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 #include <linux/wait.h>
  25 #include <linux/writeback.h>
  26
  27 #include "gfs2.h"
  28 #include "incore.h"
  29 #include "bmap.h"
  30 #include "dir.h"
  31 #include "glock.h"
  32 #include "glops.h"
  33 #include "inode.h"
  34 #include "log.h"
  35 #include "meta_io.h"
  36 #include "quota.h"
  37 #include "recovery.h"
  38 #include "rgrp.h"
  39 #include "super.h"
  40 #include "trans.h"
  41 #include "util.h"
  42 #include "sys.h"
  43 #include "xattr.h"
  44
  45 #define args_neq(a1, a2, x) ((a1)->ar_##x != (a2)->ar_##x)
  46
  47 enum {
  48         Opt_lockproto,
  49         Opt_locktable,
  50         Opt_hostdata,
  51         Opt_spectator,
  52         Opt_ignore_local_fs,
  53         Opt_localflocks,
  54         Opt_localcaching,
  55         Opt_debug,
  56         Opt_nodebug,
  57         Opt_upgrade,
  58         Opt_acl,
  59         Opt_noacl,
  60         Opt_quota_off,
  61         Opt_quota_account,
  62         Opt_quota_on,
  63         Opt_quota,
  64         Opt_noquota,
  65         Opt_suiddir,
  66         Opt_nosuiddir,
  67         Opt_data_writeback,
  68         Opt_data_ordered,
  69         Opt_meta,
  70         Opt_discard,
  71         Opt_nodiscard,
  72         Opt_commit,
  73         Opt_err_withdraw,
  74         Opt_err_panic,
  75         Opt_statfs_quantum,
  76         Opt_statfs_percent,
  77         Opt_quota_quantum,
  78         Opt_barrier,
  79         Opt_nobarrier,
  80         Opt_error,
  81 };
  82
  83 static const match_table_t tokens = {
  84         {Opt_lockproto, "lockproto=%s"},
  85         {Opt_locktable, "locktable=%s"},
  86         {Opt_hostdata, "hostdata=%s"},
  87         {Opt_spectator, "spectator"},
  88         {Opt_ignore_local_fs, "ignore_local_fs"},
  89         {Opt_localflocks, "localflocks"},
  90         {Opt_localcaching, "localcaching"},
  91         {Opt_debug, "debug"},
  92         {Opt_nodebug, "nodebug"},
  93         {Opt_upgrade, "upgrade"},
  94         {Opt_acl, "acl"},
  95         {Opt_noacl, "noacl"},
  96         {Opt_quota_off, "quota=off"},
  97         {Opt_quota_account, "quota=account"},
  98         {Opt_quota_on, "quota=on"},
  99         {Opt_quota, "quota"},
 100         {Opt_noquota, "noquota"},
 101         {Opt_suiddir, "suiddir"},
 102         {Opt_nosuiddir, "nosuiddir"},
 103         {Opt_data_writeback, "data=writeback"},
 104         {Opt_data_ordered, "data=ordered"},
 105         {Opt_meta, "meta"},
 106         {Opt_discard, "discard"},
 107         {Opt_nodiscard, "nodiscard"},
 108         {Opt_commit, "commit=%d"},
 109         {Opt_err_withdraw, "errors=withdraw"},
 110         {Opt_err_panic, "errors=panic"},
 111         {Opt_statfs_quantum, "statfs_quantum=%d"},
 112         {Opt_statfs_percent, "statfs_percent=%d"},
 113         {Opt_quota_quantum, "quota_quantum=%d"},
 114         {Opt_barrier, "barrier"},
 115         {Opt_nobarrier, "nobarrier"},
 116         {Opt_error, NULL}
 117 };
 118
 119 /**
 120  * gfs2_mount_args - Parse mount options
 121  * @args: The structure into which the parsed options will be written
 122  * @options: The options to parse
 123  *
 124  * Return: errno
 125  */
 126
 127 int gfs2_mount_args(struct gfs2_args *args, char *options)
 128 {
 129         char *o;
 130         int token;
 131         substring_t tmp[MAX_OPT_ARGS];
 132         int rv;
 133
 134         /* Split the options into tokens with the "," character and
 135            process them */
 136
 137         while (1) {
 138                 o = strsep(&options, ",");
 139                 if (o == NULL)
 140                         break;
 141                 if (*o == '\0')
 142                         continue;
 143
 144                 token = match_token(o, tokens, tmp);
 145                 switch (token) {
 146                 case Opt_lockproto:
 147                         match_strlcpy(args->ar_lockproto, &tmp[0],
 148                                       GFS2_LOCKNAME_LEN);
 149                         break;
 150                 case Opt_locktable:
 151                         match_strlcpy(args->ar_locktable, &tmp[0],
 152                                       GFS2_LOCKNAME_LEN);
 153                         break;
 154                 case Opt_hostdata:
 155                         match_strlcpy(args->ar_hostdata, &tmp[0],
 156                                       GFS2_LOCKNAME_LEN);
 157                         break;
 158                 case Opt_spectator:
 159                         args->ar_spectator = 1;
 160                         break;
 161                 case Opt_ignore_local_fs:
 162                         args->ar_ignore_local_fs = 1;
 163                         break;
 164                 case Opt_localflocks:
 165                         args->ar_localflocks = 1;
 166                         break;
 167                 case Opt_localcaching:
 168                         args->ar_localcaching = 1;
 169                         break;
 170                 case Opt_debug:
 171                         if (args->ar_errors == GFS2_ERRORS_PANIC) {
 172                                 printk(KERN_WARNING "GFS2: -o debug and -o errors=panic "
 173                                        "are mutually exclusive.\n");
 174                                 return -EINVAL;
 175                         }
 176                         args->ar_debug = 1;
 177                         break;
 178                 case Opt_nodebug:
 179                         args->ar_debug = 0;
 180                         break;
 181                 case Opt_upgrade:
 182                         args->ar_upgrade = 1;
 183                         break;
 184                 case Opt_acl:
 185                         args->ar_posix_acl = 1;
 186                         break;
 187                 case Opt_noacl:
 188                         args->ar_posix_acl = 0;
 189                         break;
 190                 case Opt_quota_off:
 191                 case Opt_noquota:
 192                         args->ar_quota = GFS2_QUOTA_OFF;
 193                         break;
 194                 case Opt_quota_account:
 195                         args->ar_quota = GFS2_QUOTA_ACCOUNT;
 196                         break;
 197                 case Opt_quota_on:
 198                 case Opt_quota:
 199                         args->ar_quota = GFS2_QUOTA_ON;
 200                         break;
 201                 case Opt_suiddir:
 202                         args->ar_suiddir = 1;
 203                         break;
 204                 case Opt_nosuiddir:
 205                         args->ar_suiddir = 0;
