fs/gfs2/super.c

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This source file includes following definitions.
gfs2_jindex_free
jdesc_find_i
gfs2_jdesc_find
gfs2_jdesc_check
init_threads
gfs2_make_fs_rw
gfs2_statfs_change_in
gfs2_statfs_change_out
gfs2_statfs_init
gfs2_statfs_change
update_statfs
gfs2_statfs_sync
gfs2_lock_fs_check_clean
gfs2_dinode_out
gfs2_write_inode
gfs2_dirty_inode
gfs2_make_fs_ro
gfs2_put_super
gfs2_sync_fs
gfs2_freeze_func
gfs2_freeze
gfs2_unfreeze
statfs_slow_fill
gfs2_statfs_slow
gfs2_statfs_i
gfs2_statfs
gfs2_drop_inode
is_ancestor
gfs2_show_options
gfs2_final_release_pages
gfs2_dinode_dealloc
gfs2_glock_put_eventually
gfs2_evict_inode
gfs2_alloc_inode
gfs2_free_inode
   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
   4  * Copyright (C) 2004-2007 Red Hat, Inc.  All rights reserved.
   5  */
   6 
   7 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
   8 
   9 #include <linux/bio.h>
  10 #include <linux/sched/signal.h>
  11 #include <linux/slab.h>
  12 #include <linux/spinlock.h>
  13 #include <linux/completion.h>
  14 #include <linux/buffer_head.h>
  15 #include <linux/statfs.h>
  16 #include <linux/seq_file.h>
  17 #include <linux/mount.h>
  18 #include <linux/kthread.h>
  19 #include <linux/delay.h>
  20 #include <linux/gfs2_ondisk.h>
  21 #include <linux/crc32.h>
  22 #include <linux/time.h>
  23 #include <linux/wait.h>
  24 #include <linux/writeback.h>
  25 #include <linux/backing-dev.h>
  26 #include <linux/kernel.h>
  27 
  28 #include "gfs2.h"
  29 #include "incore.h"
  30 #include "bmap.h"
  31 #include "dir.h"
  32 #include "glock.h"
  33 #include "glops.h"
  34 #include "inode.h"
  35 #include "log.h"
  36 #include "meta_io.h"
  37 #include "quota.h"
  38 #include "recovery.h"
  39 #include "rgrp.h"
  40 #include "super.h"
  41 #include "trans.h"
  42 #include "util.h"
  43 #include "sys.h"
  44 #include "xattr.h"
  45 #include "lops.h"
  46 
  47 /**
  48  * gfs2_jindex_free - Clear all the journal index information
  49  * @sdp: The GFS2 superblock
  50  *
  51  */
  52 
  53 void gfs2_jindex_free(struct gfs2_sbd *sdp)
  54 {
  55         struct list_head list;
  56         struct gfs2_jdesc *jd;
  57 
  58         spin_lock(&sdp->sd_jindex_spin);
  59         list_add(&list, &sdp->sd_jindex_list);
  60         list_del_init(&sdp->sd_jindex_list);
  61         sdp->sd_journals = 0;
  62         spin_unlock(&sdp->sd_jindex_spin);
  63 
  64         while (!list_empty(&list)) {
  65                 jd = list_entry(list.next, struct gfs2_jdesc, jd_list);
  66                 gfs2_free_journal_extents(jd);
  67                 list_del(&jd->jd_list);
  68                 iput(jd->jd_inode);
  69                 kfree(jd);
  70         }
  71 }
  72 
  73 static struct gfs2_jdesc *jdesc_find_i(struct list_head *head, unsigned int jid)
  74 {
  75         struct gfs2_jdesc *jd;
  76         int found = 0;
  77 
  78         list_for_each_entry(jd, head, jd_list) {
  79                 if (jd->jd_jid == jid) {
  80                         found = 1;
  81                         break;
  82                 }
  83         }
  84 
  85         if (!found)
  86                 jd = NULL;
  87 
  88         return jd;
  89 }
  90 
  91 struct gfs2_jdesc *gfs2_jdesc_find(struct gfs2_sbd *sdp, unsigned int jid)
  92 {
  93         struct gfs2_jdesc *jd;
  94 
  95         spin_lock(&sdp->sd_jindex_spin);
  96         jd = jdesc_find_i(&sdp->sd_jindex_list, jid);
  97         spin_unlock(&sdp->sd_jindex_spin);
  98 
  99         return jd;
 100 }
 101 
 102 int gfs2_jdesc_check(struct gfs2_jdesc *jd)
 103 {
 104         struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
 105         struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
 106         u64 size = i_size_read(jd->jd_inode);
 107 
 108         if (gfs2_check_internal_file_size(jd->jd_inode, 8 << 20, BIT(30)))
 109                 return -EIO;
 110 
 111         jd->jd_blocks = size >> sdp->sd_sb.sb_bsize_shift;
 112 
 113         if (gfs2_write_alloc_required(ip, 0, size)) {
 114                 gfs2_consist_inode(ip);
 115                 return -EIO;
 116         }
 117 
 118         return 0;
 119 }
 120 
 121 static int init_threads(struct gfs2_sbd *sdp)
 122 {
 123         struct task_struct *p;
 124         int error = 0;
 125 
 126         p = kthread_run(gfs2_logd, sdp, "gfs2_logd");
 127         if (IS_ERR(p)) {
 128                 error = PTR_ERR(p);
 129                 fs_err(sdp, "can't start logd thread: %d\n", error);
 130                 return error;
 131         }
 132         sdp->sd_logd_process = p;
 133 
 134         p = kthread_run(gfs2_quotad, sdp, "gfs2_quotad");
 135         if (IS_ERR(p)) {
 136                 error = PTR_ERR(p);
 137                 fs_err(sdp, "can't start quotad thread: %d\n", error);
 138                 goto fail;
 139         }
 140         sdp->sd_quotad_process = p;
 141         return 0;
 142 
 143 fail:
 144         kthread_stop(sdp->sd_logd_process);
 145         sdp->sd_logd_process = NULL;
 146         return error;
 147 }
 148 
 149 /**
 150  * gfs2_make_fs_rw - Turn a Read-Only FS into a Read-Write one
 151  * @sdp: the filesystem
 152  *
 153  * Returns: errno
 154  */
 155 
 156 int gfs2_make_fs_rw(struct gfs2_sbd *sdp)
 157 {
 158         struct gfs2_inode *ip = GFS2_I(sdp->sd_jdesc->jd_inode);
 159         struct gfs2_glock *j_gl = ip->i_gl;
 160         struct gfs2_holder freeze_gh;
 161         struct gfs2_log_header_host head;
 162         int error;
 163 
 164         error = init_threads(sdp);
 165         if (error)
 166                 return error;
 167 
 168         error = gfs2_glock_nq_init(sdp->sd_freeze_gl, LM_ST_SHARED, 0,
 169                                    &freeze_gh);
 170         if (error)
 171                 goto fail_threads;
 172 
 173         j_gl->gl_ops->go_inval(j_gl, DIO_METADATA);
 174 
 175         error = gfs2_find_jhead(sdp->sd_jdesc, &head, false);
 176         if (error)
 177                 goto fail;
 178 
 179         if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) {
 180                 gfs2_consist(sdp);
 181                 error = -EIO;
 182                 goto fail;
 183         }
 184 
 185         /*  Initialize some head of the log stuff  */
 186         sdp->sd_log_sequence = head.lh_sequence + 1;
 187         gfs2_log_pointers_init(sdp, head.lh_blkno);
 188 
 189         error = gfs2_quota_init(sdp);
 190         if (error)
 191                 goto fail;
 192 
 193         set_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags);
 194 
 195         gfs2_glock_dq_uninit(&freeze_gh);
 196 
 197         return 0;
 198 
 199 fail:
