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_types.h"
  21#include "xfs_log.h"
  22#include "xfs_trans.h"
  23#include "xfs_sb.h"
  24#include "xfs_ag.h"
  25#include "xfs_mount.h"
  26#include "xfs_bmap_btree.h"
  27#include "xfs_alloc_btree.h"
  28#include "xfs_ialloc_btree.h"
  29#include "xfs_dinode.h"
  30#include "xfs_inode.h"
  31#include "xfs_inode_item.h"
  32#include "xfs_btree.h"
  33#include "xfs_error.h"
  34#include "xfs_alloc.h"
  35#include "xfs_ialloc.h"
  36#include "xfs_fsops.h"
  37#include "xfs_itable.h"
  38#include "xfs_trans_space.h"
  39#include "xfs_rtalloc.h"
  40#include "xfs_filestream.h"
  41#include "xfs_trace.h"
  42
  43/*
  44 * File system operations
  45 */
  46
  47int
  48xfs_fs_geometry(
  49        xfs_mount_t             *mp,
  50        xfs_fsop_geom_t         *geo,
  51        int                     new_version)
  52{
  53
  54        memset(geo, 0, sizeof(*geo));
  55
  56        geo->blocksize = mp->m_sb.sb_blocksize;
  57        geo->rtextsize = mp->m_sb.sb_rextsize;
  58        geo->agblocks = mp->m_sb.sb_agblocks;
  59        geo->agcount = mp->m_sb.sb_agcount;
  60        geo->logblocks = mp->m_sb.sb_logblocks;
  61        geo->sectsize = mp->m_sb.sb_sectsize;
  62        geo->inodesize = mp->m_sb.sb_inodesize;
  63        geo->imaxpct = mp->m_sb.sb_imax_pct;
  64        geo->datablocks = mp->m_sb.sb_dblocks;
  65        geo->rtblocks = mp->m_sb.sb_rblocks;
  66        geo->rtextents = mp->m_sb.sb_rextents;
  67        geo->logstart = mp->m_sb.sb_logstart;
  68        ASSERT(sizeof(geo->uuid)==sizeof(mp->m_sb.sb_uuid));
  69        memcpy(geo->uuid, &mp->m_sb.sb_uuid, sizeof(mp->m_sb.sb_uuid));
  70        if (new_version >= 2) {
  71                geo->sunit = mp->m_sb.sb_unit;
  72                geo->swidth = mp->m_sb.sb_width;
  73        }
  74        if (new_version >= 3) {
  75                geo->version = XFS_FSOP_GEOM_VERSION;
  76                geo->flags =
  77                        (xfs_sb_version_hasattr(&mp->m_sb) ?
  78                                XFS_FSOP_GEOM_FLAGS_ATTR : 0) |
  79                        (xfs_sb_version_hasnlink(&mp->m_sb) ?
  80                                XFS_FSOP_GEOM_FLAGS_NLINK : 0) |
  81                        (xfs_sb_version_hasquota(&mp->m_sb) ?
  82                                XFS_FSOP_GEOM_FLAGS_QUOTA : 0) |
  83                        (xfs_sb_version_hasalign(&mp->m_sb) ?
  84                                XFS_FSOP_GEOM_FLAGS_IALIGN : 0) |
  85                        (xfs_sb_version_hasdalign(&mp->m_sb) ?
  86                                XFS_FSOP_GEOM_FLAGS_DALIGN : 0) |
  87                        (xfs_sb_version_hasshared(&mp->m_sb) ?
  88                                XFS_FSOP_GEOM_FLAGS_SHARED : 0) |
  89                        (xfs_sb_version_hasextflgbit(&mp->m_sb) ?
  90                                XFS_FSOP_GEOM_FLAGS_EXTFLG : 0) |
  91                        (xfs_sb_version_hasdirv2(&mp->m_sb) ?
  92                                XFS_FSOP_GEOM_FLAGS_DIRV2 : 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                geo->logsectsize = xfs_sb_version_hassector(&mp->m_sb) ?
 106                                mp->m_sb.sb_logsectsize : BBSIZE;
 107                geo->rtsectsize = mp->m_sb.sb_blocksize;
 108                geo->dirblocksize = mp->m_dirblksize;
 109        }
 110        if (new_version >= 4) {
 111                geo->flags |=
 112                        (xfs_sb_version_haslogv2(&mp->m_sb) ?