 206                         break;
 207                 case Opt_data_writeback:
 208                         args->ar_data = GFS2_DATA_WRITEBACK;
 209                         break;
 210                 case Opt_data_ordered:
 211                         args->ar_data = GFS2_DATA_ORDERED;
 212                         break;
 213                 case Opt_meta:
 214                         args->ar_meta = 1;
 215                         break;
 216                 case Opt_discard:
 217                         args->ar_discard = 1;
 218                         break;
 219                 case Opt_nodiscard:
 220                         args->ar_discard = 0;
 221                         break;
 222                 case Opt_commit:
 223                         rv = match_int(&tmp[0], &args->ar_commit);
 224                         if (rv || args->ar_commit <= 0) {
 225                                 printk(KERN_WARNING "GFS2: commit mount option requires a positive numeric argument\n");
 226                                 return rv ? rv : -EINVAL;
 227                         }
 228                         break;
 229                 case Opt_statfs_quantum:
 230                         rv = match_int(&tmp[0], &args->ar_statfs_quantum);
 231                         if (rv || args->ar_statfs_quantum < 0) {
 232                                 printk(KERN_WARNING "GFS2: statfs_quantum mount option requires a non-negative numeric argument\n");
 233                                 return rv ? rv : -EINVAL;
 234                         }
 235                         break;
 236                 case Opt_quota_quantum:
 237                         rv = match_int(&tmp[0], &args->ar_quota_quantum);
 238                         if (rv || args->ar_quota_quantum <= 0) {
 239                                 printk(KERN_WARNING "GFS2: quota_quantum mount option requires a positive numeric argument\n");
 240                                 return rv ? rv : -EINVAL;
 241                         }
 242                         break;
 243                 case Opt_statfs_percent:
 244                         rv = match_int(&tmp[0], &args->ar_statfs_percent);
 245                         if (rv || args->ar_statfs_percent < 0 ||
 246                             args->ar_statfs_percent > 100) {
 247                                 printk(KERN_WARNING "statfs_percent mount option requires a numeric argument between 0 and 100\n");
 248                                 return rv ? rv : -EINVAL;
 249                         }
 250                         break;
 251                 case Opt_err_withdraw:
 252                         args->ar_errors = GFS2_ERRORS_WITHDRAW;
 253                         break;
 254                 case Opt_err_panic:
 255                         if (args->ar_debug) {
 256                                 printk(KERN_WARNING "GFS2: -o debug and -o errors=panic "
 257                                         "are mutually exclusive.\n");
 258                                 return -EINVAL;
 259                         }
 260                         args->ar_errors = GFS2_ERRORS_PANIC;
 261                         break;
 262                 case Opt_barrier:
 263                         args->ar_nobarrier = 0;
 264                         break;
 265                 case Opt_nobarrier:
 266                         args->ar_nobarrier = 1;
 267                         break;
 268                 case Opt_error:
 269                 default:
 270                         printk(KERN_WARNING "GFS2: invalid mount option: %s\n", o);
 271                         return -EINVAL;
 272                 }
 273         }
 274
 275         return 0;
 276 }
 277
 278 /**
 279  * gfs2_jindex_free - Clear all the journal index information
 280  * @sdp: The GFS2 superblock
 281  *
 282  */
 283
 284 void gfs2_jindex_free(struct gfs2_sbd *sdp)
 285 {
 286         struct list_head list, *head;
 287         struct gfs2_jdesc *jd;
 288         struct gfs2_journal_extent *jext;
 289
 290         spin_lock(&sdp->sd_jindex_spin);
 291         list_add(&list, &sdp->sd_jindex_list);
 292         list_del_init(&sdp->sd_jindex_list);
 293         sdp->sd_journals = 0;
 294         spin_unlock(&sdp->sd_jindex_spin);
 295
 296         while (!list_empty(&list)) {
 297                 jd = list_entry(list.next, struct gfs2_jdesc, jd_list);
 298                 head = &jd->extent_list;
 299                 while (!list_empty(head)) {
 300                         jext = list_entry(head->next,
 301                                           struct gfs2_journal_extent,
 302                                           extent_list);
 303                         list_del(&jext->extent_list);
 304                         kfree(jext);
 305                 }
 306                 list_del(&jd->jd_list);
 307                 iput(jd->jd_inode);
 308                 kfree(jd);
 309         }
 310 }
 311
 312 static struct gfs2_jdesc *jdesc_find_i(struct list_head *head, unsigned int jid)
 313 {
 314         struct gfs2_jdesc *jd;
 315         int found = 0;
 316
 317         list_for_each_entry(jd, head, jd_list) {
 318                 if (jd->jd_jid == jid) {
 319                         found = 1;
 320                         break;
 321                 }
 322         }
 323
 324         if (!found)
 325                 jd = NULL;
 326
 327         return jd;
 328 }
 329
 330 struct gfs2_jdesc *gfs2_jdesc_find(struct gfs2_sbd *sdp, unsigned int jid)
 331 {
 332         struct gfs2_jdesc *jd;
 333
 334         spin_lock(&sdp->sd_jindex_spin);
 335         jd = jdesc_find_i(&sdp->sd_jindex_list, jid);
 336         spin_unlock(&sdp->sd_jindex_spin);
 337
 338         return jd;
 339 }
 340
 341 int gfs2_jdesc_check(struct gfs2_jdesc *jd)
 342 {
 343         struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
 344         struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
 345         int ar;
 346         int error;
 347
 348         if (ip->i_disksize < (8 << 20) || ip->i_disksize > (1 << 30) ||
 349             (ip->i_disksize & (sdp->sd_sb.sb_bsize - 1))) {
 350                 gfs2_consist_inode(ip);
 351                 return -EIO;
 352         }
 353         jd->jd_blocks = ip->i_disksize >> sdp->sd_sb.sb_bsize_shift;
 354
 355         error = gfs2_write_alloc_required(ip, 0, ip->i_disksize, &ar);
 356         if (!error && ar) {
 357                 gfs2_consist_inode(ip);
 358                 error = -EIO;
 359         }
 360
 361         return error;
 362 }
 363
 364 /**
 365  * gfs2_make_fs_rw - Turn a Read-Only FS into a Read-Write one
 366  * @sdp: the filesystem
