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_ag.h"
  26 #include "xfs_mount.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_dinode.h"
  44 #include "xfs_filestream.h"
  45
  46 /*
  47  * File system operations
  48  */
  49
  50 int
  51 xfs_fs_geometry(
  52         xfs_mount_t             *mp,
  53         xfs_fsop_geom_t         *geo,
  54         int                     new_version)
  55 {
  56
  57         memset(geo, 0, sizeof(*geo));
  58
  59         geo->blocksize = mp->m_sb.sb_blocksize;
  60         geo->rtextsize = mp->m_sb.sb_rextsize;
  61         geo->agblocks = mp->m_sb.sb_agblocks;
  62         geo->agcount = mp->m_sb.sb_agcount;
  63         geo->logblocks = mp->m_sb.sb_logblocks;
  64         geo->sectsize = mp->m_sb.sb_sectsize;
  65         geo->inodesize = mp->m_sb.sb_inodesize;
  66         geo->imaxpct = mp->m_sb.sb_imax_pct;
  67         geo->datablocks = mp->m_sb.sb_dblocks;
  68         geo->rtblocks = mp->m_sb.sb_rblocks;
  69         geo->rtextents = mp->m_sb.sb_rextents;
  70         geo->logstart = mp->m_sb.sb_logstart;
  71         ASSERT(sizeof(geo->uuid)==sizeof(mp->m_sb.sb_uuid));
  72         memcpy(geo->uuid, &mp->m_sb.sb_uuid, sizeof(mp->m_sb.sb_uuid));
  73         if (new_version >= 2) {
  74                 geo->sunit = mp->m_sb.sb_unit;
  75                 geo->swidth = mp->m_sb.sb_width;
  76         }
  77         if (new_version >= 3) {
  78                 geo->version = XFS_FSOP_GEOM_VERSION;
  79                 geo->flags = XFS_FSOP_GEOM_FLAGS_NLINK |
  80                              XFS_FSOP_GEOM_FLAGS_DIRV2 |
  81                         (xfs_sb_version_hasattr(&mp->m_sb) ?
  82                                 XFS_FSOP_GEOM_FLAGS_ATTR : 0) |
  83                         (xfs_sb_version_hasquota(&mp->m_sb) ?
  84                                 XFS_FSOP_GEOM_FLAGS_QUOTA : 0) |
  85                         (xfs_sb_version_hasalign(&mp->m_sb) ?
  86                                 XFS_FSOP_GEOM_FLAGS_IALIGN : 0) |
  87                         (xfs_sb_version_hasdalign(&mp->m_sb) ?
  88                                 XFS_FSOP_GEOM_FLAGS_DALIGN : 0) |
  89                         (xfs_sb_version_hasextflgbit(&mp->m_sb) ?
  90                                 XFS_FSOP_GEOM_FLAGS_EXTFLG : 0) |
  91                         (xfs_sb_version_hassector(&mp->m_sb) ?
  92                                 XFS_FSOP_GEOM_FLAGS_SECTOR : 0) |
  93                         (xfs_sb_version_hasasciici(&mp->m_sb) ?
  94                                 XFS_FSOP_GEOM_FLAGS_DIRV2CI : 0) |
  95                         (xfs_sb_version_haslazysbcount(&mp->m_sb) ?
  96                                 XFS_FSOP_GEOM_FLAGS_LAZYSB : 0) |
  97                         (xfs_sb_version_hasattr2(&mp->m_sb) ?
  98                                 XFS_FSOP_GEOM_FLAGS_ATTR2 : 0) |
  99                         (xfs_sb_version_hasprojid32bit(&mp->m_sb) ?
 100                                 XFS_FSOP_GEOM_FLAGS_PROJID32 : 0) |
 101                         (xfs_sb_version_hascrc(&mp->m_sb) ?
 102                                 XFS_FSOP_GEOM_FLAGS_V5SB : 0) |
 103                         (xfs_sb_version_hasftype(&mp->m_sb) ?
 104                                 XFS_FSOP_GEOM_FLAGS_FTYPE : 0) |
 105                         (xfs_sb_version_hasfinobt(&mp->m_sb) ?
 106                                 XFS_FSOP_GEOM_FLAGS_FINOBT : 0);
 107                 geo->logsectsize = xfs_sb_version_hassector(&mp->m_sb) ?
