Merge remote-tracking branch 'spi/for-5.14' into spi-next
[linux-2.6-microblaze.git] / 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  * @nr_revokes: Number of buffers to revoke
53  *
54  * None of the buffers should be dirty, locked, or pinned.
55  */
56
57 static void __gfs2_ail_flush(struct gfs2_glock *gl, bool fsync,
58                              unsigned int nr_revokes)
59 {
60         struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
61         struct list_head *head = &gl->gl_ail_list;
62         struct gfs2_bufdata *bd, *tmp;
63         struct buffer_head *bh;
64         const unsigned long b_state = (1UL << BH_Dirty)|(1UL << BH_Pinned)|(1UL << BH_Lock);
65
66         gfs2_log_lock(sdp);
67         spin_lock(&sdp->sd_ail_lock);
68         list_for_each_entry_safe_reverse(bd, tmp, head, bd_ail_gl_list) {
69                 if (nr_revokes == 0)
70                         break;
71                 bh = bd->bd_bh;
72                 if (bh->b_state & b_state) {
73                         if (fsync)
74                                 continue;
75                         gfs2_ail_error(gl, bh);
76                 }
77                 gfs2_trans_add_revoke(sdp, bd);
78                 nr_revokes--;
79         }
80         GLOCK_BUG_ON(gl, !fsync && atomic_read(&gl->gl_ail_count));
81         spin_unlock(&sdp->sd_ail_lock);
82         gfs2_log_unlock(sdp);
83 }
84
85
86 static int gfs2_ail_empty_gl(struct gfs2_glock *gl)
87 {
88         struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
89         struct gfs2_trans tr;
90         unsigned int revokes;
91         int ret;
92
93         revokes = atomic_read(&gl->gl_ail_count);
94
95         if (!revokes) {
96                 bool have_revokes;
97                 bool log_in_flight;
98
99                 /*
100                  * We have nothing on the ail, but there could be revokes on
101                  * the sdp revoke queue, in which case, we still want to flush
102                  * the log and wait for it to finish.
103                  *
104                  * If the sdp revoke list is empty too, we might still have an
105                  * io outstanding for writing revokes, so we should wait for
106                  * it before returning.
107                  *
108                  * If none of these conditions are true, our revokes are all
109                  * flushed and we can return.
110                  */
111                 gfs2_log_lock(sdp);
112                 have_revokes = !list_empty(&sdp->sd_log_revokes);
113                 log_in_flight = atomic_read(&sdp->sd_log_in_flight);
114                 gfs2_log_unlock(sdp);
115                 if (have_revokes)
116                         goto flush;
117                 if (log_in_flight)
118                         log_flush_wait(sdp);
119                 return 0;
120         }
121
122         memset(&tr, 0, sizeof(tr));
123         set_bit(TR_ONSTACK, &tr.tr_flags);
124         ret = __gfs2_trans_begin(&tr, sdp, 0, revokes, _RET_IP_);
125         if (ret)
126                 goto flush;
127         __gfs2_ail_flush(gl, 0, revokes);
128         gfs2_trans_end(sdp);
129
130 flush:
131         gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_NORMAL |
132                        GFS2_LFC_AIL_EMPTY_GL);
133         return 0;
134 }
135
136 void gfs2_ail_flush(struct gfs2_glock *gl, bool fsync)
137 {
138         struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
139         unsigned int revokes = atomic_read(&gl->gl_ail_count);
140         int ret;
141
142         if (!revokes)
143                 return;
144
145         ret = gfs2_trans_begin(sdp, 0, revokes);
146         if (ret)
147                 return;
148         __gfs2_ail_flush(gl, fsync, revokes);
149         gfs2_trans_end(sdp);
150         gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_NORMAL |
151                        GFS2_LFC_AIL_FLUSH);
152 }
153
154 /**
155  * gfs2_rgrp_metasync - sync out the metadata of a resource group
156  * @gl: the glock protecting the resource group
157  *
158  */
159
160 static int gfs2_rgrp_metasync(struct gfs2_glock *gl)
161 {
162         struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
163         struct address_space *metamapping = &sdp->sd_aspace;
164         struct gfs2_rgrpd *rgd = gfs2_glock2rgrp(gl);
165         const unsigned bsize = sdp->sd_sb.sb_bsize;
166         loff_t start = (rgd->rd_addr * bsize) & PAGE_MASK;
167         loff_t end = PAGE_ALIGN((rgd->rd_addr + rgd->rd_length) * bsize) - 1;
168         int error;
169
170         filemap_fdatawrite_range(metamapping, start, end);
171         error = filemap_fdatawait_range(metamapping, start, end);
172         WARN_ON_ONCE(error && !gfs2_withdrawn(sdp));
173         mapping_set_error(metamapping, error);
174         if (error)
175                 gfs2_io_error(sdp);
176         return error;
177 }
178
179 /**
180  * rgrp_go_sync - sync out the metadata for this glock
181  * @gl: the glock
182  *
183  * Called when demoting or unlocking an EX glock.  We must flush
184  * to disk all dirty buffers/pages relating to this glock, and must not
185  * return to caller to demote/unlock the glock until I/O is complete.
