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[mirror_ubuntu-zesty-kernel.git] / fs / ext4 / ext4.h
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
33 /*
34 * The fourth extended filesystem constants/structures
35 */
36
37 /*
38 * Define EXT4FS_DEBUG to produce debug messages
39 */
40 #undef EXT4FS_DEBUG
41
42 /*
43 * Debug code
44 */
45 #ifdef EXT4FS_DEBUG
46 #define ext4_debug(f, a...) \
47 do { \
48 printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \
49 __FILE__, __LINE__, __func__); \
50 printk(KERN_DEBUG f, ## a); \
51 } while (0)
52 #else
53 #define ext4_debug(f, a...) do {} while (0)
54 #endif
55
56 /* data type for block offset of block group */
57 typedef int ext4_grpblk_t;
58
59 /* data type for filesystem-wide blocks number */
60 typedef unsigned long long ext4_fsblk_t;
61
62 /* data type for file logical block number */
63 typedef __u32 ext4_lblk_t;
64
65 /* data type for block group number */
66 typedef unsigned int ext4_group_t;
67
68
69 /* prefer goal again. length */
70 #define EXT4_MB_HINT_MERGE 1
71 /* blocks already reserved */
72 #define EXT4_MB_HINT_RESERVED 2
73 /* metadata is being allocated */
74 #define EXT4_MB_HINT_METADATA 4
75 /* first blocks in the file */
76 #define EXT4_MB_HINT_FIRST 8
77 /* search for the best chunk */
78 #define EXT4_MB_HINT_BEST 16
79 /* data is being allocated */
80 #define EXT4_MB_HINT_DATA 32
81 /* don't preallocate (for tails) */
82 #define EXT4_MB_HINT_NOPREALLOC 64
83 /* allocate for locality group */
84 #define EXT4_MB_HINT_GROUP_ALLOC 128
85 /* allocate goal blocks or none */
86 #define EXT4_MB_HINT_GOAL_ONLY 256
87 /* goal is meaningful */
88 #define EXT4_MB_HINT_TRY_GOAL 512
89 /* blocks already pre-reserved by delayed allocation */
90 #define EXT4_MB_DELALLOC_RESERVED 1024
91
92
93 struct ext4_allocation_request {
94 /* target inode for block we're allocating */
95 struct inode *inode;
96 /* logical block in target inode */
97 ext4_lblk_t logical;
98 /* phys. target (a hint) */
99 ext4_fsblk_t goal;
100 /* the closest logical allocated block to the left */
101 ext4_lblk_t lleft;
102 /* phys. block for ^^^ */
103 ext4_fsblk_t pleft;
104 /* the closest logical allocated block to the right */
105 ext4_lblk_t lright;
106 /* phys. block for ^^^ */
107 ext4_fsblk_t pright;
108 /* how many blocks we want to allocate */
109 unsigned int len;
110 /* flags. see above EXT4_MB_HINT_* */
111 unsigned int flags;
112 };
113
114 /*
115 * Special inodes numbers
116 */
117 #define EXT4_BAD_INO 1 /* Bad blocks inode */
118 #define EXT4_ROOT_INO 2 /* Root inode */
119 #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */
120 #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */
121 #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */
122 #define EXT4_JOURNAL_INO 8 /* Journal inode */
123
124 /* First non-reserved inode for old ext4 filesystems */
125 #define EXT4_GOOD_OLD_FIRST_INO 11
126
127 /*
128 * Maximal count of links to a file
129 */
130 #define EXT4_LINK_MAX 65000
131
132 /*
133 * Macro-instructions used to manage several block sizes
134 */
135 #define EXT4_MIN_BLOCK_SIZE 1024
136 #define EXT4_MAX_BLOCK_SIZE 65536
137 #define EXT4_MIN_BLOCK_LOG_SIZE 10
138 #ifdef __KERNEL__
139 # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize)
140 #else
141 # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
142 #endif
143 #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32))
144 #ifdef __KERNEL__
145 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits)
146 #else
147 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10)
148 #endif
149 #ifdef __KERNEL__
150 #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits)
151 #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size)
152 #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino)
153 #else
154 #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
155 EXT4_GOOD_OLD_INODE_SIZE : \
156 (s)->s_inode_size)
157 #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
158 EXT4_GOOD_OLD_FIRST_INO : \
159 (s)->s_first_ino)
160 #endif
161 #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits)))
162
163 /*
164 * Structure of a blocks group descriptor
165 */
166 struct ext4_group_desc
167 {
168 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */
169 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */
170 __le32 bg_inode_table_lo; /* Inodes table block */
171 __le16 bg_free_blocks_count_lo;/* Free blocks count */
172 __le16 bg_free_inodes_count_lo;/* Free inodes count */
173 __le16 bg_used_dirs_count_lo; /* Directories count */
174 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */
175 __u32 bg_reserved[2]; /* Likely block/inode bitmap checksum */
176 __le16 bg_itable_unused_lo; /* Unused inodes count */
177 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */
178 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */
179 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */
180 __le32 bg_inode_table_hi; /* Inodes table block MSB */
181 __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */
182 __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */
183 __le16 bg_used_dirs_count_hi; /* Directories count MSB */
184 __le16 bg_itable_unused_hi; /* Unused inodes count MSB */
185 __u32 bg_reserved2[3];
186 };
187
188 /*
189 * Structure of a flex block group info
190 */
191
192 struct flex_groups {
193 atomic_t free_inodes;
194 atomic_t free_blocks;
195 atomic_t used_dirs;
196 };
197
198 #define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */
199 #define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */
200 #define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */
201
202 /*
203 * Macro-instructions used to manage group descriptors
204 */
205 #define EXT4_MIN_DESC_SIZE 32
206 #define EXT4_MIN_DESC_SIZE_64BIT 64
207 #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE
208 #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size)
209 #ifdef __KERNEL__
210 # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group)
211 # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block)
212 # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group)
213 # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits)
214 #else
215 # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group)
216 # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
217 # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group)
218 #endif
219
220 /*
221 * Constants relative to the data blocks
222 */
223 #define EXT4_NDIR_BLOCKS 12
224 #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS
225 #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1)
226 #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1)
227 #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1)
228
229 /*
230 * Inode flags
231 */
232 #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */
233 #define EXT4_UNRM_FL 0x00000002 /* Undelete */
234 #define EXT4_COMPR_FL 0x00000004 /* Compress file */
235 #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */
236 #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */
237 #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */
238 #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */
239 #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */
240 /* Reserved for compression usage... */
241 #define EXT4_DIRTY_FL 0x00000100
242 #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
243 #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */
244 #define EXT4_ECOMPR_FL 0x00000800 /* Compression error */
245 /* End compression flags --- maybe not all used */
246 #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */
247 #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */
248 #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */
249 #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */
250 #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
251 #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
252 #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */
253 #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */
254 #define EXT4_EXT_MIGRATE 0x00100000 /* Inode is migrating */
255 #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */
256
257 #define EXT4_FL_USER_VISIBLE 0x000BDFFF /* User visible flags */
