Pileus Git - ~andy/linux/blob - fs/gfs2/super.c

   1 /*
   2  * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
   3  * Copyright (C) 2004-2007 Red Hat, Inc.  All rights reserved.
   4  *
   5  * This copyrighted material is made available to anyone wishing to use,
   6  * modify, copy, or redistribute it subject to the terms and conditions
   7  * of the GNU General Public License version 2.
   8  */
   9
  10 #include <linux/bio.h>
  11 #include <linux/sched.h>
  12 #include <linux/slab.h>
  13 #include <linux/spinlock.h>
  14 #include <linux/completion.h>
  15 #include <linux/buffer_head.h>
  16 #include <linux/statfs.h>
  17 #include <linux/seq_file.h>
  18 #include <linux/mount.h>
  19 #include <linux/kthread.h>
  20 #include <linux/delay.h>
  21 #include <linux/gfs2_ondisk.h>
  22 #include <linux/crc32.h>
  23 #include <linux/time.h>
  24
  25 #include "gfs2.h"
  26 #include "incore.h"
  27 #include "bmap.h"
  28 #include "dir.h"
  29 #include "glock.h"
  30 #include "glops.h"
  31 #include "inode.h"
  32 #include "log.h"
  33 #include "meta_io.h"
  34 #include "quota.h"
  35 #include "recovery.h"
  36 #include "rgrp.h"
  37 #include "super.h"
  38 #include "trans.h"
  39 #include "util.h"
  40 #include "sys.h"
  41 #include "xattr.h"
  42
  43 #define args_neq(a1, a2, x) ((a1)->ar_##x != (a2)->ar_##x)
  44
  45 enum {
  46         Opt_lockproto,
  47         Opt_locktable,
  48         Opt_hostdata,
  49         Opt_spectator,
  50         Opt_ignore_local_fs,
  51         Opt_localflocks,
  52         Opt_localcaching,
  53         Opt_debug,
  54         Opt_nodebug,
  55         Opt_upgrade,
  56         Opt_acl,
  57         Opt_noacl,
  58         Opt_quota_off,
  59         Opt_quota_account,
  60         Opt_quota_on,
  61         Opt_quota,
  62         Opt_noquota,
  63         Opt_suiddir,
  64         Opt_nosuiddir,
  65         Opt_data_writeback,
  66         Opt_data_ordered,
  67         Opt_meta,
  68         Opt_discard,
  69         Opt_nodiscard,
  70         Opt_commit,
  71         Opt_err_withdraw,
  72         Opt_err_panic,
  73         Opt_error,
  74 };
  75
  76 static const match_table_t tokens = {
  77         {Opt_lockproto, "lockproto=%s"},
  78         {Opt_locktable, "locktable=%s"},
  79         {Opt_hostdata, "hostdata=%s"},
  80         {Opt_spectator, "spectator"},
  81         {Opt_ignore_local_fs, "ignore_local_fs"},
  82         {Opt_localflocks, "localflocks"},
  83         {Opt_localcaching, "localcaching"},
  84         {Opt_debug, "debug"},
  85         {Opt_nodebug, "nodebug"},
  86         {Opt_upgrade, "upgrade"},
  87         {Opt_acl, "acl"},
  88         {Opt_noacl, "noacl"},
  89         {Opt_quota_off, "quota=off"},
  90         {Opt_quota_account, "quota=account"},
  91         {Opt_quota_on, "quota=on"},
  92         {Opt_quota, "quota"},
  93         {Opt_noquota, "noquota"},
  94         {Opt_suiddir, "suiddir"},
  95         {Opt_nosuiddir, "nosuiddir"},
  96         {Opt_data_writeback, "data=writeback"},
  97         {Opt_data_ordered, "data=ordered"},
  98         {Opt_meta, "meta"},
  99         {Opt_discard, "discard"},
 100         {Opt_nodiscard, "nodiscard"},
 101         {Opt_commit, "commit=%d"},
 102         {Opt_err_withdraw, "errors=withdraw"},
 103         {Opt_err_panic, "errors=panic"},
 104         {Opt_error, NULL}
 105 };
 106
 107 /**
 108  * gfs2_mount_args - Parse mount options
 109  * @sdp:
 110  * @data:
 111  *
 112  * Return: errno
 113  */
 114
 115 int gfs2_mount_args(struct gfs2_sbd *sdp, struct gfs2_args *args, char *options)
 116 {
 117         char *o;
 118         int token;
 119         substring_t tmp[MAX_OPT_ARGS];
 120         int rv;
 121
 122         /* Split the options into tokens with the "," character and
 123            process them */
 124
 125         while (1) {
 126                 o = strsep(&options, ",");
 127                 if (o == NULL)
 128                         break;
 129                 if (*o == '\0')
 130                         continue;
 131
 132                 token = match_token(o, tokens, tmp);
 133                 switch (token) {
 134                 case Opt_lockproto:
 135                         match_strlcpy(args->ar_lockproto, &tmp[0],
 136                                       GFS2_LOCKNAME_LEN);
 137                         break;
 138                 case Opt_locktable:
 139                         match_strlcpy(args->ar_locktable, &tmp[0],
 140                                       GFS2_LOCKNAME_LEN);
 141                         break;
 142                 case Opt_hostdata:
 143                         match_strlcpy(args->ar_hostdata, &tmp[0],
 144                                       GFS2_LOCKNAME_LEN);
 145                         break;
 146                 case Opt_spectator:
 147                         args->ar_spectator = 1;
 148                         break;
 149                 case Opt_ignore_local_fs:
 150                         args->ar_ignore_local_fs = 1;
 151                         break;
 152                 case Opt_localflocks:
 153                         args->ar_localflocks = 1;
 154                         break;
 155                 case Opt_localcaching:
 156                         args->ar_localcaching = 1;
 157                         break;
 158                 case Opt_debug:
 159                         if (args->ar_errors == GFS2_ERRORS_PANIC) {
 160                                 fs_info(sdp, "-o debug and -o errors=panic "
 161                                        "are mutually exclusive.\n");
 162                                 return -EINVAL;
 163                         }
 164                         args->ar_debug = 1;
 165                         break;
 166                 case Opt_nodebug:
 167                         args->ar_debug = 0;
 168                         break;
 169                 case Opt_upgrade:
 170                         args->ar_upgrade = 1;
 171                         break;
 172                 case Opt_acl:
 173                         args->ar_posix_acl = 1;
 174                         break;
 175                 case Opt_noacl:
 176                         args->ar_posix_acl = 0;
 177                         break;
 178                 case Opt_quota_off:
