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         set_bit(GLF_INSTANTIATE_NEEDED, &gl->gl_flags);
 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(GLF_INSTANTIATE_NEEDED, &gl->gl_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         return error;
 480 }
 481
 482 /**
 483  * inode_go_instantiate - read in an inode if necessary
 484  * @gh: The glock holder
 485  *
 486  * Returns: errno
 487  */
 488
 489 static int inode_go_instantiate(struct gfs2_holder *gh)
 490 {
 491         struct gfs2_glock *gl = gh->gh_gl;
 492         struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
 493         struct gfs2_inode *ip = gl->gl_object;
 494         int error = 0;
 495
 496         if (!ip) /* no inode to populate - read it in later */
 497                 goto out;
 498
 499         error = gfs2_inode_refresh(ip);
 500         if (error)
 501                 goto out;
 502
 503         if (gh->gh_state != LM_ST_DEFERRED)
 504                 inode_dio_wait(&ip->i_inode);
 505
 506         if ((ip->i_diskflags & GFS2_DIF_TRUNC_IN_PROG) &&
 507             (gl->gl_state == LM_ST_EXCLUSIVE) &&
 508             (gh->gh_state == LM_ST_EXCLUSIVE)) {
 509                 spin_lock(&sdp->sd_trunc_lock);
 510                 if (list_empty(&ip->i_trunc_list))
 511                         list_add(&ip->i_trunc_list, &sdp->sd_trunc_list);
 512                 spin_unlock(&sdp->sd_trunc_lock);
 513                 wake_up(&sdp->sd_quota_wait);
 514                 error = 1;
 515         }
 516
 517 out:
 518         return error;
 519 }
 520
 521 /**
 522  * inode_go_dump - print information about an inode
 523  * @seq: The iterator
 524  * @gl: The glock
 525  * @fs_id_buf: file system id (may be empty)
 526  *
 527  */
 528
 529 static void inode_go_dump(struct seq_file *seq, struct gfs2_glock *gl,
 530                           const char *fs_id_buf)
 531 {
 532         struct gfs2_inode *ip = gl->gl_object;
 533         struct inode *inode = &ip->i_inode;
 534         unsigned long nrpages;
 535
 536         if (ip == NULL)
 537                 return;
 538
 539         xa_lock_irq(&inode->i_data.i_pages);
 540         nrpages = inode->i_data.nrpages;
 541         xa_unlock_irq(&inode->i_data.i_pages);
 542
 543         gfs2_print_dbg(seq, "%s I: n:%llu/%llu t:%u f:0x%02lx d:0x%08x s:%llu "
 544                        "p:%lu\n", fs_id_buf,
 545                   (unsigned long long)ip->i_no_formal_ino,
 546                   (unsigned long long)ip->i_no_addr,
 547                   IF2DT(ip->i_inode.i_mode), ip->i_flags,
 548                   (unsigned int)ip->i_diskflags,
 549                   (unsigned long long)i_size_read(inode), nrpages);
 550 }
 551
 552 /**
 553  * freeze_go_sync - promote/demote the freeze glock
 554  * @gl: the glock
 555  */
 556
 557 static int freeze_go_sync(struct gfs2_glock *gl)
 558 {
 559         int error = 0;
 560         struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
 561
 562         /*
 563          * We need to check gl_state == LM_ST_SHARED here and not gl_req ==
 564          * LM_ST_EXCLUSIVE. That's because when any node does a freeze,
 565          * all the nodes should have the freeze glock in SH mode and they all
 566          * call do_xmote: One for EX and the others for UN. They ALL must
 567          * freeze locally, and they ALL must queue freeze work. The freeze_work
 568          * calls freeze_func, which tries to reacquire the freeze glock in SH,
 569          * effectively waiting for the thaw on the node who holds it in EX.
 570          * Once thawed, the work func acquires the freeze glock in
 571          * SH and everybody goes back to thawed.