258 #define EXT4_FL_USER_MODIFIABLE 0x000B80FF /* User modifiable flags */
259
260 /* Flags that should be inherited by new inodes from their parent. */
261 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\
262 EXT4_SYNC_FL | EXT4_IMMUTABLE_FL | EXT4_APPEND_FL |\
263 EXT4_NODUMP_FL | EXT4_NOATIME_FL |\
264 EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\
265 EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL)
266
267 /* Flags that are appropriate for regular files (all but dir-specific ones). */
268 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL))
269
270 /* Flags that are appropriate for non-directories/regular files. */
271 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL)
272
273 /* Mask out flags that are inappropriate for the given type of inode. */
274 static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags)
275 {
276 if (S_ISDIR(mode))
277 return flags;
278 else if (S_ISREG(mode))
279 return flags & EXT4_REG_FLMASK;
280 else
281 return flags & EXT4_OTHER_FLMASK;
282 }
283
284 /*
285 * Inode dynamic state flags
286 */
287 #define EXT4_STATE_JDATA 0x00000001 /* journaled data exists */
288 #define EXT4_STATE_NEW 0x00000002 /* inode is newly created */
289 #define EXT4_STATE_XATTR 0x00000004 /* has in-inode xattrs */
290 #define EXT4_STATE_NO_EXPAND 0x00000008 /* No space for expansion */
291 #define EXT4_STATE_DA_ALLOC_CLOSE 0x00000010 /* Alloc DA blks on close */
292
293 /* Used to pass group descriptor data when online resize is done */
294 struct ext4_new_group_input {
295 __u32 group; /* Group number for this data */
296 __u64 block_bitmap; /* Absolute block number of block bitmap */
297 __u64 inode_bitmap; /* Absolute block number of inode bitmap */
298 __u64 inode_table; /* Absolute block number of inode table start */
299 __u32 blocks_count; /* Total number of blocks in this group */
300 __u16 reserved_blocks; /* Number of reserved blocks in this group */
301 __u16 unused;
302 };
303
304 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */
305 struct ext4_new_group_data {
306 __u32 group;
307 __u64 block_bitmap;
308 __u64 inode_bitmap;
309 __u64 inode_table;
310 __u32 blocks_count;
311 __u16 reserved_blocks;
312 __u16 unused;
313 __u32 free_blocks_count;
314 };
315
316 /*
317 * Flags used by ext4_get_blocks()
318 */
319 /* Allocate any needed blocks and/or convert an unitialized
320 extent to be an initialized ext4 */
321 #define EXT4_GET_BLOCKS_CREATE 0x0001
322 /* Request the creation of an unitialized extent */
323 #define EXT4_GET_BLOCKS_UNINIT_EXT 0x0002
324 #define EXT4_GET_BLOCKS_CREATE_UNINIT_EXT (EXT4_GET_BLOCKS_UNINIT_EXT|\
325 EXT4_GET_BLOCKS_CREATE)
326 /* Update the ext4_inode_info i_disksize field */
327 #define EXT4_GET_BLOCKS_EXTEND_DISKSIZE 0x0004
328 /* Caller is from the delayed allocation writeout path,
329 so set the magic i_delalloc_reserve_flag after taking the
330 inode allocation semaphore for */
331 #define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0008
332 /* Call ext4_da_update_reserve_space() after successfully
333 allocating the blocks */
334 #define EXT4_GET_BLOCKS_UPDATE_RESERVE_SPACE 0x0010
335
336
337 /*
338 * ioctl commands
339 */
340 #define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS
341 #define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS
342 #define EXT4_IOC_GETVERSION _IOR('f', 3, long)
343 #define EXT4_IOC_SETVERSION _IOW('f', 4, long)
344 #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION
345 #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION
346 #ifdef CONFIG_JBD2_DEBUG
347 #define EXT4_IOC_WAIT_FOR_READONLY _IOR('f', 99, long)
348 #endif
349 #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long)
350 #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long)
351 #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long)
352 #define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input)
353 #define EXT4_IOC_MIGRATE _IO('f', 9)
354 /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */
355 /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */
356 #define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12)
357
358 /*
359 * ioctl commands in 32 bit emulation
360 */
361 #define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS
362 #define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS
363 #define EXT4_IOC32_GETVERSION _IOR('f', 3, int)
364 #define EXT4_IOC32_SETVERSION _IOW('f', 4, int)
365 #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int)
366 #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int)
367 #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int)
368 #ifdef CONFIG_JBD2_DEBUG
369 #define EXT4_IOC32_WAIT_FOR_READONLY _IOR('f', 99, int)
370 #endif
371 #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION
372 #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION
373
374
375 /*
376 * Mount options
377 */
378 struct ext4_mount_options {
379 unsigned long s_mount_opt;
380 uid_t s_resuid;
381 gid_t s_resgid;
382 unsigned long s_commit_interval;
383 u32 s_min_batch_time, s_max_batch_time;
384 #ifdef CONFIG_QUOTA
385 int s_jquota_fmt;
386 char *s_qf_names[MAXQUOTAS];
387 #endif
388 };
389
390 /*
391 * Structure of an inode on the disk
392 */
393 struct ext4_inode {
394 __le16 i_mode; /* File mode */
395 __le16 i_uid; /* Low 16 bits of Owner Uid */
396 __le32 i_size_lo; /* Size in bytes */
397 __le32 i_atime; /* Access time */
398 __le32 i_ctime; /* Inode Change time */
399 __le32 i_mtime; /* Modification time */
400 __le32 i_dtime; /* Deletion Time */
401 __le16 i_gid; /* Low 16 bits of Group Id */
402 __le16 i_links_count; /* Links count */
403 __le32 i_blocks_lo; /* Blocks count */
404 __le32 i_flags; /* File flags */
405 union {
406 struct {
407 __le32 l_i_version;
408 } linux1;
409 struct {
410 __u32 h_i_translator;
411 } hurd1;
412 struct {
413 __u32 m_i_reserved1;
414 } masix1;
415 } osd1; /* OS dependent 1 */
416 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
417 __le32 i_generation; /* File version (for NFS) */
418 __le32 i_file_acl_lo; /* File ACL */
419 __le32 i_size_high;
420 __le32 i_obso_faddr; /* Obsoleted fragment address */
421 union {
422 struct {
423 __le16 l_i_blocks_high; /* were l_i_reserved1 */
424 __le16 l_i_file_acl_high;
425 __le16 l_i_uid_high; /* these 2 fields */
426 __le16 l_i_gid_high; /* were reserved2[0] */
427 __u32 l_i_reserved2;
428 } linux2;
429 struct {
430 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
431 __u16 h_i_mode_high;
432 __u16 h_i_uid_high;
433 __u16 h_i_gid_high;
434 __u32 h_i_author;
435 } hurd2;
436 struct {
437 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
438 __le16 m_i_file_acl_high;
439 __u32 m_i_reserved2[2];
440 } masix2;
441 } osd2; /* OS dependent 2 */
442 __le16 i_extra_isize;
443 __le16 i_pad1;
444 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */
445 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */
446 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */
447 __le32 i_crtime; /* File Creation time */
448 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */
449 __le32 i_version_hi; /* high 32 bits for 64-bit version */
450 };
451
452
453 #define EXT4_EPOCH_BITS 2
454 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
455 #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS)
456
457 /*
458 * Extended fields will fit into an inode if the filesystem was formatted
459 * with large inodes (-I 256 or larger) and there are not currently any EAs
460 * consuming all of the available space. For new inodes we always reserve
461 * enough space for the kernel's known extended fields, but for inodes
462 * created with an old kernel this might not have been the case. None of
463 * the extended inode fields is critical for correct filesystem operation.
464 * This macro checks if a certain field fits in the inode. Note that
465 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
466 */
467 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \
468 ((offsetof(typeof(*ext4_inode), field) + \
469 sizeof((ext4_inode)->field)) \
470 <= (EXT4_GOOD_OLD_INODE_SIZE + \
471 (einode)->i_extra_isize)) \
472
473 static inline __le32 ext4_encode_extra_time(struct timespec *time)
474 {
475 return cpu_to_le32((sizeof(time->tv_sec) > 4 ?
