fs/gfs2/super.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
   4  * Copyright (C) 2004-2007 Red Hat, Inc.  All rights reserved.
   5  */
   6
   7 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
   8
   9 #include <linux/bio.h>
  10 #include <linux/sched/signal.h>
  11 #include <linux/slab.h>
  12 #include <linux/spinlock.h>
  13 #include <linux/completion.h>
  14 #include <linux/buffer_head.h>
  15 #include <linux/statfs.h>
  16 #include <linux/seq_file.h>
  17 #include <linux/mount.h>
  18 #include <linux/kthread.h>
  19 #include <linux/delay.h>
  20 #include <linux/gfs2_ondisk.h>
  21 #include <linux/crc32.h>
  22 #include <linux/time.h>
  23 #include <linux/wait.h>
  24 #include <linux/writeback.h>
  25 #include <linux/backing-dev.h>
  26 #include <linux/kernel.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 #include "lops.h"
  46
  47 #define args_neq(a1, a2, x) ((a1)->ar_##x != (a2)->ar_##x)
  48
  49 enum {
  50         Opt_lockproto,
  51         Opt_locktable,
  52         Opt_hostdata,
  53         Opt_spectator,
  54         Opt_ignore_local_fs,
  55         Opt_localflocks,
  56         Opt_localcaching,
  57         Opt_debug,
  58         Opt_nodebug,
  59         Opt_upgrade,
  60         Opt_acl,
  61         Opt_noacl,
  62         Opt_quota_off,
  63         Opt_quota_account,
  64         Opt_quota_on,
  65         Opt_quota,
  66         Opt_noquota,
  67         Opt_suiddir,
  68         Opt_nosuiddir,
  69         Opt_data_writeback,
  70         Opt_data_ordered,
  71         Opt_meta,
  72         Opt_discard,
  73         Opt_nodiscard,
  74         Opt_commit,
  75         Opt_err_withdraw,
  76         Opt_err_panic,
  77         Opt_statfs_quantum,
  78         Opt_statfs_percent,
  79         Opt_quota_quantum,
  80         Opt_barrier,
  81         Opt_nobarrier,
  82         Opt_rgrplvb,
  83         Opt_norgrplvb,
  84         Opt_loccookie,
  85         Opt_noloccookie,
  86         Opt_error,
  87 };
  88
  89 static const match_table_t tokens = {
  90         {Opt_lockproto, "lockproto=%s"},
  91         {Opt_locktable, "locktable=%s"},
  92         {Opt_hostdata, "hostdata=%s"},
  93         {Opt_spectator, "spectator"},
  94         {Opt_spectator, "norecovery"},
  95         {Opt_ignore_local_fs, "ignore_local_fs"},
  96         {Opt_localflocks, "localflocks"},
  97         {Opt_localcaching, "localcaching"},
  98         {Opt_debug, "debug"},
  99         {Opt_nodebug, "nodebug"},
 100         {Opt_upgrade, "upgrade"},
 101         {Opt_acl, "acl"},
 102         {Opt_noacl, "noacl"},
 103         {Opt_quota_off, "quota=off"},
 104         {Opt_quota_account, "quota=account"},
 105         {Opt_quota_on, "quota=on"},
 106         {Opt_quota, "quota"},
 107         {Opt_noquota, "noquota"},
 108         {Opt_suiddir, "suiddir"},
 109         {Opt_nosuiddir, "nosuiddir"},
 110         {Opt_data_writeback, "data=writeback"},
 111         {Opt_data_ordered, "data=ordered"},
 112         {Opt_meta, "meta"},
 113         {Opt_discard, "discard"},
 114         {Opt_nodiscard, "nodiscard"},
 115         {Opt_commit, "commit=%d"},
 116         {Opt_err_withdraw, "errors=withdraw"},
 117         {Opt_err_panic, "errors=panic"},
 118         {Opt_statfs_quantum, "statfs_quantum=%d"},
 119         {Opt_statfs_percent, "statfs_percent=%d"},
 120         {Opt_quota_quantum, "quota_quantum=%d"},
 121         {Opt_barrier, "barrier"},
 122         {Opt_nobarrier, "nobarrier"},
 123         {Opt_rgrplvb, "rgrplvb"},
 124         {Opt_norgrplvb, "norgrplvb"},
 125         {Opt_loccookie, "loccookie"},
 126         {Opt_noloccookie, "noloccookie"},
 127         {Opt_error, NULL}
 128 };
 129
 130 /**
 131  * gfs2_mount_args - Parse mount options
 132  * @args: The structure into which the parsed options will be written
 133  * @options: The options to parse
 134  *
 135  * Return: errno
 136  */
 137
 138 int gfs2_mount_args(struct gfs2_args *args, char *options)
 139 {
 140         char *o;
 141         int token;
 142         substring_t tmp[MAX_OPT_ARGS];
 143         int rv;
 144
 145         /* Split the options into tokens with the "," character and
 146            process them */
 147
 148         while (1) {
 149                 o = strsep(&options, ",");
 150                 if (o == NULL)
 151                         break;
 152                 if (*o == '\0')
 153                         continue;
 154
 155                 token = match_token(o, tokens, tmp);
 156                 switch (token) {
 157                 case Opt_lockproto:
 158                         match_strlcpy(args->ar_lockproto, &tmp[0],
 159                                       GFS2_LOCKNAME_LEN);
 160                         break;
 161                 case Opt_locktable:
 162                         match_strlcpy(args->ar_locktable, &tmp[0],
 163                                       GFS2_LOCKNAME_LEN);
 164                         break;
 165                 case Opt_hostdata:
 166                         match_strlcpy(args->ar_hostdata, &tmp[0],
 167                                       GFS2_LOCKNAME_LEN);
 168                         break;
 169                 case Opt_spectator:
 170                         args->ar_spectator = 1;
 171                         break;
 172                 case Opt_ignore_local_fs:
 173                         /* Retained for backwards compat only */
 174                         break;
 175                 case Opt_localflocks:
 176                         args->ar_localflocks = 1;
 177                         break;
 178                 case Opt_localcaching:
 179                         /* Retained for backwards compat only */
 180                         break;
 181                 case Opt_debug:
 182                         if (args->ar_errors == GFS2_ERRORS_PANIC) {
 183                                 pr_warn("-o debug and -o errors=panic are mutually exclusive\n");
 184                                 return -EINVAL;
 185                         }
 186                         args->ar_debug = 1;
 187                         break;
 188                 case Opt_nodebug:
 189                         args->ar_debug = 0;
 190                         break;
 191                 case Opt_upgrade:
 192                         /* Retained for backwards compat only */
 193                         break;
 194                 case Opt_acl:
 195                         args->ar_posix_acl = 1;
 196                         break;
 197                 case Opt_noacl:
 198                         args->ar_posix_acl = 0;
 199                         break;
 200                 case Opt_quota_off:
 201                 case Opt_noquota:
 202                         args->ar_quota = GFS2_QUOTA_OFF;
 203                         break;
 204                 case Opt_quota_account:
 205                         args->ar_quota = GFS2_QUOTA_ACCOUNT;
 206                         break;
 207                 case Opt_quota_on:
 208                 case Opt_quota:
 209                         args->ar_quota = GFS2_QUOTA_ON;
 210                         break;
 211                 case Opt_suiddir:
 212                         args->ar_suiddir = 1;
 213                         break;
 214                 case Opt_nosuiddir:
 215                         args->ar_suiddir = 0;
 216                         break;
 217                 case Opt_data_writeback:
 218                         args->ar_data = GFS2_DATA_WRITEBACK;
 219                         break;
 220                 case Opt_data_ordered:
 221                         args->ar_data = GFS2_DATA_ORDERED;
 222                         break;
 223                 case Opt_meta:
 224                         args->ar_meta = 1;
 225                         break;
 226                 case Opt_discard:
 227                         args->ar_discard = 1;
 228                         break;
 229                 case Opt_nodiscard:
 230                         args->ar_discard = 0;
 231                         break;
 232                 case Opt_commit:
 233                         rv = match_int(&tmp[0], &args->ar_commit);
 234                         if (rv || args->ar_commit <= 0) {
 235                                 pr_warn("commit mount option requires a positive numeric argument\n");
 236                                 return rv ? rv : -EINVAL;
 237                         }
 238                         break;
 239                 case Opt_statfs_quantum:
 240                         rv = match_int(&tmp[0], &args->ar_statfs_quantum);
 241                         if (rv || args->ar_statfs_quantum < 0) {
 242                                 pr_warn("statfs_quantum mount option requires a non-negative numeric argument\n");
 243                                 return rv ? rv : -EINVAL;
 244                         }
 245                         break;
 246                 case Opt_quota_quantum:
 247                         rv = match_int(&tmp[0], &args->ar_quota_quantum);
 248                         if (rv || args->ar_quota_quantum <= 0) {
