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ext4: Rename i_dir_acl to i_size_high
[linux-2.6/kvm.git] / include / linux / ext4_fs.h
bloba8f3faea8eff6b68857ff02e851f4a2f3117a584
1 /*
2 * linux/include/linux/ext4_fs.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 _LINUX_EXT4_FS_H
17 #define _LINUX_EXT4_FS_H
18
19 #include <linux/types.h>
20 #include <linux/blkdev.h>
21 #include <linux/magic.h>
22
23 /*
24 * The second extended filesystem constants/structures
25 */
26
27 /*
28 * Define EXT4FS_DEBUG to produce debug messages
29 */
30 #undef EXT4FS_DEBUG
31
32 /*
33 * Define EXT4_RESERVATION to reserve data blocks for expanding files
34 */
35 #define EXT4_DEFAULT_RESERVE_BLOCKS 8
36 /*max window size: 1024(direct blocks) + 3([t,d]indirect blocks) */
37 #define EXT4_MAX_RESERVE_BLOCKS 1027
38 #define EXT4_RESERVE_WINDOW_NOT_ALLOCATED 0
39
40 /*
41 * Debug code
42 */
43 #ifdef EXT4FS_DEBUG
44 #define ext4_debug(f, a...) \
45 do { \
46 printk (KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \
47 __FILE__, __LINE__, __FUNCTION__); \
48 printk (KERN_DEBUG f, ## a); \
49 } while (0)
50 #else
51 #define ext4_debug(f, a...) do {} while (0)
52 #endif
53
54 /*
55 * Special inodes numbers
56 */
57 #define EXT4_BAD_INO 1 /* Bad blocks inode */
58 #define EXT4_ROOT_INO 2 /* Root inode */
59 #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */
60 #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */
61 #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */
62 #define EXT4_JOURNAL_INO 8 /* Journal inode */
63
64 /* First non-reserved inode for old ext4 filesystems */
65 #define EXT4_GOOD_OLD_FIRST_INO 11
66
67 /*
68 * Maximal count of links to a file
69 */
70 #define EXT4_LINK_MAX 65000
71
72 /*
73 * Macro-instructions used to manage several block sizes
74 */
75 #define EXT4_MIN_BLOCK_SIZE 1024
76 #define EXT4_MAX_BLOCK_SIZE 65536
77 #define EXT4_MIN_BLOCK_LOG_SIZE 10
78 #ifdef __KERNEL__
79 # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize)
80 #else
81 # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
82 #endif
83 #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof (__u32))
84 #ifdef __KERNEL__
85 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits)
86 #else
87 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10)
88 #endif
89 #ifdef __KERNEL__
90 #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits)
91 #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size)
92 #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino)
93 #else
94 #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
95 EXT4_GOOD_OLD_INODE_SIZE : \
96 (s)->s_inode_size)
97 #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
98 EXT4_GOOD_OLD_FIRST_INO : \
99 (s)->s_first_ino)
100 #endif
101 #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits)))
102
103 /*
104 * Structure of a blocks group descriptor
105 */
106 struct ext4_group_desc
107 {
108 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */
109 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */
110 __le32 bg_inode_table_lo; /* Inodes table block */
111 __le16 bg_free_blocks_count; /* Free blocks count */
112 __le16 bg_free_inodes_count; /* Free inodes count */
113 __le16 bg_used_dirs_count; /* Directories count */
114 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */
115 __u32 bg_reserved[2]; /* Likely block/inode bitmap checksum */
116 __le16 bg_itable_unused; /* Unused inodes count */
117 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */
118 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */
119 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */
120 __le32 bg_inode_table_hi; /* Inodes table block MSB */
121 };
122
123 #define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */
124 #define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */
125 #define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */
126
127 #ifdef __KERNEL__
128 #include <linux/ext4_fs_i.h>
129 #include <linux/ext4_fs_sb.h>
130 #endif
131 /*
132 * Macro-instructions used to manage group descriptors
133 */
134 #define EXT4_MIN_DESC_SIZE 32
135 #define EXT4_MIN_DESC_SIZE_64BIT 64
136 #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE
137 #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size)
138 #ifdef __KERNEL__
139 # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group)
140 # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block)
141 # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group)
142 # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits)
143 #else
144 # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group)
145 # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
146 # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group)
147 #endif
148
149 /*
150 * Constants relative to the data blocks
151 */
152 #define EXT4_NDIR_BLOCKS 12
153 #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS
154 #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1)
155 #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1)
156 #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1)
157
158 /*
159 * Inode flags
160 */
161 #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */
162 #define EXT4_UNRM_FL 0x00000002 /* Undelete */
163 #define EXT4_COMPR_FL 0x00000004 /* Compress file */
164 #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */
165 #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */
166 #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */
167 #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */
168 #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */
169 /* Reserved for compression usage... */
170 #define EXT4_DIRTY_FL 0x00000100
171 #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
172 #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */
173 #define EXT4_ECOMPR_FL 0x00000800 /* Compression error */
174 /* End compression flags --- maybe not all used */
175 #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */
176 #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */
177 #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */
178 #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */
179 #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
180 #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
181 #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */
182 #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */
183
184 #define EXT4_FL_USER_VISIBLE 0x000BDFFF /* User visible flags */
185 #define EXT4_FL_USER_MODIFIABLE 0x000380FF /* User modifiable flags */
186
187 /*
188 * Inode dynamic state flags
189 */
190 #define EXT4_STATE_JDATA 0x00000001 /* journaled data exists */
191 #define EXT4_STATE_NEW 0x00000002 /* inode is newly created */
192 #define EXT4_STATE_XATTR 0x00000004 /* has in-inode xattrs */
193 #define EXT4_STATE_NO_EXPAND 0x00000008 /* No space for expansion */
194
195 /* Used to pass group descriptor data when online resize is done */
196 struct ext4_new_group_input {
197 __u32 group; /* Group number for this data */
198 __u64 block_bitmap; /* Absolute block number of block bitmap */
199 __u64 inode_bitmap; /* Absolute block number of inode bitmap */
200 __u64 inode_table; /* Absolute block number of inode table start */
201 __u32 blocks_count; /* Total number of blocks in this group */
202 __u16 reserved_blocks; /* Number of reserved blocks in this group */
203 __u16 unused;
204 };
205
206 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */
207 struct ext4_new_group_data {
208 __u32 group;
209 __u64 block_bitmap;
210 __u64 inode_bitmap;
211 __u64 inode_table;
212 __u32 blocks_count;
213 __u16 reserved_blocks;
214 __u16 unused;
215 __u32 free_blocks_count;
216 };
217
218 /*
219 * Following is used by preallocation code to tell get_blocks() that we
220 * want uninitialzed extents.
221 */
222 #define EXT4_CREATE_UNINITIALIZED_EXT 2
223
224 /*
225 * ioctl commands
226 */
227 #define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS
228 #define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS
229 #define EXT4_IOC_GETVERSION _IOR('f', 3, long)
230 #define EXT4_IOC_SETVERSION _IOW('f', 4, long)
231 #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long)
232 #define EXT4_IOC_GROUP_ADD _IOW('f', 8,struct ext4_new_group_input)
233 #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION
234 #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION
235 #ifdef CONFIG_JBD2_DEBUG
236 #define EXT4_IOC_WAIT_FOR_READONLY _IOR('f', 99, long)
237 #endif
238 #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long)
239 #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long)
240
241 /*
242 * ioctl commands in 32 bit emulation
243 */
244 #define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS
245 #define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS
246 #define EXT4_IOC32_GETVERSION _IOR('f', 3, int)
247 #define EXT4_IOC32_SETVERSION _IOW('f', 4, int)
248 #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int)
249 #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int)
250 #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int)
251 #ifdef CONFIG_JBD2_DEBUG
252 #define EXT4_IOC32_WAIT_FOR_READONLY _IOR('f', 99, int)
253 #endif
254 #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION
255 #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION
256
257
258 /*
259 * Mount options
260 */
261 struct ext4_mount_options {
262 unsigned long s_mount_opt;
263 uid_t s_resuid;
264 gid_t s_resgid;
265 unsigned long s_commit_interval;
266 #ifdef CONFIG_QUOTA
267 int s_jquota_fmt;
268 char *s_qf_names[MAXQUOTAS];
269 #endif
270 };
271
272 /*
273 * Structure of an inode on the disk
274 */
275 struct ext4_inode {
276 __le16 i_mode; /* File mode */
277 __le16 i_uid; /* Low 16 bits of Owner Uid */
278 __le32 i_size_lo; /* Size in bytes */
279 __le32 i_atime; /* Access time */
280 __le32 i_ctime; /* Inode Change time */
281 __le32 i_mtime; /* Modification time */
282 __le32 i_dtime; /* Deletion Time */
283 __le16 i_gid; /* Low 16 bits of Group Id */
284 __le16 i_links_count; /* Links count */
285 __le32 i_blocks; /* Blocks count */
286 __le32 i_flags; /* File flags */
287 union {
288 struct {
289 __u32 l_i_reserved1;
290 } linux1;
291 struct {
292 __u32 h_i_translator;
293 } hurd1;
294 struct {
295 __u32 m_i_reserved1;
296 } masix1;
297 } osd1; /* OS dependent 1 */
298 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
299 __le32 i_generation; /* File version (for NFS) */
300 __le32 i_file_acl_lo; /* File ACL */
301 __le32 i_size_high;
302 __le32 i_obso_faddr; /* Obsoleted fragment address */
303 union {
304 struct {
305 __le16 l_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
306 __le16 l_i_file_acl_high;
307 __le16 l_i_uid_high; /* these 2 fields */
308 __le16 l_i_gid_high; /* were reserved2[0] */
309 __u32 l_i_reserved2;
310 } linux2;
311 struct {
312 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
313 __u16 h_i_mode_high;
314 __u16 h_i_uid_high;
315 __u16 h_i_gid_high;
316 __u32 h_i_author;
317 } hurd2;
318 struct {
319 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
320 __le16 m_i_file_acl_high;
321 __u32 m_i_reserved2[2];
322 } masix2;
323 } osd2; /* OS dependent 2 */
324 __le16 i_extra_isize;
325 __le16 i_pad1;
326 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */
327 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */
328 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */
329 __le32 i_crtime; /* File Creation time */
330 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */
331 };
332
333
334 #define EXT4_EPOCH_BITS 2
335 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
336 #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS)
337
338 /*
339 * Extended fields will fit into an inode if the filesystem was formatted
340 * with large inodes (-I 256 or larger) and there are not currently any EAs
341 * consuming all of the available space. For new inodes we always reserve
342 * enough space for the kernel's known extended fields, but for inodes
343 * created with an old kernel this might not have been the case. None of
344 * the extended inode fields is critical for correct filesystem operation.
