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eed10e39 KS |
1 | /* |
2 | * nilfs2_fs.h - NILFS2 on-disk structures and common declarations. | |
3 | * | |
4 | * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation. | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; if not, write to the Free Software | |
18 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
19 | * | |
20 | * Written by Koji Sato <koji@osrg.net> | |
21 | * Ryusuke Konishi <ryusuke@osrg.net> | |
22 | */ | |
23 | /* | |
24 | * linux/include/linux/ext2_fs.h | |
25 | * | |
26 | * Copyright (C) 1992, 1993, 1994, 1995 | |
27 | * Remy Card (card@masi.ibp.fr) | |
28 | * Laboratoire MASI - Institut Blaise Pascal | |
29 | * Universite Pierre et Marie Curie (Paris VI) | |
30 | * | |
31 | * from | |
32 | * | |
33 | * linux/include/linux/minix_fs.h | |
34 | * | |
35 | * Copyright (C) 1991, 1992 Linus Torvalds | |
36 | */ | |
37 | ||
38 | #ifndef _LINUX_NILFS_FS_H | |
39 | #define _LINUX_NILFS_FS_H | |
40 | ||
41 | #include <linux/types.h> | |
42 | #include <linux/ioctl.h> | |
43 | ||
44 | /* | |
45 | * Inode flags stored in nilfs_inode and on-memory nilfs inode | |
46 | * | |
47 | * We define these flags based on ext2-fs because of the | |
48 | * compatibility reason; to avoid problems in chattr(1) | |
49 | */ | |
50 | #define NILFS_SECRM_FL 0x00000001 /* Secure deletion */ | |
51 | #define NILFS_UNRM_FL 0x00000002 /* Undelete */ | |
52 | #define NILFS_SYNC_FL 0x00000008 /* Synchronous updates */ | |
53 | #define NILFS_IMMUTABLE_FL 0x00000010 /* Immutable file */ | |
54 | #define NILFS_APPEND_FL 0x00000020 /* writes to file may only append */ | |
55 | #define NILFS_NODUMP_FL 0x00000040 /* do not dump file */ | |
56 | #define NILFS_NOATIME_FL 0x00000080 /* do not update atime */ | |
57 | /* Reserved for compression usage... */ | |
58 | #define NILFS_NOTAIL_FL 0x00008000 /* file tail should not be merged */ | |
59 | #define NILFS_DIRSYNC_FL 0x00010000 /* dirsync behaviour */ | |
60 | ||
61 | #define NILFS_FL_USER_VISIBLE 0x0003DFFF /* User visible flags */ | |
62 | #define NILFS_FL_USER_MODIFIABLE 0x000380FF /* User modifiable flags */ | |
63 | ||
64 | ||
65 | #define NILFS_INODE_BMAP_SIZE 7 | |
66 | /** | |
67 | * struct nilfs_inode - structure of an inode on disk | |
68 | * @i_blocks: blocks count | |
69 | * @i_size: size in bytes | |
61239230 RK |
70 | * @i_ctime: creation time (seconds) |
71 | * @i_mtime: modification time (seconds) | |
72 | * @i_ctime_nsec: creation time (nano seconds) | |
73 | * @i_mtime_nsec: modification time (nano seconds) | |
eed10e39 KS |
74 | * @i_uid: user id |
75 | * @i_gid: group id | |
76 | * @i_mode: file mode | |
77 | * @i_links_count: links count | |
78 | * @i_flags: file flags | |
79 | * @i_bmap: block mapping | |
80 | * @i_xattr: extended attributes | |
81 | * @i_generation: file generation (for NFS) | |
82 | * @i_pad: padding | |
83 | */ | |
84 | struct nilfs_inode { | |
85 | __le64 i_blocks; | |
86 | __le64 i_size; | |
87 | __le64 i_ctime; | |
88 | __le64 i_mtime; | |
61239230 RK |
89 | __le32 i_ctime_nsec; |
90 | __le32 i_mtime_nsec; | |
eed10e39 KS |
91 | __le32 i_uid; |
92 | __le32 i_gid; | |
93 | __le16 i_mode; | |
94 | __le16 i_links_count; | |
95 | __le32 i_flags; | |
96 | __le64 i_bmap[NILFS_INODE_BMAP_SIZE]; | |
97 | #define i_device_code i_bmap[0] | |
98 | __le64 i_xattr; | |
99 | __le32 i_generation; | |
100 | __le32 i_pad; | |
101 | }; | |
102 | ||
103 | /** | |
104 | * struct nilfs_super_root - structure of super root | |
105 | * @sr_sum: check sum | |
106 | * @sr_bytes: byte count of the structure | |
107 | * @sr_flags: flags (reserved) | |
108 | * @sr_nongc_ctime: write time of the last segment not for cleaner operation | |
109 | * @sr_dat: DAT file inode | |
110 | * @sr_cpfile: checkpoint file inode | |
111 | * @sr_sufile: segment usage file inode | |
