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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Nathan Scott7b718762005-11-02 14:58:39 +11002 * Copyright (c) 2000-2001,2005 Silicon Graphics, Inc.
3 * All Rights Reserved.
Linus Torvalds1da177e2005-04-16 15:20:36 -07004 *
Nathan Scott7b718762005-11-02 14:58:39 +11005 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License as
Linus Torvalds1da177e2005-04-16 15:20:36 -07007 * published by the Free Software Foundation.
8 *
Nathan Scott7b718762005-11-02 14:58:39 +11009 * 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.
Linus Torvalds1da177e2005-04-16 15:20:36 -070013 *
Nathan Scott7b718762005-11-02 14:58:39 +110014 * 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
Linus Torvalds1da177e2005-04-16 15:20:36 -070017 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070018#include "xfs.h"
Nathan Scotta844f452005-11-02 14:38:42 +110019#include "xfs_fs.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070020#include "xfs_types.h"
Nathan Scotta844f452005-11-02 14:38:42 +110021#include "xfs_bit.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070022#include "xfs_log.h"
23#include "xfs_trans.h"
24#include "xfs_sb.h"
25#include "xfs_ag.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070026#include "xfs_mount.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070027#include "xfs_bmap_btree.h"
Nathan Scotta844f452005-11-02 14:38:42 +110028#include "xfs_alloc_btree.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070029#include "xfs_ialloc_btree.h"
Nathan Scotta844f452005-11-02 14:38:42 +110030#include "xfs_dinode.h"
31#include "xfs_inode.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070032#include "xfs_btree.h"
33#include "xfs_ialloc.h"
34#include "xfs_alloc.h"
35#include "xfs_error.h"
Dave Chinner3d3e6f62012-11-12 22:54:08 +110036#include "xfs_trace.h"
Christoph Hellwigee1a47a2013-04-21 14:53:46 -050037#include "xfs_cksum.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070038
Linus Torvalds1da177e2005-04-16 15:20:36 -070039
Christoph Hellwig91cca5df2008-10-30 16:58:01 +110040STATIC int
41xfs_inobt_get_minrecs(
42 struct xfs_btree_cur *cur,
43 int level)
44{
45 return cur->bc_mp->m_inobt_mnr[level != 0];
46}
Linus Torvalds1da177e2005-04-16 15:20:36 -070047
Christoph Hellwig561f7d12008-10-30 16:53:59 +110048STATIC struct xfs_btree_cur *
49xfs_inobt_dup_cursor(
50 struct xfs_btree_cur *cur)
51{
52 return xfs_inobt_init_cursor(cur->bc_mp, cur->bc_tp,
53 cur->bc_private.a.agbp, cur->bc_private.a.agno);
54}
55
Christoph Hellwig344207c2008-10-30 16:57:16 +110056STATIC void
57xfs_inobt_set_root(
58 struct xfs_btree_cur *cur,
59 union xfs_btree_ptr *nptr,
60 int inc) /* level change */
61{
62 struct xfs_buf *agbp = cur->bc_private.a.agbp;
63 struct xfs_agi *agi = XFS_BUF_TO_AGI(agbp);
64
65 agi->agi_root = nptr->s;
66 be32_add_cpu(&agi->agi_level, inc);
67 xfs_ialloc_log_agi(cur->bc_tp, agbp, XFS_AGI_ROOT | XFS_AGI_LEVEL);
68}
69
Christoph Hellwigce5e42d2008-10-30 16:55:23 +110070STATIC int
Christoph Hellwigf5eb8e72008-10-30 16:57:03 +110071xfs_inobt_alloc_block(
72 struct xfs_btree_cur *cur,
73 union xfs_btree_ptr *start,
74 union xfs_btree_ptr *new,
75 int length,
76 int *stat)
77{
78 xfs_alloc_arg_t args; /* block allocation args */
79 int error; /* error return value */
80 xfs_agblock_t sbno = be32_to_cpu(start->s);
81
82 XFS_BTREE_TRACE_CURSOR(cur, XBT_ENTRY);
83
84 memset(&args, 0, sizeof(args));
85 args.tp = cur->bc_tp;
86 args.mp = cur->bc_mp;
87 args.fsbno = XFS_AGB_TO_FSB(args.mp, cur->bc_private.a.agno, sbno);
88 args.minlen = 1;
89 args.maxlen = 1;
90 args.prod = 1;
