Merge commit 'v2.6.29-rc1' into perfcounters/core
[linux-2.6] / fs / xfs / xfs_ialloc_btree.c
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 #include "xfs.h"
19 #include "xfs_fs.h"
20 #include "xfs_types.h"
21 #include "xfs_bit.h"
22 #include "xfs_log.h"
23 #include "xfs_inum.h"
24 #include "xfs_trans.h"
25 #include "xfs_sb.h"
26 #include "xfs_ag.h"
27 #include "xfs_dir2.h"
28 #include "xfs_dmapi.h"
29 #include "xfs_mount.h"
30 #include "xfs_bmap_btree.h"
31 #include "xfs_alloc_btree.h"
32 #include "xfs_ialloc_btree.h"
33 #include "xfs_dir2_sf.h"
34 #include "xfs_attr_sf.h"
35 #include "xfs_dinode.h"
36 #include "xfs_inode.h"
37 #include "xfs_btree.h"
38 #include "xfs_btree_trace.h"
39 #include "xfs_ialloc.h"
40 #include "xfs_alloc.h"
41 #include "xfs_error.h"
42
43
44 STATIC int
45 xfs_inobt_get_minrecs(
46         struct xfs_btree_cur    *cur,
47         int                     level)
48 {
49         return cur->bc_mp->m_inobt_mnr[level != 0];
50 }
51
52 STATIC struct xfs_btree_cur *
53 xfs_inobt_dup_cursor(
54         struct xfs_btree_cur    *cur)
55 {
56         return xfs_inobt_init_cursor(cur->bc_mp, cur->bc_tp,
57                         cur->bc_private.a.agbp, cur->bc_private.a.agno);
58 }
59
60 STATIC void
61 xfs_inobt_set_root(
62         struct xfs_btree_cur    *cur,
63         union xfs_btree_ptr     *nptr,
64         int                     inc)    /* level change */
65 {
66         struct xfs_buf          *agbp = cur->bc_private.a.agbp;
67         struct xfs_agi          *agi = XFS_BUF_TO_AGI(agbp);
68
69         agi->agi_root = nptr->s;
70         be32_add_cpu(&agi->agi_level, inc);
71         xfs_ialloc_log_agi(cur->bc_tp, agbp, XFS_AGI_ROOT | XFS_AGI_LEVEL);
72 }
73
74 STATIC int
75 xfs_inobt_alloc_block(
76         struct xfs_btree_cur    *cur,
77         union xfs_btree_ptr     *start,
78         union xfs_btree_ptr     *new,
79         int                     length,
80         int                     *stat)
81 {
82         xfs_alloc_arg_t         args;           /* block allocation args */
83         int                     error;          /* error return value */
84         xfs_agblock_t           sbno = be32_to_cpu(start->s);
85
86         XFS_BTREE_TRACE_CURSOR(cur, XBT_ENTRY);
87
88         memset(&args, 0, sizeof(args));
89         args.tp = cur->bc_tp;
90         args.mp = cur->bc_mp;
91         args.fsbno = XFS_AGB_TO_FSB(args.mp, cur->bc_private.a.agno, sbno);
92         args.minlen = 1;
93         args.maxlen = 1;
94         args.prod = 1;
95         args.type = XFS_ALLOCTYPE_NEAR_BNO;
96
97         error = xfs_alloc_vextent(&args);
98         if (error) {
99                 XFS_BTREE_TRACE_CURSOR(cur, XBT_ERROR);
100                 return error;
101         }
102         if (args.fsbno == NULLFSBLOCK) {
103                 XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT);
104                 *stat = 0;
105                 return 0;
106         }
107         ASSERT(args.len == 1);
108         XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT);
109
110         new->s = cpu_to_be32(XFS_FSB_TO_AGBNO(args.mp, args.fsbno));
111         *stat = 1;
112         return 0;
113 }
114
115 STATIC int
116 xfs_inobt_free_block(
117         struct xfs_btree_cur    *cur,
118         struct xfs_buf          *bp)
119 {
120         xfs_fsblock_t           fsbno;
121         int                     error;
122
123         fsbno = XFS_DADDR_TO_FSB(cur->bc_mp, XFS_BUF_ADDR(bp));
124         error = xfs_free_extent(cur->bc_tp, fsbno, 1);
125         if (error)
126                 return error;
127
128         xfs_trans_binval(cur->bc_tp, bp);
129         return error;
130 }
131
132 STATIC int
133 xfs_inobt_get_maxrecs(
134         struct xfs_btree_cur    *cur,
135         int                     level)
136 {
137         return cur->bc_mp->m_inobt_mxr[level != 0];
138 }
139
140 STATIC void
141 xfs_inobt_init_key_from_rec(
142         union xfs_btree_key     *key,
143         union xfs_btree_rec     *rec)
144 {
