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 }
 232
 233 static void gfs2_rgrp_go_dump(struct seq_file *seq, struct gfs2_glock *gl,
 234                               const char *fs_id_buf)
 235 {
 236         struct gfs2_rgrpd *rgd = gl->gl_object;
 237
 238         if (rgd)
 239                 gfs2_rgrp_dump(seq, rgd, fs_id_buf);
 240 }
 241
 242 static struct gfs2_inode *gfs2_glock2inode(struct gfs2_glock *gl)
 243 {
 244         struct gfs2_inode *ip;
 245
 246         spin_lock(&gl->gl_lockref.lock);
 247         ip = gl->gl_object;
 248         if (ip)
 249                 set_bit(GIF_GLOP_PENDING, &ip->i_flags);
 250         spin_unlock(&gl->gl_lockref.lock);
 251         return ip;
 252 }
 253
 254 struct gfs2_rgrpd *gfs2_glock2rgrp(struct gfs2_glock *gl)
 255 {
 256         struct gfs2_rgrpd *rgd;
 257
 258         spin_lock(&gl->gl_lockref.lock);
 259         rgd = gl->gl_object;
 260         spin_unlock(&gl->gl_lockref.lock);
 261
 262         return rgd;
 263 }
 264
 265 static void gfs2_clear_glop_pending(struct gfs2_inode *ip)
 266 {
 267         if (!ip)
 268                 return;
 269
 270         clear_bit_unlock(GIF_GLOP_PENDING, &ip->i_flags);
 271         wake_up_bit(&ip->i_flags, GIF_GLOP_PENDING);
 272 }
 273
 274 /**
 275  * gfs2_inode_metasync - sync out the metadata of an inode
 276  * @gl: the glock protecting the inode
 277  *
 278  */
 279 int gfs2_inode_metasync(struct gfs2_glock *gl)
 280 {
 281         struct address_space *metamapping = gfs2_glock2aspace(gl);
 282         int error;
 283
 284         filemap_fdatawrite(metamapping);
 285         error = filemap_fdatawait(metamapping);
 286         if (error)
 287                 gfs2_io_error(gl->gl_name.ln_sbd);
 288         return error;
 289 }
 290
 291 /**
 292  * inode_go_sync - Sync the dirty metadata of an inode
 293  * @gl: the glock protecting the inode
 294  *
 295  */
 296
 297 static int inode_go_sync(struct gfs2_glock *gl)
 298 {
 299         struct gfs2_inode *ip = gfs2_glock2inode(gl);
 300         int isreg = ip && S_ISREG(ip->i_inode.i_mode);
 301         struct address_space *metamapping = gfs2_glock2aspace(gl);
 302         int error = 0, ret;
 303
 304         if (isreg) {
 305                 if (test_and_clear_bit(GIF_SW_PAGED, &ip->i_flags))
 306                         unmap_shared_mapping_range(ip->i_inode.i_mapping, 0, 0);
 307                 inode_dio_wait(&ip->i_inode);
 308         }
 309         if (!test_and_clear_bit(GLF_DIRTY, &gl->gl_flags))
 310                 goto out;
 311
 312         GLOCK_BUG_ON(gl, gl->gl_state != LM_ST_EXCLUSIVE);
 313
 314         gfs2_log_flush(gl->gl_name.ln_sbd, gl, GFS2_LOG_HEAD_FLUSH_NORMAL |
 315                        GFS2_LFC_INODE_GO_SYNC);
 316         filemap_fdatawrite(metamapping);
 317         if (isreg) {
 318                 struct address_space *mapping = ip->i_inode.i_mapping;
 319                 filemap_fdatawrite(mapping);
 320                 error = filemap_fdatawait(mapping);
 321                 mapping_set_error(mapping, error);
 322         }
 323         ret = gfs2_inode_metasync(gl);
 324         if (!error)
 325                 error = ret;
 326         gfs2_ail_empty_gl(gl);
 327         /*
 328          * Writeback of the data mapping may cause the dirty flag to be set
 329          * so we have to clear it again here.
