xref: /openbmc/linux/fs/ext4/ext4.h (revision 0441984a)
1 /*
2  *  ext4.h
3  *
4  * Copyright (C) 1992, 1993, 1994, 1995
5  * Remy Card (card@masi.ibp.fr)
6  * Laboratoire MASI - Institut Blaise Pascal
7  * Universite Pierre et Marie Curie (Paris VI)
8  *
9  *  from
10  *
11  *  linux/include/linux/minix_fs.h
12  *
13  *  Copyright (C) 1991, 1992  Linus Torvalds
14  */
15 
16 #ifndef _EXT4_H
17 #define _EXT4_H
18 
19 #include <linux/types.h>
20 #include <linux/blkdev.h>
21 #include <linux/magic.h>
22 #include <linux/jbd2.h>
23 #include <linux/quota.h>
24 #include <linux/rwsem.h>
25 #include <linux/rbtree.h>
26 #include <linux/seqlock.h>
27 #include <linux/mutex.h>
28 #include <linux/timer.h>
29 #include <linux/wait.h>
30 #include <linux/blockgroup_lock.h>
31 #include <linux/percpu_counter.h>
32 #include <crypto/hash.h>
33 #ifdef __KERNEL__
34 #include <linux/compat.h>
35 #endif
36 
37 /*
38  * The fourth extended filesystem constants/structures
39  */
40 
41 /*
42  * Define EXT4FS_DEBUG to produce debug messages
43  */
44 #undef EXT4FS_DEBUG
45 
46 /*
47  * Debug code
48  */
49 #ifdef EXT4FS_DEBUG
50 #define ext4_debug(f, a...)						\
51 	do {								\
52 		printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:",	\
53 			__FILE__, __LINE__, __func__);			\
54 		printk(KERN_DEBUG f, ## a);				\
55 	} while (0)
56 #else
57 #define ext4_debug(fmt, ...)	no_printk(fmt, ##__VA_ARGS__)
58 #endif
59 
60 #define EXT4_ERROR_INODE(inode, fmt, a...) \
61 	ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a)
62 
63 #define EXT4_ERROR_INODE_BLOCK(inode, block, fmt, a...)			\
64 	ext4_error_inode((inode), __func__, __LINE__, (block), (fmt), ## a)
65 
66 #define EXT4_ERROR_FILE(file, block, fmt, a...)				\
67 	ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a)
68 
69 /* data type for block offset of block group */
70 typedef int ext4_grpblk_t;
71 
72 /* data type for filesystem-wide blocks number */
73 typedef unsigned long long ext4_fsblk_t;
74 
75 /* data type for file logical block number */
76 typedef __u32 ext4_lblk_t;
77 
78 /* data type for block group number */
79 typedef unsigned int ext4_group_t;
80 
81 /*
82  * Flags used in mballoc's allocation_context flags field.
83  *
84  * Also used to show what's going on for debugging purposes when the
85  * flag field is exported via the traceport interface
86  */
87 
88 /* prefer goal again. length */
89 #define EXT4_MB_HINT_MERGE		0x0001
90 /* blocks already reserved */
91 #define EXT4_MB_HINT_RESERVED		0x0002
92 /* metadata is being allocated */
93 #define EXT4_MB_HINT_METADATA		0x0004
94 /* first blocks in the file */
95 #define EXT4_MB_HINT_FIRST		0x0008
96 /* search for the best chunk */
97 #define EXT4_MB_HINT_BEST		0x0010
98 /* data is being allocated */
99 #define EXT4_MB_HINT_DATA		0x0020
100 /* don't preallocate (for tails) */
101 #define EXT4_MB_HINT_NOPREALLOC		0x0040
102 /* allocate for locality group */
103 #define EXT4_MB_HINT_GROUP_ALLOC	0x0080
104 /* allocate goal blocks or none */
105 #define EXT4_MB_HINT_GOAL_ONLY		0x0100
106 /* goal is meaningful */
107 #define EXT4_MB_HINT_TRY_GOAL		0x0200
108 /* blocks already pre-reserved by delayed allocation */
109 #define EXT4_MB_DELALLOC_RESERVED	0x0400
110 /* We are doing stream allocation */
111 #define EXT4_MB_STREAM_ALLOC		0x0800
112 /* Use reserved root blocks if needed */
113 #define EXT4_MB_USE_ROOT_BLOCKS		0x1000
114 
115 struct ext4_allocation_request {
116 	/* target inode for block we're allocating */
117 	struct inode *inode;
118 	/* how many blocks we want to allocate */
119 	unsigned int len;
120 	/* logical block in target inode */
121 	ext4_lblk_t logical;
122 	/* the closest logical allocated block to the left */
123 	ext4_lblk_t lleft;
124 	/* the closest logical allocated block to the right */
125 	ext4_lblk_t lright;
126 	/* phys. target (a hint) */
127 	ext4_fsblk_t goal;
128 	/* phys. block for the closest logical allocated block to the left */
129 	ext4_fsblk_t pleft;
130 	/* phys. block for the closest logical allocated block to the right */
131 	ext4_fsblk_t pright;
132 	/* flags. see above EXT4_MB_HINT_* */
133 	unsigned int flags;
134 };
135 
136 /*
137  * Logical to physical block mapping, used by ext4_map_blocks()
138  *
139  * This structure is used to pass requests into ext4_map_blocks() as
140  * well as to store the information returned by ext4_map_blocks().  It
141  * takes less room on the stack than a struct buffer_head.
142  */
143 #define EXT4_MAP_NEW		(1 << BH_New)
144 #define EXT4_MAP_MAPPED		(1 << BH_Mapped)
145 #define EXT4_MAP_UNWRITTEN	(1 << BH_Unwritten)
146 #define EXT4_MAP_BOUNDARY	(1 << BH_Boundary)
147 #define EXT4_MAP_UNINIT		(1 << BH_Uninit)
148 /* Sometimes (in the bigalloc case, from ext4_da_get_block_prep) the caller of
149  * ext4_map_blocks wants to know whether or not the underlying cluster has
150  * already been accounted for. EXT4_MAP_FROM_CLUSTER conveys to the caller that
151  * the requested mapping was from previously mapped (or delayed allocated)
152  * cluster. We use BH_AllocFromCluster only for this flag. BH_AllocFromCluster
153  * should never appear on buffer_head's state flags.
154  */
155 #define EXT4_MAP_FROM_CLUSTER	(1 << BH_AllocFromCluster)
156 #define EXT4_MAP_FLAGS		(EXT4_MAP_NEW | EXT4_MAP_MAPPED |\
157 				 EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY |\
158 				 EXT4_MAP_UNINIT | EXT4_MAP_FROM_CLUSTER)
159 
160 struct ext4_map_blocks {
161 	ext4_fsblk_t m_pblk;
162 	ext4_lblk_t m_lblk;
163 	unsigned int m_len;
164 	unsigned int m_flags;
165 };
166 
167 /*
168  * For delayed allocation tracking
169  */
170 struct mpage_da_data {
171 	struct inode *inode;
172 	sector_t b_blocknr;		/* start block number of extent */
173 	size_t b_size;			/* size of extent */
174 	unsigned long b_state;		/* state of the extent */
175 	unsigned long first_page, next_page;	/* extent of pages */
176 	struct writeback_control *wbc;
177 	int io_done;
178 	int pages_written;
179 	int retval;
180 };
181 
182 /*
183  * Flags for ext4_io_end->flags
184  */
185 #define	EXT4_IO_END_UNWRITTEN	0x0001
186 #define EXT4_IO_END_ERROR	0x0002
187 #define EXT4_IO_END_QUEUED	0x0004
188 #define EXT4_IO_END_DIRECT	0x0008
189 #define EXT4_IO_END_IN_FSYNC	0x0010
190 
191 struct ext4_io_page {
192 	struct page	*p_page;
193 	atomic_t	p_count;
194 };
195 
196 #define MAX_IO_PAGES 128
197 
198 /*
199  * For converting uninitialized extents on a work queue.
200  *
201  * 'page' is only used from the writepage() path; 'pages' is only used for
202  * buffered writes; they are used to keep page references until conversion
203  * takes place.  For AIO/DIO, neither field is filled in.
204  */
205 typedef struct ext4_io_end {
206 	struct list_head	list;		/* per-file finished IO list */
207 	struct inode		*inode;		/* file being written to */
208 	unsigned int		flag;		/* unwritten or not */
209 	struct page		*page;		/* for writepage() path */
210 	loff_t			offset;		/* offset in the file */
211 	ssize_t			size;		/* size of the extent */
212 	struct work_struct	work;		/* data work queue */
213 	struct kiocb		*iocb;		/* iocb struct for AIO */
214 	int			result;		/* error value for AIO */
215 	int			num_io_pages;   /* for writepages() */
216 	struct ext4_io_page	*pages[MAX_IO_PAGES]; /* for writepages() */
217 } ext4_io_end_t;
218 
219 struct ext4_io_submit {
220 	int			io_op;
221 	struct bio		*io_bio;
222 	ext4_io_end_t		*io_end;
223 	struct ext4_io_page	*io_page;
224 	sector_t		io_next_block;
225 };
226 
227 /*
228  * Special inodes numbers
229  */
230 #define	EXT4_BAD_INO		 1	/* Bad blocks inode */
231 #define EXT4_ROOT_INO		 2	/* Root inode */
232 #define EXT4_USR_QUOTA_INO	 3	/* User quota inode */
233 #define EXT4_GRP_QUOTA_INO	 4	/* Group quota inode */
234 #define EXT4_BOOT_LOADER_INO	 5	/* Boot loader inode */
235 #define EXT4_UNDEL_DIR_INO	 6	/* Undelete directory inode */
236 #define EXT4_RESIZE_INO		 7	/* Reserved group descriptors inode */
237 #define EXT4_JOURNAL_INO	 8	/* Journal inode */
238 
239 /* First non-reserved inode for old ext4 filesystems */
240 #define EXT4_GOOD_OLD_FIRST_INO	11
241 
242 /*
243  * Maximal count of links to a file
244  */
245 #define EXT4_LINK_MAX		65000
246 
247 /*
248  * Macro-instructions used to manage several block sizes
249  */
250 #define EXT4_MIN_BLOCK_SIZE		1024
251 #define	EXT4_MAX_BLOCK_SIZE		65536
252 #define EXT4_MIN_BLOCK_LOG_SIZE		10
253 #define EXT4_MAX_BLOCK_LOG_SIZE		16
254 #ifdef __KERNEL__
255 # define EXT4_BLOCK_SIZE(s)		((s)->s_blocksize)
256 #else
257 # define EXT4_BLOCK_SIZE(s)		(EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
258 #endif
259 #define	EXT4_ADDR_PER_BLOCK(s)		(EXT4_BLOCK_SIZE(s) / sizeof(__u32))
260 #define EXT4_CLUSTER_SIZE(s)		(EXT4_BLOCK_SIZE(s) << \
261 					 EXT4_SB(s)->s_cluster_bits)
262 #ifdef __KERNEL__
263 # define EXT4_BLOCK_SIZE_BITS(s)	((s)->s_blocksize_bits)
264 # define EXT4_CLUSTER_BITS(s)		(EXT4_SB(s)->s_cluster_bits)
265 #else
266 # define EXT4_BLOCK_SIZE_BITS(s)	((s)->s_log_block_size + 10)
267 #endif
268 #ifdef __KERNEL__
269 #define	EXT4_ADDR_PER_BLOCK_BITS(s)	(EXT4_SB(s)->s_addr_per_block_bits)
270 #define EXT4_INODE_SIZE(s)		(EXT4_SB(s)->s_inode_size)
271 #define EXT4_FIRST_INO(s)		(EXT4_SB(s)->s_first_ino)
272 #else
273 #define EXT4_INODE_SIZE(s)	(((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
274 				 EXT4_GOOD_OLD_INODE_SIZE : \
275 				 (s)->s_inode_size)
276 #define EXT4_FIRST_INO(s)	(((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
277 				 EXT4_GOOD_OLD_FIRST_INO : \
278 				 (s)->s_first_ino)
279 #endif
280 #define EXT4_BLOCK_ALIGN(size, blkbits)		ALIGN((size), (1 << (blkbits)))
281 
282 /* Translate a block number to a cluster number */
283 #define EXT4_B2C(sbi, blk)	((blk) >> (sbi)->s_cluster_bits)
284 /* Translate a cluster number to a block number */
285 #define EXT4_C2B(sbi, cluster)	((cluster) << (sbi)->s_cluster_bits)
286 /* Translate # of blks to # of clusters */
287 #define EXT4_NUM_B2C(sbi, blks)	(((blks) + (sbi)->s_cluster_ratio - 1) >> \
288 				 (sbi)->s_cluster_bits)
289 
290 /*
291  * Structure of a blocks group descriptor
292  */
293 struct ext4_group_desc
294 {
295 	__le32	bg_block_bitmap_lo;	/* Blocks bitmap block */
296 	__le32	bg_inode_bitmap_lo;	/* Inodes bitmap block */
297 	__le32	bg_inode_table_lo;	/* Inodes table block */
298 	__le16	bg_free_blocks_count_lo;/* Free blocks count */
299 	__le16	bg_free_inodes_count_lo;/* Free inodes count */
300 	__le16	bg_used_dirs_count_lo;	/* Directories count */
301 	__le16	bg_flags;		/* EXT4_BG_flags (INODE_UNINIT, etc) */
302 	__le32  bg_exclude_bitmap_lo;   /* Exclude bitmap for snapshots */
303 	__le16  bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bbitmap) LE */
304 	__le16  bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+ibitmap) LE */
305 	__le16  bg_itable_unused_lo;	/* Unused inodes count */
306 	__le16  bg_checksum;		/* crc16(sb_uuid+group+desc) */
307 	__le32	bg_block_bitmap_hi;	/* Blocks bitmap block MSB */
308 	__le32	bg_inode_bitmap_hi;	/* Inodes bitmap block MSB */
309 	__le32	bg_inode_table_hi;	/* Inodes table block MSB */
310 	__le16	bg_free_blocks_count_hi;/* Free blocks count MSB */
311 	__le16	bg_free_inodes_count_hi;/* Free inodes count MSB */
312 	__le16	bg_used_dirs_count_hi;	/* Directories count MSB */
313 	__le16  bg_itable_unused_hi;    /* Unused inodes count MSB */
314 	__le32  bg_exclude_bitmap_hi;   /* Exclude bitmap block MSB */
315 	__le16  bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bbitmap) BE */
316 	__le16  bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+ibitmap) BE */
317 	__u32   bg_reserved;
318 };