 113                                XFS_FSOP_GEOM_FLAGS_LOGV2 : 0);
 114                geo->logsunit = mp->m_sb.sb_logsunit;
 115        }
 116        return 0;
 117}
 118
 119static struct xfs_buf *
 120xfs_growfs_get_hdr_buf(
 121        struct xfs_mount        *mp,
 122        xfs_daddr_t             blkno,
 123        size_t                  numblks,
 124        int                     flags,
 125        const struct xfs_buf_ops *ops)
 126{
 127        struct xfs_buf          *bp;
 128
 129        bp = xfs_buf_get_uncached(mp->m_ddev_targp, numblks, flags);
 130        if (!bp)
 131                return NULL;
 132
 133        xfs_buf_zero(bp, 0, BBTOB(bp->b_length));
 134        bp->b_bn = blkno;
 135        bp->b_maps[0].bm_bn = blkno;
 136        bp->b_ops = ops;
 137
 138        return bp;
 139}
 140
 141static int
 142xfs_growfs_data_private(
 143        xfs_mount_t             *mp,            /* mount point for filesystem */
 144        xfs_growfs_data_t       *in)            /* growfs data input struct */
 145{
 146        xfs_agf_t               *agf;
 147        struct xfs_agfl         *agfl;
 148        xfs_agi_t               *agi;
 149        xfs_agnumber_t          agno;
 150        xfs_extlen_t            agsize;
 151        xfs_extlen_t            tmpsize;
 152        xfs_alloc_rec_t         *arec;
 153        xfs_buf_t               *bp;
 154        int                     bucket;
 155        int                     dpct;
 156        int                     error;
 157        xfs_agnumber_t          nagcount;
 158        xfs_agnumber_t          nagimax = 0;
 159        xfs_rfsblock_t          nb, nb_mod;
 160        xfs_rfsblock_t          new;
 161        xfs_rfsblock_t          nfree;
 162        xfs_agnumber_t          oagcount;
 163        int                     pct;
 164        xfs_trans_t             *tp;
 165
 166        nb = in->newblocks;
 167        pct = in->imaxpct;
 168        if (nb < mp->m_sb.sb_dblocks || pct < 0 || pct > 100)
 169                return XFS_ERROR(EINVAL);
 170        if ((error = xfs_sb_validate_fsb_count(&mp->m_sb, nb)))
 171                return error;
 172        dpct = pct - mp->m_sb.sb_imax_pct;
 173        bp = xfs_buf_read_uncached(mp->m_ddev_targp,
 174                                XFS_FSB_TO_BB(mp, nb) - XFS_FSS_TO_BB(mp, 1),
 175                                XFS_FSS_TO_BB(mp, 1), 0, NULL);
 176        if (!bp)
 177                return EIO;
 178        if (bp->b_error) {
 179                error = bp->b_error;
 180                xfs_buf_relse(bp);
 181                return error;
 182        }
 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 XFS_ERROR(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        tp = xfs_trans_alloc(mp, XFS_TRANS_GROWFS);
 205        tp->t_flags |= XFS_TRANS_RESERVE;
 206        if ((error = xfs_trans_reserve(tp, XFS_GROWFS_SPACE_RES(mp),
 207                        XFS_GROWDATA_LOG_RES(mp), 0, 0, 0))) {
 208                xfs_trans_cancel(tp, 0);
 209                return error;
 210        }
 211
 212        /*
 213         * Write new AG headers to disk. Non-transactional, but written
 214         * synchronously so they are completed prior to the growfs transaction
 215         * being logged.
