fs/xfs/xfs_fsops.c

   1 /*
   2  * Copyright (c) 2000-2005 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_sb.h"
  25 #include "xfs_mount.h"
  26 #include "xfs_defer.h"
  27 #include "xfs_da_format.h"
  28 #include "xfs_da_btree.h"
  29 #include "xfs_inode.h"
  30 #include "xfs_trans.h"
  31 #include "xfs_inode_item.h"
  32 #include "xfs_error.h"
  33 #include "xfs_btree.h"
  34 #include "xfs_alloc_btree.h"
  35 #include "xfs_alloc.h"
  36 #include "xfs_ialloc.h"
  37 #include "xfs_fsops.h"
  38 #include "xfs_itable.h"
  39 #include "xfs_trans_space.h"
  40 #include "xfs_rtalloc.h"
  41 #include "xfs_trace.h"
  42 #include "xfs_log.h"
  43 #include "xfs_filestream.h"
  44
  45 /*
  46  * File system operations
  47  */
  48
  49 int
  50 xfs_fs_geometry(
  51         xfs_mount_t             *mp,
  52         xfs_fsop_geom_t         *geo,
  53         int                     new_version)
  54 {
  55
  56         memset(geo, 0, sizeof(*geo));
  57
  58         geo->blocksize = mp->m_sb.sb_blocksize;
  59         geo->rtextsize = mp->m_sb.sb_rextsize;
  60         geo->agblocks = mp->m_sb.sb_agblocks;
  61         geo->agcount = mp->m_sb.sb_agcount;
  62         geo->logblocks = mp->m_sb.sb_logblocks;
  63         geo->sectsize = mp->m_sb.sb_sectsize;
  64         geo->inodesize = mp->m_sb.sb_inodesize;
  65         geo->imaxpct = mp->m_sb.sb_imax_pct;
  66         geo->datablocks = mp->m_sb.sb_dblocks;
  67         geo->rtblocks = mp->m_sb.sb_rblocks;
  68         geo->rtextents = mp->m_sb.sb_rextents;
  69         geo->logstart = mp->m_sb.sb_logstart;
  70         ASSERT(sizeof(geo->uuid)==sizeof(mp->m_sb.sb_uuid));
  71         memcpy(geo->uuid, &mp->m_sb.sb_uuid, sizeof(mp->m_sb.sb_uuid));
  72         if (new_version >= 2) {
  73                 geo->sunit = mp->m_sb.sb_unit;
  74                 geo->swidth = mp->m_sb.sb_width;
  75         }
  76         if (new_version >= 3) {
  77                 geo->version = XFS_FSOP_GEOM_VERSION;
  78                 geo->flags = XFS_FSOP_GEOM_FLAGS_NLINK |
  79                              XFS_FSOP_GEOM_FLAGS_DIRV2 |
  80                         (xfs_sb_version_hasattr(&mp->m_sb) ?
  81                                 XFS_FSOP_GEOM_FLAGS_ATTR : 0) |
  82                         (xfs_sb_version_hasquota(&mp->m_sb) ?
  83                                 XFS_FSOP_GEOM_FLAGS_QUOTA : 0) |
  84                         (xfs_sb_version_hasalign(&mp->m_sb) ?
  85                                 XFS_FSOP_GEOM_FLAGS_IALIGN : 0) |
  86                         (xfs_sb_version_hasdalign(&mp->m_sb) ?
  87                                 XFS_FSOP_GEOM_FLAGS_DALIGN : 0) |
  88                         (xfs_sb_version_hasextflgbit(&mp->m_sb) ?
  89                                 XFS_FSOP_GEOM_FLAGS_EXTFLG : 0) |
  90                         (xfs_sb_version_hassector(&mp->m_sb) ?
  91                                 XFS_FSOP_GEOM_FLAGS_SECTOR : 0) |
  92                         (xfs_sb_version_hasasciici(&mp->m_sb) ?
  93                                 XFS_FSOP_GEOM_FLAGS_DIRV2CI : 0) |
  94                         (xfs_sb_version_haslazysbcount(&mp->m_sb) ?
  95                                 XFS_FSOP_GEOM_FLAGS_LAZYSB : 0) |
  96                         (xfs_sb_version_hasattr2(&mp->m_sb) ?
  97                                 XFS_FSOP_GEOM_FLAGS_ATTR2 : 0) |
  98                         (xfs_sb_version_hasprojid32bit(&mp->m_sb) ?
  99                                 XFS_FSOP_GEOM_FLAGS_PROJID32 : 0) |
 100                         (xfs_sb_version_hascrc(&mp->m_sb) ?
 101                                 XFS_FSOP_GEOM_FLAGS_V5SB : 0) |
 102                         (xfs_sb_version_hasftype(&mp->m_sb) ?