319 
320 /*
321  * Structure of a flex block group info
322  */
323 
324 struct flex_groups {
325 	atomic_t free_inodes;
326 	atomic_t free_clusters;
327 	atomic_t used_dirs;
328 };
329 
330 #define EXT4_BG_INODE_UNINIT	0x0001 /* Inode table/bitmap not in use */
331 #define EXT4_BG_BLOCK_UNINIT	0x0002 /* Block bitmap not in use */
332 #define EXT4_BG_INODE_ZEROED	0x0004 /* On-disk itable initialized to zero */
333 
334 /*
335  * Macro-instructions used to manage group descriptors
336  */
337 #define EXT4_MIN_DESC_SIZE		32
338 #define EXT4_MIN_DESC_SIZE_64BIT	64
339 #define	EXT4_MAX_DESC_SIZE		EXT4_MIN_BLOCK_SIZE
340 #define EXT4_DESC_SIZE(s)		(EXT4_SB(s)->s_desc_size)
341 #ifdef __KERNEL__
342 # define EXT4_BLOCKS_PER_GROUP(s)	(EXT4_SB(s)->s_blocks_per_group)
343 # define EXT4_CLUSTERS_PER_GROUP(s)	(EXT4_SB(s)->s_clusters_per_group)
344 # define EXT4_DESC_PER_BLOCK(s)		(EXT4_SB(s)->s_desc_per_block)
345 # define EXT4_INODES_PER_GROUP(s)	(EXT4_SB(s)->s_inodes_per_group)
346 # define EXT4_DESC_PER_BLOCK_BITS(s)	(EXT4_SB(s)->s_desc_per_block_bits)
347 #else
348 # define EXT4_BLOCKS_PER_GROUP(s)	((s)->s_blocks_per_group)
349 # define EXT4_DESC_PER_BLOCK(s)		(EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
350 # define EXT4_INODES_PER_GROUP(s)	((s)->s_inodes_per_group)
351 #endif
352 
353 /*
354  * Constants relative to the data blocks
355  */
356 #define	EXT4_NDIR_BLOCKS		12
357 #define	EXT4_IND_BLOCK			EXT4_NDIR_BLOCKS
358 #define	EXT4_DIND_BLOCK			(EXT4_IND_BLOCK + 1)
359 #define	EXT4_TIND_BLOCK			(EXT4_DIND_BLOCK + 1)
360 #define	EXT4_N_BLOCKS			(EXT4_TIND_BLOCK + 1)
361 
362 /*
363  * Inode flags
364  */
365 #define	EXT4_SECRM_FL			0x00000001 /* Secure deletion */
366 #define	EXT4_UNRM_FL			0x00000002 /* Undelete */
367 #define	EXT4_COMPR_FL			0x00000004 /* Compress file */
368 #define EXT4_SYNC_FL			0x00000008 /* Synchronous updates */
369 #define EXT4_IMMUTABLE_FL		0x00000010 /* Immutable file */
370 #define EXT4_APPEND_FL			0x00000020 /* writes to file may only append */
371 #define EXT4_NODUMP_FL			0x00000040 /* do not dump file */
372 #define EXT4_NOATIME_FL			0x00000080 /* do not update atime */
373 /* Reserved for compression usage... */
374 #define EXT4_DIRTY_FL			0x00000100
375 #define EXT4_COMPRBLK_FL		0x00000200 /* One or more compressed clusters */
376 #define EXT4_NOCOMPR_FL			0x00000400 /* Don't compress */
377 #define EXT4_ECOMPR_FL			0x00000800 /* Compression error */
378 /* End compression flags --- maybe not all used */
379 #define EXT4_INDEX_FL			0x00001000 /* hash-indexed directory */
380 #define EXT4_IMAGIC_FL			0x00002000 /* AFS directory */
381 #define EXT4_JOURNAL_DATA_FL		0x00004000 /* file data should be journaled */
382 #define EXT4_NOTAIL_FL			0x00008000 /* file tail should not be merged */
383 #define EXT4_DIRSYNC_FL			0x00010000 /* dirsync behaviour (directories only) */
384 #define EXT4_TOPDIR_FL			0x00020000 /* Top of directory hierarchies*/
385 #define EXT4_HUGE_FILE_FL               0x00040000 /* Set to each huge file */
386 #define EXT4_EXTENTS_FL			0x00080000 /* Inode uses extents */
387 #define EXT4_EA_INODE_FL	        0x00200000 /* Inode used for large EA */
388 #define EXT4_EOFBLOCKS_FL		0x00400000 /* Blocks allocated beyond EOF */
389 #define EXT4_RESERVED_FL		0x80000000 /* reserved for ext4 lib */
390 
391 #define EXT4_FL_USER_VISIBLE		0x004BDFFF /* User visible flags */
392 #define EXT4_FL_USER_MODIFIABLE		0x004B80FF /* User modifiable flags */
393 
394 /* Flags that should be inherited by new inodes from their parent. */
395 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\
396 			   EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\
397 			   EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\
398 			   EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL)
399 
400 /* Flags that are appropriate for regular files (all but dir-specific ones). */
401 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL))
402 
403 /* Flags that are appropriate for non-directories/regular files. */
404 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL)
405 
406 /* Mask out flags that are inappropriate for the given type of inode. */
407 static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags)
408 {
409 	if (S_ISDIR(mode))
410 		return flags;
411 	else if (S_ISREG(mode))
412 		return flags & EXT4_REG_FLMASK;
413 	else
414 		return flags & EXT4_OTHER_FLMASK;
415 }
416 
417 /*
418  * Inode flags used for atomic set/get
419  */
420 enum {
421 	EXT4_INODE_SECRM	= 0,	/* Secure deletion */
422 	EXT4_INODE_UNRM		= 1,	/* Undelete */
423 	EXT4_INODE_COMPR	= 2,	/* Compress file */
424 	EXT4_INODE_SYNC		= 3,	/* Synchronous updates */
425 	EXT4_INODE_IMMUTABLE	= 4,	/* Immutable file */
426 	EXT4_INODE_APPEND	= 5,	/* writes to file may only append */
427 	EXT4_INODE_NODUMP	= 6,	/* do not dump file */
428 	EXT4_INODE_NOATIME	= 7,	/* do not update atime */
429 /* Reserved for compression usage... */
430 	EXT4_INODE_DIRTY	= 8,
431 	EXT4_INODE_COMPRBLK	= 9,	/* One or more compressed clusters */
432 	EXT4_INODE_NOCOMPR	= 10,	/* Don't compress */
433 	EXT4_INODE_ECOMPR	= 11,	/* Compression error */
434 /* End compression flags --- maybe not all used */
435 	EXT4_INODE_INDEX	= 12,	/* hash-indexed directory */
436 	EXT4_INODE_IMAGIC	= 13,	/* AFS directory */
437 	EXT4_INODE_JOURNAL_DATA	= 14,	/* file data should be journaled */
438 	EXT4_INODE_NOTAIL	= 15,	/* file tail should not be merged */
439 	EXT4_INODE_DIRSYNC	= 16,	/* dirsync behaviour (directories only) */
440 	EXT4_INODE_TOPDIR	= 17,	/* Top of directory hierarchies*/
441 	EXT4_INODE_HUGE_FILE	= 18,	/* Set to each huge file */
442 	EXT4_INODE_EXTENTS	= 19,	/* Inode uses extents */
443 	EXT4_INODE_EA_INODE	= 21,	/* Inode used for large EA */
444 	EXT4_INODE_EOFBLOCKS	= 22,	/* Blocks allocated beyond EOF */
445 	EXT4_INODE_RESERVED	= 31,	/* reserved for ext4 lib */
446 };
447 
448 #define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG))
449 #define CHECK_FLAG_VALUE(FLAG) if (!TEST_FLAG_VALUE(FLAG)) { \
450 	printk(KERN_EMERG "EXT4 flag fail: " #FLAG ": %d %d\n", \
451 		EXT4_##FLAG##_FL, EXT4_INODE_##FLAG); BUG_ON(1); }
452 
453 /*
454  * Since it's pretty easy to mix up bit numbers and hex values, and we
455  * can't do a compile-time test for ENUM values, we use a run-time
456  * test to make sure that EXT4_XXX_FL is consistent with respect to
457  * EXT4_INODE_XXX.  If all is well the printk and BUG_ON will all drop
458  * out so it won't cost any extra space in the compiled kernel image.
459  * But it's important that these values are the same, since we are
460  * using EXT4_INODE_XXX to test for the flag values, but EXT4_XX_FL
461  * must be consistent with the values of FS_XXX_FL defined in
462  * include/linux/fs.h and the on-disk values found in ext2, ext3, and
463  * ext4 filesystems, and of course the values defined in e2fsprogs.
464  *
465  * It's not paranoia if the Murphy's Law really *is* out to get you.  :-)
466  */
467 static inline void ext4_check_flag_values(void)
468 {
469 	CHECK_FLAG_VALUE(SECRM);
470 	CHECK_FLAG_VALUE(UNRM);
471 	CHECK_FLAG_VALUE(COMPR);
472 	CHECK_FLAG_VALUE(SYNC);
473 	CHECK_FLAG_VALUE(IMMUTABLE);
474 	CHECK_FLAG_VALUE(APPEND);
475 	CHECK_FLAG_VALUE(NODUMP);
476 	CHECK_FLAG_VALUE(NOATIME);
477 	CHECK_FLAG_VALUE(DIRTY);
478 	CHECK_FLAG_VALUE(COMPRBLK);
479 	CHECK_FLAG_VALUE(NOCOMPR);
480 	CHECK_FLAG_VALUE(ECOMPR);
481 	CHECK_FLAG_VALUE(INDEX);
482 	CHECK_FLAG_VALUE(IMAGIC);
483 	CHECK_FLAG_VALUE(JOURNAL_DATA);
484 	CHECK_FLAG_VALUE(NOTAIL);
485 	CHECK_FLAG_VALUE(DIRSYNC);
486 	CHECK_FLAG_VALUE(TOPDIR);
487 	CHECK_FLAG_VALUE(HUGE_FILE);
488 	CHECK_FLAG_VALUE(EXTENTS);
489 	CHECK_FLAG_VALUE(EA_INODE);
490 	CHECK_FLAG_VALUE(EOFBLOCKS);
491 	CHECK_FLAG_VALUE(RESERVED);
492 }
493 
494 /* Used to pass group descriptor data when online resize is done */
495 struct ext4_new_group_input {
496 	__u32 group;		/* Group number for this data */
497 	__u64 block_bitmap;	/* Absolute block number of block bitmap */
498 	__u64 inode_bitmap;	/* Absolute block number of inode bitmap */
499 	__u64 inode_table;	/* Absolute block number of inode table start */
500 	__u32 blocks_count;	/* Total number of blocks in this group */
501 	__u16 reserved_blocks;	/* Number of reserved blocks in this group */
502 	__u16 unused;
503 };
504 
505 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
506 struct compat_ext4_new_group_input {
507 	u32 group;
508 	compat_u64 block_bitmap;
509 	compat_u64 inode_bitmap;
510 	compat_u64 inode_table;
511 	u32 blocks_count;
512 	u16 reserved_blocks;
513 	u16 unused;
514 };
515 #endif
516 
517 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */
518 struct ext4_new_group_data {
519 	__u32 group;
520 	__u64 block_bitmap;
521 	__u64 inode_bitmap;
522 	__u64 inode_table;
523 	__u32 blocks_count;
524 	__u16 reserved_blocks;
525 	__u16 unused;
526 	__u32 free_blocks_count;
527 };
528 
529 /* Indexes used to index group tables in ext4_new_group_data */
530 enum {
531 	BLOCK_BITMAP = 0,	/* block bitmap */
532 	INODE_BITMAP,		/* inode bitmap */
533 	INODE_TABLE,		/* inode tables */
534 	GROUP_TABLE_COUNT,
535 };
536 
537 /*
538  * Flags used by ext4_map_blocks()
539  */
540 	/* Allocate any needed blocks and/or convert an unitialized
541 	   extent to be an initialized ext4 */
542 #define EXT4_GET_BLOCKS_CREATE			0x0001
543 	/* Request the creation of an unitialized extent */
544 #define EXT4_GET_BLOCKS_UNINIT_EXT		0x0002
545 #define EXT4_GET_BLOCKS_CREATE_UNINIT_EXT	(EXT4_GET_BLOCKS_UNINIT_EXT|\
546 						 EXT4_GET_BLOCKS_CREATE)
547 	/* Caller is from the delayed allocation writeout path,
548 	   so set the magic i_delalloc_reserve_flag after taking the
549 	   inode allocation semaphore for */
550 #define EXT4_GET_BLOCKS_DELALLOC_RESERVE	0x0004
551 	/* caller is from the direct IO path, request to creation of an
552 	unitialized extents if not allocated, split the uninitialized
553 	extent if blocks has been preallocated already*/
554 #define EXT4_GET_BLOCKS_PRE_IO			0x0008
555 #define EXT4_GET_BLOCKS_CONVERT			0x0010
556 #define EXT4_GET_BLOCKS_IO_CREATE_EXT		(EXT4_GET_BLOCKS_PRE_IO|\
557 					 EXT4_GET_BLOCKS_CREATE_UNINIT_EXT)
558 	/* Convert extent to initialized after IO complete */
559 #define EXT4_GET_BLOCKS_IO_CONVERT_EXT		(EXT4_GET_BLOCKS_CONVERT|\
560 					 EXT4_GET_BLOCKS_CREATE_UNINIT_EXT)
561 	/* Punch out blocks of an extent */
562 #define EXT4_GET_BLOCKS_PUNCH_OUT_EXT		0x0020
563 	/* Don't normalize allocation size (used for fallocate) */
564 #define EXT4_GET_BLOCKS_NO_NORMALIZE		0x0040
565 	/* Request will not result in inode size update (user for fallocate) */
566 #define EXT4_GET_BLOCKS_KEEP_SIZE		0x0080
567 
568 /*
569  * Flags used by ext4_free_blocks
570  */
571 #define EXT4_FREE_BLOCKS_METADATA	0x0001
572 #define EXT4_FREE_BLOCKS_FORGET		0x0002
573 #define EXT4_FREE_BLOCKS_VALIDATED	0x0004
574 #define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE	0x0008
575 #define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER	0x0010
576 #define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER	0x0020
577 
578 /*
579  * Flags used by ext4_discard_partial_page_buffers
580  */
581 #define EXT4_DISCARD_PARTIAL_PG_ZERO_UNMAPPED	0x0001
582 
583 /*
584  * ioctl commands
585  */
586 #define	EXT4_IOC_GETFLAGS		FS_IOC_GETFLAGS
587 #define	EXT4_IOC_SETFLAGS		FS_IOC_SETFLAGS
588 #define	EXT4_IOC_GETVERSION		_IOR('f', 3, long)
589 #define	EXT4_IOC_SETVERSION		_IOW('f', 4, long)
590 #define	EXT4_IOC_GETVERSION_OLD		FS_IOC_GETVERSION
591 #define	EXT4_IOC_SETVERSION_OLD		FS_IOC_SETVERSION
592 #define EXT4_IOC_GETRSVSZ		_IOR('f', 5, long)
