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_inode.h"
  28 #include "xfs_trans.h"
  29 #include "xfs_inode_item.h"
  30 #include "xfs_error.h"
  31 #include "xfs_btree.h"
  32 #include "xfs_alloc_btree.h"
  33 #include "xfs_alloc.h"
  34 #include "xfs_ialloc.h"
  35 #include "xfs_fsops.h"
  36 #include "xfs_itable.h"
  37 #include "xfs_trans_space.h"
  38 #include "xfs_rtalloc.h"
  39 #include "xfs_trace.h"
  40 #include "xfs_log.h"
  41 #include "xfs_dinode.h"
  42 #include "xfs_filestream.h"
  43
  44 /*
  45  * File system operations
  46  */
  47
  48 int
  49 xfs_fs_geometry(
  50         xfs_mount_t             *mp,
  51         xfs_fsop_geom_t         *geo,
  52         int                     new_version)
  53 {
  54
  55         memset(geo, 0, sizeof(*geo));
  56
  57         geo->blocksize = mp->m_sb.sb_blocksize;
  58         geo->rtextsize = mp->m_sb.sb_rextsize;
  59         geo->agblocks = mp->m_sb.sb_agblocks;
  60         geo->agcount = mp->m_sb.sb_agcount;
  61         geo->logblocks = mp->m_sb.sb_logblocks;
  62         geo->sectsize = mp->m_sb.sb_sectsize;
  63         geo->inodesize = mp->m_sb.sb_inodesize;
  64         geo->imaxpct = mp->m_sb.sb_imax_pct;
  65         geo->datablocks = mp->m_sb.sb_dblocks;
  66         geo->rtblocks = mp->m_sb.sb_rblocks;
  67         geo->rtextents = mp->m_sb.sb_rextents;
  68         geo->logstart = mp->m_sb.sb_logstart;
  69         ASSERT(sizeof(geo->uuid)==sizeof(mp->m_sb.sb_uuid));
  70         memcpy(geo->uuid, &mp->m_sb.sb_uuid, sizeof(mp->m_sb.sb_uuid));
  71         if (new_version >= 2) {
  72                 geo->sunit = mp->m_sb.sb_unit;
  73                 geo->swidth = mp->m_sb.sb_width;
  74         }
  75         if (new_version >= 3) {
  76                 geo->version = XFS_FSOP_GEOM_VERSION;
  77                 geo->flags =
  78                         (xfs_sb_version_hasattr(&mp->m_sb) ?
  79                                 XFS_FSOP_GEOM_FLAGS_ATTR : 0) |
  80                         (xfs_sb_version_hasnlink(&mp->m_sb) ?
  81                                 XFS_FSOP_GEOM_FLAGS_NLINK : 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_hasshared(&mp->m_sb) ?
  89                                 XFS_FSOP_GEOM_FLAGS_SHARED : 0) |
  90                         (xfs_sb_version_hasextflgbit(&mp->m_sb) ?
  91                                 XFS_FSOP_GEOM_FLAGS_EXTFLG : 0) |
  92                         (xfs_sb_version_hasdirv2(&mp->m_sb) ?
  93                                 XFS_FSOP_GEOM_FLAGS_DIRV2 : 0) |
  94                         (xfs_sb_version_hassector(&mp->m_sb) ?
  95                                 XFS_FSOP_GEOM_FLAGS_SECTOR : 0) |
  96                         (xfs_sb_version_hasasciici(&mp->m_sb) ?
  97                                 XFS_FSOP_GEOM_FLAGS_DIRV2CI : 0) |
  98                         (xfs_sb_version_haslazysbcount(&mp->m_sb) ?
  99                                 XFS_FSOP_GEOM_FLAGS_LAZYSB : 0) |
 100                         (xfs_sb_version_hasattr2(&mp->m_sb) ?
 101                                 XFS_FSOP_GEOM_FLAGS_ATTR2 : 0) |
 102                         (xfs_sb_version_hasprojid32bit(&mp->m_sb) ?
 103                                 XFS_FSOP_GEOM_FLAGS_PROJID32 : 0) |
 104                         (xfs_sb_version_hascrc(&mp->m_sb) ?
 105                                 XFS_FSOP_GEOM_FLAGS_V5SB : 0) |
 106                         (xfs_sb_version_hasftype(&mp->m_sb) ?