112 | */ | |
113 | struct nilfs_super_root { | |
114 | __le32 sr_sum; | |
115 | __le16 sr_bytes; | |
116 | __le16 sr_flags; | |
117 | __le64 sr_nongc_ctime; | |
118 | struct nilfs_inode sr_dat; | |
119 | struct nilfs_inode sr_cpfile; | |
120 | struct nilfs_inode sr_sufile; | |
121 | }; | |
122 | ||
123 | #define NILFS_SR_MDT_OFFSET(inode_size, i) \ | |
124 | ((unsigned long)&((struct nilfs_super_root *)0)->sr_dat + \ | |
125 | (inode_size) * (i)) | |
126 | #define NILFS_SR_DAT_OFFSET(inode_size) NILFS_SR_MDT_OFFSET(inode_size, 0) | |
127 | #define NILFS_SR_CPFILE_OFFSET(inode_size) NILFS_SR_MDT_OFFSET(inode_size, 1) | |
128 | #define NILFS_SR_SUFILE_OFFSET(inode_size) NILFS_SR_MDT_OFFSET(inode_size, 2) | |
129 | #define NILFS_SR_BYTES (sizeof(struct nilfs_super_root)) | |
130 | ||
131 | /* | |
132 | * Maximal mount counts | |
133 | */ | |
134 | #define NILFS_DFL_MAX_MNT_COUNT 50 /* 50 mounts */ | |
135 | ||
136 | /* | |
137 | * File system states (sbp->s_state, nilfs->ns_mount_state) | |
138 | */ | |
139 | #define NILFS_VALID_FS 0x0001 /* Unmounted cleanly */ | |
140 | #define NILFS_ERROR_FS 0x0002 /* Errors detected */ | |
141 | #define NILFS_RESIZE_FS 0x0004 /* Resize required */ | |
142 | ||
143 | /* | |
144 | * Mount flags (sbi->s_mount_opt) | |
145 | */ | |
146 | #define NILFS_MOUNT_ERROR_MODE 0x0070 /* Error mode mask */ | |
147 | #define NILFS_MOUNT_ERRORS_CONT 0x0010 /* Continue on errors */ | |
148 | #define NILFS_MOUNT_ERRORS_RO 0x0020 /* Remount fs ro on errors */ | |
149 | #define NILFS_MOUNT_ERRORS_PANIC 0x0040 /* Panic on errors */ | |
150 | #define NILFS_MOUNT_SNAPSHOT 0x0080 /* Snapshot flag */ | |
151 | #define NILFS_MOUNT_BARRIER 0x1000 /* Use block barriers */ | |
152 | #define NILFS_MOUNT_STRICT_ORDER 0x2000 /* Apply strict in-order | |
153 | semantics also for data */ | |
0234576d RK |
154 | #define NILFS_MOUNT_NORECOVERY 0x4000 /* Disable write access during |
155 | mount-time recovery */ | |
e902ec99 | 156 | #define NILFS_MOUNT_DISCARD 0x8000 /* Issue DISCARD requests */ |
eed10e39 KS |
157 | |
158 | ||
159 | /** | |
160 | * struct nilfs_super_block - structure of super block on disk | |
161 | */ | |
162 | struct nilfs_super_block { | |
2f1b7cd2 | 163 | /*00*/ __le32 s_rev_level; /* Revision level */ |
eed10e39 KS |
164 | __le16 s_minor_rev_level; /* minor revision level */ |
165 | __le16 s_magic; /* Magic signature */ | |
166 | ||
167 | __le16 s_bytes; /* Bytes count of CRC calculation | |
168 | for this structure. s_reserved | |
169 | is excluded. */ | |
170 | __le16 s_flags; /* flags */ | |
171 | __le32 s_crc_seed; /* Seed value of CRC calculation */ | |
2f1b7cd2 | 172 | /*10*/ __le32 s_sum; /* Check sum of super block */ |
eed10e39 KS |
173 | |
174 | __le32 s_log_block_size; /* Block size represented as follows | |
175 | blocksize = | |
176 | 1 << (s_log_block_size + 10) */ | |
177 | __le64 s_nsegments; /* Number of segments in filesystem */ | |
2f1b7cd2 | 178 | /*20*/ __le64 s_dev_size; /* block device size in bytes */ |
eed10e39 | 179 | __le64 s_first_data_block; /* 1st seg disk block number */ |
2f1b7cd2 | 180 | /*30*/ __le32 s_blocks_per_segment; /* number of blocks per full segment */ |
eed10e39 KS |
181 | __le32 s_r_segments_percentage; /* Reserved segments percentage */ |
182 | ||
183 | __le64 s_last_cno; /* Last checkpoint number */ | |
2f1b7cd2 | 184 | /*40*/ __le64 s_last_pseg; /* disk block addr pseg written last */ |
eed10e39 | 185 | __le64 s_last_seq; /* seq. number of seg written last */ |
2f1b7cd2 | 186 | /*50*/ __le64 s_free_blocks_count; /* Free blocks count */ |
eed10e39 KS |
187 | |
188 | __le64 s_ctime; /* Creation time (execution time of | |
189 | newfs) */ | |
2f1b7cd2 | 190 | /*60*/ __le64 s_mtime; /* Mount time */ |
eed10e39 | 191 | __le64 s_wtime; /* Write time */ |
2f1b7cd2 | 192 | /*70*/ __le16 s_mnt_count; /* Mount count */ |
