linux/fs/gfs2/super.c
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   1/*
   2 * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
   3 * Copyright (C) 2004-2007 Red Hat, Inc.  All rights reserved.
   4 *
   5 * This copyrighted material is made available to anyone wishing to use,
   6 * modify, copy, or redistribute it subject to the terms and conditions
   7 * of the GNU General Public License version 2.
   8 */
   9
  10#include <linux/bio.h>
  11#include <linux/sched.h>
  12#include <linux/slab.h>
  13#include <linux/spinlock.h>
  14#include <linux/completion.h>
  15#include <linux/buffer_head.h>
  16#include <linux/statfs.h>
  17#include <linux/seq_file.h>
  18#include <linux/mount.h>
  19#include <linux/kthread.h>
  20#include <linux/delay.h>
  21#include <linux/gfs2_ondisk.h>
  22#include <linux/crc32.h>
  23#include <linux/time.h>
  24#include <linux/wait.h>
  25#include <linux/writeback.h>
  26#include <linux/backing-dev.h>
  27
  28#include "gfs2.h"
  29#include "incore.h"
  30#include "bmap.h"
  31#include "dir.h"
  32#include "glock.h"
  33#include "glops.h"
  34#include "inode.h"
  35#include "log.h"
  36#include "meta_io.h"
  37#include "quota.h"
  38#include "recovery.h"
  39#include "rgrp.h"
  40#include "super.h"
  41#include "trans.h"
  42#include "util.h"
  43#include "sys.h"
  44#include "xattr.h"
  45
  46#define args_neq(a1, a2, x) ((a1)->ar_##x != (a2)->ar_##x)
  47
  48enum {
  49        Opt_lockproto,
  50        Opt_locktable,
  51        Opt_hostdata,
  52        Opt_spectator,
  53        Opt_ignore_local_fs,
  54        Opt_localflocks,
  55        Opt_localcaching,
  56        Opt_debug,
  57        Opt_nodebug,
  58        Opt_upgrade,
  59        Opt_acl,
  60        Opt_noacl,
  61        Opt_quota_off,
  62        Opt_quota_account,
  63        Opt_quota_on,
  64        Opt_quota,
  65        Opt_noquota,
  66        Opt_suiddir,
  67        Opt_nosuiddir,
  68        Opt_data_writeback,
  69        Opt_data_ordered,
  70        Opt_meta,
  71        Opt_discard,
  72        Opt_nodiscard,
  73        Opt_commit,
  74        Opt_err_withdraw,
  75        Opt_err_panic,
  76        Opt_statfs_quantum,
  77        Opt_statfs_percent,
  78        Opt_quota_quantum,
  79        Opt_barrier,
  80        Opt_nobarrier,
  81        Opt_rgrplvb,
  82        Opt_norgrplvb,
  83        Opt_error,
  84};
  85
  86static const match_table_t tokens = {
  87        {Opt_lockproto, "lockproto=%s"},
  88        {Opt_locktable, "locktable=%s"},
  89        {Opt_hostdata, "hostdata=%s"},
  90        {Opt_spectator, "spectator"},
  91        {Opt_spectator, "norecovery"},
  92        {Opt_ignore_local_fs, "ignore_local_fs"},
  93        {Opt_localflocks, "localflocks"},
  94        {Opt_localcaching, "localcaching"},
  95        {Opt_debug, "debug"},
  96        {Opt_nodebug, "nodebug"},
  97        {Opt_upgrade, "upgrade"},
  98        {Opt_acl, "acl"},
  99        {Opt_noacl, "noacl"},
 100        {Opt_quota_off, "quota=off"},
 101        {Opt_quota_account, "quota=account"},
 102        {Opt_quota_on, "quota=on"},
 103        {Opt_quota, "quota"},
 104        {Opt_noquota, "noquota"},
 105        {Opt_suiddir, "suiddir"},
 106        {Opt_nosuiddir, "nosuiddir"},
 107        {Opt_data_writeback, "data=writeback"},
 108        {Opt_data_ordered, "data=ordered"},
 109        {Opt_meta, "meta"},
 110        {Opt_discard, "discard"},
 111        {Opt_nodiscard, "nodiscard"},
 112        {Opt_commit, "commit=%d"},
 113        {Opt_err_withdraw, "errors=withdraw"},
 114        {Opt_err_panic, "errors=panic"},
 115        {Opt_statfs_quantum, "statfs_quantum=%d"},
 116        {Opt_statfs_percent, "statfs_percent=%d"},
 117        {Opt_quota_quantum, "quota_quantum=%d"},
 118        {Opt_barrier, "barrier"},
 119        {Opt_nobarrier, "nobarrier"},
 120        {Opt_rgrplvb, "rgrplvb"},
 121        {Opt_norgrplvb, "norgrplvb"},
 122        {Opt_error, NULL}
 123};
 124
 125/**
 126 * gfs2_mount_args - Parse mount options
 127 * @args: The structure into which the parsed options will be written
 128 * @options: The options to parse
 129 *
 130 * Return: errno
 131 */
 132
 133int gfs2_mount_args(struct gfs2_args *args, char *options)
 134{
 135        char *o;
 136        int token;
 137        substring_t tmp[MAX_OPT_ARGS];
 138        int rv;
 139
 140        /* Split the options into tokens with the "," character and
 141           process them */
 142
 143        while (1) {
 144                o = strsep(&options, ",");
 145                if (o == NULL)
 146                        break;
 147                if (*o == '\0')
 148                        continue;
 149
 150                token = match_token(o, tokens, tmp);
 151                switch (token) {
 152                case Opt_lockproto:
 153                        match_strlcpy(args->ar_lockproto, &tmp[0],
 154                                      GFS2_LOCKNAME_LEN);
 155                        break;
 156                case Opt_locktable:
 157                        match_strlcpy(args->ar_locktable, &tmp[0],
 158                                      GFS2_LOCKNAME_LEN);
 159                        break;
 160                case Opt_hostdata:
 161                        match_strlcpy(args->ar_hostdata, &tmp[0],
 162                                      GFS2_LOCKNAME_LEN);
 163                        break;
 164                case Opt_spectator:
 165                        args->ar_spectator = 1;
 166                        break;
 167                case Opt_ignore_local_fs:
 168                        /* Retained for backwards compat only */
 169                        break;
 170                case Opt_localflocks:
 171                        args->ar_localflocks = 1;
 172                        break;
 173                case Opt_localcaching:
 174                        /* Retained for backwards compat only */
 175                        break;
 176                case Opt_debug:
 177                        if (args->ar_errors == GFS2_ERRORS_PANIC) {
 178                                printk(KERN_WARNING "GFS2: -o debug and -o errors=panic "
 179                                       "are mutually exclusive.\n");
 180                                return -EINVAL;
 181                        }
 182                        args->ar_debug = 1;
 183                        break;
 184                case Opt_nodebug:
 185                        args->ar_debug = 0;
 186                        break;
 187                case Opt_upgrade:
 188                        /* Retained for backwards compat only */
 189                        break;
 190                case Opt_acl:
 191                        args->ar_posix_acl = 1;
 192                        break;
 193                case Opt_noacl:
 194                        args->ar_posix_acl = 0;
 195                        break;
 196                case Opt_quota_off:
 197                case Opt_noquota:
 198                        args->ar_quota = GFS2_QUOTA_OFF;
 199                        break;
 200                case Opt_quota_account:
 201                        args->ar_quota = GFS2_QUOTA_ACCOUNT;
 202                        break;
 203                case Opt_quota_on:
 204                case Opt_quota:
 205                        args->ar_quota = GFS2_QUOTA_ON;
 206                        break;
 207                case Opt_suiddir:
 208                        args->ar_suiddir = 1;
 209                        break;
 210                case Opt_nosuiddir:
 211                        args->ar_suiddir = 0;
 212                        break;
 213                case Opt_data_writeback:
 214                        args->ar_data = GFS2_DATA_WRITEBACK;
 215                        break;
 216                case Opt_data_ordered:
 217                        args->ar_data = GFS2_DATA_ORDERED;
 218                        break;
 219                case Opt_meta:
 220                        args->ar_meta = 1;
 221                        break;
 222                case Opt_discard:
 223                        args->ar_discard = 1;
 224                        break;
 225                case Opt_nodiscard:
 226                        args->ar_discard = 0;
