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;
41 struct list_head *head = &gl->gl_ail_list;
42 struct gfs2_bufdata *bd;
43 struct buffer_head *bh;
46 blocks = atomic_read(&gl->gl_ail_count);
50 error = gfs2_trans_begin(sdp, 0, blocks);
51 if (gfs2_assert_withdraw(sdp, !error))
55 while (!list_empty(head)) {
56 bd = list_entry(head->next, struct gfs2_bufdata,
59 gfs2_remove_from_ail(bd);
62 bd->bd_blkno = bh->b_blocknr;
63 gfs2_assert_withdraw(sdp, !buffer_busy(bh));
64 gfs2_trans_add_revoke(sdp, bd);
66 gfs2_assert_withdraw(sdp, !atomic_read(&gl->gl_ail_count));
70 gfs2_log_flush(sdp, NULL);
74 * gfs2_pte_inval - Sync and invalidate all PTEs associated with a glock
79 static void gfs2_pte_inval(struct gfs2_glock *gl)
81 struct gfs2_inode *ip;
86 if (!ip || !S_ISREG(inode->i_mode))
89 unmap_shared_mapping_range(inode->i_mapping, 0, 0);
90 if (test_bit(GIF_SW_PAGED, &ip->i_flags))
91 set_bit(GLF_DIRTY, &gl->gl_flags);
96 * meta_go_sync - sync out the metadata for this glock
99 * Called when demoting or unlocking an EX glock. We must flush
100 * to disk all dirty buffers/pages relating to this glock, and must not
101 * not return to caller to demote/unlock the glock until I/O is complete.
104 static void meta_go_sync(struct gfs2_glock *gl)
106 if (gl->gl_state != LM_ST_EXCLUSIVE)
109 if (test_and_clear_bit(GLF_DIRTY, &gl->gl_flags)) {
110 gfs2_log_flush(gl->gl_sbd, gl);
112 gfs2_ail_empty_gl(gl);
117 * meta_go_inval - invalidate the metadata for this glock
123 static void meta_go_inval(struct gfs2_glock *gl, int flags)
125 if (!(flags & DIO_METADATA))
129 if (gl->gl_object == GFS2_I(gl->gl_sbd->sd_rindex))
130 gl->gl_sbd->sd_rindex_uptodate = 0;
131 else if (gl->gl_ops == &gfs2_rgrp_glops && gl->gl_object) {
132 struct gfs2_rgrpd *rgd = (struct gfs2_rgrpd *)gl->gl_object;
134 rgd->rd_flags &= ~GFS2_RDF_UPTODATE;
139 * inode_go_sync - Sync the dirty data and/or metadata for an inode glock
140 * @gl: the glock protecting the inode
144 static void inode_go_sync(struct gfs2_glock *gl)
146 struct gfs2_inode *ip = gl->gl_object;
147 struct address_space *metamapping = gl->gl_aspace->i_mapping;
150 if (gl->gl_state != LM_ST_UNLOCKED)
152 if (gl->gl_state != LM_ST_EXCLUSIVE)
155 if (ip && !S_ISREG(ip->i_inode.i_mode))
158 if (test_bit(GLF_DIRTY, &gl->gl_flags)) {
159 gfs2_log_flush(gl->gl_sbd, gl);
160 filemap_fdatawrite(metamapping);
162 struct address_space *mapping = ip->i_inode.i_mapping;
163 filemap_fdatawrite(mapping);
164 error = filemap_fdatawait(mapping);
165 mapping_set_error(mapping, error);
167 error = filemap_fdatawait(metamapping);
168 mapping_set_error(metamapping, error);
169 clear_bit(GLF_DIRTY, &gl->gl_flags);
170 gfs2_ail_empty_gl(gl);
175 * inode_go_inval - prepare a inode glock to be released
181 static void inode_go_inval(struct gfs2_glock *gl, int flags)
183 struct gfs2_inode *ip = gl->gl_object;
184 int meta = (flags & DIO_METADATA);
189 set_bit(GIF_INVALID, &ip->i_flags);
192 if (ip && S_ISREG(ip->i_inode.i_mode))
193 truncate_inode_pages(ip->i_inode.i_mapping, 0);
197 * inode_go_demote_ok - Check to see if it's ok to unlock an inode glock
200 * Returns: 1 if it's ok
203 static int inode_go_demote_ok(const struct gfs2_glock *gl)
205 struct gfs2_sbd *sdp = gl->gl_sbd;
206 if (sdp->sd_jindex == gl->gl_object || sdp->sd_rindex == gl->gl_object)
212 * inode_go_lock - operation done after an inode lock is locked by a process
219 static int inode_go_lock(struct gfs2_holder *gh)
221 struct gfs2_glock *gl = gh->gh_gl;
222 struct gfs2_sbd *sdp = gl->gl_sbd;
223 struct gfs2_inode *ip = gl->gl_object;
226 if (!ip || (gh->gh_flags & GL_SKIP))
229 if (test_bit(GIF_INVALID, &ip->i_flags)) {
230 error = gfs2_inode_refresh(ip);
235 if ((ip->i_diskflags & GFS2_DIF_TRUNC_IN_PROG) &&
236 (gl->gl_state == LM_ST_EXCLUSIVE) &&
237 (gh->gh_state == LM_ST_EXCLUSIVE)) {
238 spin_lock(&sdp->sd_trunc_lock);
239 if (list_empty(&ip->i_trunc_list))
240 list_add(&sdp->sd_trunc_list, &ip->i_trunc_list);
241 spin_unlock(&sdp->sd_trunc_lock);
242 wake_up(&sdp->sd_quota_wait);
250 * inode_go_dump - print information about an inode
254 * Returns: 0 on success, -ENOBUFS when we run out of space
257 static int inode_go_dump(struct seq_file *seq, const struct gfs2_glock *gl)
259 const struct gfs2_inode *ip = gl->gl_object;
262 gfs2_print_dbg(seq, " I: n:%llu/%llu t:%u f:0x%02lx d:0x%08x s:%llu/%llu\n",
263 (unsigned long long)ip->i_no_formal_ino,
264 (unsigned long long)ip->i_no_addr,
265 IF2DT(ip->i_inode.i_mode), ip->i_flags,
266 (unsigned int)ip->i_diskflags,
267 (unsigned long long)ip->i_inode.i_size,
268 (unsigned long long)ip->i_disksize);
273 * rgrp_go_demote_ok - Check to see if it's ok to unlock a RG's glock
276 * Returns: 1 if it's ok
279 static int rgrp_go_demote_ok(const struct gfs2_glock *gl)
281 return !gl->gl_aspace->i_mapping->nrpages;
285 * rgrp_go_lock - operation done after an rgrp lock is locked by
286 * a first holder on this node.
