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ext4: Automatically allocate delay allocated blocks on close
[linux-2.6/mini2440.git] / fs / ext4 / ext4.h
blob1b0c17364631ae465875061eb2a8046d00e55c17
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 "ext4_i.h"
25
26 /*
27 * The fourth extended filesystem constants/structures
28 */
29
30 /*
31 * Define EXT4FS_DEBUG to produce debug messages
32 */
33 #undef EXT4FS_DEBUG
34
35 /*
36 * Debug code
37 */
38 #ifdef EXT4FS_DEBUG
39 #define ext4_debug(f, a...) \
40 do { \
41 printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \
42 __FILE__, __LINE__, __func__); \
43 printk(KERN_DEBUG f, ## a); \
44 } while (0)
45 #else
46 #define ext4_debug(f, a...) do {} while (0)
47 #endif
48
49 /* prefer goal again. length */
50 #define EXT4_MB_HINT_MERGE 1
51 /* blocks already reserved */
52 #define EXT4_MB_HINT_RESERVED 2
53 /* metadata is being allocated */
54 #define EXT4_MB_HINT_METADATA 4
55 /* first blocks in the file */
56 #define EXT4_MB_HINT_FIRST 8
57 /* search for the best chunk */
58 #define EXT4_MB_HINT_BEST 16
59 /* data is being allocated */
60 #define EXT4_MB_HINT_DATA 32
61 /* don't preallocate (for tails) */
62 #define EXT4_MB_HINT_NOPREALLOC 64
63 /* allocate for locality group */
64 #define EXT4_MB_HINT_GROUP_ALLOC 128
65 /* allocate goal blocks or none */
66 #define EXT4_MB_HINT_GOAL_ONLY 256
67 /* goal is meaningful */
68 #define EXT4_MB_HINT_TRY_GOAL 512
69 /* blocks already pre-reserved by delayed allocation */
70 #define EXT4_MB_DELALLOC_RESERVED 1024
71
72
73 struct ext4_allocation_request {
74 /* target inode for block we're allocating */
75 struct inode *inode;
76 /* logical block in target inode */
77 ext4_lblk_t logical;
78 /* phys. target (a hint) */
79 ext4_fsblk_t goal;
80 /* the closest logical allocated block to the left */
81 ext4_lblk_t lleft;
82 /* phys. block for ^^^ */
83 ext4_fsblk_t pleft;
84 /* the closest logical allocated block to the right */
85 ext4_lblk_t lright;
86 /* phys. block for ^^^ */
87 ext4_fsblk_t pright;
88 /* how many blocks we want to allocate */
89 unsigned int len;
90 /* flags. see above EXT4_MB_HINT_* */
91 unsigned int flags;
92 };
93
94 /*
95 * Special inodes numbers
96 */
97 #define EXT4_BAD_INO 1 /* Bad blocks inode */
98 #define EXT4_ROOT_INO 2 /* Root inode */
99 #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */
100 #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */
101 #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */
102 #define EXT4_JOURNAL_INO 8 /* Journal inode */
103
104 /* First non-reserved inode for old ext4 filesystems */
105 #define EXT4_GOOD_OLD_FIRST_INO 11
106
107 /*
108 * Maximal count of links to a file
109 */
110 #define EXT4_LINK_MAX 65000
111
112 /*
113 * Macro-instructions used to manage several block sizes
114 */
115 #define EXT4_MIN_BLOCK_SIZE 1024
116 #define EXT4_MAX_BLOCK_SIZE 65536
117 #define EXT4_MIN_BLOCK_LOG_SIZE 10
118 #ifdef __KERNEL__
119 # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize)
120 #else
121 # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
122 #endif
123 #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32))
124 #ifdef __KERNEL__
125 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits)
126 #else
127 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10)
128 #endif
129 #ifdef __KERNEL__
130 #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits)
131 #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size)
132 #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino)
133 #else
134 #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
135 EXT4_GOOD_OLD_INODE_SIZE : \
136 (s)->s_inode_size)
137 #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
138 EXT4_GOOD_OLD_FIRST_INO : \
139 (s)->s_first_ino)
140 #endif
141 #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits)))
142
143 /*
144 * Structure of a blocks group descriptor
145 */
146 struct ext4_group_desc
147 {
148 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */
149 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */
150 __le32 bg_inode_table_lo; /* Inodes table block */
151 __le16 bg_free_blocks_count_lo;/* Free blocks count */
152 __le16 bg_free_inodes_count_lo;/* Free inodes count */
153 __le16 bg_used_dirs_count_lo; /* Directories count */
154 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */
155 __u32 bg_reserved[2]; /* Likely block/inode bitmap checksum */
156 __le16 bg_itable_unused_lo; /* Unused inodes count */
157 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */
158 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */
159 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */
160 __le32 bg_inode_table_hi; /* Inodes table block MSB */
161 __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */
162 __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */
163 __le16 bg_used_dirs_count_hi; /* Directories count MSB */
164 __le16 bg_itable_unused_hi; /* Unused inodes count MSB */
165 __u32 bg_reserved2[3];
166 };
167
168 /*
169 * Structure of a flex block group info
170 */
171
172 struct flex_groups {
173 __u32 free_inodes;
174 __u32 free_blocks;
175 };
176
177 #define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */
178 #define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */
179 #define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */
180
181 #ifdef __KERNEL__
182 #include "ext4_sb.h"
183 #endif
184 /*
185 * Macro-instructions used to manage group descriptors
186 */
187 #define EXT4_MIN_DESC_SIZE 32
188 #define EXT4_MIN_DESC_SIZE_64BIT 64
189 #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE
190 #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size)
191 #ifdef __KERNEL__
192 # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group)
193 # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block)
194 # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group)
195 # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits)
196 #else
197 # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group)
198 # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
199 # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group)
200 #endif
201
202 /*
203 * Constants relative to the data blocks
204 */
205 #define EXT4_NDIR_BLOCKS 12
206 #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS
207 #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1)
208 #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1)
209 #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1)
210
211 /*
212 * Inode flags
213 */
214 #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */
215 #define EXT4_UNRM_FL 0x00000002 /* Undelete */
216 #define EXT4_COMPR_FL 0x00000004 /* Compress file */
217 #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */
218 #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */
219 #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */
220 #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */
221 #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */
222 /* Reserved for compression usage... */
223 #define EXT4_DIRTY_FL 0x00000100
224 #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
225 #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */
226 #define EXT4_ECOMPR_FL 0x00000800 /* Compression error */
227 /* End compression flags --- maybe not all used */
228 #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */
229 #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */
230 #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */
231 #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */
232 #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
233 #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
234 #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */
235 #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */
236 #define EXT4_EXT_MIGRATE 0x00100000 /* Inode is migrating */
237 #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */
238
239 #define EXT4_FL_USER_VISIBLE 0x000BDFFF /* User visible flags */
240 #define EXT4_FL_USER_MODIFIABLE 0x000B80FF /* User modifiable flags */
241
242 /* Flags that should be inherited by new inodes from their parent. */
243 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\
244 EXT4_SYNC_FL | EXT4_IMMUTABLE_FL | EXT4_APPEND_FL |\
245 EXT4_NODUMP_FL | EXT4_NOATIME_FL |\
246 EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\
247 EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL)
248
249 /* Flags that are appropriate for regular files (all but dir-specific ones). */
250 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL))
251
252 /* Flags that are appropriate for non-directories/regular files. */
253 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL)
254
255 /* Mask out flags that are inappropriate for the given type of inode. */
256 static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags)
257 {
258 if (S_ISDIR(mode))
259 return flags;
260 else if (S_ISREG(mode))
261 return flags & EXT4_REG_FLMASK;
262 else
263 return flags & EXT4_OTHER_FLMASK;
264 }
265
266 /*
267 * Inode dynamic state flags
268 */
269 #define EXT4_STATE_JDATA 0x00000001 /* journaled data exists */
270 #define EXT4_STATE_NEW 0x00000002 /* inode is newly created */
271 #define EXT4_STATE_XATTR 0x00000004 /* has in-inode xattrs */
272 #define EXT4_STATE_NO_EXPAND 0x00000008 /* No space for expansion */
273 #define EXT4_STATE_DA_ALLOC_CLOSE 0x00000010 /* Alloc DA blks on close */
274
275 /* Used to pass group descriptor data when online resize is done */
276 struct ext4_new_group_input {
277 __u32 group; /* Group number for this data */
278 __u64 block_bitmap; /* Absolute block number of block bitmap */
279 __u64 inode_bitmap; /* Absolute block number of inode bitmap */
280 __u64 inode_table; /* Absolute block number of inode table start */
281 __u32 blocks_count; /* Total number of blocks in this group */
282 __u16 reserved_blocks; /* Number of reserved blocks in this group */
283 __u16 unused;
284 };
285
286 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */
287 struct ext4_new_group_data {
288 __u32 group;
289 __u64 block_bitmap;
290 __u64 inode_bitmap;
291 __u64 inode_table;
292 __u32 blocks_count;
293 __u16 reserved_blocks;
294 __u16 unused;
295 __u32 free_blocks_count;
296 };
297
298 /*
299 * Following is used by preallocation code to tell get_blocks() that we
300 * want uninitialzed extents.
301 */
302 #define EXT4_CREATE_UNINITIALIZED_EXT 2
303
304 /*
305 * ioctl commands
306 */
307 #define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS
308 #define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS
309 #define EXT4_IOC_GETVERSION _IOR('f', 3, long)
310 #define EXT4_IOC_SETVERSION _IOW('f', 4, long)
311 #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION
312 #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION
313 #ifdef CONFIG_JBD2_DEBUG
314 #define EXT4_IOC_WAIT_FOR_READONLY _IOR('f', 99, long)
315 #endif
316 #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long)
317 #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long)
318 #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long)
319 #define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input)
320 #define EXT4_IOC_MIGRATE _IO('f', 9)
321 /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */
322 /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */
323 #define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12)
324
325 /*
326 * ioctl commands in 32 bit emulation
327 */
328 #define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS
329 #define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS
330 #define EXT4_IOC32_GETVERSION _IOR('f', 3, int)
331 #define EXT4_IOC32_SETVERSION _IOW('f', 4, int)
332 #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int)
333 #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int)
334 #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int)
335 #ifdef CONFIG_JBD2_DEBUG
336 #define EXT4_IOC32_WAIT_FOR_READONLY _IOR('f', 99, int)
337 #endif
338 #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION
339 #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION
340
341
342 /*
343 * Mount options
344 */
345 struct ext4_mount_options {
346 unsigned long s_mount_opt;
347 uid_t s_resuid;
348 gid_t s_resgid;
349 unsigned long s_commit_interval;
350 u32 s_min_batch_time, s_max_batch_time;
351 #ifdef CONFIG_QUOTA
352 int s_jquota_fmt;
353 char *s_qf_names[MAXQUOTAS];
354 #endif
355 };
356
357 /*
358 * Structure of an inode on the disk
359 */
360 struct ext4_inode {
361 __le16 i_mode; /* File mode */
362 __le16 i_uid; /* Low 16 bits of Owner Uid */
363 __le32 i_size_lo; /* Size in bytes */
364 __le32 i_atime; /* Access time */
365 __le32 i_ctime; /* Inode Change time */
366 __le32 i_mtime; /* Modification time */
367 __le32 i_dtime; /* Deletion Time */
368 __le16 i_gid; /* Low 16 bits of Group Id */
369 __le16 i_links_count; /* Links count */
370 __le32 i_blocks_lo; /* Blocks count */
371 __le32 i_flags; /* File flags */
372 union {
373 struct {
374 __le32 l_i_version;
375 } linux1;
376 struct {
377 __u32 h_i_translator;
378 } hurd1;
379 struct {
380 __u32 m_i_reserved1;
381 } masix1;
382 } osd1; /* OS dependent 1 */
383 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
384 __le32 i_generation; /* File version (for NFS) */
385 __le32 i_file_acl_lo; /* File ACL */
386 __le32 i_size_high;
387 __le32 i_obso_faddr; /* Obsoleted fragment address */
388 union {
389 struct {
390 __le16 l_i_blocks_high; /* were l_i_reserved1 */
391 __le16 l_i_file_acl_high;
392 __le16 l_i_uid_high; /* these 2 fields */
393 __le16 l_i_gid_high; /* were reserved2[0] */
394 __u32 l_i_reserved2;
395 } linux2;
396 struct {
397 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
398 __u16 h_i_mode_high;
399 __u16 h_i_uid_high;
400 __u16 h_i_gid_high;
401 __u32 h_i_author;
402 } hurd2;
403 struct {
404 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
405 __le16 m_i_file_acl_high;
406 __u32 m_i_reserved2[2];
407 } masix2;
408 } osd2; /* OS dependent 2 */
409 __le16 i_extra_isize;
410 __le16 i_pad1;
411 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */
412 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */
413 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */
414 __le32 i_crtime; /* File Creation time */
415 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */
416 __le32 i_version_hi; /* high 32 bits for 64-bit version */
417 };
418
419
420 #define EXT4_EPOCH_BITS 2
421 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
422 #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS)
423
424 /*
425 * Extended fields will fit into an inode if the filesystem was formatted
426 * with large inodes (-I 256 or larger) and there are not currently any EAs
427 * consuming all of the available space. For new inodes we always reserve
428 * enough space for the kernel's known extended fields, but for inodes
429 * created with an old kernel this might not have been the case. None of
430 * the extended inode fields is critical for correct filesystem operation.
