linux/fs/xfs/xfs_fsops.c
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   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#include "xfs_ag_resv.h"
  47
  48/*
  49 * File system operations
  50 */
  51
  52int
  53xfs_fs_geometry(
  54        xfs_mount_t             *mp,
  55        xfs_fsop_geom_t         *geo,
  56        int                     new_version)
  57{
  58
  59        memset(geo, 0, sizeof(*geo));
  60
  61        geo->blocksize = mp->m_sb.sb_blocksize;
  62        geo->rtextsize = mp->m_sb.sb_rextsize;
  63        geo->agblocks = mp->m_sb.sb_agblocks;
  64        geo->agcount = mp->m_sb.sb_agcount;
  65        geo->logblocks = mp->m_sb.sb_logblocks;
  66        geo->sectsize = mp->m_sb.sb_sectsize;
  67        geo->inodesize = mp->m_sb.sb_inodesize;
  68        geo->imaxpct = mp->m_sb.sb_imax_pct;
  69        geo->datablocks = mp->m_sb.sb_dblocks;
  70        geo->rtblocks = mp->m_sb.sb_rblocks;
  71        geo->rtextents = mp->m_sb.sb_rextents;
  72        geo->logstart = mp->m_sb.sb_logstart;
  73        ASSERT(sizeof(geo->uuid)==sizeof(mp->m_sb.sb_uuid));
  74        memcpy(geo->uuid, &mp->m_sb.sb_uuid, sizeof(mp->m_sb.sb_uuid));
  75        if (new_version >= 2) {
  76                geo->sunit = mp->m_sb.sb_unit;
  77                geo->swidth = mp->m_sb.sb_width;
  78        }
  79        if (new_version >= 3) {
  80                geo->version = XFS_FSOP_GEOM_VERSION;
  81                geo->flags = XFS_FSOP_GEOM_FLAGS_NLINK |
  82                             XFS_FSOP_GEOM_FLAGS_DIRV2 |
  83                        (xfs_sb_version_hasattr(&mp->m_sb) ?
  84                                XFS_FSOP_GEOM_FLAGS_ATTR : 0) |
  85                        (xfs_sb_version_hasquota(&mp->m_sb) ?
  86                                XFS_FSOP_GEOM_FLAGS_QUOTA : 0) |
  87                        (xfs_sb_version_hasalign(&mp->m_sb) ?
  88                                XFS_FSOP_GEOM_FLAGS_IALIGN : 0) |
  89                        (xfs_sb_version_hasdalign(&mp->m_sb) ?
  90                                XFS_FSOP_GEOM_FLAGS_DALIGN : 0) |
  91                        (xfs_sb_version_hasextflgbit(&mp->m_sb) ?
  92                                XFS_FSOP_GEOM_FLAGS_EXTFLG : 0) |
  93                        (xfs_sb_version_hassector(&mp->m_sb) ?
  94                                XFS_FSOP_GEOM_FLAGS_SECTOR : 0) |
  95                        (xfs_sb_version_hasasciici(&mp->m_sb) ?
  96                                XFS_FSOP_GEOM_FLAGS_DIRV2CI : 0) |
  97                        (xfs_sb_version_haslazysbcount(&mp->m_sb) ?
  98                                XFS_FSOP_GEOM_FLAGS_LAZYSB : 0) |
  99                        (xfs_sb_version_hasattr2(&mp->m_sb) ?
 100                                XFS_FSOP_GEOM_FLAGS_ATTR2 : 0) |
 101                        (xfs_sb_version_hasprojid32bit(&mp->m_sb) ?
 102                                XFS_FSOP_GEOM_FLAGS_PROJID32 : 0) |
 103                        (xfs_sb_version_hascrc(&mp->m_sb) ?
 104                                XFS_FSOP_GEOM_FLAGS_V5SB : 0) |
 105                        (xfs_sb_version_hasftype(&mp->m_sb) ?
 106                                XFS_FSOP_GEOM_FLAGS_FTYPE : 0) |
 107                        (xfs_sb_version_hasfinobt(&mp->m_sb) ?
 108                                XFS_FSOP_GEOM_FLAGS_FINOBT : 0) |
 109                        (xfs_sb_version_hassparseinodes(&mp->m_sb) ?
 110                                XFS_FSOP_GEOM_FLAGS_SPINODES : 0) |
 111                        (xfs_sb_version_hasrmapbt(&mp->m_sb) ?
 112                                XFS_FSOP_GEOM_FLAGS_RMAPBT : 0) |
 113                        (xfs_sb_version_hasreflink(&mp->m_sb) ?
 114                                XFS_FSOP_GEOM_FLAGS_REFLINK : 0);
 115                geo->logsectsize = xfs_sb_version_hassector(&mp->m_sb) ?
 116                                mp->m_sb.sb_logsectsize : BBSIZE;
 117                geo->rtsectsize = mp->m_sb.sb_blocksize;
 118                geo->dirblocksize = mp->m_dir_geo->blksize;
 119        }
 120        if (new_version >= 4) {
 121                geo->flags |=
 122                        (xfs_sb_version_haslogv2(&mp->m_sb) ?
