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         struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
  37
  38         fs_err(sdp,
  39                "AIL buffer %p: blocknr %llu state 0x%08lx mapping %p page "
  40                "state 0x%lx\n",
  41                bh, (unsigned long long)bh->b_blocknr, bh->b_state,
  42                bh->b_page->mapping, bh->b_page->flags);
  43         fs_err(sdp, "AIL glock %u:%llu mapping %p\n",
  44                gl->gl_name.ln_type, gl->gl_name.ln_number,
  45                gfs2_glock2aspace(gl));
  46         gfs2_lm(sdp, "AIL error\n");
  47         gfs2_withdraw_delayed(sdp);
  48 }
  49
  50 /**
  51  * __gfs2_ail_flush - remove all buffers for a given lock from the AIL
  52  * @gl: the glock
  53  * @fsync: set when called from fsync (not all buffers will be clean)
  54  * @nr_revokes: Number of buffers to revoke
  55  *
  56  * None of the buffers should be dirty, locked, or pinned.
  57  */
  58
  59 static void __gfs2_ail_flush(struct gfs2_glock *gl, bool fsync,
  60                              unsigned int nr_revokes)
  61 {
  62         struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
  63         struct list_head *head = &gl->gl_ail_list;
  64         struct gfs2_bufdata *bd, *tmp;
  65         struct buffer_head *bh;
  66         const unsigned long b_state = (1UL << BH_Dirty)|(1UL << BH_Pinned)|(1UL << BH_Lock);
  67
  68         gfs2_log_lock(sdp);
  69         spin_lock(&sdp->sd_ail_lock);
  70         list_for_each_entry_safe_reverse(bd, tmp, head, bd_ail_gl_list) {
  71                 if (nr_revokes == 0)
  72                         break;
  73                 bh = bd->bd_bh;
  74                 if (bh->b_state & b_state) {
  75                         if (fsync)
  76                                 continue;
  77                         gfs2_ail_error(gl, bh);
  78                 }
  79                 gfs2_trans_add_revoke(sdp, bd);
  80                 nr_revokes--;
  81         }
  82         GLOCK_BUG_ON(gl, !fsync && atomic_read(&gl->gl_ail_count));
  83         spin_unlock(&sdp->sd_ail_lock);
  84         gfs2_log_unlock(sdp);
  85 }
  86
  87
  88 static int gfs2_ail_empty_gl(struct gfs2_glock *gl)
  89 {
  90         struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
  91         struct gfs2_trans tr;
  92         unsigned int revokes;
  93         int ret;
  94
  95         revokes = atomic_read(&gl->gl_ail_count);
  96
  97         if (!revokes) {
  98                 bool have_revokes;
  99                 bool log_in_flight;
 100
 101                 /*
 102                  * We have nothing on the ail, but there could be revokes on
 103                  * the sdp revoke queue, in which case, we still want to flush
 104                  * the log and wait for it to finish.
 105                  *
 106                  * If the sdp revoke list is empty too, we might still have an
 107                  * io outstanding for writing revokes, so we should wait for
 108                  * it before returning.
 109                  *
 110                  * If none of these conditions are true, our revokes are all
 111                  * flushed and we can return.
