1 /*
2 * Copyright (c) 2000-2001,2005 Silicon Graphics, Inc.
3 * All Rights Reserved.
4 *
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License as
7 * published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it would be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write the Free Software Foundation,
16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
17 */
18 #ifndef __XFS_BTREE_H__
19 #define __XFS_BTREE_H__
20
21 struct xfs_buf;
22 struct xfs_defer_ops;
23 struct xfs_inode;
24 struct xfs_mount;
25 struct xfs_trans;
26
27 extern kmem_zone_t *xfs_btree_cur_zone;
28
29 /*
30 * Generic key, ptr and record wrapper structures.
31 *
32 * These are disk format structures, and are converted where necessary
33 * by the btree specific code that needs to interpret them.
34 */
35 union xfs_btree_ptr {
36 __be32 s; /* short form ptr */
37 __be64 l; /* long form ptr */
38 };
39
40 /*
41 * The in-core btree key. Overlapping btrees actually store two keys
42 * per pointer, so we reserve enough memory to hold both. The __*bigkey
43 * items should never be accessed directly.
44 */
45 union xfs_btree_key {
46 struct xfs_bmbt_key bmbt;
47 xfs_bmdr_key_t bmbr; /* bmbt root block */
48 xfs_alloc_key_t alloc;
49 struct xfs_inobt_key inobt;
50 struct xfs_rmap_key rmap;
51 struct xfs_rmap_key __rmap_bigkey[2];
52 struct xfs_refcount_key refc;
53 };
54
55 union xfs_btree_rec {
56 struct xfs_bmbt_rec bmbt;
57 xfs_bmdr_rec_t bmbr; /* bmbt root block */
58 struct xfs_alloc_rec alloc;
59 struct xfs_inobt_rec inobt;
60 struct xfs_rmap_rec rmap;
61 struct xfs_refcount_rec refc;
62 };
63
64 /*
65 * This nonsense is to make -wlint happy.
66 */
67 #define XFS_LOOKUP_EQ ((xfs_lookup_t)XFS_LOOKUP_EQi)
68 #define XFS_LOOKUP_LE ((xfs_lookup_t)XFS_LOOKUP_LEi)
69 #define XFS_LOOKUP_GE ((xfs_lookup_t)XFS_LOOKUP_GEi)
70
71 #define XFS_BTNUM_BNO ((xfs_btnum_t)XFS_BTNUM_BNOi)
72 #define XFS_BTNUM_CNT ((xfs_btnum_t)XFS_BTNUM_CNTi)
73 #define XFS_BTNUM_BMAP ((xfs_btnum_t)XFS_BTNUM_BMAPi)
74 #define XFS_BTNUM_INO ((xfs_btnum_t)XFS_BTNUM_INOi)
75 #define XFS_BTNUM_FINO ((xfs_btnum_t)XFS_BTNUM_FINOi)
76 #define XFS_BTNUM_RMAP ((xfs_btnum_t)XFS_BTNUM_RMAPi)
77 #define XFS_BTNUM_REFC ((xfs_btnum_t)XFS_BTNUM_REFCi)
78
79 /*
80 * For logging record fields.
