fs/gfs2/super.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
   4  * Copyright (C) 2004-2007 Red Hat, Inc.  All rights reserved.
   5  */
   6
   7 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
   8
   9 #include <linux/bio.h>
  10 #include <linux/sched/signal.h>
  11 #include <linux/slab.h>
  12 #include <linux/spinlock.h>
  13 #include <linux/completion.h>
  14 #include <linux/buffer_head.h>
  15 #include <linux/statfs.h>
  16 #include <linux/seq_file.h>
  17 #include <linux/mount.h>
  18 #include <linux/kthread.h>
  19 #include <linux/delay.h>
  20 #include <linux/gfs2_ondisk.h>
  21 #include <linux/crc32.h>
  22 #include <linux/time.h>
  23 #include <linux/wait.h>
  24 #include <linux/writeback.h>
  25 #include <linux/backing-dev.h>
  26 #include <linux/kernel.h>
  27
  28 #include "gfs2.h"
  29 #include "incore.h"
  30 #include "bmap.h"
  31 #include "dir.h"
  32 #include "glock.h"
  33 #include "glops.h"
  34 #include "inode.h"
  35 #include "log.h"
  36 #include "meta_io.h"
  37 #include "quota.h"
  38 #include "recovery.h"
  39 #include "rgrp.h"
  40 #include "super.h"
  41 #include "trans.h"
  42 #include "util.h"
  43 #include "sys.h"
  44 #include "xattr.h"
  45 #include "lops.h"
  46
  47 /**
  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         sdp->sd_jdesc = NULL;
  65         while (!list_empty(&list)) {
  66                 jd = list_first_entry(&list, struct gfs2_jdesc, jd_list);
  67                 gfs2_free_journal_extents(jd);
  68                 list_del(&jd->jd_list);
  69                 iput(jd->jd_inode);
  70                 jd->jd_inode = NULL;
  71                 kfree(jd);
  72         }
  73 }
  74
  75 static struct gfs2_jdesc *jdesc_find_i(struct list_head *head, unsigned int jid)
  76 {
  77         struct gfs2_jdesc *jd;
  78         int found = 0;
  79
  80         list_for_each_entry(jd, head, jd_list) {
  81                 if (jd->jd_jid == jid) {
  82                         found = 1;
  83                         break;
  84                 }
  85         }
  86
  87         if (!found)
  88                 jd = NULL;
  89
  90         return jd;
  91 }
  92
  93 struct gfs2_jdesc *gfs2_jdesc_find(struct gfs2_sbd *sdp, unsigned int jid)
  94 {
  95         struct gfs2_jdesc *jd;
  96
  97         spin_lock(&sdp->sd_jindex_spin);
  98         jd = jdesc_find_i(&sdp->sd_jindex_list, jid);
  99         spin_unlock(&sdp->sd_jindex_spin);
 100
 101         return jd;
 102 }
 103
 104 int gfs2_jdesc_check(struct gfs2_jdesc *jd)
 105 {
 106         struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
 107         struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
 108         u64 size = i_size_read(jd->jd_inode);
 109
 110         if (gfs2_check_internal_file_size(jd->jd_inode, 8 << 20, BIT(30)))
 111                 return -EIO;
 112
 113         jd->jd_blocks = size >> sdp->sd_sb.sb_bsize_shift;
 114
 115         if (gfs2_write_alloc_required(ip, 0, size)) {
 116                 gfs2_consist_inode(ip);
 117                 return -EIO;
 118         }
 119
 120         return 0;
 121 }
 122
 123 static int init_threads(struct gfs2_sbd *sdp)
 124 {
 125         struct task_struct *p;
 126         int error = 0;
 127
 128         p = kthread_run(gfs2_logd, sdp, "gfs2_logd");
 129         if (IS_ERR(p)) {
 130                 error = PTR_ERR(p);
 131                 fs_err(sdp, "can't start logd thread: %d\n", error);
 132                 return error;
 133         }
 134         sdp->sd_logd_process = p;
 135
 136         p = kthread_run(gfs2_quotad, sdp, "gfs2_quotad");
 137         if (IS_ERR(p)) {
 138                 error = PTR_ERR(p);
 139                 fs_err(sdp, "can't start quotad thread: %d\n", error);
 140                 goto fail;
 141         }
 142         sdp->sd_quotad_process = p;
 143         return 0;
 144
 145 fail:
 146         kthread_stop(sdp->sd_logd_process);
 147         sdp->sd_logd_process = NULL;
 148         return error;
 149 }
 150
 151 /**
 152  * gfs2_make_fs_rw - Turn a Read-Only FS into a Read-Write one
 153  * @sdp: the filesystem
 154  *
 155  * Returns: errno
 156  */
 157
 158 int gfs2_make_fs_rw(struct gfs2_sbd *sdp)
 159 {
 160         struct gfs2_inode *ip = GFS2_I(sdp->sd_jdesc->jd_inode);
 161         struct gfs2_glock *j_gl = ip->i_gl;
 162         struct gfs2_holder freeze_gh;
 163         struct gfs2_log_header_host head;
 164         int error;
 165
 166         error = init_threads(sdp);
 167         if (error)
 168                 return error;
 169
 170         error = gfs2_glock_nq_init(sdp->sd_freeze_gl, LM_ST_SHARED,
 171                                    LM_FLAG_NOEXP | GL_EXACT,
 172                                    &freeze_gh);
 173         if (error)
 174                 goto fail_threads;
 175
 176         j_gl->gl_ops->go_inval(j_gl, DIO_METADATA);
 177         if (gfs2_withdrawn(sdp)) {
 178                 error = -EIO;
 179                 goto fail;
 180         }
 181
 182         error = gfs2_find_jhead(sdp->sd_jdesc, &head, false);
 183         if (error || gfs2_withdrawn(sdp))
 184                 goto fail;
 185
 186         if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) {
 187                 gfs2_consist(sdp);
 188                 error = -EIO;
 189                 goto fail;
 190         }
 191
 192         /*  Initialize some head of the log stuff  */
 193         sdp->sd_log_sequence = head.lh_sequence + 1;
 194         gfs2_log_pointers_init(sdp, head.lh_blkno);
 195
 196         error = gfs2_quota_init(sdp);
 197         if (error || gfs2_withdrawn(sdp))
 198                 goto fail;
 199
 200         set_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags);
 201
 202         gfs2_glock_dq_uninit(&freeze_gh);
 203
 204         return 0;
 205
 206 fail:
 207         gfs2_glock_dq_uninit(&freeze_gh);
 208 fail_threads:
 209         if (sdp->sd_quotad_process)
 210                 kthread_stop(sdp->sd_quotad_process);
 211         sdp->sd_quotad_process = NULL;
 212         if (sdp->sd_logd_process)
 213                 kthread_stop(sdp->sd_logd_process);
 214         sdp->sd_logd_process = NULL;
 215         return error;
 216 }
 217
 218 void gfs2_statfs_change_in(struct gfs2_statfs_change_host *sc, const void *buf)
 219 {
 220         const struct gfs2_statfs_change *str = buf;
 221
 222         sc->sc_total = be64_to_cpu(str->sc_total);
