Commit | Line | Data |
---|---|---|
ac27a0ec | 1 | /* |
617ba13b | 2 | * linux/include/linux/ext4_fs.h |
ac27a0ec DK |
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 | ||
617ba13b MC |
16 | #ifndef _LINUX_EXT4_FS_H |
17 | #define _LINUX_EXT4_FS_H | |
ac27a0ec DK |
18 | |
19 | #include <linux/types.h> | |
3a5b2ecd | 20 | #include <linux/blkdev.h> |
ac27a0ec DK |
21 | #include <linux/magic.h> |
22 | ||
23 | /* | |
24 | * The second extended filesystem constants/structures | |
25 | */ | |
26 | ||
27 | /* | |
617ba13b | 28 | * Define EXT4FS_DEBUG to produce debug messages |
ac27a0ec | 29 | */ |
617ba13b | 30 | #undef EXT4FS_DEBUG |
ac27a0ec DK |
31 | |
32 | /* | |
617ba13b | 33 | * Define EXT4_RESERVATION to reserve data blocks for expanding files |
ac27a0ec | 34 | */ |
8c55e204 | 35 | #define EXT4_DEFAULT_RESERVE_BLOCKS 8 |
ac27a0ec | 36 | /*max window size: 1024(direct blocks) + 3([t,d]indirect blocks) */ |
8c55e204 | 37 | #define EXT4_MAX_RESERVE_BLOCKS 1027 |
617ba13b | 38 | #define EXT4_RESERVE_WINDOW_NOT_ALLOCATED 0 |
ac27a0ec DK |
39 | |
40 | /* | |
41 | * Debug code | |
42 | */ | |
617ba13b MC |
43 | #ifdef EXT4FS_DEBUG |
44 | #define ext4_debug(f, a...) \ | |
ac27a0ec | 45 | do { \ |
617ba13b | 46 | printk (KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \ |
ac27a0ec DK |
47 | __FILE__, __LINE__, __FUNCTION__); \ |
48 | printk (KERN_DEBUG f, ## a); \ | |
49 | } while (0) | |
50 | #else | |
617ba13b | 51 | #define ext4_debug(f, a...) do {} while (0) |
ac27a0ec DK |
52 | #endif |
53 | ||
54 | /* | |
55 | * Special inodes numbers | |
56 | */ | |
617ba13b MC |
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 */ | |
ac27a0ec | 63 | |
617ba13b MC |
64 | /* First non-reserved inode for old ext4 filesystems */ |
65 | #define EXT4_GOOD_OLD_FIRST_INO 11 | |
ac27a0ec DK |
66 | |
67 | /* | |
68 | * Maximal count of links to a file | |
69 | */ | |
f8628a14 | 70 | #define EXT4_LINK_MAX 65000 |
ac27a0ec DK |
71 | |
72 | /* | |
73 | * Macro-instructions used to manage several block sizes | |
74 | */ | |
617ba13b MC |
75 | #define EXT4_MIN_BLOCK_SIZE 1024 |
76 | #define EXT4_MAX_BLOCK_SIZE 4096 | |
77 | #define EXT4_MIN_BLOCK_LOG_SIZE 10 | |
ac27a0ec | 78 | #ifdef __KERNEL__ |
617ba13b | 79 | # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize) |
ac27a0ec | 80 | #else |
617ba13b | 81 | # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size) |
ac27a0ec | 82 | #endif |
617ba13b | 83 | #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof (__u32)) |
ac27a0ec | 84 | #ifdef __KERNEL__ |
617ba13b | 85 | # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits) |
ac27a0ec | 86 | #else |
617ba13b | 87 | # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10) |
ac27a0ec DK |
88 | #endif |
89 | #ifdef __KERNEL__ | |
617ba13b MC |
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) | |
ac27a0ec | 93 | #else |
617ba13b MC |
94 | #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ |
95 | EXT4_GOOD_OLD_INODE_SIZE : \ | |
ac27a0ec | 96 | (s)->s_inode_size) |
617ba13b MC |
97 | #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ |
98 | EXT4_GOOD_OLD_FIRST_INO : \ | |
ac27a0ec DK |
99 | (s)->s_first_ino) |
100 | #endif | |
a2df2a63 | 101 | #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits))) |
ac27a0ec | 102 | |
ac27a0ec DK |
103 | /* |
104 | * Structure of a blocks group descriptor | |
105 | */ | |
617ba13b | 106 | struct ext4_group_desc |
ac27a0ec | 107 | { |
3a14589c | 108 | __le32 bg_block_bitmap_lo; /* Blocks bitmap block */ |
5272f837 AK |
109 | __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */ |
110 | __le32 bg_inode_table_lo; /* Inodes table block */ | |
ac27a0ec DK |
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 */ | |
717d50e4 AD |
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) */ | |
8fadc143 AR |
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 */ | |
ac27a0ec DK |
121 | }; |
122 | ||
717d50e4 AD |
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 | ||
bd81d8ee LV |
127 | #ifdef __KERNEL__ |
128 | #include <linux/ext4_fs_i.h> | |
129 | #include <linux/ext4_fs_sb.h> | |
130 | #endif | |
ac27a0ec DK |
131 | /* |
132 | * Macro-instructions used to manage group descriptors | |
133 | */ | |
0d1ee42f | 134 | #define EXT4_MIN_DESC_SIZE 32 |
8fadc143 | 135 | #define EXT4_MIN_DESC_SIZE_64BIT 64 |
0d1ee42f AR |
136 | #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE |
137 | #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size) | |
ac27a0ec | 138 | #ifdef __KERNEL__ |
617ba13b MC |
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) | |
ac27a0ec | 143 | #else |
617ba13b | 144 | # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group) |
0d1ee42f | 145 | # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s)) |
617ba13b | 146 | # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group) |
ac27a0ec DK |
147 | #endif |
148 | ||
149 | /* | |
150 | * Constants relative to the data blocks | |
151 | */ | |
617ba13b MC |
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) | |
ac27a0ec DK |
157 | |
158 | /* | |
159 | * Inode flags | |
160 | */ | |
617ba13b MC |
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 */ | |
ac27a0ec | 169 | /* Reserved for compression usage... */ |
617ba13b MC |
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 */ | |
ac27a0ec | 174 | /* End compression flags --- maybe not all used */ |
617ba13b MC |
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 */ | |
a86c6181 | 182 | #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */ |
ac27a0ec | 183 | |
a86c6181 | 184 | #define EXT4_FL_USER_VISIBLE 0x000BDFFF /* User visible flags */ |