593 #define EXT4_IOC_SETRSVSZ		_IOW('f', 6, long)
594 #define EXT4_IOC_GROUP_EXTEND		_IOW('f', 7, unsigned long)
595 #define EXT4_IOC_GROUP_ADD		_IOW('f', 8, struct ext4_new_group_input)
596 #define EXT4_IOC_MIGRATE		_IO('f', 9)
597  /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */
598  /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */
599 #define EXT4_IOC_ALLOC_DA_BLKS		_IO('f', 12)
600 #define EXT4_IOC_MOVE_EXT		_IOWR('f', 15, struct move_extent)
601 #define EXT4_IOC_RESIZE_FS		_IOW('f', 16, __u64)
602 
603 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
604 /*
605  * ioctl commands in 32 bit emulation
606  */
607 #define EXT4_IOC32_GETFLAGS		FS_IOC32_GETFLAGS
608 #define EXT4_IOC32_SETFLAGS		FS_IOC32_SETFLAGS
609 #define EXT4_IOC32_GETVERSION		_IOR('f', 3, int)
610 #define EXT4_IOC32_SETVERSION		_IOW('f', 4, int)
611 #define EXT4_IOC32_GETRSVSZ		_IOR('f', 5, int)
612 #define EXT4_IOC32_SETRSVSZ		_IOW('f', 6, int)
613 #define EXT4_IOC32_GROUP_EXTEND		_IOW('f', 7, unsigned int)
614 #define EXT4_IOC32_GROUP_ADD		_IOW('f', 8, struct compat_ext4_new_group_input)
615 #define EXT4_IOC32_GETVERSION_OLD	FS_IOC32_GETVERSION
616 #define EXT4_IOC32_SETVERSION_OLD	FS_IOC32_SETVERSION
617 #endif
618 
619 /* Max physical block we can address w/o extents */
620 #define EXT4_MAX_BLOCK_FILE_PHYS	0xFFFFFFFF
621 
622 /*
623  * Structure of an inode on the disk
624  */
625 struct ext4_inode {
626 	__le16	i_mode;		/* File mode */
627 	__le16	i_uid;		/* Low 16 bits of Owner Uid */
628 	__le32	i_size_lo;	/* Size in bytes */
629 	__le32	i_atime;	/* Access time */
630 	__le32	i_ctime;	/* Inode Change time */
631 	__le32	i_mtime;	/* Modification time */
632 	__le32	i_dtime;	/* Deletion Time */
633 	__le16	i_gid;		/* Low 16 bits of Group Id */
634 	__le16	i_links_count;	/* Links count */
635 	__le32	i_blocks_lo;	/* Blocks count */
636 	__le32	i_flags;	/* File flags */
637 	union {
638 		struct {
639 			__le32  l_i_version;
640 		} linux1;
641 		struct {
642 			__u32  h_i_translator;
643 		} hurd1;
644 		struct {
645 			__u32  m_i_reserved1;
646 		} masix1;
647 	} osd1;				/* OS dependent 1 */
648 	__le32	i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
649 	__le32	i_generation;	/* File version (for NFS) */
650 	__le32	i_file_acl_lo;	/* File ACL */
651 	__le32	i_size_high;
652 	__le32	i_obso_faddr;	/* Obsoleted fragment address */
653 	union {
654 		struct {
655 			__le16	l_i_blocks_high; /* were l_i_reserved1 */
656 			__le16	l_i_file_acl_high;
657 			__le16	l_i_uid_high;	/* these 2 fields */
658 			__le16	l_i_gid_high;	/* were reserved2[0] */
659 			__le16	l_i_checksum_lo;/* crc32c(uuid+inum+inode) LE */
660 			__le16	l_i_reserved;
661 		} linux2;
662 		struct {
663 			__le16	h_i_reserved1;	/* Obsoleted fragment number/size which are removed in ext4 */
664 			__u16	h_i_mode_high;
665 			__u16	h_i_uid_high;
666 			__u16	h_i_gid_high;
667 			__u32	h_i_author;
668 		} hurd2;
669 		struct {
670 			__le16	h_i_reserved1;	/* Obsoleted fragment number/size which are removed in ext4 */
671 			__le16	m_i_file_acl_high;
672 			__u32	m_i_reserved2[2];
673 		} masix2;
674 	} osd2;				/* OS dependent 2 */
675 	__le16	i_extra_isize;
676 	__le16	i_checksum_hi;	/* crc32c(uuid+inum+inode) BE */
677 	__le32  i_ctime_extra;  /* extra Change time      (nsec << 2 | epoch) */
678 	__le32  i_mtime_extra;  /* extra Modification time(nsec << 2 | epoch) */
679 	__le32  i_atime_extra;  /* extra Access time      (nsec << 2 | epoch) */
680 	__le32  i_crtime;       /* File Creation time */
681 	__le32  i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */
682 	__le32  i_version_hi;	/* high 32 bits for 64-bit version */
683 };
684 
685 struct move_extent {
686 	__u32 reserved;		/* should be zero */
687 	__u32 donor_fd;		/* donor file descriptor */
688 	__u64 orig_start;	/* logical start offset in block for orig */
689 	__u64 donor_start;	/* logical start offset in block for donor */
690 	__u64 len;		/* block length to be moved */
691 	__u64 moved_len;	/* moved block length */
692 };
693 
694 #define EXT4_EPOCH_BITS 2
695 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
696 #define EXT4_NSEC_MASK  (~0UL << EXT4_EPOCH_BITS)
697 
698 /*
699  * Extended fields will fit into an inode if the filesystem was formatted
700  * with large inodes (-I 256 or larger) and there are not currently any EAs
701  * consuming all of the available space. For new inodes we always reserve
702  * enough space for the kernel's known extended fields, but for inodes
703  * created with an old kernel this might not have been the case. None of
704  * the extended inode fields is critical for correct filesystem operation.
705  * This macro checks if a certain field fits in the inode. Note that
706  * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
707  */
708 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field)	\
709 	((offsetof(typeof(*ext4_inode), field) +	\
710 	  sizeof((ext4_inode)->field))			\
711 	<= (EXT4_GOOD_OLD_INODE_SIZE +			\
712 	    (einode)->i_extra_isize))			\
713 
714 static inline __le32 ext4_encode_extra_time(struct timespec *time)
715 {
716        return cpu_to_le32((sizeof(time->tv_sec) > 4 ?
717 			   (time->tv_sec >> 32) & EXT4_EPOCH_MASK : 0) |
718                           ((time->tv_nsec << EXT4_EPOCH_BITS) & EXT4_NSEC_MASK));
719 }
720 
721 static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra)
722 {
723        if (sizeof(time->tv_sec) > 4)
724 	       time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK)
725 			       << 32;
726        time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS;
727 }
728 
729 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode)			       \
730 do {									       \
731 	(raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec);	       \
732 	if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra))     \
733 		(raw_inode)->xtime ## _extra =				       \
734 				ext4_encode_extra_time(&(inode)->xtime);       \
735 } while (0)
736 
737 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode)			       \
738 do {									       \
739 	if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime))		       \
740 		(raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec);      \
741 	if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra))	       \
742 		(raw_inode)->xtime ## _extra =				       \
743 				ext4_encode_extra_time(&(einode)->xtime);      \
744 } while (0)
745 
746 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode)			       \
747 do {									       \
748 	(inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime);       \
749 	if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra))     \
750 		ext4_decode_extra_time(&(inode)->xtime,			       \
751 				       raw_inode->xtime ## _extra);	       \
752 	else								       \
753 		(inode)->xtime.tv_nsec = 0;				       \
754 } while (0)
755 
756 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode)			       \
757 do {									       \
758 	if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime))		       \
759 		(einode)->xtime.tv_sec = 				       \
760 			(signed)le32_to_cpu((raw_inode)->xtime);	       \
761 	if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra))	       \
762 		ext4_decode_extra_time(&(einode)->xtime,		       \
763 				       raw_inode->xtime ## _extra);	       \
764 	else								       \
765 		(einode)->xtime.tv_nsec = 0;				       \
766 } while (0)
767 
768 #define i_disk_version osd1.linux1.l_i_version
769 
770 #if defined(__KERNEL__) || defined(__linux__)
771 #define i_reserved1	osd1.linux1.l_i_reserved1
772 #define i_file_acl_high	osd2.linux2.l_i_file_acl_high
773 #define i_blocks_high	osd2.linux2.l_i_blocks_high
774 #define i_uid_low	i_uid
775 #define i_gid_low	i_gid
776 #define i_uid_high	osd2.linux2.l_i_uid_high
777 #define i_gid_high	osd2.linux2.l_i_gid_high
778 #define i_checksum_lo	osd2.linux2.l_i_checksum_lo
779 
780 #elif defined(__GNU__)
781 
782 #define i_translator	osd1.hurd1.h_i_translator
783 #define i_uid_high	osd2.hurd2.h_i_uid_high
784 #define i_gid_high	osd2.hurd2.h_i_gid_high
785 #define i_author	osd2.hurd2.h_i_author
786 
787 #elif defined(__masix__)
788 
789 #define i_reserved1	osd1.masix1.m_i_reserved1
790 #define i_file_acl_high	osd2.masix2.m_i_file_acl_high
791 #define i_reserved2	osd2.masix2.m_i_reserved2
792 
793 #endif /* defined(__KERNEL__) || defined(__linux__) */
794 
795 /*
796  * storage for cached extent
797  * If ec_len == 0, then the cache is invalid.
798  * If ec_start == 0, then the cache represents a gap (null mapping)
799  */
800 struct ext4_ext_cache {
801 	ext4_fsblk_t	ec_start;
802 	ext4_lblk_t	ec_block;
803 	__u32		ec_len; /* must be 32bit to return holes */
804 };
805 
806 /*
807  * fourth extended file system inode data in memory
808  */
809 struct ext4_inode_info {
810 	__le32	i_data[15];	/* unconverted */
811 	__u32	i_dtime;
812 	ext4_fsblk_t	i_file_acl;
813 
814 	/*
815 	 * i_block_group is the number of the block group which contains
816 	 * this file's inode.  Constant across the lifetime of the inode,
817 	 * it is ued for making block allocation decisions - we try to
818 	 * place a file's data blocks near its inode block, and new inodes
819 	 * near to their parent directory's inode.
820 	 */
821 	ext4_group_t	i_block_group;
822 	ext4_lblk_t	i_dir_start_lookup;
823 #if (BITS_PER_LONG < 64)
824 	unsigned long	i_state_flags;		/* Dynamic state flags */
825 #endif
826 	unsigned long	i_flags;
827 
828 #ifdef CONFIG_EXT4_FS_XATTR
829 	/*
830 	 * Extended attributes can be read independently of the main file
831 	 * data. Taking i_mutex even when reading would cause contention
832 	 * between readers of EAs and writers of regular file data, so
833 	 * instead we synchronize on xattr_sem when reading or changing
834 	 * EAs.
835 	 */
836 	struct rw_semaphore xattr_sem;
837 #endif
838 
839 	struct list_head i_orphan;	/* unlinked but open inodes */
840 
841 	/*
842 	 * i_disksize keeps track of what the inode size is ON DISK, not
843 	 * in memory.  During truncate, i_size is set to the new size by
844 	 * the VFS prior to calling ext4_truncate(), but the filesystem won't
845 	 * set i_disksize to 0 until the truncate is actually under way.
846 	 *
847 	 * The intent is that i_disksize always represents the blocks which
848 	 * are used by this file.  This allows recovery to restart truncate
849 	 * on orphans if we crash during truncate.  We actually write i_disksize
850 	 * into the on-disk inode when writing inodes out, instead of i_size.
851 	 *
852 	 * The only time when i_disksize and i_size may be different is when
853 	 * a truncate is in progress.  The only things which change i_disksize
854 	 * are ext4_get_block (growth) and ext4_truncate (shrinkth).
855 	 */
856 	loff_t	i_disksize;
857 
858 	/*
859 	 * i_data_sem is for serialising ext4_truncate() against
860 	 * ext4_getblock().  In the 2.4 ext2 design, great chunks of inode's
861 	 * data tree are chopped off during truncate. We can't do that in
862 	 * ext4 because whenever we perform intermediate commits during
863 	 * truncate, the inode and all the metadata blocks *must* be in a
864 	 * consistent state which allows truncation of the orphans to restart
865 	 * during recovery.  Hence we must fix the get_block-vs-truncate race
866 	 * by other means, so we have i_data_sem.
867 	 */
868 	struct rw_semaphore i_data_sem;
869 	struct inode vfs_inode;
870 	struct jbd2_inode *jinode;
871 
872 	struct ext4_ext_cache i_cached_extent;
873 	/*
874 	 * File creation time. Its function is same as that of
875 	 * struct timespec i_{a,c,m}time in the generic inode.