 107                                 XFS_FSOP_GEOM_FLAGS_FTYPE : 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_dirblksize;
 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 XFS_ERROR(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         bp = 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, NULL);
 179         if (!bp)
 180                 return EIO;
 181         if (bp->b_error) {
 182                 error = bp->b_error;
 183                 xfs_buf_relse(bp);
 184                 return error;
 185         }
 186         xfs_buf_relse(bp);
 187
 188         new = nb;       /* use new as a temporary here */
 189         nb_mod = do_div(new, mp->m_sb.sb_agblocks);
 190         nagcount = new + (nb_mod != 0);
 191         if (nb_mod && nb_mod < XFS_MIN_AG_BLOCKS) {
 192                 nagcount--;
 193                 nb = (xfs_rfsblock_t)nagcount * mp->m_sb.sb_agblocks;
 194                 if (nb < mp->m_sb.sb_dblocks)
 195                         return XFS_ERROR(EINVAL);
 196         }
 197         new = nb - mp->m_sb.sb_dblocks;
 198         oagcount = mp->m_sb.sb_agcount;
 199
 200         /* allocate the new per-ag structures */
 201         if (nagcount > oagcount) {
 202                 error = xfs_initialize_perag(mp, nagcount, &nagimax);
 203                 if (error)
 204                         return error;
 205         }
 206
 207         tp = xfs_trans_alloc(mp, XFS_TRANS_GROWFS);
 208         tp->t_flags |= XFS_TRANS_RESERVE;
 209         error = xfs_trans_reserve(tp, &M_RES(mp)->tr_growdata,
 210                                   XFS_GROWFS_SPACE_RES(mp), 0);
 211         if (error) {
 212                 xfs_trans_cancel(tp, 0);
 213                 return error;
 214         }
 215
 216         /*
 217          * Write new AG headers to disk. Non-transactional, but written
 218          * synchronously so they are completed prior to the growfs transaction
 219          * being logged.
 220          */
 221         nfree = 0;
 222         for (agno = nagcount - 1; agno >= oagcount; agno--, new -= agsize) {
 223                 __be32  *agfl_bno;
 224
 225                 /*
 226                  * AG freespace header block
 227                  */
 228                 bp = xfs_growfs_get_hdr_buf(mp,
 229                                 XFS_AG_DADDR(mp, agno, XFS_AGF_DADDR(mp)),
 230                                 XFS_FSS_TO_BB(mp, 1), 0,
 231                                 &xfs_agf_buf_ops);
 232                 if (!bp) {
 233                         error = ENOMEM;
 234                         goto error0;
 235                 }
 236
 237                 agf = XFS_BUF_TO_AGF(bp);
 238                 agf->agf_magicnum = cpu_to_be32(XFS_AGF_MAGIC);
 239                 agf->agf_versionnum = cpu_to_be32(XFS_AGF_VERSION);
 240                 agf->agf_seqno = cpu_to_be32(agno);
 241                 if (agno == nagcount - 1)
 242                         agsize =
 243                                 nb -
 244                                 (agno * (xfs_rfsblock_t)mp->m_sb.sb_agblocks);
 245                 else
 246                         agsize = mp->m_sb.sb_agblocks;
 247                 agf->agf_length = cpu_to_be32(agsize);
 248                 agf->agf_roots[XFS_BTNUM_BNOi] = cpu_to_be32(XFS_BNO_BLOCK(mp));
 249                 agf->agf_roots[XFS_BTNUM_CNTi] = cpu_to_be32(XFS_CNT_BLOCK(mp));
 250                 agf->agf_levels[XFS_BTNUM_BNOi] = cpu_to_be32(1);
 251                 agf->agf_levels[XFS_BTNUM_CNTi] = cpu_to_be32(1);
 252                 agf->agf_flfirst = 0;
 253                 agf->agf_fllast = cpu_to_be32(XFS_AGFL_SIZE(mp) - 1);
 254                 agf->agf_flcount = 0;
 255                 tmpsize = agsize - XFS_PREALLOC_BLOCKS(mp);
 256                 agf->agf_freeblks = cpu_to_be32(tmpsize);
 257                 agf->agf_longest = cpu_to_be32(tmpsize);
