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1da177e4 | 1 | /* |
7b718769 NS |
2 | * Copyright (c) 2000-2001,2005 Silicon Graphics, Inc. |
3 | * All Rights Reserved. | |
1da177e4 | 4 | * |
7b718769 NS |
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 | |
1da177e4 LT |
7 | * published by the Free Software Foundation. |
8 | * | |
7b718769 NS |
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. | |
1da177e4 | 13 | * |
7b718769 NS |
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 | |
1da177e4 LT |
17 | */ |
18 | #ifndef __XFS_BTREE_H__ | |
19 | #define __XFS_BTREE_H__ | |
20 | ||
21 | struct xfs_buf; | |
22 | struct xfs_bmap_free; | |
23 | struct xfs_inode; | |
24 | struct xfs_mount; | |
25 | struct xfs_trans; | |
26 | ||
a8272ce0 DC |
27 | extern kmem_zone_t *xfs_btree_cur_zone; |
28 | ||
1da177e4 LT |
29 | /* |
30 | * This nonsense is to make -wlint happy. | |
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 | * Short form header: space allocation btrees. | |
43 | */ | |
16259e7d CH |
44 | typedef struct xfs_btree_sblock { |
45 | __be32 bb_magic; /* magic number for block type */ | |
46 | __be16 bb_level; /* 0 is a leaf */ | |
47 | __be16 bb_numrecs; /* current # of data records */ | |
48 | __be32 bb_leftsib; /* left sibling block or NULLAGBLOCK */ | |
49 | __be32 bb_rightsib; /* right sibling block or NULLAGBLOCK */ | |
1da177e4 LT |
50 | } xfs_btree_sblock_t; |
51 | ||
52 | /* | |
53 | * Long form header: bmap btrees. | |
54 | */ | |
16259e7d CH |
55 | typedef struct xfs_btree_lblock { |
56 | __be32 bb_magic; /* magic number for block type */ | |
57 | __be16 bb_level; /* 0 is a leaf */ | |
58 | __be16 bb_numrecs; /* current # of data records */ | |
59 | __be64 bb_leftsib; /* left sibling block or NULLDFSBNO */ | |
60 | __be64 bb_rightsib; /* right sibling block or NULLDFSBNO */ | |
1da177e4 LT |
61 | } xfs_btree_lblock_t; |
62 | ||
63 | /* | |
64 | * Combined header and structure, used by common code. | |
65 | */ | |
f2277f06 | 66 | typedef struct xfs_btree_block { |
16259e7d CH |
67 | __be32 bb_magic; /* magic number for block type */ |
68 | __be16 bb_level; /* 0 is a leaf */ | |
69 | __be16 bb_numrecs; /* current # of data records */ | |
16259e7d CH |
70 | union { |
71 | struct { | |
72 | __be32 bb_leftsib; | |
73 | __be32 bb_rightsib; | |
74 | } s; /* short form pointers */ | |
1da177e4 | 75 | struct { |
16259e7d CH |
76 | __be64 bb_leftsib; |
77 | __be64 bb_rightsib; | |
78 | } l; /* long form pointers */ | |
79 | } bb_u; /* rest */ | |
1da177e4 LT |
80 | } xfs_btree_block_t; |
81 | ||
de227dd9 CH |
82 | /* |
83 | * Generic key, ptr and record wrapper structures. | |
84 | * | |
85 | * These are disk format structures, and are converted where necessary | |
86 | * by the btree specific code that needs to interpret them. | |
87 | */ | |
88 | union xfs_btree_ptr { | |
89 | __be32 s; /* short form ptr */ | |
90 | __be64 l; /* long form ptr */ | |
91 | }; | |
92 | ||
93 | union xfs_btree_key { | |
94 | xfs_bmbt_key_t bmbt; | |
95 | xfs_bmdr_key_t bmbr; /* bmbt root block */ | |
96 | xfs_alloc_key_t alloc; | |
97 | xfs_inobt_key_t inobt; | |
98 | }; | |
99 | ||
100 | union xfs_btree_rec { | |
101 | xfs_bmbt_rec_t bmbt; | |
102 | xfs_bmdr_rec_t bmbr; /* bmbt root block */ | |
103 | xfs_alloc_rec_t alloc; | |
104 | xfs_inobt_rec_t inobt; | |
