1163 	 */
1164 	struct list_head i_rsv_conversion_list;
1165 	struct work_struct i_rsv_conversion_work;
1166 	atomic_t i_unwritten; /* Nr. of inflight conversions pending */
1167 
1168 	spinlock_t i_block_reservation_lock;
1169 
1170 	/*
1171 	 * Transactions that contain inode's metadata needed to complete
1172 	 * fsync and fdatasync, respectively.
1173 	 */
1174 	tid_t i_sync_tid;
1175 	tid_t i_datasync_tid;
1176 
1177 #ifdef CONFIG_QUOTA
1178 	struct dquot *i_dquot[MAXQUOTAS];
1179 #endif
1180 
1181 	/* Precomputed uuid+inum+igen checksum for seeding inode checksums */
1182 	__u32 i_csum_seed;
1183 
1184 	kprojid_t i_projid;
1185 };
1186 
1187 /*
1188  * File system states
1189  */
1190 #define	EXT4_VALID_FS			0x0001	/* Unmounted cleanly */
1191 #define	EXT4_ERROR_FS			0x0002	/* Errors detected */
1192 #define	EXT4_ORPHAN_FS			0x0004	/* Orphans being recovered */
1193 #define EXT4_FC_REPLAY			0x0020	/* Fast commit replay ongoing */
1194 
1195 /*
1196  * Misc. filesystem flags
1197  */
1198 #define EXT2_FLAGS_SIGNED_HASH		0x0001  /* Signed dirhash in use */
1199 #define EXT2_FLAGS_UNSIGNED_HASH	0x0002  /* Unsigned dirhash in use */
1200 #define EXT2_FLAGS_TEST_FILESYS		0x0004	/* to test development code */
1201 
1202 /*
1203  * Mount flags set via mount options or defaults
1204  */
1205 #define EXT4_MOUNT_NO_MBCACHE		0x00001 /* Do not use mbcache */
1206 #define EXT4_MOUNT_GRPID		0x00004	/* Create files with directory's group */
1207 #define EXT4_MOUNT_DEBUG		0x00008	/* Some debugging messages */
1208 #define EXT4_MOUNT_ERRORS_CONT		0x00010	/* Continue on errors */
1209 #define EXT4_MOUNT_ERRORS_RO		0x00020	/* Remount fs ro on errors */
1210 #define EXT4_MOUNT_ERRORS_PANIC		0x00040	/* Panic on errors */
1211 #define EXT4_MOUNT_ERRORS_MASK		0x00070
1212 #define EXT4_MOUNT_MINIX_DF		0x00080	/* Mimics the Minix statfs */
1213 #define EXT4_MOUNT_NOLOAD		0x00100	/* Don't use existing journal*/
1214 #ifdef CONFIG_FS_DAX
1215 #define EXT4_MOUNT_DAX_ALWAYS		0x00200	/* Direct Access */
1216 #else
1217 #define EXT4_MOUNT_DAX_ALWAYS		0
1218 #endif
1219 #define EXT4_MOUNT_DATA_FLAGS		0x00C00	/* Mode for data writes: */
1220 #define EXT4_MOUNT_JOURNAL_DATA		0x00400	/* Write data to journal */
1221 #define EXT4_MOUNT_ORDERED_DATA		0x00800	/* Flush data before commit */
1222 #define EXT4_MOUNT_WRITEBACK_DATA	0x00C00	/* No data ordering */
1223 #define EXT4_MOUNT_UPDATE_JOURNAL	0x01000	/* Update the journal format */
1224 #define EXT4_MOUNT_NO_UID32		0x02000  /* Disable 32-bit UIDs */
1225 #define EXT4_MOUNT_XATTR_USER		0x04000	/* Extended user attributes */
1226 #define EXT4_MOUNT_POSIX_ACL		0x08000	/* POSIX Access Control Lists */
1227 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC	0x10000	/* No auto delalloc mapping */
1228 #define EXT4_MOUNT_BARRIER		0x20000 /* Use block barriers */
1229 #define EXT4_MOUNT_QUOTA		0x40000 /* Some quota option set */
1230 #define EXT4_MOUNT_USRQUOTA		0x80000 /* "old" user quota,
1231 						 * enable enforcement for hidden
1232 						 * quota files */
1233 #define EXT4_MOUNT_GRPQUOTA		0x100000 /* "old" group quota, enable
1234 						  * enforcement for hidden quota
1235 						  * files */
1236 #define EXT4_MOUNT_PRJQUOTA		0x200000 /* Enable project quota
1237 						  * enforcement */
1238 #define EXT4_MOUNT_DIOREAD_NOLOCK	0x400000 /* Enable support for dio read nolocking */
1239 #define EXT4_MOUNT_JOURNAL_CHECKSUM	0x800000 /* Journal checksums */
1240 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT	0x1000000 /* Journal Async Commit */
1241 #define EXT4_MOUNT_WARN_ON_ERROR	0x2000000 /* Trigger WARN_ON on error */
1242 #define EXT4_MOUNT_NO_PREFETCH_BLOCK_BITMAPS 0x4000000
1243 #define EXT4_MOUNT_DELALLOC		0x8000000 /* Delalloc support */
1244 #define EXT4_MOUNT_DATA_ERR_ABORT	0x10000000 /* Abort on file data write */
1245 #define EXT4_MOUNT_BLOCK_VALIDITY	0x20000000 /* Block validity checking */
1246 #define EXT4_MOUNT_DISCARD		0x40000000 /* Issue DISCARD requests */
1247 #define EXT4_MOUNT_INIT_INODE_TABLE	0x80000000 /* Initialize uninitialized itables */
1248 
1249 /*
1250  * Mount flags set either automatically (could not be set by mount option)
1251  * based on per file system feature or property or in special cases such as
1252  * distinguishing between explicit mount option definition and default.
1253  */
1254 #define EXT4_MOUNT2_EXPLICIT_DELALLOC	0x00000001 /* User explicitly
1255 						      specified delalloc */
1256 #define EXT4_MOUNT2_STD_GROUP_SIZE	0x00000002 /* We have standard group
1257 						      size of blocksize * 8
1258 						      blocks */
1259 #define EXT4_MOUNT2_HURD_COMPAT		0x00000004 /* Support HURD-castrated
1260 						      file systems */
1261 #define EXT4_MOUNT2_EXPLICIT_JOURNAL_CHECKSUM	0x00000008 /* User explicitly
1262 						specified journal checksum */
1263 
1264 #define EXT4_MOUNT2_JOURNAL_FAST_COMMIT	0x00000010 /* Journal fast commit */
1265 #define EXT4_MOUNT2_DAX_NEVER		0x00000020 /* Do not allow Direct Access */
1266 #define EXT4_MOUNT2_DAX_INODE		0x00000040 /* For printing options only */
1267 #define EXT4_MOUNT2_MB_OPTIMIZE_SCAN	0x00000080 /* Optimize group
1268 						    * scanning in mballoc
1269 						    */
1270 
1271 #define clear_opt(sb, opt)		EXT4_SB(sb)->s_mount_opt &= \
1272 						~EXT4_MOUNT_##opt
1273 #define set_opt(sb, opt)		EXT4_SB(sb)->s_mount_opt |= \
1274 						EXT4_MOUNT_##opt
1275 #define test_opt(sb, opt)		(EXT4_SB(sb)->s_mount_opt & \
1276 					 EXT4_MOUNT_##opt)
1277 
1278 #define clear_opt2(sb, opt)		EXT4_SB(sb)->s_mount_opt2 &= \
1279 						~EXT4_MOUNT2_##opt
1280 #define set_opt2(sb, opt)		EXT4_SB(sb)->s_mount_opt2 |= \
1281 						EXT4_MOUNT2_##opt
1282 #define test_opt2(sb, opt)		(EXT4_SB(sb)->s_mount_opt2 & \
1283 					 EXT4_MOUNT2_##opt)
1284 
1285 #define ext4_test_and_set_bit		__test_and_set_bit_le
1286 #define ext4_set_bit			__set_bit_le
1287 #define ext4_set_bit_atomic		ext2_set_bit_atomic
1288 #define ext4_test_and_clear_bit		__test_and_clear_bit_le
1289 #define ext4_clear_bit			__clear_bit_le
1290 #define ext4_clear_bit_atomic		ext2_clear_bit_atomic
1291 #define ext4_test_bit			test_bit_le
1292 #define ext4_find_next_zero_bit		find_next_zero_bit_le
1293 #define ext4_find_next_bit		find_next_bit_le
1294 
1295 extern void mb_set_bits(void *bm, int cur, int len);
1296 
1297 /*
1298  * Maximal mount counts between two filesystem checks
1299  */
1300 #define EXT4_DFL_MAX_MNT_COUNT		20	/* Allow 20 mounts */
1301 #define EXT4_DFL_CHECKINTERVAL		0	/* Don't use interval check */
1302 
1303 /*
1304  * Behaviour when detecting errors
1305  */
1306 #define EXT4_ERRORS_CONTINUE		1	/* Continue execution */
1307 #define EXT4_ERRORS_RO			2	/* Remount fs read-only */
1308 #define EXT4_ERRORS_PANIC		3	/* Panic */
1309 #define EXT4_ERRORS_DEFAULT		EXT4_ERRORS_CONTINUE
1310 
1311 /* Metadata checksum algorithm codes */
1312 #define EXT4_CRC32C_CHKSUM		1
1313 
1314 #define EXT4_LABEL_MAX			16
1315 
1316 /*
1317  * Structure of the super block
1318  */
1319 struct ext4_super_block {
1320 /*00*/	__le32	s_inodes_count;		/* Inodes count */
1321 	__le32	s_blocks_count_lo;	/* Blocks count */
1322 	__le32	s_r_blocks_count_lo;	/* Reserved blocks count */
1323 	__le32	s_free_blocks_count_lo;	/* Free blocks count */
1324 /*10*/	__le32	s_free_inodes_count;	/* Free inodes count */
1325 	__le32	s_first_data_block;	/* First Data Block */
1326 	__le32	s_log_block_size;	/* Block size */
1327 	__le32	s_log_cluster_size;	/* Allocation cluster size */
1328 /*20*/	__le32	s_blocks_per_group;	/* # Blocks per group */
1329 	__le32	s_clusters_per_group;	/* # Clusters per group */
1330 	__le32	s_inodes_per_group;	/* # Inodes per group */
1331 	__le32	s_mtime;		/* Mount time */
1332 /*30*/	__le32	s_wtime;		/* Write time */
1333 	__le16	s_mnt_count;		/* Mount count */
1334 	__le16	s_max_mnt_count;	/* Maximal mount count */
1335 	__le16	s_magic;		/* Magic signature */
1336 	__le16	s_state;		/* File system state */
1337 	__le16	s_errors;		/* Behaviour when detecting errors */
1338 	__le16	s_minor_rev_level;	/* minor revision level */
1339 /*40*/	__le32	s_lastcheck;		/* time of last check */
1340 	__le32	s_checkinterval;	/* max. time between checks */
1341 	__le32	s_creator_os;		/* OS */
1342 	__le32	s_rev_level;		/* Revision level */
1343 /*50*/	__le16	s_def_resuid;		/* Default uid for reserved blocks */
1344 	__le16	s_def_resgid;		/* Default gid for reserved blocks */
1345 	/*
1346 	 * These fields are for EXT4_DYNAMIC_REV superblocks only.
1347 	 *
1348 	 * Note: the difference between the compatible feature set and
1349 	 * the incompatible feature set is that if there is a bit set
1350 	 * in the incompatible feature set that the kernel doesn't
1351 	 * know about, it should refuse to mount the filesystem.
1352 	 *
1353 	 * e2fsck's requirements are more strict; if it doesn't know
1354 	 * about a feature in either the compatible or incompatible
1355 	 * feature set, it must abort and not try to meddle with
1356 	 * things it doesn't understand...
1357 	 */
1358 	__le32	s_first_ino;		/* First non-reserved inode */
1359 	__le16  s_inode_size;		/* size of inode structure */
1360 	__le16	s_block_group_nr;	/* block group # of this superblock */
1361 	__le32	s_feature_compat;	/* compatible feature set */
1362 /*60*/	__le32	s_feature_incompat;	/* incompatible feature set */
1363 	__le32	s_feature_ro_compat;	/* readonly-compatible feature set */
1364 /*68*/	__u8	s_uuid[16];		/* 128-bit uuid for volume */
1365 /*78*/	char	s_volume_name[EXT4_LABEL_MAX];	/* volume name */
1366 /*88*/	char	s_last_mounted[64] __nonstring;	/* directory where last mounted */
1367 /*C8*/	__le32	s_algorithm_usage_bitmap; /* For compression */
1368 	/*
1369 	 * Performance hints.  Directory preallocation should only
1370 	 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
1371 	 */
1372 	__u8	s_prealloc_blocks;	/* Nr of blocks to try to preallocate*/
1373 	__u8	s_prealloc_dir_blocks;	/* Nr to preallocate for dirs */
1374 	__le16	s_reserved_gdt_blocks;	/* Per group desc for online growth */
1375 	/*
1376 	 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
1377 	 */
1378 /*D0*/	__u8	s_journal_uuid[16];	/* uuid of journal superblock */
1379 /*E0*/	__le32	s_journal_inum;		/* inode number of journal file */
1380 	__le32	s_journal_dev;		/* device number of journal file */
1381 	__le32	s_last_orphan;		/* start of list of inodes to delete */
1382 	__le32	s_hash_seed[4];		/* HTREE hash seed */
1383 	__u8	s_def_hash_version;	/* Default hash version to use */
1384 	__u8	s_jnl_backup_type;
1385 	__le16  s_desc_size;		/* size of group descriptor */
1386 /*100*/	__le32	s_default_mount_opts;
1387 	__le32	s_first_meta_bg;	/* First metablock block group */
1388 	__le32	s_mkfs_time;		/* When the filesystem was created */
1389 	__le32	s_jnl_blocks[17];	/* Backup of the journal inode */
1390 	/* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
1391 /*150*/	__le32	s_blocks_count_hi;	/* Blocks count */
1392 	__le32	s_r_blocks_count_hi;	/* Reserved blocks count */
1393 	__le32	s_free_blocks_count_hi;	/* Free blocks count */
1394 	__le16	s_min_extra_isize;	/* All inodes have at least # bytes */
1395 	__le16	s_want_extra_isize; 	/* New inodes should reserve # bytes */
1396 	__le32	s_flags;		/* Miscellaneous flags */
1397 	__le16  s_raid_stride;		/* RAID stride */
1398 	__le16  s_mmp_update_interval;  /* # seconds to wait in MMP checking */
1399 	__le64  s_mmp_block;            /* Block for multi-mount protection */
1400 	__le32  s_raid_stripe_width;    /* blocks on all data disks (N*stride)*/
1401 	__u8	s_log_groups_per_flex;  /* FLEX_BG group size */
1402 	__u8	s_checksum_type;	/* metadata checksum algorithm used */
1403 	__u8	s_encryption_level;	/* versioning level for encryption */
1404 	__u8	s_reserved_pad;		/* Padding to next 32bits */
1405 	__le64	s_kbytes_written;	/* nr of lifetime kilobytes written */
1406 	__le32	s_snapshot_inum;	/* Inode number of active snapshot */
1407 	__le32	s_snapshot_id;		/* sequential ID of active snapshot */
1408 	__le64	s_snapshot_r_blocks_count; /* reserved blocks for active
1409 					      snapshot's future use */
1410 	__le32	s_snapshot_list;	/* inode number of the head of the
1411 					   on-disk snapshot list */
1412 #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count)
1413 	__le32	s_error_count;		/* number of fs errors */
1414 	__le32	s_first_error_time;	/* first time an error happened */
1415 	__le32	s_first_error_ino;	/* inode involved in first error */
1416 	__le64	s_first_error_block;	/* block involved of first error */
1417 	__u8	s_first_error_func[32] __nonstring;	/* function where the error happened */
1418 	__le32	s_first_error_line;	/* line number where error happened */
1419 	__le32	s_last_error_time;	/* most recent time of an error */
1420 	__le32	s_last_error_ino;	/* inode involved in last error */
1421 	__le32	s_last_error_line;	/* line number where error happened */
1422 	__le64	s_last_error_block;	/* block involved of last error */
1423 	__u8	s_last_error_func[32] __nonstring;	/* function where the error happened */
1424 #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts)
1425 	__u8	s_mount_opts[64];
1426 	__le32	s_usr_quota_inum;	/* inode for tracking user quota */
1427 	__le32	s_grp_quota_inum;	/* inode for tracking group quota */
1428 	__le32	s_overhead_clusters;	/* overhead blocks/clusters in fs */
1429 	__le32	s_backup_bgs[2];	/* groups with sparse_super2 SBs */
1430 	__u8	s_encrypt_algos[4];	/* Encryption algorithms in use  */
1431 	__u8	s_encrypt_pw_salt[16];	/* Salt used for string2key algorithm */
1432 	__le32	s_lpf_ino;		/* Location of the lost+found inode */
1433 	__le32	s_prj_quota_inum;	/* inode for tracking project quota */
1434 	__le32	s_checksum_seed;	/* crc32c(uuid) if csum_seed set */
1435 	__u8	s_wtime_hi;
1436 	__u8	s_mtime_hi;
1437 	__u8	s_mkfs_time_hi;
1438 	__u8	s_lastcheck_hi;
1439 	__u8	s_first_error_time_hi;
1440 	__u8	s_last_error_time_hi;
1441 	__u8	s_first_error_errcode;
1442 	__u8    s_last_error_errcode;
1443 	__le16  s_encoding;		/* Filename charset encoding */
1444 	__le16  s_encoding_flags;	/* Filename charset encoding flags */
1445 	__le32  s_orphan_file_inum;	/* Inode for tracking orphan inodes */
1446 	__le32	s_reserved[94];		/* Padding to the end of the block */
1447 	__le32	s_checksum;		/* crc32c(superblock) */
1448 };
1449 
1450 #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START)
1451 
1452 #ifdef __KERNEL__
1453 
1454 /* Number of quota types we support */
1455 #define EXT4_MAXQUOTAS 3
1456 
1457 #define EXT4_ENC_UTF8_12_1	1
1458 
1459 /* Types of ext4 journal triggers */
1460 enum ext4_journal_trigger_type {
1461 	EXT4_JTR_ORPHAN_FILE,
1462 	EXT4_JTR_NONE	/* This must be the last entry for indexing to work! */
1463 };
1464 
1465 #define EXT4_JOURNAL_TRIGGER_COUNT EXT4_JTR_NONE
1466 
1467 struct ext4_journal_trigger {
1468 	struct jbd2_buffer_trigger_type tr_triggers;
1469 	struct super_block *sb;
1470 };
1471 
EXT4_TRIGGER(struct jbd2_buffer_trigger_type * trigger)1472 static inline struct ext4_journal_trigger *EXT4_TRIGGER(
1473 				struct jbd2_buffer_trigger_type *trigger)
1474 {
1475 	return container_of(trigger, struct ext4_journal_trigger, tr_triggers);
1476 }
1477 
1478 #define EXT4_ORPHAN_BLOCK_MAGIC 0x0b10ca04
1479 
1480 /* Structure at the tail of orphan block */
1481 struct ext4_orphan_block_tail {
1482 	__le32 ob_magic;
1483 	__le32 ob_checksum;
1484 };
1485 
ext4_inodes_per_orphan_block(struct super_block * sb)1486 static inline int ext4_inodes_per_orphan_block(struct super_block *sb)
1487 {
1488 	return (sb->s_blocksize - sizeof(struct ext4_orphan_block_tail)) /
1489 			sizeof(u32);
1490 }
1491 
1492 struct ext4_orphan_block {
1493 	atomic_t ob_free_entries;	/* Number of free orphan entries in block */
1494 	struct buffer_head *ob_bh;	/* Buffer for orphan block */
1495 };
1496 
1497 /*
1498  * Info about orphan file.
