kernel/fs/xfs/libxfs/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_shared.h"
  21 #include "xfs_format.h"
  22 #include "xfs_log_format.h"
  23 #include "xfs_trans_resv.h"
  24 #include "xfs_bit.h"
  25 #include "xfs_mount.h"
  26 #include "xfs_inode.h"
  27 #include "xfs_btree.h"
  28 #include "xfs_ialloc.h"
  29 #include "xfs_ialloc_btree.h"
  30 #include "xfs_alloc.h"
  31 #include "xfs_error.h"
  32 #include "xfs_trace.h"
  33 #include "xfs_cksum.h"
  34 #include "xfs_trans.h"
  35
  36
  37 STATIC int
  38 xfs_inobt_get_minrecs(
  39         struct xfs_btree_cur    *cur,
  40         int                     level)
  41 {
  42         return cur->bc_mp->m_inobt_mnr[level != 0];
  43 }
  44
  45 STATIC struct xfs_btree_cur *
  46 xfs_inobt_dup_cursor(
  47         struct xfs_btree_cur    *cur)
  48 {
  49         return xfs_inobt_init_cursor(cur->bc_mp, cur->bc_tp,
  50                         cur->bc_private.a.agbp, cur->bc_private.a.agno,
  51                         cur->bc_btnum);
  52 }
  53
  54 STATIC void
  55 xfs_inobt_set_root(
  56         struct xfs_btree_cur    *cur,
  57         union xfs_btree_ptr     *nptr,
  58         int                     inc)    /* level change */
  59 {
  60         struct xfs_buf          *agbp = cur->bc_private.a.agbp;
  61         struct xfs_agi          *agi = XFS_BUF_TO_AGI(agbp);
  62
  63         agi->agi_root = nptr->s;
  64         be32_add_cpu(&agi->agi_level, inc);
  65         xfs_ialloc_log_agi(cur->bc_tp, agbp, XFS_AGI_ROOT | XFS_AGI_LEVEL);
  66 }
  67
  68 STATIC void
  69 xfs_finobt_set_root(
  70         struct xfs_btree_cur    *cur,
  71         union xfs_btree_ptr     *nptr,
  72         int                     inc)    /* level change */
  73 {
  74         struct xfs_buf          *agbp = cur->bc_private.a.agbp;
  75         struct xfs_agi          *agi = XFS_BUF_TO_AGI(agbp);
  76
  77         agi->agi_free_root = nptr->s;
  78         be32_add_cpu(&agi->agi_free_level, inc);
  79         xfs_ialloc_log_agi(cur->bc_tp, agbp,
  80                            XFS_AGI_FREE_ROOT | XFS_AGI_FREE_LEVEL);
  81 }
  82
  83 STATIC int
  84 xfs_inobt_alloc_block(
  85         struct xfs_btree_cur    *cur,
  86         union xfs_btree_ptr     *start,
  87         union xfs_btree_ptr     *new,
  88         int                     *stat)
  89 {
  90         xfs_alloc_arg_t         args;           /* block allocation args */
  91         int                     error;          /* error return value */
  92         xfs_agblock_t           sbno = be32_to_cpu(start->s);
  93
  94         XFS_BTREE_TRACE_CURSOR(cur, XBT_ENTRY);
  95
  96         memset(&args, 0, sizeof(args));
  97         args.tp = cur->bc_tp;
  98         args.mp = cur->bc_mp;
  99         args.fsbno = XFS_AGB_TO_FSB(args.mp, cur->bc_private.a.agno, sbno);
 100         args.minlen = 1;
 101         args.maxlen = 1;
 102         args.prod = 1;
 103         args.type = XFS_ALLOCTYPE_NEAR_BNO;
 104
 105         error = xfs_alloc_vextent(&args);
 106         if (error) {
 107                 XFS_BTREE_TRACE_CURSOR(cur, XBT_ERROR);
 108                 return error;
 109         }
 110         if (args.fsbno == NULLFSBLOCK) {
 111                 XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT);
 112                 *stat = 0;
 113                 return 0;
 114         }
 115         ASSERT(args.len == 1);
 116         XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT);
 117
 118         new->s = cpu_to_be32(XFS_FSB_TO_AGBNO(args.mp, args.fsbno));