 108                                 mp->m_sb.sb_logsectsize : BBSIZE;
 109                 geo->rtsectsize = mp->m_sb.sb_blocksize;
 110                 geo->dirblocksize = mp->m_dir_geo->blksize;
 111         }
 112         if (new_version >= 4) {
 113                 geo->flags |=
 114                         (xfs_sb_version_haslogv2(&mp->m_sb) ?
 115                                 XFS_FSOP_GEOM_FLAGS_LOGV2 : 0);
 116                 geo->logsunit = mp->m_sb.sb_logsunit;
 117         }
 118         return 0;
 119 }
 120
 121 static struct xfs_buf *
 122 xfs_growfs_get_hdr_buf(
 123         struct xfs_mount        *mp,
 124         xfs_daddr_t             blkno,
 125         size_t                  numblks,
 126         int                     flags,
 127         const struct xfs_buf_ops *ops)
 128 {
 129         struct xfs_buf          *bp;
 130
 131         bp = xfs_buf_get_uncached(mp->m_ddev_targp, numblks, flags);
 132         if (!bp)
 133                 return NULL;
 134
 135         xfs_buf_zero(bp, 0, BBTOB(bp->b_length));
 136         bp->b_bn = blkno;
 137         bp->b_maps[0].bm_bn = blkno;
 138         bp->b_ops = ops;
 139
 140         return bp;
 141 }
 142
 143 static int
 144 xfs_growfs_data_private(
 145         xfs_mount_t             *mp,            /* mount point for filesystem */
 146         xfs_growfs_data_t       *in)            /* growfs data input struct */
 147 {
 148         xfs_agf_t               *agf;
 149         struct xfs_agfl         *agfl;
 150         xfs_agi_t               *agi;
 151         xfs_agnumber_t          agno;
 152         xfs_extlen_t            agsize;
 153         xfs_extlen_t            tmpsize;
 154         xfs_alloc_rec_t         *arec;
 155         xfs_buf_t               *bp;
 156         int                     bucket;
 157         int                     dpct;
 158         int                     error, saved_error = 0;
 159         xfs_agnumber_t          nagcount;
 160         xfs_agnumber_t          nagimax = 0;
 161         xfs_rfsblock_t          nb, nb_mod;
 162         xfs_rfsblock_t          new;
 163         xfs_rfsblock_t          nfree;
 164         xfs_agnumber_t          oagcount;
 165         int                     pct;
 166         xfs_trans_t             *tp;
 167
 168         nb = in->newblocks;
 169         pct = in->imaxpct;
 170         if (nb < mp->m_sb.sb_dblocks || pct < 0 || pct > 100)
 171                 return -EINVAL;
 172         if ((error = xfs_sb_validate_fsb_count(&mp->m_sb, nb)))
 173                 return error;
 174         dpct = pct - mp->m_sb.sb_imax_pct;
 175         error = xfs_buf_read_uncached(mp->m_ddev_targp,
 176                                 XFS_FSB_TO_BB(mp, nb) - XFS_FSS_TO_BB(mp, 1),
 177                                 XFS_FSS_TO_BB(mp, 1), 0, &bp, NULL);
 178         if (error)
 179                 return error;
 180         xfs_buf_relse(bp);
 181
 182         new = nb;       /* use new as a temporary here */
 183         nb_mod = do_div(new, mp->m_sb.sb_agblocks);
 184         nagcount = new + (nb_mod != 0);
 185         if (nb_mod && nb_mod < XFS_MIN_AG_BLOCKS) {
 186                 nagcount--;
 187                 nb = (xfs_rfsblock_t)nagcount * mp->m_sb.sb_agblocks;
 188                 if (nb < mp->m_sb.sb_dblocks)
 189                         return -EINVAL;
 190         }
 191         new = nb - mp->m_sb.sb_dblocks;
 192         oagcount = mp->m_sb.sb_agcount;
 193
 194         /* allocate the new per-ag structures */
 195         if (nagcount > oagcount) {
 196                 error = xfs_initialize_perag(mp, nagcount, &nagimax);
 197                 if (error)
 198                         return error;
 199         }
 200
 201         tp = xfs_trans_alloc(mp, XFS_TRANS_GROWFS);
 202         tp->t_flags |= XFS_TRANS_RESERVE;
 203         error = xfs_trans_reserve(tp, &M_RES(mp)->tr_growdata,
 204                                   XFS_GROWFS_SPACE_RES(mp), 0);
 205         if (error) {
 206                 xfs_trans_cancel(tp, 0);
 207                 return error;
 208         }
 209
 210         /*
 211          * Write new AG headers to disk. Non-transactional, but written
 212          * synchronously so they are completed prior to the growfs transaction
 213          * being logged.