 123                                XFS_FSOP_GEOM_FLAGS_LOGV2 : 0);
 124                geo->logsunit = mp->m_sb.sb_logsunit;
 125        }
 126        return 0;
 127}
 128
 129static struct xfs_buf *
 130xfs_growfs_get_hdr_buf(
 131        struct xfs_mount        *mp,
 132        xfs_daddr_t             blkno,
 133        size_t                  numblks,
 134        int                     flags,
 135        const struct xfs_buf_ops *ops)
 136{
 137        struct xfs_buf          *bp;
 138
 139        bp = xfs_buf_get_uncached(mp->m_ddev_targp, numblks, flags);
 140        if (!bp)
 141                return NULL;
 142
 143        xfs_buf_zero(bp, 0, BBTOB(bp->b_length));
 144        bp->b_bn = blkno;
 145        bp->b_maps[0].bm_bn = blkno;
 146        bp->b_ops = ops;
 147
 148        return bp;
 149}
 150
 151static int
 152xfs_growfs_data_private(
 153        xfs_mount_t             *mp,            /* mount point for filesystem */
 154        xfs_growfs_data_t       *in)            /* growfs data input struct */
 155{
 156        xfs_agf_t               *agf;
 157        struct xfs_agfl         *agfl;
 158        xfs_agi_t               *agi;
 159        xfs_agnumber_t          agno;
 160        xfs_extlen_t            agsize;
 161        xfs_extlen_t            tmpsize;
 162        xfs_alloc_rec_t         *arec;
 163        xfs_buf_t               *bp;
 164        int                     bucket;
 165        int                     dpct;
 166        int                     error, saved_error = 0;
 167        xfs_agnumber_t          nagcount;
 168        xfs_agnumber_t          nagimax = 0;
 169        xfs_rfsblock_t          nb, nb_mod;
 170        xfs_rfsblock_t          new;
 171        xfs_rfsblock_t          nfree;
 172        xfs_agnumber_t          oagcount;
 173        int                     pct;
 174        xfs_trans_t             *tp;
 175
 176        nb = in->newblocks;
 177        pct = in->imaxpct;
 178        if (nb < mp->m_sb.sb_dblocks || pct < 0 || pct > 100)
 179                return -EINVAL;
 180        if ((error = xfs_sb_validate_fsb_count(&mp->m_sb, nb)))
 181                return error;
 182        dpct = pct - mp->m_sb.sb_imax_pct;
 183        error = xfs_buf_read_uncached(mp->m_ddev_targp,
 184                                XFS_FSB_TO_BB(mp, nb) - XFS_FSS_TO_BB(mp, 1),
 185                                XFS_FSS_TO_BB(mp, 1), 0, &bp, NULL);
 186        if (error)
 187                return error;
 188        xfs_buf_relse(bp);
 189
 190        new = nb;       /* use new as a temporary here */
 191        nb_mod = do_div(new, mp->m_sb.sb_agblocks);
 192        nagcount = new + (nb_mod != 0);
 193        if (nb_mod && nb_mod < XFS_MIN_AG_BLOCKS) {
 194                nagcount--;
 195                nb = (xfs_rfsblock_t)nagcount * mp->m_sb.sb_agblocks;
 196                if (nb < mp->m_sb.sb_dblocks)
 197                        return -EINVAL;
 198        }
 199        new = nb - mp->m_sb.sb_dblocks;
 200        oagcount = mp->m_sb.sb_agcount;
 201
 202        /* allocate the new per-ag structures */
 203        if (nagcount > oagcount) {
 204                error = xfs_initialize_perag(mp, nagcount, &nagimax);
 205                if (error)
 206                        return error;
 207        }
 208
 209        error = xfs_trans_alloc(mp, &M_RES(mp)->tr_growdata,
 210                        XFS_GROWFS_SPACE_RES(mp), 0, XFS_TRANS_RESERVE, &tp);
 211        if (error)
 212                return error;
 213
 214        /*
 215         * Write new AG headers to disk. Non-transactional, but written
 216         * synchronously so they are completed prior to the growfs transaction
 217         * being logged.
 218         */
 219        nfree = 0;
 220        for (agno = nagcount - 1; agno >= oagcount; agno--, new -= agsize) {
 221                __be32  *agfl_bno;
 222
 223                /*
 224                 * AG freespace header block
 225                 */
 226                bp = xfs_growfs_get_hdr_buf(mp,
 227                                XFS_AG_DADDR(mp, agno, XFS_AGF_DADDR(mp)),
 228                                XFS_FSS_TO_BB(mp, 1), 0,
 229                                &xfs_agf_buf_ops);
 230                if (!bp) {
 231                        error = -ENOMEM;
 232                        goto error0;
 233                }
 234
 235                agf = XFS_BUF_TO_AGF(bp);
 236                agf->agf_magicnum = cpu_to_be32(XFS_AGF_MAGIC);
 237                agf->agf_versionnum = cpu_to_be32(XFS_AGF_VERSION);
 238                agf->agf_seqno = cpu_to_be32(agno);
 239                if (agno == nagcount - 1)
 240                        agsize =
 241                                nb -
 242                                (agno * (xfs_rfsblock_t)mp->m_sb.sb_agblocks);
 243                else
 244                        agsize = mp->m_sb.sb_agblocks;
 245                agf->agf_length = cpu_to_be32(agsize);
 246                agf->agf_roots[XFS_BTNUM_BNOi] = cpu_to_be32(XFS_BNO_BLOCK(mp));
 247                agf->agf_roots[XFS_BTNUM_CNTi] = cpu_to_be32(XFS_CNT_BLOCK(mp));
 248                agf->agf_levels[XFS_BTNUM_BNOi] = cpu_to_be32(1);
 249                agf->agf_levels[XFS_BTNUM_CNTi] = cpu_to_be32(1);
 250                if (xfs_sb_version_hasrmapbt(&mp->m_sb)) {
 251                        agf->agf_roots[XFS_BTNUM_RMAPi] =
 252                                                cpu_to_be32(XFS_RMAP_BLOCK(mp));
 253                        agf->agf_levels[XFS_BTNUM_RMAPi] = cpu_to_be32(1);
 254                        agf->agf_rmap_blocks = cpu_to_be32(1);
