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ext4: remove unused ext4_sb_info members
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / fs / ext4 / ext4.h
blob22833691e98c2b6424c7e0986fab4ac9c4ca5aaf
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 #ifdef __KERNEL__
33 #include <linux/compat.h>
34 #endif
35
36 /*
37 * The fourth extended filesystem constants/structures
38 */
39
40 /*
41 * Define EXT4FS_DEBUG to produce debug messages
42 */
43 #undef EXT4FS_DEBUG
44
45 /*
46 * Debug code
47 */
48 #ifdef EXT4FS_DEBUG
49 #define ext4_debug(f, a...) \
50 do { \
51 printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \
52 __FILE__, __LINE__, __func__); \
53 printk(KERN_DEBUG f, ## a); \
54 } while (0)
55 #else
56 #define ext4_debug(f, a...) do {} while (0)
57 #endif
58
59 #define EXT4_ERROR_INODE(inode, fmt, a...) \
60 ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a)
61
62 #define EXT4_ERROR_INODE_BLOCK(inode, block, fmt, a...) \
63 ext4_error_inode((inode), __func__, __LINE__, (block), (fmt), ## a)
64
65 #define EXT4_ERROR_FILE(file, fmt, a...) \
66 ext4_error_file(__func__, __LINE__, (file), (fmt), ## a)
67
68 /* data type for block offset of block group */
69 typedef int ext4_grpblk_t;
70
71 /* data type for filesystem-wide blocks number */
72 typedef unsigned long long ext4_fsblk_t;
73
74 /* data type for file logical block number */
75 typedef __u32 ext4_lblk_t;
76
77 /* data type for block group number */
78 typedef unsigned int ext4_group_t;
79
80 /*
81 * Flags used in mballoc's allocation_context flags field.
82 *
83 * Also used to show what's going on for debugging purposes when the
84 * flag field is exported via the traceport interface
85 */
86
87 /* prefer goal again. length */
88 #define EXT4_MB_HINT_MERGE 0x0001
89 /* blocks already reserved */
90 #define EXT4_MB_HINT_RESERVED 0x0002
91 /* metadata is being allocated */
92 #define EXT4_MB_HINT_METADATA 0x0004
93 /* first blocks in the file */
94 #define EXT4_MB_HINT_FIRST 0x0008
95 /* search for the best chunk */
96 #define EXT4_MB_HINT_BEST 0x0010
97 /* data is being allocated */
98 #define EXT4_MB_HINT_DATA 0x0020
99 /* don't preallocate (for tails) */
100 #define EXT4_MB_HINT_NOPREALLOC 0x0040
101 /* allocate for locality group */
102 #define EXT4_MB_HINT_GROUP_ALLOC 0x0080
103 /* allocate goal blocks or none */
104 #define EXT4_MB_HINT_GOAL_ONLY 0x0100
105 /* goal is meaningful */
106 #define EXT4_MB_HINT_TRY_GOAL 0x0200
107 /* blocks already pre-reserved by delayed allocation */
108 #define EXT4_MB_DELALLOC_RESERVED 0x0400
109 /* We are doing stream allocation */
110 #define EXT4_MB_STREAM_ALLOC 0x0800
111
112
113 struct ext4_allocation_request {
114 /* target inode for block we're allocating */
115 struct inode *inode;
116 /* how many blocks we want to allocate */
117 unsigned int len;
118 /* logical block in target inode */
119 ext4_lblk_t logical;
120 /* the closest logical allocated block to the left */
121 ext4_lblk_t lleft;
122 /* the closest logical allocated block to the right */
123 ext4_lblk_t lright;
124 /* phys. target (a hint) */
125 ext4_fsblk_t goal;
126 /* phys. block for the closest logical allocated block to the left */
127 ext4_fsblk_t pleft;
128 /* phys. block for the closest logical allocated block to the right */
129 ext4_fsblk_t pright;
130 /* flags. see above EXT4_MB_HINT_* */
131 unsigned int flags;
132 };
133
134 /*
135 * Logical to physical block mapping, used by ext4_map_blocks()
136 *
137 * This structure is used to pass requests into ext4_map_blocks() as
138 * well as to store the information returned by ext4_map_blocks(). It
139 * takes less room on the stack than a struct buffer_head.
140 */
141 #define EXT4_MAP_NEW (1 << BH_New)
142 #define EXT4_MAP_MAPPED (1 << BH_Mapped)
143 #define EXT4_MAP_UNWRITTEN (1 << BH_Unwritten)
144 #define EXT4_MAP_BOUNDARY (1 << BH_Boundary)
145 #define EXT4_MAP_UNINIT (1 << BH_Uninit)
146 #define EXT4_MAP_FLAGS (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\
147 EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY |\
148 EXT4_MAP_UNINIT)
149
150 struct ext4_map_blocks {
151 ext4_fsblk_t m_pblk;
152 ext4_lblk_t m_lblk;
153 unsigned int m_len;
154 unsigned int m_flags;
155 };
156
157 /*
158 * For delayed allocation tracking
159 */
160 struct mpage_da_data {
161 struct inode *inode;
162 sector_t b_blocknr; /* start block number of extent */
163 size_t b_size; /* size of extent */
164 unsigned long b_state; /* state of the extent */
165 unsigned long first_page, next_page; /* extent of pages */
166 struct writeback_control *wbc;
167 int io_done;
168 int pages_written;
169 int retval;
170 };
171 #define EXT4_IO_UNWRITTEN 0x1
172 typedef struct ext4_io_end {
173 struct list_head list; /* per-file finished IO list */
174 struct inode *inode; /* file being written to */
175 unsigned int flag; /* unwritten or not */
176 struct page *page; /* page struct for buffer write */
177 loff_t offset; /* offset in the file */
178 ssize_t size; /* size of the extent */
179 struct work_struct work; /* data work queue */
180 struct kiocb *iocb; /* iocb struct for AIO */
181 int result; /* error value for AIO */
182 } ext4_io_end_t;
183
184 /*
185 * Special inodes numbers
186 */
187 #define EXT4_BAD_INO 1 /* Bad blocks inode */
188 #define EXT4_ROOT_INO 2 /* Root inode */
189 #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */
190 #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */
191 #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */
192 #define EXT4_JOURNAL_INO 8 /* Journal inode */
193
194 /* First non-reserved inode for old ext4 filesystems */
195 #define EXT4_GOOD_OLD_FIRST_INO 11
196
197 /*
198 * Maximal count of links to a file
199 */
200 #define EXT4_LINK_MAX 65000
201
202 /*
203 * Macro-instructions used to manage several block sizes
204 */
205 #define EXT4_MIN_BLOCK_SIZE 1024
206 #define EXT4_MAX_BLOCK_SIZE 65536
207 #define EXT4_MIN_BLOCK_LOG_SIZE 10
208 #define EXT4_MAX_BLOCK_LOG_SIZE 16
209 #ifdef __KERNEL__
210 # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize)
211 #else
212 # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
213 #endif
214 #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32))
215 #ifdef __KERNEL__
216 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits)
217 #else
218 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10)
219 #endif
220 #ifdef __KERNEL__
221 #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits)
222 #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size)
223 #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino)
224 #else
225 #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
226 EXT4_GOOD_OLD_INODE_SIZE : \
227 (s)->s_inode_size)
228 #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
229 EXT4_GOOD_OLD_FIRST_INO : \
230 (s)->s_first_ino)
231 #endif
232 #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits)))
233
234 /*
235 * Structure of a blocks group descriptor
236 */
237 struct ext4_group_desc
238 {
239 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */
240 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */
241 __le32 bg_inode_table_lo; /* Inodes table block */
242 __le16 bg_free_blocks_count_lo;/* Free blocks count */
243 __le16 bg_free_inodes_count_lo;/* Free inodes count */
244 __le16 bg_used_dirs_count_lo; /* Directories count */
245 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */
246 __u32 bg_reserved[2]; /* Likely block/inode bitmap checksum */
247 __le16 bg_itable_unused_lo; /* Unused inodes count */
248 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */
249 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */
250 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */
251 __le32 bg_inode_table_hi; /* Inodes table block MSB */
252 __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */
253 __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */
254 __le16 bg_used_dirs_count_hi; /* Directories count MSB */
255 __le16 bg_itable_unused_hi; /* Unused inodes count MSB */
256 __u32 bg_reserved2[3];
257 };
258
259 /*
260 * Structure of a flex block group info
261 */
262
263 struct flex_groups {
264 atomic_t free_inodes;
265 atomic_t free_blocks;
266 atomic_t used_dirs;
267 };
268
269 #define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */
270 #define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */
271 #define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */
272
273 /*
274 * Macro-instructions used to manage group descriptors
275 */
276 #define EXT4_MIN_DESC_SIZE 32
277 #define EXT4_MIN_DESC_SIZE_64BIT 64
278 #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE
279 #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size)
280 #ifdef __KERNEL__
281 # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group)
282 # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block)
283 # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group)
284 # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits)
285 #else
286 # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group)
287 # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
288 # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group)
289 #endif
290
291 /*
292 * Constants relative to the data blocks
293 */
294 #define EXT4_NDIR_BLOCKS 12
295 #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS
296 #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1)
297 #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1)
298 #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1)
299
300 /*
301 * Inode flags
302 */
303 #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */
304 #define EXT4_UNRM_FL 0x00000002 /* Undelete */
305 #define EXT4_COMPR_FL 0x00000004 /* Compress file */
306 #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */
307 #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */
308 #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */
309 #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */
310 #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */
311 /* Reserved for compression usage... */
312 #define EXT4_DIRTY_FL 0x00000100
313 #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
314 #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */
315 #define EXT4_ECOMPR_FL 0x00000800 /* Compression error */
316 /* End compression flags --- maybe not all used */
317 #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */
318 #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */
319 #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */
320 #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */
321 #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
322 #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
323 #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */
324 #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */
325 #define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */
326 #define EXT4_EOFBLOCKS_FL 0x00400000 /* Blocks allocated beyond EOF */
327 #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */
328
329 #define EXT4_FL_USER_VISIBLE 0x004BDFFF /* User visible flags */
330 #define EXT4_FL_USER_MODIFIABLE 0x004B80FF /* User modifiable flags */
331
332 /* Flags that should be inherited by new inodes from their parent. */
333 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\
334 EXT4_SYNC_FL | EXT4_IMMUTABLE_FL | EXT4_APPEND_FL |\
335 EXT4_NODUMP_FL | EXT4_NOATIME_FL |\
336 EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\
337 EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL)
338
339 /* Flags that are appropriate for regular files (all but dir-specific ones). */
340 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL))
341
342 /* Flags that are appropriate for non-directories/regular files. */
343 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL)
344
345 /* Mask out flags that are inappropriate for the given type of inode. */
346 static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags)
347 {
348 if (S_ISDIR(mode))
349 return flags;
350 else if (S_ISREG(mode))
351 return flags & EXT4_REG_FLMASK;
352 else
353 return flags & EXT4_OTHER_FLMASK;
354 }
355
356 /*
357 * Inode flags used for atomic set/get
358 */
359 enum {
360 EXT4_INODE_SECRM = 0, /* Secure deletion */
361 EXT4_INODE_UNRM = 1, /* Undelete */
362 EXT4_INODE_COMPR = 2, /* Compress file */
363 EXT4_INODE_SYNC = 3, /* Synchronous updates */
364 EXT4_INODE_IMMUTABLE = 4, /* Immutable file */
365 EXT4_INODE_APPEND = 5, /* writes to file may only append */
366 EXT4_INODE_NODUMP = 6, /* do not dump file */
367 EXT4_INODE_NOATIME = 7, /* do not update atime */
368 /* Reserved for compression usage... */
369 EXT4_INODE_DIRTY = 8,
370 EXT4_INODE_COMPRBLK = 9, /* One or more compressed clusters */
371 EXT4_INODE_NOCOMPR = 10, /* Don't compress */
372 EXT4_INODE_ECOMPR = 11, /* Compression error */
373 /* End compression flags --- maybe not all used */
374 EXT4_INODE_INDEX = 12, /* hash-indexed directory */
375 EXT4_INODE_IMAGIC = 13, /* AFS directory */
376 EXT4_INODE_JOURNAL_DATA = 14, /* file data should be journaled */
377 EXT4_INODE_NOTAIL = 15, /* file tail should not be merged */
378 EXT4_INODE_DIRSYNC = 16, /* dirsync behaviour (directories only) */
379 EXT4_INODE_TOPDIR = 17, /* Top of directory hierarchies*/
380 EXT4_INODE_HUGE_FILE = 18, /* Set to each huge file */
381 EXT4_INODE_EXTENTS = 19, /* Inode uses extents */
382 EXT4_INODE_EA_INODE = 21, /* Inode used for large EA */
383 EXT4_INODE_EOFBLOCKS = 22, /* Blocks allocated beyond EOF */
384 EXT4_INODE_RESERVED = 31, /* reserved for ext4 lib */
385 };
386
387 #define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG))
388 #define CHECK_FLAG_VALUE(FLAG) if (!TEST_FLAG_VALUE(FLAG)) { \
389 printk(KERN_EMERG "EXT4 flag fail: " #FLAG ": %d %d\n", \
390 EXT4_##FLAG##_FL, EXT4_INODE_##FLAG); BUG_ON(1); }
391
392 /*
393 * Since it's pretty easy to mix up bit numbers and hex values, and we
394 * can't do a compile-time test for ENUM values, we use a run-time
395 * test to make sure that EXT4_XXX_FL is consistent with respect to
396 * EXT4_INODE_XXX. If all is well the printk and BUG_ON will all drop
397 * out so it won't cost any extra space in the compiled kernel image.
398 * But it's important that these values are the same, since we are
399 * using EXT4_INODE_XXX to test for the flag values, but EXT4_XX_FL
400 * must be consistent with the values of FS_XXX_FL defined in
401 * include/linux/fs.h and the on-disk values found in ext2, ext3, and
402 * ext4 filesystems, and of course the values defined in e2fsprogs.
403 *
404 * It's not paranoia if the Murphy's Law really *is* out to get you. :-)
405 */
406 static inline void ext4_check_flag_values(void)
407 {
408 CHECK_FLAG_VALUE(SECRM);
409 CHECK_FLAG_VALUE(UNRM);
410 CHECK_FLAG_VALUE(COMPR);
411 CHECK_FLAG_VALUE(SYNC);
412 CHECK_FLAG_VALUE(IMMUTABLE);
413 CHECK_FLAG_VALUE(APPEND);
414 CHECK_FLAG_VALUE(NODUMP);
415 CHECK_FLAG_VALUE(NOATIME);
416 CHECK_FLAG_VALUE(DIRTY);
417 CHECK_FLAG_VALUE(COMPRBLK);
418 CHECK_FLAG_VALUE(NOCOMPR);
419 CHECK_FLAG_VALUE(ECOMPR);
420 CHECK_FLAG_VALUE(INDEX);
421 CHECK_FLAG_VALUE(IMAGIC);
422 CHECK_FLAG_VALUE(JOURNAL_DATA);
423 CHECK_FLAG_VALUE(NOTAIL);
424 CHECK_FLAG_VALUE(DIRSYNC);
425 CHECK_FLAG_VALUE(TOPDIR);
426 CHECK_FLAG_VALUE(HUGE_FILE);
427 CHECK_FLAG_VALUE(EXTENTS);
428 CHECK_FLAG_VALUE(EA_INODE);
429 CHECK_FLAG_VALUE(EOFBLOCKS);
430 CHECK_FLAG_VALUE(RESERVED);
431 }
432
433 /* Used to pass group descriptor data when online resize is done */
434 struct ext4_new_group_input {
435 __u32 group; /* Group number for this data */
436 __u64 block_bitmap; /* Absolute block number of block bitmap */
437 __u64 inode_bitmap; /* Absolute block number of inode bitmap */
438 __u64 inode_table; /* Absolute block number of inode table start */
439 __u32 blocks_count; /* Total number of blocks in this group */
440 __u16 reserved_blocks; /* Number of reserved blocks in this group */
441 __u16 unused;
442 };
443
444 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
445 struct compat_ext4_new_group_input {
446 u32 group;
447 compat_u64 block_bitmap;
448 compat_u64 inode_bitmap;
449 compat_u64 inode_table;
450 u32 blocks_count;
451 u16 reserved_blocks;
452 u16 unused;
453 };
454 #endif
455
456 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */
457 struct ext4_new_group_data {
458 __u32 group;
459 __u64 block_bitmap;
460 __u64 inode_bitmap;
461 __u64 inode_table;
462 __u32 blocks_count;
463 __u16 reserved_blocks;
464 __u16 unused;
465 __u32 free_blocks_count;
466 };
467
468 /*
469 * Flags used by ext4_map_blocks()
470 */
471 /* Allocate any needed blocks and/or convert an unitialized
472 extent to be an initialized ext4 */
473 #define EXT4_GET_BLOCKS_CREATE 0x0001
474 /* Request the creation of an unitialized extent */
475 #define EXT4_GET_BLOCKS_UNINIT_EXT 0x0002
476 #define EXT4_GET_BLOCKS_CREATE_UNINIT_EXT (EXT4_GET_BLOCKS_UNINIT_EXT|\
477 EXT4_GET_BLOCKS_CREATE)
478 /* Caller is from the delayed allocation writeout path,
479 so set the magic i_delalloc_reserve_flag after taking the
480 inode allocation semaphore for */
481 #define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004
482 /* caller is from the direct IO path, request to creation of an
483 unitialized extents if not allocated, split the uninitialized
484 extent if blocks has been preallocated already*/
485 #define EXT4_GET_BLOCKS_PRE_IO 0x0008
486 #define EXT4_GET_BLOCKS_CONVERT 0x0010
487 #define EXT4_GET_BLOCKS_IO_CREATE_EXT (EXT4_GET_BLOCKS_PRE_IO|\
488 EXT4_GET_BLOCKS_CREATE_UNINIT_EXT)
489 /* Convert extent to initialized after IO complete */
490 #define EXT4_GET_BLOCKS_IO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT|\
491 EXT4_GET_BLOCKS_CREATE_UNINIT_EXT)
492
493 /*
494 * Flags used by ext4_free_blocks
495 */
496 #define EXT4_FREE_BLOCKS_METADATA 0x0001
497 #define EXT4_FREE_BLOCKS_FORGET 0x0002
498 #define EXT4_FREE_BLOCKS_VALIDATED 0x0004
499
500 /*
501 * ioctl commands
502 */
503 #define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS
504 #define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS
505 #define EXT4_IOC_GETVERSION _IOR('f', 3, long)
506 #define EXT4_IOC_SETVERSION _IOW('f', 4, long)
507 #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION
508 #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION
509 #ifdef CONFIG_JBD2_DEBUG
510 #define EXT4_IOC_WAIT_FOR_READONLY _IOR('f', 99, long)
511 #endif
512 #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long)
513 #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long)
514 #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long)
515 #define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input)
516 #define EXT4_IOC_MIGRATE _IO('f', 9)
517 /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */
518 /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */
519 #define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12)
520 #define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent)
521
522 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
523 /*
524 * ioctl commands in 32 bit emulation
525 */
526 #define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS
527 #define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS
528 #define EXT4_IOC32_GETVERSION _IOR('f', 3, int)
529 #define EXT4_IOC32_SETVERSION _IOW('f', 4, int)
530 #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int)
531 #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int)
532 #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int)
