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_types.h"
  21 #include "xfs_log.h"
  22 #include "xfs_trans.h"
  23 #include "xfs_sb.h"
  24 #include "xfs_ag.h"
  25 #include "xfs_mount.h"
  26 #include "xfs_bmap_btree.h"
  27 #include "xfs_alloc_btree.h"
  28 #include "xfs_ialloc_btree.h"
  29 #include "xfs_dinode.h"
  30 #include "xfs_inode.h"
  31 #include "xfs_inode_item.h"
  32 #include "xfs_btree.h"
  33 #include "xfs_error.h"
  34 #include "xfs_alloc.h"
  35 #include "xfs_ialloc.h"
  36 #include "xfs_fsops.h"
  37 #include "xfs_itable.h"
  38 #include "xfs_trans_space.h"
  39 #include "xfs_rtalloc.h"
  40 #include "xfs_filestream.h"
  41 #include "xfs_trace.h"
  42
  43 /*
  44  * File system operations
  45  */
  46
  47 int
  48 xfs_fs_geometry(
  49         xfs_mount_t             *mp,
  50         xfs_fsop_geom_t         *geo,
  51         int                     new_version)
  52 {
  53
  54         memset(geo, 0, sizeof(*geo));
  55
  56         geo->blocksize = mp->m_sb.sb_blocksize;
  57         geo->rtextsize = mp->m_sb.sb_rextsize;
  58         geo->agblocks = mp->m_sb.sb_agblocks;
  59         geo->agcount = mp->m_sb.sb_agcount;
  60         geo->logblocks = mp->m_sb.sb_logblocks;
  61         geo->sectsize = mp->m_sb.sb_sectsize;
  62         geo->inodesize = mp->m_sb.sb_inodesize;
  63         geo->imaxpct = mp->m_sb.sb_imax_pct;
  64         geo->datablocks = mp->m_sb.sb_dblocks;
  65         geo->rtblocks = mp->m_sb.sb_rblocks;
  66         geo->rtextents = mp->m_sb.sb_rextents;
  67         geo->logstart = mp->m_sb.sb_logstart;
  68         ASSERT(sizeof(geo->uuid)==sizeof(mp->m_sb.sb_uuid));
  69         memcpy(geo->uuid, &mp->m_sb.sb_uuid, sizeof(mp->m_sb.sb_uuid));
  70         if (new_version >= 2) {
  71                 geo->sunit = mp->m_sb.sb_unit;
  72                 geo->swidth = mp->m_sb.sb_width;
  73         }
  74         if (new_version >= 3) {
  75                 geo->version = XFS_FSOP_GEOM_VERSION;
  76                 geo->flags =
  77                         (xfs_sb_version_hasattr(&mp->m_sb) ?
  78                                 XFS_FSOP_GEOM_FLAGS_ATTR : 0) |
  79                         (xfs_sb_version_hasnlink(&mp->m_sb) ?
  80                                 XFS_FSOP_GEOM_FLAGS_NLINK : 0) |
  81                         (xfs_sb_version_hasquota(&mp->m_sb) ?
  82                                 XFS_FSOP_GEOM_FLAGS_QUOTA : 0) |
  83                         (xfs_sb_version_hasalign(&mp->m_sb) ?
  84                                 XFS_FSOP_GEOM_FLAGS_IALIGN : 0) |
  85                         (xfs_sb_version_hasdalign(&mp->m_sb) ?
  86                                 XFS_FSOP_GEOM_FLAGS_DALIGN : 0) |
  87                         (xfs_sb_version_hasshared(&mp->m_sb) ?
  88                                 XFS_FSOP_GEOM_FLAGS_SHARED : 0) |
  89                         (xfs_sb_version_hasextflgbit(&mp->m_sb) ?
  90                                 XFS_FSOP_GEOM_FLAGS_EXTFLG : 0) |
  91                         (xfs_sb_version_hasdirv2(&mp->m_sb) ?
  92                                 XFS_FSOP_GEOM_FLAGS_DIRV2 : 0) |
  93                         (xfs_sb_version_hassector(&mp->m_sb) ?
  94                                 XFS_FSOP_GEOM_FLAGS_SECTOR : 0) |
  95                         (xfs_sb_version_hasasciici(&mp->m_sb) ?
  96                                 XFS_FSOP_GEOM_FLAGS_DIRV2CI : 0) |
  97                         (xfs_sb_version_haslazysbcount(&mp->m_sb) ?
  98                                 XFS_FSOP_GEOM_FLAGS_LAZYSB : 0) |
  99                         (xfs_sb_version_hasattr2(&mp->m_sb) ?
 100                                 XFS_FSOP_GEOM_FLAGS_ATTR2 : 0) |
 101                         (xfs_sb_version_hasprojid32bit(&mp->m_sb) ?
