fs/gfs2/ops_super.c

   1 /*
   2  * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
   3  * Copyright (C) 2004-2008 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/sched.h>
  11 #include <linux/slab.h>
  12 #include <linux/spinlock.h>
  13 #include <linux/completion.h>
  14 #include <linux/buffer_head.h>
  15 #include <linux/statfs.h>
  16 #include <linux/seq_file.h>
  17 #include <linux/mount.h>
  18 #include <linux/kthread.h>
  19 #include <linux/delay.h>
  20 #include <linux/gfs2_ondisk.h>
  21 #include <linux/crc32.h>
  22 #include <linux/time.h>
  23
  24 #include "gfs2.h"
  25 #include "incore.h"
  26 #include "glock.h"
  27 #include "inode.h"
  28 #include "log.h"
  29 #include "quota.h"
  30 #include "recovery.h"
  31 #include "rgrp.h"
  32 #include "super.h"
  33 #include "sys.h"
  34 #include "util.h"
  35 #include "trans.h"
  36 #include "dir.h"
  37 #include "eattr.h"
  38 #include "bmap.h"
  39 #include "meta_io.h"
  40
  41 #define args_neq(a1, a2, x) ((a1)->ar_##x != (a2)->ar_##x)
  42
  43 /**
  44  * gfs2_write_inode - Make sure the inode is stable on the disk
  45  * @inode: The inode
  46  * @sync: synchronous write flag
  47  *
  48  * Returns: errno
  49  */
  50
  51 static int gfs2_write_inode(struct inode *inode, int sync)
  52 {
  53         struct gfs2_inode *ip = GFS2_I(inode);
  54         struct gfs2_sbd *sdp = GFS2_SB(inode);
  55         struct gfs2_holder gh;
  56         struct buffer_head *bh;
  57         struct timespec atime;
  58         struct gfs2_dinode *di;
  59         int ret = 0;
  60
  61         /* Check this is a "normal" inode, etc */
  62         if (!test_bit(GIF_USER, &ip->i_flags) ||
  63             (current->flags & PF_MEMALLOC))
  64                 return 0;
  65         ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
  66         if (ret)
  67                 goto do_flush;
  68         ret = gfs2_trans_begin(sdp, RES_DINODE, 0);
  69         if (ret)
  70                 goto do_unlock;
  71         ret = gfs2_meta_inode_buffer(ip, &bh);
  72         if (ret == 0) {
  73                 di = (struct gfs2_dinode *)bh->b_data;
  74                 atime.tv_sec = be64_to_cpu(di->di_atime);
  75                 atime.tv_nsec = be32_to_cpu(di->di_atime_nsec);
  76                 if (timespec_compare(&inode->i_atime, &atime) > 0) {
  77                         gfs2_trans_add_bh(ip->i_gl, bh, 1);
  78                         gfs2_dinode_out(ip, bh->b_data);
  79                 }
  80                 brelse(bh);
  81         }
  82         gfs2_trans_end(sdp);
  83 do_unlock:
  84         gfs2_glock_dq_uninit(&gh);
  85 do_flush:
  86         if (sync != 0)
  87                 gfs2_log_flush(GFS2_SB(inode), ip->i_gl);
  88         return ret;
  89 }
  90
  91 /**
  92  * gfs2_make_fs_ro - Turn a Read-Write FS into a Read-Only one
  93  * @sdp: the filesystem
  94  *
  95  * Returns: errno
  96  */
  97
  98 static int gfs2_make_fs_ro(struct gfs2_sbd *sdp)
  99 {
 100         struct gfs2_holder t_gh;
 101         int error;
 102
 103         gfs2_quota_sync(sdp);
 104         gfs2_statfs_sync(sdp);