 200         freeze_gh.gh_flags |= GL_NOCACHE;
 201         gfs2_glock_dq_uninit(&freeze_gh);
 202 fail_threads:
 203         if (sdp->sd_quotad_process)
 204                 kthread_stop(sdp->sd_quotad_process);
 205         sdp->sd_quotad_process = NULL;
 206         if (sdp->sd_logd_process)
 207                 kthread_stop(sdp->sd_logd_process);
 208         sdp->sd_logd_process = NULL;
 209         return error;
 210 }
 211 
 212 void gfs2_statfs_change_in(struct gfs2_statfs_change_host *sc, const void *buf)
 213 {
 214         const struct gfs2_statfs_change *str = buf;
 215 
 216         sc->sc_total = be64_to_cpu(str->sc_total);
 217         sc->sc_free = be64_to_cpu(str->sc_free);
 218         sc->sc_dinodes = be64_to_cpu(str->sc_dinodes);
 219 }
 220 
 221 static void gfs2_statfs_change_out(const struct gfs2_statfs_change_host *sc, void *buf)
 222 {
 223         struct gfs2_statfs_change *str = buf;
 224 
 225         str->sc_total = cpu_to_be64(sc->sc_total);
 226         str->sc_free = cpu_to_be64(sc->sc_free);
 227         str->sc_dinodes = cpu_to_be64(sc->sc_dinodes);
 228 }
 229 
 230 int gfs2_statfs_init(struct gfs2_sbd *sdp)
 231 {
 232         struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
 233         struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
 234         struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
 235         struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
 236         struct buffer_head *m_bh, *l_bh;
 237         struct gfs2_holder gh;
 238         int error;
 239 
 240         error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE,
 241                                    &gh);
 242         if (error)
 243                 return error;
 244 
 245         error = gfs2_meta_inode_buffer(m_ip, &m_bh);
 246         if (error)
 247                 goto out;
 248 
 249         if (sdp->sd_args.ar_spectator) {
 250                 spin_lock(&sdp->sd_statfs_spin);
 251                 gfs2_statfs_change_in(m_sc, m_bh->b_data +
 252                                       sizeof(struct gfs2_dinode));
 253                 spin_unlock(&sdp->sd_statfs_spin);
 254         } else {
 255                 error = gfs2_meta_inode_buffer(l_ip, &l_bh);
 256                 if (error)
 257                         goto out_m_bh;
 258 
 259                 spin_lock(&sdp->sd_statfs_spin);
 260                 gfs2_statfs_change_in(m_sc, m_bh->b_data +
 261                                       sizeof(struct gfs2_dinode));
 262                 gfs2_statfs_change_in(l_sc, l_bh->b_data +
 263                                       sizeof(struct gfs2_dinode));
 264                 spin_unlock(&sdp->sd_statfs_spin);
 265 
 266                 brelse(l_bh);
 267         }
 268 
 269 out_m_bh:
 270         brelse(m_bh);
 271 out:
 272         gfs2_glock_dq_uninit(&gh);
 273         return 0;
 274 }
 275 
 276 void gfs2_statfs_change(struct gfs2_sbd *sdp, s64 total, s64 free,
 277                         s64 dinodes)
 278 {
 279         struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
 280         struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
 281         struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
 282         struct buffer_head *l_bh;
 283         s64 x, y;
 284         int need_sync = 0;
 285         int error;
 286 
 287         error = gfs2_meta_inode_buffer(l_ip, &l_bh);
 288         if (error)
 289                 return;
 290 
 291         gfs2_trans_add_meta(l_ip->i_gl, l_bh);
 292 
 293         spin_lock(&sdp->sd_statfs_spin);
 294         l_sc->sc_total += total;
 295         l_sc->sc_free += free;
 296         l_sc->sc_dinodes += dinodes;
 297         gfs2_statfs_change_out(l_sc, l_bh->b_data + sizeof(struct gfs2_dinode));
 298         if (sdp->sd_args.ar_statfs_percent) {
 299                 x = 100 * l_sc->sc_free;
 300                 y = m_sc->sc_free * sdp->sd_args.ar_statfs_percent;
 301                 if (x >= y || x <= -y)
 302                         need_sync = 1;
 303         }
 304         spin_unlock(&sdp->sd_statfs_spin);
 305 
 306         brelse(l_bh);
 307         if (need_sync)
 308                 gfs2_wake_up_statfs(sdp);
 309 }
 310 
 311 void update_statfs(struct gfs2_sbd *sdp, struct buffer_head *m_bh,
 312                    struct buffer_head *l_bh)
 313 {
 314         struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
 315         struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
 316         struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
 317         struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
 318 
 319         gfs2_trans_add_meta(l_ip->i_gl, l_bh);
 320         gfs2_trans_add_meta(m_ip->i_gl, m_bh);
 321 
 322         spin_lock(&sdp->sd_statfs_spin);
 323         m_sc->sc_total += l_sc->sc_total;
 324         m_sc->sc_free += l_sc->sc_free;
 325         m_sc->sc_dinodes += l_sc->sc_dinodes;
 326         memset(l_sc, 0, sizeof(struct gfs2_statfs_change));
 327         memset(l_bh->b_data + sizeof(struct gfs2_dinode),
 328                0, sizeof(struct gfs2_statfs_change));
 329         gfs2_statfs_change_out(m_sc, m_bh->b_data + sizeof(struct gfs2_dinode));
 330         spin_unlock(&sdp->sd_statfs_spin);
 331 }
 332 
 333 int gfs2_statfs_sync(struct super_block *sb, int type)
 334 {
 335         struct gfs2_sbd *sdp = sb->s_fs_info;
 336         struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
 337         struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
 338         struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
 339         struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
 340         struct gfs2_holder gh;
 341         struct buffer_head *m_bh, *l_bh;
 342         int error;
 343 
 344         sb_start_write(sb);
 345         error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE,
 346                                    &gh);
 347         if (error)
 348                 goto out;
 349 
 350         error = gfs2_meta_inode_buffer(m_ip, &m_bh);
 351         if (error)
 352                 goto out_unlock;
 353 
 354         spin_lock(&sdp->sd_statfs_spin);
 355         gfs2_statfs_change_in(m_sc, m_bh->b_data +
 356                               sizeof(struct gfs2_dinode));
 357         if (!l_sc->sc_total && !l_sc->sc_free && !l_sc->sc_dinodes) {
 358                 spin_unlock(&sdp->sd_statfs_spin);
 359                 goto out_bh;
 360         }
 361         spin_unlock(&sdp->sd_statfs_spin);
 362 
 363         error = gfs2_meta_inode_buffer(l_ip, &l_bh);
 364         if (error)
 365                 goto out_bh;
 366 
 367         error = gfs2_trans_begin(sdp, 2 * RES_DINODE, 0);