 216         */
 217        nfree = 0;
 218        for (agno = nagcount - 1; agno >= oagcount; agno--, new -= agsize) {
 219                /*
 220                 * AG freespace header block
 221                 */
 222                bp = xfs_growfs_get_hdr_buf(mp,
 223                                XFS_AG_DADDR(mp, agno, XFS_AGF_DADDR(mp)),
 224                                XFS_FSS_TO_BB(mp, 1), 0,
 225                                &xfs_agf_buf_ops);
 226                if (!bp) {
 227                        error = ENOMEM;
 228                        goto error0;
 229                }
 230
 231                agf = XFS_BUF_TO_AGF(bp);
 232                agf->agf_magicnum = cpu_to_be32(XFS_AGF_MAGIC);
 233                agf->agf_versionnum = cpu_to_be32(XFS_AGF_VERSION);
 234                agf->agf_seqno = cpu_to_be32(agno);
 235                if (agno == nagcount - 1)
 236                        agsize =
 237                                nb -
 238                                (agno * (xfs_rfsblock_t)mp->m_sb.sb_agblocks);
 239                else
 240                        agsize = mp->m_sb.sb_agblocks;
 241                agf->agf_length = cpu_to_be32(agsize);
 242                agf->agf_roots[XFS_BTNUM_BNOi] = cpu_to_be32(XFS_BNO_BLOCK(mp));
 243                agf->agf_roots[XFS_BTNUM_CNTi] = cpu_to_be32(XFS_CNT_BLOCK(mp));
 244                agf->agf_levels[XFS_BTNUM_BNOi] = cpu_to_be32(1);
 245                agf->agf_levels[XFS_BTNUM_CNTi] = cpu_to_be32(1);
 246                agf->agf_flfirst = 0;
 247                agf->agf_fllast = cpu_to_be32(XFS_AGFL_SIZE(mp) - 1);
 248                agf->agf_flcount = 0;
 249                tmpsize = agsize - XFS_PREALLOC_BLOCKS(mp);
 250                agf->agf_freeblks = cpu_to_be32(tmpsize);
 251                agf->agf_longest = cpu_to_be32(tmpsize);
 252                if (xfs_sb_version_hascrc(&mp->m_sb))
 253                        uuid_copy(&agf->agf_uuid, &mp->m_sb.sb_uuid);
 254
 255                error = xfs_bwrite(bp);
 256                xfs_buf_relse(bp);
 257                if (error)
 258                        goto error0;
 259
 260                /*
 261                 * AG freelist header block
 262                 */
 263                bp = xfs_growfs_get_hdr_buf(mp,
 264                                XFS_AG_DADDR(mp, agno, XFS_AGFL_DADDR(mp)),
 265                                XFS_FSS_TO_BB(mp, 1), 0,
 266                                &xfs_agfl_buf_ops);
 267                if (!bp) {
 268                        error = ENOMEM;
 269                        goto error0;
 270                }
 271
 272                agfl = XFS_BUF_TO_AGFL(bp);
 273                if (xfs_sb_version_hascrc(&mp->m_sb)) {
 274                        agfl->agfl_magicnum = cpu_to_be32(XFS_AGFL_MAGIC);
 275                        agfl->agfl_seqno = cpu_to_be32(agno);
 276                        uuid_copy(&agfl->agfl_uuid, &mp->m_sb.sb_uuid);
 277                }
 278                for (bucket = 0; bucket < XFS_AGFL_SIZE(mp); bucket++)
 279                        agfl->agfl_bno[bucket] = cpu_to_be32(NULLAGBLOCK);
 280
 281                error = xfs_bwrite(bp);
 282                xfs_buf_relse(bp);
 283                if (error)
 284                        goto error0;
 285
 286                /*
 287                 * AG inode header block
 288                 */
 289                bp = xfs_growfs_get_hdr_buf(mp,
 290                                XFS_AG_DADDR(mp, agno, XFS_AGI_DADDR(mp)),
 291                                XFS_FSS_TO_BB(mp, 1), 0,
 292                                &xfs_agi_buf_ops);
 293                if (!bp) {
 294                        error = ENOMEM;
 295                        goto error0;
 296                }
 297
 298                agi = XFS_BUF_TO_AGI(bp);
 299                agi->agi_magicnum = cpu_to_be32(XFS_AGI_MAGIC);
 300                agi->agi_versionnum = cpu_to_be32(XFS_AGI_VERSION);
 301                agi->agi_seqno = cpu_to_be32(agno);
 302                agi->agi_length = cpu_to_be32(agsize);
 303                agi->agi_count = 0;
 304                agi->agi_root = cpu_to_be32(XFS_IBT_BLOCK(mp));
 305                agi->agi_level = cpu_to_be32(1);
 306                agi->agi_freecount = 0;
 307                agi->agi_newino = cpu_to_be32(NULLAGINO);
 308                agi->agi_dirino = cpu_to_be32(NULLAGINO);
 309                if (xfs_sb_version_hascrc(&mp->m_sb))
