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_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_sb.h"
  26 #include "xfs_ag.h"
  27 #include "xfs_mount.h"
  28 #include "xfs_inode.h"
  29 #include "xfs_btree.h"
  30 #include "xfs_ialloc.h"
  31 #include "xfs_ialloc_btree.h"
  32 #include "xfs_alloc.h"
  33 #include "xfs_error.h"
  34 #include "xfs_trace.h"
  35 #include "xfs_cksum.h"
  36 #include "xfs_trans.h"
  37
  38
  39 STATIC int
  40 xfs_inobt_get_minrecs(
  41         struct xfs_btree_cur    *cur,
  42         int                     level)
  43 {
  44         return cur->bc_mp->m_inobt_mnr[level != 0];
  45 }
  46
  47 STATIC struct xfs_btree_cur *
  48 xfs_inobt_dup_cursor(
  49         struct xfs_btree_cur    *cur)
  50 {
  51         return xfs_inobt_init_cursor(cur->bc_mp, cur->bc_tp,
  52                         cur->bc_private.a.agbp, cur->bc_private.a.agno,
  53                         cur->bc_btnum);
  54 }
  55
  56 STATIC void
  57 xfs_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
  70 STATIC void
  71 xfs_finobt_set_root(
  72         struct xfs_btree_cur    *cur,
  73         union xfs_btree_ptr     *nptr,
  74         int                     inc)    /* level change */
  75 {
  76         struct xfs_buf          *agbp = cur->bc_private.a.agbp;
  77         struct xfs_agi          *agi = XFS_BUF_TO_AGI(agbp);
  78
  79         agi->agi_free_root = nptr->s;
  80         be32_add_cpu(&agi->agi_free_level, inc);
  81         xfs_ialloc_log_agi(cur->bc_tp, agbp,
  82                            XFS_AGI_FREE_ROOT | XFS_AGI_FREE_LEVEL);
  83 }
  84
  85 STATIC int
  86 xfs_inobt_alloc_block(
  87         struct xfs_btree_cur    *cur,
  88         union xfs_btree_ptr     *start,
  89         union xfs_btree_ptr     *new,
  90         int                     *stat)
  91 {
  92         xfs_alloc_arg_t         args;           /* block allocation args */
  93         int                     error;          /* error return value */
  94         xfs_agblock_t           sbno = be32_to_cpu(start->s);
  95
  96         XFS_BTREE_TRACE_CURSOR(cur, XBT_ENTRY);
  97
  98         memset(&args, 0, sizeof(args));
  99         args.tp = cur->bc_tp;
 100         args.mp = cur->bc_mp;
 101         args.fsbno = XFS_AGB_TO_FSB(args.mp, cur->bc_private.a.agno, sbno);
 102         args.minlen = 1;
 103         args.maxlen = 1;
 104         args.prod = 1;
 105         args.type = XFS_ALLOCTYPE_NEAR_BNO;
 106
 107         error = xfs_alloc_vextent(&args);
 108         if (error) {
 109                 XFS_BTREE_TRACE_CURSOR(cur, XBT_ERROR);
 110                 return error;
 111         }
 112         if (args.fsbno == NULLFSBLOCK) {
 113                 XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT);
 114                 *stat = 0;
 115                 return 0;
 116         }
 117         ASSERT(args.len == 1);
 118         XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT);
 119
 120         new->s = cpu_to_be32(XFS_FSB_TO_AGBNO(args.mp, args.fsbno));
 121         *stat = 1;
 122         return 0;
 123 }
 124
 125 STATIC int
 126 xfs_inobt_free_block(
 127         struct xfs_btree_cur    *cur,
 128         struct xfs_buf          *bp)
 129 {
 130         xfs_fsblock_t           fsbno;
