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_statfs_quantum,
  74         Opt_statfs_percent,
  75         Opt_quota_quantum,
  76         Opt_error,
  77 };
  78
  79 static const match_table_t tokens = {
  80         {Opt_lockproto, "lockproto=%s"},
  81         {Opt_locktable, "locktable=%s"},
  82         {Opt_hostdata, "hostdata=%s"},
  83         {Opt_spectator, "spectator"},
  84         {Opt_ignore_local_fs, "ignore_local_fs"},
  85         {Opt_localflocks, "localflocks"},
  86         {Opt_localcaching, "localcaching"},
  87         {Opt_debug, "debug"},
  88         {Opt_nodebug, "nodebug"},
  89         {Opt_upgrade, "upgrade"},
  90         {Opt_acl, "acl"},
  91         {Opt_noacl, "noacl"},
  92         {Opt_quota_off, "quota=off"},
  93         {Opt_quota_account, "quota=account"},
  94         {Opt_quota_on, "quota=on"},
  95         {Opt_quota, "quota"},
  96         {Opt_noquota, "noquota"},
  97         {Opt_suiddir, "suiddir"},
  98         {Opt_nosuiddir, "nosuiddir"},
  99         {Opt_data_writeback, "data=writeback"},
 100         {Opt_data_ordered, "data=ordered"},
 101         {Opt_meta, "meta"},
 102         {Opt_discard, "discard"},
 103         {Opt_nodiscard, "nodiscard"},
 104         {Opt_commit, "commit=%d"},
 105         {Opt_err_withdraw, "errors=withdraw"},
 106         {Opt_err_panic, "errors=panic"},
 107         {Opt_statfs_quantum, "statfs_quantum=%d"},
 108         {Opt_statfs_percent, "statfs_percent=%d"},
 109         {Opt_quota_quantum, "quota_quantum=%d"},
 110         {Opt_error, NULL}
 111 };
 112
 113 /**
 114  * gfs2_mount_args - Parse mount options
 115  * @args: The structure into which the parsed options will be written
 116  * @options: The options to parse
 117  *
 118  * Return: errno
 119  */
 120
 121 int gfs2_mount_args(struct gfs2_args *args, char *options)
 122 {
 123         char *o;
 124         int token;
 125         substring_t tmp[MAX_OPT_ARGS];
 126         int rv;
 127
 128         /* Split the options into tokens with the "," character and
 129            process them */
 130
 131         while (1) {
 132                 o = strsep(&options, ",");
 133                 if (o == NULL)
 134                         break;
 135                 if (*o == '\0')
 136                         continue;
 137
 138                 token = match_token(o, tokens, tmp);
 139                 switch (token) {
 140                 case Opt_lockproto:
 141                         match_strlcpy(args->ar_lockproto, &tmp[0],
 142                                       GFS2_LOCKNAME_LEN);
 143                         break;
 144                 case Opt_locktable:
 145                         match_strlcpy(args->ar_locktable, &tmp[0],
 146                                       GFS2_LOCKNAME_LEN);
 147                         break;
 148                 case Opt_hostdata:
 149                         match_strlcpy(args->ar_hostdata, &tmp[0],
 150                                       GFS2_LOCKNAME_LEN);
 151                         break;
 152                 case Opt_spectator:
 153                         args->ar_spectator = 1;
 154                         break;
 155                 case Opt_ignore_local_fs:
 156                         args->ar_ignore_local_fs = 1;
 157                         break;
 158                 case Opt_localflocks:
 159                         args->ar_localflocks = 1;
 160                         break;
 161                 case Opt_localcaching:
 162                         args->ar_localcaching = 1;
 163                         break;
 164                 case Opt_debug:
 165                         if (args->ar_errors == GFS2_ERRORS_PANIC) {
 166                                 printk(KERN_WARNING "GFS2: -o debug and -o errors=panic "
 167                                        "are mutually exclusive.\n");
 168                                 return -EINVAL;
 169                         }
 170                         args->ar_debug = 1;
 171                         break;
 172                 case Opt_nodebug:
 173                         args->ar_debug = 0;
 174                         break;
 175                 case Opt_upgrade:
 176                         args->ar_upgrade = 1;
 177                         break;
 178                 case Opt_acl:
 179                         args->ar_posix_acl = 1;
 180                         break;
 181                 case Opt_noacl:
 182                         args->ar_posix_acl = 0;
 183                         break;
 184                 case Opt_quota_off:
 185                 case Opt_noquota:
 186                         args->ar_quota = GFS2_QUOTA_OFF;
 187                         break;
 188                 case Opt_quota_account:
 189                         args->ar_quota = GFS2_QUOTA_ACCOUNT;
 190                         break;
 191                 case Opt_quota_on:
 192                 case Opt_quota:
 193                         args->ar_quota = GFS2_QUOTA_ON;
 194                         break;
 195                 case Opt_suiddir:
 196                         args->ar_suiddir = 1;
 197                         break;
 198                 case Opt_nosuiddir:
 199                         args->ar_suiddir = 0;
 200                         break;
 201                 case Opt_data_writeback:
 202                         args->ar_data = GFS2_DATA_WRITEBACK;
 203                         break;
 204                 case Opt_data_ordered:
 205                         args->ar_data = GFS2_DATA_ORDERED;
 206                         break;
 207                 case Opt_meta:
 208                         args->ar_meta = 1;
 209                         break;
 210                 case Opt_discard:
 211                         args->ar_discard = 1;
 212                         break;
 213                 case Opt_nodiscard:
 214                         args->ar_discard = 0;
 215                         break;
 216                 case Opt_commit:
 217                         rv = match_int(&tmp[0], &args->ar_commit);
 218                         if (rv || args->ar_commit <= 0) {
 219                                 printk(KERN_WARNING "GFS2: commit mount option requires a positive numeric argument\n");
 220                                 return rv ? rv : -EINVAL;
 221                         }