 103                                 XFS_FSOP_GEOM_FLAGS_FTYPE : 0) |
 104                         (xfs_sb_version_hasfinobt(&mp->m_sb) ?
 105                                 XFS_FSOP_GEOM_FLAGS_FINOBT : 0) |
 106                         (xfs_sb_version_hassparseinodes(&mp->m_sb) ?
 107                                 XFS_FSOP_GEOM_FLAGS_SPINODES : 0);
 108                 geo->logsectsize = xfs_sb_version_hassector(&mp->m_sb) ?
 109                                 mp->m_sb.sb_logsectsize : BBSIZE;
 110                 geo->rtsectsize = mp->m_sb.sb_blocksize;
 111                 geo->dirblocksize = mp->m_dir_geo->blksize;
 112         }
 113         if (new_version >= 4) {
 114                 geo->flags |=
 115                         (xfs_sb_version_haslogv2(&mp->m_sb) ?
 116                                 XFS_FSOP_GEOM_FLAGS_LOGV2 : 0);
 117                 geo->logsunit = mp->m_sb.sb_logsunit;
 118         }
 119         return 0;
 120 }
 121
 122 static struct xfs_buf *
 123 xfs_growfs_get_hdr_buf(
 124         struct xfs_mount        *mp,
 125         xfs_daddr_t             blkno,
 126         size_t                  numblks,
 127         int                     flags,
 128         const struct xfs_buf_ops *ops)
 129 {
 130         struct xfs_buf          *bp;
 131
 132         bp = xfs_buf_get_uncached(mp->m_ddev_targp, numblks, flags);
 133         if (!bp)
 134                 return NULL;
 135
 136         xfs_buf_zero(bp, 0, BBTOB(bp->b_length));
 137         bp->b_bn = blkno;
 138         bp->b_maps[0].bm_bn = blkno;
 139         bp->b_ops = ops;
 140
 141         return bp;
 142 }
 143
 144 static int
 145 xfs_growfs_data_private(
 146         xfs_mount_t             *mp,            /* mount point for filesystem */
 147         xfs_growfs_data_t       *in)            /* growfs data input struct */
 148 {
 149         xfs_agf_t               *agf;
 150         struct xfs_agfl         *agfl;
 151         xfs_agi_t               *agi;
 152         xfs_agnumber_t          agno;
 153         xfs_extlen_t            agsize;
 154         xfs_extlen_t            tmpsize;
 155         xfs_alloc_rec_t         *arec;
 156         xfs_buf_t               *bp;
 157         int                     bucket;
 158         int                     dpct;
 159         int                     error, saved_error = 0;
 160         xfs_agnumber_t          nagcount;
 161         xfs_agnumber_t          nagimax = 0;
 162         xfs_rfsblock_t          nb, nb_mod;
 163         xfs_rfsblock_t          new;
 164         xfs_rfsblock_t          nfree;
 165         xfs_agnumber_t          oagcount;
 166         int                     pct;
 167         xfs_trans_t             *tp;
 168
 169         nb = in->newblocks;
 170         pct = in->imaxpct;
 171         if (nb < mp->m_sb.sb_dblocks || pct < 0 || pct > 100)
 172                 return -EINVAL;
 173         if ((error = xfs_sb_validate_fsb_count(&mp->m_sb, nb)))
 174                 return error;
 175         dpct = pct - mp->m_sb.sb_imax_pct;
 176         error = xfs_buf_read_uncached(mp->m_ddev_targp,
 177                                 XFS_FSB_TO_BB(mp, nb) - XFS_FSS_TO_BB(mp, 1),
 178                                 XFS_FSS_TO_BB(mp, 1), 0, &bp, NULL);
 179         if (error)
 180                 return error;
 181         xfs_buf_relse(bp);
 182
 183         new = nb;       /* use new as a temporary here */
 184         nb_mod = do_div(new, mp->m_sb.sb_agblocks);
 185         nagcount = new + (nb_mod != 0);
 186         if (nb_mod && nb_mod < XFS_MIN_AG_BLOCKS) {
 187                 nagcount--;
 188                 nb = (xfs_rfsblock_t)nagcount * mp->m_sb.sb_agblocks;
 189                 if (nb < mp->m_sb.sb_dblocks)
 190                         return -EINVAL;
 191         }
 192         new = nb - mp->m_sb.sb_dblocks;
 193         oagcount = mp->m_sb.sb_agcount;
 194
 195         /* allocate the new per-ag structures */
 196         if (nagcount > oagcount) {
 197                 error = xfs_initialize_perag(mp, nagcount, &nagimax);
 198                 if (error)
 199                         return error;
 200         }
 201
 202         error = xfs_trans_alloc(mp, &M_RES(mp)->tr_growdata,
 203                         XFS_GROWFS_SPACE_RES(mp), 0, XFS_TRANS_RESERVE, &tp);
 204         if (error)
 205                 return error;
 206
 207         /*
 208          * Write new AG headers to disk. Non-transactional, but written
 209          * synchronously so they are completed prior to the growfs transaction
 210          * being logged.
