linux/fs/gfs2/super.c
<<
>>
Prefs
   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
  47enum dinode_demise {
  48        SHOULD_DELETE_DINODE,
  49        SHOULD_NOT_DELETE_DINODE,
  50        SHOULD_DEFER_EVICTION,
  51};
  52
  53/**
  54 * gfs2_jindex_free - Clear all the journal index information
  55 * @sdp: The GFS2 superblock
  56 *
  57 */
  58
  59void gfs2_jindex_free(struct gfs2_sbd *sdp)
  60{
  61        struct list_head list;
  62        struct gfs2_jdesc *jd;
  63
  64        spin_lock(&sdp->sd_jindex_spin);
  65        list_add(&list, &sdp->sd_jindex_list);
  66        list_del_init(&sdp->sd_jindex_list);
  67        sdp->sd_journals = 0;
  68        spin_unlock(&sdp->sd_jindex_spin);
  69
  70        sdp->sd_jdesc = NULL;
  71        while (!list_empty(&list)) {
  72                jd = list_first_entry(&list, struct gfs2_jdesc, jd_list);
  73                gfs2_free_journal_extents(jd);
  74                list_del(&jd->jd_list);
  75                iput(jd->jd_inode);
  76                jd->jd_inode = NULL;
  77                kfree(jd);
  78        }
  79}
  80
  81static struct gfs2_jdesc *jdesc_find_i(struct list_head *head, unsigned int jid)
  82{
  83        struct gfs2_jdesc *jd;
  84
  85        list_for_each_entry(jd, head, jd_list) {
  86                if (jd->jd_jid == jid)
  87                        return jd;
  88        }
  89        return NULL;
  90}
  91
  92struct gfs2_jdesc *gfs2_jdesc_find(struct gfs2_sbd *sdp, unsigned int jid)
  93{
  94        struct gfs2_jdesc *jd;
  95
  96        spin_lock(&sdp->sd_jindex_spin);
  97        jd = jdesc_find_i(&sdp->sd_jindex_list, jid);
  98        spin_unlock(&sdp->sd_jindex_spin);
  99
 100        return jd;
 101}
 102
 103int gfs2_jdesc_check(struct gfs2_jdesc *jd)
 104{
 105        struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
 106        struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
 107        u64 size = i_size_read(jd->jd_inode);
 108
 109        if (gfs2_check_internal_file_size(jd->jd_inode, 8 << 20, BIT(30)))
 110                return -EIO;
 111
 112        jd->jd_blocks = size >> sdp->sd_sb.sb_bsize_shift;
 113
 114        if (gfs2_write_alloc_required(ip, 0, size)) {
 115                gfs2_consist_inode(ip);
 116                return -EIO;
 117        }
 118
 119        return 0;
 120}
 121
 122/**
 123 * gfs2_make_fs_rw - Turn a Read-Only FS into a Read-Write one
 124 * @sdp: the filesystem
 125 *
 126 * Returns: errno
 127 */
 128
 129int gfs2_make_fs_rw(struct gfs2_sbd *sdp)
 130{
 131        struct gfs2_inode *ip = GFS2_I(sdp->sd_jdesc->jd_inode);
 132        struct gfs2_glock *j_gl = ip->i_gl;
 133        struct gfs2_log_header_host head;
 134        int error;
 135
 136        j_gl->gl_ops->go_inval(j_gl, DIO_METADATA);
 137        if (gfs2_withdrawn(sdp))
 138                return -EIO;
 139
 140        error = gfs2_find_jhead(sdp->sd_jdesc, &head, false);
 141        if (error || gfs2_withdrawn(sdp))
 142                return error;
 143
 144        if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) {
 145                gfs2_consist(sdp);
 146                return -EIO;
 147        }
 148
 149        /*  Initialize some head of the log stuff  */
 150        sdp->sd_log_sequence = head.lh_sequence + 1;
 151        gfs2_log_pointers_init(sdp, head.lh_blkno);
 152
 153        error = gfs2_quota_init(sdp);
 154        if (!error && !gfs2_withdrawn(sdp))
 155                set_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags);
 156        return error;
 157}
 158
 159void gfs2_statfs_change_in(struct gfs2_statfs_change_host *sc, const void *buf)
 160{
 161        const struct gfs2_statfs_change *str = buf;
 162
 163        sc->sc_total = be64_to_cpu(str->sc_total);
 164        sc->sc_free = be64_to_cpu(str->sc_free);
 165        sc->sc_dinodes = be64_to_cpu(str->sc_dinodes);
 166}
 167
 168void gfs2_statfs_change_out(const struct gfs2_statfs_change_host *sc, void *buf)
 169{
 170        struct gfs2_statfs_change *str = buf;
 171
 172        str->sc_total = cpu_to_be64(sc->sc_total);
 173        str->sc_free = cpu_to_be64(sc->sc_free);
 174        str->sc_dinodes = cpu_to_be64(sc->sc_dinodes);
 175}
 176
 177int gfs2_statfs_init(struct gfs2_sbd *sdp)
 178{
 179        struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
 180        struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
 181        struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
 182        struct buffer_head *m_bh;
 183        struct gfs2_holder gh;
 184        int error;
 185
 186        error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE,
 187                                   &gh);
 188        if (error)
 189                return error;
 190
 191        error = gfs2_meta_inode_buffer(m_ip, &m_bh);
 192        if (error)
 193                goto out;
 194
 195        if (sdp->sd_args.ar_spectator) {
 196                spin_lock(&sdp->sd_statfs_spin);
 197                gfs2_statfs_change_in(m_sc, m_bh->b_data +
 198                                      sizeof(struct gfs2_dinode));
 199                spin_unlock(&sdp->sd_statfs_spin);
 200        } else {
 201                spin_lock(&sdp->sd_statfs_spin);
 202                gfs2_statfs_change_in(m_sc, m_bh->b_data +
 203                                      sizeof(struct gfs2_dinode));
 204                gfs2_statfs_change_in(l_sc, sdp->sd_sc_bh->b_data +
 205                                      sizeof(struct gfs2_dinode));
 206                spin_unlock(&sdp->sd_statfs_spin);
 207
 208        }
 209
 210        brelse(m_bh);
 211out:
 212        gfs2_glock_dq_uninit(&gh);
 213        return 0;
 214}
 215
 216void gfs2_statfs_change(struct gfs2_sbd *sdp, s64 total, s64 free,
 217                        s64 dinodes)
 218{
 219        struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
 220        struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
 221        struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
 222        s64 x, y;
 223        int need_sync = 0;
 224
 225        gfs2_trans_add_meta(l_ip->i_gl, sdp->sd_sc_bh);
 226
 227        spin_lock(&sdp->sd_statfs_spin);
 228        l_sc->sc_total += total;
 229        l_sc->sc_free += free;
 230        l_sc->sc_dinodes += dinodes;
 231        gfs2_statfs_change_out(l_sc, sdp->sd_sc_bh->b_data +
 232                               sizeof(struct gfs2_dinode));
 233        if (sdp->sd_args.ar_statfs_percent) {
 234                x = 100 * l_sc->sc_free;
 235                y = m_sc->sc_free * sdp->sd_args.ar_statfs_percent;