186  */
187
188 static int rgrp_go_sync(struct gfs2_glock *gl)
189 {
190         struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
191         struct gfs2_rgrpd *rgd = gfs2_glock2rgrp(gl);
192         int error;
193
194         if (!test_and_clear_bit(GLF_DIRTY, &gl->gl_flags))
195                 return 0;
196         GLOCK_BUG_ON(gl, gl->gl_state != LM_ST_EXCLUSIVE);
197
198         gfs2_log_flush(sdp, gl, GFS2_LOG_HEAD_FLUSH_NORMAL |
199                        GFS2_LFC_RGRP_GO_SYNC);
200         error = gfs2_rgrp_metasync(gl);
201         if (!error)
202                 error = gfs2_ail_empty_gl(gl);
203         gfs2_free_clones(rgd);
204         return error;
205 }
206
207 /**
208  * rgrp_go_inval - invalidate the metadata for this glock
209  * @gl: the glock
210  * @flags:
211  *
212  * We never used LM_ST_DEFERRED with resource groups, so that we
213  * should always see the metadata flag set here.
214  *
215  */
216
217 static void rgrp_go_inval(struct gfs2_glock *gl, int flags)
218 {
219         struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
220         struct address_space *mapping = &sdp->sd_aspace;
221         struct gfs2_rgrpd *rgd = gfs2_glock2rgrp(gl);
222         const unsigned bsize = sdp->sd_sb.sb_bsize;
223         loff_t start = (rgd->rd_addr * bsize) & PAGE_MASK;
224         loff_t end = PAGE_ALIGN((rgd->rd_addr + rgd->rd_length) * bsize) - 1;
225
226         gfs2_rgrp_brelse(rgd);
227         WARN_ON_ONCE(!(flags & DIO_METADATA));
228         truncate_inode_pages_range(mapping, start, end);
229         rgd->rd_flags &= ~GFS2_RDF_UPTODATE;
230 }
231
232 static void gfs2_rgrp_go_dump(struct seq_file *seq, struct gfs2_glock *gl,
233                               const char *fs_id_buf)
234 {
235         struct gfs2_rgrpd *rgd = gl->gl_object;
236
237         if (rgd)
238                 gfs2_rgrp_dump(seq, rgd, fs_id_buf);
239 }
240
241 static struct gfs2_inode *gfs2_glock2inode(struct gfs2_glock *gl)
242 {
243         struct gfs2_inode *ip;
244
245         spin_lock(&gl->gl_lockref.lock);
246         ip = gl->gl_object;
247         if (ip)
248                 set_bit(GIF_GLOP_PENDING, &ip->i_flags);
249         spin_unlock(&gl->gl_lockref.lock);
250         return ip;
251 }
252
253 struct gfs2_rgrpd *gfs2_glock2rgrp(struct gfs2_glock *gl)
254 {
255         struct gfs2_rgrpd *rgd;
256
257         spin_lock(&gl->gl_lockref.lock);
258         rgd = gl->gl_object;
259         spin_unlock(&gl->gl_lockref.lock);
260
261         return rgd;
262 }
263
264 static void gfs2_clear_glop_pending(struct gfs2_inode *ip)
265 {
266         if (!ip)
267                 return;
268
269         clear_bit_unlock(GIF_GLOP_PENDING, &ip->i_flags);
270         wake_up_bit(&ip->i_flags, GIF_GLOP_PENDING);
271 }
272
273 /**
274  * gfs2_inode_metasync - sync out the metadata of an inode
275  * @gl: the glock protecting the inode
276  *
277  */
278 int gfs2_inode_metasync(struct gfs2_glock *gl)
279 {
280         struct address_space *metamapping = gfs2_glock2aspace(gl);
281         int error;
282
283         filemap_fdatawrite(metamapping);
284         error = filemap_fdatawait(metamapping);
285         if (error)
286                 gfs2_io_error(gl->gl_name.ln_sbd);
287         return error;
288 }
289
290 /**
291  * inode_go_sync - Sync the dirty metadata of an inode
292  * @gl: the glock protecting the inode
293  *
294  */
295