 211          */
 212         nfree = 0;
 213         for (agno = nagcount - 1; agno >= oagcount; agno--, new -= agsize) {
 214                 __be32  *agfl_bno;
 215
 216                 /*
 217                  * AG freespace header block
 218                  */
 219                 bp = xfs_growfs_get_hdr_buf(mp,
 220                                 XFS_AG_DADDR(mp, agno, XFS_AGF_DADDR(mp)),
 221                                 XFS_FSS_TO_BB(mp, 1), 0,
 222                                 &xfs_agf_buf_ops);
 223                 if (!bp) {
 224                         error = -ENOMEM;
 225                         goto error0;
 226                 }
 227
 228                 agf = XFS_BUF_TO_AGF(bp);
 229                 agf->agf_magicnum = cpu_to_be32(XFS_AGF_MAGIC);
 230                 agf->agf_versionnum = cpu_to_be32(XFS_AGF_VERSION);
 231                 agf->agf_seqno = cpu_to_be32(agno);
 232                 if (agno == nagcount - 1)
 233                         agsize =
 234                                 nb -
 235                                 (agno * (xfs_rfsblock_t)mp->m_sb.sb_agblocks);
 236                 else
 237                         agsize = mp->m_sb.sb_agblocks;
 238                 agf->agf_length = cpu_to_be32(agsize);
 239                 agf->agf_roots[XFS_BTNUM_BNOi] = cpu_to_be32(XFS_BNO_BLOCK(mp));
 240                 agf->agf_roots[XFS_BTNUM_CNTi] = cpu_to_be32(XFS_CNT_BLOCK(mp));
 241                 agf->agf_levels[XFS_BTNUM_BNOi] = cpu_to_be32(1);
 242                 agf->agf_levels[XFS_BTNUM_CNTi] = cpu_to_be32(1);
 243                 agf->agf_flfirst = cpu_to_be32(1);
 244                 agf->agf_fllast = 0;
 245                 agf->agf_flcount = 0;
 246                 tmpsize = agsize - mp->m_ag_prealloc_blocks;
 247                 agf->agf_freeblks = cpu_to_be32(tmpsize);
 248                 agf->agf_longest = cpu_to_be32(tmpsize);
 249                 if (xfs_sb_version_hascrc(&mp->m_sb))
 250                         uuid_copy(&agf->agf_uuid, &mp->m_sb.sb_meta_uuid);
 251
 252                 error = xfs_bwrite(bp);
 253                 xfs_buf_relse(bp);
 254                 if (error)
 255                         goto error0;
 256
 257                 /*
 258                  * AG freelist header block
 259                  */
 260                 bp = xfs_growfs_get_hdr_buf(mp,
 261                                 XFS_AG_DADDR(mp, agno, XFS_AGFL_DADDR(mp)),
 262                                 XFS_FSS_TO_BB(mp, 1), 0,
 263                                 &xfs_agfl_buf_ops);
 264                 if (!bp) {
 265                         error = -ENOMEM;
 266                         goto error0;
 267                 }
 268
 269                 agfl = XFS_BUF_TO_AGFL(bp);
 270                 if (xfs_sb_version_hascrc(&mp->m_sb)) {
 271                         agfl->agfl_magicnum = cpu_to_be32(XFS_AGFL_MAGIC);
 272                         agfl->agfl_seqno = cpu_to_be32(agno);
 273                         uuid_copy(&agfl->agfl_uuid, &mp->m_sb.sb_meta_uuid);
 274                 }
 275
 276                 agfl_bno = XFS_BUF_TO_AGFL_BNO(mp, bp);
 277                 for (bucket = 0; bucket < XFS_AGFL_SIZE(mp); bucket++)
 278                         agfl_bno[bucket] = cpu_to_be32(NULLAGBLOCK);
 279
 280                 error = xfs_bwrite(bp);
 281                 xfs_buf_relse(bp);
 282                 if (error)
 283                         goto error0;
 284
 285                 /*
 286                  * AG inode header block
 287                  */
 288                 bp = xfs_growfs_get_hdr_buf(mp,
 289                                 XFS_AG_DADDR(mp, agno, XFS_AGI_DADDR(mp)),
 290                                 XFS_FSS_TO_BB(mp, 1), 0,
 291                                 &xfs_agi_buf_ops);
 292                 if (!bp) {
 293                         error = -ENOMEM;
 294                         goto error0;
 295                 }
 296
 297                 agi = XFS_BUF_TO_AGI(bp);
 298                 agi->agi_magicnum = cpu_to_be32(XFS_AGI_MAGIC);
 299                 agi->agi_versionnum = cpu_to_be32(XFS_AGI_VERSION);
 300                 agi->agi_seqno = cpu_to_be32(agno);
 301                 agi->agi_length = cpu_to_be32(agsize);
 302                 agi->agi_count = 0;
 303                 agi->agi_root = cpu_to_be32(XFS_IBT_BLOCK(mp));
 304                 agi->agi_level = cpu_to_be32(1);
 305                 agi->agi_freecount = 0;
 306                 agi->agi_newino = cpu_to_be32(NULLAGINO);
 307                 agi->agi_dirino = cpu_to_be32(NULLAGINO);
 308                 if (xfs_sb_version_hascrc(&mp->m_sb))