476 time->tv_sec >> 32 : 0) |
477 ((time->tv_nsec << 2) & EXT4_NSEC_MASK));
478 }
479
480 static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra)
481 {
482 if (sizeof(time->tv_sec) > 4)
483 time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK)
484 << 32;
485 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> 2;
486 }
487
488 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \
489 do { \
490 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \
491 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
492 (raw_inode)->xtime ## _extra = \
493 ext4_encode_extra_time(&(inode)->xtime); \
494 } while (0)
495
496 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \
497 do { \
498 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
499 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \
500 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
501 (raw_inode)->xtime ## _extra = \
502 ext4_encode_extra_time(&(einode)->xtime); \
503 } while (0)
504
505 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \
506 do { \
507 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \
508 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
509 ext4_decode_extra_time(&(inode)->xtime, \
510 raw_inode->xtime ## _extra); \
511 } while (0)
512
513 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \
514 do { \
515 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
516 (einode)->xtime.tv_sec = \
517 (signed)le32_to_cpu((raw_inode)->xtime); \
518 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
519 ext4_decode_extra_time(&(einode)->xtime, \
520 raw_inode->xtime ## _extra); \
521 } while (0)
522
523 #define i_disk_version osd1.linux1.l_i_version
524
525 #if defined(__KERNEL__) || defined(__linux__)
526 #define i_reserved1 osd1.linux1.l_i_reserved1
527 #define i_file_acl_high osd2.linux2.l_i_file_acl_high
528 #define i_blocks_high osd2.linux2.l_i_blocks_high
529 #define i_uid_low i_uid
530 #define i_gid_low i_gid
531 #define i_uid_high osd2.linux2.l_i_uid_high
532 #define i_gid_high osd2.linux2.l_i_gid_high
533 #define i_reserved2 osd2.linux2.l_i_reserved2
534
535 #elif defined(__GNU__)
536
537 #define i_translator osd1.hurd1.h_i_translator
538 #define i_uid_high osd2.hurd2.h_i_uid_high
539 #define i_gid_high osd2.hurd2.h_i_gid_high
540 #define i_author osd2.hurd2.h_i_author
541
542 #elif defined(__masix__)
543
544 #define i_reserved1 osd1.masix1.m_i_reserved1
545 #define i_file_acl_high osd2.masix2.m_i_file_acl_high
546 #define i_reserved2 osd2.masix2.m_i_reserved2
547
548 #endif /* defined(__KERNEL__) || defined(__linux__) */
549
550 /*
551 * storage for cached extent
552 */
553 struct ext4_ext_cache {
554 ext4_fsblk_t ec_start;
555 ext4_lblk_t ec_block;
556 __u32 ec_len; /* must be 32bit to return holes */
557 __u32 ec_type;
558 };
559
560 /*
561 * fourth extended file system inode data in memory
562 */
563 struct ext4_inode_info {
564 __le32 i_data[15]; /* unconverted */
565 __u32 i_flags;
566 ext4_fsblk_t i_file_acl;
567 __u32 i_dtime;
568
569 /*
570 * i_block_group is the number of the block group which contains
571 * this file's inode. Constant across the lifetime of the inode,
572 * it is ued for making block allocation decisions - we try to
573 * place a file's data blocks near its inode block, and new inodes
574 * near to their parent directory's inode.
575 */
576 ext4_group_t i_block_group;
577 __u32 i_state; /* Dynamic state flags for ext4 */
578
579 ext4_lblk_t i_dir_start_lookup;
580 #ifdef CONFIG_EXT4_FS_XATTR
581 /*
582 * Extended attributes can be read independently of the main file
583 * data. Taking i_mutex even when reading would cause contention
584 * between readers of EAs and writers of regular file data, so
585 * instead we synchronize on xattr_sem when reading or changing
586 * EAs.
587 */
588 struct rw_semaphore xattr_sem;
589 #endif
590 #ifdef CONFIG_EXT4_FS_POSIX_ACL
591 struct posix_acl *i_acl;
592 struct posix_acl *i_default_acl;
593 #endif
594
595 struct list_head i_orphan; /* unlinked but open inodes */
596
597 /*
598 * i_disksize keeps track of what the inode size is ON DISK, not
599 * in memory. During truncate, i_size is set to the new size by
600 * the VFS prior to calling ext4_truncate(), but the filesystem won't
601 * set i_disksize to 0 until the truncate is actually under way.
602 *
603 * The intent is that i_disksize always represents the blocks which
604 * are used by this file. This allows recovery to restart truncate
605 * on orphans if we crash during truncate. We actually write i_disksize
606 * into the on-disk inode when writing inodes out, instead of i_size.
607 *
608 * The only time when i_disksize and i_size may be different is when
609 * a truncate is in progress. The only things which change i_disksize
610 * are ext4_get_block (growth) and ext4_truncate (shrinkth).
611 */
612 loff_t i_disksize;
613
614 /*
615 * i_data_sem is for serialising ext4_truncate() against
616 * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's
617 * data tree are chopped off during truncate. We can't do that in
618 * ext4 because whenever we perform intermediate commits during
619 * truncate, the inode and all the metadata blocks *must* be in a
620 * consistent state which allows truncation of the orphans to restart
621 * during recovery. Hence we must fix the get_block-vs-truncate race
622 * by other means, so we have i_data_sem.
623 */
624 struct rw_semaphore i_data_sem;
625 struct inode vfs_inode;
626 struct jbd2_inode jinode;
627
628 struct ext4_ext_cache i_cached_extent;
629 /*
630 * File creation time. Its function is same as that of
631 * struct timespec i_{a,c,m}time in the generic inode.