 222                         break;
 223                 case Opt_statfs_quantum:
 224                         rv = match_int(&tmp[0], &args->ar_statfs_quantum);
 225                         if (rv || args->ar_statfs_quantum < 0) {
 226                                 printk(KERN_WARNING "GFS2: statfs_quantum mount option requires a non-negative numeric argument\n");
 227                                 return rv ? rv : -EINVAL;
 228                         }
 229                         break;
 230                 case Opt_quota_quantum:
 231                         rv = match_int(&tmp[0], &args->ar_quota_quantum);
 232                         if (rv || args->ar_quota_quantum <= 0) {
 233                                 printk(KERN_WARNING "GFS2: quota_quantum mount option requires a positive numeric argument\n");
 234                                 return rv ? rv : -EINVAL;
 235                         }
 236                         break;
 237                 case Opt_statfs_percent:
 238                         rv = match_int(&tmp[0], &args->ar_statfs_percent);
 239                         if (rv || args->ar_statfs_percent < 0 ||
 240                             args->ar_statfs_percent > 100) {
 241                                 printk(KERN_WARNING "statfs_percent mount option requires a numeric argument between 0 and 100\n");
 242                                 return rv ? rv : -EINVAL;
 243                         }
 244                         break;
 245                 case Opt_err_withdraw:
 246                         args->ar_errors = GFS2_ERRORS_WITHDRAW;
 247                         break;
 248                 case Opt_err_panic:
 249                         if (args->ar_debug) {
 250                                 printk(KERN_WARNING "GFS2: -o debug and -o errors=panic "
 251                                         "are mutually exclusive.\n");
 252                                 return -EINVAL;
 253                         }
 254                         args->ar_errors = GFS2_ERRORS_PANIC;
 255                         break;
 256                 case Opt_error:
 257                 default:
 258                         printk(KERN_WARNING "GFS2: invalid mount option: %s\n", o);
 259                         return -EINVAL;
 260                 }
 261         }
 262
 263         return 0;
 264 }
 265
 266 /**
 267  * gfs2_jindex_free - Clear all the journal index information
 268  * @sdp: The GFS2 superblock
 269  *
 270  */
 271
 272 void gfs2_jindex_free(struct gfs2_sbd *sdp)
 273 {
 274         struct list_head list, *head;
 275         struct gfs2_jdesc *jd;
 276         struct gfs2_journal_extent *jext;
 277
 278         spin_lock(&sdp->sd_jindex_spin);
 279         list_add(&list, &sdp->sd_jindex_list);
 280         list_del_init(&sdp->sd_jindex_list);
 281         sdp->sd_journals = 0;
 282         spin_unlock(&sdp->sd_jindex_spin);
 283
 284         while (!list_empty(&list)) {
 285                 jd = list_entry(list.next, struct gfs2_jdesc, jd_list);
 286                 head = &jd->extent_list;
 287                 while (!list_empty(head)) {
 288                         jext = list_entry(head->next,
 289                                           struct gfs2_journal_extent,
 290                                           extent_list);
 291                         list_del(&jext->extent_list);
 292                         kfree(jext);
 293                 }
 294                 list_del(&jd->jd_list);
 295                 iput(jd->jd_inode);
 296                 kfree(jd);
 297         }
 298 }
 299
 300 static struct gfs2_jdesc *jdesc_find_i(struct list_head *head, unsigned int jid)
 301 {
 302         struct gfs2_jdesc *jd;
 303         int found = 0;
 304
 305         list_for_each_entry(jd, head, jd_list) {
 306                 if (jd->jd_jid == jid) {
 307                         found = 1;
 308                         break;
 309                 }
 310         }
 311
 312         if (!found)
 313                 jd = NULL;
 314
 315         return jd;
 316 }
 317
 318 struct gfs2_jdesc *gfs2_jdesc_find(struct gfs2_sbd *sdp, unsigned int jid)
 319 {
 320         struct gfs2_jdesc *jd;
 321
 322         spin_lock(&sdp->sd_jindex_spin);
 323         jd = jdesc_find_i(&sdp->sd_jindex_list, jid);
 324         spin_unlock(&sdp->sd_jindex_spin);
 325
 326         return jd;
 327 }
 328
 329 int gfs2_jdesc_check(struct gfs2_jdesc *jd)
 330 {
 331         struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
 332         struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
 333         int ar;
 334         int error;
 335
 336         if (ip->i_disksize < (8 << 20) || ip->i_disksize > (1 << 30) ||
 337             (ip->i_disksize & (sdp->sd_sb.sb_bsize - 1))) {
 338                 gfs2_consist_inode(ip);
 339                 return -EIO;
 340         }
 341         jd->jd_blocks = ip->i_disksize >> sdp->sd_sb.sb_bsize_shift;
 342
 343         error = gfs2_write_alloc_required(ip, 0, ip->i_disksize, &ar);
 344         if (!error && ar) {
 345                 gfs2_consist_inode(ip);
 346                 error = -EIO;
 347         }
 348
 349         return error;
 350 }
 351
 352 /**
 353  * gfs2_make_fs_rw - Turn a Read-Only FS into a Read-Write one
 354  * @sdp: the filesystem
 355  *
 356  * Returns: errno
 357  */
 358
 359 int gfs2_make_fs_rw(struct gfs2_sbd *sdp)
 360 {
 361         struct gfs2_inode *ip = GFS2_I(sdp->sd_jdesc->jd_inode);
 362         struct gfs2_glock *j_gl = ip->i_gl;
 363         struct gfs2_holder t_gh;
 364         struct gfs2_log_header_host head;
 365         int error;
 366
 367         error = gfs2_glock_nq_init(sdp->sd_trans_gl, LM_ST_SHARED, 0, &t_gh);
 368         if (error)
 369                 return error;
 370
 371         j_gl->gl_ops->go_inval(j_gl, DIO_METADATA);
 372
 373         error = gfs2_find_jhead(sdp->sd_jdesc, &head);
 374         if (error)
 375                 goto fail;
 376
 377         if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) {
 378                 gfs2_consist(sdp);
 379                 error = -EIO;
 380                 goto fail;
 381         }
 382
 383         /*  Initialize some head of the log stuff  */
 384         sdp->sd_log_sequence = head.lh_sequence + 1;
 385         gfs2_log_pointers_init(sdp, head.lh_blkno);
