xref: /openbmc/linux/fs/ext4/ext4.h (revision 53085fac)
1 /*
2  *  ext4.h
3  *
4  * Copyright (C) 1992, 1993, 1994, 1995
5  * Remy Card (card@masi.ibp.fr)
6  * Laboratoire MASI - Institut Blaise Pascal
7  * Universite Pierre et Marie Curie (Paris VI)
8  *
9  *  from
10  *
11  *  linux/include/linux/minix_fs.h
12  *
13  *  Copyright (C) 1991, 1992  Linus Torvalds
14  */
15 
16 #ifndef _EXT4_H
17 #define _EXT4_H
18 
19 #include <linux/types.h>
20 #include <linux/blkdev.h>
21 #include <linux/magic.h>
22 #include <linux/jbd2.h>
23 #include <linux/quota.h>
24 #include <linux/rwsem.h>
25 #include <linux/rbtree.h>
26 #include <linux/seqlock.h>
27 #include <linux/mutex.h>
28 #include <linux/timer.h>
29 #include <linux/version.h>
30 #include <linux/wait.h>
31 #include <linux/blockgroup_lock.h>
32 #include <linux/percpu_counter.h>
33 #include <linux/ratelimit.h>
34 #include <crypto/hash.h>
35 #include <linux/falloc.h>
36 #ifdef __KERNEL__
37 #include <linux/compat.h>
38 #endif
39 
40 /*
41  * The fourth extended filesystem constants/structures
42  */
43 
44 /*
45  * Define EXT4FS_DEBUG to produce debug messages
46  */
47 #undef EXT4FS_DEBUG
48 
49 /*
50  * Debug code
51  */
52 #ifdef EXT4FS_DEBUG
53 #define ext4_debug(f, a...)						\
54 	do {								\
55 		printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:",	\
56 			__FILE__, __LINE__, __func__);			\
57 		printk(KERN_DEBUG f, ## a);				\
58 	} while (0)
59 #else
60 #define ext4_debug(fmt, ...)	no_printk(fmt, ##__VA_ARGS__)
61 #endif
62 
63 /*
64  * Turn on EXT_DEBUG to get lots of info about extents operations.
65  */
66 #define EXT_DEBUG__
67 #ifdef EXT_DEBUG
68 #define ext_debug(fmt, ...)	printk(fmt, ##__VA_ARGS__)
69 #else
70 #define ext_debug(fmt, ...)	no_printk(fmt, ##__VA_ARGS__)
71 #endif
72 
73 /* data type for block offset of block group */
74 typedef int ext4_grpblk_t;
75 
76 /* data type for filesystem-wide blocks number */
77 typedef unsigned long long ext4_fsblk_t;
78 
79 /* data type for file logical block number */
80 typedef __u32 ext4_lblk_t;
81 
82 /* data type for block group number */
83 typedef unsigned int ext4_group_t;
84 
85 enum SHIFT_DIRECTION {
86 	SHIFT_LEFT = 0,
87 	SHIFT_RIGHT,
88 };
89 
90 /*
91  * Flags used in mballoc's allocation_context flags field.
92  *
93  * Also used to show what's going on for debugging purposes when the
94  * flag field is exported via the traceport interface
95  */
96 
97 /* prefer goal again. length */
98 #define EXT4_MB_HINT_MERGE		0x0001
99 /* blocks already reserved */
100 #define EXT4_MB_HINT_RESERVED		0x0002
101 /* metadata is being allocated */
102 #define EXT4_MB_HINT_METADATA		0x0004
103 /* first blocks in the file */
104 #define EXT4_MB_HINT_FIRST		0x0008
105 /* search for the best chunk */
106 #define EXT4_MB_HINT_BEST		0x0010
107 /* data is being allocated */
108 #define EXT4_MB_HINT_DATA		0x0020
109 /* don't preallocate (for tails) */
110 #define EXT4_MB_HINT_NOPREALLOC		0x0040
111 /* allocate for locality group */
112 #define EXT4_MB_HINT_GROUP_ALLOC	0x0080
113 /* allocate goal blocks or none */
114 #define EXT4_MB_HINT_GOAL_ONLY		0x0100
115 /* goal is meaningful */
116 #define EXT4_MB_HINT_TRY_GOAL		0x0200
117 /* blocks already pre-reserved by delayed allocation */
118 #define EXT4_MB_DELALLOC_RESERVED	0x0400
119 /* We are doing stream allocation */
120 #define EXT4_MB_STREAM_ALLOC		0x0800
121 /* Use reserved root blocks if needed */
122 #define EXT4_MB_USE_ROOT_BLOCKS		0x1000
123 /* Use blocks from reserved pool */
124 #define EXT4_MB_USE_RESERVED		0x2000
125 
126 struct ext4_allocation_request {
127 	/* target inode for block we're allocating */
128 	struct inode *inode;
129 	/* how many blocks we want to allocate */
130 	unsigned int len;
131 	/* logical block in target inode */
132 	ext4_lblk_t logical;
133 	/* the closest logical allocated block to the left */
134 	ext4_lblk_t lleft;
135 	/* the closest logical allocated block to the right */
136 	ext4_lblk_t lright;
137 	/* phys. target (a hint) */
138 	ext4_fsblk_t goal;
139 	/* phys. block for the closest logical allocated block to the left */
140 	ext4_fsblk_t pleft;
141 	/* phys. block for the closest logical allocated block to the right */
142 	ext4_fsblk_t pright;
143 	/* flags. see above EXT4_MB_HINT_* */
144 	unsigned int flags;
145 };
146 
147 /*
148  * Logical to physical block mapping, used by ext4_map_blocks()
149  *
150  * This structure is used to pass requests into ext4_map_blocks() as
151  * well as to store the information returned by ext4_map_blocks().  It
152  * takes less room on the stack than a struct buffer_head.
153  */
154 #define EXT4_MAP_NEW		(1 << BH_New)
155 #define EXT4_MAP_MAPPED		(1 << BH_Mapped)
156 #define EXT4_MAP_UNWRITTEN	(1 << BH_Unwritten)
157 #define EXT4_MAP_BOUNDARY	(1 << BH_Boundary)
158 #define EXT4_MAP_FLAGS		(EXT4_MAP_NEW | EXT4_MAP_MAPPED |\
159 				 EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY)
160 
161 struct ext4_map_blocks {
162 	ext4_fsblk_t m_pblk;
163 	ext4_lblk_t m_lblk;
164 	unsigned int m_len;
165 	unsigned int m_flags;
166 };
167 
168 /*
169  * Flags for ext4_io_end->flags
170  */
171 #define	EXT4_IO_END_UNWRITTEN	0x0001
172 
173 /*
174  * For converting unwritten extents on a work queue. 'handle' is used for
175  * buffered writeback.
176  */
177 typedef struct ext4_io_end {
178 	struct list_head	list;		/* per-file finished IO list */
179 	handle_t		*handle;	/* handle reserved for extent
180 						 * conversion */
181 	struct inode		*inode;		/* file being written to */
182 	struct bio		*bio;		/* Linked list of completed
183 						 * bios covering the extent */
184 	unsigned int		flag;		/* unwritten or not */
185 	loff_t			offset;		/* offset in the file */
186 	ssize_t			size;		/* size of the extent */
187 	atomic_t		count;		/* reference counter */
188 } ext4_io_end_t;
189 
190 struct ext4_io_submit {
191 	struct writeback_control *io_wbc;
192 	struct bio		*io_bio;
193 	ext4_io_end_t		*io_end;
194 	sector_t		io_next_block;
195 };
196 
197 /*
198  * Special inodes numbers
199  */
200 #define	EXT4_BAD_INO		 1	/* Bad blocks inode */
201 #define EXT4_ROOT_INO		 2	/* Root inode */
202 #define EXT4_USR_QUOTA_INO	 3	/* User quota inode */
203 #define EXT4_GRP_QUOTA_INO	 4	/* Group quota inode */
204 #define EXT4_BOOT_LOADER_INO	 5	/* Boot loader inode */
205 #define EXT4_UNDEL_DIR_INO	 6	/* Undelete directory inode */
206 #define EXT4_RESIZE_INO		 7	/* Reserved group descriptors inode */
207 #define EXT4_JOURNAL_INO	 8	/* Journal inode */
208 
209 /* First non-reserved inode for old ext4 filesystems */
210 #define EXT4_GOOD_OLD_FIRST_INO	11
211 
212 /*
213  * Maximal count of links to a file
214  */
215 #define EXT4_LINK_MAX		65000
216 
217 /*
218  * Macro-instructions used to manage several block sizes
219  */
220 #define EXT4_MIN_BLOCK_SIZE		1024
221 #define	EXT4_MAX_BLOCK_SIZE		65536
222 #define EXT4_MIN_BLOCK_LOG_SIZE		10
223 #define EXT4_MAX_BLOCK_LOG_SIZE		16
224 #ifdef __KERNEL__
225 # define EXT4_BLOCK_SIZE(s)		((s)->s_blocksize)
226 #else
227 # define EXT4_BLOCK_SIZE(s)		(EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
228 #endif
229 #define	EXT4_ADDR_PER_BLOCK(s)		(EXT4_BLOCK_SIZE(s) / sizeof(__u32))
230 #define EXT4_CLUSTER_SIZE(s)		(EXT4_BLOCK_SIZE(s) << \
231 					 EXT4_SB(s)->s_cluster_bits)
232 #ifdef __KERNEL__
233 # define EXT4_BLOCK_SIZE_BITS(s)	((s)->s_blocksize_bits)
234 # define EXT4_CLUSTER_BITS(s)		(EXT4_SB(s)->s_cluster_bits)
235 #else
236 # define EXT4_BLOCK_SIZE_BITS(s)	((s)->s_log_block_size + 10)
237 #endif
238 #ifdef __KERNEL__
239 #define	EXT4_ADDR_PER_BLOCK_BITS(s)	(EXT4_SB(s)->s_addr_per_block_bits)
240 #define EXT4_INODE_SIZE(s)		(EXT4_SB(s)->s_inode_size)
241 #define EXT4_FIRST_INO(s)		(EXT4_SB(s)->s_first_ino)
242 #else
243 #define EXT4_INODE_SIZE(s)	(((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
244 				 EXT4_GOOD_OLD_INODE_SIZE : \
245 				 (s)->s_inode_size)
246 #define EXT4_FIRST_INO(s)	(((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
247 				 EXT4_GOOD_OLD_FIRST_INO : \
248 				 (s)->s_first_ino)
249 #endif
250 #define EXT4_BLOCK_ALIGN(size, blkbits)		ALIGN((size), (1 << (blkbits)))
251 
252 /* Translate a block number to a cluster number */
253 #define EXT4_B2C(sbi, blk)	((blk) >> (sbi)->s_cluster_bits)
254 /* Translate a cluster number to a block number */
255 #define EXT4_C2B(sbi, cluster)	((cluster) << (sbi)->s_cluster_bits)
256 /* Translate # of blks to # of clusters */
257 #define EXT4_NUM_B2C(sbi, blks)	(((blks) + (sbi)->s_cluster_ratio - 1) >> \
258 				 (sbi)->s_cluster_bits)
259 /* Mask out the low bits to get the starting block of the cluster */
260 #define EXT4_PBLK_CMASK(s, pblk) ((pblk) &				\
261 				  ~((ext4_fsblk_t) (s)->s_cluster_ratio - 1))
262 #define EXT4_LBLK_CMASK(s, lblk) ((lblk) &				\
263 				  ~((ext4_lblk_t) (s)->s_cluster_ratio - 1))
264 /* Get the cluster offset */
265 #define EXT4_PBLK_COFF(s, pblk) ((pblk) &				\
266 				 ((ext4_fsblk_t) (s)->s_cluster_ratio - 1))
267 #define EXT4_LBLK_COFF(s, lblk) ((lblk) &				\
268 				 ((ext4_lblk_t) (s)->s_cluster_ratio - 1))
269 
270 /*
271  * Structure of a blocks group descriptor
272  */
273 struct ext4_group_desc
274 {
275 	__le32	bg_block_bitmap_lo;	/* Blocks bitmap block */
276 	__le32	bg_inode_bitmap_lo;	/* Inodes bitmap block */
277 	__le32	bg_inode_table_lo;	/* Inodes table block */
278 	__le16	bg_free_blocks_count_lo;/* Free blocks count */
279 	__le16	bg_free_inodes_count_lo;/* Free inodes count */
280 	__le16	bg_used_dirs_count_lo;	/* Directories count */
281 	__le16	bg_flags;		/* EXT4_BG_flags (INODE_UNINIT, etc) */
282 	__le32  bg_exclude_bitmap_lo;   /* Exclude bitmap for snapshots */
283 	__le16  bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bbitmap) LE */
284 	__le16  bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+ibitmap) LE */
285 	__le16  bg_itable_unused_lo;	/* Unused inodes count */
286 	__le16  bg_checksum;		/* crc16(sb_uuid+group+desc) */
287 	__le32	bg_block_bitmap_hi;	/* Blocks bitmap block MSB */
288 	__le32	bg_inode_bitmap_hi;	/* Inodes bitmap block MSB */
289 	__le32	bg_inode_table_hi;	/* Inodes table block MSB */
290 	__le16	bg_free_blocks_count_hi;/* Free blocks count MSB */
291 	__le16	bg_free_inodes_count_hi;/* Free inodes count MSB */
292 	__le16	bg_used_dirs_count_hi;	/* Directories count MSB */
293 	__le16  bg_itable_unused_hi;    /* Unused inodes count MSB */
294 	__le32  bg_exclude_bitmap_hi;   /* Exclude bitmap block MSB */
295 	__le16  bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bbitmap) BE */
296 	__le16  bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+ibitmap) BE */
297 	__u32   bg_reserved;
298 };
299 
300 #define EXT4_BG_INODE_BITMAP_CSUM_HI_END	\
301 	(offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \
302 	 sizeof(__le16))
303 #define EXT4_BG_BLOCK_BITMAP_CSUM_HI_END	\
304 	(offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \
305 	 sizeof(__le16))
306 
307 /*
308  * Structure of a flex block group info
309  */
310 
311 struct flex_groups {
312 	atomic64_t	free_clusters;
313 	atomic_t	free_inodes;
314 	atomic_t	used_dirs;
315 };
316 
317 #define EXT4_BG_INODE_UNINIT	0x0001 /* Inode table/bitmap not in use */
318 #define EXT4_BG_BLOCK_UNINIT	0x0002 /* Block bitmap not in use */
319 #define EXT4_BG_INODE_ZEROED	0x0004 /* On-disk itable initialized to zero */
320 
321 /*
322  * Macro-instructions used to manage group descriptors
323  */
324 #define EXT4_MIN_DESC_SIZE		32
325 #define EXT4_MIN_DESC_SIZE_64BIT	64
326 #define	EXT4_MAX_DESC_SIZE		EXT4_MIN_BLOCK_SIZE
327 #define EXT4_DESC_SIZE(s)		(EXT4_SB(s)->s_desc_size)
328 #ifdef __KERNEL__
329 # define EXT4_BLOCKS_PER_GROUP(s)	(EXT4_SB(s)->s_blocks_per_group)
330 # define EXT4_CLUSTERS_PER_GROUP(s)	(EXT4_SB(s)->s_clusters_per_group)
331 # define EXT4_DESC_PER_BLOCK(s)		(EXT4_SB(s)->s_desc_per_block)
332 # define EXT4_INODES_PER_GROUP(s)	(EXT4_SB(s)->s_inodes_per_group)
333 # define EXT4_DESC_PER_BLOCK_BITS(s)	(EXT4_SB(s)->s_desc_per_block_bits)
334 #else
335 # define EXT4_BLOCKS_PER_GROUP(s)	((s)->s_blocks_per_group)
336 # define EXT4_DESC_PER_BLOCK(s)		(EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
337 # define EXT4_INODES_PER_GROUP(s)	((s)->s_inodes_per_group)
338 #endif
339 
340 /*
341  * Constants relative to the data blocks
342  */
343 #define	EXT4_NDIR_BLOCKS		12
344 #define	EXT4_IND_BLOCK			EXT4_NDIR_BLOCKS
345 #define	EXT4_DIND_BLOCK			(EXT4_IND_BLOCK + 1)
346 #define	EXT4_TIND_BLOCK			(EXT4_DIND_BLOCK + 1)
347 #define	EXT4_N_BLOCKS			(EXT4_TIND_BLOCK + 1)
348 
349 /*
350  * Inode flags
351  */
352 #define	EXT4_SECRM_FL			0x00000001 /* Secure deletion */
353 #define	EXT4_UNRM_FL			0x00000002 /* Undelete */
354 #define	EXT4_COMPR_FL			0x00000004 /* Compress file */
355 #define EXT4_SYNC_FL			0x00000008 /* Synchronous updates */
356 #define EXT4_IMMUTABLE_FL		0x00000010 /* Immutable file */
357 #define EXT4_APPEND_FL			0x00000020 /* writes to file may only append */
358 #define EXT4_NODUMP_FL			0x00000040 /* do not dump file */
359 #define EXT4_NOATIME_FL			0x00000080 /* do not update atime */
360 /* Reserved for compression usage... */
361 #define EXT4_DIRTY_FL			0x00000100
362 #define EXT4_COMPRBLK_FL		0x00000200 /* One or more compressed clusters */
363 #define EXT4_NOCOMPR_FL			0x00000400 /* Don't compress */
364 	/* nb: was previously EXT2_ECOMPR_FL */
365 #define EXT4_ENCRYPT_FL			0x00000800 /* encrypted file */
366 /* End compression flags --- maybe not all used */
367 #define EXT4_INDEX_FL			0x00001000 /* hash-indexed directory */
368 #define EXT4_IMAGIC_FL			0x00002000 /* AFS directory */
369 #define EXT4_JOURNAL_DATA_FL		0x00004000 /* file data should be journaled */
370 #define EXT4_NOTAIL_FL			0x00008000 /* file tail should not be merged */
371 #define EXT4_DIRSYNC_FL			0x00010000 /* dirsync behaviour (directories only) */
372 #define EXT4_TOPDIR_FL			0x00020000 /* Top of directory hierarchies*/
373 #define EXT4_HUGE_FILE_FL               0x00040000 /* Set to each huge file */
374 #define EXT4_EXTENTS_FL			0x00080000 /* Inode uses extents */
375 #define EXT4_EA_INODE_FL	        0x00200000 /* Inode used for large EA */
376 #define EXT4_EOFBLOCKS_FL		0x00400000 /* Blocks allocated beyond EOF */
377 #define EXT4_INLINE_DATA_FL		0x10000000 /* Inode has inline data. */
378 #define EXT4_PROJINHERIT_FL		0x20000000 /* Create with parents projid */
379 #define EXT4_RESERVED_FL		0x80000000 /* reserved for ext4 lib */
380 
381 #define EXT4_FL_USER_VISIBLE		0x004BDFFF /* User visible flags */
382 #define EXT4_FL_USER_MODIFIABLE		0x004380FF /* User modifiable flags */
383 
384 /* Flags that should be inherited by new inodes from their parent. */
385 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\
386 			   EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\
387 			   EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\
388 			   EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL)
389 
390 /* Flags that are appropriate for regular files (all but dir-specific ones). */
391 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL))
392 
393 /* Flags that are appropriate for non-directories/regular files. */
394 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL)
395 
396 /* Mask out flags that are inappropriate for the given type of inode. */
397 static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags)
398 {
399 	if (S_ISDIR(mode))
400 		return flags;
401 	else if (S_ISREG(mode))
402 		return flags & EXT4_REG_FLMASK;
403 	else
404 		return flags & EXT4_OTHER_FLMASK;
405 }
406 
407 /*
408  * Inode flags used for atomic set/get
409  */
410 enum {
411 	EXT4_INODE_SECRM	= 0,	/* Secure deletion */
412 	EXT4_INODE_UNRM		= 1,	/* Undelete */
413 	EXT4_INODE_COMPR	= 2,	/* Compress file */
414 	EXT4_INODE_SYNC		= 3,	/* Synchronous updates */
415 	EXT4_INODE_IMMUTABLE	= 4,	/* Immutable file */
416 	EXT4_INODE_APPEND	= 5,	/* writes to file may only append */
417 	EXT4_INODE_NODUMP	= 6,	/* do not dump file */
418 	EXT4_INODE_NOATIME	= 7,	/* do not update atime */
419 /* Reserved for compression usage... */
420 	EXT4_INODE_DIRTY	= 8,
421 	EXT4_INODE_COMPRBLK	= 9,	/* One or more compressed clusters */
422 	EXT4_INODE_NOCOMPR	= 10,	/* Don't compress */
423 	EXT4_INODE_ENCRYPT	= 11,	/* Encrypted file */
424 /* End compression flags --- maybe not all used */
425 	EXT4_INODE_INDEX	= 12,	/* hash-indexed directory */
426 	EXT4_INODE_IMAGIC	= 13,	/* AFS directory */
427 	EXT4_INODE_JOURNAL_DATA	= 14,	/* file data should be journaled */
428 	EXT4_INODE_NOTAIL	= 15,	/* file tail should not be merged */
429 	EXT4_INODE_DIRSYNC	= 16,	/* dirsync behaviour (directories only) */
430 	EXT4_INODE_TOPDIR	= 17,	/* Top of directory hierarchies*/
431 	EXT4_INODE_HUGE_FILE	= 18,	/* Set to each huge file */
432 	EXT4_INODE_EXTENTS	= 19,	/* Inode uses extents */
433 	EXT4_INODE_EA_INODE	= 21,	/* Inode used for large EA */
434 	EXT4_INODE_EOFBLOCKS	= 22,	/* Blocks allocated beyond EOF */
435 	EXT4_INODE_INLINE_DATA	= 28,	/* Data in inode. */
436 	EXT4_INODE_PROJINHERIT	= 29,	/* Create with parents projid */
437 	EXT4_INODE_RESERVED	= 31,	/* reserved for ext4 lib */
438 };
439 
440 /*
441  * Since it's pretty easy to mix up bit numbers and hex values, we use a
442  * build-time check to make sure that EXT4_XXX_FL is consistent with respect to
443  * EXT4_INODE_XXX. If all is well, the macros will be dropped, so, it won't cost
444  * any extra space in the compiled kernel image, otherwise, the build will fail.
