xref: /linux/fs/ext4/ext4.h (revision 75305275a721d33ae9abfaeed2817cec8b2fee9a)
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/wait.h>
30 #include <linux/blockgroup_lock.h>
31 #include <linux/percpu_counter.h>
32 #include <linux/ratelimit.h>
33 #include <crypto/hash.h>
34 #include <linux/falloc.h>
35 #ifdef __KERNEL__
36 #include <linux/compat.h>
37 #endif
38 
39 /*
40  * The fourth extended filesystem constants/structures
41  */
42 
43 /*
44  * Define EXT4FS_DEBUG to produce debug messages
45  */
46 #undef EXT4FS_DEBUG
47 
48 /*
49  * Debug code
50  */
51 #ifdef EXT4FS_DEBUG
52 #define ext4_debug(f, a...)						\
53 	do {								\
54 		printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:",	\
55 			__FILE__, __LINE__, __func__);			\
56 		printk(KERN_DEBUG f, ## a);				\
57 	} while (0)
58 #else
59 #define ext4_debug(fmt, ...)	no_printk(fmt, ##__VA_ARGS__)
60 #endif
61 
62 /*
63  * Turn on EXT_DEBUG to get lots of info about extents operations.
64  */
65 #define EXT_DEBUG__
66 #ifdef EXT_DEBUG
67 #define ext_debug(fmt, ...)	printk(fmt, ##__VA_ARGS__)
68 #else
69 #define ext_debug(fmt, ...)	no_printk(fmt, ##__VA_ARGS__)
70 #endif
71 
72 /* data type for block offset of block group */
73 typedef int ext4_grpblk_t;
74 
75 /* data type for filesystem-wide blocks number */
76 typedef unsigned long long ext4_fsblk_t;
77 
78 /* data type for file logical block number */
79 typedef __u32 ext4_lblk_t;
80 
81 /* data type for block group number */
82 typedef unsigned int ext4_group_t;
83 
84 enum SHIFT_DIRECTION {
85 	SHIFT_LEFT = 0,
86 	SHIFT_RIGHT,
87 };
88 
89 /*
90  * Flags used in mballoc's allocation_context flags field.
91  *
92  * Also used to show what's going on for debugging purposes when the
93  * flag field is exported via the traceport interface
94  */
95 
96 /* prefer goal again. length */
97 #define EXT4_MB_HINT_MERGE		0x0001
98 /* blocks already reserved */
99 #define EXT4_MB_HINT_RESERVED		0x0002
100 /* metadata is being allocated */
101 #define EXT4_MB_HINT_METADATA		0x0004
102 /* first blocks in the file */
103 #define EXT4_MB_HINT_FIRST		0x0008
104 /* search for the best chunk */
105 #define EXT4_MB_HINT_BEST		0x0010
106 /* data is being allocated */
107 #define EXT4_MB_HINT_DATA		0x0020
108 /* don't preallocate (for tails) */
109 #define EXT4_MB_HINT_NOPREALLOC		0x0040
110 /* allocate for locality group */
111 #define EXT4_MB_HINT_GROUP_ALLOC	0x0080
112 /* allocate goal blocks or none */
113 #define EXT4_MB_HINT_GOAL_ONLY		0x0100
114 /* goal is meaningful */
115 #define EXT4_MB_HINT_TRY_GOAL		0x0200
116 /* blocks already pre-reserved by delayed allocation */
117 #define EXT4_MB_DELALLOC_RESERVED	0x0400
118 /* We are doing stream allocation */
119 #define EXT4_MB_STREAM_ALLOC		0x0800
120 /* Use reserved root blocks if needed */
121 #define EXT4_MB_USE_ROOT_BLOCKS		0x1000
122 /* Use blocks from reserved pool */
123 #define EXT4_MB_USE_RESERVED		0x2000
124 
125 struct ext4_allocation_request {
126 	/* target inode for block we're allocating */
127 	struct inode *inode;
128 	/* how many blocks we want to allocate */
129 	unsigned int len;
130 	/* logical block in target inode */
131 	ext4_lblk_t logical;
132 	/* the closest logical allocated block to the left */
133 	ext4_lblk_t lleft;
134 	/* the closest logical allocated block to the right */
135 	ext4_lblk_t lright;
136 	/* phys. target (a hint) */
137 	ext4_fsblk_t goal;
138 	/* phys. block for the closest logical allocated block to the left */
139 	ext4_fsblk_t pleft;
140 	/* phys. block for the closest logical allocated block to the right */
141 	ext4_fsblk_t pright;
142 	/* flags. see above EXT4_MB_HINT_* */
143 	unsigned int flags;
144 };
145 
146 /*
147  * Logical to physical block mapping, used by ext4_map_blocks()
148  *
149  * This structure is used to pass requests into ext4_map_blocks() as
150  * well as to store the information returned by ext4_map_blocks().  It
151  * takes less room on the stack than a struct buffer_head.
152  */
153 #define EXT4_MAP_NEW		(1 << BH_New)
154 #define EXT4_MAP_MAPPED		(1 << BH_Mapped)
155 #define EXT4_MAP_UNWRITTEN	(1 << BH_Unwritten)
156 #define EXT4_MAP_BOUNDARY	(1 << BH_Boundary)
157 #define EXT4_MAP_FLAGS		(EXT4_MAP_NEW | EXT4_MAP_MAPPED |\
158 				 EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY)
159 
160 struct ext4_map_blocks {
161 	ext4_fsblk_t m_pblk;
162 	ext4_lblk_t m_lblk;
163 	unsigned int m_len;
164 	unsigned int m_flags;
165 };
166 
167 /*
168  * Flags for ext4_io_end->flags
169  */
170 #define	EXT4_IO_END_UNWRITTEN	0x0001
171 
172 /*
173  * For converting unwritten extents on a work queue. 'handle' is used for
174  * buffered writeback.
175  */
176 typedef struct ext4_io_end {
177 	struct list_head	list;		/* per-file finished IO list */
178 	handle_t		*handle;	/* handle reserved for extent
179 						 * conversion */
180 	struct inode		*inode;		/* file being written to */
181 	struct bio		*bio;		/* Linked list of completed
182 						 * bios covering the extent */
183 	unsigned int		flag;		/* unwritten or not */
184 	loff_t			offset;		/* offset in the file */
185 	ssize_t			size;		/* size of the extent */
186 	atomic_t		count;		/* reference counter */
187 } ext4_io_end_t;
188 
189 struct ext4_io_submit {
190 	struct writeback_control *io_wbc;
191 	struct bio		*io_bio;
192 	ext4_io_end_t		*io_end;
193 	sector_t		io_next_block;
194 };
195 
196 /*
197  * Special inodes numbers
198  */
199 #define	EXT4_BAD_INO		 1	/* Bad blocks inode */
200 #define EXT4_ROOT_INO		 2	/* Root inode */
201 #define EXT4_USR_QUOTA_INO	 3	/* User quota inode */
202 #define EXT4_GRP_QUOTA_INO	 4	/* Group quota inode */
203 #define EXT4_BOOT_LOADER_INO	 5	/* Boot loader inode */
204 #define EXT4_UNDEL_DIR_INO	 6	/* Undelete directory inode */
205 #define EXT4_RESIZE_INO		 7	/* Reserved group descriptors inode */
206 #define EXT4_JOURNAL_INO	 8	/* Journal inode */
207 
208 /* First non-reserved inode for old ext4 filesystems */
209 #define EXT4_GOOD_OLD_FIRST_INO	11
210 
211 /*
212  * Maximal count of links to a file
213  */
214 #define EXT4_LINK_MAX		65000
215 
216 /*
217  * Macro-instructions used to manage several block sizes
218  */
219 #define EXT4_MIN_BLOCK_SIZE		1024
220 #define	EXT4_MAX_BLOCK_SIZE		65536
221 #define EXT4_MIN_BLOCK_LOG_SIZE		10
222 #define EXT4_MAX_BLOCK_LOG_SIZE		16
223 #ifdef __KERNEL__
224 # define EXT4_BLOCK_SIZE(s)		((s)->s_blocksize)
225 #else
226 # define EXT4_BLOCK_SIZE(s)		(EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
227 #endif
228 #define	EXT4_ADDR_PER_BLOCK(s)		(EXT4_BLOCK_SIZE(s) / sizeof(__u32))
229 #define EXT4_CLUSTER_SIZE(s)		(EXT4_BLOCK_SIZE(s) << \
230 					 EXT4_SB(s)->s_cluster_bits)
231 #ifdef __KERNEL__
232 # define EXT4_BLOCK_SIZE_BITS(s)	((s)->s_blocksize_bits)
233 # define EXT4_CLUSTER_BITS(s)		(EXT4_SB(s)->s_cluster_bits)
234 #else
235 # define EXT4_BLOCK_SIZE_BITS(s)	((s)->s_log_block_size + 10)
236 #endif
237 #ifdef __KERNEL__
238 #define	EXT4_ADDR_PER_BLOCK_BITS(s)	(EXT4_SB(s)->s_addr_per_block_bits)
239 #define EXT4_INODE_SIZE(s)		(EXT4_SB(s)->s_inode_size)
240 #define EXT4_FIRST_INO(s)		(EXT4_SB(s)->s_first_ino)
241 #else
242 #define EXT4_INODE_SIZE(s)	(((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
243 				 EXT4_GOOD_OLD_INODE_SIZE : \
244 				 (s)->s_inode_size)
245 #define EXT4_FIRST_INO(s)	(((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
246 				 EXT4_GOOD_OLD_FIRST_INO : \
247 				 (s)->s_first_ino)
248 #endif
249 #define EXT4_BLOCK_ALIGN(size, blkbits)		ALIGN((size), (1 << (blkbits)))
250 
251 /* Translate a block number to a cluster number */
252 #define EXT4_B2C(sbi, blk)	((blk) >> (sbi)->s_cluster_bits)
253 /* Translate a cluster number to a block number */
254 #define EXT4_C2B(sbi, cluster)	((cluster) << (sbi)->s_cluster_bits)
255 /* Translate # of blks to # of clusters */
256 #define EXT4_NUM_B2C(sbi, blks)	(((blks) + (sbi)->s_cluster_ratio - 1) >> \
257 				 (sbi)->s_cluster_bits)
258 /* Mask out the low bits to get the starting block of the cluster */
259 #define EXT4_PBLK_CMASK(s, pblk) ((pblk) &				\
260 				  ~((ext4_fsblk_t) (s)->s_cluster_ratio - 1))
261 #define EXT4_LBLK_CMASK(s, lblk) ((lblk) &				\
262 				  ~((ext4_lblk_t) (s)->s_cluster_ratio - 1))
263 /* Get the cluster offset */
264 #define EXT4_PBLK_COFF(s, pblk) ((pblk) &				\
265 				 ((ext4_fsblk_t) (s)->s_cluster_ratio - 1))
266 #define EXT4_LBLK_COFF(s, lblk) ((lblk) &				\
267 				 ((ext4_lblk_t) (s)->s_cluster_ratio - 1))
268 
269 /*
270  * Structure of a blocks group descriptor
271  */
272 struct ext4_group_desc
273 {
274 	__le32	bg_block_bitmap_lo;	/* Blocks bitmap block */
275 	__le32	bg_inode_bitmap_lo;	/* Inodes bitmap block */
276 	__le32	bg_inode_table_lo;	/* Inodes table block */
277 	__le16	bg_free_blocks_count_lo;/* Free blocks count */
278 	__le16	bg_free_inodes_count_lo;/* Free inodes count */
279 	__le16	bg_used_dirs_count_lo;	/* Directories count */
280 	__le16	bg_flags;		/* EXT4_BG_flags (INODE_UNINIT, etc) */
281 	__le32  bg_exclude_bitmap_lo;   /* Exclude bitmap for snapshots */
282 	__le16  bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bbitmap) LE */
283 	__le16  bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+ibitmap) LE */
284 	__le16  bg_itable_unused_lo;	/* Unused inodes count */
285 	__le16  bg_checksum;		/* crc16(sb_uuid+group+desc) */
286 	__le32	bg_block_bitmap_hi;	/* Blocks bitmap block MSB */
287 	__le32	bg_inode_bitmap_hi;	/* Inodes bitmap block MSB */
288 	__le32	bg_inode_table_hi;	/* Inodes table block MSB */
289 	__le16	bg_free_blocks_count_hi;/* Free blocks count MSB */
290 	__le16	bg_free_inodes_count_hi;/* Free inodes count MSB */
291 	__le16	bg_used_dirs_count_hi;	/* Directories count MSB */
292 	__le16  bg_itable_unused_hi;    /* Unused inodes count MSB */
293 	__le32  bg_exclude_bitmap_hi;   /* Exclude bitmap block MSB */
294 	__le16  bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bbitmap) BE */
295 	__le16  bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+ibitmap) BE */
296 	__u32   bg_reserved;
297 };
298 
299 #define EXT4_BG_INODE_BITMAP_CSUM_HI_END	\
300 	(offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \
301 	 sizeof(__le16))
302 #define EXT4_BG_BLOCK_BITMAP_CSUM_HI_END	\
303 	(offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \
304 	 sizeof(__le16))
305 
306 /*
307  * Structure of a flex block group info
308  */
309 
310 struct flex_groups {
311 	atomic64_t	free_clusters;
312 	atomic_t	free_inodes;
313 	atomic_t	used_dirs;
314 };
315 
316 #define EXT4_BG_INODE_UNINIT	0x0001 /* Inode table/bitmap not in use */
317 #define EXT4_BG_BLOCK_UNINIT	0x0002 /* Block bitmap not in use */
318 #define EXT4_BG_INODE_ZEROED	0x0004 /* On-disk itable initialized to zero */
319 
320 /*
321  * Macro-instructions used to manage group descriptors
322  */
323 #define EXT4_MIN_DESC_SIZE		32
324 #define EXT4_MIN_DESC_SIZE_64BIT	64
325 #define	EXT4_MAX_DESC_SIZE		EXT4_MIN_BLOCK_SIZE
326 #define EXT4_DESC_SIZE(s)		(EXT4_SB(s)->s_desc_size)
327 #ifdef __KERNEL__
328 # define EXT4_BLOCKS_PER_GROUP(s)	(EXT4_SB(s)->s_blocks_per_group)
329 # define EXT4_CLUSTERS_PER_GROUP(s)	(EXT4_SB(s)->s_clusters_per_group)
330 # define EXT4_DESC_PER_BLOCK(s)		(EXT4_SB(s)->s_desc_per_block)
331 # define EXT4_INODES_PER_GROUP(s)	(EXT4_SB(s)->s_inodes_per_group)
332 # define EXT4_DESC_PER_BLOCK_BITS(s)	(EXT4_SB(s)->s_desc_per_block_bits)
333 #else
334 # define EXT4_BLOCKS_PER_GROUP(s)	((s)->s_blocks_per_group)
335 # define EXT4_DESC_PER_BLOCK(s)		(EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
336 # define EXT4_INODES_PER_GROUP(s)	((s)->s_inodes_per_group)
337 #endif
338 
339 /*
340  * Constants relative to the data blocks
341  */
342 #define	EXT4_NDIR_BLOCKS		12
343 #define	EXT4_IND_BLOCK			EXT4_NDIR_BLOCKS
344 #define	EXT4_DIND_BLOCK			(EXT4_IND_BLOCK + 1)
345 #define	EXT4_TIND_BLOCK			(EXT4_DIND_BLOCK + 1)
346 #define	EXT4_N_BLOCKS			(EXT4_TIND_BLOCK + 1)
347 
348 /*
349  * Inode flags
350  */
351 #define	EXT4_SECRM_FL			0x00000001 /* Secure deletion */
352 #define	EXT4_UNRM_FL			0x00000002 /* Undelete */
353 #define	EXT4_COMPR_FL			0x00000004 /* Compress file */
354 #define EXT4_SYNC_FL			0x00000008 /* Synchronous updates */
355 #define EXT4_IMMUTABLE_FL		0x00000010 /* Immutable file */
356 #define EXT4_APPEND_FL			0x00000020 /* writes to file may only append */
357 #define EXT4_NODUMP_FL			0x00000040 /* do not dump file */
358 #define EXT4_NOATIME_FL			0x00000080 /* do not update atime */
359 /* Reserved for compression usage... */
360 #define EXT4_DIRTY_FL			0x00000100
361 #define EXT4_COMPRBLK_FL		0x00000200 /* One or more compressed clusters */
362 #define EXT4_NOCOMPR_FL			0x00000400 /* Don't compress */
363 	/* nb: was previously EXT2_ECOMPR_FL */
364 #define EXT4_ENCRYPT_FL			0x00000800 /* encrypted file */
365 /* End compression flags --- maybe not all used */
366 #define EXT4_INDEX_FL			0x00001000 /* hash-indexed directory */
367 #define EXT4_IMAGIC_FL			0x00002000 /* AFS directory */
368 #define EXT4_JOURNAL_DATA_FL		0x00004000 /* file data should be journaled */
369 #define EXT4_NOTAIL_FL			0x00008000 /* file tail should not be merged */
370 #define EXT4_DIRSYNC_FL			0x00010000 /* dirsync behaviour (directories only) */
371 #define EXT4_TOPDIR_FL			0x00020000 /* Top of directory hierarchies*/
372 #define EXT4_HUGE_FILE_FL               0x00040000 /* Set to each huge file */
373 #define EXT4_EXTENTS_FL			0x00080000 /* Inode uses extents */
374 #define EXT4_EA_INODE_FL	        0x00200000 /* Inode used for large EA */
375 #define EXT4_EOFBLOCKS_FL		0x00400000 /* Blocks allocated beyond EOF */
376 #define EXT4_INLINE_DATA_FL		0x10000000 /* Inode has inline data. */
377 #define EXT4_PROJINHERIT_FL		0x20000000 /* Create with parents projid */
378 #define EXT4_RESERVED_FL		0x80000000 /* reserved for ext4 lib */
379 
380 #define EXT4_FL_USER_VISIBLE		0x004BDFFF /* User visible flags */
381 #define EXT4_FL_USER_MODIFIABLE		0x004380FF /* User modifiable flags */
382 
383 /* Flags that should be inherited by new inodes from their parent. */
384 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\
385 			   EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\
386 			   EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\
387 			   EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL)
388 
389 /* Flags that are appropriate for regular files (all but dir-specific ones). */
390 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL))
391 
392 /* Flags that are appropriate for non-directories/regular files. */
393 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL)
394 
395 /* Mask out flags that are inappropriate for the given type of inode. */
396 static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags)
397 {
398 	if (S_ISDIR(mode))
399 		return flags;
400 	else if (S_ISREG(mode))
401 		return flags & EXT4_REG_FLMASK;
402 	else
403 		return flags & EXT4_OTHER_FLMASK;
404 }
405 
406 /*
407  * Inode flags used for atomic set/get
408  */
409 enum {
410 	EXT4_INODE_SECRM	= 0,	/* Secure deletion */
411 	EXT4_INODE_UNRM		= 1,	/* Undelete */
412 	EXT4_INODE_COMPR	= 2,	/* Compress file */
413 	EXT4_INODE_SYNC		= 3,	/* Synchronous updates */
414 	EXT4_INODE_IMMUTABLE	= 4,	/* Immutable file */
415 	EXT4_INODE_APPEND	= 5,	/* writes to file may only append */
416 	EXT4_INODE_NODUMP	= 6,	/* do not dump file */
417 	EXT4_INODE_NOATIME	= 7,	/* do not update atime */
418 /* Reserved for compression usage... */
419 	EXT4_INODE_DIRTY	= 8,
420 	EXT4_INODE_COMPRBLK	= 9,	/* One or more compressed clusters */
421 	EXT4_INODE_NOCOMPR	= 10,	/* Don't compress */
422 	EXT4_INODE_ENCRYPT	= 11,	/* Encrypted file */
423 /* End compression flags --- maybe not all used */
424 	EXT4_INODE_INDEX	= 12,	/* hash-indexed directory */
425 	EXT4_INODE_IMAGIC	= 13,	/* AFS directory */
426 	EXT4_INODE_JOURNAL_DATA	= 14,	/* file data should be journaled */
427 	EXT4_INODE_NOTAIL	= 15,	/* file tail should not be merged */
428 	EXT4_INODE_DIRSYNC	= 16,	/* dirsync behaviour (directories only) */
429 	EXT4_INODE_TOPDIR	= 17,	/* Top of directory hierarchies*/
430 	EXT4_INODE_HUGE_FILE	= 18,	/* Set to each huge file */
431 	EXT4_INODE_EXTENTS	= 19,	/* Inode uses extents */
432 	EXT4_INODE_EA_INODE	= 21,	/* Inode used for large EA */
433 	EXT4_INODE_EOFBLOCKS	= 22,	/* Blocks allocated beyond EOF */
434 	EXT4_INODE_INLINE_DATA	= 28,	/* Data in inode. */
435 	EXT4_INODE_PROJINHERIT	= 29,	/* Create with parents projid */
436 	EXT4_INODE_RESERVED	= 31,	/* reserved for ext4 lib */
437 };
438 
439 /*
440  * Since it's pretty easy to mix up bit numbers and hex values, we use a
441  * build-time check to make sure that EXT4_XXX_FL is consistent with respect to
442  * EXT4_INODE_XXX. If all is well, the macros will be dropped, so, it won't cost
443  * any extra space in the compiled kernel image, otherwise, the build will fail.