293 static int rgrp_go_lock(struct gfs2_holder *gh)
295 return gfs2_rgrp_bh_get(gh->gh_gl->gl_object);
299 * rgrp_go_unlock - operation done before an rgrp lock is unlocked by
300 * a last holder on this node.
306 static void rgrp_go_unlock(struct gfs2_holder *gh)
308 gfs2_rgrp_bh_put(gh->gh_gl->gl_object);
312 * rgrp_go_dump - print out an rgrp
314 * @gl: The glock in question
318 static int rgrp_go_dump(struct seq_file *seq, const struct gfs2_glock *gl)
320 const struct gfs2_rgrpd *rgd = gl->gl_object;
323 gfs2_print_dbg(seq, " R: n:%llu f:%02x b:%u/%u i:%u\n",
324 (unsigned long long)rgd->rd_addr, rgd->rd_flags,
325 rgd->rd_free, rgd->rd_free_clone, rgd->rd_dinodes);
330 * trans_go_sync - promote/demote the transaction glock
332 * @state: the requested state
337 static void trans_go_sync(struct gfs2_glock *gl)
339 struct gfs2_sbd *sdp = gl->gl_sbd;
341 if (gl->gl_state != LM_ST_UNLOCKED &&
342 test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
343 gfs2_meta_syncfs(sdp);
344 gfs2_log_shutdown(sdp);
349 * trans_go_xmote_bh - After promoting/demoting the transaction glock
354 static int trans_go_xmote_bh(struct gfs2_glock *gl, struct gfs2_holder *gh)
356 struct gfs2_sbd *sdp = gl->gl_sbd;
357 struct gfs2_inode *ip = GFS2_I(sdp->sd_jdesc->jd_inode);
358 struct gfs2_glock *j_gl = ip->i_gl;
359 struct gfs2_log_header_host head;
362 if (test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
363 j_gl->gl_ops->go_inval(j_gl, DIO_METADATA);
365 error = gfs2_find_jhead(sdp->sd_jdesc, &head);
368 if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT))
371 /* Initialize some head of the log stuff */
372 if (!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) {
373 sdp->sd_log_sequence = head.lh_sequence + 1;
374 gfs2_log_pointers_init(sdp, head.lh_blkno);
387 static int trans_go_demote_ok(const struct gfs2_glock *gl)
392 const struct gfs2_glock_operations gfs2_meta_glops = {
393 .go_xmote_th = meta_go_sync,
394 .go_type = LM_TYPE_META,
397 const struct gfs2_glock_operations gfs2_inode_glops = {
398 .go_xmote_th = inode_go_sync,
399 .go_inval = inode_go_inval,
400 .go_demote_ok = inode_go_demote_ok,
401 .go_lock = inode_go_lock,
402 .go_dump = inode_go_dump,
403 .go_type = LM_TYPE_INODE,
404 .go_min_hold_time = HZ / 5,
407 const struct gfs2_glock_operations gfs2_rgrp_glops = {
408 .go_xmote_th = meta_go_sync,
409 .go_inval = meta_go_inval,
410 .go_demote_ok = rgrp_go_demote_ok,
411 .go_lock = rgrp_go_lock,
412 .go_unlock = rgrp_go_unlock,
413 .go_dump = rgrp_go_dump,
414 .go_type = LM_TYPE_RGRP,
415 .go_min_hold_time = HZ / 5,
418 const struct gfs2_glock_operations gfs2_trans_glops = {
419 .go_xmote_th = trans_go_sync,
420 .go_xmote_bh = trans_go_xmote_bh,
421 .go_demote_ok = trans_go_demote_ok,
422 .go_type = LM_TYPE_NONDISK,
425 const struct gfs2_glock_operations gfs2_iopen_glops = {
426 .go_type = LM_TYPE_IOPEN,
429 const struct gfs2_glock_operations gfs2_flock_glops = {
430 .go_type = LM_TYPE_FLOCK,
433 const struct gfs2_glock_operations gfs2_nondisk_glops = {
434 .go_type = LM_TYPE_NONDISK,
437 const struct gfs2_glock_operations gfs2_quota_glops = {
438 .go_type = LM_TYPE_QUOTA,
441 const struct gfs2_glock_operations gfs2_journal_glops = {
442 .go_type = LM_TYPE_JOURNAL,