xref: /openbmc/linux/fs/ext4/ext4.h (revision 56d06fa2)
1 /*
2  *  ext4.h
3  *
4  * Copyright (C) 1992, 1993, 1994, 1995
5  * Remy Card (card@masi.ibp.fr)
6  * Laboratoire MASI - Institut Blaise Pascal
7  * Universite Pierre et Marie Curie (Paris VI)
8  *
9  *  from
10  *
11  *  linux/include/linux/minix_fs.h
12  *
13  *  Copyright (C) 1991, 1992  Linus Torvalds
14  */
15 
16 #ifndef _EXT4_H
17 #define _EXT4_H
18 
19 #include <linux/types.h>
20 #include <linux/blkdev.h>
21 #include <linux/magic.h>
22 #include <linux/jbd2.h>
23 #include <linux/quota.h>
24 #include <linux/rwsem.h>
25 #include <linux/rbtree.h>
26 #include <linux/seqlock.h>
27 #include <linux/mutex.h>
28 #include <linux/timer.h>
29 #include <linux/version.h>
30 #include <linux/wait.h>
31 #include <linux/blockgroup_lock.h>
32 #include <linux/percpu_counter.h>
33 #include <linux/ratelimit.h>
34 #include <crypto/hash.h>
35 #include <linux/falloc.h>
36 #ifdef __KERNEL__
37 #include <linux/compat.h>
38 #endif
39 
40 /*
41  * The fourth extended filesystem constants/structures
42  */
43 
44 /*
45  * with AGGRESSIVE_CHECK allocator runs consistency checks over
46  * structures. these checks slow things down a lot
47  */
48 #define AGGRESSIVE_CHECK__
49 
50 /*
51  * with DOUBLE_CHECK defined mballoc creates persistent in-core
52  * bitmaps, maintains and uses them to check for double allocations
53  */
54 #define DOUBLE_CHECK__
55 
56 /*
57  * Define EXT4FS_DEBUG to produce debug messages
58  */
59 #undef EXT4FS_DEBUG
60 
61 /*
62  * Debug code
63  */
64 #ifdef EXT4FS_DEBUG
65 #define ext4_debug(f, a...)						\
66 	do {								\
67 		printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:",	\
68 			__FILE__, __LINE__, __func__);			\
69 		printk(KERN_DEBUG f, ## a);				\
70 	} while (0)
71 #else
72 #define ext4_debug(fmt, ...)	no_printk(fmt, ##__VA_ARGS__)
73 #endif
74 
75 /*
76  * Turn on EXT_DEBUG to get lots of info about extents operations.
77  */
78 #define EXT_DEBUG__
79 #ifdef EXT_DEBUG
80 #define ext_debug(fmt, ...)	printk(fmt, ##__VA_ARGS__)
81 #else
82 #define ext_debug(fmt, ...)	no_printk(fmt, ##__VA_ARGS__)
83 #endif
84 
85 /* data type for block offset of block group */
86 typedef int ext4_grpblk_t;
87 
88 /* data type for filesystem-wide blocks number */
89 typedef unsigned long long ext4_fsblk_t;
90 
91 /* data type for file logical block number */
92 typedef __u32 ext4_lblk_t;
93 
94 /* data type for block group number */
95 typedef unsigned int ext4_group_t;
96 
97 enum SHIFT_DIRECTION {
98 	SHIFT_LEFT = 0,
99 	SHIFT_RIGHT,
100 };
101 
102 /*
103  * Flags used in mballoc's allocation_context flags field.
104  *
105  * Also used to show what's going on for debugging purposes when the
106  * flag field is exported via the traceport interface
107  */
108 
109 /* prefer goal again. length */
110 #define EXT4_MB_HINT_MERGE		0x0001
111 /* blocks already reserved */
112 #define EXT4_MB_HINT_RESERVED		0x0002
113 /* metadata is being allocated */
114 #define EXT4_MB_HINT_METADATA		0x0004
115 /* first blocks in the file */
116 #define EXT4_MB_HINT_FIRST		0x0008
117 /* search for the best chunk */
118 #define EXT4_MB_HINT_BEST		0x0010
119 /* data is being allocated */
120 #define EXT4_MB_HINT_DATA		0x0020
121 /* don't preallocate (for tails) */
122 #define EXT4_MB_HINT_NOPREALLOC		0x0040
123 /* allocate for locality group */
124 #define EXT4_MB_HINT_GROUP_ALLOC	0x0080
125 /* allocate goal blocks or none */
126 #define EXT4_MB_HINT_GOAL_ONLY		0x0100
127 /* goal is meaningful */
128 #define EXT4_MB_HINT_TRY_GOAL		0x0200
129 /* blocks already pre-reserved by delayed allocation */
130 #define EXT4_MB_DELALLOC_RESERVED	0x0400
131 /* We are doing stream allocation */
132 #define EXT4_MB_STREAM_ALLOC		0x0800
133 /* Use reserved root blocks if needed */
134 #define EXT4_MB_USE_ROOT_BLOCKS		0x1000
135 /* Use blocks from reserved pool */
136 #define EXT4_MB_USE_RESERVED		0x2000
137 
138 struct ext4_allocation_request {
139 	/* target inode for block we're allocating */
140 	struct inode *inode;
141 	/* how many blocks we want to allocate */
142 	unsigned int len;
143 	/* logical block in target inode */
144 	ext4_lblk_t logical;
145 	/* the closest logical allocated block to the left */
146 	ext4_lblk_t lleft;
147 	/* the closest logical allocated block to the right */
148 	ext4_lblk_t lright;
149 	/* phys. target (a hint) */
150 	ext4_fsblk_t goal;
151 	/* phys. block for the closest logical allocated block to the left */
152 	ext4_fsblk_t pleft;
153 	/* phys. block for the closest logical allocated block to the right */
154 	ext4_fsblk_t pright;
155 	/* flags. see above EXT4_MB_HINT_* */
156 	unsigned int flags;
157 };
158 
159 /*
160  * Logical to physical block mapping, used by ext4_map_blocks()
161  *
162  * This structure is used to pass requests into ext4_map_blocks() as
163  * well as to store the information returned by ext4_map_blocks().  It
164  * takes less room on the stack than a struct buffer_head.
165  */
166 #define EXT4_MAP_NEW		(1 << BH_New)
167 #define EXT4_MAP_MAPPED		(1 << BH_Mapped)
168 #define EXT4_MAP_UNWRITTEN	(1 << BH_Unwritten)
169 #define EXT4_MAP_BOUNDARY	(1 << BH_Boundary)
170 #define EXT4_MAP_FLAGS		(EXT4_MAP_NEW | EXT4_MAP_MAPPED |\
171 				 EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY)
172 
173 struct ext4_map_blocks {
174 	ext4_fsblk_t m_pblk;
175 	ext4_lblk_t m_lblk;
176 	unsigned int m_len;
177 	unsigned int m_flags;
178 };
179 
180 /*
181  * Flags for ext4_io_end->flags
182  */
183 #define	EXT4_IO_END_UNWRITTEN	0x0001
184 
185 /*
186  * For converting unwritten extents on a work queue. 'handle' is used for
187  * buffered writeback.
188  */
189 typedef struct ext4_io_end {
190 	struct list_head	list;		/* per-file finished IO list */
191 	handle_t		*handle;	/* handle reserved for extent
192 						 * conversion */
193 	struct inode		*inode;		/* file being written to */
194 	struct bio		*bio;		/* Linked list of completed
195 						 * bios covering the extent */
196 	unsigned int		flag;		/* unwritten or not */
197 	atomic_t		count;		/* reference counter */
198 	loff_t			offset;		/* offset in the file */
199 	ssize_t			size;		/* size of the extent */
200 } ext4_io_end_t;
201 
202 struct ext4_io_submit {
203 	struct writeback_control *io_wbc;
204 	struct bio		*io_bio;
205 	ext4_io_end_t		*io_end;
206 	sector_t		io_next_block;
207 };
208 
209 /*
210  * Special inodes numbers
211  */
212 #define	EXT4_BAD_INO		 1	/* Bad blocks inode */
213 #define EXT4_ROOT_INO		 2	/* Root inode */
214 #define EXT4_USR_QUOTA_INO	 3	/* User quota inode */
215 #define EXT4_GRP_QUOTA_INO	 4	/* Group quota inode */
216 #define EXT4_BOOT_LOADER_INO	 5	/* Boot loader inode */
217 #define EXT4_UNDEL_DIR_INO	 6	/* Undelete directory inode */
218 #define EXT4_RESIZE_INO		 7	/* Reserved group descriptors inode */
219 #define EXT4_JOURNAL_INO	 8	/* Journal inode */
220 
221 /* First non-reserved inode for old ext4 filesystems */
222 #define EXT4_GOOD_OLD_FIRST_INO	11
223 
224 /*
225  * Maximal count of links to a file
226  */
227 #define EXT4_LINK_MAX		65000
228 
229 /*
230  * Macro-instructions used to manage several block sizes
231  */
232 #define EXT4_MIN_BLOCK_SIZE		1024
233 #define	EXT4_MAX_BLOCK_SIZE		65536
234 #define EXT4_MIN_BLOCK_LOG_SIZE		10
235 #define EXT4_MAX_BLOCK_LOG_SIZE		16
236 #ifdef __KERNEL__
237 # define EXT4_BLOCK_SIZE(s)		((s)->s_blocksize)
238 #else
239 # define EXT4_BLOCK_SIZE(s)		(EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
240 #endif
241 #define	EXT4_ADDR_PER_BLOCK(s)		(EXT4_BLOCK_SIZE(s) / sizeof(__u32))
242 #define EXT4_CLUSTER_SIZE(s)		(EXT4_BLOCK_SIZE(s) << \
243 					 EXT4_SB(s)->s_cluster_bits)
244 #ifdef __KERNEL__
245 # define EXT4_BLOCK_SIZE_BITS(s)	((s)->s_blocksize_bits)
246 # define EXT4_CLUSTER_BITS(s)		(EXT4_SB(s)->s_cluster_bits)
247 #else
248 # define EXT4_BLOCK_SIZE_BITS(s)	((s)->s_log_block_size + 10)
249 #endif
250 #ifdef __KERNEL__
251 #define	EXT4_ADDR_PER_BLOCK_BITS(s)	(EXT4_SB(s)->s_addr_per_block_bits)
252 #define EXT4_INODE_SIZE(s)		(EXT4_SB(s)->s_inode_size)
253 #define EXT4_FIRST_INO(s)		(EXT4_SB(s)->s_first_ino)
254 #else
255 #define EXT4_INODE_SIZE(s)	(((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
256 				 EXT4_GOOD_OLD_INODE_SIZE : \
257 				 (s)->s_inode_size)
258 #define EXT4_FIRST_INO(s)	(((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
259 				 EXT4_GOOD_OLD_FIRST_INO : \
260 				 (s)->s_first_ino)
261 #endif
262 #define EXT4_BLOCK_ALIGN(size, blkbits)		ALIGN((size), (1 << (blkbits)))
263 
264 /* Translate a block number to a cluster number */
265 #define EXT4_B2C(sbi, blk)	((blk) >> (sbi)->s_cluster_bits)
266 /* Translate a cluster number to a block number */
267 #define EXT4_C2B(sbi, cluster)	((cluster) << (sbi)->s_cluster_bits)
268 /* Translate # of blks to # of clusters */
269 #define EXT4_NUM_B2C(sbi, blks)	(((blks) + (sbi)->s_cluster_ratio - 1) >> \
270 				 (sbi)->s_cluster_bits)
271 /* Mask out the low bits to get the starting block of the cluster */
272 #define EXT4_PBLK_CMASK(s, pblk) ((pblk) &				\
273 				  ~((ext4_fsblk_t) (s)->s_cluster_ratio - 1))
274 #define EXT4_LBLK_CMASK(s, lblk) ((lblk) &				\
275 				  ~((ext4_lblk_t) (s)->s_cluster_ratio - 1))
276 /* Get the cluster offset */
277 #define EXT4_PBLK_COFF(s, pblk) ((pblk) &				\
278 				 ((ext4_fsblk_t) (s)->s_cluster_ratio - 1))
279 #define EXT4_LBLK_COFF(s, lblk) ((lblk) &				\
280 				 ((ext4_lblk_t) (s)->s_cluster_ratio - 1))
281 
282 /*
283  * Structure of a blocks group descriptor
284  */
285 struct ext4_group_desc
286 {
287 	__le32	bg_block_bitmap_lo;	/* Blocks bitmap block */
288 	__le32	bg_inode_bitmap_lo;	/* Inodes bitmap block */
289 	__le32	bg_inode_table_lo;	/* Inodes table block */
290 	__le16	bg_free_blocks_count_lo;/* Free blocks count */
291 	__le16	bg_free_inodes_count_lo;/* Free inodes count */
292 	__le16	bg_used_dirs_count_lo;	/* Directories count */
293 	__le16	bg_flags;		/* EXT4_BG_flags (INODE_UNINIT, etc) */
294 	__le32  bg_exclude_bitmap_lo;   /* Exclude bitmap for snapshots */
295 	__le16  bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bbitmap) LE */
296 	__le16  bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+ibitmap) LE */
297 	__le16  bg_itable_unused_lo;	/* Unused inodes count */
298 	__le16  bg_checksum;		/* crc16(sb_uuid+group+desc) */
299 	__le32	bg_block_bitmap_hi;	/* Blocks bitmap block MSB */
300 	__le32	bg_inode_bitmap_hi;	/* Inodes bitmap block MSB */
301 	__le32	bg_inode_table_hi;	/* Inodes table block MSB */
302 	__le16	bg_free_blocks_count_hi;/* Free blocks count MSB */
303 	__le16	bg_free_inodes_count_hi;/* Free inodes count MSB */
304 	__le16	bg_used_dirs_count_hi;	/* Directories count MSB */
305 	__le16  bg_itable_unused_hi;    /* Unused inodes count MSB */
306 	__le32  bg_exclude_bitmap_hi;   /* Exclude bitmap block MSB */
307 	__le16  bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bbitmap) BE */
308 	__le16  bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+ibitmap) BE */
309 	__u32   bg_reserved;
310 };
311 
312 #define EXT4_BG_INODE_BITMAP_CSUM_HI_END	\
313 	(offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \
314 	 sizeof(__le16))
315 #define EXT4_BG_BLOCK_BITMAP_CSUM_HI_END	\
316 	(offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \
317 	 sizeof(__le16))
318 
319 /*
320  * Structure of a flex block group info
321  */
322 
323 struct flex_groups {
324 	atomic64_t	free_clusters;
325 	atomic_t	free_inodes;
326 	atomic_t	used_dirs;
327 };
328 
329 #define EXT4_BG_INODE_UNINIT	0x0001 /* Inode table/bitmap not in use */
330 #define EXT4_BG_BLOCK_UNINIT	0x0002 /* Block bitmap not in use */
331 #define EXT4_BG_INODE_ZEROED	0x0004 /* On-disk itable initialized to zero */
332 
333 /*
334  * Macro-instructions used to manage group descriptors
335  */
336 #define EXT4_MIN_DESC_SIZE		32
337 #define EXT4_MIN_DESC_SIZE_64BIT	64
338 #define	EXT4_MAX_DESC_SIZE		EXT4_MIN_BLOCK_SIZE
339 #define EXT4_DESC_SIZE(s)		(EXT4_SB(s)->s_desc_size)
340 #ifdef __KERNEL__
341 # define EXT4_BLOCKS_PER_GROUP(s)	(EXT4_SB(s)->s_blocks_per_group)
342 # define EXT4_CLUSTERS_PER_GROUP(s)	(EXT4_SB(s)->s_clusters_per_group)
343 # define EXT4_DESC_PER_BLOCK(s)		(EXT4_SB(s)->s_desc_per_block)
344 # define EXT4_INODES_PER_GROUP(s)	(EXT4_SB(s)->s_inodes_per_group)
345 # define EXT4_DESC_PER_BLOCK_BITS(s)	(EXT4_SB(s)->s_desc_per_block_bits)
346 #else
347 # define EXT4_BLOCKS_PER_GROUP(s)	((s)->s_blocks_per_group)
348 # define EXT4_DESC_PER_BLOCK(s)		(EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
349 # define EXT4_INODES_PER_GROUP(s)	((s)->s_inodes_per_group)
350 #endif
351 
352 /*
353  * Constants relative to the data blocks
354  */
355 #define	EXT4_NDIR_BLOCKS		12
356 #define	EXT4_IND_BLOCK			EXT4_NDIR_BLOCKS
357 #define	EXT4_DIND_BLOCK			(EXT4_IND_BLOCK + 1)
358 #define	EXT4_TIND_BLOCK			(EXT4_DIND_BLOCK + 1)
359 #define	EXT4_N_BLOCKS			(EXT4_TIND_BLOCK + 1)
360 
361 /*
362  * Inode flags
363  */
364 #define	EXT4_SECRM_FL			0x00000001 /* Secure deletion */
365 #define	EXT4_UNRM_FL			0x00000002 /* Undelete */
366 #define	EXT4_COMPR_FL			0x00000004 /* Compress file */
367 #define EXT4_SYNC_FL			0x00000008 /* Synchronous updates */
368 #define EXT4_IMMUTABLE_FL		0x00000010 /* Immutable file */
369 #define EXT4_APPEND_FL			0x00000020 /* writes to file may only append */
370 #define EXT4_NODUMP_FL			0x00000040 /* do not dump file */
371 #define EXT4_NOATIME_FL			0x00000080 /* do not update atime */
372 /* Reserved for compression usage... */
373 #define EXT4_DIRTY_FL			0x00000100
374 #define EXT4_COMPRBLK_FL		0x00000200 /* One or more compressed clusters */
375 #define EXT4_NOCOMPR_FL			0x00000400 /* Don't compress */
376 	/* nb: was previously EXT2_ECOMPR_FL */
377 #define EXT4_ENCRYPT_FL			0x00000800 /* encrypted file */
378 /* End compression flags --- maybe not all used */
379 #define EXT4_INDEX_FL			0x00001000 /* hash-indexed directory */
380 #define EXT4_IMAGIC_FL			0x00002000 /* AFS directory */
381 #define EXT4_JOURNAL_DATA_FL		0x00004000 /* file data should be journaled */
382 #define EXT4_NOTAIL_FL			0x00008000 /* file tail should not be merged */
383 #define EXT4_DIRSYNC_FL			0x00010000 /* dirsync behaviour (directories only) */
384 #define EXT4_TOPDIR_FL			0x00020000 /* Top of directory hierarchies*/
385 #define EXT4_HUGE_FILE_FL               0x00040000 /* Set to each huge file */
386 #define EXT4_EXTENTS_FL			0x00080000 /* Inode uses extents */
387 #define EXT4_EA_INODE_FL	        0x00200000 /* Inode used for large EA */
388 #define EXT4_EOFBLOCKS_FL		0x00400000 /* Blocks allocated beyond EOF */
389 #define EXT4_INLINE_DATA_FL		0x10000000 /* Inode has inline data. */
390 #define EXT4_PROJINHERIT_FL		0x20000000 /* Create with parents projid */
391 #define EXT4_RESERVED_FL		0x80000000 /* reserved for ext4 lib */
392 
393 #define EXT4_FL_USER_VISIBLE		0x304BDFFF /* User visible flags */
394 #define EXT4_FL_USER_MODIFIABLE		0x204380FF /* User modifiable flags */
395 
396 #define EXT4_FL_XFLAG_VISIBLE		(EXT4_SYNC_FL | \
397 					 EXT4_IMMUTABLE_FL | \
398 					 EXT4_APPEND_FL | \
399 					 EXT4_NODUMP_FL | \
400 					 EXT4_NOATIME_FL | \
401 					 EXT4_PROJINHERIT_FL)
402 
403 /* Flags that should be inherited by new inodes from their parent. */
404 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\
405 			   EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\
406 			   EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\
407 			   EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL |\
408 			   EXT4_PROJINHERIT_FL)
409 
410 /* Flags that are appropriate for regular files (all but dir-specific ones). */
411 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL))
412 
413 /* Flags that are appropriate for non-directories/regular files. */
414 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL)
415 
416 /* Mask out flags that are inappropriate for the given type of inode. */
417 static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags)
418 {
419 	if (S_ISDIR(mode))
420 		return flags;
421 	else if (S_ISREG(mode))
422 		return flags & EXT4_REG_FLMASK;
423 	else
424 		return flags & EXT4_OTHER_FLMASK;
425 }
426 
427 /*
428  * Inode flags used for atomic set/get
429  */
430 enum {
431 	EXT4_INODE_SECRM	= 0,	/* Secure deletion */
432 	EXT4_INODE_UNRM		= 1,	/* Undelete */
433 	EXT4_INODE_COMPR	= 2,	/* Compress file */
434 	EXT4_INODE_SYNC		= 3,	/* Synchronous updates */
435 	EXT4_INODE_IMMUTABLE	= 4,	/* Immutable file */
436 	EXT4_INODE_APPEND	= 5,	/* writes to file may only append */
437 	EXT4_INODE_NODUMP	= 6,	/* do not dump file */
438 	EXT4_INODE_NOATIME	= 7,	/* do not update atime */
439 /* Reserved for compression usage... */
440 	EXT4_INODE_DIRTY	= 8,
441 	EXT4_INODE_COMPRBLK	= 9,	/* One or more compressed clusters */
442 	EXT4_INODE_NOCOMPR	= 10,	/* Don't compress */
443 	EXT4_INODE_ENCRYPT	= 11,	/* Encrypted file */
444 /* End compression flags --- maybe not all used */
445 	EXT4_INODE_INDEX	= 12,	/* hash-indexed directory */
446 	EXT4_INODE_IMAGIC	= 13,	/* AFS directory */
447 	EXT4_INODE_JOURNAL_DATA	= 14,	/* file data should be journaled */
448 	EXT4_INODE_NOTAIL	= 15,	/* file tail should not be merged */
449 	EXT4_INODE_DIRSYNC	= 16,	/* dirsync behaviour (directories only) */
450 	EXT4_INODE_TOPDIR	= 17,	/* Top of directory hierarchies*/
451 	EXT4_INODE_HUGE_FILE	= 18,	/* Set to each huge file */
452 	EXT4_INODE_EXTENTS	= 19,	/* Inode uses extents */
453 	EXT4_INODE_EA_INODE	= 21,	/* Inode used for large EA */
454 	EXT4_INODE_EOFBLOCKS	= 22,	/* Blocks allocated beyond EOF */
455 	EXT4_INODE_INLINE_DATA	= 28,	/* Data in inode. */
456 	EXT4_INODE_PROJINHERIT	= 29,	/* Create with parents projid */
457 	EXT4_INODE_RESERVED	= 31,	/* reserved for ext4 lib */
458 };
459 
460 /*
461  * Since it's pretty easy to mix up bit numbers and hex values, we use a
462  * build-time check to make sure that EXT4_XXX_FL is consistent with respect to
463  * EXT4_INODE_XXX. If all is well, the macros will be dropped, so, it won't cost
464  * any extra space in the compiled kernel image, otherwise, the build will fail.