345 * This macro checks if a certain field fits in the inode. Note that
346 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
347 */
348 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \
349 ((offsetof(typeof(*ext4_inode), field) + \
350 sizeof((ext4_inode)->field)) \
351 <= (EXT4_GOOD_OLD_INODE_SIZE + \
352 (einode)->i_extra_isize)) \
353
354 static inline __le32 ext4_encode_extra_time(struct timespec *time)
355 {
356 return cpu_to_le32((sizeof(time->tv_sec) > 4 ?
357 time->tv_sec >> 32 : 0) |
358 ((time->tv_nsec << 2) & EXT4_NSEC_MASK));
359 }
360
361 static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra)
362 {
363 if (sizeof(time->tv_sec) > 4)
364 time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK)
365 << 32;
366 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> 2;
367 }
368
369 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \
370 do { \
371 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \
372 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
373 (raw_inode)->xtime ## _extra = \
374 ext4_encode_extra_time(&(inode)->xtime); \
375 } while (0)
376
377 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \
378 do { \
379 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
380 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \
381 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
382 (raw_inode)->xtime ## _extra = \
383 ext4_encode_extra_time(&(einode)->xtime); \
384 } while (0)
385
386 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \
387 do { \
388 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \
389 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
390 ext4_decode_extra_time(&(inode)->xtime, \
391 raw_inode->xtime ## _extra); \
392 } while (0)
393
394 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \
395 do { \
396 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
397 (einode)->xtime.tv_sec = \
398 (signed)le32_to_cpu((raw_inode)->xtime); \
399 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
400 ext4_decode_extra_time(&(einode)->xtime, \
401 raw_inode->xtime ## _extra); \
402 } while (0)
403
404 #if defined(__KERNEL__) || defined(__linux__)
405 #define i_reserved1 osd1.linux1.l_i_reserved1
406 #define i_file_acl_high osd2.linux2.l_i_file_acl_high
407 #define i_uid_low i_uid
408 #define i_gid_low i_gid
409 #define i_uid_high osd2.linux2.l_i_uid_high
410 #define i_gid_high osd2.linux2.l_i_gid_high
411 #define i_reserved2 osd2.linux2.l_i_reserved2
412
413 #elif defined(__GNU__)
414
415 #define i_translator osd1.hurd1.h_i_translator
416 #define i_uid_high osd2.hurd2.h_i_uid_high
417 #define i_gid_high osd2.hurd2.h_i_gid_high
418 #define i_author osd2.hurd2.h_i_author
419
420 #elif defined(__masix__)
421
422 #define i_reserved1 osd1.masix1.m_i_reserved1
423 #define i_file_acl_high osd2.masix2.m_i_file_acl_high
424 #define i_reserved2 osd2.masix2.m_i_reserved2
425
426 #endif /* defined(__KERNEL__) || defined(__linux__) */
427
428 /*
429 * File system states
430 */
431 #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */
432 #define EXT4_ERROR_FS 0x0002 /* Errors detected */
433 #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */
434
435 /*
436 * Mount flags
437 */
438 #define EXT4_MOUNT_CHECK 0x00001 /* Do mount-time checks */
439 #define EXT4_MOUNT_OLDALLOC 0x00002 /* Don't use the new Orlov allocator */
440 #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */
441 #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */
442 #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */
443 #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */
444 #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */
445 #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */
446 #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/
447 #define EXT4_MOUNT_ABORT 0x00200 /* Fatal error detected */
448 #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */
449 #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */
450 #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */
451 #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */
452 #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */
453 #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */
454 #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */
455 #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */
456 #define EXT4_MOUNT_RESERVATION 0x10000 /* Preallocation */
457 #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */
458 #define EXT4_MOUNT_NOBH 0x40000 /* No bufferheads */
459 #define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */
460 #define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */
461 #define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */
462 #define EXT4_MOUNT_EXTENTS 0x400000 /* Extents support */
463
464 /* Compatibility, for having both ext2_fs.h and ext4_fs.h included at once */
465 #ifndef _LINUX_EXT2_FS_H
466 #define clear_opt(o, opt) o &= ~EXT4_MOUNT_##opt
467 #define set_opt(o, opt) o |= EXT4_MOUNT_##opt
468 #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \
469 EXT4_MOUNT_##opt)
470 #else
471 #define EXT2_MOUNT_NOLOAD EXT4_MOUNT_NOLOAD
472 #define EXT2_MOUNT_ABORT EXT4_MOUNT_ABORT
473 #define EXT2_MOUNT_DATA_FLAGS EXT4_MOUNT_DATA_FLAGS
474 #endif
475
476 #define ext4_set_bit ext2_set_bit
477 #define ext4_set_bit_atomic ext2_set_bit_atomic
478 #define ext4_clear_bit ext2_clear_bit
479 #define ext4_clear_bit_atomic ext2_clear_bit_atomic
480 #define ext4_test_bit ext2_test_bit
481 #define ext4_find_first_zero_bit ext2_find_first_zero_bit
482 #define ext4_find_next_zero_bit ext2_find_next_zero_bit
483
484 /*
485 * Maximal mount counts between two filesystem checks
486 */
487 #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
488 #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */
489
490 /*
491 * Behaviour when detecting errors
492 */
493 #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */
494 #define EXT4_ERRORS_RO 2 /* Remount fs read-only */
495 #define EXT4_ERRORS_PANIC 3 /* Panic */
496 #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE
497
498 /*
499 * Structure of the super block
500 */
501 struct ext4_super_block {
502 /*00*/ __le32 s_inodes_count; /* Inodes count */
503 __le32 s_blocks_count_lo; /* Blocks count */
504 __le32 s_r_blocks_count_lo; /* Reserved blocks count */
505 __le32 s_free_blocks_count_lo; /* Free blocks count */
506 /*10*/ __le32 s_free_inodes_count; /* Free inodes count */
507 __le32 s_first_data_block; /* First Data Block */
508 __le32 s_log_block_size; /* Block size */
509 __le32 s_obso_log_frag_size; /* Obsoleted fragment size */
510 /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */
511 __le32 s_obso_frags_per_group; /* Obsoleted fragments per group */
512 __le32 s_inodes_per_group; /* # Inodes per group */
513 __le32 s_mtime; /* Mount time */
514 /*30*/ __le32 s_wtime; /* Write time */
515 __le16 s_mnt_count; /* Mount count */
516 __le16 s_max_mnt_count; /* Maximal mount count */
517 __le16 s_magic; /* Magic signature */
518 __le16 s_state; /* File system state */
519 __le16 s_errors; /* Behaviour when detecting errors */
520 __le16 s_minor_rev_level; /* minor revision level */
521 /*40*/ __le32 s_lastcheck; /* time of last check */
522 __le32 s_checkinterval; /* max. time between checks */
523 __le32 s_creator_os; /* OS */
524 __le32 s_rev_level; /* Revision level */
525 /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */
526 __le16 s_def_resgid; /* Default gid for reserved blocks */
527 /*
528 * These fields are for EXT4_DYNAMIC_REV superblocks only.
529 *
530 * Note: the difference between the compatible feature set and
531 * the incompatible feature set is that if there is a bit set
532 * in the incompatible feature set that the kernel doesn't
533 * know about, it should refuse to mount the filesystem.
534 *
535 * e2fsck's requirements are more strict; if it doesn't know
536 * about a feature in either the compatible or incompatible
537 * feature set, it must abort and not try to meddle with
538 * things it doesn't understand...
