SAFE public projects git trees. - safe/jmp/linux-2.6/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_barrier,
  77         Opt_nobarrier,
  78         Opt_error,
  79 };
  80
  81 static const match_table_t tokens = {
  82         {Opt_lockproto, "lockproto=%s"},
  83         {Opt_locktable, "locktable=%s"},
  84         {Opt_hostdata, "hostdata=%s"},
  85         {Opt_spectator, "spectator"},
  86         {Opt_ignore_local_fs, "ignore_local_fs"},
  87         {Opt_localflocks, "localflocks"},
  88         {Opt_localcaching, "localcaching"},
  89         {Opt_debug, "debug"},
  90         {Opt_nodebug, "nodebug"},
  91         {Opt_upgrade, "upgrade"},
  92         {Opt_acl, "acl"},
  93         {Opt_noacl, "noacl"},
  94         {Opt_quota_off, "quota=off"},
  95         {Opt_quota_account, "quota=account"},
  96         {Opt_quota_on, "quota=on"},
  97         {Opt_quota, "quota"},
  98         {Opt_noquota, "noquota"},
  99         {Opt_suiddir, "suiddir"},
 100         {Opt_nosuiddir, "nosuiddir"},
 101         {Opt_data_writeback, "data=writeback"},
 102         {Opt_data_ordered, "data=ordered"},
 103         {Opt_meta, "meta"},
 104         {Opt_discard, "discard"},
 105         {Opt_nodiscard, "nodiscard"},
 106         {Opt_commit, "commit=%d"},
 107         {Opt_err_withdraw, "errors=withdraw"},
 108         {Opt_err_panic, "errors=panic"},
 109         {Opt_statfs_quantum, "statfs_quantum=%d"},
 110         {Opt_statfs_percent, "statfs_percent=%d"},
 111         {Opt_quota_quantum, "quota_quantum=%d"},
 112         {Opt_barrier, "barrier"},
 113         {Opt_nobarrier, "nobarrier"},
 114         {Opt_error, NULL}
 115 };
 116
 117 /**
 118  * gfs2_mount_args - Parse mount options
 119  * @args: The structure into which the parsed options will be written
 120  * @options: The options to parse
 121  *
 122  * Return: errno
 123  */
 124
 125 int gfs2_mount_args(struct gfs2_args *args, char *options)
 126 {
 127         char *o;
 128         int token;
 129         substring_t tmp[MAX_OPT_ARGS];
 130         int rv;
 131
 132         /* Split the options into tokens with the "," character and
 133            process them */
 134
 135         while (1) {
 136                 o = strsep(&options, ",");
 137                 if (o == NULL)
 138                         break;
 139                 if (*o == '\0')
 140                         continue;
 141
 142                 token = match_token(o, tokens, tmp);
 143                 switch (token) {
 144                 case Opt_lockproto:
 145                         match_strlcpy(args->ar_lockproto, &tmp[0],
 146                                       GFS2_LOCKNAME_LEN);
 147                         break;
 148                 case Opt_locktable:
 149                         match_strlcpy(args->ar_locktable, &tmp[0],
 150                                       GFS2_LOCKNAME_LEN);
 151                         break;
 152                 case Opt_hostdata:
 153                         match_strlcpy(args->ar_hostdata, &tmp[0],
 154                                       GFS2_LOCKNAME_LEN);
 155                         break;
 156                 case Opt_spectator:
 157                         args->ar_spectator = 1;
 158                         break;
 159                 case Opt_ignore_local_fs:
 160                         args->ar_ignore_local_fs = 1;
 161                         break;
 162                 case Opt_localflocks:
 163                         args->ar_localflocks = 1;
 164                         break;
 165                 case Opt_localcaching:
 166                         args->ar_localcaching = 1;
 167                         break;
 168                 case Opt_debug:
 169                         if (args->ar_errors == GFS2_ERRORS_PANIC) {
 170                                 printk(KERN_WARNING "GFS2: -o debug and -o errors=panic "
 171                                        "are mutually exclusive.\n");
 172                                 return -EINVAL;
 173                         }
 174                         args->ar_debug = 1;
 175                         break;
 176                 case Opt_nodebug:
 177                         args->ar_debug = 0;
 178                         break;
 179                 case Opt_upgrade:
 180                         args->ar_upgrade = 1;
 181                         break;
 182                 case Opt_acl:
 183                         args->ar_posix_acl = 1;
 184                         break;
 185                 case Opt_noacl:
 186                         args->ar_posix_acl = 0;
 187                         break;
 188                 case Opt_quota_off:
 189                 case Opt_noquota:
 190                         args->ar_quota = GFS2_QUOTA_OFF;
 191                         break;
 192                 case Opt_quota_account:
 193                         args->ar_quota = GFS2_QUOTA_ACCOUNT;
 194                         break;
 195                 case Opt_quota_on:
 196                 case Opt_quota:
 197                         args->ar_quota = GFS2_QUOTA_ON;
 198                         break;
 199                 case Opt_suiddir:
 200                         args->ar_suiddir = 1;
 201                         break;
 202                 case Opt_nosuiddir:
 203                         args->ar_suiddir = 0;
 204                         break;
 205                 case Opt_data_writeback:
 206                         args->ar_data = GFS2_DATA_WRITEBACK;
 207                         break;
 208                 case Opt_data_ordered:
 209                         args->ar_data = GFS2_DATA_ORDERED;
 210                         break;
 211                 case Opt_meta:
 212                         args->ar_meta = 1;
 213                         break;
 214                 case Opt_discard:
 215                         args->ar_discard = 1;
 216                         break;
 217                 case Opt_nodiscard:
 218                         args->ar_discard = 0;
 219                         break;
 220                 case Opt_commit:
 221                         rv = match_int(&tmp[0], &args->ar_commit);
 222                         if (rv || args->ar_commit <= 0) {
 223                                 printk(KERN_WARNING "GFS2: commit mount option requires a positive numeric argument\n");
 224                                 return rv ? rv : -EINVAL;
