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_defer.h"
  27 #include "xfs_da_format.h"
  28 #include "xfs_da_btree.h"
  29 #include "xfs_inode.h"
  30 #include "xfs_trans.h"
  31 #include "xfs_inode_item.h"
  32 #include "xfs_error.h"
  33 #include "xfs_btree.h"
  34 #include "xfs_alloc_btree.h"
  35 #include "xfs_alloc.h"
  36 #include "xfs_rmap_btree.h"
  37 #include "xfs_ialloc.h"
  38 #include "xfs_fsops.h"
  39 #include "xfs_itable.h"
  40 #include "xfs_trans_space.h"
  41 #include "xfs_rtalloc.h"
  42 #include "xfs_trace.h"
  43 #include "xfs_log.h"
  44 #include "xfs_filestream.h"
  45 #include "xfs_rmap.h"
  46
  47 /*
  48  * File system operations
  49  */
  50
  51 int
  52 xfs_fs_geometry(
  53         xfs_mount_t             *mp,
  54         xfs_fsop_geom_t         *geo,
  55         int                     new_version)
  56 {
  57
  58         memset(geo, 0, sizeof(*geo));
  59
  60         geo->blocksize = mp->m_sb.sb_blocksize;
  61         geo->rtextsize = mp->m_sb.sb_rextsize;
  62         geo->agblocks = mp->m_sb.sb_agblocks;
  63         geo->agcount = mp->m_sb.sb_agcount;
  64         geo->logblocks = mp->m_sb.sb_logblocks;
  65         geo->sectsize = mp->m_sb.sb_sectsize;
  66         geo->inodesize = mp->m_sb.sb_inodesize;
  67         geo->imaxpct = mp->m_sb.sb_imax_pct;
  68         geo->datablocks = mp->m_sb.sb_dblocks;
  69         geo->rtblocks = mp->m_sb.sb_rblocks;
  70         geo->rtextents = mp->m_sb.sb_rextents;
  71         geo->logstart = mp->m_sb.sb_logstart;
  72         ASSERT(sizeof(geo->uuid)==sizeof(mp->m_sb.sb_uuid));
  73         memcpy(geo->uuid, &mp->m_sb.sb_uuid, sizeof(mp->m_sb.sb_uuid));
  74         if (new_version >= 2) {
  75                 geo->sunit = mp->m_sb.sb_unit;
  76                 geo->swidth = mp->m_sb.sb_width;
  77         }
  78         if (new_version >= 3) {
  79                 geo->version = XFS_FSOP_GEOM_VERSION;
  80                 geo->flags = XFS_FSOP_GEOM_FLAGS_NLINK |
  81                              XFS_FSOP_GEOM_FLAGS_DIRV2 |
  82                         (xfs_sb_version_hasattr(&mp->m_sb) ?
  83                                 XFS_FSOP_GEOM_FLAGS_ATTR : 0) |
  84                         (xfs_sb_version_hasquota(&mp->m_sb) ?
  85                                 XFS_FSOP_GEOM_FLAGS_QUOTA : 0) |
  86                         (xfs_sb_version_hasalign(&mp->m_sb) ?
  87                                 XFS_FSOP_GEOM_FLAGS_IALIGN : 0) |
  88                         (xfs_sb_version_hasdalign(&mp->m_sb) ?
  89                                 XFS_FSOP_GEOM_FLAGS_DALIGN : 0) |
  90                         (xfs_sb_version_hasextflgbit(&mp->m_sb) ?
  91                                 XFS_FSOP_GEOM_FLAGS_EXTFLG : 0) |
  92                         (xfs_sb_version_hassector(&mp->m_sb) ?
  93                                 XFS_FSOP_GEOM_FLAGS_SECTOR : 0) |
  94                         (xfs_sb_version_hasasciici(&mp->m_sb) ?
  95                                 XFS_FSOP_GEOM_FLAGS_DIRV2CI : 0) |
  96                         (xfs_sb_version_haslazysbcount(&mp->m_sb) ?
  97                                 XFS_FSOP_GEOM_FLAGS_LAZYSB : 0) |
  98                         (xfs_sb_version_hasattr2(&mp->m_sb) ?
  99                                 XFS_FSOP_GEOM_FLAGS_ATTR2 : 0) |
 100                         (xfs_sb_version_hasprojid32bit(&mp->m_sb) ?
 101                                 XFS_FSOP_GEOM_FLAGS_PROJID32 : 0) |
 102                         (xfs_sb_version_hascrc(&mp->m_sb) ?
 103                                 XFS_FSOP_GEOM_FLAGS_V5SB : 0) |
 104                         (xfs_sb_version_hasftype(&mp->m_sb) ?
 105                                 XFS_FSOP_GEOM_FLAGS_FTYPE : 0) |
 106                         (xfs_sb_version_hasfinobt(&mp->m_sb) ?
 107                                 XFS_FSOP_GEOM_FLAGS_FINOBT : 0) |
 108                         (xfs_sb_version_hassparseinodes(&mp->m_sb) ?
 109                                 XFS_FSOP_GEOM_FLAGS_SPINODES : 0) |
 110                         (xfs_sb_version_hasrmapbt(&mp->m_sb) ?
 111                                 XFS_FSOP_GEOM_FLAGS_RMAPBT : 0);
 112                 geo->logsectsize = xfs_sb_version_hassector(&mp->m_sb) ?
