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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#include <linux/security.h>
17
18#include "gfs2.h"
19#include "incore.h"
20#include "bmap.h"
21#include "glock.h"
22#include "glops.h"
23#include "inode.h"
24#include "log.h"
25#include "meta_io.h"
26#include "recovery.h"
27#include "rgrp.h"
28#include "util.h"
29#include "trans.h"
30#include "dir.h"
31
32struct workqueue_struct *gfs2_freeze_wq;
33
34static 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_withdraw(gl->gl_name.ln_sbd, "AIL error\n");
45}
46
47/**
48 * __gfs2_ail_flush - remove all buffers for a given lock from the AIL
49 * @gl: the glock
50 * @fsync: set when called from fsync (not all buffers will be clean)
51 *
52 * None of the buffers should be dirty, locked, or pinned.
53 */
54
55static void __gfs2_ail_flush(struct gfs2_glock *gl, bool fsync,
56 unsigned int nr_revokes)
57{
58 struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
59 struct list_head *head = &gl->gl_ail_list;
60 struct gfs2_bufdata *bd, *tmp;
61 struct buffer_head *bh;
62 const unsigned long b_state = (1UL << BH_Dirty)|(1UL << BH_Pinned)|(1UL << BH_Lock);
63
64 gfs2_log_lock(sdp);
65 spin_lock(&sdp->sd_ail_lock);
66 list_for_each_entry_safe_reverse(bd, tmp, head, bd_ail_gl_list) {
67 if (nr_revokes == 0)
68 break;
69 bh = bd->bd_bh;
70 if (bh->b_state & b_state) {
71 if (fsync)
72 continue;
73 gfs2_ail_error(gl, bh);
74 }
75 gfs2_trans_add_revoke(sdp, bd);
76 nr_revokes--;
77 }
78 GLOCK_BUG_ON(gl, !fsync && atomic_read(&gl->gl_ail_count));
79 spin_unlock(&sdp->sd_ail_lock);
80 gfs2_log_unlock(sdp);
81}
82
83
84static void gfs2_ail_empty_gl(struct gfs2_glock *gl)
85{
86 struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
87 struct gfs2_trans tr;
88
89 memset(&tr, 0, sizeof(tr));
90 INIT_LIST_HEAD(&tr.tr_buf);
91 INIT_LIST_HEAD(&tr.tr_databuf);
92 tr.tr_revokes = atomic_read(&gl->gl_ail_count);
93
94 if (!tr.tr_revokes)
95 return;
96
97 /* A shortened, inline version of gfs2_trans_begin()
98 * tr->alloced is not set since the transaction structure is
99 * on the stack */
100 tr.tr_reserved = 1 + gfs2_struct2blk(sdp, tr.tr_revokes, sizeof(u64));
101 tr.tr_ip = _RET_IP_;
102 if (gfs2_log_reserve(sdp, tr.tr_reserved) < 0)
103 return;
104 WARN_ON_ONCE(current->journal_info);
105 current->journal_info = &tr;
106
107 __gfs2_ail_flush(gl, 0, tr.tr_revokes);
108
109 gfs2_trans_end(sdp);
110 gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_NORMAL |
111 GFS2_LFC_AIL_EMPTY_GL);
112}
113
114void gfs2_ail_flush(struct gfs2_glock *gl, bool fsync)
115{
116 struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
117 unsigned int revokes = atomic_read(&gl->gl_ail_count);
118 unsigned int max_revokes = (sdp->sd_sb.sb_bsize - sizeof(struct gfs2_log_descriptor)) / sizeof(u64);
119 int ret;
120
121 if (!revokes)
122 return;
123
124 while (revokes > max_revokes)
125 max_revokes += (sdp->sd_sb.sb_bsize - sizeof(struct gfs2_meta_header)) / sizeof(u64);
126
127 ret = gfs2_trans_begin(sdp, 0, max_revokes);
128 if (ret)
129 return;
130 __gfs2_ail_flush(gl, fsync, max_revokes);
131 gfs2_trans_end(sdp);
132 gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_NORMAL |
133 GFS2_LFC_AIL_FLUSH);
134}
135
136/**
137 * rgrp_go_sync - sync out the metadata for this glock
138 * @gl: the glock
139 *
140 * Called when demoting or unlocking an EX glock. We must flush
141 * to disk all dirty buffers/pages relating to this glock, and must not
142 * return to caller to demote/unlock the glock until I/O is complete.