632 */
633 struct timespec i_crtime;
634
635 /* mballoc */
636 struct list_head i_prealloc_list;
637 spinlock_t i_prealloc_lock;
638
639 /* ialloc */
640 ext4_group_t i_last_alloc_group;
641
642 /* allocation reservation info for delalloc */
643 unsigned int i_reserved_data_blocks;
644 unsigned int i_reserved_meta_blocks;
645 unsigned int i_allocated_meta_blocks;
646 unsigned short i_delalloc_reserved_flag;
647
648 /* on-disk additional length */
649 __u16 i_extra_isize;
650
651 spinlock_t i_block_reservation_lock;
652 };
653
654 /*
655 * File system states
656 */
657 #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */
658 #define EXT4_ERROR_FS 0x0002 /* Errors detected */
659 #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */
660
661 /*
662 * Misc. filesystem flags
663 */
664 #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */
665 #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */
666 #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */
667
668 /*
669 * Mount flags
670 */
671 #define EXT4_MOUNT_OLDALLOC 0x00002 /* Don't use the new Orlov allocator */
672 #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */
673 #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */
674 #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */
675 #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */
676 #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */
677 #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */
678 #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/
679 #define EXT4_MOUNT_ABORT 0x00200 /* Fatal error detected */
680 #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */
681 #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */
682 #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */
683 #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */
684 #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */
685 #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */
686 #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */
687 #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */
688 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */
689 #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */
690 #define EXT4_MOUNT_NOBH 0x40000 /* No bufferheads */
691 #define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */
692 #define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */
693 #define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */
694 #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */
695 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */
696 #define EXT4_MOUNT_I_VERSION 0x2000000 /* i_version support */
697 #define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */
698 #define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */
699 #define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */
700
701 /* Compatibility, for having both ext2_fs.h and ext4_fs.h included at once */
702 #ifndef _LINUX_EXT2_FS_H
703 #define clear_opt(o, opt) o &= ~EXT4_MOUNT_##opt
704 #define set_opt(o, opt) o |= EXT4_MOUNT_##opt
705 #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \
706 EXT4_MOUNT_##opt)
707 #else
708 #define EXT2_MOUNT_NOLOAD EXT4_MOUNT_NOLOAD
709 #define EXT2_MOUNT_ABORT EXT4_MOUNT_ABORT
710 #define EXT2_MOUNT_DATA_FLAGS EXT4_MOUNT_DATA_FLAGS
711 #endif
712
713 #define ext4_set_bit ext2_set_bit
714 #define ext4_set_bit_atomic ext2_set_bit_atomic
715 #define ext4_clear_bit ext2_clear_bit
716 #define ext4_clear_bit_atomic ext2_clear_bit_atomic
717 #define ext4_test_bit ext2_test_bit
718 #define ext4_find_first_zero_bit ext2_find_first_zero_bit
719 #define ext4_find_next_zero_bit ext2_find_next_zero_bit
720 #define ext4_find_next_bit ext2_find_next_bit
721
722 /*
723 * Maximal mount counts between two filesystem checks
724 */
725 #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
726 #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */
727
728 /*
729 * Behaviour when detecting errors
730 */
731 #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */
732 #define EXT4_ERRORS_RO 2 /* Remount fs read-only */
733 #define EXT4_ERRORS_PANIC 3 /* Panic */
734 #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE
735
736 /*
737 * Structure of the super block
738 */
739 struct ext4_super_block {
740 /*00*/ __le32 s_inodes_count; /* Inodes count */
741 __le32 s_blocks_count_lo; /* Blocks count */
742 __le32 s_r_blocks_count_lo; /* Reserved blocks count */
743 __le32 s_free_blocks_count_lo; /* Free blocks count */
744 /*10*/ __le32 s_free_inodes_count; /* Free inodes count */
745 __le32 s_first_data_block; /* First Data Block */
746 __le32 s_log_block_size; /* Block size */
747 __le32 s_obso_log_frag_size; /* Obsoleted fragment size */
748 /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */
749 __le32 s_obso_frags_per_group; /* Obsoleted fragments per group */
750 __le32 s_inodes_per_group; /* # Inodes per group */
751 __le32 s_mtime; /* Mount time */
752 /*30*/ __le32 s_wtime; /* Write time */
753 __le16 s_mnt_count; /* Mount count */
754 __le16 s_max_mnt_count; /* Maximal mount count */
755 __le16 s_magic; /* Magic signature */
756 __le16 s_state; /* File system state */
757 __le16 s_errors; /* Behaviour when detecting errors */
758 __le16 s_minor_rev_level; /* minor revision level */
759 /*40*/ __le32 s_lastcheck; /* time of last check */
760 __le32 s_checkinterval; /* max. time between checks */
761 __le32 s_creator_os; /* OS */
762 __le32 s_rev_level; /* Revision level */
763 /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */
764 __le16 s_def_resgid; /* Default gid for reserved blocks */
765 /*
766 * These fields are for EXT4_DYNAMIC_REV superblocks only.
767 *
768 * Note: the difference between the compatible feature set and
769 * the incompatible feature set is that if there is a bit set
770 * in the incompatible feature set that the kernel doesn't
771 * know about, it should refuse to mount the filesystem.
772 *
773 * e2fsck's requirements are more strict; if it doesn't know
774 * about a feature in either the compatible or incompatible
775 * feature set, it must abort and not try to meddle with
776 * things it doesn't understand...
777 */
778 __le32 s_first_ino; /* First non-reserved inode */
779 __le16 s_inode_size; /* size of inode structure */
780 __le16 s_block_group_nr; /* block group # of this superblock */
781 __le32 s_feature_compat; /* compatible feature set */
782 /*60*/ __le32 s_feature_incompat; /* incompatible feature set */
783 __le32 s_feature_ro_compat; /* readonly-compatible feature set */
784 /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */
785 /*78*/ char s_volume_name[16]; /* volume name */
786 /*88*/ char s_last_mounted[64]; /* directory where last mounted */
787 /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */
788 /*
789 * Performance hints. Directory preallocation should only
790 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
791 */
792 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/
793 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */
794 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */
795 /*
796 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
797 */
798 /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */
799 /*E0*/ __le32 s_journal_inum; /* inode number of journal file */
800 __le32 s_journal_dev; /* device number of journal file */
801 __le32 s_last_orphan; /* start of list of inodes to delete */
802 __le32 s_hash_seed[4]; /* HTREE hash seed */
803 __u8 s_def_hash_version; /* Default hash version to use */
804 __u8 s_reserved_char_pad;
805 __le16 s_desc_size; /* size of group descriptor */
806 /*100*/ __le32 s_default_mount_opts;
807 __le32 s_first_meta_bg; /* First metablock block group */
808 __le32 s_mkfs_time; /* When the filesystem was created */
809 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */
810 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
811 /*150*/ __le32 s_blocks_count_hi; /* Blocks count */
812 __le32 s_r_blocks_count_hi; /* Reserved blocks count */
813 __le32 s_free_blocks_count_hi; /* Free blocks count */
814 __le16 s_min_extra_isize; /* All inodes have at least # bytes */
815 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */
816 __le32 s_flags; /* Miscellaneous flags */
817 __le16 s_raid_stride; /* RAID stride */
818 __le16 s_mmp_interval; /* # seconds to wait in MMP checking */
819 __le64 s_mmp_block; /* Block for multi-mount protection */
820 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/
821 __u8 s_log_groups_per_flex; /* FLEX_BG group size */
822 __u8 s_reserved_char_pad2;
823 __le16 s_reserved_pad;
824 __le64 s_kbytes_written; /* nr of lifetime kilobytes written */
825 __u32 s_reserved[160]; /* Padding to the end of the block */
826 };
827
828 #ifdef __KERNEL__
829 /*
830 * fourth extended-fs super-block data in memory
831 */
832 struct ext4_sb_info {
833 unsigned long s_desc_size; /* Size of a group descriptor in bytes */
834 unsigned long s_inodes_per_block;/* Number of inodes per block */
835 unsigned long s_blocks_per_group;/* Number of blocks in a group */
836 unsigned long s_inodes_per_group;/* Number of inodes in a group */
837 unsigned long s_itb_per_group; /* Number of inode table blocks per group */
838 unsigned long s_gdb_count; /* Number of group descriptor blocks */
839 unsigned long s_desc_per_block; /* Number of group descriptors per block */
840 ext4_group_t s_groups_count; /* Number of groups in the fs */
841 unsigned long s_overhead_last; /* Last calculated overhead */
842 unsigned long s_blocks_last; /* Last seen block count */
843 loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */
844 struct buffer_head * s_sbh; /* Buffer containing the super block */
845 struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */
846 struct buffer_head **s_group_desc;
847 unsigned long s_mount_opt;
848 ext4_fsblk_t s_sb_block;
849 uid_t s_resuid;
850 gid_t s_resgid;