 258                 if (xfs_sb_version_hascrc(&mp->m_sb))
 259                         uuid_copy(&agf->agf_uuid, &mp->m_sb.sb_uuid);
 260
 261                 error = xfs_bwrite(bp);
 262                 xfs_buf_relse(bp);
 263                 if (error)
 264                         goto error0;
 265
 266                 /*
 267                  * AG freelist header block
 268                  */
 269                 bp = xfs_growfs_get_hdr_buf(mp,
 270                                 XFS_AG_DADDR(mp, agno, XFS_AGFL_DADDR(mp)),
 271                                 XFS_FSS_TO_BB(mp, 1), 0,
 272                                 &xfs_agfl_buf_ops);
 273                 if (!bp) {
 274                         error = ENOMEM;
 275                         goto error0;
 276                 }
 277
 278                 agfl = XFS_BUF_TO_AGFL(bp);
 279                 if (xfs_sb_version_hascrc(&mp->m_sb)) {
 280                         agfl->agfl_magicnum = cpu_to_be32(XFS_AGFL_MAGIC);
 281                         agfl->agfl_seqno = cpu_to_be32(agno);
 282                         uuid_copy(&agfl->agfl_uuid, &mp->m_sb.sb_uuid);
 283                 }
 284
 285                 agfl_bno = XFS_BUF_TO_AGFL_BNO(mp, bp);
 286                 for (bucket = 0; bucket < XFS_AGFL_SIZE(mp); bucket++)
 287                         agfl_bno[bucket] = cpu_to_be32(NULLAGBLOCK);
 288
 289                 error = xfs_bwrite(bp);
 290                 xfs_buf_relse(bp);
 291                 if (error)
 292                         goto error0;
 293
 294                 /*
 295                  * AG inode header block
 296                  */
 297                 bp = xfs_growfs_get_hdr_buf(mp,
 298                                 XFS_AG_DADDR(mp, agno, XFS_AGI_DADDR(mp)),
 299                                 XFS_FSS_TO_BB(mp, 1), 0,
 300                                 &xfs_agi_buf_ops);
 301                 if (!bp) {
 302                         error = ENOMEM;
 303                         goto error0;
 304                 }
 305
 306                 agi = XFS_BUF_TO_AGI(bp);
 307                 agi->agi_magicnum = cpu_to_be32(XFS_AGI_MAGIC);
 308                 agi->agi_versionnum = cpu_to_be32(XFS_AGI_VERSION);
 309                 agi->agi_seqno = cpu_to_be32(agno);
 310                 agi->agi_length = cpu_to_be32(agsize);
 311                 agi->agi_count = 0;
 312                 agi->agi_root = cpu_to_be32(XFS_IBT_BLOCK(mp));
 313                 agi->agi_level = cpu_to_be32(1);
 314                 agi->agi_freecount = 0;
 315                 agi->agi_newino = cpu_to_be32(NULLAGINO);
 316                 agi->agi_dirino = cpu_to_be32(NULLAGINO);
 317                 if (xfs_sb_version_hascrc(&mp->m_sb))
 318                         uuid_copy(&agi->agi_uuid, &mp->m_sb.sb_uuid);
 319                 for (bucket = 0; bucket < XFS_AGI_UNLINKED_BUCKETS; bucket++)
 320                         agi->agi_unlinked[bucket] = cpu_to_be32(NULLAGINO);
 321
 322                 error = xfs_bwrite(bp);
 323                 xfs_buf_relse(bp);
 324                 if (error)
 325                         goto error0;
 326
 327                 /*
 328                  * BNO btree root block
 329                  */
 330                 bp = xfs_growfs_get_hdr_buf(mp,
 331                                 XFS_AGB_TO_DADDR(mp, agno, XFS_BNO_BLOCK(mp)),
 332                                 BTOBB(mp->m_sb.sb_blocksize), 0,
 333                                 &xfs_allocbt_buf_ops);
 334
 335                 if (!bp) {
 336                         error = ENOMEM;
 337                         goto error0;
 338                 }
 339
 340                 if (xfs_sb_version_hascrc(&mp->m_sb))
 341                         xfs_btree_init_block(mp, bp, XFS_ABTB_CRC_MAGIC, 0, 1,
 342                                                 agno, XFS_BTREE_CRC_BLOCKS);
 343                 else