1499  */
1500 struct ext4_orphan_info {
1501 	int of_blocks;			/* Number of orphan blocks in a file */
1502 	__u32 of_csum_seed;		/* Checksum seed for orphan file */
1503 	struct ext4_orphan_block *of_binfo;	/* Array with info about orphan
1504 						 * file blocks */
1505 };
1506 
1507 /*
1508  * fourth extended-fs super-block data in memory
1509  */
1510 struct ext4_sb_info {
1511 	unsigned long s_desc_size;	/* Size of a group descriptor in bytes */
1512 	unsigned long s_inodes_per_block;/* Number of inodes per block */
1513 	unsigned long s_blocks_per_group;/* Number of blocks in a group */
1514 	unsigned long s_clusters_per_group; /* Number of clusters in a group */
1515 	unsigned long s_inodes_per_group;/* Number of inodes in a group */
1516 	unsigned long s_itb_per_group;	/* Number of inode table blocks per group */
1517 	unsigned long s_gdb_count;	/* Number of group descriptor blocks */
1518 	unsigned long s_desc_per_block;	/* Number of group descriptors per block */
1519 	ext4_group_t s_groups_count;	/* Number of groups in the fs */
1520 	ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */
1521 	unsigned long s_overhead;  /* # of fs overhead clusters */
1522 	unsigned int s_cluster_ratio;	/* Number of blocks per cluster */
1523 	unsigned int s_cluster_bits;	/* log2 of s_cluster_ratio */
1524 	loff_t s_bitmap_maxbytes;	/* max bytes for bitmap files */
1525 	struct buffer_head * s_sbh;	/* Buffer containing the super block */
1526 	struct ext4_super_block *s_es;	/* Pointer to the super block in the buffer */
1527 	struct buffer_head * __rcu *s_group_desc;
1528 	unsigned int s_mount_opt;
1529 	unsigned int s_mount_opt2;
1530 	unsigned long s_mount_flags;
1531 	unsigned int s_def_mount_opt;
1532 	ext4_fsblk_t s_sb_block;
1533 	atomic64_t s_resv_clusters;
1534 	kuid_t s_resuid;
1535 	kgid_t s_resgid;
1536 	unsigned short s_mount_state;
1537 	unsigned short s_pad;
1538 	int s_addr_per_block_bits;
1539 	int s_desc_per_block_bits;
1540 	int s_inode_size;
1541 	int s_first_ino;
1542 	unsigned int s_inode_readahead_blks;
1543 	unsigned int s_inode_goal;
1544 	u32 s_hash_seed[4];
1545 	int s_def_hash_version;
1546 	int s_hash_unsigned;	/* 3 if hash should be unsigned, 0 if not */
1547 	struct percpu_counter s_freeclusters_counter;
1548 	struct percpu_counter s_freeinodes_counter;
1549 	struct percpu_counter s_dirs_counter;
1550 	struct percpu_counter s_dirtyclusters_counter;
1551 	struct percpu_counter s_sra_exceeded_retry_limit;
1552 	struct blockgroup_lock *s_blockgroup_lock;
1553 	struct proc_dir_entry *s_proc;
1554 	struct kobject s_kobj;
1555 	struct completion s_kobj_unregister;
1556 	struct super_block *s_sb;
1557 	struct buffer_head *s_mmp_bh;
1558 
1559 	/* Journaling */
1560 	struct journal_s *s_journal;
1561 	unsigned long s_ext4_flags;		/* Ext4 superblock flags */
1562 	struct mutex s_orphan_lock;	/* Protects on disk list changes */
1563 	struct list_head s_orphan;	/* List of orphaned inodes in on disk
1564 					   list */
1565 	struct ext4_orphan_info s_orphan_info;
1566 	unsigned long s_commit_interval;
1567 	u32 s_max_batch_time;
1568 	u32 s_min_batch_time;
1569 	struct block_device *s_journal_bdev;
1570 #ifdef CONFIG_QUOTA
1571 	/* Names of quota files with journalled quota */
1572 	char __rcu *s_qf_names[EXT4_MAXQUOTAS];
1573 	int s_jquota_fmt;			/* Format of quota to use */
1574 #endif
1575 	unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */
1576 	struct ext4_system_blocks __rcu *s_system_blks;
1577 
1578 #ifdef EXTENTS_STATS
1579 	/* ext4 extents stats */
1580 	unsigned long s_ext_min;
1581 	unsigned long s_ext_max;
1582 	unsigned long s_depth_max;
1583 	spinlock_t s_ext_stats_lock;
1584 	unsigned long s_ext_blocks;
1585 	unsigned long s_ext_extents;
1586 #endif
1587 
1588 	/* for buddy allocator */
1589 	struct ext4_group_info ** __rcu *s_group_info;
1590 	struct inode *s_buddy_cache;
1591 	spinlock_t s_md_lock;
1592 	unsigned short *s_mb_offsets;
1593 	unsigned int *s_mb_maxs;
1594 	unsigned int s_group_info_size;
1595 	unsigned int s_mb_free_pending;
1596 	struct list_head s_freed_data_list;	/* List of blocks to be freed
1597 						   after commit completed */
1598 	struct list_head s_discard_list;
1599 	struct work_struct s_discard_work;
1600 	atomic_t s_retry_alloc_pending;
1601 	struct list_head *s_mb_avg_fragment_size;
1602 	rwlock_t *s_mb_avg_fragment_size_locks;
1603 	struct list_head *s_mb_largest_free_orders;
1604 	rwlock_t *s_mb_largest_free_orders_locks;
1605 
1606 	/* tunables */
1607 	unsigned long s_stripe;
1608 	unsigned int s_mb_max_linear_groups;
1609 	unsigned int s_mb_stream_request;
1610 	unsigned int s_mb_max_to_scan;
1611 	unsigned int s_mb_min_to_scan;
1612 	unsigned int s_mb_stats;
1613 	unsigned int s_mb_order2_reqs;
1614 	unsigned int s_mb_group_prealloc;
1615 	unsigned int s_mb_max_inode_prealloc;
1616 	unsigned int s_max_dir_size_kb;
1617 	/* where last allocation was done - for stream allocation */
1618 	unsigned long s_mb_last_group;
1619 	unsigned long s_mb_last_start;
1620 	unsigned int s_mb_prefetch;
1621 	unsigned int s_mb_prefetch_limit;
1622 
1623 	/* stats for buddy allocator */
1624 	atomic_t s_bal_reqs;	/* number of reqs with len > 1 */
1625 	atomic_t s_bal_success;	/* we found long enough chunks */
1626 	atomic_t s_bal_allocated;	/* in blocks */
1627 	atomic_t s_bal_ex_scanned;	/* total extents scanned */
1628 	atomic_t s_bal_groups_scanned;	/* number of groups scanned */
1629 	atomic_t s_bal_goals;	/* goal hits */
1630 	atomic_t s_bal_breaks;	/* too long searches */
1631 	atomic_t s_bal_2orders;	/* 2^order hits */
1632 	atomic_t s_bal_cr0_bad_suggestions;
1633 	atomic_t s_bal_cr1_bad_suggestions;
1634 	atomic64_t s_bal_cX_groups_considered[4];
1635 	atomic64_t s_bal_cX_hits[4];
1636 	atomic64_t s_bal_cX_failed[4];		/* cX loop didn't find blocks */
1637 	atomic_t s_mb_buddies_generated;	/* number of buddies generated */
1638 	atomic64_t s_mb_generation_time;
1639 	atomic_t s_mb_lost_chunks;
1640 	atomic_t s_mb_preallocated;
1641 	atomic_t s_mb_discarded;
1642 	atomic_t s_lock_busy;
1643 
1644 	/* locality groups */
1645 	struct ext4_locality_group __percpu *s_locality_groups;
1646 
1647 	/* for write statistics */
1648 	unsigned long s_sectors_written_start;
1649 	u64 s_kbytes_written;
1650 
1651 	/* the size of zero-out chunk */
1652 	unsigned int s_extent_max_zeroout_kb;
1653 
1654 	unsigned int s_log_groups_per_flex;
1655 	struct flex_groups * __rcu *s_flex_groups;
1656 	ext4_group_t s_flex_groups_allocated;
1657 
1658 	/* workqueue for reserved extent conversions (buffered io) */
1659 	struct workqueue_struct *rsv_conversion_wq;
1660 
1661 	/* timer for periodic error stats printing */
1662 	struct timer_list s_err_report;
1663 
1664 	/* Lazy inode table initialization info */
1665 	struct ext4_li_request *s_li_request;
1666 	/* Wait multiplier for lazy initialization thread */
1667 	unsigned int s_li_wait_mult;
1668 
1669 	/* Kernel thread for multiple mount protection */
1670 	struct task_struct *s_mmp_tsk;
1671 
1672 	/* record the last minlen when FITRIM is called. */
1673 	unsigned long s_last_trim_minblks;
1674 
1675 	/* Reference to checksum algorithm driver via cryptoapi */
1676 	struct crypto_shash *s_chksum_driver;
1677 
1678 	/* Precomputed FS UUID checksum for seeding other checksums */
1679 	__u32 s_csum_seed;
1680 
1681 	/* Reclaim extents from extent status tree */
1682 	struct shrinker s_es_shrinker;
1683 	struct list_head s_es_list;	/* List of inodes with reclaimable extents */
1684 	long s_es_nr_inode;
1685 	struct ext4_es_stats s_es_stats;
1686 	struct mb_cache *s_ea_block_cache;
1687 	struct mb_cache *s_ea_inode_cache;
1688 	spinlock_t s_es_lock ____cacheline_aligned_in_smp;
1689 
1690 	/* Journal triggers for checksum computation */
1691 	struct ext4_journal_trigger s_journal_triggers[EXT4_JOURNAL_TRIGGER_COUNT];
1692 
1693 	/* Ratelimit ext4 messages. */
1694 	struct ratelimit_state s_err_ratelimit_state;
1695 	struct ratelimit_state s_warning_ratelimit_state;
1696 	struct ratelimit_state s_msg_ratelimit_state;
1697 	atomic_t s_warning_count;
1698 	atomic_t s_msg_count;
1699 
1700 	/* Encryption policy for '-o test_dummy_encryption' */
1701 	struct fscrypt_dummy_policy s_dummy_enc_policy;
1702 
1703 	/*
1704 	 * Barrier between writepages ops and changing any inode's JOURNAL_DATA
1705 	 * or EXTENTS flag.
1706 	 */
1707 	struct percpu_rw_semaphore s_writepages_rwsem;
1708 	struct dax_device *s_daxdev;
1709 	u64 s_dax_part_off;
1710 #ifdef CONFIG_EXT4_DEBUG
1711 	unsigned long s_simulate_fail;
1712 #endif
1713 	/* Record the errseq of the backing block device */
1714 	errseq_t s_bdev_wb_err;
1715 	spinlock_t s_bdev_wb_lock;
1716 
1717 	/* Information about errors that happened during this mount */
1718 	spinlock_t s_error_lock;
1719 	int s_add_error_count;
1720 	int s_first_error_code;
1721 	__u32 s_first_error_line;
1722 	__u32 s_first_error_ino;
1723 	__u64 s_first_error_block;
1724 	const char *s_first_error_func;
1725 	time64_t s_first_error_time;
1726 	int s_last_error_code;
1727 	__u32 s_last_error_line;
1728 	__u32 s_last_error_ino;
1729 	__u64 s_last_error_block;
1730 	const char *s_last_error_func;
1731 	time64_t s_last_error_time;
1732 	/*
1733 	 * If we are in a context where we cannot update error information in
1734 	 * the on-disk superblock, we queue this work to do it.
1735 	 */
1736 	struct work_struct s_error_work;
1737 
1738 	/* Ext4 fast commit sub transaction ID */
1739 	atomic_t s_fc_subtid;
1740 
1741 	/*
1742 	 * After commit starts, the main queue gets locked, and the further
1743 	 * updates get added in the staging queue.
1744 	 */
1745 #define FC_Q_MAIN	0
1746 #define FC_Q_STAGING	1
1747 	struct list_head s_fc_q[2];	/* Inodes staged for fast commit
1748 					 * that have data changes in them.
1749 					 */
1750 	struct list_head s_fc_dentry_q[2];	/* directory entry updates */
1751 	unsigned int s_fc_bytes;
1752 	/*
1753 	 * Main fast commit lock. This lock protects accesses to the
1754 	 * following fields:
1755 	 * ei->i_fc_list, s_fc_dentry_q, s_fc_q, s_fc_bytes, s_fc_bh.