851 unsigned short s_mount_state;
852 unsigned short s_pad;
853 int s_addr_per_block_bits;
854 int s_desc_per_block_bits;
855 int s_inode_size;
856 int s_first_ino;
857 unsigned int s_inode_readahead_blks;
858 spinlock_t s_next_gen_lock;
859 u32 s_next_generation;
860 u32 s_hash_seed[4];
861 int s_def_hash_version;
862 int s_hash_unsigned; /* 3 if hash should be signed, 0 if not */
863 struct percpu_counter s_freeblocks_counter;
864 struct percpu_counter s_freeinodes_counter;
865 struct percpu_counter s_dirs_counter;
866 struct percpu_counter s_dirtyblocks_counter;
867 struct blockgroup_lock *s_blockgroup_lock;
868 struct proc_dir_entry *s_proc;
869 struct kobject s_kobj;
870 struct completion s_kobj_unregister;
871
872 /* Journaling */
873 struct inode *s_journal_inode;
874 struct journal_s *s_journal;
875 struct list_head s_orphan;
876 struct mutex s_orphan_lock;
877 struct mutex s_resize_lock;
878 unsigned long s_commit_interval;
879 u32 s_max_batch_time;
880 u32 s_min_batch_time;
881 struct block_device *journal_bdev;
882 #ifdef CONFIG_JBD2_DEBUG
883 struct timer_list turn_ro_timer; /* For turning read-only (crash simulation) */
884 wait_queue_head_t ro_wait_queue; /* For people waiting for the fs to go read-only */
885 #endif
886 #ifdef CONFIG_QUOTA
887 char *s_qf_names[MAXQUOTAS]; /* Names of quota files with journalled quota */
888 int s_jquota_fmt; /* Format of quota to use */
889 #endif
890 unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */
891 struct rb_root system_blks;
892
893 #ifdef EXTENTS_STATS
894 /* ext4 extents stats */
895 unsigned long s_ext_min;
896 unsigned long s_ext_max;
897 unsigned long s_depth_max;
898 spinlock_t s_ext_stats_lock;
899 unsigned long s_ext_blocks;
900 unsigned long s_ext_extents;
901 #endif
902
903 /* for buddy allocator */
904 struct ext4_group_info ***s_group_info;
905 struct inode *s_buddy_cache;
906 long s_blocks_reserved;
907 spinlock_t s_reserve_lock;
908 spinlock_t s_md_lock;
909 tid_t s_last_transaction;
910 unsigned short *s_mb_offsets;
911 unsigned int *s_mb_maxs;
912
913 /* tunables */
914 unsigned long s_stripe;
915 unsigned int s_mb_stream_request;
916 unsigned int s_mb_max_to_scan;
917 unsigned int s_mb_min_to_scan;
918 unsigned int s_mb_stats;
919 unsigned int s_mb_order2_reqs;
920 unsigned int s_mb_group_prealloc;
921 /* where last allocation was done - for stream allocation */
922 unsigned long s_mb_last_group;
923 unsigned long s_mb_last_start;
924
925 /* history to debug policy */
926 struct ext4_mb_history *s_mb_history;
927 int s_mb_history_cur;
928 int s_mb_history_max;
929 int s_mb_history_num;
930 spinlock_t s_mb_history_lock;
931 int s_mb_history_filter;
932
933 /* stats for buddy allocator */
934 spinlock_t s_mb_pa_lock;
935 atomic_t s_bal_reqs; /* number of reqs with len > 1 */
936 atomic_t s_bal_success; /* we found long enough chunks */
937 atomic_t s_bal_allocated; /* in blocks */
938 atomic_t s_bal_ex_scanned; /* total extents scanned */
939 atomic_t s_bal_goals; /* goal hits */
940 atomic_t s_bal_breaks; /* too long searches */
941 atomic_t s_bal_2orders; /* 2^order hits */
942 spinlock_t s_bal_lock;
943 unsigned long s_mb_buddies_generated;
944 unsigned long long s_mb_generation_time;
945 atomic_t s_mb_lost_chunks;
946 atomic_t s_mb_preallocated;
947 atomic_t s_mb_discarded;
948
949 /* locality groups */
950 struct ext4_locality_group *s_locality_groups;
951
952 /* for write statistics */
953 unsigned long s_sectors_written_start;
954 u64 s_kbytes_written;
955
956 unsigned int s_log_groups_per_flex;
957 struct flex_groups *s_flex_groups;
958 };
959
960 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb)
961 {
962 return sb->s_fs_info;
963 }
964 static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
965 {
966 return container_of(inode, struct ext4_inode_info, vfs_inode);
967 }
968
969 static inline struct timespec ext4_current_time(struct inode *inode)
970 {
971 return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ?
972 current_fs_time(inode->i_sb) : CURRENT_TIME_SEC;
973 }
974
975 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
976 {
977 return ino == EXT4_ROOT_INO ||
978 ino == EXT4_JOURNAL_INO ||
979 ino == EXT4_RESIZE_INO ||
980 (ino >= EXT4_FIRST_INO(sb) &&
981 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
982 }
983 #else
984 /* Assume that user mode programs are passing in an ext4fs superblock, not
985 * a kernel struct super_block. This will allow us to call the feature-test
986 * macros from user land. */
987 #define EXT4_SB(sb) (sb)
988 #endif
989
990 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
991
992 /*
993 * Codes for operating systems
994 */
995 #define EXT4_OS_LINUX 0
996 #define EXT4_OS_HURD 1
997 #define EXT4_OS_MASIX 2
998 #define EXT4_OS_FREEBSD 3
999 #define EXT4_OS_LITES 4
1000
1001 /*
1002 * Revision levels
1003 */
1004 #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */
1005 #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
1006
1007 #define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV
1008 #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV
1009
1010 #define EXT4_GOOD_OLD_INODE_SIZE 128
1011
1012 /*
1013 * Feature set definitions
1014 */
1015
1016 #define EXT4_HAS_COMPAT_FEATURE(sb,mask) \
1017 ((EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask)) != 0)
1018 #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \
1019 ((EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask)) != 0)
1020 #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \
1021 ((EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask)) != 0)
1022 #define EXT4_SET_COMPAT_FEATURE(sb,mask) \
1023 EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
1024 #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \
1025 EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
1026 #define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \
1027 EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
1028 #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \
1029 EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
1030 #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \
1031 EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
1032 #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \
1033 EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
1034
1035 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001
1036 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002
1037 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004
1038 #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008
1039 #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010
1040 #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020
1041
1042 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
1043 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
1044 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
1045 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008
1046 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010
1047 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020
1048 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040
1049
1050 #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001
1051 #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002
1052 #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */
1053 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */
1054 #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010
1055 #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */
1056 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080
1057 #define EXT4_FEATURE_INCOMPAT_MMP 0x0100
1058 #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200
1059
1060 #define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR
1061 #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1062 EXT4_FEATURE_INCOMPAT_RECOVER| \
1063 EXT4_FEATURE_INCOMPAT_META_BG| \
1064 EXT4_FEATURE_INCOMPAT_EXTENTS| \
1065 EXT4_FEATURE_INCOMPAT_64BIT| \
1066 EXT4_FEATURE_INCOMPAT_FLEX_BG)
1067 #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1068 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1069 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
1070 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
1071 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
1072 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
1073 EXT4_FEATURE_RO_COMPAT_HUGE_FILE)
1074
1075 /*
1076 * Default values for user and/or group using reserved blocks
1077 */
1078 #define EXT4_DEF_RESUID 0
1079 #define EXT4_DEF_RESGID 0
1080
1081 #define EXT4_DEF_INODE_READAHEAD_BLKS 32
1082
1083 /*
1084 * Default mount options
1085 */
1086 #define EXT4_DEFM_DEBUG 0x0001
1087 #define EXT4_DEFM_BSDGROUPS 0x0002
1088 #define EXT4_DEFM_XATTR_USER 0x0004
1089 #define EXT4_DEFM_ACL 0x0008
1090 #define EXT4_DEFM_UID16 0x0010
1091 #define EXT4_DEFM_JMODE 0x0060
1092 #define EXT4_DEFM_JMODE_DATA 0x0020
1093 #define EXT4_DEFM_JMODE_ORDERED 0x0040
1094 #define EXT4_DEFM_JMODE_WBACK 0x0060
1095
1096 /*
1097 * Default journal batch times
1098 */
1099 #define EXT4_DEF_MIN_BATCH_TIME 0
1100 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */
1101
1102 /*
1103 * Minimum number of groups in a flexgroup before we separate out
1104 * directories into the first block group of a flexgroup
1105 */
1106 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4
1107
1108 /*
1109 * Structure of a directory entry
1110 */
1111 #define EXT4_NAME_LEN 255
1112
1113 struct ext4_dir_entry {
1114 __le32 inode; /* Inode number */
1115 __le16 rec_len; /* Directory entry length */
1116 __le16 name_len; /* Name length */
1117 char name[EXT4_NAME_LEN]; /* File name */
1118 };
1119
1120 /*
1121 * The new version of the directory entry. Since EXT4 structures are
1122 * stored in intel byte order, and the name_len field could never be
1123 * bigger than 255 chars, it's safe to reclaim the extra byte for the
1124 * file_type field.
