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 /* Perform linear traversal for one group */
171 #define EXT4_MB_SEARCH_NEXT_LINEAR	0x00020000
172 struct ext4_allocation_request {
173 	/* target inode for block we're allocating */
174 	struct inode *inode;
175 	/* how many blocks we want to allocate */
176 	unsigned int len;
177 	/* logical block in target inode */
178 	ext4_lblk_t logical;
179 	/* the closest logical allocated block to the left */
180 	ext4_lblk_t lleft;
181 	/* the closest logical allocated block to the right */
182 	ext4_lblk_t lright;
183 	/* phys. target (a hint) */
184 	ext4_fsblk_t goal;
185 	/* phys. block for the closest logical allocated block to the left */
186 	ext4_fsblk_t pleft;
187 	/* phys. block for the closest logical allocated block to the right */
188 	ext4_fsblk_t pright;
189 	/* flags. see above EXT4_MB_HINT_* */
190 	unsigned int flags;
191 };
192 
193 /*
194  * Logical to physical block mapping, used by ext4_map_blocks()
195  *
196  * This structure is used to pass requests into ext4_map_blocks() as
197  * well as to store the information returned by ext4_map_blocks().  It
198  * takes less room on the stack than a struct buffer_head.
199  */
200 #define EXT4_MAP_NEW		BIT(BH_New)
201 #define EXT4_MAP_MAPPED		BIT(BH_Mapped)
202 #define EXT4_MAP_UNWRITTEN	BIT(BH_Unwritten)
203 #define EXT4_MAP_BOUNDARY	BIT(BH_Boundary)
204 #define EXT4_MAP_FLAGS		(EXT4_MAP_NEW | EXT4_MAP_MAPPED |\
205 				 EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY)
206 
207 struct ext4_map_blocks {
208 	ext4_fsblk_t m_pblk;
209 	ext4_lblk_t m_lblk;
210 	unsigned int m_len;
211 	unsigned int m_flags;
212 };
213 
214 /*
215  * Block validity checking, system zone rbtree.
216  */
217 struct ext4_system_blocks {
218 	struct rb_root root;
219 	struct rcu_head rcu;
220 };
221 
222 /*
223  * Flags for ext4_io_end->flags
224  */
225 #define	EXT4_IO_END_UNWRITTEN	0x0001
226 
227 struct ext4_io_end_vec {
228 	struct list_head list;		/* list of io_end_vec */
229 	loff_t offset;			/* offset in the file */
230 	ssize_t size;			/* size of the extent */
231 };
232 
233 /*
234  * For converting unwritten extents on a work queue. 'handle' is used for
235  * buffered writeback.
236  */
237 typedef struct ext4_io_end {
238 	struct list_head	list;		/* per-file finished IO list */
239 	handle_t		*handle;	/* handle reserved for extent
240 						 * conversion */
241 	struct inode		*inode;		/* file being written to */
242 	struct bio		*bio;		/* Linked list of completed
243 						 * bios covering the extent */
244 	unsigned int		flag;		/* unwritten or not */
245 	refcount_t		count;		/* reference counter */
246 	struct list_head	list_vec;	/* list of ext4_io_end_vec */
247 } ext4_io_end_t;
248 
249 struct ext4_io_submit {
250 	struct writeback_control *io_wbc;
251 	struct bio		*io_bio;
252 	ext4_io_end_t		*io_end;
253 	sector_t		io_next_block;
254 };
255 
256 /*
257  * Special inodes numbers
258  */
259 #define	EXT4_BAD_INO		 1	/* Bad blocks inode */
260 #define EXT4_ROOT_INO		 2	/* Root inode */
261 #define EXT4_USR_QUOTA_INO	 3	/* User quota inode */
262 #define EXT4_GRP_QUOTA_INO	 4	/* Group quota inode */
263 #define EXT4_BOOT_LOADER_INO	 5	/* Boot loader inode */
264 #define EXT4_UNDEL_DIR_INO	 6	/* Undelete directory inode */
265 #define EXT4_RESIZE_INO		 7	/* Reserved group descriptors inode */
266 #define EXT4_JOURNAL_INO	 8	/* Journal inode */
267 
268 /* First non-reserved inode for old ext4 filesystems */
269 #define EXT4_GOOD_OLD_FIRST_INO	11
270 
271 /*
272  * Maximal count of links to a file
273  */
274 #define EXT4_LINK_MAX		65000
275 
276 /*
277  * Macro-instructions used to manage several block sizes
278  */
279 #define EXT4_MIN_BLOCK_SIZE		1024
280 #define	EXT4_MAX_BLOCK_SIZE		65536
281 #define EXT4_MIN_BLOCK_LOG_SIZE		10
282 #define EXT4_MAX_BLOCK_LOG_SIZE		16
283 #define EXT4_MAX_CLUSTER_LOG_SIZE	30
284 #ifdef __KERNEL__
285 # define EXT4_BLOCK_SIZE(s)		((s)->s_blocksize)
286 #else
287 # define EXT4_BLOCK_SIZE(s)		(EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
288 #endif
289 #define	EXT4_ADDR_PER_BLOCK(s)		(EXT4_BLOCK_SIZE(s) / sizeof(__u32))
290 #define EXT4_CLUSTER_SIZE(s)		(EXT4_BLOCK_SIZE(s) << \
291 					 EXT4_SB(s)->s_cluster_bits)
292 #ifdef __KERNEL__
293 # define EXT4_BLOCK_SIZE_BITS(s)	((s)->s_blocksize_bits)
294 # define EXT4_CLUSTER_BITS(s)		(EXT4_SB(s)->s_cluster_bits)
295 #else
296 # define EXT4_BLOCK_SIZE_BITS(s)	((s)->s_log_block_size + 10)
297 #endif
298 #ifdef __KERNEL__
299 #define	EXT4_ADDR_PER_BLOCK_BITS(s)	(EXT4_SB(s)->s_addr_per_block_bits)
300 #define EXT4_INODE_SIZE(s)		(EXT4_SB(s)->s_inode_size)
301 #define EXT4_FIRST_INO(s)		(EXT4_SB(s)->s_first_ino)
302 #else
303 #define EXT4_INODE_SIZE(s)	(((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
304 				 EXT4_GOOD_OLD_INODE_SIZE : \
305 				 (s)->s_inode_size)
306 #define EXT4_FIRST_INO(s)	(((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
307 				 EXT4_GOOD_OLD_FIRST_INO : \
308 				 (s)->s_first_ino)
309 #endif
310 #define EXT4_BLOCK_ALIGN(size, blkbits)		ALIGN((size), (1 << (blkbits)))
311 #define EXT4_MAX_BLOCKS(size, offset, blkbits) \
312 	((EXT4_BLOCK_ALIGN(size + offset, blkbits) >> blkbits) - (offset >> \
313 								  blkbits))
314 
315 /* Translate a block number to a cluster number */
316 #define EXT4_B2C(sbi, blk)	((blk) >> (sbi)->s_cluster_bits)
317 /* Translate a cluster number to a block number */
318 #define EXT4_C2B(sbi, cluster)	((cluster) << (sbi)->s_cluster_bits)
319 /* Translate # of blks to # of clusters */
320 #define EXT4_NUM_B2C(sbi, blks)	(((blks) + (sbi)->s_cluster_ratio - 1) >> \
321 				 (sbi)->s_cluster_bits)
322 /* Mask out the low bits to get the starting block of the cluster */
323 #define EXT4_PBLK_CMASK(s, pblk) ((pblk) &				\
324 				  ~((ext4_fsblk_t) (s)->s_cluster_ratio - 1))
325 #define EXT4_LBLK_CMASK(s, lblk) ((lblk) &				\
326 				  ~((ext4_lblk_t) (s)->s_cluster_ratio - 1))
327 /* Fill in the low bits to get the last block of the cluster */
328 #define EXT4_LBLK_CFILL(sbi, lblk) ((lblk) |				\
329 				    ((ext4_lblk_t) (sbi)->s_cluster_ratio - 1))
330 /* Get the cluster offset */
331 #define EXT4_PBLK_COFF(s, pblk) ((pblk) &				\
332 				 ((ext4_fsblk_t) (s)->s_cluster_ratio - 1))
333 #define EXT4_LBLK_COFF(s, lblk) ((lblk) &				\
334 				 ((ext4_lblk_t) (s)->s_cluster_ratio - 1))
335 
336 /*
337  * Structure of a blocks group descriptor
338  */
339 struct ext4_group_desc
340 {
341 	__le32	bg_block_bitmap_lo;	/* Blocks bitmap block */
342 	__le32	bg_inode_bitmap_lo;	/* Inodes bitmap block */
343 	__le32	bg_inode_table_lo;	/* Inodes table block */
344 	__le16	bg_free_blocks_count_lo;/* Free blocks count */
345 	__le16	bg_free_inodes_count_lo;/* Free inodes count */
346 	__le16	bg_used_dirs_count_lo;	/* Directories count */
347 	__le16	bg_flags;		/* EXT4_BG_flags (INODE_UNINIT, etc) */
348 	__le32  bg_exclude_bitmap_lo;   /* Exclude bitmap for snapshots */
349 	__le16  bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bbitmap) LE */
350 	__le16  bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+ibitmap) LE */
351 	__le16  bg_itable_unused_lo;	/* Unused inodes count */
352 	__le16  bg_checksum;		/* crc16(sb_uuid+group+desc) */
353 	__le32	bg_block_bitmap_hi;	/* Blocks bitmap block MSB */
354 	__le32	bg_inode_bitmap_hi;	/* Inodes bitmap block MSB */
355 	__le32	bg_inode_table_hi;	/* Inodes table block MSB */
356 	__le16	bg_free_blocks_count_hi;/* Free blocks count MSB */
357 	__le16	bg_free_inodes_count_hi;/* Free inodes count MSB */
358 	__le16	bg_used_dirs_count_hi;	/* Directories count MSB */
359 	__le16  bg_itable_unused_hi;    /* Unused inodes count MSB */
360 	__le32  bg_exclude_bitmap_hi;   /* Exclude bitmap block MSB */
361 	__le16  bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bbitmap) BE */
362 	__le16  bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+ibitmap) BE */
363 	__u32   bg_reserved;
364 };
365 
366 #define EXT4_BG_INODE_BITMAP_CSUM_HI_END	\
367 	(offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \
368 	 sizeof(__le16))
369 #define EXT4_BG_BLOCK_BITMAP_CSUM_HI_END	\
370 	(offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \
371 	 sizeof(__le16))
372 
373 /*
374  * Structure of a flex block group info
375  */
376 
377 struct flex_groups {
378 	atomic64_t	free_clusters;
379 	atomic_t	free_inodes;
380 	atomic_t	used_dirs;
381 };
382 
383 #define EXT4_BG_INODE_UNINIT	0x0001 /* Inode table/bitmap not in use */
384 #define EXT4_BG_BLOCK_UNINIT	0x0002 /* Block bitmap not in use */
385 #define EXT4_BG_INODE_ZEROED	0x0004 /* On-disk itable initialized to zero */
386 
387 /*
388  * Macro-instructions used to manage group descriptors
389  */
390 #define EXT4_MIN_DESC_SIZE		32
391 #define EXT4_MIN_DESC_SIZE_64BIT	64
392 #define	EXT4_MAX_DESC_SIZE		EXT4_MIN_BLOCK_SIZE
393 #define EXT4_DESC_SIZE(s)		(EXT4_SB(s)->s_desc_size)
394 #ifdef __KERNEL__
395 # define EXT4_BLOCKS_PER_GROUP(s)	(EXT4_SB(s)->s_blocks_per_group)
396 # define EXT4_CLUSTERS_PER_GROUP(s)	(EXT4_SB(s)->s_clusters_per_group)
397 # define EXT4_DESC_PER_BLOCK(s)		(EXT4_SB(s)->s_desc_per_block)
398 # define EXT4_INODES_PER_GROUP(s)	(EXT4_SB(s)->s_inodes_per_group)
399 # define EXT4_DESC_PER_BLOCK_BITS(s)	(EXT4_SB(s)->s_desc_per_block_bits)
400 #else
401 # define EXT4_BLOCKS_PER_GROUP(s)	((s)->s_blocks_per_group)
402 # define EXT4_DESC_PER_BLOCK(s)		(EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
403 # define EXT4_INODES_PER_GROUP(s)	((s)->s_inodes_per_group)
404 #endif
405 
406 /*
407  * Constants relative to the data blocks
408  */
409 #define	EXT4_NDIR_BLOCKS		12
410 #define	EXT4_IND_BLOCK			EXT4_NDIR_BLOCKS
411 #define	EXT4_DIND_BLOCK			(EXT4_IND_BLOCK + 1)
412 #define	EXT4_TIND_BLOCK			(EXT4_DIND_BLOCK + 1)
413 #define	EXT4_N_BLOCKS			(EXT4_TIND_BLOCK + 1)
414 
415 /*
416  * Inode flags
417  */
418 #define	EXT4_SECRM_FL			0x00000001 /* Secure deletion */
419 #define	EXT4_UNRM_FL			0x00000002 /* Undelete */
420 #define	EXT4_COMPR_FL			0x00000004 /* Compress file */
421 #define EXT4_SYNC_FL			0x00000008 /* Synchronous updates */
422 #define EXT4_IMMUTABLE_FL		0x00000010 /* Immutable file */
423 #define EXT4_APPEND_FL			0x00000020 /* writes to file may only append */
424 #define EXT4_NODUMP_FL			0x00000040 /* do not dump file */
425 #define EXT4_NOATIME_FL			0x00000080 /* do not update atime */
426 /* Reserved for compression usage... */
427 #define EXT4_DIRTY_FL			0x00000100
428 #define EXT4_COMPRBLK_FL		0x00000200 /* One or more compressed clusters */
429 #define EXT4_NOCOMPR_FL			0x00000400 /* Don't compress */
430 	/* nb: was previously EXT2_ECOMPR_FL */
431 #define EXT4_ENCRYPT_FL			0x00000800 /* encrypted file */
432 /* End compression flags --- maybe not all used */
433 #define EXT4_INDEX_FL			0x00001000 /* hash-indexed directory */
434 #define EXT4_IMAGIC_FL			0x00002000 /* AFS directory */
435 #define EXT4_JOURNAL_DATA_FL		0x00004000 /* file data should be journaled */
436 #define EXT4_NOTAIL_FL			0x00008000 /* file tail should not be merged */
437 #define EXT4_DIRSYNC_FL			0x00010000 /* dirsync behaviour (directories only) */
438 #define EXT4_TOPDIR_FL			0x00020000 /* Top of directory hierarchies*/
439 #define EXT4_HUGE_FILE_FL               0x00040000 /* Set to each huge file */
440 #define EXT4_EXTENTS_FL			0x00080000 /* Inode uses extents */
441 #define EXT4_VERITY_FL			0x00100000 /* Verity protected inode */
442 #define EXT4_EA_INODE_FL	        0x00200000 /* Inode used for large EA */
443 /* 0x00400000 was formerly EXT4_EOFBLOCKS_FL */
444 
445 #define EXT4_DAX_FL			0x02000000 /* Inode is DAX */
446 
447 #define EXT4_INLINE_DATA_FL		0x10000000 /* Inode has inline data. */
448 #define EXT4_PROJINHERIT_FL		0x20000000 /* Create with parents projid */
449 #define EXT4_CASEFOLD_FL		0x40000000 /* Casefolded directory */
450 #define EXT4_RESERVED_FL		0x80000000 /* reserved for ext4 lib */
451 
452 /* User modifiable flags */
453 #define EXT4_FL_USER_MODIFIABLE		(EXT4_SECRM_FL | \
454 					 EXT4_UNRM_FL | \
455 					 EXT4_COMPR_FL | \
456 					 EXT4_SYNC_FL | \
457 					 EXT4_IMMUTABLE_FL | \
458 					 EXT4_APPEND_FL | \
459 					 EXT4_NODUMP_FL | \
460 					 EXT4_NOATIME_FL | \
461 					 EXT4_JOURNAL_DATA_FL | \
462 					 EXT4_NOTAIL_FL | \
463 					 EXT4_DIRSYNC_FL | \
464 					 EXT4_TOPDIR_FL | \
465 					 EXT4_EXTENTS_FL | \
466 					 0x00400000 /* EXT4_EOFBLOCKS_FL */ | \
467 					 EXT4_DAX_FL | \
468 					 EXT4_PROJINHERIT_FL | \
469 					 EXT4_CASEFOLD_FL)
470 
471 /* User visible flags */
472 #define EXT4_FL_USER_VISIBLE		(EXT4_FL_USER_MODIFIABLE | \
473 					 EXT4_DIRTY_FL | \
474 					 EXT4_COMPRBLK_FL | \
475 					 EXT4_NOCOMPR_FL | \
476 					 EXT4_ENCRYPT_FL | \
477 					 EXT4_INDEX_FL | \
478 					 EXT4_VERITY_FL | \
479 					 EXT4_INLINE_DATA_FL)
480 
481 /* Flags that should be inherited by new inodes from their parent. */
482 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\
483 			   EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\
484 			   EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\
485 			   EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL |\
486 			   EXT4_PROJINHERIT_FL | EXT4_CASEFOLD_FL |\
487 			   EXT4_DAX_FL)
488 
489 /* Flags that are appropriate for regular files (all but dir-specific ones). */
490 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL | EXT4_CASEFOLD_FL |\
491 			   EXT4_PROJINHERIT_FL))
492 
493 /* Flags that are appropriate for non-directories/regular files. */
494 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL)
495 
496 /* The only flags that should be swapped */
497 #define EXT4_FL_SHOULD_SWAP (EXT4_HUGE_FILE_FL | EXT4_EXTENTS_FL)
498 
499 /* Flags which are mutually exclusive to DAX */
500 #define EXT4_DAX_MUT_EXCL (EXT4_VERITY_FL | EXT4_ENCRYPT_FL |\
501 			   EXT4_JOURNAL_DATA_FL | EXT4_INLINE_DATA_FL)
502 
503 /* Mask out flags that are inappropriate for the given type of inode. */
ext4_mask_flags(umode_t mode,__u32 flags)504 static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags)
505 {
506 	if (S_ISDIR(mode))
507 		return flags;
508 	else if (S_ISREG(mode))
509 		return flags & EXT4_REG_FLMASK;
510 	else
511 		return flags & EXT4_OTHER_FLMASK;
512 }
513 
514 /*
515  * Inode flags used for atomic set/get
516  */
517 enum {
518 	EXT4_INODE_SECRM	= 0,	/* Secure deletion */
519 	EXT4_INODE_UNRM		= 1,	/* Undelete */
520 	EXT4_INODE_COMPR	= 2,	/* Compress file */
521 	EXT4_INODE_SYNC		= 3,	/* Synchronous updates */
522 	EXT4_INODE_IMMUTABLE	= 4,	/* Immutable file */
523 	EXT4_INODE_APPEND	= 5,	/* writes to file may only append */
524 	EXT4_INODE_NODUMP	= 6,	/* do not dump file */
525 	EXT4_INODE_NOATIME	= 7,	/* do not update atime */
526 /* Reserved for compression usage... */
527 	EXT4_INODE_DIRTY	= 8,
528 	EXT4_INODE_COMPRBLK	= 9,	/* One or more compressed clusters */
529 	EXT4_INODE_NOCOMPR	= 10,	/* Don't compress */
530 	EXT4_INODE_ENCRYPT	= 11,	/* Encrypted file */
531 /* End compression flags --- maybe not all used */
532 	EXT4_INODE_INDEX	= 12,	/* hash-indexed directory */
533 	EXT4_INODE_IMAGIC	= 13,	/* AFS directory */
534 	EXT4_INODE_JOURNAL_DATA	= 14,	/* file data should be journaled */
535 	EXT4_INODE_NOTAIL	= 15,	/* file tail should not be merged */
536 	EXT4_INODE_DIRSYNC	= 16,	/* dirsync behaviour (directories only) */
537 	EXT4_INODE_TOPDIR	= 17,	/* Top of directory hierarchies*/
538 	EXT4_INODE_HUGE_FILE	= 18,	/* Set to each huge file */
539 	EXT4_INODE_EXTENTS	= 19,	/* Inode uses extents */
540 	EXT4_INODE_VERITY	= 20,	/* Verity protected inode */
541 	EXT4_INODE_EA_INODE	= 21,	/* Inode used for large EA */
542 /* 22 was formerly EXT4_INODE_EOFBLOCKS */
543 	EXT4_INODE_DAX		= 25,	/* Inode is DAX */
544 	EXT4_INODE_INLINE_DATA	= 28,	/* Data in inode. */
545 	EXT4_INODE_PROJINHERIT	= 29,	/* Create with parents projid */
546 	EXT4_INODE_CASEFOLD	= 30,	/* Casefolded directory */
547 	EXT4_INODE_RESERVED	= 31,	/* reserved for ext4 lib */
548 };
549 
550 /*
551  * Since it's pretty easy to mix up bit numbers and hex values, we use a
552  * build-time check to make sure that EXT4_XXX_FL is consistent with respect to
553  * EXT4_INODE_XXX. If all is well, the macros will be dropped, so, it won't cost
554  * any extra space in the compiled kernel image, otherwise, the build will fail.
555  * It's important that these values are the same, since we are using
556  * EXT4_INODE_XXX to test for flag values, but EXT4_XXX_FL must be consistent
557  * with the values of FS_XXX_FL defined in include/linux/fs.h and the on-disk
558  * values found in ext2, ext3 and ext4 filesystems, and of course the values
559  * defined in e2fsprogs.
