2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
3 * Copyright (C) 2004-2008 Red Hat, Inc. All rights reserved.
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.
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>
31 struct workqueue_struct *gfs2_freeze_wq;
33 static void gfs2_ail_error(struct gfs2_glock *gl, const struct buffer_head *bh)
35 fs_err(gl->gl_name.ln_sbd,
36 "AIL buffer %p: blocknr %llu state 0x%08lx mapping %p page "
38 bh, (unsigned long long)bh->b_blocknr, bh->b_state,
39 bh->b_page->mapping, bh->b_page->flags);
40 fs_err(gl->gl_name.ln_sbd, "AIL glock %u:%llu mapping %p\n",
41 gl->gl_name.ln_type, gl->gl_name.ln_number,
42 gfs2_glock2aspace(gl));
43 gfs2_lm_withdraw(gl->gl_name.ln_sbd, "AIL error\n");
47 * __gfs2_ail_flush - remove all buffers for a given lock from the AIL
49 * @fsync: set when called from fsync (not all buffers will be clean)
51 * None of the buffers should be dirty, locked, or pinned.
54 static void __gfs2_ail_flush(struct gfs2_glock *gl, bool fsync,
55 unsigned int nr_revokes)
57 struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
58 struct list_head *head = &gl->gl_ail_list;
59 struct gfs2_bufdata *bd, *tmp;
60 struct buffer_head *bh;
61 const unsigned long b_state = (1UL << BH_Dirty)|(1UL << BH_Pinned)|(1UL << BH_Lock);
64 spin_lock(&sdp->sd_ail_lock);
65 list_for_each_entry_safe_reverse(bd, tmp, head, bd_ail_gl_list) {
69 if (bh->b_state & b_state) {
72 gfs2_ail_error(gl, bh);
74 gfs2_trans_add_revoke(sdp, bd);
77 GLOCK_BUG_ON(gl, !fsync && atomic_read(&gl->gl_ail_count));
78 spin_unlock(&sdp->sd_ail_lock);
83 static void gfs2_ail_empty_gl(struct gfs2_glock *gl)
85 struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
88 memset(&tr, 0, sizeof(tr));
89 INIT_LIST_HEAD(&tr.tr_buf);
90 INIT_LIST_HEAD(&tr.tr_databuf);
91 tr.tr_revokes = atomic_read(&gl->gl_ail_count);
96 /* A shortened, inline version of gfs2_trans_begin()
97 * tr->alloced is not set since the transaction structure is
99 tr.tr_reserved = 1 + gfs2_struct2blk(sdp, tr.tr_revokes, sizeof(u64));
101 if (gfs2_log_reserve(sdp, tr.tr_reserved) < 0)
103 WARN_ON_ONCE(current->journal_info);
104 current->journal_info = &tr;
106 __gfs2_ail_flush(gl, 0, tr.tr_revokes);
109 gfs2_log_flush(sdp, NULL, NORMAL_FLUSH);
112 void gfs2_ail_flush(struct gfs2_glock *gl, bool fsync)
114 struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
115 unsigned int revokes = atomic_read(&gl->gl_ail_count);
116 unsigned int max_revokes = (sdp->sd_sb.sb_bsize - sizeof(struct gfs2_log_descriptor)) / sizeof(u64);
122 while (revokes > max_revokes)
123 max_revokes += (sdp->sd_sb.sb_bsize - sizeof(struct gfs2_meta_header)) / sizeof(u64);
125 ret = gfs2_trans_begin(sdp, 0, max_revokes);
128 __gfs2_ail_flush(gl, fsync, max_revokes);
130 gfs2_log_flush(sdp, NULL, NORMAL_FLUSH);
134 * rgrp_go_sync - sync out the metadata for this glock
137 * Called when demoting or unlocking an EX glock. We must flush
138 * to disk all dirty buffers/pages relating to this glock, and must not
139 * not return to caller to demote/unlock the glock until I/O is complete.