 386
 387         error = gfs2_quota_init(sdp);
 388         if (error)
 389                 goto fail;
 390
 391         set_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags);
 392
 393         gfs2_glock_dq_uninit(&t_gh);
 394
 395         return 0;
 396
 397 fail:
 398         t_gh.gh_flags |= GL_NOCACHE;
 399         gfs2_glock_dq_uninit(&t_gh);
 400
 401         return error;
 402 }
 403
 404 void gfs2_statfs_change_in(struct gfs2_statfs_change_host *sc, const void *buf)
 405 {
 406         const struct gfs2_statfs_change *str = buf;
 407
 408         sc->sc_total = be64_to_cpu(str->sc_total);
 409         sc->sc_free = be64_to_cpu(str->sc_free);
 410         sc->sc_dinodes = be64_to_cpu(str->sc_dinodes);
 411 }
 412
 413 static void gfs2_statfs_change_out(const struct gfs2_statfs_change_host *sc, void *buf)
 414 {
 415         struct gfs2_statfs_change *str = buf;
 416
 417         str->sc_total = cpu_to_be64(sc->sc_total);
 418         str->sc_free = cpu_to_be64(sc->sc_free);
 419         str->sc_dinodes = cpu_to_be64(sc->sc_dinodes);
 420 }
 421
 422 int gfs2_statfs_init(struct gfs2_sbd *sdp)
 423 {
 424         struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
 425         struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
 426         struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
 427         struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
 428         struct buffer_head *m_bh, *l_bh;
 429         struct gfs2_holder gh;
 430         int error;
 431
 432         error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE,
 433                                    &gh);
 434         if (error)
 435                 return error;
 436
 437         error = gfs2_meta_inode_buffer(m_ip, &m_bh);
 438         if (error)
 439                 goto out;
 440
 441         if (sdp->sd_args.ar_spectator) {
 442                 spin_lock(&sdp->sd_statfs_spin);
 443                 gfs2_statfs_change_in(m_sc, m_bh->b_data +
 444                                       sizeof(struct gfs2_dinode));
 445                 spin_unlock(&sdp->sd_statfs_spin);
 446         } else {
 447                 error = gfs2_meta_inode_buffer(l_ip, &l_bh);
 448                 if (error)
 449                         goto out_m_bh;
 450
 451                 spin_lock(&sdp->sd_statfs_spin);
 452                 gfs2_statfs_change_in(m_sc, m_bh->b_data +
 453                                       sizeof(struct gfs2_dinode));
 454                 gfs2_statfs_change_in(l_sc, l_bh->b_data +
 455                                       sizeof(struct gfs2_dinode));
 456                 spin_unlock(&sdp->sd_statfs_spin);
 457
 458                 brelse(l_bh);
 459         }
 460
 461 out_m_bh:
 462         brelse(m_bh);
 463 out:
 464         gfs2_glock_dq_uninit(&gh);
 465         return 0;
 466 }
 467
 468 void gfs2_statfs_change(struct gfs2_sbd *sdp, s64 total, s64 free,
 469                         s64 dinodes)
 470 {
 471         struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
 472         struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
 473         struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
 474         struct buffer_head *l_bh;
 475         s64 x, y;
 476         int need_sync = 0;
 477         int error;
 478
 479         error = gfs2_meta_inode_buffer(l_ip, &l_bh);
 480         if (error)
 481                 return;
 482
 483         gfs2_trans_add_bh(l_ip->i_gl, l_bh, 1);
 484
 485         spin_lock(&sdp->sd_statfs_spin);
 486         l_sc->sc_total += total;
 487         l_sc->sc_free += free;
 488         l_sc->sc_dinodes += dinodes;
 489         gfs2_statfs_change_out(l_sc, l_bh->b_data + sizeof(struct gfs2_dinode));
 490         if (sdp->sd_args.ar_statfs_percent) {
 491                 x = 100 * l_sc->sc_free;
 492                 y = m_sc->sc_free * sdp->sd_args.ar_statfs_percent;
 493                 if (x >= y || x <= -y)
 494                         need_sync = 1;
 495         }
 496         spin_unlock(&sdp->sd_statfs_spin);
 497
 498         brelse(l_bh);
 499         if (need_sync)
 500                 gfs2_wake_up_statfs(sdp);
 501 }
 502
 503 void update_statfs(struct gfs2_sbd *sdp, struct buffer_head *m_bh,
 504                    struct buffer_head *l_bh)
 505 {
 506         struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
 507         struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
 508         struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
 509         struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
 510
 511         gfs2_trans_add_bh(l_ip->i_gl, l_bh, 1);
 512
 513         spin_lock(&sdp->sd_statfs_spin);
 514         m_sc->sc_total += l_sc->sc_total;
 515         m_sc->sc_free += l_sc->sc_free;
 516         m_sc->sc_dinodes += l_sc->sc_dinodes;
 517         memset(l_sc, 0, sizeof(struct gfs2_statfs_change));
 518         memset(l_bh->b_data + sizeof(struct gfs2_dinode),
 519                0, sizeof(struct gfs2_statfs_change));
 520         spin_unlock(&sdp->sd_statfs_spin);
 521
 522         gfs2_trans_add_bh(m_ip->i_gl, m_bh, 1);
 523         gfs2_statfs_change_out(m_sc, m_bh->b_data + sizeof(struct gfs2_dinode));
 524 }
 525
 526 int gfs2_statfs_sync(struct super_block *sb, int type)
 527 {
 528         struct gfs2_sbd *sdp = sb->s_fs_info;
 529         struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
 530         struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
 531         struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
 532         struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
 533         struct gfs2_holder gh;
 534         struct buffer_head *m_bh, *l_bh;
 535         int error;
 536
 537         error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE,
 538                                    &gh);
 539         if (error)
 540                 return error;
 541
 542         error = gfs2_meta_inode_buffer(m_ip, &m_bh);
 543         if (error)
 544                 goto out;
 545
 546         spin_lock(&sdp->sd_statfs_spin);
 547         gfs2_statfs_change_in(m_sc, m_bh->b_data +
 548                               sizeof(struct gfs2_dinode));
 549         if (!l_sc->sc_total && !l_sc->sc_free && !l_sc->sc_dinodes) {
