xref: /openbmc/linux/fs/ext4/ext4.h (revision 6f52b16c5b29b89d92c0e7236f4655dc8491ad70)
1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3  *  ext4.h
4  *
5  * Copyright (C) 1992, 1993, 1994, 1995
6  * Remy Card (card@masi.ibp.fr)
7  * Laboratoire MASI - Institut Blaise Pascal
8  * Universite Pierre et Marie Curie (Paris VI)
9  *
10  *  from
11  *
12  *  linux/include/linux/minix_fs.h
13  *
14  *  Copyright (C) 1991, 1992  Linus Torvalds
15  */
16 
17 #ifndef _EXT4_H
18 #define _EXT4_H
19 
20 #include <linux/types.h>
21 #include <linux/blkdev.h>
22 #include <linux/magic.h>
23 #include <linux/jbd2.h>
24 #include <linux/quota.h>
25 #include <linux/rwsem.h>
26 #include <linux/rbtree.h>
27 #include <linux/seqlock.h>
28 #include <linux/mutex.h>
29 #include <linux/timer.h>
30 #include <linux/version.h>
31 #include <linux/wait.h>
32 #include <linux/sched/signal.h>
33 #include <linux/blockgroup_lock.h>
34 #include <linux/percpu_counter.h>
35 #include <linux/ratelimit.h>
36 #include <crypto/hash.h>
37 #ifdef CONFIG_EXT4_FS_ENCRYPTION
38 #include <linux/fscrypt_supp.h>
39 #else
40 #include <linux/fscrypt_notsupp.h>
41 #endif
42 #include <linux/falloc.h>
43 #include <linux/percpu-rwsem.h>
44 #ifdef __KERNEL__
45 #include <linux/compat.h>
46 #endif
47 
48 /*
49  * The fourth extended filesystem constants/structures
50  */
51 
52 /*
53  * with AGGRESSIVE_CHECK allocator runs consistency checks over
54  * structures. these checks slow things down a lot
55  */
56 #define AGGRESSIVE_CHECK__
57 
58 /*
59  * with DOUBLE_CHECK defined mballoc creates persistent in-core
60  * bitmaps, maintains and uses them to check for double allocations
61  */
62 #define DOUBLE_CHECK__
63 
64 /*
65  * Define EXT4FS_DEBUG to produce debug messages
66  */
67 #undef EXT4FS_DEBUG
68 
69 /*
70  * Debug code
71  */
72 #ifdef EXT4FS_DEBUG
73 #define ext4_debug(f, a...)						\
74 	do {								\
75 		printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:",	\
76 			__FILE__, __LINE__, __func__);			\
77 		printk(KERN_DEBUG f, ## a);				\
78 	} while (0)
79 #else
80 #define ext4_debug(fmt, ...)	no_printk(fmt, ##__VA_ARGS__)
81 #endif
82 
83 /*
84  * Turn on EXT_DEBUG to get lots of info about extents operations.
85  */
86 #define EXT_DEBUG__
87 #ifdef EXT_DEBUG
88 #define ext_debug(fmt, ...)	printk(fmt, ##__VA_ARGS__)
89 #else
90 #define ext_debug(fmt, ...)	no_printk(fmt, ##__VA_ARGS__)
91 #endif
92 
93 /* data type for block offset of block group */
94 typedef int ext4_grpblk_t;
95 
96 /* data type for filesystem-wide blocks number */
97 typedef unsigned long long ext4_fsblk_t;
98 
99 /* data type for file logical block number */
100 typedef __u32 ext4_lblk_t;
101 
102 /* data type for block group number */
103 typedef unsigned int ext4_group_t;
104 
105 enum SHIFT_DIRECTION {
106 	SHIFT_LEFT = 0,
107 	SHIFT_RIGHT,
108 };
109 
110 /*
111  * Flags used in mballoc's allocation_context flags field.
112  *
113  * Also used to show what's going on for debugging purposes when the
114  * flag field is exported via the traceport interface
115  */
116 
117 /* prefer goal again. length */
118 #define EXT4_MB_HINT_MERGE		0x0001
119 /* blocks already reserved */
120 #define EXT4_MB_HINT_RESERVED		0x0002
121 /* metadata is being allocated */
122 #define EXT4_MB_HINT_METADATA		0x0004
123 /* first blocks in the file */
124 #define EXT4_MB_HINT_FIRST		0x0008
125 /* search for the best chunk */
126 #define EXT4_MB_HINT_BEST		0x0010
127 /* data is being allocated */
128 #define EXT4_MB_HINT_DATA		0x0020
129 /* don't preallocate (for tails) */
130 #define EXT4_MB_HINT_NOPREALLOC		0x0040
131 /* allocate for locality group */
132 #define EXT4_MB_HINT_GROUP_ALLOC	0x0080
133 /* allocate goal blocks or none */
134 #define EXT4_MB_HINT_GOAL_ONLY		0x0100
135 /* goal is meaningful */
136 #define EXT4_MB_HINT_TRY_GOAL		0x0200
137 /* blocks already pre-reserved by delayed allocation */
138 #define EXT4_MB_DELALLOC_RESERVED	0x0400
139 /* We are doing stream allocation */
140 #define EXT4_MB_STREAM_ALLOC		0x0800
141 /* Use reserved root blocks if needed */
142 #define EXT4_MB_USE_ROOT_BLOCKS		0x1000
143 /* Use blocks from reserved pool */
144 #define EXT4_MB_USE_RESERVED		0x2000
145 
146 struct ext4_allocation_request {
147 	/* target inode for block we're allocating */
148 	struct inode *inode;
149 	/* how many blocks we want to allocate */
150 	unsigned int len;
151 	/* logical block in target inode */
152 	ext4_lblk_t logical;
153 	/* the closest logical allocated block to the left */
154 	ext4_lblk_t lleft;
155 	/* the closest logical allocated block to the right */
156 	ext4_lblk_t lright;
157 	/* phys. target (a hint) */
158 	ext4_fsblk_t goal;
159 	/* phys. block for the closest logical allocated block to the left */
160 	ext4_fsblk_t pleft;
161 	/* phys. block for the closest logical allocated block to the right */
162 	ext4_fsblk_t pright;
163 	/* flags. see above EXT4_MB_HINT_* */
164 	unsigned int flags;
165 };
166 
167 /*
168  * Logical to physical block mapping, used by ext4_map_blocks()
169  *
170  * This structure is used to pass requests into ext4_map_blocks() as
171  * well as to store the information returned by ext4_map_blocks().  It
172  * takes less room on the stack than a struct buffer_head.
173  */
174 #define EXT4_MAP_NEW		(1 << BH_New)
175 #define EXT4_MAP_MAPPED		(1 << BH_Mapped)
176 #define EXT4_MAP_UNWRITTEN	(1 << BH_Unwritten)
177 #define EXT4_MAP_BOUNDARY	(1 << BH_Boundary)
178 #define EXT4_MAP_FLAGS		(EXT4_MAP_NEW | EXT4_MAP_MAPPED |\
179 				 EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY)
180 
181 struct ext4_map_blocks {
182 	ext4_fsblk_t m_pblk;
183 	ext4_lblk_t m_lblk;
184 	unsigned int m_len;
185 	unsigned int m_flags;
186 };
187 
188 /*
189  * Flags for ext4_io_end->flags
190  */
191 #define	EXT4_IO_END_UNWRITTEN	0x0001
192 
193 /*
194  * For converting unwritten extents on a work queue. 'handle' is used for
195  * buffered writeback.
196  */
197 typedef struct ext4_io_end {
198 	struct list_head	list;		/* per-file finished IO list */
199 	handle_t		*handle;	/* handle reserved for extent
200 						 * conversion */
201 	struct inode		*inode;		/* file being written to */
202 	struct bio		*bio;		/* Linked list of completed
203 						 * bios covering the extent */
204 	unsigned int		flag;		/* unwritten or not */
205 	atomic_t		count;		/* reference counter */
206 	loff_t			offset;		/* offset in the file */
207 	ssize_t			size;		/* size of the extent */
208 } ext4_io_end_t;
209 
210 struct ext4_io_submit {
211 	struct writeback_control *io_wbc;
212 	struct bio		*io_bio;
213 	ext4_io_end_t		*io_end;
214 	sector_t		io_next_block;
215 };
216 
217 /*
218  * Special inodes numbers
219  */
220 #define	EXT4_BAD_INO		 1	/* Bad blocks inode */
221 #define EXT4_ROOT_INO		 2	/* Root inode */
222 #define EXT4_USR_QUOTA_INO	 3	/* User quota inode */
223 #define EXT4_GRP_QUOTA_INO	 4	/* Group quota inode */
224 #define EXT4_BOOT_LOADER_INO	 5	/* Boot loader inode */
225 #define EXT4_UNDEL_DIR_INO	 6	/* Undelete directory inode */
226 #define EXT4_RESIZE_INO		 7	/* Reserved group descriptors inode */
227 #define EXT4_JOURNAL_INO	 8	/* Journal inode */
228 
229 /* First non-reserved inode for old ext4 filesystems */
230 #define EXT4_GOOD_OLD_FIRST_INO	11
231 
232 /*
233  * Maximal count of links to a file
234  */
235 #define EXT4_LINK_MAX		65000
236 
237 /*
238  * Macro-instructions used to manage several block sizes
239  */
240 #define EXT4_MIN_BLOCK_SIZE		1024
241 #define	EXT4_MAX_BLOCK_SIZE		65536
242 #define EXT4_MIN_BLOCK_LOG_SIZE		10
243 #define EXT4_MAX_BLOCK_LOG_SIZE		16
244 #define EXT4_MAX_CLUSTER_LOG_SIZE	30
245 #ifdef __KERNEL__
246 # define EXT4_BLOCK_SIZE(s)		((s)->s_blocksize)
247 #else
248 # define EXT4_BLOCK_SIZE(s)		(EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
249 #endif
250 #define	EXT4_ADDR_PER_BLOCK(s)		(EXT4_BLOCK_SIZE(s) / sizeof(__u32))
251 #define EXT4_CLUSTER_SIZE(s)		(EXT4_BLOCK_SIZE(s) << \
252 					 EXT4_SB(s)->s_cluster_bits)
253 #ifdef __KERNEL__
254 # define EXT4_BLOCK_SIZE_BITS(s)	((s)->s_blocksize_bits)
255 # define EXT4_CLUSTER_BITS(s)		(EXT4_SB(s)->s_cluster_bits)
256 #else
257 # define EXT4_BLOCK_SIZE_BITS(s)	((s)->s_log_block_size + 10)
258 #endif
259 #ifdef __KERNEL__
260 #define	EXT4_ADDR_PER_BLOCK_BITS(s)	(EXT4_SB(s)->s_addr_per_block_bits)
261 #define EXT4_INODE_SIZE(s)		(EXT4_SB(s)->s_inode_size)
262 #define EXT4_FIRST_INO(s)		(EXT4_SB(s)->s_first_ino)
263 #else
264 #define EXT4_INODE_SIZE(s)	(((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
265 				 EXT4_GOOD_OLD_INODE_SIZE : \
266 				 (s)->s_inode_size)
267 #define EXT4_FIRST_INO(s)	(((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
268 				 EXT4_GOOD_OLD_FIRST_INO : \
269 				 (s)->s_first_ino)
270 #endif
271 #define EXT4_BLOCK_ALIGN(size, blkbits)		ALIGN((size), (1 << (blkbits)))
272 #define EXT4_MAX_BLOCKS(size, offset, blkbits) \
273 	((EXT4_BLOCK_ALIGN(size + offset, blkbits) >> blkbits) - (offset >> \
274 								  blkbits))
275 
276 /* Translate a block number to a cluster number */
277 #define EXT4_B2C(sbi, blk)	((blk) >> (sbi)->s_cluster_bits)
278 /* Translate a cluster number to a block number */
279 #define EXT4_C2B(sbi, cluster)	((cluster) << (sbi)->s_cluster_bits)
280 /* Translate # of blks to # of clusters */
281 #define EXT4_NUM_B2C(sbi, blks)	(((blks) + (sbi)->s_cluster_ratio - 1) >> \
282 				 (sbi)->s_cluster_bits)
283 /* Mask out the low bits to get the starting block of the cluster */
284 #define EXT4_PBLK_CMASK(s, pblk) ((pblk) &				\
285 				  ~((ext4_fsblk_t) (s)->s_cluster_ratio - 1))
286 #define EXT4_LBLK_CMASK(s, lblk) ((lblk) &				\
287 				  ~((ext4_lblk_t) (s)->s_cluster_ratio - 1))
288 /* Get the cluster offset */
289 #define EXT4_PBLK_COFF(s, pblk) ((pblk) &				\
290 				 ((ext4_fsblk_t) (s)->s_cluster_ratio - 1))
291 #define EXT4_LBLK_COFF(s, lblk) ((lblk) &				\
292 				 ((ext4_lblk_t) (s)->s_cluster_ratio - 1))
293 
294 /*
295  * Structure of a blocks group descriptor
296  */
297 struct ext4_group_desc
298 {
299 	__le32	bg_block_bitmap_lo;	/* Blocks bitmap block */
300 	__le32	bg_inode_bitmap_lo;	/* Inodes bitmap block */
301 	__le32	bg_inode_table_lo;	/* Inodes table block */
302 	__le16	bg_free_blocks_count_lo;/* Free blocks count */
303 	__le16	bg_free_inodes_count_lo;/* Free inodes count */
304 	__le16	bg_used_dirs_count_lo;	/* Directories count */
305 	__le16	bg_flags;		/* EXT4_BG_flags (INODE_UNINIT, etc) */
306 	__le32  bg_exclude_bitmap_lo;   /* Exclude bitmap for snapshots */
307 	__le16  bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bbitmap) LE */
308 	__le16  bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+ibitmap) LE */
309 	__le16  bg_itable_unused_lo;	/* Unused inodes count */
310 	__le16  bg_checksum;		/* crc16(sb_uuid+group+desc) */
311 	__le32	bg_block_bitmap_hi;	/* Blocks bitmap block MSB */
312 	__le32	bg_inode_bitmap_hi;	/* Inodes bitmap block MSB */
313 	__le32	bg_inode_table_hi;	/* Inodes table block MSB */
314 	__le16	bg_free_blocks_count_hi;/* Free blocks count MSB */
315 	__le16	bg_free_inodes_count_hi;/* Free inodes count MSB */
316 	__le16	bg_used_dirs_count_hi;	/* Directories count MSB */
317 	__le16  bg_itable_unused_hi;    /* Unused inodes count MSB */
318 	__le32  bg_exclude_bitmap_hi;   /* Exclude bitmap block MSB */
319 	__le16  bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bbitmap) BE */
320 	__le16  bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+ibitmap) BE */
321 	__u32   bg_reserved;
322 };
323 
324 #define EXT4_BG_INODE_BITMAP_CSUM_HI_END	\
325 	(offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \
326 	 sizeof(__le16))
327 #define EXT4_BG_BLOCK_BITMAP_CSUM_HI_END	\
328 	(offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \
329 	 sizeof(__le16))
330 
331 /*
332  * Structure of a flex block group info
333  */
334 
335 struct flex_groups {
336 	atomic64_t	free_clusters;
337 	atomic_t	free_inodes;
338 	atomic_t	used_dirs;
339 };
340 
341 #define EXT4_BG_INODE_UNINIT	0x0001 /* Inode table/bitmap not in use */
342 #define EXT4_BG_BLOCK_UNINIT	0x0002 /* Block bitmap not in use */
343 #define EXT4_BG_INODE_ZEROED	0x0004 /* On-disk itable initialized to zero */
344 
345 /*
346  * Macro-instructions used to manage group descriptors
347  */
348 #define EXT4_MIN_DESC_SIZE		32
349 #define EXT4_MIN_DESC_SIZE_64BIT	64
350 #define	EXT4_MAX_DESC_SIZE		EXT4_MIN_BLOCK_SIZE
351 #define EXT4_DESC_SIZE(s)		(EXT4_SB(s)->s_desc_size)
352 #ifdef __KERNEL__
353 # define EXT4_BLOCKS_PER_GROUP(s)	(EXT4_SB(s)->s_blocks_per_group)
354 # define EXT4_CLUSTERS_PER_GROUP(s)	(EXT4_SB(s)->s_clusters_per_group)
355 # define EXT4_DESC_PER_BLOCK(s)		(EXT4_SB(s)->s_desc_per_block)
356 # define EXT4_INODES_PER_GROUP(s)	(EXT4_SB(s)->s_inodes_per_group)
357 # define EXT4_DESC_PER_BLOCK_BITS(s)	(EXT4_SB(s)->s_desc_per_block_bits)
358 #else
359 # define EXT4_BLOCKS_PER_GROUP(s)	((s)->s_blocks_per_group)
360 # define EXT4_DESC_PER_BLOCK(s)		(EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
361 # define EXT4_INODES_PER_GROUP(s)	((s)->s_inodes_per_group)
362 #endif
363 
364 /*
365  * Constants relative to the data blocks
366  */
367 #define	EXT4_NDIR_BLOCKS		12
368 #define	EXT4_IND_BLOCK			EXT4_NDIR_BLOCKS
369 #define	EXT4_DIND_BLOCK			(EXT4_IND_BLOCK + 1)
370 #define	EXT4_TIND_BLOCK			(EXT4_DIND_BLOCK + 1)
371 #define	EXT4_N_BLOCKS			(EXT4_TIND_BLOCK + 1)
372 
373 /*
374  * Inode flags
375  */
376 #define	EXT4_SECRM_FL			0x00000001 /* Secure deletion */
377 #define	EXT4_UNRM_FL			0x00000002 /* Undelete */
378 #define	EXT4_COMPR_FL			0x00000004 /* Compress file */
379 #define EXT4_SYNC_FL			0x00000008 /* Synchronous updates */
380 #define EXT4_IMMUTABLE_FL		0x00000010 /* Immutable file */
381 #define EXT4_APPEND_FL			0x00000020 /* writes to file may only append */
382 #define EXT4_NODUMP_FL			0x00000040 /* do not dump file */
383 #define EXT4_NOATIME_FL			0x00000080 /* do not update atime */
384 /* Reserved for compression usage... */
385 #define EXT4_DIRTY_FL			0x00000100
386 #define EXT4_COMPRBLK_FL		0x00000200 /* One or more compressed clusters */
387 #define EXT4_NOCOMPR_FL			0x00000400 /* Don't compress */
388 	/* nb: was previously EXT2_ECOMPR_FL */
389 #define EXT4_ENCRYPT_FL			0x00000800 /* encrypted file */
390 /* End compression flags --- maybe not all used */
391 #define EXT4_INDEX_FL			0x00001000 /* hash-indexed directory */
392 #define EXT4_IMAGIC_FL			0x00002000 /* AFS directory */
393 #define EXT4_JOURNAL_DATA_FL		0x00004000 /* file data should be journaled */
394 #define EXT4_NOTAIL_FL			0x00008000 /* file tail should not be merged */
395 #define EXT4_DIRSYNC_FL			0x00010000 /* dirsync behaviour (directories only) */
396 #define EXT4_TOPDIR_FL			0x00020000 /* Top of directory hierarchies*/
397 #define EXT4_HUGE_FILE_FL               0x00040000 /* Set to each huge file */
398 #define EXT4_EXTENTS_FL			0x00080000 /* Inode uses extents */
399 #define EXT4_EA_INODE_FL	        0x00200000 /* Inode used for large EA */
400 #define EXT4_EOFBLOCKS_FL		0x00400000 /* Blocks allocated beyond EOF */
401 #define EXT4_INLINE_DATA_FL		0x10000000 /* Inode has inline data. */
402 #define EXT4_PROJINHERIT_FL		0x20000000 /* Create with parents projid */
403 #define EXT4_RESERVED_FL		0x80000000 /* reserved for ext4 lib */
404 
405 #define EXT4_FL_USER_VISIBLE		0x304BDFFF /* User visible flags */
406 #define EXT4_FL_USER_MODIFIABLE		0x204BC0FF /* User modifiable flags */
407 
408 /* Flags we can manipulate with through EXT4_IOC_FSSETXATTR */
409 #define EXT4_FL_XFLAG_VISIBLE		(EXT4_SYNC_FL | \
410 					 EXT4_IMMUTABLE_FL | \
411 					 EXT4_APPEND_FL | \
412 					 EXT4_NODUMP_FL | \
413 					 EXT4_NOATIME_FL | \
414 					 EXT4_PROJINHERIT_FL)
415 
416 /* Flags that should be inherited by new inodes from their parent. */
417 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\
418 			   EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\
419 			   EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\
420 			   EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL |\
421 			   EXT4_PROJINHERIT_FL)
422 
423 /* Flags that are appropriate for regular files (all but dir-specific ones). */
424 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL))
425 
426 /* Flags that are appropriate for non-directories/regular files. */
427 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL)
428 
429 /* Mask out flags that are inappropriate for the given type of inode. */
430 static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags)
431 {
432 	if (S_ISDIR(mode))
433 		return flags;
434 	else if (S_ISREG(mode))
435 		return flags & EXT4_REG_FLMASK;
436 	else
437 		return flags & EXT4_OTHER_FLMASK;
438 }
439 
440 /*
441  * Inode flags used for atomic set/get
442  */
443 enum {
444 	EXT4_INODE_SECRM	= 0,	/* Secure deletion */
445 	EXT4_INODE_UNRM		= 1,	/* Undelete */
446 	EXT4_INODE_COMPR	= 2,	/* Compress file */
447 	EXT4_INODE_SYNC		= 3,	/* Synchronous updates */
448 	EXT4_INODE_IMMUTABLE	= 4,	/* Immutable file */
449 	EXT4_INODE_APPEND	= 5,	/* writes to file may only append */
450 	EXT4_INODE_NODUMP	= 6,	/* do not dump file */
451 	EXT4_INODE_NOATIME	= 7,	/* do not update atime */
452 /* Reserved for compression usage... */
453 	EXT4_INODE_DIRTY	= 8,
454 	EXT4_INODE_COMPRBLK	= 9,	/* One or more compressed clusters */
455 	EXT4_INODE_NOCOMPR	= 10,	/* Don't compress */
456 	EXT4_INODE_ENCRYPT	= 11,	/* Encrypted file */
457 /* End compression flags --- maybe not all used */
458 	EXT4_INODE_INDEX	= 12,	/* hash-indexed directory */
459 	EXT4_INODE_IMAGIC	= 13,	/* AFS directory */
460 	EXT4_INODE_JOURNAL_DATA	= 14,	/* file data should be journaled */
461 	EXT4_INODE_NOTAIL	= 15,	/* file tail should not be merged */
462 	EXT4_INODE_DIRSYNC	= 16,	/* dirsync behaviour (directories only) */
463 	EXT4_INODE_TOPDIR	= 17,	/* Top of directory hierarchies*/
464 	EXT4_INODE_HUGE_FILE	= 18,	/* Set to each huge file */
465 	EXT4_INODE_EXTENTS	= 19,	/* Inode uses extents */
466 	EXT4_INODE_EA_INODE	= 21,	/* Inode used for large EA */
467 	EXT4_INODE_EOFBLOCKS	= 22,	/* Blocks allocated beyond EOF */
468 	EXT4_INODE_INLINE_DATA	= 28,	/* Data in inode. */
469 	EXT4_INODE_PROJINHERIT	= 29,	/* Create with parents projid */
470 	EXT4_INODE_RESERVED	= 31,	/* reserved for ext4 lib */
471 };
472 
473 /*
474  * Since it's pretty easy to mix up bit numbers and hex values, we use a
475  * build-time check to make sure that EXT4_XXX_FL is consistent with respect to
476  * EXT4_INODE_XXX. If all is well, the macros will be dropped, so, it won't cost
477  * any extra space in the compiled kernel image, otherwise, the build will fail.
