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;
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 blkno = bh->b_blocknr;
61 gfs2_assert_withdraw(sdp, !buffer_busy(bh));
63 gfs2_remove_from_ail(NULL, bd);
66 gfs2_trans_add_revoke(sdp, blkno);
70 gfs2_assert_withdraw(sdp, !atomic_read(&gl->gl_ail_count));
74 gfs2_log_flush(sdp, NULL);
78 * gfs2_pte_inval - Sync and invalidate all PTEs associated with a glock
83 static void gfs2_pte_inval(struct gfs2_glock *gl)
85 struct gfs2_inode *ip;
90 if (!ip || !S_ISREG(inode->i_mode))
93 if (!test_bit(GIF_PAGED, &ip->i_flags))
96 unmap_shared_mapping_range(inode->i_mapping, 0, 0);
98 if (test_bit(GIF_SW_PAGED, &ip->i_flags))
99 set_bit(GLF_DIRTY, &gl->gl_flags);
101 clear_bit(GIF_SW_PAGED, &ip->i_flags);
105 * meta_go_sync - sync out the metadata for this glock
108 * Called when demoting or unlocking an EX glock. We must flush
109 * to disk all dirty buffers/pages relating to this glock, and must not
110 * not return to caller to demote/unlock the glock until I/O is complete.
113 static void meta_go_sync(struct gfs2_glock *gl)
115 if (gl->gl_state != LM_ST_EXCLUSIVE)
118 if (test_and_clear_bit(GLF_DIRTY, &gl->gl_flags)) {
119 gfs2_log_flush(gl->gl_sbd, gl);
121 gfs2_ail_empty_gl(gl);
126 * meta_go_inval - invalidate the metadata for this glock
132 static void meta_go_inval(struct gfs2_glock *gl, int flags)
134 if (!(flags & DIO_METADATA))
142 * inode_go_sync - Sync the dirty data and/or metadata for an inode glock
143 * @gl: the glock protecting the inode
147 static void inode_go_sync(struct gfs2_glock *gl)
149 struct gfs2_inode *ip = gl->gl_object;
151 if (ip && !S_ISREG(ip->i_inode.i_mode))
154 if (test_bit(GLF_DIRTY, &gl->gl_flags)) {
155 if (ip && !gfs2_is_jdata(ip))
156 filemap_fdatawrite(ip->i_inode.i_mapping);
157 gfs2_log_flush(gl->gl_sbd, gl);
158 if (ip && gfs2_is_jdata(ip))
159 filemap_fdatawrite(ip->i_inode.i_mapping);
162 struct address_space *mapping = ip->i_inode.i_mapping;
163 int error = filemap_fdatawait(mapping);
164 mapping_set_error(mapping, error);
166 clear_bit(GLF_DIRTY, &gl->gl_flags);
167 gfs2_ail_empty_gl(gl);
172 * inode_go_xmote_th - promote/demote a glock
174 * @state: the requested state
179 static void inode_go_xmote_th(struct gfs2_glock *gl)
181 if (gl->gl_state != LM_ST_UNLOCKED)
183 if (gl->gl_state == LM_ST_EXCLUSIVE)
188 * inode_go_xmote_bh - After promoting/demoting a glock
193 static void inode_go_xmote_bh(struct gfs2_glock *gl)
195 struct gfs2_holder *gh = gl->gl_req_gh;
196 struct buffer_head *bh;
199 if (gl->gl_state != LM_ST_UNLOCKED &&
200 (!gh || !(gh->gh_flags & GL_SKIP))) {
201 error = gfs2_meta_read(gl, gl->gl_name.ln_number, 0, &bh);
208 * inode_go_drop_th - unlock a glock
211 * Invoked from rq_demote().
212 * Another node needs the lock in EXCLUSIVE mode, or lock (unused for too long)
213 * is being purged from our node's glock cache; we're dropping lock.
216 static void inode_go_drop_th(struct gfs2_glock *gl)
219 if (gl->gl_state == LM_ST_EXCLUSIVE)
224 * inode_go_inval - prepare a inode glock to be released
230 static void inode_go_inval(struct gfs2_glock *gl, int flags)
232 struct gfs2_inode *ip = gl->gl_object;
233 int meta = (flags & DIO_METADATA);
238 set_bit(GIF_INVALID, &ip->i_flags);
241 if (ip && S_ISREG(ip->i_inode.i_mode)) {
242 truncate_inode_pages(ip->i_inode.i_mapping, 0);
243 clear_bit(GIF_PAGED, &ip->i_flags);
248 * inode_go_demote_ok - Check to see if it's ok to unlock an inode glock
251 * Returns: 1 if it's ok
254 static int inode_go_demote_ok(struct gfs2_glock *gl)
256 struct gfs2_sbd *sdp = gl->gl_sbd;
259 if (!gl->gl_object && !gl->gl_aspace->i_mapping->nrpages)
261 else if (!sdp->sd_args.ar_localcaching &&
262 time_after_eq(jiffies, gl->gl_stamp +
263 gfs2_tune_get(sdp, gt_demote_secs) * HZ))
270 * inode_go_lock - operation done after an inode lock is locked by a process
277 static int inode_go_lock(struct gfs2_holder *gh)
279 struct gfs2_glock *gl = gh->gh_gl;
280 struct gfs2_inode *ip = gl->gl_object;
286 if (test_bit(GIF_INVALID, &ip->i_flags)) {
287 error = gfs2_inode_refresh(ip);
292 if ((ip->i_di.di_flags & GFS2_DIF_TRUNC_IN_PROG) &&
293 (gl->gl_state == LM_ST_EXCLUSIVE) &&
294 (gh->gh_state == LM_ST_EXCLUSIVE))
295 error = gfs2_truncatei_resume(ip);
301 * inode_go_unlock - operation done before an inode lock is unlocked by a
308 static void inode_go_unlock(struct gfs2_holder *gh)
310 struct gfs2_glock *gl = gh->gh_gl;
311 struct gfs2_inode *ip = gl->gl_object;
314 gfs2_meta_cache_flush(ip);
318 * rgrp_go_demote_ok - Check to see if it's ok to unlock a RG's glock
321 * Returns: 1 if it's ok
324 static int rgrp_go_demote_ok(struct gfs2_glock *gl)
326 return !gl->gl_aspace->i_mapping->nrpages;
330 * rgrp_go_lock - operation done after an rgrp lock is locked by
331 * a first holder on this node.
