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/lm_interface.h>
16 #include <linux/bio.h>
32 * ail_empty_gl - remove all buffers for a given lock from the AIL
35 * None of the buffers should be dirty, locked, or pinned.
38 static void gfs2_ail_empty_gl(struct gfs2_glock *gl)
40 struct gfs2_sbd *sdp = gl->gl_sbd;
42 struct list_head *head = &gl->gl_ail_list;
43 struct gfs2_bufdata *bd;
44 struct buffer_head *bh;
47 blocks = atomic_read(&gl->gl_ail_count);
51 error = gfs2_trans_begin(sdp, 0, blocks);
52 if (gfs2_assert_withdraw(sdp, !error))
56 while (!list_empty(head)) {
57 bd = list_entry(head->next, struct gfs2_bufdata,
60 gfs2_remove_from_ail(bd);
63 bd->bd_blkno = bh->b_blocknr;
64 gfs2_assert_withdraw(sdp, !buffer_busy(bh));
65 gfs2_trans_add_revoke(sdp, bd);
67 gfs2_assert_withdraw(sdp, !atomic_read(&gl->gl_ail_count));
71 gfs2_log_flush(sdp, NULL);
75 * gfs2_pte_inval - Sync and invalidate all PTEs associated with a glock
80 static void gfs2_pte_inval(struct gfs2_glock *gl)
82 struct gfs2_inode *ip;
87 if (!ip || !S_ISREG(inode->i_mode))
90 unmap_shared_mapping_range(inode->i_mapping, 0, 0);
91 if (test_bit(GIF_SW_PAGED, &ip->i_flags))
92 set_bit(GLF_DIRTY, &gl->gl_flags);
97 * meta_go_sync - sync out the metadata for this glock
100 * Called when demoting or unlocking an EX glock. We must flush
101 * to disk all dirty buffers/pages relating to this glock, and must not
102 * not return to caller to demote/unlock the glock until I/O is complete.
105 static void meta_go_sync(struct gfs2_glock *gl)
107 if (gl->gl_state != LM_ST_EXCLUSIVE)
110 if (test_and_clear_bit(GLF_DIRTY, &gl->gl_flags)) {
111 gfs2_log_flush(gl->gl_sbd, gl);
113 gfs2_ail_empty_gl(gl);
118 * meta_go_inval - invalidate the metadata for this glock
124 static void meta_go_inval(struct gfs2_glock *gl, int flags)
126 if (!(flags & DIO_METADATA))
130 if (gl->gl_object == GFS2_I(gl->gl_sbd->sd_rindex))
131 gl->gl_sbd->sd_rindex_uptodate = 0;
132 else if (gl->gl_ops == &gfs2_rgrp_glops && gl->gl_object) {
133 struct gfs2_rgrpd *rgd = (struct gfs2_rgrpd *)gl->gl_object;
135 rgd->rd_flags &= ~GFS2_RDF_UPTODATE;
140 * inode_go_sync - Sync the dirty data and/or metadata for an inode glock
141 * @gl: the glock protecting the inode
145 static void inode_go_sync(struct gfs2_glock *gl)
147 struct gfs2_inode *ip = gl->gl_object;
148 struct address_space *metamapping = gl->gl_aspace->i_mapping;
151 if (gl->gl_state != LM_ST_UNLOCKED)
153 if (gl->gl_state != LM_ST_EXCLUSIVE)
156 if (ip && !S_ISREG(ip->i_inode.i_mode))
159 if (test_bit(GLF_DIRTY, &gl->gl_flags)) {
160 gfs2_log_flush(gl->gl_sbd, gl);
161 filemap_fdatawrite(metamapping);
163 struct address_space *mapping = ip->i_inode.i_mapping;
164 filemap_fdatawrite(mapping);
165 error = filemap_fdatawait(mapping);
166 mapping_set_error(mapping, error);
168 error = filemap_fdatawait(metamapping);
169 mapping_set_error(metamapping, error);
170 clear_bit(GLF_DIRTY, &gl->gl_flags);
171 gfs2_ail_empty_gl(gl);
176 * inode_go_inval - prepare a inode glock to be released
182 static void inode_go_inval(struct gfs2_glock *gl, int flags)
184 struct gfs2_inode *ip = gl->gl_object;
185 int meta = (flags & DIO_METADATA);
190 set_bit(GIF_INVALID, &ip->i_flags);
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(struct gfs2_glock *gl)
206 struct gfs2_sbd *sdp = gl->gl_sbd;
209 if (!gl->gl_object && !gl->gl_aspace->i_mapping->nrpages)
211 else if (!sdp->sd_args.ar_localcaching &&
212 time_after_eq(jiffies, gl->gl_stamp +
213 gfs2_tune_get(sdp, gt_demote_secs) * HZ))
220 * inode_go_lock - operation done after an inode lock is locked by a process
227 static int inode_go_lock(struct gfs2_holder *gh)
229 struct gfs2_glock *gl = gh->gh_gl;
230 struct gfs2_sbd *sdp = gl->gl_sbd;
231 struct gfs2_inode *ip = gl->gl_object;
234 if (!ip || (gh->gh_flags & GL_SKIP))
237 if (test_bit(GIF_INVALID, &ip->i_flags)) {
238 error = gfs2_inode_refresh(ip);
243 if ((ip->i_diskflags & GFS2_DIF_TRUNC_IN_PROG) &&
244 (gl->gl_state == LM_ST_EXCLUSIVE) &&
245 (gh->gh_state == LM_ST_EXCLUSIVE)) {
246 spin_lock(&sdp->sd_trunc_lock);
247 if (list_empty(&ip->i_trunc_list))
248 list_add(&sdp->sd_trunc_list, &ip->i_trunc_list);
249 spin_unlock(&sdp->sd_trunc_lock);
250 wake_up(&sdp->sd_quota_wait);
258 * inode_go_dump - print information about an inode
262 * Returns: 0 on success, -ENOBUFS when we run out of space
265 static int inode_go_dump(struct seq_file *seq, const struct gfs2_glock *gl)
267 const struct gfs2_inode *ip = gl->gl_object;
270 gfs2_print_dbg(seq, " I: n:%llu/%llu t:%u f:0x%02lx d:0x%08x s:%llu/%llu\n",
271 (unsigned long long)ip->i_no_formal_ino,
272 (unsigned long long)ip->i_no_addr,
273 IF2DT(ip->i_inode.i_mode), ip->i_flags,
274 (unsigned int)ip->i_diskflags,
275 (unsigned long long)ip->i_inode.i_size,
276 (unsigned long long)ip->i_disksize);
281 * rgrp_go_demote_ok - Check to see if it's ok to unlock a RG's glock
284 * Returns: 1 if it's ok
287 static int rgrp_go_demote_ok(struct gfs2_glock *gl)
289 return !gl->gl_aspace->i_mapping->nrpages;
293 * rgrp_go_lock - operation done after an rgrp lock is locked by
294 * a first holder on this node.
