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1 | /* | |
2 | * ext4.h | |
3 | * | |
4 | * Copyright (C) 1992, 1993, 1994, 1995 | |
5 | * Remy Card (card@masi.ibp.fr) | |
6 | * Laboratoire MASI - Institut Blaise Pascal | |
7 | * Universite Pierre et Marie Curie (Paris VI) | |
8 | * | |
9 | * from | |
10 | * | |
11 | * linux/include/linux/minix_fs.h | |
12 | * | |
13 | * Copyright (C) 1991, 1992 Linus Torvalds | |
14 | */ | |
15 | ||
16 | #ifndef _EXT4_H | |
17 | #define _EXT4_H | |
18 | ||
19 | #include <linux/types.h> | |
20 | #include <linux/blkdev.h> | |
21 | #include <linux/magic.h> | |
22 | #include <linux/jbd2.h> | |
23 | #include <linux/quota.h> | |
24 | #include "ext4_i.h" | |
25 | ||
26 | /* | |
27 | * The fourth extended filesystem constants/structures | |
28 | */ | |
29 | ||
30 | /* | |
31 | * Define EXT4FS_DEBUG to produce debug messages | |
32 | */ | |
33 | #undef EXT4FS_DEBUG | |
34 | ||
35 | /* | |
36 | * Debug code | |
37 | */ | |
38 | #ifdef EXT4FS_DEBUG | |
39 | #define ext4_debug(f, a...) \ | |
40 | do { \ | |
41 | printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \ | |
42 | __FILE__, __LINE__, __func__); \ | |
43 | printk(KERN_DEBUG f, ## a); \ | |
44 | } while (0) | |
45 | #else | |
46 | #define ext4_debug(f, a...) do {} while (0) | |
47 | #endif | |
48 | ||
49 | /* prefer goal again. length */ | |
50 | #define EXT4_MB_HINT_MERGE 1 | |
51 | /* blocks already reserved */ | |
52 | #define EXT4_MB_HINT_RESERVED 2 | |
53 | /* metadata is being allocated */ | |
54 | #define EXT4_MB_HINT_METADATA 4 | |
55 | /* first blocks in the file */ | |
56 | #define EXT4_MB_HINT_FIRST 8 | |
57 | /* search for the best chunk */ | |
58 | #define EXT4_MB_HINT_BEST 16 | |
59 | /* data is being allocated */ | |
60 | #define EXT4_MB_HINT_DATA 32 | |
61 | /* don't preallocate (for tails) */ | |
62 | #define EXT4_MB_HINT_NOPREALLOC 64 | |
63 | /* allocate for locality group */ | |
64 | #define EXT4_MB_HINT_GROUP_ALLOC 128 | |
65 | /* allocate goal blocks or none */ | |
66 | #define EXT4_MB_HINT_GOAL_ONLY 256 | |
67 | /* goal is meaningful */ | |
68 | #define EXT4_MB_HINT_TRY_GOAL 512 | |
69 | /* blocks already pre-reserved by delayed allocation */ | |
70 | #define EXT4_MB_DELALLOC_RESERVED 1024 | |
71 | ||
72 | ||
73 | struct ext4_allocation_request { | |
74 | /* target inode for block we're allocating */ | |
75 | struct inode *inode; | |
76 | /* logical block in target inode */ | |
77 | ext4_lblk_t logical; | |
78 | /* phys. target (a hint) */ | |
79 | ext4_fsblk_t goal; | |
80 | /* the closest logical allocated block to the left */ | |
81 | ext4_lblk_t lleft; | |
82 | /* phys. block for ^^^ */ | |
83 | ext4_fsblk_t pleft; | |
84 | /* the closest logical allocated block to the right */ | |
85 | ext4_lblk_t lright; | |
86 | /* phys. block for ^^^ */ | |
87 | ext4_fsblk_t pright; | |
88 | /* how many blocks we want to allocate */ | |
89 | unsigned int len; | |
90 | /* flags. see above EXT4_MB_HINT_* */ | |
91 | unsigned int flags; | |
92 | }; | |
93 | ||
94 | /* | |
95 | * Special inodes numbers | |
96 | */ | |
97 | #define EXT4_BAD_INO 1 /* Bad blocks inode */ | |
98 | #define EXT4_ROOT_INO 2 /* Root inode */ | |
99 | #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */ | |
100 | #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */ | |
101 | #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */ | |
102 | #define EXT4_JOURNAL_INO 8 /* Journal inode */ | |
103 | ||
104 | /* First non-reserved inode for old ext4 filesystems */ | |
105 | #define EXT4_GOOD_OLD_FIRST_INO 11 | |
106 | ||
107 | /* | |
108 | * Maximal count of links to a file | |
109 | */ | |
110 | #define EXT4_LINK_MAX 65000 | |
111 | ||
112 | /* | |
113 | * Macro-instructions used to manage several block sizes | |
114 | */ | |
115 | #define EXT4_MIN_BLOCK_SIZE 1024 | |
116 | #define EXT4_MAX_BLOCK_SIZE 65536 | |
117 | #define EXT4_MIN_BLOCK_LOG_SIZE 10 | |
118 | #ifdef __KERNEL__ | |
119 | # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize) | |
120 | #else | |
121 | # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size) | |
122 | #endif | |
123 | #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32)) | |
124 | #ifdef __KERNEL__ | |
125 | # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits) | |
126 | #else | |
127 | # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10) | |
128 | #endif | |
129 | #ifdef __KERNEL__ | |
130 | #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits) | |
131 | #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size) | |
132 | #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino) | |
133 | #else | |
134 | #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ | |
135 | EXT4_GOOD_OLD_INODE_SIZE : \ | |
136 | (s)->s_inode_size) | |
137 | #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ | |
138 | EXT4_GOOD_OLD_FIRST_INO : \ | |
139 | (s)->s_first_ino) | |
140 | #endif | |
141 | #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits))) | |
142 | ||
143 | /* | |
144 | * Structure of a blocks group descriptor | |
145 | */ | |
146 | struct ext4_group_desc | |
147 | { | |
148 | __le32 bg_block_bitmap_lo; /* Blocks bitmap block */ | |
149 | __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */ | |
150 | __le32 bg_inode_table_lo; /* Inodes table block */ | |
151 | __le16 bg_free_blocks_count_lo;/* Free blocks count */ | |
152 | __le16 bg_free_inodes_count_lo;/* Free inodes count */ | |
153 | __le16 bg_used_dirs_count_lo; /* Directories count */ | |
154 | __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */ | |
155 | __u32 bg_reserved[2]; /* Likely block/inode bitmap checksum */ | |
156 | __le16 bg_itable_unused_lo; /* Unused inodes count */ | |
157 | __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */ | |
158 | __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */ | |
159 | __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */ | |
160 | __le32 bg_inode_table_hi; /* Inodes table block MSB */ | |
161 | __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */ | |
162 | __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */ | |
163 | __le16 bg_used_dirs_count_hi; /* Directories count MSB */ | |
164 | __le16 bg_itable_unused_hi; /* Unused inodes count MSB */ | |
165 | __u32 bg_reserved2[3]; | |
166 | }; | |
167 | ||
168 | /* | |
169 | * Structure of a flex block group info | |
170 | */ | |
171 | ||
172 | struct flex_groups { | |
173 | __u32 free_inodes; | |
174 | __u32 free_blocks; | |
175 | }; | |
176 | ||
177 | #define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */ | |
178 | #define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */ | |
179 | #define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */ | |
180 | ||
181 | #ifdef __KERNEL__ | |
182 | #include "ext4_sb.h" | |
183 | #endif | |
184 | /* | |
185 | * Macro-instructions used to manage group descriptors | |
186 | */ | |
187 | #define EXT4_MIN_DESC_SIZE 32 | |
188 | #define EXT4_MIN_DESC_SIZE_64BIT 64 | |
189 | #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE | |
190 | #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size) | |
191 | #ifdef __KERNEL__ | |
192 | # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group) | |
193 | # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block) | |
194 | # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group) | |
195 | # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits) | |
196 | #else | |