 367  *
 368  * Returns: errno
 369  */
 370
 371 int gfs2_make_fs_rw(struct gfs2_sbd *sdp)
 372 {
 373         struct gfs2_inode *ip = GFS2_I(sdp->sd_jdesc->jd_inode);
 374         struct gfs2_glock *j_gl = ip->i_gl;
 375         struct gfs2_holder t_gh;
 376         struct gfs2_log_header_host head;
 377         int error;
 378
 379         error = gfs2_glock_nq_init(sdp->sd_trans_gl, LM_ST_SHARED, 0, &t_gh);
 380         if (error)
 381                 return error;
 382
 383         j_gl->gl_ops->go_inval(j_gl, DIO_METADATA);
 384
 385         error = gfs2_find_jhead(sdp->sd_jdesc, &head);
 386         if (error)
 387                 goto fail;
 388
 389         if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) {
 390                 gfs2_consist(sdp);
 391                 error = -EIO;
 392                 goto fail;
 393         }
 394
 395         /*  Initialize some head of the log stuff  */
 396         sdp->sd_log_sequence = head.lh_sequence + 1;
 397         gfs2_log_pointers_init(sdp, head.lh_blkno);
 398
 399         error = gfs2_quota_init(sdp);
 400         if (error)
 401                 goto fail;
 402
 403         set_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags);
 404
 405         gfs2_glock_dq_uninit(&t_gh);
 406
 407         return 0;
 408
 409 fail:
 410         t_gh.gh_flags |= GL_NOCACHE;
 411         gfs2_glock_dq_uninit(&t_gh);
 412
 413         return error;
 414 }
 415
 416 void gfs2_statfs_change_in(struct gfs2_statfs_change_host *sc, const void *buf)
 417 {
 418         const struct gfs2_statfs_change *str = buf;
 419
 420         sc->sc_total = be64_to_cpu(str->sc_total);
 421         sc->sc_free = be64_to_cpu(str->sc_free);
 422         sc->sc_dinodes = be64_to_cpu(str->sc_dinodes);
 423 }
 424
 425 static void gfs2_statfs_change_out(const struct gfs2_statfs_change_host *sc, void *buf)
 426 {
 427         struct gfs2_statfs_change *str = buf;
 428
 429         str->sc_total = cpu_to_be64(sc->sc_total);
 430         str->sc_free = cpu_to_be64(sc->sc_free);
 431         str->sc_dinodes = cpu_to_be64(sc->sc_dinodes);
 432 }
 433
 434 int gfs2_statfs_init(struct gfs2_sbd *sdp)
 435 {
 436         struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
 437         struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
 438         struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
 439         struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
 440         struct buffer_head *m_bh, *l_bh;
 441         struct gfs2_holder gh;
 442         int error;
 443
 444         error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE,
 445                                    &gh);
 446         if (error)
 447                 return error;
 448
 449         error = gfs2_meta_inode_buffer(m_ip, &m_bh);
 450         if (error)
 451                 goto out;
 452
 453         if (sdp->sd_args.ar_spectator) {
 454                 spin_lock(&sdp->sd_statfs_spin);
 455                 gfs2_statfs_change_in(m_sc, m_bh->b_data +
 456                                       sizeof(struct gfs2_dinode));
 457                 spin_unlock(&sdp->sd_statfs_spin);
 458         } else {
 459                 error = gfs2_meta_inode_buffer(l_ip, &l_bh);
 460                 if (error)
 461                         goto out_m_bh;
 462
 463                 spin_lock(&sdp->sd_statfs_spin);
 464                 gfs2_statfs_change_in(m_sc, m_bh->b_data +
 465                                       sizeof(struct gfs2_dinode));
 466                 gfs2_statfs_change_in(l_sc, l_bh->b_data +
 467                                       sizeof(struct gfs2_dinode));
 468                 spin_unlock(&sdp->sd_statfs_spin);
 469
 470                 brelse(l_bh);
 471         }
 472
 473 out_m_bh:
 474         brelse(m_bh);
 475 out:
 476         gfs2_glock_dq_uninit(&gh);
 477         return 0;
 478 }
 479
 480 void gfs2_statfs_change(struct gfs2_sbd *sdp, s64 total, s64 free,
 481                         s64 dinodes)
 482 {
 483         struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
 484         struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
 485         struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
 486         struct buffer_head *l_bh;
 487         s64 x, y;
 488         int need_sync = 0;
 489         int error;
 490
 491         error = gfs2_meta_inode_buffer(l_ip, &l_bh);
 492         if (error)
 493                 return;
 494
 495         gfs2_trans_add_bh(l_ip->i_gl, l_bh, 1);
 496
 497         spin_lock(&sdp->sd_statfs_spin);
 498         l_sc->sc_total += total;
 499         l_sc->sc_free += free;
 500         l_sc->sc_dinodes += dinodes;
 501         gfs2_statfs_change_out(l_sc, l_bh->b_data + sizeof(struct gfs2_dinode));
 502         if (sdp->sd_args.ar_statfs_percent) {
 503                 x = 100 * l_sc->sc_free;
 504                 y = m_sc->sc_free * sdp->sd_args.ar_statfs_percent;
 505                 if (x >= y || x <= -y)
 506                         need_sync = 1;
 507         }
 508         spin_unlock(&sdp->sd_statfs_spin);
 509
 510         brelse(l_bh);
 511         if (need_sync)
 512                 gfs2_wake_up_statfs(sdp);
 513 }
 514
 515 void update_statfs(struct gfs2_sbd *sdp, struct buffer_head *m_bh,
 516                    struct buffer_head *l_bh)
 517 {
 518         struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
 519         struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
 520         struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
 521         struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
 522
 523         gfs2_trans_add_bh(l_ip->i_gl, l_bh, 1);
 524
 525         spin_lock(&sdp->sd_statfs_spin);
 526         m_sc->sc_total += l_sc->sc_total;
 527         m_sc->sc_free += l_sc->sc_free;
 528         m_sc->sc_dinodes += l_sc->sc_dinodes;
 529         memset(l_sc, 0, sizeof(struct gfs2_statfs_change));
 530         memset(l_bh->b_data + sizeof(struct gfs2_dinode),
 531                0, sizeof(struct gfs2_statfs_change));
 532         spin_unlock(&sdp->sd_statfs_spin);
 533
 534         gfs2_trans_add_bh(m_ip->i_gl, m_bh, 1);
 535         gfs2_statfs_change_out(m_sc, m_bh->b_data + sizeof(struct gfs2_dinode));
 536 }
 537
 538 int gfs2_statfs_sync(struct super_block *sb, int type)
 539 {
 540         struct gfs2_sbd *sdp = sb->s_fs_info;
 541         struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
 542         struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
 543         struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
 544         struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
