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