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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  11
  12 #include <linux/bio.h>
  13 #include <linux/sched/signal.h>
  14 #include <linux/slab.h>
  15 #include <linux/spinlock.h>
  16 #include <linux/completion.h>
  17 #include <linux/buffer_head.h>
  18 #include <linux/statfs.h>
  19 #include <linux/seq_file.h>
  20 #include <linux/mount.h>
  21 #include <linux/kthread.h>
  22 #include <linux/delay.h>
  23 #include <linux/gfs2_ondisk.h>
  24 #include <linux/crc32.h>
  25 #include <linux/time.h>
  26 #include <linux/wait.h>
  27 #include <linux/writeback.h>
  28 #include <linux/backing-dev.h>
  29 #include <linux/kernel.h>
  30
  31 #include "gfs2.h"
  32 #include "incore.h"
  33 #include "bmap.h"
  34 #include "dir.h"
  35 #include "glock.h"
  36 #include "glops.h"
  37 #include "inode.h"
  38 #include "log.h"
  39 #include "meta_io.h"
  40 #include "quota.h"
  41 #include "recovery.h"
  42 #include "rgrp.h"
  43 #include "super.h"
  44 #include "trans.h"
  45 #include "util.h"
  46 #include "sys.h"
  47 #include "xattr.h"
  48 #include "lops.h"
  49
  50 #define args_neq(a1, a2, x) ((a1)->ar_##x != (a2)->ar_##x)
  51
  52 enum {
  53         Opt_lockproto,
  54         Opt_locktable,
  55         Opt_hostdata,
  56         Opt_spectator,
  57         Opt_ignore_local_fs,
  58         Opt_localflocks,
  59         Opt_localcaching,
  60         Opt_debug,
  61         Opt_nodebug,
  62         Opt_upgrade,
  63         Opt_acl,
  64         Opt_noacl,
  65         Opt_quota_off,
  66         Opt_quota_account,
  67         Opt_quota_on,
  68         Opt_quota,
  69         Opt_noquota,
  70         Opt_suiddir,
  71         Opt_nosuiddir,
  72         Opt_data_writeback,
  73         Opt_data_ordered,
  74         Opt_meta,
  75         Opt_discard,
  76         Opt_nodiscard,
  77         Opt_commit,
  78         Opt_err_withdraw,
  79         Opt_err_panic,
  80         Opt_statfs_quantum,
  81         Opt_statfs_percent,
  82         Opt_quota_quantum,
  83         Opt_barrier,
  84         Opt_nobarrier,
  85         Opt_rgrplvb,
  86         Opt_norgrplvb,
  87         Opt_loccookie,
  88         Opt_noloccookie,
  89         Opt_error,
  90 };
  91
  92 static const match_table_t tokens = {
  93         {Opt_lockproto, "lockproto=%s"},
  94         {Opt_locktable, "locktable=%s"},
  95         {Opt_hostdata, "hostdata=%s"},
  96         {Opt_spectator, "spectator"},
  97         {Opt_spectator, "norecovery"},
  98         {Opt_ignore_local_fs, "ignore_local_fs"},
  99         {Opt_localflocks, "localflocks"},
 100         {Opt_localcaching, "localcaching"},
 101         {Opt_debug, "debug"},
 102         {Opt_nodebug, "nodebug"},
 103         {Opt_upgrade, "upgrade"},
 104         {Opt_acl, "acl"},
 105         {Opt_noacl, "noacl"},
 106         {Opt_quota_off, "quota=off"},
 107         {Opt_quota_account, "quota=account"},
 108         {Opt_quota_on, "quota=on"},
 109         {Opt_quota, "quota"},
 110         {Opt_noquota, "noquota"},
 111         {Opt_suiddir, "suiddir"},
 112         {Opt_nosuiddir, "nosuiddir"},
 113         {Opt_data_writeback, "data=writeback"},
 114         {Opt_data_ordered, "data=ordered"},
 115         {Opt_meta, "meta"},
 116         {Opt_discard, "discard"},
 117         {Opt_nodiscard, "nodiscard"},
 118         {Opt_commit, "commit=%d"},
 119         {Opt_err_withdraw, "errors=withdraw"},
 120         {Opt_err_panic, "errors=panic"},
 121         {Opt_statfs_quantum, "statfs_quantum=%d"},
 122         {Opt_statfs_percent, "statfs_percent=%d"},
 123         {Opt_quota_quantum, "quota_quantum=%d"},
 124         {Opt_barrier, "barrier"},
 125         {Opt_nobarrier, "nobarrier"},
 126         {Opt_rgrplvb, "rgrplvb"},
 127         {Opt_norgrplvb, "norgrplvb"},
 128         {Opt_loccookie, "loccookie"},
 129         {Opt_noloccookie, "noloccookie"},
 130         {Opt_error, NULL}
 131 };
 132
 133 /**
 134  * gfs2_mount_args - Parse mount options
 135  * @args: The structure into which the parsed options will be written
 136  * @options: The options to parse
 137  *
 138  * Return: errno
 139  */
 140
 141 int gfs2_mount_args(struct gfs2_args *args, char *options)
 142 {
 143         char *o;
 144         int token;
 145         substring_t tmp[MAX_OPT_ARGS];
 146         int rv;
 147
 148         /* Split the options into tokens with the "," character and
 149            process them */
 150
 151         while (1) {
 152                 o = strsep(&options, ",");
 153                 if (o == NULL)
 154                         break;
 155                 if (*o == '\0')
 156                         continue;
 157
 158                 token = match_token(o, tokens, tmp);
 159                 switch (token) {
 160                 case Opt_lockproto:
 161                         match_strlcpy(args->ar_lockproto, &tmp[0],
 162                                       GFS2_LOCKNAME_LEN);
 163                         break;
 164                 case Opt_locktable:
 165                         match_strlcpy(args->ar_locktable, &tmp[0],
 166                                       GFS2_LOCKNAME_LEN);
 167                         break;
 168                 case Opt_hostdata:
 169                         match_strlcpy(args->ar_hostdata, &tmp[0],
 170                                       GFS2_LOCKNAME_LEN);
 171                         break;
 172                 case Opt_spectator:
 173                         args->ar_spectator = 1;
 174                         break;
 175                 case Opt_ignore_local_fs:
 176                         /* Retained for backwards compat only */
 177                         break;
 178                 case Opt_localflocks:
 179                         args->ar_localflocks = 1;
 180                         break;
 181                 case Opt_localcaching:
 182                         /* Retained for backwards compat only */
 183                         break;
 184                 case Opt_debug:
 185                         if (args->ar_errors == GFS2_ERRORS_PANIC) {
 186                                 pr_warn("-o debug and -o errors=panic are mutually exclusive\n");
 187                                 return -EINVAL;
 188                         }
 189                         args->ar_debug = 1;
 190                         break;
 191                 case Opt_nodebug:
 192                         args->ar_debug = 0;
 193                         break;
 194                 case Opt_upgrade:
 195                         /* Retained for backwards compat only */
 196                         break;
 197                 case Opt_acl:
 198                         args->ar_posix_acl = 1;
 199                         break;
 200                 case Opt_noacl:
 201                         args->ar_posix_acl = 0;
 202                         break;
 203                 case Opt_quota_off:
 204                 case Opt_noquota:
 205                         args->ar_quota = GFS2_QUOTA_OFF;
 206                         break;
 207                 case Opt_quota_account:
 208                         args->ar_quota = GFS2_QUOTA_ACCOUNT;
 209                         break;
 210                 case Opt_quota_on:
 211                 case Opt_quota:
 212                         args->ar_quota = GFS2_QUOTA_ON;
 213                         break;
 214                 case Opt_suiddir:
 215                         args->ar_suiddir = 1;
 216                         break;
 217                 case Opt_nosuiddir:
 218                         args->ar_suiddir = 0;
 219                         break;
 220                 case Opt_data_writeback:
 221                         args->ar_data = GFS2_DATA_WRITEBACK;
 222                         break;
 223                 case Opt_data_ordered:
 224                         args->ar_data = GFS2_DATA_ORDERED;
 225                         break;
 226                 case Opt_meta:
 227                         args->ar_meta = 1;
 228                         break;
 229                 case Opt_discard:
 230                         args->ar_discard = 1;
 231                         break;
 232                 case Opt_nodiscard:
 233                         args->ar_discard = 0;
 234                         break;
 235                 case Opt_commit:
 236                         rv = match_int(&tmp[0], &args->ar_commit);
 237                         if (rv || args->ar_commit <= 0) {
 238                                 pr_warn("commit mount option requires a positive numeric argument\n");
 239                                 return rv ? rv : -EINVAL;
 240                         }
 241                         break;
 242                 case Opt_statfs_quantum:
 243                         rv = match_int(&tmp[0], &args->ar_statfs_quantum);
 244                         if (rv || args->ar_statfs_quantum < 0) {
 245                                 pr_warn("statfs_quantum mount option requires a non-negative numeric argument\n");
 246                                 return rv ? rv : -EINVAL;