 330          */
 331         smp_mb__before_atomic();
 332         clear_bit(GLF_DIRTY, &gl->gl_flags);
 333
 334 out:
 335         gfs2_clear_glop_pending(ip);
 336         return error;
 337 }
 338
 339 /**
 340  * inode_go_inval - prepare a inode glock to be released
 341  * @gl: the glock
 342  * @flags:
 343  *
 344  * Normally we invalidate everything, but if we are moving into
 345  * LM_ST_DEFERRED from LM_ST_SHARED or LM_ST_EXCLUSIVE then we
 346  * can keep hold of the metadata, since it won't have changed.
 347  *
 348  */
 349
 350 static void inode_go_inval(struct gfs2_glock *gl, int flags)
 351 {
 352         struct gfs2_inode *ip = gfs2_glock2inode(gl);
 353
 354         if (flags & DIO_METADATA) {
 355                 struct address_space *mapping = gfs2_glock2aspace(gl);
 356                 truncate_inode_pages(mapping, 0);
 357                 if (ip) {
 358                         set_bit(GLF_INSTANTIATE_NEEDED, &gl->gl_flags);
 359                         forget_all_cached_acls(&ip->i_inode);
 360                         security_inode_invalidate_secctx(&ip->i_inode);
 361                         gfs2_dir_hash_inval(ip);
 362                 }
 363         }
 364
 365         if (ip == GFS2_I(gl->gl_name.ln_sbd->sd_rindex)) {
 366                 gfs2_log_flush(gl->gl_name.ln_sbd, NULL,
 367                                GFS2_LOG_HEAD_FLUSH_NORMAL |
 368                                GFS2_LFC_INODE_GO_INVAL);
 369                 gl->gl_name.ln_sbd->sd_rindex_uptodate = 0;
 370         }
 371         if (ip && S_ISREG(ip->i_inode.i_mode))
 372                 truncate_inode_pages(ip->i_inode.i_mapping, 0);
 373
 374         gfs2_clear_glop_pending(ip);
 375 }
 376
 377 /**
 378  * inode_go_demote_ok - Check to see if it's ok to unlock an inode glock
 379  * @gl: the glock
 380  *
 381  * Returns: 1 if it's ok
 382  */
 383
 384 static int inode_go_demote_ok(const struct gfs2_glock *gl)
 385 {
 386         struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
 387
 388         if (sdp->sd_jindex == gl->gl_object || sdp->sd_rindex == gl->gl_object)
 389                 return 0;
 390
 391         return 1;
 392 }
 393
 394 static int gfs2_dinode_in(struct gfs2_inode *ip, const void *buf)
 395 {
 396         const struct gfs2_dinode *str = buf;
 397         struct timespec64 atime;
 398         u16 height, depth;
 399         umode_t mode = be32_to_cpu(str->di_mode);
 400         bool is_new = ip->i_inode.i_state & I_NEW;
 401
 402         if (unlikely(ip->i_no_addr != be64_to_cpu(str->di_num.no_addr)))
 403                 goto corrupt;
 404         if (unlikely(!is_new && inode_wrong_type(&ip->i_inode, mode)))
 405                 goto corrupt;
 406         ip->i_no_formal_ino = be64_to_cpu(str->di_num.no_formal_ino);
 407         ip->i_inode.i_mode = mode;
 408         if (is_new) {
 409                 ip->i_inode.i_rdev = 0;
 410                 switch (mode & S_IFMT) {
 411                 case S_IFBLK:
 412                 case S_IFCHR:
 413                         ip->i_inode.i_rdev = MKDEV(be32_to_cpu(str->di_major),
 414                                                    be32_to_cpu(str->di_minor));
 415                         break;
 416                 }
 417         }
 418
 419         i_uid_write(&ip->i_inode, be32_to_cpu(str->di_uid));
 420         i_gid_write(&ip->i_inode, be32_to_cpu(str->di_gid));
 421         set_nlink(&ip->i_inode, be32_to_cpu(str->di_nlink));
 422         i_size_write(&ip->i_inode, be64_to_cpu(str->di_size));
 423         gfs2_set_inode_blocks(&ip->i_inode, be64_to_cpu(str->di_blocks));
 424         atime.tv_sec = be64_to_cpu(str->di_atime);
 425         atime.tv_nsec = be32_to_cpu(str->di_atime_nsec);
 426         if (timespec64_compare(&ip->i_inode.i_atime, &atime) < 0)
 427                 ip->i_inode.i_atime = atime;
 428         ip->i_inode.i_mtime.tv_sec = be64_to_cpu(str->di_mtime);