 249                                 pr_warn("quota_quantum mount option requires a positive numeric argument\n");
 250                                 return rv ? rv : -EINVAL;
 251                         }
 252                         break;
 253                 case Opt_statfs_percent:
 254                         rv = match_int(&tmp[0], &args->ar_statfs_percent);
 255                         if (rv || args->ar_statfs_percent < 0 ||
 256                             args->ar_statfs_percent > 100) {
 257                                 pr_warn("statfs_percent mount option requires a numeric argument between 0 and 100\n");
 258                                 return rv ? rv : -EINVAL;
 259                         }
 260                         break;
 261                 case Opt_err_withdraw:
 262                         args->ar_errors = GFS2_ERRORS_WITHDRAW;
 263                         break;
 264                 case Opt_err_panic:
 265                         if (args->ar_debug) {
 266                                 pr_warn("-o debug and -o errors=panic are mutually exclusive\n");
 267                                 return -EINVAL;
 268                         }
 269                         args->ar_errors = GFS2_ERRORS_PANIC;
 270                         break;
 271                 case Opt_barrier:
 272                         args->ar_nobarrier = 0;
 273                         break;
 274                 case Opt_nobarrier:
 275                         args->ar_nobarrier = 1;
 276                         break;
 277                 case Opt_rgrplvb:
 278                         args->ar_rgrplvb = 1;
 279                         break;
 280                 case Opt_norgrplvb:
 281                         args->ar_rgrplvb = 0;
 282                         break;
 283                 case Opt_loccookie:
 284                         args->ar_loccookie = 1;
 285                         break;
 286                 case Opt_noloccookie:
 287                         args->ar_loccookie = 0;
 288                         break;
 289                 case Opt_error:
 290                 default:
 291                         pr_warn("invalid mount option: %s\n", o);
 292                         return -EINVAL;
 293                 }
 294         }
 295
 296         return 0;
 297 }
 298
 299 /**
 300  * gfs2_jindex_free - Clear all the journal index information
 301  * @sdp: The GFS2 superblock
 302  *
 303  */
 304
 305 void gfs2_jindex_free(struct gfs2_sbd *sdp)
 306 {
 307         struct list_head list;
 308         struct gfs2_jdesc *jd;
 309
 310         spin_lock(&sdp->sd_jindex_spin);
 311         list_add(&list, &sdp->sd_jindex_list);
 312         list_del_init(&sdp->sd_jindex_list);
 313         sdp->sd_journals = 0;
 314         spin_unlock(&sdp->sd_jindex_spin);
 315
 316         while (!list_empty(&list)) {
 317                 jd = list_entry(list.next, struct gfs2_jdesc, jd_list);
 318                 gfs2_free_journal_extents(jd);
 319                 list_del(&jd->jd_list);
 320                 iput(jd->jd_inode);
 321                 kfree(jd);
 322         }
 323 }
 324
 325 static struct gfs2_jdesc *jdesc_find_i(struct list_head *head, unsigned int jid)
 326 {
 327         struct gfs2_jdesc *jd;
 328         int found = 0;
 329
 330         list_for_each_entry(jd, head, jd_list) {
 331                 if (jd->jd_jid == jid) {
 332                         found = 1;
 333                         break;
 334                 }
 335         }
 336
 337         if (!found)
 338                 jd = NULL;
 339
 340         return jd;
 341 }
 342
 343 struct gfs2_jdesc *gfs2_jdesc_find(struct gfs2_sbd *sdp, unsigned int jid)
 344 {
 345         struct gfs2_jdesc *jd;
 346
 347         spin_lock(&sdp->sd_jindex_spin);
 348         jd = jdesc_find_i(&sdp->sd_jindex_list, jid);
 349         spin_unlock(&sdp->sd_jindex_spin);
 350
 351         return jd;
 352 }
 353
 354 int gfs2_jdesc_check(struct gfs2_jdesc *jd)
 355 {
 356         struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
 357         struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
 358         u64 size = i_size_read(jd->jd_inode);
 359
 360         if (gfs2_check_internal_file_size(jd->jd_inode, 8 << 20, BIT(30)))
 361                 return -EIO;
 362
 363         jd->jd_blocks = size >> sdp->sd_sb.sb_bsize_shift;
 364
 365         if (gfs2_write_alloc_required(ip, 0, size)) {
 366                 gfs2_consist_inode(ip);
 367                 return -EIO;
 368         }
 369
 370         return 0;
 371 }
 372
 373 static int init_threads(struct gfs2_sbd *sdp)
 374 {
 375         struct task_struct *p;
 376         int error = 0;
 377
 378         p = kthread_run(gfs2_logd, sdp, "gfs2_logd");
 379         if (IS_ERR(p)) {
 380                 error = PTR_ERR(p);
 381                 fs_err(sdp, "can't start logd thread: %d\n", error);
 382                 return error;
 383         }
 384         sdp->sd_logd_process = p;
 385
 386         p = kthread_run(gfs2_quotad, sdp, "gfs2_quotad");
 387         if (IS_ERR(p)) {
 388                 error = PTR_ERR(p);
 389                 fs_err(sdp, "can't start quotad thread: %d\n", error);
 390                 goto fail;
 391         }
 392         sdp->sd_quotad_process = p;
 393         return 0;
 394
 395 fail:
 396         kthread_stop(sdp->sd_logd_process);
 397         sdp->sd_logd_process = NULL;
 398         return error;
 399 }
 400
 401 /**
 402  * gfs2_make_fs_rw - Turn a Read-Only FS into a Read-Write one
 403  * @sdp: the filesystem
 404  *
 405  * Returns: errno
 406  */
 407
 408 int gfs2_make_fs_rw(struct gfs2_sbd *sdp)
 409 {
 410         struct gfs2_inode *ip = GFS2_I(sdp->sd_jdesc->jd_inode);
 411         struct gfs2_glock *j_gl = ip->i_gl;
 412         struct gfs2_holder freeze_gh;
 413         struct gfs2_log_header_host head;
 414         int error;
 415
 416         error = init_threads(sdp);
 417         if (error)
 418                 return error;
 419
 420         error = gfs2_glock_nq_init(sdp->sd_freeze_gl, LM_ST_SHARED, 0,
 421                                    &freeze_gh);
 422         if (error)
 423                 goto fail_threads;
 424
 425         j_gl->gl_ops->go_inval(j_gl, DIO_METADATA);
 426
 427         error = gfs2_find_jhead(sdp->sd_jdesc, &head, false);
 428         if (error)
 429                 goto fail;
 430
 431         if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) {
 432                 gfs2_consist(sdp);
 433                 error = -EIO;
 434                 goto fail;
 435         }
 436
 437         /*  Initialize some head of the log stuff  */
 438         sdp->sd_log_sequence = head.lh_sequence + 1;
 439         gfs2_log_pointers_init(sdp, head.lh_blkno);
 440
 441         error = gfs2_quota_init(sdp);
 442         if (error)
 443                 goto fail;
 444
 445         set_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags);
 446
 447         gfs2_glock_dq_uninit(&freeze_gh);
 448
 449         return 0;
 450
 451 fail:
 452         freeze_gh.gh_flags |= GL_NOCACHE;
 453         gfs2_glock_dq_uninit(&freeze_gh);
 454 fail_threads:
 455         if (sdp->sd_quotad_process)
 456                 kthread_stop(sdp->sd_quotad_process);
 457         sdp->sd_quotad_process = NULL;
 458         if (sdp->sd_logd_process)
 459                 kthread_stop(sdp->sd_logd_process);
 460         sdp->sd_logd_process = NULL;
 461         return error;
 462 }
 463
 464 void gfs2_statfs_change_in(struct gfs2_statfs_change_host *sc, const void *buf)
 465 {
 466         const struct gfs2_statfs_change *str = buf;
 467
 468         sc->sc_total = be64_to_cpu(str->sc_total);
 469         sc->sc_free = be64_to_cpu(str->sc_free);
 470         sc->sc_dinodes = be64_to_cpu(str->sc_dinodes);
 471 }
 472
 473 static void gfs2_statfs_change_out(const struct gfs2_statfs_change_host *sc, void *buf)
 474 {
 475         struct gfs2_statfs_change *str = buf;
 476
 477         str->sc_total = cpu_to_be64(sc->sc_total);
 478         str->sc_free = cpu_to_be64(sc->sc_free);
 479         str->sc_dinodes = cpu_to_be64(sc->sc_dinodes);
 480 }
 481
 482 int gfs2_statfs_init(struct gfs2_sbd *sdp)
 483 {
 484         struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
 485         struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
 486         struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
 487         struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
 488         struct buffer_head *m_bh, *l_bh;
 489         struct gfs2_holder gh;
 490         int error;
 491
 492         error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE,
 493                                    &gh);
 494         if (error)
 495                 return error;
 496
 497         error = gfs2_meta_inode_buffer(m_ip, &m_bh);
 498         if (error)
 499                 goto out;
 500
 501         if (sdp->sd_args.ar_spectator) {
 502                 spin_lock(&sdp->sd_statfs_spin);
 503                 gfs2_statfs_change_in(m_sc, m_bh->b_data +