91 args.type = XFS_ALLOCTYPE_NEAR_BNO;
92
93 error = xfs_alloc_vextent(&args);
94 if (error) {
95 XFS_BTREE_TRACE_CURSOR(cur, XBT_ERROR);
96 return error;
97 }
98 if (args.fsbno == NULLFSBLOCK) {
99 XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT);
100 *stat = 0;
101 return 0;
102 }
103 ASSERT(args.len == 1);
104 XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT);
105
106 new->s = cpu_to_be32(XFS_FSB_TO_AGBNO(args.mp, args.fsbno));
107 *stat = 1;
108 return 0;
109}
110
Christoph Hellwigd4b3a4b2008-10-30 16:57:51 +1100111STATIC int
112xfs_inobt_free_block(
113 struct xfs_btree_cur *cur,
114 struct xfs_buf *bp)
115{
116 xfs_fsblock_t fsbno;
117 int error;
118
119 fsbno = XFS_DADDR_TO_FSB(cur->bc_mp, XFS_BUF_ADDR(bp));
120 error = xfs_free_extent(cur->bc_tp, fsbno, 1);
121 if (error)
122 return error;
123
124 xfs_trans_binval(cur->bc_tp, bp);
125 return error;
126}
Christoph Hellwigf5eb8e72008-10-30 16:57:03 +1100127
128STATIC int
Christoph Hellwigce5e42d2008-10-30 16:55:23 +1100129xfs_inobt_get_maxrecs(
130 struct xfs_btree_cur *cur,
131 int level)
132{
133 return cur->bc_mp->m_inobt_mxr[level != 0];
134}
135
Christoph Hellwigfe033cc2008-10-30 16:56:09 +1100136STATIC void
137xfs_inobt_init_key_from_rec(
138 union xfs_btree_key *key,
139 union xfs_btree_rec *rec)
140{
141 key->inobt.ir_startino = rec->inobt.ir_startino;
142}
143
Christoph Hellwig4b22a572008-10-30 16:57:40 +1100144STATIC void
145xfs_inobt_init_rec_from_key(
146 union xfs_btree_key *key,
147 union xfs_btree_rec *rec)
148{
149 rec->inobt.ir_startino = key->inobt.ir_startino;
150}
151
152STATIC void
153xfs_inobt_init_rec_from_cur(
154 struct xfs_btree_cur *cur,
155 union xfs_btree_rec *rec)
156{
157 rec->inobt.ir_startino = cpu_to_be32(cur->bc_rec.i.ir_startino);
158 rec->inobt.ir_freecount = cpu_to_be32(cur->bc_rec.i.ir_freecount);
159 rec->inobt.ir_free = cpu_to_be64(cur->bc_rec.i.ir_free);
160}
161
Christoph Hellwigfe033cc2008-10-30 16:56:09 +1100162/*
Malcolm Parsons9da096f2009-03-29 09:55:42 +0200163 * initial value of ptr for lookup
Christoph Hellwigfe033cc2008-10-30 16:56:09 +1100164 */
165STATIC void
166xfs_inobt_init_ptr_from_cur(
167 struct xfs_btree_cur *cur,
168 union xfs_btree_ptr *ptr)
169{
170 struct xfs_agi *agi = XFS_BUF_TO_AGI(cur->bc_private.a.agbp);
171
172 ASSERT(cur->bc_private.a.agno == be32_to_cpu(agi->agi_seqno));
173
174 ptr->s = agi->agi_root;
175}
176
177STATIC __int64_t
178xfs_inobt_key_diff(
179 struct xfs_btree_cur *cur,
180 union xfs_btree_key *key)
181{
182 return (__int64_t)be32_to_cpu(key->inobt.ir_startino) -
183 cur->bc_rec.i.ir_startino;
184}
185
Christoph Hellwigee1a47a2013-04-21 14:53:46 -0500186static int
Dave Chinner612cfbf2012-11-14 17:52:32 +1100187xfs_inobt_verify(
Dave Chinner3d3e6f62012-11-12 22:54:08 +1100188 struct xfs_buf *bp)
189{
190 struct xfs_mount *mp = bp->b_target->bt_mount;
191 struct xfs_btree_block *block = XFS_BUF_TO_BLOCK(bp);
Christoph Hellwigee1a47a2013-04-21 14:53:46 -0500192 struct xfs_perag *pag = bp->b_pag;
Dave Chinner3d3e6f62012-11-12 22:54:08 +1100193 unsigned int level;
Dave Chinner3d3e6f62012-11-12 22:54:08 +1100194
Christoph Hellwigee1a47a2013-04-21 14:53:46 -0500195 /*
196 * During growfs operations, we can't verify the exact owner as the
197 * perag is not fully initialised and hence not attached to the buffer.
198 *
199 * Similarly, during log recovery we will have a perag structure
200 * attached, but the agi information will not yet have been initialised
201 * from the on disk AGI. We don't currently use any of this information,
202 * but beware of the landmine (i.e. need to check pag->pagi_init) if we
203 * ever do.