 223         sc->sc_free = be64_to_cpu(str->sc_free);
 224         sc->sc_dinodes = be64_to_cpu(str->sc_dinodes);
 225 }
 226
 227 static void gfs2_statfs_change_out(const struct gfs2_statfs_change_host *sc, void *buf)
 228 {
 229         struct gfs2_statfs_change *str = buf;
 230
 231         str->sc_total = cpu_to_be64(sc->sc_total);
 232         str->sc_free = cpu_to_be64(sc->sc_free);
 233         str->sc_dinodes = cpu_to_be64(sc->sc_dinodes);
 234 }
 235
 236 int gfs2_statfs_init(struct gfs2_sbd *sdp)
 237 {
 238         struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
 239         struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
 240         struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
 241         struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
 242         struct buffer_head *m_bh, *l_bh;
 243         struct gfs2_holder gh;
 244         int error;
 245
 246         error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE,
 247                                    &gh);
 248         if (error)
 249                 return error;
 250
 251         error = gfs2_meta_inode_buffer(m_ip, &m_bh);
 252         if (error)
 253                 goto out;
 254
 255         if (sdp->sd_args.ar_spectator) {
 256                 spin_lock(&sdp->sd_statfs_spin);
 257                 gfs2_statfs_change_in(m_sc, m_bh->b_data +
 258                                       sizeof(struct gfs2_dinode));
 259                 spin_unlock(&sdp->sd_statfs_spin);
 260         } else {
 261                 error = gfs2_meta_inode_buffer(l_ip, &l_bh);
 262                 if (error)
 263                         goto out_m_bh;
 264
 265                 spin_lock(&sdp->sd_statfs_spin);
 266                 gfs2_statfs_change_in(m_sc, m_bh->b_data +
 267                                       sizeof(struct gfs2_dinode));
 268                 gfs2_statfs_change_in(l_sc, l_bh->b_data +
 269                                       sizeof(struct gfs2_dinode));
 270                 spin_unlock(&sdp->sd_statfs_spin);
 271
 272                 brelse(l_bh);
 273         }
 274
 275 out_m_bh:
 276         brelse(m_bh);
 277 out:
 278         gfs2_glock_dq_uninit(&gh);
 279         return 0;
 280 }
 281
 282 void gfs2_statfs_change(struct gfs2_sbd *sdp, s64 total, s64 free,
 283                         s64 dinodes)
 284 {
 285         struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
 286         struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
 287         struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
 288         struct buffer_head *l_bh;
 289         s64 x, y;
 290         int need_sync = 0;
 291         int error;
 292
 293         error = gfs2_meta_inode_buffer(l_ip, &l_bh);
 294         if (error)
 295                 return;
 296
 297         gfs2_trans_add_meta(l_ip->i_gl, l_bh);
 298
 299         spin_lock(&sdp->sd_statfs_spin);
 300         l_sc->sc_total += total;
 301         l_sc->sc_free += free;
 302         l_sc->sc_dinodes += dinodes;
 303         gfs2_statfs_change_out(l_sc, l_bh->b_data + sizeof(struct gfs2_dinode));
 304         if (sdp->sd_args.ar_statfs_percent) {
 305                 x = 100 * l_sc->sc_free;
 306                 y = m_sc->sc_free * sdp->sd_args.ar_statfs_percent;
 307                 if (x >= y || x <= -y)
 308                         need_sync = 1;
 309         }
 310         spin_unlock(&sdp->sd_statfs_spin);
 311
 312         brelse(l_bh);
 313         if (need_sync)
 314                 gfs2_wake_up_statfs(sdp);
 315 }
 316
 317 void update_statfs(struct gfs2_sbd *sdp, struct buffer_head *m_bh,
 318                    struct buffer_head *l_bh)
 319 {
 320         struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
 321         struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
 322         struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
 323         struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
 324
 325         gfs2_trans_add_meta(l_ip->i_gl, l_bh);
 326         gfs2_trans_add_meta(m_ip->i_gl, m_bh);
 327
 328         spin_lock(&sdp->sd_statfs_spin);
 329         m_sc->sc_total += l_sc->sc_total;
 330         m_sc->sc_free += l_sc->sc_free;
 331         m_sc->sc_dinodes += l_sc->sc_dinodes;
 332         memset(l_sc, 0, sizeof(struct gfs2_statfs_change));
 333         memset(l_bh->b_data + sizeof(struct gfs2_dinode),
 334                0, sizeof(struct gfs2_statfs_change));
 335         gfs2_statfs_change_out(m_sc, m_bh->b_data + sizeof(struct gfs2_dinode));
 336         spin_unlock(&sdp->sd_statfs_spin);
 337 }
 338
 339 int gfs2_statfs_sync(struct super_block *sb, int type)
 340 {
 341         struct gfs2_sbd *sdp = sb->s_fs_info;
 342         struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
 343         struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
 344         struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
 345         struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
 346         struct gfs2_holder gh;
 347         struct buffer_head *m_bh, *l_bh;
 348         int error;
 349
 350         sb_start_write(sb);
 351         error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE,
 352                                    &gh);
 353         if (error)
 354                 goto out;
 355
 356         error = gfs2_meta_inode_buffer(m_ip, &m_bh);
 357         if (error)
 358                 goto out_unlock;
 359
 360         spin_lock(&sdp->sd_statfs_spin);
 361         gfs2_statfs_change_in(m_sc, m_bh->b_data +
 362                               sizeof(struct gfs2_dinode));
 363         if (!l_sc->sc_total && !l_sc->sc_free && !l_sc->sc_dinodes) {
 364                 spin_unlock(&sdp->sd_statfs_spin);
 365                 goto out_bh;
 366         }
 367         spin_unlock(&sdp->sd_statfs_spin);
 368
 369         error = gfs2_meta_inode_buffer(l_ip, &l_bh);
 370         if (error)
 371                 goto out_bh;
 372
 373         error = gfs2_trans_begin(sdp, 2 * RES_DINODE, 0);
 374         if (error)
 375                 goto out_bh2;
 376
 377         update_statfs(sdp, m_bh, l_bh);
 378         sdp->sd_statfs_force_sync = 0;
 379
 380         gfs2_trans_end(sdp);
 381
 382 out_bh2:
 383         brelse(l_bh);
 384 out_bh:
 385         brelse(m_bh);
 386 out_unlock:
 387         gfs2_glock_dq_uninit(&gh);
 388 out:
 389         sb_end_write(sb);
 390         return error;
 391 }
 392