 255                }
 256
 257                agf->agf_flfirst = cpu_to_be32(1);
 258                agf->agf_fllast = 0;
 259                agf->agf_flcount = 0;
 260                tmpsize = agsize - mp->m_ag_prealloc_blocks;
 261                agf->agf_freeblks = cpu_to_be32(tmpsize);
 262                agf->agf_longest = cpu_to_be32(tmpsize);
 263                if (xfs_sb_version_hascrc(&mp->m_sb))
 264                        uuid_copy(&agf->agf_uuid, &mp->m_sb.sb_meta_uuid);
 265                if (xfs_sb_version_hasreflink(&mp->m_sb)) {
 266                        agf->agf_refcount_root = cpu_to_be32(
 267                                        xfs_refc_block(mp));
 268                        agf->agf_refcount_level = cpu_to_be32(1);
 269                        agf->agf_refcount_blocks = cpu_to_be32(1);
 270                }
 271
 272                error = xfs_bwrite(bp);
 273                xfs_buf_relse(bp);
 274                if (error)
 275                        goto error0;
 276
 277                /*
 278                 * AG freelist header block
 279                 */
 280                bp = xfs_growfs_get_hdr_buf(mp,
 281                                XFS_AG_DADDR(mp, agno, XFS_AGFL_DADDR(mp)),
 282                                XFS_FSS_TO_BB(mp, 1), 0,
 283                                &xfs_agfl_buf_ops);
 284                if (!bp) {
 285                        error = -ENOMEM;
 286                        goto error0;
 287                }
 288
 289                agfl = XFS_BUF_TO_AGFL(bp);
 290                if (xfs_sb_version_hascrc(&mp->m_sb)) {
 291                        agfl->agfl_magicnum = cpu_to_be32(XFS_AGFL_MAGIC);
 292                        agfl->agfl_seqno = cpu_to_be32(agno);
 293                        uuid_copy(&agfl->agfl_uuid, &mp->m_sb.sb_meta_uuid);
 294                }
 295
 296                agfl_bno = XFS_BUF_TO_AGFL_BNO(mp, bp);
 297                for (bucket = 0; bucket < XFS_AGFL_SIZE(mp); bucket++)
 298                        agfl_bno[bucket] = cpu_to_be32(NULLAGBLOCK);
 299
 300                error = xfs_bwrite(bp);
 301                xfs_buf_relse(bp);
 302                if (error)
 303                        goto error0;
 304
 305                /*
 306                 * AG inode header block
 307                 */
 308                bp = xfs_growfs_get_hdr_buf(mp,
 309                                XFS_AG_DADDR(mp, agno, XFS_AGI_DADDR(mp)),
 310                                XFS_FSS_TO_BB(mp, 1), 0,
 311                                &xfs_agi_buf_ops);
 312                if (!bp) {
 313                        error = -ENOMEM;
 314                        goto error0;
 315                }
 316
 317                agi = XFS_BUF_TO_AGI(bp);
 318                agi->agi_magicnum = cpu_to_be32(XFS_AGI_MAGIC);
 319                agi->agi_versionnum = cpu_to_be32(XFS_AGI_VERSION);
 320                agi->agi_seqno = cpu_to_be32(agno);
 321                agi->agi_length = cpu_to_be32(agsize);
 322                agi->agi_count = 0;
 323                agi->agi_root = cpu_to_be32(XFS_IBT_BLOCK(mp));
 324                agi->agi_level = cpu_to_be32(1);
 325                agi->agi_freecount = 0;
 326                agi->agi_newino = cpu_to_be32(NULLAGINO);
 327                agi->agi_dirino = cpu_to_be32(NULLAGINO);
 328                if (xfs_sb_version_hascrc(&mp->m_sb))
 329                        uuid_copy(&agi->agi_uuid, &mp->m_sb.sb_meta_uuid);
 330                if (xfs_sb_version_hasfinobt(&mp->m_sb)) {
 331                        agi->agi_free_root = cpu_to_be32(XFS_FIBT_BLOCK(mp));
 332                        agi->agi_free_level = cpu_to_be32(1);
 333                }
 334                for (bucket = 0; bucket < XFS_AGI_UNLINKED_BUCKETS; bucket++)
 335                        agi->agi_unlinked[bucket] = cpu_to_be32(NULLAGINO);
 336
 337                error = xfs_bwrite(bp);
 338                xfs_buf_relse(bp);
 339                if (error)
 340                        goto error0;
 341
 342                /*
 343                 * BNO btree root block
 344                 */
 345                bp = xfs_growfs_get_hdr_buf(mp,
 346                                XFS_AGB_TO_DADDR(mp, agno, XFS_BNO_BLOCK(mp)),
 347                                BTOBB(mp->m_sb.sb_blocksize), 0,
 348                                &xfs_allocbt_buf_ops);
 349
 350                if (!bp) {
 351                        error = -ENOMEM;
 352                        goto error0;
 353                }
 354
 355                xfs_btree_init_block(mp, bp, XFS_BTNUM_BNO, 0, 1, agno, 0);
 356
 357                arec = XFS_ALLOC_REC_ADDR(mp, XFS_BUF_TO_BLOCK(bp), 1);
 358                arec->ar_startblock = cpu_to_be32(mp->m_ag_prealloc_blocks);
 359                arec->ar_blockcount = cpu_to_be32(
 360                        agsize - be32_to_cpu(arec->ar_startblock));
 361
 362                error = xfs_bwrite(bp);
 363                xfs_buf_relse(bp);
 364                if (error)
 365                        goto error0;
 366
 367                /*
 368                 * CNT btree root block
 369                 */
 370                bp = xfs_growfs_get_hdr_buf(mp,
 371                                XFS_AGB_TO_DADDR(mp, agno, XFS_CNT_BLOCK(mp)),
 372                                BTOBB(mp->m_sb.sb_blocksize), 0,
 373                                &xfs_allocbt_buf_ops);
 374                if (!bp) {
 375                        error = -ENOMEM;
 376                        goto error0;
