fs/gfs2/glops.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
   4  * Copyright (C) 2004-2008 Red Hat, Inc.  All rights reserved.
   5  */
   6
   7 #include <linux/spinlock.h>
   8 #include <linux/completion.h>
   9 #include <linux/buffer_head.h>
  10 #include <linux/gfs2_ondisk.h>
  11 #include <linux/bio.h>
  12 #include <linux/posix_acl.h>
  13 #include <linux/security.h>
  14
  15 #include "gfs2.h"
  16 #include "incore.h"
  17 #include "bmap.h"
  18 #include "glock.h"
  19 #include "glops.h"
  20 #include "inode.h"
  21 #include "log.h"
  22 #include "meta_io.h"
  23 #include "recovery.h"
  24 #include "rgrp.h"
  25 #include "util.h"
  26 #include "trans.h"
  27 #include "dir.h"
  28 #include "lops.h"
  29
  30 struct workqueue_struct *gfs2_freeze_wq;
  31
  32 extern struct workqueue_struct *gfs2_control_wq;
  33
  34 static void gfs2_ail_error(struct gfs2_glock *gl, const struct buffer_head *bh)
  35 {
  36         fs_err(gl->gl_name.ln_sbd,
  37                "AIL buffer %p: blocknr %llu state 0x%08lx mapping %p page "
  38                "state 0x%lx\n",
  39                bh, (unsigned long long)bh->b_blocknr, bh->b_state,
  40                bh->b_page->mapping, bh->b_page->flags);
  41         fs_err(gl->gl_name.ln_sbd, "AIL glock %u:%llu mapping %p\n",
  42                gl->gl_name.ln_type, gl->gl_name.ln_number,
  43                gfs2_glock2aspace(gl));
  44         gfs2_lm(gl->gl_name.ln_sbd, "AIL error\n");
  45         gfs2_withdraw(gl->gl_name.ln_sbd);
  46 }
  47
  48 /**
  49  * __gfs2_ail_flush - remove all buffers for a given lock from the AIL
  50  * @gl: the glock
  51  * @fsync: set when called from fsync (not all buffers will be clean)
  52  *
  53  * None of the buffers should be dirty, locked, or pinned.
  54  */
  55
  56 static void __gfs2_ail_flush(struct gfs2_glock *gl, bool fsync,
  57                              unsigned int nr_revokes)
  58 {
  59         struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
  60         struct list_head *head = &gl->gl_ail_list;
  61         struct gfs2_bufdata *bd, *tmp;
  62         struct buffer_head *bh;
  63         const unsigned long b_state = (1UL << BH_Dirty)|(1UL << BH_Pinned)|(1UL << BH_Lock);
  64
  65         gfs2_log_lock(sdp);
  66         spin_lock(&sdp->sd_ail_lock);
  67         list_for_each_entry_safe_reverse(bd, tmp, head, bd_ail_gl_list) {
  68                 if (nr_revokes == 0)
  69                         break;
  70                 bh = bd->bd_bh;
  71                 if (bh->b_state & b_state) {
  72                         if (fsync)
  73                                 continue;
  74                         gfs2_ail_error(gl, bh);
  75                 }
  76                 gfs2_trans_add_revoke(sdp, bd);
  77                 nr_revokes--;
  78         }
  79         GLOCK_BUG_ON(gl, !fsync && atomic_read(&gl->gl_ail_count));
  80         spin_unlock(&sdp->sd_ail_lock);
  81         gfs2_log_unlock(sdp);
  82 }
  83
  84
  85 static int gfs2_ail_empty_gl(struct gfs2_glock *gl)
  86 {
  87         struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
  88         struct gfs2_trans tr;
  89         int ret;
  90
  91         memset(&tr, 0, sizeof(tr));
  92         INIT_LIST_HEAD(&tr.tr_buf);
  93         INIT_LIST_HEAD(&tr.tr_databuf);
  94         INIT_LIST_HEAD(&tr.tr_ail1_list);
  95         INIT_LIST_HEAD(&tr.tr_ail2_list);
  96         tr.tr_revokes = atomic_read(&gl->gl_ail_count);
  97
  98         if (!tr.tr_revokes) {
  99                 bool have_revokes;
 100                 bool log_in_flight;
 101
 102                 /*
 103                  * We have nothing on the ail, but there could be revokes on
 104                  * the sdp revoke queue, in which case, we still want to flush
 105                  * the log and wait for it to finish.
