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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{
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
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
31/**
32 * __gfs2_ail_flush - remove all buffers for a given lock from the AIL
33 * @gl: the glock
34 *
35 * None of the buffers should be dirty, locked, or pinned.
36 */
37
38static void __gfs2_ail_flush(struct gfs2_glock *gl)
39{
40 struct gfs2_sbd *sdp = gl->gl_sbd;
41 struct list_head *head = &gl->gl_ail_list;
42 struct gfs2_bufdata *bd;
43 struct buffer_head *bh;
44
45 spin_lock(&sdp->sd_ail_lock);
46 while (!list_empty(head)) {
47 bd = list_entry(head->next, struct gfs2_bufdata,
48 bd_ail_gl_list);
49 bh = bd->bd_bh;
50 gfs2_remove_from_ail(bd);
51 bd->bd_bh = NULL;
52 bh->b_private = NULL;
53 spin_unlock(&sdp->sd_ail_lock);
54
55 bd->bd_blkno = bh->b_blocknr;
56 gfs2_log_lock(sdp);
57 gfs2_assert_withdraw(sdp, !buffer_busy(bh));
58 gfs2_trans_add_revoke(sdp, bd);
59 gfs2_log_unlock(sdp);
60
61 spin_lock(&sdp->sd_ail_lock);
62 }
63 gfs2_assert_withdraw(sdp, !atomic_read(&gl->gl_ail_count));
64 spin_unlock(&sdp->sd_ail_lock);
65}
66
67
68static void gfs2_ail_empty_gl(struct gfs2_glock *gl)
69{
70 struct gfs2_sbd *sdp = gl->gl_sbd;
71 struct gfs2_trans tr;
72
73 memset(&tr, 0, sizeof(tr));
74 tr.tr_revokes = atomic_read(&gl->gl_ail_count);
75
76 if (!tr.tr_revokes)
77 return;
78
79 /* A shortened, inline version of gfs2_trans_begin() */
80 tr.tr_reserved = 1 + gfs2_struct2blk(sdp, tr.tr_revokes, sizeof(u64));
81 tr.tr_ip = (unsigned long)__builtin_return_address(0);
82 INIT_LIST_HEAD(&tr.tr_list_buf);
83 gfs2_log_reserve(sdp, tr.tr_reserved);
84 BUG_ON(current->journal_info);
85 current->journal_info = &tr;
86
87 __gfs2_ail_flush(gl);
88
89 gfs2_trans_end(sdp);
90 gfs2_log_flush(sdp, NULL);
91}
92
93void gfs2_ail_flush(struct gfs2_glock *gl)
94{
95 struct gfs2_sbd *sdp = gl->gl_sbd;
96 unsigned int revokes = atomic_read(&gl->gl_ail_count);
97 int ret;
98
99 if (!revokes)
100 return;
101
102 ret = gfs2_trans_begin(sdp, 0, revokes);
103 if (ret)
104 return;
105 __gfs2_ail_flush(gl);
106 gfs2_trans_end(sdp);
107 gfs2_log_flush(sdp, NULL);
108}
109
110/**
111 * rgrp_go_sync - sync out the metadata for this glock
112 * @gl: the glock
113 *
114 * Called when demoting or unlocking an EX glock. We must flush
115 * to disk all dirty buffers/pages relating to this glock, and must not
116 * not return to caller to demote/unlock the glock until I/O is complete.
117 */
118
119static void rgrp_go_sync(struct gfs2_glock *gl)
120{
121 struct address_space *metamapping = gfs2_glock2aspace(gl);
122 int error;
123
124 if (!test_and_clear_bit(GLF_DIRTY, &gl->gl_flags))
125 return;
126 BUG_ON(gl->gl_state != LM_ST_EXCLUSIVE);
127
128 gfs2_log_flush(gl->gl_sbd, gl);
129 filemap_fdatawrite(metamapping);
130 error = filemap_fdatawait(metamapping);
131 mapping_set_error(metamapping, error);
132 gfs2_ail_empty_gl(gl);
133}
134
135/**
136 * rgrp_go_inval - invalidate the metadata for this glock
137 * @gl: the glock
138 * @flags:
139 *
140 * We never used LM_ST_DEFERRED with resource groups, so that we
141 * should always see the metadata flag set here.