 227                        break;
 228                case Opt_commit:
 229                        rv = match_int(&tmp[0], &args->ar_commit);
 230                        if (rv || args->ar_commit <= 0) {
 231                                printk(KERN_WARNING "GFS2: commit mount option requires a positive numeric argument\n");
 232                                return rv ? rv : -EINVAL;
 233                        }
 234                        break;
 235                case Opt_statfs_quantum:
 236                        rv = match_int(&tmp[0], &args->ar_statfs_quantum);
 237                        if (rv || args->ar_statfs_quantum < 0) {
 238                                printk(KERN_WARNING "GFS2: statfs_quantum mount option requires a non-negative numeric argument\n");
 239                                return rv ? rv : -EINVAL;
 240                        }
 241                        break;
 242                case Opt_quota_quantum:
 243                        rv = match_int(&tmp[0], &args->ar_quota_quantum);
 244                        if (rv || args->ar_quota_quantum <= 0) {
 245                                printk(KERN_WARNING "GFS2: quota_quantum mount option requires a positive numeric argument\n");
 246                                return rv ? rv : -EINVAL;
 247                        }
 248                        break;
 249                case Opt_statfs_percent:
 250                        rv = match_int(&tmp[0], &args->ar_statfs_percent);
 251                        if (rv || args->ar_statfs_percent < 0 ||
 252                            args->ar_statfs_percent > 100) {
 253                                printk(KERN_WARNING "statfs_percent mount option requires a numeric argument between 0 and 100\n");
 254                                return rv ? rv : -EINVAL;
 255                        }
 256                        break;
 257                case Opt_err_withdraw:
 258                        args->ar_errors = GFS2_ERRORS_WITHDRAW;
 259                        break;
 260                case Opt_err_panic:
 261                        if (args->ar_debug) {
 262                                printk(KERN_WARNING "GFS2: -o debug and -o errors=panic "
 263                                        "are mutually exclusive.\n");
 264                                return -EINVAL;
 265                        }
 266                        args->ar_errors = GFS2_ERRORS_PANIC;
 267                        break;
 268                case Opt_barrier:
 269                        args->ar_nobarrier = 0;
 270                        break;
 271                case Opt_nobarrier:
 272                        args->ar_nobarrier = 1;
 273                        break;
 274                case Opt_rgrplvb:
 275                        args->ar_rgrplvb = 1;
 276                        break;
 277                case Opt_norgrplvb:
 278                        args->ar_rgrplvb = 0;
 279                        break;
 280                case Opt_error:
 281                default:
 282                        printk(KERN_WARNING "GFS2: invalid mount option: %s\n", o);
 283                        return -EINVAL;
 284                }
 285        }
 286
 287        return 0;
 288}
 289
 290/**
 291 * gfs2_jindex_free - Clear all the journal index information
 292 * @sdp: The GFS2 superblock
 293 *
 294 */
 295
 296void gfs2_jindex_free(struct gfs2_sbd *sdp)
 297{
 298        struct list_head list, *head;
 299        struct gfs2_jdesc *jd;
 300        struct gfs2_journal_extent *jext;
 301
 302        spin_lock(&sdp->sd_jindex_spin);
 303        list_add(&list, &sdp->sd_jindex_list);
 304        list_del_init(&sdp->sd_jindex_list);
 305        sdp->sd_journals = 0;
 306        spin_unlock(&sdp->sd_jindex_spin);
 307
 308        while (!list_empty(&list)) {
 309                jd = list_entry(list.next, struct gfs2_jdesc, jd_list);
 310                head = &jd->extent_list;
 311                while (!list_empty(head)) {
 312                        jext = list_entry(head->next,
 313                                          struct gfs2_journal_extent,
 314                                          extent_list);
 315                        list_del(&jext->extent_list);
 316                        kfree(jext);
 317                }
 318                list_del(&jd->jd_list);
 319                iput(jd->jd_inode);
 320                kfree(jd);
 321        }
 322}
 323
 324static struct gfs2_jdesc *jdesc_find_i(struct list_head *head, unsigned int jid)
 325{
 326        struct gfs2_jdesc *jd;
 327        int found = 0;
 328
 329        list_for_each_entry(jd, head, jd_list) {
 330                if (jd->jd_jid == jid) {
 331                        found = 1;
 332                        break;
 333                }
 334        }
 335
 336        if (!found)
 337                jd = NULL;
 338
 339        return jd;
 340}
 341
 342struct gfs2_jdesc *gfs2_jdesc_find(struct gfs2_sbd *sdp, unsigned int jid)
 343{
 344        struct gfs2_jdesc *jd;
 345
 346        spin_lock(&sdp->sd_jindex_spin);
 347        jd = jdesc_find_i(&sdp->sd_jindex_list, jid);
 348        spin_unlock(&sdp->sd_jindex_spin);
 349
 350        return jd;
 351}
 352
 353int gfs2_jdesc_check(struct gfs2_jdesc *jd)
 354{
 355        struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
 356        struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
 357        u64 size = i_size_read(jd->jd_inode);
 358
 359        if (gfs2_check_internal_file_size(jd->jd_inode, 8 << 20, 1 << 30))
 360                return -EIO;
 361
 362        jd->jd_blocks = size >> sdp->sd_sb.sb_bsize_shift;
 363
 364        if (gfs2_write_alloc_required(ip, 0, size)) {
 365                gfs2_consist_inode(ip);
 366                return -EIO;
 367        }
 368
 369        return 0;
 370}
 371
 372/**
 373 * gfs2_make_fs_rw - Turn a Read-Only FS into a Read-Write one
 374 * @sdp: the filesystem
 375 *
 376 * Returns: errno
 377 */
 378
 379int gfs2_make_fs_rw(struct gfs2_sbd *sdp)
 380{
 381        struct gfs2_inode *ip = GFS2_I(sdp->sd_jdesc->jd_inode);
 382        struct gfs2_glock *j_gl = ip->i_gl;
 383        struct gfs2_holder t_gh;
 384        struct gfs2_log_header_host head;
 385        int error;
 386
 387        error = gfs2_glock_nq_init(sdp->sd_trans_gl, LM_ST_SHARED, 0, &t_gh);
 388        if (error)
 389                return error;
 390
 391        j_gl->gl_ops->go_inval(j_gl, DIO_METADATA);
 392
 393        error = gfs2_find_jhead(sdp->sd_jdesc, &head);
 394        if (error)
 395                goto fail;
 396
 397        if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) {
 398                gfs2_consist(sdp);
 399                error = -EIO;
 400                goto fail;
 401        }
 402
 403        /*  Initialize some head of the log stuff  */
 404        sdp->sd_log_sequence = head.lh_sequence + 1;
 405        gfs2_log_pointers_init(sdp, head.lh_blkno);
 406
 407        error = gfs2_quota_init(sdp);
 408        if (error)
 409                goto fail;
 410
 411        set_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags);
 412
 413        gfs2_glock_dq_uninit(&t_gh);
 414
 415        return 0;
 416
 417fail:
 418        t_gh.gh_flags |= GL_NOCACHE;
 419        gfs2_glock_dq_uninit(&t_gh);
 420
 421        return error;
 422}
 423
 424void gfs2_statfs_change_in(struct gfs2_statfs_change_host *sc, const void *buf)
 425{
 426        const struct gfs2_statfs_change *str = buf;
 427
 428        sc->sc_total = be64_to_cpu(str->sc_total);
 429        sc->sc_free = be64_to_cpu(str->sc_free);
 430        sc->sc_dinodes = be64_to_cpu(str->sc_dinodes);
 431}
 432
 433static void gfs2_statfs_change_out(const struct gfs2_statfs_change_host *sc, void *buf)
 434{
 435        struct gfs2_statfs_change *str = buf;
 436
 437        str->sc_total = cpu_to_be64(sc->sc_total);
 438        str->sc_free = cpu_to_be64(sc->sc_free);
 439        str->sc_dinodes = cpu_to_be64(sc->sc_dinodes);
 440}
 441
 442int gfs2_statfs_init(struct gfs2_sbd *sdp)
 443{
 444        struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
 445        struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