 105
 106         error = gfs2_glock_nq_init(sdp->sd_trans_gl, LM_ST_SHARED, GL_NOCACHE,
 107                                    &t_gh);
 108         if (error && !test_bit(SDF_SHUTDOWN, &sdp->sd_flags))
 109                 return error;
 110
 111         gfs2_meta_syncfs(sdp);
 112         gfs2_log_shutdown(sdp);
 113
 114         clear_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags);
 115
 116         if (t_gh.gh_gl)
 117                 gfs2_glock_dq_uninit(&t_gh);
 118
 119         gfs2_quota_cleanup(sdp);
 120
 121         return error;
 122 }
 123
 124 /**
 125  * gfs2_put_super - Unmount the filesystem
 126  * @sb: The VFS superblock
 127  *
 128  */
 129
 130 static void gfs2_put_super(struct super_block *sb)
 131 {
 132         struct gfs2_sbd *sdp = sb->s_fs_info;
 133         int error;
 134
 135         /*  Unfreeze the filesystem, if we need to  */
 136
 137         mutex_lock(&sdp->sd_freeze_lock);
 138         if (sdp->sd_freeze_count)
 139                 gfs2_glock_dq_uninit(&sdp->sd_freeze_gh);
 140         mutex_unlock(&sdp->sd_freeze_lock);
 141
 142         kthread_stop(sdp->sd_quotad_process);
 143         kthread_stop(sdp->sd_logd_process);
 144         kthread_stop(sdp->sd_recoverd_process);
 145
 146         if (!(sb->s_flags & MS_RDONLY)) {
 147                 error = gfs2_make_fs_ro(sdp);
 148                 if (error)
 149                         gfs2_io_error(sdp);
 150         }
 151         /*  At this point, we're through modifying the disk  */
 152
 153         /*  Release stuff  */
 154
 155         iput(sdp->sd_jindex);
 156         iput(sdp->sd_inum_inode);
 157         iput(sdp->sd_statfs_inode);
 158         iput(sdp->sd_rindex);
 159         iput(sdp->sd_quota_inode);
 160
 161         gfs2_glock_put(sdp->sd_rename_gl);
 162         gfs2_glock_put(sdp->sd_trans_gl);
 163
 164         if (!sdp->sd_args.ar_spectator) {
 165                 gfs2_glock_dq_uninit(&sdp->sd_journal_gh);
 166                 gfs2_glock_dq_uninit(&sdp->sd_jinode_gh);
 167                 gfs2_glock_dq_uninit(&sdp->sd_ir_gh);
 168                 gfs2_glock_dq_uninit(&sdp->sd_sc_gh);
 169                 gfs2_glock_dq_uninit(&sdp->sd_qc_gh);
 170                 iput(sdp->sd_ir_inode);
 171                 iput(sdp->sd_sc_inode);
 172                 iput(sdp->sd_qc_inode);
 173         }
 174
 175         gfs2_glock_dq_uninit(&sdp->sd_live_gh);
 176         gfs2_clear_rgrpd(sdp);
 177         gfs2_jindex_free(sdp);
 178         /*  Take apart glock structures and buffer lists  */
 179         gfs2_gl_hash_clear(sdp);
 180         /*  Unmount the locking protocol  */
 181         gfs2_lm_unmount(sdp);
 182
 183         /*  At this point, we're through participating in the lockspace  */
 184         gfs2_sys_fs_del(sdp);
 185 }
 186
 187 /**
 188  * gfs2_write_super
 189  * @sb: the superblock
 190  *
 191  */
 192
 193 static void gfs2_write_super(struct super_block *sb)
 194 {
 195         sb->s_dirt = 0;
 196 }
 197
 198 /**
 199  * gfs2_sync_fs - sync the filesystem
 200  * @sb: the superblock
 201  *
 202  * Flushes the log to disk.
