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 #include <linux/backing-dev.h>
  27
  28 #include "gfs2.h"
  29 #include "incore.h"
  30 #include "bmap.h"
  31 #include "dir.h"
  32 #include "glock.h"
  33 #include "glops.h"
  34 #include "inode.h"
  35 #include "log.h"
  36 #include "meta_io.h"
  37 #include "quota.h"
  38 #include "recovery.h"
  39 #include "rgrp.h"
  40 #include "super.h"
  41 #include "trans.h"
  42 #include "util.h"
  43 #include "sys.h"
  44 #include "xattr.h"
  45
  46 #define args_neq(a1, a2, x) ((a1)->ar_##x != (a2)->ar_##x)
  47
  48 enum {
  49         Opt_lockproto,
  50         Opt_locktable,
  51         Opt_hostdata,
  52         Opt_spectator,
  53         Opt_ignore_local_fs,
  54         Opt_localflocks,
  55         Opt_localcaching,
  56         Opt_debug,
  57         Opt_nodebug,
  58         Opt_upgrade,
  59         Opt_acl,
  60         Opt_noacl,
  61         Opt_quota_off,
  62         Opt_quota_account,
  63         Opt_quota_on,
  64         Opt_quota,
  65         Opt_noquota,
  66         Opt_suiddir,
  67         Opt_nosuiddir,
  68         Opt_data_writeback,
  69         Opt_data_ordered,
  70         Opt_meta,
  71         Opt_discard,
  72         Opt_nodiscard,
  73         Opt_commit,
  74         Opt_err_withdraw,
  75         Opt_err_panic,
  76         Opt_statfs_quantum,
  77         Opt_statfs_percent,
  78         Opt_quota_quantum,
  79         Opt_barrier,
  80         Opt_nobarrier,
  81         Opt_rgrplvb,
  82         Opt_norgrplvb,
  83         Opt_error,
  84 };
  85
  86 static const match_table_t tokens = {
  87         {Opt_lockproto, "lockproto=%s"},
  88         {Opt_locktable, "locktable=%s"},
  89         {Opt_hostdata, "hostdata=%s"},
  90         {Opt_spectator, "spectator"},
  91         {Opt_spectator, "norecovery"},
  92         {Opt_ignore_local_fs, "ignore_local_fs"},
  93         {Opt_localflocks, "localflocks"},
  94         {Opt_localcaching, "localcaching"},
  95         {Opt_debug, "debug"},
  96         {Opt_nodebug, "nodebug"},
  97         {Opt_upgrade, "upgrade"},
  98         {Opt_acl, "acl"},
  99         {Opt_noacl, "noacl"},
 100         {Opt_quota_off, "quota=off"},
 101         {Opt_quota_account, "quota=account"},
 102         {Opt_quota_on, "quota=on"},
 103         {Opt_quota, "quota"},
 104         {Opt_noquota, "noquota"},
 105         {Opt_suiddir, "suiddir"},
 106         {Opt_nosuiddir, "nosuiddir"},
 107         {Opt_data_writeback, "data=writeback"},
 108         {Opt_data_ordered, "data=ordered"},
 109         {Opt_meta, "meta"},
 110         {Opt_discard, "discard"},
 111         {Opt_nodiscard, "nodiscard"},
 112         {Opt_commit, "commit=%d"},
 113         {Opt_err_withdraw, "errors=withdraw"},
 114         {Opt_err_panic, "errors=panic"},
 115         {Opt_statfs_quantum, "statfs_quantum=%d"},
 116         {Opt_statfs_percent, "statfs_percent=%d"},
 117         {Opt_quota_quantum, "quota_quantum=%d"},
 118         {Opt_barrier, "barrier"},
 119         {Opt_nobarrier, "nobarrier"},
 120         {Opt_rgrplvb, "rgrplvb"},
 121         {Opt_norgrplvb, "norgrplvb"},
 122         {Opt_error, NULL}
 123 };
 124
 125 /**
 126  * gfs2_mount_args - Parse mount options
 127  * @args: The structure into which the parsed options will be written
 128  * @options: The options to parse
 129  *
 130  * Return: errno
 131  */
 132
 133 int gfs2_mount_args(struct gfs2_args *args, char *options)
 134 {
 135         char *o;
 136         int token;
 137         substring_t tmp[MAX_OPT_ARGS];
 138         int rv;
 139
 140         /* Split the options into tokens with the "," character and
 141            process them */
 142
 143         while (1) {
 144                 o = strsep(&options, ",");
 145                 if (o == NULL)
 146                         break;
 147                 if (*o == '\0')
 148                         continue;
 149
 150                 token = match_token(o, tokens, tmp);
 151                 switch (token) {
 152                 case Opt_lockproto:
 153                         match_strlcpy(args->ar_lockproto, &tmp[0],
 154                                       GFS2_LOCKNAME_LEN);
 155                         break;
 156                 case Opt_locktable:
 157                         match_strlcpy(args->ar_locktable, &tmp[0],
 158                                       GFS2_LOCKNAME_LEN);
 159                         break;
 160                 case Opt_hostdata:
 161                         match_strlcpy(args->ar_hostdata, &tmp[0],
 162                                       GFS2_LOCKNAME_LEN);
 163                         break;
 164                 case Opt_spectator:
 165                         args->ar_spectator = 1;
 166                         break;
 167                 case Opt_ignore_local_fs:
 168                         /* Retained for backwards compat only */
 169                         break;
 170                 case Opt_localflocks:
 171                         args->ar_localflocks = 1;
 172                         break;
 173                 case Opt_localcaching:
 174                         /* Retained for backwards compat only */
 175                         break;
 176                 case Opt_debug:
 177                         if (args->ar_errors == GFS2_ERRORS_PANIC) {
 178                                 printk(KERN_WARNING "GFS2: -o debug and -o errors=panic "
 179                                        "are mutually exclusive.\n");
 180                                 return -EINVAL;
 181                         }
 182                         args->ar_debug = 1;
 183                         break;
 184                 case Opt_nodebug:
 185                         args->ar_debug = 0;
 186                         break;
 187                 case Opt_upgrade:
 188                         /* Retained for backwards compat only */
 189                         break;
 190                 case Opt_acl:
 191                         args->ar_posix_acl = 1;
 192                         break;
 193                 case Opt_noacl:
 194                         args->ar_posix_acl = 0;
 195                         break;
 196                 case Opt_quota_off:
 197                 case Opt_noquota:
 198                         args->ar_quota = GFS2_QUOTA_OFF;
 199                         break;
 200                 case Opt_quota_account:
 201                         args->ar_quota = GFS2_QUOTA_ACCOUNT;
 202                         break;
 203                 case Opt_quota_on:
 204                 case Opt_quota:
 205                         args->ar_quota = GFS2_QUOTA_ON;
 206                         break;
 207                 case Opt_suiddir:
 208                         args->ar_suiddir = 1;
 209                         break;
 210                 case Opt_nosuiddir:
 211                         args->ar_suiddir = 0;
 212                         break;