 446        struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
 447        struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
 448        struct buffer_head *m_bh, *l_bh;
 449        struct gfs2_holder gh;
 450        int error;
 451
 452        error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE,
 453                                   &gh);
 454        if (error)
 455                return error;
 456
 457        error = gfs2_meta_inode_buffer(m_ip, &m_bh);
 458        if (error)
 459                goto out;
 460
 461        if (sdp->sd_args.ar_spectator) {
 462                spin_lock(&sdp->sd_statfs_spin);
 463                gfs2_statfs_change_in(m_sc, m_bh->b_data +
 464                                      sizeof(struct gfs2_dinode));
 465                spin_unlock(&sdp->sd_statfs_spin);
 466        } else {
 467                error = gfs2_meta_inode_buffer(l_ip, &l_bh);
 468                if (error)
 469                        goto out_m_bh;
 470
 471                spin_lock(&sdp->sd_statfs_spin);
 472                gfs2_statfs_change_in(m_sc, m_bh->b_data +
 473                                      sizeof(struct gfs2_dinode));
 474                gfs2_statfs_change_in(l_sc, l_bh->b_data +
 475                                      sizeof(struct gfs2_dinode));
 476                spin_unlock(&sdp->sd_statfs_spin);
 477
 478                brelse(l_bh);
 479        }
 480
 481out_m_bh:
 482        brelse(m_bh);
 483out:
 484        gfs2_glock_dq_uninit(&gh);
 485        return 0;
 486}
 487
 488void gfs2_statfs_change(struct gfs2_sbd *sdp, s64 total, s64 free,
 489                        s64 dinodes)
 490{
 491        struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
 492        struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
 493        struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
 494        struct buffer_head *l_bh;
 495        s64 x, y;
 496        int need_sync = 0;
 497        int error;
 498
 499        error = gfs2_meta_inode_buffer(l_ip, &l_bh);
 500        if (error)
 501                return;
 502
 503        gfs2_trans_add_bh(l_ip->i_gl, l_bh, 1);
 504
 505        spin_lock(&sdp->sd_statfs_spin);
 506        l_sc->sc_total += total;
 507        l_sc->sc_free += free;
 508        l_sc->sc_dinodes += dinodes;
 509        gfs2_statfs_change_out(l_sc, l_bh->b_data + sizeof(struct gfs2_dinode));
 510        if (sdp->sd_args.ar_statfs_percent) {
 511                x = 100 * l_sc->sc_free;
 512                y = m_sc->sc_free * sdp->sd_args.ar_statfs_percent;
 513                if (x >= y || x <= -y)
 514                        need_sync = 1;
 515        }
 516        spin_unlock(&sdp->sd_statfs_spin);
 517
 518        brelse(l_bh);
 519        if (need_sync)
 520                gfs2_wake_up_statfs(sdp);
 521}
 522
 523void update_statfs(struct gfs2_sbd *sdp, struct buffer_head *m_bh,
 524                   struct buffer_head *l_bh)
 525{
 526        struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
 527        struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
 528        struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
 529        struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
 530
 531        gfs2_trans_add_bh(l_ip->i_gl, l_bh, 1);
 532
 533        spin_lock(&sdp->sd_statfs_spin);
 534        m_sc->sc_total += l_sc->sc_total;
 535        m_sc->sc_free += l_sc->sc_free;
 536        m_sc->sc_dinodes += l_sc->sc_dinodes;
 537        memset(l_sc, 0, sizeof(struct gfs2_statfs_change));
 538        memset(l_bh->b_data + sizeof(struct gfs2_dinode),
 539               0, sizeof(struct gfs2_statfs_change));
 540        spin_unlock(&sdp->sd_statfs_spin);
 541
 542        gfs2_trans_add_bh(m_ip->i_gl, m_bh, 1);
 543        gfs2_statfs_change_out(m_sc, m_bh->b_data + sizeof(struct gfs2_dinode));
 544}
 545
 546int gfs2_statfs_sync(struct super_block *sb, int type)
 547{
 548        struct gfs2_sbd *sdp = sb->s_fs_info;
 549        struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
 550        struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
 551        struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
 552        struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
 553        struct gfs2_holder gh;
 554        struct buffer_head *m_bh, *l_bh;
 555        int error;
 556
 557        error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE,
 558                                   &gh);
 559        if (error)
 560                return error;
 561
 562        error = gfs2_meta_inode_buffer(m_ip, &m_bh);
 563        if (error)
 564                goto out;
 565
 566        spin_lock(&sdp->sd_statfs_spin);
 567        gfs2_statfs_change_in(m_sc, m_bh->b_data +
 568                              sizeof(struct gfs2_dinode));
 569        if (!l_sc->sc_total && !l_sc->sc_free && !l_sc->sc_dinodes) {
 570                spin_unlock(&sdp->sd_statfs_spin);
 571                goto out_bh;
 572        }
 573        spin_unlock(&sdp->sd_statfs_spin);
 574
 575        error = gfs2_meta_inode_buffer(l_ip, &l_bh);
 576        if (error)
 577                goto out_bh;
 578
 579        error = gfs2_trans_begin(sdp, 2 * RES_DINODE, 0);
 580        if (error)
 581                goto out_bh2;
 582
 583        update_statfs(sdp, m_bh, l_bh);
 584        sdp->sd_statfs_force_sync = 0;
 585
 586        gfs2_trans_end(sdp);
 587
 588out_bh2:
 589        brelse(l_bh);
 590out_bh:
 591        brelse(m_bh);
 592out:
 593        gfs2_glock_dq_uninit(&gh);
 594        return error;
 595}
 596
 597struct lfcc {
 598        struct list_head list;
 599        struct gfs2_holder gh;
 600};
 601
 602/**
 603 * gfs2_lock_fs_check_clean - Stop all writes to the FS and check that all
 604 *                            journals are clean
 605 * @sdp: the file system
 606 * @state: the state to put the transaction lock into
 607 * @t_gh: the hold on the transaction lock
 608 *
 609 * Returns: errno
 610 */
 611
 612static int gfs2_lock_fs_check_clean(struct gfs2_sbd *sdp,
 613                                    struct gfs2_holder *t_gh)
 614{
 615        struct gfs2_inode *ip;
 616        struct gfs2_jdesc *jd;
 617        struct lfcc *lfcc;
 618        LIST_HEAD(list);
 619        struct gfs2_log_header_host lh;
 620        int error;
 621
 622        list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
 623                lfcc = kmalloc(sizeof(struct lfcc), GFP_KERNEL);
 624                if (!lfcc) {
 625                        error = -ENOMEM;
 626                        goto out;
 627                }
 628                ip = GFS2_I(jd->jd_inode);
 629                error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &lfcc->gh);
 630                if (error) {
 631                        kfree(lfcc);
 632                        goto out;
 633                }
 634                list_add(&lfcc->list, &list);
 635        }
 636
 637        error = gfs2_glock_nq_init(sdp->sd_trans_gl, LM_ST_DEFERRED,
 638                                   GL_NOCACHE, t_gh);
 639
 640        list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
 641                error = gfs2_jdesc_check(jd);
 642                if (error)
 643                        break;
 644                error = gfs2_find_jhead(jd, &lh);
 645                if (error)
 646                        break;
 647                if (!(lh.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) {
 648                        error = -EBUSY;
 649                        break;
 650                }
 651        }
 652
 653        if (error)
 654                gfs2_glock_dq_uninit(t_gh);
 655
 656out:
 657        while (!list_empty(&list)) {
 658                lfcc = list_entry(list.next, struct lfcc, list);
 659                list_del(&lfcc->list);
 660                gfs2_glock_dq_uninit(&lfcc->gh);
 661                kfree(lfcc);
 662        }
 663        return error;
 664}
 665
 666/**
 667 * gfs2_freeze_fs - freezes the file system
 668 * @sdp: the file system
 669 *
 670 * This function flushes data and meta data for all machines by
 671 * acquiring the transaction log exclusively.  All journals are
 672 * ensured to be in a clean state as well.