876 	 */
877 	struct timespec i_crtime;
878 
879 	/* mballoc */
880 	struct list_head i_prealloc_list;
881 	spinlock_t i_prealloc_lock;
882 
883 	/* ialloc */
884 	ext4_group_t	i_last_alloc_group;
885 
886 	/* allocation reservation info for delalloc */
887 	/* In case of bigalloc, these refer to clusters rather than blocks */
888 	unsigned int i_reserved_data_blocks;
889 	unsigned int i_reserved_meta_blocks;
890 	unsigned int i_allocated_meta_blocks;
891 	ext4_lblk_t i_da_metadata_calc_last_lblock;
892 	int i_da_metadata_calc_len;
893 
894 	/* on-disk additional length */
895 	__u16 i_extra_isize;
896 
897 #ifdef CONFIG_QUOTA
898 	/* quota space reservation, managed internally by quota code */
899 	qsize_t i_reserved_quota;
900 #endif
901 
902 	/* completed IOs that might need unwritten extents handling */
903 	struct list_head i_completed_io_list;
904 	spinlock_t i_completed_io_lock;
905 	atomic_t i_ioend_count;	/* Number of outstanding io_end structs */
906 	/* current io_end structure for async DIO write*/
907 	ext4_io_end_t *cur_aio_dio;
908 	atomic_t i_aiodio_unwritten; /* Nr. of inflight conversions pending */
909 
910 	spinlock_t i_block_reservation_lock;
911 
912 	/*
913 	 * Transactions that contain inode's metadata needed to complete
914 	 * fsync and fdatasync, respectively.
915 	 */
916 	tid_t i_sync_tid;
917 	tid_t i_datasync_tid;
918 };
919 
920 /*
921  * File system states
922  */
923 #define	EXT4_VALID_FS			0x0001	/* Unmounted cleanly */
924 #define	EXT4_ERROR_FS			0x0002	/* Errors detected */
925 #define	EXT4_ORPHAN_FS			0x0004	/* Orphans being recovered */
926 
927 /*
928  * Misc. filesystem flags
929  */
930 #define EXT2_FLAGS_SIGNED_HASH		0x0001  /* Signed dirhash in use */
931 #define EXT2_FLAGS_UNSIGNED_HASH	0x0002  /* Unsigned dirhash in use */
932 #define EXT2_FLAGS_TEST_FILESYS		0x0004	/* to test development code */
933 
934 /*
935  * Mount flags
936  */
937 #define EXT4_MOUNT_GRPID		0x00004	/* Create files with directory's group */
938 #define EXT4_MOUNT_DEBUG		0x00008	/* Some debugging messages */
939 #define EXT4_MOUNT_ERRORS_CONT		0x00010	/* Continue on errors */
940 #define EXT4_MOUNT_ERRORS_RO		0x00020	/* Remount fs ro on errors */
941 #define EXT4_MOUNT_ERRORS_PANIC		0x00040	/* Panic on errors */
942 #define EXT4_MOUNT_ERRORS_MASK		0x00070
943 #define EXT4_MOUNT_MINIX_DF		0x00080	/* Mimics the Minix statfs */
944 #define EXT4_MOUNT_NOLOAD		0x00100	/* Don't use existing journal*/
945 #define EXT4_MOUNT_DATA_FLAGS		0x00C00	/* Mode for data writes: */
946 #define EXT4_MOUNT_JOURNAL_DATA		0x00400	/* Write data to journal */
947 #define EXT4_MOUNT_ORDERED_DATA		0x00800	/* Flush data before commit */
948 #define EXT4_MOUNT_WRITEBACK_DATA	0x00C00	/* No data ordering */
949 #define EXT4_MOUNT_UPDATE_JOURNAL	0x01000	/* Update the journal format */
950 #define EXT4_MOUNT_NO_UID32		0x02000  /* Disable 32-bit UIDs */
951 #define EXT4_MOUNT_XATTR_USER		0x04000	/* Extended user attributes */
952 #define EXT4_MOUNT_POSIX_ACL		0x08000	/* POSIX Access Control Lists */
953 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC	0x10000	/* No auto delalloc mapping */
954 #define EXT4_MOUNT_BARRIER		0x20000 /* Use block barriers */
955 #define EXT4_MOUNT_QUOTA		0x80000 /* Some quota option set */
956 #define EXT4_MOUNT_USRQUOTA		0x100000 /* "old" user quota */
957 #define EXT4_MOUNT_GRPQUOTA		0x200000 /* "old" group quota */
958 #define EXT4_MOUNT_DIOREAD_NOLOCK	0x400000 /* Enable support for dio read nolocking */
959 #define EXT4_MOUNT_JOURNAL_CHECKSUM	0x800000 /* Journal checksums */
960 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT	0x1000000 /* Journal Async Commit */
961 #define EXT4_MOUNT_MBLK_IO_SUBMIT	0x4000000 /* multi-block io submits */
962 #define EXT4_MOUNT_DELALLOC		0x8000000 /* Delalloc support */
963 #define EXT4_MOUNT_DATA_ERR_ABORT	0x10000000 /* Abort on file data write */
964 #define EXT4_MOUNT_BLOCK_VALIDITY	0x20000000 /* Block validity checking */
965 #define EXT4_MOUNT_DISCARD		0x40000000 /* Issue DISCARD requests */
966 #define EXT4_MOUNT_INIT_INODE_TABLE	0x80000000 /* Initialize uninitialized itables */
967 
968 #define EXT4_MOUNT2_EXPLICIT_DELALLOC	0x00000001 /* User explicitly
969 						      specified delalloc */
970 
971 #define clear_opt(sb, opt)		EXT4_SB(sb)->s_mount_opt &= \
972 						~EXT4_MOUNT_##opt
973 #define set_opt(sb, opt)		EXT4_SB(sb)->s_mount_opt |= \
974 						EXT4_MOUNT_##opt
975 #define test_opt(sb, opt)		(EXT4_SB(sb)->s_mount_opt & \
976 					 EXT4_MOUNT_##opt)
977 
978 #define clear_opt2(sb, opt)		EXT4_SB(sb)->s_mount_opt2 &= \
979 						~EXT4_MOUNT2_##opt
980 #define set_opt2(sb, opt)		EXT4_SB(sb)->s_mount_opt2 |= \
981 						EXT4_MOUNT2_##opt
982 #define test_opt2(sb, opt)		(EXT4_SB(sb)->s_mount_opt2 & \
983 					 EXT4_MOUNT2_##opt)
984 
985 #define ext4_test_and_set_bit		__test_and_set_bit_le
986 #define ext4_set_bit			__set_bit_le
987 #define ext4_set_bit_atomic		ext2_set_bit_atomic
988 #define ext4_test_and_clear_bit		__test_and_clear_bit_le
989 #define ext4_clear_bit			__clear_bit_le
990 #define ext4_clear_bit_atomic		ext2_clear_bit_atomic
991 #define ext4_test_bit			test_bit_le
992 #define ext4_find_next_zero_bit		find_next_zero_bit_le
993 #define ext4_find_next_bit		find_next_bit_le
994 
995 extern void ext4_set_bits(void *bm, int cur, int len);
996 
997 /*
998  * Maximal mount counts between two filesystem checks
999  */
1000 #define EXT4_DFL_MAX_MNT_COUNT		20	/* Allow 20 mounts */
1001 #define EXT4_DFL_CHECKINTERVAL		0	/* Don't use interval check */
1002 
1003 /*
1004  * Behaviour when detecting errors
1005  */
1006 #define EXT4_ERRORS_CONTINUE		1	/* Continue execution */
1007 #define EXT4_ERRORS_RO			2	/* Remount fs read-only */
1008 #define EXT4_ERRORS_PANIC		3	/* Panic */
1009 #define EXT4_ERRORS_DEFAULT		EXT4_ERRORS_CONTINUE
1010 
1011 /* Metadata checksum algorithm codes */
1012 #define EXT4_CRC32C_CHKSUM		1
1013 
1014 /*
1015  * Structure of the super block
1016  */
1017 struct ext4_super_block {
1018 /*00*/	__le32	s_inodes_count;		/* Inodes count */
1019 	__le32	s_blocks_count_lo;	/* Blocks count */
1020 	__le32	s_r_blocks_count_lo;	/* Reserved blocks count */
1021 	__le32	s_free_blocks_count_lo;	/* Free blocks count */
1022 /*10*/	__le32	s_free_inodes_count;	/* Free inodes count */
1023 	__le32	s_first_data_block;	/* First Data Block */
1024 	__le32	s_log_block_size;	/* Block size */
1025 	__le32	s_log_cluster_size;	/* Allocation cluster size */
1026 /*20*/	__le32	s_blocks_per_group;	/* # Blocks per group */
1027 	__le32	s_clusters_per_group;	/* # Clusters per group */
1028 	__le32	s_inodes_per_group;	/* # Inodes per group */
1029 	__le32	s_mtime;		/* Mount time */
1030 /*30*/	__le32	s_wtime;		/* Write time */
1031 	__le16	s_mnt_count;		/* Mount count */
1032 	__le16	s_max_mnt_count;	/* Maximal mount count */
1033 	__le16	s_magic;		/* Magic signature */
1034 	__le16	s_state;		/* File system state */
1035 	__le16	s_errors;		/* Behaviour when detecting errors */
1036 	__le16	s_minor_rev_level;	/* minor revision level */
1037 /*40*/	__le32	s_lastcheck;		/* time of last check */
1038 	__le32	s_checkinterval;	/* max. time between checks */
1039 	__le32	s_creator_os;		/* OS */
1040 	__le32	s_rev_level;		/* Revision level */
1041 /*50*/	__le16	s_def_resuid;		/* Default uid for reserved blocks */
1042 	__le16	s_def_resgid;		/* Default gid for reserved blocks */
1043 	/*
1044 	 * These fields are for EXT4_DYNAMIC_REV superblocks only.
1045 	 *
1046 	 * Note: the difference between the compatible feature set and
1047 	 * the incompatible feature set is that if there is a bit set
1048 	 * in the incompatible feature set that the kernel doesn't
1049 	 * know about, it should refuse to mount the filesystem.
1050 	 *
1051 	 * e2fsck's requirements are more strict; if it doesn't know
1052 	 * about a feature in either the compatible or incompatible
1053 	 * feature set, it must abort and not try to meddle with
1054 	 * things it doesn't understand...