338 static int rgrp_go_lock(struct gfs2_holder *gh)
340 return gfs2_rgrp_bh_get(gh->gh_gl->gl_object);
344 * rgrp_go_unlock - operation done before an rgrp lock is unlocked by
345 * a last holder on this node.
351 static void rgrp_go_unlock(struct gfs2_holder *gh)
353 gfs2_rgrp_bh_put(gh->gh_gl->gl_object);
357 * trans_go_xmote_th - promote/demote the transaction glock
359 * @state: the requested state
364 static void trans_go_xmote_th(struct gfs2_glock *gl)
366 struct gfs2_sbd *sdp = gl->gl_sbd;
368 if (gl->gl_state != LM_ST_UNLOCKED &&
369 test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
370 gfs2_meta_syncfs(sdp);
371 gfs2_log_shutdown(sdp);
376 * trans_go_xmote_bh - After promoting/demoting the transaction glock
381 static void trans_go_xmote_bh(struct gfs2_glock *gl)
383 struct gfs2_sbd *sdp = gl->gl_sbd;
384 struct gfs2_inode *ip = GFS2_I(sdp->sd_jdesc->jd_inode);
385 struct gfs2_glock *j_gl = ip->i_gl;
386 struct gfs2_log_header_host head;
389 if (gl->gl_state != LM_ST_UNLOCKED &&
390 test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
391 gfs2_meta_cache_flush(GFS2_I(sdp->sd_jdesc->jd_inode));
392 j_gl->gl_ops->go_inval(j_gl, DIO_METADATA);
394 error = gfs2_find_jhead(sdp->sd_jdesc, &head);
397 if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT))
400 /* Initialize some head of the log stuff */
401 if (!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) {
402 sdp->sd_log_sequence = head.lh_sequence + 1;
403 gfs2_log_pointers_init(sdp, head.lh_blkno);
409 * trans_go_drop_th - unlock the transaction glock
412 * We want to sync the device even with localcaching. Remember
413 * that localcaching journal replay only marks buffers dirty.
416 static void trans_go_drop_th(struct gfs2_glock *gl)
418 struct gfs2_sbd *sdp = gl->gl_sbd;
420 if (test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
421 gfs2_meta_syncfs(sdp);
422 gfs2_log_shutdown(sdp);
427 * quota_go_demote_ok - Check to see if it's ok to unlock a quota glock
430 * Returns: 1 if it's ok
433 static int quota_go_demote_ok(struct gfs2_glock *gl)
435 return !atomic_read(&gl->gl_lvb_count);
438 const struct gfs2_glock_operations gfs2_meta_glops = {
439 .go_xmote_th = meta_go_sync,
440 .go_drop_th = meta_go_sync,
441 .go_type = LM_TYPE_META,
444 const struct gfs2_glock_operations gfs2_inode_glops = {
445 .go_xmote_th = inode_go_xmote_th,
446 .go_xmote_bh = inode_go_xmote_bh,
447 .go_drop_th = inode_go_drop_th,
448 .go_inval = inode_go_inval,
449 .go_demote_ok = inode_go_demote_ok,
450 .go_lock = inode_go_lock,
451 .go_unlock = inode_go_unlock,
452 .go_type = LM_TYPE_INODE,
453 .go_min_hold_time = HZ / 10,
456 const struct gfs2_glock_operations gfs2_rgrp_glops = {
457 .go_xmote_th = meta_go_sync,
458 .go_drop_th = meta_go_sync,
459 .go_inval = meta_go_inval,
460 .go_demote_ok = rgrp_go_demote_ok,
461 .go_lock = rgrp_go_lock,
462 .go_unlock = rgrp_go_unlock,
463 .go_type = LM_TYPE_RGRP,
464 .go_min_hold_time = HZ / 10,
467 const struct gfs2_glock_operations gfs2_trans_glops = {
468 .go_xmote_th = trans_go_xmote_th,
469 .go_xmote_bh = trans_go_xmote_bh,
470 .go_drop_th = trans_go_drop_th,
471 .go_type = LM_TYPE_NONDISK,
474 const struct gfs2_glock_operations gfs2_iopen_glops = {
475 .go_type = LM_TYPE_IOPEN,
478 const struct gfs2_glock_operations gfs2_flock_glops = {
479 .go_type = LM_TYPE_FLOCK,
482 const struct gfs2_glock_operations gfs2_nondisk_glops = {
483 .go_type = LM_TYPE_NONDISK,
486 const struct gfs2_glock_operations gfs2_quota_glops = {
487 .go_demote_ok = quota_go_demote_ok,
488 .go_type = LM_TYPE_QUOTA,
491 const struct gfs2_glock_operations gfs2_journal_glops = {
492 .go_type = LM_TYPE_JOURNAL,