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 | * Always enable hashed directories | |
41 | */ | |
617ba13b | 42 | #define CONFIG_EXT4_INDEX |
ac27a0ec DK |
43 | |
44 | /* | |
45 | * Debug code | |
46 | */ | |
617ba13b MC |
47 | #ifdef EXT4FS_DEBUG |
48 | #define ext4_debug(f, a...) \ | |
ac27a0ec | 49 | do { \ |
617ba13b | 50 | printk (KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \ |
ac27a0ec DK |
51 | __FILE__, __LINE__, __FUNCTION__); \ |
52 | printk (KERN_DEBUG f, ## a); \ | |
53 | } while (0) | |
54 | #else | |
617ba13b | 55 | #define ext4_debug(f, a...) do {} while (0) |
ac27a0ec DK |
56 | #endif |
57 | ||
58 | /* | |
59 | * Special inodes numbers | |
60 | */ | |
617ba13b MC |
61 | #define EXT4_BAD_INO 1 /* Bad blocks inode */ |
62 | #define EXT4_ROOT_INO 2 /* Root inode */ | |
63 | #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */ | |
64 | #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */ | |
65 | #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */ | |
66 | #define EXT4_JOURNAL_INO 8 /* Journal inode */ | |
ac27a0ec | 67 | |
617ba13b MC |
68 | /* First non-reserved inode for old ext4 filesystems */ |
69 | #define EXT4_GOOD_OLD_FIRST_INO 11 | |
ac27a0ec DK |
70 | |
71 | /* | |
72 | * Maximal count of links to a file | |
73 | */ | |
f8628a14 | 74 | #define EXT4_LINK_MAX 65000 |
ac27a0ec DK |
75 | |
76 | /* | |
77 | * Macro-instructions used to manage several block sizes | |
78 | */ | |
617ba13b MC |
79 | #define EXT4_MIN_BLOCK_SIZE 1024 |
80 | #define EXT4_MAX_BLOCK_SIZE 4096 | |
81 | #define EXT4_MIN_BLOCK_LOG_SIZE 10 | |
ac27a0ec | 82 | #ifdef __KERNEL__ |
617ba13b | 83 | # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize) |
ac27a0ec | 84 | #else |
617ba13b | 85 | # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size) |
ac27a0ec | 86 | #endif |
617ba13b | 87 | #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof (__u32)) |
ac27a0ec | 88 | #ifdef __KERNEL__ |
617ba13b | 89 | # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits) |
ac27a0ec | 90 | #else |
617ba13b | 91 | # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10) |
ac27a0ec DK |
92 | #endif |
93 | #ifdef __KERNEL__ | |
617ba13b MC |
94 | #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits) |
95 | #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size) | |
96 | #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino) | |
ac27a0ec | 97 | #else |
617ba13b MC |
98 | #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ |
99 | EXT4_GOOD_OLD_INODE_SIZE : \ | |
ac27a0ec | 100 | (s)->s_inode_size) |
617ba13b MC |
101 | #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ |
102 | EXT4_GOOD_OLD_FIRST_INO : \ | |
ac27a0ec DK |
103 | (s)->s_first_ino) |
104 | #endif | |
a2df2a63 | 105 | #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits))) |
ac27a0ec DK |
106 | |
107 | /* | |
108 | * Macro-instructions used to manage fragments | |
109 | */ | |
617ba13b MC |
110 | #define EXT4_MIN_FRAG_SIZE 1024 |
111 | #define EXT4_MAX_FRAG_SIZE 4096 | |
112 | #define EXT4_MIN_FRAG_LOG_SIZE 10 | |
ac27a0ec | 113 | #ifdef __KERNEL__ |
617ba13b MC |
114 | # define EXT4_FRAG_SIZE(s) (EXT4_SB(s)->s_frag_size) |
115 | # define EXT4_FRAGS_PER_BLOCK(s) (EXT4_SB(s)->s_frags_per_block) | |
ac27a0ec | 116 | #else |
617ba13b MC |
117 | # define EXT4_FRAG_SIZE(s) (EXT4_MIN_FRAG_SIZE << (s)->s_log_frag_size) |
118 | # define EXT4_FRAGS_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_FRAG_SIZE(s)) | |
ac27a0ec DK |
119 | #endif |
120 | ||
121 | /* | |
122 | * Structure of a blocks group descriptor | |
123 | */ | |
617ba13b | 124 | struct ext4_group_desc |
ac27a0ec DK |
125 | { |
126 | __le32 bg_block_bitmap; /* Blocks bitmap block */ | |
127 | __le32 bg_inode_bitmap; /* Inodes bitmap block */ | |
128 | __le32 bg_inode_table; /* Inodes table block */ | |
129 | __le16 bg_free_blocks_count; /* Free blocks count */ | |
130 | __le16 bg_free_inodes_count; /* Free inodes count */ | |
131 | __le16 bg_used_dirs_count; /* Directories count */ | |
bd81d8ee | 132 | __u16 bg_flags; |
8fadc143 AR |
133 | __u32 bg_reserved[3]; |
134 | __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */ | |
135 | __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */ | |
136 | __le32 bg_inode_table_hi; /* Inodes table block MSB */ | |
ac27a0ec DK |
137 | }; |
138 | ||
bd81d8ee LV |
139 | #ifdef __KERNEL__ |
140 | #include <linux/ext4_fs_i.h> | |
141 | #include <linux/ext4_fs_sb.h> | |
142 | #endif | |
ac27a0ec DK |
143 | /* |
144 | * Macro-instructions used to manage group descriptors | |
145 | */ | |
0d1ee42f | 146 | #define EXT4_MIN_DESC_SIZE 32 |
8fadc143 | 147 | #define EXT4_MIN_DESC_SIZE_64BIT 64 |
0d1ee42f AR |
148 | #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE |
149 | #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size) | |
ac27a0ec | 150 | #ifdef __KERNEL__ |
617ba13b MC |
151 | # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group) |
152 | # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block) | |
153 | # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group) | |
154 | # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits) | |
ac27a0ec | 155 | #else |
617ba13b | 156 | # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group) |
0d1ee42f | 157 | # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s)) |
617ba13b | 158 | # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group) |
ac27a0ec DK |
159 | #endif |
160 | ||
161 | /* | |
162 | * Constants relative to the data blocks | |
163 | */ | |
617ba13b MC |
164 | #define EXT4_NDIR_BLOCKS 12 |
165 | #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS | |
166 | #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1) | |
167 | #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1) | |
168 | #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1) | |
ac27a0ec DK |
169 | |
170 | /* | |
171 | * Inode flags | |
172 | */ | |
617ba13b MC |
173 | #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */ |
174 | #define EXT4_UNRM_FL 0x00000002 /* Undelete */ | |
175 | #define EXT4_COMPR_FL 0x00000004 /* Compress file */ | |
176 | #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */ | |
177 | #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */ | |
178 | #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */ | |
179 | #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */ | |
180 | #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */ | |
ac27a0ec | 181 | /* Reserved for compression usage... */ |
617ba13b MC |
182 | #define EXT4_DIRTY_FL 0x00000100 |
183 | #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ | |
184 | #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */ | |
185 | #define EXT4_ECOMPR_FL 0x00000800 /* Compression error */ | |
ac27a0ec | 186 | /* End compression flags --- maybe not all used */ |
617ba13b MC |
187 | #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */ |
188 | #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */ | |
189 | #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */ | |
190 | #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */ | |
191 | #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */ | |
192 | #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/ | |
193 | #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */ | |
a86c6181 | 194 | #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */ |
ac27a0ec | 195 | |
a86c6181 | 196 | #define EXT4_FL_USER_VISIBLE 0x000BDFFF /* User visible flags */ |
617ba13b | 197 | #define EXT4_FL_USER_MODIFIABLE 0x000380FF /* User modifiable flags */ |
ac27a0ec DK |
198 | |
199 | /* | |
200 | * Inode dynamic state flags | |
201 | */ | |
617ba13b MC |
202 | #define EXT4_STATE_JDATA 0x00000001 /* journaled data exists */ |
203 | #define EXT4_STATE_NEW 0x00000002 /* inode is newly created */ | |
204 | #define EXT4_STATE_XATTR 0x00000004 /* has in-inode xattrs */ | |
6dd4ee7c | 205 | #define EXT4_STATE_NO_EXPAND 0x00000008 /* No space for expansion */ |
ac27a0ec DK |
206 | |
207 | /* Used to pass group descriptor data when online resize is done */ | |
617ba13b | 208 | struct ext4_new_group_input { |
8c55e204 DK |
209 | __u32 group; /* Group number for this data */ |
210 | __u64 block_bitmap; /* Absolute block number of block bitmap */ | |
211 | __u64 inode_bitmap; /* Absolute block number of inode bitmap */ | |
212 | __u64 inode_table; /* Absolute block number of inode table start */ | |
213 | __u32 blocks_count; /* Total number of blocks in this group */ | |
214 | __u16 reserved_blocks; /* Number of reserved blocks in this group */ | |
ac27a0ec DK |
215 | __u16 unused; |
216 | }; | |
217 | ||
617ba13b MC |
218 | /* The struct ext4_new_group_input in kernel space, with free_blocks_count */ |
219 | struct ext4_new_group_data { | |
ac27a0ec | 220 | __u32 group; |
bd81d8ee LV |
221 | __u64 block_bitmap; |
222 | __u64 inode_bitmap; | |
223 | __u64 inode_table; | |
ac27a0ec DK |
224 | __u32 blocks_count; |
225 | __u16 reserved_blocks; | |
226 | __u16 unused; | |
227 | __u32 free_blocks_count; | |
228 | }; | |
229 | ||
a2df2a63 AA |
230 | /* |
231 | * Following is used by preallocation code to tell get_blocks() that we | |
232 | * want uninitialzed extents. | |
233 | */ | |
234 | #define EXT4_CREATE_UNINITIALIZED_EXT 2 | |
ac27a0ec DK |
235 | |
236 | /* | |
237 | * ioctl commands | |
238 | */ | |
617ba13b MC |
239 | #define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS |
240 | #define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS | |
241 | #define EXT4_IOC_GETVERSION _IOR('f', 3, long) | |
242 | #define EXT4_IOC_SETVERSION _IOW('f', 4, long) | |
243 | #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long) | |
244 | #define EXT4_IOC_GROUP_ADD _IOW('f', 8,struct ext4_new_group_input) | |
245 | #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION | |
246 | #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION | |
e23291b9 | 247 | #ifdef CONFIG_JBD2_DEBUG |
617ba13b | 248 | #define EXT4_IOC_WAIT_FOR_READONLY _IOR('f', 99, long) |
ac27a0ec | 249 | #endif |
617ba13b MC |
250 | #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long) |
251 | #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long) | |
ac27a0ec DK |
252 | |
253 | /* | |
254 | * ioctl commands in 32 bit emulation | |
255 | */ | |
617ba13b MC |
256 | #define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS |
257 | #define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS | |
258 | #define EXT4_IOC32_GETVERSION _IOR('f', 3, int) | |
259 | #define EXT4_IOC32_SETVERSION _IOW('f', 4, int) | |
260 | #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int) | |
261 | #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int) | |
262 | #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int) | |
e23291b9 | 263 | #ifdef CONFIG_JBD2_DEBUG |
617ba13b | 264 | #define EXT4_IOC32_WAIT_FOR_READONLY _IOR('f', 99, int) |
ac27a0ec | 265 | #endif |
617ba13b MC |
266 | #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION |
267 | #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION | |
ac27a0ec DK |
268 | |
269 | ||
270 | /* | |
271 | * Mount options | |
272 | */ | |
617ba13b | 273 | struct ext4_mount_options { |
ac27a0ec DK |
274 | unsigned long s_mount_opt; |
275 | uid_t s_resuid; | |
276 | gid_t s_resgid; | |
277 | unsigned long s_commit_interval; | |
278 | #ifdef CONFIG_QUOTA | |
279 | int s_jquota_fmt; | |
280 | char *s_qf_names[MAXQUOTAS]; | |
281 | #endif | |
282 | }; | |
283 | ||
284 | /* | |
285 | * Structure of an inode on the disk | |
286 | */ | |
617ba13b | 287 | struct ext4_inode { |
ac27a0ec DK |
288 | __le16 i_mode; /* File mode */ |
289 | __le16 i_uid; /* Low 16 bits of Owner Uid */ | |
290 | __le32 i_size; /* Size in bytes */ | |
291 | __le32 i_atime; /* Access time */ | |
ef7f3835 | 292 | __le32 i_ctime; /* Inode Change time */ |
ac27a0ec DK |
293 | __le32 i_mtime; /* Modification time */ |
294 | __le32 i_dtime; /* Deletion Time */ | |
295 | __le16 i_gid; /* Low 16 bits of Group Id */ | |
296 | __le16 i_links_count; /* Links count */ | |
297 | __le32 i_blocks; /* Blocks count */ | |
298 | __le32 i_flags; /* File flags */ | |
299 | union { | |
300 | struct { | |
301 | __u32 l_i_reserved1; | |
302 | } linux1; | |
303 | struct { | |
304 | __u32 h_i_translator; | |
305 | } hurd1; | |
306 | struct { | |
307 | __u32 m_i_reserved1; | |
308 | } masix1; | |
309 | } osd1; /* OS dependent 1 */ | |
617ba13b | 310 | __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */ |
ac27a0ec DK |