431 * This macro checks if a certain field fits in the inode. Note that
432 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
433 */
434 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \
435 ((offsetof(typeof(*ext4_inode), field) + \
436 sizeof((ext4_inode)->field)) \
437 <= (EXT4_GOOD_OLD_INODE_SIZE + \
438 (einode)->i_extra_isize)) \
439
440 static inline __le32 ext4_encode_extra_time(struct timespec *time)
441 {
442 return cpu_to_le32((sizeof(time->tv_sec) > 4 ?
443 time->tv_sec >> 32 : 0) |
444 ((time->tv_nsec << 2) & EXT4_NSEC_MASK));
445 }
446
447 static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra)
448 {
449 if (sizeof(time->tv_sec) > 4)
450 time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK)
451 << 32;
452 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> 2;
453 }
454
455 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \
456 do { \
457 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \
458 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
459 (raw_inode)->xtime ## _extra = \
460 ext4_encode_extra_time(&(inode)->xtime); \
461 } while (0)
462
463 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \
464 do { \
465 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
466 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \
467 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
468 (raw_inode)->xtime ## _extra = \
469 ext4_encode_extra_time(&(einode)->xtime); \
470 } while (0)
471
472 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \
473 do { \
474 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \
475 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
476 ext4_decode_extra_time(&(inode)->xtime, \
477 raw_inode->xtime ## _extra); \
478 } while (0)
479
480 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \
481 do { \
482 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
483 (einode)->xtime.tv_sec = \
484 (signed)le32_to_cpu((raw_inode)->xtime); \
485 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
486 ext4_decode_extra_time(&(einode)->xtime, \
487 raw_inode->xtime ## _extra); \
488 } while (0)
489
490 #define i_disk_version osd1.linux1.l_i_version
491
492 #if defined(__KERNEL__) || defined(__linux__)
493 #define i_reserved1 osd1.linux1.l_i_reserved1
494 #define i_file_acl_high osd2.linux2.l_i_file_acl_high
495 #define i_blocks_high osd2.linux2.l_i_blocks_high
496 #define i_uid_low i_uid
497 #define i_gid_low i_gid
498 #define i_uid_high osd2.linux2.l_i_uid_high
499 #define i_gid_high osd2.linux2.l_i_gid_high
500 #define i_reserved2 osd2.linux2.l_i_reserved2
501
502 #elif defined(__GNU__)
503
504 #define i_translator osd1.hurd1.h_i_translator
505 #define i_uid_high osd2.hurd2.h_i_uid_high
506 #define i_gid_high osd2.hurd2.h_i_gid_high
507 #define i_author osd2.hurd2.h_i_author
508
509 #elif defined(__masix__)
510
511 #define i_reserved1 osd1.masix1.m_i_reserved1
512 #define i_file_acl_high osd2.masix2.m_i_file_acl_high
513 #define i_reserved2 osd2.masix2.m_i_reserved2
514
515 #endif /* defined(__KERNEL__) || defined(__linux__) */
516
517 /*
518 * File system states
519 */
520 #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */
521 #define EXT4_ERROR_FS 0x0002 /* Errors detected */
522 #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */
523
524 /*
525 * Misc. filesystem flags
526 */
527 #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */
528 #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */
529 #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */
530
531 /*
532 * Mount flags
533 */
534 #define EXT4_MOUNT_OLDALLOC 0x00002 /* Don't use the new Orlov allocator */
535 #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */
536 #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */
537 #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */
538 #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */
539 #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */
540 #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */
541 #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/
542 #define EXT4_MOUNT_ABORT 0x00200 /* Fatal error detected */
543 #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */
544 #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */
545 #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */
546 #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */
547 #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */
548 #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */
549 #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */
550 #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */
551 #define EXT4_MOUNT_RESERVATION 0x10000 /* Preallocation */
552 #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */
553 #define EXT4_MOUNT_NOBH 0x40000 /* No bufferheads */
554 #define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */
555 #define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */
556 #define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */
557 #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */
558 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */
559 #define EXT4_MOUNT_I_VERSION 0x2000000 /* i_version support */
560 #define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */
561 #define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */
562
563 /* Compatibility, for having both ext2_fs.h and ext4_fs.h included at once */
564 #ifndef _LINUX_EXT2_FS_H
565 #define clear_opt(o, opt) o &= ~EXT4_MOUNT_##opt
566 #define set_opt(o, opt) o |= EXT4_MOUNT_##opt
567 #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \
568 EXT4_MOUNT_##opt)
569 #else
570 #define EXT2_MOUNT_NOLOAD EXT4_MOUNT_NOLOAD
571 #define EXT2_MOUNT_ABORT EXT4_MOUNT_ABORT
572 #define EXT2_MOUNT_DATA_FLAGS EXT4_MOUNT_DATA_FLAGS
573 #endif