145         key->inobt.ir_startino = rec->inobt.ir_startino;
146 }
147
148 STATIC void
149 xfs_inobt_init_rec_from_key(
150         union xfs_btree_key     *key,
151         union xfs_btree_rec     *rec)
152 {
153         rec->inobt.ir_startino = key->inobt.ir_startino;
154 }
155
156 STATIC void
157 xfs_inobt_init_rec_from_cur(
158         struct xfs_btree_cur    *cur,
159         union xfs_btree_rec     *rec)
160 {
161         rec->inobt.ir_startino = cpu_to_be32(cur->bc_rec.i.ir_startino);
162         rec->inobt.ir_freecount = cpu_to_be32(cur->bc_rec.i.ir_freecount);
163         rec->inobt.ir_free = cpu_to_be64(cur->bc_rec.i.ir_free);
164 }
165
166 /*
167  * intial value of ptr for lookup
168  */
169 STATIC void
170 xfs_inobt_init_ptr_from_cur(
171         struct xfs_btree_cur    *cur,
172         union xfs_btree_ptr     *ptr)
173 {
174         struct xfs_agi          *agi = XFS_BUF_TO_AGI(cur->bc_private.a.agbp);
175
176         ASSERT(cur->bc_private.a.agno == be32_to_cpu(agi->agi_seqno));
177
178         ptr->s = agi->agi_root;
179 }
180
181 STATIC __int64_t
182 xfs_inobt_key_diff(
183         struct xfs_btree_cur    *cur,
184         union xfs_btree_key     *key)
185 {
186         return (__int64_t)be32_to_cpu(key->inobt.ir_startino) -
187                           cur->bc_rec.i.ir_startino;
188 }
189
190 STATIC int
191 xfs_inobt_kill_root(
192         struct xfs_btree_cur    *cur,
193         struct xfs_buf          *bp,
194         int                     level,
195         union xfs_btree_ptr     *newroot)
196 {
197         int                     error;
198
199         XFS_BTREE_TRACE_CURSOR(cur, XBT_ENTRY);
200         XFS_BTREE_STATS_INC(cur, killroot);
201
202         /*
203          * Update the root pointer, decreasing the level by 1 and then
204          * free the old root.
205          */
206         xfs_inobt_set_root(cur, newroot, -1);
207         error = xfs_inobt_free_block(cur, bp);
208         if (error) {
209                 XFS_BTREE_TRACE_CURSOR(cur, XBT_ERROR);
210                 return error;
211         }
212
213         XFS_BTREE_STATS_INC(cur, free);
214
215         cur->bc_bufs[level] = NULL;
216         cur->bc_nlevels--;
217
218         XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT);
219         return 0;
220 }
221
222 #ifdef DEBUG
223 STATIC int
224 xfs_inobt_keys_inorder(
225         struct xfs_btree_cur    *cur,
226         union xfs_btree_key     *k1,
227         union xfs_btree_key     *k2)
228 {
229         return be32_to_cpu(k1->inobt.ir_startino) <
230                 be32_to_cpu(k2->inobt.ir_startino);
231 }
232
233 STATIC int
234 xfs_inobt_recs_inorder(
235         struct xfs_btree_cur    *cur,
236         union xfs_btree_rec     *r1,
237         union xfs_btree_rec     *r2)
238 {
239         return be32_to_cpu(r1->inobt.ir_startino) + XFS_INODES_PER_CHUNK <=
240                 be32_to_cpu(r2->inobt.ir_startino);
241 }
242 #endif  /* DEBUG */
243
244 #ifdef XFS_BTREE_TRACE
245 ktrace_t        *xfs_inobt_trace_buf;
246
247 STATIC void
248 xfs_inobt_trace_enter(
249         struct xfs_btree_cur    *cur,
250         const char              *func,
251         char                    *s,
252         int                     type,
253         int                     line,
254         __psunsigned_t          a0,
255         __psunsigned_t          a1,
256         __psunsigned_t          a2,
257         __psunsigned_t          a3,
258         __psunsigned_t          a4,
259         __psunsigned_t          a5,
260         __psunsigned_t          a6,
261         __psunsigned_t          a7,
262         __psunsigned_t          a8,
263         __psunsigned_t          a9,
264         __psunsigned_t          a10)
265 {
266         ktrace_enter(xfs_inobt_trace_buf, (void *)(__psint_t)type,
267                 (void *)func, (void *)s, NULL, (void *)cur,
268                 (void *)a0, (void *)a1, (void *)a2, (void *)a3,
269                 (void *)a4, (void *)a5, (void *)a6, (void *)a7,
270                 (void *)a8, (void *)a9, (void *)a10);
271 }