296 static int inode_go_sync(struct gfs2_glock *gl)
297 {
298         struct gfs2_inode *ip = gfs2_glock2inode(gl);
299         int isreg = ip && S_ISREG(ip->i_inode.i_mode);
300         struct address_space *metamapping = gfs2_glock2aspace(gl);
301         int error = 0, ret;
302
303         if (isreg) {
304                 if (test_and_clear_bit(GIF_SW_PAGED, &ip->i_flags))
305                         unmap_shared_mapping_range(ip->i_inode.i_mapping, 0, 0);
306                 inode_dio_wait(&ip->i_inode);
307         }
308         if (!test_and_clear_bit(GLF_DIRTY, &gl->gl_flags))
309                 goto out;
310
311         GLOCK_BUG_ON(gl, gl->gl_state != LM_ST_EXCLUSIVE);
312
313         gfs2_log_flush(gl->gl_name.ln_sbd, gl, GFS2_LOG_HEAD_FLUSH_NORMAL |
314                        GFS2_LFC_INODE_GO_SYNC);
315         filemap_fdatawrite(metamapping);
316         if (isreg) {
317                 struct address_space *mapping = ip->i_inode.i_mapping;
318                 filemap_fdatawrite(mapping);
319                 error = filemap_fdatawait(mapping);
320                 mapping_set_error(mapping, error);
321         }
322         ret = gfs2_inode_metasync(gl);
323         if (!error)
324                 error = ret;
325         gfs2_ail_empty_gl(gl);
326         /*
327          * Writeback of the data mapping may cause the dirty flag to be set
328          * so we have to clear it again here.
329          */
330         smp_mb__before_atomic();
331         clear_bit(GLF_DIRTY, &gl->gl_flags);
332
333 out:
334         gfs2_clear_glop_pending(ip);
335         return error;
336 }
337
338 /**
339  * inode_go_inval - prepare a inode glock to be released
340  * @gl: the glock
341  * @flags:
342  *
343  * Normally we invalidate everything, but if we are moving into
344  * LM_ST_DEFERRED from LM_ST_SHARED or LM_ST_EXCLUSIVE then we
345  * can keep hold of the metadata, since it won't have changed.
346  *
347  */
348
349 static void inode_go_inval(struct gfs2_glock *gl, int flags)
350 {
351         struct gfs2_inode *ip = gfs2_glock2inode(gl);
352
353         if (flags & DIO_METADATA) {
354                 struct address_space *mapping = gfs2_glock2aspace(gl);
355                 truncate_inode_pages(mapping, 0);
356                 if (ip) {
357                         set_bit(GIF_INVALID, &ip->i_flags);
358                         forget_all_cached_acls(&ip->i_inode);
359                         security_inode_invalidate_secctx(&ip->i_inode);
360                         gfs2_dir_hash_inval(ip);
361                 }
362         }
363
364         if (ip == GFS2_I(gl->gl_name.ln_sbd->sd_rindex)) {
365                 gfs2_log_flush(gl->gl_name.ln_sbd, NULL,
366                                GFS2_LOG_HEAD_FLUSH_NORMAL |
367                                GFS2_LFC_INODE_GO_INVAL);
368                 gl->gl_name.ln_sbd->sd_rindex_uptodate = 0;
369         }
370         if (ip && S_ISREG(ip->i_inode.i_mode))
371                 truncate_inode_pages(ip->i_inode.i_mapping, 0);
372
373         gfs2_clear_glop_pending(ip);
374 }
375
376 /**
377  * inode_go_demote_ok - Check to see if it's ok to unlock an inode glock
378  * @gl: the glock
379  *
380  * Returns: 1 if it's ok
381  */
382
383 static int inode_go_demote_ok(const struct gfs2_glock *gl)
384 {
385         struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
386