 131         int                     error;
 132
 133         fsbno = XFS_DADDR_TO_FSB(cur->bc_mp, XFS_BUF_ADDR(bp));
 134         error = xfs_free_extent(cur->bc_tp, fsbno, 1);
 135         if (error)
 136                 return error;
 137
 138         xfs_trans_binval(cur->bc_tp, bp);
 139         return error;
 140 }
 141
 142 STATIC int
 143 xfs_inobt_get_maxrecs(
 144         struct xfs_btree_cur    *cur,
 145         int                     level)
 146 {
 147         return cur->bc_mp->m_inobt_mxr[level != 0];
 148 }
 149
 150 STATIC void
 151 xfs_inobt_init_key_from_rec(
 152         union xfs_btree_key     *key,
 153         union xfs_btree_rec     *rec)
 154 {
 155         key->inobt.ir_startino = rec->inobt.ir_startino;
 156 }
 157
 158 STATIC void
 159 xfs_inobt_init_rec_from_key(
 160         union xfs_btree_key     *key,
 161         union xfs_btree_rec     *rec)
 162 {
 163         rec->inobt.ir_startino = key->inobt.ir_startino;
 164 }
 165
 166 STATIC void
 167 xfs_inobt_init_rec_from_cur(
 168         struct xfs_btree_cur    *cur,
 169         union xfs_btree_rec     *rec)
 170 {
 171         rec->inobt.ir_startino = cpu_to_be32(cur->bc_rec.i.ir_startino);
 172         rec->inobt.ir_freecount = cpu_to_be32(cur->bc_rec.i.ir_freecount);
 173         rec->inobt.ir_free = cpu_to_be64(cur->bc_rec.i.ir_free);
 174 }
 175
 176 /*
 177  * initial value of ptr for lookup
 178  */
 179 STATIC void
 180 xfs_inobt_init_ptr_from_cur(
 181         struct xfs_btree_cur    *cur,
 182         union xfs_btree_ptr     *ptr)
 183 {
 184         struct xfs_agi          *agi = XFS_BUF_TO_AGI(cur->bc_private.a.agbp);
 185
 186         ASSERT(cur->bc_private.a.agno == be32_to_cpu(agi->agi_seqno));
 187
 188         ptr->s = agi->agi_root;
 189 }
 190
 191 STATIC void
 192 xfs_finobt_init_ptr_from_cur(
 193         struct xfs_btree_cur    *cur,
 194         union xfs_btree_ptr     *ptr)
 195 {
 196         struct xfs_agi          *agi = XFS_BUF_TO_AGI(cur->bc_private.a.agbp);
 197
 198         ASSERT(cur->bc_private.a.agno == be32_to_cpu(agi->agi_seqno));
 199         ptr->s = agi->agi_free_root;
 200 }
 201
 202 STATIC __int64_t
 203 xfs_inobt_key_diff(
 204         struct xfs_btree_cur    *cur,
 205         union xfs_btree_key     *key)
 206 {
 207         return (__int64_t)be32_to_cpu(key->inobt.ir_startino) -
 208                           cur->bc_rec.i.ir_startino;
 209 }
 210
 211 static int
 212 xfs_inobt_verify(
 213         struct xfs_buf          *bp)
 214 {
 215         struct xfs_mount        *mp = bp->b_target->bt_mount;
 216         struct xfs_btree_block  *block = XFS_BUF_TO_BLOCK(bp);
 217         struct xfs_perag        *pag = bp->b_pag;
 218         unsigned int            level;
 219
 220         /*
 221          * During growfs operations, we can't verify the exact owner as the
 222          * perag is not fully initialised and hence not attached to the buffer.
 223          *
 224          * Similarly, during log recovery we will have a perag structure
 225          * attached, but the agi information will not yet have been initialised
 226          * from the on disk AGI. We don't currently use any of this information,
 227          * but beware of the landmine (i.e. need to check pag->pagi_init) if we
 228          * ever do.