 106                  *
 107                  * If the sdp revoke list is empty too, we might still have an
 108                  * io outstanding for writing revokes, so we should wait for
 109                  * it before returning.
 110                  *
 111                  * If none of these conditions are true, our revokes are all
 112                  * flushed and we can return.
 113                  */
 114                 gfs2_log_lock(sdp);
 115                 have_revokes = !list_empty(&sdp->sd_log_revokes);
 116                 log_in_flight = atomic_read(&sdp->sd_log_in_flight);
 117                 gfs2_log_unlock(sdp);
 118                 if (have_revokes)
 119                         goto flush;
 120                 if (log_in_flight)
 121                         log_flush_wait(sdp);
 122                 return 0;
 123         }
 124
 125         /* A shortened, inline version of gfs2_trans_begin()
 126          * tr->alloced is not set since the transaction structure is
 127          * on the stack */
 128         tr.tr_reserved = 1 + gfs2_struct2blk(sdp, tr.tr_revokes);
 129         tr.tr_ip = _RET_IP_;
 130         ret = gfs2_log_reserve(sdp, tr.tr_reserved);
 131         if (ret < 0)
 132                 return ret;
 133         WARN_ON_ONCE(current->journal_info);
 134         current->journal_info = &tr;
 135
 136         __gfs2_ail_flush(gl, 0, tr.tr_revokes);
 137
 138         gfs2_trans_end(sdp);
 139 flush:
 140         gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_NORMAL |
 141                        GFS2_LFC_AIL_EMPTY_GL);
 142         return 0;
 143 }
 144
 145 void gfs2_ail_flush(struct gfs2_glock *gl, bool fsync)
 146 {
 147         struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
 148         unsigned int revokes = atomic_read(&gl->gl_ail_count);
 149         unsigned int max_revokes = (sdp->sd_sb.sb_bsize - sizeof(struct gfs2_log_descriptor)) / sizeof(u64);
 150         int ret;
 151
 152         if (!revokes)
 153                 return;
 154
 155         while (revokes > max_revokes)
 156                 max_revokes += (sdp->sd_sb.sb_bsize - sizeof(struct gfs2_meta_header)) / sizeof(u64);
 157
 158         ret = gfs2_trans_begin(sdp, 0, max_revokes);
 159         if (ret)
 160                 return;
 161         __gfs2_ail_flush(gl, fsync, max_revokes);
 162         gfs2_trans_end(sdp);
 163         gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_NORMAL |
 164                        GFS2_LFC_AIL_FLUSH);
 165 }
 166
 167 /**
 168  * rgrp_go_sync - sync out the metadata for this glock
 169  * @gl: the glock
 170  *
 171  * Called when demoting or unlocking an EX glock.  We must flush
 172  * to disk all dirty buffers/pages relating to this glock, and must not
 173  * return to caller to demote/unlock the glock until I/O is complete.
 174  */
 175
 176 static int rgrp_go_sync(struct gfs2_glock *gl)
 177 {
 178         struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
 179         struct address_space *mapping = &sdp->sd_aspace;
 180         struct gfs2_rgrpd *rgd = gfs2_glock2rgrp(gl);
 181         int error;
 182
 183         if (!test_and_clear_bit(GLF_DIRTY, &gl->gl_flags))
 184                 return 0;
 185         GLOCK_BUG_ON(gl, gl->gl_state != LM_ST_EXCLUSIVE);
 186
 187         gfs2_log_flush(sdp, gl, GFS2_LOG_HEAD_FLUSH_NORMAL |
 188                        GFS2_LFC_RGRP_GO_SYNC);
 189         filemap_fdatawrite_range(mapping, gl->gl_vm.start, gl->gl_vm.end);
 190         error = filemap_fdatawait_range(mapping, gl->gl_vm.start, gl->gl_vm.end);
 191         WARN_ON_ONCE(error);
 192         mapping_set_error(mapping, error);
 193         if (!error)
 194                 error = gfs2_ail_empty_gl(gl);
 195
 196         spin_lock(&gl->gl_lockref.lock);
 197         rgd = gl->gl_object;
 198         if (rgd)
 199                 gfs2_free_clones(rgd);
 200         spin_unlock(&gl->gl_lockref.lock);
 201         return error;
 202 }
 203
 204 /**
 205  * rgrp_go_inval - invalidate the metadata for this glock
 206  * @gl: the glock
 207  * @flags:
 208  *
 209  * We never used LM_ST_DEFERRED with resource groups, so that we
 210  * should always see the metadata flag set here.