142 static void rgrp_go_sync(struct gfs2_glock *gl)
144 struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
145 struct address_space *mapping = &sdp->sd_aspace;
146 struct gfs2_rgrpd *rgd;
149 spin_lock(&gl->gl_spin);
152 gfs2_rgrp_brelse(rgd);
153 spin_unlock(&gl->gl_spin);
155 if (!test_and_clear_bit(GLF_DIRTY, &gl->gl_flags))
157 GLOCK_BUG_ON(gl, gl->gl_state != LM_ST_EXCLUSIVE);
159 gfs2_log_flush(sdp, gl, NORMAL_FLUSH);
160 filemap_fdatawrite_range(mapping, gl->gl_vm.start, gl->gl_vm.end);
161 error = filemap_fdatawait_range(mapping, gl->gl_vm.start, gl->gl_vm.end);
162 mapping_set_error(mapping, error);
163 gfs2_ail_empty_gl(gl);
165 spin_lock(&gl->gl_spin);
168 gfs2_free_clones(rgd);
169 spin_unlock(&gl->gl_spin);
173 * rgrp_go_inval - invalidate the metadata for this glock
177 * We never used LM_ST_DEFERRED with resource groups, so that we
178 * should always see the metadata flag set here.
182 static void rgrp_go_inval(struct gfs2_glock *gl, int flags)
184 struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
185 struct address_space *mapping = &sdp->sd_aspace;
186 struct gfs2_rgrpd *rgd = gl->gl_object;
189 gfs2_rgrp_brelse(rgd);
191 WARN_ON_ONCE(!(flags & DIO_METADATA));
192 gfs2_assert_withdraw(sdp, !atomic_read(&gl->gl_ail_count));
193 truncate_inode_pages_range(mapping, gl->gl_vm.start, gl->gl_vm.end);
196 rgd->rd_flags &= ~GFS2_RDF_UPTODATE;
200 * inode_go_sync - Sync the dirty data and/or metadata for an inode glock
201 * @gl: the glock protecting the inode
205 static void inode_go_sync(struct gfs2_glock *gl)
207 struct gfs2_inode *ip = gl->gl_object;
208 struct address_space *metamapping = gfs2_glock2aspace(gl);
211 if (ip && !S_ISREG(ip->i_inode.i_mode))
214 if (test_and_clear_bit(GIF_SW_PAGED, &ip->i_flags))
215 unmap_shared_mapping_range(ip->i_inode.i_mapping, 0, 0);
216 inode_dio_wait(&ip->i_inode);
218 if (!test_and_clear_bit(GLF_DIRTY, &gl->gl_flags))
221 GLOCK_BUG_ON(gl, gl->gl_state != LM_ST_EXCLUSIVE);
223 gfs2_log_flush(gl->gl_name.ln_sbd, gl, NORMAL_FLUSH);
224 filemap_fdatawrite(metamapping);
226 struct address_space *mapping = ip->i_inode.i_mapping;
227 filemap_fdatawrite(mapping);
228 error = filemap_fdatawait(mapping);
229 mapping_set_error(mapping, error);
231 error = filemap_fdatawait(metamapping);
232 mapping_set_error(metamapping, error);
233 gfs2_ail_empty_gl(gl);
235 * Writeback of the data mapping may cause the dirty flag to be set
236 * so we have to clear it again here.
238 smp_mb__before_atomic();
239 clear_bit(GLF_DIRTY, &gl->gl_flags);
243 * inode_go_inval - prepare a inode glock to be released
247 * Normally we invalidate everything, but if we are moving into
248 * LM_ST_DEFERRED from LM_ST_SHARED or LM_ST_EXCLUSIVE then we
249 * can keep hold of the metadata, since it won't have changed.