 236                if (x >= y || x <= -y)
 237                        need_sync = 1;
 238        }
 239        spin_unlock(&sdp->sd_statfs_spin);
 240
 241        if (need_sync)
 242                gfs2_wake_up_statfs(sdp);
 243}
 244
 245void update_statfs(struct gfs2_sbd *sdp, struct buffer_head *m_bh)
 246{
 247        struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
 248        struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
 249        struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
 250        struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
 251
 252        gfs2_trans_add_meta(l_ip->i_gl, sdp->sd_sc_bh);
 253        gfs2_trans_add_meta(m_ip->i_gl, m_bh);
 254
 255        spin_lock(&sdp->sd_statfs_spin);
 256        m_sc->sc_total += l_sc->sc_total;
 257        m_sc->sc_free += l_sc->sc_free;
 258        m_sc->sc_dinodes += l_sc->sc_dinodes;
 259        memset(l_sc, 0, sizeof(struct gfs2_statfs_change));
 260        memset(sdp->sd_sc_bh->b_data + sizeof(struct gfs2_dinode),
 261               0, sizeof(struct gfs2_statfs_change));
 262        gfs2_statfs_change_out(m_sc, m_bh->b_data + sizeof(struct gfs2_dinode));
 263        spin_unlock(&sdp->sd_statfs_spin);
 264}
 265
 266int gfs2_statfs_sync(struct super_block *sb, int type)
 267{
 268        struct gfs2_sbd *sdp = sb->s_fs_info;
 269        struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
 270        struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
 271        struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
 272        struct gfs2_holder gh;
 273        struct buffer_head *m_bh;
 274        int error;
 275
 276        error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE,
 277                                   &gh);
 278        if (error)
 279                goto out;
 280
 281        error = gfs2_meta_inode_buffer(m_ip, &m_bh);
 282        if (error)
 283                goto out_unlock;
 284
 285        spin_lock(&sdp->sd_statfs_spin);
 286        gfs2_statfs_change_in(m_sc, m_bh->b_data +
 287                              sizeof(struct gfs2_dinode));
 288        if (!l_sc->sc_total && !l_sc->sc_free && !l_sc->sc_dinodes) {
 289                spin_unlock(&sdp->sd_statfs_spin);
 290                goto out_bh;
 291        }
 292        spin_unlock(&sdp->sd_statfs_spin);
 293
 294        error = gfs2_trans_begin(sdp, 2 * RES_DINODE, 0);
 295        if (error)
 296                goto out_bh;
 297
 298        update_statfs(sdp, m_bh);
 299        sdp->sd_statfs_force_sync = 0;
 300
 301        gfs2_trans_end(sdp);
 302
 303out_bh:
 304        brelse(m_bh);
 305out_unlock:
 306        gfs2_glock_dq_uninit(&gh);
 307out:
 308        return error;
 309}
 310
 311struct lfcc {
 312        struct list_head list;
 313        struct gfs2_holder gh;
 314};
 315
 316/**
 317 * gfs2_lock_fs_check_clean - Stop all writes to the FS and check that all
 318 *                            journals are clean
 319 * @sdp: the file system
 320 *
 321 * Returns: errno
 322 */
 323
 324static int gfs2_lock_fs_check_clean(struct gfs2_sbd *sdp)
 325{
 326        struct gfs2_inode *ip;
 327        struct gfs2_jdesc *jd;
 328        struct lfcc *lfcc;
 329        LIST_HEAD(list);
 330        struct gfs2_log_header_host lh;
 331        int error;
 332
 333        list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
 334                lfcc = kmalloc(sizeof(struct lfcc), GFP_KERNEL);
 335                if (!lfcc) {
 336                        error = -ENOMEM;
 337                        goto out;
 338                }
 339                ip = GFS2_I(jd->jd_inode);
 340                error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &lfcc->gh);
 341                if (error) {
 342                        kfree(lfcc);
 343                        goto out;
 344                }
 345                list_add(&lfcc->list, &list);
 346        }
 347
 348        error = gfs2_glock_nq_init(sdp->sd_freeze_gl, LM_ST_EXCLUSIVE,
 349                                   LM_FLAG_NOEXP, &sdp->sd_freeze_gh);
 350        if (error)
 351                goto out;
 352
 353        list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
 354                error = gfs2_jdesc_check(jd);
 355                if (error)
 356                        break;
 357                error = gfs2_find_jhead(jd, &lh, false);
 358                if (error)
 359                        break;
 360                if (!(lh.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) {
 361                        error = -EBUSY;
 362                        break;
 363                }
 364        }
 365
 366        if (error)
 367                gfs2_freeze_unlock(&sdp->sd_freeze_gh);
 368
 369out:
 370        while (!list_empty(&list)) {
 371                lfcc = list_first_entry(&list, struct lfcc, list);
 372                list_del(&lfcc->list);
 373                gfs2_glock_dq_uninit(&lfcc->gh);
 374                kfree(lfcc);
 375        }
 376        return error;
 377}
 378
 379void gfs2_dinode_out(const struct gfs2_inode *ip, void *buf)
 380{
 381        struct gfs2_dinode *str = buf;
 382
 383        str->di_header.mh_magic = cpu_to_be32(GFS2_MAGIC);
 384        str->di_header.mh_type = cpu_to_be32(GFS2_METATYPE_DI);
 385        str->di_header.mh_format = cpu_to_be32(GFS2_FORMAT_DI);
 386        str->di_num.no_addr = cpu_to_be64(ip->i_no_addr);
 387        str->di_num.no_formal_ino = cpu_to_be64(ip->i_no_formal_ino);
 388        str->di_mode = cpu_to_be32(ip->i_inode.i_mode);
 389        str->di_uid = cpu_to_be32(i_uid_read(&ip->i_inode));
 390        str->di_gid = cpu_to_be32(i_gid_read(&ip->i_inode));
 391        str->di_nlink = cpu_to_be32(ip->i_inode.i_nlink);
 392        str->di_size = cpu_to_be64(i_size_read(&ip->i_inode));
 393        str->di_blocks = cpu_to_be64(gfs2_get_inode_blocks(&ip->i_inode));
 394        str->di_atime = cpu_to_be64(ip->i_inode.i_atime.tv_sec);
 395        str->di_mtime = cpu_to_be64(ip->i_inode.i_mtime.tv_sec);
 396        str->di_ctime = cpu_to_be64(ip->i_inode.i_ctime.tv_sec);
 397
 398        str->di_goal_meta = cpu_to_be64(ip->i_goal);
 399        str->di_goal_data = cpu_to_be64(ip->i_goal);
 400        str->di_generation = cpu_to_be64(ip->i_generation);
 401
 402        str->di_flags = cpu_to_be32(ip->i_diskflags);
 403        str->di_height = cpu_to_be16(ip->i_height);
 404        str->di_payload_format = cpu_to_be32(S_ISDIR(ip->i_inode.i_mode) &&
 405                                             !(ip->i_diskflags & GFS2_DIF_EXHASH) ?