465  * It's important that these values are the same, since we are using
466  * EXT4_INODE_XXX to test for flag values, but EXT4_XXX_FL must be consistent
467  * with the values of FS_XXX_FL defined in include/linux/fs.h and the on-disk
468  * values found in ext2, ext3 and ext4 filesystems, and of course the values
469  * defined in e2fsprogs.
470  *
471  * It's not paranoia if the Murphy's Law really *is* out to get you.  :-)
472  */
473 #define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG))
474 #define CHECK_FLAG_VALUE(FLAG) BUILD_BUG_ON(!TEST_FLAG_VALUE(FLAG))
475 
476 static inline void ext4_check_flag_values(void)
477 {
478 	CHECK_FLAG_VALUE(SECRM);
479 	CHECK_FLAG_VALUE(UNRM);
480 	CHECK_FLAG_VALUE(COMPR);
481 	CHECK_FLAG_VALUE(SYNC);
482 	CHECK_FLAG_VALUE(IMMUTABLE);
483 	CHECK_FLAG_VALUE(APPEND);
484 	CHECK_FLAG_VALUE(NODUMP);
485 	CHECK_FLAG_VALUE(NOATIME);
486 	CHECK_FLAG_VALUE(DIRTY);
487 	CHECK_FLAG_VALUE(COMPRBLK);
488 	CHECK_FLAG_VALUE(NOCOMPR);
489 	CHECK_FLAG_VALUE(ENCRYPT);
490 	CHECK_FLAG_VALUE(INDEX);
491 	CHECK_FLAG_VALUE(IMAGIC);
492 	CHECK_FLAG_VALUE(JOURNAL_DATA);
493 	CHECK_FLAG_VALUE(NOTAIL);
494 	CHECK_FLAG_VALUE(DIRSYNC);
495 	CHECK_FLAG_VALUE(TOPDIR);
496 	CHECK_FLAG_VALUE(HUGE_FILE);
497 	CHECK_FLAG_VALUE(EXTENTS);
498 	CHECK_FLAG_VALUE(EA_INODE);
499 	CHECK_FLAG_VALUE(EOFBLOCKS);
500 	CHECK_FLAG_VALUE(INLINE_DATA);
501 	CHECK_FLAG_VALUE(PROJINHERIT);
502 	CHECK_FLAG_VALUE(RESERVED);
503 }
504 
505 /* Used to pass group descriptor data when online resize is done */
506 struct ext4_new_group_input {
507 	__u32 group;		/* Group number for this data */
508 	__u64 block_bitmap;	/* Absolute block number of block bitmap */
509 	__u64 inode_bitmap;	/* Absolute block number of inode bitmap */
510 	__u64 inode_table;	/* Absolute block number of inode table start */
511 	__u32 blocks_count;	/* Total number of blocks in this group */
512 	__u16 reserved_blocks;	/* Number of reserved blocks in this group */
513 	__u16 unused;
514 };
515 
516 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
517 struct compat_ext4_new_group_input {
518 	u32 group;
519 	compat_u64 block_bitmap;
520 	compat_u64 inode_bitmap;
521 	compat_u64 inode_table;
522 	u32 blocks_count;
523 	u16 reserved_blocks;
524 	u16 unused;
525 };
526 #endif
527 
528 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */
529 struct ext4_new_group_data {
530 	__u32 group;
531 	__u64 block_bitmap;
532 	__u64 inode_bitmap;
533 	__u64 inode_table;
534 	__u32 blocks_count;
535 	__u16 reserved_blocks;
536 	__u16 unused;
537 	__u32 free_blocks_count;
538 };
539 
540 /* Indexes used to index group tables in ext4_new_group_data */
541 enum {
542 	BLOCK_BITMAP = 0,	/* block bitmap */
543 	INODE_BITMAP,		/* inode bitmap */
544 	INODE_TABLE,		/* inode tables */
545 	GROUP_TABLE_COUNT,
546 };
547 
548 /*
549  * Flags used by ext4_map_blocks()
550  */
551 	/* Allocate any needed blocks and/or convert an unwritten
552 	   extent to be an initialized ext4 */
553 #define EXT4_GET_BLOCKS_CREATE			0x0001
554 	/* Request the creation of an unwritten extent */
555 #define EXT4_GET_BLOCKS_UNWRIT_EXT		0x0002
556 #define EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT	(EXT4_GET_BLOCKS_UNWRIT_EXT|\
557 						 EXT4_GET_BLOCKS_CREATE)
558 	/* Caller is from the delayed allocation writeout path
559 	 * finally doing the actual allocation of delayed blocks */
560 #define EXT4_GET_BLOCKS_DELALLOC_RESERVE	0x0004
561 	/* caller is from the direct IO path, request to creation of an
562 	unwritten extents if not allocated, split the unwritten
563 	extent if blocks has been preallocated already*/
564 #define EXT4_GET_BLOCKS_PRE_IO			0x0008
565 #define EXT4_GET_BLOCKS_CONVERT			0x0010
566 #define EXT4_GET_BLOCKS_IO_CREATE_EXT		(EXT4_GET_BLOCKS_PRE_IO|\
567 					 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT)
568 	/* Convert extent to initialized after IO complete */
569 #define EXT4_GET_BLOCKS_IO_CONVERT_EXT		(EXT4_GET_BLOCKS_CONVERT|\
570 					 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT)
571 	/* Eventual metadata allocation (due to growing extent tree)
572 	 * should not fail, so try to use reserved blocks for that.*/
573 #define EXT4_GET_BLOCKS_METADATA_NOFAIL		0x0020
574 	/* Don't normalize allocation size (used for fallocate) */
575 #define EXT4_GET_BLOCKS_NO_NORMALIZE		0x0040
576 	/* Request will not result in inode size update (user for fallocate) */
577 #define EXT4_GET_BLOCKS_KEEP_SIZE		0x0080
578 	/* Convert written extents to unwritten */
579 #define EXT4_GET_BLOCKS_CONVERT_UNWRITTEN	0x0100
580 	/* Write zeros to newly created written extents */
581 #define EXT4_GET_BLOCKS_ZERO			0x0200
582 #define EXT4_GET_BLOCKS_CREATE_ZERO		(EXT4_GET_BLOCKS_CREATE |\
583 					EXT4_GET_BLOCKS_ZERO)
584 
585 /*
586  * The bit position of these flags must not overlap with any of the
587  * EXT4_GET_BLOCKS_*.  They are used by ext4_find_extent(),
588  * read_extent_tree_block(), ext4_split_extent_at(),
589  * ext4_ext_insert_extent(), and ext4_ext_create_new_leaf().
590  * EXT4_EX_NOCACHE is used to indicate that the we shouldn't be
591  * caching the extents when reading from the extent tree while a
592  * truncate or punch hole operation is in progress.
593  */
594 #define EXT4_EX_NOCACHE				0x40000000
595 #define EXT4_EX_FORCE_CACHE			0x20000000
596 
597 /*
598  * Flags used by ext4_free_blocks
599  */
600 #define EXT4_FREE_BLOCKS_METADATA	0x0001
601 #define EXT4_FREE_BLOCKS_FORGET		0x0002
602 #define EXT4_FREE_BLOCKS_VALIDATED	0x0004
603 #define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE	0x0008
604 #define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER	0x0010
605 #define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER	0x0020
606 
607 /* Encryption algorithms */
608 #define EXT4_ENCRYPTION_MODE_INVALID		0
609 #define EXT4_ENCRYPTION_MODE_AES_256_XTS	1
610 #define EXT4_ENCRYPTION_MODE_AES_256_GCM	2
611 #define EXT4_ENCRYPTION_MODE_AES_256_CBC	3
612 #define EXT4_ENCRYPTION_MODE_AES_256_CTS	4
613 
614 #include "ext4_crypto.h"
615 
616 /*
617  * ioctl commands
618  */
619 #define	EXT4_IOC_GETFLAGS		FS_IOC_GETFLAGS
620 #define	EXT4_IOC_SETFLAGS		FS_IOC_SETFLAGS
621 #define	EXT4_IOC_GETVERSION		_IOR('f', 3, long)
622 #define	EXT4_IOC_SETVERSION		_IOW('f', 4, long)
623 #define	EXT4_IOC_GETVERSION_OLD		FS_IOC_GETVERSION
624 #define	EXT4_IOC_SETVERSION_OLD		FS_IOC_SETVERSION
625 #define EXT4_IOC_GETRSVSZ		_IOR('f', 5, long)
626 #define EXT4_IOC_SETRSVSZ		_IOW('f', 6, long)
627 #define EXT4_IOC_GROUP_EXTEND		_IOW('f', 7, unsigned long)
628 #define EXT4_IOC_GROUP_ADD		_IOW('f', 8, struct ext4_new_group_input)
629 #define EXT4_IOC_MIGRATE		_IO('f', 9)
630  /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */
631  /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */
632 #define EXT4_IOC_ALLOC_DA_BLKS		_IO('f', 12)
633 #define EXT4_IOC_MOVE_EXT		_IOWR('f', 15, struct move_extent)
634 #define EXT4_IOC_RESIZE_FS		_IOW('f', 16, __u64)
635 #define EXT4_IOC_SWAP_BOOT		_IO('f', 17)
636 #define EXT4_IOC_PRECACHE_EXTENTS	_IO('f', 18)
637 #define EXT4_IOC_SET_ENCRYPTION_POLICY	_IOR('f', 19, struct ext4_encryption_policy)
638 #define EXT4_IOC_GET_ENCRYPTION_PWSALT	_IOW('f', 20, __u8[16])
639 #define EXT4_IOC_GET_ENCRYPTION_POLICY	_IOW('f', 21, struct ext4_encryption_policy)
640 
641 #ifndef FS_IOC_FSGETXATTR
642 /* Until the uapi changes get merged for project quota... */
643 
644 #define FS_IOC_FSGETXATTR		_IOR('X', 31, struct fsxattr)
645 #define FS_IOC_FSSETXATTR		_IOW('X', 32, struct fsxattr)
646 
647 /*
648  * Structure for FS_IOC_FSGETXATTR and FS_IOC_FSSETXATTR.
649  */
650 struct fsxattr {
651 	__u32		fsx_xflags;	/* xflags field value (get/set) */
652 	__u32		fsx_extsize;	/* extsize field value (get/set)*/
653 	__u32		fsx_nextents;	/* nextents field value (get)	*/
654 	__u32		fsx_projid;	/* project identifier (get/set) */
655 	unsigned char	fsx_pad[12];
656 };
657 
658 /*
659  * Flags for the fsx_xflags field
660  */
661 #define FS_XFLAG_REALTIME	0x00000001	/* data in realtime volume */
662 #define FS_XFLAG_PREALLOC	0x00000002	/* preallocated file extents */
663 #define FS_XFLAG_IMMUTABLE	0x00000008	/* file cannot be modified */
664 #define FS_XFLAG_APPEND		0x00000010	/* all writes append */
665 #define FS_XFLAG_SYNC		0x00000020	/* all writes synchronous */
666 #define FS_XFLAG_NOATIME	0x00000040	/* do not update access time */
667 #define FS_XFLAG_NODUMP		0x00000080	/* do not include in backups */
668 #define FS_XFLAG_RTINHERIT	0x00000100	/* create with rt bit set */
669 #define FS_XFLAG_PROJINHERIT	0x00000200	/* create with parents projid */
670 #define FS_XFLAG_NOSYMLINKS	0x00000400	/* disallow symlink creation */
671 #define FS_XFLAG_EXTSIZE	0x00000800	/* extent size allocator hint */
672 #define FS_XFLAG_EXTSZINHERIT	0x00001000	/* inherit inode extent size */
673 #define FS_XFLAG_NODEFRAG	0x00002000  	/* do not defragment */
674 #define FS_XFLAG_FILESTREAM	0x00004000	/* use filestream allocator */
675 #define FS_XFLAG_HASATTR	0x80000000	/* no DIFLAG for this */
676 #endif /* !defined(FS_IOC_FSGETXATTR) */
677 
678 #define EXT4_IOC_FSGETXATTR		FS_IOC_FSGETXATTR
679 #define EXT4_IOC_FSSETXATTR		FS_IOC_FSSETXATTR
680 
681 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
682 /*
683  * ioctl commands in 32 bit emulation
684  */
685 #define EXT4_IOC32_GETFLAGS		FS_IOC32_GETFLAGS
686 #define EXT4_IOC32_SETFLAGS		FS_IOC32_SETFLAGS
687 #define EXT4_IOC32_GETVERSION		_IOR('f', 3, int)
688 #define EXT4_IOC32_SETVERSION		_IOW('f', 4, int)
689 #define EXT4_IOC32_GETRSVSZ		_IOR('f', 5, int)
690 #define EXT4_IOC32_SETRSVSZ		_IOW('f', 6, int)
691 #define EXT4_IOC32_GROUP_EXTEND		_IOW('f', 7, unsigned int)
692 #define EXT4_IOC32_GROUP_ADD		_IOW('f', 8, struct compat_ext4_new_group_input)
693 #define EXT4_IOC32_GETVERSION_OLD	FS_IOC32_GETVERSION
694 #define EXT4_IOC32_SETVERSION_OLD	FS_IOC32_SETVERSION
695 #endif
696 
697 /* Max physical block we can address w/o extents */
698 #define EXT4_MAX_BLOCK_FILE_PHYS	0xFFFFFFFF
699 
700 /*
701  * Structure of an inode on the disk
702  */
703 struct ext4_inode {
704 	__le16	i_mode;		/* File mode */
705 	__le16	i_uid;		/* Low 16 bits of Owner Uid */
706 	__le32	i_size_lo;	/* Size in bytes */
707 	__le32	i_atime;	/* Access time */
708 	__le32	i_ctime;	/* Inode Change time */
709 	__le32	i_mtime;	/* Modification time */
710 	__le32	i_dtime;	/* Deletion Time */
711 	__le16	i_gid;		/* Low 16 bits of Group Id */
712 	__le16	i_links_count;	/* Links count */
713 	__le32	i_blocks_lo;	/* Blocks count */
714 	__le32	i_flags;	/* File flags */
715 	union {
716 		struct {
717 			__le32  l_i_version;
718 		} linux1;
719 		struct {
720 			__u32  h_i_translator;
721 		} hurd1;
722 		struct {
723 			__u32  m_i_reserved1;
724 		} masix1;
725 	} osd1;				/* OS dependent 1 */
726 	__le32	i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
727 	__le32	i_generation;	/* File version (for NFS) */
728 	__le32	i_file_acl_lo;	/* File ACL */
729 	__le32	i_size_high;
730 	__le32	i_obso_faddr;	/* Obsoleted fragment address */
731 	union {
732 		struct {
733 			__le16	l_i_blocks_high; /* were l_i_reserved1 */
734 			__le16	l_i_file_acl_high;
735 			__le16	l_i_uid_high;	/* these 2 fields */
736 			__le16	l_i_gid_high;	/* were reserved2[0] */
737 			__le16	l_i_checksum_lo;/* crc32c(uuid+inum+inode) LE */
738 			__le16	l_i_reserved;
739 		} linux2;
740 		struct {
741 			__le16	h_i_reserved1;	/* Obsoleted fragment number/size which are removed in ext4 */
742 			__u16	h_i_mode_high;
743 			__u16	h_i_uid_high;
744 			__u16	h_i_gid_high;
745 			__u32	h_i_author;
746 		} hurd2;
747 		struct {
748 			__le16	h_i_reserved1;	/* Obsoleted fragment number/size which are removed in ext4 */
749 			__le16	m_i_file_acl_high;
750 			__u32	m_i_reserved2[2];
751 		} masix2;
752 	} osd2;				/* OS dependent 2 */
753 	__le16	i_extra_isize;
754 	__le16	i_checksum_hi;	/* crc32c(uuid+inum+inode) BE */
755 	__le32  i_ctime_extra;  /* extra Change time      (nsec << 2 | epoch) */
756 	__le32  i_mtime_extra;  /* extra Modification time(nsec << 2 | epoch) */
757 	__le32  i_atime_extra;  /* extra Access time      (nsec << 2 | epoch) */
758 	__le32  i_crtime;       /* File Creation time */
759 	__le32  i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */
760 	__le32  i_version_hi;	/* high 32 bits for 64-bit version */
761 	__le32	i_projid;	/* Project ID */
762 };
763 
764 struct move_extent {
765 	__u32 reserved;		/* should be zero */
766 	__u32 donor_fd;		/* donor file descriptor */
767 	__u64 orig_start;	/* logical start offset in block for orig */
768 	__u64 donor_start;	/* logical start offset in block for donor */
769 	__u64 len;		/* block length to be moved */
770 	__u64 moved_len;	/* moved block length */
771 };
772 
773 #define EXT4_EPOCH_BITS 2
774 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
775 #define EXT4_NSEC_MASK  (~0UL << EXT4_EPOCH_BITS)
776 
777 /*
778  * Extended fields will fit into an inode if the filesystem was formatted
779  * with large inodes (-I 256 or larger) and there are not currently any EAs
780  * consuming all of the available space. For new inodes we always reserve
781  * enough space for the kernel's known extended fields, but for inodes
782  * created with an old kernel this might not have been the case. None of
783  * the extended inode fields is critical for correct filesystem operation.