 673 *
 674 * Returns: errno
 675 */
 676
 677int gfs2_freeze_fs(struct gfs2_sbd *sdp)
 678{
 679        int error = 0;
 680
 681        mutex_lock(&sdp->sd_freeze_lock);
 682
 683        if (!sdp->sd_freeze_count++) {
 684                error = gfs2_lock_fs_check_clean(sdp, &sdp->sd_freeze_gh);
 685                if (error)
 686                        sdp->sd_freeze_count--;
 687        }
 688
 689        mutex_unlock(&sdp->sd_freeze_lock);
 690
 691        return error;
 692}
 693
 694/**
 695 * gfs2_unfreeze_fs - unfreezes the file system
 696 * @sdp: the file system
 697 *
 698 * This function allows the file system to proceed by unlocking
 699 * the exclusively held transaction lock.  Other GFS2 nodes are
 700 * now free to acquire the lock shared and go on with their lives.
 701 *
 702 */
 703
 704void gfs2_unfreeze_fs(struct gfs2_sbd *sdp)
 705{
 706        mutex_lock(&sdp->sd_freeze_lock);
 707
 708        if (sdp->sd_freeze_count && !--sdp->sd_freeze_count)
 709                gfs2_glock_dq_uninit(&sdp->sd_freeze_gh);
 710
 711        mutex_unlock(&sdp->sd_freeze_lock);
 712}
 713
 714void gfs2_dinode_out(const struct gfs2_inode *ip, void *buf)
 715{
 716        struct gfs2_dinode *str = buf;
 717
 718        str->di_header.mh_magic = cpu_to_be32(GFS2_MAGIC);
 719        str->di_header.mh_type = cpu_to_be32(GFS2_METATYPE_DI);
 720        str->di_header.mh_format = cpu_to_be32(GFS2_FORMAT_DI);
 721        str->di_num.no_addr = cpu_to_be64(ip->i_no_addr);
 722        str->di_num.no_formal_ino = cpu_to_be64(ip->i_no_formal_ino);
 723        str->di_mode = cpu_to_be32(ip->i_inode.i_mode);
 724        str->di_uid = cpu_to_be32(ip->i_inode.i_uid);
 725        str->di_gid = cpu_to_be32(ip->i_inode.i_gid);
 726        str->di_nlink = cpu_to_be32(ip->i_inode.i_nlink);
 727        str->di_size = cpu_to_be64(i_size_read(&ip->i_inode));
 728        str->di_blocks = cpu_to_be64(gfs2_get_inode_blocks(&ip->i_inode));
 729        str->di_atime = cpu_to_be64(ip->i_inode.i_atime.tv_sec);
 730        str->di_mtime = cpu_to_be64(ip->i_inode.i_mtime.tv_sec);
 731        str->di_ctime = cpu_to_be64(ip->i_inode.i_ctime.tv_sec);
 732
 733        str->di_goal_meta = cpu_to_be64(ip->i_goal);
 734        str->di_goal_data = cpu_to_be64(ip->i_goal);
 735        str->di_generation = cpu_to_be64(ip->i_generation);
 736
 737        str->di_flags = cpu_to_be32(ip->i_diskflags);
 738        str->di_height = cpu_to_be16(ip->i_height);
 739        str->di_payload_format = cpu_to_be32(S_ISDIR(ip->i_inode.i_mode) &&
 740                                             !(ip->i_diskflags & GFS2_DIF_EXHASH) ?
 741                                             GFS2_FORMAT_DE : 0);
 742        str->di_depth = cpu_to_be16(ip->i_depth);
 743        str->di_entries = cpu_to_be32(ip->i_entries);
 744
 745        str->di_eattr = cpu_to_be64(ip->i_eattr);
 746        str->di_atime_nsec = cpu_to_be32(ip->i_inode.i_atime.tv_nsec);
 747        str->di_mtime_nsec = cpu_to_be32(ip->i_inode.i_mtime.tv_nsec);
 748        str->di_ctime_nsec = cpu_to_be32(ip->i_inode.i_ctime.tv_nsec);
 749}
 750
 751/**
 752 * gfs2_write_inode - Make sure the inode is stable on the disk
 753 * @inode: The inode
 754 * @wbc: The writeback control structure
 755 *
 756 * Returns: errno
 757 */
 758
 759static int gfs2_write_inode(struct inode *inode, struct writeback_control *wbc)
 760{
 761        struct gfs2_inode *ip = GFS2_I(inode);
 762        struct gfs2_sbd *sdp = GFS2_SB(inode);
 763        struct address_space *metamapping = gfs2_glock2aspace(ip->i_gl);
 764        struct backing_dev_info *bdi = metamapping->backing_dev_info;
 765        int ret = 0;
 766
 767        if (wbc->sync_mode == WB_SYNC_ALL)
 768                gfs2_log_flush(GFS2_SB(inode), ip->i_gl);
 769        if (bdi->dirty_exceeded)
 770                gfs2_ail1_flush(sdp, wbc);
 771        else
 772                filemap_fdatawrite(metamapping);
 773        if (wbc->sync_mode == WB_SYNC_ALL)
 774                ret = filemap_fdatawait(metamapping);
 775        if (ret)
 776                mark_inode_dirty_sync(inode);
 777        return ret;
 778}
 779
 780/**
 781 * gfs2_dirty_inode - check for atime updates
 782 * @inode: The inode in question
 783 * @flags: The type of dirty
 784 *
 785 * Unfortunately it can be called under any combination of inode
 786 * glock and transaction lock, so we have to check carefully.
 787 *
 788 * At the moment this deals only with atime - it should be possible
 789 * to expand that role in future, once a review of the locking has
 790 * been carried out.