533 #define EXT4_IOC32_GROUP_ADD _IOW('f', 8, struct compat_ext4_new_group_input)
534 #ifdef CONFIG_JBD2_DEBUG
535 #define EXT4_IOC32_WAIT_FOR_READONLY _IOR('f', 99, int)
536 #endif
537 #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION
538 #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION
539 #endif
540
541
542 /*
543 * Mount options
544 */
545 struct ext4_mount_options {
546 unsigned long s_mount_opt;
547 uid_t s_resuid;
548 gid_t s_resgid;
549 unsigned long s_commit_interval;
550 u32 s_min_batch_time, s_max_batch_time;
551 #ifdef CONFIG_QUOTA
552 int s_jquota_fmt;
553 char *s_qf_names[MAXQUOTAS];
554 #endif
555 };
556
557 /* Max physical block we can addres w/o extents */
558 #define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF
559
560 /*
561 * Structure of an inode on the disk
562 */
563 struct ext4_inode {
564 __le16 i_mode; /* File mode */
565 __le16 i_uid; /* Low 16 bits of Owner Uid */
566 __le32 i_size_lo; /* Size in bytes */
567 __le32 i_atime; /* Access time */
568 __le32 i_ctime; /* Inode Change time */
569 __le32 i_mtime; /* Modification time */
570 __le32 i_dtime; /* Deletion Time */
571 __le16 i_gid; /* Low 16 bits of Group Id */
572 __le16 i_links_count; /* Links count */
573 __le32 i_blocks_lo; /* Blocks count */
574 __le32 i_flags; /* File flags */
575 union {
576 struct {
577 __le32 l_i_version;
578 } linux1;
579 struct {
580 __u32 h_i_translator;
581 } hurd1;
582 struct {
583 __u32 m_i_reserved1;
584 } masix1;
585 } osd1; /* OS dependent 1 */
586 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
587 __le32 i_generation; /* File version (for NFS) */
588 __le32 i_file_acl_lo; /* File ACL */
589 __le32 i_size_high;
590 __le32 i_obso_faddr; /* Obsoleted fragment address */
591 union {
592 struct {
593 __le16 l_i_blocks_high; /* were l_i_reserved1 */
594 __le16 l_i_file_acl_high;
595 __le16 l_i_uid_high; /* these 2 fields */
596 __le16 l_i_gid_high; /* were reserved2[0] */
597 __u32 l_i_reserved2;
598 } linux2;
599 struct {
600 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
601 __u16 h_i_mode_high;
602 __u16 h_i_uid_high;
603 __u16 h_i_gid_high;
604 __u32 h_i_author;
605 } hurd2;
606 struct {
607 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
608 __le16 m_i_file_acl_high;
609 __u32 m_i_reserved2[2];
610 } masix2;
611 } osd2; /* OS dependent 2 */
612 __le16 i_extra_isize;
613 __le16 i_pad1;
614 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */
615 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */
616 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */
617 __le32 i_crtime; /* File Creation time */
618 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */
619 __le32 i_version_hi; /* high 32 bits for 64-bit version */
620 };
621
622 struct move_extent {
623 __u32 reserved; /* should be zero */
624 __u32 donor_fd; /* donor file descriptor */
625 __u64 orig_start; /* logical start offset in block for orig */
626 __u64 donor_start; /* logical start offset in block for donor */
627 __u64 len; /* block length to be moved */
628 __u64 moved_len; /* moved block length */
629 };
630
631 #define EXT4_EPOCH_BITS 2
632 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
633 #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS)
634
635 /*
636 * Extended fields will fit into an inode if the filesystem was formatted
637 * with large inodes (-I 256 or larger) and there are not currently any EAs
638 * consuming all of the available space. For new inodes we always reserve
639 * enough space for the kernel's known extended fields, but for inodes
640 * created with an old kernel this might not have been the case. None of
641 * the extended inode fields is critical for correct filesystem operation.
642 * This macro checks if a certain field fits in the inode. Note that
643 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
644 */
645 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \
646 ((offsetof(typeof(*ext4_inode), field) + \
647 sizeof((ext4_inode)->field)) \
648 <= (EXT4_GOOD_OLD_INODE_SIZE + \
649 (einode)->i_extra_isize)) \
650
651 static inline __le32 ext4_encode_extra_time(struct timespec *time)
652 {
653 return cpu_to_le32((sizeof(time->tv_sec) > 4 ?
654 (time->tv_sec >> 32) & EXT4_EPOCH_MASK : 0) |
655 ((time->tv_nsec << EXT4_EPOCH_BITS) & EXT4_NSEC_MASK));
656 }
657
658 static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra)
659 {
660 if (sizeof(time->tv_sec) > 4)
661 time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK)
662 << 32;
663 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS;
664 }
665
666 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \
667 do { \
668 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \
669 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
670 (raw_inode)->xtime ## _extra = \
671 ext4_encode_extra_time(&(inode)->xtime); \
672 } while (0)
673
674 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \
675 do { \
676 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
677 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \
678 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
679 (raw_inode)->xtime ## _extra = \
680 ext4_encode_extra_time(&(einode)->xtime); \
681 } while (0)
682
683 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \
684 do { \
685 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \
686 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
687 ext4_decode_extra_time(&(inode)->xtime, \
688 raw_inode->xtime ## _extra); \
689 } while (0)
690
691 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \
692 do { \
693 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
694 (einode)->xtime.tv_sec = \
695 (signed)le32_to_cpu((raw_inode)->xtime); \
696 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
697 ext4_decode_extra_time(&(einode)->xtime, \
698 raw_inode->xtime ## _extra); \
699 } while (0)
700
701 #define i_disk_version osd1.linux1.l_i_version
702
703 #if defined(__KERNEL__) || defined(__linux__)
704 #define i_reserved1 osd1.linux1.l_i_reserved1
705 #define i_file_acl_high osd2.linux2.l_i_file_acl_high
706 #define i_blocks_high osd2.linux2.l_i_blocks_high
707 #define i_uid_low i_uid
708 #define i_gid_low i_gid
709 #define i_uid_high osd2.linux2.l_i_uid_high
710 #define i_gid_high osd2.linux2.l_i_gid_high
711 #define i_reserved2 osd2.linux2.l_i_reserved2
712
713 #elif defined(__GNU__)
714
715 #define i_translator osd1.hurd1.h_i_translator
716 #define i_uid_high osd2.hurd2.h_i_uid_high
717 #define i_gid_high osd2.hurd2.h_i_gid_high
718 #define i_author osd2.hurd2.h_i_author
719
720 #elif defined(__masix__)
721
722 #define i_reserved1 osd1.masix1.m_i_reserved1
723 #define i_file_acl_high osd2.masix2.m_i_file_acl_high
724 #define i_reserved2 osd2.masix2.m_i_reserved2
725
726 #endif /* defined(__KERNEL__) || defined(__linux__) */
727
728 /*
729 * storage for cached extent
730 */
731 struct ext4_ext_cache {
732 ext4_fsblk_t ec_start;
733 ext4_lblk_t ec_block;
734 __u32 ec_len; /* must be 32bit to return holes */
735 __u32 ec_type;
736 };
737
738 /*
739 * fourth extended file system inode data in memory
740 */
741 struct ext4_inode_info {
742 __le32 i_data[15]; /* unconverted */
743 __u32 i_dtime;
744 ext4_fsblk_t i_file_acl;
745
746 /*
747 * i_block_group is the number of the block group which contains
748 * this file's inode. Constant across the lifetime of the inode,
749 * it is ued for making block allocation decisions - we try to
750 * place a file's data blocks near its inode block, and new inodes
751 * near to their parent directory's inode.
752 */
753 ext4_group_t i_block_group;
754 unsigned long i_state_flags; /* Dynamic state flags */
755 unsigned long i_flags;
756
757 ext4_lblk_t i_dir_start_lookup;
758 #ifdef CONFIG_EXT4_FS_XATTR
759 /*
760 * Extended attributes can be read independently of the main file
761 * data. Taking i_mutex even when reading would cause contention
762 * between readers of EAs and writers of regular file data, so
763 * instead we synchronize on xattr_sem when reading or changing
764 * EAs.
765 */
766 struct rw_semaphore xattr_sem;
767 #endif
768
769 struct list_head i_orphan; /* unlinked but open inodes */
770
771 /*
772 * i_disksize keeps track of what the inode size is ON DISK, not
773 * in memory. During truncate, i_size is set to the new size by
774 * the VFS prior to calling ext4_truncate(), but the filesystem won't
775 * set i_disksize to 0 until the truncate is actually under way.
776 *
777 * The intent is that i_disksize always represents the blocks which
778 * are used by this file. This allows recovery to restart truncate
779 * on orphans if we crash during truncate. We actually write i_disksize
780 * into the on-disk inode when writing inodes out, instead of i_size.
781 *
782 * The only time when i_disksize and i_size may be different is when
783 * a truncate is in progress. The only things which change i_disksize
784 * are ext4_get_block (growth) and ext4_truncate (shrinkth).
785 */
786 loff_t i_disksize;
787
788 /*
789 * i_data_sem is for serialising ext4_truncate() against
790 * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's
791 * data tree are chopped off during truncate. We can't do that in
792 * ext4 because whenever we perform intermediate commits during
793 * truncate, the inode and all the metadata blocks *must* be in a
794 * consistent state which allows truncation of the orphans to restart
795 * during recovery. Hence we must fix the get_block-vs-truncate race
796 * by other means, so we have i_data_sem.
797 */
798 struct rw_semaphore i_data_sem;
799 struct inode vfs_inode;
800 struct jbd2_inode jinode;
801
802 struct ext4_ext_cache i_cached_extent;
803 /*
804 * File creation time. Its function is same as that of
805 * struct timespec i_{a,c,m}time in the generic inode.
