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ext4: add EXT4_IOC_ALLOC_DA_BLKS ioctl
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / fs / ext4 / ext4.h
blobb0ea70cc94dbe696bb0460e77be1c73a069426be
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
274 /* Used to pass group descriptor data when online resize is done */
275 struct ext4_new_group_input {
276 __u32 group; /* Group number for this data */
277 __u64 block_bitmap; /* Absolute block number of block bitmap */
278 __u64 inode_bitmap; /* Absolute block number of inode bitmap */
279 __u64 inode_table; /* Absolute block number of inode table start */
280 __u32 blocks_count; /* Total number of blocks in this group */
281 __u16 reserved_blocks; /* Number of reserved blocks in this group */
282 __u16 unused;
283 };
284
285 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */
286 struct ext4_new_group_data {
287 __u32 group;
288 __u64 block_bitmap;
289 __u64 inode_bitmap;
290 __u64 inode_table;
291 __u32 blocks_count;
292 __u16 reserved_blocks;
293 __u16 unused;
294 __u32 free_blocks_count;
295 };
296
297 /*
298 * Following is used by preallocation code to tell get_blocks() that we
299 * want uninitialzed extents.
300 */
301 #define EXT4_CREATE_UNINITIALIZED_EXT 2
302
303 /*
304 * ioctl commands
305 */
306 #define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS
307 #define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS
308 #define EXT4_IOC_GETVERSION _IOR('f', 3, long)
309 #define EXT4_IOC_SETVERSION _IOW('f', 4, long)
310 #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION
311 #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION
312 #ifdef CONFIG_JBD2_DEBUG
313 #define EXT4_IOC_WAIT_FOR_READONLY _IOR('f', 99, long)
314 #endif
315 #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long)
316 #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long)
317 #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long)
318 #define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input)
319 #define EXT4_IOC_MIGRATE _IO('f', 9)
320 /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */
321 /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */
322 #define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12)
323
324 /*
325 * ioctl commands in 32 bit emulation
326 */
327 #define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS
328 #define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS
329 #define EXT4_IOC32_GETVERSION _IOR('f', 3, int)
330 #define EXT4_IOC32_SETVERSION _IOW('f', 4, int)
331 #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int)
332 #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int)
333 #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int)
334 #ifdef CONFIG_JBD2_DEBUG
335 #define EXT4_IOC32_WAIT_FOR_READONLY _IOR('f', 99, int)
336 #endif
337 #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION
338 #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION
339
340
341 /*
342 * Mount options
343 */
344 struct ext4_mount_options {
345 unsigned long s_mount_opt;
346 uid_t s_resuid;
347 gid_t s_resgid;
348 unsigned long s_commit_interval;
349 u32 s_min_batch_time, s_max_batch_time;
350 #ifdef CONFIG_QUOTA
351 int s_jquota_fmt;
352 char *s_qf_names[MAXQUOTAS];
353 #endif
354 };
355
356 /*
357 * Structure of an inode on the disk
358 */
359 struct ext4_inode {
360 __le16 i_mode; /* File mode */
361 __le16 i_uid; /* Low 16 bits of Owner Uid */
362 __le32 i_size_lo; /* Size in bytes */
363 __le32 i_atime; /* Access time */
364 __le32 i_ctime; /* Inode Change time */
365 __le32 i_mtime; /* Modification time */
366 __le32 i_dtime; /* Deletion Time */
367 __le16 i_gid; /* Low 16 bits of Group Id */
368 __le16 i_links_count; /* Links count */
369 __le32 i_blocks_lo; /* Blocks count */
370 __le32 i_flags; /* File flags */
371 union {
372 struct {
373 __le32 l_i_version;
374 } linux1;
375 struct {
376 __u32 h_i_translator;
377 } hurd1;
378 struct {
379 __u32 m_i_reserved1;
380 } masix1;
381 } osd1; /* OS dependent 1 */
382 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
383 __le32 i_generation; /* File version (for NFS) */
384 __le32 i_file_acl_lo; /* File ACL */
385 __le32 i_size_high;
386 __le32 i_obso_faddr; /* Obsoleted fragment address */
387 union {
388 struct {
389 __le16 l_i_blocks_high; /* were l_i_reserved1 */
390 __le16 l_i_file_acl_high;
391 __le16 l_i_uid_high; /* these 2 fields */
392 __le16 l_i_gid_high; /* were reserved2[0] */
393 __u32 l_i_reserved2;
394 } linux2;
395 struct {
396 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
397 __u16 h_i_mode_high;
398 __u16 h_i_uid_high;
399 __u16 h_i_gid_high;
400 __u32 h_i_author;
401 } hurd2;
402 struct {
403 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
404 __le16 m_i_file_acl_high;
405 __u32 m_i_reserved2[2];
406 } masix2;
407 } osd2; /* OS dependent 2 */
408 __le16 i_extra_isize;
409 __le16 i_pad1;
410 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */
411 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */
412 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */
413 __le32 i_crtime; /* File Creation time */
414 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */
415 __le32 i_version_hi; /* high 32 bits for 64-bit version */
416 };
417
418
419 #define EXT4_EPOCH_BITS 2
420 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
421 #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS)
422
423 /*
424 * Extended fields will fit into an inode if the filesystem was formatted
425 * with large inodes (-I 256 or larger) and there are not currently any EAs
426 * consuming all of the available space. For new inodes we always reserve
427 * enough space for the kernel's known extended fields, but for inodes
428 * created with an old kernel this might not have been the case. None of
429 * the extended inode fields is critical for correct filesystem operation.
