Merge tag 'mtd/for-5.7' of git://git.kernel.org/pub/scm/linux/kernel/git/mtd/linux
[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  *
53  * None of the buffers should be dirty, locked, or pinned.
54  */
55
56 static void __gfs2_ail_flush(struct gfs2_glock *gl, bool fsync,
57                              unsigned int nr_revokes)
58 {
59         struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
60         struct list_head *head = &gl->gl_ail_list;
61         struct gfs2_bufdata *bd, *tmp;
62         struct buffer_head *bh;
63         const unsigned long b_state = (1UL << BH_Dirty)|(1UL << BH_Pinned)|(1UL << BH_Lock);
64
65         gfs2_log_lock(sdp);
66         spin_lock(&sdp->sd_ail_lock);
67         list_for_each_entry_safe_reverse(bd, tmp, head, bd_ail_gl_list) {
68                 if (nr_revokes == 0)
69                         break;
70                 bh = bd->bd_bh;
71                 if (bh->b_state & b_state) {
72                         if (fsync)
73                                 continue;
74                         gfs2_ail_error(gl, bh);
75                 }
76                 gfs2_trans_add_revoke(sdp, bd);
77                 nr_revokes--;
78         }
79         GLOCK_BUG_ON(gl, !fsync && atomic_read(&gl->gl_ail_count));
80         spin_unlock(&sdp->sd_ail_lock);
81         gfs2_log_unlock(sdp);
82 }
83
84
85 static int gfs2_ail_empty_gl(struct gfs2_glock *gl)
86 {
87         struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
88         struct gfs2_trans tr;
89         int ret;
90
91         memset(&tr, 0, sizeof(tr));
92         INIT_LIST_HEAD(&tr.tr_buf);
93         INIT_LIST_HEAD(&tr.tr_databuf);
94         tr.tr_revokes = atomic_read(&gl->gl_ail_count);
95
96         if (!tr.tr_revokes) {
97                 bool have_revokes;
98                 bool log_in_flight;
99
100                 /*
101                  * We have nothing on the ail, but there could be revokes on
102                  * the sdp revoke queue, in which case, we still want to flush
103                  * the log and wait for it to finish.
104                  *
105                  * If the sdp revoke list is empty too, we might still have an
106                  * io outstanding for writing revokes, so we should wait for
107                  * it before returning.
108                  *
109                  * If none of these conditions are true, our revokes are all
110                  * flushed and we can return.
111                  */
112                 gfs2_log_lock(sdp);
113                 have_revokes = !list_empty(&sdp->sd_log_revokes);
114                 log_in_flight = atomic_read(&sdp->sd_log_in_flight);
115                 gfs2_log_unlock(sdp);
116                 if (have_revokes)
117                         goto flush;
118                 if (log_in_flight)
119                         log_flush_wait(sdp);
120                 return 0;
121         }
122
123         /* A shortened, inline version of gfs2_trans_begin()
124          * tr->alloced is not set since the transaction structure is
125          * on the stack */
126         tr.tr_reserved = 1 + gfs2_struct2blk(sdp, tr.tr_revokes);
127         tr.tr_ip = _RET_IP_;
128         ret = gfs2_log_reserve(sdp, tr.tr_reserved);
129         if (ret < 0)
130                 return ret;
131         WARN_ON_ONCE(current->journal_info);
132         current->journal_info = &tr;
133
134         __gfs2_ail_flush(gl, 0, tr.tr_revokes);
135
136         gfs2_trans_end(sdp);
137 flush:
138         gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_NORMAL |
139                        GFS2_LFC_AIL_EMPTY_GL);
140         return 0;
141 }
142
143 void gfs2_ail_flush(struct gfs2_glock *gl, bool fsync)
144 {
145         struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
146         unsigned int revokes = atomic_read(&gl->gl_ail_count);
147         unsigned int max_revokes = (sdp->sd_sb.sb_bsize - sizeof(struct gfs2_log_descriptor)) / sizeof(u64);
148         int ret;
149
150         if (!revokes)
151                 return;
152
153         while (revokes > max_revokes)
154                 max_revokes += (sdp->sd_sb.sb_bsize - sizeof(struct gfs2_meta_header)) / sizeof(u64);
155
156         ret = gfs2_trans_begin(sdp, 0, max_revokes);
157         if (ret)
158                 return;
159         __gfs2_ail_flush(gl, fsync, max_revokes);
160         gfs2_trans_end(sdp);
161         gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_NORMAL |
162                        GFS2_LFC_AIL_FLUSH);
163 }
164
165 /**
166  * rgrp_go_sync - sync out the metadata for this glock
167  * @gl: the glock
168  *
169  * Called when demoting or unlocking an EX glock.  We must flush
170  * to disk all dirty buffers/pages relating to this glock, and must not
171  * return to caller to demote/unlock the glock until I/O is complete.