 225                         }
 226                         break;
 227                 case Opt_statfs_quantum:
 228                         rv = match_int(&tmp[0], &args->ar_statfs_quantum);
 229                         if (rv || args->ar_statfs_quantum < 0) {
 230                                 printk(KERN_WARNING "GFS2: statfs_quantum mount option requires a non-negative numeric argument\n");
 231                                 return rv ? rv : -EINVAL;
 232                         }
 233                         break;
 234                 case Opt_quota_quantum:
 235                         rv = match_int(&tmp[0], &args->ar_quota_quantum);
 236                         if (rv || args->ar_quota_quantum <= 0) {
 237                                 printk(KERN_WARNING "GFS2: quota_quantum mount option requires a positive numeric argument\n");
 238                                 return rv ? rv : -EINVAL;
 239                         }
 240                         break;
 241                 case Opt_statfs_percent:
 242                         rv = match_int(&tmp[0], &args->ar_statfs_percent);
 243                         if (rv || args->ar_statfs_percent < 0 ||
 244                             args->ar_statfs_percent > 100) {
 245                                 printk(KERN_WARNING "statfs_percent mount option requires a numeric argument between 0 and 100\n");
 246                                 return rv ? rv : -EINVAL;
 247                         }
 248                         break;
 249                 case Opt_err_withdraw:
 250                         args->ar_errors = GFS2_ERRORS_WITHDRAW;
 251                         break;
 252                 case Opt_err_panic:
 253                         if (args->ar_debug) {
 254                                 printk(KERN_WARNING "GFS2: -o debug and -o errors=panic "
 255                                         "are mutually exclusive.\n");
 256                                 return -EINVAL;
 257                         }
 258                         args->ar_errors = GFS2_ERRORS_PANIC;
 259                         break;
 260                 case Opt_barrier:
 261                         args->ar_nobarrier = 0;
 262                         break;
 263                 case Opt_nobarrier:
 264                         args->ar_nobarrier = 1;
 265                         break;
 266                 case Opt_error:
 267                 default:
 268                         printk(KERN_WARNING "GFS2: invalid mount option: %s\n", o);
 269                         return -EINVAL;
 270                 }
 271         }
 272
 273         return 0;
 274 }
 275
 276 /**
 277  * gfs2_jindex_free - Clear all the journal index information
 278  * @sdp: The GFS2 superblock
 279  *
 280  */
 281
 282 void gfs2_jindex_free(struct gfs2_sbd *sdp)
 283 {
 284         struct list_head list, *head;
 285         struct gfs2_jdesc *jd;
 286         struct gfs2_journal_extent *jext;
 287
 288         spin_lock(&sdp->sd_jindex_spin);
 289         list_add(&list, &sdp->sd_jindex_list);
 290         list_del_init(&sdp->sd_jindex_list);
 291         sdp->sd_journals = 0;
 292         spin_unlock(&sdp->sd_jindex_spin);
 293
 294         while (!list_empty(&list)) {
 295                 jd = list_entry(list.next, struct gfs2_jdesc, jd_list);
 296                 head = &jd->extent_list;
 297                 while (!list_empty(head)) {
 298                         jext = list_entry(head->next,
 299                                           struct gfs2_journal_extent,
 300                                           extent_list);
 301                         list_del(&jext->extent_list);
 302                         kfree(jext);
 303                 }
 304                 list_del(&jd->jd_list);
 305                 iput(jd->jd_inode);
 306                 kfree(jd);
 307         }
 308 }
 309
 310 static struct gfs2_jdesc *jdesc_find_i(struct list_head *head, unsigned int jid)
 311 {
 312         struct gfs2_jdesc *jd;
 313         int found = 0;
 314
 315         list_for_each_entry(jd, head, jd_list) {
 316                 if (jd->jd_jid == jid) {
 317                         found = 1;
 318                         break;
 319                 }
 320         }
 321
 322         if (!found)
 323                 jd = NULL;
 324
 325         return jd;
 326 }
 327
 328 struct gfs2_jdesc *gfs2_jdesc_find(struct gfs2_sbd *sdp, unsigned int jid)
 329 {
 330         struct gfs2_jdesc *jd;
 331
 332         spin_lock(&sdp->sd_jindex_spin);
 333         jd = jdesc_find_i(&sdp->sd_jindex_list, jid);
 334         spin_unlock(&sdp->sd_jindex_spin);
 335
 336         return jd;
 337 }
 338
 339 int gfs2_jdesc_check(struct gfs2_jdesc *jd)
 340 {
 341         struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
 342         struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
 343         int ar;
 344         int error;
 345
 346         if (ip->i_disksize < (8 << 20) || ip->i_disksize > (1 << 30) ||
 347             (ip->i_disksize & (sdp->sd_sb.sb_bsize - 1))) {
 348                 gfs2_consist_inode(ip);
 349                 return -EIO;
 350         }
 351         jd->jd_blocks = ip->i_disksize >> sdp->sd_sb.sb_bsize_shift;
 352
 353         error = gfs2_write_alloc_required(ip, 0, ip->i_disksize, &ar);
 354         if (!error && ar) {
 355                 gfs2_consist_inode(ip);
 356                 error = -EIO;
 357         }
 358
 359         return error;
 360 }
 361
 362 /**
 363  * gfs2_make_fs_rw - Turn a Read-Only FS into a Read-Write one
 364  * @sdp: the filesystem
 365  *
 366  * Returns: errno
 367  */
 368
 369 int gfs2_make_fs_rw(struct gfs2_sbd *sdp)
 370 {
 371         struct gfs2_inode *ip = GFS2_I(sdp->sd_jdesc->jd_inode);
 372         struct gfs2_glock *j_gl = ip->i_gl;
 373         struct gfs2_holder t_gh;
 374         struct gfs2_log_header_host head;
 375         int error;
 376
 377         error = gfs2_glock_nq_init(sdp->sd_trans_gl, LM_ST_SHARED, 0, &t_gh);
 378         if (error)
 379                 return error;
 380
 381         j_gl->gl_ops->go_inval(j_gl, DIO_METADATA);
 382
 383         error = gfs2_find_jhead(sdp->sd_jdesc, &head);
 384         if (error)
 385                 goto fail;
 386
 387         if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) {
 388                 gfs2_consist(sdp);
 389                 error = -EIO;