1756 	 */
1757 	spinlock_t s_fc_lock;
1758 	struct buffer_head *s_fc_bh;
1759 	struct ext4_fc_stats s_fc_stats;
1760 	tid_t s_fc_ineligible_tid;
1761 #ifdef CONFIG_EXT4_DEBUG
1762 	int s_fc_debug_max_replay;
1763 #endif
1764 	struct ext4_fc_replay_state s_fc_replay_state;
1765 };
1766 
EXT4_SB(struct super_block * sb)1767 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb)
1768 {
1769 	return sb->s_fs_info;
1770 }
EXT4_I(struct inode * inode)1771 static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
1772 {
1773 	return container_of(inode, struct ext4_inode_info, vfs_inode);
1774 }
1775 
ext4_valid_inum(struct super_block * sb,unsigned long ino)1776 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
1777 {
1778 	return ino == EXT4_ROOT_INO ||
1779 		(ino >= EXT4_FIRST_INO(sb) &&
1780 		 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
1781 }
1782 
1783 /*
1784  * Returns: sbi->field[index]
1785  * Used to access an array element from the following sbi fields which require
1786  * rcu protection to avoid dereferencing an invalid pointer due to reassignment
1787  * - s_group_desc
1788  * - s_group_info
1789  * - s_flex_group
1790  */
1791 #define sbi_array_rcu_deref(sbi, field, index)				   \
1792 ({									   \
1793 	typeof(*((sbi)->field)) _v;					   \
1794 	rcu_read_lock();						   \
1795 	_v = ((typeof(_v)*)rcu_dereference((sbi)->field))[index];	   \
1796 	rcu_read_unlock();						   \
1797 	_v;								   \
1798 })
1799 
1800 /*
1801  * run-time mount flags
1802  */
1803 enum {
1804 	EXT4_MF_MNTDIR_SAMPLED,
1805 	EXT4_MF_FS_ABORTED,	/* Fatal error detected */
1806 	EXT4_MF_FC_INELIGIBLE	/* Fast commit ineligible */
1807 };
1808 
ext4_set_mount_flag(struct super_block * sb,int bit)1809 static inline void ext4_set_mount_flag(struct super_block *sb, int bit)
1810 {
1811 	set_bit(bit, &EXT4_SB(sb)->s_mount_flags);
1812 }
1813 
ext4_clear_mount_flag(struct super_block * sb,int bit)1814 static inline void ext4_clear_mount_flag(struct super_block *sb, int bit)
1815 {
1816 	clear_bit(bit, &EXT4_SB(sb)->s_mount_flags);
1817 }
1818 
ext4_test_mount_flag(struct super_block * sb,int bit)1819 static inline int ext4_test_mount_flag(struct super_block *sb, int bit)
1820 {
1821 	return test_bit(bit, &EXT4_SB(sb)->s_mount_flags);
1822 }
1823 
1824 
1825 /*
1826  * Simulate_fail codes
1827  */
1828 #define EXT4_SIM_BBITMAP_EIO	1
1829 #define EXT4_SIM_BBITMAP_CRC	2
1830 #define EXT4_SIM_IBITMAP_EIO	3
1831 #define EXT4_SIM_IBITMAP_CRC	4
1832 #define EXT4_SIM_INODE_EIO	5
1833 #define EXT4_SIM_INODE_CRC	6
1834 #define EXT4_SIM_DIRBLOCK_EIO	7
1835 #define EXT4_SIM_DIRBLOCK_CRC	8
1836 
ext4_simulate_fail(struct super_block * sb,unsigned long code)1837 static inline bool ext4_simulate_fail(struct super_block *sb,
1838 				     unsigned long code)
1839 {
1840 #ifdef CONFIG_EXT4_DEBUG
1841 	struct ext4_sb_info *sbi = EXT4_SB(sb);
1842 
1843 	if (unlikely(sbi->s_simulate_fail == code)) {
1844 		sbi->s_simulate_fail = 0;
1845 		return true;
1846 	}
1847 #endif
1848 	return false;
1849 }
1850 
ext4_simulate_fail_bh(struct super_block * sb,struct buffer_head * bh,unsigned long code)1851 static inline void ext4_simulate_fail_bh(struct super_block *sb,
1852 					 struct buffer_head *bh,
1853 					 unsigned long code)
1854 {
1855 	if (!IS_ERR(bh) && ext4_simulate_fail(sb, code))
1856 		clear_buffer_uptodate(bh);
1857 }
1858 
1859 /*
1860  * Error number codes for s_{first,last}_error_errno
1861  *
1862  * Linux errno numbers are architecture specific, so we need to translate
1863  * them into something which is architecture independent.   We don't define
1864  * codes for all errno's; just the ones which are most likely to be the cause
1865  * of an ext4_error() call.
1866  */
1867 #define EXT4_ERR_UNKNOWN	 1
1868 #define EXT4_ERR_EIO		 2
1869 #define EXT4_ERR_ENOMEM		 3
1870 #define EXT4_ERR_EFSBADCRC	 4
1871 #define EXT4_ERR_EFSCORRUPTED	 5
1872 #define EXT4_ERR_ENOSPC		 6
1873 #define EXT4_ERR_ENOKEY		 7
1874 #define EXT4_ERR_EROFS		 8
1875 #define EXT4_ERR_EFBIG		 9
1876 #define EXT4_ERR_EEXIST		10
1877 #define EXT4_ERR_ERANGE		11
1878 #define EXT4_ERR_EOVERFLOW	12
1879 #define EXT4_ERR_EBUSY		13
1880 #define EXT4_ERR_ENOTDIR	14
1881 #define EXT4_ERR_ENOTEMPTY	15
1882 #define EXT4_ERR_ESHUTDOWN	16
1883 #define EXT4_ERR_EFAULT		17
1884 
1885 /*
1886  * Inode dynamic state flags
1887  */
1888 enum {
1889 	EXT4_STATE_JDATA,		/* journaled data exists */
1890 	EXT4_STATE_NEW,			/* inode is newly created */
1891 	EXT4_STATE_XATTR,		/* has in-inode xattrs */
1892 	EXT4_STATE_NO_EXPAND,		/* No space for expansion */
1893 	EXT4_STATE_DA_ALLOC_CLOSE,	/* Alloc DA blks on close */
1894 	EXT4_STATE_EXT_MIGRATE,		/* Inode is migrating */
1895 	EXT4_STATE_NEWENTRY,		/* File just added to dir */
1896 	EXT4_STATE_MAY_INLINE_DATA,	/* may have in-inode data */
1897 	EXT4_STATE_EXT_PRECACHED,	/* extents have been precached */
1898 	EXT4_STATE_LUSTRE_EA_INODE,	/* Lustre-style ea_inode */
1899 	EXT4_STATE_VERITY_IN_PROGRESS,	/* building fs-verity Merkle tree */
1900 	EXT4_STATE_FC_COMMITTING,	/* Fast commit ongoing */
1901 	EXT4_STATE_ORPHAN_FILE,		/* Inode orphaned in orphan file */
1902 };
1903 
1904 #define EXT4_INODE_BIT_FNS(name, field, offset)				\
1905 static inline int ext4_test_inode_##name(struct inode *inode, int bit)	\
1906 {									\
1907 	return test_bit(bit + (offset), &EXT4_I(inode)->i_##field);	\
1908 }									\
1909 static inline void ext4_set_inode_##name(struct inode *inode, int bit)	\
1910 {									\
1911 	set_bit(bit + (offset), &EXT4_I(inode)->i_##field);		\
1912 }									\
1913 static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \
1914 {									\
1915 	clear_bit(bit + (offset), &EXT4_I(inode)->i_##field);		\
1916 }
1917 
1918 /* Add these declarations here only so that these functions can be
1919  * found by name.  Otherwise, they are very hard to locate. */
1920 static inline int ext4_test_inode_flag(struct inode *inode, int bit);
1921 static inline void ext4_set_inode_flag(struct inode *inode, int bit);
1922 static inline void ext4_clear_inode_flag(struct inode *inode, int bit);
1923 EXT4_INODE_BIT_FNS(flag, flags, 0)
1924 
1925 /* Add these declarations here only so that these functions can be
1926  * found by name.  Otherwise, they are very hard to locate. */
1927 static inline int ext4_test_inode_state(struct inode *inode, int bit);
1928 static inline void ext4_set_inode_state(struct inode *inode, int bit);
1929 static inline void ext4_clear_inode_state(struct inode *inode, int bit);
1930 #if (BITS_PER_LONG < 64)
1931 EXT4_INODE_BIT_FNS(state, state_flags, 0)
1932 
ext4_clear_state_flags(struct ext4_inode_info * ei)1933 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1934 {
1935 	(ei)->i_state_flags = 0;
1936 }
1937 #else
1938 EXT4_INODE_BIT_FNS(state, flags, 32)
1939 
ext4_clear_state_flags(struct ext4_inode_info * ei)1940 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1941 {
1942 	/* We depend on the fact that callers will set i_flags */
1943 }
1944 #endif
1945 #else
1946 /* Assume that user mode programs are passing in an ext4fs superblock, not
1947  * a kernel struct super_block.  This will allow us to call the feature-test
1948  * macros from user land. */
1949 #define EXT4_SB(sb)	(sb)
1950 #endif
1951 
ext4_verity_in_progress(struct inode * inode)1952 static inline bool ext4_verity_in_progress(struct inode *inode)
1953 {
1954 	return IS_ENABLED(CONFIG_FS_VERITY) &&
1955 	       ext4_test_inode_state(inode, EXT4_STATE_VERITY_IN_PROGRESS);
1956 }
1957 
1958 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
1959 
1960 /*
1961  * Codes for operating systems
1962  */
1963 #define EXT4_OS_LINUX		0
1964 #define EXT4_OS_HURD		1
1965 #define EXT4_OS_MASIX		2
1966 #define EXT4_OS_FREEBSD		3
1967 #define EXT4_OS_LITES		4
1968 
1969 /*
1970  * Revision levels
1971  */
1972 #define EXT4_GOOD_OLD_REV	0	/* The good old (original) format */
1973 #define EXT4_DYNAMIC_REV	1	/* V2 format w/ dynamic inode sizes */
1974 
1975 #define EXT4_MAX_SUPP_REV	EXT4_DYNAMIC_REV
1976 
1977 #define EXT4_GOOD_OLD_INODE_SIZE 128
1978 
1979 #define EXT4_EXTRA_TIMESTAMP_MAX	(((s64)1 << 34) - 1  + S32_MIN)
1980 #define EXT4_NON_EXTRA_TIMESTAMP_MAX	S32_MAX
1981 #define EXT4_TIMESTAMP_MIN		S32_MIN
1982 
1983 /*
1984  * Feature set definitions
1985  */
1986 
1987 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC	0x0001
1988 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES	0x0002
1989 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL		0x0004
1990 #define EXT4_FEATURE_COMPAT_EXT_ATTR		0x0008
1991 #define EXT4_FEATURE_COMPAT_RESIZE_INODE	0x0010
1992 #define EXT4_FEATURE_COMPAT_DIR_INDEX		0x0020
1993 #define EXT4_FEATURE_COMPAT_SPARSE_SUPER2	0x0200
1994 /*
1995  * The reason why "FAST_COMMIT" is a compat feature is that, FS becomes
1996  * incompatible only if fast commit blocks are present in the FS. Since we
1997  * clear the journal (and thus the fast commit blocks), we don't mark FS as
1998  * incompatible. We also have a JBD2 incompat feature, which gets set when
1999  * there are fast commit blocks present in the journal.
2000  */
2001 #define EXT4_FEATURE_COMPAT_FAST_COMMIT		0x0400
2002 #define EXT4_FEATURE_COMPAT_STABLE_INODES	0x0800
2003 #define EXT4_FEATURE_COMPAT_ORPHAN_FILE		0x1000	/* Orphan file exists */
2004 
2005 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER	0x0001
2006 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE	0x0002
2007 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR	0x0004
2008 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE        0x0008
2009 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM		0x0010
2010 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK	0x0020
2011 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE	0x0040
2012 #define EXT4_FEATURE_RO_COMPAT_QUOTA		0x0100
2013 #define EXT4_FEATURE_RO_COMPAT_BIGALLOC		0x0200
2014 /*
2015  * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM).  When
2016  * METADATA_CSUM is set, group descriptor checksums use the same algorithm as
2017  * all other data structures' checksums.  However, the METADATA_CSUM and
2018  * GDT_CSUM bits are mutually exclusive.
2019  */
2020 #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM	0x0400
2021 #define EXT4_FEATURE_RO_COMPAT_READONLY		0x1000
2022 #define EXT4_FEATURE_RO_COMPAT_PROJECT		0x2000
2023 #define EXT4_FEATURE_RO_COMPAT_VERITY		0x8000
2024 #define EXT4_FEATURE_RO_COMPAT_ORPHAN_PRESENT	0x10000 /* Orphan file may be
2025 							   non-empty */
2026 
2027 #define EXT4_FEATURE_INCOMPAT_COMPRESSION	0x0001
2028 #define EXT4_FEATURE_INCOMPAT_FILETYPE		0x0002
2029 #define EXT4_FEATURE_INCOMPAT_RECOVER		0x0004 /* Needs recovery */
2030 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV	0x0008 /* Journal device */
2031 #define EXT4_FEATURE_INCOMPAT_META_BG		0x0010
2032 #define EXT4_FEATURE_INCOMPAT_EXTENTS		0x0040 /* extents support */
2033 #define EXT4_FEATURE_INCOMPAT_64BIT		0x0080
2034 #define EXT4_FEATURE_INCOMPAT_MMP               0x0100
2035 #define EXT4_FEATURE_INCOMPAT_FLEX_BG		0x0200
2036 #define EXT4_FEATURE_INCOMPAT_EA_INODE		0x0400 /* EA in inode */
2037 #define EXT4_FEATURE_INCOMPAT_DIRDATA		0x1000 /* data in dirent */
2038 #define EXT4_FEATURE_INCOMPAT_CSUM_SEED		0x2000
2039 #define EXT4_FEATURE_INCOMPAT_LARGEDIR		0x4000 /* >2GB or 3-lvl htree */
2040 #define EXT4_FEATURE_INCOMPAT_INLINE_DATA	0x8000 /* data in inode */
2041 #define EXT4_FEATURE_INCOMPAT_ENCRYPT		0x10000
2042 #define EXT4_FEATURE_INCOMPAT_CASEFOLD		0x20000
2043 
2044 extern void ext4_update_dynamic_rev(struct super_block *sb);
2045 
2046 #define EXT4_FEATURE_COMPAT_FUNCS(name, flagname) \
2047 static inline bool ext4_has_feature_##name(struct super_block *sb) \
2048 { \
2049 	return ((EXT4_SB(sb)->s_es->s_feature_compat & \
2050 		cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname)) != 0); \
2051 } \
2052 static inline void ext4_set_feature_##name(struct super_block *sb) \
2053 { \
2054 	ext4_update_dynamic_rev(sb); \
2055 	EXT4_SB(sb)->s_es->s_feature_compat |= \
2056 		cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \
2057 } \
2058 static inline void ext4_clear_feature_##name(struct super_block *sb) \
2059 { \
2060 	EXT4_SB(sb)->s_es->s_feature_compat &= \
2061 		~cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \
2062 }
2063 
2064 #define EXT4_FEATURE_RO_COMPAT_FUNCS(name, flagname) \
2065 static inline bool ext4_has_feature_##name(struct super_block *sb) \
2066 { \
2067 	return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \
2068 		cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname)) != 0); \
2069 } \
2070 static inline void ext4_set_feature_##name(struct super_block *sb) \
2071 { \
2072 	ext4_update_dynamic_rev(sb); \
2073 	EXT4_SB(sb)->s_es->s_feature_ro_compat |= \
2074 		cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \
2075 } \