539 */
540 __le32 s_first_ino; /* First non-reserved inode */
541 __le16 s_inode_size; /* size of inode structure */
542 __le16 s_block_group_nr; /* block group # of this superblock */
543 __le32 s_feature_compat; /* compatible feature set */
544 /*60*/ __le32 s_feature_incompat; /* incompatible feature set */
545 __le32 s_feature_ro_compat; /* readonly-compatible feature set */
546 /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */
547 /*78*/ char s_volume_name[16]; /* volume name */
548 /*88*/ char s_last_mounted[64]; /* directory where last mounted */
549 /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */
550 /*
551 * Performance hints. Directory preallocation should only
552 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
553 */
554 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/
555 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */
556 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */
557 /*
558 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
559 */
560 /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */
561 /*E0*/ __le32 s_journal_inum; /* inode number of journal file */
562 __le32 s_journal_dev; /* device number of journal file */
563 __le32 s_last_orphan; /* start of list of inodes to delete */
564 __le32 s_hash_seed[4]; /* HTREE hash seed */
565 __u8 s_def_hash_version; /* Default hash version to use */
566 __u8 s_reserved_char_pad;
567 __le16 s_desc_size; /* size of group descriptor */
568 /*100*/ __le32 s_default_mount_opts;
569 __le32 s_first_meta_bg; /* First metablock block group */
570 __le32 s_mkfs_time; /* When the filesystem was created */
571 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */
572 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
573 /*150*/ __le32 s_blocks_count_hi; /* Blocks count */
574 __le32 s_r_blocks_count_hi; /* Reserved blocks count */
575 __le32 s_free_blocks_count_hi; /* Free blocks count */
576 __le16 s_min_extra_isize; /* All inodes have at least # bytes */
577 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */
578 __le32 s_flags; /* Miscellaneous flags */
579 __le16 s_raid_stride; /* RAID stride */
580 __le16 s_mmp_interval; /* # seconds to wait in MMP checking */
581 __le64 s_mmp_block; /* Block for multi-mount protection */
582 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/
583 __u32 s_reserved[163]; /* Padding to the end of the block */
584 };
585
586 #ifdef __KERNEL__
587 static inline struct ext4_sb_info * EXT4_SB(struct super_block *sb)
588 {
589 return sb->s_fs_info;
590 }
591 static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
592 {
593 return container_of(inode, struct ext4_inode_info, vfs_inode);
594 }
595
596 static inline struct timespec ext4_current_time(struct inode *inode)
597 {
598 return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ?
599 current_fs_time(inode->i_sb) : CURRENT_TIME_SEC;
600 }
601
602
603 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
604 {
605 return ino == EXT4_ROOT_INO ||
606 ino == EXT4_JOURNAL_INO ||
607 ino == EXT4_RESIZE_INO ||
608 (ino >= EXT4_FIRST_INO(sb) &&
609 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
610 }
611 #else
612 /* Assume that user mode programs are passing in an ext4fs superblock, not
613 * a kernel struct super_block. This will allow us to call the feature-test
614 * macros from user land. */
615 #define EXT4_SB(sb) (sb)
616 #endif
617
618 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
619
620 /*
621 * Codes for operating systems
622 */
623 #define EXT4_OS_LINUX 0
624 #define EXT4_OS_HURD 1
625 #define EXT4_OS_MASIX 2
626 #define EXT4_OS_FREEBSD 3
627 #define EXT4_OS_LITES 4
628
629 /*
630 * Revision levels
631 */
632 #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */
633 #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
634
635 #define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV
636 #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV
637
638 #define EXT4_GOOD_OLD_INODE_SIZE 128
639
640 /*
641 * Feature set definitions
642 */
643
644 #define EXT4_HAS_COMPAT_FEATURE(sb,mask) \
645 ( EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask) )
646 #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \
647 ( EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask) )
648 #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \
649 ( EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask) )
650 #define EXT4_SET_COMPAT_FEATURE(sb,mask) \
651 EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
652 #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \
653 EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
654 #define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \
655 EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
656 #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \
657 EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
658 #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \
659 EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
660 #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \
661 EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
662
663 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001
664 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002
665 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004
666 #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008
667 #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010
668 #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020
669
670 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
671 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
672 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
673 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010
674 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020
675 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040
676
677 #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001
678 #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002
679 #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */
680 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */
681 #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010
682 #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */
683 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080
684 #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200
685
686 #define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR
687 #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
688 EXT4_FEATURE_INCOMPAT_RECOVER| \
689 EXT4_FEATURE_INCOMPAT_META_BG| \
690 EXT4_FEATURE_INCOMPAT_EXTENTS| \
691 EXT4_FEATURE_INCOMPAT_64BIT| \
692 EXT4_FEATURE_INCOMPAT_FLEX_BG)
693 #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
694 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
695 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
696 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
697 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
698 EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
699
700 /*
701 * Default values for user and/or group using reserved blocks
702 */
703 #define EXT4_DEF_RESUID 0
704 #define EXT4_DEF_RESGID 0
705
706 /*
707 * Default mount options
708 */
709 #define EXT4_DEFM_DEBUG 0x0001
710 #define EXT4_DEFM_BSDGROUPS 0x0002
711 #define EXT4_DEFM_XATTR_USER 0x0004
712 #define EXT4_DEFM_ACL 0x0008
713 #define EXT4_DEFM_UID16 0x0010
714 #define EXT4_DEFM_JMODE 0x0060
715 #define EXT4_DEFM_JMODE_DATA 0x0020
716 #define EXT4_DEFM_JMODE_ORDERED 0x0040
717 #define EXT4_DEFM_JMODE_WBACK 0x0060
718
719 /*
720 * Structure of a directory entry
721 */
722 #define EXT4_NAME_LEN 255
723
724 struct ext4_dir_entry {
725 __le32 inode; /* Inode number */
726 __le16 rec_len; /* Directory entry length */
727 __le16 name_len; /* Name length */
728 char name[EXT4_NAME_LEN]; /* File name */
729 };
730
731 /*
732 * The new version of the directory entry. Since EXT4 structures are
733 * stored in intel byte order, and the name_len field could never be
734 * bigger than 255 chars, it's safe to reclaim the extra byte for the
735 * file_type field.
