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