444  * It's important that these values are the same, since we are using
445  * EXT4_INODE_XXX to test for flag values, but EXT4_XXX_FL must be consistent
446  * with the values of FS_XXX_FL defined in include/linux/fs.h and the on-disk
447  * values found in ext2, ext3 and ext4 filesystems, and of course the values
448  * defined in e2fsprogs.
449  *
450  * It's not paranoia if the Murphy's Law really *is* out to get you.  :-)
451  */
452 #define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG))
453 #define CHECK_FLAG_VALUE(FLAG) BUILD_BUG_ON(!TEST_FLAG_VALUE(FLAG))
454 
455 static inline void ext4_check_flag_values(void)
456 {
457 	CHECK_FLAG_VALUE(SECRM);
458 	CHECK_FLAG_VALUE(UNRM);
459 	CHECK_FLAG_VALUE(COMPR);
460 	CHECK_FLAG_VALUE(SYNC);
461 	CHECK_FLAG_VALUE(IMMUTABLE);
462 	CHECK_FLAG_VALUE(APPEND);
463 	CHECK_FLAG_VALUE(NODUMP);
464 	CHECK_FLAG_VALUE(NOATIME);
465 	CHECK_FLAG_VALUE(DIRTY);
466 	CHECK_FLAG_VALUE(COMPRBLK);
467 	CHECK_FLAG_VALUE(NOCOMPR);
468 	CHECK_FLAG_VALUE(ENCRYPT);
469 	CHECK_FLAG_VALUE(INDEX);
470 	CHECK_FLAG_VALUE(IMAGIC);
471 	CHECK_FLAG_VALUE(JOURNAL_DATA);
472 	CHECK_FLAG_VALUE(NOTAIL);
473 	CHECK_FLAG_VALUE(DIRSYNC);
474 	CHECK_FLAG_VALUE(TOPDIR);
475 	CHECK_FLAG_VALUE(HUGE_FILE);
476 	CHECK_FLAG_VALUE(EXTENTS);
477 	CHECK_FLAG_VALUE(EA_INODE);
478 	CHECK_FLAG_VALUE(EOFBLOCKS);
479 	CHECK_FLAG_VALUE(INLINE_DATA);
480 	CHECK_FLAG_VALUE(PROJINHERIT);
481 	CHECK_FLAG_VALUE(RESERVED);
482 }
483 
484 /* Used to pass group descriptor data when online resize is done */
485 struct ext4_new_group_input {
486 	__u32 group;		/* Group number for this data */
487 	__u64 block_bitmap;	/* Absolute block number of block bitmap */
488 	__u64 inode_bitmap;	/* Absolute block number of inode bitmap */
489 	__u64 inode_table;	/* Absolute block number of inode table start */
490 	__u32 blocks_count;	/* Total number of blocks in this group */
491 	__u16 reserved_blocks;	/* Number of reserved blocks in this group */
492 	__u16 unused;
493 };
494 
495 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
496 struct compat_ext4_new_group_input {
497 	u32 group;
498 	compat_u64 block_bitmap;
499 	compat_u64 inode_bitmap;
500 	compat_u64 inode_table;
501 	u32 blocks_count;
502 	u16 reserved_blocks;
503 	u16 unused;
504 };
505 #endif
506 
507 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */
508 struct ext4_new_group_data {
509 	__u32 group;
510 	__u64 block_bitmap;
511 	__u64 inode_bitmap;
512 	__u64 inode_table;
513 	__u32 blocks_count;
514 	__u16 reserved_blocks;
515 	__u16 unused;
516 	__u32 free_blocks_count;
517 };
518 
519 /* Indexes used to index group tables in ext4_new_group_data */
520 enum {
521 	BLOCK_BITMAP = 0,	/* block bitmap */
522 	INODE_BITMAP,		/* inode bitmap */
523 	INODE_TABLE,		/* inode tables */
524 	GROUP_TABLE_COUNT,
525 };
526 
527 /*
528  * Flags used by ext4_map_blocks()
529  */
530 	/* Allocate any needed blocks and/or convert an unwritten
531 	   extent to be an initialized ext4 */
532 #define EXT4_GET_BLOCKS_CREATE			0x0001
533 	/* Request the creation of an unwritten extent */
534 #define EXT4_GET_BLOCKS_UNWRIT_EXT		0x0002
535 #define EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT	(EXT4_GET_BLOCKS_UNWRIT_EXT|\
536 						 EXT4_GET_BLOCKS_CREATE)
537 	/* Caller is from the delayed allocation writeout path
538 	 * finally doing the actual allocation of delayed blocks */
539 #define EXT4_GET_BLOCKS_DELALLOC_RESERVE	0x0004
540 	/* caller is from the direct IO path, request to creation of an
541 	unwritten extents if not allocated, split the unwritten
542 	extent if blocks has been preallocated already*/
543 #define EXT4_GET_BLOCKS_PRE_IO			0x0008
544 #define EXT4_GET_BLOCKS_CONVERT			0x0010
545 #define EXT4_GET_BLOCKS_IO_CREATE_EXT		(EXT4_GET_BLOCKS_PRE_IO|\
546 					 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT)
547 	/* Convert extent to initialized after IO complete */
548 #define EXT4_GET_BLOCKS_IO_CONVERT_EXT		(EXT4_GET_BLOCKS_CONVERT|\
549 					 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT)
550 	/* Eventual metadata allocation (due to growing extent tree)
551 	 * should not fail, so try to use reserved blocks for that.*/
552 #define EXT4_GET_BLOCKS_METADATA_NOFAIL		0x0020
553 	/* Don't normalize allocation size (used for fallocate) */
554 #define EXT4_GET_BLOCKS_NO_NORMALIZE		0x0040
555 	/* Request will not result in inode size update (user for fallocate) */
556 #define EXT4_GET_BLOCKS_KEEP_SIZE		0x0080
557 	/* Do not take i_data_sem locking in ext4_map_blocks */
558 #define EXT4_GET_BLOCKS_NO_LOCK			0x0100
559 	/* Convert written extents to unwritten */
560 #define EXT4_GET_BLOCKS_CONVERT_UNWRITTEN	0x0200
561 
562 /*
563  * The bit position of these flags must not overlap with any of the
564  * EXT4_GET_BLOCKS_*.  They are used by ext4_find_extent(),
565  * read_extent_tree_block(), ext4_split_extent_at(),
566  * ext4_ext_insert_extent(), and ext4_ext_create_new_leaf().
567  * EXT4_EX_NOCACHE is used to indicate that the we shouldn't be
568  * caching the extents when reading from the extent tree while a
569  * truncate or punch hole operation is in progress.
570  */
571 #define EXT4_EX_NOCACHE				0x40000000
572 #define EXT4_EX_FORCE_CACHE			0x20000000
573 
574 /*
575  * Flags used by ext4_free_blocks
576  */
577 #define EXT4_FREE_BLOCKS_METADATA	0x0001
578 #define EXT4_FREE_BLOCKS_FORGET		0x0002
579 #define EXT4_FREE_BLOCKS_VALIDATED	0x0004
580 #define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE	0x0008
581 #define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER	0x0010
582 #define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER	0x0020
583 
584 /* Encryption algorithms */
585 #define EXT4_ENCRYPTION_MODE_INVALID		0
586 #define EXT4_ENCRYPTION_MODE_AES_256_XTS	1
587 #define EXT4_ENCRYPTION_MODE_AES_256_GCM	2
588 #define EXT4_ENCRYPTION_MODE_AES_256_CBC	3
589 #define EXT4_ENCRYPTION_MODE_AES_256_CTS	4
590 
591 #include "ext4_crypto.h"
592 
593 /*
594  * ioctl commands
595  */
596 #define	EXT4_IOC_GETFLAGS		FS_IOC_GETFLAGS
597 #define	EXT4_IOC_SETFLAGS		FS_IOC_SETFLAGS
598 #define	EXT4_IOC_GETVERSION		_IOR('f', 3, long)
599 #define	EXT4_IOC_SETVERSION		_IOW('f', 4, long)
600 #define	EXT4_IOC_GETVERSION_OLD		FS_IOC_GETVERSION
601 #define	EXT4_IOC_SETVERSION_OLD		FS_IOC_SETVERSION
602 #define EXT4_IOC_GETRSVSZ		_IOR('f', 5, long)
603 #define EXT4_IOC_SETRSVSZ		_IOW('f', 6, long)
604 #define EXT4_IOC_GROUP_EXTEND		_IOW('f', 7, unsigned long)
605 #define EXT4_IOC_GROUP_ADD		_IOW('f', 8, struct ext4_new_group_input)
606 #define EXT4_IOC_MIGRATE		_IO('f', 9)
607  /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */
608  /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */
609 #define EXT4_IOC_ALLOC_DA_BLKS		_IO('f', 12)
610 #define EXT4_IOC_MOVE_EXT		_IOWR('f', 15, struct move_extent)
611 #define EXT4_IOC_RESIZE_FS		_IOW('f', 16, __u64)
612 #define EXT4_IOC_SWAP_BOOT		_IO('f', 17)
613 #define EXT4_IOC_PRECACHE_EXTENTS	_IO('f', 18)
614 #define EXT4_IOC_SET_ENCRYPTION_POLICY	_IOR('f', 19, struct ext4_encryption_policy)
615 #define EXT4_IOC_GET_ENCRYPTION_PWSALT	_IOW('f', 20, __u8[16])
616 #define EXT4_IOC_GET_ENCRYPTION_POLICY	_IOW('f', 21, struct ext4_encryption_policy)
617 
618 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
619 /*
620  * ioctl commands in 32 bit emulation
621  */
622 #define EXT4_IOC32_GETFLAGS		FS_IOC32_GETFLAGS
623 #define EXT4_IOC32_SETFLAGS		FS_IOC32_SETFLAGS
624 #define EXT4_IOC32_GETVERSION		_IOR('f', 3, int)
625 #define EXT4_IOC32_SETVERSION		_IOW('f', 4, int)
626 #define EXT4_IOC32_GETRSVSZ		_IOR('f', 5, int)
627 #define EXT4_IOC32_SETRSVSZ		_IOW('f', 6, int)
628 #define EXT4_IOC32_GROUP_EXTEND		_IOW('f', 7, unsigned int)
629 #define EXT4_IOC32_GROUP_ADD		_IOW('f', 8, struct compat_ext4_new_group_input)
630 #define EXT4_IOC32_GETVERSION_OLD	FS_IOC32_GETVERSION
631 #define EXT4_IOC32_SETVERSION_OLD	FS_IOC32_SETVERSION
632 #endif
633 
634 /* Max physical block we can address w/o extents */
635 #define EXT4_MAX_BLOCK_FILE_PHYS	0xFFFFFFFF
636 
637 /*
638  * Structure of an inode on the disk
639  */
640 struct ext4_inode {
641 	__le16	i_mode;		/* File mode */
642 	__le16	i_uid;		/* Low 16 bits of Owner Uid */
643 	__le32	i_size_lo;	/* Size in bytes */
644 	__le32	i_atime;	/* Access time */
645 	__le32	i_ctime;	/* Inode Change time */
646 	__le32	i_mtime;	/* Modification time */
647 	__le32	i_dtime;	/* Deletion Time */
648 	__le16	i_gid;		/* Low 16 bits of Group Id */
649 	__le16	i_links_count;	/* Links count */
650 	__le32	i_blocks_lo;	/* Blocks count */
651 	__le32	i_flags;	/* File flags */
652 	union {
653 		struct {
654 			__le32  l_i_version;
655 		} linux1;
656 		struct {
657 			__u32  h_i_translator;
658 		} hurd1;
659 		struct {
660 			__u32  m_i_reserved1;
661 		} masix1;
662 	} osd1;				/* OS dependent 1 */
663 	__le32	i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
664 	__le32	i_generation;	/* File version (for NFS) */
665 	__le32	i_file_acl_lo;	/* File ACL */
666 	__le32	i_size_high;
667 	__le32	i_obso_faddr;	/* Obsoleted fragment address */
668 	union {
669 		struct {
670 			__le16	l_i_blocks_high; /* were l_i_reserved1 */
671 			__le16	l_i_file_acl_high;
672 			__le16	l_i_uid_high;	/* these 2 fields */
673 			__le16	l_i_gid_high;	/* were reserved2[0] */
674 			__le16	l_i_checksum_lo;/* crc32c(uuid+inum+inode) LE */
675 			__le16	l_i_reserved;
676 		} linux2;
677 		struct {
678 			__le16	h_i_reserved1;	/* Obsoleted fragment number/size which are removed in ext4 */
679 			__u16	h_i_mode_high;
680 			__u16	h_i_uid_high;
681 			__u16	h_i_gid_high;
682 			__u32	h_i_author;
683 		} hurd2;
684 		struct {
685 			__le16	h_i_reserved1;	/* Obsoleted fragment number/size which are removed in ext4 */
686 			__le16	m_i_file_acl_high;
687 			__u32	m_i_reserved2[2];
688 		} masix2;
689 	} osd2;				/* OS dependent 2 */
690 	__le16	i_extra_isize;
691 	__le16	i_checksum_hi;	/* crc32c(uuid+inum+inode) BE */
692 	__le32  i_ctime_extra;  /* extra Change time      (nsec << 2 | epoch) */
693 	__le32  i_mtime_extra;  /* extra Modification time(nsec << 2 | epoch) */
694 	__le32  i_atime_extra;  /* extra Access time      (nsec << 2 | epoch) */
695 	__le32  i_crtime;       /* File Creation time */
696 	__le32  i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */
697 	__le32  i_version_hi;	/* high 32 bits for 64-bit version */
698 	__le32	i_projid;	/* Project ID */
699 };
700 
701 struct move_extent {
702 	__u32 reserved;		/* should be zero */
703 	__u32 donor_fd;		/* donor file descriptor */
704 	__u64 orig_start;	/* logical start offset in block for orig */
705 	__u64 donor_start;	/* logical start offset in block for donor */
706 	__u64 len;		/* block length to be moved */
707 	__u64 moved_len;	/* moved block length */
708 };
709 
710 #define EXT4_EPOCH_BITS 2
711 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
712 #define EXT4_NSEC_MASK  (~0UL << EXT4_EPOCH_BITS)
713 
714 /*
715  * Extended fields will fit into an inode if the filesystem was formatted
716  * with large inodes (-I 256 or larger) and there are not currently any EAs
717  * consuming all of the available space. For new inodes we always reserve
718  * enough space for the kernel's known extended fields, but for inodes
719  * created with an old kernel this might not have been the case. None of
720  * the extended inode fields is critical for correct filesystem operation.
721  * This macro checks if a certain field fits in the inode. Note that
722  * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
723  */
724 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field)	\
725 	((offsetof(typeof(*ext4_inode), field) +	\
726 	  sizeof((ext4_inode)->field))			\
727 	<= (EXT4_GOOD_OLD_INODE_SIZE +			\
728 	    (einode)->i_extra_isize))			\
729 
730 static inline __le32 ext4_encode_extra_time(struct timespec *time)
731 {
732        return cpu_to_le32((sizeof(time->tv_sec) > 4 ?