736 */
737 struct ext4_dir_entry_2 {
738 __le32 inode; /* Inode number */
739 __le16 rec_len; /* Directory entry length */
740 __u8 name_len; /* Name length */
741 __u8 file_type;
742 char name[EXT4_NAME_LEN]; /* File name */
743 };
744
745 /*
746 * Ext4 directory file types. Only the low 3 bits are used. The
747 * other bits are reserved for now.
748 */
749 #define EXT4_FT_UNKNOWN 0
750 #define EXT4_FT_REG_FILE 1
751 #define EXT4_FT_DIR 2
752 #define EXT4_FT_CHRDEV 3
753 #define EXT4_FT_BLKDEV 4
754 #define EXT4_FT_FIFO 5
755 #define EXT4_FT_SOCK 6
756 #define EXT4_FT_SYMLINK 7
757
758 #define EXT4_FT_MAX 8
759
760 /*
761 * EXT4_DIR_PAD defines the directory entries boundaries
762 *
763 * NOTE: It must be a multiple of 4
764 */
765 #define EXT4_DIR_PAD 4
766 #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1)
767 #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \
768 ~EXT4_DIR_ROUND)
769 #define EXT4_MAX_REC_LEN ((1<<16)-1)
770
771 static inline unsigned ext4_rec_len_from_disk(__le16 dlen)
772 {
773 unsigned len = le16_to_cpu(dlen);
774
775 if (len == EXT4_MAX_REC_LEN)
776 return 1 << 16;
777 return len;
778 }
779
780 static inline __le16 ext4_rec_len_to_disk(unsigned len)
781 {
782 if (len == (1 << 16))
783 return cpu_to_le16(EXT4_MAX_REC_LEN);
784 else if (len > (1 << 16))
785 BUG();
786 return cpu_to_le16(len);
787 }
788
789 /*
790 * Hash Tree Directory indexing
791 * (c) Daniel Phillips, 2001
792 */
793
794 #define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \
795 EXT4_FEATURE_COMPAT_DIR_INDEX) && \
796 (EXT4_I(dir)->i_flags & EXT4_INDEX_FL))
797 #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX)
798 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
799
800 /* Legal values for the dx_root hash_version field: */
801
802 #define DX_HASH_LEGACY 0
803 #define DX_HASH_HALF_MD4 1
804 #define DX_HASH_TEA 2
805
806 #ifdef __KERNEL__
807
808 /* hash info structure used by the directory hash */
809 struct dx_hash_info
810 {
811 u32 hash;
812 u32 minor_hash;
813 int hash_version;
814 u32 *seed;
815 };
816
817 #define EXT4_HTREE_EOF 0x7fffffff
818
819 /*
820 * Control parameters used by ext4_htree_next_block
821 */
822 #define HASH_NB_ALWAYS 1
823
824
825 /*
826 * Describe an inode's exact location on disk and in memory
827 */
828 struct ext4_iloc
829 {
830 struct buffer_head *bh;
831 unsigned long offset;
832 ext4_group_t block_group;
833 };
834
835 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
836 {
837 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
838 }
839
840 /*
841 * This structure is stuffed into the struct file's private_data field
842 * for directories. It is where we put information so that we can do
843 * readdir operations in hash tree order.
844 */
845 struct dir_private_info {
846 struct rb_root root;
847 struct rb_node *curr_node;
848 struct fname *extra_fname;
849 loff_t last_pos;
850 __u32 curr_hash;
851 __u32 curr_minor_hash;
852 __u32 next_hash;
853 };
854
855 /* calculate the first block number of the group */
856 static inline ext4_fsblk_t
857 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no)
858 {
859 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
860 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
861 }
862
863 /*
864 * Special error return code only used by dx_probe() and its callers.
865 */
866 #define ERR_BAD_DX_DIR -75000
867
868 void ext4_get_group_no_and_offset(struct super_block *sb, ext4_fsblk_t blocknr,
869 unsigned long *blockgrpp, ext4_grpblk_t *offsetp);
870
871 /*
872 * Function prototypes
873 */
874
875 /*
876 * Ok, these declarations are also in <linux/kernel.h> but none of the
877 * ext4 source programs needs to include it so they are duplicated here.