 393 struct lfcc {
 394         struct list_head list;
 395         struct gfs2_holder gh;
 396 };
 397
 398 /**
 399  * gfs2_lock_fs_check_clean - Stop all writes to the FS and check that all
 400  *                            journals are clean
 401  * @sdp: the file system
 402  * @state: the state to put the transaction lock into
 403  * @t_gh: the hold on the transaction lock
 404  *
 405  * Returns: errno
 406  */
 407
 408 static int gfs2_lock_fs_check_clean(struct gfs2_sbd *sdp)
 409 {
 410         struct gfs2_inode *ip;
 411         struct gfs2_jdesc *jd;
 412         struct lfcc *lfcc;
 413         LIST_HEAD(list);
 414         struct gfs2_log_header_host lh;
 415         int error;
 416
 417         list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
 418                 lfcc = kmalloc(sizeof(struct lfcc), GFP_KERNEL);
 419                 if (!lfcc) {
 420                         error = -ENOMEM;
 421                         goto out;
 422                 }
 423                 ip = GFS2_I(jd->jd_inode);
 424                 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &lfcc->gh);
 425                 if (error) {
 426                         kfree(lfcc);
 427                         goto out;
 428                 }
 429                 list_add(&lfcc->list, &list);
 430         }
 431
 432         error = gfs2_glock_nq_init(sdp->sd_freeze_gl, LM_ST_EXCLUSIVE,
 433                                    LM_FLAG_NOEXP, &sdp->sd_freeze_gh);
 434         if (error)
 435                 goto out;
 436
 437         list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
 438                 error = gfs2_jdesc_check(jd);
 439                 if (error)
 440                         break;
 441                 error = gfs2_find_jhead(jd, &lh, false);
 442                 if (error)
 443                         break;
 444                 if (!(lh.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) {
 445                         error = -EBUSY;
 446                         break;
 447                 }
 448         }
 449
 450         if (error)
 451                 gfs2_glock_dq_uninit(&sdp->sd_freeze_gh);
 452
 453 out:
 454         while (!list_empty(&list)) {
 455                 lfcc = list_first_entry(&list, struct lfcc, list);
 456                 list_del(&lfcc->list);
 457                 gfs2_glock_dq_uninit(&lfcc->gh);
 458                 kfree(lfcc);
 459         }
 460         return error;
 461 }
 462
 463 void gfs2_dinode_out(const struct gfs2_inode *ip, void *buf)
 464 {
 465         struct gfs2_dinode *str = buf;
 466
 467         str->di_header.mh_magic = cpu_to_be32(GFS2_MAGIC);
 468         str->di_header.mh_type = cpu_to_be32(GFS2_METATYPE_DI);
 469         str->di_header.mh_format = cpu_to_be32(GFS2_FORMAT_DI);
 470         str->di_num.no_addr = cpu_to_be64(ip->i_no_addr);
 471         str->di_num.no_formal_ino = cpu_to_be64(ip->i_no_formal_ino);
 472         str->di_mode = cpu_to_be32(ip->i_inode.i_mode);
 473         str->di_uid = cpu_to_be32(i_uid_read(&ip->i_inode));
 474         str->di_gid = cpu_to_be32(i_gid_read(&ip->i_inode));
 475         str->di_nlink = cpu_to_be32(ip->i_inode.i_nlink);
 476         str->di_size = cpu_to_be64(i_size_read(&ip->i_inode));
 477         str->di_blocks = cpu_to_be64(gfs2_get_inode_blocks(&ip->i_inode));
 478         str->di_atime = cpu_to_be64(ip->i_inode.i_atime.tv_sec);
 479         str->di_mtime = cpu_to_be64(ip->i_inode.i_mtime.tv_sec);
 480         str->di_ctime = cpu_to_be64(ip->i_inode.i_ctime.tv_sec);
 481
 482         str->di_goal_meta = cpu_to_be64(ip->i_goal);
 483         str->di_goal_data = cpu_to_be64(ip->i_goal);
 484         str->di_generation = cpu_to_be64(ip->i_generation);
 485
 486         str->di_flags = cpu_to_be32(ip->i_diskflags);
 487         str->di_height = cpu_to_be16(ip->i_height);
 488         str->di_payload_format = cpu_to_be32(S_ISDIR(ip->i_inode.i_mode) &&
 489                                              !(ip->i_diskflags & GFS2_DIF_EXHASH) ?
 490                                              GFS2_FORMAT_DE : 0);
 491         str->di_depth = cpu_to_be16(ip->i_depth);
 492         str->di_entries = cpu_to_be32(ip->i_entries);
 493
 494         str->di_eattr = cpu_to_be64(ip->i_eattr);
 495         str->di_atime_nsec = cpu_to_be32(ip->i_inode.i_atime.tv_nsec);
 496         str->di_mtime_nsec = cpu_to_be32(ip->i_inode.i_mtime.tv_nsec);
 497         str->di_ctime_nsec = cpu_to_be32(ip->i_inode.i_ctime.tv_nsec);
 498 }
 499
 500 /**
 501  * gfs2_write_inode - Make sure the inode is stable on the disk
 502  * @inode: The inode
 503  * @wbc: The writeback control structure
 504  *
 505  * Returns: errno
 506  */
 507
 508 static int gfs2_write_inode(struct inode *inode, struct writeback_control *wbc)
 509 {
 510         struct gfs2_inode *ip = GFS2_I(inode);
 511         struct gfs2_sbd *sdp = GFS2_SB(inode);
 512         struct address_space *metamapping = gfs2_glock2aspace(ip->i_gl);
 513         struct backing_dev_info *bdi = inode_to_bdi(metamapping->host);
 514         int ret = 0;
 515         bool flush_all = (wbc->sync_mode == WB_SYNC_ALL || gfs2_is_jdata(ip));
 516
 517         if (flush_all)
 518                 gfs2_log_flush(GFS2_SB(inode), ip->i_gl,
 519                                GFS2_LOG_HEAD_FLUSH_NORMAL |
 520                                GFS2_LFC_WRITE_INODE);
 521         if (bdi->wb.dirty_exceeded)
 522                 gfs2_ail1_flush(sdp, wbc);
 523         else
 524                 filemap_fdatawrite(metamapping);
 525         if (flush_all)
 526                 ret = filemap_fdatawait(metamapping);
 527         if (ret)
 528                 mark_inode_dirty_sync(inode);
 529         else {
 530                 spin_lock(&inode->i_lock);
 531                 if (!(inode->i_flags & I_DIRTY))
 532                         gfs2_ordered_del_inode(ip);
 533                 spin_unlock(&inode->i_lock);
 534         }
 535         return ret;
 536 }
 537
 538 /**
 539  * gfs2_dirty_inode - check for atime updates
 540  * @inode: The inode in question
 541  * @flags: The type of dirty
 542  *
 543  * Unfortunately it can be called under any combination of inode
 544  * glock and transaction lock, so we have to check carefully.
 545  *
 546  * At the moment this deals only with atime - it should be possible
 547  * to expand that role in future, once a review of the locking has
 548  * been carried out.