301 static int rgrp_go_lock(struct gfs2_holder *gh)
303 return gfs2_rgrp_bh_get(gh->gh_gl->gl_object);
307 * rgrp_go_unlock - operation done before an rgrp lock is unlocked by
308 * a last holder on this node.
314 static void rgrp_go_unlock(struct gfs2_holder *gh)
316 gfs2_rgrp_bh_put(gh->gh_gl->gl_object);
320 * rgrp_go_dump - print out an rgrp
322 * @gl: The glock in question
326 static int rgrp_go_dump(struct seq_file *seq, const struct gfs2_glock *gl)
328 const struct gfs2_rgrpd *rgd = gl->gl_object;
331 gfs2_print_dbg(seq, " R: n:%llu f:%02x b:%u/%u i:%u\n",
332 (unsigned long long)rgd->rd_addr, rgd->rd_flags,
333 rgd->rd_free, rgd->rd_free_clone, rgd->rd_dinodes);
338 * trans_go_sync - promote/demote the transaction glock
340 * @state: the requested state
345 static void trans_go_sync(struct gfs2_glock *gl)
347 struct gfs2_sbd *sdp = gl->gl_sbd;
349 if (gl->gl_state != LM_ST_UNLOCKED &&
350 test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
351 gfs2_meta_syncfs(sdp);
352 gfs2_log_shutdown(sdp);
357 * trans_go_xmote_bh - After promoting/demoting the transaction glock
362 static int trans_go_xmote_bh(struct gfs2_glock *gl, struct gfs2_holder *gh)
364 struct gfs2_sbd *sdp = gl->gl_sbd;
365 struct gfs2_inode *ip = GFS2_I(sdp->sd_jdesc->jd_inode);
366 struct gfs2_glock *j_gl = ip->i_gl;
367 struct gfs2_log_header_host head;
370 if (test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
371 j_gl->gl_ops->go_inval(j_gl, DIO_METADATA);
373 error = gfs2_find_jhead(sdp->sd_jdesc, &head);
376 if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT))
379 /* Initialize some head of the log stuff */
380 if (!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) {
381 sdp->sd_log_sequence = head.lh_sequence + 1;
382 gfs2_log_pointers_init(sdp, head.lh_blkno);
389 * quota_go_demote_ok - Check to see if it's ok to unlock a quota glock
392 * Returns: 1 if it's ok
395 static int quota_go_demote_ok(struct gfs2_glock *gl)
397 return !atomic_read(&gl->gl_lvb_count);
400 const struct gfs2_glock_operations gfs2_meta_glops = {
401 .go_xmote_th = meta_go_sync,
402 .go_type = LM_TYPE_META,
405 const struct gfs2_glock_operations gfs2_inode_glops = {
406 .go_xmote_th = inode_go_sync,
407 .go_inval = inode_go_inval,
408 .go_demote_ok = inode_go_demote_ok,
409 .go_lock = inode_go_lock,
410 .go_dump = inode_go_dump,
411 .go_type = LM_TYPE_INODE,
412 .go_min_hold_time = HZ / 5,
415 const struct gfs2_glock_operations gfs2_rgrp_glops = {
416 .go_xmote_th = meta_go_sync,
417 .go_inval = meta_go_inval,
418 .go_demote_ok = rgrp_go_demote_ok,
419 .go_lock = rgrp_go_lock,
420 .go_unlock = rgrp_go_unlock,
421 .go_dump = rgrp_go_dump,
422 .go_type = LM_TYPE_RGRP,
423 .go_min_hold_time = HZ / 5,
426 const struct gfs2_glock_operations gfs2_trans_glops = {
427 .go_xmote_th = trans_go_sync,
428 .go_xmote_bh = trans_go_xmote_bh,
429 .go_type = LM_TYPE_NONDISK,
432 const struct gfs2_glock_operations gfs2_iopen_glops = {
433 .go_type = LM_TYPE_IOPEN,
436 const struct gfs2_glock_operations gfs2_flock_glops = {
437 .go_type = LM_TYPE_FLOCK,
440 const struct gfs2_glock_operations gfs2_nondisk_glops = {
441 .go_type = LM_TYPE_NONDISK,
444 const struct gfs2_glock_operations gfs2_quota_glops = {
445 .go_demote_ok = quota_go_demote_ok,
446 .go_type = LM_TYPE_QUOTA,
449 const struct gfs2_glock_operations gfs2_journal_glops = {
450 .go_type = LM_TYPE_JOURNAL,