197 | # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group) | |
198 | # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s)) | |
199 | # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group) | |
200 | #endif | |
201 | ||
202 | /* | |
203 | * Constants relative to the data blocks | |
204 | */ | |
205 | #define EXT4_NDIR_BLOCKS 12 | |
206 | #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS | |
207 | #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1) | |
208 | #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1) | |
209 | #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1) | |
210 | ||
211 | /* | |
212 | * Inode flags | |
213 | */ | |
214 | #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */ | |
215 | #define EXT4_UNRM_FL 0x00000002 /* Undelete */ | |
216 | #define EXT4_COMPR_FL 0x00000004 /* Compress file */ | |
217 | #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */ | |
218 | #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */ | |
219 | #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */ | |
220 | #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */ | |
221 | #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */ | |
222 | /* Reserved for compression usage... */ | |
223 | #define EXT4_DIRTY_FL 0x00000100 | |
224 | #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ | |
225 | #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */ | |
226 | #define EXT4_ECOMPR_FL 0x00000800 /* Compression error */ | |
227 | /* End compression flags --- maybe not all used */ | |
228 | #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */ | |
229 | #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */ | |
230 | #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */ | |
231 | #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */ | |
232 | #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */ | |
233 | #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/ | |
234 | #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */ | |
235 | #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */ | |
236 | #define EXT4_EXT_MIGRATE 0x00100000 /* Inode is migrating */ | |
237 | #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */ | |
238 | ||
239 | #define EXT4_FL_USER_VISIBLE 0x000BDFFF /* User visible flags */ | |
240 | #define EXT4_FL_USER_MODIFIABLE 0x000B80FF /* User modifiable flags */ | |
241 | ||
242 | /* | |
243 | * Inode dynamic state flags | |
244 | */ | |
245 | #define EXT4_STATE_JDATA 0x00000001 /* journaled data exists */ | |
246 | #define EXT4_STATE_NEW 0x00000002 /* inode is newly created */ | |
247 | #define EXT4_STATE_XATTR 0x00000004 /* has in-inode xattrs */ | |
248 | #define EXT4_STATE_NO_EXPAND 0x00000008 /* No space for expansion */ | |
249 | ||
250 | /* Used to pass group descriptor data when online resize is done */ | |
251 | struct ext4_new_group_input { | |
252 | __u32 group; /* Group number for this data */ | |
253 | __u64 block_bitmap; /* Absolute block number of block bitmap */ | |
254 | __u64 inode_bitmap; /* Absolute block number of inode bitmap */ | |
255 | __u64 inode_table; /* Absolute block number of inode table start */ | |
256 | __u32 blocks_count; /* Total number of blocks in this group */ | |
257 | __u16 reserved_blocks; /* Number of reserved blocks in this group */ | |
258 | __u16 unused; | |
259 | }; | |
260 | ||
261 | /* The struct ext4_new_group_input in kernel space, with free_blocks_count */ | |
262 | struct ext4_new_group_data { | |
263 | __u32 group; | |
264 | __u64 block_bitmap; | |
265 | __u64 inode_bitmap; | |
266 | __u64 inode_table; | |
267 | __u32 blocks_count; | |
268 | __u16 reserved_blocks; | |
269 | __u16 unused; | |
270 | __u32 free_blocks_count; | |
271 | }; | |
272 | ||
273 | /* | |
274 | * Following is used by preallocation code to tell get_blocks() that we | |
275 | * want uninitialzed extents. | |
276 | */ | |
277 | #define EXT4_CREATE_UNINITIALIZED_EXT 2 | |
278 | ||
279 | /* | |
280 | * ioctl commands | |
281 | */ | |
282 | #define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS | |
283 | #define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS | |
284 | #define EXT4_IOC_GETVERSION _IOR('f', 3, long) | |
285 | #define EXT4_IOC_SETVERSION _IOW('f', 4, long) | |
286 | #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION | |
287 | #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION | |
288 | #ifdef CONFIG_JBD2_DEBUG | |
289 | #define EXT4_IOC_WAIT_FOR_READONLY _IOR('f', 99, long) | |
290 | #endif | |
291 | #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long) | |
292 | #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long) | |
293 | #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long) | |
294 | #define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input) | |
295 | #define EXT4_IOC_MIGRATE _IO('f', 9) | |
296 | /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */ | |
297 | ||
298 | /* | |
299 | * ioctl commands in 32 bit emulation | |
300 | */ | |
301 | #define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS | |
302 | #define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS | |
303 | #define EXT4_IOC32_GETVERSION _IOR('f', 3, int) | |
304 | #define EXT4_IOC32_SETVERSION _IOW('f', 4, int) | |
305 | #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int) | |
306 | #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int) | |
307 | #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int) | |
308 | #ifdef CONFIG_JBD2_DEBUG | |
309 | #define EXT4_IOC32_WAIT_FOR_READONLY _IOR('f', 99, int) | |
310 | #endif | |
311 | #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION | |
312 | #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION | |
313 | ||
314 | ||
315 | /* | |
316 | * Mount options | |
317 | */ | |
318 | struct ext4_mount_options { | |
319 | unsigned long s_mount_opt; | |
320 | uid_t s_resuid; | |
321 | gid_t s_resgid; | |
322 | unsigned long s_commit_interval; | |
323 | u32 s_min_batch_time, s_max_batch_time; | |
324 | #ifdef CONFIG_QUOTA | |
325 | int s_jquota_fmt; | |
326 | char *s_qf_names[MAXQUOTAS]; | |
327 | #endif | |
328 | }; | |
329 | ||
330 | /* | |
331 | * Structure of an inode on the disk | |
332 | */ | |
333 | struct ext4_inode { | |
334 | __le16 i_mode; /* File mode */ | |
335 | __le16 i_uid; /* Low 16 bits of Owner Uid */ | |
336 | __le32 i_size_lo; /* Size in bytes */ | |
337 | __le32 i_atime; /* Access time */ | |
338 | __le32 i_ctime; /* Inode Change time */ | |
339 | __le32 i_mtime; /* Modification time */ | |
340 | __le32 i_dtime; /* Deletion Time */ | |
341 | __le16 i_gid; /* Low 16 bits of Group Id */ | |
342 | __le16 i_links_count; /* Links count */ | |
343 | __le32 i_blocks_lo; /* Blocks count */ | |
344 | __le32 i_flags; /* File flags */ | |
345 | union { | |
346 | struct { | |
347 | __le32 l_i_version; | |
348 | } linux1; | |
349 | struct { | |
350 | __u32 h_i_translator; | |
351 | } hurd1; | |
352 | struct { | |
353 | __u32 m_i_reserved1; | |
354 | } masix1; | |
355 | } osd1; /* OS dependent 1 */ | |
356 | __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */ | |
357 | __le32 i_generation; /* File version (for NFS) */ | |
358 | __le32 i_file_acl_lo; /* File ACL */ | |
359 | __le32 i_size_high; | |
360 | __le32 i_obso_faddr; /* Obsoleted fragment address */ | |
361 | union { | |
362 | struct { | |
363 | __le16 l_i_blocks_high; /* were l_i_reserved1 */ | |
364 | __le16 l_i_file_acl_high; | |
365 | __le16 l_i_uid_high; /* these 2 fields */ | |
