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));
64 list_del(&bd->bd_ail_st_list);
65 list_del(&bd->bd_ail_gl_list);
66 atomic_dec(&gl->gl_ail_count);
70 gfs2_trans_add_revoke(sdp, blkno);
74 gfs2_assert_withdraw(sdp, !atomic_read(&gl->gl_ail_count));
78 gfs2_log_flush(sdp, NULL);
82 * gfs2_pte_inval - Sync and invalidate all PTEs associated with a glock
87 static void gfs2_pte_inval(struct gfs2_glock *gl)
89 struct gfs2_inode *ip;
94 if (!ip || !S_ISREG(inode->i_mode))
97 if (!test_bit(GIF_PAGED, &ip->i_flags))
100 unmap_shared_mapping_range(inode->i_mapping, 0, 0);
102 if (test_bit(GIF_SW_PAGED, &ip->i_flags))
103 set_bit(GLF_DIRTY, &gl->gl_flags);
105 clear_bit(GIF_SW_PAGED, &ip->i_flags);
109 * meta_go_sync - sync out the metadata for this glock
112 * Called when demoting or unlocking an EX glock. We must flush
113 * to disk all dirty buffers/pages relating to this glock, and must not
114 * not return to caller to demote/unlock the glock until I/O is complete.
117 static void meta_go_sync(struct gfs2_glock *gl)
119 if (gl->gl_state != LM_ST_EXCLUSIVE)
122 if (test_and_clear_bit(GLF_DIRTY, &gl->gl_flags)) {
123 gfs2_log_flush(gl->gl_sbd, gl);
125 gfs2_ail_empty_gl(gl);
130 * meta_go_inval - invalidate the metadata for this glock
136 static void meta_go_inval(struct gfs2_glock *gl, int flags)
138 if (!(flags & DIO_METADATA))
146 * inode_go_sync - Sync the dirty data and/or metadata for an inode glock
147 * @gl: the glock protecting the inode
151 static void inode_go_sync(struct gfs2_glock *gl)
153 struct gfs2_inode *ip = gl->gl_object;
155 if (ip && !S_ISREG(ip->i_inode.i_mode))
158 if (test_bit(GLF_DIRTY, &gl->gl_flags)) {
159 if (ip && !gfs2_is_jdata(ip))
160 filemap_fdatawrite(ip->i_inode.i_mapping);
161 gfs2_log_flush(gl->gl_sbd, gl);
162 if (ip && gfs2_is_jdata(ip))
163 filemap_fdatawrite(ip->i_inode.i_mapping);
166 struct address_space *mapping = ip->i_inode.i_mapping;
167 int error = filemap_fdatawait(mapping);
168 mapping_set_error(mapping, error);
170 clear_bit(GLF_DIRTY, &gl->gl_flags);
171 gfs2_ail_empty_gl(gl);
176 * inode_go_xmote_th - promote/demote a glock
178 * @state: the requested state
183 static void inode_go_xmote_th(struct gfs2_glock *gl)
185 if (gl->gl_state != LM_ST_UNLOCKED)
187 if (gl->gl_state == LM_ST_EXCLUSIVE)
192 * inode_go_xmote_bh - After promoting/demoting a glock
197 static void inode_go_xmote_bh(struct gfs2_glock *gl)
199 struct gfs2_holder *gh = gl->gl_req_gh;
200 struct buffer_head *bh;
203 if (gl->gl_state != LM_ST_UNLOCKED &&
204 (!gh || !(gh->gh_flags & GL_SKIP))) {
205 error = gfs2_meta_read(gl, gl->gl_name.ln_number, 0, &bh);
212 * inode_go_drop_th - unlock a glock
215 * Invoked from rq_demote().
216 * Another node needs the lock in EXCLUSIVE mode, or lock (unused for too long)
217 * is being purged from our node's glock cache; we're dropping lock.
220 static void inode_go_drop_th(struct gfs2_glock *gl)
223 if (gl->gl_state == LM_ST_EXCLUSIVE)
228 * inode_go_inval - prepare a inode glock to be released
234 static void inode_go_inval(struct gfs2_glock *gl, int flags)
236 struct gfs2_inode *ip = gl->gl_object;
237 int meta = (flags & DIO_METADATA);
242 set_bit(GIF_INVALID, &ip->i_flags);
245 if (ip && S_ISREG(ip->i_inode.i_mode)) {
246 truncate_inode_pages(ip->i_inode.i_mapping, 0);
247 clear_bit(GIF_PAGED, &ip->i_flags);
252 * inode_go_demote_ok - Check to see if it's ok to unlock an inode glock
255 * Returns: 1 if it's ok
258 static int inode_go_demote_ok(struct gfs2_glock *gl)
260 struct gfs2_sbd *sdp = gl->gl_sbd;
263 if (!gl->gl_object && !gl->gl_aspace->i_mapping->nrpages)
265 else if (!sdp->sd_args.ar_localcaching &&
266 time_after_eq(jiffies, gl->gl_stamp +
267 gfs2_tune_get(sdp, gt_demote_secs) * HZ))
274 * inode_go_lock - operation done after an inode lock is locked by a process
281 static int inode_go_lock(struct gfs2_holder *gh)
283 struct gfs2_glock *gl = gh->gh_gl;
284 struct gfs2_inode *ip = gl->gl_object;
290 if (test_bit(GIF_INVALID, &ip->i_flags)) {
291 error = gfs2_inode_refresh(ip);
296 if ((ip->i_di.di_flags & GFS2_DIF_TRUNC_IN_PROG) &&
297 (gl->gl_state == LM_ST_EXCLUSIVE) &&
298 (gh->gh_state == LM_ST_EXCLUSIVE))
299 error = gfs2_truncatei_resume(ip);
305 * inode_go_unlock - operation done before an inode lock is unlocked by a
312 static void inode_go_unlock(struct gfs2_holder *gh)
314 struct gfs2_glock *gl = gh->gh_gl;
315 struct gfs2_inode *ip = gl->gl_object;
318 gfs2_meta_cache_flush(ip);
322 * rgrp_go_demote_ok - Check to see if it's ok to unlock a RG's glock
325 * Returns: 1 if it's ok
328 static int rgrp_go_demote_ok(struct gfs2_glock *gl)
330 return !gl->gl_aspace->i_mapping->nrpages;
334 * rgrp_go_lock - operation done after an rgrp lock is locked by
335 * a first holder on this node.