142 *
143 */
144
145static void rgrp_go_inval(struct gfs2_glock *gl, int flags)
146{
147 struct address_space *mapping = gfs2_glock2aspace(gl);
148
149 BUG_ON(!(flags & DIO_METADATA));
150 gfs2_assert_withdraw(gl->gl_sbd, !atomic_read(&gl->gl_ail_count));
151 truncate_inode_pages(mapping, 0);
152
153 if (gl->gl_object) {
154 struct gfs2_rgrpd *rgd = (struct gfs2_rgrpd *)gl->gl_object;
155 rgd->rd_flags &= ~GFS2_RDF_UPTODATE;
156 }
157}
158
159/**
160 * inode_go_sync - Sync the dirty data and/or metadata for an inode glock
161 * @gl: the glock protecting the inode
162 *
163 */
164
165static void inode_go_sync(struct gfs2_glock *gl)
166{
167 struct gfs2_inode *ip = gl->gl_object;
168 struct address_space *metamapping = gfs2_glock2aspace(gl);
169 int error;
170
171 if (ip && !S_ISREG(ip->i_inode.i_mode))
172 ip = NULL;
173 if (ip && test_and_clear_bit(GIF_SW_PAGED, &ip->i_flags))
174 unmap_shared_mapping_range(ip->i_inode.i_mapping, 0, 0);
175 if (!test_and_clear_bit(GLF_DIRTY, &gl->gl_flags))
176 return;
177
178 BUG_ON(gl->gl_state != LM_ST_EXCLUSIVE);
179
180 gfs2_log_flush(gl->gl_sbd, gl);
181 filemap_fdatawrite(metamapping);
182 if (ip) {
183 struct address_space *mapping = ip->i_inode.i_mapping;
184 filemap_fdatawrite(mapping);
185 error = filemap_fdatawait(mapping);
186 mapping_set_error(mapping, error);
187 }
188 error = filemap_fdatawait(metamapping);
189 mapping_set_error(metamapping, error);
190 gfs2_ail_empty_gl(gl);
191 /*
192 * Writeback of the data mapping may cause the dirty flag to be set
193 * so we have to clear it again here.
194 */
195 smp_mb__before_clear_bit();
196 clear_bit(GLF_DIRTY, &gl->gl_flags);
197}
198
199/**
200 * inode_go_inval - prepare a inode glock to be released
201 * @gl: the glock
202 * @flags:
203 *
204 * Normally we invlidate everything, but if we are moving into
205 * LM_ST_DEFERRED from LM_ST_SHARED or LM_ST_EXCLUSIVE then we
206 * can keep hold of the metadata, since it won't have changed.
207 *
208 */
209
210static void inode_go_inval(struct gfs2_glock *gl, int flags)
211{
212 struct gfs2_inode *ip = gl->gl_object;
213
214 gfs2_assert_withdraw(gl->gl_sbd, !atomic_read(&gl->gl_ail_count));
215
216 if (flags & DIO_METADATA) {
217 struct address_space *mapping = gfs2_glock2aspace(gl);
218 truncate_inode_pages(mapping, 0);
219 if (ip) {
220 set_bit(GIF_INVALID, &ip->i_flags);
221 forget_all_cached_acls(&ip->i_inode);
222 gfs2_dir_hash_inval(ip);
223 }
224 }
225
226 if (ip == GFS2_I(gl->gl_sbd->sd_rindex)) {
227 gfs2_log_flush(gl->gl_sbd, NULL);
228 gl->gl_sbd->sd_rindex_uptodate = 0;
229 }
230 if (ip && S_ISREG(ip->i_inode.i_mode))
231 truncate_inode_pages(ip->i_inode.i_mapping, 0);
232}
233
234/**
235 * inode_go_demote_ok - Check to see if it's ok to unlock an inode glock
236 * @gl: the glock
237 *
238 * Returns: 1 if it's ok
239 */
240
241static int inode_go_demote_ok(const struct gfs2_glock *gl)
242{
243 struct gfs2_sbd *sdp = gl->gl_sbd;
244 struct gfs2_holder *gh;
245
246 if (sdp->sd_jindex == gl->gl_object || sdp->sd_rindex == gl->gl_object)
247 return 0;
248
249 if (!list_empty(&gl->gl_holders)) {
250 gh = list_entry(gl->gl_holders.next, struct gfs2_holder, gh_list);
251 if (gh->gh_list.next != &gl->gl_holders)
252 return 0;
253 }
254
255 return 1;
256}
257
258/**
259 * gfs2_set_nlink - Set the inode's link count based on on-disk info
260 * @inode: The inode in question
261 * @nlink: The link count
262 *
263 * If the link count has hit zero, it must never be raised, whatever the
264 * on-disk inode might say. When new struct inodes are created the link
265 * count is set to 1, so that we can safely use this test even when reading
266 * in on disk information for the first time.