172  */
173
174 static int rgrp_go_sync(struct gfs2_glock *gl)
175 {
176         struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
177         struct address_space *mapping = &sdp->sd_aspace;
178         struct gfs2_rgrpd *rgd = gfs2_glock2rgrp(gl);
179         int error;
180
181         if (!test_and_clear_bit(GLF_DIRTY, &gl->gl_flags))
182                 return 0;
183         GLOCK_BUG_ON(gl, gl->gl_state != LM_ST_EXCLUSIVE);
184
185         gfs2_log_flush(sdp, gl, GFS2_LOG_HEAD_FLUSH_NORMAL |
186                        GFS2_LFC_RGRP_GO_SYNC);
187         filemap_fdatawrite_range(mapping, gl->gl_vm.start, gl->gl_vm.end);
188         error = filemap_fdatawait_range(mapping, gl->gl_vm.start, gl->gl_vm.end);
189         WARN_ON_ONCE(error);
190         mapping_set_error(mapping, error);
191         if (!error)
192                 error = gfs2_ail_empty_gl(gl);
193
194         spin_lock(&gl->gl_lockref.lock);
195         rgd = gl->gl_object;
196         if (rgd)
197                 gfs2_free_clones(rgd);
198         spin_unlock(&gl->gl_lockref.lock);
199         return error;
200 }
201
202 /**
203  * rgrp_go_inval - invalidate the metadata for this glock
204  * @gl: the glock
205  * @flags:
206  *
207  * We never used LM_ST_DEFERRED with resource groups, so that we
208  * should always see the metadata flag set here.
209  *
210  */
211
212 static void rgrp_go_inval(struct gfs2_glock *gl, int flags)
213 {
214         struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
215         struct address_space *mapping = &sdp->sd_aspace;
216         struct gfs2_rgrpd *rgd = gfs2_glock2rgrp(gl);
217
218         if (rgd)
219                 gfs2_rgrp_brelse(rgd);
220
221         WARN_ON_ONCE(!(flags & DIO_METADATA));
222         truncate_inode_pages_range(mapping, gl->gl_vm.start, gl->gl_vm.end);
223
224         if (rgd)
225                 rgd->rd_flags &= ~GFS2_RDF_UPTODATE;
226 }
227
228 static struct gfs2_inode *gfs2_glock2inode(struct gfs2_glock *gl)
229 {
230         struct gfs2_inode *ip;
231
232         spin_lock(&gl->gl_lockref.lock);
233         ip = gl->gl_object;
234         if (ip)
235                 set_bit(GIF_GLOP_PENDING, &ip->i_flags);
236         spin_unlock(&gl->gl_lockref.lock);
237         return ip;
238 }
239
240 struct gfs2_rgrpd *gfs2_glock2rgrp(struct gfs2_glock *gl)
241 {
242         struct gfs2_rgrpd *rgd;
243
244         spin_lock(&gl->gl_lockref.lock);
245         rgd = gl->gl_object;
246         spin_unlock(&gl->gl_lockref.lock);
247
248         return rgd;
249 }
250
251 static void gfs2_clear_glop_pending(struct gfs2_inode *ip)
252 {
253         if (!ip)
254                 return;
255
256         clear_bit_unlock(GIF_GLOP_PENDING, &ip->i_flags);
257         wake_up_bit(&ip->i_flags, GIF_GLOP_PENDING);
258 }
259
260 /**
261  * inode_go_sync - Sync the dirty data and/or metadata for an inode glock
262  * @gl: the glock protecting the inode
263  *
264  */
265
266 static int inode_go_sync(struct gfs2_glock *gl)
267 {
268         struct gfs2_inode *ip = gfs2_glock2inode(gl);
269         int isreg = ip && S_ISREG(ip->i_inode.i_mode);
270         struct address_space *metamapping = gfs2_glock2aspace(gl);
271         int error = 0;
272
273         if (isreg) {
274                 if (test_and_clear_bit(GIF_SW_PAGED, &ip->i_flags))
275                         unmap_shared_mapping_range(ip->i_inode.i_mapping, 0, 0);
276                 inode_dio_wait(&ip->i_inode);
277         }
278         if (!test_and_clear_bit(GLF_DIRTY, &gl->gl_flags))
279                 goto out;
280
281         GLOCK_BUG_ON(gl, gl->gl_state != LM_ST_EXCLUSIVE);
282
283         gfs2_log_flush(gl->gl_name.ln_sbd, gl, GFS2_LOG_HEAD_FLUSH_NORMAL |