560  *
561  * It's not paranoia if the Murphy's Law really *is* out to get you.  :-)
562  */
563 #define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG))
564 #define CHECK_FLAG_VALUE(FLAG) BUILD_BUG_ON(!TEST_FLAG_VALUE(FLAG))
565 
ext4_check_flag_values(void)566 static inline void ext4_check_flag_values(void)
567 {
568 	CHECK_FLAG_VALUE(SECRM);
569 	CHECK_FLAG_VALUE(UNRM);
570 	CHECK_FLAG_VALUE(COMPR);
571 	CHECK_FLAG_VALUE(SYNC);
572 	CHECK_FLAG_VALUE(IMMUTABLE);
573 	CHECK_FLAG_VALUE(APPEND);
574 	CHECK_FLAG_VALUE(NODUMP);
575 	CHECK_FLAG_VALUE(NOATIME);
576 	CHECK_FLAG_VALUE(DIRTY);
577 	CHECK_FLAG_VALUE(COMPRBLK);
578 	CHECK_FLAG_VALUE(NOCOMPR);
579 	CHECK_FLAG_VALUE(ENCRYPT);
580 	CHECK_FLAG_VALUE(INDEX);
581 	CHECK_FLAG_VALUE(IMAGIC);
582 	CHECK_FLAG_VALUE(JOURNAL_DATA);
583 	CHECK_FLAG_VALUE(NOTAIL);
584 	CHECK_FLAG_VALUE(DIRSYNC);
585 	CHECK_FLAG_VALUE(TOPDIR);
586 	CHECK_FLAG_VALUE(HUGE_FILE);
587 	CHECK_FLAG_VALUE(EXTENTS);
588 	CHECK_FLAG_VALUE(VERITY);
589 	CHECK_FLAG_VALUE(EA_INODE);
590 	CHECK_FLAG_VALUE(INLINE_DATA);
591 	CHECK_FLAG_VALUE(PROJINHERIT);
592 	CHECK_FLAG_VALUE(CASEFOLD);
593 	CHECK_FLAG_VALUE(RESERVED);
594 }
595 
596 /* Used to pass group descriptor data when online resize is done */
597 struct ext4_new_group_input {
598 	__u32 group;		/* Group number for this data */
599 	__u64 block_bitmap;	/* Absolute block number of block bitmap */
600 	__u64 inode_bitmap;	/* Absolute block number of inode bitmap */
601 	__u64 inode_table;	/* Absolute block number of inode table start */
602 	__u32 blocks_count;	/* Total number of blocks in this group */
603 	__u16 reserved_blocks;	/* Number of reserved blocks in this group */
604 	__u16 unused;
605 };
606 
607 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
608 struct compat_ext4_new_group_input {
609 	u32 group;
610 	compat_u64 block_bitmap;
611 	compat_u64 inode_bitmap;
612 	compat_u64 inode_table;
613 	u32 blocks_count;
614 	u16 reserved_blocks;
615 	u16 unused;
616 };
617 #endif
618 
619 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */
620 struct ext4_new_group_data {
621 	__u32 group;
622 	__u64 block_bitmap;
623 	__u64 inode_bitmap;
624 	__u64 inode_table;
625 	__u32 blocks_count;
626 	__u16 reserved_blocks;
627 	__u16 mdata_blocks;
628 	__u32 free_clusters_count;
629 };
630 
631 /* Indexes used to index group tables in ext4_new_group_data */
632 enum {
633 	BLOCK_BITMAP = 0,	/* block bitmap */
634 	INODE_BITMAP,		/* inode bitmap */
635 	INODE_TABLE,		/* inode tables */
636 	GROUP_TABLE_COUNT,
637 };
638 
639 /*
640  * Flags used by ext4_map_blocks()
641  */
642 	/* Allocate any needed blocks and/or convert an unwritten
643 	   extent to be an initialized ext4 */
644 #define EXT4_GET_BLOCKS_CREATE			0x0001
645 	/* Request the creation of an unwritten extent */
646 #define EXT4_GET_BLOCKS_UNWRIT_EXT		0x0002
647 #define EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT	(EXT4_GET_BLOCKS_UNWRIT_EXT|\
648 						 EXT4_GET_BLOCKS_CREATE)
649 	/* Caller is from the delayed allocation writeout path
650 	 * finally doing the actual allocation of delayed blocks */
651 #define EXT4_GET_BLOCKS_DELALLOC_RESERVE	0x0004
652 	/* caller is from the direct IO path, request to creation of an
653 	unwritten extents if not allocated, split the unwritten
654 	extent if blocks has been preallocated already*/
655 #define EXT4_GET_BLOCKS_PRE_IO			0x0008
656 #define EXT4_GET_BLOCKS_CONVERT			0x0010
657 #define EXT4_GET_BLOCKS_IO_CREATE_EXT		(EXT4_GET_BLOCKS_PRE_IO|\
658 					 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT)
659 	/* Convert extent to initialized after IO complete */
660 #define EXT4_GET_BLOCKS_IO_CONVERT_EXT		(EXT4_GET_BLOCKS_CONVERT|\
661 					 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT)
662 	/* Eventual metadata allocation (due to growing extent tree)
663 	 * should not fail, so try to use reserved blocks for that.*/
664 #define EXT4_GET_BLOCKS_METADATA_NOFAIL		0x0020
665 	/* Don't normalize allocation size (used for fallocate) */
666 #define EXT4_GET_BLOCKS_NO_NORMALIZE		0x0040
667 	/* Convert written extents to unwritten */
668 #define EXT4_GET_BLOCKS_CONVERT_UNWRITTEN	0x0100
669 	/* Write zeros to newly created written extents */
670 #define EXT4_GET_BLOCKS_ZERO			0x0200
671 #define EXT4_GET_BLOCKS_CREATE_ZERO		(EXT4_GET_BLOCKS_CREATE |\
672 					EXT4_GET_BLOCKS_ZERO)
673 	/* Caller will submit data before dropping transaction handle. This
674 	 * allows jbd2 to avoid submitting data before commit. */
675 #define EXT4_GET_BLOCKS_IO_SUBMIT		0x0400
676 	/* Caller is in the atomic contex, find extent if it has been cached */
677 #define EXT4_GET_BLOCKS_CACHED_NOWAIT		0x0800
678 
679 /*
680  * The bit position of these flags must not overlap with any of the
681  * EXT4_GET_BLOCKS_*.  They are used by ext4_find_extent(),
682  * read_extent_tree_block(), ext4_split_extent_at(),
683  * ext4_ext_insert_extent(), and ext4_ext_create_new_leaf().
684  * EXT4_EX_NOCACHE is used to indicate that the we shouldn't be
685  * caching the extents when reading from the extent tree while a
686  * truncate or punch hole operation is in progress.
687  */
688 #define EXT4_EX_NOCACHE				0x40000000
689 #define EXT4_EX_FORCE_CACHE			0x20000000
690 #define EXT4_EX_NOFAIL				0x10000000
691 
692 /*
693  * Flags used by ext4_free_blocks
694  */
695 #define EXT4_FREE_BLOCKS_METADATA		0x0001
696 #define EXT4_FREE_BLOCKS_FORGET			0x0002
697 #define EXT4_FREE_BLOCKS_VALIDATED		0x0004
698 #define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE		0x0008
699 #define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER	0x0010
700 #define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER	0x0020
701 #define EXT4_FREE_BLOCKS_RERESERVE_CLUSTER      0x0040
702 
703 /*
704  * ioctl commands
705  */
706 #define	EXT4_IOC_GETVERSION		_IOR('f', 3, long)
707 #define	EXT4_IOC_SETVERSION		_IOW('f', 4, long)
708 #define	EXT4_IOC_GETVERSION_OLD		FS_IOC_GETVERSION
709 #define	EXT4_IOC_SETVERSION_OLD		FS_IOC_SETVERSION
710 #define EXT4_IOC_GETRSVSZ		_IOR('f', 5, long)
711 #define EXT4_IOC_SETRSVSZ		_IOW('f', 6, long)
712 #define EXT4_IOC_GROUP_EXTEND		_IOW('f', 7, unsigned long)
713 #define EXT4_IOC_GROUP_ADD		_IOW('f', 8, struct ext4_new_group_input)
714 #define EXT4_IOC_MIGRATE		_IO('f', 9)
715  /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */
716  /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */
717 #define EXT4_IOC_ALLOC_DA_BLKS		_IO('f', 12)
718 #define EXT4_IOC_MOVE_EXT		_IOWR('f', 15, struct move_extent)
719 #define EXT4_IOC_RESIZE_FS		_IOW('f', 16, __u64)
720 #define EXT4_IOC_SWAP_BOOT		_IO('f', 17)
721 #define EXT4_IOC_PRECACHE_EXTENTS	_IO('f', 18)
722 /* ioctl codes 19--39 are reserved for fscrypt */
723 #define EXT4_IOC_CLEAR_ES_CACHE		_IO('f', 40)
724 #define EXT4_IOC_GETSTATE		_IOW('f', 41, __u32)
725 #define EXT4_IOC_GET_ES_CACHE		_IOWR('f', 42, struct fiemap)
726 #define EXT4_IOC_CHECKPOINT		_IOW('f', 43, __u32)
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 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
757 /*
758  * ioctl commands in 32 bit emulation
759  */
760 #define EXT4_IOC32_GETVERSION		_IOR('f', 3, int)
761 #define EXT4_IOC32_SETVERSION		_IOW('f', 4, int)
762 #define EXT4_IOC32_GETRSVSZ		_IOR('f', 5, int)
763 #define EXT4_IOC32_SETRSVSZ		_IOW('f', 6, int)
764 #define EXT4_IOC32_GROUP_EXTEND		_IOW('f', 7, unsigned int)
765 #define EXT4_IOC32_GROUP_ADD		_IOW('f', 8, struct compat_ext4_new_group_input)
766 #define EXT4_IOC32_GETVERSION_OLD	FS_IOC32_GETVERSION
767 #define EXT4_IOC32_SETVERSION_OLD	FS_IOC32_SETVERSION
768 #endif
769 
770 /*
771  * Returned by EXT4_IOC_GET_ES_CACHE as an additional possible flag.
772  * It indicates that the entry in extent status cache is for a hole.
773  */
774 #define EXT4_FIEMAP_EXTENT_HOLE		0x08000000
775 
776 /* Max physical block we can address w/o extents */
777 #define EXT4_MAX_BLOCK_FILE_PHYS	0xFFFFFFFF
778 
779 /* Max logical block we can support */
780 #define EXT4_MAX_LOGICAL_BLOCK		0xFFFFFFFE
781 
782 /*
783  * Structure of an inode on the disk
784  */
785 struct ext4_inode {
786 	__le16	i_mode;		/* File mode */
787 	__le16	i_uid;		/* Low 16 bits of Owner Uid */
788 	__le32	i_size_lo;	/* Size in bytes */
789 	__le32	i_atime;	/* Access time */
790 	__le32	i_ctime;	/* Inode Change time */
791 	__le32	i_mtime;	/* Modification time */
792 	__le32	i_dtime;	/* Deletion Time */
793 	__le16	i_gid;		/* Low 16 bits of Group Id */
794 	__le16	i_links_count;	/* Links count */
795 	__le32	i_blocks_lo;	/* Blocks count */
796 	__le32	i_flags;	/* File flags */
797 	union {
798 		struct {
799 			__le32  l_i_version;
800 		} linux1;
801 		struct {
802 			__u32  h_i_translator;
803 		} hurd1;
804 		struct {
805 			__u32  m_i_reserved1;
806 		} masix1;
807 	} osd1;				/* OS dependent 1 */
808 	__le32	i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
809 	__le32	i_generation;	/* File version (for NFS) */
810 	__le32	i_file_acl_lo;	/* File ACL */
811 	__le32	i_size_high;
812 	__le32	i_obso_faddr;	/* Obsoleted fragment address */
813 	union {
814 		struct {
815 			__le16	l_i_blocks_high; /* were l_i_reserved1 */
816 			__le16	l_i_file_acl_high;
817 			__le16	l_i_uid_high;	/* these 2 fields */
818 			__le16	l_i_gid_high;	/* were reserved2[0] */
819 			__le16	l_i_checksum_lo;/* crc32c(uuid+inum+inode) LE */
820 			__le16	l_i_reserved;
821 		} linux2;
822 		struct {
823 			__le16	h_i_reserved1;	/* Obsoleted fragment number/size which are removed in ext4 */
824 			__u16	h_i_mode_high;
825 			__u16	h_i_uid_high;
826 			__u16	h_i_gid_high;
827 			__u32	h_i_author;
828 		} hurd2;
829 		struct {
830 			__le16	h_i_reserved1;	/* Obsoleted fragment number/size which are removed in ext4 */
831 			__le16	m_i_file_acl_high;
832 			__u32	m_i_reserved2[2];
833 		} masix2;
834 	} osd2;				/* OS dependent 2 */
835 	__le16	i_extra_isize;
836 	__le16	i_checksum_hi;	/* crc32c(uuid+inum+inode) BE */
837 	__le32  i_ctime_extra;  /* extra Change time      (nsec << 2 | epoch) */
838 	__le32  i_mtime_extra;  /* extra Modification time(nsec << 2 | epoch) */
839 	__le32  i_atime_extra;  /* extra Access time      (nsec << 2 | epoch) */
840 	__le32  i_crtime;       /* File Creation time */
841 	__le32  i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */
842 	__le32  i_version_hi;	/* high 32 bits for 64-bit version */
843 	__le32	i_projid;	/* Project ID */
844 };
845 
846 struct move_extent {
847 	__u32 reserved;		/* should be zero */
848 	__u32 donor_fd;		/* donor file descriptor */
849 	__u64 orig_start;	/* logical start offset in block for orig */
850 	__u64 donor_start;	/* logical start offset in block for donor */
851 	__u64 len;		/* block length to be moved */
852 	__u64 moved_len;	/* moved block length */
853 };
854 
855 #define EXT4_EPOCH_BITS 2
856 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
857 #define EXT4_NSEC_MASK  (~0UL << EXT4_EPOCH_BITS)
858 
859 /*
860  * Extended fields will fit into an inode if the filesystem was formatted
861  * with large inodes (-I 256 or larger) and there are not currently any EAs
862  * consuming all of the available space. For new inodes we always reserve
863  * enough space for the kernel's known extended fields, but for inodes
864  * created with an old kernel this might not have been the case. None of
865  * the extended inode fields is critical for correct filesystem operation.
866  * This macro checks if a certain field fits in the inode. Note that
867  * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
868  */
869 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field)	\
870 	((offsetof(typeof(*ext4_inode), field) +	\
871 	  sizeof((ext4_inode)->field))			\
872 	<= (EXT4_GOOD_OLD_INODE_SIZE +			\
873 	    (einode)->i_extra_isize))			\
874 
875 /*
876  * We use an encoding that preserves the times for extra epoch "00":
877  *
878  * extra  msb of                         adjust for signed
879  * epoch  32-bit                         32-bit tv_sec to
880  * bits   time    decoded 64-bit tv_sec  64-bit tv_sec      valid time range
881  * 0 0    1    -0x80000000..-0x00000001  0x000000000 1901-12-13..1969-12-31
882  * 0 0    0    0x000000000..0x07fffffff  0x000000000 1970-01-01..2038-01-19
883  * 0 1    1    0x080000000..0x0ffffffff  0x100000000 2038-01-19..2106-02-07
884  * 0 1    0    0x100000000..0x17fffffff  0x100000000 2106-02-07..2174-02-25
885  * 1 0    1    0x180000000..0x1ffffffff  0x200000000 2174-02-25..2242-03-16
886  * 1 0    0    0x200000000..0x27fffffff  0x200000000 2242-03-16..2310-04-04
887  * 1 1    1    0x280000000..0x2ffffffff  0x300000000 2310-04-04..2378-04-22
888  * 1 1    0    0x300000000..0x37fffffff  0x300000000 2378-04-22..2446-05-10
889  *
890  * Note that previous versions of the kernel on 64-bit systems would
891  * incorrectly use extra epoch bits 1,1 for dates between 1901 and
892  * 1970.  e2fsck will correct this, assuming that it is run on the
893  * affected filesystem before 2242.
894  */
895 
ext4_encode_extra_time(struct timespec64 * time)896 static inline __le32 ext4_encode_extra_time(struct timespec64 *time)
897 {
898 	u32 extra =((time->tv_sec - (s32)time->tv_sec) >> 32) & EXT4_EPOCH_MASK;
899 	return cpu_to_le32(extra | (time->tv_nsec << EXT4_EPOCH_BITS));
900 }
901 
ext4_decode_extra_time(struct timespec64 * time,__le32 extra)902 static inline void ext4_decode_extra_time(struct timespec64 *time,
903 					  __le32 extra)
904 {
905 	if (unlikely(extra & cpu_to_le32(EXT4_EPOCH_MASK)))
906 		time->tv_sec += (u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) << 32;
907 	time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS;
908 }
909 
910 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode)				\
911 do {										\
912 	if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra))     {\
913 		(raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec);	\
914 		(raw_inode)->xtime ## _extra =					\
915 				ext4_encode_extra_time(&(inode)->xtime);	\
916 		}								\
917 	else	\
918 		(raw_inode)->xtime = cpu_to_le32(clamp_t(int32_t, (inode)->xtime.tv_sec, S32_MIN, S32_MAX));	\
919 } while (0)
920 
921 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode)			       \
922 do {									       \
923 	if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime))		       \
924 		(raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec);      \
925 	if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra))	       \
926 		(raw_inode)->xtime ## _extra =				       \
927 				ext4_encode_extra_time(&(einode)->xtime);      \
928 } while (0)
929 
930 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode)				\
931 do {										\
932 	(inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime);	\
933 	if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) {	\
934 		ext4_decode_extra_time(&(inode)->xtime,				\
935 				       raw_inode->xtime ## _extra);		\
936 		}								\
937 	else									\
938 		(inode)->xtime.tv_nsec = 0;					\
939 } while (0)
940 
941 
942 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode)			       \
943 do {									       \
944 	if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime))		       \
945 		(einode)->xtime.tv_sec = 				       \
946 			(signed)le32_to_cpu((raw_inode)->xtime);	       \
947 	else								       \
948 		(einode)->xtime.tv_sec = 0;				       \
949 	if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra))	       \
950 		ext4_decode_extra_time(&(einode)->xtime,		       \
951 				       raw_inode->xtime ## _extra);	       \
952 	else								       \
953 		(einode)->xtime.tv_nsec = 0;				       \
954 } while (0)
955 
956 #define i_disk_version osd1.linux1.l_i_version
957 
958 #if defined(__KERNEL__) || defined(__linux__)
959 #define i_reserved1	osd1.linux1.l_i_reserved1
960 #define i_file_acl_high	osd2.linux2.l_i_file_acl_high
961 #define i_blocks_high	osd2.linux2.l_i_blocks_high
962 #define i_uid_low	i_uid
963 #define i_gid_low	i_gid
964 #define i_uid_high	osd2.linux2.l_i_uid_high
965 #define i_gid_high	osd2.linux2.l_i_gid_high
966 #define i_checksum_lo	osd2.linux2.l_i_checksum_lo
967 
968 #elif defined(__GNU__)
969 
970 #define i_translator	osd1.hurd1.h_i_translator
971 #define i_uid_high	osd2.hurd2.h_i_uid_high
972 #define i_gid_high	osd2.hurd2.h_i_gid_high
973 #define i_author	osd2.hurd2.h_i_author
974 
975 #elif defined(__masix__)
976 
977 #define i_reserved1	osd1.masix1.m_i_reserved1
978 #define i_file_acl_high	osd2.masix2.m_i_file_acl_high
979 #define i_reserved2	osd2.masix2.m_i_reserved2
980 
981 #endif /* defined(__KERNEL__) || defined(__linux__) */
982 
983 #include "extents_status.h"
984 #include "fast_commit.h"
985 
986 /*
987  * Lock subclasses for i_data_sem in the ext4_inode_info structure.
988  *
989  * These are needed to avoid lockdep false positives when we need to
990  * allocate blocks to the quota inode during ext4_map_blocks(), while
991  * holding i_data_sem for a normal (non-quota) inode.  Since we don't
992  * do quota tracking for the quota inode, this avoids deadlock (as
993  * well as infinite recursion, since it isn't turtles all the way
994  * down...)
995  *
996  *  I_DATA_SEM_NORMAL - Used for most inodes
997  *  I_DATA_SEM_OTHER  - Used by move_inode.c for the second normal inode
998  *			  where the second inode has larger inode number
999  *			  than the first
1000  *  I_DATA_SEM_QUOTA  - Used for quota inodes only
1001  */
1002 enum {
1003 	I_DATA_SEM_NORMAL = 0,
1004 	I_DATA_SEM_OTHER,
1005 	I_DATA_SEM_QUOTA,
1006 };
1007 
1008 
1009 /*
1010  * fourth extended file system inode data in memory
1011  */
1012 struct ext4_inode_info {
1013 	__le32	i_data[15];	/* unconverted */
1014 	__u32	i_dtime;
1015 	ext4_fsblk_t	i_file_acl;
1016 
1017 	/*
1018 	 * i_block_group is the number of the block group which contains
1019 	 * this file's inode.  Constant across the lifetime of the inode,
1020 	 * it is used for making block allocation decisions - we try to
1021 	 * place a file's data blocks near its inode block, and new inodes
1022 	 * near to their parent directory's inode.
1023 	 */
1024 	ext4_group_t	i_block_group;
1025 	ext4_lblk_t	i_dir_start_lookup;
1026 #if (BITS_PER_LONG < 64)
1027 	unsigned long	i_state_flags;		/* Dynamic state flags */
1028 #endif
1029 	unsigned long	i_flags;
1030 
1031 	/*
1032 	 * Extended attributes can be read independently of the main file
1033 	 * data. Taking i_rwsem even when reading would cause contention
1034 	 * between readers of EAs and writers of regular file data, so
1035 	 * instead we synchronize on xattr_sem when reading or changing
1036 	 * EAs.
1037 	 */
1038 	struct rw_semaphore xattr_sem;
1039 
1040 	/*
1041 	 * Inodes with EXT4_STATE_ORPHAN_FILE use i_orphan_idx. Otherwise
1042 	 * i_orphan is used.
1043 	 */
1044 	union {
1045 		struct list_head i_orphan;	/* unlinked but open inodes */
1046 		unsigned int i_orphan_idx;	/* Index in orphan file */
1047 	};
1048 
1049 	/* Fast commit related info */
1050 
1051 	/* For tracking dentry create updates */
1052 	struct list_head i_fc_dilist;
1053 	struct list_head i_fc_list;	/*
1054 					 * inodes that need fast commit
1055 					 * protected by sbi->s_fc_lock.
1056 					 */
1057 
1058 	/* Start of lblk range that needs to be committed in this fast commit */
1059 	ext4_lblk_t i_fc_lblk_start;
1060 
1061 	/* End of lblk range that needs to be committed in this fast commit */
1062 	ext4_lblk_t i_fc_lblk_len;
1063 
1064 	/* Number of ongoing updates on this inode */
1065 	atomic_t  i_fc_updates;
1066 
1067 	/* Fast commit wait queue for this inode */
1068 	wait_queue_head_t i_fc_wait;
1069 
1070 	/* Protect concurrent accesses on i_fc_lblk_start, i_fc_lblk_len */
1071 	struct mutex i_fc_lock;
1072 
1073 	/*
1074 	 * i_disksize keeps track of what the inode size is ON DISK, not
1075 	 * in memory.  During truncate, i_size is set to the new size by
1076 	 * the VFS prior to calling ext4_truncate(), but the filesystem won't
1077 	 * set i_disksize to 0 until the truncate is actually under way.
1078 	 *
1079 	 * The intent is that i_disksize always represents the blocks which
1080 	 * are used by this file.  This allows recovery to restart truncate
1081 	 * on orphans if we crash during truncate.  We actually write i_disksize
1082 	 * into the on-disk inode when writing inodes out, instead of i_size.
1083 	 *
1084 	 * The only time when i_disksize and i_size may be different is when
1085 	 * a truncate is in progress.  The only things which change i_disksize
1086 	 * are ext4_get_block (growth) and ext4_truncate (shrinkth).
1087 	 */
1088 	loff_t	i_disksize;
1089 
1090 	/*
1091 	 * i_data_sem is for serialising ext4_truncate() against
1092 	 * ext4_getblock().  In the 2.4 ext2 design, great chunks of inode's
1093 	 * data tree are chopped off during truncate. We can't do that in
1094 	 * ext4 because whenever we perform intermediate commits during
1095 	 * truncate, the inode and all the metadata blocks *must* be in a
1096 	 * consistent state which allows truncation of the orphans to restart
1097 	 * during recovery.  Hence we must fix the get_block-vs-truncate race
1098 	 * by other means, so we have i_data_sem.