 310                        uuid_copy(&agi->agi_uuid, &mp->m_sb.sb_uuid);
 311                for (bucket = 0; bucket < XFS_AGI_UNLINKED_BUCKETS; bucket++)
 312                        agi->agi_unlinked[bucket] = cpu_to_be32(NULLAGINO);
 313
 314                error = xfs_bwrite(bp);
 315                xfs_buf_relse(bp);
 316                if (error)
 317                        goto error0;
 318
 319                /*
 320                 * BNO btree root block
 321                 */
 322                bp = xfs_growfs_get_hdr_buf(mp,
 323                                XFS_AGB_TO_DADDR(mp, agno, XFS_BNO_BLOCK(mp)),
 324                                BTOBB(mp->m_sb.sb_blocksize), 0,
 325                                &xfs_allocbt_buf_ops);
 326
 327                if (!bp) {
 328                        error = ENOMEM;
 329                        goto error0;
 330                }
 331
 332                if (xfs_sb_version_hascrc(&mp->m_sb))
 333                        xfs_btree_init_block(mp, bp, XFS_ABTB_CRC_MAGIC, 0, 1,
 334                                                agno, XFS_BTREE_CRC_BLOCKS);
 335                else
 336                        xfs_btree_init_block(mp, bp, XFS_ABTB_MAGIC, 0, 1,
 337                                                agno, 0);
 338
 339                arec = XFS_ALLOC_REC_ADDR(mp, XFS_BUF_TO_BLOCK(bp), 1);
 340                arec->ar_startblock = cpu_to_be32(XFS_PREALLOC_BLOCKS(mp));
 341                arec->ar_blockcount = cpu_to_be32(
 342                        agsize - be32_to_cpu(arec->ar_startblock));
 343
 344                error = xfs_bwrite(bp);
 345                xfs_buf_relse(bp);
 346                if (error)
 347                        goto error0;
 348
 349                /*
 350                 * CNT btree root block
 351                 */
 352                bp = xfs_growfs_get_hdr_buf(mp,
 353                                XFS_AGB_TO_DADDR(mp, agno, XFS_CNT_BLOCK(mp)),
 354                                BTOBB(mp->m_sb.sb_blocksize), 0,
 355                                &xfs_allocbt_buf_ops);
 356                if (!bp) {
 357                        error = ENOMEM;
 358                        goto error0;
 359                }
 360
 361                if (xfs_sb_version_hascrc(&mp->m_sb))
 362                        xfs_btree_init_block(mp, bp, XFS_ABTC_CRC_MAGIC, 0, 1,
 363                                                agno, XFS_BTREE_CRC_BLOCKS);
 364                else
 365                        xfs_btree_init_block(mp, bp, XFS_ABTC_MAGIC, 0, 1,
 366                                                agno, 0);
 367
 368                arec = XFS_ALLOC_REC_ADDR(mp, XFS_BUF_TO_BLOCK(bp), 1);
 369                arec->ar_startblock = cpu_to_be32(XFS_PREALLOC_BLOCKS(mp));
 370                arec->ar_blockcount = cpu_to_be32(
 371                        agsize - be32_to_cpu(arec->ar_startblock));
 372                nfree += be32_to_cpu(arec->ar_blockcount);
 373
 374                error = xfs_bwrite(bp);
 375                xfs_buf_relse(bp);
 376                if (error)
 377                        goto error0;
 378
 379                /*
 380                 * INO btree root block
 381                 */
 382                bp = xfs_growfs_get_hdr_buf(mp,
 383                                XFS_AGB_TO_DADDR(mp, agno, XFS_IBT_BLOCK(mp)),
 384                                BTOBB(mp->m_sb.sb_blocksize), 0,
 385                                &xfs_inobt_buf_ops);
 386                if (!bp) {
 387                        error = ENOMEM;
 388                        goto error0;
 389                }
 390
 391                if (xfs_sb_version_hascrc(&mp->m_sb))
 392                        xfs_btree_init_block(mp, bp, XFS_IBT_CRC_MAGIC, 0, 0,
 393                                                agno, XFS_BTREE_CRC_BLOCKS);
 394                else
 395                        xfs_btree_init_block(mp, bp, XFS_IBT_MAGIC, 0, 0,
 396                                                agno, 0);
 397
 398                error = xfs_bwrite(bp);
 399                xfs_buf_relse(bp);
 400                if (error)
 401                        goto error0;
 402        }
 403        xfs_trans_agblocks_delta(tp, nfree);
 404        /*
 405         * There are new blocks in the old last a.g.
 406         */
 407        if (new) {
 408                /*
 409                 * Change the agi length.