 102                                 XFS_FSOP_GEOM_FLAGS_PROJID32 : 0) |
 103                         (xfs_sb_version_hascrc(&mp->m_sb) ?
 104                                 XFS_FSOP_GEOM_FLAGS_V5SB : 0);
 105                 geo->logsectsize = xfs_sb_version_hassector(&mp->m_sb) ?
 106                                 mp->m_sb.sb_logsectsize : BBSIZE;
 107                 geo->rtsectsize = mp->m_sb.sb_blocksize;
 108                 geo->dirblocksize = mp->m_dirblksize;
 109         }
 110         if (new_version >= 4) {
 111                 geo->flags |=
 112                         (xfs_sb_version_haslogv2(&mp->m_sb) ?
 113                                 XFS_FSOP_GEOM_FLAGS_LOGV2 : 0);
 114                 geo->logsunit = mp->m_sb.sb_logsunit;
 115         }
 116         return 0;
 117 }
 118
 119 static struct xfs_buf *
 120 xfs_growfs_get_hdr_buf(
 121         struct xfs_mount        *mp,
 122         xfs_daddr_t             blkno,
 123         size_t                  numblks,
 124         int                     flags,
 125         const struct xfs_buf_ops *ops)
 126 {
 127         struct xfs_buf          *bp;
 128
 129         bp = xfs_buf_get_uncached(mp->m_ddev_targp, numblks, flags);
 130         if (!bp)
 131                 return NULL;
 132
 133         xfs_buf_zero(bp, 0, BBTOB(bp->b_length));
 134         bp->b_bn = blkno;
 135         bp->b_maps[0].bm_bn = blkno;
 136         bp->b_ops = ops;
 137
 138         return bp;
 139 }
 140
 141 static int
 142 xfs_growfs_data_private(
 143         xfs_mount_t             *mp,            /* mount point for filesystem */
 144         xfs_growfs_data_t       *in)            /* growfs data input struct */
 145 {
 146         xfs_agf_t               *agf;
 147         struct xfs_agfl         *agfl;
 148         xfs_agi_t               *agi;
 149         xfs_agnumber_t          agno;
 150         xfs_extlen_t            agsize;
 151         xfs_extlen_t            tmpsize;
 152         xfs_alloc_rec_t         *arec;
 153         xfs_buf_t               *bp;
 154         int                     bucket;
 155         int                     dpct;
 156         int                     error;
 157         xfs_agnumber_t          nagcount;
 158         xfs_agnumber_t          nagimax = 0;
 159         xfs_rfsblock_t          nb, nb_mod;
 160         xfs_rfsblock_t          new;
 161         xfs_rfsblock_t          nfree;
 162         xfs_agnumber_t          oagcount;
 163         int                     pct;
 164         xfs_trans_t             *tp;
 165
 166         nb = in->newblocks;
 167         pct = in->imaxpct;
 168         if (nb < mp->m_sb.sb_dblocks || pct < 0 || pct > 100)
 169                 return XFS_ERROR(EINVAL);
 170         if ((error = xfs_sb_validate_fsb_count(&mp->m_sb, nb)))
 171                 return error;
 172         dpct = pct - mp->m_sb.sb_imax_pct;
 173         bp = xfs_buf_read_uncached(mp->m_ddev_targp,
 174                                 XFS_FSB_TO_BB(mp, nb) - XFS_FSS_TO_BB(mp, 1),
 175                                 XFS_FSS_TO_BB(mp, 1), 0, NULL);
 176         if (!bp)
 177                 return EIO;
 178         if (bp->b_error) {
 179                 int     error = bp->b_error;
 180                 xfs_buf_relse(bp);
 181                 return error;
 182         }
 183         xfs_buf_relse(bp);
 184
 185         new = nb;       /* use new as a temporary here */
 186         nb_mod = do_div(new, mp->m_sb.sb_agblocks);
 187         nagcount = new + (nb_mod != 0);
 188         if (nb_mod && nb_mod < XFS_MIN_AG_BLOCKS) {
 189                 nagcount--;
 190                 nb = (xfs_rfsblock_t)nagcount * mp->m_sb.sb_agblocks;
 191                 if (nb < mp->m_sb.sb_dblocks)
 192                         return XFS_ERROR(EINVAL);
 193         }
 194         new = nb - mp->m_sb.sb_dblocks;
 195         oagcount = mp->m_sb.sb_agcount;
 196
 197         /* allocate the new per-ag structures */
 198         if (nagcount > oagcount) {
 199                 error = xfs_initialize_perag(mp, nagcount, &nagimax);
 200                 if (error)
 201                         return error;
 202         }
 203
 204         tp = xfs_trans_alloc(mp, XFS_TRANS_GROWFS);
 205         tp->t_flags |= XFS_TRANS_RESERVE;
 206         if ((error = xfs_trans_reserve(tp, XFS_GROWFS_SPACE_RES(mp),
 207                         XFS_GROWDATA_LOG_RES(mp), 0, 0, 0))) {
 208                 xfs_trans_cancel(tp, 0);
 209                 return error;
 210         }
 211
 212         /*
 213          * Write new AG headers to disk. Non-transactional, but written
 214          * synchronously so they are completed prior to the growfs transaction
 215          * being logged.