366 | __le16 l_i_gid_high; /* were reserved2[0] */ | |
367 | __u32 l_i_reserved2; | |
368 | } linux2; | |
369 | struct { | |
370 | __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ | |
371 | __u16 h_i_mode_high; | |
372 | __u16 h_i_uid_high; | |
373 | __u16 h_i_gid_high; | |
374 | __u32 h_i_author; | |
375 | } hurd2; | |
376 | struct { | |
377 | __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ | |
378 | __le16 m_i_file_acl_high; | |
379 | __u32 m_i_reserved2[2]; | |
380 | } masix2; | |
381 | } osd2; /* OS dependent 2 */ | |
382 | __le16 i_extra_isize; | |
383 | __le16 i_pad1; | |
384 | __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */ | |
385 | __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */ | |
386 | __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */ | |
387 | __le32 i_crtime; /* File Creation time */ | |
388 | __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */ | |
389 | __le32 i_version_hi; /* high 32 bits for 64-bit version */ | |
390 | }; | |
391 | ||
392 | ||
393 | #define EXT4_EPOCH_BITS 2 | |
394 | #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1) | |
395 | #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS) | |
396 | ||
397 | /* | |
398 | * Extended fields will fit into an inode if the filesystem was formatted | |
399 | * with large inodes (-I 256 or larger) and there are not currently any EAs | |
400 | * consuming all of the available space. For new inodes we always reserve | |
401 | * enough space for the kernel's known extended fields, but for inodes | |
402 | * created with an old kernel this might not have been the case. None of | |
403 | * the extended inode fields is critical for correct filesystem operation. | |
404 | * This macro checks if a certain field fits in the inode. Note that | |
405 | * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize | |
406 | */ | |
407 | #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \ | |
408 | ((offsetof(typeof(*ext4_inode), field) + \ | |
409 | sizeof((ext4_inode)->field)) \ | |
410 | <= (EXT4_GOOD_OLD_INODE_SIZE + \ | |
411 | (einode)->i_extra_isize)) \ | |
412 | ||
413 | static inline __le32 ext4_encode_extra_time(struct timespec *time) | |
414 | { | |
415 | return cpu_to_le32((sizeof(time->tv_sec) > 4 ? | |
416 | time->tv_sec >> 32 : 0) | | |
417 | ((time->tv_nsec << 2) & EXT4_NSEC_MASK)); | |
418 | } | |
419 | ||
420 | static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra) | |
421 | { | |
422 | if (sizeof(time->tv_sec) > 4) | |
423 | time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) | |
424 | << 32; | |
425 | time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> 2; | |
426 | } | |
427 | ||
428 | #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \ | |
429 | do { \ | |
430 | (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \ | |
431 | if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \ | |
432 | (raw_inode)->xtime ## _extra = \ | |
433 | ext4_encode_extra_time(&(inode)->xtime); \ | |
434 | } while (0) | |
435 | ||
436 | #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \ | |
437 | do { \ | |
438 | if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ | |
439 | (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \ | |
440 | if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ | |
441 | (raw_inode)->xtime ## _extra = \ | |
442 | ext4_encode_extra_time(&(einode)->xtime); \ | |
443 | } while (0) | |
444 | ||
445 | #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \ | |
446 | do { \ | |
447 | (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \ | |
448 | if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \ | |
449 | ext4_decode_extra_time(&(inode)->xtime, \ | |
450 | raw_inode->xtime ## _extra); \ | |
451 | } while (0) | |
452 | ||
453 | #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \ | |
454 | do { \ | |
455 | if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ | |
456 | (einode)->xtime.tv_sec = \ | |
457 | (signed)le32_to_cpu((raw_inode)->xtime); \ | |
458 | if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ | |
459 | ext4_decode_extra_time(&(einode)->xtime, \ | |
460 | raw_inode->xtime ## _extra); \ | |
461 | } while (0) | |
462 | ||
463 | #define i_disk_version osd1.linux1.l_i_version | |
464 | ||
465 | #if defined(__KERNEL__) || defined(__linux__) | |
466 | #define i_reserved1 osd1.linux1.l_i_reserved1 | |
467 | #define i_file_acl_high osd2.linux2.l_i_file_acl_high | |
468 | #define i_blocks_high osd2.linux2.l_i_blocks_high | |
469 | #define i_uid_low i_uid | |
470 | #define i_gid_low i_gid | |
471 | #define i_uid_high osd2.linux2.l_i_uid_high | |
472 | #define i_gid_high osd2.linux2.l_i_gid_high | |
473 | #define i_reserved2 osd2.linux2.l_i_reserved2 | |
474 | ||
475 | #elif defined(__GNU__) | |
476 | ||
477 | #define i_translator osd1.hurd1.h_i_translator | |
478 | #define i_uid_high osd2.hurd2.h_i_uid_high | |
479 | #define i_gid_high osd2.hurd2.h_i_gid_high | |
480 | #define i_author osd2.hurd2.h_i_author | |
481 | ||
482 | #elif defined(__masix__) | |
483 | ||
484 | #define i_reserved1 osd1.masix1.m_i_reserved1 | |
485 | #define i_file_acl_high osd2.masix2.m_i_file_acl_high | |
486 | #define i_reserved2 osd2.masix2.m_i_reserved2 | |
487 | ||
488 | #endif /* defined(__KERNEL__) || defined(__linux__) */ | |
489 | ||
490 | /* | |
491 | * File system states | |
492 | */ | |
493 | #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */ | |
494 | #define EXT4_ERROR_FS 0x0002 /* Errors detected */ | |
495 | #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */ | |
496 | ||
497 | /* | |
498 | * Misc. filesystem flags | |
499 | */ | |
500 | #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */ | |
501 | #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */ | |
502 | #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */ | |
503 | ||
504 | /* | |
505 | * Mount flags | |
506 | */ | |
507 | #define EXT4_MOUNT_OLDALLOC 0x00002 /* Don't use the new Orlov allocator */ | |
508 | #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */ | |
509 | #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */ | |
510 | #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */ | |
511 | #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */ | |
512 | #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */ | |
513 | #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */ | |
514 | #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/ | |
515 | #define EXT4_MOUNT_ABORT 0x00200 /* Fatal error detected */ | |
516 | #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */ | |
517 | #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */ | |
518 | #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */ | |
519 | #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */ | |
520 | #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */ | |
521 | #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */ | |
522 | #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */ | |
523 | #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */ | |
524 | #define EXT4_MOUNT_RESERVATION 0x10000 /* Preallocation */ | |
525 | #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */ | |
526 | #define EXT4_MOUNT_NOBH 0x40000 /* No bufferheads */ | |
527 | #define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */ | |
528 | #define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */ | |
529 | #define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */ | |
530 | #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */ | |
531 | #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */ | |
532 | #define EXT4_MOUNT_I_VERSION 0x2000000 /* i_version support */ | |
533 | #define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */ | |
534 | #define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */ | |
535 | ||
536 | /* Compatibility, for having both ext2_fs.h and ext4_fs.h included at once */ | |
537 | #ifndef _LINUX_EXT2_FS_H | |
538 | #define clear_opt(o, opt) o &= ~EXT4_MOUNT_##opt | |
539 | #define set_opt(o, opt) o |= EXT4_MOUNT_##opt | |
540 | #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \ | |
541 | EXT4_MOUNT_##opt) | |
542 | #else | |
543 | #define EXT2_MOUNT_NOLOAD EXT4_MOUNT_NOLOAD | |
544 | #define EXT2_MOUNT_ABORT EXT4_MOUNT_ABORT | |
545 | #define EXT2_MOUNT_DATA_FLAGS EXT4_MOUNT_DATA_FLAGS | |
546 | #endif | |
547 | ||
548 | #define ext4_set_bit ext2_set_bit | |
549 | #define ext4_set_bit_atomic ext2_set_bit_atomic | |
550 | #define ext4_clear_bit ext2_clear_bit | |
551 | #define ext4_clear_bit_atomic ext2_clear_bit_atomic | |
552 | #define ext4_test_bit ext2_test_bit | |
553 | #define ext4_find_first_zero_bit ext2_find_first_zero_bit | |
554 | #define ext4_find_next_zero_bit ext2_find_next_zero_bit | |
555 | #define ext4_find_next_bit ext2_find_next_bit | |
556 | ||
557 | /* | |
558 | * Maximal mount counts between two filesystem checks | |
559 | */ | |
560 | #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ | |
561 | #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */ | |
562 | ||
563 | /* | |
564 | * Behaviour when detecting errors | |
565 | */ | |
566 | #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */ | |
567 | #define EXT4_ERRORS_RO 2 /* Remount fs read-only */ | |
568 | #define EXT4_ERRORS_PANIC 3 /* Panic */ | |
569 | #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE | |
570 | ||
571 | /* | |
572 | * Structure of the super block | |
573 | */ | |
574 | struct ext4_super_block { | |
575 | /*00*/ __le32 s_inodes_count; /* Inodes count */ | |
576 | __le32 s_blocks_count_lo; /* Blocks count */ | |
577 | __le32 s_r_blocks_count_lo; /* Reserved blocks count */ | |
578 | __le32 s_free_blocks_count_lo; /* Free blocks count */ | |
579 | /*10*/ __le32 s_free_inodes_count; /* Free inodes count */ | |
580 | __le32 s_first_data_block; /* First Data Block */ | |
581 | __le32 s_log_block_size; /* Block size */ | |
582 | __le32 s_obso_log_frag_size; /* Obsoleted fragment size */ | |
583 | /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */ | |
584 | __le32 s_obso_frags_per_group; /* Obsoleted fragments per group */ | |
585 | __le32 s_inodes_per_group; /* # Inodes per group */ | |
586 | __le32 s_mtime; /* Mount time */ | |
587 | /*30*/ __le32 s_wtime; /* Write time */ | |
588 | __le16 s_mnt_count; /* Mount count */ | |
589 | __le16 s_max_mnt_count; /* Maximal mount count */ | |
590 | __le16 s_magic; /* Magic signature */ | |
591 | __le16 s_state; /* File system state */ | |
592 | __le16 s_errors; /* Behaviour when detecting errors */ | |
593 | __le16 s_minor_rev_level; /* minor revision level */ | |
594 | /*40*/ __le32 s_lastcheck; /* time of last check */ | |
595 | __le32 s_checkinterval; /* max. time between checks */ | |
596 | __le32 s_creator_os; /* OS */ | |
597 | __le32 s_rev_level; /* Revision level */ | |
598 | /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */ | |
599 | __le16 s_def_resgid; /* Default gid for reserved blocks */ | |
600 | /* | |
601 | * These fields are for EXT4_DYNAMIC_REV superblocks only. | |
602 | * | |
603 | * Note: the difference between the compatible feature set and | |
604 | * the incompatible feature set is that if there is a bit set | |
605 | * in the incompatible feature set that the kernel doesn't | |
606 | * know about, it should refuse to mount the filesystem. | |
607 | * | |
608 | * e2fsck's requirements are more strict; if it doesn't know | |
609 | * about a feature in either the compatible or incompatible | |
610 | * feature set, it must abort and not try to meddle with | |
611 | * things it doesn't understand... | |
612 | */ | |
613 | __le32 s_first_ino; /* First non-reserved inode */ | |
614 | __le16 s_inode_size; /* size of inode structure */ | |
615 | __le16 s_block_group_nr; /* block group # of this superblock */ | |
616 | __le32 s_feature_compat; /* compatible feature set */ | |
617 | /*60*/ __le32 s_feature_incompat; /* incompatible feature set */ | |
618 | __le32 s_feature_ro_compat; /* readonly-compatible feature set */ | |
619 | /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */ | |
620 | /*78*/ char s_volume_name[16]; /* volume name */ | |
621 | /*88*/ char s_last_mounted[64]; /* directory where last mounted */ | |
622 | /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */ | |
623 | /* | |
624 | * Performance hints. Directory preallocation should only | |
625 | * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on. | |
626 | */ | |
627 | __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ | |
628 | __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ | |
629 | __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */ | |
630 | /* | |
631 | * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set. | |
632 | */ | |
633 | /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */ | |
634 | /*E0*/ __le32 s_journal_inum; /* inode number of journal file */ | |
635 | __le32 s_journal_dev; /* device number of journal file */ | |
636 | __le32 s_last_orphan; /* start of list of inodes to delete */ | |
637 | __le32 s_hash_seed[4]; /* HTREE hash seed */ | |
638 | __u8 s_def_hash_version; /* Default hash version to use */ | |
639 | __u8 s_reserved_char_pad; | |
640 | __le16 s_desc_size; /* size of group descriptor */ | |
641 | /*100*/ __le32 s_default_mount_opts; | |
642 | __le32 s_first_meta_bg; /* First metablock block group */ | |
643 | __le32 s_mkfs_time; /* When the filesystem was created */ | |
644 | __le32 s_jnl_blocks[17]; /* Backup of the journal inode */ | |
645 | /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */ | |
646 | /*150*/ __le32 s_blocks_count_hi; /* Blocks count */ | |
647 | __le32 s_r_blocks_count_hi; /* Reserved blocks count */ | |
648 | __le32 s_free_blocks_count_hi; /* Free blocks count */ | |
649 | __le16 s_min_extra_isize; /* All inodes have at least # bytes */ | |
650 | __le16 s_want_extra_isize; /* New inodes should reserve # bytes */ | |
651 | __le32 s_flags; /* Miscellaneous flags */ | |
652 | __le16 s_raid_stride; /* RAID stride */ | |
653 | __le16 s_mmp_interval; /* # seconds to wait in MMP checking */ | |
654 | __le64 s_mmp_block; /* Block for multi-mount protection */ | |
655 | __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/ | |
656 | __u8 s_log_groups_per_flex; /* FLEX_BG group size */ | |
657 | __u8 s_reserved_char_pad2; | |
658 | __le16 s_reserved_pad; | |
659 | __u32 s_reserved[162]; /* Padding to the end of the block */ | |
660 | }; | |
661 | ||
662 | #ifdef __KERNEL__ | |
663 | static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb) | |
664 | { | |
665 | return sb->s_fs_info; | |
666 | } | |
667 | static inline struct ext4_inode_info *EXT4_I(struct inode *inode) | |
668 | { | |
669 | return container_of(inode, struct ext4_inode_info, vfs_inode); | |
670 | } | |
671 | ||
672 | static inline struct timespec ext4_current_time(struct inode *inode) | |
673 | { | |