 545         struct gfs2_holder gh;
 546         struct buffer_head *m_bh, *l_bh;
 547         int error;
 548
 549         error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE,
 550                                    &gh);
 551         if (error)
 552                 return error;
 553
 554         error = gfs2_meta_inode_buffer(m_ip, &m_bh);
 555         if (error)
 556                 goto out;
 557
 558         spin_lock(&sdp->sd_statfs_spin);
 559         gfs2_statfs_change_in(m_sc, m_bh->b_data +
 560                               sizeof(struct gfs2_dinode));
 561         if (!l_sc->sc_total && !l_sc->sc_free && !l_sc->sc_dinodes) {
 562                 spin_unlock(&sdp->sd_statfs_spin);
 563                 goto out_bh;
 564         }
 565         spin_unlock(&sdp->sd_statfs_spin);
 566
 567         error = gfs2_meta_inode_buffer(l_ip, &l_bh);
 568         if (error)
 569                 goto out_bh;
 570
 571         error = gfs2_trans_begin(sdp, 2 * RES_DINODE, 0);
 572         if (error)
 573                 goto out_bh2;
 574
 575         update_statfs(sdp, m_bh, l_bh);
 576         sdp->sd_statfs_force_sync = 0;
 577
 578         gfs2_trans_end(sdp);
 579
 580 out_bh2:
 581         brelse(l_bh);
 582 out_bh:
 583         brelse(m_bh);
 584 out:
 585         gfs2_glock_dq_uninit(&gh);
 586         return error;
 587 }
 588
 589 struct lfcc {
 590         struct list_head list;
 591         struct gfs2_holder gh;
 592 };
 593
 594 /**
 595  * gfs2_lock_fs_check_clean - Stop all writes to the FS and check that all
 596  *                            journals are clean
 597  * @sdp: the file system
 598  * @state: the state to put the transaction lock into
 599  * @t_gh: the hold on the transaction lock
 600  *
 601  * Returns: errno
 602  */
 603
 604 static int gfs2_lock_fs_check_clean(struct gfs2_sbd *sdp,
 605                                     struct gfs2_holder *t_gh)
 606 {
 607         struct gfs2_inode *ip;
 608         struct gfs2_jdesc *jd;
 609         struct lfcc *lfcc;
 610         LIST_HEAD(list);
 611         struct gfs2_log_header_host lh;
 612         int error;
 613
 614         list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
 615                 lfcc = kmalloc(sizeof(struct lfcc), GFP_KERNEL);
 616                 if (!lfcc) {
 617                         error = -ENOMEM;
 618                         goto out;
 619                 }
 620                 ip = GFS2_I(jd->jd_inode);
 621                 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &lfcc->gh);
 622                 if (error) {
 623                         kfree(lfcc);
 624                         goto out;
 625                 }
 626                 list_add(&lfcc->list, &list);
 627         }
 628
 629         error = gfs2_glock_nq_init(sdp->sd_trans_gl, LM_ST_DEFERRED,
 630                                    GL_NOCACHE, t_gh);
 631
 632         list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
 633                 error = gfs2_jdesc_check(jd);
 634                 if (error)
 635                         break;
 636                 error = gfs2_find_jhead(jd, &lh);
 637                 if (error)
 638                         break;
 639                 if (!(lh.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) {
 640                         error = -EBUSY;
 641                         break;
 642                 }
 643         }
 644
 645         if (error)
 646                 gfs2_glock_dq_uninit(t_gh);
 647
 648 out:
 649         while (!list_empty(&list)) {
 650                 lfcc = list_entry(list.next, struct lfcc, list);
 651                 list_del(&lfcc->list);
 652                 gfs2_glock_dq_uninit(&lfcc->gh);
 653                 kfree(lfcc);
 654         }
 655         return error;
 656 }
 657
 658 /**
 659  * gfs2_freeze_fs - freezes the file system
 660  * @sdp: the file system
 661  *
 662  * This function flushes data and meta data for all machines by
 663  * aquiring the transaction log exclusively.  All journals are
 664  * ensured to be in a clean state as well.
 665  *
 666  * Returns: errno
 667  */
 668
 669 int gfs2_freeze_fs(struct gfs2_sbd *sdp)
 670 {
 671         int error = 0;
 672
 673         mutex_lock(&sdp->sd_freeze_lock);
 674
 675         if (!sdp->sd_freeze_count++) {
 676                 error = gfs2_lock_fs_check_clean(sdp, &sdp->sd_freeze_gh);
 677                 if (error)
 678                         sdp->sd_freeze_count--;
 679         }
 680
 681         mutex_unlock(&sdp->sd_freeze_lock);
 682
 683         return error;
 684 }
 685
 686 /**
 687  * gfs2_unfreeze_fs - unfreezes the file system
 688  * @sdp: the file system
 689  *
 690  * This function allows the file system to proceed by unlocking
 691  * the exclusively held transaction lock.  Other GFS2 nodes are
 692  * now free to acquire the lock shared and go on with their lives.
 693  *
 694  */
 695
 696 void gfs2_unfreeze_fs(struct gfs2_sbd *sdp)
 697 {
 698         mutex_lock(&sdp->sd_freeze_lock);
 699
 700         if (sdp->sd_freeze_count && !--sdp->sd_freeze_count)
 701                 gfs2_glock_dq_uninit(&sdp->sd_freeze_gh);
 702
 703         mutex_unlock(&sdp->sd_freeze_lock);
 704 }
 705
 706
 707 /**
 708  * gfs2_write_inode - Make sure the inode is stable on the disk
 709  * @inode: The inode
 710  * @sync: synchronous write flag
 711  *
 712  * Returns: errno
 713  */
 714
 715 static int gfs2_write_inode(struct inode *inode, struct writeback_control *wbc)
 716 {
 717         struct gfs2_inode *ip = GFS2_I(inode);
 718         struct gfs2_sbd *sdp = GFS2_SB(inode);
 719         struct gfs2_holder gh;
 720         struct buffer_head *bh;
 721         struct timespec atime;
 722         struct gfs2_dinode *di;
 723         int ret = 0;
 724
 725         /* Check this is a "normal" inode, etc */
 726         if (current->flags & PF_MEMALLOC)
 727                 return 0;
 728         ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
 729         if (ret)
 730                 goto do_flush;
 731         ret = gfs2_trans_begin(sdp, RES_DINODE, 0);
 732         if (ret)
 733                 goto do_unlock;
 734         ret = gfs2_meta_inode_buffer(ip, &bh);
 735         if (ret == 0) {
 736                 di = (struct gfs2_dinode *)bh->b_data;
 737                 atime.tv_sec = be64_to_cpu(di->di_atime);
 738                 atime.tv_nsec = be32_to_cpu(di->di_atime_nsec);
 739                 if (timespec_compare(&inode->i_atime, &atime) > 0) {
 740                         gfs2_trans_add_bh(ip->i_gl, bh, 1);
 741                         gfs2_dinode_out(ip, bh->b_data);
 742                 }
 743                 brelse(bh);