784  * This macro checks if a certain field fits in the inode. Note that
785  * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
786  */
787 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field)	\
788 	((offsetof(typeof(*ext4_inode), field) +	\
789 	  sizeof((ext4_inode)->field))			\
790 	<= (EXT4_GOOD_OLD_INODE_SIZE +			\
791 	    (einode)->i_extra_isize))			\
792 
793 /*
794  * We use an encoding that preserves the times for extra epoch "00":
795  *
796  * extra  msb of                         adjust for signed
797  * epoch  32-bit                         32-bit tv_sec to
798  * bits   time    decoded 64-bit tv_sec  64-bit tv_sec      valid time range
799  * 0 0    1    -0x80000000..-0x00000001  0x000000000 1901-12-13..1969-12-31
800  * 0 0    0    0x000000000..0x07fffffff  0x000000000 1970-01-01..2038-01-19
801  * 0 1    1    0x080000000..0x0ffffffff  0x100000000 2038-01-19..2106-02-07
802  * 0 1    0    0x100000000..0x17fffffff  0x100000000 2106-02-07..2174-02-25
803  * 1 0    1    0x180000000..0x1ffffffff  0x200000000 2174-02-25..2242-03-16
804  * 1 0    0    0x200000000..0x27fffffff  0x200000000 2242-03-16..2310-04-04
805  * 1 1    1    0x280000000..0x2ffffffff  0x300000000 2310-04-04..2378-04-22
806  * 1 1    0    0x300000000..0x37fffffff  0x300000000 2378-04-22..2446-05-10
807  *
808  * Note that previous versions of the kernel on 64-bit systems would
809  * incorrectly use extra epoch bits 1,1 for dates between 1901 and
810  * 1970.  e2fsck will correct this, assuming that it is run on the
811  * affected filesystem before 2242.
812  */
813 
814 static inline __le32 ext4_encode_extra_time(struct timespec *time)
815 {
816 	u32 extra = sizeof(time->tv_sec) > 4 ?
817 		((time->tv_sec - (s32)time->tv_sec) >> 32) & EXT4_EPOCH_MASK : 0;
818 	return cpu_to_le32(extra | (time->tv_nsec << EXT4_EPOCH_BITS));
819 }
820 
821 static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra)
822 {
823 	if (unlikely(sizeof(time->tv_sec) > 4 &&
824 			(extra & cpu_to_le32(EXT4_EPOCH_MASK)))) {
825 #if LINUX_VERSION_CODE < KERNEL_VERSION(4,20,0)
826 		/* Handle legacy encoding of pre-1970 dates with epoch
827 		 * bits 1,1.  We assume that by kernel version 4.20,
828 		 * everyone will have run fsck over the affected
829 		 * filesystems to correct the problem.  (This
830 		 * backwards compatibility may be removed before this
831 		 * time, at the discretion of the ext4 developers.)
832 		 */
833 		u64 extra_bits = le32_to_cpu(extra) & EXT4_EPOCH_MASK;
834 		if (extra_bits == 3 && ((time->tv_sec) & 0x80000000) != 0)
835 			extra_bits = 0;
836 		time->tv_sec += extra_bits << 32;
837 #else
838 		time->tv_sec += (u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) << 32;
839 #endif
840 	}
841 	time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS;
842 }
843 
844 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode)			       \
845 do {									       \
846 	(raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec);	       \
847 	if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra))     \
848 		(raw_inode)->xtime ## _extra =				       \
849 				ext4_encode_extra_time(&(inode)->xtime);       \
850 } while (0)
851 
852 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode)			       \
853 do {									       \
854 	if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime))		       \
855 		(raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec);      \
856 	if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra))	       \
857 		(raw_inode)->xtime ## _extra =				       \
858 				ext4_encode_extra_time(&(einode)->xtime);      \
859 } while (0)
860 
861 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode)			       \
862 do {									       \
863 	(inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime);       \
864 	if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra))     \
865 		ext4_decode_extra_time(&(inode)->xtime,			       \
866 				       raw_inode->xtime ## _extra);	       \
867 	else								       \
868 		(inode)->xtime.tv_nsec = 0;				       \
869 } while (0)
870 
871 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode)			       \
872 do {									       \
873 	if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime))		       \
874 		(einode)->xtime.tv_sec = 				       \
875 			(signed)le32_to_cpu((raw_inode)->xtime);	       \
876 	else								       \
877 		(einode)->xtime.tv_sec = 0;				       \
878 	if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra))	       \
879 		ext4_decode_extra_time(&(einode)->xtime,		       \
880 				       raw_inode->xtime ## _extra);	       \
881 	else								       \
882 		(einode)->xtime.tv_nsec = 0;				       \
883 } while (0)
884 
885 #define i_disk_version osd1.linux1.l_i_version
886 
887 #if defined(__KERNEL__) || defined(__linux__)
888 #define i_reserved1	osd1.linux1.l_i_reserved1
889 #define i_file_acl_high	osd2.linux2.l_i_file_acl_high
890 #define i_blocks_high	osd2.linux2.l_i_blocks_high
891 #define i_uid_low	i_uid
892 #define i_gid_low	i_gid
893 #define i_uid_high	osd2.linux2.l_i_uid_high
894 #define i_gid_high	osd2.linux2.l_i_gid_high
895 #define i_checksum_lo	osd2.linux2.l_i_checksum_lo
896 
897 #elif defined(__GNU__)
898 
899 #define i_translator	osd1.hurd1.h_i_translator
900 #define i_uid_high	osd2.hurd2.h_i_uid_high
901 #define i_gid_high	osd2.hurd2.h_i_gid_high
902 #define i_author	osd2.hurd2.h_i_author
903 
904 #elif defined(__masix__)
905 
906 #define i_reserved1	osd1.masix1.m_i_reserved1
907 #define i_file_acl_high	osd2.masix2.m_i_file_acl_high
908 #define i_reserved2	osd2.masix2.m_i_reserved2
909 
910 #endif /* defined(__KERNEL__) || defined(__linux__) */
911 
912 #include "extents_status.h"
913 
914 /*
915  * Lock subclasses for i_data_sem in the ext4_inode_info structure.
916  *
917  * These are needed to avoid lockdep false positives when we need to
918  * allocate blocks to the quota inode during ext4_map_blocks(), while
919  * holding i_data_sem for a normal (non-quota) inode.  Since we don't
920  * do quota tracking for the quota inode, this avoids deadlock (as
921  * well as infinite recursion, since it isn't turtles all the way
922  * down...)
923  *
924  *  I_DATA_SEM_NORMAL - Used for most inodes
925  *  I_DATA_SEM_OTHER  - Used by move_inode.c for the second normal inode
926  *			  where the second inode has larger inode number
927  *			  than the first
928  *  I_DATA_SEM_QUOTA  - Used for quota inodes only
929  */
930 enum {
931 	I_DATA_SEM_NORMAL = 0,
932 	I_DATA_SEM_OTHER,
933 	I_DATA_SEM_QUOTA,
934 };
935 
936 
937 /*
938  * fourth extended file system inode data in memory
939  */
940 struct ext4_inode_info {
941 	__le32	i_data[15];	/* unconverted */
942 	__u32	i_dtime;
943 	ext4_fsblk_t	i_file_acl;
944 
945 	/*
946 	 * i_block_group is the number of the block group which contains
947 	 * this file's inode.  Constant across the lifetime of the inode,
948 	 * it is ued for making block allocation decisions - we try to
949 	 * place a file's data blocks near its inode block, and new inodes
950 	 * near to their parent directory's inode.
951 	 */
952 	ext4_group_t	i_block_group;
953 	ext4_lblk_t	i_dir_start_lookup;
954 #if (BITS_PER_LONG < 64)
955 	unsigned long	i_state_flags;		/* Dynamic state flags */
956 #endif
957 	unsigned long	i_flags;
958 
959 	/*
960 	 * Extended attributes can be read independently of the main file
961 	 * data. Taking i_mutex even when reading would cause contention
962 	 * between readers of EAs and writers of regular file data, so
963 	 * instead we synchronize on xattr_sem when reading or changing
964 	 * EAs.
965 	 */
966 	struct rw_semaphore xattr_sem;
967 
968 	struct list_head i_orphan;	/* unlinked but open inodes */
969 
970 	/*
971 	 * i_disksize keeps track of what the inode size is ON DISK, not
972 	 * in memory.  During truncate, i_size is set to the new size by
973 	 * the VFS prior to calling ext4_truncate(), but the filesystem won't
974 	 * set i_disksize to 0 until the truncate is actually under way.
975 	 *
976 	 * The intent is that i_disksize always represents the blocks which
977 	 * are used by this file.  This allows recovery to restart truncate
978 	 * on orphans if we crash during truncate.  We actually write i_disksize
979 	 * into the on-disk inode when writing inodes out, instead of i_size.
980 	 *
981 	 * The only time when i_disksize and i_size may be different is when
982 	 * a truncate is in progress.  The only things which change i_disksize
983 	 * are ext4_get_block (growth) and ext4_truncate (shrinkth).
984 	 */
985 	loff_t	i_disksize;
986 
987 	/*
988 	 * i_data_sem is for serialising ext4_truncate() against
989 	 * ext4_getblock().  In the 2.4 ext2 design, great chunks of inode's
990 	 * data tree are chopped off during truncate. We can't do that in
991 	 * ext4 because whenever we perform intermediate commits during
992 	 * truncate, the inode and all the metadata blocks *must* be in a
993 	 * consistent state which allows truncation of the orphans to restart
994 	 * during recovery.  Hence we must fix the get_block-vs-truncate race
995 	 * by other means, so we have i_data_sem.
996 	 */
997 	struct rw_semaphore i_data_sem;
998 	/*
999 	 * i_mmap_sem is for serializing page faults with truncate / punch hole
1000 	 * operations. We have to make sure that new page cannot be faulted in
1001 	 * a section of the inode that is being punched. We cannot easily use
1002 	 * i_data_sem for this since we need protection for the whole punch
1003 	 * operation and i_data_sem ranks below transaction start so we have
1004 	 * to occasionally drop it.
1005 	 */
1006 	struct rw_semaphore i_mmap_sem;
1007 	struct inode vfs_inode;
1008 	struct jbd2_inode *jinode;
1009 
1010 	spinlock_t i_raw_lock;	/* protects updates to the raw inode */
1011 
1012 	/*
1013 	 * File creation time. Its function is same as that of
1014 	 * struct timespec i_{a,c,m}time in the generic inode.
1015 	 */
1016 	struct timespec i_crtime;
1017 
1018 	/* mballoc */
1019 	struct list_head i_prealloc_list;
1020 	spinlock_t i_prealloc_lock;
1021 
1022 	/* extents status tree */
1023 	struct ext4_es_tree i_es_tree;
1024 	rwlock_t i_es_lock;
1025 	struct list_head i_es_list;
1026 	unsigned int i_es_all_nr;	/* protected by i_es_lock */
1027 	unsigned int i_es_shk_nr;	/* protected by i_es_lock */
1028 	ext4_lblk_t i_es_shrink_lblk;	/* Offset where we start searching for
1029 					   extents to shrink. Protected by
1030 					   i_es_lock  */
1031 
1032 	/* ialloc */
1033 	ext4_group_t	i_last_alloc_group;
1034 
1035 	/* allocation reservation info for delalloc */
1036 	/* In case of bigalloc, these refer to clusters rather than blocks */
1037 	unsigned int i_reserved_data_blocks;
1038 	unsigned int i_reserved_meta_blocks;
1039 	unsigned int i_allocated_meta_blocks;
1040 	ext4_lblk_t i_da_metadata_calc_last_lblock;
1041 	int i_da_metadata_calc_len;
1042 
1043 	/* on-disk additional length */
1044 	__u16 i_extra_isize;
1045 
1046 	/* Indicate the inline data space. */
1047 	u16 i_inline_off;
1048 	u16 i_inline_size;
1049 
1050 #ifdef CONFIG_QUOTA
1051 	/* quota space reservation, managed internally by quota code */
1052 	qsize_t i_reserved_quota;
1053 #endif
1054 
1055 	/* Lock protecting lists below */
1056 	spinlock_t i_completed_io_lock;
1057 	/*
1058 	 * Completed IOs that need unwritten extents handling and have
1059 	 * transaction reserved
1060 	 */
1061 	struct list_head i_rsv_conversion_list;
1062 	struct work_struct i_rsv_conversion_work;
1063 	atomic_t i_unwritten; /* Nr. of inflight conversions pending */
1064 
1065 	spinlock_t i_block_reservation_lock;
1066 
1067 	/*
1068 	 * Transactions that contain inode's metadata needed to complete
1069 	 * fsync and fdatasync, respectively.
1070 	 */
1071 	tid_t i_sync_tid;
1072 	tid_t i_datasync_tid;
1073 
1074 #ifdef CONFIG_QUOTA
1075 	struct dquot *i_dquot[MAXQUOTAS];
1076 #endif
1077 
1078 	/* Precomputed uuid+inum+igen checksum for seeding inode checksums */
1079 	__u32 i_csum_seed;
1080 
1081 #ifdef CONFIG_EXT4_FS_ENCRYPTION
1082 	/* Encryption params */
1083 	struct ext4_crypt_info *i_crypt_info;
1084 #endif
1085 	kprojid_t i_projid;
1086 };
1087 
1088 /*
1089  * File system states
1090  */
1091 #define	EXT4_VALID_FS			0x0001	/* Unmounted cleanly */
1092 #define	EXT4_ERROR_FS			0x0002	/* Errors detected */
1093 #define	EXT4_ORPHAN_FS			0x0004	/* Orphans being recovered */
1094 
1095 /*
1096  * Misc. filesystem flags
1097  */
1098 #define EXT2_FLAGS_SIGNED_HASH		0x0001  /* Signed dirhash in use */
1099 #define EXT2_FLAGS_UNSIGNED_HASH	0x0002  /* Unsigned dirhash in use */
1100 #define EXT2_FLAGS_TEST_FILESYS		0x0004	/* to test development code */
1101 
1102 /*
1103  * Mount flags set via mount options or defaults
1104  */
1105 #define EXT4_MOUNT_GRPID		0x00004	/* Create files with directory's group */
1106 #define EXT4_MOUNT_DEBUG		0x00008	/* Some debugging messages */
1107 #define EXT4_MOUNT_ERRORS_CONT		0x00010	/* Continue on errors */
1108 #define EXT4_MOUNT_ERRORS_RO		0x00020	/* Remount fs ro on errors */
1109 #define EXT4_MOUNT_ERRORS_PANIC		0x00040	/* Panic on errors */
1110 #define EXT4_MOUNT_ERRORS_MASK		0x00070
1111 #define EXT4_MOUNT_MINIX_DF		0x00080	/* Mimics the Minix statfs */
1112 #define EXT4_MOUNT_NOLOAD		0x00100	/* Don't use existing journal*/
1113 #ifdef CONFIG_FS_DAX
1114 #define EXT4_MOUNT_DAX			0x00200	/* Direct Access */
1115 #else
1116 #define EXT4_MOUNT_DAX			0
1117 #endif
1118 #define EXT4_MOUNT_DATA_FLAGS		0x00C00	/* Mode for data writes: */
1119 #define EXT4_MOUNT_JOURNAL_DATA		0x00400	/* Write data to journal */
1120 #define EXT4_MOUNT_ORDERED_DATA		0x00800	/* Flush data before commit */
1121 #define EXT4_MOUNT_WRITEBACK_DATA	0x00C00	/* No data ordering */
1122 #define EXT4_MOUNT_UPDATE_JOURNAL	0x01000	/* Update the journal format */
1123 #define EXT4_MOUNT_NO_UID32		0x02000  /* Disable 32-bit UIDs */
1124 #define EXT4_MOUNT_XATTR_USER		0x04000	/* Extended user attributes */
1125 #define EXT4_MOUNT_POSIX_ACL		0x08000	/* POSIX Access Control Lists */
1126 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC	0x10000	/* No auto delalloc mapping */
1127 #define EXT4_MOUNT_BARRIER		0x20000 /* Use block barriers */
1128 #define EXT4_MOUNT_QUOTA		0x80000 /* Some quota option set */
1129 #define EXT4_MOUNT_USRQUOTA		0x100000 /* "old" user quota */
1130 #define EXT4_MOUNT_GRPQUOTA		0x200000 /* "old" group quota */
1131 #define EXT4_MOUNT_DIOREAD_NOLOCK	0x400000 /* Enable support for dio read nolocking */
1132 #define EXT4_MOUNT_JOURNAL_CHECKSUM	0x800000 /* Journal checksums */
1133 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT	0x1000000 /* Journal Async Commit */
1134 #define EXT4_MOUNT_DELALLOC		0x8000000 /* Delalloc support */
1135 #define EXT4_MOUNT_DATA_ERR_ABORT	0x10000000 /* Abort on file data write */
1136 #define EXT4_MOUNT_BLOCK_VALIDITY	0x20000000 /* Block validity checking */
1137 #define EXT4_MOUNT_DISCARD		0x40000000 /* Issue DISCARD requests */
1138 #define EXT4_MOUNT_INIT_INODE_TABLE	0x80000000 /* Initialize uninitialized itables */
1139 
1140 /*
1141  * Mount flags set either automatically (could not be set by mount option)
1142  * based on per file system feature or property or in special cases such as
1143  * distinguishing between explicit mount option definition and default.
1144  */
1145 #define EXT4_MOUNT2_EXPLICIT_DELALLOC	0x00000001 /* User explicitly
1146 						      specified delalloc */
1147 #define EXT4_MOUNT2_STD_GROUP_SIZE	0x00000002 /* We have standard group
1148 						      size of blocksize * 8
1149 						      blocks */
1150 #define EXT4_MOUNT2_HURD_COMPAT		0x00000004 /* Support HURD-castrated
1151 						      file systems */
1152 
1153 #define EXT4_MOUNT2_EXPLICIT_JOURNAL_CHECKSUM	0x00000008 /* User explicitly
1154 						specified journal checksum */
1155 
1156 #define clear_opt(sb, opt)		EXT4_SB(sb)->s_mount_opt &= \
1157 						~EXT4_MOUNT_##opt
1158 #define set_opt(sb, opt)		EXT4_SB(sb)->s_mount_opt |= \
1159 						EXT4_MOUNT_##opt
1160 #define test_opt(sb, opt)		(EXT4_SB(sb)->s_mount_opt & \
1161 					 EXT4_MOUNT_##opt)
1162 
1163 #define clear_opt2(sb, opt)		EXT4_SB(sb)->s_mount_opt2 &= \
1164 						~EXT4_MOUNT2_##opt
1165 #define set_opt2(sb, opt)		EXT4_SB(sb)->s_mount_opt2 |= \
1166 						EXT4_MOUNT2_##opt
1167 #define test_opt2(sb, opt)		(EXT4_SB(sb)->s_mount_opt2 & \
1168 					 EXT4_MOUNT2_##opt)
1169 
1170 #define ext4_test_and_set_bit		__test_and_set_bit_le
1171 #define ext4_set_bit			__set_bit_le
1172 #define ext4_set_bit_atomic		ext2_set_bit_atomic
1173 #define ext4_test_and_clear_bit		__test_and_clear_bit_le
1174 #define ext4_clear_bit			__clear_bit_le
1175 #define ext4_clear_bit_atomic		ext2_clear_bit_atomic
1176 #define ext4_test_bit			test_bit_le
1177 #define ext4_find_next_zero_bit		find_next_zero_bit_le
1178 #define ext4_find_next_bit		find_next_bit_le
1179 
1180 extern void ext4_set_bits(void *bm, int cur, int len);
1181 
1182 /*
1183  * Maximal mount counts between two filesystem checks
1184  */
1185 #define EXT4_DFL_MAX_MNT_COUNT		20	/* Allow 20 mounts */
1186 #define EXT4_DFL_CHECKINTERVAL		0	/* Don't use interval check */
1187 
1188 /*
1189  * Behaviour when detecting errors
1190  */
1191 #define EXT4_ERRORS_CONTINUE		1	/* Continue execution */
1192 #define EXT4_ERRORS_RO			2	/* Remount fs read-only */
1193 #define EXT4_ERRORS_PANIC		3	/* Panic */
1194 #define EXT4_ERRORS_DEFAULT		EXT4_ERRORS_CONTINUE
1195 
1196 /* Metadata checksum algorithm codes */
1197 #define EXT4_CRC32C_CHKSUM		1
1198 
1199 /*
1200  * Structure of the super block
1201  */
1202 struct ext4_super_block {
1203 /*00*/	__le32	s_inodes_count;		/* Inodes count */
1204 	__le32	s_blocks_count_lo;	/* Blocks count */
1205 	__le32	s_r_blocks_count_lo;	/* Reserved blocks count */
1206 	__le32	s_free_blocks_count_lo;	/* Free blocks count */
1207 /*10*/	__le32	s_free_inodes_count;	/* Free inodes count */
1208 	__le32	s_first_data_block;	/* First Data Block */
1209 	__le32	s_log_block_size;	/* Block size */
1210 	__le32	s_log_cluster_size;	/* Allocation cluster size */
1211 /*20*/	__le32	s_blocks_per_group;	/* # Blocks per group */
1212 	__le32	s_clusters_per_group;	/* # Clusters per group */
1213 	__le32	s_inodes_per_group;	/* # Inodes per group */
1214 	__le32	s_mtime;		/* Mount time */
1215 /*30*/	__le32	s_wtime;		/* Write time */
1216 	__le16	s_mnt_count;		/* Mount count */
1217 	__le16	s_max_mnt_count;	/* Maximal mount count */
1218 	__le16	s_magic;		/* Magic signature */
1219 	__le16	s_state;		/* File system state */
1220 	__le16	s_errors;		/* Behaviour when detecting errors */
1221 	__le16	s_minor_rev_level;	/* minor revision level */
1222 /*40*/	__le32	s_lastcheck;		/* time of last check */
1223 	__le32	s_checkinterval;	/* max. time between checks */
1224 	__le32	s_creator_os;		/* OS */
1225 	__le32	s_rev_level;		/* Revision level */
1226 /*50*/	__le16	s_def_resuid;		/* Default uid for reserved blocks */
1227 	__le16	s_def_resgid;		/* Default gid for reserved blocks */
1228 	/*
1229 	 * These fields are for EXT4_DYNAMIC_REV superblocks only.