284                        GFS2_LFC_INODE_GO_SYNC);
285         filemap_fdatawrite(metamapping);
286         if (isreg) {
287                 struct address_space *mapping = ip->i_inode.i_mapping;
288                 filemap_fdatawrite(mapping);
289                 error = filemap_fdatawait(mapping);
290                 mapping_set_error(mapping, error);
291         }
292         error = filemap_fdatawait(metamapping);
293         mapping_set_error(metamapping, error);
294         gfs2_ail_empty_gl(gl);
295         /*
296          * Writeback of the data mapping may cause the dirty flag to be set
297          * so we have to clear it again here.
298          */
299         smp_mb__before_atomic();
300         clear_bit(GLF_DIRTY, &gl->gl_flags);
301
302 out:
303         gfs2_clear_glop_pending(ip);
304         return error;
305 }
306
307 /**
308  * inode_go_inval - prepare a inode glock to be released
309  * @gl: the glock
310  * @flags:
311  *
312  * Normally we invalidate everything, but if we are moving into
313  * LM_ST_DEFERRED from LM_ST_SHARED or LM_ST_EXCLUSIVE then we
314  * can keep hold of the metadata, since it won't have changed.
315  *
316  */
317
318 static void inode_go_inval(struct gfs2_glock *gl, int flags)
319 {
320         struct gfs2_inode *ip = gfs2_glock2inode(gl);
321
322         if (flags & DIO_METADATA) {
323                 struct address_space *mapping = gfs2_glock2aspace(gl);
324                 truncate_inode_pages(mapping, 0);
325                 if (ip) {
326                         set_bit(GIF_INVALID, &ip->i_flags);
327                         forget_all_cached_acls(&ip->i_inode);
328                         security_inode_invalidate_secctx(&ip->i_inode);
329                         gfs2_dir_hash_inval(ip);
330                 }
331         }
332
333         if (ip == GFS2_I(gl->gl_name.ln_sbd->sd_rindex)) {
334                 gfs2_log_flush(gl->gl_name.ln_sbd, NULL,
335                                GFS2_LOG_HEAD_FLUSH_NORMAL |
336                                GFS2_LFC_INODE_GO_INVAL);
337                 gl->gl_name.ln_sbd->sd_rindex_uptodate = 0;
338         }
339         if (ip && S_ISREG(ip->i_inode.i_mode))
340                 truncate_inode_pages(ip->i_inode.i_mapping, 0);
341
342         gfs2_clear_glop_pending(ip);
343 }
344
345 /**
346  * inode_go_demote_ok - Check to see if it's ok to unlock an inode glock
347  * @gl: the glock
348  *
349  * Returns: 1 if it's ok
350  */
351
352 static int inode_go_demote_ok(const struct gfs2_glock *gl)
353 {
354         struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
355
356         if (sdp->sd_jindex == gl->gl_object || sdp->sd_rindex == gl->gl_object)
357                 return 0;
358
359         return 1;
360 }
361
362 static int gfs2_dinode_in(struct gfs2_inode *ip, const void *buf)
363 {
364         const struct gfs2_dinode *str = buf;
365         struct timespec64 atime;
366         u16 height, depth;
367
368         if (unlikely(ip->i_no_addr != be64_to_cpu(str->di_num.no_addr)))
369                 goto corrupt;
370         ip->i_no_formal_ino = be64_to_cpu(str->di_num.no_formal_ino);
371         ip->i_inode.i_mode = be32_to_cpu(str->di_mode);
372         ip->i_inode.i_rdev = 0;
373         switch (ip->i_inode.i_mode & S_IFMT) {
374         case S_IFBLK:
375         case S_IFCHR:
376                 ip->i_inode.i_rdev = MKDEV(be32_to_cpu(str->di_major),
377                                            be32_to_cpu(str->di_minor));
378                 break;
379         }
380
381         i_uid_write(&ip->i_inode, be32_to_cpu(str->di_uid));
382         i_gid_write(&ip->i_inode, be32_to_cpu(str->di_gid));