 410                 */
 411                error = xfs_ialloc_read_agi(mp, tp, agno, &bp);
 412                if (error) {
 413                        goto error0;
 414                }
 415                ASSERT(bp);
 416                agi = XFS_BUF_TO_AGI(bp);
 417                be32_add_cpu(&agi->agi_length, new);
 418                ASSERT(nagcount == oagcount ||
 419                       be32_to_cpu(agi->agi_length) == mp->m_sb.sb_agblocks);
 420                xfs_ialloc_log_agi(tp, bp, XFS_AGI_LENGTH);
 421                /*
 422                 * Change agf length.
 423                 */
 424                error = xfs_alloc_read_agf(mp, tp, agno, 0, &bp);
 425                if (error) {
 426                        goto error0;
 427                }
 428                ASSERT(bp);
 429                agf = XFS_BUF_TO_AGF(bp);
 430                be32_add_cpu(&agf->agf_length, new);
 431                ASSERT(be32_to_cpu(agf->agf_length) ==
 432                       be32_to_cpu(agi->agi_length));
 433
 434                xfs_alloc_log_agf(tp, bp, XFS_AGF_LENGTH);
 435                /*
 436                 * Free the new space.
 437                 */
 438                error = xfs_free_extent(tp, XFS_AGB_TO_FSB(mp, agno,
 439                        be32_to_cpu(agf->agf_length) - new), new);
 440                if (error) {
 441                        goto error0;
 442                }
 443        }
 444
 445        /*
 446         * Update changed superblock fields transactionally. These are not
 447         * seen by the rest of the world until the transaction commit applies
 448         * them atomically to the superblock.
 449         */
 450        if (nagcount > oagcount)
 451                xfs_trans_mod_sb(tp, XFS_TRANS_SB_AGCOUNT, nagcount - oagcount);
 452        if (nb > mp->m_sb.sb_dblocks)
 453                xfs_trans_mod_sb(tp, XFS_TRANS_SB_DBLOCKS,
 454                                 nb - mp->m_sb.sb_dblocks);
 455        if (nfree)
 456                xfs_trans_mod_sb(tp, XFS_TRANS_SB_FDBLOCKS, nfree);
 457        if (dpct)
 458                xfs_trans_mod_sb(tp, XFS_TRANS_SB_IMAXPCT, dpct);
 459        error = xfs_trans_commit(tp, 0);
 460        if (error)
 461                return error;
 462
 463        /* New allocation groups fully initialized, so update mount struct */
 464        if (nagimax)
 465                mp->m_maxagi = nagimax;
 466        if (mp->m_sb.sb_imax_pct) {
 467                __uint64_t icount = mp->m_sb.sb_dblocks * mp->m_sb.sb_imax_pct;
 468                do_div(icount, 100);
 469                mp->m_maxicount = icount << mp->m_sb.sb_inopblog;
 470        } else
 471                mp->m_maxicount = 0;
 472        xfs_set_low_space_thresholds(mp);
 473
 474        /* update secondary superblocks. */
 475        for (agno = 1; agno < nagcount; agno++) {
 476                error = 0;
 477                /*
 478                 * new secondary superblocks need to be zeroed, not read from
 479                 * disk as the contents of the new area we are growing into is
 480                 * completely unknown.
 481                 */
 482                if (agno < oagcount) {
 483                        error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp,
 484                                  XFS_AGB_TO_DADDR(mp, agno, XFS_SB_BLOCK(mp)),
 485                                  XFS_FSS_TO_BB(mp, 1), 0, &bp,
 486                                  &xfs_sb_buf_ops);
 487                } else {
 488                        bp = xfs_trans_get_buf(NULL, mp->m_ddev_targp,
 489                                  XFS_AGB_TO_DADDR(mp, agno, XFS_SB_BLOCK(mp)),
 490                                  XFS_FSS_TO_BB(mp, 1), 0);
 491                        if (bp) {
 492                                bp->b_ops = &xfs_sb_buf_ops;
 493                                xfs_buf_zero(bp, 0, BBTOB(bp->b_length));
 494                        } else
 495                                error = ENOMEM;
 496                }
 497
 498                if (error) {
 499                        xfs_warn(mp,
 500                "error %d reading secondary superblock for ag %d",
 501                                error, agno);
 502                        break;
 503                }
 504                xfs_sb_to_disk(XFS_BUF_TO_SBP(bp), &mp->m_sb, XFS_SB_ALL_BITS);
 505
 506                /*
 507                 * If we get an error writing out the alternate superblocks,
 508                 * just issue a warning and continue.  The real work is
 509                 * already done and committed.