574
575 #define ext4_set_bit ext2_set_bit
576 #define ext4_set_bit_atomic ext2_set_bit_atomic
577 #define ext4_clear_bit ext2_clear_bit
578 #define ext4_clear_bit_atomic ext2_clear_bit_atomic
579 #define ext4_test_bit ext2_test_bit
580 #define ext4_find_first_zero_bit ext2_find_first_zero_bit
581 #define ext4_find_next_zero_bit ext2_find_next_zero_bit
582 #define ext4_find_next_bit ext2_find_next_bit
583
584 /*
585 * Maximal mount counts between two filesystem checks
586 */
587 #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
588 #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */
589
590 /*
591 * Behaviour when detecting errors
592 */
593 #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */
594 #define EXT4_ERRORS_RO 2 /* Remount fs read-only */
595 #define EXT4_ERRORS_PANIC 3 /* Panic */
596 #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE
597
598 /*
599 * Structure of the super block
600 */
601 struct ext4_super_block {
602 /*00*/ __le32 s_inodes_count; /* Inodes count */
603 __le32 s_blocks_count_lo; /* Blocks count */
604 __le32 s_r_blocks_count_lo; /* Reserved blocks count */
605 __le32 s_free_blocks_count_lo; /* Free blocks count */
606 /*10*/ __le32 s_free_inodes_count; /* Free inodes count */
607 __le32 s_first_data_block; /* First Data Block */
608 __le32 s_log_block_size; /* Block size */
609 __le32 s_obso_log_frag_size; /* Obsoleted fragment size */
610 /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */
611 __le32 s_obso_frags_per_group; /* Obsoleted fragments per group */
612 __le32 s_inodes_per_group; /* # Inodes per group */
613 __le32 s_mtime; /* Mount time */
614 /*30*/ __le32 s_wtime; /* Write time */
615 __le16 s_mnt_count; /* Mount count */
616 __le16 s_max_mnt_count; /* Maximal mount count */
617 __le16 s_magic; /* Magic signature */
618 __le16 s_state; /* File system state */
619 __le16 s_errors; /* Behaviour when detecting errors */
620 __le16 s_minor_rev_level; /* minor revision level */
621 /*40*/ __le32 s_lastcheck; /* time of last check */
622 __le32 s_checkinterval; /* max. time between checks */
623 __le32 s_creator_os; /* OS */
624 __le32 s_rev_level; /* Revision level */
625 /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */
626 __le16 s_def_resgid; /* Default gid for reserved blocks */
627 /*
628 * These fields are for EXT4_DYNAMIC_REV superblocks only.
629 *
630 * Note: the difference between the compatible feature set and
631 * the incompatible feature set is that if there is a bit set
632 * in the incompatible feature set that the kernel doesn't
633 * know about, it should refuse to mount the filesystem.
634 *
635 * e2fsck's requirements are more strict; if it doesn't know
636 * about a feature in either the compatible or incompatible
637 * feature set, it must abort and not try to meddle with
638 * things it doesn't understand...
639 */
640 __le32 s_first_ino; /* First non-reserved inode */
641 __le16 s_inode_size; /* size of inode structure */
642 __le16 s_block_group_nr; /* block group # of this superblock */
643 __le32 s_feature_compat; /* compatible feature set */
644 /*60*/ __le32 s_feature_incompat; /* incompatible feature set */
645 __le32 s_feature_ro_compat; /* readonly-compatible feature set */
646 /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */
647 /*78*/ char s_volume_name[16]; /* volume name */
648 /*88*/ char s_last_mounted[64]; /* directory where last mounted */
649 /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */
650 /*
651 * Performance hints. Directory preallocation should only
652 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
653 */
654 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/
655 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */
656 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */
657 /*
658 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
659 */
660 /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */
661 /*E0*/ __le32 s_journal_inum; /* inode number of journal file */
662 __le32 s_journal_dev; /* device number of journal file */
663 __le32 s_last_orphan; /* start of list of inodes to delete */
664 __le32 s_hash_seed[4]; /* HTREE hash seed */
665 __u8 s_def_hash_version; /* Default hash version to use */
666 __u8 s_reserved_char_pad;
667 __le16 s_desc_size; /* size of group descriptor */
668 /*100*/ __le32 s_default_mount_opts;
669 __le32 s_first_meta_bg; /* First metablock block group */
670 __le32 s_mkfs_time; /* When the filesystem was created */
671 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */
672 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
673 /*150*/ __le32 s_blocks_count_hi; /* Blocks count */
674 __le32 s_r_blocks_count_hi; /* Reserved blocks count */
675 __le32 s_free_blocks_count_hi; /* Free blocks count */
676 __le16 s_min_extra_isize; /* All inodes have at least # bytes */
677 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */
678 __le32 s_flags; /* Miscellaneous flags */
679 __le16 s_raid_stride; /* RAID stride */
680 __le16 s_mmp_interval; /* # seconds to wait in MMP checking */
681 __le64 s_mmp_block; /* Block for multi-mount protection */
682 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/
683 __u8 s_log_groups_per_flex; /* FLEX_BG group size */
684 __u8 s_reserved_char_pad2;
685 __le16 s_reserved_pad;
686 __u32 s_reserved[162]; /* Padding to the end of the block */
687 };
688
689 #ifdef __KERNEL__
690 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb)
691 {
692 return sb->s_fs_info;
693 }
694 static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
695 {
696 return container_of(inode, struct ext4_inode_info, vfs_inode);
697 }
698
699 static inline struct timespec ext4_current_time(struct inode *inode)
700 {
701 return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ?