383         set_nlink(&ip->i_inode, be32_to_cpu(str->di_nlink));
384         i_size_write(&ip->i_inode, be64_to_cpu(str->di_size));
385         gfs2_set_inode_blocks(&ip->i_inode, be64_to_cpu(str->di_blocks));
386         atime.tv_sec = be64_to_cpu(str->di_atime);
387         atime.tv_nsec = be32_to_cpu(str->di_atime_nsec);
388         if (timespec64_compare(&ip->i_inode.i_atime, &atime) < 0)
389                 ip->i_inode.i_atime = atime;
390         ip->i_inode.i_mtime.tv_sec = be64_to_cpu(str->di_mtime);
391         ip->i_inode.i_mtime.tv_nsec = be32_to_cpu(str->di_mtime_nsec);
392         ip->i_inode.i_ctime.tv_sec = be64_to_cpu(str->di_ctime);
393         ip->i_inode.i_ctime.tv_nsec = be32_to_cpu(str->di_ctime_nsec);
394
395         ip->i_goal = be64_to_cpu(str->di_goal_meta);
396         ip->i_generation = be64_to_cpu(str->di_generation);
397
398         ip->i_diskflags = be32_to_cpu(str->di_flags);
399         ip->i_eattr = be64_to_cpu(str->di_eattr);
400         /* i_diskflags and i_eattr must be set before gfs2_set_inode_flags() */
401         gfs2_set_inode_flags(&ip->i_inode);
402         height = be16_to_cpu(str->di_height);
403         if (unlikely(height > GFS2_MAX_META_HEIGHT))
404                 goto corrupt;
405         ip->i_height = (u8)height;
406
407         depth = be16_to_cpu(str->di_depth);
408         if (unlikely(depth > GFS2_DIR_MAX_DEPTH))
409                 goto corrupt;
410         ip->i_depth = (u8)depth;
411         ip->i_entries = be32_to_cpu(str->di_entries);
412
413         if (S_ISREG(ip->i_inode.i_mode))
414                 gfs2_set_aops(&ip->i_inode);
415
416         return 0;
417 corrupt:
418         gfs2_consist_inode(ip);
419         return -EIO;
420 }
421
422 /**
423  * gfs2_inode_refresh - Refresh the incore copy of the dinode
424  * @ip: The GFS2 inode
425  *
426  * Returns: errno
427  */
428
429 int gfs2_inode_refresh(struct gfs2_inode *ip)
430 {
431         struct buffer_head *dibh;
432         int error;
433
434         error = gfs2_meta_inode_buffer(ip, &dibh);
435         if (error)
436                 return error;
437
438         error = gfs2_dinode_in(ip, dibh->b_data);
439         brelse(dibh);
440         clear_bit(GIF_INVALID, &ip->i_flags);
441
442         return error;
443 }
444
445 /**
446  * inode_go_lock - operation done after an inode lock is locked by a process
447  * @gl: the glock
448  * @flags:
449  *
450  * Returns: errno
451  */
452
453 static int inode_go_lock(struct gfs2_holder *gh)
454 {
455         struct gfs2_glock *gl = gh->gh_gl;
456         struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
457         struct gfs2_inode *ip = gl->gl_object;
458         int error = 0;
459
460         if (!ip || (gh->gh_flags & GL_SKIP))
461                 return 0;
462
463         if (test_bit(GIF_INVALID, &ip->i_flags)) {
464                 error = gfs2_inode_refresh(ip);
465                 if (error)
466                         return error;
467         }
468
469         if (gh->gh_state != LM_ST_DEFERRED)
470                 inode_dio_wait(&ip->i_inode);
471
472         if ((ip->i_diskflags & GFS2_DIF_TRUNC_IN_PROG) &&
473             (gl->gl_state == LM_ST_EXCLUSIVE) &&
474             (gh->gh_state == LM_ST_EXCLUSIVE)) {
475                 spin_lock(&sdp->sd_trunc_lock);
476                 if (list_empty(&ip->i_trunc_list))
477                         list_add(&ip->i_trunc_list, &sdp->sd_trunc_list);
478                 spin_unlock(&sdp->sd_trunc_lock);
479                 wake_up(&sdp->sd_quota_wait);
480                 return 1;
481         }
482
483         return error;
484 }
485
486 /**
487  * inode_go_dump - print information about an inode