105 | }; | |
106 | ||
1da177e4 LT |
107 | /* |
108 | * For logging record fields. | |
109 | */ | |
110 | #define XFS_BB_MAGIC 0x01 | |
111 | #define XFS_BB_LEVEL 0x02 | |
112 | #define XFS_BB_NUMRECS 0x04 | |
113 | #define XFS_BB_LEFTSIB 0x08 | |
114 | #define XFS_BB_RIGHTSIB 0x10 | |
115 | #define XFS_BB_NUM_BITS 5 | |
116 | #define XFS_BB_ALL_BITS ((1 << XFS_BB_NUM_BITS) - 1) | |
117 | ||
1da177e4 LT |
118 | /* |
119 | * Magic numbers for btree blocks. | |
120 | */ | |
121 | extern const __uint32_t xfs_magics[]; | |
122 | ||
854929f0 DC |
123 | /* |
124 | * Generic stats interface | |
125 | */ | |
126 | #define __XFS_BTREE_STATS_INC(type, stat) \ | |
127 | XFS_STATS_INC(xs_ ## type ## _2_ ## stat) | |
128 | #define XFS_BTREE_STATS_INC(cur, stat) \ | |
129 | do { \ | |
130 | switch (cur->bc_btnum) { \ | |
131 | case XFS_BTNUM_BNO: __XFS_BTREE_STATS_INC(abtb, stat); break; \ | |
132 | case XFS_BTNUM_CNT: __XFS_BTREE_STATS_INC(abtc, stat); break; \ | |
133 | case XFS_BTNUM_BMAP: __XFS_BTREE_STATS_INC(bmbt, stat); break; \ | |
134 | case XFS_BTNUM_INO: __XFS_BTREE_STATS_INC(ibt, stat); break; \ | |
135 | case XFS_BTNUM_MAX: ASSERT(0); /* fucking gcc */ ; break; \ | |
136 | } \ | |
137 | } while (0) | |
138 | ||
139 | #define __XFS_BTREE_STATS_ADD(type, stat, val) \ | |
140 | XFS_STATS_ADD(xs_ ## type ## _2_ ## stat, val) | |
141 | #define XFS_BTREE_STATS_ADD(cur, stat, val) \ | |
142 | do { \ | |
143 | switch (cur->bc_btnum) { \ | |
144 | case XFS_BTNUM_BNO: __XFS_BTREE_STATS_ADD(abtb, stat, val); break; \ | |
145 | case XFS_BTNUM_CNT: __XFS_BTREE_STATS_ADD(abtc, stat, val); break; \ | |
146 | case XFS_BTNUM_BMAP: __XFS_BTREE_STATS_ADD(bmbt, stat, val); break; \ | |
147 | case XFS_BTNUM_INO: __XFS_BTREE_STATS_ADD(ibt, stat, val); break; \ | |
148 | case XFS_BTNUM_MAX: ASSERT(0); /* fucking gcc */ ; break; \ | |
149 | } \ | |
150 | } while (0) | |
1da177e4 LT |
151 | /* |
152 | * Maximum and minimum records in a btree block. | |
153 | * Given block size, type prefix, and leaf flag (0 or 1). | |
154 | * The divisor below is equivalent to lf ? (e1) : (e2) but that produces | |
155 | * compiler warnings. | |
156 | */ | |
157 | #define XFS_BTREE_BLOCK_MAXRECS(bsz,t,lf) \ | |
158 | ((int)(((bsz) - (uint)sizeof(t ## _block_t)) / \ | |
159 | (((lf) * (uint)sizeof(t ## _rec_t)) + \ | |
160 | ((1 - (lf)) * \ | |
161 | ((uint)sizeof(t ## _key_t) + (uint)sizeof(t ## _ptr_t)))))) | |
162 | #define XFS_BTREE_BLOCK_MINRECS(bsz,t,lf) \ | |
163 | (XFS_BTREE_BLOCK_MAXRECS(bsz,t,lf) / 2) | |
164 | ||
165 | /* | |
166 | * Record, key, and pointer address calculation macros. | |
167 | * Given block size, type prefix, block pointer, and index of requested entry | |
168 | * (first entry numbered 1). | |
169 | */ | |
2c36dded | 170 | #define XFS_BTREE_REC_ADDR(t,bb,i) \ |
1da177e4 LT |
171 | ((t ## _rec_t *)((char *)(bb) + sizeof(t ## _block_t) + \ |
172 | ((i) - 1) * sizeof(t ## _rec_t))) | |
2c36dded | 173 | #define XFS_BTREE_KEY_ADDR(t,bb,i) \ |
1da177e4 LT |
174 | ((t ## _key_t *)((char *)(bb) + sizeof(t ## _block_t) + \ |
175 | ((i) - 1) * sizeof(t ## _key_t))) | |
2c36dded | 176 | #define XFS_BTREE_PTR_ADDR(t,bb,i,mxr) \ |
1da177e4 LT |
177 | ((t ## _ptr_t *)((char *)(bb) + sizeof(t ## _block_t) + \ |
178 | (mxr) * sizeof(t ## _key_t) + ((i) - 1) * sizeof(t ## _ptr_t))) | |
179 | ||
180 | #define XFS_BTREE_MAXLEVELS 8 /* max of all btrees */ | |
181 | ||
561f7d17 CH |
182 | struct xfs_btree_ops { |
183 | /* cursor operations */ | |
184 | struct xfs_btree_cur *(*dup_cursor)(struct xfs_btree_cur *); | |
185 | }; | |
186 | ||
1da177e4 LT |
187 | /* |
188 | * Btree cursor structure. | |
189 | * This collects all information needed by the btree code in one place. | |
190 | */ | |
191 | typedef struct xfs_btree_cur | |
192 | { | |
193 | struct xfs_trans *bc_tp; /* transaction we're in, if any */ | |
194 | struct xfs_mount *bc_mp; /* file system mount struct */ | |
561f7d17 | 195 | const struct xfs_btree_ops *bc_ops; |
8186e517 | 196 | uint bc_flags; /* btree features - below */ |
1da177e4 | 197 | union { |
16259e7d | 198 | xfs_alloc_rec_incore_t a; |
1da177e4 | 199 | xfs_bmbt_irec_t b; |
61a25848 | 200 | xfs_inobt_rec_incore_t i; |
1da177e4 LT |
201 | } bc_rec; /* current insert/search record value */ |
202 | struct xfs_buf *bc_bufs[XFS_BTREE_MAXLEVELS]; /* buf ptr per level */ | |
203 | int bc_ptrs[XFS_BTREE_MAXLEVELS]; /* key/record # */ | |
204 | __uint8_t bc_ra[XFS_BTREE_MAXLEVELS]; /* readahead bits */ | |
205 | #define XFS_BTCUR_LEFTRA 1 /* left sibling has been read-ahead */ | |
206 | #define XFS_BTCUR_RIGHTRA 2 /* right sibling has been read-ahead */ | |
207 | __uint8_t bc_nlevels; /* number of levels in the tree */ | |
208 | __uint8_t bc_blocklog; /* log2(blocksize) of btree blocks */ | |
209 | xfs_btnum_t bc_btnum; /* identifies which btree type */ | |
210 | union { | |
169d6227 CH |
211 | struct { /* needed for BNO, CNT, INO */ |
212 | struct xfs_buf *agbp; /* agf/agi buffer pointer */ | |
1da177e4 LT |
213 | xfs_agnumber_t agno; /* ag number */ |
214 | } a; | |
215 | struct { /* needed for BMAP */ | |
216 | struct xfs_inode *ip; /* pointer to our inode */ | |
217 | struct xfs_bmap_free *flist; /* list to free after */ | |
218 | xfs_fsblock_t firstblock; /* 1st blk allocated */ | |
219 | int allocated; /* count of alloced */ | |
220 | short forksize; /* fork's inode space */ | |
221 | char whichfork; /* data or attr fork */ | |
222 | char flags; /* flags */ | |
223 | #define XFS_BTCUR_BPRV_WASDEL 1 /* was delayed */ | |
224 | } b; | |
1da177e4 LT |
225 | } bc_private; /* per-btree type data */ |
226 | } xfs_btree_cur_t; | |
227 | ||
8186e517 | 228 | /* cursor flags */ |
e99ab90d | 229 | #define XFS_BTREE_LONG_PTRS (1<<0) /* pointers are 64bits long */ |
8186e517 CH |
230 | #define XFS_BTREE_ROOT_IN_INODE (1<<1) /* root may be variable size */ |
231 | ||
232 | ||
1da177e4 LT |
233 | #define XFS_BTREE_NOERROR 0 |
234 | #define XFS_BTREE_ERROR 1 | |
235 | ||
236 | /* | |
237 | * Convert from buffer to btree block header. | |
238 | */ | |
a844f451 NS |
239 | #define XFS_BUF_TO_BLOCK(bp) ((xfs_btree_block_t *)XFS_BUF_PTR(bp)) |
240 | #define XFS_BUF_TO_LBLOCK(bp) ((xfs_btree_lblock_t *)XFS_BUF_PTR(bp)) | |
241 | #define XFS_BUF_TO_SBLOCK(bp) ((xfs_btree_sblock_t *)XFS_BUF_PTR(bp)) | |
242 | ||
1da177e4 LT |
243 | |
244 | #ifdef __KERNEL__ | |
245 | ||
1da177e4 | 246 | /* |
a23f6ef8 | 247 | * Check that long form block header is ok. |
1da177e4 | 248 | */ |
a23f6ef8 CH |
249 | int /* error (0 or EFSCORRUPTED) */ |
250 | xfs_btree_check_lblock( | |
251 | struct xfs_btree_cur *cur, /* btree cursor */ | |
252 | struct xfs_btree_lblock *block, /* btree long form block pointer */ | |
1da177e4 LT |
253 | int level, /* level of the btree block */ |
254 | struct xfs_buf *bp); /* buffer containing block, if any */ | |
255 | ||
256 | /* | |
a23f6ef8 | 257 | * Check that short form block header is ok. |
1da177e4 | 258 | */ |
a23f6ef8 CH |
259 | int /* error (0 or EFSCORRUPTED) */ |
260 | xfs_btree_check_sblock( | |
261 | struct xfs_btree_cur *cur, /* btree cursor */ | |
262 | struct xfs_btree_sblock *block, /* btree short form block pointer */ | |
263 | int level, /* level of the btree block */ | |
264 | struct xfs_buf *bp); /* buffer containing block */ | |
1da177e4 LT |
265 | |
266 | /* | |
a23f6ef8 | 267 | * Check that block header is ok. |
1da177e4 | 268 | */ |
a23f6ef8 CH |
269 | int |
270 | xfs_btree_check_block( | |
271 | struct xfs_btree_cur *cur, /* btree cursor */ | |
272 | struct xfs_btree_block *block, /* generic btree block pointer */ | |
1da177e4 LT |
273 | int level, /* level of the btree block */ |
274 | struct xfs_buf *bp); /* buffer containing block, if any */ | |
275 | ||
276 | /* | |
a23f6ef8 | 277 | * Check that (long) pointer is ok. |
1da177e4 LT |
278 | */ |
279 | int /* error (0 or EFSCORRUPTED) */ | |
280 | xfs_btree_check_lptr( | |
a23f6ef8 | 281 | struct xfs_btree_cur *cur, /* btree cursor */ |
1da177e4 LT |
282 | xfs_dfsbno_t ptr, /* btree block disk address */ |
283 | int level); /* btree block level */ | |
284 | ||
b113bcb8 | 285 | #define xfs_btree_check_lptr_disk(cur, ptr, level) \ |
576039cf | 286 | xfs_btree_check_lptr(cur, be64_to_cpu(ptr), level) |
b113bcb8 | 287 | |
a23f6ef8 | 288 | |
1da177e4 | 289 | /* |
a23f6ef8 | 290 | * Check that (short) pointer is ok. |
1da177e4 LT |
291 | */ |
292 | int /* error (0 or EFSCORRUPTED) */ | |
a23f6ef8 CH |
293 | xfs_btree_check_sptr( |
294 | struct xfs_btree_cur *cur, /* btree cursor */ | |
295 | xfs_agblock_t ptr, /* btree block disk address */ | |
296 | int level); /* btree block level */ | |
1da177e4 LT |
297 | |
298 | /* | |
a23f6ef8 | 299 | * Check that (short) pointer is ok. |
1da177e4 LT |
300 | */ |
301 | int /* error (0 or EFSCORRUPTED) */ | |
a23f6ef8 CH |
302 | xfs_btree_check_ptr( |
303 | struct xfs_btree_cur *cur, /* btree cursor */ | |
304 | union xfs_btree_ptr *ptr, /* btree block disk address */ | |
305 | int index, /* offset from ptr to check */ | |
1da177e4 LT |
306 | int level); /* btree block level */ |
307 | ||
a23f6ef8 CH |
308 | #ifdef DEBUG |
309 | ||
310 | /* | |
311 | * Debug routine: check that keys are in the right order. | |
312 | */ | |
313 | void | |
314 | xfs_btree_check_key( | |
315 | xfs_btnum_t btnum, /* btree identifier */ | |
316 | void *ak1, /* pointer to left (lower) key */ | |
317 | void *ak2); /* pointer to right (higher) key */ | |
318 | ||
319 | /* | |
320 | * Debug routine: check that records are in the right order. | |
321 | */ | |
322 | void | |
323 | xfs_btree_check_rec( | |
324 | xfs_btnum_t btnum, /* btree identifier */ | |
325 | void *ar1, /* pointer to left (lower) record */ | |
326 | void *ar2); /* pointer to right (higher) record */ | |
327 | #else | |
328 | #define xfs_btree_check_key(a, b, c) | |
329 | #define xfs_btree_check_rec(a, b, c) | |
330 | #endif /* DEBUG */ | |
331 | ||
1da177e4 LT |
332 | /* |
333 | * Delete the btree cursor. | |
334 | */ | |
335 | void | |
336 | xfs_btree_del_cursor( | |
337 | xfs_btree_cur_t *cur, /* btree cursor */ | |
338 | int error); /* del because of error */ | |
339 | ||
340 | /* | |
341 | * Duplicate the btree cursor. | |
342 | * Allocate a new one, copy the record, re-get the buffers. | |
343 | */ | |
344 | int /* error */ | |
345 | xfs_btree_dup_cursor( | |
346 | xfs_btree_cur_t *cur, /* input cursor */ | |
347 | xfs_btree_cur_t **ncur);/* output cursor */ | |
348 | ||
349 | /* | |
350 | * Change the cursor to point to the first record in the current block | |
351 | * at the given level. Other levels are unaffected. | |
352 | */ | |
353 | int /* success=1, failure=0 */ | |
354 | xfs_btree_firstrec( | |
355 | xfs_btree_cur_t *cur, /* btree cursor */ | |
356 | int level); /* level to change */ | |
357 | ||
1da177e4 LT |
358 | /* |
359 | * Get a buffer for the block, return it with no data read. | |
360 | * Long-form addressing. | |
361 | */ | |
362 | struct xfs_buf * /* buffer for fsbno */ | |
363 | xfs_btree_get_bufl( | |
364 | struct xfs_mount *mp, /* file system mount point */ | |
365 | struct xfs_trans *tp, /* transaction pointer */ | |
366 | xfs_fsblock_t fsbno, /* file system block number */ | |
367 | uint lock); /* lock flags for get_buf */ | |
368 | ||
369 | /* | |
370 | * Get a buffer for the block, return it with no data read. | |
371 | * Short-form addressing. | |
372 | */ | |
373 | struct xfs_buf * /* buffer for agno/agbno */ | |
374 | xfs_btree_get_bufs( | |
375 | struct xfs_mount *mp, /* file system mount point */ | |
376 | struct xfs_trans *tp, /* transaction pointer */ | |
377 | xfs_agnumber_t agno, /* allocation group number */ | |
378 | xfs_agblock_t agbno, /* allocation group block number */ | |
379 | uint lock); /* lock flags for get_buf */ | |
380 | ||
1da177e4 LT |
381 | /* |
382 | * Check for the cursor referring to the last block at the given level. | |
383 | */ | |
384 | int /* 1=is last block, 0=not last block */ | |
385 | xfs_btree_islastblock( | |
386 | xfs_btree_cur_t *cur, /* btree cursor */ | |
387 | int level); /* level to check */ | |
388 | ||
389 | /* | |
390 | * Change the cursor to point to the last record in the current block | |
391 | * at the given level. Other levels are unaffected. | |
392 | */ | |
393 | int /* success=1, failure=0 */ | |
394 | xfs_btree_lastrec( | |
395 | xfs_btree_cur_t *cur, /* btree cursor */ | |
396 | int level); /* level to change */ | |
397 | ||
398 | /* | |
399 | * Compute first and last byte offsets for the fields given. | |
400 | * Interprets the offsets table, which contains struct field offsets. | |
401 | */ | |
402 | void | |
403 | xfs_btree_offsets( | |
404 | __int64_t fields, /* bitmask of fields */ | |
405 | const short *offsets,/* table of field offsets */ | |
406 | int nbits, /* number of bits to inspect */ | |
407 | int *first, /* output: first byte offset */ | |
408 | int *last); /* output: last byte offset */ | |
409 | ||
410 | /* | |
411 | * Get a buffer for the block, return it read in. | |
412 | * Long-form addressing. | |
413 | */ | |
414 | int /* error */ | |
415 | xfs_btree_read_bufl( | |
416 | struct xfs_mount *mp, /* file system mount point */ | |
417 | struct xfs_trans *tp, /* transaction pointer */ | |
418 | xfs_fsblock_t fsbno, /* file system block number */ | |
419 | uint lock, /* lock flags for read_buf */ | |
420 | struct xfs_buf **bpp, /* buffer for fsbno */ | |
421 | int refval);/* ref count value for buffer */ | |
422 | ||
423 | /* | |
424 | * Get a buffer for the block, return it read in. | |
425 | * Short-form addressing. | |
426 | */ | |
427 | int /* error */ | |
428 | xfs_btree_read_bufs( | |
429 | struct xfs_mount *mp, /* file system mount point */ | |
430 | struct xfs_trans *tp, /* transaction pointer */ | |
431 | xfs_agnumber_t agno, /* allocation group number */ | |
432 | xfs_agblock_t agbno, /* allocation group block number */ | |
433 | uint lock, /* lock flags for read_buf */ | |
434 | struct xfs_buf **bpp, /* buffer for agno/agbno */ | |
435 | int refval);/* ref count value for buffer */ | |
436 | ||
437 | /* | |
438 | * Read-ahead the block, don't wait for it, don't return a buffer. | |
439 | * Long-form addressing. | |
440 | */ | |
441 | void /* error */ | |
442 | xfs_btree_reada_bufl( | |
443 | struct xfs_mount *mp, /* file system mount point */ | |
444 | xfs_fsblock_t fsbno, /* file system block number */ | |
445 | xfs_extlen_t count); /* count of filesystem blocks */ | |
446 | ||
447 | /* | |
448 | * Read-ahead the block, don't wait for it, don't return a buffer. | |
449 | * Short-form addressing. | |
450 | */ | |
451 | void /* error */ | |
452 | xfs_btree_reada_bufs( | |
453 | struct xfs_mount *mp, /* file system mount point */ | |
454 | xfs_agnumber_t agno, /* allocation group number */ | |
455 | xfs_agblock_t agbno, /* allocation group block number */ | |
456 | xfs_extlen_t count); /* count of filesystem blocks */ | |
457 | ||
458 | /* | |
459 | * Read-ahead btree blocks, at the given level. | |
460 | * Bits in lr are set from XFS_BTCUR_{LEFT,RIGHT}RA. | |
461 | */ | |
462 | int /* readahead block count */ | |
1da177e4 LT |
463 | xfs_btree_readahead( |
464 | xfs_btree_cur_t *cur, /* btree cursor */ | |
465 | int lev, /* level in btree */ | |
b524bfee | 466 | int lr); /* left/right bits */ |
1da177e4 LT |
467 | |
468 | /* | |
469 | * Set the buffer for level "lev" in the cursor to bp, releasing | |
470 | * any previous buffer. | |
471 | */ | |
472 | void | |
473 | xfs_btree_setbuf( | |
474 | xfs_btree_cur_t *cur, /* btree cursor */ | |
475 | int lev, /* level in btree */ | |
476 | struct xfs_buf *bp); /* new buffer to set */ | |
477 | ||
478 | #endif /* __KERNEL__ */ | |
479 | ||
480 | ||
481 | /* | |
482 | * Min and max functions for extlen, agblock, fileoff, and filblks types. | |
483 | */ | |
54aa8e26 DC |
484 | #define XFS_EXTLEN_MIN(a,b) min_t(xfs_extlen_t, (a), (b)) |
485 | #define XFS_EXTLEN_MAX(a,b) max_t(xfs_extlen_t, (a), (b)) | |
486 | #define XFS_AGBLOCK_MIN(a,b) min_t(xfs_agblock_t, (a), (b)) | |
487 | #define XFS_AGBLOCK_MAX(a,b) max_t(xfs_agblock_t, (a), (b)) | |
488 | #define XFS_FILEOFF_MIN(a,b) min_t(xfs_fileoff_t, (a), (b)) | |
489 | #define XFS_FILEOFF_MAX(a,b) max_t(xfs_fileoff_t, (a), (b)) | |
490 | #define XFS_FILBLKS_MIN(a,b) min_t(xfs_filblks_t, (a), (b)) | |
491 | #define XFS_FILBLKS_MAX(a,b) max_t(xfs_filblks_t, (a), (b)) | |
a844f451 | 492 | |
1da177e4 LT |
493 | #define XFS_FSB_SANITY_CHECK(mp,fsb) \ |
494 | (XFS_FSB_TO_AGNO(mp, fsb) < mp->m_sb.sb_agcount && \ | |
a844f451 | 495 | XFS_FSB_TO_AGBNO(mp, fsb) < mp->m_sb.sb_agblocks) |
1da177e4 LT |
496 | |
497 | #endif /* __XFS_BTREE_H__ */ |