fs/xfs/xfs_fsops.c

   1 /*
   2  * Copyright (c) 2000-2005 Silicon Graphics, Inc.
   3  * All Rights Reserved.
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it would be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write the Free Software Foundation,
  16  * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  17  */
  18 #include "xfs.h"
  19 #include "xfs_fs.h"
  20 #include "xfs_shared.h"
  21 #include "xfs_format.h"
  22 #include "xfs_log_format.h"
  23 #include "xfs_trans_resv.h"
  24 #include "xfs_sb.h"
  25 #include "xfs_mount.h"
  26 #include "xfs_da_format.h"
  27 #include "xfs_da_btree.h"
  28 #include "xfs_inode.h"
  29 #include "xfs_trans.h"
  30 #include "xfs_inode_item.h"
  31 #include "xfs_error.h"
  32 #include "xfs_btree.h"
  33 #include "xfs_alloc_btree.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_trace.h"
  41 #include "xfs_log.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 = XFS_FSOP_GEOM_FLAGS_NLINK |
  78                              XFS_FSOP_GEOM_FLAGS_DIRV2 |
  79                         (xfs_sb_version_hasattr(&mp->m_sb) ?
  80                                 XFS_FSOP_GEOM_FLAGS_ATTR : 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_hasextflgbit(&mp->m_sb) ?
  88                                 XFS_FSOP_GEOM_FLAGS_EXTFLG : 0) |
  89                         (xfs_sb_version_hassector(&mp->m_sb) ?
  90                                 XFS_FSOP_GEOM_FLAGS_SECTOR : 0) |
  91                         (xfs_sb_version_hasasciici(&mp->m_sb) ?
  92                                 XFS_FSOP_GEOM_FLAGS_DIRV2CI : 0) |
  93                         (xfs_sb_version_haslazysbcount(&mp->m_sb) ?
  94                                 XFS_FSOP_GEOM_FLAGS_LAZYSB : 0) |
  95                         (xfs_sb_version_hasattr2(&mp->m_sb) ?
  96                                 XFS_FSOP_GEOM_FLAGS_ATTR2 : 0) |
  97                         (xfs_sb_version_hasprojid32bit(&mp->m_sb) ?
  98                                 XFS_FSOP_GEOM_FLAGS_PROJID32 : 0) |
  99                         (xfs_sb_version_hascrc(&mp->m_sb) ?
 100                                 XFS_FSOP_GEOM_FLAGS_V5SB : 0) |
 101                         (xfs_sb_version_hasftype(&mp->m_sb) ?
 102                                 XFS_FSOP_GEOM_FLAGS_FTYPE : 0) |
 103                         (xfs_sb_version_hasfinobt(&mp->m_sb) ?
 104                                 XFS_FSOP_GEOM_FLAGS_FINOBT : 0) |
 105                         (xfs_sb_version_hassparseinodes(&mp->m_sb) ?
 106                                 XFS_FSOP_GEOM_FLAGS_SPINODES : 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         error = xfs_trans_alloc(mp, &M_RES(mp)->tr_growdata,
 202                         XFS_GROWFS_SPACE_RES(mp), 0, XFS_TRANS_RESERVE, &tp);
 203         if (error)
 204                 return error;
 205
 206         /*
 207          * Write new AG headers to disk. Non-transactional, but written
 208          * synchronously so they are completed prior to the growfs transaction
 209          * being logged.