 203  */
 204
 205 static int gfs2_sync_fs(struct super_block *sb, int wait)
 206 {
 207         sb->s_dirt = 0;
 208         if (wait && sb->s_fs_info)
 209                 gfs2_log_flush(sb->s_fs_info, NULL);
 210         return 0;
 211 }
 212
 213 /**
 214  * gfs2_freeze - prevent further writes to the filesystem
 215  * @sb: the VFS structure for the filesystem
 216  *
 217  */
 218
 219 static int gfs2_freeze(struct super_block *sb)
 220 {
 221         struct gfs2_sbd *sdp = sb->s_fs_info;
 222         int error;
 223
 224         if (test_bit(SDF_SHUTDOWN, &sdp->sd_flags))
 225                 return -EINVAL;
 226
 227         for (;;) {
 228                 error = gfs2_freeze_fs(sdp);
 229                 if (!error)
 230                         break;
 231
 232                 switch (error) {
 233                 case -EBUSY:
 234                         fs_err(sdp, "waiting for recovery before freeze\n");
 235                         break;
 236
 237                 default:
 238                         fs_err(sdp, "error freezing FS: %d\n", error);
 239                         break;
 240                 }
 241
 242                 fs_err(sdp, "retrying...\n");
 243                 msleep(1000);
 244         }
 245         return 0;
 246 }
 247
 248 /**
 249  * gfs2_unfreeze - reallow writes to the filesystem
 250  * @sb: the VFS structure for the filesystem
 251  *
 252  */
 253
 254 static int gfs2_unfreeze(struct super_block *sb)
 255 {
 256         gfs2_unfreeze_fs(sb->s_fs_info);
 257         return 0;
 258 }
 259
 260 /**
 261  * statfs_fill - fill in the sg for a given RG
 262  * @rgd: the RG
 263  * @sc: the sc structure
 264  *
 265  * Returns: 0 on success, -ESTALE if the LVB is invalid
 266  */
 267
 268 static int statfs_slow_fill(struct gfs2_rgrpd *rgd,
 269                             struct gfs2_statfs_change_host *sc)
 270 {
 271         gfs2_rgrp_verify(rgd);
 272         sc->sc_total += rgd->rd_data;
 273         sc->sc_free += rgd->rd_free;
 274         sc->sc_dinodes += rgd->rd_dinodes;
 275         return 0;
 276 }
 277
 278 /**
 279  * gfs2_statfs_slow - Stat a filesystem using asynchronous locking
 280  * @sdp: the filesystem
 281  * @sc: the sc info that will be returned
 282  *
 283  * Any error (other than a signal) will cause this routine to fall back
 284  * to the synchronous version.
 285  *
 286  * FIXME: This really shouldn't busy wait like this.
 287  *
 288  * Returns: errno
 289  */
 290
 291 static int gfs2_statfs_slow(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *sc)
 292 {
 293         struct gfs2_holder ri_gh;
 294         struct gfs2_rgrpd *rgd_next;
 295         struct gfs2_holder *gha, *gh;
 296         unsigned int slots = 64;
 297         unsigned int x;
 298         int done;
 299         int error = 0, err;
 300
 301         memset(sc, 0, sizeof(struct gfs2_statfs_change_host));
 302         gha = kcalloc(slots, sizeof(struct gfs2_holder), GFP_KERNEL);
 303         if (!gha)
 304                 return -ENOMEM;
 305
 306         error = gfs2_rindex_hold(sdp, &ri_gh);
 307         if (error)
 308                 goto out;
 309
 310         rgd_next = gfs2_rgrpd_get_first(sdp);
 311
 312         for (;;) {
 313                 done = 1;
 314
 315                 for (x = 0; x < slots; x++) {
 316                         gh = gha + x;
 317
 318                         if (gh->gh_gl && gfs2_glock_poll(gh)) {
 319                                 err = gfs2_glock_wait(gh);
 320                                 if (err) {
 321                                         gfs2_holder_uninit(gh);