 214          */
 215         nfree = 0;
 216         for (agno = nagcount - 1; agno >= oagcount; agno--, new -= agsize) {
 217                 __be32  *agfl_bno;
 218
 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
 279                 agfl_bno = XFS_BUF_TO_AGFL_BNO(mp, bp);
 280                 for (bucket = 0; bucket < XFS_AGFL_SIZE(mp); bucket++)
 281                         agfl_bno[bucket] = cpu_to_be32(NULLAGBLOCK);
 282
 283                 error = xfs_bwrite(bp);
 284                 xfs_buf_relse(bp);
 285                 if (error)
 286                         goto error0;
 287
 288                 /*
 289                  * AG inode header block
 290                  */
 291                 bp = xfs_growfs_get_hdr_buf(mp,
 292                                 XFS_AG_DADDR(mp, agno, XFS_AGI_DADDR(mp)),
 293                                 XFS_FSS_TO_BB(mp, 1), 0,
 294                                 &xfs_agi_buf_ops);
 295                 if (!bp) {
 296                         error = -ENOMEM;
 297                         goto error0;
 298                 }
 299
 300                 agi = XFS_BUF_TO_AGI(bp);
 301                 agi->agi_magicnum = cpu_to_be32(XFS_AGI_MAGIC);
 302                 agi->agi_versionnum = cpu_to_be32(XFS_AGI_VERSION);
 303                 agi->agi_seqno = cpu_to_be32(agno);
 304                 agi->agi_length = cpu_to_be32(agsize);
 305                 agi->agi_count = 0;
 306                 agi->agi_root = cpu_to_be32(XFS_IBT_BLOCK(mp));
 307                 agi->agi_level = cpu_to_be32(1);
 308                 agi->agi_freecount = 0;
 309                 agi->agi_newino = cpu_to_be32(NULLAGINO);
 310                 agi->agi_dirino = cpu_to_be32(NULLAGINO);
 311                 if (xfs_sb_version_hascrc(&mp->m_sb))
 312                         uuid_copy(&agi->agi_uuid, &mp->m_sb.sb_uuid);
 313                 if (xfs_sb_version_hasfinobt(&mp->m_sb)) {
 314                         agi->agi_free_root = cpu_to_be32(XFS_FIBT_BLOCK(mp));
 315                         agi->agi_free_level = cpu_to_be32(1);
 316                 }
 317                 for (bucket = 0; bucket < XFS_AGI_UNLINKED_BUCKETS; bucket++)
 318                         agi->agi_unlinked[bucket] = cpu_to_be32(NULLAGINO);
 319
 320                 error = xfs_bwrite(bp);
 321                 xfs_buf_relse(bp);
 322                 if (error)
 323                         goto error0;
 324
 325                 /*
 326                  * BNO btree root block
 327                  */
 328                 bp = xfs_growfs_get_hdr_buf(mp,
 329                                 XFS_AGB_TO_DADDR(mp, agno, XFS_BNO_BLOCK(mp)),
 330                                 BTOBB(mp->m_sb.sb_blocksize), 0,
 331                                 &xfs_allocbt_buf_ops);
 332
 333                 if (!bp) {
 334                         error = -ENOMEM;
 335                         goto error0;
 336                 }
 337
 338                 if (xfs_sb_version_hascrc(&mp->m_sb))
 339                         xfs_btree_init_block(mp, bp, XFS_ABTB_CRC_MAGIC, 0, 1,
 340                                                 agno, XFS_BTREE_CRC_BLOCKS);
 341                 else
 342                         xfs_btree_init_block(mp, bp, XFS_ABTB_MAGIC, 0, 1,
 343                                                 agno, 0);
 344
 345                 arec = XFS_ALLOC_REC_ADDR(mp, XFS_BUF_TO_BLOCK(bp), 1);
 346                 arec->ar_startblock = cpu_to_be32(XFS_PREALLOC_BLOCKS(mp));
 347                 arec->ar_blockcount = cpu_to_be32(
 348                         agsize - be32_to_cpu(arec->ar_startblock));
 349
 350                 error = xfs_bwrite(bp);
 351                 xfs_buf_relse(bp);
 352                 if (error)
 353                         goto error0;
 354
 355                 /*
 356                  * CNT btree root block
 357                  */
 358                 bp = xfs_growfs_get_hdr_buf(mp,