702 current_fs_time(inode->i_sb) : CURRENT_TIME_SEC;
703 }
704
705
706 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
707 {
708 return ino == EXT4_ROOT_INO ||
709 ino == EXT4_JOURNAL_INO ||
710 ino == EXT4_RESIZE_INO ||
711 (ino >= EXT4_FIRST_INO(sb) &&
712 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
713 }
714 #else
715 /* Assume that user mode programs are passing in an ext4fs superblock, not
716 * a kernel struct super_block. This will allow us to call the feature-test
717 * macros from user land. */
718 #define EXT4_SB(sb) (sb)
719 #endif
720
721 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
722
723 /*
724 * Codes for operating systems
725 */
726 #define EXT4_OS_LINUX 0
727 #define EXT4_OS_HURD 1
728 #define EXT4_OS_MASIX 2
729 #define EXT4_OS_FREEBSD 3
730 #define EXT4_OS_LITES 4
731
732 /*
733 * Revision levels
734 */
735 #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */
736 #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
737
738 #define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV
739 #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV
740
741 #define EXT4_GOOD_OLD_INODE_SIZE 128
742
743 /*
744 * Feature set definitions
745 */
746
747 #define EXT4_HAS_COMPAT_FEATURE(sb,mask) \
748 ((EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask)) != 0)
749 #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \
750 ((EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask)) != 0)
751 #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \
752 ((EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask)) != 0)
753 #define EXT4_SET_COMPAT_FEATURE(sb,mask) \
754 EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
755 #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \
756 EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
757 #define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \
758 EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
759 #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \
760 EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
761 #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \
762 EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
763 #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \
764 EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
765
766 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001
767 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002
768 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004
769 #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008
770 #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010
771 #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020
772
773 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
774 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
775 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
776 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008
777 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010
778 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020
779 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040
780
781 #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001
782 #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002
783 #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */
784 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */
785 #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010
786 #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */
787 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080
788 #define EXT4_FEATURE_INCOMPAT_MMP 0x0100
789 #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200
790
791 #define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR
792 #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
793 EXT4_FEATURE_INCOMPAT_RECOVER| \
794 EXT4_FEATURE_INCOMPAT_META_BG| \
795 EXT4_FEATURE_INCOMPAT_EXTENTS| \
796 EXT4_FEATURE_INCOMPAT_64BIT| \
797 EXT4_FEATURE_INCOMPAT_FLEX_BG)
798 #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
799 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
800 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
801 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
802 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
803 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
804 EXT4_FEATURE_RO_COMPAT_HUGE_FILE)
805
806 /*
807 * Default values for user and/or group using reserved blocks
808 */
809 #define EXT4_DEF_RESUID 0
810 #define EXT4_DEF_RESGID 0
811
812 #define EXT4_DEF_INODE_READAHEAD_BLKS 32
813
814 /*
815 * Default mount options
816 */
817 #define EXT4_DEFM_DEBUG 0x0001
818 #define EXT4_DEFM_BSDGROUPS 0x0002
819 #define EXT4_DEFM_XATTR_USER 0x0004
820 #define EXT4_DEFM_ACL 0x0008
821 #define EXT4_DEFM_UID16 0x0010
822 #define EXT4_DEFM_JMODE 0x0060
823 #define EXT4_DEFM_JMODE_DATA 0x0020
824 #define EXT4_DEFM_JMODE_ORDERED 0x0040
825 #define EXT4_DEFM_JMODE_WBACK 0x0060
826
827 /*
828 * Default journal batch times
829 */
830 #define EXT4_DEF_MIN_BATCH_TIME 0
831 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */
832
833 /*
834 * Minimum number of groups in a flexgroup before we separate out
835 * directories into the first block group of a flexgroup
836 */
837 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4
838
839 /*
840 * Structure of a directory entry
841 */
842 #define EXT4_NAME_LEN 255
843
844 struct ext4_dir_entry {
845 __le32 inode; /* Inode number */
846 __le16 rec_len; /* Directory entry length */
847 __le16 name_len; /* Name length */
848 char name[EXT4_NAME_LEN]; /* File name */
849 };
850
851 /*
852 * The new version of the directory entry. Since EXT4 structures are
853 * stored in intel byte order, and the name_len field could never be
854 * bigger than 255 chars, it's safe to reclaim the extra byte for the
855 * file_type field.
856 */
857 struct ext4_dir_entry_2 {
858 __le32 inode; /* Inode number */
859 __le16 rec_len; /* Directory entry length */
860 __u8 name_len; /* Name length */
861 __u8 file_type;
862 char name[EXT4_NAME_LEN]; /* File name */
863 };
864
865 /*
866 * Ext4 directory file types. Only the low 3 bits are used. The
867 * other bits are reserved for now.
868 */
869 #define EXT4_FT_UNKNOWN 0
870 #define EXT4_FT_REG_FILE 1
871 #define EXT4_FT_DIR 2
872 #define EXT4_FT_CHRDEV 3
873 #define EXT4_FT_BLKDEV 4
874 #define EXT4_FT_FIFO 5
875 #define EXT4_FT_SOCK 6
876 #define EXT4_FT_SYMLINK 7
877
878 #define EXT4_FT_MAX 8
879
880 /*
881 * EXT4_DIR_PAD defines the directory entries boundaries
882 *
883 * NOTE: It must be a multiple of 4
884 */
885 #define EXT4_DIR_PAD 4
886 #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1)
887 #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \
888 ~EXT4_DIR_ROUND)
889 #define EXT4_MAX_REC_LEN ((1<<16)-1)
890
891 /*
892 * Hash Tree Directory indexing
893 * (c) Daniel Phillips, 2001
894 */
895
896 #define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \
897 EXT4_FEATURE_COMPAT_DIR_INDEX) && \
898 (EXT4_I(dir)->i_flags & EXT4_INDEX_FL))
899 #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX)
900 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
901
902 /* Legal values for the dx_root hash_version field: */
903
904 #define DX_HASH_LEGACY 0
905 #define DX_HASH_HALF_MD4 1
906 #define DX_HASH_TEA 2
907 #define DX_HASH_LEGACY_UNSIGNED 3
908 #define DX_HASH_HALF_MD4_UNSIGNED 4
909 #define DX_HASH_TEA_UNSIGNED 5
910
911 #ifdef __KERNEL__
912
913 /* hash info structure used by the directory hash */
914 struct dx_hash_info
915 {
916 u32 hash;
917 u32 minor_hash;
918 int hash_version;
919 u32 *seed;
920 };
921
922 #define EXT4_HTREE_EOF 0x7fffffff
923
924 /*
925 * Control parameters used by ext4_htree_next_block
926 */
927 #define HASH_NB_ALWAYS 1
928
929
930 /*
931 * Describe an inode's exact location on disk and in memory
932 */
933 struct ext4_iloc
934 {
935 struct buffer_head *bh;
936 unsigned long offset;
937 ext4_group_t block_group;
938 };
939
940 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
941 {
942 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
943 }
944
945 /*
946 * This structure is stuffed into the struct file's private_data field
947 * for directories. It is where we put information so that we can do
948 * readdir operations in hash tree order.