 112                  */
 113                 gfs2_log_lock(sdp);
 114                 have_revokes = !list_empty(&sdp->sd_log_revokes);
 115                 log_in_flight = atomic_read(&sdp->sd_log_in_flight);
 116                 gfs2_log_unlock(sdp);
 117                 if (have_revokes)
 118                         goto flush;
 119                 if (log_in_flight)
 120                         log_flush_wait(sdp);
 121                 return 0;
 122         }
 123
 124         memset(&tr, 0, sizeof(tr));
 125         set_bit(TR_ONSTACK, &tr.tr_flags);
 126         ret = __gfs2_trans_begin(&tr, sdp, 0, revokes, _RET_IP_);
 127         if (ret)
 128                 goto flush;
 129         __gfs2_ail_flush(gl, 0, revokes);
 130         gfs2_trans_end(sdp);
 131
 132 flush:
 133         gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_NORMAL |
 134                        GFS2_LFC_AIL_EMPTY_GL);
 135         return 0;
 136 }
 137
 138 void gfs2_ail_flush(struct gfs2_glock *gl, bool fsync)
 139 {
 140         struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
 141         unsigned int revokes = atomic_read(&gl->gl_ail_count);
 142         int ret;
 143
 144         if (!revokes)
 145                 return;
 146
 147         ret = gfs2_trans_begin(sdp, 0, revokes);
 148         if (ret)
 149                 return;
 150         __gfs2_ail_flush(gl, fsync, revokes);
 151         gfs2_trans_end(sdp);
 152         gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_NORMAL |
 153                        GFS2_LFC_AIL_FLUSH);
 154 }
 155
 156 /**
 157  * gfs2_rgrp_metasync - sync out the metadata of a resource group
 158  * @gl: the glock protecting the resource group
 159  *
 160  */
 161
 162 static int gfs2_rgrp_metasync(struct gfs2_glock *gl)
 163 {
 164         struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
 165         struct address_space *metamapping = &sdp->sd_aspace;
 166         struct gfs2_rgrpd *rgd = gfs2_glock2rgrp(gl);
 167         const unsigned bsize = sdp->sd_sb.sb_bsize;
 168         loff_t start = (rgd->rd_addr * bsize) & PAGE_MASK;
 169         loff_t end = PAGE_ALIGN((rgd->rd_addr + rgd->rd_length) * bsize) - 1;
 170         int error;
 171
 172         filemap_fdatawrite_range(metamapping, start, end);
 173         error = filemap_fdatawait_range(metamapping, start, end);
 174         WARN_ON_ONCE(error && !gfs2_withdrawn(sdp));
 175         mapping_set_error(metamapping, error);
 176         if (error)
 177                 gfs2_io_error(sdp);
 178         return error;
 179 }
 180
 181 /**
 182  * rgrp_go_sync - sync out the metadata for this glock
 183  * @gl: the glock
 184  *
 185  * Called when demoting or unlocking an EX glock.  We must flush
 186  * to disk all dirty buffers/pages relating to this glock, and must not
 187  * return to caller to demote/unlock the glock until I/O is complete.
 188  */
 189
 190 static int rgrp_go_sync(struct gfs2_glock *gl)
 191 {
 192         struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
 193         struct gfs2_rgrpd *rgd = gfs2_glock2rgrp(gl);
 194         int error;
 195
 196         if (!test_and_clear_bit(GLF_DIRTY, &gl->gl_flags))
 197                 return 0;
 198         GLOCK_BUG_ON(gl, gl->gl_state != LM_ST_EXCLUSIVE);
 199
 200         gfs2_log_flush(sdp, gl, GFS2_LOG_HEAD_FLUSH_NORMAL |
 201                        GFS2_LFC_RGRP_GO_SYNC);
 202         error = gfs2_rgrp_metasync(gl);
 203         if (!error)
 204                 error = gfs2_ail_empty_gl(gl);
 205         gfs2_free_clones(rgd);
 206         return error;
 207 }
 208
 209 /**
 210  * rgrp_go_inval - invalidate the metadata for this glock
 211  * @gl: the glock
 212  * @flags:
 213  *
 214  * We never used LM_ST_DEFERRED with resource groups, so that we
 215  * should always see the metadata flag set here.