674 | return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ? | |
675 | current_fs_time(inode->i_sb) : CURRENT_TIME_SEC; | |
676 | } | |
677 | ||
678 | ||
679 | static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino) | |
680 | { | |
681 | return ino == EXT4_ROOT_INO || | |
682 | ino == EXT4_JOURNAL_INO || | |
683 | ino == EXT4_RESIZE_INO || | |
684 | (ino >= EXT4_FIRST_INO(sb) && | |
685 | ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count)); | |
686 | } | |
687 | #else | |
688 | /* Assume that user mode programs are passing in an ext4fs superblock, not | |
689 | * a kernel struct super_block. This will allow us to call the feature-test | |
690 | * macros from user land. */ | |
691 | #define EXT4_SB(sb) (sb) | |
692 | #endif | |
693 | ||
694 | #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime | |
695 | ||
696 | /* | |
697 | * Codes for operating systems | |
698 | */ | |
699 | #define EXT4_OS_LINUX 0 | |
700 | #define EXT4_OS_HURD 1 | |
701 | #define EXT4_OS_MASIX 2 | |
702 | #define EXT4_OS_FREEBSD 3 | |
703 | #define EXT4_OS_LITES 4 | |
704 | ||
705 | /* | |
706 | * Revision levels | |
707 | */ | |
708 | #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */ | |
709 | #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ | |
710 | ||
711 | #define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV | |
712 | #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV | |
713 | ||
714 | #define EXT4_GOOD_OLD_INODE_SIZE 128 | |
715 | ||
716 | /* | |
717 | * Feature set definitions | |
718 | */ | |
719 | ||
720 | #define EXT4_HAS_COMPAT_FEATURE(sb,mask) \ | |
721 | ((EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask)) != 0) | |
722 | #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \ | |
723 | ((EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask)) != 0) | |
724 | #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \ | |
725 | ((EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask)) != 0) | |
726 | #define EXT4_SET_COMPAT_FEATURE(sb,mask) \ | |
727 | EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask) | |
728 | #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \ | |
729 | EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask) | |
730 | #define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \ | |
731 | EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask) | |
732 | #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \ | |
733 | EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask) | |
734 | #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \ | |
735 | EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask) | |
736 | #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \ | |
737 | EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask) | |
738 | ||
739 | #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001 | |
740 | #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002 | |
741 | #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004 | |
742 | #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008 | |
743 | #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010 | |
744 | #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020 | |
745 | ||
746 | #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 | |
747 | #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 | |
748 | #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 | |
749 | #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008 | |
750 | #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010 | |
751 | #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020 | |
752 | #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040 | |
753 | ||
754 | #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001 | |
755 | #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002 | |
756 | #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */ | |
757 | #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */ | |
758 | #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010 | |
759 | #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */ | |
760 | #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080 | |
761 | #define EXT4_FEATURE_INCOMPAT_MMP 0x0100 | |
762 | #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200 | |
763 | ||
764 | #define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR | |
765 | #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ | |
766 | EXT4_FEATURE_INCOMPAT_RECOVER| \ | |
767 | EXT4_FEATURE_INCOMPAT_META_BG| \ | |
768 | EXT4_FEATURE_INCOMPAT_EXTENTS| \ | |
769 | EXT4_FEATURE_INCOMPAT_64BIT| \ | |
770 | EXT4_FEATURE_INCOMPAT_FLEX_BG) | |
771 | #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ | |
772 | EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ | |
773 | EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \ | |
774 | EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \ | |
775 | EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \ | |
776 | EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\ | |
777 | EXT4_FEATURE_RO_COMPAT_HUGE_FILE) | |
778 | ||
779 | /* | |
780 | * Default values for user and/or group using reserved blocks | |
781 | */ | |
782 | #define EXT4_DEF_RESUID 0 | |
783 | #define EXT4_DEF_RESGID 0 | |
784 | ||
785 | #define EXT4_DEF_INODE_READAHEAD_BLKS 32 | |
786 | ||
787 | /* | |
788 | * Default mount options | |
789 | */ | |
790 | #define EXT4_DEFM_DEBUG 0x0001 | |
791 | #define EXT4_DEFM_BSDGROUPS 0x0002 | |
792 | #define EXT4_DEFM_XATTR_USER 0x0004 | |
793 | #define EXT4_DEFM_ACL 0x0008 | |
794 | #define EXT4_DEFM_UID16 0x0010 | |
795 | #define EXT4_DEFM_JMODE 0x0060 | |
796 | #define EXT4_DEFM_JMODE_DATA 0x0020 | |
797 | #define EXT4_DEFM_JMODE_ORDERED 0x0040 | |
798 | #define EXT4_DEFM_JMODE_WBACK 0x0060 | |
799 | ||
800 | /* | |
801 | * Default journal batch times | |
802 | */ | |
803 | #define EXT4_DEF_MIN_BATCH_TIME 0 | |
804 | #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */ | |
805 | ||
806 | /* | |
807 | * Structure of a directory entry | |
808 | */ | |
809 | #define EXT4_NAME_LEN 255 | |
810 | ||
811 | struct ext4_dir_entry { | |
812 | __le32 inode; /* Inode number */ | |
813 | __le16 rec_len; /* Directory entry length */ | |
814 | __le16 name_len; /* Name length */ | |
815 | char name[EXT4_NAME_LEN]; /* File name */ | |
816 | }; | |
817 | ||
818 | /* | |
819 | * The new version of the directory entry. Since EXT4 structures are | |
820 | * stored in intel byte order, and the name_len field could never be | |
821 | * bigger than 255 chars, it's safe to reclaim the extra byte for the | |
822 | * file_type field. | |
823 | */ | |
824 | struct ext4_dir_entry_2 { | |
825 | __le32 inode; /* Inode number */ | |
826 | __le16 rec_len; /* Directory entry length */ | |
827 | __u8 name_len; /* Name length */ | |
828 | __u8 file_type; | |
829 | char name[EXT4_NAME_LEN]; /* File name */ | |
830 | }; | |
831 | ||
832 | /* | |
833 | * Ext4 directory file types. Only the low 3 bits are used. The | |
834 | * other bits are reserved for now. | |
835 | */ | |
836 | #define EXT4_FT_UNKNOWN 0 | |
837 | #define EXT4_FT_REG_FILE 1 | |
838 | #define EXT4_FT_DIR 2 | |
839 | #define EXT4_FT_CHRDEV 3 | |
840 | #define EXT4_FT_BLKDEV 4 | |
841 | #define EXT4_FT_FIFO 5 | |
842 | #define EXT4_FT_SOCK 6 | |
843 | #define EXT4_FT_SYMLINK 7 | |
844 | ||
845 | #define EXT4_FT_MAX 8 | |
846 | ||
847 | /* | |
848 | * EXT4_DIR_PAD defines the directory entries boundaries | |
849 | * | |