81 */
82 #define XFS_BB_MAGIC (1 << 0)
83 #define XFS_BB_LEVEL (1 << 1)
84 #define XFS_BB_NUMRECS (1 << 2)
85 #define XFS_BB_LEFTSIB (1 << 3)
86 #define XFS_BB_RIGHTSIB (1 << 4)
87 #define XFS_BB_BLKNO (1 << 5)
88 #define XFS_BB_LSN (1 << 6)
89 #define XFS_BB_UUID (1 << 7)
90 #define XFS_BB_OWNER (1 << 8)
91 #define XFS_BB_NUM_BITS 5
92 #define XFS_BB_ALL_BITS ((1 << XFS_BB_NUM_BITS) - 1)
93 #define XFS_BB_NUM_BITS_CRC 9
94 #define XFS_BB_ALL_BITS_CRC ((1 << XFS_BB_NUM_BITS_CRC) - 1)
95
96 /*
97 * Generic stats interface
98 */
99 #define __XFS_BTREE_STATS_INC(mp, type, stat) \
100 XFS_STATS_INC(mp, xs_ ## type ## _2_ ## stat)
101 #define XFS_BTREE_STATS_INC(cur, stat) \
102 do { \
103 struct xfs_mount *__mp = cur->bc_mp; \
104 switch (cur->bc_btnum) { \
105 case XFS_BTNUM_BNO: __XFS_BTREE_STATS_INC(__mp, abtb, stat); break; \
106 case XFS_BTNUM_CNT: __XFS_BTREE_STATS_INC(__mp, abtc, stat); break; \
107 case XFS_BTNUM_BMAP: __XFS_BTREE_STATS_INC(__mp, bmbt, stat); break; \
108 case XFS_BTNUM_INO: __XFS_BTREE_STATS_INC(__mp, ibt, stat); break; \
109 case XFS_BTNUM_FINO: __XFS_BTREE_STATS_INC(__mp, fibt, stat); break; \
110 case XFS_BTNUM_RMAP: __XFS_BTREE_STATS_INC(__mp, rmap, stat); break; \
111 case XFS_BTNUM_REFC: __XFS_BTREE_STATS_INC(__mp, refcbt, stat); break; \
112 case XFS_BTNUM_MAX: ASSERT(0); /* fucking gcc */ ; break; \
113 } \
114 } while (0)
115
116 #define __XFS_BTREE_STATS_ADD(mp, type, stat, val) \
117 XFS_STATS_ADD(mp, xs_ ## type ## _2_ ## stat, val)
118 #define XFS_BTREE_STATS_ADD(cur, stat, val) \
119 do { \
120 struct xfs_mount *__mp = cur->bc_mp; \
121 switch (cur->bc_btnum) { \
122 case XFS_BTNUM_BNO: \
123 __XFS_BTREE_STATS_ADD(__mp, abtb, stat, val); break; \
124 case XFS_BTNUM_CNT: \
125 __XFS_BTREE_STATS_ADD(__mp, abtc, stat, val); break; \
126 case XFS_BTNUM_BMAP: \
127 __XFS_BTREE_STATS_ADD(__mp, bmbt, stat, val); break; \
128 case XFS_BTNUM_INO: \
129 __XFS_BTREE_STATS_ADD(__mp, ibt, stat, val); break; \
130 case XFS_BTNUM_FINO: \
131 __XFS_BTREE_STATS_ADD(__mp, fibt, stat, val); break; \
132 case XFS_BTNUM_RMAP: \
133 __XFS_BTREE_STATS_ADD(__mp, rmap, stat, val); break; \
134 case XFS_BTNUM_REFC: \
135 __XFS_BTREE_STATS_ADD(__mp, refcbt, stat, val); break; \
136 case XFS_BTNUM_MAX: ASSERT(0); /* fucking gcc */ ; break; \
137 } \
138 } while (0)
139
140 #define XFS_BTREE_MAXLEVELS 9 /* max of all btrees */
141
142 struct xfs_btree_ops {
143 /* size of the key and record structures */
144 size_t key_len;
145 size_t rec_len;
146
147 /* cursor operations */
148 struct xfs_btree_cur *(*dup_cursor)(struct xfs_btree_cur *);
149 void (*update_cursor)(struct xfs_btree_cur *src,
150 struct xfs_btree_cur *dst);
151
152 /* update btree root pointer */
153 void (*set_root)(struct xfs_btree_cur *cur,
154 union xfs_btree_ptr *nptr, int level_change);
155
156 /* block allocation / freeing */
157 int (*alloc_block)(struct xfs_btree_cur *cur,
158 union xfs_btree_ptr *start_bno,
159 union xfs_btree_ptr *new_bno,
160 int *stat);
161 int (*free_block)(struct xfs_btree_cur *cur, struct xfs_buf *bp);
162
163 /* update last record information */
164 void (*update_lastrec)(struct xfs_btree_cur *cur,
165 struct xfs_btree_block *block,
166 union xfs_btree_rec *rec,
167 int ptr, int reason);
168
169 /* records in block/level */
170 int (*get_minrecs)(struct xfs_btree_cur *cur, int level);
171 int (*get_maxrecs)(struct xfs_btree_cur *cur, int level);
172
173 /* records on disk. Matter for the root in inode case. */
174 int (*get_dmaxrecs)(struct xfs_btree_cur *cur, int level);
175
176 /* init values of btree structures */
177 void (*init_key_from_rec)(union xfs_btree_key *key,
178 union xfs_btree_rec *rec);
179 void (*init_rec_from_cur)(struct xfs_btree_cur *cur,
180 union xfs_btree_rec *rec);
181 void (*init_ptr_from_cur)(struct xfs_btree_cur *cur,
182 union xfs_btree_ptr *ptr);
183 void (*init_high_key_from_rec)(union xfs_btree_key *key,
184 union xfs_btree_rec *rec);
185
186 /* difference between key value and cursor value */
187 __int64_t (*key_diff)(struct xfs_btree_cur *cur,
188 union xfs_btree_key *key);
189
190 /*
191 * Difference between key2 and key1 -- positive if key1 > key2,
192 * negative if key1 < key2, and zero if equal.