311 | __le32 i_generation; /* File version (for NFS) */ |
312 | __le32 i_file_acl; /* File ACL */ | |
313 | __le32 i_dir_acl; /* Directory ACL */ | |
314 | __le32 i_faddr; /* Fragment address */ | |
315 | union { | |
316 | struct { | |
317 | __u8 l_i_frag; /* Fragment number */ | |
318 | __u8 l_i_fsize; /* Fragment size */ | |
a1ddeb7e | 319 | __le16 l_i_file_acl_high; |
8c55e204 | 320 | __le16 l_i_uid_high; /* these 2 fields */ |
ac27a0ec DK |
321 | __le16 l_i_gid_high; /* were reserved2[0] */ |
322 | __u32 l_i_reserved2; | |
323 | } linux2; | |
324 | struct { | |
325 | __u8 h_i_frag; /* Fragment number */ | |
326 | __u8 h_i_fsize; /* Fragment size */ | |
327 | __u16 h_i_mode_high; | |
328 | __u16 h_i_uid_high; | |
329 | __u16 h_i_gid_high; | |
330 | __u32 h_i_author; | |
331 | } hurd2; | |
332 | struct { | |
333 | __u8 m_i_frag; /* Fragment number */ | |
334 | __u8 m_i_fsize; /* Fragment size */ | |
a1ddeb7e | 335 | __le16 m_i_file_acl_high; |
ac27a0ec DK |
336 | __u32 m_i_reserved2[2]; |
337 | } masix2; | |
338 | } osd2; /* OS dependent 2 */ | |
339 | __le16 i_extra_isize; | |
340 | __le16 i_pad1; | |
ef7f3835 KS |
341 | __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */ |
342 | __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */ | |
343 | __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */ | |
344 | __le32 i_crtime; /* File Creation time */ | |
345 | __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */ | |
ac27a0ec DK |
346 | }; |
347 | ||
348 | #define i_size_high i_dir_acl | |
349 | ||
ef7f3835 KS |
350 | #define EXT4_EPOCH_BITS 2 |
351 | #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1) | |
352 | #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS) | |
353 | ||
354 | /* | |
355 | * Extended fields will fit into an inode if the filesystem was formatted | |
356 | * with large inodes (-I 256 or larger) and there are not currently any EAs | |
357 | * consuming all of the available space. For new inodes we always reserve | |
358 | * enough space for the kernel's known extended fields, but for inodes | |
359 | * created with an old kernel this might not have been the case. None of | |
360 | * the extended inode fields is critical for correct filesystem operation. | |
361 | * This macro checks if a certain field fits in the inode. Note that | |
362 | * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize | |
363 | */ | |
364 | #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \ | |
365 | ((offsetof(typeof(*ext4_inode), field) + \ | |
366 | sizeof((ext4_inode)->field)) \ | |
367 | <= (EXT4_GOOD_OLD_INODE_SIZE + \ | |
368 | (einode)->i_extra_isize)) \ | |
369 | ||
370 | static inline __le32 ext4_encode_extra_time(struct timespec *time) | |
371 | { | |
372 | return cpu_to_le32((sizeof(time->tv_sec) > 4 ? | |
373 | time->tv_sec >> 32 : 0) | | |
374 | ((time->tv_nsec << 2) & EXT4_NSEC_MASK)); | |
375 | } | |
376 | ||
377 | static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra) | |
378 | { | |
379 | if (sizeof(time->tv_sec) > 4) | |
380 | time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) | |
381 | << 32; | |
382 | time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> 2; | |
383 | } | |
384 | ||
385 | #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \ | |
386 | do { \ | |
387 | (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \ | |
388 | if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \ | |
389 | (raw_inode)->xtime ## _extra = \ | |
390 | ext4_encode_extra_time(&(inode)->xtime); \ | |
391 | } while (0) | |
392 | ||
393 | #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \ | |
394 | do { \ | |
395 | if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ | |
396 | (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \ | |
397 | if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ | |
398 | (raw_inode)->xtime ## _extra = \ | |
399 | ext4_encode_extra_time(&(einode)->xtime); \ | |
400 | } while (0) | |
401 | ||
402 | #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \ | |
403 | do { \ | |
404 | (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \ | |
405 | if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \ | |
406 | ext4_decode_extra_time(&(inode)->xtime, \ | |
407 | raw_inode->xtime ## _extra); \ | |
408 | } while (0) | |
409 | ||
410 | #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \ | |
411 | do { \ | |
412 | if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ | |
413 | (einode)->xtime.tv_sec = \ | |
414 | (signed)le32_to_cpu((raw_inode)->xtime); \ | |
415 | if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ | |
416 | ext4_decode_extra_time(&(einode)->xtime, \ | |
417 | raw_inode->xtime ## _extra); \ | |
418 | } while (0) | |
419 | ||
ac27a0ec DK |
420 | #if defined(__KERNEL__) || defined(__linux__) |
421 | #define i_reserved1 osd1.linux1.l_i_reserved1 | |
422 | #define i_frag osd2.linux2.l_i_frag | |
423 | #define i_fsize osd2.linux2.l_i_fsize | |
a1ddeb7e | 424 | #define i_file_acl_high osd2.linux2.l_i_file_acl_high |
ac27a0ec DK |
425 | #define i_uid_low i_uid |
426 | #define i_gid_low i_gid | |
427 | #define i_uid_high osd2.linux2.l_i_uid_high | |
428 | #define i_gid_high osd2.linux2.l_i_gid_high | |
429 | #define i_reserved2 osd2.linux2.l_i_reserved2 | |
430 | ||
431 | #elif defined(__GNU__) | |
432 | ||
433 | #define i_translator osd1.hurd1.h_i_translator | |
434 | #define i_frag osd2.hurd2.h_i_frag; | |
435 | #define i_fsize osd2.hurd2.h_i_fsize; | |
436 | #define i_uid_high osd2.hurd2.h_i_uid_high | |
437 | #define i_gid_high osd2.hurd2.h_i_gid_high | |
438 | #define i_author osd2.hurd2.h_i_author | |
439 | ||
440 | #elif defined(__masix__) | |
441 | ||
442 | #define i_reserved1 osd1.masix1.m_i_reserved1 | |
443 | #define i_frag osd2.masix2.m_i_frag | |
444 | #define i_fsize osd2.masix2.m_i_fsize | |
a1ddeb7e | 445 | #define i_file_acl_high osd2.masix2.m_i_file_acl_high |
ac27a0ec DK |
446 | #define i_reserved2 osd2.masix2.m_i_reserved2 |
447 | ||
448 | #endif /* defined(__KERNEL__) || defined(__linux__) */ | |
449 | ||
450 | /* | |
451 | * File system states | |
452 | */ | |
617ba13b MC |
453 | #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */ |
454 | #define EXT4_ERROR_FS 0x0002 /* Errors detected */ | |