 216          */
 217         nfree = 0;
 218         for (agno = nagcount - 1; agno >= oagcount; agno--, new -= agsize) {
 219                 /*
 220                  * AG freespace header block
 221                  */
 222                 bp = xfs_growfs_get_hdr_buf(mp,
 223                                 XFS_AG_DADDR(mp, agno, XFS_AGF_DADDR(mp)),
 224                                 XFS_FSS_TO_BB(mp, 1), 0,
 225                                 &xfs_agf_buf_ops);
 226                 if (!bp) {
 227                         error = ENOMEM;
 228                         goto error0;
 229                 }
 230
 231                 agf = XFS_BUF_TO_AGF(bp);
 232                 agf->agf_magicnum = cpu_to_be32(XFS_AGF_MAGIC);
 233                 agf->agf_versionnum = cpu_to_be32(XFS_AGF_VERSION);
 234                 agf->agf_seqno = cpu_to_be32(agno);
 235                 if (agno == nagcount - 1)
 236                         agsize =
 237                                 nb -
 238                                 (agno * (xfs_rfsblock_t)mp->m_sb.sb_agblocks);
 239                 else
 240                         agsize = mp->m_sb.sb_agblocks;
 241                 agf->agf_length = cpu_to_be32(agsize);
 242                 agf->agf_roots[XFS_BTNUM_BNOi] = cpu_to_be32(XFS_BNO_BLOCK(mp));
 243                 agf->agf_roots[XFS_BTNUM_CNTi] = cpu_to_be32(XFS_CNT_BLOCK(mp));
 244                 agf->agf_levels[XFS_BTNUM_BNOi] = cpu_to_be32(1);
 245                 agf->agf_levels[XFS_BTNUM_CNTi] = cpu_to_be32(1);
 246                 agf->agf_flfirst = 0;
 247                 agf->agf_fllast = cpu_to_be32(XFS_AGFL_SIZE(mp) - 1);
 248                 agf->agf_flcount = 0;
 249                 tmpsize = agsize - XFS_PREALLOC_BLOCKS(mp);
 250                 agf->agf_freeblks = cpu_to_be32(tmpsize);
 251                 agf->agf_longest = cpu_to_be32(tmpsize);
 252                 if (xfs_sb_version_hascrc(&mp->m_sb))
 253                         uuid_copy(&agf->agf_uuid, &mp->m_sb.sb_uuid);
 254
 255                 error = xfs_bwrite(bp);
 256                 xfs_buf_relse(bp);
 257                 if (error)
 258                         goto error0;
 259
 260                 /*
 261                  * AG freelist header block
 262                  */
 263                 bp = xfs_growfs_get_hdr_buf(mp,
 264                                 XFS_AG_DADDR(mp, agno, XFS_AGFL_DADDR(mp)),
 265                                 XFS_FSS_TO_BB(mp, 1), 0,
 266                                 &xfs_agfl_buf_ops);
 267                 if (!bp) {
 268                         error = ENOMEM;
 269                         goto error0;
 270                 }
 271
 272                 agfl = XFS_BUF_TO_AGFL(bp);
 273                 if (xfs_sb_version_hascrc(&mp->m_sb)) {
 274                         agfl->agfl_magicnum = cpu_to_be32(XFS_AGFL_MAGIC);
 275                         agfl->agfl_seqno = cpu_to_be32(agno);
 276                         uuid_copy(&agfl->agfl_uuid, &mp->m_sb.sb_uuid);
 277                 }
 278                 for (bucket = 0; bucket < XFS_AGFL_SIZE(mp); bucket++)
 279                         agfl->agfl_bno[bucket] = cpu_to_be32(NULLAGBLOCK);
 280
 281                 error = xfs_bwrite(bp);
 282                 xfs_buf_relse(bp);
 283                 if (error)
 284                         goto error0;
 285
 286                 /*
 287                  * AG inode header block
 288                  */
 289                 bp = xfs_growfs_get_hdr_buf(mp,
 290                                 XFS_AG_DADDR(mp, agno, XFS_AGI_DADDR(mp)),
 291                                 XFS_FSS_TO_BB(mp, 1), 0,
 292                                 &xfs_agi_buf_ops);
 293                 if (!bp) {
 294                         error = ENOMEM;
 295                         goto error0;
 296                 }
 297
 298                 agi = XFS_BUF_TO_AGI(bp);
 299                 agi->agi_magicnum = cpu_to_be32(XFS_AGI_MAGIC);
 300                 agi->agi_versionnum = cpu_to_be32(XFS_AGI_VERSION);
 301                 agi->agi_seqno = cpu_to_be32(agno);
 302                 agi->agi_length = cpu_to_be32(agsize);
 303                 agi->agi_count = 0;
 304                 agi->agi_root = cpu_to_be32(XFS_IBT_BLOCK(mp));
 305                 agi->agi_level = cpu_to_be32(1);
 306                 agi->agi_freecount = 0;
 307                 agi->agi_newino = cpu_to_be32(NULLAGINO);
 308                 agi->agi_dirino = cpu_to_be32(NULLAGINO);
