2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
3 * Copyright (C) 2004-2006 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>
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))
133 * inode_go_sync - Sync the dirty data and/or metadata for an inode glock
134 * @gl: the glock protecting the inode
138 static void inode_go_sync(struct gfs2_glock *gl)
140 struct gfs2_inode *ip = gl->gl_object;
142 if (ip && !S_ISREG(ip->i_inode.i_mode))
145 if (test_bit(GLF_DIRTY, &gl->gl_flags)) {
146 if (ip && !gfs2_is_jdata(ip))
147 filemap_fdatawrite(ip->i_inode.i_mapping);
148 gfs2_log_flush(gl->gl_sbd, gl);
149 if (ip && gfs2_is_jdata(ip))
150 filemap_fdatawrite(ip->i_inode.i_mapping);
153 struct address_space *mapping = ip->i_inode.i_mapping;
154 int error = filemap_fdatawait(mapping);
155 mapping_set_error(mapping, error);
157 clear_bit(GLF_DIRTY, &gl->gl_flags);
158 gfs2_ail_empty_gl(gl);
163 * inode_go_xmote_th - promote/demote a glock
165 * @state: the requested state
170 static void inode_go_xmote_th(struct gfs2_glock *gl)
172 if (gl->gl_state != LM_ST_UNLOCKED)
174 if (gl->gl_state == LM_ST_EXCLUSIVE)
179 * inode_go_xmote_bh - After promoting/demoting a glock
184 static void inode_go_xmote_bh(struct gfs2_glock *gl)
186 struct gfs2_holder *gh = gl->gl_req_gh;
187 struct buffer_head *bh;
190 if (gl->gl_state != LM_ST_UNLOCKED &&
191 (!gh || !(gh->gh_flags & GL_SKIP))) {
192 error = gfs2_meta_read(gl, gl->gl_name.ln_number, 0, &bh);
199 * inode_go_drop_th - unlock a glock
202 * Invoked from rq_demote().
203 * Another node needs the lock in EXCLUSIVE mode, or lock (unused for too long)
204 * is being purged from our node's glock cache; we're dropping lock.
207 static void inode_go_drop_th(struct gfs2_glock *gl)
210 if (gl->gl_state == LM_ST_EXCLUSIVE)
215 * inode_go_inval - prepare a inode glock to be released
221 static void inode_go_inval(struct gfs2_glock *gl, int flags)
223 struct gfs2_inode *ip = gl->gl_object;
224 int meta = (flags & DIO_METADATA);
229 set_bit(GIF_INVALID, &ip->i_flags);
232 if (ip && S_ISREG(ip->i_inode.i_mode))
233 truncate_inode_pages(ip->i_inode.i_mapping, 0);
237 * inode_go_demote_ok - Check to see if it's ok to unlock an inode glock
240 * Returns: 1 if it's ok
243 static int inode_go_demote_ok(struct gfs2_glock *gl)
245 struct gfs2_sbd *sdp = gl->gl_sbd;
248 if (!gl->gl_object && !gl->gl_aspace->i_mapping->nrpages)
250 else if (!sdp->sd_args.ar_localcaching &&
251 time_after_eq(jiffies, gl->gl_stamp +
252 gfs2_tune_get(sdp, gt_demote_secs) * HZ))
259 * inode_go_lock - operation done after an inode lock is locked by a process
266 static int inode_go_lock(struct gfs2_holder *gh)
268 struct gfs2_glock *gl = gh->gh_gl;
269 struct gfs2_inode *ip = gl->gl_object;
275 if (test_bit(GIF_INVALID, &ip->i_flags)) {
276 error = gfs2_inode_refresh(ip);
281 if ((ip->i_di.di_flags & GFS2_DIF_TRUNC_IN_PROG) &&
282 (gl->gl_state == LM_ST_EXCLUSIVE) &&
283 (gh->gh_state == LM_ST_EXCLUSIVE))
284 error = gfs2_truncatei_resume(ip);
290 * rgrp_go_demote_ok - Check to see if it's ok to unlock a RG's glock
293 * Returns: 1 if it's ok
296 static int rgrp_go_demote_ok(struct gfs2_glock *gl)
298 return !gl->gl_aspace->i_mapping->nrpages;
302 * rgrp_go_lock - operation done after an rgrp lock is locked by
303 * a first holder on this node.