 309                         uuid_copy(&agi->agi_uuid, &mp->m_sb.sb_meta_uuid);
 310                 if (xfs_sb_version_hasfinobt(&mp->m_sb)) {
 311                         agi->agi_free_root = cpu_to_be32(XFS_FIBT_BLOCK(mp));
 312                         agi->agi_free_level = cpu_to_be32(1);
 313                 }
 314                 for (bucket = 0; bucket < XFS_AGI_UNLINKED_BUCKETS; bucket++)
 315                         agi->agi_unlinked[bucket] = cpu_to_be32(NULLAGINO);
 316
 317                 error = xfs_bwrite(bp);
 318                 xfs_buf_relse(bp);
 319                 if (error)
 320                         goto error0;
 321
 322                 /*
 323                  * BNO btree root block
 324                  */
 325                 bp = xfs_growfs_get_hdr_buf(mp,
 326                                 XFS_AGB_TO_DADDR(mp, agno, XFS_BNO_BLOCK(mp)),
 327                                 BTOBB(mp->m_sb.sb_blocksize), 0,
 328                                 &xfs_allocbt_buf_ops);
 329
 330                 if (!bp) {
 331                         error = -ENOMEM;
 332                         goto error0;
 333                 }
 334
 335                 if (xfs_sb_version_hascrc(&mp->m_sb))
 336                         xfs_btree_init_block(mp, bp, XFS_ABTB_CRC_MAGIC, 0, 1,
 337                                                 agno, XFS_BTREE_CRC_BLOCKS);
 338                 else
 339                         xfs_btree_init_block(mp, bp, XFS_ABTB_MAGIC, 0, 1,
 340                                                 agno, 0);
 341
 342                 arec = XFS_ALLOC_REC_ADDR(mp, XFS_BUF_TO_BLOCK(bp), 1);
 343                 arec->ar_startblock = cpu_to_be32(mp->m_ag_prealloc_blocks);
 344                 arec->ar_blockcount = cpu_to_be32(
 345                         agsize - be32_to_cpu(arec->ar_startblock));
 346
 347                 error = xfs_bwrite(bp);
 348                 xfs_buf_relse(bp);
 349                 if (error)
 350                         goto error0;
 351
 352                 /*
 353                  * CNT btree root block
 354                  */
 355                 bp = xfs_growfs_get_hdr_buf(mp,
 356                                 XFS_AGB_TO_DADDR(mp, agno, XFS_CNT_BLOCK(mp)),
 357                                 BTOBB(mp->m_sb.sb_blocksize), 0,
 358                                 &xfs_allocbt_buf_ops);
 359                 if (!bp) {
 360                         error = -ENOMEM;
 361                         goto error0;
 362                 }
 363
 364                 if (xfs_sb_version_hascrc(&mp->m_sb))
 365                         xfs_btree_init_block(mp, bp, XFS_ABTC_CRC_MAGIC, 0, 1,
 366                                                 agno, XFS_BTREE_CRC_BLOCKS);
 367                 else
 368                         xfs_btree_init_block(mp, bp, XFS_ABTC_MAGIC, 0, 1,
 369                                                 agno, 0);
 370
 371                 arec = XFS_ALLOC_REC_ADDR(mp, XFS_BUF_TO_BLOCK(bp), 1);
 372                 arec->ar_startblock = cpu_to_be32(mp->m_ag_prealloc_blocks);
 373                 arec->ar_blockcount = cpu_to_be32(
 374                         agsize - be32_to_cpu(arec->ar_startblock));
 375                 nfree += be32_to_cpu(arec->ar_blockcount);
 376
 377                 error = xfs_bwrite(bp);
 378                 xfs_buf_relse(bp);
 379                 if (error)
 380                         goto error0;
 381
 382                 /*
 383                  * INO btree root block
 384                  */
 385                 bp = xfs_growfs_get_hdr_buf(mp,
 386                                 XFS_AGB_TO_DADDR(mp, agno, XFS_IBT_BLOCK(mp)),
 387                                 BTOBB(mp->m_sb.sb_blocksize), 0,
 388                                 &xfs_inobt_buf_ops);
 389                 if (!bp) {
 390                         error = -ENOMEM;
 391                         goto error0;
 392                 }
 393
 394                 if (xfs_sb_version_hascrc(&mp->m_sb))
 395                         xfs_btree_init_block(mp, bp, XFS_IBT_CRC_MAGIC, 0, 0,
 396                                                 agno, XFS_BTREE_CRC_BLOCKS);
 397                 else
 398                         xfs_btree_init_block(mp, bp, XFS_IBT_MAGIC, 0, 0,
 399                                                 agno, 0);
 400
 401                 error = xfs_bwrite(bp);
 402                 xfs_buf_relse(bp);
 403                 if (error)
 404                         goto error0;
 405
 406                 /*
 407                  * FINO btree root block
 408                  */
 409                 if (xfs_sb_version_hasfinobt(&mp->m_sb)) {