 744         }
 745         gfs2_trans_end(sdp);
 746 do_unlock:
 747         gfs2_glock_dq_uninit(&gh);
 748 do_flush:
 749         if (wbc->sync_mode == WB_SYNC_ALL)
 750                 gfs2_log_flush(GFS2_SB(inode), ip->i_gl);
 751         return ret;
 752 }
 753
 754 /**
 755  * gfs2_make_fs_ro - Turn a Read-Write FS into a Read-Only one
 756  * @sdp: the filesystem
 757  *
 758  * Returns: errno
 759  */
 760
 761 static int gfs2_make_fs_ro(struct gfs2_sbd *sdp)
 762 {
 763         struct gfs2_holder t_gh;
 764         int error;
 765
 766         flush_workqueue(gfs2_delete_workqueue);
 767         gfs2_quota_sync(sdp->sd_vfs, 0);
 768         gfs2_statfs_sync(sdp->sd_vfs, 0);
 769
 770         error = gfs2_glock_nq_init(sdp->sd_trans_gl, LM_ST_SHARED, GL_NOCACHE,
 771                                    &t_gh);
 772         if (error && !test_bit(SDF_SHUTDOWN, &sdp->sd_flags))
 773                 return error;
 774
 775         gfs2_meta_syncfs(sdp);
 776         gfs2_log_shutdown(sdp);
 777
 778         clear_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags);
 779
 780         if (t_gh.gh_gl)
 781                 gfs2_glock_dq_uninit(&t_gh);
 782
 783         gfs2_quota_cleanup(sdp);
 784
 785         return error;
 786 }
 787
 788 static int gfs2_umount_recovery_wait(void *word)
 789 {
 790         schedule();
 791         return 0;
 792 }
 793
 794 /**
 795  * gfs2_put_super - Unmount the filesystem
 796  * @sb: The VFS superblock
 797  *
 798  */
 799
 800 static void gfs2_put_super(struct super_block *sb)
 801 {
 802         struct gfs2_sbd *sdp = sb->s_fs_info;
 803         int error;
 804         struct gfs2_jdesc *jd;
 805
 806         /*  Unfreeze the filesystem, if we need to  */
 807
 808         mutex_lock(&sdp->sd_freeze_lock);
 809         if (sdp->sd_freeze_count)
 810                 gfs2_glock_dq_uninit(&sdp->sd_freeze_gh);
 811         mutex_unlock(&sdp->sd_freeze_lock);
 812
 813         /* No more recovery requests */
 814         set_bit(SDF_NORECOVERY, &sdp->sd_flags);
 815         smp_mb();
 816
 817         /* Wait on outstanding recovery */
 818 restart:
 819         spin_lock(&sdp->sd_jindex_spin);
 820         list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
 821                 if (!test_bit(JDF_RECOVERY, &jd->jd_flags))
 822                         continue;
 823                 spin_unlock(&sdp->sd_jindex_spin);
 824                 wait_on_bit(&jd->jd_flags, JDF_RECOVERY,
 825                             gfs2_umount_recovery_wait, TASK_UNINTERRUPTIBLE);
 826                 goto restart;
 827         }
 828         spin_unlock(&sdp->sd_jindex_spin);
 829
 830         kthread_stop(sdp->sd_quotad_process);
 831         kthread_stop(sdp->sd_logd_process);
 832
 833         if (!(sb->s_flags & MS_RDONLY)) {
 834                 error = gfs2_make_fs_ro(sdp);
 835                 if (error)
 836                         gfs2_io_error(sdp);
 837         }
 838         /*  At this point, we're through modifying the disk  */
 839
 840         /*  Release stuff  */
 841
 842         iput(sdp->sd_jindex);
 843         iput(sdp->sd_statfs_inode);
 844         iput(sdp->sd_rindex);
 845         iput(sdp->sd_quota_inode);
 846
 847         gfs2_glock_put(sdp->sd_rename_gl);
 848         gfs2_glock_put(sdp->sd_trans_gl);
 849
 850         if (!sdp->sd_args.ar_spectator) {
 851                 gfs2_glock_dq_uninit(&sdp->sd_journal_gh);
 852                 gfs2_glock_dq_uninit(&sdp->sd_jinode_gh);
 853                 gfs2_glock_dq_uninit(&sdp->sd_sc_gh);
 854                 gfs2_glock_dq_uninit(&sdp->sd_qc_gh);
 855                 iput(sdp->sd_sc_inode);
 856                 iput(sdp->sd_qc_inode);
 857         }
 858
 859         gfs2_glock_dq_uninit(&sdp->sd_live_gh);
 860         gfs2_clear_rgrpd(sdp);
 861         gfs2_jindex_free(sdp);
 862         /*  Take apart glock structures and buffer lists  */
 863         invalidate_inodes(sdp->sd_vfs);
 864         gfs2_gl_hash_clear(sdp);
 865         /*  Unmount the locking protocol  */
 866         gfs2_lm_unmount(sdp);
 867
 868         /*  At this point, we're through participating in the lockspace  */
 869         gfs2_sys_fs_del(sdp);
 870 }
 871
 872 /**
 873  * gfs2_sync_fs - sync the filesystem
 874  * @sb: the superblock
 875  *
 876  * Flushes the log to disk.
 877  */
 878
 879 static int gfs2_sync_fs(struct super_block *sb, int wait)
 880 {
 881         if (wait && sb->s_fs_info)
 882                 gfs2_log_flush(sb->s_fs_info, NULL);
 883         return 0;
 884 }
 885
 886 /**
 887  * gfs2_freeze - prevent further writes to the filesystem
 888  * @sb: the VFS structure for the filesystem
 889  *
 890  */
 891
 892 static int gfs2_freeze(struct super_block *sb)
 893 {
 894         struct gfs2_sbd *sdp = sb->s_fs_info;
 895         int error;
 896
 897         if (test_bit(SDF_SHUTDOWN, &sdp->sd_flags))
 898                 return -EINVAL;
 899
 900         for (;;) {
 901                 error = gfs2_freeze_fs(sdp);
 902                 if (!error)
 903                         break;
 904
 905                 switch (error) {
 906                 case -EBUSY:
 907                         fs_err(sdp, "waiting for recovery before freeze\n");
 908                         break;
 909
 910                 default:
 911                         fs_err(sdp, "error freezing FS: %d\n", error);
 912                         break;
 913                 }
 914
 915                 fs_err(sdp, "retrying...\n");
 916                 msleep(1000);
 917         }
 918         return 0;
 919 }
 920
 921 /**
 922  * gfs2_unfreeze - reallow writes to the filesystem
 923  * @sb: the VFS structure for the filesystem
 924  *
 925  */
 926
 927 static int gfs2_unfreeze(struct super_block *sb)
 928 {
 929         gfs2_unfreeze_fs(sb->s_fs_info);
 930         return 0;
 931 }
 932
 933 /**
 934  * statfs_fill - fill in the sg for a given RG
 935  * @rgd: the RG
 936  * @sc: the sc structure
 937  *
 938  * Returns: 0 on success, -ESTALE if the LVB is invalid
 939  */
 940
 941 static int statfs_slow_fill(struct gfs2_rgrpd *rgd,
 942                             struct gfs2_statfs_change_host *sc)
 943 {
 944         gfs2_rgrp_verify(rgd);
 945         sc->sc_total += rgd->rd_data;
 946         sc->sc_free += rgd->rd_free;
 947         sc->sc_dinodes += rgd->rd_dinodes;
 948         return 0;
 949 }
 950
 951 /**
 952  * gfs2_statfs_slow - Stat a filesystem using asynchronous locking
 953  * @sdp: the filesystem
 954  * @sc: the sc info that will be returned
 955  *
 956  * Any error (other than a signal) will cause this routine to fall back
 957  * to the synchronous version.
