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 * rgrp_go_sync - sync out the metadata for this glock
82 * Called when demoting or unlocking an EX glock. We must flush
83 * to disk all dirty buffers/pages relating to this glock, and must not
84 * not return to caller to demote/unlock the glock until I/O is complete.
87 static void rgrp_go_sync(struct gfs2_glock *gl)
89 struct address_space *metamapping = gl->gl_aspace->i_mapping;
92 if (!test_and_clear_bit(GLF_DIRTY, &gl->gl_flags))
94 BUG_ON(gl->gl_state != LM_ST_EXCLUSIVE);
96 gfs2_log_flush(gl->gl_sbd, gl);
97 filemap_fdatawrite(metamapping);
98 error = filemap_fdatawait(metamapping);
99 mapping_set_error(metamapping, error);
100 gfs2_ail_empty_gl(gl);
104 * rgrp_go_inval - invalidate the metadata for this glock
108 * We never used LM_ST_DEFERRED with resource groups, so that we
109 * should always see the metadata flag set here.
113 static void rgrp_go_inval(struct gfs2_glock *gl, int flags)
115 struct address_space *mapping = gl->gl_aspace->i_mapping;
117 BUG_ON(!(flags & DIO_METADATA));
118 gfs2_assert_withdraw(gl->gl_sbd, !atomic_read(&gl->gl_ail_count));
119 truncate_inode_pages(mapping, 0);
122 struct gfs2_rgrpd *rgd = (struct gfs2_rgrpd *)gl->gl_object;
123 rgd->rd_flags &= ~GFS2_RDF_UPTODATE;
128 * inode_go_sync - Sync the dirty data and/or metadata for an inode glock
129 * @gl: the glock protecting the inode
133 static void inode_go_sync(struct gfs2_glock *gl)
135 struct gfs2_inode *ip = gl->gl_object;
136 struct address_space *metamapping = gl->gl_aspace->i_mapping;
139 if (ip && !S_ISREG(ip->i_inode.i_mode))
141 if (ip && test_and_clear_bit(GIF_SW_PAGED, &ip->i_flags))
142 unmap_shared_mapping_range(ip->i_inode.i_mapping, 0, 0);
143 if (!test_and_clear_bit(GLF_DIRTY, &gl->gl_flags))
146 BUG_ON(gl->gl_state != LM_ST_EXCLUSIVE);
148 gfs2_log_flush(gl->gl_sbd, gl);
149 filemap_fdatawrite(metamapping);
151 struct address_space *mapping = ip->i_inode.i_mapping;
152 filemap_fdatawrite(mapping);
153 error = filemap_fdatawait(mapping);
154 mapping_set_error(mapping, error);
156 error = filemap_fdatawait(metamapping);
157 mapping_set_error(metamapping, error);
158 gfs2_ail_empty_gl(gl);
160 * Writeback of the data mapping may cause the dirty flag to be set
161 * so we have to clear it again here.
163 smp_mb__before_clear_bit();
164 clear_bit(GLF_DIRTY, &gl->gl_flags);
168 * inode_go_inval - prepare a inode glock to be released
172 * Normally we invlidate everything, but if we are moving into
173 * LM_ST_DEFERRED from LM_ST_SHARED or LM_ST_EXCLUSIVE then we
174 * can keep hold of the metadata, since it won't have changed.
178 static void inode_go_inval(struct gfs2_glock *gl, int flags)
180 struct gfs2_inode *ip = gl->gl_object;
182 gfs2_assert_withdraw(gl->gl_sbd, !atomic_read(&gl->gl_ail_count));
184 if (flags & DIO_METADATA) {
185 struct address_space *mapping = gl->gl_aspace->i_mapping;
186 truncate_inode_pages(mapping, 0);
188 set_bit(GIF_INVALID, &ip->i_flags);
191 if (ip == GFS2_I(gl->gl_sbd->sd_rindex))
192 gl->gl_sbd->sd_rindex_uptodate = 0;
193 if (ip && S_ISREG(ip->i_inode.i_mode))
194 truncate_inode_pages(ip->i_inode.i_mapping, 0);
198 * inode_go_demote_ok - Check to see if it's ok to unlock an inode glock
201 * Returns: 1 if it's ok
204 static int inode_go_demote_ok(const struct gfs2_glock *gl)
206 struct gfs2_sbd *sdp = gl->gl_sbd;
207 if (sdp->sd_jindex == gl->gl_object || sdp->sd_rindex == gl->gl_object)
213 * inode_go_lock - operation done after an inode lock is locked by a process
220 static int inode_go_lock(struct gfs2_holder *gh)
222 struct gfs2_glock *gl = gh->gh_gl;
223 struct gfs2_sbd *sdp = gl->gl_sbd;
224 struct gfs2_inode *ip = gl->gl_object;
227 if (!ip || (gh->gh_flags & GL_SKIP))
230 if (test_bit(GIF_INVALID, &ip->i_flags)) {
231 error = gfs2_inode_refresh(ip);
236 if ((ip->i_diskflags & GFS2_DIF_TRUNC_IN_PROG) &&
237 (gl->gl_state == LM_ST_EXCLUSIVE) &&
238 (gh->gh_state == LM_ST_EXCLUSIVE)) {
239 spin_lock(&sdp->sd_trunc_lock);
240 if (list_empty(&ip->i_trunc_list))
241 list_add(&sdp->sd_trunc_list, &ip->i_trunc_list);
242 spin_unlock(&sdp->sd_trunc_lock);
243 wake_up(&sdp->sd_quota_wait);
251 * inode_go_dump - print information about an inode
255 * Returns: 0 on success, -ENOBUFS when we run out of space
258 static int inode_go_dump(struct seq_file *seq, const struct gfs2_glock *gl)
260 const struct gfs2_inode *ip = gl->gl_object;
263 gfs2_print_dbg(seq, " I: n:%llu/%llu t:%u f:0x%02lx d:0x%08x s:%llu/%llu\n",
264 (unsigned long long)ip->i_no_formal_ino,
265 (unsigned long long)ip->i_no_addr,
266 IF2DT(ip->i_inode.i_mode), ip->i_flags,
267 (unsigned int)ip->i_diskflags,
268 (unsigned long long)ip->i_inode.i_size,
269 (unsigned long long)ip->i_disksize);
274 * rgrp_go_demote_ok - Check to see if it's ok to unlock a RG's glock
277 * Returns: 1 if it's ok
280 static int rgrp_go_demote_ok(const struct gfs2_glock *gl)
282 return !gl->gl_aspace->i_mapping->nrpages;
286 * rgrp_go_lock - operation done after an rgrp lock is locked by
287 * a first holder on this node.