 406                                             GFS2_FORMAT_DE : 0);
 407        str->di_depth = cpu_to_be16(ip->i_depth);
 408        str->di_entries = cpu_to_be32(ip->i_entries);
 409
 410        str->di_eattr = cpu_to_be64(ip->i_eattr);
 411        str->di_atime_nsec = cpu_to_be32(ip->i_inode.i_atime.tv_nsec);
 412        str->di_mtime_nsec = cpu_to_be32(ip->i_inode.i_mtime.tv_nsec);
 413        str->di_ctime_nsec = cpu_to_be32(ip->i_inode.i_ctime.tv_nsec);
 414}
 415
 416/**
 417 * gfs2_write_inode - Make sure the inode is stable on the disk
 418 * @inode: The inode
 419 * @wbc: The writeback control structure
 420 *
 421 * Returns: errno
 422 */
 423
 424static int gfs2_write_inode(struct inode *inode, struct writeback_control *wbc)
 425{
 426        struct gfs2_inode *ip = GFS2_I(inode);
 427        struct gfs2_sbd *sdp = GFS2_SB(inode);
 428        struct address_space *metamapping = gfs2_glock2aspace(ip->i_gl);
 429        struct backing_dev_info *bdi = inode_to_bdi(metamapping->host);
 430        int ret = 0;
 431        bool flush_all = (wbc->sync_mode == WB_SYNC_ALL || gfs2_is_jdata(ip));
 432
 433        if (flush_all)
 434                gfs2_log_flush(GFS2_SB(inode), ip->i_gl,
 435                               GFS2_LOG_HEAD_FLUSH_NORMAL |
 436                               GFS2_LFC_WRITE_INODE);
 437        if (bdi->wb.dirty_exceeded)
 438                gfs2_ail1_flush(sdp, wbc);
 439        else
 440                filemap_fdatawrite(metamapping);
 441        if (flush_all)
 442                ret = filemap_fdatawait(metamapping);
 443        if (ret)
 444                mark_inode_dirty_sync(inode);
 445        else {
 446                spin_lock(&inode->i_lock);
 447                if (!(inode->i_flags & I_DIRTY))
 448                        gfs2_ordered_del_inode(ip);
 449                spin_unlock(&inode->i_lock);
 450        }
 451        return ret;
 452}
 453
 454/**
 455 * gfs2_dirty_inode - check for atime updates
 456 * @inode: The inode in question
 457 * @flags: The type of dirty
 458 *
 459 * Unfortunately it can be called under any combination of inode
 460 * glock and transaction lock, so we have to check carefully.
 461 *
 462 * At the moment this deals only with atime - it should be possible
 463 * to expand that role in future, once a review of the locking has
 464 * been carried out.
 465 */
 466
 467static void gfs2_dirty_inode(struct inode *inode, int flags)
 468{
 469        struct gfs2_inode *ip = GFS2_I(inode);
 470        struct gfs2_sbd *sdp = GFS2_SB(inode);
 471        struct buffer_head *bh;
 472        struct gfs2_holder gh;
 473        int need_unlock = 0;
 474        int need_endtrans = 0;
 475        int ret;
 476
 477        if (unlikely(gfs2_withdrawn(sdp)))
 478                return;
 479        if (!gfs2_glock_is_locked_by_me(ip->i_gl)) {
 480                ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
 481                if (ret) {
 482                        fs_err(sdp, "dirty_inode: glock %d\n", ret);
 483                        gfs2_dump_glock(NULL, ip->i_gl, true);
 484                        return;
 485                }
 486                need_unlock = 1;
 487        } else if (WARN_ON_ONCE(ip->i_gl->gl_state != LM_ST_EXCLUSIVE))
 488                return;
 489
 490        if (current->journal_info == NULL) {
 491                ret = gfs2_trans_begin(sdp, RES_DINODE, 0);
 492                if (ret) {
 493                        fs_err(sdp, "dirty_inode: gfs2_trans_begin %d\n", ret);
 494                        goto out;
 495                }
 496                need_endtrans = 1;
 497        }
 498
 499        ret = gfs2_meta_inode_buffer(ip, &bh);
 500        if (ret == 0) {
 501                gfs2_trans_add_meta(ip->i_gl, bh);
 502                gfs2_dinode_out(ip, bh->b_data);
 503                brelse(bh);
 504        }
 505
 506        if (need_endtrans)
 507                gfs2_trans_end(sdp);
 508out:
 509        if (need_unlock)
 510                gfs2_glock_dq_uninit(&gh);
 511}
 512
 513/**
 514 * gfs2_make_fs_ro - Turn a Read-Write FS into a Read-Only one
 515 * @sdp: the filesystem
 516 *
 517 * Returns: errno
 518 */
 519
 520void gfs2_make_fs_ro(struct gfs2_sbd *sdp)
 521{
 522        int log_write_allowed = test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags);
 523
 524        gfs2_flush_delete_work(sdp);
 525        if (!log_write_allowed && current == sdp->sd_quotad_process)
 526                fs_warn(sdp, "The quotad daemon is withdrawing.\n");
 527        else if (sdp->sd_quotad_process)
 528                kthread_stop(sdp->sd_quotad_process);
 529        sdp->sd_quotad_process = NULL;
 530
 531        if (!log_write_allowed && current == sdp->sd_logd_process)
 532                fs_warn(sdp, "The logd daemon is withdrawing.\n");
 533        else if (sdp->sd_logd_process)
 534                kthread_stop(sdp->sd_logd_process);
 535        sdp->sd_logd_process = NULL;
 536
 537        if (log_write_allowed) {
 538                gfs2_quota_sync(sdp->sd_vfs, 0);
 539                gfs2_statfs_sync(sdp->sd_vfs, 0);
 540
 541                gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_SHUTDOWN |
 542                               GFS2_LFC_MAKE_FS_RO);
 543                wait_event_timeout(sdp->sd_log_waitq,
 544                                   gfs2_log_is_empty(sdp),
 545                                   HZ * 5);
 546                gfs2_assert_warn(sdp, gfs2_log_is_empty(sdp));
 547        } else {
 548                wait_event_timeout(sdp->sd_log_waitq,
 549                                   gfs2_log_is_empty(sdp),
 550                                   HZ * 5);
 551        }
 552        gfs2_quota_cleanup(sdp);
 553
 554        if (!log_write_allowed)
 555                sdp->sd_vfs->s_flags |= SB_RDONLY;
 556}
 557
 558/**
 559 * gfs2_put_super - Unmount the filesystem
 560 * @sb: The VFS superblock
 561 *
 562 */
 563
 564static void gfs2_put_super(struct super_block *sb)
 565{
 566        struct gfs2_sbd *sdp = sb->s_fs_info;
 567        struct gfs2_jdesc *jd;
 568
 569        /* No more recovery requests */
 570        set_bit(SDF_NORECOVERY, &sdp->sd_flags);
 571        smp_mb();
 572
 573        /* Wait on outstanding recovery */
 574restart:
 575        spin_lock(&sdp->sd_jindex_spin);
 576        list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
 577                if (!test_bit(JDF_RECOVERY, &jd->jd_flags))
 578                        continue;
 579                spin_unlock(&sdp->sd_jindex_spin);