 390                 goto fail;
 391         }
 392
 393         /*  Initialize some head of the log stuff  */
 394         sdp->sd_log_sequence = head.lh_sequence + 1;
 395         gfs2_log_pointers_init(sdp, head.lh_blkno);
 396
 397         error = gfs2_quota_init(sdp);
 398         if (error)
 399                 goto fail;
 400
 401         set_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags);
 402
 403         gfs2_glock_dq_uninit(&t_gh);
 404
 405         return 0;
 406
 407 fail:
 408         t_gh.gh_flags |= GL_NOCACHE;
 409         gfs2_glock_dq_uninit(&t_gh);
 410
 411         return error;
 412 }
 413
 414 void gfs2_statfs_change_in(struct gfs2_statfs_change_host *sc, const void *buf)
 415 {
 416         const struct gfs2_statfs_change *str = buf;
 417
 418         sc->sc_total = be64_to_cpu(str->sc_total);
 419         sc->sc_free = be64_to_cpu(str->sc_free);
 420         sc->sc_dinodes = be64_to_cpu(str->sc_dinodes);
 421 }
 422
 423 static void gfs2_statfs_change_out(const struct gfs2_statfs_change_host *sc, void *buf)
 424 {
 425         struct gfs2_statfs_change *str = buf;
 426
 427         str->sc_total = cpu_to_be64(sc->sc_total);
 428         str->sc_free = cpu_to_be64(sc->sc_free);
 429         str->sc_dinodes = cpu_to_be64(sc->sc_dinodes);
 430 }
 431
 432 int gfs2_statfs_init(struct gfs2_sbd *sdp)
 433 {
 434         struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
 435         struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
 436         struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
 437         struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
 438         struct buffer_head *m_bh, *l_bh;
 439         struct gfs2_holder gh;
 440         int error;
 441
 442         error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE,
 443                                    &gh);
 444         if (error)
 445                 return error;
 446
 447         error = gfs2_meta_inode_buffer(m_ip, &m_bh);
 448         if (error)
 449                 goto out;
 450
 451         if (sdp->sd_args.ar_spectator) {
 452                 spin_lock(&sdp->sd_statfs_spin);
 453                 gfs2_statfs_change_in(m_sc, m_bh->b_data +
 454                                       sizeof(struct gfs2_dinode));
 455                 spin_unlock(&sdp->sd_statfs_spin);
 456         } else {
 457                 error = gfs2_meta_inode_buffer(l_ip, &l_bh);
 458                 if (error)
 459                         goto out_m_bh;
 460
 461                 spin_lock(&sdp->sd_statfs_spin);
 462                 gfs2_statfs_change_in(m_sc, m_bh->b_data +
 463                                       sizeof(struct gfs2_dinode));
 464                 gfs2_statfs_change_in(l_sc, l_bh->b_data +
 465                                       sizeof(struct gfs2_dinode));
 466                 spin_unlock(&sdp->sd_statfs_spin);
 467
 468                 brelse(l_bh);
 469         }
 470
 471 out_m_bh:
 472         brelse(m_bh);
 473 out:
 474         gfs2_glock_dq_uninit(&gh);
 475         return 0;
 476 }
 477
 478 void gfs2_statfs_change(struct gfs2_sbd *sdp, s64 total, s64 free,
 479                         s64 dinodes)
 480 {
 481         struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
 482         struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
 483         struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
 484         struct buffer_head *l_bh;
 485         s64 x, y;
 486         int need_sync = 0;
 487         int error;
 488
 489         error = gfs2_meta_inode_buffer(l_ip, &l_bh);
 490         if (error)
 491                 return;
 492
 493         gfs2_trans_add_bh(l_ip->i_gl, l_bh, 1);
 494
 495         spin_lock(&sdp->sd_statfs_spin);
 496         l_sc->sc_total += total;
 497         l_sc->sc_free += free;
 498         l_sc->sc_dinodes += dinodes;
 499         gfs2_statfs_change_out(l_sc, l_bh->b_data + sizeof(struct gfs2_dinode));
 500         if (sdp->sd_args.ar_statfs_percent) {
 501                 x = 100 * l_sc->sc_free;
 502                 y = m_sc->sc_free * sdp->sd_args.ar_statfs_percent;
 503                 if (x >= y || x <= -y)
 504                         need_sync = 1;
 505         }
 506         spin_unlock(&sdp->sd_statfs_spin);
 507
 508         brelse(l_bh);
 509         if (need_sync)
 510                 gfs2_wake_up_statfs(sdp);
 511 }
 512
 513 void update_statfs(struct gfs2_sbd *sdp, struct buffer_head *m_bh,
 514                    struct buffer_head *l_bh)
 515 {
 516         struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
 517         struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
 518         struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
 519         struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
 520
 521         gfs2_trans_add_bh(l_ip->i_gl, l_bh, 1);
 522
 523         spin_lock(&sdp->sd_statfs_spin);
 524         m_sc->sc_total += l_sc->sc_total;
 525         m_sc->sc_free += l_sc->sc_free;
 526         m_sc->sc_dinodes += l_sc->sc_dinodes;
 527         memset(l_sc, 0, sizeof(struct gfs2_statfs_change));
 528         memset(l_bh->b_data + sizeof(struct gfs2_dinode),
 529                0, sizeof(struct gfs2_statfs_change));
 530         spin_unlock(&sdp->sd_statfs_spin);
 531
 532         gfs2_trans_add_bh(m_ip->i_gl, m_bh, 1);
 533         gfs2_statfs_change_out(m_sc, m_bh->b_data + sizeof(struct gfs2_dinode));
 534 }
 535
 536 int gfs2_statfs_sync(struct super_block *sb, int type)
 537 {
 538         struct gfs2_sbd *sdp = sb->s_fs_info;
 539         struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
 540         struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
 541         struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
 542         struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
 543         struct gfs2_holder gh;
 544         struct buffer_head *m_bh, *l_bh;
 545         int error;
 546
 547         error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE,
 548                                    &gh);
 549         if (error)
 550                 return error;
 551
 552         error = gfs2_meta_inode_buffer(m_ip, &m_bh);
 553         if (error)
 554                 goto out;
 555
 556         spin_lock(&sdp->sd_statfs_spin);
 557         gfs2_statfs_change_in(m_sc, m_bh->b_data +