267 */
268
269static void gfs2_set_nlink(struct inode *inode, u32 nlink)
270{
271 /*
272 * We will need to review setting the nlink count here in the
273 * light of the forthcoming ro bind mount work. This is a reminder
274 * to do that.
275 */
276 if ((inode->i_nlink != nlink) && (inode->i_nlink != 0)) {
277 if (nlink == 0)
278 clear_nlink(inode);
279 else
280 inode->i_nlink = nlink;
281 }
282}
283
284static int gfs2_dinode_in(struct gfs2_inode *ip, const void *buf)
285{
286 const struct gfs2_dinode *str = buf;
287 struct timespec atime;
288 u16 height, depth;
289
290 if (unlikely(ip->i_no_addr != be64_to_cpu(str->di_num.no_addr)))
291 goto corrupt;
292 ip->i_no_formal_ino = be64_to_cpu(str->di_num.no_formal_ino);
293 ip->i_inode.i_mode = be32_to_cpu(str->di_mode);
294 ip->i_inode.i_rdev = 0;
295 switch (ip->i_inode.i_mode & S_IFMT) {
296 case S_IFBLK:
297 case S_IFCHR:
298 ip->i_inode.i_rdev = MKDEV(be32_to_cpu(str->di_major),
299 be32_to_cpu(str->di_minor));
300 break;
301 };
302
303 ip->i_inode.i_uid = be32_to_cpu(str->di_uid);
304 ip->i_inode.i_gid = be32_to_cpu(str->di_gid);
305 gfs2_set_nlink(&ip->i_inode, be32_to_cpu(str->di_nlink));
306 i_size_write(&ip->i_inode, be64_to_cpu(str->di_size));
307 gfs2_set_inode_blocks(&ip->i_inode, be64_to_cpu(str->di_blocks));
308 atime.tv_sec = be64_to_cpu(str->di_atime);
309 atime.tv_nsec = be32_to_cpu(str->di_atime_nsec);
310 if (timespec_compare(&ip->i_inode.i_atime, &atime) < 0)
311 ip->i_inode.i_atime = atime;
312 ip->i_inode.i_mtime.tv_sec = be64_to_cpu(str->di_mtime);
313 ip->i_inode.i_mtime.tv_nsec = be32_to_cpu(str->di_mtime_nsec);
314 ip->i_inode.i_ctime.tv_sec = be64_to_cpu(str->di_ctime);
315 ip->i_inode.i_ctime.tv_nsec = be32_to_cpu(str->di_ctime_nsec);
316
317 ip->i_goal = be64_to_cpu(str->di_goal_meta);
318 ip->i_generation = be64_to_cpu(str->di_generation);
319
320 ip->i_diskflags = be32_to_cpu(str->di_flags);
321 ip->i_eattr = be64_to_cpu(str->di_eattr);
322 /* i_diskflags and i_eattr must be set before gfs2_set_inode_flags() */
323 gfs2_set_inode_flags(&ip->i_inode);
324 height = be16_to_cpu(str->di_height);
325 if (unlikely(height > GFS2_MAX_META_HEIGHT))
326 goto corrupt;
327 ip->i_height = (u8)height;
328
329 depth = be16_to_cpu(str->di_depth);
330 if (unlikely(depth > GFS2_DIR_MAX_DEPTH))
331 goto corrupt;
332 ip->i_depth = (u8)depth;
333 ip->i_entries = be32_to_cpu(str->di_entries);
334
335 if (S_ISREG(ip->i_inode.i_mode))
336 gfs2_set_aops(&ip->i_inode);
337
338 return 0;
339corrupt:
340 gfs2_consist_inode(ip);
341 return -EIO;
342}
343
344/**