 377                }
 378
 379                xfs_btree_init_block(mp, bp, XFS_BTNUM_CNT, 0, 1, agno, 0);
 380
 381                arec = XFS_ALLOC_REC_ADDR(mp, XFS_BUF_TO_BLOCK(bp), 1);
 382                arec->ar_startblock = cpu_to_be32(mp->m_ag_prealloc_blocks);
 383                arec->ar_blockcount = cpu_to_be32(
 384                        agsize - be32_to_cpu(arec->ar_startblock));
 385                nfree += be32_to_cpu(arec->ar_blockcount);
 386
 387                error = xfs_bwrite(bp);
 388                xfs_buf_relse(bp);
 389                if (error)
 390                        goto error0;
 391
 392                /* RMAP btree root block */
 393                if (xfs_sb_version_hasrmapbt(&mp->m_sb)) {
 394                        struct xfs_rmap_rec     *rrec;
 395                        struct xfs_btree_block  *block;
 396
 397                        bp = xfs_growfs_get_hdr_buf(mp,
 398                                XFS_AGB_TO_DADDR(mp, agno, XFS_RMAP_BLOCK(mp)),
 399                                BTOBB(mp->m_sb.sb_blocksize), 0,
 400                                &xfs_rmapbt_buf_ops);
 401                        if (!bp) {
 402                                error = -ENOMEM;
 403                                goto error0;
 404                        }
 405
 406                        xfs_btree_init_block(mp, bp, XFS_BTNUM_RMAP, 0, 0,
 407                                                agno, 0);
 408                        block = XFS_BUF_TO_BLOCK(bp);
 409
 410
 411                        /*
 412                         * mark the AG header regions as static metadata The BNO
 413                         * btree block is the first block after the headers, so
 414                         * it's location defines the size of region the static
 415                         * metadata consumes.
 416                         *
 417                         * Note: unlike mkfs, we never have to account for log
 418                         * space when growing the data regions
 419                         */
 420                        rrec = XFS_RMAP_REC_ADDR(block, 1);
 421                        rrec->rm_startblock = 0;
 422                        rrec->rm_blockcount = cpu_to_be32(XFS_BNO_BLOCK(mp));
 423                        rrec->rm_owner = cpu_to_be64(XFS_RMAP_OWN_FS);
 424                        rrec->rm_offset = 0;
 425                        be16_add_cpu(&block->bb_numrecs, 1);
 426
 427                        /* account freespace btree root blocks */
 428                        rrec = XFS_RMAP_REC_ADDR(block, 2);
 429                        rrec->rm_startblock = cpu_to_be32(XFS_BNO_BLOCK(mp));
 430                        rrec->rm_blockcount = cpu_to_be32(2);
 431                        rrec->rm_owner = cpu_to_be64(XFS_RMAP_OWN_AG);
 432                        rrec->rm_offset = 0;
 433                        be16_add_cpu(&block->bb_numrecs, 1);
 434
 435                        /* account inode btree root blocks */
 436                        rrec = XFS_RMAP_REC_ADDR(block, 3);
 437                        rrec->rm_startblock = cpu_to_be32(XFS_IBT_BLOCK(mp));
 438                        rrec->rm_blockcount = cpu_to_be32(XFS_RMAP_BLOCK(mp) -
 439                                                        XFS_IBT_BLOCK(mp));
 440                        rrec->rm_owner = cpu_to_be64(XFS_RMAP_OWN_INOBT);
 441                        rrec->rm_offset = 0;
 442                        be16_add_cpu(&block->bb_numrecs, 1);
 443
 444                        /* account for rmap btree root */
 445                        rrec = XFS_RMAP_REC_ADDR(block, 4);
 446                        rrec->rm_startblock = cpu_to_be32(XFS_RMAP_BLOCK(mp));
 447                        rrec->rm_blockcount = cpu_to_be32(1);
 448                        rrec->rm_owner = cpu_to_be64(XFS_RMAP_OWN_AG);
 449                        rrec->rm_offset = 0;
 450                        be16_add_cpu(&block->bb_numrecs, 1);
 451
 452                        /* account for refc btree root */
 453                        if (xfs_sb_version_hasreflink(&mp->m_sb)) {
 454                                rrec = XFS_RMAP_REC_ADDR(block, 5);
 455                                rrec->rm_startblock = cpu_to_be32(
 456                                                xfs_refc_block(mp));
 457                                rrec->rm_blockcount = cpu_to_be32(1);
 458                                rrec->rm_owner = cpu_to_be64(XFS_RMAP_OWN_REFC);
 459                                rrec->rm_offset = 0;
 460                                be16_add_cpu(&block->bb_numrecs, 1);
 461                        }
 462
 463                        error = xfs_bwrite(bp);
 464                        xfs_buf_relse(bp);
 465                        if (error)
 466                                goto error0;
 467                }
 468
 469                /*
 470                 * INO btree root block
 471                 */
 472                bp = xfs_growfs_get_hdr_buf(mp,
 473                                XFS_AGB_TO_DADDR(mp, agno, XFS_IBT_BLOCK(mp)),
 474                                BTOBB(mp->m_sb.sb_blocksize), 0,
 475                                &xfs_inobt_buf_ops);
 476                if (!bp) {
 477                        error = -ENOMEM;
 478                        goto error0;
 479                }
 480
 481                xfs_btree_init_block(mp, bp, XFS_BTNUM_INO , 0, 0, agno, 0);
 482
 483                error = xfs_bwrite(bp);
 484                xfs_buf_relse(bp);
 485                if (error)
 486                        goto error0;