 359                                 XFS_AGB_TO_DADDR(mp, agno, XFS_CNT_BLOCK(mp)),
 360                                 BTOBB(mp->m_sb.sb_blocksize), 0,
 361                                 &xfs_allocbt_buf_ops);
 362                 if (!bp) {
 363                         error = -ENOMEM;
 364                         goto error0;
 365                 }
 366
 367                 if (xfs_sb_version_hascrc(&mp->m_sb))
 368                         xfs_btree_init_block(mp, bp, XFS_ABTC_CRC_MAGIC, 0, 1,
 369                                                 agno, XFS_BTREE_CRC_BLOCKS);
 370                 else
 371                         xfs_btree_init_block(mp, bp, XFS_ABTC_MAGIC, 0, 1,
 372                                                 agno, 0);
 373
 374                 arec = XFS_ALLOC_REC_ADDR(mp, XFS_BUF_TO_BLOCK(bp), 1);
 375                 arec->ar_startblock = cpu_to_be32(XFS_PREALLOC_BLOCKS(mp));
 376                 arec->ar_blockcount = cpu_to_be32(
 377                         agsize - be32_to_cpu(arec->ar_startblock));
 378                 nfree += be32_to_cpu(arec->ar_blockcount);
 379
 380                 error = xfs_bwrite(bp);
 381                 xfs_buf_relse(bp);
 382                 if (error)
 383                         goto error0;
 384
 385                 /*
 386                  * INO btree root block
 387                  */
 388                 bp = xfs_growfs_get_hdr_buf(mp,
 389                                 XFS_AGB_TO_DADDR(mp, agno, XFS_IBT_BLOCK(mp)),
 390                                 BTOBB(mp->m_sb.sb_blocksize), 0,
 391                                 &xfs_inobt_buf_ops);
 392                 if (!bp) {
 393                         error = -ENOMEM;
 394                         goto error0;
 395                 }
 396
 397                 if (xfs_sb_version_hascrc(&mp->m_sb))
 398                         xfs_btree_init_block(mp, bp, XFS_IBT_CRC_MAGIC, 0, 0,
 399                                                 agno, XFS_BTREE_CRC_BLOCKS);
 400                 else
 401                         xfs_btree_init_block(mp, bp, XFS_IBT_MAGIC, 0, 0,
 402                                                 agno, 0);
 403
 404                 error = xfs_bwrite(bp);
 405                 xfs_buf_relse(bp);
 406                 if (error)
 407                         goto error0;
 408
 409                 /*
 410                  * FINO btree root block
 411                  */
 412                 if (xfs_sb_version_hasfinobt(&mp->m_sb)) {
 413                         bp = xfs_growfs_get_hdr_buf(mp,
 414                                 XFS_AGB_TO_DADDR(mp, agno, XFS_FIBT_BLOCK(mp)),
 415                                 BTOBB(mp->m_sb.sb_blocksize), 0,
 416                                 &xfs_inobt_buf_ops);
 417                         if (!bp) {
 418                                 error = -ENOMEM;
 419                                 goto error0;
 420                         }
 421
 422                         if (xfs_sb_version_hascrc(&mp->m_sb))
 423                                 xfs_btree_init_block(mp, bp, XFS_FIBT_CRC_MAGIC,
 424                                                      0, 0, agno,
 425                                                      XFS_BTREE_CRC_BLOCKS);
 426                         else
 427                                 xfs_btree_init_block(mp, bp, XFS_FIBT_MAGIC, 0,
 428                                                      0, agno, 0);
 429
 430                         error = xfs_bwrite(bp);
 431                         xfs_buf_relse(bp);
 432                         if (error)
 433                                 goto error0;
 434                 }
 435
 436         }
 437         xfs_trans_agblocks_delta(tp, nfree);
 438         /*
 439          * There are new blocks in the old last a.g.
 440          */
 441         if (new) {
 442                 /*
 443                  * Change the agi length.