 549  */
 550
 551 static void gfs2_dirty_inode(struct inode *inode, int flags)
 552 {
 553         struct gfs2_inode *ip = GFS2_I(inode);
 554         struct gfs2_sbd *sdp = GFS2_SB(inode);
 555         struct buffer_head *bh;
 556         struct gfs2_holder gh;
 557         int need_unlock = 0;
 558         int need_endtrans = 0;
 559         int ret;
 560
 561         if (!(flags & I_DIRTY_INODE))
 562                 return;
 563         if (unlikely(gfs2_withdrawn(sdp)))
 564                 return;
 565         if (!gfs2_glock_is_locked_by_me(ip->i_gl)) {
 566                 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
 567                 if (ret) {
 568                         fs_err(sdp, "dirty_inode: glock %d\n", ret);
 569                         gfs2_dump_glock(NULL, ip->i_gl, true);
 570                         return;
 571                 }
 572                 need_unlock = 1;
 573         } else if (WARN_ON_ONCE(ip->i_gl->gl_state != LM_ST_EXCLUSIVE))
 574                 return;
 575
 576         if (current->journal_info == NULL) {
 577                 ret = gfs2_trans_begin(sdp, RES_DINODE, 0);
 578                 if (ret) {
 579                         fs_err(sdp, "dirty_inode: gfs2_trans_begin %d\n", ret);
 580                         goto out;
 581                 }
 582                 need_endtrans = 1;
 583         }
 584
 585         ret = gfs2_meta_inode_buffer(ip, &bh);
 586         if (ret == 0) {
 587                 gfs2_trans_add_meta(ip->i_gl, bh);
 588                 gfs2_dinode_out(ip, bh->b_data);
 589                 brelse(bh);
 590         }
 591
 592         if (need_endtrans)
 593                 gfs2_trans_end(sdp);
 594 out:
 595         if (need_unlock)
 596                 gfs2_glock_dq_uninit(&gh);
 597 }
 598
 599 /**
 600  * gfs2_make_fs_ro - Turn a Read-Write FS into a Read-Only one
 601  * @sdp: the filesystem
 602  *
 603  * Returns: errno
 604  */
 605
 606 int gfs2_make_fs_ro(struct gfs2_sbd *sdp)
 607 {
 608         struct gfs2_holder freeze_gh;
 609         int error = 0;
 610         int log_write_allowed = test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags);
 611
 612         gfs2_holder_mark_uninitialized(&freeze_gh);
 613         if (sdp->sd_freeze_gl &&
 614             !gfs2_glock_is_locked_by_me(sdp->sd_freeze_gl)) {
 615                 if (!log_write_allowed) {
 616                         error = gfs2_glock_nq_init(sdp->sd_freeze_gl,
 617                                                    LM_ST_SHARED, LM_FLAG_TRY |
 618                                                    LM_FLAG_NOEXP | GL_EXACT,
 619                                                    &freeze_gh);
 620                         if (error == GLR_TRYFAILED)
 621                                 error = 0;
 622                 } else {
 623                         error = gfs2_glock_nq_init(sdp->sd_freeze_gl,
 624                                                    LM_ST_SHARED,
 625                                                    LM_FLAG_NOEXP | GL_EXACT,
 626                                                    &freeze_gh);
 627                         if (error && !gfs2_withdrawn(sdp))
 628                                 return error;
 629                 }
 630         }
 631
 632         gfs2_flush_delete_work(sdp);
 633         if (!log_write_allowed && current == sdp->sd_quotad_process)
 634                 fs_warn(sdp, "The quotad daemon is withdrawing.\n");
 635         else if (sdp->sd_quotad_process)
 636                 kthread_stop(sdp->sd_quotad_process);
 637         sdp->sd_quotad_process = NULL;
 638
 639         if (!log_write_allowed && current == sdp->sd_logd_process)
 640                 fs_warn(sdp, "The logd daemon is withdrawing.\n");
 641         else if (sdp->sd_logd_process)
 642                 kthread_stop(sdp->sd_logd_process);
 643         sdp->sd_logd_process = NULL;
 644
 645         if (log_write_allowed) {
 646                 gfs2_quota_sync(sdp->sd_vfs, 0);
 647                 gfs2_statfs_sync(sdp->sd_vfs, 0);
 648
 649                 gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_SHUTDOWN |
 650                                GFS2_LFC_MAKE_FS_RO);
 651                 wait_event(sdp->sd_reserving_log_wait,
 652                            atomic_read(&sdp->sd_reserving_log) == 0);
 653                 gfs2_assert_warn(sdp, atomic_read(&sdp->sd_log_blks_free) ==
 654                                  sdp->sd_jdesc->jd_blocks);
 655         } else {
 656                 wait_event_timeout(sdp->sd_reserving_log_wait,
 657                                    atomic_read(&sdp->sd_reserving_log) == 0,
 658                                    HZ * 5);
 659         }
 660         if (gfs2_holder_initialized(&freeze_gh))
 661                 gfs2_glock_dq_uninit(&freeze_gh);
 662
 663         gfs2_quota_cleanup(sdp);
 664
 665         if (!log_write_allowed)
 666                 sdp->sd_vfs->s_flags |= SB_RDONLY;
 667
 668         return error;
 669 }
 670
 671 /**
 672  * gfs2_put_super - Unmount the filesystem
 673  * @sb: The VFS superblock
 674  *
 675  */
 676
 677 static void gfs2_put_super(struct super_block *sb)
 678 {
 679         struct gfs2_sbd *sdp = sb->s_fs_info;
 680         int error;
 681         struct gfs2_jdesc *jd;
 682
 683         /* No more recovery requests */
 684         set_bit(SDF_NORECOVERY, &sdp->sd_flags);
 685         smp_mb();
 686
 687         /* Wait on outstanding recovery */
 688 restart:
 689         spin_lock(&sdp->sd_jindex_spin);
 690         list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
 691                 if (!test_bit(JDF_RECOVERY, &jd->jd_flags))
 692                         continue;
 693                 spin_unlock(&sdp->sd_jindex_spin);
 694                 wait_on_bit(&jd->jd_flags, JDF_RECOVERY,
 695                             TASK_UNINTERRUPTIBLE);
 696                 goto restart;
 697         }
 698         spin_unlock(&sdp->sd_jindex_spin);
 699
 700         if (!sb_rdonly(sb)) {
 701                 error = gfs2_make_fs_ro(sdp);
 702                 if (error)
 703                         gfs2_io_error(sdp);
 704         }
 705         /*  At this point, we're through modifying the disk  */
 706
 707         /*  Release stuff  */
 708
 709         iput(sdp->sd_jindex);
 710         iput(sdp->sd_statfs_inode);
 711         iput(sdp->sd_rindex);
 712         iput(sdp->sd_quota_inode);
 713
 714         gfs2_glock_put(sdp->sd_rename_gl);
 715         gfs2_glock_put(sdp->sd_freeze_gl);
 716
 717         if (!sdp->sd_args.ar_spectator) {
 718                 if (gfs2_holder_initialized(&sdp->sd_journal_gh))
 719                         gfs2_glock_dq_uninit(&sdp->sd_journal_gh);
 720                 if (gfs2_holder_initialized(&sdp->sd_jinode_gh))
 721                         gfs2_glock_dq_uninit(&sdp->sd_jinode_gh);
 722                 gfs2_glock_dq_uninit(&sdp->sd_sc_gh);
 723                 gfs2_glock_dq_uninit(&sdp->sd_qc_gh);
 724                 iput(sdp->sd_sc_inode);
 725                 iput(sdp->sd_qc_inode);
 726         }
 727
 728         gfs2_glock_dq_uninit(&sdp->sd_live_gh);
 729         gfs2_clear_rgrpd(sdp);
 730         gfs2_jindex_free(sdp);
 731         /*  Take apart glock structures and buffer lists  */
 732         gfs2_gl_hash_clear(sdp);
 733         gfs2_delete_debugfs_file(sdp);
 734         /*  Unmount the locking protocol  */
 735         gfs2_lm_unmount(sdp);
 736
 737         /*  At this point, we're through participating in the lockspace  */
 738         gfs2_sys_fs_del(sdp);
 739 }
 740
 741 /**
 742  * gfs2_sync_fs - sync the filesystem
 743  * @sb: the superblock
 744  *
 745  * Flushes the log to disk.