 487
 488                /*
 489                 * FINO btree root block
 490                 */
 491                if (xfs_sb_version_hasfinobt(&mp->m_sb)) {
 492                        bp = xfs_growfs_get_hdr_buf(mp,
 493                                XFS_AGB_TO_DADDR(mp, agno, XFS_FIBT_BLOCK(mp)),
 494                                BTOBB(mp->m_sb.sb_blocksize), 0,
 495                                &xfs_inobt_buf_ops);
 496                        if (!bp) {
 497                                error = -ENOMEM;
 498                                goto error0;
 499                        }
 500
 501                        xfs_btree_init_block(mp, bp, XFS_BTNUM_FINO,
 502                                                     0, 0, agno, 0);
 503
 504                        error = xfs_bwrite(bp);
 505                        xfs_buf_relse(bp);
 506                        if (error)
 507                                goto error0;
 508                }
 509
 510                /*
 511                 * refcount btree root block
 512                 */
 513                if (xfs_sb_version_hasreflink(&mp->m_sb)) {
 514                        bp = xfs_growfs_get_hdr_buf(mp,
 515                                XFS_AGB_TO_DADDR(mp, agno, xfs_refc_block(mp)),
 516                                BTOBB(mp->m_sb.sb_blocksize), 0,
 517                                &xfs_refcountbt_buf_ops);
 518                        if (!bp) {
 519                                error = -ENOMEM;
 520                                goto error0;
 521                        }
 522
 523                        xfs_btree_init_block(mp, bp, XFS_BTNUM_REFC,
 524                                             0, 0, agno, 0);
 525
 526                        error = xfs_bwrite(bp);
 527                        xfs_buf_relse(bp);
 528                        if (error)
 529                                goto error0;
 530                }
 531        }
 532        xfs_trans_agblocks_delta(tp, nfree);
 533        /*
 534         * There are new blocks in the old last a.g.
 535         */
 536        if (new) {
 537                struct xfs_owner_info   oinfo;
 538
 539                /*
 540                 * Change the agi length.
 541                 */
 542                error = xfs_ialloc_read_agi(mp, tp, agno, &bp);
 543                if (error) {
 544                        goto error0;
 545                }
 546                ASSERT(bp);
 547                agi = XFS_BUF_TO_AGI(bp);
 548                be32_add_cpu(&agi->agi_length, new);
 549                ASSERT(nagcount == oagcount ||
 550                       be32_to_cpu(agi->agi_length) == mp->m_sb.sb_agblocks);
 551                xfs_ialloc_log_agi(tp, bp, XFS_AGI_LENGTH);
 552                /*
 553                 * Change agf length.
 554                 */
 555                error = xfs_alloc_read_agf(mp, tp, agno, 0, &bp);
 556                if (error) {
 557                        goto error0;
 558                }
 559                ASSERT(bp);
 560                agf = XFS_BUF_TO_AGF(bp);
 561                be32_add_cpu(&agf->agf_length, new);
 562                ASSERT(be32_to_cpu(agf->agf_length) ==
 563                       be32_to_cpu(agi->agi_length));
 564
 565                xfs_alloc_log_agf(tp, bp, XFS_AGF_LENGTH);
 566
 567                /*
 568                 * Free the new space.
 569                 *
 570                 * XFS_RMAP_OWN_NULL is used here to tell the rmap btree that
 571                 * this doesn't actually exist in the rmap btree.
 572                 */
 573                xfs_rmap_ag_owner(&oinfo, XFS_RMAP_OWN_NULL);
 574                error = xfs_free_extent(tp,
 575                                XFS_AGB_TO_FSB(mp, agno,
 576                                        be32_to_cpu(agf->agf_length) - new),
 577                                new, &oinfo, XFS_AG_RESV_NONE);
 578                if (error)
 579                        goto error0;
 580        }
 581
 582        /*
 583         * Update changed superblock fields transactionally. These are not
 584         * seen by the rest of the world until the transaction commit applies
 585         * them atomically to the superblock.
 586         */
 587        if (nagcount > oagcount)
 588                xfs_trans_mod_sb(tp, XFS_TRANS_SB_AGCOUNT, nagcount - oagcount);
 589        if (nb > mp->m_sb.sb_dblocks)
 590                xfs_trans_mod_sb(tp, XFS_TRANS_SB_DBLOCKS,
 591                                 nb - mp->m_sb.sb_dblocks);
 592        if (nfree)
 593                xfs_trans_mod_sb(tp, XFS_TRANS_SB_FDBLOCKS, nfree);
 594        if (dpct)
 595                xfs_trans_mod_sb(tp, XFS_TRANS_SB_IMAXPCT, dpct);
 596        xfs_trans_set_sync(tp);
 597        error = xfs_trans_commit(tp);
 598        if (error)
 599                return error;
 600
 601        /* New allocation groups fully initialized, so update mount struct */
 602        if (nagimax)
 603                mp->m_maxagi = nagimax;
 604        if (mp->m_sb.sb_imax_pct) {
 605                uint64_t icount = mp->m_sb.sb_dblocks * mp->m_sb.sb_imax_pct;
 606                do_div(icount, 100);
 607                mp->m_maxicount = icount << mp->m_sb.sb_inopblog;
 608        } else
 609                mp->m_maxicount = 0;
 610        xfs_set_low_space_thresholds(mp);
 611        mp->m_alloc_set_aside = xfs_alloc_set_aside(mp);
 612
 613        /*
 614         * If we expanded the last AG, free the per-AG reservation
 615         * so we can reinitialize it with the new size.
