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/slab.h>
11 #include <linux/spinlock.h>
12 #include <linux/completion.h>
13 #include <linux/buffer_head.h>
14 #include <linux/gfs2_ondisk.h>
15 #include <linux/bio.h>
31 * ail_empty_gl - remove all buffers for a given lock from the AIL
34 * None of the buffers should be dirty, locked, or pinned.
37 static void gfs2_ail_empty_gl(struct gfs2_glock *gl)
39 struct gfs2_sbd *sdp = gl->gl_sbd;
40 struct list_head *head = &gl->gl_ail_list;
41 struct gfs2_bufdata *bd;
42 struct buffer_head *bh;
45 memset(&tr, 0, sizeof(tr));
46 tr.tr_revokes = atomic_read(&gl->gl_ail_count);
51 /* A shortened, inline version of gfs2_trans_begin() */
52 tr.tr_reserved = 1 + gfs2_struct2blk(sdp, tr.tr_revokes, sizeof(u64));
53 tr.tr_ip = (unsigned long)__builtin_return_address(0);
54 INIT_LIST_HEAD(&tr.tr_list_buf);
55 gfs2_log_reserve(sdp, tr.tr_reserved);
56 BUG_ON(current->journal_info);
57 current->journal_info = &tr;
60 while (!list_empty(head)) {
61 bd = list_entry(head->next, struct gfs2_bufdata,
64 gfs2_remove_from_ail(bd);
67 bd->bd_blkno = bh->b_blocknr;
68 gfs2_assert_withdraw(sdp, !buffer_busy(bh));
69 gfs2_trans_add_revoke(sdp, bd);
71 gfs2_assert_withdraw(sdp, !atomic_read(&gl->gl_ail_count));
75 gfs2_log_flush(sdp, NULL);
79 * gfs2_pte_inval - Sync and invalidate all PTEs associated with a glock
84 static void gfs2_pte_inval(struct gfs2_glock *gl)
86 struct gfs2_inode *ip;
91 if (!ip || !S_ISREG(inode->i_mode))
94 unmap_shared_mapping_range(inode->i_mapping, 0, 0);
95 if (test_bit(GIF_SW_PAGED, &ip->i_flags))
96 set_bit(GLF_DIRTY, &gl->gl_flags);
101 * meta_go_sync - sync out the metadata for this glock
104 * Called when demoting or unlocking an EX glock. We must flush
105 * to disk all dirty buffers/pages relating to this glock, and must not
106 * not return to caller to demote/unlock the glock until I/O is complete.
109 static void meta_go_sync(struct gfs2_glock *gl)
111 if (gl->gl_state != LM_ST_EXCLUSIVE)
114 if (test_and_clear_bit(GLF_DIRTY, &gl->gl_flags)) {
115 gfs2_log_flush(gl->gl_sbd, gl);
117 gfs2_ail_empty_gl(gl);
122 * meta_go_inval - invalidate the metadata for this glock
128 static void meta_go_inval(struct gfs2_glock *gl, int flags)
130 if (!(flags & DIO_METADATA))
134 if (gl->gl_object == GFS2_I(gl->gl_sbd->sd_rindex))
135 gl->gl_sbd->sd_rindex_uptodate = 0;
136 else if (gl->gl_ops == &gfs2_rgrp_glops && gl->gl_object) {
137 struct gfs2_rgrpd *rgd = (struct gfs2_rgrpd *)gl->gl_object;
139 rgd->rd_flags &= ~GFS2_RDF_UPTODATE;
144 * inode_go_sync - Sync the dirty data and/or metadata for an inode glock
145 * @gl: the glock protecting the inode
149 static void inode_go_sync(struct gfs2_glock *gl)
151 struct gfs2_inode *ip = gl->gl_object;
152 struct address_space *metamapping = gl->gl_aspace->i_mapping;
155 if (gl->gl_state != LM_ST_UNLOCKED)
157 if (gl->gl_state != LM_ST_EXCLUSIVE)