 322                                         error = err;
 323                                 } else {
 324                                         if (!error)
 325                                                 error = statfs_slow_fill(
 326                                                         gh->gh_gl->gl_object, sc);
 327                                         gfs2_glock_dq_uninit(gh);
 328                                 }
 329                         }
 330
 331                         if (gh->gh_gl)
 332                                 done = 0;
 333                         else if (rgd_next && !error) {
 334                                 error = gfs2_glock_nq_init(rgd_next->rd_gl,
 335                                                            LM_ST_SHARED,
 336                                                            GL_ASYNC,
 337                                                            gh);
 338                                 rgd_next = gfs2_rgrpd_get_next(rgd_next);
 339                                 done = 0;
 340                         }
 341
 342                         if (signal_pending(current))
 343                                 error = -ERESTARTSYS;
 344                 }
 345
 346                 if (done)
 347                         break;
 348
 349                 yield();
 350         }
 351
 352         gfs2_glock_dq_uninit(&ri_gh);
 353
 354 out:
 355         kfree(gha);
 356         return error;
 357 }
 358
 359 /**
 360  * gfs2_statfs_i - Do a statfs
 361  * @sdp: the filesystem
 362  * @sg: the sg structure
 363  *
 364  * Returns: errno
 365  */
 366
 367 static int gfs2_statfs_i(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *sc)
 368 {
 369         struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
 370         struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
 371
 372         spin_lock(&sdp->sd_statfs_spin);
 373
 374         *sc = *m_sc;
 375         sc->sc_total += l_sc->sc_total;
 376         sc->sc_free += l_sc->sc_free;
 377         sc->sc_dinodes += l_sc->sc_dinodes;
 378
 379         spin_unlock(&sdp->sd_statfs_spin);
 380
 381         if (sc->sc_free < 0)
 382                 sc->sc_free = 0;
 383         if (sc->sc_free > sc->sc_total)
 384                 sc->sc_free = sc->sc_total;
 385         if (sc->sc_dinodes < 0)
 386                 sc->sc_dinodes = 0;
 387
 388         return 0;
 389 }
 390
 391 /**
 392  * gfs2_statfs - Gather and return stats about the filesystem
 393  * @sb: The superblock
 394  * @statfsbuf: The buffer
 395  *
 396  * Returns: 0 on success or error code
 397  */
 398
 399 static int gfs2_statfs(struct dentry *dentry, struct kstatfs *buf)
 400 {
 401         struct super_block *sb = dentry->d_inode->i_sb;
 402         struct gfs2_sbd *sdp = sb->s_fs_info;
 403         struct gfs2_statfs_change_host sc;
 404         int error;
 405
 406         if (gfs2_tune_get(sdp, gt_statfs_slow))
 407                 error = gfs2_statfs_slow(sdp, &sc);
 408         else
 409                 error = gfs2_statfs_i(sdp, &sc);
 410
 411         if (error)
 412                 return error;
 413
 414         buf->f_type = GFS2_MAGIC;
 415         buf->f_bsize = sdp->sd_sb.sb_bsize;
 416         buf->f_blocks = sc.sc_total;
 417         buf->f_bfree = sc.sc_free;
 418         buf->f_bavail = sc.sc_free;
 419         buf->f_files = sc.sc_dinodes + sc.sc_free;
 420         buf->f_ffree = sc.sc_free;
 421         buf->f_namelen = GFS2_FNAMESIZE;
 422
 423         return 0;
 424 }
 425
 426 /**
 427  * gfs2_remount_fs - called when the FS is remounted