 216  *
 217  */
 218
 219 static void rgrp_go_inval(struct gfs2_glock *gl, int flags)
 220 {
 221         struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
 222         struct address_space *mapping = &sdp->sd_aspace;
 223         struct gfs2_rgrpd *rgd = gfs2_glock2rgrp(gl);
 224         const unsigned bsize = sdp->sd_sb.sb_bsize;
 225         loff_t start = (rgd->rd_addr * bsize) & PAGE_MASK;
 226         loff_t end = PAGE_ALIGN((rgd->rd_addr + rgd->rd_length) * bsize) - 1;
 227
 228         gfs2_rgrp_brelse(rgd);
 229         WARN_ON_ONCE(!(flags & DIO_METADATA));
 230         truncate_inode_pages_range(mapping, start, end);
 231         rgd->rd_flags &= ~GFS2_RDF_UPTODATE;
 232 }
 233
 234 static void gfs2_rgrp_go_dump(struct seq_file *seq, struct gfs2_glock *gl,
 235                               const char *fs_id_buf)
 236 {
 237         struct gfs2_rgrpd *rgd = gl->gl_object;
 238
 239         if (rgd)
 240                 gfs2_rgrp_dump(seq, rgd, fs_id_buf);
 241 }
 242
 243 static struct gfs2_inode *gfs2_glock2inode(struct gfs2_glock *gl)
 244 {
 245         struct gfs2_inode *ip;
 246
 247         spin_lock(&gl->gl_lockref.lock);
 248         ip = gl->gl_object;
 249         if (ip)
 250                 set_bit(GIF_GLOP_PENDING, &ip->i_flags);
 251         spin_unlock(&gl->gl_lockref.lock);
 252         return ip;
 253 }
 254
 255 struct gfs2_rgrpd *gfs2_glock2rgrp(struct gfs2_glock *gl)
 256 {
 257         struct gfs2_rgrpd *rgd;
 258
 259         spin_lock(&gl->gl_lockref.lock);
 260         rgd = gl->gl_object;
 261         spin_unlock(&gl->gl_lockref.lock);
 262
 263         return rgd;
 264 }
 265
 266 static void gfs2_clear_glop_pending(struct gfs2_inode *ip)
 267 {
 268         if (!ip)
 269                 return;
 270
 271         clear_bit_unlock(GIF_GLOP_PENDING, &ip->i_flags);
 272         wake_up_bit(&ip->i_flags, GIF_GLOP_PENDING);
 273 }
 274
 275 /**
 276  * gfs2_inode_metasync - sync out the metadata of an inode
 277  * @gl: the glock protecting the inode
 278  *
 279  */
 280 int gfs2_inode_metasync(struct gfs2_glock *gl)
 281 {
 282         struct address_space *metamapping = gfs2_glock2aspace(gl);
 283         int error;
 284
 285         filemap_fdatawrite(metamapping);
 286         error = filemap_fdatawait(metamapping);
 287         if (error)
 288                 gfs2_io_error(gl->gl_name.ln_sbd);
 289         return error;
 290 }
 291
 292 /**
 293  * inode_go_sync - Sync the dirty metadata of an inode
 294  * @gl: the glock protecting the inode
 295  *
 296  */
 297
 298 static int inode_go_sync(struct gfs2_glock *gl)
 299 {
 300         struct gfs2_inode *ip = gfs2_glock2inode(gl);
 301         int isreg = ip && S_ISREG(ip->i_inode.i_mode);
 302         struct address_space *metamapping = gfs2_glock2aspace(gl);
 303         int error = 0, ret;
 304
 305         if (isreg) {
 306                 if (test_and_clear_bit(GIF_SW_PAGED, &ip->i_flags))
 307                         unmap_shared_mapping_range(ip->i_inode.i_mapping, 0, 0);
 308                 inode_dio_wait(&ip->i_inode);
 309         }
 310         if (!test_and_clear_bit(GLF_DIRTY, &gl->gl_flags))
 311                 goto out;
 312
 313         GLOCK_BUG_ON(gl, gl->gl_state != LM_ST_EXCLUSIVE);
 314
 315         gfs2_log_flush(gl->gl_name.ln_sbd, gl, GFS2_LOG_HEAD_FLUSH_NORMAL |
 316                        GFS2_LFC_INODE_GO_SYNC);
 317         filemap_fdatawrite(metamapping);
 318         if (isreg) {
 319                 struct address_space *mapping = ip->i_inode.i_mapping;
 320                 filemap_fdatawrite(mapping);
 321                 error = filemap_fdatawait(mapping);
 322                 mapping_set_error(mapping, error);
 323         }
 324         ret = gfs2_inode_metasync(gl);
 325         if (!error)
 326                 error = ret;
 327         gfs2_ail_empty_gl(gl);
 328         /*
 329          * Writeback of the data mapping may cause the dirty flag to be set
 330          * so we have to clear it again here.