 247                         }
 248                         break;
 249                 case Opt_quota_quantum:
 250                         rv = match_int(&tmp[0], &args->ar_quota_quantum);
 251                         if (rv || args->ar_quota_quantum <= 0) {
 252                                 pr_warn("quota_quantum mount option requires a positive numeric argument\n");
 253                                 return rv ? rv : -EINVAL;
 254                         }
 255                         break;
 256                 case Opt_statfs_percent:
 257                         rv = match_int(&tmp[0], &args->ar_statfs_percent);
 258                         if (rv || args->ar_statfs_percent < 0 ||
 259                             args->ar_statfs_percent > 100) {
 260                                 pr_warn("statfs_percent mount option requires a numeric argument between 0 and 100\n");
 261                                 return rv ? rv : -EINVAL;
 262                         }
 263                         break;
 264                 case Opt_err_withdraw:
 265                         args->ar_errors = GFS2_ERRORS_WITHDRAW;
 266                         break;
 267                 case Opt_err_panic:
 268                         if (args->ar_debug) {
 269                                 pr_warn("-o debug and -o errors=panic are mutually exclusive\n");
 270                                 return -EINVAL;
 271                         }
 272                         args->ar_errors = GFS2_ERRORS_PANIC;
 273                         break;
 274                 case Opt_barrier:
 275                         args->ar_nobarrier = 0;
 276                         break;
 277                 case Opt_nobarrier:
 278                         args->ar_nobarrier = 1;
 279                         break;
 280                 case Opt_rgrplvb:
 281                         args->ar_rgrplvb = 1;
 282                         break;
 283                 case Opt_norgrplvb:
 284                         args->ar_rgrplvb = 0;
 285                         break;
 286                 case Opt_loccookie:
 287                         args->ar_loccookie = 1;
 288                         break;
 289                 case Opt_noloccookie:
 290                         args->ar_loccookie = 0;
 291                         break;
 292                 case Opt_error:
 293                 default:
 294                         pr_warn("invalid mount option: %s\n", o);
 295                         return -EINVAL;
 296                 }
 297         }
 298
 299         return 0;
 300 }
 301
 302 /**
 303  * gfs2_jindex_free - Clear all the journal index information
 304  * @sdp: The GFS2 superblock
 305  *
 306  */
 307
 308 void gfs2_jindex_free(struct gfs2_sbd *sdp)
 309 {
 310         struct list_head list;
 311         struct gfs2_jdesc *jd;
 312
 313         spin_lock(&sdp->sd_jindex_spin);
 314         list_add(&list, &sdp->sd_jindex_list);
 315         list_del_init(&sdp->sd_jindex_list);
 316         sdp->sd_journals = 0;
 317         spin_unlock(&sdp->sd_jindex_spin);
 318
 319         while (!list_empty(&list)) {
 320                 jd = list_entry(list.next, struct gfs2_jdesc, jd_list);
 321                 gfs2_free_journal_extents(jd);
 322                 list_del(&jd->jd_list);
 323                 iput(jd->jd_inode);
 324                 kfree(jd);
 325         }
 326 }
 327
 328 static struct gfs2_jdesc *jdesc_find_i(struct list_head *head, unsigned int jid)
 329 {
 330         struct gfs2_jdesc *jd;
 331         int found = 0;
 332
 333         list_for_each_entry(jd, head, jd_list) {
 334                 if (jd->jd_jid == jid) {
 335                         found = 1;
 336                         break;
 337                 }
 338         }
 339
 340         if (!found)
 341                 jd = NULL;
 342
 343         return jd;
 344 }
 345
 346 struct gfs2_jdesc *gfs2_jdesc_find(struct gfs2_sbd *sdp, unsigned int jid)
 347 {
 348         struct gfs2_jdesc *jd;
 349
 350         spin_lock(&sdp->sd_jindex_spin);
 351         jd = jdesc_find_i(&sdp->sd_jindex_list, jid);
 352         spin_unlock(&sdp->sd_jindex_spin);
 353
 354         return jd;
 355 }
 356
 357 int gfs2_jdesc_check(struct gfs2_jdesc *jd)
 358 {
 359         struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
 360         struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
 361         u64 size = i_size_read(jd->jd_inode);
 362
 363         if (gfs2_check_internal_file_size(jd->jd_inode, 8 << 20, BIT(30)))
 364                 return -EIO;
 365
 366         jd->jd_blocks = size >> sdp->sd_sb.sb_bsize_shift;
 367
 368         if (gfs2_write_alloc_required(ip, 0, size)) {
 369                 gfs2_consist_inode(ip);
 370                 return -EIO;
 371         }
 372
 373         return 0;
 374 }
 375
 376 static int init_threads(struct gfs2_sbd *sdp)
 377 {
 378         struct task_struct *p;
 379         int error = 0;
 380
 381         p = kthread_run(gfs2_logd, sdp, "gfs2_logd");
 382         if (IS_ERR(p)) {
 383                 error = PTR_ERR(p);
 384                 fs_err(sdp, "can't start logd thread: %d\n", error);
 385                 return error;
 386         }
 387         sdp->sd_logd_process = p;
 388
 389         p = kthread_run(gfs2_quotad, sdp, "gfs2_quotad");
 390         if (IS_ERR(p)) {
 391                 error = PTR_ERR(p);
 392                 fs_err(sdp, "can't start quotad thread: %d\n", error);
 393                 goto fail;
 394         }
 395         sdp->sd_quotad_process = p;
 396         return 0;
 397
 398 fail:
 399         kthread_stop(sdp->sd_logd_process);
 400         return error;
 401 }
 402
 403 /**
 404  * gfs2_make_fs_rw - Turn a Read-Only FS into a Read-Write one
 405  * @sdp: the filesystem
 406  *
 407  * Returns: errno
 408  */
 409
 410 int gfs2_make_fs_rw(struct gfs2_sbd *sdp)
 411 {
 412         struct gfs2_inode *ip = GFS2_I(sdp->sd_jdesc->jd_inode);
 413         struct gfs2_glock *j_gl = ip->i_gl;
 414         struct gfs2_holder freeze_gh;
 415         struct gfs2_log_header_host head;
 416         int error;
 417
 418         error = init_threads(sdp);
 419         if (error)
 420                 return error;
 421
 422         error = gfs2_glock_nq_init(sdp->sd_freeze_gl, LM_ST_SHARED, 0,
 423                                    &freeze_gh);
 424         if (error)
 425                 goto fail_threads;
 426
 427         j_gl->gl_ops->go_inval(j_gl, DIO_METADATA);
 428
 429         error = gfs2_find_jhead(sdp->sd_jdesc, &head);
 430         if (error)
 431                 goto fail;
 432
 433         if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) {
 434                 gfs2_consist(sdp);
 435                 error = -EIO;
 436                 goto fail;
 437         }
 438
 439         /*  Initialize some head of the log stuff  */
 440         sdp->sd_log_sequence = head.lh_sequence + 1;
 441         gfs2_log_pointers_init(sdp, head.lh_blkno);
 442
 443         error = gfs2_quota_init(sdp);
 444         if (error)
 445                 goto fail;
 446
 447         set_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags);
 448
 449         gfs2_glock_dq_uninit(&freeze_gh);
 450
 451         return 0;
 452
 453 fail:
 454         freeze_gh.gh_flags |= GL_NOCACHE;
 455         gfs2_glock_dq_uninit(&freeze_gh);
 456 fail_threads:
 457         kthread_stop(sdp->sd_quotad_process);
 458         kthread_stop(sdp->sd_logd_process);
 459         return error;
 460 }
 461
 462 void gfs2_statfs_change_in(struct gfs2_statfs_change_host *sc, const void *buf)
 463 {
 464         const struct gfs2_statfs_change *str = buf;
 465
 466         sc->sc_total = be64_to_cpu(str->sc_total);
 467         sc->sc_free = be64_to_cpu(str->sc_free);
 468         sc->sc_dinodes = be64_to_cpu(str->sc_dinodes);
 469 }
 470
 471 static void gfs2_statfs_change_out(const struct gfs2_statfs_change_host *sc, void *buf)
 472 {
 473         struct gfs2_statfs_change *str = buf;
 474
 475         str->sc_total = cpu_to_be64(sc->sc_total);
 476         str->sc_free = cpu_to_be64(sc->sc_free);
 477         str->sc_dinodes = cpu_to_be64(sc->sc_dinodes);
 478 }
 479
 480 int gfs2_statfs_init(struct gfs2_sbd *sdp)
 481 {
 482         struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
 483         struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
 484         struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
 485         struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
 486         struct buffer_head *m_bh, *l_bh;
 487         struct gfs2_holder gh;
 488         int error;
 489
 490         error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE,
 491                                    &gh);
 492         if (error)
 493                 return error;
 494
 495         error = gfs2_meta_inode_buffer(m_ip, &m_bh);
 496         if (error)
 497                 goto out;
 498
 499         if (sdp->sd_args.ar_spectator) {
 500                 spin_lock(&sdp->sd_statfs_spin);
 501                 gfs2_statfs_change_in(m_sc, m_bh->b_data +