 428  * @sb:  the filesystem
 429  * @flags:  the remount flags
 430  * @data:  extra data passed in (not used right now)
 431  *
 432  * Returns: errno
 433  */
 434
 435 static int gfs2_remount_fs(struct super_block *sb, int *flags, char *data)
 436 {
 437         struct gfs2_sbd *sdp = sb->s_fs_info;
 438         struct gfs2_args args = sdp->sd_args; /* Default to current settings */
 439         int error;
 440
 441         error = gfs2_mount_args(sdp, &args, data);
 442         if (error)
 443                 return error;
 444
 445         /* Not allowed to change locking details */
 446         if (strcmp(args.ar_lockproto, sdp->sd_args.ar_lockproto) ||
 447             strcmp(args.ar_locktable, sdp->sd_args.ar_locktable) ||
 448             strcmp(args.ar_hostdata, sdp->sd_args.ar_hostdata))
 449                 return -EINVAL;
 450
 451         /* Some flags must not be changed */
 452         if (args_neq(&args, &sdp->sd_args, spectator) ||
 453             args_neq(&args, &sdp->sd_args, ignore_local_fs) ||
 454             args_neq(&args, &sdp->sd_args, localflocks) ||
 455             args_neq(&args, &sdp->sd_args, localcaching) ||
 456             args_neq(&args, &sdp->sd_args, meta))
 457                 return -EINVAL;
 458
 459         if (sdp->sd_args.ar_spectator)
 460                 *flags |= MS_RDONLY;
 461
 462         if ((sb->s_flags ^ *flags) & MS_RDONLY) {
 463                 if (*flags & MS_RDONLY)
 464                         error = gfs2_make_fs_ro(sdp);
 465                 else
 466                         error = gfs2_make_fs_rw(sdp);
 467                 if (error)
 468                         return error;
 469         }
 470
 471         sdp->sd_args = args;
 472         if (sdp->sd_args.ar_posix_acl)
 473                 sb->s_flags |= MS_POSIXACL;
 474         else
 475                 sb->s_flags &= ~MS_POSIXACL;
 476         return 0;
 477 }
 478
 479 /**
 480  * gfs2_drop_inode - Drop an inode (test for remote unlink)
 481  * @inode: The inode to drop
 482  *
 483  * If we've received a callback on an iopen lock then its because a
 484  * remote node tried to deallocate the inode but failed due to this node
 485  * still having the inode open. Here we mark the link count zero
 486  * since we know that it must have reached zero if the GLF_DEMOTE flag
 487  * is set on the iopen glock. If we didn't do a disk read since the
 488  * remote node removed the final link then we might otherwise miss
 489  * this event. This check ensures that this node will deallocate the
 490  * inode's blocks, or alternatively pass the baton on to another
 491  * node for later deallocation.
 492  */
 493
 494 static void gfs2_drop_inode(struct inode *inode)
 495 {
 496         struct gfs2_inode *ip = GFS2_I(inode);
 497
 498         if (test_bit(GIF_USER, &ip->i_flags) && inode->i_nlink) {
 499                 struct gfs2_glock *gl = ip->i_iopen_gh.gh_gl;
 500                 if (gl && test_bit(GLF_DEMOTE, &gl->gl_flags))
 501                         clear_nlink(inode);
 502         }
 503         generic_drop_inode(inode);
 504 }
 505
 506 /**
 507  * gfs2_clear_inode - Deallocate an inode when VFS is done with it
 508  * @inode: The VFS inode
 509  *
 510  */
 511
 512 static void gfs2_clear_inode(struct inode *inode)
 513 {
 514         struct gfs2_inode *ip = GFS2_I(inode);
 515
 516         /* This tells us its a "real" inode and not one which only
 517          * serves to contain an address space (see rgrp.c, meta_io.c)
 518          * which therefore doesn't have its own glocks.
