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 v.2.
10 #include <linux/sched.h>
11 #include <linux/slab.h>
12 #include <linux/spinlock.h>
13 #include <linux/completion.h>
14 #include <linux/buffer_head.h>
15 #include <linux/gfs2_ondisk.h>
18 #include "lm_interface.h"
32 * meta_go_sync - sync out the metadata for this glock
36 * Called when demoting or unlocking an EX glock. We must flush
37 * to disk all dirty buffers/pages relating to this glock, and must not
38 * not return to caller to demote/unlock the glock until I/O is complete.
41 static void meta_go_sync(struct gfs2_glock *gl, int flags)
43 if (!(flags & DIO_METADATA))
46 if (test_and_clear_bit(GLF_DIRTY, &gl->gl_flags)) {
47 gfs2_log_flush(gl->gl_sbd, gl);
48 gfs2_meta_sync(gl, flags | DIO_START | DIO_WAIT);
49 if (flags & DIO_RELEASE)
50 gfs2_ail_empty_gl(gl);
53 clear_bit(GLF_SYNC, &gl->gl_flags);
57 * meta_go_inval - invalidate the metadata for this glock
63 static void meta_go_inval(struct gfs2_glock *gl, int flags)
65 if (!(flags & DIO_METADATA))
73 * meta_go_demote_ok - Check to see if it's ok to unlock a glock
76 * Returns: 1 if we have no cached data; ok to demote meta glock
79 static int meta_go_demote_ok(struct gfs2_glock *gl)
81 return !gl->gl_aspace->i_mapping->nrpages;
85 * inode_go_xmote_th - promote/demote a glock
87 * @state: the requested state
92 static void inode_go_xmote_th(struct gfs2_glock *gl, unsigned int state,
95 if (gl->gl_state != LM_ST_UNLOCKED)
97 gfs2_glock_xmote_th(gl, state, flags);
101 * inode_go_xmote_bh - After promoting/demoting a glock
106 static void inode_go_xmote_bh(struct gfs2_glock *gl)
108 struct gfs2_holder *gh = gl->gl_req_gh;
109 struct buffer_head *bh;
112 if (gl->gl_state != LM_ST_UNLOCKED &&
113 (!gh || !(gh->gh_flags & GL_SKIP))) {
114 error = gfs2_meta_read(gl, gl->gl_name.ln_number, DIO_START,
122 * inode_go_drop_th - unlock a glock
125 * Invoked from rq_demote().
126 * Another node needs the lock in EXCLUSIVE mode, or lock (unused for too long)
127 * is being purged from our node's glock cache; we're dropping lock.
130 static void inode_go_drop_th(struct gfs2_glock *gl)
133 gfs2_glock_drop_th(gl);
137 * inode_go_sync - Sync the dirty data and/or metadata for an inode glock
138 * @gl: the glock protecting the inode
143 static void inode_go_sync(struct gfs2_glock *gl, int flags)
145 int meta = (flags & DIO_METADATA);
146 int data = (flags & DIO_DATA);
148 if (test_bit(GLF_DIRTY, &gl->gl_flags)) {
150 gfs2_page_sync(gl, flags | DIO_START);
151 gfs2_log_flush(gl->gl_sbd, gl);
152 gfs2_meta_sync(gl, flags | DIO_START | DIO_WAIT);
153 gfs2_page_sync(gl, flags | DIO_WAIT);
154 clear_bit(GLF_DIRTY, &gl->gl_flags);
156 gfs2_log_flush(gl->gl_sbd, gl);
157 gfs2_meta_sync(gl, flags | DIO_START | DIO_WAIT);
159 gfs2_page_sync(gl, flags | DIO_START | DIO_WAIT);
160 if (flags & DIO_RELEASE)
161 gfs2_ail_empty_gl(gl);
164 clear_bit(GLF_SYNC, &gl->gl_flags);
168 * inode_go_inval - prepare a inode glock to be released
174 static void inode_go_inval(struct gfs2_glock *gl, int flags)
176 int meta = (flags & DIO_METADATA);
177 int data = (flags & DIO_DATA);
188 * inode_go_demote_ok - Check to see if it's ok to unlock an inode glock
191 * Returns: 1 if it's ok
194 static int inode_go_demote_ok(struct gfs2_glock *gl)
196 struct gfs2_sbd *sdp = gl->gl_sbd;
199 if (!gl->gl_object && !gl->gl_aspace->i_mapping->nrpages)