478  * It's important that these values are the same, since we are using
479  * EXT4_INODE_XXX to test for flag values, but EXT4_XXX_FL must be consistent
480  * with the values of FS_XXX_FL defined in include/linux/fs.h and the on-disk
481  * values found in ext2, ext3 and ext4 filesystems, and of course the values
482  * defined in e2fsprogs.
483  *
484  * It's not paranoia if the Murphy's Law really *is* out to get you.  :-)
485  */
486 #define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG))
487 #define CHECK_FLAG_VALUE(FLAG) BUILD_BUG_ON(!TEST_FLAG_VALUE(FLAG))
488 
489 static inline void ext4_check_flag_values(void)
490 {
491 	CHECK_FLAG_VALUE(SECRM);
492 	CHECK_FLAG_VALUE(UNRM);
493 	CHECK_FLAG_VALUE(COMPR);
494 	CHECK_FLAG_VALUE(SYNC);
495 	CHECK_FLAG_VALUE(IMMUTABLE);
496 	CHECK_FLAG_VALUE(APPEND);
497 	CHECK_FLAG_VALUE(NODUMP);
498 	CHECK_FLAG_VALUE(NOATIME);
499 	CHECK_FLAG_VALUE(DIRTY);
500 	CHECK_FLAG_VALUE(COMPRBLK);
501 	CHECK_FLAG_VALUE(NOCOMPR);
502 	CHECK_FLAG_VALUE(ENCRYPT);
503 	CHECK_FLAG_VALUE(INDEX);
504 	CHECK_FLAG_VALUE(IMAGIC);
505 	CHECK_FLAG_VALUE(JOURNAL_DATA);
506 	CHECK_FLAG_VALUE(NOTAIL);
507 	CHECK_FLAG_VALUE(DIRSYNC);
508 	CHECK_FLAG_VALUE(TOPDIR);
509 	CHECK_FLAG_VALUE(HUGE_FILE);
510 	CHECK_FLAG_VALUE(EXTENTS);
511 	CHECK_FLAG_VALUE(EA_INODE);
512 	CHECK_FLAG_VALUE(EOFBLOCKS);
513 	CHECK_FLAG_VALUE(INLINE_DATA);
514 	CHECK_FLAG_VALUE(PROJINHERIT);
515 	CHECK_FLAG_VALUE(RESERVED);
516 }
517 
518 /* Used to pass group descriptor data when online resize is done */
519 struct ext4_new_group_input {
520 	__u32 group;		/* Group number for this data */
521 	__u64 block_bitmap;	/* Absolute block number of block bitmap */
522 	__u64 inode_bitmap;	/* Absolute block number of inode bitmap */
523 	__u64 inode_table;	/* Absolute block number of inode table start */
524 	__u32 blocks_count;	/* Total number of blocks in this group */
525 	__u16 reserved_blocks;	/* Number of reserved blocks in this group */
526 	__u16 unused;
527 };
528 
529 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
530 struct compat_ext4_new_group_input {
531 	u32 group;
532 	compat_u64 block_bitmap;
533 	compat_u64 inode_bitmap;
534 	compat_u64 inode_table;
535 	u32 blocks_count;
536 	u16 reserved_blocks;
537 	u16 unused;
538 };
539 #endif
540 
541 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */
542 struct ext4_new_group_data {
543 	__u32 group;
544 	__u64 block_bitmap;
545 	__u64 inode_bitmap;
546 	__u64 inode_table;
547 	__u32 blocks_count;
548 	__u16 reserved_blocks;
549 	__u16 unused;
550 	__u32 free_blocks_count;
551 };
552 
553 /* Indexes used to index group tables in ext4_new_group_data */
554 enum {
555 	BLOCK_BITMAP = 0,	/* block bitmap */
556 	INODE_BITMAP,		/* inode bitmap */
557 	INODE_TABLE,		/* inode tables */
558 	GROUP_TABLE_COUNT,
559 };
560 
561 /*
562  * Flags used by ext4_map_blocks()
563  */
564 	/* Allocate any needed blocks and/or convert an unwritten
565 	   extent to be an initialized ext4 */
566 #define EXT4_GET_BLOCKS_CREATE			0x0001
567 	/* Request the creation of an unwritten extent */
568 #define EXT4_GET_BLOCKS_UNWRIT_EXT		0x0002
569 #define EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT	(EXT4_GET_BLOCKS_UNWRIT_EXT|\
570 						 EXT4_GET_BLOCKS_CREATE)
571 	/* Caller is from the delayed allocation writeout path
572 	 * finally doing the actual allocation of delayed blocks */
573 #define EXT4_GET_BLOCKS_DELALLOC_RESERVE	0x0004
574 	/* caller is from the direct IO path, request to creation of an
575 	unwritten extents if not allocated, split the unwritten
576 	extent if blocks has been preallocated already*/
577 #define EXT4_GET_BLOCKS_PRE_IO			0x0008
578 #define EXT4_GET_BLOCKS_CONVERT			0x0010
579 #define EXT4_GET_BLOCKS_IO_CREATE_EXT		(EXT4_GET_BLOCKS_PRE_IO|\
580 					 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT)
581 	/* Convert extent to initialized after IO complete */
582 #define EXT4_GET_BLOCKS_IO_CONVERT_EXT		(EXT4_GET_BLOCKS_CONVERT|\
583 					 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT)
584 	/* Eventual metadata allocation (due to growing extent tree)
585 	 * should not fail, so try to use reserved blocks for that.*/
586 #define EXT4_GET_BLOCKS_METADATA_NOFAIL		0x0020
587 	/* Don't normalize allocation size (used for fallocate) */
588 #define EXT4_GET_BLOCKS_NO_NORMALIZE		0x0040
589 	/* Request will not result in inode size update (user for fallocate) */
590 #define EXT4_GET_BLOCKS_KEEP_SIZE		0x0080
591 	/* Convert written extents to unwritten */
592 #define EXT4_GET_BLOCKS_CONVERT_UNWRITTEN	0x0100
593 	/* Write zeros to newly created written extents */
594 #define EXT4_GET_BLOCKS_ZERO			0x0200
595 #define EXT4_GET_BLOCKS_CREATE_ZERO		(EXT4_GET_BLOCKS_CREATE |\
596 					EXT4_GET_BLOCKS_ZERO)
597 	/* Caller will submit data before dropping transaction handle. This
598 	 * allows jbd2 to avoid submitting data before commit. */
599 #define EXT4_GET_BLOCKS_IO_SUBMIT		0x0400
600 
601 /*
602  * The bit position of these flags must not overlap with any of the
603  * EXT4_GET_BLOCKS_*.  They are used by ext4_find_extent(),
604  * read_extent_tree_block(), ext4_split_extent_at(),
605  * ext4_ext_insert_extent(), and ext4_ext_create_new_leaf().
606  * EXT4_EX_NOCACHE is used to indicate that the we shouldn't be
607  * caching the extents when reading from the extent tree while a
608  * truncate or punch hole operation is in progress.
609  */
610 #define EXT4_EX_NOCACHE				0x40000000
611 #define EXT4_EX_FORCE_CACHE			0x20000000
612 
613 /*
614  * Flags used by ext4_free_blocks
615  */
616 #define EXT4_FREE_BLOCKS_METADATA	0x0001
617 #define EXT4_FREE_BLOCKS_FORGET		0x0002
618 #define EXT4_FREE_BLOCKS_VALIDATED	0x0004
619 #define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE	0x0008
620 #define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER	0x0010
621 #define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER	0x0020
622 
623 /*
624  * ioctl commands
625  */
626 #define	EXT4_IOC_GETFLAGS		FS_IOC_GETFLAGS
627 #define	EXT4_IOC_SETFLAGS		FS_IOC_SETFLAGS
628 #define	EXT4_IOC_GETVERSION		_IOR('f', 3, long)
629 #define	EXT4_IOC_SETVERSION		_IOW('f', 4, long)
630 #define	EXT4_IOC_GETVERSION_OLD		FS_IOC_GETVERSION
631 #define	EXT4_IOC_SETVERSION_OLD		FS_IOC_SETVERSION
632 #define EXT4_IOC_GETRSVSZ		_IOR('f', 5, long)
633 #define EXT4_IOC_SETRSVSZ		_IOW('f', 6, long)
634 #define EXT4_IOC_GROUP_EXTEND		_IOW('f', 7, unsigned long)
635 #define EXT4_IOC_GROUP_ADD		_IOW('f', 8, struct ext4_new_group_input)
636 #define EXT4_IOC_MIGRATE		_IO('f', 9)
637  /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */
638  /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */
639 #define EXT4_IOC_ALLOC_DA_BLKS		_IO('f', 12)
640 #define EXT4_IOC_MOVE_EXT		_IOWR('f', 15, struct move_extent)
641 #define EXT4_IOC_RESIZE_FS		_IOW('f', 16, __u64)
642 #define EXT4_IOC_SWAP_BOOT		_IO('f', 17)
643 #define EXT4_IOC_PRECACHE_EXTENTS	_IO('f', 18)
644 #define EXT4_IOC_SET_ENCRYPTION_POLICY	FS_IOC_SET_ENCRYPTION_POLICY
645 #define EXT4_IOC_GET_ENCRYPTION_PWSALT	FS_IOC_GET_ENCRYPTION_PWSALT
646 #define EXT4_IOC_GET_ENCRYPTION_POLICY	FS_IOC_GET_ENCRYPTION_POLICY
647 
648 #ifndef FS_IOC_FSGETXATTR
649 /* Until the uapi changes get merged for project quota... */
650 
651 #define FS_IOC_FSGETXATTR		_IOR('X', 31, struct fsxattr)
652 #define FS_IOC_FSSETXATTR		_IOW('X', 32, struct fsxattr)
653 
654 /*
655  * Structure for FS_IOC_FSGETXATTR and FS_IOC_FSSETXATTR.
656  */
657 struct fsxattr {
658 	__u32		fsx_xflags;	/* xflags field value (get/set) */
659 	__u32		fsx_extsize;	/* extsize field value (get/set)*/
660 	__u32		fsx_nextents;	/* nextents field value (get)	*/
661 	__u32		fsx_projid;	/* project identifier (get/set) */
662 	unsigned char	fsx_pad[12];
663 };
664 
665 /*
666  * Flags for the fsx_xflags field
667  */
668 #define FS_XFLAG_REALTIME	0x00000001	/* data in realtime volume */
669 #define FS_XFLAG_PREALLOC	0x00000002	/* preallocated file extents */
670 #define FS_XFLAG_IMMUTABLE	0x00000008	/* file cannot be modified */
671 #define FS_XFLAG_APPEND		0x00000010	/* all writes append */
672 #define FS_XFLAG_SYNC		0x00000020	/* all writes synchronous */
673 #define FS_XFLAG_NOATIME	0x00000040	/* do not update access time */
674 #define FS_XFLAG_NODUMP		0x00000080	/* do not include in backups */
675 #define FS_XFLAG_RTINHERIT	0x00000100	/* create with rt bit set */
676 #define FS_XFLAG_PROJINHERIT	0x00000200	/* create with parents projid */
677 #define FS_XFLAG_NOSYMLINKS	0x00000400	/* disallow symlink creation */
678 #define FS_XFLAG_EXTSIZE	0x00000800	/* extent size allocator hint */
679 #define FS_XFLAG_EXTSZINHERIT	0x00001000	/* inherit inode extent size */
680 #define FS_XFLAG_NODEFRAG	0x00002000  	/* do not defragment */
681 #define FS_XFLAG_FILESTREAM	0x00004000	/* use filestream allocator */
682 #define FS_XFLAG_HASATTR	0x80000000	/* no DIFLAG for this */
683 #endif /* !defined(FS_IOC_FSGETXATTR) */
684 
685 #define EXT4_IOC_FSGETXATTR		FS_IOC_FSGETXATTR
686 #define EXT4_IOC_FSSETXATTR		FS_IOC_FSSETXATTR
687 
688 #define EXT4_IOC_SHUTDOWN _IOR ('X', 125, __u32)
689 
690 /*
691  * Flags for going down operation
692  */
693 #define EXT4_GOING_FLAGS_DEFAULT		0x0	/* going down */
694 #define EXT4_GOING_FLAGS_LOGFLUSH		0x1	/* flush log but not data */
695 #define EXT4_GOING_FLAGS_NOLOGFLUSH		0x2	/* don't flush log nor data */
696 
697 
698 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
699 /*
700  * ioctl commands in 32 bit emulation
701  */
702 #define EXT4_IOC32_GETFLAGS		FS_IOC32_GETFLAGS
703 #define EXT4_IOC32_SETFLAGS		FS_IOC32_SETFLAGS
704 #define EXT4_IOC32_GETVERSION		_IOR('f', 3, int)
705 #define EXT4_IOC32_SETVERSION		_IOW('f', 4, int)
706 #define EXT4_IOC32_GETRSVSZ		_IOR('f', 5, int)
707 #define EXT4_IOC32_SETRSVSZ		_IOW('f', 6, int)
708 #define EXT4_IOC32_GROUP_EXTEND		_IOW('f', 7, unsigned int)
709 #define EXT4_IOC32_GROUP_ADD		_IOW('f', 8, struct compat_ext4_new_group_input)
710 #define EXT4_IOC32_GETVERSION_OLD	FS_IOC32_GETVERSION
711 #define EXT4_IOC32_SETVERSION_OLD	FS_IOC32_SETVERSION
712 #endif
713 
714 /* Max physical block we can address w/o extents */
715 #define EXT4_MAX_BLOCK_FILE_PHYS	0xFFFFFFFF
716 
717 /*
718  * Structure of an inode on the disk
719  */
720 struct ext4_inode {
721 	__le16	i_mode;		/* File mode */
722 	__le16	i_uid;		/* Low 16 bits of Owner Uid */
723 	__le32	i_size_lo;	/* Size in bytes */
724 	__le32	i_atime;	/* Access time */
725 	__le32	i_ctime;	/* Inode Change time */
726 	__le32	i_mtime;	/* Modification time */
727 	__le32	i_dtime;	/* Deletion Time */
728 	__le16	i_gid;		/* Low 16 bits of Group Id */
729 	__le16	i_links_count;	/* Links count */
730 	__le32	i_blocks_lo;	/* Blocks count */
731 	__le32	i_flags;	/* File flags */
732 	union {
733 		struct {
734 			__le32  l_i_version;
735 		} linux1;
736 		struct {
737 			__u32  h_i_translator;
738 		} hurd1;
739 		struct {
740 			__u32  m_i_reserved1;
741 		} masix1;
742 	} osd1;				/* OS dependent 1 */
743 	__le32	i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
744 	__le32	i_generation;	/* File version (for NFS) */
745 	__le32	i_file_acl_lo;	/* File ACL */
746 	__le32	i_size_high;
747 	__le32	i_obso_faddr;	/* Obsoleted fragment address */
748 	union {
749 		struct {
750 			__le16	l_i_blocks_high; /* were l_i_reserved1 */
751 			__le16	l_i_file_acl_high;
752 			__le16	l_i_uid_high;	/* these 2 fields */
753 			__le16	l_i_gid_high;	/* were reserved2[0] */
754 			__le16	l_i_checksum_lo;/* crc32c(uuid+inum+inode) LE */
755 			__le16	l_i_reserved;
756 		} linux2;
757 		struct {
758 			__le16	h_i_reserved1;	/* Obsoleted fragment number/size which are removed in ext4 */
759 			__u16	h_i_mode_high;
760 			__u16	h_i_uid_high;
761 			__u16	h_i_gid_high;
762 			__u32	h_i_author;
763 		} hurd2;
764 		struct {
765 			__le16	h_i_reserved1;	/* Obsoleted fragment number/size which are removed in ext4 */
766 			__le16	m_i_file_acl_high;
767 			__u32	m_i_reserved2[2];
768 		} masix2;
769 	} osd2;				/* OS dependent 2 */
770 	__le16	i_extra_isize;
771 	__le16	i_checksum_hi;	/* crc32c(uuid+inum+inode) BE */
772 	__le32  i_ctime_extra;  /* extra Change time      (nsec << 2 | epoch) */
773 	__le32  i_mtime_extra;  /* extra Modification time(nsec << 2 | epoch) */
774 	__le32  i_atime_extra;  /* extra Access time      (nsec << 2 | epoch) */
775 	__le32  i_crtime;       /* File Creation time */
776 	__le32  i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */
777 	__le32  i_version_hi;	/* high 32 bits for 64-bit version */
778 	__le32	i_projid;	/* Project ID */
779 };
780 
781 struct move_extent {
782 	__u32 reserved;		/* should be zero */
783 	__u32 donor_fd;		/* donor file descriptor */
784 	__u64 orig_start;	/* logical start offset in block for orig */
785 	__u64 donor_start;	/* logical start offset in block for donor */
786 	__u64 len;		/* block length to be moved */
787 	__u64 moved_len;	/* moved block length */
788 };
789 
790 #define EXT4_EPOCH_BITS 2
791 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
792 #define EXT4_NSEC_MASK  (~0UL << EXT4_EPOCH_BITS)
793 
794 /*
795  * Extended fields will fit into an inode if the filesystem was formatted
796  * with large inodes (-I 256 or larger) and there are not currently any EAs
797  * consuming all of the available space. For new inodes we always reserve
798  * enough space for the kernel's known extended fields, but for inodes
799  * created with an old kernel this might not have been the case. None of
800  * the extended inode fields is critical for correct filesystem operation.