 179                 case Opt_noquota:
 180                         args->ar_quota = GFS2_QUOTA_OFF;
 181                         break;
 182                 case Opt_quota_account:
 183                         args->ar_quota = GFS2_QUOTA_ACCOUNT;
 184                         break;
 185                 case Opt_quota_on:
 186                 case Opt_quota:
 187                         args->ar_quota = GFS2_QUOTA_ON;
 188                         break;
 189                 case Opt_suiddir:
 190                         args->ar_suiddir = 1;
 191                         break;
 192                 case Opt_nosuiddir:
 193                         args->ar_suiddir = 0;
 194                         break;
 195                 case Opt_data_writeback:
 196                         args->ar_data = GFS2_DATA_WRITEBACK;
 197                         break;
 198                 case Opt_data_ordered:
 199                         args->ar_data = GFS2_DATA_ORDERED;
 200                         break;
 201                 case Opt_meta:
 202                         args->ar_meta = 1;
 203                         break;
 204                 case Opt_discard:
 205                         args->ar_discard = 1;
 206                         break;
 207                 case Opt_nodiscard:
 208                         args->ar_discard = 0;
 209                         break;
 210                 case Opt_commit:
 211                         rv = match_int(&tmp[0], &args->ar_commit);
 212                         if (rv || args->ar_commit <= 0) {
 213                                 fs_info(sdp, "commit mount option requires a positive numeric argument\n");
 214                                 return rv ? rv : -EINVAL;
 215                         }
 216                         break;
 217                 case Opt_err_withdraw:
 218                         args->ar_errors = GFS2_ERRORS_WITHDRAW;
 219                         break;
 220                 case Opt_err_panic:
 221                         if (args->ar_debug) {
 222                                 fs_info(sdp, "-o debug and -o errors=panic "
 223                                         "are mutually exclusive.\n");
 224                                 return -EINVAL;
 225                         }
 226                         args->ar_errors = GFS2_ERRORS_PANIC;
 227                         break;
 228                 case Opt_error:
 229                 default:
 230                         fs_info(sdp, "invalid mount option: %s\n", o);
 231                         return -EINVAL;
 232                 }
 233         }
 234
 235         return 0;
 236 }
 237
 238 /**
 239  * gfs2_jindex_free - Clear all the journal index information
 240  * @sdp: The GFS2 superblock
 241  *
 242  */
 243
 244 void gfs2_jindex_free(struct gfs2_sbd *sdp)
 245 {
 246         struct list_head list, *head;
 247         struct gfs2_jdesc *jd;
 248         struct gfs2_journal_extent *jext;
 249
 250         spin_lock(&sdp->sd_jindex_spin);
 251         list_add(&list, &sdp->sd_jindex_list);
 252         list_del_init(&sdp->sd_jindex_list);
 253         sdp->sd_journals = 0;
 254         spin_unlock(&sdp->sd_jindex_spin);
 255
 256         while (!list_empty(&list)) {
 257                 jd = list_entry(list.next, struct gfs2_jdesc, jd_list);
 258                 head = &jd->extent_list;
 259                 while (!list_empty(head)) {
 260                         jext = list_entry(head->next,
 261                                           struct gfs2_journal_extent,
 262                                           extent_list);
 263                         list_del(&jext->extent_list);
 264                         kfree(jext);
 265                 }
 266                 list_del(&jd->jd_list);
 267                 iput(jd->jd_inode);
 268                 kfree(jd);
 269         }
 270 }
 271
 272 static struct gfs2_jdesc *jdesc_find_i(struct list_head *head, unsigned int jid)
 273 {
 274         struct gfs2_jdesc *jd;
 275         int found = 0;
 276
 277         list_for_each_entry(jd, head, jd_list) {
 278                 if (jd->jd_jid == jid) {
 279                         found = 1;
 280                         break;
 281                 }
 282         }
 283
 284         if (!found)
 285                 jd = NULL;
 286
 287         return jd;
 288 }
 289
 290 struct gfs2_jdesc *gfs2_jdesc_find(struct gfs2_sbd *sdp, unsigned int jid)
 291 {
 292         struct gfs2_jdesc *jd;
 293
 294         spin_lock(&sdp->sd_jindex_spin);
 295         jd = jdesc_find_i(&sdp->sd_jindex_list, jid);
 296         spin_unlock(&sdp->sd_jindex_spin);
 297
 298         return jd;
 299 }
 300
 301 int gfs2_jdesc_check(struct gfs2_jdesc *jd)
 302 {
 303         struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
 304         struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
 305         int ar;
 306         int error;
 307
 308         if (ip->i_disksize < (8 << 20) || ip->i_disksize > (1 << 30) ||
 309             (ip->i_disksize & (sdp->sd_sb.sb_bsize - 1))) {
 310                 gfs2_consist_inode(ip);
 311                 return -EIO;
 312         }
 313         jd->jd_blocks = ip->i_disksize >> sdp->sd_sb.sb_bsize_shift;
 314
 315         error = gfs2_write_alloc_required(ip, 0, ip->i_disksize, &ar);
 316         if (!error && ar) {
 317                 gfs2_consist_inode(ip);
 318                 error = -EIO;
 319         }
 320
 321         return error;
 322 }
 323
 324 /**
 325  * gfs2_make_fs_rw - Turn a Read-Only FS into a Read-Write one
 326  * @sdp: the filesystem
 327  *
 328  * Returns: errno
 329  */
 330
 331 int gfs2_make_fs_rw(struct gfs2_sbd *sdp)
 332 {
 333         struct gfs2_inode *ip = GFS2_I(sdp->sd_jdesc->jd_inode);
 334         struct gfs2_glock *j_gl = ip->i_gl;
 335         struct gfs2_holder t_gh;
 336         struct gfs2_log_header_host head;
 337         int error;
 338
 339         error = gfs2_glock_nq_init(sdp->sd_trans_gl, LM_ST_SHARED, 0, &t_gh);
 340         if (error)
 341                 return error;
 342
 343         j_gl->gl_ops->go_inval(j_gl, DIO_METADATA);
 344
 345         error = gfs2_find_jhead(sdp->sd_jdesc, &head);
 346         if (error)
 347                 goto fail;
 348