 213                 case Opt_data_writeback:
 214                         args->ar_data = GFS2_DATA_WRITEBACK;
 215                         break;
 216                 case Opt_data_ordered:
 217                         args->ar_data = GFS2_DATA_ORDERED;
 218                         break;
 219                 case Opt_meta:
 220                         args->ar_meta = 1;
 221                         break;
 222                 case Opt_discard:
 223                         args->ar_discard = 1;
 224                         break;
 225                 case Opt_nodiscard:
 226                         args->ar_discard = 0;
 227                         break;
 228                 case Opt_commit:
 229                         rv = match_int(&tmp[0], &args->ar_commit);
 230                         if (rv || args->ar_commit <= 0) {
 231                                 printk(KERN_WARNING "GFS2: commit mount option requires a positive numeric argument\n");
 232                                 return rv ? rv : -EINVAL;
 233                         }
 234                         break;
 235                 case Opt_statfs_quantum:
 236                         rv = match_int(&tmp[0], &args->ar_statfs_quantum);
 237                         if (rv || args->ar_statfs_quantum < 0) {
 238                                 printk(KERN_WARNING "GFS2: statfs_quantum mount option requires a non-negative numeric argument\n");
 239                                 return rv ? rv : -EINVAL;
 240                         }
 241                         break;
 242                 case Opt_quota_quantum:
 243                         rv = match_int(&tmp[0], &args->ar_quota_quantum);
 244                         if (rv || args->ar_quota_quantum <= 0) {
 245                                 printk(KERN_WARNING "GFS2: quota_quantum mount option requires a positive numeric argument\n");
 246                                 return rv ? rv : -EINVAL;
 247                         }
 248                         break;
 249                 case Opt_statfs_percent:
 250                         rv = match_int(&tmp[0], &args->ar_statfs_percent);
 251                         if (rv || args->ar_statfs_percent < 0 ||
 252                             args->ar_statfs_percent > 100) {
 253                                 printk(KERN_WARNING "statfs_percent mount option requires a numeric argument between 0 and 100\n");
 254                                 return rv ? rv : -EINVAL;
 255                         }
 256                         break;
 257                 case Opt_err_withdraw:
 258                         args->ar_errors = GFS2_ERRORS_WITHDRAW;
 259                         break;
 260                 case Opt_err_panic:
 261                         if (args->ar_debug) {
 262                                 printk(KERN_WARNING "GFS2: -o debug and -o errors=panic "
 263                                         "are mutually exclusive.\n");
 264                                 return -EINVAL;
 265                         }
 266                         args->ar_errors = GFS2_ERRORS_PANIC;
 267                         break;
 268                 case Opt_barrier:
 269                         args->ar_nobarrier = 0;
 270                         break;
 271                 case Opt_nobarrier:
 272                         args->ar_nobarrier = 1;
 273                         break;
 274                 case Opt_rgrplvb:
 275                         args->ar_rgrplvb = 1;
 276                         break;
 277                 case Opt_norgrplvb:
 278                         args->ar_rgrplvb = 0;
 279                         break;
 280                 case Opt_error:
 281                 default:
 282                         printk(KERN_WARNING "GFS2: invalid mount option: %s\n", o);
 283                         return -EINVAL;
 284                 }
 285         }
 286
 287         return 0;
 288 }
 289
 290 /**
 291  * gfs2_jindex_free - Clear all the journal index information
 292  * @sdp: The GFS2 superblock
 293  *
 294  */
 295
 296 void gfs2_jindex_free(struct gfs2_sbd *sdp)
 297 {
 298         struct list_head list, *head;
 299         struct gfs2_jdesc *jd;
 300         struct gfs2_journal_extent *jext;
 301
 302         spin_lock(&sdp->sd_jindex_spin);
 303         list_add(&list, &sdp->sd_jindex_list);
 304         list_del_init(&sdp->sd_jindex_list);
 305         sdp->sd_journals = 0;
 306         spin_unlock(&sdp->sd_jindex_spin);
 307
 308         while (!list_empty(&list)) {
 309                 jd = list_entry(list.next, struct gfs2_jdesc, jd_list);
 310                 head = &jd->extent_list;
 311                 while (!list_empty(head)) {
 312                         jext = list_entry(head->next,
 313                                           struct gfs2_journal_extent,
 314                                           extent_list);
 315                         list_del(&jext->extent_list);
 316                         kfree(jext);
 317                 }
 318                 list_del(&jd->jd_list);
 319                 iput(jd->jd_inode);
 320                 kfree(jd);
 321         }
 322 }
 323
 324 static struct gfs2_jdesc *jdesc_find_i(struct list_head *head, unsigned int jid)
 325 {
 326         struct gfs2_jdesc *jd;
 327         int found = 0;
 328
 329         list_for_each_entry(jd, head, jd_list) {
 330                 if (jd->jd_jid == jid) {
 331                         found = 1;
 332                         break;
 333                 }
 334         }
 335
 336         if (!found)
 337                 jd = NULL;
 338
 339         return jd;
 340 }
 341
 342 struct gfs2_jdesc *gfs2_jdesc_find(struct gfs2_sbd *sdp, unsigned int jid)
 343 {
 344         struct gfs2_jdesc *jd;
 345
 346         spin_lock(&sdp->sd_jindex_spin);
 347         jd = jdesc_find_i(&sdp->sd_jindex_list, jid);
 348         spin_unlock(&sdp->sd_jindex_spin);
 349
 350         return jd;
 351 }
 352
 353 int gfs2_jdesc_check(struct gfs2_jdesc *jd)
 354 {
 355         struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
 356         struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
 357         u64 size = i_size_read(jd->jd_inode);
 358
 359         if (gfs2_check_internal_file_size(jd->jd_inode, 8 << 20, 1 << 30))
 360                 return -EIO;
 361
 362         jd->jd_blocks = size >> sdp->sd_sb.sb_bsize_shift;
 363
 364         if (gfs2_write_alloc_required(ip, 0, size)) {
 365                 gfs2_consist_inode(ip);
 366                 return -EIO;
 367         }
 368
 369         return 0;
 370 }
 371
 372 /**
 373  * gfs2_make_fs_rw - Turn a Read-Only FS into a Read-Write one
 374  * @sdp: the filesystem
 375  *
 376  * Returns: errno
 377  */
 378
 379 int gfs2_make_fs_rw(struct gfs2_sbd *sdp)
 380 {
 381         struct gfs2_inode *ip = GFS2_I(sdp->sd_jdesc->jd_inode);
 382         struct gfs2_glock *j_gl = ip->i_gl;