 746  */
 747
 748 static int gfs2_sync_fs(struct super_block *sb, int wait)
 749 {
 750         struct gfs2_sbd *sdp = sb->s_fs_info;
 751
 752         gfs2_quota_sync(sb, -1);
 753         if (wait)
 754                 gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_NORMAL |
 755                                GFS2_LFC_SYNC_FS);
 756         return sdp->sd_log_error;
 757 }
 758
 759 void gfs2_freeze_func(struct work_struct *work)
 760 {
 761         int error;
 762         struct gfs2_holder freeze_gh;
 763         struct gfs2_sbd *sdp = container_of(work, struct gfs2_sbd, sd_freeze_work);
 764         struct super_block *sb = sdp->sd_vfs;
 765
 766         atomic_inc(&sb->s_active);
 767         error = gfs2_glock_nq_init(sdp->sd_freeze_gl, LM_ST_SHARED,
 768                                    LM_FLAG_NOEXP | GL_EXACT, &freeze_gh);
 769         if (error) {
 770                 fs_info(sdp, "GFS2: couldn't get freeze lock : %d\n", error);
 771                 gfs2_assert_withdraw(sdp, 0);
 772         } else {
 773                 atomic_set(&sdp->sd_freeze_state, SFS_UNFROZEN);
 774                 error = thaw_super(sb);
 775                 if (error) {
 776                         fs_info(sdp, "GFS2: couldn't thaw filesystem: %d\n",
 777                                 error);
 778                         gfs2_assert_withdraw(sdp, 0);
 779                 }
 780                 gfs2_glock_dq_uninit(&freeze_gh);
 781         }
 782         deactivate_super(sb);
 783         clear_bit_unlock(SDF_FS_FROZEN, &sdp->sd_flags);
 784         wake_up_bit(&sdp->sd_flags, SDF_FS_FROZEN);
 785         return;
 786 }
 787
 788 /**
 789  * gfs2_freeze - prevent further writes to the filesystem
 790  * @sb: the VFS structure for the filesystem
 791  *
 792  */
 793
 794 static int gfs2_freeze(struct super_block *sb)
 795 {
 796         struct gfs2_sbd *sdp = sb->s_fs_info;
 797         int error = 0;
 798
 799         mutex_lock(&sdp->sd_freeze_mutex);
 800         if (atomic_read(&sdp->sd_freeze_state) != SFS_UNFROZEN)
 801                 goto out;
 802
 803         for (;;) {
 804                 if (gfs2_withdrawn(sdp)) {
 805                         error = -EINVAL;
 806                         goto out;
 807                 }
 808
 809                 error = gfs2_lock_fs_check_clean(sdp);
 810                 if (!error)
 811                         break;
 812
 813                 if (error == -EBUSY)
 814                         fs_err(sdp, "waiting for recovery before freeze\n");
 815                 else if (error == -EIO) {
 816                         fs_err(sdp, "Fatal IO error: cannot freeze gfs2 due "
 817                                "to recovery error.\n");
 818                         goto out;
 819                 } else {
 820                         fs_err(sdp, "error freezing FS: %d\n", error);
 821                 }
 822                 fs_err(sdp, "retrying...\n");
 823                 msleep(1000);
 824         }
 825         set_bit(SDF_FS_FROZEN, &sdp->sd_flags);
 826 out:
 827         mutex_unlock(&sdp->sd_freeze_mutex);
 828         return error;
 829 }
 830
 831 /**
 832  * gfs2_unfreeze - reallow writes to the filesystem
 833  * @sb: the VFS structure for the filesystem
 834  *
 835  */
 836
 837 static int gfs2_unfreeze(struct super_block *sb)
 838 {
 839         struct gfs2_sbd *sdp = sb->s_fs_info;
 840
 841         mutex_lock(&sdp->sd_freeze_mutex);
 842         if (atomic_read(&sdp->sd_freeze_state) != SFS_FROZEN ||
 843             !gfs2_holder_initialized(&sdp->sd_freeze_gh)) {
 844                 mutex_unlock(&sdp->sd_freeze_mutex);
 845                 return 0;
 846         }
 847
 848         gfs2_glock_dq_uninit(&sdp->sd_freeze_gh);
 849         mutex_unlock(&sdp->sd_freeze_mutex);
 850         return wait_on_bit(&sdp->sd_flags, SDF_FS_FROZEN, TASK_INTERRUPTIBLE);
 851 }
 852
 853 /**
 854  * statfs_fill - fill in the sg for a given RG
 855  * @rgd: the RG
 856  * @sc: the sc structure
 857  *
 858  * Returns: 0 on success, -ESTALE if the LVB is invalid
 859  */
 860
 861 static int statfs_slow_fill(struct gfs2_rgrpd *rgd,
 862                             struct gfs2_statfs_change_host *sc)
 863 {
 864         gfs2_rgrp_verify(rgd);
 865         sc->sc_total += rgd->rd_data;
 866         sc->sc_free += rgd->rd_free;
 867         sc->sc_dinodes += rgd->rd_dinodes;
 868         return 0;
 869 }
 870
 871 /**
 872  * gfs2_statfs_slow - Stat a filesystem using asynchronous locking
 873  * @sdp: the filesystem
 874  * @sc: the sc info that will be returned
 875  *
 876  * Any error (other than a signal) will cause this routine to fall back
 877  * to the synchronous version.
 878  *
 879  * FIXME: This really shouldn't busy wait like this.
 880  *
 881  * Returns: errno
 882  */
 883
 884 static int gfs2_statfs_slow(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *sc)
 885 {
 886         struct gfs2_rgrpd *rgd_next;
 887         struct gfs2_holder *gha, *gh;
 888         unsigned int slots = 64;
 889         unsigned int x;
 890         int done;
 891         int error = 0, err;
 892
 893         memset(sc, 0, sizeof(struct gfs2_statfs_change_host));
 894         gha = kmalloc_array(slots, sizeof(struct gfs2_holder), GFP_KERNEL);
 895         if (!gha)
 896                 return -ENOMEM;
 897         for (x = 0; x < slots; x++)
 898                 gfs2_holder_mark_uninitialized(gha + x);
 899
 900         rgd_next = gfs2_rgrpd_get_first(sdp);
 901
 902         for (;;) {
 903                 done = 1;
 904
 905                 for (x = 0; x < slots; x++) {
 906                         gh = gha + x;
 907
 908                         if (gfs2_holder_initialized(gh) && gfs2_glock_poll(gh)) {
 909                                 err = gfs2_glock_wait(gh);
 910                                 if (err) {
 911                                         gfs2_holder_uninit(gh);
 912                                         error = err;
 913                                 } else {
 914                                         if (!error) {
 915                                                 struct gfs2_rgrpd *rgd =
 916                                                         gfs2_glock2rgrp(gh->gh_gl);
 917
 918                                                 error = statfs_slow_fill(rgd, sc);
 919                                         }
 920                                         gfs2_glock_dq_uninit(gh);
 921                                 }
 922                         }
 923
 924                         if (gfs2_holder_initialized(gh))
 925                                 done = 0;
 926                         else if (rgd_next && !error) {
 927                                 error = gfs2_glock_nq_init(rgd_next->rd_gl,
 928                                                            LM_ST_SHARED,
 929                                                            GL_ASYNC,
 930                                                            gh);
 931                                 rgd_next = gfs2_rgrpd_get_next(rgd_next);
 932                                 done = 0;
 933                         }
 934
 935                         if (signal_pending(current))
 936                                 error = -ERESTARTSYS;
 937                 }
 938
 939                 if (done)
 940                         break;
 941
 942                 yield();
 943         }
 944
 945         kfree(gha);
 946         return error;
 947 }
 948
 949 /**
 950  * gfs2_statfs_i - Do a statfs
 951  * @sdp: the filesystem
 952  * @sg: the sg structure
 953  *
 954  * Returns: errno
 955  */
 956
 957 static int gfs2_statfs_i(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *sc)
 958 {
 959         struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
 960         struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
 961
 962         spin_lock(&sdp->sd_statfs_spin);
 963
 964         *sc = *m_sc;
 965         sc->sc_total += l_sc->sc_total;
 966         sc->sc_free += l_sc->sc_free;
 967         sc->sc_dinodes += l_sc->sc_dinodes;
 968
 969         spin_unlock(&sdp->sd_statfs_spin);
 970
 971         if (sc->sc_free < 0)
 972                 sc->sc_free = 0;
 973         if (sc->sc_free > sc->sc_total)
 974                 sc->sc_free = sc->sc_total;
 975         if (sc->sc_dinodes < 0)
 976                 sc->sc_dinodes = 0;
 977
 978         return 0;
 979 }
 980
 981 /**
 982  * gfs2_statfs - Gather and return stats about the filesystem
 983  * @sb: The superblock
 984  * @statfsbuf: The buffer
 985  *
 986  * Returns: 0 on success or error code
 987  */
 988
 989 static int gfs2_statfs(struct dentry *dentry, struct kstatfs *buf)
 990 {
 991         struct super_block *sb = dentry->d_sb;
 992         struct gfs2_sbd *sdp = sb->s_fs_info;
 993         struct gfs2_statfs_change_host sc;
 994         int error;
 995
 996         error = gfs2_rindex_update(sdp);
 997         if (error)
 998                 return error;
 999
1000         if (gfs2_tune_get(sdp, gt_statfs_slow))
1001                 error = gfs2_statfs_slow(sdp, &sc);
1002         else
1003                 error = gfs2_statfs_i(sdp, &sc);
1004
1005         if (error)
1006                 return error;
1007
1008         buf->f_type = GFS2_MAGIC;
1009         buf->f_bsize = sdp->sd_sb.sb_bsize;
1010         buf->f_blocks = sc.sc_total;
1011         buf->f_bfree = sc.sc_free;
1012         buf->f_bavail = sc.sc_free;
1013         buf->f_files = sc.sc_dinodes + sc.sc_free;
1014         buf->f_ffree = sc.sc_free;
1015         buf->f_namelen = GFS2_FNAMESIZE;
1016
1017         return 0;
1018 }
1019
1020 /**
1021  * gfs2_drop_inode - Drop an inode (test for remote unlink)
1022  * @inode: The inode to drop
1023  *
1024  * If we've received a callback on an iopen lock then it's because a
1025  * remote node tried to deallocate the inode but failed due to this node
1026  * still having the inode open. Here we mark the link count zero
1027  * since we know that it must have reached zero if the GLF_DEMOTE flag
1028  * is set on the iopen glock. If we didn't do a disk read since the
1029  * remote node removed the final link then we might otherwise miss
1030  * this event. This check ensures that this node will deallocate the
1031  * inode's blocks, or alternatively pass the baton on to another
1032  * node for later deallocation.