2076 static inline void ext4_clear_feature_##name(struct super_block *sb) \
2077 { \
2078 	EXT4_SB(sb)->s_es->s_feature_ro_compat &= \
2079 		~cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \
2080 }
2081 
2082 #define EXT4_FEATURE_INCOMPAT_FUNCS(name, flagname) \
2083 static inline bool ext4_has_feature_##name(struct super_block *sb) \
2084 { \
2085 	return ((EXT4_SB(sb)->s_es->s_feature_incompat & \
2086 		cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname)) != 0); \
2087 } \
2088 static inline void ext4_set_feature_##name(struct super_block *sb) \
2089 { \
2090 	ext4_update_dynamic_rev(sb); \
2091 	EXT4_SB(sb)->s_es->s_feature_incompat |= \
2092 		cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \
2093 } \
2094 static inline void ext4_clear_feature_##name(struct super_block *sb) \
2095 { \
2096 	EXT4_SB(sb)->s_es->s_feature_incompat &= \
2097 		~cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \
2098 }
2099 
EXT4_FEATURE_COMPAT_FUNCS(dir_prealloc,DIR_PREALLOC)2100 EXT4_FEATURE_COMPAT_FUNCS(dir_prealloc,		DIR_PREALLOC)
2101 EXT4_FEATURE_COMPAT_FUNCS(imagic_inodes,	IMAGIC_INODES)
2102 EXT4_FEATURE_COMPAT_FUNCS(journal,		HAS_JOURNAL)
2103 EXT4_FEATURE_COMPAT_FUNCS(xattr,		EXT_ATTR)
2104 EXT4_FEATURE_COMPAT_FUNCS(resize_inode,		RESIZE_INODE)
2105 EXT4_FEATURE_COMPAT_FUNCS(dir_index,		DIR_INDEX)
2106 EXT4_FEATURE_COMPAT_FUNCS(sparse_super2,	SPARSE_SUPER2)
2107 EXT4_FEATURE_COMPAT_FUNCS(fast_commit,		FAST_COMMIT)
2108 EXT4_FEATURE_COMPAT_FUNCS(stable_inodes,	STABLE_INODES)
2109 EXT4_FEATURE_COMPAT_FUNCS(orphan_file,		ORPHAN_FILE)
2110 
2111 EXT4_FEATURE_RO_COMPAT_FUNCS(sparse_super,	SPARSE_SUPER)
2112 EXT4_FEATURE_RO_COMPAT_FUNCS(large_file,	LARGE_FILE)
2113 EXT4_FEATURE_RO_COMPAT_FUNCS(btree_dir,		BTREE_DIR)
2114 EXT4_FEATURE_RO_COMPAT_FUNCS(huge_file,		HUGE_FILE)
2115 EXT4_FEATURE_RO_COMPAT_FUNCS(gdt_csum,		GDT_CSUM)
2116 EXT4_FEATURE_RO_COMPAT_FUNCS(dir_nlink,		DIR_NLINK)
2117 EXT4_FEATURE_RO_COMPAT_FUNCS(extra_isize,	EXTRA_ISIZE)
2118 EXT4_FEATURE_RO_COMPAT_FUNCS(quota,		QUOTA)
2119 EXT4_FEATURE_RO_COMPAT_FUNCS(bigalloc,		BIGALLOC)
2120 EXT4_FEATURE_RO_COMPAT_FUNCS(metadata_csum,	METADATA_CSUM)
2121 EXT4_FEATURE_RO_COMPAT_FUNCS(readonly,		READONLY)
2122 EXT4_FEATURE_RO_COMPAT_FUNCS(project,		PROJECT)
2123 EXT4_FEATURE_RO_COMPAT_FUNCS(verity,		VERITY)
2124 EXT4_FEATURE_RO_COMPAT_FUNCS(orphan_present,	ORPHAN_PRESENT)
2125 
2126 EXT4_FEATURE_INCOMPAT_FUNCS(compression,	COMPRESSION)
2127 EXT4_FEATURE_INCOMPAT_FUNCS(filetype,		FILETYPE)
2128 EXT4_FEATURE_INCOMPAT_FUNCS(journal_needs_recovery,	RECOVER)
2129 EXT4_FEATURE_INCOMPAT_FUNCS(journal_dev,	JOURNAL_DEV)
2130 EXT4_FEATURE_INCOMPAT_FUNCS(meta_bg,		META_BG)
2131 EXT4_FEATURE_INCOMPAT_FUNCS(extents,		EXTENTS)
2132 EXT4_FEATURE_INCOMPAT_FUNCS(64bit,		64BIT)
2133 EXT4_FEATURE_INCOMPAT_FUNCS(mmp,		MMP)
2134 EXT4_FEATURE_INCOMPAT_FUNCS(flex_bg,		FLEX_BG)
2135 EXT4_FEATURE_INCOMPAT_FUNCS(ea_inode,		EA_INODE)
2136 EXT4_FEATURE_INCOMPAT_FUNCS(dirdata,		DIRDATA)
2137 EXT4_FEATURE_INCOMPAT_FUNCS(csum_seed,		CSUM_SEED)
2138 EXT4_FEATURE_INCOMPAT_FUNCS(largedir,		LARGEDIR)
2139 EXT4_FEATURE_INCOMPAT_FUNCS(inline_data,	INLINE_DATA)
2140 EXT4_FEATURE_INCOMPAT_FUNCS(encrypt,		ENCRYPT)
2141 EXT4_FEATURE_INCOMPAT_FUNCS(casefold,		CASEFOLD)
2142 
2143 #define EXT2_FEATURE_COMPAT_SUPP	EXT4_FEATURE_COMPAT_EXT_ATTR
2144 #define EXT2_FEATURE_INCOMPAT_SUPP	(EXT4_FEATURE_INCOMPAT_FILETYPE| \
2145 					 EXT4_FEATURE_INCOMPAT_META_BG)
2146 #define EXT2_FEATURE_RO_COMPAT_SUPP	(EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
2147 					 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
2148 					 EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
2149 
2150 #define EXT3_FEATURE_COMPAT_SUPP	EXT4_FEATURE_COMPAT_EXT_ATTR
2151 #define EXT3_FEATURE_INCOMPAT_SUPP	(EXT4_FEATURE_INCOMPAT_FILETYPE| \
2152 					 EXT4_FEATURE_INCOMPAT_RECOVER| \
2153 					 EXT4_FEATURE_INCOMPAT_META_BG)
2154 #define EXT3_FEATURE_RO_COMPAT_SUPP	(EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
2155 					 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
2156 					 EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
2157 
2158 #define EXT4_FEATURE_COMPAT_SUPP	(EXT4_FEATURE_COMPAT_EXT_ATTR| \
2159 					 EXT4_FEATURE_COMPAT_ORPHAN_FILE)
2160 #define EXT4_FEATURE_INCOMPAT_SUPP	(EXT4_FEATURE_INCOMPAT_FILETYPE| \
2161 					 EXT4_FEATURE_INCOMPAT_RECOVER| \
2162 					 EXT4_FEATURE_INCOMPAT_META_BG| \
2163 					 EXT4_FEATURE_INCOMPAT_EXTENTS| \
2164 					 EXT4_FEATURE_INCOMPAT_64BIT| \
2165 					 EXT4_FEATURE_INCOMPAT_FLEX_BG| \
2166 					 EXT4_FEATURE_INCOMPAT_EA_INODE| \
2167 					 EXT4_FEATURE_INCOMPAT_MMP | \
2168 					 EXT4_FEATURE_INCOMPAT_INLINE_DATA | \
2169 					 EXT4_FEATURE_INCOMPAT_ENCRYPT | \
2170 					 EXT4_FEATURE_INCOMPAT_CASEFOLD | \
2171 					 EXT4_FEATURE_INCOMPAT_CSUM_SEED | \
2172 					 EXT4_FEATURE_INCOMPAT_LARGEDIR)
2173 #define EXT4_FEATURE_RO_COMPAT_SUPP	(EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
2174 					 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
2175 					 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
2176 					 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
2177 					 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
2178 					 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
2179 					 EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\
2180 					 EXT4_FEATURE_RO_COMPAT_BIGALLOC |\
2181 					 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\
2182 					 EXT4_FEATURE_RO_COMPAT_QUOTA |\
2183 					 EXT4_FEATURE_RO_COMPAT_PROJECT |\
2184 					 EXT4_FEATURE_RO_COMPAT_VERITY |\
2185 					 EXT4_FEATURE_RO_COMPAT_ORPHAN_PRESENT)
2186 
2187 #define EXTN_FEATURE_FUNCS(ver) \
2188 static inline bool ext4_has_unknown_ext##ver##_compat_features(struct super_block *sb) \
2189 { \
2190 	return ((EXT4_SB(sb)->s_es->s_feature_compat & \
2191 		cpu_to_le32(~EXT##ver##_FEATURE_COMPAT_SUPP)) != 0); \
2192 } \
2193 static inline bool ext4_has_unknown_ext##ver##_ro_compat_features(struct super_block *sb) \
2194 { \
2195 	return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \
2196 		cpu_to_le32(~EXT##ver##_FEATURE_RO_COMPAT_SUPP)) != 0); \
2197 } \
2198 static inline bool ext4_has_unknown_ext##ver##_incompat_features(struct super_block *sb) \
2199 { \
2200 	return ((EXT4_SB(sb)->s_es->s_feature_incompat & \
2201 		cpu_to_le32(~EXT##ver##_FEATURE_INCOMPAT_SUPP)) != 0); \
2202 }
2203 
2204 EXTN_FEATURE_FUNCS(2)
2205 EXTN_FEATURE_FUNCS(3)
2206 EXTN_FEATURE_FUNCS(4)
2207 
2208 static inline bool ext4_has_compat_features(struct super_block *sb)
2209 {
2210 	return (EXT4_SB(sb)->s_es->s_feature_compat != 0);
2211 }
ext4_has_ro_compat_features(struct super_block * sb)2212 static inline bool ext4_has_ro_compat_features(struct super_block *sb)
2213 {
2214 	return (EXT4_SB(sb)->s_es->s_feature_ro_compat != 0);
2215 }
ext4_has_incompat_features(struct super_block * sb)2216 static inline bool ext4_has_incompat_features(struct super_block *sb)
2217 {
2218 	return (EXT4_SB(sb)->s_es->s_feature_incompat != 0);
2219 }
2220 
2221 extern int ext4_feature_set_ok(struct super_block *sb, int readonly);
2222 
2223 /*
2224  * Superblock flags
2225  */
2226 #define EXT4_FLAGS_RESIZING	0
2227 #define EXT4_FLAGS_SHUTDOWN	1
2228 #define EXT4_FLAGS_BDEV_IS_DAX	2
2229 
ext4_forced_shutdown(struct ext4_sb_info * sbi)2230 static inline int ext4_forced_shutdown(struct ext4_sb_info *sbi)
2231 {
2232 	return test_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
2233 }
2234 
2235 /*
2236  * Default values for user and/or group using reserved blocks
2237  */
2238 #define	EXT4_DEF_RESUID		0
2239 #define	EXT4_DEF_RESGID		0
2240 
2241 /*
2242  * Default project ID
2243  */
2244 #define	EXT4_DEF_PROJID		0
2245 
2246 #define EXT4_DEF_INODE_READAHEAD_BLKS	32
2247 
2248 /*
2249  * Default mount options
2250  */
2251 #define EXT4_DEFM_DEBUG		0x0001
2252 #define EXT4_DEFM_BSDGROUPS	0x0002
2253 #define EXT4_DEFM_XATTR_USER	0x0004
2254 #define EXT4_DEFM_ACL		0x0008
2255 #define EXT4_DEFM_UID16		0x0010
2256 #define EXT4_DEFM_JMODE		0x0060
2257 #define EXT4_DEFM_JMODE_DATA	0x0020
2258 #define EXT4_DEFM_JMODE_ORDERED	0x0040
2259 #define EXT4_DEFM_JMODE_WBACK	0x0060
2260 #define EXT4_DEFM_NOBARRIER	0x0100
2261 #define EXT4_DEFM_BLOCK_VALIDITY 0x0200
2262 #define EXT4_DEFM_DISCARD	0x0400
2263 #define EXT4_DEFM_NODELALLOC	0x0800
2264 
2265 /*
2266  * Default journal batch times
2267  */
2268 #define EXT4_DEF_MIN_BATCH_TIME	0
2269 #define EXT4_DEF_MAX_BATCH_TIME	15000 /* 15ms */
2270 
2271 /*
2272  * Minimum number of groups in a flexgroup before we separate out
2273  * directories into the first block group of a flexgroup
2274  */
2275 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME	4
2276 
2277 /*
2278  * Structure of a directory entry
2279  */
2280 #define EXT4_NAME_LEN 255
2281 /*
2282  * Base length of the ext4 directory entry excluding the name length
2283  */
2284 #define EXT4_BASE_DIR_LEN (sizeof(struct ext4_dir_entry_2) - EXT4_NAME_LEN)
2285 
2286 struct ext4_dir_entry {
2287 	__le32	inode;			/* Inode number */
2288 	__le16	rec_len;		/* Directory entry length */
2289 	__le16	name_len;		/* Name length */
2290 	char	name[EXT4_NAME_LEN];	/* File name */
2291 };
2292 
2293 
2294 /*
2295  * Encrypted Casefolded entries require saving the hash on disk. This structure
2296  * followed ext4_dir_entry_2's name[name_len] at the next 4 byte aligned
2297  * boundary.
2298  */
2299 struct ext4_dir_entry_hash {
2300 	__le32 hash;
2301 	__le32 minor_hash;
2302 };
2303 
2304 /*
2305  * The new version of the directory entry.  Since EXT4 structures are
2306  * stored in intel byte order, and the name_len field could never be
2307  * bigger than 255 chars, it's safe to reclaim the extra byte for the
2308  * file_type field.
2309  */
2310 struct ext4_dir_entry_2 {
2311 	__le32	inode;			/* Inode number */
2312 	__le16	rec_len;		/* Directory entry length */
2313 	__u8	name_len;		/* Name length */
2314 	__u8	file_type;		/* See file type macros EXT4_FT_* below */
2315 	char	name[EXT4_NAME_LEN];	/* File name */
2316 };
2317 
2318 /*
2319  * Access the hashes at the end of ext4_dir_entry_2
2320  */
2321 #define EXT4_DIRENT_HASHES(entry) \
2322 	((struct ext4_dir_entry_hash *) \
2323 		(((void *)(entry)) + \
2324 		((8 + (entry)->name_len + EXT4_DIR_ROUND) & ~EXT4_DIR_ROUND)))
2325 #define EXT4_DIRENT_HASH(entry) le32_to_cpu(EXT4_DIRENT_HASHES(de)->hash)
2326 #define EXT4_DIRENT_MINOR_HASH(entry) \
2327 		le32_to_cpu(EXT4_DIRENT_HASHES(de)->minor_hash)
2328 
ext4_hash_in_dirent(const struct inode * inode)2329 static inline bool ext4_hash_in_dirent(const struct inode *inode)
2330 {
2331 	return IS_CASEFOLDED(inode) && IS_ENCRYPTED(inode);
2332 }
2333 
2334 /*
2335  * This is a bogus directory entry at the end of each leaf block that
2336  * records checksums.
2337  */
2338 struct ext4_dir_entry_tail {
2339 	__le32	det_reserved_zero1;	/* Pretend to be unused */
2340 	__le16	det_rec_len;		/* 12 */
2341 	__u8	det_reserved_zero2;	/* Zero name length */
2342 	__u8	det_reserved_ft;	/* 0xDE, fake file type */
2343 	__le32	det_checksum;		/* crc32c(uuid+inum+dirblock) */
2344 };
2345 
2346 #define EXT4_DIRENT_TAIL(block, blocksize) \
2347 	((struct ext4_dir_entry_tail *)(((void *)(block)) + \
2348 					((blocksize) - \
2349 					 sizeof(struct ext4_dir_entry_tail))))
2350 
2351 /*
2352  * Ext4 directory file types.  Only the low 3 bits are used.  The
2353  * other bits are reserved for now.
2354  */
2355 #define EXT4_FT_UNKNOWN		0
2356 #define EXT4_FT_REG_FILE	1
2357 #define EXT4_FT_DIR		2
2358 #define EXT4_FT_CHRDEV		3
2359 #define EXT4_FT_BLKDEV		4
2360 #define EXT4_FT_FIFO		5
2361 #define EXT4_FT_SOCK		6
2362 #define EXT4_FT_SYMLINK		7
2363 
2364 #define EXT4_FT_MAX		8
2365 
2366 #define EXT4_FT_DIR_CSUM	0xDE
2367 
2368 /*
2369  * EXT4_DIR_PAD defines the directory entries boundaries
2370  *
2371  * NOTE: It must be a multiple of 4
2372  */
2373 #define EXT4_DIR_PAD			4
2374 #define EXT4_DIR_ROUND			(EXT4_DIR_PAD - 1)
2375 #define EXT4_MAX_REC_LEN		((1<<16)-1)
2376 
2377 /*
2378  * The rec_len is dependent on the type of directory. Directories that are
2379  * casefolded and encrypted need to store the hash as well, so we add room for
2380  * ext4_extended_dir_entry_2. For all entries related to '.' or '..' you should
2381  * pass NULL for dir, as those entries do not use the extra fields.
2382  */
ext4_dir_rec_len(__u8 name_len,const struct inode * dir)2383 static inline unsigned int ext4_dir_rec_len(__u8 name_len,
2384 						const struct inode *dir)
2385 {
2386 	int rec_len = (name_len + 8 + EXT4_DIR_ROUND);
2387 
2388 	if (dir && ext4_hash_in_dirent(dir))
2389 		rec_len += sizeof(struct ext4_dir_entry_hash);
2390 	return (rec_len & ~EXT4_DIR_ROUND);
2391 }
2392 
2393 /*
2394  * If we ever get support for fs block sizes > page_size, we'll need
2395  * to remove the #if statements in the next two functions...