 229          */
 230         switch (block->bb_magic) {
 231         case cpu_to_be32(XFS_IBT_CRC_MAGIC):
 232         case cpu_to_be32(XFS_FIBT_CRC_MAGIC):
 233                 if (!xfs_sb_version_hascrc(&mp->m_sb))
 234                         return false;
 235                 if (!uuid_equal(&block->bb_u.s.bb_uuid, &mp->m_sb.sb_uuid))
 236                         return false;
 237                 if (block->bb_u.s.bb_blkno != cpu_to_be64(bp->b_bn))
 238                         return false;
 239                 if (pag &&
 240                     be32_to_cpu(block->bb_u.s.bb_owner) != pag->pag_agno)
 241                         return false;
 242                 /* fall through */
 243         case cpu_to_be32(XFS_IBT_MAGIC):
 244         case cpu_to_be32(XFS_FIBT_MAGIC):
 245                 break;
 246         default:
 247                 return 0;
 248         }
 249
 250         /* numrecs and level verification */
 251         level = be16_to_cpu(block->bb_level);
 252         if (level >= mp->m_in_maxlevels)
 253                 return false;
 254         if (be16_to_cpu(block->bb_numrecs) > mp->m_inobt_mxr[level != 0])
 255                 return false;
 256
 257         /* sibling pointer verification */
 258         if (!block->bb_u.s.bb_leftsib ||
 259             (be32_to_cpu(block->bb_u.s.bb_leftsib) >= mp->m_sb.sb_agblocks &&
 260              block->bb_u.s.bb_leftsib != cpu_to_be32(NULLAGBLOCK)))
 261                 return false;
 262         if (!block->bb_u.s.bb_rightsib ||
 263             (be32_to_cpu(block->bb_u.s.bb_rightsib) >= mp->m_sb.sb_agblocks &&
 264              block->bb_u.s.bb_rightsib != cpu_to_be32(NULLAGBLOCK)))
 265                 return false;
 266
 267         return true;
 268 }
 269
 270 static void
 271 xfs_inobt_read_verify(
 272         struct xfs_buf  *bp)
 273 {
 274         if (!xfs_btree_sblock_verify_crc(bp))
 275                 xfs_buf_ioerror(bp, EFSBADCRC);
 276         else if (!xfs_inobt_verify(bp))
 277                 xfs_buf_ioerror(bp, EFSCORRUPTED);
 278
 279         if (bp->b_error) {
 280                 trace_xfs_btree_corrupt(bp, _RET_IP_);
 281                 xfs_verifier_error(bp);
 282         }
 283 }
 284
 285 static void
 286 xfs_inobt_write_verify(
 287         struct xfs_buf  *bp)
 288 {
 289         if (!xfs_inobt_verify(bp)) {
 290                 trace_xfs_btree_corrupt(bp, _RET_IP_);
 291                 xfs_buf_ioerror(bp, EFSCORRUPTED);
 292                 xfs_verifier_error(bp);
 293                 return;
 294         }
 295         xfs_btree_sblock_calc_crc(bp);
 296
 297 }
 298
 299 const struct xfs_buf_ops xfs_inobt_buf_ops = {
 300         .verify_read = xfs_inobt_read_verify,
 301         .verify_write = xfs_inobt_write_verify,
 302 };
 303
 304 #if defined(DEBUG) || defined(XFS_WARN)
 305 STATIC int
 306 xfs_inobt_keys_inorder(
 307         struct xfs_btree_cur    *cur,
 308         union xfs_btree_key     *k1,
 309         union xfs_btree_key     *k2)
 310 {
 311         return be32_to_cpu(k1->inobt.ir_startino) <
 312                 be32_to_cpu(k2->inobt.ir_startino);
 313 }
 314
 315 STATIC int
 316 xfs_inobt_recs_inorder(
 317         struct xfs_btree_cur    *cur,
 318         union xfs_btree_rec     *r1,
 319         union xfs_btree_rec     *r2)
 320 {
 321         return be32_to_cpu(r1->inobt.ir_startino) + XFS_INODES_PER_CHUNK <=
 322                 be32_to_cpu(r2->inobt.ir_startino);
 323 }
 324 #endif  /* DEBUG */
 325
 326 static const struct xfs_btree_ops xfs_inobt_ops = {
 327         .rec_len                = sizeof(xfs_inobt_rec_t),
 328         .key_len                = sizeof(xfs_inobt_key_t),
 329
 330         .dup_cursor             = xfs_inobt_dup_cursor,
 331         .set_root               = xfs_inobt_set_root,
 332         .alloc_block            = xfs_inobt_alloc_block,
