fs/gfs2/glops.c

   1 /*
   2  * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
   3  * Copyright (C) 2004-2008 Red Hat, Inc.  All rights reserved.
   4  *
   5  * This copyrighted material is made available to anyone wishing to use,
   6  * modify, copy, or redistribute it subject to the terms and conditions
   7  * of the GNU General Public License version 2.
   8  */
   9
  10 #include <linux/spinlock.h>
  11 #include <linux/completion.h>
  12 #include <linux/buffer_head.h>
  13 #include <linux/gfs2_ondisk.h>
  14 #include <linux/bio.h>
  15 #include <linux/posix_acl.h>
  16
  17 #include "gfs2.h"
  18 #include "incore.h"
  19 #include "bmap.h"
  20 #include "glock.h"
  21 #include "glops.h"
  22 #include "inode.h"
  23 #include "log.h"
  24 #include "meta_io.h"
  25 #include "recovery.h"
  26 #include "rgrp.h"
  27 #include "util.h"
  28 #include "trans.h"
  29 #include "dir.h"
  30
  31 static void gfs2_ail_error(struct gfs2_glock *gl, const struct buffer_head *bh)
  32 {
  33         fs_err(gl->gl_sbd, "AIL buffer %p: blocknr %llu state 0x%08lx mapping %p page state 0x%lx\n",
  34                bh, (unsigned long long)bh->b_blocknr, bh->b_state,
  35                bh->b_page->mapping, bh->b_page->flags);
  36         fs_err(gl->gl_sbd, "AIL glock %u:%llu mapping %p\n",
  37                gl->gl_name.ln_type, gl->gl_name.ln_number,
  38                gfs2_glock2aspace(gl));
  39         gfs2_lm_withdraw(gl->gl_sbd, "AIL error\n");
  40 }
  41
  42 /**
  43  * __gfs2_ail_flush - remove all buffers for a given lock from the AIL
  44  * @gl: the glock
  45  * @fsync: set when called from fsync (not all buffers will be clean)
  46  *
  47  * None of the buffers should be dirty, locked, or pinned.
  48  */
  49
  50 static void __gfs2_ail_flush(struct gfs2_glock *gl, bool fsync)
  51 {
  52         struct gfs2_sbd *sdp = gl->gl_sbd;
  53         struct list_head *head = &gl->gl_ail_list;
  54         struct gfs2_bufdata *bd, *tmp;
  55         struct buffer_head *bh;
  56         const unsigned long b_state = (1UL << BH_Dirty)|(1UL << BH_Pinned)|(1UL << BH_Lock);
  57         sector_t blocknr;
  58
  59         gfs2_log_lock(sdp);
  60         spin_lock(&sdp->sd_ail_lock);
  61         list_for_each_entry_safe(bd, tmp, head, bd_ail_gl_list) {
  62                 bh = bd->bd_bh;
  63                 if (bh->b_state & b_state) {
  64                         if (fsync)
  65                                 continue;
  66                         gfs2_ail_error(gl, bh);
  67                 }
  68                 blocknr = bh->b_blocknr;
  69                 bh->b_private = NULL;
  70                 gfs2_remove_from_ail(bd); /* drops ref on bh */
  71
  72                 bd->bd_bh = NULL;
  73                 bd->bd_blkno = blocknr;
  74
  75                 gfs2_trans_add_revoke(sdp, bd);
  76         }
  77         BUG_ON(!fsync && atomic_read(&gl->gl_ail_count));
  78         spin_unlock(&sdp->sd_ail_lock);
  79         gfs2_log_unlock(sdp);
  80 }
  81
  82
  83 static void gfs2_ail_empty_gl(struct gfs2_glock *gl)
  84 {
  85         struct gfs2_sbd *sdp = gl->gl_sbd;
  86         struct gfs2_trans tr;
  87
  88         memset(&tr, 0, sizeof(tr));
  89         tr.tr_revokes = atomic_read(&gl->gl_ail_count);
  90
  91         if (!tr.tr_revokes)
  92                 return;
  93
  94         /* A shortened, inline version of gfs2_trans_begin() */
  95         tr.tr_reserved = 1 + gfs2_struct2blk(sdp, tr.tr_revokes, sizeof(u64));
  96         tr.tr_ip = (unsigned long)__builtin_return_address(0);
  97         INIT_LIST_HEAD(&tr.tr_list_buf);
  98         gfs2_log_reserve(sdp, tr.tr_reserved);
  99         BUG_ON(current->journal_info);
 100         current->journal_info = &tr;
 101
 102         __gfs2_ail_flush(gl, 0);
 103
 104         gfs2_trans_end(sdp);
 105         gfs2_log_flush(sdp, NULL);