 550                 spin_unlock(&sdp->sd_statfs_spin);
 551                 goto out_bh;
 552         }
 553         spin_unlock(&sdp->sd_statfs_spin);
 554
 555         error = gfs2_meta_inode_buffer(l_ip, &l_bh);
 556         if (error)
 557                 goto out_bh;
 558
 559         error = gfs2_trans_begin(sdp, 2 * RES_DINODE, 0);
 560         if (error)
 561                 goto out_bh2;
 562
 563         update_statfs(sdp, m_bh, l_bh);
 564         sdp->sd_statfs_force_sync = 0;
 565
 566         gfs2_trans_end(sdp);
 567
 568 out_bh2:
 569         brelse(l_bh);
 570 out_bh:
 571         brelse(m_bh);
 572 out:
 573         gfs2_glock_dq_uninit(&gh);
 574         return error;
 575 }
 576
 577 struct lfcc {
 578         struct list_head list;
 579         struct gfs2_holder gh;
 580 };
 581
 582 /**
 583  * gfs2_lock_fs_check_clean - Stop all writes to the FS and check that all
 584  *                            journals are clean
 585  * @sdp: the file system
 586  * @state: the state to put the transaction lock into
 587  * @t_gh: the hold on the transaction lock
 588  *
 589  * Returns: errno
 590  */
 591
 592 static int gfs2_lock_fs_check_clean(struct gfs2_sbd *sdp,
 593                                     struct gfs2_holder *t_gh)
 594 {
 595         struct gfs2_inode *ip;
 596         struct gfs2_jdesc *jd;
 597         struct lfcc *lfcc;
 598         LIST_HEAD(list);
 599         struct gfs2_log_header_host lh;
 600         int error;
 601
 602         list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
 603                 lfcc = kmalloc(sizeof(struct lfcc), GFP_KERNEL);
 604                 if (!lfcc) {
 605                         error = -ENOMEM;
 606                         goto out;
 607                 }
 608                 ip = GFS2_I(jd->jd_inode);
 609                 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &lfcc->gh);
 610                 if (error) {
 611                         kfree(lfcc);
 612                         goto out;
 613                 }
 614                 list_add(&lfcc->list, &list);
 615         }
 616
 617         error = gfs2_glock_nq_init(sdp->sd_trans_gl, LM_ST_DEFERRED,
 618                                    GL_NOCACHE, t_gh);
 619
 620         list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
 621                 error = gfs2_jdesc_check(jd);
 622                 if (error)
 623                         break;
 624                 error = gfs2_find_jhead(jd, &lh);
 625                 if (error)
 626                         break;
 627                 if (!(lh.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) {
 628                         error = -EBUSY;
 629                         break;
 630                 }
 631         }
 632
 633         if (error)
 634                 gfs2_glock_dq_uninit(t_gh);
 635
 636 out:
 637         while (!list_empty(&list)) {
 638                 lfcc = list_entry(list.next, struct lfcc, list);
 639                 list_del(&lfcc->list);
 640                 gfs2_glock_dq_uninit(&lfcc->gh);
 641                 kfree(lfcc);
 642         }
 643         return error;
 644 }
 645
 646 /**
 647  * gfs2_freeze_fs - freezes the file system
 648  * @sdp: the file system
 649  *
 650  * This function flushes data and meta data for all machines by
 651  * aquiring the transaction log exclusively.  All journals are
 652  * ensured to be in a clean state as well.
 653  *
 654  * Returns: errno
 655  */
 656
 657 int gfs2_freeze_fs(struct gfs2_sbd *sdp)
 658 {
 659         int error = 0;
 660
 661         mutex_lock(&sdp->sd_freeze_lock);
 662
 663         if (!sdp->sd_freeze_count++) {
 664                 error = gfs2_lock_fs_check_clean(sdp, &sdp->sd_freeze_gh);
 665                 if (error)
 666                         sdp->sd_freeze_count--;
 667         }
 668
 669         mutex_unlock(&sdp->sd_freeze_lock);
 670
 671         return error;
 672 }
 673
 674 /**
 675  * gfs2_unfreeze_fs - unfreezes the file system
 676  * @sdp: the file system
 677  *
 678  * This function allows the file system to proceed by unlocking
 679  * the exclusively held transaction lock.  Other GFS2 nodes are
 680  * now free to acquire the lock shared and go on with their lives.
 681  *
 682  */
 683
 684 void gfs2_unfreeze_fs(struct gfs2_sbd *sdp)
 685 {
 686         mutex_lock(&sdp->sd_freeze_lock);
 687
 688         if (sdp->sd_freeze_count && !--sdp->sd_freeze_count)
 689                 gfs2_glock_dq_uninit(&sdp->sd_freeze_gh);
 690
 691         mutex_unlock(&sdp->sd_freeze_lock);
 692 }
 693
 694
 695 /**
 696  * gfs2_write_inode - Make sure the inode is stable on the disk
 697  * @inode: The inode
 698  * @sync: synchronous write flag
 699  *
 700  * Returns: errno
 701  */
 702
 703 static int gfs2_write_inode(struct inode *inode, int sync)
 704 {
 705         struct gfs2_inode *ip = GFS2_I(inode);
 706         struct gfs2_sbd *sdp = GFS2_SB(inode);
 707         struct gfs2_holder gh;
 708         struct buffer_head *bh;
 709         struct timespec atime;
 710         struct gfs2_dinode *di;
 711         int ret = 0;
 712
 713         /* Check this is a "normal" inode, etc */
 714         if (!test_bit(GIF_USER, &ip->i_flags) ||
 715             (current->flags & PF_MEMALLOC))
 716                 return 0;
 717         ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
 718         if (ret)
 719                 goto do_flush;
 720         ret = gfs2_trans_begin(sdp, RES_DINODE, 0);
 721         if (ret)
 722                 goto do_unlock;
 723         ret = gfs2_meta_inode_buffer(ip, &bh);
 724         if (ret == 0) {
 725                 di = (struct gfs2_dinode *)bh->b_data;
 726                 atime.tv_sec = be64_to_cpu(di->di_atime);
 727                 atime.tv_nsec = be32_to_cpu(di->di_atime_nsec);
 728                 if (timespec_compare(&inode->i_atime, &atime) > 0) {
 729                         gfs2_trans_add_bh(ip->i_gl, bh, 1);
 730                         gfs2_dinode_out(ip, bh->b_data);
 731                 }
 732                 brelse(bh);
 733         }
 734         gfs2_trans_end(sdp);
 735 do_unlock:
 736         gfs2_glock_dq_uninit(&gh);
 737 do_flush:
 738         if (sync != 0)
 739                 gfs2_log_flush(GFS2_SB(inode), ip->i_gl);
 740         return ret;
 741 }
 742
 743 /**