 211  *
 212  */
 213
 214 static void rgrp_go_inval(struct gfs2_glock *gl, int flags)
 215 {
 216         struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
 217         struct address_space *mapping = &sdp->sd_aspace;
 218         struct gfs2_rgrpd *rgd = gfs2_glock2rgrp(gl);
 219
 220         if (rgd)
 221                 gfs2_rgrp_brelse(rgd);
 222
 223         WARN_ON_ONCE(!(flags & DIO_METADATA));
 224         truncate_inode_pages_range(mapping, gl->gl_vm.start, gl->gl_vm.end);
 225
 226         if (rgd)
 227                 rgd->rd_flags &= ~GFS2_RDF_UPTODATE;
 228 }
 229
 230 static struct gfs2_inode *gfs2_glock2inode(struct gfs2_glock *gl)
 231 {
 232         struct gfs2_inode *ip;
 233
 234         spin_lock(&gl->gl_lockref.lock);
 235         ip = gl->gl_object;
 236         if (ip)
 237                 set_bit(GIF_GLOP_PENDING, &ip->i_flags);
 238         spin_unlock(&gl->gl_lockref.lock);
 239         return ip;
 240 }
 241
 242 struct gfs2_rgrpd *gfs2_glock2rgrp(struct gfs2_glock *gl)
 243 {
 244         struct gfs2_rgrpd *rgd;
 245
 246         spin_lock(&gl->gl_lockref.lock);
 247         rgd = gl->gl_object;
 248         spin_unlock(&gl->gl_lockref.lock);
 249
 250         return rgd;
 251 }
 252
 253 static void gfs2_clear_glop_pending(struct gfs2_inode *ip)
 254 {
 255         if (!ip)
 256                 return;
 257
 258         clear_bit_unlock(GIF_GLOP_PENDING, &ip->i_flags);
 259         wake_up_bit(&ip->i_flags, GIF_GLOP_PENDING);
 260 }
 261
 262 /**
 263  * inode_go_sync - Sync the dirty data and/or metadata for an inode glock
 264  * @gl: the glock protecting the inode
 265  *
 266  */
 267
 268 static int inode_go_sync(struct gfs2_glock *gl)
 269 {
 270         struct gfs2_inode *ip = gfs2_glock2inode(gl);
 271         int isreg = ip && S_ISREG(ip->i_inode.i_mode);
 272         struct address_space *metamapping = gfs2_glock2aspace(gl);
 273         int error = 0, ret;
 274
 275         if (isreg) {
 276                 if (test_and_clear_bit(GIF_SW_PAGED, &ip->i_flags))
 277                         unmap_shared_mapping_range(ip->i_inode.i_mapping, 0, 0);
 278                 inode_dio_wait(&ip->i_inode);
 279         }
 280         if (!test_and_clear_bit(GLF_DIRTY, &gl->gl_flags))
 281                 goto out;
 282
 283         GLOCK_BUG_ON(gl, gl->gl_state != LM_ST_EXCLUSIVE);
 284
 285         gfs2_log_flush(gl->gl_name.ln_sbd, gl, GFS2_LOG_HEAD_FLUSH_NORMAL |
 286                        GFS2_LFC_INODE_GO_SYNC);
 287         filemap_fdatawrite(metamapping);
 288         if (isreg) {
 289                 struct address_space *mapping = ip->i_inode.i_mapping;
 290                 filemap_fdatawrite(mapping);
 291                 error = filemap_fdatawait(mapping);
 292                 mapping_set_error(mapping, error);
 293         }
 294         ret = filemap_fdatawait(metamapping);
 295         mapping_set_error(metamapping, ret);
 296         if (!error)
 297                 error = ret;
 298         gfs2_ail_empty_gl(gl);
 299         /*
 300          * Writeback of the data mapping may cause the dirty flag to be set
 301          * so we have to clear it again here.