143 */
144
145static void rgrp_go_sync(struct gfs2_glock *gl)
146{
147 struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
148 struct address_space *mapping = &sdp->sd_aspace;
149 struct gfs2_rgrpd *rgd;
150 int error;
151
152 spin_lock(&gl->gl_lockref.lock);
153 rgd = gl->gl_object;
154 if (rgd)
155 gfs2_rgrp_brelse(rgd);
156 spin_unlock(&gl->gl_lockref.lock);
157
158 if (!test_and_clear_bit(GLF_DIRTY, &gl->gl_flags))
159 return;
160 GLOCK_BUG_ON(gl, gl->gl_state != LM_ST_EXCLUSIVE);
161
162 gfs2_log_flush(sdp, gl, GFS2_LOG_HEAD_FLUSH_NORMAL |
163 GFS2_LFC_RGRP_GO_SYNC);
164 filemap_fdatawrite_range(mapping, gl->gl_vm.start, gl->gl_vm.end);
165 error = filemap_fdatawait_range(mapping, gl->gl_vm.start, gl->gl_vm.end);
166 mapping_set_error(mapping, error);
167 gfs2_ail_empty_gl(gl);
168
169 spin_lock(&gl->gl_lockref.lock);
170 rgd = gl->gl_object;
171 if (rgd)
172 gfs2_free_clones(rgd);
173 spin_unlock(&gl->gl_lockref.lock);
174}
175
176/**
177 * rgrp_go_inval - invalidate the metadata for this glock
178 * @gl: the glock
179 * @flags:
180 *
181 * We never used LM_ST_DEFERRED with resource groups, so that we
182 * should always see the metadata flag set here.
183 *
184 */
185
186static void rgrp_go_inval(struct gfs2_glock *gl, int flags)
187{
188 struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
189 struct address_space *mapping = &sdp->sd_aspace;
190 struct gfs2_rgrpd *rgd = gfs2_glock2rgrp(gl);
191
192 if (rgd)
193 gfs2_rgrp_brelse(rgd);
194
195 WARN_ON_ONCE(!(flags & DIO_METADATA));
196 gfs2_assert_withdraw(sdp, !atomic_read(&gl->gl_ail_count));
197 truncate_inode_pages_range(mapping, gl->gl_vm.start, gl->gl_vm.end);
198
199 if (rgd)
200 rgd->rd_flags &= ~GFS2_RDF_UPTODATE;
201}
202
203static struct gfs2_inode *gfs2_glock2inode(struct gfs2_glock *gl)
204{
205 struct gfs2_inode *ip;
206
207 spin_lock(&gl->gl_lockref.lock);
208 ip = gl->gl_object;
209 if (ip)
210 set_bit(GIF_GLOP_PENDING, &ip->i_flags);
211 spin_unlock(&gl->gl_lockref.lock);
212 return ip;
213}
214
215struct gfs2_rgrpd *gfs2_glock2rgrp(struct gfs2_glock *gl)
216{
217 struct gfs2_rgrpd *rgd;
218
219 spin_lock(&gl->gl_lockref.lock);
220 rgd = gl->gl_object;
221 spin_unlock(&gl->gl_lockref.lock);
222
223 return rgd;
224}
225
226static void gfs2_clear_glop_pending(struct gfs2_inode *ip)
227{
228 if (!ip)
229 return;
230
231 clear_bit_unlock(GIF_GLOP_PENDING, &ip->i_flags);
232 wake_up_bit(&ip->i_flags, GIF_GLOP_PENDING);
233}
234
235/**
236 * inode_go_sync - Sync the dirty data and/or metadata for an inode glock
237 * @gl: the glock protecting the inode
238 *
239 */
240
241static void inode_go_sync(struct gfs2_glock *gl)
242{
243 struct gfs2_inode *ip = gfs2_glock2inode(gl);
244 int isreg = ip && S_ISREG(ip->i_inode.i_mode);
245 struct address_space *metamapping = gfs2_glock2aspace(gl);
246 int error;
247
248 if (isreg) {