 444                  */
 445                 error = xfs_ialloc_read_agi(mp, tp, agno, &bp);
 446                 if (error) {
 447                         goto error0;
 448                 }
 449                 ASSERT(bp);
 450                 agi = XFS_BUF_TO_AGI(bp);
 451                 be32_add_cpu(&agi->agi_length, new);
 452                 ASSERT(nagcount == oagcount ||
 453                        be32_to_cpu(agi->agi_length) == mp->m_sb.sb_agblocks);
 454                 xfs_ialloc_log_agi(tp, bp, XFS_AGI_LENGTH);
 455                 /*
 456                  * Change agf length.
 457                  */
 458                 error = xfs_alloc_read_agf(mp, tp, agno, 0, &bp);
 459                 if (error) {
 460                         goto error0;
 461                 }
 462                 ASSERT(bp);
 463                 agf = XFS_BUF_TO_AGF(bp);
 464                 be32_add_cpu(&agf->agf_length, new);
 465                 ASSERT(be32_to_cpu(agf->agf_length) ==
 466                        be32_to_cpu(agi->agi_length));
 467
 468                 xfs_alloc_log_agf(tp, bp, XFS_AGF_LENGTH);
 469                 /*
 470                  * Free the new space.
 471                  */
 472                 error = xfs_free_extent(tp, XFS_AGB_TO_FSB(mp, agno,
 473                         be32_to_cpu(agf->agf_length) - new), new);
 474                 if (error) {
 475                         goto error0;
 476                 }
 477         }
 478
 479         /*
 480          * Update changed superblock fields transactionally. These are not
 481          * seen by the rest of the world until the transaction commit applies
 482          * them atomically to the superblock.
 483          */
 484         if (nagcount > oagcount)
 485                 xfs_trans_mod_sb(tp, XFS_TRANS_SB_AGCOUNT, nagcount - oagcount);
 486         if (nb > mp->m_sb.sb_dblocks)
 487                 xfs_trans_mod_sb(tp, XFS_TRANS_SB_DBLOCKS,
 488                                  nb - mp->m_sb.sb_dblocks);
 489         if (nfree)
 490                 xfs_trans_mod_sb(tp, XFS_TRANS_SB_FDBLOCKS, nfree);
 491         if (dpct)
 492                 xfs_trans_mod_sb(tp, XFS_TRANS_SB_IMAXPCT, dpct);
 493         error = xfs_trans_commit(tp, 0);
 494         if (error)
 495                 return error;
 496
 497         /* New allocation groups fully initialized, so update mount struct */
 498         if (nagimax)
 499                 mp->m_maxagi = nagimax;
 500         if (mp->m_sb.sb_imax_pct) {
 501                 __uint64_t icount = mp->m_sb.sb_dblocks * mp->m_sb.sb_imax_pct;
 502                 do_div(icount, 100);
 503                 mp->m_maxicount = icount << mp->m_sb.sb_inopblog;
 504         } else
 505                 mp->m_maxicount = 0;
 506         xfs_set_low_space_thresholds(mp);
 507
 508         /* update secondary superblocks. */
 509         for (agno = 1; agno < nagcount; agno++) {
 510                 error = 0;
 511                 /*
 512                  * new secondary superblocks need to be zeroed, not read from
 513                  * disk as the contents of the new area we are growing into is
 514                  * completely unknown.
 515                  */
 516                 if (agno < oagcount) {
 517                         error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp,
 518                                   XFS_AGB_TO_DADDR(mp, agno, XFS_SB_BLOCK(mp)),
 519                                   XFS_FSS_TO_BB(mp, 1), 0, &bp,
 520                                   &xfs_sb_buf_ops);
 521                 } else {
 522                         bp = xfs_trans_get_buf(NULL, mp->m_ddev_targp,
 523                                   XFS_AGB_TO_DADDR(mp, agno, XFS_SB_BLOCK(mp)),
 524                                   XFS_FSS_TO_BB(mp, 1), 0);
 525                         if (bp) {
 526                                 bp->b_ops = &xfs_sb_buf_ops;
 527                                 xfs_buf_zero(bp, 0, BBTOB(bp->b_length));
 528                         } else
 529                                 error = -ENOMEM;
 530                 }
 531
 532                 /*
 533                  * If we get an error reading or writing alternate superblocks,
 534                  * continue.  xfs_repair chooses the "best" superblock based
 535                  * on most matches; if we break early, we'll leave more
 536                  * superblocks un-updated than updated, and xfs_repair may
 537                  * pick them over the properly-updated primary.