 383         struct gfs2_holder t_gh;
 384         struct gfs2_log_header_host head;
 385         int error;
 386
 387         error = gfs2_glock_nq_init(sdp->sd_trans_gl, LM_ST_SHARED, 0, &t_gh);
 388         if (error)
 389                 return error;
 390
 391         j_gl->gl_ops->go_inval(j_gl, DIO_METADATA);
 392
 393         error = gfs2_find_jhead(sdp->sd_jdesc, &head);
 394         if (error)
 395                 goto fail;
 396
 397         if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) {
 398                 gfs2_consist(sdp);
 399                 error = -EIO;
 400                 goto fail;
 401         }
 402
 403         /*  Initialize some head of the log stuff  */
 404         sdp->sd_log_sequence = head.lh_sequence + 1;
 405         gfs2_log_pointers_init(sdp, head.lh_blkno);
 406
 407         error = gfs2_quota_init(sdp);
 408         if (error)
 409                 goto fail;
 410
 411         set_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags);
 412
 413         gfs2_glock_dq_uninit(&t_gh);
 414
 415         return 0;
 416
 417 fail:
 418         t_gh.gh_flags |= GL_NOCACHE;
 419         gfs2_glock_dq_uninit(&t_gh);
 420
 421         return error;
 422 }
 423
 424 void gfs2_statfs_change_in(struct gfs2_statfs_change_host *sc, const void *buf)
 425 {
 426         const struct gfs2_statfs_change *str = buf;
 427
 428         sc->sc_total = be64_to_cpu(str->sc_total);
 429         sc->sc_free = be64_to_cpu(str->sc_free);
 430         sc->sc_dinodes = be64_to_cpu(str->sc_dinodes);
 431 }
 432
 433 static void gfs2_statfs_change_out(const struct gfs2_statfs_change_host *sc, void *buf)
 434 {
 435         struct gfs2_statfs_change *str = buf;
 436
 437         str->sc_total = cpu_to_be64(sc->sc_total);
 438         str->sc_free = cpu_to_be64(sc->sc_free);
 439         str->sc_dinodes = cpu_to_be64(sc->sc_dinodes);
 440 }
 441
 442 int gfs2_statfs_init(struct gfs2_sbd *sdp)
 443 {
 444         struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
 445         struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
 446         struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
 447         struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
 448         struct buffer_head *m_bh, *l_bh;
 449         struct gfs2_holder gh;
 450         int error;
 451
 452         error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE,
 453                                    &gh);
 454         if (error)
 455                 return error;
 456
 457         error = gfs2_meta_inode_buffer(m_ip, &m_bh);
 458         if (error)
 459                 goto out;
 460
 461         if (sdp->sd_args.ar_spectator) {
 462                 spin_lock(&sdp->sd_statfs_spin);
 463                 gfs2_statfs_change_in(m_sc, m_bh->b_data +
 464                                       sizeof(struct gfs2_dinode));
 465                 spin_unlock(&sdp->sd_statfs_spin);
 466         } else {
 467                 error = gfs2_meta_inode_buffer(l_ip, &l_bh);
 468                 if (error)
 469                         goto out_m_bh;
 470
 471                 spin_lock(&sdp->sd_statfs_spin);
 472                 gfs2_statfs_change_in(m_sc, m_bh->b_data +
 473                                       sizeof(struct gfs2_dinode));
 474                 gfs2_statfs_change_in(l_sc, l_bh->b_data +
 475                                       sizeof(struct gfs2_dinode));
 476                 spin_unlock(&sdp->sd_statfs_spin);
 477
 478                 brelse(l_bh);
 479         }
 480
 481 out_m_bh:
 482         brelse(m_bh);
 483 out:
 484         gfs2_glock_dq_uninit(&gh);
 485         return 0;
 486 }
 487
 488 void gfs2_statfs_change(struct gfs2_sbd *sdp, s64 total, s64 free,
 489                         s64 dinodes)
 490 {
 491         struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
 492         struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
 493         struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
 494         struct buffer_head *l_bh;
 495         s64 x, y;
 496         int need_sync = 0;
 497         int error;
 498
 499         error = gfs2_meta_inode_buffer(l_ip, &l_bh);
 500         if (error)
 501                 return;
 502
 503         gfs2_trans_add_meta(l_ip->i_gl, l_bh);
 504
 505         spin_lock(&sdp->sd_statfs_spin);
 506         l_sc->sc_total += total;
 507         l_sc->sc_free += free;
 508         l_sc->sc_dinodes += dinodes;
 509         gfs2_statfs_change_out(l_sc, l_bh->b_data + sizeof(struct gfs2_dinode));
 510         if (sdp->sd_args.ar_statfs_percent) {
 511                 x = 100 * l_sc->sc_free;
 512                 y = m_sc->sc_free * sdp->sd_args.ar_statfs_percent;
 513                 if (x >= y || x <= -y)
 514                         need_sync = 1;
 515         }
 516         spin_unlock(&sdp->sd_statfs_spin);
 517
 518         brelse(l_bh);
 519         if (need_sync)
 520                 gfs2_wake_up_statfs(sdp);
 521 }
 522
 523 void update_statfs(struct gfs2_sbd *sdp, struct buffer_head *m_bh,
 524                    struct buffer_head *l_bh)
 525 {
 526         struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
 527         struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
 528         struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
 529         struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
 530
 531         gfs2_trans_add_meta(l_ip->i_gl, l_bh);
 532
 533         spin_lock(&sdp->sd_statfs_spin);
 534         m_sc->sc_total += l_sc->sc_total;
 535         m_sc->sc_free += l_sc->sc_free;
 536         m_sc->sc_dinodes += l_sc->sc_dinodes;
 537         memset(l_sc, 0, sizeof(struct gfs2_statfs_change));
 538         memset(l_bh->b_data + sizeof(struct gfs2_dinode),
 539                0, sizeof(struct gfs2_statfs_change));
 540         spin_unlock(&sdp->sd_statfs_spin);
 541
 542         gfs2_trans_add_meta(m_ip->i_gl, m_bh);
 543         gfs2_statfs_change_out(m_sc, m_bh->b_data + sizeof(struct gfs2_dinode));
 544 }
 545
 546 int gfs2_statfs_sync(struct super_block *sb, int type)
 547 {
 548         struct gfs2_sbd *sdp = sb->s_fs_info;
 549         struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
 550         struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
 551         struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
 552         struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
 553         struct gfs2_holder gh;
 554         struct buffer_head *m_bh, *l_bh;
 555         int error;
 556
 557         error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE,
 558                                    &gh);
 559         if (error)
 560                 return error;
 561
 562         error = gfs2_meta_inode_buffer(m_ip, &m_bh);
 563         if (error)
 564                 goto out;
 565
 566         spin_lock(&sdp->sd_statfs_spin);