 502                                       sizeof(struct gfs2_dinode));
 503                 spin_unlock(&sdp->sd_statfs_spin);
 504         } else {
 505                 error = gfs2_meta_inode_buffer(l_ip, &l_bh);
 506                 if (error)
 507                         goto out_m_bh;
 508
 509                 spin_lock(&sdp->sd_statfs_spin);
 510                 gfs2_statfs_change_in(m_sc, m_bh->b_data +
 511                                       sizeof(struct gfs2_dinode));
 512                 gfs2_statfs_change_in(l_sc, l_bh->b_data +
 513                                       sizeof(struct gfs2_dinode));
 514                 spin_unlock(&sdp->sd_statfs_spin);
 515
 516                 brelse(l_bh);
 517         }
 518
 519 out_m_bh:
 520         brelse(m_bh);
 521 out:
 522         gfs2_glock_dq_uninit(&gh);
 523         return 0;
 524 }
 525
 526 void gfs2_statfs_change(struct gfs2_sbd *sdp, s64 total, s64 free,
 527                         s64 dinodes)
 528 {
 529         struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
 530         struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
 531         struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
 532         struct buffer_head *l_bh;
 533         s64 x, y;
 534         int need_sync = 0;
 535         int error;
 536
 537         error = gfs2_meta_inode_buffer(l_ip, &l_bh);
 538         if (error)
 539                 return;
 540
 541         gfs2_trans_add_meta(l_ip->i_gl, l_bh);
 542
 543         spin_lock(&sdp->sd_statfs_spin);
 544         l_sc->sc_total += total;
 545         l_sc->sc_free += free;
 546         l_sc->sc_dinodes += dinodes;
 547         gfs2_statfs_change_out(l_sc, l_bh->b_data + sizeof(struct gfs2_dinode));
 548         if (sdp->sd_args.ar_statfs_percent) {
 549                 x = 100 * l_sc->sc_free;
 550                 y = m_sc->sc_free * sdp->sd_args.ar_statfs_percent;
 551                 if (x >= y || x <= -y)
 552                         need_sync = 1;
 553         }
 554         spin_unlock(&sdp->sd_statfs_spin);
 555
 556         brelse(l_bh);
 557         if (need_sync)
 558                 gfs2_wake_up_statfs(sdp);
 559 }
 560
 561 void update_statfs(struct gfs2_sbd *sdp, struct buffer_head *m_bh,
 562                    struct buffer_head *l_bh)
 563 {
 564         struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
 565         struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
 566         struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
 567         struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
 568
 569         gfs2_trans_add_meta(l_ip->i_gl, l_bh);
 570         gfs2_trans_add_meta(m_ip->i_gl, m_bh);
 571
 572         spin_lock(&sdp->sd_statfs_spin);
 573         m_sc->sc_total += l_sc->sc_total;
 574         m_sc->sc_free += l_sc->sc_free;
 575         m_sc->sc_dinodes += l_sc->sc_dinodes;
 576         memset(l_sc, 0, sizeof(struct gfs2_statfs_change));
 577         memset(l_bh->b_data + sizeof(struct gfs2_dinode),
 578                0, sizeof(struct gfs2_statfs_change));
 579         gfs2_statfs_change_out(m_sc, m_bh->b_data + sizeof(struct gfs2_dinode));
 580         spin_unlock(&sdp->sd_statfs_spin);
 581 }
 582
 583 int gfs2_statfs_sync(struct super_block *sb, int type)
 584 {
 585         struct gfs2_sbd *sdp = sb->s_fs_info;
 586         struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
 587         struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
 588         struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
 589         struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
 590         struct gfs2_holder gh;
 591         struct buffer_head *m_bh, *l_bh;
 592         int error;
 593
 594         sb_start_write(sb);
 595         error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE,
 596                                    &gh);
 597         if (error)
 598                 goto out;
 599
 600         error = gfs2_meta_inode_buffer(m_ip, &m_bh);
 601         if (error)
 602                 goto out_unlock;
 603
 604         spin_lock(&sdp->sd_statfs_spin);
 605         gfs2_statfs_change_in(m_sc, m_bh->b_data +
 606                               sizeof(struct gfs2_dinode));
 607         if (!l_sc->sc_total && !l_sc->sc_free && !l_sc->sc_dinodes) {
 608                 spin_unlock(&sdp->sd_statfs_spin);
 609                 goto out_bh;
 610         }
 611         spin_unlock(&sdp->sd_statfs_spin);
 612
 613         error = gfs2_meta_inode_buffer(l_ip, &l_bh);
 614         if (error)
 615                 goto out_bh;
 616
 617         error = gfs2_trans_begin(sdp, 2 * RES_DINODE, 0);
 618         if (error)
 619                 goto out_bh2;
 620
 621         update_statfs(sdp, m_bh, l_bh);
 622         sdp->sd_statfs_force_sync = 0;
 623
 624         gfs2_trans_end(sdp);
 625
 626 out_bh2:
 627         brelse(l_bh);
 628 out_bh:
 629         brelse(m_bh);
 630 out_unlock:
 631         gfs2_glock_dq_uninit(&gh);
 632 out:
 633         sb_end_write(sb);
 634         return error;
 635 }
 636
 637 struct lfcc {
 638         struct list_head list;
 639         struct gfs2_holder gh;
 640 };
 641
 642 /**
 643  * gfs2_lock_fs_check_clean - Stop all writes to the FS and check that all
 644  *                            journals are clean
 645  * @sdp: the file system
 646  * @state: the state to put the transaction lock into
 647  * @t_gh: the hold on the transaction lock
 648  *
 649  * Returns: errno
 650  */
 651
 652 static int gfs2_lock_fs_check_clean(struct gfs2_sbd *sdp,
 653                                     struct gfs2_holder *freeze_gh)
 654 {
 655         struct gfs2_inode *ip;
 656         struct gfs2_jdesc *jd;
 657         struct lfcc *lfcc;
 658         LIST_HEAD(list);
 659         struct gfs2_log_header_host lh;
 660         int error;
 661
 662         list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
 663                 lfcc = kmalloc(sizeof(struct lfcc), GFP_KERNEL);
 664                 if (!lfcc) {
 665                         error = -ENOMEM;
 666                         goto out;
 667                 }
 668                 ip = GFS2_I(jd->jd_inode);
 669                 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &lfcc->gh);
 670                 if (error) {
 671                         kfree(lfcc);
 672                         goto out;
 673                 }
 674                 list_add(&lfcc->list, &list);
 675         }
 676
 677         error = gfs2_glock_nq_init(sdp->sd_freeze_gl, LM_ST_EXCLUSIVE,
 678                                    GL_NOCACHE, freeze_gh);
 679
 680         list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
 681                 error = gfs2_jdesc_check(jd);
 682                 if (error)
 683                         break;
 684                 error = gfs2_find_jhead(jd, &lh);
 685                 if (error)
 686                         break;
 687                 if (!(lh.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) {
 688                         error = -EBUSY;
 689                         break;
 690                 }
 691         }
 692
 693         if (error)
 694                 gfs2_glock_dq_uninit(freeze_gh);
 695
 696 out:
 697         while (!list_empty(&list)) {
 698                 lfcc = list_entry(list.next, struct lfcc, list);
 699                 list_del(&lfcc->list);
 700                 gfs2_glock_dq_uninit(&lfcc->gh);
 701                 kfree(lfcc);
 702         }
 703         return error;
 704 }
 705
 706 void gfs2_dinode_out(const struct gfs2_inode *ip, void *buf)
 707 {
 708         struct gfs2_dinode *str = buf;
 709
 710         str->di_header.mh_magic = cpu_to_be32(GFS2_MAGIC);
 711         str->di_header.mh_type = cpu_to_be32(GFS2_METATYPE_DI);
 712         str->di_header.mh_format = cpu_to_be32(GFS2_FORMAT_DI);
 713         str->di_num.no_addr = cpu_to_be64(ip->i_no_addr);
 714         str->di_num.no_formal_ino = cpu_to_be64(ip->i_no_formal_ino);
 715         str->di_mode = cpu_to_be32(ip->i_inode.i_mode);
 716         str->di_uid = cpu_to_be32(i_uid_read(&ip->i_inode));
 717         str->di_gid = cpu_to_be32(i_gid_read(&ip->i_inode));
 718         str->di_nlink = cpu_to_be32(ip->i_inode.i_nlink);
 719         str->di_size = cpu_to_be64(i_size_read(&ip->i_inode));
 720         str->di_blocks = cpu_to_be64(gfs2_get_inode_blocks(&ip->i_inode));
 721         str->di_atime = cpu_to_be64(ip->i_inode.i_atime.tv_sec);
 722         str->di_mtime = cpu_to_be64(ip->i_inode.i_mtime.tv_sec);
 723         str->di_ctime = cpu_to_be64(ip->i_inode.i_ctime.tv_sec);
 724
 725         str->di_goal_meta = cpu_to_be64(ip->i_goal);
 726         str->di_goal_data = cpu_to_be64(ip->i_goal);
 727         str->di_generation = cpu_to_be64(ip->i_generation);
 728
 729         str->di_flags = cpu_to_be32(ip->i_diskflags);
 730         str->di_height = cpu_to_be16(ip->i_height);
 731         str->di_payload_format = cpu_to_be32(S_ISDIR(ip->i_inode.i_mode) &&
 732                                              !(ip->i_diskflags & GFS2_DIF_EXHASH) ?