1230 	 *
1231 	 * Note: the difference between the compatible feature set and
1232 	 * the incompatible feature set is that if there is a bit set
1233 	 * in the incompatible feature set that the kernel doesn't
1234 	 * know about, it should refuse to mount the filesystem.
1235 	 *
1236 	 * e2fsck's requirements are more strict; if it doesn't know
1237 	 * about a feature in either the compatible or incompatible
1238 	 * feature set, it must abort and not try to meddle with
1239 	 * things it doesn't understand...
1240 	 */
1241 	__le32	s_first_ino;		/* First non-reserved inode */
1242 	__le16  s_inode_size;		/* size of inode structure */
1243 	__le16	s_block_group_nr;	/* block group # of this superblock */
1244 	__le32	s_feature_compat;	/* compatible feature set */
1245 /*60*/	__le32	s_feature_incompat;	/* incompatible feature set */
1246 	__le32	s_feature_ro_compat;	/* readonly-compatible feature set */
1247 /*68*/	__u8	s_uuid[16];		/* 128-bit uuid for volume */
1248 /*78*/	char	s_volume_name[16];	/* volume name */
1249 /*88*/	char	s_last_mounted[64];	/* directory where last mounted */
1250 /*C8*/	__le32	s_algorithm_usage_bitmap; /* For compression */
1251 	/*
1252 	 * Performance hints.  Directory preallocation should only
1253 	 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
1254 	 */
1255 	__u8	s_prealloc_blocks;	/* Nr of blocks to try to preallocate*/
1256 	__u8	s_prealloc_dir_blocks;	/* Nr to preallocate for dirs */
1257 	__le16	s_reserved_gdt_blocks;	/* Per group desc for online growth */
1258 	/*
1259 	 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
1260 	 */
1261 /*D0*/	__u8	s_journal_uuid[16];	/* uuid of journal superblock */
1262 /*E0*/	__le32	s_journal_inum;		/* inode number of journal file */
1263 	__le32	s_journal_dev;		/* device number of journal file */
1264 	__le32	s_last_orphan;		/* start of list of inodes to delete */
1265 	__le32	s_hash_seed[4];		/* HTREE hash seed */
1266 	__u8	s_def_hash_version;	/* Default hash version to use */
1267 	__u8	s_jnl_backup_type;
1268 	__le16  s_desc_size;		/* size of group descriptor */
1269 /*100*/	__le32	s_default_mount_opts;
1270 	__le32	s_first_meta_bg;	/* First metablock block group */
1271 	__le32	s_mkfs_time;		/* When the filesystem was created */
1272 	__le32	s_jnl_blocks[17];	/* Backup of the journal inode */
1273 	/* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
1274 /*150*/	__le32	s_blocks_count_hi;	/* Blocks count */
1275 	__le32	s_r_blocks_count_hi;	/* Reserved blocks count */
1276 	__le32	s_free_blocks_count_hi;	/* Free blocks count */
1277 	__le16	s_min_extra_isize;	/* All inodes have at least # bytes */
1278 	__le16	s_want_extra_isize; 	/* New inodes should reserve # bytes */
1279 	__le32	s_flags;		/* Miscellaneous flags */
1280 	__le16  s_raid_stride;		/* RAID stride */
1281 	__le16  s_mmp_update_interval;  /* # seconds to wait in MMP checking */
1282 	__le64  s_mmp_block;            /* Block for multi-mount protection */
1283 	__le32  s_raid_stripe_width;    /* blocks on all data disks (N*stride)*/
1284 	__u8	s_log_groups_per_flex;  /* FLEX_BG group size */
1285 	__u8	s_checksum_type;	/* metadata checksum algorithm used */
1286 	__u8	s_encryption_level;	/* versioning level for encryption */
1287 	__u8	s_reserved_pad;		/* Padding to next 32bits */
1288 	__le64	s_kbytes_written;	/* nr of lifetime kilobytes written */
1289 	__le32	s_snapshot_inum;	/* Inode number of active snapshot */
1290 	__le32	s_snapshot_id;		/* sequential ID of active snapshot */
1291 	__le64	s_snapshot_r_blocks_count; /* reserved blocks for active
1292 					      snapshot's future use */
1293 	__le32	s_snapshot_list;	/* inode number of the head of the
1294 					   on-disk snapshot list */
1295 #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count)
1296 	__le32	s_error_count;		/* number of fs errors */
1297 	__le32	s_first_error_time;	/* first time an error happened */
1298 	__le32	s_first_error_ino;	/* inode involved in first error */
1299 	__le64	s_first_error_block;	/* block involved of first error */
1300 	__u8	s_first_error_func[32];	/* function where the error happened */
1301 	__le32	s_first_error_line;	/* line number where error happened */
1302 	__le32	s_last_error_time;	/* most recent time of an error */
1303 	__le32	s_last_error_ino;	/* inode involved in last error */
1304 	__le32	s_last_error_line;	/* line number where error happened */
1305 	__le64	s_last_error_block;	/* block involved of last error */
1306 	__u8	s_last_error_func[32];	/* function where the error happened */
1307 #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts)
1308 	__u8	s_mount_opts[64];
1309 	__le32	s_usr_quota_inum;	/* inode for tracking user quota */
1310 	__le32	s_grp_quota_inum;	/* inode for tracking group quota */
1311 	__le32	s_overhead_clusters;	/* overhead blocks/clusters in fs */
1312 	__le32	s_backup_bgs[2];	/* groups with sparse_super2 SBs */
1313 	__u8	s_encrypt_algos[4];	/* Encryption algorithms in use  */
1314 	__u8	s_encrypt_pw_salt[16];	/* Salt used for string2key algorithm */
1315 	__le32	s_lpf_ino;		/* Location of the lost+found inode */
1316 	__le32	s_prj_quota_inum;	/* inode for tracking project quota */
1317 	__le32	s_checksum_seed;	/* crc32c(uuid) if csum_seed set */
1318 	__le32	s_reserved[98];		/* Padding to the end of the block */
1319 	__le32	s_checksum;		/* crc32c(superblock) */
1320 };
1321 
1322 #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START)
1323 
1324 #ifdef __KERNEL__
1325 
1326 /*
1327  * run-time mount flags
1328  */
1329 #define EXT4_MF_MNTDIR_SAMPLED		0x0001
1330 #define EXT4_MF_FS_ABORTED		0x0002	/* Fatal error detected */
1331 #define EXT4_MF_TEST_DUMMY_ENCRYPTION	0x0004
1332 
1333 #ifdef CONFIG_EXT4_FS_ENCRYPTION
1334 #define DUMMY_ENCRYPTION_ENABLED(sbi) (unlikely((sbi)->s_mount_flags & \
1335 						EXT4_MF_TEST_DUMMY_ENCRYPTION))
1336 #else
1337 #define DUMMY_ENCRYPTION_ENABLED(sbi) (0)
1338 #endif
1339 
1340 /* Number of quota types we support */
1341 #define EXT4_MAXQUOTAS 3
1342 
1343 /*
1344  * fourth extended-fs super-block data in memory
1345  */
1346 struct ext4_sb_info {
1347 	unsigned long s_desc_size;	/* Size of a group descriptor in bytes */
1348 	unsigned long s_inodes_per_block;/* Number of inodes per block */
1349 	unsigned long s_blocks_per_group;/* Number of blocks in a group */
1350 	unsigned long s_clusters_per_group; /* Number of clusters in a group */
1351 	unsigned long s_inodes_per_group;/* Number of inodes in a group */
1352 	unsigned long s_itb_per_group;	/* Number of inode table blocks per group */
1353 	unsigned long s_gdb_count;	/* Number of group descriptor blocks */
1354 	unsigned long s_desc_per_block;	/* Number of group descriptors per block */
1355 	ext4_group_t s_groups_count;	/* Number of groups in the fs */
1356 	ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */
1357 	unsigned long s_overhead;  /* # of fs overhead clusters */
1358 	unsigned int s_cluster_ratio;	/* Number of blocks per cluster */
1359 	unsigned int s_cluster_bits;	/* log2 of s_cluster_ratio */
1360 	loff_t s_bitmap_maxbytes;	/* max bytes for bitmap files */
1361 	struct buffer_head * s_sbh;	/* Buffer containing the super block */
1362 	struct ext4_super_block *s_es;	/* Pointer to the super block in the buffer */
1363 	struct buffer_head **s_group_desc;
1364 	unsigned int s_mount_opt;
1365 	unsigned int s_mount_opt2;
1366 	unsigned int s_mount_flags;
1367 	unsigned int s_def_mount_opt;
1368 	ext4_fsblk_t s_sb_block;
1369 	atomic64_t s_resv_clusters;
1370 	kuid_t s_resuid;
1371 	kgid_t s_resgid;
1372 	unsigned short s_mount_state;
1373 	unsigned short s_pad;
1374 	int s_addr_per_block_bits;
1375 	int s_desc_per_block_bits;
1376 	int s_inode_size;
1377 	int s_first_ino;
1378 	unsigned int s_inode_readahead_blks;
1379 	unsigned int s_inode_goal;
1380 	spinlock_t s_next_gen_lock;
1381 	u32 s_next_generation;
1382 	u32 s_hash_seed[4];
1383 	int s_def_hash_version;
1384 	int s_hash_unsigned;	/* 3 if hash should be signed, 0 if not */
1385 	struct percpu_counter s_freeclusters_counter;
1386 	struct percpu_counter s_freeinodes_counter;
1387 	struct percpu_counter s_dirs_counter;
1388 	struct percpu_counter s_dirtyclusters_counter;
1389 	struct blockgroup_lock *s_blockgroup_lock;
1390 	struct proc_dir_entry *s_proc;
1391 	struct kobject s_kobj;
1392 	struct completion s_kobj_unregister;
1393 	struct super_block *s_sb;
1394 
1395 	/* Journaling */
1396 	struct journal_s *s_journal;
1397 	struct list_head s_orphan;
1398 	struct mutex s_orphan_lock;
1399 	unsigned long s_resize_flags;		/* Flags indicating if there
1400 						   is a resizer */
1401 	unsigned long s_commit_interval;
1402 	u32 s_max_batch_time;
1403 	u32 s_min_batch_time;
1404 	struct block_device *journal_bdev;
1405 #ifdef CONFIG_QUOTA
1406 	char *s_qf_names[EXT4_MAXQUOTAS];	/* Names of quota files with journalled quota */
1407 	int s_jquota_fmt;			/* Format of quota to use */
1408 #endif
1409 	unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */
1410 	struct rb_root system_blks;
1411 
1412 #ifdef EXTENTS_STATS
1413 	/* ext4 extents stats */
1414 	unsigned long s_ext_min;
1415 	unsigned long s_ext_max;
1416 	unsigned long s_depth_max;
1417 	spinlock_t s_ext_stats_lock;
1418 	unsigned long s_ext_blocks;
1419 	unsigned long s_ext_extents;
1420 #endif
1421 
1422 	/* for buddy allocator */
1423 	struct ext4_group_info ***s_group_info;
1424 	struct inode *s_buddy_cache;
1425 	spinlock_t s_md_lock;
1426 	unsigned short *s_mb_offsets;
1427 	unsigned int *s_mb_maxs;
1428 	unsigned int s_group_info_size;
1429 
1430 	/* tunables */
1431 	unsigned long s_stripe;
1432 	unsigned int s_mb_stream_request;
1433 	unsigned int s_mb_max_to_scan;
1434 	unsigned int s_mb_min_to_scan;
1435 	unsigned int s_mb_stats;
1436 	unsigned int s_mb_order2_reqs;
1437 	unsigned int s_mb_group_prealloc;
1438 	unsigned int s_max_dir_size_kb;
1439 	/* where last allocation was done - for stream allocation */
1440 	unsigned long s_mb_last_group;
1441 	unsigned long s_mb_last_start;
1442 
1443 	/* stats for buddy allocator */
1444 	atomic_t s_bal_reqs;	/* number of reqs with len > 1 */
1445 	atomic_t s_bal_success;	/* we found long enough chunks */
1446 	atomic_t s_bal_allocated;	/* in blocks */
1447 	atomic_t s_bal_ex_scanned;	/* total extents scanned */
1448 	atomic_t s_bal_goals;	/* goal hits */
1449 	atomic_t s_bal_breaks;	/* too long searches */
1450 	atomic_t s_bal_2orders;	/* 2^order hits */
1451 	spinlock_t s_bal_lock;
1452 	unsigned long s_mb_buddies_generated;
1453 	unsigned long long s_mb_generation_time;
1454 	atomic_t s_mb_lost_chunks;
1455 	atomic_t s_mb_preallocated;
1456 	atomic_t s_mb_discarded;
1457 	atomic_t s_lock_busy;
1458 
1459 	/* locality groups */
1460 	struct ext4_locality_group __percpu *s_locality_groups;
1461 
1462 	/* for write statistics */
1463 	unsigned long s_sectors_written_start;
1464 	u64 s_kbytes_written;
1465 
1466 	/* the size of zero-out chunk */
1467 	unsigned int s_extent_max_zeroout_kb;
1468 
1469 	unsigned int s_log_groups_per_flex;
1470 	struct flex_groups *s_flex_groups;
1471 	ext4_group_t s_flex_groups_allocated;
1472 
1473 	/* workqueue for reserved extent conversions (buffered io) */
1474 	struct workqueue_struct *rsv_conversion_wq;
1475 
1476 	/* timer for periodic error stats printing */
1477 	struct timer_list s_err_report;
1478 
1479 	/* Lazy inode table initialization info */
1480 	struct ext4_li_request *s_li_request;
1481 	/* Wait multiplier for lazy initialization thread */
1482 	unsigned int s_li_wait_mult;
1483 
1484 	/* Kernel thread for multiple mount protection */
1485 	struct task_struct *s_mmp_tsk;
1486 
1487 	/* record the last minlen when FITRIM is called. */
1488 	atomic_t s_last_trim_minblks;
1489 
1490 	/* Reference to checksum algorithm driver via cryptoapi */
1491 	struct crypto_shash *s_chksum_driver;
1492 
1493 	/* Precomputed FS UUID checksum for seeding other checksums */
1494 	__u32 s_csum_seed;
1495 
1496 	/* Reclaim extents from extent status tree */
1497 	struct shrinker s_es_shrinker;
1498 	struct list_head s_es_list;	/* List of inodes with reclaimable extents */
1499 	long s_es_nr_inode;
1500 	struct ext4_es_stats s_es_stats;
1501 	struct mb_cache *s_mb_cache;
1502 	spinlock_t s_es_lock ____cacheline_aligned_in_smp;
1503 
1504 	/* Ratelimit ext4 messages. */
1505 	struct ratelimit_state s_err_ratelimit_state;
1506 	struct ratelimit_state s_warning_ratelimit_state;
1507 	struct ratelimit_state s_msg_ratelimit_state;
1508 };
1509 
1510 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb)
1511 {
1512 	return sb->s_fs_info;
1513 }
1514 static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
1515 {
1516 	return container_of(inode, struct ext4_inode_info, vfs_inode);
1517 }
1518 
1519 static inline struct timespec ext4_current_time(struct inode *inode)
1520 {
1521 	return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ?