 567         gfs2_statfs_change_in(m_sc, m_bh->b_data +
 568                               sizeof(struct gfs2_dinode));
 569         if (!l_sc->sc_total && !l_sc->sc_free && !l_sc->sc_dinodes) {
 570                 spin_unlock(&sdp->sd_statfs_spin);
 571                 goto out_bh;
 572         }
 573         spin_unlock(&sdp->sd_statfs_spin);
 574
 575         error = gfs2_meta_inode_buffer(l_ip, &l_bh);
 576         if (error)
 577                 goto out_bh;
 578
 579         error = gfs2_trans_begin(sdp, 2 * RES_DINODE, 0);
 580         if (error)
 581                 goto out_bh2;
 582
 583         update_statfs(sdp, m_bh, l_bh);
 584         sdp->sd_statfs_force_sync = 0;
 585
 586         gfs2_trans_end(sdp);
 587
 588 out_bh2:
 589         brelse(l_bh);
 590 out_bh:
 591         brelse(m_bh);
 592 out:
 593         gfs2_glock_dq_uninit(&gh);
 594         return error;
 595 }
 596
 597 struct lfcc {
 598         struct list_head list;
 599         struct gfs2_holder gh;
 600 };
 601
 602 /**
 603  * gfs2_lock_fs_check_clean - Stop all writes to the FS and check that all
 604  *                            journals are clean
 605  * @sdp: the file system
 606  * @state: the state to put the transaction lock into
 607  * @t_gh: the hold on the transaction lock
 608  *
 609  * Returns: errno
 610  */
 611
 612 static int gfs2_lock_fs_check_clean(struct gfs2_sbd *sdp,
 613                                     struct gfs2_holder *t_gh)
 614 {
 615         struct gfs2_inode *ip;
 616         struct gfs2_jdesc *jd;
 617         struct lfcc *lfcc;
 618         LIST_HEAD(list);
 619         struct gfs2_log_header_host lh;
 620         int error;
 621
 622         list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
 623                 lfcc = kmalloc(sizeof(struct lfcc), GFP_KERNEL);
 624                 if (!lfcc) {
 625                         error = -ENOMEM;
 626                         goto out;
 627                 }
 628                 ip = GFS2_I(jd->jd_inode);
 629                 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &lfcc->gh);
 630                 if (error) {
 631                         kfree(lfcc);
 632                         goto out;
 633                 }
 634                 list_add(&lfcc->list, &list);
 635         }
 636
 637         error = gfs2_glock_nq_init(sdp->sd_trans_gl, LM_ST_DEFERRED,
 638                                    GL_NOCACHE, t_gh);
 639
 640         list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
 641                 error = gfs2_jdesc_check(jd);
 642                 if (error)
 643                         break;
 644                 error = gfs2_find_jhead(jd, &lh);
 645                 if (error)
 646                         break;
 647                 if (!(lh.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) {
 648                         error = -EBUSY;
 649                         break;
 650                 }
 651         }
 652
 653         if (error)
 654                 gfs2_glock_dq_uninit(t_gh);
 655
 656 out:
 657         while (!list_empty(&list)) {
 658                 lfcc = list_entry(list.next, struct lfcc, list);
 659                 list_del(&lfcc->list);
 660                 gfs2_glock_dq_uninit(&lfcc->gh);
 661                 kfree(lfcc);
 662         }
 663         return error;
 664 }
 665
 666 void gfs2_dinode_out(const struct gfs2_inode *ip, void *buf)
 667 {
 668         struct gfs2_dinode *str = buf;
 669
 670         str->di_header.mh_magic = cpu_to_be32(GFS2_MAGIC);
 671         str->di_header.mh_type = cpu_to_be32(GFS2_METATYPE_DI);
 672         str->di_header.mh_format = cpu_to_be32(GFS2_FORMAT_DI);
 673         str->di_num.no_addr = cpu_to_be64(ip->i_no_addr);
 674         str->di_num.no_formal_ino = cpu_to_be64(ip->i_no_formal_ino);
 675         str->di_mode = cpu_to_be32(ip->i_inode.i_mode);
 676         str->di_uid = cpu_to_be32(i_uid_read(&ip->i_inode));
 677         str->di_gid = cpu_to_be32(i_gid_read(&ip->i_inode));
 678         str->di_nlink = cpu_to_be32(ip->i_inode.i_nlink);
 679         str->di_size = cpu_to_be64(i_size_read(&ip->i_inode));
 680         str->di_blocks = cpu_to_be64(gfs2_get_inode_blocks(&ip->i_inode));
 681         str->di_atime = cpu_to_be64(ip->i_inode.i_atime.tv_sec);
 682         str->di_mtime = cpu_to_be64(ip->i_inode.i_mtime.tv_sec);
 683         str->di_ctime = cpu_to_be64(ip->i_inode.i_ctime.tv_sec);
 684
 685         str->di_goal_meta = cpu_to_be64(ip->i_goal);
 686         str->di_goal_data = cpu_to_be64(ip->i_goal);
 687         str->di_generation = cpu_to_be64(ip->i_generation);
 688
 689         str->di_flags = cpu_to_be32(ip->i_diskflags);
 690         str->di_height = cpu_to_be16(ip->i_height);
 691         str->di_payload_format = cpu_to_be32(S_ISDIR(ip->i_inode.i_mode) &&
 692                                              !(ip->i_diskflags & GFS2_DIF_EXHASH) ?
 693                                              GFS2_FORMAT_DE : 0);
 694         str->di_depth = cpu_to_be16(ip->i_depth);
 695         str->di_entries = cpu_to_be32(ip->i_entries);
 696
 697         str->di_eattr = cpu_to_be64(ip->i_eattr);
 698         str->di_atime_nsec = cpu_to_be32(ip->i_inode.i_atime.tv_nsec);
 699         str->di_mtime_nsec = cpu_to_be32(ip->i_inode.i_mtime.tv_nsec);
 700         str->di_ctime_nsec = cpu_to_be32(ip->i_inode.i_ctime.tv_nsec);
 701 }
 702
 703 /**
 704  * gfs2_write_inode - Make sure the inode is stable on the disk
 705  * @inode: The inode
 706  * @wbc: The writeback control structure
 707  *
 708  * Returns: errno
 709  */
 710
 711 static int gfs2_write_inode(struct inode *inode, struct writeback_control *wbc)
 712 {
 713         struct gfs2_inode *ip = GFS2_I(inode);
 714         struct gfs2_sbd *sdp = GFS2_SB(inode);
 715         struct address_space *metamapping = gfs2_glock2aspace(ip->i_gl);
 716         struct backing_dev_info *bdi = metamapping->backing_dev_info;
 717         int ret = 0;
 718
 719         if (wbc->sync_mode == WB_SYNC_ALL)
 720                 gfs2_log_flush(GFS2_SB(inode), ip->i_gl);
 721         if (bdi->dirty_exceeded)
 722                 gfs2_ail1_flush(sdp, wbc);
 723         else
 724                 filemap_fdatawrite(metamapping);
 725         if (wbc->sync_mode == WB_SYNC_ALL)
 726                 ret = filemap_fdatawait(metamapping);
 727         if (ret)
 728                 mark_inode_dirty_sync(inode);
 729         return ret;
 730 }
 731
 732 /**
 733  * gfs2_dirty_inode - check for atime updates
 734  * @inode: The inode in question
 735  * @flags: The type of dirty
 736  *
 737  * Unfortunately it can be called under any combination of inode
 738  * glock and transaction lock, so we have to check carefully.
 739  *
 740  * At the moment this deals only with atime - it should be possible
 741  * to expand that role in future, once a review of the locking has
 742  * been carried out.