 349         if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) {
 350                 gfs2_consist(sdp);
 351                 error = -EIO;
 352                 goto fail;
 353         }
 354
 355         /*  Initialize some head of the log stuff  */
 356         sdp->sd_log_sequence = head.lh_sequence + 1;
 357         gfs2_log_pointers_init(sdp, head.lh_blkno);
 358
 359         error = gfs2_quota_init(sdp);
 360         if (error)
 361                 goto fail;
 362
 363         set_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags);
 364
 365         gfs2_glock_dq_uninit(&t_gh);
 366
 367         return 0;
 368
 369 fail:
 370         t_gh.gh_flags |= GL_NOCACHE;
 371         gfs2_glock_dq_uninit(&t_gh);
 372
 373         return error;
 374 }
 375
 376 void gfs2_statfs_change_in(struct gfs2_statfs_change_host *sc, const void *buf)
 377 {
 378         const struct gfs2_statfs_change *str = buf;
 379
 380         sc->sc_total = be64_to_cpu(str->sc_total);
 381         sc->sc_free = be64_to_cpu(str->sc_free);
 382         sc->sc_dinodes = be64_to_cpu(str->sc_dinodes);
 383 }
 384
 385 static void gfs2_statfs_change_out(const struct gfs2_statfs_change_host *sc, void *buf)
 386 {
 387         struct gfs2_statfs_change *str = buf;
 388
 389         str->sc_total = cpu_to_be64(sc->sc_total);
 390         str->sc_free = cpu_to_be64(sc->sc_free);
 391         str->sc_dinodes = cpu_to_be64(sc->sc_dinodes);
 392 }
 393
 394 int gfs2_statfs_init(struct gfs2_sbd *sdp)
 395 {
 396         struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
 397         struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
 398         struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
 399         struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
 400         struct buffer_head *m_bh, *l_bh;
 401         struct gfs2_holder gh;
 402         int error;
 403
 404         error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE,
 405                                    &gh);
 406         if (error)
 407                 return error;
 408
 409         error = gfs2_meta_inode_buffer(m_ip, &m_bh);
 410         if (error)
 411                 goto out;
 412
 413         if (sdp->sd_args.ar_spectator) {
 414                 spin_lock(&sdp->sd_statfs_spin);
 415                 gfs2_statfs_change_in(m_sc, m_bh->b_data +
 416                                       sizeof(struct gfs2_dinode));
 417                 spin_unlock(&sdp->sd_statfs_spin);
 418         } else {
 419                 error = gfs2_meta_inode_buffer(l_ip, &l_bh);
 420                 if (error)
 421                         goto out_m_bh;
 422
 423                 spin_lock(&sdp->sd_statfs_spin);
 424                 gfs2_statfs_change_in(m_sc, m_bh->b_data +
 425                                       sizeof(struct gfs2_dinode));
 426                 gfs2_statfs_change_in(l_sc, l_bh->b_data +
 427                                       sizeof(struct gfs2_dinode));
 428                 spin_unlock(&sdp->sd_statfs_spin);
 429
 430                 brelse(l_bh);
 431         }
 432
 433 out_m_bh:
 434         brelse(m_bh);
 435 out:
 436         gfs2_glock_dq_uninit(&gh);
 437         return 0;
 438 }
 439
 440 void gfs2_statfs_change(struct gfs2_sbd *sdp, s64 total, s64 free,
 441                         s64 dinodes)
 442 {
 443         struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
 444         struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
 445         struct buffer_head *l_bh;
 446         int error;
 447
 448         error = gfs2_meta_inode_buffer(l_ip, &l_bh);
 449         if (error)
 450                 return;
 451
 452         gfs2_trans_add_bh(l_ip->i_gl, l_bh, 1);
 453
 454         spin_lock(&sdp->sd_statfs_spin);
 455         l_sc->sc_total += total;
 456         l_sc->sc_free += free;
 457         l_sc->sc_dinodes += dinodes;
 458         gfs2_statfs_change_out(l_sc, l_bh->b_data + sizeof(struct gfs2_dinode));
 459         spin_unlock(&sdp->sd_statfs_spin);
 460
 461         brelse(l_bh);
 462 }
 463
 464 void update_statfs(struct gfs2_sbd *sdp, struct buffer_head *m_bh,
 465                    struct buffer_head *l_bh)
 466 {
 467         struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
 468         struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
 469         struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
 470         struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
 471
 472         gfs2_trans_add_bh(l_ip->i_gl, l_bh, 1);
 473
 474         spin_lock(&sdp->sd_statfs_spin);
 475         m_sc->sc_total += l_sc->sc_total;
 476         m_sc->sc_free += l_sc->sc_free;
 477         m_sc->sc_dinodes += l_sc->sc_dinodes;
 478         memset(l_sc, 0, sizeof(struct gfs2_statfs_change));
 479         memset(l_bh->b_data + sizeof(struct gfs2_dinode),
 480                0, sizeof(struct gfs2_statfs_change));
 481         spin_unlock(&sdp->sd_statfs_spin);
 482
 483         gfs2_trans_add_bh(m_ip->i_gl, m_bh, 1);
 484         gfs2_statfs_change_out(m_sc, m_bh->b_data + sizeof(struct gfs2_dinode));
 485 }
 486
 487 int gfs2_statfs_sync(struct gfs2_sbd *sdp)
 488 {
 489         struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
 490         struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
 491         struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
 492         struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
 493         struct gfs2_holder gh;
 494         struct buffer_head *m_bh, *l_bh;
 495         int error;
 496
 497         error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE,
 498                                    &gh);
 499         if (error)
 500                 return error;
 501
 502         error = gfs2_meta_inode_buffer(m_ip, &m_bh);
 503         if (error)
 504                 goto out;
 505
 506         spin_lock(&sdp->sd_statfs_spin);
 507         gfs2_statfs_change_in(m_sc, m_bh->b_data +
 508                               sizeof(struct gfs2_dinode));
 509         if (!l_sc->sc_total && !l_sc->sc_free && !l_sc->sc_dinodes) {
 510                 spin_unlock(&sdp->sd_statfs_spin);
 511                 goto out_bh;
 512         }
 513         spin_unlock(&sdp->sd_statfs_spin);
 514
 515         error = gfs2_meta_inode_buffer(l_ip, &l_bh);