 580                wait_on_bit(&jd->jd_flags, JDF_RECOVERY,
 581                            TASK_UNINTERRUPTIBLE);
 582                goto restart;
 583        }
 584        spin_unlock(&sdp->sd_jindex_spin);
 585
 586        if (!sb_rdonly(sb)) {
 587                gfs2_make_fs_ro(sdp);
 588        }
 589        WARN_ON(gfs2_withdrawing(sdp));
 590
 591        /*  At this point, we're through modifying the disk  */
 592
 593        /*  Release stuff  */
 594
 595        iput(sdp->sd_jindex);
 596        iput(sdp->sd_statfs_inode);
 597        iput(sdp->sd_rindex);
 598        iput(sdp->sd_quota_inode);
 599
 600        gfs2_glock_put(sdp->sd_rename_gl);
 601        gfs2_glock_put(sdp->sd_freeze_gl);
 602
 603        if (!sdp->sd_args.ar_spectator) {
 604                if (gfs2_holder_initialized(&sdp->sd_journal_gh))
 605                        gfs2_glock_dq_uninit(&sdp->sd_journal_gh);
 606                if (gfs2_holder_initialized(&sdp->sd_jinode_gh))
 607                        gfs2_glock_dq_uninit(&sdp->sd_jinode_gh);
 608                brelse(sdp->sd_sc_bh);
 609                gfs2_glock_dq_uninit(&sdp->sd_sc_gh);
 610                gfs2_glock_dq_uninit(&sdp->sd_qc_gh);
 611                free_local_statfs_inodes(sdp);
 612                iput(sdp->sd_qc_inode);
 613        }
 614
 615        gfs2_glock_dq_uninit(&sdp->sd_live_gh);
 616        gfs2_clear_rgrpd(sdp);
 617        gfs2_jindex_free(sdp);
 618        /*  Take apart glock structures and buffer lists  */
 619        gfs2_gl_hash_clear(sdp);
 620        truncate_inode_pages_final(&sdp->sd_aspace);
 621        gfs2_delete_debugfs_file(sdp);
 622        /*  Unmount the locking protocol  */
 623        gfs2_lm_unmount(sdp);
 624
 625        /*  At this point, we're through participating in the lockspace  */
 626        gfs2_sys_fs_del(sdp);
 627        free_sbd(sdp);
 628}
 629
 630/**
 631 * gfs2_sync_fs - sync the filesystem
 632 * @sb: the superblock
 633 * @wait: true to wait for completion
 634 *
 635 * Flushes the log to disk.
 636 */
 637
 638static int gfs2_sync_fs(struct super_block *sb, int wait)
 639{
 640        struct gfs2_sbd *sdp = sb->s_fs_info;
 641
 642        gfs2_quota_sync(sb, -1);
 643        if (wait)
 644                gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_NORMAL |
 645                               GFS2_LFC_SYNC_FS);
 646        return sdp->sd_log_error;
 647}
 648
 649void gfs2_freeze_func(struct work_struct *work)
 650{
 651        int error;
 652        struct gfs2_holder freeze_gh;
 653        struct gfs2_sbd *sdp = container_of(work, struct gfs2_sbd, sd_freeze_work);
 654        struct super_block *sb = sdp->sd_vfs;
 655
 656        atomic_inc(&sb->s_active);
 657        error = gfs2_freeze_lock(sdp, &freeze_gh, 0);
 658        if (error) {
 659                gfs2_assert_withdraw(sdp, 0);
 660        } else {
 661                atomic_set(&sdp->sd_freeze_state, SFS_UNFROZEN);
 662                error = thaw_super(sb);
 663                if (error) {
 664                        fs_info(sdp, "GFS2: couldn't thaw filesystem: %d\n",
 665                                error);
 666                        gfs2_assert_withdraw(sdp, 0);
 667                }
 668                gfs2_freeze_unlock(&freeze_gh);
 669        }
 670        deactivate_super(sb);
 671        clear_bit_unlock(SDF_FS_FROZEN, &sdp->sd_flags);
 672        wake_up_bit(&sdp->sd_flags, SDF_FS_FROZEN);
 673        return;
 674}
 675
 676/**
 677 * gfs2_freeze - prevent further writes to the filesystem
 678 * @sb: the VFS structure for the filesystem
 679 *
 680 */
 681
 682static int gfs2_freeze(struct super_block *sb)
 683{
 684        struct gfs2_sbd *sdp = sb->s_fs_info;
 685        int error;
 686
 687        mutex_lock(&sdp->sd_freeze_mutex);
 688        if (atomic_read(&sdp->sd_freeze_state) != SFS_UNFROZEN) {
 689                error = -EBUSY;
 690                goto out;
 691        }
 692
 693        for (;;) {
 694                if (gfs2_withdrawn(sdp)) {
 695                        error = -EINVAL;
 696                        goto out;
 697                }
 698
 699                error = gfs2_lock_fs_check_clean(sdp);
 700                if (!error)
 701                        break;
 702
 703                if (error == -EBUSY)
 704                        fs_err(sdp, "waiting for recovery before freeze\n");
 705                else if (error == -EIO) {
 706                        fs_err(sdp, "Fatal IO error: cannot freeze gfs2 due "
 707                               "to recovery error.\n");
 708                        goto out;
 709                } else {
 710                        fs_err(sdp, "error freezing FS: %d\n", error);
 711                }
 712                fs_err(sdp, "retrying...\n");
 713                msleep(1000);
 714        }
 715        set_bit(SDF_FS_FROZEN, &sdp->sd_flags);
 716out:
 717        mutex_unlock(&sdp->sd_freeze_mutex);
 718        return error;
 719}
 720
 721/**
 722 * gfs2_unfreeze - reallow writes to the filesystem
 723 * @sb: the VFS structure for the filesystem
 724 *
 725 */
 726
 727static int gfs2_unfreeze(struct super_block *sb)
 728{
 729        struct gfs2_sbd *sdp = sb->s_fs_info;
 730
 731        mutex_lock(&sdp->sd_freeze_mutex);
 732        if (atomic_read(&sdp->sd_freeze_state) != SFS_FROZEN ||
 733            !gfs2_holder_initialized(&sdp->sd_freeze_gh)) {
 734                mutex_unlock(&sdp->sd_freeze_mutex);
 735                return -EINVAL;
 736        }
 737
 738        gfs2_freeze_unlock(&sdp->sd_freeze_gh);
 739        mutex_unlock(&sdp->sd_freeze_mutex);
 740        return wait_on_bit(&sdp->sd_flags, SDF_FS_FROZEN, TASK_INTERRUPTIBLE);
 741}
 742
 743/**
 744 * statfs_slow_fill - fill in the sg for a given RG
 745 * @rgd: the RG
 746 * @sc: the sc structure
 747 *
 748 * Returns: 0 on success, -ESTALE if the LVB is invalid
 749 */
 750
 751static int statfs_slow_fill(struct gfs2_rgrpd *rgd,
 752                            struct gfs2_statfs_change_host *sc)
 753{
 754        gfs2_rgrp_verify(rgd);
 755        sc->sc_total += rgd->rd_data;
 756        sc->sc_free += rgd->rd_free;
 757        sc->sc_dinodes += rgd->rd_dinodes;
 758        return 0;
 759}
 760
 761/**
 762 * gfs2_statfs_slow - Stat a filesystem using asynchronous locking
 763 * @sdp: the filesystem
 764 * @sc: the sc info that will be returned
 765 *
 766 * Any error (other than a signal) will cause this routine to fall back
 767 * to the synchronous version.