 791 */
 792
 793static void gfs2_dirty_inode(struct inode *inode, int flags)
 794{
 795        struct gfs2_inode *ip = GFS2_I(inode);
 796        struct gfs2_sbd *sdp = GFS2_SB(inode);
 797        struct buffer_head *bh;
 798        struct gfs2_holder gh;
 799        int need_unlock = 0;
 800        int need_endtrans = 0;
 801        int ret;
 802
 803        if (!(flags & (I_DIRTY_DATASYNC|I_DIRTY_SYNC)))
 804                return;
 805
 806        if (!gfs2_glock_is_locked_by_me(ip->i_gl)) {
 807                ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
 808                if (ret) {
 809                        fs_err(sdp, "dirty_inode: glock %d\n", ret);
 810                        return;
 811                }
 812                need_unlock = 1;
 813        } else if (WARN_ON_ONCE(ip->i_gl->gl_state != LM_ST_EXCLUSIVE))
 814                return;
 815
 816        if (current->journal_info == NULL) {
 817                ret = gfs2_trans_begin(sdp, RES_DINODE, 0);
 818                if (ret) {
 819                        fs_err(sdp, "dirty_inode: gfs2_trans_begin %d\n", ret);
 820                        goto out;
 821                }
 822                need_endtrans = 1;
 823        }
 824
 825        ret = gfs2_meta_inode_buffer(ip, &bh);
 826        if (ret == 0) {
 827                gfs2_trans_add_bh(ip->i_gl, bh, 1);
 828                gfs2_dinode_out(ip, bh->b_data);
 829                brelse(bh);
 830        }
 831
 832        if (need_endtrans)
 833                gfs2_trans_end(sdp);
 834out:
 835        if (need_unlock)
 836                gfs2_glock_dq_uninit(&gh);
 837}
 838
 839/**
 840 * gfs2_make_fs_ro - Turn a Read-Write FS into a Read-Only one
 841 * @sdp: the filesystem
 842 *
 843 * Returns: errno
 844 */
 845
 846static int gfs2_make_fs_ro(struct gfs2_sbd *sdp)
 847{
 848        struct gfs2_holder t_gh;
 849        int error;
 850
 851        flush_workqueue(gfs2_delete_workqueue);
 852        gfs2_quota_sync(sdp->sd_vfs, 0);
 853        gfs2_statfs_sync(sdp->sd_vfs, 0);
 854
 855        error = gfs2_glock_nq_init(sdp->sd_trans_gl, LM_ST_SHARED, GL_NOCACHE,
 856                                   &t_gh);
 857        if (error && !test_bit(SDF_SHUTDOWN, &sdp->sd_flags))
 858                return error;
 859
 860        gfs2_meta_syncfs(sdp);
 861        gfs2_log_shutdown(sdp);
 862
 863        clear_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags);
 864
 865        if (t_gh.gh_gl)
 866                gfs2_glock_dq_uninit(&t_gh);
 867
 868        gfs2_quota_cleanup(sdp);
 869
 870        return error;
 871}
 872
 873static int gfs2_umount_recovery_wait(void *word)
 874{
 875        schedule();
 876        return 0;
 877}
 878
 879/**
 880 * gfs2_put_super - Unmount the filesystem
 881 * @sb: The VFS superblock
 882 *
 883 */
 884
 885static void gfs2_put_super(struct super_block *sb)
 886{
 887        struct gfs2_sbd *sdp = sb->s_fs_info;
 888        int error;
 889        struct gfs2_jdesc *jd;
 890
 891        /*  Unfreeze the filesystem, if we need to  */
 892
 893        mutex_lock(&sdp->sd_freeze_lock);
 894        if (sdp->sd_freeze_count)
 895                gfs2_glock_dq_uninit(&sdp->sd_freeze_gh);
 896        mutex_unlock(&sdp->sd_freeze_lock);
 897
 898        /* No more recovery requests */
 899        set_bit(SDF_NORECOVERY, &sdp->sd_flags);
 900        smp_mb();
 901
 902        /* Wait on outstanding recovery */
 903restart:
 904        spin_lock(&sdp->sd_jindex_spin);
 905        list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
 906                if (!test_bit(JDF_RECOVERY, &jd->jd_flags))
 907                        continue;
 908                spin_unlock(&sdp->sd_jindex_spin);
 909                wait_on_bit(&jd->jd_flags, JDF_RECOVERY,
 910                            gfs2_umount_recovery_wait, TASK_UNINTERRUPTIBLE);
 911                goto restart;
 912        }
 913        spin_unlock(&sdp->sd_jindex_spin);
 914
 915        kthread_stop(sdp->sd_quotad_process);
 916        kthread_stop(sdp->sd_logd_process);
 917
 918        if (!(sb->s_flags & MS_RDONLY)) {
 919                error = gfs2_make_fs_ro(sdp);
 920                if (error)
 921                        gfs2_io_error(sdp);
 922        }
 923        /*  At this point, we're through modifying the disk  */
 924
 925        /*  Release stuff  */
 926
 927        iput(sdp->sd_jindex);
 928        iput(sdp->sd_statfs_inode);
 929        iput(sdp->sd_rindex);
 930        iput(sdp->sd_quota_inode);
 931
 932        gfs2_glock_put(sdp->sd_rename_gl);
 933        gfs2_glock_put(sdp->sd_trans_gl);
 934
 935        if (!sdp->sd_args.ar_spectator) {
 936                gfs2_glock_dq_uninit(&sdp->sd_journal_gh);
 937                gfs2_glock_dq_uninit(&sdp->sd_jinode_gh);
 938                gfs2_glock_dq_uninit(&sdp->sd_sc_gh);
 939                gfs2_glock_dq_uninit(&sdp->sd_qc_gh);
 940                iput(sdp->sd_sc_inode);
 941                iput(sdp->sd_qc_inode);
 942        }
 943
 944        gfs2_glock_dq_uninit(&sdp->sd_live_gh);
 945        gfs2_clear_rgrpd(sdp);
 946        gfs2_jindex_free(sdp);
 947        /*  Take apart glock structures and buffer lists  */
 948        gfs2_gl_hash_clear(sdp);
 949        /*  Unmount the locking protocol  */
 950        gfs2_lm_unmount(sdp);
 951
 952        /*  At this point, we're through participating in the lockspace  */
 953        gfs2_sys_fs_del(sdp);
 954}
 955
 956/**
 957 * gfs2_sync_fs - sync the filesystem
 958 * @sb: the superblock
 959 *
 960 * Flushes the log to disk.
 961 */
 962
 963static int gfs2_sync_fs(struct super_block *sb, int wait)
 964{
 965        struct gfs2_sbd *sdp = sb->s_fs_info;
 966
 967        gfs2_quota_sync(sb, -1);
 968        if (wait && sdp)
 969                gfs2_log_flush(sdp, NULL);
 970        return 0;
 971}
 972
 973/**
 974 * gfs2_freeze - prevent further writes to the filesystem
 975 * @sb: the VFS structure for the filesystem
 976 *
 977 */
 978
 979static int gfs2_freeze(struct super_block *sb)
 980{
 981        struct gfs2_sbd *sdp = sb->s_fs_info;
 982        int error;
 983
 984        if (test_bit(SDF_SHUTDOWN, &sdp->sd_flags))
 985                return -EINVAL;
 986
 987        for (;;) {
 988                error = gfs2_freeze_fs(sdp);
 989                if (!error)
 990                        break;
 991
 992                switch (error) {
 993                case -EBUSY:
 994                        fs_err(sdp, "waiting for recovery before freeze\n");
 995                        break;
 996
 997                default:
 998                        fs_err(sdp, "error freezing FS: %d\n", error);
 999                        break;
1000                }
1001
1002                fs_err(sdp, "retrying...\n");
1003                msleep(1000);
1004        }
1005        return 0;
1006}
1007
1008/**
1009 * gfs2_unfreeze - reallow writes to the filesystem
1010 * @sb: the VFS structure for the filesystem
1011 *
1012 */
1013
1014static int gfs2_unfreeze(struct super_block *sb)
1015{
1016        gfs2_unfreeze_fs(sb->s_fs_info);
1017        return 0;
1018}
1019
1020/**
1021 * statfs_fill - fill in the sg for a given RG
1022 * @rgd: the RG
1023 * @sc: the sc structure
1024 *
1025 * Returns: 0 on success, -ESTALE if the LVB is invalid
1026 */
1027
1028static int statfs_slow_fill(struct gfs2_rgrpd *rgd,
1029                            struct gfs2_statfs_change_host *sc)
1030{
1031        gfs2_rgrp_verify(rgd);
1032        sc->sc_total += rgd->rd_data;
1033        sc->sc_free += rgd->rd_free;
1034        sc->sc_dinodes += rgd->rd_dinodes;
1035        return 0;
1036}
1037
1038/**
1039 * gfs2_statfs_slow - Stat a filesystem using asynchronous locking
1040 * @sdp: the filesystem
1041 * @sc: the sc info that will be returned
1042 *
1043 * Any error (other than a signal) will cause this routine to fall back
1044 * to the synchronous version.