 302          */
 303         smp_mb__before_atomic();
 304         clear_bit(GLF_DIRTY, &gl->gl_flags);
 305
 306 out:
 307         gfs2_clear_glop_pending(ip);
 308         return error;
 309 }
 310
 311 /**
 312  * inode_go_inval - prepare a inode glock to be released
 313  * @gl: the glock
 314  * @flags:
 315  *
 316  * Normally we invalidate everything, but if we are moving into
 317  * LM_ST_DEFERRED from LM_ST_SHARED or LM_ST_EXCLUSIVE then we
 318  * can keep hold of the metadata, since it won't have changed.
 319  *
 320  */
 321
 322 static void inode_go_inval(struct gfs2_glock *gl, int flags)
 323 {
 324         struct gfs2_inode *ip = gfs2_glock2inode(gl);
 325
 326         if (flags & DIO_METADATA) {
 327                 struct address_space *mapping = gfs2_glock2aspace(gl);
 328                 truncate_inode_pages(mapping, 0);
 329                 if (ip) {
 330                         set_bit(GIF_INVALID, &ip->i_flags);
 331                         forget_all_cached_acls(&ip->i_inode);
 332                         security_inode_invalidate_secctx(&ip->i_inode);
 333                         gfs2_dir_hash_inval(ip);
 334                 }
 335         }
 336
 337         if (ip == GFS2_I(gl->gl_name.ln_sbd->sd_rindex)) {
 338                 gfs2_log_flush(gl->gl_name.ln_sbd, NULL,
 339                                GFS2_LOG_HEAD_FLUSH_NORMAL |
 340                                GFS2_LFC_INODE_GO_INVAL);
 341                 gl->gl_name.ln_sbd->sd_rindex_uptodate = 0;
 342         }
 343         if (ip && S_ISREG(ip->i_inode.i_mode))
 344                 truncate_inode_pages(ip->i_inode.i_mapping, 0);
 345
 346         gfs2_clear_glop_pending(ip);
 347 }
 348
 349 /**
 350  * inode_go_demote_ok - Check to see if it's ok to unlock an inode glock
 351  * @gl: the glock
 352  *
 353  * Returns: 1 if it's ok
 354  */
 355
 356 static int inode_go_demote_ok(const struct gfs2_glock *gl)
 357 {
 358         struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
 359
 360         if (sdp->sd_jindex == gl->gl_object || sdp->sd_rindex == gl->gl_object)
 361                 return 0;
 362
 363         return 1;
 364 }
 365
 366 static int gfs2_dinode_in(struct gfs2_inode *ip, const void *buf)
 367 {
 368         const struct gfs2_dinode *str = buf;
 369         struct timespec64 atime;
 370         u16 height, depth;
 371
 372         if (unlikely(ip->i_no_addr != be64_to_cpu(str->di_num.no_addr)))
 373                 goto corrupt;
 374         ip->i_no_formal_ino = be64_to_cpu(str->di_num.no_formal_ino);
 375         ip->i_inode.i_mode = be32_to_cpu(str->di_mode);
 376         ip->i_inode.i_rdev = 0;
 377         switch (ip->i_inode.i_mode & S_IFMT) {
 378         case S_IFBLK:
 379         case S_IFCHR:
 380                 ip->i_inode.i_rdev = MKDEV(be32_to_cpu(str->di_major),
 381                                            be32_to_cpu(str->di_minor));
 382                 break;
 383         }
 384
 385         i_uid_write(&ip->i_inode, be32_to_cpu(str->di_uid));
 386         i_gid_write(&ip->i_inode, be32_to_cpu(str->di_gid));
 387         set_nlink(&ip->i_inode, be32_to_cpu(str->di_nlink));
 388         i_size_write(&ip->i_inode, be64_to_cpu(str->di_size));
 389         gfs2_set_inode_blocks(&ip->i_inode, be64_to_cpu(str->di_blocks));
 390         atime.tv_sec = be64_to_cpu(str->di_atime);
 391         atime.tv_nsec = be32_to_cpu(str->di_atime_nsec);
 392         if (timespec64_compare(&ip->i_inode.i_atime, &atime) < 0)
 393                 ip->i_inode.i_atime = atime;
 394         ip->i_inode.i_mtime.tv_sec = be64_to_cpu(str->di_mtime);
 395         ip->i_inode.i_mtime.tv_nsec = be32_to_cpu(str->di_mtime_nsec);