430 * This macro checks if a certain field fits in the inode. Note that
431 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
432 */
433 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \
434 ((offsetof(typeof(*ext4_inode), field) + \
435 sizeof((ext4_inode)->field)) \
436 <= (EXT4_GOOD_OLD_INODE_SIZE + \
437 (einode)->i_extra_isize)) \
438
439 static inline __le32 ext4_encode_extra_time(struct timespec *time)
440 {
441 return cpu_to_le32((sizeof(time->tv_sec) > 4 ?
442 time->tv_sec >> 32 : 0) |
443 ((time->tv_nsec << 2) & EXT4_NSEC_MASK));
444 }
445
446 static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra)
447 {
448 if (sizeof(time->tv_sec) > 4)
449 time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK)
450 << 32;
451 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> 2;
452 }
453
454 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \
455 do { \
456 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \
457 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
458 (raw_inode)->xtime ## _extra = \
459 ext4_encode_extra_time(&(inode)->xtime); \
460 } while (0)
461
462 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \
463 do { \
464 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
465 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \
466 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
467 (raw_inode)->xtime ## _extra = \
468 ext4_encode_extra_time(&(einode)->xtime); \
469 } while (0)
470
471 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \
472 do { \
473 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \
474 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
475 ext4_decode_extra_time(&(inode)->xtime, \
476 raw_inode->xtime ## _extra); \
477 } while (0)
478
479 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \
480 do { \
481 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
482 (einode)->xtime.tv_sec = \
483 (signed)le32_to_cpu((raw_inode)->xtime); \
484 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
485 ext4_decode_extra_time(&(einode)->xtime, \
486 raw_inode->xtime ## _extra); \
487 } while (0)
488
489 #define i_disk_version osd1.linux1.l_i_version
490
491 #if defined(__KERNEL__) || defined(__linux__)
492 #define i_reserved1 osd1.linux1.l_i_reserved1
493 #define i_file_acl_high osd2.linux2.l_i_file_acl_high
494 #define i_blocks_high osd2.linux2.l_i_blocks_high
495 #define i_uid_low i_uid
496 #define i_gid_low i_gid
497 #define i_uid_high osd2.linux2.l_i_uid_high
498 #define i_gid_high osd2.linux2.l_i_gid_high
499 #define i_reserved2 osd2.linux2.l_i_reserved2
500
501 #elif defined(__GNU__)
502
503 #define i_translator osd1.hurd1.h_i_translator
504 #define i_uid_high osd2.hurd2.h_i_uid_high
505 #define i_gid_high osd2.hurd2.h_i_gid_high
506 #define i_author osd2.hurd2.h_i_author
507
508 #elif defined(__masix__)
509
510 #define i_reserved1 osd1.masix1.m_i_reserved1
511 #define i_file_acl_high osd2.masix2.m_i_file_acl_high
512 #define i_reserved2 osd2.masix2.m_i_reserved2
513
514 #endif /* defined(__KERNEL__) || defined(__linux__) */
515
516 /*
517 * File system states
518 */
519 #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */
520 #define EXT4_ERROR_FS 0x0002 /* Errors detected */
521 #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */
522
523 /*
524 * Misc. filesystem flags
525 */
526 #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */
527 #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */
528 #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */
529
530 /*
531 * Mount flags
532 */
533 #define EXT4_MOUNT_OLDALLOC 0x00002 /* Don't use the new Orlov allocator */
534 #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */
535 #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */
536 #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */
537 #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */
538 #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */
539 #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */
540 #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/
541 #define EXT4_MOUNT_ABORT 0x00200 /* Fatal error detected */
542 #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */
543 #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */
544 #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */
545 #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */
546 #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */
547 #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */
548 #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */
549 #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */
550 #define EXT4_MOUNT_RESERVATION 0x10000 /* Preallocation */
551 #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */
552 #define EXT4_MOUNT_NOBH 0x40000 /* No bufferheads */
553 #define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */
554 #define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */
555 #define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */
556 #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */
557 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */
558 #define EXT4_MOUNT_I_VERSION 0x2000000 /* i_version support */
559 #define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */
560 #define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */
561
562 /* Compatibility, for having both ext2_fs.h and ext4_fs.h included at once */
563 #ifndef _LINUX_EXT2_FS_H
564 #define clear_opt(o, opt) o &= ~EXT4_MOUNT_##opt
565 #define set_opt(o, opt) o |= EXT4_MOUNT_##opt
566 #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \
567 EXT4_MOUNT_##opt)
568 #else
569 #define EXT2_MOUNT_NOLOAD EXT4_MOUNT_NOLOAD
570 #define EXT2_MOUNT_ABORT EXT4_MOUNT_ABORT
571 #define EXT2_MOUNT_DATA_FLAGS EXT4_MOUNT_DATA_FLAGS
572 #endif