 106 }
 107
 108 void gfs2_ail_flush(struct gfs2_glock *gl, bool fsync)
 109 {
 110         struct gfs2_sbd *sdp = gl->gl_sbd;
 111         unsigned int revokes = atomic_read(&gl->gl_ail_count);
 112         int ret;
 113
 114         if (!revokes)
 115                 return;
 116
 117         ret = gfs2_trans_begin(sdp, 0, revokes);
 118         if (ret)
 119                 return;
 120         __gfs2_ail_flush(gl, fsync);
 121         gfs2_trans_end(sdp);
 122         gfs2_log_flush(sdp, NULL);
 123 }
 124
 125 /**
 126  * rgrp_go_sync - sync out the metadata for this glock
 127  * @gl: the glock
 128  *
 129  * Called when demoting or unlocking an EX glock.  We must flush
 130  * to disk all dirty buffers/pages relating to this glock, and must not
 131  * not return to caller to demote/unlock the glock until I/O is complete.
 132  */
 133
 134 static void rgrp_go_sync(struct gfs2_glock *gl)
 135 {
 136         struct address_space *metamapping = gfs2_glock2aspace(gl);
 137         struct gfs2_rgrpd *rgd;
 138         int error;
 139
 140         if (!test_and_clear_bit(GLF_DIRTY, &gl->gl_flags))
 141                 return;
 142         BUG_ON(gl->gl_state != LM_ST_EXCLUSIVE);
 143
 144         gfs2_log_flush(gl->gl_sbd, gl);
 145         filemap_fdatawrite(metamapping);
 146         error = filemap_fdatawait(metamapping);
 147         mapping_set_error(metamapping, error);
 148         gfs2_ail_empty_gl(gl);
 149
 150         spin_lock(&gl->gl_spin);
 151         rgd = gl->gl_object;
 152         if (rgd)
 153                 gfs2_free_clones(rgd);
 154         spin_unlock(&gl->gl_spin);
 155 }
 156
 157 /**
 158  * rgrp_go_inval - invalidate the metadata for this glock
 159  * @gl: the glock
 160  * @flags:
 161  *
 162  * We never used LM_ST_DEFERRED with resource groups, so that we
 163  * should always see the metadata flag set here.
 164  *
 165  */
 166
 167 static void rgrp_go_inval(struct gfs2_glock *gl, int flags)
 168 {
 169         struct address_space *mapping = gfs2_glock2aspace(gl);
 170
 171         BUG_ON(!(flags & DIO_METADATA));
 172         gfs2_assert_withdraw(gl->gl_sbd, !atomic_read(&gl->gl_ail_count));
 173         truncate_inode_pages(mapping, 0);
 174
 175         if (gl->gl_object) {
 176                 struct gfs2_rgrpd *rgd = (struct gfs2_rgrpd *)gl->gl_object;
 177                 rgd->rd_flags &= ~GFS2_RDF_UPTODATE;
 178         }
 179 }
 180
 181 /**
 182  * inode_go_sync - Sync the dirty data and/or metadata for an inode glock
 183  * @gl: the glock protecting the inode
 184  *
 185  */
 186
 187 static void inode_go_sync(struct gfs2_glock *gl)
 188 {
 189         struct gfs2_inode *ip = gl->gl_object;
 190         struct address_space *metamapping = gfs2_glock2aspace(gl);
 191         int error;
 192
 193         if (ip && !S_ISREG(ip->i_inode.i_mode))
 194                 ip = NULL;
 195         if (ip && test_and_clear_bit(GIF_SW_PAGED, &ip->i_flags))
 196                 unmap_shared_mapping_range(ip->i_inode.i_mapping, 0, 0);
 197         if (!test_and_clear_bit(GLF_DIRTY, &gl->gl_flags))
 198                 return;
 199
 200         BUG_ON(gl->gl_state != LM_ST_EXCLUSIVE);
 201
 202         gfs2_log_flush(gl->gl_sbd, gl);
 203         filemap_fdatawrite(metamapping);
 204         if (ip) {
 205                 struct address_space *mapping = ip->i_inode.i_mapping;
 206                 filemap_fdatawrite(mapping);
 207                 error = filemap_fdatawait(mapping);
 208                 mapping_set_error(mapping, error);
 209         }
 210         error = filemap_fdatawait(metamapping);
 211         mapping_set_error(metamapping, error);
 212         gfs2_ail_empty_gl(gl);
 213         /*
 214          * Writeback of the data mapping may cause the dirty flag to be set
 215          * so we have to clear it again here.