 210          */
 211         nfree = 0;
 212         for (agno = nagcount - 1; agno >= oagcount; agno--, new -= agsize) {
 213                 __be32  *agfl_bno;
 214
 215                 /*
 216                  * AG freespace header block
 217                  */
 218                 bp = xfs_growfs_get_hdr_buf(mp,
 219                                 XFS_AG_DADDR(mp, agno, XFS_AGF_DADDR(mp)),
 220                                 XFS_FSS_TO_BB(mp, 1), 0,
 221                                 &xfs_agf_buf_ops);
 222                 if (!bp) {
 223                         error = -ENOMEM;
 224                         goto error0;
 225                 }
 226
 227                 agf = XFS_BUF_TO_AGF(bp);
 228                 agf->agf_magicnum = cpu_to_be32(XFS_AGF_MAGIC);
 229                 agf->agf_versionnum = cpu_to_be32(XFS_AGF_VERSION);
 230                 agf->agf_seqno = cpu_to_be32(agno);
 231                 if (agno == nagcount - 1)
 232                         agsize =
 233                                 nb -
 234                                 (agno * (xfs_rfsblock_t)mp->m_sb.sb_agblocks);
 235                 else
 236                         agsize = mp->m_sb.sb_agblocks;
 237                 agf->agf_length = cpu_to_be32(agsize);
 238                 agf->agf_roots[XFS_BTNUM_BNOi] = cpu_to_be32(XFS_BNO_BLOCK(mp));
 239                 agf->agf_roots[XFS_BTNUM_CNTi] = cpu_to_be32(XFS_CNT_BLOCK(mp));
 240                 agf->agf_levels[XFS_BTNUM_BNOi] = cpu_to_be32(1);
 241                 agf->agf_levels[XFS_BTNUM_CNTi] = cpu_to_be32(1);
 242                 agf->agf_flfirst = cpu_to_be32(1);
 243                 agf->agf_fllast = 0;
 244                 agf->agf_flcount = 0;
 245                 tmpsize = agsize - XFS_PREALLOC_BLOCKS(mp);
 246                 agf->agf_freeblks = cpu_to_be32(tmpsize);
 247                 agf->agf_longest = cpu_to_be32(tmpsize);
 248                 if (xfs_sb_version_hascrc(&mp->m_sb))
 249                         uuid_copy(&agf->agf_uuid, &mp->m_sb.sb_meta_uuid);
 250
 251                 error = xfs_bwrite(bp);
 252                 xfs_buf_relse(bp);
 253                 if (error)
 254                         goto error0;
 255
 256                 /*
 257                  * AG freelist header block
 258                  */
 259                 bp = xfs_growfs_get_hdr_buf(mp,
 260                                 XFS_AG_DADDR(mp, agno, XFS_AGFL_DADDR(mp)),
 261                                 XFS_FSS_TO_BB(mp, 1), 0,
 262                                 &xfs_agfl_buf_ops);
 263                 if (!bp) {
 264                         error = -ENOMEM;
 265                         goto error0;
 266                 }
 267
 268                 agfl = XFS_BUF_TO_AGFL(bp);
 269                 if (xfs_sb_version_hascrc(&mp->m_sb)) {
 270                         agfl->agfl_magicnum = cpu_to_be32(XFS_AGFL_MAGIC);
 271                         agfl->agfl_seqno = cpu_to_be32(agno);
 272                         uuid_copy(&agfl->agfl_uuid, &mp->m_sb.sb_meta_uuid);
 273                 }
 274
 275                 agfl_bno = XFS_BUF_TO_AGFL_BNO(mp, bp);
 276                 for (bucket = 0; bucket < XFS_AGFL_SIZE(mp); bucket++)
 277                         agfl_bno[bucket] = cpu_to_be32(NULLAGBLOCK);
 278
 279                 error = xfs_bwrite(bp);
 280                 xfs_buf_relse(bp);
 281                 if (error)
 282                         goto error0;
 283
 284                 /*
 285                  * AG inode header block
 286                  */
 287                 bp = xfs_growfs_get_hdr_buf(mp,
 288                                 XFS_AG_DADDR(mp, agno, XFS_AGI_DADDR(mp)),
 289                                 XFS_FSS_TO_BB(mp, 1), 0,
 290                                 &xfs_agi_buf_ops);
 291                 if (!bp) {
 292                         error = -ENOMEM;
 293                         goto error0;
 294                 }
 295
 296                 agi = XFS_BUF_TO_AGI(bp);
 297                 agi->agi_magicnum = cpu_to_be32(XFS_AGI_MAGIC);
 298                 agi->agi_versionnum = cpu_to_be32(XFS_AGI_VERSION);