1125 */
1126 struct ext4_dir_entry_2 {
1127 __le32 inode; /* Inode number */
1128 __le16 rec_len; /* Directory entry length */
1129 __u8 name_len; /* Name length */
1130 __u8 file_type;
1131 char name[EXT4_NAME_LEN]; /* File name */
1132 };
1133
1134 /*
1135 * Ext4 directory file types. Only the low 3 bits are used. The
1136 * other bits are reserved for now.
1137 */
1138 #define EXT4_FT_UNKNOWN 0
1139 #define EXT4_FT_REG_FILE 1
1140 #define EXT4_FT_DIR 2
1141 #define EXT4_FT_CHRDEV 3
1142 #define EXT4_FT_BLKDEV 4
1143 #define EXT4_FT_FIFO 5
1144 #define EXT4_FT_SOCK 6
1145 #define EXT4_FT_SYMLINK 7
1146
1147 #define EXT4_FT_MAX 8
1148
1149 /*
1150 * EXT4_DIR_PAD defines the directory entries boundaries
1151 *
1152 * NOTE: It must be a multiple of 4
1153 */
1154 #define EXT4_DIR_PAD 4
1155 #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1)
1156 #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \
1157 ~EXT4_DIR_ROUND)
1158 #define EXT4_MAX_REC_LEN ((1<<16)-1)
1159
1160 /*
1161 * Hash Tree Directory indexing
1162 * (c) Daniel Phillips, 2001
1163 */
1164
1165 #define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \
1166 EXT4_FEATURE_COMPAT_DIR_INDEX) && \
1167 (EXT4_I(dir)->i_flags & EXT4_INDEX_FL))
1168 #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX)
1169 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
1170
1171 /* Legal values for the dx_root hash_version field: */
1172
1173 #define DX_HASH_LEGACY 0
1174 #define DX_HASH_HALF_MD4 1
1175 #define DX_HASH_TEA 2
1176 #define DX_HASH_LEGACY_UNSIGNED 3
1177 #define DX_HASH_HALF_MD4_UNSIGNED 4
1178 #define DX_HASH_TEA_UNSIGNED 5
1179
1180 #ifdef __KERNEL__
1181
1182 /* hash info structure used by the directory hash */
1183 struct dx_hash_info
1184 {
1185 u32 hash;
1186 u32 minor_hash;
1187 int hash_version;
1188 u32 *seed;
1189 };
1190
1191 #define EXT4_HTREE_EOF 0x7fffffff
1192
1193 /*
1194 * Control parameters used by ext4_htree_next_block
1195 */
1196 #define HASH_NB_ALWAYS 1
1197
1198
1199 /*
1200 * Describe an inode's exact location on disk and in memory
1201 */
1202 struct ext4_iloc
1203 {
1204 struct buffer_head *bh;
1205 unsigned long offset;
1206 ext4_group_t block_group;
1207 };
1208
1209 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
1210 {
1211 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
1212 }
1213
1214 /*
1215 * This structure is stuffed into the struct file's private_data field
1216 * for directories. It is where we put information so that we can do
1217 * readdir operations in hash tree order.
1218 */
1219 struct dir_private_info {
1220 struct rb_root root;
1221 struct rb_node *curr_node;
1222 struct fname *extra_fname;
1223 loff_t last_pos;
1224 __u32 curr_hash;
1225 __u32 curr_minor_hash;
1226 __u32 next_hash;
1227 };
1228
1229 /* calculate the first block number of the group */
1230 static inline ext4_fsblk_t
1231 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no)
1232 {
1233 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
1234 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
1235 }
1236
1237 /*
1238 * Special error return code only used by dx_probe() and its callers.
1239 */
1240 #define ERR_BAD_DX_DIR -75000
1241
1242 void ext4_get_group_no_and_offset(struct super_block *sb, ext4_fsblk_t blocknr,
1243 ext4_group_t *blockgrpp, ext4_grpblk_t *offsetp);
1244
1245 extern struct proc_dir_entry *ext4_proc_root;
1246
1247 /*
1248 * Function prototypes
1249 */
1250
1251 /*
1252 * Ok, these declarations are also in <linux/kernel.h> but none of the
1253 * ext4 source programs needs to include it so they are duplicated here.
1254 */
1255 # define NORET_TYPE /**/
1256 # define ATTRIB_NORET __attribute__((noreturn))
1257 # define NORET_AND noreturn,
1258
1259 /* bitmap.c */
1260 extern unsigned int ext4_count_free(struct buffer_head *, unsigned);
1261
1262 /* balloc.c */
1263 extern unsigned int ext4_block_group(struct super_block *sb,
1264 ext4_fsblk_t blocknr);
1265 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb,
1266 ext4_fsblk_t blocknr);
1267 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group);
1268 extern unsigned long ext4_bg_num_gdb(struct super_block *sb,
1269 ext4_group_t group);
1270 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,
1271 ext4_fsblk_t goal, unsigned long *count, int *errp);
1272 extern int ext4_claim_free_blocks(struct ext4_sb_info *sbi, s64 nblocks);
1273 extern int ext4_has_free_blocks(struct ext4_sb_info *sbi, s64 nblocks);
1274 extern void ext4_free_blocks(handle_t *handle, struct inode *inode,
1275 ext4_fsblk_t block, unsigned long count, int metadata);
1276 extern void ext4_add_groupblocks(handle_t *handle, struct super_block *sb,
1277 ext4_fsblk_t block, unsigned long count);
1278 extern ext4_fsblk_t ext4_count_free_blocks(struct super_block *);
1279 extern void ext4_check_blocks_bitmap(struct super_block *);
1280 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
1281 ext4_group_t block_group,
1282 struct buffer_head ** bh);
1283 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
1284 struct buffer_head *ext4_read_block_bitmap(struct super_block *sb,
1285 ext4_group_t block_group);
1286 extern unsigned ext4_init_block_bitmap(struct super_block *sb,
1287 struct buffer_head *bh,
1288 ext4_group_t group,
1289 struct ext4_group_desc *desc);
1290 #define ext4_free_blocks_after_init(sb, group, desc) \
1291 ext4_init_block_bitmap(sb, NULL, group, desc)
1292
1293 /* dir.c */
1294 extern int ext4_check_dir_entry(const char *, struct inode *,