1099 	 */
1100 	struct rw_semaphore i_data_sem;
1101 	struct inode vfs_inode;
1102 	struct jbd2_inode *jinode;
1103 
1104 	spinlock_t i_raw_lock;	/* protects updates to the raw inode */
1105 
1106 	/*
1107 	 * File creation time. Its function is same as that of
1108 	 * struct timespec64 i_{a,c,m}time in the generic inode.
1109 	 */
1110 	struct timespec64 i_crtime;
1111 
1112 	/* mballoc */
1113 	atomic_t i_prealloc_active;
1114 	struct list_head i_prealloc_list;
1115 	spinlock_t i_prealloc_lock;
1116 
1117 	/* extents status tree */
1118 	struct ext4_es_tree i_es_tree;
1119 	rwlock_t i_es_lock;
1120 	struct list_head i_es_list;
1121 	unsigned int i_es_all_nr;	/* protected by i_es_lock */
1122 	unsigned int i_es_shk_nr;	/* protected by i_es_lock */
1123 	ext4_lblk_t i_es_shrink_lblk;	/* Offset where we start searching for
1124 					   extents to shrink. Protected by
1125 					   i_es_lock  */
1126 
1127 	/* ialloc */
1128 	ext4_group_t	i_last_alloc_group;
1129 
1130 	/* allocation reservation info for delalloc */
1131 	/* In case of bigalloc, this refer to clusters rather than blocks */
1132 	unsigned int i_reserved_data_blocks;
1133 
1134 	/* pending cluster reservations for bigalloc file systems */
1135 	struct ext4_pending_tree i_pending_tree;
1136 
1137 	/* on-disk additional length */
1138 	__u16 i_extra_isize;
1139 
1140 	/* Indicate the inline data space. */
1141 	u16 i_inline_off;
1142 	u16 i_inline_size;
1143 
1144 #ifdef CONFIG_QUOTA
1145 	/* quota space reservation, managed internally by quota code */
1146 	qsize_t i_reserved_quota;
1147 #endif
1148 
1149 	/* Lock protecting lists below */
1150 	spinlock_t i_completed_io_lock;
1151 	/*
1152 	 * Completed IOs that need unwritten extents handling and have
1153 	 * transaction reserved
1154 	 */
1155 	struct list_head i_rsv_conversion_list;
1156 	struct work_struct i_rsv_conversion_work;
1157 	atomic_t i_unwritten; /* Nr. of inflight conversions pending */
1158 
1159 	spinlock_t i_block_reservation_lock;
1160 
1161 	/*
1162 	 * Transactions that contain inode's metadata needed to complete
1163 	 * fsync and fdatasync, respectively.
1164 	 */
1165 	tid_t i_sync_tid;
1166 	tid_t i_datasync_tid;
1167 
1168 #ifdef CONFIG_QUOTA
1169 	struct dquot *i_dquot[MAXQUOTAS];
1170 #endif
1171 
1172 	/* Precomputed uuid+inum+igen checksum for seeding inode checksums */
1173 	__u32 i_csum_seed;
1174 
1175 	kprojid_t i_projid;
1176 };
1177 
1178 /*
1179  * File system states
1180  */
1181 #define	EXT4_VALID_FS			0x0001	/* Unmounted cleanly */
1182 #define	EXT4_ERROR_FS			0x0002	/* Errors detected */
1183 #define	EXT4_ORPHAN_FS			0x0004	/* Orphans being recovered */
1184 #define EXT4_FC_REPLAY			0x0020	/* Fast commit replay ongoing */
1185 
1186 /*
1187  * Misc. filesystem flags
1188  */
1189 #define EXT2_FLAGS_SIGNED_HASH		0x0001  /* Signed dirhash in use */
1190 #define EXT2_FLAGS_UNSIGNED_HASH	0x0002  /* Unsigned dirhash in use */
1191 #define EXT2_FLAGS_TEST_FILESYS		0x0004	/* to test development code */
1192 
1193 /*
1194  * Mount flags set via mount options or defaults
1195  */
1196 #define EXT4_MOUNT_NO_MBCACHE		0x00001 /* Do not use mbcache */
1197 #define EXT4_MOUNT_GRPID		0x00004	/* Create files with directory's group */
1198 #define EXT4_MOUNT_DEBUG		0x00008	/* Some debugging messages */
1199 #define EXT4_MOUNT_ERRORS_CONT		0x00010	/* Continue on errors */
1200 #define EXT4_MOUNT_ERRORS_RO		0x00020	/* Remount fs ro on errors */
1201 #define EXT4_MOUNT_ERRORS_PANIC		0x00040	/* Panic on errors */
1202 #define EXT4_MOUNT_ERRORS_MASK		0x00070
1203 #define EXT4_MOUNT_MINIX_DF		0x00080	/* Mimics the Minix statfs */
1204 #define EXT4_MOUNT_NOLOAD		0x00100	/* Don't use existing journal*/
1205 #ifdef CONFIG_FS_DAX
1206 #define EXT4_MOUNT_DAX_ALWAYS		0x00200	/* Direct Access */
1207 #else
1208 #define EXT4_MOUNT_DAX_ALWAYS		0
1209 #endif
1210 #define EXT4_MOUNT_DATA_FLAGS		0x00C00	/* Mode for data writes: */
1211 #define EXT4_MOUNT_JOURNAL_DATA		0x00400	/* Write data to journal */
1212 #define EXT4_MOUNT_ORDERED_DATA		0x00800	/* Flush data before commit */
1213 #define EXT4_MOUNT_WRITEBACK_DATA	0x00C00	/* No data ordering */
1214 #define EXT4_MOUNT_UPDATE_JOURNAL	0x01000	/* Update the journal format */
1215 #define EXT4_MOUNT_NO_UID32		0x02000  /* Disable 32-bit UIDs */
1216 #define EXT4_MOUNT_XATTR_USER		0x04000	/* Extended user attributes */
1217 #define EXT4_MOUNT_POSIX_ACL		0x08000	/* POSIX Access Control Lists */
1218 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC	0x10000	/* No auto delalloc mapping */
1219 #define EXT4_MOUNT_BARRIER		0x20000 /* Use block barriers */
1220 #define EXT4_MOUNT_QUOTA		0x40000 /* Some quota option set */
1221 #define EXT4_MOUNT_USRQUOTA		0x80000 /* "old" user quota,
1222 						 * enable enforcement for hidden
1223 						 * quota files */
1224 #define EXT4_MOUNT_GRPQUOTA		0x100000 /* "old" group quota, enable
1225 						  * enforcement for hidden quota
1226 						  * files */
1227 #define EXT4_MOUNT_PRJQUOTA		0x200000 /* Enable project quota
1228 						  * enforcement */
1229 #define EXT4_MOUNT_DIOREAD_NOLOCK	0x400000 /* Enable support for dio read nolocking */
1230 #define EXT4_MOUNT_JOURNAL_CHECKSUM	0x800000 /* Journal checksums */
1231 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT	0x1000000 /* Journal Async Commit */
1232 #define EXT4_MOUNT_WARN_ON_ERROR	0x2000000 /* Trigger WARN_ON on error */
1233 #define EXT4_MOUNT_NO_PREFETCH_BLOCK_BITMAPS 0x4000000
1234 #define EXT4_MOUNT_DELALLOC		0x8000000 /* Delalloc support */
1235 #define EXT4_MOUNT_DATA_ERR_ABORT	0x10000000 /* Abort on file data write */
1236 #define EXT4_MOUNT_BLOCK_VALIDITY	0x20000000 /* Block validity checking */
1237 #define EXT4_MOUNT_DISCARD		0x40000000 /* Issue DISCARD requests */
1238 #define EXT4_MOUNT_INIT_INODE_TABLE	0x80000000 /* Initialize uninitialized itables */
1239 
1240 /*
1241  * Mount flags set either automatically (could not be set by mount option)
1242  * based on per file system feature or property or in special cases such as
1243  * distinguishing between explicit mount option definition and default.
1244  */
1245 #define EXT4_MOUNT2_EXPLICIT_DELALLOC	0x00000001 /* User explicitly
1246 						      specified delalloc */
1247 #define EXT4_MOUNT2_STD_GROUP_SIZE	0x00000002 /* We have standard group
1248 						      size of blocksize * 8
1249 						      blocks */
1250 #define EXT4_MOUNT2_HURD_COMPAT		0x00000004 /* Support HURD-castrated
1251 						      file systems */
1252 #define EXT4_MOUNT2_EXPLICIT_JOURNAL_CHECKSUM	0x00000008 /* User explicitly
1253 						specified journal checksum */
1254 
1255 #define EXT4_MOUNT2_JOURNAL_FAST_COMMIT	0x00000010 /* Journal fast commit */
1256 #define EXT4_MOUNT2_DAX_NEVER		0x00000020 /* Do not allow Direct Access */
1257 #define EXT4_MOUNT2_DAX_INODE		0x00000040 /* For printing options only */
1258 #define EXT4_MOUNT2_MB_OPTIMIZE_SCAN	0x00000080 /* Optimize group
1259 						    * scanning in mballoc
1260 						    */
1261 
1262 #define clear_opt(sb, opt)		EXT4_SB(sb)->s_mount_opt &= \
1263 						~EXT4_MOUNT_##opt
1264 #define set_opt(sb, opt)		EXT4_SB(sb)->s_mount_opt |= \
1265 						EXT4_MOUNT_##opt
1266 #define test_opt(sb, opt)		(EXT4_SB(sb)->s_mount_opt & \
1267 					 EXT4_MOUNT_##opt)
1268 
1269 #define clear_opt2(sb, opt)		EXT4_SB(sb)->s_mount_opt2 &= \
1270 						~EXT4_MOUNT2_##opt
1271 #define set_opt2(sb, opt)		EXT4_SB(sb)->s_mount_opt2 |= \
1272 						EXT4_MOUNT2_##opt
1273 #define test_opt2(sb, opt)		(EXT4_SB(sb)->s_mount_opt2 & \
1274 					 EXT4_MOUNT2_##opt)
1275 
1276 #define ext4_test_and_set_bit		__test_and_set_bit_le
1277 #define ext4_set_bit			__set_bit_le
1278 #define ext4_set_bit_atomic		ext2_set_bit_atomic
1279 #define ext4_test_and_clear_bit		__test_and_clear_bit_le
1280 #define ext4_clear_bit			__clear_bit_le
1281 #define ext4_clear_bit_atomic		ext2_clear_bit_atomic
1282 #define ext4_test_bit			test_bit_le
1283 #define ext4_find_next_zero_bit		find_next_zero_bit_le
1284 #define ext4_find_next_bit		find_next_bit_le
1285 
1286 extern void mb_set_bits(void *bm, int cur, int len);
1287 
1288 /*
1289  * Maximal mount counts between two filesystem checks
1290  */
1291 #define EXT4_DFL_MAX_MNT_COUNT		20	/* Allow 20 mounts */
1292 #define EXT4_DFL_CHECKINTERVAL		0	/* Don't use interval check */
1293 
1294 /*
1295  * Behaviour when detecting errors
1296  */
1297 #define EXT4_ERRORS_CONTINUE		1	/* Continue execution */
1298 #define EXT4_ERRORS_RO			2	/* Remount fs read-only */
1299 #define EXT4_ERRORS_PANIC		3	/* Panic */
1300 #define EXT4_ERRORS_DEFAULT		EXT4_ERRORS_CONTINUE
1301 
1302 /* Metadata checksum algorithm codes */
1303 #define EXT4_CRC32C_CHKSUM		1
1304 
1305 #define EXT4_LABEL_MAX			16
1306 
1307 /*
1308  * Structure of the super block
1309  */
1310 struct ext4_super_block {
1311 /*00*/	__le32	s_inodes_count;		/* Inodes count */
1312 	__le32	s_blocks_count_lo;	/* Blocks count */
1313 	__le32	s_r_blocks_count_lo;	/* Reserved blocks count */
1314 	__le32	s_free_blocks_count_lo;	/* Free blocks count */
1315 /*10*/	__le32	s_free_inodes_count;	/* Free inodes count */
1316 	__le32	s_first_data_block;	/* First Data Block */
1317 	__le32	s_log_block_size;	/* Block size */
1318 	__le32	s_log_cluster_size;	/* Allocation cluster size */
1319 /*20*/	__le32	s_blocks_per_group;	/* # Blocks per group */
1320 	__le32	s_clusters_per_group;	/* # Clusters per group */
1321 	__le32	s_inodes_per_group;	/* # Inodes per group */
1322 	__le32	s_mtime;		/* Mount time */
1323 /*30*/	__le32	s_wtime;		/* Write time */
1324 	__le16	s_mnt_count;		/* Mount count */
1325 	__le16	s_max_mnt_count;	/* Maximal mount count */
1326 	__le16	s_magic;		/* Magic signature */
1327 	__le16	s_state;		/* File system state */
1328 	__le16	s_errors;		/* Behaviour when detecting errors */
1329 	__le16	s_minor_rev_level;	/* minor revision level */
1330 /*40*/	__le32	s_lastcheck;		/* time of last check */
1331 	__le32	s_checkinterval;	/* max. time between checks */
1332 	__le32	s_creator_os;		/* OS */
1333 	__le32	s_rev_level;		/* Revision level */
1334 /*50*/	__le16	s_def_resuid;		/* Default uid for reserved blocks */
1335 	__le16	s_def_resgid;		/* Default gid for reserved blocks */
1336 	/*
1337 	 * These fields are for EXT4_DYNAMIC_REV superblocks only.
1338 	 *
1339 	 * Note: the difference between the compatible feature set and
1340 	 * the incompatible feature set is that if there is a bit set
1341 	 * in the incompatible feature set that the kernel doesn't
1342 	 * know about, it should refuse to mount the filesystem.
1343 	 *
1344 	 * e2fsck's requirements are more strict; if it doesn't know
1345 	 * about a feature in either the compatible or incompatible
1346 	 * feature set, it must abort and not try to meddle with
1347 	 * things it doesn't understand...
1348 	 */
1349 	__le32	s_first_ino;		/* First non-reserved inode */
1350 	__le16  s_inode_size;		/* size of inode structure */
1351 	__le16	s_block_group_nr;	/* block group # of this superblock */
1352 	__le32	s_feature_compat;	/* compatible feature set */
1353 /*60*/	__le32	s_feature_incompat;	/* incompatible feature set */
1354 	__le32	s_feature_ro_compat;	/* readonly-compatible feature set */
1355 /*68*/	__u8	s_uuid[16];		/* 128-bit uuid for volume */
1356 /*78*/	char	s_volume_name[EXT4_LABEL_MAX];	/* volume name */
1357 /*88*/	char	s_last_mounted[64] __nonstring;	/* directory where last mounted */
1358 /*C8*/	__le32	s_algorithm_usage_bitmap; /* For compression */
1359 	/*
1360 	 * Performance hints.  Directory preallocation should only
1361 	 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
1362 	 */
1363 	__u8	s_prealloc_blocks;	/* Nr of blocks to try to preallocate*/
1364 	__u8	s_prealloc_dir_blocks;	/* Nr to preallocate for dirs */
1365 	__le16	s_reserved_gdt_blocks;	/* Per group desc for online growth */
1366 	/*
1367 	 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
1368 	 */
1369 /*D0*/	__u8	s_journal_uuid[16];	/* uuid of journal superblock */
1370 /*E0*/	__le32	s_journal_inum;		/* inode number of journal file */
1371 	__le32	s_journal_dev;		/* device number of journal file */
1372 	__le32	s_last_orphan;		/* start of list of inodes to delete */
1373 	__le32	s_hash_seed[4];		/* HTREE hash seed */
1374 	__u8	s_def_hash_version;	/* Default hash version to use */
1375 	__u8	s_jnl_backup_type;
1376 	__le16  s_desc_size;		/* size of group descriptor */
1377 /*100*/	__le32	s_default_mount_opts;
1378 	__le32	s_first_meta_bg;	/* First metablock block group */
1379 	__le32	s_mkfs_time;		/* When the filesystem was created */
1380 	__le32	s_jnl_blocks[17];	/* Backup of the journal inode */
1381 	/* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
1382 /*150*/	__le32	s_blocks_count_hi;	/* Blocks count */
1383 	__le32	s_r_blocks_count_hi;	/* Reserved blocks count */
1384 	__le32	s_free_blocks_count_hi;	/* Free blocks count */
1385 	__le16	s_min_extra_isize;	/* All inodes have at least # bytes */
1386 	__le16	s_want_extra_isize; 	/* New inodes should reserve # bytes */
1387 	__le32	s_flags;		/* Miscellaneous flags */
1388 	__le16  s_raid_stride;		/* RAID stride */
1389 	__le16  s_mmp_update_interval;  /* # seconds to wait in MMP checking */
1390 	__le64  s_mmp_block;            /* Block for multi-mount protection */
1391 	__le32  s_raid_stripe_width;    /* blocks on all data disks (N*stride)*/
1392 	__u8	s_log_groups_per_flex;  /* FLEX_BG group size */
1393 	__u8	s_checksum_type;	/* metadata checksum algorithm used */
1394 	__u8	s_encryption_level;	/* versioning level for encryption */
1395 	__u8	s_reserved_pad;		/* Padding to next 32bits */
1396 	__le64	s_kbytes_written;	/* nr of lifetime kilobytes written */
1397 	__le32	s_snapshot_inum;	/* Inode number of active snapshot */
1398 	__le32	s_snapshot_id;		/* sequential ID of active snapshot */
1399 	__le64	s_snapshot_r_blocks_count; /* reserved blocks for active
1400 					      snapshot's future use */
1401 	__le32	s_snapshot_list;	/* inode number of the head of the
1402 					   on-disk snapshot list */
1403 #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count)
1404 	__le32	s_error_count;		/* number of fs errors */
1405 	__le32	s_first_error_time;	/* first time an error happened */
1406 	__le32	s_first_error_ino;	/* inode involved in first error */
1407 	__le64	s_first_error_block;	/* block involved of first error */
1408 	__u8	s_first_error_func[32] __nonstring;	/* function where the error happened */
1409 	__le32	s_first_error_line;	/* line number where error happened */
1410 	__le32	s_last_error_time;	/* most recent time of an error */
1411 	__le32	s_last_error_ino;	/* inode involved in last error */
1412 	__le32	s_last_error_line;	/* line number where error happened */
1413 	__le64	s_last_error_block;	/* block involved of last error */
1414 	__u8	s_last_error_func[32] __nonstring;	/* function where the error happened */
1415 #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts)
1416 	__u8	s_mount_opts[64];
1417 	__le32	s_usr_quota_inum;	/* inode for tracking user quota */
1418 	__le32	s_grp_quota_inum;	/* inode for tracking group quota */
1419 	__le32	s_overhead_clusters;	/* overhead blocks/clusters in fs */
1420 	__le32	s_backup_bgs[2];	/* groups with sparse_super2 SBs */
1421 	__u8	s_encrypt_algos[4];	/* Encryption algorithms in use  */
1422 	__u8	s_encrypt_pw_salt[16];	/* Salt used for string2key algorithm */
1423 	__le32	s_lpf_ino;		/* Location of the lost+found inode */
1424 	__le32	s_prj_quota_inum;	/* inode for tracking project quota */
1425 	__le32	s_checksum_seed;	/* crc32c(uuid) if csum_seed set */
1426 	__u8	s_wtime_hi;
1427 	__u8	s_mtime_hi;
1428 	__u8	s_mkfs_time_hi;
1429 	__u8	s_lastcheck_hi;
1430 	__u8	s_first_error_time_hi;
1431 	__u8	s_last_error_time_hi;
1432 	__u8	s_first_error_errcode;
1433 	__u8    s_last_error_errcode;
1434 	__le16  s_encoding;		/* Filename charset encoding */
1435 	__le16  s_encoding_flags;	/* Filename charset encoding flags */
1436 	__le32  s_orphan_file_inum;	/* Inode for tracking orphan inodes */
1437 	__le32	s_reserved[94];		/* Padding to the end of the block */
1438 	__le32	s_checksum;		/* crc32c(superblock) */
1439 };
1440 
1441 #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START)
1442 
1443 #ifdef __KERNEL__
1444 
1445 /* Number of quota types we support */
1446 #define EXT4_MAXQUOTAS 3
1447 
1448 #define EXT4_ENC_UTF8_12_1	1
1449 
1450 /* Types of ext4 journal triggers */
1451 enum ext4_journal_trigger_type {
1452 	EXT4_JTR_ORPHAN_FILE,
1453 	EXT4_JTR_NONE	/* This must be the last entry for indexing to work! */
1454 };
1455 
1456 #define EXT4_JOURNAL_TRIGGER_COUNT EXT4_JTR_NONE
1457 
1458 struct ext4_journal_trigger {
1459 	struct jbd2_buffer_trigger_type tr_triggers;
1460 	struct super_block *sb;
1461 };
1462 
EXT4_TRIGGER(struct jbd2_buffer_trigger_type * trigger)1463 static inline struct ext4_journal_trigger *EXT4_TRIGGER(
1464 				struct jbd2_buffer_trigger_type *trigger)
1465 {
1466 	return container_of(trigger, struct ext4_journal_trigger, tr_triggers);
1467 }
1468 
1469 #define EXT4_ORPHAN_BLOCK_MAGIC 0x0b10ca04
1470 
1471 /* Structure at the tail of orphan block */
1472 struct ext4_orphan_block_tail {
1473 	__le32 ob_magic;
1474 	__le32 ob_checksum;
1475 };
1476 
ext4_inodes_per_orphan_block(struct super_block * sb)1477 static inline int ext4_inodes_per_orphan_block(struct super_block *sb)
1478 {
1479 	return (sb->s_blocksize - sizeof(struct ext4_orphan_block_tail)) /
1480 			sizeof(u32);
1481 }
1482 
1483 struct ext4_orphan_block {
1484 	atomic_t ob_free_entries;	/* Number of free orphan entries in block */
1485 	struct buffer_head *ob_bh;	/* Buffer for orphan block */
1486 };
1487 
1488 /*
1489  * Info about orphan file.