617ba13b | 185 | #define EXT4_FL_USER_MODIFIABLE 0x000380FF /* User modifiable flags */ |
ac27a0ec DK |
186 | |
187 | /* | |
188 | * Inode dynamic state flags | |
189 | */ | |
617ba13b MC |
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 */ | |
6dd4ee7c | 193 | #define EXT4_STATE_NO_EXPAND 0x00000008 /* No space for expansion */ |
ac27a0ec DK |
194 | |
195 | /* Used to pass group descriptor data when online resize is done */ | |
617ba13b | 196 | struct ext4_new_group_input { |
8c55e204 DK |
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 */ | |
ac27a0ec DK |
203 | __u16 unused; |
204 | }; | |
205 | ||
617ba13b MC |
206 | /* The struct ext4_new_group_input in kernel space, with free_blocks_count */ |
207 | struct ext4_new_group_data { | |
ac27a0ec | 208 | __u32 group; |
bd81d8ee LV |
209 | __u64 block_bitmap; |
210 | __u64 inode_bitmap; | |
211 | __u64 inode_table; | |
ac27a0ec DK |
212 | __u32 blocks_count; |
213 | __u16 reserved_blocks; | |
214 | __u16 unused; | |
215 | __u32 free_blocks_count; | |
216 | }; | |
217 | ||
a2df2a63 AA |
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 | |
ac27a0ec DK |
223 | |
224 | /* | |
225 | * ioctl commands | |
226 | */ | |
617ba13b MC |
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 | |
e23291b9 | 235 | #ifdef CONFIG_JBD2_DEBUG |
617ba13b | 236 | #define EXT4_IOC_WAIT_FOR_READONLY _IOR('f', 99, long) |
ac27a0ec | 237 | #endif |
617ba13b MC |
238 | #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long) |
239 | #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long) | |
ac27a0ec DK |
240 | |
241 | /* | |
242 | * ioctl commands in 32 bit emulation | |
243 | */ | |
617ba13b MC |
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) | |
e23291b9 | 251 | #ifdef CONFIG_JBD2_DEBUG |
617ba13b | 252 | #define EXT4_IOC32_WAIT_FOR_READONLY _IOR('f', 99, int) |
ac27a0ec | 253 | #endif |
617ba13b MC |
254 | #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION |
255 | #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION | |
ac27a0ec DK |
256 | |
257 | ||
258 | /* | |
259 | * Mount options | |
260 | */ | |
617ba13b | 261 | struct ext4_mount_options { |
ac27a0ec DK |
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 | */ | |
617ba13b | 275 | struct ext4_inode { |
ac27a0ec DK |
276 | __le16 i_mode; /* File mode */ |
277 | __le16 i_uid; /* Low 16 bits of Owner Uid */ | |
278 | __le32 i_size; /* Size in bytes */ | |
279 | __le32 i_atime; /* Access time */ | |
ef7f3835 | 280 | __le32 i_ctime; /* Inode Change time */ |
ac27a0ec DK |
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 */ | |
617ba13b | 298 | __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */ |
ac27a0ec DK |
299 | __le32 i_generation; /* File version (for NFS) */ |
300 | __le32 i_file_acl; /* File ACL */ | |
301 | __le32 i_dir_acl; /* Directory ACL */ | |
f077d0d7 | 302 | __le32 i_obso_faddr; /* Obsoleted fragment address */ |
ac27a0ec DK |
303 | union { |
304 | struct { | |
f077d0d7 | 305 | __le16 l_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ |
a1ddeb7e | 306 | __le16 l_i_file_acl_high; |
8c55e204 | 307 | __le16 l_i_uid_high; /* these 2 fields */ |
ac27a0ec DK |
308 | __le16 l_i_gid_high; /* were reserved2[0] */ |
309 | __u32 l_i_reserved2; | |
310 | } linux2; | |
311 | struct { | |
f077d0d7 | 312 | __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ |
ac27a0ec DK |
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 { | |
f077d0d7 | 319 | __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ |
a1ddeb7e | 320 | __le16 m_i_file_acl_high; |
ac27a0ec DK |
321 | __u32 m_i_reserved2[2]; |
322 | } masix2; | |
323 | } osd2; /* OS dependent 2 */ | |
324 | __le16 i_extra_isize; | |
325 | __le16 i_pad1; | |
ef7f3835 KS |
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) */ | |
ac27a0ec DK |
331 | }; |
332 | ||
333 | #define i_size_high i_dir_acl | |
334 | ||
ef7f3835 KS |
335 | #define EXT4_EPOCH_BITS 2 |
336 | #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1) | |
337 | #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS) | |
338 | ||
339 | /* | |
340 | * Extended fields will fit into an inode if the filesystem was formatted | |
341 | * with large inodes (-I 256 or larger) and there are not currently any EAs | |
342 | * consuming all of the available space. For new inodes we always reserve | |
343 | * enough space for the kernel's known extended fields, but for inodes | |
344 | * created with an old kernel this might not have been the case. None of | |
345 | * the extended inode fields is critical for correct filesystem operation. | |
346 | * This macro checks if a certain field fits in the inode. Note that | |
347 | * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize | |
348 | */ | |
349 | #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \ | |
350 | ((offsetof(typeof(*ext4_inode), field) + \ | |
351 | sizeof((ext4_inode)->field)) \ | |
352 | <= (EXT4_GOOD_OLD_INODE_SIZE + \ | |
353 | (einode)->i_extra_isize)) \ | |
354 | ||
355 | static inline __le32 ext4_encode_extra_time(struct timespec *time) | |
356 | { | |
357 | return cpu_to_le32((sizeof(time->tv_sec) > 4 ? | |
358 | time->tv_sec >> 32 : 0) | | |
359 | ((time->tv_nsec << 2) & EXT4_NSEC_MASK)); | |
360 | } | |
361 | ||
362 | static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra) | |
363 | { | |
364 | if (sizeof(time->tv_sec) > 4) | |
365 | time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) | |
366 | << 32; | |
367 | time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> 2; | |
368 | } | |
369 | ||
370 | #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \ | |
371 | do { \ | |
372 | (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \ | |
373 | if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \ | |
374 | (raw_inode)->xtime ## _extra = \ | |
375 | ext4_encode_extra_time(&(inode)->xtime); \ | |
376 | } while (0) | |
377 | ||
378 | #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \ | |
379 | do { \ | |
380 | if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ | |
381 | (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \ | |
382 | if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ | |
383 | (raw_inode)->xtime ## _extra = \ | |
384 | ext4_encode_extra_time(&(einode)->xtime); \ | |
385 | } while (0) | |
386 | ||
387 | #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \ | |
388 | do { \ | |
389 | (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \ | |
390 | if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \ | |
391 | ext4_decode_extra_time(&(inode)->xtime, \ | |
392 | raw_inode->xtime ## _extra); \ | |
393 | } while (0) | |
394 | ||
395 | #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \ | |
396 | do { \ | |
397 | if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ | |
398 | (einode)->xtime.tv_sec = \ | |
399 | (signed)le32_to_cpu((raw_inode)->xtime); \ | |
400 | if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ | |
401 | ext4_decode_extra_time(&(einode)->xtime, \ | |
402 | raw_inode->xtime ## _extra); \ | |
403 | } while (0) | |
404 | ||
ac27a0ec DK |
405 | #if defined(__KERNEL__) || defined(__linux__) |
406 | #define i_reserved1 osd1.linux1.l_i_reserved1 | |
a1ddeb7e | 407 | #define i_file_acl_high osd2.linux2.l_i_file_acl_high |
ac27a0ec DK |
408 | #define i_uid_low i_uid |
409 | #define i_gid_low i_gid | |
410 | #define i_uid_high osd2.linux2.l_i_uid_high | |
411 | #define i_gid_high osd2.linux2.l_i_gid_high | |
412 | #define i_reserved2 osd2.linux2.l_i_reserved2 | |
413 | ||
414 | #elif defined(__GNU__) | |
415 | ||
416 | #define i_translator osd1.hurd1.h_i_translator | |
ac27a0ec DK |
417 | #define i_uid_high osd2.hurd2.h_i_uid_high |
418 | #define i_gid_high osd2.hurd2.h_i_gid_high | |
419 | #define i_author osd2.hurd2.h_i_author | |
420 | ||
421 | #elif defined(__masix__) | |
422 | ||
423 | #define i_reserved1 osd1.masix1.m_i_reserved1 | |
a1ddeb7e | 424 | #define i_file_acl_high osd2.masix2.m_i_file_acl_high |
ac27a0ec DK |
425 | #define i_reserved2 osd2.masix2.m_i_reserved2 |
426 | ||
427 | #endif /* defined(__KERNEL__) || defined(__linux__) */ | |
428 | ||
429 | /* | |
430 | * File system states | |
431 | */ | |
617ba13b MC |
432 | #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */ |
433 | #define EXT4_ERROR_FS 0x0002 /* Errors detected */ | |
434 | #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */ | |
ac27a0ec DK |
435 | |
436 | /* | |
437 | * Mount flags | |
438 | */ | |
617ba13b MC |
439 | #define EXT4_MOUNT_CHECK 0x00001 /* Do mount-time checks */ |
440 | #define EXT4_MOUNT_OLDALLOC 0x00002 /* Don't use the new Orlov allocator */ | |
441 | #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */ | |
442 | #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */ | |
443 | #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */ | |
444 | #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */ | |
445 | #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */ | |
446 | #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */ | |
447 | #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/ | |
448 | #define EXT4_MOUNT_ABORT 0x00200 /* Fatal error detected */ | |
449 | #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */ | |
450 | #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */ | |
451 | #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */ | |
452 | #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */ | |
453 | #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */ | |
454 | #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */ | |
455 | #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */ | |
456 | #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */ | |
457 | #define EXT4_MOUNT_RESERVATION 0x10000 /* Preallocation */ | |
458 | #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */ | |
459 | #define EXT4_MOUNT_NOBH 0x40000 /* No bufferheads */ | |
460 | #define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */ | |
461 | #define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */ | |
462 | #define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */ | |
a86c6181 | 463 | #define EXT4_MOUNT_EXTENTS 0x400000 /* Extents support */ |
617ba13b MC |
464 | |
465 | /* Compatibility, for having both ext2_fs.h and ext4_fs.h included at once */ | |
ac27a0ec | 466 | #ifndef _LINUX_EXT2_FS_H |
617ba13b MC |
467 | #define clear_opt(o, opt) o &= ~EXT4_MOUNT_##opt |
468 | #define set_opt(o, opt) o |= EXT4_MOUNT_##opt | |
469 | #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \ | |
470 | EXT4_MOUNT_##opt) | |
ac27a0ec | 471 | #else |
617ba13b MC |
472 | #define EXT2_MOUNT_NOLOAD EXT4_MOUNT_NOLOAD |
473 | #define EXT2_MOUNT_ABORT EXT4_MOUNT_ABORT | |
474 | #define EXT2_MOUNT_DATA_FLAGS EXT4_MOUNT_DATA_FLAGS | |
ac27a0ec DK |
475 | #endif |
476 | ||
617ba13b MC |
477 | #define ext4_set_bit ext2_set_bit |
478 | #define ext4_set_bit_atomic ext2_set_bit_atomic | |
479 | #define ext4_clear_bit ext2_clear_bit | |
480 | #define ext4_clear_bit_atomic ext2_clear_bit_atomic | |
481 | #define ext4_test_bit ext2_test_bit | |
482 | #define ext4_find_first_zero_bit ext2_find_first_zero_bit | |
483 | #define ext4_find_next_zero_bit ext2_find_next_zero_bit | |
ac27a0ec DK |
484 | |
485 | /* | |
486 | * Maximal mount counts between two filesystem checks | |
487 | */ | |
617ba13b MC |
488 | #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ |
489 | #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */ | |
ac27a0ec DK |
490 | |
491 | /* | |
492 | * Behaviour when detecting errors | |
493 | */ | |
617ba13b MC |
494 | #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */ |
495 | #define EXT4_ERRORS_RO 2 /* Remount fs read-only */ | |
496 | #define EXT4_ERRORS_PANIC 3 /* Panic */ | |
497 | #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE | |
ac27a0ec DK |
498 | |
499 | /* | |
500 | * Structure of the super block | |
501 | */ | |
617ba13b | 502 | struct ext4_super_block { |
ac27a0ec | 503 | /*00*/ __le32 s_inodes_count; /* Inodes count */ |
6bc9feff | 504 | __le32 s_blocks_count_lo; /* Blocks count */ |
ac27a0ec DK |
505 | __le32 s_r_blocks_count; /* Reserved blocks count */ |
506 | __le32 s_free_blocks_count; /* Free blocks count */ | |
507 | /*10*/ __le32 s_free_inodes_count; /* Free inodes count */ | |
508 | __le32 s_first_data_block; /* First Data Block */ | |
509 | __le32 s_log_block_size; /* Block size */ | |
f077d0d7 | 510 | __le32 s_obso_log_frag_size; /* Obsoleted fragment size */ |
ac27a0ec | 511 | /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */ |
f077d0d7 | 512 | __le32 s_obso_frags_per_group; /* Obsoleted fragments per group */ |
ac27a0ec DK |
513 | __le32 s_inodes_per_group; /* # Inodes per group */ |
514 | __le32 s_mtime; /* Mount time */ | |
515 | /*30*/ __le32 s_wtime; /* Write time */ | |
516 | __le16 s_mnt_count; /* Mount count */ | |
517 | __le16 s_max_mnt_count; /* Maximal mount count */ | |
518 | __le16 s_magic; /* Magic signature */ | |
519 | __le16 s_state; /* File system state */ | |
520 | __le16 s_errors; /* Behaviour when detecting errors */ | |
521 | __le16 s_minor_rev_level; /* minor revision level */ | |
522 | /*40*/ __le32 s_lastcheck; /* time of last check */ | |
523 | __le32 s_checkinterval; /* max. time between checks */ | |
524 | __le32 s_creator_os; /* OS */ | |
525 | __le32 s_rev_level; /* Revision level */ | |
526 | /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */ | |
527 | __le16 s_def_resgid; /* Default gid for reserved blocks */ | |
528 | /* | |
617ba13b | 529 | * These fields are for EXT4_DYNAMIC_REV superblocks only. |
ac27a0ec DK |
530 | * |
531 | * Note: the difference between the compatible feature set and | |
532 | * the incompatible feature set is that if there is a bit set | |
533 | * in the incompatible feature set that the kernel doesn't | |
534 | * know about, it should refuse to mount the filesystem. | |
535 | * | |
536 | * e2fsck's requirements are more strict; if it doesn't know | |
537 | * about a feature in either the compatible or incompatible | |
538 | * feature set, it must abort and not try to meddle with | |
539 | * things it doesn't understand... | |
540 | */ | |
541 | __le32 s_first_ino; /* First non-reserved inode */ | |
0d1ee42f | 542 | __le16 s_inode_size; /* size of inode structure */ |
ac27a0ec DK |
543 | __le16 s_block_group_nr; /* block group # of this superblock */ |
544 | __le32 s_feature_compat; /* compatible feature set */ | |
545 | /*60*/ __le32 s_feature_incompat; /* incompatible feature set */ | |
546 | __le32 s_feature_ro_compat; /* readonly-compatible feature set */ | |
547 | /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */ | |
548 | /*78*/ char s_volume_name[16]; /* volume name */ | |
549 | /*88*/ char s_last_mounted[64]; /* directory where last mounted */ | |
550 | /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */ | |
551 | /* | |
552 | * Performance hints. Directory preallocation should only | |
617ba13b | 553 | * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on. |
ac27a0ec DK |
554 | */ |
555 | __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ | |
556 | __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ | |
557 | __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */ | |
558 | /* | |
617ba13b | 559 | * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set. |
ac27a0ec DK |
560 | */ |
561 | /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */ | |
562 | /*E0*/ __le32 s_journal_inum; /* inode number of journal file */ | |
563 | __le32 s_journal_dev; /* device number of journal file */ | |
564 | __le32 s_last_orphan; /* start of list of inodes to delete */ | |
565 | __le32 s_hash_seed[4]; /* HTREE hash seed */ | |
566 | __u8 s_def_hash_version; /* Default hash version to use */ | |
567 | __u8 s_reserved_char_pad; | |
0d1ee42f | 568 | __le16 s_desc_size; /* size of group descriptor */ |
bd81d8ee | 569 | /*100*/ __le32 s_default_mount_opts; |
ac27a0ec | 570 | __le32 s_first_meta_bg; /* First metablock block group */ |
bd81d8ee LV |
571 | __le32 s_mkfs_time; /* When the filesystem was created */ |
572 | __le32 s_jnl_blocks[17]; /* Backup of the journal inode */ | |
573 | /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */ | |
574 | /*150*/ __le32 s_blocks_count_hi; /* Blocks count */ | |
575 | __le32 s_r_blocks_count_hi; /* Reserved blocks count */ | |
576 | __le32 s_free_blocks_count_hi; /* Free blocks count */ | |
c1bddad9 AK |
577 | __le16 s_min_extra_isize; /* All inodes have at least # bytes */ |
578 | __le16 s_want_extra_isize; /* New inodes should reserve # bytes */ | |
579 | __le32 s_flags; /* Miscellaneous flags */ | |
580 | __le16 s_raid_stride; /* RAID stride */ | |
581 | __le16 s_mmp_interval; /* # seconds to wait in MMP checking */ | |
582 | __le64 s_mmp_block; /* Block for multi-mount protection */ | |
583 | __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/ | |
436bd75e | 584 | __u32 s_reserved[163]; /* Padding to the end of the block */ |
ac27a0ec DK |
585 | }; |
586 | ||
587 | #ifdef __KERNEL__ | |