1522 		current_fs_time(inode->i_sb) : CURRENT_TIME_SEC;
1523 }
1524 
1525 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
1526 {
1527 	return ino == EXT4_ROOT_INO ||
1528 		ino == EXT4_USR_QUOTA_INO ||
1529 		ino == EXT4_GRP_QUOTA_INO ||
1530 		ino == EXT4_BOOT_LOADER_INO ||
1531 		ino == EXT4_JOURNAL_INO ||
1532 		ino == EXT4_RESIZE_INO ||
1533 		(ino >= EXT4_FIRST_INO(sb) &&
1534 		 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
1535 }
1536 
1537 /*
1538  * Inode dynamic state flags
1539  */
1540 enum {
1541 	EXT4_STATE_JDATA,		/* journaled data exists */
1542 	EXT4_STATE_NEW,			/* inode is newly created */
1543 	EXT4_STATE_XATTR,		/* has in-inode xattrs */
1544 	EXT4_STATE_NO_EXPAND,		/* No space for expansion */
1545 	EXT4_STATE_DA_ALLOC_CLOSE,	/* Alloc DA blks on close */
1546 	EXT4_STATE_EXT_MIGRATE,		/* Inode is migrating */
1547 	EXT4_STATE_DIO_UNWRITTEN,	/* need convert on dio done*/
1548 	EXT4_STATE_NEWENTRY,		/* File just added to dir */
1549 	EXT4_STATE_DIOREAD_LOCK,	/* Disable support for dio read
1550 					   nolocking */
1551 	EXT4_STATE_MAY_INLINE_DATA,	/* may have in-inode data */
1552 	EXT4_STATE_ORDERED_MODE,	/* data=ordered mode */
1553 	EXT4_STATE_EXT_PRECACHED,	/* extents have been precached */
1554 };
1555 
1556 #define EXT4_INODE_BIT_FNS(name, field, offset)				\
1557 static inline int ext4_test_inode_##name(struct inode *inode, int bit)	\
1558 {									\
1559 	return test_bit(bit + (offset), &EXT4_I(inode)->i_##field);	\
1560 }									\
1561 static inline void ext4_set_inode_##name(struct inode *inode, int bit)	\
1562 {									\
1563 	set_bit(bit + (offset), &EXT4_I(inode)->i_##field);		\
1564 }									\
1565 static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \
1566 {									\
1567 	clear_bit(bit + (offset), &EXT4_I(inode)->i_##field);		\
1568 }
1569 
1570 /* Add these declarations here only so that these functions can be
1571  * found by name.  Otherwise, they are very hard to locate. */
1572 static inline int ext4_test_inode_flag(struct inode *inode, int bit);
1573 static inline void ext4_set_inode_flag(struct inode *inode, int bit);
1574 static inline void ext4_clear_inode_flag(struct inode *inode, int bit);
1575 EXT4_INODE_BIT_FNS(flag, flags, 0)
1576 
1577 /* Add these declarations here only so that these functions can be
1578  * found by name.  Otherwise, they are very hard to locate. */
1579 static inline int ext4_test_inode_state(struct inode *inode, int bit);
1580 static inline void ext4_set_inode_state(struct inode *inode, int bit);
1581 static inline void ext4_clear_inode_state(struct inode *inode, int bit);
1582 #if (BITS_PER_LONG < 64)
1583 EXT4_INODE_BIT_FNS(state, state_flags, 0)
1584 
1585 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1586 {
1587 	(ei)->i_state_flags = 0;
1588 }
1589 #else
1590 EXT4_INODE_BIT_FNS(state, flags, 32)
1591 
1592 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1593 {
1594 	/* We depend on the fact that callers will set i_flags */
1595 }
1596 #endif
1597 #else
1598 /* Assume that user mode programs are passing in an ext4fs superblock, not
1599  * a kernel struct super_block.  This will allow us to call the feature-test
1600  * macros from user land. */
1601 #define EXT4_SB(sb)	(sb)
1602 #endif
1603 
1604 /*
1605  * Returns true if the inode is inode is encrypted
1606  */
1607 static inline int ext4_encrypted_inode(struct inode *inode)
1608 {
1609 #ifdef CONFIG_EXT4_FS_ENCRYPTION
1610 	return ext4_test_inode_flag(inode, EXT4_INODE_ENCRYPT);
1611 #else
1612 	return 0;
1613 #endif
1614 }
1615 
1616 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
1617 
1618 /*
1619  * Codes for operating systems
1620  */
1621 #define EXT4_OS_LINUX		0
1622 #define EXT4_OS_HURD		1
1623 #define EXT4_OS_MASIX		2
1624 #define EXT4_OS_FREEBSD		3
1625 #define EXT4_OS_LITES		4
1626 
1627 /*
1628  * Revision levels
1629  */
1630 #define EXT4_GOOD_OLD_REV	0	/* The good old (original) format */
1631 #define EXT4_DYNAMIC_REV	1	/* V2 format w/ dynamic inode sizes */
1632 
1633 #define EXT4_CURRENT_REV	EXT4_GOOD_OLD_REV
1634 #define EXT4_MAX_SUPP_REV	EXT4_DYNAMIC_REV
1635 
1636 #define EXT4_GOOD_OLD_INODE_SIZE 128
1637 
1638 /*
1639  * Feature set definitions
1640  */
1641 
1642 /* Use the ext4_{has,set,clear}_feature_* helpers; these will be removed */
1643 #define EXT4_HAS_COMPAT_FEATURE(sb,mask)			\
1644 	((EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask)) != 0)
1645 #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask)			\
1646 	((EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask)) != 0)
1647 #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask)			\
1648 	((EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask)) != 0)
1649 #define EXT4_SET_COMPAT_FEATURE(sb,mask)			\
1650 	EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
1651 #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask)			\
1652 	EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
1653 #define EXT4_SET_INCOMPAT_FEATURE(sb,mask)			\
1654 	EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
1655 #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask)			\
1656 	EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
1657 #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask)			\
1658 	EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
1659 #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask)			\
1660 	EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
1661 
1662 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC	0x0001
1663 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES	0x0002
1664 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL		0x0004
1665 #define EXT4_FEATURE_COMPAT_EXT_ATTR		0x0008
1666 #define EXT4_FEATURE_COMPAT_RESIZE_INODE	0x0010
1667 #define EXT4_FEATURE_COMPAT_DIR_INDEX		0x0020
1668 #define EXT4_FEATURE_COMPAT_SPARSE_SUPER2	0x0200
1669 
1670 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER	0x0001
1671 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE	0x0002
1672 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR	0x0004
1673 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE        0x0008
1674 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM		0x0010
1675 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK	0x0020
1676 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE	0x0040
1677 #define EXT4_FEATURE_RO_COMPAT_QUOTA		0x0100
1678 #define EXT4_FEATURE_RO_COMPAT_BIGALLOC		0x0200
1679 /*
1680  * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM).  When
1681  * METADATA_CSUM is set, group descriptor checksums use the same algorithm as
1682  * all other data structures' checksums.  However, the METADATA_CSUM and
1683  * GDT_CSUM bits are mutually exclusive.
1684  */
1685 #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM	0x0400
1686 #define EXT4_FEATURE_RO_COMPAT_READONLY		0x1000
1687 #define EXT4_FEATURE_RO_COMPAT_PROJECT		0x2000
1688 
1689 #define EXT4_FEATURE_INCOMPAT_COMPRESSION	0x0001
1690 #define EXT4_FEATURE_INCOMPAT_FILETYPE		0x0002
1691 #define EXT4_FEATURE_INCOMPAT_RECOVER		0x0004 /* Needs recovery */
1692 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV	0x0008 /* Journal device */
1693 #define EXT4_FEATURE_INCOMPAT_META_BG		0x0010
1694 #define EXT4_FEATURE_INCOMPAT_EXTENTS		0x0040 /* extents support */
1695 #define EXT4_FEATURE_INCOMPAT_64BIT		0x0080
1696 #define EXT4_FEATURE_INCOMPAT_MMP               0x0100
1697 #define EXT4_FEATURE_INCOMPAT_FLEX_BG		0x0200
1698 #define EXT4_FEATURE_INCOMPAT_EA_INODE		0x0400 /* EA in inode */
1699 #define EXT4_FEATURE_INCOMPAT_DIRDATA		0x1000 /* data in dirent */
1700 #define EXT4_FEATURE_INCOMPAT_CSUM_SEED		0x2000
1701 #define EXT4_FEATURE_INCOMPAT_LARGEDIR		0x4000 /* >2GB or 3-lvl htree */
1702 #define EXT4_FEATURE_INCOMPAT_INLINE_DATA	0x8000 /* data in inode */
1703 #define EXT4_FEATURE_INCOMPAT_ENCRYPT		0x10000
1704 
1705 #define EXT4_FEATURE_COMPAT_FUNCS(name, flagname) \
1706 static inline bool ext4_has_feature_##name(struct super_block *sb) \
1707 { \
1708 	return ((EXT4_SB(sb)->s_es->s_feature_compat & \
1709 		cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname)) != 0); \
1710 } \
1711 static inline void ext4_set_feature_##name(struct super_block *sb) \
1712 { \
1713 	EXT4_SB(sb)->s_es->s_feature_compat |= \
1714 		cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \
1715 } \
1716 static inline void ext4_clear_feature_##name(struct super_block *sb) \
1717 { \
1718 	EXT4_SB(sb)->s_es->s_feature_compat &= \
1719 		~cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \
1720 }
1721 
1722 #define EXT4_FEATURE_RO_COMPAT_FUNCS(name, flagname) \
1723 static inline bool ext4_has_feature_##name(struct super_block *sb) \
1724 { \
1725 	return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \
1726 		cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname)) != 0); \
1727 } \
1728 static inline void ext4_set_feature_##name(struct super_block *sb) \
1729 { \
1730 	EXT4_SB(sb)->s_es->s_feature_ro_compat |= \
1731 		cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \
1732 } \
1733 static inline void ext4_clear_feature_##name(struct super_block *sb) \
1734 { \
1735 	EXT4_SB(sb)->s_es->s_feature_ro_compat &= \
1736 		~cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \
1737 }
1738 
1739 #define EXT4_FEATURE_INCOMPAT_FUNCS(name, flagname) \
1740 static inline bool ext4_has_feature_##name(struct super_block *sb) \
1741 { \
1742 	return ((EXT4_SB(sb)->s_es->s_feature_incompat & \
1743 		cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname)) != 0); \
1744 } \
1745 static inline void ext4_set_feature_##name(struct super_block *sb) \
1746 { \
1747 	EXT4_SB(sb)->s_es->s_feature_incompat |= \
1748 		cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \
1749 } \
1750 static inline void ext4_clear_feature_##name(struct super_block *sb) \
1751 { \
1752 	EXT4_SB(sb)->s_es->s_feature_incompat &= \
1753 		~cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \
1754 }
1755 
1756 EXT4_FEATURE_COMPAT_FUNCS(dir_prealloc,		DIR_PREALLOC)
1757 EXT4_FEATURE_COMPAT_FUNCS(imagic_inodes,	IMAGIC_INODES)
1758 EXT4_FEATURE_COMPAT_FUNCS(journal,		HAS_JOURNAL)
1759 EXT4_FEATURE_COMPAT_FUNCS(xattr,		EXT_ATTR)
1760 EXT4_FEATURE_COMPAT_FUNCS(resize_inode,		RESIZE_INODE)
1761 EXT4_FEATURE_COMPAT_FUNCS(dir_index,		DIR_INDEX)
1762 EXT4_FEATURE_COMPAT_FUNCS(sparse_super2,	SPARSE_SUPER2)
1763 
1764 EXT4_FEATURE_RO_COMPAT_FUNCS(sparse_super,	SPARSE_SUPER)
1765 EXT4_FEATURE_RO_COMPAT_FUNCS(large_file,	LARGE_FILE)
1766 EXT4_FEATURE_RO_COMPAT_FUNCS(btree_dir,		BTREE_DIR)
1767 EXT4_FEATURE_RO_COMPAT_FUNCS(huge_file,		HUGE_FILE)
1768 EXT4_FEATURE_RO_COMPAT_FUNCS(gdt_csum,		GDT_CSUM)
1769 EXT4_FEATURE_RO_COMPAT_FUNCS(dir_nlink,		DIR_NLINK)
1770 EXT4_FEATURE_RO_COMPAT_FUNCS(extra_isize,	EXTRA_ISIZE)
1771 EXT4_FEATURE_RO_COMPAT_FUNCS(quota,		QUOTA)
1772 EXT4_FEATURE_RO_COMPAT_FUNCS(bigalloc,		BIGALLOC)
1773 EXT4_FEATURE_RO_COMPAT_FUNCS(metadata_csum,	METADATA_CSUM)
1774 EXT4_FEATURE_RO_COMPAT_FUNCS(readonly,		READONLY)
1775 EXT4_FEATURE_RO_COMPAT_FUNCS(project,		PROJECT)
1776 
1777 EXT4_FEATURE_INCOMPAT_FUNCS(compression,	COMPRESSION)
1778 EXT4_FEATURE_INCOMPAT_FUNCS(filetype,		FILETYPE)
1779 EXT4_FEATURE_INCOMPAT_FUNCS(journal_needs_recovery,	RECOVER)
1780 EXT4_FEATURE_INCOMPAT_FUNCS(journal_dev,	JOURNAL_DEV)
1781 EXT4_FEATURE_INCOMPAT_FUNCS(meta_bg,		META_BG)
1782 EXT4_FEATURE_INCOMPAT_FUNCS(extents,		EXTENTS)
1783 EXT4_FEATURE_INCOMPAT_FUNCS(64bit,		64BIT)
1784 EXT4_FEATURE_INCOMPAT_FUNCS(mmp,		MMP)
1785 EXT4_FEATURE_INCOMPAT_FUNCS(flex_bg,		FLEX_BG)
1786 EXT4_FEATURE_INCOMPAT_FUNCS(ea_inode,		EA_INODE)
1787 EXT4_FEATURE_INCOMPAT_FUNCS(dirdata,		DIRDATA)
1788 EXT4_FEATURE_INCOMPAT_FUNCS(csum_seed,		CSUM_SEED)
1789 EXT4_FEATURE_INCOMPAT_FUNCS(largedir,		LARGEDIR)
1790 EXT4_FEATURE_INCOMPAT_FUNCS(inline_data,	INLINE_DATA)
1791 EXT4_FEATURE_INCOMPAT_FUNCS(encrypt,		ENCRYPT)
1792 
1793 #define EXT2_FEATURE_COMPAT_SUPP	EXT4_FEATURE_COMPAT_EXT_ATTR
1794 #define EXT2_FEATURE_INCOMPAT_SUPP	(EXT4_FEATURE_INCOMPAT_FILETYPE| \
1795 					 EXT4_FEATURE_INCOMPAT_META_BG)
1796 #define EXT2_FEATURE_RO_COMPAT_SUPP	(EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1797 					 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1798 					 EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
1799 
1800 #define EXT3_FEATURE_COMPAT_SUPP	EXT4_FEATURE_COMPAT_EXT_ATTR
1801 #define EXT3_FEATURE_INCOMPAT_SUPP	(EXT4_FEATURE_INCOMPAT_FILETYPE| \
1802 					 EXT4_FEATURE_INCOMPAT_RECOVER| \
1803 					 EXT4_FEATURE_INCOMPAT_META_BG)
1804 #define EXT3_FEATURE_RO_COMPAT_SUPP	(EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1805 					 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1806 					 EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
1807 
1808 #define EXT4_FEATURE_COMPAT_SUPP	EXT4_FEATURE_COMPAT_EXT_ATTR
1809 #define EXT4_FEATURE_INCOMPAT_SUPP	(EXT4_FEATURE_INCOMPAT_FILETYPE| \
1810 					 EXT4_FEATURE_INCOMPAT_RECOVER| \
1811 					 EXT4_FEATURE_INCOMPAT_META_BG| \
1812 					 EXT4_FEATURE_INCOMPAT_EXTENTS| \
1813 					 EXT4_FEATURE_INCOMPAT_64BIT| \
1814 					 EXT4_FEATURE_INCOMPAT_FLEX_BG| \
1815 					 EXT4_FEATURE_INCOMPAT_MMP | \
1816 					 EXT4_FEATURE_INCOMPAT_INLINE_DATA | \
1817 					 EXT4_FEATURE_INCOMPAT_ENCRYPT | \
1818 					 EXT4_FEATURE_INCOMPAT_CSUM_SEED)
1819 #define EXT4_FEATURE_RO_COMPAT_SUPP	(EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1820 					 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1821 					 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
1822 					 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
1823 					 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
1824 					 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
1825 					 EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\
1826 					 EXT4_FEATURE_RO_COMPAT_BIGALLOC |\
1827 					 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\
1828 					 EXT4_FEATURE_RO_COMPAT_QUOTA |\
1829 					 EXT4_FEATURE_RO_COMPAT_PROJECT)
1830 
1831 #define EXTN_FEATURE_FUNCS(ver) \
1832 static inline bool ext4_has_unknown_ext##ver##_compat_features(struct super_block *sb) \
1833 { \
1834 	return ((EXT4_SB(sb)->s_es->s_feature_compat & \
1835 		cpu_to_le32(~EXT##ver##_FEATURE_COMPAT_SUPP)) != 0); \
1836 } \
1837 static inline bool ext4_has_unknown_ext##ver##_ro_compat_features(struct super_block *sb) \
1838 { \
1839 	return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \
1840 		cpu_to_le32(~EXT##ver##_FEATURE_RO_COMPAT_SUPP)) != 0); \
1841 } \
1842 static inline bool ext4_has_unknown_ext##ver##_incompat_features(struct super_block *sb) \
1843 { \
1844 	return ((EXT4_SB(sb)->s_es->s_feature_incompat & \
1845 		cpu_to_le32(~EXT##ver##_FEATURE_INCOMPAT_SUPP)) != 0); \
1846 }
1847 
1848 EXTN_FEATURE_FUNCS(2)
1849 EXTN_FEATURE_FUNCS(3)
1850 EXTN_FEATURE_FUNCS(4)
1851 
1852 static inline bool ext4_has_compat_features(struct super_block *sb)
1853 {
1854 	return (EXT4_SB(sb)->s_es->s_feature_compat != 0);
1855 }
1856 static inline bool ext4_has_ro_compat_features(struct super_block *sb)
1857 {
1858 	return (EXT4_SB(sb)->s_es->s_feature_ro_compat != 0);
1859 }
1860 static inline bool ext4_has_incompat_features(struct super_block *sb)
1861 {
1862 	return (EXT4_SB(sb)->s_es->s_feature_incompat != 0);
1863 }
1864 
1865 /*
1866  * Default values for user and/or group using reserved blocks
1867  */
1868 #define	EXT4_DEF_RESUID		0
1869 #define	EXT4_DEF_RESGID		0
1870 
1871 /*
1872  * Default project ID
1873  */
1874 #define	EXT4_DEF_PROJID		0
1875 
1876 #define EXT4_DEF_INODE_READAHEAD_BLKS	32
1877 
1878 /*
1879  * Default mount options
1880  */
1881 #define EXT4_DEFM_DEBUG		0x0001
1882 #define EXT4_DEFM_BSDGROUPS	0x0002
1883 #define EXT4_DEFM_XATTR_USER	0x0004
1884 #define EXT4_DEFM_ACL		0x0008
1885 #define EXT4_DEFM_UID16		0x0010
1886 #define EXT4_DEFM_JMODE		0x0060
1887 #define EXT4_DEFM_JMODE_DATA	0x0020
1888 #define EXT4_DEFM_JMODE_ORDERED	0x0040
1889 #define EXT4_DEFM_JMODE_WBACK	0x0060
1890 #define EXT4_DEFM_NOBARRIER	0x0100
1891 #define EXT4_DEFM_BLOCK_VALIDITY 0x0200
1892 #define EXT4_DEFM_DISCARD	0x0400
1893 #define EXT4_DEFM_NODELALLOC	0x0800
1894 
1895 /*
1896  * Default journal batch times
1897  */
1898 #define EXT4_DEF_MIN_BATCH_TIME	0
1899 #define EXT4_DEF_MAX_BATCH_TIME	15000 /* 15ms */
1900 
1901 /*
1902  * Minimum number of groups in a flexgroup before we separate out
1903  * directories into the first block group of a flexgroup
1904  */
1905 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME	4
1906 
1907 /*
1908  * Structure of a directory entry
1909  */
1910 #define EXT4_NAME_LEN 255
1911 
1912 struct ext4_dir_entry {
1913 	__le32	inode;			/* Inode number */
1914 	__le16	rec_len;		/* Directory entry length */
1915 	__le16	name_len;		/* Name length */
1916 	char	name[EXT4_NAME_LEN];	/* File name */
1917 };
1918 
1919 /*
1920  * The new version of the directory entry.  Since EXT4 structures are
1921  * stored in intel byte order, and the name_len field could never be
1922  * bigger than 255 chars, it's safe to reclaim the extra byte for the
1923  * file_type field.
1924  */
1925 struct ext4_dir_entry_2 {
1926 	__le32	inode;			/* Inode number */
1927 	__le16	rec_len;		/* Directory entry length */
1928 	__u8	name_len;		/* Name length */
1929 	__u8	file_type;
1930 	char	name[EXT4_NAME_LEN];	/* File name */
1931 };
1932 
1933 /*
1934  * This is a bogus directory entry at the end of each leaf block that
1935  * records checksums.
1936  */
1937 struct ext4_dir_entry_tail {
1938 	__le32	det_reserved_zero1;	/* Pretend to be unused */
1939 	__le16	det_rec_len;		/* 12 */
1940 	__u8	det_reserved_zero2;	/* Zero name length */
1941 	__u8	det_reserved_ft;	/* 0xDE, fake file type */
1942 	__le32	det_checksum;		/* crc32c(uuid+inum+dirblock) */
1943 };
1944 
1945 #define EXT4_DIRENT_TAIL(block, blocksize) \
1946 	((struct ext4_dir_entry_tail *)(((void *)(block)) + \
1947 					((blocksize) - \
1948 					 sizeof(struct ext4_dir_entry_tail))))
1949 
1950 /*
1951  * Ext4 directory file types.  Only the low 3 bits are used.  The
1952  * other bits are reserved for now.
1953  */
1954 #define EXT4_FT_UNKNOWN		0
1955 #define EXT4_FT_REG_FILE	1
1956 #define EXT4_FT_DIR		2
1957 #define EXT4_FT_CHRDEV		3
1958 #define EXT4_FT_BLKDEV		4
1959 #define EXT4_FT_FIFO		5
1960 #define EXT4_FT_SOCK		6
1961 #define EXT4_FT_SYMLINK		7
1962 
1963 #define EXT4_FT_MAX		8
1964 
1965 #define EXT4_FT_DIR_CSUM	0xDE
1966 
1967 /*
1968  * EXT4_DIR_PAD defines the directory entries boundaries
1969  *
1970  * NOTE: It must be a multiple of 4
1971  */
1972 #define EXT4_DIR_PAD			4
1973 #define EXT4_DIR_ROUND			(EXT4_DIR_PAD - 1)
1974 #define EXT4_DIR_REC_LEN(name_len)	(((name_len) + 8 + EXT4_DIR_ROUND) & \
1975 					 ~EXT4_DIR_ROUND)
1976 #define EXT4_MAX_REC_LEN		((1<<16)-1)
1977 
1978 /*
1979  * If we ever get support for fs block sizes > page_size, we'll need
1980  * to remove the #if statements in the next two functions...