1033  */
1034
1035 static int gfs2_drop_inode(struct inode *inode)
1036 {
1037         struct gfs2_inode *ip = GFS2_I(inode);
1038
1039         if (!test_bit(GIF_FREE_VFS_INODE, &ip->i_flags) &&
1040             inode->i_nlink &&
1041             gfs2_holder_initialized(&ip->i_iopen_gh)) {
1042                 struct gfs2_glock *gl = ip->i_iopen_gh.gh_gl;
1043                 if (test_bit(GLF_DEMOTE, &gl->gl_flags))
1044                         clear_nlink(inode);
1045         }
1046
1047         /*
1048          * When under memory pressure when an inode's link count has dropped to
1049          * zero, defer deleting the inode to the delete workqueue.  This avoids
1050          * calling into DLM under memory pressure, which can deadlock.
1051          */
1052         if (!inode->i_nlink &&
1053             unlikely(current->flags & PF_MEMALLOC) &&
1054             gfs2_holder_initialized(&ip->i_iopen_gh)) {
1055                 struct gfs2_glock *gl = ip->i_iopen_gh.gh_gl;
1056
1057                 gfs2_glock_hold(gl);
1058                 if (!gfs2_queue_delete_work(gl, 0))
1059                         gfs2_glock_queue_put(gl);
1060                 return false;
1061         }
1062
1063         return generic_drop_inode(inode);
1064 }
1065
1066 static int is_ancestor(const struct dentry *d1, const struct dentry *d2)
1067 {
1068         do {
1069                 if (d1 == d2)
1070                         return 1;
1071                 d1 = d1->d_parent;
1072         } while (!IS_ROOT(d1));
1073         return 0;
1074 }
1075
1076 /**
1077  * gfs2_show_options - Show mount options for /proc/mounts
1078  * @s: seq_file structure
1079  * @root: root of this (sub)tree
1080  *
1081  * Returns: 0 on success or error code
1082  */
1083
1084 static int gfs2_show_options(struct seq_file *s, struct dentry *root)
1085 {
1086         struct gfs2_sbd *sdp = root->d_sb->s_fs_info;
1087         struct gfs2_args *args = &sdp->sd_args;
1088         int val;
1089
1090         if (is_ancestor(root, sdp->sd_master_dir))
1091                 seq_puts(s, ",meta");
1092         if (args->ar_lockproto[0])
1093                 seq_show_option(s, "lockproto", args->ar_lockproto);
1094         if (args->ar_locktable[0])
1095                 seq_show_option(s, "locktable", args->ar_locktable);
1096         if (args->ar_hostdata[0])
1097                 seq_show_option(s, "hostdata", args->ar_hostdata);
1098         if (args->ar_spectator)
1099                 seq_puts(s, ",spectator");
1100         if (args->ar_localflocks)
1101                 seq_puts(s, ",localflocks");
1102         if (args->ar_debug)
1103                 seq_puts(s, ",debug");
1104         if (args->ar_posix_acl)
1105                 seq_puts(s, ",acl");
1106         if (args->ar_quota != GFS2_QUOTA_DEFAULT) {
1107                 char *state;
1108                 switch (args->ar_quota) {
1109                 case GFS2_QUOTA_OFF:
1110                         state = "off";
1111                         break;
1112                 case GFS2_QUOTA_ACCOUNT:
1113                         state = "account";
1114                         break;
1115                 case GFS2_QUOTA_ON:
1116                         state = "on";
1117                         break;
1118                 default:
1119                         state = "unknown";
1120                         break;
1121                 }
1122                 seq_printf(s, ",quota=%s", state);
1123         }
1124         if (args->ar_suiddir)
1125                 seq_puts(s, ",suiddir");
1126         if (args->ar_data != GFS2_DATA_DEFAULT) {
1127                 char *state;
1128                 switch (args->ar_data) {
1129                 case GFS2_DATA_WRITEBACK:
1130                         state = "writeback";
1131                         break;
1132                 case GFS2_DATA_ORDERED:
1133                         state = "ordered";
1134                         break;
1135                 default:
1136                         state = "unknown";
1137                         break;
1138                 }
1139                 seq_printf(s, ",data=%s", state);
1140         }
1141         if (args->ar_discard)
1142                 seq_puts(s, ",discard");
1143         val = sdp->sd_tune.gt_logd_secs;
1144         if (val != 30)
1145                 seq_printf(s, ",commit=%d", val);
1146         val = sdp->sd_tune.gt_statfs_quantum;
1147         if (val != 30)
1148                 seq_printf(s, ",statfs_quantum=%d", val);
1149         else if (sdp->sd_tune.gt_statfs_slow)
1150                 seq_puts(s, ",statfs_quantum=0");
1151         val = sdp->sd_tune.gt_quota_quantum;
1152         if (val != 60)
1153                 seq_printf(s, ",quota_quantum=%d", val);
1154         if (args->ar_statfs_percent)
1155                 seq_printf(s, ",statfs_percent=%d", args->ar_statfs_percent);
1156         if (args->ar_errors != GFS2_ERRORS_DEFAULT) {
1157                 const char *state;
1158
1159                 switch (args->ar_errors) {
1160                 case GFS2_ERRORS_WITHDRAW:
1161                         state = "withdraw";
1162                         break;
1163                 case GFS2_ERRORS_PANIC:
1164                         state = "panic";
1165                         break;
1166                 default:
1167                         state = "unknown";
1168                         break;
1169                 }
1170                 seq_printf(s, ",errors=%s", state);
1171         }
1172         if (test_bit(SDF_NOBARRIERS, &sdp->sd_flags))
1173                 seq_puts(s, ",nobarrier");
1174         if (test_bit(SDF_DEMOTE, &sdp->sd_flags))
1175                 seq_puts(s, ",demote_interface_used");
1176         if (args->ar_rgrplvb)
1177                 seq_puts(s, ",rgrplvb");