 572          */
 573         if (gl->gl_state == LM_ST_SHARED && !gfs2_withdrawn(sdp) &&
 574             !test_bit(SDF_NORECOVERY, &sdp->sd_flags)) {
 575                 atomic_set(&sdp->sd_freeze_state, SFS_STARTING_FREEZE);
 576                 error = freeze_super(sdp->sd_vfs);
 577                 if (error) {
 578                         fs_info(sdp, "GFS2: couldn't freeze filesystem: %d\n",
 579                                 error);
 580                         if (gfs2_withdrawn(sdp)) {
 581                                 atomic_set(&sdp->sd_freeze_state, SFS_UNFROZEN);
 582                                 return 0;
 583                         }
 584                         gfs2_assert_withdraw(sdp, 0);
 585                 }
 586                 queue_work(gfs2_freeze_wq, &sdp->sd_freeze_work);
 587                 if (test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags))
 588                         gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_FREEZE |
 589                                        GFS2_LFC_FREEZE_GO_SYNC);
 590                 else /* read-only mounts */
 591                         atomic_set(&sdp->sd_freeze_state, SFS_FROZEN);
 592         }
 593         return 0;
 594 }
 595
 596 /**
 597  * freeze_go_xmote_bh - After promoting/demoting the freeze glock
 598  * @gl: the glock
 599  */
 600 static int freeze_go_xmote_bh(struct gfs2_glock *gl)
 601 {
 602         struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
 603         struct gfs2_inode *ip = GFS2_I(sdp->sd_jdesc->jd_inode);
 604         struct gfs2_glock *j_gl = ip->i_gl;
 605         struct gfs2_log_header_host head;
 606         int error;
 607
 608         if (test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
 609                 j_gl->gl_ops->go_inval(j_gl, DIO_METADATA);
 610
 611                 error = gfs2_find_jhead(sdp->sd_jdesc, &head, false);
 612                 if (gfs2_assert_withdraw_delayed(sdp, !error))
 613                         return error;
 614                 if (gfs2_assert_withdraw_delayed(sdp, head.lh_flags &
 615                                                  GFS2_LOG_HEAD_UNMOUNT))
 616                         return -EIO;
 617                 sdp->sd_log_sequence = head.lh_sequence + 1;
 618                 gfs2_log_pointers_init(sdp, head.lh_blkno);
 619         }
 620         return 0;
 621 }
 622
 623 /**
 624  * freeze_go_demote_ok
 625  * @gl: the glock
 626  *
 627  * Always returns 0
 628  */
 629
 630 static int freeze_go_demote_ok(const struct gfs2_glock *gl)
 631 {
 632         return 0;
 633 }
 634
 635 /**
 636  * iopen_go_callback - schedule the dcache entry for the inode to be deleted
 637  * @gl: the glock
 638  * @remote: true if this came from a different cluster node
 639  *
 640  * gl_lockref.lock lock is held while calling this
 641  */
 642 static void iopen_go_callback(struct gfs2_glock *gl, bool remote)
 643 {
 644         struct gfs2_inode *ip = gl->gl_object;
 645         struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
 646
 647         if (!remote || sb_rdonly(sdp->sd_vfs))
 648                 return;
 649
 650         if (gl->gl_demote_state == LM_ST_UNLOCKED &&
 651             gl->gl_state == LM_ST_SHARED && ip) {
 652                 gl->gl_lockref.count++;
 653                 if (!queue_delayed_work(gfs2_delete_workqueue,
 654                                         &gl->gl_delete, 0))
 655                         gl->gl_lockref.count--;
 656         }
 657 }
 658
 659 static int iopen_go_demote_ok(const struct gfs2_glock *gl)
 660 {
 661        return !gfs2_delete_work_queued(gl);
 662 }
 663
 664 /**
 665  * inode_go_free - wake up anyone waiting for dlm's unlock ast to free it
 666  * @gl: glock being freed
 667  *
 668  * For now, this is only used for the journal inode glock. In withdraw
 669  * situations, we need to wait for the glock to be freed so that we know
 670  * other nodes may proceed with recovery / journal replay.