2396  */
2397 static inline unsigned int
ext4_rec_len_from_disk(__le16 dlen,unsigned blocksize)2398 ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize)
2399 {
2400 	unsigned len = le16_to_cpu(dlen);
2401 
2402 #if (PAGE_SIZE >= 65536)
2403 	if (len == EXT4_MAX_REC_LEN || len == 0)
2404 		return blocksize;
2405 	return (len & 65532) | ((len & 3) << 16);
2406 #else
2407 	return len;
2408 #endif
2409 }
2410 
ext4_rec_len_to_disk(unsigned len,unsigned blocksize)2411 static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize)
2412 {
2413 	BUG_ON((len > blocksize) || (blocksize > (1 << 18)) || (len & 3));
2414 #if (PAGE_SIZE >= 65536)
2415 	if (len < 65536)
2416 		return cpu_to_le16(len);
2417 	if (len == blocksize) {
2418 		if (blocksize == 65536)
2419 			return cpu_to_le16(EXT4_MAX_REC_LEN);
2420 		else
2421 			return cpu_to_le16(0);
2422 	}
2423 	return cpu_to_le16((len & 65532) | ((len >> 16) & 3));
2424 #else
2425 	return cpu_to_le16(len);
2426 #endif
2427 }
2428 
2429 /*
2430  * Hash Tree Directory indexing
2431  * (c) Daniel Phillips, 2001
2432  */
2433 
2434 #define is_dx(dir) (ext4_has_feature_dir_index((dir)->i_sb) && \
2435 		    ext4_test_inode_flag((dir), EXT4_INODE_INDEX))
2436 #define EXT4_DIR_LINK_MAX(dir) unlikely((dir)->i_nlink >= EXT4_LINK_MAX && \
2437 		    !(ext4_has_feature_dir_nlink((dir)->i_sb) && is_dx(dir)))
2438 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
2439 
2440 /* Legal values for the dx_root hash_version field: */
2441 
2442 #define DX_HASH_LEGACY			0
2443 #define DX_HASH_HALF_MD4		1
2444 #define DX_HASH_TEA			2
2445 #define DX_HASH_LEGACY_UNSIGNED		3
2446 #define DX_HASH_HALF_MD4_UNSIGNED	4
2447 #define DX_HASH_TEA_UNSIGNED		5
2448 #define DX_HASH_SIPHASH			6
2449 
ext4_chksum(struct ext4_sb_info * sbi,u32 crc,const void * address,unsigned int length)2450 static inline u32 ext4_chksum(struct ext4_sb_info *sbi, u32 crc,
2451 			      const void *address, unsigned int length)
2452 {
2453 	struct {
2454 		struct shash_desc shash;
2455 		char ctx[4];
2456 	} desc;
2457 
2458 	BUG_ON(crypto_shash_descsize(sbi->s_chksum_driver)!=sizeof(desc.ctx));
2459 
2460 	desc.shash.tfm = sbi->s_chksum_driver;
2461 	*(u32 *)desc.ctx = crc;
2462 
2463 	BUG_ON(crypto_shash_update(&desc.shash, address, length));
2464 
2465 	return *(u32 *)desc.ctx;
2466 }
2467 
2468 #ifdef __KERNEL__
2469 
2470 /* hash info structure used by the directory hash */
2471 struct dx_hash_info
2472 {
2473 	u32		hash;
2474 	u32		minor_hash;
2475 	int		hash_version;
2476 	u32		*seed;
2477 };
2478 
2479 
2480 /* 32 and 64 bit signed EOF for dx directories */
2481 #define EXT4_HTREE_EOF_32BIT   ((1UL  << (32 - 1)) - 1)
2482 #define EXT4_HTREE_EOF_64BIT   ((1ULL << (64 - 1)) - 1)
2483 
2484 
2485 /*
2486  * Control parameters used by ext4_htree_next_block
2487  */
2488 #define HASH_NB_ALWAYS		1
2489 
2490 struct ext4_filename {
2491 	const struct qstr *usr_fname;
2492 	struct fscrypt_str disk_name;
2493 	struct dx_hash_info hinfo;
2494 #ifdef CONFIG_FS_ENCRYPTION
2495 	struct fscrypt_str crypto_buf;
2496 #endif
2497 #if IS_ENABLED(CONFIG_UNICODE)
2498 	struct fscrypt_str cf_name;
2499 #endif
2500 };
2501 
2502 #define fname_name(p) ((p)->disk_name.name)
2503 #define fname_usr_name(p) ((p)->usr_fname->name)
2504 #define fname_len(p)  ((p)->disk_name.len)
2505 
2506 /*
2507  * Describe an inode's exact location on disk and in memory
2508  */
2509 struct ext4_iloc
2510 {
2511 	struct buffer_head *bh;
2512 	unsigned long offset;
2513 	ext4_group_t block_group;
2514 };
2515 
ext4_raw_inode(struct ext4_iloc * iloc)2516 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
2517 {
2518 	return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
2519 }
2520 
ext4_is_quota_file(struct inode * inode)2521 static inline bool ext4_is_quota_file(struct inode *inode)
2522 {
2523 	return IS_NOQUOTA(inode) &&
2524 	       !(EXT4_I(inode)->i_flags & EXT4_EA_INODE_FL);
2525 }
2526 
2527 /*
2528  * This structure is stuffed into the struct file's private_data field
2529  * for directories.  It is where we put information so that we can do
2530  * readdir operations in hash tree order.
2531  */
2532 struct dir_private_info {
2533 	struct rb_root	root;
2534 	struct rb_node	*curr_node;
2535 	struct fname	*extra_fname;
2536 	loff_t		last_pos;
2537 	__u32		curr_hash;
2538 	__u32		curr_minor_hash;
2539 	__u32		next_hash;
2540 };
2541 
2542 /* calculate the first block number of the group */
2543 static inline ext4_fsblk_t
ext4_group_first_block_no(struct super_block * sb,ext4_group_t group_no)2544 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no)
2545 {
2546 	return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
2547 		le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
2548 }
2549 
2550 /*
2551  * Special error return code only used by dx_probe() and its callers.
2552  */
2553 #define ERR_BAD_DX_DIR	(-(MAX_ERRNO - 1))
2554 
2555 /* htree levels for ext4 */
2556 #define	EXT4_HTREE_LEVEL_COMPAT	2
2557 #define	EXT4_HTREE_LEVEL	3
2558 
ext4_dir_htree_level(struct super_block * sb)2559 static inline int ext4_dir_htree_level(struct super_block *sb)
2560 {
2561 	return ext4_has_feature_largedir(sb) ?
2562 		EXT4_HTREE_LEVEL : EXT4_HTREE_LEVEL_COMPAT;
2563 }
2564 
2565 /*
2566  * Timeout and state flag for lazy initialization inode thread.
2567  */
2568 #define EXT4_DEF_LI_WAIT_MULT			10
2569 #define EXT4_DEF_LI_MAX_START_DELAY		5
2570 #define EXT4_LAZYINIT_QUIT			0x0001
2571 #define EXT4_LAZYINIT_RUNNING			0x0002
2572 
2573 /*
2574  * Lazy inode table initialization info
2575  */
2576 struct ext4_lazy_init {
2577 	unsigned long		li_state;
2578 	struct list_head	li_request_list;
2579 	struct mutex		li_list_mtx;
2580 };
2581 
2582 enum ext4_li_mode {
2583 	EXT4_LI_MODE_PREFETCH_BBITMAP,
2584 	EXT4_LI_MODE_ITABLE,
2585 };
2586 
2587 struct ext4_li_request {
2588 	struct super_block	*lr_super;
2589 	enum ext4_li_mode	lr_mode;
2590 	ext4_group_t		lr_first_not_zeroed;
2591 	ext4_group_t		lr_next_group;
2592 	struct list_head	lr_request;
2593 	unsigned long		lr_next_sched;
2594 	unsigned long		lr_timeout;
2595 };
2596 
2597 struct ext4_features {
2598 	struct kobject f_kobj;
2599 	struct completion f_kobj_unregister;
2600 };
2601 
2602 /*
2603  * This structure will be used for multiple mount protection. It will be
2604  * written into the block number saved in the s_mmp_block field in the
2605  * superblock. Programs that check MMP should assume that if
2606  * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe
2607  * to use the filesystem, regardless of how old the timestamp is.
2608  */
2609 #define EXT4_MMP_MAGIC     0x004D4D50U /* ASCII for MMP */
2610 #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */
2611 #define EXT4_MMP_SEQ_FSCK  0xE24D4D50U /* mmp_seq value when being fscked */
2612 #define EXT4_MMP_SEQ_MAX   0xE24D4D4FU /* maximum valid mmp_seq value */
2613 
2614 struct mmp_struct {
2615 	__le32	mmp_magic;		/* Magic number for MMP */
2616 	__le32	mmp_seq;		/* Sequence no. updated periodically */
2617 
2618 	/*
2619 	 * mmp_time, mmp_nodename & mmp_bdevname are only used for information
2620 	 * purposes and do not affect the correctness of the algorithm
2621 	 */
2622 	__le64	mmp_time;		/* Time last updated */
2623 	char	mmp_nodename[64];	/* Node which last updated MMP block */
2624 	char	mmp_bdevname[32];	/* Bdev which last updated MMP block */
2625 
2626 	/*
2627 	 * mmp_check_interval is used to verify if the MMP block has been
2628 	 * updated on the block device. The value is updated based on the
2629 	 * maximum time to write the MMP block during an update cycle.
2630 	 */
2631 	__le16	mmp_check_interval;
2632 
2633 	__le16	mmp_pad1;
2634 	__le32	mmp_pad2[226];
2635 	__le32	mmp_checksum;		/* crc32c(uuid+mmp_block) */
2636 };
2637 
2638 /* arguments passed to the mmp thread */
2639 struct mmpd_data {
2640 	struct buffer_head *bh; /* bh from initial read_mmp_block() */
2641 	struct super_block *sb;  /* super block of the fs */
2642 };
2643 
2644 /*
2645  * Check interval multiplier
2646  * The MMP block is written every update interval and initially checked every
2647  * update interval x the multiplier (the value is then adapted based on the
2648  * write latency). The reason is that writes can be delayed under load and we
2649  * don't want readers to incorrectly assume that the filesystem is no longer
2650  * in use.
2651  */
2652 #define EXT4_MMP_CHECK_MULT		2UL
2653 
2654 /*
2655  * Minimum interval for MMP checking in seconds.
2656  */
2657 #define EXT4_MMP_MIN_CHECK_INTERVAL	5UL
2658 
2659 /*
2660  * Maximum interval for MMP checking in seconds.
2661  */
2662 #define EXT4_MMP_MAX_CHECK_INTERVAL	300UL
2663 
2664 /*
2665  * Function prototypes
2666  */
2667 
2668 /*
2669  * Ok, these declarations are also in <linux/kernel.h> but none of the
2670  * ext4 source programs needs to include it so they are duplicated here.
2671  */
2672 # define NORET_TYPE	/**/
2673 # define ATTRIB_NORET	__attribute__((noreturn))
2674 # define NORET_AND	noreturn,
2675 
2676 /* bitmap.c */
2677 extern unsigned int ext4_count_free(char *bitmap, unsigned numchars);
2678 void ext4_inode_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
2679 				struct ext4_group_desc *gdp,
2680 				struct buffer_head *bh, int sz);
2681 int ext4_inode_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
2682 				  struct ext4_group_desc *gdp,
2683 				  struct buffer_head *bh, int sz);
2684 void ext4_block_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
2685 				struct ext4_group_desc *gdp,
2686 				struct buffer_head *bh);
2687 int ext4_block_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
2688 				  struct ext4_group_desc *gdp,
2689 				  struct buffer_head *bh);
2690 
2691 /* balloc.c */
2692 extern void ext4_get_group_no_and_offset(struct super_block *sb,
2693 					 ext4_fsblk_t blocknr,
2694 					 ext4_group_t *blockgrpp,
2695 					 ext4_grpblk_t *offsetp);
2696 extern ext4_group_t ext4_get_group_number(struct super_block *sb,
2697 					  ext4_fsblk_t block);
2698 
2699 extern unsigned int ext4_block_group(struct super_block *sb,
2700 			ext4_fsblk_t blocknr);
2701 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb,
2702 			ext4_fsblk_t blocknr);
2703 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group);
2704 extern unsigned long ext4_bg_num_gdb(struct super_block *sb,
2705 			ext4_group_t group);
2706 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,
2707 					 ext4_fsblk_t goal,
2708 					 unsigned int flags,
2709 					 unsigned long *count,
2710 					 int *errp);
2711 extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi,
2712 				    s64 nclusters, unsigned int flags);
2713 extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *);
2714 extern void ext4_check_blocks_bitmap(struct super_block *);
2715 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
2716 						    ext4_group_t block_group,
2717 						    struct buffer_head ** bh);
2718 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
2719 
2720 extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb,
2721 						ext4_group_t block_group,
2722 						bool ignore_locked);
2723 extern int ext4_wait_block_bitmap(struct super_block *sb,
2724 				  ext4_group_t block_group,
2725 				  struct buffer_head *bh);
2726 extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb,
2727 						  ext4_group_t block_group);
2728 extern unsigned ext4_free_clusters_after_init(struct super_block *sb,
2729 					      ext4_group_t block_group,
2730 					      struct ext4_group_desc *gdp);
2731 ext4_fsblk_t ext4_inode_to_goal_block(struct inode *);
2732 
2733 #if IS_ENABLED(CONFIG_UNICODE)
2734 extern int ext4_fname_setup_ci_filename(struct inode *dir,
2735 					 const struct qstr *iname,
2736 					 struct ext4_filename *fname);
2737 #endif
2738 
2739 /* ext4 encryption related stuff goes here crypto.c */
2740 #ifdef CONFIG_FS_ENCRYPTION
2741 extern const struct fscrypt_operations ext4_cryptops;
2742 
2743 int ext4_fname_setup_filename(struct inode *dir, const struct qstr *iname,
2744 			      int lookup, struct ext4_filename *fname);
2745 
2746 int ext4_fname_prepare_lookup(struct inode *dir, struct dentry *dentry,
2747 			      struct ext4_filename *fname);
2748 
2749 void ext4_fname_free_filename(struct ext4_filename *fname);
2750 
2751 int ext4_ioctl_get_encryption_pwsalt(struct file *filp, void __user *arg);
2752 
2753 #else /* !CONFIG_FS_ENCRYPTION */
ext4_fname_setup_filename(struct inode * dir,const struct qstr * iname,int lookup,struct ext4_filename * fname)2754 static inline int ext4_fname_setup_filename(struct inode *dir,
2755 					    const struct qstr *iname,
2756 					    int lookup,
2757 					    struct ext4_filename *fname)
2758 {
2759 	int err = 0;
2760 	fname->usr_fname = iname;
2761 	fname->disk_name.name = (unsigned char *) iname->name;
2762 	fname->disk_name.len = iname->len;
2763 
2764 #if IS_ENABLED(CONFIG_UNICODE)
2765 	err = ext4_fname_setup_ci_filename(dir, iname, fname);
2766 #endif
2767 
2768 	return err;
2769 }
2770 
ext4_fname_prepare_lookup(struct inode * dir,struct dentry * dentry,struct ext4_filename * fname)2771 static inline int ext4_fname_prepare_lookup(struct inode *dir,
2772 					    struct dentry *dentry,
2773 					    struct ext4_filename *fname)
2774 {
2775 	return ext4_fname_setup_filename(dir, &dentry->d_name, 1, fname);
2776 }
2777 
ext4_fname_free_filename(struct ext4_filename * fname)2778 static inline void ext4_fname_free_filename(struct ext4_filename *fname)
2779 {
2780 #if IS_ENABLED(CONFIG_UNICODE)
2781 	kfree(fname->cf_name.name);
2782 	fname->cf_name.name = NULL;
2783 #endif
2784 }
2785 
ext4_ioctl_get_encryption_pwsalt(struct file * filp,void __user * arg)2786 static inline int ext4_ioctl_get_encryption_pwsalt(struct file *filp,
2787 						   void __user *arg)
2788 {
2789 	return -EOPNOTSUPP;
2790 }
2791 #endif /* !CONFIG_FS_ENCRYPTION */
2792 
2793 /* dir.c */
2794 extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *,
2795 				  struct file *,
2796 				  struct ext4_dir_entry_2 *,
2797 				  struct buffer_head *, char *, int,
2798 				  unsigned int);
2799 #define ext4_check_dir_entry(dir, filp, de, bh, buf, size, offset) \
2800 	unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \
2801 				(de), (bh), (buf), (size), (offset)))
2802 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
2803 				__u32 minor_hash,
2804 				struct ext4_dir_entry_2 *dirent,
2805 				struct fscrypt_str *ent_name);
2806 extern void ext4_htree_free_dir_info(struct dir_private_info *p);
2807 extern int ext4_find_dest_de(struct inode *dir, struct inode *inode,
2808 			     struct buffer_head *bh,
2809 			     void *buf, int buf_size,
2810 			     struct ext4_filename *fname,
2811 			     struct ext4_dir_entry_2 **dest_de);
2812 void ext4_insert_dentry(struct inode *dir, struct inode *inode,
2813 			struct ext4_dir_entry_2 *de,
2814 			int buf_size,
2815 			struct ext4_filename *fname);
ext4_update_dx_flag(struct inode * inode)2816 static inline void ext4_update_dx_flag(struct inode *inode)
2817 {
2818 	if (!ext4_has_feature_dir_index(inode->i_sb) &&
2819 	    ext4_test_inode_flag(inode, EXT4_INODE_INDEX)) {
2820 		/* ext4_iget() should have caught this... */