eed10e39 KS |
193 | __le16 s_max_mnt_count; /* Maximal mount count */ |
194 | __le16 s_state; /* File system state */ | |
195 | __le16 s_errors; /* Behaviour when detecting errors */ | |
196 | __le64 s_lastcheck; /* time of last check */ | |
197 | ||
2f1b7cd2 | 198 | /*80*/ __le32 s_checkinterval; /* max. time between checks */ |
eed10e39 KS |
199 | __le32 s_creator_os; /* OS */ |
200 | __le16 s_def_resuid; /* Default uid for reserved blocks */ | |
201 | __le16 s_def_resgid; /* Default gid for reserved blocks */ | |
0d9cc233 | 202 | __le32 s_first_ino; /* First non-reserved inode */ |
eed10e39 | 203 | |
2f1b7cd2 | 204 | /*90*/ __le16 s_inode_size; /* Size of an inode */ |
eed10e39 KS |
205 | __le16 s_dat_entry_size; /* Size of a dat entry */ |
206 | __le16 s_checkpoint_size; /* Size of a checkpoint */ | |
207 | __le16 s_segment_usage_size; /* Size of a segment usage */ | |
208 | ||
2f1b7cd2 RK |
209 | /*98*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */ |
210 | /*A8*/ char s_volume_name[80]; /* volume name */ | |
eed10e39 | 211 | |
2f1b7cd2 | 212 | /*F8*/ __le32 s_c_interval; /* Commit interval of segment */ |
eed10e39 KS |
213 | __le32 s_c_block_max; /* Threshold of data amount for |
214 | the segment construction */ | |
1a80a176 RK |
215 | /*100*/ __le64 s_feature_compat; /* Compatible feature set */ |
216 | __le64 s_feature_compat_ro; /* Read-only compatible feature set */ | |
217 | __le64 s_feature_incompat; /* Incompatible feature set */ | |
218 | __u32 s_reserved[186]; /* padding to the end of the block */ | |
eed10e39 KS |
219 | }; |
220 | ||
221 | /* | |
222 | * Codes for operating systems | |
223 | */ | |
224 | #define NILFS_OS_LINUX 0 | |
225 | /* Codes from 1 to 4 are reserved to keep compatibility with ext2 creator-OS */ | |
226 | ||
227 | /* | |
228 | * Revision levels | |
229 | */ | |
230 | #define NILFS_CURRENT_REV 2 /* current major revision */ | |
231 | #define NILFS_MINOR_REV 0 /* minor revision */ | |
232 | ||
1a80a176 RK |
233 | /* |
234 | * Feature set definitions | |
235 | * | |
236 | * If there is a bit set in the incompatible feature set that the kernel | |
237 | * doesn't know about, it should refuse to mount the filesystem. | |
238 | */ | |
239 | #define NILFS_FEATURE_COMPAT_SUPP 0ULL | |
240 | #define NILFS_FEATURE_COMPAT_RO_SUPP 0ULL | |
241 | #define NILFS_FEATURE_INCOMPAT_SUPP 0ULL | |
242 | ||
eed10e39 KS |
243 | /* |
244 | * Bytes count of super_block for CRC-calculation | |
245 | */ | |
246 | #define NILFS_SB_BYTES \ | |
247 | ((long)&((struct nilfs_super_block *)0)->s_reserved) | |
248 | ||
249 | /* | |
250 | * Special inode number | |
251 | */ | |
252 | #define NILFS_ROOT_INO 2 /* Root file inode */ | |
253 | #define NILFS_DAT_INO 3 /* DAT file */ | |
254 | #define NILFS_CPFILE_INO 4 /* checkpoint file */ | |
255 | #define NILFS_SUFILE_INO 5 /* segment usage file */ | |
256 | #define NILFS_IFILE_INO 6 /* ifile */ | |
257 | #define NILFS_ATIME_INO 7 /* Atime file (reserved) */ | |
258 | #define NILFS_XATTR_INO 8 /* Xattribute file (reserved) */ | |
259 | #define NILFS_SKETCH_INO 10 /* Sketch file */ | |
260 | #define NILFS_USER_INO 11 /* Fisrt user's file inode number */ | |
261 | ||
262 | #define NILFS_SB_OFFSET_BYTES 1024 /* byte offset of nilfs superblock */ | |
263 | #define NILFS_SUPER_MAGIC 0x3434 /* NILFS filesystem magic number */ | |
264 | ||
265 | #define NILFS_SEG_MIN_BLOCKS 16 /* Minimum number of blocks in | |
266 | a full segment */ | |
267 | #define NILFS_PSEG_MIN_BLOCKS 2 /* Minimum number of blocks in | |
268 | a partial segment */ | |
269 | #define NILFS_MIN_NRSVSEGS 8 /* Minimum number of reserved | |
270 | segments */ | |
271 | ||
e339ad31 RK |
272 | /* |
273 | * bytes offset of secondary super block | |
274 | */ | |
275 | #define NILFS_SB2_OFFSET_BYTES(devsize) ((((devsize) >> 12) - 1) << 12) | |