617ba13b | 588 | static inline struct ext4_sb_info * EXT4_SB(struct super_block *sb) |
ac27a0ec DK |
589 | { |
590 | return sb->s_fs_info; | |
591 | } | |
617ba13b | 592 | static inline struct ext4_inode_info *EXT4_I(struct inode *inode) |
ac27a0ec | 593 | { |
617ba13b | 594 | return container_of(inode, struct ext4_inode_info, vfs_inode); |
ac27a0ec DK |
595 | } |
596 | ||
ef7f3835 KS |
597 | static inline struct timespec ext4_current_time(struct inode *inode) |
598 | { | |
599 | return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ? | |
600 | current_fs_time(inode->i_sb) : CURRENT_TIME_SEC; | |
601 | } | |
602 | ||
603 | ||
617ba13b | 604 | static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino) |
ac27a0ec | 605 | { |
617ba13b MC |
606 | return ino == EXT4_ROOT_INO || |
607 | ino == EXT4_JOURNAL_INO || | |
608 | ino == EXT4_RESIZE_INO || | |
609 | (ino >= EXT4_FIRST_INO(sb) && | |
610 | ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count)); | |
ac27a0ec DK |
611 | } |
612 | #else | |
617ba13b | 613 | /* Assume that user mode programs are passing in an ext4fs superblock, not |
ac27a0ec DK |
614 | * a kernel struct super_block. This will allow us to call the feature-test |
615 | * macros from user land. */ | |
617ba13b | 616 | #define EXT4_SB(sb) (sb) |
ac27a0ec DK |
617 | #endif |
618 | ||
617ba13b | 619 | #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime |
ac27a0ec DK |
620 | |
621 | /* | |
622 | * Codes for operating systems | |
623 | */ | |
617ba13b MC |
624 | #define EXT4_OS_LINUX 0 |
625 | #define EXT4_OS_HURD 1 | |
626 | #define EXT4_OS_MASIX 2 | |
627 | #define EXT4_OS_FREEBSD 3 | |
628 | #define EXT4_OS_LITES 4 | |
ac27a0ec DK |
629 | |
630 | /* | |
631 | * Revision levels | |
632 | */ | |
617ba13b MC |
633 | #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */ |
634 | #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ | |
ac27a0ec | 635 | |
617ba13b MC |
636 | #define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV |
637 | #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV | |
ac27a0ec | 638 | |
617ba13b | 639 | #define EXT4_GOOD_OLD_INODE_SIZE 128 |
ac27a0ec DK |
640 | |
641 | /* | |
642 | * Feature set definitions | |
643 | */ | |
644 | ||
617ba13b MC |
645 | #define EXT4_HAS_COMPAT_FEATURE(sb,mask) \ |
646 | ( EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask) ) | |
647 | #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \ | |
648 | ( EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask) ) | |
649 | #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \ | |
650 | ( EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask) ) | |
651 | #define EXT4_SET_COMPAT_FEATURE(sb,mask) \ | |
652 | EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask) | |
653 | #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \ | |
654 | EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask) | |
655 | #define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \ | |
656 | EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask) | |
657 | #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \ | |
658 | EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask) | |
659 | #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \ | |
660 | EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask) | |
661 | #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \ | |
662 | EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask) | |
663 | ||
664 | #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001 | |
665 | #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002 | |
666 | #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004 | |
667 | #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008 | |
668 | #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010 | |
669 | #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020 | |
670 | ||
671 | #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 | |
672 | #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 | |
673 | #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 | |
717d50e4 | 674 | #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010 |
f8628a14 | 675 | #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020 |
ef7f3835 | 676 | #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040 |
617ba13b MC |
677 | |
678 | #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001 | |
679 | #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002 | |
680 | #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */ | |
681 | #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */ | |
682 | #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010 | |
a86c6181 | 683 | #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */ |
bd81d8ee | 684 | #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080 |
ce421581 | 685 | #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200 |
617ba13b MC |
686 | |
687 | #define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR | |
688 | #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ | |
689 | EXT4_FEATURE_INCOMPAT_RECOVER| \ | |
a86c6181 | 690 | EXT4_FEATURE_INCOMPAT_META_BG| \ |
bd81d8ee | 691 | EXT4_FEATURE_INCOMPAT_EXTENTS| \ |
ce421581 JS |
692 | EXT4_FEATURE_INCOMPAT_64BIT| \ |
693 | EXT4_FEATURE_INCOMPAT_FLEX_BG) | |
617ba13b MC |
694 | #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ |
695 | EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ | |
717d50e4 | 696 | EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \ |
f8628a14 | 697 | EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \ |
ef7f3835 | 698 | EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \ |
617ba13b | 699 | EXT4_FEATURE_RO_COMPAT_BTREE_DIR) |