445  * It's important that these values are the same, since we are using
446  * EXT4_INODE_XXX to test for flag values, but EXT4_XXX_FL must be consistent
447  * with the values of FS_XXX_FL defined in include/linux/fs.h and the on-disk
448  * values found in ext2, ext3 and ext4 filesystems, and of course the values
449  * defined in e2fsprogs.
450  *
451  * It's not paranoia if the Murphy's Law really *is* out to get you.  :-)
452  */
453 #define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG))
454 #define CHECK_FLAG_VALUE(FLAG) BUILD_BUG_ON(!TEST_FLAG_VALUE(FLAG))
455 
456 static inline void ext4_check_flag_values(void)
457 {
458 	CHECK_FLAG_VALUE(SECRM);
459 	CHECK_FLAG_VALUE(UNRM);
460 	CHECK_FLAG_VALUE(COMPR);
461 	CHECK_FLAG_VALUE(SYNC);
462 	CHECK_FLAG_VALUE(IMMUTABLE);
463 	CHECK_FLAG_VALUE(APPEND);
464 	CHECK_FLAG_VALUE(NODUMP);
465 	CHECK_FLAG_VALUE(NOATIME);
466 	CHECK_FLAG_VALUE(DIRTY);
467 	CHECK_FLAG_VALUE(COMPRBLK);
468 	CHECK_FLAG_VALUE(NOCOMPR);
469 	CHECK_FLAG_VALUE(ENCRYPT);
470 	CHECK_FLAG_VALUE(INDEX);
471 	CHECK_FLAG_VALUE(IMAGIC);
472 	CHECK_FLAG_VALUE(JOURNAL_DATA);
473 	CHECK_FLAG_VALUE(NOTAIL);
474 	CHECK_FLAG_VALUE(DIRSYNC);
475 	CHECK_FLAG_VALUE(TOPDIR);
476 	CHECK_FLAG_VALUE(HUGE_FILE);
477 	CHECK_FLAG_VALUE(EXTENTS);
478 	CHECK_FLAG_VALUE(EA_INODE);
479 	CHECK_FLAG_VALUE(EOFBLOCKS);
480 	CHECK_FLAG_VALUE(INLINE_DATA);
481 	CHECK_FLAG_VALUE(PROJINHERIT);
482 	CHECK_FLAG_VALUE(RESERVED);
483 }
484 
485 /* Used to pass group descriptor data when online resize is done */
486 struct ext4_new_group_input {
487 	__u32 group;		/* Group number for this data */
488 	__u64 block_bitmap;	/* Absolute block number of block bitmap */
489 	__u64 inode_bitmap;	/* Absolute block number of inode bitmap */
490 	__u64 inode_table;	/* Absolute block number of inode table start */
491 	__u32 blocks_count;	/* Total number of blocks in this group */
492 	__u16 reserved_blocks;	/* Number of reserved blocks in this group */
493 	__u16 unused;
494 };
495 
496 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
497 struct compat_ext4_new_group_input {
498 	u32 group;
499 	compat_u64 block_bitmap;
500 	compat_u64 inode_bitmap;
501 	compat_u64 inode_table;
502 	u32 blocks_count;
503 	u16 reserved_blocks;
504 	u16 unused;
505 };
506 #endif
507 
508 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */
509 struct ext4_new_group_data {
510 	__u32 group;
511 	__u64 block_bitmap;
512 	__u64 inode_bitmap;
513 	__u64 inode_table;
514 	__u32 blocks_count;
515 	__u16 reserved_blocks;
516 	__u16 unused;
517 	__u32 free_blocks_count;
518 };
519 
520 /* Indexes used to index group tables in ext4_new_group_data */
521 enum {
522 	BLOCK_BITMAP = 0,	/* block bitmap */
523 	INODE_BITMAP,		/* inode bitmap */
524 	INODE_TABLE,		/* inode tables */
525 	GROUP_TABLE_COUNT,
526 };
527 
528 /*
529  * Flags used by ext4_map_blocks()
530  */
531 	/* Allocate any needed blocks and/or convert an unwritten
532 	   extent to be an initialized ext4 */
533 #define EXT4_GET_BLOCKS_CREATE			0x0001
534 	/* Request the creation of an unwritten extent */
535 #define EXT4_GET_BLOCKS_UNWRIT_EXT		0x0002
536 #define EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT	(EXT4_GET_BLOCKS_UNWRIT_EXT|\
537 						 EXT4_GET_BLOCKS_CREATE)
538 	/* Caller is from the delayed allocation writeout path
539 	 * finally doing the actual allocation of delayed blocks */
540 #define EXT4_GET_BLOCKS_DELALLOC_RESERVE	0x0004
541 	/* caller is from the direct IO path, request to creation of an
542 	unwritten extents if not allocated, split the unwritten
543 	extent if blocks has been preallocated already*/
544 #define EXT4_GET_BLOCKS_PRE_IO			0x0008
545 #define EXT4_GET_BLOCKS_CONVERT			0x0010
546 #define EXT4_GET_BLOCKS_IO_CREATE_EXT		(EXT4_GET_BLOCKS_PRE_IO|\
547 					 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT)
548 	/* Convert extent to initialized after IO complete */
549 #define EXT4_GET_BLOCKS_IO_CONVERT_EXT		(EXT4_GET_BLOCKS_CONVERT|\
550 					 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT)
551 	/* Eventual metadata allocation (due to growing extent tree)
552 	 * should not fail, so try to use reserved blocks for that.*/
553 #define EXT4_GET_BLOCKS_METADATA_NOFAIL		0x0020
554 	/* Don't normalize allocation size (used for fallocate) */
555 #define EXT4_GET_BLOCKS_NO_NORMALIZE		0x0040
556 	/* Request will not result in inode size update (user for fallocate) */
557 #define EXT4_GET_BLOCKS_KEEP_SIZE		0x0080
558 	/* Convert written extents to unwritten */
559 #define EXT4_GET_BLOCKS_CONVERT_UNWRITTEN	0x0100
560 
561 /*
562  * The bit position of these flags must not overlap with any of the
563  * EXT4_GET_BLOCKS_*.  They are used by ext4_find_extent(),
564  * read_extent_tree_block(), ext4_split_extent_at(),
565  * ext4_ext_insert_extent(), and ext4_ext_create_new_leaf().
566  * EXT4_EX_NOCACHE is used to indicate that the we shouldn't be
567  * caching the extents when reading from the extent tree while a
568  * truncate or punch hole operation is in progress.
569  */
570 #define EXT4_EX_NOCACHE				0x40000000
571 #define EXT4_EX_FORCE_CACHE			0x20000000
572 
573 /*
574  * Flags used by ext4_free_blocks
575  */
576 #define EXT4_FREE_BLOCKS_METADATA	0x0001
577 #define EXT4_FREE_BLOCKS_FORGET		0x0002
578 #define EXT4_FREE_BLOCKS_VALIDATED	0x0004
579 #define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE	0x0008
580 #define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER	0x0010
581 #define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER	0x0020
582 
583 /* Encryption algorithms */
584 #define EXT4_ENCRYPTION_MODE_INVALID		0
585 #define EXT4_ENCRYPTION_MODE_AES_256_XTS	1
586 #define EXT4_ENCRYPTION_MODE_AES_256_GCM	2
587 #define EXT4_ENCRYPTION_MODE_AES_256_CBC	3
588 #define EXT4_ENCRYPTION_MODE_AES_256_CTS	4
589 
590 #include "ext4_crypto.h"
591 
592 /*
593  * ioctl commands
594  */
595 #define	EXT4_IOC_GETFLAGS		FS_IOC_GETFLAGS
596 #define	EXT4_IOC_SETFLAGS		FS_IOC_SETFLAGS
597 #define	EXT4_IOC_GETVERSION		_IOR('f', 3, long)
598 #define	EXT4_IOC_SETVERSION		_IOW('f', 4, long)
599 #define	EXT4_IOC_GETVERSION_OLD		FS_IOC_GETVERSION
600 #define	EXT4_IOC_SETVERSION_OLD		FS_IOC_SETVERSION
601 #define EXT4_IOC_GETRSVSZ		_IOR('f', 5, long)
602 #define EXT4_IOC_SETRSVSZ		_IOW('f', 6, long)
603 #define EXT4_IOC_GROUP_EXTEND		_IOW('f', 7, unsigned long)
604 #define EXT4_IOC_GROUP_ADD		_IOW('f', 8, struct ext4_new_group_input)
605 #define EXT4_IOC_MIGRATE		_IO('f', 9)
606  /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */
607  /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */
608 #define EXT4_IOC_ALLOC_DA_BLKS		_IO('f', 12)
609 #define EXT4_IOC_MOVE_EXT		_IOWR('f', 15, struct move_extent)
610 #define EXT4_IOC_RESIZE_FS		_IOW('f', 16, __u64)
611 #define EXT4_IOC_SWAP_BOOT		_IO('f', 17)
612 #define EXT4_IOC_PRECACHE_EXTENTS	_IO('f', 18)
613 #define EXT4_IOC_SET_ENCRYPTION_POLICY	_IOR('f', 19, struct ext4_encryption_policy)
614 #define EXT4_IOC_GET_ENCRYPTION_PWSALT	_IOW('f', 20, __u8[16])
615 #define EXT4_IOC_GET_ENCRYPTION_POLICY	_IOW('f', 21, struct ext4_encryption_policy)
616 
617 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
618 /*
619  * ioctl commands in 32 bit emulation
620  */
621 #define EXT4_IOC32_GETFLAGS		FS_IOC32_GETFLAGS
622 #define EXT4_IOC32_SETFLAGS		FS_IOC32_SETFLAGS
623 #define EXT4_IOC32_GETVERSION		_IOR('f', 3, int)
624 #define EXT4_IOC32_SETVERSION		_IOW('f', 4, int)
625 #define EXT4_IOC32_GETRSVSZ		_IOR('f', 5, int)
626 #define EXT4_IOC32_SETRSVSZ		_IOW('f', 6, int)
627 #define EXT4_IOC32_GROUP_EXTEND		_IOW('f', 7, unsigned int)
628 #define EXT4_IOC32_GROUP_ADD		_IOW('f', 8, struct compat_ext4_new_group_input)
629 #define EXT4_IOC32_GETVERSION_OLD	FS_IOC32_GETVERSION
630 #define EXT4_IOC32_SETVERSION_OLD	FS_IOC32_SETVERSION
631 #endif
632 
633 /* Max physical block we can address w/o extents */
634 #define EXT4_MAX_BLOCK_FILE_PHYS	0xFFFFFFFF
635 
636 /*
637  * Structure of an inode on the disk
638  */
639 struct ext4_inode {
640 	__le16	i_mode;		/* File mode */
641 	__le16	i_uid;		/* Low 16 bits of Owner Uid */
642 	__le32	i_size_lo;	/* Size in bytes */
643 	__le32	i_atime;	/* Access time */
644 	__le32	i_ctime;	/* Inode Change time */
645 	__le32	i_mtime;	/* Modification time */
646 	__le32	i_dtime;	/* Deletion Time */
647 	__le16	i_gid;		/* Low 16 bits of Group Id */
648 	__le16	i_links_count;	/* Links count */
649 	__le32	i_blocks_lo;	/* Blocks count */
650 	__le32	i_flags;	/* File flags */
651 	union {
652 		struct {
653 			__le32  l_i_version;
654 		} linux1;
655 		struct {
656 			__u32  h_i_translator;
657 		} hurd1;
658 		struct {
659 			__u32  m_i_reserved1;
660 		} masix1;
661 	} osd1;				/* OS dependent 1 */
662 	__le32	i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
663 	__le32	i_generation;	/* File version (for NFS) */
664 	__le32	i_file_acl_lo;	/* File ACL */
665 	__le32	i_size_high;
666 	__le32	i_obso_faddr;	/* Obsoleted fragment address */
667 	union {
668 		struct {
669 			__le16	l_i_blocks_high; /* were l_i_reserved1 */
670 			__le16	l_i_file_acl_high;
671 			__le16	l_i_uid_high;	/* these 2 fields */
672 			__le16	l_i_gid_high;	/* were reserved2[0] */
673 			__le16	l_i_checksum_lo;/* crc32c(uuid+inum+inode) LE */
674 			__le16	l_i_reserved;
675 		} linux2;
676 		struct {
677 			__le16	h_i_reserved1;	/* Obsoleted fragment number/size which are removed in ext4 */
678 			__u16	h_i_mode_high;
679 			__u16	h_i_uid_high;
680 			__u16	h_i_gid_high;
681 			__u32	h_i_author;
682 		} hurd2;
683 		struct {
684 			__le16	h_i_reserved1;	/* Obsoleted fragment number/size which are removed in ext4 */
685 			__le16	m_i_file_acl_high;
686 			__u32	m_i_reserved2[2];
687 		} masix2;
688 	} osd2;				/* OS dependent 2 */
689 	__le16	i_extra_isize;
690 	__le16	i_checksum_hi;	/* crc32c(uuid+inum+inode) BE */
691 	__le32  i_ctime_extra;  /* extra Change time      (nsec << 2 | epoch) */
692 	__le32  i_mtime_extra;  /* extra Modification time(nsec << 2 | epoch) */
693 	__le32  i_atime_extra;  /* extra Access time      (nsec << 2 | epoch) */
694 	__le32  i_crtime;       /* File Creation time */
695 	__le32  i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */
696 	__le32  i_version_hi;	/* high 32 bits for 64-bit version */
697 	__le32	i_projid;	/* Project ID */
698 };
699 
700 struct move_extent {
701 	__u32 reserved;		/* should be zero */
702 	__u32 donor_fd;		/* donor file descriptor */
703 	__u64 orig_start;	/* logical start offset in block for orig */
704 	__u64 donor_start;	/* logical start offset in block for donor */
705 	__u64 len;		/* block length to be moved */
706 	__u64 moved_len;	/* moved block length */
707 };
708 
709 #define EXT4_EPOCH_BITS 2
710 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
711 #define EXT4_NSEC_MASK  (~0UL << EXT4_EPOCH_BITS)
712 
713 /*
714  * Extended fields will fit into an inode if the filesystem was formatted
715  * with large inodes (-I 256 or larger) and there are not currently any EAs
716  * consuming all of the available space. For new inodes we always reserve
717  * enough space for the kernel's known extended fields, but for inodes
718  * created with an old kernel this might not have been the case. None of
719  * the extended inode fields is critical for correct filesystem operation.
720  * This macro checks if a certain field fits in the inode. Note that
721  * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
722  */
723 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field)	\
724 	((offsetof(typeof(*ext4_inode), field) +	\
725 	  sizeof((ext4_inode)->field))			\
726 	<= (EXT4_GOOD_OLD_INODE_SIZE +			\
727 	    (einode)->i_extra_isize))			\
728 
729 /*
730  * We use an encoding that preserves the times for extra epoch "00":
731  *
732  * extra  msb of                         adjust for signed
733  * epoch  32-bit                         32-bit tv_sec to
734  * bits   time    decoded 64-bit tv_sec  64-bit tv_sec      valid time range
735  * 0 0    1    -0x80000000..-0x00000001  0x000000000 1901-12-13..1969-12-31
736  * 0 0    0    0x000000000..0x07fffffff  0x000000000 1970-01-01..2038-01-19
737  * 0 1    1    0x080000000..0x0ffffffff  0x100000000 2038-01-19..2106-02-07
738  * 0 1    0    0x100000000..0x17fffffff  0x100000000 2106-02-07..2174-02-25
739  * 1 0    1    0x180000000..0x1ffffffff  0x200000000 2174-02-25..2242-03-16
740  * 1 0    0    0x200000000..0x27fffffff  0x200000000 2242-03-16..2310-04-04
741  * 1 1    1    0x280000000..0x2ffffffff  0x300000000 2310-04-04..2378-04-22
742  * 1 1    0    0x300000000..0x37fffffff  0x300000000 2378-04-22..2446-05-10
743  *
744  * Note that previous versions of the kernel on 64-bit systems would
745  * incorrectly use extra epoch bits 1,1 for dates between 1901 and
746  * 1970.  e2fsck will correct this, assuming that it is run on the
747  * affected filesystem before 2242.
748  */
749 
750 static inline __le32 ext4_encode_extra_time(struct timespec *time)
751 {
752 	u32 extra = sizeof(time->tv_sec) > 4 ?
753 		((time->tv_sec - (s32)time->tv_sec) >> 32) & EXT4_EPOCH_MASK : 0;
754 	return cpu_to_le32(extra | (time->tv_nsec << EXT4_EPOCH_BITS));
755 }
756 
757 static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra)
758 {
759 	if (unlikely(sizeof(time->tv_sec) > 4 &&
760 			(extra & cpu_to_le32(EXT4_EPOCH_MASK)))) {
761 #if LINUX_VERSION_CODE < KERNEL_VERSION(4,20,0)
762 		/* Handle legacy encoding of pre-1970 dates with epoch
763 		 * bits 1,1.  We assume that by kernel version 4.20,
764 		 * everyone will have run fsck over the affected
765 		 * filesystems to correct the problem.  (This
766 		 * backwards compatibility may be removed before this
767 		 * time, at the discretion of the ext4 developers.)