387         if (sdp->sd_jindex == gl->gl_object || sdp->sd_rindex == gl->gl_object)
388                 return 0;
389
390         return 1;
391 }
392
393 static int gfs2_dinode_in(struct gfs2_inode *ip, const void *buf)
394 {
395         const struct gfs2_dinode *str = buf;
396         struct timespec64 atime;
397         u16 height, depth;
398         umode_t mode = be32_to_cpu(str->di_mode);
399         bool is_new = ip->i_inode.i_state & I_NEW;
400
401         if (unlikely(ip->i_no_addr != be64_to_cpu(str->di_num.no_addr)))
402                 goto corrupt;
403         if (unlikely(!is_new && inode_wrong_type(&ip->i_inode, mode)))
404                 goto corrupt;
405         ip->i_no_formal_ino = be64_to_cpu(str->di_num.no_formal_ino);
406         ip->i_inode.i_mode = mode;
407         if (is_new) {
408                 ip->i_inode.i_rdev = 0;
409                 switch (mode & S_IFMT) {
410                 case S_IFBLK:
411                 case S_IFCHR:
412                         ip->i_inode.i_rdev = MKDEV(be32_to_cpu(str->di_major),
413                                                    be32_to_cpu(str->di_minor));
414                         break;
415                 }
416         }
417
418         i_uid_write(&ip->i_inode, be32_to_cpu(str->di_uid));
419         i_gid_write(&ip->i_inode, be32_to_cpu(str->di_gid));
420         set_nlink(&ip->i_inode, be32_to_cpu(str->di_nlink));
421         i_size_write(&ip->i_inode, be64_to_cpu(str->di_size));
422         gfs2_set_inode_blocks(&ip->i_inode, be64_to_cpu(str->di_blocks));
423         atime.tv_sec = be64_to_cpu(str->di_atime);
424         atime.tv_nsec = be32_to_cpu(str->di_atime_nsec);
425         if (timespec64_compare(&ip->i_inode.i_atime, &atime) < 0)
426                 ip->i_inode.i_atime = atime;
427         ip->i_inode.i_mtime.tv_sec = be64_to_cpu(str->di_mtime);
428         ip->i_inode.i_mtime.tv_nsec = be32_to_cpu(str->di_mtime_nsec);
429         ip->i_inode.i_ctime.tv_sec = be64_to_cpu(str->di_ctime);
430         ip->i_inode.i_ctime.tv_nsec = be32_to_cpu(str->di_ctime_nsec);
431
432         ip->i_goal = be64_to_cpu(str->di_goal_meta);
433         ip->i_generation = be64_to_cpu(str->di_generation);
434
435         ip->i_diskflags = be32_to_cpu(str->di_flags);
436         ip->i_eattr = be64_to_cpu(str->di_eattr);
437         /* i_diskflags and i_eattr must be set before gfs2_set_inode_flags() */
438         gfs2_set_inode_flags(&ip->i_inode);
439         height = be16_to_cpu(str->di_height);
440         if (unlikely(height > GFS2_MAX_META_HEIGHT))
441                 goto corrupt;
442         ip->i_height = (u8)height;
443
444         depth = be16_to_cpu(str->di_depth);
445         if (unlikely(depth > GFS2_DIR_MAX_DEPTH))
446                 goto corrupt;
447         ip->i_depth = (u8)depth;
448         ip->i_entries = be32_to_cpu(str->di_entries);
449
450         if (S_ISREG(ip->i_inode.i_mode))
451                 gfs2_set_aops(&ip->i_inode);
452
453         return 0;
454 corrupt:
455         gfs2_consist_inode(ip);
456         return -EIO;
457 }
458
459 /**
460  * gfs2_inode_refresh - Refresh the incore copy of the dinode
461  * @ip: The GFS2 inode
462  *
463  * Returns: errno
464  */
465
466 int gfs2_inode_refresh(struct gfs2_inode *ip)
467 {
468         struct buffer_head *dibh;
469         int error;
470
471         error = gfs2_meta_inode_buffer(ip, &dibh);
472         if (error)
473                 return error;