 299                 agi->agi_seqno = cpu_to_be32(agno);
 300                 agi->agi_length = cpu_to_be32(agsize);
 301                 agi->agi_count = 0;
 302                 agi->agi_root = cpu_to_be32(XFS_IBT_BLOCK(mp));
 303                 agi->agi_level = cpu_to_be32(1);
 304                 agi->agi_freecount = 0;
 305                 agi->agi_newino = cpu_to_be32(NULLAGINO);
 306                 agi->agi_dirino = cpu_to_be32(NULLAGINO);
 307                 if (xfs_sb_version_hascrc(&mp->m_sb))
 308                         uuid_copy(&agi->agi_uuid, &mp->m_sb.sb_meta_uuid);
 309                 if (xfs_sb_version_hasfinobt(&mp->m_sb)) {
 310                         agi->agi_free_root = cpu_to_be32(XFS_FIBT_BLOCK(mp));
 311                         agi->agi_free_level = cpu_to_be32(1);
 312                 }
 313                 for (bucket = 0; bucket < XFS_AGI_UNLINKED_BUCKETS; bucket++)
 314                         agi->agi_unlinked[bucket] = cpu_to_be32(NULLAGINO);
 315
 316                 error = xfs_bwrite(bp);
 317                 xfs_buf_relse(bp);
 318                 if (error)
 319                         goto error0;
 320
 321                 /*
 322                  * BNO btree root block
 323                  */
 324                 bp = xfs_growfs_get_hdr_buf(mp,
 325                                 XFS_AGB_TO_DADDR(mp, agno, XFS_BNO_BLOCK(mp)),
 326                                 BTOBB(mp->m_sb.sb_blocksize), 0,
 327                                 &xfs_allocbt_buf_ops);
 328
 329                 if (!bp) {
 330                         error = -ENOMEM;
 331                         goto error0;
 332                 }
 333
 334                 if (xfs_sb_version_hascrc(&mp->m_sb))
 335                         xfs_btree_init_block(mp, bp, XFS_ABTB_CRC_MAGIC, 0, 1,
 336                                                 agno, XFS_BTREE_CRC_BLOCKS);
 337                 else
 338                         xfs_btree_init_block(mp, bp, XFS_ABTB_MAGIC, 0, 1,
 339                                                 agno, 0);
 340
 341                 arec = XFS_ALLOC_REC_ADDR(mp, XFS_BUF_TO_BLOCK(bp), 1);
 342                 arec->ar_startblock = cpu_to_be32(XFS_PREALLOC_BLOCKS(mp));
 343                 arec->ar_blockcount = cpu_to_be32(
 344                         agsize - be32_to_cpu(arec->ar_startblock));
 345
 346                 error = xfs_bwrite(bp);
 347                 xfs_buf_relse(bp);
 348                 if (error)
 349                         goto error0;
 350
 351                 /*
 352                  * CNT btree root block
 353                  */
 354                 bp = xfs_growfs_get_hdr_buf(mp,
 355                                 XFS_AGB_TO_DADDR(mp, agno, XFS_CNT_BLOCK(mp)),
 356                                 BTOBB(mp->m_sb.sb_blocksize), 0,
 357                                 &xfs_allocbt_buf_ops);
 358                 if (!bp) {
 359                         error = -ENOMEM;
 360                         goto error0;
 361                 }
 362
 363                 if (xfs_sb_version_hascrc(&mp->m_sb))
 364                         xfs_btree_init_block(mp, bp, XFS_ABTC_CRC_MAGIC, 0, 1,
 365                                                 agno, XFS_BTREE_CRC_BLOCKS);
 366                 else
 367                         xfs_btree_init_block(mp, bp, XFS_ABTC_MAGIC, 0, 1,
 368                                                 agno, 0);
 369
 370                 arec = XFS_ALLOC_REC_ADDR(mp, XFS_BUF_TO_BLOCK(bp), 1);
 371                 arec->ar_startblock = cpu_to_be32(XFS_PREALLOC_BLOCKS(mp));
 372                 arec->ar_blockcount = cpu_to_be32(
 373                         agsize - be32_to_cpu(arec->ar_startblock));
 374                 nfree += be32_to_cpu(arec->ar_blockcount);
 375
 376                 error = xfs_bwrite(bp);
 377                 xfs_buf_relse(bp);
 378                 if (error)
 379                         goto error0;
 380
 381                 /*
 382                  * INO btree root block
 383                  */
 384                 bp = xfs_growfs_get_hdr_buf(mp,
 385                                 XFS_AGB_TO_DADDR(mp, agno, XFS_IBT_BLOCK(mp)),