193 */
194 __int64_t (*diff_two_keys)(struct xfs_btree_cur *cur,
195 union xfs_btree_key *key1,
196 union xfs_btree_key *key2);
197
198 const struct xfs_buf_ops *buf_ops;
199
200 #if defined(DEBUG) || defined(XFS_WARN)
201 /* check that k1 is lower than k2 */
202 int (*keys_inorder)(struct xfs_btree_cur *cur,
203 union xfs_btree_key *k1,
204 union xfs_btree_key *k2);
205
206 /* check that r1 is lower than r2 */
207 int (*recs_inorder)(struct xfs_btree_cur *cur,
208 union xfs_btree_rec *r1,
209 union xfs_btree_rec *r2);
210 #endif
211 };
212
213 /*
214 * Reasons for the update_lastrec method to be called.
215 */
216 #define LASTREC_UPDATE 0
217 #define LASTREC_INSREC 1
218 #define LASTREC_DELREC 2
219
220
221 union xfs_btree_irec {
222 struct xfs_alloc_rec_incore a;
223 struct xfs_bmbt_irec b;
224 struct xfs_inobt_rec_incore i;
225 struct xfs_rmap_irec r;
226 struct xfs_refcount_irec rc;
227 };
228
229 /* Per-AG btree private information. */
230 union xfs_btree_cur_private {
231 struct {
232 unsigned long nr_ops; /* # record updates */
233 int shape_changes; /* # of extent splits */
234 } refc;
235 };
236
237 /*
238 * Btree cursor structure.
239 * This collects all information needed by the btree code in one place.
240 */
241 typedef struct xfs_btree_cur
242 {
243 struct xfs_trans *bc_tp; /* transaction we're in, if any */
244 struct xfs_mount *bc_mp; /* file system mount struct */
245 const struct xfs_btree_ops *bc_ops;
246 uint bc_flags; /* btree features - below */
247 union xfs_btree_irec bc_rec; /* current insert/search record value */
248 struct xfs_buf *bc_bufs[XFS_BTREE_MAXLEVELS]; /* buf ptr per level */
249 int bc_ptrs[XFS_BTREE_MAXLEVELS]; /* key/record # */
250 __uint8_t bc_ra[XFS_BTREE_MAXLEVELS]; /* readahead bits */
251 #define XFS_BTCUR_LEFTRA 1 /* left sibling has been read-ahead */
252 #define XFS_BTCUR_RIGHTRA 2 /* right sibling has been read-ahead */
253 __uint8_t bc_nlevels; /* number of levels in the tree */
254 __uint8_t bc_blocklog; /* log2(blocksize) of btree blocks */
255 xfs_btnum_t bc_btnum; /* identifies which btree type */
256 union {
257 struct { /* needed for BNO, CNT, INO */
258 struct xfs_buf *agbp; /* agf/agi buffer pointer */
259 struct xfs_defer_ops *dfops; /* deferred updates */
260 xfs_agnumber_t agno; /* ag number */
261 union xfs_btree_cur_private priv;
262 } a;
263 struct { /* needed for BMAP */
264 struct xfs_inode *ip; /* pointer to our inode */
265 struct xfs_defer_ops *dfops; /* deferred updates */
266 xfs_fsblock_t firstblock; /* 1st blk allocated */
267 int allocated; /* count of alloced */
268 short forksize; /* fork's inode space */
269 char whichfork; /* data or attr fork */
270 char flags; /* flags */
271 #define XFS_BTCUR_BPRV_WASDEL (1<<0) /* was delayed */
272 #define XFS_BTCUR_BPRV_INVALID_OWNER (1<<1) /* for ext swap */
273 } b;
274 } bc_private; /* per-btree type data */
275 } xfs_btree_cur_t;
276
277 /* cursor flags */
278 #define XFS_BTREE_LONG_PTRS (1<<0) /* pointers are 64bits long */
279 #define XFS_BTREE_ROOT_IN_INODE (1<<1) /* root may be variable size */
280 #define XFS_BTREE_LASTREC_UPDATE (1<<2) /* track last rec externally */
281 #define XFS_BTREE_CRC_BLOCKS (1<<3) /* uses extended btree blocks */
282 #define XFS_BTREE_OVERLAPPING (1<<4) /* overlapping intervals */
283
284
285 #define XFS_BTREE_NOERROR 0
286 #define XFS_BTREE_ERROR 1
287
288 /*
289 * Convert from buffer to btree block header.