 331          */
 332         smp_mb__before_atomic();
 333         clear_bit(GLF_DIRTY, &gl->gl_flags);
 334
 335 out:
 336         gfs2_clear_glop_pending(ip);
 337         return error;
 338 }
 339
 340 /**
 341  * inode_go_inval - prepare a inode glock to be released
 342  * @gl: the glock
 343  * @flags:
 344  *
 345  * Normally we invalidate everything, but if we are moving into
 346  * LM_ST_DEFERRED from LM_ST_SHARED or LM_ST_EXCLUSIVE then we
 347  * can keep hold of the metadata, since it won't have changed.
 348  *
 349  */
 350
 351 static void inode_go_inval(struct gfs2_glock *gl, int flags)
 352 {
 353         struct gfs2_inode *ip = gfs2_glock2inode(gl);
 354
 355         if (flags & DIO_METADATA) {
 356                 struct address_space *mapping = gfs2_glock2aspace(gl);
 357                 truncate_inode_pages(mapping, 0);
 358                 if (ip) {
 359                         set_bit(GIF_INVALID, &ip->i_flags);
 360                         forget_all_cached_acls(&ip->i_inode);
 361                         security_inode_invalidate_secctx(&ip->i_inode);
 362                         gfs2_dir_hash_inval(ip);
 363                 }
 364         }
 365
 366         if (ip == GFS2_I(gl->gl_name.ln_sbd->sd_rindex)) {
 367                 gfs2_log_flush(gl->gl_name.ln_sbd, NULL,
 368                                GFS2_LOG_HEAD_FLUSH_NORMAL |
 369                                GFS2_LFC_INODE_GO_INVAL);
 370                 gl->gl_name.ln_sbd->sd_rindex_uptodate = 0;
 371         }
 372         if (ip && S_ISREG(ip->i_inode.i_mode))
 373                 truncate_inode_pages(ip->i_inode.i_mapping, 0);
 374
 375         gfs2_clear_glop_pending(ip);
 376 }
 377
 378 /**
 379  * inode_go_demote_ok - Check to see if it's ok to unlock an inode glock
 380  * @gl: the glock
 381  *
 382  * Returns: 1 if it's ok
 383  */
 384
 385 static int inode_go_demote_ok(const struct gfs2_glock *gl)
 386 {
 387         struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
 388
 389         if (sdp->sd_jindex == gl->gl_object || sdp->sd_rindex == gl->gl_object)
 390                 return 0;
 391
 392         return 1;
 393 }
 394
 395 static int gfs2_dinode_in(struct gfs2_inode *ip, const void *buf)
 396 {
 397         const struct gfs2_dinode *str = buf;
 398         struct timespec64 atime;
 399         u16 height, depth;
 400         umode_t mode = be32_to_cpu(str->di_mode);
 401         bool is_new = ip->i_inode.i_state & I_NEW;
 402
 403         if (unlikely(ip->i_no_addr != be64_to_cpu(str->di_num.no_addr)))
 404                 goto corrupt;
 405         if (unlikely(!is_new && inode_wrong_type(&ip->i_inode, mode)))
 406                 goto corrupt;
 407         ip->i_no_formal_ino = be64_to_cpu(str->di_num.no_formal_ino);
 408         ip->i_inode.i_mode = mode;
 409         if (is_new) {
 410                 ip->i_inode.i_rdev = 0;
 411                 switch (mode & S_IFMT) {
 412                 case S_IFBLK:
 413                 case S_IFCHR:
 414                         ip->i_inode.i_rdev = MKDEV(be32_to_cpu(str->di_major),
 415                                                    be32_to_cpu(str->di_minor));
 416                         break;
 417                 }
 418         }
 419
 420         i_uid_write(&ip->i_inode, be32_to_cpu(str->di_uid));
 421         i_gid_write(&ip->i_inode, be32_to_cpu(str->di_gid));
 422         set_nlink(&ip->i_inode, be32_to_cpu(str->di_nlink));
 423         i_size_write(&ip->i_inode, be64_to_cpu(str->di_size));
 424         gfs2_set_inode_blocks(&ip->i_inode, be64_to_cpu(str->di_blocks));
 425         atime.tv_sec = be64_to_cpu(str->di_atime);
 426         atime.tv_nsec = be32_to_cpu(str->di_atime_nsec);
 427         if (timespec64_compare(&ip->i_inode.i_atime, &atime) < 0)
 428                 ip->i_inode.i_atime = atime;
 429         ip->i_inode.i_mtime.tv_sec = be64_to_cpu(str->di_mtime);