 410                         bp = xfs_growfs_get_hdr_buf(mp,
 411                                 XFS_AGB_TO_DADDR(mp, agno, XFS_FIBT_BLOCK(mp)),
 412                                 BTOBB(mp->m_sb.sb_blocksize), 0,
 413                                 &xfs_inobt_buf_ops);
 414                         if (!bp) {
 415                                 error = -ENOMEM;
 416                                 goto error0;
 417                         }
 418
 419                         if (xfs_sb_version_hascrc(&mp->m_sb))
 420                                 xfs_btree_init_block(mp, bp, XFS_FIBT_CRC_MAGIC,
 421                                                      0, 0, agno,
 422                                                      XFS_BTREE_CRC_BLOCKS);
 423                         else
 424                                 xfs_btree_init_block(mp, bp, XFS_FIBT_MAGIC, 0,
 425                                                      0, agno, 0);
 426
 427                         error = xfs_bwrite(bp);
 428                         xfs_buf_relse(bp);
 429                         if (error)
 430                                 goto error0;
 431                 }
 432
 433         }
 434         xfs_trans_agblocks_delta(tp, nfree);
 435         /*
 436          * There are new blocks in the old last a.g.
 437          */
 438         if (new) {
 439                 /*
 440                  * Change the agi length.
 441                  */
 442                 error = xfs_ialloc_read_agi(mp, tp, agno, &bp);
 443                 if (error) {
 444                         goto error0;
 445                 }
 446                 ASSERT(bp);
 447                 agi = XFS_BUF_TO_AGI(bp);
 448                 be32_add_cpu(&agi->agi_length, new);
 449                 ASSERT(nagcount == oagcount ||
 450                        be32_to_cpu(agi->agi_length) == mp->m_sb.sb_agblocks);
 451                 xfs_ialloc_log_agi(tp, bp, XFS_AGI_LENGTH);
 452                 /*
 453                  * Change agf length.
 454                  */
 455                 error = xfs_alloc_read_agf(mp, tp, agno, 0, &bp);
 456                 if (error) {
 457                         goto error0;
 458                 }
 459                 ASSERT(bp);
 460                 agf = XFS_BUF_TO_AGF(bp);
 461                 be32_add_cpu(&agf->agf_length, new);
 462                 ASSERT(be32_to_cpu(agf->agf_length) ==
 463                        be32_to_cpu(agi->agi_length));
 464
 465                 xfs_alloc_log_agf(tp, bp, XFS_AGF_LENGTH);
 466                 /*
 467                  * Free the new space.
 468                  */
 469                 error = xfs_free_extent(tp, XFS_AGB_TO_FSB(mp, agno,
 470                         be32_to_cpu(agf->agf_length) - new), new);
 471                 if (error) {
 472                         goto error0;
 473                 }
 474         }
 475
 476         /*
 477          * Update changed superblock fields transactionally. These are not
 478          * seen by the rest of the world until the transaction commit applies
 479          * them atomically to the superblock.
 480          */
 481         if (nagcount > oagcount)
 482                 xfs_trans_mod_sb(tp, XFS_TRANS_SB_AGCOUNT, nagcount - oagcount);
 483         if (nb > mp->m_sb.sb_dblocks)
 484                 xfs_trans_mod_sb(tp, XFS_TRANS_SB_DBLOCKS,
 485                                  nb - mp->m_sb.sb_dblocks);
 486         if (nfree)
 487                 xfs_trans_mod_sb(tp, XFS_TRANS_SB_FDBLOCKS, nfree);
 488         if (dpct)
 489                 xfs_trans_mod_sb(tp, XFS_TRANS_SB_IMAXPCT, dpct);
 490         xfs_trans_set_sync(tp);
 491         error = xfs_trans_commit(tp);
 492         if (error)
 493                 return error;
 494
 495         /* New allocation groups fully initialized, so update mount struct */
 496         if (nagimax)
 497                 mp->m_maxagi = nagimax;
 498         if (mp->m_sb.sb_imax_pct) {
 499                 __uint64_t icount = mp->m_sb.sb_dblocks * mp->m_sb.sb_imax_pct;
 500                 do_div(icount, 100);
 501                 mp->m_maxicount = icount << mp->m_sb.sb_inopblog;
 502         } else
 503                 mp->m_maxicount = 0;
 504         xfs_set_low_space_thresholds(mp);
 505
 506         /* update secondary superblocks. */
 507         for (agno = 1; agno < nagcount; agno++) {
 508                 error = 0;
 509                 /*
 510                  * new secondary superblocks need to be zeroed, not read from
 511                  * disk as the contents of the new area we are growing into is
 512                  * completely unknown.