 309                 if (xfs_sb_version_hascrc(&mp->m_sb))
 310                         uuid_copy(&agi->agi_uuid, &mp->m_sb.sb_uuid);
 311                 for (bucket = 0; bucket < XFS_AGI_UNLINKED_BUCKETS; bucket++)
 312                         agi->agi_unlinked[bucket] = cpu_to_be32(NULLAGINO);
 313
 314                 error = xfs_bwrite(bp);
 315                 xfs_buf_relse(bp);
 316                 if (error)
 317                         goto error0;
 318
 319                 /*
 320                  * BNO btree root block
 321                  */
 322                 bp = xfs_growfs_get_hdr_buf(mp,
 323                                 XFS_AGB_TO_DADDR(mp, agno, XFS_BNO_BLOCK(mp)),
 324                                 BTOBB(mp->m_sb.sb_blocksize), 0,
 325                                 &xfs_allocbt_buf_ops);
 326
 327                 if (!bp) {
 328                         error = ENOMEM;
 329                         goto error0;
 330                 }
 331
 332                 if (xfs_sb_version_hascrc(&mp->m_sb))
 333                         xfs_btree_init_block(mp, bp, XFS_ABTB_CRC_MAGIC, 0, 1,
 334                                                 agno, XFS_BTREE_CRC_BLOCKS);
 335                 else
 336                         xfs_btree_init_block(mp, bp, XFS_ABTB_MAGIC, 0, 1,
 337                                                 agno, 0);
 338
 339                 arec = XFS_ALLOC_REC_ADDR(mp, XFS_BUF_TO_BLOCK(bp), 1);
 340                 arec->ar_startblock = cpu_to_be32(XFS_PREALLOC_BLOCKS(mp));
 341                 arec->ar_blockcount = cpu_to_be32(
 342                         agsize - be32_to_cpu(arec->ar_startblock));
 343
 344                 error = xfs_bwrite(bp);
 345                 xfs_buf_relse(bp);
 346                 if (error)
 347                         goto error0;
 348
 349                 /*
 350                  * CNT btree root block
 351                  */
 352                 bp = xfs_growfs_get_hdr_buf(mp,
 353                                 XFS_AGB_TO_DADDR(mp, agno, XFS_CNT_BLOCK(mp)),
 354                                 BTOBB(mp->m_sb.sb_blocksize), 0,
 355                                 &xfs_allocbt_buf_ops);
 356                 if (!bp) {
 357                         error = ENOMEM;
 358                         goto error0;
 359                 }
 360
 361                 if (xfs_sb_version_hascrc(&mp->m_sb))
 362                         xfs_btree_init_block(mp, bp, XFS_ABTC_CRC_MAGIC, 0, 1,
 363                                                 agno, XFS_BTREE_CRC_BLOCKS);
 364                 else
 365                         xfs_btree_init_block(mp, bp, XFS_ABTC_MAGIC, 0, 1,
 366                                                 agno, 0);
 367
 368                 arec = XFS_ALLOC_REC_ADDR(mp, XFS_BUF_TO_BLOCK(bp), 1);
 369                 arec->ar_startblock = cpu_to_be32(XFS_PREALLOC_BLOCKS(mp));
 370                 arec->ar_blockcount = cpu_to_be32(
 371                         agsize - be32_to_cpu(arec->ar_startblock));
 372                 nfree += be32_to_cpu(arec->ar_blockcount);
 373
 374                 error = xfs_bwrite(bp);
 375                 xfs_buf_relse(bp);
 376                 if (error)
 377                         goto error0;
 378
 379                 /*
 380                  * INO btree root block
 381                  */
 382                 bp = xfs_growfs_get_hdr_buf(mp,
 383                                 XFS_AGB_TO_DADDR(mp, agno, XFS_IBT_BLOCK(mp)),
 384                                 BTOBB(mp->m_sb.sb_blocksize), 0,
 385                                 &xfs_inobt_buf_ops);
 386                 if (!bp) {
 387                         error = ENOMEM;
 388                         goto error0;
 389                 }
 390
 391                 if (xfs_sb_version_hascrc(&mp->m_sb))
 392                         xfs_btree_init_block(mp, bp, XFS_IBT_CRC_MAGIC, 0, 0,
 393                                                 agno, XFS_BTREE_CRC_BLOCKS);
 394                 else
 395                         xfs_btree_init_block(mp, bp, XFS_IBT_MAGIC, 0, 0,
 396                                                 agno, 0);
 397
 398                 error = xfs_bwrite(bp);
 399                 xfs_buf_relse(bp);
 400                 if (error)
 401                         goto error0;
 402         }
 403         xfs_trans_agblocks_delta(tp, nfree);
 404         /*
 405          * There are new blocks in the old last a.g.