249 if (test_and_clear_bit(GIF_SW_PAGED, &ip->i_flags))
250 unmap_shared_mapping_range(ip->i_inode.i_mapping, 0, 0);
251 inode_dio_wait(&ip->i_inode);
252 }
253 if (!test_and_clear_bit(GLF_DIRTY, &gl->gl_flags))
254 goto out;
255
256 GLOCK_BUG_ON(gl, gl->gl_state != LM_ST_EXCLUSIVE);
257
258 gfs2_log_flush(gl->gl_name.ln_sbd, gl, GFS2_LOG_HEAD_FLUSH_NORMAL |
259 GFS2_LFC_INODE_GO_SYNC);
260 filemap_fdatawrite(metamapping);
261 if (isreg) {
262 struct address_space *mapping = ip->i_inode.i_mapping;
263 filemap_fdatawrite(mapping);
264 error = filemap_fdatawait(mapping);
265 mapping_set_error(mapping, error);
266 }
267 error = filemap_fdatawait(metamapping);
268 mapping_set_error(metamapping, error);
269 gfs2_ail_empty_gl(gl);
270 /*
271 * Writeback of the data mapping may cause the dirty flag to be set
272 * so we have to clear it again here.
273 */
274 smp_mb__before_atomic();
275 clear_bit(GLF_DIRTY, &gl->gl_flags);
276
277out:
278 gfs2_clear_glop_pending(ip);
279}
280
281/**
282 * inode_go_inval - prepare a inode glock to be released
283 * @gl: the glock
284 * @flags:
285 *
286 * Normally we invalidate everything, but if we are moving into
287 * LM_ST_DEFERRED from LM_ST_SHARED or LM_ST_EXCLUSIVE then we
288 * can keep hold of the metadata, since it won't have changed.
289 *
290 */
291
292static void inode_go_inval(struct gfs2_glock *gl, int flags)
293{
294 struct gfs2_inode *ip = gfs2_glock2inode(gl);
295
296 gfs2_assert_withdraw(gl->gl_name.ln_sbd, !atomic_read(&gl->gl_ail_count));
297
298 if (flags & DIO_METADATA) {
299 struct address_space *mapping = gfs2_glock2aspace(gl);
300 truncate_inode_pages(mapping, 0);
301 if (ip) {
302 set_bit(GIF_INVALID, &ip->i_flags);
303 forget_all_cached_acls(&ip->i_inode);
304 security_inode_invalidate_secctx(&ip->i_inode);
305 gfs2_dir_hash_inval(ip);
306 }
307 }
308
309 if (ip == GFS2_I(gl->gl_name.ln_sbd->sd_rindex)) {
310 gfs2_log_flush(gl->gl_name.ln_sbd, NULL,
311 GFS2_LOG_HEAD_FLUSH_NORMAL |
312 GFS2_LFC_INODE_GO_INVAL);
313 gl->gl_name.ln_sbd->sd_rindex_uptodate = 0;
314 }
315 if (ip && S_ISREG(ip->i_inode.i_mode))
316 truncate_inode_pages(ip->i_inode.i_mapping, 0);
317
318 gfs2_clear_glop_pending(ip);
319}
320
321/**
322 * inode_go_demote_ok - Check to see if it's ok to unlock an inode glock
323 * @gl: the glock
324 *
325 * Returns: 1 if it's ok
326 */
327
328static int inode_go_demote_ok(const struct gfs2_glock *gl)
329{
330 struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
331
332 if (sdp->sd_jindex == gl->gl_object || sdp->sd_rindex == gl->gl_object)
333 return 0;
334
335 return 1;
336}
337
338static int gfs2_dinode_in(struct gfs2_inode *ip, const void *buf)
339{
340 const struct gfs2_dinode *str = buf;
341 struct timespec atime;
342 u16 height, depth;
343
344 if (unlikely(ip->i_no_addr != be64_to_cpu(str->di_num.no_addr)))
345 goto corrupt;