2821 		WARN_ON_ONCE(ext4_has_feature_metadata_csum(inode->i_sb));
2822 		ext4_clear_inode_flag(inode, EXT4_INODE_INDEX);
2823 	}
2824 }
2825 static const unsigned char ext4_filetype_table[] = {
2826 	DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK
2827 };
2828 
get_dtype(struct super_block * sb,int filetype)2829 static inline  unsigned char get_dtype(struct super_block *sb, int filetype)
2830 {
2831 	if (!ext4_has_feature_filetype(sb) || filetype >= EXT4_FT_MAX)
2832 		return DT_UNKNOWN;
2833 
2834 	return ext4_filetype_table[filetype];
2835 }
2836 extern int ext4_check_all_de(struct inode *dir, struct buffer_head *bh,
2837 			     void *buf, int buf_size);
2838 
2839 /* fsync.c */
2840 extern int ext4_sync_file(struct file *, loff_t, loff_t, int);
2841 
2842 /* hash.c */
2843 extern int ext4fs_dirhash(const struct inode *dir, const char *name, int len,
2844 			  struct dx_hash_info *hinfo);
2845 
2846 /* ialloc.c */
2847 extern int ext4_mark_inode_used(struct super_block *sb, int ino);
2848 extern struct inode *__ext4_new_inode(struct user_namespace *, handle_t *,
2849 				      struct inode *, umode_t,
2850 				      const struct qstr *qstr, __u32 goal,
2851 				      uid_t *owner, __u32 i_flags,
2852 				      int handle_type, unsigned int line_no,
2853 				      int nblocks);
2854 
2855 #define ext4_new_inode(handle, dir, mode, qstr, goal, owner, i_flags)          \
2856 	__ext4_new_inode(&init_user_ns, (handle), (dir), (mode), (qstr),       \
2857 			 (goal), (owner), i_flags, 0, 0, 0)
2858 #define ext4_new_inode_start_handle(mnt_userns, dir, mode, qstr, goal, owner, \
2859 				    type, nblocks)		    \
2860 	__ext4_new_inode((mnt_userns), NULL, (dir), (mode), (qstr), (goal), (owner), \
2861 			 0, (type), __LINE__, (nblocks))
2862 
2863 
2864 extern void ext4_free_inode(handle_t *, struct inode *);
2865 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long);
2866 extern unsigned long ext4_count_free_inodes(struct super_block *);
2867 extern unsigned long ext4_count_dirs(struct super_block *);
2868 extern void ext4_check_inodes_bitmap(struct super_block *);
2869 extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap);
2870 extern int ext4_init_inode_table(struct super_block *sb,
2871 				 ext4_group_t group, int barrier);
2872 extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate);
2873 
2874 /* fast_commit.c */
2875 int ext4_fc_info_show(struct seq_file *seq, void *v);
2876 void ext4_fc_init(struct super_block *sb, journal_t *journal);
2877 void ext4_fc_init_inode(struct inode *inode);
2878 void ext4_fc_track_range(handle_t *handle, struct inode *inode, ext4_lblk_t start,
2879 			 ext4_lblk_t end);
2880 void __ext4_fc_track_unlink(handle_t *handle, struct inode *inode,
2881 	struct dentry *dentry);
2882 void __ext4_fc_track_link(handle_t *handle, struct inode *inode,
2883 	struct dentry *dentry);
2884 void ext4_fc_track_unlink(handle_t *handle, struct dentry *dentry);
2885 void ext4_fc_track_link(handle_t *handle, struct dentry *dentry);
2886 void __ext4_fc_track_create(handle_t *handle, struct inode *inode,
2887 			    struct dentry *dentry);
2888 void ext4_fc_track_create(handle_t *handle, struct dentry *dentry);
2889 void ext4_fc_track_inode(handle_t *handle, struct inode *inode);
2890 void ext4_fc_mark_ineligible(struct super_block *sb, int reason, handle_t *handle);
2891 void ext4_fc_start_update(struct inode *inode);
2892 void ext4_fc_stop_update(struct inode *inode);
2893 void ext4_fc_del(struct inode *inode);
2894 bool ext4_fc_replay_check_excluded(struct super_block *sb, ext4_fsblk_t block);
2895 void ext4_fc_replay_cleanup(struct super_block *sb);
2896 int ext4_fc_commit(journal_t *journal, tid_t commit_tid);
2897 int __init ext4_fc_init_dentry_cache(void);
2898 void ext4_fc_destroy_dentry_cache(void);
2899 int ext4_fc_record_regions(struct super_block *sb, int ino,
2900 			   ext4_lblk_t lblk, ext4_fsblk_t pblk,
2901 			   int len, int replay);
2902 
2903 /* mballoc.c */
2904 extern const struct seq_operations ext4_mb_seq_groups_ops;
2905 extern const struct seq_operations ext4_mb_seq_structs_summary_ops;
2906 extern long ext4_mb_stats;
2907 extern long ext4_mb_max_to_scan;
2908 extern int ext4_seq_mb_stats_show(struct seq_file *seq, void *offset);
2909 extern int ext4_mb_init(struct super_block *);
2910 extern int ext4_mb_release(struct super_block *);
2911 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *,
2912 				struct ext4_allocation_request *, int *);
2913 extern int ext4_mb_reserve_blocks(struct super_block *, int);
2914 extern void ext4_discard_preallocations(struct inode *, unsigned int);
2915 extern int __init ext4_init_mballoc(void);
2916 extern void ext4_exit_mballoc(void);
2917 extern ext4_group_t ext4_mb_prefetch(struct super_block *sb,
2918 				     ext4_group_t group,
2919 				     unsigned int nr, int *cnt);
2920 extern void ext4_mb_prefetch_fini(struct super_block *sb, ext4_group_t group,
2921 				  unsigned int nr);
2922 
2923 extern void ext4_free_blocks(handle_t *handle, struct inode *inode,
2924 			     struct buffer_head *bh, ext4_fsblk_t block,
2925 			     unsigned long count, int flags);
2926 extern int ext4_mb_alloc_groupinfo(struct super_block *sb,
2927 				   ext4_group_t ngroups);
2928 extern int ext4_mb_add_groupinfo(struct super_block *sb,
2929 		ext4_group_t i, struct ext4_group_desc *desc);
2930 extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb,
2931 				ext4_fsblk_t block, unsigned long count);
2932 extern int ext4_trim_fs(struct super_block *, struct fstrim_range *);
2933 extern void ext4_process_freed_data(struct super_block *sb, tid_t commit_tid);
2934 extern void ext4_mb_mark_bb(struct super_block *sb, ext4_fsblk_t block,
2935 		       int len, int state);
2936 
2937 /* inode.c */
2938 void ext4_inode_csum_set(struct inode *inode, struct ext4_inode *raw,
2939 			 struct ext4_inode_info *ei);
2940 int ext4_inode_is_fast_symlink(struct inode *inode);
2941 struct buffer_head *ext4_getblk(handle_t *, struct inode *, ext4_lblk_t, int);
2942 struct buffer_head *ext4_bread(handle_t *, struct inode *, ext4_lblk_t, int);
2943 int ext4_bread_batch(struct inode *inode, ext4_lblk_t block, int bh_count,
2944 		     bool wait, struct buffer_head **bhs);
2945 int ext4_get_block_unwritten(struct inode *inode, sector_t iblock,
2946 			     struct buffer_head *bh_result, int create);
2947 int ext4_get_block(struct inode *inode, sector_t iblock,
2948 		   struct buffer_head *bh_result, int create);
2949 int ext4_da_get_block_prep(struct inode *inode, sector_t iblock,
2950 			   struct buffer_head *bh, int create);
2951 int ext4_walk_page_buffers(handle_t *handle,
2952 			   struct inode *inode,
2953 			   struct buffer_head *head,
2954 			   unsigned from,
2955 			   unsigned to,
2956 			   int *partial,
2957 			   int (*fn)(handle_t *handle, struct inode *inode,
2958 				     struct buffer_head *bh));
2959 int do_journal_get_write_access(handle_t *handle, struct inode *inode,
2960 				struct buffer_head *bh);
2961 #define FALL_BACK_TO_NONDELALLOC 1
2962 #define CONVERT_INLINE_DATA	 2
2963 
2964 typedef enum {
2965 	EXT4_IGET_NORMAL =	0,
2966 	EXT4_IGET_SPECIAL =	0x0001, /* OK to iget a system inode */
2967 	EXT4_IGET_HANDLE = 	0x0002,	/* Inode # is from a handle */
2968 	EXT4_IGET_BAD =		0x0004  /* Allow to iget a bad inode */
2969 } ext4_iget_flags;
2970 
2971 extern struct inode *__ext4_iget(struct super_block *sb, unsigned long ino,
2972 				 ext4_iget_flags flags, const char *function,
2973 				 unsigned int line);
2974 
2975 #define ext4_iget(sb, ino, flags) \
2976 	__ext4_iget((sb), (ino), (flags), __func__, __LINE__)
2977 
2978 extern int  ext4_write_inode(struct inode *, struct writeback_control *);
2979 extern int  ext4_setattr(struct user_namespace *, struct dentry *,
2980 			 struct iattr *);
2981 extern u32  ext4_dio_alignment(struct inode *inode);
2982 extern int  ext4_getattr(struct user_namespace *, const struct path *,
2983 			 struct kstat *, u32, unsigned int);
2984 extern void ext4_evict_inode(struct inode *);
2985 extern void ext4_clear_inode(struct inode *);
2986 extern int  ext4_file_getattr(struct user_namespace *, const struct path *,
2987 			      struct kstat *, u32, unsigned int);
2988 extern int  ext4_sync_inode(handle_t *, struct inode *);
2989 extern void ext4_dirty_inode(struct inode *, int);
2990 extern int ext4_change_inode_journal_flag(struct inode *, int);
2991 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
2992 extern int ext4_get_fc_inode_loc(struct super_block *sb, unsigned long ino,
2993 			  struct ext4_iloc *iloc);
2994 extern int ext4_inode_attach_jinode(struct inode *inode);
2995 extern int ext4_can_truncate(struct inode *inode);
2996 extern int ext4_truncate(struct inode *);
2997 extern int ext4_break_layouts(struct inode *);
2998 extern int ext4_punch_hole(struct file *file, loff_t offset, loff_t length);
2999 extern void ext4_set_inode_flags(struct inode *, bool init);
3000 extern int ext4_alloc_da_blocks(struct inode *inode);
3001 extern void ext4_set_aops(struct inode *inode);
3002 extern int ext4_writepage_trans_blocks(struct inode *);
3003 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks);
3004 extern int ext4_zero_partial_blocks(handle_t *handle, struct inode *inode,
3005 			     loff_t lstart, loff_t lend);
3006 extern vm_fault_t ext4_page_mkwrite(struct vm_fault *vmf);
3007 extern qsize_t *ext4_get_reserved_space(struct inode *inode);
3008 extern int ext4_get_projid(struct inode *inode, kprojid_t *projid);
3009 extern void ext4_da_release_space(struct inode *inode, int to_free);
3010 extern void ext4_da_update_reserve_space(struct inode *inode,
3011 					int used, int quota_claim);
3012 extern int ext4_issue_zeroout(struct inode *inode, ext4_lblk_t lblk,
3013 			      ext4_fsblk_t pblk, ext4_lblk_t len);
3014 
3015 /* indirect.c */
3016 extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode,
3017 				struct ext4_map_blocks *map, int flags);
3018 extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks);
3019 extern void ext4_ind_truncate(handle_t *, struct inode *inode);
3020 extern int ext4_ind_remove_space(handle_t *handle, struct inode *inode,
3021 				 ext4_lblk_t start, ext4_lblk_t end);
3022 
3023 /* ioctl.c */
3024 extern long ext4_ioctl(struct file *, unsigned int, unsigned long);
3025 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long);
3026 int ext4_fileattr_set(struct user_namespace *mnt_userns,
3027 		      struct dentry *dentry, struct fileattr *fa);
3028 int ext4_fileattr_get(struct dentry *dentry, struct fileattr *fa);
3029 extern void ext4_reset_inode_seed(struct inode *inode);
3030 int ext4_update_overhead(struct super_block *sb, bool force);
3031 
3032 /* migrate.c */
3033 extern int ext4_ext_migrate(struct inode *);
3034 extern int ext4_ind_migrate(struct inode *inode);
3035 
3036 /* namei.c */
3037 extern int ext4_init_new_dir(handle_t *handle, struct inode *dir,
3038 			     struct inode *inode);
3039 extern int ext4_dirblock_csum_verify(struct inode *inode,
3040 				     struct buffer_head *bh);
3041 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
3042 				__u32 start_minor_hash, __u32 *next_hash);
3043 extern int ext4_search_dir(struct buffer_head *bh,
3044 			   char *search_buf,
3045 			   int buf_size,
3046 			   struct inode *dir,
3047 			   struct ext4_filename *fname,
3048 			   unsigned int offset,
3049 			   struct ext4_dir_entry_2 **res_dir);
3050 extern int ext4_generic_delete_entry(struct inode *dir,
3051 				     struct ext4_dir_entry_2 *de_del,
3052 				     struct buffer_head *bh,
3053 				     void *entry_buf,
3054 				     int buf_size,
3055 				     int csum_size);
3056 extern bool ext4_empty_dir(struct inode *inode);
3057 
3058 /* resize.c */
3059 extern void ext4_kvfree_array_rcu(void *to_free);
3060 extern int ext4_group_add(struct super_block *sb,
3061 				struct ext4_new_group_data *input);
3062 extern int ext4_group_extend(struct super_block *sb,
3063 				struct ext4_super_block *es,
3064 				ext4_fsblk_t n_blocks_count);
3065 extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count);
3066 extern unsigned int ext4_list_backups(struct super_block *sb,
3067 				      unsigned int *three, unsigned int *five,
3068 				      unsigned int *seven);
3069 
3070 /* super.c */
3071 extern struct buffer_head *ext4_sb_bread(struct super_block *sb,
3072 					 sector_t block, blk_opf_t op_flags);
3073 extern struct buffer_head *ext4_sb_bread_unmovable(struct super_block *sb,
3074 						   sector_t block);
3075 extern void ext4_read_bh_nowait(struct buffer_head *bh, blk_opf_t op_flags,
3076 				bh_end_io_t *end_io);
3077 extern int ext4_read_bh(struct buffer_head *bh, blk_opf_t op_flags,
3078 			bh_end_io_t *end_io);
3079 extern int ext4_read_bh_lock(struct buffer_head *bh, blk_opf_t op_flags, bool wait);
3080 extern void ext4_sb_breadahead_unmovable(struct super_block *sb, sector_t block);
3081 extern int ext4_seq_options_show(struct seq_file *seq, void *offset);
3082 extern int ext4_calculate_overhead(struct super_block *sb);
3083 extern __le32 ext4_superblock_csum(struct super_block *sb,
3084 				   struct ext4_super_block *es);
3085 extern void ext4_superblock_csum_set(struct super_block *sb);
3086 extern int ext4_alloc_flex_bg_array(struct super_block *sb,
3087 				    ext4_group_t ngroup);
3088 extern const char *ext4_decode_error(struct super_block *sb, int errno,
3089 				     char nbuf[16]);
3090 extern void ext4_mark_group_bitmap_corrupted(struct super_block *sb,
3091 					     ext4_group_t block_group,
3092 					     unsigned int flags);
3093 
3094 extern __printf(7, 8)
3095 void __ext4_error(struct super_block *, const char *, unsigned int, bool,
3096 		  int, __u64, const char *, ...);
3097 extern __printf(6, 7)
3098 void __ext4_error_inode(struct inode *, const char *, unsigned int,
3099 			ext4_fsblk_t, int, const char *, ...);
3100 extern __printf(5, 6)
3101 void __ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t,
3102 		     const char *, ...);
3103 extern void __ext4_std_error(struct super_block *, const char *,
3104 			     unsigned int, int);
3105 extern __printf(4, 5)
3106 void __ext4_warning(struct super_block *, const char *, unsigned int,
3107 		    const char *, ...);
3108 extern __printf(4, 5)
3109 void __ext4_warning_inode(const struct inode *inode, const char *function,
3110 			  unsigned int line, const char *fmt, ...);
3111 extern __printf(3, 4)
3112 void __ext4_msg(struct super_block *, const char *, const char *, ...);
3113 extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp,
3114 			   const char *, unsigned int, const char *);
3115 extern __printf(7, 8)
3116 void __ext4_grp_locked_error(const char *, unsigned int,
3117 			     struct super_block *, ext4_group_t,
3118 			     unsigned long, ext4_fsblk_t,
3119 			     const char *, ...);
3120 
3121 #define EXT4_ERROR_INODE(inode, fmt, a...) \
3122 	ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a)
3123 
3124 #define EXT4_ERROR_INODE_ERR(inode, err, fmt, a...)			\
3125 	__ext4_error_inode((inode), __func__, __LINE__, 0, (err), (fmt), ## a)
3126 
3127 #define ext4_error_inode_block(inode, block, err, fmt, a...)		\
3128 	__ext4_error_inode((inode), __func__, __LINE__, (block), (err),	\