 119         *stat = 1;
 120         return 0;
 121 }
 122
 123 STATIC int
 124 xfs_inobt_free_block(
 125         struct xfs_btree_cur    *cur,
 126         struct xfs_buf          *bp)
 127 {
 128         xfs_fsblock_t           fsbno;
 129         int                     error;
 130
 131         fsbno = XFS_DADDR_TO_FSB(cur->bc_mp, XFS_BUF_ADDR(bp));
 132         error = xfs_free_extent(cur->bc_tp, fsbno, 1);
 133         if (error)
 134                 return error;
 135
 136         xfs_trans_binval(cur->bc_tp, bp);
 137         return error;
 138 }
 139
 140 STATIC int
 141 xfs_inobt_get_maxrecs(
 142         struct xfs_btree_cur    *cur,
 143         int                     level)
 144 {
 145         return cur->bc_mp->m_inobt_mxr[level != 0];
 146 }
 147
 148 STATIC void
 149 xfs_inobt_init_key_from_rec(
 150         union xfs_btree_key     *key,
 151         union xfs_btree_rec     *rec)
 152 {
 153         key->inobt.ir_startino = rec->inobt.ir_startino;
 154 }
 155
 156 STATIC void
 157 xfs_inobt_init_rec_from_key(
 158         union xfs_btree_key     *key,
 159         union xfs_btree_rec     *rec)
 160 {
 161         rec->inobt.ir_startino = key->inobt.ir_startino;
 162 }
 163
 164 STATIC void
 165 xfs_inobt_init_rec_from_cur(
 166         struct xfs_btree_cur    *cur,
 167         union xfs_btree_rec     *rec)
 168 {
 169         rec->inobt.ir_startino = cpu_to_be32(cur->bc_rec.i.ir_startino);
 170         rec->inobt.ir_freecount = cpu_to_be32(cur->bc_rec.i.ir_freecount);
 171         rec->inobt.ir_free = cpu_to_be64(cur->bc_rec.i.ir_free);
 172 }
 173
 174 /*
 175  * initial value of ptr for lookup
 176  */
 177 STATIC void
 178 xfs_inobt_init_ptr_from_cur(
 179         struct xfs_btree_cur    *cur,
 180         union xfs_btree_ptr     *ptr)
 181 {
 182         struct xfs_agi          *agi = XFS_BUF_TO_AGI(cur->bc_private.a.agbp);
 183
 184         ASSERT(cur->bc_private.a.agno == be32_to_cpu(agi->agi_seqno));
 185
 186         ptr->s = agi->agi_root;
 187 }
 188
 189 STATIC void
 190 xfs_finobt_init_ptr_from_cur(
 191         struct xfs_btree_cur    *cur,
 192         union xfs_btree_ptr     *ptr)
 193 {
 194         struct xfs_agi          *agi = XFS_BUF_TO_AGI(cur->bc_private.a.agbp);
 195
 196         ASSERT(cur->bc_private.a.agno == be32_to_cpu(agi->agi_seqno));
 197         ptr->s = agi->agi_free_root;
 198 }
 199
 200 STATIC __int64_t
 201 xfs_inobt_key_diff(
 202         struct xfs_btree_cur    *cur,
 203         union xfs_btree_key     *key)
 204 {
 205         return (__int64_t)be32_to_cpu(key->inobt.ir_startino) -
 206                           cur->bc_rec.i.ir_startino;
 207 }
 208
 209 static int
 210 xfs_inobt_verify(
 211         struct xfs_buf          *bp)
 212 {
 213         struct xfs_mount        *mp = bp->b_target->bt_mount;
 214         struct xfs_btree_block  *block = XFS_BUF_TO_BLOCK(bp);
 215         struct xfs_perag        *pag = bp->b_pag;
 216         unsigned int            level;
 217
 218         /*
 219          * During growfs operations, we can't verify the exact owner as the
 220          * perag is not fully initialised and hence not attached to the buffer.
 221          *
 222          * Similarly, during log recovery we will have a perag structure
 223          * attached, but the agi information will not yet have been initialised
 224          * from the on disk AGI. We don't currently use any of this information,
 225          * but beware of the landmine (i.e. need to check pag->pagi_init) if we
 226          * ever do.