 513                  */
 514                 if (agno < oagcount) {
 515                         error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp,
 516                                   XFS_AGB_TO_DADDR(mp, agno, XFS_SB_BLOCK(mp)),
 517                                   XFS_FSS_TO_BB(mp, 1), 0, &bp,
 518                                   &xfs_sb_buf_ops);
 519                 } else {
 520                         bp = xfs_trans_get_buf(NULL, mp->m_ddev_targp,
 521                                   XFS_AGB_TO_DADDR(mp, agno, XFS_SB_BLOCK(mp)),
 522                                   XFS_FSS_TO_BB(mp, 1), 0);
 523                         if (bp) {
 524                                 bp->b_ops = &xfs_sb_buf_ops;
 525                                 xfs_buf_zero(bp, 0, BBTOB(bp->b_length));
 526                         } else
 527                                 error = -ENOMEM;
 528                 }
 529
 530                 /*
 531                  * If we get an error reading or writing alternate superblocks,
 532                  * continue.  xfs_repair chooses the "best" superblock based
 533                  * on most matches; if we break early, we'll leave more
 534                  * superblocks un-updated than updated, and xfs_repair may
 535                  * pick them over the properly-updated primary.
 536                  */
 537                 if (error) {
 538                         xfs_warn(mp,
 539                 "error %d reading secondary superblock for ag %d",
 540                                 error, agno);
 541                         saved_error = error;
 542                         continue;
 543                 }
 544                 xfs_sb_to_disk(XFS_BUF_TO_SBP(bp), &mp->m_sb);
 545
 546                 error = xfs_bwrite(bp);
 547                 xfs_buf_relse(bp);
 548                 if (error) {
 549                         xfs_warn(mp,
 550                 "write error %d updating secondary superblock for ag %d",
 551                                 error, agno);
 552                         saved_error = error;
 553                         continue;
 554                 }
 555         }
 556         return saved_error ? saved_error : error;
 557
 558  error0:
 559         xfs_trans_cancel(tp);
 560         return error;
 561 }
 562
 563 static int
 564 xfs_growfs_log_private(
 565         xfs_mount_t             *mp,    /* mount point for filesystem */
 566         xfs_growfs_log_t        *in)    /* growfs log input struct */
 567 {
 568         xfs_extlen_t            nb;
 569
 570         nb = in->newblocks;
 571         if (nb < XFS_MIN_LOG_BLOCKS || nb < XFS_B_TO_FSB(mp, XFS_MIN_LOG_BYTES))
 572                 return -EINVAL;
 573         if (nb == mp->m_sb.sb_logblocks &&
 574             in->isint == (mp->m_sb.sb_logstart != 0))
 575                 return -EINVAL;
 576         /*
 577          * Moving the log is hard, need new interfaces to sync
 578          * the log first, hold off all activity while moving it.
 579          * Can have shorter or longer log in the same space,
 580          * or transform internal to external log or vice versa.
 581          */
 582         return -ENOSYS;
 583 }
 584
 585 /*
 586  * protected versions of growfs function acquire and release locks on the mount
 587  * point - exported through ioctls: XFS_IOC_FSGROWFSDATA, XFS_IOC_FSGROWFSLOG,
 588  * XFS_IOC_FSGROWFSRT
 589  */
 590
 591
 592 int
 593 xfs_growfs_data(
 594         xfs_mount_t             *mp,
 595         xfs_growfs_data_t       *in)
 596 {
 597         int error;
 598
 599         if (!capable(CAP_SYS_ADMIN))
 600                 return -EPERM;
 601         if (!mutex_trylock(&mp->m_growlock))
 602                 return -EWOULDBLOCK;
 603         error = xfs_growfs_data_private(mp, in);
 604         /*
 605          * Increment the generation unconditionally, the error could be from
 606          * updating the secondary superblocks, in which case the new size
 607          * is live already.