201 else if (!sdp->sd_args.ar_localcaching &&
202 time_after_eq(jiffies, gl->gl_stamp +
203 gfs2_tune_get(sdp, gt_demote_secs) * HZ))
210 * inode_go_lock - operation done after an inode lock is locked by a process
217 static int inode_go_lock(struct gfs2_holder *gh)
219 struct gfs2_glock *gl = gh->gh_gl;
220 struct gfs2_inode *ip = gl->gl_object;
226 if (ip->i_vn != gl->gl_vn) {
227 error = gfs2_inode_refresh(ip);
230 gfs2_inode_attr_in(ip);
233 if ((ip->i_di.di_flags & GFS2_DIF_TRUNC_IN_PROG) &&
234 (gl->gl_state == LM_ST_EXCLUSIVE) &&
235 (gh->gh_flags & GL_LOCAL_EXCL))
236 error = gfs2_truncatei_resume(ip);
242 * inode_go_unlock - operation done before an inode lock is unlocked by a
249 static void inode_go_unlock(struct gfs2_holder *gh)
251 struct gfs2_glock *gl = gh->gh_gl;
252 struct gfs2_inode *ip = gl->gl_object;
254 if (ip && test_bit(GLF_DIRTY, &gl->gl_flags))
255 gfs2_inode_attr_in(ip);
258 gfs2_meta_cache_flush(ip);
267 static void inode_greedy(struct gfs2_glock *gl)
269 struct gfs2_sbd *sdp = gl->gl_sbd;
270 struct gfs2_inode *ip = gl->gl_object;
271 unsigned int quantum = gfs2_tune_get(sdp, gt_greedy_quantum);
272 unsigned int max = gfs2_tune_get(sdp, gt_greedy_max);
273 unsigned int new_time;
275 spin_lock(&ip->i_spin);
277 if (time_after(ip->i_last_pfault + quantum, jiffies)) {
278 new_time = ip->i_greedy + quantum;
282 new_time = ip->i_greedy - quantum;
283 if (!new_time || new_time > max)
287 ip->i_greedy = new_time;
289 spin_unlock(&ip->i_spin);
295 * rgrp_go_demote_ok - Check to see if it's ok to unlock a RG's glock
298 * Returns: 1 if it's ok
301 static int rgrp_go_demote_ok(struct gfs2_glock *gl)
303 return !gl->gl_aspace->i_mapping->nrpages;
307 * rgrp_go_lock - operation done after an rgrp lock is locked by
308 * a first holder on this node.
315 static int rgrp_go_lock(struct gfs2_holder *gh)
317 return gfs2_rgrp_bh_get(gh->gh_gl->gl_object);
321 * rgrp_go_unlock - operation done before an rgrp lock is unlocked by
322 * a last holder on this node.
328 static void rgrp_go_unlock(struct gfs2_holder *gh)
330 gfs2_rgrp_bh_put(gh->gh_gl->gl_object);
334 * trans_go_xmote_th - promote/demote the transaction glock
336 * @state: the requested state
341 static void trans_go_xmote_th(struct gfs2_glock *gl, unsigned int state,
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);
352 gfs2_glock_xmote_th(gl, state, flags);
356 * trans_go_xmote_bh - After promoting/demoting the transaction glock
361 static void trans_go_xmote_bh(struct gfs2_glock *gl)
363 struct gfs2_sbd *sdp = gl->gl_sbd;
364 struct gfs2_inode *ip = GFS2_I(sdp->sd_jdesc->jd_inode);
365 struct gfs2_glock *j_gl = ip->i_gl;
366 struct gfs2_log_header head;
369 if (gl->gl_state != LM_ST_UNLOCKED &&
370 test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
371 gfs2_meta_cache_flush(GFS2_I(sdp->sd_jdesc->jd_inode));
372 j_gl->gl_ops->go_inval(j_gl, DIO_METADATA | DIO_DATA);
374 error = gfs2_find_jhead(sdp->sd_jdesc, &head);
377 if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT))
380 /* Initialize some head of the log stuff */
381 if (!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) {
382 sdp->sd_log_sequence = head.lh_sequence + 1;
383 gfs2_log_pointers_init(sdp, head.lh_blkno);
389 * trans_go_drop_th - unlock the transaction glock
392 * We want to sync the device even with localcaching. Remember
393 * that localcaching journal replay only marks buffers dirty.