 113                                 mp->m_sb.sb_logsectsize : BBSIZE;
 114                 geo->rtsectsize = mp->m_sb.sb_blocksize;
 115                 geo->dirblocksize = mp->m_dir_geo->blksize;
 116         }
 117         if (new_version >= 4) {
 118                 geo->flags |=
 119                         (xfs_sb_version_haslogv2(&mp->m_sb) ?
 120                                 XFS_FSOP_GEOM_FLAGS_LOGV2 : 0);
 121                 geo->logsunit = mp->m_sb.sb_logsunit;
 122         }
 123         return 0;
 124 }
 125
 126 static struct xfs_buf *
 127 xfs_growfs_get_hdr_buf(
 128         struct xfs_mount        *mp,
 129         xfs_daddr_t             blkno,
 130         size_t                  numblks,
 131         int                     flags,
 132         const struct xfs_buf_ops *ops)
 133 {
 134         struct xfs_buf          *bp;
 135
 136         bp = xfs_buf_get_uncached(mp->m_ddev_targp, numblks, flags);
 137         if (!bp)
 138                 return NULL;
 139
 140         xfs_buf_zero(bp, 0, BBTOB(bp->b_length));
 141         bp->b_bn = blkno;
 142         bp->b_maps[0].bm_bn = blkno;
 143         bp->b_ops = ops;
 144
 145         return bp;
 146 }
 147
 148 static int
 149 xfs_growfs_data_private(
 150         xfs_mount_t             *mp,            /* mount point for filesystem */
 151         xfs_growfs_data_t       *in)            /* growfs data input struct */
 152 {
 153         xfs_agf_t               *agf;
 154         struct xfs_agfl         *agfl;
 155         xfs_agi_t               *agi;
 156         xfs_agnumber_t          agno;
 157         xfs_extlen_t            agsize;
 158         xfs_extlen_t            tmpsize;
 159         xfs_alloc_rec_t         *arec;
 160         xfs_buf_t               *bp;
 161         int                     bucket;
 162         int                     dpct;
 163         int                     error, saved_error = 0;
 164         xfs_agnumber_t          nagcount;
 165         xfs_agnumber_t          nagimax = 0;
 166         xfs_rfsblock_t          nb, nb_mod;
 167         xfs_rfsblock_t          new;
 168         xfs_rfsblock_t          nfree;
 169         xfs_agnumber_t          oagcount;
 170         int                     pct;
 171         xfs_trans_t             *tp;
 172
 173         nb = in->newblocks;
 174         pct = in->imaxpct;
 175         if (nb < mp->m_sb.sb_dblocks || pct < 0 || pct > 100)
 176                 return -EINVAL;
 177         if ((error = xfs_sb_validate_fsb_count(&mp->m_sb, nb)))
 178                 return error;
 179         dpct = pct - mp->m_sb.sb_imax_pct;
 180         error = xfs_buf_read_uncached(mp->m_ddev_targp,
 181                                 XFS_FSB_TO_BB(mp, nb) - XFS_FSS_TO_BB(mp, 1),
 182                                 XFS_FSS_TO_BB(mp, 1), 0, &bp, NULL);
 183         if (error)
 184                 return error;
 185         xfs_buf_relse(bp);
 186
 187         new = nb;       /* use new as a temporary here */
 188         nb_mod = do_div(new, mp->m_sb.sb_agblocks);
 189         nagcount = new + (nb_mod != 0);
 190         if (nb_mod && nb_mod < XFS_MIN_AG_BLOCKS) {
 191                 nagcount--;
 192                 nb = (xfs_rfsblock_t)nagcount * mp->m_sb.sb_agblocks;
 193                 if (nb < mp->m_sb.sb_dblocks)
 194                         return -EINVAL;
 195         }
 196         new = nb - mp->m_sb.sb_dblocks;
 197         oagcount = mp->m_sb.sb_agcount;
 198
 199         /* allocate the new per-ag structures */
 200         if (nagcount > oagcount) {
 201                 error = xfs_initialize_perag(mp, nagcount, &nagimax);
 202                 if (error)
 203                         return error;
 204         }
 205
 206         error = xfs_trans_alloc(mp, &M_RES(mp)->tr_growdata,
 207                         XFS_GROWFS_SPACE_RES(mp), 0, XFS_TRANS_RESERVE, &tp);
 208         if (error)
 209                 return error;
 210
 211         /*
 212          * Write new AG headers to disk. Non-transactional, but written
 213          * synchronously so they are completed prior to the growfs transaction
 214          * being logged.
 215          */
 216         nfree = 0;
 217         for (agno = nagcount - 1; agno >= oagcount; agno--, new -= agsize) {
 218                 __be32  *agfl_bno;
 219
 220                 /*
 221                  * AG freespace header block
 222                  */
 223                 bp = xfs_growfs_get_hdr_buf(mp,
 224                                 XFS_AG_DADDR(mp, agno, XFS_AGF_DADDR(mp)),
 225                                 XFS_FSS_TO_BB(mp, 1), 0,
 226                                 &xfs_agf_buf_ops);
 227                 if (!bp) {
 228                         error = -ENOMEM;
 229                         goto error0;
 230                 }
 231
 232                 agf = XFS_BUF_TO_AGF(bp);
 233                 agf->agf_magicnum = cpu_to_be32(XFS_AGF_MAGIC);
 234                 agf->agf_versionnum = cpu_to_be32(XFS_AGF_VERSION);
 235                 agf->agf_seqno = cpu_to_be32(agno);
 236                 if (agno == nagcount - 1)
 237                         agsize =
 238                                 nb -
 239                                 (agno * (xfs_rfsblock_t)mp->m_sb.sb_agblocks);
 240                 else
 241                         agsize = mp->m_sb.sb_agblocks;
 242                 agf->agf_length = cpu_to_be32(agsize);
 243                 agf->agf_roots[XFS_BTNUM_BNOi] = cpu_to_be32(XFS_BNO_BLOCK(mp));
 244                 agf->agf_roots[XFS_BTNUM_CNTi] = cpu_to_be32(XFS_CNT_BLOCK(mp));
 245                 agf->agf_levels[XFS_BTNUM_BNOi] = cpu_to_be32(1);
 246                 agf->agf_levels[XFS_BTNUM_CNTi] = cpu_to_be32(1);
 247                 if (xfs_sb_version_hasrmapbt(&mp->m_sb)) {
 248                         agf->agf_roots[XFS_BTNUM_RMAPi] =
 249                                                 cpu_to_be32(XFS_RMAP_BLOCK(mp));
 250                         agf->agf_levels[XFS_BTNUM_RMAPi] = cpu_to_be32(1);
 251                         agf->agf_rmap_blocks = cpu_to_be32(1);
 252                 }
 253
 254                 agf->agf_flfirst = cpu_to_be32(1);
 255                 agf->agf_fllast = 0;
 256                 agf->agf_flcount = 0;
 257                 tmpsize = agsize - mp->m_ag_prealloc_blocks;
 258                 agf->agf_freeblks = cpu_to_be32(tmpsize);
 259                 agf->agf_longest = cpu_to_be32(tmpsize);
 260                 if (xfs_sb_version_hascrc(&mp->m_sb))
 261                         uuid_copy(&agf->agf_uuid, &mp->m_sb.sb_meta_uuid);
 262
 263                 error = xfs_bwrite(bp);
 264                 xfs_buf_relse(bp);
 265                 if (error)
 266                         goto error0;
 267
 268                 /*
 269                  * AG freelist header block
 270                  */
 271                 bp = xfs_growfs_get_hdr_buf(mp,
 272                                 XFS_AG_DADDR(mp, agno, XFS_AGFL_DADDR(mp)),
 273                                 XFS_FSS_TO_BB(mp, 1), 0,
 274                                 &xfs_agfl_buf_ops);
 275                 if (!bp) {
 276                         error = -ENOMEM;
 277                         goto error0;
 278                 }
 279
 280                 agfl = XFS_BUF_TO_AGFL(bp);
 281                 if (xfs_sb_version_hascrc(&mp->m_sb)) {
 282                         agfl->agfl_magicnum = cpu_to_be32(XFS_AGFL_MAGIC);
 283                         agfl->agfl_seqno = cpu_to_be32(agno);
 284                         uuid_copy(&agfl->agfl_uuid, &mp->m_sb.sb_meta_uuid);
 285                 }
 286
 287                 agfl_bno = XFS_BUF_TO_AGFL_BNO(mp, bp);
 288                 for (bucket = 0; bucket < XFS_AGFL_SIZE(mp); bucket++)
 289                         agfl_bno[bucket] = cpu_to_be32(NULLAGBLOCK);
 290
 291                 error = xfs_bwrite(bp);
 292                 xfs_buf_relse(bp);
 293                 if (error)
 294                         goto error0;
 295
 296                 /*
 297                  * AG inode header block
 298                  */
 299                 bp = xfs_growfs_get_hdr_buf(mp,
 300                                 XFS_AG_DADDR(mp, agno, XFS_AGI_DADDR(mp)),
 301                                 XFS_FSS_TO_BB(mp, 1), 0,
 302                                 &xfs_agi_buf_ops);
 303                 if (!bp) {
 304                         error = -ENOMEM;
 305                         goto error0;
 306                 }
 307
 308                 agi = XFS_BUF_TO_AGI(bp);
 309                 agi->agi_magicnum = cpu_to_be32(XFS_AGI_MAGIC);
 310                 agi->agi_versionnum = cpu_to_be32(XFS_AGI_VERSION);
 311                 agi->agi_seqno = cpu_to_be32(agno);
 312                 agi->agi_length = cpu_to_be32(agsize);
 313                 agi->agi_count = 0;
 314                 agi->agi_root = cpu_to_be32(XFS_IBT_BLOCK(mp));
 315                 agi->agi_level = cpu_to_be32(1);
 316                 agi->agi_freecount = 0;
 317                 agi->agi_newino = cpu_to_be32(NULLAGINO);
 318                 agi->agi_dirino = cpu_to_be32(NULLAGINO);
 319                 if (xfs_sb_version_hascrc(&mp->m_sb))
 320                         uuid_copy(&agi->agi_uuid, &mp->m_sb.sb_meta_uuid);
 321                 if (xfs_sb_version_hasfinobt(&mp->m_sb)) {
 322                         agi->agi_free_root = cpu_to_be32(XFS_FIBT_BLOCK(mp));
 323                         agi->agi_free_level = cpu_to_be32(1);
 324                 }
 325                 for (bucket = 0; bucket < XFS_AGI_UNLINKED_BUCKETS; bucket++)
 326                         agi->agi_unlinked[bucket] = cpu_to_be32(NULLAGINO);
 327
 328                 error = xfs_bwrite(bp);
 329                 xfs_buf_relse(bp);
 330                 if (error)
 331                         goto error0;
 332
 333                 /*
 334                  * BNO btree root block
 335                  */
 336                 bp = xfs_growfs_get_hdr_buf(mp,
 337                                 XFS_AGB_TO_DADDR(mp, agno, XFS_BNO_BLOCK(mp)),
 338                                 BTOBB(mp->m_sb.sb_blocksize), 0,
 339                                 &xfs_allocbt_buf_ops);
 340
 341                 if (!bp) {
 342                         error = -ENOMEM;
 343                         goto error0;
 344                 }
 345
 346                 if (xfs_sb_version_hascrc(&mp->m_sb))
 347                         xfs_btree_init_block(mp, bp, XFS_ABTB_CRC_MAGIC, 0, 1,
 348                                                 agno, XFS_BTREE_CRC_BLOCKS);
 349                 else
 350                         xfs_btree_init_block(mp, bp, XFS_ABTB_MAGIC, 0, 1,
 351                                                 agno, 0);
 352
 353                 arec = XFS_ALLOC_REC_ADDR(mp, XFS_BUF_TO_BLOCK(bp), 1);
 354                 arec->ar_startblock = cpu_to_be32(mp->m_ag_prealloc_blocks);
 355                 arec->ar_blockcount = cpu_to_be32(
 356                         agsize - be32_to_cpu(arec->ar_startblock));
 357
 358                 error = xfs_bwrite(bp);
 359                 xfs_buf_relse(bp);
 360                 if (error)
 361                         goto error0;
 362
 363                 /*
 364                  * CNT btree root block
 365                  */
 366                 bp = xfs_growfs_get_hdr_buf(mp,
 367                                 XFS_AGB_TO_DADDR(mp, agno, XFS_CNT_BLOCK(mp)),
 368                                 BTOBB(mp->m_sb.sb_blocksize), 0,
 369                                 &xfs_allocbt_buf_ops);
 370                 if (!bp) {
 371                         error = -ENOMEM;
 372                         goto error0;
 373                 }
 374
 375                 if (xfs_sb_version_hascrc(&mp->m_sb))
 376                         xfs_btree_init_block(mp, bp, XFS_ABTC_CRC_MAGIC, 0, 1,
 377                                                 agno, XFS_BTREE_CRC_BLOCKS);
 378                 else
 379                         xfs_btree_init_block(mp, bp, XFS_ABTC_MAGIC, 0, 1,
 380                                                 agno, 0);
 381
 382                 arec = XFS_ALLOC_REC_ADDR(mp, XFS_BUF_TO_BLOCK(bp), 1);
 383                 arec->ar_startblock = cpu_to_be32(mp->m_ag_prealloc_blocks);
 384                 arec->ar_blockcount = cpu_to_be32(
 385                         agsize - be32_to_cpu(arec->ar_startblock));
 386                 nfree += be32_to_cpu(arec->ar_blockcount);
 387
 388                 error = xfs_bwrite(bp);
 389                 xfs_buf_relse(bp);
 390                 if (error)
 391                         goto error0;
 392
 393                 /* RMAP btree root block */
 394                 if (xfs_sb_version_hasrmapbt(&mp->m_sb)) {
 395                         struct xfs_rmap_rec     *rrec;
 396                         struct xfs_btree_block  *block;
 397
 398                         bp = xfs_growfs_get_hdr_buf(mp,
 399                                 XFS_AGB_TO_DADDR(mp, agno, XFS_RMAP_BLOCK(mp)),
 400                                 BTOBB(mp->m_sb.sb_blocksize), 0,
 401                                 &xfs_rmapbt_buf_ops);
 402                         if (!bp) {
 403                                 error = -ENOMEM;
 404                                 goto error0;
 405                         }
 406
 407                         xfs_btree_init_block(mp, bp, XFS_RMAP_CRC_MAGIC, 0, 0,
 408                                                 agno, XFS_BTREE_CRC_BLOCKS);
 409                         block = XFS_BUF_TO_BLOCK(bp);
 410
 411
 412                         /*
 413                          * mark the AG header regions as static metadata The BNO
 414                          * btree block is the first block after the headers, so
 415                          * it's location defines the size of region the static
 416                          * metadata consumes.
 417                          *
 418                          * Note: unlike mkfs, we never have to account for log
 419                          * space when growing the data regions
 420                          */
 421                         rrec = XFS_RMAP_REC_ADDR(block, 1);
 422                         rrec->rm_startblock = 0;
 423                         rrec->rm_blockcount = cpu_to_be32(XFS_BNO_BLOCK(mp));
 424                         rrec->rm_owner = cpu_to_be64(XFS_RMAP_OWN_FS);
 425                         rrec->rm_offset = 0;
 426                         be16_add_cpu(&block->bb_numrecs, 1);
 427
 428                         /* account freespace btree root blocks */
 429                         rrec = XFS_RMAP_REC_ADDR(block, 2);
 430                         rrec->rm_startblock = cpu_to_be32(XFS_BNO_BLOCK(mp));
 431                         rrec->rm_blockcount = cpu_to_be32(2);
 432                         rrec->rm_owner = cpu_to_be64(XFS_RMAP_OWN_AG);
 433                         rrec->rm_offset = 0;
 434                         be16_add_cpu(&block->bb_numrecs, 1);
 435
 436                         /* account inode btree root blocks */
 437                         rrec = XFS_RMAP_REC_ADDR(block, 3);
 438                         rrec->rm_startblock = cpu_to_be32(XFS_IBT_BLOCK(mp));
 439                         rrec->rm_blockcount = cpu_to_be32(XFS_RMAP_BLOCK(mp) -
 440                                                         XFS_IBT_BLOCK(mp));
 441                         rrec->rm_owner = cpu_to_be64(XFS_RMAP_OWN_INOBT);
 442                         rrec->rm_offset = 0;
 443                         be16_add_cpu(&block->bb_numrecs, 1);
 444
 445                         /* account for rmap btree root */
 446                         rrec = XFS_RMAP_REC_ADDR(block, 4);
 447                         rrec->rm_startblock = cpu_to_be32(XFS_RMAP_BLOCK(mp));
 448                         rrec->rm_blockcount = cpu_to_be32(1);
 449                         rrec->rm_owner = cpu_to_be64(XFS_RMAP_OWN_AG);
 450                         rrec->rm_offset = 0;
 451                         be16_add_cpu(&block->bb_numrecs, 1);
 452
 453                         error = xfs_bwrite(bp);
 454                         xfs_buf_relse(bp);
 455                         if (error)
 456                                 goto error0;
 457                 }
 458
 459                 /*
 460                  * INO btree root block
 461                  */
 462                 bp = xfs_growfs_get_hdr_buf(mp,
 463                                 XFS_AGB_TO_DADDR(mp, agno, XFS_IBT_BLOCK(mp)),
 464                                 BTOBB(mp->m_sb.sb_blocksize), 0,
 465                                 &xfs_inobt_buf_ops);
 466                 if (!bp) {
 467                         error = -ENOMEM;
 468                         goto error0;
 469                 }
 470
 471                 if (xfs_sb_version_hascrc(&mp->m_sb))
 472                         xfs_btree_init_block(mp, bp, XFS_IBT_CRC_MAGIC, 0, 0,
 473                                                 agno, XFS_BTREE_CRC_BLOCKS);
 474                 else
 475                         xfs_btree_init_block(mp, bp, XFS_IBT_MAGIC, 0, 0,
 476                                                 agno, 0);
 477
 478                 error = xfs_bwrite(bp);
 479                 xfs_buf_relse(bp);
 480                 if (error)
 481                         goto error0;
 482
 483                 /*
 484                  * FINO btree root block
 485                  */
 486                 if (xfs_sb_version_hasfinobt(&mp->m_sb)) {
 487                         bp = xfs_growfs_get_hdr_buf(mp,
 488                                 XFS_AGB_TO_DADDR(mp, agno, XFS_FIBT_BLOCK(mp)),
 489                                 BTOBB(mp->m_sb.sb_blocksize), 0,
 490                                 &xfs_inobt_buf_ops);
 491                         if (!bp) {
 492                                 error = -ENOMEM;
 493                                 goto error0;
 494                         }
 495
 496                         if (xfs_sb_version_hascrc(&mp->m_sb))
 497                                 xfs_btree_init_block(mp, bp, XFS_FIBT_CRC_MAGIC,
 498                                                      0, 0, agno,
 499                                                      XFS_BTREE_CRC_BLOCKS);
 500                         else
 501                                 xfs_btree_init_block(mp, bp, XFS_FIBT_MAGIC, 0,
 502                                                      0, agno, 0);
 503
 504                         error = xfs_bwrite(bp);
 505                         xfs_buf_relse(bp);
 506                         if (error)
 507                                 goto error0;
 508                 }
 509
 510         }
 511         xfs_trans_agblocks_delta(tp, nfree);
 512         /*
 513          * There are new blocks in the old last a.g.
 514          */
 515         if (new) {
 516                 struct xfs_owner_info   oinfo;
 517
 518                 /*
 519                  * Change the agi length.
 520                  */
 521                 error = xfs_ialloc_read_agi(mp, tp, agno, &bp);
 522                 if (error) {
 523                         goto error0;
 524                 }
 525                 ASSERT(bp);
 526                 agi = XFS_BUF_TO_AGI(bp);
 527                 be32_add_cpu(&agi->agi_length, new);
 528                 ASSERT(nagcount == oagcount ||
 529                        be32_to_cpu(agi->agi_length) == mp->m_sb.sb_agblocks);
 530                 xfs_ialloc_log_agi(tp, bp, XFS_AGI_LENGTH);
 531                 /*
 532                  * Change agf length.
 533                  */
 534                 error = xfs_alloc_read_agf(mp, tp, agno, 0, &bp);
 535                 if (error) {
 536                         goto error0;
 537                 }
 538                 ASSERT(bp);
 539                 agf = XFS_BUF_TO_AGF(bp);
 540                 be32_add_cpu(&agf->agf_length, new);
 541                 ASSERT(be32_to_cpu(agf->agf_length) ==
 542                        be32_to_cpu(agi->agi_length));
 543
 544                 xfs_alloc_log_agf(tp, bp, XFS_AGF_LENGTH);
 545
 546                 /*
 547                  * Free the new space.
 548                  *
 549                  * XFS_RMAP_OWN_NULL is used here to tell the rmap btree that
 550                  * this doesn't actually exist in the rmap btree.
 551                  */
 552                 xfs_rmap_ag_owner(&oinfo, XFS_RMAP_OWN_NULL);
 553                 error = xfs_free_extent(tp,
 554                                 XFS_AGB_TO_FSB(mp, agno,
 555                                         be32_to_cpu(agf->agf_length) - new),
 556                                 new, &oinfo, XFS_AG_RESV_NONE);
 557                 if (error)
 558                         goto error0;
 559         }
 560
 561         /*
 562          * Update changed superblock fields transactionally. These are not
 563          * seen by the rest of the world until the transaction commit applies
 564          * them atomically to the superblock.
 565          */
 566         if (nagcount > oagcount)
 567                 xfs_trans_mod_sb(tp, XFS_TRANS_SB_AGCOUNT, nagcount - oagcount);
 568         if (nb > mp->m_sb.sb_dblocks)
 569                 xfs_trans_mod_sb(tp, XFS_TRANS_SB_DBLOCKS,
 570                                  nb - mp->m_sb.sb_dblocks);
 571         if (nfree)
 572                 xfs_trans_mod_sb(tp, XFS_TRANS_SB_FDBLOCKS, nfree);
 573         if (dpct)
 574                 xfs_trans_mod_sb(tp, XFS_TRANS_SB_IMAXPCT, dpct);
 575         xfs_trans_set_sync(tp);
 576         error = xfs_trans_commit(tp);
 577         if (error)
 578                 return error;
 579
 580         /* New allocation groups fully initialized, so update mount struct */
 581         if (nagimax)
 582                 mp->m_maxagi = nagimax;
 583         if (mp->m_sb.sb_imax_pct) {
 584                 __uint64_t icount = mp->m_sb.sb_dblocks * mp->m_sb.sb_imax_pct;
 585                 do_div(icount, 100);
 586                 mp->m_maxicount = icount << mp->m_sb.sb_inopblog;
 587         } else
 588                 mp->m_maxicount = 0;
 589         xfs_set_low_space_thresholds(mp);
 590         mp->m_alloc_set_aside = xfs_alloc_set_aside(mp);
 591
 592         /* update secondary superblocks. */
 593         for (agno = 1; agno < nagcount; agno++) {
 594                 error = 0;
 595                 /*
 596                  * new secondary superblocks need to be zeroed, not read from
 597                  * disk as the contents of the new area we are growing into is
 598                  * completely unknown.
 599                  */
 600                 if (agno < oagcount) {
 601                         error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp,
 602                                   XFS_AGB_TO_DADDR(mp, agno, XFS_SB_BLOCK(mp)),
 603                                   XFS_FSS_TO_BB(mp, 1), 0, &bp,
 604                                   &xfs_sb_buf_ops);
 605                 } else {
 606                         bp = xfs_trans_get_buf(NULL, mp->m_ddev_targp,
 607                                   XFS_AGB_TO_DADDR(mp, agno, XFS_SB_BLOCK(mp)),
 608                                   XFS_FSS_TO_BB(mp, 1), 0);
 609                         if (bp) {
 610                                 bp->b_ops = &xfs_sb_buf_ops;
 611                                 xfs_buf_zero(bp, 0, BBTOB(bp->b_length));
 612                         } else
 613                                 error = -ENOMEM;
 614                 }
 615
 616                 /*
 617                  * If we get an error reading or writing alternate superblocks,
 618                  * continue.  xfs_repair chooses the "best" superblock based
 619                  * on most matches; if we break early, we'll leave more
 620                  * superblocks un-updated than updated, and xfs_repair may
 621                  * pick them over the properly-updated primary.
 622                  */
 623                 if (error) {
 624                         xfs_warn(mp,
 625                 "error %d reading secondary superblock for ag %d",
 626                                 error, agno);
 627                         saved_error = error;
 628                         continue;
 629                 }
 630                 xfs_sb_to_disk(XFS_BUF_TO_SBP(bp), &mp->m_sb);
 631
 632                 error = xfs_bwrite(bp);
 633                 xfs_buf_relse(bp);
 634                 if (error) {
 635                         xfs_warn(mp,
 636                 "write error %d updating secondary superblock for ag %d",
 637                                 error, agno);
 638                         saved_error = error;
 639                         continue;
 640                 }
 641         }
 642         return saved_error ? saved_error : error;
 643
 644  error0:
 645         xfs_trans_cancel(tp);
 646         return error;
 647 }
 648
 649 static int
 650 xfs_growfs_log_private(
 651         xfs_mount_t             *mp,    /* mount point for filesystem */
 652         xfs_growfs_log_t        *in)    /* growfs log input struct */
 653 {
 654         xfs_extlen_t            nb;
 655
 656         nb = in->newblocks;
 657         if (nb < XFS_MIN_LOG_BLOCKS || nb < XFS_B_TO_FSB(mp, XFS_MIN_LOG_BYTES))
 658                 return -EINVAL;
 659         if (nb == mp->m_sb.sb_logblocks &&
 660             in->isint == (mp->m_sb.sb_logstart != 0))
 661                 return -EINVAL;
 662         /*
 663          * Moving the log is hard, need new interfaces to sync
 664          * the log first, hold off all activity while moving it.
 665          * Can have shorter or longer log in the same space,
 666          * or transform internal to external log or vice versa.
 667          */
 668         return -ENOSYS;
 669 }
 670
 671 /*
 672  * protected versions of growfs function acquire and release locks on the mount
 673  * point - exported through ioctls: XFS_IOC_FSGROWFSDATA, XFS_IOC_FSGROWFSLOG,
 674  * XFS_IOC_FSGROWFSRT
 675  */
 676
 677
 678 int
 679 xfs_growfs_data(
 680         xfs_mount_t             *mp,
 681         xfs_growfs_data_t       *in)
 682 {
 683         int error;
 684
 685         if (!capable(CAP_SYS_ADMIN))
 686                 return -EPERM;
 687         if (!mutex_trylock(&mp->m_growlock))
 688                 return -EWOULDBLOCK;
 689         error = xfs_growfs_data_private(mp, in);
 690         /*
 691          * Increment the generation unconditionally, the error could be from
 692          * updating the secondary superblocks, in which case the new size
 693          * is live already.
 694          */
 695         mp->m_generation++;
 696         mutex_unlock(&mp->m_growlock);
 697         return error;
 698 }
 699
 700 int
 701 xfs_growfs_log(
 702         xfs_mount_t             *mp,
 703         xfs_growfs_log_t        *in)
 704 {
 705         int error;
 706
 707         if (!capable(CAP_SYS_ADMIN))
 708                 return -EPERM;
 709         if (!mutex_trylock(&mp->m_growlock))
 710                 return -EWOULDBLOCK;
 711         error = xfs_growfs_log_private(mp, in);
 712         mutex_unlock(&mp->m_growlock);
 713         return error;
 714 }
 715
 716 /*
 717  * exported through ioctl XFS_IOC_FSCOUNTS
 718  */
 719
 720 int
 721 xfs_fs_counts(
 722         xfs_mount_t             *mp,
 723         xfs_fsop_counts_t       *cnt)
 724 {
 725         cnt->allocino = percpu_counter_read_positive(&mp->m_icount);
 726         cnt->freeino = percpu_counter_read_positive(&mp->m_ifree);
 727         cnt->freedata = percpu_counter_read_positive(&mp->m_fdblocks) -
 728                                                 mp->m_alloc_set_aside;
 729
 730         spin_lock(&mp->m_sb_lock);
 731         cnt->freertx = mp->m_sb.sb_frextents;
 732         spin_unlock(&mp->m_sb_lock);
 733         return 0;
 734 }
 735
 736 /*
 737  * exported through ioctl XFS_IOC_SET_RESBLKS & XFS_IOC_GET_RESBLKS
 738  *
 739  * xfs_reserve_blocks is called to set m_resblks
 740  * in the in-core mount table. The number of unused reserved blocks
 741  * is kept in m_resblks_avail.
 742  *
 743  * Reserve the requested number of blocks if available. Otherwise return
 744  * as many as possible to satisfy the request. The actual number
 745  * reserved are returned in outval
 746  *
 747  * A null inval pointer indicates that only the current reserved blocks
 748  * available  should  be returned no settings are changed.
 749  */
 750
 751 int
 752 xfs_reserve_blocks(
 753         xfs_mount_t             *mp,
 754         __uint64_t              *inval,
 755         xfs_fsop_resblks_t      *outval)
 756 {
 757         __int64_t               lcounter, delta;
 758         __int64_t               fdblks_delta = 0;
 759         __uint64_t              request;
 760         __int64_t               free;
 761         int                     error = 0;
 762
 763         /* If inval is null, report current values and return */
 764         if (inval == (__uint64_t *)NULL) {
 765                 if (!outval)
 766                         return -EINVAL;
 767                 outval->resblks = mp->m_resblks;
 768                 outval->resblks_avail = mp->m_resblks_avail;
 769                 return 0;
 770         }
 771
 772         request = *inval;
 773
 774         /*
 775          * With per-cpu counters, this becomes an interesting problem. we need
 776          * to work out if we are freeing or allocation blocks first, then we can
 777          * do the modification as necessary.
 778          *
 779          * We do this under the m_sb_lock so that if we are near ENOSPC, we will
 780          * hold out any changes while we work out what to do. This means that
 781          * the amount of free space can change while we do this, so we need to
 782          * retry if we end up trying to reserve more space than is available.
 783          */
 784         spin_lock(&mp->m_sb_lock);
 785
 786         /*
 787          * If our previous reservation was larger than the current value,
 788          * then move any unused blocks back to the free pool. Modify the resblks
 789          * counters directly since we shouldn't have any problems unreserving
 790          * space.
 791          */
 792         if (mp->m_resblks > request) {
 793                 lcounter = mp->m_resblks_avail - request;
 794                 if (lcounter  > 0) {            /* release unused blocks */
 795                         fdblks_delta = lcounter;
 796                         mp->m_resblks_avail -= lcounter;
 797                 }
 798                 mp->m_resblks = request;
 799                 if (fdblks_delta) {
 800                         spin_unlock(&mp->m_sb_lock);
 801                         error = xfs_mod_fdblocks(mp, fdblks_delta, 0);
 802                         spin_lock(&mp->m_sb_lock);
 803                 }
 804
 805                 goto out;
 806         }
 807
 808         /*
 809          * If the request is larger than the current reservation, reserve the
 810          * blocks before we update the reserve counters. Sample m_fdblocks and
 811          * perform a partial reservation if the request exceeds free space.
 812          */
 813         error = -ENOSPC;
 814         do {
 815                 free = percpu_counter_sum(&mp->m_fdblocks) -
 816                                                 mp->m_alloc_set_aside;
 817                 if (!free)
 818                         break;
 819
 820                 delta = request - mp->m_resblks;
 821                 lcounter = free - delta;
 822                 if (lcounter < 0)
 823                         /* We can't satisfy the request, just get what we can */
 824                         fdblks_delta = free;
 825                 else
 826                         fdblks_delta = delta;
 827
 828                 /*
 829                  * We'll either succeed in getting space from the free block
 830                  * count or we'll get an ENOSPC. If we get a ENOSPC, it means
 831                  * things changed while we were calculating fdblks_delta and so
 832                  * we should try again to see if there is anything left to
 833                  * reserve.
 834                  *
 835                  * Don't set the reserved flag here - we don't want to reserve
 836                  * the extra reserve blocks from the reserve.....
 837                  */
 838                 spin_unlock(&mp->m_sb_lock);
 839                 error = xfs_mod_fdblocks(mp, -fdblks_delta, 0);
 840                 spin_lock(&mp->m_sb_lock);
 841         } while (error == -ENOSPC);
 842
 843         /*
 844          * Update the reserve counters if blocks have been successfully
 845          * allocated.
 846          */
 847         if (!error && fdblks_delta) {
 848                 mp->m_resblks += fdblks_delta;
 849                 mp->m_resblks_avail += fdblks_delta;
 850         }
 851
 852 out:
 853         if (outval) {
 854                 outval->resblks = mp->m_resblks;
 855                 outval->resblks_avail = mp->m_resblks_avail;
 856         }
 857
 858         spin_unlock(&mp->m_sb_lock);
 859         return error;
 860 }
 861
 862 int
 863 xfs_fs_goingdown(
 864         xfs_mount_t     *mp,
 865         __uint32_t      inflags)
 866 {
 867         switch (inflags) {
 868         case XFS_FSOP_GOING_FLAGS_DEFAULT: {
 869                 struct super_block *sb = freeze_bdev(mp->m_super->s_bdev);
 870
 871                 if (sb && !IS_ERR(sb)) {
 872                         xfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT);
 873                         thaw_bdev(sb->s_bdev, sb);
 874                 }
 875
 876                 break;
 877         }
 878         case XFS_FSOP_GOING_FLAGS_LOGFLUSH:
 879                 xfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT);
 880                 break;
 881         case XFS_FSOP_GOING_FLAGS_NOLOGFLUSH:
 882                 xfs_force_shutdown(mp,
 883                                 SHUTDOWN_FORCE_UMOUNT | SHUTDOWN_LOG_IO_ERROR);
 884                 break;
 885         default:
 886                 return -EINVAL;
 887         }
 888
 889         return 0;
 890 }
 891
 892 /*
 893  * Force a shutdown of the filesystem instantly while keeping the filesystem
 894  * consistent. We don't do an unmount here; just shutdown the shop, make sure
 895  * that absolutely nothing persistent happens to this filesystem after this
 896  * point.
 897  */
 898 void
 899 xfs_do_force_shutdown(
 900         xfs_mount_t     *mp,
 901         int             flags,
 902         char            *fname,
 903         int             lnnum)
 904 {
 905         int             logerror;
 906
 907         logerror = flags & SHUTDOWN_LOG_IO_ERROR;
 908
 909         if (!(flags & SHUTDOWN_FORCE_UMOUNT)) {
 910                 xfs_notice(mp,
 911         "%s(0x%x) called from line %d of file %s.  Return address = 0x%p",
 912                         __func__, flags, lnnum, fname, __return_address);
 913         }
 914         /*
 915          * No need to duplicate efforts.
 916          */
 917         if (XFS_FORCED_SHUTDOWN(mp) && !logerror)
 918                 return;
 919
 920         /*
 921          * This flags XFS_MOUNT_FS_SHUTDOWN, makes sure that we don't
 922          * queue up anybody new on the log reservations, and wakes up
 923          * everybody who's sleeping on log reservations to tell them
 924          * the bad news.
 925          */
 926         if (xfs_log_force_umount(mp, logerror))
 927                 return;
 928
 929         if (flags & SHUTDOWN_CORRUPT_INCORE) {
 930                 xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_CORRUPT,
 931     "Corruption of in-memory data detected.  Shutting down filesystem");
 932                 if (XFS_ERRLEVEL_HIGH <= xfs_error_level)
 933                         xfs_stack_trace();
 934         } else if (!(flags & SHUTDOWN_FORCE_UMOUNT)) {
 935                 if (logerror) {
 936                         xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_LOGERROR,
 937                 "Log I/O Error Detected.  Shutting down filesystem");
 938                 } else if (flags & SHUTDOWN_DEVICE_REQ) {
 939                         xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_IOERROR,
 940                 "All device paths lost.  Shutting down filesystem");
 941                 } else if (!(flags & SHUTDOWN_REMOTE_REQ)) {
 942                         xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_IOERROR,
 943                 "I/O Error Detected. Shutting down filesystem");
 944                 }
 945         }
 946         if (!(flags & SHUTDOWN_FORCE_UMOUNT)) {
 947                 xfs_alert(mp,
 948         "Please umount the filesystem and rectify the problem(s)");
 949         }
 950 }