 504                                       sizeof(struct gfs2_dinode));
 505                 spin_unlock(&sdp->sd_statfs_spin);
 506         } else {
 507                 error = gfs2_meta_inode_buffer(l_ip, &l_bh);
 508                 if (error)
 509                         goto out_m_bh;
 510
 511                 spin_lock(&sdp->sd_statfs_spin);
 512                 gfs2_statfs_change_in(m_sc, m_bh->b_data +
 513                                       sizeof(struct gfs2_dinode));
 514                 gfs2_statfs_change_in(l_sc, l_bh->b_data +
 515                                       sizeof(struct gfs2_dinode));
 516                 spin_unlock(&sdp->sd_statfs_spin);
 517
 518                 brelse(l_bh);
 519         }
 520
 521 out_m_bh:
 522         brelse(m_bh);
 523 out:
 524         gfs2_glock_dq_uninit(&gh);
 525         return 0;
 526 }
 527
 528 void gfs2_statfs_change(struct gfs2_sbd *sdp, s64 total, s64 free,
 529                         s64 dinodes)
 530 {
 531         struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
 532         struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
 533         struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
 534         struct buffer_head *l_bh;
 535         s64 x, y;
 536         int need_sync = 0;
 537         int error;
 538
 539         error = gfs2_meta_inode_buffer(l_ip, &l_bh);
 540         if (error)
 541                 return;
 542
 543         gfs2_trans_add_meta(l_ip->i_gl, l_bh);
 544
 545         spin_lock(&sdp->sd_statfs_spin);
 546         l_sc->sc_total += total;
 547         l_sc->sc_free += free;
 548         l_sc->sc_dinodes += dinodes;
 549         gfs2_statfs_change_out(l_sc, l_bh->b_data + sizeof(struct gfs2_dinode));
 550         if (sdp->sd_args.ar_statfs_percent) {
 551                 x = 100 * l_sc->sc_free;
 552                 y = m_sc->sc_free * sdp->sd_args.ar_statfs_percent;
 553                 if (x >= y || x <= -y)
 554                         need_sync = 1;
 555         }
 556         spin_unlock(&sdp->sd_statfs_spin);
 557
 558         brelse(l_bh);
 559         if (need_sync)
 560                 gfs2_wake_up_statfs(sdp);
 561 }
 562
 563 void update_statfs(struct gfs2_sbd *sdp, struct buffer_head *m_bh,
 564                    struct buffer_head *l_bh)
 565 {
 566         struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
 567         struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
 568         struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
 569         struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
 570
 571         gfs2_trans_add_meta(l_ip->i_gl, l_bh);
 572         gfs2_trans_add_meta(m_ip->i_gl, m_bh);
 573
 574         spin_lock(&sdp->sd_statfs_spin);
 575         m_sc->sc_total += l_sc->sc_total;
 576         m_sc->sc_free += l_sc->sc_free;
 577         m_sc->sc_dinodes += l_sc->sc_dinodes;
 578         memset(l_sc, 0, sizeof(struct gfs2_statfs_change));
 579         memset(l_bh->b_data + sizeof(struct gfs2_dinode),
 580                0, sizeof(struct gfs2_statfs_change));
 581         gfs2_statfs_change_out(m_sc, m_bh->b_data + sizeof(struct gfs2_dinode));
 582         spin_unlock(&sdp->sd_statfs_spin);
 583 }
 584
 585 int gfs2_statfs_sync(struct super_block *sb, int type)
 586 {
 587         struct gfs2_sbd *sdp = sb->s_fs_info;
 588         struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
 589         struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
 590         struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
 591         struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
 592         struct gfs2_holder gh;
 593         struct buffer_head *m_bh, *l_bh;
 594         int error;
 595
 596         sb_start_write(sb);
 597         error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE,
 598                                    &gh);
 599         if (error)
 600                 goto out;
 601
 602         error = gfs2_meta_inode_buffer(m_ip, &m_bh);
 603         if (error)
 604                 goto out_unlock;
 605
 606         spin_lock(&sdp->sd_statfs_spin);
 607         gfs2_statfs_change_in(m_sc, m_bh->b_data +
 608                               sizeof(struct gfs2_dinode));
 609         if (!l_sc->sc_total && !l_sc->sc_free && !l_sc->sc_dinodes) {
 610                 spin_unlock(&sdp->sd_statfs_spin);
 611                 goto out_bh;
 612         }
 613         spin_unlock(&sdp->sd_statfs_spin);
 614
 615         error = gfs2_meta_inode_buffer(l_ip, &l_bh);
 616         if (error)
 617                 goto out_bh;
 618
 619         error = gfs2_trans_begin(sdp, 2 * RES_DINODE, 0);
 620         if (error)
 621                 goto out_bh2;
 622
 623         update_statfs(sdp, m_bh, l_bh);
 624         sdp->sd_statfs_force_sync = 0;
 625
 626         gfs2_trans_end(sdp);
 627
 628 out_bh2:
 629         brelse(l_bh);
 630 out_bh:
 631         brelse(m_bh);
 632 out_unlock:
 633         gfs2_glock_dq_uninit(&gh);
 634 out:
 635         sb_end_write(sb);
 636         return error;
 637 }
 638
 639 struct lfcc {
 640         struct list_head list;
 641         struct gfs2_holder gh;
 642 };
 643
 644 /**
 645  * gfs2_lock_fs_check_clean - Stop all writes to the FS and check that all
 646  *                            journals are clean
 647  * @sdp: the file system
 648  * @state: the state to put the transaction lock into
 649  * @t_gh: the hold on the transaction lock
 650  *
 651  * Returns: errno
 652  */
 653
 654 static int gfs2_lock_fs_check_clean(struct gfs2_sbd *sdp,
 655                                     struct gfs2_holder *freeze_gh)
 656 {
 657         struct gfs2_inode *ip;
 658         struct gfs2_jdesc *jd;
 659         struct lfcc *lfcc;
 660         LIST_HEAD(list);
 661         struct gfs2_log_header_host lh;
 662         int error;
 663
 664         list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
 665                 lfcc = kmalloc(sizeof(struct lfcc), GFP_KERNEL);
 666                 if (!lfcc) {
 667                         error = -ENOMEM;
 668                         goto out;
 669                 }
 670                 ip = GFS2_I(jd->jd_inode);
 671                 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &lfcc->gh);
 672                 if (error) {
 673                         kfree(lfcc);
 674                         goto out;
 675                 }
 676                 list_add(&lfcc->list, &list);
 677         }
 678
 679         error = gfs2_glock_nq_init(sdp->sd_freeze_gl, LM_ST_EXCLUSIVE,
 680                                    GL_NOCACHE, freeze_gh);
 681
 682         list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
 683                 error = gfs2_jdesc_check(jd);
 684                 if (error)
 685                         break;
 686                 error = gfs2_find_jhead(jd, &lh, false);
 687                 if (error)
 688                         break;
 689                 if (!(lh.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) {
 690                         error = -EBUSY;
 691                         break;
 692                 }
 693         }
 694
 695         if (error)
 696                 gfs2_glock_dq_uninit(freeze_gh);
 697
 698 out:
 699         while (!list_empty(&list)) {
 700                 lfcc = list_entry(list.next, struct lfcc, list);
 701                 list_del(&lfcc->list);
 702                 gfs2_glock_dq_uninit(&lfcc->gh);
 703                 kfree(lfcc);
 704         }
 705         return error;
 706 }
 707
 708 void gfs2_dinode_out(const struct gfs2_inode *ip, void *buf)
 709 {
 710         struct gfs2_dinode *str = buf;
 711
 712         str->di_header.mh_magic = cpu_to_be32(GFS2_MAGIC);
 713         str->di_header.mh_type = cpu_to_be32(GFS2_METATYPE_DI);
 714         str->di_header.mh_format = cpu_to_be32(GFS2_FORMAT_DI);
 715         str->di_num.no_addr = cpu_to_be64(ip->i_no_addr);
 716         str->di_num.no_formal_ino = cpu_to_be64(ip->i_no_formal_ino);
 717         str->di_mode = cpu_to_be32(ip->i_inode.i_mode);
 718         str->di_uid = cpu_to_be32(i_uid_read(&ip->i_inode));
 719         str->di_gid = cpu_to_be32(i_gid_read(&ip->i_inode));
 720         str->di_nlink = cpu_to_be32(ip->i_inode.i_nlink);
 721         str->di_size = cpu_to_be64(i_size_read(&ip->i_inode));
 722         str->di_blocks = cpu_to_be64(gfs2_get_inode_blocks(&ip->i_inode));
 723         str->di_atime = cpu_to_be64(ip->i_inode.i_atime.tv_sec);
 724         str->di_mtime = cpu_to_be64(ip->i_inode.i_mtime.tv_sec);
 725         str->di_ctime = cpu_to_be64(ip->i_inode.i_ctime.tv_sec);
 726
 727         str->di_goal_meta = cpu_to_be64(ip->i_goal);
 728         str->di_goal_data = cpu_to_be64(ip->i_goal);
 729         str->di_generation = cpu_to_be64(ip->i_generation);
 730
 731         str->di_flags = cpu_to_be32(ip->i_diskflags);
 732         str->di_height = cpu_to_be16(ip->i_height);
 733         str->di_payload_format = cpu_to_be32(S_ISDIR(ip->i_inode.i_mode) &&
 734                                              !(ip->i_diskflags & GFS2_DIF_EXHASH) ?