 558                               sizeof(struct gfs2_dinode));
 559         if (!l_sc->sc_total && !l_sc->sc_free && !l_sc->sc_dinodes) {
 560                 spin_unlock(&sdp->sd_statfs_spin);
 561                 goto out_bh;
 562         }
 563         spin_unlock(&sdp->sd_statfs_spin);
 564
 565         error = gfs2_meta_inode_buffer(l_ip, &l_bh);
 566         if (error)
 567                 goto out_bh;
 568
 569         error = gfs2_trans_begin(sdp, 2 * RES_DINODE, 0);
 570         if (error)
 571                 goto out_bh2;
 572
 573         update_statfs(sdp, m_bh, l_bh);
 574         sdp->sd_statfs_force_sync = 0;
 575
 576         gfs2_trans_end(sdp);
 577
 578 out_bh2:
 579         brelse(l_bh);
 580 out_bh:
 581         brelse(m_bh);
 582 out:
 583         gfs2_glock_dq_uninit(&gh);
 584         return error;
 585 }
 586
 587 struct lfcc {
 588         struct list_head list;
 589         struct gfs2_holder gh;
 590 };
 591
 592 /**
 593  * gfs2_lock_fs_check_clean - Stop all writes to the FS and check that all
 594  *                            journals are clean
 595  * @sdp: the file system
 596  * @state: the state to put the transaction lock into
 597  * @t_gh: the hold on the transaction lock
 598  *
 599  * Returns: errno
 600  */
 601
 602 static int gfs2_lock_fs_check_clean(struct gfs2_sbd *sdp,
 603                                     struct gfs2_holder *t_gh)
 604 {
 605         struct gfs2_inode *ip;
 606         struct gfs2_jdesc *jd;
 607         struct lfcc *lfcc;
 608         LIST_HEAD(list);
 609         struct gfs2_log_header_host lh;
 610         int error;
 611
 612         list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
 613                 lfcc = kmalloc(sizeof(struct lfcc), GFP_KERNEL);
 614                 if (!lfcc) {
 615                         error = -ENOMEM;
 616                         goto out;
 617                 }
 618                 ip = GFS2_I(jd->jd_inode);
 619                 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &lfcc->gh);
 620                 if (error) {
 621                         kfree(lfcc);
 622                         goto out;
 623                 }
 624                 list_add(&lfcc->list, &list);
 625         }
 626
 627         error = gfs2_glock_nq_init(sdp->sd_trans_gl, LM_ST_DEFERRED,
 628                                    GL_NOCACHE, t_gh);
 629
 630         list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
 631                 error = gfs2_jdesc_check(jd);
 632                 if (error)
 633                         break;
 634                 error = gfs2_find_jhead(jd, &lh);
 635                 if (error)
 636                         break;
 637                 if (!(lh.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) {
 638                         error = -EBUSY;
 639                         break;
 640                 }
 641         }
 642
 643         if (error)
 644                 gfs2_glock_dq_uninit(t_gh);
 645
 646 out:
 647         while (!list_empty(&list)) {
 648                 lfcc = list_entry(list.next, struct lfcc, list);
 649                 list_del(&lfcc->list);
 650                 gfs2_glock_dq_uninit(&lfcc->gh);
 651                 kfree(lfcc);
 652         }
 653         return error;
 654 }
 655
 656 /**
 657  * gfs2_freeze_fs - freezes the file system
 658  * @sdp: the file system
 659  *
 660  * This function flushes data and meta data for all machines by
 661  * aquiring the transaction log exclusively.  All journals are
 662  * ensured to be in a clean state as well.
 663  *
 664  * Returns: errno
 665  */
 666
 667 int gfs2_freeze_fs(struct gfs2_sbd *sdp)
 668 {
 669         int error = 0;
 670
 671         mutex_lock(&sdp->sd_freeze_lock);
 672
 673         if (!sdp->sd_freeze_count++) {
 674                 error = gfs2_lock_fs_check_clean(sdp, &sdp->sd_freeze_gh);
 675                 if (error)
 676                         sdp->sd_freeze_count--;
 677         }
 678
 679         mutex_unlock(&sdp->sd_freeze_lock);
 680
 681         return error;
 682 }
 683
 684 /**
 685  * gfs2_unfreeze_fs - unfreezes the file system
 686  * @sdp: the file system
 687  *
 688  * This function allows the file system to proceed by unlocking
 689  * the exclusively held transaction lock.  Other GFS2 nodes are
 690  * now free to acquire the lock shared and go on with their lives.
 691  *
 692  */
 693
 694 void gfs2_unfreeze_fs(struct gfs2_sbd *sdp)
 695 {
 696         mutex_lock(&sdp->sd_freeze_lock);
 697
 698         if (sdp->sd_freeze_count && !--sdp->sd_freeze_count)
 699                 gfs2_glock_dq_uninit(&sdp->sd_freeze_gh);
 700
 701         mutex_unlock(&sdp->sd_freeze_lock);
 702 }
 703
 704
 705 /**
 706  * gfs2_write_inode - Make sure the inode is stable on the disk
 707  * @inode: The inode
 708  * @sync: synchronous write flag
 709  *
 710  * Returns: errno
 711  */
 712
 713 static int gfs2_write_inode(struct inode *inode, int sync)
 714 {
 715         struct gfs2_inode *ip = GFS2_I(inode);
 716         struct gfs2_sbd *sdp = GFS2_SB(inode);
 717         struct gfs2_holder gh;
 718         struct buffer_head *bh;
 719         struct timespec atime;
 720         struct gfs2_dinode *di;
 721         int ret = 0;
 722
 723         /* Check this is a "normal" inode, etc */
 724         if (!test_bit(GIF_USER, &ip->i_flags) ||
 725             (current->flags & PF_MEMALLOC))
 726                 return 0;
 727         ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
 728         if (ret)
 729                 goto do_flush;
 730         ret = gfs2_trans_begin(sdp, RES_DINODE, 0);
 731         if (ret)
 732                 goto do_unlock;
 733         ret = gfs2_meta_inode_buffer(ip, &bh);
 734         if (ret == 0) {
 735                 di = (struct gfs2_dinode *)bh->b_data;
 736                 atime.tv_sec = be64_to_cpu(di->di_atime);
 737                 atime.tv_nsec = be32_to_cpu(di->di_atime_nsec);
 738                 if (timespec_compare(&inode->i_atime, &atime) > 0) {
 739                         gfs2_trans_add_bh(ip->i_gl, bh, 1);
 740                         gfs2_dinode_out(ip, bh->b_data);
 741                 }
 742                 brelse(bh);
 743         }
 744         gfs2_trans_end(sdp);
 745 do_unlock:
 746         gfs2_glock_dq_uninit(&gh);
 747 do_flush:
 748         if (sync != 0)
 749                 gfs2_log_flush(GFS2_SB(inode), ip->i_gl);