806 */
807 struct timespec i_crtime;
808
809 /* mballoc */
810 struct list_head i_prealloc_list;
811 spinlock_t i_prealloc_lock;
812
813 /* ialloc */
814 ext4_group_t i_last_alloc_group;
815
816 /* allocation reservation info for delalloc */
817 unsigned int i_reserved_data_blocks;
818 unsigned int i_reserved_meta_blocks;
819 unsigned int i_allocated_meta_blocks;
820 unsigned short i_delalloc_reserved_flag;
821 sector_t i_da_metadata_calc_last_lblock;
822 int i_da_metadata_calc_len;
823
824 /* on-disk additional length */
825 __u16 i_extra_isize;
826
827 spinlock_t i_block_reservation_lock;
828 #ifdef CONFIG_QUOTA
829 /* quota space reservation, managed internally by quota code */
830 qsize_t i_reserved_quota;
831 #endif
832
833 /* completed IOs that might need unwritten extents handling */
834 struct list_head i_completed_io_list;
835 spinlock_t i_completed_io_lock;
836 /* current io_end structure for async DIO write*/
837 ext4_io_end_t *cur_aio_dio;
838
839 /*
840 * Transactions that contain inode's metadata needed to complete
841 * fsync and fdatasync, respectively.
842 */
843 tid_t i_sync_tid;
844 tid_t i_datasync_tid;
845 };
846
847 /*
848 * File system states
849 */
850 #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */
851 #define EXT4_ERROR_FS 0x0002 /* Errors detected */
852 #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */
853
854 /*
855 * Misc. filesystem flags
856 */
857 #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */
858 #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */
859 #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */
860
861 /*
862 * Mount flags
863 */
864 #define EXT4_MOUNT_OLDALLOC 0x00002 /* Don't use the new Orlov allocator */
865 #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */
866 #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */
867 #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */
868 #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */
869 #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */
870 #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */
871 #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/
872 #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */
873 #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */
874 #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */
875 #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */
876 #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */
877 #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */
878 #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */
879 #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */
880 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */
881 #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */
882 #define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */
883 #define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */
884 #define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */
885 #define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000 /* Enable support for dio read nolocking */
886 #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */
887 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */
888 #define EXT4_MOUNT_I_VERSION 0x2000000 /* i_version support */
889 #define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */
890 #define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */
891 #define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */
892 #define EXT4_MOUNT_DISCARD 0x40000000 /* Issue DISCARD requests */
893 #define EXT4_MOUNT_INIT_INODE_TABLE 0x80000000 /* Initialize uninitialized itables */
894
895 #define clear_opt(o, opt) o &= ~EXT4_MOUNT_##opt
896 #define set_opt(o, opt) o |= EXT4_MOUNT_##opt
897 #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \
898 EXT4_MOUNT_##opt)
899
900 #define ext4_set_bit ext2_set_bit
901 #define ext4_set_bit_atomic ext2_set_bit_atomic
902 #define ext4_clear_bit ext2_clear_bit
903 #define ext4_clear_bit_atomic ext2_clear_bit_atomic
904 #define ext4_test_bit ext2_test_bit
905 #define ext4_find_first_zero_bit ext2_find_first_zero_bit
906 #define ext4_find_next_zero_bit ext2_find_next_zero_bit
907 #define ext4_find_next_bit ext2_find_next_bit
908
909 /*
910 * Maximal mount counts between two filesystem checks
911 */
912 #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
913 #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */
914
915 /*
916 * Behaviour when detecting errors
917 */
918 #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */
919 #define EXT4_ERRORS_RO 2 /* Remount fs read-only */
920 #define EXT4_ERRORS_PANIC 3 /* Panic */
921 #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE
922
923 /*
924 * Structure of the super block
925 */
926 struct ext4_super_block {
927 /*00*/ __le32 s_inodes_count; /* Inodes count */
928 __le32 s_blocks_count_lo; /* Blocks count */
929 __le32 s_r_blocks_count_lo; /* Reserved blocks count */
930 __le32 s_free_blocks_count_lo; /* Free blocks count */
931 /*10*/ __le32 s_free_inodes_count; /* Free inodes count */
932 __le32 s_first_data_block; /* First Data Block */
933 __le32 s_log_block_size; /* Block size */
934 __le32 s_obso_log_frag_size; /* Obsoleted fragment size */
935 /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */
936 __le32 s_obso_frags_per_group; /* Obsoleted fragments per group */
937 __le32 s_inodes_per_group; /* # Inodes per group */
938 __le32 s_mtime; /* Mount time */
939 /*30*/ __le32 s_wtime; /* Write time */
940 __le16 s_mnt_count; /* Mount count */
941 __le16 s_max_mnt_count; /* Maximal mount count */
942 __le16 s_magic; /* Magic signature */
943 __le16 s_state; /* File system state */
944 __le16 s_errors; /* Behaviour when detecting errors */
945 __le16 s_minor_rev_level; /* minor revision level */
946 /*40*/ __le32 s_lastcheck; /* time of last check */
947 __le32 s_checkinterval; /* max. time between checks */
948 __le32 s_creator_os; /* OS */
949 __le32 s_rev_level; /* Revision level */
950 /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */
951 __le16 s_def_resgid; /* Default gid for reserved blocks */
952 /*
953 * These fields are for EXT4_DYNAMIC_REV superblocks only.
954 *
955 * Note: the difference between the compatible feature set and
956 * the incompatible feature set is that if there is a bit set
957 * in the incompatible feature set that the kernel doesn't
958 * know about, it should refuse to mount the filesystem.
959 *
960 * e2fsck's requirements are more strict; if it doesn't know
961 * about a feature in either the compatible or incompatible
962 * feature set, it must abort and not try to meddle with
963 * things it doesn't understand...
964 */
965 __le32 s_first_ino; /* First non-reserved inode */
966 __le16 s_inode_size; /* size of inode structure */
967 __le16 s_block_group_nr; /* block group # of this superblock */
968 __le32 s_feature_compat; /* compatible feature set */
969 /*60*/ __le32 s_feature_incompat; /* incompatible feature set */
970 __le32 s_feature_ro_compat; /* readonly-compatible feature set */
971 /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */
972 /*78*/ char s_volume_name[16]; /* volume name */
973 /*88*/ char s_last_mounted[64]; /* directory where last mounted */
974 /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */
975 /*
976 * Performance hints. Directory preallocation should only
977 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
978 */
979 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/
980 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */
981 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */
982 /*
983 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
984 */
985 /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */
986 /*E0*/ __le32 s_journal_inum; /* inode number of journal file */
987 __le32 s_journal_dev; /* device number of journal file */
988 __le32 s_last_orphan; /* start of list of inodes to delete */
989 __le32 s_hash_seed[4]; /* HTREE hash seed */
990 __u8 s_def_hash_version; /* Default hash version to use */
991 __u8 s_jnl_backup_type;
992 __le16 s_desc_size; /* size of group descriptor */
993 /*100*/ __le32 s_default_mount_opts;
994 __le32 s_first_meta_bg; /* First metablock block group */
995 __le32 s_mkfs_time; /* When the filesystem was created */
996 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */
997 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
998 /*150*/ __le32 s_blocks_count_hi; /* Blocks count */
999 __le32 s_r_blocks_count_hi; /* Reserved blocks count */
1000 __le32 s_free_blocks_count_hi; /* Free blocks count */
1001 __le16 s_min_extra_isize; /* All inodes have at least # bytes */
1002 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */
1003 __le32 s_flags; /* Miscellaneous flags */
1004 __le16 s_raid_stride; /* RAID stride */
1005 __le16 s_mmp_interval; /* # seconds to wait in MMP checking */
1006 __le64 s_mmp_block; /* Block for multi-mount protection */
1007 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/
1008 __u8 s_log_groups_per_flex; /* FLEX_BG group size */
1009 __u8 s_reserved_char_pad;
1010 __le16 s_reserved_pad;
1011 __le64 s_kbytes_written; /* nr of lifetime kilobytes written */
1012 __le32 s_snapshot_inum; /* Inode number of active snapshot */
1013 __le32 s_snapshot_id; /* sequential ID of active snapshot */
1014 __le64 s_snapshot_r_blocks_count; /* reserved blocks for active
1015 snapshot's future use */
1016 __le32 s_snapshot_list; /* inode number of the head of the
1017 on-disk snapshot list */
1018 #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count)
1019 __le32 s_error_count; /* number of fs errors */
1020 __le32 s_first_error_time; /* first time an error happened */
1021 __le32 s_first_error_ino; /* inode involved in first error */
1022 __le64 s_first_error_block; /* block involved of first error */
1023 __u8 s_first_error_func[32]; /* function where the error happened */
1024 __le32 s_first_error_line; /* line number where error happened */
1025 __le32 s_last_error_time; /* most recent time of an error */
1026 __le32 s_last_error_ino; /* inode involved in last error */
1027 __le32 s_last_error_line; /* line number where error happened */
1028 __le64 s_last_error_block; /* block involved of last error */
1029 __u8 s_last_error_func[32]; /* function where the error happened */
1030 #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts)
1031 __u8 s_mount_opts[64];
1032 __le32 s_reserved[112]; /* Padding to the end of the block */
1033 };
1034
1035 #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START)
1036
1037 #ifdef __KERNEL__
1038
1039 /*
1040 * run-time mount flags
1041 */
1042 #define EXT4_MF_MNTDIR_SAMPLED 0x0001
1043 #define EXT4_MF_FS_ABORTED 0x0002 /* Fatal error detected */
1044
1045 /*
1046 * fourth extended-fs super-block data in memory
1047 */
1048 struct ext4_sb_info {
1049 unsigned long s_desc_size; /* Size of a group descriptor in bytes */
1050 unsigned long s_inodes_per_block;/* Number of inodes per block */
1051 unsigned long s_blocks_per_group;/* Number of blocks in a group */
1052 unsigned long s_inodes_per_group;/* Number of inodes in a group */
1053 unsigned long s_itb_per_group; /* Number of inode table blocks per group */
1054 unsigned long s_gdb_count; /* Number of group descriptor blocks */
1055 unsigned long s_desc_per_block; /* Number of group descriptors per block */
1056 ext4_group_t s_groups_count; /* Number of groups in the fs */
1057 ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */
1058 unsigned long s_overhead_last; /* Last calculated overhead */
1059 unsigned long s_blocks_last; /* Last seen block count */
1060 loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */
1061 struct buffer_head * s_sbh; /* Buffer containing the super block */