 735                                              GFS2_FORMAT_DE : 0);
 736         str->di_depth = cpu_to_be16(ip->i_depth);
 737         str->di_entries = cpu_to_be32(ip->i_entries);
 738
 739         str->di_eattr = cpu_to_be64(ip->i_eattr);
 740         str->di_atime_nsec = cpu_to_be32(ip->i_inode.i_atime.tv_nsec);
 741         str->di_mtime_nsec = cpu_to_be32(ip->i_inode.i_mtime.tv_nsec);
 742         str->di_ctime_nsec = cpu_to_be32(ip->i_inode.i_ctime.tv_nsec);
 743 }
 744
 745 /**
 746  * gfs2_write_inode - Make sure the inode is stable on the disk
 747  * @inode: The inode
 748  * @wbc: The writeback control structure
 749  *
 750  * Returns: errno
 751  */
 752
 753 static int gfs2_write_inode(struct inode *inode, struct writeback_control *wbc)
 754 {
 755         struct gfs2_inode *ip = GFS2_I(inode);
 756         struct gfs2_sbd *sdp = GFS2_SB(inode);
 757         struct address_space *metamapping = gfs2_glock2aspace(ip->i_gl);
 758         struct backing_dev_info *bdi = inode_to_bdi(metamapping->host);
 759         int ret = 0;
 760         bool flush_all = (wbc->sync_mode == WB_SYNC_ALL || gfs2_is_jdata(ip));
 761
 762         if (flush_all)
 763                 gfs2_log_flush(GFS2_SB(inode), ip->i_gl,
 764                                GFS2_LOG_HEAD_FLUSH_NORMAL |
 765                                GFS2_LFC_WRITE_INODE);
 766         if (bdi->wb.dirty_exceeded)
 767                 gfs2_ail1_flush(sdp, wbc);
 768         else
 769                 filemap_fdatawrite(metamapping);
 770         if (flush_all)
 771                 ret = filemap_fdatawait(metamapping);
 772         if (ret)
 773                 mark_inode_dirty_sync(inode);
 774         else {
 775                 spin_lock(&inode->i_lock);
 776                 if (!(inode->i_flags & I_DIRTY))
 777                         gfs2_ordered_del_inode(ip);
 778                 spin_unlock(&inode->i_lock);
 779         }
 780         return ret;
 781 }
 782
 783 /**
 784  * gfs2_dirty_inode - check for atime updates
 785  * @inode: The inode in question
 786  * @flags: The type of dirty
 787  *
 788  * Unfortunately it can be called under any combination of inode
 789  * glock and transaction lock, so we have to check carefully.
 790  *
 791  * At the moment this deals only with atime - it should be possible
 792  * to expand that role in future, once a review of the locking has
 793  * been carried out.
 794  */
 795
 796 static void gfs2_dirty_inode(struct inode *inode, int flags)
 797 {
 798         struct gfs2_inode *ip = GFS2_I(inode);
 799         struct gfs2_sbd *sdp = GFS2_SB(inode);
 800         struct buffer_head *bh;
 801         struct gfs2_holder gh;
 802         int need_unlock = 0;
 803         int need_endtrans = 0;
 804         int ret;
 805
 806         if (!(flags & I_DIRTY_INODE))
 807                 return;
 808         if (unlikely(test_bit(SDF_WITHDRAWN, &sdp->sd_flags)))
 809                 return;
 810         if (!gfs2_glock_is_locked_by_me(ip->i_gl)) {
 811                 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
 812                 if (ret) {
 813                         fs_err(sdp, "dirty_inode: glock %d\n", ret);
 814                         return;
 815                 }
 816                 need_unlock = 1;
 817         } else if (WARN_ON_ONCE(ip->i_gl->gl_state != LM_ST_EXCLUSIVE))
 818                 return;
 819
 820         if (current->journal_info == NULL) {
 821                 ret = gfs2_trans_begin(sdp, RES_DINODE, 0);
 822                 if (ret) {
 823                         fs_err(sdp, "dirty_inode: gfs2_trans_begin %d\n", ret);
 824                         goto out;
 825                 }
 826                 need_endtrans = 1;
 827         }
 828
 829         ret = gfs2_meta_inode_buffer(ip, &bh);
 830         if (ret == 0) {
 831                 gfs2_trans_add_meta(ip->i_gl, bh);
 832                 gfs2_dinode_out(ip, bh->b_data);
 833                 brelse(bh);
 834         }
 835
 836         if (need_endtrans)
 837                 gfs2_trans_end(sdp);
 838 out:
 839         if (need_unlock)
 840                 gfs2_glock_dq_uninit(&gh);
 841 }
 842
 843 /**
 844  * gfs2_make_fs_ro - Turn a Read-Write FS into a Read-Only one
 845  * @sdp: the filesystem
 846  *
 847  * Returns: errno
 848  */
 849
 850 static int gfs2_make_fs_ro(struct gfs2_sbd *sdp)
 851 {
 852         struct gfs2_holder freeze_gh;
 853         int error;
 854
 855         error = gfs2_glock_nq_init(sdp->sd_freeze_gl, LM_ST_SHARED, GL_NOCACHE,
 856                                    &freeze_gh);
 857         if (error && !test_bit(SDF_WITHDRAWN, &sdp->sd_flags))
 858                 return error;
 859
 860         flush_workqueue(gfs2_delete_workqueue);
 861         if (sdp->sd_quotad_process)
 862                 kthread_stop(sdp->sd_quotad_process);
 863         sdp->sd_quotad_process = NULL;
 864         if (sdp->sd_logd_process)
 865                 kthread_stop(sdp->sd_logd_process);
 866         sdp->sd_logd_process = NULL;
 867
 868         gfs2_quota_sync(sdp->sd_vfs, 0);
 869         gfs2_statfs_sync(sdp->sd_vfs, 0);
 870
 871         gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_SHUTDOWN |
 872                        GFS2_LFC_MAKE_FS_RO);
 873         wait_event(sdp->sd_reserving_log_wait, atomic_read(&sdp->sd_reserving_log) == 0);
 874         gfs2_assert_warn(sdp, atomic_read(&sdp->sd_log_blks_free) == sdp->sd_jdesc->jd_blocks);
 875
 876         if (gfs2_holder_initialized(&freeze_gh))
 877                 gfs2_glock_dq_uninit(&freeze_gh);
 878
 879         gfs2_quota_cleanup(sdp);
 880
 881         return error;
 882 }
 883
 884 /**
 885  * gfs2_put_super - Unmount the filesystem
 886  * @sb: The VFS superblock
 887  *
 888  */
 889
 890 static void gfs2_put_super(struct super_block *sb)
 891 {
 892         struct gfs2_sbd *sdp = sb->s_fs_info;
 893         int error;
 894         struct gfs2_jdesc *jd;
 895
 896         /* No more recovery requests */
 897         set_bit(SDF_NORECOVERY, &sdp->sd_flags);
 898         smp_mb();
 899
 900         /* Wait on outstanding recovery */
 901 restart:
 902         spin_lock(&sdp->sd_jindex_spin);
 903         list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
 904                 if (!test_bit(JDF_RECOVERY, &jd->jd_flags))
 905                         continue;
 906                 spin_unlock(&sdp->sd_jindex_spin);
 907                 wait_on_bit(&jd->jd_flags, JDF_RECOVERY,
 908                             TASK_UNINTERRUPTIBLE);
 909                 goto restart;
 910         }
 911         spin_unlock(&sdp->sd_jindex_spin);
 912
 913         if (!sb_rdonly(sb)) {
 914                 error = gfs2_make_fs_ro(sdp);
 915                 if (error)
 916                         gfs2_io_error(sdp);
 917         }
 918         /*  At this point, we're through modifying the disk  */
 919
 920         /*  Release stuff  */
 921
 922         iput(sdp->sd_jindex);
 923         iput(sdp->sd_statfs_inode);
 924         iput(sdp->sd_rindex);
 925         iput(sdp->sd_quota_inode);
 926
 927         gfs2_glock_put(sdp->sd_rename_gl);
 928         gfs2_glock_put(sdp->sd_freeze_gl);
 929
 930         if (!sdp->sd_args.ar_spectator) {
 931                 gfs2_glock_dq_uninit(&sdp->sd_journal_gh);
 932                 gfs2_glock_dq_uninit(&sdp->sd_jinode_gh);
 933                 gfs2_glock_dq_uninit(&sdp->sd_sc_gh);
 934                 gfs2_glock_dq_uninit(&sdp->sd_qc_gh);
 935                 iput(sdp->sd_sc_inode);
 936                 iput(sdp->sd_qc_inode);
 937         }
 938
 939         gfs2_glock_dq_uninit(&sdp->sd_live_gh);
 940         gfs2_clear_rgrpd(sdp);
 941         gfs2_jindex_free(sdp);
 942         /*  Take apart glock structures and buffer lists  */
 943         gfs2_gl_hash_clear(sdp);
 944         gfs2_delete_debugfs_file(sdp);
 945         /*  Unmount the locking protocol  */
 946         gfs2_lm_unmount(sdp);
 947
 948         /*  At this point, we're through participating in the lockspace  */
 949         gfs2_sys_fs_del(sdp);
 950 }
 951
 952 /**
 953  * gfs2_sync_fs - sync the filesystem
 954  * @sb: the superblock
 955  *
 956  * Flushes the log to disk.