 743  */
 744
 745 static void gfs2_dirty_inode(struct inode *inode, int flags)
 746 {
 747         struct gfs2_inode *ip = GFS2_I(inode);
 748         struct gfs2_sbd *sdp = GFS2_SB(inode);
 749         struct buffer_head *bh;
 750         struct gfs2_holder gh;
 751         int need_unlock = 0;
 752         int need_endtrans = 0;
 753         int ret;
 754
 755         if (!(flags & (I_DIRTY_DATASYNC|I_DIRTY_SYNC)))
 756                 return;
 757
 758         if (!gfs2_glock_is_locked_by_me(ip->i_gl)) {
 759                 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
 760                 if (ret) {
 761                         fs_err(sdp, "dirty_inode: glock %d\n", ret);
 762                         return;
 763                 }
 764                 need_unlock = 1;
 765         } else if (WARN_ON_ONCE(ip->i_gl->gl_state != LM_ST_EXCLUSIVE))
 766                 return;
 767
 768         if (current->journal_info == NULL) {
 769                 ret = gfs2_trans_begin(sdp, RES_DINODE, 0);
 770                 if (ret) {
 771                         fs_err(sdp, "dirty_inode: gfs2_trans_begin %d\n", ret);
 772                         goto out;
 773                 }
 774                 need_endtrans = 1;
 775         }
 776
 777         ret = gfs2_meta_inode_buffer(ip, &bh);
 778         if (ret == 0) {
 779                 gfs2_trans_add_meta(ip->i_gl, bh);
 780                 gfs2_dinode_out(ip, bh->b_data);
 781                 brelse(bh);
 782         }
 783
 784         if (need_endtrans)
 785                 gfs2_trans_end(sdp);
 786 out:
 787         if (need_unlock)
 788                 gfs2_glock_dq_uninit(&gh);
 789 }
 790
 791 /**
 792  * gfs2_make_fs_ro - Turn a Read-Write FS into a Read-Only one
 793  * @sdp: the filesystem
 794  *
 795  * Returns: errno
 796  */
 797
 798 static int gfs2_make_fs_ro(struct gfs2_sbd *sdp)
 799 {
 800         struct gfs2_holder t_gh;
 801         int error;
 802
 803         flush_workqueue(gfs2_delete_workqueue);
 804         gfs2_quota_sync(sdp->sd_vfs, 0);
 805         gfs2_statfs_sync(sdp->sd_vfs, 0);
 806
 807         error = gfs2_glock_nq_init(sdp->sd_trans_gl, LM_ST_SHARED, GL_NOCACHE,
 808                                    &t_gh);
 809         if (error && !test_bit(SDF_SHUTDOWN, &sdp->sd_flags))
 810                 return error;
 811
 812         gfs2_meta_syncfs(sdp);
 813         gfs2_log_shutdown(sdp);
 814
 815         clear_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags);
 816
 817         if (t_gh.gh_gl)
 818                 gfs2_glock_dq_uninit(&t_gh);
 819
 820         gfs2_quota_cleanup(sdp);
 821
 822         return error;
 823 }
 824
 825 static int gfs2_umount_recovery_wait(void *word)
 826 {
 827         schedule();
 828         return 0;
 829 }
 830
 831 /**
 832  * gfs2_put_super - Unmount the filesystem
 833  * @sb: The VFS superblock
 834  *
 835  */
 836
 837 static void gfs2_put_super(struct super_block *sb)
 838 {
 839         struct gfs2_sbd *sdp = sb->s_fs_info;
 840         int error;
 841         struct gfs2_jdesc *jd;
 842
 843         /* No more recovery requests */
 844         set_bit(SDF_NORECOVERY, &sdp->sd_flags);
 845         smp_mb();
 846
 847         /* Wait on outstanding recovery */
 848 restart:
 849         spin_lock(&sdp->sd_jindex_spin);
 850         list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
 851                 if (!test_bit(JDF_RECOVERY, &jd->jd_flags))
 852                         continue;
 853                 spin_unlock(&sdp->sd_jindex_spin);
 854                 wait_on_bit(&jd->jd_flags, JDF_RECOVERY,
 855                             gfs2_umount_recovery_wait, TASK_UNINTERRUPTIBLE);
 856                 goto restart;
 857         }
 858         spin_unlock(&sdp->sd_jindex_spin);
 859
 860         kthread_stop(sdp->sd_quotad_process);
 861         kthread_stop(sdp->sd_logd_process);
 862
 863         if (!(sb->s_flags & MS_RDONLY)) {
 864                 error = gfs2_make_fs_ro(sdp);
 865                 if (error)
 866                         gfs2_io_error(sdp);
 867         }
 868         /*  At this point, we're through modifying the disk  */
 869
 870         /*  Release stuff  */
 871
 872         iput(sdp->sd_jindex);
 873         iput(sdp->sd_statfs_inode);
 874         iput(sdp->sd_rindex);
 875         iput(sdp->sd_quota_inode);
 876
 877         gfs2_glock_put(sdp->sd_rename_gl);
 878         gfs2_glock_put(sdp->sd_trans_gl);
 879
 880         if (!sdp->sd_args.ar_spectator) {
 881                 gfs2_glock_dq_uninit(&sdp->sd_journal_gh);
 882                 gfs2_glock_dq_uninit(&sdp->sd_jinode_gh);
 883                 gfs2_glock_dq_uninit(&sdp->sd_sc_gh);
 884                 gfs2_glock_dq_uninit(&sdp->sd_qc_gh);
 885                 iput(sdp->sd_sc_inode);
 886                 iput(sdp->sd_qc_inode);
 887         }
 888
 889         gfs2_glock_dq_uninit(&sdp->sd_live_gh);
 890         gfs2_clear_rgrpd(sdp);
 891         gfs2_jindex_free(sdp);
 892         /*  Take apart glock structures and buffer lists  */
 893         gfs2_gl_hash_clear(sdp);
 894         /*  Unmount the locking protocol  */
 895         gfs2_lm_unmount(sdp);
 896
 897         /*  At this point, we're through participating in the lockspace  */
 898         gfs2_sys_fs_del(sdp);
 899 }
 900
 901 /**
 902  * gfs2_sync_fs - sync the filesystem
 903  * @sb: the superblock
 904  *
 905  * Flushes the log to disk.
 906  */
 907
 908 static int gfs2_sync_fs(struct super_block *sb, int wait)
 909 {
 910         struct gfs2_sbd *sdp = sb->s_fs_info;
 911
 912         gfs2_quota_sync(sb, -1);
 913         if (wait && sdp)
 914                 gfs2_log_flush(sdp, NULL);
 915         return 0;
 916 }
 917
 918 /**
 919  * gfs2_freeze - prevent further writes to the filesystem
 920  * @sb: the VFS structure for the filesystem
 921  *
 922  */
 923
 924 static int gfs2_freeze(struct super_block *sb)
 925 {
 926         struct gfs2_sbd *sdp = sb->s_fs_info;
 927         int error;
 928
 929         if (test_bit(SDF_SHUTDOWN, &sdp->sd_flags))
 930                 return -EINVAL;
 931
 932         for (;;) {
 933                 error = gfs2_lock_fs_check_clean(sdp, &sdp->sd_freeze_gh);
 934                 if (!error)
 935                         break;
 936
 937                 switch (error) {
 938                 case -EBUSY:
 939                         fs_err(sdp, "waiting for recovery before freeze\n");
 940                         break;
 941
 942                 default:
 943                         fs_err(sdp, "error freezing FS: %d\n", error);
 944                         break;
 945                 }
 946
 947                 fs_err(sdp, "retrying...\n");
 948                 msleep(1000);
 949         }
 950         return 0;
 951 }
 952
 953 /**
 954  * gfs2_unfreeze - reallow writes to the filesystem
 955  * @sb: the VFS structure for the filesystem
 956  *
 957  */
 958
 959 static int gfs2_unfreeze(struct super_block *sb)
 960 {
 961         struct gfs2_sbd *sdp = sb->s_fs_info;
 962
 963         gfs2_glock_dq_uninit(&sdp->sd_freeze_gh);
 964         return 0;
 965 }
 966
 967 /**
 968  * statfs_fill - fill in the sg for a given RG
 969  * @rgd: the RG
 970  * @sc: the sc structure
 971  *
 972  * Returns: 0 on success, -ESTALE if the LVB is invalid
 973  */
 974
 975 static int statfs_slow_fill(struct gfs2_rgrpd *rgd,
 976                             struct gfs2_statfs_change_host *sc)
 977 {
 978         gfs2_rgrp_verify(rgd);
 979         sc->sc_total += rgd->rd_data;
 980         sc->sc_free += rgd->rd_free;
 981         sc->sc_dinodes += rgd->rd_dinodes;
 982         return 0;
 983 }
 984
 985 /**
 986  * gfs2_statfs_slow - Stat a filesystem using asynchronous locking
 987  * @sdp: the filesystem
 988  * @sc: the sc info that will be returned
 989  *
 990  * Any error (other than a signal) will cause this routine to fall back
 991  * to the synchronous version.
 992  *
 993  * FIXME: This really shouldn't busy wait like this.