 429         ip->i_inode.i_mtime.tv_nsec = be32_to_cpu(str->di_mtime_nsec);
 430         ip->i_inode.i_ctime.tv_sec = be64_to_cpu(str->di_ctime);
 431         ip->i_inode.i_ctime.tv_nsec = be32_to_cpu(str->di_ctime_nsec);
 432
 433         ip->i_goal = be64_to_cpu(str->di_goal_meta);
 434         ip->i_generation = be64_to_cpu(str->di_generation);
 435
 436         ip->i_diskflags = be32_to_cpu(str->di_flags);
 437         ip->i_eattr = be64_to_cpu(str->di_eattr);
 438         /* i_diskflags and i_eattr must be set before gfs2_set_inode_flags() */
 439         gfs2_set_inode_flags(&ip->i_inode);
 440         height = be16_to_cpu(str->di_height);
 441         if (unlikely(height > GFS2_MAX_META_HEIGHT))
 442                 goto corrupt;
 443         ip->i_height = (u8)height;
 444
 445         depth = be16_to_cpu(str->di_depth);
 446         if (unlikely(depth > GFS2_DIR_MAX_DEPTH))
 447                 goto corrupt;
 448         ip->i_depth = (u8)depth;
 449         ip->i_entries = be32_to_cpu(str->di_entries);
 450
 451         if (S_ISREG(ip->i_inode.i_mode))
 452                 gfs2_set_aops(&ip->i_inode);
 453
 454         return 0;
 455 corrupt:
 456         gfs2_consist_inode(ip);
 457         return -EIO;
 458 }
 459
 460 /**
 461  * gfs2_inode_refresh - Refresh the incore copy of the dinode
 462  * @ip: The GFS2 inode
 463  *
 464  * Returns: errno
 465  */
 466
 467 int gfs2_inode_refresh(struct gfs2_inode *ip)
 468 {
 469         struct buffer_head *dibh;
 470         int error;
 471
 472         error = gfs2_meta_inode_buffer(ip, &dibh);
 473         if (error)
 474                 return error;
 475
 476         error = gfs2_dinode_in(ip, dibh->b_data);
 477         brelse(dibh);
 478         return error;
 479 }
 480
 481 /**
 482  * inode_go_instantiate - read in an inode if necessary
 483  * @gh: The glock holder
 484  *
 485  * Returns: errno
 486  */
 487
 488 static int inode_go_instantiate(struct gfs2_holder *gh)
 489 {
 490         struct gfs2_glock *gl = gh->gh_gl;
 491         struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
 492         struct gfs2_inode *ip = gl->gl_object;
 493         int error = 0;
 494
 495         if (!ip) /* no inode to populate - read it in later */
 496                 goto out;
 497
 498         error = gfs2_inode_refresh(ip);
 499         if (error)
 500                 goto out;
 501
 502         if (gh->gh_state != LM_ST_DEFERRED)
 503                 inode_dio_wait(&ip->i_inode);
 504
 505         if ((ip->i_diskflags & GFS2_DIF_TRUNC_IN_PROG) &&
 506             (gl->gl_state == LM_ST_EXCLUSIVE) &&
 507             (gh->gh_state == LM_ST_EXCLUSIVE)) {
 508                 spin_lock(&sdp->sd_trunc_lock);
 509                 if (list_empty(&ip->i_trunc_list))
 510                         list_add(&ip->i_trunc_list, &sdp->sd_trunc_list);
 511                 spin_unlock(&sdp->sd_trunc_lock);
 512                 wake_up(&sdp->sd_quota_wait);
 513                 error = 1;
 514         }
 515
 516 out:
 517         return error;
 518 }
 519
 520 /**
 521  * inode_go_dump - print information about an inode
 522  * @seq: The iterator
 523  * @gl: The glock
 524  * @fs_id_buf: file system id (may be empty)
 525  *
 526  */
 527
 528 static void inode_go_dump(struct seq_file *seq, struct gfs2_glock *gl,
 529                           const char *fs_id_buf)
 530 {
 531         struct gfs2_inode *ip = gl->gl_object;
 532         struct inode *inode = &ip->i_inode;
 533         unsigned long nrpages;
 534
 535         if (ip == NULL)
 536                 return;
 537
 538         xa_lock_irq(&inode->i_data.i_pages);
 539         nrpages = inode->i_data.nrpages;
 540         xa_unlock_irq(&inode->i_data.i_pages);
 541
 542         gfs2_print_dbg(seq, "%s I: n:%llu/%llu t:%u f:0x%02lx d:0x%08x s:%llu "
 543                        "p:%lu\n", fs_id_buf,