 671  */
 672 static void inode_go_free(struct gfs2_glock *gl)
 673 {
 674         /* Note that we cannot reference gl_object because it's already set
 675          * to NULL by this point in its lifecycle. */
 676         if (!test_bit(GLF_FREEING, &gl->gl_flags))
 677                 return;
 678         clear_bit_unlock(GLF_FREEING, &gl->gl_flags);
 679         wake_up_bit(&gl->gl_flags, GLF_FREEING);
 680 }
 681
 682 /**
 683  * nondisk_go_callback - used to signal when a node did a withdraw
 684  * @gl: the nondisk glock
 685  * @remote: true if this came from a different cluster node
 686  *
 687  */
 688 static void nondisk_go_callback(struct gfs2_glock *gl, bool remote)
 689 {
 690         struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
 691
 692         /* Ignore the callback unless it's from another node, and it's the
 693            live lock. */
 694         if (!remote || gl->gl_name.ln_number != GFS2_LIVE_LOCK)
 695                 return;
 696
 697         /* First order of business is to cancel the demote request. We don't
 698          * really want to demote a nondisk glock. At best it's just to inform
 699          * us of another node's withdraw. We'll keep it in SH mode. */
 700         clear_bit(GLF_DEMOTE, &gl->gl_flags);
 701         clear_bit(GLF_PENDING_DEMOTE, &gl->gl_flags);
 702
 703         /* Ignore the unlock if we're withdrawn, unmounting, or in recovery. */
 704         if (test_bit(SDF_NORECOVERY, &sdp->sd_flags) ||
 705             test_bit(SDF_WITHDRAWN, &sdp->sd_flags) ||
 706             test_bit(SDF_REMOTE_WITHDRAW, &sdp->sd_flags))
 707                 return;
 708
 709         /* We only care when a node wants us to unlock, because that means
 710          * they want a journal recovered. */
 711         if (gl->gl_demote_state != LM_ST_UNLOCKED)
 712                 return;
 713
 714         if (sdp->sd_args.ar_spectator) {
 715                 fs_warn(sdp, "Spectator node cannot recover journals.\n");
 716                 return;
 717         }
 718
 719         fs_warn(sdp, "Some node has withdrawn; checking for recovery.\n");
 720         set_bit(SDF_REMOTE_WITHDRAW, &sdp->sd_flags);
 721         /*
 722          * We can't call remote_withdraw directly here or gfs2_recover_journal
 723          * because this is called from the glock unlock function and the
 724          * remote_withdraw needs to enqueue and dequeue the same "live" glock
 725          * we were called from. So we queue it to the control work queue in
 726          * lock_dlm.
 727          */
 728         queue_delayed_work(gfs2_control_wq, &sdp->sd_control_work, 0);
 729 }
 730
 731 const struct gfs2_glock_operations gfs2_meta_glops = {
 732         .go_type = LM_TYPE_META,
 733         .go_flags = GLOF_NONDISK,
 734 };
 735
 736 const struct gfs2_glock_operations gfs2_inode_glops = {
 737         .go_sync = inode_go_sync,
 738         .go_inval = inode_go_inval,
 739         .go_demote_ok = inode_go_demote_ok,
 740         .go_instantiate = inode_go_instantiate,
 741         .go_dump = inode_go_dump,
 742         .go_type = LM_TYPE_INODE,
 743         .go_flags = GLOF_ASPACE | GLOF_LRU | GLOF_LVB,
 744         .go_free = inode_go_free,
 745 };
 746
 747 const struct gfs2_glock_operations gfs2_rgrp_glops = {
 748         .go_sync = rgrp_go_sync,
 749         .go_inval = rgrp_go_inval,
 750         .go_instantiate = gfs2_rgrp_go_instantiate,
 751         .go_dump = gfs2_rgrp_go_dump,
 752         .go_type = LM_TYPE_RGRP,
 753         .go_flags = GLOF_LVB,
 754 };
 755
 756 const struct gfs2_glock_operations gfs2_freeze_glops = {
 757         .go_sync = freeze_go_sync,
 758         .go_xmote_bh = freeze_go_xmote_bh,
 759         .go_demote_ok = freeze_go_demote_ok,
 760         .go_type = LM_TYPE_NONDISK,
 761         .go_flags = GLOF_NONDISK,
 762 };
 763
 764 const struct gfs2_glock_operations gfs2_iopen_glops = {
 765         .go_type = LM_TYPE_IOPEN,
 766         .go_callback = iopen_go_callback,
 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