 344                         xfs_btree_init_block(mp, bp, XFS_ABTB_MAGIC, 0, 1,
 345                                                 agno, 0);
 346
 347                 arec = XFS_ALLOC_REC_ADDR(mp, XFS_BUF_TO_BLOCK(bp), 1);
 348                 arec->ar_startblock = cpu_to_be32(XFS_PREALLOC_BLOCKS(mp));
 349                 arec->ar_blockcount = cpu_to_be32(
 350                         agsize - be32_to_cpu(arec->ar_startblock));
 351
 352                 error = xfs_bwrite(bp);
 353                 xfs_buf_relse(bp);
 354                 if (error)
 355                         goto error0;
 356
 357                 /*
 358                  * CNT btree root block
 359                  */
 360                 bp = xfs_growfs_get_hdr_buf(mp,
 361                                 XFS_AGB_TO_DADDR(mp, agno, XFS_CNT_BLOCK(mp)),
 362                                 BTOBB(mp->m_sb.sb_blocksize), 0,
 363                                 &xfs_allocbt_buf_ops);
 364                 if (!bp) {
 365                         error = ENOMEM;
 366                         goto error0;
 367                 }
 368
 369                 if (xfs_sb_version_hascrc(&mp->m_sb))
 370                         xfs_btree_init_block(mp, bp, XFS_ABTC_CRC_MAGIC, 0, 1,
 371                                                 agno, XFS_BTREE_CRC_BLOCKS);
 372                 else
 373                         xfs_btree_init_block(mp, bp, XFS_ABTC_MAGIC, 0, 1,
 374                                                 agno, 0);
 375
 376                 arec = XFS_ALLOC_REC_ADDR(mp, XFS_BUF_TO_BLOCK(bp), 1);
 377                 arec->ar_startblock = cpu_to_be32(XFS_PREALLOC_BLOCKS(mp));
 378                 arec->ar_blockcount = cpu_to_be32(
 379                         agsize - be32_to_cpu(arec->ar_startblock));
 380                 nfree += be32_to_cpu(arec->ar_blockcount);
 381
 382                 error = xfs_bwrite(bp);
 383                 xfs_buf_relse(bp);
 384                 if (error)
 385                         goto error0;
 386
 387                 /*
 388                  * INO btree root block
 389                  */
 390                 bp = xfs_growfs_get_hdr_buf(mp,
 391                                 XFS_AGB_TO_DADDR(mp, agno, XFS_IBT_BLOCK(mp)),
 392                                 BTOBB(mp->m_sb.sb_blocksize), 0,
 393                                 &xfs_inobt_buf_ops);
 394                 if (!bp) {
 395                         error = ENOMEM;
 396                         goto error0;
 397                 }
 398
 399                 if (xfs_sb_version_hascrc(&mp->m_sb))
 400                         xfs_btree_init_block(mp, bp, XFS_IBT_CRC_MAGIC, 0, 0,
 401                                                 agno, XFS_BTREE_CRC_BLOCKS);
 402                 else
 403                         xfs_btree_init_block(mp, bp, XFS_IBT_MAGIC, 0, 0,
 404                                                 agno, 0);
 405
 406                 error = xfs_bwrite(bp);
 407                 xfs_buf_relse(bp);
 408                 if (error)
 409                         goto error0;
 410         }
 411         xfs_trans_agblocks_delta(tp, nfree);
 412         /*
 413          * There are new blocks in the old last a.g.
 414          */
 415         if (new) {
 416                 /*
 417                  * Change the agi length.
 418                  */
 419                 error = xfs_ialloc_read_agi(mp, tp, agno, &bp);
 420                 if (error) {
 421                         goto error0;
 422                 }
 423                 ASSERT(bp);
 424                 agi = XFS_BUF_TO_AGI(bp);
 425                 be32_add_cpu(&agi->agi_length, new);
 426                 ASSERT(nagcount == oagcount ||
 427                        be32_to_cpu(agi->agi_length) == mp->m_sb.sb_agblocks);
 428                 xfs_ialloc_log_agi(tp, bp, XFS_AGI_LENGTH);
 429                 /*
 430                  * Change agf length.