eed10e39 KS |
276 | |
277 | /* | |
278 | * Maximal count of links to a file | |
279 | */ | |
280 | #define NILFS_LINK_MAX 32000 | |
281 | ||
282 | /* | |
283 | * Structure of a directory entry | |
284 | * (Same as ext2) | |
285 | */ | |
286 | ||
287 | #define NILFS_NAME_LEN 255 | |
288 | ||
89c0fd01 RK |
289 | /* |
290 | * Block size limitations | |
291 | */ | |
292 | #define NILFS_MIN_BLOCK_SIZE 1024 | |
293 | #define NILFS_MAX_BLOCK_SIZE 65536 | |
294 | ||
eed10e39 KS |
295 | /* |
296 | * The new version of the directory entry. Since V0 structures are | |
297 | * stored in intel byte order, and the name_len field could never be | |
298 | * bigger than 255 chars, it's safe to reclaim the extra byte for the | |
299 | * file_type field. | |
300 | */ | |
301 | struct nilfs_dir_entry { | |
302 | __le64 inode; /* Inode number */ | |
303 | __le16 rec_len; /* Directory entry length */ | |
304 | __u8 name_len; /* Name length */ | |
305 | __u8 file_type; | |
306 | char name[NILFS_NAME_LEN]; /* File name */ | |
307 | char pad; | |
308 | }; | |
309 | ||
310 | /* | |
311 | * NILFS directory file types. Only the low 3 bits are used. The | |
312 | * other bits are reserved for now. | |
313 | */ | |
314 | enum { | |
315 | NILFS_FT_UNKNOWN, | |
316 | NILFS_FT_REG_FILE, | |
317 | NILFS_FT_DIR, | |
318 | NILFS_FT_CHRDEV, | |
319 | NILFS_FT_BLKDEV, | |
320 | NILFS_FT_FIFO, | |
321 | NILFS_FT_SOCK, | |
322 | NILFS_FT_SYMLINK, | |
323 | NILFS_FT_MAX | |
324 | }; | |
325 | ||
326 | /* | |
327 | * NILFS_DIR_PAD defines the directory entries boundaries | |
328 | * | |
329 | * NOTE: It must be a multiple of 8 | |
330 | */ | |
331 | #define NILFS_DIR_PAD 8 | |
332 | #define NILFS_DIR_ROUND (NILFS_DIR_PAD - 1) | |
333 | #define NILFS_DIR_REC_LEN(name_len) (((name_len) + 12 + NILFS_DIR_ROUND) & \ | |
334 | ~NILFS_DIR_ROUND) | |
6cda9fa2 RK |
335 | #define NILFS_MAX_REC_LEN ((1<<16)-1) |
336 | ||
337 | static inline unsigned nilfs_rec_len_from_disk(__le16 dlen) | |
338 | { | |
339 | unsigned len = le16_to_cpu(dlen); | |
340 | ||
341 | if (len == NILFS_MAX_REC_LEN) | |
342 | return 1 << 16; | |
343 | return len; | |
344 | } | |
345 | ||
346 | static inline __le16 nilfs_rec_len_to_disk(unsigned len) | |
347 | { | |
348 | if (len == (1 << 16)) | |
349 | return cpu_to_le16(NILFS_MAX_REC_LEN); | |
350 | else if (len > (1 << 16)) | |
351 | BUG(); | |
352 | return cpu_to_le16(len); | |
353 | } | |
eed10e39 KS |
354 | |
355 | /** | |
356 | * struct nilfs_finfo - file information | |
357 | * @fi_ino: inode number | |
358 | * @fi_cno: checkpoint number | |
359 | * @fi_nblocks: number of blocks (including intermediate blocks) | |
360 | * @fi_ndatablk: number of file data blocks | |
361 | */ | |
362 | struct nilfs_finfo { | |
363 | __le64 fi_ino; | |
364 | __le64 fi_cno; | |
365 | __le32 fi_nblocks; | |
366 | __le32 fi_ndatablk; | |
367 | /* array of virtual block numbers */ | |
368 | }; | |
369 | ||
370 | /** | |
371 | * struct nilfs_binfo_v - information for the block to which a virtual block number is assigned | |
372 | * @bi_vblocknr: virtual block number | |
373 | * @bi_blkoff: block offset | |
374 | */ | |
375 | struct nilfs_binfo_v { | |
376 | __le64 bi_vblocknr; | |
377 | __le64 bi_blkoff; | |
378 | }; | |
379 | ||
380 | /** | |
381 | * struct nilfs_binfo_dat - information for the block which belongs to the DAT file | |
382 | * @bi_blkoff: block offset | |
383 | * @bi_level: level | |
384 | * @bi_pad: padding | |
385 | */ | |
386 | struct nilfs_binfo_dat { | |
387 | __le64 bi_blkoff; | |
388 | __u8 bi_level; | |
389 | __u8 bi_pad[7]; | |
390 | }; | |
391 | ||
392 | /** | |
393 | * union nilfs_binfo: block information | |
394 | * @bi_v: nilfs_binfo_v structure | |
395 | * @bi_dat: nilfs_binfo_dat structure | |
396 | */ | |
397 | union nilfs_binfo { | |
398 | struct nilfs_binfo_v bi_v; | |