 516         if (error)
 517                 goto out_bh;
 518
 519         error = gfs2_trans_begin(sdp, 2 * RES_DINODE, 0);
 520         if (error)
 521                 goto out_bh2;
 522
 523         update_statfs(sdp, m_bh, l_bh);
 524
 525         gfs2_trans_end(sdp);
 526
 527 out_bh2:
 528         brelse(l_bh);
 529 out_bh:
 530         brelse(m_bh);
 531 out:
 532         gfs2_glock_dq_uninit(&gh);
 533         return error;
 534 }
 535
 536 struct lfcc {
 537         struct list_head list;
 538         struct gfs2_holder gh;
 539 };
 540
 541 /**
 542  * gfs2_lock_fs_check_clean - Stop all writes to the FS and check that all
 543  *                            journals are clean
 544  * @sdp: the file system
 545  * @state: the state to put the transaction lock into
 546  * @t_gh: the hold on the transaction lock
 547  *
 548  * Returns: errno
 549  */
 550
 551 static int gfs2_lock_fs_check_clean(struct gfs2_sbd *sdp,
 552                                     struct gfs2_holder *t_gh)
 553 {
 554         struct gfs2_inode *ip;
 555         struct gfs2_jdesc *jd;
 556         struct lfcc *lfcc;
 557         LIST_HEAD(list);
 558         struct gfs2_log_header_host lh;
 559         int error;
 560
 561         list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
 562                 lfcc = kmalloc(sizeof(struct lfcc), GFP_KERNEL);
 563                 if (!lfcc) {
 564                         error = -ENOMEM;
 565                         goto out;
 566                 }
 567                 ip = GFS2_I(jd->jd_inode);
 568                 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &lfcc->gh);
 569                 if (error) {
 570                         kfree(lfcc);
 571                         goto out;
 572                 }
 573                 list_add(&lfcc->list, &list);
 574         }
 575
 576         error = gfs2_glock_nq_init(sdp->sd_trans_gl, LM_ST_DEFERRED,
 577                                    GL_NOCACHE, t_gh);
 578
 579         list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
 580                 error = gfs2_jdesc_check(jd);
 581                 if (error)
 582                         break;
 583                 error = gfs2_find_jhead(jd, &lh);
 584                 if (error)
 585                         break;
 586                 if (!(lh.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) {
 587                         error = -EBUSY;
 588                         break;
 589                 }
 590         }
 591
 592         if (error)
 593                 gfs2_glock_dq_uninit(t_gh);
 594
 595 out:
 596         while (!list_empty(&list)) {
 597                 lfcc = list_entry(list.next, struct lfcc, list);
 598                 list_del(&lfcc->list);
 599                 gfs2_glock_dq_uninit(&lfcc->gh);
 600                 kfree(lfcc);
 601         }
 602         return error;
 603 }
 604
 605 /**
 606  * gfs2_freeze_fs - freezes the file system
 607  * @sdp: the file system
 608  *
 609  * This function flushes data and meta data for all machines by
 610  * aquiring the transaction log exclusively.  All journals are
 611  * ensured to be in a clean state as well.
 612  *
 613  * Returns: errno
 614  */
 615
 616 int gfs2_freeze_fs(struct gfs2_sbd *sdp)
 617 {
 618         int error = 0;
 619
 620         mutex_lock(&sdp->sd_freeze_lock);
 621
 622         if (!sdp->sd_freeze_count++) {
 623                 error = gfs2_lock_fs_check_clean(sdp, &sdp->sd_freeze_gh);
 624                 if (error)
 625                         sdp->sd_freeze_count--;
 626         }
 627
 628         mutex_unlock(&sdp->sd_freeze_lock);
 629
 630         return error;
 631 }
 632
 633 /**
 634  * gfs2_unfreeze_fs - unfreezes the file system
 635  * @sdp: the file system
 636  *
 637  * This function allows the file system to proceed by unlocking
 638  * the exclusively held transaction lock.  Other GFS2 nodes are
 639  * now free to acquire the lock shared and go on with their lives.
 640  *
 641  */
 642
 643 void gfs2_unfreeze_fs(struct gfs2_sbd *sdp)
 644 {
 645         mutex_lock(&sdp->sd_freeze_lock);
 646
 647         if (sdp->sd_freeze_count && !--sdp->sd_freeze_count)
 648                 gfs2_glock_dq_uninit(&sdp->sd_freeze_gh);
 649
 650         mutex_unlock(&sdp->sd_freeze_lock);
 651 }
 652
 653
 654 /**
 655  * gfs2_write_inode - Make sure the inode is stable on the disk
 656  * @inode: The inode
 657  * @sync: synchronous write flag
 658  *
 659  * Returns: errno
 660  */
 661
 662 static int gfs2_write_inode(struct inode *inode, int sync)
 663 {
 664         struct gfs2_inode *ip = GFS2_I(inode);
 665         struct gfs2_sbd *sdp = GFS2_SB(inode);
 666         struct gfs2_holder gh;
 667         struct buffer_head *bh;
 668         struct timespec atime;
 669         struct gfs2_dinode *di;
 670         int ret = 0;
 671
 672         /* Check this is a "normal" inode, etc */
 673         if (!test_bit(GIF_USER, &ip->i_flags) ||
 674             (current->flags & PF_MEMALLOC))
 675                 return 0;
 676         ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
 677         if (ret)
 678                 goto do_flush;
 679         ret = gfs2_trans_begin(sdp, RES_DINODE, 0);
 680         if (ret)
 681                 goto do_unlock;
 682         ret = gfs2_meta_inode_buffer(ip, &bh);
 683         if (ret == 0) {
 684                 di = (struct gfs2_dinode *)bh->b_data;
 685                 atime.tv_sec = be64_to_cpu(di->di_atime);
 686                 atime.tv_nsec = be32_to_cpu(di->di_atime_nsec);
 687                 if (timespec_compare(&inode->i_atime, &atime) > 0) {
 688                         gfs2_trans_add_bh(ip->i_gl, bh, 1);
 689                         gfs2_dinode_out(ip, bh->b_data);
 690                 }
 691                 brelse(bh);
 692         }
 693         gfs2_trans_end(sdp);
 694 do_unlock:
 695         gfs2_glock_dq_uninit(&gh);
 696 do_flush:
 697         if (sync != 0)
 698                 gfs2_log_flush(GFS2_SB(inode), ip->i_gl);
 699         return ret;
 700 }
 701
 702 /**
 703  * gfs2_make_fs_ro - Turn a Read-Write FS into a Read-Only one
 704  * @sdp: the filesystem
 705  *
 706  * Returns: errno
 707  */
 708
 709 static int gfs2_make_fs_ro(struct gfs2_sbd *sdp)