878 */
879 # define NORET_TYPE /**/
880 # define ATTRIB_NORET __attribute__((noreturn))
881 # define NORET_AND noreturn,
882
883 /* balloc.c */
884 extern unsigned int ext4_block_group(struct super_block *sb,
885 ext4_fsblk_t blocknr);
886 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb,
887 ext4_fsblk_t blocknr);
888 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group);
889 extern unsigned long ext4_bg_num_gdb(struct super_block *sb,
890 ext4_group_t group);
891 extern ext4_fsblk_t ext4_new_block (handle_t *handle, struct inode *inode,
892 ext4_fsblk_t goal, int *errp);
893 extern ext4_fsblk_t ext4_new_blocks (handle_t *handle, struct inode *inode,
894 ext4_fsblk_t goal, unsigned long *count, int *errp);
895 extern ext4_fsblk_t ext4_new_blocks_old(handle_t *handle, struct inode *inode,
896 ext4_fsblk_t goal, unsigned long *count, int *errp);
897 extern void ext4_free_blocks (handle_t *handle, struct inode *inode,
898 ext4_fsblk_t block, unsigned long count);
899 extern void ext4_free_blocks_sb (handle_t *handle, struct super_block *sb,
900 ext4_fsblk_t block, unsigned long count,
901 unsigned long *pdquot_freed_blocks);
902 extern ext4_fsblk_t ext4_count_free_blocks (struct super_block *);
903 extern void ext4_check_blocks_bitmap (struct super_block *);
904 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
905 ext4_group_t block_group,
906 struct buffer_head ** bh);
907 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
908 extern void ext4_init_block_alloc_info(struct inode *);
909 extern void ext4_rsv_window_add(struct super_block *sb, struct ext4_reserve_window_node *rsv);
910
911 /* dir.c */
912 extern int ext4_check_dir_entry(const char *, struct inode *,
913 struct ext4_dir_entry_2 *,
914 struct buffer_head *, unsigned long);
915 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
916 __u32 minor_hash,
917 struct ext4_dir_entry_2 *dirent);
918 extern void ext4_htree_free_dir_info(struct dir_private_info *p);
919
920 /* fsync.c */
921 extern int ext4_sync_file (struct file *, struct dentry *, int);
922
923 /* hash.c */
924 extern int ext4fs_dirhash(const char *name, int len, struct
925 dx_hash_info *hinfo);
926
927 /* ialloc.c */
928 extern struct inode * ext4_new_inode (handle_t *, struct inode *, int);
929 extern void ext4_free_inode (handle_t *, struct inode *);
930 extern struct inode * ext4_orphan_get (struct super_block *, unsigned long);
931 extern unsigned long ext4_count_free_inodes (struct super_block *);
932 extern unsigned long ext4_count_dirs (struct super_block *);
933 extern void ext4_check_inodes_bitmap (struct super_block *);
934 extern unsigned long ext4_count_free (struct buffer_head *, unsigned);
935
936
937 /* inode.c */
938 int ext4_forget(handle_t *handle, int is_metadata, struct inode *inode,
939 struct buffer_head *bh, ext4_fsblk_t blocknr);
940 struct buffer_head *ext4_getblk(handle_t *, struct inode *,
941 ext4_lblk_t, int, int *);
942 struct buffer_head *ext4_bread(handle_t *, struct inode *,
943 ext4_lblk_t, int, int *);
944 int ext4_get_blocks_handle(handle_t *handle, struct inode *inode,
945 ext4_lblk_t iblock, unsigned long maxblocks,
946 struct buffer_head *bh_result,
947 int create, int extend_disksize);
948
949 extern void ext4_read_inode (struct inode *);
950 extern int ext4_write_inode (struct inode *, int);
951 extern int ext4_setattr (struct dentry *, struct iattr *);
952 extern void ext4_delete_inode (struct inode *);
953 extern int ext4_sync_inode (handle_t *, struct inode *);
954 extern void ext4_discard_reservation (struct inode *);
955 extern void ext4_dirty_inode(struct inode *);
956 extern int ext4_change_inode_journal_flag(struct inode *, int);
957 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
958 extern void ext4_truncate (struct inode *);
959 extern void ext4_set_inode_flags(struct inode *);
960 extern void ext4_get_inode_flags(struct ext4_inode_info *);
961 extern void ext4_set_aops(struct inode *inode);
962 extern int ext4_writepage_trans_blocks(struct inode *);
963 extern int ext4_block_truncate_page(handle_t *handle, struct page *page,
964 struct address_space *mapping, loff_t from);
965
966 /* ioctl.c */
967 extern int ext4_ioctl (struct inode *, struct file *, unsigned int,
968 unsigned long);
969 extern long ext4_compat_ioctl (struct file *, unsigned int, unsigned long);
970
971 /* namei.c */
972 extern int ext4_orphan_add(handle_t *, struct inode *);
973 extern int ext4_orphan_del(handle_t *, struct inode *);
974 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
975 __u32 start_minor_hash, __u32 *next_hash);
976
977 /* resize.c */
978 extern int ext4_group_add(struct super_block *sb,
979 struct ext4_new_group_data *input);
980 extern int ext4_group_extend(struct super_block *sb,
981 struct ext4_super_block *es,
982 ext4_fsblk_t n_blocks_count);
983
984 /* super.c */
985 extern void ext4_error (struct super_block *, const char *, const char *, ...)
986 __attribute__ ((format (printf, 3, 4)));
987 extern void __ext4_std_error (struct super_block *, const char *, int);
988 extern void ext4_abort (struct super_block *, const char *, const char *, ...)