1981  */
1982 static inline unsigned int
1983 ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize)
1984 {
1985 	unsigned len = le16_to_cpu(dlen);
1986 
1987 #if (PAGE_SIZE >= 65536)
1988 	if (len == EXT4_MAX_REC_LEN || len == 0)
1989 		return blocksize;
1990 	return (len & 65532) | ((len & 3) << 16);
1991 #else
1992 	return len;
1993 #endif
1994 }
1995 
1996 static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize)
1997 {
1998 	if ((len > blocksize) || (blocksize > (1 << 18)) || (len & 3))
1999 		BUG();
2000 #if (PAGE_SIZE >= 65536)
2001 	if (len < 65536)
2002 		return cpu_to_le16(len);
2003 	if (len == blocksize) {
2004 		if (blocksize == 65536)
2005 			return cpu_to_le16(EXT4_MAX_REC_LEN);
2006 		else
2007 			return cpu_to_le16(0);
2008 	}
2009 	return cpu_to_le16((len & 65532) | ((len >> 16) & 3));
2010 #else
2011 	return cpu_to_le16(len);
2012 #endif
2013 }
2014 
2015 /*
2016  * Hash Tree Directory indexing
2017  * (c) Daniel Phillips, 2001
2018  */
2019 
2020 #define is_dx(dir) (ext4_has_feature_dir_index((dir)->i_sb) && \
2021 		    ext4_test_inode_flag((dir), EXT4_INODE_INDEX))
2022 #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX)
2023 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
2024 
2025 /* Legal values for the dx_root hash_version field: */
2026 
2027 #define DX_HASH_LEGACY		0
2028 #define DX_HASH_HALF_MD4	1
2029 #define DX_HASH_TEA		2
2030 #define DX_HASH_LEGACY_UNSIGNED	3
2031 #define DX_HASH_HALF_MD4_UNSIGNED	4
2032 #define DX_HASH_TEA_UNSIGNED		5
2033 
2034 static inline u32 ext4_chksum(struct ext4_sb_info *sbi, u32 crc,
2035 			      const void *address, unsigned int length)
2036 {
2037 	struct {
2038 		struct shash_desc shash;
2039 		char ctx[4];
2040 	} desc;
2041 	int err;
2042 
2043 	BUG_ON(crypto_shash_descsize(sbi->s_chksum_driver)!=sizeof(desc.ctx));
2044 
2045 	desc.shash.tfm = sbi->s_chksum_driver;
2046 	desc.shash.flags = 0;
2047 	*(u32 *)desc.ctx = crc;
2048 
2049 	err = crypto_shash_update(&desc.shash, address, length);
2050 	BUG_ON(err);
2051 
2052 	return *(u32 *)desc.ctx;
2053 }
2054 
2055 #ifdef __KERNEL__
2056 
2057 /* hash info structure used by the directory hash */
2058 struct dx_hash_info
2059 {
2060 	u32		hash;
2061 	u32		minor_hash;
2062 	int		hash_version;
2063 	u32		*seed;
2064 };
2065 
2066 
2067 /* 32 and 64 bit signed EOF for dx directories */
2068 #define EXT4_HTREE_EOF_32BIT   ((1UL  << (32 - 1)) - 1)
2069 #define EXT4_HTREE_EOF_64BIT   ((1ULL << (64 - 1)) - 1)
2070 
2071 
2072 /*
2073  * Control parameters used by ext4_htree_next_block
2074  */
2075 #define HASH_NB_ALWAYS		1
2076 
2077 struct ext4_filename {
2078 	const struct qstr *usr_fname;
2079 	struct ext4_str disk_name;
2080 	struct dx_hash_info hinfo;
2081 #ifdef CONFIG_EXT4_FS_ENCRYPTION
2082 	struct ext4_str crypto_buf;
2083 #endif
2084 };
2085 
2086 #define fname_name(p) ((p)->disk_name.name)
2087 #define fname_len(p)  ((p)->disk_name.len)
2088 
2089 /*
2090  * Describe an inode's exact location on disk and in memory
2091  */
2092 struct ext4_iloc
2093 {
2094 	struct buffer_head *bh;
2095 	unsigned long offset;
2096 	ext4_group_t block_group;
2097 };
2098 
2099 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
2100 {
2101 	return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
2102 }
2103 
2104 /*
2105  * This structure is stuffed into the struct file's private_data field
2106  * for directories.  It is where we put information so that we can do
2107  * readdir operations in hash tree order.
2108  */
2109 struct dir_private_info {
2110 	struct rb_root	root;
2111 	struct rb_node	*curr_node;
2112 	struct fname	*extra_fname;
2113 	loff_t		last_pos;
2114 	__u32		curr_hash;
2115 	__u32		curr_minor_hash;
2116 	__u32		next_hash;
2117 };
2118 
2119 /* calculate the first block number of the group */
2120 static inline ext4_fsblk_t
2121 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no)
2122 {
2123 	return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
2124 		le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
2125 }
2126 
2127 /*
2128  * Special error return code only used by dx_probe() and its callers.
2129  */
2130 #define ERR_BAD_DX_DIR	(-(MAX_ERRNO - 1))
2131 
2132 /*
2133  * Timeout and state flag for lazy initialization inode thread.
2134  */
2135 #define EXT4_DEF_LI_WAIT_MULT			10
2136 #define EXT4_DEF_LI_MAX_START_DELAY		5
2137 #define EXT4_LAZYINIT_QUIT			0x0001
2138 #define EXT4_LAZYINIT_RUNNING			0x0002
2139 
2140 /*
2141  * Lazy inode table initialization info
2142  */
2143 struct ext4_lazy_init {
2144 	unsigned long		li_state;
2145 	struct list_head	li_request_list;
2146 	struct mutex		li_list_mtx;
2147 };
2148 
2149 struct ext4_li_request {
2150 	struct super_block	*lr_super;
2151 	struct ext4_sb_info	*lr_sbi;
2152 	ext4_group_t		lr_next_group;
2153 	struct list_head	lr_request;
2154 	unsigned long		lr_next_sched;
2155 	unsigned long		lr_timeout;
2156 };
2157 
2158 struct ext4_features {
2159 	struct kobject f_kobj;
2160 	struct completion f_kobj_unregister;
2161 };
2162 
2163 /*
2164  * This structure will be used for multiple mount protection. It will be
2165  * written into the block number saved in the s_mmp_block field in the
2166  * superblock. Programs that check MMP should assume that if
2167  * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe
2168  * to use the filesystem, regardless of how old the timestamp is.
2169  */
2170 #define EXT4_MMP_MAGIC     0x004D4D50U /* ASCII for MMP */
2171 #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */
2172 #define EXT4_MMP_SEQ_FSCK  0xE24D4D50U /* mmp_seq value when being fscked */
2173 #define EXT4_MMP_SEQ_MAX   0xE24D4D4FU /* maximum valid mmp_seq value */
2174 
2175 struct mmp_struct {
2176 	__le32	mmp_magic;		/* Magic number for MMP */
2177 	__le32	mmp_seq;		/* Sequence no. updated periodically */
2178 
2179 	/*
2180 	 * mmp_time, mmp_nodename & mmp_bdevname are only used for information
2181 	 * purposes and do not affect the correctness of the algorithm
2182 	 */
2183 	__le64	mmp_time;		/* Time last updated */
2184 	char	mmp_nodename[64];	/* Node which last updated MMP block */
2185 	char	mmp_bdevname[32];	/* Bdev which last updated MMP block */
2186 
2187 	/*
2188 	 * mmp_check_interval is used to verify if the MMP block has been
2189 	 * updated on the block device. The value is updated based on the
2190 	 * maximum time to write the MMP block during an update cycle.
2191 	 */
2192 	__le16	mmp_check_interval;
2193 
2194 	__le16	mmp_pad1;
2195 	__le32	mmp_pad2[226];
2196 	__le32	mmp_checksum;		/* crc32c(uuid+mmp_block) */
2197 };
2198 
2199 /* arguments passed to the mmp thread */
2200 struct mmpd_data {
2201 	struct buffer_head *bh; /* bh from initial read_mmp_block() */
2202 	struct super_block *sb;  /* super block of the fs */
2203 };
2204 
2205 /*
2206  * Check interval multiplier
2207  * The MMP block is written every update interval and initially checked every
2208  * update interval x the multiplier (the value is then adapted based on the
2209  * write latency). The reason is that writes can be delayed under load and we
2210  * don't want readers to incorrectly assume that the filesystem is no longer
2211  * in use.
2212  */
2213 #define EXT4_MMP_CHECK_MULT		2UL
2214 
2215 /*
2216  * Minimum interval for MMP checking in seconds.
2217  */
2218 #define EXT4_MMP_MIN_CHECK_INTERVAL	5UL
2219 
2220 /*
2221  * Maximum interval for MMP checking in seconds.
2222  */
2223 #define EXT4_MMP_MAX_CHECK_INTERVAL	300UL
2224 
2225 /*
2226  * Function prototypes
2227  */
2228 
2229 /*
2230  * Ok, these declarations are also in <linux/kernel.h> but none of the
2231  * ext4 source programs needs to include it so they are duplicated here.
2232  */
2233 # define NORET_TYPE	/**/
2234 # define ATTRIB_NORET	__attribute__((noreturn))
2235 # define NORET_AND	noreturn,
2236 
2237 /* bitmap.c */
2238 extern unsigned int ext4_count_free(char *bitmap, unsigned numchars);
2239 void ext4_inode_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
2240 				struct ext4_group_desc *gdp,
2241 				struct buffer_head *bh, int sz);
2242 int ext4_inode_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
2243 				  struct ext4_group_desc *gdp,
2244 				  struct buffer_head *bh, int sz);
2245 void ext4_block_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
2246 				struct ext4_group_desc *gdp,
2247 				struct buffer_head *bh);
2248 int ext4_block_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
2249 				  struct ext4_group_desc *gdp,
2250 				  struct buffer_head *bh);
2251 
2252 /* balloc.c */
2253 extern void ext4_get_group_no_and_offset(struct super_block *sb,
2254 					 ext4_fsblk_t blocknr,
2255 					 ext4_group_t *blockgrpp,
2256 					 ext4_grpblk_t *offsetp);
2257 extern ext4_group_t ext4_get_group_number(struct super_block *sb,
2258 					  ext4_fsblk_t block);
2259 
2260 extern unsigned int ext4_block_group(struct super_block *sb,
2261 			ext4_fsblk_t blocknr);
2262 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb,
2263 			ext4_fsblk_t blocknr);
2264 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group);
2265 extern unsigned long ext4_bg_num_gdb(struct super_block *sb,
2266 			ext4_group_t group);
2267 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,
2268 					 ext4_fsblk_t goal,
2269 					 unsigned int flags,
2270 					 unsigned long *count,
2271 					 int *errp);
2272 extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi,
2273 				    s64 nclusters, unsigned int flags);
2274 extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *);
2275 extern void ext4_check_blocks_bitmap(struct super_block *);
2276 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
2277 						    ext4_group_t block_group,
2278 						    struct buffer_head ** bh);
2279 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
2280 
2281 extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb,
2282 						ext4_group_t block_group);
2283 extern int ext4_wait_block_bitmap(struct super_block *sb,
2284 				  ext4_group_t block_group,
2285 				  struct buffer_head *bh);
2286 extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb,
2287 						  ext4_group_t block_group);
2288 extern unsigned ext4_free_clusters_after_init(struct super_block *sb,
2289 					      ext4_group_t block_group,
2290 					      struct ext4_group_desc *gdp);
2291 ext4_fsblk_t ext4_inode_to_goal_block(struct inode *);
2292 
2293 /* crypto_policy.c */
2294 int ext4_is_child_context_consistent_with_parent(struct inode *parent,
2295 						 struct inode *child);
2296 int ext4_inherit_context(struct inode *parent, struct inode *child);
2297 void ext4_to_hex(char *dst, char *src, size_t src_size);
2298 int ext4_process_policy(const struct ext4_encryption_policy *policy,
2299 			struct inode *inode);
2300 int ext4_get_policy(struct inode *inode,
2301 		    struct ext4_encryption_policy *policy);
2302 
2303 /* crypto.c */
2304 extern struct kmem_cache *ext4_crypt_info_cachep;
2305 bool ext4_valid_contents_enc_mode(uint32_t mode);
2306 uint32_t ext4_validate_encryption_key_size(uint32_t mode, uint32_t size);
2307 extern struct workqueue_struct *ext4_read_workqueue;
2308 struct ext4_crypto_ctx *ext4_get_crypto_ctx(struct inode *inode,
2309 					    gfp_t gfp_flags);
2310 void ext4_release_crypto_ctx(struct ext4_crypto_ctx *ctx);
2311 void ext4_restore_control_page(struct page *data_page);
2312 struct page *ext4_encrypt(struct inode *inode,
2313 			  struct page *plaintext_page,
2314 			  gfp_t gfp_flags);
2315 int ext4_decrypt(struct page *page);
2316 int ext4_encrypted_zeroout(struct inode *inode, ext4_lblk_t lblk,
2317 			   ext4_fsblk_t pblk, ext4_lblk_t len);
2318 extern const struct dentry_operations ext4_encrypted_d_ops;
2319 
2320 #ifdef CONFIG_EXT4_FS_ENCRYPTION
2321 int ext4_init_crypto(void);
2322 void ext4_exit_crypto(void);
2323 static inline int ext4_sb_has_crypto(struct super_block *sb)
2324 {
2325 	return ext4_has_feature_encrypt(sb);
2326 }
2327 #else
2328 static inline int ext4_init_crypto(void) { return 0; }
2329 static inline void ext4_exit_crypto(void) { }
2330 static inline int ext4_sb_has_crypto(struct super_block *sb)
2331 {
2332 	return 0;
2333 }
2334 #endif
2335 
2336 /* crypto_fname.c */
2337 bool ext4_valid_filenames_enc_mode(uint32_t mode);
2338 u32 ext4_fname_crypto_round_up(u32 size, u32 blksize);
2339 unsigned ext4_fname_encrypted_size(struct inode *inode, u32 ilen);
2340 int ext4_fname_crypto_alloc_buffer(struct inode *inode,
2341 				   u32 ilen, struct ext4_str *crypto_str);
2342 int _ext4_fname_disk_to_usr(struct inode *inode,
2343 			    struct dx_hash_info *hinfo,
2344 			    const struct ext4_str *iname,
2345 			    struct ext4_str *oname);
2346 int ext4_fname_disk_to_usr(struct inode *inode,
2347 			   struct dx_hash_info *hinfo,
2348 			   const struct ext4_dir_entry_2 *de,
2349 			   struct ext4_str *oname);
2350 int ext4_fname_usr_to_disk(struct inode *inode,
2351 			   const struct qstr *iname,
2352 			   struct ext4_str *oname);
2353 #ifdef CONFIG_EXT4_FS_ENCRYPTION
2354 void ext4_fname_crypto_free_buffer(struct ext4_str *crypto_str);
2355 int ext4_fname_setup_filename(struct inode *dir, const struct qstr *iname,
2356 			      int lookup, struct ext4_filename *fname);
2357 void ext4_fname_free_filename(struct ext4_filename *fname);
2358 #else
2359 static inline
2360 int ext4_setup_fname_crypto(struct inode *inode)
2361 {
2362 	return 0;
2363 }
2364 static inline void ext4_fname_crypto_free_buffer(struct ext4_str *p) { }
2365 static inline int ext4_fname_setup_filename(struct inode *dir,
2366 				     const struct qstr *iname,
2367 				     int lookup, struct ext4_filename *fname)
2368 {
2369 	fname->usr_fname = iname;
2370 	fname->disk_name.name = (unsigned char *) iname->name;
2371 	fname->disk_name.len = iname->len;
2372 	return 0;
2373 }
2374 static inline void ext4_fname_free_filename(struct ext4_filename *fname) { }
2375 #endif
2376 
2377 
2378 /* crypto_key.c */
2379 void ext4_free_crypt_info(struct ext4_crypt_info *ci);
2380 void ext4_free_encryption_info(struct inode *inode, struct ext4_crypt_info *ci);
2381 int _ext4_get_encryption_info(struct inode *inode);
2382 
2383 #ifdef CONFIG_EXT4_FS_ENCRYPTION
2384 int ext4_has_encryption_key(struct inode *inode);
2385 
2386 static inline int ext4_get_encryption_info(struct inode *inode)
2387 {
2388 	struct ext4_crypt_info *ci = EXT4_I(inode)->i_crypt_info;
2389 
2390 	if (!ci ||
2391 	    (ci->ci_keyring_key &&
2392 	     (ci->ci_keyring_key->flags & ((1 << KEY_FLAG_INVALIDATED) |
2393 					   (1 << KEY_FLAG_REVOKED) |
2394 					   (1 << KEY_FLAG_DEAD)))))
2395 		return _ext4_get_encryption_info(inode);
2396 	return 0;
2397 }
2398 
2399 static inline struct ext4_crypt_info *ext4_encryption_info(struct inode *inode)
2400 {
2401 	return EXT4_I(inode)->i_crypt_info;
2402 }
2403 
2404 #else
2405 static inline int ext4_has_encryption_key(struct inode *inode)
2406 {
2407 	return 0;
2408 }
2409 static inline int ext4_get_encryption_info(struct inode *inode)
2410 {
2411 	return 0;
2412 }
2413 static inline struct ext4_crypt_info *ext4_encryption_info(struct inode *inode)
2414 {
2415 	return NULL;
2416 }
2417 #endif
2418 
2419 
2420 /* dir.c */
2421 extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *,
2422 				  struct file *,
2423 				  struct ext4_dir_entry_2 *,
2424 				  struct buffer_head *, char *, int,
2425 				  unsigned int);
2426 #define ext4_check_dir_entry(dir, filp, de, bh, buf, size, offset)	\
2427 	unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \
2428 					(de), (bh), (buf), (size), (offset)))
2429 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
2430 				__u32 minor_hash,
2431 				struct ext4_dir_entry_2 *dirent,
2432 				struct ext4_str *ent_name);
2433 extern void ext4_htree_free_dir_info(struct dir_private_info *p);
2434 extern int ext4_find_dest_de(struct inode *dir, struct inode *inode,
2435 			     struct buffer_head *bh,
2436 			     void *buf, int buf_size,
2437 			     struct ext4_filename *fname,
2438 			     struct ext4_dir_entry_2 **dest_de);
2439 int ext4_insert_dentry(struct inode *dir,
2440 		       struct inode *inode,
2441 		       struct ext4_dir_entry_2 *de,
2442 		       int buf_size,
2443 		       struct ext4_filename *fname);
2444 static inline void ext4_update_dx_flag(struct inode *inode)
2445 {
2446 	if (!ext4_has_feature_dir_index(inode->i_sb))
2447 		ext4_clear_inode_flag(inode, EXT4_INODE_INDEX);
2448 }
2449 static unsigned char ext4_filetype_table[] = {
2450 	DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK
2451 };
2452 
2453 static inline  unsigned char get_dtype(struct super_block *sb, int filetype)
2454 {
2455 	if (!ext4_has_feature_filetype(sb) || filetype >= EXT4_FT_MAX)
2456 		return DT_UNKNOWN;
2457 
2458 	return ext4_filetype_table[filetype];
2459 }
2460 extern int ext4_check_all_de(struct inode *dir, struct buffer_head *bh,
2461 			     void *buf, int buf_size);
2462 
2463 /* fsync.c */
2464 extern int ext4_sync_file(struct file *, loff_t, loff_t, int);
2465 
2466 /* hash.c */
2467 extern int ext4fs_dirhash(const char *name, int len, struct
2468 			  dx_hash_info *hinfo);
2469 
2470 /* ialloc.c */
2471 extern struct inode *__ext4_new_inode(handle_t *, struct inode *, umode_t,
2472 				      const struct qstr *qstr, __u32 goal,
2473 				      uid_t *owner, int handle_type,
2474 				      unsigned int line_no, int nblocks);
2475 
2476 #define ext4_new_inode(handle, dir, mode, qstr, goal, owner) \
2477 	__ext4_new_inode((handle), (dir), (mode), (qstr), (goal), (owner), \
2478 			 0, 0, 0)
2479 #define ext4_new_inode_start_handle(dir, mode, qstr, goal, owner, \
2480 				    type, nblocks)		    \
2481 	__ext4_new_inode(NULL, (dir), (mode), (qstr), (goal), (owner), \
2482 			 (type), __LINE__, (nblocks))
2483 
2484 
2485 extern void ext4_free_inode(handle_t *, struct inode *);
2486 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long);
2487 extern unsigned long ext4_count_free_inodes(struct super_block *);
2488 extern unsigned long ext4_count_dirs(struct super_block *);
2489 extern void ext4_check_inodes_bitmap(struct super_block *);
2490 extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap);
2491 extern int ext4_init_inode_table(struct super_block *sb,