1055 	 */
1056 	__le32	s_first_ino;		/* First non-reserved inode */
1057 	__le16  s_inode_size;		/* size of inode structure */
1058 	__le16	s_block_group_nr;	/* block group # of this superblock */
1059 	__le32	s_feature_compat;	/* compatible feature set */
1060 /*60*/	__le32	s_feature_incompat;	/* incompatible feature set */
1061 	__le32	s_feature_ro_compat;	/* readonly-compatible feature set */
1062 /*68*/	__u8	s_uuid[16];		/* 128-bit uuid for volume */
1063 /*78*/	char	s_volume_name[16];	/* volume name */
1064 /*88*/	char	s_last_mounted[64];	/* directory where last mounted */
1065 /*C8*/	__le32	s_algorithm_usage_bitmap; /* For compression */
1066 	/*
1067 	 * Performance hints.  Directory preallocation should only
1068 	 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
1069 	 */
1070 	__u8	s_prealloc_blocks;	/* Nr of blocks to try to preallocate*/
1071 	__u8	s_prealloc_dir_blocks;	/* Nr to preallocate for dirs */
1072 	__le16	s_reserved_gdt_blocks;	/* Per group desc for online growth */
1073 	/*
1074 	 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
1075 	 */
1076 /*D0*/	__u8	s_journal_uuid[16];	/* uuid of journal superblock */
1077 /*E0*/	__le32	s_journal_inum;		/* inode number of journal file */
1078 	__le32	s_journal_dev;		/* device number of journal file */
1079 	__le32	s_last_orphan;		/* start of list of inodes to delete */
1080 	__le32	s_hash_seed[4];		/* HTREE hash seed */
1081 	__u8	s_def_hash_version;	/* Default hash version to use */
1082 	__u8	s_jnl_backup_type;
1083 	__le16  s_desc_size;		/* size of group descriptor */
1084 /*100*/	__le32	s_default_mount_opts;
1085 	__le32	s_first_meta_bg;	/* First metablock block group */
1086 	__le32	s_mkfs_time;		/* When the filesystem was created */
1087 	__le32	s_jnl_blocks[17];	/* Backup of the journal inode */
1088 	/* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
1089 /*150*/	__le32	s_blocks_count_hi;	/* Blocks count */
1090 	__le32	s_r_blocks_count_hi;	/* Reserved blocks count */
1091 	__le32	s_free_blocks_count_hi;	/* Free blocks count */
1092 	__le16	s_min_extra_isize;	/* All inodes have at least # bytes */
1093 	__le16	s_want_extra_isize; 	/* New inodes should reserve # bytes */
1094 	__le32	s_flags;		/* Miscellaneous flags */
1095 	__le16  s_raid_stride;		/* RAID stride */
1096 	__le16  s_mmp_update_interval;  /* # seconds to wait in MMP checking */
1097 	__le64  s_mmp_block;            /* Block for multi-mount protection */
1098 	__le32  s_raid_stripe_width;    /* blocks on all data disks (N*stride)*/
1099 	__u8	s_log_groups_per_flex;  /* FLEX_BG group size */
1100 	__u8	s_checksum_type;	/* metadata checksum algorithm used */
1101 	__le16  s_reserved_pad;
1102 	__le64	s_kbytes_written;	/* nr of lifetime kilobytes written */
1103 	__le32	s_snapshot_inum;	/* Inode number of active snapshot */
1104 	__le32	s_snapshot_id;		/* sequential ID of active snapshot */
1105 	__le64	s_snapshot_r_blocks_count; /* reserved blocks for active
1106 					      snapshot's future use */
1107 	__le32	s_snapshot_list;	/* inode number of the head of the
1108 					   on-disk snapshot list */
1109 #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count)
1110 	__le32	s_error_count;		/* number of fs errors */
1111 	__le32	s_first_error_time;	/* first time an error happened */
1112 	__le32	s_first_error_ino;	/* inode involved in first error */
1113 	__le64	s_first_error_block;	/* block involved of first error */
1114 	__u8	s_first_error_func[32];	/* function where the error happened */
1115 	__le32	s_first_error_line;	/* line number where error happened */
1116 	__le32	s_last_error_time;	/* most recent time of an error */
1117 	__le32	s_last_error_ino;	/* inode involved in last error */
1118 	__le32	s_last_error_line;	/* line number where error happened */
1119 	__le64	s_last_error_block;	/* block involved of last error */
1120 	__u8	s_last_error_func[32];	/* function where the error happened */
1121 #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts)
1122 	__u8	s_mount_opts[64];
1123 	__le32	s_usr_quota_inum;	/* inode for tracking user quota */
1124 	__le32	s_grp_quota_inum;	/* inode for tracking group quota */
1125 	__le32	s_overhead_clusters;	/* overhead blocks/clusters in fs */
1126 	__le32	s_reserved[108];	/* Padding to the end of the block */
1127 	__le32	s_checksum;		/* crc32c(superblock) */
1128 };
1129 
1130 #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START)
1131 
1132 #ifdef __KERNEL__
1133 
1134 /*
1135  * run-time mount flags
1136  */
1137 #define EXT4_MF_MNTDIR_SAMPLED	0x0001
1138 #define EXT4_MF_FS_ABORTED	0x0002	/* Fatal error detected */
1139 
1140 /*
1141  * fourth extended-fs super-block data in memory
1142  */
1143 struct ext4_sb_info {
1144 	unsigned long s_desc_size;	/* Size of a group descriptor in bytes */
1145 	unsigned long s_inodes_per_block;/* Number of inodes per block */
1146 	unsigned long s_blocks_per_group;/* Number of blocks in a group */
1147 	unsigned long s_clusters_per_group; /* Number of clusters in a group */
1148 	unsigned long s_inodes_per_group;/* Number of inodes in a group */
1149 	unsigned long s_itb_per_group;	/* Number of inode table blocks per group */
1150 	unsigned long s_gdb_count;	/* Number of group descriptor blocks */
1151 	unsigned long s_desc_per_block;	/* Number of group descriptors per block */
1152 	ext4_group_t s_groups_count;	/* Number of groups in the fs */
1153 	ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */
1154 	unsigned long s_overhead_last;  /* Last calculated overhead */
1155 	unsigned long s_blocks_last;    /* Last seen block count */
1156 	unsigned int s_cluster_ratio;	/* Number of blocks per cluster */
1157 	unsigned int s_cluster_bits;	/* log2 of s_cluster_ratio */
1158 	loff_t s_bitmap_maxbytes;	/* max bytes for bitmap files */
1159 	struct buffer_head * s_sbh;	/* Buffer containing the super block */
1160 	struct ext4_super_block *s_es;	/* Pointer to the super block in the buffer */
1161 	struct buffer_head **s_group_desc;
1162 	unsigned int s_mount_opt;
1163 	unsigned int s_mount_opt2;
1164 	unsigned int s_mount_flags;
1165 	unsigned int s_def_mount_opt;
1166 	ext4_fsblk_t s_sb_block;
1167 	uid_t s_resuid;
1168 	gid_t s_resgid;
1169 	unsigned short s_mount_state;
1170 	unsigned short s_pad;
1171 	int s_addr_per_block_bits;
1172 	int s_desc_per_block_bits;
1173 	int s_inode_size;
1174 	int s_first_ino;
1175 	unsigned int s_inode_readahead_blks;
1176 	unsigned int s_inode_goal;
1177 	spinlock_t s_next_gen_lock;
1178 	u32 s_next_generation;
1179 	u32 s_hash_seed[4];
1180 	int s_def_hash_version;
1181 	int s_hash_unsigned;	/* 3 if hash should be signed, 0 if not */
1182 	struct percpu_counter s_freeclusters_counter;
1183 	struct percpu_counter s_freeinodes_counter;
1184 	struct percpu_counter s_dirs_counter;
1185 	struct percpu_counter s_dirtyclusters_counter;
1186 	struct blockgroup_lock *s_blockgroup_lock;
1187 	struct proc_dir_entry *s_proc;
1188 	struct kobject s_kobj;
1189 	struct completion s_kobj_unregister;
1190 
1191 	/* Journaling */
1192 	struct journal_s *s_journal;
1193 	struct list_head s_orphan;
1194 	struct mutex s_orphan_lock;
1195 	unsigned long s_resize_flags;		/* Flags indicating if there
1196 						   is a resizer */
1197 	unsigned long s_commit_interval;
1198 	u32 s_max_batch_time;
1199 	u32 s_min_batch_time;
1200 	struct block_device *journal_bdev;
1201 #ifdef CONFIG_QUOTA
1202 	char *s_qf_names[MAXQUOTAS];		/* Names of quota files with journalled quota */
1203 	int s_jquota_fmt;			/* Format of quota to use */
1204 #endif
1205 	unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */
1206 	struct rb_root system_blks;
1207 
1208 #ifdef EXTENTS_STATS
1209 	/* ext4 extents stats */
1210 	unsigned long s_ext_min;
1211 	unsigned long s_ext_max;
1212 	unsigned long s_depth_max;
1213 	spinlock_t s_ext_stats_lock;
1214 	unsigned long s_ext_blocks;
1215 	unsigned long s_ext_extents;
1216 #endif
1217 
1218 	/* for buddy allocator */
1219 	struct ext4_group_info ***s_group_info;
1220 	struct inode *s_buddy_cache;
1221 	spinlock_t s_md_lock;
1222 	unsigned short *s_mb_offsets;
1223 	unsigned int *s_mb_maxs;
1224 
1225 	/* tunables */
1226 	unsigned long s_stripe;
1227 	unsigned int s_mb_stream_request;
1228 	unsigned int s_mb_max_to_scan;
1229 	unsigned int s_mb_min_to_scan;
1230 	unsigned int s_mb_stats;
1231 	unsigned int s_mb_order2_reqs;
1232 	unsigned int s_mb_group_prealloc;
1233 	unsigned int s_max_writeback_mb_bump;
1234 	/* where last allocation was done - for stream allocation */
1235 	unsigned long s_mb_last_group;
1236 	unsigned long s_mb_last_start;
1237 
1238 	/* stats for buddy allocator */
1239 	atomic_t s_bal_reqs;	/* number of reqs with len > 1 */
1240 	atomic_t s_bal_success;	/* we found long enough chunks */
1241 	atomic_t s_bal_allocated;	/* in blocks */
1242 	atomic_t s_bal_ex_scanned;	/* total extents scanned */
1243 	atomic_t s_bal_goals;	/* goal hits */
1244 	atomic_t s_bal_breaks;	/* too long searches */
1245 	atomic_t s_bal_2orders;	/* 2^order hits */
1246 	spinlock_t s_bal_lock;
1247 	unsigned long s_mb_buddies_generated;
1248 	unsigned long long s_mb_generation_time;
1249 	atomic_t s_mb_lost_chunks;
1250 	atomic_t s_mb_preallocated;
1251 	atomic_t s_mb_discarded;
1252 	atomic_t s_lock_busy;
1253 
1254 	/* locality groups */
1255 	struct ext4_locality_group __percpu *s_locality_groups;
1256 
1257 	/* for write statistics */
1258 	unsigned long s_sectors_written_start;
1259 	u64 s_kbytes_written;
1260 
1261 	unsigned int s_log_groups_per_flex;
1262 	struct flex_groups *s_flex_groups;
1263 
1264 	/* workqueue for dio unwritten */
1265 	struct workqueue_struct *dio_unwritten_wq;
1266 
1267 	/* timer for periodic error stats printing */
1268 	struct timer_list s_err_report;
1269 
1270 	/* Lazy inode table initialization info */
1271 	struct ext4_li_request *s_li_request;
1272 	/* Wait multiplier for lazy initialization thread */
1273 	unsigned int s_li_wait_mult;
1274 
1275 	/* Kernel thread for multiple mount protection */
1276 	struct task_struct *s_mmp_tsk;
1277 
1278 	/* record the last minlen when FITRIM is called. */
1279 	atomic_t s_last_trim_minblks;
1280 
1281 	/* Reference to checksum algorithm driver via cryptoapi */
1282 	struct crypto_shash *s_chksum_driver;
1283 };
1284 
1285 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb)
1286 {
1287 	return sb->s_fs_info;
1288 }
1289 static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
1290 {
1291 	return container_of(inode, struct ext4_inode_info, vfs_inode);
1292 }
1293 
1294 static inline struct timespec ext4_current_time(struct inode *inode)
1295 {
1296 	return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ?
1297 		current_fs_time(inode->i_sb) : CURRENT_TIME_SEC;
1298 }
1299 
1300 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
1301 {
1302 	return ino == EXT4_ROOT_INO ||
1303 		ino == EXT4_JOURNAL_INO ||
1304 		ino == EXT4_RESIZE_INO ||
1305 		(ino >= EXT4_FIRST_INO(sb) &&
1306 		 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
1307 }
1308 
1309 static inline void ext4_set_io_unwritten_flag(struct inode *inode,
1310 					      struct ext4_io_end *io_end)
1311 {
1312 	if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) {
1313 		io_end->flag |= EXT4_IO_END_UNWRITTEN;
1314 		atomic_inc(&EXT4_I(inode)->i_aiodio_unwritten);
1315 	}
1316 }
1317 
1318 /*
1319  * Inode dynamic state flags
1320  */
1321 enum {
1322 	EXT4_STATE_JDATA,		/* journaled data exists */
1323 	EXT4_STATE_NEW,			/* inode is newly created */
1324 	EXT4_STATE_XATTR,		/* has in-inode xattrs */
1325 	EXT4_STATE_NO_EXPAND,		/* No space for expansion */
1326 	EXT4_STATE_DA_ALLOC_CLOSE,	/* Alloc DA blks on close */
1327 	EXT4_STATE_EXT_MIGRATE,		/* Inode is migrating */
1328 	EXT4_STATE_DIO_UNWRITTEN,	/* need convert on dio done*/
1329 	EXT4_STATE_NEWENTRY,		/* File just added to dir */
1330 	EXT4_STATE_DELALLOC_RESERVED,	/* blks already reserved for delalloc */
1331 };
1332 
1333 #define EXT4_INODE_BIT_FNS(name, field, offset)				\
1334 static inline int ext4_test_inode_##name(struct inode *inode, int bit)	\
1335 {									\
1336 	return test_bit(bit + (offset), &EXT4_I(inode)->i_##field);	\
1337 }									\
1338 static inline void ext4_set_inode_##name(struct inode *inode, int bit)	\
1339 {									\
1340 	set_bit(bit + (offset), &EXT4_I(inode)->i_##field);		\
1341 }									\
1342 static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \
1343 {									\
1344 	clear_bit(bit + (offset), &EXT4_I(inode)->i_##field);		\
1345 }
1346 
1347 EXT4_INODE_BIT_FNS(flag, flags, 0)
1348 #if (BITS_PER_LONG < 64)
1349 EXT4_INODE_BIT_FNS(state, state_flags, 0)
1350 
1351 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1352 {
1353 	(ei)->i_state_flags = 0;
1354 }
1355 #else
1356 EXT4_INODE_BIT_FNS(state, flags, 32)
1357 
1358 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1359 {
1360 	/* We depend on the fact that callers will set i_flags */
1361 }
1362 #endif
1363 #else
1364 /* Assume that user mode programs are passing in an ext4fs superblock, not
1365  * a kernel struct super_block.  This will allow us to call the feature-test
1366  * macros from user land. */
1367 #define EXT4_SB(sb)	(sb)
1368 #endif
1369 
1370 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
1371 
1372 /*
1373  * Codes for operating systems
1374  */
1375 #define EXT4_OS_LINUX		0
1376 #define EXT4_OS_HURD		1
1377 #define EXT4_OS_MASIX		2
1378 #define EXT4_OS_FREEBSD		3
1379 #define EXT4_OS_LITES		4
1380 
1381 /*
1382  * Revision levels
1383  */
1384 #define EXT4_GOOD_OLD_REV	0	/* The good old (original) format */
1385 #define EXT4_DYNAMIC_REV	1	/* V2 format w/ dynamic inode sizes */
1386 
1387 #define EXT4_CURRENT_REV	EXT4_GOOD_OLD_REV
1388 #define EXT4_MAX_SUPP_REV	EXT4_DYNAMIC_REV
1389 
1390 #define EXT4_GOOD_OLD_INODE_SIZE 128
1391 
1392 /*
1393  * Feature set definitions
1394  */
1395 
1396 #define EXT4_HAS_COMPAT_FEATURE(sb,mask)			\
1397 	((EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask)) != 0)
1398 #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask)			\
1399 	((EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask)) != 0)
1400 #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask)			\
1401 	((EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask)) != 0)
1402 #define EXT4_SET_COMPAT_FEATURE(sb,mask)			\
1403 	EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
1404 #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask)			\
1405 	EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
1406 #define EXT4_SET_INCOMPAT_FEATURE(sb,mask)			\
1407 	EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
1408 #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask)			\
1409 	EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
1410 #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask)			\
1411 	EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
1412 #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask)			\
1413 	EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
1414 
1415 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC	0x0001
1416 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES	0x0002
1417 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL		0x0004
1418 #define EXT4_FEATURE_COMPAT_EXT_ATTR		0x0008
1419 #define EXT4_FEATURE_COMPAT_RESIZE_INODE	0x0010
1420 #define EXT4_FEATURE_COMPAT_DIR_INDEX		0x0020
1421 
1422 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER	0x0001
1423 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE	0x0002
1424 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR	0x0004
1425 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE        0x0008
1426 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM		0x0010
1427 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK	0x0020
1428 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE	0x0040
1429 #define EXT4_FEATURE_RO_COMPAT_QUOTA		0x0100
1430 #define EXT4_FEATURE_RO_COMPAT_BIGALLOC		0x0200
1431 /*
1432  * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM).  When
1433  * METADATA_CSUM is set, group descriptor checksums use the same algorithm as
1434  * all other data structures' checksums.  However, the METADATA_CSUM and
1435  * GDT_CSUM bits are mutually exclusive.