989 __attribute__ ((format (printf, 3, 4)));
990 extern void ext4_warning (struct super_block *, const char *, const char *, ...)
991 __attribute__ ((format (printf, 3, 4)));
992 extern void ext4_update_dynamic_rev (struct super_block *sb);
993 extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb,
994 __u32 compat);
995 extern int ext4_update_rocompat_feature(handle_t *handle,
996 struct super_block *sb, __u32 rocompat);
997 extern int ext4_update_incompat_feature(handle_t *handle,
998 struct super_block *sb, __u32 incompat);
999 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
1000 struct ext4_group_desc *bg);
1001 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
1002 struct ext4_group_desc *bg);
1003 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
1004 struct ext4_group_desc *bg);
1005 extern void ext4_block_bitmap_set(struct super_block *sb,
1006 struct ext4_group_desc *bg, ext4_fsblk_t blk);
1007 extern void ext4_inode_bitmap_set(struct super_block *sb,
1008 struct ext4_group_desc *bg, ext4_fsblk_t blk);
1009 extern void ext4_inode_table_set(struct super_block *sb,
1010 struct ext4_group_desc *bg, ext4_fsblk_t blk);
1011
1012 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
1013 {
1014 return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) |
1015 le32_to_cpu(es->s_blocks_count_lo);
1016 }
1017
1018 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
1019 {
1020 return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) |
1021 le32_to_cpu(es->s_r_blocks_count_lo);
1022 }
1023
1024 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
1025 {
1026 return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) |
1027 le32_to_cpu(es->s_free_blocks_count_lo);
1028 }
1029
1030 static inline void ext4_blocks_count_set(struct ext4_super_block *es,
1031 ext4_fsblk_t blk)
1032 {
1033 es->s_blocks_count_lo = cpu_to_le32((u32)blk);
1034 es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
1035 }
1036
1037 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
1038 ext4_fsblk_t blk)
1039 {
1040 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk);
1041 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
1042 }
1043
1044 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
1045 ext4_fsblk_t blk)
1046 {
1047 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk);
1048 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
1049 }
1050
1051 static inline loff_t ext4_isize(struct ext4_inode *raw_inode)
1052 {
1053 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) |
1054 le32_to_cpu(raw_inode->i_size_lo);
1055 }
1056
1057 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size)
1058 {
1059 raw_inode->i_size_lo = cpu_to_le32(i_size);
1060 raw_inode->i_size_high = cpu_to_le32(i_size >> 32);
1061 }
1062
1063 #define ext4_std_error(sb, errno) \
1064 do { \
1065 if ((errno)) \
1066 __ext4_std_error((sb), __FUNCTION__, (errno)); \
1067 } while (0)
1068
1069 /*
1070 * Inodes and files operations
1071 */
1072
1073 /* dir.c */
1074 extern const struct file_operations ext4_dir_operations;
1075
1076 /* file.c */
1077 extern const struct inode_operations ext4_file_inode_operations;
1078 extern const struct file_operations ext4_file_operations;
1079
1080 /* namei.c */
1081 extern const struct inode_operations ext4_dir_inode_operations;
1082 extern const struct inode_operations ext4_special_inode_operations;
1083
1084 /* symlink.c */
1085 extern const struct inode_operations ext4_symlink_inode_operations;
1086 extern const struct inode_operations ext4_fast_symlink_inode_operations;
1087
1088 /* extents.c */
1089 extern int ext4_ext_tree_init(handle_t *handle, struct inode *);
1090 extern int ext4_ext_writepage_trans_blocks(struct inode *, int);
1091 extern int ext4_ext_get_blocks(handle_t *handle, struct inode *inode,
1092 ext4_lblk_t iblock,
1093 unsigned long max_blocks, struct buffer_head *bh_result,
1094 int create, int extend_disksize);
1095 extern void ext4_ext_truncate(struct inode *, struct page *);
1096 extern void ext4_ext_init(struct super_block *);
1097 extern void ext4_ext_release(struct super_block *);
1098 extern long ext4_fallocate(struct inode *inode, int mode, loff_t offset,
1099 loff_t len);
1100 static inline int
1101 ext4_get_blocks_wrap(handle_t *handle, struct inode *inode, sector_t block,
1102 unsigned long max_blocks, struct buffer_head *bh,
1103 int create, int extend_disksize)
1104 {
1105 int retval;
1106 if (EXT4_I(inode)->i_flags & EXT4_EXTENTS_FL) {
1107 retval = ext4_ext_get_blocks(handle, inode,
1108 (ext4_lblk_t)block, max_blocks,
1109 bh, create, extend_disksize);
1110 } else {
1111 retval = ext4_get_blocks_handle(handle, inode,
1112 (ext4_lblk_t)block, max_blocks,
1113 bh, create, extend_disksize);
1114 }
1115 return retval;
1116 }
1117
1118
1119 #endif /* __KERNEL__ */
1120
1121 #endif /* _LINUX_EXT4_FS_H */
kernel-based virtual machine