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57926640 CH |
1 | /* |
2 | * Copyright (c) 2000-2001,2005 Silicon Graphics, Inc. | |
f5f3d9b0 | 3 | * Copyright (c) 2013 Red Hat, Inc. |
57926640 CH |
4 | * All Rights Reserved. |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU General Public License as | |
8 | * published by the Free Software Foundation. | |
9 | * | |
10 | * This program is distributed in the hope that it would be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License | |
16 | * along with this program; if not, write the Free Software Foundation, | |
17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
18 | */ | |
19 | #ifndef __XFS_DIR2_FORMAT_H__ | |
20 | #define __XFS_DIR2_FORMAT_H__ | |
21 | ||
22 | /* | |
23 | * Directory version 2. | |
24 | * | |
25 | * There are 4 possible formats: | |
26 | * - shortform - embedded into the inode | |
27 | * - single block - data with embedded leaf at the end | |
28 | * - multiple data blocks, single leaf+freeindex block | |
29 | * - data blocks, node and leaf blocks (btree), freeindex blocks | |
30 | * | |
31 | * Note: many node blocks structures and constants are shared with the attr | |
32 | * code and defined in xfs_da_btree.h. | |
33 | */ | |
34 | ||
35 | #define XFS_DIR2_BLOCK_MAGIC 0x58443242 /* XD2B: single block dirs */ | |
36 | #define XFS_DIR2_DATA_MAGIC 0x58443244 /* XD2D: multiblock dirs */ | |
37 | #define XFS_DIR2_FREE_MAGIC 0x58443246 /* XD2F: free index blocks */ | |
38 | ||
f5f3d9b0 DC |
39 | /* |
40 | * Directory Version 3 With CRCs. | |
41 | * | |
42 | * The tree formats are the same as for version 2 directories. The difference | |
43 | * is in the block header and dirent formats. In many cases the v3 structures | |
44 | * use v2 definitions as they are no different and this makes code sharing much | |
45 | * easier. | |
46 | * | |
47 | * Also, the xfs_dir3_*() functions handle both v2 and v3 formats - if the | |
48 | * format is v2 then they switch to the existing v2 code, or the format is v3 | |
49 | * they implement the v3 functionality. This means the existing dir2 is a mix of | |
50 | * xfs_dir2/xfs_dir3 calls and functions. The xfs_dir3 functions are called | |
51 | * where there is a difference in the formats, otherwise the code is unchanged. | |
52 | * | |
53 | * Where it is possible, the code decides what to do based on the magic numbers | |
54 | * in the blocks rather than feature bits in the superblock. This means the code | |
55 | * is as independent of the external XFS code as possible as doesn't require | |
56 | * passing struct xfs_mount pointers into places where it isn't really | |
57 | * necessary. | |
58 | * | |
59 | * Version 3 includes: | |
60 | * | |
61 | * - a larger block header for CRC and identification purposes and so the | |
62 | * offsets of all the structures inside the blocks are different. | |
63 | * | |
64 | * - new magic numbers to be able to detect the v2/v3 types on the fly. | |
65 | */ | |
66 | ||
67 | #define XFS_DIR3_BLOCK_MAGIC 0x58444233 /* XDB3: single block dirs */ | |
68 | #define XFS_DIR3_DATA_MAGIC 0x58444433 /* XDD3: multiblock dirs */ | |
cbc8adf8 | 69 | #define XFS_DIR3_FREE_MAGIC 0x58444633 /* XDF3: free index blocks */ |
f5f3d9b0 | 70 | |
57926640 CH |
71 | /* |
72 | * Byte offset in data block and shortform entry. | |
73 | */ | |
74 | typedef __uint16_t xfs_dir2_data_off_t; | |
75 | #define NULLDATAOFF 0xffffU | |
76 | typedef uint xfs_dir2_data_aoff_t; /* argument form */ | |
77 | ||
78 | /* | |
79 | * Normalized offset (in a data block) of the entry, really xfs_dir2_data_off_t. | |
80 | * Only need 16 bits, this is the byte offset into the single block form. | |
81 | */ | |