1436  */
1437 #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM	0x0400
1438 
1439 #define EXT4_FEATURE_INCOMPAT_COMPRESSION	0x0001
1440 #define EXT4_FEATURE_INCOMPAT_FILETYPE		0x0002
1441 #define EXT4_FEATURE_INCOMPAT_RECOVER		0x0004 /* Needs recovery */
1442 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV	0x0008 /* Journal device */
1443 #define EXT4_FEATURE_INCOMPAT_META_BG		0x0010
1444 #define EXT4_FEATURE_INCOMPAT_EXTENTS		0x0040 /* extents support */
1445 #define EXT4_FEATURE_INCOMPAT_64BIT		0x0080
1446 #define EXT4_FEATURE_INCOMPAT_MMP               0x0100
1447 #define EXT4_FEATURE_INCOMPAT_FLEX_BG		0x0200
1448 #define EXT4_FEATURE_INCOMPAT_EA_INODE		0x0400 /* EA in inode */
1449 #define EXT4_FEATURE_INCOMPAT_DIRDATA		0x1000 /* data in dirent */
1450 #define EXT4_FEATURE_INCOMPAT_BG_USE_META_CSUM	0x2000 /* use crc32c for bg */
1451 #define EXT4_FEATURE_INCOMPAT_LARGEDIR		0x4000 /* >2GB or 3-lvl htree */
1452 #define EXT4_FEATURE_INCOMPAT_INLINEDATA	0x8000 /* data in inode */
1453 
1454 #define EXT2_FEATURE_COMPAT_SUPP	EXT4_FEATURE_COMPAT_EXT_ATTR
1455 #define EXT2_FEATURE_INCOMPAT_SUPP	(EXT4_FEATURE_INCOMPAT_FILETYPE| \
1456 					 EXT4_FEATURE_INCOMPAT_META_BG)
1457 #define EXT2_FEATURE_RO_COMPAT_SUPP	(EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1458 					 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1459 					 EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
1460 
1461 #define EXT3_FEATURE_COMPAT_SUPP	EXT4_FEATURE_COMPAT_EXT_ATTR
1462 #define EXT3_FEATURE_INCOMPAT_SUPP	(EXT4_FEATURE_INCOMPAT_FILETYPE| \
1463 					 EXT4_FEATURE_INCOMPAT_RECOVER| \
1464 					 EXT4_FEATURE_INCOMPAT_META_BG)
1465 #define EXT3_FEATURE_RO_COMPAT_SUPP	(EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1466 					 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1467 					 EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
1468 
1469 #define EXT4_FEATURE_COMPAT_SUPP	EXT2_FEATURE_COMPAT_EXT_ATTR
1470 #define EXT4_FEATURE_INCOMPAT_SUPP	(EXT4_FEATURE_INCOMPAT_FILETYPE| \
1471 					 EXT4_FEATURE_INCOMPAT_RECOVER| \
1472 					 EXT4_FEATURE_INCOMPAT_META_BG| \
1473 					 EXT4_FEATURE_INCOMPAT_EXTENTS| \
1474 					 EXT4_FEATURE_INCOMPAT_64BIT| \
1475 					 EXT4_FEATURE_INCOMPAT_FLEX_BG| \
1476 					 EXT4_FEATURE_INCOMPAT_MMP)
1477 #define EXT4_FEATURE_RO_COMPAT_SUPP	(EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1478 					 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1479 					 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
1480 					 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
1481 					 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
1482 					 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
1483 					 EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\
1484 					 EXT4_FEATURE_RO_COMPAT_BIGALLOC)
1485 
1486 /*
1487  * Default values for user and/or group using reserved blocks
1488  */
1489 #define	EXT4_DEF_RESUID		0
1490 #define	EXT4_DEF_RESGID		0
1491 
1492 #define EXT4_DEF_INODE_READAHEAD_BLKS	32
1493 
1494 /*
1495  * Default mount options
1496  */
1497 #define EXT4_DEFM_DEBUG		0x0001
1498 #define EXT4_DEFM_BSDGROUPS	0x0002
1499 #define EXT4_DEFM_XATTR_USER	0x0004
1500 #define EXT4_DEFM_ACL		0x0008
1501 #define EXT4_DEFM_UID16		0x0010
1502 #define EXT4_DEFM_JMODE		0x0060
1503 #define EXT4_DEFM_JMODE_DATA	0x0020
1504 #define EXT4_DEFM_JMODE_ORDERED	0x0040
1505 #define EXT4_DEFM_JMODE_WBACK	0x0060
1506 #define EXT4_DEFM_NOBARRIER	0x0100
1507 #define EXT4_DEFM_BLOCK_VALIDITY 0x0200
1508 #define EXT4_DEFM_DISCARD	0x0400
1509 #define EXT4_DEFM_NODELALLOC	0x0800
1510 
1511 /*
1512  * Default journal batch times
1513  */
1514 #define EXT4_DEF_MIN_BATCH_TIME	0
1515 #define EXT4_DEF_MAX_BATCH_TIME	15000 /* 15ms */
1516 
1517 /*
1518  * Minimum number of groups in a flexgroup before we separate out
1519  * directories into the first block group of a flexgroup
1520  */
1521 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME	4
1522 
1523 /*
1524  * Structure of a directory entry
1525  */
1526 #define EXT4_NAME_LEN 255
1527 
1528 struct ext4_dir_entry {
1529 	__le32	inode;			/* Inode number */
1530 	__le16	rec_len;		/* Directory entry length */
1531 	__le16	name_len;		/* Name length */
1532 	char	name[EXT4_NAME_LEN];	/* File name */
1533 };
1534 
1535 /*
1536  * The new version of the directory entry.  Since EXT4 structures are
1537  * stored in intel byte order, and the name_len field could never be
1538  * bigger than 255 chars, it's safe to reclaim the extra byte for the
1539  * file_type field.
1540  */
1541 struct ext4_dir_entry_2 {
1542 	__le32	inode;			/* Inode number */
1543 	__le16	rec_len;		/* Directory entry length */
1544 	__u8	name_len;		/* Name length */
1545 	__u8	file_type;
1546 	char	name[EXT4_NAME_LEN];	/* File name */
1547 };
1548 
1549 /*
1550  * This is a bogus directory entry at the end of each leaf block that
1551  * records checksums.
1552  */
1553 struct ext4_dir_entry_tail {
1554 	__le32	det_reserved_zero1;	/* Pretend to be unused */
1555 	__le16	det_rec_len;		/* 12 */
1556 	__u8	det_reserved_zero2;	/* Zero name length */
1557 	__u8	det_reserved_ft;	/* 0xDE, fake file type */
1558 	__le32	det_checksum;		/* crc32c(uuid+inum+dirblock) */
1559 };
1560 
1561 /*
1562  * Ext4 directory file types.  Only the low 3 bits are used.  The
1563  * other bits are reserved for now.
1564  */
1565 #define EXT4_FT_UNKNOWN		0
1566 #define EXT4_FT_REG_FILE	1
1567 #define EXT4_FT_DIR		2
1568 #define EXT4_FT_CHRDEV		3
1569 #define EXT4_FT_BLKDEV		4
1570 #define EXT4_FT_FIFO		5
1571 #define EXT4_FT_SOCK		6
1572 #define EXT4_FT_SYMLINK		7
1573 
1574 #define EXT4_FT_MAX		8
1575 
1576 #define EXT4_FT_DIR_CSUM	0xDE
1577 
1578 /*
1579  * EXT4_DIR_PAD defines the directory entries boundaries
1580  *
1581  * NOTE: It must be a multiple of 4
1582  */
1583 #define EXT4_DIR_PAD			4
1584 #define EXT4_DIR_ROUND			(EXT4_DIR_PAD - 1)
1585 #define EXT4_DIR_REC_LEN(name_len)	(((name_len) + 8 + EXT4_DIR_ROUND) & \
1586 					 ~EXT4_DIR_ROUND)
1587 #define EXT4_MAX_REC_LEN		((1<<16)-1)
1588 
1589 /*
1590  * If we ever get support for fs block sizes > page_size, we'll need
1591  * to remove the #if statements in the next two functions...
1592  */
1593 static inline unsigned int
1594 ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize)
1595 {
1596 	unsigned len = le16_to_cpu(dlen);
1597 
1598 #if (PAGE_CACHE_SIZE >= 65536)
1599 	if (len == EXT4_MAX_REC_LEN || len == 0)
1600 		return blocksize;
1601 	return (len & 65532) | ((len & 3) << 16);
1602 #else
1603 	return len;
1604 #endif
1605 }
1606 
1607 static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize)
1608 {
1609 	if ((len > blocksize) || (blocksize > (1 << 18)) || (len & 3))
1610 		BUG();
1611 #if (PAGE_CACHE_SIZE >= 65536)
1612 	if (len < 65536)
1613 		return cpu_to_le16(len);
1614 	if (len == blocksize) {
1615 		if (blocksize == 65536)
1616 			return cpu_to_le16(EXT4_MAX_REC_LEN);
1617 		else
1618 			return cpu_to_le16(0);
1619 	}
1620 	return cpu_to_le16((len & 65532) | ((len >> 16) & 3));
1621 #else
1622 	return cpu_to_le16(len);
1623 #endif
1624 }
1625 
1626 /*
1627  * Hash Tree Directory indexing
1628  * (c) Daniel Phillips, 2001
1629  */
1630 
1631 #define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \
1632 				      EXT4_FEATURE_COMPAT_DIR_INDEX) && \
1633 		    ext4_test_inode_flag((dir), EXT4_INODE_INDEX))
1634 #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX)
1635 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
1636 
1637 /* Legal values for the dx_root hash_version field: */
1638 
1639 #define DX_HASH_LEGACY		0
1640 #define DX_HASH_HALF_MD4	1
1641 #define DX_HASH_TEA		2
1642 #define DX_HASH_LEGACY_UNSIGNED	3
1643 #define DX_HASH_HALF_MD4_UNSIGNED	4
1644 #define DX_HASH_TEA_UNSIGNED		5
1645 
1646 static inline u32 ext4_chksum(struct ext4_sb_info *sbi, u32 crc,
1647 			      const void *address, unsigned int length)
1648 {
1649 	struct {
1650 		struct shash_desc shash;
1651 		char ctx[crypto_shash_descsize(sbi->s_chksum_driver)];
1652 	} desc;
1653 	int err;
1654 
1655 	desc.shash.tfm = sbi->s_chksum_driver;
1656 	desc.shash.flags = 0;
1657 	*(u32 *)desc.ctx = crc;
1658 
1659 	err = crypto_shash_update(&desc.shash, address, length);
1660 	BUG_ON(err);
1661 
1662 	return *(u32 *)desc.ctx;
1663 }
1664 
1665 #ifdef __KERNEL__
1666 
1667 /* hash info structure used by the directory hash */
1668 struct dx_hash_info
1669 {
1670 	u32		hash;
1671 	u32		minor_hash;
1672 	int		hash_version;
1673 	u32		*seed;
1674 };
1675 
1676 
1677 /* 32 and 64 bit signed EOF for dx directories */
1678 #define EXT4_HTREE_EOF_32BIT   ((1UL  << (32 - 1)) - 1)
1679 #define EXT4_HTREE_EOF_64BIT   ((1ULL << (64 - 1)) - 1)
1680 
1681 
1682 /*
1683  * Control parameters used by ext4_htree_next_block
1684  */
1685 #define HASH_NB_ALWAYS		1
1686 
1687 
1688 /*
1689  * Describe an inode's exact location on disk and in memory
1690  */
1691 struct ext4_iloc
1692 {
1693 	struct buffer_head *bh;
1694 	unsigned long offset;
1695 	ext4_group_t block_group;
1696 };
1697 
1698 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
1699 {
1700 	return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
1701 }
1702 
1703 /*
1704  * This structure is stuffed into the struct file's private_data field
1705  * for directories.  It is where we put information so that we can do
1706  * readdir operations in hash tree order.
1707  */
1708 struct dir_private_info {
1709 	struct rb_root	root;
1710 	struct rb_node	*curr_node;
1711 	struct fname	*extra_fname;
1712 	loff_t		last_pos;
1713 	__u32		curr_hash;
1714 	__u32		curr_minor_hash;
1715 	__u32		next_hash;
1716 };
1717 
1718 /* calculate the first block number of the group */
1719 static inline ext4_fsblk_t
1720 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no)
1721 {
1722 	return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
1723 		le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
1724 }
1725 
1726 /*
1727  * Special error return code only used by dx_probe() and its callers.
1728  */
1729 #define ERR_BAD_DX_DIR	-75000
1730 
1731 void ext4_get_group_no_and_offset(struct super_block *sb, ext4_fsblk_t blocknr,
1732 			ext4_group_t *blockgrpp, ext4_grpblk_t *offsetp);
1733 
1734 /*
1735  * Timeout and state flag for lazy initialization inode thread.
1736  */
1737 #define EXT4_DEF_LI_WAIT_MULT			10
1738 #define EXT4_DEF_LI_MAX_START_DELAY		5
1739 #define EXT4_LAZYINIT_QUIT			0x0001
1740 #define EXT4_LAZYINIT_RUNNING			0x0002
1741 
1742 /*
1743  * Lazy inode table initialization info
1744  */
1745 struct ext4_lazy_init {
1746 	unsigned long		li_state;
1747 	struct list_head	li_request_list;
1748 	struct mutex		li_list_mtx;
1749 };
1750 
1751 struct ext4_li_request {
1752 	struct super_block	*lr_super;
1753 	struct ext4_sb_info	*lr_sbi;
1754 	ext4_group_t		lr_next_group;
1755 	struct list_head	lr_request;
1756 	unsigned long		lr_next_sched;
1757 	unsigned long		lr_timeout;
1758 };
1759 
1760 struct ext4_features {
1761 	struct kobject f_kobj;
1762 	struct completion f_kobj_unregister;
1763 };
1764 
1765 /*
1766  * This structure will be used for multiple mount protection. It will be
1767  * written into the block number saved in the s_mmp_block field in the
1768  * superblock. Programs that check MMP should assume that if
1769  * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe
1770  * to use the filesystem, regardless of how old the timestamp is.