850 | * NOTE: It must be a multiple of 4 | |
851 | */ | |
852 | #define EXT4_DIR_PAD 4 | |
853 | #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1) | |
854 | #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \ | |
855 | ~EXT4_DIR_ROUND) | |
856 | #define EXT4_MAX_REC_LEN ((1<<16)-1) | |
857 | ||
858 | static inline unsigned ext4_rec_len_from_disk(__le16 dlen) | |
859 | { | |
860 | unsigned len = le16_to_cpu(dlen); | |
861 | ||
862 | if (len == EXT4_MAX_REC_LEN || len == 0) | |
863 | return 1 << 16; | |
864 | return len; | |
865 | } | |
866 | ||
867 | static inline __le16 ext4_rec_len_to_disk(unsigned len) | |
868 | { | |
869 | if (len == (1 << 16)) | |
870 | return cpu_to_le16(EXT4_MAX_REC_LEN); | |
871 | else if (len > (1 << 16)) | |
872 | BUG(); | |
873 | return cpu_to_le16(len); | |
874 | } | |
875 | ||
876 | /* | |
877 | * Hash Tree Directory indexing | |
878 | * (c) Daniel Phillips, 2001 | |
879 | */ | |
880 | ||
881 | #define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \ | |
882 | EXT4_FEATURE_COMPAT_DIR_INDEX) && \ | |
883 | (EXT4_I(dir)->i_flags & EXT4_INDEX_FL)) | |
884 | #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX) | |
885 | #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1) | |
886 | ||
887 | /* Legal values for the dx_root hash_version field: */ | |
888 | ||
889 | #define DX_HASH_LEGACY 0 | |
890 | #define DX_HASH_HALF_MD4 1 | |
891 | #define DX_HASH_TEA 2 | |
892 | #define DX_HASH_LEGACY_UNSIGNED 3 | |
893 | #define DX_HASH_HALF_MD4_UNSIGNED 4 | |
894 | #define DX_HASH_TEA_UNSIGNED 5 | |
895 | ||
896 | #ifdef __KERNEL__ | |
897 | ||
898 | /* hash info structure used by the directory hash */ | |
899 | struct dx_hash_info | |
900 | { | |
901 | u32 hash; | |
902 | u32 minor_hash; | |
903 | int hash_version; | |
904 | u32 *seed; | |
905 | }; | |
906 | ||
907 | #define EXT4_HTREE_EOF 0x7fffffff | |
908 | ||
909 | /* | |
910 | * Control parameters used by ext4_htree_next_block | |
911 | */ | |
912 | #define HASH_NB_ALWAYS 1 | |
913 | ||
914 | ||
915 | /* | |
916 | * Describe an inode's exact location on disk and in memory | |
917 | */ | |
918 | struct ext4_iloc | |
919 | { | |
920 | struct buffer_head *bh; | |
921 | unsigned long offset; | |
922 | ext4_group_t block_group; | |
923 | }; | |
924 | ||
925 | static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc) | |
926 | { | |
927 | return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset); | |
928 | } | |
929 | ||
930 | /* | |
931 | * This structure is stuffed into the struct file's private_data field | |
932 | * for directories. It is where we put information so that we can do | |
933 | * readdir operations in hash tree order. | |
934 | */ | |
935 | struct dir_private_info { | |
936 | struct rb_root root; | |
937 | struct rb_node *curr_node; | |
938 | struct fname *extra_fname; | |
939 | loff_t last_pos; | |
940 | __u32 curr_hash; | |
941 | __u32 curr_minor_hash; | |
942 | __u32 next_hash; | |
943 | }; | |
944 | ||
945 | /* calculate the first block number of the group */ | |
946 | static inline ext4_fsblk_t | |
947 | ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no) | |
948 | { | |
949 | return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) + | |
950 | le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block); | |
951 | } | |
952 | ||
953 | /* | |
954 | * Special error return code only used by dx_probe() and its callers. | |
955 | */ | |
956 | #define ERR_BAD_DX_DIR -75000 | |
957 | ||
958 | void ext4_get_group_no_and_offset(struct super_block *sb, ext4_fsblk_t blocknr, | |
959 | ext4_group_t *blockgrpp, ext4_grpblk_t *offsetp); | |
960 | ||
961 | extern struct proc_dir_entry *ext4_proc_root; | |
962 | ||
963 | #ifdef CONFIG_PROC_FS | |
964 | extern const struct file_operations ext4_ui_proc_fops; | |
965 | ||
966 | #define EXT4_PROC_HANDLER(name, var) \ | |
967 | do { \ | |
968 | proc = proc_create_data(name, mode, sbi->s_proc, \ | |
969 | &ext4_ui_proc_fops, &sbi->s_##var); \ | |
970 | if (proc == NULL) { \ | |
971 | printk(KERN_ERR "EXT4-fs: can't create %s\n", name); \ | |
972 | goto err_out; \ | |
973 | } \ | |
974 | } while (0) | |
975 | #else | |
976 | #define EXT4_PROC_HANDLER(name, var) | |
977 | #endif | |
978 | ||
979 | /* | |
980 | * Function prototypes | |
981 | */ | |
982 | ||
983 | /* | |
984 | * Ok, these declarations are also in <linux/kernel.h> but none of the | |
985 | * ext4 source programs needs to include it so they are duplicated here. | |
986 | */ | |
987 | # define NORET_TYPE /**/ | |
988 | # define ATTRIB_NORET __attribute__((noreturn)) | |
989 | # define NORET_AND noreturn, | |
990 | ||
991 | /* bitmap.c */ | |
992 | extern unsigned int ext4_count_free(struct buffer_head *, unsigned); | |
993 | ||
994 | /* balloc.c */ | |
995 | extern unsigned int ext4_block_group(struct super_block *sb, | |
996 | ext4_fsblk_t blocknr); | |
997 | extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb, | |
998 | ext4_fsblk_t blocknr); | |
999 | extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group); | |
1000 | extern unsigned long ext4_bg_num_gdb(struct super_block *sb, | |
1001 | ext4_group_t group); | |
1002 | extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode, | |
1003 | ext4_fsblk_t goal, unsigned long *count, int *errp); | |
1004 | extern int ext4_claim_free_blocks(struct ext4_sb_info *sbi, s64 nblocks); | |
1005 | extern int ext4_has_free_blocks(struct ext4_sb_info *sbi, s64 nblocks); | |
1006 | extern void ext4_free_blocks(handle_t *handle, struct inode *inode, | |
1007 | ext4_fsblk_t block, unsigned long count, int metadata); | |
1008 | extern void ext4_add_groupblocks(handle_t *handle, struct super_block *sb, | |
1009 | ext4_fsblk_t block, unsigned long count); | |
1010 | extern ext4_fsblk_t ext4_count_free_blocks(struct super_block *); | |
1011 | extern void ext4_check_blocks_bitmap(struct super_block *); | |
1012 | extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb, | |
1013 | ext4_group_t block_group, | |
1014 | struct buffer_head ** bh); | |
1015 | extern int ext4_should_retry_alloc(struct super_block *sb, int *retries); | |
1016 | ||
1017 | /* dir.c */ | |
1018 | extern int ext4_check_dir_entry(const char *, struct inode *, | |
1019 | struct ext4_dir_entry_2 *, | |
1020 | struct buffer_head *, unsigned int); | |
1021 | extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash, | |
1022 | __u32 minor_hash, | |
1023 | struct ext4_dir_entry_2 *dirent); | |
1024 | extern void ext4_htree_free_dir_info(struct dir_private_info *p); | |
1025 | ||
1026 | /* fsync.c */ | |
1027 | extern int ext4_sync_file(struct file *, struct dentry *, int); | |
1028 | ||
1029 | /* hash.c */ | |
1030 | extern int ext4fs_dirhash(const char *name, int len, struct | |
1031 | dx_hash_info *hinfo); | |
1032 | ||
1033 | /* ialloc.c */ | |
1034 | extern struct inode * ext4_new_inode(handle_t *, struct inode *, int); | |
1035 | extern void ext4_free_inode(handle_t *, struct inode *); | |
1036 | extern struct inode * ext4_orphan_get(struct super_block *, unsigned long); | |
1037 | extern unsigned long ext4_count_free_inodes(struct super_block *); | |
1038 | extern unsigned long ext4_count_dirs(struct super_block *); | |
1039 | extern void ext4_check_inodes_bitmap(struct super_block *); | |
1040 | ||
1041 | /* mballoc.c */ | |
1042 | extern long ext4_mb_stats; | |
1043 | extern long ext4_mb_max_to_scan; | |
1044 | extern int ext4_mb_init(struct super_block *, int); | |