455 | #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */ | |
ac27a0ec DK |
456 | |
457 | /* | |
458 | * Mount flags | |
459 | */ | |
617ba13b MC |
460 | #define EXT4_MOUNT_CHECK 0x00001 /* Do mount-time checks */ |
461 | #define EXT4_MOUNT_OLDALLOC 0x00002 /* Don't use the new Orlov allocator */ | |
462 | #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */ | |
463 | #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */ | |
464 | #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */ | |
465 | #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */ | |
466 | #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */ | |
467 | #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */ | |
468 | #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/ | |
469 | #define EXT4_MOUNT_ABORT 0x00200 /* Fatal error detected */ | |
470 | #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */ | |
471 | #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */ | |
472 | #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */ | |
473 | #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */ | |
474 | #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */ | |
475 | #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */ | |
476 | #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */ | |
477 | #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */ | |
478 | #define EXT4_MOUNT_RESERVATION 0x10000 /* Preallocation */ | |
479 | #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */ | |
480 | #define EXT4_MOUNT_NOBH 0x40000 /* No bufferheads */ | |
481 | #define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */ | |
482 | #define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */ | |
483 | #define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */ | |
a86c6181 | 484 | #define EXT4_MOUNT_EXTENTS 0x400000 /* Extents support */ |
617ba13b MC |
485 | |
486 | /* Compatibility, for having both ext2_fs.h and ext4_fs.h included at once */ | |
ac27a0ec | 487 | #ifndef _LINUX_EXT2_FS_H |
617ba13b MC |
488 | #define clear_opt(o, opt) o &= ~EXT4_MOUNT_##opt |
489 | #define set_opt(o, opt) o |= EXT4_MOUNT_##opt | |
490 | #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \ | |
491 | EXT4_MOUNT_##opt) | |
ac27a0ec | 492 | #else |
617ba13b MC |
493 | #define EXT2_MOUNT_NOLOAD EXT4_MOUNT_NOLOAD |
494 | #define EXT2_MOUNT_ABORT EXT4_MOUNT_ABORT | |
495 | #define EXT2_MOUNT_DATA_FLAGS EXT4_MOUNT_DATA_FLAGS | |
ac27a0ec DK |
496 | #endif |
497 | ||
617ba13b MC |
498 | #define ext4_set_bit ext2_set_bit |
499 | #define ext4_set_bit_atomic ext2_set_bit_atomic | |
500 | #define ext4_clear_bit ext2_clear_bit | |
501 | #define ext4_clear_bit_atomic ext2_clear_bit_atomic | |
502 | #define ext4_test_bit ext2_test_bit | |
503 | #define ext4_find_first_zero_bit ext2_find_first_zero_bit | |
504 | #define ext4_find_next_zero_bit ext2_find_next_zero_bit | |
ac27a0ec DK |
505 | |
506 | /* | |
507 | * Maximal mount counts between two filesystem checks | |
508 | */ | |
617ba13b MC |
509 | #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ |
510 | #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */ | |
ac27a0ec DK |
511 | |
512 | /* | |
513 | * Behaviour when detecting errors | |
514 | */ | |
617ba13b MC |
515 | #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */ |
516 | #define EXT4_ERRORS_RO 2 /* Remount fs read-only */ | |
517 | #define EXT4_ERRORS_PANIC 3 /* Panic */ | |
518 | #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE | |
ac27a0ec DK |
519 | |
520 | /* | |
521 | * Structure of the super block | |
522 | */ | |
617ba13b | 523 | struct ext4_super_block { |
ac27a0ec DK |
524 | /*00*/ __le32 s_inodes_count; /* Inodes count */ |
525 | __le32 s_blocks_count; /* Blocks count */ | |
526 | __le32 s_r_blocks_count; /* Reserved blocks count */ | |
527 | __le32 s_free_blocks_count; /* Free blocks count */ | |
528 | /*10*/ __le32 s_free_inodes_count; /* Free inodes count */ | |
529 | __le32 s_first_data_block; /* First Data Block */ | |
530 | __le32 s_log_block_size; /* Block size */ | |
531 | __le32 s_log_frag_size; /* Fragment size */ | |
532 | /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */ | |
533 | __le32 s_frags_per_group; /* # Fragments per group */ | |
534 | __le32 s_inodes_per_group; /* # Inodes per group */ | |
535 | __le32 s_mtime; /* Mount time */ | |
536 | /*30*/ __le32 s_wtime; /* Write time */ | |
537 | __le16 s_mnt_count; /* Mount count */ | |
538 | __le16 s_max_mnt_count; /* Maximal mount count */ | |
539 | __le16 s_magic; /* Magic signature */ | |
540 | __le16 s_state; /* File system state */ | |
541 | __le16 s_errors; /* Behaviour when detecting errors */ | |
542 | __le16 s_minor_rev_level; /* minor revision level */ | |
543 | /*40*/ __le32 s_lastcheck; /* time of last check */ | |
544 | __le32 s_checkinterval; /* max. time between checks */ | |
545 | __le32 s_creator_os; /* OS */ | |
546 | __le32 s_rev_level; /* Revision level */ | |
547 | /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */ | |
548 | __le16 s_def_resgid; /* Default gid for reserved blocks */ | |
549 | /* | |
617ba13b | 550 | * These fields are for EXT4_DYNAMIC_REV superblocks only. |
ac27a0ec DK |
551 | * |
552 | * Note: the difference between the compatible feature set and | |
553 | * the incompatible feature set is that if there is a bit set | |
554 | * in the incompatible feature set that the kernel doesn't | |
555 | * know about, it should refuse to mount the filesystem. | |
556 | * | |
557 | * e2fsck's requirements are more strict; if it doesn't know | |
558 | * about a feature in either the compatible or incompatible | |
559 | * feature set, it must abort and not try to meddle with | |
560 | * things it doesn't understand... | |
561 | */ | |
562 | __le32 s_first_ino; /* First non-reserved inode */ | |
0d1ee42f | 563 | __le16 s_inode_size; /* size of inode structure */ |
ac27a0ec DK |
564 | __le16 s_block_group_nr; /* block group # of this superblock */ |
565 | __le32 s_feature_compat; /* compatible feature set */ | |
566 | /*60*/ __le32 s_feature_incompat; /* incompatible feature set */ | |
567 | __le32 s_feature_ro_compat; /* readonly-compatible feature set */ | |
568 | /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */ | |
569 | /*78*/ char s_volume_name[16]; /* volume name */ | |
570 | /*88*/ char s_last_mounted[64]; /* directory where last mounted */ | |
571 | /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */ | |
572 | /* | |
573 | * Performance hints. Directory preallocation should only | |
617ba13b | 574 | * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on. |
ac27a0ec DK |
575 | */ |
576 | __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ | |
577 | __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ | |
578 | __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */ | |
579 | /* | |
617ba13b | 580 | * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set. |
ac27a0ec DK |
581 | */ |
582 | /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */ | |
583 | /*E0*/ __le32 s_journal_inum; /* inode number of journal file */ | |
584 | __le32 s_journal_dev; /* device number of journal file */ | |
585 | __le32 s_last_orphan; /* start of list of inodes to delete */ | |
586 | __le32 s_hash_seed[4]; /* HTREE hash seed */ | |
587 | __u8 s_def_hash_version; /* Default hash version to use */ | |
588 | __u8 s_reserved_char_pad; | |
0d1ee42f | 589 | __le16 s_desc_size; /* size of group descriptor */ |
bd81d8ee | 590 | /*100*/ __le32 s_default_mount_opts; |
ac27a0ec | 591 | __le32 s_first_meta_bg; /* First metablock block group */ |
bd81d8ee LV |
592 | __le32 s_mkfs_time; /* When the filesystem was created */ |
593 | __le32 s_jnl_blocks[17]; /* Backup of the journal inode */ | |
594 | /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */ | |
595 | /*150*/ __le32 s_blocks_count_hi; /* Blocks count */ | |
596 | __le32 s_r_blocks_count_hi; /* Reserved blocks count */ | |
597 | __le32 s_free_blocks_count_hi; /* Free blocks count */ | |
436bd75e TT |
598 | __u16 s_min_extra_isize; /* All inodes have at least # bytes */ |
599 | __u16 s_want_extra_isize; /* New inodes should reserve # bytes */ | |
600 | __u32 s_flags; /* Miscellaneous flags */ | |
601 | __u16 s_raid_stride; /* RAID stride */ | |
602 | __u16 s_mmp_interval; /* # seconds to wait in MMP checking */ | |
603 | __u64 s_mmp_block; /* Block for multi-mount protection */ | |
604 | __u32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/ | |
605 | __u32 s_reserved[163]; /* Padding to the end of the block */ | |
ac27a0ec DK |
606 | }; |
607 | ||
608 | #ifdef __KERNEL__ | |
617ba13b | 609 | static inline struct ext4_sb_info * EXT4_SB(struct super_block *sb) |
ac27a0ec DK |
610 | { |
611 | return sb->s_fs_info; | |
612 | } | |
617ba13b | 613 | static inline struct ext4_inode_info *EXT4_I(struct inode *inode) |
ac27a0ec | 614 | { |
617ba13b | 615 | return container_of(inode, struct ext4_inode_info, vfs_inode); |
ac27a0ec DK |
616 | } |
617 | ||
ef7f3835 KS |
618 | static inline struct timespec ext4_current_time(struct inode *inode) |
619 | { | |
620 | return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ? | |
621 | current_fs_time(inode->i_sb) : CURRENT_TIME_SEC; | |
622 | } | |
623 | ||
624 | ||
617ba13b | 625 | static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino) |
ac27a0ec | 626 | { |
617ba13b MC |
627 | return ino == EXT4_ROOT_INO || |
628 | ino == EXT4_JOURNAL_INO || | |
629 | ino == EXT4_RESIZE_INO || | |
630 | (ino >= EXT4_FIRST_INO(sb) && | |
631 | ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count)); | |
ac27a0ec DK |
632 | } |
633 | #else | |
617ba13b | 634 | /* Assume that user mode programs are passing in an ext4fs superblock, not |
ac27a0ec DK |
635 | * a kernel struct super_block. This will allow us to call the feature-test |
636 | * macros from user land. */ | |
617ba13b | 637 | #define EXT4_SB(sb) (sb) |
ac27a0ec DK |
638 | #endif |
639 | ||
617ba13b | 640 | #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime |
ac27a0ec DK |
641 | |
642 | /* | |
643 | * Codes for operating systems | |
644 | */ | |
617ba13b MC |
645 | #define EXT4_OS_LINUX 0 |
646 | #define EXT4_OS_HURD 1 | |
647 | #define EXT4_OS_MASIX 2 | |
648 | #define EXT4_OS_FREEBSD 3 | |
649 | #define EXT4_OS_LITES 4 | |
ac27a0ec DK |
650 | |
651 | /* | |
652 | * Revision levels | |
653 | */ | |
617ba13b MC |
654 | #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */ |
655 | #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ | |
ac27a0ec | 656 | |
617ba13b MC |
657 | #define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV |
658 | #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV | |
ac27a0ec | 659 | |
617ba13b | 660 | #define EXT4_GOOD_OLD_INODE_SIZE 128 |
ac27a0ec DK |
661 | |
662 | /* | |
663 | * Feature set definitions | |
664 | */ | |
665 | ||
617ba13b MC |
666 | #define EXT4_HAS_COMPAT_FEATURE(sb,mask) \ |
667 | ( EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask) ) | |
668 | #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \ | |
669 | ( EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask) ) | |
670 | #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \ | |
671 | ( EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask) ) | |
672 | #define EXT4_SET_COMPAT_FEATURE(sb,mask) \ | |
673 | EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask) | |
674 | #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \ | |
675 | EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask) | |
676 | #define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \ | |
677 | EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask) | |
678 | #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \ | |
679 | EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask) | |
680 | #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \ | |
681 | EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask) | |
682 | #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \ | |
683 | EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask) | |
684 | ||
685 | #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001 | |
686 | #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002 | |
687 | #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004 | |
688 | #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008 | |
689 | #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010 | |
690 | #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020 | |
691 | ||