1295 struct ext4_dir_entry_2 *,
1296 struct buffer_head *, unsigned int);
1297 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
1298 __u32 minor_hash,
1299 struct ext4_dir_entry_2 *dirent);
1300 extern void ext4_htree_free_dir_info(struct dir_private_info *p);
1301
1302 /* fsync.c */
1303 extern int ext4_sync_file(struct file *, struct dentry *, int);
1304
1305 /* hash.c */
1306 extern int ext4fs_dirhash(const char *name, int len, struct
1307 dx_hash_info *hinfo);
1308
1309 /* ialloc.c */
1310 extern struct inode * ext4_new_inode(handle_t *, struct inode *, int);
1311 extern void ext4_free_inode(handle_t *, struct inode *);
1312 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long);
1313 extern unsigned long ext4_count_free_inodes(struct super_block *);
1314 extern unsigned long ext4_count_dirs(struct super_block *);
1315 extern void ext4_check_inodes_bitmap(struct super_block *);
1316 extern unsigned ext4_init_inode_bitmap(struct super_block *sb,
1317 struct buffer_head *bh,
1318 ext4_group_t group,
1319 struct ext4_group_desc *desc);
1320 extern void mark_bitmap_end(int start_bit, int end_bit, char *bitmap);
1321
1322 /* mballoc.c */
1323 extern long ext4_mb_stats;
1324 extern long ext4_mb_max_to_scan;
1325 extern int ext4_mb_init(struct super_block *, int);
1326 extern int ext4_mb_release(struct super_block *);
1327 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *,
1328 struct ext4_allocation_request *, int *);
1329 extern int ext4_mb_reserve_blocks(struct super_block *, int);
1330 extern void ext4_discard_preallocations(struct inode *);
1331 extern int __init init_ext4_mballoc(void);
1332 extern void exit_ext4_mballoc(void);
1333 extern void ext4_mb_free_blocks(handle_t *, struct inode *,
1334 unsigned long, unsigned long, int, unsigned long *);
1335 extern int ext4_mb_add_groupinfo(struct super_block *sb,
1336 ext4_group_t i, struct ext4_group_desc *desc);
1337 extern void ext4_mb_update_group_info(struct ext4_group_info *grp,
1338 ext4_grpblk_t add);
1339 extern int ext4_mb_get_buddy_cache_lock(struct super_block *, ext4_group_t);
1340 extern void ext4_mb_put_buddy_cache_lock(struct super_block *,
1341 ext4_group_t, int);
1342 /* inode.c */
1343 int ext4_forget(handle_t *handle, int is_metadata, struct inode *inode,
1344 struct buffer_head *bh, ext4_fsblk_t blocknr);
1345 struct buffer_head *ext4_getblk(handle_t *, struct inode *,
1346 ext4_lblk_t, int, int *);
1347 struct buffer_head *ext4_bread(handle_t *, struct inode *,
1348 ext4_lblk_t, int, int *);
1349 int ext4_get_block(struct inode *inode, sector_t iblock,
1350 struct buffer_head *bh_result, int create);
1351
1352 extern struct inode *ext4_iget(struct super_block *, unsigned long);
1353 extern int ext4_write_inode(struct inode *, int);
1354 extern int ext4_setattr(struct dentry *, struct iattr *);
1355 extern int ext4_getattr(struct vfsmount *mnt, struct dentry *dentry,
1356 struct kstat *stat);
1357 extern void ext4_delete_inode(struct inode *);
1358 extern int ext4_sync_inode(handle_t *, struct inode *);
1359 extern void ext4_dirty_inode(struct inode *);
1360 extern int ext4_change_inode_journal_flag(struct inode *, int);
1361 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
1362 extern int ext4_can_truncate(struct inode *inode);
1363 extern void ext4_truncate(struct inode *);
1364 extern void ext4_set_inode_flags(struct inode *);
1365 extern void ext4_get_inode_flags(struct ext4_inode_info *);
1366 extern int ext4_alloc_da_blocks(struct inode *inode);
1367 extern void ext4_set_aops(struct inode *inode);
1368 extern int ext4_writepage_trans_blocks(struct inode *);
1369 extern int ext4_meta_trans_blocks(struct inode *, int nrblocks, int idxblocks);
1370 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks);
1371 extern int ext4_block_truncate_page(handle_t *handle,
1372 struct address_space *mapping, loff_t from);
1373 extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf);
1374 extern qsize_t ext4_get_reserved_space(struct inode *inode);
1375
1376 /* ioctl.c */
1377 extern long ext4_ioctl(struct file *, unsigned int, unsigned long);
1378 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long);
1379
1380 /* migrate.c */
1381 extern int ext4_ext_migrate(struct inode *);
1382
1383 /* namei.c */
1384 extern unsigned int ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize);
1385 extern __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize);
1386 extern int ext4_orphan_add(handle_t *, struct inode *);
1387 extern int ext4_orphan_del(handle_t *, struct inode *);
1388 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
1389 __u32 start_minor_hash, __u32 *next_hash);
1390
1391 /* resize.c */
1392 extern int ext4_group_add(struct super_block *sb,
1393 struct ext4_new_group_data *input);
1394 extern int ext4_group_extend(struct super_block *sb,
1395 struct ext4_super_block *es,
1396 ext4_fsblk_t n_blocks_count);
1397
1398 /* super.c */
1399 extern void ext4_error(struct super_block *, const char *, const char *, ...)
1400 __attribute__ ((format (printf, 3, 4)));
1401 extern void __ext4_std_error(struct super_block *, const char *, int);
1402 extern void ext4_abort(struct super_block *, const char *, const char *, ...)
1403 __attribute__ ((format (printf, 3, 4)));
1404 extern void ext4_warning(struct super_block *, const char *, const char *, ...)
1405 __attribute__ ((format (printf, 3, 4)));
1406 extern void ext4_grp_locked_error(struct super_block *, ext4_group_t,
1407 const char *, const char *, ...)