160 if (ip && !S_ISREG(ip->i_inode.i_mode))
163 if (test_bit(GLF_DIRTY, &gl->gl_flags)) {
164 gfs2_log_flush(gl->gl_sbd, gl);
165 filemap_fdatawrite(metamapping);
167 struct address_space *mapping = ip->i_inode.i_mapping;
168 filemap_fdatawrite(mapping);
169 error = filemap_fdatawait(mapping);
170 mapping_set_error(mapping, error);
172 error = filemap_fdatawait(metamapping);
173 mapping_set_error(metamapping, error);
174 clear_bit(GLF_DIRTY, &gl->gl_flags);
175 gfs2_ail_empty_gl(gl);
180 * inode_go_inval - prepare a inode glock to be released
186 static void inode_go_inval(struct gfs2_glock *gl, int flags)
188 struct gfs2_inode *ip = gl->gl_object;
189 int meta = (flags & DIO_METADATA);
194 set_bit(GIF_INVALID, &ip->i_flags);
197 if (ip && S_ISREG(ip->i_inode.i_mode))
198 truncate_inode_pages(ip->i_inode.i_mapping, 0);
202 * inode_go_demote_ok - Check to see if it's ok to unlock an inode glock
205 * Returns: 1 if it's ok
208 static int inode_go_demote_ok(const struct gfs2_glock *gl)
210 struct gfs2_sbd *sdp = gl->gl_sbd;
211 if (sdp->sd_jindex == gl->gl_object || sdp->sd_rindex == gl->gl_object)
217 * inode_go_lock - operation done after an inode lock is locked by a process
224 static int inode_go_lock(struct gfs2_holder *gh)
226 struct gfs2_glock *gl = gh->gh_gl;
227 struct gfs2_sbd *sdp = gl->gl_sbd;
228 struct gfs2_inode *ip = gl->gl_object;
231 if (!ip || (gh->gh_flags & GL_SKIP))
234 if (test_bit(GIF_INVALID, &ip->i_flags)) {
235 error = gfs2_inode_refresh(ip);
240 if ((ip->i_diskflags & GFS2_DIF_TRUNC_IN_PROG) &&
241 (gl->gl_state == LM_ST_EXCLUSIVE) &&
242 (gh->gh_state == LM_ST_EXCLUSIVE)) {
243 spin_lock(&sdp->sd_trunc_lock);
244 if (list_empty(&ip->i_trunc_list))
245 list_add(&sdp->sd_trunc_list, &ip->i_trunc_list);
246 spin_unlock(&sdp->sd_trunc_lock);
247 wake_up(&sdp->sd_quota_wait);
255 * inode_go_dump - print information about an inode
259 * Returns: 0 on success, -ENOBUFS when we run out of space
262 static int inode_go_dump(struct seq_file *seq, const struct gfs2_glock *gl)
264 const struct gfs2_inode *ip = gl->gl_object;
267 gfs2_print_dbg(seq, " I: n:%llu/%llu t:%u f:0x%02lx d:0x%08x s:%llu/%llu\n",
268 (unsigned long long)ip->i_no_formal_ino,
269 (unsigned long long)ip->i_no_addr,
270 IF2DT(ip->i_inode.i_mode), ip->i_flags,
271 (unsigned int)ip->i_diskflags,
272 (unsigned long long)ip->i_inode.i_size,
273 (unsigned long long)ip->i_disksize);
278 * rgrp_go_demote_ok - Check to see if it's ok to unlock a RG's glock
281 * Returns: 1 if it's ok
284 static int rgrp_go_demote_ok(const struct gfs2_glock *gl)
286 return !gl->gl_aspace->i_mapping->nrpages;
290 * rgrp_go_lock - operation done after an rgrp lock is locked by
291 * a first holder on this node.
298 static int rgrp_go_lock(struct gfs2_holder *gh)
300 return gfs2_rgrp_bh_get(gh->gh_gl->gl_object);
304 * rgrp_go_unlock - operation done before an rgrp lock is unlocked by
305 * a last holder on this node.