474
475         error = gfs2_dinode_in(ip, dibh->b_data);
476         brelse(dibh);
477         clear_bit(GIF_INVALID, &ip->i_flags);
478
479         return error;
480 }
481
482 /**
483  * inode_go_lock - operation done after an inode lock is locked by a process
484  * @gh: The glock holder
485  *
486  * Returns: errno
487  */
488
489 static int inode_go_lock(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 || (gh->gh_flags & GL_SKIP))
497                 return 0;
498
499         if (test_bit(GIF_INVALID, &ip->i_flags)) {
500                 error = gfs2_inode_refresh(ip);
501                 if (error)
502                         return error;
503         }
504
505         if (gh->gh_state != LM_ST_DEFERRED)
506                 inode_dio_wait(&ip->i_inode);
507
508         if ((ip->i_diskflags & GFS2_DIF_TRUNC_IN_PROG) &&
509             (gl->gl_state == LM_ST_EXCLUSIVE) &&
510             (gh->gh_state == LM_ST_EXCLUSIVE)) {
511                 spin_lock(&sdp->sd_trunc_lock);
512                 if (list_empty(&ip->i_trunc_list))
513                         list_add(&ip->i_trunc_list, &sdp->sd_trunc_list);
514                 spin_unlock(&sdp->sd_trunc_lock);
515                 wake_up(&sdp->sd_quota_wait);
516                 return 1;
517         }
518
519         return error;
520 }
521
522 /**
523  * inode_go_dump - print information about an inode
524  * @seq: The iterator
525  * @gl: The glock
526  * @fs_id_buf: file system id (may be empty)
527  *
528  */
529
530 static void inode_go_dump(struct seq_file *seq, struct gfs2_glock *gl,
531                           const char *fs_id_buf)
532 {
533         struct gfs2_inode *ip = gl->gl_object;
534         struct inode *inode = &ip->i_inode;
535         unsigned long nrpages;
536
537         if (ip == NULL)
538                 return;
539
540         xa_lock_irq(&inode->i_data.i_pages);
541         nrpages = inode->i_data.nrpages;
542         xa_unlock_irq(&inode->i_data.i_pages);
543
544         gfs2_print_dbg(seq, "%s I: n:%llu/%llu t:%u f:0x%02lx d:0x%08x s:%llu "
545                        "p:%lu\n", fs_id_buf,
546                   (unsigned long long)ip->i_no_formal_ino,
547                   (unsigned long long)ip->i_no_addr,
548                   IF2DT(ip->i_inode.i_mode), ip->i_flags,
549                   (unsigned int)ip->i_diskflags,
550                   (unsigned long long)i_size_read(inode), nrpages);
551 }
552
553 /**
554  * freeze_go_sync - promote/demote the freeze glock
555  * @gl: the glock
556  */
557
558 static int freeze_go_sync(struct gfs2_glock *gl)
559 {
560         int error = 0;
561         struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
562
563         /*
564          * We need to check gl_state == LM_ST_SHARED here and not gl_req ==
565          * LM_ST_EXCLUSIVE. That's because when any node does a freeze,
566          * all the nodes should have the freeze glock in SH mode and they all
567          * call do_xmote: One for EX and the others for UN. They ALL must
568          * freeze locally, and they ALL must queue freeze work. The freeze_work
569          * calls freeze_func, which tries to reacquire the freeze glock in SH,
570          * effectively waiting for the thaw on the node who holds it in EX.
571          * Once thawed, the work func acquires the freeze glock in
572          * SH and everybody goes back to thawed.