 216          */
 217         smp_mb__before_clear_bit();
 218         clear_bit(GLF_DIRTY, &gl->gl_flags);
 219 }
 220
 221 /**
 222  * inode_go_inval - prepare a inode glock to be released
 223  * @gl: the glock
 224  * @flags:
 225  *
 226  * Normally we invlidate everything, but if we are moving into
 227  * LM_ST_DEFERRED from LM_ST_SHARED or LM_ST_EXCLUSIVE then we
 228  * can keep hold of the metadata, since it won't have changed.
 229  *
 230  */
 231
 232 static void inode_go_inval(struct gfs2_glock *gl, int flags)
 233 {
 234         struct gfs2_inode *ip = gl->gl_object;
 235
 236         gfs2_assert_withdraw(gl->gl_sbd, !atomic_read(&gl->gl_ail_count));
 237
 238         if (flags & DIO_METADATA) {
 239                 struct address_space *mapping = gfs2_glock2aspace(gl);
 240                 truncate_inode_pages(mapping, 0);
 241                 if (ip) {
 242                         set_bit(GIF_INVALID, &ip->i_flags);
 243                         forget_all_cached_acls(&ip->i_inode);
 244                         gfs2_dir_hash_inval(ip);
 245                 }
 246         }
 247
 248         if (ip == GFS2_I(gl->gl_sbd->sd_rindex)) {
 249                 gfs2_log_flush(gl->gl_sbd, NULL);
 250                 gl->gl_sbd->sd_rindex_uptodate = 0;
 251         }
 252         if (ip && S_ISREG(ip->i_inode.i_mode))
 253                 truncate_inode_pages(ip->i_inode.i_mapping, 0);
 254 }
 255
 256 /**
 257  * inode_go_demote_ok - Check to see if it's ok to unlock an inode glock
 258  * @gl: the glock
 259  *
 260  * Returns: 1 if it's ok
 261  */
 262
 263 static int inode_go_demote_ok(const struct gfs2_glock *gl)
 264 {
 265         struct gfs2_sbd *sdp = gl->gl_sbd;
 266         struct gfs2_holder *gh;
 267
 268         if (sdp->sd_jindex == gl->gl_object || sdp->sd_rindex == gl->gl_object)
 269                 return 0;
 270
 271         if (!list_empty(&gl->gl_holders)) {
 272                 gh = list_entry(gl->gl_holders.next, struct gfs2_holder, gh_list);
 273                 if (gh->gh_list.next != &gl->gl_holders)
 274                         return 0;
 275         }
 276
 277         return 1;
 278 }
 279
 280 /**
 281  * gfs2_set_nlink - Set the inode's link count based on on-disk info
 282  * @inode: The inode in question
 283  * @nlink: The link count
 284  *
 285  * If the link count has hit zero, it must never be raised, whatever the
 286  * on-disk inode might say. When new struct inodes are created the link
 287  * count is set to 1, so that we can safely use this test even when reading
 288  * in on disk information for the first time.
 289  */
 290
 291 static void gfs2_set_nlink(struct inode *inode, u32 nlink)
 292 {
 293         /*
 294          * We will need to review setting the nlink count here in the
 295          * light of the forthcoming ro bind mount work. This is a reminder
 296          * to do that.