346 ip->i_no_formal_ino = be64_to_cpu(str->di_num.no_formal_ino);
347 ip->i_inode.i_mode = be32_to_cpu(str->di_mode);
348 ip->i_inode.i_rdev = 0;
349 switch (ip->i_inode.i_mode & S_IFMT) {
350 case S_IFBLK:
351 case S_IFCHR:
352 ip->i_inode.i_rdev = MKDEV(be32_to_cpu(str->di_major),
353 be32_to_cpu(str->di_minor));
354 break;
355 };
356
357 i_uid_write(&ip->i_inode, be32_to_cpu(str->di_uid));
358 i_gid_write(&ip->i_inode, be32_to_cpu(str->di_gid));
359 set_nlink(&ip->i_inode, be32_to_cpu(str->di_nlink));
360 i_size_write(&ip->i_inode, be64_to_cpu(str->di_size));
361 gfs2_set_inode_blocks(&ip->i_inode, be64_to_cpu(str->di_blocks));
362 atime.tv_sec = be64_to_cpu(str->di_atime);
363 atime.tv_nsec = be32_to_cpu(str->di_atime_nsec);
364 if (timespec_compare(&ip->i_inode.i_atime, &atime) < 0)
365 ip->i_inode.i_atime = atime;
366 ip->i_inode.i_mtime.tv_sec = be64_to_cpu(str->di_mtime);
367 ip->i_inode.i_mtime.tv_nsec = be32_to_cpu(str->di_mtime_nsec);
368 ip->i_inode.i_ctime.tv_sec = be64_to_cpu(str->di_ctime);
369 ip->i_inode.i_ctime.tv_nsec = be32_to_cpu(str->di_ctime_nsec);
370
371 ip->i_goal = be64_to_cpu(str->di_goal_meta);
372 ip->i_generation = be64_to_cpu(str->di_generation);
373
374 ip->i_diskflags = be32_to_cpu(str->di_flags);
375 ip->i_eattr = be64_to_cpu(str->di_eattr);
376 /* i_diskflags and i_eattr must be set before gfs2_set_inode_flags() */
377 gfs2_set_inode_flags(&ip->i_inode);
378 height = be16_to_cpu(str->di_height);
379 if (unlikely(height > GFS2_MAX_META_HEIGHT))
380 goto corrupt;
381 ip->i_height = (u8)height;
382
383 depth = be16_to_cpu(str->di_depth);
384 if (unlikely(depth > GFS2_DIR_MAX_DEPTH))
385 goto corrupt;
386 ip->i_depth = (u8)depth;
387 ip->i_entries = be32_to_cpu(str->di_entries);
388
389 if (S_ISREG(ip->i_inode.i_mode))
390 gfs2_set_aops(&ip->i_inode);
391
392 return 0;
393corrupt:
394 gfs2_consist_inode(ip);
395 return -EIO;
396}
397
398/**
399 * gfs2_inode_refresh - Refresh the incore copy of the dinode
400 * @ip: The GFS2 inode
401 *
402 * Returns: errno
403 */
404
405int gfs2_inode_refresh(struct gfs2_inode *ip)
406{
407 struct buffer_head *dibh;
408 int error;
409
410 error = gfs2_meta_inode_buffer(ip, &dibh);
411 if (error)
412 return error;
413
414 error = gfs2_dinode_in(ip, dibh->b_data);
415 brelse(dibh);
416 clear_bit(GIF_INVALID, &ip->i_flags);
417
418 return error;
419}
420
421/**
422 * inode_go_lock - operation done after an inode lock is locked by a process
423 * @gl: the glock
424 * @flags:
425 *
426 * Returns: errno
427 */
428
429static int inode_go_lock(struct gfs2_holder *gh)
430{
431 struct gfs2_glock *gl = gh->gh_gl;
432 struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
433 struct gfs2_inode *ip = gl->gl_object;
434 int error = 0;
435
436 if (!ip || (gh->gh_flags & GL_SKIP))
437 return 0;
438
439 if (test_bit(GIF_INVALID, &ip->i_flags)) {