 510                 */
 511                error = xfs_bwrite(bp);
 512                xfs_buf_relse(bp);
 513                if (error) {
 514                        xfs_warn(mp,
 515                "write error %d updating secondary superblock for ag %d",
 516                                error, agno);
 517                        break; /* no point in continuing */
 518                }
 519        }
 520        return error;
 521
 522 error0:
 523        xfs_trans_cancel(tp, XFS_TRANS_ABORT);
 524        return error;
 525}
 526
 527static int
 528xfs_growfs_log_private(
 529        xfs_mount_t             *mp,    /* mount point for filesystem */
 530        xfs_growfs_log_t        *in)    /* growfs log input struct */
 531{
 532        xfs_extlen_t            nb;
 533
 534        nb = in->newblocks;
 535        if (nb < XFS_MIN_LOG_BLOCKS || nb < XFS_B_TO_FSB(mp, XFS_MIN_LOG_BYTES))
 536                return XFS_ERROR(EINVAL);
 537        if (nb == mp->m_sb.sb_logblocks &&
 538            in->isint == (mp->m_sb.sb_logstart != 0))
 539                return XFS_ERROR(EINVAL);
 540        /*
 541         * Moving the log is hard, need new interfaces to sync
 542         * the log first, hold off all activity while moving it.
 543         * Can have shorter or longer log in the same space,
 544         * or transform internal to external log or vice versa.
 545         */
 546        return XFS_ERROR(ENOSYS);
 547}
 548
 549/*
 550 * protected versions of growfs function acquire and release locks on the mount
 551 * point - exported through ioctls: XFS_IOC_FSGROWFSDATA, XFS_IOC_FSGROWFSLOG,
 552 * XFS_IOC_FSGROWFSRT
 553 */
 554
 555
 556int
 557xfs_growfs_data(
 558        xfs_mount_t             *mp,
 559        xfs_growfs_data_t       *in)
 560{
 561        int error;
 562
 563        if (!capable(CAP_SYS_ADMIN))
 564                return XFS_ERROR(EPERM);
 565        if (!mutex_trylock(&mp->m_growlock))
 566                return XFS_ERROR(EWOULDBLOCK);
 567        error = xfs_growfs_data_private(mp, in);
 568        mutex_unlock(&mp->m_growlock);
 569        return error;
 570}
 571
 572int
 573xfs_growfs_log(
 574        xfs_mount_t             *mp,
 575        xfs_growfs_log_t        *in)
 576{
 577        int error;
 578
 579        if (!capable(CAP_SYS_ADMIN))
 580                return XFS_ERROR(EPERM);
 581        if (!mutex_trylock(&mp->m_growlock))
 582                return XFS_ERROR(EWOULDBLOCK);
 583        error = xfs_growfs_log_private(mp, in);
 584        mutex_unlock(&mp->m_growlock);
 585        return error;
 586}
 587
 588/*
 589 * exported through ioctl XFS_IOC_FSCOUNTS
 590 */
 591
 592int
 593xfs_fs_counts(
 594        xfs_mount_t             *mp,
 595        xfs_fsop_counts_t       *cnt)
 596{
 597        xfs_icsb_sync_counters(mp, XFS_ICSB_LAZY_COUNT);
 598        spin_lock(&mp->m_sb_lock);
 599        cnt->freedata = mp->m_sb.sb_fdblocks - XFS_ALLOC_SET_ASIDE(mp);
 600        cnt->freertx = mp->m_sb.sb_frextents;
 601        cnt->freeino = mp->m_sb.sb_ifree;
 602        cnt->allocino = mp->m_sb.sb_icount;
 603        spin_unlock(&mp->m_sb_lock);
 604        return 0;
 605}
 606
 607/*
 608 * exported through ioctl XFS_IOC_SET_RESBLKS & XFS_IOC_GET_RESBLKS
 609 *
 610 * xfs_reserve_blocks is called to set m_resblks
 611 * in the in-core mount table. The number of unused reserved blocks
 612 * is kept in m_resblks_avail.
 613 *
 614 * Reserve the requested number of blocks if available. Otherwise return
 615 * as many as possible to satisfy the request. The actual number
 616 * reserved are returned in outval
 617 *
 618 * A null inval pointer indicates that only the current reserved blocks
 619 * available  should  be returned no settings are changed.