949 */
950 struct dir_private_info {
951 struct rb_root root;
952 struct rb_node *curr_node;
953 struct fname *extra_fname;
954 loff_t last_pos;
955 __u32 curr_hash;
956 __u32 curr_minor_hash;
957 __u32 next_hash;
958 };
959
960 /* calculate the first block number of the group */
961 static inline ext4_fsblk_t
962 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no)
963 {
964 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
965 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
966 }
967
968 /*
969 * Special error return code only used by dx_probe() and its callers.
970 */
971 #define ERR_BAD_DX_DIR -75000
972
973 void ext4_get_group_no_and_offset(struct super_block *sb, ext4_fsblk_t blocknr,
974 ext4_group_t *blockgrpp, ext4_grpblk_t *offsetp);
975
976 extern struct proc_dir_entry *ext4_proc_root;
977
978 #ifdef CONFIG_PROC_FS
979 extern const struct file_operations ext4_ui_proc_fops;
980
981 #define EXT4_PROC_HANDLER(name, var) \
982 do { \
983 proc = proc_create_data(name, mode, sbi->s_proc, \
984 &ext4_ui_proc_fops, &sbi->s_##var); \
985 if (proc == NULL) { \
986 printk(KERN_ERR "EXT4-fs: can't create %s\n", name); \
987 goto err_out; \
988 } \
989 } while (0)
990 #else
991 #define EXT4_PROC_HANDLER(name, var)
992 #endif
993
994 /*
995 * Function prototypes
996 */
997
998 /*
999 * Ok, these declarations are also in <linux/kernel.h> but none of the
1000 * ext4 source programs needs to include it so they are duplicated here.
1001 */
1002 # define NORET_TYPE /**/
1003 # define ATTRIB_NORET __attribute__((noreturn))
1004 # define NORET_AND noreturn,
1005
1006 /* bitmap.c */
1007 extern unsigned int ext4_count_free(struct buffer_head *, unsigned);
1008
1009 /* balloc.c */
1010 extern unsigned int ext4_block_group(struct super_block *sb,
1011 ext4_fsblk_t blocknr);
1012 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb,
1013 ext4_fsblk_t blocknr);
1014 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group);
1015 extern unsigned long ext4_bg_num_gdb(struct super_block *sb,
1016 ext4_group_t group);
1017 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,
1018 ext4_fsblk_t goal, unsigned long *count, int *errp);
1019 extern int ext4_claim_free_blocks(struct ext4_sb_info *sbi, s64 nblocks);
1020 extern int ext4_has_free_blocks(struct ext4_sb_info *sbi, s64 nblocks);
1021 extern void ext4_free_blocks(handle_t *handle, struct inode *inode,
1022 ext4_fsblk_t block, unsigned long count, int metadata);
1023 extern void ext4_add_groupblocks(handle_t *handle, struct super_block *sb,
1024 ext4_fsblk_t block, unsigned long count);
1025 extern ext4_fsblk_t ext4_count_free_blocks(struct super_block *);
1026 extern void ext4_check_blocks_bitmap(struct super_block *);
1027 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
1028 ext4_group_t block_group,
1029 struct buffer_head ** bh);
1030 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
1031
1032 /* dir.c */
1033 extern int ext4_check_dir_entry(const char *, struct inode *,
1034 struct ext4_dir_entry_2 *,
1035 struct buffer_head *, unsigned int);
1036 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
1037 __u32 minor_hash,
1038 struct ext4_dir_entry_2 *dirent);
1039 extern void ext4_htree_free_dir_info(struct dir_private_info *p);
1040
1041 /* fsync.c */
1042 extern int ext4_sync_file(struct file *, struct dentry *, int);
1043
1044 /* hash.c */
1045 extern int ext4fs_dirhash(const char *name, int len, struct
1046 dx_hash_info *hinfo);
1047
1048 /* ialloc.c */
1049 extern struct inode * ext4_new_inode(handle_t *, struct inode *, int);
1050 extern void ext4_free_inode(handle_t *, struct inode *);
1051 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long);
1052 extern unsigned long ext4_count_free_inodes(struct super_block *);
1053 extern unsigned long ext4_count_dirs(struct super_block *);
1054 extern void ext4_check_inodes_bitmap(struct super_block *);
1055
1056 /* mballoc.c */
1057 extern long ext4_mb_stats;
1058 extern long ext4_mb_max_to_scan;
1059 extern int ext4_mb_init(struct super_block *, int);
1060 extern int ext4_mb_release(struct super_block *);
1061 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *,
1062 struct ext4_allocation_request *, int *);
1063 extern int ext4_mb_reserve_blocks(struct super_block *, int);
1064 extern void ext4_discard_preallocations(struct inode *);
1065 extern int __init init_ext4_mballoc(void);
1066 extern void exit_ext4_mballoc(void);
1067 extern void ext4_mb_free_blocks(handle_t *, struct inode *,
1068 unsigned long, unsigned long, int, unsigned long *);
1069 extern int ext4_mb_add_groupinfo(struct super_block *sb,
1070 ext4_group_t i, struct ext4_group_desc *desc);
1071 extern void ext4_mb_update_group_info(struct ext4_group_info *grp,
1072 ext4_grpblk_t add);
1073 extern int ext4_mb_get_buddy_cache_lock(struct super_block *, ext4_group_t);
1074 extern void ext4_mb_put_buddy_cache_lock(struct super_block *,
1075 ext4_group_t, int);
1076 /* inode.c */
1077 int ext4_forget(handle_t *handle, int is_metadata, struct inode *inode,
1078 struct buffer_head *bh, ext4_fsblk_t blocknr);
1079 struct buffer_head *ext4_getblk(handle_t *, struct inode *,
1080 ext4_lblk_t, int, int *);
1081 struct buffer_head *ext4_bread(handle_t *, struct inode *,
1082 ext4_lblk_t, int, int *);
1083 int ext4_get_block(struct inode *inode, sector_t iblock,
1084 struct buffer_head *bh_result, int create);
1085
1086 extern struct inode *ext4_iget(struct super_block *, unsigned long);
1087 extern int ext4_write_inode(struct inode *, int);
1088 extern int ext4_setattr(struct dentry *, struct iattr *);
1089 extern int ext4_getattr(struct vfsmount *mnt, struct dentry *dentry,
1090 struct kstat *stat);
1091 extern void ext4_delete_inode(struct inode *);
1092 extern int ext4_sync_inode(handle_t *, struct inode *);
1093 extern void ext4_dirty_inode(struct inode *);
1094 extern int ext4_change_inode_journal_flag(struct inode *, int);
1095 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
1096 extern int ext4_can_truncate(struct inode *inode);
1097 extern void ext4_truncate(struct inode *);
1098 extern void ext4_set_inode_flags(struct inode *);
1099 extern void ext4_get_inode_flags(struct ext4_inode_info *);
1100 extern int ext4_alloc_da_blocks(struct inode *inode);
1101 extern void ext4_set_aops(struct inode *inode);
1102 extern int ext4_writepage_trans_blocks(struct inode *);
1103 extern int ext4_meta_trans_blocks(struct inode *, int nrblocks, int idxblocks);