692 | #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 | |
693 | #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 | |
694 | #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 | |
f8628a14 | 695 | #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020 |
ef7f3835 | 696 | #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040 |
617ba13b MC |
697 | |
698 | #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001 | |
699 | #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002 | |
700 | #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */ | |
701 | #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */ | |
702 | #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010 | |
a86c6181 | 703 | #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */ |
bd81d8ee | 704 | #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080 |
617ba13b MC |
705 | |
706 | #define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR | |
707 | #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ | |
708 | EXT4_FEATURE_INCOMPAT_RECOVER| \ | |
a86c6181 | 709 | EXT4_FEATURE_INCOMPAT_META_BG| \ |
bd81d8ee LV |
710 | EXT4_FEATURE_INCOMPAT_EXTENTS| \ |
711 | EXT4_FEATURE_INCOMPAT_64BIT) | |
617ba13b MC |
712 | #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ |
713 | EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ | |
f8628a14 | 714 | EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \ |
ef7f3835 | 715 | EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \ |
617ba13b | 716 | EXT4_FEATURE_RO_COMPAT_BTREE_DIR) |
ac27a0ec DK |
717 | |
718 | /* | |
719 | * Default values for user and/or group using reserved blocks | |
720 | */ | |
617ba13b MC |
721 | #define EXT4_DEF_RESUID 0 |
722 | #define EXT4_DEF_RESGID 0 | |
ac27a0ec DK |
723 | |
724 | /* | |
725 | * Default mount options | |
726 | */ | |
617ba13b MC |
727 | #define EXT4_DEFM_DEBUG 0x0001 |
728 | #define EXT4_DEFM_BSDGROUPS 0x0002 | |
729 | #define EXT4_DEFM_XATTR_USER 0x0004 | |
730 | #define EXT4_DEFM_ACL 0x0008 | |
731 | #define EXT4_DEFM_UID16 0x0010 | |
732 | #define EXT4_DEFM_JMODE 0x0060 | |
733 | #define EXT4_DEFM_JMODE_DATA 0x0020 | |
734 | #define EXT4_DEFM_JMODE_ORDERED 0x0040 | |
735 | #define EXT4_DEFM_JMODE_WBACK 0x0060 | |
ac27a0ec DK |
736 | |
737 | /* | |
738 | * Structure of a directory entry | |
739 | */ | |
617ba13b | 740 | #define EXT4_NAME_LEN 255 |
ac27a0ec | 741 | |
617ba13b | 742 | struct ext4_dir_entry { |
ac27a0ec DK |
743 | __le32 inode; /* Inode number */ |
744 | __le16 rec_len; /* Directory entry length */ | |
745 | __le16 name_len; /* Name length */ | |
617ba13b | 746 | char name[EXT4_NAME_LEN]; /* File name */ |
ac27a0ec DK |
747 | }; |
748 | ||
749 | /* | |
617ba13b | 750 | * The new version of the directory entry. Since EXT4 structures are |
ac27a0ec DK |
751 | * stored in intel byte order, and the name_len field could never be |
752 | * bigger than 255 chars, it's safe to reclaim the extra byte for the | |
753 | * file_type field. | |
754 | */ | |
617ba13b | 755 | struct ext4_dir_entry_2 { |
ac27a0ec DK |
756 | __le32 inode; /* Inode number */ |
757 | __le16 rec_len; /* Directory entry length */ | |
758 | __u8 name_len; /* Name length */ | |
759 | __u8 file_type; | |
617ba13b | 760 | char name[EXT4_NAME_LEN]; /* File name */ |
ac27a0ec DK |
761 | }; |
762 | ||
763 | /* | |
617ba13b | 764 | * Ext4 directory file types. Only the low 3 bits are used. The |
ac27a0ec DK |
765 | * other bits are reserved for now. |
766 | */ | |
617ba13b MC |
767 | #define EXT4_FT_UNKNOWN 0 |
768 | #define EXT4_FT_REG_FILE 1 | |
769 | #define EXT4_FT_DIR 2 | |
770 | #define EXT4_FT_CHRDEV 3 | |
771 | #define EXT4_FT_BLKDEV 4 | |
772 | #define EXT4_FT_FIFO 5 | |
773 | #define EXT4_FT_SOCK 6 | |
774 | #define EXT4_FT_SYMLINK 7 | |
ac27a0ec | 775 | |
617ba13b | 776 | #define EXT4_FT_MAX 8 |
ac27a0ec DK |
777 | |
778 | /* | |
617ba13b | 779 | * EXT4_DIR_PAD defines the directory entries boundaries |
ac27a0ec DK |
780 | * |
781 | * NOTE: It must be a multiple of 4 | |
782 | */ | |
617ba13b MC |
783 | #define EXT4_DIR_PAD 4 |
784 | #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1) | |
785 | #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \ | |
786 | ~EXT4_DIR_ROUND) | |
ac27a0ec DK |
787 | /* |
788 | * Hash Tree Directory indexing | |
789 | * (c) Daniel Phillips, 2001 | |
790 | */ | |
791 | ||
617ba13b MC |
792 | #ifdef CONFIG_EXT4_INDEX |
793 | #define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \ | |
794 | EXT4_FEATURE_COMPAT_DIR_INDEX) && \ | |
795 | (EXT4_I(dir)->i_flags & EXT4_INDEX_FL)) | |
796 | #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX) | |
797 | #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1) | |
ac27a0ec DK |
798 | #else |
799 | #define is_dx(dir) 0 | |
617ba13b MC |
800 | #define EXT4_DIR_LINK_MAX(dir) ((dir)->i_nlink >= EXT4_LINK_MAX) |
801 | #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2) | |
ac27a0ec DK |
802 | #endif |
803 | ||
804 | /* Legal values for the dx_root hash_version field: */ | |
805 | ||
806 | #define DX_HASH_LEGACY 0 | |
807 | #define DX_HASH_HALF_MD4 1 | |
808 | #define DX_HASH_TEA 2 | |
809 | ||
810 | #ifdef __KERNEL__ | |
811 | ||
812 | /* hash info structure used by the directory hash */ | |
813 | struct dx_hash_info | |
814 | { | |
815 | u32 hash; | |
816 | u32 minor_hash; | |
817 | int hash_version; | |
818 | u32 *seed; | |
819 | }; | |
820 | ||
617ba13b | 821 | #define EXT4_HTREE_EOF 0x7fffffff |
ac27a0ec DK |
822 | |
823 | /* | |
617ba13b | 824 | * Control parameters used by ext4_htree_next_block |
ac27a0ec DK |
825 | */ |
826 | #define HASH_NB_ALWAYS 1 | |
827 | ||
828 | ||
829 | /* | |
830 | * Describe an inode's exact location on disk and in memory | |
831 | */ | |
617ba13b | 832 | struct ext4_iloc |
ac27a0ec DK |
833 | { |
834 | struct buffer_head *bh; | |
835 | unsigned long offset; | |
836 | unsigned long block_group; | |
837 | }; | |
838 | ||
617ba13b | 839 | static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc) |
ac27a0ec | 840 | { |
617ba13b | 841 | return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset); |
ac27a0ec DK |
842 | } |
843 | ||
844 | /* | |
845 | * This structure is stuffed into the struct file's private_data field | |
846 | * for directories. It is where we put information so that we can do | |