1178         if (args->ar_loccookie)
1179                 seq_puts(s, ",loccookie");
1180         return 0;
1181 }
1182
1183 static void gfs2_final_release_pages(struct gfs2_inode *ip)
1184 {
1185         struct inode *inode = &ip->i_inode;
1186         struct gfs2_glock *gl = ip->i_gl;
1187
1188         truncate_inode_pages(gfs2_glock2aspace(ip->i_gl), 0);
1189         truncate_inode_pages(&inode->i_data, 0);
1190
1191         if (atomic_read(&gl->gl_revokes) == 0) {
1192                 clear_bit(GLF_LFLUSH, &gl->gl_flags);
1193                 clear_bit(GLF_DIRTY, &gl->gl_flags);
1194         }
1195 }
1196
1197 static int gfs2_dinode_dealloc(struct gfs2_inode *ip)
1198 {
1199         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1200         struct gfs2_rgrpd *rgd;
1201         struct gfs2_holder gh;
1202         int error;
1203
1204         if (gfs2_get_inode_blocks(&ip->i_inode) != 1) {
1205                 gfs2_consist_inode(ip);
1206                 return -EIO;
1207         }
1208
1209         error = gfs2_rindex_update(sdp);
1210         if (error)
1211                 return error;
1212
1213         error = gfs2_quota_hold(ip, NO_UID_QUOTA_CHANGE, NO_GID_QUOTA_CHANGE);
1214         if (error)
1215                 return error;
1216
1217         rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1);
1218         if (!rgd) {
1219                 gfs2_consist_inode(ip);
1220                 error = -EIO;
1221                 goto out_qs;
1222         }
1223
1224         error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &gh);
1225         if (error)
1226                 goto out_qs;
1227
1228         error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS + RES_QUOTA,
1229                                  sdp->sd_jdesc->jd_blocks);
1230         if (error)
1231                 goto out_rg_gunlock;
1232
1233         gfs2_free_di(rgd, ip);
1234
1235         gfs2_final_release_pages(ip);
1236
1237         gfs2_trans_end(sdp);
1238
1239 out_rg_gunlock:
1240         gfs2_glock_dq_uninit(&gh);
1241 out_qs:
1242         gfs2_quota_unhold(ip);
1243         return error;
1244 }
1245
1246 /**
1247  * gfs2_glock_put_eventually
1248  * @gl: The glock to put
1249  *
1250  * When under memory pressure, trigger a deferred glock put to make sure we
1251  * won't call into DLM and deadlock.  Otherwise, put the glock directly.
1252  */
1253
1254 static void gfs2_glock_put_eventually(struct gfs2_glock *gl)
1255 {
1256         if (current->flags & PF_MEMALLOC)
1257                 gfs2_glock_queue_put(gl);
1258         else
1259                 gfs2_glock_put(gl);
1260 }
1261
1262 static bool gfs2_upgrade_iopen_glock(struct inode *inode)
1263 {
1264         struct gfs2_inode *ip = GFS2_I(inode);
1265         struct gfs2_sbd *sdp = GFS2_SB(inode);
1266         struct gfs2_holder *gh = &ip->i_iopen_gh;
1267         long timeout = 5 * HZ;
1268         int error;
1269
1270         gh->gh_flags |= GL_NOCACHE;
1271         gfs2_glock_dq_wait(gh);
1272
1273         /*
1274          * If there are no other lock holders, we'll get the lock immediately.
1275          * Otherwise, the other nodes holding the lock will be notified about
1276          * our locking request.  If they don't have the inode open, they'll
1277          * evict the cached inode and release the lock.  Otherwise, if they
1278          * poke the inode glock, we'll take this as an indication that they
1279          * still need the iopen glock and that they'll take care of deleting
1280          * the inode when they're done.  As a last resort, if another node
1281          * keeps holding the iopen glock without showing any activity on the
1282          * inode glock, we'll eventually time out.
1283          *
1284          * Note that we're passing the LM_FLAG_TRY_1CB flag to the first
1285          * locking request as an optimization to notify lock holders as soon as
1286          * possible.  Without that flag, they'd be notified implicitly by the
1287          * second locking request.
1288          */
1289
1290         gfs2_holder_reinit(LM_ST_EXCLUSIVE, LM_FLAG_TRY_1CB | GL_NOCACHE, gh);
1291         error = gfs2_glock_nq(gh);
1292         if (error != GLR_TRYFAILED)
1293                 return !error;
1294
1295         gfs2_holder_reinit(LM_ST_EXCLUSIVE, GL_ASYNC | GL_NOCACHE, gh);
1296         error = gfs2_glock_nq(gh);
1297         if (error)
1298                 return false;
1299
1300         timeout = wait_event_interruptible_timeout(sdp->sd_async_glock_wait,
1301                 !test_bit(HIF_WAIT, &gh->gh_iflags) ||
1302                 test_bit(GLF_DEMOTE, &ip->i_gl->gl_flags),
1303                 timeout);
1304         if (!test_bit(HIF_HOLDER, &gh->gh_iflags)) {
1305                 gfs2_glock_dq(gh);
1306                 return false;
1307         }
1308         return true;
1309 }
1310
1311 /**
1312  * gfs2_evict_inode - Remove an inode from cache
1313  * @inode: The inode to evict
1314  *
1315  * There are three cases to consider:
1316  * 1. i_nlink == 0, we are final opener (and must deallocate)
1317  * 2. i_nlink == 0, we are not the final opener (and cannot deallocate)
1318  * 3. i_nlink > 0
1319  *
1320  * If the fs is read only, then we have to treat all cases as per #3
1321  * since we are unable to do any deallocation. The inode will be
1322  * deallocated by the next read/write node to attempt an allocation
1323  * in the same resource group
1324  *
1325  * We have to (at the moment) hold the inodes main lock to cover
1326  * the gap between unlocking the shared lock on the iopen lock and
1327  * taking the exclusive lock. I'd rather do a shared -> exclusive
1328  * conversion on the iopen lock, but we can change that later. This
1329  * is safe, just less efficient.