82 | typedef struct { __uint8_t i[2]; } __arch_pack xfs_dir2_sf_off_t; | |
83 | ||
84 | /* | |
85 | * Offset in data space of a data entry. | |
86 | */ | |
87 | typedef __uint32_t xfs_dir2_dataptr_t; | |
88 | #define XFS_DIR2_MAX_DATAPTR ((xfs_dir2_dataptr_t)0xffffffff) | |
89 | #define XFS_DIR2_NULL_DATAPTR ((xfs_dir2_dataptr_t)0) | |
90 | ||
91 | /* | |
92 | * Byte offset in a directory. | |
93 | */ | |
94 | typedef xfs_off_t xfs_dir2_off_t; | |
95 | ||
96 | /* | |
97 | * Directory block number (logical dirblk in file) | |
98 | */ | |
99 | typedef __uint32_t xfs_dir2_db_t; | |
100 | ||
101 | /* | |
102 | * Inode number stored as 8 8-bit values. | |
103 | */ | |
104 | typedef struct { __uint8_t i[8]; } xfs_dir2_ino8_t; | |
105 | ||
106 | /* | |
107 | * Inode number stored as 4 8-bit values. | |
108 | * Works a lot of the time, when all the inode numbers in a directory | |
109 | * fit in 32 bits. | |
110 | */ | |
111 | typedef struct { __uint8_t i[4]; } xfs_dir2_ino4_t; | |
112 | ||
113 | typedef union { | |
114 | xfs_dir2_ino8_t i8; | |
115 | xfs_dir2_ino4_t i4; | |
116 | } xfs_dir2_inou_t; | |
117 | #define XFS_DIR2_MAX_SHORT_INUM ((xfs_ino_t)0xffffffffULL) | |
118 | ||
119 | /* | |
120 | * Directory layout when stored internal to an inode. | |
121 | * | |
122 | * Small directories are packed as tightly as possible so as to fit into the | |
123 | * literal area of the inode. These "shortform" directories consist of a | |
124 | * single xfs_dir2_sf_hdr header followed by zero or more xfs_dir2_sf_entry | |
125 | * structures. Due the different inode number storage size and the variable | |
126 | * length name field in the xfs_dir2_sf_entry all these structure are | |
127 | * variable length, and the accessors in this file should be used to iterate | |
128 | * over them. | |
129 | */ | |
130 | typedef struct xfs_dir2_sf_hdr { | |
131 | __uint8_t count; /* count of entries */ | |
132 | __uint8_t i8count; /* count of 8-byte inode #s */ | |
133 | xfs_dir2_inou_t parent; /* parent dir inode number */ | |
134 | } __arch_pack xfs_dir2_sf_hdr_t; | |
135 | ||
136 | typedef struct xfs_dir2_sf_entry { | |
137 | __u8 namelen; /* actual name length */ | |
138 | xfs_dir2_sf_off_t offset; /* saved offset */ | |
139 | __u8 name[]; /* name, variable size */ | |
140 | /* | |
141 | * A xfs_dir2_ino8_t or xfs_dir2_ino4_t follows here, at a | |
142 | * variable offset after the name. | |
143 | */ | |
144 | } __arch_pack xfs_dir2_sf_entry_t; | |
145 | ||
146 | static inline int xfs_dir2_sf_hdr_size(int i8count) | |
147 | { | |
148 | return sizeof(struct xfs_dir2_sf_hdr) - | |
149 | (i8count == 0) * | |
150 | (sizeof(xfs_dir2_ino8_t) - sizeof(xfs_dir2_ino4_t)); | |
151 | } | |
152 | ||
153 | static inline xfs_dir2_data_aoff_t | |
154 | xfs_dir2_sf_get_offset(xfs_dir2_sf_entry_t *sfep) | |
155 | { | |
156 | return get_unaligned_be16(&sfep->offset.i); | |
157 | } | |
158 | ||
159 | static inline void | |
160 | xfs_dir2_sf_put_offset(xfs_dir2_sf_entry_t *sfep, xfs_dir2_data_aoff_t off) | |
161 | { | |
162 | put_unaligned_be16(off, &sfep->offset.i); | |
163 | } | |
164 | ||
165 | static inline int | |
166 | xfs_dir2_sf_entsize(struct xfs_dir2_sf_hdr *hdr, int len) | |
167 | { | |
168 | return sizeof(struct xfs_dir2_sf_entry) + /* namelen + offset */ | |
169 | len + /* name */ | |
170 | (hdr->i8count ? /* ino */ | |
171 | sizeof(xfs_dir2_ino8_t) : | |
172 | sizeof(xfs_dir2_ino4_t)); | |
173 | } | |
174 | ||
175 | static inline struct xfs_dir2_sf_entry * | |
176 | xfs_dir2_sf_firstentry(struct xfs_dir2_sf_hdr *hdr) | |
177 | { | |
178 | return (struct xfs_dir2_sf_entry *) | |
179 | ((char *)hdr + xfs_dir2_sf_hdr_size(hdr->i8count)); | |
180 | } | |
