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1/*
2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
3 * Copyright (C) 2004-2008 Red Hat, Inc. All rights reserved.
4 *
5 * This copyrighted material is made available to anyone wishing to use,
6 * modify, copy, or redistribute it subject to the terms and conditions
7 * of the GNU General Public License version 2.
8 */
9
10#include <linux/spinlock.h>
11#include <linux/completion.h>
12#include <linux/buffer_head.h>
13#include <linux/gfs2_ondisk.h>
14#include <linux/bio.h>
15#include <linux/posix_acl.h>
16
17#include "gfs2.h"
18#include "incore.h"
19#include "bmap.h"
20#include "glock.h"
21#include "glops.h"
22#include "inode.h"
23#include "log.h"
24#include "meta_io.h"
25#include "recovery.h"
26#include "rgrp.h"
27#include "util.h"
28#include "trans.h"
29#include "dir.h"
30
31static void gfs2_ail_error(struct gfs2_glock *gl, const struct buffer_head *bh)
32{
33 fs_err(gl->gl_sbd, "AIL buffer %p: blocknr %llu state 0x%08lx mapping %p page state 0x%lx\n",
34 bh, (unsigned long long)bh->b_blocknr, bh->b_state,
35 bh->b_page->mapping, bh->b_page->flags);
36 fs_err(gl->gl_sbd, "AIL glock %u:%llu mapping %p\n",
37 gl->gl_name.ln_type, gl->gl_name.ln_number,
38 gfs2_glock2aspace(gl));
39 gfs2_lm_withdraw(gl->gl_sbd, "AIL error\n");
40}
41
42/**
43 * __gfs2_ail_flush - remove all buffers for a given lock from the AIL
44 * @gl: the glock
45 * @fsync: set when called from fsync (not all buffers will be clean)
46 *
47 * None of the buffers should be dirty, locked, or pinned.
48 */
49
50static void __gfs2_ail_flush(struct gfs2_glock *gl, bool fsync,
51 unsigned int nr_revokes)
52{
53 struct gfs2_sbd *sdp = gl->gl_sbd;
54 struct list_head *head = &gl->gl_ail_list;
55 struct gfs2_bufdata *bd, *tmp;
56 struct buffer_head *bh;
57 const unsigned long b_state = (1UL << BH_Dirty)|(1UL << BH_Pinned)|(1UL << BH_Lock);
58
59 gfs2_log_lock(sdp);
60 spin_lock(&sdp->sd_ail_lock);
61 list_for_each_entry_safe_reverse(bd, tmp, head, bd_ail_gl_list) {
62 if (nr_revokes == 0)
63 break;
64 bh = bd->bd_bh;
65 if (bh->b_state & b_state) {
66 if (fsync)
67 continue;
68 gfs2_ail_error(gl, bh);
69 }
70 gfs2_trans_add_revoke(sdp, bd);
71 nr_revokes--;
72 }
73 GLOCK_BUG_ON(gl, !fsync && atomic_read(&gl->gl_ail_count));
74 spin_unlock(&sdp->sd_ail_lock);
75 gfs2_log_unlock(sdp);
76}
77
78
79static void gfs2_ail_empty_gl(struct gfs2_glock *gl)
80{
81 struct gfs2_sbd *sdp = gl->gl_sbd;
82 struct gfs2_trans tr;
83
84 memset(&tr, 0, sizeof(tr));
85 INIT_LIST_HEAD(&tr.tr_buf);
86 INIT_LIST_HEAD(&tr.tr_databuf);
87 tr.tr_revokes = atomic_read(&gl->gl_ail_count);
88
89 if (!tr.tr_revokes)
90 return;
91
92 /* A shortened, inline version of gfs2_trans_begin() */
93 tr.tr_reserved = 1 + gfs2_struct2blk(sdp, tr.tr_revokes, sizeof(u64));
94 tr.tr_ip = (unsigned long)__builtin_return_address(0);
95 sb_start_intwrite(sdp->sd_vfs);
96 gfs2_log_reserve(sdp, tr.tr_reserved);
97 WARN_ON_ONCE(current->journal_info);
98 current->journal_info = &tr;
99
100 __gfs2_ail_flush(gl, 0, tr.tr_revokes);
101
102 gfs2_trans_end(sdp);
103 gfs2_log_flush(sdp, NULL);
104}
105
106void gfs2_ail_flush(struct gfs2_glock *gl, bool fsync)
107{
108 struct gfs2_sbd *sdp = gl->gl_sbd;
109 unsigned int revokes = atomic_read(&gl->gl_ail_count);
110 unsigned int max_revokes = (sdp->sd_sb.sb_bsize - sizeof(struct gfs2_log_descriptor)) / sizeof(u64);
111 int ret;
112
113 if (!revokes)
114 return;
115
116 while (revokes > max_revokes)
117 max_revokes += (sdp->sd_sb.sb_bsize - sizeof(struct gfs2_meta_header)) / sizeof(u64);
118
119 ret = gfs2_trans_begin(sdp, 0, max_revokes);
120 if (ret)
121 return;
122 __gfs2_ail_flush(gl, fsync, max_revokes);
123 gfs2_trans_end(sdp);
124 gfs2_log_flush(sdp, NULL);
125}
126
127/**
128 * rgrp_go_sync - sync out the metadata for this glock
129 * @gl: the glock
130 *
131 * Called when demoting or unlocking an EX glock. We must flush
132 * to disk all dirty buffers/pages relating to this glock, and must not
133 * not return to caller to demote/unlock the glock until I/O is complete.