 768 *
 769 * FIXME: This really shouldn't busy wait like this.
 770 *
 771 * Returns: errno
 772 */
 773
 774static int gfs2_statfs_slow(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *sc)
 775{
 776        struct gfs2_rgrpd *rgd_next;
 777        struct gfs2_holder *gha, *gh;
 778        unsigned int slots = 64;
 779        unsigned int x;
 780        int done;
 781        int error = 0, err;
 782
 783        memset(sc, 0, sizeof(struct gfs2_statfs_change_host));
 784        gha = kmalloc_array(slots, sizeof(struct gfs2_holder), GFP_KERNEL);
 785        if (!gha)
 786                return -ENOMEM;
 787        for (x = 0; x < slots; x++)
 788                gfs2_holder_mark_uninitialized(gha + x);
 789
 790        rgd_next = gfs2_rgrpd_get_first(sdp);
 791
 792        for (;;) {
 793                done = 1;
 794
 795                for (x = 0; x < slots; x++) {
 796                        gh = gha + x;
 797
 798                        if (gfs2_holder_initialized(gh) && gfs2_glock_poll(gh)) {
 799                                err = gfs2_glock_wait(gh);
 800                                if (err) {
 801                                        gfs2_holder_uninit(gh);
 802                                        error = err;
 803                                } else {
 804                                        if (!error) {
 805                                                struct gfs2_rgrpd *rgd =
 806                                                        gfs2_glock2rgrp(gh->gh_gl);
 807
 808                                                error = statfs_slow_fill(rgd, sc);
 809                                        }
 810                                        gfs2_glock_dq_uninit(gh);
 811                                }
 812                        }
 813
 814                        if (gfs2_holder_initialized(gh))
 815                                done = 0;
 816                        else if (rgd_next && !error) {
 817                                error = gfs2_glock_nq_init(rgd_next->rd_gl,
 818                                                           LM_ST_SHARED,
 819                                                           GL_ASYNC,
 820                                                           gh);
 821                                rgd_next = gfs2_rgrpd_get_next(rgd_next);
 822                                done = 0;
 823                        }
 824
 825                        if (signal_pending(current))
 826                                error = -ERESTARTSYS;
 827                }
 828
 829                if (done)
 830                        break;
 831
 832                yield();
 833        }
 834
 835        kfree(gha);
 836        return error;
 837}
 838
 839/**
 840 * gfs2_statfs_i - Do a statfs
 841 * @sdp: the filesystem
 842 * @sc: the sc structure
 843 *
 844 * Returns: errno
 845 */
 846
 847static int gfs2_statfs_i(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *sc)
 848{
 849        struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
 850        struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
 851
 852        spin_lock(&sdp->sd_statfs_spin);
 853
 854        *sc = *m_sc;
 855        sc->sc_total += l_sc->sc_total;
 856        sc->sc_free += l_sc->sc_free;
 857        sc->sc_dinodes += l_sc->sc_dinodes;
 858
 859        spin_unlock(&sdp->sd_statfs_spin);
 860
 861        if (sc->sc_free < 0)
 862                sc->sc_free = 0;
 863        if (sc->sc_free > sc->sc_total)
 864                sc->sc_free = sc->sc_total;
 865        if (sc->sc_dinodes < 0)
 866                sc->sc_dinodes = 0;
 867
 868        return 0;
 869}
 870
 871/**
 872 * gfs2_statfs - Gather and return stats about the filesystem
 873 * @dentry: The name of the link
 874 * @buf: The buffer
 875 *
 876 * Returns: 0 on success or error code
 877 */
 878
 879static int gfs2_statfs(struct dentry *dentry, struct kstatfs *buf)
 880{
 881        struct super_block *sb = dentry->d_sb;
 882        struct gfs2_sbd *sdp = sb->s_fs_info;
 883        struct gfs2_statfs_change_host sc;
 884        int error;
 885
 886        error = gfs2_rindex_update(sdp);
 887        if (error)
 888                return error;
 889
 890        if (gfs2_tune_get(sdp, gt_statfs_slow))
 891                error = gfs2_statfs_slow(sdp, &sc);
 892        else
 893                error = gfs2_statfs_i(sdp, &sc);
 894
 895        if (error)
 896                return error;
 897
 898        buf->f_type = GFS2_MAGIC;
 899        buf->f_bsize = sdp->sd_sb.sb_bsize;
 900        buf->f_blocks = sc.sc_total;
 901        buf->f_bfree = sc.sc_free;
 902        buf->f_bavail = sc.sc_free;
 903        buf->f_files = sc.sc_dinodes + sc.sc_free;
 904        buf->f_ffree = sc.sc_free;
 905        buf->f_namelen = GFS2_FNAMESIZE;
 906
 907        return 0;
 908}
 909
 910/**
 911 * gfs2_drop_inode - Drop an inode (test for remote unlink)
 912 * @inode: The inode to drop
 913 *
 914 * If we've received a callback on an iopen lock then it's because a
 915 * remote node tried to deallocate the inode but failed due to this node
 916 * still having the inode open. Here we mark the link count zero
 917 * since we know that it must have reached zero if the GLF_DEMOTE flag
 918 * is set on the iopen glock. If we didn't do a disk read since the
 919 * remote node removed the final link then we might otherwise miss
 920 * this event. This check ensures that this node will deallocate the
 921 * inode's blocks, or alternatively pass the baton on to another
 922 * node for later deallocation.
 923 */
 924
 925static int gfs2_drop_inode(struct inode *inode)
 926{
 927        struct gfs2_inode *ip = GFS2_I(inode);
 928
 929        if (!test_bit(GIF_FREE_VFS_INODE, &ip->i_flags) &&
 930            inode->i_nlink &&
 931            gfs2_holder_initialized(&ip->i_iopen_gh)) {
 932                struct gfs2_glock *gl = ip->i_iopen_gh.gh_gl;
 933                if (test_bit(GLF_DEMOTE, &gl->gl_flags))
 934                        clear_nlink(inode);
 935        }
 936
 937        /*
 938         * When under memory pressure when an inode's link count has dropped to
 939         * zero, defer deleting the inode to the delete workqueue.  This avoids
 940         * calling into DLM under memory pressure, which can deadlock.