 957  */
 958
 959 static int gfs2_sync_fs(struct super_block *sb, int wait)
 960 {
 961         struct gfs2_sbd *sdp = sb->s_fs_info;
 962
 963         gfs2_quota_sync(sb, -1);
 964         if (wait)
 965                 gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_NORMAL |
 966                                GFS2_LFC_SYNC_FS);
 967         return sdp->sd_log_error;
 968 }
 969
 970 void gfs2_freeze_func(struct work_struct *work)
 971 {
 972         int error;
 973         struct gfs2_holder freeze_gh;
 974         struct gfs2_sbd *sdp = container_of(work, struct gfs2_sbd, sd_freeze_work);
 975         struct super_block *sb = sdp->sd_vfs;
 976
 977         atomic_inc(&sb->s_active);
 978         error = gfs2_glock_nq_init(sdp->sd_freeze_gl, LM_ST_SHARED, 0,
 979                                    &freeze_gh);
 980         if (error) {
 981                 printk(KERN_INFO "GFS2: couldn't get freeze lock : %d\n", error);
 982                 gfs2_assert_withdraw(sdp, 0);
 983         } else {
 984                 atomic_set(&sdp->sd_freeze_state, SFS_UNFROZEN);
 985                 error = thaw_super(sb);
 986                 if (error) {
 987                         printk(KERN_INFO "GFS2: couldn't thaw filesystem: %d\n",
 988                                error);
 989                         gfs2_assert_withdraw(sdp, 0);
 990                 }
 991                 if (!test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags))
 992                         freeze_gh.gh_flags |= GL_NOCACHE;
 993                 gfs2_glock_dq_uninit(&freeze_gh);
 994         }
 995         deactivate_super(sb);
 996         clear_bit_unlock(SDF_FS_FROZEN, &sdp->sd_flags);
 997         wake_up_bit(&sdp->sd_flags, SDF_FS_FROZEN);
 998         return;
 999 }
1000
1001 /**
1002  * gfs2_freeze - prevent further writes to the filesystem
1003  * @sb: the VFS structure for the filesystem
1004  *
1005  */
1006
1007 static int gfs2_freeze(struct super_block *sb)
1008 {
1009         struct gfs2_sbd *sdp = sb->s_fs_info;
1010         int error = 0;
1011
1012         mutex_lock(&sdp->sd_freeze_mutex);
1013         if (atomic_read(&sdp->sd_freeze_state) != SFS_UNFROZEN)
1014                 goto out;
1015
1016         if (test_bit(SDF_WITHDRAWN, &sdp->sd_flags)) {
1017                 error = -EINVAL;
1018                 goto out;
1019         }
1020
1021         for (;;) {
1022                 error = gfs2_lock_fs_check_clean(sdp, &sdp->sd_freeze_gh);
1023                 if (!error)
1024                         break;
1025
1026                 switch (error) {
1027                 case -EBUSY:
1028                         fs_err(sdp, "waiting for recovery before freeze\n");
1029                         break;
1030
1031                 default:
1032                         fs_err(sdp, "error freezing FS: %d\n", error);
1033                         break;
1034                 }
1035
1036                 fs_err(sdp, "retrying...\n");
1037                 msleep(1000);
1038         }
1039         error = 0;
1040         set_bit(SDF_FS_FROZEN, &sdp->sd_flags);
1041 out:
1042         mutex_unlock(&sdp->sd_freeze_mutex);
1043         return error;
1044 }
1045
1046 /**
1047  * gfs2_unfreeze - reallow writes to the filesystem
1048  * @sb: the VFS structure for the filesystem
1049  *
1050  */
1051
1052 static int gfs2_unfreeze(struct super_block *sb)
1053 {
1054         struct gfs2_sbd *sdp = sb->s_fs_info;
1055
1056         mutex_lock(&sdp->sd_freeze_mutex);
1057         if (atomic_read(&sdp->sd_freeze_state) != SFS_FROZEN ||
1058             !gfs2_holder_initialized(&sdp->sd_freeze_gh)) {
1059                 mutex_unlock(&sdp->sd_freeze_mutex);
1060                 return 0;
1061         }
1062
1063         gfs2_glock_dq_uninit(&sdp->sd_freeze_gh);
1064         mutex_unlock(&sdp->sd_freeze_mutex);
1065         return wait_on_bit(&sdp->sd_flags, SDF_FS_FROZEN, TASK_INTERRUPTIBLE);
1066 }
1067
1068 /**
1069  * statfs_fill - fill in the sg for a given RG
1070  * @rgd: the RG
1071  * @sc: the sc structure
1072  *
1073  * Returns: 0 on success, -ESTALE if the LVB is invalid
1074  */
1075
1076 static int statfs_slow_fill(struct gfs2_rgrpd *rgd,
1077                             struct gfs2_statfs_change_host *sc)
1078 {
1079         gfs2_rgrp_verify(rgd);
1080         sc->sc_total += rgd->rd_data;
1081         sc->sc_free += rgd->rd_free;
1082         sc->sc_dinodes += rgd->rd_dinodes;
1083         return 0;
1084 }
1085
1086 /**
1087  * gfs2_statfs_slow - Stat a filesystem using asynchronous locking
1088  * @sdp: the filesystem
1089  * @sc: the sc info that will be returned
1090  *
1091  * Any error (other than a signal) will cause this routine to fall back
1092  * to the synchronous version.
1093  *
1094  * FIXME: This really shouldn't busy wait like this.