801  * This macro checks if a certain field fits in the inode. Note that
802  * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
803  */
804 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field)	\
805 	((offsetof(typeof(*ext4_inode), field) +	\
806 	  sizeof((ext4_inode)->field))			\
807 	<= (EXT4_GOOD_OLD_INODE_SIZE +			\
808 	    (einode)->i_extra_isize))			\
809 
810 /*
811  * We use an encoding that preserves the times for extra epoch "00":
812  *
813  * extra  msb of                         adjust for signed
814  * epoch  32-bit                         32-bit tv_sec to
815  * bits   time    decoded 64-bit tv_sec  64-bit tv_sec      valid time range
816  * 0 0    1    -0x80000000..-0x00000001  0x000000000 1901-12-13..1969-12-31
817  * 0 0    0    0x000000000..0x07fffffff  0x000000000 1970-01-01..2038-01-19
818  * 0 1    1    0x080000000..0x0ffffffff  0x100000000 2038-01-19..2106-02-07
819  * 0 1    0    0x100000000..0x17fffffff  0x100000000 2106-02-07..2174-02-25
820  * 1 0    1    0x180000000..0x1ffffffff  0x200000000 2174-02-25..2242-03-16
821  * 1 0    0    0x200000000..0x27fffffff  0x200000000 2242-03-16..2310-04-04
822  * 1 1    1    0x280000000..0x2ffffffff  0x300000000 2310-04-04..2378-04-22
823  * 1 1    0    0x300000000..0x37fffffff  0x300000000 2378-04-22..2446-05-10
824  *
825  * Note that previous versions of the kernel on 64-bit systems would
826  * incorrectly use extra epoch bits 1,1 for dates between 1901 and
827  * 1970.  e2fsck will correct this, assuming that it is run on the
828  * affected filesystem before 2242.
829  */
830 
831 static inline __le32 ext4_encode_extra_time(struct timespec *time)
832 {
833 	u32 extra = sizeof(time->tv_sec) > 4 ?
834 		((time->tv_sec - (s32)time->tv_sec) >> 32) & EXT4_EPOCH_MASK : 0;
835 	return cpu_to_le32(extra | (time->tv_nsec << EXT4_EPOCH_BITS));
836 }
837 
838 static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra)
839 {
840 	if (unlikely(sizeof(time->tv_sec) > 4 &&
841 			(extra & cpu_to_le32(EXT4_EPOCH_MASK)))) {
842 
843 #if 1
844 		/* Handle legacy encoding of pre-1970 dates with epoch
845 		 * bits 1,1. (This backwards compatibility may be removed
846 		 * at the discretion of the ext4 developers.)
847 		 */
848 		u64 extra_bits = le32_to_cpu(extra) & EXT4_EPOCH_MASK;
849 		if (extra_bits == 3 && ((time->tv_sec) & 0x80000000) != 0)
850 			extra_bits = 0;
851 		time->tv_sec += extra_bits << 32;
852 #else
853 		time->tv_sec += (u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) << 32;
854 #endif
855 	}
856 	time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS;
857 }
858 
859 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode)			       \
860 do {									       \
861 	(raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec);	       \
862 	if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra))     \
863 		(raw_inode)->xtime ## _extra =				       \
864 				ext4_encode_extra_time(&(inode)->xtime);       \
865 } while (0)
866 
867 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode)			       \
868 do {									       \
869 	if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime))		       \
870 		(raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec);      \
871 	if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra))	       \
872 		(raw_inode)->xtime ## _extra =				       \
873 				ext4_encode_extra_time(&(einode)->xtime);      \
874 } while (0)
875 
876 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode)			       \
877 do {									       \
878 	(inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime);       \
879 	if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra))     \
880 		ext4_decode_extra_time(&(inode)->xtime,			       \
881 				       raw_inode->xtime ## _extra);	       \
882 	else								       \
883 		(inode)->xtime.tv_nsec = 0;				       \
884 } while (0)
885 
886 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode)			       \
887 do {									       \
888 	if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime))		       \
889 		(einode)->xtime.tv_sec = 				       \
890 			(signed)le32_to_cpu((raw_inode)->xtime);	       \
891 	else								       \
892 		(einode)->xtime.tv_sec = 0;				       \
893 	if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra))	       \
894 		ext4_decode_extra_time(&(einode)->xtime,		       \
895 				       raw_inode->xtime ## _extra);	       \
896 	else								       \
897 		(einode)->xtime.tv_nsec = 0;				       \
898 } while (0)
899 
900 #define i_disk_version osd1.linux1.l_i_version
901 
902 #if defined(__KERNEL__) || defined(__linux__)
903 #define i_reserved1	osd1.linux1.l_i_reserved1
904 #define i_file_acl_high	osd2.linux2.l_i_file_acl_high
905 #define i_blocks_high	osd2.linux2.l_i_blocks_high
906 #define i_uid_low	i_uid
907 #define i_gid_low	i_gid
908 #define i_uid_high	osd2.linux2.l_i_uid_high
909 #define i_gid_high	osd2.linux2.l_i_gid_high
910 #define i_checksum_lo	osd2.linux2.l_i_checksum_lo
911 
912 #elif defined(__GNU__)
913 
914 #define i_translator	osd1.hurd1.h_i_translator
915 #define i_uid_high	osd2.hurd2.h_i_uid_high
916 #define i_gid_high	osd2.hurd2.h_i_gid_high
917 #define i_author	osd2.hurd2.h_i_author
918 
919 #elif defined(__masix__)
920 
921 #define i_reserved1	osd1.masix1.m_i_reserved1
922 #define i_file_acl_high	osd2.masix2.m_i_file_acl_high
923 #define i_reserved2	osd2.masix2.m_i_reserved2
924 
925 #endif /* defined(__KERNEL__) || defined(__linux__) */
926 
927 #include "extents_status.h"
928 
929 /*
930  * Lock subclasses for i_data_sem in the ext4_inode_info structure.
931  *
932  * These are needed to avoid lockdep false positives when we need to
933  * allocate blocks to the quota inode during ext4_map_blocks(), while
934  * holding i_data_sem for a normal (non-quota) inode.  Since we don't
935  * do quota tracking for the quota inode, this avoids deadlock (as
936  * well as infinite recursion, since it isn't turtles all the way
937  * down...)
938  *
939  *  I_DATA_SEM_NORMAL - Used for most inodes
940  *  I_DATA_SEM_OTHER  - Used by move_inode.c for the second normal inode
941  *			  where the second inode has larger inode number
942  *			  than the first
943  *  I_DATA_SEM_QUOTA  - Used for quota inodes only
944  */
945 enum {
946 	I_DATA_SEM_NORMAL = 0,
947 	I_DATA_SEM_OTHER,
948 	I_DATA_SEM_QUOTA,
949 };
950 
951 
952 /*
953  * fourth extended file system inode data in memory
954  */
955 struct ext4_inode_info {
956 	__le32	i_data[15];	/* unconverted */
957 	__u32	i_dtime;
958 	ext4_fsblk_t	i_file_acl;
959 
960 	/*
961 	 * i_block_group is the number of the block group which contains
962 	 * this file's inode.  Constant across the lifetime of the inode,
963 	 * it is used for making block allocation decisions - we try to
964 	 * place a file's data blocks near its inode block, and new inodes
965 	 * near to their parent directory's inode.
966 	 */
967 	ext4_group_t	i_block_group;
968 	ext4_lblk_t	i_dir_start_lookup;
969 #if (BITS_PER_LONG < 64)
970 	unsigned long	i_state_flags;		/* Dynamic state flags */
971 #endif
972 	unsigned long	i_flags;
973 
974 	/*
975 	 * Extended attributes can be read independently of the main file
976 	 * data. Taking i_mutex even when reading would cause contention
977 	 * between readers of EAs and writers of regular file data, so
978 	 * instead we synchronize on xattr_sem when reading or changing
979 	 * EAs.
980 	 */
981 	struct rw_semaphore xattr_sem;
982 
983 	struct list_head i_orphan;	/* unlinked but open inodes */
984 
985 	/*
986 	 * i_disksize keeps track of what the inode size is ON DISK, not
987 	 * in memory.  During truncate, i_size is set to the new size by
988 	 * the VFS prior to calling ext4_truncate(), but the filesystem won't
989 	 * set i_disksize to 0 until the truncate is actually under way.
990 	 *
991 	 * The intent is that i_disksize always represents the blocks which
992 	 * are used by this file.  This allows recovery to restart truncate
993 	 * on orphans if we crash during truncate.  We actually write i_disksize
994 	 * into the on-disk inode when writing inodes out, instead of i_size.
995 	 *
996 	 * The only time when i_disksize and i_size may be different is when
997 	 * a truncate is in progress.  The only things which change i_disksize
998 	 * are ext4_get_block (growth) and ext4_truncate (shrinkth).
999 	 */
1000 	loff_t	i_disksize;
1001 
1002 	/*
1003 	 * i_data_sem is for serialising ext4_truncate() against
1004 	 * ext4_getblock().  In the 2.4 ext2 design, great chunks of inode's
1005 	 * data tree are chopped off during truncate. We can't do that in
1006 	 * ext4 because whenever we perform intermediate commits during
1007 	 * truncate, the inode and all the metadata blocks *must* be in a
1008 	 * consistent state which allows truncation of the orphans to restart
1009 	 * during recovery.  Hence we must fix the get_block-vs-truncate race
1010 	 * by other means, so we have i_data_sem.
1011 	 */
1012 	struct rw_semaphore i_data_sem;
1013 	/*
1014 	 * i_mmap_sem is for serializing page faults with truncate / punch hole
1015 	 * operations. We have to make sure that new page cannot be faulted in
1016 	 * a section of the inode that is being punched. We cannot easily use
1017 	 * i_data_sem for this since we need protection for the whole punch
1018 	 * operation and i_data_sem ranks below transaction start so we have
1019 	 * to occasionally drop it.
1020 	 */
1021 	struct rw_semaphore i_mmap_sem;
1022 	struct inode vfs_inode;
1023 	struct jbd2_inode *jinode;
1024 
1025 	spinlock_t i_raw_lock;	/* protects updates to the raw inode */
1026 
1027 	/*
1028 	 * File creation time. Its function is same as that of
1029 	 * struct timespec i_{a,c,m}time in the generic inode.
1030 	 */
1031 	struct timespec i_crtime;
1032 
1033 	/* mballoc */
1034 	struct list_head i_prealloc_list;
1035 	spinlock_t i_prealloc_lock;
1036 
1037 	/* extents status tree */
1038 	struct ext4_es_tree i_es_tree;
1039 	rwlock_t i_es_lock;
1040 	struct list_head i_es_list;
1041 	unsigned int i_es_all_nr;	/* protected by i_es_lock */
1042 	unsigned int i_es_shk_nr;	/* protected by i_es_lock */
1043 	ext4_lblk_t i_es_shrink_lblk;	/* Offset where we start searching for
1044 					   extents to shrink. Protected by
1045 					   i_es_lock  */
1046 
1047 	/* ialloc */
1048 	ext4_group_t	i_last_alloc_group;
1049 
1050 	/* allocation reservation info for delalloc */
1051 	/* In case of bigalloc, this refer to clusters rather than blocks */
1052 	unsigned int i_reserved_data_blocks;
1053 	ext4_lblk_t i_da_metadata_calc_last_lblock;
1054 	int i_da_metadata_calc_len;
1055 
1056 	/* on-disk additional length */
1057 	__u16 i_extra_isize;
1058 
1059 	/* Indicate the inline data space. */
1060 	u16 i_inline_off;
1061 	u16 i_inline_size;
1062 
1063 #ifdef CONFIG_QUOTA
1064 	/* quota space reservation, managed internally by quota code */
1065 	qsize_t i_reserved_quota;
1066 #endif
1067 
1068 	/* Lock protecting lists below */
1069 	spinlock_t i_completed_io_lock;
1070 	/*
1071 	 * Completed IOs that need unwritten extents handling and have
1072 	 * transaction reserved
1073 	 */
1074 	struct list_head i_rsv_conversion_list;
1075 	struct work_struct i_rsv_conversion_work;
1076 	atomic_t i_unwritten; /* Nr. of inflight conversions pending */
1077 
1078 	spinlock_t i_block_reservation_lock;
1079 
1080 	/*
1081 	 * Transactions that contain inode's metadata needed to complete
1082 	 * fsync and fdatasync, respectively.
1083 	 */
1084 	tid_t i_sync_tid;
1085 	tid_t i_datasync_tid;
1086 
1087 #ifdef CONFIG_QUOTA
1088 	struct dquot *i_dquot[MAXQUOTAS];
1089 #endif
1090 
1091 	/* Precomputed uuid+inum+igen checksum for seeding inode checksums */
1092 	__u32 i_csum_seed;
1093 
1094 	kprojid_t i_projid;
1095 };
1096 
1097 /*
1098  * File system states
1099  */
1100 #define	EXT4_VALID_FS			0x0001	/* Unmounted cleanly */
1101 #define	EXT4_ERROR_FS			0x0002	/* Errors detected */
1102 #define	EXT4_ORPHAN_FS			0x0004	/* Orphans being recovered */
1103 
1104 /*
1105  * Misc. filesystem flags
1106  */
1107 #define EXT2_FLAGS_SIGNED_HASH		0x0001  /* Signed dirhash in use */
1108 #define EXT2_FLAGS_UNSIGNED_HASH	0x0002  /* Unsigned dirhash in use */
1109 #define EXT2_FLAGS_TEST_FILESYS		0x0004	/* to test development code */
1110 
1111 /*
1112  * Mount flags set via mount options or defaults
1113  */
1114 #define EXT4_MOUNT_NO_MBCACHE		0x00001 /* Do not use mbcache */
1115 #define EXT4_MOUNT_GRPID		0x00004	/* Create files with directory's group */
1116 #define EXT4_MOUNT_DEBUG		0x00008	/* Some debugging messages */
1117 #define EXT4_MOUNT_ERRORS_CONT		0x00010	/* Continue on errors */
1118 #define EXT4_MOUNT_ERRORS_RO		0x00020	/* Remount fs ro on errors */
1119 #define EXT4_MOUNT_ERRORS_PANIC		0x00040	/* Panic on errors */
1120 #define EXT4_MOUNT_ERRORS_MASK		0x00070
1121 #define EXT4_MOUNT_MINIX_DF		0x00080	/* Mimics the Minix statfs */
1122 #define EXT4_MOUNT_NOLOAD		0x00100	/* Don't use existing journal*/
1123 #ifdef CONFIG_FS_DAX
1124 #define EXT4_MOUNT_DAX			0x00200	/* Direct Access */
1125 #else
1126 #define EXT4_MOUNT_DAX			0
1127 #endif
1128 #define EXT4_MOUNT_DATA_FLAGS		0x00C00	/* Mode for data writes: */
1129 #define EXT4_MOUNT_JOURNAL_DATA		0x00400	/* Write data to journal */
1130 #define EXT4_MOUNT_ORDERED_DATA		0x00800	/* Flush data before commit */
1131 #define EXT4_MOUNT_WRITEBACK_DATA	0x00C00	/* No data ordering */
1132 #define EXT4_MOUNT_UPDATE_JOURNAL	0x01000	/* Update the journal format */
1133 #define EXT4_MOUNT_NO_UID32		0x02000  /* Disable 32-bit UIDs */
1134 #define EXT4_MOUNT_XATTR_USER		0x04000	/* Extended user attributes */
1135 #define EXT4_MOUNT_POSIX_ACL		0x08000	/* POSIX Access Control Lists */
1136 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC	0x10000	/* No auto delalloc mapping */
1137 #define EXT4_MOUNT_BARRIER		0x20000 /* Use block barriers */
1138 #define EXT4_MOUNT_QUOTA		0x40000 /* Some quota option set */
1139 #define EXT4_MOUNT_USRQUOTA		0x80000 /* "old" user quota,
1140 						 * enable enforcement for hidden
1141 						 * quota files */
1142 #define EXT4_MOUNT_GRPQUOTA		0x100000 /* "old" group quota, enable
1143 						  * enforcement for hidden quota
1144 						  * files */
1145 #define EXT4_MOUNT_PRJQUOTA		0x200000 /* Enable project quota
1146 						  * enforcement */
1147 #define EXT4_MOUNT_DIOREAD_NOLOCK	0x400000 /* Enable support for dio read nolocking */
1148 #define EXT4_MOUNT_JOURNAL_CHECKSUM	0x800000 /* Journal checksums */
1149 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT	0x1000000 /* Journal Async Commit */
1150 #define EXT4_MOUNT_DELALLOC		0x8000000 /* Delalloc support */
1151 #define EXT4_MOUNT_DATA_ERR_ABORT	0x10000000 /* Abort on file data write */
1152 #define EXT4_MOUNT_BLOCK_VALIDITY	0x20000000 /* Block validity checking */
1153 #define EXT4_MOUNT_DISCARD		0x40000000 /* Issue DISCARD requests */
1154 #define EXT4_MOUNT_INIT_INODE_TABLE	0x80000000 /* Initialize uninitialized itables */
1155 
1156 /*
1157  * Mount flags set either automatically (could not be set by mount option)
1158  * based on per file system feature or property or in special cases such as
1159  * distinguishing between explicit mount option definition and default.