 710 {
 711         struct gfs2_holder t_gh;
 712         int error;
 713
 714         flush_workqueue(gfs2_delete_workqueue);
 715         gfs2_quota_sync(sdp);
 716         gfs2_statfs_sync(sdp);
 717
 718         error = gfs2_glock_nq_init(sdp->sd_trans_gl, LM_ST_SHARED, GL_NOCACHE,
 719                                    &t_gh);
 720         if (error && !test_bit(SDF_SHUTDOWN, &sdp->sd_flags))
 721                 return error;
 722
 723         gfs2_meta_syncfs(sdp);
 724         gfs2_log_shutdown(sdp);
 725
 726         clear_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags);
 727
 728         if (t_gh.gh_gl)
 729                 gfs2_glock_dq_uninit(&t_gh);
 730
 731         gfs2_quota_cleanup(sdp);
 732
 733         return error;
 734 }
 735
 736 static int gfs2_umount_recovery_wait(void *word)
 737 {
 738         schedule();
 739         return 0;
 740 }
 741
 742 /**
 743  * gfs2_put_super - Unmount the filesystem
 744  * @sb: The VFS superblock
 745  *
 746  */
 747
 748 static void gfs2_put_super(struct super_block *sb)
 749 {
 750         struct gfs2_sbd *sdp = sb->s_fs_info;
 751         int error;
 752         struct gfs2_jdesc *jd;
 753
 754         /*  Unfreeze the filesystem, if we need to  */
 755
 756         mutex_lock(&sdp->sd_freeze_lock);
 757         if (sdp->sd_freeze_count)
 758                 gfs2_glock_dq_uninit(&sdp->sd_freeze_gh);
 759         mutex_unlock(&sdp->sd_freeze_lock);
 760
 761         /* No more recovery requests */
 762         set_bit(SDF_NORECOVERY, &sdp->sd_flags);
 763         smp_mb();
 764
 765         /* Wait on outstanding recovery */
 766 restart:
 767         spin_lock(&sdp->sd_jindex_spin);
 768         list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
 769                 if (!test_bit(JDF_RECOVERY, &jd->jd_flags))
 770                         continue;
 771                 spin_unlock(&sdp->sd_jindex_spin);
 772                 wait_on_bit(&jd->jd_flags, JDF_RECOVERY,
 773                             gfs2_umount_recovery_wait, TASK_UNINTERRUPTIBLE);
 774                 goto restart;
 775         }
 776         spin_unlock(&sdp->sd_jindex_spin);
 777
 778         kthread_stop(sdp->sd_quotad_process);
 779         kthread_stop(sdp->sd_logd_process);
 780
 781         if (!(sb->s_flags & MS_RDONLY)) {
 782                 error = gfs2_make_fs_ro(sdp);
 783                 if (error)
 784                         gfs2_io_error(sdp);
 785         }
 786         /*  At this point, we're through modifying the disk  */
 787
 788         /*  Release stuff  */
 789
 790         iput(sdp->sd_jindex);
 791         iput(sdp->sd_inum_inode);
 792         iput(sdp->sd_statfs_inode);
 793         iput(sdp->sd_rindex);
 794         iput(sdp->sd_quota_inode);
 795
 796         gfs2_glock_put(sdp->sd_rename_gl);
 797         gfs2_glock_put(sdp->sd_trans_gl);
 798
 799         if (!sdp->sd_args.ar_spectator) {
 800                 gfs2_glock_dq_uninit(&sdp->sd_journal_gh);
 801                 gfs2_glock_dq_uninit(&sdp->sd_jinode_gh);
 802                 gfs2_glock_dq_uninit(&sdp->sd_ir_gh);
 803                 gfs2_glock_dq_uninit(&sdp->sd_sc_gh);
 804                 gfs2_glock_dq_uninit(&sdp->sd_qc_gh);
 805                 iput(sdp->sd_ir_inode);
 806                 iput(sdp->sd_sc_inode);
 807                 iput(sdp->sd_qc_inode);
 808         }
 809
 810         gfs2_glock_dq_uninit(&sdp->sd_live_gh);
 811         gfs2_clear_rgrpd(sdp);
 812         gfs2_jindex_free(sdp);
 813         /*  Take apart glock structures and buffer lists  */
 814         gfs2_gl_hash_clear(sdp);
 815         /*  Unmount the locking protocol  */
 816         gfs2_lm_unmount(sdp);
 817
 818         /*  At this point, we're through participating in the lockspace  */
 819         gfs2_sys_fs_del(sdp);
 820 }
 821
 822 /**
 823  * gfs2_sync_fs - sync the filesystem
 824  * @sb: the superblock
 825  *
 826  * Flushes the log to disk.
 827  */
 828
 829 static int gfs2_sync_fs(struct super_block *sb, int wait)
 830 {
 831         if (wait && sb->s_fs_info)
 832                 gfs2_log_flush(sb->s_fs_info, NULL);
 833         return 0;
 834 }
 835
 836 /**
 837  * gfs2_freeze - prevent further writes to the filesystem
 838  * @sb: the VFS structure for the filesystem
 839  *
 840  */
 841
 842 static int gfs2_freeze(struct super_block *sb)
 843 {
 844         struct gfs2_sbd *sdp = sb->s_fs_info;
 845         int error;
 846
 847         if (test_bit(SDF_SHUTDOWN, &sdp->sd_flags))
 848                 return -EINVAL;
 849
 850         for (;;) {
 851                 error = gfs2_freeze_fs(sdp);
 852                 if (!error)
 853                         break;
 854
 855                 switch (error) {
 856                 case -EBUSY:
 857                         fs_err(sdp, "waiting for recovery before freeze\n");
 858                         break;
 859
 860                 default:
 861                         fs_err(sdp, "error freezing FS: %d\n", error);
 862                         break;
 863                 }
 864
 865                 fs_err(sdp, "retrying...\n");
 866                 msleep(1000);
 867         }
 868         return 0;
 869 }
 870
 871 /**
 872  * gfs2_unfreeze - reallow writes to the filesystem
 873  * @sb: the VFS structure for the filesystem
 874  *
 875  */
 876
 877 static int gfs2_unfreeze(struct super_block *sb)
 878 {
 879         gfs2_unfreeze_fs(sb->s_fs_info);
 880         return 0;
 881 }
 882
 883 /**
 884  * statfs_fill - fill in the sg for a given RG
 885  * @rgd: the RG
 886  * @sc: the sc structure
 887  *
 888  * Returns: 0 on success, -ESTALE if the LVB is invalid
 889  */
 890
 891 static int statfs_slow_fill(struct gfs2_rgrpd *rgd,
 892                             struct gfs2_statfs_change_host *sc)
 893 {
 894         gfs2_rgrp_verify(rgd);
 895         sc->sc_total += rgd->rd_data;
 896         sc->sc_free += rgd->rd_free;
 897         sc->sc_dinodes += rgd->rd_dinodes;
 898         return 0;
 899 }
 900
 901 /**
 902  * gfs2_statfs_slow - Stat a filesystem using asynchronous locking
 903  * @sdp: the filesystem
 904  * @sc: the sc info that will be returned
 905  *
 906  * Any error (other than a signal) will cause this routine to fall back
 907  * to the synchronous version.