 544                   (unsigned long long)ip->i_no_formal_ino,
 545                   (unsigned long long)ip->i_no_addr,
 546                   IF2DT(ip->i_inode.i_mode), ip->i_flags,
 547                   (unsigned int)ip->i_diskflags,
 548                   (unsigned long long)i_size_read(inode), nrpages);
 549 }
 550
 551 /**
 552  * freeze_go_sync - promote/demote the freeze glock
 553  * @gl: the glock
 554  */
 555
 556 static int freeze_go_sync(struct gfs2_glock *gl)
 557 {
 558         int error = 0;
 559         struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
 560
 561         /*
 562          * We need to check gl_state == LM_ST_SHARED here and not gl_req ==
 563          * LM_ST_EXCLUSIVE. That's because when any node does a freeze,
 564          * all the nodes should have the freeze glock in SH mode and they all
 565          * call do_xmote: One for EX and the others for UN. They ALL must
 566          * freeze locally, and they ALL must queue freeze work. The freeze_work
 567          * calls freeze_func, which tries to reacquire the freeze glock in SH,
 568          * effectively waiting for the thaw on the node who holds it in EX.
 569          * Once thawed, the work func acquires the freeze glock in
 570          * SH and everybody goes back to thawed.
 571          */
 572         if (gl->gl_state == LM_ST_SHARED && !gfs2_withdrawn(sdp) &&
 573             !test_bit(SDF_NORECOVERY, &sdp->sd_flags)) {
 574                 atomic_set(&sdp->sd_freeze_state, SFS_STARTING_FREEZE);
 575                 error = freeze_super(sdp->sd_vfs);
 576                 if (error) {
 577                         fs_info(sdp, "GFS2: couldn't freeze filesystem: %d\n",
 578                                 error);
 579                         if (gfs2_withdrawn(sdp)) {
 580                                 atomic_set(&sdp->sd_freeze_state, SFS_UNFROZEN);
 581                                 return 0;
 582                         }
 583                         gfs2_assert_withdraw(sdp, 0);
 584                 }
 585                 queue_work(gfs2_freeze_wq, &sdp->sd_freeze_work);
 586                 if (test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags))
 587                         gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_FREEZE |
 588                                        GFS2_LFC_FREEZE_GO_SYNC);
 589                 else /* read-only mounts */
 590                         atomic_set(&sdp->sd_freeze_state, SFS_FROZEN);
 591         }
 592         return 0;
 593 }
 594
 595 /**
 596  * freeze_go_xmote_bh - After promoting/demoting the freeze glock
 597  * @gl: the glock
 598  */
 599 static int freeze_go_xmote_bh(struct gfs2_glock *gl)
 600 {
 601         struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
 602         struct gfs2_inode *ip = GFS2_I(sdp->sd_jdesc->jd_inode);
 603         struct gfs2_glock *j_gl = ip->i_gl;
 604         struct gfs2_log_header_host head;
 605         int error;
 606
 607         if (test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
 608                 j_gl->gl_ops->go_inval(j_gl, DIO_METADATA);
 609
 610                 error = gfs2_find_jhead(sdp->sd_jdesc, &head, false);
 611                 if (gfs2_assert_withdraw_delayed(sdp, !error))
 612                         return error;
 613                 if (gfs2_assert_withdraw_delayed(sdp, head.lh_flags &
 614                                                  GFS2_LOG_HEAD_UNMOUNT))
 615                         return -EIO;
 616                 sdp->sd_log_sequence = head.lh_sequence + 1;
 617                 gfs2_log_pointers_init(sdp, head.lh_blkno);
 618         }
 619         return 0;
 620 }
 621
 622 /**
 623  * freeze_go_demote_ok
 624  * @gl: the glock
 625  *
 626  * Always returns 0
 627  */
 628
 629 static int freeze_go_demote_ok(const struct gfs2_glock *gl)
 630 {
 631         return 0;
 632 }
 633
 634 /**