134 */
135
136static void rgrp_go_sync(struct gfs2_glock *gl)
137{
138 struct gfs2_sbd *sdp = gl->gl_sbd;
139 struct address_space *mapping = &sdp->sd_aspace;
140 struct gfs2_rgrpd *rgd;
141 int error;
142
143 if (!test_and_clear_bit(GLF_DIRTY, &gl->gl_flags))
144 return;
145 GLOCK_BUG_ON(gl, gl->gl_state != LM_ST_EXCLUSIVE);
146
147 gfs2_log_flush(sdp, gl);
148 filemap_fdatawrite_range(mapping, gl->gl_vm.start, gl->gl_vm.end);
149 error = filemap_fdatawait_range(mapping, gl->gl_vm.start, gl->gl_vm.end);
150 mapping_set_error(mapping, error);
151 gfs2_ail_empty_gl(gl);
152
153 spin_lock(&gl->gl_spin);
154 rgd = gl->gl_object;
155 if (rgd)
156 gfs2_free_clones(rgd);
157 spin_unlock(&gl->gl_spin);
158}
159
160/**
161 * rgrp_go_inval - invalidate the metadata for this glock
162 * @gl: the glock
163 * @flags:
164 *
165 * We never used LM_ST_DEFERRED with resource groups, so that we
166 * should always see the metadata flag set here.
167 *
168 */
169
170static void rgrp_go_inval(struct gfs2_glock *gl, int flags)
171{
172 struct gfs2_sbd *sdp = gl->gl_sbd;
173 struct address_space *mapping = &sdp->sd_aspace;
174
175 WARN_ON_ONCE(!(flags & DIO_METADATA));
176 gfs2_assert_withdraw(sdp, !atomic_read(&gl->gl_ail_count));
177 truncate_inode_pages_range(mapping, gl->gl_vm.start, gl->gl_vm.end);
178
179 if (gl->gl_object) {
180 struct gfs2_rgrpd *rgd = (struct gfs2_rgrpd *)gl->gl_object;
181 rgd->rd_flags &= ~GFS2_RDF_UPTODATE;
182 }
183}
184
185/**
186 * inode_go_sync - Sync the dirty data and/or metadata for an inode glock
187 * @gl: the glock protecting the inode
188 *
189 */
190
191static void inode_go_sync(struct gfs2_glock *gl)
192{
193 struct gfs2_inode *ip = gl->gl_object;
194 struct address_space *metamapping = gfs2_glock2aspace(gl);
195 int error;
196
197 if (ip && !S_ISREG(ip->i_inode.i_mode))
198 ip = NULL;
199 if (ip) {
200 if (test_and_clear_bit(GIF_SW_PAGED, &ip->i_flags))
201 unmap_shared_mapping_range(ip->i_inode.i_mapping, 0, 0);
202 inode_dio_wait(&ip->i_inode);
203 }
204 if (!test_and_clear_bit(GLF_DIRTY, &gl->gl_flags))
205 return;
206
207 GLOCK_BUG_ON(gl, gl->gl_state != LM_ST_EXCLUSIVE);
208
209 gfs2_log_flush(gl->gl_sbd, gl);
210 filemap_fdatawrite(metamapping);
211 if (ip) {
212 struct address_space *mapping = ip->i_inode.i_mapping;
213 filemap_fdatawrite(mapping);
214 error = filemap_fdatawait(mapping);
215 mapping_set_error(mapping, error);
216 }
217 error = filemap_fdatawait(metamapping);
218 mapping_set_error(metamapping, error);
219 gfs2_ail_empty_gl(gl);
220 /*
221 * Writeback of the data mapping may cause the dirty flag to be set
222 * so we have to clear it again here.
223 */
224 smp_mb__before_clear_bit();
225 clear_bit(GLF_DIRTY, &gl->gl_flags);
226}
227
228/**
229 * inode_go_inval - prepare a inode glock to be released
230 * @gl: the glock
231 * @flags:
232 *
233 * Normally we invlidate everything, but if we are moving into
234 * LM_ST_DEFERRED from LM_ST_SHARED or LM_ST_EXCLUSIVE then we
235 * can keep hold of the metadata, since it won't have changed.
236 *
237 */
238
239static void inode_go_inval(struct gfs2_glock *gl, int flags)
240{
241 struct gfs2_inode *ip = gl->gl_object;
242
243 gfs2_assert_withdraw(gl->gl_sbd, !atomic_read(&gl->gl_ail_count));
244
245 if (flags & DIO_METADATA) {
246 struct address_space *mapping = gfs2_glock2aspace(gl);
247 truncate_inode_pages(mapping, 0);
248 if (ip) {
249 set_bit(GIF_INVALID, &ip->i_flags);
250 forget_all_cached_acls(&ip->i_inode);
251 gfs2_dir_hash_inval(ip);
252 }
253 }
254
255 if (ip == GFS2_I(gl->gl_sbd->sd_rindex)) {
256 gfs2_log_flush(gl->gl_sbd, NULL);
257 gl->gl_sbd->sd_rindex_uptodate = 0;
258 }
259 if (ip && S_ISREG(ip->i_inode.i_mode))
260 truncate_inode_pages(ip->i_inode.i_mapping, 0);
261}
262
263/**
264 * inode_go_demote_ok - Check to see if it's ok to unlock an inode glock
265 * @gl: the glock
266 *
267 * Returns: 1 if it's ok
268 */
269
270static int inode_go_demote_ok(const struct gfs2_glock *gl)
271{
272 struct gfs2_sbd *sdp = gl->gl_sbd;
273 struct gfs2_holder *gh;
274
275 if (sdp->sd_jindex == gl->gl_object || sdp->sd_rindex == gl->gl_object)
276 return 0;
277
278 if (!list_empty(&gl->gl_holders)) {
279 gh = list_entry(gl->gl_holders.next, struct gfs2_holder, gh_list);
280 if (gh->gh_list.next != &gl->gl_holders)
281 return 0;
282 }
283
284 return 1;
285}
286
287/**
288 * gfs2_set_nlink - Set the inode's link count based on on-disk info
289 * @inode: The inode in question
290 * @nlink: The link count
291 *
292 * If the link count has hit zero, it must never be raised, whatever the
293 * on-disk inode might say. When new struct inodes are created the link
294 * count is set to 1, so that we can safely use this test even when reading
295 * in on disk information for the first time.