1104 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks);
1105 extern int ext4_block_truncate_page(handle_t *handle,
1106 struct address_space *mapping, loff_t from);
1107 extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct page *page);
1108 extern qsize_t ext4_get_reserved_space(struct inode *inode);
1109
1110 /* ioctl.c */
1111 extern long ext4_ioctl(struct file *, unsigned int, unsigned long);
1112 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long);
1113
1114 /* migrate.c */
1115 extern int ext4_ext_migrate(struct inode *);
1116
1117 /* namei.c */
1118 extern unsigned int ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize);
1119 extern __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize);
1120 extern int ext4_orphan_add(handle_t *, struct inode *);
1121 extern int ext4_orphan_del(handle_t *, struct inode *);
1122 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
1123 __u32 start_minor_hash, __u32 *next_hash);
1124
1125 /* resize.c */
1126 extern int ext4_group_add(struct super_block *sb,
1127 struct ext4_new_group_data *input);
1128 extern int ext4_group_extend(struct super_block *sb,
1129 struct ext4_super_block *es,
1130 ext4_fsblk_t n_blocks_count);
1131
1132 /* super.c */
1133 extern void ext4_error(struct super_block *, const char *, const char *, ...)
1134 __attribute__ ((format (printf, 3, 4)));
1135 extern void __ext4_std_error(struct super_block *, const char *, int);
1136 extern void ext4_abort(struct super_block *, const char *, const char *, ...)
1137 __attribute__ ((format (printf, 3, 4)));
1138 extern void ext4_warning(struct super_block *, const char *, const char *, ...)
1139 __attribute__ ((format (printf, 3, 4)));
1140 extern void ext4_grp_locked_error(struct super_block *, ext4_group_t,
1141 const char *, const char *, ...)
1142 __attribute__ ((format (printf, 4, 5)));
1143 extern void ext4_update_dynamic_rev(struct super_block *sb);
1144 extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb,
1145 __u32 compat);
1146 extern int ext4_update_rocompat_feature(handle_t *handle,
1147 struct super_block *sb, __u32 rocompat);
1148 extern int ext4_update_incompat_feature(handle_t *handle,
1149 struct super_block *sb, __u32 incompat);
1150 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
1151 struct ext4_group_desc *bg);
1152 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
1153 struct ext4_group_desc *bg);
1154 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
1155 struct ext4_group_desc *bg);
1156 extern __u32 ext4_free_blks_count(struct super_block *sb,
1157 struct ext4_group_desc *bg);
1158 extern __u32 ext4_free_inodes_count(struct super_block *sb,
1159 struct ext4_group_desc *bg);
1160 extern __u32 ext4_used_dirs_count(struct super_block *sb,
1161 struct ext4_group_desc *bg);
1162 extern __u32 ext4_itable_unused_count(struct super_block *sb,
1163 struct ext4_group_desc *bg);
1164 extern void ext4_block_bitmap_set(struct super_block *sb,
1165 struct ext4_group_desc *bg, ext4_fsblk_t blk);
1166 extern void ext4_inode_bitmap_set(struct super_block *sb,
1167 struct ext4_group_desc *bg, ext4_fsblk_t blk);
1168 extern void ext4_inode_table_set(struct super_block *sb,
1169 struct ext4_group_desc *bg, ext4_fsblk_t blk);
1170 extern void ext4_free_blks_set(struct super_block *sb,
1171 struct ext4_group_desc *bg, __u32 count);
1172 extern void ext4_free_inodes_set(struct super_block *sb,
1173 struct ext4_group_desc *bg, __u32 count);
1174 extern void ext4_used_dirs_set(struct super_block *sb,
1175 struct ext4_group_desc *bg, __u32 count);
1176 extern void ext4_itable_unused_set(struct super_block *sb,
1177 struct ext4_group_desc *bg, __u32 count);
1178
1179 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
1180 {
1181 return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) |
1182 le32_to_cpu(es->s_blocks_count_lo);
1183 }
1184
1185 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
1186 {
1187 return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) |
1188 le32_to_cpu(es->s_r_blocks_count_lo);
1189 }
1190
1191 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
1192 {
1193 return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) |
1194 le32_to_cpu(es->s_free_blocks_count_lo);
1195 }
1196
1197 static inline void ext4_blocks_count_set(struct ext4_super_block *es,
1198 ext4_fsblk_t blk)
1199 {
1200 es->s_blocks_count_lo = cpu_to_le32((u32)blk);
1201 es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
1202 }
1203
1204 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
1205 ext4_fsblk_t blk)
1206 {
1207 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk);
1208 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
1209 }
1210
1211 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
1212 ext4_fsblk_t blk)
1213 {
1214 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk);
1215 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
1216 }
1217
1218 static inline loff_t ext4_isize(struct ext4_inode *raw_inode)
1219 {
1220 if (S_ISREG(le16_to_cpu(raw_inode->i_mode)))
1221 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) |
1222 le32_to_cpu(raw_inode->i_size_lo);
1223 else
1224 return (loff_t) le32_to_cpu(raw_inode->i_size_lo);
1225 }
1226
1227 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size)
1228 {
1229 raw_inode->i_size_lo = cpu_to_le32(i_size);
1230 raw_inode->i_size_high = cpu_to_le32(i_size >> 32);
1231 }
1232
1233 static inline
1234 struct ext4_group_info *ext4_get_group_info(struct super_block *sb,
1235 ext4_group_t group)
1236 {
1237 struct ext4_group_info ***grp_info;
1238 long indexv, indexh;
1239 grp_info = EXT4_SB(sb)->s_group_info;
1240 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb));
1241 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1);
1242 return grp_info[indexv][indexh];
1243 }
1244
1245
1246 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi,
1247 ext4_group_t block_group)
1248 {
1249 return block_group >> sbi->s_log_groups_per_flex;
1250 }
1251
1252 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi)
1253 {
1254 return 1 << sbi->s_log_groups_per_flex;
1255 }
1256
1257 #define ext4_std_error(sb, errno) \
1258 do { \
1259 if ((errno)) \
1260 __ext4_std_error((sb), __func__, (errno)); \
1261 } while (0)
1262
1263 #ifdef CONFIG_SMP
1264 /* Each CPU can accumulate percpu_counter_batch blocks in their local
1265 * counters. So we need to make sure we have free blocks more
1266 * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times.