 396         ip->i_inode.i_ctime.tv_sec = be64_to_cpu(str->di_ctime);
 397         ip->i_inode.i_ctime.tv_nsec = be32_to_cpu(str->di_ctime_nsec);
 398
 399         ip->i_goal = be64_to_cpu(str->di_goal_meta);
 400         ip->i_generation = be64_to_cpu(str->di_generation);
 401
 402         ip->i_diskflags = be32_to_cpu(str->di_flags);
 403         ip->i_eattr = be64_to_cpu(str->di_eattr);
 404         /* i_diskflags and i_eattr must be set before gfs2_set_inode_flags() */
 405         gfs2_set_inode_flags(&ip->i_inode);
 406         height = be16_to_cpu(str->di_height);
 407         if (unlikely(height > GFS2_MAX_META_HEIGHT))
 408                 goto corrupt;
 409         ip->i_height = (u8)height;
 410
 411         depth = be16_to_cpu(str->di_depth);
 412         if (unlikely(depth > GFS2_DIR_MAX_DEPTH))
 413                 goto corrupt;
 414         ip->i_depth = (u8)depth;
 415         ip->i_entries = be32_to_cpu(str->di_entries);
 416
 417         if (S_ISREG(ip->i_inode.i_mode))
 418                 gfs2_set_aops(&ip->i_inode);
 419
 420         return 0;
 421 corrupt:
 422         gfs2_consist_inode(ip);
 423         return -EIO;
 424 }
 425
 426 /**
 427  * gfs2_inode_refresh - Refresh the incore copy of the dinode
 428  * @ip: The GFS2 inode
 429  *
 430  * Returns: errno
 431  */
 432
 433 int gfs2_inode_refresh(struct gfs2_inode *ip)
 434 {
 435         struct buffer_head *dibh;
 436         int error;
 437
 438         error = gfs2_meta_inode_buffer(ip, &dibh);
 439         if (error)
 440                 return error;
 441
 442         error = gfs2_dinode_in(ip, dibh->b_data);
 443         brelse(dibh);
 444         clear_bit(GIF_INVALID, &ip->i_flags);
 445
 446         return error;
 447 }
 448
 449 /**
 450  * inode_go_lock - operation done after an inode lock is locked by a process
 451  * @gl: the glock
 452  * @flags:
 453  *
 454  * Returns: errno
 455  */
 456
 457 static int inode_go_lock(struct gfs2_holder *gh)
 458 {
 459         struct gfs2_glock *gl = gh->gh_gl;
 460         struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
 461         struct gfs2_inode *ip = gl->gl_object;
 462         int error = 0;
 463
 464         if (!ip || (gh->gh_flags & GL_SKIP))
 465                 return 0;
 466
 467         if (test_bit(GIF_INVALID, &ip->i_flags)) {
 468                 error = gfs2_inode_refresh(ip);
 469                 if (error)
 470                         return error;
 471         }
 472
 473         if (gh->gh_state != LM_ST_DEFERRED)
 474                 inode_dio_wait(&ip->i_inode);
 475
 476         if ((ip->i_diskflags & GFS2_DIF_TRUNC_IN_PROG) &&
 477             (gl->gl_state == LM_ST_EXCLUSIVE) &&
 478             (gh->gh_state == LM_ST_EXCLUSIVE)) {
 479                 spin_lock(&sdp->sd_trunc_lock);
 480                 if (list_empty(&ip->i_trunc_list))
 481                         list_add(&ip->i_trunc_list, &sdp->sd_trunc_list);
 482                 spin_unlock(&sdp->sd_trunc_lock);
 483                 wake_up(&sdp->sd_quota_wait);
 484                 return 1;
 485         }
 486
 487         return error;
 488 }
 489
 490 /**
 491  * inode_go_dump - print information about an inode
 492  * @seq: The iterator
 493  * @ip: the inode
 494  * @fs_id_buf: file system id (may be empty)
 495  *
 496  */
 497
 498 static void inode_go_dump(struct seq_file *seq, struct gfs2_glock *gl,
 499                           const char *fs_id_buf)
 500 {
 501         struct gfs2_inode *ip = gl->gl_object;
 502         struct inode *inode = &ip->i_inode;
 503         unsigned long nrpages;
 504
 505         if (ip == NULL)