573
574 #define ext4_set_bit ext2_set_bit
575 #define ext4_set_bit_atomic ext2_set_bit_atomic
576 #define ext4_clear_bit ext2_clear_bit
577 #define ext4_clear_bit_atomic ext2_clear_bit_atomic
578 #define ext4_test_bit ext2_test_bit
579 #define ext4_find_first_zero_bit ext2_find_first_zero_bit
580 #define ext4_find_next_zero_bit ext2_find_next_zero_bit
581 #define ext4_find_next_bit ext2_find_next_bit
582
583 /*
584 * Maximal mount counts between two filesystem checks
585 */
586 #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
587 #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */
588
589 /*
590 * Behaviour when detecting errors
591 */
592 #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */
593 #define EXT4_ERRORS_RO 2 /* Remount fs read-only */
594 #define EXT4_ERRORS_PANIC 3 /* Panic */
595 #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE
596
597 /*
598 * Structure of the super block
599 */
600 struct ext4_super_block {
601 /*00*/ __le32 s_inodes_count; /* Inodes count */
602 __le32 s_blocks_count_lo; /* Blocks count */
603 __le32 s_r_blocks_count_lo; /* Reserved blocks count */
604 __le32 s_free_blocks_count_lo; /* Free blocks count */
605 /*10*/ __le32 s_free_inodes_count; /* Free inodes count */
606 __le32 s_first_data_block; /* First Data Block */
607 __le32 s_log_block_size; /* Block size */
608 __le32 s_obso_log_frag_size; /* Obsoleted fragment size */
609 /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */
610 __le32 s_obso_frags_per_group; /* Obsoleted fragments per group */
611 __le32 s_inodes_per_group; /* # Inodes per group */
612 __le32 s_mtime; /* Mount time */
613 /*30*/ __le32 s_wtime; /* Write time */
614 __le16 s_mnt_count; /* Mount count */
615 __le16 s_max_mnt_count; /* Maximal mount count */
616 __le16 s_magic; /* Magic signature */
617 __le16 s_state; /* File system state */
618 __le16 s_errors; /* Behaviour when detecting errors */
619 __le16 s_minor_rev_level; /* minor revision level */
620 /*40*/ __le32 s_lastcheck; /* time of last check */
621 __le32 s_checkinterval; /* max. time between checks */
622 __le32 s_creator_os; /* OS */
623 __le32 s_rev_level; /* Revision level */
624 /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */
625 __le16 s_def_resgid; /* Default gid for reserved blocks */
626 /*
627 * These fields are for EXT4_DYNAMIC_REV superblocks only.
628 *
629 * Note: the difference between the compatible feature set and
630 * the incompatible feature set is that if there is a bit set
631 * in the incompatible feature set that the kernel doesn't
632 * know about, it should refuse to mount the filesystem.
633 *
634 * e2fsck's requirements are more strict; if it doesn't know
635 * about a feature in either the compatible or incompatible
636 * feature set, it must abort and not try to meddle with
637 * things it doesn't understand...
638 */
639 __le32 s_first_ino; /* First non-reserved inode */
640 __le16 s_inode_size; /* size of inode structure */
641 __le16 s_block_group_nr; /* block group # of this superblock */
642 __le32 s_feature_compat; /* compatible feature set */
643 /*60*/ __le32 s_feature_incompat; /* incompatible feature set */
644 __le32 s_feature_ro_compat; /* readonly-compatible feature set */
645 /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */
646 /*78*/ char s_volume_name[16]; /* volume name */
647 /*88*/ char s_last_mounted[64]; /* directory where last mounted */
648 /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */
649 /*
650 * Performance hints. Directory preallocation should only
651 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
652 */
653 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/
654 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */
655 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */
656 /*
657 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
658 */
659 /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */
660 /*E0*/ __le32 s_journal_inum; /* inode number of journal file */
661 __le32 s_journal_dev; /* device number of journal file */
662 __le32 s_last_orphan; /* start of list of inodes to delete */
663 __le32 s_hash_seed[4]; /* HTREE hash seed */
664 __u8 s_def_hash_version; /* Default hash version to use */
665 __u8 s_reserved_char_pad;
666 __le16 s_desc_size; /* size of group descriptor */
667 /*100*/ __le32 s_default_mount_opts;
668 __le32 s_first_meta_bg; /* First metablock block group */
669 __le32 s_mkfs_time; /* When the filesystem was created */
670 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */
671 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
672 /*150*/ __le32 s_blocks_count_hi; /* Blocks count */
673 __le32 s_r_blocks_count_hi; /* Reserved blocks count */
674 __le32 s_free_blocks_count_hi; /* Free blocks count */
675 __le16 s_min_extra_isize; /* All inodes have at least # bytes */
676 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */
677 __le32 s_flags; /* Miscellaneous flags */
678 __le16 s_raid_stride; /* RAID stride */
679 __le16 s_mmp_interval; /* # seconds to wait in MMP checking */
680 __le64 s_mmp_block; /* Block for multi-mount protection */
681 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/
682 __u8 s_log_groups_per_flex; /* FLEX_BG group size */
683 __u8 s_reserved_char_pad2;
684 __le16 s_reserved_pad;
685 __u32 s_reserved[162]; /* Padding to the end of the block */
686 };
687
688 #ifdef __KERNEL__
689 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb)
690 {
691 return sb->s_fs_info;
692 }
693 static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
694 {
695 return container_of(inode, struct ext4_inode_info, vfs_inode);
696 }
697
698 static inline struct timespec ext4_current_time(struct inode *inode)
699 {
700 return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ?