1095  *
1096  * Returns: errno
1097  */
1098
1099 static int gfs2_statfs_slow(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *sc)
1100 {
1101         struct gfs2_rgrpd *rgd_next;
1102         struct gfs2_holder *gha, *gh;
1103         unsigned int slots = 64;
1104         unsigned int x;
1105         int done;
1106         int error = 0, err;
1107
1108         memset(sc, 0, sizeof(struct gfs2_statfs_change_host));
1109         gha = kmalloc_array(slots, sizeof(struct gfs2_holder), GFP_KERNEL);
1110         if (!gha)
1111                 return -ENOMEM;
1112         for (x = 0; x < slots; x++)
1113                 gfs2_holder_mark_uninitialized(gha + x);
1114
1115         rgd_next = gfs2_rgrpd_get_first(sdp);
1116
1117         for (;;) {
1118                 done = 1;
1119
1120                 for (x = 0; x < slots; x++) {
1121                         gh = gha + x;
1122
1123                         if (gfs2_holder_initialized(gh) && gfs2_glock_poll(gh)) {
1124                                 err = gfs2_glock_wait(gh);
1125                                 if (err) {
1126                                         gfs2_holder_uninit(gh);
1127                                         error = err;
1128                                 } else {
1129                                         if (!error) {
1130                                                 struct gfs2_rgrpd *rgd =
1131                                                         gfs2_glock2rgrp(gh->gh_gl);
1132
1133                                                 error = statfs_slow_fill(rgd, sc);
1134                                         }
1135                                         gfs2_glock_dq_uninit(gh);
1136                                 }
1137                         }
1138
1139                         if (gfs2_holder_initialized(gh))
1140                                 done = 0;
1141                         else if (rgd_next && !error) {
1142                                 error = gfs2_glock_nq_init(rgd_next->rd_gl,
1143                                                            LM_ST_SHARED,
1144                                                            GL_ASYNC,
1145                                                            gh);
1146                                 rgd_next = gfs2_rgrpd_get_next(rgd_next);
1147                                 done = 0;
1148                         }
1149
1150                         if (signal_pending(current))
1151                                 error = -ERESTARTSYS;
1152                 }
1153
1154                 if (done)
1155                         break;
1156
1157                 yield();
1158         }
1159
1160         kfree(gha);
1161         return error;
1162 }
1163
1164 /**
1165  * gfs2_statfs_i - Do a statfs
1166  * @sdp: the filesystem
1167  * @sg: the sg structure
1168  *
1169  * Returns: errno
1170  */
1171
1172 static int gfs2_statfs_i(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *sc)
1173 {
1174         struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
1175         struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
1176
1177         spin_lock(&sdp->sd_statfs_spin);
1178
1179         *sc = *m_sc;
1180         sc->sc_total += l_sc->sc_total;
1181         sc->sc_free += l_sc->sc_free;
1182         sc->sc_dinodes += l_sc->sc_dinodes;
1183
1184         spin_unlock(&sdp->sd_statfs_spin);
1185
1186         if (sc->sc_free < 0)
1187                 sc->sc_free = 0;
1188         if (sc->sc_free > sc->sc_total)
1189                 sc->sc_free = sc->sc_total;
1190         if (sc->sc_dinodes < 0)
1191                 sc->sc_dinodes = 0;
1192
1193         return 0;
1194 }
1195
1196 /**
1197  * gfs2_statfs - Gather and return stats about the filesystem
1198  * @sb: The superblock
1199  * @statfsbuf: The buffer
1200  *
1201  * Returns: 0 on success or error code
1202  */
1203
1204 static int gfs2_statfs(struct dentry *dentry, struct kstatfs *buf)
1205 {
1206         struct super_block *sb = dentry->d_sb;
1207         struct gfs2_sbd *sdp = sb->s_fs_info;
1208         struct gfs2_statfs_change_host sc;
1209         int error;
1210
1211         error = gfs2_rindex_update(sdp);
1212         if (error)
1213                 return error;
1214
1215         if (gfs2_tune_get(sdp, gt_statfs_slow))
1216                 error = gfs2_statfs_slow(sdp, &sc);
1217         else
1218                 error = gfs2_statfs_i(sdp, &sc);
1219
1220         if (error)
1221                 return error;
1222
1223         buf->f_type = GFS2_MAGIC;
1224         buf->f_bsize = sdp->sd_sb.sb_bsize;
1225         buf->f_blocks = sc.sc_total;
1226         buf->f_bfree = sc.sc_free;
1227         buf->f_bavail = sc.sc_free;
1228         buf->f_files = sc.sc_dinodes + sc.sc_free;
1229         buf->f_ffree = sc.sc_free;
1230         buf->f_namelen = GFS2_FNAMESIZE;
1231
1232         return 0;
1233 }
1234
1235 /**
1236  * gfs2_remount_fs - called when the FS is remounted
1237  * @sb:  the filesystem
1238  * @flags:  the remount flags
1239  * @data:  extra data passed in (not used right now)
1240  *
1241  * Returns: errno
1242  */
1243
1244 static int gfs2_remount_fs(struct super_block *sb, int *flags, char *data)
1245 {
1246         struct gfs2_sbd *sdp = sb->s_fs_info;
1247         struct gfs2_args args = sdp->sd_args; /* Default to current settings */
1248         struct gfs2_tune *gt = &sdp->sd_tune;
1249         int error;
1250
1251         sync_filesystem(sb);
1252
1253         spin_lock(&gt->gt_spin);
1254         args.ar_commit = gt->gt_logd_secs;
1255         args.ar_quota_quantum = gt->gt_quota_quantum;
1256         if (gt->gt_statfs_slow)
1257                 args.ar_statfs_quantum = 0;
1258         else
1259                 args.ar_statfs_quantum = gt->gt_statfs_quantum;
1260         spin_unlock(&gt->gt_spin);
1261         error = gfs2_mount_args(&args, data);
1262         if (error)
1263                 return error;
1264
1265         /* Not allowed to change locking details */
1266         if (strcmp(args.ar_lockproto, sdp->sd_args.ar_lockproto) ||
1267             strcmp(args.ar_locktable, sdp->sd_args.ar_locktable) ||
1268             strcmp(args.ar_hostdata, sdp->sd_args.ar_hostdata))
1269                 return -EINVAL;
1270
1271         /* Some flags must not be changed */
1272         if (args_neq(&args, &sdp->sd_args, spectator) ||
1273             args_neq(&args, &sdp->sd_args, localflocks) ||
1274             args_neq(&args, &sdp->sd_args, meta))
1275                 return -EINVAL;
1276
1277         if (sdp->sd_args.ar_spectator)
1278                 *flags |= SB_RDONLY;
1279
1280         if ((sb->s_flags ^ *flags) & SB_RDONLY) {
1281                 if (*flags & SB_RDONLY)
1282                         error = gfs2_make_fs_ro(sdp);
1283                 else
1284                         error = gfs2_make_fs_rw(sdp);
1285         }
1286
1287         sdp->sd_args = args;
1288         if (sdp->sd_args.ar_posix_acl)
1289                 sb->s_flags |= SB_POSIXACL;
1290         else
1291                 sb->s_flags &= ~SB_POSIXACL;
1292         if (sdp->sd_args.ar_nobarrier)
1293                 set_bit(SDF_NOBARRIERS, &sdp->sd_flags);
1294         else
1295                 clear_bit(SDF_NOBARRIERS, &sdp->sd_flags);
1296         spin_lock(&gt->gt_spin);
1297         gt->gt_logd_secs = args.ar_commit;
1298         gt->gt_quota_quantum = args.ar_quota_quantum;
1299         if (args.ar_statfs_quantum) {
1300                 gt->gt_statfs_slow = 0;
1301                 gt->gt_statfs_quantum = args.ar_statfs_quantum;
1302         }
1303         else {
1304                 gt->gt_statfs_slow = 1;
1305                 gt->gt_statfs_quantum = 30;
1306         }
1307         spin_unlock(&gt->gt_spin);
1308
1309         gfs2_online_uevent(sdp);
1310         return error;
1311 }
1312
1313 /**
1314  * gfs2_drop_inode - Drop an inode (test for remote unlink)
1315  * @inode: The inode to drop
1316  *
1317  * If we've received a callback on an iopen lock then it's because a
1318  * remote node tried to deallocate the inode but failed due to this node
1319  * still having the inode open. Here we mark the link count zero
1320  * since we know that it must have reached zero if the GLF_DEMOTE flag
1321  * is set on the iopen glock. If we didn't do a disk read since the
1322  * remote node removed the final link then we might otherwise miss
1323  * this event. This check ensures that this node will deallocate the
1324  * inode's blocks, or alternatively pass the baton on to another
1325  * node for later deallocation.
1326  */
1327
1328 static int gfs2_drop_inode(struct inode *inode)
1329 {
1330         struct gfs2_inode *ip = GFS2_I(inode);
1331
1332         if (!test_bit(GIF_FREE_VFS_INODE, &ip->i_flags) &&
1333             inode->i_nlink &&
1334             gfs2_holder_initialized(&ip->i_iopen_gh)) {
1335                 struct gfs2_glock *gl = ip->i_iopen_gh.gh_gl;
1336                 if (test_bit(GLF_DEMOTE, &gl->gl_flags))
1337                         clear_nlink(inode);
1338         }
1339
1340         /*
1341          * When under memory pressure when an inode's link count has dropped to
1342          * zero, defer deleting the inode to the delete workqueue.  This avoids
1343          * calling into DLM under memory pressure, which can deadlock.