1062 struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */
1063 struct buffer_head **s_group_desc;
1064 unsigned int s_mount_opt;
1065 unsigned int s_mount_flags;
1066 ext4_fsblk_t s_sb_block;
1067 uid_t s_resuid;
1068 gid_t s_resgid;
1069 unsigned short s_mount_state;
1070 unsigned short s_pad;
1071 int s_addr_per_block_bits;
1072 int s_desc_per_block_bits;
1073 int s_inode_size;
1074 int s_first_ino;
1075 unsigned int s_inode_readahead_blks;
1076 unsigned int s_inode_goal;
1077 spinlock_t s_next_gen_lock;
1078 u32 s_next_generation;
1079 u32 s_hash_seed[4];
1080 int s_def_hash_version;
1081 int s_hash_unsigned; /* 3 if hash should be signed, 0 if not */
1082 struct percpu_counter s_freeblocks_counter;
1083 struct percpu_counter s_freeinodes_counter;
1084 struct percpu_counter s_dirs_counter;
1085 struct percpu_counter s_dirtyblocks_counter;
1086 struct blockgroup_lock *s_blockgroup_lock;
1087 struct proc_dir_entry *s_proc;
1088 struct kobject s_kobj;
1089 struct completion s_kobj_unregister;
1090
1091 /* Journaling */
1092 struct journal_s *s_journal;
1093 struct list_head s_orphan;
1094 struct mutex s_orphan_lock;
1095 struct mutex s_resize_lock;
1096 unsigned long s_commit_interval;
1097 u32 s_max_batch_time;
1098 u32 s_min_batch_time;
1099 struct block_device *journal_bdev;
1100 #ifdef CONFIG_JBD2_DEBUG
1101 struct timer_list turn_ro_timer; /* For turning read-only (crash simulation) */
1102 wait_queue_head_t ro_wait_queue; /* For people waiting for the fs to go read-only */
1103 #endif
1104 #ifdef CONFIG_QUOTA
1105 char *s_qf_names[MAXQUOTAS]; /* Names of quota files with journalled quota */
1106 int s_jquota_fmt; /* Format of quota to use */
1107 #endif
1108 unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */
1109 struct rb_root system_blks;
1110
1111 #ifdef EXTENTS_STATS
1112 /* ext4 extents stats */
1113 unsigned long s_ext_min;
1114 unsigned long s_ext_max;
1115 unsigned long s_depth_max;
1116 spinlock_t s_ext_stats_lock;
1117 unsigned long s_ext_blocks;
1118 unsigned long s_ext_extents;
1119 #endif
1120
1121 /* for buddy allocator */
1122 struct ext4_group_info ***s_group_info;
1123 struct inode *s_buddy_cache;
1124 spinlock_t s_md_lock;
1125 unsigned short *s_mb_offsets;
1126 unsigned int *s_mb_maxs;
1127
1128 /* tunables */
1129 unsigned long s_stripe;
1130 unsigned int s_mb_stream_request;
1131 unsigned int s_mb_max_to_scan;
1132 unsigned int s_mb_min_to_scan;
1133 unsigned int s_mb_stats;
1134 unsigned int s_mb_order2_reqs;
1135 unsigned int s_mb_group_prealloc;
1136 unsigned int s_max_writeback_mb_bump;
1137 /* where last allocation was done - for stream allocation */
1138 unsigned long s_mb_last_group;
1139 unsigned long s_mb_last_start;
1140
1141 /* stats for buddy allocator */
1142 atomic_t s_bal_reqs; /* number of reqs with len > 1 */
1143 atomic_t s_bal_success; /* we found long enough chunks */
1144 atomic_t s_bal_allocated; /* in blocks */
1145 atomic_t s_bal_ex_scanned; /* total extents scanned */
1146 atomic_t s_bal_goals; /* goal hits */
1147 atomic_t s_bal_breaks; /* too long searches */
1148 atomic_t s_bal_2orders; /* 2^order hits */
1149 spinlock_t s_bal_lock;
1150 unsigned long s_mb_buddies_generated;
1151 unsigned long long s_mb_generation_time;
1152 atomic_t s_mb_lost_chunks;
1153 atomic_t s_mb_preallocated;
1154 atomic_t s_mb_discarded;
1155 atomic_t s_lock_busy;
1156
1157 /* locality groups */
1158 struct ext4_locality_group __percpu *s_locality_groups;
1159
1160 /* for write statistics */
1161 unsigned long s_sectors_written_start;
1162 u64 s_kbytes_written;
1163
1164 unsigned int s_log_groups_per_flex;
1165 struct flex_groups *s_flex_groups;
1166
1167 /* workqueue for dio unwritten */
1168 struct workqueue_struct *dio_unwritten_wq;
1169
1170 /* timer for periodic error stats printing */
1171 struct timer_list s_err_report;
1172
1173 /* Lazy inode table initialization info */
1174 struct ext4_li_request *s_li_request;
1175 /* Wait multiplier for lazy initialization thread */
1176 unsigned int s_li_wait_mult;
1177 };
1178
1179 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb)
1180 {
1181 return sb->s_fs_info;
1182 }
1183 static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
1184 {
1185 return container_of(inode, struct ext4_inode_info, vfs_inode);
1186 }
1187
1188 static inline struct timespec ext4_current_time(struct inode *inode)
1189 {
1190 return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ?
1191 current_fs_time(inode->i_sb) : CURRENT_TIME_SEC;
1192 }
1193
1194 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
1195 {
1196 return ino == EXT4_ROOT_INO ||
1197 ino == EXT4_JOURNAL_INO ||
1198 ino == EXT4_RESIZE_INO ||
1199 (ino >= EXT4_FIRST_INO(sb) &&
1200 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
1201 }
1202
1203 /*
1204 * Inode dynamic state flags
1205 */
1206 enum {
1207 EXT4_STATE_JDATA, /* journaled data exists */
1208 EXT4_STATE_NEW, /* inode is newly created */
1209 EXT4_STATE_XATTR, /* has in-inode xattrs */
1210 EXT4_STATE_NO_EXPAND, /* No space for expansion */
1211 EXT4_STATE_DA_ALLOC_CLOSE, /* Alloc DA blks on close */
1212 EXT4_STATE_EXT_MIGRATE, /* Inode is migrating */
1213 EXT4_STATE_DIO_UNWRITTEN, /* need convert on dio done*/
1214 EXT4_STATE_NEWENTRY, /* File just added to dir */
1215 };
1216
1217 #define EXT4_INODE_BIT_FNS(name, field) \
1218 static inline int ext4_test_inode_##name(struct inode *inode, int bit) \
1219 { \
1220 return test_bit(bit, &EXT4_I(inode)->i_##field); \
1221 } \
1222 static inline void ext4_set_inode_##name(struct inode *inode, int bit) \
1223 { \
1224 set_bit(bit, &EXT4_I(inode)->i_##field); \
1225 } \
1226 static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \
1227 { \
1228 clear_bit(bit, &EXT4_I(inode)->i_##field); \
1229 }
1230
1231 EXT4_INODE_BIT_FNS(flag, flags)
1232 EXT4_INODE_BIT_FNS(state, state_flags)
1233 #else
1234 /* Assume that user mode programs are passing in an ext4fs superblock, not
1235 * a kernel struct super_block. This will allow us to call the feature-test
1236 * macros from user land. */
1237 #define EXT4_SB(sb) (sb)
1238 #endif
1239
1240 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
1241
1242 /*
1243 * Codes for operating systems
1244 */
1245 #define EXT4_OS_LINUX 0
1246 #define EXT4_OS_HURD 1
1247 #define EXT4_OS_MASIX 2
1248 #define EXT4_OS_FREEBSD 3
1249 #define EXT4_OS_LITES 4
1250
1251 /*
1252 * Revision levels
1253 */
1254 #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */
1255 #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
1256
1257 #define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV
1258 #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV
1259
1260 #define EXT4_GOOD_OLD_INODE_SIZE 128
1261
1262 /*
1263 * Feature set definitions
1264 */
1265
1266 #define EXT4_HAS_COMPAT_FEATURE(sb,mask) \
1267 ((EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask)) != 0)
1268 #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \
1269 ((EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask)) != 0)
1270 #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \
1271 ((EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask)) != 0)
1272 #define EXT4_SET_COMPAT_FEATURE(sb,mask) \
1273 EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
1274 #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \
1275 EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
1276 #define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \
1277 EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
1278 #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \
1279 EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
1280 #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \
1281 EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
1282 #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \
1283 EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
1284
1285 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001
1286 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002
1287 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004
1288 #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008
1289 #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010
1290 #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020
1291
1292 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
1293 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
1294 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
1295 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008
1296 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010
1297 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020
1298 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040
1299
1300 #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001
1301 #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002
1302 #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */
1303 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */
1304 #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010
1305 #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */
1306 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080
1307 #define EXT4_FEATURE_INCOMPAT_MMP 0x0100
1308 #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200
1309 #define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 /* EA in inode */
1310 #define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 /* data in dirent */
1311
1312 #define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR
1313 #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1314 EXT4_FEATURE_INCOMPAT_RECOVER| \
1315 EXT4_FEATURE_INCOMPAT_META_BG| \
1316 EXT4_FEATURE_INCOMPAT_EXTENTS| \
1317 EXT4_FEATURE_INCOMPAT_64BIT| \
1318 EXT4_FEATURE_INCOMPAT_FLEX_BG)
1319 #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1320 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1321 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
1322 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
1323 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
1324 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
1325 EXT4_FEATURE_RO_COMPAT_HUGE_FILE)
1326
1327 /*
1328 * Default values for user and/or group using reserved blocks
1329 */
1330 #define EXT4_DEF_RESUID 0
1331 #define EXT4_DEF_RESGID 0
1332
1333 #define EXT4_DEF_INODE_READAHEAD_BLKS 32
1334
1335 /*
1336 * Default mount options
1337 */
1338 #define EXT4_DEFM_DEBUG 0x0001
1339 #define EXT4_DEFM_BSDGROUPS 0x0002
1340 #define EXT4_DEFM_XATTR_USER 0x0004
1341 #define EXT4_DEFM_ACL 0x0008
1342 #define EXT4_DEFM_UID16 0x0010
1343 #define EXT4_DEFM_JMODE 0x0060
1344 #define EXT4_DEFM_JMODE_DATA 0x0020
1345 #define EXT4_DEFM_JMODE_ORDERED 0x0040
1346 #define EXT4_DEFM_JMODE_WBACK 0x0060
1347 #define EXT4_DEFM_NOBARRIER 0x0100
1348 #define EXT4_DEFM_BLOCK_VALIDITY 0x0200
1349 #define EXT4_DEFM_DISCARD 0x0400
1350 #define EXT4_DEFM_NODELALLOC 0x0800
1351
1352 /*
1353 * Default journal batch times
1354 */
1355 #define EXT4_DEF_MIN_BATCH_TIME 0
1356 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */
1357
1358 /*
1359 * Minimum number of groups in a flexgroup before we separate out
1360 * directories into the first block group of a flexgroup
1361 */
1362 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4
1363
1364 /*
1365 * Structure of a directory entry
1366 */
1367 #define EXT4_NAME_LEN 255
1368
1369 struct ext4_dir_entry {
1370 __le32 inode; /* Inode number */
1371 __le16 rec_len; /* Directory entry length */
1372 __le16 name_len; /* Name length */
1373 char name[EXT4_NAME_LEN]; /* File name */
1374 };
1375
1376 /*
1377 * The new version of the directory entry. Since EXT4 structures are
1378 * stored in intel byte order, and the name_len field could never be
1379 * bigger than 255 chars, it's safe to reclaim the extra byte for the
1380 * file_type field.