345 * gfs2_inode_refresh - Refresh the incore copy of the dinode
346 * @ip: The GFS2 inode
347 *
348 * Returns: errno
349 */
350
351int gfs2_inode_refresh(struct gfs2_inode *ip)
352{
353 struct buffer_head *dibh;
354 int error;
355
356 error = gfs2_meta_inode_buffer(ip, &dibh);
357 if (error)
358 return error;
359
360 if (gfs2_metatype_check(GFS2_SB(&ip->i_inode), dibh, GFS2_METATYPE_DI)) {
361 brelse(dibh);
362 return -EIO;
363 }
364
365 error = gfs2_dinode_in(ip, dibh->b_data);
366 brelse(dibh);
367 clear_bit(GIF_INVALID, &ip->i_flags);
368
369 return error;
370}
371
372/**
373 * inode_go_lock - operation done after an inode lock is locked by a process
374 * @gl: the glock
375 * @flags:
376 *
377 * Returns: errno
378 */
379
380static int inode_go_lock(struct gfs2_holder *gh)
381{
382 struct gfs2_glock *gl = gh->gh_gl;
383 struct gfs2_sbd *sdp = gl->gl_sbd;
384 struct gfs2_inode *ip = gl->gl_object;
385 int error = 0;
386
387 if (!ip || (gh->gh_flags & GL_SKIP))
388 return 0;
389
390 if (test_bit(GIF_INVALID, &ip->i_flags)) {
391 error = gfs2_inode_refresh(ip);
392 if (error)
393 return error;
394 }
395
396 if ((ip->i_diskflags & GFS2_DIF_TRUNC_IN_PROG) &&
397 (gl->gl_state == LM_ST_EXCLUSIVE) &&
398 (gh->gh_state == LM_ST_EXCLUSIVE)) {
399 spin_lock(&sdp->sd_trunc_lock);
400 if (list_empty(&ip->i_trunc_list))
401 list_add(&sdp->sd_trunc_list, &ip->i_trunc_list);
402 spin_unlock(&sdp->sd_trunc_lock);
403 wake_up(&sdp->sd_quota_wait);
404 return 1;
405 }
406
407 return error;
408}
409
410/**
411 * inode_go_dump - print information about an inode
412 * @seq: The iterator
413 * @ip: the inode
414 *
415 * Returns: 0 on success, -ENOBUFS when we run out of space
416 */
417
418static int inode_go_dump(struct seq_file *seq, const struct gfs2_glock *gl)
419{
420 const struct gfs2_inode *ip = gl->gl_object;
421 if (ip == NULL)
422 return 0;
423 gfs2_print_dbg(seq, " I: n:%llu/%llu t:%u f:0x%02lx d:0x%08x s:%llu\n",
424 (unsigned long long)ip->i_no_formal_ino,
425 (unsigned long long)ip->i_no_addr,
426 IF2DT(ip->i_inode.i_mode), ip->i_flags,
427 (unsigned int)ip->i_diskflags,
428 (unsigned long long)i_size_read(&ip->i_inode));
429 return 0;
430}
431
432/**
433 * rgrp_go_lock - operation done after an rgrp lock is locked by
434 * a first holder on this node.
435 * @gl: the glock
436 * @flags:
437 *
438 * Returns: errno
439 */
440
441static int rgrp_go_lock(struct gfs2_holder *gh)
442{
443 return gfs2_rgrp_bh_get(gh->gh_gl->gl_object);
444}
445
446/**
447 * rgrp_go_unlock - operation done before an rgrp lock is unlocked by
448 * a last holder on this node.