733 			   (time->tv_sec >> 32) & EXT4_EPOCH_MASK : 0) |
734                           ((time->tv_nsec << EXT4_EPOCH_BITS) & EXT4_NSEC_MASK));
735 }
736 
737 static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra)
738 {
739        if (sizeof(time->tv_sec) > 4)
740 	       time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK)
741 			       << 32;
742        time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS;
743 }
744 
745 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode)			       \
746 do {									       \
747 	(raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec);	       \
748 	if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra))     \
749 		(raw_inode)->xtime ## _extra =				       \
750 				ext4_encode_extra_time(&(inode)->xtime);       \
751 } while (0)
752 
753 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode)			       \
754 do {									       \
755 	if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime))		       \
756 		(raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec);      \
757 	if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra))	       \
758 		(raw_inode)->xtime ## _extra =				       \
759 				ext4_encode_extra_time(&(einode)->xtime);      \
760 } while (0)
761 
762 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode)			       \
763 do {									       \
764 	(inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime);       \
765 	if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra))     \
766 		ext4_decode_extra_time(&(inode)->xtime,			       \
767 				       raw_inode->xtime ## _extra);	       \
768 	else								       \
769 		(inode)->xtime.tv_nsec = 0;				       \
770 } while (0)
771 
772 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode)			       \
773 do {									       \
774 	if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime))		       \
775 		(einode)->xtime.tv_sec = 				       \
776 			(signed)le32_to_cpu((raw_inode)->xtime);	       \
777 	else								       \
778 		(einode)->xtime.tv_sec = 0;				       \
779 	if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra))	       \
780 		ext4_decode_extra_time(&(einode)->xtime,		       \
781 				       raw_inode->xtime ## _extra);	       \
782 	else								       \
783 		(einode)->xtime.tv_nsec = 0;				       \
784 } while (0)
785 
786 #define i_disk_version osd1.linux1.l_i_version
787 
788 #if defined(__KERNEL__) || defined(__linux__)
789 #define i_reserved1	osd1.linux1.l_i_reserved1
790 #define i_file_acl_high	osd2.linux2.l_i_file_acl_high
791 #define i_blocks_high	osd2.linux2.l_i_blocks_high
792 #define i_uid_low	i_uid
793 #define i_gid_low	i_gid
794 #define i_uid_high	osd2.linux2.l_i_uid_high
795 #define i_gid_high	osd2.linux2.l_i_gid_high
796 #define i_checksum_lo	osd2.linux2.l_i_checksum_lo
797 
798 #elif defined(__GNU__)
799 
800 #define i_translator	osd1.hurd1.h_i_translator
801 #define i_uid_high	osd2.hurd2.h_i_uid_high
802 #define i_gid_high	osd2.hurd2.h_i_gid_high
803 #define i_author	osd2.hurd2.h_i_author
804 
805 #elif defined(__masix__)
806 
807 #define i_reserved1	osd1.masix1.m_i_reserved1
808 #define i_file_acl_high	osd2.masix2.m_i_file_acl_high
809 #define i_reserved2	osd2.masix2.m_i_reserved2
810 
811 #endif /* defined(__KERNEL__) || defined(__linux__) */
812 
813 #include "extents_status.h"
814 
815 /*
816  * fourth extended file system inode data in memory
817  */
818 struct ext4_inode_info {
819 	__le32	i_data[15];	/* unconverted */
820 	__u32	i_dtime;
821 	ext4_fsblk_t	i_file_acl;
822 
823 	/*
824 	 * i_block_group is the number of the block group which contains
825 	 * this file's inode.  Constant across the lifetime of the inode,
826 	 * it is ued for making block allocation decisions - we try to
827 	 * place a file's data blocks near its inode block, and new inodes
828 	 * near to their parent directory's inode.
829 	 */
830 	ext4_group_t	i_block_group;
831 	ext4_lblk_t	i_dir_start_lookup;
832 #if (BITS_PER_LONG < 64)
833 	unsigned long	i_state_flags;		/* Dynamic state flags */
834 #endif
835 	unsigned long	i_flags;
836 
837 	/*
838 	 * Extended attributes can be read independently of the main file
839 	 * data. Taking i_mutex even when reading would cause contention
840 	 * between readers of EAs and writers of regular file data, so
841 	 * instead we synchronize on xattr_sem when reading or changing
842 	 * EAs.
843 	 */
844 	struct rw_semaphore xattr_sem;
845 
846 	struct list_head i_orphan;	/* unlinked but open inodes */
847 
848 	/*
849 	 * i_disksize keeps track of what the inode size is ON DISK, not
850 	 * in memory.  During truncate, i_size is set to the new size by
851 	 * the VFS prior to calling ext4_truncate(), but the filesystem won't
852 	 * set i_disksize to 0 until the truncate is actually under way.
853 	 *
854 	 * The intent is that i_disksize always represents the blocks which
855 	 * are used by this file.  This allows recovery to restart truncate
856 	 * on orphans if we crash during truncate.  We actually write i_disksize
857 	 * into the on-disk inode when writing inodes out, instead of i_size.
858 	 *
859 	 * The only time when i_disksize and i_size may be different is when
860 	 * a truncate is in progress.  The only things which change i_disksize
861 	 * are ext4_get_block (growth) and ext4_truncate (shrinkth).
862 	 */
863 	loff_t	i_disksize;
864 
865 	/*
866 	 * i_data_sem is for serialising ext4_truncate() against
867 	 * ext4_getblock().  In the 2.4 ext2 design, great chunks of inode's
868 	 * data tree are chopped off during truncate. We can't do that in
869 	 * ext4 because whenever we perform intermediate commits during
870 	 * truncate, the inode and all the metadata blocks *must* be in a
871 	 * consistent state which allows truncation of the orphans to restart
872 	 * during recovery.  Hence we must fix the get_block-vs-truncate race
873 	 * by other means, so we have i_data_sem.
874 	 */
875 	struct rw_semaphore i_data_sem;
876 	struct inode vfs_inode;
877 	struct jbd2_inode *jinode;
878 
879 	spinlock_t i_raw_lock;	/* protects updates to the raw inode */
880 
881 	/*
882 	 * File creation time. Its function is same as that of
883 	 * struct timespec i_{a,c,m}time in the generic inode.
884 	 */
885 	struct timespec i_crtime;
886 
887 	/* mballoc */
888 	struct list_head i_prealloc_list;
889 	spinlock_t i_prealloc_lock;
890 
891 	/* extents status tree */
892 	struct ext4_es_tree i_es_tree;
893 	rwlock_t i_es_lock;
894 	struct list_head i_es_list;
895 	unsigned int i_es_all_nr;	/* protected by i_es_lock */
896 	unsigned int i_es_shk_nr;	/* protected by i_es_lock */
897 	ext4_lblk_t i_es_shrink_lblk;	/* Offset where we start searching for
898 					   extents to shrink. Protected by
899 					   i_es_lock  */
900 
901 	/* ialloc */
902 	ext4_group_t	i_last_alloc_group;
903 
904 	/* allocation reservation info for delalloc */
905 	/* In case of bigalloc, these refer to clusters rather than blocks */
906 	unsigned int i_reserved_data_blocks;
907 	unsigned int i_reserved_meta_blocks;
908 	unsigned int i_allocated_meta_blocks;
909 	ext4_lblk_t i_da_metadata_calc_last_lblock;
910 	int i_da_metadata_calc_len;
911 
912 	/* on-disk additional length */
913 	__u16 i_extra_isize;
914 
915 	/* Indicate the inline data space. */
916 	u16 i_inline_off;
917 	u16 i_inline_size;
918 
919 #ifdef CONFIG_QUOTA
920 	/* quota space reservation, managed internally by quota code */
921 	qsize_t i_reserved_quota;
922 #endif
923 
924 	/* Lock protecting lists below */
925 	spinlock_t i_completed_io_lock;
926 	/*
927 	 * Completed IOs that need unwritten extents handling and have
928 	 * transaction reserved
929 	 */
930 	struct list_head i_rsv_conversion_list;
931 	/*
932 	 * Completed IOs that need unwritten extents handling and don't have
933 	 * transaction reserved
934 	 */
935 	atomic_t i_ioend_count;	/* Number of outstanding io_end structs */
936 	atomic_t i_unwritten; /* Nr. of inflight conversions pending */
937 	struct work_struct i_rsv_conversion_work;
938 
939 	spinlock_t i_block_reservation_lock;
940 
941 	/*
942 	 * Transactions that contain inode's metadata needed to complete
943 	 * fsync and fdatasync, respectively.
944 	 */
945 	tid_t i_sync_tid;
946 	tid_t i_datasync_tid;
947 
948 #ifdef CONFIG_QUOTA
949 	struct dquot *i_dquot[MAXQUOTAS];
950 #endif
951 
952 	/* Precomputed uuid+inum+igen checksum for seeding inode checksums */
953 	__u32 i_csum_seed;
954 
955 #ifdef CONFIG_EXT4_FS_ENCRYPTION
956 	/* Encryption params */
957 	struct ext4_crypt_info *i_crypt_info;
958 #endif
959 };
960 
961 /*
962  * File system states
963  */
964 #define	EXT4_VALID_FS			0x0001	/* Unmounted cleanly */
965 #define	EXT4_ERROR_FS			0x0002	/* Errors detected */
966 #define	EXT4_ORPHAN_FS			0x0004	/* Orphans being recovered */
967 
968 /*
969  * Misc. filesystem flags
970  */
971 #define EXT2_FLAGS_SIGNED_HASH		0x0001  /* Signed dirhash in use */
972 #define EXT2_FLAGS_UNSIGNED_HASH	0x0002  /* Unsigned dirhash in use */
973 #define EXT2_FLAGS_TEST_FILESYS		0x0004	/* to test development code */
974 
975 /*
976  * Mount flags set via mount options or defaults
977  */
978 #define EXT4_MOUNT_GRPID		0x00004	/* Create files with directory's group */
979 #define EXT4_MOUNT_DEBUG		0x00008	/* Some debugging messages */
980 #define EXT4_MOUNT_ERRORS_CONT		0x00010	/* Continue on errors */
981 #define EXT4_MOUNT_ERRORS_RO		0x00020	/* Remount fs ro on errors */
982 #define EXT4_MOUNT_ERRORS_PANIC		0x00040	/* Panic on errors */
983 #define EXT4_MOUNT_ERRORS_MASK		0x00070
984 #define EXT4_MOUNT_MINIX_DF		0x00080	/* Mimics the Minix statfs */
985 #define EXT4_MOUNT_NOLOAD		0x00100	/* Don't use existing journal*/
986 #ifdef CONFIG_FS_DAX
987 #define EXT4_MOUNT_DAX			0x00200	/* Direct Access */
988 #else
989 #define EXT4_MOUNT_DAX			0
990 #endif
991 #define EXT4_MOUNT_DATA_FLAGS		0x00C00	/* Mode for data writes: */
992 #define EXT4_MOUNT_JOURNAL_DATA		0x00400	/* Write data to journal */
993 #define EXT4_MOUNT_ORDERED_DATA		0x00800	/* Flush data before commit */
994 #define EXT4_MOUNT_WRITEBACK_DATA	0x00C00	/* No data ordering */
995 #define EXT4_MOUNT_UPDATE_JOURNAL	0x01000	/* Update the journal format */
996 #define EXT4_MOUNT_NO_UID32		0x02000  /* Disable 32-bit UIDs */
997 #define EXT4_MOUNT_XATTR_USER		0x04000	/* Extended user attributes */
998 #define EXT4_MOUNT_POSIX_ACL		0x08000	/* POSIX Access Control Lists */
999 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC	0x10000	/* No auto delalloc mapping */
1000 #define EXT4_MOUNT_BARRIER		0x20000 /* Use block barriers */
1001 #define EXT4_MOUNT_QUOTA		0x80000 /* Some quota option set */
1002 #define EXT4_MOUNT_USRQUOTA		0x100000 /* "old" user quota */
1003 #define EXT4_MOUNT_GRPQUOTA		0x200000 /* "old" group quota */
1004 #define EXT4_MOUNT_DIOREAD_NOLOCK	0x400000 /* Enable support for dio read nolocking */
1005 #define EXT4_MOUNT_JOURNAL_CHECKSUM	0x800000 /* Journal checksums */
1006 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT	0x1000000 /* Journal Async Commit */
1007 #define EXT4_MOUNT_DELALLOC		0x8000000 /* Delalloc support */
1008 #define EXT4_MOUNT_DATA_ERR_ABORT	0x10000000 /* Abort on file data write */
1009 #define EXT4_MOUNT_BLOCK_VALIDITY	0x20000000 /* Block validity checking */
1010 #define EXT4_MOUNT_DISCARD		0x40000000 /* Issue DISCARD requests */
1011 #define EXT4_MOUNT_INIT_INODE_TABLE	0x80000000 /* Initialize uninitialized itables */
1012 
1013 /*
1014  * Mount flags set either automatically (could not be set by mount option)
1015  * based on per file system feature or property or in special cases such as
1016  * distinguishing between explicit mount option definition and default.
1017  */
1018 #define EXT4_MOUNT2_EXPLICIT_DELALLOC	0x00000001 /* User explicitly
1019 						      specified delalloc */
1020 #define EXT4_MOUNT2_STD_GROUP_SIZE	0x00000002 /* We have standard group
1021 						      size of blocksize * 8
1022 						      blocks */
1023 #define EXT4_MOUNT2_HURD_COMPAT		0x00000004 /* Support HURD-castrated
1024 						      file systems */
1025 
1026 #define EXT4_MOUNT2_EXPLICIT_JOURNAL_CHECKSUM	0x00000008 /* User explicitly
1027 						specified journal checksum */
1028 
1029 #define clear_opt(sb, opt)		EXT4_SB(sb)->s_mount_opt &= \
1030 						~EXT4_MOUNT_##opt
1031 #define set_opt(sb, opt)		EXT4_SB(sb)->s_mount_opt |= \
1032 						EXT4_MOUNT_##opt
1033 #define test_opt(sb, opt)		(EXT4_SB(sb)->s_mount_opt & \
1034 					 EXT4_MOUNT_##opt)
1035 
1036 #define clear_opt2(sb, opt)		EXT4_SB(sb)->s_mount_opt2 &= \
1037 						~EXT4_MOUNT2_##opt
1038 #define set_opt2(sb, opt)		EXT4_SB(sb)->s_mount_opt2 |= \
1039 						EXT4_MOUNT2_##opt
1040 #define test_opt2(sb, opt)		(EXT4_SB(sb)->s_mount_opt2 & \
1041 					 EXT4_MOUNT2_##opt)
1042 
1043 #define ext4_test_and_set_bit		__test_and_set_bit_le
1044 #define ext4_set_bit			__set_bit_le
1045 #define ext4_set_bit_atomic		ext2_set_bit_atomic
1046 #define ext4_test_and_clear_bit		__test_and_clear_bit_le
1047 #define ext4_clear_bit			__clear_bit_le
1048 #define ext4_clear_bit_atomic		ext2_clear_bit_atomic
1049 #define ext4_test_bit			test_bit_le
1050 #define ext4_find_next_zero_bit		find_next_zero_bit_le
1051 #define ext4_find_next_bit		find_next_bit_le
1052 
1053 extern void ext4_set_bits(void *bm, int cur, int len);
1054 
1055 /*
1056  * Maximal mount counts between two filesystem checks
1057  */
1058 #define EXT4_DFL_MAX_MNT_COUNT		20	/* Allow 20 mounts */
1059 #define EXT4_DFL_CHECKINTERVAL		0	/* Don't use interval check */
1060 
1061 /*
1062  * Behaviour when detecting errors
1063  */
1064 #define EXT4_ERRORS_CONTINUE		1	/* Continue execution */
1065 #define EXT4_ERRORS_RO			2	/* Remount fs read-only */
1066 #define EXT4_ERRORS_PANIC		3	/* Panic */
1067 #define EXT4_ERRORS_DEFAULT		EXT4_ERRORS_CONTINUE
1068 
1069 /* Metadata checksum algorithm codes */
1070 #define EXT4_CRC32C_CHKSUM		1
1071 
1072 /*
1073  * Structure of the super block
1074  */
1075 struct ext4_super_block {
1076 /*00*/	__le32	s_inodes_count;		/* Inodes count */
1077 	__le32	s_blocks_count_lo;	/* Blocks count */
1078 	__le32	s_r_blocks_count_lo;	/* Reserved blocks count */
1079 	__le32	s_free_blocks_count_lo;	/* Free blocks count */
1080 /*10*/	__le32	s_free_inodes_count;	/* Free inodes count */
1081 	__le32	s_first_data_block;	/* First Data Block */
1082 	__le32	s_log_block_size;	/* Block size */
1083 	__le32	s_log_cluster_size;	/* Allocation cluster size */
1084 /*20*/	__le32	s_blocks_per_group;	/* # Blocks per group */
1085 	__le32	s_clusters_per_group;	/* # Clusters per group */
1086 	__le32	s_inodes_per_group;	/* # Inodes per group */
1087 	__le32	s_mtime;		/* Mount time */
1088 /*30*/	__le32	s_wtime;		/* Write time */
1089 	__le16	s_mnt_count;		/* Mount count */
1090 	__le16	s_max_mnt_count;	/* Maximal mount count */
1091 	__le16	s_magic;		/* Magic signature */
1092 	__le16	s_state;		/* File system state */
1093 	__le16	s_errors;		/* Behaviour when detecting errors */
1094 	__le16	s_minor_rev_level;	/* minor revision level */
1095 /*40*/	__le32	s_lastcheck;		/* time of last check */
1096 	__le32	s_checkinterval;	/* max. time between checks */
1097 	__le32	s_creator_os;		/* OS */
1098 	__le32	s_rev_level;		/* Revision level */
1099 /*50*/	__le16	s_def_resuid;		/* Default uid for reserved blocks */
1100 	__le16	s_def_resgid;		/* Default gid for reserved blocks */
1101 	/*
1102 	 * These fields are for EXT4_DYNAMIC_REV superblocks only.
1103 	 *
1104 	 * Note: the difference between the compatible feature set and
1105 	 * the incompatible feature set is that if there is a bit set
1106 	 * in the incompatible feature set that the kernel doesn't
1107 	 * know about, it should refuse to mount the filesystem.
1108 	 *
1109 	 * e2fsck's requirements are more strict; if it doesn't know
1110 	 * about a feature in either the compatible or incompatible
1111 	 * feature set, it must abort and not try to meddle with
1112 	 * things it doesn't understand...