 733                                              GFS2_FORMAT_DE : 0);
 734         str->di_depth = cpu_to_be16(ip->i_depth);
 735         str->di_entries = cpu_to_be32(ip->i_entries);
 736
 737         str->di_eattr = cpu_to_be64(ip->i_eattr);
 738         str->di_atime_nsec = cpu_to_be32(ip->i_inode.i_atime.tv_nsec);
 739         str->di_mtime_nsec = cpu_to_be32(ip->i_inode.i_mtime.tv_nsec);
 740         str->di_ctime_nsec = cpu_to_be32(ip->i_inode.i_ctime.tv_nsec);
 741 }
 742
 743 /**
 744  * gfs2_write_inode - Make sure the inode is stable on the disk
 745  * @inode: The inode
 746  * @wbc: The writeback control structure
 747  *
 748  * Returns: errno
 749  */
 750
 751 static int gfs2_write_inode(struct inode *inode, struct writeback_control *wbc)
 752 {
 753         struct gfs2_inode *ip = GFS2_I(inode);
 754         struct gfs2_sbd *sdp = GFS2_SB(inode);
 755         struct address_space *metamapping = gfs2_glock2aspace(ip->i_gl);
 756         struct backing_dev_info *bdi = inode_to_bdi(metamapping->host);
 757         int ret = 0;
 758         bool flush_all = (wbc->sync_mode == WB_SYNC_ALL || gfs2_is_jdata(ip));
 759
 760         if (flush_all)
 761                 gfs2_log_flush(GFS2_SB(inode), ip->i_gl,
 762                                GFS2_LOG_HEAD_FLUSH_NORMAL |
 763                                GFS2_LFC_WRITE_INODE);
 764         if (bdi->wb.dirty_exceeded)
 765                 gfs2_ail1_flush(sdp, wbc);
 766         else
 767                 filemap_fdatawrite(metamapping);
 768         if (flush_all)
 769                 ret = filemap_fdatawait(metamapping);
 770         if (ret)
 771                 mark_inode_dirty_sync(inode);
 772         else {
 773                 spin_lock(&inode->i_lock);
 774                 if (!(inode->i_flags & I_DIRTY))
 775                         gfs2_ordered_del_inode(ip);
 776                 spin_unlock(&inode->i_lock);
 777         }
 778         return ret;
 779 }
 780
 781 /**
 782  * gfs2_dirty_inode - check for atime updates
 783  * @inode: The inode in question
 784  * @flags: The type of dirty
 785  *
 786  * Unfortunately it can be called under any combination of inode
 787  * glock and transaction lock, so we have to check carefully.
 788  *
 789  * At the moment this deals only with atime - it should be possible
 790  * to expand that role in future, once a review of the locking has
 791  * been carried out.
 792  */
 793
 794 static void gfs2_dirty_inode(struct inode *inode, int flags)
 795 {
 796         struct gfs2_inode *ip = GFS2_I(inode);
 797         struct gfs2_sbd *sdp = GFS2_SB(inode);
 798         struct buffer_head *bh;
 799         struct gfs2_holder gh;
 800         int need_unlock = 0;
 801         int need_endtrans = 0;
 802         int ret;
 803
 804         if (!(flags & I_DIRTY_INODE))
 805                 return;
 806         if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
 807                 return;
 808         if (!gfs2_glock_is_locked_by_me(ip->i_gl)) {
 809                 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
 810                 if (ret) {
 811                         fs_err(sdp, "dirty_inode: glock %d\n", ret);
 812                         return;
 813                 }
 814                 need_unlock = 1;
 815         } else if (WARN_ON_ONCE(ip->i_gl->gl_state != LM_ST_EXCLUSIVE))
 816                 return;
 817
 818         if (current->journal_info == NULL) {
 819                 ret = gfs2_trans_begin(sdp, RES_DINODE, 0);
 820                 if (ret) {
 821                         fs_err(sdp, "dirty_inode: gfs2_trans_begin %d\n", ret);
 822                         goto out;
 823                 }
 824                 need_endtrans = 1;
 825         }
 826
 827         ret = gfs2_meta_inode_buffer(ip, &bh);
 828         if (ret == 0) {
 829                 gfs2_trans_add_meta(ip->i_gl, bh);
 830                 gfs2_dinode_out(ip, bh->b_data);
 831                 brelse(bh);
 832         }
 833
 834         if (need_endtrans)
 835                 gfs2_trans_end(sdp);
 836 out:
 837         if (need_unlock)
 838                 gfs2_glock_dq_uninit(&gh);
 839 }
 840
 841 /**
 842  * gfs2_make_fs_ro - Turn a Read-Write FS into a Read-Only one
 843  * @sdp: the filesystem
 844  *
 845  * Returns: errno
 846  */
 847
 848 static int gfs2_make_fs_ro(struct gfs2_sbd *sdp)
 849 {
 850         struct gfs2_holder freeze_gh;
 851         int error;
 852
 853         error = gfs2_glock_nq_init(sdp->sd_freeze_gl, LM_ST_SHARED, GL_NOCACHE,
 854                                    &freeze_gh);
 855         if (error && !test_bit(SDF_SHUTDOWN, &sdp->sd_flags))
 856                 return error;
 857
 858         flush_workqueue(gfs2_delete_workqueue);
 859         kthread_stop(sdp->sd_quotad_process);
 860         kthread_stop(sdp->sd_logd_process);
 861
 862         gfs2_quota_sync(sdp->sd_vfs, 0);
 863         gfs2_statfs_sync(sdp->sd_vfs, 0);
 864
 865         gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_SHUTDOWN |
 866                        GFS2_LFC_MAKE_FS_RO);
 867         wait_event(sdp->sd_reserving_log_wait, atomic_read(&sdp->sd_reserving_log) == 0);
 868         gfs2_assert_warn(sdp, atomic_read(&sdp->sd_log_blks_free) == sdp->sd_jdesc->jd_blocks);
 869
 870         if (gfs2_holder_initialized(&freeze_gh))
 871                 gfs2_glock_dq_uninit(&freeze_gh);
 872
 873         gfs2_quota_cleanup(sdp);
 874
 875         return error;
 876 }
 877
 878 /**
 879  * gfs2_put_super - Unmount the filesystem
 880  * @sb: The VFS superblock
 881  *
 882  */
 883
 884 static void gfs2_put_super(struct super_block *sb)
 885 {
 886         struct gfs2_sbd *sdp = sb->s_fs_info;
 887         int error;
 888         struct gfs2_jdesc *jd;
 889
 890         /* No more recovery requests */
 891         set_bit(SDF_NORECOVERY, &sdp->sd_flags);
 892         smp_mb();
 893
 894         /* Wait on outstanding recovery */
 895 restart:
 896         spin_lock(&sdp->sd_jindex_spin);
 897         list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
 898                 if (!test_bit(JDF_RECOVERY, &jd->jd_flags))
 899                         continue;
 900                 spin_unlock(&sdp->sd_jindex_spin);
 901                 wait_on_bit(&jd->jd_flags, JDF_RECOVERY,
 902                             TASK_UNINTERRUPTIBLE);
 903                 goto restart;
 904         }
 905         spin_unlock(&sdp->sd_jindex_spin);
 906
 907         if (!sb_rdonly(sb)) {
 908                 error = gfs2_make_fs_ro(sdp);
 909                 if (error)
 910                         gfs2_io_error(sdp);
 911         }
 912         /*  At this point, we're through modifying the disk  */
 913
 914         /*  Release stuff  */
 915
 916         iput(sdp->sd_jindex);
 917         iput(sdp->sd_statfs_inode);
 918         iput(sdp->sd_rindex);
 919         iput(sdp->sd_quota_inode);
 920
 921         gfs2_glock_put(sdp->sd_rename_gl);
 922         gfs2_glock_put(sdp->sd_freeze_gl);
 923
 924         if (!sdp->sd_args.ar_spectator) {
 925                 gfs2_glock_dq_uninit(&sdp->sd_journal_gh);
 926                 gfs2_glock_dq_uninit(&sdp->sd_jinode_gh);
 927                 gfs2_glock_dq_uninit(&sdp->sd_sc_gh);
 928                 gfs2_glock_dq_uninit(&sdp->sd_qc_gh);
 929                 iput(sdp->sd_sc_inode);
 930                 iput(sdp->sd_qc_inode);
 931         }
 932
 933         gfs2_glock_dq_uninit(&sdp->sd_live_gh);
 934         gfs2_clear_rgrpd(sdp);
 935         gfs2_jindex_free(sdp);
 936         /*  Take apart glock structures and buffer lists  */
 937         gfs2_gl_hash_clear(sdp);
 938         gfs2_delete_debugfs_file(sdp);
 939         /*  Unmount the locking protocol  */
 940         gfs2_lm_unmount(sdp);
 941
 942         /*  At this point, we're through participating in the lockspace  */
 943         gfs2_sys_fs_del(sdp);
 944 }
 945
 946 /**
 947  * gfs2_sync_fs - sync the filesystem
 948  * @sb: the superblock
 949  *
 950  * Flushes the log to disk.