1381 */
1382 struct ext4_dir_entry_2 {
1383 __le32 inode; /* Inode number */
1384 __le16 rec_len; /* Directory entry length */
1385 __u8 name_len; /* Name length */
1386 __u8 file_type;
1387 char name[EXT4_NAME_LEN]; /* File name */
1388 };
1389
1390 /*
1391 * Ext4 directory file types. Only the low 3 bits are used. The
1392 * other bits are reserved for now.
1393 */
1394 #define EXT4_FT_UNKNOWN 0
1395 #define EXT4_FT_REG_FILE 1
1396 #define EXT4_FT_DIR 2
1397 #define EXT4_FT_CHRDEV 3
1398 #define EXT4_FT_BLKDEV 4
1399 #define EXT4_FT_FIFO 5
1400 #define EXT4_FT_SOCK 6
1401 #define EXT4_FT_SYMLINK 7
1402
1403 #define EXT4_FT_MAX 8
1404
1405 /*
1406 * EXT4_DIR_PAD defines the directory entries boundaries
1407 *
1408 * NOTE: It must be a multiple of 4
1409 */
1410 #define EXT4_DIR_PAD 4
1411 #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1)
1412 #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \
1413 ~EXT4_DIR_ROUND)
1414 #define EXT4_MAX_REC_LEN ((1<<16)-1)
1415
1416 /*
1417 * If we ever get support for fs block sizes > page_size, we'll need
1418 * to remove the #if statements in the next two functions...
1419 */
1420 static inline unsigned int
1421 ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize)
1422 {
1423 unsigned len = le16_to_cpu(dlen);
1424
1425 #if (PAGE_CACHE_SIZE >= 65536)
1426 if (len == EXT4_MAX_REC_LEN || len == 0)
1427 return blocksize;
1428 return (len & 65532) | ((len & 3) << 16);
1429 #else
1430 return len;
1431 #endif
1432 }
1433
1434 static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize)
1435 {
1436 if ((len > blocksize) || (blocksize > (1 << 18)) || (len & 3))
1437 BUG();
1438 #if (PAGE_CACHE_SIZE >= 65536)
1439 if (len < 65536)
1440 return cpu_to_le16(len);
1441 if (len == blocksize) {
1442 if (blocksize == 65536)
1443 return cpu_to_le16(EXT4_MAX_REC_LEN);
1444 else
1445 return cpu_to_le16(0);
1446 }
1447 return cpu_to_le16((len & 65532) | ((len >> 16) & 3));
1448 #else
1449 return cpu_to_le16(len);
1450 #endif
1451 }
1452
1453 /*
1454 * Hash Tree Directory indexing
1455 * (c) Daniel Phillips, 2001
1456 */
1457
1458 #define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \
1459 EXT4_FEATURE_COMPAT_DIR_INDEX) && \
1460 ext4_test_inode_flag((dir), EXT4_INODE_INDEX))
1461 #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX)
1462 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
1463
1464 /* Legal values for the dx_root hash_version field: */
1465
1466 #define DX_HASH_LEGACY 0
1467 #define DX_HASH_HALF_MD4 1
1468 #define DX_HASH_TEA 2
1469 #define DX_HASH_LEGACY_UNSIGNED 3
1470 #define DX_HASH_HALF_MD4_UNSIGNED 4
1471 #define DX_HASH_TEA_UNSIGNED 5
1472
1473 #ifdef __KERNEL__
1474
1475 /* hash info structure used by the directory hash */
1476 struct dx_hash_info
1477 {
1478 u32 hash;
1479 u32 minor_hash;
1480 int hash_version;
1481 u32 *seed;
1482 };
1483
1484 #define EXT4_HTREE_EOF 0x7fffffff
1485
1486 /*
1487 * Control parameters used by ext4_htree_next_block
1488 */
1489 #define HASH_NB_ALWAYS 1
1490
1491
1492 /*
1493 * Describe an inode's exact location on disk and in memory
1494 */
1495 struct ext4_iloc
1496 {
1497 struct buffer_head *bh;
1498 unsigned long offset;
1499 ext4_group_t block_group;
1500 };
1501
1502 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
1503 {
1504 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
1505 }
1506
1507 /*
1508 * This structure is stuffed into the struct file's private_data field
1509 * for directories. It is where we put information so that we can do
1510 * readdir operations in hash tree order.
1511 */
1512 struct dir_private_info {
1513 struct rb_root root;
1514 struct rb_node *curr_node;
1515 struct fname *extra_fname;
1516 loff_t last_pos;
1517 __u32 curr_hash;
1518 __u32 curr_minor_hash;
1519 __u32 next_hash;
1520 };
1521
1522 /* calculate the first block number of the group */
1523 static inline ext4_fsblk_t
1524 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no)
1525 {
1526 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
1527 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
1528 }
1529
1530 /*
1531 * Special error return code only used by dx_probe() and its callers.
1532 */
1533 #define ERR_BAD_DX_DIR -75000
1534
1535 void ext4_get_group_no_and_offset(struct super_block *sb, ext4_fsblk_t blocknr,
1536 ext4_group_t *blockgrpp, ext4_grpblk_t *offsetp);
1537
1538 extern struct proc_dir_entry *ext4_proc_root;
1539
1540 /*
1541 * Timeout and state flag for lazy initialization inode thread.
1542 */
1543 #define EXT4_DEF_LI_WAIT_MULT 10
1544 #define EXT4_DEF_LI_MAX_START_DELAY 5
1545 #define EXT4_LAZYINIT_QUIT 0x0001
1546 #define EXT4_LAZYINIT_RUNNING 0x0002
1547
1548 /*
1549 * Lazy inode table initialization info
1550 */
1551 struct ext4_lazy_init {
1552 unsigned long li_state;
1553
1554 wait_queue_head_t li_wait_daemon;
1555 wait_queue_head_t li_wait_task;
1556 struct timer_list li_timer;
1557 struct task_struct *li_task;
1558
1559 struct list_head li_request_list;
1560 struct mutex li_list_mtx;
1561 };
1562
1563 struct ext4_li_request {
1564 struct super_block *lr_super;
1565 struct ext4_sb_info *lr_sbi;
1566 ext4_group_t lr_next_group;
1567 struct list_head lr_request;
1568 unsigned long lr_next_sched;
1569 unsigned long lr_timeout;
1570 };
1571
1572 struct ext4_features {
1573 struct kobject f_kobj;
1574 struct completion f_kobj_unregister;
1575 };
1576
1577 /*
1578 * Function prototypes
1579 */
1580
1581 /*
1582 * Ok, these declarations are also in <linux/kernel.h> but none of the
1583 * ext4 source programs needs to include it so they are duplicated here.