204 */
205 switch (block->bb_magic) {
206 case cpu_to_be32(XFS_IBT_CRC_MAGIC):
207 if (!xfs_sb_version_hascrc(&mp->m_sb))
208 return false;
209 if (!uuid_equal(&block->bb_u.s.bb_uuid, &mp->m_sb.sb_uuid))
210 return false;
211 if (block->bb_u.s.bb_blkno != cpu_to_be64(bp->b_bn))
212 return false;
213 if (pag &&
214 be32_to_cpu(block->bb_u.s.bb_owner) != pag->pag_agno)
215 return false;
216 /* fall through */
217 case cpu_to_be32(XFS_IBT_MAGIC):
218 break;
219 default:
220 return 0;
221 }
222
223 /* numrecs and level verification */
Dave Chinner3d3e6f62012-11-12 22:54:08 +1100224 level = be16_to_cpu(block->bb_level);
Christoph Hellwigee1a47a2013-04-21 14:53:46 -0500225 if (level >= mp->m_in_maxlevels)
226 return false;
227 if (be16_to_cpu(block->bb_numrecs) > mp->m_inobt_mxr[level != 0])
228 return false;
Dave Chinner3d3e6f62012-11-12 22:54:08 +1100229
230 /* sibling pointer verification */
Christoph Hellwigee1a47a2013-04-21 14:53:46 -0500231 if (!block->bb_u.s.bb_leftsib ||
232 (be32_to_cpu(block->bb_u.s.bb_leftsib) >= mp->m_sb.sb_agblocks &&
233 block->bb_u.s.bb_leftsib != cpu_to_be32(NULLAGBLOCK)))
234 return false;
235 if (!block->bb_u.s.bb_rightsib ||
236 (be32_to_cpu(block->bb_u.s.bb_rightsib) >= mp->m_sb.sb_agblocks &&
237 block->bb_u.s.bb_rightsib != cpu_to_be32(NULLAGBLOCK)))
238 return false;
Dave Chinner3d3e6f62012-11-12 22:54:08 +1100239
Christoph Hellwigee1a47a2013-04-21 14:53:46 -0500240 return true;
Dave Chinner612cfbf2012-11-14 17:52:32 +1100241}
Dave Chinner3d3e6f62012-11-12 22:54:08 +1100242
Dave Chinner612cfbf2012-11-14 17:52:32 +1100243static void
Dave Chinner1813dd62012-11-14 17:54:40 +1100244xfs_inobt_read_verify(
245 struct xfs_buf *bp)
246{
Christoph Hellwigee1a47a2013-04-21 14:53:46 -0500247 if (!(xfs_btree_sblock_verify_crc(bp) &&
248 xfs_inobt_verify(bp))) {
249 trace_xfs_btree_corrupt(bp, _RET_IP_);
250 XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW,
251 bp->b_target->bt_mount, bp->b_addr);
252 xfs_buf_ioerror(bp, EFSCORRUPTED);
253 }
Dave Chinner1813dd62012-11-14 17:54:40 +1100254}
255
256static void
Dave Chinner612cfbf2012-11-14 17:52:32 +1100257xfs_inobt_write_verify(
258 struct xfs_buf *bp)
259{
Christoph Hellwigee1a47a2013-04-21 14:53:46 -0500260 if (!xfs_inobt_verify(bp)) {
261 trace_xfs_btree_corrupt(bp, _RET_IP_);
262 XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW,
263 bp->b_target->bt_mount, bp->b_addr);
264 xfs_buf_ioerror(bp, EFSCORRUPTED);
265 }
266 xfs_btree_sblock_calc_crc(bp);
267
Dave Chinner612cfbf2012-11-14 17:52:32 +1100268}
269
Dave Chinner1813dd62012-11-14 17:54:40 +1100270const struct xfs_buf_ops xfs_inobt_buf_ops = {
271 .verify_read = xfs_inobt_read_verify,
272 .verify_write = xfs_inobt_write_verify,
273};
Dave Chinner3d3e6f62012-11-12 22:54:08 +1100274
Dave Chinner742ae1e2013-04-30 21:39:34 +1000275#if defined(DEBUG) || defined(XFS_WARN)
Christoph Hellwig4a26e662008-10-30 16:58:32 +1100276STATIC int
277xfs_inobt_keys_inorder(
278 struct xfs_btree_cur *cur,
279 union xfs_btree_key *k1,
280 union xfs_btree_key *k2)
281{
282 return be32_to_cpu(k1->inobt.ir_startino) <
283 be32_to_cpu(k2->inobt.ir_startino);
284}
285
286STATIC int
287xfs_inobt_recs_inorder(
288 struct xfs_btree_cur *cur,
289 union xfs_btree_rec *r1,