272
273 STATIC void
274 xfs_inobt_trace_cursor(
275         struct xfs_btree_cur    *cur,
276         __uint32_t              *s0,
277         __uint64_t              *l0,
278         __uint64_t              *l1)
279 {
280         *s0 = cur->bc_private.a.agno;
281         *l0 = cur->bc_rec.i.ir_startino;
282         *l1 = cur->bc_rec.i.ir_free;
283 }
284
285 STATIC void
286 xfs_inobt_trace_key(
287         struct xfs_btree_cur    *cur,
288         union xfs_btree_key     *key,
289         __uint64_t              *l0,
290         __uint64_t              *l1)
291 {
292         *l0 = be32_to_cpu(key->inobt.ir_startino);
293         *l1 = 0;
294 }
295
296 STATIC void
297 xfs_inobt_trace_record(
298         struct xfs_btree_cur    *cur,
299         union xfs_btree_rec     *rec,
300         __uint64_t              *l0,
301         __uint64_t              *l1,
302         __uint64_t              *l2)
303 {
304         *l0 = be32_to_cpu(rec->inobt.ir_startino);
305         *l1 = be32_to_cpu(rec->inobt.ir_freecount);
306         *l2 = be64_to_cpu(rec->inobt.ir_free);
307 }
308 #endif /* XFS_BTREE_TRACE */
309
310 static const struct xfs_btree_ops xfs_inobt_ops = {
311         .rec_len                = sizeof(xfs_inobt_rec_t),
312         .key_len                = sizeof(xfs_inobt_key_t),
313
314         .dup_cursor             = xfs_inobt_dup_cursor,
315         .set_root               = xfs_inobt_set_root,
316         .kill_root              = xfs_inobt_kill_root,
317         .alloc_block            = xfs_inobt_alloc_block,
318         .free_block             = xfs_inobt_free_block,
319         .get_minrecs            = xfs_inobt_get_minrecs,
320         .get_maxrecs            = xfs_inobt_get_maxrecs,
321         .init_key_from_rec      = xfs_inobt_init_key_from_rec,
322         .init_rec_from_key      = xfs_inobt_init_rec_from_key,
323         .init_rec_from_cur      = xfs_inobt_init_rec_from_cur,
324         .init_ptr_from_cur      = xfs_inobt_init_ptr_from_cur,
325         .key_diff               = xfs_inobt_key_diff,
326
327 #ifdef DEBUG
328         .keys_inorder           = xfs_inobt_keys_inorder,
329         .recs_inorder           = xfs_inobt_recs_inorder,
330 #endif
331
332 #ifdef XFS_BTREE_TRACE
333         .trace_enter            = xfs_inobt_trace_enter,
334         .trace_cursor           = xfs_inobt_trace_cursor,
335         .trace_key              = xfs_inobt_trace_key,
336         .trace_record           = xfs_inobt_trace_record,
337 #endif
338 };
339
340 /*
341  * Allocate a new inode btree cursor.
342  */
343 struct xfs_btree_cur *                          /* new inode btree cursor */
344 xfs_inobt_init_cursor(
345         struct xfs_mount        *mp,            /* file system mount point */
346         struct xfs_trans        *tp,            /* transaction pointer */
347         struct xfs_buf          *agbp,          /* buffer for agi structure */
348         xfs_agnumber_t          agno)           /* allocation group number */
349 {
350         struct xfs_agi          *agi = XFS_BUF_TO_AGI(agbp);
351         struct xfs_btree_cur    *cur;
352
353         cur = kmem_zone_zalloc(xfs_btree_cur_zone, KM_SLEEP);
354
355         cur->bc_tp = tp;
356         cur->bc_mp = mp;
357         cur->bc_nlevels = be32_to_cpu(agi->agi_level);
358         cur->bc_btnum = XFS_BTNUM_INO;
359         cur->bc_blocklog = mp->m_sb.sb_blocklog;
360
361         cur->bc_ops = &xfs_inobt_ops;
362
363         cur->bc_private.a.agbp = agbp;
364         cur->bc_private.a.agno = agno;
365
366         return cur;
367 }
368
369 /*
370  * Calculate number of records in an inobt btree block.
371  */
372 int
373 xfs_inobt_maxrecs(
374         struct xfs_mount        *mp,
375         int                     blocklen,
376         int                     leaf)
377 {
378         blocklen -= XFS_INOBT_BLOCK_LEN(mp);
379
380         if (leaf)
381                 return blocklen / sizeof(xfs_inobt_rec_t);
382         return blocklen / (sizeof(xfs_inobt_key_t) + sizeof(xfs_inobt_ptr_t));
383 }