 608          */
 609         mp->m_generation++;
 610         mutex_unlock(&mp->m_growlock);
 611         return error;
 612 }
 613
 614 int
 615 xfs_growfs_log(
 616         xfs_mount_t             *mp,
 617         xfs_growfs_log_t        *in)
 618 {
 619         int error;
 620
 621         if (!capable(CAP_SYS_ADMIN))
 622                 return -EPERM;
 623         if (!mutex_trylock(&mp->m_growlock))
 624                 return -EWOULDBLOCK;
 625         error = xfs_growfs_log_private(mp, in);
 626         mutex_unlock(&mp->m_growlock);
 627         return error;
 628 }
 629
 630 /*
 631  * exported through ioctl XFS_IOC_FSCOUNTS
 632  */
 633
 634 int
 635 xfs_fs_counts(
 636         xfs_mount_t             *mp,
 637         xfs_fsop_counts_t       *cnt)
 638 {
 639         cnt->allocino = percpu_counter_read_positive(&mp->m_icount);
 640         cnt->freeino = percpu_counter_read_positive(&mp->m_ifree);
 641         cnt->freedata = percpu_counter_read_positive(&mp->m_fdblocks) -
 642                                                         XFS_ALLOC_SET_ASIDE(mp);
 643
 644         spin_lock(&mp->m_sb_lock);
 645         cnt->freertx = mp->m_sb.sb_frextents;
 646         spin_unlock(&mp->m_sb_lock);
 647         return 0;
 648 }
 649
 650 /*
 651  * exported through ioctl XFS_IOC_SET_RESBLKS & XFS_IOC_GET_RESBLKS
 652  *
 653  * xfs_reserve_blocks is called to set m_resblks
 654  * in the in-core mount table. The number of unused reserved blocks
 655  * is kept in m_resblks_avail.
 656  *
 657  * Reserve the requested number of blocks if available. Otherwise return
 658  * as many as possible to satisfy the request. The actual number
 659  * reserved are returned in outval
 660  *
 661  * A null inval pointer indicates that only the current reserved blocks
 662  * available  should  be returned no settings are changed.
 663  */
 664
 665 int
 666 xfs_reserve_blocks(
 667         xfs_mount_t             *mp,
 668         __uint64_t              *inval,
 669         xfs_fsop_resblks_t      *outval)
 670 {
 671         __int64_t               lcounter, delta;
 672         __int64_t               fdblks_delta = 0;
 673         __uint64_t              request;
 674         __int64_t               free;
 675         int                     error = 0;
 676
 677         /* If inval is null, report current values and return */
 678         if (inval == (__uint64_t *)NULL) {
 679                 if (!outval)
 680                         return -EINVAL;
 681                 outval->resblks = mp->m_resblks;
 682                 outval->resblks_avail = mp->m_resblks_avail;
 683                 return 0;
 684         }
 685
 686         request = *inval;
 687
 688         /*
 689          * With per-cpu counters, this becomes an interesting problem. we need
 690          * to work out if we are freeing or allocation blocks first, then we can
 691          * do the modification as necessary.
 692          *
 693          * We do this under the m_sb_lock so that if we are near ENOSPC, we will
 694          * hold out any changes while we work out what to do. This means that
 695          * the amount of free space can change while we do this, so we need to
 696          * retry if we end up trying to reserve more space than is available.
 697          */
 698         spin_lock(&mp->m_sb_lock);
 699
 700         /*
 701          * If our previous reservation was larger than the current value,
 702          * then move any unused blocks back to the free pool. Modify the resblks
 703          * counters directly since we shouldn't have any problems unreserving
 704          * space.
 705          */
 706         if (mp->m_resblks > request) {
 707                 lcounter = mp->m_resblks_avail - request;
 708                 if (lcounter  > 0) {            /* release unused blocks */
 709                         fdblks_delta = lcounter;
 710                         mp->m_resblks_avail -= lcounter;
 711                 }
 712                 mp->m_resblks = request;
 713                 if (fdblks_delta) {
 714                         spin_unlock(&mp->m_sb_lock);
 715                         error = xfs_mod_fdblocks(mp, fdblks_delta, 0);
 716                         spin_lock(&mp->m_sb_lock);
 717                 }
 718
 719                 goto out;
 720         }
 721
 722         /*
 723          * If the request is larger than the current reservation, reserve the
 724          * blocks before we update the reserve counters. Sample m_fdblocks and
 725          * perform a partial reservation if the request exceeds free space.
 726          */
 727         error = -ENOSPC;
 728         do {
 729                 free = percpu_counter_sum(&mp->m_fdblocks) -
 730                                                         XFS_ALLOC_SET_ASIDE(mp);
 731                 if (!free)
 732                         break;
 733
 734                 delta = request - mp->m_resblks;
 735                 lcounter = free - delta;
 736                 if (lcounter < 0)
 737                         /* We can't satisfy the request, just get what we can */
 738                         fdblks_delta = free;
 739                 else
 740                         fdblks_delta = delta;
 741
 742                 /*
 743                  * We'll either succeed in getting space from the free block
 744                  * count or we'll get an ENOSPC. If we get a ENOSPC, it means
 745                  * things changed while we were calculating fdblks_delta and so
 746                  * we should try again to see if there is anything left to
 747                  * reserve.