 406          */
 407         if (new) {
 408                 /*
 409                  * Change the agi length.
 410                  */
 411                 error = xfs_ialloc_read_agi(mp, tp, agno, &bp);
 412                 if (error) {
 413                         goto error0;
 414                 }
 415                 ASSERT(bp);
 416                 agi = XFS_BUF_TO_AGI(bp);
 417                 be32_add_cpu(&agi->agi_length, new);
 418                 ASSERT(nagcount == oagcount ||
 419                        be32_to_cpu(agi->agi_length) == mp->m_sb.sb_agblocks);
 420                 xfs_ialloc_log_agi(tp, bp, XFS_AGI_LENGTH);
 421                 /*
 422                  * Change agf length.
 423                  */
 424                 error = xfs_alloc_read_agf(mp, tp, agno, 0, &bp);
 425                 if (error) {
 426                         goto error0;
 427                 }
 428                 ASSERT(bp);
 429                 agf = XFS_BUF_TO_AGF(bp);
 430                 be32_add_cpu(&agf->agf_length, new);
 431                 ASSERT(be32_to_cpu(agf->agf_length) ==
 432                        be32_to_cpu(agi->agi_length));
 433
 434                 xfs_alloc_log_agf(tp, bp, XFS_AGF_LENGTH);
 435                 /*
 436                  * Free the new space.
 437                  */
 438                 error = xfs_free_extent(tp, XFS_AGB_TO_FSB(mp, agno,
 439                         be32_to_cpu(agf->agf_length) - new), new);
 440                 if (error) {
 441                         goto error0;
 442                 }
 443         }
 444
 445         /*
 446          * Update changed superblock fields transactionally. These are not
 447          * seen by the rest of the world until the transaction commit applies
 448          * them atomically to the superblock.
 449          */
 450         if (nagcount > oagcount)
 451                 xfs_trans_mod_sb(tp, XFS_TRANS_SB_AGCOUNT, nagcount - oagcount);
 452         if (nb > mp->m_sb.sb_dblocks)
 453                 xfs_trans_mod_sb(tp, XFS_TRANS_SB_DBLOCKS,
 454                                  nb - mp->m_sb.sb_dblocks);
 455         if (nfree)
 456                 xfs_trans_mod_sb(tp, XFS_TRANS_SB_FDBLOCKS, nfree);
 457         if (dpct)
 458                 xfs_trans_mod_sb(tp, XFS_TRANS_SB_IMAXPCT, dpct);
 459         error = xfs_trans_commit(tp, 0);
 460         if (error)
 461                 return error;
 462
 463         /* New allocation groups fully initialized, so update mount struct */
 464         if (nagimax)
 465                 mp->m_maxagi = nagimax;
 466         if (mp->m_sb.sb_imax_pct) {
 467                 __uint64_t icount = mp->m_sb.sb_dblocks * mp->m_sb.sb_imax_pct;
 468                 do_div(icount, 100);
 469                 mp->m_maxicount = icount << mp->m_sb.sb_inopblog;
 470         } else
 471                 mp->m_maxicount = 0;
 472         xfs_set_low_space_thresholds(mp);
 473
 474         /* update secondary superblocks. */
 475         for (agno = 1; agno < nagcount; agno++) {
 476                 error = 0;
 477                 /*
 478                  * new secondary superblocks need to be zeroed, not read from
 479                  * disk as the contents of the new area we are growing into is
 480                  * completely unknown.