ac27a0ec DK |
700 | |
701 | /* | |
702 | * Default values for user and/or group using reserved blocks | |
703 | */ | |
617ba13b MC |
704 | #define EXT4_DEF_RESUID 0 |
705 | #define EXT4_DEF_RESGID 0 | |
ac27a0ec DK |
706 | |
707 | /* | |
708 | * Default mount options | |
709 | */ | |
617ba13b MC |
710 | #define EXT4_DEFM_DEBUG 0x0001 |
711 | #define EXT4_DEFM_BSDGROUPS 0x0002 | |
712 | #define EXT4_DEFM_XATTR_USER 0x0004 | |
713 | #define EXT4_DEFM_ACL 0x0008 | |
714 | #define EXT4_DEFM_UID16 0x0010 | |
715 | #define EXT4_DEFM_JMODE 0x0060 | |
716 | #define EXT4_DEFM_JMODE_DATA 0x0020 | |
717 | #define EXT4_DEFM_JMODE_ORDERED 0x0040 | |
718 | #define EXT4_DEFM_JMODE_WBACK 0x0060 | |
ac27a0ec DK |
719 | |
720 | /* | |
721 | * Structure of a directory entry | |
722 | */ | |
617ba13b | 723 | #define EXT4_NAME_LEN 255 |
ac27a0ec | 724 | |
617ba13b | 725 | struct ext4_dir_entry { |
ac27a0ec DK |
726 | __le32 inode; /* Inode number */ |
727 | __le16 rec_len; /* Directory entry length */ | |
728 | __le16 name_len; /* Name length */ | |
617ba13b | 729 | char name[EXT4_NAME_LEN]; /* File name */ |
ac27a0ec DK |
730 | }; |
731 | ||
732 | /* | |
617ba13b | 733 | * The new version of the directory entry. Since EXT4 structures are |
ac27a0ec DK |
734 | * stored in intel byte order, and the name_len field could never be |
735 | * bigger than 255 chars, it's safe to reclaim the extra byte for the | |
736 | * file_type field. | |
737 | */ | |
617ba13b | 738 | struct ext4_dir_entry_2 { |
ac27a0ec DK |
739 | __le32 inode; /* Inode number */ |
740 | __le16 rec_len; /* Directory entry length */ | |
741 | __u8 name_len; /* Name length */ | |
742 | __u8 file_type; | |
617ba13b | 743 | char name[EXT4_NAME_LEN]; /* File name */ |
ac27a0ec DK |
744 | }; |
745 | ||
746 | /* | |
617ba13b | 747 | * Ext4 directory file types. Only the low 3 bits are used. The |
ac27a0ec DK |
748 | * other bits are reserved for now. |
749 | */ | |
617ba13b MC |
750 | #define EXT4_FT_UNKNOWN 0 |
751 | #define EXT4_FT_REG_FILE 1 | |
752 | #define EXT4_FT_DIR 2 | |
753 | #define EXT4_FT_CHRDEV 3 | |
754 | #define EXT4_FT_BLKDEV 4 | |
755 | #define EXT4_FT_FIFO 5 | |
756 | #define EXT4_FT_SOCK 6 | |
757 | #define EXT4_FT_SYMLINK 7 | |
ac27a0ec | 758 | |
617ba13b | 759 | #define EXT4_FT_MAX 8 |
ac27a0ec DK |
760 | |
761 | /* | |
617ba13b | 762 | * EXT4_DIR_PAD defines the directory entries boundaries |
ac27a0ec DK |
763 | * |
764 | * NOTE: It must be a multiple of 4 | |
765 | */ | |
617ba13b MC |
766 | #define EXT4_DIR_PAD 4 |
767 | #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1) | |
768 | #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \ | |
769 | ~EXT4_DIR_ROUND) | |
ac27a0ec DK |
770 | /* |
771 | * Hash Tree Directory indexing | |
772 | * (c) Daniel Phillips, 2001 | |
773 | */ | |
774 | ||
4074fe37 ES |
775 | #define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \ |
776 | EXT4_FEATURE_COMPAT_DIR_INDEX) && \ | |
617ba13b MC |
777 | (EXT4_I(dir)->i_flags & EXT4_INDEX_FL)) |
778 | #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX) | |
779 | #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1) | |
ac27a0ec DK |
780 | |
781 | /* Legal values for the dx_root hash_version field: */ | |
782 | ||
783 | #define DX_HASH_LEGACY 0 | |
784 | #define DX_HASH_HALF_MD4 1 | |
785 | #define DX_HASH_TEA 2 | |
786 | ||
787 | #ifdef __KERNEL__ | |
788 | ||
789 | /* hash info structure used by the directory hash */ | |
790 | struct dx_hash_info | |
791 | { | |
792 | u32 hash; | |
793 | u32 minor_hash; | |
794 | int hash_version; | |
795 | u32 *seed; | |
796 | }; | |
797 | ||
617ba13b | 798 | #define EXT4_HTREE_EOF 0x7fffffff |
ac27a0ec DK |
799 | |
800 | /* | |
617ba13b | 801 | * Control parameters used by ext4_htree_next_block |
ac27a0ec DK |
802 | */ |
803 | #define HASH_NB_ALWAYS 1 | |
804 | ||
805 | ||
806 | /* | |
807 | * Describe an inode's exact location on disk and in memory | |
808 | */ | |
617ba13b | 809 | struct ext4_iloc |
ac27a0ec DK |
810 | { |
811 | struct buffer_head *bh; | |
812 | unsigned long offset; | |
813 | unsigned long block_group; | |
814 | }; | |
815 | ||
617ba13b | 816 | static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc) |
ac27a0ec | 817 | { |
617ba13b | 818 | return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset); |
ac27a0ec DK |
819 | } |
820 | ||
821 | /* | |
822 | * This structure is stuffed into the struct file's private_data field | |
823 | * for directories. It is where we put information so that we can do | |
824 | * readdir operations in hash tree order. | |
825 | */ | |
826 | struct dir_private_info { | |
827 | struct rb_root root; | |
828 | struct rb_node *curr_node; | |
829 | struct fname *extra_fname; | |
830 | loff_t last_pos; | |
831 | __u32 curr_hash; | |
832 | __u32 curr_minor_hash; | |
833 | __u32 next_hash; | |
834 | }; | |
835 | ||
836 | /* calculate the first block number of the group */ | |
617ba13b MC |
837 | static inline ext4_fsblk_t |
838 | ext4_group_first_block_no(struct super_block *sb, unsigned long group_no) | |
ac27a0ec | 839 | { |
617ba13b MC |
840 | return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) + |
841 | le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block); | |
ac27a0ec DK |
842 | } |
843 | ||
844 | /* | |
845 | * Special error return code only used by dx_probe() and its callers. | |
846 | */ | |
847 | #define ERR_BAD_DX_DIR -75000 | |
848 | ||
72b64b59 AM |
849 | void ext4_get_group_no_and_offset(struct super_block *sb, ext4_fsblk_t blocknr, |
850 | unsigned long *blockgrpp, ext4_grpblk_t *offsetp); | |
3a5b2ecd | 851 | |
ac27a0ec DK |
852 | /* |
853 | * Function prototypes | |
854 | */ | |