 958  *
 959  * FIXME: This really shouldn't busy wait like this.
 960  *
 961  * Returns: errno
 962  */
 963
 964 static int gfs2_statfs_slow(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *sc)
 965 {
 966         struct gfs2_holder ri_gh;
 967         struct gfs2_rgrpd *rgd_next;
 968         struct gfs2_holder *gha, *gh;
 969         unsigned int slots = 64;
 970         unsigned int x;
 971         int done;
 972         int error = 0, err;
 973
 974         memset(sc, 0, sizeof(struct gfs2_statfs_change_host));
 975         gha = kcalloc(slots, sizeof(struct gfs2_holder), GFP_KERNEL);
 976         if (!gha)
 977                 return -ENOMEM;
 978
 979         error = gfs2_rindex_hold(sdp, &ri_gh);
 980         if (error)
 981                 goto out;
 982
 983         rgd_next = gfs2_rgrpd_get_first(sdp);
 984
 985         for (;;) {
 986                 done = 1;
 987
 988                 for (x = 0; x < slots; x++) {
 989                         gh = gha + x;
 990
 991                         if (gh->gh_gl && gfs2_glock_poll(gh)) {
 992                                 err = gfs2_glock_wait(gh);
 993                                 if (err) {
 994                                         gfs2_holder_uninit(gh);
 995                                         error = err;
 996                                 } else {
 997                                         if (!error)
 998                                                 error = statfs_slow_fill(
 999                                                         gh->gh_gl->gl_object, sc);
1000                                         gfs2_glock_dq_uninit(gh);
1001                                 }
1002                         }
1003
1004                         if (gh->gh_gl)
1005                                 done = 0;
1006                         else if (rgd_next && !error) {
1007                                 error = gfs2_glock_nq_init(rgd_next->rd_gl,
1008                                                            LM_ST_SHARED,
1009                                                            GL_ASYNC,
1010                                                            gh);
1011                                 rgd_next = gfs2_rgrpd_get_next(rgd_next);
1012                                 done = 0;
1013                         }
1014
1015                         if (signal_pending(current))
1016                                 error = -ERESTARTSYS;
1017                 }
1018
1019                 if (done)
1020                         break;
1021
1022                 yield();
1023         }
1024
1025         gfs2_glock_dq_uninit(&ri_gh);
1026
1027 out:
1028         kfree(gha);
1029         return error;
1030 }
1031
1032 /**
1033  * gfs2_statfs_i - Do a statfs
1034  * @sdp: the filesystem
1035  * @sg: the sg structure
1036  *
1037  * Returns: errno
1038  */
1039
1040 static int gfs2_statfs_i(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *sc)
1041 {
1042         struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
1043         struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
1044
1045         spin_lock(&sdp->sd_statfs_spin);
1046
1047         *sc = *m_sc;
1048         sc->sc_total += l_sc->sc_total;
1049         sc->sc_free += l_sc->sc_free;
1050         sc->sc_dinodes += l_sc->sc_dinodes;
1051
1052         spin_unlock(&sdp->sd_statfs_spin);
1053
1054         if (sc->sc_free < 0)
1055                 sc->sc_free = 0;
1056         if (sc->sc_free > sc->sc_total)
1057                 sc->sc_free = sc->sc_total;
1058         if (sc->sc_dinodes < 0)
1059                 sc->sc_dinodes = 0;
1060
1061         return 0;
1062 }
1063
1064 /**
1065  * gfs2_statfs - Gather and return stats about the filesystem
1066  * @sb: The superblock
1067  * @statfsbuf: The buffer
1068  *
1069  * Returns: 0 on success or error code
1070  */
1071
1072 static int gfs2_statfs(struct dentry *dentry, struct kstatfs *buf)
1073 {
1074         struct super_block *sb = dentry->d_inode->i_sb;
1075         struct gfs2_sbd *sdp = sb->s_fs_info;
1076         struct gfs2_statfs_change_host sc;
1077         int error;
1078
1079         if (gfs2_tune_get(sdp, gt_statfs_slow))
1080                 error = gfs2_statfs_slow(sdp, &sc);
1081         else
1082                 error = gfs2_statfs_i(sdp, &sc);
1083
1084         if (error)
1085                 return error;
1086
1087         buf->f_type = GFS2_MAGIC;
1088         buf->f_bsize = sdp->sd_sb.sb_bsize;
1089         buf->f_blocks = sc.sc_total;
1090         buf->f_bfree = sc.sc_free;
1091         buf->f_bavail = sc.sc_free;
1092         buf->f_files = sc.sc_dinodes + sc.sc_free;
1093         buf->f_ffree = sc.sc_free;
1094         buf->f_namelen = GFS2_FNAMESIZE;
1095
1096         return 0;
1097 }
1098
1099 /**
1100  * gfs2_remount_fs - called when the FS is remounted
1101  * @sb:  the filesystem
1102  * @flags:  the remount flags
1103  * @data:  extra data passed in (not used right now)
1104  *
1105  * Returns: errno
1106  */
1107
1108 static int gfs2_remount_fs(struct super_block *sb, int *flags, char *data)
1109 {
1110         struct gfs2_sbd *sdp = sb->s_fs_info;
1111         struct gfs2_args args = sdp->sd_args; /* Default to current settings */
1112         struct gfs2_tune *gt = &sdp->sd_tune;
1113         int error;
1114
1115         spin_lock(&gt->gt_spin);
1116         args.ar_commit = gt->gt_log_flush_secs;
1117         args.ar_quota_quantum = gt->gt_quota_quantum;
1118         if (gt->gt_statfs_slow)
1119                 args.ar_statfs_quantum = 0;
1120         else
1121                 args.ar_statfs_quantum = gt->gt_statfs_quantum;
1122         spin_unlock(&gt->gt_spin);
1123         error = gfs2_mount_args(&args, data);
1124         if (error)
1125                 return error;
1126
1127         /* Not allowed to change locking details */
1128         if (strcmp(args.ar_lockproto, sdp->sd_args.ar_lockproto) ||
1129             strcmp(args.ar_locktable, sdp->sd_args.ar_locktable) ||
1130             strcmp(args.ar_hostdata, sdp->sd_args.ar_hostdata))