 430         ip->i_inode.i_mtime.tv_nsec = be32_to_cpu(str->di_mtime_nsec);
 431         ip->i_inode.i_ctime.tv_sec = be64_to_cpu(str->di_ctime);
 432         ip->i_inode.i_ctime.tv_nsec = be32_to_cpu(str->di_ctime_nsec);
 433
 434         ip->i_goal = be64_to_cpu(str->di_goal_meta);
 435         ip->i_generation = be64_to_cpu(str->di_generation);
 436
 437         ip->i_diskflags = be32_to_cpu(str->di_flags);
 438         ip->i_eattr = be64_to_cpu(str->di_eattr);
 439         /* i_diskflags and i_eattr must be set before gfs2_set_inode_flags() */
 440         gfs2_set_inode_flags(&ip->i_inode);
 441         height = be16_to_cpu(str->di_height);
 442         if (unlikely(height > GFS2_MAX_META_HEIGHT))
 443                 goto corrupt;
 444         ip->i_height = (u8)height;
 445
 446         depth = be16_to_cpu(str->di_depth);
 447         if (unlikely(depth > GFS2_DIR_MAX_DEPTH))
 448                 goto corrupt;
 449         ip->i_depth = (u8)depth;
 450         ip->i_entries = be32_to_cpu(str->di_entries);
 451
 452         if (S_ISREG(ip->i_inode.i_mode))
 453                 gfs2_set_aops(&ip->i_inode);
 454
 455         return 0;
 456 corrupt:
 457         gfs2_consist_inode(ip);
 458         return -EIO;
 459 }
 460
 461 /**
 462  * gfs2_inode_refresh - Refresh the incore copy of the dinode
 463  * @ip: The GFS2 inode
 464  *
 465  * Returns: errno
 466  */
 467
 468 int gfs2_inode_refresh(struct gfs2_inode *ip)
 469 {
 470         struct buffer_head *dibh;
 471         int error;
 472
 473         error = gfs2_meta_inode_buffer(ip, &dibh);
 474         if (error)
 475                 return error;
 476
 477         error = gfs2_dinode_in(ip, dibh->b_data);
 478         brelse(dibh);
 479         clear_bit(GIF_INVALID, &ip->i_flags);
 480
 481         return error;
 482 }
 483
 484 /**
 485  * inode_go_lock - operation done after an inode lock is locked by a process
 486  * @gh: The glock holder
 487  *
 488  * Returns: errno
 489  */
 490
 491 static int inode_go_lock(struct gfs2_holder *gh)
 492 {
 493         struct gfs2_glock *gl = gh->gh_gl;
 494         struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
 495         struct gfs2_inode *ip = gl->gl_object;
 496         int error = 0;
 497
 498         if (!ip || (gh->gh_flags & GL_SKIP))
 499                 return 0;
 500
 501         if (test_bit(GIF_INVALID, &ip->i_flags)) {
 502                 error = gfs2_inode_refresh(ip);
 503                 if (error)
 504                         return error;
 505         }
 506
 507         if (gh->gh_state != LM_ST_DEFERRED)
 508                 inode_dio_wait(&ip->i_inode);
 509
 510         if ((ip->i_diskflags & GFS2_DIF_TRUNC_IN_PROG) &&
 511             (gl->gl_state == LM_ST_EXCLUSIVE) &&
 512             (gh->gh_state == LM_ST_EXCLUSIVE)) {
 513                 spin_lock(&sdp->sd_trunc_lock);
 514                 if (list_empty(&ip->i_trunc_list))
 515                         list_add(&ip->i_trunc_list, &sdp->sd_trunc_list);
 516                 spin_unlock(&sdp->sd_trunc_lock);
 517                 wake_up(&sdp->sd_quota_wait);
 518                 return 1;
 519         }
 520
 521         return error;
 522 }
 523
 524 /**
 525  * inode_go_dump - print information about an inode
 526  * @seq: The iterator
 527  * @gl: The glock
 528  * @fs_id_buf: file system id (may be empty)
 529  *
 530  */
 531
 532 static void inode_go_dump(struct seq_file *seq, struct gfs2_glock *gl,
 533                           const char *fs_id_buf)
 534 {
 535         struct gfs2_inode *ip = gl->gl_object;
 536         struct inode *inode = &ip->i_inode;
 537         unsigned long nrpages;
 538
 539         if (ip == NULL)
 540                 return;
 541
 542         xa_lock_irq(&inode->i_data.i_pages);
 543         nrpages = inode->i_data.nrpages;
 544         xa_unlock_irq(&inode->i_data.i_pages);
 545
 546         gfs2_print_dbg(seq, "%s I: n:%llu/%llu t:%u f:0x%02lx d:0x%08x s:%llu "