2492 				 ext4_group_t group, int barrier);
2493 extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate);
2494 
2495 /* mballoc.c */
2496 extern const struct file_operations ext4_seq_mb_groups_fops;
2497 extern long ext4_mb_stats;
2498 extern long ext4_mb_max_to_scan;
2499 extern int ext4_mb_init(struct super_block *);
2500 extern int ext4_mb_release(struct super_block *);
2501 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *,
2502 				struct ext4_allocation_request *, int *);
2503 extern int ext4_mb_reserve_blocks(struct super_block *, int);
2504 extern void ext4_discard_preallocations(struct inode *);
2505 extern int __init ext4_init_mballoc(void);
2506 extern void ext4_exit_mballoc(void);
2507 extern void ext4_free_blocks(handle_t *handle, struct inode *inode,
2508 			     struct buffer_head *bh, ext4_fsblk_t block,
2509 			     unsigned long count, int flags);
2510 extern int ext4_mb_alloc_groupinfo(struct super_block *sb,
2511 				   ext4_group_t ngroups);
2512 extern int ext4_mb_add_groupinfo(struct super_block *sb,
2513 		ext4_group_t i, struct ext4_group_desc *desc);
2514 extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb,
2515 				ext4_fsblk_t block, unsigned long count);
2516 extern int ext4_trim_fs(struct super_block *, struct fstrim_range *);
2517 
2518 /* inode.c */
2519 int ext4_inode_is_fast_symlink(struct inode *inode);
2520 struct buffer_head *ext4_getblk(handle_t *, struct inode *, ext4_lblk_t, int);
2521 struct buffer_head *ext4_bread(handle_t *, struct inode *, ext4_lblk_t, int);
2522 int ext4_get_block_unwritten(struct inode *inode, sector_t iblock,
2523 			     struct buffer_head *bh_result, int create);
2524 int ext4_dax_mmap_get_block(struct inode *inode, sector_t iblock,
2525 			    struct buffer_head *bh_result, int create);
2526 int ext4_get_block(struct inode *inode, sector_t iblock,
2527 		   struct buffer_head *bh_result, int create);
2528 int ext4_dio_get_block(struct inode *inode, sector_t iblock,
2529 		       struct buffer_head *bh_result, int create);
2530 int ext4_da_get_block_prep(struct inode *inode, sector_t iblock,
2531 			   struct buffer_head *bh, int create);
2532 int ext4_walk_page_buffers(handle_t *handle,
2533 			   struct buffer_head *head,
2534 			   unsigned from,
2535 			   unsigned to,
2536 			   int *partial,
2537 			   int (*fn)(handle_t *handle,
2538 				     struct buffer_head *bh));
2539 int do_journal_get_write_access(handle_t *handle,
2540 				struct buffer_head *bh);
2541 #define FALL_BACK_TO_NONDELALLOC 1
2542 #define CONVERT_INLINE_DATA	 2
2543 
2544 extern struct inode *ext4_iget(struct super_block *, unsigned long);
2545 extern struct inode *ext4_iget_normal(struct super_block *, unsigned long);
2546 extern int  ext4_write_inode(struct inode *, struct writeback_control *);
2547 extern int  ext4_setattr(struct dentry *, struct iattr *);
2548 extern int  ext4_getattr(struct vfsmount *mnt, struct dentry *dentry,
2549 				struct kstat *stat);
2550 extern void ext4_evict_inode(struct inode *);
2551 extern void ext4_clear_inode(struct inode *);
2552 extern int  ext4_sync_inode(handle_t *, struct inode *);
2553 extern void ext4_dirty_inode(struct inode *, int);
2554 extern int ext4_change_inode_journal_flag(struct inode *, int);
2555 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
2556 extern int ext4_inode_attach_jinode(struct inode *inode);
2557 extern int ext4_can_truncate(struct inode *inode);
2558 extern void ext4_truncate(struct inode *);
2559 extern int ext4_punch_hole(struct inode *inode, loff_t offset, loff_t length);
2560 extern int ext4_truncate_restart_trans(handle_t *, struct inode *, int nblocks);
2561 extern void ext4_set_inode_flags(struct inode *);
2562 extern void ext4_get_inode_flags(struct ext4_inode_info *);
2563 extern int ext4_alloc_da_blocks(struct inode *inode);
2564 extern void ext4_set_aops(struct inode *inode);
2565 extern int ext4_writepage_trans_blocks(struct inode *);
2566 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks);
2567 extern int ext4_zero_partial_blocks(handle_t *handle, struct inode *inode,
2568 			     loff_t lstart, loff_t lend);
2569 extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf);
2570 extern int ext4_filemap_fault(struct vm_area_struct *vma, struct vm_fault *vmf);
2571 extern qsize_t *ext4_get_reserved_space(struct inode *inode);
2572 extern int ext4_get_projid(struct inode *inode, kprojid_t *projid);
2573 extern void ext4_da_update_reserve_space(struct inode *inode,
2574 					int used, int quota_claim);
2575 extern int ext4_issue_zeroout(struct inode *inode, ext4_lblk_t lblk,
2576 			      ext4_fsblk_t pblk, ext4_lblk_t len);
2577 extern int ext4_get_next_extent(struct inode *inode, ext4_lblk_t lblk,
2578 				unsigned int map_len,
2579 				struct extent_status *result);
2580 
2581 /* indirect.c */
2582 extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode,
2583 				struct ext4_map_blocks *map, int flags);
2584 extern ssize_t ext4_ind_direct_IO(struct kiocb *iocb, struct iov_iter *iter,
2585 				  loff_t offset);
2586 extern int ext4_ind_calc_metadata_amount(struct inode *inode, sector_t lblock);
2587 extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks);
2588 extern void ext4_ind_truncate(handle_t *, struct inode *inode);
2589 extern int ext4_ind_remove_space(handle_t *handle, struct inode *inode,
2590 				 ext4_lblk_t start, ext4_lblk_t end);
2591 
2592 /* ioctl.c */
2593 extern long ext4_ioctl(struct file *, unsigned int, unsigned long);
2594 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long);
2595 
2596 /* migrate.c */
2597 extern int ext4_ext_migrate(struct inode *);
2598 extern int ext4_ind_migrate(struct inode *inode);
2599 
2600 /* namei.c */
2601 extern int ext4_dirent_csum_verify(struct inode *inode,
2602 				   struct ext4_dir_entry *dirent);
2603 extern int ext4_orphan_add(handle_t *, struct inode *);
2604 extern int ext4_orphan_del(handle_t *, struct inode *);
2605 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
2606 				__u32 start_minor_hash, __u32 *next_hash);
2607 extern int ext4_search_dir(struct buffer_head *bh,
2608 			   char *search_buf,
2609 			   int buf_size,
2610 			   struct inode *dir,
2611 			   struct ext4_filename *fname,
2612 			   const struct qstr *d_name,
2613 			   unsigned int offset,
2614 			   struct ext4_dir_entry_2 **res_dir);
2615 extern int ext4_generic_delete_entry(handle_t *handle,
2616 				     struct inode *dir,
2617 				     struct ext4_dir_entry_2 *de_del,
2618 				     struct buffer_head *bh,
2619 				     void *entry_buf,
2620 				     int buf_size,
2621 				     int csum_size);
2622 extern int ext4_empty_dir(struct inode *inode);
2623 
2624 /* resize.c */
2625 extern int ext4_group_add(struct super_block *sb,
2626 				struct ext4_new_group_data *input);
2627 extern int ext4_group_extend(struct super_block *sb,
2628 				struct ext4_super_block *es,
2629 				ext4_fsblk_t n_blocks_count);
2630 extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count);
2631 
2632 /* super.c */
2633 extern int ext4_seq_options_show(struct seq_file *seq, void *offset);
2634 extern int ext4_calculate_overhead(struct super_block *sb);
2635 extern void ext4_superblock_csum_set(struct super_block *sb);
2636 extern void *ext4_kvmalloc(size_t size, gfp_t flags);
2637 extern void *ext4_kvzalloc(size_t size, gfp_t flags);
2638 extern int ext4_alloc_flex_bg_array(struct super_block *sb,
2639 				    ext4_group_t ngroup);
2640 extern const char *ext4_decode_error(struct super_block *sb, int errno,
2641 				     char nbuf[16]);
2642 
2643 extern __printf(4, 5)
2644 void __ext4_error(struct super_block *, const char *, unsigned int,
2645 		  const char *, ...);
2646 extern __printf(5, 6)
2647 void __ext4_error_inode(struct inode *, const char *, unsigned int, ext4_fsblk_t,
2648 		      const char *, ...);
2649 extern __printf(5, 6)
2650 void __ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t,
2651 		     const char *, ...);
2652 extern void __ext4_std_error(struct super_block *, const char *,
2653 			     unsigned int, int);
2654 extern __printf(4, 5)
2655 void __ext4_abort(struct super_block *, const char *, unsigned int,
2656 		  const char *, ...);
2657 extern __printf(4, 5)
2658 void __ext4_warning(struct super_block *, const char *, unsigned int,
2659 		    const char *, ...);
2660 extern __printf(4, 5)
2661 void __ext4_warning_inode(const struct inode *inode, const char *function,
2662 			  unsigned int line, const char *fmt, ...);
2663 extern __printf(3, 4)
2664 void __ext4_msg(struct super_block *, const char *, const char *, ...);
2665 extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp,
2666 			   const char *, unsigned int, const char *);
2667 extern __printf(7, 8)
2668 void __ext4_grp_locked_error(const char *, unsigned int,
2669 			     struct super_block *, ext4_group_t,
2670 			     unsigned long, ext4_fsblk_t,
2671 			     const char *, ...);
2672 
2673 #define EXT4_ERROR_INODE(inode, fmt, a...) \
2674 	ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a)
2675 
2676 #define EXT4_ERROR_INODE_BLOCK(inode, block, fmt, a...)			\
2677 	ext4_error_inode((inode), __func__, __LINE__, (block), (fmt), ## a)
2678 
2679 #define EXT4_ERROR_FILE(file, block, fmt, a...)				\
2680 	ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a)
2681 
2682 #ifdef CONFIG_PRINTK
2683 
2684 #define ext4_error_inode(inode, func, line, block, fmt, ...)		\
2685 	__ext4_error_inode(inode, func, line, block, fmt, ##__VA_ARGS__)
2686 #define ext4_error_file(file, func, line, block, fmt, ...)		\
2687 	__ext4_error_file(file, func, line, block, fmt, ##__VA_ARGS__)
2688 #define ext4_error(sb, fmt, ...)					\
2689 	__ext4_error(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
2690 #define ext4_abort(sb, fmt, ...)					\
2691 	__ext4_abort(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
2692 #define ext4_warning(sb, fmt, ...)					\
2693 	__ext4_warning(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
2694 #define ext4_warning_inode(inode, fmt, ...)				\
2695 	__ext4_warning_inode(inode, __func__, __LINE__, fmt, ##__VA_ARGS__)
2696 #define ext4_msg(sb, level, fmt, ...)				\
2697 	__ext4_msg(sb, level, fmt, ##__VA_ARGS__)
2698 #define dump_mmp_msg(sb, mmp, msg)					\
2699 	__dump_mmp_msg(sb, mmp, __func__, __LINE__, msg)
2700 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...)		\
2701 	__ext4_grp_locked_error(__func__, __LINE__, sb, grp, ino, block, \
2702 				fmt, ##__VA_ARGS__)
2703 
2704 #else
2705 
2706 #define ext4_error_inode(inode, func, line, block, fmt, ...)		\
2707 do {									\
2708 	no_printk(fmt, ##__VA_ARGS__);					\
2709 	__ext4_error_inode(inode, "", 0, block, " ");			\
2710 } while (0)
2711 #define ext4_error_file(file, func, line, block, fmt, ...)		\
2712 do {									\
2713 	no_printk(fmt, ##__VA_ARGS__);					\
2714 	__ext4_error_file(file, "", 0, block, " ");			\
2715 } while (0)
2716 #define ext4_error(sb, fmt, ...)					\
2717 do {									\
2718 	no_printk(fmt, ##__VA_ARGS__);					\
2719 	__ext4_error(sb, "", 0, " ");					\
2720 } while (0)
2721 #define ext4_abort(sb, fmt, ...)					\
2722 do {									\
2723 	no_printk(fmt, ##__VA_ARGS__);					\
2724 	__ext4_abort(sb, "", 0, " ");					\
2725 } while (0)
2726 #define ext4_warning(sb, fmt, ...)					\
2727 do {									\
2728 	no_printk(fmt, ##__VA_ARGS__);					\
2729 	__ext4_warning(sb, "", 0, " ");					\
2730 } while (0)
2731 #define ext4_warning_inode(inode, fmt, ...)				\
2732 do {									\
2733 	no_printk(fmt, ##__VA_ARGS__);					\
2734 	__ext4_warning_inode(inode, "", 0, " ");			\
2735 } while (0)
2736 #define ext4_msg(sb, level, fmt, ...)					\
2737 do {									\
2738 	no_printk(fmt, ##__VA_ARGS__);					\
2739 	__ext4_msg(sb, "", " ");					\
2740 } while (0)
2741 #define dump_mmp_msg(sb, mmp, msg)					\
2742 	__dump_mmp_msg(sb, mmp, "", 0, "")
2743 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...)		\
2744 do {									\
2745 	no_printk(fmt, ##__VA_ARGS__);				\
2746 	__ext4_grp_locked_error("", 0, sb, grp, ino, block, " ");	\
2747 } while (0)
2748 
2749 #endif
2750 
2751 extern void ext4_update_dynamic_rev(struct super_block *sb);
2752 extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb,
2753 					__u32 compat);
2754 extern int ext4_update_rocompat_feature(handle_t *handle,
2755 					struct super_block *sb,	__u32 rocompat);
2756 extern int ext4_update_incompat_feature(handle_t *handle,
2757 					struct super_block *sb,	__u32 incompat);
2758 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
2759 				      struct ext4_group_desc *bg);
2760 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
2761 				      struct ext4_group_desc *bg);
2762 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
2763 				     struct ext4_group_desc *bg);
2764 extern __u32 ext4_free_group_clusters(struct super_block *sb,
2765 				      struct ext4_group_desc *bg);
2766 extern __u32 ext4_free_inodes_count(struct super_block *sb,
2767 				 struct ext4_group_desc *bg);
2768 extern __u32 ext4_used_dirs_count(struct super_block *sb,
2769 				struct ext4_group_desc *bg);
2770 extern __u32 ext4_itable_unused_count(struct super_block *sb,
2771 				   struct ext4_group_desc *bg);
2772 extern void ext4_block_bitmap_set(struct super_block *sb,
2773 				  struct ext4_group_desc *bg, ext4_fsblk_t blk);
2774 extern void ext4_inode_bitmap_set(struct super_block *sb,
2775 				  struct ext4_group_desc *bg, ext4_fsblk_t blk);
2776 extern void ext4_inode_table_set(struct super_block *sb,
2777 				 struct ext4_group_desc *bg, ext4_fsblk_t blk);
2778 extern void ext4_free_group_clusters_set(struct super_block *sb,
2779 					 struct ext4_group_desc *bg,
2780 					 __u32 count);
2781 extern void ext4_free_inodes_set(struct super_block *sb,
2782 				struct ext4_group_desc *bg, __u32 count);
2783 extern void ext4_used_dirs_set(struct super_block *sb,
2784 				struct ext4_group_desc *bg, __u32 count);
2785 extern void ext4_itable_unused_set(struct super_block *sb,
2786 				   struct ext4_group_desc *bg, __u32 count);
2787 extern int ext4_group_desc_csum_verify(struct super_block *sb, __u32 group,
2788 				       struct ext4_group_desc *gdp);
2789 extern void ext4_group_desc_csum_set(struct super_block *sb, __u32 group,
2790 				     struct ext4_group_desc *gdp);
2791 extern int ext4_register_li_request(struct super_block *sb,
2792 				    ext4_group_t first_not_zeroed);
2793 
2794 static inline int ext4_has_group_desc_csum(struct super_block *sb)
2795 {
2796 	return ext4_has_feature_gdt_csum(sb) ||
2797 	       EXT4_SB(sb)->s_chksum_driver != NULL;
2798 }
2799 
2800 static inline int ext4_has_metadata_csum(struct super_block *sb)
2801 {
2802 	WARN_ON_ONCE(ext4_has_feature_metadata_csum(sb) &&
2803 		     !EXT4_SB(sb)->s_chksum_driver);
2804 
2805 	return (EXT4_SB(sb)->s_chksum_driver != NULL);
2806 }
2807 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
2808 {
2809 	return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) |
2810 		le32_to_cpu(es->s_blocks_count_lo);
2811 }
2812 
2813 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
2814 {
2815 	return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) |
2816 		le32_to_cpu(es->s_r_blocks_count_lo);
2817 }
2818 
2819 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
2820 {
2821 	return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) |
2822 		le32_to_cpu(es->s_free_blocks_count_lo);
2823 }
2824 
2825 static inline void ext4_blocks_count_set(struct ext4_super_block *es,
2826 					 ext4_fsblk_t blk)
2827 {
2828 	es->s_blocks_count_lo = cpu_to_le32((u32)blk);
2829 	es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
2830 }
2831 
2832 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
2833 					      ext4_fsblk_t blk)
2834 {
2835 	es->s_free_blocks_count_lo = cpu_to_le32((u32)blk);
2836 	es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
2837 }
2838 
2839 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
2840 					   ext4_fsblk_t blk)
2841 {
2842 	es->s_r_blocks_count_lo = cpu_to_le32((u32)blk);
2843 	es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
2844 }
2845 
2846 static inline loff_t ext4_isize(struct ext4_inode *raw_inode)
2847 {
2848 	if (S_ISREG(le16_to_cpu(raw_inode->i_mode)))
2849 		return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) |
2850 			le32_to_cpu(raw_inode->i_size_lo);
2851 	else
2852 		return (loff_t) le32_to_cpu(raw_inode->i_size_lo);
2853 }
2854 
2855 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size)
2856 {
2857 	raw_inode->i_size_lo = cpu_to_le32(i_size);
2858 	raw_inode->i_size_high = cpu_to_le32(i_size >> 32);
2859 }
2860 
2861 static inline
2862 struct ext4_group_info *ext4_get_group_info(struct super_block *sb,
2863 					    ext4_group_t group)
2864 {
2865 	 struct ext4_group_info ***grp_info;
2866 	 long indexv, indexh;
2867 	 BUG_ON(group >= EXT4_SB(sb)->s_groups_count);
2868 	 grp_info = EXT4_SB(sb)->s_group_info;
2869 	 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb));
2870 	 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1);
2871 	 return grp_info[indexv][indexh];
2872 }
2873 
2874 /*
2875  * Reading s_groups_count requires using smp_rmb() afterwards.  See
2876  * the locking protocol documented in the comments of ext4_group_add()
2877  * in resize.c
2878  */
2879 static inline ext4_group_t ext4_get_groups_count(struct super_block *sb)
2880 {
2881 	ext4_group_t	ngroups = EXT4_SB(sb)->s_groups_count;
2882 
2883 	smp_rmb();
2884 	return ngroups;
2885 }
2886 
2887 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi,
2888 					     ext4_group_t block_group)
2889 {
2890 	return block_group >> sbi->s_log_groups_per_flex;
2891 }
2892 
2893 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi)
2894 {
2895 	return 1 << sbi->s_log_groups_per_flex;
2896 }
2897 
2898 #define ext4_std_error(sb, errno)				\
2899 do {								\
2900 	if ((errno))						\
2901 		__ext4_std_error((sb), __func__, __LINE__, (errno));	\
2902 } while (0)
2903 
2904 #ifdef CONFIG_SMP
2905 /* Each CPU can accumulate percpu_counter_batch clusters in their local
2906  * counters. So we need to make sure we have free clusters more
2907  * than percpu_counter_batch  * nr_cpu_ids. Also add a window of 4 times.