 908  *
 909  * FIXME: This really shouldn't busy wait like this.
 910  *
 911  * Returns: errno
 912  */
 913
 914 static int gfs2_statfs_slow(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *sc)
 915 {
 916         struct gfs2_holder ri_gh;
 917         struct gfs2_rgrpd *rgd_next;
 918         struct gfs2_holder *gha, *gh;
 919         unsigned int slots = 64;
 920         unsigned int x;
 921         int done;
 922         int error = 0, err;
 923
 924         memset(sc, 0, sizeof(struct gfs2_statfs_change_host));
 925         gha = kcalloc(slots, sizeof(struct gfs2_holder), GFP_KERNEL);
 926         if (!gha)
 927                 return -ENOMEM;
 928
 929         error = gfs2_rindex_hold(sdp, &ri_gh);
 930         if (error)
 931                 goto out;
 932
 933         rgd_next = gfs2_rgrpd_get_first(sdp);
 934
 935         for (;;) {
 936                 done = 1;
 937
 938                 for (x = 0; x < slots; x++) {
 939                         gh = gha + x;
 940
 941                         if (gh->gh_gl && gfs2_glock_poll(gh)) {
 942                                 err = gfs2_glock_wait(gh);
 943                                 if (err) {
 944                                         gfs2_holder_uninit(gh);
 945                                         error = err;
 946                                 } else {
 947                                         if (!error)
 948                                                 error = statfs_slow_fill(
 949                                                         gh->gh_gl->gl_object, sc);
 950                                         gfs2_glock_dq_uninit(gh);
 951                                 }
 952                         }
 953
 954                         if (gh->gh_gl)
 955                                 done = 0;
 956                         else if (rgd_next && !error) {
 957                                 error = gfs2_glock_nq_init(rgd_next->rd_gl,
 958                                                            LM_ST_SHARED,
 959                                                            GL_ASYNC,
 960                                                            gh);
 961                                 rgd_next = gfs2_rgrpd_get_next(rgd_next);
 962                                 done = 0;
 963                         }
 964
 965                         if (signal_pending(current))
 966                                 error = -ERESTARTSYS;
 967                 }
 968
 969                 if (done)
 970                         break;
 971
 972                 yield();
 973         }
 974
 975         gfs2_glock_dq_uninit(&ri_gh);
 976
 977 out:
 978         kfree(gha);
 979         return error;
 980 }
 981
 982 /**
 983  * gfs2_statfs_i - Do a statfs
 984  * @sdp: the filesystem
 985  * @sg: the sg structure
 986  *
 987  * Returns: errno
 988  */
 989
 990 static int gfs2_statfs_i(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *sc)
 991 {
 992         struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
 993         struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
 994
 995         spin_lock(&sdp->sd_statfs_spin);
 996
 997         *sc = *m_sc;
 998         sc->sc_total += l_sc->sc_total;
 999         sc->sc_free += l_sc->sc_free;
1000         sc->sc_dinodes += l_sc->sc_dinodes;
1001
1002         spin_unlock(&sdp->sd_statfs_spin);
1003
1004         if (sc->sc_free < 0)
1005                 sc->sc_free = 0;
1006         if (sc->sc_free > sc->sc_total)
1007                 sc->sc_free = sc->sc_total;
1008         if (sc->sc_dinodes < 0)
1009                 sc->sc_dinodes = 0;
1010
1011         return 0;
1012 }
1013
1014 /**
1015  * gfs2_statfs - Gather and return stats about the filesystem
1016  * @sb: The superblock
1017  * @statfsbuf: The buffer
1018  *
1019  * Returns: 0 on success or error code
1020  */
1021
1022 static int gfs2_statfs(struct dentry *dentry, struct kstatfs *buf)
1023 {
1024         struct super_block *sb = dentry->d_inode->i_sb;
1025         struct gfs2_sbd *sdp = sb->s_fs_info;
1026         struct gfs2_statfs_change_host sc;
1027         int error;
1028
1029         if (gfs2_tune_get(sdp, gt_statfs_slow))
1030                 error = gfs2_statfs_slow(sdp, &sc);
1031         else
1032                 error = gfs2_statfs_i(sdp, &sc);
1033
1034         if (error)
1035                 return error;
1036
1037         buf->f_type = GFS2_MAGIC;
1038         buf->f_bsize = sdp->sd_sb.sb_bsize;
1039         buf->f_blocks = sc.sc_total;
1040         buf->f_bfree = sc.sc_free;
1041         buf->f_bavail = sc.sc_free;
1042         buf->f_files = sc.sc_dinodes + sc.sc_free;
1043         buf->f_ffree = sc.sc_free;
1044         buf->f_namelen = GFS2_FNAMESIZE;
1045
1046         return 0;
1047 }
1048
1049 /**
1050  * gfs2_remount_fs - called when the FS is remounted
1051  * @sb:  the filesystem
1052  * @flags:  the remount flags
1053  * @data:  extra data passed in (not used right now)
1054  *
1055  * Returns: errno
1056  */
1057
1058 static int gfs2_remount_fs(struct super_block *sb, int *flags, char *data)
1059 {
1060         struct gfs2_sbd *sdp = sb->s_fs_info;
1061         struct gfs2_args args = sdp->sd_args; /* Default to current settings */
1062         struct gfs2_tune *gt = &sdp->sd_tune;
1063         int error;
1064
1065         spin_lock(&gt->gt_spin);
1066         args.ar_commit = gt->gt_log_flush_secs;
1067         spin_unlock(&gt->gt_spin);
1068         error = gfs2_mount_args(sdp, &args, data);
1069         if (error)
1070                 return error;
1071
1072         /* Not allowed to change locking details */
1073         if (strcmp(args.ar_lockproto, sdp->sd_args.ar_lockproto) ||
1074             strcmp(args.ar_locktable, sdp->sd_args.ar_locktable) ||