 547                        "p:%lu\n", fs_id_buf,
 548                   (unsigned long long)ip->i_no_formal_ino,
 549                   (unsigned long long)ip->i_no_addr,
 550                   IF2DT(ip->i_inode.i_mode), ip->i_flags,
 551                   (unsigned int)ip->i_diskflags,
 552                   (unsigned long long)i_size_read(inode), nrpages);
 553 }
 554
 555 /**
 556  * freeze_go_sync - promote/demote the freeze glock
 557  * @gl: the glock
 558  */
 559
 560 static int freeze_go_sync(struct gfs2_glock *gl)
 561 {
 562         int error = 0;
 563         struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
 564
 565         /*
 566          * We need to check gl_state == LM_ST_SHARED here and not gl_req ==
 567          * LM_ST_EXCLUSIVE. That's because when any node does a freeze,
 568          * all the nodes should have the freeze glock in SH mode and they all
 569          * call do_xmote: One for EX and the others for UN. They ALL must
 570          * freeze locally, and they ALL must queue freeze work. The freeze_work
 571          * calls freeze_func, which tries to reacquire the freeze glock in SH,
 572          * effectively waiting for the thaw on the node who holds it in EX.
 573          * Once thawed, the work func acquires the freeze glock in
 574          * SH and everybody goes back to thawed.
 575          */
 576         if (gl->gl_state == LM_ST_SHARED && !gfs2_withdrawn(sdp) &&
 577             !test_bit(SDF_NORECOVERY, &sdp->sd_flags)) {
 578                 atomic_set(&sdp->sd_freeze_state, SFS_STARTING_FREEZE);
 579                 error = freeze_super(sdp->sd_vfs);
 580                 if (error) {
 581                         fs_info(sdp, "GFS2: couldn't freeze filesystem: %d\n",
 582                                 error);
 583                         if (gfs2_withdrawn(sdp)) {
 584                                 atomic_set(&sdp->sd_freeze_state, SFS_UNFROZEN);
 585                                 return 0;
 586                         }
 587                         gfs2_assert_withdraw(sdp, 0);
 588                 }
 589                 queue_work(gfs2_freeze_wq, &sdp->sd_freeze_work);
 590                 if (test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags))
 591                         gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_FREEZE |
 592                                        GFS2_LFC_FREEZE_GO_SYNC);
 593                 else /* read-only mounts */
 594                         atomic_set(&sdp->sd_freeze_state, SFS_FROZEN);
 595         }
 596         return 0;
 597 }
 598
 599 /**
 600  * freeze_go_xmote_bh - After promoting/demoting the freeze glock
 601  * @gl: the glock
 602  */
 603 static int freeze_go_xmote_bh(struct gfs2_glock *gl)
 604 {
 605         struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
 606         struct gfs2_inode *ip = GFS2_I(sdp->sd_jdesc->jd_inode);
 607         struct gfs2_glock *j_gl = ip->i_gl;
 608         struct gfs2_log_header_host head;
 609         int error;
 610
 611         if (test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
 612                 j_gl->gl_ops->go_inval(j_gl, DIO_METADATA);
 613
 614                 error = gfs2_find_jhead(sdp->sd_jdesc, &head, false);
 615                 if (gfs2_assert_withdraw_delayed(sdp, !error))
 616                         return error;
 617                 if (gfs2_assert_withdraw_delayed(sdp, head.lh_flags &
 618                                                  GFS2_LOG_HEAD_UNMOUNT))
 619                         return -EIO;
 620                 sdp->sd_log_sequence = head.lh_sequence + 1;
 621                 gfs2_log_pointers_init(sdp, head.lh_blkno);
 622         }
 623         return 0;
 624 }
 625
 626 /**
 627  * freeze_go_demote_ok
 628  * @gl: the glock
 629  *
 630  * Always returns 0
 631  */
 632
 633 static int freeze_go_demote_ok(const struct gfs2_glock *gl)
 634 {
 635         return 0;