1160  */
1161 #define EXT4_MOUNT2_EXPLICIT_DELALLOC	0x00000001 /* User explicitly
1162 						      specified delalloc */
1163 #define EXT4_MOUNT2_STD_GROUP_SIZE	0x00000002 /* We have standard group
1164 						      size of blocksize * 8
1165 						      blocks */
1166 #define EXT4_MOUNT2_HURD_COMPAT		0x00000004 /* Support HURD-castrated
1167 						      file systems */
1168 
1169 #define EXT4_MOUNT2_EXPLICIT_JOURNAL_CHECKSUM	0x00000008 /* User explicitly
1170 						specified journal checksum */
1171 
1172 #define clear_opt(sb, opt)		EXT4_SB(sb)->s_mount_opt &= \
1173 						~EXT4_MOUNT_##opt
1174 #define set_opt(sb, opt)		EXT4_SB(sb)->s_mount_opt |= \
1175 						EXT4_MOUNT_##opt
1176 #define test_opt(sb, opt)		(EXT4_SB(sb)->s_mount_opt & \
1177 					 EXT4_MOUNT_##opt)
1178 
1179 #define clear_opt2(sb, opt)		EXT4_SB(sb)->s_mount_opt2 &= \
1180 						~EXT4_MOUNT2_##opt
1181 #define set_opt2(sb, opt)		EXT4_SB(sb)->s_mount_opt2 |= \
1182 						EXT4_MOUNT2_##opt
1183 #define test_opt2(sb, opt)		(EXT4_SB(sb)->s_mount_opt2 & \
1184 					 EXT4_MOUNT2_##opt)
1185 
1186 #define ext4_test_and_set_bit		__test_and_set_bit_le
1187 #define ext4_set_bit			__set_bit_le
1188 #define ext4_set_bit_atomic		ext2_set_bit_atomic
1189 #define ext4_test_and_clear_bit		__test_and_clear_bit_le
1190 #define ext4_clear_bit			__clear_bit_le
1191 #define ext4_clear_bit_atomic		ext2_clear_bit_atomic
1192 #define ext4_test_bit			test_bit_le
1193 #define ext4_find_next_zero_bit		find_next_zero_bit_le
1194 #define ext4_find_next_bit		find_next_bit_le
1195 
1196 extern void ext4_set_bits(void *bm, int cur, int len);
1197 
1198 /*
1199  * Maximal mount counts between two filesystem checks
1200  */
1201 #define EXT4_DFL_MAX_MNT_COUNT		20	/* Allow 20 mounts */
1202 #define EXT4_DFL_CHECKINTERVAL		0	/* Don't use interval check */
1203 
1204 /*
1205  * Behaviour when detecting errors
1206  */
1207 #define EXT4_ERRORS_CONTINUE		1	/* Continue execution */
1208 #define EXT4_ERRORS_RO			2	/* Remount fs read-only */
1209 #define EXT4_ERRORS_PANIC		3	/* Panic */
1210 #define EXT4_ERRORS_DEFAULT		EXT4_ERRORS_CONTINUE
1211 
1212 /* Metadata checksum algorithm codes */
1213 #define EXT4_CRC32C_CHKSUM		1
1214 
1215 /*
1216  * Structure of the super block
1217  */
1218 struct ext4_super_block {
1219 /*00*/	__le32	s_inodes_count;		/* Inodes count */
1220 	__le32	s_blocks_count_lo;	/* Blocks count */
1221 	__le32	s_r_blocks_count_lo;	/* Reserved blocks count */
1222 	__le32	s_free_blocks_count_lo;	/* Free blocks count */
1223 /*10*/	__le32	s_free_inodes_count;	/* Free inodes count */
1224 	__le32	s_first_data_block;	/* First Data Block */
1225 	__le32	s_log_block_size;	/* Block size */
1226 	__le32	s_log_cluster_size;	/* Allocation cluster size */
1227 /*20*/	__le32	s_blocks_per_group;	/* # Blocks per group */
1228 	__le32	s_clusters_per_group;	/* # Clusters per group */
1229 	__le32	s_inodes_per_group;	/* # Inodes per group */
1230 	__le32	s_mtime;		/* Mount time */
1231 /*30*/	__le32	s_wtime;		/* Write time */
1232 	__le16	s_mnt_count;		/* Mount count */
1233 	__le16	s_max_mnt_count;	/* Maximal mount count */
1234 	__le16	s_magic;		/* Magic signature */
1235 	__le16	s_state;		/* File system state */
1236 	__le16	s_errors;		/* Behaviour when detecting errors */
1237 	__le16	s_minor_rev_level;	/* minor revision level */
1238 /*40*/	__le32	s_lastcheck;		/* time of last check */
1239 	__le32	s_checkinterval;	/* max. time between checks */
1240 	__le32	s_creator_os;		/* OS */
1241 	__le32	s_rev_level;		/* Revision level */
1242 /*50*/	__le16	s_def_resuid;		/* Default uid for reserved blocks */
1243 	__le16	s_def_resgid;		/* Default gid for reserved blocks */
1244 	/*
1245 	 * These fields are for EXT4_DYNAMIC_REV superblocks only.
1246 	 *
1247 	 * Note: the difference between the compatible feature set and
1248 	 * the incompatible feature set is that if there is a bit set
1249 	 * in the incompatible feature set that the kernel doesn't
1250 	 * know about, it should refuse to mount the filesystem.
1251 	 *
1252 	 * e2fsck's requirements are more strict; if it doesn't know
1253 	 * about a feature in either the compatible or incompatible
1254 	 * feature set, it must abort and not try to meddle with
1255 	 * things it doesn't understand...
1256 	 */
1257 	__le32	s_first_ino;		/* First non-reserved inode */
1258 	__le16  s_inode_size;		/* size of inode structure */
1259 	__le16	s_block_group_nr;	/* block group # of this superblock */
1260 	__le32	s_feature_compat;	/* compatible feature set */
1261 /*60*/	__le32	s_feature_incompat;	/* incompatible feature set */
1262 	__le32	s_feature_ro_compat;	/* readonly-compatible feature set */
1263 /*68*/	__u8	s_uuid[16];		/* 128-bit uuid for volume */
1264 /*78*/	char	s_volume_name[16];	/* volume name */
1265 /*88*/	char	s_last_mounted[64];	/* directory where last mounted */
1266 /*C8*/	__le32	s_algorithm_usage_bitmap; /* For compression */
1267 	/*
1268 	 * Performance hints.  Directory preallocation should only
1269 	 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
1270 	 */
1271 	__u8	s_prealloc_blocks;	/* Nr of blocks to try to preallocate*/
1272 	__u8	s_prealloc_dir_blocks;	/* Nr to preallocate for dirs */
1273 	__le16	s_reserved_gdt_blocks;	/* Per group desc for online growth */
1274 	/*
1275 	 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
1276 	 */
1277 /*D0*/	__u8	s_journal_uuid[16];	/* uuid of journal superblock */
1278 /*E0*/	__le32	s_journal_inum;		/* inode number of journal file */
1279 	__le32	s_journal_dev;		/* device number of journal file */
1280 	__le32	s_last_orphan;		/* start of list of inodes to delete */
1281 	__le32	s_hash_seed[4];		/* HTREE hash seed */
1282 	__u8	s_def_hash_version;	/* Default hash version to use */
1283 	__u8	s_jnl_backup_type;
1284 	__le16  s_desc_size;		/* size of group descriptor */
1285 /*100*/	__le32	s_default_mount_opts;
1286 	__le32	s_first_meta_bg;	/* First metablock block group */
1287 	__le32	s_mkfs_time;		/* When the filesystem was created */
1288 	__le32	s_jnl_blocks[17];	/* Backup of the journal inode */
1289 	/* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
1290 /*150*/	__le32	s_blocks_count_hi;	/* Blocks count */
1291 	__le32	s_r_blocks_count_hi;	/* Reserved blocks count */
1292 	__le32	s_free_blocks_count_hi;	/* Free blocks count */
1293 	__le16	s_min_extra_isize;	/* All inodes have at least # bytes */
1294 	__le16	s_want_extra_isize; 	/* New inodes should reserve # bytes */
1295 	__le32	s_flags;		/* Miscellaneous flags */
1296 	__le16  s_raid_stride;		/* RAID stride */
1297 	__le16  s_mmp_update_interval;  /* # seconds to wait in MMP checking */
1298 	__le64  s_mmp_block;            /* Block for multi-mount protection */
1299 	__le32  s_raid_stripe_width;    /* blocks on all data disks (N*stride)*/
1300 	__u8	s_log_groups_per_flex;  /* FLEX_BG group size */
1301 	__u8	s_checksum_type;	/* metadata checksum algorithm used */
1302 	__u8	s_encryption_level;	/* versioning level for encryption */
1303 	__u8	s_reserved_pad;		/* Padding to next 32bits */
1304 	__le64	s_kbytes_written;	/* nr of lifetime kilobytes written */
1305 	__le32	s_snapshot_inum;	/* Inode number of active snapshot */
1306 	__le32	s_snapshot_id;		/* sequential ID of active snapshot */
1307 	__le64	s_snapshot_r_blocks_count; /* reserved blocks for active
1308 					      snapshot's future use */
1309 	__le32	s_snapshot_list;	/* inode number of the head of the
1310 					   on-disk snapshot list */
1311 #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count)
1312 	__le32	s_error_count;		/* number of fs errors */
1313 	__le32	s_first_error_time;	/* first time an error happened */
1314 	__le32	s_first_error_ino;	/* inode involved in first error */
1315 	__le64	s_first_error_block;	/* block involved of first error */
1316 	__u8	s_first_error_func[32];	/* function where the error happened */
1317 	__le32	s_first_error_line;	/* line number where error happened */
1318 	__le32	s_last_error_time;	/* most recent time of an error */
1319 	__le32	s_last_error_ino;	/* inode involved in last error */
1320 	__le32	s_last_error_line;	/* line number where error happened */
1321 	__le64	s_last_error_block;	/* block involved of last error */
1322 	__u8	s_last_error_func[32];	/* function where the error happened */
1323 #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts)
1324 	__u8	s_mount_opts[64];
1325 	__le32	s_usr_quota_inum;	/* inode for tracking user quota */
1326 	__le32	s_grp_quota_inum;	/* inode for tracking group quota */
1327 	__le32	s_overhead_clusters;	/* overhead blocks/clusters in fs */
1328 	__le32	s_backup_bgs[2];	/* groups with sparse_super2 SBs */
1329 	__u8	s_encrypt_algos[4];	/* Encryption algorithms in use  */
1330 	__u8	s_encrypt_pw_salt[16];	/* Salt used for string2key algorithm */
1331 	__le32	s_lpf_ino;		/* Location of the lost+found inode */
1332 	__le32	s_prj_quota_inum;	/* inode for tracking project quota */
1333 	__le32	s_checksum_seed;	/* crc32c(uuid) if csum_seed set */
1334 	__le32	s_reserved[98];		/* Padding to the end of the block */
1335 	__le32	s_checksum;		/* crc32c(superblock) */
1336 };
1337 
1338 #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START)
1339 
1340 #ifdef __KERNEL__
1341 
1342 /*
1343  * run-time mount flags
1344  */
1345 #define EXT4_MF_MNTDIR_SAMPLED		0x0001
1346 #define EXT4_MF_FS_ABORTED		0x0002	/* Fatal error detected */
1347 #define EXT4_MF_TEST_DUMMY_ENCRYPTION	0x0004
1348 
1349 #ifdef CONFIG_EXT4_FS_ENCRYPTION
1350 #define DUMMY_ENCRYPTION_ENABLED(sbi) (unlikely((sbi)->s_mount_flags & \
1351 						EXT4_MF_TEST_DUMMY_ENCRYPTION))
1352 #else
1353 #define DUMMY_ENCRYPTION_ENABLED(sbi) (0)
1354 #endif
1355 
1356 /* Number of quota types we support */
1357 #define EXT4_MAXQUOTAS 3
1358 
1359 /*
1360  * fourth extended-fs super-block data in memory
1361  */
1362 struct ext4_sb_info {
1363 	unsigned long s_desc_size;	/* Size of a group descriptor in bytes */
1364 	unsigned long s_inodes_per_block;/* Number of inodes per block */
1365 	unsigned long s_blocks_per_group;/* Number of blocks in a group */
1366 	unsigned long s_clusters_per_group; /* Number of clusters in a group */
1367 	unsigned long s_inodes_per_group;/* Number of inodes in a group */
1368 	unsigned long s_itb_per_group;	/* Number of inode table blocks per group */
1369 	unsigned long s_gdb_count;	/* Number of group descriptor blocks */
1370 	unsigned long s_desc_per_block;	/* Number of group descriptors per block */
1371 	ext4_group_t s_groups_count;	/* Number of groups in the fs */
1372 	ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */
1373 	unsigned long s_overhead;  /* # of fs overhead clusters */
1374 	unsigned int s_cluster_ratio;	/* Number of blocks per cluster */
1375 	unsigned int s_cluster_bits;	/* log2 of s_cluster_ratio */
1376 	loff_t s_bitmap_maxbytes;	/* max bytes for bitmap files */
1377 	struct buffer_head * s_sbh;	/* Buffer containing the super block */
1378 	struct ext4_super_block *s_es;	/* Pointer to the super block in the buffer */
1379 	struct buffer_head **s_group_desc;
1380 	unsigned int s_mount_opt;
1381 	unsigned int s_mount_opt2;
1382 	unsigned int s_mount_flags;
1383 	unsigned int s_def_mount_opt;
1384 	ext4_fsblk_t s_sb_block;
1385 	atomic64_t s_resv_clusters;
1386 	kuid_t s_resuid;
1387 	kgid_t s_resgid;
1388 	unsigned short s_mount_state;
1389 	unsigned short s_pad;
1390 	int s_addr_per_block_bits;
1391 	int s_desc_per_block_bits;
1392 	int s_inode_size;
1393 	int s_first_ino;
1394 	unsigned int s_inode_readahead_blks;
1395 	unsigned int s_inode_goal;
1396 	spinlock_t s_next_gen_lock;
1397 	u32 s_next_generation;
1398 	u32 s_hash_seed[4];
1399 	int s_def_hash_version;
1400 	int s_hash_unsigned;	/* 3 if hash should be signed, 0 if not */
1401 	struct percpu_counter s_freeclusters_counter;
1402 	struct percpu_counter s_freeinodes_counter;
1403 	struct percpu_counter s_dirs_counter;
1404 	struct percpu_counter s_dirtyclusters_counter;
1405 	struct blockgroup_lock *s_blockgroup_lock;
1406 	struct proc_dir_entry *s_proc;
1407 	struct kobject s_kobj;
1408 	struct completion s_kobj_unregister;
1409 	struct super_block *s_sb;
1410 
1411 	/* Journaling */
1412 	struct journal_s *s_journal;
1413 	struct list_head s_orphan;
1414 	struct mutex s_orphan_lock;
1415 	unsigned long s_ext4_flags;		/* Ext4 superblock flags */
1416 	unsigned long s_commit_interval;
1417 	u32 s_max_batch_time;
1418 	u32 s_min_batch_time;
1419 	struct block_device *journal_bdev;
1420 #ifdef CONFIG_QUOTA
1421 	char *s_qf_names[EXT4_MAXQUOTAS];	/* Names of quota files with journalled quota */
1422 	int s_jquota_fmt;			/* Format of quota to use */
1423 #endif
1424 	unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */
1425 	struct rb_root system_blks;
1426 
1427 #ifdef EXTENTS_STATS
1428 	/* ext4 extents stats */
1429 	unsigned long s_ext_min;
1430 	unsigned long s_ext_max;
1431 	unsigned long s_depth_max;
1432 	spinlock_t s_ext_stats_lock;
1433 	unsigned long s_ext_blocks;
1434 	unsigned long s_ext_extents;
1435 #endif
1436 
1437 	/* for buddy allocator */
1438 	struct ext4_group_info ***s_group_info;
1439 	struct inode *s_buddy_cache;
1440 	spinlock_t s_md_lock;
1441 	unsigned short *s_mb_offsets;
1442 	unsigned int *s_mb_maxs;
1443 	unsigned int s_group_info_size;
1444 	unsigned int s_mb_free_pending;
1445 	struct list_head s_freed_data_list;	/* List of blocks to be freed
1446 						   after commit completed */
1447 
1448 	/* tunables */
1449 	unsigned long s_stripe;
1450 	unsigned int s_mb_stream_request;
1451 	unsigned int s_mb_max_to_scan;
1452 	unsigned int s_mb_min_to_scan;
1453 	unsigned int s_mb_stats;
1454 	unsigned int s_mb_order2_reqs;
1455 	unsigned int s_mb_group_prealloc;
1456 	unsigned int s_max_dir_size_kb;
1457 	/* where last allocation was done - for stream allocation */
1458 	unsigned long s_mb_last_group;
1459 	unsigned long s_mb_last_start;
1460 
1461 	/* stats for buddy allocator */
1462 	atomic_t s_bal_reqs;	/* number of reqs with len > 1 */
1463 	atomic_t s_bal_success;	/* we found long enough chunks */
1464 	atomic_t s_bal_allocated;	/* in blocks */
1465 	atomic_t s_bal_ex_scanned;	/* total extents scanned */
1466 	atomic_t s_bal_goals;	/* goal hits */
1467 	atomic_t s_bal_breaks;	/* too long searches */
1468 	atomic_t s_bal_2orders;	/* 2^order hits */
1469 	spinlock_t s_bal_lock;
1470 	unsigned long s_mb_buddies_generated;
1471 	unsigned long long s_mb_generation_time;
1472 	atomic_t s_mb_lost_chunks;
1473 	atomic_t s_mb_preallocated;
1474 	atomic_t s_mb_discarded;
1475 	atomic_t s_lock_busy;
1476 
1477 	/* locality groups */
1478 	struct ext4_locality_group __percpu *s_locality_groups;
1479 
1480 	/* for write statistics */
1481 	unsigned long s_sectors_written_start;
1482 	u64 s_kbytes_written;
1483 
1484 	/* the size of zero-out chunk */
1485 	unsigned int s_extent_max_zeroout_kb;
1486 
1487 	unsigned int s_log_groups_per_flex;
1488 	struct flex_groups *s_flex_groups;
1489 	ext4_group_t s_flex_groups_allocated;
1490 
1491 	/* workqueue for reserved extent conversions (buffered io) */
1492 	struct workqueue_struct *rsv_conversion_wq;
1493 
1494 	/* timer for periodic error stats printing */
1495 	struct timer_list s_err_report;
1496 
1497 	/* Lazy inode table initialization info */
1498 	struct ext4_li_request *s_li_request;
1499 	/* Wait multiplier for lazy initialization thread */
1500 	unsigned int s_li_wait_mult;
1501 
1502 	/* Kernel thread for multiple mount protection */
1503 	struct task_struct *s_mmp_tsk;
1504 
1505 	/* record the last minlen when FITRIM is called. */
1506 	atomic_t s_last_trim_minblks;
1507 
1508 	/* Reference to checksum algorithm driver via cryptoapi */
1509 	struct crypto_shash *s_chksum_driver;
1510 
1511 	/* Precomputed FS UUID checksum for seeding other checksums */
1512 	__u32 s_csum_seed;
1513 
1514 	/* Reclaim extents from extent status tree */
1515 	struct shrinker s_es_shrinker;
1516 	struct list_head s_es_list;	/* List of inodes with reclaimable extents */
1517 	long s_es_nr_inode;
1518 	struct ext4_es_stats s_es_stats;
1519 	struct mb_cache *s_ea_block_cache;
1520 	struct mb_cache *s_ea_inode_cache;
1521 	spinlock_t s_es_lock ____cacheline_aligned_in_smp;
1522 
1523 	/* Ratelimit ext4 messages. */
1524 	struct ratelimit_state s_err_ratelimit_state;
1525 	struct ratelimit_state s_warning_ratelimit_state;
1526 	struct ratelimit_state s_msg_ratelimit_state;
1527 
1528 	/* Barrier between changing inodes' journal flags and writepages ops. */
1529 	struct percpu_rw_semaphore s_journal_flag_rwsem;
1530 	struct dax_device *s_daxdev;
1531 };
1532 
1533 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb)
1534 {
1535 	return sb->s_fs_info;
1536 }
1537 static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
1538 {
1539 	return container_of(inode, struct ext4_inode_info, vfs_inode);
1540 }
1541 
1542 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
1543 {
1544 	return ino == EXT4_ROOT_INO ||
1545 		ino == EXT4_USR_QUOTA_INO ||
1546 		ino == EXT4_GRP_QUOTA_INO ||
1547 		ino == EXT4_BOOT_LOADER_INO ||
1548 		ino == EXT4_JOURNAL_INO ||
1549 		ino == EXT4_RESIZE_INO ||
1550 		(ino >= EXT4_FIRST_INO(sb) &&
1551 		 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
1552 }
1553 
1554 /*
1555  * Inode dynamic state flags
1556  */
1557 enum {
1558 	EXT4_STATE_JDATA,		/* journaled data exists */
1559 	EXT4_STATE_NEW,			/* inode is newly created */
1560 	EXT4_STATE_XATTR,		/* has in-inode xattrs */
1561 	EXT4_STATE_NO_EXPAND,		/* No space for expansion */
1562 	EXT4_STATE_DA_ALLOC_CLOSE,	/* Alloc DA blks on close */
1563 	EXT4_STATE_EXT_MIGRATE,		/* Inode is migrating */
1564 	EXT4_STATE_DIO_UNWRITTEN,	/* need convert on dio done*/
1565 	EXT4_STATE_NEWENTRY,		/* File just added to dir */
1566 	EXT4_STATE_DIOREAD_LOCK,	/* Disable support for dio read
1567 					   nolocking */
1568 	EXT4_STATE_MAY_INLINE_DATA,	/* may have in-inode data */
1569 	EXT4_STATE_EXT_PRECACHED,	/* extents have been precached */
1570 	EXT4_STATE_LUSTRE_EA_INODE,	/* Lustre-style ea_inode */
1571 };
1572 
1573 #define EXT4_INODE_BIT_FNS(name, field, offset)				\
1574 static inline int ext4_test_inode_##name(struct inode *inode, int bit)	\
1575 {									\
1576 	return test_bit(bit + (offset), &EXT4_I(inode)->i_##field);	\
1577 }									\
1578 static inline void ext4_set_inode_##name(struct inode *inode, int bit)	\
1579 {									\
1580 	set_bit(bit + (offset), &EXT4_I(inode)->i_##field);		\
1581 }									\
1582 static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \
1583 {									\
1584 	clear_bit(bit + (offset), &EXT4_I(inode)->i_##field);		\
1585 }
1586 
1587 /* Add these declarations here only so that these functions can be
1588  * found by name.  Otherwise, they are very hard to locate. */
1589 static inline int ext4_test_inode_flag(struct inode *inode, int bit);
1590 static inline void ext4_set_inode_flag(struct inode *inode, int bit);
1591 static inline void ext4_clear_inode_flag(struct inode *inode, int bit);
1592 EXT4_INODE_BIT_FNS(flag, flags, 0)
1593 
1594 /* Add these declarations here only so that these functions can be
1595  * found by name.  Otherwise, they are very hard to locate. */
1596 static inline int ext4_test_inode_state(struct inode *inode, int bit);
1597 static inline void ext4_set_inode_state(struct inode *inode, int bit);
1598 static inline void ext4_clear_inode_state(struct inode *inode, int bit);
1599 #if (BITS_PER_LONG < 64)
1600 EXT4_INODE_BIT_FNS(state, state_flags, 0)
1601 
1602 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1603 {
1604 	(ei)->i_state_flags = 0;
1605 }
1606 #else
1607 EXT4_INODE_BIT_FNS(state, flags, 32)
1608 
1609 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1610 {
1611 	/* We depend on the fact that callers will set i_flags */
1612 }
1613 #endif
1614 #else
1615 /* Assume that user mode programs are passing in an ext4fs superblock, not
1616  * a kernel struct super_block.  This will allow us to call the feature-test
1617  * macros from user land. */
1618 #define EXT4_SB(sb)	(sb)
1619 #endif
1620 
1621 /*
1622  * Returns true if the inode is inode is encrypted
1623  */
1624 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
1625 
1626 /*
1627  * Codes for operating systems
1628  */
1629 #define EXT4_OS_LINUX		0
1630 #define EXT4_OS_HURD		1
1631 #define EXT4_OS_MASIX		2
1632 #define EXT4_OS_FREEBSD		3
1633 #define EXT4_OS_LITES		4
1634 
1635 /*
1636  * Revision levels
1637  */
1638 #define EXT4_GOOD_OLD_REV	0	/* The good old (original) format */
1639 #define EXT4_DYNAMIC_REV	1	/* V2 format w/ dynamic inode sizes */
1640 
1641 #define EXT4_CURRENT_REV	EXT4_GOOD_OLD_REV
1642 #define EXT4_MAX_SUPP_REV	EXT4_DYNAMIC_REV
1643 
1644 #define EXT4_GOOD_OLD_INODE_SIZE 128
1645 
1646 /*
1647  * Feature set definitions
1648  */
1649 
1650 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC	0x0001
1651 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES	0x0002
1652 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL		0x0004
1653 #define EXT4_FEATURE_COMPAT_EXT_ATTR		0x0008
1654 #define EXT4_FEATURE_COMPAT_RESIZE_INODE	0x0010
1655 #define EXT4_FEATURE_COMPAT_DIR_INDEX		0x0020
1656 #define EXT4_FEATURE_COMPAT_SPARSE_SUPER2	0x0200
1657 
1658 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER	0x0001
1659 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE	0x0002
1660 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR	0x0004
1661 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE        0x0008
1662 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM		0x0010
1663 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK	0x0020
1664 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE	0x0040
1665 #define EXT4_FEATURE_RO_COMPAT_QUOTA		0x0100
1666 #define EXT4_FEATURE_RO_COMPAT_BIGALLOC		0x0200
1667 /*
1668  * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM).  When
1669  * METADATA_CSUM is set, group descriptor checksums use the same algorithm as
1670  * all other data structures' checksums.  However, the METADATA_CSUM and
1671  * GDT_CSUM bits are mutually exclusive.