 519          */
 520         if (test_bit(GIF_USER, &ip->i_flags)) {
 521                 ip->i_gl->gl_object = NULL;
 522                 gfs2_glock_put(ip->i_gl);
 523                 ip->i_gl = NULL;
 524                 if (ip->i_iopen_gh.gh_gl) {
 525                         ip->i_iopen_gh.gh_gl->gl_object = NULL;
 526                         gfs2_glock_dq_uninit(&ip->i_iopen_gh);
 527                 }
 528         }
 529 }
 530
 531 static int is_ancestor(const struct dentry *d1, const struct dentry *d2)
 532 {
 533         do {
 534                 if (d1 == d2)
 535                         return 1;
 536                 d1 = d1->d_parent;
 537         } while (!IS_ROOT(d1));
 538         return 0;
 539 }
 540
 541 /**
 542  * gfs2_show_options - Show mount options for /proc/mounts
 543  * @s: seq_file structure
 544  * @mnt: vfsmount
 545  *
 546  * Returns: 0 on success or error code
 547  */
 548
 549 static int gfs2_show_options(struct seq_file *s, struct vfsmount *mnt)
 550 {
 551         struct gfs2_sbd *sdp = mnt->mnt_sb->s_fs_info;
 552         struct gfs2_args *args = &sdp->sd_args;
 553
 554         if (is_ancestor(mnt->mnt_root, sdp->sd_master_dir))
 555                 seq_printf(s, ",meta");
 556         if (args->ar_lockproto[0])
 557                 seq_printf(s, ",lockproto=%s", args->ar_lockproto);
 558         if (args->ar_locktable[0])
 559                 seq_printf(s, ",locktable=%s", args->ar_locktable);
 560         if (args->ar_hostdata[0])
 561                 seq_printf(s, ",hostdata=%s", args->ar_hostdata);
 562         if (args->ar_spectator)
 563                 seq_printf(s, ",spectator");
 564         if (args->ar_ignore_local_fs)
 565                 seq_printf(s, ",ignore_local_fs");
 566         if (args->ar_localflocks)
 567                 seq_printf(s, ",localflocks");
 568         if (args->ar_localcaching)
 569                 seq_printf(s, ",localcaching");
 570         if (args->ar_debug)
 571                 seq_printf(s, ",debug");
 572         if (args->ar_upgrade)
 573                 seq_printf(s, ",upgrade");
 574         if (args->ar_posix_acl)
 575                 seq_printf(s, ",acl");
 576         if (args->ar_quota != GFS2_QUOTA_DEFAULT) {
 577                 char *state;
 578                 switch (args->ar_quota) {
 579                 case GFS2_QUOTA_OFF:
 580                         state = "off";
 581                         break;
 582                 case GFS2_QUOTA_ACCOUNT:
 583                         state = "account";
 584                         break;
 585                 case GFS2_QUOTA_ON:
 586                         state = "on";
 587                         break;
 588                 default:
 589                         state = "unknown";
 590                         break;
 591                 }
 592                 seq_printf(s, ",quota=%s", state);
 593         }
 594         if (args->ar_suiddir)
 595                 seq_printf(s, ",suiddir");
 596         if (args->ar_data != GFS2_DATA_DEFAULT) {
 597                 char *state;
 598                 switch (args->ar_data) {
 599                 case GFS2_DATA_WRITEBACK:
 600                         state = "writeback";
 601                         break;
 602                 case GFS2_DATA_ORDERED:
 603                         state = "ordered";
 604                         break;
 605                 default:
 606                         state = "unknown";
 607                         break;
 608                 }
 609                 seq_printf(s, ",data=%s", state);
 610         }
 611         if (args->ar_discard)
 612                 seq_printf(s, ",discard");
 613
 614         return 0;
 615 }
 616
 617 /*
 618  * We have to (at the moment) hold the inodes main lock to cover
 619  * the gap between unlocking the shared lock on the iopen lock and
 620  * taking the exclusive lock. I'd rather do a shared -> exclusive
 621  * conversion on the iopen lock, but we can change that later. This
 622  * is safe, just less efficient.