 636 }
 637
 638 /**
 639  * iopen_go_callback - schedule the dcache entry for the inode to be deleted
 640  * @gl: the glock
 641  * @remote: true if this came from a different cluster node
 642  *
 643  * gl_lockref.lock lock is held while calling this
 644  */
 645 static void iopen_go_callback(struct gfs2_glock *gl, bool remote)
 646 {
 647         struct gfs2_inode *ip = gl->gl_object;
 648         struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
 649
 650         if (!remote || sb_rdonly(sdp->sd_vfs))
 651                 return;
 652
 653         if (gl->gl_demote_state == LM_ST_UNLOCKED &&
 654             gl->gl_state == LM_ST_SHARED && ip) {
 655                 gl->gl_lockref.count++;
 656                 if (!queue_delayed_work(gfs2_delete_workqueue,
 657                                         &gl->gl_delete, 0))
 658                         gl->gl_lockref.count--;
 659         }
 660 }
 661
 662 static int iopen_go_demote_ok(const struct gfs2_glock *gl)
 663 {
 664        return !gfs2_delete_work_queued(gl);
 665 }
 666
 667 /**
 668  * inode_go_free - wake up anyone waiting for dlm's unlock ast to free it
 669  * @gl: glock being freed
 670  *
 671  * For now, this is only used for the journal inode glock. In withdraw
 672  * situations, we need to wait for the glock to be freed so that we know
 673  * other nodes may proceed with recovery / journal replay.
 674  */
 675 static void inode_go_free(struct gfs2_glock *gl)
 676 {
 677         /* Note that we cannot reference gl_object because it's already set
 678          * to NULL by this point in its lifecycle. */
 679         if (!test_bit(GLF_FREEING, &gl->gl_flags))
 680                 return;
 681         clear_bit_unlock(GLF_FREEING, &gl->gl_flags);
 682         wake_up_bit(&gl->gl_flags, GLF_FREEING);
 683 }
 684
 685 /**
 686  * nondisk_go_callback - used to signal when a node did a withdraw
 687  * @gl: the nondisk glock
 688  * @remote: true if this came from a different cluster node
 689  *
 690  */
 691 static void nondisk_go_callback(struct gfs2_glock *gl, bool remote)
 692 {
 693         struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
 694
 695         /* Ignore the callback unless it's from another node, and it's the
 696            live lock. */
 697         if (!remote || gl->gl_name.ln_number != GFS2_LIVE_LOCK)
 698                 return;
 699
 700         /* First order of business is to cancel the demote request. We don't
 701          * really want to demote a nondisk glock. At best it's just to inform
 702          * us of another node's withdraw. We'll keep it in SH mode. */
 703         clear_bit(GLF_DEMOTE, &gl->gl_flags);
 704         clear_bit(GLF_PENDING_DEMOTE, &gl->gl_flags);
 705
 706         /* Ignore the unlock if we're withdrawn, unmounting, or in recovery. */
 707         if (test_bit(SDF_NORECOVERY, &sdp->sd_flags) ||
 708             test_bit(SDF_WITHDRAWN, &sdp->sd_flags) ||
 709             test_bit(SDF_REMOTE_WITHDRAW, &sdp->sd_flags))
 710                 return;
 711
 712         /* We only care when a node wants us to unlock, because that means
 713          * they want a journal recovered. */
 714         if (gl->gl_demote_state != LM_ST_UNLOCKED)
 715                 return;
 716
 717         if (sdp->sd_args.ar_spectator) {
 718                 fs_warn(sdp, "Spectator node cannot recover journals.\n");
 719                 return;
 720         }
 721
 722         fs_warn(sdp, "Some node has withdrawn; checking for recovery.\n");
 723         set_bit(SDF_REMOTE_WITHDRAW, &sdp->sd_flags);
 724         /*
 725          * We can't call remote_withdraw directly here or gfs2_recover_journal
 726          * because this is called from the glock unlock function and the
 727          * remote_withdraw needs to enqueue and dequeue the same "live" glock
 728          * we were called from. So we queue it to the control work queue in
 729          * lock_dlm.