1131                 return -EINVAL;
1132
1133         /* Some flags must not be changed */
1134         if (args_neq(&args, &sdp->sd_args, spectator) ||
1135             args_neq(&args, &sdp->sd_args, ignore_local_fs) ||
1136             args_neq(&args, &sdp->sd_args, localflocks) ||
1137             args_neq(&args, &sdp->sd_args, localcaching) ||
1138             args_neq(&args, &sdp->sd_args, meta))
1139                 return -EINVAL;
1140
1141         if (sdp->sd_args.ar_spectator)
1142                 *flags |= MS_RDONLY;
1143
1144         if ((sb->s_flags ^ *flags) & MS_RDONLY) {
1145                 if (*flags & MS_RDONLY)
1146                         error = gfs2_make_fs_ro(sdp);
1147                 else
1148                         error = gfs2_make_fs_rw(sdp);
1149                 if (error)
1150                         return error;
1151         }
1152
1153         sdp->sd_args = args;
1154         if (sdp->sd_args.ar_posix_acl)
1155                 sb->s_flags |= MS_POSIXACL;
1156         else
1157                 sb->s_flags &= ~MS_POSIXACL;
1158         if (sdp->sd_args.ar_nobarrier)
1159                 set_bit(SDF_NOBARRIERS, &sdp->sd_flags);
1160         else
1161                 clear_bit(SDF_NOBARRIERS, &sdp->sd_flags);
1162         spin_lock(&gt->gt_spin);
1163         gt->gt_log_flush_secs = args.ar_commit;
1164         gt->gt_quota_quantum = args.ar_quota_quantum;
1165         if (args.ar_statfs_quantum) {
1166                 gt->gt_statfs_slow = 0;
1167                 gt->gt_statfs_quantum = args.ar_statfs_quantum;
1168         }
1169         else {
1170                 gt->gt_statfs_slow = 1;
1171                 gt->gt_statfs_quantum = 30;
1172         }
1173         spin_unlock(&gt->gt_spin);
1174
1175         gfs2_online_uevent(sdp);
1176         return 0;
1177 }
1178
1179 /**
1180  * gfs2_drop_inode - Drop an inode (test for remote unlink)
1181  * @inode: The inode to drop
1182  *
1183  * If we've received a callback on an iopen lock then its because a
1184  * remote node tried to deallocate the inode but failed due to this node
1185  * still having the inode open. Here we mark the link count zero
1186  * since we know that it must have reached zero if the GLF_DEMOTE flag
1187  * is set on the iopen glock. If we didn't do a disk read since the
1188  * remote node removed the final link then we might otherwise miss
1189  * this event. This check ensures that this node will deallocate the
1190  * inode's blocks, or alternatively pass the baton on to another
1191  * node for later deallocation.
1192  */
1193
1194 static void gfs2_drop_inode(struct inode *inode)
1195 {
1196         struct gfs2_inode *ip = GFS2_I(inode);
1197
1198         if (inode->i_nlink) {
1199                 struct gfs2_glock *gl = ip->i_iopen_gh.gh_gl;
1200                 if (gl && test_bit(GLF_DEMOTE, &gl->gl_flags))
1201                         clear_nlink(inode);
1202         }
1203         generic_drop_inode(inode);
1204 }
1205
1206 /**
1207  * gfs2_clear_inode - Deallocate an inode when VFS is done with it
1208  * @inode: The VFS inode
1209  *
1210  */
1211
1212 static void gfs2_clear_inode(struct inode *inode)
1213 {
1214         struct gfs2_inode *ip = GFS2_I(inode);
1215
1216         ip->i_gl->gl_object = NULL;
1217         gfs2_glock_put(ip->i_gl);
1218         ip->i_gl = NULL;
1219         if (ip->i_iopen_gh.gh_gl) {
1220                 ip->i_iopen_gh.gh_gl->gl_object = NULL;
1221                 gfs2_glock_dq_uninit(&ip->i_iopen_gh);
1222         }
1223 }
1224
1225 static int is_ancestor(const struct dentry *d1, const struct dentry *d2)
1226 {
1227         do {
1228                 if (d1 == d2)
1229                         return 1;
1230                 d1 = d1->d_parent;
1231         } while (!IS_ROOT(d1));
1232         return 0;
1233 }
1234
1235 /**
1236  * gfs2_show_options - Show mount options for /proc/mounts
1237  * @s: seq_file structure
1238  * @mnt: vfsmount
1239  *
1240  * Returns: 0 on success or error code
1241  */
1242
1243 static int gfs2_show_options(struct seq_file *s, struct vfsmount *mnt)
1244 {
1245         struct gfs2_sbd *sdp = mnt->mnt_sb->s_fs_info;
1246         struct gfs2_args *args = &sdp->sd_args;
1247         int val;
1248
1249         if (is_ancestor(mnt->mnt_root, sdp->sd_master_dir))
1250                 seq_printf(s, ",meta");
1251         if (args->ar_lockproto[0])
1252                 seq_printf(s, ",lockproto=%s", args->ar_lockproto);
1253         if (args->ar_locktable[0])
1254                 seq_printf(s, ",locktable=%s", args->ar_locktable);
1255         if (args->ar_hostdata[0])
1256                 seq_printf(s, ",hostdata=%s", args->ar_hostdata);
1257         if (args->ar_spectator)
1258                 seq_printf(s, ",spectator");
1259         if (args->ar_ignore_local_fs)
1260                 seq_printf(s, ",ignore_local_fs");
1261         if (args->ar_localflocks)
1262                 seq_printf(s, ",localflocks");
1263         if (args->ar_localcaching)
1264                 seq_printf(s, ",localcaching");
1265         if (args->ar_debug)
1266                 seq_printf(s, ",debug");
1267         if (args->ar_upgrade)
1268                 seq_printf(s, ",upgrade");
1269         if (args->ar_posix_acl)
1270                 seq_printf(s, ",acl");
1271         if (args->ar_quota != GFS2_QUOTA_DEFAULT) {
1272                 char *state;
1273                 switch (args->ar_quota) {
1274                 case GFS2_QUOTA_OFF:
1275                         state = "off";
1276                         break;
1277                 case GFS2_QUOTA_ACCOUNT:
1278                         state = "account";
1279                         break;
1280                 case GFS2_QUOTA_ON:
1281                         state = "on";
1282                         break;
1283                 default:
1284                         state = "unknown";
1285                         break;
1286                 }
1287                 seq_printf(s, ",quota=%s", state);
1288         }
1289         if (args->ar_suiddir)