 431                  */
 432                 error = xfs_alloc_read_agf(mp, tp, agno, 0, &bp);
 433                 if (error) {
 434                         goto error0;
 435                 }
 436                 ASSERT(bp);
 437                 agf = XFS_BUF_TO_AGF(bp);
 438                 be32_add_cpu(&agf->agf_length, new);
 439                 ASSERT(be32_to_cpu(agf->agf_length) ==
 440                        be32_to_cpu(agi->agi_length));
 441
 442                 xfs_alloc_log_agf(tp, bp, XFS_AGF_LENGTH);
 443                 /*
 444                  * Free the new space.
 445                  */
 446                 error = xfs_free_extent(tp, XFS_AGB_TO_FSB(mp, agno,
 447                         be32_to_cpu(agf->agf_length) - new), new);
 448                 if (error) {
 449                         goto error0;
 450                 }
 451         }
 452
 453         /*
 454          * Update changed superblock fields transactionally. These are not
 455          * seen by the rest of the world until the transaction commit applies
 456          * them atomically to the superblock.
 457          */
 458         if (nagcount > oagcount)
 459                 xfs_trans_mod_sb(tp, XFS_TRANS_SB_AGCOUNT, nagcount - oagcount);
 460         if (nb > mp->m_sb.sb_dblocks)
 461                 xfs_trans_mod_sb(tp, XFS_TRANS_SB_DBLOCKS,
 462                                  nb - mp->m_sb.sb_dblocks);
 463         if (nfree)
 464                 xfs_trans_mod_sb(tp, XFS_TRANS_SB_FDBLOCKS, nfree);
 465         if (dpct)
 466                 xfs_trans_mod_sb(tp, XFS_TRANS_SB_IMAXPCT, dpct);
 467         error = xfs_trans_commit(tp, 0);
 468         if (error)
 469                 return error;
 470
 471         /* New allocation groups fully initialized, so update mount struct */
 472         if (nagimax)
 473                 mp->m_maxagi = nagimax;
 474         if (mp->m_sb.sb_imax_pct) {
 475                 __uint64_t icount = mp->m_sb.sb_dblocks * mp->m_sb.sb_imax_pct;
 476                 do_div(icount, 100);
 477                 mp->m_maxicount = icount << mp->m_sb.sb_inopblog;
 478         } else
 479                 mp->m_maxicount = 0;
 480         xfs_set_low_space_thresholds(mp);
 481
 482         /* update secondary superblocks. */
 483         for (agno = 1; agno < nagcount; agno++) {
 484                 error = 0;
 485                 /*
 486                  * new secondary superblocks need to be zeroed, not read from
 487                  * disk as the contents of the new area we are growing into is
 488                  * completely unknown.
 489                  */
 490                 if (agno < oagcount) {
 491                         error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp,
 492                                   XFS_AGB_TO_DADDR(mp, agno, XFS_SB_BLOCK(mp)),
 493                                   XFS_FSS_TO_BB(mp, 1), 0, &bp,
 494                                   &xfs_sb_buf_ops);
 495                 } else {
 496                         bp = xfs_trans_get_buf(NULL, mp->m_ddev_targp,
 497                                   XFS_AGB_TO_DADDR(mp, agno, XFS_SB_BLOCK(mp)),
 498                                   XFS_FSS_TO_BB(mp, 1), 0);
 499                         if (bp) {
 500                                 bp->b_ops = &xfs_sb_buf_ops;
 501                                 xfs_buf_zero(bp, 0, BBTOB(bp->b_length));
 502                         } else
 503                                 error = ENOMEM;
 504                 }
 505
 506                 /*
 507                  * If we get an error reading or writing alternate superblocks,
 508                  * continue.  xfs_repair chooses the "best" superblock based
 509                  * on most matches; if we break early, we'll leave more
 510                  * superblocks un-updated than updated, and xfs_repair may
 511                  * pick them over the properly-updated primary.