1267 */
1268 #define EXT4_FREEBLOCKS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids))
1269 #else
1270 #define EXT4_FREEBLOCKS_WATERMARK 0
1271 #endif
1272
1273 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize)
1274 {
1275 /*
1276 * XXX: replace with spinlock if seen contended -bzzz
1277 */
1278 down_write(&EXT4_I(inode)->i_data_sem);
1279 if (newsize > EXT4_I(inode)->i_disksize)
1280 EXT4_I(inode)->i_disksize = newsize;
1281 up_write(&EXT4_I(inode)->i_data_sem);
1282 return ;
1283 }
1284
1285 struct ext4_group_info {
1286 unsigned long bb_state;
1287 struct rb_root bb_free_root;
1288 unsigned short bb_first_free;
1289 unsigned short bb_free;
1290 unsigned short bb_fragments;
1291 struct list_head bb_prealloc_list;
1292 #ifdef DOUBLE_CHECK
1293 void *bb_bitmap;
1294 #endif
1295 struct rw_semaphore alloc_sem;
1296 unsigned short bb_counters[];
1297 };
1298
1299 #define EXT4_GROUP_INFO_NEED_INIT_BIT 0
1300 #define EXT4_GROUP_INFO_LOCKED_BIT 1
1301
1302 #define EXT4_MB_GRP_NEED_INIT(grp) \
1303 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state)))
1304
1305 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group)
1306 {
1307 struct ext4_group_info *grinfo = ext4_get_group_info(sb, group);
1308
1309 bit_spin_lock(EXT4_GROUP_INFO_LOCKED_BIT, &(grinfo->bb_state));
1310 }
1311
1312 static inline void ext4_unlock_group(struct super_block *sb,
1313 ext4_group_t group)
1314 {
1315 struct ext4_group_info *grinfo = ext4_get_group_info(sb, group);
1316
1317 bit_spin_unlock(EXT4_GROUP_INFO_LOCKED_BIT, &(grinfo->bb_state));
1318 }
1319
1320 static inline int ext4_is_group_locked(struct super_block *sb,
1321 ext4_group_t group)
1322 {
1323 struct ext4_group_info *grinfo = ext4_get_group_info(sb, group);
1324
1325 return bit_spin_is_locked(EXT4_GROUP_INFO_LOCKED_BIT,
1326 &(grinfo->bb_state));
1327 }
1328
1329 /*
1330 * Inodes and files operations
1331 */
1332
1333 /* dir.c */
1334 extern const struct file_operations ext4_dir_operations;
1335
1336 /* file.c */
1337 extern const struct inode_operations ext4_file_inode_operations;
1338 extern const struct file_operations ext4_file_operations;
1339
1340 /* namei.c */
1341 extern const struct inode_operations ext4_dir_inode_operations;
1342 extern const struct inode_operations ext4_special_inode_operations;
1343
1344 /* symlink.c */
1345 extern const struct inode_operations ext4_symlink_inode_operations;
1346 extern const struct inode_operations ext4_fast_symlink_inode_operations;
1347
1348 /* extents.c */
1349 extern int ext4_ext_tree_init(handle_t *handle, struct inode *);
1350 extern int ext4_ext_writepage_trans_blocks(struct inode *, int);
1351 extern int ext4_ext_index_trans_blocks(struct inode *inode, int nrblocks,
1352 int chunk);
1353 extern int ext4_ext_get_blocks(handle_t *handle, struct inode *inode,
1354 ext4_lblk_t iblock, unsigned int max_blocks,
1355 struct buffer_head *bh_result,
1356 int create, int extend_disksize);
1357 extern void ext4_ext_truncate(struct inode *);
1358 extern void ext4_ext_init(struct super_block *);
1359 extern void ext4_ext_release(struct super_block *);
1360 extern long ext4_fallocate(struct inode *inode, int mode, loff_t offset,
1361 loff_t len);
1362 extern int ext4_get_blocks_wrap(handle_t *handle, struct inode *inode,
1363 sector_t block, unsigned int max_blocks,
1364 struct buffer_head *bh, int create,
1365 int extend_disksize, int flag);
1366 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
1367 __u64 start, __u64 len);
1368
1369 /*
1370 * Add new method to test wether block and inode bitmaps are properly
1371 * initialized. With uninit_bg reading the block from disk is not enough
1372 * to mark the bitmap uptodate. We need to also zero-out the bitmap
1373 */
1374 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart
1375
1376 static inline int bitmap_uptodate(struct buffer_head *bh)
1377 {
1378 return (buffer_uptodate(bh) &&
1379 test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state));
1380 }
1381 static inline void set_bitmap_uptodate(struct buffer_head *bh)
1382 {
1383 set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state);
1384 }
1385
1386 #endif /* __KERNEL__ */
1387
1388 #endif /* _EXT4_H */
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