 994  *
 995  * Returns: errno
 996  */
 997
 998 static int gfs2_statfs_slow(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *sc)
 999 {
1000         struct gfs2_rgrpd *rgd_next;
1001         struct gfs2_holder *gha, *gh;
1002         unsigned int slots = 64;
1003         unsigned int x;
1004         int done;
1005         int error = 0, err;
1006
1007         memset(sc, 0, sizeof(struct gfs2_statfs_change_host));
1008         gha = kcalloc(slots, sizeof(struct gfs2_holder), GFP_KERNEL);
1009         if (!gha)
1010                 return -ENOMEM;
1011
1012         rgd_next = gfs2_rgrpd_get_first(sdp);
1013
1014         for (;;) {
1015                 done = 1;
1016
1017                 for (x = 0; x < slots; x++) {
1018                         gh = gha + x;
1019
1020                         if (gh->gh_gl && gfs2_glock_poll(gh)) {
1021                                 err = gfs2_glock_wait(gh);
1022                                 if (err) {
1023                                         gfs2_holder_uninit(gh);
1024                                         error = err;
1025                                 } else {
1026                                         if (!error)
1027                                                 error = statfs_slow_fill(
1028                                                         gh->gh_gl->gl_object, sc);
1029                                         gfs2_glock_dq_uninit(gh);
1030                                 }
1031                         }
1032
1033                         if (gh->gh_gl)
1034                                 done = 0;
1035                         else if (rgd_next && !error) {
1036                                 error = gfs2_glock_nq_init(rgd_next->rd_gl,
1037                                                            LM_ST_SHARED,
1038                                                            GL_ASYNC,
1039                                                            gh);
1040                                 rgd_next = gfs2_rgrpd_get_next(rgd_next);
1041                                 done = 0;
1042                         }
1043
1044                         if (signal_pending(current))
1045                                 error = -ERESTARTSYS;
1046                 }
1047
1048                 if (done)
1049                         break;
1050
1051                 yield();
1052         }
1053
1054         kfree(gha);
1055         return error;
1056 }
1057
1058 /**
1059  * gfs2_statfs_i - Do a statfs
1060  * @sdp: the filesystem
1061  * @sg: the sg structure
1062  *
1063  * Returns: errno
1064  */
1065
1066 static int gfs2_statfs_i(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *sc)
1067 {
1068         struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
1069         struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
1070
1071         spin_lock(&sdp->sd_statfs_spin);
1072
1073         *sc = *m_sc;
1074         sc->sc_total += l_sc->sc_total;
1075         sc->sc_free += l_sc->sc_free;
1076         sc->sc_dinodes += l_sc->sc_dinodes;
1077
1078         spin_unlock(&sdp->sd_statfs_spin);
1079
1080         if (sc->sc_free < 0)
1081                 sc->sc_free = 0;
1082         if (sc->sc_free > sc->sc_total)
1083                 sc->sc_free = sc->sc_total;
1084         if (sc->sc_dinodes < 0)
1085                 sc->sc_dinodes = 0;
1086
1087         return 0;
1088 }
1089
1090 /**
1091  * gfs2_statfs - Gather and return stats about the filesystem
1092  * @sb: The superblock
1093  * @statfsbuf: The buffer
1094  *
1095  * Returns: 0 on success or error code
1096  */
1097
1098 static int gfs2_statfs(struct dentry *dentry, struct kstatfs *buf)
1099 {
1100         struct super_block *sb = dentry->d_inode->i_sb;
1101         struct gfs2_sbd *sdp = sb->s_fs_info;
1102         struct gfs2_statfs_change_host sc;
1103         int error;
1104
1105         error = gfs2_rindex_update(sdp);
1106         if (error)
1107                 return error;
1108
1109         if (gfs2_tune_get(sdp, gt_statfs_slow))
1110                 error = gfs2_statfs_slow(sdp, &sc);
1111         else
1112                 error = gfs2_statfs_i(sdp, &sc);
1113
1114         if (error)
1115                 return error;
1116
1117         buf->f_type = GFS2_MAGIC;
1118         buf->f_bsize = sdp->sd_sb.sb_bsize;
1119         buf->f_blocks = sc.sc_total;
1120         buf->f_bfree = sc.sc_free;
1121         buf->f_bavail = sc.sc_free;
1122         buf->f_files = sc.sc_dinodes + sc.sc_free;
1123         buf->f_ffree = sc.sc_free;
1124         buf->f_namelen = GFS2_FNAMESIZE;
1125
1126         return 0;
1127 }
1128
1129 /**
1130  * gfs2_remount_fs - called when the FS is remounted
1131  * @sb:  the filesystem
1132  * @flags:  the remount flags
1133  * @data:  extra data passed in (not used right now)
1134  *
1135  * Returns: errno
1136  */
1137
1138 static int gfs2_remount_fs(struct super_block *sb, int *flags, char *data)
1139 {
1140         struct gfs2_sbd *sdp = sb->s_fs_info;
1141         struct gfs2_args args = sdp->sd_args; /* Default to current settings */
1142         struct gfs2_tune *gt = &sdp->sd_tune;
1143         int error;
1144
1145         spin_lock(&gt->gt_spin);
1146         args.ar_commit = gt->gt_logd_secs;
1147         args.ar_quota_quantum = gt->gt_quota_quantum;
1148         if (gt->gt_statfs_slow)
1149                 args.ar_statfs_quantum = 0;
1150         else
1151                 args.ar_statfs_quantum = gt->gt_statfs_quantum;
1152         spin_unlock(&gt->gt_spin);
1153         error = gfs2_mount_args(&args, data);
1154         if (error)
1155                 return error;
1156
1157         /* Not allowed to change locking details */
1158         if (strcmp(args.ar_lockproto, sdp->sd_args.ar_lockproto) ||
1159             strcmp(args.ar_locktable, sdp->sd_args.ar_locktable) ||
1160             strcmp(args.ar_hostdata, sdp->sd_args.ar_hostdata))
1161                 return -EINVAL;
1162
1163         /* Some flags must not be changed */
1164         if (args_neq(&args, &sdp->sd_args, spectator) ||
1165             args_neq(&args, &sdp->sd_args, localflocks) ||
1166             args_neq(&args, &sdp->sd_args, meta))
1167                 return -EINVAL;
1168
1169         if (sdp->sd_args.ar_spectator)
1170                 *flags |= MS_RDONLY;
1171
1172         if ((sb->s_flags ^ *flags) & MS_RDONLY) {
1173                 if (*flags & MS_RDONLY)
1174                         error = gfs2_make_fs_ro(sdp);
1175                 else
1176                         error = gfs2_make_fs_rw(sdp);
1177                 if (error)
1178                         return error;
1179         }
1180
1181         sdp->sd_args = args;
1182         if (sdp->sd_args.ar_posix_acl)
1183                 sb->s_flags |= MS_POSIXACL;
1184         else
1185                 sb->s_flags &= ~MS_POSIXACL;
1186         if (sdp->sd_args.ar_nobarrier)
1187                 set_bit(SDF_NOBARRIERS, &sdp->sd_flags);
1188         else
1189                 clear_bit(SDF_NOBARRIERS, &sdp->sd_flags);
1190         spin_lock(&gt->gt_spin);
1191         gt->gt_logd_secs = args.ar_commit;
1192         gt->gt_quota_quantum = args.ar_quota_quantum;
1193         if (args.ar_statfs_quantum) {
1194                 gt->gt_statfs_slow = 0;
1195                 gt->gt_statfs_quantum = args.ar_statfs_quantum;
1196         }
1197         else {
1198                 gt->gt_statfs_slow = 1;
1199                 gt->gt_statfs_quantum = 30;
1200         }
1201         spin_unlock(&gt->gt_spin);
1202
1203         gfs2_online_uevent(sdp);
1204         return 0;
1205 }
1206
1207 /**
1208  * gfs2_drop_inode - Drop an inode (test for remote unlink)
1209  * @inode: The inode to drop
1210  *
1211  * If we've received a callback on an iopen lock then its because a
1212  * remote node tried to deallocate the inode but failed due to this node
1213  * still having the inode open. Here we mark the link count zero
1214  * since we know that it must have reached zero if the GLF_DEMOTE flag
1215  * is set on the iopen glock. If we didn't do a disk read since the
1216  * remote node removed the final link then we might otherwise miss
1217  * this event. This check ensures that this node will deallocate the
1218  * inode's blocks, or alternatively pass the baton on to another
1219  * node for later deallocation.