181 | ||
182 | static inline struct xfs_dir2_sf_entry * | |
183 | xfs_dir2_sf_nextentry(struct xfs_dir2_sf_hdr *hdr, | |
184 | struct xfs_dir2_sf_entry *sfep) | |
185 | { | |
186 | return (struct xfs_dir2_sf_entry *) | |
187 | ((char *)sfep + xfs_dir2_sf_entsize(hdr, sfep->namelen)); | |
188 | } | |
189 | ||
190 | ||
191 | /* | |
192 | * Data block structures. | |
193 | * | |
194 | * A pure data block looks like the following drawing on disk: | |
195 | * | |
196 | * +-------------------------------------------------+ | |
197 | * | xfs_dir2_data_hdr_t | | |
198 | * +-------------------------------------------------+ | |
199 | * | xfs_dir2_data_entry_t OR xfs_dir2_data_unused_t | | |
200 | * | xfs_dir2_data_entry_t OR xfs_dir2_data_unused_t | | |
201 | * | xfs_dir2_data_entry_t OR xfs_dir2_data_unused_t | | |
202 | * | ... | | |
203 | * +-------------------------------------------------+ | |
204 | * | unused space | | |
205 | * +-------------------------------------------------+ | |
206 | * | |
207 | * As all the entries are variable size structures the accessors below should | |
208 | * be used to iterate over them. | |
209 | * | |
210 | * In addition to the pure data blocks for the data and node formats, | |
211 | * most structures are also used for the combined data/freespace "block" | |
212 | * format below. | |
213 | */ | |
214 | ||
215 | #define XFS_DIR2_DATA_ALIGN_LOG 3 /* i.e., 8 bytes */ | |
216 | #define XFS_DIR2_DATA_ALIGN (1 << XFS_DIR2_DATA_ALIGN_LOG) | |
217 | #define XFS_DIR2_DATA_FREE_TAG 0xffff | |
218 | #define XFS_DIR2_DATA_FD_COUNT 3 | |
219 | ||
220 | /* | |
221 | * Directory address space divided into sections, | |
222 | * spaces separated by 32GB. | |
223 | */ | |
224 | #define XFS_DIR2_SPACE_SIZE (1ULL << (32 + XFS_DIR2_DATA_ALIGN_LOG)) | |
225 | #define XFS_DIR2_DATA_SPACE 0 | |
226 | #define XFS_DIR2_DATA_OFFSET (XFS_DIR2_DATA_SPACE * XFS_DIR2_SPACE_SIZE) | |
227 | #define XFS_DIR2_DATA_FIRSTDB(mp) \ | |
228 | xfs_dir2_byte_to_db(mp, XFS_DIR2_DATA_OFFSET) | |
229 | ||
230 | /* | |
231 | * Offsets of . and .. in data space (always block 0) | |
232 | */ | |
233 | #define XFS_DIR2_DATA_DOT_OFFSET \ | |
234 | ((xfs_dir2_data_aoff_t)sizeof(struct xfs_dir2_data_hdr)) | |
235 | #define XFS_DIR2_DATA_DOTDOT_OFFSET \ | |
236 | (XFS_DIR2_DATA_DOT_OFFSET + xfs_dir2_data_entsize(1)) | |
237 | #define XFS_DIR2_DATA_FIRST_OFFSET \ | |
238 | (XFS_DIR2_DATA_DOTDOT_OFFSET + xfs_dir2_data_entsize(2)) | |
239 | ||
240 | /* | |
241 | * Describe a free area in the data block. | |
242 | * | |
243 | * The freespace will be formatted as a xfs_dir2_data_unused_t. | |
244 | */ | |
245 | typedef struct xfs_dir2_data_free { | |
246 | __be16 offset; /* start of freespace */ | |
247 | __be16 length; /* length of freespace */ | |
248 | } xfs_dir2_data_free_t; | |
249 | ||
250 | /* | |
251 | * Header for the data blocks. | |
252 | * | |
253 | * The code knows that XFS_DIR2_DATA_FD_COUNT is 3. | |
254 | */ | |
255 | typedef struct xfs_dir2_data_hdr { | |
256 | __be32 magic; /* XFS_DIR2_DATA_MAGIC or */ | |
257 | /* XFS_DIR2_BLOCK_MAGIC */ | |
258 | xfs_dir2_data_free_t bestfree[XFS_DIR2_DATA_FD_COUNT]; | |
259 | } xfs_dir2_data_hdr_t; | |
260 | ||
f5f3d9b0 DC |
261 | /* |
262 | * define a structure for all the verification fields we are adding to the | |
263 | * directory block structures. This will be used in several structures. | |
264 | * The magic number must be the first entry to align with all the dir2 | |
265 | * structures so we determine how to decode them just by the magic number. | |
266 | */ | |
267 | struct xfs_dir3_blk_hdr { | |
268 | __be32 magic; /* magic number */ | |
269 | __be32 crc; /* CRC of block */ | |