1113 	 */
1114 	__le32	s_first_ino;		/* First non-reserved inode */
1115 	__le16  s_inode_size;		/* size of inode structure */
1116 	__le16	s_block_group_nr;	/* block group # of this superblock */
1117 	__le32	s_feature_compat;	/* compatible feature set */
1118 /*60*/	__le32	s_feature_incompat;	/* incompatible feature set */
1119 	__le32	s_feature_ro_compat;	/* readonly-compatible feature set */
1120 /*68*/	__u8	s_uuid[16];		/* 128-bit uuid for volume */
1121 /*78*/	char	s_volume_name[16];	/* volume name */
1122 /*88*/	char	s_last_mounted[64];	/* directory where last mounted */
1123 /*C8*/	__le32	s_algorithm_usage_bitmap; /* For compression */
1124 	/*
1125 	 * Performance hints.  Directory preallocation should only
1126 	 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
1127 	 */
1128 	__u8	s_prealloc_blocks;	/* Nr of blocks to try to preallocate*/
1129 	__u8	s_prealloc_dir_blocks;	/* Nr to preallocate for dirs */
1130 	__le16	s_reserved_gdt_blocks;	/* Per group desc for online growth */
1131 	/*
1132 	 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
1133 	 */
1134 /*D0*/	__u8	s_journal_uuid[16];	/* uuid of journal superblock */
1135 /*E0*/	__le32	s_journal_inum;		/* inode number of journal file */
1136 	__le32	s_journal_dev;		/* device number of journal file */
1137 	__le32	s_last_orphan;		/* start of list of inodes to delete */
1138 	__le32	s_hash_seed[4];		/* HTREE hash seed */
1139 	__u8	s_def_hash_version;	/* Default hash version to use */
1140 	__u8	s_jnl_backup_type;
1141 	__le16  s_desc_size;		/* size of group descriptor */
1142 /*100*/	__le32	s_default_mount_opts;
1143 	__le32	s_first_meta_bg;	/* First metablock block group */
1144 	__le32	s_mkfs_time;		/* When the filesystem was created */
1145 	__le32	s_jnl_blocks[17];	/* Backup of the journal inode */
1146 	/* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
1147 /*150*/	__le32	s_blocks_count_hi;	/* Blocks count */
1148 	__le32	s_r_blocks_count_hi;	/* Reserved blocks count */
1149 	__le32	s_free_blocks_count_hi;	/* Free blocks count */
1150 	__le16	s_min_extra_isize;	/* All inodes have at least # bytes */
1151 	__le16	s_want_extra_isize; 	/* New inodes should reserve # bytes */
1152 	__le32	s_flags;		/* Miscellaneous flags */
1153 	__le16  s_raid_stride;		/* RAID stride */
1154 	__le16  s_mmp_update_interval;  /* # seconds to wait in MMP checking */
1155 	__le64  s_mmp_block;            /* Block for multi-mount protection */
1156 	__le32  s_raid_stripe_width;    /* blocks on all data disks (N*stride)*/
1157 	__u8	s_log_groups_per_flex;  /* FLEX_BG group size */
1158 	__u8	s_checksum_type;	/* metadata checksum algorithm used */
1159 	__u8	s_encryption_level;	/* versioning level for encryption */
1160 	__u8	s_reserved_pad;		/* Padding to next 32bits */
1161 	__le64	s_kbytes_written;	/* nr of lifetime kilobytes written */
1162 	__le32	s_snapshot_inum;	/* Inode number of active snapshot */
1163 	__le32	s_snapshot_id;		/* sequential ID of active snapshot */
1164 	__le64	s_snapshot_r_blocks_count; /* reserved blocks for active
1165 					      snapshot's future use */
1166 	__le32	s_snapshot_list;	/* inode number of the head of the
1167 					   on-disk snapshot list */
1168 #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count)
1169 	__le32	s_error_count;		/* number of fs errors */
1170 	__le32	s_first_error_time;	/* first time an error happened */
1171 	__le32	s_first_error_ino;	/* inode involved in first error */
1172 	__le64	s_first_error_block;	/* block involved of first error */
1173 	__u8	s_first_error_func[32];	/* function where the error happened */
1174 	__le32	s_first_error_line;	/* line number where error happened */
1175 	__le32	s_last_error_time;	/* most recent time of an error */
1176 	__le32	s_last_error_ino;	/* inode involved in last error */
1177 	__le32	s_last_error_line;	/* line number where error happened */
1178 	__le64	s_last_error_block;	/* block involved of last error */
1179 	__u8	s_last_error_func[32];	/* function where the error happened */
1180 #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts)
1181 	__u8	s_mount_opts[64];
1182 	__le32	s_usr_quota_inum;	/* inode for tracking user quota */
1183 	__le32	s_grp_quota_inum;	/* inode for tracking group quota */
1184 	__le32	s_overhead_clusters;	/* overhead blocks/clusters in fs */
1185 	__le32	s_backup_bgs[2];	/* groups with sparse_super2 SBs */
1186 	__u8	s_encrypt_algos[4];	/* Encryption algorithms in use  */
1187 	__u8	s_encrypt_pw_salt[16];	/* Salt used for string2key algorithm */
1188 	__le32	s_lpf_ino;		/* Location of the lost+found inode */
1189 	__le32	s_prj_quota_inum;	/* inode for tracking project quota */
1190 	__le32	s_checksum_seed;	/* crc32c(uuid) if csum_seed set */
1191 	__le32	s_reserved[98];		/* Padding to the end of the block */
1192 	__le32	s_checksum;		/* crc32c(superblock) */
1193 };
1194 
1195 #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START)
1196 
1197 #ifdef __KERNEL__
1198 
1199 /*
1200  * run-time mount flags
1201  */
1202 #define EXT4_MF_MNTDIR_SAMPLED		0x0001
1203 #define EXT4_MF_FS_ABORTED		0x0002	/* Fatal error detected */
1204 #define EXT4_MF_TEST_DUMMY_ENCRYPTION	0x0004
1205 
1206 #ifdef CONFIG_EXT4_FS_ENCRYPTION
1207 #define DUMMY_ENCRYPTION_ENABLED(sbi) (unlikely((sbi)->s_mount_flags & \
1208 						EXT4_MF_TEST_DUMMY_ENCRYPTION))
1209 #else
1210 #define DUMMY_ENCRYPTION_ENABLED(sbi) (0)
1211 #endif
1212 
1213 /* Number of quota types we support */
1214 #define EXT4_MAXQUOTAS 2
1215 
1216 /*
1217  * fourth extended-fs super-block data in memory
1218  */
1219 struct ext4_sb_info {
1220 	unsigned long s_desc_size;	/* Size of a group descriptor in bytes */
1221 	unsigned long s_inodes_per_block;/* Number of inodes per block */
1222 	unsigned long s_blocks_per_group;/* Number of blocks in a group */
1223 	unsigned long s_clusters_per_group; /* Number of clusters in a group */
1224 	unsigned long s_inodes_per_group;/* Number of inodes in a group */
1225 	unsigned long s_itb_per_group;	/* Number of inode table blocks per group */
1226 	unsigned long s_gdb_count;	/* Number of group descriptor blocks */
1227 	unsigned long s_desc_per_block;	/* Number of group descriptors per block */
1228 	ext4_group_t s_groups_count;	/* Number of groups in the fs */
1229 	ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */
1230 	unsigned long s_overhead;  /* # of fs overhead clusters */
1231 	unsigned int s_cluster_ratio;	/* Number of blocks per cluster */
1232 	unsigned int s_cluster_bits;	/* log2 of s_cluster_ratio */
1233 	loff_t s_bitmap_maxbytes;	/* max bytes for bitmap files */
1234 	struct buffer_head * s_sbh;	/* Buffer containing the super block */
1235 	struct ext4_super_block *s_es;	/* Pointer to the super block in the buffer */
1236 	struct buffer_head **s_group_desc;
1237 	unsigned int s_mount_opt;
1238 	unsigned int s_mount_opt2;
1239 	unsigned int s_mount_flags;
1240 	unsigned int s_def_mount_opt;
1241 	ext4_fsblk_t s_sb_block;
1242 	atomic64_t s_resv_clusters;
1243 	kuid_t s_resuid;
1244 	kgid_t s_resgid;
1245 	unsigned short s_mount_state;
1246 	unsigned short s_pad;
1247 	int s_addr_per_block_bits;
1248 	int s_desc_per_block_bits;
1249 	int s_inode_size;
1250 	int s_first_ino;
1251 	unsigned int s_inode_readahead_blks;
1252 	unsigned int s_inode_goal;
1253 	spinlock_t s_next_gen_lock;
1254 	u32 s_next_generation;
1255 	u32 s_hash_seed[4];
1256 	int s_def_hash_version;
1257 	int s_hash_unsigned;	/* 3 if hash should be signed, 0 if not */
1258 	struct percpu_counter s_freeclusters_counter;
1259 	struct percpu_counter s_freeinodes_counter;
1260 	struct percpu_counter s_dirs_counter;
1261 	struct percpu_counter s_dirtyclusters_counter;
1262 	struct blockgroup_lock *s_blockgroup_lock;
1263 	struct proc_dir_entry *s_proc;
1264 	struct kobject s_kobj;
1265 	struct completion s_kobj_unregister;
1266 	struct super_block *s_sb;
1267 
1268 	/* Journaling */
1269 	struct journal_s *s_journal;
1270 	struct list_head s_orphan;
1271 	struct mutex s_orphan_lock;
1272 	unsigned long s_resize_flags;		/* Flags indicating if there
1273 						   is a resizer */
1274 	unsigned long s_commit_interval;
1275 	u32 s_max_batch_time;
1276 	u32 s_min_batch_time;
1277 	struct block_device *journal_bdev;
1278 #ifdef CONFIG_QUOTA
1279 	char *s_qf_names[EXT4_MAXQUOTAS];	/* Names of quota files with journalled quota */
1280 	int s_jquota_fmt;			/* Format of quota to use */
1281 #endif
1282 	unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */
1283 	struct rb_root system_blks;
1284 
1285 #ifdef EXTENTS_STATS
1286 	/* ext4 extents stats */
1287 	unsigned long s_ext_min;
1288 	unsigned long s_ext_max;
1289 	unsigned long s_depth_max;
1290 	spinlock_t s_ext_stats_lock;
1291 	unsigned long s_ext_blocks;
1292 	unsigned long s_ext_extents;
1293 #endif
1294 
1295 	/* for buddy allocator */
1296 	struct ext4_group_info ***s_group_info;
1297 	struct inode *s_buddy_cache;
1298 	spinlock_t s_md_lock;
1299 	unsigned short *s_mb_offsets;
1300 	unsigned int *s_mb_maxs;
1301 	unsigned int s_group_info_size;
1302 
1303 	/* tunables */
1304 	unsigned long s_stripe;
1305 	unsigned int s_mb_stream_request;
1306 	unsigned int s_mb_max_to_scan;
1307 	unsigned int s_mb_min_to_scan;
1308 	unsigned int s_mb_stats;
1309 	unsigned int s_mb_order2_reqs;
1310 	unsigned int s_mb_group_prealloc;
1311 	unsigned int s_max_dir_size_kb;
1312 	/* where last allocation was done - for stream allocation */
1313 	unsigned long s_mb_last_group;
1314 	unsigned long s_mb_last_start;
1315 
1316 	/* stats for buddy allocator */
1317 	atomic_t s_bal_reqs;	/* number of reqs with len > 1 */
1318 	atomic_t s_bal_success;	/* we found long enough chunks */
1319 	atomic_t s_bal_allocated;	/* in blocks */
1320 	atomic_t s_bal_ex_scanned;	/* total extents scanned */
1321 	atomic_t s_bal_goals;	/* goal hits */
1322 	atomic_t s_bal_breaks;	/* too long searches */
1323 	atomic_t s_bal_2orders;	/* 2^order hits */
1324 	spinlock_t s_bal_lock;
1325 	unsigned long s_mb_buddies_generated;
1326 	unsigned long long s_mb_generation_time;
1327 	atomic_t s_mb_lost_chunks;
1328 	atomic_t s_mb_preallocated;
1329 	atomic_t s_mb_discarded;
1330 	atomic_t s_lock_busy;
1331 
1332 	/* locality groups */
1333 	struct ext4_locality_group __percpu *s_locality_groups;
1334 
1335 	/* for write statistics */
1336 	unsigned long s_sectors_written_start;
1337 	u64 s_kbytes_written;
1338 
1339 	/* the size of zero-out chunk */
1340 	unsigned int s_extent_max_zeroout_kb;
1341 
1342 	unsigned int s_log_groups_per_flex;
1343 	struct flex_groups *s_flex_groups;
1344 	ext4_group_t s_flex_groups_allocated;
1345 
1346 	/* workqueue for reserved extent conversions (buffered io) */
1347 	struct workqueue_struct *rsv_conversion_wq;
1348 
1349 	/* timer for periodic error stats printing */
1350 	struct timer_list s_err_report;
1351 
1352 	/* Lazy inode table initialization info */
1353 	struct ext4_li_request *s_li_request;
1354 	/* Wait multiplier for lazy initialization thread */
1355 	unsigned int s_li_wait_mult;
1356 
1357 	/* Kernel thread for multiple mount protection */
1358 	struct task_struct *s_mmp_tsk;
1359 
1360 	/* record the last minlen when FITRIM is called. */
1361 	atomic_t s_last_trim_minblks;
1362 
1363 	/* Reference to checksum algorithm driver via cryptoapi */
1364 	struct crypto_shash *s_chksum_driver;
1365 
1366 	/* Precomputed FS UUID checksum for seeding other checksums */
1367 	__u32 s_csum_seed;
1368 
1369 	/* Reclaim extents from extent status tree */
1370 	struct shrinker s_es_shrinker;
1371 	struct list_head s_es_list;	/* List of inodes with reclaimable extents */
1372 	long s_es_nr_inode;
1373 	struct ext4_es_stats s_es_stats;
1374 	struct mb_cache *s_mb_cache;
1375 	spinlock_t s_es_lock ____cacheline_aligned_in_smp;
1376 
1377 	/* Ratelimit ext4 messages. */
1378 	struct ratelimit_state s_err_ratelimit_state;
1379 	struct ratelimit_state s_warning_ratelimit_state;
1380 	struct ratelimit_state s_msg_ratelimit_state;
1381 };
1382 
1383 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb)
1384 {
1385 	return sb->s_fs_info;
1386 }
1387 static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
1388 {
1389 	return container_of(inode, struct ext4_inode_info, vfs_inode);
1390 }
1391 
1392 static inline struct timespec ext4_current_time(struct inode *inode)
1393 {
1394 	return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ?
1395 		current_fs_time(inode->i_sb) : CURRENT_TIME_SEC;
1396 }
1397 
1398 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
1399 {
1400 	return ino == EXT4_ROOT_INO ||
1401 		ino == EXT4_USR_QUOTA_INO ||
1402 		ino == EXT4_GRP_QUOTA_INO ||
1403 		ino == EXT4_BOOT_LOADER_INO ||
1404 		ino == EXT4_JOURNAL_INO ||
1405 		ino == EXT4_RESIZE_INO ||
1406 		(ino >= EXT4_FIRST_INO(sb) &&
1407 		 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
1408 }
1409 
1410 static inline void ext4_set_io_unwritten_flag(struct inode *inode,
1411 					      struct ext4_io_end *io_end)
1412 {
1413 	if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) {
1414 		io_end->flag |= EXT4_IO_END_UNWRITTEN;
1415 		atomic_inc(&EXT4_I(inode)->i_unwritten);
1416 	}
1417 }
1418 
1419 static inline ext4_io_end_t *ext4_inode_aio(struct inode *inode)
1420 {
1421 	return inode->i_private;
1422 }
1423 
1424 static inline void ext4_inode_aio_set(struct inode *inode, ext4_io_end_t *io)
1425 {
1426 	inode->i_private = io;
1427 }
1428 
1429 /*
1430  * Inode dynamic state flags
1431  */
1432 enum {
1433 	EXT4_STATE_JDATA,		/* journaled data exists */
1434 	EXT4_STATE_NEW,			/* inode is newly created */
1435 	EXT4_STATE_XATTR,		/* has in-inode xattrs */
1436 	EXT4_STATE_NO_EXPAND,		/* No space for expansion */
1437 	EXT4_STATE_DA_ALLOC_CLOSE,	/* Alloc DA blks on close */
1438 	EXT4_STATE_EXT_MIGRATE,		/* Inode is migrating */
1439 	EXT4_STATE_DIO_UNWRITTEN,	/* need convert on dio done*/
1440 	EXT4_STATE_NEWENTRY,		/* File just added to dir */
1441 	EXT4_STATE_DIOREAD_LOCK,	/* Disable support for dio read
1442 					   nolocking */
1443 	EXT4_STATE_MAY_INLINE_DATA,	/* may have in-inode data */
1444 	EXT4_STATE_ORDERED_MODE,	/* data=ordered mode */
1445 	EXT4_STATE_EXT_PRECACHED,	/* extents have been precached */
1446 };
1447 
1448 #define EXT4_INODE_BIT_FNS(name, field, offset)				\
1449 static inline int ext4_test_inode_##name(struct inode *inode, int bit)	\
1450 {									\
1451 	return test_bit(bit + (offset), &EXT4_I(inode)->i_##field);	\
1452 }									\
1453 static inline void ext4_set_inode_##name(struct inode *inode, int bit)	\
1454 {									\
1455 	set_bit(bit + (offset), &EXT4_I(inode)->i_##field);		\
1456 }									\
1457 static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \
1458 {									\
1459 	clear_bit(bit + (offset), &EXT4_I(inode)->i_##field);		\
1460 }
1461 
1462 /* Add these declarations here only so that these functions can be
1463  * found by name.  Otherwise, they are very hard to locate. */
1464 static inline int ext4_test_inode_flag(struct inode *inode, int bit);
1465 static inline void ext4_set_inode_flag(struct inode *inode, int bit);
1466 static inline void ext4_clear_inode_flag(struct inode *inode, int bit);
1467 EXT4_INODE_BIT_FNS(flag, flags, 0)
1468 
1469 /* Add these declarations here only so that these functions can be
1470  * found by name.  Otherwise, they are very hard to locate. */
1471 static inline int ext4_test_inode_state(struct inode *inode, int bit);
1472 static inline void ext4_set_inode_state(struct inode *inode, int bit);
1473 static inline void ext4_clear_inode_state(struct inode *inode, int bit);
1474 #if (BITS_PER_LONG < 64)
1475 EXT4_INODE_BIT_FNS(state, state_flags, 0)
1476 
1477 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1478 {
1479 	(ei)->i_state_flags = 0;
1480 }
1481 #else
1482 EXT4_INODE_BIT_FNS(state, flags, 32)
1483 
1484 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1485 {
1486 	/* We depend on the fact that callers will set i_flags */
1487 }
1488 #endif
1489 #else
1490 /* Assume that user mode programs are passing in an ext4fs superblock, not
1491  * a kernel struct super_block.  This will allow us to call the feature-test
1492  * macros from user land. */
1493 #define EXT4_SB(sb)	(sb)
1494 #endif
1495 
1496 /*
1497  * Returns true if the inode is inode is encrypted
1498  */
1499 static inline int ext4_encrypted_inode(struct inode *inode)
1500 {
1501 #ifdef CONFIG_EXT4_FS_ENCRYPTION
1502 	return ext4_test_inode_flag(inode, EXT4_INODE_ENCRYPT);
1503 #else
1504 	return 0;
1505 #endif
1506 }
1507 
1508 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
1509 
1510 /*
1511  * Codes for operating systems
1512  */
1513 #define EXT4_OS_LINUX		0
1514 #define EXT4_OS_HURD		1
1515 #define EXT4_OS_MASIX		2
1516 #define EXT4_OS_FREEBSD		3
1517 #define EXT4_OS_LITES		4
1518 
1519 /*
1520  * Revision levels
1521  */
1522 #define EXT4_GOOD_OLD_REV	0	/* The good old (original) format */
1523 #define EXT4_DYNAMIC_REV	1	/* V2 format w/ dynamic inode sizes */
1524 
1525 #define EXT4_CURRENT_REV	EXT4_GOOD_OLD_REV
1526 #define EXT4_MAX_SUPP_REV	EXT4_DYNAMIC_REV
1527 
1528 #define EXT4_GOOD_OLD_INODE_SIZE 128
1529 
1530 /*
1531  * Feature set definitions
1532  */
1533 
1534 /* Use the ext4_{has,set,clear}_feature_* helpers; these will be removed */
1535 #define EXT4_HAS_COMPAT_FEATURE(sb,mask)			\
1536 	((EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask)) != 0)
1537 #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask)			\
1538 	((EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask)) != 0)
1539 #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask)			\
1540 	((EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask)) != 0)
1541 #define EXT4_SET_COMPAT_FEATURE(sb,mask)			\
1542 	EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
1543 #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask)			\
1544 	EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
1545 #define EXT4_SET_INCOMPAT_FEATURE(sb,mask)			\
1546 	EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
1547 #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask)			\
1548 	EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
1549 #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask)			\
1550 	EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
1551 #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask)			\
1552 	EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
1553 
1554 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC	0x0001
1555 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES	0x0002
1556 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL		0x0004
1557 #define EXT4_FEATURE_COMPAT_EXT_ATTR		0x0008
1558 #define EXT4_FEATURE_COMPAT_RESIZE_INODE	0x0010
1559 #define EXT4_FEATURE_COMPAT_DIR_INDEX		0x0020
1560 #define EXT4_FEATURE_COMPAT_SPARSE_SUPER2	0x0200
1561 
1562 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER	0x0001
1563 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE	0x0002
1564 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR	0x0004
1565 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE        0x0008
1566 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM		0x0010
1567 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK	0x0020
1568 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE	0x0040
1569 #define EXT4_FEATURE_RO_COMPAT_QUOTA		0x0100
1570 #define EXT4_FEATURE_RO_COMPAT_BIGALLOC		0x0200
1571 /*
1572  * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM).  When
1573  * METADATA_CSUM is set, group descriptor checksums use the same algorithm as
1574  * all other data structures' checksums.  However, the METADATA_CSUM and
1575  * GDT_CSUM bits are mutually exclusive.