 368         if (error)
 369                 goto out_bh2;
 370 
 371         update_statfs(sdp, m_bh, l_bh);
 372         sdp->sd_statfs_force_sync = 0;
 373 
 374         gfs2_trans_end(sdp);
 375 
 376 out_bh2:
 377         brelse(l_bh);
 378 out_bh:
 379         brelse(m_bh);
 380 out_unlock:
 381         gfs2_glock_dq_uninit(&gh);
 382 out:
 383         sb_end_write(sb);
 384         return error;
 385 }
 386 
 387 struct lfcc {
 388         struct list_head list;
 389         struct gfs2_holder gh;
 390 };
 391 
 392 /**
 393  * gfs2_lock_fs_check_clean - Stop all writes to the FS and check that all
 394  *                            journals are clean
 395  * @sdp: the file system
 396  * @state: the state to put the transaction lock into
 397  * @t_gh: the hold on the transaction lock
 398  *
 399  * Returns: errno
 400  */
 401 
 402 static int gfs2_lock_fs_check_clean(struct gfs2_sbd *sdp,
 403                                     struct gfs2_holder *freeze_gh)
 404 {
 405         struct gfs2_inode *ip;
 406         struct gfs2_jdesc *jd;
 407         struct lfcc *lfcc;
 408         LIST_HEAD(list);
 409         struct gfs2_log_header_host lh;
 410         int error;
 411 
 412         list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
 413                 lfcc = kmalloc(sizeof(struct lfcc), GFP_KERNEL);
 414                 if (!lfcc) {
 415                         error = -ENOMEM;
 416                         goto out;
 417                 }
 418                 ip = GFS2_I(jd->jd_inode);
 419                 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &lfcc->gh);
 420                 if (error) {
 421                         kfree(lfcc);
 422                         goto out;
 423                 }
 424                 list_add(&lfcc->list, &list);
 425         }
 426 
 427         error = gfs2_glock_nq_init(sdp->sd_freeze_gl, LM_ST_EXCLUSIVE,
 428                                    GL_NOCACHE, freeze_gh);
 429 
 430         list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
 431                 error = gfs2_jdesc_check(jd);
 432                 if (error)
 433                         break;
 434                 error = gfs2_find_jhead(jd, &lh, false);
 435                 if (error)
 436                         break;
 437                 if (!(lh.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) {
 438                         error = -EBUSY;
 439                         break;
 440                 }
 441         }
 442 
 443         if (error)
 444                 gfs2_glock_dq_uninit(freeze_gh);
 445 
 446 out:
 447         while (!list_empty(&list)) {
 448                 lfcc = list_entry(list.next, struct lfcc, list);
 449                 list_del(&lfcc->list);
 450                 gfs2_glock_dq_uninit(&lfcc->gh);
 451                 kfree(lfcc);
 452         }
 453         return error;
 454 }
 455 
 456 void gfs2_dinode_out(const struct gfs2_inode *ip, void *buf)
 457 {
 458         struct gfs2_dinode *str = buf;
 459 
 460         str->di_header.mh_magic = cpu_to_be32(GFS2_MAGIC);
 461         str->di_header.mh_type = cpu_to_be32(GFS2_METATYPE_DI);
 462         str->di_header.mh_format = cpu_to_be32(GFS2_FORMAT_DI);
 463         str->di_num.no_addr = cpu_to_be64(ip->i_no_addr);
 464         str->di_num.no_formal_ino = cpu_to_be64(ip->i_no_formal_ino);
 465         str->di_mode = cpu_to_be32(ip->i_inode.i_mode);
 466         str->di_uid = cpu_to_be32(i_uid_read(&ip->i_inode));
 467         str->di_gid = cpu_to_be32(i_gid_read(&ip->i_inode));
 468         str->di_nlink = cpu_to_be32(ip->i_inode.i_nlink);
 469         str->di_size = cpu_to_be64(i_size_read(&ip->i_inode));
 470         str->di_blocks = cpu_to_be64(gfs2_get_inode_blocks(&ip->i_inode));
 471         str->di_atime = cpu_to_be64(ip->i_inode.i_atime.tv_sec);
 472         str->di_mtime = cpu_to_be64(ip->i_inode.i_mtime.tv_sec);
 473         str->di_ctime = cpu_to_be64(ip->i_inode.i_ctime.tv_sec);
 474 
 475         str->di_goal_meta = cpu_to_be64(ip->i_goal);
 476         str->di_goal_data = cpu_to_be64(ip->i_goal);
 477         str->di_generation = cpu_to_be64(ip->i_generation);
 478 
 479         str->di_flags = cpu_to_be32(ip->i_diskflags);
 480         str->di_height = cpu_to_be16(ip->i_height);
 481         str->di_payload_format = cpu_to_be32(S_ISDIR(ip->i_inode.i_mode) &&
 482                                              !(ip->i_diskflags & GFS2_DIF_EXHASH) ?
 483                                              GFS2_FORMAT_DE : 0);
 484         str->di_depth = cpu_to_be16(ip->i_depth);
 485         str->di_entries = cpu_to_be32(ip->i_entries);
 486 
 487         str->di_eattr = cpu_to_be64(ip->i_eattr);
 488         str->di_atime_nsec = cpu_to_be32(ip->i_inode.i_atime.tv_nsec);
 489         str->di_mtime_nsec = cpu_to_be32(ip->i_inode.i_mtime.tv_nsec);
 490         str->di_ctime_nsec = cpu_to_be32(ip->i_inode.i_ctime.tv_nsec);
 491 }
 492 
 493 /**
 494  * gfs2_write_inode - Make sure the inode is stable on the disk
 495  * @inode: The inode
 496  * @wbc: The writeback control structure
 497  *
 498  * Returns: errno
 499  */
 500 
 501 static int gfs2_write_inode(struct inode *inode, struct writeback_control *wbc)
 502 {
 503         struct gfs2_inode *ip = GFS2_I(inode);
 504         struct gfs2_sbd *sdp = GFS2_SB(inode);
 505         struct address_space *metamapping = gfs2_glock2aspace(ip->i_gl);
 506         struct backing_dev_info *bdi = inode_to_bdi(metamapping->host);
 507         int ret = 0;
 508         bool flush_all = (wbc->sync_mode == WB_SYNC_ALL || gfs2_is_jdata(ip));
 509 
 510         if (flush_all)
 511                 gfs2_log_flush(GFS2_SB(inode), ip->i_gl,
 512                                GFS2_LOG_HEAD_FLUSH_NORMAL |
 513                                GFS2_LFC_WRITE_INODE);
 514         if (bdi->wb.dirty_exceeded)
 515                 gfs2_ail1_flush(sdp, wbc);
 516         else
 517                 filemap_fdatawrite(metamapping);
 518         if (flush_all)
 519                 ret = filemap_fdatawait(metamapping);
 520         if (ret)
 521                 mark_inode_dirty_sync(inode);
 522         else {
 523                 spin_lock(&inode->i_lock);
 524                 if (!(inode->i_flags & I_DIRTY))
 525                         gfs2_ordered_del_inode(ip);
 526                 spin_unlock(&inode->i_lock);
 527         }
 528         return ret;
 529 }
 530 
 531 /**
 532  * gfs2_dirty_inode - check for atime updates
 533  * @inode: The inode in question
 534  * @flags: The type of dirty
 535  *
 536  * Unfortunately it can be called under any combination of inode
 537  * glock and transaction lock, so we have to check carefully.