 481                  */
 482                 if (agno < oagcount) {
 483                         error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp,
 484                                   XFS_AGB_TO_DADDR(mp, agno, XFS_SB_BLOCK(mp)),
 485                                   XFS_FSS_TO_BB(mp, 1), 0, &bp,
 486                                   &xfs_sb_buf_ops);
 487                 } else {
 488                         bp = xfs_trans_get_buf(NULL, mp->m_ddev_targp,
 489                                   XFS_AGB_TO_DADDR(mp, agno, XFS_SB_BLOCK(mp)),
 490                                   XFS_FSS_TO_BB(mp, 1), 0);
 491                         if (bp) {
 492                                 bp->b_ops = &xfs_sb_buf_ops;
 493                                 xfs_buf_zero(bp, 0, BBTOB(bp->b_length));
 494                         } else
 495                                 error = ENOMEM;
 496                 }
 497
 498                 if (error) {
 499                         xfs_warn(mp,
 500                 "error %d reading secondary superblock for ag %d",
 501                                 error, agno);
 502                         break;
 503                 }
 504                 xfs_sb_to_disk(XFS_BUF_TO_SBP(bp), &mp->m_sb, XFS_SB_ALL_BITS);
 505
 506                 /*
 507                  * If we get an error writing out the alternate superblocks,
 508                  * just issue a warning and continue.  The real work is
 509                  * already done and committed.
 510                  */
 511                 error = xfs_bwrite(bp);
 512                 xfs_buf_relse(bp);
 513                 if (error) {
 514                         xfs_warn(mp,
 515                 "write error %d updating secondary superblock for ag %d",
 516                                 error, agno);
 517                         break; /* no point in continuing */
 518                 }
 519         }
 520         return error;
 521
 522  error0:
 523         xfs_trans_cancel(tp, XFS_TRANS_ABORT);
 524         return error;
 525 }
 526
 527 static int
 528 xfs_growfs_log_private(
 529         xfs_mount_t             *mp,    /* mount point for filesystem */
 530         xfs_growfs_log_t        *in)    /* growfs log input struct */
 531 {
 532         xfs_extlen_t            nb;
 533
 534         nb = in->newblocks;
 535         if (nb < XFS_MIN_LOG_BLOCKS || nb < XFS_B_TO_FSB(mp, XFS_MIN_LOG_BYTES))
 536                 return XFS_ERROR(EINVAL);
 537         if (nb == mp->m_sb.sb_logblocks &&
 538             in->isint == (mp->m_sb.sb_logstart != 0))
 539                 return XFS_ERROR(EINVAL);
 540         /*
 541          * Moving the log is hard, need new interfaces to sync
 542          * the log first, hold off all activity while moving it.
 543          * Can have shorter or longer log in the same space,
 544          * or transform internal to external log or vice versa.
 545          */
 546         return XFS_ERROR(ENOSYS);
 547 }
 548
 549 /*
 550  * protected versions of growfs function acquire and release locks on the mount
 551  * point - exported through ioctls: XFS_IOC_FSGROWFSDATA, XFS_IOC_FSGROWFSLOG,
 552  * XFS_IOC_FSGROWFSRT
 553  */
 554
 555
 556 int
 557 xfs_growfs_data(
 558         xfs_mount_t             *mp,
 559         xfs_growfs_data_t       *in)
 560 {
 561         int error;
 562
 563         if (!capable(CAP_SYS_ADMIN))
 564                 return XFS_ERROR(EPERM);
 565         if (!mutex_trylock(&mp->m_growlock))
 566                 return XFS_ERROR(EWOULDBLOCK);
 567         error = xfs_growfs_data_private(mp, in);
 568         mutex_unlock(&mp->m_growlock);
 569         return error;
 570 }
 571
 572 int
 573 xfs_growfs_log(
 574         xfs_mount_t             *mp,
 575         xfs_growfs_log_t        *in)
 576 {
 577         int error;
 578
 579         if (!capable(CAP_SYS_ADMIN))
 580                 return XFS_ERROR(EPERM);
 581         if (!mutex_trylock(&mp->m_growlock))
 582                 return XFS_ERROR(EWOULDBLOCK);
 583         error = xfs_growfs_log_private(mp, in);
 584         mutex_unlock(&mp->m_growlock);
 585         return error;
 586 }
 587
 588 /*
 589  * exported through ioctl XFS_IOC_FSCOUNTS
 590  */
 591
 592 int
 593 xfs_fs_counts(
 594         xfs_mount_t             *mp,
 595         xfs_fsop_counts_t       *cnt)
 596 {
 597         xfs_icsb_sync_counters(mp, XFS_ICSB_LAZY_COUNT);
 598         spin_lock(&mp->m_sb_lock);
 599         cnt->freedata = mp->m_sb.sb_fdblocks - XFS_ALLOC_SET_ASIDE(mp);
 600         cnt->freertx = mp->m_sb.sb_frextents;
 601         cnt->freeino = mp->m_sb.sb_ifree;
 602         cnt->allocino = mp->m_sb.sb_icount;
 603         spin_unlock(&mp->m_sb_lock);
 604         return 0;
 605 }
 606
 607 /*
 608  * exported through ioctl XFS_IOC_SET_RESBLKS & XFS_IOC_GET_RESBLKS
 609  *
 610  * xfs_reserve_blocks is called to set m_resblks
 611  * in the in-core mount table. The number of unused reserved blocks
 612  * is kept in m_resblks_avail.