253 static void inode_go_inval(struct gfs2_glock *gl, int flags)
255 struct gfs2_inode *ip = gl->gl_object;
257 gfs2_assert_withdraw(gl->gl_name.ln_sbd, !atomic_read(&gl->gl_ail_count));
259 if (flags & DIO_METADATA) {
260 struct address_space *mapping = gfs2_glock2aspace(gl);
261 truncate_inode_pages(mapping, 0);
263 set_bit(GIF_INVALID, &ip->i_flags);
264 forget_all_cached_acls(&ip->i_inode);
265 gfs2_dir_hash_inval(ip);
269 if (ip == GFS2_I(gl->gl_name.ln_sbd->sd_rindex)) {
270 gfs2_log_flush(gl->gl_name.ln_sbd, NULL, NORMAL_FLUSH);
271 gl->gl_name.ln_sbd->sd_rindex_uptodate = 0;
273 if (ip && S_ISREG(ip->i_inode.i_mode))
274 truncate_inode_pages(ip->i_inode.i_mapping, 0);
278 * inode_go_demote_ok - Check to see if it's ok to unlock an inode glock
281 * Returns: 1 if it's ok
284 static int inode_go_demote_ok(const struct gfs2_glock *gl)
286 struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
287 struct gfs2_holder *gh;
289 if (sdp->sd_jindex == gl->gl_object || sdp->sd_rindex == gl->gl_object)
292 if (!list_empty(&gl->gl_holders)) {
293 gh = list_entry(gl->gl_holders.next, struct gfs2_holder, gh_list);
294 if (gh->gh_list.next != &gl->gl_holders)
302 * gfs2_set_nlink - Set the inode's link count based on on-disk info
303 * @inode: The inode in question
304 * @nlink: The link count
306 * If the link count has hit zero, it must never be raised, whatever the
307 * on-disk inode might say. When new struct inodes are created the link
308 * count is set to 1, so that we can safely use this test even when reading
309 * in on disk information for the first time.
312 static void gfs2_set_nlink(struct inode *inode, u32 nlink)
315 * We will need to review setting the nlink count here in the
316 * light of the forthcoming ro bind mount work. This is a reminder
319 if ((inode->i_nlink != nlink) && (inode->i_nlink != 0)) {
323 set_nlink(inode, nlink);
327 static int gfs2_dinode_in(struct gfs2_inode *ip, const void *buf)
329 const struct gfs2_dinode *str = buf;
330 struct timespec atime;
333 if (unlikely(ip->i_no_addr != be64_to_cpu(str->di_num.no_addr)))
335 ip->i_no_formal_ino = be64_to_cpu(str->di_num.no_formal_ino);
336 ip->i_inode.i_mode = be32_to_cpu(str->di_mode);
337 ip->i_inode.i_rdev = 0;
338 switch (ip->i_inode.i_mode & S_IFMT) {
341 ip->i_inode.i_rdev = MKDEV(be32_to_cpu(str->di_major),
342 be32_to_cpu(str->di_minor));
346 i_uid_write(&ip->i_inode, be32_to_cpu(str->di_uid));
347 i_gid_write(&ip->i_inode, be32_to_cpu(str->di_gid));
348 gfs2_set_nlink(&ip->i_inode, be32_to_cpu(str->di_nlink));
349 i_size_write(&ip->i_inode, be64_to_cpu(str->di_size));
350 gfs2_set_inode_blocks(&ip->i_inode, be64_to_cpu(str->di_blocks));
351 atime.tv_sec = be64_to_cpu(str->di_atime);
352 atime.tv_nsec = be32_to_cpu(str->di_atime_nsec);
353 if (timespec_compare(&ip->i_inode.i_atime, &atime) < 0)
354 ip->i_inode.i_atime = atime;
355 ip->i_inode.i_mtime.tv_sec = be64_to_cpu(str->di_mtime);
356 ip->i_inode.i_mtime.tv_nsec = be32_to_cpu(str->di_mtime_nsec);
357 ip->i_inode.i_ctime.tv_sec = be64_to_cpu(str->di_ctime);
358 ip->i_inode.i_ctime.tv_nsec = be32_to_cpu(str->di_ctime_nsec);