399 | struct nilfs_binfo_dat bi_dat; | |
400 | }; | |
401 | ||
402 | /** | |
403 | * struct nilfs_segment_summary - segment summary | |
404 | * @ss_datasum: checksum of data | |
405 | * @ss_sumsum: checksum of segment summary | |
406 | * @ss_magic: magic number | |
407 | * @ss_bytes: size of this structure in bytes | |
408 | * @ss_flags: flags | |
409 | * @ss_seq: sequence number | |
410 | * @ss_create: creation timestamp | |
411 | * @ss_next: next segment | |
412 | * @ss_nblocks: number of blocks | |
413 | * @ss_nfinfo: number of finfo structures | |
414 | * @ss_sumbytes: total size of segment summary in bytes | |
415 | * @ss_pad: padding | |
50614bcf | 416 | * @ss_cno: checkpoint number |
eed10e39 KS |
417 | */ |
418 | struct nilfs_segment_summary { | |
419 | __le32 ss_datasum; | |
420 | __le32 ss_sumsum; | |
421 | __le32 ss_magic; | |
422 | __le16 ss_bytes; | |
423 | __le16 ss_flags; | |
424 | __le64 ss_seq; | |
425 | __le64 ss_create; | |
426 | __le64 ss_next; | |
427 | __le32 ss_nblocks; | |
428 | __le32 ss_nfinfo; | |
429 | __le32 ss_sumbytes; | |
430 | __le32 ss_pad; | |
50614bcf | 431 | __le64 ss_cno; |
eed10e39 KS |
432 | /* array of finfo structures */ |
433 | }; | |
434 | ||
435 | #define NILFS_SEGSUM_MAGIC 0x1eaffa11 /* segment summary magic number */ | |
436 | ||
437 | /* | |
438 | * Segment summary flags | |
439 | */ | |
440 | #define NILFS_SS_LOGBGN 0x0001 /* begins a logical segment */ | |
441 | #define NILFS_SS_LOGEND 0x0002 /* ends a logical segment */ | |
442 | #define NILFS_SS_SR 0x0004 /* has super root */ | |
443 | #define NILFS_SS_SYNDT 0x0008 /* includes data only updates */ | |
444 | #define NILFS_SS_GC 0x0010 /* segment written for cleaner operation */ | |
445 | ||
6600b9dd JS |
446 | /** |
447 | * struct nilfs_btree_node - B-tree node | |
448 | * @bn_flags: flags | |
449 | * @bn_level: level | |
450 | * @bn_nchildren: number of children | |
451 | * @bn_pad: padding | |
452 | */ | |
453 | struct nilfs_btree_node { | |
454 | __u8 bn_flags; | |
455 | __u8 bn_level; | |
456 | __le16 bn_nchildren; | |
457 | __le32 bn_pad; | |
458 | }; | |
459 | ||
460 | /* flags */ | |
461 | #define NILFS_BTREE_NODE_ROOT 0x01 | |
462 | ||
463 | /* level */ | |
464 | #define NILFS_BTREE_LEVEL_DATA 0 | |
465 | #define NILFS_BTREE_LEVEL_NODE_MIN (NILFS_BTREE_LEVEL_DATA + 1) | |
466 | #define NILFS_BTREE_LEVEL_MAX 14 | |
467 | ||
eed10e39 KS |
468 | /** |
469 | * struct nilfs_palloc_group_desc - block group descriptor | |
470 | * @pg_nfrees: number of free entries in block group | |
471 | */ | |
472 | struct nilfs_palloc_group_desc { | |
473 | __le32 pg_nfrees; | |
474 | }; | |
475 | ||
476 | /** | |
477 | * struct nilfs_dat_entry - disk address translation entry | |
37e11f33 QF |
478 | * @de_blocknr: block number |
479 | * @de_start: start checkpoint number | |
480 | * @de_end: end checkpoint number | |
481 | * @de_rsv: reserved for future use | |
eed10e39 KS |
482 | */ |
483 | struct nilfs_dat_entry { | |
484 | __le64 de_blocknr; | |
485 | __le64 de_start; | |
486 | __le64 de_end; | |
487 | __le64 de_rsv; | |
488 | }; | |
489 | ||
eed10e39 KS |
490 | /** |
491 | * struct nilfs_snapshot_list - snapshot list | |
492 | * @ssl_next: next checkpoint number on snapshot list | |
493 | * @ssl_prev: previous checkpoint number on snapshot list | |
494 | */ | |
495 | struct nilfs_snapshot_list { | |
496 | __le64 ssl_next; | |
497 | __le64 ssl_prev; | |
498 | }; | |
499 | ||
500 | /** | |
501 | * struct nilfs_checkpoint - checkpoint structure | |
502 | * @cp_flags: flags | |
503 | * @cp_checkpoints_count: checkpoints count in a block | |
504 | * @cp_snapshot_list: snapshot list | |
505 | * @cp_cno: checkpoint number | |
506 | * @cp_create: creation timestamp | |
507 | * @cp_nblk_inc: number of blocks incremented by this checkpoint | |
508 | * @cp_inodes_count: inodes count | |