 297          */
 298         if ((inode->i_nlink != nlink) && (inode->i_nlink != 0)) {
 299                 if (nlink == 0)
 300                         clear_nlink(inode);
 301                 else
 302                         set_nlink(inode, nlink);
 303         }
 304 }
 305
 306 static int gfs2_dinode_in(struct gfs2_inode *ip, const void *buf)
 307 {
 308         const struct gfs2_dinode *str = buf;
 309         struct timespec atime;
 310         u16 height, depth;
 311
 312         if (unlikely(ip->i_no_addr != be64_to_cpu(str->di_num.no_addr)))
 313                 goto corrupt;
 314         ip->i_no_formal_ino = be64_to_cpu(str->di_num.no_formal_ino);
 315         ip->i_inode.i_mode = be32_to_cpu(str->di_mode);
 316         ip->i_inode.i_rdev = 0;
 317         switch (ip->i_inode.i_mode & S_IFMT) {
 318         case S_IFBLK:
 319         case S_IFCHR:
 320                 ip->i_inode.i_rdev = MKDEV(be32_to_cpu(str->di_major),
 321                                            be32_to_cpu(str->di_minor));
 322                 break;
 323         };
 324
 325         ip->i_inode.i_uid = be32_to_cpu(str->di_uid);
 326         ip->i_inode.i_gid = be32_to_cpu(str->di_gid);
 327         gfs2_set_nlink(&ip->i_inode, be32_to_cpu(str->di_nlink));
 328         i_size_write(&ip->i_inode, be64_to_cpu(str->di_size));
 329         gfs2_set_inode_blocks(&ip->i_inode, be64_to_cpu(str->di_blocks));
 330         atime.tv_sec = be64_to_cpu(str->di_atime);
 331         atime.tv_nsec = be32_to_cpu(str->di_atime_nsec);
 332         if (timespec_compare(&ip->i_inode.i_atime, &atime) < 0)
 333                 ip->i_inode.i_atime = atime;
 334         ip->i_inode.i_mtime.tv_sec = be64_to_cpu(str->di_mtime);
 335         ip->i_inode.i_mtime.tv_nsec = be32_to_cpu(str->di_mtime_nsec);
 336         ip->i_inode.i_ctime.tv_sec = be64_to_cpu(str->di_ctime);
 337         ip->i_inode.i_ctime.tv_nsec = be32_to_cpu(str->di_ctime_nsec);
 338
 339         ip->i_goal = be64_to_cpu(str->di_goal_meta);
 340         ip->i_generation = be64_to_cpu(str->di_generation);
 341
 342         ip->i_diskflags = be32_to_cpu(str->di_flags);
 343         ip->i_eattr = be64_to_cpu(str->di_eattr);
 344         /* i_diskflags and i_eattr must be set before gfs2_set_inode_flags() */
 345         gfs2_set_inode_flags(&ip->i_inode);
 346         height = be16_to_cpu(str->di_height);
 347         if (unlikely(height > GFS2_MAX_META_HEIGHT))
 348                 goto corrupt;
 349         ip->i_height = (u8)height;
 350
 351         depth = be16_to_cpu(str->di_depth);
 352         if (unlikely(depth > GFS2_DIR_MAX_DEPTH))
 353                 goto corrupt;
 354         ip->i_depth = (u8)depth;
 355         ip->i_entries = be32_to_cpu(str->di_entries);
 356
 357         if (S_ISREG(ip->i_inode.i_mode))
 358                 gfs2_set_aops(&ip->i_inode);
 359
 360         return 0;
 361 corrupt:
 362         gfs2_consist_inode(ip);
 363         return -EIO;
 364 }
 365
 366 /**
 367  * gfs2_inode_refresh - Refresh the incore copy of the dinode
 368  * @ip: The GFS2 inode
 369  *
 370  * Returns: errno
 371  */
 372
 373 int gfs2_inode_refresh(struct gfs2_inode *ip)
 374 {
 375         struct buffer_head *dibh;
 376         int error;
 377
 378         error = gfs2_meta_inode_buffer(ip, &dibh);
 379         if (error)
 380                 return error;
 381
 382         if (gfs2_metatype_check(GFS2_SB(&ip->i_inode), dibh, GFS2_METATYPE_DI)) {
 383                 brelse(dibh);
 384                 return -EIO;
 385         }
 386
 387         error = gfs2_dinode_in(ip, dibh->b_data);