1490  */
1491 struct ext4_orphan_info {
1492 	int of_blocks;			/* Number of orphan blocks in a file */
1493 	__u32 of_csum_seed;		/* Checksum seed for orphan file */
1494 	struct ext4_orphan_block *of_binfo;	/* Array with info about orphan
1495 						 * file blocks */
1496 };
1497 
1498 /*
1499  * fourth extended-fs super-block data in memory
1500  */
1501 struct ext4_sb_info {
1502 	unsigned long s_desc_size;	/* Size of a group descriptor in bytes */
1503 	unsigned long s_inodes_per_block;/* Number of inodes per block */
1504 	unsigned long s_blocks_per_group;/* Number of blocks in a group */
1505 	unsigned long s_clusters_per_group; /* Number of clusters in a group */
1506 	unsigned long s_inodes_per_group;/* Number of inodes in a group */
1507 	unsigned long s_itb_per_group;	/* Number of inode table blocks per group */
1508 	unsigned long s_gdb_count;	/* Number of group descriptor blocks */
1509 	unsigned long s_desc_per_block;	/* Number of group descriptors per block */
1510 	ext4_group_t s_groups_count;	/* Number of groups in the fs */
1511 	ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */
1512 	unsigned long s_overhead;  /* # of fs overhead clusters */
1513 	unsigned int s_cluster_ratio;	/* Number of blocks per cluster */
1514 	unsigned int s_cluster_bits;	/* log2 of s_cluster_ratio */
1515 	loff_t s_bitmap_maxbytes;	/* max bytes for bitmap files */
1516 	struct buffer_head * s_sbh;	/* Buffer containing the super block */
1517 	struct ext4_super_block *s_es;	/* Pointer to the super block in the buffer */
1518 	struct buffer_head * __rcu *s_group_desc;
1519 	unsigned int s_mount_opt;
1520 	unsigned int s_mount_opt2;
1521 	unsigned long s_mount_flags;
1522 	unsigned int s_def_mount_opt;
1523 	ext4_fsblk_t s_sb_block;
1524 	atomic64_t s_resv_clusters;
1525 	kuid_t s_resuid;
1526 	kgid_t s_resgid;
1527 	unsigned short s_mount_state;
1528 	unsigned short s_pad;
1529 	int s_addr_per_block_bits;
1530 	int s_desc_per_block_bits;
1531 	int s_inode_size;
1532 	int s_first_ino;
1533 	unsigned int s_inode_readahead_blks;
1534 	unsigned int s_inode_goal;
1535 	u32 s_hash_seed[4];
1536 	int s_def_hash_version;
1537 	int s_hash_unsigned;	/* 3 if hash should be unsigned, 0 if not */
1538 	struct percpu_counter s_freeclusters_counter;
1539 	struct percpu_counter s_freeinodes_counter;
1540 	struct percpu_counter s_dirs_counter;
1541 	struct percpu_counter s_dirtyclusters_counter;
1542 	struct percpu_counter s_sra_exceeded_retry_limit;
1543 	struct blockgroup_lock *s_blockgroup_lock;
1544 	struct proc_dir_entry *s_proc;
1545 	struct kobject s_kobj;
1546 	struct completion s_kobj_unregister;
1547 	struct super_block *s_sb;
1548 	struct buffer_head *s_mmp_bh;
1549 
1550 	/* Journaling */
1551 	struct journal_s *s_journal;
1552 	unsigned long s_ext4_flags;		/* Ext4 superblock flags */
1553 	struct mutex s_orphan_lock;	/* Protects on disk list changes */
1554 	struct list_head s_orphan;	/* List of orphaned inodes in on disk
1555 					   list */
1556 	struct ext4_orphan_info s_orphan_info;
1557 	unsigned long s_commit_interval;
1558 	u32 s_max_batch_time;
1559 	u32 s_min_batch_time;
1560 	struct block_device *s_journal_bdev;
1561 #ifdef CONFIG_QUOTA
1562 	/* Names of quota files with journalled quota */
1563 	char __rcu *s_qf_names[EXT4_MAXQUOTAS];
1564 	int s_jquota_fmt;			/* Format of quota to use */
1565 #endif
1566 	unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */
1567 	struct ext4_system_blocks __rcu *s_system_blks;
1568 
1569 #ifdef EXTENTS_STATS
1570 	/* ext4 extents stats */
1571 	unsigned long s_ext_min;
1572 	unsigned long s_ext_max;
1573 	unsigned long s_depth_max;
1574 	spinlock_t s_ext_stats_lock;
1575 	unsigned long s_ext_blocks;
1576 	unsigned long s_ext_extents;
1577 #endif
1578 
1579 	/* for buddy allocator */
1580 	struct ext4_group_info ** __rcu *s_group_info;
1581 	struct inode *s_buddy_cache;
1582 	spinlock_t s_md_lock;
1583 	unsigned short *s_mb_offsets;
1584 	unsigned int *s_mb_maxs;
1585 	unsigned int s_group_info_size;
1586 	unsigned int s_mb_free_pending;
1587 	struct list_head s_freed_data_list;	/* List of blocks to be freed
1588 						   after commit completed */
1589 	struct list_head s_discard_list;
1590 	struct work_struct s_discard_work;
1591 	atomic_t s_retry_alloc_pending;
1592 	struct rb_root s_mb_avg_fragment_size_root;
1593 	rwlock_t s_mb_rb_lock;
1594 	struct list_head *s_mb_largest_free_orders;
1595 	rwlock_t *s_mb_largest_free_orders_locks;
1596 
1597 	/* tunables */
1598 	unsigned long s_stripe;
1599 	unsigned int s_mb_max_linear_groups;
1600 	unsigned int s_mb_stream_request;
1601 	unsigned int s_mb_max_to_scan;
1602 	unsigned int s_mb_min_to_scan;
1603 	unsigned int s_mb_stats;
1604 	unsigned int s_mb_order2_reqs;
1605 	unsigned int s_mb_group_prealloc;
1606 	unsigned int s_mb_max_inode_prealloc;
1607 	unsigned int s_max_dir_size_kb;
1608 	/* where last allocation was done - for stream allocation */
1609 	unsigned long s_mb_last_group;
1610 	unsigned long s_mb_last_start;
1611 	unsigned int s_mb_prefetch;
1612 	unsigned int s_mb_prefetch_limit;
1613 
1614 	/* stats for buddy allocator */
1615 	atomic_t s_bal_reqs;	/* number of reqs with len > 1 */
1616 	atomic_t s_bal_success;	/* we found long enough chunks */
1617 	atomic_t s_bal_allocated;	/* in blocks */
1618 	atomic_t s_bal_ex_scanned;	/* total extents scanned */
1619 	atomic_t s_bal_groups_scanned;	/* number of groups scanned */
1620 	atomic_t s_bal_goals;	/* goal hits */
1621 	atomic_t s_bal_breaks;	/* too long searches */
1622 	atomic_t s_bal_2orders;	/* 2^order hits */
1623 	atomic_t s_bal_cr0_bad_suggestions;
1624 	atomic_t s_bal_cr1_bad_suggestions;
1625 	atomic64_t s_bal_cX_groups_considered[4];
1626 	atomic64_t s_bal_cX_hits[4];
1627 	atomic64_t s_bal_cX_failed[4];		/* cX loop didn't find blocks */
1628 	atomic_t s_mb_buddies_generated;	/* number of buddies generated */
1629 	atomic64_t s_mb_generation_time;
1630 	atomic_t s_mb_lost_chunks;
1631 	atomic_t s_mb_preallocated;
1632 	atomic_t s_mb_discarded;
1633 	atomic_t s_lock_busy;
1634 
1635 	/* locality groups */
1636 	struct ext4_locality_group __percpu *s_locality_groups;
1637 
1638 	/* for write statistics */
1639 	unsigned long s_sectors_written_start;
1640 	u64 s_kbytes_written;
1641 
1642 	/* the size of zero-out chunk */
1643 	unsigned int s_extent_max_zeroout_kb;
1644 
1645 	unsigned int s_log_groups_per_flex;
1646 	struct flex_groups * __rcu *s_flex_groups;
1647 	ext4_group_t s_flex_groups_allocated;
1648 
1649 	/* workqueue for reserved extent conversions (buffered io) */
1650 	struct workqueue_struct *rsv_conversion_wq;
1651 
1652 	/* timer for periodic error stats printing */
1653 	struct timer_list s_err_report;
1654 
1655 	/* Lazy inode table initialization info */
1656 	struct ext4_li_request *s_li_request;
1657 	/* Wait multiplier for lazy initialization thread */
1658 	unsigned int s_li_wait_mult;
1659 
1660 	/* Kernel thread for multiple mount protection */
1661 	struct task_struct *s_mmp_tsk;
1662 
1663 	/* record the last minlen when FITRIM is called. */
1664 	unsigned long s_last_trim_minblks;
1665 
1666 	/* Reference to checksum algorithm driver via cryptoapi */
1667 	struct crypto_shash *s_chksum_driver;
1668 
1669 	/* Precomputed FS UUID checksum for seeding other checksums */
1670 	__u32 s_csum_seed;
1671 
1672 	/* Reclaim extents from extent status tree */
1673 	struct shrinker s_es_shrinker;
1674 	struct list_head s_es_list;	/* List of inodes with reclaimable extents */
1675 	long s_es_nr_inode;
1676 	struct ext4_es_stats s_es_stats;
1677 	struct mb_cache *s_ea_block_cache;
1678 	struct mb_cache *s_ea_inode_cache;
1679 	spinlock_t s_es_lock ____cacheline_aligned_in_smp;
1680 
1681 	/* Journal triggers for checksum computation */
1682 	struct ext4_journal_trigger s_journal_triggers[EXT4_JOURNAL_TRIGGER_COUNT];
1683 
1684 	/* Ratelimit ext4 messages. */
1685 	struct ratelimit_state s_err_ratelimit_state;
1686 	struct ratelimit_state s_warning_ratelimit_state;
1687 	struct ratelimit_state s_msg_ratelimit_state;
1688 	atomic_t s_warning_count;
1689 	atomic_t s_msg_count;
1690 
1691 	/* Encryption policy for '-o test_dummy_encryption' */
1692 	struct fscrypt_dummy_policy s_dummy_enc_policy;
1693 
1694 	/*
1695 	 * Barrier between writepages ops and changing any inode's JOURNAL_DATA
1696 	 * or EXTENTS flag.
1697 	 */
1698 	struct percpu_rw_semaphore s_writepages_rwsem;
1699 	struct dax_device *s_daxdev;
1700 	u64 s_dax_part_off;
1701 #ifdef CONFIG_EXT4_DEBUG
1702 	unsigned long s_simulate_fail;
1703 #endif
1704 	/* Record the errseq of the backing block device */
1705 	errseq_t s_bdev_wb_err;
1706 	spinlock_t s_bdev_wb_lock;
1707 
1708 	/* Information about errors that happened during this mount */
1709 	spinlock_t s_error_lock;
1710 	int s_add_error_count;
1711 	int s_first_error_code;
1712 	__u32 s_first_error_line;
1713 	__u32 s_first_error_ino;
1714 	__u64 s_first_error_block;
1715 	const char *s_first_error_func;
1716 	time64_t s_first_error_time;
1717 	int s_last_error_code;
1718 	__u32 s_last_error_line;
1719 	__u32 s_last_error_ino;
1720 	__u64 s_last_error_block;
1721 	const char *s_last_error_func;
1722 	time64_t s_last_error_time;
1723 	/*
1724 	 * If we are in a context where we cannot update error information in
1725 	 * the on-disk superblock, we queue this work to do it.
1726 	 */
1727 	struct work_struct s_error_work;
1728 
1729 	/* Ext4 fast commit sub transaction ID */
1730 	atomic_t s_fc_subtid;
1731 
1732 	/*
1733 	 * After commit starts, the main queue gets locked, and the further
1734 	 * updates get added in the staging queue.
1735 	 */
1736 #define FC_Q_MAIN	0
1737 #define FC_Q_STAGING	1
1738 	struct list_head s_fc_q[2];	/* Inodes staged for fast commit
1739 					 * that have data changes in them.
1740 					 */
1741 	struct list_head s_fc_dentry_q[2];	/* directory entry updates */
1742 	unsigned int s_fc_bytes;
1743 	/*
1744 	 * Main fast commit lock. This lock protects accesses to the
1745 	 * following fields:
1746 	 * ei->i_fc_list, s_fc_dentry_q, s_fc_q, s_fc_bytes, s_fc_bh.
1747 	 */
1748 	spinlock_t s_fc_lock;
1749 	struct buffer_head *s_fc_bh;
1750 	struct ext4_fc_stats s_fc_stats;
1751 	tid_t s_fc_ineligible_tid;
1752 #ifdef CONFIG_EXT4_DEBUG
1753 	int s_fc_debug_max_replay;
1754 #endif
1755 	struct ext4_fc_replay_state s_fc_replay_state;
1756 };
1757 
EXT4_SB(struct super_block * sb)1758 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb)
1759 {
1760 	return sb->s_fs_info;
1761 }
EXT4_I(struct inode * inode)1762 static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
1763 {
1764 	return container_of(inode, struct ext4_inode_info, vfs_inode);
1765 }
1766 
ext4_valid_inum(struct super_block * sb,unsigned long ino)1767 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
1768 {
1769 	return ino == EXT4_ROOT_INO ||
1770 		(ino >= EXT4_FIRST_INO(sb) &&
1771 		 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
1772 }
1773 
1774 /*
1775  * Returns: sbi->field[index]
1776  * Used to access an array element from the following sbi fields which require
1777  * rcu protection to avoid dereferencing an invalid pointer due to reassignment
1778  * - s_group_desc
1779  * - s_group_info
1780  * - s_flex_group
1781  */
1782 #define sbi_array_rcu_deref(sbi, field, index)				   \
1783 ({									   \
1784 	typeof(*((sbi)->field)) _v;					   \
1785 	rcu_read_lock();						   \
1786 	_v = ((typeof(_v)*)rcu_dereference((sbi)->field))[index];	   \
1787 	rcu_read_unlock();						   \
1788 	_v;								   \
1789 })
1790 
1791 /*
1792  * run-time mount flags
1793  */
1794 enum {
1795 	EXT4_MF_MNTDIR_SAMPLED,
1796 	EXT4_MF_FS_ABORTED,	/* Fatal error detected */
1797 	EXT4_MF_FC_INELIGIBLE	/* Fast commit ineligible */
1798 };
1799 
ext4_set_mount_flag(struct super_block * sb,int bit)1800 static inline void ext4_set_mount_flag(struct super_block *sb, int bit)
1801 {
1802 	set_bit(bit, &EXT4_SB(sb)->s_mount_flags);
1803 }
1804 
ext4_clear_mount_flag(struct super_block * sb,int bit)1805 static inline void ext4_clear_mount_flag(struct super_block *sb, int bit)
1806 {
1807 	clear_bit(bit, &EXT4_SB(sb)->s_mount_flags);
1808 }
1809 
ext4_test_mount_flag(struct super_block * sb,int bit)1810 static inline int ext4_test_mount_flag(struct super_block *sb, int bit)
1811 {
1812 	return test_bit(bit, &EXT4_SB(sb)->s_mount_flags);
1813 }
1814 
1815 
1816 /*
1817  * Simulate_fail codes
1818  */
1819 #define EXT4_SIM_BBITMAP_EIO	1
1820 #define EXT4_SIM_BBITMAP_CRC	2
1821 #define EXT4_SIM_IBITMAP_EIO	3
1822 #define EXT4_SIM_IBITMAP_CRC	4
1823 #define EXT4_SIM_INODE_EIO	5
1824 #define EXT4_SIM_INODE_CRC	6
1825 #define EXT4_SIM_DIRBLOCK_EIO	7
1826 #define EXT4_SIM_DIRBLOCK_CRC	8
1827 
ext4_simulate_fail(struct super_block * sb,unsigned long code)1828 static inline bool ext4_simulate_fail(struct super_block *sb,
1829 				     unsigned long code)
1830 {
1831 #ifdef CONFIG_EXT4_DEBUG
1832 	struct ext4_sb_info *sbi = EXT4_SB(sb);
1833 
1834 	if (unlikely(sbi->s_simulate_fail == code)) {
1835 		sbi->s_simulate_fail = 0;
1836 		return true;
1837 	}
1838 #endif
1839 	return false;
1840 }
1841 
ext4_simulate_fail_bh(struct super_block * sb,struct buffer_head * bh,unsigned long code)1842 static inline void ext4_simulate_fail_bh(struct super_block *sb,
1843 					 struct buffer_head *bh,
1844 					 unsigned long code)
1845 {
1846 	if (!IS_ERR(bh) && ext4_simulate_fail(sb, code))
1847 		clear_buffer_uptodate(bh);
1848 }
1849 
1850 /*
1851  * Error number codes for s_{first,last}_error_errno
1852  *
1853  * Linux errno numbers are architecture specific, so we need to translate
1854  * them into something which is architecture independent.   We don't define
1855  * codes for all errno's; just the ones which are most likely to be the cause
1856  * of an ext4_error() call.
1857  */
1858 #define EXT4_ERR_UNKNOWN	 1
1859 #define EXT4_ERR_EIO		 2
1860 #define EXT4_ERR_ENOMEM		 3
1861 #define EXT4_ERR_EFSBADCRC	 4
1862 #define EXT4_ERR_EFSCORRUPTED	 5
1863 #define EXT4_ERR_ENOSPC		 6
1864 #define EXT4_ERR_ENOKEY		 7
1865 #define EXT4_ERR_EROFS		 8
1866 #define EXT4_ERR_EFBIG		 9
1867 #define EXT4_ERR_EEXIST		10
1868 #define EXT4_ERR_ERANGE		11
1869 #define EXT4_ERR_EOVERFLOW	12
1870 #define EXT4_ERR_EBUSY		13
1871 #define EXT4_ERR_ENOTDIR	14
1872 #define EXT4_ERR_ENOTEMPTY	15
1873 #define EXT4_ERR_ESHUTDOWN	16
1874 #define EXT4_ERR_EFAULT		17
1875 
1876 /*
1877  * Inode dynamic state flags
1878  */
1879 enum {
1880 	EXT4_STATE_JDATA,		/* journaled data exists */
1881 	EXT4_STATE_NEW,			/* inode is newly created */
1882 	EXT4_STATE_XATTR,		/* has in-inode xattrs */
1883 	EXT4_STATE_NO_EXPAND,		/* No space for expansion */
1884 	EXT4_STATE_DA_ALLOC_CLOSE,	/* Alloc DA blks on close */
1885 	EXT4_STATE_EXT_MIGRATE,		/* Inode is migrating */
1886 	EXT4_STATE_NEWENTRY,		/* File just added to dir */
1887 	EXT4_STATE_MAY_INLINE_DATA,	/* may have in-inode data */
1888 	EXT4_STATE_EXT_PRECACHED,	/* extents have been precached */
1889 	EXT4_STATE_LUSTRE_EA_INODE,	/* Lustre-style ea_inode */
1890 	EXT4_STATE_VERITY_IN_PROGRESS,	/* building fs-verity Merkle tree */
1891 	EXT4_STATE_FC_COMMITTING,	/* Fast commit ongoing */
1892 	EXT4_STATE_ORPHAN_FILE,		/* Inode orphaned in orphan file */
1893 };
1894 
1895 #define EXT4_INODE_BIT_FNS(name, field, offset)				\
1896 static inline int ext4_test_inode_##name(struct inode *inode, int bit)	\
1897 {									\
1898 	return test_bit(bit + (offset), &EXT4_I(inode)->i_##field);	\
1899 }									\
1900 static inline void ext4_set_inode_##name(struct inode *inode, int bit)	\
1901 {									\
1902 	set_bit(bit + (offset), &EXT4_I(inode)->i_##field);		\
1903 }									\
1904 static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \
1905 {									\
1906 	clear_bit(bit + (offset), &EXT4_I(inode)->i_##field);		\
1907 }
1908 
1909 /* Add these declarations here only so that these functions can be
1910  * found by name.  Otherwise, they are very hard to locate. */
1911 static inline int ext4_test_inode_flag(struct inode *inode, int bit);
1912 static inline void ext4_set_inode_flag(struct inode *inode, int bit);
1913 static inline void ext4_clear_inode_flag(struct inode *inode, int bit);
1914 EXT4_INODE_BIT_FNS(flag, flags, 0)
1915 
1916 /* Add these declarations here only so that these functions can be
1917  * found by name.  Otherwise, they are very hard to locate. */
1918 static inline int ext4_test_inode_state(struct inode *inode, int bit);
1919 static inline void ext4_set_inode_state(struct inode *inode, int bit);
1920 static inline void ext4_clear_inode_state(struct inode *inode, int bit);
1921 #if (BITS_PER_LONG < 64)
1922 EXT4_INODE_BIT_FNS(state, state_flags, 0)
1923 
ext4_clear_state_flags(struct ext4_inode_info * ei)1924 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1925 {
1926 	(ei)->i_state_flags = 0;
1927 }
1928 #else
1929 EXT4_INODE_BIT_FNS(state, flags, 32)
1930 
ext4_clear_state_flags(struct ext4_inode_info * ei)1931 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1932 {
1933 	/* We depend on the fact that callers will set i_flags */
1934 }
1935 #endif
1936 #else
1937 /* Assume that user mode programs are passing in an ext4fs superblock, not
1938  * a kernel struct super_block.  This will allow us to call the feature-test
1939  * macros from user land. */
1940 #define EXT4_SB(sb)	(sb)
1941 #endif
1942 
ext4_verity_in_progress(struct inode * inode)1943 static inline bool ext4_verity_in_progress(struct inode *inode)
1944 {
1945 	return IS_ENABLED(CONFIG_FS_VERITY) &&
1946 	       ext4_test_inode_state(inode, EXT4_STATE_VERITY_IN_PROGRESS);
1947 }
1948 
1949 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
1950 
1951 /*
1952  * Codes for operating systems
1953  */
1954 #define EXT4_OS_LINUX		0
1955 #define EXT4_OS_HURD		1
1956 #define EXT4_OS_MASIX		2
1957 #define EXT4_OS_FREEBSD		3
1958 #define EXT4_OS_LITES		4
1959 
1960 /*
1961  * Revision levels
1962  */
1963 #define EXT4_GOOD_OLD_REV	0	/* The good old (original) format */
1964 #define EXT4_DYNAMIC_REV	1	/* V2 format w/ dynamic inode sizes */
1965 
1966 #define EXT4_MAX_SUPP_REV	EXT4_DYNAMIC_REV
1967 
1968 #define EXT4_GOOD_OLD_INODE_SIZE 128
1969 
1970 #define EXT4_EXTRA_TIMESTAMP_MAX	(((s64)1 << 34) - 1  + S32_MIN)
1971 #define EXT4_NON_EXTRA_TIMESTAMP_MAX	S32_MAX
1972 #define EXT4_TIMESTAMP_MIN		S32_MIN
1973 
1974 /*
1975  * Feature set definitions
1976  */
1977 
1978 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC	0x0001
1979 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES	0x0002
1980 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL		0x0004
1981 #define EXT4_FEATURE_COMPAT_EXT_ATTR		0x0008
1982 #define EXT4_FEATURE_COMPAT_RESIZE_INODE	0x0010
1983 #define EXT4_FEATURE_COMPAT_DIR_INDEX		0x0020
1984 #define EXT4_FEATURE_COMPAT_SPARSE_SUPER2	0x0200
1985 /*
1986  * The reason why "FAST_COMMIT" is a compat feature is that, FS becomes
1987  * incompatible only if fast commit blocks are present in the FS. Since we
1988  * clear the journal (and thus the fast commit blocks), we don't mark FS as
1989  * incompatible. We also have a JBD2 incompat feature, which gets set when
1990  * there are fast commit blocks present in the journal.