296 */
297
298static void gfs2_set_nlink(struct inode *inode, u32 nlink)
299{
300 /*
301 * We will need to review setting the nlink count here in the
302 * light of the forthcoming ro bind mount work. This is a reminder
303 * to do that.
304 */
305 if ((inode->i_nlink != nlink) && (inode->i_nlink != 0)) {
306 if (nlink == 0)
307 clear_nlink(inode);
308 else
309 set_nlink(inode, nlink);
310 }
311}
312
313static int gfs2_dinode_in(struct gfs2_inode *ip, const void *buf)
314{
315 const struct gfs2_dinode *str = buf;
316 struct timespec atime;
317 u16 height, depth;
318
319 if (unlikely(ip->i_no_addr != be64_to_cpu(str->di_num.no_addr)))
320 goto corrupt;
321 ip->i_no_formal_ino = be64_to_cpu(str->di_num.no_formal_ino);
322 ip->i_inode.i_mode = be32_to_cpu(str->di_mode);
323 ip->i_inode.i_rdev = 0;
324 switch (ip->i_inode.i_mode & S_IFMT) {
325 case S_IFBLK:
326 case S_IFCHR:
327 ip->i_inode.i_rdev = MKDEV(be32_to_cpu(str->di_major),
328 be32_to_cpu(str->di_minor));
329 break;
330 };
331
332 i_uid_write(&ip->i_inode, be32_to_cpu(str->di_uid));
333 i_gid_write(&ip->i_inode, be32_to_cpu(str->di_gid));
334 gfs2_set_nlink(&ip->i_inode, be32_to_cpu(str->di_nlink));
335 i_size_write(&ip->i_inode, be64_to_cpu(str->di_size));
336 gfs2_set_inode_blocks(&ip->i_inode, be64_to_cpu(str->di_blocks));
337 atime.tv_sec = be64_to_cpu(str->di_atime);
338 atime.tv_nsec = be32_to_cpu(str->di_atime_nsec);
339 if (timespec_compare(&ip->i_inode.i_atime, &atime) < 0)
340 ip->i_inode.i_atime = atime;
341 ip->i_inode.i_mtime.tv_sec = be64_to_cpu(str->di_mtime);
342 ip->i_inode.i_mtime.tv_nsec = be32_to_cpu(str->di_mtime_nsec);
343 ip->i_inode.i_ctime.tv_sec = be64_to_cpu(str->di_ctime);
344 ip->i_inode.i_ctime.tv_nsec = be32_to_cpu(str->di_ctime_nsec);
345
346 ip->i_goal = be64_to_cpu(str->di_goal_meta);
347 ip->i_generation = be64_to_cpu(str->di_generation);
348
349 ip->i_diskflags = be32_to_cpu(str->di_flags);
350 ip->i_eattr = be64_to_cpu(str->di_eattr);
351 /* i_diskflags and i_eattr must be set before gfs2_set_inode_flags() */
352 gfs2_set_inode_flags(&ip->i_inode);
353 height = be16_to_cpu(str->di_height);
354 if (unlikely(height > GFS2_MAX_META_HEIGHT))
355 goto corrupt;
356 ip->i_height = (u8)height;
357
358 depth = be16_to_cpu(str->di_depth);
359 if (unlikely(depth > GFS2_DIR_MAX_DEPTH))
360 goto corrupt;
361 ip->i_depth = (u8)depth;
362 ip->i_entries = be32_to_cpu(str->di_entries);
363
364 if (S_ISREG(ip->i_inode.i_mode))
365 gfs2_set_aops(&ip->i_inode);
366
367 return 0;
368corrupt:
369 gfs2_consist_inode(ip);
370 return -EIO;
371}
372
373/**
374 * gfs2_inode_refresh - Refresh the incore copy of the dinode
375 * @ip: The GFS2 inode
376 *
377 * Returns: errno
378 */
379
380int gfs2_inode_refresh(struct gfs2_inode *ip)
381{
382 struct buffer_head *dibh;
383 int error;
384
385 error = gfs2_meta_inode_buffer(ip, &dibh);
386 if (error)
387 return error;
388
389 error = gfs2_dinode_in(ip, dibh->b_data);
390 brelse(dibh);
391 clear_bit(GIF_INVALID, &ip->i_flags);
392
393 return error;
394}
395
396/**
397 * inode_go_lock - operation done after an inode lock is locked by a process
398 * @gl: the glock
399 * @flags:
400 *
401 * Returns: errno
402 */
403
404static int inode_go_lock(struct gfs2_holder *gh)
405{
406 struct gfs2_glock *gl = gh->gh_gl;
407 struct gfs2_sbd *sdp = gl->gl_sbd;
408 struct gfs2_inode *ip = gl->gl_object;
409 int error = 0;
410
411 if (!ip || (gh->gh_flags & GL_SKIP))
412 return 0;
413
414 if (test_bit(GIF_INVALID, &ip->i_flags)) {
415 error = gfs2_inode_refresh(ip);
416 if (error)
417 return error;
418 }
419
420 if (gh->gh_state != LM_ST_DEFERRED)
421 inode_dio_wait(&ip->i_inode);
422
423 if ((ip->i_diskflags & GFS2_DIF_TRUNC_IN_PROG) &&
424 (gl->gl_state == LM_ST_EXCLUSIVE) &&
425 (gh->gh_state == LM_ST_EXCLUSIVE)) {
426 spin_lock(&sdp->sd_trunc_lock);
427 if (list_empty(&ip->i_trunc_list))
428 list_add(&sdp->sd_trunc_list, &ip->i_trunc_list);
429 spin_unlock(&sdp->sd_trunc_lock);
430 wake_up(&sdp->sd_quota_wait);
431 return 1;
432 }
433
434 return error;
435}
436
437/**
438 * inode_go_dump - print information about an inode
439 * @seq: The iterator
440 * @ip: the inode
441 *
442 */
443
444static void inode_go_dump(struct seq_file *seq, const struct gfs2_glock *gl)
445{
446 const struct gfs2_inode *ip = gl->gl_object;
447 if (ip == NULL)
448 return;
449 gfs2_print_dbg(seq, " I: n:%llu/%llu t:%u f:0x%02lx d:0x%08x s:%llu\n",