701 current_fs_time(inode->i_sb) : CURRENT_TIME_SEC;
702 }
703
704
705 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
706 {
707 return ino == EXT4_ROOT_INO ||
708 ino == EXT4_JOURNAL_INO ||
709 ino == EXT4_RESIZE_INO ||
710 (ino >= EXT4_FIRST_INO(sb) &&
711 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
712 }
713 #else
714 /* Assume that user mode programs are passing in an ext4fs superblock, not
715 * a kernel struct super_block. This will allow us to call the feature-test
716 * macros from user land. */
717 #define EXT4_SB(sb) (sb)
718 #endif
719
720 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
721
722 /*
723 * Codes for operating systems
724 */
725 #define EXT4_OS_LINUX 0
726 #define EXT4_OS_HURD 1
727 #define EXT4_OS_MASIX 2
728 #define EXT4_OS_FREEBSD 3
729 #define EXT4_OS_LITES 4
730
731 /*
732 * Revision levels
733 */
734 #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */
735 #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
736
737 #define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV
738 #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV
739
740 #define EXT4_GOOD_OLD_INODE_SIZE 128
741
742 /*
743 * Feature set definitions
744 */
745
746 #define EXT4_HAS_COMPAT_FEATURE(sb,mask) \
747 ((EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask)) != 0)
748 #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \
749 ((EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask)) != 0)
750 #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \
751 ((EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask)) != 0)
752 #define EXT4_SET_COMPAT_FEATURE(sb,mask) \
753 EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
754 #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \
755 EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
756 #define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \
757 EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
758 #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \
759 EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
760 #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \
761 EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
762 #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \
763 EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
764
765 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001
766 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002
767 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004
768 #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008
769 #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010
770 #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020
771
772 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
773 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
774 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
775 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008
776 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010
777 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020
778 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040
779
780 #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001
781 #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002
782 #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */
783 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */
784 #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010
785 #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */
786 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080
787 #define EXT4_FEATURE_INCOMPAT_MMP 0x0100
788 #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200
789
790 #define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR
791 #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
792 EXT4_FEATURE_INCOMPAT_RECOVER| \
793 EXT4_FEATURE_INCOMPAT_META_BG| \
794 EXT4_FEATURE_INCOMPAT_EXTENTS| \
795 EXT4_FEATURE_INCOMPAT_64BIT| \
796 EXT4_FEATURE_INCOMPAT_FLEX_BG)
797 #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
798 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
799 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
800 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
801 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
802 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
803 EXT4_FEATURE_RO_COMPAT_HUGE_FILE)
804
805 /*
806 * Default values for user and/or group using reserved blocks
807 */
808 #define EXT4_DEF_RESUID 0
809 #define EXT4_DEF_RESGID 0
810
811 #define EXT4_DEF_INODE_READAHEAD_BLKS 32
812
813 /*
814 * Default mount options
815 */
816 #define EXT4_DEFM_DEBUG 0x0001
817 #define EXT4_DEFM_BSDGROUPS 0x0002
818 #define EXT4_DEFM_XATTR_USER 0x0004
819 #define EXT4_DEFM_ACL 0x0008
820 #define EXT4_DEFM_UID16 0x0010
821 #define EXT4_DEFM_JMODE 0x0060
822 #define EXT4_DEFM_JMODE_DATA 0x0020
823 #define EXT4_DEFM_JMODE_ORDERED 0x0040
824 #define EXT4_DEFM_JMODE_WBACK 0x0060
825
826 /*
827 * Default journal batch times
828 */
829 #define EXT4_DEF_MIN_BATCH_TIME 0
830 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */
831
832 /*
833 * Minimum number of groups in a flexgroup before we separate out
834 * directories into the first block group of a flexgroup
835 */
836 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4
837
838 /*
839 * Structure of a directory entry
840 */
841 #define EXT4_NAME_LEN 255
842
843 struct ext4_dir_entry {
844 __le32 inode; /* Inode number */
845 __le16 rec_len; /* Directory entry length */
846 __le16 name_len; /* Name length */
847 char name[EXT4_NAME_LEN]; /* File name */
848 };
849
850 /*
851 * The new version of the directory entry. Since EXT4 structures are
852 * stored in intel byte order, and the name_len field could never be
853 * bigger than 255 chars, it's safe to reclaim the extra byte for the
854 * file_type field.
855 */
856 struct ext4_dir_entry_2 {
857 __le32 inode; /* Inode number */
858 __le16 rec_len; /* Directory entry length */
859 __u8 name_len; /* Name length */
860 __u8 file_type;
861 char name[EXT4_NAME_LEN]; /* File name */
862 };
863
864 /*
865 * Ext4 directory file types. Only the low 3 bits are used. The
866 * other bits are reserved for now.