1344          */
1345         if (!inode->i_nlink &&
1346             unlikely(current->flags & PF_MEMALLOC) &&
1347             gfs2_holder_initialized(&ip->i_iopen_gh)) {
1348                 struct gfs2_glock *gl = ip->i_iopen_gh.gh_gl;
1349
1350                 gfs2_glock_hold(gl);
1351                 if (queue_work(gfs2_delete_workqueue, &gl->gl_delete) == 0)
1352                         gfs2_glock_queue_put(gl);
1353                 return false;
1354         }
1355
1356         return generic_drop_inode(inode);
1357 }
1358
1359 static int is_ancestor(const struct dentry *d1, const struct dentry *d2)
1360 {
1361         do {
1362                 if (d1 == d2)
1363                         return 1;
1364                 d1 = d1->d_parent;
1365         } while (!IS_ROOT(d1));
1366         return 0;
1367 }
1368
1369 /**
1370  * gfs2_show_options - Show mount options for /proc/mounts
1371  * @s: seq_file structure
1372  * @root: root of this (sub)tree
1373  *
1374  * Returns: 0 on success or error code
1375  */
1376
1377 static int gfs2_show_options(struct seq_file *s, struct dentry *root)
1378 {
1379         struct gfs2_sbd *sdp = root->d_sb->s_fs_info;
1380         struct gfs2_args *args = &sdp->sd_args;
1381         int val;
1382
1383         if (is_ancestor(root, sdp->sd_master_dir))
1384                 seq_puts(s, ",meta");
1385         if (args->ar_lockproto[0])
1386                 seq_show_option(s, "lockproto", args->ar_lockproto);
1387         if (args->ar_locktable[0])
1388                 seq_show_option(s, "locktable", args->ar_locktable);
1389         if (args->ar_hostdata[0])
1390                 seq_show_option(s, "hostdata", args->ar_hostdata);
1391         if (args->ar_spectator)
1392                 seq_puts(s, ",spectator");
1393         if (args->ar_localflocks)
1394                 seq_puts(s, ",localflocks");
1395         if (args->ar_debug)
1396                 seq_puts(s, ",debug");
1397         if (args->ar_posix_acl)
1398                 seq_puts(s, ",acl");
1399         if (args->ar_quota != GFS2_QUOTA_DEFAULT) {
1400                 char *state;
1401                 switch (args->ar_quota) {
1402                 case GFS2_QUOTA_OFF:
1403                         state = "off";
1404                         break;
1405                 case GFS2_QUOTA_ACCOUNT:
1406                         state = "account";
1407                         break;
1408                 case GFS2_QUOTA_ON:
1409                         state = "on";
1410                         break;
1411                 default:
1412                         state = "unknown";
1413                         break;
1414                 }
1415                 seq_printf(s, ",quota=%s", state);
1416         }
1417         if (args->ar_suiddir)
1418                 seq_puts(s, ",suiddir");
1419         if (args->ar_data != GFS2_DATA_DEFAULT) {
1420                 char *state;
1421                 switch (args->ar_data) {
1422                 case GFS2_DATA_WRITEBACK:
1423                         state = "writeback";
1424                         break;
1425                 case GFS2_DATA_ORDERED:
1426                         state = "ordered";
1427                         break;
1428                 default:
1429                         state = "unknown";
1430                         break;
1431                 }
1432                 seq_printf(s, ",data=%s", state);
1433         }
1434         if (args->ar_discard)
1435                 seq_puts(s, ",discard");
1436         val = sdp->sd_tune.gt_logd_secs;
1437         if (val != 30)
1438                 seq_printf(s, ",commit=%d", val);
1439         val = sdp->sd_tune.gt_statfs_quantum;
1440         if (val != 30)
1441                 seq_printf(s, ",statfs_quantum=%d", val);
1442         else if (sdp->sd_tune.gt_statfs_slow)
1443                 seq_puts(s, ",statfs_quantum=0");
1444         val = sdp->sd_tune.gt_quota_quantum;
1445         if (val != 60)
1446                 seq_printf(s, ",quota_quantum=%d", val);
1447         if (args->ar_statfs_percent)
1448                 seq_printf(s, ",statfs_percent=%d", args->ar_statfs_percent);
1449         if (args->ar_errors != GFS2_ERRORS_DEFAULT) {
1450                 const char *state;
1451
1452                 switch (args->ar_errors) {
1453                 case GFS2_ERRORS_WITHDRAW:
1454                         state = "withdraw";
1455                         break;
1456                 case GFS2_ERRORS_PANIC:
1457                         state = "panic";
1458                         break;
1459                 default:
1460                         state = "unknown";
1461                         break;
1462                 }
1463                 seq_printf(s, ",errors=%s", state);
1464         }
1465         if (test_bit(SDF_NOBARRIERS, &sdp->sd_flags))
1466                 seq_puts(s, ",nobarrier");
1467         if (test_bit(SDF_DEMOTE, &sdp->sd_flags))
1468                 seq_puts(s, ",demote_interface_used");
1469         if (args->ar_rgrplvb)
1470                 seq_puts(s, ",rgrplvb");
1471         if (args->ar_loccookie)
1472                 seq_puts(s, ",loccookie");
1473         return 0;
1474 }
1475
1476 static void gfs2_final_release_pages(struct gfs2_inode *ip)
1477 {
1478         struct inode *inode = &ip->i_inode;
1479         struct gfs2_glock *gl = ip->i_gl;
1480
1481         truncate_inode_pages(gfs2_glock2aspace(ip->i_gl), 0);
1482         truncate_inode_pages(&inode->i_data, 0);
1483
1484         if (atomic_read(&gl->gl_revokes) == 0) {
1485                 clear_bit(GLF_LFLUSH, &gl->gl_flags);
1486                 clear_bit(GLF_DIRTY, &gl->gl_flags);
1487         }
1488 }
1489
1490 static int gfs2_dinode_dealloc(struct gfs2_inode *ip)
1491 {
1492         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1493         struct gfs2_rgrpd *rgd;
1494         struct gfs2_holder gh;
1495         int error;
1496
1497         if (gfs2_get_inode_blocks(&ip->i_inode) != 1) {
1498                 gfs2_consist_inode(ip);
1499                 return -EIO;
1500         }
1501
1502         error = gfs2_rindex_update(sdp);
1503         if (error)
1504                 return error;
1505
1506         error = gfs2_quota_hold(ip, NO_UID_QUOTA_CHANGE, NO_GID_QUOTA_CHANGE);
1507         if (error)
1508                 return error;
1509
1510         rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1);
1511         if (!rgd) {
1512                 gfs2_consist_inode(ip);
1513                 error = -EIO;
1514                 goto out_qs;
1515         }
1516
1517         error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &gh);
1518         if (error)
1519                 goto out_qs;
1520
1521         error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS + RES_QUOTA,
1522                                  sdp->sd_jdesc->jd_blocks);
1523         if (error)
1524                 goto out_rg_gunlock;
1525
1526         gfs2_free_di(rgd, ip);
1527
1528         gfs2_final_release_pages(ip);
1529
1530         gfs2_trans_end(sdp);
1531
1532 out_rg_gunlock:
1533         gfs2_glock_dq_uninit(&gh);
1534 out_qs:
1535         gfs2_quota_unhold(ip);
1536         return error;
1537 }
1538
1539 /**
1540  * gfs2_glock_put_eventually
1541  * @gl: The glock to put
1542  *
1543  * When under memory pressure, trigger a deferred glock put to make sure we
1544  * won't call into DLM and deadlock.  Otherwise, put the glock directly.
1545  */
1546
1547 static void gfs2_glock_put_eventually(struct gfs2_glock *gl)
1548 {
1549         if (current->flags & PF_MEMALLOC)
1550                 gfs2_glock_queue_put(gl);
1551         else
1552                 gfs2_glock_put(gl);
1553 }
1554
1555 /**
1556  * gfs2_evict_inode - Remove an inode from cache
1557  * @inode: The inode to evict
1558  *
1559  * There are three cases to consider:
1560  * 1. i_nlink == 0, we are final opener (and must deallocate)
1561  * 2. i_nlink == 0, we are not the final opener (and cannot deallocate)
1562  * 3. i_nlink > 0
1563  *
1564  * If the fs is read only, then we have to treat all cases as per #3
1565  * since we are unable to do any deallocation. The inode will be
1566  * deallocated by the next read/write node to attempt an allocation
1567  * in the same resource group
1568  *
1569  * We have to (at the moment) hold the inodes main lock to cover
1570  * the gap between unlocking the shared lock on the iopen lock and
1571  * taking the exclusive lock. I'd rather do a shared -> exclusive
1572  * conversion on the iopen lock, but we can change that later. This
1573  * is safe, just less efficient.