 388         brelse(dibh);
 389         clear_bit(GIF_INVALID, &ip->i_flags);
 390
 391         return error;
 392 }
 393
 394 /**
 395  * inode_go_lock - operation done after an inode lock is locked by a process
 396  * @gl: the glock
 397  * @flags:
 398  *
 399  * Returns: errno
 400  */
 401
 402 static int inode_go_lock(struct gfs2_holder *gh)
 403 {
 404         struct gfs2_glock *gl = gh->gh_gl;
 405         struct gfs2_sbd *sdp = gl->gl_sbd;
 406         struct gfs2_inode *ip = gl->gl_object;
 407         int error = 0;
 408
 409         if (!ip || (gh->gh_flags & GL_SKIP))
 410                 return 0;
 411
 412         if (test_bit(GIF_INVALID, &ip->i_flags)) {
 413                 error = gfs2_inode_refresh(ip);
 414                 if (error)
 415                         return error;
 416         }
 417
 418         if ((ip->i_diskflags & GFS2_DIF_TRUNC_IN_PROG) &&
 419             (gl->gl_state == LM_ST_EXCLUSIVE) &&
 420             (gh->gh_state == LM_ST_EXCLUSIVE)) {
 421                 spin_lock(&sdp->sd_trunc_lock);
 422                 if (list_empty(&ip->i_trunc_list))
 423                         list_add(&sdp->sd_trunc_list, &ip->i_trunc_list);
 424                 spin_unlock(&sdp->sd_trunc_lock);
 425                 wake_up(&sdp->sd_quota_wait);
 426                 return 1;
 427         }
 428
 429         return error;
 430 }
 431
 432 /**
 433  * inode_go_dump - print information about an inode
 434  * @seq: The iterator
 435  * @ip: the inode
 436  *
 437  * Returns: 0 on success, -ENOBUFS when we run out of space
 438  */
 439
 440 static int inode_go_dump(struct seq_file *seq, const struct gfs2_glock *gl)
 441 {
 442         const struct gfs2_inode *ip = gl->gl_object;
 443         if (ip == NULL)
 444                 return 0;
 445         gfs2_print_dbg(seq, " I: n:%llu/%llu t:%u f:0x%02lx d:0x%08x s:%llu\n",
 446                   (unsigned long long)ip->i_no_formal_ino,
 447                   (unsigned long long)ip->i_no_addr,
 448                   IF2DT(ip->i_inode.i_mode), ip->i_flags,
 449                   (unsigned int)ip->i_diskflags,
 450                   (unsigned long long)i_size_read(&ip->i_inode));
 451         return 0;
 452 }
 453
 454 /**
 455  * trans_go_sync - promote/demote the transaction glock
 456  * @gl: the glock
 457  * @state: the requested state
 458  * @flags:
 459  *
 460  */
 461
 462 static void trans_go_sync(struct gfs2_glock *gl)
 463 {
 464         struct gfs2_sbd *sdp = gl->gl_sbd;
 465
 466         if (gl->gl_state != LM_ST_UNLOCKED &&
 467             test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
 468                 gfs2_meta_syncfs(sdp);
 469                 gfs2_log_shutdown(sdp);
 470         }
 471 }
 472
 473 /**
 474  * trans_go_xmote_bh - After promoting/demoting the transaction glock
 475  * @gl: the glock
 476  *
 477  */
 478
 479 static int trans_go_xmote_bh(struct gfs2_glock *gl, struct gfs2_holder *gh)
 480 {
 481         struct gfs2_sbd *sdp = gl->gl_sbd;
 482         struct gfs2_inode *ip = GFS2_I(sdp->sd_jdesc->jd_inode);
 483         struct gfs2_glock *j_gl = ip->i_gl;
 484         struct gfs2_log_header_host head;
 485         int error;
 486
 487         if (test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
 488                 j_gl->gl_ops->go_inval(j_gl, DIO_METADATA);
 489
 490                 error = gfs2_find_jhead(sdp->sd_jdesc, &head);
 491                 if (error)
 492                         gfs2_consist(sdp);
 493                 if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT))