396 static void trans_go_drop_th(struct gfs2_glock *gl)
398 struct gfs2_sbd *sdp = gl->gl_sbd;
400 if (test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
401 gfs2_meta_syncfs(sdp);
402 gfs2_log_shutdown(sdp);
405 gfs2_glock_drop_th(gl);
409 * quota_go_demote_ok - Check to see if it's ok to unlock a quota glock
412 * Returns: 1 if it's ok
415 static int quota_go_demote_ok(struct gfs2_glock *gl)
417 return !atomic_read(&gl->gl_lvb_count);
420 struct gfs2_glock_operations gfs2_meta_glops = {
421 .go_xmote_th = gfs2_glock_xmote_th,
422 .go_drop_th = gfs2_glock_drop_th,
423 .go_sync = meta_go_sync,
424 .go_inval = meta_go_inval,
425 .go_demote_ok = meta_go_demote_ok,
426 .go_type = LM_TYPE_META
429 struct gfs2_glock_operations gfs2_inode_glops = {
430 .go_xmote_th = inode_go_xmote_th,
431 .go_xmote_bh = inode_go_xmote_bh,
432 .go_drop_th = inode_go_drop_th,
433 .go_sync = inode_go_sync,
434 .go_inval = inode_go_inval,
435 .go_demote_ok = inode_go_demote_ok,
436 .go_lock = inode_go_lock,
437 .go_unlock = inode_go_unlock,
438 .go_greedy = inode_greedy,
439 .go_type = LM_TYPE_INODE
442 struct gfs2_glock_operations gfs2_rgrp_glops = {
443 .go_xmote_th = gfs2_glock_xmote_th,
444 .go_drop_th = gfs2_glock_drop_th,
445 .go_sync = meta_go_sync,
446 .go_inval = meta_go_inval,
447 .go_demote_ok = rgrp_go_demote_ok,
448 .go_lock = rgrp_go_lock,
449 .go_unlock = rgrp_go_unlock,
450 .go_type = LM_TYPE_RGRP
453 struct gfs2_glock_operations gfs2_trans_glops = {
454 .go_xmote_th = trans_go_xmote_th,
455 .go_xmote_bh = trans_go_xmote_bh,
456 .go_drop_th = trans_go_drop_th,
457 .go_type = LM_TYPE_NONDISK
460 struct gfs2_glock_operations gfs2_iopen_glops = {
461 .go_xmote_th = gfs2_glock_xmote_th,
462 .go_drop_th = gfs2_glock_drop_th,
463 .go_callback = gfs2_iopen_go_callback,
464 .go_type = LM_TYPE_IOPEN
467 struct gfs2_glock_operations gfs2_flock_glops = {
468 .go_xmote_th = gfs2_glock_xmote_th,
469 .go_drop_th = gfs2_glock_drop_th,
470 .go_type = LM_TYPE_FLOCK
473 struct gfs2_glock_operations gfs2_nondisk_glops = {
474 .go_xmote_th = gfs2_glock_xmote_th,
475 .go_drop_th = gfs2_glock_drop_th,
476 .go_type = LM_TYPE_NONDISK
479 struct gfs2_glock_operations gfs2_quota_glops = {
480 .go_xmote_th = gfs2_glock_xmote_th,
481 .go_drop_th = gfs2_glock_drop_th,
482 .go_demote_ok = quota_go_demote_ok,
483 .go_type = LM_TYPE_QUOTA
486 struct gfs2_glock_operations gfs2_journal_glops = {
487 .go_xmote_th = gfs2_glock_xmote_th,
488 .go_drop_th = gfs2_glock_drop_th,
489 .go_type = LM_TYPE_JOURNAL