 512                  */
 513                 if (error) {
 514                         xfs_warn(mp,
 515                 "error %d reading secondary superblock for ag %d",
 516                                 error, agno);
 517                         saved_error = error;
 518                         continue;
 519                 }
 520                 xfs_sb_to_disk(XFS_BUF_TO_SBP(bp), &mp->m_sb, XFS_SB_ALL_BITS);
 521
 522                 error = xfs_bwrite(bp);
 523                 xfs_buf_relse(bp);
 524                 if (error) {
 525                         xfs_warn(mp,
 526                 "write error %d updating secondary superblock for ag %d",
 527                                 error, agno);
 528                         saved_error = error;
 529                         continue;
 530                 }
 531         }
 532         return saved_error ? saved_error : error;
 533
 534  error0:
 535         xfs_trans_cancel(tp, XFS_TRANS_ABORT);
 536         return error;
 537 }
 538
 539 static int
 540 xfs_growfs_log_private(
 541         xfs_mount_t             *mp,    /* mount point for filesystem */
 542         xfs_growfs_log_t        *in)    /* growfs log input struct */
 543 {
 544         xfs_extlen_t            nb;
 545
 546         nb = in->newblocks;
 547         if (nb < XFS_MIN_LOG_BLOCKS || nb < XFS_B_TO_FSB(mp, XFS_MIN_LOG_BYTES))
 548                 return XFS_ERROR(EINVAL);
 549         if (nb == mp->m_sb.sb_logblocks &&
 550             in->isint == (mp->m_sb.sb_logstart != 0))
 551                 return XFS_ERROR(EINVAL);
 552         /*
 553          * Moving the log is hard, need new interfaces to sync
 554          * the log first, hold off all activity while moving it.
 555          * Can have shorter or longer log in the same space,
 556          * or transform internal to external log or vice versa.
 557          */
 558         return XFS_ERROR(ENOSYS);
 559 }
 560
 561 /*
 562  * protected versions of growfs function acquire and release locks on the mount
 563  * point - exported through ioctls: XFS_IOC_FSGROWFSDATA, XFS_IOC_FSGROWFSLOG,
 564  * XFS_IOC_FSGROWFSRT
 565  */
 566
 567
 568 int
 569 xfs_growfs_data(
 570         xfs_mount_t             *mp,
 571         xfs_growfs_data_t       *in)
 572 {
 573         int error;
 574
 575         if (!capable(CAP_SYS_ADMIN))
 576                 return XFS_ERROR(EPERM);
 577         if (!mutex_trylock(&mp->m_growlock))
 578                 return XFS_ERROR(EWOULDBLOCK);
 579         error = xfs_growfs_data_private(mp, in);
 580         mutex_unlock(&mp->m_growlock);
 581         return error;
 582 }
 583
 584 int
 585 xfs_growfs_log(
 586         xfs_mount_t             *mp,
 587         xfs_growfs_log_t        *in)
 588 {
 589         int error;
 590
 591         if (!capable(CAP_SYS_ADMIN))
 592                 return XFS_ERROR(EPERM);
 593         if (!mutex_trylock(&mp->m_growlock))
 594                 return XFS_ERROR(EWOULDBLOCK);
 595         error = xfs_growfs_log_private(mp, in);
 596         mutex_unlock(&mp->m_growlock);
 597         return error;
 598 }
 599
 600 /*
 601  * exported through ioctl XFS_IOC_FSCOUNTS
 602  */
 603
 604 int
 605 xfs_fs_counts(
 606         xfs_mount_t             *mp,
 607         xfs_fsop_counts_t       *cnt)
 608 {
 609         xfs_icsb_sync_counters(mp, XFS_ICSB_LAZY_COUNT);
 610         spin_lock(&mp->m_sb_lock);
 611         cnt->freedata = mp->m_sb.sb_fdblocks - XFS_ALLOC_SET_ASIDE(mp);
 612         cnt->freertx = mp->m_sb.sb_frextents;
 613         cnt->freeino = mp->m_sb.sb_ifree;
 614         cnt->allocino = mp->m_sb.sb_icount;
 615         spin_unlock(&mp->m_sb_lock);
 616         return 0;
 617 }
 618
 619 /*
 620  * exported through ioctl XFS_IOC_SET_RESBLKS & XFS_IOC_GET_RESBLKS
 621  *
 622  * xfs_reserve_blocks is called to set m_resblks
 623  * in the in-core mount table. The number of unused reserved blocks
 624  * is kept in m_resblks_avail.
 625  *
 626  * Reserve the requested number of blocks if available. Otherwise return
 627  * as many as possible to satisfy the request. The actual number
 628  * reserved are returned in outval
 629  *
 630  * A null inval pointer indicates that only the current reserved blocks
 631  * available  should  be returned no settings are changed.