450 (unsigned long long)ip->i_no_formal_ino,
451 (unsigned long long)ip->i_no_addr,
452 IF2DT(ip->i_inode.i_mode), ip->i_flags,
453 (unsigned int)ip->i_diskflags,
454 (unsigned long long)i_size_read(&ip->i_inode));
455}
456
457/**
458 * trans_go_sync - promote/demote the transaction glock
459 * @gl: the glock
460 * @state: the requested state
461 * @flags:
462 *
463 */
464
465static void trans_go_sync(struct gfs2_glock *gl)
466{
467 struct gfs2_sbd *sdp = gl->gl_sbd;
468
469 if (gl->gl_state != LM_ST_UNLOCKED &&
470 test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
471 gfs2_meta_syncfs(sdp);
472 gfs2_log_shutdown(sdp);
473 }
474}
475
476/**
477 * trans_go_xmote_bh - After promoting/demoting the transaction glock
478 * @gl: the glock
479 *
480 */
481
482static int trans_go_xmote_bh(struct gfs2_glock *gl, struct gfs2_holder *gh)
483{
484 struct gfs2_sbd *sdp = gl->gl_sbd;
485 struct gfs2_inode *ip = GFS2_I(sdp->sd_jdesc->jd_inode);
486 struct gfs2_glock *j_gl = ip->i_gl;
487 struct gfs2_log_header_host head;
488 int error;
489
490 if (test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
491 j_gl->gl_ops->go_inval(j_gl, DIO_METADATA);
492
493 error = gfs2_find_jhead(sdp->sd_jdesc, &head);
494 if (error)
495 gfs2_consist(sdp);
496 if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT))
497 gfs2_consist(sdp);
498
499 /* Initialize some head of the log stuff */
500 if (!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) {
501 sdp->sd_log_sequence = head.lh_sequence + 1;
502 gfs2_log_pointers_init(sdp, head.lh_blkno);
503 }
504 }
505 return 0;
506}
507
508/**
509 * trans_go_demote_ok
510 * @gl: the glock
511 *
512 * Always returns 0
513 */
514
515static int trans_go_demote_ok(const struct gfs2_glock *gl)
516{
517 return 0;
518}
519
520/**
521 * iopen_go_callback - schedule the dcache entry for the inode to be deleted
522 * @gl: the glock
523 *
524 * gl_spin lock is held while calling this
525 */
526static void iopen_go_callback(struct gfs2_glock *gl, bool remote)
527{
528 struct gfs2_inode *ip = (struct gfs2_inode *)gl->gl_object;
529 struct gfs2_sbd *sdp = gl->gl_sbd;
530
531 if (!remote || (sdp->sd_vfs->s_flags & MS_RDONLY))
532 return;
533
534 if (gl->gl_demote_state == LM_ST_UNLOCKED &&
535 gl->gl_state == LM_ST_SHARED && ip) {
536 gl->gl_lockref.count++;
537 if (queue_work(gfs2_delete_workqueue, &gl->gl_delete) == 0)
538 gl->gl_lockref.count--;
539 }
540}
541
542const struct gfs2_glock_operations gfs2_meta_glops = {
543 .go_type = LM_TYPE_META,
544};
545
546const struct gfs2_glock_operations gfs2_inode_glops = {
547 .go_sync = inode_go_sync,
548 .go_inval = inode_go_inval,
549 .go_demote_ok = inode_go_demote_ok,
550 .go_lock = inode_go_lock,
551 .go_dump = inode_go_dump,
552 .go_type = LM_TYPE_INODE,
553 .go_flags = GLOF_ASPACE,
554};
555
556const struct gfs2_glock_operations gfs2_rgrp_glops = {
557 .go_sync = rgrp_go_sync,
558 .go_inval = rgrp_go_inval,
559 .go_lock = gfs2_rgrp_go_lock,
560 .go_unlock = gfs2_rgrp_go_unlock,
561 .go_dump = gfs2_rgrp_dump,
562 .go_type = LM_TYPE_RGRP,
563 .go_flags = GLOF_LVB,
564};
565
566const struct gfs2_glock_operations gfs2_trans_glops = {
567 .go_sync = trans_go_sync,
568 .go_xmote_bh = trans_go_xmote_bh,
569 .go_demote_ok = trans_go_demote_ok,
570 .go_type = LM_TYPE_NONDISK,
571};
572
573const struct gfs2_glock_operations gfs2_iopen_glops = {
574 .go_type = LM_TYPE_IOPEN,
575 .go_callback = iopen_go_callback,
576};
577
578const struct gfs2_glock_operations gfs2_flock_glops = {
579 .go_type = LM_TYPE_FLOCK,
580};
581
582const struct gfs2_glock_operations gfs2_nondisk_glops = {
583 .go_type = LM_TYPE_NONDISK,
584};
585
586const struct gfs2_glock_operations gfs2_quota_glops = {
587 .go_type = LM_TYPE_QUOTA,
588 .go_flags = GLOF_LVB,
589};
590
591const struct gfs2_glock_operations gfs2_journal_glops = {
592 .go_type = LM_TYPE_JOURNAL,
593};
594
595const struct gfs2_glock_operations *gfs2_glops_list[] = {
596 [LM_TYPE_META] = &gfs2_meta_glops,
597 [LM_TYPE_INODE] = &gfs2_inode_glops,
598 [LM_TYPE_RGRP] = &gfs2_rgrp_glops,
599 [LM_TYPE_IOPEN] = &gfs2_iopen_glops,
600 [LM_TYPE_FLOCK] = &gfs2_flock_glops,
601 [LM_TYPE_NONDISK] = &gfs2_nondisk_glops,
602 [LM_TYPE_QUOTA] = &gfs2_quota_glops,
603 [LM_TYPE_JOURNAL] = &gfs2_journal_glops,
604};
605
1/*
2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
3 * Copyright (C) 2004-2008 Red Hat, Inc. All rights reserved.