 941         */
 942        if (!inode->i_nlink &&
 943            unlikely(current->flags & PF_MEMALLOC) &&
 944            gfs2_holder_initialized(&ip->i_iopen_gh)) {
 945                struct gfs2_glock *gl = ip->i_iopen_gh.gh_gl;
 946
 947                gfs2_glock_hold(gl);
 948                if (!gfs2_queue_delete_work(gl, 0))
 949                        gfs2_glock_queue_put(gl);
 950                return 0;
 951        }
 952
 953        return generic_drop_inode(inode);
 954}
 955
 956static int is_ancestor(const struct dentry *d1, const struct dentry *d2)
 957{
 958        do {
 959                if (d1 == d2)
 960                        return 1;
 961                d1 = d1->d_parent;
 962        } while (!IS_ROOT(d1));
 963        return 0;
 964}
 965
 966/**
 967 * gfs2_show_options - Show mount options for /proc/mounts
 968 * @s: seq_file structure
 969 * @root: root of this (sub)tree
 970 *
 971 * Returns: 0 on success or error code
 972 */
 973
 974static int gfs2_show_options(struct seq_file *s, struct dentry *root)
 975{
 976        struct gfs2_sbd *sdp = root->d_sb->s_fs_info;
 977        struct gfs2_args *args = &sdp->sd_args;
 978        int val;
 979
 980        if (is_ancestor(root, sdp->sd_master_dir))
 981                seq_puts(s, ",meta");
 982        if (args->ar_lockproto[0])
 983                seq_show_option(s, "lockproto", args->ar_lockproto);
 984        if (args->ar_locktable[0])
 985                seq_show_option(s, "locktable", args->ar_locktable);
 986        if (args->ar_hostdata[0])
 987                seq_show_option(s, "hostdata", args->ar_hostdata);
 988        if (args->ar_spectator)
 989                seq_puts(s, ",spectator");
 990        if (args->ar_localflocks)
 991                seq_puts(s, ",localflocks");
 992        if (args->ar_debug)
 993                seq_puts(s, ",debug");
 994        if (args->ar_posix_acl)
 995                seq_puts(s, ",acl");
 996        if (args->ar_quota != GFS2_QUOTA_DEFAULT) {
 997                char *state;
 998                switch (args->ar_quota) {
 999                case GFS2_QUOTA_OFF:
1000                        state = "off";
1001                        break;
1002                case GFS2_QUOTA_ACCOUNT:
1003                        state = "account";
1004                        break;
1005                case GFS2_QUOTA_ON:
1006                        state = "on";
1007                        break;
1008                default:
1009                        state = "unknown";
1010                        break;
1011                }
1012                seq_printf(s, ",quota=%s", state);
1013        }
1014        if (args->ar_suiddir)
1015                seq_puts(s, ",suiddir");
1016        if (args->ar_data != GFS2_DATA_DEFAULT) {
1017                char *state;
1018                switch (args->ar_data) {
1019                case GFS2_DATA_WRITEBACK:
1020                        state = "writeback";
1021                        break;
1022                case GFS2_DATA_ORDERED:
1023                        state = "ordered";
1024                        break;
1025                default:
1026                        state = "unknown";
1027                        break;
1028                }
1029                seq_printf(s, ",data=%s", state);
1030        }
1031        if (args->ar_discard)
1032                seq_puts(s, ",discard");
1033        val = sdp->sd_tune.gt_logd_secs;
1034        if (val != 30)
1035                seq_printf(s, ",commit=%d", val);
1036        val = sdp->sd_tune.gt_statfs_quantum;
1037        if (val != 30)
1038                seq_printf(s, ",statfs_quantum=%d", val);
1039        else if (sdp->sd_tune.gt_statfs_slow)
1040                seq_puts(s, ",statfs_quantum=0");
1041        val = sdp->sd_tune.gt_quota_quantum;
1042        if (val != 60)
1043                seq_printf(s, ",quota_quantum=%d", val);
1044        if (args->ar_statfs_percent)
1045                seq_printf(s, ",statfs_percent=%d", args->ar_statfs_percent);
1046        if (args->ar_errors != GFS2_ERRORS_DEFAULT) {
1047                const char *state;
1048
1049                switch (args->ar_errors) {
1050                case GFS2_ERRORS_WITHDRAW:
1051                        state = "withdraw";
1052                        break;
1053                case GFS2_ERRORS_PANIC:
1054                        state = "panic";
1055                        break;
1056                default:
1057                        state = "unknown";
1058                        break;
1059                }
1060                seq_printf(s, ",errors=%s", state);
1061        }
1062        if (test_bit(SDF_NOBARRIERS, &sdp->sd_flags))
1063                seq_puts(s, ",nobarrier");
1064        if (test_bit(SDF_DEMOTE, &sdp->sd_flags))
1065                seq_puts(s, ",demote_interface_used");
1066        if (args->ar_rgrplvb)
1067                seq_puts(s, ",rgrplvb");
1068        if (args->ar_loccookie)
1069                seq_puts(s, ",loccookie");
1070        return 0;
1071}
1072
1073static void gfs2_final_release_pages(struct gfs2_inode *ip)
1074{
1075        struct inode *inode = &ip->i_inode;
1076        struct gfs2_glock *gl = ip->i_gl;
1077
1078        truncate_inode_pages(gfs2_glock2aspace(ip->i_gl), 0);
1079        truncate_inode_pages(&inode->i_data, 0);
1080
1081        if (atomic_read(&gl->gl_revokes) == 0) {
1082                clear_bit(GLF_LFLUSH, &gl->gl_flags);
1083                clear_bit(GLF_DIRTY, &gl->gl_flags);
1084        }
1085}
1086
1087static int gfs2_dinode_dealloc(struct gfs2_inode *ip)
1088{
1089        struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1090        struct gfs2_rgrpd *rgd;
1091        struct gfs2_holder gh;
1092        int error;
1093
1094        if (gfs2_get_inode_blocks(&ip->i_inode) != 1) {
1095                gfs2_consist_inode(ip);
1096                return -EIO;
1097        }
1098
1099        error = gfs2_rindex_update(sdp);
1100        if (error)
1101                return error;
1102
1103        error = gfs2_quota_hold(ip, NO_UID_QUOTA_CHANGE, NO_GID_QUOTA_CHANGE);
1104        if (error)
1105                return error;
1106
1107        rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1);
1108        if (!rgd) {
1109                gfs2_consist_inode(ip);
1110                error = -EIO;
1111                goto out_qs;
1112        }
1113
1114        error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE,
1115                                   LM_FLAG_NODE_SCOPE, &gh);
1116        if (error)
1117                goto out_qs;
1118
1119        error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS + RES_QUOTA,
1120                                 sdp->sd_jdesc->jd_blocks);
1121        if (error)
1122                goto out_rg_gunlock;
1123
1124        gfs2_free_di(rgd, ip);
1125
1126        gfs2_final_release_pages(ip);
1127
1128        gfs2_trans_end(sdp);
1129
1130out_rg_gunlock:
1131        gfs2_glock_dq_uninit(&gh);
1132out_qs:
1133        gfs2_quota_unhold(ip);
1134        return error;
1135}
1136
1137/**
1138 * gfs2_glock_put_eventually
1139 * @gl: The glock to put
1140 *
1141 * When under memory pressure, trigger a deferred glock put to make sure we
1142 * won't call into DLM and deadlock.  Otherwise, put the glock directly.
1143 */
1144
1145static void gfs2_glock_put_eventually(struct gfs2_glock *gl)
1146{
1147        if (current->flags & PF_MEMALLOC)
1148                gfs2_glock_queue_put(gl);
1149        else
1150                gfs2_glock_put(gl);
1151}
1152
1153static bool gfs2_upgrade_iopen_glock(struct inode *inode)
1154{
1155        struct gfs2_inode *ip = GFS2_I(inode);
1156        struct gfs2_sbd *sdp = GFS2_SB(inode);
1157        struct gfs2_holder *gh = &ip->i_iopen_gh;
1158        long timeout = 5 * HZ;
1159        int error;
1160
1161        gh->gh_flags |= GL_NOCACHE;
1162        gfs2_glock_dq_wait(gh);
1163
1164        /*
1165         * If there are no other lock holders, we'll get the lock immediately.