270 | __be64 blkno; /* first block of the buffer */ | |
271 | __be64 lsn; /* sequence number of last write */ | |
272 | uuid_t uuid; /* filesystem we belong to */ | |
273 | __be64 owner; /* inode that owns the block */ | |
274 | }; | |
275 | ||
276 | struct xfs_dir3_data_hdr { | |
277 | struct xfs_dir3_blk_hdr hdr; | |
278 | xfs_dir2_data_free_t best_free[XFS_DIR2_DATA_FD_COUNT]; | |
279 | }; | |
280 | ||
281 | #define XFS_DIR3_DATA_CRC_OFF offsetof(struct xfs_dir3_data_hdr, hdr.crc) | |
282 | ||
283 | static inline struct xfs_dir2_data_free * | |
284 | xfs_dir3_data_bestfree_p(struct xfs_dir2_data_hdr *hdr) | |
285 | { | |
33363fee DC |
286 | if (hdr->magic == cpu_to_be32(XFS_DIR3_DATA_MAGIC) || |
287 | hdr->magic == cpu_to_be32(XFS_DIR3_BLOCK_MAGIC)) { | |
f5f3d9b0 DC |
288 | struct xfs_dir3_data_hdr *hdr3 = (struct xfs_dir3_data_hdr *)hdr; |
289 | return hdr3->best_free; | |
290 | } | |
291 | return hdr->bestfree; | |
292 | } | |
293 | ||
57926640 CH |
294 | /* |
295 | * Active entry in a data block. | |
296 | * | |
297 | * Aligned to 8 bytes. After the variable length name field there is a | |
298 | * 2 byte tag field, which can be accessed using xfs_dir2_data_entry_tag_p. | |
299 | */ | |
300 | typedef struct xfs_dir2_data_entry { | |
301 | __be64 inumber; /* inode number */ | |
302 | __u8 namelen; /* name length */ | |
303 | __u8 name[]; /* name bytes, no null */ | |
304 | /* __be16 tag; */ /* starting offset of us */ | |
305 | } xfs_dir2_data_entry_t; | |
306 | ||
307 | /* | |
308 | * Unused entry in a data block. | |
309 | * | |
310 | * Aligned to 8 bytes. Tag appears as the last 2 bytes and must be accessed | |
311 | * using xfs_dir2_data_unused_tag_p. | |
312 | */ | |
313 | typedef struct xfs_dir2_data_unused { | |
314 | __be16 freetag; /* XFS_DIR2_DATA_FREE_TAG */ | |
315 | __be16 length; /* total free length */ | |
316 | /* variable offset */ | |
317 | __be16 tag; /* starting offset of us */ | |
318 | } xfs_dir2_data_unused_t; | |
319 | ||
320 | /* | |
321 | * Size of a data entry. | |
322 | */ | |
323 | static inline int xfs_dir2_data_entsize(int n) | |
324 | { | |
325 | return (int)roundup(offsetof(struct xfs_dir2_data_entry, name[0]) + n + | |
326 | (uint)sizeof(xfs_dir2_data_off_t), XFS_DIR2_DATA_ALIGN); | |
327 | } | |
328 | ||
329 | /* | |
330 | * Pointer to an entry's tag word. | |
331 | */ | |
332 | static inline __be16 * | |
333 | xfs_dir2_data_entry_tag_p(struct xfs_dir2_data_entry *dep) | |
334 | { | |
335 | return (__be16 *)((char *)dep + | |
336 | xfs_dir2_data_entsize(dep->namelen) - sizeof(__be16)); | |
337 | } | |
338 | ||
339 | /* | |
340 | * Pointer to a freespace's tag word. | |
341 | */ | |
342 | static inline __be16 * | |
343 | xfs_dir2_data_unused_tag_p(struct xfs_dir2_data_unused *dup) | |
344 | { | |
345 | return (__be16 *)((char *)dup + | |
346 | be16_to_cpu(dup->length) - sizeof(__be16)); | |
347 | } | |
348 | ||
f5f3d9b0 DC |
349 | static inline size_t |
350 | xfs_dir3_data_hdr_size(bool dir3) | |
351 | { | |
352 | if (dir3) | |
353 | return sizeof(struct xfs_dir3_data_hdr); | |
354 | return sizeof(struct xfs_dir2_data_hdr); | |
355 | } | |
356 | ||
357 | static inline size_t | |
358 | xfs_dir3_data_entry_offset(struct xfs_dir2_data_hdr *hdr) | |
359 | { | |
360 | bool dir3 = hdr->magic == cpu_to_be32(XFS_DIR3_DATA_MAGIC) || | |
361 | hdr->magic == cpu_to_be32(XFS_DIR3_BLOCK_MAGIC); | |
362 | return xfs_dir3_data_hdr_size(dir3); | |
363 | } | |
364 | ||
365 | static inline struct xfs_dir2_data_entry * | |
366 | xfs_dir3_data_entry_p(struct xfs_dir2_data_hdr *hdr) | |
367 | { | |
368 | return (struct xfs_dir2_data_entry *) | |
369 | ((char *)hdr + xfs_dir3_data_entry_offset(hdr)); | |