1045 | extern int ext4_mb_release(struct super_block *); | |
1046 | extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *, | |
1047 | struct ext4_allocation_request *, int *); | |
1048 | extern int ext4_mb_reserve_blocks(struct super_block *, int); | |
1049 | extern void ext4_discard_preallocations(struct inode *); | |
1050 | extern int __init init_ext4_mballoc(void); | |
1051 | extern void exit_ext4_mballoc(void); | |
1052 | extern void ext4_mb_free_blocks(handle_t *, struct inode *, | |
1053 | unsigned long, unsigned long, int, unsigned long *); | |
1054 | extern int ext4_mb_add_groupinfo(struct super_block *sb, | |
1055 | ext4_group_t i, struct ext4_group_desc *desc); | |
1056 | extern void ext4_mb_update_group_info(struct ext4_group_info *grp, | |
1057 | ext4_grpblk_t add); | |
1058 | extern int ext4_mb_get_buddy_cache_lock(struct super_block *, ext4_group_t); | |
1059 | extern void ext4_mb_put_buddy_cache_lock(struct super_block *, | |
1060 | ext4_group_t, int); | |
1061 | /* inode.c */ | |
1062 | int ext4_forget(handle_t *handle, int is_metadata, struct inode *inode, | |
1063 | struct buffer_head *bh, ext4_fsblk_t blocknr); | |
1064 | struct buffer_head *ext4_getblk(handle_t *, struct inode *, | |
1065 | ext4_lblk_t, int, int *); | |
1066 | struct buffer_head *ext4_bread(handle_t *, struct inode *, | |
1067 | ext4_lblk_t, int, int *); | |
1068 | int ext4_get_block(struct inode *inode, sector_t iblock, | |
1069 | struct buffer_head *bh_result, int create); | |
1070 | ||
1071 | extern struct inode *ext4_iget(struct super_block *, unsigned long); | |
1072 | extern int ext4_write_inode(struct inode *, int); | |
1073 | extern int ext4_setattr(struct dentry *, struct iattr *); | |
1074 | extern int ext4_getattr(struct vfsmount *mnt, struct dentry *dentry, | |
1075 | struct kstat *stat); | |
1076 | extern void ext4_delete_inode(struct inode *); | |
1077 | extern int ext4_sync_inode(handle_t *, struct inode *); | |
1078 | extern void ext4_dirty_inode(struct inode *); | |
1079 | extern int ext4_change_inode_journal_flag(struct inode *, int); | |
1080 | extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *); | |
1081 | extern int ext4_can_truncate(struct inode *inode); | |
1082 | extern void ext4_truncate(struct inode *); | |
1083 | extern void ext4_set_inode_flags(struct inode *); | |
1084 | extern void ext4_get_inode_flags(struct ext4_inode_info *); | |
1085 | extern void ext4_set_aops(struct inode *inode); | |
1086 | extern int ext4_writepage_trans_blocks(struct inode *); | |
1087 | extern int ext4_meta_trans_blocks(struct inode *, int nrblocks, int idxblocks); | |
1088 | extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks); | |
1089 | extern int ext4_block_truncate_page(handle_t *handle, | |
1090 | struct address_space *mapping, loff_t from); | |
1091 | extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct page *page); | |
1092 | extern qsize_t ext4_get_reserved_space(struct inode *inode); | |
1093 | ||
1094 | /* ioctl.c */ | |
1095 | extern long ext4_ioctl(struct file *, unsigned int, unsigned long); | |
1096 | extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long); | |
1097 | ||
1098 | /* migrate.c */ | |
1099 | extern int ext4_ext_migrate(struct inode *); | |
1100 | /* namei.c */ | |
1101 | extern int ext4_orphan_add(handle_t *, struct inode *); | |
1102 | extern int ext4_orphan_del(handle_t *, struct inode *); | |
1103 | extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash, | |
1104 | __u32 start_minor_hash, __u32 *next_hash); | |
1105 | ||
1106 | /* resize.c */ | |
1107 | extern int ext4_group_add(struct super_block *sb, | |
1108 | struct ext4_new_group_data *input); | |
1109 | extern int ext4_group_extend(struct super_block *sb, | |
1110 | struct ext4_super_block *es, | |
1111 | ext4_fsblk_t n_blocks_count); | |
1112 | ||
1113 | /* super.c */ | |
1114 | extern void ext4_error(struct super_block *, const char *, const char *, ...) | |
1115 | __attribute__ ((format (printf, 3, 4))); | |
1116 | extern void __ext4_std_error(struct super_block *, const char *, int); | |
1117 | extern void ext4_abort(struct super_block *, const char *, const char *, ...) | |
1118 | __attribute__ ((format (printf, 3, 4))); | |
1119 | extern void ext4_warning(struct super_block *, const char *, const char *, ...) | |
1120 | __attribute__ ((format (printf, 3, 4))); | |
1121 | extern void ext4_grp_locked_error(struct super_block *, ext4_group_t, | |
1122 | const char *, const char *, ...) | |
1123 | __attribute__ ((format (printf, 4, 5))); | |
1124 | extern void ext4_update_dynamic_rev(struct super_block *sb); | |
1125 | extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb, | |
1126 | __u32 compat); | |
1127 | extern int ext4_update_rocompat_feature(handle_t *handle, | |
1128 | struct super_block *sb, __u32 rocompat); | |
1129 | extern int ext4_update_incompat_feature(handle_t *handle, | |
1130 | struct super_block *sb, __u32 incompat); | |
1131 | extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb, | |
1132 | struct ext4_group_desc *bg); | |
1133 | extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb, | |
1134 | struct ext4_group_desc *bg); | |
1135 | extern ext4_fsblk_t ext4_inode_table(struct super_block *sb, | |
1136 | struct ext4_group_desc *bg); | |
1137 | extern __u32 ext4_free_blks_count(struct super_block *sb, | |
1138 | struct ext4_group_desc *bg); | |
1139 | extern __u32 ext4_free_inodes_count(struct super_block *sb, | |
1140 | struct ext4_group_desc *bg); | |
1141 | extern __u32 ext4_used_dirs_count(struct super_block *sb, | |
1142 | struct ext4_group_desc *bg); | |
1143 | extern __u32 ext4_itable_unused_count(struct super_block *sb, | |
1144 | struct ext4_group_desc *bg); | |
1145 | extern void ext4_block_bitmap_set(struct super_block *sb, | |
1146 | struct ext4_group_desc *bg, ext4_fsblk_t blk); | |
1147 | extern void ext4_inode_bitmap_set(struct super_block *sb, | |
1148 | struct ext4_group_desc *bg, ext4_fsblk_t blk); | |
1149 | extern void ext4_inode_table_set(struct super_block *sb, | |
1150 | struct ext4_group_desc *bg, ext4_fsblk_t blk); | |
1151 | extern void ext4_free_blks_set(struct super_block *sb, | |
1152 | struct ext4_group_desc *bg, __u32 count); | |
1153 | extern void ext4_free_inodes_set(struct super_block *sb, | |
1154 | struct ext4_group_desc *bg, __u32 count); | |
1155 | extern void ext4_used_dirs_set(struct super_block *sb, | |
1156 | struct ext4_group_desc *bg, __u32 count); | |
1157 | extern void ext4_itable_unused_set(struct super_block *sb, | |
1158 | struct ext4_group_desc *bg, __u32 count); | |
1159 | ||
1160 | static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es) | |
1161 | { | |
1162 | return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) | | |
1163 | le32_to_cpu(es->s_blocks_count_lo); | |
1164 | } | |
1165 | ||
1166 | static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es) | |
1167 | { | |
1168 | return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) | | |
1169 | le32_to_cpu(es->s_r_blocks_count_lo); | |
1170 | } | |
1171 | ||
1172 | static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es) | |
1173 | { | |
1174 | return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) | | |
1175 | le32_to_cpu(es->s_free_blocks_count_lo); | |
1176 | } | |
1177 | ||
1178 | static inline void ext4_blocks_count_set(struct ext4_super_block *es, | |
1179 | ext4_fsblk_t blk) | |
1180 | { | |
1181 | es->s_blocks_count_lo = cpu_to_le32((u32)blk); | |