488  * @seq: The iterator
489  * @ip: the inode
490  * @fs_id_buf: file system id (may be empty)
491  *
492  */
493
494 static void inode_go_dump(struct seq_file *seq, struct gfs2_glock *gl,
495                           const char *fs_id_buf)
496 {
497         struct gfs2_inode *ip = gl->gl_object;
498         struct inode *inode = &ip->i_inode;
499         unsigned long nrpages;
500
501         if (ip == NULL)
502                 return;
503
504         xa_lock_irq(&inode->i_data.i_pages);
505         nrpages = inode->i_data.nrpages;
506         xa_unlock_irq(&inode->i_data.i_pages);
507
508         gfs2_print_dbg(seq, "%s I: n:%llu/%llu t:%u f:0x%02lx d:0x%08x s:%llu "
509                        "p:%lu\n", fs_id_buf,
510                   (unsigned long long)ip->i_no_formal_ino,
511                   (unsigned long long)ip->i_no_addr,
512                   IF2DT(ip->i_inode.i_mode), ip->i_flags,
513                   (unsigned int)ip->i_diskflags,
514                   (unsigned long long)i_size_read(inode), nrpages);
515 }
516
517 /**
518  * freeze_go_sync - promote/demote the freeze glock
519  * @gl: the glock
520  * @state: the requested state
521  * @flags:
522  *
523  */
524
525 static int freeze_go_sync(struct gfs2_glock *gl)
526 {
527         int error = 0;
528         struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
529
530         if (gl->gl_state == LM_ST_SHARED && !gfs2_withdrawn(sdp) &&
531             test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
532                 atomic_set(&sdp->sd_freeze_state, SFS_STARTING_FREEZE);
533                 error = freeze_super(sdp->sd_vfs);
534                 if (error) {
535                         fs_info(sdp, "GFS2: couldn't freeze filesystem: %d\n",
536                                 error);
537                         if (gfs2_withdrawn(sdp)) {
538                                 atomic_set(&sdp->sd_freeze_state, SFS_UNFROZEN);
539                                 return 0;
540                         }
541                         gfs2_assert_withdraw(sdp, 0);
542                 }
543                 queue_work(gfs2_freeze_wq, &sdp->sd_freeze_work);
544                 gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_FREEZE |
545                                GFS2_LFC_FREEZE_GO_SYNC);
546         }
547         return 0;
548 }
549
550 /**
551  * freeze_go_xmote_bh - After promoting/demoting the freeze glock
552  * @gl: the glock
553  *
554  */
555
556 static int freeze_go_xmote_bh(struct gfs2_glock *gl, struct gfs2_holder *gh)
557 {
558         struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
559         struct gfs2_inode *ip = GFS2_I(sdp->sd_jdesc->jd_inode);
560         struct gfs2_glock *j_gl = ip->i_gl;
561         struct gfs2_log_header_host head;
562         int error;
563
564         if (test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
565                 j_gl->gl_ops->go_inval(j_gl, DIO_METADATA);
566
567                 error = gfs2_find_jhead(sdp->sd_jdesc, &head, false);
568                 if (error)
569                         gfs2_consist(sdp);
570                 if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT))
571                         gfs2_consist(sdp);
572
573                 /*  Initialize some head of the log stuff  */
574                 if (!gfs2_withdrawn(sdp)) {
575                         sdp->sd_log_sequence = head.lh_sequence + 1;
576                         gfs2_log_pointers_init(sdp, head.lh_blkno);
577                 }
578         }
579         return 0;
580 }
581
582 /**
583  * trans_go_demote_ok
584  * @gl: the glock
585  *
586  * Always returns 0
587  */
588