290 */
291 #define XFS_BUF_TO_BLOCK(bp) ((struct xfs_btree_block *)((bp)->b_addr))
292
293
294 /*
295 * Check that block header is ok.
296 */
297 int
298 xfs_btree_check_block(
299 struct xfs_btree_cur *cur, /* btree cursor */
300 struct xfs_btree_block *block, /* generic btree block pointer */
301 int level, /* level of the btree block */
302 struct xfs_buf *bp); /* buffer containing block, if any */
303
304 /*
305 * Check that (long) pointer is ok.
306 */
307 int /* error (0 or EFSCORRUPTED) */
308 xfs_btree_check_lptr(
309 struct xfs_btree_cur *cur, /* btree cursor */
310 xfs_fsblock_t ptr, /* btree block disk address */
311 int level); /* btree block level */
312
313 /*
314 * Delete the btree cursor.
315 */
316 void
317 xfs_btree_del_cursor(
318 xfs_btree_cur_t *cur, /* btree cursor */
319 int error); /* del because of error */
320
321 /*
322 * Duplicate the btree cursor.
323 * Allocate a new one, copy the record, re-get the buffers.
324 */
325 int /* error */
326 xfs_btree_dup_cursor(
327 xfs_btree_cur_t *cur, /* input cursor */
328 xfs_btree_cur_t **ncur);/* output cursor */
329
330 /*
331 * Get a buffer for the block, return it with no data read.
332 * Long-form addressing.
333 */
334 struct xfs_buf * /* buffer for fsbno */
335 xfs_btree_get_bufl(
336 struct xfs_mount *mp, /* file system mount point */
337 struct xfs_trans *tp, /* transaction pointer */
338 xfs_fsblock_t fsbno, /* file system block number */
339 uint lock); /* lock flags for get_buf */
340
341 /*
342 * Get a buffer for the block, return it with no data read.
343 * Short-form addressing.
344 */
345 struct xfs_buf * /* buffer for agno/agbno */
346 xfs_btree_get_bufs(
347 struct xfs_mount *mp, /* file system mount point */
348 struct xfs_trans *tp, /* transaction pointer */
349 xfs_agnumber_t agno, /* allocation group number */
350 xfs_agblock_t agbno, /* allocation group block number */
351 uint lock); /* lock flags for get_buf */
352
353 /*
354 * Check for the cursor referring to the last block at the given level.
355 */
356 int /* 1=is last block, 0=not last block */
357 xfs_btree_islastblock(
358 xfs_btree_cur_t *cur, /* btree cursor */
359 int level); /* level to check */
360
361 /*
362 * Compute first and last byte offsets for the fields given.
363 * Interprets the offsets table, which contains struct field offsets.
364 */
365 void
366 xfs_btree_offsets(
367 __int64_t fields, /* bitmask of fields */
368 const short *offsets,/* table of field offsets */
369 int nbits, /* number of bits to inspect */
370 int *first, /* output: first byte offset */
371 int *last); /* output: last byte offset */
372
373 /*
374 * Get a buffer for the block, return it read in.