 635  * iopen_go_callback - schedule the dcache entry for the inode to be deleted
 636  * @gl: the glock
 637  * @remote: true if this came from a different cluster node
 638  *
 639  * gl_lockref.lock lock is held while calling this
 640  */
 641 static void iopen_go_callback(struct gfs2_glock *gl, bool remote)
 642 {
 643         struct gfs2_inode *ip = gl->gl_object;
 644         struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
 645
 646         if (!remote || sb_rdonly(sdp->sd_vfs))
 647                 return;
 648
 649         if (gl->gl_demote_state == LM_ST_UNLOCKED &&
 650             gl->gl_state == LM_ST_SHARED && ip) {
 651                 gl->gl_lockref.count++;
 652                 if (!queue_delayed_work(gfs2_delete_workqueue,
 653                                         &gl->gl_delete, 0))
 654                         gl->gl_lockref.count--;
 655         }
 656 }
 657
 658 static int iopen_go_demote_ok(const struct gfs2_glock *gl)
 659 {
 660        return !gfs2_delete_work_queued(gl);
 661 }
 662
 663 /**
 664  * inode_go_free - wake up anyone waiting for dlm's unlock ast to free it
 665  * @gl: glock being freed
 666  *
 667  * For now, this is only used for the journal inode glock. In withdraw
 668  * situations, we need to wait for the glock to be freed so that we know
 669  * other nodes may proceed with recovery / journal replay.
 670  */
 671 static void inode_go_free(struct gfs2_glock *gl)
 672 {
 673         /* Note that we cannot reference gl_object because it's already set
 674          * to NULL by this point in its lifecycle. */
 675         if (!test_bit(GLF_FREEING, &gl->gl_flags))
 676                 return;
 677         clear_bit_unlock(GLF_FREEING, &gl->gl_flags);
 678         wake_up_bit(&gl->gl_flags, GLF_FREEING);
 679 }
 680
 681 /**
 682  * nondisk_go_callback - used to signal when a node did a withdraw
 683  * @gl: the nondisk glock
 684  * @remote: true if this came from a different cluster node
 685  *
 686  */
 687 static void nondisk_go_callback(struct gfs2_glock *gl, bool remote)
 688 {
 689         struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
 690
 691         /* Ignore the callback unless it's from another node, and it's the
 692            live lock. */
 693         if (!remote || gl->gl_name.ln_number != GFS2_LIVE_LOCK)
 694                 return;
 695
 696         /* First order of business is to cancel the demote request. We don't
 697          * really want to demote a nondisk glock. At best it's just to inform
 698          * us of another node's withdraw. We'll keep it in SH mode. */
 699         clear_bit(GLF_DEMOTE, &gl->gl_flags);
 700         clear_bit(GLF_PENDING_DEMOTE, &gl->gl_flags);
 701
 702         /* Ignore the unlock if we're withdrawn, unmounting, or in recovery. */
 703         if (test_bit(SDF_NORECOVERY, &sdp->sd_flags) ||
 704             test_bit(SDF_WITHDRAWN, &sdp->sd_flags) ||
 705             test_bit(SDF_REMOTE_WITHDRAW, &sdp->sd_flags))
 706                 return;
 707
 708         /* We only care when a node wants us to unlock, because that means
 709          * they want a journal recovered. */
 710         if (gl->gl_demote_state != LM_ST_UNLOCKED)
 711                 return;
 712
 713         if (sdp->sd_args.ar_spectator) {
 714                 fs_warn(sdp, "Spectator node cannot recover journals.\n");
 715                 return;
 716         }
 717
 718         fs_warn(sdp, "Some node has withdrawn; checking for recovery.\n");
 719         set_bit(SDF_REMOTE_WITHDRAW, &sdp->sd_flags);
 720         /*
 721          * We can't call remote_withdraw directly here or gfs2_recover_journal
 722          * because this is called from the glock unlock function and the
 723          * remote_withdraw needs to enqueue and dequeue the same "live" glock
 724          * we were called from. So we queue it to the control work queue in
 725          * lock_dlm.