1574  */
1575
1576 static void gfs2_evict_inode(struct inode *inode)
1577 {
1578         struct super_block *sb = inode->i_sb;
1579         struct gfs2_sbd *sdp = sb->s_fs_info;
1580         struct gfs2_inode *ip = GFS2_I(inode);
1581         struct gfs2_holder gh;
1582         struct address_space *metamapping;
1583         int error;
1584
1585         if (test_bit(GIF_FREE_VFS_INODE, &ip->i_flags)) {
1586                 clear_inode(inode);
1587                 return;
1588         }
1589
1590         if (inode->i_nlink || sb_rdonly(sb))
1591                 goto out;
1592
1593         if (test_bit(GIF_ALLOC_FAILED, &ip->i_flags)) {
1594                 BUG_ON(!gfs2_glock_is_locked_by_me(ip->i_gl));
1595                 gfs2_holder_mark_uninitialized(&gh);
1596                 goto alloc_failed;
1597         }
1598
1599         /* Deletes should never happen under memory pressure anymore.  */
1600         if (WARN_ON_ONCE(current->flags & PF_MEMALLOC))
1601                 goto out;
1602
1603         /* Must not read inode block until block type has been verified */
1604         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, &gh);
1605         if (unlikely(error)) {
1606                 glock_clear_object(ip->i_iopen_gh.gh_gl, ip);
1607                 ip->i_iopen_gh.gh_flags |= GL_NOCACHE;
1608                 gfs2_glock_dq_uninit(&ip->i_iopen_gh);
1609                 goto out;
1610         }
1611
1612         error = gfs2_check_blk_type(sdp, ip->i_no_addr, GFS2_BLKST_UNLINKED);
1613         if (error)
1614                 goto out_truncate;
1615
1616         if (test_bit(GIF_INVALID, &ip->i_flags)) {
1617                 error = gfs2_inode_refresh(ip);
1618                 if (error)
1619                         goto out_truncate;
1620         }
1621
1622         /*
1623          * The inode may have been recreated in the meantime.
1624          */
1625         if (inode->i_nlink)
1626                 goto out_truncate;
1627
1628 alloc_failed:
1629         if (gfs2_holder_initialized(&ip->i_iopen_gh) &&
1630             test_bit(HIF_HOLDER, &ip->i_iopen_gh.gh_iflags)) {
1631                 ip->i_iopen_gh.gh_flags |= GL_NOCACHE;
1632                 gfs2_glock_dq_wait(&ip->i_iopen_gh);
1633                 gfs2_holder_reinit(LM_ST_EXCLUSIVE, LM_FLAG_TRY_1CB | GL_NOCACHE,
1634                                    &ip->i_iopen_gh);
1635                 error = gfs2_glock_nq(&ip->i_iopen_gh);
1636                 if (error)
1637                         goto out_truncate;
1638         }
1639
1640         if (S_ISDIR(inode->i_mode) &&
1641             (ip->i_diskflags & GFS2_DIF_EXHASH)) {
1642                 error = gfs2_dir_exhash_dealloc(ip);
1643                 if (error)
1644                         goto out_unlock;
1645         }
1646
1647         if (ip->i_eattr) {
1648                 error = gfs2_ea_dealloc(ip);
1649                 if (error)
1650                         goto out_unlock;
1651         }
1652
1653         if (!gfs2_is_stuffed(ip)) {
1654                 error = gfs2_file_dealloc(ip);
1655                 if (error)
1656                         goto out_unlock;
1657         }
1658
1659         /* We're about to clear the bitmap for the dinode, but as soon as we
1660            do, gfs2_create_inode can create another inode at the same block
1661            location and try to set gl_object again. We clear gl_object here so
1662            that subsequent inode creates don't see an old gl_object. */
1663         glock_clear_object(ip->i_gl, ip);
1664         error = gfs2_dinode_dealloc(ip);
1665         goto out_unlock;
1666
1667 out_truncate:
1668         gfs2_log_flush(sdp, ip->i_gl, GFS2_LOG_HEAD_FLUSH_NORMAL |
1669                        GFS2_LFC_EVICT_INODE);
1670         metamapping = gfs2_glock2aspace(ip->i_gl);
1671         if (test_bit(GLF_DIRTY, &ip->i_gl->gl_flags)) {
1672                 filemap_fdatawrite(metamapping);
1673                 filemap_fdatawait(metamapping);
1674         }
1675         write_inode_now(inode, 1);
1676         gfs2_ail_flush(ip->i_gl, 0);
1677
1678         error = gfs2_trans_begin(sdp, 0, sdp->sd_jdesc->jd_blocks);
1679         if (error)
1680                 goto out_unlock;
1681         /* Needs to be done before glock release & also in a transaction */
1682         truncate_inode_pages(&inode->i_data, 0);
1683         truncate_inode_pages(metamapping, 0);
1684         gfs2_trans_end(sdp);
1685
1686 out_unlock:
1687         if (gfs2_rs_active(&ip->i_res))
1688                 gfs2_rs_deltree(&ip->i_res);
1689
1690         if (gfs2_holder_initialized(&ip->i_iopen_gh)) {
1691                 glock_clear_object(ip->i_iopen_gh.gh_gl, ip);
1692                 if (test_bit(HIF_HOLDER, &ip->i_iopen_gh.gh_iflags)) {
1693                         ip->i_iopen_gh.gh_flags |= GL_NOCACHE;
1694                         gfs2_glock_dq(&ip->i_iopen_gh);
1695                 }
1696                 gfs2_holder_uninit(&ip->i_iopen_gh);
1697         }
1698         if (gfs2_holder_initialized(&gh)) {
1699                 glock_clear_object(ip->i_gl, ip);
1700                 gfs2_glock_dq_uninit(&gh);
1701         }
1702         if (error && error != GLR_TRYFAILED && error != -EROFS)
1703                 fs_warn(sdp, "gfs2_evict_inode: %d\n", error);
1704 out:
1705         truncate_inode_pages_final(&inode->i_data);
1706         gfs2_rsqa_delete(ip, NULL);
1707         gfs2_ordered_del_inode(ip);
1708         clear_inode(inode);
1709         gfs2_dir_hash_inval(ip);
1710         glock_clear_object(ip->i_gl, ip);
1711         wait_on_bit_io(&ip->i_flags, GIF_GLOP_PENDING, TASK_UNINTERRUPTIBLE);
1712         gfs2_glock_add_to_lru(ip->i_gl);
1713         gfs2_glock_put_eventually(ip->i_gl);
1714         ip->i_gl = NULL;
1715         if (gfs2_holder_initialized(&ip->i_iopen_gh)) {
1716                 struct gfs2_glock *gl = ip->i_iopen_gh.gh_gl;
1717
1718                 glock_clear_object(gl, ip);
1719                 ip->i_iopen_gh.gh_flags |= GL_NOCACHE;
1720                 gfs2_glock_hold(gl);
1721                 gfs2_glock_dq_uninit(&ip->i_iopen_gh);
1722                 gfs2_glock_put_eventually(gl);
1723         }
1724 }
1725
1726 static struct inode *gfs2_alloc_inode(struct super_block *sb)
1727 {
1728         struct gfs2_inode *ip;
1729
1730         ip = kmem_cache_alloc(gfs2_inode_cachep, GFP_KERNEL);
1731         if (ip) {
1732                 ip->i_flags = 0;
1733                 ip->i_gl = NULL;
1734                 memset(&ip->i_res, 0, sizeof(ip->i_res));
1735                 RB_CLEAR_NODE(&ip->i_res.rs_node);
1736                 ip->i_rahead = 0;
1737         }
1738         return &ip->i_inode;
1739 }
1740
1741 static void gfs2_free_inode(struct inode *inode)
1742 {
1743         kmem_cache_free(gfs2_inode_cachep, GFS2_I(inode));
1744 }
1745
1746 const struct super_operations gfs2_super_ops = {
1747         .alloc_inode            = gfs2_alloc_inode,
1748         .free_inode             = gfs2_free_inode,
1749         .write_inode            = gfs2_write_inode,
1750         .dirty_inode            = gfs2_dirty_inode,
1751         .evict_inode            = gfs2_evict_inode,
1752         .put_super              = gfs2_put_super,
1753         .sync_fs                = gfs2_sync_fs,
1754         .freeze_super           = gfs2_freeze,
1755         .thaw_super             = gfs2_unfreeze,
1756         .statfs                 = gfs2_statfs,
1757         .remount_fs             = gfs2_remount_fs,
1758         .drop_inode             = gfs2_drop_inode,
1759         .show_options           = gfs2_show_options,
1760 };
1761