589 static int freeze_go_demote_ok(const struct gfs2_glock *gl)
590 {
591         return 0;
592 }
593
594 /**
595  * iopen_go_callback - schedule the dcache entry for the inode to be deleted
596  * @gl: the glock
597  *
598  * gl_lockref.lock lock is held while calling this
599  */
600 static void iopen_go_callback(struct gfs2_glock *gl, bool remote)
601 {
602         struct gfs2_inode *ip = gl->gl_object;
603         struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
604
605         if (!remote || sb_rdonly(sdp->sd_vfs))
606                 return;
607
608         if (gl->gl_demote_state == LM_ST_UNLOCKED &&
609             gl->gl_state == LM_ST_SHARED && ip) {
610                 gl->gl_lockref.count++;
611                 if (queue_work(gfs2_delete_workqueue, &gl->gl_delete) == 0)
612                         gl->gl_lockref.count--;
613         }
614 }
615
616 /**
617  * inode_go_free - wake up anyone waiting for dlm's unlock ast to free it
618  * @gl: glock being freed
619  *
620  * For now, this is only used for the journal inode glock. In withdraw
621  * situations, we need to wait for the glock to be freed so that we know
622  * other nodes may proceed with recovery / journal replay.
623  */
624 static void inode_go_free(struct gfs2_glock *gl)
625 {
626         /* Note that we cannot reference gl_object because it's already set
627          * to NULL by this point in its lifecycle. */
628         if (!test_bit(GLF_FREEING, &gl->gl_flags))
629                 return;
630         clear_bit_unlock(GLF_FREEING, &gl->gl_flags);
631         wake_up_bit(&gl->gl_flags, GLF_FREEING);
632 }
633
634 /**
635  * nondisk_go_callback - used to signal when a node did a withdraw
636  * @gl: the nondisk glock
637  * @remote: true if this came from a different cluster node
638  *
639  */
640 static void nondisk_go_callback(struct gfs2_glock *gl, bool remote)
641 {
642         struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
643
644         /* Ignore the callback unless it's from another node, and it's the
645            live lock. */
646         if (!remote || gl->gl_name.ln_number != GFS2_LIVE_LOCK)
647                 return;
648
649         /* First order of business is to cancel the demote request. We don't
650          * really want to demote a nondisk glock. At best it's just to inform
651          * us of another node's withdraw. We'll keep it in SH mode. */
652         clear_bit(GLF_DEMOTE, &gl->gl_flags);
653         clear_bit(GLF_PENDING_DEMOTE, &gl->gl_flags);
654
655         /* Ignore the unlock if we're withdrawn, unmounting, or in recovery. */
656         if (test_bit(SDF_NORECOVERY, &sdp->sd_flags) ||
657             test_bit(SDF_WITHDRAWN, &sdp->sd_flags) ||
658             test_bit(SDF_REMOTE_WITHDRAW, &sdp->sd_flags))
659                 return;
660
661         /* We only care when a node wants us to unlock, because that means
662          * they want a journal recovered. */
663         if (gl->gl_demote_state != LM_ST_UNLOCKED)
664                 return;
665
666         if (sdp->sd_args.ar_spectator) {
667                 fs_warn(sdp, "Spectator node cannot recover journals.\n");
668                 return;
669         }
670
671         fs_warn(sdp, "Some node has withdrawn; checking for recovery.\n");
672         set_bit(SDF_REMOTE_WITHDRAW, &sdp->sd_flags);
673         /*
674          * We can't call remote_withdraw directly here or gfs2_recover_journal
675          * because this is called from the glock unlock function and the
676          * remote_withdraw needs to enqueue and dequeue the same "live" glock
677          * we were called from. So we queue it to the control work queue in
678          * lock_dlm.