4 *
5 * This copyrighted material is made available to anyone wishing to use,
6 * modify, copy, or redistribute it subject to the terms and conditions
7 * of the GNU General Public License version 2.
8 */
9
10#include <linux/spinlock.h>
11#include <linux/completion.h>
12#include <linux/buffer_head.h>
13#include <linux/gfs2_ondisk.h>
14#include <linux/bio.h>
15#include <linux/posix_acl.h>
16
17#include "gfs2.h"
18#include "incore.h"
19#include "bmap.h"
20#include "glock.h"
21#include "glops.h"
22#include "inode.h"
23#include "log.h"
24#include "meta_io.h"
25#include "recovery.h"
26#include "rgrp.h"
27#include "util.h"
28#include "trans.h"
29#include "dir.h"
30
31static void gfs2_ail_error(struct gfs2_glock *gl, const struct buffer_head *bh)
32{
33 fs_err(gl->gl_sbd, "AIL buffer %p: blocknr %llu state 0x%08lx mapping %p page state 0x%lx\n",
34 bh, (unsigned long long)bh->b_blocknr, bh->b_state,
35 bh->b_page->mapping, bh->b_page->flags);
36 fs_err(gl->gl_sbd, "AIL glock %u:%llu mapping %p\n",
37 gl->gl_name.ln_type, gl->gl_name.ln_number,
38 gfs2_glock2aspace(gl));
39 gfs2_lm_withdraw(gl->gl_sbd, "AIL error\n");
40}
41
42/**
43 * __gfs2_ail_flush - remove all buffers for a given lock from the AIL
44 * @gl: the glock
45 * @fsync: set when called from fsync (not all buffers will be clean)
46 *
47 * None of the buffers should be dirty, locked, or pinned.
48 */
49
50static void __gfs2_ail_flush(struct gfs2_glock *gl, bool fsync)
51{
52 struct gfs2_sbd *sdp = gl->gl_sbd;
53 struct list_head *head = &gl->gl_ail_list;
54 struct gfs2_bufdata *bd, *tmp;
55 struct buffer_head *bh;
56 const unsigned long b_state = (1UL << BH_Dirty)|(1UL << BH_Pinned)|(1UL << BH_Lock);
57 sector_t blocknr;
58
59 gfs2_log_lock(sdp);
60 spin_lock(&sdp->sd_ail_lock);
61 list_for_each_entry_safe(bd, tmp, head, bd_ail_gl_list) {
62 bh = bd->bd_bh;
63 if (bh->b_state & b_state) {
64 if (fsync)
65 continue;
66 gfs2_ail_error(gl, bh);
67 }
68 blocknr = bh->b_blocknr;
69 bh->b_private = NULL;
70 gfs2_remove_from_ail(bd); /* drops ref on bh */
71
72 bd->bd_bh = NULL;
73 bd->bd_blkno = blocknr;
74
75 gfs2_trans_add_revoke(sdp, bd);
76 }
77 BUG_ON(!fsync && atomic_read(&gl->gl_ail_count));
78 spin_unlock(&sdp->sd_ail_lock);
79 gfs2_log_unlock(sdp);
80}
81
82
83static void gfs2_ail_empty_gl(struct gfs2_glock *gl)
84{
85 struct gfs2_sbd *sdp = gl->gl_sbd;
86 struct gfs2_trans tr;
87
88 memset(&tr, 0, sizeof(tr));
89 tr.tr_revokes = atomic_read(&gl->gl_ail_count);
90
91 if (!tr.tr_revokes)
92 return;
93
94 /* A shortened, inline version of gfs2_trans_begin() */
95 tr.tr_reserved = 1 + gfs2_struct2blk(sdp, tr.tr_revokes, sizeof(u64));
96 tr.tr_ip = (unsigned long)__builtin_return_address(0);
97 gfs2_log_reserve(sdp, tr.tr_reserved);
98 BUG_ON(current->journal_info);
99 current->journal_info = &tr;
100
101 __gfs2_ail_flush(gl, 0);
102
103 gfs2_trans_end(sdp);
104 gfs2_log_flush(sdp, NULL);
105}
106
107void gfs2_ail_flush(struct gfs2_glock *gl, bool fsync)
108{
109 struct gfs2_sbd *sdp = gl->gl_sbd;
110 unsigned int revokes = atomic_read(&gl->gl_ail_count);
111 int ret;
112
113 if (!revokes)
114 return;
115
116 ret = gfs2_trans_begin(sdp, 0, revokes);
117 if (ret)
118 return;
119 __gfs2_ail_flush(gl, fsync);
120 gfs2_trans_end(sdp);
121 gfs2_log_flush(sdp, NULL);
122}
123
124/**
125 * rgrp_go_sync - sync out the metadata for this glock
126 * @gl: the glock
127 *
128 * Called when demoting or unlocking an EX glock. We must flush
129 * to disk all dirty buffers/pages relating to this glock, and must not
130 * not return to caller to demote/unlock the glock until I/O is complete.