1045 *
1046 * FIXME: This really shouldn't busy wait like this.
1047 *
1048 * Returns: errno
1049 */
1050
1051static int gfs2_statfs_slow(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *sc)
1052{
1053        struct gfs2_rgrpd *rgd_next;
1054        struct gfs2_holder *gha, *gh;
1055        unsigned int slots = 64;
1056        unsigned int x;
1057        int done;
1058        int error = 0, err;
1059
1060        memset(sc, 0, sizeof(struct gfs2_statfs_change_host));
1061        gha = kcalloc(slots, sizeof(struct gfs2_holder), GFP_KERNEL);
1062        if (!gha)
1063                return -ENOMEM;
1064
1065        rgd_next = gfs2_rgrpd_get_first(sdp);
1066
1067        for (;;) {
1068                done = 1;
1069
1070                for (x = 0; x < slots; x++) {
1071                        gh = gha + x;
1072
1073                        if (gh->gh_gl && gfs2_glock_poll(gh)) {
1074                                err = gfs2_glock_wait(gh);
1075                                if (err) {
1076                                        gfs2_holder_uninit(gh);
1077                                        error = err;
1078                                } else {
1079                                        if (!error)
1080                                                error = statfs_slow_fill(
1081                                                        gh->gh_gl->gl_object, sc);
1082                                        gfs2_glock_dq_uninit(gh);
1083                                }
1084                        }
1085
1086                        if (gh->gh_gl)
1087                                done = 0;
1088                        else if (rgd_next && !error) {
1089                                error = gfs2_glock_nq_init(rgd_next->rd_gl,
1090                                                           LM_ST_SHARED,
1091                                                           GL_ASYNC,
1092                                                           gh);
1093                                rgd_next = gfs2_rgrpd_get_next(rgd_next);
1094                                done = 0;
1095                        }
1096
1097                        if (signal_pending(current))
1098                                error = -ERESTARTSYS;
1099                }
1100
1101                if (done)
1102                        break;
1103
1104                yield();
1105        }
1106
1107        kfree(gha);
1108        return error;
1109}
1110
1111/**
1112 * gfs2_statfs_i - Do a statfs
1113 * @sdp: the filesystem
1114 * @sg: the sg structure
1115 *
1116 * Returns: errno
1117 */
1118
1119static int gfs2_statfs_i(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *sc)
1120{
1121        struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
1122        struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
1123
1124        spin_lock(&sdp->sd_statfs_spin);
1125
1126        *sc = *m_sc;
1127        sc->sc_total += l_sc->sc_total;
1128        sc->sc_free += l_sc->sc_free;
1129        sc->sc_dinodes += l_sc->sc_dinodes;
1130
1131        spin_unlock(&sdp->sd_statfs_spin);
1132
1133        if (sc->sc_free < 0)
1134                sc->sc_free = 0;
1135        if (sc->sc_free > sc->sc_total)
1136                sc->sc_free = sc->sc_total;
1137        if (sc->sc_dinodes < 0)
1138                sc->sc_dinodes = 0;
1139
1140        return 0;
1141}
1142
1143/**
1144 * gfs2_statfs - Gather and return stats about the filesystem
1145 * @sb: The superblock
1146 * @statfsbuf: The buffer
1147 *
1148 * Returns: 0 on success or error code
1149 */
1150
1151static int gfs2_statfs(struct dentry *dentry, struct kstatfs *buf)
1152{
1153        struct super_block *sb = dentry->d_inode->i_sb;
1154        struct gfs2_sbd *sdp = sb->s_fs_info;
1155        struct gfs2_statfs_change_host sc;
1156        int error;
1157
1158        error = gfs2_rindex_update(sdp);
1159        if (error)
1160                return error;
1161
1162        if (gfs2_tune_get(sdp, gt_statfs_slow))
1163                error = gfs2_statfs_slow(sdp, &sc);
1164        else
1165                error = gfs2_statfs_i(sdp, &sc);
1166
1167        if (error)
1168                return error;
1169
1170        buf->f_type = GFS2_MAGIC;
1171        buf->f_bsize = sdp->sd_sb.sb_bsize;
1172        buf->f_blocks = sc.sc_total;
1173        buf->f_bfree = sc.sc_free;
1174        buf->f_bavail = sc.sc_free;
1175        buf->f_files = sc.sc_dinodes + sc.sc_free;
1176        buf->f_ffree = sc.sc_free;
1177        buf->f_namelen = GFS2_FNAMESIZE;
1178
1179        return 0;
1180}
1181
1182/**
1183 * gfs2_remount_fs - called when the FS is remounted
1184 * @sb:  the filesystem
1185 * @flags:  the remount flags
1186 * @data:  extra data passed in (not used right now)
1187 *
1188 * Returns: errno
1189 */
1190
1191static int gfs2_remount_fs(struct super_block *sb, int *flags, char *data)
1192{
1193        struct gfs2_sbd *sdp = sb->s_fs_info;
1194        struct gfs2_args args = sdp->sd_args; /* Default to current settings */
1195        struct gfs2_tune *gt = &sdp->sd_tune;
1196        int error;
1197
1198        spin_lock(&gt->gt_spin);
1199        args.ar_commit = gt->gt_logd_secs;
1200        args.ar_quota_quantum = gt->gt_quota_quantum;
1201        if (gt->gt_statfs_slow)
1202                args.ar_statfs_quantum = 0;
1203        else
1204                args.ar_statfs_quantum = gt->gt_statfs_quantum;
1205        spin_unlock(&gt->gt_spin);
1206        error = gfs2_mount_args(&args, data);
1207        if (error)
1208                return error;
1209
1210        /* Not allowed to change locking details */
1211        if (strcmp(args.ar_lockproto, sdp->sd_args.ar_lockproto) ||
1212            strcmp(args.ar_locktable, sdp->sd_args.ar_locktable) ||
1213            strcmp(args.ar_hostdata, sdp->sd_args.ar_hostdata))
1214                return -EINVAL;
1215
1216        /* Some flags must not be changed */
1217        if (args_neq(&args, &sdp->sd_args, spectator) ||
1218            args_neq(&args, &sdp->sd_args, localflocks) ||
1219            args_neq(&args, &sdp->sd_args, meta))
1220                return -EINVAL;
1221
1222        if (sdp->sd_args.ar_spectator)
1223                *flags |= MS_RDONLY;
1224
1225        if ((sb->s_flags ^ *flags) & MS_RDONLY) {
1226                if (*flags & MS_RDONLY)
1227                        error = gfs2_make_fs_ro(sdp);
1228                else
1229                        error = gfs2_make_fs_rw(sdp);
1230                if (error)
1231                        return error;
1232        }
1233
1234        sdp->sd_args = args;
1235        if (sdp->sd_args.ar_posix_acl)
1236                sb->s_flags |= MS_POSIXACL;
1237        else
1238                sb->s_flags &= ~MS_POSIXACL;
1239        if (sdp->sd_args.ar_nobarrier)
1240                set_bit(SDF_NOBARRIERS, &sdp->sd_flags);
1241        else
1242                clear_bit(SDF_NOBARRIERS, &sdp->sd_flags);
1243        spin_lock(&gt->gt_spin);
1244        gt->gt_logd_secs = args.ar_commit;
1245        gt->gt_quota_quantum = args.ar_quota_quantum;
1246        if (args.ar_statfs_quantum) {
1247                gt->gt_statfs_slow = 0;
1248                gt->gt_statfs_quantum = args.ar_statfs_quantum;
1249        }
1250        else {
1251                gt->gt_statfs_slow = 1;
1252                gt->gt_statfs_quantum = 30;
1253        }
1254        spin_unlock(&gt->gt_spin);
1255
1256        gfs2_online_uevent(sdp);
1257        return 0;
1258}
1259
1260/**
1261 * gfs2_drop_inode - Drop an inode (test for remote unlink)
1262 * @inode: The inode to drop
1263 *
1264 * If we've received a callback on an iopen lock then its because a
1265 * remote node tried to deallocate the inode but failed due to this node
1266 * still having the inode open. Here we mark the link count zero
1267 * since we know that it must have reached zero if the GLF_DEMOTE flag
1268 * is set on the iopen glock. If we didn't do a disk read since the
1269 * remote node removed the final link then we might otherwise miss
1270 * this event. This check ensures that this node will deallocate the
1271 * inode's blocks, or alternatively pass the baton on to another
1272 * node for later deallocation.