 726          */
 727         queue_delayed_work(gfs2_control_wq, &sdp->sd_control_work, 0);
 728 }
 729
 730 const struct gfs2_glock_operations gfs2_meta_glops = {
 731         .go_type = LM_TYPE_META,
 732         .go_flags = GLOF_NONDISK,
 733 };
 734
 735 const struct gfs2_glock_operations gfs2_inode_glops = {
 736         .go_sync = inode_go_sync,
 737         .go_inval = inode_go_inval,
 738         .go_demote_ok = inode_go_demote_ok,
 739         .go_instantiate = inode_go_instantiate,
 740         .go_dump = inode_go_dump,
 741         .go_type = LM_TYPE_INODE,
 742         .go_flags = GLOF_ASPACE | GLOF_LRU | GLOF_LVB,
 743         .go_free = inode_go_free,
 744 };
 745
 746 const struct gfs2_glock_operations gfs2_rgrp_glops = {
 747         .go_sync = rgrp_go_sync,
 748         .go_inval = rgrp_go_inval,
 749         .go_instantiate = gfs2_rgrp_go_instantiate,
 750         .go_dump = gfs2_rgrp_go_dump,
 751         .go_type = LM_TYPE_RGRP,
 752         .go_flags = GLOF_LVB,
 753 };
 754
 755 const struct gfs2_glock_operations gfs2_freeze_glops = {
 756         .go_sync = freeze_go_sync,
 757         .go_xmote_bh = freeze_go_xmote_bh,
 758         .go_demote_ok = freeze_go_demote_ok,
 759         .go_type = LM_TYPE_NONDISK,
 760         .go_flags = GLOF_NONDISK,
 761 };
 762
 763 const struct gfs2_glock_operations gfs2_iopen_glops = {
 764         .go_type = LM_TYPE_IOPEN,
 765         .go_callback = iopen_go_callback,
 766         .go_dump = inode_go_dump,
 767         .go_demote_ok = iopen_go_demote_ok,
 768         .go_flags = GLOF_LRU | GLOF_NONDISK,
 769         .go_subclass = 1,
 770 };
 771
 772 const struct gfs2_glock_operations gfs2_flock_glops = {
 773         .go_type = LM_TYPE_FLOCK,
 774         .go_flags = GLOF_LRU | GLOF_NONDISK,
 775 };
 776
 777 const struct gfs2_glock_operations gfs2_nondisk_glops = {
 778         .go_type = LM_TYPE_NONDISK,
 779         .go_flags = GLOF_NONDISK,
 780         .go_callback = nondisk_go_callback,
 781 };
 782
 783 const struct gfs2_glock_operations gfs2_quota_glops = {
 784         .go_type = LM_TYPE_QUOTA,
 785         .go_flags = GLOF_LVB | GLOF_LRU | GLOF_NONDISK,
 786 };
 787
 788 const struct gfs2_glock_operations gfs2_journal_glops = {
 789         .go_type = LM_TYPE_JOURNAL,
 790         .go_flags = GLOF_NONDISK,
 791 };
 792
 793 const struct gfs2_glock_operations *gfs2_glops_list[] = {
 794         [LM_TYPE_META] = &gfs2_meta_glops,
 795         [LM_TYPE_INODE] = &gfs2_inode_glops,
 796         [LM_TYPE_RGRP] = &gfs2_rgrp_glops,
 797         [LM_TYPE_IOPEN] = &gfs2_iopen_glops,
 798         [LM_TYPE_FLOCK] = &gfs2_flock_glops,
 799         [LM_TYPE_NONDISK] = &gfs2_nondisk_glops,
 800         [LM_TYPE_QUOTA] = &gfs2_quota_glops,
 801         [LM_TYPE_JOURNAL] = &gfs2_journal_glops,
 802 };
 803