 951  */
 952
 953 static int gfs2_sync_fs(struct super_block *sb, int wait)
 954 {
 955         struct gfs2_sbd *sdp = sb->s_fs_info;
 956
 957         gfs2_quota_sync(sb, -1);
 958         if (wait)
 959                 gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_NORMAL |
 960                                GFS2_LFC_SYNC_FS);
 961         return sdp->sd_log_error;
 962 }
 963
 964 void gfs2_freeze_func(struct work_struct *work)
 965 {
 966         int error;
 967         struct gfs2_holder freeze_gh;
 968         struct gfs2_sbd *sdp = container_of(work, struct gfs2_sbd, sd_freeze_work);
 969         struct super_block *sb = sdp->sd_vfs;
 970
 971         atomic_inc(&sb->s_active);
 972         error = gfs2_glock_nq_init(sdp->sd_freeze_gl, LM_ST_SHARED, 0,
 973                                    &freeze_gh);
 974         if (error) {
 975                 printk(KERN_INFO "GFS2: couldn't get freeze lock : %d\n", error);
 976                 gfs2_assert_withdraw(sdp, 0);
 977         }
 978         else {
 979                 atomic_set(&sdp->sd_freeze_state, SFS_UNFROZEN);
 980                 error = thaw_super(sb);
 981                 if (error) {
 982                         printk(KERN_INFO "GFS2: couldn't thaw filesystem: %d\n",
 983                                error);
 984                         gfs2_assert_withdraw(sdp, 0);
 985                 }
 986                 if (!test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags))
 987                         freeze_gh.gh_flags |= GL_NOCACHE;
 988                 gfs2_glock_dq_uninit(&freeze_gh);
 989         }
 990         deactivate_super(sb);
 991         return;
 992 }
 993
 994 /**
 995  * gfs2_freeze - prevent further writes to the filesystem
 996  * @sb: the VFS structure for the filesystem
 997  *
 998  */
 999
1000 static int gfs2_freeze(struct super_block *sb)
1001 {
1002         struct gfs2_sbd *sdp = sb->s_fs_info;
1003         int error = 0;
1004
1005         mutex_lock(&sdp->sd_freeze_mutex);
1006         if (atomic_read(&sdp->sd_freeze_state) != SFS_UNFROZEN)
1007                 goto out;
1008
1009         if (test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) {
1010                 error = -EINVAL;
1011                 goto out;
1012         }
1013
1014         for (;;) {
1015                 error = gfs2_lock_fs_check_clean(sdp, &sdp->sd_freeze_gh);
1016                 if (!error)
1017                         break;
1018
1019                 switch (error) {
1020                 case -EBUSY:
1021                         fs_err(sdp, "waiting for recovery before freeze\n");
1022                         break;
1023
1024                 default:
1025                         fs_err(sdp, "error freezing FS: %d\n", error);
1026                         break;
1027                 }
1028
1029                 fs_err(sdp, "retrying...\n");
1030                 msleep(1000);
1031         }
1032         error = 0;
1033 out:
1034         mutex_unlock(&sdp->sd_freeze_mutex);
1035         return error;
1036 }
1037
1038 /**
1039  * gfs2_unfreeze - reallow writes to the filesystem
1040  * @sb: the VFS structure for the filesystem
1041  *
1042  */
1043
1044 static int gfs2_unfreeze(struct super_block *sb)
1045 {
1046         struct gfs2_sbd *sdp = sb->s_fs_info;
1047
1048         mutex_lock(&sdp->sd_freeze_mutex);
1049         if (atomic_read(&sdp->sd_freeze_state) != SFS_FROZEN ||
1050             !gfs2_holder_initialized(&sdp->sd_freeze_gh)) {
1051                 mutex_unlock(&sdp->sd_freeze_mutex);
1052                 return 0;
1053         }
1054
1055         gfs2_glock_dq_uninit(&sdp->sd_freeze_gh);
1056         mutex_unlock(&sdp->sd_freeze_mutex);
1057         return 0;
1058 }
1059
1060 /**
1061  * statfs_fill - fill in the sg for a given RG
1062  * @rgd: the RG
1063  * @sc: the sc structure
1064  *
1065  * Returns: 0 on success, -ESTALE if the LVB is invalid
1066  */
1067
1068 static int statfs_slow_fill(struct gfs2_rgrpd *rgd,
1069                             struct gfs2_statfs_change_host *sc)
1070 {
1071         gfs2_rgrp_verify(rgd);
1072         sc->sc_total += rgd->rd_data;
1073         sc->sc_free += rgd->rd_free;
1074         sc->sc_dinodes += rgd->rd_dinodes;
1075         return 0;
1076 }
1077
1078 /**
1079  * gfs2_statfs_slow - Stat a filesystem using asynchronous locking
1080  * @sdp: the filesystem
1081  * @sc: the sc info that will be returned
1082  *
1083  * Any error (other than a signal) will cause this routine to fall back
1084  * to the synchronous version.
1085  *
1086  * FIXME: This really shouldn't busy wait like this.