1273 */
1274
1275static int gfs2_drop_inode(struct inode *inode)
1276{
1277        struct gfs2_inode *ip = GFS2_I(inode);
1278
1279        if (inode->i_nlink) {
1280                struct gfs2_glock *gl = ip->i_iopen_gh.gh_gl;
1281                if (gl && test_bit(GLF_DEMOTE, &gl->gl_flags))
1282                        clear_nlink(inode);
1283        }
1284        return generic_drop_inode(inode);
1285}
1286
1287static int is_ancestor(const struct dentry *d1, const struct dentry *d2)
1288{
1289        do {
1290                if (d1 == d2)
1291                        return 1;
1292                d1 = d1->d_parent;
1293        } while (!IS_ROOT(d1));
1294        return 0;
1295}
1296
1297/**
1298 * gfs2_show_options - Show mount options for /proc/mounts
1299 * @s: seq_file structure
1300 * @root: root of this (sub)tree
1301 *
1302 * Returns: 0 on success or error code
1303 */
1304
1305static int gfs2_show_options(struct seq_file *s, struct dentry *root)
1306{
1307        struct gfs2_sbd *sdp = root->d_sb->s_fs_info;
1308        struct gfs2_args *args = &sdp->sd_args;
1309        int val;
1310
1311        if (is_ancestor(root, sdp->sd_master_dir))
1312                seq_printf(s, ",meta");
1313        if (args->ar_lockproto[0])
1314                seq_printf(s, ",lockproto=%s", args->ar_lockproto);
1315        if (args->ar_locktable[0])
1316                seq_printf(s, ",locktable=%s", args->ar_locktable);
1317        if (args->ar_hostdata[0])
1318                seq_printf(s, ",hostdata=%s", args->ar_hostdata);
1319        if (args->ar_spectator)
1320                seq_printf(s, ",spectator");
1321        if (args->ar_localflocks)
1322                seq_printf(s, ",localflocks");
1323        if (args->ar_debug)
1324                seq_printf(s, ",debug");
1325        if (args->ar_posix_acl)
1326                seq_printf(s, ",acl");
1327        if (args->ar_quota != GFS2_QUOTA_DEFAULT) {
1328                char *state;
1329                switch (args->ar_quota) {
1330                case GFS2_QUOTA_OFF:
1331                        state = "off";
1332                        break;
1333                case GFS2_QUOTA_ACCOUNT:
1334                        state = "account";
1335                        break;
1336                case GFS2_QUOTA_ON:
1337                        state = "on";
1338                        break;
1339                default:
1340                        state = "unknown";
1341                        break;
1342                }
1343                seq_printf(s, ",quota=%s", state);
1344        }
1345        if (args->ar_suiddir)
1346                seq_printf(s, ",suiddir");
1347        if (args->ar_data != GFS2_DATA_DEFAULT) {
1348                char *state;
1349                switch (args->ar_data) {
1350                case GFS2_DATA_WRITEBACK:
1351                        state = "writeback";
1352                        break;
1353                case GFS2_DATA_ORDERED:
1354                        state = "ordered";
1355                        break;
1356                default:
1357                        state = "unknown";
1358                        break;
1359                }
1360                seq_printf(s, ",data=%s", state);
1361        }
1362        if (args->ar_discard)
1363                seq_printf(s, ",discard");
1364        val = sdp->sd_tune.gt_logd_secs;
1365        if (val != 30)
1366                seq_printf(s, ",commit=%d", val);
1367        val = sdp->sd_tune.gt_statfs_quantum;
1368        if (val != 30)
1369                seq_printf(s, ",statfs_quantum=%d", val);
1370        else if (sdp->sd_tune.gt_statfs_slow)
1371                seq_puts(s, ",statfs_quantum=0");
1372        val = sdp->sd_tune.gt_quota_quantum;
1373        if (val != 60)
1374                seq_printf(s, ",quota_quantum=%d", val);
1375        if (args->ar_statfs_percent)
1376                seq_printf(s, ",statfs_percent=%d", args->ar_statfs_percent);
1377        if (args->ar_errors != GFS2_ERRORS_DEFAULT) {
1378                const char *state;
1379
1380                switch (args->ar_errors) {
1381                case GFS2_ERRORS_WITHDRAW:
1382                        state = "withdraw";
1383                        break;
1384                case GFS2_ERRORS_PANIC:
1385                        state = "panic";
1386                        break;
1387                default:
1388                        state = "unknown";
1389                        break;
1390                }
1391                seq_printf(s, ",errors=%s", state);
1392        }
1393        if (test_bit(SDF_NOBARRIERS, &sdp->sd_flags))
1394                seq_printf(s, ",nobarrier");
1395        if (test_bit(SDF_DEMOTE, &sdp->sd_flags))
1396                seq_printf(s, ",demote_interface_used");
1397        if (args->ar_rgrplvb)
1398                seq_printf(s, ",rgrplvb");
1399        return 0;
1400}
1401
1402static void gfs2_final_release_pages(struct gfs2_inode *ip)
1403{
1404        struct inode *inode = &ip->i_inode;
1405        struct gfs2_glock *gl = ip->i_gl;
1406
1407        truncate_inode_pages(gfs2_glock2aspace(ip->i_gl), 0);
1408        truncate_inode_pages(&inode->i_data, 0);
1409
1410        if (atomic_read(&gl->gl_revokes) == 0) {
1411                clear_bit(GLF_LFLUSH, &gl->gl_flags);
1412                clear_bit(GLF_DIRTY, &gl->gl_flags);
1413        }
1414}
1415
1416static int gfs2_dinode_dealloc(struct gfs2_inode *ip)
1417{
1418        struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1419        struct gfs2_rgrpd *rgd;
1420        struct gfs2_holder gh;
1421        int error;
1422
1423        if (gfs2_get_inode_blocks(&ip->i_inode) != 1) {
1424                gfs2_consist_inode(ip);
1425                return -EIO;
1426        }
1427
1428        error = gfs2_rindex_update(sdp);
1429        if (error)
1430                return error;
1431
1432        error = gfs2_quota_hold(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
1433        if (error)
1434                return error;
1435
1436        rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1);
1437        if (!rgd) {
1438                gfs2_consist_inode(ip);
1439                error = -EIO;
1440                goto out_qs;
1441        }
1442
1443        error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &gh);
1444        if (error)
1445                goto out_qs;
1446
1447        error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS + RES_QUOTA,
1448                                 sdp->sd_jdesc->jd_blocks);
1449        if (error)
1450                goto out_rg_gunlock;
1451
1452        gfs2_free_di(rgd, ip);
1453
1454        gfs2_final_release_pages(ip);
1455
1456        gfs2_trans_end(sdp);
1457
1458out_rg_gunlock:
1459        gfs2_glock_dq_uninit(&gh);
1460out_qs:
1461        gfs2_quota_unhold(ip);
1462        return error;
1463}
1464
1465/**
1466 * gfs2_evict_inode - Remove an inode from cache
1467 * @inode: The inode to evict
1468 *
1469 * There are three cases to consider:
1470 * 1. i_nlink == 0, we are final opener (and must deallocate)
1471 * 2. i_nlink == 0, we are not the final opener (and cannot deallocate)
1472 * 3. i_nlink > 0
1473 *
1474 * If the fs is read only, then we have to treat all cases as per #3
1475 * since we are unable to do any deallocation. The inode will be
1476 * deallocated by the next read/write node to attempt an allocation
1477 * in the same resource group
1478 *
1479 * We have to (at the moment) hold the inodes main lock to cover
1480 * the gap between unlocking the shared lock on the iopen lock and
1481 * taking the exclusive lock. I'd rather do a shared -> exclusive
1482 * conversion on the iopen lock, but we can change that later. This
1483 * is safe, just less efficient.