 750         return ret;
 751 }
 752
 753 /**
 754  * gfs2_make_fs_ro - Turn a Read-Write FS into a Read-Only one
 755  * @sdp: the filesystem
 756  *
 757  * Returns: errno
 758  */
 759
 760 static int gfs2_make_fs_ro(struct gfs2_sbd *sdp)
 761 {
 762         struct gfs2_holder t_gh;
 763         int error;
 764
 765         flush_workqueue(gfs2_delete_workqueue);
 766         gfs2_quota_sync(sdp->sd_vfs, 0);
 767         gfs2_statfs_sync(sdp->sd_vfs, 0);
 768
 769         error = gfs2_glock_nq_init(sdp->sd_trans_gl, LM_ST_SHARED, GL_NOCACHE,
 770                                    &t_gh);
 771         if (error && !test_bit(SDF_SHUTDOWN, &sdp->sd_flags))
 772                 return error;
 773
 774         gfs2_meta_syncfs(sdp);
 775         gfs2_log_shutdown(sdp);
 776
 777         clear_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags);
 778
 779         if (t_gh.gh_gl)
 780                 gfs2_glock_dq_uninit(&t_gh);
 781
 782         gfs2_quota_cleanup(sdp);
 783
 784         return error;
 785 }
 786
 787 static int gfs2_umount_recovery_wait(void *word)
 788 {
 789         schedule();
 790         return 0;
 791 }
 792
 793 /**
 794  * gfs2_put_super - Unmount the filesystem
 795  * @sb: The VFS superblock
 796  *
 797  */
 798
 799 static void gfs2_put_super(struct super_block *sb)
 800 {
 801         struct gfs2_sbd *sdp = sb->s_fs_info;
 802         int error;
 803         struct gfs2_jdesc *jd;
 804
 805         /*  Unfreeze the filesystem, if we need to  */
 806
 807         mutex_lock(&sdp->sd_freeze_lock);
 808         if (sdp->sd_freeze_count)
 809                 gfs2_glock_dq_uninit(&sdp->sd_freeze_gh);
 810         mutex_unlock(&sdp->sd_freeze_lock);
 811
 812         /* No more recovery requests */
 813         set_bit(SDF_NORECOVERY, &sdp->sd_flags);
 814         smp_mb();
 815
 816         /* Wait on outstanding recovery */
 817 restart:
 818         spin_lock(&sdp->sd_jindex_spin);
 819         list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
 820                 if (!test_bit(JDF_RECOVERY, &jd->jd_flags))
 821                         continue;
 822                 spin_unlock(&sdp->sd_jindex_spin);
 823                 wait_on_bit(&jd->jd_flags, JDF_RECOVERY,
 824                             gfs2_umount_recovery_wait, TASK_UNINTERRUPTIBLE);
 825                 goto restart;
 826         }
 827         spin_unlock(&sdp->sd_jindex_spin);
 828
 829         kthread_stop(sdp->sd_quotad_process);
 830         kthread_stop(sdp->sd_logd_process);
 831
 832         if (!(sb->s_flags & MS_RDONLY)) {
 833                 error = gfs2_make_fs_ro(sdp);
 834                 if (error)
 835                         gfs2_io_error(sdp);
 836         }
 837         /*  At this point, we're through modifying the disk  */
 838
 839         /*  Release stuff  */
 840
 841         iput(sdp->sd_jindex);
 842         iput(sdp->sd_statfs_inode);
 843         iput(sdp->sd_rindex);
 844         iput(sdp->sd_quota_inode);
 845
 846         gfs2_glock_put(sdp->sd_rename_gl);
 847         gfs2_glock_put(sdp->sd_trans_gl);
 848
 849         if (!sdp->sd_args.ar_spectator) {
 850                 gfs2_glock_dq_uninit(&sdp->sd_journal_gh);
 851                 gfs2_glock_dq_uninit(&sdp->sd_jinode_gh);
 852                 gfs2_glock_dq_uninit(&sdp->sd_sc_gh);
 853                 gfs2_glock_dq_uninit(&sdp->sd_qc_gh);
 854                 iput(sdp->sd_sc_inode);
 855                 iput(sdp->sd_qc_inode);
 856         }
 857
 858         gfs2_glock_dq_uninit(&sdp->sd_live_gh);
 859         gfs2_clear_rgrpd(sdp);
 860         gfs2_jindex_free(sdp);
 861         /*  Take apart glock structures and buffer lists  */
 862         gfs2_gl_hash_clear(sdp);
 863         /*  Unmount the locking protocol  */
 864         gfs2_lm_unmount(sdp);
 865
 866         /*  At this point, we're through participating in the lockspace  */
 867         gfs2_sys_fs_del(sdp);
 868 }
 869
 870 /**
 871  * gfs2_sync_fs - sync the filesystem
 872  * @sb: the superblock
 873  *
 874  * Flushes the log to disk.
 875  */
 876
 877 static int gfs2_sync_fs(struct super_block *sb, int wait)
 878 {
 879         if (wait && sb->s_fs_info)
 880                 gfs2_log_flush(sb->s_fs_info, NULL);
 881         return 0;
 882 }
 883
 884 /**
 885  * gfs2_freeze - prevent further writes to the filesystem
 886  * @sb: the VFS structure for the filesystem
 887  *
 888  */
 889
 890 static int gfs2_freeze(struct super_block *sb)
 891 {
 892         struct gfs2_sbd *sdp = sb->s_fs_info;
 893         int error;
 894
 895         if (test_bit(SDF_SHUTDOWN, &sdp->sd_flags))
 896                 return -EINVAL;
 897
 898         for (;;) {
 899                 error = gfs2_freeze_fs(sdp);
 900                 if (!error)
 901                         break;
 902
 903                 switch (error) {
 904                 case -EBUSY:
 905                         fs_err(sdp, "waiting for recovery before freeze\n");
 906                         break;
 907
 908                 default:
 909                         fs_err(sdp, "error freezing FS: %d\n", error);
 910                         break;
 911                 }
 912
 913                 fs_err(sdp, "retrying...\n");
 914                 msleep(1000);
 915         }
 916         return 0;
 917 }
 918
 919 /**
 920  * gfs2_unfreeze - reallow writes to the filesystem
 921  * @sb: the VFS structure for the filesystem
 922  *
 923  */
 924
 925 static int gfs2_unfreeze(struct super_block *sb)
 926 {
 927         gfs2_unfreeze_fs(sb->s_fs_info);
 928         return 0;
 929 }
 930
 931 /**
 932  * statfs_fill - fill in the sg for a given RG
 933  * @rgd: the RG
 934  * @sc: the sc structure
 935  *
 936  * Returns: 0 on success, -ESTALE if the LVB is invalid
 937  */
 938
 939 static int statfs_slow_fill(struct gfs2_rgrpd *rgd,
 940                             struct gfs2_statfs_change_host *sc)
 941 {
 942         gfs2_rgrp_verify(rgd);
 943         sc->sc_total += rgd->rd_data;
 944         sc->sc_free += rgd->rd_free;
 945         sc->sc_dinodes += rgd->rd_dinodes;
 946         return 0;
 947 }
 948
 949 /**
 950  * gfs2_statfs_slow - Stat a filesystem using asynchronous locking
 951  * @sdp: the filesystem
 952  * @sc: the sc info that will be returned
 953  *
 954  * Any error (other than a signal) will cause this routine to fall back
 955  * to the synchronous version.