1991  */
1992 #define EXT4_FEATURE_COMPAT_FAST_COMMIT		0x0400
1993 #define EXT4_FEATURE_COMPAT_STABLE_INODES	0x0800
1994 #define EXT4_FEATURE_COMPAT_ORPHAN_FILE		0x1000	/* Orphan file exists */
1995 
1996 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER	0x0001
1997 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE	0x0002
1998 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR	0x0004
1999 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE        0x0008
2000 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM		0x0010
2001 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK	0x0020
2002 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE	0x0040
2003 #define EXT4_FEATURE_RO_COMPAT_QUOTA		0x0100
2004 #define EXT4_FEATURE_RO_COMPAT_BIGALLOC		0x0200
2005 /*
2006  * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM).  When
2007  * METADATA_CSUM is set, group descriptor checksums use the same algorithm as
2008  * all other data structures' checksums.  However, the METADATA_CSUM and
2009  * GDT_CSUM bits are mutually exclusive.
2010  */
2011 #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM	0x0400
2012 #define EXT4_FEATURE_RO_COMPAT_READONLY		0x1000
2013 #define EXT4_FEATURE_RO_COMPAT_PROJECT		0x2000
2014 #define EXT4_FEATURE_RO_COMPAT_VERITY		0x8000
2015 #define EXT4_FEATURE_RO_COMPAT_ORPHAN_PRESENT	0x10000 /* Orphan file may be
2016 							   non-empty */
2017 
2018 #define EXT4_FEATURE_INCOMPAT_COMPRESSION	0x0001
2019 #define EXT4_FEATURE_INCOMPAT_FILETYPE		0x0002
2020 #define EXT4_FEATURE_INCOMPAT_RECOVER		0x0004 /* Needs recovery */
2021 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV	0x0008 /* Journal device */
2022 #define EXT4_FEATURE_INCOMPAT_META_BG		0x0010
2023 #define EXT4_FEATURE_INCOMPAT_EXTENTS		0x0040 /* extents support */
2024 #define EXT4_FEATURE_INCOMPAT_64BIT		0x0080
2025 #define EXT4_FEATURE_INCOMPAT_MMP               0x0100
2026 #define EXT4_FEATURE_INCOMPAT_FLEX_BG		0x0200
2027 #define EXT4_FEATURE_INCOMPAT_EA_INODE		0x0400 /* EA in inode */
2028 #define EXT4_FEATURE_INCOMPAT_DIRDATA		0x1000 /* data in dirent */
2029 #define EXT4_FEATURE_INCOMPAT_CSUM_SEED		0x2000
2030 #define EXT4_FEATURE_INCOMPAT_LARGEDIR		0x4000 /* >2GB or 3-lvl htree */
2031 #define EXT4_FEATURE_INCOMPAT_INLINE_DATA	0x8000 /* data in inode */
2032 #define EXT4_FEATURE_INCOMPAT_ENCRYPT		0x10000
2033 #define EXT4_FEATURE_INCOMPAT_CASEFOLD		0x20000
2034 
2035 extern void ext4_update_dynamic_rev(struct super_block *sb);
2036 
2037 #define EXT4_FEATURE_COMPAT_FUNCS(name, flagname) \
2038 static inline bool ext4_has_feature_##name(struct super_block *sb) \
2039 { \
2040 	return ((EXT4_SB(sb)->s_es->s_feature_compat & \
2041 		cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname)) != 0); \
2042 } \
2043 static inline void ext4_set_feature_##name(struct super_block *sb) \
2044 { \
2045 	ext4_update_dynamic_rev(sb); \
2046 	EXT4_SB(sb)->s_es->s_feature_compat |= \
2047 		cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \
2048 } \
2049 static inline void ext4_clear_feature_##name(struct super_block *sb) \
2050 { \
2051 	EXT4_SB(sb)->s_es->s_feature_compat &= \
2052 		~cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \
2053 }
2054 
2055 #define EXT4_FEATURE_RO_COMPAT_FUNCS(name, flagname) \
2056 static inline bool ext4_has_feature_##name(struct super_block *sb) \
2057 { \
2058 	return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \
2059 		cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname)) != 0); \
2060 } \
2061 static inline void ext4_set_feature_##name(struct super_block *sb) \
2062 { \
2063 	ext4_update_dynamic_rev(sb); \
2064 	EXT4_SB(sb)->s_es->s_feature_ro_compat |= \
2065 		cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \
2066 } \
2067 static inline void ext4_clear_feature_##name(struct super_block *sb) \
2068 { \
2069 	EXT4_SB(sb)->s_es->s_feature_ro_compat &= \
2070 		~cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \
2071 }
2072 
2073 #define EXT4_FEATURE_INCOMPAT_FUNCS(name, flagname) \
2074 static inline bool ext4_has_feature_##name(struct super_block *sb) \
2075 { \
2076 	return ((EXT4_SB(sb)->s_es->s_feature_incompat & \
2077 		cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname)) != 0); \
2078 } \
2079 static inline void ext4_set_feature_##name(struct super_block *sb) \
2080 { \
2081 	ext4_update_dynamic_rev(sb); \
2082 	EXT4_SB(sb)->s_es->s_feature_incompat |= \
2083 		cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \
2084 } \
2085 static inline void ext4_clear_feature_##name(struct super_block *sb) \
2086 { \
2087 	EXT4_SB(sb)->s_es->s_feature_incompat &= \
2088 		~cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \
2089 }
2090 
EXT4_FEATURE_COMPAT_FUNCS(dir_prealloc,DIR_PREALLOC)2091 EXT4_FEATURE_COMPAT_FUNCS(dir_prealloc,		DIR_PREALLOC)
2092 EXT4_FEATURE_COMPAT_FUNCS(imagic_inodes,	IMAGIC_INODES)
2093 EXT4_FEATURE_COMPAT_FUNCS(journal,		HAS_JOURNAL)
2094 EXT4_FEATURE_COMPAT_FUNCS(xattr,		EXT_ATTR)
2095 EXT4_FEATURE_COMPAT_FUNCS(resize_inode,		RESIZE_INODE)
2096 EXT4_FEATURE_COMPAT_FUNCS(dir_index,		DIR_INDEX)
2097 EXT4_FEATURE_COMPAT_FUNCS(sparse_super2,	SPARSE_SUPER2)
2098 EXT4_FEATURE_COMPAT_FUNCS(fast_commit,		FAST_COMMIT)
2099 EXT4_FEATURE_COMPAT_FUNCS(stable_inodes,	STABLE_INODES)
2100 EXT4_FEATURE_COMPAT_FUNCS(orphan_file,		ORPHAN_FILE)
2101 
2102 EXT4_FEATURE_RO_COMPAT_FUNCS(sparse_super,	SPARSE_SUPER)
2103 EXT4_FEATURE_RO_COMPAT_FUNCS(large_file,	LARGE_FILE)
2104 EXT4_FEATURE_RO_COMPAT_FUNCS(btree_dir,		BTREE_DIR)
2105 EXT4_FEATURE_RO_COMPAT_FUNCS(huge_file,		HUGE_FILE)
2106 EXT4_FEATURE_RO_COMPAT_FUNCS(gdt_csum,		GDT_CSUM)
2107 EXT4_FEATURE_RO_COMPAT_FUNCS(dir_nlink,		DIR_NLINK)
2108 EXT4_FEATURE_RO_COMPAT_FUNCS(extra_isize,	EXTRA_ISIZE)
2109 EXT4_FEATURE_RO_COMPAT_FUNCS(quota,		QUOTA)
2110 EXT4_FEATURE_RO_COMPAT_FUNCS(bigalloc,		BIGALLOC)
2111 EXT4_FEATURE_RO_COMPAT_FUNCS(metadata_csum,	METADATA_CSUM)
2112 EXT4_FEATURE_RO_COMPAT_FUNCS(readonly,		READONLY)
2113 EXT4_FEATURE_RO_COMPAT_FUNCS(project,		PROJECT)
2114 EXT4_FEATURE_RO_COMPAT_FUNCS(verity,		VERITY)
2115 EXT4_FEATURE_RO_COMPAT_FUNCS(orphan_present,	ORPHAN_PRESENT)
2116 
2117 EXT4_FEATURE_INCOMPAT_FUNCS(compression,	COMPRESSION)
2118 EXT4_FEATURE_INCOMPAT_FUNCS(filetype,		FILETYPE)
2119 EXT4_FEATURE_INCOMPAT_FUNCS(journal_needs_recovery,	RECOVER)
2120 EXT4_FEATURE_INCOMPAT_FUNCS(journal_dev,	JOURNAL_DEV)
2121 EXT4_FEATURE_INCOMPAT_FUNCS(meta_bg,		META_BG)
2122 EXT4_FEATURE_INCOMPAT_FUNCS(extents,		EXTENTS)
2123 EXT4_FEATURE_INCOMPAT_FUNCS(64bit,		64BIT)
2124 EXT4_FEATURE_INCOMPAT_FUNCS(mmp,		MMP)
2125 EXT4_FEATURE_INCOMPAT_FUNCS(flex_bg,		FLEX_BG)
2126 EXT4_FEATURE_INCOMPAT_FUNCS(ea_inode,		EA_INODE)
2127 EXT4_FEATURE_INCOMPAT_FUNCS(dirdata,		DIRDATA)
2128 EXT4_FEATURE_INCOMPAT_FUNCS(csum_seed,		CSUM_SEED)
2129 EXT4_FEATURE_INCOMPAT_FUNCS(largedir,		LARGEDIR)
2130 EXT4_FEATURE_INCOMPAT_FUNCS(inline_data,	INLINE_DATA)
2131 EXT4_FEATURE_INCOMPAT_FUNCS(encrypt,		ENCRYPT)
2132 EXT4_FEATURE_INCOMPAT_FUNCS(casefold,		CASEFOLD)
2133 
2134 #define EXT2_FEATURE_COMPAT_SUPP	EXT4_FEATURE_COMPAT_EXT_ATTR
2135 #define EXT2_FEATURE_INCOMPAT_SUPP	(EXT4_FEATURE_INCOMPAT_FILETYPE| \
2136 					 EXT4_FEATURE_INCOMPAT_META_BG)
2137 #define EXT2_FEATURE_RO_COMPAT_SUPP	(EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
2138 					 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
2139 					 EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
2140 
2141 #define EXT3_FEATURE_COMPAT_SUPP	EXT4_FEATURE_COMPAT_EXT_ATTR
2142 #define EXT3_FEATURE_INCOMPAT_SUPP	(EXT4_FEATURE_INCOMPAT_FILETYPE| \
2143 					 EXT4_FEATURE_INCOMPAT_RECOVER| \
2144 					 EXT4_FEATURE_INCOMPAT_META_BG)
2145 #define EXT3_FEATURE_RO_COMPAT_SUPP	(EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
2146 					 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
2147 					 EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
2148 
2149 #define EXT4_FEATURE_COMPAT_SUPP	(EXT4_FEATURE_COMPAT_EXT_ATTR| \
2150 					 EXT4_FEATURE_COMPAT_ORPHAN_FILE)
2151 #define EXT4_FEATURE_INCOMPAT_SUPP	(EXT4_FEATURE_INCOMPAT_FILETYPE| \
2152 					 EXT4_FEATURE_INCOMPAT_RECOVER| \
2153 					 EXT4_FEATURE_INCOMPAT_META_BG| \
2154 					 EXT4_FEATURE_INCOMPAT_EXTENTS| \
2155 					 EXT4_FEATURE_INCOMPAT_64BIT| \
2156 					 EXT4_FEATURE_INCOMPAT_FLEX_BG| \
2157 					 EXT4_FEATURE_INCOMPAT_EA_INODE| \
2158 					 EXT4_FEATURE_INCOMPAT_MMP | \
2159 					 EXT4_FEATURE_INCOMPAT_INLINE_DATA | \
2160 					 EXT4_FEATURE_INCOMPAT_ENCRYPT | \
2161 					 EXT4_FEATURE_INCOMPAT_CASEFOLD | \
2162 					 EXT4_FEATURE_INCOMPAT_CSUM_SEED | \
2163 					 EXT4_FEATURE_INCOMPAT_LARGEDIR)
2164 #define EXT4_FEATURE_RO_COMPAT_SUPP	(EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
2165 					 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
2166 					 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
2167 					 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
2168 					 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
2169 					 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
2170 					 EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\
2171 					 EXT4_FEATURE_RO_COMPAT_BIGALLOC |\
2172 					 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\
2173 					 EXT4_FEATURE_RO_COMPAT_QUOTA |\
2174 					 EXT4_FEATURE_RO_COMPAT_PROJECT |\
2175 					 EXT4_FEATURE_RO_COMPAT_VERITY |\
2176 					 EXT4_FEATURE_RO_COMPAT_ORPHAN_PRESENT)
2177 
2178 #define EXTN_FEATURE_FUNCS(ver) \
2179 static inline bool ext4_has_unknown_ext##ver##_compat_features(struct super_block *sb) \
2180 { \
2181 	return ((EXT4_SB(sb)->s_es->s_feature_compat & \
2182 		cpu_to_le32(~EXT##ver##_FEATURE_COMPAT_SUPP)) != 0); \
2183 } \
2184 static inline bool ext4_has_unknown_ext##ver##_ro_compat_features(struct super_block *sb) \
2185 { \
2186 	return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \
2187 		cpu_to_le32(~EXT##ver##_FEATURE_RO_COMPAT_SUPP)) != 0); \
2188 } \
2189 static inline bool ext4_has_unknown_ext##ver##_incompat_features(struct super_block *sb) \
2190 { \
2191 	return ((EXT4_SB(sb)->s_es->s_feature_incompat & \
2192 		cpu_to_le32(~EXT##ver##_FEATURE_INCOMPAT_SUPP)) != 0); \
2193 }
2194 
2195 EXTN_FEATURE_FUNCS(2)
2196 EXTN_FEATURE_FUNCS(3)
2197 EXTN_FEATURE_FUNCS(4)
2198 
2199 static inline bool ext4_has_compat_features(struct super_block *sb)
2200 {
2201 	return (EXT4_SB(sb)->s_es->s_feature_compat != 0);
2202 }
ext4_has_ro_compat_features(struct super_block * sb)2203 static inline bool ext4_has_ro_compat_features(struct super_block *sb)
2204 {
2205 	return (EXT4_SB(sb)->s_es->s_feature_ro_compat != 0);
2206 }
ext4_has_incompat_features(struct super_block * sb)2207 static inline bool ext4_has_incompat_features(struct super_block *sb)
2208 {
2209 	return (EXT4_SB(sb)->s_es->s_feature_incompat != 0);
2210 }
2211 
2212 extern int ext4_feature_set_ok(struct super_block *sb, int readonly);
2213 
2214 /*
2215  * Superblock flags
2216  */
2217 #define EXT4_FLAGS_RESIZING	0
2218 #define EXT4_FLAGS_SHUTDOWN	1
2219 #define EXT4_FLAGS_BDEV_IS_DAX	2
2220 
ext4_forced_shutdown(struct ext4_sb_info * sbi)2221 static inline int ext4_forced_shutdown(struct ext4_sb_info *sbi)
2222 {
2223 	return test_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
2224 }
2225 
2226 /*
2227  * Default values for user and/or group using reserved blocks
2228  */
2229 #define	EXT4_DEF_RESUID		0
2230 #define	EXT4_DEF_RESGID		0
2231 
2232 /*
2233  * Default project ID
2234  */
2235 #define	EXT4_DEF_PROJID		0
2236 
2237 #define EXT4_DEF_INODE_READAHEAD_BLKS	32
2238 
2239 /*
2240  * Default mount options
2241  */
2242 #define EXT4_DEFM_DEBUG		0x0001
2243 #define EXT4_DEFM_BSDGROUPS	0x0002
2244 #define EXT4_DEFM_XATTR_USER	0x0004
2245 #define EXT4_DEFM_ACL		0x0008
2246 #define EXT4_DEFM_UID16		0x0010
2247 #define EXT4_DEFM_JMODE		0x0060
2248 #define EXT4_DEFM_JMODE_DATA	0x0020
2249 #define EXT4_DEFM_JMODE_ORDERED	0x0040
2250 #define EXT4_DEFM_JMODE_WBACK	0x0060
2251 #define EXT4_DEFM_NOBARRIER	0x0100
2252 #define EXT4_DEFM_BLOCK_VALIDITY 0x0200
2253 #define EXT4_DEFM_DISCARD	0x0400
2254 #define EXT4_DEFM_NODELALLOC	0x0800
2255 
2256 /*
2257  * Default journal batch times
2258  */
2259 #define EXT4_DEF_MIN_BATCH_TIME	0
2260 #define EXT4_DEF_MAX_BATCH_TIME	15000 /* 15ms */
2261 
2262 /*
2263  * Minimum number of groups in a flexgroup before we separate out
2264  * directories into the first block group of a flexgroup
2265  */
2266 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME	4
2267 
2268 /*
2269  * Structure of a directory entry
2270  */
2271 #define EXT4_NAME_LEN 255
2272 /*
2273  * Base length of the ext4 directory entry excluding the name length
2274  */
2275 #define EXT4_BASE_DIR_LEN (sizeof(struct ext4_dir_entry_2) - EXT4_NAME_LEN)
2276 
2277 struct ext4_dir_entry {
2278 	__le32	inode;			/* Inode number */
2279 	__le16	rec_len;		/* Directory entry length */
2280 	__le16	name_len;		/* Name length */
2281 	char	name[EXT4_NAME_LEN];	/* File name */
2282 };
2283 
2284 
2285 /*
2286  * Encrypted Casefolded entries require saving the hash on disk. This structure
2287  * followed ext4_dir_entry_2's name[name_len] at the next 4 byte aligned
2288  * boundary.
2289  */
2290 struct ext4_dir_entry_hash {
2291 	__le32 hash;
2292 	__le32 minor_hash;
2293 };
2294 
2295 /*
2296  * The new version of the directory entry.  Since EXT4 structures are
2297  * stored in intel byte order, and the name_len field could never be
2298  * bigger than 255 chars, it's safe to reclaim the extra byte for the
2299  * file_type field.
2300  */
2301 struct ext4_dir_entry_2 {
2302 	__le32	inode;			/* Inode number */
2303 	__le16	rec_len;		/* Directory entry length */
2304 	__u8	name_len;		/* Name length */
2305 	__u8	file_type;		/* See file type macros EXT4_FT_* below */
2306 	char	name[EXT4_NAME_LEN];	/* File name */
2307 };
2308 
2309 /*
2310  * Access the hashes at the end of ext4_dir_entry_2
2311  */
2312 #define EXT4_DIRENT_HASHES(entry) \
2313 	((struct ext4_dir_entry_hash *) \
2314 		(((void *)(entry)) + \
2315 		((8 + (entry)->name_len + EXT4_DIR_ROUND) & ~EXT4_DIR_ROUND)))
2316 #define EXT4_DIRENT_HASH(entry) le32_to_cpu(EXT4_DIRENT_HASHES(de)->hash)
2317 #define EXT4_DIRENT_MINOR_HASH(entry) \
2318 		le32_to_cpu(EXT4_DIRENT_HASHES(de)->minor_hash)
2319 
ext4_hash_in_dirent(const struct inode * inode)2320 static inline bool ext4_hash_in_dirent(const struct inode *inode)
2321 {
2322 	return IS_CASEFOLDED(inode) && IS_ENCRYPTED(inode);
2323 }
2324 
2325 /*
2326  * This is a bogus directory entry at the end of each leaf block that
2327  * records checksums.
2328  */
2329 struct ext4_dir_entry_tail {
2330 	__le32	det_reserved_zero1;	/* Pretend to be unused */
2331 	__le16	det_rec_len;		/* 12 */
2332 	__u8	det_reserved_zero2;	/* Zero name length */
2333 	__u8	det_reserved_ft;	/* 0xDE, fake file type */
2334 	__le32	det_checksum;		/* crc32c(uuid+inum+dirblock) */
2335 };
2336 
2337 #define EXT4_DIRENT_TAIL(block, blocksize) \
2338 	((struct ext4_dir_entry_tail *)(((void *)(block)) + \
2339 					((blocksize) - \
2340 					 sizeof(struct ext4_dir_entry_tail))))
2341 
2342 /*
2343  * Ext4 directory file types.  Only the low 3 bits are used.  The
2344  * other bits are reserved for now.
2345  */
2346 #define EXT4_FT_UNKNOWN		0
2347 #define EXT4_FT_REG_FILE	1
2348 #define EXT4_FT_DIR		2
2349 #define EXT4_FT_CHRDEV		3
2350 #define EXT4_FT_BLKDEV		4
2351 #define EXT4_FT_FIFO		5
2352 #define EXT4_FT_SOCK		6
2353 #define EXT4_FT_SYMLINK		7
2354 
2355 #define EXT4_FT_MAX		8
2356 
2357 #define EXT4_FT_DIR_CSUM	0xDE
2358 
2359 /*
2360  * EXT4_DIR_PAD defines the directory entries boundaries
2361  *
2362  * NOTE: It must be a multiple of 4
2363  */
2364 #define EXT4_DIR_PAD			4
2365 #define EXT4_DIR_ROUND			(EXT4_DIR_PAD - 1)
2366 #define EXT4_MAX_REC_LEN		((1<<16)-1)
2367 
2368 /*
2369  * The rec_len is dependent on the type of directory. Directories that are
2370  * casefolded and encrypted need to store the hash as well, so we add room for
2371  * ext4_extended_dir_entry_2. For all entries related to '.' or '..' you should
2372  * pass NULL for dir, as those entries do not use the extra fields.
2373  */
ext4_dir_rec_len(__u8 name_len,const struct inode * dir)2374 static inline unsigned int ext4_dir_rec_len(__u8 name_len,
2375 						const struct inode *dir)
2376 {
2377 	int rec_len = (name_len + 8 + EXT4_DIR_ROUND);
2378 
2379 	if (dir && ext4_hash_in_dirent(dir))
2380 		rec_len += sizeof(struct ext4_dir_entry_hash);
2381 	return (rec_len & ~EXT4_DIR_ROUND);
2382 }
2383 
2384 /*
2385  * If we ever get support for fs block sizes > page_size, we'll need
2386  * to remove the #if statements in the next two functions...