370 | } | |
371 | ||
33363fee DC |
372 | static inline struct xfs_dir2_data_unused * |
373 | xfs_dir3_data_unused_p(struct xfs_dir2_data_hdr *hdr) | |
374 | { | |
375 | return (struct xfs_dir2_data_unused *) | |
376 | ((char *)hdr + xfs_dir3_data_entry_offset(hdr)); | |
377 | } | |
378 | ||
f5f3d9b0 DC |
379 | /* |
380 | * Offsets of . and .. in data space (always block 0) | |
381 | */ | |
382 | static inline xfs_dir2_data_aoff_t | |
383 | xfs_dir3_data_dot_offset(struct xfs_dir2_data_hdr *hdr) | |
384 | { | |
385 | return xfs_dir3_data_entry_offset(hdr); | |
386 | } | |
387 | ||
388 | static inline xfs_dir2_data_aoff_t | |
389 | xfs_dir3_data_dotdot_offset(struct xfs_dir2_data_hdr *hdr) | |
390 | { | |
391 | return xfs_dir3_data_dot_offset(hdr) + xfs_dir2_data_entsize(1); | |
392 | } | |
393 | ||
394 | static inline xfs_dir2_data_aoff_t | |
395 | xfs_dir3_data_first_offset(struct xfs_dir2_data_hdr *hdr) | |
396 | { | |
397 | return xfs_dir3_data_dotdot_offset(hdr) + xfs_dir2_data_entsize(2); | |
398 | } | |
399 | ||
400 | /* | |
401 | * location of . and .. in data space (always block 0) | |
402 | */ | |
403 | static inline struct xfs_dir2_data_entry * | |
404 | xfs_dir3_data_dot_entry_p(struct xfs_dir2_data_hdr *hdr) | |
405 | { | |
406 | return (struct xfs_dir2_data_entry *) | |
407 | ((char *)hdr + xfs_dir3_data_dot_offset(hdr)); | |
408 | } | |
409 | ||
410 | static inline struct xfs_dir2_data_entry * | |
411 | xfs_dir3_data_dotdot_entry_p(struct xfs_dir2_data_hdr *hdr) | |
412 | { | |
413 | return (struct xfs_dir2_data_entry *) | |
414 | ((char *)hdr + xfs_dir3_data_dotdot_offset(hdr)); | |
415 | } | |
416 | ||
417 | static inline struct xfs_dir2_data_entry * | |
418 | xfs_dir3_data_first_entry_p(struct xfs_dir2_data_hdr *hdr) | |
419 | { | |
420 | return (struct xfs_dir2_data_entry *) | |
421 | ((char *)hdr + xfs_dir3_data_first_offset(hdr)); | |
422 | } | |
423 | ||
57926640 CH |
424 | /* |
425 | * Leaf block structures. | |
426 | * | |
427 | * A pure leaf block looks like the following drawing on disk: | |
428 | * | |
429 | * +---------------------------+ | |
430 | * | xfs_dir2_leaf_hdr_t | | |
431 | * +---------------------------+ | |
432 | * | xfs_dir2_leaf_entry_t | | |
433 | * | xfs_dir2_leaf_entry_t | | |
434 | * | xfs_dir2_leaf_entry_t | | |
435 | * | xfs_dir2_leaf_entry_t | | |
436 | * | ... | | |
437 | * +---------------------------+ | |
438 | * | xfs_dir2_data_off_t | | |
439 | * | xfs_dir2_data_off_t | | |
440 | * | xfs_dir2_data_off_t | | |
441 | * | ... | | |
442 | * +---------------------------+ | |
443 | * | xfs_dir2_leaf_tail_t | | |
444 | * +---------------------------+ | |
445 | * | |
446 | * The xfs_dir2_data_off_t members (bests) and tail are at the end of the block | |
447 | * for single-leaf (magic = XFS_DIR2_LEAF1_MAGIC) blocks only, but not present | |
448 | * for directories with separate leaf nodes and free space blocks | |
449 | * (magic = XFS_DIR2_LEAFN_MAGIC). | |
450 | * | |
451 | * As all the entries are variable size structures the accessors below should | |
452 | * be used to iterate over them. | |
453 | */ | |
454 | ||
455 | /* | |
456 | * Offset of the leaf/node space. First block in this space | |
457 | * is the btree root. | |
458 | */ | |
459 | #define XFS_DIR2_LEAF_SPACE 1 | |
460 | #define XFS_DIR2_LEAF_OFFSET (XFS_DIR2_LEAF_SPACE * XFS_DIR2_SPACE_SIZE) | |
461 | #define XFS_DIR2_LEAF_FIRSTDB(mp) \ | |
462 | xfs_dir2_byte_to_db(mp, XFS_DIR2_LEAF_OFFSET) | |
463 | ||
464 | /* | |
465 | * Leaf block header. | |
466 | */ | |
467 | typedef struct xfs_dir2_leaf_hdr { | |
468 | xfs_da_blkinfo_t info; /* header for da routines */ | |
469 | __be16 count; /* count of entries */ | |