768 		 */
769 		u64 extra_bits = le32_to_cpu(extra) & EXT4_EPOCH_MASK;
770 		if (extra_bits == 3 && ((time->tv_sec) & 0x80000000) != 0)
771 			extra_bits = 0;
772 		time->tv_sec += extra_bits << 32;
773 #else
774 		time->tv_sec += (u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) << 32;
775 #endif
776 	}
777 	time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS;
778 }
779 
780 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode)			       \
781 do {									       \
782 	(raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec);	       \
783 	if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra))     \
784 		(raw_inode)->xtime ## _extra =				       \
785 				ext4_encode_extra_time(&(inode)->xtime);       \
786 } while (0)
787 
788 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode)			       \
789 do {									       \
790 	if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime))		       \
791 		(raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec);      \
792 	if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra))	       \
793 		(raw_inode)->xtime ## _extra =				       \
794 				ext4_encode_extra_time(&(einode)->xtime);      \
795 } while (0)
796 
797 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode)			       \
798 do {									       \
799 	(inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime);       \
800 	if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra))     \
801 		ext4_decode_extra_time(&(inode)->xtime,			       \
802 				       raw_inode->xtime ## _extra);	       \
803 	else								       \
804 		(inode)->xtime.tv_nsec = 0;				       \
805 } while (0)
806 
807 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode)			       \
808 do {									       \
809 	if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime))		       \
810 		(einode)->xtime.tv_sec = 				       \
811 			(signed)le32_to_cpu((raw_inode)->xtime);	       \
812 	else								       \
813 		(einode)->xtime.tv_sec = 0;				       \
814 	if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra))	       \
815 		ext4_decode_extra_time(&(einode)->xtime,		       \
816 				       raw_inode->xtime ## _extra);	       \
817 	else								       \
818 		(einode)->xtime.tv_nsec = 0;				       \
819 } while (0)
820 
821 #define i_disk_version osd1.linux1.l_i_version
822 
823 #if defined(__KERNEL__) || defined(__linux__)
824 #define i_reserved1	osd1.linux1.l_i_reserved1
825 #define i_file_acl_high	osd2.linux2.l_i_file_acl_high
826 #define i_blocks_high	osd2.linux2.l_i_blocks_high
827 #define i_uid_low	i_uid
828 #define i_gid_low	i_gid
829 #define i_uid_high	osd2.linux2.l_i_uid_high
830 #define i_gid_high	osd2.linux2.l_i_gid_high
831 #define i_checksum_lo	osd2.linux2.l_i_checksum_lo
832 
833 #elif defined(__GNU__)
834 
835 #define i_translator	osd1.hurd1.h_i_translator
836 #define i_uid_high	osd2.hurd2.h_i_uid_high
837 #define i_gid_high	osd2.hurd2.h_i_gid_high
838 #define i_author	osd2.hurd2.h_i_author
839 
840 #elif defined(__masix__)
841 
842 #define i_reserved1	osd1.masix1.m_i_reserved1
843 #define i_file_acl_high	osd2.masix2.m_i_file_acl_high
844 #define i_reserved2	osd2.masix2.m_i_reserved2
845 
846 #endif /* defined(__KERNEL__) || defined(__linux__) */
847 
848 #include "extents_status.h"
849 
850 /*
851  * fourth extended file system inode data in memory
852  */
853 struct ext4_inode_info {
854 	__le32	i_data[15];	/* unconverted */
855 	__u32	i_dtime;
856 	ext4_fsblk_t	i_file_acl;
857 
858 	/*
859 	 * i_block_group is the number of the block group which contains
860 	 * this file's inode.  Constant across the lifetime of the inode,
861 	 * it is ued for making block allocation decisions - we try to
862 	 * place a file's data blocks near its inode block, and new inodes
863 	 * near to their parent directory's inode.
864 	 */
865 	ext4_group_t	i_block_group;
866 	ext4_lblk_t	i_dir_start_lookup;
867 #if (BITS_PER_LONG < 64)
868 	unsigned long	i_state_flags;		/* Dynamic state flags */
869 #endif
870 	unsigned long	i_flags;
871 
872 	/*
873 	 * Extended attributes can be read independently of the main file
874 	 * data. Taking i_mutex even when reading would cause contention
875 	 * between readers of EAs and writers of regular file data, so
876 	 * instead we synchronize on xattr_sem when reading or changing
877 	 * EAs.
878 	 */
879 	struct rw_semaphore xattr_sem;
880 
881 	struct list_head i_orphan;	/* unlinked but open inodes */
882 
883 	/*
884 	 * i_disksize keeps track of what the inode size is ON DISK, not
885 	 * in memory.  During truncate, i_size is set to the new size by
886 	 * the VFS prior to calling ext4_truncate(), but the filesystem won't
887 	 * set i_disksize to 0 until the truncate is actually under way.
888 	 *
889 	 * The intent is that i_disksize always represents the blocks which
890 	 * are used by this file.  This allows recovery to restart truncate
891 	 * on orphans if we crash during truncate.  We actually write i_disksize
892 	 * into the on-disk inode when writing inodes out, instead of i_size.
893 	 *
894 	 * The only time when i_disksize and i_size may be different is when
895 	 * a truncate is in progress.  The only things which change i_disksize
896 	 * are ext4_get_block (growth) and ext4_truncate (shrinkth).
897 	 */
898 	loff_t	i_disksize;
899 
900 	/*
901 	 * i_data_sem is for serialising ext4_truncate() against
902 	 * ext4_getblock().  In the 2.4 ext2 design, great chunks of inode's
903 	 * data tree are chopped off during truncate. We can't do that in
904 	 * ext4 because whenever we perform intermediate commits during
905 	 * truncate, the inode and all the metadata blocks *must* be in a
906 	 * consistent state which allows truncation of the orphans to restart
907 	 * during recovery.  Hence we must fix the get_block-vs-truncate race
908 	 * by other means, so we have i_data_sem.
909 	 */
910 	struct rw_semaphore i_data_sem;
911 	/*
912 	 * i_mmap_sem is for serializing page faults with truncate / punch hole
913 	 * operations. We have to make sure that new page cannot be faulted in
914 	 * a section of the inode that is being punched. We cannot easily use
915 	 * i_data_sem for this since we need protection for the whole punch
916 	 * operation and i_data_sem ranks below transaction start so we have
917 	 * to occasionally drop it.
918 	 */
919 	struct rw_semaphore i_mmap_sem;
920 	struct inode vfs_inode;
921 	struct jbd2_inode *jinode;
922 
923 	spinlock_t i_raw_lock;	/* protects updates to the raw inode */
924 
925 	/*
926 	 * File creation time. Its function is same as that of
927 	 * struct timespec i_{a,c,m}time in the generic inode.
928 	 */
929 	struct timespec i_crtime;
930 
931 	/* mballoc */
932 	struct list_head i_prealloc_list;
933 	spinlock_t i_prealloc_lock;
934 
935 	/* extents status tree */
936 	struct ext4_es_tree i_es_tree;
937 	rwlock_t i_es_lock;
938 	struct list_head i_es_list;
939 	unsigned int i_es_all_nr;	/* protected by i_es_lock */
940 	unsigned int i_es_shk_nr;	/* protected by i_es_lock */
941 	ext4_lblk_t i_es_shrink_lblk;	/* Offset where we start searching for
942 					   extents to shrink. Protected by
943 					   i_es_lock  */
944 
945 	/* ialloc */
946 	ext4_group_t	i_last_alloc_group;
947 
948 	/* allocation reservation info for delalloc */
949 	/* In case of bigalloc, these refer to clusters rather than blocks */
950 	unsigned int i_reserved_data_blocks;
951 	unsigned int i_reserved_meta_blocks;
952 	unsigned int i_allocated_meta_blocks;
953 	ext4_lblk_t i_da_metadata_calc_last_lblock;
954 	int i_da_metadata_calc_len;
955 
956 	/* on-disk additional length */
957 	__u16 i_extra_isize;
958 
959 	/* Indicate the inline data space. */
960 	u16 i_inline_off;
961 	u16 i_inline_size;
962 
963 #ifdef CONFIG_QUOTA
964 	/* quota space reservation, managed internally by quota code */
965 	qsize_t i_reserved_quota;
966 #endif
967 
968 	/* Lock protecting lists below */
969 	spinlock_t i_completed_io_lock;
970 	/*
971 	 * Completed IOs that need unwritten extents handling and have
972 	 * transaction reserved
973 	 */
974 	struct list_head i_rsv_conversion_list;
975 	/*
976 	 * Completed IOs that need unwritten extents handling and don't have
977 	 * transaction reserved
978 	 */
979 	atomic_t i_ioend_count;	/* Number of outstanding io_end structs */
980 	atomic_t i_unwritten; /* Nr. of inflight conversions pending */
981 	struct work_struct i_rsv_conversion_work;
982 
983 	spinlock_t i_block_reservation_lock;
984 
985 	/*
986 	 * Transactions that contain inode's metadata needed to complete
987 	 * fsync and fdatasync, respectively.
988 	 */
989 	tid_t i_sync_tid;
990 	tid_t i_datasync_tid;
991 
992 #ifdef CONFIG_QUOTA
993 	struct dquot *i_dquot[MAXQUOTAS];
994 #endif
995 
996 	/* Precomputed uuid+inum+igen checksum for seeding inode checksums */
997 	__u32 i_csum_seed;
998 
999 #ifdef CONFIG_EXT4_FS_ENCRYPTION
1000 	/* Encryption params */
1001 	struct ext4_crypt_info *i_crypt_info;
1002 #endif
1003 };
1004 
1005 /*
1006  * File system states
1007  */
1008 #define	EXT4_VALID_FS			0x0001	/* Unmounted cleanly */
1009 #define	EXT4_ERROR_FS			0x0002	/* Errors detected */
1010 #define	EXT4_ORPHAN_FS			0x0004	/* Orphans being recovered */
1011 
1012 /*
1013  * Misc. filesystem flags
1014  */
1015 #define EXT2_FLAGS_SIGNED_HASH		0x0001  /* Signed dirhash in use */
1016 #define EXT2_FLAGS_UNSIGNED_HASH	0x0002  /* Unsigned dirhash in use */
1017 #define EXT2_FLAGS_TEST_FILESYS		0x0004	/* to test development code */
1018 
1019 /*
1020  * Mount flags set via mount options or defaults
1021  */
1022 #define EXT4_MOUNT_GRPID		0x00004	/* Create files with directory's group */
1023 #define EXT4_MOUNT_DEBUG		0x00008	/* Some debugging messages */
1024 #define EXT4_MOUNT_ERRORS_CONT		0x00010	/* Continue on errors */
1025 #define EXT4_MOUNT_ERRORS_RO		0x00020	/* Remount fs ro on errors */
1026 #define EXT4_MOUNT_ERRORS_PANIC		0x00040	/* Panic on errors */
1027 #define EXT4_MOUNT_ERRORS_MASK		0x00070
1028 #define EXT4_MOUNT_MINIX_DF		0x00080	/* Mimics the Minix statfs */
1029 #define EXT4_MOUNT_NOLOAD		0x00100	/* Don't use existing journal*/
1030 #ifdef CONFIG_FS_DAX
1031 #define EXT4_MOUNT_DAX			0x00200	/* Direct Access */
1032 #else
1033 #define EXT4_MOUNT_DAX			0
1034 #endif
1035 #define EXT4_MOUNT_DATA_FLAGS		0x00C00	/* Mode for data writes: */
1036 #define EXT4_MOUNT_JOURNAL_DATA		0x00400	/* Write data to journal */
1037 #define EXT4_MOUNT_ORDERED_DATA		0x00800	/* Flush data before commit */
1038 #define EXT4_MOUNT_WRITEBACK_DATA	0x00C00	/* No data ordering */
1039 #define EXT4_MOUNT_UPDATE_JOURNAL	0x01000	/* Update the journal format */
1040 #define EXT4_MOUNT_NO_UID32		0x02000  /* Disable 32-bit UIDs */
1041 #define EXT4_MOUNT_XATTR_USER		0x04000	/* Extended user attributes */
1042 #define EXT4_MOUNT_POSIX_ACL		0x08000	/* POSIX Access Control Lists */
1043 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC	0x10000	/* No auto delalloc mapping */
1044 #define EXT4_MOUNT_BARRIER		0x20000 /* Use block barriers */
1045 #define EXT4_MOUNT_QUOTA		0x80000 /* Some quota option set */
1046 #define EXT4_MOUNT_USRQUOTA		0x100000 /* "old" user quota */
1047 #define EXT4_MOUNT_GRPQUOTA		0x200000 /* "old" group quota */
1048 #define EXT4_MOUNT_DIOREAD_NOLOCK	0x400000 /* Enable support for dio read nolocking */
1049 #define EXT4_MOUNT_JOURNAL_CHECKSUM	0x800000 /* Journal checksums */
1050 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT	0x1000000 /* Journal Async Commit */
1051 #define EXT4_MOUNT_DELALLOC		0x8000000 /* Delalloc support */
1052 #define EXT4_MOUNT_DATA_ERR_ABORT	0x10000000 /* Abort on file data write */
1053 #define EXT4_MOUNT_BLOCK_VALIDITY	0x20000000 /* Block validity checking */
1054 #define EXT4_MOUNT_DISCARD		0x40000000 /* Issue DISCARD requests */
1055 #define EXT4_MOUNT_INIT_INODE_TABLE	0x80000000 /* Initialize uninitialized itables */
1056 
1057 /*
1058  * Mount flags set either automatically (could not be set by mount option)
1059  * based on per file system feature or property or in special cases such as
1060  * distinguishing between explicit mount option definition and default.
1061  */
1062 #define EXT4_MOUNT2_EXPLICIT_DELALLOC	0x00000001 /* User explicitly
1063 						      specified delalloc */
1064 #define EXT4_MOUNT2_STD_GROUP_SIZE	0x00000002 /* We have standard group
1065 						      size of blocksize * 8
1066 						      blocks */
1067 #define EXT4_MOUNT2_HURD_COMPAT		0x00000004 /* Support HURD-castrated
1068 						      file systems */
1069 
1070 #define EXT4_MOUNT2_EXPLICIT_JOURNAL_CHECKSUM	0x00000008 /* User explicitly
1071 						specified journal checksum */
1072 
1073 #define clear_opt(sb, opt)		EXT4_SB(sb)->s_mount_opt &= \
1074 						~EXT4_MOUNT_##opt
1075 #define set_opt(sb, opt)		EXT4_SB(sb)->s_mount_opt |= \
1076 						EXT4_MOUNT_##opt
1077 #define test_opt(sb, opt)		(EXT4_SB(sb)->s_mount_opt & \
1078 					 EXT4_MOUNT_##opt)
1079 
1080 #define clear_opt2(sb, opt)		EXT4_SB(sb)->s_mount_opt2 &= \
1081 						~EXT4_MOUNT2_##opt
1082 #define set_opt2(sb, opt)		EXT4_SB(sb)->s_mount_opt2 |= \
1083 						EXT4_MOUNT2_##opt
1084 #define test_opt2(sb, opt)		(EXT4_SB(sb)->s_mount_opt2 & \
1085 					 EXT4_MOUNT2_##opt)
1086 
1087 #define ext4_test_and_set_bit		__test_and_set_bit_le
1088 #define ext4_set_bit			__set_bit_le
1089 #define ext4_set_bit_atomic		ext2_set_bit_atomic
1090 #define ext4_test_and_clear_bit		__test_and_clear_bit_le
1091 #define ext4_clear_bit			__clear_bit_le
1092 #define ext4_clear_bit_atomic		ext2_clear_bit_atomic
1093 #define ext4_test_bit			test_bit_le
1094 #define ext4_find_next_zero_bit		find_next_zero_bit_le
1095 #define ext4_find_next_bit		find_next_bit_le
1096 
1097 extern void ext4_set_bits(void *bm, int cur, int len);
1098 
1099 /*
1100  * Maximal mount counts between two filesystem checks
1101  */
1102 #define EXT4_DFL_MAX_MNT_COUNT		20	/* Allow 20 mounts */
1103 #define EXT4_DFL_CHECKINTERVAL		0	/* Don't use interval check */
1104 
1105 /*
1106  * Behaviour when detecting errors
1107  */
1108 #define EXT4_ERRORS_CONTINUE		1	/* Continue execution */
1109 #define EXT4_ERRORS_RO			2	/* Remount fs read-only */
1110 #define EXT4_ERRORS_PANIC		3	/* Panic */
1111 #define EXT4_ERRORS_DEFAULT		EXT4_ERRORS_CONTINUE
1112 
1113 /* Metadata checksum algorithm codes */
1114 #define EXT4_CRC32C_CHKSUM		1
1115 
1116 /*
1117  * Structure of the super block
1118  */
1119 struct ext4_super_block {
1120 /*00*/	__le32	s_inodes_count;		/* Inodes count */
1121 	__le32	s_blocks_count_lo;	/* Blocks count */
1122 	__le32	s_r_blocks_count_lo;	/* Reserved blocks count */
1123 	__le32	s_free_blocks_count_lo;	/* Free blocks count */
1124 /*10*/	__le32	s_free_inodes_count;	/* Free inodes count */
1125 	__le32	s_first_data_block;	/* First Data Block */
1126 	__le32	s_log_block_size;	/* Block size */
1127 	__le32	s_log_cluster_size;	/* Allocation cluster size */
1128 /*20*/	__le32	s_blocks_per_group;	/* # Blocks per group */
1129 	__le32	s_clusters_per_group;	/* # Clusters per group */
1130 	__le32	s_inodes_per_group;	/* # Inodes per group */
1131 	__le32	s_mtime;		/* Mount time */
1132 /*30*/	__le32	s_wtime;		/* Write time */
1133 	__le16	s_mnt_count;		/* Mount count */
1134 	__le16	s_max_mnt_count;	/* Maximal mount count */
1135 	__le16	s_magic;		/* Magic signature */
1136 	__le16	s_state;		/* File system state */
1137 	__le16	s_errors;		/* Behaviour when detecting errors */
1138 	__le16	s_minor_rev_level;	/* minor revision level */
1139 /*40*/	__le32	s_lastcheck;		/* time of last check */
1140 	__le32	s_checkinterval;	/* max. time between checks */
1141 	__le32	s_creator_os;		/* OS */
1142 	__le32	s_rev_level;		/* Revision level */
1143 /*50*/	__le16	s_def_resuid;		/* Default uid for reserved blocks */
1144 	__le16	s_def_resgid;		/* Default gid for reserved blocks */
1145 	/*
1146 	 * These fields are for EXT4_DYNAMIC_REV superblocks only.
1147 	 *
1148 	 * Note: the difference between the compatible feature set and
1149 	 * the incompatible feature set is that if there is a bit set
1150 	 * in the incompatible feature set that the kernel doesn't
1151 	 * know about, it should refuse to mount the filesystem.
1152 	 *
1153 	 * e2fsck's requirements are more strict; if it doesn't know
1154 	 * about a feature in either the compatible or incompatible
1155 	 * feature set, it must abort and not try to meddle with
1156 	 * things it doesn't understand...