 623  */
 624
 625 static void gfs2_delete_inode(struct inode *inode)
 626 {
 627         struct gfs2_sbd *sdp = inode->i_sb->s_fs_info;
 628         struct gfs2_inode *ip = GFS2_I(inode);
 629         struct gfs2_holder gh;
 630         int error;
 631
 632         if (!test_bit(GIF_USER, &ip->i_flags))
 633                 goto out;
 634
 635         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
 636         if (unlikely(error)) {
 637                 gfs2_glock_dq_uninit(&ip->i_iopen_gh);
 638                 goto out;
 639         }
 640
 641         gfs2_glock_dq_wait(&ip->i_iopen_gh);
 642         gfs2_holder_reinit(LM_ST_EXCLUSIVE, LM_FLAG_TRY_1CB | GL_NOCACHE, &ip->i_iopen_gh);
 643         error = gfs2_glock_nq(&ip->i_iopen_gh);
 644         if (error)
 645                 goto out_truncate;
 646
 647         if (S_ISDIR(inode->i_mode) &&
 648             (ip->i_diskflags & GFS2_DIF_EXHASH)) {
 649                 error = gfs2_dir_exhash_dealloc(ip);
 650                 if (error)
 651                         goto out_unlock;
 652         }
 653
 654         if (ip->i_eattr) {
 655                 error = gfs2_ea_dealloc(ip);
 656                 if (error)
 657                         goto out_unlock;
 658         }
 659
 660         if (!gfs2_is_stuffed(ip)) {
 661                 error = gfs2_file_dealloc(ip);
 662                 if (error)
 663                         goto out_unlock;
 664         }
 665
 666         error = gfs2_dinode_dealloc(ip);
 667         if (error)
 668                 goto out_unlock;
 669
 670 out_truncate:
 671         error = gfs2_trans_begin(sdp, 0, sdp->sd_jdesc->jd_blocks);
 672         if (error)
 673                 goto out_unlock;
 674         /* Needs to be done before glock release & also in a transaction */
 675         truncate_inode_pages(&inode->i_data, 0);
 676         gfs2_trans_end(sdp);
 677
 678 out_unlock:
 679         if (test_bit(HIF_HOLDER, &ip->i_iopen_gh.gh_iflags))
 680                 gfs2_glock_dq(&ip->i_iopen_gh);
 681         gfs2_holder_uninit(&ip->i_iopen_gh);
 682         gfs2_glock_dq_uninit(&gh);
 683         if (error && error != GLR_TRYFAILED)
 684                 fs_warn(sdp, "gfs2_delete_inode: %d\n", error);
 685 out:
 686         truncate_inode_pages(&inode->i_data, 0);
 687         clear_inode(inode);
 688 }
 689
 690 static struct inode *gfs2_alloc_inode(struct super_block *sb)
 691 {
 692         struct gfs2_inode *ip;
 693
 694         ip = kmem_cache_alloc(gfs2_inode_cachep, GFP_KERNEL);
 695         if (ip) {
 696                 ip->i_flags = 0;
 697                 ip->i_gl = NULL;
 698         }
 699         return &ip->i_inode;
 700 }
 701
 702 static void gfs2_destroy_inode(struct inode *inode)
 703 {
 704         kmem_cache_free(gfs2_inode_cachep, inode);
 705 }
 706
 707 const struct super_operations gfs2_super_ops = {
 708         .alloc_inode            = gfs2_alloc_inode,
 709         .destroy_inode          = gfs2_destroy_inode,
 710         .write_inode            = gfs2_write_inode,
 711         .delete_inode           = gfs2_delete_inode,
 712         .put_super              = gfs2_put_super,
 713         .write_super            = gfs2_write_super,
 714         .sync_fs                = gfs2_sync_fs,
 715         .freeze_fs              = gfs2_freeze,
 716         .unfreeze_fs            = gfs2_unfreeze,
 717         .statfs                 = gfs2_statfs,
 718         .remount_fs             = gfs2_remount_fs,
 719         .clear_inode            = gfs2_clear_inode,
 720         .drop_inode             = gfs2_drop_inode,
 721         .show_options           = gfs2_show_options,
 722 };
 723