 616         */
 617        if (new) {
 618                struct xfs_perag        *pag;
 619
 620                pag = xfs_perag_get(mp, agno);
 621                error = xfs_ag_resv_free(pag);
 622                xfs_perag_put(pag);
 623                if (error)
 624                        goto out;
 625        }
 626
 627        /* Reserve AG metadata blocks. */
 628        error = xfs_fs_reserve_ag_blocks(mp);
 629        if (error && error != -ENOSPC)
 630                goto out;
 631
 632        /* update secondary superblocks. */
 633        for (agno = 1; agno < nagcount; agno++) {
 634                error = 0;
 635                /*
 636                 * new secondary superblocks need to be zeroed, not read from
 637                 * disk as the contents of the new area we are growing into is
 638                 * completely unknown.
 639                 */
 640                if (agno < oagcount) {
 641                        error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp,
 642                                  XFS_AGB_TO_DADDR(mp, agno, XFS_SB_BLOCK(mp)),
 643                                  XFS_FSS_TO_BB(mp, 1), 0, &bp,
 644                                  &xfs_sb_buf_ops);
 645                } else {
 646                        bp = xfs_trans_get_buf(NULL, mp->m_ddev_targp,
 647                                  XFS_AGB_TO_DADDR(mp, agno, XFS_SB_BLOCK(mp)),
 648                                  XFS_FSS_TO_BB(mp, 1), 0);
 649                        if (bp) {
 650                                bp->b_ops = &xfs_sb_buf_ops;
 651                                xfs_buf_zero(bp, 0, BBTOB(bp->b_length));
 652                        } else
 653                                error = -ENOMEM;
 654                }
 655
 656                /*
 657                 * If we get an error reading or writing alternate superblocks,
 658                 * continue.  xfs_repair chooses the "best" superblock based
 659                 * on most matches; if we break early, we'll leave more
 660                 * superblocks un-updated than updated, and xfs_repair may
 661                 * pick them over the properly-updated primary.
 662                 */
 663                if (error) {
 664                        xfs_warn(mp,
 665                "error %d reading secondary superblock for ag %d",
 666                                error, agno);
 667                        saved_error = error;
 668                        continue;
 669                }
 670                xfs_sb_to_disk(XFS_BUF_TO_SBP(bp), &mp->m_sb);
 671
 672                error = xfs_bwrite(bp);
 673                xfs_buf_relse(bp);
 674                if (error) {
 675                        xfs_warn(mp,
 676                "write error %d updating secondary superblock for ag %d",
 677                                error, agno);
 678                        saved_error = error;
 679                        continue;
 680                }
 681        }
 682
 683 out:
 684        return saved_error ? saved_error : error;
 685
 686 error0:
 687        xfs_trans_cancel(tp);
 688        return error;
 689}
 690
 691static int
 692xfs_growfs_log_private(
 693        xfs_mount_t             *mp,    /* mount point for filesystem */
 694        xfs_growfs_log_t        *in)    /* growfs log input struct */
 695{
 696        xfs_extlen_t            nb;
 697
 698        nb = in->newblocks;
 699        if (nb < XFS_MIN_LOG_BLOCKS || nb < XFS_B_TO_FSB(mp, XFS_MIN_LOG_BYTES))
 700                return -EINVAL;
 701        if (nb == mp->m_sb.sb_logblocks &&
 702            in->isint == (mp->m_sb.sb_logstart != 0))
 703                return -EINVAL;
 704        /*
 705         * Moving the log is hard, need new interfaces to sync
 706         * the log first, hold off all activity while moving it.
 707         * Can have shorter or longer log in the same space,
 708         * or transform internal to external log or vice versa.
 709         */
 710        return -ENOSYS;
 711}
 712
 713/*
 714 * protected versions of growfs function acquire and release locks on the mount
 715 * point - exported through ioctls: XFS_IOC_FSGROWFSDATA, XFS_IOC_FSGROWFSLOG,
 716 * XFS_IOC_FSGROWFSRT
 717 */
 718
 719
 720int
 721xfs_growfs_data(
 722        xfs_mount_t             *mp,
 723        xfs_growfs_data_t       *in)
 724{
 725        int error;
 726
 727        if (!capable(CAP_SYS_ADMIN))
 728                return -EPERM;
 729        if (!mutex_trylock(&mp->m_growlock))
 730                return -EWOULDBLOCK;
 731        error = xfs_growfs_data_private(mp, in);
 732        /*
 733         * Increment the generation unconditionally, the error could be from
 734         * updating the secondary superblocks, in which case the new size
 735         * is live already.