449 * @gl: the glock
450 * @flags:
451 *
452 */
453
454static void rgrp_go_unlock(struct gfs2_holder *gh)
455{
456 gfs2_rgrp_bh_put(gh->gh_gl->gl_object);
457}
458
459/**
460 * trans_go_sync - promote/demote the transaction glock
461 * @gl: the glock
462 * @state: the requested state
463 * @flags:
464 *
465 */
466
467static void trans_go_sync(struct gfs2_glock *gl)
468{
469 struct gfs2_sbd *sdp = gl->gl_sbd;
470
471 if (gl->gl_state != LM_ST_UNLOCKED &&
472 test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
473 gfs2_meta_syncfs(sdp);
474 gfs2_log_shutdown(sdp);
475 }
476}
477
478/**
479 * trans_go_xmote_bh - After promoting/demoting the transaction glock
480 * @gl: the glock
481 *
482 */
483
484static int trans_go_xmote_bh(struct gfs2_glock *gl, struct gfs2_holder *gh)
485{
486 struct gfs2_sbd *sdp = gl->gl_sbd;
487 struct gfs2_inode *ip = GFS2_I(sdp->sd_jdesc->jd_inode);
488 struct gfs2_glock *j_gl = ip->i_gl;
489 struct gfs2_log_header_host head;
490 int error;
491
492 if (test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
493 j_gl->gl_ops->go_inval(j_gl, DIO_METADATA);
494
495 error = gfs2_find_jhead(sdp->sd_jdesc, &head);
496 if (error)
497 gfs2_consist(sdp);
498 if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT))
499 gfs2_consist(sdp);
500
501 /* Initialize some head of the log stuff */
502 if (!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) {
503 sdp->sd_log_sequence = head.lh_sequence + 1;
504 gfs2_log_pointers_init(sdp, head.lh_blkno);
505 }
506 }
507 return 0;
508}
509
510/**
511 * trans_go_demote_ok
512 * @gl: the glock
513 *
514 * Always returns 0
515 */
516
517static int trans_go_demote_ok(const struct gfs2_glock *gl)
518{
519 return 0;
520}
521
522/**
523 * iopen_go_callback - schedule the dcache entry for the inode to be deleted
524 * @gl: the glock
525 *
526 * gl_spin lock is held while calling this
527 */
528static void iopen_go_callback(struct gfs2_glock *gl)
529{
530 struct gfs2_inode *ip = (struct gfs2_inode *)gl->gl_object;
531 struct gfs2_sbd *sdp = gl->gl_sbd;
532
533 if (sdp->sd_vfs->s_flags & MS_RDONLY)
534 return;
535
536 if (gl->gl_demote_state == LM_ST_UNLOCKED &&
537 gl->gl_state == LM_ST_SHARED && ip) {
538 gfs2_glock_hold(gl);
539 if (queue_work(gfs2_delete_workqueue, &gl->gl_delete) == 0)
540 gfs2_glock_put_nolock(gl);
541 }
542}
543
544const struct gfs2_glock_operations gfs2_meta_glops = {
545 .go_type = LM_TYPE_META,
546};
547
548const struct gfs2_glock_operations gfs2_inode_glops = {
549 .go_xmote_th = inode_go_sync,
550 .go_inval = inode_go_inval,
551 .go_demote_ok = inode_go_demote_ok,
552 .go_lock = inode_go_lock,
553 .go_dump = inode_go_dump,
554 .go_type = LM_TYPE_INODE,
555 .go_flags = GLOF_ASPACE,
556};
557
558const struct gfs2_glock_operations gfs2_rgrp_glops = {
559 .go_xmote_th = rgrp_go_sync,
560 .go_inval = rgrp_go_inval,
561 .go_lock = rgrp_go_lock,
562 .go_unlock = rgrp_go_unlock,
563 .go_dump = gfs2_rgrp_dump,
564 .go_type = LM_TYPE_RGRP,
565 .go_flags = GLOF_ASPACE,
566};
567
568const struct gfs2_glock_operations gfs2_trans_glops = {
569 .go_xmote_th = trans_go_sync,
570 .go_xmote_bh = trans_go_xmote_bh,
571 .go_demote_ok = trans_go_demote_ok,
572 .go_type = LM_TYPE_NONDISK,
573};
574
575const struct gfs2_glock_operations gfs2_iopen_glops = {
576 .go_type = LM_TYPE_IOPEN,
577 .go_callback = iopen_go_callback,
578};
579
580const struct gfs2_glock_operations gfs2_flock_glops = {
581 .go_type = LM_TYPE_FLOCK,
582};
583
584const struct gfs2_glock_operations gfs2_nondisk_glops = {
585 .go_type = LM_TYPE_NONDISK,
586};
587
588const struct gfs2_glock_operations gfs2_quota_glops = {
589 .go_type = LM_TYPE_QUOTA,
590};
591
592const struct gfs2_glock_operations gfs2_journal_glops = {
593 .go_type = LM_TYPE_JOURNAL,
594};
595
596const struct gfs2_glock_operations *gfs2_glops_list[] = {
597 [LM_TYPE_META] = &gfs2_meta_glops,
598 [LM_TYPE_INODE] = &gfs2_inode_glops,
599 [LM_TYPE_RGRP] = &gfs2_rgrp_glops,
600 [LM_TYPE_IOPEN] = &gfs2_iopen_glops,
601 [LM_TYPE_FLOCK] = &gfs2_flock_glops,
602 [LM_TYPE_NONDISK] = &gfs2_nondisk_glops,
603 [LM_TYPE_QUOTA] = &gfs2_quota_glops,
604 [LM_TYPE_JOURNAL] = &gfs2_journal_glops,
605};
606