1576  */
1577 #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM	0x0400
1578 #define EXT4_FEATURE_RO_COMPAT_READONLY		0x1000
1579 #define EXT4_FEATURE_RO_COMPAT_PROJECT		0x2000
1580 
1581 #define EXT4_FEATURE_INCOMPAT_COMPRESSION	0x0001
1582 #define EXT4_FEATURE_INCOMPAT_FILETYPE		0x0002
1583 #define EXT4_FEATURE_INCOMPAT_RECOVER		0x0004 /* Needs recovery */
1584 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV	0x0008 /* Journal device */
1585 #define EXT4_FEATURE_INCOMPAT_META_BG		0x0010
1586 #define EXT4_FEATURE_INCOMPAT_EXTENTS		0x0040 /* extents support */
1587 #define EXT4_FEATURE_INCOMPAT_64BIT		0x0080
1588 #define EXT4_FEATURE_INCOMPAT_MMP               0x0100
1589 #define EXT4_FEATURE_INCOMPAT_FLEX_BG		0x0200
1590 #define EXT4_FEATURE_INCOMPAT_EA_INODE		0x0400 /* EA in inode */
1591 #define EXT4_FEATURE_INCOMPAT_DIRDATA		0x1000 /* data in dirent */
1592 #define EXT4_FEATURE_INCOMPAT_CSUM_SEED		0x2000
1593 #define EXT4_FEATURE_INCOMPAT_LARGEDIR		0x4000 /* >2GB or 3-lvl htree */
1594 #define EXT4_FEATURE_INCOMPAT_INLINE_DATA	0x8000 /* data in inode */
1595 #define EXT4_FEATURE_INCOMPAT_ENCRYPT		0x10000
1596 
1597 #define EXT4_FEATURE_COMPAT_FUNCS(name, flagname) \
1598 static inline bool ext4_has_feature_##name(struct super_block *sb) \
1599 { \
1600 	return ((EXT4_SB(sb)->s_es->s_feature_compat & \
1601 		cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname)) != 0); \
1602 } \
1603 static inline void ext4_set_feature_##name(struct super_block *sb) \
1604 { \
1605 	EXT4_SB(sb)->s_es->s_feature_compat |= \
1606 		cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \
1607 } \
1608 static inline void ext4_clear_feature_##name(struct super_block *sb) \
1609 { \
1610 	EXT4_SB(sb)->s_es->s_feature_compat &= \
1611 		~cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \
1612 }
1613 
1614 #define EXT4_FEATURE_RO_COMPAT_FUNCS(name, flagname) \
1615 static inline bool ext4_has_feature_##name(struct super_block *sb) \
1616 { \
1617 	return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \
1618 		cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname)) != 0); \
1619 } \
1620 static inline void ext4_set_feature_##name(struct super_block *sb) \
1621 { \
1622 	EXT4_SB(sb)->s_es->s_feature_ro_compat |= \
1623 		cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \
1624 } \
1625 static inline void ext4_clear_feature_##name(struct super_block *sb) \
1626 { \
1627 	EXT4_SB(sb)->s_es->s_feature_ro_compat &= \
1628 		~cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \
1629 }
1630 
1631 #define EXT4_FEATURE_INCOMPAT_FUNCS(name, flagname) \
1632 static inline bool ext4_has_feature_##name(struct super_block *sb) \
1633 { \
1634 	return ((EXT4_SB(sb)->s_es->s_feature_incompat & \
1635 		cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname)) != 0); \
1636 } \
1637 static inline void ext4_set_feature_##name(struct super_block *sb) \
1638 { \
1639 	EXT4_SB(sb)->s_es->s_feature_incompat |= \
1640 		cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \
1641 } \
1642 static inline void ext4_clear_feature_##name(struct super_block *sb) \
1643 { \
1644 	EXT4_SB(sb)->s_es->s_feature_incompat &= \
1645 		~cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \
1646 }
1647 
1648 EXT4_FEATURE_COMPAT_FUNCS(dir_prealloc,		DIR_PREALLOC)
1649 EXT4_FEATURE_COMPAT_FUNCS(imagic_inodes,	IMAGIC_INODES)
1650 EXT4_FEATURE_COMPAT_FUNCS(journal,		HAS_JOURNAL)
1651 EXT4_FEATURE_COMPAT_FUNCS(xattr,		EXT_ATTR)
1652 EXT4_FEATURE_COMPAT_FUNCS(resize_inode,		RESIZE_INODE)
1653 EXT4_FEATURE_COMPAT_FUNCS(dir_index,		DIR_INDEX)
1654 EXT4_FEATURE_COMPAT_FUNCS(sparse_super2,	SPARSE_SUPER2)
1655 
1656 EXT4_FEATURE_RO_COMPAT_FUNCS(sparse_super,	SPARSE_SUPER)
1657 EXT4_FEATURE_RO_COMPAT_FUNCS(large_file,	LARGE_FILE)
1658 EXT4_FEATURE_RO_COMPAT_FUNCS(btree_dir,		BTREE_DIR)
1659 EXT4_FEATURE_RO_COMPAT_FUNCS(huge_file,		HUGE_FILE)
1660 EXT4_FEATURE_RO_COMPAT_FUNCS(gdt_csum,		GDT_CSUM)
1661 EXT4_FEATURE_RO_COMPAT_FUNCS(dir_nlink,		DIR_NLINK)
1662 EXT4_FEATURE_RO_COMPAT_FUNCS(extra_isize,	EXTRA_ISIZE)
1663 EXT4_FEATURE_RO_COMPAT_FUNCS(quota,		QUOTA)
1664 EXT4_FEATURE_RO_COMPAT_FUNCS(bigalloc,		BIGALLOC)
1665 EXT4_FEATURE_RO_COMPAT_FUNCS(metadata_csum,	METADATA_CSUM)
1666 EXT4_FEATURE_RO_COMPAT_FUNCS(readonly,		READONLY)
1667 EXT4_FEATURE_RO_COMPAT_FUNCS(project,		PROJECT)
1668 
1669 EXT4_FEATURE_INCOMPAT_FUNCS(compression,	COMPRESSION)
1670 EXT4_FEATURE_INCOMPAT_FUNCS(filetype,		FILETYPE)
1671 EXT4_FEATURE_INCOMPAT_FUNCS(journal_needs_recovery,	RECOVER)
1672 EXT4_FEATURE_INCOMPAT_FUNCS(journal_dev,	JOURNAL_DEV)
1673 EXT4_FEATURE_INCOMPAT_FUNCS(meta_bg,		META_BG)
1674 EXT4_FEATURE_INCOMPAT_FUNCS(extents,		EXTENTS)
1675 EXT4_FEATURE_INCOMPAT_FUNCS(64bit,		64BIT)
1676 EXT4_FEATURE_INCOMPAT_FUNCS(mmp,		MMP)
1677 EXT4_FEATURE_INCOMPAT_FUNCS(flex_bg,		FLEX_BG)
1678 EXT4_FEATURE_INCOMPAT_FUNCS(ea_inode,		EA_INODE)
1679 EXT4_FEATURE_INCOMPAT_FUNCS(dirdata,		DIRDATA)
1680 EXT4_FEATURE_INCOMPAT_FUNCS(csum_seed,		CSUM_SEED)
1681 EXT4_FEATURE_INCOMPAT_FUNCS(largedir,		LARGEDIR)
1682 EXT4_FEATURE_INCOMPAT_FUNCS(inline_data,	INLINE_DATA)
1683 EXT4_FEATURE_INCOMPAT_FUNCS(encrypt,		ENCRYPT)
1684 
1685 #define EXT2_FEATURE_COMPAT_SUPP	EXT4_FEATURE_COMPAT_EXT_ATTR
1686 #define EXT2_FEATURE_INCOMPAT_SUPP	(EXT4_FEATURE_INCOMPAT_FILETYPE| \
1687 					 EXT4_FEATURE_INCOMPAT_META_BG)
1688 #define EXT2_FEATURE_RO_COMPAT_SUPP	(EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1689 					 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1690 					 EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
1691 
1692 #define EXT3_FEATURE_COMPAT_SUPP	EXT4_FEATURE_COMPAT_EXT_ATTR
1693 #define EXT3_FEATURE_INCOMPAT_SUPP	(EXT4_FEATURE_INCOMPAT_FILETYPE| \
1694 					 EXT4_FEATURE_INCOMPAT_RECOVER| \
1695 					 EXT4_FEATURE_INCOMPAT_META_BG)
1696 #define EXT3_FEATURE_RO_COMPAT_SUPP	(EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1697 					 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1698 					 EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
1699 
1700 #define EXT4_FEATURE_COMPAT_SUPP	EXT4_FEATURE_COMPAT_EXT_ATTR
1701 #define EXT4_FEATURE_INCOMPAT_SUPP	(EXT4_FEATURE_INCOMPAT_FILETYPE| \
1702 					 EXT4_FEATURE_INCOMPAT_RECOVER| \
1703 					 EXT4_FEATURE_INCOMPAT_META_BG| \
1704 					 EXT4_FEATURE_INCOMPAT_EXTENTS| \
1705 					 EXT4_FEATURE_INCOMPAT_64BIT| \
1706 					 EXT4_FEATURE_INCOMPAT_FLEX_BG| \
1707 					 EXT4_FEATURE_INCOMPAT_MMP | \
1708 					 EXT4_FEATURE_INCOMPAT_INLINE_DATA | \
1709 					 EXT4_FEATURE_INCOMPAT_ENCRYPT | \
1710 					 EXT4_FEATURE_INCOMPAT_CSUM_SEED)
1711 #define EXT4_FEATURE_RO_COMPAT_SUPP	(EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1712 					 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1713 					 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
1714 					 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
1715 					 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
1716 					 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
1717 					 EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\
1718 					 EXT4_FEATURE_RO_COMPAT_BIGALLOC |\
1719 					 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\
1720 					 EXT4_FEATURE_RO_COMPAT_QUOTA)
1721 
1722 #define EXTN_FEATURE_FUNCS(ver) \
1723 static inline bool ext4_has_unknown_ext##ver##_compat_features(struct super_block *sb) \
1724 { \
1725 	return ((EXT4_SB(sb)->s_es->s_feature_compat & \
1726 		cpu_to_le32(~EXT##ver##_FEATURE_COMPAT_SUPP)) != 0); \
1727 } \
1728 static inline bool ext4_has_unknown_ext##ver##_ro_compat_features(struct super_block *sb) \
1729 { \
1730 	return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \
1731 		cpu_to_le32(~EXT##ver##_FEATURE_RO_COMPAT_SUPP)) != 0); \
1732 } \
1733 static inline bool ext4_has_unknown_ext##ver##_incompat_features(struct super_block *sb) \
1734 { \
1735 	return ((EXT4_SB(sb)->s_es->s_feature_incompat & \
1736 		cpu_to_le32(~EXT##ver##_FEATURE_INCOMPAT_SUPP)) != 0); \
1737 }
1738 
1739 EXTN_FEATURE_FUNCS(2)
1740 EXTN_FEATURE_FUNCS(3)
1741 EXTN_FEATURE_FUNCS(4)
1742 
1743 static inline bool ext4_has_compat_features(struct super_block *sb)
1744 {
1745 	return (EXT4_SB(sb)->s_es->s_feature_compat != 0);
1746 }
1747 static inline bool ext4_has_ro_compat_features(struct super_block *sb)
1748 {
1749 	return (EXT4_SB(sb)->s_es->s_feature_ro_compat != 0);
1750 }
1751 static inline bool ext4_has_incompat_features(struct super_block *sb)
1752 {
1753 	return (EXT4_SB(sb)->s_es->s_feature_incompat != 0);
1754 }
1755 
1756 /*
1757  * Default values for user and/or group using reserved blocks
1758  */
1759 #define	EXT4_DEF_RESUID		0
1760 #define	EXT4_DEF_RESGID		0
1761 
1762 #define EXT4_DEF_INODE_READAHEAD_BLKS	32
1763 
1764 /*
1765  * Default mount options
1766  */
1767 #define EXT4_DEFM_DEBUG		0x0001
1768 #define EXT4_DEFM_BSDGROUPS	0x0002
1769 #define EXT4_DEFM_XATTR_USER	0x0004
1770 #define EXT4_DEFM_ACL		0x0008
1771 #define EXT4_DEFM_UID16		0x0010
1772 #define EXT4_DEFM_JMODE		0x0060
1773 #define EXT4_DEFM_JMODE_DATA	0x0020
1774 #define EXT4_DEFM_JMODE_ORDERED	0x0040
1775 #define EXT4_DEFM_JMODE_WBACK	0x0060
1776 #define EXT4_DEFM_NOBARRIER	0x0100
1777 #define EXT4_DEFM_BLOCK_VALIDITY 0x0200
1778 #define EXT4_DEFM_DISCARD	0x0400
1779 #define EXT4_DEFM_NODELALLOC	0x0800
1780 
1781 /*
1782  * Default journal batch times
1783  */
1784 #define EXT4_DEF_MIN_BATCH_TIME	0
1785 #define EXT4_DEF_MAX_BATCH_TIME	15000 /* 15ms */
1786 
1787 /*
1788  * Minimum number of groups in a flexgroup before we separate out
1789  * directories into the first block group of a flexgroup
1790  */
1791 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME	4
1792 
1793 /*
1794  * Structure of a directory entry
1795  */
1796 #define EXT4_NAME_LEN 255
1797 
1798 struct ext4_dir_entry {
1799 	__le32	inode;			/* Inode number */
1800 	__le16	rec_len;		/* Directory entry length */
1801 	__le16	name_len;		/* Name length */
1802 	char	name[EXT4_NAME_LEN];	/* File name */
1803 };
1804 
1805 /*
1806  * The new version of the directory entry.  Since EXT4 structures are
1807  * stored in intel byte order, and the name_len field could never be
1808  * bigger than 255 chars, it's safe to reclaim the extra byte for the
1809  * file_type field.
1810  */
1811 struct ext4_dir_entry_2 {
1812 	__le32	inode;			/* Inode number */
1813 	__le16	rec_len;		/* Directory entry length */
1814 	__u8	name_len;		/* Name length */
1815 	__u8	file_type;
1816 	char	name[EXT4_NAME_LEN];	/* File name */
1817 };
1818 
1819 /*
1820  * This is a bogus directory entry at the end of each leaf block that
1821  * records checksums.
1822  */
1823 struct ext4_dir_entry_tail {
1824 	__le32	det_reserved_zero1;	/* Pretend to be unused */
1825 	__le16	det_rec_len;		/* 12 */
1826 	__u8	det_reserved_zero2;	/* Zero name length */
1827 	__u8	det_reserved_ft;	/* 0xDE, fake file type */
1828 	__le32	det_checksum;		/* crc32c(uuid+inum+dirblock) */
1829 };
1830 
1831 #define EXT4_DIRENT_TAIL(block, blocksize) \
1832 	((struct ext4_dir_entry_tail *)(((void *)(block)) + \
1833 					((blocksize) - \
1834 					 sizeof(struct ext4_dir_entry_tail))))
1835 
1836 /*
1837  * Ext4 directory file types.  Only the low 3 bits are used.  The
1838  * other bits are reserved for now.
1839  */
1840 #define EXT4_FT_UNKNOWN		0
1841 #define EXT4_FT_REG_FILE	1
1842 #define EXT4_FT_DIR		2
1843 #define EXT4_FT_CHRDEV		3
1844 #define EXT4_FT_BLKDEV		4
1845 #define EXT4_FT_FIFO		5
1846 #define EXT4_FT_SOCK		6
1847 #define EXT4_FT_SYMLINK		7
1848 
1849 #define EXT4_FT_MAX		8
1850 
1851 #define EXT4_FT_DIR_CSUM	0xDE
1852 
1853 /*
1854  * EXT4_DIR_PAD defines the directory entries boundaries
1855  *
1856  * NOTE: It must be a multiple of 4
1857  */
1858 #define EXT4_DIR_PAD			4
1859 #define EXT4_DIR_ROUND			(EXT4_DIR_PAD - 1)
1860 #define EXT4_DIR_REC_LEN(name_len)	(((name_len) + 8 + EXT4_DIR_ROUND) & \
1861 					 ~EXT4_DIR_ROUND)
1862 #define EXT4_MAX_REC_LEN		((1<<16)-1)
1863 
1864 /*
1865  * If we ever get support for fs block sizes > page_size, we'll need
1866  * to remove the #if statements in the next two functions...