 386                                 BTOBB(mp->m_sb.sb_blocksize), 0,
 387                                 &xfs_inobt_buf_ops);
 388                 if (!bp) {
 389                         error = -ENOMEM;
 390                         goto error0;
 391                 }
 392
 393                 if (xfs_sb_version_hascrc(&mp->m_sb))
 394                         xfs_btree_init_block(mp, bp, XFS_IBT_CRC_MAGIC, 0, 0,
 395                                                 agno, XFS_BTREE_CRC_BLOCKS);
 396                 else
 397                         xfs_btree_init_block(mp, bp, XFS_IBT_MAGIC, 0, 0,
 398                                                 agno, 0);
 399
 400                 error = xfs_bwrite(bp);
 401                 xfs_buf_relse(bp);
 402                 if (error)
 403                         goto error0;
 404
 405                 /*
 406                  * FINO btree root block
 407                  */
 408                 if (xfs_sb_version_hasfinobt(&mp->m_sb)) {
 409                         bp = xfs_growfs_get_hdr_buf(mp,
 410                                 XFS_AGB_TO_DADDR(mp, agno, XFS_FIBT_BLOCK(mp)),
 411                                 BTOBB(mp->m_sb.sb_blocksize), 0,
 412                                 &xfs_inobt_buf_ops);
 413                         if (!bp) {
 414                                 error = -ENOMEM;
 415                                 goto error0;
 416                         }
 417
 418                         if (xfs_sb_version_hascrc(&mp->m_sb))
 419                                 xfs_btree_init_block(mp, bp, XFS_FIBT_CRC_MAGIC,
 420                                                      0, 0, agno,
 421                                                      XFS_BTREE_CRC_BLOCKS);
 422                         else
 423                                 xfs_btree_init_block(mp, bp, XFS_FIBT_MAGIC, 0,
 424                                                      0, agno, 0);
 425
 426                         error = xfs_bwrite(bp);
 427                         xfs_buf_relse(bp);
 428                         if (error)
 429                                 goto error0;
 430                 }
 431
 432         }
 433         xfs_trans_agblocks_delta(tp, nfree);
 434         /*
 435          * There are new blocks in the old last a.g.
 436          */
 437         if (new) {
 438                 /*
 439                  * Change the agi length.
 440                  */
 441                 error = xfs_ialloc_read_agi(mp, tp, agno, &bp);
 442                 if (error) {
 443                         goto error0;
 444                 }
 445                 ASSERT(bp);
 446                 agi = XFS_BUF_TO_AGI(bp);
 447                 be32_add_cpu(&agi->agi_length, new);
 448                 ASSERT(nagcount == oagcount ||
 449                        be32_to_cpu(agi->agi_length) == mp->m_sb.sb_agblocks);
 450                 xfs_ialloc_log_agi(tp, bp, XFS_AGI_LENGTH);
 451                 /*
 452                  * Change agf length.
 453                  */
 454                 error = xfs_alloc_read_agf(mp, tp, agno, 0, &bp);
 455                 if (error) {
 456                         goto error0;
 457                 }
 458                 ASSERT(bp);
 459                 agf = XFS_BUF_TO_AGF(bp);
 460                 be32_add_cpu(&agf->agf_length, new);
 461                 ASSERT(be32_to_cpu(agf->agf_length) ==
 462                        be32_to_cpu(agi->agi_length));
 463
 464                 xfs_alloc_log_agf(tp, bp, XFS_AGF_LENGTH);
 465                 /*
 466                  * Free the new space.
 467                  */
 468                 error = xfs_free_extent(tp, XFS_AGB_TO_FSB(mp, agno,
 469                         be32_to_cpu(agf->agf_length) - new), new);
 470                 if (error) {
 471                         goto error0;
 472                 }
 473         }
 474
 475         /*
 476          * Update changed superblock fields transactionally. These are not
 477          * seen by the rest of the world until the transaction commit applies
 478          * them atomically to the superblock.