 538  *
 539  * At the moment this deals only with atime - it should be possible
 540  * to expand that role in future, once a review of the locking has
 541  * been carried out.
 542  */
 543 
 544 static void gfs2_dirty_inode(struct inode *inode, int flags)
 545 {
 546         struct gfs2_inode *ip = GFS2_I(inode);
 547         struct gfs2_sbd *sdp = GFS2_SB(inode);
 548         struct buffer_head *bh;
 549         struct gfs2_holder gh;
 550         int need_unlock = 0;
 551         int need_endtrans = 0;
 552         int ret;
 553 
 554         if (!(flags & I_DIRTY_INODE))
 555                 return;
 556         if (unlikely(test_bit(SDF_WITHDRAWN, &sdp->sd_flags)))
 557                 return;
 558         if (!gfs2_glock_is_locked_by_me(ip->i_gl)) {
 559                 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
 560                 if (ret) {
 561                         fs_err(sdp, "dirty_inode: glock %d\n", ret);
 562                         return;
 563                 }
 564                 need_unlock = 1;
 565         } else if (WARN_ON_ONCE(ip->i_gl->gl_state != LM_ST_EXCLUSIVE))
 566                 return;
 567 
 568         if (current->journal_info == NULL) {
 569                 ret = gfs2_trans_begin(sdp, RES_DINODE, 0);
 570                 if (ret) {
 571                         fs_err(sdp, "dirty_inode: gfs2_trans_begin %d\n", ret);
 572                         goto out;
 573                 }
 574                 need_endtrans = 1;
 575         }
 576 
 577         ret = gfs2_meta_inode_buffer(ip, &bh);
 578         if (ret == 0) {
 579                 gfs2_trans_add_meta(ip->i_gl, bh);
 580                 gfs2_dinode_out(ip, bh->b_data);
 581                 brelse(bh);
 582         }
 583 
 584         if (need_endtrans)
 585                 gfs2_trans_end(sdp);
 586 out:
 587         if (need_unlock)
 588                 gfs2_glock_dq_uninit(&gh);
 589 }
 590 
 591 /**
 592  * gfs2_make_fs_ro - Turn a Read-Write FS into a Read-Only one
 593  * @sdp: the filesystem
 594  *
 595  * Returns: errno
 596  */
 597 
 598 int gfs2_make_fs_ro(struct gfs2_sbd *sdp)
 599 {
 600         struct gfs2_holder freeze_gh;
 601         int error;
 602 
 603         error = gfs2_glock_nq_init(sdp->sd_freeze_gl, LM_ST_SHARED, GL_NOCACHE,
 604                                    &freeze_gh);
 605         if (error && !test_bit(SDF_WITHDRAWN, &sdp->sd_flags))
 606                 return error;
 607 
 608         flush_workqueue(gfs2_delete_workqueue);
 609         if (sdp->sd_quotad_process)
 610                 kthread_stop(sdp->sd_quotad_process);
 611         sdp->sd_quotad_process = NULL;
 612         if (sdp->sd_logd_process)
 613                 kthread_stop(sdp->sd_logd_process);
 614         sdp->sd_logd_process = NULL;
 615 
 616         gfs2_quota_sync(sdp->sd_vfs, 0);
 617         gfs2_statfs_sync(sdp->sd_vfs, 0);
 618 
 619         gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_SHUTDOWN |
 620                        GFS2_LFC_MAKE_FS_RO);
 621         wait_event(sdp->sd_reserving_log_wait, atomic_read(&sdp->sd_reserving_log) == 0);
 622         gfs2_assert_warn(sdp, atomic_read(&sdp->sd_log_blks_free) == sdp->sd_jdesc->jd_blocks);
 623 
 624         if (gfs2_holder_initialized(&freeze_gh))
 625                 gfs2_glock_dq_uninit(&freeze_gh);
 626 
 627         gfs2_quota_cleanup(sdp);
 628 
 629         return error;
 630 }
 631 
 632 /**
 633  * gfs2_put_super - Unmount the filesystem
 634  * @sb: The VFS superblock
 635  *
 636  */
 637 
 638 static void gfs2_put_super(struct super_block *sb)
 639 {
 640         struct gfs2_sbd *sdp = sb->s_fs_info;
 641         int error;
 642         struct gfs2_jdesc *jd;
 643 
 644         /* No more recovery requests */
 645         set_bit(SDF_NORECOVERY, &sdp->sd_flags);
 646         smp_mb();
 647 
 648         /* Wait on outstanding recovery */
 649 restart:
 650         spin_lock(&sdp->sd_jindex_spin);
 651         list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
 652                 if (!test_bit(JDF_RECOVERY, &jd->jd_flags))
 653                         continue;
 654                 spin_unlock(&sdp->sd_jindex_spin);
 655                 wait_on_bit(&jd->jd_flags, JDF_RECOVERY,
 656                             TASK_UNINTERRUPTIBLE);
 657                 goto restart;
 658         }
 659         spin_unlock(&sdp->sd_jindex_spin);
 660 
 661         if (!sb_rdonly(sb)) {
 662                 error = gfs2_make_fs_ro(sdp);
 663                 if (error)
 664                         gfs2_io_error(sdp);
 665         }
 666         /*  At this point, we're through modifying the disk  */
 667 
 668         /*  Release stuff  */
 669 
 670         iput(sdp->sd_jindex);
 671         iput(sdp->sd_statfs_inode);
 672         iput(sdp->sd_rindex);
 673         iput(sdp->sd_quota_inode);
 674 
 675         gfs2_glock_put(sdp->sd_rename_gl);
 676         gfs2_glock_put(sdp->sd_freeze_gl);
 677 
 678         if (!sdp->sd_args.ar_spectator) {
 679                 gfs2_glock_dq_uninit(&sdp->sd_journal_gh);
 680                 gfs2_glock_dq_uninit(&sdp->sd_jinode_gh);
 681                 gfs2_glock_dq_uninit(&sdp->sd_sc_gh);
 682                 gfs2_glock_dq_uninit(&sdp->sd_qc_gh);
 683                 iput(sdp->sd_sc_inode);
 684                 iput(sdp->sd_qc_inode);
 685         }
 686 
 687         gfs2_glock_dq_uninit(&sdp->sd_live_gh);
 688         gfs2_clear_rgrpd(sdp);
 689         gfs2_jindex_free(sdp);
 690         /*  Take apart glock structures and buffer lists  */
 691         gfs2_gl_hash_clear(sdp);
 692         gfs2_delete_debugfs_file(sdp);
 693         /*  Unmount the locking protocol  */
 694         gfs2_lm_unmount(sdp);
 695 
 696         /*  At this point, we're through participating in the lockspace  */
 697         gfs2_sys_fs_del(sdp);
 698 }
 699 
 700 /**
 701  * gfs2_sync_fs - sync the filesystem
 702  * @sb: the superblock
 703  *
 704  * Flushes the log to disk.
