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/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>
16 #include <linux/lm_interface.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;
48 blocks = atomic_read(&gl->gl_ail_count);
52 error = gfs2_trans_begin(sdp, 0, blocks);
53 if (gfs2_assert_withdraw(sdp, !error))
57 while (!list_empty(head)) {
58 bd = list_entry(head->next, struct gfs2_bufdata,
61 blkno = bh->b_blocknr;
62 gfs2_assert_withdraw(sdp, !buffer_busy(bh));
65 list_del(&bd->bd_ail_st_list);
66 list_del(&bd->bd_ail_gl_list);
67 atomic_dec(&gl->gl_ail_count);
71 gfs2_trans_add_revoke(sdp, blkno);
75 gfs2_assert_withdraw(sdp, !atomic_read(&gl->gl_ail_count));
79 gfs2_log_flush(sdp, NULL);
83 * gfs2_pte_inval - Sync and invalidate all PTEs associated with a glock
88 static void gfs2_pte_inval(struct gfs2_glock *gl)
90 struct gfs2_inode *ip;
95 if (!ip || !S_ISREG(inode->i_mode))
98 if (!test_bit(GIF_PAGED, &ip->i_flags))
101 unmap_shared_mapping_range(inode->i_mapping, 0, 0);
103 if (test_bit(GIF_SW_PAGED, &ip->i_flags))
104 set_bit(GLF_DIRTY, &gl->gl_flags);
106 clear_bit(GIF_SW_PAGED, &ip->i_flags);
110 * meta_go_sync - sync out the metadata for this glock
113 * Called when demoting or unlocking an EX glock. We must flush
114 * to disk all dirty buffers/pages relating to this glock, and must not
115 * not return to caller to demote/unlock the glock until I/O is complete.
118 static void meta_go_sync(struct gfs2_glock *gl)
120 if (test_and_clear_bit(GLF_DIRTY, &gl->gl_flags)) {
121 gfs2_log_flush(gl->gl_sbd, gl);
123 gfs2_ail_empty_gl(gl);
129 * meta_go_inval - invalidate the metadata for this glock
135 static void meta_go_inval(struct gfs2_glock *gl, int flags)
137 if (!(flags & DIO_METADATA))
145 * inode_go_xmote_th - promote/demote a glock
147 * @state: the requested state
152 static void inode_go_xmote_th(struct gfs2_glock *gl, unsigned int state,
155 if (gl->gl_state != LM_ST_UNLOCKED)
157 gfs2_glock_xmote_th(gl, state, flags);
161 * inode_go_xmote_bh - After promoting/demoting a glock
166 static void inode_go_xmote_bh(struct gfs2_glock *gl)
168 struct gfs2_holder *gh = gl->gl_req_gh;
169 struct buffer_head *bh;
172 if (gl->gl_state != LM_ST_UNLOCKED &&
173 (!gh || !(gh->gh_flags & GL_SKIP))) {
174 error = gfs2_meta_read(gl, gl->gl_name.ln_number, 0, &bh);
181 * inode_go_drop_th - unlock a glock
184 * Invoked from rq_demote().
185 * Another node needs the lock in EXCLUSIVE mode, or lock (unused for too long)
186 * is being purged from our node's glock cache; we're dropping lock.