1867  */
1868 static inline unsigned int
1869 ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize)
1870 {
1871 	unsigned len = le16_to_cpu(dlen);
1872 
1873 #if (PAGE_CACHE_SIZE >= 65536)
1874 	if (len == EXT4_MAX_REC_LEN || len == 0)
1875 		return blocksize;
1876 	return (len & 65532) | ((len & 3) << 16);
1877 #else
1878 	return len;
1879 #endif
1880 }
1881 
1882 static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize)
1883 {
1884 	if ((len > blocksize) || (blocksize > (1 << 18)) || (len & 3))
1885 		BUG();
1886 #if (PAGE_CACHE_SIZE >= 65536)
1887 	if (len < 65536)
1888 		return cpu_to_le16(len);
1889 	if (len == blocksize) {
1890 		if (blocksize == 65536)
1891 			return cpu_to_le16(EXT4_MAX_REC_LEN);
1892 		else
1893 			return cpu_to_le16(0);
1894 	}
1895 	return cpu_to_le16((len & 65532) | ((len >> 16) & 3));
1896 #else
1897 	return cpu_to_le16(len);
1898 #endif
1899 }
1900 
1901 /*
1902  * Hash Tree Directory indexing
1903  * (c) Daniel Phillips, 2001
1904  */
1905 
1906 #define is_dx(dir) (ext4_has_feature_dir_index((dir)->i_sb) && \
1907 		    ext4_test_inode_flag((dir), EXT4_INODE_INDEX))
1908 #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX)
1909 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
1910 
1911 /* Legal values for the dx_root hash_version field: */
1912 
1913 #define DX_HASH_LEGACY		0
1914 #define DX_HASH_HALF_MD4	1
1915 #define DX_HASH_TEA		2
1916 #define DX_HASH_LEGACY_UNSIGNED	3
1917 #define DX_HASH_HALF_MD4_UNSIGNED	4
1918 #define DX_HASH_TEA_UNSIGNED		5
1919 
1920 static inline u32 ext4_chksum(struct ext4_sb_info *sbi, u32 crc,
1921 			      const void *address, unsigned int length)
1922 {
1923 	struct {
1924 		struct shash_desc shash;
1925 		char ctx[4];
1926 	} desc;
1927 	int err;
1928 
1929 	BUG_ON(crypto_shash_descsize(sbi->s_chksum_driver)!=sizeof(desc.ctx));
1930 
1931 	desc.shash.tfm = sbi->s_chksum_driver;
1932 	desc.shash.flags = 0;
1933 	*(u32 *)desc.ctx = crc;
1934 
1935 	err = crypto_shash_update(&desc.shash, address, length);
1936 	BUG_ON(err);
1937 
1938 	return *(u32 *)desc.ctx;
1939 }
1940 
1941 #ifdef __KERNEL__
1942 
1943 /* hash info structure used by the directory hash */
1944 struct dx_hash_info
1945 {
1946 	u32		hash;
1947 	u32		minor_hash;
1948 	int		hash_version;
1949 	u32		*seed;
1950 };
1951 
1952 
1953 /* 32 and 64 bit signed EOF for dx directories */
1954 #define EXT4_HTREE_EOF_32BIT   ((1UL  << (32 - 1)) - 1)
1955 #define EXT4_HTREE_EOF_64BIT   ((1ULL << (64 - 1)) - 1)
1956 
1957 
1958 /*
1959  * Control parameters used by ext4_htree_next_block
1960  */
1961 #define HASH_NB_ALWAYS		1
1962 
1963 struct ext4_filename {
1964 	const struct qstr *usr_fname;
1965 	struct ext4_str disk_name;
1966 	struct dx_hash_info hinfo;
1967 #ifdef CONFIG_EXT4_FS_ENCRYPTION
1968 	struct ext4_str crypto_buf;
1969 #endif
1970 };
1971 
1972 #define fname_name(p) ((p)->disk_name.name)
1973 #define fname_len(p)  ((p)->disk_name.len)
1974 
1975 /*
1976  * Describe an inode's exact location on disk and in memory
1977  */
1978 struct ext4_iloc
1979 {
1980 	struct buffer_head *bh;
1981 	unsigned long offset;
1982 	ext4_group_t block_group;
1983 };
1984 
1985 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
1986 {
1987 	return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
1988 }
1989 
1990 /*
1991  * This structure is stuffed into the struct file's private_data field
1992  * for directories.  It is where we put information so that we can do
1993  * readdir operations in hash tree order.
1994  */
1995 struct dir_private_info {
1996 	struct rb_root	root;
1997 	struct rb_node	*curr_node;
1998 	struct fname	*extra_fname;
1999 	loff_t		last_pos;
2000 	__u32		curr_hash;
2001 	__u32		curr_minor_hash;
2002 	__u32		next_hash;
2003 };
2004 
2005 /* calculate the first block number of the group */
2006 static inline ext4_fsblk_t
2007 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no)
2008 {
2009 	return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
2010 		le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
2011 }
2012 
2013 /*
2014  * Special error return code only used by dx_probe() and its callers.
2015  */
2016 #define ERR_BAD_DX_DIR	(-(MAX_ERRNO - 1))
2017 
2018 /*
2019  * Timeout and state flag for lazy initialization inode thread.
2020  */
2021 #define EXT4_DEF_LI_WAIT_MULT			10
2022 #define EXT4_DEF_LI_MAX_START_DELAY		5
2023 #define EXT4_LAZYINIT_QUIT			0x0001
2024 #define EXT4_LAZYINIT_RUNNING			0x0002
2025 
2026 /*
2027  * Lazy inode table initialization info
2028  */
2029 struct ext4_lazy_init {
2030 	unsigned long		li_state;
2031 	struct list_head	li_request_list;
2032 	struct mutex		li_list_mtx;
2033 };
2034 
2035 struct ext4_li_request {
2036 	struct super_block	*lr_super;
2037 	struct ext4_sb_info	*lr_sbi;
2038 	ext4_group_t		lr_next_group;
2039 	struct list_head	lr_request;
2040 	unsigned long		lr_next_sched;
2041 	unsigned long		lr_timeout;
2042 };
2043 
2044 struct ext4_features {
2045 	struct kobject f_kobj;
2046 	struct completion f_kobj_unregister;
2047 };
2048 
2049 /*
2050  * This structure will be used for multiple mount protection. It will be
2051  * written into the block number saved in the s_mmp_block field in the
2052  * superblock. Programs that check MMP should assume that if
2053  * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe
2054  * to use the filesystem, regardless of how old the timestamp is.
2055  */
2056 #define EXT4_MMP_MAGIC     0x004D4D50U /* ASCII for MMP */
2057 #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */
2058 #define EXT4_MMP_SEQ_FSCK  0xE24D4D50U /* mmp_seq value when being fscked */
2059 #define EXT4_MMP_SEQ_MAX   0xE24D4D4FU /* maximum valid mmp_seq value */
2060 
2061 struct mmp_struct {
2062 	__le32	mmp_magic;		/* Magic number for MMP */
2063 	__le32	mmp_seq;		/* Sequence no. updated periodically */
2064 
2065 	/*
2066 	 * mmp_time, mmp_nodename & mmp_bdevname are only used for information
2067 	 * purposes and do not affect the correctness of the algorithm
2068 	 */
2069 	__le64	mmp_time;		/* Time last updated */
2070 	char	mmp_nodename[64];	/* Node which last updated MMP block */
2071 	char	mmp_bdevname[32];	/* Bdev which last updated MMP block */
2072 
2073 	/*
2074 	 * mmp_check_interval is used to verify if the MMP block has been
2075 	 * updated on the block device. The value is updated based on the
2076 	 * maximum time to write the MMP block during an update cycle.
2077 	 */
2078 	__le16	mmp_check_interval;
2079 
2080 	__le16	mmp_pad1;
2081 	__le32	mmp_pad2[226];
2082 	__le32	mmp_checksum;		/* crc32c(uuid+mmp_block) */
2083 };
2084 
2085 /* arguments passed to the mmp thread */
2086 struct mmpd_data {
2087 	struct buffer_head *bh; /* bh from initial read_mmp_block() */
2088 	struct super_block *sb;  /* super block of the fs */
2089 };
2090 
2091 /*
2092  * Check interval multiplier
2093  * The MMP block is written every update interval and initially checked every
2094  * update interval x the multiplier (the value is then adapted based on the
2095  * write latency). The reason is that writes can be delayed under load and we
2096  * don't want readers to incorrectly assume that the filesystem is no longer
2097  * in use.
2098  */
2099 #define EXT4_MMP_CHECK_MULT		2UL
2100 
2101 /*
2102  * Minimum interval for MMP checking in seconds.
2103  */
2104 #define EXT4_MMP_MIN_CHECK_INTERVAL	5UL
2105 
2106 /*
2107  * Maximum interval for MMP checking in seconds.
2108  */
2109 #define EXT4_MMP_MAX_CHECK_INTERVAL	300UL
2110 
2111 /*
2112  * Function prototypes
2113  */
2114 
2115 /*
2116  * Ok, these declarations are also in <linux/kernel.h> but none of the
2117  * ext4 source programs needs to include it so they are duplicated here.
2118  */
2119 # define NORET_TYPE	/**/
2120 # define ATTRIB_NORET	__attribute__((noreturn))
2121 # define NORET_AND	noreturn,
2122 
2123 /* bitmap.c */
2124 extern unsigned int ext4_count_free(char *bitmap, unsigned numchars);
2125 void ext4_inode_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
2126 				struct ext4_group_desc *gdp,
2127 				struct buffer_head *bh, int sz);
2128 int ext4_inode_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
2129 				  struct ext4_group_desc *gdp,
2130 				  struct buffer_head *bh, int sz);
2131 void ext4_block_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
2132 				struct ext4_group_desc *gdp,
2133 				struct buffer_head *bh);
2134 int ext4_block_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
2135 				  struct ext4_group_desc *gdp,
2136 				  struct buffer_head *bh);
2137 
2138 /* balloc.c */
2139 extern void ext4_get_group_no_and_offset(struct super_block *sb,
2140 					 ext4_fsblk_t blocknr,
2141 					 ext4_group_t *blockgrpp,
2142 					 ext4_grpblk_t *offsetp);
2143 extern ext4_group_t ext4_get_group_number(struct super_block *sb,
2144 					  ext4_fsblk_t block);
2145 
2146 extern unsigned int ext4_block_group(struct super_block *sb,
2147 			ext4_fsblk_t blocknr);
2148 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb,
2149 			ext4_fsblk_t blocknr);
2150 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group);
2151 extern unsigned long ext4_bg_num_gdb(struct super_block *sb,
2152 			ext4_group_t group);
2153 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,
2154 					 ext4_fsblk_t goal,
2155 					 unsigned int flags,
2156 					 unsigned long *count,
2157 					 int *errp);
2158 extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi,
2159 				    s64 nclusters, unsigned int flags);
2160 extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *);
2161 extern void ext4_check_blocks_bitmap(struct super_block *);
2162 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
2163 						    ext4_group_t block_group,
2164 						    struct buffer_head ** bh);
2165 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
2166 
2167 extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb,
2168 						ext4_group_t block_group);
2169 extern int ext4_wait_block_bitmap(struct super_block *sb,
2170 				  ext4_group_t block_group,
2171 				  struct buffer_head *bh);
2172 extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb,
2173 						  ext4_group_t block_group);
2174 extern unsigned ext4_free_clusters_after_init(struct super_block *sb,
2175 					      ext4_group_t block_group,
2176 					      struct ext4_group_desc *gdp);
2177 ext4_fsblk_t ext4_inode_to_goal_block(struct inode *);
2178 
2179 /* crypto_policy.c */
2180 int ext4_is_child_context_consistent_with_parent(struct inode *parent,
2181 						 struct inode *child);
2182 int ext4_inherit_context(struct inode *parent, struct inode *child);
2183 void ext4_to_hex(char *dst, char *src, size_t src_size);
2184 int ext4_process_policy(const struct ext4_encryption_policy *policy,
2185 			struct inode *inode);
2186 int ext4_get_policy(struct inode *inode,
2187 		    struct ext4_encryption_policy *policy);
2188 
2189 /* crypto.c */
2190 extern struct kmem_cache *ext4_crypt_info_cachep;
2191 bool ext4_valid_contents_enc_mode(uint32_t mode);
2192 uint32_t ext4_validate_encryption_key_size(uint32_t mode, uint32_t size);
2193 extern struct workqueue_struct *ext4_read_workqueue;
2194 struct ext4_crypto_ctx *ext4_get_crypto_ctx(struct inode *inode);
2195 void ext4_release_crypto_ctx(struct ext4_crypto_ctx *ctx);
2196 void ext4_restore_control_page(struct page *data_page);
2197 struct page *ext4_encrypt(struct inode *inode,
2198 			  struct page *plaintext_page);
2199 int ext4_decrypt(struct page *page);
2200 int ext4_encrypted_zeroout(struct inode *inode, struct ext4_extent *ex);
2201 
2202 #ifdef CONFIG_EXT4_FS_ENCRYPTION
2203 int ext4_init_crypto(void);
2204 void ext4_exit_crypto(void);
2205 static inline int ext4_sb_has_crypto(struct super_block *sb)
2206 {
2207 	return ext4_has_feature_encrypt(sb);
2208 }
2209 #else
2210 static inline int ext4_init_crypto(void) { return 0; }
2211 static inline void ext4_exit_crypto(void) { }
2212 static inline int ext4_sb_has_crypto(struct super_block *sb)
2213 {
2214 	return 0;
2215 }
2216 #endif
2217 
2218 /* crypto_fname.c */
2219 bool ext4_valid_filenames_enc_mode(uint32_t mode);
2220 u32 ext4_fname_crypto_round_up(u32 size, u32 blksize);
2221 unsigned ext4_fname_encrypted_size(struct inode *inode, u32 ilen);
2222 int ext4_fname_crypto_alloc_buffer(struct inode *inode,
2223 				   u32 ilen, struct ext4_str *crypto_str);
2224 int _ext4_fname_disk_to_usr(struct inode *inode,
2225 			    struct dx_hash_info *hinfo,
2226 			    const struct ext4_str *iname,
2227 			    struct ext4_str *oname);
2228 int ext4_fname_disk_to_usr(struct inode *inode,
2229 			   struct dx_hash_info *hinfo,
2230 			   const struct ext4_dir_entry_2 *de,
2231 			   struct ext4_str *oname);
2232 int ext4_fname_usr_to_disk(struct inode *inode,
2233 			   const struct qstr *iname,
2234 			   struct ext4_str *oname);
2235 #ifdef CONFIG_EXT4_FS_ENCRYPTION
2236 void ext4_fname_crypto_free_buffer(struct ext4_str *crypto_str);
2237 int ext4_fname_setup_filename(struct inode *dir, const struct qstr *iname,
2238 			      int lookup, struct ext4_filename *fname);
2239 void ext4_fname_free_filename(struct ext4_filename *fname);
2240 #else
2241 static inline
2242 int ext4_setup_fname_crypto(struct inode *inode)
2243 {
2244 	return 0;
2245 }
2246 static inline void ext4_fname_crypto_free_buffer(struct ext4_str *p) { }
2247 static inline int ext4_fname_setup_filename(struct inode *dir,
2248 				     const struct qstr *iname,
2249 				     int lookup, struct ext4_filename *fname)
2250 {
2251 	fname->usr_fname = iname;
2252 	fname->disk_name.name = (unsigned char *) iname->name;
2253 	fname->disk_name.len = iname->len;
2254 	return 0;
2255 }
2256 static inline void ext4_fname_free_filename(struct ext4_filename *fname) { }
2257 #endif
2258 
2259 
2260 /* crypto_key.c */
2261 void ext4_free_crypt_info(struct ext4_crypt_info *ci);
2262 void ext4_free_encryption_info(struct inode *inode, struct ext4_crypt_info *ci);
2263 int _ext4_get_encryption_info(struct inode *inode);
2264 
2265 #ifdef CONFIG_EXT4_FS_ENCRYPTION
2266 int ext4_has_encryption_key(struct inode *inode);
2267 
2268 static inline int ext4_get_encryption_info(struct inode *inode)
2269 {
2270 	struct ext4_crypt_info *ci = EXT4_I(inode)->i_crypt_info;
2271 
2272 	if (!ci ||
2273 	    (ci->ci_keyring_key &&
2274 	     (ci->ci_keyring_key->flags & ((1 << KEY_FLAG_INVALIDATED) |
2275 					   (1 << KEY_FLAG_REVOKED) |
2276 					   (1 << KEY_FLAG_DEAD)))))
2277 		return _ext4_get_encryption_info(inode);
2278 	return 0;
2279 }
2280 
2281 static inline struct ext4_crypt_info *ext4_encryption_info(struct inode *inode)
2282 {
2283 	return EXT4_I(inode)->i_crypt_info;
2284 }
2285 
2286 #else
2287 static inline int ext4_has_encryption_key(struct inode *inode)
2288 {
2289 	return 0;
2290 }
2291 static inline int ext4_get_encryption_info(struct inode *inode)
2292 {
2293 	return 0;
2294 }
2295 static inline struct ext4_crypt_info *ext4_encryption_info(struct inode *inode)
2296 {
2297 	return NULL;
2298 }
2299 #endif
2300 
2301 
2302 /* dir.c */
2303 extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *,
2304 				  struct file *,
2305 				  struct ext4_dir_entry_2 *,
2306 				  struct buffer_head *, char *, int,
2307 				  unsigned int);
2308 #define ext4_check_dir_entry(dir, filp, de, bh, buf, size, offset)	\
2309 	unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \
2310 					(de), (bh), (buf), (size), (offset)))
2311 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
2312 				__u32 minor_hash,
2313 				struct ext4_dir_entry_2 *dirent,
2314 				struct ext4_str *ent_name);
2315 extern void ext4_htree_free_dir_info(struct dir_private_info *p);
2316 extern int ext4_find_dest_de(struct inode *dir, struct inode *inode,
2317 			     struct buffer_head *bh,
2318 			     void *buf, int buf_size,
2319 			     struct ext4_filename *fname,
2320 			     struct ext4_dir_entry_2 **dest_de);
2321 int ext4_insert_dentry(struct inode *dir,
2322 		       struct inode *inode,
2323 		       struct ext4_dir_entry_2 *de,
2324 		       int buf_size,
2325 		       struct ext4_filename *fname);
2326 static inline void ext4_update_dx_flag(struct inode *inode)
2327 {
2328 	if (!ext4_has_feature_dir_index(inode->i_sb))
2329 		ext4_clear_inode_flag(inode, EXT4_INODE_INDEX);
2330 }
2331 static unsigned char ext4_filetype_table[] = {
2332 	DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK
2333 };
2334 
2335 static inline  unsigned char get_dtype(struct super_block *sb, int filetype)
2336 {
2337 	if (!ext4_has_feature_filetype(sb) || filetype >= EXT4_FT_MAX)
2338 		return DT_UNKNOWN;
2339 
2340 	return ext4_filetype_table[filetype];
2341 }
2342 extern int ext4_check_all_de(struct inode *dir, struct buffer_head *bh,
2343 			     void *buf, int buf_size);
2344 
2345 /* fsync.c */
2346 extern int ext4_sync_file(struct file *, loff_t, loff_t, int);
2347 
2348 /* hash.c */
2349 extern int ext4fs_dirhash(const char *name, int len, struct
2350 			  dx_hash_info *hinfo);
2351 
2352 /* ialloc.c */
2353 extern struct inode *__ext4_new_inode(handle_t *, struct inode *, umode_t,
2354 				      const struct qstr *qstr, __u32 goal,
2355 				      uid_t *owner, int handle_type,
2356 				      unsigned int line_no, int nblocks);
2357 
2358 #define ext4_new_inode(handle, dir, mode, qstr, goal, owner) \
2359 	__ext4_new_inode((handle), (dir), (mode), (qstr), (goal), (owner), \
2360 			 0, 0, 0)
2361 #define ext4_new_inode_start_handle(dir, mode, qstr, goal, owner, \
2362 				    type, nblocks)		    \
2363 	__ext4_new_inode(NULL, (dir), (mode), (qstr), (goal), (owner), \
2364 			 (type), __LINE__, (nblocks))
2365 
2366 
2367 extern void ext4_free_inode(handle_t *, struct inode *);
2368 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long);
2369 extern unsigned long ext4_count_free_inodes(struct super_block *);
2370 extern unsigned long ext4_count_dirs(struct super_block *);