 632  */
 633
 634 int
 635 xfs_reserve_blocks(
 636         xfs_mount_t             *mp,
 637         __uint64_t              *inval,
 638         xfs_fsop_resblks_t      *outval)
 639 {
 640         __int64_t               lcounter, delta, fdblks_delta;
 641         __uint64_t              request;
 642
 643         /* If inval is null, report current values and return */
 644         if (inval == (__uint64_t *)NULL) {
 645                 if (!outval)
 646                         return EINVAL;
 647                 outval->resblks = mp->m_resblks;
 648                 outval->resblks_avail = mp->m_resblks_avail;
 649                 return 0;
 650         }
 651
 652         request = *inval;
 653
 654         /*
 655          * With per-cpu counters, this becomes an interesting
 656          * problem. we needto work out if we are freeing or allocation
 657          * blocks first, then we can do the modification as necessary.
 658          *
 659          * We do this under the m_sb_lock so that if we are near
 660          * ENOSPC, we will hold out any changes while we work out
 661          * what to do. This means that the amount of free space can
 662          * change while we do this, so we need to retry if we end up
 663          * trying to reserve more space than is available.
 664          *
 665          * We also use the xfs_mod_incore_sb() interface so that we
 666          * don't have to care about whether per cpu counter are
 667          * enabled, disabled or even compiled in....
 668          */
 669 retry:
 670         spin_lock(&mp->m_sb_lock);
 671         xfs_icsb_sync_counters_locked(mp, 0);
 672
 673         /*
 674          * If our previous reservation was larger than the current value,
 675          * then move any unused blocks back to the free pool.
 676          */
 677         fdblks_delta = 0;
 678         if (mp->m_resblks > request) {
 679                 lcounter = mp->m_resblks_avail - request;
 680                 if (lcounter  > 0) {            /* release unused blocks */
 681                         fdblks_delta = lcounter;
 682                         mp->m_resblks_avail -= lcounter;
 683                 }
 684                 mp->m_resblks = request;
 685         } else {
 686                 __int64_t       free;
 687
 688                 free =  mp->m_sb.sb_fdblocks - XFS_ALLOC_SET_ASIDE(mp);
 689                 if (!free)
 690                         goto out; /* ENOSPC and fdblks_delta = 0 */
 691
 692                 delta = request - mp->m_resblks;
 693                 lcounter = free - delta;
 694                 if (lcounter < 0) {
 695                         /* We can't satisfy the request, just get what we can */
 696                         mp->m_resblks += free;
 697                         mp->m_resblks_avail += free;
 698                         fdblks_delta = -free;
 699                 } else {
 700                         fdblks_delta = -delta;
 701                         mp->m_resblks = request;
 702                         mp->m_resblks_avail += delta;
 703                 }
 704         }
 705 out:
 706         if (outval) {
 707                 outval->resblks = mp->m_resblks;
 708                 outval->resblks_avail = mp->m_resblks_avail;
 709         }
 710         spin_unlock(&mp->m_sb_lock);
 711
 712         if (fdblks_delta) {
 713                 /*
 714                  * If we are putting blocks back here, m_resblks_avail is
 715                  * already at its max so this will put it in the free pool.
 716                  *
 717                  * If we need space, we'll either succeed in getting it
 718                  * from the free block count or we'll get an enospc. If
 719                  * we get a ENOSPC, it means things changed while we were
 720                  * calculating fdblks_delta and so we should try again to
 721                  * see if there is anything left to reserve.
 722                  *
 723                  * Don't set the reserved flag here - we don't want to reserve
 724                  * the extra reserve blocks from the reserve.....
 725                  */
 726                 int error;
 727                 error = xfs_icsb_modify_counters(mp, XFS_SBS_FDBLOCKS,
 728                                                  fdblks_delta, 0);
 729                 if (error == ENOSPC)
 730                         goto retry;
 731         }
 732         return 0;
 733 }
 734
 735 /*
 736  * Dump a transaction into the log that contains no real change. This is needed
 737  * to be able to make the log dirty or stamp the current tail LSN into the log
 738  * during the covering operation.
 739  *
 740  * We cannot use an inode here for this - that will push dirty state back up
 741  * into the VFS and then periodic inode flushing will prevent log covering from
 742  * making progress. Hence we log a field in the superblock instead and use a
 743  * synchronous transaction to ensure the superblock is immediately unpinned
 744  * and can be written back.
 745  */
 746 int
 747 xfs_fs_log_dummy(
 748         xfs_mount_t     *mp)
 749 {
 750         xfs_trans_t     *tp;
 751         int             error;
 752
 753         tp = _xfs_trans_alloc(mp, XFS_TRANS_DUMMY1, KM_SLEEP);
 754         error = xfs_trans_reserve(tp, &M_RES(mp)->tr_sb, 0, 0);
 755         if (error) {
 756                 xfs_trans_cancel(tp, 0);
 757                 return error;
 758         }
 759
 760         /* log the UUID because it is an unchanging field */
 761         xfs_mod_sb(tp, XFS_SB_UUID);
 762         xfs_trans_set_sync(tp);
 763         return xfs_trans_commit(tp, 0);
 764 }
 765
 766 int
 767 xfs_fs_goingdown(
 768         xfs_mount_t     *mp,
 769         __uint32_t      inflags)
 770 {
 771         switch (inflags) {
 772         case XFS_FSOP_GOING_FLAGS_DEFAULT: {
 773                 struct super_block *sb = freeze_bdev(mp->m_super->s_bdev);
 774
 775                 if (sb && !IS_ERR(sb)) {
 776                         xfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT);
 777                         thaw_bdev(sb->s_bdev, sb);
 778                 }
 779
 780                 break;
 781         }
 782         case XFS_FSOP_GOING_FLAGS_LOGFLUSH:
 783                 xfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT);
 784                 break;
 785         case XFS_FSOP_GOING_FLAGS_NOLOGFLUSH:
 786                 xfs_force_shutdown(mp,
 787                                 SHUTDOWN_FORCE_UMOUNT | SHUTDOWN_LOG_IO_ERROR);
 788                 break;
 789         default:
 790                 return XFS_ERROR(EINVAL);
 791         }
 792
 793         return 0;
 794 }
 795
 796 /*
 797  * Force a shutdown of the filesystem instantly while keeping the filesystem
 798  * consistent. We don't do an unmount here; just shutdown the shop, make sure
 799  * that absolutely nothing persistent happens to this filesystem after this
 800  * point.
 801  */
 802 void
 803 xfs_do_force_shutdown(
 804         xfs_mount_t     *mp,
 805         int             flags,
 806         char            *fname,
 807         int             lnnum)
 808 {
 809         int             logerror;
 810
 811         logerror = flags & SHUTDOWN_LOG_IO_ERROR;
 812
 813         if (!(flags & SHUTDOWN_FORCE_UMOUNT)) {
 814                 xfs_notice(mp,
 815         "%s(0x%x) called from line %d of file %s.  Return address = 0x%p",
 816                         __func__, flags, lnnum, fname, __return_address);
 817         }
 818         /*
 819          * No need to duplicate efforts.
 820          */
 821         if (XFS_FORCED_SHUTDOWN(mp) && !logerror)
 822                 return;
 823
 824         /*
 825          * This flags XFS_MOUNT_FS_SHUTDOWN, makes sure that we don't
 826          * queue up anybody new on the log reservations, and wakes up
 827          * everybody who's sleeping on log reservations to tell them
 828          * the bad news.
 829          */
 830         if (xfs_log_force_umount(mp, logerror))
 831                 return;
 832
 833         if (flags & SHUTDOWN_CORRUPT_INCORE) {
 834                 xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_CORRUPT,
 835     "Corruption of in-memory data detected.  Shutting down filesystem");
 836                 if (XFS_ERRLEVEL_HIGH <= xfs_error_level)
 837                         xfs_stack_trace();
 838         } else if (!(flags & SHUTDOWN_FORCE_UMOUNT)) {
 839                 if (logerror) {
 840                         xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_LOGERROR,
 841                 "Log I/O Error Detected.  Shutting down filesystem");
 842                 } else if (flags & SHUTDOWN_DEVICE_REQ) {
 843                         xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_IOERROR,
 844                 "All device paths lost.  Shutting down filesystem");
 845                 } else if (!(flags & SHUTDOWN_REMOTE_REQ)) {
 846                         xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_IOERROR,
 847                 "I/O Error Detected. Shutting down filesystem");
 848                 }
 849         }
 850         if (!(flags & SHUTDOWN_FORCE_UMOUNT)) {
 851                 xfs_alert(mp,
 852         "Please umount the filesystem and rectify the problem(s)");
 853         }
 854 }