1087  *
1088  * Returns: errno
1089  */
1090
1091 static int gfs2_statfs_slow(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *sc)
1092 {
1093         struct gfs2_rgrpd *rgd_next;
1094         struct gfs2_holder *gha, *gh;
1095         unsigned int slots = 64;
1096         unsigned int x;
1097         int done;
1098         int error = 0, err;
1099
1100         memset(sc, 0, sizeof(struct gfs2_statfs_change_host));
1101         gha = kmalloc_array(slots, sizeof(struct gfs2_holder), GFP_KERNEL);
1102         if (!gha)
1103                 return -ENOMEM;
1104         for (x = 0; x < slots; x++)
1105                 gfs2_holder_mark_uninitialized(gha + x);
1106
1107         rgd_next = gfs2_rgrpd_get_first(sdp);
1108
1109         for (;;) {
1110                 done = 1;
1111
1112                 for (x = 0; x < slots; x++) {
1113                         gh = gha + x;
1114
1115                         if (gfs2_holder_initialized(gh) && gfs2_glock_poll(gh)) {
1116                                 err = gfs2_glock_wait(gh);
1117                                 if (err) {
1118                                         gfs2_holder_uninit(gh);
1119                                         error = err;
1120                                 } else {
1121                                         if (!error) {
1122                                                 struct gfs2_rgrpd *rgd =
1123                                                         gfs2_glock2rgrp(gh->gh_gl);
1124
1125                                                 error = statfs_slow_fill(rgd, sc);
1126                                         }
1127                                         gfs2_glock_dq_uninit(gh);
1128                                 }
1129                         }
1130
1131                         if (gfs2_holder_initialized(gh))
1132                                 done = 0;
1133                         else if (rgd_next && !error) {
1134                                 error = gfs2_glock_nq_init(rgd_next->rd_gl,
1135                                                            LM_ST_SHARED,
1136                                                            GL_ASYNC,
1137                                                            gh);
1138                                 rgd_next = gfs2_rgrpd_get_next(rgd_next);
1139                                 done = 0;
1140                         }
1141
1142                         if (signal_pending(current))
1143                                 error = -ERESTARTSYS;
1144                 }
1145
1146                 if (done)
1147                         break;
1148
1149                 yield();
1150         }
1151
1152         kfree(gha);
1153         return error;
1154 }
1155
1156 /**
1157  * gfs2_statfs_i - Do a statfs
1158  * @sdp: the filesystem
1159  * @sg: the sg structure
1160  *
1161  * Returns: errno
1162  */
1163
1164 static int gfs2_statfs_i(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *sc)
1165 {
1166         struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
1167         struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
1168
1169         spin_lock(&sdp->sd_statfs_spin);
1170
1171         *sc = *m_sc;
1172         sc->sc_total += l_sc->sc_total;
1173         sc->sc_free += l_sc->sc_free;
1174         sc->sc_dinodes += l_sc->sc_dinodes;
1175
1176         spin_unlock(&sdp->sd_statfs_spin);
1177
1178         if (sc->sc_free < 0)
1179                 sc->sc_free = 0;
1180         if (sc->sc_free > sc->sc_total)
1181                 sc->sc_free = sc->sc_total;
1182         if (sc->sc_dinodes < 0)
1183                 sc->sc_dinodes = 0;
1184
1185         return 0;
1186 }
1187
1188 /**
1189  * gfs2_statfs - Gather and return stats about the filesystem
1190  * @sb: The superblock
1191  * @statfsbuf: The buffer
1192  *
1193  * Returns: 0 on success or error code
1194  */
1195
1196 static int gfs2_statfs(struct dentry *dentry, struct kstatfs *buf)
1197 {
1198         struct super_block *sb = dentry->d_sb;
1199         struct gfs2_sbd *sdp = sb->s_fs_info;
1200         struct gfs2_statfs_change_host sc;
1201         int error;
1202
1203         error = gfs2_rindex_update(sdp);
1204         if (error)
1205                 return error;
1206
1207         if (gfs2_tune_get(sdp, gt_statfs_slow))
1208                 error = gfs2_statfs_slow(sdp, &sc);
1209         else
1210                 error = gfs2_statfs_i(sdp, &sc);
1211
1212         if (error)
1213                 return error;
1214
1215         buf->f_type = GFS2_MAGIC;
1216         buf->f_bsize = sdp->sd_sb.sb_bsize;
1217         buf->f_blocks = sc.sc_total;
1218         buf->f_bfree = sc.sc_free;
1219         buf->f_bavail = sc.sc_free;
1220         buf->f_files = sc.sc_dinodes + sc.sc_free;
1221         buf->f_ffree = sc.sc_free;
1222         buf->f_namelen = GFS2_FNAMESIZE;
1223
1224         return 0;
1225 }
1226
1227 /**
1228  * gfs2_remount_fs - called when the FS is remounted
1229  * @sb:  the filesystem
1230  * @flags:  the remount flags
1231  * @data:  extra data passed in (not used right now)
1232  *
1233  * Returns: errno
1234  */
1235
1236 static int gfs2_remount_fs(struct super_block *sb, int *flags, char *data)
1237 {
1238         struct gfs2_sbd *sdp = sb->s_fs_info;
1239         struct gfs2_args args = sdp->sd_args; /* Default to current settings */
1240         struct gfs2_tune *gt = &sdp->sd_tune;
1241         int error;
1242
1243         sync_filesystem(sb);
1244
1245         spin_lock(&gt->gt_spin);
1246         args.ar_commit = gt->gt_logd_secs;
1247         args.ar_quota_quantum = gt->gt_quota_quantum;
1248         if (gt->gt_statfs_slow)
1249                 args.ar_statfs_quantum = 0;
1250         else
1251                 args.ar_statfs_quantum = gt->gt_statfs_quantum;
1252         spin_unlock(&gt->gt_spin);
1253         error = gfs2_mount_args(&args, data);
1254         if (error)
1255                 return error;
1256
1257         /* Not allowed to change locking details */
1258         if (strcmp(args.ar_lockproto, sdp->sd_args.ar_lockproto) ||
1259             strcmp(args.ar_locktable, sdp->sd_args.ar_locktable) ||
1260             strcmp(args.ar_hostdata, sdp->sd_args.ar_hostdata))
1261                 return -EINVAL;
1262
1263         /* Some flags must not be changed */
1264         if (args_neq(&args, &sdp->sd_args, spectator) ||
1265             args_neq(&args, &sdp->sd_args, localflocks) ||
1266             args_neq(&args, &sdp->sd_args, meta))
1267                 return -EINVAL;
1268
1269         if (sdp->sd_args.ar_spectator)
1270                 *flags |= SB_RDONLY;
1271
1272         if ((sb->s_flags ^ *flags) & SB_RDONLY) {
1273                 if (*flags & SB_RDONLY)
1274                         error = gfs2_make_fs_ro(sdp);
1275                 else
1276                         error = gfs2_make_fs_rw(sdp);
1277                 if (error)
1278                         return error;
1279         }
1280
1281         sdp->sd_args = args;
1282         if (sdp->sd_args.ar_posix_acl)
1283                 sb->s_flags |= SB_POSIXACL;
1284         else
1285                 sb->s_flags &= ~SB_POSIXACL;
1286         if (sdp->sd_args.ar_nobarrier)
1287                 set_bit(SDF_NOBARRIERS, &sdp->sd_flags);
1288         else
1289                 clear_bit(SDF_NOBARRIERS, &sdp->sd_flags);
1290         spin_lock(&gt->gt_spin);
1291         gt->gt_logd_secs = args.ar_commit;
1292         gt->gt_quota_quantum = args.ar_quota_quantum;
1293         if (args.ar_statfs_quantum) {
1294                 gt->gt_statfs_slow = 0;
1295                 gt->gt_statfs_quantum = args.ar_statfs_quantum;
1296         }
1297         else {
1298                 gt->gt_statfs_slow = 1;
1299                 gt->gt_statfs_quantum = 30;
1300         }
1301         spin_unlock(&gt->gt_spin);
1302
1303         gfs2_online_uevent(sdp);
1304         return 0;
1305 }
1306
1307 /**
1308  * gfs2_drop_inode - Drop an inode (test for remote unlink)
1309  * @inode: The inode to drop
1310  *
1311  * If we've received a callback on an iopen lock then it's because a
1312  * remote node tried to deallocate the inode but failed due to this node
1313  * still having the inode open. Here we mark the link count zero
1314  * since we know that it must have reached zero if the GLF_DEMOTE flag
1315  * is set on the iopen glock. If we didn't do a disk read since the
1316  * remote node removed the final link then we might otherwise miss
1317  * this event. This check ensures that this node will deallocate the
1318  * inode's blocks, or alternatively pass the baton on to another
1319  * node for later deallocation.
1320  */
1321
1322 static int gfs2_drop_inode(struct inode *inode)
1323 {
1324         struct gfs2_inode *ip = GFS2_I(inode);
1325
1326         if (!test_bit(GIF_FREE_VFS_INODE, &ip->i_flags) &&
1327             inode->i_nlink &&
1328             gfs2_holder_initialized(&ip->i_iopen_gh)) {
1329                 struct gfs2_glock *gl = ip->i_iopen_gh.gh_gl;
1330                 if (test_bit(GLF_DEMOTE, &gl->gl_flags))
1331                         clear_nlink(inode);
1332         }
1333
1334         /*
1335          * When under memory pressure when an inode's link count has dropped to
1336          * zero, defer deleting the inode to the delete workqueue.  This avoids
1337          * calling into DLM under memory pressure, which can deadlock.