2387  */
2388 static inline unsigned int
ext4_rec_len_from_disk(__le16 dlen,unsigned blocksize)2389 ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize)
2390 {
2391 	unsigned len = le16_to_cpu(dlen);
2392 
2393 #if (PAGE_SIZE >= 65536)
2394 	if (len == EXT4_MAX_REC_LEN || len == 0)
2395 		return blocksize;
2396 	return (len & 65532) | ((len & 3) << 16);
2397 #else
2398 	return len;
2399 #endif
2400 }
2401 
ext4_rec_len_to_disk(unsigned len,unsigned blocksize)2402 static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize)
2403 {
2404 	BUG_ON((len > blocksize) || (blocksize > (1 << 18)) || (len & 3));
2405 #if (PAGE_SIZE >= 65536)
2406 	if (len < 65536)
2407 		return cpu_to_le16(len);
2408 	if (len == blocksize) {
2409 		if (blocksize == 65536)
2410 			return cpu_to_le16(EXT4_MAX_REC_LEN);
2411 		else
2412 			return cpu_to_le16(0);
2413 	}
2414 	return cpu_to_le16((len & 65532) | ((len >> 16) & 3));
2415 #else
2416 	return cpu_to_le16(len);
2417 #endif
2418 }
2419 
2420 /*
2421  * Hash Tree Directory indexing
2422  * (c) Daniel Phillips, 2001
2423  */
2424 
2425 #define is_dx(dir) (ext4_has_feature_dir_index((dir)->i_sb) && \
2426 		    ext4_test_inode_flag((dir), EXT4_INODE_INDEX))
2427 #define EXT4_DIR_LINK_MAX(dir) unlikely((dir)->i_nlink >= EXT4_LINK_MAX && \
2428 		    !(ext4_has_feature_dir_nlink((dir)->i_sb) && is_dx(dir)))
2429 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
2430 
2431 /* Legal values for the dx_root hash_version field: */
2432 
2433 #define DX_HASH_LEGACY			0
2434 #define DX_HASH_HALF_MD4		1
2435 #define DX_HASH_TEA			2
2436 #define DX_HASH_LEGACY_UNSIGNED		3
2437 #define DX_HASH_HALF_MD4_UNSIGNED	4
2438 #define DX_HASH_TEA_UNSIGNED		5
2439 #define DX_HASH_SIPHASH			6
2440 
ext4_chksum(struct ext4_sb_info * sbi,u32 crc,const void * address,unsigned int length)2441 static inline u32 ext4_chksum(struct ext4_sb_info *sbi, u32 crc,
2442 			      const void *address, unsigned int length)
2443 {
2444 	struct {
2445 		struct shash_desc shash;
2446 		char ctx[4];
2447 	} desc;
2448 
2449 	BUG_ON(crypto_shash_descsize(sbi->s_chksum_driver)!=sizeof(desc.ctx));
2450 
2451 	desc.shash.tfm = sbi->s_chksum_driver;
2452 	*(u32 *)desc.ctx = crc;
2453 
2454 	BUG_ON(crypto_shash_update(&desc.shash, address, length));
2455 
2456 	return *(u32 *)desc.ctx;
2457 }
2458 
2459 #ifdef __KERNEL__
2460 
2461 /* hash info structure used by the directory hash */
2462 struct dx_hash_info
2463 {
2464 	u32		hash;
2465 	u32		minor_hash;
2466 	int		hash_version;
2467 	u32		*seed;
2468 };
2469 
2470 
2471 /* 32 and 64 bit signed EOF for dx directories */
2472 #define EXT4_HTREE_EOF_32BIT   ((1UL  << (32 - 1)) - 1)
2473 #define EXT4_HTREE_EOF_64BIT   ((1ULL << (64 - 1)) - 1)
2474 
2475 
2476 /*
2477  * Control parameters used by ext4_htree_next_block
2478  */
2479 #define HASH_NB_ALWAYS		1
2480 
2481 struct ext4_filename {
2482 	const struct qstr *usr_fname;
2483 	struct fscrypt_str disk_name;
2484 	struct dx_hash_info hinfo;
2485 #ifdef CONFIG_FS_ENCRYPTION
2486 	struct fscrypt_str crypto_buf;
2487 #endif
2488 #if IS_ENABLED(CONFIG_UNICODE)
2489 	struct fscrypt_str cf_name;
2490 #endif
2491 };
2492 
2493 #define fname_name(p) ((p)->disk_name.name)
2494 #define fname_usr_name(p) ((p)->usr_fname->name)
2495 #define fname_len(p)  ((p)->disk_name.len)
2496 
2497 /*
2498  * Describe an inode's exact location on disk and in memory
2499  */
2500 struct ext4_iloc
2501 {
2502 	struct buffer_head *bh;
2503 	unsigned long offset;
2504 	ext4_group_t block_group;
2505 };
2506 
ext4_raw_inode(struct ext4_iloc * iloc)2507 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
2508 {
2509 	return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
2510 }
2511 
ext4_is_quota_file(struct inode * inode)2512 static inline bool ext4_is_quota_file(struct inode *inode)
2513 {
2514 	return IS_NOQUOTA(inode) &&
2515 	       !(EXT4_I(inode)->i_flags & EXT4_EA_INODE_FL);
2516 }
2517 
2518 /*
2519  * This structure is stuffed into the struct file's private_data field
2520  * for directories.  It is where we put information so that we can do
2521  * readdir operations in hash tree order.
2522  */
2523 struct dir_private_info {
2524 	struct rb_root	root;
2525 	struct rb_node	*curr_node;
2526 	struct fname	*extra_fname;
2527 	loff_t		last_pos;
2528 	__u32		curr_hash;
2529 	__u32		curr_minor_hash;
2530 	__u32		next_hash;
2531 };
2532 
2533 /* calculate the first block number of the group */
2534 static inline ext4_fsblk_t
ext4_group_first_block_no(struct super_block * sb,ext4_group_t group_no)2535 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no)
2536 {
2537 	return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
2538 		le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
2539 }
2540 
2541 /*
2542  * Special error return code only used by dx_probe() and its callers.
2543  */
2544 #define ERR_BAD_DX_DIR	(-(MAX_ERRNO - 1))
2545 
2546 /* htree levels for ext4 */
2547 #define	EXT4_HTREE_LEVEL_COMPAT	2
2548 #define	EXT4_HTREE_LEVEL	3
2549 
ext4_dir_htree_level(struct super_block * sb)2550 static inline int ext4_dir_htree_level(struct super_block *sb)
2551 {
2552 	return ext4_has_feature_largedir(sb) ?
2553 		EXT4_HTREE_LEVEL : EXT4_HTREE_LEVEL_COMPAT;
2554 }
2555 
2556 /*
2557  * Timeout and state flag for lazy initialization inode thread.
2558  */
2559 #define EXT4_DEF_LI_WAIT_MULT			10
2560 #define EXT4_DEF_LI_MAX_START_DELAY		5
2561 #define EXT4_LAZYINIT_QUIT			0x0001
2562 #define EXT4_LAZYINIT_RUNNING			0x0002
2563 
2564 /*
2565  * Lazy inode table initialization info
2566  */
2567 struct ext4_lazy_init {
2568 	unsigned long		li_state;
2569 	struct list_head	li_request_list;
2570 	struct mutex		li_list_mtx;
2571 };
2572 
2573 enum ext4_li_mode {
2574 	EXT4_LI_MODE_PREFETCH_BBITMAP,
2575 	EXT4_LI_MODE_ITABLE,
2576 };
2577 
2578 struct ext4_li_request {
2579 	struct super_block	*lr_super;
2580 	enum ext4_li_mode	lr_mode;
2581 	ext4_group_t		lr_first_not_zeroed;
2582 	ext4_group_t		lr_next_group;
2583 	struct list_head	lr_request;
2584 	unsigned long		lr_next_sched;
2585 	unsigned long		lr_timeout;
2586 };
2587 
2588 struct ext4_features {
2589 	struct kobject f_kobj;
2590 	struct completion f_kobj_unregister;
2591 };
2592 
2593 /*
2594  * This structure will be used for multiple mount protection. It will be
2595  * written into the block number saved in the s_mmp_block field in the
2596  * superblock. Programs that check MMP should assume that if
2597  * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe
2598  * to use the filesystem, regardless of how old the timestamp is.
2599  */
2600 #define EXT4_MMP_MAGIC     0x004D4D50U /* ASCII for MMP */
2601 #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */
2602 #define EXT4_MMP_SEQ_FSCK  0xE24D4D50U /* mmp_seq value when being fscked */
2603 #define EXT4_MMP_SEQ_MAX   0xE24D4D4FU /* maximum valid mmp_seq value */
2604 
2605 struct mmp_struct {
2606 	__le32	mmp_magic;		/* Magic number for MMP */
2607 	__le32	mmp_seq;		/* Sequence no. updated periodically */
2608 
2609 	/*
2610 	 * mmp_time, mmp_nodename & mmp_bdevname are only used for information
2611 	 * purposes and do not affect the correctness of the algorithm
2612 	 */
2613 	__le64	mmp_time;		/* Time last updated */
2614 	char	mmp_nodename[64];	/* Node which last updated MMP block */
2615 	char	mmp_bdevname[32];	/* Bdev which last updated MMP block */
2616 
2617 	/*
2618 	 * mmp_check_interval is used to verify if the MMP block has been
2619 	 * updated on the block device. The value is updated based on the
2620 	 * maximum time to write the MMP block during an update cycle.
2621 	 */
2622 	__le16	mmp_check_interval;
2623 
2624 	__le16	mmp_pad1;
2625 	__le32	mmp_pad2[226];
2626 	__le32	mmp_checksum;		/* crc32c(uuid+mmp_block) */
2627 };
2628 
2629 /* arguments passed to the mmp thread */
2630 struct mmpd_data {
2631 	struct buffer_head *bh; /* bh from initial read_mmp_block() */
2632 	struct super_block *sb;  /* super block of the fs */
2633 };
2634 
2635 /*
2636  * Check interval multiplier
2637  * The MMP block is written every update interval and initially checked every
2638  * update interval x the multiplier (the value is then adapted based on the
2639  * write latency). The reason is that writes can be delayed under load and we
2640  * don't want readers to incorrectly assume that the filesystem is no longer
2641  * in use.
2642  */
2643 #define EXT4_MMP_CHECK_MULT		2UL
2644 
2645 /*
2646  * Minimum interval for MMP checking in seconds.
2647  */
2648 #define EXT4_MMP_MIN_CHECK_INTERVAL	5UL
2649 
2650 /*
2651  * Maximum interval for MMP checking in seconds.
2652  */
2653 #define EXT4_MMP_MAX_CHECK_INTERVAL	300UL
2654 
2655 /*
2656  * Function prototypes
2657  */
2658 
2659 /*
2660  * Ok, these declarations are also in <linux/kernel.h> but none of the
2661  * ext4 source programs needs to include it so they are duplicated here.
2662  */
2663 # define NORET_TYPE	/**/
2664 # define ATTRIB_NORET	__attribute__((noreturn))
2665 # define NORET_AND	noreturn,
2666 
2667 /* bitmap.c */
2668 extern unsigned int ext4_count_free(char *bitmap, unsigned numchars);
2669 void ext4_inode_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
2670 				struct ext4_group_desc *gdp,
2671 				struct buffer_head *bh, int sz);
2672 int ext4_inode_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
2673 				  struct ext4_group_desc *gdp,
2674 				  struct buffer_head *bh, int sz);
2675 void ext4_block_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
2676 				struct ext4_group_desc *gdp,
2677 				struct buffer_head *bh);
2678 int ext4_block_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
2679 				  struct ext4_group_desc *gdp,
2680 				  struct buffer_head *bh);
2681 
2682 /* balloc.c */
2683 extern void ext4_get_group_no_and_offset(struct super_block *sb,
2684 					 ext4_fsblk_t blocknr,
2685 					 ext4_group_t *blockgrpp,
2686 					 ext4_grpblk_t *offsetp);
2687 extern ext4_group_t ext4_get_group_number(struct super_block *sb,
2688 					  ext4_fsblk_t block);
2689 
2690 extern unsigned int ext4_block_group(struct super_block *sb,
2691 			ext4_fsblk_t blocknr);
2692 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb,
2693 			ext4_fsblk_t blocknr);
2694 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group);
2695 extern unsigned long ext4_bg_num_gdb(struct super_block *sb,
2696 			ext4_group_t group);
2697 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,
2698 					 ext4_fsblk_t goal,
2699 					 unsigned int flags,
2700 					 unsigned long *count,
2701 					 int *errp);
2702 extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi,
2703 				    s64 nclusters, unsigned int flags);
2704 extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *);
2705 extern void ext4_check_blocks_bitmap(struct super_block *);
2706 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
2707 						    ext4_group_t block_group,
2708 						    struct buffer_head ** bh);
2709 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
2710 
2711 extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb,
2712 						ext4_group_t block_group,
2713 						bool ignore_locked);
2714 extern int ext4_wait_block_bitmap(struct super_block *sb,
2715 				  ext4_group_t block_group,
2716 				  struct buffer_head *bh);
2717 extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb,
2718 						  ext4_group_t block_group);
2719 extern unsigned ext4_free_clusters_after_init(struct super_block *sb,
2720 					      ext4_group_t block_group,
2721 					      struct ext4_group_desc *gdp);
2722 ext4_fsblk_t ext4_inode_to_goal_block(struct inode *);
2723 
2724 #if IS_ENABLED(CONFIG_UNICODE)
2725 extern int ext4_fname_setup_ci_filename(struct inode *dir,
2726 					 const struct qstr *iname,
2727 					 struct ext4_filename *fname);
2728 #endif
2729 
2730 /* ext4 encryption related stuff goes here crypto.c */
2731 #ifdef CONFIG_FS_ENCRYPTION
2732 extern const struct fscrypt_operations ext4_cryptops;
2733 
2734 int ext4_fname_setup_filename(struct inode *dir, const struct qstr *iname,
2735 			      int lookup, struct ext4_filename *fname);
2736 
2737 int ext4_fname_prepare_lookup(struct inode *dir, struct dentry *dentry,
2738 			      struct ext4_filename *fname);
2739 
2740 void ext4_fname_free_filename(struct ext4_filename *fname);
2741 
2742 int ext4_ioctl_get_encryption_pwsalt(struct file *filp, void __user *arg);
2743 
2744 #else /* !CONFIG_FS_ENCRYPTION */
ext4_fname_setup_filename(struct inode * dir,const struct qstr * iname,int lookup,struct ext4_filename * fname)2745 static inline int ext4_fname_setup_filename(struct inode *dir,
2746 					    const struct qstr *iname,
2747 					    int lookup,
2748 					    struct ext4_filename *fname)
2749 {
2750 	int err = 0;
2751 	fname->usr_fname = iname;
2752 	fname->disk_name.name = (unsigned char *) iname->name;
2753 	fname->disk_name.len = iname->len;
2754 
2755 #if IS_ENABLED(CONFIG_UNICODE)
2756 	err = ext4_fname_setup_ci_filename(dir, iname, fname);
2757 #endif
2758 
2759 	return err;
2760 }
2761 
ext4_fname_prepare_lookup(struct inode * dir,struct dentry * dentry,struct ext4_filename * fname)2762 static inline int ext4_fname_prepare_lookup(struct inode *dir,
2763 					    struct dentry *dentry,
2764 					    struct ext4_filename *fname)
2765 {
2766 	return ext4_fname_setup_filename(dir, &dentry->d_name, 1, fname);
2767 }
2768 
ext4_fname_free_filename(struct ext4_filename * fname)2769 static inline void ext4_fname_free_filename(struct ext4_filename *fname)
2770 {
2771 #if IS_ENABLED(CONFIG_UNICODE)
2772 	kfree(fname->cf_name.name);
2773 	fname->cf_name.name = NULL;
2774 #endif
2775 }
2776 
ext4_ioctl_get_encryption_pwsalt(struct file * filp,void __user * arg)2777 static inline int ext4_ioctl_get_encryption_pwsalt(struct file *filp,
2778 						   void __user *arg)
2779 {
2780 	return -EOPNOTSUPP;
2781 }
2782 #endif /* !CONFIG_FS_ENCRYPTION */
2783 
2784 /* dir.c */
2785 extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *,
2786 				  struct file *,
2787 				  struct ext4_dir_entry_2 *,
2788 				  struct buffer_head *, char *, int,
2789 				  unsigned int);
2790 #define ext4_check_dir_entry(dir, filp, de, bh, buf, size, offset) \
2791 	unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \
2792 				(de), (bh), (buf), (size), (offset)))
2793 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
2794 				__u32 minor_hash,
2795 				struct ext4_dir_entry_2 *dirent,
2796 				struct fscrypt_str *ent_name);
2797 extern void ext4_htree_free_dir_info(struct dir_private_info *p);
2798 extern int ext4_find_dest_de(struct inode *dir, struct inode *inode,
2799 			     struct buffer_head *bh,
2800 			     void *buf, int buf_size,
2801 			     struct ext4_filename *fname,
2802 			     struct ext4_dir_entry_2 **dest_de);
2803 void ext4_insert_dentry(struct inode *dir, struct inode *inode,
2804 			struct ext4_dir_entry_2 *de,
2805 			int buf_size,
2806 			struct ext4_filename *fname);
ext4_update_dx_flag(struct inode * inode)2807 static inline void ext4_update_dx_flag(struct inode *inode)
2808 {
2809 	if (!ext4_has_feature_dir_index(inode->i_sb) &&
2810 	    ext4_test_inode_flag(inode, EXT4_INODE_INDEX)) {
2811 		/* ext4_iget() should have caught this... */
2812 		WARN_ON_ONCE(ext4_has_feature_metadata_csum(inode->i_sb));
2813 		ext4_clear_inode_flag(inode, EXT4_INODE_INDEX);
2814 	}
2815 }
2816 static const unsigned char ext4_filetype_table[] = {
2817 	DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK
2818 };
2819 
get_dtype(struct super_block * sb,int filetype)2820 static inline  unsigned char get_dtype(struct super_block *sb, int filetype)
2821 {
2822 	if (!ext4_has_feature_filetype(sb) || filetype >= EXT4_FT_MAX)
2823 		return DT_UNKNOWN;
2824 
2825 	return ext4_filetype_table[filetype];
2826 }
2827 extern int ext4_check_all_de(struct inode *dir, struct buffer_head *bh,
2828 			     void *buf, int buf_size);
2829 
2830 /* fsync.c */
2831 extern int ext4_sync_file(struct file *, loff_t, loff_t, int);
2832 
2833 /* hash.c */
2834 extern int ext4fs_dirhash(const struct inode *dir, const char *name, int len,
2835 			  struct dx_hash_info *hinfo);
2836 
2837 /* ialloc.c */
2838 extern int ext4_mark_inode_used(struct super_block *sb, int ino);
2839 extern struct inode *__ext4_new_inode(struct user_namespace *, handle_t *,
2840 				      struct inode *, umode_t,
2841 				      const struct qstr *qstr, __u32 goal,
2842 				      uid_t *owner, __u32 i_flags,
2843 				      int handle_type, unsigned int line_no,
2844 				      int nblocks);
2845 
2846 #define ext4_new_inode(handle, dir, mode, qstr, goal, owner, i_flags)          \
2847 	__ext4_new_inode(&init_user_ns, (handle), (dir), (mode), (qstr),       \
2848 			 (goal), (owner), i_flags, 0, 0, 0)
2849 #define ext4_new_inode_start_handle(mnt_userns, dir, mode, qstr, goal, owner, \
2850 				    type, nblocks)		    \
2851 	__ext4_new_inode((mnt_userns), NULL, (dir), (mode), (qstr), (goal), (owner), \
2852 			 0, (type), __LINE__, (nblocks))
2853 
2854 
2855 extern void ext4_free_inode(handle_t *, struct inode *);
2856 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long);
2857 extern unsigned long ext4_count_free_inodes(struct super_block *);
2858 extern unsigned long ext4_count_dirs(struct super_block *);
2859 extern void ext4_check_inodes_bitmap(struct super_block *);
2860 extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap);
2861 extern int ext4_init_inode_table(struct super_block *sb,
2862 				 ext4_group_t group, int barrier);
2863 extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate);
2864 
2865 /* fast_commit.c */
2866 int ext4_fc_info_show(struct seq_file *seq, void *v);
2867 void ext4_fc_init(struct super_block *sb, journal_t *journal);
2868 void ext4_fc_init_inode(struct inode *inode);
2869 void ext4_fc_track_range(handle_t *handle, struct inode *inode, ext4_lblk_t start,
2870 			 ext4_lblk_t end);
2871 void __ext4_fc_track_unlink(handle_t *handle, struct inode *inode,
2872 	struct dentry *dentry);
2873 void __ext4_fc_track_link(handle_t *handle, struct inode *inode,
2874 	struct dentry *dentry);
2875 void ext4_fc_track_unlink(handle_t *handle, struct dentry *dentry);
2876 void ext4_fc_track_link(handle_t *handle, struct dentry *dentry);
2877 void __ext4_fc_track_create(handle_t *handle, struct inode *inode,
2878 			    struct dentry *dentry);
2879 void ext4_fc_track_create(handle_t *handle, struct dentry *dentry);
2880 void ext4_fc_track_inode(handle_t *handle, struct inode *inode);
2881 void ext4_fc_mark_ineligible(struct super_block *sb, int reason, handle_t *handle);
2882 void ext4_fc_start_update(struct inode *inode);
2883 void ext4_fc_stop_update(struct inode *inode);
2884 void ext4_fc_del(struct inode *inode);
2885 bool ext4_fc_replay_check_excluded(struct super_block *sb, ext4_fsblk_t block);
2886 void ext4_fc_replay_cleanup(struct super_block *sb);
2887 int ext4_fc_commit(journal_t *journal, tid_t commit_tid);
2888 int __init ext4_fc_init_dentry_cache(void);
2889 void ext4_fc_destroy_dentry_cache(void);
2890 int ext4_fc_record_regions(struct super_block *sb, int ino,
2891 			   ext4_lblk_t lblk, ext4_fsblk_t pblk,
2892 			   int len, int replay);
2893 
2894 /* mballoc.c */
2895 extern const struct seq_operations ext4_mb_seq_groups_ops;
2896 extern const struct seq_operations ext4_mb_seq_structs_summary_ops;
2897 extern long ext4_mb_stats;
2898 extern long ext4_mb_max_to_scan;
2899 extern int ext4_seq_mb_stats_show(struct seq_file *seq, void *offset);
2900 extern int ext4_mb_init(struct super_block *);
2901 extern int ext4_mb_release(struct super_block *);
2902 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *,
2903 				struct ext4_allocation_request *, int *);
2904 extern int ext4_mb_reserve_blocks(struct super_block *, int);
2905 extern void ext4_discard_preallocations(struct inode *, unsigned int);
2906 extern int __init ext4_init_mballoc(void);
2907 extern void ext4_exit_mballoc(void);
2908 extern ext4_group_t ext4_mb_prefetch(struct super_block *sb,
2909 				     ext4_group_t group,
2910 				     unsigned int nr, int *cnt);
2911 extern void ext4_mb_prefetch_fini(struct super_block *sb, ext4_group_t group,
2912 				  unsigned int nr);
2913 
2914 extern void ext4_free_blocks(handle_t *handle, struct inode *inode,
2915 			     struct buffer_head *bh, ext4_fsblk_t block,