1771  */
1772 #define EXT4_MMP_MAGIC     0x004D4D50U /* ASCII for MMP */
1773 #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */
1774 #define EXT4_MMP_SEQ_FSCK  0xE24D4D50U /* mmp_seq value when being fscked */
1775 #define EXT4_MMP_SEQ_MAX   0xE24D4D4FU /* maximum valid mmp_seq value */
1776 
1777 struct mmp_struct {
1778 	__le32	mmp_magic;		/* Magic number for MMP */
1779 	__le32	mmp_seq;		/* Sequence no. updated periodically */
1780 
1781 	/*
1782 	 * mmp_time, mmp_nodename & mmp_bdevname are only used for information
1783 	 * purposes and do not affect the correctness of the algorithm
1784 	 */
1785 	__le64	mmp_time;		/* Time last updated */
1786 	char	mmp_nodename[64];	/* Node which last updated MMP block */
1787 	char	mmp_bdevname[32];	/* Bdev which last updated MMP block */
1788 
1789 	/*
1790 	 * mmp_check_interval is used to verify if the MMP block has been
1791 	 * updated on the block device. The value is updated based on the
1792 	 * maximum time to write the MMP block during an update cycle.
1793 	 */
1794 	__le16	mmp_check_interval;
1795 
1796 	__le16	mmp_pad1;
1797 	__le32	mmp_pad2[226];
1798 	__le32	mmp_checksum;		/* crc32c(uuid+mmp_block) */
1799 };
1800 
1801 /* arguments passed to the mmp thread */
1802 struct mmpd_data {
1803 	struct buffer_head *bh; /* bh from initial read_mmp_block() */
1804 	struct super_block *sb;  /* super block of the fs */
1805 };
1806 
1807 /*
1808  * Check interval multiplier
1809  * The MMP block is written every update interval and initially checked every
1810  * update interval x the multiplier (the value is then adapted based on the
1811  * write latency). The reason is that writes can be delayed under load and we
1812  * don't want readers to incorrectly assume that the filesystem is no longer
1813  * in use.
1814  */
1815 #define EXT4_MMP_CHECK_MULT		2UL
1816 
1817 /*
1818  * Minimum interval for MMP checking in seconds.
1819  */
1820 #define EXT4_MMP_MIN_CHECK_INTERVAL	5UL
1821 
1822 /*
1823  * Maximum interval for MMP checking in seconds.
1824  */
1825 #define EXT4_MMP_MAX_CHECK_INTERVAL	300UL
1826 
1827 /*
1828  * Function prototypes
1829  */
1830 
1831 /*
1832  * Ok, these declarations are also in <linux/kernel.h> but none of the
1833  * ext4 source programs needs to include it so they are duplicated here.
1834  */
1835 # define NORET_TYPE	/**/
1836 # define ATTRIB_NORET	__attribute__((noreturn))
1837 # define NORET_AND	noreturn,
1838 
1839 /* bitmap.c */
1840 extern unsigned int ext4_count_free(struct buffer_head *, unsigned);
1841 
1842 /* balloc.c */
1843 extern unsigned int ext4_block_group(struct super_block *sb,
1844 			ext4_fsblk_t blocknr);
1845 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb,
1846 			ext4_fsblk_t blocknr);
1847 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group);
1848 extern unsigned long ext4_bg_num_gdb(struct super_block *sb,
1849 			ext4_group_t group);
1850 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,
1851 					 ext4_fsblk_t goal,
1852 					 unsigned int flags,
1853 					 unsigned long *count,
1854 					 int *errp);
1855 extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi,
1856 				    s64 nclusters, unsigned int flags);
1857 extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *);
1858 extern void ext4_check_blocks_bitmap(struct super_block *);
1859 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
1860 						    ext4_group_t block_group,
1861 						    struct buffer_head ** bh);
1862 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
1863 
1864 extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb,
1865 						ext4_group_t block_group);
1866 extern int ext4_wait_block_bitmap(struct super_block *sb,
1867 				  ext4_group_t block_group,
1868 				  struct buffer_head *bh);
1869 extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb,
1870 						  ext4_group_t block_group);
1871 extern void ext4_init_block_bitmap(struct super_block *sb,
1872 				   struct buffer_head *bh,
1873 				   ext4_group_t group,
1874 				   struct ext4_group_desc *desc);
1875 extern unsigned ext4_free_clusters_after_init(struct super_block *sb,
1876 					      ext4_group_t block_group,
1877 					      struct ext4_group_desc *gdp);
1878 extern unsigned ext4_num_overhead_clusters(struct super_block *sb,
1879 					   ext4_group_t block_group,
1880 					   struct ext4_group_desc *gdp);
1881 ext4_fsblk_t ext4_inode_to_goal_block(struct inode *);
1882 
1883 /* dir.c */
1884 extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *,
1885 				  struct file *,
1886 				  struct ext4_dir_entry_2 *,
1887 				  struct buffer_head *, unsigned int);
1888 #define ext4_check_dir_entry(dir, filp, de, bh, offset)			\
1889 	unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \
1890 					(de), (bh), (offset)))
1891 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
1892 				    __u32 minor_hash,
1893 				    struct ext4_dir_entry_2 *dirent);
1894 extern void ext4_htree_free_dir_info(struct dir_private_info *p);
1895 
1896 /* fsync.c */
1897 extern int ext4_sync_file(struct file *, loff_t, loff_t, int);
1898 extern int ext4_flush_completed_IO(struct inode *);
1899 
1900 /* hash.c */
1901 extern int ext4fs_dirhash(const char *name, int len, struct
1902 			  dx_hash_info *hinfo);
1903 
1904 /* ialloc.c */
1905 extern struct inode *ext4_new_inode(handle_t *, struct inode *, umode_t,
1906 				    const struct qstr *qstr, __u32 goal,
1907 				    uid_t *owner);
1908 extern void ext4_free_inode(handle_t *, struct inode *);
1909 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long);
1910 extern unsigned long ext4_count_free_inodes(struct super_block *);
1911 extern unsigned long ext4_count_dirs(struct super_block *);
1912 extern void ext4_check_inodes_bitmap(struct super_block *);
1913 extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap);
1914 extern int ext4_init_inode_table(struct super_block *sb,
1915 				 ext4_group_t group, int barrier);
1916 extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate);
1917 
1918 /* mballoc.c */
1919 extern long ext4_mb_stats;
1920 extern long ext4_mb_max_to_scan;
1921 extern int ext4_mb_init(struct super_block *, int);
1922 extern int ext4_mb_release(struct super_block *);
1923 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *,
1924 				struct ext4_allocation_request *, int *);
1925 extern int ext4_mb_reserve_blocks(struct super_block *, int);
1926 extern void ext4_discard_preallocations(struct inode *);
1927 extern int __init ext4_init_mballoc(void);
1928 extern void ext4_exit_mballoc(void);
1929 extern void ext4_free_blocks(handle_t *handle, struct inode *inode,
1930 			     struct buffer_head *bh, ext4_fsblk_t block,
1931 			     unsigned long count, int flags);
1932 extern int ext4_mb_add_groupinfo(struct super_block *sb,
1933 		ext4_group_t i, struct ext4_group_desc *desc);
1934 extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb,
1935 				ext4_fsblk_t block, unsigned long count);
1936 extern int ext4_trim_fs(struct super_block *, struct fstrim_range *);
1937 
1938 /* inode.c */
1939 struct buffer_head *ext4_getblk(handle_t *, struct inode *,
1940 						ext4_lblk_t, int, int *);
1941 struct buffer_head *ext4_bread(handle_t *, struct inode *,
1942 						ext4_lblk_t, int, int *);
1943 int ext4_get_block(struct inode *inode, sector_t iblock,
1944 				struct buffer_head *bh_result, int create);
1945 
1946 extern struct inode *ext4_iget(struct super_block *, unsigned long);
1947 extern int  ext4_write_inode(struct inode *, struct writeback_control *);
1948 extern int  ext4_setattr(struct dentry *, struct iattr *);
1949 extern int  ext4_getattr(struct vfsmount *mnt, struct dentry *dentry,
1950 				struct kstat *stat);
1951 extern void ext4_evict_inode(struct inode *);
1952 extern void ext4_clear_inode(struct inode *);
1953 extern int  ext4_sync_inode(handle_t *, struct inode *);
1954 extern void ext4_dirty_inode(struct inode *, int);
1955 extern int ext4_change_inode_journal_flag(struct inode *, int);
1956 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
1957 extern int ext4_can_truncate(struct inode *inode);
1958 extern void ext4_truncate(struct inode *);
1959 extern int ext4_punch_hole(struct file *file, loff_t offset, loff_t length);
1960 extern int ext4_truncate_restart_trans(handle_t *, struct inode *, int nblocks);
1961 extern void ext4_set_inode_flags(struct inode *);
1962 extern void ext4_get_inode_flags(struct ext4_inode_info *);
1963 extern int ext4_alloc_da_blocks(struct inode *inode);
1964 extern void ext4_set_aops(struct inode *inode);
1965 extern int ext4_writepage_trans_blocks(struct inode *);
1966 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks);
1967 extern int ext4_discard_partial_page_buffers(handle_t *handle,
1968 		struct address_space *mapping, loff_t from,
1969 		loff_t length, int flags);
1970 extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf);
1971 extern qsize_t *ext4_get_reserved_space(struct inode *inode);
1972 extern void ext4_da_update_reserve_space(struct inode *inode,
1973 					int used, int quota_claim);
1974 
1975 /* indirect.c */
1976 extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode,
1977 				struct ext4_map_blocks *map, int flags);
1978 extern ssize_t ext4_ind_direct_IO(int rw, struct kiocb *iocb,
1979 				const struct iovec *iov, loff_t offset,
1980 				unsigned long nr_segs);
1981 extern int ext4_ind_calc_metadata_amount(struct inode *inode, sector_t lblock);
1982 extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks, int chunk);
1983 extern void ext4_ind_truncate(struct inode *inode);
1984 
1985 /* ioctl.c */
1986 extern long ext4_ioctl(struct file *, unsigned int, unsigned long);
1987 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long);
1988 
1989 /* migrate.c */
1990 extern int ext4_ext_migrate(struct inode *);
1991 
1992 /* namei.c */
1993 extern int ext4_orphan_add(handle_t *, struct inode *);
1994 extern int ext4_orphan_del(handle_t *, struct inode *);
1995 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
1996 				__u32 start_minor_hash, __u32 *next_hash);
1997 
1998 /* resize.c */
1999 extern int ext4_group_add(struct super_block *sb,
2000 				struct ext4_new_group_data *input);
2001 extern int ext4_group_extend(struct super_block *sb,
2002 				struct ext4_super_block *es,
2003 				ext4_fsblk_t n_blocks_count);
2004 extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count);
2005 
2006 /* super.c */
2007 extern void *ext4_kvmalloc(size_t size, gfp_t flags);
2008 extern void *ext4_kvzalloc(size_t size, gfp_t flags);
2009 extern void ext4_kvfree(void *ptr);
2010 extern __printf(4, 5)
2011 void __ext4_error(struct super_block *, const char *, unsigned int,
2012 		  const char *, ...);
2013 #define ext4_error(sb, message...)	__ext4_error(sb, __func__,	\
2014 						     __LINE__, ## message)
2015 extern __printf(5, 6)
2016 void ext4_error_inode(struct inode *, const char *, unsigned int, ext4_fsblk_t,
2017 		      const char *, ...);
2018 extern __printf(5, 6)
2019 void ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t,
2020 		     const char *, ...);
2021 extern void __ext4_std_error(struct super_block *, const char *,
2022 			     unsigned int, int);
2023 extern __printf(4, 5)
2024 void __ext4_abort(struct super_block *, const char *, unsigned int,
2025 		  const char *, ...);
2026 #define ext4_abort(sb, message...)	__ext4_abort(sb, __func__, \
2027 						       __LINE__, ## message)
2028 extern __printf(4, 5)
2029 void __ext4_warning(struct super_block *, const char *, unsigned int,
2030 		    const char *, ...);
2031 #define ext4_warning(sb, message...)	__ext4_warning(sb, __func__, \
2032 						       __LINE__, ## message)
2033 extern __printf(3, 4)
2034 void ext4_msg(struct super_block *, const char *, const char *, ...);
2035 extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp,
2036 			   const char *, unsigned int, const char *);
2037 #define dump_mmp_msg(sb, mmp, msg)	__dump_mmp_msg(sb, mmp, __func__, \
2038 						       __LINE__, msg)
2039 extern __printf(7, 8)
2040 void __ext4_grp_locked_error(const char *, unsigned int,
2041 			     struct super_block *, ext4_group_t,
2042 			     unsigned long, ext4_fsblk_t,
2043 			     const char *, ...);
2044 #define ext4_grp_locked_error(sb, grp, message...) \
2045 	__ext4_grp_locked_error(__func__, __LINE__, (sb), (grp), ## message)
2046 extern void ext4_update_dynamic_rev(struct super_block *sb);
2047 extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb,
2048 					__u32 compat);
2049 extern int ext4_update_rocompat_feature(handle_t *handle,
2050 					struct super_block *sb,	__u32 rocompat);
2051 extern int ext4_update_incompat_feature(handle_t *handle,
2052 					struct super_block *sb,	__u32 incompat);
2053 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
2054 				      struct ext4_group_desc *bg);
2055 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
2056 				      struct ext4_group_desc *bg);
2057 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
2058 				     struct ext4_group_desc *bg);
2059 extern __u32 ext4_free_group_clusters(struct super_block *sb,
2060 				      struct ext4_group_desc *bg);
2061 extern __u32 ext4_free_inodes_count(struct super_block *sb,
2062 				 struct ext4_group_desc *bg);
2063 extern __u32 ext4_used_dirs_count(struct super_block *sb,
2064 				struct ext4_group_desc *bg);
2065 extern __u32 ext4_itable_unused_count(struct super_block *sb,
2066 				   struct ext4_group_desc *bg);
2067 extern void ext4_block_bitmap_set(struct super_block *sb,
2068 				  struct ext4_group_desc *bg, ext4_fsblk_t blk);
2069 extern void ext4_inode_bitmap_set(struct super_block *sb,
2070 				  struct ext4_group_desc *bg, ext4_fsblk_t blk);
2071 extern void ext4_inode_table_set(struct super_block *sb,
2072 				 struct ext4_group_desc *bg, ext4_fsblk_t blk);
2073 extern void ext4_free_group_clusters_set(struct super_block *sb,
2074 					 struct ext4_group_desc *bg,
2075 					 __u32 count);
2076 extern void ext4_free_inodes_set(struct super_block *sb,
2077 				struct ext4_group_desc *bg, __u32 count);
2078 extern void ext4_used_dirs_set(struct super_block *sb,
2079 				struct ext4_group_desc *bg, __u32 count);
2080 extern void ext4_itable_unused_set(struct super_block *sb,
2081 				   struct ext4_group_desc *bg, __u32 count);
2082 extern __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 group,
2083 				   struct ext4_group_desc *gdp);
2084 extern int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 group,
2085 				       struct ext4_group_desc *gdp);
2086 
2087 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
2088 {
2089 	return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) |
2090 		le32_to_cpu(es->s_blocks_count_lo);
2091 }
2092 
2093 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
2094 {
2095 	return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) |
2096 		le32_to_cpu(es->s_r_blocks_count_lo);
2097 }
2098 
2099 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
2100 {
2101 	return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) |
2102 		le32_to_cpu(es->s_free_blocks_count_lo);
2103 }
2104 
2105 static inline void ext4_blocks_count_set(struct ext4_super_block *es,
2106 					 ext4_fsblk_t blk)
2107 {
2108 	es->s_blocks_count_lo = cpu_to_le32((u32)blk);
2109 	es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
2110 }
2111 
2112 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
2113 					      ext4_fsblk_t blk)
2114 {
2115 	es->s_free_blocks_count_lo = cpu_to_le32((u32)blk);
2116 	es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
2117 }
2118 
2119 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
2120 					   ext4_fsblk_t blk)
2121 {
2122 	es->s_r_blocks_count_lo = cpu_to_le32((u32)blk);
2123 	es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
2124 }
2125 
2126 static inline loff_t ext4_isize(struct ext4_inode *raw_inode)
2127 {
2128 	if (S_ISREG(le16_to_cpu(raw_inode->i_mode)))
2129 		return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) |
2130 			le32_to_cpu(raw_inode->i_size_lo);
2131 	else
2132 		return (loff_t) le32_to_cpu(raw_inode->i_size_lo);
2133 }
2134 
2135 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size)
2136 {
2137 	raw_inode->i_size_lo = cpu_to_le32(i_size);
2138 	raw_inode->i_size_high = cpu_to_le32(i_size >> 32);
2139 }
2140 
2141 static inline
2142 struct ext4_group_info *ext4_get_group_info(struct super_block *sb,
2143 					    ext4_group_t group)
2144 {
2145 	 struct ext4_group_info ***grp_info;
2146 	 long indexv, indexh;
2147 	 grp_info = EXT4_SB(sb)->s_group_info;
2148 	 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb));
2149 	 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1);
2150 	 return grp_info[indexv][indexh];
2151 }
2152 
2153 /*
2154  * Reading s_groups_count requires using smp_rmb() afterwards.  See
2155  * the locking protocol documented in the comments of ext4_group_add()
2156  * in resize.c
2157  */
2158 static inline ext4_group_t ext4_get_groups_count(struct super_block *sb)
2159 {
2160 	ext4_group_t	ngroups = EXT4_SB(sb)->s_groups_count;
2161 
2162 	smp_rmb();
2163 	return ngroups;
2164 }
2165 
2166 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi,
2167 					     ext4_group_t block_group)
2168 {
2169 	return block_group >> sbi->s_log_groups_per_flex;
2170 }
2171 
2172 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi)
2173 {
2174 	return 1 << sbi->s_log_groups_per_flex;
2175 }
2176 
2177 #define ext4_std_error(sb, errno)				\
2178 do {								\
2179 	if ((errno))						\
2180 		__ext4_std_error((sb), __func__, __LINE__, (errno));	\
2181 } while (0)
2182 
2183 #ifdef CONFIG_SMP
2184 /* Each CPU can accumulate percpu_counter_batch clusters in their local
2185  * counters. So we need to make sure we have free clusters more
2186  * than percpu_counter_batch  * nr_cpu_ids. Also add a window of 4 times.