360 ip->i_goal = be64_to_cpu(str->di_goal_meta);
361 ip->i_generation = be64_to_cpu(str->di_generation);
363 ip->i_diskflags = be32_to_cpu(str->di_flags);
364 ip->i_eattr = be64_to_cpu(str->di_eattr);
365 /* i_diskflags and i_eattr must be set before gfs2_set_inode_flags() */
366 gfs2_set_inode_flags(&ip->i_inode);
367 height = be16_to_cpu(str->di_height);
368 if (unlikely(height > GFS2_MAX_META_HEIGHT))
370 ip->i_height = (u8)height;
372 depth = be16_to_cpu(str->di_depth);
373 if (unlikely(depth > GFS2_DIR_MAX_DEPTH))
375 ip->i_depth = (u8)depth;
376 ip->i_entries = be32_to_cpu(str->di_entries);
378 if (S_ISREG(ip->i_inode.i_mode))
379 gfs2_set_aops(&ip->i_inode);
383 gfs2_consist_inode(ip);
388 * gfs2_inode_refresh - Refresh the incore copy of the dinode
389 * @ip: The GFS2 inode
394 int gfs2_inode_refresh(struct gfs2_inode *ip)
396 struct buffer_head *dibh;
399 error = gfs2_meta_inode_buffer(ip, &dibh);
403 error = gfs2_dinode_in(ip, dibh->b_data);
405 clear_bit(GIF_INVALID, &ip->i_flags);
411 * inode_go_lock - operation done after an inode lock is locked by a process
418 static int inode_go_lock(struct gfs2_holder *gh)
420 struct gfs2_glock *gl = gh->gh_gl;
421 struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
422 struct gfs2_inode *ip = gl->gl_object;
425 if (!ip || (gh->gh_flags & GL_SKIP))
428 if (test_bit(GIF_INVALID, &ip->i_flags)) {
429 error = gfs2_inode_refresh(ip);
434 if (gh->gh_state != LM_ST_DEFERRED)
435 inode_dio_wait(&ip->i_inode);
437 if ((ip->i_diskflags & GFS2_DIF_TRUNC_IN_PROG) &&
438 (gl->gl_state == LM_ST_EXCLUSIVE) &&
439 (gh->gh_state == LM_ST_EXCLUSIVE)) {
440 spin_lock(&sdp->sd_trunc_lock);
441 if (list_empty(&ip->i_trunc_list))
442 list_add(&sdp->sd_trunc_list, &ip->i_trunc_list);
443 spin_unlock(&sdp->sd_trunc_lock);
444 wake_up(&sdp->sd_quota_wait);
452 * inode_go_dump - print information about an inode
458 static void inode_go_dump(struct seq_file *seq, const struct gfs2_glock *gl)
460 const struct gfs2_inode *ip = gl->gl_object;
463 gfs2_print_dbg(seq, " I: n:%llu/%llu t:%u f:0x%02lx d:0x%08x s:%llu\n",
464 (unsigned long long)ip->i_no_formal_ino,
465 (unsigned long long)ip->i_no_addr,
466 IF2DT(ip->i_inode.i_mode), ip->i_flags,
467 (unsigned int)ip->i_diskflags,
468 (unsigned long long)i_size_read(&ip->i_inode));
472 * freeze_go_sync - promote/demote the freeze glock
474 * @state: the requested state
479 static void freeze_go_sync(struct gfs2_glock *gl)
482 struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
484 if (gl->gl_state == LM_ST_SHARED &&
485 test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
486 atomic_set(&sdp->sd_freeze_state, SFS_STARTING_FREEZE);
487 error = freeze_super(sdp->sd_vfs);
489 printk(KERN_INFO "GFS2: couldn't freeze filesystem: %d\n", error);
490 gfs2_assert_withdraw(sdp, 0);
492 queue_work(gfs2_freeze_wq, &sdp->sd_freeze_work);
493 gfs2_log_flush(sdp, NULL, FREEZE_FLUSH);
498 * freeze_go_xmote_bh - After promoting/demoting the freeze glock
503 static int freeze_go_xmote_bh(struct gfs2_glock *gl, struct gfs2_holder *gh)