1290                 seq_printf(s, ",suiddir");
1291         if (args->ar_data != GFS2_DATA_DEFAULT) {
1292                 char *state;
1293                 switch (args->ar_data) {
1294                 case GFS2_DATA_WRITEBACK:
1295                         state = "writeback";
1296                         break;
1297                 case GFS2_DATA_ORDERED:
1298                         state = "ordered";
1299                         break;
1300                 default:
1301                         state = "unknown";
1302                         break;
1303                 }
1304                 seq_printf(s, ",data=%s", state);
1305         }
1306         if (args->ar_discard)
1307                 seq_printf(s, ",discard");
1308         val = sdp->sd_tune.gt_log_flush_secs;
1309         if (val != 60)
1310                 seq_printf(s, ",commit=%d", val);
1311         val = sdp->sd_tune.gt_statfs_quantum;
1312         if (val != 30)
1313                 seq_printf(s, ",statfs_quantum=%d", val);
1314         val = sdp->sd_tune.gt_quota_quantum;
1315         if (val != 60)
1316                 seq_printf(s, ",quota_quantum=%d", val);
1317         if (args->ar_statfs_percent)
1318                 seq_printf(s, ",statfs_percent=%d", args->ar_statfs_percent);
1319         if (args->ar_errors != GFS2_ERRORS_DEFAULT) {
1320                 const char *state;
1321
1322                 switch (args->ar_errors) {
1323                 case GFS2_ERRORS_WITHDRAW:
1324                         state = "withdraw";
1325                         break;
1326                 case GFS2_ERRORS_PANIC:
1327                         state = "panic";
1328                         break;
1329                 default:
1330                         state = "unknown";
1331                         break;
1332                 }
1333                 seq_printf(s, ",errors=%s", state);
1334         }
1335         if (test_bit(SDF_NOBARRIERS, &sdp->sd_flags))
1336                 seq_printf(s, ",nobarrier");
1337
1338         return 0;
1339 }
1340
1341 /*
1342  * We have to (at the moment) hold the inodes main lock to cover
1343  * the gap between unlocking the shared lock on the iopen lock and
1344  * taking the exclusive lock. I'd rather do a shared -> exclusive
1345  * conversion on the iopen lock, but we can change that later. This
1346  * is safe, just less efficient.
1347  */
1348
1349 static void gfs2_delete_inode(struct inode *inode)
1350 {
1351         struct gfs2_sbd *sdp = inode->i_sb->s_fs_info;
1352         struct gfs2_inode *ip = GFS2_I(inode);
1353         struct gfs2_holder gh;
1354         int error;
1355
1356         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
1357         if (unlikely(error)) {
1358                 gfs2_glock_dq_uninit(&ip->i_iopen_gh);
1359                 goto out;
1360         }
1361
1362         error = gfs2_check_blk_type(sdp, ip->i_no_addr, GFS2_BLKST_UNLINKED);
1363         if (error)
1364                 goto out_truncate;
1365
1366         gfs2_glock_dq_wait(&ip->i_iopen_gh);
1367         gfs2_holder_reinit(LM_ST_EXCLUSIVE, LM_FLAG_TRY_1CB | GL_NOCACHE, &ip->i_iopen_gh);
1368         error = gfs2_glock_nq(&ip->i_iopen_gh);
1369         if (error)
1370                 goto out_truncate;
1371
1372         if (S_ISDIR(inode->i_mode) &&
1373             (ip->i_diskflags & GFS2_DIF_EXHASH)) {
1374                 error = gfs2_dir_exhash_dealloc(ip);
1375                 if (error)
1376                         goto out_unlock;
1377         }
1378
1379         if (ip->i_eattr) {
1380                 error = gfs2_ea_dealloc(ip);
1381                 if (error)
1382                         goto out_unlock;
1383         }
1384
1385         if (!gfs2_is_stuffed(ip)) {
1386                 error = gfs2_file_dealloc(ip);
1387                 if (error)
1388                         goto out_unlock;
1389         }
1390
1391         error = gfs2_dinode_dealloc(ip);
1392         if (error)
1393                 goto out_unlock;
1394
1395 out_truncate:
1396         error = gfs2_trans_begin(sdp, 0, sdp->sd_jdesc->jd_blocks);
1397         if (error)
1398                 goto out_unlock;
1399         /* Needs to be done before glock release & also in a transaction */
1400         truncate_inode_pages(&inode->i_data, 0);
1401         gfs2_trans_end(sdp);
1402
1403 out_unlock:
1404         if (test_bit(HIF_HOLDER, &ip->i_iopen_gh.gh_iflags))
1405                 gfs2_glock_dq(&ip->i_iopen_gh);
1406         gfs2_holder_uninit(&ip->i_iopen_gh);
1407         gfs2_glock_dq_uninit(&gh);
1408         if (error && error != GLR_TRYFAILED && error != -EROFS)
1409                 fs_warn(sdp, "gfs2_delete_inode: %d\n", error);
1410 out:
1411         truncate_inode_pages(&inode->i_data, 0);
1412         clear_inode(inode);
1413 }
1414
1415 static struct inode *gfs2_alloc_inode(struct super_block *sb)
1416 {
1417         struct gfs2_inode *ip;
1418
1419         ip = kmem_cache_alloc(gfs2_inode_cachep, GFP_KERNEL);
1420         if (ip) {
1421                 ip->i_flags = 0;
1422                 ip->i_gl = NULL;
1423         }
1424         return &ip->i_inode;
1425 }
1426
1427 static void gfs2_destroy_inode(struct inode *inode)
1428 {
1429         kmem_cache_free(gfs2_inode_cachep, inode);
1430 }
1431
1432 const struct super_operations gfs2_super_ops = {
1433         .alloc_inode            = gfs2_alloc_inode,
1434         .destroy_inode          = gfs2_destroy_inode,
1435         .write_inode            = gfs2_write_inode,
1436         .delete_inode           = gfs2_delete_inode,
1437         .put_super              = gfs2_put_super,
1438         .sync_fs                = gfs2_sync_fs,
1439         .freeze_fs              = gfs2_freeze,
1440         .unfreeze_fs            = gfs2_unfreeze,
1441         .statfs                 = gfs2_statfs,
1442         .remount_fs             = gfs2_remount_fs,
1443         .clear_inode            = gfs2_clear_inode,
1444         .drop_inode             = gfs2_drop_inode,
1445         .show_options           = gfs2_show_options,
1446 };
1447