 736         */
 737        mp->m_generation++;
 738        mutex_unlock(&mp->m_growlock);
 739        return error;
 740}
 741
 742int
 743xfs_growfs_log(
 744        xfs_mount_t             *mp,
 745        xfs_growfs_log_t        *in)
 746{
 747        int error;
 748
 749        if (!capable(CAP_SYS_ADMIN))
 750                return -EPERM;
 751        if (!mutex_trylock(&mp->m_growlock))
 752                return -EWOULDBLOCK;
 753        error = xfs_growfs_log_private(mp, in);
 754        mutex_unlock(&mp->m_growlock);
 755        return error;
 756}
 757
 758/*
 759 * exported through ioctl XFS_IOC_FSCOUNTS
 760 */
 761
 762int
 763xfs_fs_counts(
 764        xfs_mount_t             *mp,
 765        xfs_fsop_counts_t       *cnt)
 766{
 767        cnt->allocino = percpu_counter_read_positive(&mp->m_icount);
 768        cnt->freeino = percpu_counter_read_positive(&mp->m_ifree);
 769        cnt->freedata = percpu_counter_read_positive(&mp->m_fdblocks) -
 770                                                mp->m_alloc_set_aside;
 771
 772        spin_lock(&mp->m_sb_lock);
 773        cnt->freertx = mp->m_sb.sb_frextents;
 774        spin_unlock(&mp->m_sb_lock);
 775        return 0;
 776}
 777
 778/*
 779 * exported through ioctl XFS_IOC_SET_RESBLKS & XFS_IOC_GET_RESBLKS
 780 *
 781 * xfs_reserve_blocks is called to set m_resblks
 782 * in the in-core mount table. The number of unused reserved blocks
 783 * is kept in m_resblks_avail.
 784 *
 785 * Reserve the requested number of blocks if available. Otherwise return
 786 * as many as possible to satisfy the request. The actual number
 787 * reserved are returned in outval
 788 *
 789 * A null inval pointer indicates that only the current reserved blocks
 790 * available  should  be returned no settings are changed.
 791 */
 792
 793int
 794xfs_reserve_blocks(
 795        xfs_mount_t             *mp,
 796        uint64_t              *inval,
 797        xfs_fsop_resblks_t      *outval)
 798{
 799        int64_t                 lcounter, delta;
 800        int64_t                 fdblks_delta = 0;
 801        uint64_t                request;
 802        int64_t                 free;
 803        int                     error = 0;
 804
 805        /* If inval is null, report current values and return */
 806        if (inval == (uint64_t *)NULL) {
 807                if (!outval)
 808                        return -EINVAL;
 809                outval->resblks = mp->m_resblks;
 810                outval->resblks_avail = mp->m_resblks_avail;
 811                return 0;
 812        }
 813
 814        request = *inval;
 815
 816        /*
 817         * With per-cpu counters, this becomes an interesting problem. we need
 818         * to work out if we are freeing or allocation blocks first, then we can
 819         * do the modification as necessary.
 820         *
 821         * We do this under the m_sb_lock so that if we are near ENOSPC, we will
 822         * hold out any changes while we work out what to do. This means that
 823         * the amount of free space can change while we do this, so we need to
 824         * retry if we end up trying to reserve more space than is available.
 825         */
 826        spin_lock(&mp->m_sb_lock);
 827
 828        /*
 829         * If our previous reservation was larger than the current value,
 830         * then move any unused blocks back to the free pool. Modify the resblks
 831         * counters directly since we shouldn't have any problems unreserving
 832         * space.
 833         */
 834        if (mp->m_resblks > request) {
 835                lcounter = mp->m_resblks_avail - request;
 836                if (lcounter  > 0) {            /* release unused blocks */
 837                        fdblks_delta = lcounter;
 838                        mp->m_resblks_avail -= lcounter;
 839                }
 840                mp->m_resblks = request;
 841                if (fdblks_delta) {
 842                        spin_unlock(&mp->m_sb_lock);
 843                        error = xfs_mod_fdblocks(mp, fdblks_delta, 0);
 844                        spin_lock(&mp->m_sb_lock);
 845                }
 846
 847                goto out;
 848        }
 849
 850        /*
 851         * If the request is larger than the current reservation, reserve the
 852         * blocks before we update the reserve counters. Sample m_fdblocks and
 853         * perform a partial reservation if the request exceeds free space.
 854         */
 855        error = -ENOSPC;
 856        do {
 857                free = percpu_counter_sum(&mp->m_fdblocks) -
 858                                                mp->m_alloc_set_aside;
 859                if (!free)
 860                        break;
 861
 862                delta = request - mp->m_resblks;
 863                lcounter = free - delta;
 864                if (lcounter < 0)
 865                        /* We can't satisfy the request, just get what we can */
 866                        fdblks_delta = free;
 867                else
 868                        fdblks_delta = delta;
 869
 870                /*
 871                 * We'll either succeed in getting space from the free block
 872                 * count or we'll get an ENOSPC. If we get a ENOSPC, it means
 873                 * things changed while we were calculating fdblks_delta and so
 874                 * we should try again to see if there is anything left to
 875                 * reserve.
 876                 *
 877                 * Don't set the reserved flag here - we don't want to reserve
 878                 * the extra reserve blocks from the reserve.....
 879                 */
 880                spin_unlock(&mp->m_sb_lock);
 881                error = xfs_mod_fdblocks(mp, -fdblks_delta, 0);
 882                spin_lock(&mp->m_sb_lock);
 883        } while (error == -ENOSPC);
 884
 885        /*
 886         * Update the reserve counters if blocks have been successfully
 887         * allocated.