679          */
680         queue_delayed_work(gfs2_control_wq, &sdp->sd_control_work, 0);
681 }
682
683 const struct gfs2_glock_operations gfs2_meta_glops = {
684         .go_type = LM_TYPE_META,
685         .go_flags = GLOF_NONDISK,
686 };
687
688 const struct gfs2_glock_operations gfs2_inode_glops = {
689         .go_sync = inode_go_sync,
690         .go_inval = inode_go_inval,
691         .go_demote_ok = inode_go_demote_ok,
692         .go_lock = inode_go_lock,
693         .go_dump = inode_go_dump,
694         .go_type = LM_TYPE_INODE,
695         .go_flags = GLOF_ASPACE | GLOF_LRU,
696         .go_free = inode_go_free,
697 };
698
699 const struct gfs2_glock_operations gfs2_rgrp_glops = {
700         .go_sync = rgrp_go_sync,
701         .go_inval = rgrp_go_inval,
702         .go_lock = gfs2_rgrp_go_lock,
703         .go_dump = gfs2_rgrp_dump,
704         .go_type = LM_TYPE_RGRP,
705         .go_flags = GLOF_LVB,
706 };
707
708 const struct gfs2_glock_operations gfs2_freeze_glops = {
709         .go_sync = freeze_go_sync,
710         .go_xmote_bh = freeze_go_xmote_bh,
711         .go_demote_ok = freeze_go_demote_ok,
712         .go_type = LM_TYPE_NONDISK,
713         .go_flags = GLOF_NONDISK,
714 };
715
716 const struct gfs2_glock_operations gfs2_iopen_glops = {
717         .go_type = LM_TYPE_IOPEN,
718         .go_callback = iopen_go_callback,
719         .go_flags = GLOF_LRU | GLOF_NONDISK,
720 };
721
722 const struct gfs2_glock_operations gfs2_flock_glops = {
723         .go_type = LM_TYPE_FLOCK,
724         .go_flags = GLOF_LRU | GLOF_NONDISK,
725 };
726
727 const struct gfs2_glock_operations gfs2_nondisk_glops = {
728         .go_type = LM_TYPE_NONDISK,
729         .go_flags = GLOF_NONDISK,
730         .go_callback = nondisk_go_callback,
731 };
732
733 const struct gfs2_glock_operations gfs2_quota_glops = {
734         .go_type = LM_TYPE_QUOTA,
735         .go_flags = GLOF_LVB | GLOF_LRU | GLOF_NONDISK,
736 };
737
738 const struct gfs2_glock_operations gfs2_journal_glops = {
739         .go_type = LM_TYPE_JOURNAL,
740         .go_flags = GLOF_NONDISK,
741 };
742
743 const struct gfs2_glock_operations *gfs2_glops_list[] = {
744         [LM_TYPE_META] = &gfs2_meta_glops,
745         [LM_TYPE_INODE] = &gfs2_inode_glops,
746         [LM_TYPE_RGRP] = &gfs2_rgrp_glops,
747         [LM_TYPE_IOPEN] = &gfs2_iopen_glops,
748         [LM_TYPE_FLOCK] = &gfs2_flock_glops,
749         [LM_TYPE_NONDISK] = &gfs2_nondisk_glops,
750         [LM_TYPE_QUOTA] = &gfs2_quota_glops,
751         [LM_TYPE_JOURNAL] = &gfs2_journal_glops,
752 };
753