375 * Long-form addressing.
376 */
377 int /* error */
378 xfs_btree_read_bufl(
379 struct xfs_mount *mp, /* file system mount point */
380 struct xfs_trans *tp, /* transaction pointer */
381 xfs_fsblock_t fsbno, /* file system block number */
382 uint lock, /* lock flags for read_buf */
383 struct xfs_buf **bpp, /* buffer for fsbno */
384 int refval, /* ref count value for buffer */
385 const struct xfs_buf_ops *ops);
386
387 /*
388 * Read-ahead the block, don't wait for it, don't return a buffer.
389 * Long-form addressing.
390 */
391 void /* error */
392 xfs_btree_reada_bufl(
393 struct xfs_mount *mp, /* file system mount point */
394 xfs_fsblock_t fsbno, /* file system block number */
395 xfs_extlen_t count, /* count of filesystem blocks */
396 const struct xfs_buf_ops *ops);
397
398 /*
399 * Read-ahead the block, don't wait for it, don't return a buffer.
400 * Short-form addressing.
401 */
402 void /* error */
403 xfs_btree_reada_bufs(
404 struct xfs_mount *mp, /* file system mount point */
405 xfs_agnumber_t agno, /* allocation group number */
406 xfs_agblock_t agbno, /* allocation group block number */
407 xfs_extlen_t count, /* count of filesystem blocks */
408 const struct xfs_buf_ops *ops);
409
410 /*
411 * Initialise a new btree block header
412 */
413 void
414 xfs_btree_init_block(
415 struct xfs_mount *mp,
416 struct xfs_buf *bp,
417 __u32 magic,
418 __u16 level,
419 __u16 numrecs,
420 __u64 owner,
421 unsigned int flags);
422
423 void
424 xfs_btree_init_block_int(
425 struct xfs_mount *mp,
426 struct xfs_btree_block *buf,
427 xfs_daddr_t blkno,
428 __u32 magic,
429 __u16 level,
430 __u16 numrecs,
431 __u64 owner,
432 unsigned int flags);
433
434 /*
435 * Common btree core entry points.
436 */
437 int xfs_btree_increment(struct xfs_btree_cur *, int, int *);
438 int xfs_btree_decrement(struct xfs_btree_cur *, int, int *);
439 int xfs_btree_lookup(struct xfs_btree_cur *, xfs_lookup_t, int *);
440 int xfs_btree_update(struct xfs_btree_cur *, union xfs_btree_rec *);
441 int xfs_btree_new_iroot(struct xfs_btree_cur *, int *, int *);
442 int xfs_btree_insert(struct xfs_btree_cur *, int *);
443 int xfs_btree_delete(struct xfs_btree_cur *, int *);
444 int xfs_btree_get_rec(struct xfs_btree_cur *, union xfs_btree_rec **, int *);
445 int xfs_btree_change_owner(struct xfs_btree_cur *cur, __uint64_t new_owner,
446 struct list_head *buffer_list);
447
448 /*
449 * btree block CRC helpers
450 */
451 void xfs_btree_lblock_calc_crc(struct xfs_buf *);
452 bool xfs_btree_lblock_verify_crc(struct xfs_buf *);
453 void xfs_btree_sblock_calc_crc(struct xfs_buf *);
454 bool xfs_btree_sblock_verify_crc(struct xfs_buf *);
455
456 /*
457 * Internal btree helpers also used by xfs_bmap.c.
458 */
459 void xfs_btree_log_block(struct xfs_btree_cur *, struct xfs_buf *, int);
460 void xfs_btree_log_recs(struct xfs_btree_cur *, struct xfs_buf *, int, int);
461
462 /*
463 * Helpers.
464 */
xfs_btree_get_numrecs(struct xfs_btree_block * block)465 static inline int xfs_btree_get_numrecs(struct xfs_btree_block *block)
466 {
467 return be16_to_cpu(block->bb_numrecs);
468 }
469
xfs_btree_set_numrecs(struct xfs_btree_block * block,__uint16_t numrecs)470 static inline void xfs_btree_set_numrecs(struct xfs_btree_block *block,
471 __uint16_t numrecs)
472 {
473 block->bb_numrecs = cpu_to_be16(numrecs);
474 }
475
xfs_btree_get_level(struct xfs_btree_block * block)476 static inline int xfs_btree_get_level(struct xfs_btree_block *block)
477 {
478 return be16_to_cpu(block->bb_level);
479 }
480
481
482 /*
483 * Min and max functions for extlen, agblock, fileoff, and filblks types.
484 */
485 #define XFS_EXTLEN_MIN(a,b) min_t(xfs_extlen_t, (a), (b))
486 #define XFS_EXTLEN_MAX(a,b) max_t(xfs_extlen_t, (a), (b))
487 #define XFS_AGBLOCK_MIN(a,b) min_t(xfs_agblock_t, (a), (b))
488 #define XFS_AGBLOCK_MAX(a,b) max_t(xfs_agblock_t, (a), (b))
489 #define XFS_FILEOFF_MIN(a,b) min_t(xfs_fileoff_t, (a), (b))
490 #define XFS_FILEOFF_MAX(a,b) max_t(xfs_fileoff_t, (a), (b))
491 #define XFS_FILBLKS_MIN(a,b) min_t(xfs_filblks_t, (a), (b))
492 #define XFS_FILBLKS_MAX(a,b) max_t(xfs_filblks_t, (a), (b))
493
494 #define XFS_FSB_SANITY_CHECK(mp,fsb) \
495 (fsb && XFS_FSB_TO_AGNO(mp, fsb) < mp->m_sb.sb_agcount && \
496 XFS_FSB_TO_AGBNO(mp, fsb) < mp->m_sb.sb_agblocks)
497
498 /*
499 * Trace hooks. Currently not implemented as they need to be ported
500 * over to the generic tracing functionality, which is some effort.
501 *
502 * i,j = integer (32 bit)
503 * b = btree block buffer (xfs_buf_t)
504 * p = btree ptr
505 * r = btree record
506 * k = btree key
507 */
508 #define XFS_BTREE_TRACE_ARGBI(c, b, i)
509 #define XFS_BTREE_TRACE_ARGBII(c, b, i, j)
510 #define XFS_BTREE_TRACE_ARGI(c, i)
511 #define XFS_BTREE_TRACE_ARGIPK(c, i, p, s)
512 #define XFS_BTREE_TRACE_ARGIPR(c, i, p, r)
513 #define XFS_BTREE_TRACE_ARGIK(c, i, k)
514 #define XFS_BTREE_TRACE_ARGR(c, r)
515 #define XFS_BTREE_TRACE_CURSOR(c, t)
516
517 bool xfs_btree_sblock_v5hdr_verify(struct xfs_buf *bp);
518 bool xfs_btree_sblock_verify(struct xfs_buf *bp, unsigned int max_recs);
519 uint xfs_btree_compute_maxlevels(struct xfs_mount *mp, uint *limits,
520 unsigned long len);
521 xfs_extlen_t xfs_btree_calc_size(struct xfs_mount *mp, uint *limits,
522 unsigned long long len);
523
524 /* return codes */
525 #define XFS_BTREE_QUERY_RANGE_CONTINUE 0 /* keep iterating */
526 #define XFS_BTREE_QUERY_RANGE_ABORT 1 /* stop iterating */
527 typedef int (*xfs_btree_query_range_fn)(struct xfs_btree_cur *cur,
528 union xfs_btree_rec *rec, void *priv);
529
530 int xfs_btree_query_range(struct xfs_btree_cur *cur,
531 union xfs_btree_irec *low_rec, union xfs_btree_irec *high_rec,
532 xfs_btree_query_range_fn fn, void *priv);
533
534 typedef int (*xfs_btree_visit_blocks_fn)(struct xfs_btree_cur *cur, int level,
535 void *data);
536 int xfs_btree_visit_blocks(struct xfs_btree_cur *cur,
537 xfs_btree_visit_blocks_fn fn, void *data);
538
539 int xfs_btree_count_blocks(struct xfs_btree_cur *cur, xfs_extlen_t *blocks);
540
541 #endif /* __XFS_BTREE_H__ */
542