 744  * gfs2_make_fs_ro - Turn a Read-Write FS into a Read-Only one
 745  * @sdp: the filesystem
 746  *
 747  * Returns: errno
 748  */
 749
 750 static int gfs2_make_fs_ro(struct gfs2_sbd *sdp)
 751 {
 752         struct gfs2_holder t_gh;
 753         int error;
 754
 755         flush_workqueue(gfs2_delete_workqueue);
 756         gfs2_quota_sync(sdp->sd_vfs, 0);
 757         gfs2_statfs_sync(sdp->sd_vfs, 0);
 758
 759         error = gfs2_glock_nq_init(sdp->sd_trans_gl, LM_ST_SHARED, GL_NOCACHE,
 760                                    &t_gh);
 761         if (error && !test_bit(SDF_SHUTDOWN, &sdp->sd_flags))
 762                 return error;
 763
 764         gfs2_meta_syncfs(sdp);
 765         gfs2_log_shutdown(sdp);
 766
 767         clear_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags);
 768
 769         if (t_gh.gh_gl)
 770                 gfs2_glock_dq_uninit(&t_gh);
 771
 772         gfs2_quota_cleanup(sdp);
 773
 774         return error;
 775 }
 776
 777 static int gfs2_umount_recovery_wait(void *word)
 778 {
 779         schedule();
 780         return 0;
 781 }
 782
 783 /**
 784  * gfs2_put_super - Unmount the filesystem
 785  * @sb: The VFS superblock
 786  *
 787  */
 788
 789 static void gfs2_put_super(struct super_block *sb)
 790 {
 791         struct gfs2_sbd *sdp = sb->s_fs_info;
 792         int error;
 793         struct gfs2_jdesc *jd;
 794
 795         /*  Unfreeze the filesystem, if we need to  */
 796
 797         mutex_lock(&sdp->sd_freeze_lock);
 798         if (sdp->sd_freeze_count)
 799                 gfs2_glock_dq_uninit(&sdp->sd_freeze_gh);
 800         mutex_unlock(&sdp->sd_freeze_lock);
 801
 802         /* No more recovery requests */
 803         set_bit(SDF_NORECOVERY, &sdp->sd_flags);
 804         smp_mb();
 805
 806         /* Wait on outstanding recovery */
 807 restart:
 808         spin_lock(&sdp->sd_jindex_spin);
 809         list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
 810                 if (!test_bit(JDF_RECOVERY, &jd->jd_flags))
 811                         continue;
 812                 spin_unlock(&sdp->sd_jindex_spin);
 813                 wait_on_bit(&jd->jd_flags, JDF_RECOVERY,
 814                             gfs2_umount_recovery_wait, TASK_UNINTERRUPTIBLE);
 815                 goto restart;
 816         }
 817         spin_unlock(&sdp->sd_jindex_spin);
 818
 819         kthread_stop(sdp->sd_quotad_process);
 820         kthread_stop(sdp->sd_logd_process);
 821
 822         if (!(sb->s_flags & MS_RDONLY)) {
 823                 error = gfs2_make_fs_ro(sdp);
 824                 if (error)
 825                         gfs2_io_error(sdp);
 826         }
 827         /*  At this point, we're through modifying the disk  */
 828
 829         /*  Release stuff  */
 830
 831         iput(sdp->sd_jindex);
 832         iput(sdp->sd_statfs_inode);
 833         iput(sdp->sd_rindex);
 834         iput(sdp->sd_quota_inode);
 835
 836         gfs2_glock_put(sdp->sd_rename_gl);
 837         gfs2_glock_put(sdp->sd_trans_gl);
 838
 839         if (!sdp->sd_args.ar_spectator) {
 840                 gfs2_glock_dq_uninit(&sdp->sd_journal_gh);
 841                 gfs2_glock_dq_uninit(&sdp->sd_jinode_gh);
 842                 gfs2_glock_dq_uninit(&sdp->sd_sc_gh);
 843                 gfs2_glock_dq_uninit(&sdp->sd_qc_gh);
 844                 iput(sdp->sd_sc_inode);
 845                 iput(sdp->sd_qc_inode);
 846         }
 847
 848         gfs2_glock_dq_uninit(&sdp->sd_live_gh);
 849         gfs2_clear_rgrpd(sdp);
 850         gfs2_jindex_free(sdp);
 851         /*  Take apart glock structures and buffer lists  */
 852         gfs2_gl_hash_clear(sdp);
 853         /*  Unmount the locking protocol  */
 854         gfs2_lm_unmount(sdp);
 855
 856         /*  At this point, we're through participating in the lockspace  */
 857         gfs2_sys_fs_del(sdp);
 858 }
 859
 860 /**
 861  * gfs2_sync_fs - sync the filesystem
 862  * @sb: the superblock
 863  *
 864  * Flushes the log to disk.
 865  */
 866
 867 static int gfs2_sync_fs(struct super_block *sb, int wait)
 868 {
 869         if (wait && sb->s_fs_info)
 870                 gfs2_log_flush(sb->s_fs_info, NULL);
 871         return 0;
 872 }
 873
 874 /**
 875  * gfs2_freeze - prevent further writes to the filesystem
 876  * @sb: the VFS structure for the filesystem
 877  *
 878  */
 879
 880 static int gfs2_freeze(struct super_block *sb)
 881 {
 882         struct gfs2_sbd *sdp = sb->s_fs_info;
 883         int error;
 884
 885         if (test_bit(SDF_SHUTDOWN, &sdp->sd_flags))
 886                 return -EINVAL;
 887
 888         for (;;) {
 889                 error = gfs2_freeze_fs(sdp);
 890                 if (!error)
 891                         break;
 892
 893                 switch (error) {
 894                 case -EBUSY:
 895                         fs_err(sdp, "waiting for recovery before freeze\n");
 896                         break;
 897
 898                 default:
 899                         fs_err(sdp, "error freezing FS: %d\n", error);
 900                         break;
 901                 }
 902
 903                 fs_err(sdp, "retrying...\n");
 904                 msleep(1000);
 905         }
 906         return 0;
 907 }
 908
 909 /**
 910  * gfs2_unfreeze - reallow writes to the filesystem
 911  * @sb: the VFS structure for the filesystem
 912  *
 913  */
 914
 915 static int gfs2_unfreeze(struct super_block *sb)
 916 {
 917         gfs2_unfreeze_fs(sb->s_fs_info);
 918         return 0;
 919 }
 920
 921 /**
 922  * statfs_fill - fill in the sg for a given RG
 923  * @rgd: the RG
 924  * @sc: the sc structure
 925  *
 926  * Returns: 0 on success, -ESTALE if the LVB is invalid
 927  */
 928
 929 static int statfs_slow_fill(struct gfs2_rgrpd *rgd,
 930                             struct gfs2_statfs_change_host *sc)
 931 {
 932         gfs2_rgrp_verify(rgd);
 933         sc->sc_total += rgd->rd_data;
 934         sc->sc_free += rgd->rd_free;
 935         sc->sc_dinodes += rgd->rd_dinodes;
 936         return 0;
 937 }
 938
 939 /**
 940  * gfs2_statfs_slow - Stat a filesystem using asynchronous locking
 941  * @sdp: the filesystem
 942  * @sc: the sc info that will be returned
 943  *
 944  * Any error (other than a signal) will cause this routine to fall back
 945  * to the synchronous version.