1584 */
1585 # define NORET_TYPE /**/
1586 # define ATTRIB_NORET __attribute__((noreturn))
1587 # define NORET_AND noreturn,
1588
1589 /* bitmap.c */
1590 extern unsigned int ext4_count_free(struct buffer_head *, unsigned);
1591
1592 /* balloc.c */
1593 extern unsigned int ext4_block_group(struct super_block *sb,
1594 ext4_fsblk_t blocknr);
1595 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb,
1596 ext4_fsblk_t blocknr);
1597 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group);
1598 extern unsigned long ext4_bg_num_gdb(struct super_block *sb,
1599 ext4_group_t group);
1600 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,
1601 ext4_fsblk_t goal, unsigned long *count, int *errp);
1602 extern int ext4_claim_free_blocks(struct ext4_sb_info *sbi, s64 nblocks);
1603 extern int ext4_has_free_blocks(struct ext4_sb_info *sbi, s64 nblocks);
1604 extern void ext4_add_groupblocks(handle_t *handle, struct super_block *sb,
1605 ext4_fsblk_t block, unsigned long count);
1606 extern ext4_fsblk_t ext4_count_free_blocks(struct super_block *);
1607 extern void ext4_check_blocks_bitmap(struct super_block *);
1608 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
1609 ext4_group_t block_group,
1610 struct buffer_head ** bh);
1611 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
1612 struct buffer_head *ext4_read_block_bitmap(struct super_block *sb,
1613 ext4_group_t block_group);
1614 extern unsigned ext4_init_block_bitmap(struct super_block *sb,
1615 struct buffer_head *bh,
1616 ext4_group_t group,
1617 struct ext4_group_desc *desc);
1618 #define ext4_free_blocks_after_init(sb, group, desc) \
1619 ext4_init_block_bitmap(sb, NULL, group, desc)
1620
1621 /* dir.c */
1622 extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *,
1623 struct ext4_dir_entry_2 *,
1624 struct buffer_head *, unsigned int);
1625 #define ext4_check_dir_entry(dir, de, bh, offset) \
1626 __ext4_check_dir_entry(__func__, __LINE__, (dir), (de), (bh), (offset))
1627 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
1628 __u32 minor_hash,
1629 struct ext4_dir_entry_2 *dirent);
1630 extern void ext4_htree_free_dir_info(struct dir_private_info *p);
1631
1632 /* fsync.c */
1633 extern int ext4_sync_file(struct file *, int);
1634
1635 /* hash.c */
1636 extern int ext4fs_dirhash(const char *name, int len, struct
1637 dx_hash_info *hinfo);
1638
1639 /* ialloc.c */
1640 extern struct inode *ext4_new_inode(handle_t *, struct inode *, int,
1641 const struct qstr *qstr, __u32 goal);
1642 extern void ext4_free_inode(handle_t *, struct inode *);
1643 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long);
1644 extern unsigned long ext4_count_free_inodes(struct super_block *);
1645 extern unsigned long ext4_count_dirs(struct super_block *);
1646 extern void ext4_check_inodes_bitmap(struct super_block *);
1647 extern unsigned ext4_init_inode_bitmap(struct super_block *sb,
1648 struct buffer_head *bh,
1649 ext4_group_t group,
1650 struct ext4_group_desc *desc);
1651 extern void mark_bitmap_end(int start_bit, int end_bit, char *bitmap);
1652 extern int ext4_init_inode_table(struct super_block *sb,
1653 ext4_group_t group, int barrier);
1654
1655 /* mballoc.c */
1656 extern long ext4_mb_stats;
1657 extern long ext4_mb_max_to_scan;
1658 extern int ext4_mb_init(struct super_block *, int);
1659 extern int ext4_mb_release(struct super_block *);
1660 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *,
1661 struct ext4_allocation_request *, int *);
1662 extern int ext4_mb_reserve_blocks(struct super_block *, int);
1663 extern void ext4_discard_preallocations(struct inode *);
1664 extern int __init init_ext4_mballoc(void);
1665 extern void exit_ext4_mballoc(void);
1666 extern void ext4_free_blocks(handle_t *handle, struct inode *inode,
1667 struct buffer_head *bh, ext4_fsblk_t block,
1668 unsigned long count, int flags);
1669 extern int ext4_mb_add_groupinfo(struct super_block *sb,
1670 ext4_group_t i, struct ext4_group_desc *desc);
1671 extern int ext4_mb_get_buddy_cache_lock(struct super_block *, ext4_group_t);
1672 extern void ext4_mb_put_buddy_cache_lock(struct super_block *,
1673 ext4_group_t, int);
1674 /* inode.c */
1675 struct buffer_head *ext4_getblk(handle_t *, struct inode *,
1676 ext4_lblk_t, int, int *);
1677 struct buffer_head *ext4_bread(handle_t *, struct inode *,
1678 ext4_lblk_t, int, int *);
1679 int ext4_get_block(struct inode *inode, sector_t iblock,
1680 struct buffer_head *bh_result, int create);
1681
1682 extern struct inode *ext4_iget(struct super_block *, unsigned long);
1683 extern int ext4_write_inode(struct inode *, struct writeback_control *);
1684 extern int ext4_setattr(struct dentry *, struct iattr *);
1685 extern int ext4_getattr(struct vfsmount *mnt, struct dentry *dentry,
1686 struct kstat *stat);
1687 extern void ext4_evict_inode(struct inode *);
1688 extern void ext4_clear_inode(struct inode *);
1689 extern int ext4_sync_inode(handle_t *, struct inode *);
1690 extern void ext4_dirty_inode(struct inode *);
1691 extern int ext4_change_inode_journal_flag(struct inode *, int);
1692 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
1693 extern int ext4_can_truncate(struct inode *inode);
1694 extern void ext4_truncate(struct inode *);
1695 extern int ext4_truncate_restart_trans(handle_t *, struct inode *, int nblocks);
1696 extern void ext4_set_inode_flags(struct inode *);
1697 extern void ext4_get_inode_flags(struct ext4_inode_info *);
1698 extern int ext4_alloc_da_blocks(struct inode *inode);
1699 extern void ext4_set_aops(struct inode *inode);
1700 extern int ext4_writepage_trans_blocks(struct inode *);
1701 extern int ext4_meta_trans_blocks(struct inode *, int nrblocks, int idxblocks);
1702 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks);
1703 extern int ext4_block_truncate_page(handle_t *handle,
1704 struct address_space *mapping, loff_t from);
1705 extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf);
1706 extern qsize_t *ext4_get_reserved_space(struct inode *inode);
1707 extern int flush_completed_IO(struct inode *inode);
1708 extern void ext4_da_update_reserve_space(struct inode *inode,
1709 int used, int quota_claim);
1710 /* ioctl.c */
1711 extern long ext4_ioctl(struct file *, unsigned int, unsigned long);
1712 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long);
1713
1714 /* migrate.c */
1715 extern int ext4_ext_migrate(struct inode *);
1716
1717 /* namei.c */
1718 extern int ext4_orphan_add(handle_t *, struct inode *);
1719 extern int ext4_orphan_del(handle_t *, struct inode *);
1720 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
1721 __u32 start_minor_hash, __u32 *next_hash);
1722
1723 /* resize.c */
1724 extern int ext4_group_add(struct super_block *sb,
1725 struct ext4_new_group_data *input);
1726 extern int ext4_group_extend(struct super_block *sb,
1727 struct ext4_super_block *es,
1728 ext4_fsblk_t n_blocks_count);
1729
1730 /* super.c */
1731 extern void __ext4_error(struct super_block *, const char *, unsigned int,
1732 const char *, ...)
1733 __attribute__ ((format (printf, 4, 5)));
1734 #define ext4_error(sb, message...) __ext4_error(sb, __func__, \
1735 __LINE__, ## message)
1736 extern void ext4_error_inode(struct inode *, const char *, unsigned int,
1737 ext4_fsblk_t, const char *, ...)
1738 __attribute__ ((format (printf, 5, 6)));
1739 extern void ext4_error_file(struct file *, const char *, unsigned int,
1740 const char *, ...)
1741 __attribute__ ((format (printf, 4, 5)));
1742 extern void __ext4_std_error(struct super_block *, const char *,
1743 unsigned int, int);
1744 extern void __ext4_abort(struct super_block *, const char *, unsigned int,
1745 const char *, ...)
1746 __attribute__ ((format (printf, 4, 5)));
1747 #define ext4_abort(sb, message...) __ext4_abort(sb, __func__, \
1748 __LINE__, ## message)
1749 extern void __ext4_warning(struct super_block *, const char *, unsigned int,
1750 const char *, ...)
1751 __attribute__ ((format (printf, 4, 5)));
1752 #define ext4_warning(sb, message...) __ext4_warning(sb, __func__, \
1753 __LINE__, ## message)
1754 extern void ext4_msg(struct super_block *, const char *, const char *, ...)
1755 __attribute__ ((format (printf, 3, 4)));
1756 extern void __ext4_grp_locked_error(const char *, unsigned int, \
1757 struct super_block *, ext4_group_t, \
1758 unsigned long, ext4_fsblk_t, \
1759 const char *, ...)