1220  */
1221
1222 static int gfs2_drop_inode(struct inode *inode)
1223 {
1224         struct gfs2_inode *ip = GFS2_I(inode);
1225
1226         if (inode->i_nlink) {
1227                 struct gfs2_glock *gl = ip->i_iopen_gh.gh_gl;
1228                 if (gl && test_bit(GLF_DEMOTE, &gl->gl_flags))
1229                         clear_nlink(inode);
1230         }
1231         return generic_drop_inode(inode);
1232 }
1233
1234 static int is_ancestor(const struct dentry *d1, const struct dentry *d2)
1235 {
1236         do {
1237                 if (d1 == d2)
1238                         return 1;
1239                 d1 = d1->d_parent;
1240         } while (!IS_ROOT(d1));
1241         return 0;
1242 }
1243
1244 /**
1245  * gfs2_show_options - Show mount options for /proc/mounts
1246  * @s: seq_file structure
1247  * @root: root of this (sub)tree
1248  *
1249  * Returns: 0 on success or error code
1250  */
1251
1252 static int gfs2_show_options(struct seq_file *s, struct dentry *root)
1253 {
1254         struct gfs2_sbd *sdp = root->d_sb->s_fs_info;
1255         struct gfs2_args *args = &sdp->sd_args;
1256         int val;
1257
1258         if (is_ancestor(root, sdp->sd_master_dir))
1259                 seq_printf(s, ",meta");
1260         if (args->ar_lockproto[0])
1261                 seq_printf(s, ",lockproto=%s", args->ar_lockproto);
1262         if (args->ar_locktable[0])
1263                 seq_printf(s, ",locktable=%s", args->ar_locktable);
1264         if (args->ar_hostdata[0])
1265                 seq_printf(s, ",hostdata=%s", args->ar_hostdata);
1266         if (args->ar_spectator)
1267                 seq_printf(s, ",spectator");
1268         if (args->ar_localflocks)
1269                 seq_printf(s, ",localflocks");
1270         if (args->ar_debug)
1271                 seq_printf(s, ",debug");
1272         if (args->ar_posix_acl)
1273                 seq_printf(s, ",acl");
1274         if (args->ar_quota != GFS2_QUOTA_DEFAULT) {
1275                 char *state;
1276                 switch (args->ar_quota) {
1277                 case GFS2_QUOTA_OFF:
1278                         state = "off";
1279                         break;
1280                 case GFS2_QUOTA_ACCOUNT:
1281                         state = "account";
1282                         break;
1283                 case GFS2_QUOTA_ON:
1284                         state = "on";
1285                         break;
1286                 default:
1287                         state = "unknown";
1288                         break;
1289                 }
1290                 seq_printf(s, ",quota=%s", state);
1291         }
1292         if (args->ar_suiddir)
1293                 seq_printf(s, ",suiddir");
1294         if (args->ar_data != GFS2_DATA_DEFAULT) {
1295                 char *state;
1296                 switch (args->ar_data) {
1297                 case GFS2_DATA_WRITEBACK:
1298                         state = "writeback";
1299                         break;
1300                 case GFS2_DATA_ORDERED:
1301                         state = "ordered";
1302                         break;
1303                 default:
1304                         state = "unknown";
1305                         break;
1306                 }
1307                 seq_printf(s, ",data=%s", state);
1308         }
1309         if (args->ar_discard)
1310                 seq_printf(s, ",discard");
1311         val = sdp->sd_tune.gt_logd_secs;
1312         if (val != 30)
1313                 seq_printf(s, ",commit=%d", val);
1314         val = sdp->sd_tune.gt_statfs_quantum;
1315         if (val != 30)
1316                 seq_printf(s, ",statfs_quantum=%d", val);
1317         else if (sdp->sd_tune.gt_statfs_slow)
1318                 seq_puts(s, ",statfs_quantum=0");
1319         val = sdp->sd_tune.gt_quota_quantum;
1320         if (val != 60)
1321                 seq_printf(s, ",quota_quantum=%d", val);
1322         if (args->ar_statfs_percent)
1323                 seq_printf(s, ",statfs_percent=%d", args->ar_statfs_percent);
1324         if (args->ar_errors != GFS2_ERRORS_DEFAULT) {
1325                 const char *state;
1326
1327                 switch (args->ar_errors) {
1328                 case GFS2_ERRORS_WITHDRAW:
1329                         state = "withdraw";
1330                         break;
1331                 case GFS2_ERRORS_PANIC:
1332                         state = "panic";
1333                         break;
1334                 default:
1335                         state = "unknown";
1336                         break;
1337                 }
1338                 seq_printf(s, ",errors=%s", state);
1339         }
1340         if (test_bit(SDF_NOBARRIERS, &sdp->sd_flags))
1341                 seq_printf(s, ",nobarrier");
1342         if (test_bit(SDF_DEMOTE, &sdp->sd_flags))
1343                 seq_printf(s, ",demote_interface_used");
1344         if (args->ar_rgrplvb)
1345                 seq_printf(s, ",rgrplvb");
1346         return 0;
1347 }
1348
1349 static void gfs2_final_release_pages(struct gfs2_inode *ip)
1350 {
1351         struct inode *inode = &ip->i_inode;
1352         struct gfs2_glock *gl = ip->i_gl;
1353
1354         truncate_inode_pages(gfs2_glock2aspace(ip->i_gl), 0);
1355         truncate_inode_pages(&inode->i_data, 0);
1356
1357         if (atomic_read(&gl->gl_revokes) == 0) {
1358                 clear_bit(GLF_LFLUSH, &gl->gl_flags);
1359                 clear_bit(GLF_DIRTY, &gl->gl_flags);
1360         }
1361 }
1362
1363 static int gfs2_dinode_dealloc(struct gfs2_inode *ip)
1364 {
1365         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1366         struct gfs2_rgrpd *rgd;
1367         struct gfs2_holder gh;
1368         int error;
1369
1370         if (gfs2_get_inode_blocks(&ip->i_inode) != 1) {
1371                 gfs2_consist_inode(ip);
1372                 return -EIO;
1373         }
1374
1375         error = gfs2_rindex_update(sdp);
1376         if (error)
1377                 return error;
1378
1379         error = gfs2_quota_hold(ip, NO_UID_QUOTA_CHANGE, NO_GID_QUOTA_CHANGE);
1380         if (error)
1381                 return error;
1382
1383         rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1);
1384         if (!rgd) {
1385                 gfs2_consist_inode(ip);
1386                 error = -EIO;
1387                 goto out_qs;
1388         }
1389
1390         error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &gh);
1391         if (error)
1392                 goto out_qs;
1393
1394         error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS + RES_QUOTA,
1395                                  sdp->sd_jdesc->jd_blocks);
1396         if (error)
1397                 goto out_rg_gunlock;
1398
1399         gfs2_free_di(rgd, ip);
1400
1401         gfs2_final_release_pages(ip);
1402
1403         gfs2_trans_end(sdp);
1404
1405 out_rg_gunlock:
1406         gfs2_glock_dq_uninit(&gh);
1407 out_qs:
1408         gfs2_quota_unhold(ip);
1409         return error;
1410 }
1411
1412 /**
1413  * gfs2_evict_inode - Remove an inode from cache
1414  * @inode: The inode to evict
1415  *
1416  * There are three cases to consider:
1417  * 1. i_nlink == 0, we are final opener (and must deallocate)
1418  * 2. i_nlink == 0, we are not the final opener (and cannot deallocate)
1419  * 3. i_nlink > 0
1420  *
1421  * If the fs is read only, then we have to treat all cases as per #3
1422  * since we are unable to do any deallocation. The inode will be
1423  * deallocated by the next read/write node to attempt an allocation
1424  * in the same resource group
1425  *
1426  * We have to (at the moment) hold the inodes main lock to cover
1427  * the gap between unlocking the shared lock on the iopen lock and
1428  * taking the exclusive lock. I'd rather do a shared -> exclusive
1429  * conversion on the iopen lock, but we can change that later. This
1430  * is safe, just less efficient.