 956  *
 957  * FIXME: This really shouldn't busy wait like this.
 958  *
 959  * Returns: errno
 960  */
 961
 962 static int gfs2_statfs_slow(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *sc)
 963 {
 964         struct gfs2_holder ri_gh;
 965         struct gfs2_rgrpd *rgd_next;
 966         struct gfs2_holder *gha, *gh;
 967         unsigned int slots = 64;
 968         unsigned int x;
 969         int done;
 970         int error = 0, err;
 971
 972         memset(sc, 0, sizeof(struct gfs2_statfs_change_host));
 973         gha = kcalloc(slots, sizeof(struct gfs2_holder), GFP_KERNEL);
 974         if (!gha)
 975                 return -ENOMEM;
 976
 977         error = gfs2_rindex_hold(sdp, &ri_gh);
 978         if (error)
 979                 goto out;
 980
 981         rgd_next = gfs2_rgrpd_get_first(sdp);
 982
 983         for (;;) {
 984                 done = 1;
 985
 986                 for (x = 0; x < slots; x++) {
 987                         gh = gha + x;
 988
 989                         if (gh->gh_gl && gfs2_glock_poll(gh)) {
 990                                 err = gfs2_glock_wait(gh);
 991                                 if (err) {
 992                                         gfs2_holder_uninit(gh);
 993                                         error = err;
 994                                 } else {
 995                                         if (!error)
 996                                                 error = statfs_slow_fill(
 997                                                         gh->gh_gl->gl_object, sc);
 998                                         gfs2_glock_dq_uninit(gh);
 999                                 }
1000                         }
1001
1002                         if (gh->gh_gl)
1003                                 done = 0;
1004                         else if (rgd_next && !error) {
1005                                 error = gfs2_glock_nq_init(rgd_next->rd_gl,
1006                                                            LM_ST_SHARED,
1007                                                            GL_ASYNC,
1008                                                            gh);
1009                                 rgd_next = gfs2_rgrpd_get_next(rgd_next);
1010                                 done = 0;
1011                         }
1012
1013                         if (signal_pending(current))
1014                                 error = -ERESTARTSYS;
1015                 }
1016
1017                 if (done)
1018                         break;
1019
1020                 yield();
1021         }
1022
1023         gfs2_glock_dq_uninit(&ri_gh);
1024
1025 out:
1026         kfree(gha);
1027         return error;
1028 }
1029
1030 /**
1031  * gfs2_statfs_i - Do a statfs
1032  * @sdp: the filesystem
1033  * @sg: the sg structure
1034  *
1035  * Returns: errno
1036  */
1037
1038 static int gfs2_statfs_i(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *sc)
1039 {
1040         struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
1041         struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
1042
1043         spin_lock(&sdp->sd_statfs_spin);
1044
1045         *sc = *m_sc;
1046         sc->sc_total += l_sc->sc_total;
1047         sc->sc_free += l_sc->sc_free;
1048         sc->sc_dinodes += l_sc->sc_dinodes;
1049
1050         spin_unlock(&sdp->sd_statfs_spin);
1051
1052         if (sc->sc_free < 0)
1053                 sc->sc_free = 0;
1054         if (sc->sc_free > sc->sc_total)
1055                 sc->sc_free = sc->sc_total;
1056         if (sc->sc_dinodes < 0)
1057                 sc->sc_dinodes = 0;
1058
1059         return 0;
1060 }
1061
1062 /**
1063  * gfs2_statfs - Gather and return stats about the filesystem
1064  * @sb: The superblock
1065  * @statfsbuf: The buffer
1066  *
1067  * Returns: 0 on success or error code
1068  */
1069
1070 static int gfs2_statfs(struct dentry *dentry, struct kstatfs *buf)
1071 {
1072         struct super_block *sb = dentry->d_inode->i_sb;
1073         struct gfs2_sbd *sdp = sb->s_fs_info;
1074         struct gfs2_statfs_change_host sc;
1075         int error;
1076
1077         if (gfs2_tune_get(sdp, gt_statfs_slow))
1078                 error = gfs2_statfs_slow(sdp, &sc);
1079         else
1080                 error = gfs2_statfs_i(sdp, &sc);
1081
1082         if (error)
1083                 return error;
1084
1085         buf->f_type = GFS2_MAGIC;
1086         buf->f_bsize = sdp->sd_sb.sb_bsize;
1087         buf->f_blocks = sc.sc_total;
1088         buf->f_bfree = sc.sc_free;
1089         buf->f_bavail = sc.sc_free;
1090         buf->f_files = sc.sc_dinodes + sc.sc_free;
1091         buf->f_ffree = sc.sc_free;
1092         buf->f_namelen = GFS2_FNAMESIZE;
1093
1094         return 0;
1095 }
1096
1097 /**
1098  * gfs2_remount_fs - called when the FS is remounted
1099  * @sb:  the filesystem
1100  * @flags:  the remount flags
1101  * @data:  extra data passed in (not used right now)
1102  *
1103  * Returns: errno
1104  */
1105
1106 static int gfs2_remount_fs(struct super_block *sb, int *flags, char *data)
1107 {
1108         struct gfs2_sbd *sdp = sb->s_fs_info;
1109         struct gfs2_args args = sdp->sd_args; /* Default to current settings */
1110         struct gfs2_tune *gt = &sdp->sd_tune;
1111         int error;
1112
1113         spin_lock(&gt->gt_spin);
1114         args.ar_commit = gt->gt_log_flush_secs;
1115         args.ar_quota_quantum = gt->gt_quota_quantum;
1116         if (gt->gt_statfs_slow)
1117                 args.ar_statfs_quantum = 0;
1118         else
1119                 args.ar_statfs_quantum = gt->gt_statfs_quantum;
1120         spin_unlock(&gt->gt_spin);
1121         error = gfs2_mount_args(&args, data);
1122         if (error)
1123                 return error;
1124
1125         /* Not allowed to change locking details */
1126         if (strcmp(args.ar_lockproto, sdp->sd_args.ar_lockproto) ||
1127             strcmp(args.ar_locktable, sdp->sd_args.ar_locktable) ||
1128             strcmp(args.ar_hostdata, sdp->sd_args.ar_hostdata))
1129                 return -EINVAL;
1130
1131         /* Some flags must not be changed */
1132         if (args_neq(&args, &sdp->sd_args, spectator) ||