131 */
132
133static void rgrp_go_sync(struct gfs2_glock *gl)
134{
135 struct address_space *metamapping = gfs2_glock2aspace(gl);
136 struct gfs2_rgrpd *rgd;
137 int error;
138
139 if (!test_and_clear_bit(GLF_DIRTY, &gl->gl_flags))
140 return;
141 BUG_ON(gl->gl_state != LM_ST_EXCLUSIVE);
142
143 gfs2_log_flush(gl->gl_sbd, gl);
144 filemap_fdatawrite(metamapping);
145 error = filemap_fdatawait(metamapping);
146 mapping_set_error(metamapping, error);
147 gfs2_ail_empty_gl(gl);
148
149 spin_lock(&gl->gl_spin);
150 rgd = gl->gl_object;
151 if (rgd)
152 gfs2_free_clones(rgd);
153 spin_unlock(&gl->gl_spin);
154}
155
156/**
157 * rgrp_go_inval - invalidate the metadata for this glock
158 * @gl: the glock
159 * @flags:
160 *
161 * We never used LM_ST_DEFERRED with resource groups, so that we
162 * should always see the metadata flag set here.
163 *
164 */
165
166static void rgrp_go_inval(struct gfs2_glock *gl, int flags)
167{
168 struct address_space *mapping = gfs2_glock2aspace(gl);
169
170 BUG_ON(!(flags & DIO_METADATA));
171 gfs2_assert_withdraw(gl->gl_sbd, !atomic_read(&gl->gl_ail_count));
172 truncate_inode_pages(mapping, 0);
173
174 if (gl->gl_object) {
175 struct gfs2_rgrpd *rgd = (struct gfs2_rgrpd *)gl->gl_object;
176 rgd->rd_flags &= ~GFS2_RDF_UPTODATE;
177 }
178}
179
180/**
181 * inode_go_sync - Sync the dirty data and/or metadata for an inode glock
182 * @gl: the glock protecting the inode
183 *
184 */
185
186static void inode_go_sync(struct gfs2_glock *gl)
187{
188 struct gfs2_inode *ip = gl->gl_object;
189 struct address_space *metamapping = gfs2_glock2aspace(gl);
190 int error;
191
192 if (ip && !S_ISREG(ip->i_inode.i_mode))
193 ip = NULL;
194 if (ip && test_and_clear_bit(GIF_SW_PAGED, &ip->i_flags))
195 unmap_shared_mapping_range(ip->i_inode.i_mapping, 0, 0);
196 if (!test_and_clear_bit(GLF_DIRTY, &gl->gl_flags))
197 return;
198
199 BUG_ON(gl->gl_state != LM_ST_EXCLUSIVE);
200
201 gfs2_log_flush(gl->gl_sbd, gl);
202 filemap_fdatawrite(metamapping);
203 if (ip) {
204 struct address_space *mapping = ip->i_inode.i_mapping;
205 filemap_fdatawrite(mapping);
206 error = filemap_fdatawait(mapping);
207 mapping_set_error(mapping, error);
208 }
209 error = filemap_fdatawait(metamapping);
210 mapping_set_error(metamapping, error);
211 gfs2_ail_empty_gl(gl);
212 /*
213 * Writeback of the data mapping may cause the dirty flag to be set
214 * so we have to clear it again here.
215 */
216 smp_mb__before_clear_bit();
217 clear_bit(GLF_DIRTY, &gl->gl_flags);
218}
219
220/**
221 * inode_go_inval - prepare a inode glock to be released
222 * @gl: the glock
223 * @flags:
224 *
225 * Normally we invlidate everything, but if we are moving into
226 * LM_ST_DEFERRED from LM_ST_SHARED or LM_ST_EXCLUSIVE then we
227 * can keep hold of the metadata, since it won't have changed.
228 *
229 */
230
231static void inode_go_inval(struct gfs2_glock *gl, int flags)
232{
233 struct gfs2_inode *ip = gl->gl_object;
234
235 gfs2_assert_withdraw(gl->gl_sbd, !atomic_read(&gl->gl_ail_count));
236
237 if (flags & DIO_METADATA) {
238 struct address_space *mapping = gfs2_glock2aspace(gl);
239 truncate_inode_pages(mapping, 0);
240 if (ip) {
241 set_bit(GIF_INVALID, &ip->i_flags);
242 forget_all_cached_acls(&ip->i_inode);
243 gfs2_dir_hash_inval(ip);
244 }
245 }
246
247 if (ip == GFS2_I(gl->gl_sbd->sd_rindex)) {
248 gfs2_log_flush(gl->gl_sbd, NULL);
249 gl->gl_sbd->sd_rindex_uptodate = 0;
250 }
251 if (ip && S_ISREG(ip->i_inode.i_mode))
252 truncate_inode_pages(ip->i_inode.i_mapping, 0);
253}
254
255/**
256 * inode_go_demote_ok - Check to see if it's ok to unlock an inode glock
257 * @gl: the glock
258 *
259 * Returns: 1 if it's ok
260 */
261
262static int inode_go_demote_ok(const struct gfs2_glock *gl)
263{
264 struct gfs2_sbd *sdp = gl->gl_sbd;
265 struct gfs2_holder *gh;
266
267 if (sdp->sd_jindex == gl->gl_object || sdp->sd_rindex == gl->gl_object)
268 return 0;
269
270 if (!list_empty(&gl->gl_holders)) {
271 gh = list_entry(gl->gl_holders.next, struct gfs2_holder, gh_list);
272 if (gh->gh_list.next != &gl->gl_holders)
273 return 0;
274 }
275
276 return 1;
277}
278
279/**
280 * gfs2_set_nlink - Set the inode's link count based on on-disk info
281 * @inode: The inode in question
282 * @nlink: The link count
283 *
284 * If the link count has hit zero, it must never be raised, whatever the
285 * on-disk inode might say. When new struct inodes are created the link
286 * count is set to 1, so that we can safely use this test even when reading
287 * in on disk information for the first time.
288 */
289
290static void gfs2_set_nlink(struct inode *inode, u32 nlink)
291{
292 /*
293 * We will need to review setting the nlink count here in the
294 * light of the forthcoming ro bind mount work. This is a reminder
295 * to do that.
