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18#ifndef __XFS_BTREE_H__
19#define __XFS_BTREE_H__
20
21struct xfs_buf;
22struct xfs_bmap_free;
23struct xfs_inode;
24struct xfs_mount;
25struct xfs_trans;
26
27extern kmem_zone_t *xfs_btree_cur_zone;
28
29
30
31
32#define XFS_LOOKUP_EQ ((xfs_lookup_t)XFS_LOOKUP_EQi)
33#define XFS_LOOKUP_LE ((xfs_lookup_t)XFS_LOOKUP_LEi)
34#define XFS_LOOKUP_GE ((xfs_lookup_t)XFS_LOOKUP_GEi)
35
36#define XFS_BTNUM_BNO ((xfs_btnum_t)XFS_BTNUM_BNOi)
37#define XFS_BTNUM_CNT ((xfs_btnum_t)XFS_BTNUM_CNTi)
38#define XFS_BTNUM_BMAP ((xfs_btnum_t)XFS_BTNUM_BMAPi)
39#define XFS_BTNUM_INO ((xfs_btnum_t)XFS_BTNUM_INOi)
40
41
42
43
44
45
46
47
48
49
50
51struct xfs_btree_block {
52 __be32 bb_magic;
53 __be16 bb_level;
54 __be16 bb_numrecs;
55 union {
56 struct {
57 __be32 bb_leftsib;
58 __be32 bb_rightsib;
59 } s;
60 struct {
61 __be64 bb_leftsib;
62 __be64 bb_rightsib;
63 } l;
64 } bb_u;
65};
66
67#define XFS_BTREE_SBLOCK_LEN 16
68#define XFS_BTREE_LBLOCK_LEN 24
69
70
71
72
73
74
75
76
77union xfs_btree_ptr {
78 __be32 s;
79 __be64 l;
80};
81
82union xfs_btree_key {
83 xfs_bmbt_key_t bmbt;
84 xfs_bmdr_key_t bmbr;
85 xfs_alloc_key_t alloc;
86 xfs_inobt_key_t inobt;
87};
88
89union xfs_btree_rec {
90 xfs_bmbt_rec_t bmbt;
91 xfs_bmdr_rec_t bmbr;
92 xfs_alloc_rec_t alloc;
93 xfs_inobt_rec_t inobt;
94};
95
96
97
98
99#define XFS_BB_MAGIC 0x01
100#define XFS_BB_LEVEL 0x02
101#define XFS_BB_NUMRECS 0x04
102#define XFS_BB_LEFTSIB 0x08
103#define XFS_BB_RIGHTSIB 0x10
104#define XFS_BB_NUM_BITS 5
105#define XFS_BB_ALL_BITS ((1 << XFS_BB_NUM_BITS) - 1)
106
107
108
109
110extern const __uint32_t xfs_magics[];
111
112
113
114
115#define __XFS_BTREE_STATS_INC(type, stat) \
116 XFS_STATS_INC(xs_ ## type ## _2_ ## stat)
117#define XFS_BTREE_STATS_INC(cur, stat) \
118do { \
119 switch (cur->bc_btnum) { \
120 case XFS_BTNUM_BNO: __XFS_BTREE_STATS_INC(abtb, stat); break; \
121 case XFS_BTNUM_CNT: __XFS_BTREE_STATS_INC(abtc, stat); break; \
122 case XFS_BTNUM_BMAP: __XFS_BTREE_STATS_INC(bmbt, stat); break; \
123 case XFS_BTNUM_INO: __XFS_BTREE_STATS_INC(ibt, stat); break; \
124 case XFS_BTNUM_MAX: ASSERT(0); ; break; \
125 } \
126} while (0)
127
128#define __XFS_BTREE_STATS_ADD(type, stat, val) \
129 XFS_STATS_ADD(xs_ ## type ## _2_ ## stat, val)
130#define XFS_BTREE_STATS_ADD(cur, stat, val) \
131do { \
132 switch (cur->bc_btnum) { \
133 case XFS_BTNUM_BNO: __XFS_BTREE_STATS_ADD(abtb, stat, val); break; \
134 case XFS_BTNUM_CNT: __XFS_BTREE_STATS_ADD(abtc, stat, val); break; \
135 case XFS_BTNUM_BMAP: __XFS_BTREE_STATS_ADD(bmbt, stat, val); break; \
136 case XFS_BTNUM_INO: __XFS_BTREE_STATS_ADD(ibt, stat, val); break; \
137 case XFS_BTNUM_MAX: ASSERT(0); ; break; \
138 } \
139} while (0)
140
141#define XFS_BTREE_MAXLEVELS 8
142
143struct xfs_btree_ops {
144
145 size_t key_len;
146 size_t rec_len;
147
148
149 struct xfs_btree_cur *(*dup_cursor)(struct xfs_btree_cur *);
150 void (*update_cursor)(struct xfs_btree_cur *src,
151 struct xfs_btree_cur *dst);
152
153
154 void (*set_root)(struct xfs_btree_cur *cur,
155 union xfs_btree_ptr *nptr, int level_change);
156 int (*kill_root)(struct xfs_btree_cur *cur, struct xfs_buf *bp,
157 int level, union xfs_btree_ptr *newroot);
158
159
160 int (*alloc_block)(struct xfs_btree_cur *cur,
161 union xfs_btree_ptr *start_bno,