 506                 return;
 507
 508         xa_lock_irq(&inode->i_data.i_pages);
 509         nrpages = inode->i_data.nrpages;
 510         xa_unlock_irq(&inode->i_data.i_pages);
 511
 512         gfs2_print_dbg(seq, "%s I: n:%llu/%llu t:%u f:0x%02lx d:0x%08x s:%llu "
 513                        "p:%lu\n", fs_id_buf,
 514                   (unsigned long long)ip->i_no_formal_ino,
 515                   (unsigned long long)ip->i_no_addr,
 516                   IF2DT(ip->i_inode.i_mode), ip->i_flags,
 517                   (unsigned int)ip->i_diskflags,
 518                   (unsigned long long)i_size_read(inode), nrpages);
 519 }
 520
 521 /**
 522  * freeze_go_sync - promote/demote the freeze glock
 523  * @gl: the glock
 524  * @state: the requested state
 525  * @flags:
 526  *
 527  */
 528
 529 static int freeze_go_sync(struct gfs2_glock *gl)
 530 {
 531         int error = 0;
 532         struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
 533
 534         if (gl->gl_state == LM_ST_SHARED && !gfs2_withdrawn(sdp) &&
 535             test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
 536                 atomic_set(&sdp->sd_freeze_state, SFS_STARTING_FREEZE);
 537                 error = freeze_super(sdp->sd_vfs);
 538                 if (error) {
 539                         fs_info(sdp, "GFS2: couldn't freeze filesystem: %d\n",
 540                                 error);
 541                         if (gfs2_withdrawn(sdp)) {
 542                                 atomic_set(&sdp->sd_freeze_state, SFS_UNFROZEN);
 543                                 return 0;
 544                         }
 545                         gfs2_assert_withdraw(sdp, 0);
 546                 }
 547                 queue_work(gfs2_freeze_wq, &sdp->sd_freeze_work);
 548                 gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_FREEZE |
 549                                GFS2_LFC_FREEZE_GO_SYNC);
 550         }
 551         return 0;
 552 }
 553
 554 /**
 555  * freeze_go_xmote_bh - After promoting/demoting the freeze glock
 556  * @gl: the glock
 557  *
 558  */
 559
 560 static int freeze_go_xmote_bh(struct gfs2_glock *gl, struct gfs2_holder *gh)
 561 {
 562         struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
 563         struct gfs2_inode *ip = GFS2_I(sdp->sd_jdesc->jd_inode);
 564         struct gfs2_glock *j_gl = ip->i_gl;
 565         struct gfs2_log_header_host head;
 566         int error;
 567
 568         if (test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
 569                 j_gl->gl_ops->go_inval(j_gl, DIO_METADATA);
 570
 571                 error = gfs2_find_jhead(sdp->sd_jdesc, &head, false);
 572                 if (error)
 573                         gfs2_consist(sdp);
 574                 if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT))
 575                         gfs2_consist(sdp);
 576
 577                 /*  Initialize some head of the log stuff  */
 578                 if (!gfs2_withdrawn(sdp)) {
 579                         sdp->sd_log_sequence = head.lh_sequence + 1;
 580                         gfs2_log_pointers_init(sdp, head.lh_blkno);
 581                 }
 582         }
 583         return 0;
 584 }
 585
 586 /**
 587  * trans_go_demote_ok
 588  * @gl: the glock
 589  *
 590  * Always returns 0
 591  */
 592
 593 static int freeze_go_demote_ok(const struct gfs2_glock *gl)
 594 {
 595         return 0;
 596 }
 597
 598 /**
 599  * iopen_go_callback - schedule the dcache entry for the inode to be deleted
 600  * @gl: the glock
 601  *
 602  * gl_lockref.lock lock is held while calling this
 603  */