294 static int rgrp_go_lock(struct gfs2_holder *gh)
296 return gfs2_rgrp_bh_get(gh->gh_gl->gl_object);
300 * rgrp_go_unlock - operation done before an rgrp lock is unlocked by
301 * a last holder on this node.
307 static void rgrp_go_unlock(struct gfs2_holder *gh)
309 gfs2_rgrp_bh_put(gh->gh_gl->gl_object);
313 * trans_go_sync - promote/demote the transaction glock
315 * @state: the requested state
320 static void trans_go_sync(struct gfs2_glock *gl)
322 struct gfs2_sbd *sdp = gl->gl_sbd;
324 if (gl->gl_state != LM_ST_UNLOCKED &&
325 test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
326 gfs2_meta_syncfs(sdp);
327 gfs2_log_shutdown(sdp);
332 * trans_go_xmote_bh - After promoting/demoting the transaction glock
337 static int trans_go_xmote_bh(struct gfs2_glock *gl, struct gfs2_holder *gh)
339 struct gfs2_sbd *sdp = gl->gl_sbd;
340 struct gfs2_inode *ip = GFS2_I(sdp->sd_jdesc->jd_inode);
341 struct gfs2_glock *j_gl = ip->i_gl;
342 struct gfs2_log_header_host head;
345 if (test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
346 j_gl->gl_ops->go_inval(j_gl, DIO_METADATA);
348 error = gfs2_find_jhead(sdp->sd_jdesc, &head);
351 if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT))
354 /* Initialize some head of the log stuff */
355 if (!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) {
356 sdp->sd_log_sequence = head.lh_sequence + 1;
357 gfs2_log_pointers_init(sdp, head.lh_blkno);
370 static int trans_go_demote_ok(const struct gfs2_glock *gl)
375 const struct gfs2_glock_operations gfs2_meta_glops = {
376 .go_type = LM_TYPE_META,
379 const struct gfs2_glock_operations gfs2_inode_glops = {
380 .go_xmote_th = inode_go_sync,
381 .go_inval = inode_go_inval,
382 .go_demote_ok = inode_go_demote_ok,
383 .go_lock = inode_go_lock,
384 .go_dump = inode_go_dump,
385 .go_type = LM_TYPE_INODE,
386 .go_min_hold_time = HZ / 5,
389 const struct gfs2_glock_operations gfs2_rgrp_glops = {
390 .go_xmote_th = rgrp_go_sync,
391 .go_inval = rgrp_go_inval,
392 .go_demote_ok = rgrp_go_demote_ok,
393 .go_lock = rgrp_go_lock,
394 .go_unlock = rgrp_go_unlock,
395 .go_dump = gfs2_rgrp_dump,
396 .go_type = LM_TYPE_RGRP,
397 .go_min_hold_time = HZ / 5,
400 const struct gfs2_glock_operations gfs2_trans_glops = {
401 .go_xmote_th = trans_go_sync,
402 .go_xmote_bh = trans_go_xmote_bh,
403 .go_demote_ok = trans_go_demote_ok,
404 .go_type = LM_TYPE_NONDISK,
407 const struct gfs2_glock_operations gfs2_iopen_glops = {
408 .go_type = LM_TYPE_IOPEN,
411 const struct gfs2_glock_operations gfs2_flock_glops = {
412 .go_type = LM_TYPE_FLOCK,
415 const struct gfs2_glock_operations gfs2_nondisk_glops = {
416 .go_type = LM_TYPE_NONDISK,
419 const struct gfs2_glock_operations gfs2_quota_glops = {
420 .go_type = LM_TYPE_QUOTA,
423 const struct gfs2_glock_operations gfs2_journal_glops = {
424 .go_type = LM_TYPE_JOURNAL,
427 const struct gfs2_glock_operations *gfs2_glops_list[] = {
428 [LM_TYPE_META] = &gfs2_meta_glops,
429 [LM_TYPE_INODE] = &gfs2_inode_glops,
430 [LM_TYPE_RGRP] = &gfs2_rgrp_glops,
431 [LM_TYPE_NONDISK] = &gfs2_trans_glops,
432 [LM_TYPE_IOPEN] = &gfs2_iopen_glops,
433 [LM_TYPE_FLOCK] = &gfs2_flock_glops,
434 [LM_TYPE_NONDISK] = &gfs2_nondisk_glops,
435 [LM_TYPE_QUOTA] = &gfs2_quota_glops,
436 [LM_TYPE_JOURNAL] = &gfs2_journal_glops,