342 static int rgrp_go_lock(struct gfs2_holder *gh)
344 return gfs2_rgrp_bh_get(gh->gh_gl->gl_object);
348 * rgrp_go_unlock - operation done before an rgrp lock is unlocked by
349 * a last holder on this node.
355 static void rgrp_go_unlock(struct gfs2_holder *gh)
357 gfs2_rgrp_bh_put(gh->gh_gl->gl_object);
361 * trans_go_xmote_th - promote/demote the transaction glock
363 * @state: the requested state
368 static void trans_go_xmote_th(struct gfs2_glock *gl)
370 struct gfs2_sbd *sdp = gl->gl_sbd;
372 if (gl->gl_state != LM_ST_UNLOCKED &&
373 test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
374 gfs2_meta_syncfs(sdp);
375 gfs2_log_shutdown(sdp);
380 * trans_go_xmote_bh - After promoting/demoting the transaction glock
385 static void trans_go_xmote_bh(struct gfs2_glock *gl)
387 struct gfs2_sbd *sdp = gl->gl_sbd;
388 struct gfs2_inode *ip = GFS2_I(sdp->sd_jdesc->jd_inode);
389 struct gfs2_glock *j_gl = ip->i_gl;
390 struct gfs2_log_header_host head;
393 if (gl->gl_state != LM_ST_UNLOCKED &&
394 test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
395 gfs2_meta_cache_flush(GFS2_I(sdp->sd_jdesc->jd_inode));
396 j_gl->gl_ops->go_inval(j_gl, DIO_METADATA);
398 error = gfs2_find_jhead(sdp->sd_jdesc, &head);
401 if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT))
404 /* Initialize some head of the log stuff */
405 if (!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) {
406 sdp->sd_log_sequence = head.lh_sequence + 1;
407 gfs2_log_pointers_init(sdp, head.lh_blkno);
413 * trans_go_drop_th - unlock the transaction glock
416 * We want to sync the device even with localcaching. Remember
417 * that localcaching journal replay only marks buffers dirty.
420 static void trans_go_drop_th(struct gfs2_glock *gl)
422 struct gfs2_sbd *sdp = gl->gl_sbd;
424 if (test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
425 gfs2_meta_syncfs(sdp);
426 gfs2_log_shutdown(sdp);
431 * quota_go_demote_ok - Check to see if it's ok to unlock a quota glock
434 * Returns: 1 if it's ok
437 static int quota_go_demote_ok(struct gfs2_glock *gl)
439 return !atomic_read(&gl->gl_lvb_count);
442 const struct gfs2_glock_operations gfs2_meta_glops = {
443 .go_xmote_th = meta_go_sync,
444 .go_drop_th = meta_go_sync,
445 .go_type = LM_TYPE_META,
448 const struct gfs2_glock_operations gfs2_inode_glops = {
449 .go_xmote_th = inode_go_xmote_th,
450 .go_xmote_bh = inode_go_xmote_bh,
451 .go_drop_th = inode_go_drop_th,
452 .go_inval = inode_go_inval,
453 .go_demote_ok = inode_go_demote_ok,
454 .go_lock = inode_go_lock,
455 .go_unlock = inode_go_unlock,
456 .go_type = LM_TYPE_INODE,
459 const struct gfs2_glock_operations gfs2_rgrp_glops = {
460 .go_xmote_th = meta_go_sync,
461 .go_drop_th = meta_go_sync,
462 .go_inval = meta_go_inval,
463 .go_demote_ok = rgrp_go_demote_ok,
464 .go_lock = rgrp_go_lock,
465 .go_unlock = rgrp_go_unlock,
466 .go_type = LM_TYPE_RGRP,
469 const struct gfs2_glock_operations gfs2_trans_glops = {
470 .go_xmote_th = trans_go_xmote_th,
471 .go_xmote_bh = trans_go_xmote_bh,
472 .go_drop_th = trans_go_drop_th,
473 .go_type = LM_TYPE_NONDISK,
476 const struct gfs2_glock_operations gfs2_iopen_glops = {
477 .go_type = LM_TYPE_IOPEN,
480 const struct gfs2_glock_operations gfs2_flock_glops = {
481 .go_type = LM_TYPE_FLOCK,
484 const struct gfs2_glock_operations gfs2_nondisk_glops = {
485 .go_type = LM_TYPE_NONDISK,
488 const struct gfs2_glock_operations gfs2_quota_glops = {
489 .go_demote_ok = quota_go_demote_ok,
490 .go_type = LM_TYPE_QUOTA,
493 const struct gfs2_glock_operations gfs2_journal_glops = {
494 .go_type = LM_TYPE_JOURNAL,