1408 __attribute__ ((format (printf, 4, 5)));
1409 extern void ext4_update_dynamic_rev(struct super_block *sb);
1410 extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb,
1411 __u32 compat);
1412 extern int ext4_update_rocompat_feature(handle_t *handle,
1413 struct super_block *sb, __u32 rocompat);
1414 extern int ext4_update_incompat_feature(handle_t *handle,
1415 struct super_block *sb, __u32 incompat);
1416 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
1417 struct ext4_group_desc *bg);
1418 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
1419 struct ext4_group_desc *bg);
1420 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
1421 struct ext4_group_desc *bg);
1422 extern __u32 ext4_free_blks_count(struct super_block *sb,
1423 struct ext4_group_desc *bg);
1424 extern __u32 ext4_free_inodes_count(struct super_block *sb,
1425 struct ext4_group_desc *bg);
1426 extern __u32 ext4_used_dirs_count(struct super_block *sb,
1427 struct ext4_group_desc *bg);
1428 extern __u32 ext4_itable_unused_count(struct super_block *sb,
1429 struct ext4_group_desc *bg);
1430 extern void ext4_block_bitmap_set(struct super_block *sb,
1431 struct ext4_group_desc *bg, ext4_fsblk_t blk);
1432 extern void ext4_inode_bitmap_set(struct super_block *sb,
1433 struct ext4_group_desc *bg, ext4_fsblk_t blk);
1434 extern void ext4_inode_table_set(struct super_block *sb,
1435 struct ext4_group_desc *bg, ext4_fsblk_t blk);
1436 extern void ext4_free_blks_set(struct super_block *sb,
1437 struct ext4_group_desc *bg, __u32 count);
1438 extern void ext4_free_inodes_set(struct super_block *sb,
1439 struct ext4_group_desc *bg, __u32 count);
1440 extern void ext4_used_dirs_set(struct super_block *sb,
1441 struct ext4_group_desc *bg, __u32 count);
1442 extern void ext4_itable_unused_set(struct super_block *sb,
1443 struct ext4_group_desc *bg, __u32 count);
1444 extern __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 group,
1445 struct ext4_group_desc *gdp);
1446 extern int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 group,
1447 struct ext4_group_desc *gdp);
1448
1449 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
1450 {
1451 return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) |
1452 le32_to_cpu(es->s_blocks_count_lo);
1453 }
1454
1455 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
1456 {
1457 return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) |
1458 le32_to_cpu(es->s_r_blocks_count_lo);
1459 }
1460
1461 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
1462 {
1463 return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) |
1464 le32_to_cpu(es->s_free_blocks_count_lo);
1465 }
1466
1467 static inline void ext4_blocks_count_set(struct ext4_super_block *es,
1468 ext4_fsblk_t blk)
1469 {
1470 es->s_blocks_count_lo = cpu_to_le32((u32)blk);
1471 es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
1472 }
1473
1474 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
1475 ext4_fsblk_t blk)
1476 {
1477 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk);
1478 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
1479 }
1480
1481 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
1482 ext4_fsblk_t blk)
1483 {
1484 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk);
1485 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
1486 }
1487
1488 static inline loff_t ext4_isize(struct ext4_inode *raw_inode)
1489 {
1490 if (S_ISREG(le16_to_cpu(raw_inode->i_mode)))
1491 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) |
1492 le32_to_cpu(raw_inode->i_size_lo);
1493 else
1494 return (loff_t) le32_to_cpu(raw_inode->i_size_lo);
1495 }
1496
1497 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size)
1498 {
1499 raw_inode->i_size_lo = cpu_to_le32(i_size);
1500 raw_inode->i_size_high = cpu_to_le32(i_size >> 32);
1501 }
1502
1503 static inline
1504 struct ext4_group_info *ext4_get_group_info(struct super_block *sb,
1505 ext4_group_t group)
1506 {
1507 struct ext4_group_info ***grp_info;
1508 long indexv, indexh;
1509 grp_info = EXT4_SB(sb)->s_group_info;
1510 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb));
1511 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1);
1512 return grp_info[indexv][indexh];
1513 }
1514
1515 /*
1516 * Reading s_groups_count requires using smp_rmb() afterwards. See
1517 * the locking protocol documented in the comments of ext4_group_add()
1518 * in resize.c
1519 */
1520 static inline ext4_group_t ext4_get_groups_count(struct super_block *sb)
1521 {
1522 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
1523
1524 smp_rmb();
1525 return ngroups;
1526 }
1527
1528 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi,
1529 ext4_group_t block_group)
1530 {
1531 return block_group >> sbi->s_log_groups_per_flex;
1532 }
1533
1534 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi)
1535 {
1536 return 1 << sbi->s_log_groups_per_flex;
1537 }
1538
1539 #define ext4_std_error(sb, errno) \
1540 do { \
1541 if ((errno)) \
1542 __ext4_std_error((sb), __func__, (errno)); \
1543 } while (0)
1544
1545 #ifdef CONFIG_SMP
1546 /* Each CPU can accumulate percpu_counter_batch blocks in their local
1547 * counters. So we need to make sure we have free blocks more
1548 * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times.
1549 */
1550 #define EXT4_FREEBLOCKS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids))
1551 #else
1552 #define EXT4_FREEBLOCKS_WATERMARK 0
1553 #endif
1554
1555 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize)
1556 {
1557 /*
1558 * XXX: replace with spinlock if seen contended -bzzz
1559 */
1560 down_write(&EXT4_I(inode)->i_data_sem);
1561 if (newsize > EXT4_I(inode)->i_disksize)
1562 EXT4_I(inode)->i_disksize = newsize;
1563 up_write(&EXT4_I(inode)->i_data_sem);
1564 return ;
1565 }
1566
1567 struct ext4_group_info {
1568 unsigned long bb_state;
1569 struct rb_root bb_free_root;
1570 unsigned short bb_first_free;
1571 unsigned short bb_free;
1572 unsigned short bb_fragments;
1573 struct list_head bb_prealloc_list;
1574 #ifdef DOUBLE_CHECK
1575 void *bb_bitmap;
1576 #endif
1577 struct rw_semaphore alloc_sem;
1578 unsigned short bb_counters[];
1579 };
1580
1581 #define EXT4_GROUP_INFO_NEED_INIT_BIT 0
1582
1583 #define EXT4_MB_GRP_NEED_INIT(grp) \
1584 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state)))
1585
1586 static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb,
1587 ext4_group_t group)
1588 {
1589 return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group);
1590 }
1591
1592 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group)
1593 {
1594 spin_lock(ext4_group_lock_ptr(sb, group));
1595 }
1596
1597 static inline void ext4_unlock_group(struct super_block *sb,
1598 ext4_group_t group)
1599 {
1600 spin_unlock(ext4_group_lock_ptr(sb, group));
1601 }
1602
1603 /*
1604 * Inodes and files operations
1605 */
1606
1607 /* dir.c */
1608 extern const struct file_operations ext4_dir_operations;
1609
1610 /* file.c */
1611 extern const struct inode_operations ext4_file_inode_operations;
1612 extern const struct file_operations ext4_file_operations;
1613
1614 /* namei.c */
1615 extern const struct inode_operations ext4_dir_inode_operations;
1616 extern const struct inode_operations ext4_special_inode_operations;
1617 extern struct dentry *ext4_get_parent(struct dentry *child);
1618
1619 /* symlink.c */
1620 extern const struct inode_operations ext4_symlink_inode_operations;
1621 extern const struct inode_operations ext4_fast_symlink_inode_operations;
1622
1623 /* block_validity */
1624 extern void ext4_release_system_zone(struct super_block *sb);
1625 extern int ext4_setup_system_zone(struct super_block *sb);
1626 extern int __init init_ext4_system_zone(void);
1627 extern void exit_ext4_system_zone(void);
1628 extern int ext4_data_block_valid(struct ext4_sb_info *sbi,
1629 ext4_fsblk_t start_blk,
1630 unsigned int count);
1631
1632 /* extents.c */
1633 extern int ext4_ext_tree_init(handle_t *handle, struct inode *);
1634 extern int ext4_ext_writepage_trans_blocks(struct inode *, int);
1635 extern int ext4_ext_index_trans_blocks(struct inode *inode, int nrblocks,
1636 int chunk);
1637 extern int ext4_ext_get_blocks(handle_t *handle, struct inode *inode,
1638 ext4_lblk_t iblock, unsigned int max_blocks,
1639 struct buffer_head *bh_result, int flags);
1640 extern void ext4_ext_truncate(struct inode *);
1641 extern void ext4_ext_init(struct super_block *);
1642 extern void ext4_ext_release(struct super_block *);
1643 extern long ext4_fallocate(struct inode *inode, int mode, loff_t offset,
1644 loff_t len);
1645 extern int ext4_get_blocks(handle_t *handle, struct inode *inode,
1646 sector_t block, unsigned int max_blocks,
1647 struct buffer_head *bh, int flags);
1648 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
1649 __u64 start, __u64 len);
1650
1651 /*
1652 * Add new method to test wether block and inode bitmaps are properly
1653 * initialized. With uninit_bg reading the block from disk is not enough
1654 * to mark the bitmap uptodate. We need to also zero-out the bitmap
1655 */
1656 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart
1657
1658 static inline int bitmap_uptodate(struct buffer_head *bh)
1659 {
1660 return (buffer_uptodate(bh) &&
1661 test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state));
1662 }
1663 static inline void set_bitmap_uptodate(struct buffer_head *bh)
1664 {
1665 set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state);
1666 }
1667
1668 #endif /* __KERNEL__ */
1669
1670 #endif /* _EXT4_H */
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