2916 			     unsigned long count, int flags);
2917 extern int ext4_mb_alloc_groupinfo(struct super_block *sb,
2918 				   ext4_group_t ngroups);
2919 extern int ext4_mb_add_groupinfo(struct super_block *sb,
2920 		ext4_group_t i, struct ext4_group_desc *desc);
2921 extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb,
2922 				ext4_fsblk_t block, unsigned long count);
2923 extern int ext4_trim_fs(struct super_block *, struct fstrim_range *);
2924 extern void ext4_process_freed_data(struct super_block *sb, tid_t commit_tid);
2925 extern void ext4_mb_mark_bb(struct super_block *sb, ext4_fsblk_t block,
2926 		       int len, int state);
2927 
2928 /* inode.c */
2929 void ext4_inode_csum_set(struct inode *inode, struct ext4_inode *raw,
2930 			 struct ext4_inode_info *ei);
2931 int ext4_inode_is_fast_symlink(struct inode *inode);
2932 struct buffer_head *ext4_getblk(handle_t *, struct inode *, ext4_lblk_t, int);
2933 struct buffer_head *ext4_bread(handle_t *, struct inode *, ext4_lblk_t, int);
2934 int ext4_bread_batch(struct inode *inode, ext4_lblk_t block, int bh_count,
2935 		     bool wait, struct buffer_head **bhs);
2936 int ext4_get_block_unwritten(struct inode *inode, sector_t iblock,
2937 			     struct buffer_head *bh_result, int create);
2938 int ext4_get_block(struct inode *inode, sector_t iblock,
2939 		   struct buffer_head *bh_result, int create);
2940 int ext4_da_get_block_prep(struct inode *inode, sector_t iblock,
2941 			   struct buffer_head *bh, int create);
2942 int ext4_walk_page_buffers(handle_t *handle,
2943 			   struct inode *inode,
2944 			   struct buffer_head *head,
2945 			   unsigned from,
2946 			   unsigned to,
2947 			   int *partial,
2948 			   int (*fn)(handle_t *handle, struct inode *inode,
2949 				     struct buffer_head *bh));
2950 int do_journal_get_write_access(handle_t *handle, struct inode *inode,
2951 				struct buffer_head *bh);
2952 #define FALL_BACK_TO_NONDELALLOC 1
2953 #define CONVERT_INLINE_DATA	 2
2954 
2955 typedef enum {
2956 	EXT4_IGET_NORMAL =	0,
2957 	EXT4_IGET_SPECIAL =	0x0001, /* OK to iget a system inode */
2958 	EXT4_IGET_HANDLE = 	0x0002	/* Inode # is from a handle */
2959 } ext4_iget_flags;
2960 
2961 extern struct inode *__ext4_iget(struct super_block *sb, unsigned long ino,
2962 				 ext4_iget_flags flags, const char *function,
2963 				 unsigned int line);
2964 
2965 #define ext4_iget(sb, ino, flags) \
2966 	__ext4_iget((sb), (ino), (flags), __func__, __LINE__)
2967 
2968 extern int  ext4_write_inode(struct inode *, struct writeback_control *);
2969 extern int  ext4_setattr(struct user_namespace *, struct dentry *,
2970 			 struct iattr *);
2971 extern int  ext4_getattr(struct user_namespace *, const struct path *,
2972 			 struct kstat *, u32, unsigned int);
2973 extern void ext4_evict_inode(struct inode *);
2974 extern void ext4_clear_inode(struct inode *);
2975 extern int  ext4_file_getattr(struct user_namespace *, const struct path *,
2976 			      struct kstat *, u32, unsigned int);
2977 extern int  ext4_sync_inode(handle_t *, struct inode *);
2978 extern void ext4_dirty_inode(struct inode *, int);
2979 extern int ext4_change_inode_journal_flag(struct inode *, int);
2980 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
2981 extern int ext4_get_fc_inode_loc(struct super_block *sb, unsigned long ino,
2982 			  struct ext4_iloc *iloc);
2983 extern int ext4_inode_attach_jinode(struct inode *inode);
2984 extern int ext4_can_truncate(struct inode *inode);
2985 extern int ext4_truncate(struct inode *);
2986 extern int ext4_break_layouts(struct inode *);
2987 extern int ext4_punch_hole(struct file *file, loff_t offset, loff_t length);
2988 extern void ext4_set_inode_flags(struct inode *, bool init);
2989 extern int ext4_alloc_da_blocks(struct inode *inode);
2990 extern void ext4_set_aops(struct inode *inode);
2991 extern int ext4_writepage_trans_blocks(struct inode *);
2992 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks);
2993 extern int ext4_zero_partial_blocks(handle_t *handle, struct inode *inode,
2994 			     loff_t lstart, loff_t lend);
2995 extern vm_fault_t ext4_page_mkwrite(struct vm_fault *vmf);
2996 extern qsize_t *ext4_get_reserved_space(struct inode *inode);
2997 extern int ext4_get_projid(struct inode *inode, kprojid_t *projid);
2998 extern void ext4_da_release_space(struct inode *inode, int to_free);
2999 extern void ext4_da_update_reserve_space(struct inode *inode,
3000 					int used, int quota_claim);
3001 extern int ext4_issue_zeroout(struct inode *inode, ext4_lblk_t lblk,
3002 			      ext4_fsblk_t pblk, ext4_lblk_t len);
3003 
3004 /* indirect.c */
3005 extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode,
3006 				struct ext4_map_blocks *map, int flags);
3007 extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks);
3008 extern void ext4_ind_truncate(handle_t *, struct inode *inode);
3009 extern int ext4_ind_remove_space(handle_t *handle, struct inode *inode,
3010 				 ext4_lblk_t start, ext4_lblk_t end);
3011 
3012 /* ioctl.c */
3013 extern long ext4_ioctl(struct file *, unsigned int, unsigned long);
3014 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long);
3015 int ext4_fileattr_set(struct user_namespace *mnt_userns,
3016 		      struct dentry *dentry, struct fileattr *fa);
3017 int ext4_fileattr_get(struct dentry *dentry, struct fileattr *fa);
3018 extern void ext4_reset_inode_seed(struct inode *inode);
3019 int ext4_update_overhead(struct super_block *sb);
3020 
3021 /* migrate.c */
3022 extern int ext4_ext_migrate(struct inode *);
3023 extern int ext4_ind_migrate(struct inode *inode);
3024 
3025 /* namei.c */
3026 extern int ext4_init_new_dir(handle_t *handle, struct inode *dir,
3027 			     struct inode *inode);
3028 extern int ext4_dirblock_csum_verify(struct inode *inode,
3029 				     struct buffer_head *bh);
3030 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
3031 				__u32 start_minor_hash, __u32 *next_hash);
3032 extern int ext4_search_dir(struct buffer_head *bh,
3033 			   char *search_buf,
3034 			   int buf_size,
3035 			   struct inode *dir,
3036 			   struct ext4_filename *fname,
3037 			   unsigned int offset,
3038 			   struct ext4_dir_entry_2 **res_dir);
3039 extern int ext4_generic_delete_entry(struct inode *dir,
3040 				     struct ext4_dir_entry_2 *de_del,
3041 				     struct buffer_head *bh,
3042 				     void *entry_buf,
3043 				     int buf_size,
3044 				     int csum_size);
3045 extern bool ext4_empty_dir(struct inode *inode);
3046 
3047 /* resize.c */
3048 extern void ext4_kvfree_array_rcu(void *to_free);
3049 extern int ext4_group_add(struct super_block *sb,
3050 				struct ext4_new_group_data *input);
3051 extern int ext4_group_extend(struct super_block *sb,
3052 				struct ext4_super_block *es,
3053 				ext4_fsblk_t n_blocks_count);
3054 extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count);
3055 extern unsigned int ext4_list_backups(struct super_block *sb,
3056 				      unsigned int *three, unsigned int *five,
3057 				      unsigned int *seven);
3058 
3059 /* super.c */
3060 extern struct buffer_head *ext4_sb_bread(struct super_block *sb,
3061 					 sector_t block, int op_flags);
3062 extern struct buffer_head *ext4_sb_bread_unmovable(struct super_block *sb,
3063 						   sector_t block);
3064 extern void ext4_read_bh_nowait(struct buffer_head *bh, int op_flags,
3065 				bh_end_io_t *end_io);
3066 extern int ext4_read_bh(struct buffer_head *bh, int op_flags,
3067 			bh_end_io_t *end_io);
3068 extern int ext4_read_bh_lock(struct buffer_head *bh, int op_flags, bool wait);
3069 extern void ext4_sb_breadahead_unmovable(struct super_block *sb, sector_t block);
3070 extern int ext4_seq_options_show(struct seq_file *seq, void *offset);
3071 extern int ext4_calculate_overhead(struct super_block *sb);
3072 extern __le32 ext4_superblock_csum(struct super_block *sb,
3073 				   struct ext4_super_block *es);
3074 extern void ext4_superblock_csum_set(struct super_block *sb);
3075 extern int ext4_alloc_flex_bg_array(struct super_block *sb,
3076 				    ext4_group_t ngroup);
3077 extern const char *ext4_decode_error(struct super_block *sb, int errno,
3078 				     char nbuf[16]);
3079 extern void ext4_mark_group_bitmap_corrupted(struct super_block *sb,
3080 					     ext4_group_t block_group,
3081 					     unsigned int flags);
3082 
3083 extern __printf(7, 8)
3084 void __ext4_error(struct super_block *, const char *, unsigned int, bool,
3085 		  int, __u64, const char *, ...);
3086 extern __printf(6, 7)
3087 void __ext4_error_inode(struct inode *, const char *, unsigned int,
3088 			ext4_fsblk_t, int, const char *, ...);
3089 extern __printf(5, 6)
3090 void __ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t,
3091 		     const char *, ...);
3092 extern void __ext4_std_error(struct super_block *, const char *,
3093 			     unsigned int, int);
3094 extern __printf(4, 5)
3095 void __ext4_warning(struct super_block *, const char *, unsigned int,
3096 		    const char *, ...);
3097 extern __printf(4, 5)
3098 void __ext4_warning_inode(const struct inode *inode, const char *function,
3099 			  unsigned int line, const char *fmt, ...);
3100 extern __printf(3, 4)
3101 void __ext4_msg(struct super_block *, const char *, const char *, ...);
3102 extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp,
3103 			   const char *, unsigned int, const char *);
3104 extern __printf(7, 8)
3105 void __ext4_grp_locked_error(const char *, unsigned int,
3106 			     struct super_block *, ext4_group_t,
3107 			     unsigned long, ext4_fsblk_t,
3108 			     const char *, ...);
3109 
3110 #define EXT4_ERROR_INODE(inode, fmt, a...) \
3111 	ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a)
3112 
3113 #define EXT4_ERROR_INODE_ERR(inode, err, fmt, a...)			\
3114 	__ext4_error_inode((inode), __func__, __LINE__, 0, (err), (fmt), ## a)
3115 
3116 #define ext4_error_inode_block(inode, block, err, fmt, a...)		\
3117 	__ext4_error_inode((inode), __func__, __LINE__, (block), (err),	\
3118 			   (fmt), ## a)
3119 
3120 #define EXT4_ERROR_FILE(file, block, fmt, a...)				\
3121 	ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a)
3122 
3123 #define ext4_abort(sb, err, fmt, a...)					\
3124 	__ext4_error((sb), __func__, __LINE__, true, (err), 0, (fmt), ## a)
3125 
3126 #ifdef CONFIG_PRINTK
3127 
3128 #define ext4_error_inode(inode, func, line, block, fmt, ...)		\
3129 	__ext4_error_inode(inode, func, line, block, 0, fmt, ##__VA_ARGS__)
3130 #define ext4_error_inode_err(inode, func, line, block, err, fmt, ...)	\
3131 	__ext4_error_inode((inode), (func), (line), (block), 		\
3132 			   (err), (fmt), ##__VA_ARGS__)
3133 #define ext4_error_file(file, func, line, block, fmt, ...)		\
3134 	__ext4_error_file(file, func, line, block, fmt, ##__VA_ARGS__)
3135 #define ext4_error(sb, fmt, ...)					\
3136 	__ext4_error((sb), __func__, __LINE__, false, 0, 0, (fmt),	\
3137 		##__VA_ARGS__)
3138 #define ext4_error_err(sb, err, fmt, ...)				\
3139 	__ext4_error((sb), __func__, __LINE__, false, (err), 0, (fmt),	\
3140 		##__VA_ARGS__)
3141 #define ext4_warning(sb, fmt, ...)					\
3142 	__ext4_warning(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
3143 #define ext4_warning_inode(inode, fmt, ...)				\
3144 	__ext4_warning_inode(inode, __func__, __LINE__, fmt, ##__VA_ARGS__)
3145 #define ext4_msg(sb, level, fmt, ...)				\
3146 	__ext4_msg(sb, level, fmt, ##__VA_ARGS__)
3147 #define dump_mmp_msg(sb, mmp, msg)					\
3148 	__dump_mmp_msg(sb, mmp, __func__, __LINE__, msg)
3149 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...)		\
3150 	__ext4_grp_locked_error(__func__, __LINE__, sb, grp, ino, block, \
3151 				fmt, ##__VA_ARGS__)
3152 
3153 #else
3154 
3155 #define ext4_error_inode(inode, func, line, block, fmt, ...)		\
3156 do {									\
3157 	no_printk(fmt, ##__VA_ARGS__);					\
3158 	__ext4_error_inode(inode, "", 0, block, 0, " ");		\
3159 } while (0)
3160 #define ext4_error_inode_err(inode, func, line, block, err, fmt, ...)	\
3161 do {									\
3162 	no_printk(fmt, ##__VA_ARGS__);					\
3163 	__ext4_error_inode(inode, "", 0, block, err, " ");		\
3164 } while (0)
3165 #define ext4_error_file(file, func, line, block, fmt, ...)		\
3166 do {									\
3167 	no_printk(fmt, ##__VA_ARGS__);					\
3168 	__ext4_error_file(file, "", 0, block, " ");			\
3169 } while (0)
3170 #define ext4_error(sb, fmt, ...)					\
3171 do {									\
3172 	no_printk(fmt, ##__VA_ARGS__);					\
3173 	__ext4_error(sb, "", 0, false, 0, 0, " ");			\
3174 } while (0)
3175 #define ext4_error_err(sb, err, fmt, ...)				\
3176 do {									\
3177 	no_printk(fmt, ##__VA_ARGS__);					\
3178 	__ext4_error(sb, "", 0, false, err, 0, " ");			\
3179 } while (0)
3180 #define ext4_warning(sb, fmt, ...)					\
3181 do {									\
3182 	no_printk(fmt, ##__VA_ARGS__);					\
3183 	__ext4_warning(sb, "", 0, " ");					\
3184 } while (0)
3185 #define ext4_warning_inode(inode, fmt, ...)				\
3186 do {									\
3187 	no_printk(fmt, ##__VA_ARGS__);					\
3188 	__ext4_warning_inode(inode, "", 0, " ");			\
3189 } while (0)
3190 #define ext4_msg(sb, level, fmt, ...)					\
3191 do {									\
3192 	no_printk(fmt, ##__VA_ARGS__);					\
3193 	__ext4_msg(sb, "", " ");					\
3194 } while (0)
3195 #define dump_mmp_msg(sb, mmp, msg)					\
3196 	__dump_mmp_msg(sb, mmp, "", 0, "")
3197 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...)		\
3198 do {									\
3199 	no_printk(fmt, ##__VA_ARGS__);				\
3200 	__ext4_grp_locked_error("", 0, sb, grp, ino, block, " ");	\
3201 } while (0)
3202 
3203 #endif
3204 
3205 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
3206 				      struct ext4_group_desc *bg);
3207 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
3208 				      struct ext4_group_desc *bg);
3209 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
3210 				     struct ext4_group_desc *bg);
3211 extern __u32 ext4_free_group_clusters(struct super_block *sb,
3212 				      struct ext4_group_desc *bg);
3213 extern __u32 ext4_free_inodes_count(struct super_block *sb,
3214 				 struct ext4_group_desc *bg);
3215 extern __u32 ext4_used_dirs_count(struct super_block *sb,
3216 				struct ext4_group_desc *bg);
3217 extern __u32 ext4_itable_unused_count(struct super_block *sb,
3218 				   struct ext4_group_desc *bg);
3219 extern void ext4_block_bitmap_set(struct super_block *sb,
3220 				  struct ext4_group_desc *bg, ext4_fsblk_t blk);
3221 extern void ext4_inode_bitmap_set(struct super_block *sb,
3222 				  struct ext4_group_desc *bg, ext4_fsblk_t blk);
3223 extern void ext4_inode_table_set(struct super_block *sb,
3224 				 struct ext4_group_desc *bg, ext4_fsblk_t blk);
3225 extern void ext4_free_group_clusters_set(struct super_block *sb,
3226 					 struct ext4_group_desc *bg,
3227 					 __u32 count);
3228 extern void ext4_free_inodes_set(struct super_block *sb,
3229 				struct ext4_group_desc *bg, __u32 count);
3230 extern void ext4_used_dirs_set(struct super_block *sb,
3231 				struct ext4_group_desc *bg, __u32 count);
3232 extern void ext4_itable_unused_set(struct super_block *sb,
3233 				   struct ext4_group_desc *bg, __u32 count);
3234 extern int ext4_group_desc_csum_verify(struct super_block *sb, __u32 group,
3235 				       struct ext4_group_desc *gdp);
3236 extern void ext4_group_desc_csum_set(struct super_block *sb, __u32 group,
3237 				     struct ext4_group_desc *gdp);
3238 extern int ext4_register_li_request(struct super_block *sb,
3239 				    ext4_group_t first_not_zeroed);
3240 
ext4_has_metadata_csum(struct super_block * sb)3241 static inline int ext4_has_metadata_csum(struct super_block *sb)
3242 {
3243 	WARN_ON_ONCE(ext4_has_feature_metadata_csum(sb) &&
3244 		     !EXT4_SB(sb)->s_chksum_driver);
3245 
3246 	return ext4_has_feature_metadata_csum(sb) &&
3247 	       (EXT4_SB(sb)->s_chksum_driver != NULL);
3248 }
3249 
ext4_has_group_desc_csum(struct super_block * sb)3250 static inline int ext4_has_group_desc_csum(struct super_block *sb)
3251 {
3252 	return ext4_has_feature_gdt_csum(sb) || ext4_has_metadata_csum(sb);
3253 }
3254 
3255 #define ext4_read_incompat_64bit_val(es, name) \
3256 	(((es)->s_feature_incompat & cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT) \
3257 		? (ext4_fsblk_t)le32_to_cpu(es->name##_hi) << 32 : 0) | \
3258 		le32_to_cpu(es->name##_lo))
3259 
ext4_blocks_count(struct ext4_super_block * es)3260 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
3261 {
3262 	return ext4_read_incompat_64bit_val(es, s_blocks_count);
3263 }
3264 
ext4_r_blocks_count(struct ext4_super_block * es)3265 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
3266 {
3267 	return ext4_read_incompat_64bit_val(es, s_r_blocks_count);
3268 }
3269 
ext4_free_blocks_count(struct ext4_super_block * es)3270 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
3271 {
3272 	return ext4_read_incompat_64bit_val(es, s_free_blocks_count);
3273 }
3274 
ext4_blocks_count_set(struct ext4_super_block * es,ext4_fsblk_t blk)3275 static inline void ext4_blocks_count_set(struct ext4_super_block *es,
3276 					 ext4_fsblk_t blk)
3277 {
3278 	es->s_blocks_count_lo = cpu_to_le32((u32)blk);
3279 	es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
3280 }
3281 
ext4_free_blocks_count_set(struct ext4_super_block * es,ext4_fsblk_t blk)3282 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
3283 					      ext4_fsblk_t blk)
3284 {
3285 	es->s_free_blocks_count_lo = cpu_to_le32((u32)blk);
3286 	es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
3287 }
3288 
ext4_r_blocks_count_set(struct ext4_super_block * es,ext4_fsblk_t blk)3289 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
3290 					   ext4_fsblk_t blk)
3291 {
3292 	es->s_r_blocks_count_lo = cpu_to_le32((u32)blk);
3293 	es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
3294 }
3295 
ext4_isize(struct super_block * sb,struct ext4_inode * raw_inode)3296 static inline loff_t ext4_isize(struct super_block *sb,
3297 				struct ext4_inode *raw_inode)
3298 {
3299 	if (ext4_has_feature_largedir(sb) ||
3300 	    S_ISREG(le16_to_cpu(raw_inode->i_mode)))
3301 		return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) |
3302 			le32_to_cpu(raw_inode->i_size_lo);
3303 
3304 	return (loff_t) le32_to_cpu(raw_inode->i_size_lo);
3305 }
3306 
ext4_isize_set(struct ext4_inode * raw_inode,loff_t i_size)3307 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size)
3308 {
3309 	raw_inode->i_size_lo = cpu_to_le32(i_size);
3310 	raw_inode->i_size_high = cpu_to_le32(i_size >> 32);
3311 }
3312 
3313 static inline
ext4_get_group_info(struct super_block * sb,ext4_group_t group)3314 struct ext4_group_info *ext4_get_group_info(struct super_block *sb,
3315 					    ext4_group_t group)
3316 {
3317 	 struct ext4_group_info **grp_info;
3318 	 long indexv, indexh;
3319 	 BUG_ON(group >= EXT4_SB(sb)->s_groups_count);
3320 	 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb));
3321 	 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1);
3322 	 grp_info = sbi_array_rcu_deref(EXT4_SB(sb), s_group_info, indexv);
3323 	 return grp_info[indexh];
3324 }
3325 
3326 /*
3327  * Reading s_groups_count requires using smp_rmb() afterwards.  See
3328  * the locking protocol documented in the comments of ext4_group_add()
3329  * in resize.c
3330  */
ext4_get_groups_count(struct super_block * sb)3331 static inline ext4_group_t ext4_get_groups_count(struct super_block *sb)
3332 {
3333 	ext4_group_t	ngroups = EXT4_SB(sb)->s_groups_count;
3334 
3335 	smp_rmb();
3336 	return ngroups;
3337 }
3338 
ext4_flex_group(struct ext4_sb_info * sbi,ext4_group_t block_group)3339 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi,
3340 					     ext4_group_t block_group)
3341 {
3342 	return block_group >> sbi->s_log_groups_per_flex;
3343 }
3344 
ext4_flex_bg_size(struct ext4_sb_info * sbi)3345 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi)
3346 {
3347 	return 1 << sbi->s_log_groups_per_flex;
3348 }
3349 
3350 #define ext4_std_error(sb, errno)				\
3351 do {								\
3352 	if ((errno))						\
3353 		__ext4_std_error((sb), __func__, __LINE__, (errno));	\
3354 } while (0)
3355 
3356 #ifdef CONFIG_SMP
3357 /* Each CPU can accumulate percpu_counter_batch clusters in their local
3358  * counters. So we need to make sure we have free clusters more
3359  * than percpu_counter_batch  * nr_cpu_ids. Also add a window of 4 times.