1484 */
1485
1486static void gfs2_evict_inode(struct inode *inode)
1487{
1488        struct super_block *sb = inode->i_sb;
1489        struct gfs2_sbd *sdp = sb->s_fs_info;
1490        struct gfs2_inode *ip = GFS2_I(inode);
1491        struct gfs2_holder gh;
1492        int error;
1493
1494        if (inode->i_nlink || (sb->s_flags & MS_RDONLY))
1495                goto out;
1496
1497        /* Must not read inode block until block type has been verified */
1498        error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, &gh);
1499        if (unlikely(error)) {
1500                gfs2_glock_dq_uninit(&ip->i_iopen_gh);
1501                goto out;
1502        }
1503
1504        if (!test_bit(GIF_ALLOC_FAILED, &ip->i_flags)) {
1505                error = gfs2_check_blk_type(sdp, ip->i_no_addr, GFS2_BLKST_UNLINKED);
1506                if (error)
1507                        goto out_truncate;
1508        }
1509
1510        if (test_bit(GIF_INVALID, &ip->i_flags)) {
1511                error = gfs2_inode_refresh(ip);
1512                if (error)
1513                        goto out_truncate;
1514        }
1515
1516        ip->i_iopen_gh.gh_flags |= GL_NOCACHE;
1517        gfs2_glock_dq_wait(&ip->i_iopen_gh);
1518        gfs2_holder_reinit(LM_ST_EXCLUSIVE, LM_FLAG_TRY_1CB | GL_NOCACHE, &ip->i_iopen_gh);
1519        error = gfs2_glock_nq(&ip->i_iopen_gh);
1520        if (error)
1521                goto out_truncate;
1522
1523        /* Case 1 starts here */
1524
1525        if (S_ISDIR(inode->i_mode) &&
1526            (ip->i_diskflags & GFS2_DIF_EXHASH)) {
1527                error = gfs2_dir_exhash_dealloc(ip);
1528                if (error)
1529                        goto out_unlock;
1530        }
1531
1532        if (ip->i_eattr) {
1533                error = gfs2_ea_dealloc(ip);
1534                if (error)
1535                        goto out_unlock;
1536        }
1537
1538        if (!gfs2_is_stuffed(ip)) {
1539                error = gfs2_file_dealloc(ip);
1540                if (error)
1541                        goto out_unlock;
1542        }
1543
1544        error = gfs2_dinode_dealloc(ip);
1545        goto out_unlock;
1546
1547out_truncate:
1548        gfs2_log_flush(sdp, ip->i_gl);
1549        if (test_bit(GLF_DIRTY, &ip->i_gl->gl_flags)) {
1550                struct address_space *metamapping = gfs2_glock2aspace(ip->i_gl);
1551                filemap_fdatawrite(metamapping);
1552                filemap_fdatawait(metamapping);
1553        }
1554        write_inode_now(inode, 1);
1555        gfs2_ail_flush(ip->i_gl, 0);
1556
1557        /* Case 2 starts here */
1558        error = gfs2_trans_begin(sdp, 0, sdp->sd_jdesc->jd_blocks);
1559        if (error)
1560                goto out_unlock;
1561        /* Needs to be done before glock release & also in a transaction */
1562        truncate_inode_pages(&inode->i_data, 0);
1563        gfs2_trans_end(sdp);
1564
1565out_unlock:
1566        /* Error path for case 1 */
1567        if (gfs2_rs_active(ip->i_res))
1568                gfs2_rs_deltree(ip, ip->i_res);
1569
1570        if (test_bit(HIF_HOLDER, &ip->i_iopen_gh.gh_iflags))
1571                gfs2_glock_dq(&ip->i_iopen_gh);
1572        gfs2_holder_uninit(&ip->i_iopen_gh);
1573        gfs2_glock_dq_uninit(&gh);
1574        if (error && error != GLR_TRYFAILED && error != -EROFS)
1575                fs_warn(sdp, "gfs2_evict_inode: %d\n", error);
1576out:
1577        /* Case 3 starts here */
1578        truncate_inode_pages(&inode->i_data, 0);
1579        gfs2_rs_delete(ip);
1580        clear_inode(inode);
1581        gfs2_dir_hash_inval(ip);
1582        ip->i_gl->gl_object = NULL;
1583        flush_delayed_work(&ip->i_gl->gl_work);
1584        gfs2_glock_add_to_lru(ip->i_gl);
1585        gfs2_glock_put(ip->i_gl);
1586        ip->i_gl = NULL;
1587        if (ip->i_iopen_gh.gh_gl) {
1588                ip->i_iopen_gh.gh_gl->gl_object = NULL;
1589                gfs2_glock_dq_uninit(&ip->i_iopen_gh);
1590        }
1591}
1592
1593static struct inode *gfs2_alloc_inode(struct super_block *sb)
1594{
1595        struct gfs2_inode *ip;
1596
1597        ip = kmem_cache_alloc(gfs2_inode_cachep, GFP_KERNEL);
1598        if (ip) {
1599                ip->i_flags = 0;
1600                ip->i_gl = NULL;
1601                ip->i_rgd = NULL;
1602                ip->i_res = NULL;
1603        }
1604        return &ip->i_inode;
1605}
1606
1607static void gfs2_i_callback(struct rcu_head *head)
1608{
1609        struct inode *inode = container_of(head, struct inode, i_rcu);
1610        kmem_cache_free(gfs2_inode_cachep, inode);
1611}
1612
1613static void gfs2_destroy_inode(struct inode *inode)
1614{
1615        call_rcu(&inode->i_rcu, gfs2_i_callback);
1616}
1617
1618const struct super_operations gfs2_super_ops = {
1619        .alloc_inode            = gfs2_alloc_inode,
1620        .destroy_inode          = gfs2_destroy_inode,
1621        .write_inode            = gfs2_write_inode,
1622        .dirty_inode            = gfs2_dirty_inode,
1623        .evict_inode            = gfs2_evict_inode,
1624        .put_super              = gfs2_put_super,
1625        .sync_fs                = gfs2_sync_fs,
1626        .freeze_fs              = gfs2_freeze,
1627        .unfreeze_fs            = gfs2_unfreeze,
1628        .statfs                 = gfs2_statfs,
1629        .remount_fs             = gfs2_remount_fs,
1630        .drop_inode             = gfs2_drop_inode,
1631        .show_options           = gfs2_show_options,
1632};
1633
1634
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