 613  *
 614  * Reserve the requested number of blocks if available. Otherwise return
 615  * as many as possible to satisfy the request. The actual number
 616  * reserved are returned in outval
 617  *
 618  * A null inval pointer indicates that only the current reserved blocks
 619  * available  should  be returned no settings are changed.
 620  */
 621
 622 int
 623 xfs_reserve_blocks(
 624         xfs_mount_t             *mp,
 625         __uint64_t              *inval,
 626         xfs_fsop_resblks_t      *outval)
 627 {
 628         __int64_t               lcounter, delta, fdblks_delta;
 629         __uint64_t              request;
 630
 631         /* If inval is null, report current values and return */
 632         if (inval == (__uint64_t *)NULL) {
 633                 if (!outval)
 634                         return EINVAL;
 635                 outval->resblks = mp->m_resblks;
 636                 outval->resblks_avail = mp->m_resblks_avail;
 637                 return 0;
 638         }
 639
 640         request = *inval;
 641
 642         /*
 643          * With per-cpu counters, this becomes an interesting
 644          * problem. we needto work out if we are freeing or allocation
 645          * blocks first, then we can do the modification as necessary.
 646          *
 647          * We do this under the m_sb_lock so that if we are near
 648          * ENOSPC, we will hold out any changes while we work out
 649          * what to do. This means that the amount of free space can
 650          * change while we do this, so we need to retry if we end up
 651          * trying to reserve more space than is available.
 652          *
 653          * We also use the xfs_mod_incore_sb() interface so that we
 654          * don't have to care about whether per cpu counter are
 655          * enabled, disabled or even compiled in....
 656          */
 657 retry:
 658         spin_lock(&mp->m_sb_lock);
 659         xfs_icsb_sync_counters_locked(mp, 0);
 660
 661         /*
 662          * If our previous reservation was larger than the current value,
 663          * then move any unused blocks back to the free pool.
 664          */
 665         fdblks_delta = 0;
 666         if (mp->m_resblks > request) {
 667                 lcounter = mp->m_resblks_avail - request;
 668                 if (lcounter  > 0) {            /* release unused blocks */
 669                         fdblks_delta = lcounter;
 670                         mp->m_resblks_avail -= lcounter;
 671                 }
 672                 mp->m_resblks = request;
 673         } else {
 674                 __int64_t       free;
 675
 676                 free =  mp->m_sb.sb_fdblocks - XFS_ALLOC_SET_ASIDE(mp);
 677                 if (!free)
 678                         goto out; /* ENOSPC and fdblks_delta = 0 */
 679
 680                 delta = request - mp->m_resblks;
 681                 lcounter = free - delta;
 682                 if (lcounter < 0) {
 683                         /* We can't satisfy the request, just get what we can */
 684                         mp->m_resblks += free;
 685                         mp->m_resblks_avail += free;
 686                         fdblks_delta = -free;
 687                 } else {
 688                         fdblks_delta = -delta;
 689                         mp->m_resblks = request;
 690                         mp->m_resblks_avail += delta;
 691                 }
 692         }
 693 out:
 694         if (outval) {
 695                 outval->resblks = mp->m_resblks;
 696                 outval->resblks_avail = mp->m_resblks_avail;
 697         }
 698         spin_unlock(&mp->m_sb_lock);
 699
 700         if (fdblks_delta) {
 701                 /*
 702                  * If we are putting blocks back here, m_resblks_avail is
 703                  * already at its max so this will put it in the free pool.
 704                  *
 705                  * If we need space, we'll either succeed in getting it
 706                  * from the free block count or we'll get an enospc. If
 707                  * we get a ENOSPC, it means things changed while we were
 708                  * calculating fdblks_delta and so we should try again to
 709                  * see if there is anything left to reserve.
 710                  *
 711                  * Don't set the reserved flag here - we don't want to reserve
 712                  * the extra reserve blocks from the reserve.....
 713                  */
 714                 int error;
 715                 error = xfs_icsb_modify_counters(mp, XFS_SBS_FDBLOCKS,
 716                                                  fdblks_delta, 0);
 717                 if (error == ENOSPC)
 718                         goto retry;
 719         }
 720         return 0;
 721 }
 722
 723 /*
 724  * Dump a transaction into the log that contains no real change. This is needed
 725  * to be able to make the log dirty or stamp the current tail LSN into the log
 726  * during the covering operation.