2371 extern void ext4_check_inodes_bitmap(struct super_block *);
2372 extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap);
2373 extern int ext4_init_inode_table(struct super_block *sb,
2374 				 ext4_group_t group, int barrier);
2375 extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate);
2376 
2377 /* mballoc.c */
2378 extern const struct file_operations ext4_seq_mb_groups_fops;
2379 extern long ext4_mb_stats;
2380 extern long ext4_mb_max_to_scan;
2381 extern int ext4_mb_init(struct super_block *);
2382 extern int ext4_mb_release(struct super_block *);
2383 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *,
2384 				struct ext4_allocation_request *, int *);
2385 extern int ext4_mb_reserve_blocks(struct super_block *, int);
2386 extern void ext4_discard_preallocations(struct inode *);
2387 extern int __init ext4_init_mballoc(void);
2388 extern void ext4_exit_mballoc(void);
2389 extern void ext4_free_blocks(handle_t *handle, struct inode *inode,
2390 			     struct buffer_head *bh, ext4_fsblk_t block,
2391 			     unsigned long count, int flags);
2392 extern int ext4_mb_alloc_groupinfo(struct super_block *sb,
2393 				   ext4_group_t ngroups);
2394 extern int ext4_mb_add_groupinfo(struct super_block *sb,
2395 		ext4_group_t i, struct ext4_group_desc *desc);
2396 extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb,
2397 				ext4_fsblk_t block, unsigned long count);
2398 extern int ext4_trim_fs(struct super_block *, struct fstrim_range *);
2399 
2400 /* inode.c */
2401 int ext4_inode_is_fast_symlink(struct inode *inode);
2402 struct buffer_head *ext4_getblk(handle_t *, struct inode *, ext4_lblk_t, int);
2403 struct buffer_head *ext4_bread(handle_t *, struct inode *, ext4_lblk_t, int);
2404 int ext4_get_block_write(struct inode *inode, sector_t iblock,
2405 			 struct buffer_head *bh_result, int create);
2406 int ext4_get_block_dax(struct inode *inode, sector_t iblock,
2407 			 struct buffer_head *bh_result, int create);
2408 int ext4_get_block(struct inode *inode, sector_t iblock,
2409 				struct buffer_head *bh_result, int create);
2410 int ext4_da_get_block_prep(struct inode *inode, sector_t iblock,
2411 			   struct buffer_head *bh, int create);
2412 int ext4_walk_page_buffers(handle_t *handle,
2413 			   struct buffer_head *head,
2414 			   unsigned from,
2415 			   unsigned to,
2416 			   int *partial,
2417 			   int (*fn)(handle_t *handle,
2418 				     struct buffer_head *bh));
2419 int do_journal_get_write_access(handle_t *handle,
2420 				struct buffer_head *bh);
2421 #define FALL_BACK_TO_NONDELALLOC 1
2422 #define CONVERT_INLINE_DATA	 2
2423 
2424 extern struct inode *ext4_iget(struct super_block *, unsigned long);
2425 extern struct inode *ext4_iget_normal(struct super_block *, unsigned long);
2426 extern int  ext4_write_inode(struct inode *, struct writeback_control *);
2427 extern int  ext4_setattr(struct dentry *, struct iattr *);
2428 extern int  ext4_getattr(struct vfsmount *mnt, struct dentry *dentry,
2429 				struct kstat *stat);
2430 extern void ext4_evict_inode(struct inode *);
2431 extern void ext4_clear_inode(struct inode *);
2432 extern int  ext4_sync_inode(handle_t *, struct inode *);
2433 extern void ext4_dirty_inode(struct inode *, int);
2434 extern int ext4_change_inode_journal_flag(struct inode *, int);
2435 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
2436 extern int ext4_inode_attach_jinode(struct inode *inode);
2437 extern int ext4_can_truncate(struct inode *inode);
2438 extern void ext4_truncate(struct inode *);
2439 extern int ext4_punch_hole(struct inode *inode, loff_t offset, loff_t length);
2440 extern int ext4_truncate_restart_trans(handle_t *, struct inode *, int nblocks);
2441 extern void ext4_set_inode_flags(struct inode *);
2442 extern void ext4_get_inode_flags(struct ext4_inode_info *);
2443 extern int ext4_alloc_da_blocks(struct inode *inode);
2444 extern void ext4_set_aops(struct inode *inode);
2445 extern int ext4_writepage_trans_blocks(struct inode *);
2446 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks);
2447 extern int ext4_zero_partial_blocks(handle_t *handle, struct inode *inode,
2448 			     loff_t lstart, loff_t lend);
2449 extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf);
2450 extern qsize_t *ext4_get_reserved_space(struct inode *inode);
2451 extern void ext4_da_update_reserve_space(struct inode *inode,
2452 					int used, int quota_claim);
2453 
2454 /* indirect.c */
2455 extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode,
2456 				struct ext4_map_blocks *map, int flags);
2457 extern ssize_t ext4_ind_direct_IO(struct kiocb *iocb, struct iov_iter *iter,
2458 				  loff_t offset);
2459 extern int ext4_ind_calc_metadata_amount(struct inode *inode, sector_t lblock);
2460 extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks);
2461 extern void ext4_ind_truncate(handle_t *, struct inode *inode);
2462 extern int ext4_ind_remove_space(handle_t *handle, struct inode *inode,
2463 				 ext4_lblk_t start, ext4_lblk_t end);
2464 
2465 /* ioctl.c */
2466 extern long ext4_ioctl(struct file *, unsigned int, unsigned long);
2467 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long);
2468 
2469 /* migrate.c */
2470 extern int ext4_ext_migrate(struct inode *);
2471 extern int ext4_ind_migrate(struct inode *inode);
2472 
2473 /* namei.c */
2474 extern int ext4_dirent_csum_verify(struct inode *inode,
2475 				   struct ext4_dir_entry *dirent);
2476 extern int ext4_orphan_add(handle_t *, struct inode *);
2477 extern int ext4_orphan_del(handle_t *, struct inode *);
2478 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
2479 				__u32 start_minor_hash, __u32 *next_hash);
2480 extern int ext4_search_dir(struct buffer_head *bh,
2481 			   char *search_buf,
2482 			   int buf_size,
2483 			   struct inode *dir,
2484 			   struct ext4_filename *fname,
2485 			   const struct qstr *d_name,
2486 			   unsigned int offset,
2487 			   struct ext4_dir_entry_2 **res_dir);
2488 extern int ext4_generic_delete_entry(handle_t *handle,
2489 				     struct inode *dir,
2490 				     struct ext4_dir_entry_2 *de_del,
2491 				     struct buffer_head *bh,
2492 				     void *entry_buf,
2493 				     int buf_size,
2494 				     int csum_size);
2495 extern int ext4_empty_dir(struct inode *inode);
2496 
2497 /* resize.c */
2498 extern int ext4_group_add(struct super_block *sb,
2499 				struct ext4_new_group_data *input);
2500 extern int ext4_group_extend(struct super_block *sb,
2501 				struct ext4_super_block *es,
2502 				ext4_fsblk_t n_blocks_count);
2503 extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count);
2504 
2505 /* super.c */
2506 extern int ext4_seq_options_show(struct seq_file *seq, void *offset);
2507 extern int ext4_calculate_overhead(struct super_block *sb);
2508 extern void ext4_superblock_csum_set(struct super_block *sb);
2509 extern void *ext4_kvmalloc(size_t size, gfp_t flags);
2510 extern void *ext4_kvzalloc(size_t size, gfp_t flags);
2511 extern int ext4_alloc_flex_bg_array(struct super_block *sb,
2512 				    ext4_group_t ngroup);
2513 extern const char *ext4_decode_error(struct super_block *sb, int errno,
2514 				     char nbuf[16]);
2515 
2516 extern __printf(4, 5)
2517 void __ext4_error(struct super_block *, const char *, unsigned int,
2518 		  const char *, ...);
2519 extern __printf(5, 6)
2520 void __ext4_error_inode(struct inode *, const char *, unsigned int, ext4_fsblk_t,
2521 		      const char *, ...);
2522 extern __printf(5, 6)
2523 void __ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t,
2524 		     const char *, ...);
2525 extern void __ext4_std_error(struct super_block *, const char *,
2526 			     unsigned int, int);
2527 extern __printf(4, 5)
2528 void __ext4_abort(struct super_block *, const char *, unsigned int,
2529 		  const char *, ...);
2530 extern __printf(4, 5)
2531 void __ext4_warning(struct super_block *, const char *, unsigned int,
2532 		    const char *, ...);
2533 extern __printf(4, 5)
2534 void __ext4_warning_inode(const struct inode *inode, const char *function,
2535 			  unsigned int line, const char *fmt, ...);
2536 extern __printf(3, 4)
2537 void __ext4_msg(struct super_block *, const char *, const char *, ...);
2538 extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp,
2539 			   const char *, unsigned int, const char *);
2540 extern __printf(7, 8)
2541 void __ext4_grp_locked_error(const char *, unsigned int,
2542 			     struct super_block *, ext4_group_t,
2543 			     unsigned long, ext4_fsblk_t,
2544 			     const char *, ...);
2545 
2546 #define EXT4_ERROR_INODE(inode, fmt, a...) \
2547 	ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a)
2548 
2549 #define EXT4_ERROR_INODE_BLOCK(inode, block, fmt, a...)			\
2550 	ext4_error_inode((inode), __func__, __LINE__, (block), (fmt), ## a)
2551 
2552 #define EXT4_ERROR_FILE(file, block, fmt, a...)				\
2553 	ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a)
2554 
2555 #ifdef CONFIG_PRINTK
2556 
2557 #define ext4_error_inode(inode, func, line, block, fmt, ...)		\
2558 	__ext4_error_inode(inode, func, line, block, fmt, ##__VA_ARGS__)
2559 #define ext4_error_file(file, func, line, block, fmt, ...)		\
2560 	__ext4_error_file(file, func, line, block, fmt, ##__VA_ARGS__)
2561 #define ext4_error(sb, fmt, ...)					\
2562 	__ext4_error(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
2563 #define ext4_abort(sb, fmt, ...)					\
2564 	__ext4_abort(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
2565 #define ext4_warning(sb, fmt, ...)					\
2566 	__ext4_warning(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
2567 #define ext4_warning_inode(inode, fmt, ...)				\
2568 	__ext4_warning_inode(inode, __func__, __LINE__, fmt, ##__VA_ARGS__)
2569 #define ext4_msg(sb, level, fmt, ...)				\
2570 	__ext4_msg(sb, level, fmt, ##__VA_ARGS__)
2571 #define dump_mmp_msg(sb, mmp, msg)					\
2572 	__dump_mmp_msg(sb, mmp, __func__, __LINE__, msg)
2573 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...)		\
2574 	__ext4_grp_locked_error(__func__, __LINE__, sb, grp, ino, block, \
2575 				fmt, ##__VA_ARGS__)
2576 
2577 #else
2578 
2579 #define ext4_error_inode(inode, func, line, block, fmt, ...)		\
2580 do {									\
2581 	no_printk(fmt, ##__VA_ARGS__);					\
2582 	__ext4_error_inode(inode, "", 0, block, " ");			\
2583 } while (0)
2584 #define ext4_error_file(file, func, line, block, fmt, ...)		\
2585 do {									\
2586 	no_printk(fmt, ##__VA_ARGS__);					\
2587 	__ext4_error_file(file, "", 0, block, " ");			\
2588 } while (0)
2589 #define ext4_error(sb, fmt, ...)					\
2590 do {									\
2591 	no_printk(fmt, ##__VA_ARGS__);					\
2592 	__ext4_error(sb, "", 0, " ");					\
2593 } while (0)
2594 #define ext4_abort(sb, fmt, ...)					\
2595 do {									\
2596 	no_printk(fmt, ##__VA_ARGS__);					\
2597 	__ext4_abort(sb, "", 0, " ");					\
2598 } while (0)
2599 #define ext4_warning(sb, fmt, ...)					\
2600 do {									\
2601 	no_printk(fmt, ##__VA_ARGS__);					\
2602 	__ext4_warning(sb, "", 0, " ");					\
2603 } while (0)
2604 #define ext4_warning_inode(inode, fmt, ...)				\
2605 do {									\
2606 	no_printk(fmt, ##__VA_ARGS__);					\
2607 	__ext4_warning_inode(inode, "", 0, " ");			\
2608 } while (0)
2609 #define ext4_msg(sb, level, fmt, ...)					\
2610 do {									\
2611 	no_printk(fmt, ##__VA_ARGS__);					\
2612 	__ext4_msg(sb, "", " ");					\
2613 } while (0)
2614 #define dump_mmp_msg(sb, mmp, msg)					\
2615 	__dump_mmp_msg(sb, mmp, "", 0, "")
2616 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...)		\
2617 do {									\
2618 	no_printk(fmt, ##__VA_ARGS__);				\
2619 	__ext4_grp_locked_error("", 0, sb, grp, ino, block, " ");	\
2620 } while (0)
2621 
2622 #endif
2623 
2624 extern void ext4_update_dynamic_rev(struct super_block *sb);
2625 extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb,
2626 					__u32 compat);
2627 extern int ext4_update_rocompat_feature(handle_t *handle,
2628 					struct super_block *sb,	__u32 rocompat);
2629 extern int ext4_update_incompat_feature(handle_t *handle,
2630 					struct super_block *sb,	__u32 incompat);
2631 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
2632 				      struct ext4_group_desc *bg);
2633 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
2634 				      struct ext4_group_desc *bg);
2635 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
2636 				     struct ext4_group_desc *bg);
2637 extern __u32 ext4_free_group_clusters(struct super_block *sb,
2638 				      struct ext4_group_desc *bg);
2639 extern __u32 ext4_free_inodes_count(struct super_block *sb,
2640 				 struct ext4_group_desc *bg);
2641 extern __u32 ext4_used_dirs_count(struct super_block *sb,
2642 				struct ext4_group_desc *bg);
2643 extern __u32 ext4_itable_unused_count(struct super_block *sb,
2644 				   struct ext4_group_desc *bg);
2645 extern void ext4_block_bitmap_set(struct super_block *sb,
2646 				  struct ext4_group_desc *bg, ext4_fsblk_t blk);
2647 extern void ext4_inode_bitmap_set(struct super_block *sb,
2648 				  struct ext4_group_desc *bg, ext4_fsblk_t blk);
2649 extern void ext4_inode_table_set(struct super_block *sb,
2650 				 struct ext4_group_desc *bg, ext4_fsblk_t blk);
2651 extern void ext4_free_group_clusters_set(struct super_block *sb,
2652 					 struct ext4_group_desc *bg,
2653 					 __u32 count);
2654 extern void ext4_free_inodes_set(struct super_block *sb,
2655 				struct ext4_group_desc *bg, __u32 count);
2656 extern void ext4_used_dirs_set(struct super_block *sb,
2657 				struct ext4_group_desc *bg, __u32 count);
2658 extern void ext4_itable_unused_set(struct super_block *sb,
2659 				   struct ext4_group_desc *bg, __u32 count);
2660 extern int ext4_group_desc_csum_verify(struct super_block *sb, __u32 group,
2661 				       struct ext4_group_desc *gdp);
2662 extern void ext4_group_desc_csum_set(struct super_block *sb, __u32 group,
2663 				     struct ext4_group_desc *gdp);
2664 extern int ext4_register_li_request(struct super_block *sb,
2665 				    ext4_group_t first_not_zeroed);
2666 
2667 static inline int ext4_has_group_desc_csum(struct super_block *sb)
2668 {
2669 	return ext4_has_feature_gdt_csum(sb) ||
2670 	       EXT4_SB(sb)->s_chksum_driver != NULL;
2671 }
2672 
2673 static inline int ext4_has_metadata_csum(struct super_block *sb)
2674 {
2675 	WARN_ON_ONCE(ext4_has_feature_metadata_csum(sb) &&
2676 		     !EXT4_SB(sb)->s_chksum_driver);
2677 
2678 	return (EXT4_SB(sb)->s_chksum_driver != NULL);
2679 }
2680 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
2681 {
2682 	return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) |
2683 		le32_to_cpu(es->s_blocks_count_lo);
2684 }
2685 
2686 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
2687 {
2688 	return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) |
2689 		le32_to_cpu(es->s_r_blocks_count_lo);
2690 }
2691 
2692 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
2693 {
2694 	return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) |
2695 		le32_to_cpu(es->s_free_blocks_count_lo);
2696 }
2697 
2698 static inline void ext4_blocks_count_set(struct ext4_super_block *es,
2699 					 ext4_fsblk_t blk)
2700 {
2701 	es->s_blocks_count_lo = cpu_to_le32((u32)blk);
2702 	es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
2703 }
2704 
2705 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
2706 					      ext4_fsblk_t blk)
2707 {
2708 	es->s_free_blocks_count_lo = cpu_to_le32((u32)blk);
2709 	es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
2710 }
2711 
2712 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
2713 					   ext4_fsblk_t blk)
2714 {
2715 	es->s_r_blocks_count_lo = cpu_to_le32((u32)blk);
2716 	es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
2717 }
2718 
2719 static inline loff_t ext4_isize(struct ext4_inode *raw_inode)
2720 {
2721 	if (S_ISREG(le16_to_cpu(raw_inode->i_mode)))
2722 		return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) |
2723 			le32_to_cpu(raw_inode->i_size_lo);
2724 	else
2725 		return (loff_t) le32_to_cpu(raw_inode->i_size_lo);
2726 }
2727 
2728 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size)
2729 {
2730 	raw_inode->i_size_lo = cpu_to_le32(i_size);
2731 	raw_inode->i_size_high = cpu_to_le32(i_size >> 32);
2732 }
2733 
2734 static inline
2735 struct ext4_group_info *ext4_get_group_info(struct super_block *sb,
2736 					    ext4_group_t group)
2737 {
2738 	 struct ext4_group_info ***grp_info;
2739 	 long indexv, indexh;
2740 	 BUG_ON(group >= EXT4_SB(sb)->s_groups_count);
2741 	 grp_info = EXT4_SB(sb)->s_group_info;
2742 	 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb));
2743 	 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1);
2744 	 return grp_info[indexv][indexh];
2745 }
2746 
2747 /*
2748  * Reading s_groups_count requires using smp_rmb() afterwards.  See
2749  * the locking protocol documented in the comments of ext4_group_add()
2750  * in resize.c
2751  */
2752 static inline ext4_group_t ext4_get_groups_count(struct super_block *sb)
2753 {
2754 	ext4_group_t	ngroups = EXT4_SB(sb)->s_groups_count;
2755 
2756 	smp_rmb();
2757 	return ngroups;
2758 }
2759 
2760 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi,
2761 					     ext4_group_t block_group)
2762 {
2763 	return block_group >> sbi->s_log_groups_per_flex;
2764 }
2765 
2766 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi)
2767 {
2768 	return 1 << sbi->s_log_groups_per_flex;
2769 }
2770 
2771 #define ext4_std_error(sb, errno)				\
2772 do {								\
2773 	if ((errno))						\
2774 		__ext4_std_error((sb), __func__, __LINE__, (errno));	\
2775 } while (0)
2776 
2777 #ifdef CONFIG_SMP
2778 /* Each CPU can accumulate percpu_counter_batch clusters in their local
2779  * counters. So we need to make sure we have free clusters more
2780  * than percpu_counter_batch  * nr_cpu_ids. Also add a window of 4 times.