847 | * readdir operations in hash tree order. | |
848 | */ | |
849 | struct dir_private_info { | |
850 | struct rb_root root; | |
851 | struct rb_node *curr_node; | |
852 | struct fname *extra_fname; | |
853 | loff_t last_pos; | |
854 | __u32 curr_hash; | |
855 | __u32 curr_minor_hash; | |
856 | __u32 next_hash; | |
857 | }; | |
858 | ||
859 | /* calculate the first block number of the group */ | |
617ba13b MC |
860 | static inline ext4_fsblk_t |
861 | ext4_group_first_block_no(struct super_block *sb, unsigned long group_no) | |
ac27a0ec | 862 | { |
617ba13b MC |
863 | return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) + |
864 | le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block); | |
ac27a0ec DK |
865 | } |
866 | ||
867 | /* | |
868 | * Special error return code only used by dx_probe() and its callers. | |
869 | */ | |
870 | #define ERR_BAD_DX_DIR -75000 | |
871 | ||
72b64b59 AM |
872 | void ext4_get_group_no_and_offset(struct super_block *sb, ext4_fsblk_t blocknr, |
873 | unsigned long *blockgrpp, ext4_grpblk_t *offsetp); | |
3a5b2ecd | 874 | |
ac27a0ec DK |
875 | /* |
876 | * Function prototypes | |
877 | */ | |
878 | ||
879 | /* | |
880 | * Ok, these declarations are also in <linux/kernel.h> but none of the | |
617ba13b | 881 | * ext4 source programs needs to include it so they are duplicated here. |
ac27a0ec | 882 | */ |
8c55e204 DK |
883 | # define NORET_TYPE /**/ |
884 | # define ATTRIB_NORET __attribute__((noreturn)) | |
885 | # define NORET_AND noreturn, | |
ac27a0ec DK |
886 | |
887 | /* balloc.c */ | |
3a5b2ecd MC |
888 | extern unsigned int ext4_block_group(struct super_block *sb, |
889 | ext4_fsblk_t blocknr); | |
890 | extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb, | |
891 | ext4_fsblk_t blocknr); | |
617ba13b MC |
892 | extern int ext4_bg_has_super(struct super_block *sb, int group); |
893 | extern unsigned long ext4_bg_num_gdb(struct super_block *sb, int group); | |
894 | extern ext4_fsblk_t ext4_new_block (handle_t *handle, struct inode *inode, | |
895 | ext4_fsblk_t goal, int *errp); | |
896 | extern ext4_fsblk_t ext4_new_blocks (handle_t *handle, struct inode *inode, | |
897 | ext4_fsblk_t goal, unsigned long *count, int *errp); | |
898 | extern void ext4_free_blocks (handle_t *handle, struct inode *inode, | |
899 | ext4_fsblk_t block, unsigned long count); | |
900 | extern void ext4_free_blocks_sb (handle_t *handle, struct super_block *sb, | |
901 | ext4_fsblk_t block, unsigned long count, | |
ac27a0ec | 902 | unsigned long *pdquot_freed_blocks); |
617ba13b MC |
903 | extern ext4_fsblk_t ext4_count_free_blocks (struct super_block *); |
904 | extern void ext4_check_blocks_bitmap (struct super_block *); | |
905 | extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb, | |
ac27a0ec DK |
906 | unsigned int block_group, |
907 | struct buffer_head ** bh); | |
617ba13b MC |
908 | extern int ext4_should_retry_alloc(struct super_block *sb, int *retries); |
909 | extern void ext4_init_block_alloc_info(struct inode *); | |
910 | extern void ext4_rsv_window_add(struct super_block *sb, struct ext4_reserve_window_node *rsv); | |
ac27a0ec DK |
911 | |
912 | /* dir.c */ | |
617ba13b MC |
913 | extern int ext4_check_dir_entry(const char *, struct inode *, |
914 | struct ext4_dir_entry_2 *, | |
ac27a0ec | 915 | struct buffer_head *, unsigned long); |
617ba13b | 916 | extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash, |
ac27a0ec | 917 | __u32 minor_hash, |
617ba13b MC |
918 | struct ext4_dir_entry_2 *dirent); |
919 | extern void ext4_htree_free_dir_info(struct dir_private_info *p); | |
ac27a0ec DK |
920 | |
921 | /* fsync.c */ | |
617ba13b | 922 | extern int ext4_sync_file (struct file *, struct dentry *, int); |
ac27a0ec DK |
923 | |
924 | /* hash.c */ | |
617ba13b | 925 | extern int ext4fs_dirhash(const char *name, int len, struct |
ac27a0ec DK |
926 | dx_hash_info *hinfo); |
927 | ||
928 | /* ialloc.c */ | |
617ba13b MC |
929 | extern struct inode * ext4_new_inode (handle_t *, struct inode *, int); |
930 | extern void ext4_free_inode (handle_t *, struct inode *); | |
931 | extern struct inode * ext4_orphan_get (struct super_block *, unsigned long); | |
932 | extern unsigned long ext4_count_free_inodes (struct super_block *); | |
933 | extern unsigned long ext4_count_dirs (struct super_block *); | |
934 | extern void ext4_check_inodes_bitmap (struct super_block *); | |
935 | extern unsigned long ext4_count_free (struct buffer_head *, unsigned); | |
ac27a0ec DK |
936 | |
937 | ||
938 | /* inode.c */ | |
617ba13b MC |
939 | int ext4_forget(handle_t *handle, int is_metadata, struct inode *inode, |
940 | struct buffer_head *bh, ext4_fsblk_t blocknr); | |
941 | struct buffer_head * ext4_getblk (handle_t *, struct inode *, long, int, int *); | |
942 | struct buffer_head * ext4_bread (handle_t *, struct inode *, int, int, int *); | |
943 | int ext4_get_blocks_handle(handle_t *handle, struct inode *inode, | |
ac27a0ec DK |
944 | sector_t iblock, unsigned long maxblocks, struct buffer_head *bh_result, |
945 | int create, int extend_disksize); | |
946 | ||
617ba13b MC |
947 | extern void ext4_read_inode (struct inode *); |
948 | extern int ext4_write_inode (struct inode *, int); | |
949 | extern int ext4_setattr (struct dentry *, struct iattr *); | |
950 | extern void ext4_delete_inode (struct inode *); | |
951 | extern int ext4_sync_inode (handle_t *, struct inode *); | |
952 | extern void ext4_discard_reservation (struct inode *); | |
953 | extern void ext4_dirty_inode(struct inode *); | |
954 | extern int ext4_change_inode_journal_flag(struct inode *, int); | |
955 | extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *); | |
956 | extern void ext4_truncate (struct inode *); | |
957 | extern void ext4_set_inode_flags(struct inode *); | |
ff9ddf7e | 958 | extern void ext4_get_inode_flags(struct ext4_inode_info *); |
617ba13b | 959 | extern void ext4_set_aops(struct inode *inode); |
a86c6181 AT |
960 | extern int ext4_writepage_trans_blocks(struct inode *); |
961 | extern int ext4_block_truncate_page(handle_t *handle, struct page *page, | |
962 | struct address_space *mapping, loff_t from); | |
ac27a0ec DK |
963 | |
964 | /* ioctl.c */ | |