1338          */
1339         if (!inode->i_nlink &&
1340             unlikely(current->flags & PF_MEMALLOC) &&
1341             gfs2_holder_initialized(&ip->i_iopen_gh)) {
1342                 struct gfs2_glock *gl = ip->i_iopen_gh.gh_gl;
1343
1344                 gfs2_glock_hold(gl);
1345                 if (queue_work(gfs2_delete_workqueue, &gl->gl_delete) == 0)
1346                         gfs2_glock_queue_put(gl);
1347                 return false;
1348         }
1349
1350         return generic_drop_inode(inode);
1351 }
1352
1353 static int is_ancestor(const struct dentry *d1, const struct dentry *d2)
1354 {
1355         do {
1356                 if (d1 == d2)
1357                         return 1;
1358                 d1 = d1->d_parent;
1359         } while (!IS_ROOT(d1));
1360         return 0;
1361 }
1362
1363 /**
1364  * gfs2_show_options - Show mount options for /proc/mounts
1365  * @s: seq_file structure
1366  * @root: root of this (sub)tree
1367  *
1368  * Returns: 0 on success or error code
1369  */
1370
1371 static int gfs2_show_options(struct seq_file *s, struct dentry *root)
1372 {
1373         struct gfs2_sbd *sdp = root->d_sb->s_fs_info;
1374         struct gfs2_args *args = &sdp->sd_args;
1375         int val;
1376
1377         if (is_ancestor(root, sdp->sd_master_dir))
1378                 seq_puts(s, ",meta");
1379         if (args->ar_lockproto[0])
1380                 seq_show_option(s, "lockproto", args->ar_lockproto);
1381         if (args->ar_locktable[0])
1382                 seq_show_option(s, "locktable", args->ar_locktable);
1383         if (args->ar_hostdata[0])
1384                 seq_show_option(s, "hostdata", args->ar_hostdata);
1385         if (args->ar_spectator)
1386                 seq_puts(s, ",spectator");
1387         if (args->ar_localflocks)
1388                 seq_puts(s, ",localflocks");
1389         if (args->ar_debug)
1390                 seq_puts(s, ",debug");
1391         if (args->ar_posix_acl)
1392                 seq_puts(s, ",acl");
1393         if (args->ar_quota != GFS2_QUOTA_DEFAULT) {
1394                 char *state;
1395                 switch (args->ar_quota) {
1396                 case GFS2_QUOTA_OFF:
1397                         state = "off";
1398                         break;
1399                 case GFS2_QUOTA_ACCOUNT:
1400                         state = "account";
1401                         break;
1402                 case GFS2_QUOTA_ON:
1403                         state = "on";
1404                         break;
1405                 default:
1406                         state = "unknown";
1407                         break;
1408                 }
1409                 seq_printf(s, ",quota=%s", state);
1410         }
1411         if (args->ar_suiddir)
1412                 seq_puts(s, ",suiddir");
1413         if (args->ar_data != GFS2_DATA_DEFAULT) {
1414                 char *state;
1415                 switch (args->ar_data) {
1416                 case GFS2_DATA_WRITEBACK:
1417                         state = "writeback";
1418                         break;
1419                 case GFS2_DATA_ORDERED:
1420                         state = "ordered";
1421                         break;
1422                 default:
1423                         state = "unknown";
1424                         break;
1425                 }
1426                 seq_printf(s, ",data=%s", state);
1427         }
1428         if (args->ar_discard)
1429                 seq_puts(s, ",discard");
1430         val = sdp->sd_tune.gt_logd_secs;
1431         if (val != 30)
1432                 seq_printf(s, ",commit=%d", val);
1433         val = sdp->sd_tune.gt_statfs_quantum;
1434         if (val != 30)
1435                 seq_printf(s, ",statfs_quantum=%d", val);
1436         else if (sdp->sd_tune.gt_statfs_slow)
1437                 seq_puts(s, ",statfs_quantum=0");
1438         val = sdp->sd_tune.gt_quota_quantum;
1439         if (val != 60)
1440                 seq_printf(s, ",quota_quantum=%d", val);
1441         if (args->ar_statfs_percent)
1442                 seq_printf(s, ",statfs_percent=%d", args->ar_statfs_percent);
1443         if (args->ar_errors != GFS2_ERRORS_DEFAULT) {
1444                 const char *state;
1445
1446                 switch (args->ar_errors) {
1447                 case GFS2_ERRORS_WITHDRAW:
1448                         state = "withdraw";
1449                         break;
1450                 case GFS2_ERRORS_PANIC:
1451                         state = "panic";
1452                         break;
1453                 default:
1454                         state = "unknown";
1455                         break;
1456                 }
1457                 seq_printf(s, ",errors=%s", state);
1458         }
1459         if (test_bit(SDF_NOBARRIERS, &sdp->sd_flags))
1460                 seq_puts(s, ",nobarrier");
1461         if (test_bit(SDF_DEMOTE, &sdp->sd_flags))
1462                 seq_puts(s, ",demote_interface_used");
1463         if (args->ar_rgrplvb)
1464                 seq_puts(s, ",rgrplvb");
1465         if (args->ar_loccookie)
1466                 seq_puts(s, ",loccookie");
1467         return 0;
1468 }
1469
1470 static void gfs2_final_release_pages(struct gfs2_inode *ip)
1471 {
1472         struct inode *inode = &ip->i_inode;
1473         struct gfs2_glock *gl = ip->i_gl;
1474
1475         truncate_inode_pages(gfs2_glock2aspace(ip->i_gl), 0);
1476         truncate_inode_pages(&inode->i_data, 0);
1477
1478         if (atomic_read(&gl->gl_revokes) == 0) {
1479                 clear_bit(GLF_LFLUSH, &gl->gl_flags);
1480                 clear_bit(GLF_DIRTY, &gl->gl_flags);
1481         }
1482 }
1483
1484 static int gfs2_dinode_dealloc(struct gfs2_inode *ip)
1485 {
1486         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1487         struct gfs2_rgrpd *rgd;
1488         struct gfs2_holder gh;
1489         int error;
1490
1491         if (gfs2_get_inode_blocks(&ip->i_inode) != 1) {
1492                 gfs2_consist_inode(ip);
1493                 return -EIO;
1494         }
1495
1496         error = gfs2_rindex_update(sdp);
1497         if (error)
1498                 return error;
1499
1500         error = gfs2_quota_hold(ip, NO_UID_QUOTA_CHANGE, NO_GID_QUOTA_CHANGE);
1501         if (error)
1502                 return error;
1503
1504         rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1);
1505         if (!rgd) {
1506                 gfs2_consist_inode(ip);
1507                 error = -EIO;
1508                 goto out_qs;
1509         }
1510
1511         error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &gh);
1512         if (error)
1513                 goto out_qs;
1514
1515         error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS + RES_QUOTA,
1516                                  sdp->sd_jdesc->jd_blocks);
1517         if (error)
1518                 goto out_rg_gunlock;
1519
1520         gfs2_free_di(rgd, ip);
1521
1522         gfs2_final_release_pages(ip);
1523
1524         gfs2_trans_end(sdp);
1525
1526 out_rg_gunlock:
1527         gfs2_glock_dq_uninit(&gh);
1528 out_qs:
1529         gfs2_quota_unhold(ip);
1530         return error;
1531 }
1532
1533 /**
1534  * gfs2_glock_put_eventually
1535  * @gl: The glock to put
1536  *
1537  * When under memory pressure, trigger a deferred glock put to make sure we
1538  * won't call into DLM and deadlock.  Otherwise, put the glock directly.
1539  */
1540
1541 static void gfs2_glock_put_eventually(struct gfs2_glock *gl)
1542 {
1543         if (current->flags & PF_MEMALLOC)
1544                 gfs2_glock_queue_put(gl);
1545         else
1546                 gfs2_glock_put(gl);
1547 }
1548
1549 /**
1550  * gfs2_evict_inode - Remove an inode from cache
1551  * @inode: The inode to evict
1552  *
1553  * There are three cases to consider:
1554  * 1. i_nlink == 0, we are final opener (and must deallocate)
1555  * 2. i_nlink == 0, we are not the final opener (and cannot deallocate)
1556  * 3. i_nlink > 0
1557  *
1558  * If the fs is read only, then we have to treat all cases as per #3
1559  * since we are unable to do any deallocation. The inode will be
1560  * deallocated by the next read/write node to attempt an allocation
1561  * in the same resource group
1562  *
1563  * We have to (at the moment) hold the inodes main lock to cover
1564  * the gap between unlocking the shared lock on the iopen lock and
1565  * taking the exclusive lock. I'd rather do a shared -> exclusive
1566  * conversion on the iopen lock, but we can change that later. This
1567  * is safe, just less efficient.