470 | __be16 stale; /* count of stale entries */ | |
471 | } xfs_dir2_leaf_hdr_t; | |
472 | ||
473 | /* | |
474 | * Leaf block entry. | |
475 | */ | |
476 | typedef struct xfs_dir2_leaf_entry { | |
477 | __be32 hashval; /* hash value of name */ | |
478 | __be32 address; /* address of data entry */ | |
479 | } xfs_dir2_leaf_entry_t; | |
480 | ||
481 | /* | |
482 | * Leaf block tail. | |
483 | */ | |
484 | typedef struct xfs_dir2_leaf_tail { | |
485 | __be32 bestcount; | |
486 | } xfs_dir2_leaf_tail_t; | |
487 | ||
488 | /* | |
489 | * Leaf block. | |
490 | */ | |
491 | typedef struct xfs_dir2_leaf { | |
492 | xfs_dir2_leaf_hdr_t hdr; /* leaf header */ | |
493 | xfs_dir2_leaf_entry_t ents[]; /* entries */ | |
494 | } xfs_dir2_leaf_t; | |
495 | ||
496 | /* | |
497 | * DB blocks here are logical directory block numbers, not filesystem blocks. | |
498 | */ | |
499 | ||
500 | static inline int xfs_dir2_max_leaf_ents(struct xfs_mount *mp) | |
501 | { | |
502 | return (mp->m_dirblksize - (uint)sizeof(struct xfs_dir2_leaf_hdr)) / | |
503 | (uint)sizeof(struct xfs_dir2_leaf_entry); | |
504 | } | |
505 | ||
506 | /* | |
507 | * Get address of the bestcount field in the single-leaf block. | |
508 | */ | |
509 | static inline struct xfs_dir2_leaf_tail * | |
510 | xfs_dir2_leaf_tail_p(struct xfs_mount *mp, struct xfs_dir2_leaf *lp) | |
511 | { | |
512 | return (struct xfs_dir2_leaf_tail *) | |
513 | ((char *)lp + mp->m_dirblksize - | |
514 | sizeof(struct xfs_dir2_leaf_tail)); | |
515 | } | |
516 | ||
517 | /* | |
518 | * Get address of the bests array in the single-leaf block. | |
519 | */ | |
520 | static inline __be16 * | |
521 | xfs_dir2_leaf_bests_p(struct xfs_dir2_leaf_tail *ltp) | |
522 | { | |
523 | return (__be16 *)ltp - be32_to_cpu(ltp->bestcount); | |
524 | } | |
525 | ||
526 | /* | |
527 | * Convert dataptr to byte in file space | |
528 | */ | |
529 | static inline xfs_dir2_off_t | |
530 | xfs_dir2_dataptr_to_byte(struct xfs_mount *mp, xfs_dir2_dataptr_t dp) | |
531 | { | |
532 | return (xfs_dir2_off_t)dp << XFS_DIR2_DATA_ALIGN_LOG; | |
533 | } | |
534 | ||
535 | /* | |
536 | * Convert byte in file space to dataptr. It had better be aligned. | |
537 | */ | |
538 | static inline xfs_dir2_dataptr_t | |
539 | xfs_dir2_byte_to_dataptr(struct xfs_mount *mp, xfs_dir2_off_t by) | |
540 | { | |
541 | return (xfs_dir2_dataptr_t)(by >> XFS_DIR2_DATA_ALIGN_LOG); | |
542 | } | |
543 | ||
544 | /* | |
545 | * Convert byte in space to (DB) block | |
546 | */ | |
547 | static inline xfs_dir2_db_t | |
548 | xfs_dir2_byte_to_db(struct xfs_mount *mp, xfs_dir2_off_t by) | |
549 | { | |
550 | return (xfs_dir2_db_t) | |
551 | (by >> (mp->m_sb.sb_blocklog + mp->m_sb.sb_dirblklog)); | |
552 | } | |
553 | ||
554 | /* | |
555 | * Convert dataptr to a block number | |
556 | */ | |
557 | static inline xfs_dir2_db_t | |
558 | xfs_dir2_dataptr_to_db(struct xfs_mount *mp, xfs_dir2_dataptr_t dp) | |
559 | { | |
560 | return xfs_dir2_byte_to_db(mp, xfs_dir2_dataptr_to_byte(mp, dp)); | |
561 | } | |
562 | ||
563 | /* | |
564 | * Convert byte in space to offset in a block | |
565 | */ | |
566 | static inline xfs_dir2_data_aoff_t | |
567 | xfs_dir2_byte_to_off(struct xfs_mount *mp, xfs_dir2_off_t by) | |
568 | { | |
569 | return (xfs_dir2_data_aoff_t)(by & | |
570 | ((1 << (mp->m_sb.sb_blocklog + mp->m_sb.sb_dirblklog)) - 1)); | |
571 | } | |
572 | ||
573 | /* | |
574 | * Convert dataptr to a byte offset in a block | |
575 | */ | |
576 | static inline xfs_dir2_data_aoff_t | |
577 | xfs_dir2_dataptr_to_off(struct xfs_mount *mp, xfs_dir2_dataptr_t dp) | |
578 | { | |
579 | return xfs_dir2_byte_to_off(mp, xfs_dir2_dataptr_to_byte(mp, dp)); | |
580 | } | |