3129 			   (fmt), ## a)
3130 
3131 #define EXT4_ERROR_FILE(file, block, fmt, a...)				\
3132 	ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a)
3133 
3134 #define ext4_abort(sb, err, fmt, a...)					\
3135 	__ext4_error((sb), __func__, __LINE__, true, (err), 0, (fmt), ## a)
3136 
3137 #ifdef CONFIG_PRINTK
3138 
3139 #define ext4_error_inode(inode, func, line, block, fmt, ...)		\
3140 	__ext4_error_inode(inode, func, line, block, 0, fmt, ##__VA_ARGS__)
3141 #define ext4_error_inode_err(inode, func, line, block, err, fmt, ...)	\
3142 	__ext4_error_inode((inode), (func), (line), (block), 		\
3143 			   (err), (fmt), ##__VA_ARGS__)
3144 #define ext4_error_file(file, func, line, block, fmt, ...)		\
3145 	__ext4_error_file(file, func, line, block, fmt, ##__VA_ARGS__)
3146 #define ext4_error(sb, fmt, ...)					\
3147 	__ext4_error((sb), __func__, __LINE__, false, 0, 0, (fmt),	\
3148 		##__VA_ARGS__)
3149 #define ext4_error_err(sb, err, fmt, ...)				\
3150 	__ext4_error((sb), __func__, __LINE__, false, (err), 0, (fmt),	\
3151 		##__VA_ARGS__)
3152 #define ext4_warning(sb, fmt, ...)					\
3153 	__ext4_warning(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
3154 #define ext4_warning_inode(inode, fmt, ...)				\
3155 	__ext4_warning_inode(inode, __func__, __LINE__, fmt, ##__VA_ARGS__)
3156 #define ext4_msg(sb, level, fmt, ...)				\
3157 	__ext4_msg(sb, level, fmt, ##__VA_ARGS__)
3158 #define dump_mmp_msg(sb, mmp, msg)					\
3159 	__dump_mmp_msg(sb, mmp, __func__, __LINE__, msg)
3160 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...)		\
3161 	__ext4_grp_locked_error(__func__, __LINE__, sb, grp, ino, block, \
3162 				fmt, ##__VA_ARGS__)
3163 
3164 #else
3165 
3166 #define ext4_error_inode(inode, func, line, block, fmt, ...)		\
3167 do {									\
3168 	no_printk(fmt, ##__VA_ARGS__);					\
3169 	__ext4_error_inode(inode, "", 0, block, 0, " ");		\
3170 } while (0)
3171 #define ext4_error_inode_err(inode, func, line, block, err, fmt, ...)	\
3172 do {									\
3173 	no_printk(fmt, ##__VA_ARGS__);					\
3174 	__ext4_error_inode(inode, "", 0, block, err, " ");		\
3175 } while (0)
3176 #define ext4_error_file(file, func, line, block, fmt, ...)		\
3177 do {									\
3178 	no_printk(fmt, ##__VA_ARGS__);					\
3179 	__ext4_error_file(file, "", 0, block, " ");			\
3180 } while (0)
3181 #define ext4_error(sb, fmt, ...)					\
3182 do {									\
3183 	no_printk(fmt, ##__VA_ARGS__);					\
3184 	__ext4_error(sb, "", 0, false, 0, 0, " ");			\
3185 } while (0)
3186 #define ext4_error_err(sb, err, fmt, ...)				\
3187 do {									\
3188 	no_printk(fmt, ##__VA_ARGS__);					\
3189 	__ext4_error(sb, "", 0, false, err, 0, " ");			\
3190 } while (0)
3191 #define ext4_warning(sb, fmt, ...)					\
3192 do {									\
3193 	no_printk(fmt, ##__VA_ARGS__);					\
3194 	__ext4_warning(sb, "", 0, " ");					\
3195 } while (0)
3196 #define ext4_warning_inode(inode, fmt, ...)				\
3197 do {									\
3198 	no_printk(fmt, ##__VA_ARGS__);					\
3199 	__ext4_warning_inode(inode, "", 0, " ");			\
3200 } while (0)
3201 #define ext4_msg(sb, level, fmt, ...)					\
3202 do {									\
3203 	no_printk(fmt, ##__VA_ARGS__);					\
3204 	__ext4_msg(sb, "", " ");					\
3205 } while (0)
3206 #define dump_mmp_msg(sb, mmp, msg)					\
3207 	__dump_mmp_msg(sb, mmp, "", 0, "")
3208 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...)		\
3209 do {									\
3210 	no_printk(fmt, ##__VA_ARGS__);				\
3211 	__ext4_grp_locked_error("", 0, sb, grp, ino, block, " ");	\
3212 } while (0)
3213 
3214 #endif
3215 
3216 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
3217 				      struct ext4_group_desc *bg);
3218 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
3219 				      struct ext4_group_desc *bg);
3220 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
3221 				     struct ext4_group_desc *bg);
3222 extern __u32 ext4_free_group_clusters(struct super_block *sb,
3223 				      struct ext4_group_desc *bg);
3224 extern __u32 ext4_free_inodes_count(struct super_block *sb,
3225 				 struct ext4_group_desc *bg);
3226 extern __u32 ext4_used_dirs_count(struct super_block *sb,
3227 				struct ext4_group_desc *bg);
3228 extern __u32 ext4_itable_unused_count(struct super_block *sb,
3229 				   struct ext4_group_desc *bg);
3230 extern void ext4_block_bitmap_set(struct super_block *sb,
3231 				  struct ext4_group_desc *bg, ext4_fsblk_t blk);
3232 extern void ext4_inode_bitmap_set(struct super_block *sb,
3233 				  struct ext4_group_desc *bg, ext4_fsblk_t blk);
3234 extern void ext4_inode_table_set(struct super_block *sb,
3235 				 struct ext4_group_desc *bg, ext4_fsblk_t blk);
3236 extern void ext4_free_group_clusters_set(struct super_block *sb,
3237 					 struct ext4_group_desc *bg,
3238 					 __u32 count);
3239 extern void ext4_free_inodes_set(struct super_block *sb,
3240 				struct ext4_group_desc *bg, __u32 count);
3241 extern void ext4_used_dirs_set(struct super_block *sb,
3242 				struct ext4_group_desc *bg, __u32 count);
3243 extern void ext4_itable_unused_set(struct super_block *sb,
3244 				   struct ext4_group_desc *bg, __u32 count);
3245 extern int ext4_group_desc_csum_verify(struct super_block *sb, __u32 group,
3246 				       struct ext4_group_desc *gdp);
3247 extern void ext4_group_desc_csum_set(struct super_block *sb, __u32 group,
3248 				     struct ext4_group_desc *gdp);
3249 extern int ext4_register_li_request(struct super_block *sb,
3250 				    ext4_group_t first_not_zeroed);
3251 
ext4_has_metadata_csum(struct super_block * sb)3252 static inline int ext4_has_metadata_csum(struct super_block *sb)
3253 {
3254 	WARN_ON_ONCE(ext4_has_feature_metadata_csum(sb) &&
3255 		     !EXT4_SB(sb)->s_chksum_driver);
3256 
3257 	return ext4_has_feature_metadata_csum(sb) &&
3258 	       (EXT4_SB(sb)->s_chksum_driver != NULL);
3259 }
3260 
ext4_has_group_desc_csum(struct super_block * sb)3261 static inline int ext4_has_group_desc_csum(struct super_block *sb)
3262 {
3263 	return ext4_has_feature_gdt_csum(sb) || ext4_has_metadata_csum(sb);
3264 }
3265 
3266 #define ext4_read_incompat_64bit_val(es, name) \
3267 	(((es)->s_feature_incompat & cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT) \
3268 		? (ext4_fsblk_t)le32_to_cpu(es->name##_hi) << 32 : 0) | \
3269 		le32_to_cpu(es->name##_lo))
3270 
ext4_blocks_count(struct ext4_super_block * es)3271 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
3272 {
3273 	return ext4_read_incompat_64bit_val(es, s_blocks_count);
3274 }
3275 
ext4_r_blocks_count(struct ext4_super_block * es)3276 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
3277 {
3278 	return ext4_read_incompat_64bit_val(es, s_r_blocks_count);
3279 }
3280 
ext4_free_blocks_count(struct ext4_super_block * es)3281 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
3282 {
3283 	return ext4_read_incompat_64bit_val(es, s_free_blocks_count);
3284 }
3285 
ext4_blocks_count_set(struct ext4_super_block * es,ext4_fsblk_t blk)3286 static inline void ext4_blocks_count_set(struct ext4_super_block *es,
3287 					 ext4_fsblk_t blk)
3288 {
3289 	es->s_blocks_count_lo = cpu_to_le32((u32)blk);
3290 	es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
3291 }
3292 
ext4_free_blocks_count_set(struct ext4_super_block * es,ext4_fsblk_t blk)3293 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
3294 					      ext4_fsblk_t blk)
3295 {
3296 	es->s_free_blocks_count_lo = cpu_to_le32((u32)blk);
3297 	es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
3298 }
3299 
ext4_r_blocks_count_set(struct ext4_super_block * es,ext4_fsblk_t blk)3300 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
3301 					   ext4_fsblk_t blk)
3302 {
3303 	es->s_r_blocks_count_lo = cpu_to_le32((u32)blk);
3304 	es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
3305 }
3306 
ext4_isize(struct super_block * sb,struct ext4_inode * raw_inode)3307 static inline loff_t ext4_isize(struct super_block *sb,
3308 				struct ext4_inode *raw_inode)
3309 {
3310 	if (ext4_has_feature_largedir(sb) ||
3311 	    S_ISREG(le16_to_cpu(raw_inode->i_mode)))
3312 		return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) |
3313 			le32_to_cpu(raw_inode->i_size_lo);
3314 
3315 	return (loff_t) le32_to_cpu(raw_inode->i_size_lo);
3316 }
3317 
ext4_isize_set(struct ext4_inode * raw_inode,loff_t i_size)3318 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size)
3319 {
3320 	raw_inode->i_size_lo = cpu_to_le32(i_size);
3321 	raw_inode->i_size_high = cpu_to_le32(i_size >> 32);
3322 }
3323 
3324 static inline
ext4_get_group_info(struct super_block * sb,ext4_group_t group)3325 struct ext4_group_info *ext4_get_group_info(struct super_block *sb,
3326 					    ext4_group_t group)
3327 {
3328 	 struct ext4_group_info **grp_info;
3329 	 long indexv, indexh;
3330 	 BUG_ON(group >= EXT4_SB(sb)->s_groups_count);
3331 	 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb));
3332 	 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1);
3333 	 grp_info = sbi_array_rcu_deref(EXT4_SB(sb), s_group_info, indexv);
3334 	 return grp_info[indexh];
3335 }
3336 
3337 /*
3338  * Reading s_groups_count requires using smp_rmb() afterwards.  See
3339  * the locking protocol documented in the comments of ext4_group_add()
3340  * in resize.c
3341  */
ext4_get_groups_count(struct super_block * sb)3342 static inline ext4_group_t ext4_get_groups_count(struct super_block *sb)
3343 {
3344 	ext4_group_t	ngroups = EXT4_SB(sb)->s_groups_count;
3345 
3346 	smp_rmb();
3347 	return ngroups;
3348 }
3349 
ext4_flex_group(struct ext4_sb_info * sbi,ext4_group_t block_group)3350 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi,
3351 					     ext4_group_t block_group)
3352 {
3353 	return block_group >> sbi->s_log_groups_per_flex;
3354 }
3355 
ext4_flex_bg_size(struct ext4_sb_info * sbi)3356 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi)
3357 {
3358 	return 1 << sbi->s_log_groups_per_flex;
3359 }
3360 
3361 #define ext4_std_error(sb, errno)				\
3362 do {								\
3363 	if ((errno))						\
3364 		__ext4_std_error((sb), __func__, __LINE__, (errno));	\
3365 } while (0)
3366 
3367 #ifdef CONFIG_SMP
3368 /* Each CPU can accumulate percpu_counter_batch clusters in their local
3369  * counters. So we need to make sure we have free clusters more
3370  * than percpu_counter_batch  * nr_cpu_ids. Also add a window of 4 times.
3371  */
3372 #define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids))
3373 #else
3374 #define EXT4_FREECLUSTERS_WATERMARK 0
3375 #endif
3376 
3377 /* Update i_disksize. Requires i_rwsem to avoid races with truncate */
ext4_update_i_disksize(struct inode * inode,loff_t newsize)3378 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize)
3379 {
3380 	WARN_ON_ONCE(S_ISREG(inode->i_mode) &&
3381 		     !inode_is_locked(inode));
3382 	down_write(&EXT4_I(inode)->i_data_sem);
3383 	if (newsize > EXT4_I(inode)->i_disksize)
3384 		WRITE_ONCE(EXT4_I(inode)->i_disksize, newsize);
3385 	up_write(&EXT4_I(inode)->i_data_sem);
3386 }
3387 
3388 /* Update i_size, i_disksize. Requires i_rwsem to avoid races with truncate */
ext4_update_inode_size(struct inode * inode,loff_t newsize)3389 static inline int ext4_update_inode_size(struct inode *inode, loff_t newsize)
3390 {
3391 	int changed = 0;
3392 
3393 	if (newsize > inode->i_size) {
3394 		i_size_write(inode, newsize);
3395 		changed = 1;
3396 	}
3397 	if (newsize > EXT4_I(inode)->i_disksize) {
3398 		ext4_update_i_disksize(inode, newsize);
3399 		changed |= 2;
3400 	}
3401 	return changed;
3402 }
3403 
3404 int ext4_update_disksize_before_punch(struct inode *inode, loff_t offset,
3405 				      loff_t len);
3406 
3407 struct ext4_group_info {
3408 	unsigned long   bb_state;
3409 #ifdef AGGRESSIVE_CHECK
3410 	unsigned long	bb_check_counter;
3411 #endif
3412 	struct rb_root  bb_free_root;
3413 	ext4_grpblk_t	bb_first_free;	/* first free block */
3414 	ext4_grpblk_t	bb_free;	/* total free blocks */
3415 	ext4_grpblk_t	bb_fragments;	/* nr of freespace fragments */
3416 	int		bb_avg_fragment_size_order;	/* order of average
3417 							   fragment in BG */
3418 	ext4_grpblk_t	bb_largest_free_order;/* order of largest frag in BG */
3419 	ext4_group_t	bb_group;	/* Group number */
3420 	struct          list_head bb_prealloc_list;
3421 #ifdef DOUBLE_CHECK
3422 	void            *bb_bitmap;
3423 #endif
3424 	struct rw_semaphore alloc_sem;
3425 	struct list_head bb_avg_fragment_size_node;
3426 	struct list_head bb_largest_free_order_node;
3427 	ext4_grpblk_t	bb_counters[];	/* Nr of free power-of-two-block
3428 					 * regions, index is order.
3429 					 * bb_counters[3] = 5 means
3430 					 * 5 free 8-block regions. */
3431 };
3432 
3433 #define EXT4_GROUP_INFO_NEED_INIT_BIT		0
3434 #define EXT4_GROUP_INFO_WAS_TRIMMED_BIT		1
3435 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT	2
3436 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT	3
3437 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT		\
3438 	(1 << EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT)
3439 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT		\
3440 	(1 << EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT)
3441 #define EXT4_GROUP_INFO_BBITMAP_READ_BIT	4
3442 
3443 #define EXT4_MB_GRP_NEED_INIT(grp)	\
3444 	(test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state)))
3445 #define EXT4_MB_GRP_BBITMAP_CORRUPT(grp)	\
3446 	(test_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &((grp)->bb_state)))
3447 #define EXT4_MB_GRP_IBITMAP_CORRUPT(grp)	\
3448 	(test_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &((grp)->bb_state)))
3449 
3450 #define EXT4_MB_GRP_WAS_TRIMMED(grp)	\
3451 	(test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
3452 #define EXT4_MB_GRP_SET_TRIMMED(grp)	\
3453 	(set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
3454 #define EXT4_MB_GRP_CLEAR_TRIMMED(grp)	\
3455 	(clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
3456 #define EXT4_MB_GRP_TEST_AND_SET_READ(grp)	\
3457 	(test_and_set_bit(EXT4_GROUP_INFO_BBITMAP_READ_BIT, &((grp)->bb_state)))
3458 
3459 #define EXT4_MAX_CONTENTION		8
3460 #define EXT4_CONTENTION_THRESHOLD	2
3461 
ext4_group_lock_ptr(struct super_block * sb,ext4_group_t group)3462 static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb,
3463 					      ext4_group_t group)
3464 {
3465 	return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group);
3466 }
3467 
3468 /*
3469  * Returns true if the filesystem is busy enough that attempts to
3470  * access the block group locks has run into contention.
3471  */
ext4_fs_is_busy(struct ext4_sb_info * sbi)3472 static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi)
3473 {
3474 	return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD);
3475 }
3476 
ext4_lock_group(struct super_block * sb,ext4_group_t group)3477 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group)
3478 {
3479 	spinlock_t *lock = ext4_group_lock_ptr(sb, group);
3480 	if (spin_trylock(lock))
3481 		/*
3482 		 * We're able to grab the lock right away, so drop the
3483 		 * lock contention counter.
3484 		 */
3485 		atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0);
3486 	else {
3487 		/*
3488 		 * The lock is busy, so bump the contention counter,
3489 		 * and then wait on the spin lock.