296 */
297 if ((inode->i_nlink != nlink) && (inode->i_nlink != 0)) {
298 if (nlink == 0)
299 clear_nlink(inode);
300 else
301 set_nlink(inode, nlink);
302 }
303}
304
305static int gfs2_dinode_in(struct gfs2_inode *ip, const void *buf)
306{
307 const struct gfs2_dinode *str = buf;
308 struct timespec atime;
309 u16 height, depth;
310
311 if (unlikely(ip->i_no_addr != be64_to_cpu(str->di_num.no_addr)))
312 goto corrupt;
313 ip->i_no_formal_ino = be64_to_cpu(str->di_num.no_formal_ino);
314 ip->i_inode.i_mode = be32_to_cpu(str->di_mode);
315 ip->i_inode.i_rdev = 0;
316 switch (ip->i_inode.i_mode & S_IFMT) {
317 case S_IFBLK:
318 case S_IFCHR:
319 ip->i_inode.i_rdev = MKDEV(be32_to_cpu(str->di_major),
320 be32_to_cpu(str->di_minor));
321 break;
322 };
323
324 ip->i_inode.i_uid = be32_to_cpu(str->di_uid);
325 ip->i_inode.i_gid = be32_to_cpu(str->di_gid);
326 gfs2_set_nlink(&ip->i_inode, be32_to_cpu(str->di_nlink));
327 i_size_write(&ip->i_inode, be64_to_cpu(str->di_size));
328 gfs2_set_inode_blocks(&ip->i_inode, be64_to_cpu(str->di_blocks));
329 atime.tv_sec = be64_to_cpu(str->di_atime);
330 atime.tv_nsec = be32_to_cpu(str->di_atime_nsec);
331 if (timespec_compare(&ip->i_inode.i_atime, &atime) < 0)
332 ip->i_inode.i_atime = atime;
333 ip->i_inode.i_mtime.tv_sec = be64_to_cpu(str->di_mtime);
334 ip->i_inode.i_mtime.tv_nsec = be32_to_cpu(str->di_mtime_nsec);
335 ip->i_inode.i_ctime.tv_sec = be64_to_cpu(str->di_ctime);
336 ip->i_inode.i_ctime.tv_nsec = be32_to_cpu(str->di_ctime_nsec);
337
338 ip->i_goal = be64_to_cpu(str->di_goal_meta);
339 ip->i_generation = be64_to_cpu(str->di_generation);
340
341 ip->i_diskflags = be32_to_cpu(str->di_flags);
342 ip->i_eattr = be64_to_cpu(str->di_eattr);
343 /* i_diskflags and i_eattr must be set before gfs2_set_inode_flags() */
344 gfs2_set_inode_flags(&ip->i_inode);
345 height = be16_to_cpu(str->di_height);
346 if (unlikely(height > GFS2_MAX_META_HEIGHT))
347 goto corrupt;
348 ip->i_height = (u8)height;
349
350 depth = be16_to_cpu(str->di_depth);
351 if (unlikely(depth > GFS2_DIR_MAX_DEPTH))
352 goto corrupt;
353 ip->i_depth = (u8)depth;
354 ip->i_entries = be32_to_cpu(str->di_entries);
355
356 if (S_ISREG(ip->i_inode.i_mode))
357 gfs2_set_aops(&ip->i_inode);
358
359 return 0;
360corrupt:
361 gfs2_consist_inode(ip);
362 return -EIO;
363}
364
365/**
366 * gfs2_inode_refresh - Refresh the incore copy of the dinode
367 * @ip: The GFS2 inode
368 *
369 * Returns: errno
370 */
371
372int gfs2_inode_refresh(struct gfs2_inode *ip)
373{
374 struct buffer_head *dibh;
375 int error;
376
377 error = gfs2_meta_inode_buffer(ip, &dibh);
378 if (error)
379 return error;
380
381 error = gfs2_dinode_in(ip, dibh->b_data);
382 brelse(dibh);
383 clear_bit(GIF_INVALID, &ip->i_flags);
384
385 return error;
386}
387
388/**
389 * inode_go_lock - operation done after an inode lock is locked by a process
390 * @gl: the glock
391 * @flags:
392 *
393 * Returns: errno
394 */
395
396static int inode_go_lock(struct gfs2_holder *gh)
397{
398 struct gfs2_glock *gl = gh->gh_gl;
399 struct gfs2_sbd *sdp = gl->gl_sbd;
400 struct gfs2_inode *ip = gl->gl_object;
401 int error = 0;
402
403 if (!ip || (gh->gh_flags & GL_SKIP))
404 return 0;
405
406 if (test_bit(GIF_INVALID, &ip->i_flags)) {
407 error = gfs2_inode_refresh(ip);
408 if (error)
409 return error;
410 }
411
412 if ((ip->i_diskflags & GFS2_DIF_TRUNC_IN_PROG) &&
413 (gl->gl_state == LM_ST_EXCLUSIVE) &&
414 (gh->gh_state == LM_ST_EXCLUSIVE)) {
415 spin_lock(&sdp->sd_trunc_lock);
416 if (list_empty(&ip->i_trunc_list))
417 list_add(&sdp->sd_trunc_list, &ip->i_trunc_list);
418 spin_unlock(&sdp->sd_trunc_lock);
419 wake_up(&sdp->sd_quota_wait);
420 return 1;
421 }
422
423 return error;
424}
425
426/**
427 * inode_go_dump - print information about an inode
428 * @seq: The iterator
429 * @ip: the inode
430 *
431 * Returns: 0 on success, -ENOBUFS when we run out of space
432 */
433
434static int inode_go_dump(struct seq_file *seq, const struct gfs2_glock *gl)
435{
436 const struct gfs2_inode *ip = gl->gl_object;
437 if (ip == NULL)
438 return 0;
439 gfs2_print_dbg(seq, " I: n:%llu/%llu t:%u f:0x%02lx d:0x%08x s:%llu\n",
440 (unsigned long long)ip->i_no_formal_ino,