 946  *
 947  * FIXME: This really shouldn't busy wait like this.
 948  *
 949  * Returns: errno
 950  */
 951
 952 static int gfs2_statfs_slow(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *sc)
 953 {
 954         struct gfs2_holder ri_gh;
 955         struct gfs2_rgrpd *rgd_next;
 956         struct gfs2_holder *gha, *gh;
 957         unsigned int slots = 64;
 958         unsigned int x;
 959         int done;
 960         int error = 0, err;
 961
 962         memset(sc, 0, sizeof(struct gfs2_statfs_change_host));
 963         gha = kcalloc(slots, sizeof(struct gfs2_holder), GFP_KERNEL);
 964         if (!gha)
 965                 return -ENOMEM;
 966
 967         error = gfs2_rindex_hold(sdp, &ri_gh);
 968         if (error)
 969                 goto out;
 970
 971         rgd_next = gfs2_rgrpd_get_first(sdp);
 972
 973         for (;;) {
 974                 done = 1;
 975
 976                 for (x = 0; x < slots; x++) {
 977                         gh = gha + x;
 978
 979                         if (gh->gh_gl && gfs2_glock_poll(gh)) {
 980                                 err = gfs2_glock_wait(gh);
 981                                 if (err) {
 982                                         gfs2_holder_uninit(gh);
 983                                         error = err;
 984                                 } else {
 985                                         if (!error)
 986                                                 error = statfs_slow_fill(
 987                                                         gh->gh_gl->gl_object, sc);
 988                                         gfs2_glock_dq_uninit(gh);
 989                                 }
 990                         }
 991
 992                         if (gh->gh_gl)
 993                                 done = 0;
 994                         else if (rgd_next && !error) {
 995                                 error = gfs2_glock_nq_init(rgd_next->rd_gl,
 996                                                            LM_ST_SHARED,
 997                                                            GL_ASYNC,
 998                                                            gh);
 999                                 rgd_next = gfs2_rgrpd_get_next(rgd_next);
1000                                 done = 0;
1001                         }
1002
1003                         if (signal_pending(current))
1004                                 error = -ERESTARTSYS;
1005                 }
1006
1007                 if (done)
1008                         break;
1009
1010                 yield();
1011         }
1012
1013         gfs2_glock_dq_uninit(&ri_gh);
1014
1015 out:
1016         kfree(gha);
1017         return error;
1018 }
1019
1020 /**
1021  * gfs2_statfs_i - Do a statfs
1022  * @sdp: the filesystem
1023  * @sg: the sg structure
1024  *
1025  * Returns: errno
1026  */
1027
1028 static int gfs2_statfs_i(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *sc)
1029 {
1030         struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
1031         struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
1032
1033         spin_lock(&sdp->sd_statfs_spin);
1034
1035         *sc = *m_sc;
1036         sc->sc_total += l_sc->sc_total;
1037         sc->sc_free += l_sc->sc_free;
1038         sc->sc_dinodes += l_sc->sc_dinodes;
1039
1040         spin_unlock(&sdp->sd_statfs_spin);
1041
1042         if (sc->sc_free < 0)
1043                 sc->sc_free = 0;
1044         if (sc->sc_free > sc->sc_total)
1045                 sc->sc_free = sc->sc_total;
1046         if (sc->sc_dinodes < 0)
1047                 sc->sc_dinodes = 0;
1048
1049         return 0;
1050 }
1051
1052 /**
1053  * gfs2_statfs - Gather and return stats about the filesystem
1054  * @sb: The superblock
1055  * @statfsbuf: The buffer
1056  *
1057  * Returns: 0 on success or error code
1058  */
1059
1060 static int gfs2_statfs(struct dentry *dentry, struct kstatfs *buf)
1061 {
1062         struct super_block *sb = dentry->d_inode->i_sb;
1063         struct gfs2_sbd *sdp = sb->s_fs_info;
1064         struct gfs2_statfs_change_host sc;
1065         int error;
1066
1067         if (gfs2_tune_get(sdp, gt_statfs_slow))
1068                 error = gfs2_statfs_slow(sdp, &sc);
1069         else
1070                 error = gfs2_statfs_i(sdp, &sc);
1071
1072         if (error)
1073                 return error;
1074
1075         buf->f_type = GFS2_MAGIC;
1076         buf->f_bsize = sdp->sd_sb.sb_bsize;
1077         buf->f_blocks = sc.sc_total;
1078         buf->f_bfree = sc.sc_free;
1079         buf->f_bavail = sc.sc_free;
1080         buf->f_files = sc.sc_dinodes + sc.sc_free;
1081         buf->f_ffree = sc.sc_free;
1082         buf->f_namelen = GFS2_FNAMESIZE;
1083
1084         return 0;
1085 }
1086
1087 /**
1088  * gfs2_remount_fs - called when the FS is remounted
1089  * @sb:  the filesystem
1090  * @flags:  the remount flags
1091  * @data:  extra data passed in (not used right now)
1092  *
1093  * Returns: errno
1094  */
1095
1096 static int gfs2_remount_fs(struct super_block *sb, int *flags, char *data)
1097 {
1098         struct gfs2_sbd *sdp = sb->s_fs_info;
1099         struct gfs2_args args = sdp->sd_args; /* Default to current settings */
1100         struct gfs2_tune *gt = &sdp->sd_tune;
1101         int error;
1102
1103         spin_lock(&gt->gt_spin);
1104         args.ar_commit = gt->gt_log_flush_secs;
1105         args.ar_quota_quantum = gt->gt_quota_quantum;
1106         if (gt->gt_statfs_slow)
1107                 args.ar_statfs_quantum = 0;
1108         else
1109                 args.ar_statfs_quantum = gt->gt_statfs_quantum;
1110         spin_unlock(&gt->gt_spin);
1111         error = gfs2_mount_args(&args, data);
1112         if (error)
1113                 return error;
1114
1115         /* Not allowed to change locking details */
1116         if (strcmp(args.ar_lockproto, sdp->sd_args.ar_lockproto) ||
1117             strcmp(args.ar_locktable, sdp->sd_args.ar_locktable) ||
1118             strcmp(args.ar_hostdata, sdp->sd_args.ar_hostdata))
1119                 return -EINVAL;
1120