 705  */
 706 
 707 static int gfs2_sync_fs(struct super_block *sb, int wait)
 708 {
 709         struct gfs2_sbd *sdp = sb->s_fs_info;
 710 
 711         gfs2_quota_sync(sb, -1);
 712         if (wait)
 713                 gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_NORMAL |
 714                                GFS2_LFC_SYNC_FS);
 715         return sdp->sd_log_error;
 716 }
 717 
 718 void gfs2_freeze_func(struct work_struct *work)
 719 {
 720         int error;
 721         struct gfs2_holder freeze_gh;
 722         struct gfs2_sbd *sdp = container_of(work, struct gfs2_sbd, sd_freeze_work);
 723         struct super_block *sb = sdp->sd_vfs;
 724 
 725         atomic_inc(&sb->s_active);
 726         error = gfs2_glock_nq_init(sdp->sd_freeze_gl, LM_ST_SHARED, 0,
 727                                    &freeze_gh);
 728         if (error) {
 729                 fs_info(sdp, "GFS2: couldn't get freeze lock : %d\n", error);
 730                 gfs2_assert_withdraw(sdp, 0);
 731         } else {
 732                 atomic_set(&sdp->sd_freeze_state, SFS_UNFROZEN);
 733                 error = thaw_super(sb);
 734                 if (error) {
 735                         fs_info(sdp, "GFS2: couldn't thaw filesystem: %d\n",
 736                                 error);
 737                         gfs2_assert_withdraw(sdp, 0);
 738                 }
 739                 if (!test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags))
 740                         freeze_gh.gh_flags |= GL_NOCACHE;
 741                 gfs2_glock_dq_uninit(&freeze_gh);
 742         }
 743         deactivate_super(sb);
 744         clear_bit_unlock(SDF_FS_FROZEN, &sdp->sd_flags);
 745         wake_up_bit(&sdp->sd_flags, SDF_FS_FROZEN);
 746         return;
 747 }
 748 
 749 /**
 750  * gfs2_freeze - prevent further writes to the filesystem
 751  * @sb: the VFS structure for the filesystem
 752  *
 753  */
 754 
 755 static int gfs2_freeze(struct super_block *sb)
 756 {
 757         struct gfs2_sbd *sdp = sb->s_fs_info;
 758         int error = 0;
 759 
 760         mutex_lock(&sdp->sd_freeze_mutex);
 761         if (atomic_read(&sdp->sd_freeze_state) != SFS_UNFROZEN)
 762                 goto out;
 763 
 764         if (test_bit(SDF_WITHDRAWN, &sdp->sd_flags)) {
 765                 error = -EINVAL;
 766                 goto out;
 767         }
 768 
 769         for (;;) {
 770                 error = gfs2_lock_fs_check_clean(sdp, &sdp->sd_freeze_gh);
 771                 if (!error)
 772                         break;
 773 
 774                 if (error == -EBUSY)
 775                         fs_err(sdp, "waiting for recovery before freeze\n");
 776                 else
 777                         fs_err(sdp, "error freezing FS: %d\n", error);
 778 
 779                 fs_err(sdp, "retrying...\n");
 780                 msleep(1000);
 781         }
 782         set_bit(SDF_FS_FROZEN, &sdp->sd_flags);
 783 out:
 784         mutex_unlock(&sdp->sd_freeze_mutex);
 785         return error;
 786 }
 787 
 788 /**
 789  * gfs2_unfreeze - reallow writes to the filesystem
 790  * @sb: the VFS structure for the filesystem
 791  *
 792  */
 793 
 794 static int gfs2_unfreeze(struct super_block *sb)
 795 {
 796         struct gfs2_sbd *sdp = sb->s_fs_info;
 797 
 798         mutex_lock(&sdp->sd_freeze_mutex);
 799         if (atomic_read(&sdp->sd_freeze_state) != SFS_FROZEN ||
 800             !gfs2_holder_initialized(&sdp->sd_freeze_gh)) {
 801                 mutex_unlock(&sdp->sd_freeze_mutex);
 802                 return 0;
 803         }
 804 
 805         gfs2_glock_dq_uninit(&sdp->sd_freeze_gh);
 806         mutex_unlock(&sdp->sd_freeze_mutex);
 807         return wait_on_bit(&sdp->sd_flags, SDF_FS_FROZEN, TASK_INTERRUPTIBLE);
 808 }
 809 
 810 /**
 811  * statfs_fill - fill in the sg for a given RG
 812  * @rgd: the RG
 813  * @sc: the sc structure
 814  *
 815  * Returns: 0 on success, -ESTALE if the LVB is invalid
 816  */
 817 
 818 static int statfs_slow_fill(struct gfs2_rgrpd *rgd,
 819                             struct gfs2_statfs_change_host *sc)
 820 {
 821         gfs2_rgrp_verify(rgd);
 822         sc->sc_total += rgd->rd_data;
 823         sc->sc_free += rgd->rd_free;
 824         sc->sc_dinodes += rgd->rd_dinodes;
 825         return 0;
 826 }
 827 
 828 /**
 829  * gfs2_statfs_slow - Stat a filesystem using asynchronous locking
 830  * @sdp: the filesystem
 831  * @sc: the sc info that will be returned
 832  *
 833  * Any error (other than a signal) will cause this routine to fall back
 834  * to the synchronous version.
 835  *
 836  * FIXME: This really shouldn't busy wait like this.