573          */
574         if (gl->gl_state == LM_ST_SHARED && !gfs2_withdrawn(sdp) &&
575             !test_bit(SDF_NORECOVERY, &sdp->sd_flags)) {
576                 atomic_set(&sdp->sd_freeze_state, SFS_STARTING_FREEZE);
577                 error = freeze_super(sdp->sd_vfs);
578                 if (error) {
579                         fs_info(sdp, "GFS2: couldn't freeze filesystem: %d\n",
580                                 error);
581                         if (gfs2_withdrawn(sdp)) {
582                                 atomic_set(&sdp->sd_freeze_state, SFS_UNFROZEN);
583                                 return 0;
584                         }
585                         gfs2_assert_withdraw(sdp, 0);
586                 }
587                 queue_work(gfs2_freeze_wq, &sdp->sd_freeze_work);
588                 if (test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags))
589                         gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_FREEZE |
590                                        GFS2_LFC_FREEZE_GO_SYNC);
591                 else /* read-only mounts */
592                         atomic_set(&sdp->sd_freeze_state, SFS_FROZEN);
593         }
594         return 0;
595 }
596
597 /**
598  * freeze_go_xmote_bh - After promoting/demoting the freeze glock
599  * @gl: the glock
600  */
601 static int freeze_go_xmote_bh(struct gfs2_glock *gl)
602 {
603         struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
604         struct gfs2_inode *ip = GFS2_I(sdp->sd_jdesc->jd_inode);
605         struct gfs2_glock *j_gl = ip->i_gl;
606         struct gfs2_log_header_host head;
607         int error;
608
609         if (test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
610                 j_gl->gl_ops->go_inval(j_gl, DIO_METADATA);
611
612                 error = gfs2_find_jhead(sdp->sd_jdesc, &head, false);
613                 if (error)
614                         gfs2_consist(sdp);
615                 if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT))
616                         gfs2_consist(sdp);
617
618                 /*  Initialize some head of the log stuff  */
619                 if (!gfs2_withdrawn(sdp)) {
620                         sdp->sd_log_sequence = head.lh_sequence + 1;
621                         gfs2_log_pointers_init(sdp, head.lh_blkno);
622                 }
623         }
624         return 0;
625 }
626
627 /**
628  * freeze_go_demote_ok
629  * @gl: the glock
630  *
631  * Always returns 0
632  */
633
634 static int freeze_go_demote_ok(const struct gfs2_glock *gl)
635 {
636         return 0;
637 }
638
639 /**
640  * iopen_go_callback - schedule the dcache entry for the inode to be deleted
641  * @gl: the glock
642  * @remote: true if this came from a different cluster node
643  *
644  * gl_lockref.lock lock is held while calling this
645  */
646 static void iopen_go_callback(struct gfs2_glock *gl, bool remote)
647 {
648         struct gfs2_inode *ip = gl->gl_object;
649         struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
650
651         if (!remote || sb_rdonly(sdp->sd_vfs))
652                 return;
653
654         if (gl->gl_demote_state == LM_ST_UNLOCKED &&
655             gl->gl_state == LM_ST_SHARED && ip) {
656                 gl->gl_lockref.count++;
657                 if (!queue_delayed_work(gfs2_delete_workqueue,
658                                         &gl->gl_delete, 0))
659                         gl->gl_lockref.count--;
660         }
661 }
662
663 static int iopen_go_demote_ok(const struct gfs2_glock *gl)
664 {
665        return !gfs2_delete_work_queued(gl);
666 }
667
668 /**
669  * inode_go_free - wake up anyone waiting for dlm's unlock ast to free it
670  * @gl: glock being freed
671  *
672  * For now, this is only used for the journal inode glock. In withdraw
673  * situations, we need to wait for the glock to be freed so that we know
674  * other nodes may proceed with recovery / journal replay.
675  */
676 static void inode_go_free(struct gfs2_glock *gl)
677 {
678         /* Note that we cannot reference gl_object because it's already set
679          * to NULL by this point in its lifecycle. */
680         if (!test_bit(GLF_FREEING, &gl->gl_flags))
681                 return;
682         clear_bit_unlock(GLF_FREEING, &gl->gl_flags);
683         wake_up_bit(&gl->gl_flags, GLF_FREEING);
684 }
685
686 /**
687  * nondisk_go_callback - used to signal when a node did a withdraw
688  * @gl: the nondisk glock
689  * @remote: true if this came from a different cluster node
690  *
691  */
692 static void nondisk_go_callback(struct gfs2_glock *gl, bool remote)
693 {
694         struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
695
696         /* Ignore the callback unless it's from another node, and it's the
697            live lock. */
698         if (!remote || gl->gl_name.ln_number != GFS2_LIVE_LOCK)
699                 return;
700
701         /* First order of business is to cancel the demote request. We don't
702          * really want to demote a nondisk glock. At best it's just to inform
703          * us of another node's withdraw. We'll keep it in SH mode. */
704         clear_bit(GLF_DEMOTE, &gl->gl_flags);
705         clear_bit(GLF_PENDING_DEMOTE, &gl->gl_flags);
706
707         /* Ignore the unlock if we're withdrawn, unmounting, or in recovery. */
708         if (test_bit(SDF_NORECOVERY, &sdp->sd_flags) ||
709             test_bit(SDF_WITHDRAWN, &sdp->sd_flags) ||
710             test_bit(SDF_REMOTE_WITHDRAW, &sdp->sd_flags))
711                 return;
712
713         /* We only care when a node wants us to unlock, because that means
714          * they want a journal recovered. */
715         if (gl->gl_demote_state != LM_ST_UNLOCKED)
716                 return;
717
718         if (sdp->sd_args.ar_spectator) {
719                 fs_warn(sdp, "Spectator node cannot recover journals.\n");
720                 return;
721         }
722
723         fs_warn(sdp, "Some node has withdrawn; checking for recovery.\n");
724         set_bit(SDF_REMOTE_WITHDRAW, &sdp->sd_flags);
725         /*
726          * We can't call remote_withdraw directly here or gfs2_recover_journal
727          * because this is called from the glock unlock function and the
728          * remote_withdraw needs to enqueue and dequeue the same "live" glock
729          * we were called from. So we queue it to the control work queue in
730          * lock_dlm.