290 union xfs_btree_rec *r2)
291{
292 return be32_to_cpu(r1->inobt.ir_startino) + XFS_INODES_PER_CHUNK <=
293 be32_to_cpu(r2->inobt.ir_startino);
294}
295#endif /* DEBUG */
296
Christoph Hellwig561f7d12008-10-30 16:53:59 +1100297static const struct xfs_btree_ops xfs_inobt_ops = {
Christoph Hellwig65f1eae2008-10-30 16:55:34 +1100298 .rec_len = sizeof(xfs_inobt_rec_t),
299 .key_len = sizeof(xfs_inobt_key_t),
300
Christoph Hellwig561f7d12008-10-30 16:53:59 +1100301 .dup_cursor = xfs_inobt_dup_cursor,
Christoph Hellwig344207c2008-10-30 16:57:16 +1100302 .set_root = xfs_inobt_set_root,
Christoph Hellwigf5eb8e72008-10-30 16:57:03 +1100303 .alloc_block = xfs_inobt_alloc_block,
Christoph Hellwigd4b3a4b2008-10-30 16:57:51 +1100304 .free_block = xfs_inobt_free_block,
Christoph Hellwig91cca5df2008-10-30 16:58:01 +1100305 .get_minrecs = xfs_inobt_get_minrecs,
Christoph Hellwigce5e42d2008-10-30 16:55:23 +1100306 .get_maxrecs = xfs_inobt_get_maxrecs,
Christoph Hellwigfe033cc2008-10-30 16:56:09 +1100307 .init_key_from_rec = xfs_inobt_init_key_from_rec,
Christoph Hellwig4b22a572008-10-30 16:57:40 +1100308 .init_rec_from_key = xfs_inobt_init_rec_from_key,
309 .init_rec_from_cur = xfs_inobt_init_rec_from_cur,
Christoph Hellwigfe033cc2008-10-30 16:56:09 +1100310 .init_ptr_from_cur = xfs_inobt_init_ptr_from_cur,
311 .key_diff = xfs_inobt_key_diff,
Dave Chinner1813dd62012-11-14 17:54:40 +1100312 .buf_ops = &xfs_inobt_buf_ops,
Dave Chinner742ae1e2013-04-30 21:39:34 +1000313#if defined(DEBUG) || defined(XFS_WARN)
Christoph Hellwig4a26e662008-10-30 16:58:32 +1100314 .keys_inorder = xfs_inobt_keys_inorder,
315 .recs_inorder = xfs_inobt_recs_inorder,
316#endif
Christoph Hellwig561f7d12008-10-30 16:53:59 +1100317};
318
319/*
320 * Allocate a new inode btree cursor.
321 */
322struct xfs_btree_cur * /* new inode btree cursor */
323xfs_inobt_init_cursor(
324 struct xfs_mount *mp, /* file system mount point */
325 struct xfs_trans *tp, /* transaction pointer */
326 struct xfs_buf *agbp, /* buffer for agi structure */
327 xfs_agnumber_t agno) /* allocation group number */
328{
329 struct xfs_agi *agi = XFS_BUF_TO_AGI(agbp);
330 struct xfs_btree_cur *cur;
331
332 cur = kmem_zone_zalloc(xfs_btree_cur_zone, KM_SLEEP);
333
334 cur->bc_tp = tp;
335 cur->bc_mp = mp;
336 cur->bc_nlevels = be32_to_cpu(agi->agi_level);
337 cur->bc_btnum = XFS_BTNUM_INO;
338 cur->bc_blocklog = mp->m_sb.sb_blocklog;
339
340 cur->bc_ops = &xfs_inobt_ops;
Christoph Hellwigee1a47a2013-04-21 14:53:46 -0500341 if (xfs_sb_version_hascrc(&mp->m_sb))
342 cur->bc_flags |= XFS_BTREE_CRC_BLOCKS;
Christoph Hellwig561f7d12008-10-30 16:53:59 +1100343
344 cur->bc_private.a.agbp = agbp;
345 cur->bc_private.a.agno = agno;
346
347 return cur;
348}
Christoph Hellwig60197e82008-10-30 17:11:19 +1100349
350/*
351 * Calculate number of records in an inobt btree block.
352 */
353int
354xfs_inobt_maxrecs(
355 struct xfs_mount *mp,
356 int blocklen,
357 int leaf)
358{
Christoph Hellwig7cc95a82008-10-30 17:14:34 +1100359 blocklen -= XFS_INOBT_BLOCK_LEN(mp);
Christoph Hellwig60197e82008-10-30 17:11:19 +1100360
361 if (leaf)
362 return blocklen / sizeof(xfs_inobt_rec_t);
363 return blocklen / (sizeof(xfs_inobt_key_t) + sizeof(xfs_inobt_ptr_t));
364}