 837  *
 838  * Returns: errno
 839  */
 840 
 841 static int gfs2_statfs_slow(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *sc)
 842 {
 843         struct gfs2_rgrpd *rgd_next;
 844         struct gfs2_holder *gha, *gh;
 845         unsigned int slots = 64;
 846         unsigned int x;
 847         int done;
 848         int error = 0, err;
 849 
 850         memset(sc, 0, sizeof(struct gfs2_statfs_change_host));
 851         gha = kmalloc_array(slots, sizeof(struct gfs2_holder), GFP_KERNEL);
 852         if (!gha)
 853                 return -ENOMEM;
 854         for (x = 0; x < slots; x++)
 855                 gfs2_holder_mark_uninitialized(gha + x);
 856 
 857         rgd_next = gfs2_rgrpd_get_first(sdp);
 858 
 859         for (;;) {
 860                 done = 1;
 861 
 862                 for (x = 0; x < slots; x++) {
 863                         gh = gha + x;
 864 
 865                         if (gfs2_holder_initialized(gh) && gfs2_glock_poll(gh)) {
 866                                 err = gfs2_glock_wait(gh);
 867                                 if (err) {
 868                                         gfs2_holder_uninit(gh);
 869                                         error = err;
 870                                 } else {
 871                                         if (!error) {
 872                                                 struct gfs2_rgrpd *rgd =
 873                                                         gfs2_glock2rgrp(gh->gh_gl);
 874 
 875                                                 error = statfs_slow_fill(rgd, sc);
 876                                         }
 877                                         gfs2_glock_dq_uninit(gh);
 878                                 }
 879                         }
 880 
 881                         if (gfs2_holder_initialized(gh))
 882                                 done = 0;
 883                         else if (rgd_next && !error) {
 884                                 error = gfs2_glock_nq_init(rgd_next->rd_gl,
 885                                                            LM_ST_SHARED,
 886                                                            GL_ASYNC,
 887                                                            gh);
 888                                 rgd_next = gfs2_rgrpd_get_next(rgd_next);
 889                                 done = 0;
 890                         }
 891 
 892                         if (signal_pending(current))
 893                                 error = -ERESTARTSYS;
 894                 }
 895 
 896                 if (done)
 897                         break;
 898 
 899                 yield();
 900         }
 901 
 902         kfree(gha);
 903         return error;
 904 }
 905 
 906 /**
 907  * gfs2_statfs_i - Do a statfs
 908  * @sdp: the filesystem
 909  * @sg: the sg structure
 910  *
 911  * Returns: errno
 912  */
 913 
 914 static int gfs2_statfs_i(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *sc)
 915 {
 916         struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
 917         struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
 918 
 919         spin_lock(&sdp->sd_statfs_spin);
 920 
 921         *sc = *m_sc;
 922         sc->sc_total += l_sc->sc_total;
 923         sc->sc_free += l_sc->sc_free;
 924         sc->sc_dinodes += l_sc->sc_dinodes;
 925 
 926         spin_unlock(&sdp->sd_statfs_spin);
 927 
 928         if (sc->sc_free < 0)
 929                 sc->sc_free = 0;
 930         if (sc->sc_free > sc->sc_total)
 931                 sc->sc_free = sc->sc_total;
 932         if (sc->sc_dinodes < 0)
 933                 sc->sc_dinodes = 0;
 934 
 935         return 0;
 936 }
 937 
 938 /**
 939  * gfs2_statfs - Gather and return stats about the filesystem
 940  * @sb: The superblock
 941  * @statfsbuf: The buffer
 942  *
 943  * Returns: 0 on success or error code
 944  */
 945 
 946 static int gfs2_statfs(struct dentry *dentry, struct kstatfs *buf)
 947 {
 948         struct super_block *sb = dentry->d_sb;
 949         struct gfs2_sbd *sdp = sb->s_fs_info;
 950         struct gfs2_statfs_change_host sc;
 951         int error;
 952 
 953         error = gfs2_rindex_update(sdp);
 954         if (error)
 955                 return error;
 956 
 957         if (gfs2_tune_get(sdp, gt_statfs_slow))
 958                 error = gfs2_statfs_slow(sdp, &sc);
 959         else
 960                 error = gfs2_statfs_i(sdp, &sc);
 961 
 962         if (error)
 963                 return error;
 964 
 965         buf->f_type = GFS2_MAGIC;
 966         buf->f_bsize = sdp->sd_sb.sb_bsize;
 967         buf->f_blocks = sc.sc_total;
 968         buf->f_bfree = sc.sc_free;
 969         buf->f_bavail = sc.sc_free;
 970         buf->f_files = sc.sc_dinodes + sc.sc_free;
 971         buf->f_ffree = sc.sc_free;
 972         buf->f_namelen = GFS2_FNAMESIZE;
 973 
 974         return 0;
 975 }
 976 
 977 /**
 978  * gfs2_drop_inode - Drop an inode (test for remote unlink)
 979  * @inode: The inode to drop
 980  *
 981  * If we've received a callback on an iopen lock then it's because a
 982  * remote node tried to deallocate the inode but failed due to this node
 983  * still having the inode open. Here we mark the link count zero
 984  * since we know that it must have reached zero if the GLF_DEMOTE flag
 985  * is set on the iopen glock. If we didn't do a disk read since the
 986  * remote node removed the final link then we might otherwise miss
 987  * this event. This check ensures that this node will deallocate the
 988  * inode's blocks, or alternatively pass the baton on to another
 989  * node for later deallocation.
 990  */
 991 
 992 static int gfs2_drop_inode(struct inode *inode)
 993 {
 994         struct gfs2_inode *ip = GFS2_I(inode);
 995 
 996         if (!test_bit(GIF_FREE_VFS_INODE, &ip->i_flags) &&
 997             inode->i_nlink &&
 998             gfs2_holder_initialized(&ip->i_iopen_gh)) {
 999                 struct gfs2_glock *gl = ip->i_iopen_gh.gh_gl;
1000                 if (test_bit(GLF_DEMOTE, &gl->gl_flags))
1001                         clear_nlink(inode);
1002         }
1003 
1004         /*
1005          * When under memory pressure when an inode's link count has dropped to
1006          * zero, defer deleting the inode to the delete workqueue.  This avoids
1007          * calling into DLM under memory pressure, which can deadlock.
1008          */
1009         if (!inode->i_nlink &&
1010             unlikely(current->flags & PF_MEMALLOC) &&
1011             gfs2_holder_initialized(&ip->i_iopen_gh)) {
1012                 struct gfs2_glock *gl = ip->i_iopen_gh.gh_gl;
1013 
1014                 gfs2_glock_hold(gl);
1015                 if (queue_work(gfs2_delete_workqueue, &gl->gl_delete) == 0)
1016                         gfs2_glock_queue_put(gl);
1017                 return false;
1018         }
1019 
1020         return generic_drop_inode(inode);
1021 }
1022 
1023 static int is_ancestor(const struct dentry *d1, const struct dentry *d2)
1024 {
1025         do {
1026                 if (d1 == d2)
1027                         return 1;
1028                 d1 = d1->d_parent;
1029         } while (!IS_ROOT(d1));
1030         return 0;
1031 }
1032 
1033 /**
1034  * gfs2_show_options - Show mount options for /proc/mounts
1035  * @s: seq_file structure
1036  * @root: root of this (sub)tree
1037  *
1038  * Returns: 0 on success or error code
1039  */
1040 
1041 static int gfs2_show_options(struct seq_file *s, struct dentry *root)
1042 {
1043         struct gfs2_sbd *sdp = root->d_sb->s_fs_info;
1044         struct gfs2_args *args = &sdp->sd_args;
1045         int val;
1046 
1047         if (is_ancestor(root, sdp->sd_master_dir))
1048                 seq_puts(s, ",meta");
1049         if (args->ar_lockproto[0])
1050                 seq_show_option(s, "lockproto", args->ar_lockproto);
1051         if (args->ar_locktable[0])
1052                 seq_show_option(s, "locktable", args->ar_locktable);
1053         if (args->ar_hostdata[0])
1054                 seq_show_option(s, "hostdata", args->ar_hostdata);
1055         if (args->ar_spectator)
1056                 seq_puts(s, ",spectator");
1057         if (args->ar_localflocks)
1058                 seq_puts(s, ",localflocks");
1059         if (args->ar_debug)
1060                 seq_puts(s, ",debug");
1061         if (args->ar_posix_acl)
1062                 seq_puts(s, ",acl");