 620 */
 621
 622int
 623xfs_reserve_blocks(
 624        xfs_mount_t             *mp,
 625        __uint64_t              *inval,
 626        xfs_fsop_resblks_t      *outval)
 627{
 628        __int64_t               lcounter, delta, fdblks_delta;
 629        __uint64_t              request;
 630
 631        /* If inval is null, report current values and return */
 632        if (inval == (__uint64_t *)NULL) {
 633                if (!outval)
 634                        return EINVAL;
 635                outval->resblks = mp->m_resblks;
 636                outval->resblks_avail = mp->m_resblks_avail;
 637                return 0;
 638        }
 639
 640        request = *inval;
 641
 642        /*
 643         * With per-cpu counters, this becomes an interesting
 644         * problem. we needto work out if we are freeing or allocation
 645         * blocks first, then we can do the modification as necessary.
 646         *
 647         * We do this under the m_sb_lock so that if we are near
 648         * ENOSPC, we will hold out any changes while we work out
 649         * what to do. This means that the amount of free space can
 650         * change while we do this, so we need to retry if we end up
 651         * trying to reserve more space than is available.
 652         *
 653         * We also use the xfs_mod_incore_sb() interface so that we
 654         * don't have to care about whether per cpu counter are
 655         * enabled, disabled or even compiled in....
 656         */
 657retry:
 658        spin_lock(&mp->m_sb_lock);
 659        xfs_icsb_sync_counters_locked(mp, 0);
 660
 661        /*
 662         * If our previous reservation was larger than the current value,
 663         * then move any unused blocks back to the free pool.
 664         */
 665        fdblks_delta = 0;
 666        if (mp->m_resblks > request) {
 667                lcounter = mp->m_resblks_avail - request;
 668                if (lcounter  > 0) {            /* release unused blocks */
 669                        fdblks_delta = lcounter;
 670                        mp->m_resblks_avail -= lcounter;
 671                }
 672                mp->m_resblks = request;
 673        } else {
 674                __int64_t       free;
 675
 676                free =  mp->m_sb.sb_fdblocks - XFS_ALLOC_SET_ASIDE(mp);
 677                if (!free)
 678                        goto out; /* ENOSPC and fdblks_delta = 0 */
 679
 680                delta = request - mp->m_resblks;
 681                lcounter = free - delta;
 682                if (lcounter < 0) {
 683                        /* We can't satisfy the request, just get what we can */
 684                        mp->m_resblks += free;
 685                        mp->m_resblks_avail += free;
 686                        fdblks_delta = -free;
 687                } else {
 688                        fdblks_delta = -delta;
 689                        mp->m_resblks = request;
 690                        mp->m_resblks_avail += delta;
 691                }
 692        }
 693out:
 694        if (outval) {
 695                outval->resblks = mp->m_resblks;
 696                outval->resblks_avail = mp->m_resblks_avail;
 697        }
 698        spin_unlock(&mp->m_sb_lock);
 699
 700        if (fdblks_delta) {
 701                /*
 702                 * If we are putting blocks back here, m_resblks_avail is
 703                 * already at its max so this will put it in the free pool.
 704                 *
 705                 * If we need space, we'll either succeed in getting it
 706                 * from the free block count or we'll get an enospc. If
 707                 * we get a ENOSPC, it means things changed while we were
 708                 * calculating fdblks_delta and so we should try again to
 709                 * see if there is anything left to reserve.
 710                 *
 711                 * Don't set the reserved flag here - we don't want to reserve
 712                 * the extra reserve blocks from the reserve.....
 713                 */
 714                int error;
 715                error = xfs_icsb_modify_counters(mp, XFS_SBS_FDBLOCKS,
 716                                                 fdblks_delta, 0);
 717                if (error == ENOSPC)
 718                        goto retry;
 719        }
 720        return 0;
 721}
 722
 723/*
 724 * Dump a transaction into the log that contains no real change. This is needed
 725 * to be able to make the log dirty or stamp the current tail LSN into the log
 726 * during the covering operation.
 727 *
 728 * We cannot use an inode here for this - that will push dirty state back up
 729 * into the VFS and then periodic inode flushing will prevent log covering from
 730 * making progress. Hence we log a field in the superblock instead and use a
 731 * synchronous transaction to ensure the superblock is immediately unpinned
 732 * and can be written back.