2187  */
2188 #define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids))
2189 #else
2190 #define EXT4_FREECLUSTERS_WATERMARK 0
2191 #endif
2192 
2193 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize)
2194 {
2195 	/*
2196 	 * XXX: replace with spinlock if seen contended -bzzz
2197 	 */
2198 	down_write(&EXT4_I(inode)->i_data_sem);
2199 	if (newsize > EXT4_I(inode)->i_disksize)
2200 		EXT4_I(inode)->i_disksize = newsize;
2201 	up_write(&EXT4_I(inode)->i_data_sem);
2202 	return ;
2203 }
2204 
2205 struct ext4_group_info {
2206 	unsigned long   bb_state;
2207 	struct rb_root  bb_free_root;
2208 	ext4_grpblk_t	bb_first_free;	/* first free block */
2209 	ext4_grpblk_t	bb_free;	/* total free blocks */
2210 	ext4_grpblk_t	bb_fragments;	/* nr of freespace fragments */
2211 	ext4_grpblk_t	bb_largest_free_order;/* order of largest frag in BG */
2212 	struct          list_head bb_prealloc_list;
2213 #ifdef DOUBLE_CHECK
2214 	void            *bb_bitmap;
2215 #endif
2216 	struct rw_semaphore alloc_sem;
2217 	ext4_grpblk_t	bb_counters[];	/* Nr of free power-of-two-block
2218 					 * regions, index is order.
2219 					 * bb_counters[3] = 5 means
2220 					 * 5 free 8-block regions. */
2221 };
2222 
2223 #define EXT4_GROUP_INFO_NEED_INIT_BIT		0
2224 #define EXT4_GROUP_INFO_WAS_TRIMMED_BIT		1
2225 
2226 #define EXT4_MB_GRP_NEED_INIT(grp)	\
2227 	(test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state)))
2228 
2229 #define EXT4_MB_GRP_WAS_TRIMMED(grp)	\
2230 	(test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2231 #define EXT4_MB_GRP_SET_TRIMMED(grp)	\
2232 	(set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2233 #define EXT4_MB_GRP_CLEAR_TRIMMED(grp)	\
2234 	(clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2235 
2236 #define EXT4_MAX_CONTENTION		8
2237 #define EXT4_CONTENTION_THRESHOLD	2
2238 
2239 static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb,
2240 					      ext4_group_t group)
2241 {
2242 	return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group);
2243 }
2244 
2245 /*
2246  * Returns true if the filesystem is busy enough that attempts to
2247  * access the block group locks has run into contention.
2248  */
2249 static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi)
2250 {
2251 	return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD);
2252 }
2253 
2254 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group)
2255 {
2256 	spinlock_t *lock = ext4_group_lock_ptr(sb, group);
2257 	if (spin_trylock(lock))
2258 		/*
2259 		 * We're able to grab the lock right away, so drop the
2260 		 * lock contention counter.
2261 		 */
2262 		atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0);
2263 	else {
2264 		/*
2265 		 * The lock is busy, so bump the contention counter,
2266 		 * and then wait on the spin lock.
2267 		 */
2268 		atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1,
2269 				  EXT4_MAX_CONTENTION);
2270 		spin_lock(lock);
2271 	}
2272 }
2273 
2274 static inline void ext4_unlock_group(struct super_block *sb,
2275 					ext4_group_t group)
2276 {
2277 	spin_unlock(ext4_group_lock_ptr(sb, group));
2278 }
2279 
2280 static inline void ext4_mark_super_dirty(struct super_block *sb)
2281 {
2282 	if (EXT4_SB(sb)->s_journal == NULL)
2283 		sb->s_dirt =1;
2284 }
2285 
2286 /*
2287  * Block validity checking
2288  */
2289 #define ext4_check_indirect_blockref(inode, bh)				\
2290 	ext4_check_blockref(__func__, __LINE__, inode,			\
2291 			    (__le32 *)(bh)->b_data,			\
2292 			    EXT4_ADDR_PER_BLOCK((inode)->i_sb))
2293 
2294 #define ext4_ind_check_inode(inode)					\
2295 	ext4_check_blockref(__func__, __LINE__, inode,			\
2296 			    EXT4_I(inode)->i_data,			\
2297 			    EXT4_NDIR_BLOCKS)
2298 
2299 /*
2300  * Inodes and files operations
2301  */
2302 
2303 /* dir.c */
2304 extern const struct file_operations ext4_dir_operations;
2305 
2306 /* file.c */
2307 extern const struct inode_operations ext4_file_inode_operations;
2308 extern const struct file_operations ext4_file_operations;
2309 extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin);
2310 
2311 /* namei.c */
2312 extern const struct inode_operations ext4_dir_inode_operations;
2313 extern const struct inode_operations ext4_special_inode_operations;
2314 extern struct dentry *ext4_get_parent(struct dentry *child);
2315 
2316 /* symlink.c */
2317 extern const struct inode_operations ext4_symlink_inode_operations;
2318 extern const struct inode_operations ext4_fast_symlink_inode_operations;
2319 
2320 /* block_validity */
2321 extern void ext4_release_system_zone(struct super_block *sb);
2322 extern int ext4_setup_system_zone(struct super_block *sb);
2323 extern int __init ext4_init_system_zone(void);
2324 extern void ext4_exit_system_zone(void);
2325 extern int ext4_data_block_valid(struct ext4_sb_info *sbi,
2326 				 ext4_fsblk_t start_blk,
2327 				 unsigned int count);
2328 extern int ext4_check_blockref(const char *, unsigned int,
2329 			       struct inode *, __le32 *, unsigned int);
2330 
2331 /* extents.c */
2332 extern int ext4_ext_tree_init(handle_t *handle, struct inode *);
2333 extern int ext4_ext_writepage_trans_blocks(struct inode *, int);
2334 extern int ext4_ext_index_trans_blocks(struct inode *inode, int nrblocks,
2335 				       int chunk);
2336 extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
2337 			       struct ext4_map_blocks *map, int flags);
2338 extern void ext4_ext_truncate(struct inode *);
2339 extern int ext4_ext_punch_hole(struct file *file, loff_t offset,
2340 				loff_t length);
2341 extern void ext4_ext_init(struct super_block *);
2342 extern void ext4_ext_release(struct super_block *);
2343 extern long ext4_fallocate(struct file *file, int mode, loff_t offset,
2344 			  loff_t len);
2345 extern int ext4_convert_unwritten_extents(struct inode *inode, loff_t offset,
2346 			  ssize_t len);
2347 extern int ext4_map_blocks(handle_t *handle, struct inode *inode,
2348 			   struct ext4_map_blocks *map, int flags);
2349 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
2350 			__u64 start, __u64 len);
2351 /* move_extent.c */
2352 extern int ext4_move_extents(struct file *o_filp, struct file *d_filp,
2353 			     __u64 start_orig, __u64 start_donor,
2354 			     __u64 len, __u64 *moved_len);
2355 
2356 /* page-io.c */
2357 extern int __init ext4_init_pageio(void);
2358 extern void ext4_exit_pageio(void);
2359 extern void ext4_ioend_wait(struct inode *);
2360 extern void ext4_free_io_end(ext4_io_end_t *io);
2361 extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags);
2362 extern int ext4_end_io_nolock(ext4_io_end_t *io);
2363 extern void ext4_io_submit(struct ext4_io_submit *io);
2364 extern int ext4_bio_write_page(struct ext4_io_submit *io,
2365 			       struct page *page,
2366 			       int len,
2367 			       struct writeback_control *wbc);
2368 
2369 /* mmp.c */
2370 extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t);
2371 
2372 /* BH_Uninit flag: blocks are allocated but uninitialized on disk */
2373 enum ext4_state_bits {
2374 	BH_Uninit	/* blocks are allocated but uninitialized on disk */
2375 	  = BH_JBDPrivateStart,
2376 	BH_AllocFromCluster,	/* allocated blocks were part of already
2377 				 * allocated cluster. Note that this flag will
2378 				 * never, ever appear in a buffer_head's state
2379 				 * flag. See EXT4_MAP_FROM_CLUSTER to see where
2380 				 * this is used. */
2381 	BH_Da_Mapped,	/* Delayed allocated block that now has a mapping. This
2382 			 * flag is set when ext4_map_blocks is called on a
2383 			 * delayed allocated block to get its real mapping. */
2384 };
2385 
2386 BUFFER_FNS(Uninit, uninit)
2387 TAS_BUFFER_FNS(Uninit, uninit)
2388 BUFFER_FNS(Da_Mapped, da_mapped)
2389 
2390 /*
2391  * Add new method to test wether block and inode bitmaps are properly
2392  * initialized. With uninit_bg reading the block from disk is not enough
2393  * to mark the bitmap uptodate. We need to also zero-out the bitmap
2394  */
2395 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart
2396 
2397 static inline int bitmap_uptodate(struct buffer_head *bh)
2398 {
2399 	return (buffer_uptodate(bh) &&
2400 			test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state));
2401 }
2402 static inline void set_bitmap_uptodate(struct buffer_head *bh)
2403 {
2404 	set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state);
2405 }
2406 
2407 #define in_range(b, first, len)	((b) >= (first) && (b) <= (first) + (len) - 1)
2408 
2409 /* For ioend & aio unwritten conversion wait queues */
2410 #define EXT4_WQ_HASH_SZ		37
2411 #define ext4_ioend_wq(v)   (&ext4__ioend_wq[((unsigned long)(v)) %\
2412 					    EXT4_WQ_HASH_SZ])
2413 #define ext4_aio_mutex(v)  (&ext4__aio_mutex[((unsigned long)(v)) %\
2414 					     EXT4_WQ_HASH_SZ])
2415 extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
2416 extern struct mutex ext4__aio_mutex[EXT4_WQ_HASH_SZ];
2417 
2418 #define EXT4_RESIZING	0
2419 extern int ext4_resize_begin(struct super_block *sb);
2420 extern void ext4_resize_end(struct super_block *sb);
2421 
2422 #endif	/* __KERNEL__ */
2423 
2424 #include "ext4_extents.h"
2425 
2426 #endif	/* _EXT4_H */
2427