 479          */
 480         if (nagcount > oagcount)
 481                 xfs_trans_mod_sb(tp, XFS_TRANS_SB_AGCOUNT, nagcount - oagcount);
 482         if (nb > mp->m_sb.sb_dblocks)
 483                 xfs_trans_mod_sb(tp, XFS_TRANS_SB_DBLOCKS,
 484                                  nb - mp->m_sb.sb_dblocks);
 485         if (nfree)
 486                 xfs_trans_mod_sb(tp, XFS_TRANS_SB_FDBLOCKS, nfree);
 487         if (dpct)
 488                 xfs_trans_mod_sb(tp, XFS_TRANS_SB_IMAXPCT, dpct);
 489         xfs_trans_set_sync(tp);
 490         error = xfs_trans_commit(tp);
 491         if (error)
 492                 return error;
 493
 494         /* New allocation groups fully initialized, so update mount struct */
 495         if (nagimax)
 496                 mp->m_maxagi = nagimax;
 497         if (mp->m_sb.sb_imax_pct) {
 498                 __uint64_t icount = mp->m_sb.sb_dblocks * mp->m_sb.sb_imax_pct;
 499                 do_div(icount, 100);
 500                 mp->m_maxicount = icount << mp->m_sb.sb_inopblog;
 501         } else
 502                 mp->m_maxicount = 0;
 503         xfs_set_low_space_thresholds(mp);
 504
 505         /* update secondary superblocks. */
 506         for (agno = 1; agno < nagcount; agno++) {
 507                 error = 0;
 508                 /*
 509                  * new secondary superblocks need to be zeroed, not read from
 510                  * disk as the contents of the new area we are growing into is
 511                  * completely unknown.
 512                  */
 513                 if (agno < oagcount) {
 514                         error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp,
 515                                   XFS_AGB_TO_DADDR(mp, agno, XFS_SB_BLOCK(mp)),
 516                                   XFS_FSS_TO_BB(mp, 1), 0, &bp,
 517                                   &xfs_sb_buf_ops);
 518                 } else {
 519                         bp = xfs_trans_get_buf(NULL, mp->m_ddev_targp,
 520                                   XFS_AGB_TO_DADDR(mp, agno, XFS_SB_BLOCK(mp)),
 521                                   XFS_FSS_TO_BB(mp, 1), 0);
 522                         if (bp) {
 523                                 bp->b_ops = &xfs_sb_buf_ops;
 524                                 xfs_buf_zero(bp, 0, BBTOB(bp->b_length));
 525                         } else
 526                                 error = -ENOMEM;
 527                 }
 528
 529                 /*
 530                  * If we get an error reading or writing alternate superblocks,
 531                  * continue.  xfs_repair chooses the "best" superblock based
 532                  * on most matches; if we break early, we'll leave more
 533                  * superblocks un-updated than updated, and xfs_repair may
 534                  * pick them over the properly-updated primary.
 535                  */
 536                 if (error) {
 537                         xfs_warn(mp,
 538                 "error %d reading secondary superblock for ag %d",
 539                                 error, agno);
 540                         saved_error = error;
 541                         continue;
 542                 }
 543                 xfs_sb_to_disk(XFS_BUF_TO_SBP(bp), &mp->m_sb);
 544
 545                 error = xfs_bwrite(bp);
 546                 xfs_buf_relse(bp);
 547                 if (error) {
 548                         xfs_warn(mp,
 549                 "write error %d updating secondary superblock for ag %d",
 550                                 error, agno);
 551                         saved_error = error;
 552                         continue;
 553                 }
 554         }
 555         return saved_error ? saved_error : error;
 556
 557  error0:
 558         xfs_trans_cancel(tp);
 559         return error;
 560 }
 561
 562 static int
 563 xfs_growfs_log_private(
 564         xfs_mount_t             *mp,    /* mount point for filesystem */
 565         xfs_growfs_log_t        *in)    /* growfs log input struct */
 566 {
 567         xfs_extlen_t            nb;
 568
 569         nb = in->newblocks;
 570         if (nb < XFS_MIN_LOG_BLOCKS || nb < XFS_B_TO_FSB(mp, XFS_MIN_LOG_BYTES))
 571                 return -EINVAL;
 572         if (nb == mp->m_sb.sb_logblocks &&
 573             in->isint == (mp->m_sb.sb_logstart != 0))
 574                 return -EINVAL;
 575         /*
 576          * Moving the log is hard, need new interfaces to sync
 577          * the log first, hold off all activity while moving it.
 578          * Can have shorter or longer log in the same space,
 579          * or transform internal to external log or vice versa.
 580          */
 581         return -ENOSYS;
 582 }
 583
 584 /*
 585  * protected versions of growfs function acquire and release locks on the mount
 586  * point - exported through ioctls: XFS_IOC_FSGROWFSDATA, XFS_IOC_FSGROWFSLOG,
 587  * XFS_IOC_FSGROWFSRT
 588  */
 589
 590
 591 int
 592 xfs_growfs_data(
 593         xfs_mount_t             *mp,
 594         xfs_growfs_data_t       *in)
 595 {
 596         int error;
 597
 598         if (!capable(CAP_SYS_ADMIN))
 599                 return -EPERM;
 600         if (!mutex_trylock(&mp->m_growlock))
 601                 return -EWOULDBLOCK;
 602         error = xfs_growfs_data_private(mp, in);
 603         /*
 604          * Increment the generation unconditionally, the error could be from
 605          * updating the secondary superblocks, in which case the new size
 606          * is live already.
 607          */
 608         mp->m_generation++;
 609         mutex_unlock(&mp->m_growlock);
 610         return error;
 611 }
 612
 613 int
 614 xfs_growfs_log(
 615         xfs_mount_t             *mp,
 616         xfs_growfs_log_t        *in)
 617 {
 618         int error;
 619
 620         if (!capable(CAP_SYS_ADMIN))
 621                 return -EPERM;
 622         if (!mutex_trylock(&mp->m_growlock))
 623                 return -EWOULDBLOCK;
 624         error = xfs_growfs_log_private(mp, in);
 625         mutex_unlock(&mp->m_growlock);
 626         return error;
 627 }
 628
 629 /*
 630  * exported through ioctl XFS_IOC_FSCOUNTS
 631  */
 632
 633 int
 634 xfs_fs_counts(
 635         xfs_mount_t             *mp,
 636         xfs_fsop_counts_t       *cnt)
 637 {
 638         cnt->allocino = percpu_counter_read_positive(&mp->m_icount);
 639         cnt->freeino = percpu_counter_read_positive(&mp->m_ifree);
 640         cnt->freedata = percpu_counter_read_positive(&mp->m_fdblocks) -
 641                                                         XFS_ALLOC_SET_ASIDE(mp);
 642
 643         spin_lock(&mp->m_sb_lock);
 644         cnt->freertx = mp->m_sb.sb_frextents;
 645         spin_unlock(&mp->m_sb_lock);
 646         return 0;
 647 }
 648
 649 /*
 650  * exported through ioctl XFS_IOC_SET_RESBLKS & XFS_IOC_GET_RESBLKS
 651  *
 652  * xfs_reserve_blocks is called to set m_resblks
 653  * in the in-core mount table. The number of unused reserved blocks
 654  * is kept in m_resblks_avail.
 655  *
 656  * Reserve the requested number of blocks if available. Otherwise return
 657  * as many as possible to satisfy the request. The actual number
 658  * reserved are returned in outval
 659  *
 660  * A null inval pointer indicates that only the current reserved blocks
 661  * available  should  be returned no settings are changed.
 662  */
 663
 664 int
 665 xfs_reserve_blocks(
 666         xfs_mount_t             *mp,
 667         __uint64_t              *inval,
 668         xfs_fsop_resblks_t      *outval)
 669 {
 670         __int64_t               lcounter, delta, fdblks_delta;
 671         __uint64_t              request;
 672
 673         /* If inval is null, report current values and return */
 674         if (inval == (__uint64_t *)NULL) {
 675                 if (!outval)
 676                         return -EINVAL;
 677                 outval->resblks = mp->m_resblks;
 678                 outval->resblks_avail = mp->m_resblks_avail;
 679                 return 0;
 680         }
 681
 682         request = *inval;
 683
 684         /*
 685          * With per-cpu counters, this becomes an interesting
 686          * problem. we needto work out if we are freeing or allocation
 687          * blocks first, then we can do the modification as necessary.
 688          *
 689          * We do this under the m_sb_lock so that if we are near
 690          * ENOSPC, we will hold out any changes while we work out
 691          * what to do. This means that the amount of free space can
 692          * change while we do this, so we need to retry if we end up
 693          * trying to reserve more space than is available.
 694          */
 695 retry:
 696         spin_lock(&mp->m_sb_lock);
 697
 698         /*
 699          * If our previous reservation was larger than the current value,
 700          * then move any unused blocks back to the free pool.
 701          */
 702         fdblks_delta = 0;
 703         if (mp->m_resblks > request) {
 704                 lcounter = mp->m_resblks_avail - request;
 705                 if (lcounter  > 0) {            /* release unused blocks */
 706                         fdblks_delta = lcounter;
 707                         mp->m_resblks_avail -= lcounter;
 708                 }
 709                 mp->m_resblks = request;
 710         } else {
 711                 __int64_t       free;
 712
 713                 free = percpu_counter_sum(&mp->m_fdblocks) -
 714                                                         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_mod_fdblocks(mp, fdblks_delta, 0);
 754                 if (error == -ENOSPC)
 755                         goto retry;
 756         }
 757         return 0;
 758 }
 759
 760 int
 761 xfs_fs_goingdown(
 762         xfs_mount_t     *mp,
 763         __uint32_t      inflags)
 764 {
 765         switch (inflags) {
 766         case XFS_FSOP_GOING_FLAGS_DEFAULT: {
 767                 struct super_block *sb = freeze_bdev(mp->m_super->s_bdev);
 768
 769                 if (sb && !IS_ERR(sb)) {
 770                         xfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT);
 771                         thaw_bdev(sb->s_bdev, sb);
 772                 }
 773
 774                 break;
 775         }
 776         case XFS_FSOP_GOING_FLAGS_LOGFLUSH:
 777                 xfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT);
 778                 break;
 779         case XFS_FSOP_GOING_FLAGS_NOLOGFLUSH:
 780                 xfs_force_shutdown(mp,
 781                                 SHUTDOWN_FORCE_UMOUNT | SHUTDOWN_LOG_IO_ERROR);
 782                 break;
 783         default:
 784                 return -EINVAL;
 785         }
 786
 787         return 0;
 788 }
 789
 790 /*
 791  * Force a shutdown of the filesystem instantly while keeping the filesystem
 792  * consistent. We don't do an unmount here; just shutdown the shop, make sure
 793  * that absolutely nothing persistent happens to this filesystem after this
 794  * point.
 795  */
 796 void
 797 xfs_do_force_shutdown(
 798         xfs_mount_t     *mp,
 799         int             flags,
 800         char            *fname,
 801         int             lnnum)
 802 {
 803         int             logerror;
 804
 805         logerror = flags & SHUTDOWN_LOG_IO_ERROR;
 806
 807         if (!(flags & SHUTDOWN_FORCE_UMOUNT)) {
 808                 xfs_notice(mp,
 809         "%s(0x%x) called from line %d of file %s.  Return address = 0x%p",
 810                         __func__, flags, lnnum, fname, __return_address);
 811         }
 812         /*
 813          * No need to duplicate efforts.
 814          */
 815         if (XFS_FORCED_SHUTDOWN(mp) && !logerror)
 816                 return;
 817
 818         /*
 819          * This flags XFS_MOUNT_FS_SHUTDOWN, makes sure that we don't
 820          * queue up anybody new on the log reservations, and wakes up
 821          * everybody who's sleeping on log reservations to tell them
 822          * the bad news.
 823          */
 824         if (xfs_log_force_umount(mp, logerror))
 825                 return;
 826
 827         if (flags & SHUTDOWN_CORRUPT_INCORE) {
 828                 xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_CORRUPT,
 829     "Corruption of in-memory data detected.  Shutting down filesystem");
 830                 if (XFS_ERRLEVEL_HIGH <= xfs_error_level)
 831                         xfs_stack_trace();
 832         } else if (!(flags & SHUTDOWN_FORCE_UMOUNT)) {
 833                 if (logerror) {
 834                         xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_LOGERROR,
 835                 "Log I/O Error Detected.  Shutting down filesystem");
 836                 } else if (flags & SHUTDOWN_DEVICE_REQ) {
 837                         xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_IOERROR,
 838                 "All device paths lost.  Shutting down filesystem");
 839                 } else if (!(flags & SHUTDOWN_REMOTE_REQ)) {
 840                         xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_IOERROR,
 841                 "I/O Error Detected. Shutting down filesystem");
 842                 }
 843         }
 844         if (!(flags & SHUTDOWN_FORCE_UMOUNT)) {
 845                 xfs_alert(mp,
 846         "Please umount the filesystem and rectify the problem(s)");
 847         }
 848 }