1431  */
1432
1433 static void gfs2_evict_inode(struct inode *inode)
1434 {
1435         struct super_block *sb = inode->i_sb;
1436         struct gfs2_sbd *sdp = sb->s_fs_info;
1437         struct gfs2_inode *ip = GFS2_I(inode);
1438         struct gfs2_holder gh;
1439         int error;
1440
1441         if (inode->i_nlink || (sb->s_flags & MS_RDONLY))
1442                 goto out;
1443
1444         /* Must not read inode block until block type has been verified */
1445         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, &gh);
1446         if (unlikely(error)) {
1447                 ip->i_iopen_gh.gh_flags |= GL_NOCACHE;
1448                 gfs2_glock_dq_uninit(&ip->i_iopen_gh);
1449                 goto out;
1450         }
1451
1452         if (!test_bit(GIF_ALLOC_FAILED, &ip->i_flags)) {
1453                 error = gfs2_check_blk_type(sdp, ip->i_no_addr, GFS2_BLKST_UNLINKED);
1454                 if (error)
1455                         goto out_truncate;
1456         }
1457
1458         if (test_bit(GIF_INVALID, &ip->i_flags)) {
1459                 error = gfs2_inode_refresh(ip);
1460                 if (error)
1461                         goto out_truncate;
1462         }
1463
1464         ip->i_iopen_gh.gh_flags |= GL_NOCACHE;
1465         gfs2_glock_dq_wait(&ip->i_iopen_gh);
1466         gfs2_holder_reinit(LM_ST_EXCLUSIVE, LM_FLAG_TRY_1CB | GL_NOCACHE, &ip->i_iopen_gh);
1467         error = gfs2_glock_nq(&ip->i_iopen_gh);
1468         if (error)
1469                 goto out_truncate;
1470
1471         /* Case 1 starts here */
1472
1473         if (S_ISDIR(inode->i_mode) &&
1474             (ip->i_diskflags & GFS2_DIF_EXHASH)) {
1475                 error = gfs2_dir_exhash_dealloc(ip);
1476                 if (error)
1477                         goto out_unlock;
1478         }
1479
1480         if (ip->i_eattr) {
1481                 error = gfs2_ea_dealloc(ip);
1482                 if (error)
1483                         goto out_unlock;
1484         }
1485
1486         if (!gfs2_is_stuffed(ip)) {
1487                 error = gfs2_file_dealloc(ip);
1488                 if (error)
1489                         goto out_unlock;
1490         }
1491
1492         error = gfs2_dinode_dealloc(ip);
1493         goto out_unlock;
1494
1495 out_truncate:
1496         gfs2_log_flush(sdp, ip->i_gl);
1497         if (test_bit(GLF_DIRTY, &ip->i_gl->gl_flags)) {
1498                 struct address_space *metamapping = gfs2_glock2aspace(ip->i_gl);
1499                 filemap_fdatawrite(metamapping);
1500                 filemap_fdatawait(metamapping);
1501         }
1502         write_inode_now(inode, 1);
1503         gfs2_ail_flush(ip->i_gl, 0);
1504
1505         /* Case 2 starts here */
1506         error = gfs2_trans_begin(sdp, 0, sdp->sd_jdesc->jd_blocks);
1507         if (error)
1508                 goto out_unlock;
1509         /* Needs to be done before glock release & also in a transaction */
1510         truncate_inode_pages(&inode->i_data, 0);
1511         gfs2_trans_end(sdp);
1512
1513 out_unlock:
1514         /* Error path for case 1 */
1515         if (gfs2_rs_active(ip->i_res))
1516                 gfs2_rs_deltree(ip->i_res);
1517
1518         if (test_bit(HIF_HOLDER, &ip->i_iopen_gh.gh_iflags)) {
1519                 ip->i_iopen_gh.gh_flags |= GL_NOCACHE;
1520                 gfs2_glock_dq(&ip->i_iopen_gh);
1521         }
1522         gfs2_holder_uninit(&ip->i_iopen_gh);
1523         gfs2_glock_dq_uninit(&gh);
1524         if (error && error != GLR_TRYFAILED && error != -EROFS)
1525                 fs_warn(sdp, "gfs2_evict_inode: %d\n", error);
1526 out:
1527         /* Case 3 starts here */
1528         truncate_inode_pages(&inode->i_data, 0);
1529         gfs2_rs_delete(ip);
1530         gfs2_ordered_del_inode(ip);
1531         clear_inode(inode);
1532         gfs2_dir_hash_inval(ip);
1533         ip->i_gl->gl_object = NULL;
1534         flush_delayed_work(&ip->i_gl->gl_work);
1535         gfs2_glock_add_to_lru(ip->i_gl);
1536         gfs2_glock_put(ip->i_gl);
1537         ip->i_gl = NULL;
1538         if (ip->i_iopen_gh.gh_gl) {
1539                 ip->i_iopen_gh.gh_gl->gl_object = NULL;
1540                 ip->i_iopen_gh.gh_flags |= GL_NOCACHE;
1541                 gfs2_glock_dq_uninit(&ip->i_iopen_gh);
1542         }
1543 }
1544
1545 static struct inode *gfs2_alloc_inode(struct super_block *sb)
1546 {
1547         struct gfs2_inode *ip;
1548
1549         ip = kmem_cache_alloc(gfs2_inode_cachep, GFP_KERNEL);
1550         if (ip) {
1551                 ip->i_flags = 0;
1552                 ip->i_gl = NULL;
1553                 ip->i_rgd = NULL;
1554                 ip->i_res = NULL;
1555         }
1556         return &ip->i_inode;
1557 }
1558
1559 static void gfs2_i_callback(struct rcu_head *head)
1560 {
1561         struct inode *inode = container_of(head, struct inode, i_rcu);
1562         kmem_cache_free(gfs2_inode_cachep, inode);
1563 }
1564
1565 static void gfs2_destroy_inode(struct inode *inode)
1566 {
1567         call_rcu(&inode->i_rcu, gfs2_i_callback);
1568 }
1569
1570 const struct super_operations gfs2_super_ops = {
1571         .alloc_inode            = gfs2_alloc_inode,
1572         .destroy_inode          = gfs2_destroy_inode,
1573         .write_inode            = gfs2_write_inode,
1574         .dirty_inode            = gfs2_dirty_inode,
1575         .evict_inode            = gfs2_evict_inode,
1576         .put_super              = gfs2_put_super,
1577         .sync_fs                = gfs2_sync_fs,
1578         .freeze_fs              = gfs2_freeze,
1579         .unfreeze_fs            = gfs2_unfreeze,
1580         .statfs                 = gfs2_statfs,
1581         .remount_fs             = gfs2_remount_fs,
1582         .drop_inode             = gfs2_drop_inode,
1583         .show_options           = gfs2_show_options,
1584 };
1585