867 */
868 #define EXT4_FT_UNKNOWN 0
869 #define EXT4_FT_REG_FILE 1
870 #define EXT4_FT_DIR 2
871 #define EXT4_FT_CHRDEV 3
872 #define EXT4_FT_BLKDEV 4
873 #define EXT4_FT_FIFO 5
874 #define EXT4_FT_SOCK 6
875 #define EXT4_FT_SYMLINK 7
876
877 #define EXT4_FT_MAX 8
878
879 /*
880 * EXT4_DIR_PAD defines the directory entries boundaries
881 *
882 * NOTE: It must be a multiple of 4
883 */
884 #define EXT4_DIR_PAD 4
885 #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1)
886 #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \
887 ~EXT4_DIR_ROUND)
888 #define EXT4_MAX_REC_LEN ((1<<16)-1)
889
890 /*
891 * Hash Tree Directory indexing
892 * (c) Daniel Phillips, 2001
893 */
894
895 #define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \
896 EXT4_FEATURE_COMPAT_DIR_INDEX) && \
897 (EXT4_I(dir)->i_flags & EXT4_INDEX_FL))
898 #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX)
899 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
900
901 /* Legal values for the dx_root hash_version field: */
902
903 #define DX_HASH_LEGACY 0
904 #define DX_HASH_HALF_MD4 1
905 #define DX_HASH_TEA 2
906 #define DX_HASH_LEGACY_UNSIGNED 3
907 #define DX_HASH_HALF_MD4_UNSIGNED 4
908 #define DX_HASH_TEA_UNSIGNED 5
909
910 #ifdef __KERNEL__
911
912 /* hash info structure used by the directory hash */
913 struct dx_hash_info
914 {
915 u32 hash;
916 u32 minor_hash;
917 int hash_version;
918 u32 *seed;
919 };
920
921 #define EXT4_HTREE_EOF 0x7fffffff
922
923 /*
924 * Control parameters used by ext4_htree_next_block
925 */
926 #define HASH_NB_ALWAYS 1
927
928
929 /*
930 * Describe an inode's exact location on disk and in memory
931 */
932 struct ext4_iloc
933 {
934 struct buffer_head *bh;
935 unsigned long offset;
936 ext4_group_t block_group;
937 };
938
939 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
940 {
941 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
942 }
943
944 /*
945 * This structure is stuffed into the struct file's private_data field
946 * for directories. It is where we put information so that we can do
947 * readdir operations in hash tree order.
948 */
949 struct dir_private_info {
950 struct rb_root root;
951 struct rb_node *curr_node;
952 struct fname *extra_fname;
953 loff_t last_pos;
954 __u32 curr_hash;
955 __u32 curr_minor_hash;
956 __u32 next_hash;
957 };
958
959 /* calculate the first block number of the group */
960 static inline ext4_fsblk_t
961 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no)
962 {
963 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
964 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
965 }
966
967 /*
968 * Special error return code only used by dx_probe() and its callers.
969 */
970 #define ERR_BAD_DX_DIR -75000
971
972 void ext4_get_group_no_and_offset(struct super_block *sb, ext4_fsblk_t blocknr,
973 ext4_group_t *blockgrpp, ext4_grpblk_t *offsetp);
974
975 extern struct proc_dir_entry *ext4_proc_root;
976
977 #ifdef CONFIG_PROC_FS
978 extern const struct file_operations ext4_ui_proc_fops;
979
980 #define EXT4_PROC_HANDLER(name, var) \
981 do { \
982 proc = proc_create_data(name, mode, sbi->s_proc, \
983 &ext4_ui_proc_fops, &sbi->s_##var); \
984 if (proc == NULL) { \
985 printk(KERN_ERR "EXT4-fs: can't create %s\n", name); \
986 goto err_out; \
987 } \
988 } while (0)
989 #else
990 #define EXT4_PROC_HANDLER(name, var)
991 #endif
992
993 /*
994 * Function prototypes
995 */
996
997 /*
998 * Ok, these declarations are also in <linux/kernel.h> but none of the
999 * ext4 source programs needs to include it so they are duplicated here.