1672  */
1673 #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM	0x0400
1674 #define EXT4_FEATURE_RO_COMPAT_READONLY		0x1000
1675 #define EXT4_FEATURE_RO_COMPAT_PROJECT		0x2000
1676 
1677 #define EXT4_FEATURE_INCOMPAT_COMPRESSION	0x0001
1678 #define EXT4_FEATURE_INCOMPAT_FILETYPE		0x0002
1679 #define EXT4_FEATURE_INCOMPAT_RECOVER		0x0004 /* Needs recovery */
1680 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV	0x0008 /* Journal device */
1681 #define EXT4_FEATURE_INCOMPAT_META_BG		0x0010
1682 #define EXT4_FEATURE_INCOMPAT_EXTENTS		0x0040 /* extents support */
1683 #define EXT4_FEATURE_INCOMPAT_64BIT		0x0080
1684 #define EXT4_FEATURE_INCOMPAT_MMP               0x0100
1685 #define EXT4_FEATURE_INCOMPAT_FLEX_BG		0x0200
1686 #define EXT4_FEATURE_INCOMPAT_EA_INODE		0x0400 /* EA in inode */
1687 #define EXT4_FEATURE_INCOMPAT_DIRDATA		0x1000 /* data in dirent */
1688 #define EXT4_FEATURE_INCOMPAT_CSUM_SEED		0x2000
1689 #define EXT4_FEATURE_INCOMPAT_LARGEDIR		0x4000 /* >2GB or 3-lvl htree */
1690 #define EXT4_FEATURE_INCOMPAT_INLINE_DATA	0x8000 /* data in inode */
1691 #define EXT4_FEATURE_INCOMPAT_ENCRYPT		0x10000
1692 
1693 #define EXT4_FEATURE_COMPAT_FUNCS(name, flagname) \
1694 static inline bool ext4_has_feature_##name(struct super_block *sb) \
1695 { \
1696 	return ((EXT4_SB(sb)->s_es->s_feature_compat & \
1697 		cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname)) != 0); \
1698 } \
1699 static inline void ext4_set_feature_##name(struct super_block *sb) \
1700 { \
1701 	EXT4_SB(sb)->s_es->s_feature_compat |= \
1702 		cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \
1703 } \
1704 static inline void ext4_clear_feature_##name(struct super_block *sb) \
1705 { \
1706 	EXT4_SB(sb)->s_es->s_feature_compat &= \
1707 		~cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \
1708 }
1709 
1710 #define EXT4_FEATURE_RO_COMPAT_FUNCS(name, flagname) \
1711 static inline bool ext4_has_feature_##name(struct super_block *sb) \
1712 { \
1713 	return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \
1714 		cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname)) != 0); \
1715 } \
1716 static inline void ext4_set_feature_##name(struct super_block *sb) \
1717 { \
1718 	EXT4_SB(sb)->s_es->s_feature_ro_compat |= \
1719 		cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \
1720 } \
1721 static inline void ext4_clear_feature_##name(struct super_block *sb) \
1722 { \
1723 	EXT4_SB(sb)->s_es->s_feature_ro_compat &= \
1724 		~cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \
1725 }
1726 
1727 #define EXT4_FEATURE_INCOMPAT_FUNCS(name, flagname) \
1728 static inline bool ext4_has_feature_##name(struct super_block *sb) \
1729 { \
1730 	return ((EXT4_SB(sb)->s_es->s_feature_incompat & \
1731 		cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname)) != 0); \
1732 } \
1733 static inline void ext4_set_feature_##name(struct super_block *sb) \
1734 { \
1735 	EXT4_SB(sb)->s_es->s_feature_incompat |= \
1736 		cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \
1737 } \
1738 static inline void ext4_clear_feature_##name(struct super_block *sb) \
1739 { \
1740 	EXT4_SB(sb)->s_es->s_feature_incompat &= \
1741 		~cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \
1742 }
1743 
1744 EXT4_FEATURE_COMPAT_FUNCS(dir_prealloc,		DIR_PREALLOC)
1745 EXT4_FEATURE_COMPAT_FUNCS(imagic_inodes,	IMAGIC_INODES)
1746 EXT4_FEATURE_COMPAT_FUNCS(journal,		HAS_JOURNAL)
1747 EXT4_FEATURE_COMPAT_FUNCS(xattr,		EXT_ATTR)
1748 EXT4_FEATURE_COMPAT_FUNCS(resize_inode,		RESIZE_INODE)
1749 EXT4_FEATURE_COMPAT_FUNCS(dir_index,		DIR_INDEX)
1750 EXT4_FEATURE_COMPAT_FUNCS(sparse_super2,	SPARSE_SUPER2)
1751 
1752 EXT4_FEATURE_RO_COMPAT_FUNCS(sparse_super,	SPARSE_SUPER)
1753 EXT4_FEATURE_RO_COMPAT_FUNCS(large_file,	LARGE_FILE)
1754 EXT4_FEATURE_RO_COMPAT_FUNCS(btree_dir,		BTREE_DIR)
1755 EXT4_FEATURE_RO_COMPAT_FUNCS(huge_file,		HUGE_FILE)
1756 EXT4_FEATURE_RO_COMPAT_FUNCS(gdt_csum,		GDT_CSUM)
1757 EXT4_FEATURE_RO_COMPAT_FUNCS(dir_nlink,		DIR_NLINK)
1758 EXT4_FEATURE_RO_COMPAT_FUNCS(extra_isize,	EXTRA_ISIZE)
1759 EXT4_FEATURE_RO_COMPAT_FUNCS(quota,		QUOTA)
1760 EXT4_FEATURE_RO_COMPAT_FUNCS(bigalloc,		BIGALLOC)
1761 EXT4_FEATURE_RO_COMPAT_FUNCS(metadata_csum,	METADATA_CSUM)
1762 EXT4_FEATURE_RO_COMPAT_FUNCS(readonly,		READONLY)
1763 EXT4_FEATURE_RO_COMPAT_FUNCS(project,		PROJECT)
1764 
1765 EXT4_FEATURE_INCOMPAT_FUNCS(compression,	COMPRESSION)
1766 EXT4_FEATURE_INCOMPAT_FUNCS(filetype,		FILETYPE)
1767 EXT4_FEATURE_INCOMPAT_FUNCS(journal_needs_recovery,	RECOVER)
1768 EXT4_FEATURE_INCOMPAT_FUNCS(journal_dev,	JOURNAL_DEV)
1769 EXT4_FEATURE_INCOMPAT_FUNCS(meta_bg,		META_BG)
1770 EXT4_FEATURE_INCOMPAT_FUNCS(extents,		EXTENTS)
1771 EXT4_FEATURE_INCOMPAT_FUNCS(64bit,		64BIT)
1772 EXT4_FEATURE_INCOMPAT_FUNCS(mmp,		MMP)
1773 EXT4_FEATURE_INCOMPAT_FUNCS(flex_bg,		FLEX_BG)
1774 EXT4_FEATURE_INCOMPAT_FUNCS(ea_inode,		EA_INODE)
1775 EXT4_FEATURE_INCOMPAT_FUNCS(dirdata,		DIRDATA)
1776 EXT4_FEATURE_INCOMPAT_FUNCS(csum_seed,		CSUM_SEED)
1777 EXT4_FEATURE_INCOMPAT_FUNCS(largedir,		LARGEDIR)
1778 EXT4_FEATURE_INCOMPAT_FUNCS(inline_data,	INLINE_DATA)
1779 EXT4_FEATURE_INCOMPAT_FUNCS(encrypt,		ENCRYPT)
1780 
1781 #define EXT2_FEATURE_COMPAT_SUPP	EXT4_FEATURE_COMPAT_EXT_ATTR
1782 #define EXT2_FEATURE_INCOMPAT_SUPP	(EXT4_FEATURE_INCOMPAT_FILETYPE| \
1783 					 EXT4_FEATURE_INCOMPAT_META_BG)
1784 #define EXT2_FEATURE_RO_COMPAT_SUPP	(EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1785 					 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1786 					 EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
1787 
1788 #define EXT3_FEATURE_COMPAT_SUPP	EXT4_FEATURE_COMPAT_EXT_ATTR
1789 #define EXT3_FEATURE_INCOMPAT_SUPP	(EXT4_FEATURE_INCOMPAT_FILETYPE| \
1790 					 EXT4_FEATURE_INCOMPAT_RECOVER| \
1791 					 EXT4_FEATURE_INCOMPAT_META_BG)
1792 #define EXT3_FEATURE_RO_COMPAT_SUPP	(EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1793 					 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1794 					 EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
1795 
1796 #define EXT4_FEATURE_COMPAT_SUPP	EXT4_FEATURE_COMPAT_EXT_ATTR
1797 #define EXT4_FEATURE_INCOMPAT_SUPP	(EXT4_FEATURE_INCOMPAT_FILETYPE| \
1798 					 EXT4_FEATURE_INCOMPAT_RECOVER| \
1799 					 EXT4_FEATURE_INCOMPAT_META_BG| \
1800 					 EXT4_FEATURE_INCOMPAT_EXTENTS| \
1801 					 EXT4_FEATURE_INCOMPAT_64BIT| \
1802 					 EXT4_FEATURE_INCOMPAT_FLEX_BG| \
1803 					 EXT4_FEATURE_INCOMPAT_EA_INODE| \
1804 					 EXT4_FEATURE_INCOMPAT_MMP | \
1805 					 EXT4_FEATURE_INCOMPAT_INLINE_DATA | \
1806 					 EXT4_FEATURE_INCOMPAT_ENCRYPT | \
1807 					 EXT4_FEATURE_INCOMPAT_CSUM_SEED | \
1808 					 EXT4_FEATURE_INCOMPAT_LARGEDIR)
1809 #define EXT4_FEATURE_RO_COMPAT_SUPP	(EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1810 					 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1811 					 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
1812 					 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
1813 					 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
1814 					 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
1815 					 EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\
1816 					 EXT4_FEATURE_RO_COMPAT_BIGALLOC |\
1817 					 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\
1818 					 EXT4_FEATURE_RO_COMPAT_QUOTA |\
1819 					 EXT4_FEATURE_RO_COMPAT_PROJECT)
1820 
1821 #define EXTN_FEATURE_FUNCS(ver) \
1822 static inline bool ext4_has_unknown_ext##ver##_compat_features(struct super_block *sb) \
1823 { \
1824 	return ((EXT4_SB(sb)->s_es->s_feature_compat & \
1825 		cpu_to_le32(~EXT##ver##_FEATURE_COMPAT_SUPP)) != 0); \
1826 } \
1827 static inline bool ext4_has_unknown_ext##ver##_ro_compat_features(struct super_block *sb) \
1828 { \
1829 	return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \
1830 		cpu_to_le32(~EXT##ver##_FEATURE_RO_COMPAT_SUPP)) != 0); \
1831 } \
1832 static inline bool ext4_has_unknown_ext##ver##_incompat_features(struct super_block *sb) \
1833 { \
1834 	return ((EXT4_SB(sb)->s_es->s_feature_incompat & \
1835 		cpu_to_le32(~EXT##ver##_FEATURE_INCOMPAT_SUPP)) != 0); \
1836 }
1837 
1838 EXTN_FEATURE_FUNCS(2)
1839 EXTN_FEATURE_FUNCS(3)
1840 EXTN_FEATURE_FUNCS(4)
1841 
1842 static inline bool ext4_has_compat_features(struct super_block *sb)
1843 {
1844 	return (EXT4_SB(sb)->s_es->s_feature_compat != 0);
1845 }
1846 static inline bool ext4_has_ro_compat_features(struct super_block *sb)
1847 {
1848 	return (EXT4_SB(sb)->s_es->s_feature_ro_compat != 0);
1849 }
1850 static inline bool ext4_has_incompat_features(struct super_block *sb)
1851 {
1852 	return (EXT4_SB(sb)->s_es->s_feature_incompat != 0);
1853 }
1854 
1855 /*
1856  * Superblock flags
1857  */
1858 #define EXT4_FLAGS_RESIZING	0
1859 #define EXT4_FLAGS_SHUTDOWN	1
1860 
1861 static inline int ext4_forced_shutdown(struct ext4_sb_info *sbi)
1862 {
1863 	return test_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
1864 }
1865 
1866 
1867 /*
1868  * Default values for user and/or group using reserved blocks
1869  */
1870 #define	EXT4_DEF_RESUID		0
1871 #define	EXT4_DEF_RESGID		0
1872 
1873 /*
1874  * Default project ID
1875  */
1876 #define	EXT4_DEF_PROJID		0
1877 
1878 #define EXT4_DEF_INODE_READAHEAD_BLKS	32
1879 
1880 /*
1881  * Default mount options
1882  */
1883 #define EXT4_DEFM_DEBUG		0x0001
1884 #define EXT4_DEFM_BSDGROUPS	0x0002
1885 #define EXT4_DEFM_XATTR_USER	0x0004
1886 #define EXT4_DEFM_ACL		0x0008
1887 #define EXT4_DEFM_UID16		0x0010
1888 #define EXT4_DEFM_JMODE		0x0060
1889 #define EXT4_DEFM_JMODE_DATA	0x0020
1890 #define EXT4_DEFM_JMODE_ORDERED	0x0040
1891 #define EXT4_DEFM_JMODE_WBACK	0x0060
1892 #define EXT4_DEFM_NOBARRIER	0x0100
1893 #define EXT4_DEFM_BLOCK_VALIDITY 0x0200
1894 #define EXT4_DEFM_DISCARD	0x0400
1895 #define EXT4_DEFM_NODELALLOC	0x0800
1896 
1897 /*
1898  * Default journal batch times
1899  */
1900 #define EXT4_DEF_MIN_BATCH_TIME	0
1901 #define EXT4_DEF_MAX_BATCH_TIME	15000 /* 15ms */
1902 
1903 /*
1904  * Minimum number of groups in a flexgroup before we separate out
1905  * directories into the first block group of a flexgroup
1906  */
1907 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME	4
1908 
1909 /*
1910  * Structure of a directory entry
1911  */
1912 #define EXT4_NAME_LEN 255
1913 
1914 struct ext4_dir_entry {
1915 	__le32	inode;			/* Inode number */
1916 	__le16	rec_len;		/* Directory entry length */
1917 	__le16	name_len;		/* Name length */
1918 	char	name[EXT4_NAME_LEN];	/* File name */
1919 };
1920 
1921 /*
1922  * The new version of the directory entry.  Since EXT4 structures are
1923  * stored in intel byte order, and the name_len field could never be
1924  * bigger than 255 chars, it's safe to reclaim the extra byte for the
1925  * file_type field.
1926  */
1927 struct ext4_dir_entry_2 {
1928 	__le32	inode;			/* Inode number */
1929 	__le16	rec_len;		/* Directory entry length */
1930 	__u8	name_len;		/* Name length */
1931 	__u8	file_type;
1932 	char	name[EXT4_NAME_LEN];	/* File name */
1933 };
1934 
1935 /*
1936  * This is a bogus directory entry at the end of each leaf block that
1937  * records checksums.