1133             args_neq(&args, &sdp->sd_args, ignore_local_fs) ||
1134             args_neq(&args, &sdp->sd_args, localflocks) ||
1135             args_neq(&args, &sdp->sd_args, localcaching) ||
1136             args_neq(&args, &sdp->sd_args, meta))
1137                 return -EINVAL;
1138
1139         if (sdp->sd_args.ar_spectator)
1140                 *flags |= MS_RDONLY;
1141
1142         if ((sb->s_flags ^ *flags) & MS_RDONLY) {
1143                 if (*flags & MS_RDONLY)
1144                         error = gfs2_make_fs_ro(sdp);
1145                 else
1146                         error = gfs2_make_fs_rw(sdp);
1147                 if (error)
1148                         return error;
1149         }
1150
1151         sdp->sd_args = args;
1152         if (sdp->sd_args.ar_posix_acl)
1153                 sb->s_flags |= MS_POSIXACL;
1154         else
1155                 sb->s_flags &= ~MS_POSIXACL;
1156         if (sdp->sd_args.ar_nobarrier)
1157                 set_bit(SDF_NOBARRIERS, &sdp->sd_flags);
1158         else
1159                 clear_bit(SDF_NOBARRIERS, &sdp->sd_flags);
1160         spin_lock(&gt->gt_spin);
1161         gt->gt_log_flush_secs = args.ar_commit;
1162         gt->gt_quota_quantum = args.ar_quota_quantum;
1163         if (args.ar_statfs_quantum) {
1164                 gt->gt_statfs_slow = 0;
1165                 gt->gt_statfs_quantum = args.ar_statfs_quantum;
1166         }
1167         else {
1168                 gt->gt_statfs_slow = 1;
1169                 gt->gt_statfs_quantum = 30;
1170         }
1171         spin_unlock(&gt->gt_spin);
1172
1173         gfs2_online_uevent(sdp);
1174         return 0;
1175 }
1176
1177 /**
1178  * gfs2_drop_inode - Drop an inode (test for remote unlink)
1179  * @inode: The inode to drop
1180  *
1181  * If we've received a callback on an iopen lock then its because a
1182  * remote node tried to deallocate the inode but failed due to this node
1183  * still having the inode open. Here we mark the link count zero
1184  * since we know that it must have reached zero if the GLF_DEMOTE flag
1185  * is set on the iopen glock. If we didn't do a disk read since the
1186  * remote node removed the final link then we might otherwise miss
1187  * this event. This check ensures that this node will deallocate the
1188  * inode's blocks, or alternatively pass the baton on to another
1189  * node for later deallocation.
1190  */
1191
1192 static void gfs2_drop_inode(struct inode *inode)
1193 {
1194         struct gfs2_inode *ip = GFS2_I(inode);
1195
1196         if (test_bit(GIF_USER, &ip->i_flags) && inode->i_nlink) {
1197                 struct gfs2_glock *gl = ip->i_iopen_gh.gh_gl;
1198                 if (gl && test_bit(GLF_DEMOTE, &gl->gl_flags))
1199                         clear_nlink(inode);
1200         }
1201         generic_drop_inode(inode);
1202 }
1203
1204 /**
1205  * gfs2_clear_inode - Deallocate an inode when VFS is done with it
1206  * @inode: The VFS inode
1207  *
1208  */
1209
1210 static void gfs2_clear_inode(struct inode *inode)
1211 {
1212         struct gfs2_inode *ip = GFS2_I(inode);
1213
1214         /* This tells us its a "real" inode and not one which only
1215          * serves to contain an address space (see rgrp.c, meta_io.c)
1216          * which therefore doesn't have its own glocks.
1217          */
1218         if (test_bit(GIF_USER, &ip->i_flags)) {
1219                 ip->i_gl->gl_object = NULL;
1220                 gfs2_glock_put(ip->i_gl);
1221                 ip->i_gl = NULL;
1222                 if (ip->i_iopen_gh.gh_gl) {
1223                         ip->i_iopen_gh.gh_gl->gl_object = NULL;
1224                         gfs2_glock_dq_uninit(&ip->i_iopen_gh);
1225                 }
1226         }
1227 }
1228
1229 static int is_ancestor(const struct dentry *d1, const struct dentry *d2)
1230 {
1231         do {
1232                 if (d1 == d2)
1233                         return 1;
1234                 d1 = d1->d_parent;
1235         } while (!IS_ROOT(d1));
1236         return 0;
1237 }
1238
1239 /**
1240  * gfs2_show_options - Show mount options for /proc/mounts
1241  * @s: seq_file structure
1242  * @mnt: vfsmount
1243  *
1244  * Returns: 0 on success or error code
1245  */
1246
1247 static int gfs2_show_options(struct seq_file *s, struct vfsmount *mnt)
1248 {
1249         struct gfs2_sbd *sdp = mnt->mnt_sb->s_fs_info;
1250         struct gfs2_args *args = &sdp->sd_args;
1251         int val;
1252
1253         if (is_ancestor(mnt->mnt_root, sdp->sd_master_dir))
1254                 seq_printf(s, ",meta");
1255         if (args->ar_lockproto[0])
1256                 seq_printf(s, ",lockproto=%s", args->ar_lockproto);
1257         if (args->ar_locktable[0])
1258                 seq_printf(s, ",locktable=%s", args->ar_locktable);
1259         if (args->ar_hostdata[0])
1260                 seq_printf(s, ",hostdata=%s", args->ar_hostdata);
1261         if (args->ar_spectator)
1262                 seq_printf(s, ",spectator");
1263         if (args->ar_ignore_local_fs)
1264                 seq_printf(s, ",ignore_local_fs");
1265         if (args->ar_localflocks)
1266                 seq_printf(s, ",localflocks");
1267         if (args->ar_localcaching)
1268                 seq_printf(s, ",localcaching");
1269         if (args->ar_debug)
1270                 seq_printf(s, ",debug");
1271         if (args->ar_upgrade)
1272                 seq_printf(s, ",upgrade");
1273         if (args->ar_posix_acl)
1274                 seq_printf(s, ",acl");
1275         if (args->ar_quota != GFS2_QUOTA_DEFAULT) {
1276                 char *state;
1277                 switch (args->ar_quota) {
1278                 case GFS2_QUOTA_OFF:
1279                         state = "off";
1280                         break;
1281                 case GFS2_QUOTA_ACCOUNT:
1282                         state = "account";
1283                         break;
1284                 case GFS2_QUOTA_ON:
1285                         state = "on";
1286                         break;
1287                 default:
1288                         state = "unknown";
1289                         break;
1290                 }
1291                 seq_printf(s, ",quota=%s", state);