1166         * Otherwise, the other nodes holding the lock will be notified about
1167         * our locking request.  If they don't have the inode open, they'll
1168         * evict the cached inode and release the lock.  Otherwise, if they
1169         * poke the inode glock, we'll take this as an indication that they
1170         * still need the iopen glock and that they'll take care of deleting
1171         * the inode when they're done.  As a last resort, if another node
1172         * keeps holding the iopen glock without showing any activity on the
1173         * inode glock, we'll eventually time out.
1174         *
1175         * Note that we're passing the LM_FLAG_TRY_1CB flag to the first
1176         * locking request as an optimization to notify lock holders as soon as
1177         * possible.  Without that flag, they'd be notified implicitly by the
1178         * second locking request.
1179         */
1180
1181        gfs2_holder_reinit(LM_ST_EXCLUSIVE, LM_FLAG_TRY_1CB | GL_NOCACHE, gh);
1182        error = gfs2_glock_nq(gh);
1183        if (error != GLR_TRYFAILED)
1184                return !error;
1185
1186        gfs2_holder_reinit(LM_ST_EXCLUSIVE, GL_ASYNC | GL_NOCACHE, gh);
1187        error = gfs2_glock_nq(gh);
1188        if (error)
1189                return false;
1190
1191        timeout = wait_event_interruptible_timeout(sdp->sd_async_glock_wait,
1192                !test_bit(HIF_WAIT, &gh->gh_iflags) ||
1193                test_bit(GLF_DEMOTE, &ip->i_gl->gl_flags),
1194                timeout);
1195        if (!test_bit(HIF_HOLDER, &gh->gh_iflags)) {
1196                gfs2_glock_dq(gh);
1197                return false;
1198        }
1199        return true;
1200}
1201
1202/**
1203 * evict_should_delete - determine whether the inode is eligible for deletion
1204 * @inode: The inode to evict
1205 * @gh: The glock holder structure
1206 *
1207 * This function determines whether the evicted inode is eligible to be deleted
1208 * and locks the inode glock.
1209 *
1210 * Returns: the fate of the dinode
1211 */
1212static enum dinode_demise evict_should_delete(struct inode *inode,
1213                                              struct gfs2_holder *gh)
1214{
1215        struct gfs2_inode *ip = GFS2_I(inode);
1216        struct super_block *sb = inode->i_sb;
1217        struct gfs2_sbd *sdp = sb->s_fs_info;
1218        int ret;
1219
1220        if (test_bit(GIF_ALLOC_FAILED, &ip->i_flags)) {
1221                BUG_ON(!gfs2_glock_is_locked_by_me(ip->i_gl));
1222                goto should_delete;
1223        }
1224
1225        if (test_bit(GIF_DEFERRED_DELETE, &ip->i_flags))
1226                return SHOULD_DEFER_EVICTION;
1227
1228        /* Deletes should never happen under memory pressure anymore.  */
1229        if (WARN_ON_ONCE(current->flags & PF_MEMALLOC))
1230                return SHOULD_DEFER_EVICTION;
1231
1232        /* Must not read inode block until block type has been verified */
1233        ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, gh);
1234        if (unlikely(ret)) {
1235                glock_clear_object(ip->i_iopen_gh.gh_gl, ip);
1236                ip->i_iopen_gh.gh_flags |= GL_NOCACHE;
1237                gfs2_glock_dq_uninit(&ip->i_iopen_gh);
1238                return SHOULD_DEFER_EVICTION;
1239        }
1240
1241        if (gfs2_inode_already_deleted(ip->i_gl, ip->i_no_formal_ino))
1242                return SHOULD_NOT_DELETE_DINODE;
1243        ret = gfs2_check_blk_type(sdp, ip->i_no_addr, GFS2_BLKST_UNLINKED);
1244        if (ret)
1245                return SHOULD_NOT_DELETE_DINODE;
1246
1247        ret = gfs2_instantiate(gh);
1248        if (ret)
1249                return SHOULD_NOT_DELETE_DINODE;
1250
1251        /*
1252         * The inode may have been recreated in the meantime.
1253         */
1254        if (inode->i_nlink)
1255                return SHOULD_NOT_DELETE_DINODE;
1256
1257should_delete:
1258        if (gfs2_holder_initialized(&ip->i_iopen_gh) &&
1259            test_bit(HIF_HOLDER, &ip->i_iopen_gh.gh_iflags)) {
1260                if (!gfs2_upgrade_iopen_glock(inode)) {
1261                        gfs2_holder_uninit(&ip->i_iopen_gh);
1262                        return SHOULD_NOT_DELETE_DINODE;
1263                }
1264        }
1265        return SHOULD_DELETE_DINODE;
1266}
1267
1268/**
1269 * evict_unlinked_inode - delete the pieces of an unlinked evicted inode
1270 * @inode: The inode to evict
1271 */
1272static int evict_unlinked_inode(struct inode *inode)
1273{
1274        struct gfs2_inode *ip = GFS2_I(inode);
1275        int ret;
1276
1277        if (S_ISDIR(inode->i_mode) &&
1278            (ip->i_diskflags & GFS2_DIF_EXHASH)) {
1279                ret = gfs2_dir_exhash_dealloc(ip);
1280                if (ret)
1281                        goto out;
1282        }
1283
1284        if (ip->i_eattr) {
1285                ret = gfs2_ea_dealloc(ip);
1286                if (ret)
1287                        goto out;
1288        }
1289
1290        if (!gfs2_is_stuffed(ip)) {
1291                ret = gfs2_file_dealloc(ip);
1292                if (ret)
1293                        goto out;
1294        }
1295
1296        /* We're about to clear the bitmap for the dinode, but as soon as we
1297           do, gfs2_create_inode can create another inode at the same block
1298           location and try to set gl_object again. We clear gl_object here so
1299           that subsequent inode creates don't see an old gl_object. */
1300        glock_clear_object(ip->i_gl, ip);
1301        ret = gfs2_dinode_dealloc(ip);
1302        gfs2_inode_remember_delete(ip->i_gl, ip->i_no_formal_ino);
1303out:
1304        return ret;
1305}
1306
1307/*
1308 * evict_linked_inode - evict an inode whose dinode has not been unlinked
1309 * @inode: The inode to evict
1310 */
1311static int evict_linked_inode(struct inode *inode)
1312{
1313        struct super_block *sb = inode->i_sb;
1314        struct gfs2_sbd *sdp = sb->s_fs_info;
1315        struct gfs2_inode *ip = GFS2_I(inode);
1316        struct address_space *metamapping;
1317        int ret;
1318
1319        gfs2_log_flush(sdp, ip->i_gl, GFS2_LOG_HEAD_FLUSH_NORMAL |
1320                       GFS2_LFC_EVICT_INODE);
1321        metamapping = gfs2_glock2aspace(ip->i_gl);
1322        if (test_bit(GLF_DIRTY, &ip->i_gl->gl_flags)) {
1323                filemap_fdatawrite(metamapping);
1324                filemap_fdatawait(metamapping);
1325        }
1326        write_inode_now(inode, 1);
1327        gfs2_ail_flush(ip->i_gl, 0);
1328
1329        ret = gfs2_trans_begin(sdp, 0, sdp->sd_jdesc->jd_blocks);
1330        if (ret)
1331                return ret;
1332
1333        /* Needs to be done before glock release & also in a transaction */
1334        truncate_inode_pages(&inode->i_data, 0);
1335        truncate_inode_pages(metamapping, 0);
1336        gfs2_trans_end(sdp);
1337        return 0;
1338}
1339
1340/**
1341 * gfs2_evict_inode - Remove an inode from cache
1342 * @inode: The inode to evict
1343 *
1344 * There are three cases to consider:
1345 * 1. i_nlink == 0, we are final opener (and must deallocate)
1346 * 2. i_nlink == 0, we are not the final opener (and cannot deallocate)
1347 * 3. i_nlink > 0
1348 *
1349 * If the fs is read only, then we have to treat all cases as per #3
1350 * since we are unable to do any deallocation. The inode will be
1351 * deallocated by the next read/write node to attempt an allocation
1352 * in the same resource group
1353 *
1354 * We have to (at the moment) hold the inodes main lock to cover
1355 * the gap between unlocking the shared lock on the iopen lock and
1356 * taking the exclusive lock. I'd rather do a shared -> exclusive
1357 * conversion on the iopen lock, but we can change that later. This
1358 * is safe, just less efficient.