1000 */
1001 # define NORET_TYPE /**/
1002 # define ATTRIB_NORET __attribute__((noreturn))
1003 # define NORET_AND noreturn,
1004
1005 /* bitmap.c */
1006 extern unsigned int ext4_count_free(struct buffer_head *, unsigned);
1007
1008 /* balloc.c */
1009 extern unsigned int ext4_block_group(struct super_block *sb,
1010 ext4_fsblk_t blocknr);
1011 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb,
1012 ext4_fsblk_t blocknr);
1013 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group);
1014 extern unsigned long ext4_bg_num_gdb(struct super_block *sb,
1015 ext4_group_t group);
1016 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,
1017 ext4_fsblk_t goal, unsigned long *count, int *errp);
1018 extern int ext4_claim_free_blocks(struct ext4_sb_info *sbi, s64 nblocks);
1019 extern int ext4_has_free_blocks(struct ext4_sb_info *sbi, s64 nblocks);
1020 extern void ext4_free_blocks(handle_t *handle, struct inode *inode,
1021 ext4_fsblk_t block, unsigned long count, int metadata);
1022 extern void ext4_add_groupblocks(handle_t *handle, struct super_block *sb,
1023 ext4_fsblk_t block, unsigned long count);
1024 extern ext4_fsblk_t ext4_count_free_blocks(struct super_block *);
1025 extern void ext4_check_blocks_bitmap(struct super_block *);
1026 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
1027 ext4_group_t block_group,
1028 struct buffer_head ** bh);
1029 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
1030
1031 /* dir.c */
1032 extern int ext4_check_dir_entry(const char *, struct inode *,
1033 struct ext4_dir_entry_2 *,
1034 struct buffer_head *, unsigned int);
1035 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
1036 __u32 minor_hash,
1037 struct ext4_dir_entry_2 *dirent);
1038 extern void ext4_htree_free_dir_info(struct dir_private_info *p);
1039
1040 /* fsync.c */
1041 extern int ext4_sync_file(struct file *, struct dentry *, int);
1042
1043 /* hash.c */
1044 extern int ext4fs_dirhash(const char *name, int len, struct
1045 dx_hash_info *hinfo);
1046
1047 /* ialloc.c */
1048 extern struct inode * ext4_new_inode(handle_t *, struct inode *, int);
1049 extern void ext4_free_inode(handle_t *, struct inode *);
1050 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long);
1051 extern unsigned long ext4_count_free_inodes(struct super_block *);
1052 extern unsigned long ext4_count_dirs(struct super_block *);
1053 extern void ext4_check_inodes_bitmap(struct super_block *);
1054
1055 /* mballoc.c */
1056 extern long ext4_mb_stats;
1057 extern long ext4_mb_max_to_scan;
1058 extern int ext4_mb_init(struct super_block *, int);
1059 extern int ext4_mb_release(struct super_block *);
1060 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *,
1061 struct ext4_allocation_request *, int *);
1062 extern int ext4_mb_reserve_blocks(struct super_block *, int);
1063 extern void ext4_discard_preallocations(struct inode *);
1064 extern int __init init_ext4_mballoc(void);
1065 extern void exit_ext4_mballoc(void);
1066 extern void ext4_mb_free_blocks(handle_t *, struct inode *,
1067 unsigned long, unsigned long, int, unsigned long *);
1068 extern int ext4_mb_add_groupinfo(struct super_block *sb,
1069 ext4_group_t i, struct ext4_group_desc *desc);
1070 extern void ext4_mb_update_group_info(struct ext4_group_info *grp,
1071 ext4_grpblk_t add);
1072 extern int ext4_mb_get_buddy_cache_lock(struct super_block *, ext4_group_t);
1073 extern void ext4_mb_put_buddy_cache_lock(struct super_block *,
1074 ext4_group_t, int);
1075 /* inode.c */
1076 int ext4_forget(handle_t *handle, int is_metadata, struct inode *inode,
1077 struct buffer_head *bh, ext4_fsblk_t blocknr);
1078 struct buffer_head *ext4_getblk(handle_t *, struct inode *,
1079 ext4_lblk_t, int, int *);
1080 struct buffer_head *ext4_bread(handle_t *, struct inode *,
1081 ext4_lblk_t, int, int *);
1082 int ext4_get_block(struct inode *inode, sector_t iblock,
1083 struct buffer_head *bh_result, int create);
1084
1085 extern struct inode *ext4_iget(struct super_block *, unsigned long);
1086 extern int ext4_write_inode(struct inode *, int);
1087 extern int ext4_setattr(struct dentry *, struct iattr *);
1088 extern int ext4_getattr(struct vfsmount *mnt, struct dentry *dentry,
1089 struct kstat *stat);
1090 extern void ext4_delete_inode(struct inode *);
1091 extern int ext4_sync_inode(handle_t *, struct inode *);
1092 extern void ext4_dirty_inode(struct inode *);
1093 extern int ext4_change_inode_journal_flag(struct inode *, int);
1094 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
1095 extern int ext4_can_truncate(struct inode *inode);
1096 extern void ext4_truncate(struct inode *);
1097 extern void ext4_set_inode_flags(struct inode *);
1098 extern void ext4_get_inode_flags(struct ext4_inode_info *);
1099 extern int ext4_alloc_da_blocks(struct inode *inode);
1100 extern void ext4_set_aops(struct inode *inode);
1101 extern int ext4_writepage_trans_blocks(struct inode *);
1102 extern int ext4_meta_trans_blocks(struct inode *, int nrblocks, int idxblocks);
1103 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks);
1104 extern int ext4_block_truncate_page(handle_t *handle,
1105 struct address_space *mapping, loff_t from);
1106 extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct page *page);
1107 extern qsize_t ext4_get_reserved_space(struct inode *inode);
1108
1109 /* ioctl.c */
1110 extern long ext4_ioctl(struct file *, unsigned int, unsigned long);
1111 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long);
1112
1113 /* migrate.c */
1114 extern int ext4_ext_migrate(struct inode *);
1115
1116 /* namei.c */
1117 extern unsigned int ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize);
1118 extern __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize);
1119 extern int ext4_orphan_add(handle_t *, struct inode *);
1120 extern int ext4_orphan_del(handle_t *, struct inode *);
1121 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
1122 __u32 start_minor_hash, __u32 *next_hash);
1123
1124 /* resize.c */
1125 extern int ext4_group_add(struct super_block *sb,
1126 struct ext4_new_group_data *input);
1127 extern int ext4_group_extend(struct super_block *sb,
1128 struct ext4_super_block *es,
1129 ext4_fsblk_t n_blocks_count);
1130
1131 /* super.c */
1132 extern void ext4_error(struct super_block *, const char *, const char *, ...)