2781  */
2782 #define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids))
2783 #else
2784 #define EXT4_FREECLUSTERS_WATERMARK 0
2785 #endif
2786 
2787 /* Update i_disksize. Requires i_mutex to avoid races with truncate */
2788 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize)
2789 {
2790 	WARN_ON_ONCE(S_ISREG(inode->i_mode) &&
2791 		     !mutex_is_locked(&inode->i_mutex));
2792 	down_write(&EXT4_I(inode)->i_data_sem);
2793 	if (newsize > EXT4_I(inode)->i_disksize)
2794 		EXT4_I(inode)->i_disksize = newsize;
2795 	up_write(&EXT4_I(inode)->i_data_sem);
2796 }
2797 
2798 /* Update i_size, i_disksize. Requires i_mutex to avoid races with truncate */
2799 static inline int ext4_update_inode_size(struct inode *inode, loff_t newsize)
2800 {
2801 	int changed = 0;
2802 
2803 	if (newsize > inode->i_size) {
2804 		i_size_write(inode, newsize);
2805 		changed = 1;
2806 	}
2807 	if (newsize > EXT4_I(inode)->i_disksize) {
2808 		ext4_update_i_disksize(inode, newsize);
2809 		changed |= 2;
2810 	}
2811 	return changed;
2812 }
2813 
2814 struct ext4_group_info {
2815 	unsigned long   bb_state;
2816 	struct rb_root  bb_free_root;
2817 	ext4_grpblk_t	bb_first_free;	/* first free block */
2818 	ext4_grpblk_t	bb_free;	/* total free blocks */
2819 	ext4_grpblk_t	bb_fragments;	/* nr of freespace fragments */
2820 	ext4_grpblk_t	bb_largest_free_order;/* order of largest frag in BG */
2821 	struct          list_head bb_prealloc_list;
2822 #ifdef DOUBLE_CHECK
2823 	void            *bb_bitmap;
2824 #endif
2825 	struct rw_semaphore alloc_sem;
2826 	ext4_grpblk_t	bb_counters[];	/* Nr of free power-of-two-block
2827 					 * regions, index is order.
2828 					 * bb_counters[3] = 5 means
2829 					 * 5 free 8-block regions. */
2830 };
2831 
2832 #define EXT4_GROUP_INFO_NEED_INIT_BIT		0
2833 #define EXT4_GROUP_INFO_WAS_TRIMMED_BIT		1
2834 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT	2
2835 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT	3
2836 
2837 #define EXT4_MB_GRP_NEED_INIT(grp)	\
2838 	(test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state)))
2839 #define EXT4_MB_GRP_BBITMAP_CORRUPT(grp)	\
2840 	(test_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &((grp)->bb_state)))
2841 #define EXT4_MB_GRP_IBITMAP_CORRUPT(grp)	\
2842 	(test_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &((grp)->bb_state)))
2843 
2844 #define EXT4_MB_GRP_WAS_TRIMMED(grp)	\
2845 	(test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2846 #define EXT4_MB_GRP_SET_TRIMMED(grp)	\
2847 	(set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2848 #define EXT4_MB_GRP_CLEAR_TRIMMED(grp)	\
2849 	(clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2850 
2851 #define EXT4_MAX_CONTENTION		8
2852 #define EXT4_CONTENTION_THRESHOLD	2
2853 
2854 static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb,
2855 					      ext4_group_t group)
2856 {
2857 	return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group);
2858 }
2859 
2860 /*
2861  * Returns true if the filesystem is busy enough that attempts to
2862  * access the block group locks has run into contention.
2863  */
2864 static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi)
2865 {
2866 	return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD);
2867 }
2868 
2869 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group)
2870 {
2871 	spinlock_t *lock = ext4_group_lock_ptr(sb, group);
2872 	if (spin_trylock(lock))
2873 		/*
2874 		 * We're able to grab the lock right away, so drop the
2875 		 * lock contention counter.
2876 		 */
2877 		atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0);
2878 	else {
2879 		/*
2880 		 * The lock is busy, so bump the contention counter,
2881 		 * and then wait on the spin lock.
2882 		 */
2883 		atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1,
2884 				  EXT4_MAX_CONTENTION);
2885 		spin_lock(lock);
2886 	}
2887 }
2888 
2889 static inline void ext4_unlock_group(struct super_block *sb,
2890 					ext4_group_t group)
2891 {
2892 	spin_unlock(ext4_group_lock_ptr(sb, group));
2893 }
2894 
2895 /*
2896  * Block validity checking
2897  */
2898 #define ext4_check_indirect_blockref(inode, bh)				\
2899 	ext4_check_blockref(__func__, __LINE__, inode,			\
2900 			    (__le32 *)(bh)->b_data,			\
2901 			    EXT4_ADDR_PER_BLOCK((inode)->i_sb))
2902 
2903 #define ext4_ind_check_inode(inode)					\
2904 	ext4_check_blockref(__func__, __LINE__, inode,			\
2905 			    EXT4_I(inode)->i_data,			\
2906 			    EXT4_NDIR_BLOCKS)
2907 
2908 /*
2909  * Inodes and files operations
2910  */
2911 
2912 /* dir.c */
2913 extern const struct file_operations ext4_dir_operations;
2914 
2915 /* file.c */
2916 extern const struct inode_operations ext4_file_inode_operations;
2917 extern const struct file_operations ext4_file_operations;
2918 extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin);
2919 
2920 /* inline.c */
2921 extern int ext4_get_max_inline_size(struct inode *inode);
2922 extern int ext4_find_inline_data_nolock(struct inode *inode);
2923 extern int ext4_init_inline_data(handle_t *handle, struct inode *inode,
2924 				 unsigned int len);
2925 extern int ext4_destroy_inline_data(handle_t *handle, struct inode *inode);
2926 
2927 extern int ext4_readpage_inline(struct inode *inode, struct page *page);
2928 extern int ext4_try_to_write_inline_data(struct address_space *mapping,
2929 					 struct inode *inode,
2930 					 loff_t pos, unsigned len,
2931 					 unsigned flags,
2932 					 struct page **pagep);
2933 extern int ext4_write_inline_data_end(struct inode *inode,
2934 				      loff_t pos, unsigned len,
2935 				      unsigned copied,
2936 				      struct page *page);
2937 extern struct buffer_head *
2938 ext4_journalled_write_inline_data(struct inode *inode,
2939 				  unsigned len,
2940 				  struct page *page);
2941 extern int ext4_da_write_inline_data_begin(struct address_space *mapping,
2942 					   struct inode *inode,
2943 					   loff_t pos, unsigned len,
2944 					   unsigned flags,
2945 					   struct page **pagep,
2946 					   void **fsdata);
2947 extern int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos,
2948 					 unsigned len, unsigned copied,
2949 					 struct page *page);
2950 extern int ext4_try_add_inline_entry(handle_t *handle,
2951 				     struct ext4_filename *fname,
2952 				     struct dentry *dentry,
2953 				     struct inode *inode);
2954 extern int ext4_try_create_inline_dir(handle_t *handle,
2955 				      struct inode *parent,
2956 				      struct inode *inode);
2957 extern int ext4_read_inline_dir(struct file *filp,
2958 				struct dir_context *ctx,
2959 				int *has_inline_data);
2960 extern int htree_inlinedir_to_tree(struct file *dir_file,
2961 				   struct inode *dir, ext4_lblk_t block,
2962 				   struct dx_hash_info *hinfo,
2963 				   __u32 start_hash, __u32 start_minor_hash,
2964 				   int *has_inline_data);
2965 extern struct buffer_head *ext4_find_inline_entry(struct inode *dir,
2966 					struct ext4_filename *fname,
2967 					const struct qstr *d_name,
2968 					struct ext4_dir_entry_2 **res_dir,
2969 					int *has_inline_data);
2970 extern int ext4_delete_inline_entry(handle_t *handle,
2971 				    struct inode *dir,
2972 				    struct ext4_dir_entry_2 *de_del,
2973 				    struct buffer_head *bh,
2974 				    int *has_inline_data);
2975 extern int empty_inline_dir(struct inode *dir, int *has_inline_data);
2976 extern struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
2977 					struct ext4_dir_entry_2 **parent_de,
2978 					int *retval);
2979 extern int ext4_inline_data_fiemap(struct inode *inode,
2980 				   struct fiemap_extent_info *fieinfo,
2981 				   int *has_inline, __u64 start, __u64 len);
2982 extern int ext4_try_to_evict_inline_data(handle_t *handle,
2983 					 struct inode *inode,
2984 					 int needed);
2985 extern void ext4_inline_data_truncate(struct inode *inode, int *has_inline);
2986 
2987 extern int ext4_convert_inline_data(struct inode *inode);
2988 
2989 static inline int ext4_has_inline_data(struct inode *inode)
2990 {
2991 	return ext4_test_inode_flag(inode, EXT4_INODE_INLINE_DATA) &&
2992 	       EXT4_I(inode)->i_inline_off;
2993 }
2994 
2995 /* namei.c */
2996 extern const struct inode_operations ext4_dir_inode_operations;
2997 extern const struct inode_operations ext4_special_inode_operations;
2998 extern struct dentry *ext4_get_parent(struct dentry *child);
2999 extern struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode,
3000 				 struct ext4_dir_entry_2 *de,
3001 				 int blocksize, int csum_size,
3002 				 unsigned int parent_ino, int dotdot_real_len);
3003 extern void initialize_dirent_tail(struct ext4_dir_entry_tail *t,
3004 				   unsigned int blocksize);
3005 extern int ext4_handle_dirty_dirent_node(handle_t *handle,
3006 					 struct inode *inode,
3007 					 struct buffer_head *bh);
3008 #define S_SHIFT 12
3009 static unsigned char ext4_type_by_mode[S_IFMT >> S_SHIFT] = {
3010 	[S_IFREG >> S_SHIFT]	= EXT4_FT_REG_FILE,
3011 	[S_IFDIR >> S_SHIFT]	= EXT4_FT_DIR,
3012 	[S_IFCHR >> S_SHIFT]	= EXT4_FT_CHRDEV,
3013 	[S_IFBLK >> S_SHIFT]	= EXT4_FT_BLKDEV,
3014 	[S_IFIFO >> S_SHIFT]	= EXT4_FT_FIFO,
3015 	[S_IFSOCK >> S_SHIFT]	= EXT4_FT_SOCK,
3016 	[S_IFLNK >> S_SHIFT]	= EXT4_FT_SYMLINK,
3017 };
3018 
3019 static inline void ext4_set_de_type(struct super_block *sb,
3020 				struct ext4_dir_entry_2 *de,
3021 				umode_t mode) {
3022 	if (ext4_has_feature_filetype(sb))
3023 		de->file_type = ext4_type_by_mode[(mode & S_IFMT)>>S_SHIFT];
3024 }
3025 
3026 /* readpages.c */
3027 extern int ext4_mpage_readpages(struct address_space *mapping,
3028 				struct list_head *pages, struct page *page,
3029 				unsigned nr_pages);
3030 
3031 /* symlink.c */
3032 extern const struct inode_operations ext4_encrypted_symlink_inode_operations;
3033 extern const struct inode_operations ext4_symlink_inode_operations;
3034 extern const struct inode_operations ext4_fast_symlink_inode_operations;
3035 
3036 /* sysfs.c */
3037 extern int ext4_register_sysfs(struct super_block *sb);
3038 extern void ext4_unregister_sysfs(struct super_block *sb);
3039 extern int __init ext4_init_sysfs(void);
3040 extern void ext4_exit_sysfs(void);
3041 
3042 /* block_validity */
3043 extern void ext4_release_system_zone(struct super_block *sb);
3044 extern int ext4_setup_system_zone(struct super_block *sb);
3045 extern int __init ext4_init_system_zone(void);
3046 extern void ext4_exit_system_zone(void);
3047 extern int ext4_data_block_valid(struct ext4_sb_info *sbi,
3048 				 ext4_fsblk_t start_blk,
3049 				 unsigned int count);
3050 extern int ext4_check_blockref(const char *, unsigned int,
3051 			       struct inode *, __le32 *, unsigned int);
3052 
3053 /* extents.c */
3054 struct ext4_ext_path;
3055 struct ext4_extent;
3056 
3057 /*
3058  * Maximum number of logical blocks in a file; ext4_extent's ee_block is
3059  * __le32.
3060  */
3061 #define EXT_MAX_BLOCKS	0xffffffff
3062 
3063 extern int ext4_ext_tree_init(handle_t *handle, struct inode *);
3064 extern int ext4_ext_writepage_trans_blocks(struct inode *, int);
3065 extern int ext4_ext_index_trans_blocks(struct inode *inode, int extents);
3066 extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
3067 			       struct ext4_map_blocks *map, int flags);
3068 extern void ext4_ext_truncate(handle_t *, struct inode *);
3069 extern int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start,
3070 				 ext4_lblk_t end);
3071 extern void ext4_ext_init(struct super_block *);
3072 extern void ext4_ext_release(struct super_block *);
3073 extern long ext4_fallocate(struct file *file, int mode, loff_t offset,
3074 			  loff_t len);
3075 extern int ext4_convert_unwritten_extents(handle_t *handle, struct inode *inode,
3076 					  loff_t offset, ssize_t len);
3077 extern int ext4_map_blocks(handle_t *handle, struct inode *inode,
3078 			   struct ext4_map_blocks *map, int flags);
3079 extern int ext4_ext_calc_metadata_amount(struct inode *inode,
3080 					 ext4_lblk_t lblocks);
3081 extern int ext4_ext_calc_credits_for_single_extent(struct inode *inode,
3082 						   int num,
3083 						   struct ext4_ext_path *path);
3084 extern int ext4_can_extents_be_merged(struct inode *inode,
3085 				      struct ext4_extent *ex1,
3086 				      struct ext4_extent *ex2);
3087 extern int ext4_ext_insert_extent(handle_t *, struct inode *,
3088 				  struct ext4_ext_path **,
3089 				  struct ext4_extent *, int);
3090 extern struct ext4_ext_path *ext4_find_extent(struct inode *, ext4_lblk_t,
3091 					      struct ext4_ext_path **,
3092 					      int flags);
3093 extern void ext4_ext_drop_refs(struct ext4_ext_path *);
3094 extern int ext4_ext_check_inode(struct inode *inode);
3095 extern int ext4_find_delalloc_range(struct inode *inode,
3096 				    ext4_lblk_t lblk_start,
3097 				    ext4_lblk_t lblk_end);
3098 extern int ext4_find_delalloc_cluster(struct inode *inode, ext4_lblk_t lblk);
3099 extern ext4_lblk_t ext4_ext_next_allocated_block(struct ext4_ext_path *path);
3100 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
3101 			__u64 start, __u64 len);
3102 extern int ext4_ext_precache(struct inode *inode);
3103 extern int ext4_collapse_range(struct inode *inode, loff_t offset, loff_t len);
3104 extern int ext4_insert_range(struct inode *inode, loff_t offset, loff_t len);
3105 extern int ext4_swap_extents(handle_t *handle, struct inode *inode1,
3106 				struct inode *inode2, ext4_lblk_t lblk1,
3107 			     ext4_lblk_t lblk2,  ext4_lblk_t count,
3108 			     int mark_unwritten,int *err);
3109 
3110 /* move_extent.c */
3111 extern void ext4_double_down_write_data_sem(struct inode *first,
3112 					    struct inode *second);
3113 extern void ext4_double_up_write_data_sem(struct inode *orig_inode,
3114 					  struct inode *donor_inode);
3115 extern int ext4_move_extents(struct file *o_filp, struct file *d_filp,
3116 			     __u64 start_orig, __u64 start_donor,
3117 			     __u64 len, __u64 *moved_len);
3118 
3119 /* page-io.c */
3120 extern int __init ext4_init_pageio(void);
3121 extern void ext4_exit_pageio(void);
3122 extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags);
3123 extern ext4_io_end_t *ext4_get_io_end(ext4_io_end_t *io_end);
3124 extern int ext4_put_io_end(ext4_io_end_t *io_end);
3125 extern void ext4_put_io_end_defer(ext4_io_end_t *io_end);
3126 extern void ext4_io_submit_init(struct ext4_io_submit *io,
3127 				struct writeback_control *wbc);
3128 extern void ext4_end_io_rsv_work(struct work_struct *work);
3129 extern void ext4_io_submit(struct ext4_io_submit *io);
3130 extern int ext4_bio_write_page(struct ext4_io_submit *io,
3131 			       struct page *page,
3132 			       int len,
3133 			       struct writeback_control *wbc,
3134 			       bool keep_towrite);
3135 
3136 /* mmp.c */
3137 extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t);
3138 
3139 /*
3140  * Add new method to test whether block and inode bitmaps are properly
3141  * initialized. With uninit_bg reading the block from disk is not enough
3142  * to mark the bitmap uptodate. We need to also zero-out the bitmap
3143  */
3144 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart
3145 
3146 static inline int bitmap_uptodate(struct buffer_head *bh)
3147 {
3148 	return (buffer_uptodate(bh) &&
3149 			test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state));
3150 }
3151 static inline void set_bitmap_uptodate(struct buffer_head *bh)
3152 {
3153 	set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state);
3154 }
3155 
3156 /*
3157  * Disable DIO read nolock optimization, so new dioreaders will be forced
3158  * to grab i_mutex
3159  */
3160 static inline void ext4_inode_block_unlocked_dio(struct inode *inode)
3161 {
3162 	ext4_set_inode_state(inode, EXT4_STATE_DIOREAD_LOCK);
3163 	smp_mb();
3164 }
3165 static inline void ext4_inode_resume_unlocked_dio(struct inode *inode)
3166 {
3167 	smp_mb();
3168 	ext4_clear_inode_state(inode, EXT4_STATE_DIOREAD_LOCK);
3169 }
3170 
3171 #define in_range(b, first, len)	((b) >= (first) && (b) <= (first) + (len) - 1)
3172 
3173 /* For ioend & aio unwritten conversion wait queues */
3174 #define EXT4_WQ_HASH_SZ		37
3175 #define ext4_ioend_wq(v)   (&ext4__ioend_wq[((unsigned long)(v)) %\
3176 					    EXT4_WQ_HASH_SZ])
3177 #define ext4_aio_mutex(v)  (&ext4__aio_mutex[((unsigned long)(v)) %\
3178 					     EXT4_WQ_HASH_SZ])
3179 extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
3180 extern struct mutex ext4__aio_mutex[EXT4_WQ_HASH_SZ];
3181 
3182 #define EXT4_RESIZING	0
3183 extern int ext4_resize_begin(struct super_block *sb);
3184 extern void ext4_resize_end(struct super_block *sb);
3185 
3186 #endif	/* __KERNEL__ */
3187 
3188 #define EFSBADCRC	EBADMSG		/* Bad CRC detected */
3189 #define EFSCORRUPTED	EUCLEAN		/* Filesystem is corrupted */
3190 
3191 #endif	/* _EXT4_H */
3192