1938  */
1939 struct ext4_dir_entry_tail {
1940 	__le32	det_reserved_zero1;	/* Pretend to be unused */
1941 	__le16	det_rec_len;		/* 12 */
1942 	__u8	det_reserved_zero2;	/* Zero name length */
1943 	__u8	det_reserved_ft;	/* 0xDE, fake file type */
1944 	__le32	det_checksum;		/* crc32c(uuid+inum+dirblock) */
1945 };
1946 
1947 #define EXT4_DIRENT_TAIL(block, blocksize) \
1948 	((struct ext4_dir_entry_tail *)(((void *)(block)) + \
1949 					((blocksize) - \
1950 					 sizeof(struct ext4_dir_entry_tail))))
1951 
1952 /*
1953  * Ext4 directory file types.  Only the low 3 bits are used.  The
1954  * other bits are reserved for now.
1955  */
1956 #define EXT4_FT_UNKNOWN		0
1957 #define EXT4_FT_REG_FILE	1
1958 #define EXT4_FT_DIR		2
1959 #define EXT4_FT_CHRDEV		3
1960 #define EXT4_FT_BLKDEV		4
1961 #define EXT4_FT_FIFO		5
1962 #define EXT4_FT_SOCK		6
1963 #define EXT4_FT_SYMLINK		7
1964 
1965 #define EXT4_FT_MAX		8
1966 
1967 #define EXT4_FT_DIR_CSUM	0xDE
1968 
1969 /*
1970  * EXT4_DIR_PAD defines the directory entries boundaries
1971  *
1972  * NOTE: It must be a multiple of 4
1973  */
1974 #define EXT4_DIR_PAD			4
1975 #define EXT4_DIR_ROUND			(EXT4_DIR_PAD - 1)
1976 #define EXT4_DIR_REC_LEN(name_len)	(((name_len) + 8 + EXT4_DIR_ROUND) & \
1977 					 ~EXT4_DIR_ROUND)
1978 #define EXT4_MAX_REC_LEN		((1<<16)-1)
1979 
1980 /*
1981  * If we ever get support for fs block sizes > page_size, we'll need
1982  * to remove the #if statements in the next two functions...
1983  */
1984 static inline unsigned int
1985 ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize)
1986 {
1987 	unsigned len = le16_to_cpu(dlen);
1988 
1989 #if (PAGE_SIZE >= 65536)
1990 	if (len == EXT4_MAX_REC_LEN || len == 0)
1991 		return blocksize;
1992 	return (len & 65532) | ((len & 3) << 16);
1993 #else
1994 	return len;
1995 #endif
1996 }
1997 
1998 static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize)
1999 {
2000 	if ((len > blocksize) || (blocksize > (1 << 18)) || (len & 3))
2001 		BUG();
2002 #if (PAGE_SIZE >= 65536)
2003 	if (len < 65536)
2004 		return cpu_to_le16(len);
2005 	if (len == blocksize) {
2006 		if (blocksize == 65536)
2007 			return cpu_to_le16(EXT4_MAX_REC_LEN);
2008 		else
2009 			return cpu_to_le16(0);
2010 	}
2011 	return cpu_to_le16((len & 65532) | ((len >> 16) & 3));
2012 #else
2013 	return cpu_to_le16(len);
2014 #endif
2015 }
2016 
2017 /*
2018  * Hash Tree Directory indexing
2019  * (c) Daniel Phillips, 2001
2020  */
2021 
2022 #define is_dx(dir) (ext4_has_feature_dir_index((dir)->i_sb) && \
2023 		    ext4_test_inode_flag((dir), EXT4_INODE_INDEX))
2024 #define EXT4_DIR_LINK_MAX(dir) unlikely((dir)->i_nlink >= EXT4_LINK_MAX && \
2025 		    !(ext4_has_feature_dir_nlink((dir)->i_sb) && is_dx(dir)))
2026 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
2027 
2028 /* Legal values for the dx_root hash_version field: */
2029 
2030 #define DX_HASH_LEGACY		0
2031 #define DX_HASH_HALF_MD4	1
2032 #define DX_HASH_TEA		2
2033 #define DX_HASH_LEGACY_UNSIGNED	3
2034 #define DX_HASH_HALF_MD4_UNSIGNED	4
2035 #define DX_HASH_TEA_UNSIGNED		5
2036 
2037 static inline u32 ext4_chksum(struct ext4_sb_info *sbi, u32 crc,
2038 			      const void *address, unsigned int length)
2039 {
2040 	struct {
2041 		struct shash_desc shash;
2042 		char ctx[4];
2043 	} desc;
2044 	int err;
2045 
2046 	BUG_ON(crypto_shash_descsize(sbi->s_chksum_driver)!=sizeof(desc.ctx));
2047 
2048 	desc.shash.tfm = sbi->s_chksum_driver;
2049 	desc.shash.flags = 0;
2050 	*(u32 *)desc.ctx = crc;
2051 
2052 	err = crypto_shash_update(&desc.shash, address, length);
2053 	BUG_ON(err);
2054 
2055 	return *(u32 *)desc.ctx;
2056 }
2057 
2058 #ifdef __KERNEL__
2059 
2060 /* hash info structure used by the directory hash */
2061 struct dx_hash_info
2062 {
2063 	u32		hash;
2064 	u32		minor_hash;
2065 	int		hash_version;
2066 	u32		*seed;
2067 };
2068 
2069 
2070 /* 32 and 64 bit signed EOF for dx directories */
2071 #define EXT4_HTREE_EOF_32BIT   ((1UL  << (32 - 1)) - 1)
2072 #define EXT4_HTREE_EOF_64BIT   ((1ULL << (64 - 1)) - 1)
2073 
2074 
2075 /*
2076  * Control parameters used by ext4_htree_next_block
2077  */
2078 #define HASH_NB_ALWAYS		1
2079 
2080 struct ext4_filename {
2081 	const struct qstr *usr_fname;
2082 	struct fscrypt_str disk_name;
2083 	struct dx_hash_info hinfo;
2084 #ifdef CONFIG_EXT4_FS_ENCRYPTION
2085 	struct fscrypt_str crypto_buf;
2086 #endif
2087 };
2088 
2089 #define fname_name(p) ((p)->disk_name.name)
2090 #define fname_len(p)  ((p)->disk_name.len)
2091 
2092 /*
2093  * Describe an inode's exact location on disk and in memory
2094  */
2095 struct ext4_iloc
2096 {
2097 	struct buffer_head *bh;
2098 	unsigned long offset;
2099 	ext4_group_t block_group;
2100 };
2101 
2102 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
2103 {
2104 	return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
2105 }
2106 
2107 static inline bool ext4_is_quota_file(struct inode *inode)
2108 {
2109 	return IS_NOQUOTA(inode) &&
2110 	       !(EXT4_I(inode)->i_flags & EXT4_EA_INODE_FL);
2111 }
2112 
2113 /*
2114  * This structure is stuffed into the struct file's private_data field
2115  * for directories.  It is where we put information so that we can do
2116  * readdir operations in hash tree order.
2117  */
2118 struct dir_private_info {
2119 	struct rb_root	root;
2120 	struct rb_node	*curr_node;
2121 	struct fname	*extra_fname;
2122 	loff_t		last_pos;
2123 	__u32		curr_hash;
2124 	__u32		curr_minor_hash;
2125 	__u32		next_hash;
2126 };
2127 
2128 /* calculate the first block number of the group */
2129 static inline ext4_fsblk_t
2130 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no)
2131 {
2132 	return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
2133 		le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
2134 }
2135 
2136 /*
2137  * Special error return code only used by dx_probe() and its callers.
2138  */
2139 #define ERR_BAD_DX_DIR	(-(MAX_ERRNO - 1))
2140 
2141 /* htree levels for ext4 */
2142 #define	EXT4_HTREE_LEVEL_COMPAT	2
2143 #define	EXT4_HTREE_LEVEL	3
2144 
2145 static inline int ext4_dir_htree_level(struct super_block *sb)
2146 {
2147 	return ext4_has_feature_largedir(sb) ?
2148 		EXT4_HTREE_LEVEL : EXT4_HTREE_LEVEL_COMPAT;
2149 }
2150 
2151 /*
2152  * Timeout and state flag for lazy initialization inode thread.
2153  */
2154 #define EXT4_DEF_LI_WAIT_MULT			10
2155 #define EXT4_DEF_LI_MAX_START_DELAY		5
2156 #define EXT4_LAZYINIT_QUIT			0x0001
2157 #define EXT4_LAZYINIT_RUNNING			0x0002
2158 
2159 /*
2160  * Lazy inode table initialization info
2161  */
2162 struct ext4_lazy_init {
2163 	unsigned long		li_state;
2164 	struct list_head	li_request_list;
2165 	struct mutex		li_list_mtx;
2166 };
2167 
2168 struct ext4_li_request {
2169 	struct super_block	*lr_super;
2170 	struct ext4_sb_info	*lr_sbi;
2171 	ext4_group_t		lr_next_group;
2172 	struct list_head	lr_request;
2173 	unsigned long		lr_next_sched;
2174 	unsigned long		lr_timeout;
2175 };
2176 
2177 struct ext4_features {
2178 	struct kobject f_kobj;
2179 	struct completion f_kobj_unregister;
2180 };
2181 
2182 /*
2183  * This structure will be used for multiple mount protection. It will be
2184  * written into the block number saved in the s_mmp_block field in the
2185  * superblock. Programs that check MMP should assume that if
2186  * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe
2187  * to use the filesystem, regardless of how old the timestamp is.
2188  */
2189 #define EXT4_MMP_MAGIC     0x004D4D50U /* ASCII for MMP */
2190 #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */
2191 #define EXT4_MMP_SEQ_FSCK  0xE24D4D50U /* mmp_seq value when being fscked */
2192 #define EXT4_MMP_SEQ_MAX   0xE24D4D4FU /* maximum valid mmp_seq value */
2193 
2194 struct mmp_struct {
2195 	__le32	mmp_magic;		/* Magic number for MMP */
2196 	__le32	mmp_seq;		/* Sequence no. updated periodically */
2197 
2198 	/*
2199 	 * mmp_time, mmp_nodename & mmp_bdevname are only used for information
2200 	 * purposes and do not affect the correctness of the algorithm
2201 	 */
2202 	__le64	mmp_time;		/* Time last updated */
2203 	char	mmp_nodename[64];	/* Node which last updated MMP block */
2204 	char	mmp_bdevname[32];	/* Bdev which last updated MMP block */
2205 
2206 	/*
2207 	 * mmp_check_interval is used to verify if the MMP block has been
2208 	 * updated on the block device. The value is updated based on the
2209 	 * maximum time to write the MMP block during an update cycle.
2210 	 */
2211 	__le16	mmp_check_interval;
2212 
2213 	__le16	mmp_pad1;
2214 	__le32	mmp_pad2[226];
2215 	__le32	mmp_checksum;		/* crc32c(uuid+mmp_block) */
2216 };
2217 
2218 /* arguments passed to the mmp thread */
2219 struct mmpd_data {
2220 	struct buffer_head *bh; /* bh from initial read_mmp_block() */
2221 	struct super_block *sb;  /* super block of the fs */
2222 };
2223 
2224 /*
2225  * Check interval multiplier
2226  * The MMP block is written every update interval and initially checked every
2227  * update interval x the multiplier (the value is then adapted based on the
2228  * write latency). The reason is that writes can be delayed under load and we
2229  * don't want readers to incorrectly assume that the filesystem is no longer
2230  * in use.
2231  */
2232 #define EXT4_MMP_CHECK_MULT		2UL
2233 
2234 /*
2235  * Minimum interval for MMP checking in seconds.
2236  */
2237 #define EXT4_MMP_MIN_CHECK_INTERVAL	5UL
2238 
2239 /*
2240  * Maximum interval for MMP checking in seconds.
2241  */
2242 #define EXT4_MMP_MAX_CHECK_INTERVAL	300UL
2243 
2244 /*
2245  * Function prototypes
2246  */
2247 
2248 /*
2249  * Ok, these declarations are also in <linux/kernel.h> but none of the
2250  * ext4 source programs needs to include it so they are duplicated here.
2251  */
2252 # define NORET_TYPE	/**/
2253 # define ATTRIB_NORET	__attribute__((noreturn))
2254 # define NORET_AND	noreturn,
2255 
2256 /* bitmap.c */
2257 extern unsigned int ext4_count_free(char *bitmap, unsigned numchars);
2258 void ext4_inode_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
2259 				struct ext4_group_desc *gdp,
2260 				struct buffer_head *bh, int sz);
2261 int ext4_inode_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
2262 				  struct ext4_group_desc *gdp,
2263 				  struct buffer_head *bh, int sz);
2264 void ext4_block_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
2265 				struct ext4_group_desc *gdp,
2266 				struct buffer_head *bh);
2267 int ext4_block_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
2268 				  struct ext4_group_desc *gdp,
2269 				  struct buffer_head *bh);
2270 
2271 /* balloc.c */
2272 extern void ext4_get_group_no_and_offset(struct super_block *sb,
2273 					 ext4_fsblk_t blocknr,
2274 					 ext4_group_t *blockgrpp,
2275 					 ext4_grpblk_t *offsetp);
2276 extern ext4_group_t ext4_get_group_number(struct super_block *sb,
2277 					  ext4_fsblk_t block);
2278 
2279 extern unsigned int ext4_block_group(struct super_block *sb,
2280 			ext4_fsblk_t blocknr);
2281 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb,
2282 			ext4_fsblk_t blocknr);
2283 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group);
2284 extern unsigned long ext4_bg_num_gdb(struct super_block *sb,
2285 			ext4_group_t group);
2286 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,
2287 					 ext4_fsblk_t goal,
2288 					 unsigned int flags,
2289 					 unsigned long *count,
2290 					 int *errp);
2291 extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi,
2292 				    s64 nclusters, unsigned int flags);
2293 extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *);
2294 extern void ext4_check_blocks_bitmap(struct super_block *);
2295 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
2296 						    ext4_group_t block_group,
2297 						    struct buffer_head ** bh);
2298 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
2299 
2300 extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb,
2301 						ext4_group_t block_group);
2302 extern int ext4_wait_block_bitmap(struct super_block *sb,
2303 				  ext4_group_t block_group,
2304 				  struct buffer_head *bh);
2305 extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb,
2306 						  ext4_group_t block_group);
2307 extern unsigned ext4_free_clusters_after_init(struct super_block *sb,
2308 					      ext4_group_t block_group,
2309 					      struct ext4_group_desc *gdp);
2310 ext4_fsblk_t ext4_inode_to_goal_block(struct inode *);
2311 
2312 static inline bool ext4_encrypted_inode(struct inode *inode)
2313 {
2314 	return ext4_test_inode_flag(inode, EXT4_INODE_ENCRYPT);
2315 }
2316 
2317 #ifdef CONFIG_EXT4_FS_ENCRYPTION
2318 static inline int ext4_fname_setup_filename(struct inode *dir,
2319 			const struct qstr *iname,
2320 			int lookup, struct ext4_filename *fname)
2321 {
2322 	struct fscrypt_name name;
2323 	int err;
2324 
2325 	memset(fname, 0, sizeof(struct ext4_filename));
2326 
2327 	err = fscrypt_setup_filename(dir, iname, lookup, &name);
2328 
2329 	fname->usr_fname = name.usr_fname;
2330 	fname->disk_name = name.disk_name;
2331 	fname->hinfo.hash = name.hash;
2332 	fname->hinfo.minor_hash = name.minor_hash;
2333 	fname->crypto_buf = name.crypto_buf;
2334 	return err;
2335 }
2336 
2337 static inline void ext4_fname_free_filename(struct ext4_filename *fname)
2338 {
2339 	struct fscrypt_name name;
2340 
2341 	name.crypto_buf = fname->crypto_buf;
2342 	fscrypt_free_filename(&name);
2343 
2344 	fname->crypto_buf.name = NULL;
2345 	fname->usr_fname = NULL;
2346 	fname->disk_name.name = NULL;
2347 }
2348 #else
2349 static inline int ext4_fname_setup_filename(struct inode *dir,
2350 		const struct qstr *iname,
2351 		int lookup, struct ext4_filename *fname)
2352 {
2353 	fname->usr_fname = iname;
2354 	fname->disk_name.name = (unsigned char *) iname->name;
2355 	fname->disk_name.len = iname->len;
2356 	return 0;
2357 }
2358 static inline void ext4_fname_free_filename(struct ext4_filename *fname) { }
2359 
2360 #endif
2361 
2362 /* dir.c */
2363 extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *,
2364 				  struct file *,
2365 				  struct ext4_dir_entry_2 *,
2366 				  struct buffer_head *, char *, int,
2367 				  unsigned int);
2368 #define ext4_check_dir_entry(dir, filp, de, bh, buf, size, offset)	\
2369 	unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \
2370 					(de), (bh), (buf), (size), (offset)))
2371 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
2372 				__u32 minor_hash,
2373 				struct ext4_dir_entry_2 *dirent,
2374 				struct fscrypt_str *ent_name);
2375 extern void ext4_htree_free_dir_info(struct dir_private_info *p);
2376 extern int ext4_find_dest_de(struct inode *dir, struct inode *inode,
2377 			     struct buffer_head *bh,
2378 			     void *buf, int buf_size,
2379 			     struct ext4_filename *fname,
2380 			     struct ext4_dir_entry_2 **dest_de);
2381 void ext4_insert_dentry(struct inode *inode,
2382 			struct ext4_dir_entry_2 *de,
2383 			int buf_size,
2384 			struct ext4_filename *fname);
2385 static inline void ext4_update_dx_flag(struct inode *inode)
2386 {
2387 	if (!ext4_has_feature_dir_index(inode->i_sb))
2388 		ext4_clear_inode_flag(inode, EXT4_INODE_INDEX);
2389 }
2390 static const unsigned char ext4_filetype_table[] = {
2391 	DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK
2392 };
2393 
2394 static inline  unsigned char get_dtype(struct super_block *sb, int filetype)
2395 {
2396 	if (!ext4_has_feature_filetype(sb) || filetype >= EXT4_FT_MAX)
2397 		return DT_UNKNOWN;
2398 
2399 	return ext4_filetype_table[filetype];
2400 }
2401 extern int ext4_check_all_de(struct inode *dir, struct buffer_head *bh,
2402 			     void *buf, int buf_size);
2403 
2404 /* fsync.c */
2405 extern int ext4_sync_file(struct file *, loff_t, loff_t, int);
2406 
2407 /* hash.c */
2408 extern int ext4fs_dirhash(const char *name, int len, struct
2409 			  dx_hash_info *hinfo);
2410 
2411 /* ialloc.c */
2412 extern struct inode *__ext4_new_inode(handle_t *, struct inode *, umode_t,
2413 				      const struct qstr *qstr, __u32 goal,
2414 				      uid_t *owner, __u32 i_flags,
2415 				      int handle_type, unsigned int line_no,
2416 				      int nblocks);
2417 
2418 #define ext4_new_inode(handle, dir, mode, qstr, goal, owner, i_flags) \
2419 	__ext4_new_inode((handle), (dir), (mode), (qstr), (goal), (owner), \
2420 			 i_flags, 0, 0, 0)
2421 #define ext4_new_inode_start_handle(dir, mode, qstr, goal, owner, \
2422 				    type, nblocks)		    \
2423 	__ext4_new_inode(NULL, (dir), (mode), (qstr), (goal), (owner), \
2424 			 0, (type), __LINE__, (nblocks))
2425 
2426 
2427 extern void ext4_free_inode(handle_t *, struct inode *);
2428 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long);
2429 extern unsigned long ext4_count_free_inodes(struct super_block *);
2430 extern unsigned long ext4_count_dirs(struct super_block *);
2431 extern void ext4_check_inodes_bitmap(struct super_block *);
2432 extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap);
2433 extern int ext4_init_inode_table(struct super_block *sb,
2434 				 ext4_group_t group, int barrier);
2435 extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate);
2436 
2437 /* mballoc.c */
2438 extern const struct file_operations ext4_seq_mb_groups_fops;
2439 extern long ext4_mb_stats;
2440 extern long ext4_mb_max_to_scan;
2441 extern int ext4_mb_init(struct super_block *);
2442 extern int ext4_mb_release(struct super_block *);
2443 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *,
2444 				struct ext4_allocation_request *, int *);
2445 extern int ext4_mb_reserve_blocks(struct super_block *, int);
2446 extern void ext4_discard_preallocations(struct inode *);