1568  */
1569
1570 static void gfs2_evict_inode(struct inode *inode)
1571 {
1572         struct super_block *sb = inode->i_sb;
1573         struct gfs2_sbd *sdp = sb->s_fs_info;
1574         struct gfs2_inode *ip = GFS2_I(inode);
1575         struct gfs2_holder gh;
1576         struct address_space *metamapping;
1577         int error;
1578
1579         if (test_bit(GIF_FREE_VFS_INODE, &ip->i_flags)) {
1580                 clear_inode(inode);
1581                 return;
1582         }
1583
1584         if (inode->i_nlink || sb_rdonly(sb))
1585                 goto out;
1586
1587         if (test_bit(GIF_ALLOC_FAILED, &ip->i_flags)) {
1588                 BUG_ON(!gfs2_glock_is_locked_by_me(ip->i_gl));
1589                 gfs2_holder_mark_uninitialized(&gh);
1590                 goto alloc_failed;
1591         }
1592
1593         /* Deletes should never happen under memory pressure anymore.  */
1594         if (WARN_ON_ONCE(current->flags & PF_MEMALLOC))
1595                 goto out;
1596
1597         /* Must not read inode block until block type has been verified */
1598         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, &gh);
1599         if (unlikely(error)) {
1600                 glock_clear_object(ip->i_iopen_gh.gh_gl, ip);
1601                 ip->i_iopen_gh.gh_flags |= GL_NOCACHE;
1602                 gfs2_glock_dq_uninit(&ip->i_iopen_gh);
1603                 goto out;
1604         }
1605
1606         error = gfs2_check_blk_type(sdp, ip->i_no_addr, GFS2_BLKST_UNLINKED);
1607         if (error)
1608                 goto out_truncate;
1609
1610         if (test_bit(GIF_INVALID, &ip->i_flags)) {
1611                 error = gfs2_inode_refresh(ip);
1612                 if (error)
1613                         goto out_truncate;
1614         }
1615
1616         /*
1617          * The inode may have been recreated in the meantime.
1618          */
1619         if (inode->i_nlink)
1620                 goto out_truncate;
1621
1622 alloc_failed:
1623         if (gfs2_holder_initialized(&ip->i_iopen_gh) &&
1624             test_bit(HIF_HOLDER, &ip->i_iopen_gh.gh_iflags)) {
1625                 ip->i_iopen_gh.gh_flags |= GL_NOCACHE;
1626                 gfs2_glock_dq_wait(&ip->i_iopen_gh);
1627                 gfs2_holder_reinit(LM_ST_EXCLUSIVE, LM_FLAG_TRY_1CB | GL_NOCACHE,
1628                                    &ip->i_iopen_gh);
1629                 error = gfs2_glock_nq(&ip->i_iopen_gh);
1630                 if (error)
1631                         goto out_truncate;
1632         }
1633
1634         /* Case 1 starts here */
1635
1636         if (S_ISDIR(inode->i_mode) &&
1637             (ip->i_diskflags & GFS2_DIF_EXHASH)) {
1638                 error = gfs2_dir_exhash_dealloc(ip);
1639                 if (error)
1640                         goto out_unlock;
1641         }
1642
1643         if (ip->i_eattr) {
1644                 error = gfs2_ea_dealloc(ip);
1645                 if (error)
1646                         goto out_unlock;
1647         }
1648
1649         if (!gfs2_is_stuffed(ip)) {
1650                 error = gfs2_file_dealloc(ip);
1651                 if (error)
1652                         goto out_unlock;
1653         }
1654
1655         /* We're about to clear the bitmap for the dinode, but as soon as we
1656            do, gfs2_create_inode can create another inode at the same block
1657            location and try to set gl_object again. We clear gl_object here so
1658            that subsequent inode creates don't see an old gl_object. */
1659         glock_clear_object(ip->i_gl, ip);
1660         error = gfs2_dinode_dealloc(ip);
1661         goto out_unlock;
1662
1663 out_truncate:
1664         gfs2_log_flush(sdp, ip->i_gl, GFS2_LOG_HEAD_FLUSH_NORMAL |
1665                        GFS2_LFC_EVICT_INODE);
1666         metamapping = gfs2_glock2aspace(ip->i_gl);
1667         if (test_bit(GLF_DIRTY, &ip->i_gl->gl_flags)) {
1668                 filemap_fdatawrite(metamapping);
1669                 filemap_fdatawait(metamapping);
1670         }
1671         write_inode_now(inode, 1);
1672         gfs2_ail_flush(ip->i_gl, 0);
1673
1674         /* Case 2 starts here */
1675         error = gfs2_trans_begin(sdp, 0, sdp->sd_jdesc->jd_blocks);
1676         if (error)
1677                 goto out_unlock;
1678         /* Needs to be done before glock release & also in a transaction */
1679         truncate_inode_pages(&inode->i_data, 0);
1680         truncate_inode_pages(metamapping, 0);
1681         gfs2_trans_end(sdp);
1682
1683 out_unlock:
1684         /* Error path for case 1 */
1685         if (gfs2_rs_active(&ip->i_res))
1686                 gfs2_rs_deltree(&ip->i_res);
1687
1688         if (gfs2_holder_initialized(&ip->i_iopen_gh)) {
1689                 glock_clear_object(ip->i_iopen_gh.gh_gl, ip);
1690                 if (test_bit(HIF_HOLDER, &ip->i_iopen_gh.gh_iflags)) {
1691                         ip->i_iopen_gh.gh_flags |= GL_NOCACHE;
1692                         gfs2_glock_dq(&ip->i_iopen_gh);
1693                 }
1694                 gfs2_holder_uninit(&ip->i_iopen_gh);
1695         }
1696         if (gfs2_holder_initialized(&gh)) {
1697                 glock_clear_object(ip->i_gl, ip);
1698                 gfs2_glock_dq_uninit(&gh);
1699         }
1700         if (error && error != GLR_TRYFAILED && error != -EROFS)
1701                 fs_warn(sdp, "gfs2_evict_inode: %d\n", error);
1702 out:
1703         /* Case 3 starts here */
1704         truncate_inode_pages_final(&inode->i_data);
1705         gfs2_rsqa_delete(ip, NULL);
1706         gfs2_ordered_del_inode(ip);
1707         clear_inode(inode);
1708         gfs2_dir_hash_inval(ip);
1709         glock_clear_object(ip->i_gl, ip);
1710         wait_on_bit_io(&ip->i_flags, GIF_GLOP_PENDING, TASK_UNINTERRUPTIBLE);
1711         gfs2_glock_add_to_lru(ip->i_gl);
1712         gfs2_glock_put_eventually(ip->i_gl);
1713         ip->i_gl = NULL;
1714         if (gfs2_holder_initialized(&ip->i_iopen_gh)) {
1715                 struct gfs2_glock *gl = ip->i_iopen_gh.gh_gl;
1716
1717                 glock_clear_object(gl, ip);
1718                 ip->i_iopen_gh.gh_flags |= GL_NOCACHE;
1719                 gfs2_glock_hold(gl);
1720                 gfs2_glock_dq_uninit(&ip->i_iopen_gh);
1721                 gfs2_glock_put_eventually(gl);
1722         }
1723 }
1724
1725 static struct inode *gfs2_alloc_inode(struct super_block *sb)
1726 {
1727         struct gfs2_inode *ip;
1728
1729         ip = kmem_cache_alloc(gfs2_inode_cachep, GFP_KERNEL);
1730         if (ip) {
1731                 ip->i_flags = 0;
1732                 ip->i_gl = NULL;
1733                 memset(&ip->i_res, 0, sizeof(ip->i_res));
1734                 RB_CLEAR_NODE(&ip->i_res.rs_node);
1735                 ip->i_rahead = 0;
1736         }
1737         return &ip->i_inode;
1738 }
1739
1740 static void gfs2_i_callback(struct rcu_head *head)
1741 {
1742         struct inode *inode = container_of(head, struct inode, i_rcu);
1743         kmem_cache_free(gfs2_inode_cachep, inode);
1744 }
1745
1746 static void gfs2_destroy_inode(struct inode *inode)
1747 {
1748         call_rcu(&inode->i_rcu, gfs2_i_callback);
1749 }
1750
1751 const struct super_operations gfs2_super_ops = {
1752         .alloc_inode            = gfs2_alloc_inode,
1753         .destroy_inode          = gfs2_destroy_inode,
1754         .write_inode            = gfs2_write_inode,
1755         .dirty_inode            = gfs2_dirty_inode,
1756         .evict_inode            = gfs2_evict_inode,
1757         .put_super              = gfs2_put_super,
1758         .sync_fs                = gfs2_sync_fs,
1759         .freeze_super           = gfs2_freeze,
1760         .thaw_super             = gfs2_unfreeze,
1761         .statfs                 = gfs2_statfs,
1762         .remount_fs             = gfs2_remount_fs,
1763         .drop_inode             = gfs2_drop_inode,
1764         .show_options           = gfs2_show_options,
1765 };
1766