 227          */
 228         switch (block->bb_magic) {
 229         case cpu_to_be32(XFS_IBT_CRC_MAGIC):
 230         case cpu_to_be32(XFS_FIBT_CRC_MAGIC):
 231                 if (!xfs_sb_version_hascrc(&mp->m_sb))
 232                         return false;
 233                 if (!uuid_equal(&block->bb_u.s.bb_uuid, &mp->m_sb.sb_uuid))
 234                         return false;
 235                 if (block->bb_u.s.bb_blkno != cpu_to_be64(bp->b_bn))
 236                         return false;
 237                 if (pag &&
 238                     be32_to_cpu(block->bb_u.s.bb_owner) != pag->pag_agno)
 239                         return false;
 240                 /* fall through */
 241         case cpu_to_be32(XFS_IBT_MAGIC):
 242         case cpu_to_be32(XFS_FIBT_MAGIC):
 243                 break;
 244         default:
 245                 return 0;
 246         }
 247
 248         /* numrecs and level verification */
 249         level = be16_to_cpu(block->bb_level);
 250         if (level >= mp->m_in_maxlevels)
 251                 return false;
 252         if (be16_to_cpu(block->bb_numrecs) > mp->m_inobt_mxr[level != 0])
 253                 return false;
 254
 255         /* sibling pointer verification */
 256         if (!block->bb_u.s.bb_leftsib ||
 257             (be32_to_cpu(block->bb_u.s.bb_leftsib) >= mp->m_sb.sb_agblocks &&
 258              block->bb_u.s.bb_leftsib != cpu_to_be32(NULLAGBLOCK)))
 259                 return false;
 260         if (!block->bb_u.s.bb_rightsib ||
 261             (be32_to_cpu(block->bb_u.s.bb_rightsib) >= mp->m_sb.sb_agblocks &&
 262              block->bb_u.s.bb_rightsib != cpu_to_be32(NULLAGBLOCK)))
 263                 return false;
 264
 265         return true;
 266 }
 267
 268 static void
 269 xfs_inobt_read_verify(
 270         struct xfs_buf  *bp)
 271 {
 272         if (!xfs_btree_sblock_verify_crc(bp))
 273                 xfs_buf_ioerror(bp, -EFSBADCRC);
 274         else if (!xfs_inobt_verify(bp))
 275                 xfs_buf_ioerror(bp, -EFSCORRUPTED);
 276
 277         if (bp->b_error) {
 278                 trace_xfs_btree_corrupt(bp, _RET_IP_);
 279                 xfs_verifier_error(bp);
 280         }
 281 }
 282
 283 static void
 284 xfs_inobt_write_verify(
 285         struct xfs_buf  *bp)
 286 {
 287         if (!xfs_inobt_verify(bp)) {
 288                 trace_xfs_btree_corrupt(bp, _RET_IP_);
 289                 xfs_buf_ioerror(bp, -EFSCORRUPTED);
 290                 xfs_verifier_error(bp);
 291                 return;
 292         }
 293         xfs_btree_sblock_calc_crc(bp);
 294
 295 }
 296
 297 const struct xfs_buf_ops xfs_inobt_buf_ops = {
 298         .verify_read = xfs_inobt_read_verify,
 299         .verify_write = xfs_inobt_write_verify,
 300 };
 301
 302 #if defined(DEBUG) || defined(XFS_WARN)
 303 STATIC int
 304 xfs_inobt_keys_inorder(
 305         struct xfs_btree_cur    *cur,
 306         union xfs_btree_key     *k1,
 307         union xfs_btree_key     *k2)
 308 {
 309         return be32_to_cpu(k1->inobt.ir_startino) <
 310                 be32_to_cpu(k2->inobt.ir_startino);
 311 }
 312
 313 STATIC int
 314 xfs_inobt_recs_inorder(
 315         struct xfs_btree_cur    *cur,
 316         union xfs_btree_rec     *r1,
 317         union xfs_btree_rec     *r2)
 318 {
 319         return be32_to_cpu(r1->inobt.ir_startino) + XFS_INODES_PER_CHUNK <=
 320                 be32_to_cpu(r2->inobt.ir_startino);
 321 }
 322 #endif  /* DEBUG */
 323
 324 static const struct xfs_btree_ops xfs_inobt_ops = {
 325         .rec_len                = sizeof(xfs_inobt_rec_t),
 326         .key_len                = sizeof(xfs_inobt_key_t),
 327
 328         .dup_cursor             = xfs_inobt_dup_cursor,
 329         .set_root               = xfs_inobt_set_root,
 330         .alloc_block            = xfs_inobt_alloc_block,