310 static int rgrp_go_lock(struct gfs2_holder *gh)
312 return gfs2_rgrp_bh_get(gh->gh_gl->gl_object);
316 * rgrp_go_unlock - operation done before an rgrp lock is unlocked by
317 * a last holder on this node.
323 static void rgrp_go_unlock(struct gfs2_holder *gh)
325 gfs2_rgrp_bh_put(gh->gh_gl->gl_object);
329 * trans_go_xmote_th - promote/demote the transaction glock
331 * @state: the requested state
336 static void trans_go_xmote_th(struct gfs2_glock *gl)
338 struct gfs2_sbd *sdp = gl->gl_sbd;
340 if (gl->gl_state != LM_ST_UNLOCKED &&
341 test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
342 gfs2_meta_syncfs(sdp);
343 gfs2_log_shutdown(sdp);
348 * trans_go_xmote_bh - After promoting/demoting the transaction glock
353 static void trans_go_xmote_bh(struct gfs2_glock *gl)
355 struct gfs2_sbd *sdp = gl->gl_sbd;
356 struct gfs2_inode *ip = GFS2_I(sdp->sd_jdesc->jd_inode);
357 struct gfs2_glock *j_gl = ip->i_gl;
358 struct gfs2_log_header_host head;
361 if (gl->gl_state != LM_ST_UNLOCKED &&
362 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);
380 * trans_go_drop_th - unlock the transaction glock
383 * We want to sync the device even with localcaching. Remember
384 * that localcaching journal replay only marks buffers dirty.
387 static void trans_go_drop_th(struct gfs2_glock *gl)
389 struct gfs2_sbd *sdp = gl->gl_sbd;
391 if (test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
392 gfs2_meta_syncfs(sdp);
393 gfs2_log_shutdown(sdp);
398 * quota_go_demote_ok - Check to see if it's ok to unlock a quota glock
401 * Returns: 1 if it's ok
404 static int quota_go_demote_ok(struct gfs2_glock *gl)
406 return !atomic_read(&gl->gl_lvb_count);
409 const struct gfs2_glock_operations gfs2_meta_glops = {
410 .go_xmote_th = meta_go_sync,
411 .go_drop_th = meta_go_sync,
412 .go_type = LM_TYPE_META,
415 const struct gfs2_glock_operations gfs2_inode_glops = {
416 .go_xmote_th = inode_go_xmote_th,
417 .go_xmote_bh = inode_go_xmote_bh,
418 .go_drop_th = inode_go_drop_th,
419 .go_inval = inode_go_inval,
420 .go_demote_ok = inode_go_demote_ok,
421 .go_lock = inode_go_lock,
422 .go_type = LM_TYPE_INODE,
423 .go_min_hold_time = HZ / 10,
426 const struct gfs2_glock_operations gfs2_rgrp_glops = {
427 .go_xmote_th = meta_go_sync,
428 .go_drop_th = meta_go_sync,
429 .go_inval = meta_go_inval,
430 .go_demote_ok = rgrp_go_demote_ok,
431 .go_lock = rgrp_go_lock,
432 .go_unlock = rgrp_go_unlock,
433 .go_type = LM_TYPE_RGRP,
434 .go_min_hold_time = HZ / 10,
437 const struct gfs2_glock_operations gfs2_trans_glops = {
438 .go_xmote_th = trans_go_xmote_th,
439 .go_xmote_bh = trans_go_xmote_bh,
440 .go_drop_th = trans_go_drop_th,
441 .go_type = LM_TYPE_NONDISK,
444 const struct gfs2_glock_operations gfs2_iopen_glops = {
445 .go_type = LM_TYPE_IOPEN,
448 const struct gfs2_glock_operations gfs2_flock_glops = {
449 .go_type = LM_TYPE_FLOCK,
452 const struct gfs2_glock_operations gfs2_nondisk_glops = {
453 .go_type = LM_TYPE_NONDISK,
456 const struct gfs2_glock_operations gfs2_quota_glops = {
457 .go_demote_ok = quota_go_demote_ok,
458 .go_type = LM_TYPE_QUOTA,
461 const struct gfs2_glock_operations gfs2_journal_glops = {
462 .go_type = LM_TYPE_JOURNAL,