1359 */
1360
1361static void gfs2_evict_inode(struct inode *inode)
1362{
1363        struct super_block *sb = inode->i_sb;
1364        struct gfs2_sbd *sdp = sb->s_fs_info;
1365        struct gfs2_inode *ip = GFS2_I(inode);
1366        struct gfs2_holder gh;
1367        int ret;
1368
1369        if (test_bit(GIF_FREE_VFS_INODE, &ip->i_flags)) {
1370                clear_inode(inode);
1371                return;
1372        }
1373
1374        if (inode->i_nlink || sb_rdonly(sb))
1375                goto out;
1376
1377        gfs2_holder_mark_uninitialized(&gh);
1378        ret = evict_should_delete(inode, &gh);
1379        if (ret == SHOULD_DEFER_EVICTION)
1380                goto out;
1381        if (ret == SHOULD_DELETE_DINODE)
1382                ret = evict_unlinked_inode(inode);
1383        else
1384                ret = evict_linked_inode(inode);
1385
1386        if (gfs2_rs_active(&ip->i_res))
1387                gfs2_rs_deltree(&ip->i_res);
1388
1389        if (gfs2_holder_initialized(&gh)) {
1390                glock_clear_object(ip->i_gl, ip);
1391                gfs2_glock_dq_uninit(&gh);
1392        }
1393        if (ret && ret != GLR_TRYFAILED && ret != -EROFS)
1394                fs_warn(sdp, "gfs2_evict_inode: %d\n", ret);
1395out:
1396        truncate_inode_pages_final(&inode->i_data);
1397        if (ip->i_qadata)
1398                gfs2_assert_warn(sdp, ip->i_qadata->qa_ref == 0);
1399        gfs2_rs_deltree(&ip->i_res);
1400        gfs2_ordered_del_inode(ip);
1401        clear_inode(inode);
1402        gfs2_dir_hash_inval(ip);
1403        if (gfs2_holder_initialized(&ip->i_iopen_gh)) {
1404                struct gfs2_glock *gl = ip->i_iopen_gh.gh_gl;
1405
1406                glock_clear_object(gl, ip);
1407                if (test_bit(HIF_HOLDER, &ip->i_iopen_gh.gh_iflags)) {
1408                        ip->i_iopen_gh.gh_flags |= GL_NOCACHE;
1409                        gfs2_glock_dq(&ip->i_iopen_gh);
1410                }
1411                gfs2_glock_hold(gl);
1412                gfs2_holder_uninit(&ip->i_iopen_gh);
1413                gfs2_glock_put_eventually(gl);
1414        }
1415        if (ip->i_gl) {
1416                glock_clear_object(ip->i_gl, ip);
1417                wait_on_bit_io(&ip->i_flags, GIF_GLOP_PENDING, TASK_UNINTERRUPTIBLE);
1418                gfs2_glock_add_to_lru(ip->i_gl);
1419                gfs2_glock_put_eventually(ip->i_gl);
1420                ip->i_gl = NULL;
1421        }
1422}
1423
1424static struct inode *gfs2_alloc_inode(struct super_block *sb)
1425{
1426        struct gfs2_inode *ip;
1427
1428        ip = alloc_inode_sb(sb, gfs2_inode_cachep, GFP_KERNEL);
1429        if (!ip)
1430                return NULL;
1431        ip->i_flags = 0;
1432        ip->i_gl = NULL;
1433        gfs2_holder_mark_uninitialized(&ip->i_iopen_gh);
1434        memset(&ip->i_res, 0, sizeof(ip->i_res));
1435        RB_CLEAR_NODE(&ip->i_res.rs_node);
1436        ip->i_rahead = 0;
1437        return &ip->i_inode;
1438}
1439
1440static void gfs2_free_inode(struct inode *inode)
1441{
1442        kmem_cache_free(gfs2_inode_cachep, GFS2_I(inode));
1443}
1444
1445extern void free_local_statfs_inodes(struct gfs2_sbd *sdp)
1446{
1447        struct local_statfs_inode *lsi, *safe;
1448
1449        /* Run through the statfs inodes list to iput and free memory */
1450        list_for_each_entry_safe(lsi, safe, &sdp->sd_sc_inodes_list, si_list) {
1451                if (lsi->si_jid == sdp->sd_jdesc->jd_jid)
1452                        sdp->sd_sc_inode = NULL; /* belongs to this node */
1453                if (lsi->si_sc_inode)
1454                        iput(lsi->si_sc_inode);
1455                list_del(&lsi->si_list);
1456                kfree(lsi);
1457        }
1458}
1459
1460extern struct inode *find_local_statfs_inode(struct gfs2_sbd *sdp,
1461                                             unsigned int index)
1462{
1463        struct local_statfs_inode *lsi;
1464
1465        /* Return the local (per node) statfs inode in the
1466         * sdp->sd_sc_inodes_list corresponding to the 'index'. */
1467        list_for_each_entry(lsi, &sdp->sd_sc_inodes_list, si_list) {
1468                if (lsi->si_jid == index)
1469                        return lsi->si_sc_inode;
1470        }
1471        return NULL;
1472}
1473
1474const struct super_operations gfs2_super_ops = {
1475        .alloc_inode            = gfs2_alloc_inode,
1476        .free_inode             = gfs2_free_inode,
1477        .write_inode            = gfs2_write_inode,
1478        .dirty_inode            = gfs2_dirty_inode,
1479        .evict_inode            = gfs2_evict_inode,
1480        .put_super              = gfs2_put_super,
1481        .sync_fs                = gfs2_sync_fs,
1482        .freeze_super           = gfs2_freeze,
1483        .thaw_super             = gfs2_unfreeze,
1484        .statfs                 = gfs2_statfs,
1485        .drop_inode             = gfs2_drop_inode,
1486        .show_options           = gfs2_show_options,
1487};
1488
1489