1760 __attribute__ ((format (printf, 7, 8)));
1761 #define ext4_grp_locked_error(sb, grp, message...) \
1762 __ext4_grp_locked_error(__func__, __LINE__, (sb), (grp), ## message)
1763 extern void ext4_update_dynamic_rev(struct super_block *sb);
1764 extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb,
1765 __u32 compat);
1766 extern int ext4_update_rocompat_feature(handle_t *handle,
1767 struct super_block *sb, __u32 rocompat);
1768 extern int ext4_update_incompat_feature(handle_t *handle,
1769 struct super_block *sb, __u32 incompat);
1770 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
1771 struct ext4_group_desc *bg);
1772 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
1773 struct ext4_group_desc *bg);
1774 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
1775 struct ext4_group_desc *bg);
1776 extern __u32 ext4_free_blks_count(struct super_block *sb,
1777 struct ext4_group_desc *bg);
1778 extern __u32 ext4_free_inodes_count(struct super_block *sb,
1779 struct ext4_group_desc *bg);
1780 extern __u32 ext4_used_dirs_count(struct super_block *sb,
1781 struct ext4_group_desc *bg);
1782 extern __u32 ext4_itable_unused_count(struct super_block *sb,
1783 struct ext4_group_desc *bg);
1784 extern void ext4_block_bitmap_set(struct super_block *sb,
1785 struct ext4_group_desc *bg, ext4_fsblk_t blk);
1786 extern void ext4_inode_bitmap_set(struct super_block *sb,
1787 struct ext4_group_desc *bg, ext4_fsblk_t blk);
1788 extern void ext4_inode_table_set(struct super_block *sb,
1789 struct ext4_group_desc *bg, ext4_fsblk_t blk);
1790 extern void ext4_free_blks_set(struct super_block *sb,
1791 struct ext4_group_desc *bg, __u32 count);
1792 extern void ext4_free_inodes_set(struct super_block *sb,
1793 struct ext4_group_desc *bg, __u32 count);
1794 extern void ext4_used_dirs_set(struct super_block *sb,
1795 struct ext4_group_desc *bg, __u32 count);
1796 extern void ext4_itable_unused_set(struct super_block *sb,
1797 struct ext4_group_desc *bg, __u32 count);
1798 extern __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 group,
1799 struct ext4_group_desc *gdp);
1800 extern int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 group,
1801 struct ext4_group_desc *gdp);
1802
1803 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
1804 {
1805 return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) |
1806 le32_to_cpu(es->s_blocks_count_lo);
1807 }
1808
1809 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
1810 {
1811 return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) |
1812 le32_to_cpu(es->s_r_blocks_count_lo);
1813 }
1814
1815 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
1816 {
1817 return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) |
1818 le32_to_cpu(es->s_free_blocks_count_lo);
1819 }
1820
1821 static inline void ext4_blocks_count_set(struct ext4_super_block *es,
1822 ext4_fsblk_t blk)
1823 {
1824 es->s_blocks_count_lo = cpu_to_le32((u32)blk);
1825 es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
1826 }
1827
1828 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
1829 ext4_fsblk_t blk)
1830 {
1831 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk);
1832 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
1833 }
1834
1835 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
1836 ext4_fsblk_t blk)
1837 {
1838 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk);
1839 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
1840 }
1841
1842 static inline loff_t ext4_isize(struct ext4_inode *raw_inode)
1843 {
1844 if (S_ISREG(le16_to_cpu(raw_inode->i_mode)))
1845 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) |
1846 le32_to_cpu(raw_inode->i_size_lo);
1847 else
1848 return (loff_t) le32_to_cpu(raw_inode->i_size_lo);
1849 }
1850
1851 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size)
1852 {
1853 raw_inode->i_size_lo = cpu_to_le32(i_size);
1854 raw_inode->i_size_high = cpu_to_le32(i_size >> 32);
1855 }
1856
1857 static inline
1858 struct ext4_group_info *ext4_get_group_info(struct super_block *sb,
1859 ext4_group_t group)
1860 {
1861 struct ext4_group_info ***grp_info;
1862 long indexv, indexh;
1863 grp_info = EXT4_SB(sb)->s_group_info;
1864 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb));
1865 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1);
1866 return grp_info[indexv][indexh];
1867 }
1868
1869 /*
1870 * Reading s_groups_count requires using smp_rmb() afterwards. See
1871 * the locking protocol documented in the comments of ext4_group_add()
1872 * in resize.c
1873 */
1874 static inline ext4_group_t ext4_get_groups_count(struct super_block *sb)
1875 {
1876 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
1877
1878 smp_rmb();
1879 return ngroups;
1880 }
1881
1882 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi,
1883 ext4_group_t block_group)
1884 {
1885 return block_group >> sbi->s_log_groups_per_flex;
1886 }
1887
1888 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi)
1889 {
1890 return 1 << sbi->s_log_groups_per_flex;
1891 }
1892
1893 #define ext4_std_error(sb, errno) \
1894 do { \
1895 if ((errno)) \
1896 __ext4_std_error((sb), __func__, __LINE__, (errno)); \
1897 } while (0)
1898
1899 #ifdef CONFIG_SMP
1900 /* Each CPU can accumulate percpu_counter_batch blocks in their local
1901 * counters. So we need to make sure we have free blocks more
1902 * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times.
1903 */
1904 #define EXT4_FREEBLOCKS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids))
1905 #else
1906 #define EXT4_FREEBLOCKS_WATERMARK 0
1907 #endif
1908
1909 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize)
1910 {
1911 /*
1912 * XXX: replace with spinlock if seen contended -bzzz
1913 */
1914 down_write(&EXT4_I(inode)->i_data_sem);
1915 if (newsize > EXT4_I(inode)->i_disksize)
1916 EXT4_I(inode)->i_disksize = newsize;
1917 up_write(&EXT4_I(inode)->i_data_sem);
1918 return ;
1919 }
1920
1921 struct ext4_group_info {
1922 unsigned long bb_state;
1923 struct rb_root bb_free_root;
1924 ext4_grpblk_t bb_first_free; /* first free block */
1925 ext4_grpblk_t bb_free; /* total free blocks */
1926 ext4_grpblk_t bb_fragments; /* nr of freespace fragments */
1927 ext4_grpblk_t bb_largest_free_order;/* order of largest frag in BG */
1928 struct list_head bb_prealloc_list;
1929 #ifdef DOUBLE_CHECK
1930 void *bb_bitmap;
1931 #endif
1932 struct rw_semaphore alloc_sem;
1933 ext4_grpblk_t bb_counters[]; /* Nr of free power-of-two-block
1934 * regions, index is order.
1935 * bb_counters[3] = 5 means
1936 * 5 free 8-block regions. */
1937 };
1938
1939 #define EXT4_GROUP_INFO_NEED_INIT_BIT 0
1940
1941 #define EXT4_MB_GRP_NEED_INIT(grp) \
1942 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state)))
1943
1944 #define EXT4_MAX_CONTENTION 8
1945 #define EXT4_CONTENTION_THRESHOLD 2
1946
1947 static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb,
1948 ext4_group_t group)
1949 {
1950 return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group);
1951 }
1952
1953 /*
1954 * Returns true if the filesystem is busy enough that attempts to
1955 * access the block group locks has run into contention.
1956 */
1957 static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi)
1958 {
1959 return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD);
1960 }
1961
1962 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group)
1963 {
1964 spinlock_t *lock = ext4_group_lock_ptr(sb, group);
1965 if (spin_trylock(lock))
1966 /*
1967 * We're able to grab the lock right away, so drop the
1968 * lock contention counter.
1969 */
1970 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0);
1971 else {
1972 /*
1973 * The lock is busy, so bump the contention counter,
1974 * and then wait on the spin lock.
1975 */
1976 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1,
1977 EXT4_MAX_CONTENTION);
1978 spin_lock(lock);
1979 }
1980 }
1981
1982 static inline void ext4_unlock_group(struct super_block *sb,
1983 ext4_group_t group)
1984 {
1985 spin_unlock(ext4_group_lock_ptr(sb, group));
1986 }
1987
1988 static inline void ext4_mark_super_dirty(struct super_block *sb)
1989 {
1990 if (EXT4_SB(sb)->s_journal == NULL)
1991 sb->s_dirt =1;
1992 }
1993
1994 /*
1995 * Inodes and files operations
1996 */
1997
1998 /* dir.c */
1999 extern const struct file_operations ext4_dir_operations;
2000
2001 /* file.c */
2002 extern const struct inode_operations ext4_file_inode_operations;
2003 extern const struct file_operations ext4_file_operations;
2004 extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin);
2005
2006 /* namei.c */
2007 extern const struct inode_operations ext4_dir_inode_operations;
2008 extern const struct inode_operations ext4_special_inode_operations;
2009 extern struct dentry *ext4_get_parent(struct dentry *child);
2010
2011 /* symlink.c */
2012 extern const struct inode_operations ext4_symlink_inode_operations;
2013 extern const struct inode_operations ext4_fast_symlink_inode_operations;
2014
2015 /* block_validity */
2016 extern void ext4_release_system_zone(struct super_block *sb);
2017 extern int ext4_setup_system_zone(struct super_block *sb);
2018 extern int __init init_ext4_system_zone(void);
2019 extern void exit_ext4_system_zone(void);
2020 extern int ext4_data_block_valid(struct ext4_sb_info *sbi,
2021 ext4_fsblk_t start_blk,
2022 unsigned int count);
2023
2024 /* extents.c */
2025 extern int ext4_ext_tree_init(handle_t *handle, struct inode *);
2026 extern int ext4_ext_writepage_trans_blocks(struct inode *, int);
2027 extern int ext4_ext_index_trans_blocks(struct inode *inode, int nrblocks,
2028 int chunk);
2029 extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
2030 struct ext4_map_blocks *map, int flags);
2031 extern void ext4_ext_truncate(struct inode *);
2032 extern void ext4_ext_init(struct super_block *);
2033 extern void ext4_ext_release(struct super_block *);
2034 extern long ext4_fallocate(struct inode *inode, int mode, loff_t offset,
2035 loff_t len);
2036 extern int ext4_convert_unwritten_extents(struct inode *inode, loff_t offset,
2037 ssize_t len);
2038 extern int ext4_map_blocks(handle_t *handle, struct inode *inode,
2039 struct ext4_map_blocks *map, int flags);
2040 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
2041 __u64 start, __u64 len);
2042 /* move_extent.c */
2043 extern int ext4_move_extents(struct file *o_filp, struct file *d_filp,
2044 __u64 start_orig, __u64 start_donor,
2045 __u64 len, __u64 *moved_len);
2046
2047
2048 /* BH_Uninit flag: blocks are allocated but uninitialized on disk */
2049 enum ext4_state_bits {
2050 BH_Uninit /* blocks are allocated but uninitialized on disk */
2051 = BH_JBDPrivateStart,
2052 };
2053
2054 BUFFER_FNS(Uninit, uninit)
2055 TAS_BUFFER_FNS(Uninit, uninit)
2056
2057 /*
2058 * Add new method to test wether block and inode bitmaps are properly
2059 * initialized. With uninit_bg reading the block from disk is not enough
2060 * to mark the bitmap uptodate. We need to also zero-out the bitmap
2061 */
2062 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart
2063
2064 static inline int bitmap_uptodate(struct buffer_head *bh)
2065 {
2066 return (buffer_uptodate(bh) &&
2067 test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state));
2068 }
2069 static inline void set_bitmap_uptodate(struct buffer_head *bh)
2070 {
2071 set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state);
2072 }
2073
2074 #define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1)
2075
2076 #endif /* __KERNEL__ */
2077
2078 #endif /* _EXT4_H */
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree