2 * Copyright (c) 2000-2001,2005 Silicon Graphics, Inc.
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.
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.
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
18 #ifndef __XFS_BTREE_H__
19 #define __XFS_BTREE_H__
27 extern kmem_zone_t *xfs_btree_cur_zone;
30 * This nonsense is to make -wlint happy.
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)
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)
42 * Short form header: space allocation btrees.
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 */
53 * Long form header: bmap btrees.
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 */
64 * Combined header and structure, used by common code.
66 typedef struct xfs_btree_block {
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 */
74 } s; /* short form pointers */
78 } l; /* long form pointers */
83 * Generic key, ptr and record wrapper structures.
85 * These are disk format structures, and are converted where necessary
86 * by the btree specific code that needs to interpret them.
89 __be32 s; /* short form ptr */
90 __be64 l; /* long form ptr */
95 xfs_bmdr_key_t bmbr; /* bmbt root block */
96 xfs_alloc_key_t alloc;
97 xfs_inobt_key_t inobt;
100 union xfs_btree_rec {
102 xfs_bmdr_rec_t bmbr; /* bmbt root block */
103 xfs_alloc_rec_t alloc;
104 xfs_inobt_rec_t inobt;
108 * For logging record fields.
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)
119 * Magic numbers for btree blocks.
121 extern const __uint32_t xfs_magics[];
124 * Generic stats interface
126 #define __XFS_BTREE_STATS_INC(type, stat) \
127 XFS_STATS_INC(xs_ ## type ## _2_ ## stat)
128 #define XFS_BTREE_STATS_INC(cur, stat) \
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; \
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) \
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; \
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
157 #define XFS_BTREE_BLOCK_MAXRECS(bsz,t,lf) \
158 ((int)(((bsz) - (uint)sizeof(t ## _block_t)) / \
159 (((lf) * (uint)sizeof(t ## _rec_t)) + \
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)
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).
170 #define XFS_BTREE_REC_ADDR(t,bb,i) \
171 ((t ## _rec_t *)((char *)(bb) + sizeof(t ## _block_t) + \
172 ((i) - 1) * sizeof(t ## _rec_t)))
173 #define XFS_BTREE_KEY_ADDR(t,bb,i) \
174 ((t ## _key_t *)((char *)(bb) + sizeof(t ## _block_t) + \
175 ((i) - 1) * sizeof(t ## _key_t)))
176 #define XFS_BTREE_PTR_ADDR(t,bb,i,mxr) \
177 ((t ## _ptr_t *)((char *)(bb) + sizeof(t ## _block_t) + \
178 (mxr) * sizeof(t ## _key_t) + ((i) - 1) * sizeof(t ## _ptr_t)))
180 #define XFS_BTREE_MAXLEVELS 8 /* max of all btrees */
182 struct xfs_btree_ops {
183 /* cursor operations */
184 struct xfs_btree_cur *(*dup_cursor)(struct xfs_btree_cur *);
188 * Btree cursor structure.
189 * This collects all information needed by the btree code in one place.
191 typedef struct xfs_btree_cur
193 struct xfs_trans *bc_tp; /* transaction we're in, if any */
194 struct xfs_mount *bc_mp; /* file system mount struct */
195 const struct xfs_btree_ops *bc_ops;
196 uint bc_flags; /* btree features - below */
198 xfs_alloc_rec_incore_t a;
200 xfs_inobt_rec_incore_t i;
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 */
211 struct { /* needed for BNO, CNT, INO */
212 struct xfs_buf *agbp; /* agf/agi buffer pointer */
213 xfs_agnumber_t agno; /* ag number */
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 */
225 } bc_private; /* per-btree type data */
229 #define XFS_BTREE_LONG_PTRS (1<<0) /* pointers are 64bits long */
230 #define XFS_BTREE_ROOT_IN_INODE (1<<1) /* root may be variable size */
233 #define XFS_BTREE_NOERROR 0
234 #define XFS_BTREE_ERROR 1
237 * Convert from buffer to btree block header.
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))
247 * Check that long form block header is ok.
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 */
253 int level, /* level of the btree block */
254 struct xfs_buf *bp); /* buffer containing block, if any */
257 * Check that short form block header is ok.
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 */
267 * Check that block header is ok.
270 xfs_btree_check_block(
271 struct xfs_btree_cur *cur, /* btree cursor */
272 struct xfs_btree_block *block, /* generic btree block pointer */
273 int level, /* level of the btree block */
274 struct xfs_buf *bp); /* buffer containing block, if any */
277 * Check that (long) pointer is ok.
279 int /* error (0 or EFSCORRUPTED) */
280 xfs_btree_check_lptr(
281 struct xfs_btree_cur *cur, /* btree cursor */
282 xfs_dfsbno_t ptr, /* btree block disk address */
283 int level); /* btree block level */
285 #define xfs_btree_check_lptr_disk(cur, ptr, level) \
286 xfs_btree_check_lptr(cur, be64_to_cpu(ptr), level)
290 * Check that (short) pointer is ok.
292 int /* error (0 or EFSCORRUPTED) */
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 */
299 * Check that (short) pointer is ok.
301 int /* error (0 or EFSCORRUPTED) */
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 */
306 int level); /* btree block level */
311 * Debug routine: check that keys are in the right order.
315 xfs_btnum_t btnum, /* btree identifier */
316 void *ak1, /* pointer to left (lower) key */
317 void *ak2); /* pointer to right (higher) key */
320 * Debug routine: check that records are in the right order.
324 xfs_btnum_t btnum, /* btree identifier */
325 void *ar1, /* pointer to left (lower) record */
326 void *ar2); /* pointer to right (higher) record */
328 #define xfs_btree_check_key(a, b, c)
329 #define xfs_btree_check_rec(a, b, c)
333 * Delete the btree cursor.
336 xfs_btree_del_cursor(
337 xfs_btree_cur_t *cur, /* btree cursor */
338 int error); /* del because of error */
341 * Duplicate the btree cursor.
342 * Allocate a new one, copy the record, re-get the buffers.
345 xfs_btree_dup_cursor(
346 xfs_btree_cur_t *cur, /* input cursor */
347 xfs_btree_cur_t **ncur);/* output cursor */
350 * Change the cursor to point to the first record in the current block
351 * at the given level. Other levels are unaffected.
353 int /* success=1, failure=0 */
355 xfs_btree_cur_t *cur, /* btree cursor */
356 int level); /* level to change */
359 * Get a buffer for the block, return it with no data read.
360 * Long-form addressing.
362 struct xfs_buf * /* buffer for fsbno */
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 */
370 * Get a buffer for the block, return it with no data read.
371 * Short-form addressing.
373 struct xfs_buf * /* buffer for agno/agbno */
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 */
382 * Check for the cursor referring to the last block at the given level.
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 */
390 * Change the cursor to point to the last record in the current block
391 * at the given level. Other levels are unaffected.
393 int /* success=1, failure=0 */
395 xfs_btree_cur_t *cur, /* btree cursor */
396 int level); /* level to change */
399 * Compute first and last byte offsets for the fields given.
400 * Interprets the offsets table, which contains struct field 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 */
411 * Get a buffer for the block, return it read in.
412 * Long-form addressing.
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 */
424 * Get a buffer for the block, return it read in.
425 * Short-form addressing.
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 */
438 * Read-ahead the block, don't wait for it, don't return a buffer.
439 * Long-form addressing.
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 */
448 * Read-ahead the block, don't wait for it, don't return a buffer.
449 * Short-form addressing.
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 */
459 * Read-ahead btree blocks, at the given level.
460 * Bits in lr are set from XFS_BTCUR_{LEFT,RIGHT}RA.
462 int /* readahead block count */
464 xfs_btree_cur_t *cur, /* btree cursor */
465 int lev, /* level in btree */
466 int lr); /* left/right bits */
469 * Set the buffer for level "lev" in the cursor to bp, releasing
470 * any previous buffer.
474 xfs_btree_cur_t *cur, /* btree cursor */
475 int lev, /* level in btree */
476 struct xfs_buf *bp); /* new buffer to set */
478 #endif /* __KERNEL__ */
482 * Min and max functions for extlen, agblock, fileoff, and filblks types.
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))
493 #define XFS_FSB_SANITY_CHECK(mp,fsb) \
494 (XFS_FSB_TO_AGNO(mp, fsb) < mp->m_sb.sb_agcount && \
495 XFS_FSB_TO_AGBNO(mp, fsb) < mp->m_sb.sb_agblocks)
497 #endif /* __XFS_BTREE_H__ */