2447 extern int __init ext4_init_mballoc(void);
2448 extern void ext4_exit_mballoc(void);
2449 extern void ext4_free_blocks(handle_t *handle, struct inode *inode,
2450 			     struct buffer_head *bh, ext4_fsblk_t block,
2451 			     unsigned long count, int flags);
2452 extern int ext4_mb_alloc_groupinfo(struct super_block *sb,
2453 				   ext4_group_t ngroups);
2454 extern int ext4_mb_add_groupinfo(struct super_block *sb,
2455 		ext4_group_t i, struct ext4_group_desc *desc);
2456 extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb,
2457 				ext4_fsblk_t block, unsigned long count);
2458 extern int ext4_trim_fs(struct super_block *, struct fstrim_range *);
2459 extern void ext4_process_freed_data(struct super_block *sb, tid_t commit_tid);
2460 
2461 /* inode.c */
2462 int ext4_inode_is_fast_symlink(struct inode *inode);
2463 struct buffer_head *ext4_getblk(handle_t *, struct inode *, ext4_lblk_t, int);
2464 struct buffer_head *ext4_bread(handle_t *, struct inode *, ext4_lblk_t, int);
2465 int ext4_bread_batch(struct inode *inode, ext4_lblk_t block, int bh_count,
2466 		     bool wait, struct buffer_head **bhs);
2467 int ext4_get_block_unwritten(struct inode *inode, sector_t iblock,
2468 			     struct buffer_head *bh_result, int create);
2469 int ext4_get_block(struct inode *inode, sector_t iblock,
2470 		   struct buffer_head *bh_result, int create);
2471 int ext4_dio_get_block(struct inode *inode, sector_t iblock,
2472 		       struct buffer_head *bh_result, int create);
2473 int ext4_da_get_block_prep(struct inode *inode, sector_t iblock,
2474 			   struct buffer_head *bh, int create);
2475 int ext4_walk_page_buffers(handle_t *handle,
2476 			   struct buffer_head *head,
2477 			   unsigned from,
2478 			   unsigned to,
2479 			   int *partial,
2480 			   int (*fn)(handle_t *handle,
2481 				     struct buffer_head *bh));
2482 int do_journal_get_write_access(handle_t *handle,
2483 				struct buffer_head *bh);
2484 #define FALL_BACK_TO_NONDELALLOC 1
2485 #define CONVERT_INLINE_DATA	 2
2486 
2487 extern struct inode *ext4_iget(struct super_block *, unsigned long);
2488 extern struct inode *ext4_iget_normal(struct super_block *, unsigned long);
2489 extern int  ext4_write_inode(struct inode *, struct writeback_control *);
2490 extern int  ext4_setattr(struct dentry *, struct iattr *);
2491 extern int  ext4_getattr(const struct path *, struct kstat *, u32, unsigned int);
2492 extern void ext4_evict_inode(struct inode *);
2493 extern void ext4_clear_inode(struct inode *);
2494 extern int  ext4_file_getattr(const struct path *, struct kstat *, u32, unsigned int);
2495 extern int  ext4_sync_inode(handle_t *, struct inode *);
2496 extern void ext4_dirty_inode(struct inode *, int);
2497 extern int ext4_change_inode_journal_flag(struct inode *, int);
2498 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
2499 extern int ext4_inode_attach_jinode(struct inode *inode);
2500 extern int ext4_can_truncate(struct inode *inode);
2501 extern int ext4_truncate(struct inode *);
2502 extern int ext4_punch_hole(struct inode *inode, loff_t offset, loff_t length);
2503 extern int ext4_truncate_restart_trans(handle_t *, struct inode *, int nblocks);
2504 extern void ext4_set_inode_flags(struct inode *);
2505 extern int ext4_alloc_da_blocks(struct inode *inode);
2506 extern void ext4_set_aops(struct inode *inode);
2507 extern int ext4_writepage_trans_blocks(struct inode *);
2508 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks);
2509 extern int ext4_zero_partial_blocks(handle_t *handle, struct inode *inode,
2510 			     loff_t lstart, loff_t lend);
2511 extern int ext4_page_mkwrite(struct vm_fault *vmf);
2512 extern int ext4_filemap_fault(struct vm_fault *vmf);
2513 extern qsize_t *ext4_get_reserved_space(struct inode *inode);
2514 extern int ext4_get_projid(struct inode *inode, kprojid_t *projid);
2515 extern void ext4_da_update_reserve_space(struct inode *inode,
2516 					int used, int quota_claim);
2517 extern int ext4_issue_zeroout(struct inode *inode, ext4_lblk_t lblk,
2518 			      ext4_fsblk_t pblk, ext4_lblk_t len);
2519 extern int ext4_get_next_extent(struct inode *inode, ext4_lblk_t lblk,
2520 				unsigned int map_len,
2521 				struct extent_status *result);
2522 
2523 /* indirect.c */
2524 extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode,
2525 				struct ext4_map_blocks *map, int flags);
2526 extern int ext4_ind_calc_metadata_amount(struct inode *inode, sector_t lblock);
2527 extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks);
2528 extern void ext4_ind_truncate(handle_t *, struct inode *inode);
2529 extern int ext4_ind_remove_space(handle_t *handle, struct inode *inode,
2530 				 ext4_lblk_t start, ext4_lblk_t end);
2531 
2532 /* ioctl.c */
2533 extern long ext4_ioctl(struct file *, unsigned int, unsigned long);
2534 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long);
2535 
2536 /* migrate.c */
2537 extern int ext4_ext_migrate(struct inode *);
2538 extern int ext4_ind_migrate(struct inode *inode);
2539 
2540 /* namei.c */
2541 extern int ext4_dirent_csum_verify(struct inode *inode,
2542 				   struct ext4_dir_entry *dirent);
2543 extern int ext4_orphan_add(handle_t *, struct inode *);
2544 extern int ext4_orphan_del(handle_t *, struct inode *);
2545 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
2546 				__u32 start_minor_hash, __u32 *next_hash);
2547 extern int ext4_search_dir(struct buffer_head *bh,
2548 			   char *search_buf,
2549 			   int buf_size,
2550 			   struct inode *dir,
2551 			   struct ext4_filename *fname,
2552 			   unsigned int offset,
2553 			   struct ext4_dir_entry_2 **res_dir);
2554 extern int ext4_generic_delete_entry(handle_t *handle,
2555 				     struct inode *dir,
2556 				     struct ext4_dir_entry_2 *de_del,
2557 				     struct buffer_head *bh,
2558 				     void *entry_buf,
2559 				     int buf_size,
2560 				     int csum_size);
2561 extern bool ext4_empty_dir(struct inode *inode);
2562 
2563 /* resize.c */
2564 extern int ext4_group_add(struct super_block *sb,
2565 				struct ext4_new_group_data *input);
2566 extern int ext4_group_extend(struct super_block *sb,
2567 				struct ext4_super_block *es,
2568 				ext4_fsblk_t n_blocks_count);
2569 extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count);
2570 
2571 /* super.c */
2572 extern int ext4_seq_options_show(struct seq_file *seq, void *offset);
2573 extern int ext4_calculate_overhead(struct super_block *sb);
2574 extern void ext4_superblock_csum_set(struct super_block *sb);
2575 extern void *ext4_kvmalloc(size_t size, gfp_t flags);
2576 extern void *ext4_kvzalloc(size_t size, gfp_t flags);
2577 extern int ext4_alloc_flex_bg_array(struct super_block *sb,
2578 				    ext4_group_t ngroup);
2579 extern const char *ext4_decode_error(struct super_block *sb, int errno,
2580 				     char nbuf[16]);
2581 
2582 extern __printf(4, 5)
2583 void __ext4_error(struct super_block *, const char *, unsigned int,
2584 		  const char *, ...);
2585 extern __printf(5, 6)
2586 void __ext4_error_inode(struct inode *, const char *, unsigned int, ext4_fsblk_t,
2587 		      const char *, ...);
2588 extern __printf(5, 6)
2589 void __ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t,
2590 		     const char *, ...);
2591 extern void __ext4_std_error(struct super_block *, const char *,
2592 			     unsigned int, int);
2593 extern __printf(4, 5)
2594 void __ext4_abort(struct super_block *, const char *, unsigned int,
2595 		  const char *, ...);
2596 extern __printf(4, 5)
2597 void __ext4_warning(struct super_block *, const char *, unsigned int,
2598 		    const char *, ...);
2599 extern __printf(4, 5)
2600 void __ext4_warning_inode(const struct inode *inode, const char *function,
2601 			  unsigned int line, const char *fmt, ...);
2602 extern __printf(3, 4)
2603 void __ext4_msg(struct super_block *, const char *, const char *, ...);
2604 extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp,
2605 			   const char *, unsigned int, const char *);
2606 extern __printf(7, 8)
2607 void __ext4_grp_locked_error(const char *, unsigned int,
2608 			     struct super_block *, ext4_group_t,
2609 			     unsigned long, ext4_fsblk_t,
2610 			     const char *, ...);
2611 
2612 #define EXT4_ERROR_INODE(inode, fmt, a...) \
2613 	ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a)
2614 
2615 #define EXT4_ERROR_INODE_BLOCK(inode, block, fmt, a...)			\
2616 	ext4_error_inode((inode), __func__, __LINE__, (block), (fmt), ## a)
2617 
2618 #define EXT4_ERROR_FILE(file, block, fmt, a...)				\
2619 	ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a)
2620 
2621 #ifdef CONFIG_PRINTK
2622 
2623 #define ext4_error_inode(inode, func, line, block, fmt, ...)		\
2624 	__ext4_error_inode(inode, func, line, block, fmt, ##__VA_ARGS__)
2625 #define ext4_error_file(file, func, line, block, fmt, ...)		\
2626 	__ext4_error_file(file, func, line, block, fmt, ##__VA_ARGS__)
2627 #define ext4_error(sb, fmt, ...)					\
2628 	__ext4_error(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
2629 #define ext4_abort(sb, fmt, ...)					\
2630 	__ext4_abort(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
2631 #define ext4_warning(sb, fmt, ...)					\
2632 	__ext4_warning(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
2633 #define ext4_warning_inode(inode, fmt, ...)				\
2634 	__ext4_warning_inode(inode, __func__, __LINE__, fmt, ##__VA_ARGS__)
2635 #define ext4_msg(sb, level, fmt, ...)				\
2636 	__ext4_msg(sb, level, fmt, ##__VA_ARGS__)
2637 #define dump_mmp_msg(sb, mmp, msg)					\
2638 	__dump_mmp_msg(sb, mmp, __func__, __LINE__, msg)
2639 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...)		\
2640 	__ext4_grp_locked_error(__func__, __LINE__, sb, grp, ino, block, \
2641 				fmt, ##__VA_ARGS__)
2642 
2643 #else
2644 
2645 #define ext4_error_inode(inode, func, line, block, fmt, ...)		\
2646 do {									\
2647 	no_printk(fmt, ##__VA_ARGS__);					\
2648 	__ext4_error_inode(inode, "", 0, block, " ");			\
2649 } while (0)
2650 #define ext4_error_file(file, func, line, block, fmt, ...)		\
2651 do {									\
2652 	no_printk(fmt, ##__VA_ARGS__);					\
2653 	__ext4_error_file(file, "", 0, block, " ");			\
2654 } while (0)
2655 #define ext4_error(sb, fmt, ...)					\
2656 do {									\
2657 	no_printk(fmt, ##__VA_ARGS__);					\
2658 	__ext4_error(sb, "", 0, " ");					\
2659 } while (0)
2660 #define ext4_abort(sb, fmt, ...)					\
2661 do {									\
2662 	no_printk(fmt, ##__VA_ARGS__);					\
2663 	__ext4_abort(sb, "", 0, " ");					\
2664 } while (0)
2665 #define ext4_warning(sb, fmt, ...)					\
2666 do {									\
2667 	no_printk(fmt, ##__VA_ARGS__);					\
2668 	__ext4_warning(sb, "", 0, " ");					\
2669 } while (0)
2670 #define ext4_warning_inode(inode, fmt, ...)				\
2671 do {									\
2672 	no_printk(fmt, ##__VA_ARGS__);					\
2673 	__ext4_warning_inode(inode, "", 0, " ");			\
2674 } while (0)
2675 #define ext4_msg(sb, level, fmt, ...)					\
2676 do {									\
2677 	no_printk(fmt, ##__VA_ARGS__);					\
2678 	__ext4_msg(sb, "", " ");					\
2679 } while (0)
2680 #define dump_mmp_msg(sb, mmp, msg)					\
2681 	__dump_mmp_msg(sb, mmp, "", 0, "")
2682 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...)		\
2683 do {									\
2684 	no_printk(fmt, ##__VA_ARGS__);				\
2685 	__ext4_grp_locked_error("", 0, sb, grp, ino, block, " ");	\
2686 } while (0)
2687 
2688 #endif
2689 
2690 extern void ext4_update_dynamic_rev(struct super_block *sb);
2691 extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb,
2692 					__u32 compat);
2693 extern int ext4_update_rocompat_feature(handle_t *handle,
2694 					struct super_block *sb,	__u32 rocompat);
2695 extern int ext4_update_incompat_feature(handle_t *handle,
2696 					struct super_block *sb,	__u32 incompat);
2697 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
2698 				      struct ext4_group_desc *bg);
2699 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
2700 				      struct ext4_group_desc *bg);
2701 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
2702 				     struct ext4_group_desc *bg);
2703 extern __u32 ext4_free_group_clusters(struct super_block *sb,
2704 				      struct ext4_group_desc *bg);
2705 extern __u32 ext4_free_inodes_count(struct super_block *sb,
2706 				 struct ext4_group_desc *bg);
2707 extern __u32 ext4_used_dirs_count(struct super_block *sb,
2708 				struct ext4_group_desc *bg);
2709 extern __u32 ext4_itable_unused_count(struct super_block *sb,
2710 				   struct ext4_group_desc *bg);
2711 extern void ext4_block_bitmap_set(struct super_block *sb,
2712 				  struct ext4_group_desc *bg, ext4_fsblk_t blk);
2713 extern void ext4_inode_bitmap_set(struct super_block *sb,
2714 				  struct ext4_group_desc *bg, ext4_fsblk_t blk);
2715 extern void ext4_inode_table_set(struct super_block *sb,
2716 				 struct ext4_group_desc *bg, ext4_fsblk_t blk);
2717 extern void ext4_free_group_clusters_set(struct super_block *sb,
2718 					 struct ext4_group_desc *bg,
2719 					 __u32 count);
2720 extern void ext4_free_inodes_set(struct super_block *sb,
2721 				struct ext4_group_desc *bg, __u32 count);
2722 extern void ext4_used_dirs_set(struct super_block *sb,
2723 				struct ext4_group_desc *bg, __u32 count);
2724 extern void ext4_itable_unused_set(struct super_block *sb,
2725 				   struct ext4_group_desc *bg, __u32 count);
2726 extern int ext4_group_desc_csum_verify(struct super_block *sb, __u32 group,
2727 				       struct ext4_group_desc *gdp);
2728 extern void ext4_group_desc_csum_set(struct super_block *sb, __u32 group,
2729 				     struct ext4_group_desc *gdp);
2730 extern int ext4_register_li_request(struct super_block *sb,
2731 				    ext4_group_t first_not_zeroed);
2732 
2733 static inline int ext4_has_metadata_csum(struct super_block *sb)
2734 {
2735 	WARN_ON_ONCE(ext4_has_feature_metadata_csum(sb) &&
2736 		     !EXT4_SB(sb)->s_chksum_driver);
2737 
2738 	return ext4_has_feature_metadata_csum(sb) &&
2739 	       (EXT4_SB(sb)->s_chksum_driver != NULL);
2740 }
2741 
2742 static inline int ext4_has_group_desc_csum(struct super_block *sb)
2743 {
2744 	return ext4_has_feature_gdt_csum(sb) || ext4_has_metadata_csum(sb);
2745 }
2746 
2747 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
2748 {
2749 	return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) |
2750 		le32_to_cpu(es->s_blocks_count_lo);
2751 }
2752 
2753 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
2754 {
2755 	return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) |
2756 		le32_to_cpu(es->s_r_blocks_count_lo);
2757 }
2758 
2759 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
2760 {
2761 	return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) |
2762 		le32_to_cpu(es->s_free_blocks_count_lo);
2763 }
2764 
2765 static inline void ext4_blocks_count_set(struct ext4_super_block *es,
2766 					 ext4_fsblk_t blk)
2767 {
2768 	es->s_blocks_count_lo = cpu_to_le32((u32)blk);
2769 	es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
2770 }
2771 
2772 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
2773 					      ext4_fsblk_t blk)
2774 {
2775 	es->s_free_blocks_count_lo = cpu_to_le32((u32)blk);
2776 	es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
2777 }
2778 
2779 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
2780 					   ext4_fsblk_t blk)
2781 {
2782 	es->s_r_blocks_count_lo = cpu_to_le32((u32)blk);
2783 	es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
2784 }
2785 
2786 static inline loff_t ext4_isize(struct super_block *sb,
2787 				struct ext4_inode *raw_inode)
2788 {
2789 	if (ext4_has_feature_largedir(sb) ||
2790 	    S_ISREG(le16_to_cpu(raw_inode->i_mode)))
2791 		return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) |
2792 			le32_to_cpu(raw_inode->i_size_lo);
2793 
2794 	return (loff_t) le32_to_cpu(raw_inode->i_size_lo);
2795 }
2796 
2797 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size)
2798 {
2799 	raw_inode->i_size_lo = cpu_to_le32(i_size);
2800 	raw_inode->i_size_high = cpu_to_le32(i_size >> 32);
2801 }
2802 
2803 static inline
2804 struct ext4_group_info *ext4_get_group_info(struct super_block *sb,
2805 					    ext4_group_t group)
2806 {
2807 	 struct ext4_group_info ***grp_info;
2808 	 long indexv, indexh;
2809 	 BUG_ON(group >= EXT4_SB(sb)->s_groups_count);
2810 	 grp_info = EXT4_SB(sb)->s_group_info;
2811 	 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb));
2812 	 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1);
2813 	 return grp_info[indexv][indexh];
2814 }
2815 
2816 /*
2817  * Reading s_groups_count requires using smp_rmb() afterwards.  See
2818  * the locking protocol documented in the comments of ext4_group_add()
2819  * in resize.c
2820  */
2821 static inline ext4_group_t ext4_get_groups_count(struct super_block *sb)
2822 {
2823 	ext4_group_t	ngroups = EXT4_SB(sb)->s_groups_count;
2824 
2825 	smp_rmb();
2826 	return ngroups;
2827 }
2828 
2829 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi,
2830 					     ext4_group_t block_group)
2831 {
2832 	return block_group >> sbi->s_log_groups_per_flex;
2833 }
2834 
2835 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi)
2836 {
2837 	return 1 << sbi->s_log_groups_per_flex;
2838 }
2839 
2840 #define ext4_std_error(sb, errno)				\
2841 do {								\
2842 	if ((errno))						\
2843 		__ext4_std_error((sb), __func__, __LINE__, (errno));	\
2844 } while (0)
2845 
2846 #ifdef CONFIG_SMP
2847 /* Each CPU can accumulate percpu_counter_batch clusters in their local
2848  * counters. So we need to make sure we have free clusters more
2849  * than percpu_counter_batch  * nr_cpu_ids. Also add a window of 4 times.