855 | ||
856 | /* | |
857 | * Ok, these declarations are also in <linux/kernel.h> but none of the | |
617ba13b | 858 | * ext4 source programs needs to include it so they are duplicated here. |
ac27a0ec | 859 | */ |
8c55e204 DK |
860 | # define NORET_TYPE /**/ |
861 | # define ATTRIB_NORET __attribute__((noreturn)) | |
862 | # define NORET_AND noreturn, | |
ac27a0ec DK |
863 | |
864 | /* balloc.c */ | |
3a5b2ecd MC |
865 | extern unsigned int ext4_block_group(struct super_block *sb, |
866 | ext4_fsblk_t blocknr); | |
867 | extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb, | |
868 | ext4_fsblk_t blocknr); | |
617ba13b MC |
869 | extern int ext4_bg_has_super(struct super_block *sb, int group); |
870 | extern unsigned long ext4_bg_num_gdb(struct super_block *sb, int group); | |
871 | extern ext4_fsblk_t ext4_new_block (handle_t *handle, struct inode *inode, | |
872 | ext4_fsblk_t goal, int *errp); | |
873 | extern ext4_fsblk_t ext4_new_blocks (handle_t *handle, struct inode *inode, | |
874 | ext4_fsblk_t goal, unsigned long *count, int *errp); | |
875 | extern void ext4_free_blocks (handle_t *handle, struct inode *inode, | |
876 | ext4_fsblk_t block, unsigned long count); | |
877 | extern void ext4_free_blocks_sb (handle_t *handle, struct super_block *sb, | |
878 | ext4_fsblk_t block, unsigned long count, | |
ac27a0ec | 879 | unsigned long *pdquot_freed_blocks); |
617ba13b MC |
880 | extern ext4_fsblk_t ext4_count_free_blocks (struct super_block *); |
881 | extern void ext4_check_blocks_bitmap (struct super_block *); | |
882 | extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb, | |
ac27a0ec DK |
883 | unsigned int block_group, |
884 | struct buffer_head ** bh); | |
617ba13b MC |
885 | extern int ext4_should_retry_alloc(struct super_block *sb, int *retries); |
886 | extern void ext4_init_block_alloc_info(struct inode *); | |
887 | extern void ext4_rsv_window_add(struct super_block *sb, struct ext4_reserve_window_node *rsv); | |
ac27a0ec DK |
888 | |
889 | /* dir.c */ | |
617ba13b MC |
890 | extern int ext4_check_dir_entry(const char *, struct inode *, |
891 | struct ext4_dir_entry_2 *, | |
ac27a0ec | 892 | struct buffer_head *, unsigned long); |
617ba13b | 893 | extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash, |
ac27a0ec | 894 | __u32 minor_hash, |
617ba13b MC |
895 | struct ext4_dir_entry_2 *dirent); |
896 | extern void ext4_htree_free_dir_info(struct dir_private_info *p); | |
ac27a0ec DK |
897 | |
898 | /* fsync.c */ | |
617ba13b | 899 | extern int ext4_sync_file (struct file *, struct dentry *, int); |
ac27a0ec DK |
900 | |
901 | /* hash.c */ | |
617ba13b | 902 | extern int ext4fs_dirhash(const char *name, int len, struct |
ac27a0ec DK |
903 | dx_hash_info *hinfo); |
904 | ||
905 | /* ialloc.c */ | |
617ba13b MC |
906 | extern struct inode * ext4_new_inode (handle_t *, struct inode *, int); |
907 | extern void ext4_free_inode (handle_t *, struct inode *); | |
908 | extern struct inode * ext4_orphan_get (struct super_block *, unsigned long); | |
909 | extern unsigned long ext4_count_free_inodes (struct super_block *); | |
910 | extern unsigned long ext4_count_dirs (struct super_block *); | |
911 | extern void ext4_check_inodes_bitmap (struct super_block *); | |
912 | extern unsigned long ext4_count_free (struct buffer_head *, unsigned); | |
ac27a0ec DK |
913 | |
914 | ||
915 | /* inode.c */ | |
617ba13b MC |
916 | int ext4_forget(handle_t *handle, int is_metadata, struct inode *inode, |
917 | struct buffer_head *bh, ext4_fsblk_t blocknr); | |
918 | struct buffer_head * ext4_getblk (handle_t *, struct inode *, long, int, int *); | |
919 | struct buffer_head * ext4_bread (handle_t *, struct inode *, int, int, int *); | |
920 | int ext4_get_blocks_handle(handle_t *handle, struct inode *inode, | |
ac27a0ec DK |
921 | sector_t iblock, unsigned long maxblocks, struct buffer_head *bh_result, |
922 | int create, int extend_disksize); | |
923 | ||
617ba13b MC |
924 | extern void ext4_read_inode (struct inode *); |
925 | extern int ext4_write_inode (struct inode *, int); | |
926 | extern int ext4_setattr (struct dentry *, struct iattr *); | |
927 | extern void ext4_delete_inode (struct inode *); | |
928 | extern int ext4_sync_inode (handle_t *, struct inode *); | |
929 | extern void ext4_discard_reservation (struct inode *); | |
930 | extern void ext4_dirty_inode(struct inode *); | |
931 | extern int ext4_change_inode_journal_flag(struct inode *, int); | |
932 | extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *); | |
933 | extern void ext4_truncate (struct inode *); | |
934 | extern void ext4_set_inode_flags(struct inode *); | |
ff9ddf7e | 935 | extern void ext4_get_inode_flags(struct ext4_inode_info *); |
617ba13b | 936 | extern void ext4_set_aops(struct inode *inode); |
a86c6181 AT |
937 | extern int ext4_writepage_trans_blocks(struct inode *); |
938 | extern int ext4_block_truncate_page(handle_t *handle, struct page *page, | |
939 | struct address_space *mapping, loff_t from); | |
ac27a0ec DK |
940 | |
941 | /* ioctl.c */ | |
617ba13b | 942 | extern int ext4_ioctl (struct inode *, struct file *, unsigned int, |
ac27a0ec | 943 | unsigned long); |
617ba13b | 944 | extern long ext4_compat_ioctl (struct file *, unsigned int, unsigned long); |
ac27a0ec DK |
945 | |
946 | /* namei.c */ | |
617ba13b MC |
947 | extern int ext4_orphan_add(handle_t *, struct inode *); |
948 | extern int ext4_orphan_del(handle_t *, struct inode *); | |
949 | extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash, | |
ac27a0ec DK |
950 | __u32 start_minor_hash, __u32 *next_hash); |
951 | ||
952 | /* resize.c */ | |
617ba13b MC |
953 | extern int ext4_group_add(struct super_block *sb, |