1121         /* Some flags must not be changed */
1122         if (args_neq(&args, &sdp->sd_args, spectator) ||
1123             args_neq(&args, &sdp->sd_args, ignore_local_fs) ||
1124             args_neq(&args, &sdp->sd_args, localflocks) ||
1125             args_neq(&args, &sdp->sd_args, localcaching) ||
1126             args_neq(&args, &sdp->sd_args, meta))
1127                 return -EINVAL;
1128
1129         if (sdp->sd_args.ar_spectator)
1130                 *flags |= MS_RDONLY;
1131
1132         if ((sb->s_flags ^ *flags) & MS_RDONLY) {
1133                 if (*flags & MS_RDONLY)
1134                         error = gfs2_make_fs_ro(sdp);
1135                 else
1136                         error = gfs2_make_fs_rw(sdp);
1137                 if (error)
1138                         return error;
1139         }
1140
1141         sdp->sd_args = args;
1142         if (sdp->sd_args.ar_posix_acl)
1143                 sb->s_flags |= MS_POSIXACL;
1144         else
1145                 sb->s_flags &= ~MS_POSIXACL;
1146         spin_lock(&gt->gt_spin);
1147         gt->gt_log_flush_secs = args.ar_commit;
1148         gt->gt_quota_quantum = args.ar_quota_quantum;
1149         if (args.ar_statfs_quantum) {
1150                 gt->gt_statfs_slow = 0;
1151                 gt->gt_statfs_quantum = args.ar_statfs_quantum;
1152         }
1153         else {
1154                 gt->gt_statfs_slow = 1;
1155                 gt->gt_statfs_quantum = 30;
1156         }
1157         spin_unlock(&gt->gt_spin);
1158
1159         gfs2_online_uevent(sdp);
1160         return 0;
1161 }
1162
1163 /**
1164  * gfs2_drop_inode - Drop an inode (test for remote unlink)
1165  * @inode: The inode to drop
1166  *
1167  * If we've received a callback on an iopen lock then its because a
1168  * remote node tried to deallocate the inode but failed due to this node
1169  * still having the inode open. Here we mark the link count zero
1170  * since we know that it must have reached zero if the GLF_DEMOTE flag
1171  * is set on the iopen glock. If we didn't do a disk read since the
1172  * remote node removed the final link then we might otherwise miss
1173  * this event. This check ensures that this node will deallocate the
1174  * inode's blocks, or alternatively pass the baton on to another
1175  * node for later deallocation.
1176  */
1177
1178 static void gfs2_drop_inode(struct inode *inode)
1179 {
1180         struct gfs2_inode *ip = GFS2_I(inode);
1181
1182         if (test_bit(GIF_USER, &ip->i_flags) && inode->i_nlink) {
1183                 struct gfs2_glock *gl = ip->i_iopen_gh.gh_gl;
1184                 if (gl && test_bit(GLF_DEMOTE, &gl->gl_flags))
1185                         clear_nlink(inode);
1186         }
1187         generic_drop_inode(inode);
1188 }
1189
1190 /**
1191  * gfs2_clear_inode - Deallocate an inode when VFS is done with it
1192  * @inode: The VFS inode
1193  *
1194  */
1195
1196 static void gfs2_clear_inode(struct inode *inode)
1197 {
1198         struct gfs2_inode *ip = GFS2_I(inode);
1199
1200         /* This tells us its a "real" inode and not one which only
1201          * serves to contain an address space (see rgrp.c, meta_io.c)
1202          * which therefore doesn't have its own glocks.
1203          */
1204         if (test_bit(GIF_USER, &ip->i_flags)) {
1205                 ip->i_gl->gl_object = NULL;
1206                 gfs2_glock_put(ip->i_gl);
1207                 ip->i_gl = NULL;
1208                 if (ip->i_iopen_gh.gh_gl) {
1209                         ip->i_iopen_gh.gh_gl->gl_object = NULL;
1210                         gfs2_glock_dq_uninit(&ip->i_iopen_gh);
1211                 }
1212         }
1213 }
1214
1215 static int is_ancestor(const struct dentry *d1, const struct dentry *d2)
1216 {
1217         do {
1218                 if (d1 == d2)
1219                         return 1;
1220                 d1 = d1->d_parent;
1221         } while (!IS_ROOT(d1));
1222         return 0;
1223 }
1224
1225 /**
1226  * gfs2_show_options - Show mount options for /proc/mounts
1227  * @s: seq_file structure
1228  * @mnt: vfsmount
1229  *
1230  * Returns: 0 on success or error code
1231  */
1232
1233 static int gfs2_show_options(struct seq_file *s, struct vfsmount *mnt)
1234 {
1235         struct gfs2_sbd *sdp = mnt->mnt_sb->s_fs_info;
1236         struct gfs2_args *args = &sdp->sd_args;
1237         int val;
1238
1239         if (is_ancestor(mnt->mnt_root, sdp->sd_master_dir))
1240                 seq_printf(s, ",meta");
1241         if (args->ar_lockproto[0])
1242                 seq_printf(s, ",lockproto=%s", args->ar_lockproto);
1243         if (args->ar_locktable[0])
1244                 seq_printf(s, ",locktable=%s", args->ar_locktable);
1245         if (args->ar_hostdata[0])
1246                 seq_printf(s, ",hostdata=%s", args->ar_hostdata);
1247         if (args->ar_spectator)
1248                 seq_printf(s, ",spectator");
1249         if (args->ar_ignore_local_fs)
1250                 seq_printf(s, ",ignore_local_fs");
1251         if (args->ar_localflocks)
1252                 seq_printf(s, ",localflocks");
1253         if (args->ar_localcaching)
1254                 seq_printf(s, ",localcaching");
1255         if (args->ar_debug)
1256                 seq_printf(s, ",debug");
1257         if (args->ar_upgrade)
1258                 seq_printf(s, ",upgrade");
1259         if (args->ar_posix_acl)
1260                 seq_printf(s, ",acl");
1261         if (args->ar_quota != GFS2_QUOTA_DEFAULT) {
1262                 char *state;
1263                 switch (args->ar_quota) {
1264                 case GFS2_QUOTA_OFF:
1265                         state = "off";
1266                         break;
1267                 case GFS2_QUOTA_ACCOUNT:
1268                         state = "account";
1269                         break;
1270                 case GFS2_QUOTA_ON:
1271                         state = "on";
1272                         break;
1273                 default:
1274                         state = "unknown";
1275                         break;
1276                 }
1277                 seq_printf(s, ",quota=%s", state);