 538                  */
 539                 if (error) {
 540                         xfs_warn(mp,
 541                 "error %d reading secondary superblock for ag %d",
 542                                 error, agno);
 543                         saved_error = error;
 544                         continue;
 545                 }
 546                 xfs_sb_to_disk(XFS_BUF_TO_SBP(bp), &mp->m_sb, XFS_SB_ALL_BITS);
 547
 548                 error = xfs_bwrite(bp);
 549                 xfs_buf_relse(bp);
 550                 if (error) {
 551                         xfs_warn(mp,
 552                 "write error %d updating secondary superblock for ag %d",
 553                                 error, agno);
 554                         saved_error = error;
 555                         continue;
 556                 }
 557         }
 558         return saved_error ? saved_error : error;
 559
 560  error0:
 561         xfs_trans_cancel(tp, XFS_TRANS_ABORT);
 562         return error;
 563 }
 564
 565 static int
 566 xfs_growfs_log_private(
 567         xfs_mount_t             *mp,    /* mount point for filesystem */
 568         xfs_growfs_log_t        *in)    /* growfs log input struct */
 569 {
 570         xfs_extlen_t            nb;
 571
 572         nb = in->newblocks;
 573         if (nb < XFS_MIN_LOG_BLOCKS || nb < XFS_B_TO_FSB(mp, XFS_MIN_LOG_BYTES))
 574                 return -EINVAL;
 575         if (nb == mp->m_sb.sb_logblocks &&
 576             in->isint == (mp->m_sb.sb_logstart != 0))
 577                 return -EINVAL;
 578         /*
 579          * Moving the log is hard, need new interfaces to sync
 580          * the log first, hold off all activity while moving it.
 581          * Can have shorter or longer log in the same space,
 582          * or transform internal to external log or vice versa.
 583          */
 584         return -ENOSYS;
 585 }
 586
 587 /*
 588  * protected versions of growfs function acquire and release locks on the mount
 589  * point - exported through ioctls: XFS_IOC_FSGROWFSDATA, XFS_IOC_FSGROWFSLOG,
 590  * XFS_IOC_FSGROWFSRT
 591  */
 592
 593
 594 int
 595 xfs_growfs_data(
 596         xfs_mount_t             *mp,
 597         xfs_growfs_data_t       *in)
 598 {
 599         int error;
 600
 601         if (!capable(CAP_SYS_ADMIN))
 602                 return -EPERM;
 603         if (!mutex_trylock(&mp->m_growlock))
 604                 return -EWOULDBLOCK;
 605         error = xfs_growfs_data_private(mp, in);
 606         mutex_unlock(&mp->m_growlock);
 607         return error;
 608 }
 609
 610 int
 611 xfs_growfs_log(
 612         xfs_mount_t             *mp,
 613         xfs_growfs_log_t        *in)
 614 {
 615         int error;
 616
 617         if (!capable(CAP_SYS_ADMIN))
 618                 return -EPERM;
 619         if (!mutex_trylock(&mp->m_growlock))
 620                 return -EWOULDBLOCK;
 621         error = xfs_growfs_log_private(mp, in);
 622         mutex_unlock(&mp->m_growlock);
 623         return error;
 624 }
 625
 626 /*
 627  * exported through ioctl XFS_IOC_FSCOUNTS
 628  */
 629
 630 int
 631 xfs_fs_counts(
 632         xfs_mount_t             *mp,
 633         xfs_fsop_counts_t       *cnt)
 634 {
 635         xfs_icsb_sync_counters(mp, XFS_ICSB_LAZY_COUNT);
 636         spin_lock(&mp->m_sb_lock);
 637         cnt->freedata = mp->m_sb.sb_fdblocks - XFS_ALLOC_SET_ASIDE(mp);
 638         cnt->freertx = mp->m_sb.sb_frextents;
 639         cnt->freeino = mp->m_sb.sb_ifree;
 640         cnt->allocino = mp->m_sb.sb_icount;
 641         spin_unlock(&mp->m_sb_lock);
 642         return 0;
 643 }
 644
 645 /*
 646  * exported through ioctl XFS_IOC_SET_RESBLKS & XFS_IOC_GET_RESBLKS
 647  *
 648  * xfs_reserve_blocks is called to set m_resblks
 649  * in the in-core mount table. The number of unused reserved blocks
 650  * is kept in m_resblks_avail.