581 | ||
582 | /* | |
583 | * Convert block and offset to byte in space | |
584 | */ | |
585 | static inline xfs_dir2_off_t | |
586 | xfs_dir2_db_off_to_byte(struct xfs_mount *mp, xfs_dir2_db_t db, | |
587 | xfs_dir2_data_aoff_t o) | |
588 | { | |
589 | return ((xfs_dir2_off_t)db << | |
590 | (mp->m_sb.sb_blocklog + mp->m_sb.sb_dirblklog)) + o; | |
591 | } | |
592 | ||
593 | /* | |
594 | * Convert block (DB) to block (dablk) | |
595 | */ | |
596 | static inline xfs_dablk_t | |
597 | xfs_dir2_db_to_da(struct xfs_mount *mp, xfs_dir2_db_t db) | |
598 | { | |
599 | return (xfs_dablk_t)(db << mp->m_sb.sb_dirblklog); | |
600 | } | |
601 | ||
602 | /* | |
603 | * Convert byte in space to (DA) block | |
604 | */ | |
605 | static inline xfs_dablk_t | |
606 | xfs_dir2_byte_to_da(struct xfs_mount *mp, xfs_dir2_off_t by) | |
607 | { | |
608 | return xfs_dir2_db_to_da(mp, xfs_dir2_byte_to_db(mp, by)); | |
609 | } | |
610 | ||
611 | /* | |
612 | * Convert block and offset to dataptr | |
613 | */ | |
614 | static inline xfs_dir2_dataptr_t | |
615 | xfs_dir2_db_off_to_dataptr(struct xfs_mount *mp, xfs_dir2_db_t db, | |
616 | xfs_dir2_data_aoff_t o) | |
617 | { | |
618 | return xfs_dir2_byte_to_dataptr(mp, xfs_dir2_db_off_to_byte(mp, db, o)); | |
619 | } | |
620 | ||
621 | /* | |
622 | * Convert block (dablk) to block (DB) | |
623 | */ | |
624 | static inline xfs_dir2_db_t | |
625 | xfs_dir2_da_to_db(struct xfs_mount *mp, xfs_dablk_t da) | |
626 | { | |
627 | return (xfs_dir2_db_t)(da >> mp->m_sb.sb_dirblklog); | |
628 | } | |
629 | ||
630 | /* | |
631 | * Convert block (dablk) to byte offset in space | |
632 | */ | |
633 | static inline xfs_dir2_off_t | |
634 | xfs_dir2_da_to_byte(struct xfs_mount *mp, xfs_dablk_t da) | |
635 | { | |
636 | return xfs_dir2_db_off_to_byte(mp, xfs_dir2_da_to_db(mp, da), 0); | |
637 | } | |
638 | ||
639 | /* | |
640 | * Free space block defintions for the node format. | |
641 | */ | |
642 | ||
643 | /* | |
644 | * Offset of the freespace index. | |
645 | */ | |
646 | #define XFS_DIR2_FREE_SPACE 2 | |
647 | #define XFS_DIR2_FREE_OFFSET (XFS_DIR2_FREE_SPACE * XFS_DIR2_SPACE_SIZE) | |
648 | #define XFS_DIR2_FREE_FIRSTDB(mp) \ | |
649 | xfs_dir2_byte_to_db(mp, XFS_DIR2_FREE_OFFSET) | |
650 | ||
651 | typedef struct xfs_dir2_free_hdr { | |
652 | __be32 magic; /* XFS_DIR2_FREE_MAGIC */ | |
653 | __be32 firstdb; /* db of first entry */ | |
654 | __be32 nvalid; /* count of valid entries */ | |
655 | __be32 nused; /* count of used entries */ | |
656 | } xfs_dir2_free_hdr_t; | |
657 | ||
658 | typedef struct xfs_dir2_free { | |
659 | xfs_dir2_free_hdr_t hdr; /* block header */ | |
a00b7745 | 660 | __be16 bests[]; /* best free counts */ |
57926640 CH |
661 | /* unused entries are -1 */ |
662 | } xfs_dir2_free_t; | |
663 | ||
cbc8adf8 DC |
664 | struct xfs_dir3_free_hdr { |
665 | struct xfs_dir3_blk_hdr hdr; | |
666 | __be32 firstdb; /* db of first entry */ | |
667 | __be32 nvalid; /* count of valid entries */ | |
668 | __be32 nused; /* count of used entries */ | |
669 | }; | |
670 | ||
671 | struct xfs_dir3_free { | |
672 | struct xfs_dir3_free_hdr hdr; | |
673 | __be16 bests[]; /* best free counts */ | |
674 | /* unused entries are -1 */ | |
675 | }; | |
676 | ||
677 | #define XFS_DIR3_FREE_CRC_OFF offsetof(struct xfs_dir3_free, hdr.hdr.crc) | |
678 | ||
679 | /* | |
680 | * In core version of the free block header, abstracted away from on-disk format | |
681 | * differences. Use this in the code, and convert to/from the disk version using | |
682 | * xfs_dir3_free_hdr_from_disk/xfs_dir3_free_hdr_to_disk. | |
683 | */ | |
684 | struct xfs_dir3_icfree_hdr { | |
685 | __uint32_t magic; | |
686 | __uint32_t firstdb; | |