 888         */
 889        if (!error && fdblks_delta) {
 890                mp->m_resblks += fdblks_delta;
 891                mp->m_resblks_avail += fdblks_delta;
 892        }
 893
 894out:
 895        if (outval) {
 896                outval->resblks = mp->m_resblks;
 897                outval->resblks_avail = mp->m_resblks_avail;
 898        }
 899
 900        spin_unlock(&mp->m_sb_lock);
 901        return error;
 902}
 903
 904int
 905xfs_fs_goingdown(
 906        xfs_mount_t     *mp,
 907        uint32_t        inflags)
 908{
 909        switch (inflags) {
 910        case XFS_FSOP_GOING_FLAGS_DEFAULT: {
 911                struct super_block *sb = freeze_bdev(mp->m_super->s_bdev);
 912
 913                if (sb && !IS_ERR(sb)) {
 914                        xfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT);
 915                        thaw_bdev(sb->s_bdev, sb);
 916                }
 917
 918                break;
 919        }
 920        case XFS_FSOP_GOING_FLAGS_LOGFLUSH:
 921                xfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT);
 922                break;
 923        case XFS_FSOP_GOING_FLAGS_NOLOGFLUSH:
 924                xfs_force_shutdown(mp,
 925                                SHUTDOWN_FORCE_UMOUNT | SHUTDOWN_LOG_IO_ERROR);
 926                break;
 927        default:
 928                return -EINVAL;
 929        }
 930
 931        return 0;
 932}
 933
 934/*
 935 * Force a shutdown of the filesystem instantly while keeping the filesystem
 936 * consistent. We don't do an unmount here; just shutdown the shop, make sure
 937 * that absolutely nothing persistent happens to this filesystem after this
 938 * point.
 939 */
 940void
 941xfs_do_force_shutdown(
 942        xfs_mount_t     *mp,
 943        int             flags,
 944        char            *fname,
 945        int             lnnum)
 946{
 947        int             logerror;
 948
 949        logerror = flags & SHUTDOWN_LOG_IO_ERROR;
 950
 951        if (!(flags & SHUTDOWN_FORCE_UMOUNT)) {
 952                xfs_notice(mp,
 953        "%s(0x%x) called from line %d of file %s.  Return address = 0x%p",
 954                        __func__, flags, lnnum, fname, __return_address);
 955        }
 956        /*
 957         * No need to duplicate efforts.
 958         */
 959        if (XFS_FORCED_SHUTDOWN(mp) && !logerror)
 960                return;
 961
 962        /*
 963         * This flags XFS_MOUNT_FS_SHUTDOWN, makes sure that we don't
 964         * queue up anybody new on the log reservations, and wakes up
 965         * everybody who's sleeping on log reservations to tell them
 966         * the bad news.
 967         */
 968        if (xfs_log_force_umount(mp, logerror))
 969                return;
 970
 971        if (flags & SHUTDOWN_CORRUPT_INCORE) {
 972                xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_CORRUPT,
 973    "Corruption of in-memory data detected.  Shutting down filesystem");
 974                if (XFS_ERRLEVEL_HIGH <= xfs_error_level)
 975                        xfs_stack_trace();
 976        } else if (!(flags & SHUTDOWN_FORCE_UMOUNT)) {
 977                if (logerror) {
 978                        xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_LOGERROR,
 979                "Log I/O Error Detected.  Shutting down filesystem");
 980                } else if (flags & SHUTDOWN_DEVICE_REQ) {
 981                        xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_IOERROR,
 982                "All device paths lost.  Shutting down filesystem");
 983                } else if (!(flags & SHUTDOWN_REMOTE_REQ)) {
 984                        xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_IOERROR,
 985                "I/O Error Detected. Shutting down filesystem");
 986                }
 987        }
 988        if (!(flags & SHUTDOWN_FORCE_UMOUNT)) {
 989                xfs_alert(mp,
 990        "Please umount the filesystem and rectify the problem(s)");
 991        }
 992}
 993
 994/*
 995 * Reserve free space for per-AG metadata.
 996 */
 997int
 998xfs_fs_reserve_ag_blocks(
 999        struct xfs_mount        *mp)
1000{
1001        xfs_agnumber_t          agno;
1002        struct xfs_perag        *pag;
1003        int                     error = 0;
1004        int                     err2;
1005
1006        for (agno = 0; agno < mp->m_sb.sb_agcount; agno++) {
1007                pag = xfs_perag_get(mp, agno);
1008                err2 = xfs_ag_resv_init(pag);
1009                xfs_perag_put(pag);
1010                if (err2 && !error)
1011                        error = err2;
1012        }
1013
1014        if (error && error != -ENOSPC) {
1015                xfs_warn(mp,
1016        "Error %d reserving per-AG metadata reserve pool.", error);
1017                xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
1018        }
1019
1020        return error;
1021}
1022
1023/*
1024 * Free space reserved for per-AG metadata.
1025 */
1026int
1027xfs_fs_unreserve_ag_blocks(
1028        struct xfs_mount        *mp)
1029{
1030        xfs_agnumber_t          agno;
1031        struct xfs_perag        *pag;
1032        int                     error = 0;
1033        int                     err2;
1034
1035        for (agno = 0; agno < mp->m_sb.sb_agcount; agno++) {
1036                pag = xfs_perag_get(mp, agno);
1037                err2 = xfs_ag_resv_free(pag);
1038                xfs_perag_put(pag);
1039                if (err2 && !error)
1040                        error = err2;
1041        }
1042
1043        if (error)
1044                xfs_warn(mp,
1045        "Error %d freeing per-AG metadata reserve pool.", error);
1046
1047        return error;
1048}
1049