1075             strcmp(args.ar_hostdata, sdp->sd_args.ar_hostdata))
1076                 return -EINVAL;
1077
1078         /* Some flags must not be changed */
1079         if (args_neq(&args, &sdp->sd_args, spectator) ||
1080             args_neq(&args, &sdp->sd_args, ignore_local_fs) ||
1081             args_neq(&args, &sdp->sd_args, localflocks) ||
1082             args_neq(&args, &sdp->sd_args, localcaching) ||
1083             args_neq(&args, &sdp->sd_args, meta))
1084                 return -EINVAL;
1085
1086         if (sdp->sd_args.ar_spectator)
1087                 *flags |= MS_RDONLY;
1088
1089         if ((sb->s_flags ^ *flags) & MS_RDONLY) {
1090                 if (*flags & MS_RDONLY)
1091                         error = gfs2_make_fs_ro(sdp);
1092                 else
1093                         error = gfs2_make_fs_rw(sdp);
1094                 if (error)
1095                         return error;
1096         }
1097
1098         sdp->sd_args = args;
1099         if (sdp->sd_args.ar_posix_acl)
1100                 sb->s_flags |= MS_POSIXACL;
1101         else
1102                 sb->s_flags &= ~MS_POSIXACL;
1103         spin_lock(&gt->gt_spin);
1104         gt->gt_log_flush_secs = args.ar_commit;
1105         spin_unlock(&gt->gt_spin);
1106
1107         gfs2_online_uevent(sdp);
1108         return 0;
1109 }
1110
1111 /**
1112  * gfs2_drop_inode - Drop an inode (test for remote unlink)
1113  * @inode: The inode to drop
1114  *
1115  * If we've received a callback on an iopen lock then its because a
1116  * remote node tried to deallocate the inode but failed due to this node
1117  * still having the inode open. Here we mark the link count zero
1118  * since we know that it must have reached zero if the GLF_DEMOTE flag
1119  * is set on the iopen glock. If we didn't do a disk read since the
1120  * remote node removed the final link then we might otherwise miss
1121  * this event. This check ensures that this node will deallocate the
1122  * inode's blocks, or alternatively pass the baton on to another
1123  * node for later deallocation.
1124  */
1125
1126 static void gfs2_drop_inode(struct inode *inode)
1127 {
1128         struct gfs2_inode *ip = GFS2_I(inode);
1129
1130         if (test_bit(GIF_USER, &ip->i_flags) && inode->i_nlink) {
1131                 struct gfs2_glock *gl = ip->i_iopen_gh.gh_gl;
1132                 if (gl && test_bit(GLF_DEMOTE, &gl->gl_flags))
1133                         clear_nlink(inode);
1134         }
1135         generic_drop_inode(inode);
1136 }
1137
1138 /**
1139  * gfs2_clear_inode - Deallocate an inode when VFS is done with it
1140  * @inode: The VFS inode
1141  *
1142  */
1143
1144 static void gfs2_clear_inode(struct inode *inode)
1145 {
1146         struct gfs2_inode *ip = GFS2_I(inode);
1147
1148         /* This tells us its a "real" inode and not one which only
1149          * serves to contain an address space (see rgrp.c, meta_io.c)
1150          * which therefore doesn't have its own glocks.
1151          */
1152         if (test_bit(GIF_USER, &ip->i_flags)) {
1153                 ip->i_gl->gl_object = NULL;
1154                 gfs2_glock_put(ip->i_gl);
1155                 ip->i_gl = NULL;
1156                 if (ip->i_iopen_gh.gh_gl) {
1157                         ip->i_iopen_gh.gh_gl->gl_object = NULL;
1158                         gfs2_glock_dq_uninit(&ip->i_iopen_gh);
1159                 }
1160         }
1161 }
1162
1163 static int is_ancestor(const struct dentry *d1, const struct dentry *d2)
1164 {
1165         do {
1166                 if (d1 == d2)
1167                         return 1;
1168                 d1 = d1->d_parent;
1169         } while (!IS_ROOT(d1));
1170         return 0;
1171 }
1172
1173 /**
1174  * gfs2_show_options - Show mount options for /proc/mounts
1175  * @s: seq_file structure
1176  * @mnt: vfsmount
1177  *
1178  * Returns: 0 on success or error code
1179  */
1180
1181 static int gfs2_show_options(struct seq_file *s, struct vfsmount *mnt)
1182 {
1183         struct gfs2_sbd *sdp = mnt->mnt_sb->s_fs_info;
1184         struct gfs2_args *args = &sdp->sd_args;
1185         int lfsecs;
1186
1187         if (is_ancestor(mnt->mnt_root, sdp->sd_master_dir))
1188                 seq_printf(s, ",meta");
1189         if (args->ar_lockproto[0])
1190                 seq_printf(s, ",lockproto=%s", args->ar_lockproto);
1191         if (args->ar_locktable[0])
1192                 seq_printf(s, ",locktable=%s", args->ar_locktable);
1193         if (args->ar_hostdata[0])
1194                 seq_printf(s, ",hostdata=%s", args->ar_hostdata);
1195         if (args->ar_spectator)
1196                 seq_printf(s, ",spectator");
1197         if (args->ar_ignore_local_fs)
1198                 seq_printf(s, ",ignore_local_fs");
1199         if (args->ar_localflocks)
1200                 seq_printf(s, ",localflocks");
1201         if (args->ar_localcaching)
1202                 seq_printf(s, ",localcaching");
1203         if (args->ar_debug)
1204                 seq_printf(s, ",debug");
1205         if (args->ar_upgrade)
1206                 seq_printf(s, ",upgrade");
1207         if (args->ar_posix_acl)
1208                 seq_printf(s, ",acl");
1209         if (args->ar_quota != GFS2_QUOTA_DEFAULT) {
1210                 char *state;
1211                 switch (args->ar_quota) {
1212                 case GFS2_QUOTA_OFF:
1213                         state = "off";
1214                         break;
1215                 case GFS2_QUOTA_ACCOUNT:
1216                         state = "account";
1217                         break;
1218                 case GFS2_QUOTA_ON:
1219                         state = "on";
1220                         break;