 730          */
 731         queue_delayed_work(gfs2_control_wq, &sdp->sd_control_work, 0);
 732 }
 733
 734 const struct gfs2_glock_operations gfs2_meta_glops = {
 735         .go_type = LM_TYPE_META,
 736         .go_flags = GLOF_NONDISK,
 737 };
 738
 739 const struct gfs2_glock_operations gfs2_inode_glops = {
 740         .go_sync = inode_go_sync,
 741         .go_inval = inode_go_inval,
 742         .go_demote_ok = inode_go_demote_ok,
 743         .go_lock = inode_go_lock,
 744         .go_dump = inode_go_dump,
 745         .go_type = LM_TYPE_INODE,
 746         .go_flags = GLOF_ASPACE | GLOF_LRU | GLOF_LVB,
 747         .go_free = inode_go_free,
 748 };
 749
 750 const struct gfs2_glock_operations gfs2_rgrp_glops = {
 751         .go_sync = rgrp_go_sync,
 752         .go_inval = rgrp_go_inval,
 753         .go_lock = gfs2_rgrp_go_lock,
 754         .go_dump = gfs2_rgrp_go_dump,
 755         .go_type = LM_TYPE_RGRP,
 756         .go_flags = GLOF_LVB,
 757 };
 758
 759 const struct gfs2_glock_operations gfs2_freeze_glops = {
 760         .go_sync = freeze_go_sync,
 761         .go_xmote_bh = freeze_go_xmote_bh,
 762         .go_demote_ok = freeze_go_demote_ok,
 763         .go_type = LM_TYPE_NONDISK,
 764         .go_flags = GLOF_NONDISK,
 765 };
 766
 767 const struct gfs2_glock_operations gfs2_iopen_glops = {
 768         .go_type = LM_TYPE_IOPEN,
 769         .go_callback = iopen_go_callback,
 770         .go_demote_ok = iopen_go_demote_ok,
 771         .go_flags = GLOF_LRU | GLOF_NONDISK,
 772         .go_subclass = 1,
 773 };
 774
 775 const struct gfs2_glock_operations gfs2_flock_glops = {
 776         .go_type = LM_TYPE_FLOCK,
 777         .go_flags = GLOF_LRU | GLOF_NONDISK,
 778 };
 779
 780 const struct gfs2_glock_operations gfs2_nondisk_glops = {
 781         .go_type = LM_TYPE_NONDISK,
 782         .go_flags = GLOF_NONDISK,
 783         .go_callback = nondisk_go_callback,
 784 };
 785
 786 const struct gfs2_glock_operations gfs2_quota_glops = {
 787         .go_type = LM_TYPE_QUOTA,
 788         .go_flags = GLOF_LVB | GLOF_LRU | GLOF_NONDISK,
 789 };
 790
 791 const struct gfs2_glock_operations gfs2_journal_glops = {
 792         .go_type = LM_TYPE_JOURNAL,
 793         .go_flags = GLOF_NONDISK,
 794 };
 795
 796 const struct gfs2_glock_operations *gfs2_glops_list[] = {
 797         [LM_TYPE_META] = &gfs2_meta_glops,
 798         [LM_TYPE_INODE] = &gfs2_inode_glops,
 799         [LM_TYPE_RGRP] = &gfs2_rgrp_glops,
 800         [LM_TYPE_IOPEN] = &gfs2_iopen_glops,
 801         [LM_TYPE_FLOCK] = &gfs2_flock_glops,
 802         [LM_TYPE_NONDISK] = &gfs2_nondisk_glops,
 803         [LM_TYPE_QUOTA] = &gfs2_quota_glops,
 804         [LM_TYPE_JOURNAL] = &gfs2_journal_glops,
 805 };
 806