731          */
732         queue_delayed_work(gfs2_control_wq, &sdp->sd_control_work, 0);
733 }
734
735 const struct gfs2_glock_operations gfs2_meta_glops = {
736         .go_type = LM_TYPE_META,
737         .go_flags = GLOF_NONDISK,
738 };
739
740 const struct gfs2_glock_operations gfs2_inode_glops = {
741         .go_sync = inode_go_sync,
742         .go_inval = inode_go_inval,
743         .go_demote_ok = inode_go_demote_ok,
744         .go_lock = inode_go_lock,
745         .go_dump = inode_go_dump,
746         .go_type = LM_TYPE_INODE,
747         .go_flags = GLOF_ASPACE | GLOF_LRU | GLOF_LVB,
748         .go_free = inode_go_free,
749 };
750
751 const struct gfs2_glock_operations gfs2_rgrp_glops = {
752         .go_sync = rgrp_go_sync,
753         .go_inval = rgrp_go_inval,
754         .go_lock = gfs2_rgrp_go_lock,
755         .go_dump = gfs2_rgrp_go_dump,
756         .go_type = LM_TYPE_RGRP,
757         .go_flags = GLOF_LVB,
758 };
759
760 const struct gfs2_glock_operations gfs2_freeze_glops = {
761         .go_sync = freeze_go_sync,
762         .go_xmote_bh = freeze_go_xmote_bh,
763         .go_demote_ok = freeze_go_demote_ok,
764         .go_type = LM_TYPE_NONDISK,
765         .go_flags = GLOF_NONDISK,
766 };
767
768 const struct gfs2_glock_operations gfs2_iopen_glops = {
769         .go_type = LM_TYPE_IOPEN,
770         .go_callback = iopen_go_callback,
771         .go_demote_ok = iopen_go_demote_ok,
772         .go_flags = GLOF_LRU | GLOF_NONDISK,
773         .go_subclass = 1,
774 };
775
776 const struct gfs2_glock_operations gfs2_flock_glops = {
777         .go_type = LM_TYPE_FLOCK,
778         .go_flags = GLOF_LRU | GLOF_NONDISK,
779 };
780
781 const struct gfs2_glock_operations gfs2_nondisk_glops = {
782         .go_type = LM_TYPE_NONDISK,
783         .go_flags = GLOF_NONDISK,
784         .go_callback = nondisk_go_callback,
785 };
786
787 const struct gfs2_glock_operations gfs2_quota_glops = {
788         .go_type = LM_TYPE_QUOTA,
789         .go_flags = GLOF_LVB | GLOF_LRU | GLOF_NONDISK,
790 };
791
792 const struct gfs2_glock_operations gfs2_journal_glops = {
793         .go_type = LM_TYPE_JOURNAL,
794         .go_flags = GLOF_NONDISK,
795 };
796
797 const struct gfs2_glock_operations *gfs2_glops_list[] = {
798         [LM_TYPE_META] = &gfs2_meta_glops,
799         [LM_TYPE_INODE] = &gfs2_inode_glops,
800         [LM_TYPE_RGRP] = &gfs2_rgrp_glops,
801         [LM_TYPE_IOPEN] = &gfs2_iopen_glops,
802         [LM_TYPE_FLOCK] = &gfs2_flock_glops,
803         [LM_TYPE_NONDISK] = &gfs2_nondisk_glops,
804         [LM_TYPE_QUOTA] = &gfs2_quota_glops,
805         [LM_TYPE_JOURNAL] = &gfs2_journal_glops,
806 };
807