3490 		 */
3491 		atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1,
3492 				  EXT4_MAX_CONTENTION);
3493 		spin_lock(lock);
3494 	}
3495 }
3496 
ext4_unlock_group(struct super_block * sb,ext4_group_t group)3497 static inline void ext4_unlock_group(struct super_block *sb,
3498 					ext4_group_t group)
3499 {
3500 	spin_unlock(ext4_group_lock_ptr(sb, group));
3501 }
3502 
3503 #ifdef CONFIG_QUOTA
ext4_quota_capable(struct super_block * sb)3504 static inline bool ext4_quota_capable(struct super_block *sb)
3505 {
3506 	return (test_opt(sb, QUOTA) || ext4_has_feature_quota(sb));
3507 }
3508 
ext4_is_quota_journalled(struct super_block * sb)3509 static inline bool ext4_is_quota_journalled(struct super_block *sb)
3510 {
3511 	struct ext4_sb_info *sbi = EXT4_SB(sb);
3512 
3513 	return (ext4_has_feature_quota(sb) ||
3514 		sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]);
3515 }
3516 int ext4_enable_quotas(struct super_block *sb);
3517 #endif
3518 
3519 /*
3520  * Block validity checking
3521  */
3522 #define ext4_check_indirect_blockref(inode, bh)				\
3523 	ext4_check_blockref(__func__, __LINE__, inode,			\
3524 			    (__le32 *)(bh)->b_data,			\
3525 			    EXT4_ADDR_PER_BLOCK((inode)->i_sb))
3526 
3527 #define ext4_ind_check_inode(inode)					\
3528 	ext4_check_blockref(__func__, __LINE__, inode,			\
3529 			    EXT4_I(inode)->i_data,			\
3530 			    EXT4_NDIR_BLOCKS)
3531 
3532 /*
3533  * Inodes and files operations
3534  */
3535 
3536 /* dir.c */
3537 extern const struct file_operations ext4_dir_operations;
3538 
3539 /* file.c */
3540 extern const struct inode_operations ext4_file_inode_operations;
3541 extern const struct file_operations ext4_file_operations;
3542 extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin);
3543 
3544 /* inline.c */
3545 extern int ext4_get_max_inline_size(struct inode *inode);
3546 extern int ext4_find_inline_data_nolock(struct inode *inode);
3547 extern int ext4_init_inline_data(handle_t *handle, struct inode *inode,
3548 				 unsigned int len);
3549 extern int ext4_destroy_inline_data(handle_t *handle, struct inode *inode);
3550 
3551 extern int ext4_readpage_inline(struct inode *inode, struct page *page);
3552 extern int ext4_try_to_write_inline_data(struct address_space *mapping,
3553 					 struct inode *inode,
3554 					 loff_t pos, unsigned len,
3555 					 struct page **pagep);
3556 extern int ext4_write_inline_data_end(struct inode *inode,
3557 				      loff_t pos, unsigned len,
3558 				      unsigned copied,
3559 				      struct page *page);
3560 extern struct buffer_head *
3561 ext4_journalled_write_inline_data(struct inode *inode,
3562 				  unsigned len,
3563 				  struct page *page);
3564 extern int ext4_da_write_inline_data_begin(struct address_space *mapping,
3565 					   struct inode *inode,
3566 					   loff_t pos, unsigned len,
3567 					   struct page **pagep,
3568 					   void **fsdata);
3569 extern int ext4_try_add_inline_entry(handle_t *handle,
3570 				     struct ext4_filename *fname,
3571 				     struct inode *dir, struct inode *inode);
3572 extern int ext4_try_create_inline_dir(handle_t *handle,
3573 				      struct inode *parent,
3574 				      struct inode *inode);
3575 extern int ext4_read_inline_dir(struct file *filp,
3576 				struct dir_context *ctx,
3577 				int *has_inline_data);
3578 extern int ext4_inlinedir_to_tree(struct file *dir_file,
3579 				  struct inode *dir, ext4_lblk_t block,
3580 				  struct dx_hash_info *hinfo,
3581 				  __u32 start_hash, __u32 start_minor_hash,
3582 				  int *has_inline_data);
3583 extern struct buffer_head *ext4_find_inline_entry(struct inode *dir,
3584 					struct ext4_filename *fname,
3585 					struct ext4_dir_entry_2 **res_dir,
3586 					int *has_inline_data);
3587 extern int ext4_delete_inline_entry(handle_t *handle,
3588 				    struct inode *dir,
3589 				    struct ext4_dir_entry_2 *de_del,
3590 				    struct buffer_head *bh,
3591 				    int *has_inline_data);
3592 extern bool empty_inline_dir(struct inode *dir, int *has_inline_data);
3593 extern struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
3594 					struct ext4_dir_entry_2 **parent_de,
3595 					int *retval);
3596 extern void *ext4_read_inline_link(struct inode *inode);
3597 
3598 struct iomap;
3599 extern int ext4_inline_data_iomap(struct inode *inode, struct iomap *iomap);
3600 
3601 extern int ext4_inline_data_truncate(struct inode *inode, int *has_inline);
3602 
3603 extern int ext4_convert_inline_data(struct inode *inode);
3604 
ext4_has_inline_data(struct inode * inode)3605 static inline int ext4_has_inline_data(struct inode *inode)
3606 {
3607 	return ext4_test_inode_flag(inode, EXT4_INODE_INLINE_DATA) &&
3608 	       EXT4_I(inode)->i_inline_off;
3609 }
3610 
3611 /* namei.c */
3612 extern const struct inode_operations ext4_dir_inode_operations;
3613 extern const struct inode_operations ext4_special_inode_operations;
3614 extern struct dentry *ext4_get_parent(struct dentry *child);
3615 extern struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode,
3616 				 struct ext4_dir_entry_2 *de,
3617 				 int blocksize, int csum_size,
3618 				 unsigned int parent_ino, int dotdot_real_len);
3619 extern void ext4_initialize_dirent_tail(struct buffer_head *bh,
3620 					unsigned int blocksize);
3621 extern int ext4_handle_dirty_dirblock(handle_t *handle, struct inode *inode,
3622 				      struct buffer_head *bh);
3623 extern int __ext4_unlink(struct inode *dir, const struct qstr *d_name,
3624 			 struct inode *inode, struct dentry *dentry);
3625 extern int __ext4_link(struct inode *dir, struct inode *inode,
3626 		       struct dentry *dentry);
3627 
3628 #define S_SHIFT 12
3629 static const unsigned char ext4_type_by_mode[(S_IFMT >> S_SHIFT) + 1] = {
3630 	[S_IFREG >> S_SHIFT]	= EXT4_FT_REG_FILE,
3631 	[S_IFDIR >> S_SHIFT]	= EXT4_FT_DIR,
3632 	[S_IFCHR >> S_SHIFT]	= EXT4_FT_CHRDEV,
3633 	[S_IFBLK >> S_SHIFT]	= EXT4_FT_BLKDEV,
3634 	[S_IFIFO >> S_SHIFT]	= EXT4_FT_FIFO,
3635 	[S_IFSOCK >> S_SHIFT]	= EXT4_FT_SOCK,
3636 	[S_IFLNK >> S_SHIFT]	= EXT4_FT_SYMLINK,
3637 };
3638 
ext4_set_de_type(struct super_block * sb,struct ext4_dir_entry_2 * de,umode_t mode)3639 static inline void ext4_set_de_type(struct super_block *sb,
3640 				struct ext4_dir_entry_2 *de,
3641 				umode_t mode) {
3642 	if (ext4_has_feature_filetype(sb))
3643 		de->file_type = ext4_type_by_mode[(mode & S_IFMT)>>S_SHIFT];
3644 }
3645 
3646 /* readpages.c */
3647 extern int ext4_mpage_readpages(struct inode *inode,
3648 		struct readahead_control *rac, struct page *page);
3649 extern int __init ext4_init_post_read_processing(void);
3650 extern void ext4_exit_post_read_processing(void);
3651 
3652 /* symlink.c */
3653 extern const struct inode_operations ext4_encrypted_symlink_inode_operations;
3654 extern const struct inode_operations ext4_symlink_inode_operations;
3655 extern const struct inode_operations ext4_fast_symlink_inode_operations;
3656 
3657 /* sysfs.c */
3658 extern void ext4_notify_error_sysfs(struct ext4_sb_info *sbi);
3659 extern int ext4_register_sysfs(struct super_block *sb);
3660 extern void ext4_unregister_sysfs(struct super_block *sb);
3661 extern int __init ext4_init_sysfs(void);
3662 extern void ext4_exit_sysfs(void);
3663 
3664 /* block_validity */
3665 extern void ext4_release_system_zone(struct super_block *sb);
3666 extern int ext4_setup_system_zone(struct super_block *sb);
3667 extern int __init ext4_init_system_zone(void);
3668 extern void ext4_exit_system_zone(void);
3669 extern int ext4_inode_block_valid(struct inode *inode,
3670 				  ext4_fsblk_t start_blk,
3671 				  unsigned int count);
3672 extern int ext4_check_blockref(const char *, unsigned int,
3673 			       struct inode *, __le32 *, unsigned int);
3674 extern int ext4_sb_block_valid(struct super_block *sb, struct inode *inode,
3675 				ext4_fsblk_t start_blk, unsigned int count);
3676 
3677 
3678 /* extents.c */
3679 struct ext4_ext_path;
3680 struct ext4_extent;
3681 
3682 /*
3683  * Maximum number of logical blocks in a file; ext4_extent's ee_block is
3684  * __le32.
3685  */
3686 #define EXT_MAX_BLOCKS	0xffffffff
3687 
3688 extern void ext4_ext_tree_init(handle_t *handle, struct inode *inode);
3689 extern int ext4_ext_index_trans_blocks(struct inode *inode, int extents);
3690 extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
3691 			       struct ext4_map_blocks *map, int flags);
3692 extern int ext4_ext_truncate(handle_t *, struct inode *);
3693 extern int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start,
3694 				 ext4_lblk_t end);
3695 extern void ext4_ext_init(struct super_block *);
3696 extern void ext4_ext_release(struct super_block *);
3697 extern long ext4_fallocate(struct file *file, int mode, loff_t offset,
3698 			  loff_t len);
3699 extern int ext4_convert_unwritten_extents(handle_t *handle, struct inode *inode,
3700 					  loff_t offset, ssize_t len);
3701 extern int ext4_convert_unwritten_io_end_vec(handle_t *handle,
3702 					     ext4_io_end_t *io_end);
3703 extern int ext4_map_blocks(handle_t *handle, struct inode *inode,
3704 			   struct ext4_map_blocks *map, int flags);
3705 extern int ext4_ext_calc_credits_for_single_extent(struct inode *inode,
3706 						   int num,
3707 						   struct ext4_ext_path *path);
3708 extern int ext4_ext_insert_extent(handle_t *, struct inode *,
3709 				  struct ext4_ext_path **,
3710 				  struct ext4_extent *, int);
3711 extern struct ext4_ext_path *ext4_find_extent(struct inode *, ext4_lblk_t,
3712 					      struct ext4_ext_path **,
3713 					      int flags);
3714 extern void ext4_free_ext_path(struct ext4_ext_path *);
3715 extern int ext4_ext_check_inode(struct inode *inode);
3716 extern ext4_lblk_t ext4_ext_next_allocated_block(struct ext4_ext_path *path);
3717 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
3718 			__u64 start, __u64 len);
3719 extern int ext4_get_es_cache(struct inode *inode,
3720 			     struct fiemap_extent_info *fieinfo,
3721 			     __u64 start, __u64 len);
3722 extern int ext4_ext_precache(struct inode *inode);
3723 extern int ext4_swap_extents(handle_t *handle, struct inode *inode1,
3724 				struct inode *inode2, ext4_lblk_t lblk1,
3725 			     ext4_lblk_t lblk2,  ext4_lblk_t count,
3726 			     int mark_unwritten,int *err);
3727 extern int ext4_clu_mapped(struct inode *inode, ext4_lblk_t lclu);
3728 extern int ext4_datasem_ensure_credits(handle_t *handle, struct inode *inode,
3729 				       int check_cred, int restart_cred,
3730 				       int revoke_cred);
3731 extern void ext4_ext_replay_shrink_inode(struct inode *inode, ext4_lblk_t end);
3732 extern int ext4_ext_replay_set_iblocks(struct inode *inode);
3733 extern int ext4_ext_replay_update_ex(struct inode *inode, ext4_lblk_t start,
3734 		int len, int unwritten, ext4_fsblk_t pblk);
3735 extern int ext4_ext_clear_bb(struct inode *inode);
3736 
3737 
3738 /* move_extent.c */
3739 extern void ext4_double_down_write_data_sem(struct inode *first,
3740 					    struct inode *second);
3741 extern void ext4_double_up_write_data_sem(struct inode *orig_inode,
3742 					  struct inode *donor_inode);
3743 extern int ext4_move_extents(struct file *o_filp, struct file *d_filp,
3744 			     __u64 start_orig, __u64 start_donor,
3745 			     __u64 len, __u64 *moved_len);
3746 
3747 /* page-io.c */
3748 extern int __init ext4_init_pageio(void);
3749 extern void ext4_exit_pageio(void);
3750 extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags);
3751 extern ext4_io_end_t *ext4_get_io_end(ext4_io_end_t *io_end);
3752 extern int ext4_put_io_end(ext4_io_end_t *io_end);
3753 extern void ext4_put_io_end_defer(ext4_io_end_t *io_end);
3754 extern void ext4_io_submit_init(struct ext4_io_submit *io,
3755 				struct writeback_control *wbc);
3756 extern void ext4_end_io_rsv_work(struct work_struct *work);
3757 extern void ext4_io_submit(struct ext4_io_submit *io);
3758 extern int ext4_bio_write_page(struct ext4_io_submit *io,
3759 			       struct page *page,
3760 			       int len,
3761 			       bool keep_towrite);
3762 extern struct ext4_io_end_vec *ext4_alloc_io_end_vec(ext4_io_end_t *io_end);
3763 extern struct ext4_io_end_vec *ext4_last_io_end_vec(ext4_io_end_t *io_end);
3764 
3765 /* mmp.c */
3766 extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t);
3767 
3768 /* mmp.c */
3769 extern void ext4_stop_mmpd(struct ext4_sb_info *sbi);
3770 
3771 /* verity.c */
3772 extern const struct fsverity_operations ext4_verityops;
3773 
3774 /* orphan.c */
3775 extern int ext4_orphan_add(handle_t *, struct inode *);
3776 extern int ext4_orphan_del(handle_t *, struct inode *);
3777 extern void ext4_orphan_cleanup(struct super_block *sb,
3778 				struct ext4_super_block *es);
3779 extern void ext4_release_orphan_info(struct super_block *sb);
3780 extern int ext4_init_orphan_info(struct super_block *sb);
3781 extern int ext4_orphan_file_empty(struct super_block *sb);
3782 extern void ext4_orphan_file_block_trigger(
3783 				struct jbd2_buffer_trigger_type *triggers,
3784 				struct buffer_head *bh,
3785 				void *data, size_t size);
3786 
3787 /*
3788  * Add new method to test whether block and inode bitmaps are properly
3789  * initialized. With uninit_bg reading the block from disk is not enough
3790  * to mark the bitmap uptodate. We need to also zero-out the bitmap
3791  */
3792 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart
3793 
bitmap_uptodate(struct buffer_head * bh)3794 static inline int bitmap_uptodate(struct buffer_head *bh)
3795 {
3796 	return (buffer_uptodate(bh) &&
3797 			test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state));
3798 }
set_bitmap_uptodate(struct buffer_head * bh)3799 static inline void set_bitmap_uptodate(struct buffer_head *bh)
3800 {
3801 	set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state);
3802 }
3803 
3804 #define in_range(b, first, len)	((b) >= (first) && (b) <= (first) + (len) - 1)
3805 
3806 /* For ioend & aio unwritten conversion wait queues */
3807 #define EXT4_WQ_HASH_SZ		37
3808 #define ext4_ioend_wq(v)   (&ext4__ioend_wq[((unsigned long)(v)) %\
3809 					    EXT4_WQ_HASH_SZ])
3810 extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
3811 
3812 extern int ext4_resize_begin(struct super_block *sb);
3813 extern int ext4_resize_end(struct super_block *sb, bool update_backups);
3814 
ext4_set_io_unwritten_flag(struct inode * inode,struct ext4_io_end * io_end)3815 static inline void ext4_set_io_unwritten_flag(struct inode *inode,
3816 					      struct ext4_io_end *io_end)
3817 {
3818 	if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) {
3819 		io_end->flag |= EXT4_IO_END_UNWRITTEN;
3820 		atomic_inc(&EXT4_I(inode)->i_unwritten);
3821 	}
3822 }
3823 
ext4_clear_io_unwritten_flag(ext4_io_end_t * io_end)3824 static inline void ext4_clear_io_unwritten_flag(ext4_io_end_t *io_end)
3825 {
3826 	struct inode *inode = io_end->inode;
3827 
3828 	if (io_end->flag & EXT4_IO_END_UNWRITTEN) {
3829 		io_end->flag &= ~EXT4_IO_END_UNWRITTEN;
3830 		/* Wake up anyone waiting on unwritten extent conversion */
3831 		if (atomic_dec_and_test(&EXT4_I(inode)->i_unwritten))
3832 			wake_up_all(ext4_ioend_wq(inode));
3833 	}
3834 }
3835 
3836 extern const struct iomap_ops ext4_iomap_ops;
3837 extern const struct iomap_ops ext4_iomap_overwrite_ops;
3838 extern const struct iomap_ops ext4_iomap_report_ops;
3839 
ext4_buffer_uptodate(struct buffer_head * bh)3840 static inline int ext4_buffer_uptodate(struct buffer_head *bh)
3841 {
3842 	/*
3843 	 * If the buffer has the write error flag, we have failed
3844 	 * to write out data in the block.  In this  case, we don't
3845 	 * have to read the block because we may read the old data
3846 	 * successfully.
3847 	 */
3848 	if (buffer_write_io_error(bh))
3849 		set_buffer_uptodate(bh);
3850 	return buffer_uptodate(bh);
3851 }
3852 
3853 #endif	/* __KERNEL__ */
3854 
3855 #define EFSBADCRC	EBADMSG		/* Bad CRC detected */
3856 #define EFSCORRUPTED	EUCLEAN		/* Filesystem is corrupted */
3857 
3858 #endif	/* _EXT4_H */
3859