 333         .free_block             = xfs_inobt_free_block,
 334         .get_minrecs            = xfs_inobt_get_minrecs,
 335         .get_maxrecs            = xfs_inobt_get_maxrecs,
 336         .init_key_from_rec      = xfs_inobt_init_key_from_rec,
 337         .init_rec_from_key      = xfs_inobt_init_rec_from_key,
 338         .init_rec_from_cur      = xfs_inobt_init_rec_from_cur,
 339         .init_ptr_from_cur      = xfs_inobt_init_ptr_from_cur,
 340         .key_diff               = xfs_inobt_key_diff,
 341         .buf_ops                = &xfs_inobt_buf_ops,
 342 #if defined(DEBUG) || defined(XFS_WARN)
 343         .keys_inorder           = xfs_inobt_keys_inorder,
 344         .recs_inorder           = xfs_inobt_recs_inorder,
 345 #endif
 346 };
 347
 348 static const struct xfs_btree_ops xfs_finobt_ops = {
 349         .rec_len                = sizeof(xfs_inobt_rec_t),
 350         .key_len                = sizeof(xfs_inobt_key_t),
 351
 352         .dup_cursor             = xfs_inobt_dup_cursor,
 353         .set_root               = xfs_finobt_set_root,
 354         .alloc_block            = xfs_inobt_alloc_block,
 355         .free_block             = xfs_inobt_free_block,
 356         .get_minrecs            = xfs_inobt_get_minrecs,
 357         .get_maxrecs            = xfs_inobt_get_maxrecs,
 358         .init_key_from_rec      = xfs_inobt_init_key_from_rec,
 359         .init_rec_from_key      = xfs_inobt_init_rec_from_key,
 360         .init_rec_from_cur      = xfs_inobt_init_rec_from_cur,
 361         .init_ptr_from_cur      = xfs_finobt_init_ptr_from_cur,
 362         .key_diff               = xfs_inobt_key_diff,
 363         .buf_ops                = &xfs_inobt_buf_ops,
 364 #if defined(DEBUG) || defined(XFS_WARN)
 365         .keys_inorder           = xfs_inobt_keys_inorder,
 366         .recs_inorder           = xfs_inobt_recs_inorder,
 367 #endif
 368 };
 369
 370 /*
 371  * Allocate a new inode btree cursor.
 372  */
 373 struct xfs_btree_cur *                          /* new inode btree cursor */
 374 xfs_inobt_init_cursor(
 375         struct xfs_mount        *mp,            /* file system mount point */
 376         struct xfs_trans        *tp,            /* transaction pointer */
 377         struct xfs_buf          *agbp,          /* buffer for agi structure */
 378         xfs_agnumber_t          agno,           /* allocation group number */
 379         xfs_btnum_t             btnum)          /* ialloc or free ino btree */
 380 {
 381         struct xfs_agi          *agi = XFS_BUF_TO_AGI(agbp);
 382         struct xfs_btree_cur    *cur;
 383
 384         cur = kmem_zone_zalloc(xfs_btree_cur_zone, KM_SLEEP);
 385
 386         cur->bc_tp = tp;
 387         cur->bc_mp = mp;
 388         cur->bc_btnum = btnum;
 389         if (btnum == XFS_BTNUM_INO) {
 390                 cur->bc_nlevels = be32_to_cpu(agi->agi_level);
 391                 cur->bc_ops = &xfs_inobt_ops;
 392         } else {
 393                 cur->bc_nlevels = be32_to_cpu(agi->agi_free_level);
 394                 cur->bc_ops = &xfs_finobt_ops;
 395         }
 396
 397         cur->bc_blocklog = mp->m_sb.sb_blocklog;
 398
 399         if (xfs_sb_version_hascrc(&mp->m_sb))
 400                 cur->bc_flags |= XFS_BTREE_CRC_BLOCKS;
 401
 402         cur->bc_private.a.agbp = agbp;
 403         cur->bc_private.a.agno = agno;
 404
 405         return cur;
 406 }
 407
 408 /*
 409  * Calculate number of records in an inobt btree block.
 410  */
 411 int
 412 xfs_inobt_maxrecs(
 413         struct xfs_mount        *mp,
 414         int                     blocklen,
 415         int                     leaf)
 416 {
 417         blocklen -= XFS_INOBT_BLOCK_LEN(mp);
 418
 419         if (leaf)
 420                 return blocklen / sizeof(xfs_inobt_rec_t);
 421         return blocklen / (sizeof(xfs_inobt_key_t) + sizeof(xfs_inobt_ptr_t));
 422 }