1063         if (args->ar_quota != GFS2_QUOTA_DEFAULT) {
1064                 char *state;
1065                 switch (args->ar_quota) {
1066                 case GFS2_QUOTA_OFF:
1067                         state = "off";
1068                         break;
1069                 case GFS2_QUOTA_ACCOUNT:
1070                         state = "account";
1071                         break;
1072                 case GFS2_QUOTA_ON:
1073                         state = "on";
1074                         break;
1075                 default:
1076                         state = "unknown";
1077                         break;
1078                 }
1079                 seq_printf(s, ",quota=%s", state);
1080         }
1081         if (args->ar_suiddir)
1082                 seq_puts(s, ",suiddir");
1083         if (args->ar_data != GFS2_DATA_DEFAULT) {
1084                 char *state;
1085                 switch (args->ar_data) {
1086                 case GFS2_DATA_WRITEBACK:
1087                         state = "writeback";
1088                         break;
1089                 case GFS2_DATA_ORDERED:
1090                         state = "ordered";
1091                         break;
1092                 default:
1093                         state = "unknown";
1094                         break;
1095                 }
1096                 seq_printf(s, ",data=%s", state);
1097         }
1098         if (args->ar_discard)
1099                 seq_puts(s, ",discard");
1100         val = sdp->sd_tune.gt_logd_secs;
1101         if (val != 30)
1102                 seq_printf(s, ",commit=%d", val);
1103         val = sdp->sd_tune.gt_statfs_quantum;
1104         if (val != 30)
1105                 seq_printf(s, ",statfs_quantum=%d", val);
1106         else if (sdp->sd_tune.gt_statfs_slow)
1107                 seq_puts(s, ",statfs_quantum=0");
1108         val = sdp->sd_tune.gt_quota_quantum;
1109         if (val != 60)
1110                 seq_printf(s, ",quota_quantum=%d", val);
1111         if (args->ar_statfs_percent)
1112                 seq_printf(s, ",statfs_percent=%d", args->ar_statfs_percent);
1113         if (args->ar_errors != GFS2_ERRORS_DEFAULT) {
1114                 const char *state;
1115 
1116                 switch (args->ar_errors) {
1117                 case GFS2_ERRORS_WITHDRAW:
1118                         state = "withdraw";
1119                         break;
1120                 case GFS2_ERRORS_PANIC:
1121                         state = "panic";
1122                         break;
1123                 default:
1124                         state = "unknown";
1125                         break;
1126                 }
1127                 seq_printf(s, ",errors=%s", state);
1128         }
1129         if (test_bit(SDF_NOBARRIERS, &sdp->sd_flags))
1130                 seq_puts(s, ",nobarrier");
1131         if (test_bit(SDF_DEMOTE, &sdp->sd_flags))
1132                 seq_puts(s, ",demote_interface_used");
1133         if (args->ar_rgrplvb)
1134                 seq_puts(s, ",rgrplvb");
1135         if (args->ar_loccookie)
1136                 seq_puts(s, ",loccookie");
1137         return 0;
1138 }
1139 
1140 static void gfs2_final_release_pages(struct gfs2_inode *ip)
1141 {
1142         struct inode *inode = &ip->i_inode;
1143         struct gfs2_glock *gl = ip->i_gl;
1144 
1145         truncate_inode_pages(gfs2_glock2aspace(ip->i_gl), 0);
1146         truncate_inode_pages(&inode->i_data, 0);
1147 
1148         if (atomic_read(&gl->gl_revokes) == 0) {
1149                 clear_bit(GLF_LFLUSH, &gl->gl_flags);
1150                 clear_bit(GLF_DIRTY, &gl->gl_flags);
1151         }
1152 }
1153 
1154 static int gfs2_dinode_dealloc(struct gfs2_inode *ip)
1155 {
1156         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1157         struct gfs2_rgrpd *rgd;
1158         struct gfs2_holder gh;
1159         int error;
1160 
1161         if (gfs2_get_inode_blocks(&ip->i_inode) != 1) {
1162                 gfs2_consist_inode(ip);
1163                 return -EIO;
1164         }
1165 
1166         error = gfs2_rindex_update(sdp);
1167         if (error)
1168                 return error;
1169 
1170         error = gfs2_quota_hold(ip, NO_UID_QUOTA_CHANGE, NO_GID_QUOTA_CHANGE);
1171         if (error)
1172                 return error;
1173 
1174         rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1);
1175         if (!rgd) {
1176                 gfs2_consist_inode(ip);
1177                 error = -EIO;
1178                 goto out_qs;
1179         }
1180 
1181         error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &gh);
1182         if (error)
1183                 goto out_qs;
1184 
1185         error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS + RES_QUOTA,
1186                                  sdp->sd_jdesc->jd_blocks);
1187         if (error)
1188                 goto out_rg_gunlock;
1189 
1190         gfs2_free_di(rgd, ip);
1191 
1192         gfs2_final_release_pages(ip);
1193 
1194         gfs2_trans_end(sdp);
1195 
1196 out_rg_gunlock:
1197         gfs2_glock_dq_uninit(&gh);
1198 out_qs:
1199         gfs2_quota_unhold(ip);
1200         return error;
1201 }
1202 
1203 /**
1204  * gfs2_glock_put_eventually
1205  * @gl: The glock to put
1206  *
1207  * When under memory pressure, trigger a deferred glock put to make sure we
1208  * won't call into DLM and deadlock.  Otherwise, put the glock directly.
1209  */
1210 
1211 static void gfs2_glock_put_eventually(struct gfs2_glock *gl)
1212 {
1213         if (current->flags & PF_MEMALLOC)
1214                 gfs2_glock_queue_put(gl);
1215         else
1216                 gfs2_glock_put(gl);
1217 }
1218 
1219 /**
1220  * gfs2_evict_inode - Remove an inode from cache
1221  * @inode: The inode to evict
1222  *
1223  * There are three cases to consider:
1224  * 1. i_nlink == 0, we are final opener (and must deallocate)
1225  * 2. i_nlink == 0, we are not the final opener (and cannot deallocate)
1226  * 3. i_nlink > 0
1227  *
1228  * If the fs is read only, then we have to treat all cases as per #3
1229  * since we are unable to do any deallocation. The inode will be
1230  * deallocated by the next read/write node to attempt an allocation
1231  * in the same resource group
1232  *
1233  * We have to (at the moment) hold the inodes main lock to cover
1234  * the gap between unlocking the shared lock on the iopen lock and
1235  * taking the exclusive lock. I'd rather do a shared -> exclusive
1236  * conversion on the iopen lock, but we can change that later. This
1237  * is safe, just less efficient.
1238  */
1239 
1240 static void gfs2_evict_inode(struct inode *inode)
1241 {
1242         struct super_block *sb = inode->i_sb;
1243         struct gfs2_sbd *sdp = sb->s_fs_info;
1244         struct gfs2_inode *ip = GFS2_I(inode);
1245         struct gfs2_holder gh;
1246         struct address_space *metamapping;
1247         int error;
1248 
1249         if (test_bit(GIF_FREE_VFS_INODE, &ip->i_flags)) {
1250                 clear_inode(inode);
1251                 return;
1252         }
1253 
1254         if (inode->i_nlink || sb_rdonly(sb))
1255                 goto out;
1256 
1257         if (test_bit(GIF_ALLOC_FAILED, &ip->i_flags)) {
1258                 BUG_ON(!gfs2_glock_is_locked_by_me(ip->i_gl));
1259                 gfs2_holder_mark_uninitialized(&gh);
1260                 goto alloc_failed;
1261         }
1262 
1263         /* Deletes should never happen under memory pressure anymore.  */
1264         if (WARN_ON_ONCE(current->flags & PF_MEMALLOC))
1265                 goto out;
1266 
1267         /* Must not read inode block until block type has been verified */
1268         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, &gh);
1269         if (unlikely(error)) {
1270                 glock_clear_object(ip->i_iopen_gh.gh_gl, ip);
1271                 ip->i_iopen_gh.gh_flags |= GL_NOCACHE;
1272                 gfs2_glock_dq_uninit(&ip->i_iopen_gh);
1273                 goto out;
1274         }
1275 
1276         error = gfs2_check_blk_type(sdp, ip->i_no_addr, GFS2_BLKST_UNLINKED);
1277         if (error)
1278                 goto out_truncate;
1279 
1280         if (test_bit(GIF_INVALID, &ip->i_flags)) {
1281                 error = gfs2_inode_refresh(ip);
1282                 if (error)
1283                         goto out_truncate;
1284         }
1285 
1286         /*
1287          * The inode may have been recreated in the meantime.