1157 	 */
1158 	__le32	s_first_ino;		/* First non-reserved inode */
1159 	__le16  s_inode_size;		/* size of inode structure */
1160 	__le16	s_block_group_nr;	/* block group # of this superblock */
1161 	__le32	s_feature_compat;	/* compatible feature set */
1162 /*60*/	__le32	s_feature_incompat;	/* incompatible feature set */
1163 	__le32	s_feature_ro_compat;	/* readonly-compatible feature set */
1164 /*68*/	__u8	s_uuid[16];		/* 128-bit uuid for volume */
1165 /*78*/	char	s_volume_name[16];	/* volume name */
1166 /*88*/	char	s_last_mounted[64];	/* directory where last mounted */
1167 /*C8*/	__le32	s_algorithm_usage_bitmap; /* For compression */
1168 	/*
1169 	 * Performance hints.  Directory preallocation should only
1170 	 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
1171 	 */
1172 	__u8	s_prealloc_blocks;	/* Nr of blocks to try to preallocate*/
1173 	__u8	s_prealloc_dir_blocks;	/* Nr to preallocate for dirs */
1174 	__le16	s_reserved_gdt_blocks;	/* Per group desc for online growth */
1175 	/*
1176 	 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
1177 	 */
1178 /*D0*/	__u8	s_journal_uuid[16];	/* uuid of journal superblock */
1179 /*E0*/	__le32	s_journal_inum;		/* inode number of journal file */
1180 	__le32	s_journal_dev;		/* device number of journal file */
1181 	__le32	s_last_orphan;		/* start of list of inodes to delete */
1182 	__le32	s_hash_seed[4];		/* HTREE hash seed */
1183 	__u8	s_def_hash_version;	/* Default hash version to use */
1184 	__u8	s_jnl_backup_type;
1185 	__le16  s_desc_size;		/* size of group descriptor */
1186 /*100*/	__le32	s_default_mount_opts;
1187 	__le32	s_first_meta_bg;	/* First metablock block group */
1188 	__le32	s_mkfs_time;		/* When the filesystem was created */
1189 	__le32	s_jnl_blocks[17];	/* Backup of the journal inode */
1190 	/* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
1191 /*150*/	__le32	s_blocks_count_hi;	/* Blocks count */
1192 	__le32	s_r_blocks_count_hi;	/* Reserved blocks count */
1193 	__le32	s_free_blocks_count_hi;	/* Free blocks count */
1194 	__le16	s_min_extra_isize;	/* All inodes have at least # bytes */
1195 	__le16	s_want_extra_isize; 	/* New inodes should reserve # bytes */
1196 	__le32	s_flags;		/* Miscellaneous flags */
1197 	__le16  s_raid_stride;		/* RAID stride */
1198 	__le16  s_mmp_update_interval;  /* # seconds to wait in MMP checking */
1199 	__le64  s_mmp_block;            /* Block for multi-mount protection */
1200 	__le32  s_raid_stripe_width;    /* blocks on all data disks (N*stride)*/
1201 	__u8	s_log_groups_per_flex;  /* FLEX_BG group size */
1202 	__u8	s_checksum_type;	/* metadata checksum algorithm used */
1203 	__u8	s_encryption_level;	/* versioning level for encryption */
1204 	__u8	s_reserved_pad;		/* Padding to next 32bits */
1205 	__le64	s_kbytes_written;	/* nr of lifetime kilobytes written */
1206 	__le32	s_snapshot_inum;	/* Inode number of active snapshot */
1207 	__le32	s_snapshot_id;		/* sequential ID of active snapshot */
1208 	__le64	s_snapshot_r_blocks_count; /* reserved blocks for active
1209 					      snapshot's future use */
1210 	__le32	s_snapshot_list;	/* inode number of the head of the
1211 					   on-disk snapshot list */
1212 #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count)
1213 	__le32	s_error_count;		/* number of fs errors */
1214 	__le32	s_first_error_time;	/* first time an error happened */
1215 	__le32	s_first_error_ino;	/* inode involved in first error */
1216 	__le64	s_first_error_block;	/* block involved of first error */
1217 	__u8	s_first_error_func[32];	/* function where the error happened */
1218 	__le32	s_first_error_line;	/* line number where error happened */
1219 	__le32	s_last_error_time;	/* most recent time of an error */
1220 	__le32	s_last_error_ino;	/* inode involved in last error */
1221 	__le32	s_last_error_line;	/* line number where error happened */
1222 	__le64	s_last_error_block;	/* block involved of last error */
1223 	__u8	s_last_error_func[32];	/* function where the error happened */
1224 #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts)
1225 	__u8	s_mount_opts[64];
1226 	__le32	s_usr_quota_inum;	/* inode for tracking user quota */
1227 	__le32	s_grp_quota_inum;	/* inode for tracking group quota */
1228 	__le32	s_overhead_clusters;	/* overhead blocks/clusters in fs */
1229 	__le32	s_backup_bgs[2];	/* groups with sparse_super2 SBs */
1230 	__u8	s_encrypt_algos[4];	/* Encryption algorithms in use  */
1231 	__u8	s_encrypt_pw_salt[16];	/* Salt used for string2key algorithm */
1232 	__le32	s_lpf_ino;		/* Location of the lost+found inode */
1233 	__le32	s_prj_quota_inum;	/* inode for tracking project quota */
1234 	__le32	s_checksum_seed;	/* crc32c(uuid) if csum_seed set */
1235 	__le32	s_reserved[98];		/* Padding to the end of the block */
1236 	__le32	s_checksum;		/* crc32c(superblock) */
1237 };
1238 
1239 #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START)
1240 
1241 #ifdef __KERNEL__
1242 
1243 /*
1244  * run-time mount flags
1245  */
1246 #define EXT4_MF_MNTDIR_SAMPLED		0x0001
1247 #define EXT4_MF_FS_ABORTED		0x0002	/* Fatal error detected */
1248 #define EXT4_MF_TEST_DUMMY_ENCRYPTION	0x0004
1249 
1250 #ifdef CONFIG_EXT4_FS_ENCRYPTION
1251 #define DUMMY_ENCRYPTION_ENABLED(sbi) (unlikely((sbi)->s_mount_flags & \
1252 						EXT4_MF_TEST_DUMMY_ENCRYPTION))
1253 #else
1254 #define DUMMY_ENCRYPTION_ENABLED(sbi) (0)
1255 #endif
1256 
1257 /* Number of quota types we support */
1258 #define EXT4_MAXQUOTAS 2
1259 
1260 /*
1261  * fourth extended-fs super-block data in memory
1262  */
1263 struct ext4_sb_info {
1264 	unsigned long s_desc_size;	/* Size of a group descriptor in bytes */
1265 	unsigned long s_inodes_per_block;/* Number of inodes per block */
1266 	unsigned long s_blocks_per_group;/* Number of blocks in a group */
1267 	unsigned long s_clusters_per_group; /* Number of clusters in a group */
1268 	unsigned long s_inodes_per_group;/* Number of inodes in a group */
1269 	unsigned long s_itb_per_group;	/* Number of inode table blocks per group */
1270 	unsigned long s_gdb_count;	/* Number of group descriptor blocks */
1271 	unsigned long s_desc_per_block;	/* Number of group descriptors per block */
1272 	ext4_group_t s_groups_count;	/* Number of groups in the fs */
1273 	ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */
1274 	unsigned long s_overhead;  /* # of fs overhead clusters */
1275 	unsigned int s_cluster_ratio;	/* Number of blocks per cluster */
1276 	unsigned int s_cluster_bits;	/* log2 of s_cluster_ratio */
1277 	loff_t s_bitmap_maxbytes;	/* max bytes for bitmap files */
1278 	struct buffer_head * s_sbh;	/* Buffer containing the super block */
1279 	struct ext4_super_block *s_es;	/* Pointer to the super block in the buffer */
1280 	struct buffer_head **s_group_desc;
1281 	unsigned int s_mount_opt;
1282 	unsigned int s_mount_opt2;
1283 	unsigned int s_mount_flags;
1284 	unsigned int s_def_mount_opt;
1285 	ext4_fsblk_t s_sb_block;
1286 	atomic64_t s_resv_clusters;
1287 	kuid_t s_resuid;
1288 	kgid_t s_resgid;
1289 	unsigned short s_mount_state;
1290 	unsigned short s_pad;
1291 	int s_addr_per_block_bits;
1292 	int s_desc_per_block_bits;
1293 	int s_inode_size;
1294 	int s_first_ino;
1295 	unsigned int s_inode_readahead_blks;
1296 	unsigned int s_inode_goal;
1297 	spinlock_t s_next_gen_lock;
1298 	u32 s_next_generation;
1299 	u32 s_hash_seed[4];
1300 	int s_def_hash_version;
1301 	int s_hash_unsigned;	/* 3 if hash should be signed, 0 if not */
1302 	struct percpu_counter s_freeclusters_counter;
1303 	struct percpu_counter s_freeinodes_counter;
1304 	struct percpu_counter s_dirs_counter;
1305 	struct percpu_counter s_dirtyclusters_counter;
1306 	struct blockgroup_lock *s_blockgroup_lock;
1307 	struct proc_dir_entry *s_proc;
1308 	struct kobject s_kobj;
1309 	struct completion s_kobj_unregister;
1310 	struct super_block *s_sb;
1311 
1312 	/* Journaling */
1313 	struct journal_s *s_journal;
1314 	struct list_head s_orphan;
1315 	struct mutex s_orphan_lock;
1316 	unsigned long s_resize_flags;		/* Flags indicating if there
1317 						   is a resizer */
1318 	unsigned long s_commit_interval;
1319 	u32 s_max_batch_time;
1320 	u32 s_min_batch_time;
1321 	struct block_device *journal_bdev;
1322 #ifdef CONFIG_QUOTA
1323 	char *s_qf_names[EXT4_MAXQUOTAS];	/* Names of quota files with journalled quota */
1324 	int s_jquota_fmt;			/* Format of quota to use */
1325 #endif
1326 	unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */
1327 	struct rb_root system_blks;
1328 
1329 #ifdef EXTENTS_STATS
1330 	/* ext4 extents stats */
1331 	unsigned long s_ext_min;
1332 	unsigned long s_ext_max;
1333 	unsigned long s_depth_max;
1334 	spinlock_t s_ext_stats_lock;
1335 	unsigned long s_ext_blocks;
1336 	unsigned long s_ext_extents;
1337 #endif
1338 
1339 	/* for buddy allocator */
1340 	struct ext4_group_info ***s_group_info;
1341 	struct inode *s_buddy_cache;
1342 	spinlock_t s_md_lock;
1343 	unsigned short *s_mb_offsets;
1344 	unsigned int *s_mb_maxs;
1345 	unsigned int s_group_info_size;
1346 
1347 	/* tunables */
1348 	unsigned long s_stripe;
1349 	unsigned int s_mb_stream_request;
1350 	unsigned int s_mb_max_to_scan;
1351 	unsigned int s_mb_min_to_scan;
1352 	unsigned int s_mb_stats;
1353 	unsigned int s_mb_order2_reqs;
1354 	unsigned int s_mb_group_prealloc;
1355 	unsigned int s_max_dir_size_kb;
1356 	/* where last allocation was done - for stream allocation */
1357 	unsigned long s_mb_last_group;
1358 	unsigned long s_mb_last_start;
1359 
1360 	/* stats for buddy allocator */
1361 	atomic_t s_bal_reqs;	/* number of reqs with len > 1 */
1362 	atomic_t s_bal_success;	/* we found long enough chunks */
1363 	atomic_t s_bal_allocated;	/* in blocks */
1364 	atomic_t s_bal_ex_scanned;	/* total extents scanned */
1365 	atomic_t s_bal_goals;	/* goal hits */
1366 	atomic_t s_bal_breaks;	/* too long searches */
1367 	atomic_t s_bal_2orders;	/* 2^order hits */
1368 	spinlock_t s_bal_lock;
1369 	unsigned long s_mb_buddies_generated;
1370 	unsigned long long s_mb_generation_time;
1371 	atomic_t s_mb_lost_chunks;
1372 	atomic_t s_mb_preallocated;
1373 	atomic_t s_mb_discarded;
1374 	atomic_t s_lock_busy;
1375 
1376 	/* locality groups */
1377 	struct ext4_locality_group __percpu *s_locality_groups;
1378 
1379 	/* for write statistics */
1380 	unsigned long s_sectors_written_start;
1381 	u64 s_kbytes_written;
1382 
1383 	/* the size of zero-out chunk */
1384 	unsigned int s_extent_max_zeroout_kb;
1385 
1386 	unsigned int s_log_groups_per_flex;
1387 	struct flex_groups *s_flex_groups;
1388 	ext4_group_t s_flex_groups_allocated;
1389 
1390 	/* workqueue for reserved extent conversions (buffered io) */
1391 	struct workqueue_struct *rsv_conversion_wq;
1392 
1393 	/* timer for periodic error stats printing */
1394 	struct timer_list s_err_report;
1395 
1396 	/* Lazy inode table initialization info */
1397 	struct ext4_li_request *s_li_request;
1398 	/* Wait multiplier for lazy initialization thread */
1399 	unsigned int s_li_wait_mult;
1400 
1401 	/* Kernel thread for multiple mount protection */
1402 	struct task_struct *s_mmp_tsk;
1403 
1404 	/* record the last minlen when FITRIM is called. */
1405 	atomic_t s_last_trim_minblks;
1406 
1407 	/* Reference to checksum algorithm driver via cryptoapi */
1408 	struct crypto_shash *s_chksum_driver;
1409 
1410 	/* Precomputed FS UUID checksum for seeding other checksums */
1411 	__u32 s_csum_seed;
1412 
1413 	/* Reclaim extents from extent status tree */
1414 	struct shrinker s_es_shrinker;
1415 	struct list_head s_es_list;	/* List of inodes with reclaimable extents */
1416 	long s_es_nr_inode;
1417 	struct ext4_es_stats s_es_stats;
1418 	struct mb_cache *s_mb_cache;
1419 	spinlock_t s_es_lock ____cacheline_aligned_in_smp;
1420 
1421 	/* Ratelimit ext4 messages. */
1422 	struct ratelimit_state s_err_ratelimit_state;
1423 	struct ratelimit_state s_warning_ratelimit_state;
1424 	struct ratelimit_state s_msg_ratelimit_state;
1425 };
1426 
1427 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb)
1428 {
1429 	return sb->s_fs_info;
1430 }
1431 static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
1432 {
1433 	return container_of(inode, struct ext4_inode_info, vfs_inode);
1434 }
1435 
1436 static inline struct timespec ext4_current_time(struct inode *inode)
1437 {
1438 	return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ?
1439 		current_fs_time(inode->i_sb) : CURRENT_TIME_SEC;
1440 }
1441 
1442 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
1443 {
1444 	return ino == EXT4_ROOT_INO ||
1445 		ino == EXT4_USR_QUOTA_INO ||
1446 		ino == EXT4_GRP_QUOTA_INO ||
1447 		ino == EXT4_BOOT_LOADER_INO ||
1448 		ino == EXT4_JOURNAL_INO ||
1449 		ino == EXT4_RESIZE_INO ||
1450 		(ino >= EXT4_FIRST_INO(sb) &&
1451 		 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
1452 }
1453 
1454 static inline void ext4_set_io_unwritten_flag(struct inode *inode,
1455 					      struct ext4_io_end *io_end)
1456 {
1457 	if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) {
1458 		io_end->flag |= EXT4_IO_END_UNWRITTEN;
1459 		atomic_inc(&EXT4_I(inode)->i_unwritten);
1460 	}
1461 }
1462 
1463 static inline ext4_io_end_t *ext4_inode_aio(struct inode *inode)
1464 {
1465 	return inode->i_private;
1466 }
1467 
1468 static inline void ext4_inode_aio_set(struct inode *inode, ext4_io_end_t *io)
1469 {
1470 	inode->i_private = io;
1471 }
1472 
1473 /*
1474  * Inode dynamic state flags
1475  */
1476 enum {
1477 	EXT4_STATE_JDATA,		/* journaled data exists */
1478 	EXT4_STATE_NEW,			/* inode is newly created */
1479 	EXT4_STATE_XATTR,		/* has in-inode xattrs */
1480 	EXT4_STATE_NO_EXPAND,		/* No space for expansion */
1481 	EXT4_STATE_DA_ALLOC_CLOSE,	/* Alloc DA blks on close */
1482 	EXT4_STATE_EXT_MIGRATE,		/* Inode is migrating */
1483 	EXT4_STATE_DIO_UNWRITTEN,	/* need convert on dio done*/
1484 	EXT4_STATE_NEWENTRY,		/* File just added to dir */
1485 	EXT4_STATE_DIOREAD_LOCK,	/* Disable support for dio read
1486 					   nolocking */
1487 	EXT4_STATE_MAY_INLINE_DATA,	/* may have in-inode data */
1488 	EXT4_STATE_ORDERED_MODE,	/* data=ordered mode */
1489 	EXT4_STATE_EXT_PRECACHED,	/* extents have been precached */
1490 };
1491 
1492 #define EXT4_INODE_BIT_FNS(name, field, offset)				\
1493 static inline int ext4_test_inode_##name(struct inode *inode, int bit)	\
1494 {									\
1495 	return test_bit(bit + (offset), &EXT4_I(inode)->i_##field);	\
1496 }									\
1497 static inline void ext4_set_inode_##name(struct inode *inode, int bit)	\
1498 {									\
1499 	set_bit(bit + (offset), &EXT4_I(inode)->i_##field);		\
1500 }									\
1501 static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \
1502 {									\
1503 	clear_bit(bit + (offset), &EXT4_I(inode)->i_##field);		\
1504 }
1505 
1506 /* Add these declarations here only so that these functions can be
1507  * found by name.  Otherwise, they are very hard to locate. */
1508 static inline int ext4_test_inode_flag(struct inode *inode, int bit);
1509 static inline void ext4_set_inode_flag(struct inode *inode, int bit);
1510 static inline void ext4_clear_inode_flag(struct inode *inode, int bit);
1511 EXT4_INODE_BIT_FNS(flag, flags, 0)
1512 
1513 /* Add these declarations here only so that these functions can be
1514  * found by name.  Otherwise, they are very hard to locate. */
1515 static inline int ext4_test_inode_state(struct inode *inode, int bit);
1516 static inline void ext4_set_inode_state(struct inode *inode, int bit);
1517 static inline void ext4_clear_inode_state(struct inode *inode, int bit);
1518 #if (BITS_PER_LONG < 64)
1519 EXT4_INODE_BIT_FNS(state, state_flags, 0)
1520 
1521 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1522 {
1523 	(ei)->i_state_flags = 0;
1524 }
1525 #else
1526 EXT4_INODE_BIT_FNS(state, flags, 32)
1527 
1528 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1529 {
1530 	/* We depend on the fact that callers will set i_flags */
1531 }
1532 #endif
1533 #else
1534 /* Assume that user mode programs are passing in an ext4fs superblock, not
1535  * a kernel struct super_block.  This will allow us to call the feature-test
1536  * macros from user land. */
1537 #define EXT4_SB(sb)	(sb)
1538 #endif
1539 
1540 /*
1541  * Returns true if the inode is inode is encrypted
1542  */
1543 static inline int ext4_encrypted_inode(struct inode *inode)
1544 {
1545 #ifdef CONFIG_EXT4_FS_ENCRYPTION
1546 	return ext4_test_inode_flag(inode, EXT4_INODE_ENCRYPT);
1547 #else
1548 	return 0;
1549 #endif
1550 }
1551 
1552 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
1553 
1554 /*
1555  * Codes for operating systems
1556  */
1557 #define EXT4_OS_LINUX		0
1558 #define EXT4_OS_HURD		1
1559 #define EXT4_OS_MASIX		2
1560 #define EXT4_OS_FREEBSD		3
1561 #define EXT4_OS_LITES		4
1562 
1563 /*
1564  * Revision levels
1565  */
1566 #define EXT4_GOOD_OLD_REV	0	/* The good old (original) format */
1567 #define EXT4_DYNAMIC_REV	1	/* V2 format w/ dynamic inode sizes */
1568 
1569 #define EXT4_CURRENT_REV	EXT4_GOOD_OLD_REV
1570 #define EXT4_MAX_SUPP_REV	EXT4_DYNAMIC_REV
1571 
1572 #define EXT4_GOOD_OLD_INODE_SIZE 128
1573 
1574 /*
1575  * Feature set definitions
1576  */
1577 
1578 /* Use the ext4_{has,set,clear}_feature_* helpers; these will be removed */
1579 #define EXT4_HAS_COMPAT_FEATURE(sb,mask)			\
1580 	((EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask)) != 0)
1581 #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask)			\
1582 	((EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask)) != 0)
1583 #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask)			\
1584 	((EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask)) != 0)
1585 #define EXT4_SET_COMPAT_FEATURE(sb,mask)			\
1586 	EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
1587 #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask)			\
1588 	EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
1589 #define EXT4_SET_INCOMPAT_FEATURE(sb,mask)			\
1590 	EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
1591 #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask)			\
1592 	EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
1593 #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask)			\
1594 	EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
1595 #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask)			\
1596 	EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
1597 
1598 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC	0x0001
1599 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES	0x0002
1600 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL		0x0004
1601 #define EXT4_FEATURE_COMPAT_EXT_ATTR		0x0008
1602 #define EXT4_FEATURE_COMPAT_RESIZE_INODE	0x0010
1603 #define EXT4_FEATURE_COMPAT_DIR_INDEX		0x0020
1604 #define EXT4_FEATURE_COMPAT_SPARSE_SUPER2	0x0200
1605 
1606 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER	0x0001
1607 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE	0x0002
1608 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR	0x0004
1609 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE        0x0008
1610 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM		0x0010
1611 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK	0x0020
1612 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE	0x0040
1613 #define EXT4_FEATURE_RO_COMPAT_QUOTA		0x0100
1614 #define EXT4_FEATURE_RO_COMPAT_BIGALLOC		0x0200
1615 /*
1616  * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM).  When
1617  * METADATA_CSUM is set, group descriptor checksums use the same algorithm as
1618  * all other data structures' checksums.  However, the METADATA_CSUM and
1619  * GDT_CSUM bits are mutually exclusive.