162 union xfs_btree_ptr *new_bno,
163 int length, int *stat);
164 int (*free_block)(struct xfs_btree_cur *cur, struct xfs_buf *bp);
165
166
167 void (*update_lastrec)(struct xfs_btree_cur *cur,
168 struct xfs_btree_block *block,
169 union xfs_btree_rec *rec,
170 int ptr, int reason);
171
172
173 int (*get_minrecs)(struct xfs_btree_cur *cur, int level);
174 int (*get_maxrecs)(struct xfs_btree_cur *cur, int level);
175
176
177 int (*get_dmaxrecs)(struct xfs_btree_cur *cur, int level);
178
179
180 void (*init_key_from_rec)(union xfs_btree_key *key,
181 union xfs_btree_rec *rec);
182 void (*init_rec_from_key)(union xfs_btree_key *key,
183 union xfs_btree_rec *rec);
184 void (*init_rec_from_cur)(struct xfs_btree_cur *cur,
185 union xfs_btree_rec *rec);
186 void (*init_ptr_from_cur)(struct xfs_btree_cur *cur,
187 union xfs_btree_ptr *ptr);
188
189
190 __int64_t (*key_diff)(struct xfs_btree_cur *cur,
191 union xfs_btree_key *key);
192
193#ifdef DEBUG
194
195 int (*keys_inorder)(struct xfs_btree_cur *cur,
196 union xfs_btree_key *k1,
197 union xfs_btree_key *k2);
198
199
200 int (*recs_inorder)(struct xfs_btree_cur *cur,
201 union xfs_btree_rec *r1,
202 union xfs_btree_rec *r2);
203#endif
204
205
206#ifdef XFS_BTREE_TRACE
207 void (*trace_enter)(struct xfs_btree_cur *, const char *,
208 char *, int, int, __psunsigned_t,
209 __psunsigned_t, __psunsigned_t,
210 __psunsigned_t, __psunsigned_t,
211 __psunsigned_t, __psunsigned_t,
212 __psunsigned_t, __psunsigned_t,
213 __psunsigned_t, __psunsigned_t);
214 void (*trace_cursor)(struct xfs_btree_cur *, __uint32_t *,
215 __uint64_t *, __uint64_t *);
216 void (*trace_key)(struct xfs_btree_cur *,
217 union xfs_btree_key *, __uint64_t *,
218 __uint64_t *);
219 void (*trace_record)(struct xfs_btree_cur *,
220 union xfs_btree_rec *, __uint64_t *,
221 __uint64_t *, __uint64_t *);
222#endif
223};
224
225
226
227
228#define LASTREC_UPDATE 0
229#define LASTREC_INSREC 1
230#define LASTREC_DELREC 2
231
232
233
234
235
236
237typedef struct xfs_btree_cur
238{
239 struct xfs_trans *bc_tp;
240 struct xfs_mount *bc_mp;
241 const struct xfs_btree_ops *bc_ops;
242 uint bc_flags;
243 union {
244 xfs_alloc_rec_incore_t a;
245 xfs_bmbt_irec_t b;
246 xfs_inobt_rec_incore_t i;
247 } bc_rec;
248 struct xfs_buf *bc_bufs[XFS_BTREE_MAXLEVELS];
249 int bc_ptrs[XFS_BTREE_MAXLEVELS];
250 __uint8_t bc_ra[XFS_BTREE_MAXLEVELS];
251#define XFS_BTCUR_LEFTRA 1
252#define XFS_BTCUR_RIGHTRA 2
253 __uint8_t bc_nlevels;
254 __uint8_t bc_blocklog;
255 xfs_btnum_t bc_btnum;
256 union {
257 struct {
258 struct xfs_buf *agbp;
259 xfs_agnumber_t agno;
260 } a;
261 struct {
262 struct xfs_inode *ip;
263 struct xfs_bmap_free *flist;
264 xfs_fsblock_t firstblock;
265 int allocated;
266 short forksize;
267 char whichfork;
268 char flags;
269#define XFS_BTCUR_BPRV_WASDEL 1
270 } b;
271 } bc_private;
272} xfs_btree_cur_t;
273
274
275#define XFS_BTREE_LONG_PTRS (1<<0)
276#define XFS_BTREE_ROOT_IN_INODE (1<<1)
277#define XFS_BTREE_LASTREC_UPDATE (1<<2)
278
279
280#define XFS_BTREE_NOERROR 0
281#define XFS_BTREE_ERROR 1
282
283
284
285
286#define XFS_BUF_TO_BLOCK(bp) ((struct xfs_btree_block *)XFS_BUF_PTR(bp))
287
288
289
290
291
292int
293xfs_btree_check_block(
294 struct xfs_btree_cur *cur,
295 struct xfs_btree_block *block,
296 int level,
297 struct xfs_buf *bp);
298
299
300
301
302int
303xfs_btree_check_lptr(
304 struct xfs_btree_cur *cur,
305 xfs_dfsbno_t ptr,
306 int level);
307
308
309
310
311void
312xfs_btree_del_cursor(
313 xfs_btree_cur_t *cur,
314 int error);
315
316
317
318
319
320int
321xfs_btree_dup_cursor(
322 xfs_btree_cur_t *cur,
323 xfs_btree_cur_t **ncur);
324
325
326
327
328
329struct xfs_buf *
330xfs_btree_get_bufl(
331 struct xfs_mount *mp,
332 struct xfs_trans *tp,
333 xfs_fsblock_t fsbno,
334 uint lock);
335
336
337
338
339
340struct xfs_buf *
341xfs_btree_get_bufs(
342 struct xfs_mount *mp,
343 struct xfs_trans *tp,
344 xfs_agnumber_t agno,
345 xfs_agblock_t agbno,
346 uint lock);
347
348
349
350
351int
352xfs_btree_islastblock(
353 xfs_btree_cur_t *cur,
354 int level);
355
356
357
358
359
360void
361xfs_btree_offsets(
362 __int64_t fields,
363 const short *offsets,
364 int nbits,
365 int *first,
366 int *last);
367
368
369
370
371
372int
373xfs_btree_read_bufl(
374 struct xfs_mount *mp,
375 struct xfs_trans *tp,
376 xfs_fsblock_t fsbno,
377 uint lock,
378 struct xfs_buf **bpp,
379 int refval);
380
381
382
383
384
385void
386xfs_btree_reada_bufl(
387 struct xfs_mount *mp,
388 xfs_fsblock_t fsbno,
389 xfs_extlen_t count);
390
391
392
393
394
395void
396xfs_btree_reada_bufs(
397 struct xfs_mount *mp,
398 xfs_agnumber_t agno,
399 xfs_agblock_t agbno,
400 xfs_extlen_t count);
401
402
403
404
405
406void
407xfs_btree_setbuf(
408 xfs_btree_cur_t *cur,
409 int lev,
410 struct xfs_buf *bp);
411
412
413
414
415
416int xfs_btree_increment(struct xfs_btree_cur *, int, int *);
417int xfs_btree_decrement(struct xfs_btree_cur *, int, int *);
418int xfs_btree_lookup(struct xfs_btree_cur *, xfs_lookup_t, int *);
419int xfs_btree_update(struct xfs_btree_cur *, union xfs_btree_rec *);
420int xfs_btree_new_iroot(struct xfs_btree_cur *, int *, int *);
421int xfs_btree_insert(struct xfs_btree_cur *, int *);
422int xfs_btree_delete(struct xfs_btree_cur *, int *);
423int xfs_btree_get_rec(struct xfs_btree_cur *, union xfs_btree_rec **, int *);
424
425
426
427
428void xfs_btree_log_block(struct xfs_btree_cur *, struct xfs_buf *, int);
429void xfs_btree_log_recs(struct xfs_btree_cur *, struct xfs_buf *, int, int);
430
431
432
433
434static inline int xfs_btree_get_numrecs(struct xfs_btree_block *block)
435{
436 return be16_to_cpu(block->bb_numrecs);
437}
438
439static inline void xfs_btree_set_numrecs(struct xfs_btree_block *block,
440 __uint16_t numrecs)
441{
442 block->bb_numrecs = cpu_to_be16(numrecs);
443}
444
445static inline int xfs_btree_get_level(struct xfs_btree_block *block)
446{
447 return be16_to_cpu(block->bb_level);
448}
449
450
451
452
453
454#define XFS_EXTLEN_MIN(a,b) min_t(xfs_extlen_t, (a), (b))
455#define XFS_EXTLEN_MAX(a,b) max_t(xfs_extlen_t, (a), (b))
456#define XFS_AGBLOCK_MIN(a,b) min_t(xfs_agblock_t, (a), (b))
457#define XFS_AGBLOCK_MAX(a,b) max_t(xfs_agblock_t, (a), (b))
458#define XFS_FILEOFF_MIN(a,b) min_t(xfs_fileoff_t, (a), (b))
459#define XFS_FILEOFF_MAX(a,b) max_t(xfs_fileoff_t, (a), (b))
460#define XFS_FILBLKS_MIN(a,b) min_t(xfs_filblks_t, (a), (b))
461#define XFS_FILBLKS_MAX(a,b) max_t(xfs_filblks_t, (a), (b))
462
463#define XFS_FSB_SANITY_CHECK(mp,fsb) \
464 (XFS_FSB_TO_AGNO(mp, fsb) < mp->m_sb.sb_agcount && \
465 XFS_FSB_TO_AGBNO(mp, fsb) < mp->m_sb.sb_agblocks)
466
467#endif
468