509 | * @cp_blocks_count: blocks count | |
510 | * @cp_ifile_inode: inode of ifile | |
511 | */ | |
512 | struct nilfs_checkpoint { | |
513 | __le32 cp_flags; | |
514 | __le32 cp_checkpoints_count; | |
515 | struct nilfs_snapshot_list cp_snapshot_list; | |
516 | __le64 cp_cno; | |
517 | __le64 cp_create; | |
518 | __le64 cp_nblk_inc; | |
519 | __le64 cp_inodes_count; | |
520 | __le64 cp_blocks_count; /* Reserved (might be deleted) */ | |
521 | ||
522 | /* Do not change the byte offset of ifile inode. | |
523 | To keep the compatibility of the disk format, | |
524 | additional fields should be added behind cp_ifile_inode. */ | |
525 | struct nilfs_inode cp_ifile_inode; | |
526 | }; | |
527 | ||
528 | /* checkpoint flags */ | |
529 | enum { | |
530 | NILFS_CHECKPOINT_SNAPSHOT, | |
531 | NILFS_CHECKPOINT_INVALID, | |
532 | NILFS_CHECKPOINT_SKETCH, | |
c96fa464 | 533 | NILFS_CHECKPOINT_MINOR, |
eed10e39 KS |
534 | }; |
535 | ||
536 | #define NILFS_CHECKPOINT_FNS(flag, name) \ | |
537 | static inline void \ | |
538 | nilfs_checkpoint_set_##name(struct nilfs_checkpoint *cp) \ | |
539 | { \ | |
540 | cp->cp_flags = cpu_to_le32(le32_to_cpu(cp->cp_flags) | \ | |
541 | (1UL << NILFS_CHECKPOINT_##flag)); \ | |
542 | } \ | |
543 | static inline void \ | |
544 | nilfs_checkpoint_clear_##name(struct nilfs_checkpoint *cp) \ | |
545 | { \ | |
546 | cp->cp_flags = cpu_to_le32(le32_to_cpu(cp->cp_flags) & \ | |
547 | ~(1UL << NILFS_CHECKPOINT_##flag)); \ | |
548 | } \ | |
549 | static inline int \ | |
550 | nilfs_checkpoint_##name(const struct nilfs_checkpoint *cp) \ | |
551 | { \ | |
552 | return !!(le32_to_cpu(cp->cp_flags) & \ | |
553 | (1UL << NILFS_CHECKPOINT_##flag)); \ | |
554 | } | |
555 | ||
556 | NILFS_CHECKPOINT_FNS(SNAPSHOT, snapshot) | |
557 | NILFS_CHECKPOINT_FNS(INVALID, invalid) | |
c96fa464 | 558 | NILFS_CHECKPOINT_FNS(MINOR, minor) |
eed10e39 KS |
559 | |
560 | /** | |
561 | * struct nilfs_cpinfo - checkpoint information | |
562 | * @ci_flags: flags | |
dc498d09 | 563 | * @ci_pad: padding |
eed10e39 KS |
564 | * @ci_cno: checkpoint number |
565 | * @ci_create: creation timestamp | |
566 | * @ci_nblk_inc: number of blocks incremented by this checkpoint | |
567 | * @ci_inodes_count: inodes count | |
568 | * @ci_blocks_count: blocks count | |
569 | * @ci_next: next checkpoint number in snapshot list | |
570 | */ | |
571 | struct nilfs_cpinfo { | |
572 | __u32 ci_flags; | |
dc498d09 | 573 | __u32 ci_pad; |
eed10e39 KS |
574 | __u64 ci_cno; |
575 | __u64 ci_create; | |
576 | __u64 ci_nblk_inc; | |
577 | __u64 ci_inodes_count; | |
578 | __u64 ci_blocks_count; | |
579 | __u64 ci_next; | |
580 | }; | |
581 | ||
582 | #define NILFS_CPINFO_FNS(flag, name) \ | |
583 | static inline int \ | |
584 | nilfs_cpinfo_##name(const struct nilfs_cpinfo *cpinfo) \ | |
585 | { \ | |
586 | return !!(cpinfo->ci_flags & (1UL << NILFS_CHECKPOINT_##flag)); \ | |
587 | } | |
588 | ||
589 | NILFS_CPINFO_FNS(SNAPSHOT, snapshot) | |
590 | NILFS_CPINFO_FNS(INVALID, invalid) | |
c96fa464 | 591 | NILFS_CPINFO_FNS(MINOR, minor) |
eed10e39 KS |
592 | |
593 | ||
594 | /** | |
595 | * struct nilfs_cpfile_header - checkpoint file header | |
596 | * @ch_ncheckpoints: number of checkpoints | |
597 | * @ch_nsnapshots: number of snapshots | |
598 | * @ch_snapshot_list: snapshot list | |
599 | */ | |
600 | struct nilfs_cpfile_header { | |
601 | __le64 ch_ncheckpoints; | |
602 | __le64 ch_nsnapshots; | |
603 | struct nilfs_snapshot_list ch_snapshot_list; | |
604 | }; | |
605 | ||
606 | #define NILFS_CPFILE_FIRST_CHECKPOINT_OFFSET \ | |
607 | ((sizeof(struct nilfs_cpfile_header) + \ | |
608 | sizeof(struct nilfs_checkpoint) - 1) / \ | |
609 | sizeof(struct nilfs_checkpoint)) | |
610 | ||
611 | /** | |
612 | * struct nilfs_segment_usage - segment usage | |
613 | * @su_lastmod: last modified timestamp | |