687 | __uint32_t nvalid; | |
688 | __uint32_t nused; | |
689 | ||
690 | }; | |
691 | ||
692 | void xfs_dir3_free_hdr_from_disk(struct xfs_dir3_icfree_hdr *to, | |
693 | struct xfs_dir2_free *from); | |
694 | ||
695 | static inline int | |
696 | xfs_dir3_free_hdr_size(struct xfs_mount *mp) | |
a00b7745 | 697 | { |
cbc8adf8 DC |
698 | if (xfs_sb_version_hascrc(&mp->m_sb)) |
699 | return sizeof(struct xfs_dir3_free_hdr); | |
700 | return sizeof(struct xfs_dir2_free_hdr); | |
701 | } | |
702 | ||
703 | static inline int | |
704 | xfs_dir3_free_max_bests(struct xfs_mount *mp) | |
705 | { | |
706 | return (mp->m_dirblksize - xfs_dir3_free_hdr_size(mp)) / | |
a00b7745 CH |
707 | sizeof(xfs_dir2_data_off_t); |
708 | } | |
57926640 | 709 | |
cbc8adf8 DC |
710 | static inline __be16 * |
711 | xfs_dir3_free_bests_p(struct xfs_mount *mp, struct xfs_dir2_free *free) | |
712 | { | |
713 | return (__be16 *)((char *)free + xfs_dir3_free_hdr_size(mp)); | |
714 | } | |
715 | ||
57926640 CH |
716 | /* |
717 | * Convert data space db to the corresponding free db. | |
718 | */ | |
719 | static inline xfs_dir2_db_t | |
720 | xfs_dir2_db_to_fdb(struct xfs_mount *mp, xfs_dir2_db_t db) | |
721 | { | |
cbc8adf8 | 722 | return XFS_DIR2_FREE_FIRSTDB(mp) + db / xfs_dir3_free_max_bests(mp); |
57926640 CH |
723 | } |
724 | ||
725 | /* | |
726 | * Convert data space db to the corresponding index in a free db. | |
727 | */ | |
728 | static inline int | |
729 | xfs_dir2_db_to_fdindex(struct xfs_mount *mp, xfs_dir2_db_t db) | |
730 | { | |
cbc8adf8 | 731 | return db % xfs_dir3_free_max_bests(mp); |
57926640 CH |
732 | } |
733 | ||
734 | /* | |
735 | * Single block format. | |
736 | * | |
737 | * The single block format looks like the following drawing on disk: | |
738 | * | |
739 | * +-------------------------------------------------+ | |
740 | * | xfs_dir2_data_hdr_t | | |
741 | * +-------------------------------------------------+ | |
742 | * | xfs_dir2_data_entry_t OR xfs_dir2_data_unused_t | | |
743 | * | xfs_dir2_data_entry_t OR xfs_dir2_data_unused_t | | |
744 | * | xfs_dir2_data_entry_t OR xfs_dir2_data_unused_t : | |
745 | * | ... | | |
746 | * +-------------------------------------------------+ | |
747 | * | unused space | | |
748 | * +-------------------------------------------------+ | |
749 | * | ... | | |
750 | * | xfs_dir2_leaf_entry_t | | |
751 | * | xfs_dir2_leaf_entry_t | | |
752 | * +-------------------------------------------------+ | |
753 | * | xfs_dir2_block_tail_t | | |
754 | * +-------------------------------------------------+ | |
755 | * | |
756 | * As all the entries are variable size structures the accessors below should | |
757 | * be used to iterate over them. | |
758 | */ | |
759 | ||
760 | typedef struct xfs_dir2_block_tail { | |
761 | __be32 count; /* count of leaf entries */ | |
762 | __be32 stale; /* count of stale lf entries */ | |
763 | } xfs_dir2_block_tail_t; | |
764 | ||
765 | /* | |
766 | * Pointer to the leaf header embedded in a data block (1-block format) | |
767 | */ | |
768 | static inline struct xfs_dir2_block_tail * | |
769 | xfs_dir2_block_tail_p(struct xfs_mount *mp, struct xfs_dir2_data_hdr *hdr) | |
770 | { | |
771 | return ((struct xfs_dir2_block_tail *) | |
772 | ((char *)hdr + mp->m_dirblksize)) - 1; | |
773 | } | |
774 | ||
775 | /* | |
776 | * Pointer to the leaf entries embedded in a data block (1-block format) | |
777 | */ | |
778 | static inline struct xfs_dir2_leaf_entry * | |
779 | xfs_dir2_block_leaf_p(struct xfs_dir2_block_tail *btp) | |
780 | { | |
781 | return ((struct xfs_dir2_leaf_entry *)btp) - be32_to_cpu(btp->count); | |
782 | } | |
783 | ||
784 | #endif /* __XFS_DIR2_FORMAT_H__ */ |