1133 __attribute__ ((format (printf, 3, 4)));
1134 extern void __ext4_std_error(struct super_block *, const char *, int);
1135 extern void ext4_abort(struct super_block *, const char *, const char *, ...)
1136 __attribute__ ((format (printf, 3, 4)));
1137 extern void ext4_warning(struct super_block *, const char *, const char *, ...)
1138 __attribute__ ((format (printf, 3, 4)));
1139 extern void ext4_grp_locked_error(struct super_block *, ext4_group_t,
1140 const char *, const char *, ...)
1141 __attribute__ ((format (printf, 4, 5)));
1142 extern void ext4_update_dynamic_rev(struct super_block *sb);
1143 extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb,
1144 __u32 compat);
1145 extern int ext4_update_rocompat_feature(handle_t *handle,
1146 struct super_block *sb, __u32 rocompat);
1147 extern int ext4_update_incompat_feature(handle_t *handle,
1148 struct super_block *sb, __u32 incompat);
1149 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
1150 struct ext4_group_desc *bg);
1151 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
1152 struct ext4_group_desc *bg);
1153 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
1154 struct ext4_group_desc *bg);
1155 extern __u32 ext4_free_blks_count(struct super_block *sb,
1156 struct ext4_group_desc *bg);
1157 extern __u32 ext4_free_inodes_count(struct super_block *sb,
1158 struct ext4_group_desc *bg);
1159 extern __u32 ext4_used_dirs_count(struct super_block *sb,
1160 struct ext4_group_desc *bg);
1161 extern __u32 ext4_itable_unused_count(struct super_block *sb,
1162 struct ext4_group_desc *bg);
1163 extern void ext4_block_bitmap_set(struct super_block *sb,
1164 struct ext4_group_desc *bg, ext4_fsblk_t blk);
1165 extern void ext4_inode_bitmap_set(struct super_block *sb,
1166 struct ext4_group_desc *bg, ext4_fsblk_t blk);
1167 extern void ext4_inode_table_set(struct super_block *sb,
1168 struct ext4_group_desc *bg, ext4_fsblk_t blk);
1169 extern void ext4_free_blks_set(struct super_block *sb,
1170 struct ext4_group_desc *bg, __u32 count);
1171 extern void ext4_free_inodes_set(struct super_block *sb,
1172 struct ext4_group_desc *bg, __u32 count);
1173 extern void ext4_used_dirs_set(struct super_block *sb,
1174 struct ext4_group_desc *bg, __u32 count);
1175 extern void ext4_itable_unused_set(struct super_block *sb,
1176 struct ext4_group_desc *bg, __u32 count);
1177
1178 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
1179 {
1180 return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) |
1181 le32_to_cpu(es->s_blocks_count_lo);
1182 }
1183
1184 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
1185 {
1186 return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) |
1187 le32_to_cpu(es->s_r_blocks_count_lo);
1188 }
1189
1190 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
1191 {
1192 return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) |
1193 le32_to_cpu(es->s_free_blocks_count_lo);
1194 }
1195
1196 static inline void ext4_blocks_count_set(struct ext4_super_block *es,
1197 ext4_fsblk_t blk)
1198 {
1199 es->s_blocks_count_lo = cpu_to_le32((u32)blk);
1200 es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
1201 }
1202
1203 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
1204 ext4_fsblk_t blk)
1205 {
1206 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk);
1207 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
1208 }
1209
1210 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
1211 ext4_fsblk_t blk)
1212 {
1213 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk);
1214 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
1215 }
1216
1217 static inline loff_t ext4_isize(struct ext4_inode *raw_inode)
1218 {
1219 if (S_ISREG(le16_to_cpu(raw_inode->i_mode)))
1220 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) |
1221 le32_to_cpu(raw_inode->i_size_lo);
1222 else
1223 return (loff_t) le32_to_cpu(raw_inode->i_size_lo);
1224 }
1225
1226 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size)
1227 {
1228 raw_inode->i_size_lo = cpu_to_le32(i_size);
1229 raw_inode->i_size_high = cpu_to_le32(i_size >> 32);
1230 }
1231
1232 static inline
1233 struct ext4_group_info *ext4_get_group_info(struct super_block *sb,
1234 ext4_group_t group)
1235 {
1236 struct ext4_group_info ***grp_info;
1237 long indexv, indexh;
1238 grp_info = EXT4_SB(sb)->s_group_info;
1239 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb));
1240 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1);
1241 return grp_info[indexv][indexh];
1242 }
1243
1244
1245 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi,
1246 ext4_group_t block_group)
1247 {
1248 return block_group >> sbi->s_log_groups_per_flex;
1249 }
1250
1251 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi)
1252 {
1253 return 1 << sbi->s_log_groups_per_flex;
1254 }
1255
1256 #define ext4_std_error(sb, errno) \
1257 do { \
1258 if ((errno)) \
1259 __ext4_std_error((sb), __func__, (errno)); \
1260 } while (0)
1261
1262 #ifdef CONFIG_SMP
1263 /* Each CPU can accumulate percpu_counter_batch blocks in their local
1264 * counters. So we need to make sure we have free blocks more
1265 * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times.