1620  */
1621 #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM	0x0400
1622 #define EXT4_FEATURE_RO_COMPAT_READONLY		0x1000
1623 #define EXT4_FEATURE_RO_COMPAT_PROJECT		0x2000
1624 
1625 #define EXT4_FEATURE_INCOMPAT_COMPRESSION	0x0001
1626 #define EXT4_FEATURE_INCOMPAT_FILETYPE		0x0002
1627 #define EXT4_FEATURE_INCOMPAT_RECOVER		0x0004 /* Needs recovery */
1628 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV	0x0008 /* Journal device */
1629 #define EXT4_FEATURE_INCOMPAT_META_BG		0x0010
1630 #define EXT4_FEATURE_INCOMPAT_EXTENTS		0x0040 /* extents support */
1631 #define EXT4_FEATURE_INCOMPAT_64BIT		0x0080
1632 #define EXT4_FEATURE_INCOMPAT_MMP               0x0100
1633 #define EXT4_FEATURE_INCOMPAT_FLEX_BG		0x0200
1634 #define EXT4_FEATURE_INCOMPAT_EA_INODE		0x0400 /* EA in inode */
1635 #define EXT4_FEATURE_INCOMPAT_DIRDATA		0x1000 /* data in dirent */
1636 #define EXT4_FEATURE_INCOMPAT_CSUM_SEED		0x2000
1637 #define EXT4_FEATURE_INCOMPAT_LARGEDIR		0x4000 /* >2GB or 3-lvl htree */
1638 #define EXT4_FEATURE_INCOMPAT_INLINE_DATA	0x8000 /* data in inode */
1639 #define EXT4_FEATURE_INCOMPAT_ENCRYPT		0x10000
1640 
1641 #define EXT4_FEATURE_COMPAT_FUNCS(name, flagname) \
1642 static inline bool ext4_has_feature_##name(struct super_block *sb) \
1643 { \
1644 	return ((EXT4_SB(sb)->s_es->s_feature_compat & \
1645 		cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname)) != 0); \
1646 } \
1647 static inline void ext4_set_feature_##name(struct super_block *sb) \
1648 { \
1649 	EXT4_SB(sb)->s_es->s_feature_compat |= \
1650 		cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \
1651 } \
1652 static inline void ext4_clear_feature_##name(struct super_block *sb) \
1653 { \
1654 	EXT4_SB(sb)->s_es->s_feature_compat &= \
1655 		~cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \
1656 }
1657 
1658 #define EXT4_FEATURE_RO_COMPAT_FUNCS(name, flagname) \
1659 static inline bool ext4_has_feature_##name(struct super_block *sb) \
1660 { \
1661 	return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \
1662 		cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname)) != 0); \
1663 } \
1664 static inline void ext4_set_feature_##name(struct super_block *sb) \
1665 { \
1666 	EXT4_SB(sb)->s_es->s_feature_ro_compat |= \
1667 		cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \
1668 } \
1669 static inline void ext4_clear_feature_##name(struct super_block *sb) \
1670 { \
1671 	EXT4_SB(sb)->s_es->s_feature_ro_compat &= \
1672 		~cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \
1673 }
1674 
1675 #define EXT4_FEATURE_INCOMPAT_FUNCS(name, flagname) \
1676 static inline bool ext4_has_feature_##name(struct super_block *sb) \
1677 { \
1678 	return ((EXT4_SB(sb)->s_es->s_feature_incompat & \
1679 		cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname)) != 0); \
1680 } \
1681 static inline void ext4_set_feature_##name(struct super_block *sb) \
1682 { \
1683 	EXT4_SB(sb)->s_es->s_feature_incompat |= \
1684 		cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \
1685 } \
1686 static inline void ext4_clear_feature_##name(struct super_block *sb) \
1687 { \
1688 	EXT4_SB(sb)->s_es->s_feature_incompat &= \
1689 		~cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \
1690 }
1691 
1692 EXT4_FEATURE_COMPAT_FUNCS(dir_prealloc,		DIR_PREALLOC)
1693 EXT4_FEATURE_COMPAT_FUNCS(imagic_inodes,	IMAGIC_INODES)
1694 EXT4_FEATURE_COMPAT_FUNCS(journal,		HAS_JOURNAL)
1695 EXT4_FEATURE_COMPAT_FUNCS(xattr,		EXT_ATTR)
1696 EXT4_FEATURE_COMPAT_FUNCS(resize_inode,		RESIZE_INODE)
1697 EXT4_FEATURE_COMPAT_FUNCS(dir_index,		DIR_INDEX)
1698 EXT4_FEATURE_COMPAT_FUNCS(sparse_super2,	SPARSE_SUPER2)
1699 
1700 EXT4_FEATURE_RO_COMPAT_FUNCS(sparse_super,	SPARSE_SUPER)
1701 EXT4_FEATURE_RO_COMPAT_FUNCS(large_file,	LARGE_FILE)
1702 EXT4_FEATURE_RO_COMPAT_FUNCS(btree_dir,		BTREE_DIR)
1703 EXT4_FEATURE_RO_COMPAT_FUNCS(huge_file,		HUGE_FILE)
1704 EXT4_FEATURE_RO_COMPAT_FUNCS(gdt_csum,		GDT_CSUM)
1705 EXT4_FEATURE_RO_COMPAT_FUNCS(dir_nlink,		DIR_NLINK)
1706 EXT4_FEATURE_RO_COMPAT_FUNCS(extra_isize,	EXTRA_ISIZE)
1707 EXT4_FEATURE_RO_COMPAT_FUNCS(quota,		QUOTA)
1708 EXT4_FEATURE_RO_COMPAT_FUNCS(bigalloc,		BIGALLOC)
1709 EXT4_FEATURE_RO_COMPAT_FUNCS(metadata_csum,	METADATA_CSUM)
1710 EXT4_FEATURE_RO_COMPAT_FUNCS(readonly,		READONLY)
1711 EXT4_FEATURE_RO_COMPAT_FUNCS(project,		PROJECT)
1712 
1713 EXT4_FEATURE_INCOMPAT_FUNCS(compression,	COMPRESSION)
1714 EXT4_FEATURE_INCOMPAT_FUNCS(filetype,		FILETYPE)
1715 EXT4_FEATURE_INCOMPAT_FUNCS(journal_needs_recovery,	RECOVER)
1716 EXT4_FEATURE_INCOMPAT_FUNCS(journal_dev,	JOURNAL_DEV)
1717 EXT4_FEATURE_INCOMPAT_FUNCS(meta_bg,		META_BG)
1718 EXT4_FEATURE_INCOMPAT_FUNCS(extents,		EXTENTS)
1719 EXT4_FEATURE_INCOMPAT_FUNCS(64bit,		64BIT)
1720 EXT4_FEATURE_INCOMPAT_FUNCS(mmp,		MMP)
1721 EXT4_FEATURE_INCOMPAT_FUNCS(flex_bg,		FLEX_BG)
1722 EXT4_FEATURE_INCOMPAT_FUNCS(ea_inode,		EA_INODE)
1723 EXT4_FEATURE_INCOMPAT_FUNCS(dirdata,		DIRDATA)
1724 EXT4_FEATURE_INCOMPAT_FUNCS(csum_seed,		CSUM_SEED)
1725 EXT4_FEATURE_INCOMPAT_FUNCS(largedir,		LARGEDIR)
1726 EXT4_FEATURE_INCOMPAT_FUNCS(inline_data,	INLINE_DATA)
1727 EXT4_FEATURE_INCOMPAT_FUNCS(encrypt,		ENCRYPT)
1728 
1729 #define EXT2_FEATURE_COMPAT_SUPP	EXT4_FEATURE_COMPAT_EXT_ATTR
1730 #define EXT2_FEATURE_INCOMPAT_SUPP	(EXT4_FEATURE_INCOMPAT_FILETYPE| \
1731 					 EXT4_FEATURE_INCOMPAT_META_BG)
1732 #define EXT2_FEATURE_RO_COMPAT_SUPP	(EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1733 					 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1734 					 EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
1735 
1736 #define EXT3_FEATURE_COMPAT_SUPP	EXT4_FEATURE_COMPAT_EXT_ATTR
1737 #define EXT3_FEATURE_INCOMPAT_SUPP	(EXT4_FEATURE_INCOMPAT_FILETYPE| \
1738 					 EXT4_FEATURE_INCOMPAT_RECOVER| \
1739 					 EXT4_FEATURE_INCOMPAT_META_BG)
1740 #define EXT3_FEATURE_RO_COMPAT_SUPP	(EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1741 					 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1742 					 EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
1743 
1744 #define EXT4_FEATURE_COMPAT_SUPP	EXT4_FEATURE_COMPAT_EXT_ATTR
1745 #define EXT4_FEATURE_INCOMPAT_SUPP	(EXT4_FEATURE_INCOMPAT_FILETYPE| \
1746 					 EXT4_FEATURE_INCOMPAT_RECOVER| \
1747 					 EXT4_FEATURE_INCOMPAT_META_BG| \
1748 					 EXT4_FEATURE_INCOMPAT_EXTENTS| \
1749 					 EXT4_FEATURE_INCOMPAT_64BIT| \
1750 					 EXT4_FEATURE_INCOMPAT_FLEX_BG| \
1751 					 EXT4_FEATURE_INCOMPAT_MMP | \
1752 					 EXT4_FEATURE_INCOMPAT_INLINE_DATA | \
1753 					 EXT4_FEATURE_INCOMPAT_ENCRYPT | \
1754 					 EXT4_FEATURE_INCOMPAT_CSUM_SEED)
1755 #define EXT4_FEATURE_RO_COMPAT_SUPP	(EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1756 					 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1757 					 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
1758 					 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
1759 					 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
1760 					 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
1761 					 EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\
1762 					 EXT4_FEATURE_RO_COMPAT_BIGALLOC |\
1763 					 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\
1764 					 EXT4_FEATURE_RO_COMPAT_QUOTA)
1765 
1766 #define EXTN_FEATURE_FUNCS(ver) \
1767 static inline bool ext4_has_unknown_ext##ver##_compat_features(struct super_block *sb) \
1768 { \
1769 	return ((EXT4_SB(sb)->s_es->s_feature_compat & \
1770 		cpu_to_le32(~EXT##ver##_FEATURE_COMPAT_SUPP)) != 0); \
1771 } \
1772 static inline bool ext4_has_unknown_ext##ver##_ro_compat_features(struct super_block *sb) \
1773 { \
1774 	return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \
1775 		cpu_to_le32(~EXT##ver##_FEATURE_RO_COMPAT_SUPP)) != 0); \
1776 } \
1777 static inline bool ext4_has_unknown_ext##ver##_incompat_features(struct super_block *sb) \
1778 { \
1779 	return ((EXT4_SB(sb)->s_es->s_feature_incompat & \
1780 		cpu_to_le32(~EXT##ver##_FEATURE_INCOMPAT_SUPP)) != 0); \
1781 }
1782 
1783 EXTN_FEATURE_FUNCS(2)
1784 EXTN_FEATURE_FUNCS(3)
1785 EXTN_FEATURE_FUNCS(4)
1786 
1787 static inline bool ext4_has_compat_features(struct super_block *sb)
1788 {
1789 	return (EXT4_SB(sb)->s_es->s_feature_compat != 0);
1790 }
1791 static inline bool ext4_has_ro_compat_features(struct super_block *sb)
1792 {
1793 	return (EXT4_SB(sb)->s_es->s_feature_ro_compat != 0);
1794 }
1795 static inline bool ext4_has_incompat_features(struct super_block *sb)
1796 {
1797 	return (EXT4_SB(sb)->s_es->s_feature_incompat != 0);
1798 }
1799 
1800 /*
1801  * Default values for user and/or group using reserved blocks
1802  */
1803 #define	EXT4_DEF_RESUID		0
1804 #define	EXT4_DEF_RESGID		0
1805 
1806 #define EXT4_DEF_INODE_READAHEAD_BLKS	32
1807 
1808 /*
1809  * Default mount options
1810  */
1811 #define EXT4_DEFM_DEBUG		0x0001
1812 #define EXT4_DEFM_BSDGROUPS	0x0002
1813 #define EXT4_DEFM_XATTR_USER	0x0004
1814 #define EXT4_DEFM_ACL		0x0008
1815 #define EXT4_DEFM_UID16		0x0010
1816 #define EXT4_DEFM_JMODE		0x0060
1817 #define EXT4_DEFM_JMODE_DATA	0x0020
1818 #define EXT4_DEFM_JMODE_ORDERED	0x0040
1819 #define EXT4_DEFM_JMODE_WBACK	0x0060
1820 #define EXT4_DEFM_NOBARRIER	0x0100
1821 #define EXT4_DEFM_BLOCK_VALIDITY 0x0200
1822 #define EXT4_DEFM_DISCARD	0x0400
1823 #define EXT4_DEFM_NODELALLOC	0x0800
1824 
1825 /*
1826  * Default journal batch times
1827  */
1828 #define EXT4_DEF_MIN_BATCH_TIME	0
1829 #define EXT4_DEF_MAX_BATCH_TIME	15000 /* 15ms */
1830 
1831 /*
1832  * Minimum number of groups in a flexgroup before we separate out
1833  * directories into the first block group of a flexgroup
1834  */
1835 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME	4
1836 
1837 /*
1838  * Structure of a directory entry
1839  */
1840 #define EXT4_NAME_LEN 255
1841 
1842 struct ext4_dir_entry {
1843 	__le32	inode;			/* Inode number */
1844 	__le16	rec_len;		/* Directory entry length */
1845 	__le16	name_len;		/* Name length */
1846 	char	name[EXT4_NAME_LEN];	/* File name */
1847 };
1848 
1849 /*
1850  * The new version of the directory entry.  Since EXT4 structures are
1851  * stored in intel byte order, and the name_len field could never be
1852  * bigger than 255 chars, it's safe to reclaim the extra byte for the
1853  * file_type field.
1854  */
1855 struct ext4_dir_entry_2 {
1856 	__le32	inode;			/* Inode number */
1857 	__le16	rec_len;		/* Directory entry length */
1858 	__u8	name_len;		/* Name length */
1859 	__u8	file_type;
1860 	char	name[EXT4_NAME_LEN];	/* File name */
1861 };
1862 
1863 /*
1864  * This is a bogus directory entry at the end of each leaf block that
1865  * records checksums.
1866  */
1867 struct ext4_dir_entry_tail {
1868 	__le32	det_reserved_zero1;	/* Pretend to be unused */
1869 	__le16	det_rec_len;		/* 12 */
1870 	__u8	det_reserved_zero2;	/* Zero name length */
1871 	__u8	det_reserved_ft;	/* 0xDE, fake file type */
1872 	__le32	det_checksum;		/* crc32c(uuid+inum+dirblock) */
1873 };
1874 
1875 #define EXT4_DIRENT_TAIL(block, blocksize) \
1876 	((struct ext4_dir_entry_tail *)(((void *)(block)) + \
1877 					((blocksize) - \
1878 					 sizeof(struct ext4_dir_entry_tail))))
1879 
1880 /*
1881  * Ext4 directory file types.  Only the low 3 bits are used.  The
1882  * other bits are reserved for now.
1883  */
1884 #define EXT4_FT_UNKNOWN		0
1885 #define EXT4_FT_REG_FILE	1
1886 #define EXT4_FT_DIR		2
1887 #define EXT4_FT_CHRDEV		3
1888 #define EXT4_FT_BLKDEV		4
1889 #define EXT4_FT_FIFO		5
1890 #define EXT4_FT_SOCK		6
1891 #define EXT4_FT_SYMLINK		7
1892 
1893 #define EXT4_FT_MAX		8
1894 
1895 #define EXT4_FT_DIR_CSUM	0xDE
1896 
1897 /*
1898  * EXT4_DIR_PAD defines the directory entries boundaries
1899  *
1900  * NOTE: It must be a multiple of 4
1901  */
1902 #define EXT4_DIR_PAD			4
1903 #define EXT4_DIR_ROUND			(EXT4_DIR_PAD - 1)
1904 #define EXT4_DIR_REC_LEN(name_len)	(((name_len) + 8 + EXT4_DIR_ROUND) & \
1905 					 ~EXT4_DIR_ROUND)
1906 #define EXT4_MAX_REC_LEN		((1<<16)-1)
1907 
1908 /*
1909  * If we ever get support for fs block sizes > page_size, we'll need
1910  * to remove the #if statements in the next two functions...