440 error = gfs2_inode_refresh(ip);
441 if (error)
442 return error;
443 }
444
445 if (gh->gh_state != LM_ST_DEFERRED)
446 inode_dio_wait(&ip->i_inode);
447
448 if ((ip->i_diskflags & GFS2_DIF_TRUNC_IN_PROG) &&
449 (gl->gl_state == LM_ST_EXCLUSIVE) &&
450 (gh->gh_state == LM_ST_EXCLUSIVE)) {
451 spin_lock(&sdp->sd_trunc_lock);
452 if (list_empty(&ip->i_trunc_list))
453 list_add(&ip->i_trunc_list, &sdp->sd_trunc_list);
454 spin_unlock(&sdp->sd_trunc_lock);
455 wake_up(&sdp->sd_quota_wait);
456 return 1;
457 }
458
459 return error;
460}
461
462/**
463 * inode_go_dump - print information about an inode
464 * @seq: The iterator
465 * @ip: the inode
466 *
467 */
468
469static void inode_go_dump(struct seq_file *seq, const struct gfs2_glock *gl)
470{
471 const struct gfs2_inode *ip = gl->gl_object;
472 if (ip == NULL)
473 return;
474 gfs2_print_dbg(seq, " I: n:%llu/%llu t:%u f:0x%02lx d:0x%08x s:%llu\n",
475 (unsigned long long)ip->i_no_formal_ino,
476 (unsigned long long)ip->i_no_addr,
477 IF2DT(ip->i_inode.i_mode), ip->i_flags,
478 (unsigned int)ip->i_diskflags,
479 (unsigned long long)i_size_read(&ip->i_inode));
480}
481
482/**
483 * freeze_go_sync - promote/demote the freeze glock
484 * @gl: the glock
485 * @state: the requested state
486 * @flags:
487 *
488 */
489
490static void freeze_go_sync(struct gfs2_glock *gl)
491{
492 int error = 0;
493 struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
494
495 if (gl->gl_state == LM_ST_SHARED &&
496 test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
497 atomic_set(&sdp->sd_freeze_state, SFS_STARTING_FREEZE);
498 error = freeze_super(sdp->sd_vfs);
499 if (error) {
500 printk(KERN_INFO "GFS2: couldn't freeze filesystem: %d\n", error);
501 gfs2_assert_withdraw(sdp, 0);
502 }
503 queue_work(gfs2_freeze_wq, &sdp->sd_freeze_work);
504 gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_FREEZE |
505 GFS2_LFC_FREEZE_GO_SYNC);
506 }
507}
508
509/**
510 * freeze_go_xmote_bh - After promoting/demoting the freeze glock
511 * @gl: the glock
512 *
513 */
514
515static int freeze_go_xmote_bh(struct gfs2_glock *gl, struct gfs2_holder *gh)
516{
517 struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
518 struct gfs2_inode *ip = GFS2_I(sdp->sd_jdesc->jd_inode);
519 struct gfs2_glock *j_gl = ip->i_gl;
520 struct gfs2_log_header_host head;
521 int error;
522
523 if (test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
524 j_gl->gl_ops->go_inval(j_gl, DIO_METADATA);
525
526 error = gfs2_find_jhead(sdp->sd_jdesc, &head);
527 if (error)
528 gfs2_consist(sdp);
529 if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT))
530 gfs2_consist(sdp);
531
532 /* Initialize some head of the log stuff */
533 if (!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) {
534 sdp->sd_log_sequence = head.lh_sequence + 1;
535 gfs2_log_pointers_init(sdp, head.lh_blkno);