 494                         gfs2_consist(sdp);
 495
 496                 /*  Initialize some head of the log stuff  */
 497                 if (!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) {
 498                         sdp->sd_log_sequence = head.lh_sequence + 1;
 499                         gfs2_log_pointers_init(sdp, head.lh_blkno);
 500                 }
 501         }
 502         return 0;
 503 }
 504
 505 /**
 506  * trans_go_demote_ok
 507  * @gl: the glock
 508  *
 509  * Always returns 0
 510  */
 511
 512 static int trans_go_demote_ok(const struct gfs2_glock *gl)
 513 {
 514         return 0;
 515 }
 516
 517 /**
 518  * iopen_go_callback - schedule the dcache entry for the inode to be deleted
 519  * @gl: the glock
 520  *
 521  * gl_spin lock is held while calling this
 522  */
 523 static void iopen_go_callback(struct gfs2_glock *gl)
 524 {
 525         struct gfs2_inode *ip = (struct gfs2_inode *)gl->gl_object;
 526         struct gfs2_sbd *sdp = gl->gl_sbd;
 527
 528         if (sdp->sd_vfs->s_flags & MS_RDONLY)
 529                 return;
 530
 531         if (gl->gl_demote_state == LM_ST_UNLOCKED &&
 532             gl->gl_state == LM_ST_SHARED && ip) {
 533                 gfs2_glock_hold(gl);
 534                 if (queue_work(gfs2_delete_workqueue, &gl->gl_delete) == 0)
 535                         gfs2_glock_put_nolock(gl);
 536         }
 537 }
 538
 539 const struct gfs2_glock_operations gfs2_meta_glops = {
 540         .go_type = LM_TYPE_META,
 541 };
 542
 543 const struct gfs2_glock_operations gfs2_inode_glops = {
 544         .go_xmote_th = inode_go_sync,
 545         .go_inval = inode_go_inval,
 546         .go_demote_ok = inode_go_demote_ok,
 547         .go_lock = inode_go_lock,
 548         .go_dump = inode_go_dump,
 549         .go_type = LM_TYPE_INODE,
 550         .go_flags = GLOF_ASPACE,
 551 };
 552
 553 const struct gfs2_glock_operations gfs2_rgrp_glops = {
 554         .go_xmote_th = rgrp_go_sync,
 555         .go_inval = rgrp_go_inval,
 556         .go_lock = gfs2_rgrp_go_lock,
 557         .go_unlock = gfs2_rgrp_go_unlock,
 558         .go_dump = gfs2_rgrp_dump,
 559         .go_type = LM_TYPE_RGRP,
 560         .go_flags = GLOF_ASPACE,
 561 };
 562
 563 const struct gfs2_glock_operations gfs2_trans_glops = {
 564         .go_xmote_th = trans_go_sync,
 565         .go_xmote_bh = trans_go_xmote_bh,
 566         .go_demote_ok = trans_go_demote_ok,
 567         .go_type = LM_TYPE_NONDISK,
 568 };
 569
 570 const struct gfs2_glock_operations gfs2_iopen_glops = {
 571         .go_type = LM_TYPE_IOPEN,
 572         .go_callback = iopen_go_callback,
 573 };
 574
 575 const struct gfs2_glock_operations gfs2_flock_glops = {
 576         .go_type = LM_TYPE_FLOCK,
 577 };
 578
 579 const struct gfs2_glock_operations gfs2_nondisk_glops = {
 580         .go_type = LM_TYPE_NONDISK,
 581 };
 582
 583 const struct gfs2_glock_operations gfs2_quota_glops = {
 584         .go_type = LM_TYPE_QUOTA,
 585 };
 586
 587 const struct gfs2_glock_operations gfs2_journal_glops = {
 588         .go_type = LM_TYPE_JOURNAL,
 589 };
 590
 591 const struct gfs2_glock_operations *gfs2_glops_list[] = {
 592         [LM_TYPE_META] = &gfs2_meta_glops,
 593         [LM_TYPE_INODE] = &gfs2_inode_glops,
 594         [LM_TYPE_RGRP] = &gfs2_rgrp_glops,
 595         [LM_TYPE_IOPEN] = &gfs2_iopen_glops,
 596         [LM_TYPE_FLOCK] = &gfs2_flock_glops,
 597         [LM_TYPE_NONDISK] = &gfs2_nondisk_glops,
 598         [LM_TYPE_QUOTA] = &gfs2_quota_glops,
 599         [LM_TYPE_JOURNAL] = &gfs2_journal_glops,
 600 };
 601