2850  */
2851 #define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids))
2852 #else
2853 #define EXT4_FREECLUSTERS_WATERMARK 0
2854 #endif
2855 
2856 /* Update i_disksize. Requires i_mutex to avoid races with truncate */
2857 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize)
2858 {
2859 	WARN_ON_ONCE(S_ISREG(inode->i_mode) &&
2860 		     !inode_is_locked(inode));
2861 	down_write(&EXT4_I(inode)->i_data_sem);
2862 	if (newsize > EXT4_I(inode)->i_disksize)
2863 		EXT4_I(inode)->i_disksize = newsize;
2864 	up_write(&EXT4_I(inode)->i_data_sem);
2865 }
2866 
2867 /* Update i_size, i_disksize. Requires i_mutex to avoid races with truncate */
2868 static inline int ext4_update_inode_size(struct inode *inode, loff_t newsize)
2869 {
2870 	int changed = 0;
2871 
2872 	if (newsize > inode->i_size) {
2873 		i_size_write(inode, newsize);
2874 		changed = 1;
2875 	}
2876 	if (newsize > EXT4_I(inode)->i_disksize) {
2877 		ext4_update_i_disksize(inode, newsize);
2878 		changed |= 2;
2879 	}
2880 	return changed;
2881 }
2882 
2883 int ext4_update_disksize_before_punch(struct inode *inode, loff_t offset,
2884 				      loff_t len);
2885 
2886 struct ext4_group_info {
2887 	unsigned long   bb_state;
2888 	struct rb_root  bb_free_root;
2889 	ext4_grpblk_t	bb_first_free;	/* first free block */
2890 	ext4_grpblk_t	bb_free;	/* total free blocks */
2891 	ext4_grpblk_t	bb_fragments;	/* nr of freespace fragments */
2892 	ext4_grpblk_t	bb_largest_free_order;/* order of largest frag in BG */
2893 	struct          list_head bb_prealloc_list;
2894 #ifdef DOUBLE_CHECK
2895 	void            *bb_bitmap;
2896 #endif
2897 	struct rw_semaphore alloc_sem;
2898 	ext4_grpblk_t	bb_counters[];	/* Nr of free power-of-two-block
2899 					 * regions, index is order.
2900 					 * bb_counters[3] = 5 means
2901 					 * 5 free 8-block regions. */
2902 };
2903 
2904 #define EXT4_GROUP_INFO_NEED_INIT_BIT		0
2905 #define EXT4_GROUP_INFO_WAS_TRIMMED_BIT		1
2906 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT	2
2907 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT	3
2908 
2909 #define EXT4_MB_GRP_NEED_INIT(grp)	\
2910 	(test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state)))
2911 #define EXT4_MB_GRP_BBITMAP_CORRUPT(grp)	\
2912 	(test_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &((grp)->bb_state)))
2913 #define EXT4_MB_GRP_IBITMAP_CORRUPT(grp)	\
2914 	(test_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &((grp)->bb_state)))
2915 
2916 #define EXT4_MB_GRP_WAS_TRIMMED(grp)	\
2917 	(test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2918 #define EXT4_MB_GRP_SET_TRIMMED(grp)	\
2919 	(set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2920 #define EXT4_MB_GRP_CLEAR_TRIMMED(grp)	\
2921 	(clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2922 
2923 #define EXT4_MAX_CONTENTION		8
2924 #define EXT4_CONTENTION_THRESHOLD	2
2925 
2926 static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb,
2927 					      ext4_group_t group)
2928 {
2929 	return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group);
2930 }
2931 
2932 /*
2933  * Returns true if the filesystem is busy enough that attempts to
2934  * access the block group locks has run into contention.
2935  */
2936 static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi)
2937 {
2938 	return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD);
2939 }
2940 
2941 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group)
2942 {
2943 	spinlock_t *lock = ext4_group_lock_ptr(sb, group);
2944 	if (spin_trylock(lock))
2945 		/*
2946 		 * We're able to grab the lock right away, so drop the
2947 		 * lock contention counter.
2948 		 */
2949 		atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0);
2950 	else {
2951 		/*
2952 		 * The lock is busy, so bump the contention counter,
2953 		 * and then wait on the spin lock.
2954 		 */
2955 		atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1,
2956 				  EXT4_MAX_CONTENTION);
2957 		spin_lock(lock);
2958 	}
2959 }
2960 
2961 static inline void ext4_unlock_group(struct super_block *sb,
2962 					ext4_group_t group)
2963 {
2964 	spin_unlock(ext4_group_lock_ptr(sb, group));
2965 }
2966 
2967 /*
2968  * Block validity checking
2969  */
2970 #define ext4_check_indirect_blockref(inode, bh)				\
2971 	ext4_check_blockref(__func__, __LINE__, inode,			\
2972 			    (__le32 *)(bh)->b_data,			\
2973 			    EXT4_ADDR_PER_BLOCK((inode)->i_sb))
2974 
2975 #define ext4_ind_check_inode(inode)					\
2976 	ext4_check_blockref(__func__, __LINE__, inode,			\
2977 			    EXT4_I(inode)->i_data,			\
2978 			    EXT4_NDIR_BLOCKS)
2979 
2980 /*
2981  * Inodes and files operations
2982  */
2983 
2984 /* dir.c */
2985 extern const struct file_operations ext4_dir_operations;
2986 
2987 /* file.c */
2988 extern const struct inode_operations ext4_file_inode_operations;
2989 extern const struct file_operations ext4_file_operations;
2990 extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin);
2991 
2992 /* inline.c */
2993 extern int ext4_get_max_inline_size(struct inode *inode);
2994 extern int ext4_find_inline_data_nolock(struct inode *inode);
2995 extern int ext4_init_inline_data(handle_t *handle, struct inode *inode,
2996 				 unsigned int len);
2997 extern int ext4_destroy_inline_data(handle_t *handle, struct inode *inode);
2998 
2999 extern int ext4_readpage_inline(struct inode *inode, struct page *page);
3000 extern int ext4_try_to_write_inline_data(struct address_space *mapping,
3001 					 struct inode *inode,
3002 					 loff_t pos, unsigned len,
3003 					 unsigned flags,
3004 					 struct page **pagep);
3005 extern int ext4_write_inline_data_end(struct inode *inode,
3006 				      loff_t pos, unsigned len,
3007 				      unsigned copied,
3008 				      struct page *page);
3009 extern struct buffer_head *
3010 ext4_journalled_write_inline_data(struct inode *inode,
3011 				  unsigned len,
3012 				  struct page *page);
3013 extern int ext4_da_write_inline_data_begin(struct address_space *mapping,
3014 					   struct inode *inode,
3015 					   loff_t pos, unsigned len,
3016 					   unsigned flags,
3017 					   struct page **pagep,
3018 					   void **fsdata);
3019 extern int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos,
3020 					 unsigned len, unsigned copied,
3021 					 struct page *page);
3022 extern int ext4_try_add_inline_entry(handle_t *handle,
3023 				     struct ext4_filename *fname,
3024 				     struct inode *dir, struct inode *inode);
3025 extern int ext4_try_create_inline_dir(handle_t *handle,
3026 				      struct inode *parent,
3027 				      struct inode *inode);
3028 extern int ext4_read_inline_dir(struct file *filp,
3029 				struct dir_context *ctx,
3030 				int *has_inline_data);
3031 extern int htree_inlinedir_to_tree(struct file *dir_file,
3032 				   struct inode *dir, ext4_lblk_t block,
3033 				   struct dx_hash_info *hinfo,
3034 				   __u32 start_hash, __u32 start_minor_hash,
3035 				   int *has_inline_data);
3036 extern struct buffer_head *ext4_find_inline_entry(struct inode *dir,
3037 					struct ext4_filename *fname,
3038 					struct ext4_dir_entry_2 **res_dir,
3039 					int *has_inline_data);
3040 extern int ext4_delete_inline_entry(handle_t *handle,
3041 				    struct inode *dir,
3042 				    struct ext4_dir_entry_2 *de_del,
3043 				    struct buffer_head *bh,
3044 				    int *has_inline_data);
3045 extern bool empty_inline_dir(struct inode *dir, int *has_inline_data);
3046 extern struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
3047 					struct ext4_dir_entry_2 **parent_de,
3048 					int *retval);
3049 extern int ext4_inline_data_fiemap(struct inode *inode,
3050 				   struct fiemap_extent_info *fieinfo,
3051 				   int *has_inline, __u64 start, __u64 len);
3052 extern int ext4_try_to_evict_inline_data(handle_t *handle,
3053 					 struct inode *inode,
3054 					 int needed);
3055 extern int ext4_inline_data_truncate(struct inode *inode, int *has_inline);
3056 
3057 extern int ext4_convert_inline_data(struct inode *inode);
3058 
3059 static inline int ext4_has_inline_data(struct inode *inode)
3060 {
3061 	return ext4_test_inode_flag(inode, EXT4_INODE_INLINE_DATA) &&
3062 	       EXT4_I(inode)->i_inline_off;
3063 }
3064 
3065 /* namei.c */
3066 extern const struct inode_operations ext4_dir_inode_operations;
3067 extern const struct inode_operations ext4_special_inode_operations;
3068 extern struct dentry *ext4_get_parent(struct dentry *child);
3069 extern struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode,
3070 				 struct ext4_dir_entry_2 *de,
3071 				 int blocksize, int csum_size,
3072 				 unsigned int parent_ino, int dotdot_real_len);
3073 extern void initialize_dirent_tail(struct ext4_dir_entry_tail *t,
3074 				   unsigned int blocksize);
3075 extern int ext4_handle_dirty_dirent_node(handle_t *handle,
3076 					 struct inode *inode,
3077 					 struct buffer_head *bh);
3078 #define S_SHIFT 12
3079 static const unsigned char ext4_type_by_mode[(S_IFMT >> S_SHIFT) + 1] = {
3080 	[S_IFREG >> S_SHIFT]	= EXT4_FT_REG_FILE,
3081 	[S_IFDIR >> S_SHIFT]	= EXT4_FT_DIR,
3082 	[S_IFCHR >> S_SHIFT]	= EXT4_FT_CHRDEV,
3083 	[S_IFBLK >> S_SHIFT]	= EXT4_FT_BLKDEV,
3084 	[S_IFIFO >> S_SHIFT]	= EXT4_FT_FIFO,
3085 	[S_IFSOCK >> S_SHIFT]	= EXT4_FT_SOCK,
3086 	[S_IFLNK >> S_SHIFT]	= EXT4_FT_SYMLINK,
3087 };
3088 
3089 static inline void ext4_set_de_type(struct super_block *sb,
3090 				struct ext4_dir_entry_2 *de,
3091 				umode_t mode) {
3092 	if (ext4_has_feature_filetype(sb))
3093 		de->file_type = ext4_type_by_mode[(mode & S_IFMT)>>S_SHIFT];
3094 }
3095 
3096 /* readpages.c */
3097 extern int ext4_mpage_readpages(struct address_space *mapping,
3098 				struct list_head *pages, struct page *page,
3099 				unsigned nr_pages);
3100 
3101 /* symlink.c */
3102 extern const struct inode_operations ext4_encrypted_symlink_inode_operations;
3103 extern const struct inode_operations ext4_symlink_inode_operations;
3104 extern const struct inode_operations ext4_fast_symlink_inode_operations;
3105 
3106 /* sysfs.c */
3107 extern int ext4_register_sysfs(struct super_block *sb);
3108 extern void ext4_unregister_sysfs(struct super_block *sb);
3109 extern int __init ext4_init_sysfs(void);
3110 extern void ext4_exit_sysfs(void);
3111 
3112 /* block_validity */
3113 extern void ext4_release_system_zone(struct super_block *sb);
3114 extern int ext4_setup_system_zone(struct super_block *sb);
3115 extern int __init ext4_init_system_zone(void);
3116 extern void ext4_exit_system_zone(void);
3117 extern int ext4_data_block_valid(struct ext4_sb_info *sbi,
3118 				 ext4_fsblk_t start_blk,
3119 				 unsigned int count);
3120 extern int ext4_check_blockref(const char *, unsigned int,
3121 			       struct inode *, __le32 *, unsigned int);
3122 
3123 /* extents.c */
3124 struct ext4_ext_path;
3125 struct ext4_extent;
3126 
3127 /*
3128  * Maximum number of logical blocks in a file; ext4_extent's ee_block is
3129  * __le32.
3130  */
3131 #define EXT_MAX_BLOCKS	0xffffffff
3132 
3133 extern int ext4_ext_tree_init(handle_t *handle, struct inode *);
3134 extern int ext4_ext_writepage_trans_blocks(struct inode *, int);
3135 extern int ext4_ext_index_trans_blocks(struct inode *inode, int extents);
3136 extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
3137 			       struct ext4_map_blocks *map, int flags);
3138 extern int ext4_ext_truncate(handle_t *, struct inode *);
3139 extern int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start,
3140 				 ext4_lblk_t end);
3141 extern void ext4_ext_init(struct super_block *);
3142 extern void ext4_ext_release(struct super_block *);
3143 extern long ext4_fallocate(struct file *file, int mode, loff_t offset,
3144 			  loff_t len);
3145 extern int ext4_convert_unwritten_extents(handle_t *handle, struct inode *inode,
3146 					  loff_t offset, ssize_t len);
3147 extern int ext4_map_blocks(handle_t *handle, struct inode *inode,
3148 			   struct ext4_map_blocks *map, int flags);
3149 extern int ext4_ext_calc_metadata_amount(struct inode *inode,
3150 					 ext4_lblk_t lblocks);
3151 extern int ext4_ext_calc_credits_for_single_extent(struct inode *inode,
3152 						   int num,
3153 						   struct ext4_ext_path *path);
3154 extern int ext4_can_extents_be_merged(struct inode *inode,
3155 				      struct ext4_extent *ex1,
3156 				      struct ext4_extent *ex2);
3157 extern int ext4_ext_insert_extent(handle_t *, struct inode *,
3158 				  struct ext4_ext_path **,
3159 				  struct ext4_extent *, int);
3160 extern struct ext4_ext_path *ext4_find_extent(struct inode *, ext4_lblk_t,
3161 					      struct ext4_ext_path **,
3162 					      int flags);
3163 extern void ext4_ext_drop_refs(struct ext4_ext_path *);
3164 extern int ext4_ext_check_inode(struct inode *inode);
3165 extern int ext4_find_delalloc_range(struct inode *inode,
3166 				    ext4_lblk_t lblk_start,
3167 				    ext4_lblk_t lblk_end);
3168 extern int ext4_find_delalloc_cluster(struct inode *inode, ext4_lblk_t lblk);
3169 extern ext4_lblk_t ext4_ext_next_allocated_block(struct ext4_ext_path *path);
3170 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
3171 			__u64 start, __u64 len);
3172 extern int ext4_ext_precache(struct inode *inode);
3173 extern int ext4_collapse_range(struct inode *inode, loff_t offset, loff_t len);
3174 extern int ext4_insert_range(struct inode *inode, loff_t offset, loff_t len);
3175 extern int ext4_swap_extents(handle_t *handle, struct inode *inode1,
3176 				struct inode *inode2, ext4_lblk_t lblk1,
3177 			     ext4_lblk_t lblk2,  ext4_lblk_t count,
3178 			     int mark_unwritten,int *err);
3179 
3180 /* move_extent.c */
3181 extern void ext4_double_down_write_data_sem(struct inode *first,
3182 					    struct inode *second);
3183 extern void ext4_double_up_write_data_sem(struct inode *orig_inode,
3184 					  struct inode *donor_inode);
3185 extern int ext4_move_extents(struct file *o_filp, struct file *d_filp,
3186 			     __u64 start_orig, __u64 start_donor,
3187 			     __u64 len, __u64 *moved_len);
3188 
3189 /* page-io.c */
3190 extern int __init ext4_init_pageio(void);
3191 extern void ext4_exit_pageio(void);
3192 extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags);
3193 extern ext4_io_end_t *ext4_get_io_end(ext4_io_end_t *io_end);
3194 extern int ext4_put_io_end(ext4_io_end_t *io_end);
3195 extern void ext4_put_io_end_defer(ext4_io_end_t *io_end);
3196 extern void ext4_io_submit_init(struct ext4_io_submit *io,
3197 				struct writeback_control *wbc);
3198 extern void ext4_end_io_rsv_work(struct work_struct *work);
3199 extern void ext4_io_submit(struct ext4_io_submit *io);
3200 extern int ext4_bio_write_page(struct ext4_io_submit *io,
3201 			       struct page *page,
3202 			       int len,
3203 			       struct writeback_control *wbc,
3204 			       bool keep_towrite);
3205 
3206 /* mmp.c */
3207 extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t);
3208 
3209 /*
3210  * Add new method to test whether block and inode bitmaps are properly
3211  * initialized. With uninit_bg reading the block from disk is not enough
3212  * to mark the bitmap uptodate. We need to also zero-out the bitmap
3213  */
3214 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart
3215 
3216 static inline int bitmap_uptodate(struct buffer_head *bh)
3217 {
3218 	return (buffer_uptodate(bh) &&
3219 			test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state));
3220 }
3221 static inline void set_bitmap_uptodate(struct buffer_head *bh)
3222 {
3223 	set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state);
3224 }
3225 
3226 /*
3227  * Disable DIO read nolock optimization, so new dioreaders will be forced
3228  * to grab i_mutex
3229  */
3230 static inline void ext4_inode_block_unlocked_dio(struct inode *inode)
3231 {
3232 	ext4_set_inode_state(inode, EXT4_STATE_DIOREAD_LOCK);
3233 	smp_mb();
3234 }
3235 static inline void ext4_inode_resume_unlocked_dio(struct inode *inode)
3236 {
3237 	smp_mb();
3238 	ext4_clear_inode_state(inode, EXT4_STATE_DIOREAD_LOCK);
3239 }
3240 
3241 #define in_range(b, first, len)	((b) >= (first) && (b) <= (first) + (len) - 1)
3242 
3243 /* For ioend & aio unwritten conversion wait queues */
3244 #define EXT4_WQ_HASH_SZ		37
3245 #define ext4_ioend_wq(v)   (&ext4__ioend_wq[((unsigned long)(v)) %\
3246 					    EXT4_WQ_HASH_SZ])
3247 extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
3248 
3249 extern int ext4_resize_begin(struct super_block *sb);
3250 extern void ext4_resize_end(struct super_block *sb);
3251 
3252 static inline void ext4_set_io_unwritten_flag(struct inode *inode,
3253 					      struct ext4_io_end *io_end)
3254 {
3255 	if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) {
3256 		io_end->flag |= EXT4_IO_END_UNWRITTEN;
3257 		atomic_inc(&EXT4_I(inode)->i_unwritten);
3258 	}
3259 }
3260 
3261 static inline void ext4_clear_io_unwritten_flag(ext4_io_end_t *io_end)
3262 {
3263 	struct inode *inode = io_end->inode;
3264 
3265 	if (io_end->flag & EXT4_IO_END_UNWRITTEN) {
3266 		io_end->flag &= ~EXT4_IO_END_UNWRITTEN;
3267 		/* Wake up anyone waiting on unwritten extent conversion */
3268 		if (atomic_dec_and_test(&EXT4_I(inode)->i_unwritten))
3269 			wake_up_all(ext4_ioend_wq(inode));
3270 	}
3271 }
3272 
3273 extern const struct iomap_ops ext4_iomap_ops;
3274 
3275 #endif	/* __KERNEL__ */
3276 
3277 #define EFSBADCRC	EBADMSG		/* Bad CRC detected */
3278 #define EFSCORRUPTED	EUCLEAN		/* Filesystem is corrupted */
3279 
3280 #endif	/* _EXT4_H */
3281