1182 | es->s_blocks_count_hi = cpu_to_le32(blk >> 32); | |
1183 | } | |
1184 | ||
1185 | static inline void ext4_free_blocks_count_set(struct ext4_super_block *es, | |
1186 | ext4_fsblk_t blk) | |
1187 | { | |
1188 | es->s_free_blocks_count_lo = cpu_to_le32((u32)blk); | |
1189 | es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32); | |
1190 | } | |
1191 | ||
1192 | static inline void ext4_r_blocks_count_set(struct ext4_super_block *es, | |
1193 | ext4_fsblk_t blk) | |
1194 | { | |
1195 | es->s_r_blocks_count_lo = cpu_to_le32((u32)blk); | |
1196 | es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32); | |
1197 | } | |
1198 | ||
1199 | static inline loff_t ext4_isize(struct ext4_inode *raw_inode) | |
1200 | { | |
1201 | if (S_ISREG(le16_to_cpu(raw_inode->i_mode))) | |
1202 | return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) | | |
1203 | le32_to_cpu(raw_inode->i_size_lo); | |
1204 | else | |
1205 | return (loff_t) le32_to_cpu(raw_inode->i_size_lo); | |
1206 | } | |
1207 | ||
1208 | static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size) | |
1209 | { | |
1210 | raw_inode->i_size_lo = cpu_to_le32(i_size); | |
1211 | raw_inode->i_size_high = cpu_to_le32(i_size >> 32); | |
1212 | } | |
1213 | ||
1214 | static inline | |
1215 | struct ext4_group_info *ext4_get_group_info(struct super_block *sb, | |
1216 | ext4_group_t group) | |
1217 | { | |
1218 | struct ext4_group_info ***grp_info; | |
1219 | long indexv, indexh; | |
1220 | grp_info = EXT4_SB(sb)->s_group_info; | |
1221 | indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb)); | |
1222 | indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1); | |
1223 | return grp_info[indexv][indexh]; | |
1224 | } | |
1225 | ||
1226 | ||
1227 | static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi, | |
1228 | ext4_group_t block_group) | |
1229 | { | |
1230 | return block_group >> sbi->s_log_groups_per_flex; | |
1231 | } | |
1232 | ||
1233 | static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi) | |
1234 | { | |
1235 | return 1 << sbi->s_log_groups_per_flex; | |
1236 | } | |
1237 | ||
1238 | #define ext4_std_error(sb, errno) \ | |
1239 | do { \ | |
1240 | if ((errno)) \ | |
1241 | __ext4_std_error((sb), __func__, (errno)); \ | |
1242 | } while (0) | |
1243 | ||
1244 | #ifdef CONFIG_SMP | |
1245 | /* Each CPU can accumulate percpu_counter_batch blocks in their local | |
1246 | * counters. So we need to make sure we have free blocks more | |
1247 | * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times. | |
1248 | */ | |
1249 | #define EXT4_FREEBLOCKS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids)) | |
1250 | #else | |
1251 | #define EXT4_FREEBLOCKS_WATERMARK 0 | |
1252 | #endif | |
1253 | ||
1254 | static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize) | |
1255 | { | |
1256 | /* | |
1257 | * XXX: replace with spinlock if seen contended -bzzz | |
1258 | */ | |
1259 | down_write(&EXT4_I(inode)->i_data_sem); | |
1260 | if (newsize > EXT4_I(inode)->i_disksize) | |
1261 | EXT4_I(inode)->i_disksize = newsize; | |
1262 | up_write(&EXT4_I(inode)->i_data_sem); | |
1263 | return ; | |
1264 | } | |
1265 | ||
1266 | struct ext4_group_info { | |
1267 | unsigned long bb_state; | |
1268 | struct rb_root bb_free_root; | |
1269 | unsigned short bb_first_free; | |
1270 | unsigned short bb_free; | |
1271 | unsigned short bb_fragments; | |
1272 | struct list_head bb_prealloc_list; | |
1273 | #ifdef DOUBLE_CHECK | |
1274 | void *bb_bitmap; | |
1275 | #endif | |
1276 | struct rw_semaphore alloc_sem; | |
1277 | unsigned short bb_counters[]; | |
1278 | }; | |
1279 | ||
1280 | #define EXT4_GROUP_INFO_NEED_INIT_BIT 0 | |
1281 | #define EXT4_GROUP_INFO_LOCKED_BIT 1 | |
1282 | ||
1283 | #define EXT4_MB_GRP_NEED_INIT(grp) \ | |
1284 | (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state))) | |
1285 | ||
1286 | static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group) | |
1287 | { | |
1288 | struct ext4_group_info *grinfo = ext4_get_group_info(sb, group); | |
1289 | ||
1290 | bit_spin_lock(EXT4_GROUP_INFO_LOCKED_BIT, &(grinfo->bb_state)); | |
1291 | } | |
1292 | ||
1293 | static inline void ext4_unlock_group(struct super_block *sb, | |
1294 | ext4_group_t group) | |
1295 | { | |
1296 | struct ext4_group_info *grinfo = ext4_get_group_info(sb, group); | |
1297 | ||
1298 | bit_spin_unlock(EXT4_GROUP_INFO_LOCKED_BIT, &(grinfo->bb_state)); | |
1299 | } | |
1300 | ||
1301 | static inline int ext4_is_group_locked(struct super_block *sb, | |
1302 | ext4_group_t group) | |
1303 | { | |
1304 | struct ext4_group_info *grinfo = ext4_get_group_info(sb, group); | |
1305 | ||
1306 | return bit_spin_is_locked(EXT4_GROUP_INFO_LOCKED_BIT, | |
1307 | &(grinfo->bb_state)); | |
1308 | } | |
1309 | ||
1310 | /* | |
1311 | * Inodes and files operations | |
1312 | */ | |
1313 | ||
1314 | /* dir.c */ | |
1315 | extern const struct file_operations ext4_dir_operations; | |
1316 | ||
1317 | /* file.c */ | |
1318 | extern const struct inode_operations ext4_file_inode_operations; | |
1319 | extern const struct file_operations ext4_file_operations; | |
1320 | ||
1321 | /* namei.c */ | |
1322 | extern const struct inode_operations ext4_dir_inode_operations; | |
1323 | extern const struct inode_operations ext4_special_inode_operations; | |
1324 | ||
1325 | /* symlink.c */ | |
1326 | extern const struct inode_operations ext4_symlink_inode_operations; | |
1327 | extern const struct inode_operations ext4_fast_symlink_inode_operations; | |
1328 | ||
1329 | /* extents.c */ | |
1330 | extern int ext4_ext_tree_init(handle_t *handle, struct inode *); | |
1331 | extern int ext4_ext_writepage_trans_blocks(struct inode *, int); | |
1332 | extern int ext4_ext_index_trans_blocks(struct inode *inode, int nrblocks, | |
1333 | int chunk); | |
1334 | extern int ext4_ext_get_blocks(handle_t *handle, struct inode *inode, | |
1335 | ext4_lblk_t iblock, unsigned int max_blocks, | |
1336 | struct buffer_head *bh_result, | |
1337 | int create, int extend_disksize); | |
1338 | extern void ext4_ext_truncate(struct inode *); | |
1339 | extern void ext4_ext_init(struct super_block *); | |
1340 | extern void ext4_ext_release(struct super_block *); | |
1341 | extern long ext4_fallocate(struct inode *inode, int mode, loff_t offset, | |
1342 | loff_t len); | |
1343 | extern int ext4_get_blocks_wrap(handle_t *handle, struct inode *inode, | |
1344 | sector_t block, unsigned int max_blocks, | |
1345 | struct buffer_head *bh, int create, | |
1346 | int extend_disksize, int flag); | |
1347 | extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, | |
1348 | __u64 start, __u64 len); | |
1349 | ||
1350 | /* | |
1351 | * Add new method to test wether block and inode bitmaps are properly | |
1352 | * initialized. With uninit_bg reading the block from disk is not enough | |
1353 | * to mark the bitmap uptodate. We need to also zero-out the bitmap | |
1354 | */ | |
1355 | #define BH_BITMAP_UPTODATE BH_JBDPrivateStart | |
1356 | ||
1357 | static inline int bitmap_uptodate(struct buffer_head *bh) | |
1358 | { | |
1359 | return (buffer_uptodate(bh) && | |
1360 | test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state)); | |
1361 | } | |
1362 | static inline void set_bitmap_uptodate(struct buffer_head *bh) | |
1363 | { | |
1364 | set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state); | |
1365 | } | |
1366 | ||
1367 | #endif /* __KERNEL__ */ | |
1368 | ||
1369 | #endif /* _EXT4_H */ |