 604 static void iopen_go_callback(struct gfs2_glock *gl, bool remote)
 605 {
 606         struct gfs2_inode *ip = gl->gl_object;
 607         struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
 608
 609         if (!remote || sb_rdonly(sdp->sd_vfs))
 610                 return;
 611
 612         if (gl->gl_demote_state == LM_ST_UNLOCKED &&
 613             gl->gl_state == LM_ST_SHARED && ip) {
 614                 gl->gl_lockref.count++;
 615                 if (!queue_delayed_work(gfs2_delete_workqueue,
 616                                         &gl->gl_delete, 0))
 617                         gl->gl_lockref.count--;
 618         }
 619 }
 620
 621 static int iopen_go_demote_ok(const struct gfs2_glock *gl)
 622 {
 623        return !gfs2_delete_work_queued(gl);
 624 }
 625
 626 /**
 627  * inode_go_free - wake up anyone waiting for dlm's unlock ast to free it
 628  * @gl: glock being freed
 629  *
 630  * For now, this is only used for the journal inode glock. In withdraw
 631  * situations, we need to wait for the glock to be freed so that we know
 632  * other nodes may proceed with recovery / journal replay.
 633  */
 634 static void inode_go_free(struct gfs2_glock *gl)
 635 {
 636         /* Note that we cannot reference gl_object because it's already set
 637          * to NULL by this point in its lifecycle. */
 638         if (!test_bit(GLF_FREEING, &gl->gl_flags))
 639                 return;
 640         clear_bit_unlock(GLF_FREEING, &gl->gl_flags);
 641         wake_up_bit(&gl->gl_flags, GLF_FREEING);
 642 }
 643
 644 /**
 645  * nondisk_go_callback - used to signal when a node did a withdraw
 646  * @gl: the nondisk glock
 647  * @remote: true if this came from a different cluster node
 648  *
 649  */
 650 static void nondisk_go_callback(struct gfs2_glock *gl, bool remote)
 651 {
 652         struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
 653
 654         /* Ignore the callback unless it's from another node, and it's the
 655            live lock. */
 656         if (!remote || gl->gl_name.ln_number != GFS2_LIVE_LOCK)
 657                 return;
 658
 659         /* First order of business is to cancel the demote request. We don't
 660          * really want to demote a nondisk glock. At best it's just to inform
 661          * us of another node's withdraw. We'll keep it in SH mode. */
 662         clear_bit(GLF_DEMOTE, &gl->gl_flags);
 663         clear_bit(GLF_PENDING_DEMOTE, &gl->gl_flags);
 664
 665         /* Ignore the unlock if we're withdrawn, unmounting, or in recovery. */
 666         if (test_bit(SDF_NORECOVERY, &sdp->sd_flags) ||
 667             test_bit(SDF_WITHDRAWN, &sdp->sd_flags) ||
 668             test_bit(SDF_REMOTE_WITHDRAW, &sdp->sd_flags))
 669                 return;
 670
 671         /* We only care when a node wants us to unlock, because that means
 672          * they want a journal recovered. */
 673         if (gl->gl_demote_state != LM_ST_UNLOCKED)
 674                 return;
 675
 676         if (sdp->sd_args.ar_spectator) {
 677                 fs_warn(sdp, "Spectator node cannot recover journals.\n");
 678                 return;
 679         }
 680
 681         fs_warn(sdp, "Some node has withdrawn; checking for recovery.\n");
 682         set_bit(SDF_REMOTE_WITHDRAW, &sdp->sd_flags);
 683         /*
 684          * We can't call remote_withdraw directly here or gfs2_recover_journal
 685          * because this is called from the glock unlock function and the
 686          * remote_withdraw needs to enqueue and dequeue the same "live" glock
 687          * we were called from. So we queue it to the control work queue in
 688          * lock_dlm.