614 | * @su_nblocks: number of blocks in segment | |
615 | * @su_flags: flags | |
616 | */ | |
617 | struct nilfs_segment_usage { | |
618 | __le64 su_lastmod; | |
619 | __le32 su_nblocks; | |
620 | __le32 su_flags; | |
621 | }; | |
622 | ||
623 | /* segment usage flag */ | |
624 | enum { | |
625 | NILFS_SEGMENT_USAGE_ACTIVE, | |
626 | NILFS_SEGMENT_USAGE_DIRTY, | |
627 | NILFS_SEGMENT_USAGE_ERROR, | |
628 | ||
eed10e39 KS |
629 | /* ... */ |
630 | }; | |
631 | ||
632 | #define NILFS_SEGMENT_USAGE_FNS(flag, name) \ | |
633 | static inline void \ | |
634 | nilfs_segment_usage_set_##name(struct nilfs_segment_usage *su) \ | |
635 | { \ | |
636 | su->su_flags = cpu_to_le32(le32_to_cpu(su->su_flags) | \ | |
637 | (1UL << NILFS_SEGMENT_USAGE_##flag));\ | |
638 | } \ | |
639 | static inline void \ | |
640 | nilfs_segment_usage_clear_##name(struct nilfs_segment_usage *su) \ | |
641 | { \ | |
642 | su->su_flags = \ | |
643 | cpu_to_le32(le32_to_cpu(su->su_flags) & \ | |
644 | ~(1UL << NILFS_SEGMENT_USAGE_##flag)); \ | |
645 | } \ | |
646 | static inline int \ | |
647 | nilfs_segment_usage_##name(const struct nilfs_segment_usage *su) \ | |
648 | { \ | |
649 | return !!(le32_to_cpu(su->su_flags) & \ | |
650 | (1UL << NILFS_SEGMENT_USAGE_##flag)); \ | |
651 | } | |
652 | ||
653 | NILFS_SEGMENT_USAGE_FNS(ACTIVE, active) | |
654 | NILFS_SEGMENT_USAGE_FNS(DIRTY, dirty) | |
655 | NILFS_SEGMENT_USAGE_FNS(ERROR, error) | |
eed10e39 KS |
656 | |
657 | static inline void | |
658 | nilfs_segment_usage_set_clean(struct nilfs_segment_usage *su) | |
659 | { | |
660 | su->su_lastmod = cpu_to_le64(0); | |
661 | su->su_nblocks = cpu_to_le32(0); | |
662 | su->su_flags = cpu_to_le32(0); | |
663 | } | |
664 | ||
665 | static inline int | |
666 | nilfs_segment_usage_clean(const struct nilfs_segment_usage *su) | |
667 | { | |
668 | return !le32_to_cpu(su->su_flags); | |
669 | } | |
670 | ||
671 | /** | |
672 | * struct nilfs_sufile_header - segment usage file header | |
673 | * @sh_ncleansegs: number of clean segments | |
674 | * @sh_ndirtysegs: number of dirty segments | |
675 | * @sh_last_alloc: last allocated segment number | |
676 | */ | |
677 | struct nilfs_sufile_header { | |
678 | __le64 sh_ncleansegs; | |
679 | __le64 sh_ndirtysegs; | |
680 | __le64 sh_last_alloc; | |
681 | /* ... */ | |
682 | }; | |
683 | ||
684 | #define NILFS_SUFILE_FIRST_SEGMENT_USAGE_OFFSET \ | |
685 | ((sizeof(struct nilfs_sufile_header) + \ | |
686 | sizeof(struct nilfs_segment_usage) - 1) / \ | |
687 | sizeof(struct nilfs_segment_usage)) | |
688 | ||
689 | /** | |
690 | * nilfs_suinfo - segment usage information | |
691 | * @sui_lastmod: | |
692 | * @sui_nblocks: | |
693 | * @sui_flags: | |
694 | */ | |
695 | struct nilfs_suinfo { | |
696 | __u64 sui_lastmod; | |
697 | __u32 sui_nblocks; | |
698 | __u32 sui_flags; | |
699 | }; | |
700 | ||
701 | #define NILFS_SUINFO_FNS(flag, name) \ | |
702 | static inline int \ | |
703 | nilfs_suinfo_##name(const struct nilfs_suinfo *si) \ | |
704 | { \ | |
705 | return si->sui_flags & (1UL << NILFS_SEGMENT_USAGE_##flag); \ | |
706 | } | |
707 | ||
708 | NILFS_SUINFO_FNS(ACTIVE, active) | |
709 | NILFS_SUINFO_FNS(DIRTY, dirty) | |
710 | NILFS_SUINFO_FNS(ERROR, error) | |
eed10e39 KS |
711 | |
712 | static inline int nilfs_suinfo_clean(const struct nilfs_suinfo *si) | |
713 | { | |
714 | return !si->sui_flags; | |
715 | } | |
716 | ||
717 | /* ioctl */ | |
718 | enum { | |
719 | NILFS_CHECKPOINT, | |
720 | NILFS_SNAPSHOT, | |
721 | }; | |
722 | ||
723 | /** | |
724 | * struct nilfs_cpmode - | |
725 | * @cc_cno: | |
726 | * @cc_mode: | |
727 | */ | |
728 | struct nilfs_cpmode { | |
729 | __u64 cm_cno; | |
dc498d09 RK |
730 | __u32 cm_mode; |
731 | __u32 cm_pad; | |
eed10e39 KS |
732 | }; |
733 | ||
734 | /** | |
735 | * struct nilfs_argv - argument vector | |
736 | * @v_base: | |