1911  */
1912 static inline unsigned int
1913 ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize)
1914 {
1915 	unsigned len = le16_to_cpu(dlen);
1916 
1917 #if (PAGE_CACHE_SIZE >= 65536)
1918 	if (len == EXT4_MAX_REC_LEN || len == 0)
1919 		return blocksize;
1920 	return (len & 65532) | ((len & 3) << 16);
1921 #else
1922 	return len;
1923 #endif
1924 }
1925 
1926 static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize)
1927 {
1928 	if ((len > blocksize) || (blocksize > (1 << 18)) || (len & 3))
1929 		BUG();
1930 #if (PAGE_CACHE_SIZE >= 65536)
1931 	if (len < 65536)
1932 		return cpu_to_le16(len);
1933 	if (len == blocksize) {
1934 		if (blocksize == 65536)
1935 			return cpu_to_le16(EXT4_MAX_REC_LEN);
1936 		else
1937 			return cpu_to_le16(0);
1938 	}
1939 	return cpu_to_le16((len & 65532) | ((len >> 16) & 3));
1940 #else
1941 	return cpu_to_le16(len);
1942 #endif
1943 }
1944 
1945 /*
1946  * Hash Tree Directory indexing
1947  * (c) Daniel Phillips, 2001
1948  */
1949 
1950 #define is_dx(dir) (ext4_has_feature_dir_index((dir)->i_sb) && \
1951 		    ext4_test_inode_flag((dir), EXT4_INODE_INDEX))
1952 #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX)
1953 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
1954 
1955 /* Legal values for the dx_root hash_version field: */
1956 
1957 #define DX_HASH_LEGACY		0
1958 #define DX_HASH_HALF_MD4	1
1959 #define DX_HASH_TEA		2
1960 #define DX_HASH_LEGACY_UNSIGNED	3
1961 #define DX_HASH_HALF_MD4_UNSIGNED	4
1962 #define DX_HASH_TEA_UNSIGNED		5
1963 
1964 static inline u32 ext4_chksum(struct ext4_sb_info *sbi, u32 crc,
1965 			      const void *address, unsigned int length)
1966 {
1967 	struct {
1968 		struct shash_desc shash;
1969 		char ctx[4];
1970 	} desc;
1971 	int err;
1972 
1973 	BUG_ON(crypto_shash_descsize(sbi->s_chksum_driver)!=sizeof(desc.ctx));
1974 
1975 	desc.shash.tfm = sbi->s_chksum_driver;
1976 	desc.shash.flags = 0;
1977 	*(u32 *)desc.ctx = crc;
1978 
1979 	err = crypto_shash_update(&desc.shash, address, length);
1980 	BUG_ON(err);
1981 
1982 	return *(u32 *)desc.ctx;
1983 }
1984 
1985 #ifdef __KERNEL__
1986 
1987 /* hash info structure used by the directory hash */
1988 struct dx_hash_info
1989 {
1990 	u32		hash;
1991 	u32		minor_hash;
1992 	int		hash_version;
1993 	u32		*seed;
1994 };
1995 
1996 
1997 /* 32 and 64 bit signed EOF for dx directories */
1998 #define EXT4_HTREE_EOF_32BIT   ((1UL  << (32 - 1)) - 1)
1999 #define EXT4_HTREE_EOF_64BIT   ((1ULL << (64 - 1)) - 1)
2000 
2001 
2002 /*
2003  * Control parameters used by ext4_htree_next_block
2004  */
2005 #define HASH_NB_ALWAYS		1
2006 
2007 struct ext4_filename {
2008 	const struct qstr *usr_fname;
2009 	struct ext4_str disk_name;
2010 	struct dx_hash_info hinfo;
2011 #ifdef CONFIG_EXT4_FS_ENCRYPTION
2012 	struct ext4_str crypto_buf;
2013 #endif
2014 };
2015 
2016 #define fname_name(p) ((p)->disk_name.name)
2017 #define fname_len(p)  ((p)->disk_name.len)
2018 
2019 /*
2020  * Describe an inode's exact location on disk and in memory
2021  */
2022 struct ext4_iloc
2023 {
2024 	struct buffer_head *bh;
2025 	unsigned long offset;
2026 	ext4_group_t block_group;
2027 };
2028 
2029 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
2030 {
2031 	return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
2032 }
2033 
2034 /*
2035  * This structure is stuffed into the struct file's private_data field
2036  * for directories.  It is where we put information so that we can do
2037  * readdir operations in hash tree order.
2038  */
2039 struct dir_private_info {
2040 	struct rb_root	root;
2041 	struct rb_node	*curr_node;
2042 	struct fname	*extra_fname;
2043 	loff_t		last_pos;
2044 	__u32		curr_hash;
2045 	__u32		curr_minor_hash;
2046 	__u32		next_hash;
2047 };
2048 
2049 /* calculate the first block number of the group */
2050 static inline ext4_fsblk_t
2051 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no)
2052 {
2053 	return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
2054 		le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
2055 }
2056 
2057 /*
2058  * Special error return code only used by dx_probe() and its callers.
2059  */
2060 #define ERR_BAD_DX_DIR	(-(MAX_ERRNO - 1))
2061 
2062 /*
2063  * Timeout and state flag for lazy initialization inode thread.
2064  */
2065 #define EXT4_DEF_LI_WAIT_MULT			10
2066 #define EXT4_DEF_LI_MAX_START_DELAY		5
2067 #define EXT4_LAZYINIT_QUIT			0x0001
2068 #define EXT4_LAZYINIT_RUNNING			0x0002
2069 
2070 /*
2071  * Lazy inode table initialization info
2072  */
2073 struct ext4_lazy_init {
2074 	unsigned long		li_state;
2075 	struct list_head	li_request_list;
2076 	struct mutex		li_list_mtx;
2077 };
2078 
2079 struct ext4_li_request {
2080 	struct super_block	*lr_super;
2081 	struct ext4_sb_info	*lr_sbi;
2082 	ext4_group_t		lr_next_group;
2083 	struct list_head	lr_request;
2084 	unsigned long		lr_next_sched;
2085 	unsigned long		lr_timeout;
2086 };
2087 
2088 struct ext4_features {
2089 	struct kobject f_kobj;
2090 	struct completion f_kobj_unregister;
2091 };
2092 
2093 /*
2094  * This structure will be used for multiple mount protection. It will be
2095  * written into the block number saved in the s_mmp_block field in the
2096  * superblock. Programs that check MMP should assume that if
2097  * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe
2098  * to use the filesystem, regardless of how old the timestamp is.
2099  */
2100 #define EXT4_MMP_MAGIC     0x004D4D50U /* ASCII for MMP */
2101 #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */
2102 #define EXT4_MMP_SEQ_FSCK  0xE24D4D50U /* mmp_seq value when being fscked */
2103 #define EXT4_MMP_SEQ_MAX   0xE24D4D4FU /* maximum valid mmp_seq value */
2104 
2105 struct mmp_struct {
2106 	__le32	mmp_magic;		/* Magic number for MMP */
2107 	__le32	mmp_seq;		/* Sequence no. updated periodically */
2108 
2109 	/*
2110 	 * mmp_time, mmp_nodename & mmp_bdevname are only used for information
2111 	 * purposes and do not affect the correctness of the algorithm
2112 	 */
2113 	__le64	mmp_time;		/* Time last updated */
2114 	char	mmp_nodename[64];	/* Node which last updated MMP block */
2115 	char	mmp_bdevname[32];	/* Bdev which last updated MMP block */
2116 
2117 	/*
2118 	 * mmp_check_interval is used to verify if the MMP block has been
2119 	 * updated on the block device. The value is updated based on the
2120 	 * maximum time to write the MMP block during an update cycle.
2121 	 */
2122 	__le16	mmp_check_interval;
2123 
2124 	__le16	mmp_pad1;
2125 	__le32	mmp_pad2[226];
2126 	__le32	mmp_checksum;		/* crc32c(uuid+mmp_block) */
2127 };
2128 
2129 /* arguments passed to the mmp thread */
2130 struct mmpd_data {
2131 	struct buffer_head *bh; /* bh from initial read_mmp_block() */
2132 	struct super_block *sb;  /* super block of the fs */
2133 };
2134 
2135 /*
2136  * Check interval multiplier
2137  * The MMP block is written every update interval and initially checked every
2138  * update interval x the multiplier (the value is then adapted based on the
2139  * write latency). The reason is that writes can be delayed under load and we
2140  * don't want readers to incorrectly assume that the filesystem is no longer
2141  * in use.
2142  */
2143 #define EXT4_MMP_CHECK_MULT		2UL
2144 
2145 /*
2146  * Minimum interval for MMP checking in seconds.
2147  */
2148 #define EXT4_MMP_MIN_CHECK_INTERVAL	5UL
2149 
2150 /*
2151  * Maximum interval for MMP checking in seconds.
2152  */
2153 #define EXT4_MMP_MAX_CHECK_INTERVAL	300UL
2154 
2155 /*
2156  * Function prototypes
2157  */
2158 
2159 /*
2160  * Ok, these declarations are also in <linux/kernel.h> but none of the
2161  * ext4 source programs needs to include it so they are duplicated here.
2162  */
2163 # define NORET_TYPE	/**/
2164 # define ATTRIB_NORET	__attribute__((noreturn))
2165 # define NORET_AND	noreturn,
2166 
2167 /* bitmap.c */
2168 extern unsigned int ext4_count_free(char *bitmap, unsigned numchars);
2169 void ext4_inode_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
2170 				struct ext4_group_desc *gdp,
2171 				struct buffer_head *bh, int sz);
2172 int ext4_inode_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
2173 				  struct ext4_group_desc *gdp,
2174 				  struct buffer_head *bh, int sz);
2175 void ext4_block_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
2176 				struct ext4_group_desc *gdp,
2177 				struct buffer_head *bh);
2178 int ext4_block_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
2179 				  struct ext4_group_desc *gdp,
2180 				  struct buffer_head *bh);
2181 
2182 /* balloc.c */
2183 extern void ext4_get_group_no_and_offset(struct super_block *sb,
2184 					 ext4_fsblk_t blocknr,
2185 					 ext4_group_t *blockgrpp,
2186 					 ext4_grpblk_t *offsetp);
2187 extern ext4_group_t ext4_get_group_number(struct super_block *sb,
2188 					  ext4_fsblk_t block);
2189 
2190 extern unsigned int ext4_block_group(struct super_block *sb,
2191 			ext4_fsblk_t blocknr);
2192 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb,
2193 			ext4_fsblk_t blocknr);
2194 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group);
2195 extern unsigned long ext4_bg_num_gdb(struct super_block *sb,
2196 			ext4_group_t group);
2197 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,
2198 					 ext4_fsblk_t goal,
2199 					 unsigned int flags,
2200 					 unsigned long *count,
2201 					 int *errp);
2202 extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi,
2203 				    s64 nclusters, unsigned int flags);
2204 extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *);
2205 extern void ext4_check_blocks_bitmap(struct super_block *);
2206 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
2207 						    ext4_group_t block_group,
2208 						    struct buffer_head ** bh);
2209 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
2210 
2211 extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb,
2212 						ext4_group_t block_group);
2213 extern int ext4_wait_block_bitmap(struct super_block *sb,
2214 				  ext4_group_t block_group,
2215 				  struct buffer_head *bh);
2216 extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb,
2217 						  ext4_group_t block_group);
2218 extern unsigned ext4_free_clusters_after_init(struct super_block *sb,
2219 					      ext4_group_t block_group,
2220 					      struct ext4_group_desc *gdp);
2221 ext4_fsblk_t ext4_inode_to_goal_block(struct inode *);
2222 
2223 /* crypto_policy.c */
2224 int ext4_is_child_context_consistent_with_parent(struct inode *parent,
2225 						 struct inode *child);
2226 int ext4_inherit_context(struct inode *parent, struct inode *child);
2227 void ext4_to_hex(char *dst, char *src, size_t src_size);
2228 int ext4_process_policy(const struct ext4_encryption_policy *policy,
2229 			struct inode *inode);
2230 int ext4_get_policy(struct inode *inode,
2231 		    struct ext4_encryption_policy *policy);
2232 
2233 /* crypto.c */
2234 extern struct kmem_cache *ext4_crypt_info_cachep;
2235 bool ext4_valid_contents_enc_mode(uint32_t mode);
2236 uint32_t ext4_validate_encryption_key_size(uint32_t mode, uint32_t size);
2237 extern struct workqueue_struct *ext4_read_workqueue;
2238 struct ext4_crypto_ctx *ext4_get_crypto_ctx(struct inode *inode);
2239 void ext4_release_crypto_ctx(struct ext4_crypto_ctx *ctx);
2240 void ext4_restore_control_page(struct page *data_page);
2241 struct page *ext4_encrypt(struct inode *inode,
2242 			  struct page *plaintext_page);
2243 int ext4_decrypt(struct page *page);
2244 int ext4_encrypted_zeroout(struct inode *inode, ext4_lblk_t lblk,
2245 			   ext4_fsblk_t pblk, ext4_lblk_t len);
2246 
2247 #ifdef CONFIG_EXT4_FS_ENCRYPTION
2248 int ext4_init_crypto(void);
2249 void ext4_exit_crypto(void);
2250 static inline int ext4_sb_has_crypto(struct super_block *sb)
2251 {
2252 	return ext4_has_feature_encrypt(sb);
2253 }
2254 #else
2255 static inline int ext4_init_crypto(void) { return 0; }
2256 static inline void ext4_exit_crypto(void) { }
2257 static inline int ext4_sb_has_crypto(struct super_block *sb)
2258 {
2259 	return 0;
2260 }
2261 #endif
2262 
2263 /* crypto_fname.c */
2264 bool ext4_valid_filenames_enc_mode(uint32_t mode);
2265 u32 ext4_fname_crypto_round_up(u32 size, u32 blksize);
2266 unsigned ext4_fname_encrypted_size(struct inode *inode, u32 ilen);
2267 int ext4_fname_crypto_alloc_buffer(struct inode *inode,
2268 				   u32 ilen, struct ext4_str *crypto_str);
2269 int _ext4_fname_disk_to_usr(struct inode *inode,
2270 			    struct dx_hash_info *hinfo,
2271 			    const struct ext4_str *iname,
2272 			    struct ext4_str *oname);
2273 int ext4_fname_disk_to_usr(struct inode *inode,
2274 			   struct dx_hash_info *hinfo,
2275 			   const struct ext4_dir_entry_2 *de,
2276 			   struct ext4_str *oname);
2277 int ext4_fname_usr_to_disk(struct inode *inode,
2278 			   const struct qstr *iname,
2279 			   struct ext4_str *oname);
2280 #ifdef CONFIG_EXT4_FS_ENCRYPTION
2281 void ext4_fname_crypto_free_buffer(struct ext4_str *crypto_str);
2282 int ext4_fname_setup_filename(struct inode *dir, const struct qstr *iname,
2283 			      int lookup, struct ext4_filename *fname);
2284 void ext4_fname_free_filename(struct ext4_filename *fname);
2285 #else
2286 static inline
2287 int ext4_setup_fname_crypto(struct inode *inode)
2288 {
2289 	return 0;
2290 }
2291 static inline void ext4_fname_crypto_free_buffer(struct ext4_str *p) { }
2292 static inline int ext4_fname_setup_filename(struct inode *dir,
2293 				     const struct qstr *iname,
2294 				     int lookup, struct ext4_filename *fname)
2295 {
2296 	fname->usr_fname = iname;
2297 	fname->disk_name.name = (unsigned char *) iname->name;
2298 	fname->disk_name.len = iname->len;
2299 	return 0;
2300 }
2301 static inline void ext4_fname_free_filename(struct ext4_filename *fname) { }
2302 #endif
2303 
2304 
2305 /* crypto_key.c */
2306 void ext4_free_crypt_info(struct ext4_crypt_info *ci);
2307 void ext4_free_encryption_info(struct inode *inode, struct ext4_crypt_info *ci);
2308 int _ext4_get_encryption_info(struct inode *inode);
2309 
2310 #ifdef CONFIG_EXT4_FS_ENCRYPTION
2311 int ext4_has_encryption_key(struct inode *inode);
2312 
2313 static inline int ext4_get_encryption_info(struct inode *inode)
2314 {
2315 	struct ext4_crypt_info *ci = EXT4_I(inode)->i_crypt_info;
2316 
2317 	if (!ci ||
2318 	    (ci->ci_keyring_key &&
2319 	     (ci->ci_keyring_key->flags & ((1 << KEY_FLAG_INVALIDATED) |
2320 					   (1 << KEY_FLAG_REVOKED) |
2321 					   (1 << KEY_FLAG_DEAD)))))
2322 		return _ext4_get_encryption_info(inode);
2323 	return 0;
2324 }
2325 
2326 static inline struct ext4_crypt_info *ext4_encryption_info(struct inode *inode)
2327 {
2328 	return EXT4_I(inode)->i_crypt_info;
2329 }
2330 
2331 #else
2332 static inline int ext4_has_encryption_key(struct inode *inode)
2333 {
2334 	return 0;
2335 }
2336 static inline int ext4_get_encryption_info(struct inode *inode)
2337 {
2338 	return 0;
2339 }
2340 static inline struct ext4_crypt_info *ext4_encryption_info(struct inode *inode)
2341 {
2342 	return NULL;
2343 }
2344 #endif
2345 
2346 
2347 /* dir.c */
2348 extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *,
2349 				  struct file *,
2350 				  struct ext4_dir_entry_2 *,
2351 				  struct buffer_head *, char *, int,
2352 				  unsigned int);
2353 #define ext4_check_dir_entry(dir, filp, de, bh, buf, size, offset)	\
2354 	unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \
2355 					(de), (bh), (buf), (size), (offset)))
2356 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
2357 				__u32 minor_hash,
2358 				struct ext4_dir_entry_2 *dirent,
2359 				struct ext4_str *ent_name);
2360 extern void ext4_htree_free_dir_info(struct dir_private_info *p);
2361 extern int ext4_find_dest_de(struct inode *dir, struct inode *inode,
2362 			     struct buffer_head *bh,
2363 			     void *buf, int buf_size,
2364 			     struct ext4_filename *fname,
2365 			     struct ext4_dir_entry_2 **dest_de);
2366 int ext4_insert_dentry(struct inode *dir,
2367 		       struct inode *inode,
2368 		       struct ext4_dir_entry_2 *de,
2369 		       int buf_size,
2370 		       struct ext4_filename *fname);
2371 static inline void ext4_update_dx_flag(struct inode *inode)
2372 {
2373 	if (!ext4_has_feature_dir_index(inode->i_sb))
2374 		ext4_clear_inode_flag(inode, EXT4_INODE_INDEX);
2375 }
2376 static unsigned char ext4_filetype_table[] = {
2377 	DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK
2378 };
2379 
2380 static inline  unsigned char get_dtype(struct super_block *sb, int filetype)
2381 {
2382 	if (!ext4_has_feature_filetype(sb) || filetype >= EXT4_FT_MAX)
2383 		return DT_UNKNOWN;
2384 
2385 	return ext4_filetype_table[filetype];
2386 }
2387 extern int ext4_check_all_de(struct inode *dir, struct buffer_head *bh,
2388 			     void *buf, int buf_size);
2389 
2390 /* fsync.c */
2391 extern int ext4_sync_file(struct file *, loff_t, loff_t, int);
2392 
2393 /* hash.c */
2394 extern int ext4fs_dirhash(const char *name, int len, struct
2395 			  dx_hash_info *hinfo);
2396 
2397 /* ialloc.c */
2398 extern struct inode *__ext4_new_inode(handle_t *, struct inode *, umode_t,
2399 				      const struct qstr *qstr, __u32 goal,
2400 				      uid_t *owner, int handle_type,
2401 				      unsigned int line_no, int nblocks);
2402 
2403 #define ext4_new_inode(handle, dir, mode, qstr, goal, owner) \
2404 	__ext4_new_inode((handle), (dir), (mode), (qstr), (goal), (owner), \
2405 			 0, 0, 0)
2406 #define ext4_new_inode_start_handle(dir, mode, qstr, goal, owner, \
2407 				    type, nblocks)		    \
2408 	__ext4_new_inode(NULL, (dir), (mode), (qstr), (goal), (owner), \
2409 			 (type), __LINE__, (nblocks))
2410 
2411 
2412 extern void ext4_free_inode(handle_t *, struct inode *);
2413 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long);
2414 extern unsigned long ext4_count_free_inodes(struct super_block *);
2415 extern unsigned long ext4_count_dirs(struct super_block *);
2416 extern void ext4_check_inodes_bitmap(struct super_block *);