 331         .free_block             = xfs_inobt_free_block,
 332         .get_minrecs            = xfs_inobt_get_minrecs,
 333         .get_maxrecs            = xfs_inobt_get_maxrecs,
 334         .init_key_from_rec      = xfs_inobt_init_key_from_rec,
 335         .init_rec_from_key      = xfs_inobt_init_rec_from_key,
 336         .init_rec_from_cur      = xfs_inobt_init_rec_from_cur,
 337         .init_ptr_from_cur      = xfs_inobt_init_ptr_from_cur,
 338         .key_diff               = xfs_inobt_key_diff,
 339         .buf_ops                = &xfs_inobt_buf_ops,
 340 #if defined(DEBUG) || defined(XFS_WARN)
 341         .keys_inorder           = xfs_inobt_keys_inorder,
 342         .recs_inorder           = xfs_inobt_recs_inorder,
 343 #endif
 344 };
 345
 346 static const struct xfs_btree_ops xfs_finobt_ops = {
 347         .rec_len                = sizeof(xfs_inobt_rec_t),
 348         .key_len                = sizeof(xfs_inobt_key_t),
 349
 350         .dup_cursor             = xfs_inobt_dup_cursor,
 351         .set_root               = xfs_finobt_set_root,
 352         .alloc_block            = xfs_inobt_alloc_block,
 353         .free_block             = xfs_inobt_free_block,
 354         .get_minrecs            = xfs_inobt_get_minrecs,
 355         .get_maxrecs            = xfs_inobt_get_maxrecs,
 356         .init_key_from_rec      = xfs_inobt_init_key_from_rec,
 357         .init_rec_from_key      = xfs_inobt_init_rec_from_key,
 358         .init_rec_from_cur      = xfs_inobt_init_rec_from_cur,
 359         .init_ptr_from_cur      = xfs_finobt_init_ptr_from_cur,
 360         .key_diff               = xfs_inobt_key_diff,
 361         .buf_ops                = &xfs_inobt_buf_ops,
 362 #if defined(DEBUG) || defined(XFS_WARN)
 363         .keys_inorder           = xfs_inobt_keys_inorder,
 364         .recs_inorder           = xfs_inobt_recs_inorder,
 365 #endif
 366 };
 367
 368 /*
 369  * Allocate a new inode btree cursor.
 370  */
 371 struct xfs_btree_cur *                          /* new inode btree cursor */
 372 xfs_inobt_init_cursor(
 373         struct xfs_mount        *mp,            /* file system mount point */
 374         struct xfs_trans        *tp,            /* transaction pointer */
 375         struct xfs_buf          *agbp,          /* buffer for agi structure */
 376         xfs_agnumber_t          agno,           /* allocation group number */
 377         xfs_btnum_t             btnum)          /* ialloc or free ino btree */
 378 {
 379         struct xfs_agi          *agi = XFS_BUF_TO_AGI(agbp);
 380         struct xfs_btree_cur    *cur;
 381
 382         cur = kmem_zone_zalloc(xfs_btree_cur_zone, KM_SLEEP);
 383
 384         cur->bc_tp = tp;
 385         cur->bc_mp = mp;
 386         cur->bc_btnum = btnum;
 387         if (btnum == XFS_BTNUM_INO) {
 388                 cur->bc_nlevels = be32_to_cpu(agi->agi_level);
 389                 cur->bc_ops = &xfs_inobt_ops;
 390         } else {
 391                 cur->bc_nlevels = be32_to_cpu(agi->agi_free_level);
 392                 cur->bc_ops = &xfs_finobt_ops;
 393         }
 394
 395         cur->bc_blocklog = mp->m_sb.sb_blocklog;
 396
 397         if (xfs_sb_version_hascrc(&mp->m_sb))
 398                 cur->bc_flags |= XFS_BTREE_CRC_BLOCKS;
 399
 400         cur->bc_private.a.agbp = agbp;
 401         cur->bc_private.a.agno = agno;
 402
 403         return cur;
 404 }
 405
 406 /*
 407  * Calculate number of records in an inobt btree block.
 408  */
 409 int
 410 xfs_inobt_maxrecs(
 411         struct xfs_mount        *mp,
 412         int                     blocklen,
 413         int                     leaf)
 414 {
 415         blocklen -= XFS_INOBT_BLOCK_LEN(mp);
 416
 417         if (leaf)
 418                 return blocklen / sizeof(xfs_inobt_rec_t);
 419         return blocklen / (sizeof(xfs_inobt_key_t) + sizeof(xfs_inobt_ptr_t));
 420 }