2908  */
2909 #define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids))
2910 #else
2911 #define EXT4_FREECLUSTERS_WATERMARK 0
2912 #endif
2913 
2914 /* Update i_disksize. Requires i_mutex to avoid races with truncate */
2915 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize)
2916 {
2917 	WARN_ON_ONCE(S_ISREG(inode->i_mode) &&
2918 		     !inode_is_locked(inode));
2919 	down_write(&EXT4_I(inode)->i_data_sem);
2920 	if (newsize > EXT4_I(inode)->i_disksize)
2921 		EXT4_I(inode)->i_disksize = newsize;
2922 	up_write(&EXT4_I(inode)->i_data_sem);
2923 }
2924 
2925 /* Update i_size, i_disksize. Requires i_mutex to avoid races with truncate */
2926 static inline int ext4_update_inode_size(struct inode *inode, loff_t newsize)
2927 {
2928 	int changed = 0;
2929 
2930 	if (newsize > inode->i_size) {
2931 		i_size_write(inode, newsize);
2932 		changed = 1;
2933 	}
2934 	if (newsize > EXT4_I(inode)->i_disksize) {
2935 		ext4_update_i_disksize(inode, newsize);
2936 		changed |= 2;
2937 	}
2938 	return changed;
2939 }
2940 
2941 int ext4_update_disksize_before_punch(struct inode *inode, loff_t offset,
2942 				      loff_t len);
2943 
2944 struct ext4_group_info {
2945 	unsigned long   bb_state;
2946 	struct rb_root  bb_free_root;
2947 	ext4_grpblk_t	bb_first_free;	/* first free block */
2948 	ext4_grpblk_t	bb_free;	/* total free blocks */
2949 	ext4_grpblk_t	bb_fragments;	/* nr of freespace fragments */
2950 	ext4_grpblk_t	bb_largest_free_order;/* order of largest frag in BG */
2951 	struct          list_head bb_prealloc_list;
2952 #ifdef DOUBLE_CHECK
2953 	void            *bb_bitmap;
2954 #endif
2955 	struct rw_semaphore alloc_sem;
2956 	ext4_grpblk_t	bb_counters[];	/* Nr of free power-of-two-block
2957 					 * regions, index is order.
2958 					 * bb_counters[3] = 5 means
2959 					 * 5 free 8-block regions. */
2960 };
2961 
2962 #define EXT4_GROUP_INFO_NEED_INIT_BIT		0
2963 #define EXT4_GROUP_INFO_WAS_TRIMMED_BIT		1
2964 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT	2
2965 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT	3
2966 
2967 #define EXT4_MB_GRP_NEED_INIT(grp)	\
2968 	(test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state)))
2969 #define EXT4_MB_GRP_BBITMAP_CORRUPT(grp)	\
2970 	(test_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &((grp)->bb_state)))
2971 #define EXT4_MB_GRP_IBITMAP_CORRUPT(grp)	\
2972 	(test_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &((grp)->bb_state)))
2973 
2974 #define EXT4_MB_GRP_WAS_TRIMMED(grp)	\
2975 	(test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2976 #define EXT4_MB_GRP_SET_TRIMMED(grp)	\
2977 	(set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2978 #define EXT4_MB_GRP_CLEAR_TRIMMED(grp)	\
2979 	(clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2980 
2981 #define EXT4_MAX_CONTENTION		8
2982 #define EXT4_CONTENTION_THRESHOLD	2
2983 
2984 static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb,
2985 					      ext4_group_t group)
2986 {
2987 	return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group);
2988 }
2989 
2990 /*
2991  * Returns true if the filesystem is busy enough that attempts to
2992  * access the block group locks has run into contention.
2993  */
2994 static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi)
2995 {
2996 	return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD);
2997 }
2998 
2999 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group)
3000 {
3001 	spinlock_t *lock = ext4_group_lock_ptr(sb, group);
3002 	if (spin_trylock(lock))
3003 		/*
3004 		 * We're able to grab the lock right away, so drop the
3005 		 * lock contention counter.
3006 		 */
3007 		atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0);
3008 	else {
3009 		/*
3010 		 * The lock is busy, so bump the contention counter,
3011 		 * and then wait on the spin lock.
3012 		 */
3013 		atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1,
3014 				  EXT4_MAX_CONTENTION);
3015 		spin_lock(lock);
3016 	}
3017 }
3018 
3019 static inline void ext4_unlock_group(struct super_block *sb,
3020 					ext4_group_t group)
3021 {
3022 	spin_unlock(ext4_group_lock_ptr(sb, group));
3023 }
3024 
3025 /*
3026  * Block validity checking
3027  */
3028 #define ext4_check_indirect_blockref(inode, bh)				\
3029 	ext4_check_blockref(__func__, __LINE__, inode,			\
3030 			    (__le32 *)(bh)->b_data,			\
3031 			    EXT4_ADDR_PER_BLOCK((inode)->i_sb))
3032 
3033 #define ext4_ind_check_inode(inode)					\
3034 	ext4_check_blockref(__func__, __LINE__, inode,			\
3035 			    EXT4_I(inode)->i_data,			\
3036 			    EXT4_NDIR_BLOCKS)
3037 
3038 /*
3039  * Inodes and files operations
3040  */
3041 
3042 /* dir.c */
3043 extern const struct file_operations ext4_dir_operations;
3044 
3045 /* file.c */
3046 extern const struct inode_operations ext4_file_inode_operations;
3047 extern const struct file_operations ext4_file_operations;
3048 extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin);
3049 
3050 /* inline.c */
3051 extern int ext4_get_max_inline_size(struct inode *inode);
3052 extern int ext4_find_inline_data_nolock(struct inode *inode);
3053 extern int ext4_init_inline_data(handle_t *handle, struct inode *inode,
3054 				 unsigned int len);
3055 extern int ext4_destroy_inline_data(handle_t *handle, struct inode *inode);
3056 
3057 extern int ext4_readpage_inline(struct inode *inode, struct page *page);
3058 extern int ext4_try_to_write_inline_data(struct address_space *mapping,
3059 					 struct inode *inode,
3060 					 loff_t pos, unsigned len,
3061 					 unsigned flags,
3062 					 struct page **pagep);
3063 extern int ext4_write_inline_data_end(struct inode *inode,
3064 				      loff_t pos, unsigned len,
3065 				      unsigned copied,
3066 				      struct page *page);
3067 extern struct buffer_head *
3068 ext4_journalled_write_inline_data(struct inode *inode,
3069 				  unsigned len,
3070 				  struct page *page);
3071 extern int ext4_da_write_inline_data_begin(struct address_space *mapping,
3072 					   struct inode *inode,
3073 					   loff_t pos, unsigned len,
3074 					   unsigned flags,
3075 					   struct page **pagep,
3076 					   void **fsdata);
3077 extern int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos,
3078 					 unsigned len, unsigned copied,
3079 					 struct page *page);
3080 extern int ext4_try_add_inline_entry(handle_t *handle,
3081 				     struct ext4_filename *fname,
3082 				     struct inode *dir, struct inode *inode);
3083 extern int ext4_try_create_inline_dir(handle_t *handle,
3084 				      struct inode *parent,
3085 				      struct inode *inode);
3086 extern int ext4_read_inline_dir(struct file *filp,
3087 				struct dir_context *ctx,
3088 				int *has_inline_data);
3089 extern int htree_inlinedir_to_tree(struct file *dir_file,
3090 				   struct inode *dir, ext4_lblk_t block,
3091 				   struct dx_hash_info *hinfo,
3092 				   __u32 start_hash, __u32 start_minor_hash,
3093 				   int *has_inline_data);
3094 extern struct buffer_head *ext4_find_inline_entry(struct inode *dir,
3095 					struct ext4_filename *fname,
3096 					const struct qstr *d_name,
3097 					struct ext4_dir_entry_2 **res_dir,
3098 					int *has_inline_data);
3099 extern int ext4_delete_inline_entry(handle_t *handle,
3100 				    struct inode *dir,
3101 				    struct ext4_dir_entry_2 *de_del,
3102 				    struct buffer_head *bh,
3103 				    int *has_inline_data);
3104 extern int empty_inline_dir(struct inode *dir, int *has_inline_data);
3105 extern struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
3106 					struct ext4_dir_entry_2 **parent_de,
3107 					int *retval);
3108 extern int ext4_inline_data_fiemap(struct inode *inode,
3109 				   struct fiemap_extent_info *fieinfo,
3110 				   int *has_inline, __u64 start, __u64 len);
3111 extern int ext4_try_to_evict_inline_data(handle_t *handle,
3112 					 struct inode *inode,
3113 					 int needed);
3114 extern void ext4_inline_data_truncate(struct inode *inode, int *has_inline);
3115 
3116 extern int ext4_convert_inline_data(struct inode *inode);
3117 
3118 static inline int ext4_has_inline_data(struct inode *inode)
3119 {
3120 	return ext4_test_inode_flag(inode, EXT4_INODE_INLINE_DATA) &&
3121 	       EXT4_I(inode)->i_inline_off;
3122 }
3123 
3124 /* namei.c */
3125 extern const struct inode_operations ext4_dir_inode_operations;
3126 extern const struct inode_operations ext4_special_inode_operations;
3127 extern struct dentry *ext4_get_parent(struct dentry *child);
3128 extern struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode,
3129 				 struct ext4_dir_entry_2 *de,
3130 				 int blocksize, int csum_size,
3131 				 unsigned int parent_ino, int dotdot_real_len);
3132 extern void initialize_dirent_tail(struct ext4_dir_entry_tail *t,
3133 				   unsigned int blocksize);
3134 extern int ext4_handle_dirty_dirent_node(handle_t *handle,
3135 					 struct inode *inode,
3136 					 struct buffer_head *bh);
3137 #define S_SHIFT 12
3138 static unsigned char ext4_type_by_mode[S_IFMT >> S_SHIFT] = {
3139 	[S_IFREG >> S_SHIFT]	= EXT4_FT_REG_FILE,
3140 	[S_IFDIR >> S_SHIFT]	= EXT4_FT_DIR,
3141 	[S_IFCHR >> S_SHIFT]	= EXT4_FT_CHRDEV,
3142 	[S_IFBLK >> S_SHIFT]	= EXT4_FT_BLKDEV,
3143 	[S_IFIFO >> S_SHIFT]	= EXT4_FT_FIFO,
3144 	[S_IFSOCK >> S_SHIFT]	= EXT4_FT_SOCK,
3145 	[S_IFLNK >> S_SHIFT]	= EXT4_FT_SYMLINK,
3146 };
3147 
3148 static inline void ext4_set_de_type(struct super_block *sb,
3149 				struct ext4_dir_entry_2 *de,
3150 				umode_t mode) {
3151 	if (ext4_has_feature_filetype(sb))
3152 		de->file_type = ext4_type_by_mode[(mode & S_IFMT)>>S_SHIFT];
3153 }
3154 
3155 /* readpages.c */
3156 extern int ext4_mpage_readpages(struct address_space *mapping,
3157 				struct list_head *pages, struct page *page,
3158 				unsigned nr_pages);
3159 
3160 /* symlink.c */
3161 extern const struct inode_operations ext4_encrypted_symlink_inode_operations;
3162 extern const struct inode_operations ext4_symlink_inode_operations;
3163 extern const struct inode_operations ext4_fast_symlink_inode_operations;
3164 
3165 /* sysfs.c */
3166 extern int ext4_register_sysfs(struct super_block *sb);
3167 extern void ext4_unregister_sysfs(struct super_block *sb);
3168 extern int __init ext4_init_sysfs(void);
3169 extern void ext4_exit_sysfs(void);
3170 
3171 /* block_validity */
3172 extern void ext4_release_system_zone(struct super_block *sb);
3173 extern int ext4_setup_system_zone(struct super_block *sb);
3174 extern int __init ext4_init_system_zone(void);
3175 extern void ext4_exit_system_zone(void);
3176 extern int ext4_data_block_valid(struct ext4_sb_info *sbi,
3177 				 ext4_fsblk_t start_blk,
3178 				 unsigned int count);
3179 extern int ext4_check_blockref(const char *, unsigned int,
3180 			       struct inode *, __le32 *, unsigned int);
3181 
3182 /* extents.c */
3183 struct ext4_ext_path;
3184 struct ext4_extent;
3185 
3186 /*
3187  * Maximum number of logical blocks in a file; ext4_extent's ee_block is
3188  * __le32.
3189  */
3190 #define EXT_MAX_BLOCKS	0xffffffff
3191 
3192 extern int ext4_ext_tree_init(handle_t *handle, struct inode *);
3193 extern int ext4_ext_writepage_trans_blocks(struct inode *, int);
3194 extern int ext4_ext_index_trans_blocks(struct inode *inode, int extents);
3195 extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
3196 			       struct ext4_map_blocks *map, int flags);
3197 extern void ext4_ext_truncate(handle_t *, struct inode *);
3198 extern int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start,
3199 				 ext4_lblk_t end);
3200 extern void ext4_ext_init(struct super_block *);
3201 extern void ext4_ext_release(struct super_block *);
3202 extern long ext4_fallocate(struct file *file, int mode, loff_t offset,
3203 			  loff_t len);
3204 extern int ext4_convert_unwritten_extents(handle_t *handle, struct inode *inode,
3205 					  loff_t offset, ssize_t len);
3206 extern int ext4_map_blocks(handle_t *handle, struct inode *inode,
3207 			   struct ext4_map_blocks *map, int flags);
3208 extern int ext4_ext_calc_metadata_amount(struct inode *inode,
3209 					 ext4_lblk_t lblocks);
3210 extern int ext4_ext_calc_credits_for_single_extent(struct inode *inode,
3211 						   int num,
3212 						   struct ext4_ext_path *path);
3213 extern int ext4_can_extents_be_merged(struct inode *inode,
3214 				      struct ext4_extent *ex1,
3215 				      struct ext4_extent *ex2);
3216 extern int ext4_ext_insert_extent(handle_t *, struct inode *,
3217 				  struct ext4_ext_path **,
3218 				  struct ext4_extent *, int);
3219 extern struct ext4_ext_path *ext4_find_extent(struct inode *, ext4_lblk_t,
3220 					      struct ext4_ext_path **,
3221 					      int flags);
3222 extern void ext4_ext_drop_refs(struct ext4_ext_path *);
3223 extern int ext4_ext_check_inode(struct inode *inode);
3224 extern int ext4_find_delalloc_range(struct inode *inode,
3225 				    ext4_lblk_t lblk_start,
3226 				    ext4_lblk_t lblk_end);
3227 extern int ext4_find_delalloc_cluster(struct inode *inode, ext4_lblk_t lblk);
3228 extern ext4_lblk_t ext4_ext_next_allocated_block(struct ext4_ext_path *path);
3229 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
3230 			__u64 start, __u64 len);
3231 extern int ext4_ext_precache(struct inode *inode);
3232 extern int ext4_collapse_range(struct inode *inode, loff_t offset, loff_t len);
3233 extern int ext4_insert_range(struct inode *inode, loff_t offset, loff_t len);
3234 extern int ext4_swap_extents(handle_t *handle, struct inode *inode1,
3235 				struct inode *inode2, ext4_lblk_t lblk1,
3236 			     ext4_lblk_t lblk2,  ext4_lblk_t count,
3237 			     int mark_unwritten,int *err);
3238 
3239 /* move_extent.c */
3240 extern void ext4_double_down_write_data_sem(struct inode *first,
3241 					    struct inode *second);
3242 extern void ext4_double_up_write_data_sem(struct inode *orig_inode,
3243 					  struct inode *donor_inode);
3244 extern int ext4_move_extents(struct file *o_filp, struct file *d_filp,
3245 			     __u64 start_orig, __u64 start_donor,
3246 			     __u64 len, __u64 *moved_len);
3247 
3248 /* page-io.c */
3249 extern int __init ext4_init_pageio(void);
3250 extern void ext4_exit_pageio(void);
3251 extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags);
3252 extern ext4_io_end_t *ext4_get_io_end(ext4_io_end_t *io_end);
3253 extern int ext4_put_io_end(ext4_io_end_t *io_end);
3254 extern void ext4_put_io_end_defer(ext4_io_end_t *io_end);
3255 extern void ext4_io_submit_init(struct ext4_io_submit *io,
3256 				struct writeback_control *wbc);
3257 extern void ext4_end_io_rsv_work(struct work_struct *work);
3258 extern void ext4_io_submit(struct ext4_io_submit *io);
3259 extern int ext4_bio_write_page(struct ext4_io_submit *io,
3260 			       struct page *page,
3261 			       int len,
3262 			       struct writeback_control *wbc,
3263 			       bool keep_towrite);
3264 
3265 /* mmp.c */
3266 extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t);
3267 
3268 /*
3269  * Add new method to test whether block and inode bitmaps are properly
3270  * initialized. With uninit_bg reading the block from disk is not enough
3271  * to mark the bitmap uptodate. We need to also zero-out the bitmap
3272  */
3273 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart
3274 
3275 static inline int bitmap_uptodate(struct buffer_head *bh)
3276 {
3277 	return (buffer_uptodate(bh) &&
3278 			test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state));
3279 }
3280 static inline void set_bitmap_uptodate(struct buffer_head *bh)
3281 {
3282 	set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state);
3283 }
3284 
3285 /*
3286  * Disable DIO read nolock optimization, so new dioreaders will be forced
3287  * to grab i_mutex
3288  */
3289 static inline void ext4_inode_block_unlocked_dio(struct inode *inode)
3290 {
3291 	ext4_set_inode_state(inode, EXT4_STATE_DIOREAD_LOCK);
3292 	smp_mb();
3293 }
3294 static inline void ext4_inode_resume_unlocked_dio(struct inode *inode)
3295 {
3296 	smp_mb();
3297 	ext4_clear_inode_state(inode, EXT4_STATE_DIOREAD_LOCK);
3298 }
3299 
3300 #define in_range(b, first, len)	((b) >= (first) && (b) <= (first) + (len) - 1)
3301 
3302 /* For ioend & aio unwritten conversion wait queues */
3303 #define EXT4_WQ_HASH_SZ		37
3304 #define ext4_ioend_wq(v)   (&ext4__ioend_wq[((unsigned long)(v)) %\
3305 					    EXT4_WQ_HASH_SZ])
3306 extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
3307 
3308 #define EXT4_RESIZING	0
3309 extern int ext4_resize_begin(struct super_block *sb);
3310 extern void ext4_resize_end(struct super_block *sb);
3311 
3312 static inline void ext4_set_io_unwritten_flag(struct inode *inode,
3313 					      struct ext4_io_end *io_end)
3314 {
3315 	if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) {
3316 		io_end->flag |= EXT4_IO_END_UNWRITTEN;
3317 		atomic_inc(&EXT4_I(inode)->i_unwritten);
3318 	}
3319 }
3320 
3321 static inline void ext4_clear_io_unwritten_flag(ext4_io_end_t *io_end)
3322 {
3323 	struct inode *inode = io_end->inode;
3324 
3325 	if (io_end->flag & EXT4_IO_END_UNWRITTEN) {
3326 		io_end->flag &= ~EXT4_IO_END_UNWRITTEN;
3327 		/* Wake up anyone waiting on unwritten extent conversion */
3328 		if (atomic_dec_and_test(&EXT4_I(inode)->i_unwritten))
3329 			wake_up_all(ext4_ioend_wq(inode));
3330 	}
3331 }
3332 
3333 #endif	/* __KERNEL__ */
3334 
3335 #define EFSBADCRC	EBADMSG		/* Bad CRC detected */
3336 #define EFSCORRUPTED	EUCLEAN		/* Filesystem is corrupted */
3337 
3338 #endif	/* _EXT4_H */
3339