505 struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
506 struct gfs2_inode *ip = GFS2_I(sdp->sd_jdesc->jd_inode);
507 struct gfs2_glock *j_gl = ip->i_gl;
508 struct gfs2_log_header_host head;
511 if (test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
512 j_gl->gl_ops->go_inval(j_gl, DIO_METADATA);
514 error = gfs2_find_jhead(sdp->sd_jdesc, &head);
517 if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT))
520 /* Initialize some head of the log stuff */
521 if (!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) {
522 sdp->sd_log_sequence = head.lh_sequence + 1;
523 gfs2_log_pointers_init(sdp, head.lh_blkno);
536 static int freeze_go_demote_ok(const struct gfs2_glock *gl)
542 * iopen_go_callback - schedule the dcache entry for the inode to be deleted
545 * gl_spin lock is held while calling this
547 static void iopen_go_callback(struct gfs2_glock *gl, bool remote)
549 struct gfs2_inode *ip = (struct gfs2_inode *)gl->gl_object;
550 struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
552 if (!remote || (sdp->sd_vfs->s_flags & MS_RDONLY))
555 if (gl->gl_demote_state == LM_ST_UNLOCKED &&
556 gl->gl_state == LM_ST_SHARED && ip) {
557 gl->gl_lockref.count++;
558 if (queue_work(gfs2_delete_workqueue, &gl->gl_delete) == 0)
559 gl->gl_lockref.count--;
563 const struct gfs2_glock_operations gfs2_meta_glops = {
564 .go_type = LM_TYPE_META,
567 const struct gfs2_glock_operations gfs2_inode_glops = {
568 .go_sync = inode_go_sync,
569 .go_inval = inode_go_inval,
570 .go_demote_ok = inode_go_demote_ok,
571 .go_lock = inode_go_lock,
572 .go_dump = inode_go_dump,
573 .go_type = LM_TYPE_INODE,
574 .go_flags = GLOF_ASPACE | GLOF_LRU,
577 const struct gfs2_glock_operations gfs2_rgrp_glops = {
578 .go_sync = rgrp_go_sync,
579 .go_inval = rgrp_go_inval,
580 .go_lock = gfs2_rgrp_go_lock,
581 .go_unlock = gfs2_rgrp_go_unlock,
582 .go_dump = gfs2_rgrp_dump,
583 .go_type = LM_TYPE_RGRP,
584 .go_flags = GLOF_LVB,
587 const struct gfs2_glock_operations gfs2_freeze_glops = {
588 .go_sync = freeze_go_sync,
589 .go_xmote_bh = freeze_go_xmote_bh,
590 .go_demote_ok = freeze_go_demote_ok,
591 .go_type = LM_TYPE_NONDISK,
594 const struct gfs2_glock_operations gfs2_iopen_glops = {
595 .go_type = LM_TYPE_IOPEN,
596 .go_callback = iopen_go_callback,
597 .go_flags = GLOF_LRU,
600 const struct gfs2_glock_operations gfs2_flock_glops = {
601 .go_type = LM_TYPE_FLOCK,
602 .go_flags = GLOF_LRU,
605 const struct gfs2_glock_operations gfs2_nondisk_glops = {
606 .go_type = LM_TYPE_NONDISK,
609 const struct gfs2_glock_operations gfs2_quota_glops = {
610 .go_type = LM_TYPE_QUOTA,
611 .go_flags = GLOF_LVB | GLOF_LRU,
614 const struct gfs2_glock_operations gfs2_journal_glops = {
615 .go_type = LM_TYPE_JOURNAL,
618 const struct gfs2_glock_operations *gfs2_glops_list[] = {
619 [LM_TYPE_META] = &gfs2_meta_glops,
620 [LM_TYPE_INODE] = &gfs2_inode_glops,
621 [LM_TYPE_RGRP] = &gfs2_rgrp_glops,
622 [LM_TYPE_IOPEN] = &gfs2_iopen_glops,
623 [LM_TYPE_FLOCK] = &gfs2_flock_glops,
624 [LM_TYPE_NONDISK] = &gfs2_nondisk_glops,
625 [LM_TYPE_QUOTA] = &gfs2_quota_glops,
626 [LM_TYPE_JOURNAL] = &gfs2_journal_glops,