 733 */
 734int
 735xfs_fs_log_dummy(
 736        xfs_mount_t     *mp)
 737{
 738        xfs_trans_t     *tp;
 739        int             error;
 740
 741        tp = _xfs_trans_alloc(mp, XFS_TRANS_DUMMY1, KM_SLEEP);
 742        error = xfs_trans_reserve(tp, 0, XFS_SB_LOG_RES(mp), 0, 0,
 743                                  XFS_DEFAULT_LOG_COUNT);
 744        if (error) {
 745                xfs_trans_cancel(tp, 0);
 746                return error;
 747        }
 748
 749        /* log the UUID because it is an unchanging field */
 750        xfs_mod_sb(tp, XFS_SB_UUID);
 751        xfs_trans_set_sync(tp);
 752        return xfs_trans_commit(tp, 0);
 753}
 754
 755int
 756xfs_fs_goingdown(
 757        xfs_mount_t     *mp,
 758        __uint32_t      inflags)
 759{
 760        switch (inflags) {
 761        case XFS_FSOP_GOING_FLAGS_DEFAULT: {
 762                struct super_block *sb = freeze_bdev(mp->m_super->s_bdev);
 763
 764                if (sb && !IS_ERR(sb)) {
 765                        xfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT);
 766                        thaw_bdev(sb->s_bdev, sb);
 767                }
 768
 769                break;
 770        }
 771        case XFS_FSOP_GOING_FLAGS_LOGFLUSH:
 772                xfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT);
 773                break;
 774        case XFS_FSOP_GOING_FLAGS_NOLOGFLUSH:
 775                xfs_force_shutdown(mp,
 776                                SHUTDOWN_FORCE_UMOUNT | SHUTDOWN_LOG_IO_ERROR);
 777                break;
 778        default:
 779                return XFS_ERROR(EINVAL);
 780        }
 781
 782        return 0;
 783}
 784
 785/*
 786 * Force a shutdown of the filesystem instantly while keeping the filesystem
 787 * consistent. We don't do an unmount here; just shutdown the shop, make sure
 788 * that absolutely nothing persistent happens to this filesystem after this
 789 * point.
 790 */
 791void
 792xfs_do_force_shutdown(
 793        xfs_mount_t     *mp,
 794        int             flags,
 795        char            *fname,
 796        int             lnnum)
 797{
 798        int             logerror;
 799
 800        logerror = flags & SHUTDOWN_LOG_IO_ERROR;
 801
 802        if (!(flags & SHUTDOWN_FORCE_UMOUNT)) {
 803                xfs_notice(mp,
 804        "%s(0x%x) called from line %d of file %s.  Return address = 0x%p",
 805                        __func__, flags, lnnum, fname, __return_address);
 806        }
 807        /*
 808         * No need to duplicate efforts.
 809         */
 810        if (XFS_FORCED_SHUTDOWN(mp) && !logerror)
 811                return;
 812
 813        /*
 814         * This flags XFS_MOUNT_FS_SHUTDOWN, makes sure that we don't
 815         * queue up anybody new on the log reservations, and wakes up
 816         * everybody who's sleeping on log reservations to tell them
 817         * the bad news.
 818         */
 819        if (xfs_log_force_umount(mp, logerror))
 820                return;
 821
 822        if (flags & SHUTDOWN_CORRUPT_INCORE) {
 823                xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_CORRUPT,
 824    "Corruption of in-memory data detected.  Shutting down filesystem");
 825                if (XFS_ERRLEVEL_HIGH <= xfs_error_level)
 826                        xfs_stack_trace();
 827        } else if (!(flags & SHUTDOWN_FORCE_UMOUNT)) {
 828                if (logerror) {
 829                        xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_LOGERROR,
 830                "Log I/O Error Detected.  Shutting down filesystem");
 831                } else if (flags & SHUTDOWN_DEVICE_REQ) {
 832                        xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_IOERROR,
 833                "All device paths lost.  Shutting down filesystem");
 834                } else if (!(flags & SHUTDOWN_REMOTE_REQ)) {
 835                        xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_IOERROR,
 836                "I/O Error Detected. Shutting down filesystem");
 837                }
 838        }
 839        if (!(flags & SHUTDOWN_FORCE_UMOUNT)) {
 840                xfs_alert(mp,
 841        "Please umount the filesystem and rectify the problem(s)");
 842        }
 843}
 844
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