617ba13b | 965 | extern int ext4_ioctl (struct inode *, struct file *, unsigned int, |
ac27a0ec | 966 | unsigned long); |
617ba13b | 967 | extern long ext4_compat_ioctl (struct file *, unsigned int, unsigned long); |
ac27a0ec DK |
968 | |
969 | /* namei.c */ | |
617ba13b MC |
970 | extern int ext4_orphan_add(handle_t *, struct inode *); |
971 | extern int ext4_orphan_del(handle_t *, struct inode *); | |
972 | extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash, | |
ac27a0ec DK |
973 | __u32 start_minor_hash, __u32 *next_hash); |
974 | ||
975 | /* resize.c */ | |
617ba13b MC |
976 | extern int ext4_group_add(struct super_block *sb, |
977 | struct ext4_new_group_data *input); | |
978 | extern int ext4_group_extend(struct super_block *sb, | |
979 | struct ext4_super_block *es, | |
980 | ext4_fsblk_t n_blocks_count); | |
ac27a0ec DK |
981 | |
982 | /* super.c */ | |
617ba13b | 983 | extern void ext4_error (struct super_block *, const char *, const char *, ...) |
ac27a0ec | 984 | __attribute__ ((format (printf, 3, 4))); |
617ba13b MC |
985 | extern void __ext4_std_error (struct super_block *, const char *, int); |
986 | extern void ext4_abort (struct super_block *, const char *, const char *, ...) | |
ac27a0ec | 987 | __attribute__ ((format (printf, 3, 4))); |
617ba13b | 988 | extern void ext4_warning (struct super_block *, const char *, const char *, ...) |
ac27a0ec | 989 | __attribute__ ((format (printf, 3, 4))); |
617ba13b | 990 | extern void ext4_update_dynamic_rev (struct super_block *sb); |
8fadc143 AR |
991 | extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb, |
992 | struct ext4_group_desc *bg); | |
993 | extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb, | |
994 | struct ext4_group_desc *bg); | |
995 | extern ext4_fsblk_t ext4_inode_table(struct super_block *sb, | |
996 | struct ext4_group_desc *bg); | |
997 | extern void ext4_block_bitmap_set(struct super_block *sb, | |
998 | struct ext4_group_desc *bg, ext4_fsblk_t blk); | |
999 | extern void ext4_inode_bitmap_set(struct super_block *sb, | |
1000 | struct ext4_group_desc *bg, ext4_fsblk_t blk); | |
1001 | extern void ext4_inode_table_set(struct super_block *sb, | |
1002 | struct ext4_group_desc *bg, ext4_fsblk_t blk); | |
bd81d8ee LV |
1003 | |
1004 | static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es) | |
1005 | { | |
1006 | return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) | | |
1007 | le32_to_cpu(es->s_blocks_count); | |
1008 | } | |
1009 | ||
1010 | static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es) | |
1011 | { | |
1012 | return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) | | |
1013 | le32_to_cpu(es->s_r_blocks_count); | |
1014 | } | |
1015 | ||
1016 | static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es) | |
1017 | { | |
1018 | return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) | | |
1019 | le32_to_cpu(es->s_free_blocks_count); | |
1020 | } | |
1021 | ||
1022 | static inline void ext4_blocks_count_set(struct ext4_super_block *es, | |
1023 | ext4_fsblk_t blk) | |
1024 | { | |
1025 | es->s_blocks_count = cpu_to_le32((u32)blk); | |
1026 | es->s_blocks_count_hi = cpu_to_le32(blk >> 32); | |
1027 | } | |
1028 | ||
1029 | static inline void ext4_free_blocks_count_set(struct ext4_super_block *es, | |
1030 | ext4_fsblk_t blk) | |
1031 | { | |
1032 | es->s_free_blocks_count = cpu_to_le32((u32)blk); | |
1033 | es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32); | |
1034 | } | |
1035 | ||
1036 | static inline void ext4_r_blocks_count_set(struct ext4_super_block *es, | |
1037 | ext4_fsblk_t blk) | |
1038 | { | |
1039 | es->s_r_blocks_count = cpu_to_le32((u32)blk); | |
1040 | es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32); | |
1041 | } | |
1042 | ||
1043 | ||
ac27a0ec | 1044 | |
617ba13b | 1045 | #define ext4_std_error(sb, errno) \ |
ac27a0ec DK |
1046 | do { \ |
1047 | if ((errno)) \ | |
617ba13b | 1048 | __ext4_std_error((sb), __FUNCTION__, (errno)); \ |
ac27a0ec DK |
1049 | } while (0) |
1050 | ||
1051 | /* | |
1052 | * Inodes and files operations | |
1053 | */ | |
1054 | ||
1055 | /* dir.c */ | |
617ba13b | 1056 | extern const struct file_operations ext4_dir_operations; |
ac27a0ec DK |
1057 | |
1058 | /* file.c */ | |
c5ef1c42 | 1059 | extern const struct inode_operations ext4_file_inode_operations; |
617ba13b | 1060 | extern const struct file_operations ext4_file_operations; |
ac27a0ec DK |
1061 | |
1062 | /* namei.c */ | |
c5ef1c42 AV |
1063 | extern const struct inode_operations ext4_dir_inode_operations; |
1064 | extern const struct inode_operations ext4_special_inode_operations; | |
ac27a0ec DK |
1065 | |
1066 | /* symlink.c */ | |
c5ef1c42 AV |
1067 | extern const struct inode_operations ext4_symlink_inode_operations; |
1068 | extern const struct inode_operations ext4_fast_symlink_inode_operations; | |
ac27a0ec | 1069 | |
a86c6181 AT |
1070 | /* extents.c */ |
1071 | extern int ext4_ext_tree_init(handle_t *handle, struct inode *); | |
1072 | extern int ext4_ext_writepage_trans_blocks(struct inode *, int); | |
1073 | extern int ext4_ext_get_blocks(handle_t *handle, struct inode *inode, | |
1074 | ext4_fsblk_t iblock, | |
1075 | unsigned long max_blocks, struct buffer_head *bh_result, | |
1076 | int create, int extend_disksize); | |
1077 | extern void ext4_ext_truncate(struct inode *, struct page *); | |
1078 | extern void ext4_ext_init(struct super_block *); | |
1079 | extern void ext4_ext_release(struct super_block *); | |
a2df2a63 AA |
1080 | extern long ext4_fallocate(struct inode *inode, int mode, loff_t offset, |
1081 | loff_t len); | |
a86c6181 AT |
1082 | static inline int |
1083 | ext4_get_blocks_wrap(handle_t *handle, struct inode *inode, sector_t block, | |
1084 | unsigned long max_blocks, struct buffer_head *bh, | |
1085 | int create, int extend_disksize) | |
1086 | { | |
1087 | if (EXT4_I(inode)->i_flags & EXT4_EXTENTS_FL) | |
1088 | return ext4_ext_get_blocks(handle, inode, block, max_blocks, | |
1089 | bh, create, extend_disksize); | |
1090 | return ext4_get_blocks_handle(handle, inode, block, max_blocks, bh, | |
1091 | create, extend_disksize); | |
1092 | } | |
1093 | ||
ac27a0ec DK |
1094 | |
1095 | #endif /* __KERNEL__ */ | |
1096 | ||
617ba13b | 1097 | #endif /* _LINUX_EXT4_FS_H */ |