954 | struct ext4_new_group_data *input); | |
955 | extern int ext4_group_extend(struct super_block *sb, | |
956 | struct ext4_super_block *es, | |
957 | ext4_fsblk_t n_blocks_count); | |
ac27a0ec DK |
958 | |
959 | /* super.c */ | |
617ba13b | 960 | extern void ext4_error (struct super_block *, const char *, const char *, ...) |
ac27a0ec | 961 | __attribute__ ((format (printf, 3, 4))); |
617ba13b MC |
962 | extern void __ext4_std_error (struct super_block *, const char *, int); |
963 | extern void ext4_abort (struct super_block *, const char *, const char *, ...) | |
ac27a0ec | 964 | __attribute__ ((format (printf, 3, 4))); |
617ba13b | 965 | extern void ext4_warning (struct super_block *, const char *, const char *, ...) |
ac27a0ec | 966 | __attribute__ ((format (printf, 3, 4))); |
617ba13b | 967 | extern void ext4_update_dynamic_rev (struct super_block *sb); |
8fadc143 AR |
968 | extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb, |
969 | struct ext4_group_desc *bg); | |
970 | extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb, | |
971 | struct ext4_group_desc *bg); | |
972 | extern ext4_fsblk_t ext4_inode_table(struct super_block *sb, | |
973 | struct ext4_group_desc *bg); | |
974 | extern void ext4_block_bitmap_set(struct super_block *sb, | |
975 | struct ext4_group_desc *bg, ext4_fsblk_t blk); | |
976 | extern void ext4_inode_bitmap_set(struct super_block *sb, | |
977 | struct ext4_group_desc *bg, ext4_fsblk_t blk); | |
978 | extern void ext4_inode_table_set(struct super_block *sb, | |
979 | struct ext4_group_desc *bg, ext4_fsblk_t blk); | |
bd81d8ee LV |
980 | |
981 | static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es) | |
982 | { | |
983 | return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) | | |
6bc9feff | 984 | le32_to_cpu(es->s_blocks_count_lo); |
bd81d8ee LV |
985 | } |
986 | ||
987 | static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es) | |
988 | { | |
989 | return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) | | |
990 | le32_to_cpu(es->s_r_blocks_count); | |
991 | } | |
992 | ||
993 | static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es) | |
994 | { | |
995 | return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) | | |
996 | le32_to_cpu(es->s_free_blocks_count); | |
997 | } | |
998 | ||
999 | static inline void ext4_blocks_count_set(struct ext4_super_block *es, | |
1000 | ext4_fsblk_t blk) | |
1001 | { | |
6bc9feff | 1002 | es->s_blocks_count_lo = cpu_to_le32((u32)blk); |
bd81d8ee LV |
1003 | es->s_blocks_count_hi = cpu_to_le32(blk >> 32); |
1004 | } | |
1005 | ||
1006 | static inline void ext4_free_blocks_count_set(struct ext4_super_block *es, | |
1007 | ext4_fsblk_t blk) | |
1008 | { | |
1009 | es->s_free_blocks_count = cpu_to_le32((u32)blk); | |
1010 | es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32); | |
1011 | } | |
1012 | ||
1013 | static inline void ext4_r_blocks_count_set(struct ext4_super_block *es, | |
1014 | ext4_fsblk_t blk) | |
1015 | { | |
1016 | es->s_r_blocks_count = cpu_to_le32((u32)blk); | |
1017 | es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32); | |
1018 | } | |
1019 | ||
1020 | ||
ac27a0ec | 1021 | |
617ba13b | 1022 | #define ext4_std_error(sb, errno) \ |
ac27a0ec DK |
1023 | do { \ |
1024 | if ((errno)) \ | |
617ba13b | 1025 | __ext4_std_error((sb), __FUNCTION__, (errno)); \ |
ac27a0ec DK |
1026 | } while (0) |
1027 | ||
1028 | /* | |
1029 | * Inodes and files operations | |
1030 | */ | |
1031 | ||
1032 | /* dir.c */ | |
617ba13b | 1033 | extern const struct file_operations ext4_dir_operations; |
ac27a0ec DK |
1034 | |
1035 | /* file.c */ | |
c5ef1c42 | 1036 | extern const struct inode_operations ext4_file_inode_operations; |
617ba13b | 1037 | extern const struct file_operations ext4_file_operations; |
ac27a0ec DK |
1038 | |
1039 | /* namei.c */ | |
c5ef1c42 AV |
1040 | extern const struct inode_operations ext4_dir_inode_operations; |
1041 | extern const struct inode_operations ext4_special_inode_operations; | |
ac27a0ec DK |
1042 | |
1043 | /* symlink.c */ | |
c5ef1c42 AV |
1044 | extern const struct inode_operations ext4_symlink_inode_operations; |
1045 | extern const struct inode_operations ext4_fast_symlink_inode_operations; | |
ac27a0ec | 1046 | |
a86c6181 AT |
1047 | /* extents.c */ |
1048 | extern int ext4_ext_tree_init(handle_t *handle, struct inode *); | |
1049 | extern int ext4_ext_writepage_trans_blocks(struct inode *, int); | |
1050 | extern int ext4_ext_get_blocks(handle_t *handle, struct inode *inode, | |
1051 | ext4_fsblk_t iblock, | |
1052 | unsigned long max_blocks, struct buffer_head *bh_result, | |
1053 | int create, int extend_disksize); | |
1054 | extern void ext4_ext_truncate(struct inode *, struct page *); | |
1055 | extern void ext4_ext_init(struct super_block *); | |
1056 | extern void ext4_ext_release(struct super_block *); | |
a2df2a63 AA |
1057 | extern long ext4_fallocate(struct inode *inode, int mode, loff_t offset, |
1058 | loff_t len); | |
a86c6181 AT |
1059 | static inline int |
1060 | ext4_get_blocks_wrap(handle_t *handle, struct inode *inode, sector_t block, | |
1061 | unsigned long max_blocks, struct buffer_head *bh, | |
1062 | int create, int extend_disksize) | |
1063 | { | |
1064 | if (EXT4_I(inode)->i_flags & EXT4_EXTENTS_FL) | |
1065 | return ext4_ext_get_blocks(handle, inode, block, max_blocks, | |
1066 | bh, create, extend_disksize); | |
1067 | return ext4_get_blocks_handle(handle, inode, block, max_blocks, bh, | |
1068 | create, extend_disksize); | |
1069 | } | |
1070 | ||
ac27a0ec DK |
1071 | |
1072 | #endif /* __KERNEL__ */ | |
1073 | ||
617ba13b | 1074 | #endif /* _LINUX_EXT4_FS_H */ |