311 static void rgrp_go_unlock(struct gfs2_holder *gh)
313 gfs2_rgrp_bh_put(gh->gh_gl->gl_object);
317 * rgrp_go_dump - print out an rgrp
319 * @gl: The glock in question
323 static int rgrp_go_dump(struct seq_file *seq, const struct gfs2_glock *gl)
325 const struct gfs2_rgrpd *rgd = gl->gl_object;
328 gfs2_print_dbg(seq, " R: n:%llu f:%02x b:%u/%u i:%u\n",
329 (unsigned long long)rgd->rd_addr, rgd->rd_flags,
330 rgd->rd_free, rgd->rd_free_clone, rgd->rd_dinodes);
335 * trans_go_sync - promote/demote the transaction glock
337 * @state: the requested state
342 static void trans_go_sync(struct gfs2_glock *gl)
344 struct gfs2_sbd *sdp = gl->gl_sbd;
346 if (gl->gl_state != LM_ST_UNLOCKED &&
347 test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
348 gfs2_meta_syncfs(sdp);
349 gfs2_log_shutdown(sdp);
354 * trans_go_xmote_bh - After promoting/demoting the transaction glock
359 static int trans_go_xmote_bh(struct gfs2_glock *gl, struct gfs2_holder *gh)
361 struct gfs2_sbd *sdp = gl->gl_sbd;
362 struct gfs2_inode *ip = GFS2_I(sdp->sd_jdesc->jd_inode);
363 struct gfs2_glock *j_gl = ip->i_gl;
364 struct gfs2_log_header_host head;
367 if (test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
368 j_gl->gl_ops->go_inval(j_gl, DIO_METADATA);
370 error = gfs2_find_jhead(sdp->sd_jdesc, &head);
373 if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT))
376 /* Initialize some head of the log stuff */
377 if (!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) {
378 sdp->sd_log_sequence = head.lh_sequence + 1;
379 gfs2_log_pointers_init(sdp, head.lh_blkno);
392 static int trans_go_demote_ok(const struct gfs2_glock *gl)
397 const struct gfs2_glock_operations gfs2_meta_glops = {
398 .go_xmote_th = meta_go_sync,
399 .go_type = LM_TYPE_META,
402 const struct gfs2_glock_operations gfs2_inode_glops = {
403 .go_xmote_th = inode_go_sync,
404 .go_inval = inode_go_inval,
405 .go_demote_ok = inode_go_demote_ok,
406 .go_lock = inode_go_lock,
407 .go_dump = inode_go_dump,
408 .go_type = LM_TYPE_INODE,
409 .go_min_hold_time = HZ / 5,
412 const struct gfs2_glock_operations gfs2_rgrp_glops = {
413 .go_xmote_th = meta_go_sync,
414 .go_inval = meta_go_inval,
415 .go_demote_ok = rgrp_go_demote_ok,
416 .go_lock = rgrp_go_lock,
417 .go_unlock = rgrp_go_unlock,
418 .go_dump = rgrp_go_dump,
419 .go_type = LM_TYPE_RGRP,
420 .go_min_hold_time = HZ / 5,
423 const struct gfs2_glock_operations gfs2_trans_glops = {
424 .go_xmote_th = trans_go_sync,
425 .go_xmote_bh = trans_go_xmote_bh,
426 .go_demote_ok = trans_go_demote_ok,
427 .go_type = LM_TYPE_NONDISK,
430 const struct gfs2_glock_operations gfs2_iopen_glops = {
431 .go_type = LM_TYPE_IOPEN,
434 const struct gfs2_glock_operations gfs2_flock_glops = {
435 .go_type = LM_TYPE_FLOCK,
438 const struct gfs2_glock_operations gfs2_nondisk_glops = {
439 .go_type = LM_TYPE_NONDISK,
442 const struct gfs2_glock_operations gfs2_quota_glops = {
443 .go_type = LM_TYPE_QUOTA,
446 const struct gfs2_glock_operations gfs2_journal_glops = {
447 .go_type = LM_TYPE_JOURNAL,
450 const struct gfs2_glock_operations *gfs2_glops_list[] = {
451 [LM_TYPE_META] = &gfs2_meta_glops,
452 [LM_TYPE_INODE] = &gfs2_inode_glops,
453 [LM_TYPE_RGRP] = &gfs2_rgrp_glops,
454 [LM_TYPE_NONDISK] = &gfs2_trans_glops,
455 [LM_TYPE_IOPEN] = &gfs2_iopen_glops,
456 [LM_TYPE_FLOCK] = &gfs2_flock_glops,
457 [LM_TYPE_NONDISK] = &gfs2_nondisk_glops,
458 [LM_TYPE_QUOTA] = &gfs2_quota_glops,
459 [LM_TYPE_JOURNAL] = &gfs2_journal_glops,