 689          */
 690         queue_delayed_work(gfs2_control_wq, &sdp->sd_control_work, 0);
 691 }
 692
 693 const struct gfs2_glock_operations gfs2_meta_glops = {
 694         .go_type = LM_TYPE_META,
 695         .go_flags = GLOF_NONDISK,
 696 };
 697
 698 const struct gfs2_glock_operations gfs2_inode_glops = {
 699         .go_sync = inode_go_sync,
 700         .go_inval = inode_go_inval,
 701         .go_demote_ok = inode_go_demote_ok,
 702         .go_lock = inode_go_lock,
 703         .go_dump = inode_go_dump,
 704         .go_type = LM_TYPE_INODE,
 705         .go_flags = GLOF_ASPACE | GLOF_LRU | GLOF_LVB,
 706         .go_free = inode_go_free,
 707 };
 708
 709 const struct gfs2_glock_operations gfs2_rgrp_glops = {
 710         .go_sync = rgrp_go_sync,
 711         .go_inval = rgrp_go_inval,
 712         .go_lock = gfs2_rgrp_go_lock,
 713         .go_dump = gfs2_rgrp_dump,
 714         .go_type = LM_TYPE_RGRP,
 715         .go_flags = GLOF_LVB,
 716 };
 717
 718 const struct gfs2_glock_operations gfs2_freeze_glops = {
 719         .go_sync = freeze_go_sync,
 720         .go_xmote_bh = freeze_go_xmote_bh,
 721         .go_demote_ok = freeze_go_demote_ok,
 722         .go_type = LM_TYPE_NONDISK,
 723         .go_flags = GLOF_NONDISK,
 724 };
 725
 726 const struct gfs2_glock_operations gfs2_iopen_glops = {
 727         .go_type = LM_TYPE_IOPEN,
 728         .go_callback = iopen_go_callback,
 729         .go_demote_ok = iopen_go_demote_ok,
 730         .go_flags = GLOF_LRU | GLOF_NONDISK,
 731 };
 732
 733 const struct gfs2_glock_operations gfs2_flock_glops = {
 734         .go_type = LM_TYPE_FLOCK,
 735         .go_flags = GLOF_LRU | GLOF_NONDISK,
 736 };
 737
 738 const struct gfs2_glock_operations gfs2_nondisk_glops = {
 739         .go_type = LM_TYPE_NONDISK,
 740         .go_flags = GLOF_NONDISK,
 741         .go_callback = nondisk_go_callback,
 742 };
 743
 744 const struct gfs2_glock_operations gfs2_quota_glops = {
 745         .go_type = LM_TYPE_QUOTA,
 746         .go_flags = GLOF_LVB | GLOF_LRU | GLOF_NONDISK,
 747 };
 748
 749 const struct gfs2_glock_operations gfs2_journal_glops = {
 750         .go_type = LM_TYPE_JOURNAL,
 751         .go_flags = GLOF_NONDISK,
 752 };
 753
 754 const struct gfs2_glock_operations *gfs2_glops_list[] = {
 755         [LM_TYPE_META] = &gfs2_meta_glops,
 756         [LM_TYPE_INODE] = &gfs2_inode_glops,
 757         [LM_TYPE_RGRP] = &gfs2_rgrp_glops,
 758         [LM_TYPE_IOPEN] = &gfs2_iopen_glops,
 759         [LM_TYPE_FLOCK] = &gfs2_flock_glops,
 760         [LM_TYPE_NONDISK] = &gfs2_nondisk_glops,
 761         [LM_TYPE_QUOTA] = &gfs2_quota_glops,
 762         [LM_TYPE_JOURNAL] = &gfs2_journal_glops,
 763 };
 764