 651  *
 652  * Reserve the requested number of blocks if available. Otherwise return
 653  * as many as possible to satisfy the request. The actual number
 654  * reserved are returned in outval
 655  *
 656  * A null inval pointer indicates that only the current reserved blocks
 657  * available  should  be returned no settings are changed.
 658  */
 659
 660 int
 661 xfs_reserve_blocks(
 662         xfs_mount_t             *mp,
 663         __uint64_t              *inval,
 664         xfs_fsop_resblks_t      *outval)
 665 {
 666         __int64_t               lcounter, delta, fdblks_delta;
 667         __uint64_t              request;
 668
 669         /* If inval is null, report current values and return */
 670         if (inval == (__uint64_t *)NULL) {
 671                 if (!outval)
 672                         return -EINVAL;
 673                 outval->resblks = mp->m_resblks;
 674                 outval->resblks_avail = mp->m_resblks_avail;
 675                 return 0;
 676         }
 677
 678         request = *inval;
 679
 680         /*
 681          * With per-cpu counters, this becomes an interesting
 682          * problem. we needto work out if we are freeing or allocation
 683          * blocks first, then we can do the modification as necessary.
 684          *
 685          * We do this under the m_sb_lock so that if we are near
 686          * ENOSPC, we will hold out any changes while we work out
 687          * what to do. This means that the amount of free space can
 688          * change while we do this, so we need to retry if we end up
 689          * trying to reserve more space than is available.
 690          *
 691          * We also use the xfs_mod_incore_sb() interface so that we
 692          * don't have to care about whether per cpu counter are
 693          * enabled, disabled or even compiled in....
 694          */
 695 retry:
 696         spin_lock(&mp->m_sb_lock);
 697         xfs_icsb_sync_counters_locked(mp, 0);
 698
 699         /*
 700          * If our previous reservation was larger than the current value,
 701          * then move any unused blocks back to the free pool.
 702          */
 703         fdblks_delta = 0;
 704         if (mp->m_resblks > request) {
 705                 lcounter = mp->m_resblks_avail - request;
 706                 if (lcounter  > 0) {            /* release unused blocks */
 707                         fdblks_delta = lcounter;
 708                         mp->m_resblks_avail -= lcounter;
 709                 }
 710                 mp->m_resblks = request;
 711         } else {
 712                 __int64_t       free;
 713
 714                 free =  mp->m_sb.sb_fdblocks - XFS_ALLOC_SET_ASIDE(mp);
 715                 if (!free)
 716                         goto out; /* ENOSPC and fdblks_delta = 0 */
 717
 718                 delta = request - mp->m_resblks;
 719                 lcounter = free - delta;
 720                 if (lcounter < 0) {
 721                         /* We can't satisfy the request, just get what we can */
 722                         mp->m_resblks += free;
 723                         mp->m_resblks_avail += free;
 724                         fdblks_delta = -free;
 725                 } else {
 726                         fdblks_delta = -delta;
 727                         mp->m_resblks = request;
 728                         mp->m_resblks_avail += delta;
 729                 }
 730         }
 731 out:
 732         if (outval) {
 733                 outval->resblks = mp->m_resblks;
 734                 outval->resblks_avail = mp->m_resblks_avail;
 735         }
 736         spin_unlock(&mp->m_sb_lock);
 737
 738         if (fdblks_delta) {
 739                 /*
 740                  * If we are putting blocks back here, m_resblks_avail is
 741                  * already at its max so this will put it in the free pool.
 742                  *
 743                  * If we need space, we'll either succeed in getting it
 744                  * from the free block count or we'll get an enospc. If
 745                  * we get a ENOSPC, it means things changed while we were
 746                  * calculating fdblks_delta and so we should try again to
 747                  * see if there is anything left to 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                 int error;
 753                 error = xfs_icsb_modify_counters(mp, XFS_SBS_FDBLOCKS,
 754                                                  fdblks_delta, 0);
 755                 if (error == -ENOSPC)
 756                         goto retry;
 757         }
 758         return 0;
 759 }
 760
 761 /*
 762  * Dump a transaction into the log that contains no real change. This is needed
 763  * to be able to make the log dirty or stamp the current tail LSN into the log
 764  * during the covering operation.
 765  *
 766  * We cannot use an inode here for this - that will push dirty state back up
 767  * into the VFS and then periodic inode flushing will prevent log covering from
 768  * making progress. Hence we log a field in the superblock instead and use a
 769  * synchronous transaction to ensure the superblock is immediately unpinned
 770  * and can be written back.
 771  */
 772 int
 773 xfs_fs_log_dummy(
 774         xfs_mount_t     *mp)
 775 {
 776         xfs_trans_t     *tp;
 777         int             error;
 778
 779         tp = _xfs_trans_alloc(mp, XFS_TRANS_DUMMY1, KM_SLEEP);
 780         error = xfs_trans_reserve(tp, &M_RES(mp)->tr_sb, 0, 0);
 781         if (error) {
 782                 xfs_trans_cancel(tp, 0);
 783                 return error;
 784         }
 785
 786         /* log the UUID because it is an unchanging field */
 787         xfs_mod_sb(tp, XFS_SB_UUID);
 788         xfs_trans_set_sync(tp);
 789         return xfs_trans_commit(tp, 0);
 790 }
 791
 792 int
 793 xfs_fs_goingdown(
 794         xfs_mount_t     *mp,
 795         __uint32_t      inflags)
 796 {
 797         switch (inflags) {
 798         case XFS_FSOP_GOING_FLAGS_DEFAULT: {
 799                 struct super_block *sb = freeze_bdev(mp->m_super->s_bdev);
 800
 801                 if (sb && !IS_ERR(sb)) {
 802                         xfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT);
 803                         thaw_bdev(sb->s_bdev, sb);
 804                 }
 805
 806                 break;
 807         }
 808         case XFS_FSOP_GOING_FLAGS_LOGFLUSH:
 809                 xfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT);
 810                 break;
 811         case XFS_FSOP_GOING_FLAGS_NOLOGFLUSH:
 812                 xfs_force_shutdown(mp,
 813                                 SHUTDOWN_FORCE_UMOUNT | SHUTDOWN_LOG_IO_ERROR);
 814                 break;
 815         default:
 816                 return -EINVAL;
 817         }
 818
 819         return 0;
 820 }
 821
 822 /*
 823  * Force a shutdown of the filesystem instantly while keeping the filesystem
 824  * consistent. We don't do an unmount here; just shutdown the shop, make sure
 825  * that absolutely nothing persistent happens to this filesystem after this
 826  * point.
 827  */
 828 void
 829 xfs_do_force_shutdown(
 830         xfs_mount_t     *mp,
 831         int             flags,
 832         char            *fname,
 833         int             lnnum)
 834 {
 835         int             logerror;
 836
 837         logerror = flags & SHUTDOWN_LOG_IO_ERROR;
 838
 839         if (!(flags & SHUTDOWN_FORCE_UMOUNT)) {
 840                 xfs_notice(mp,
 841         "%s(0x%x) called from line %d of file %s.  Return address = 0x%p",
 842                         __func__, flags, lnnum, fname, __return_address);
 843         }
 844         /*
 845          * No need to duplicate efforts.
 846          */
 847         if (XFS_FORCED_SHUTDOWN(mp) && !logerror)
 848                 return;
 849
 850         /*
 851          * This flags XFS_MOUNT_FS_SHUTDOWN, makes sure that we don't
 852          * queue up anybody new on the log reservations, and wakes up
 853          * everybody who's sleeping on log reservations to tell them
 854          * the bad news.
 855          */
 856         if (xfs_log_force_umount(mp, logerror))
 857                 return;
 858
 859         if (flags & SHUTDOWN_CORRUPT_INCORE) {
 860                 xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_CORRUPT,
 861     "Corruption of in-memory data detected.  Shutting down filesystem");
 862                 if (XFS_ERRLEVEL_HIGH <= xfs_error_level)
 863                         xfs_stack_trace();
 864         } else if (!(flags & SHUTDOWN_FORCE_UMOUNT)) {
 865                 if (logerror) {
 866                         xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_LOGERROR,
 867                 "Log I/O Error Detected.  Shutting down filesystem");
 868                 } else if (flags & SHUTDOWN_DEVICE_REQ) {
 869                         xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_IOERROR,
 870                 "All device paths lost.  Shutting down filesystem");
 871                 } else if (!(flags & SHUTDOWN_REMOTE_REQ)) {
 872                         xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_IOERROR,
 873                 "I/O Error Detected. Shutting down filesystem");
 874                 }
 875         }
 876         if (!(flags & SHUTDOWN_FORCE_UMOUNT)) {
 877                 xfs_alert(mp,
 878         "Please umount the filesystem and rectify the problem(s)");
 879         }
 880 }