2417 extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap);
2418 extern int ext4_init_inode_table(struct super_block *sb,
2419 				 ext4_group_t group, int barrier);
2420 extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate);
2421 
2422 /* mballoc.c */
2423 extern const struct file_operations ext4_seq_mb_groups_fops;
2424 extern long ext4_mb_stats;
2425 extern long ext4_mb_max_to_scan;
2426 extern int ext4_mb_init(struct super_block *);
2427 extern int ext4_mb_release(struct super_block *);
2428 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *,
2429 				struct ext4_allocation_request *, int *);
2430 extern int ext4_mb_reserve_blocks(struct super_block *, int);
2431 extern void ext4_discard_preallocations(struct inode *);
2432 extern int __init ext4_init_mballoc(void);
2433 extern void ext4_exit_mballoc(void);
2434 extern void ext4_free_blocks(handle_t *handle, struct inode *inode,
2435 			     struct buffer_head *bh, ext4_fsblk_t block,
2436 			     unsigned long count, int flags);
2437 extern int ext4_mb_alloc_groupinfo(struct super_block *sb,
2438 				   ext4_group_t ngroups);
2439 extern int ext4_mb_add_groupinfo(struct super_block *sb,
2440 		ext4_group_t i, struct ext4_group_desc *desc);
2441 extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb,
2442 				ext4_fsblk_t block, unsigned long count);
2443 extern int ext4_trim_fs(struct super_block *, struct fstrim_range *);
2444 
2445 /* inode.c */
2446 int ext4_inode_is_fast_symlink(struct inode *inode);
2447 struct buffer_head *ext4_getblk(handle_t *, struct inode *, ext4_lblk_t, int);
2448 struct buffer_head *ext4_bread(handle_t *, struct inode *, ext4_lblk_t, int);
2449 int ext4_get_block_write(struct inode *inode, sector_t iblock,
2450 			 struct buffer_head *bh_result, int create);
2451 int ext4_get_block_dax(struct inode *inode, sector_t iblock,
2452 			 struct buffer_head *bh_result, int create);
2453 int ext4_get_block(struct inode *inode, sector_t iblock,
2454 				struct buffer_head *bh_result, int create);
2455 int ext4_da_get_block_prep(struct inode *inode, sector_t iblock,
2456 			   struct buffer_head *bh, int create);
2457 int ext4_walk_page_buffers(handle_t *handle,
2458 			   struct buffer_head *head,
2459 			   unsigned from,
2460 			   unsigned to,
2461 			   int *partial,
2462 			   int (*fn)(handle_t *handle,
2463 				     struct buffer_head *bh));
2464 int do_journal_get_write_access(handle_t *handle,
2465 				struct buffer_head *bh);
2466 #define FALL_BACK_TO_NONDELALLOC 1
2467 #define CONVERT_INLINE_DATA	 2
2468 
2469 extern struct inode *ext4_iget(struct super_block *, unsigned long);
2470 extern struct inode *ext4_iget_normal(struct super_block *, unsigned long);
2471 extern int  ext4_write_inode(struct inode *, struct writeback_control *);
2472 extern int  ext4_setattr(struct dentry *, struct iattr *);
2473 extern int  ext4_getattr(struct vfsmount *mnt, struct dentry *dentry,
2474 				struct kstat *stat);
2475 extern void ext4_evict_inode(struct inode *);
2476 extern void ext4_clear_inode(struct inode *);
2477 extern int  ext4_sync_inode(handle_t *, struct inode *);
2478 extern void ext4_dirty_inode(struct inode *, int);
2479 extern int ext4_change_inode_journal_flag(struct inode *, int);
2480 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
2481 extern int ext4_inode_attach_jinode(struct inode *inode);
2482 extern int ext4_can_truncate(struct inode *inode);
2483 extern void ext4_truncate(struct inode *);
2484 extern int ext4_punch_hole(struct inode *inode, loff_t offset, loff_t length);
2485 extern int ext4_truncate_restart_trans(handle_t *, struct inode *, int nblocks);
2486 extern void ext4_set_inode_flags(struct inode *);
2487 extern void ext4_get_inode_flags(struct ext4_inode_info *);
2488 extern int ext4_alloc_da_blocks(struct inode *inode);
2489 extern void ext4_set_aops(struct inode *inode);
2490 extern int ext4_writepage_trans_blocks(struct inode *);
2491 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks);
2492 extern int ext4_zero_partial_blocks(handle_t *handle, struct inode *inode,
2493 			     loff_t lstart, loff_t lend);
2494 extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf);
2495 extern int ext4_filemap_fault(struct vm_area_struct *vma, struct vm_fault *vmf);
2496 extern qsize_t *ext4_get_reserved_space(struct inode *inode);
2497 extern void ext4_da_update_reserve_space(struct inode *inode,
2498 					int used, int quota_claim);
2499 extern int ext4_issue_zeroout(struct inode *inode, ext4_lblk_t lblk,
2500 			      ext4_fsblk_t pblk, ext4_lblk_t len);
2501 
2502 /* indirect.c */
2503 extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode,
2504 				struct ext4_map_blocks *map, int flags);
2505 extern ssize_t ext4_ind_direct_IO(struct kiocb *iocb, struct iov_iter *iter,
2506 				  loff_t offset);
2507 extern int ext4_ind_calc_metadata_amount(struct inode *inode, sector_t lblock);
2508 extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks);
2509 extern void ext4_ind_truncate(handle_t *, struct inode *inode);
2510 extern int ext4_ind_remove_space(handle_t *handle, struct inode *inode,
2511 				 ext4_lblk_t start, ext4_lblk_t end);
2512 
2513 /* ioctl.c */
2514 extern long ext4_ioctl(struct file *, unsigned int, unsigned long);
2515 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long);
2516 
2517 /* migrate.c */
2518 extern int ext4_ext_migrate(struct inode *);
2519 extern int ext4_ind_migrate(struct inode *inode);
2520 
2521 /* namei.c */
2522 extern int ext4_dirent_csum_verify(struct inode *inode,
2523 				   struct ext4_dir_entry *dirent);
2524 extern int ext4_orphan_add(handle_t *, struct inode *);
2525 extern int ext4_orphan_del(handle_t *, struct inode *);
2526 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
2527 				__u32 start_minor_hash, __u32 *next_hash);
2528 extern int ext4_search_dir(struct buffer_head *bh,
2529 			   char *search_buf,
2530 			   int buf_size,
2531 			   struct inode *dir,
2532 			   struct ext4_filename *fname,
2533 			   const struct qstr *d_name,
2534 			   unsigned int offset,
2535 			   struct ext4_dir_entry_2 **res_dir);
2536 extern int ext4_generic_delete_entry(handle_t *handle,
2537 				     struct inode *dir,
2538 				     struct ext4_dir_entry_2 *de_del,
2539 				     struct buffer_head *bh,
2540 				     void *entry_buf,
2541 				     int buf_size,
2542 				     int csum_size);
2543 extern int ext4_empty_dir(struct inode *inode);
2544 
2545 /* resize.c */
2546 extern int ext4_group_add(struct super_block *sb,
2547 				struct ext4_new_group_data *input);
2548 extern int ext4_group_extend(struct super_block *sb,
2549 				struct ext4_super_block *es,
2550 				ext4_fsblk_t n_blocks_count);
2551 extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count);
2552 
2553 /* super.c */
2554 extern int ext4_seq_options_show(struct seq_file *seq, void *offset);
2555 extern int ext4_calculate_overhead(struct super_block *sb);
2556 extern void ext4_superblock_csum_set(struct super_block *sb);
2557 extern void *ext4_kvmalloc(size_t size, gfp_t flags);
2558 extern void *ext4_kvzalloc(size_t size, gfp_t flags);
2559 extern int ext4_alloc_flex_bg_array(struct super_block *sb,
2560 				    ext4_group_t ngroup);
2561 extern const char *ext4_decode_error(struct super_block *sb, int errno,
2562 				     char nbuf[16]);
2563 
2564 extern __printf(4, 5)
2565 void __ext4_error(struct super_block *, const char *, unsigned int,
2566 		  const char *, ...);
2567 extern __printf(5, 6)
2568 void __ext4_error_inode(struct inode *, const char *, unsigned int, ext4_fsblk_t,
2569 		      const char *, ...);
2570 extern __printf(5, 6)
2571 void __ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t,
2572 		     const char *, ...);
2573 extern void __ext4_std_error(struct super_block *, const char *,
2574 			     unsigned int, int);
2575 extern __printf(4, 5)
2576 void __ext4_abort(struct super_block *, const char *, unsigned int,
2577 		  const char *, ...);
2578 extern __printf(4, 5)
2579 void __ext4_warning(struct super_block *, const char *, unsigned int,
2580 		    const char *, ...);
2581 extern __printf(4, 5)
2582 void __ext4_warning_inode(const struct inode *inode, const char *function,
2583 			  unsigned int line, const char *fmt, ...);
2584 extern __printf(3, 4)
2585 void __ext4_msg(struct super_block *, const char *, const char *, ...);
2586 extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp,
2587 			   const char *, unsigned int, const char *);
2588 extern __printf(7, 8)
2589 void __ext4_grp_locked_error(const char *, unsigned int,
2590 			     struct super_block *, ext4_group_t,
2591 			     unsigned long, ext4_fsblk_t,
2592 			     const char *, ...);
2593 
2594 #define EXT4_ERROR_INODE(inode, fmt, a...) \
2595 	ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a)
2596 
2597 #define EXT4_ERROR_INODE_BLOCK(inode, block, fmt, a...)			\
2598 	ext4_error_inode((inode), __func__, __LINE__, (block), (fmt), ## a)
2599 
2600 #define EXT4_ERROR_FILE(file, block, fmt, a...)				\
2601 	ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a)
2602 
2603 #ifdef CONFIG_PRINTK
2604 
2605 #define ext4_error_inode(inode, func, line, block, fmt, ...)		\
2606 	__ext4_error_inode(inode, func, line, block, fmt, ##__VA_ARGS__)
2607 #define ext4_error_file(file, func, line, block, fmt, ...)		\
2608 	__ext4_error_file(file, func, line, block, fmt, ##__VA_ARGS__)
2609 #define ext4_error(sb, fmt, ...)					\
2610 	__ext4_error(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
2611 #define ext4_abort(sb, fmt, ...)					\
2612 	__ext4_abort(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
2613 #define ext4_warning(sb, fmt, ...)					\
2614 	__ext4_warning(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
2615 #define ext4_warning_inode(inode, fmt, ...)				\
2616 	__ext4_warning_inode(inode, __func__, __LINE__, fmt, ##__VA_ARGS__)
2617 #define ext4_msg(sb, level, fmt, ...)				\
2618 	__ext4_msg(sb, level, fmt, ##__VA_ARGS__)
2619 #define dump_mmp_msg(sb, mmp, msg)					\
2620 	__dump_mmp_msg(sb, mmp, __func__, __LINE__, msg)
2621 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...)		\
2622 	__ext4_grp_locked_error(__func__, __LINE__, sb, grp, ino, block, \
2623 				fmt, ##__VA_ARGS__)
2624 
2625 #else
2626 
2627 #define ext4_error_inode(inode, func, line, block, fmt, ...)		\
2628 do {									\
2629 	no_printk(fmt, ##__VA_ARGS__);					\
2630 	__ext4_error_inode(inode, "", 0, block, " ");			\
2631 } while (0)
2632 #define ext4_error_file(file, func, line, block, fmt, ...)		\
2633 do {									\
2634 	no_printk(fmt, ##__VA_ARGS__);					\
2635 	__ext4_error_file(file, "", 0, block, " ");			\
2636 } while (0)
2637 #define ext4_error(sb, fmt, ...)					\
2638 do {									\
2639 	no_printk(fmt, ##__VA_ARGS__);					\
2640 	__ext4_error(sb, "", 0, " ");					\
2641 } while (0)
2642 #define ext4_abort(sb, fmt, ...)					\
2643 do {									\
2644 	no_printk(fmt, ##__VA_ARGS__);					\
2645 	__ext4_abort(sb, "", 0, " ");					\
2646 } while (0)
2647 #define ext4_warning(sb, fmt, ...)					\
2648 do {									\
2649 	no_printk(fmt, ##__VA_ARGS__);					\
2650 	__ext4_warning(sb, "", 0, " ");					\
2651 } while (0)
2652 #define ext4_warning_inode(inode, fmt, ...)				\
2653 do {									\
2654 	no_printk(fmt, ##__VA_ARGS__);					\
2655 	__ext4_warning_inode(inode, "", 0, " ");			\
2656 } while (0)
2657 #define ext4_msg(sb, level, fmt, ...)					\
2658 do {									\
2659 	no_printk(fmt, ##__VA_ARGS__);					\
2660 	__ext4_msg(sb, "", " ");					\
2661 } while (0)
2662 #define dump_mmp_msg(sb, mmp, msg)					\
2663 	__dump_mmp_msg(sb, mmp, "", 0, "")
2664 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...)		\
2665 do {									\
2666 	no_printk(fmt, ##__VA_ARGS__);				\
2667 	__ext4_grp_locked_error("", 0, sb, grp, ino, block, " ");	\
2668 } while (0)
2669 
2670 #endif
2671 
2672 extern void ext4_update_dynamic_rev(struct super_block *sb);
2673 extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb,
2674 					__u32 compat);
2675 extern int ext4_update_rocompat_feature(handle_t *handle,
2676 					struct super_block *sb,	__u32 rocompat);
2677 extern int ext4_update_incompat_feature(handle_t *handle,
2678 					struct super_block *sb,	__u32 incompat);
2679 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
2680 				      struct ext4_group_desc *bg);
2681 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
2682 				      struct ext4_group_desc *bg);
2683 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
2684 				     struct ext4_group_desc *bg);
2685 extern __u32 ext4_free_group_clusters(struct super_block *sb,
2686 				      struct ext4_group_desc *bg);
2687 extern __u32 ext4_free_inodes_count(struct super_block *sb,
2688 				 struct ext4_group_desc *bg);
2689 extern __u32 ext4_used_dirs_count(struct super_block *sb,
2690 				struct ext4_group_desc *bg);
2691 extern __u32 ext4_itable_unused_count(struct super_block *sb,
2692 				   struct ext4_group_desc *bg);
2693 extern void ext4_block_bitmap_set(struct super_block *sb,
2694 				  struct ext4_group_desc *bg, ext4_fsblk_t blk);
2695 extern void ext4_inode_bitmap_set(struct super_block *sb,
2696 				  struct ext4_group_desc *bg, ext4_fsblk_t blk);
2697 extern void ext4_inode_table_set(struct super_block *sb,
2698 				 struct ext4_group_desc *bg, ext4_fsblk_t blk);
2699 extern void ext4_free_group_clusters_set(struct super_block *sb,
2700 					 struct ext4_group_desc *bg,
2701 					 __u32 count);
2702 extern void ext4_free_inodes_set(struct super_block *sb,
2703 				struct ext4_group_desc *bg, __u32 count);
2704 extern void ext4_used_dirs_set(struct super_block *sb,
2705 				struct ext4_group_desc *bg, __u32 count);
2706 extern void ext4_itable_unused_set(struct super_block *sb,
2707 				   struct ext4_group_desc *bg, __u32 count);
2708 extern int ext4_group_desc_csum_verify(struct super_block *sb, __u32 group,
2709 				       struct ext4_group_desc *gdp);
2710 extern void ext4_group_desc_csum_set(struct super_block *sb, __u32 group,
2711 				     struct ext4_group_desc *gdp);
2712 extern int ext4_register_li_request(struct super_block *sb,
2713 				    ext4_group_t first_not_zeroed);
2714 
2715 static inline int ext4_has_group_desc_csum(struct super_block *sb)
2716 {
2717 	return ext4_has_feature_gdt_csum(sb) ||
2718 	       EXT4_SB(sb)->s_chksum_driver != NULL;
2719 }
2720 
2721 static inline int ext4_has_metadata_csum(struct super_block *sb)
2722 {
2723 	WARN_ON_ONCE(ext4_has_feature_metadata_csum(sb) &&
2724 		     !EXT4_SB(sb)->s_chksum_driver);
2725 
2726 	return (EXT4_SB(sb)->s_chksum_driver != NULL);
2727 }
2728 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
2729 {
2730 	return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) |
2731 		le32_to_cpu(es->s_blocks_count_lo);
2732 }
2733 
2734 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
2735 {
2736 	return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) |
2737 		le32_to_cpu(es->s_r_blocks_count_lo);
2738 }
2739 
2740 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
2741 {
2742 	return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) |
2743 		le32_to_cpu(es->s_free_blocks_count_lo);
2744 }
2745 
2746 static inline void ext4_blocks_count_set(struct ext4_super_block *es,
2747 					 ext4_fsblk_t blk)
2748 {
2749 	es->s_blocks_count_lo = cpu_to_le32((u32)blk);
2750 	es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
2751 }
2752 
2753 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
2754 					      ext4_fsblk_t blk)
2755 {
2756 	es->s_free_blocks_count_lo = cpu_to_le32((u32)blk);
2757 	es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
2758 }
2759 
2760 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
2761 					   ext4_fsblk_t blk)
2762 {
2763 	es->s_r_blocks_count_lo = cpu_to_le32((u32)blk);
2764 	es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
2765 }
2766 
2767 static inline loff_t ext4_isize(struct ext4_inode *raw_inode)
2768 {
2769 	if (S_ISREG(le16_to_cpu(raw_inode->i_mode)))
2770 		return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) |
2771 			le32_to_cpu(raw_inode->i_size_lo);
2772 	else
2773 		return (loff_t) le32_to_cpu(raw_inode->i_size_lo);
2774 }
2775 
2776 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size)
2777 {
2778 	raw_inode->i_size_lo = cpu_to_le32(i_size);
2779 	raw_inode->i_size_high = cpu_to_le32(i_size >> 32);
2780 }
2781 
2782 static inline
2783 struct ext4_group_info *ext4_get_group_info(struct super_block *sb,
2784 					    ext4_group_t group)
2785 {
2786 	 struct ext4_group_info ***grp_info;
2787 	 long indexv, indexh;
2788 	 BUG_ON(group >= EXT4_SB(sb)->s_groups_count);
2789 	 grp_info = EXT4_SB(sb)->s_group_info;
2790 	 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb));
2791 	 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1);
2792 	 return grp_info[indexv][indexh];
2793 }
2794 
2795 /*
2796  * Reading s_groups_count requires using smp_rmb() afterwards.  See
2797  * the locking protocol documented in the comments of ext4_group_add()
2798  * in resize.c
2799  */
2800 static inline ext4_group_t ext4_get_groups_count(struct super_block *sb)
2801 {
2802 	ext4_group_t	ngroups = EXT4_SB(sb)->s_groups_count;
2803 
2804 	smp_rmb();
2805 	return ngroups;
2806 }
2807 
2808 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi,
2809 					     ext4_group_t block_group)
2810 {
2811 	return block_group >> sbi->s_log_groups_per_flex;
2812 }
2813 
2814 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi)
2815 {
2816 	return 1 << sbi->s_log_groups_per_flex;
2817 }
2818 
2819 #define ext4_std_error(sb, errno)				\
2820 do {								\
2821 	if ((errno))						\
2822 		__ext4_std_error((sb), __func__, __LINE__, (errno));	\
2823 } while (0)
2824 
2825 #ifdef CONFIG_SMP
2826 /* Each CPU can accumulate percpu_counter_batch clusters in their local
2827  * counters. So we need to make sure we have free clusters more
2828  * than percpu_counter_batch  * nr_cpu_ids. Also add a window of 4 times.