1330  */
1331
1332 static void gfs2_evict_inode(struct inode *inode)
1333 {
1334         struct super_block *sb = inode->i_sb;
1335         struct gfs2_sbd *sdp = sb->s_fs_info;
1336         struct gfs2_inode *ip = GFS2_I(inode);
1337         struct gfs2_holder gh;
1338         struct address_space *metamapping;
1339         int error;
1340
1341         if (test_bit(GIF_FREE_VFS_INODE, &ip->i_flags)) {
1342                 clear_inode(inode);
1343                 return;
1344         }
1345
1346         if (inode->i_nlink || sb_rdonly(sb))
1347                 goto out;
1348
1349         if (test_bit(GIF_ALLOC_FAILED, &ip->i_flags)) {
1350                 BUG_ON(!gfs2_glock_is_locked_by_me(ip->i_gl));
1351                 gfs2_holder_mark_uninitialized(&gh);
1352                 goto out_delete;
1353         }
1354
1355         if (test_bit(GIF_DEFERRED_DELETE, &ip->i_flags))
1356                 goto out;
1357
1358         /* Deletes should never happen under memory pressure anymore.  */
1359         if (WARN_ON_ONCE(current->flags & PF_MEMALLOC))
1360                 goto out;
1361
1362         /* Must not read inode block until block type has been verified */
1363         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, &gh);
1364         if (unlikely(error)) {
1365                 glock_clear_object(ip->i_iopen_gh.gh_gl, ip);
1366                 ip->i_iopen_gh.gh_flags |= GL_NOCACHE;
1367                 gfs2_glock_dq_uninit(&ip->i_iopen_gh);
1368                 goto out;
1369         }
1370
1371         if (gfs2_inode_already_deleted(ip->i_gl, ip->i_no_formal_ino))
1372                 goto out_truncate;
1373         error = gfs2_check_blk_type(sdp, ip->i_no_addr, GFS2_BLKST_UNLINKED);
1374         if (error)
1375                 goto out_truncate;
1376
1377         if (test_bit(GIF_INVALID, &ip->i_flags)) {
1378                 error = gfs2_inode_refresh(ip);
1379                 if (error)
1380                         goto out_truncate;
1381         }
1382
1383         /*
1384          * The inode may have been recreated in the meantime.
1385          */
1386         if (inode->i_nlink)
1387                 goto out_truncate;
1388
1389 out_delete:
1390         if (gfs2_holder_initialized(&ip->i_iopen_gh) &&
1391             test_bit(HIF_HOLDER, &ip->i_iopen_gh.gh_iflags)) {
1392                 if (!gfs2_upgrade_iopen_glock(inode)) {
1393                         gfs2_holder_uninit(&ip->i_iopen_gh);
1394                         goto out_truncate;
1395                 }
1396         }
1397
1398         if (S_ISDIR(inode->i_mode) &&
1399             (ip->i_diskflags & GFS2_DIF_EXHASH)) {
1400                 error = gfs2_dir_exhash_dealloc(ip);
1401                 if (error)
1402                         goto out_unlock;
1403         }
1404
1405         if (ip->i_eattr) {
1406                 error = gfs2_ea_dealloc(ip);
1407                 if (error)
1408                         goto out_unlock;
1409         }
1410
1411         if (!gfs2_is_stuffed(ip)) {
1412                 error = gfs2_file_dealloc(ip);
1413                 if (error)
1414                         goto out_unlock;
1415         }
1416
1417         /* We're about to clear the bitmap for the dinode, but as soon as we
1418            do, gfs2_create_inode can create another inode at the same block
1419            location and try to set gl_object again. We clear gl_object here so
1420            that subsequent inode creates don't see an old gl_object. */
1421         glock_clear_object(ip->i_gl, ip);
1422         error = gfs2_dinode_dealloc(ip);
1423         gfs2_inode_remember_delete(ip->i_gl, ip->i_no_formal_ino);
1424         goto out_unlock;
1425
1426 out_truncate:
1427         gfs2_log_flush(sdp, ip->i_gl, GFS2_LOG_HEAD_FLUSH_NORMAL |
1428                        GFS2_LFC_EVICT_INODE);
1429         metamapping = gfs2_glock2aspace(ip->i_gl);
1430         if (test_bit(GLF_DIRTY, &ip->i_gl->gl_flags)) {
1431                 filemap_fdatawrite(metamapping);
1432                 filemap_fdatawait(metamapping);
1433         }
1434         write_inode_now(inode, 1);
1435         gfs2_ail_flush(ip->i_gl, 0);
1436
1437         error = gfs2_trans_begin(sdp, 0, sdp->sd_jdesc->jd_blocks);
1438         if (error)
1439                 goto out_unlock;
1440         /* Needs to be done before glock release & also in a transaction */
1441         truncate_inode_pages(&inode->i_data, 0);
1442         truncate_inode_pages(metamapping, 0);
1443         gfs2_trans_end(sdp);
1444
1445 out_unlock:
1446         if (gfs2_rs_active(&ip->i_res))
1447                 gfs2_rs_deltree(&ip->i_res);
1448
1449         if (gfs2_holder_initialized(&gh)) {
1450                 glock_clear_object(ip->i_gl, ip);
1451                 gfs2_glock_dq_uninit(&gh);
1452         }
1453         if (error && error != GLR_TRYFAILED && error != -EROFS)
1454                 fs_warn(sdp, "gfs2_evict_inode: %d\n", error);
1455 out:
1456         truncate_inode_pages_final(&inode->i_data);
1457         if (ip->i_qadata)
1458                 gfs2_assert_warn(sdp, ip->i_qadata->qa_ref == 0);
1459         gfs2_rs_delete(ip, NULL);
1460         gfs2_ordered_del_inode(ip);
1461         clear_inode(inode);
1462         gfs2_dir_hash_inval(ip);
1463         if (ip->i_gl) {
1464                 glock_clear_object(ip->i_gl, ip);
1465                 wait_on_bit_io(&ip->i_flags, GIF_GLOP_PENDING, TASK_UNINTERRUPTIBLE);
1466                 gfs2_glock_add_to_lru(ip->i_gl);
1467                 gfs2_glock_put_eventually(ip->i_gl);
1468                 ip->i_gl = NULL;
1469         }
1470         if (gfs2_holder_initialized(&ip->i_iopen_gh)) {
1471                 struct gfs2_glock *gl = ip->i_iopen_gh.gh_gl;
1472
1473                 glock_clear_object(gl, ip);
1474                 if (test_bit(HIF_HOLDER, &ip->i_iopen_gh.gh_iflags)) {
1475                         ip->i_iopen_gh.gh_flags |= GL_NOCACHE;
1476                         gfs2_glock_dq(&ip->i_iopen_gh);
1477                 }
1478                 gfs2_glock_hold(gl);
1479                 gfs2_holder_uninit(&ip->i_iopen_gh);
1480                 gfs2_glock_put_eventually(gl);
1481         }
1482 }
1483
1484 static struct inode *gfs2_alloc_inode(struct super_block *sb)
1485 {
1486         struct gfs2_inode *ip;
1487
1488         ip = kmem_cache_alloc(gfs2_inode_cachep, GFP_KERNEL);
1489         if (!ip)
1490                 return NULL;
1491         ip->i_flags = 0;
1492         ip->i_gl = NULL;
1493         gfs2_holder_mark_uninitialized(&ip->i_iopen_gh);
1494         memset(&ip->i_res, 0, sizeof(ip->i_res));
1495         RB_CLEAR_NODE(&ip->i_res.rs_node);
1496         ip->i_rahead = 0;
1497         return &ip->i_inode;
1498 }
1499
1500 static void gfs2_free_inode(struct inode *inode)
1501 {
1502         kmem_cache_free(gfs2_inode_cachep, GFS2_I(inode));
1503 }
1504
1505 const struct super_operations gfs2_super_ops = {
1506         .alloc_inode            = gfs2_alloc_inode,
1507         .free_inode             = gfs2_free_inode,
1508         .write_inode            = gfs2_write_inode,
1509         .dirty_inode            = gfs2_dirty_inode,
1510         .evict_inode            = gfs2_evict_inode,
1511         .put_super              = gfs2_put_super,
1512         .sync_fs                = gfs2_sync_fs,
1513         .freeze_super           = gfs2_freeze,
1514         .thaw_super             = gfs2_unfreeze,
1515         .statfs                 = gfs2_statfs,
1516         .drop_inode             = gfs2_drop_inode,
1517         .show_options           = gfs2_show_options,
1518 };
1519