441 (unsigned long long)ip->i_no_addr,
442 IF2DT(ip->i_inode.i_mode), ip->i_flags,
443 (unsigned int)ip->i_diskflags,
444 (unsigned long long)i_size_read(&ip->i_inode));
445 return 0;
446}
447
448/**
449 * trans_go_sync - promote/demote the transaction glock
450 * @gl: the glock
451 * @state: the requested state
452 * @flags:
453 *
454 */
455
456static void trans_go_sync(struct gfs2_glock *gl)
457{
458 struct gfs2_sbd *sdp = gl->gl_sbd;
459
460 if (gl->gl_state != LM_ST_UNLOCKED &&
461 test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
462 gfs2_meta_syncfs(sdp);
463 gfs2_log_shutdown(sdp);
464 }
465}
466
467/**
468 * trans_go_xmote_bh - After promoting/demoting the transaction glock
469 * @gl: the glock
470 *
471 */
472
473static int trans_go_xmote_bh(struct gfs2_glock *gl, struct gfs2_holder *gh)
474{
475 struct gfs2_sbd *sdp = gl->gl_sbd;
476 struct gfs2_inode *ip = GFS2_I(sdp->sd_jdesc->jd_inode);
477 struct gfs2_glock *j_gl = ip->i_gl;
478 struct gfs2_log_header_host head;
479 int error;
480
481 if (test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
482 j_gl->gl_ops->go_inval(j_gl, DIO_METADATA);
483
484 error = gfs2_find_jhead(sdp->sd_jdesc, &head);
485 if (error)
486 gfs2_consist(sdp);
487 if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT))
488 gfs2_consist(sdp);
489
490 /* Initialize some head of the log stuff */
491 if (!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) {
492 sdp->sd_log_sequence = head.lh_sequence + 1;
493 gfs2_log_pointers_init(sdp, head.lh_blkno);
494 }
495 }
496 return 0;
497}
498
499/**
500 * trans_go_demote_ok
501 * @gl: the glock
502 *
503 * Always returns 0
504 */
505
506static int trans_go_demote_ok(const struct gfs2_glock *gl)
507{
508 return 0;
509}
510
511/**
512 * iopen_go_callback - schedule the dcache entry for the inode to be deleted
513 * @gl: the glock
514 *
515 * gl_spin lock is held while calling this
516 */
517static void iopen_go_callback(struct gfs2_glock *gl)
518{
519 struct gfs2_inode *ip = (struct gfs2_inode *)gl->gl_object;
520 struct gfs2_sbd *sdp = gl->gl_sbd;
521
522 if (sdp->sd_vfs->s_flags & MS_RDONLY)
523 return;
524
525 if (gl->gl_demote_state == LM_ST_UNLOCKED &&
526 gl->gl_state == LM_ST_SHARED && ip) {
527 gfs2_glock_hold(gl);
528 if (queue_work(gfs2_delete_workqueue, &gl->gl_delete) == 0)
529 gfs2_glock_put_nolock(gl);
530 }
531}
532
533const struct gfs2_glock_operations gfs2_meta_glops = {
534 .go_type = LM_TYPE_META,
535};
536
537const struct gfs2_glock_operations gfs2_inode_glops = {
538 .go_xmote_th = inode_go_sync,
539 .go_inval = inode_go_inval,
540 .go_demote_ok = inode_go_demote_ok,
541 .go_lock = inode_go_lock,
542 .go_dump = inode_go_dump,
543 .go_type = LM_TYPE_INODE,
544 .go_flags = GLOF_ASPACE,
545};
546
547const struct gfs2_glock_operations gfs2_rgrp_glops = {
548 .go_xmote_th = rgrp_go_sync,
549 .go_inval = rgrp_go_inval,
550 .go_lock = gfs2_rgrp_go_lock,
551 .go_unlock = gfs2_rgrp_go_unlock,
552 .go_dump = gfs2_rgrp_dump,
553 .go_type = LM_TYPE_RGRP,
554 .go_flags = GLOF_ASPACE,
555};
556
557const struct gfs2_glock_operations gfs2_trans_glops = {
558 .go_xmote_th = trans_go_sync,
559 .go_xmote_bh = trans_go_xmote_bh,
560 .go_demote_ok = trans_go_demote_ok,
561 .go_type = LM_TYPE_NONDISK,
562};
563
564const struct gfs2_glock_operations gfs2_iopen_glops = {
565 .go_type = LM_TYPE_IOPEN,
566 .go_callback = iopen_go_callback,
567};
568
569const struct gfs2_glock_operations gfs2_flock_glops = {
570 .go_type = LM_TYPE_FLOCK,
571};
572
573const struct gfs2_glock_operations gfs2_nondisk_glops = {
574 .go_type = LM_TYPE_NONDISK,
575};
576
577const struct gfs2_glock_operations gfs2_quota_glops = {
578 .go_type = LM_TYPE_QUOTA,
579};
580
581const struct gfs2_glock_operations gfs2_journal_glops = {
582 .go_type = LM_TYPE_JOURNAL,
583};
584
585const struct gfs2_glock_operations *gfs2_glops_list[] = {
586 [LM_TYPE_META] = &gfs2_meta_glops,
587 [LM_TYPE_INODE] = &gfs2_inode_glops,
588 [LM_TYPE_RGRP] = &gfs2_rgrp_glops,
589 [LM_TYPE_IOPEN] = &gfs2_iopen_glops,
590 [LM_TYPE_FLOCK] = &gfs2_flock_glops,
591 [LM_TYPE_NONDISK] = &gfs2_nondisk_glops,
592 [LM_TYPE_QUOTA] = &gfs2_quota_glops,
593 [LM_TYPE_JOURNAL] = &gfs2_journal_glops,
594};
595