1278         }
1279         if (args->ar_suiddir)
1280                 seq_printf(s, ",suiddir");
1281         if (args->ar_data != GFS2_DATA_DEFAULT) {
1282                 char *state;
1283                 switch (args->ar_data) {
1284                 case GFS2_DATA_WRITEBACK:
1285                         state = "writeback";
1286                         break;
1287                 case GFS2_DATA_ORDERED:
1288                         state = "ordered";
1289                         break;
1290                 default:
1291                         state = "unknown";
1292                         break;
1293                 }
1294                 seq_printf(s, ",data=%s", state);
1295         }
1296         if (args->ar_discard)
1297                 seq_printf(s, ",discard");
1298         val = sdp->sd_tune.gt_log_flush_secs;
1299         if (val != 60)
1300                 seq_printf(s, ",commit=%d", val);
1301         val = sdp->sd_tune.gt_statfs_quantum;
1302         if (val != 30)
1303                 seq_printf(s, ",statfs_quantum=%d", val);
1304         val = sdp->sd_tune.gt_quota_quantum;
1305         if (val != 60)
1306                 seq_printf(s, ",quota_quantum=%d", val);
1307         if (args->ar_statfs_percent)
1308                 seq_printf(s, ",statfs_percent=%d", args->ar_statfs_percent);
1309         if (args->ar_errors != GFS2_ERRORS_DEFAULT) {
1310                 const char *state;
1311
1312                 switch (args->ar_errors) {
1313                 case GFS2_ERRORS_WITHDRAW:
1314                         state = "withdraw";
1315                         break;
1316                 case GFS2_ERRORS_PANIC:
1317                         state = "panic";
1318                         break;
1319                 default:
1320                         state = "unknown";
1321                         break;
1322                 }
1323                 seq_printf(s, ",errors=%s", state);
1324         }
1325         return 0;
1326 }
1327
1328 /*
1329  * We have to (at the moment) hold the inodes main lock to cover
1330  * the gap between unlocking the shared lock on the iopen lock and
1331  * taking the exclusive lock. I'd rather do a shared -> exclusive
1332  * conversion on the iopen lock, but we can change that later. This
1333  * is safe, just less efficient.
1334  */
1335
1336 static void gfs2_delete_inode(struct inode *inode)
1337 {
1338         struct gfs2_sbd *sdp = inode->i_sb->s_fs_info;
1339         struct gfs2_inode *ip = GFS2_I(inode);
1340         struct gfs2_holder gh;
1341         int error;
1342
1343         if (!test_bit(GIF_USER, &ip->i_flags))
1344                 goto out;
1345
1346         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
1347         if (unlikely(error)) {
1348                 gfs2_glock_dq_uninit(&ip->i_iopen_gh);
1349                 goto out;
1350         }
1351
1352         error = gfs2_check_blk_type(sdp, ip->i_no_addr, GFS2_BLKST_UNLINKED);
1353         if (error)
1354                 goto out_truncate;
1355
1356         gfs2_glock_dq_wait(&ip->i_iopen_gh);
1357         gfs2_holder_reinit(LM_ST_EXCLUSIVE, LM_FLAG_TRY_1CB | GL_NOCACHE, &ip->i_iopen_gh);
1358         error = gfs2_glock_nq(&ip->i_iopen_gh);
1359         if (error)
1360                 goto out_truncate;
1361
1362         if (S_ISDIR(inode->i_mode) &&
1363             (ip->i_diskflags & GFS2_DIF_EXHASH)) {
1364                 error = gfs2_dir_exhash_dealloc(ip);
1365                 if (error)
1366                         goto out_unlock;
1367         }
1368
1369         if (ip->i_eattr) {
1370                 error = gfs2_ea_dealloc(ip);
1371                 if (error)
1372                         goto out_unlock;
1373         }
1374
1375         if (!gfs2_is_stuffed(ip)) {
1376                 error = gfs2_file_dealloc(ip);
1377                 if (error)
1378                         goto out_unlock;
1379         }
1380
1381         error = gfs2_dinode_dealloc(ip);
1382         if (error)
1383                 goto out_unlock;
1384
1385 out_truncate:
1386         error = gfs2_trans_begin(sdp, 0, sdp->sd_jdesc->jd_blocks);
1387         if (error)
1388                 goto out_unlock;
1389         /* Needs to be done before glock release & also in a transaction */
1390         truncate_inode_pages(&inode->i_data, 0);
1391         gfs2_trans_end(sdp);
1392
1393 out_unlock:
1394         if (test_bit(HIF_HOLDER, &ip->i_iopen_gh.gh_iflags))
1395                 gfs2_glock_dq(&ip->i_iopen_gh);
1396         gfs2_holder_uninit(&ip->i_iopen_gh);
1397         gfs2_glock_dq_uninit(&gh);
1398         if (error && error != GLR_TRYFAILED && error != -EROFS)
1399                 fs_warn(sdp, "gfs2_delete_inode: %d\n", error);
1400 out:
1401         truncate_inode_pages(&inode->i_data, 0);
1402         clear_inode(inode);
1403 }
1404
1405 static struct inode *gfs2_alloc_inode(struct super_block *sb)
1406 {
1407         struct gfs2_inode *ip;
1408
1409         ip = kmem_cache_alloc(gfs2_inode_cachep, GFP_KERNEL);
1410         if (ip) {
1411                 ip->i_flags = 0;
1412                 ip->i_gl = NULL;
1413         }
1414         return &ip->i_inode;
1415 }
1416
1417 static void gfs2_destroy_inode(struct inode *inode)
1418 {
1419         kmem_cache_free(gfs2_inode_cachep, inode);
1420 }
1421
1422 const struct super_operations gfs2_super_ops = {
1423         .alloc_inode            = gfs2_alloc_inode,
1424         .destroy_inode          = gfs2_destroy_inode,
1425         .write_inode            = gfs2_write_inode,
1426         .delete_inode           = gfs2_delete_inode,
1427         .put_super              = gfs2_put_super,
1428         .sync_fs                = gfs2_sync_fs,
1429         .freeze_fs              = gfs2_freeze,
1430         .unfreeze_fs            = gfs2_unfreeze,
1431         .statfs                 = gfs2_statfs,
1432         .remount_fs             = gfs2_remount_fs,
1433         .clear_inode            = gfs2_clear_inode,
1434         .drop_inode             = gfs2_drop_inode,
1435         .show_options           = gfs2_show_options,
1436 };
1437