1221                 default:
1222                         state = "unknown";
1223                         break;
1224                 }
1225                 seq_printf(s, ",quota=%s", state);
1226         }
1227         if (args->ar_suiddir)
1228                 seq_printf(s, ",suiddir");
1229         if (args->ar_data != GFS2_DATA_DEFAULT) {
1230                 char *state;
1231                 switch (args->ar_data) {
1232                 case GFS2_DATA_WRITEBACK:
1233                         state = "writeback";
1234                         break;
1235                 case GFS2_DATA_ORDERED:
1236                         state = "ordered";
1237                         break;
1238                 default:
1239                         state = "unknown";
1240                         break;
1241                 }
1242                 seq_printf(s, ",data=%s", state);
1243         }
1244         if (args->ar_discard)
1245                 seq_printf(s, ",discard");
1246         lfsecs = sdp->sd_tune.gt_log_flush_secs;
1247         if (lfsecs != 60)
1248                 seq_printf(s, ",commit=%d", lfsecs);
1249         if (args->ar_errors != GFS2_ERRORS_DEFAULT) {
1250                 const char *state;
1251
1252                 switch (args->ar_errors) {
1253                 case GFS2_ERRORS_WITHDRAW:
1254                         state = "withdraw";
1255                         break;
1256                 case GFS2_ERRORS_PANIC:
1257                         state = "panic";
1258                         break;
1259                 default:
1260                         state = "unknown";
1261                         break;
1262                 }
1263                 seq_printf(s, ",errors=%s", state);
1264         }
1265         return 0;
1266 }
1267
1268 /*
1269  * We have to (at the moment) hold the inodes main lock to cover
1270  * the gap between unlocking the shared lock on the iopen lock and
1271  * taking the exclusive lock. I'd rather do a shared -> exclusive
1272  * conversion on the iopen lock, but we can change that later. This
1273  * is safe, just less efficient.
1274  */
1275
1276 static void gfs2_delete_inode(struct inode *inode)
1277 {
1278         struct gfs2_sbd *sdp = inode->i_sb->s_fs_info;
1279         struct gfs2_inode *ip = GFS2_I(inode);
1280         struct gfs2_holder gh;
1281         int error;
1282
1283         if (!test_bit(GIF_USER, &ip->i_flags))
1284                 goto out;
1285
1286         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
1287         if (unlikely(error)) {
1288                 gfs2_glock_dq_uninit(&ip->i_iopen_gh);
1289                 goto out;
1290         }
1291
1292         gfs2_glock_dq_wait(&ip->i_iopen_gh);
1293         gfs2_holder_reinit(LM_ST_EXCLUSIVE, LM_FLAG_TRY_1CB | GL_NOCACHE, &ip->i_iopen_gh);
1294         error = gfs2_glock_nq(&ip->i_iopen_gh);
1295         if (error)
1296                 goto out_truncate;
1297
1298         if (S_ISDIR(inode->i_mode) &&
1299             (ip->i_diskflags & GFS2_DIF_EXHASH)) {
1300                 error = gfs2_dir_exhash_dealloc(ip);
1301                 if (error)
1302                         goto out_unlock;
1303         }
1304
1305         if (ip->i_eattr) {
1306                 error = gfs2_ea_dealloc(ip);
1307                 if (error)
1308                         goto out_unlock;
1309         }
1310
1311         if (!gfs2_is_stuffed(ip)) {
1312                 error = gfs2_file_dealloc(ip);
1313                 if (error)
1314                         goto out_unlock;
1315         }
1316
1317         error = gfs2_dinode_dealloc(ip);
1318         if (error)
1319                 goto out_unlock;
1320
1321 out_truncate:
1322         error = gfs2_trans_begin(sdp, 0, sdp->sd_jdesc->jd_blocks);
1323         if (error)
1324                 goto out_unlock;
1325         /* Needs to be done before glock release & also in a transaction */
1326         truncate_inode_pages(&inode->i_data, 0);
1327         gfs2_trans_end(sdp);
1328
1329 out_unlock:
1330         if (test_bit(HIF_HOLDER, &ip->i_iopen_gh.gh_iflags))
1331                 gfs2_glock_dq(&ip->i_iopen_gh);
1332         gfs2_holder_uninit(&ip->i_iopen_gh);
1333         gfs2_glock_dq_uninit(&gh);
1334         if (error && error != GLR_TRYFAILED && error != -EROFS)
1335                 fs_warn(sdp, "gfs2_delete_inode: %d\n", error);
1336 out:
1337         truncate_inode_pages(&inode->i_data, 0);
1338         clear_inode(inode);
1339 }
1340
1341 static struct inode *gfs2_alloc_inode(struct super_block *sb)
1342 {
1343         struct gfs2_inode *ip;
1344
1345         ip = kmem_cache_alloc(gfs2_inode_cachep, GFP_KERNEL);
1346         if (ip) {
1347                 ip->i_flags = 0;
1348                 ip->i_gl = NULL;
1349         }
1350         return &ip->i_inode;
1351 }
1352
1353 static void gfs2_destroy_inode(struct inode *inode)
1354 {
1355         kmem_cache_free(gfs2_inode_cachep, inode);
1356 }
1357
1358 const struct super_operations gfs2_super_ops = {
1359         .alloc_inode            = gfs2_alloc_inode,
1360         .destroy_inode          = gfs2_destroy_inode,
1361         .write_inode            = gfs2_write_inode,
1362         .delete_inode           = gfs2_delete_inode,
1363         .put_super              = gfs2_put_super,
1364         .sync_fs                = gfs2_sync_fs,
1365         .freeze_fs              = gfs2_freeze,
1366         .unfreeze_fs            = gfs2_unfreeze,
1367         .statfs                 = gfs2_statfs,
1368         .remount_fs             = gfs2_remount_fs,
1369         .clear_inode            = gfs2_clear_inode,
1370         .drop_inode             = gfs2_drop_inode,
1371         .show_options           = gfs2_show_options,
1372 };
1373