3360  */
3361 #define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids))
3362 #else
3363 #define EXT4_FREECLUSTERS_WATERMARK 0
3364 #endif
3365 
3366 /* Update i_disksize. Requires i_rwsem to avoid races with truncate */
ext4_update_i_disksize(struct inode * inode,loff_t newsize)3367 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize)
3368 {
3369 	WARN_ON_ONCE(S_ISREG(inode->i_mode) &&
3370 		     !inode_is_locked(inode));
3371 	down_write(&EXT4_I(inode)->i_data_sem);
3372 	if (newsize > EXT4_I(inode)->i_disksize)
3373 		WRITE_ONCE(EXT4_I(inode)->i_disksize, newsize);
3374 	up_write(&EXT4_I(inode)->i_data_sem);
3375 }
3376 
3377 /* Update i_size, i_disksize. Requires i_rwsem to avoid races with truncate */
ext4_update_inode_size(struct inode * inode,loff_t newsize)3378 static inline int ext4_update_inode_size(struct inode *inode, loff_t newsize)
3379 {
3380 	int changed = 0;
3381 
3382 	if (newsize > inode->i_size) {
3383 		i_size_write(inode, newsize);
3384 		changed = 1;
3385 	}
3386 	if (newsize > EXT4_I(inode)->i_disksize) {
3387 		ext4_update_i_disksize(inode, newsize);
3388 		changed |= 2;
3389 	}
3390 	return changed;
3391 }
3392 
3393 int ext4_update_disksize_before_punch(struct inode *inode, loff_t offset,
3394 				      loff_t len);
3395 
3396 struct ext4_group_info {
3397 	unsigned long   bb_state;
3398 #ifdef AGGRESSIVE_CHECK
3399 	unsigned long	bb_check_counter;
3400 #endif
3401 	struct rb_root  bb_free_root;
3402 	ext4_grpblk_t	bb_first_free;	/* first free block */
3403 	ext4_grpblk_t	bb_free;	/* total free blocks */
3404 	ext4_grpblk_t	bb_fragments;	/* nr of freespace fragments */
3405 	ext4_grpblk_t	bb_largest_free_order;/* order of largest frag in BG */
3406 	ext4_group_t	bb_group;	/* Group number */
3407 	struct          list_head bb_prealloc_list;
3408 #ifdef DOUBLE_CHECK
3409 	void            *bb_bitmap;
3410 #endif
3411 	struct rw_semaphore alloc_sem;
3412 	struct rb_node	bb_avg_fragment_size_rb;
3413 	struct list_head bb_largest_free_order_node;
3414 	ext4_grpblk_t	bb_counters[];	/* Nr of free power-of-two-block
3415 					 * regions, index is order.
3416 					 * bb_counters[3] = 5 means
3417 					 * 5 free 8-block regions. */
3418 };
3419 
3420 #define EXT4_GROUP_INFO_NEED_INIT_BIT		0
3421 #define EXT4_GROUP_INFO_WAS_TRIMMED_BIT		1
3422 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT	2
3423 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT	3
3424 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT		\
3425 	(1 << EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT)
3426 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT		\
3427 	(1 << EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT)
3428 #define EXT4_GROUP_INFO_BBITMAP_READ_BIT	4
3429 
3430 #define EXT4_MB_GRP_NEED_INIT(grp)	\
3431 	(test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state)))
3432 #define EXT4_MB_GRP_BBITMAP_CORRUPT(grp)	\
3433 	(test_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &((grp)->bb_state)))
3434 #define EXT4_MB_GRP_IBITMAP_CORRUPT(grp)	\
3435 	(test_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &((grp)->bb_state)))
3436 
3437 #define EXT4_MB_GRP_WAS_TRIMMED(grp)	\
3438 	(test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
3439 #define EXT4_MB_GRP_SET_TRIMMED(grp)	\
3440 	(set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
3441 #define EXT4_MB_GRP_CLEAR_TRIMMED(grp)	\
3442 	(clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
3443 #define EXT4_MB_GRP_TEST_AND_SET_READ(grp)	\
3444 	(test_and_set_bit(EXT4_GROUP_INFO_BBITMAP_READ_BIT, &((grp)->bb_state)))
3445 
3446 #define EXT4_MAX_CONTENTION		8
3447 #define EXT4_CONTENTION_THRESHOLD	2
3448 
ext4_group_lock_ptr(struct super_block * sb,ext4_group_t group)3449 static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb,
3450 					      ext4_group_t group)
3451 {
3452 	return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group);
3453 }
3454 
3455 /*
3456  * Returns true if the filesystem is busy enough that attempts to
3457  * access the block group locks has run into contention.
3458  */
ext4_fs_is_busy(struct ext4_sb_info * sbi)3459 static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi)
3460 {
3461 	return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD);
3462 }
3463 
ext4_lock_group(struct super_block * sb,ext4_group_t group)3464 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group)
3465 {
3466 	spinlock_t *lock = ext4_group_lock_ptr(sb, group);
3467 	if (spin_trylock(lock))
3468 		/*
3469 		 * We're able to grab the lock right away, so drop the
3470 		 * lock contention counter.
3471 		 */
3472 		atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0);
3473 	else {
3474 		/*
3475 		 * The lock is busy, so bump the contention counter,
3476 		 * and then wait on the spin lock.
3477 		 */
3478 		atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1,
3479 				  EXT4_MAX_CONTENTION);
3480 		spin_lock(lock);
3481 	}
3482 }
3483 
ext4_unlock_group(struct super_block * sb,ext4_group_t group)3484 static inline void ext4_unlock_group(struct super_block *sb,
3485 					ext4_group_t group)
3486 {
3487 	spin_unlock(ext4_group_lock_ptr(sb, group));
3488 }
3489 
3490 #ifdef CONFIG_QUOTA
ext4_quota_capable(struct super_block * sb)3491 static inline bool ext4_quota_capable(struct super_block *sb)
3492 {
3493 	return (test_opt(sb, QUOTA) || ext4_has_feature_quota(sb));
3494 }
3495 
ext4_is_quota_journalled(struct super_block * sb)3496 static inline bool ext4_is_quota_journalled(struct super_block *sb)
3497 {
3498 	struct ext4_sb_info *sbi = EXT4_SB(sb);
3499 
3500 	return (ext4_has_feature_quota(sb) ||
3501 		sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]);
3502 }
3503 int ext4_enable_quotas(struct super_block *sb);
3504 #endif
3505 
3506 /*
3507  * Block validity checking
3508  */
3509 #define ext4_check_indirect_blockref(inode, bh)				\
3510 	ext4_check_blockref(__func__, __LINE__, inode,			\
3511 			    (__le32 *)(bh)->b_data,			\
3512 			    EXT4_ADDR_PER_BLOCK((inode)->i_sb))
3513 
3514 #define ext4_ind_check_inode(inode)					\
3515 	ext4_check_blockref(__func__, __LINE__, inode,			\
3516 			    EXT4_I(inode)->i_data,			\
3517 			    EXT4_NDIR_BLOCKS)
3518 
3519 /*
3520  * Inodes and files operations
3521  */
3522 
3523 /* dir.c */
3524 extern const struct file_operations ext4_dir_operations;
3525 
3526 /* file.c */
3527 extern const struct inode_operations ext4_file_inode_operations;
3528 extern const struct file_operations ext4_file_operations;
3529 extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin);
3530 
3531 /* inline.c */
3532 extern int ext4_get_max_inline_size(struct inode *inode);
3533 extern int ext4_find_inline_data_nolock(struct inode *inode);
3534 extern int ext4_init_inline_data(handle_t *handle, struct inode *inode,
3535 				 unsigned int len);
3536 extern int ext4_destroy_inline_data(handle_t *handle, struct inode *inode);
3537 
3538 extern int ext4_readpage_inline(struct inode *inode, struct page *page);
3539 extern int ext4_try_to_write_inline_data(struct address_space *mapping,
3540 					 struct inode *inode,
3541 					 loff_t pos, unsigned len,
3542 					 struct page **pagep);
3543 extern int ext4_write_inline_data_end(struct inode *inode,
3544 				      loff_t pos, unsigned len,
3545 				      unsigned copied,
3546 				      struct page *page);
3547 extern struct buffer_head *
3548 ext4_journalled_write_inline_data(struct inode *inode,
3549 				  unsigned len,
3550 				  struct page *page);
3551 extern int ext4_da_write_inline_data_begin(struct address_space *mapping,
3552 					   struct inode *inode,
3553 					   loff_t pos, unsigned len,
3554 					   struct page **pagep,
3555 					   void **fsdata);
3556 extern int ext4_try_add_inline_entry(handle_t *handle,
3557 				     struct ext4_filename *fname,
3558 				     struct inode *dir, struct inode *inode);
3559 extern int ext4_try_create_inline_dir(handle_t *handle,
3560 				      struct inode *parent,
3561 				      struct inode *inode);
3562 extern int ext4_read_inline_dir(struct file *filp,
3563 				struct dir_context *ctx,
3564 				int *has_inline_data);
3565 extern int ext4_inlinedir_to_tree(struct file *dir_file,
3566 				  struct inode *dir, ext4_lblk_t block,
3567 				  struct dx_hash_info *hinfo,
3568 				  __u32 start_hash, __u32 start_minor_hash,
3569 				  int *has_inline_data);
3570 extern struct buffer_head *ext4_find_inline_entry(struct inode *dir,
3571 					struct ext4_filename *fname,
3572 					struct ext4_dir_entry_2 **res_dir,
3573 					int *has_inline_data);
3574 extern int ext4_delete_inline_entry(handle_t *handle,
3575 				    struct inode *dir,
3576 				    struct ext4_dir_entry_2 *de_del,
3577 				    struct buffer_head *bh,
3578 				    int *has_inline_data);
3579 extern bool empty_inline_dir(struct inode *dir, int *has_inline_data);
3580 extern struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
3581 					struct ext4_dir_entry_2 **parent_de,
3582 					int *retval);
3583 extern int ext4_inline_data_fiemap(struct inode *inode,
3584 				   struct fiemap_extent_info *fieinfo,
3585 				   int *has_inline, __u64 start, __u64 len);
3586 extern void *ext4_read_inline_link(struct inode *inode);
3587 
3588 struct iomap;
3589 extern int ext4_inline_data_iomap(struct inode *inode, struct iomap *iomap);
3590 
3591 extern int ext4_inline_data_truncate(struct inode *inode, int *has_inline);
3592 
3593 extern int ext4_convert_inline_data(struct inode *inode);
3594 
ext4_has_inline_data(struct inode * inode)3595 static inline int ext4_has_inline_data(struct inode *inode)
3596 {
3597 	return ext4_test_inode_flag(inode, EXT4_INODE_INLINE_DATA) &&
3598 	       EXT4_I(inode)->i_inline_off;
3599 }
3600 
3601 /* namei.c */
3602 extern const struct inode_operations ext4_dir_inode_operations;
3603 extern const struct inode_operations ext4_special_inode_operations;
3604 extern struct dentry *ext4_get_parent(struct dentry *child);
3605 extern struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode,
3606 				 struct ext4_dir_entry_2 *de,
3607 				 int blocksize, int csum_size,
3608 				 unsigned int parent_ino, int dotdot_real_len);
3609 extern void ext4_initialize_dirent_tail(struct buffer_head *bh,
3610 					unsigned int blocksize);
3611 extern int ext4_handle_dirty_dirblock(handle_t *handle, struct inode *inode,
3612 				      struct buffer_head *bh);
3613 extern int __ext4_unlink(handle_t *handle, struct inode *dir, const struct qstr *d_name,
3614 			 struct inode *inode);
3615 extern int __ext4_link(struct inode *dir, struct inode *inode,
3616 		       struct dentry *dentry);
3617 
3618 #define S_SHIFT 12
3619 static const unsigned char ext4_type_by_mode[(S_IFMT >> S_SHIFT) + 1] = {
3620 	[S_IFREG >> S_SHIFT]	= EXT4_FT_REG_FILE,
3621 	[S_IFDIR >> S_SHIFT]	= EXT4_FT_DIR,
3622 	[S_IFCHR >> S_SHIFT]	= EXT4_FT_CHRDEV,
3623 	[S_IFBLK >> S_SHIFT]	= EXT4_FT_BLKDEV,
3624 	[S_IFIFO >> S_SHIFT]	= EXT4_FT_FIFO,
3625 	[S_IFSOCK >> S_SHIFT]	= EXT4_FT_SOCK,
3626 	[S_IFLNK >> S_SHIFT]	= EXT4_FT_SYMLINK,
3627 };
3628 
ext4_set_de_type(struct super_block * sb,struct ext4_dir_entry_2 * de,umode_t mode)3629 static inline void ext4_set_de_type(struct super_block *sb,
3630 				struct ext4_dir_entry_2 *de,
3631 				umode_t mode) {
3632 	if (ext4_has_feature_filetype(sb))
3633 		de->file_type = ext4_type_by_mode[(mode & S_IFMT)>>S_SHIFT];
3634 }
3635 
3636 /* readpages.c */
3637 extern int ext4_mpage_readpages(struct inode *inode,
3638 		struct readahead_control *rac, struct page *page);
3639 extern int __init ext4_init_post_read_processing(void);
3640 extern void ext4_exit_post_read_processing(void);
3641 
3642 /* symlink.c */
3643 extern const struct inode_operations ext4_encrypted_symlink_inode_operations;
3644 extern const struct inode_operations ext4_symlink_inode_operations;
3645 extern const struct inode_operations ext4_fast_symlink_inode_operations;
3646 
3647 /* sysfs.c */
3648 extern void ext4_notify_error_sysfs(struct ext4_sb_info *sbi);
3649 extern int ext4_register_sysfs(struct super_block *sb);
3650 extern void ext4_unregister_sysfs(struct super_block *sb);
3651 extern int __init ext4_init_sysfs(void);
3652 extern void ext4_exit_sysfs(void);
3653 
3654 /* block_validity */
3655 extern void ext4_release_system_zone(struct super_block *sb);
3656 extern int ext4_setup_system_zone(struct super_block *sb);
3657 extern int __init ext4_init_system_zone(void);
3658 extern void ext4_exit_system_zone(void);
3659 extern int ext4_inode_block_valid(struct inode *inode,
3660 				  ext4_fsblk_t start_blk,
3661 				  unsigned int count);
3662 extern int ext4_check_blockref(const char *, unsigned int,
3663 			       struct inode *, __le32 *, unsigned int);
3664 extern int ext4_sb_block_valid(struct super_block *sb, struct inode *inode,
3665 				ext4_fsblk_t start_blk, unsigned int count);
3666 
3667 
3668 /* extents.c */
3669 struct ext4_ext_path;
3670 struct ext4_extent;
3671 
3672 /*
3673  * Maximum number of logical blocks in a file; ext4_extent's ee_block is
3674  * __le32.
3675  */
3676 #define EXT_MAX_BLOCKS	0xffffffff
3677 
3678 extern void ext4_ext_tree_init(handle_t *handle, struct inode *inode);
3679 extern int ext4_ext_index_trans_blocks(struct inode *inode, int extents);
3680 extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
3681 			       struct ext4_map_blocks *map, int flags);
3682 extern int ext4_ext_truncate(handle_t *, struct inode *);
3683 extern int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start,
3684 				 ext4_lblk_t end);
3685 extern void ext4_ext_init(struct super_block *);
3686 extern void ext4_ext_release(struct super_block *);
3687 extern long ext4_fallocate(struct file *file, int mode, loff_t offset,
3688 			  loff_t len);
3689 extern int ext4_convert_unwritten_extents(handle_t *handle, struct inode *inode,
3690 					  loff_t offset, ssize_t len);
3691 extern int ext4_convert_unwritten_io_end_vec(handle_t *handle,
3692 					     ext4_io_end_t *io_end);
3693 extern int ext4_map_blocks(handle_t *handle, struct inode *inode,
3694 			   struct ext4_map_blocks *map, int flags);
3695 extern int ext4_ext_calc_credits_for_single_extent(struct inode *inode,
3696 						   int num,
3697 						   struct ext4_ext_path *path);
3698 extern int ext4_ext_insert_extent(handle_t *, struct inode *,
3699 				  struct ext4_ext_path **,
3700 				  struct ext4_extent *, int);
3701 extern struct ext4_ext_path *ext4_find_extent(struct inode *, ext4_lblk_t,
3702 					      struct ext4_ext_path **,
3703 					      int flags);
3704 extern void ext4_ext_drop_refs(struct ext4_ext_path *);
3705 extern int ext4_ext_check_inode(struct inode *inode);
3706 extern ext4_lblk_t ext4_ext_next_allocated_block(struct ext4_ext_path *path);
3707 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
3708 			__u64 start, __u64 len);
3709 extern int ext4_get_es_cache(struct inode *inode,
3710 			     struct fiemap_extent_info *fieinfo,
3711 			     __u64 start, __u64 len);
3712 extern int ext4_ext_precache(struct inode *inode);
3713 extern int ext4_swap_extents(handle_t *handle, struct inode *inode1,
3714 				struct inode *inode2, ext4_lblk_t lblk1,
3715 			     ext4_lblk_t lblk2,  ext4_lblk_t count,
3716 			     int mark_unwritten,int *err);
3717 extern int ext4_clu_mapped(struct inode *inode, ext4_lblk_t lclu);
3718 extern int ext4_datasem_ensure_credits(handle_t *handle, struct inode *inode,
3719 				       int check_cred, int restart_cred,
3720 				       int revoke_cred);
3721 extern void ext4_ext_replay_shrink_inode(struct inode *inode, ext4_lblk_t end);
3722 extern int ext4_ext_replay_set_iblocks(struct inode *inode);
3723 extern int ext4_ext_replay_update_ex(struct inode *inode, ext4_lblk_t start,
3724 		int len, int unwritten, ext4_fsblk_t pblk);
3725 extern int ext4_ext_clear_bb(struct inode *inode);
3726 
3727 
3728 /* move_extent.c */
3729 extern void ext4_double_down_write_data_sem(struct inode *first,
3730 					    struct inode *second);
3731 extern void ext4_double_up_write_data_sem(struct inode *orig_inode,
3732 					  struct inode *donor_inode);
3733 extern int ext4_move_extents(struct file *o_filp, struct file *d_filp,
3734 			     __u64 start_orig, __u64 start_donor,
3735 			     __u64 len, __u64 *moved_len);
3736 
3737 /* page-io.c */
3738 extern int __init ext4_init_pageio(void);
3739 extern void ext4_exit_pageio(void);
3740 extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags);
3741 extern ext4_io_end_t *ext4_get_io_end(ext4_io_end_t *io_end);
3742 extern int ext4_put_io_end(ext4_io_end_t *io_end);
3743 extern void ext4_put_io_end_defer(ext4_io_end_t *io_end);
3744 extern void ext4_io_submit_init(struct ext4_io_submit *io,
3745 				struct writeback_control *wbc);
3746 extern void ext4_end_io_rsv_work(struct work_struct *work);
3747 extern void ext4_io_submit(struct ext4_io_submit *io);
3748 extern int ext4_bio_write_page(struct ext4_io_submit *io,
3749 			       struct page *page,
3750 			       int len,
3751 			       bool keep_towrite);
3752 extern struct ext4_io_end_vec *ext4_alloc_io_end_vec(ext4_io_end_t *io_end);
3753 extern struct ext4_io_end_vec *ext4_last_io_end_vec(ext4_io_end_t *io_end);
3754 
3755 /* mmp.c */
3756 extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t);
3757 
3758 /* mmp.c */
3759 extern void ext4_stop_mmpd(struct ext4_sb_info *sbi);
3760 
3761 /* verity.c */
3762 extern const struct fsverity_operations ext4_verityops;
3763 
3764 /* orphan.c */
3765 extern int ext4_orphan_add(handle_t *, struct inode *);
3766 extern int ext4_orphan_del(handle_t *, struct inode *);
3767 extern void ext4_orphan_cleanup(struct super_block *sb,
3768 				struct ext4_super_block *es);
3769 extern void ext4_release_orphan_info(struct super_block *sb);
3770 extern int ext4_init_orphan_info(struct super_block *sb);
3771 extern int ext4_orphan_file_empty(struct super_block *sb);
3772 extern void ext4_orphan_file_block_trigger(
3773 				struct jbd2_buffer_trigger_type *triggers,
3774 				struct buffer_head *bh,
3775 				void *data, size_t size);
3776 
3777 /*
3778  * Add new method to test whether block and inode bitmaps are properly
3779  * initialized. With uninit_bg reading the block from disk is not enough
3780  * to mark the bitmap uptodate. We need to also zero-out the bitmap
3781  */
3782 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart
3783 
bitmap_uptodate(struct buffer_head * bh)3784 static inline int bitmap_uptodate(struct buffer_head *bh)
3785 {
3786 	return (buffer_uptodate(bh) &&
3787 			test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state));
3788 }
set_bitmap_uptodate(struct buffer_head * bh)3789 static inline void set_bitmap_uptodate(struct buffer_head *bh)
3790 {
3791 	set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state);
3792 }
3793 
3794 #define in_range(b, first, len)	((b) >= (first) && (b) <= (first) + (len) - 1)
3795 
3796 /* For ioend & aio unwritten conversion wait queues */
3797 #define EXT4_WQ_HASH_SZ		37
3798 #define ext4_ioend_wq(v)   (&ext4__ioend_wq[((unsigned long)(v)) %\
3799 					    EXT4_WQ_HASH_SZ])
3800 extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
3801 
3802 extern int ext4_resize_begin(struct super_block *sb);
3803 extern void ext4_resize_end(struct super_block *sb);
3804 
ext4_set_io_unwritten_flag(struct inode * inode,struct ext4_io_end * io_end)3805 static inline void ext4_set_io_unwritten_flag(struct inode *inode,
3806 					      struct ext4_io_end *io_end)
3807 {
3808 	if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) {
3809 		io_end->flag |= EXT4_IO_END_UNWRITTEN;
3810 		atomic_inc(&EXT4_I(inode)->i_unwritten);
3811 	}
3812 }
3813 
ext4_clear_io_unwritten_flag(ext4_io_end_t * io_end)3814 static inline void ext4_clear_io_unwritten_flag(ext4_io_end_t *io_end)
3815 {
3816 	struct inode *inode = io_end->inode;
3817 
3818 	if (io_end->flag & EXT4_IO_END_UNWRITTEN) {
3819 		io_end->flag &= ~EXT4_IO_END_UNWRITTEN;
3820 		/* Wake up anyone waiting on unwritten extent conversion */
3821 		if (atomic_dec_and_test(&EXT4_I(inode)->i_unwritten))
3822 			wake_up_all(ext4_ioend_wq(inode));
3823 	}
3824 }
3825 
3826 extern const struct iomap_ops ext4_iomap_ops;
3827 extern const struct iomap_ops ext4_iomap_overwrite_ops;
3828 extern const struct iomap_ops ext4_iomap_report_ops;
3829 
ext4_buffer_uptodate(struct buffer_head * bh)3830 static inline int ext4_buffer_uptodate(struct buffer_head *bh)
3831 {
3832 	/*
3833 	 * If the buffer has the write error flag, we have failed
3834 	 * to write out data in the block.  In this  case, we don't
3835 	 * have to read the block because we may read the old data
3836 	 * successfully.
3837 	 */
3838 	if (buffer_write_io_error(bh))
3839 		set_buffer_uptodate(bh);
3840 	return buffer_uptodate(bh);
3841 }
3842 
3843 #endif	/* __KERNEL__ */
3844 
3845 #define EFSBADCRC	EBADMSG		/* Bad CRC detected */
3846 #define EFSCORRUPTED	EUCLEAN		/* Filesystem is corrupted */
3847 
3848 #endif	/* _EXT4_H */
3849