 727  *
 728  * We cannot use an inode here for this - that will push dirty state back up
 729  * into the VFS and then periodic inode flushing will prevent log covering from
 730  * making progress. Hence we log a field in the superblock instead and use a
 731  * synchronous transaction to ensure the superblock is immediately unpinned
 732  * and can be written back.
 733  */
 734 int
 735 xfs_fs_log_dummy(
 736         xfs_mount_t     *mp)
 737 {
 738         xfs_trans_t     *tp;
 739         int             error;
 740
 741         tp = _xfs_trans_alloc(mp, XFS_TRANS_DUMMY1, KM_SLEEP);
 742         error = xfs_trans_reserve(tp, 0, XFS_SB_LOG_RES(mp), 0, 0,
 743                                   XFS_DEFAULT_LOG_COUNT);
 744         if (error) {
 745                 xfs_trans_cancel(tp, 0);
 746                 return error;
 747         }
 748
 749         /* log the UUID because it is an unchanging field */
 750         xfs_mod_sb(tp, XFS_SB_UUID);
 751         xfs_trans_set_sync(tp);
 752         return xfs_trans_commit(tp, 0);
 753 }
 754
 755 int
 756 xfs_fs_goingdown(
 757         xfs_mount_t     *mp,
 758         __uint32_t      inflags)
 759 {
 760         switch (inflags) {
 761         case XFS_FSOP_GOING_FLAGS_DEFAULT: {
 762                 struct super_block *sb = freeze_bdev(mp->m_super->s_bdev);
 763
 764                 if (sb && !IS_ERR(sb)) {
 765                         xfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT);
 766                         thaw_bdev(sb->s_bdev, sb);
 767                 }
 768
 769                 break;
 770         }
 771         case XFS_FSOP_GOING_FLAGS_LOGFLUSH:
 772                 xfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT);
 773                 break;
 774         case XFS_FSOP_GOING_FLAGS_NOLOGFLUSH:
 775                 xfs_force_shutdown(mp,
 776                                 SHUTDOWN_FORCE_UMOUNT | SHUTDOWN_LOG_IO_ERROR);
 777                 break;
 778         default:
 779                 return XFS_ERROR(EINVAL);
 780         }
 781
 782         return 0;
 783 }
 784
 785 /*
 786  * Force a shutdown of the filesystem instantly while keeping the filesystem
 787  * consistent. We don't do an unmount here; just shutdown the shop, make sure
 788  * that absolutely nothing persistent happens to this filesystem after this
 789  * point.
 790  */
 791 void
 792 xfs_do_force_shutdown(
 793         xfs_mount_t     *mp,
 794         int             flags,
 795         char            *fname,
 796         int             lnnum)
 797 {
 798         int             logerror;
 799
 800         logerror = flags & SHUTDOWN_LOG_IO_ERROR;
 801
 802         if (!(flags & SHUTDOWN_FORCE_UMOUNT)) {
 803                 xfs_notice(mp,
 804         "%s(0x%x) called from line %d of file %s.  Return address = 0x%p",
 805                         __func__, flags, lnnum, fname, __return_address);
 806         }
 807         /*
 808          * No need to duplicate efforts.
 809          */
 810         if (XFS_FORCED_SHUTDOWN(mp) && !logerror)
 811                 return;
 812
 813         /*
 814          * This flags XFS_MOUNT_FS_SHUTDOWN, makes sure that we don't
 815          * queue up anybody new on the log reservations, and wakes up
 816          * everybody who's sleeping on log reservations to tell them
 817          * the bad news.
 818          */
 819         if (xfs_log_force_umount(mp, logerror))
 820                 return;
 821
 822         if (flags & SHUTDOWN_CORRUPT_INCORE) {
 823                 xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_CORRUPT,
 824     "Corruption of in-memory data detected.  Shutting down filesystem");
 825                 if (XFS_ERRLEVEL_HIGH <= xfs_error_level)
 826                         xfs_stack_trace();
 827         } else if (!(flags & SHUTDOWN_FORCE_UMOUNT)) {
 828                 if (logerror) {
 829                         xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_LOGERROR,
 830                 "Log I/O Error Detected.  Shutting down filesystem");
 831                 } else if (flags & SHUTDOWN_DEVICE_REQ) {
 832                         xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_IOERROR,
 833                 "All device paths lost.  Shutting down filesystem");
 834                 } else if (!(flags & SHUTDOWN_REMOTE_REQ)) {
 835                         xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_IOERROR,
 836                 "I/O Error Detected. Shutting down filesystem");
 837                 }
 838         }
 839         if (!(flags & SHUTDOWN_FORCE_UMOUNT)) {
 840                 xfs_alert(mp,
 841         "Please umount the filesystem and rectify the problem(s)");
 842         }
 843 }