1288          */
1289         if (inode->i_nlink)
1290                 goto out_truncate;
1291 
1292 alloc_failed:
1293         if (gfs2_holder_initialized(&ip->i_iopen_gh) &&
1294             test_bit(HIF_HOLDER, &ip->i_iopen_gh.gh_iflags)) {
1295                 ip->i_iopen_gh.gh_flags |= GL_NOCACHE;
1296                 gfs2_glock_dq_wait(&ip->i_iopen_gh);
1297                 gfs2_holder_reinit(LM_ST_EXCLUSIVE, LM_FLAG_TRY_1CB | GL_NOCACHE,
1298                                    &ip->i_iopen_gh);
1299                 error = gfs2_glock_nq(&ip->i_iopen_gh);
1300                 if (error)
1301                         goto out_truncate;
1302         }
1303 
1304         if (S_ISDIR(inode->i_mode) &&
1305             (ip->i_diskflags & GFS2_DIF_EXHASH)) {
1306                 error = gfs2_dir_exhash_dealloc(ip);
1307                 if (error)
1308                         goto out_unlock;
1309         }
1310 
1311         if (ip->i_eattr) {
1312                 error = gfs2_ea_dealloc(ip);
1313                 if (error)
1314                         goto out_unlock;
1315         }
1316 
1317         if (!gfs2_is_stuffed(ip)) {
1318                 error = gfs2_file_dealloc(ip);
1319                 if (error)
1320                         goto out_unlock;
1321         }
1322 
1323         /* We're about to clear the bitmap for the dinode, but as soon as we
1324            do, gfs2_create_inode can create another inode at the same block
1325            location and try to set gl_object again. We clear gl_object here so
1326            that subsequent inode creates don't see an old gl_object. */
1327         glock_clear_object(ip->i_gl, ip);
1328         error = gfs2_dinode_dealloc(ip);
1329         goto out_unlock;
1330 
1331 out_truncate:
1332         gfs2_log_flush(sdp, ip->i_gl, GFS2_LOG_HEAD_FLUSH_NORMAL |
1333                        GFS2_LFC_EVICT_INODE);
1334         metamapping = gfs2_glock2aspace(ip->i_gl);
1335         if (test_bit(GLF_DIRTY, &ip->i_gl->gl_flags)) {
1336                 filemap_fdatawrite(metamapping);
1337                 filemap_fdatawait(metamapping);
1338         }
1339         write_inode_now(inode, 1);
1340         gfs2_ail_flush(ip->i_gl, 0);
1341 
1342         error = gfs2_trans_begin(sdp, 0, sdp->sd_jdesc->jd_blocks);
1343         if (error)
1344                 goto out_unlock;
1345         /* Needs to be done before glock release & also in a transaction */
1346         truncate_inode_pages(&inode->i_data, 0);
1347         truncate_inode_pages(metamapping, 0);
1348         gfs2_trans_end(sdp);
1349 
1350 out_unlock:
1351         if (gfs2_rs_active(&ip->i_res))
1352                 gfs2_rs_deltree(&ip->i_res);
1353 
1354         if (gfs2_holder_initialized(&ip->i_iopen_gh)) {
1355                 glock_clear_object(ip->i_iopen_gh.gh_gl, ip);
1356                 if (test_bit(HIF_HOLDER, &ip->i_iopen_gh.gh_iflags)) {
1357                         ip->i_iopen_gh.gh_flags |= GL_NOCACHE;
1358                         gfs2_glock_dq(&ip->i_iopen_gh);
1359                 }
1360                 gfs2_holder_uninit(&ip->i_iopen_gh);
1361         }
1362         if (gfs2_holder_initialized(&gh)) {
1363                 glock_clear_object(ip->i_gl, ip);
1364                 gfs2_glock_dq_uninit(&gh);
1365         }
1366         if (error && error != GLR_TRYFAILED && error != -EROFS)
1367                 fs_warn(sdp, "gfs2_evict_inode: %d\n", error);
1368 out:
1369         truncate_inode_pages_final(&inode->i_data);
1370         gfs2_rsqa_delete(ip, NULL);
1371         gfs2_ordered_del_inode(ip);
1372         clear_inode(inode);
1373         gfs2_dir_hash_inval(ip);
1374         glock_clear_object(ip->i_gl, ip);
1375         wait_on_bit_io(&ip->i_flags, GIF_GLOP_PENDING, TASK_UNINTERRUPTIBLE);
1376         gfs2_glock_add_to_lru(ip->i_gl);
1377         gfs2_glock_put_eventually(ip->i_gl);
1378         ip->i_gl = NULL;
1379         if (gfs2_holder_initialized(&ip->i_iopen_gh)) {
1380                 struct gfs2_glock *gl = ip->i_iopen_gh.gh_gl;
1381 
1382                 glock_clear_object(gl, ip);
1383                 ip->i_iopen_gh.gh_flags |= GL_NOCACHE;
1384                 gfs2_glock_hold(gl);
1385                 gfs2_glock_dq_uninit(&ip->i_iopen_gh);
1386                 gfs2_glock_put_eventually(gl);
1387         }
1388 }
1389 
1390 static struct inode *gfs2_alloc_inode(struct super_block *sb)
1391 {
1392         struct gfs2_inode *ip;
1393 
1394         ip = kmem_cache_alloc(gfs2_inode_cachep, GFP_KERNEL);
1395         if (!ip)
1396                 return NULL;
1397         ip->i_flags = 0;
1398         ip->i_gl = NULL;
1399         memset(&ip->i_res, 0, sizeof(ip->i_res));
1400         RB_CLEAR_NODE(&ip->i_res.rs_node);
1401         ip->i_rahead = 0;
1402         return &ip->i_inode;
1403 }
1404 
1405 static void gfs2_free_inode(struct inode *inode)
1406 {
1407         kmem_cache_free(gfs2_inode_cachep, GFS2_I(inode));
1408 }
1409 
1410 const struct super_operations gfs2_super_ops = {
1411         .alloc_inode            = gfs2_alloc_inode,
1412         .free_inode             = gfs2_free_inode,
1413         .write_inode            = gfs2_write_inode,
1414         .dirty_inode            = gfs2_dirty_inode,
1415         .evict_inode            = gfs2_evict_inode,
1416         .put_super              = gfs2_put_super,
1417         .sync_fs                = gfs2_sync_fs,
1418         .freeze_super           = gfs2_freeze,
1419         .thaw_super             = gfs2_unfreeze,
1420         .statfs                 = gfs2_statfs,
1421         .drop_inode             = gfs2_drop_inode,
1422         .show_options           = gfs2_show_options,
1423 };
1424
/* [<][>][^][v][top][bottom][index][help] */
root/fs/gfs2/super.c

DEFINITIONS