536 }
537 }
538 return 0;
539}
540
541/**
542 * trans_go_demote_ok
543 * @gl: the glock
544 *
545 * Always returns 0
546 */
547
548static int freeze_go_demote_ok(const struct gfs2_glock *gl)
549{
550 return 0;
551}
552
553/**
554 * iopen_go_callback - schedule the dcache entry for the inode to be deleted
555 * @gl: the glock
556 *
557 * gl_lockref.lock lock is held while calling this
558 */
559static void iopen_go_callback(struct gfs2_glock *gl, bool remote)
560{
561 struct gfs2_inode *ip = gl->gl_object;
562 struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
563
564 if (!remote || sb_rdonly(sdp->sd_vfs))
565 return;
566
567 if (gl->gl_demote_state == LM_ST_UNLOCKED &&
568 gl->gl_state == LM_ST_SHARED && ip) {
569 gl->gl_lockref.count++;
570 if (queue_work(gfs2_delete_workqueue, &gl->gl_delete) == 0)
571 gl->gl_lockref.count--;
572 }
573}
574
575const struct gfs2_glock_operations gfs2_meta_glops = {
576 .go_type = LM_TYPE_META,
577};
578
579const struct gfs2_glock_operations gfs2_inode_glops = {
580 .go_sync = inode_go_sync,
581 .go_inval = inode_go_inval,
582 .go_demote_ok = inode_go_demote_ok,
583 .go_lock = inode_go_lock,
584 .go_dump = inode_go_dump,
585 .go_type = LM_TYPE_INODE,
586 .go_flags = GLOF_ASPACE | GLOF_LRU,
587};
588
589const struct gfs2_glock_operations gfs2_rgrp_glops = {
590 .go_sync = rgrp_go_sync,
591 .go_inval = rgrp_go_inval,
592 .go_lock = gfs2_rgrp_go_lock,
593 .go_unlock = gfs2_rgrp_go_unlock,
594 .go_dump = gfs2_rgrp_dump,
595 .go_type = LM_TYPE_RGRP,
596 .go_flags = GLOF_LVB,
597};
598
599const struct gfs2_glock_operations gfs2_freeze_glops = {
600 .go_sync = freeze_go_sync,
601 .go_xmote_bh = freeze_go_xmote_bh,
602 .go_demote_ok = freeze_go_demote_ok,
603 .go_type = LM_TYPE_NONDISK,
604};
605
606const struct gfs2_glock_operations gfs2_iopen_glops = {
607 .go_type = LM_TYPE_IOPEN,
608 .go_callback = iopen_go_callback,
609 .go_flags = GLOF_LRU,
610};
611
612const struct gfs2_glock_operations gfs2_flock_glops = {
613 .go_type = LM_TYPE_FLOCK,
614 .go_flags = GLOF_LRU,
615};
616
617const struct gfs2_glock_operations gfs2_nondisk_glops = {
618 .go_type = LM_TYPE_NONDISK,
619};
620
621const struct gfs2_glock_operations gfs2_quota_glops = {
622 .go_type = LM_TYPE_QUOTA,
623 .go_flags = GLOF_LVB | GLOF_LRU,
624};
625
626const struct gfs2_glock_operations gfs2_journal_glops = {
627 .go_type = LM_TYPE_JOURNAL,
628};
629
630const struct gfs2_glock_operations *gfs2_glops_list[] = {
631 [LM_TYPE_META] = &gfs2_meta_glops,
632 [LM_TYPE_INODE] = &gfs2_inode_glops,
633 [LM_TYPE_RGRP] = &gfs2_rgrp_glops,
634 [LM_TYPE_IOPEN] = &gfs2_iopen_glops,
635 [LM_TYPE_FLOCK] = &gfs2_flock_glops,
636 [LM_TYPE_NONDISK] = &gfs2_nondisk_glops,
637 [LM_TYPE_QUOTA] = &gfs2_quota_glops,
638 [LM_TYPE_JOURNAL] = &gfs2_journal_glops,
639};
640
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