1292         }
1293         if (args->ar_suiddir)
1294                 seq_printf(s, ",suiddir");
1295         if (args->ar_data != GFS2_DATA_DEFAULT) {
1296                 char *state;
1297                 switch (args->ar_data) {
1298                 case GFS2_DATA_WRITEBACK:
1299                         state = "writeback";
1300                         break;
1301                 case GFS2_DATA_ORDERED:
1302                         state = "ordered";
1303                         break;
1304                 default:
1305                         state = "unknown";
1306                         break;
1307                 }
1308                 seq_printf(s, ",data=%s", state);
1309         }
1310         if (args->ar_discard)
1311                 seq_printf(s, ",discard");
1312         val = sdp->sd_tune.gt_log_flush_secs;
1313         if (val != 60)
1314                 seq_printf(s, ",commit=%d", val);
1315         val = sdp->sd_tune.gt_statfs_quantum;
1316         if (val != 30)
1317                 seq_printf(s, ",statfs_quantum=%d", val);
1318         val = sdp->sd_tune.gt_quota_quantum;
1319         if (val != 60)
1320                 seq_printf(s, ",quota_quantum=%d", val);
1321         if (args->ar_statfs_percent)
1322                 seq_printf(s, ",statfs_percent=%d", args->ar_statfs_percent);
1323         if (args->ar_errors != GFS2_ERRORS_DEFAULT) {
1324                 const char *state;
1325
1326                 switch (args->ar_errors) {
1327                 case GFS2_ERRORS_WITHDRAW:
1328                         state = "withdraw";
1329                         break;
1330                 case GFS2_ERRORS_PANIC:
1331                         state = "panic";
1332                         break;
1333                 default:
1334                         state = "unknown";
1335                         break;
1336                 }
1337                 seq_printf(s, ",errors=%s", state);
1338         }
1339         if (test_bit(SDF_NOBARRIERS, &sdp->sd_flags))
1340                 seq_printf(s, ",nobarrier");
1341
1342         return 0;
1343 }
1344
1345 /*
1346  * We have to (at the moment) hold the inodes main lock to cover
1347  * the gap between unlocking the shared lock on the iopen lock and
1348  * taking the exclusive lock. I'd rather do a shared -> exclusive
1349  * conversion on the iopen lock, but we can change that later. This
1350  * is safe, just less efficient.
1351  */
1352
1353 static void gfs2_delete_inode(struct inode *inode)
1354 {
1355         struct gfs2_sbd *sdp = inode->i_sb->s_fs_info;
1356         struct gfs2_inode *ip = GFS2_I(inode);
1357         struct gfs2_holder gh;
1358         int error;
1359
1360         if (!test_bit(GIF_USER, &ip->i_flags))
1361                 goto out;
1362
1363         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
1364         if (unlikely(error)) {
1365                 gfs2_glock_dq_uninit(&ip->i_iopen_gh);
1366                 goto out;
1367         }
1368
1369         error = gfs2_check_blk_type(sdp, ip->i_no_addr, GFS2_BLKST_UNLINKED);
1370         if (error)
1371                 goto out_truncate;
1372
1373         gfs2_glock_dq_wait(&ip->i_iopen_gh);
1374         gfs2_holder_reinit(LM_ST_EXCLUSIVE, LM_FLAG_TRY_1CB | GL_NOCACHE, &ip->i_iopen_gh);
1375         error = gfs2_glock_nq(&ip->i_iopen_gh);
1376         if (error)
1377                 goto out_truncate;
1378
1379         if (S_ISDIR(inode->i_mode) &&
1380             (ip->i_diskflags & GFS2_DIF_EXHASH)) {
1381                 error = gfs2_dir_exhash_dealloc(ip);
1382                 if (error)
1383                         goto out_unlock;
1384         }
1385
1386         if (ip->i_eattr) {
1387                 error = gfs2_ea_dealloc(ip);
1388                 if (error)
1389                         goto out_unlock;
1390         }
1391
1392         if (!gfs2_is_stuffed(ip)) {
1393                 error = gfs2_file_dealloc(ip);
1394                 if (error)
1395                         goto out_unlock;
1396         }
1397
1398         error = gfs2_dinode_dealloc(ip);
1399         if (error)
1400                 goto out_unlock;
1401
1402 out_truncate:
1403         error = gfs2_trans_begin(sdp, 0, sdp->sd_jdesc->jd_blocks);
1404         if (error)
1405                 goto out_unlock;
1406         /* Needs to be done before glock release & also in a transaction */
1407         truncate_inode_pages(&inode->i_data, 0);
1408         gfs2_trans_end(sdp);
1409
1410 out_unlock:
1411         if (test_bit(HIF_HOLDER, &ip->i_iopen_gh.gh_iflags))
1412                 gfs2_glock_dq(&ip->i_iopen_gh);
1413         gfs2_holder_uninit(&ip->i_iopen_gh);
1414         gfs2_glock_dq_uninit(&gh);
1415         if (error && error != GLR_TRYFAILED && error != -EROFS)
1416                 fs_warn(sdp, "gfs2_delete_inode: %d\n", error);
1417 out:
1418         truncate_inode_pages(&inode->i_data, 0);
1419         clear_inode(inode);
1420 }
1421
1422 static struct inode *gfs2_alloc_inode(struct super_block *sb)
1423 {
1424         struct gfs2_inode *ip;
1425
1426         ip = kmem_cache_alloc(gfs2_inode_cachep, GFP_KERNEL);
1427         if (ip) {
1428                 ip->i_flags = 0;
1429                 ip->i_gl = NULL;
1430         }
1431         return &ip->i_inode;
1432 }
1433
1434 static void gfs2_destroy_inode(struct inode *inode)
1435 {
1436         kmem_cache_free(gfs2_inode_cachep, inode);
1437 }
1438
1439 const struct super_operations gfs2_super_ops = {
1440         .alloc_inode            = gfs2_alloc_inode,
1441         .destroy_inode          = gfs2_destroy_inode,
1442         .write_inode            = gfs2_write_inode,
1443         .delete_inode           = gfs2_delete_inode,
1444         .put_super              = gfs2_put_super,
1445         .sync_fs                = gfs2_sync_fs,
1446         .freeze_fs              = gfs2_freeze,
1447         .unfreeze_fs            = gfs2_unfreeze,
1448         .statfs                 = gfs2_statfs,
1449         .remount_fs             = gfs2_remount_fs,
1450         .clear_inode            = gfs2_clear_inode,
1451         .drop_inode             = gfs2_drop_inode,
1452         .show_options           = gfs2_show_options,
1453 };
1454