2829  */
2830 #define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids))
2831 #else
2832 #define EXT4_FREECLUSTERS_WATERMARK 0
2833 #endif
2834 
2835 /* Update i_disksize. Requires i_mutex to avoid races with truncate */
2836 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize)
2837 {
2838 	WARN_ON_ONCE(S_ISREG(inode->i_mode) &&
2839 		     !mutex_is_locked(&inode->i_mutex));
2840 	down_write(&EXT4_I(inode)->i_data_sem);
2841 	if (newsize > EXT4_I(inode)->i_disksize)
2842 		EXT4_I(inode)->i_disksize = newsize;
2843 	up_write(&EXT4_I(inode)->i_data_sem);
2844 }
2845 
2846 /* Update i_size, i_disksize. Requires i_mutex to avoid races with truncate */
2847 static inline int ext4_update_inode_size(struct inode *inode, loff_t newsize)
2848 {
2849 	int changed = 0;
2850 
2851 	if (newsize > inode->i_size) {
2852 		i_size_write(inode, newsize);
2853 		changed = 1;
2854 	}
2855 	if (newsize > EXT4_I(inode)->i_disksize) {
2856 		ext4_update_i_disksize(inode, newsize);
2857 		changed |= 2;
2858 	}
2859 	return changed;
2860 }
2861 
2862 int ext4_update_disksize_before_punch(struct inode *inode, loff_t offset,
2863 				      loff_t len);
2864 
2865 struct ext4_group_info {
2866 	unsigned long   bb_state;
2867 	struct rb_root  bb_free_root;
2868 	ext4_grpblk_t	bb_first_free;	/* first free block */
2869 	ext4_grpblk_t	bb_free;	/* total free blocks */
2870 	ext4_grpblk_t	bb_fragments;	/* nr of freespace fragments */
2871 	ext4_grpblk_t	bb_largest_free_order;/* order of largest frag in BG */
2872 	struct          list_head bb_prealloc_list;
2873 #ifdef DOUBLE_CHECK
2874 	void            *bb_bitmap;
2875 #endif
2876 	struct rw_semaphore alloc_sem;
2877 	ext4_grpblk_t	bb_counters[];	/* Nr of free power-of-two-block
2878 					 * regions, index is order.
2879 					 * bb_counters[3] = 5 means
2880 					 * 5 free 8-block regions. */
2881 };
2882 
2883 #define EXT4_GROUP_INFO_NEED_INIT_BIT		0
2884 #define EXT4_GROUP_INFO_WAS_TRIMMED_BIT		1
2885 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT	2
2886 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT	3
2887 
2888 #define EXT4_MB_GRP_NEED_INIT(grp)	\
2889 	(test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state)))
2890 #define EXT4_MB_GRP_BBITMAP_CORRUPT(grp)	\
2891 	(test_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &((grp)->bb_state)))
2892 #define EXT4_MB_GRP_IBITMAP_CORRUPT(grp)	\
2893 	(test_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &((grp)->bb_state)))
2894 
2895 #define EXT4_MB_GRP_WAS_TRIMMED(grp)	\
2896 	(test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2897 #define EXT4_MB_GRP_SET_TRIMMED(grp)	\
2898 	(set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2899 #define EXT4_MB_GRP_CLEAR_TRIMMED(grp)	\
2900 	(clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2901 
2902 #define EXT4_MAX_CONTENTION		8
2903 #define EXT4_CONTENTION_THRESHOLD	2
2904 
2905 static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb,
2906 					      ext4_group_t group)
2907 {
2908 	return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group);
2909 }
2910 
2911 /*
2912  * Returns true if the filesystem is busy enough that attempts to
2913  * access the block group locks has run into contention.
2914  */
2915 static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi)
2916 {
2917 	return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD);
2918 }
2919 
2920 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group)
2921 {
2922 	spinlock_t *lock = ext4_group_lock_ptr(sb, group);
2923 	if (spin_trylock(lock))
2924 		/*
2925 		 * We're able to grab the lock right away, so drop the
2926 		 * lock contention counter.
2927 		 */
2928 		atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0);
2929 	else {
2930 		/*
2931 		 * The lock is busy, so bump the contention counter,
2932 		 * and then wait on the spin lock.
2933 		 */
2934 		atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1,
2935 				  EXT4_MAX_CONTENTION);
2936 		spin_lock(lock);
2937 	}
2938 }
2939 
2940 static inline void ext4_unlock_group(struct super_block *sb,
2941 					ext4_group_t group)
2942 {
2943 	spin_unlock(ext4_group_lock_ptr(sb, group));
2944 }
2945 
2946 /*
2947  * Block validity checking
2948  */
2949 #define ext4_check_indirect_blockref(inode, bh)				\
2950 	ext4_check_blockref(__func__, __LINE__, inode,			\
2951 			    (__le32 *)(bh)->b_data,			\
2952 			    EXT4_ADDR_PER_BLOCK((inode)->i_sb))
2953 
2954 #define ext4_ind_check_inode(inode)					\
2955 	ext4_check_blockref(__func__, __LINE__, inode,			\
2956 			    EXT4_I(inode)->i_data,			\
2957 			    EXT4_NDIR_BLOCKS)
2958 
2959 /*
2960  * Inodes and files operations
2961  */
2962 
2963 /* dir.c */
2964 extern const struct file_operations ext4_dir_operations;
2965 
2966 /* file.c */
2967 extern const struct inode_operations ext4_file_inode_operations;
2968 extern const struct file_operations ext4_file_operations;
2969 extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin);
2970 
2971 /* inline.c */
2972 extern int ext4_get_max_inline_size(struct inode *inode);
2973 extern int ext4_find_inline_data_nolock(struct inode *inode);
2974 extern int ext4_init_inline_data(handle_t *handle, struct inode *inode,
2975 				 unsigned int len);
2976 extern int ext4_destroy_inline_data(handle_t *handle, struct inode *inode);
2977 
2978 extern int ext4_readpage_inline(struct inode *inode, struct page *page);
2979 extern int ext4_try_to_write_inline_data(struct address_space *mapping,
2980 					 struct inode *inode,
2981 					 loff_t pos, unsigned len,
2982 					 unsigned flags,
2983 					 struct page **pagep);
2984 extern int ext4_write_inline_data_end(struct inode *inode,
2985 				      loff_t pos, unsigned len,
2986 				      unsigned copied,
2987 				      struct page *page);
2988 extern struct buffer_head *
2989 ext4_journalled_write_inline_data(struct inode *inode,
2990 				  unsigned len,
2991 				  struct page *page);
2992 extern int ext4_da_write_inline_data_begin(struct address_space *mapping,
2993 					   struct inode *inode,
2994 					   loff_t pos, unsigned len,
2995 					   unsigned flags,
2996 					   struct page **pagep,
2997 					   void **fsdata);
2998 extern int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos,
2999 					 unsigned len, unsigned copied,
3000 					 struct page *page);
3001 extern int ext4_try_add_inline_entry(handle_t *handle,
3002 				     struct ext4_filename *fname,
3003 				     struct dentry *dentry,
3004 				     struct inode *inode);
3005 extern int ext4_try_create_inline_dir(handle_t *handle,
3006 				      struct inode *parent,
3007 				      struct inode *inode);
3008 extern int ext4_read_inline_dir(struct file *filp,
3009 				struct dir_context *ctx,
3010 				int *has_inline_data);
3011 extern int htree_inlinedir_to_tree(struct file *dir_file,
3012 				   struct inode *dir, ext4_lblk_t block,
3013 				   struct dx_hash_info *hinfo,
3014 				   __u32 start_hash, __u32 start_minor_hash,
3015 				   int *has_inline_data);
3016 extern struct buffer_head *ext4_find_inline_entry(struct inode *dir,
3017 					struct ext4_filename *fname,
3018 					const struct qstr *d_name,
3019 					struct ext4_dir_entry_2 **res_dir,
3020 					int *has_inline_data);
3021 extern int ext4_delete_inline_entry(handle_t *handle,
3022 				    struct inode *dir,
3023 				    struct ext4_dir_entry_2 *de_del,
3024 				    struct buffer_head *bh,
3025 				    int *has_inline_data);
3026 extern int empty_inline_dir(struct inode *dir, int *has_inline_data);
3027 extern struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
3028 					struct ext4_dir_entry_2 **parent_de,
3029 					int *retval);
3030 extern int ext4_inline_data_fiemap(struct inode *inode,
3031 				   struct fiemap_extent_info *fieinfo,
3032 				   int *has_inline, __u64 start, __u64 len);
3033 extern int ext4_try_to_evict_inline_data(handle_t *handle,
3034 					 struct inode *inode,
3035 					 int needed);
3036 extern void ext4_inline_data_truncate(struct inode *inode, int *has_inline);
3037 
3038 extern int ext4_convert_inline_data(struct inode *inode);
3039 
3040 static inline int ext4_has_inline_data(struct inode *inode)
3041 {
3042 	return ext4_test_inode_flag(inode, EXT4_INODE_INLINE_DATA) &&
3043 	       EXT4_I(inode)->i_inline_off;
3044 }
3045 
3046 /* namei.c */
3047 extern const struct inode_operations ext4_dir_inode_operations;
3048 extern const struct inode_operations ext4_special_inode_operations;
3049 extern struct dentry *ext4_get_parent(struct dentry *child);
3050 extern struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode,
3051 				 struct ext4_dir_entry_2 *de,
3052 				 int blocksize, int csum_size,
3053 				 unsigned int parent_ino, int dotdot_real_len);
3054 extern void initialize_dirent_tail(struct ext4_dir_entry_tail *t,
3055 				   unsigned int blocksize);
3056 extern int ext4_handle_dirty_dirent_node(handle_t *handle,
3057 					 struct inode *inode,
3058 					 struct buffer_head *bh);
3059 #define S_SHIFT 12
3060 static unsigned char ext4_type_by_mode[S_IFMT >> S_SHIFT] = {
3061 	[S_IFREG >> S_SHIFT]	= EXT4_FT_REG_FILE,
3062 	[S_IFDIR >> S_SHIFT]	= EXT4_FT_DIR,
3063 	[S_IFCHR >> S_SHIFT]	= EXT4_FT_CHRDEV,
3064 	[S_IFBLK >> S_SHIFT]	= EXT4_FT_BLKDEV,
3065 	[S_IFIFO >> S_SHIFT]	= EXT4_FT_FIFO,
3066 	[S_IFSOCK >> S_SHIFT]	= EXT4_FT_SOCK,
3067 	[S_IFLNK >> S_SHIFT]	= EXT4_FT_SYMLINK,
3068 };
3069 
3070 static inline void ext4_set_de_type(struct super_block *sb,
3071 				struct ext4_dir_entry_2 *de,
3072 				umode_t mode) {
3073 	if (ext4_has_feature_filetype(sb))
3074 		de->file_type = ext4_type_by_mode[(mode & S_IFMT)>>S_SHIFT];
3075 }
3076 
3077 /* readpages.c */
3078 extern int ext4_mpage_readpages(struct address_space *mapping,
3079 				struct list_head *pages, struct page *page,
3080 				unsigned nr_pages);
3081 
3082 /* symlink.c */
3083 extern const struct inode_operations ext4_encrypted_symlink_inode_operations;
3084 extern const struct inode_operations ext4_symlink_inode_operations;
3085 extern const struct inode_operations ext4_fast_symlink_inode_operations;
3086 
3087 /* sysfs.c */
3088 extern int ext4_register_sysfs(struct super_block *sb);
3089 extern void ext4_unregister_sysfs(struct super_block *sb);
3090 extern int __init ext4_init_sysfs(void);
3091 extern void ext4_exit_sysfs(void);
3092 
3093 /* block_validity */
3094 extern void ext4_release_system_zone(struct super_block *sb);
3095 extern int ext4_setup_system_zone(struct super_block *sb);
3096 extern int __init ext4_init_system_zone(void);
3097 extern void ext4_exit_system_zone(void);
3098 extern int ext4_data_block_valid(struct ext4_sb_info *sbi,
3099 				 ext4_fsblk_t start_blk,
3100 				 unsigned int count);
3101 extern int ext4_check_blockref(const char *, unsigned int,
3102 			       struct inode *, __le32 *, unsigned int);
3103 
3104 /* extents.c */
3105 struct ext4_ext_path;
3106 struct ext4_extent;
3107 
3108 /*
3109  * Maximum number of logical blocks in a file; ext4_extent's ee_block is
3110  * __le32.
3111  */
3112 #define EXT_MAX_BLOCKS	0xffffffff
3113 
3114 extern int ext4_ext_tree_init(handle_t *handle, struct inode *);
3115 extern int ext4_ext_writepage_trans_blocks(struct inode *, int);
3116 extern int ext4_ext_index_trans_blocks(struct inode *inode, int extents);
3117 extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
3118 			       struct ext4_map_blocks *map, int flags);
3119 extern void ext4_ext_truncate(handle_t *, struct inode *);
3120 extern int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start,
3121 				 ext4_lblk_t end);
3122 extern void ext4_ext_init(struct super_block *);
3123 extern void ext4_ext_release(struct super_block *);
3124 extern long ext4_fallocate(struct file *file, int mode, loff_t offset,
3125 			  loff_t len);
3126 extern int ext4_convert_unwritten_extents(handle_t *handle, struct inode *inode,
3127 					  loff_t offset, ssize_t len);
3128 extern int ext4_map_blocks(handle_t *handle, struct inode *inode,
3129 			   struct ext4_map_blocks *map, int flags);
3130 extern int ext4_ext_calc_metadata_amount(struct inode *inode,
3131 					 ext4_lblk_t lblocks);
3132 extern int ext4_ext_calc_credits_for_single_extent(struct inode *inode,
3133 						   int num,
3134 						   struct ext4_ext_path *path);
3135 extern int ext4_can_extents_be_merged(struct inode *inode,
3136 				      struct ext4_extent *ex1,
3137 				      struct ext4_extent *ex2);
3138 extern int ext4_ext_insert_extent(handle_t *, struct inode *,
3139 				  struct ext4_ext_path **,
3140 				  struct ext4_extent *, int);
3141 extern struct ext4_ext_path *ext4_find_extent(struct inode *, ext4_lblk_t,
3142 					      struct ext4_ext_path **,
3143 					      int flags);
3144 extern void ext4_ext_drop_refs(struct ext4_ext_path *);
3145 extern int ext4_ext_check_inode(struct inode *inode);
3146 extern int ext4_find_delalloc_range(struct inode *inode,
3147 				    ext4_lblk_t lblk_start,
3148 				    ext4_lblk_t lblk_end);
3149 extern int ext4_find_delalloc_cluster(struct inode *inode, ext4_lblk_t lblk);
3150 extern ext4_lblk_t ext4_ext_next_allocated_block(struct ext4_ext_path *path);
3151 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
3152 			__u64 start, __u64 len);
3153 extern int ext4_ext_precache(struct inode *inode);
3154 extern int ext4_collapse_range(struct inode *inode, loff_t offset, loff_t len);
3155 extern int ext4_insert_range(struct inode *inode, loff_t offset, loff_t len);
3156 extern int ext4_swap_extents(handle_t *handle, struct inode *inode1,
3157 				struct inode *inode2, ext4_lblk_t lblk1,
3158 			     ext4_lblk_t lblk2,  ext4_lblk_t count,
3159 			     int mark_unwritten,int *err);
3160 
3161 /* move_extent.c */
3162 extern void ext4_double_down_write_data_sem(struct inode *first,
3163 					    struct inode *second);
3164 extern void ext4_double_up_write_data_sem(struct inode *orig_inode,
3165 					  struct inode *donor_inode);
3166 extern int ext4_move_extents(struct file *o_filp, struct file *d_filp,
3167 			     __u64 start_orig, __u64 start_donor,
3168 			     __u64 len, __u64 *moved_len);
3169 
3170 /* page-io.c */
3171 extern int __init ext4_init_pageio(void);
3172 extern void ext4_exit_pageio(void);
3173 extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags);
3174 extern ext4_io_end_t *ext4_get_io_end(ext4_io_end_t *io_end);
3175 extern int ext4_put_io_end(ext4_io_end_t *io_end);
3176 extern void ext4_put_io_end_defer(ext4_io_end_t *io_end);
3177 extern void ext4_io_submit_init(struct ext4_io_submit *io,
3178 				struct writeback_control *wbc);
3179 extern void ext4_end_io_rsv_work(struct work_struct *work);
3180 extern void ext4_io_submit(struct ext4_io_submit *io);
3181 extern int ext4_bio_write_page(struct ext4_io_submit *io,
3182 			       struct page *page,
3183 			       int len,
3184 			       struct writeback_control *wbc,
3185 			       bool keep_towrite);
3186 
3187 /* mmp.c */
3188 extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t);
3189 
3190 /*
3191  * Add new method to test whether block and inode bitmaps are properly
3192  * initialized. With uninit_bg reading the block from disk is not enough
3193  * to mark the bitmap uptodate. We need to also zero-out the bitmap
3194  */
3195 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart
3196 
3197 static inline int bitmap_uptodate(struct buffer_head *bh)
3198 {
3199 	return (buffer_uptodate(bh) &&
3200 			test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state));
3201 }
3202 static inline void set_bitmap_uptodate(struct buffer_head *bh)
3203 {
3204 	set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state);
3205 }
3206 
3207 /*
3208  * Disable DIO read nolock optimization, so new dioreaders will be forced
3209  * to grab i_mutex
3210  */
3211 static inline void ext4_inode_block_unlocked_dio(struct inode *inode)
3212 {
3213 	ext4_set_inode_state(inode, EXT4_STATE_DIOREAD_LOCK);
3214 	smp_mb();
3215 }
3216 static inline void ext4_inode_resume_unlocked_dio(struct inode *inode)
3217 {
3218 	smp_mb();
3219 	ext4_clear_inode_state(inode, EXT4_STATE_DIOREAD_LOCK);
3220 }
3221 
3222 #define in_range(b, first, len)	((b) >= (first) && (b) <= (first) + (len) - 1)
3223 
3224 /* For ioend & aio unwritten conversion wait queues */
3225 #define EXT4_WQ_HASH_SZ		37
3226 #define ext4_ioend_wq(v)   (&ext4__ioend_wq[((unsigned long)(v)) %\
3227 					    EXT4_WQ_HASH_SZ])
3228 #define ext4_aio_mutex(v)  (&ext4__aio_mutex[((unsigned long)(v)) %\
3229 					     EXT4_WQ_HASH_SZ])
3230 extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
3231 extern struct mutex ext4__aio_mutex[EXT4_WQ_HASH_SZ];
3232 
3233 #define EXT4_RESIZING	0
3234 extern int ext4_resize_begin(struct super_block *sb);
3235 extern void ext4_resize_end(struct super_block *sb);
3236 
3237 #endif	/* __KERNEL__ */
3238 
3239 #define EFSBADCRC	EBADMSG		/* Bad CRC detected */
3240 #define EFSCORRUPTED	EUCLEAN		/* Filesystem is corrupted */
3241 
3242 #endif	/* _EXT4_H */
3243