 748                  *
 749                  * Don't set the reserved flag here - we don't want to reserve
 750                  * the extra reserve blocks from the reserve.....
 751                  */
 752                 spin_unlock(&mp->m_sb_lock);
 753                 error = xfs_mod_fdblocks(mp, -fdblks_delta, 0);
 754                 spin_lock(&mp->m_sb_lock);
 755         } while (error == -ENOSPC);
 756
 757         /*
 758          * Update the reserve counters if blocks have been successfully
 759          * allocated.
 760          */
 761         if (!error && fdblks_delta) {
 762                 mp->m_resblks += fdblks_delta;
 763                 mp->m_resblks_avail += fdblks_delta;
 764         }
 765
 766 out:
 767         if (outval) {
 768                 outval->resblks = mp->m_resblks;
 769                 outval->resblks_avail = mp->m_resblks_avail;
 770         }
 771
 772         spin_unlock(&mp->m_sb_lock);
 773         return error;
 774 }
 775
 776 int
 777 xfs_fs_goingdown(
 778         xfs_mount_t     *mp,
 779         __uint32_t      inflags)
 780 {
 781         switch (inflags) {
 782         case XFS_FSOP_GOING_FLAGS_DEFAULT: {
 783                 struct super_block *sb = freeze_bdev(mp->m_super->s_bdev);
 784
 785                 if (sb && !IS_ERR(sb)) {
 786                         xfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT);
 787                         thaw_bdev(sb->s_bdev, sb);
 788                 }
 789
 790                 break;
 791         }
 792         case XFS_FSOP_GOING_FLAGS_LOGFLUSH:
 793                 xfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT);
 794                 break;
 795         case XFS_FSOP_GOING_FLAGS_NOLOGFLUSH:
 796                 xfs_force_shutdown(mp,
 797                                 SHUTDOWN_FORCE_UMOUNT | SHUTDOWN_LOG_IO_ERROR);
 798                 break;
 799         default:
 800                 return -EINVAL;
 801         }
 802
 803         return 0;
 804 }
 805
 806 /*
 807  * Force a shutdown of the filesystem instantly while keeping the filesystem
 808  * consistent. We don't do an unmount here; just shutdown the shop, make sure
 809  * that absolutely nothing persistent happens to this filesystem after this
 810  * point.
 811  */
 812 void
 813 xfs_do_force_shutdown(
 814         xfs_mount_t     *mp,
 815         int             flags,
 816         char            *fname,
 817         int             lnnum)
 818 {
 819         int             logerror;
 820
 821         logerror = flags & SHUTDOWN_LOG_IO_ERROR;
 822
 823         if (!(flags & SHUTDOWN_FORCE_UMOUNT)) {
 824                 xfs_notice(mp,
 825         "%s(0x%x) called from line %d of file %s.  Return address = 0x%p",
 826                         __func__, flags, lnnum, fname, __return_address);
 827         }
 828         /*
 829          * No need to duplicate efforts.
 830          */
 831         if (XFS_FORCED_SHUTDOWN(mp) && !logerror)
 832                 return;
 833
 834         /*
 835          * This flags XFS_MOUNT_FS_SHUTDOWN, makes sure that we don't
 836          * queue up anybody new on the log reservations, and wakes up
 837          * everybody who's sleeping on log reservations to tell them
 838          * the bad news.
 839          */
 840         if (xfs_log_force_umount(mp, logerror))
 841                 return;
 842
 843         if (flags & SHUTDOWN_CORRUPT_INCORE) {
 844                 xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_CORRUPT,
 845     "Corruption of in-memory data detected.  Shutting down filesystem");
 846                 if (XFS_ERRLEVEL_HIGH <= xfs_error_level)
 847                         xfs_stack_trace();
 848         } else if (!(flags & SHUTDOWN_FORCE_UMOUNT)) {
 849                 if (logerror) {
 850                         xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_LOGERROR,
 851                 "Log I/O Error Detected.  Shutting down filesystem");
 852                 } else if (flags & SHUTDOWN_DEVICE_REQ) {
 853                         xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_IOERROR,
 854                 "All device paths lost.  Shutting down filesystem");
 855                 } else if (!(flags & SHUTDOWN_REMOTE_REQ)) {
 856                         xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_IOERROR,
 857                 "I/O Error Detected. Shutting down filesystem");
 858                 }
 859         }
 860         if (!(flags & SHUTDOWN_FORCE_UMOUNT)) {
 861                 xfs_alert(mp,
 862         "Please umount the filesystem and rectify the problem(s)");
 863         }
 864 }