1266 */
1267 #define EXT4_FREEBLOCKS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids))
1268 #else
1269 #define EXT4_FREEBLOCKS_WATERMARK 0
1270 #endif
1271
1272 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize)
1273 {
1274 /*
1275 * XXX: replace with spinlock if seen contended -bzzz
1276 */
1277 down_write(&EXT4_I(inode)->i_data_sem);
1278 if (newsize > EXT4_I(inode)->i_disksize)
1279 EXT4_I(inode)->i_disksize = newsize;
1280 up_write(&EXT4_I(inode)->i_data_sem);
1281 return ;
1282 }
1283
1284 struct ext4_group_info {
1285 unsigned long bb_state;
1286 struct rb_root bb_free_root;
1287 unsigned short bb_first_free;
1288 unsigned short bb_free;
1289 unsigned short bb_fragments;
1290 struct list_head bb_prealloc_list;
1291 #ifdef DOUBLE_CHECK
1292 void *bb_bitmap;
1293 #endif
1294 struct rw_semaphore alloc_sem;
1295 unsigned short bb_counters[];
1296 };
1297
1298 #define EXT4_GROUP_INFO_NEED_INIT_BIT 0
1299 #define EXT4_GROUP_INFO_LOCKED_BIT 1
1300
1301 #define EXT4_MB_GRP_NEED_INIT(grp) \
1302 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state)))
1303
1304 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group)
1305 {
1306 struct ext4_group_info *grinfo = ext4_get_group_info(sb, group);
1307
1308 bit_spin_lock(EXT4_GROUP_INFO_LOCKED_BIT, &(grinfo->bb_state));
1309 }
1310
1311 static inline void ext4_unlock_group(struct super_block *sb,
1312 ext4_group_t group)
1313 {
1314 struct ext4_group_info *grinfo = ext4_get_group_info(sb, group);
1315
1316 bit_spin_unlock(EXT4_GROUP_INFO_LOCKED_BIT, &(grinfo->bb_state));
1317 }
1318
1319 static inline int ext4_is_group_locked(struct super_block *sb,
1320 ext4_group_t group)
1321 {
1322 struct ext4_group_info *grinfo = ext4_get_group_info(sb, group);
1323
1324 return bit_spin_is_locked(EXT4_GROUP_INFO_LOCKED_BIT,
1325 &(grinfo->bb_state));
1326 }
1327
1328 /*
1329 * Inodes and files operations
1330 */
1331
1332 /* dir.c */
1333 extern const struct file_operations ext4_dir_operations;
1334
1335 /* file.c */
1336 extern const struct inode_operations ext4_file_inode_operations;
1337 extern const struct file_operations ext4_file_operations;
1338
1339 /* namei.c */
1340 extern const struct inode_operations ext4_dir_inode_operations;
1341 extern const struct inode_operations ext4_special_inode_operations;
1342
1343 /* symlink.c */
1344 extern const struct inode_operations ext4_symlink_inode_operations;
1345 extern const struct inode_operations ext4_fast_symlink_inode_operations;
1346
1347 /* extents.c */
1348 extern int ext4_ext_tree_init(handle_t *handle, struct inode *);
1349 extern int ext4_ext_writepage_trans_blocks(struct inode *, int);
1350 extern int ext4_ext_index_trans_blocks(struct inode *inode, int nrblocks,
1351 int chunk);
1352 extern int ext4_ext_get_blocks(handle_t *handle, struct inode *inode,
1353 ext4_lblk_t iblock, unsigned int max_blocks,
1354 struct buffer_head *bh_result,
1355 int create, int extend_disksize);
1356 extern void ext4_ext_truncate(struct inode *);
1357 extern void ext4_ext_init(struct super_block *);
1358 extern void ext4_ext_release(struct super_block *);
1359 extern long ext4_fallocate(struct inode *inode, int mode, loff_t offset,
1360 loff_t len);
1361 extern int ext4_get_blocks_wrap(handle_t *handle, struct inode *inode,
1362 sector_t block, unsigned int max_blocks,
1363 struct buffer_head *bh, int create,
1364 int extend_disksize, int flag);
1365 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
1366 __u64 start, __u64 len);
1367
1368 /*
1369 * Add new method to test wether block and inode bitmaps are properly
1370 * initialized. With uninit_bg reading the block from disk is not enough
1371 * to mark the bitmap uptodate. We need to also zero-out the bitmap
1372 */
1373 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart
1374
1375 static inline int bitmap_uptodate(struct buffer_head *bh)
1376 {
1377 return (buffer_uptodate(bh) &&
1378 test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state));
1379 }
1380 static inline void set_bitmap_uptodate(struct buffer_head *bh)
1381 {
1382 set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state);
1383 }
1384
1385 #endif /* __KERNEL__ */
1386
1387 #endif /* _EXT4_H */
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree