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