737 | * @v_nmembs: | |
738 | * @v_size: | |
eed10e39 | 739 | * @v_flags: |
dc498d09 | 740 | * @v_index: |
eed10e39 KS |
741 | */ |
742 | struct nilfs_argv { | |
dc498d09 RK |
743 | __u64 v_base; |
744 | __u32 v_nmembs; /* number of members */ | |
745 | __u16 v_size; /* size of members */ | |
746 | __u16 v_flags; | |
747 | __u64 v_index; | |
eed10e39 KS |
748 | }; |
749 | ||
750 | /** | |
751 | * struct nilfs_period - | |
752 | * @p_start: | |
753 | * @p_end: | |
754 | */ | |
755 | struct nilfs_period { | |
756 | __u64 p_start; | |
757 | __u64 p_end; | |
758 | }; | |
759 | ||
760 | /** | |
761 | * struct nilfs_cpstat - | |
762 | * @cs_cno: checkpoint number | |
763 | * @cs_ncps: number of checkpoints | |
764 | * @cs_nsss: number of snapshots | |
765 | */ | |
766 | struct nilfs_cpstat { | |
767 | __u64 cs_cno; | |
768 | __u64 cs_ncps; | |
769 | __u64 cs_nsss; | |
770 | }; | |
771 | ||
772 | /** | |
773 | * struct nilfs_sustat - | |
774 | * @ss_nsegs: number of segments | |
775 | * @ss_ncleansegs: number of clean segments | |
776 | * @ss_ndirtysegs: number of dirty segments | |
2c2e52fc RK |
777 | * @ss_ctime: creation time of the last segment |
778 | * @ss_nongc_ctime: creation time of the last segment not for GC | |
779 | * @ss_prot_seq: least sequence number of segments which must not be reclaimed | |
eed10e39 KS |
780 | */ |
781 | struct nilfs_sustat { | |
782 | __u64 ss_nsegs; | |
783 | __u64 ss_ncleansegs; | |
784 | __u64 ss_ndirtysegs; | |
dc498d09 RK |
785 | __u64 ss_ctime; |
786 | __u64 ss_nongc_ctime; | |
2c2e52fc | 787 | __u64 ss_prot_seq; |
eed10e39 KS |
788 | }; |
789 | ||
790 | /** | |
791 | * struct nilfs_vinfo - virtual block number information | |
792 | * @vi_vblocknr: | |
793 | * @vi_start: | |
794 | * @vi_end: | |
795 | * @vi_blocknr: | |
796 | */ | |
797 | struct nilfs_vinfo { | |
798 | __u64 vi_vblocknr; | |
799 | __u64 vi_start; | |
800 | __u64 vi_end; | |
801 | __u64 vi_blocknr; | |
802 | }; | |
803 | ||
804 | /** | |
805 | * struct nilfs_vdesc - | |
806 | */ | |
807 | struct nilfs_vdesc { | |
808 | __u64 vd_ino; | |
809 | __u64 vd_cno; | |
810 | __u64 vd_vblocknr; | |
811 | struct nilfs_period vd_period; | |
812 | __u64 vd_blocknr; | |
813 | __u64 vd_offset; | |
814 | __u32 vd_flags; | |
dc498d09 | 815 | __u32 vd_pad; |
eed10e39 KS |
816 | }; |
817 | ||
818 | /** | |
819 | * struct nilfs_bdesc - | |
820 | */ | |
821 | struct nilfs_bdesc { | |
822 | __u64 bd_ino; | |
823 | __u64 bd_oblocknr; | |
824 | __u64 bd_blocknr; | |
825 | __u64 bd_offset; | |
826 | __u32 bd_level; | |
dc498d09 | 827 | __u32 bd_pad; |
eed10e39 KS |
828 | }; |
829 | ||
eed10e39 KS |
830 | #define NILFS_IOCTL_IDENT 'n' |
831 | ||
832 | #define NILFS_IOCTL_CHANGE_CPMODE \ | |
833 | _IOW(NILFS_IOCTL_IDENT, 0x80, struct nilfs_cpmode) | |
834 | #define NILFS_IOCTL_DELETE_CHECKPOINT \ | |
835 | _IOW(NILFS_IOCTL_IDENT, 0x81, __u64) | |
836 | #define NILFS_IOCTL_GET_CPINFO \ | |
837 | _IOR(NILFS_IOCTL_IDENT, 0x82, struct nilfs_argv) | |
838 | #define NILFS_IOCTL_GET_CPSTAT \ | |
839 | _IOR(NILFS_IOCTL_IDENT, 0x83, struct nilfs_cpstat) | |
840 | #define NILFS_IOCTL_GET_SUINFO \ | |
841 | _IOR(NILFS_IOCTL_IDENT, 0x84, struct nilfs_argv) | |
842 | #define NILFS_IOCTL_GET_SUSTAT \ | |
843 | _IOR(NILFS_IOCTL_IDENT, 0x85, struct nilfs_sustat) | |
844 | #define NILFS_IOCTL_GET_VINFO \ | |
845 | _IOWR(NILFS_IOCTL_IDENT, 0x86, struct nilfs_argv) | |
846 | #define NILFS_IOCTL_GET_BDESCS \ | |
847 | _IOWR(NILFS_IOCTL_IDENT, 0x87, struct nilfs_argv) | |
848 | #define NILFS_IOCTL_CLEAN_SEGMENTS \ | |
849 | _IOW(NILFS_IOCTL_IDENT, 0x88, struct nilfs_argv[5]) | |
eed10e39 KS |
850 | #define NILFS_IOCTL_SYNC \ |
851 | _IOR(NILFS_IOCTL_IDENT, 0x8A, __u64) | |
852 | #define NILFS_IOCTL_RESIZE \ | |
853 | _IOW(NILFS_IOCTL_IDENT, 0x8B, __u64) | |
854 | ||
eed10e39 | 855 | #endif /* _LINUX_NILFS_FS_H */ |