189 static void inode_go_drop_th(struct gfs2_glock *gl)
192 gfs2_glock_drop_th(gl);
196 * inode_go_sync - Sync the dirty data and/or metadata for an inode glock
197 * @gl: the glock protecting the inode
201 static void inode_go_sync(struct gfs2_glock *gl)
203 struct gfs2_inode *ip = gl->gl_object;
205 if (ip && !S_ISREG(ip->i_inode.i_mode))
208 if (test_bit(GLF_DIRTY, &gl->gl_flags)) {
209 gfs2_log_flush(gl->gl_sbd, gl);
211 filemap_fdatawrite(ip->i_inode.i_mapping);
214 struct address_space *mapping = ip->i_inode.i_mapping;
215 int error = filemap_fdatawait(mapping);
216 if (error == -ENOSPC)
217 set_bit(AS_ENOSPC, &mapping->flags);
219 set_bit(AS_EIO, &mapping->flags);
221 clear_bit(GLF_DIRTY, &gl->gl_flags);
222 gfs2_ail_empty_gl(gl);
227 * inode_go_inval - prepare a inode glock to be released
233 static void inode_go_inval(struct gfs2_glock *gl, int flags)
235 struct gfs2_inode *ip = gl->gl_object;
236 int meta = (flags & DIO_METADATA);
241 set_bit(GIF_INVALID, &ip->i_flags);
244 if (ip && S_ISREG(ip->i_inode.i_mode)) {
245 truncate_inode_pages(ip->i_inode.i_mapping, 0);
246 gfs2_assert_withdraw(GFS2_SB(&ip->i_inode), !ip->i_inode.i_mapping->nrpages);
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, unsigned int state,
371 struct gfs2_sbd *sdp = gl->gl_sbd;
373 if (gl->gl_state != LM_ST_UNLOCKED &&
374 test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
375 gfs2_meta_syncfs(sdp);
376 gfs2_log_shutdown(sdp);
379 gfs2_glock_xmote_th(gl, state, flags);
383 * trans_go_xmote_bh - After promoting/demoting the transaction glock
388 static void trans_go_xmote_bh(struct gfs2_glock *gl)
390 struct gfs2_sbd *sdp = gl->gl_sbd;
391 struct gfs2_inode *ip = GFS2_I(sdp->sd_jdesc->jd_inode);
392 struct gfs2_glock *j_gl = ip->i_gl;
393 struct gfs2_log_header_host head;
396 if (gl->gl_state != LM_ST_UNLOCKED &&
397 test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
398 gfs2_meta_cache_flush(GFS2_I(sdp->sd_jdesc->jd_inode));
399 j_gl->gl_ops->go_inval(j_gl, DIO_METADATA);
401 error = gfs2_find_jhead(sdp->sd_jdesc, &head);
404 if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT))
407 /* Initialize some head of the log stuff */
408 if (!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) {
409 sdp->sd_log_sequence = head.lh_sequence + 1;
410 gfs2_log_pointers_init(sdp, head.lh_blkno);
416 * trans_go_drop_th - unlock the transaction glock
419 * We want to sync the device even with localcaching. Remember
420 * that localcaching journal replay only marks buffers dirty.
423 static void trans_go_drop_th(struct gfs2_glock *gl)
425 struct gfs2_sbd *sdp = gl->gl_sbd;
427 if (test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
428 gfs2_meta_syncfs(sdp);
429 gfs2_log_shutdown(sdp);
432 gfs2_glock_drop_th(gl);
436 * quota_go_demote_ok - Check to see if it's ok to unlock a quota glock
439 * Returns: 1 if it's ok
442 static int quota_go_demote_ok(struct gfs2_glock *gl)
444 return !atomic_read(&gl->gl_lvb_count);
447 const struct gfs2_glock_operations gfs2_meta_glops = {
448 .go_xmote_th = gfs2_glock_xmote_th,
449 .go_drop_th = gfs2_glock_drop_th,
450 .go_type = LM_TYPE_META,
453 const struct gfs2_glock_operations gfs2_inode_glops = {
454 .go_xmote_th = inode_go_xmote_th,
455 .go_xmote_bh = inode_go_xmote_bh,
456 .go_drop_th = inode_go_drop_th,
457 .go_sync = inode_go_sync,
458 .go_inval = inode_go_inval,
459 .go_demote_ok = inode_go_demote_ok,
460 .go_lock = inode_go_lock,
461 .go_unlock = inode_go_unlock,
462 .go_type = LM_TYPE_INODE,
465 const struct gfs2_glock_operations gfs2_rgrp_glops = {
466 .go_xmote_th = gfs2_glock_xmote_th,
467 .go_drop_th = gfs2_glock_drop_th,
468 .go_sync = meta_go_sync,
469 .go_inval = meta_go_inval,
470 .go_demote_ok = rgrp_go_demote_ok,
471 .go_lock = rgrp_go_lock,
472 .go_unlock = rgrp_go_unlock,
473 .go_type = LM_TYPE_RGRP,
476 const struct gfs2_glock_operations gfs2_trans_glops = {
477 .go_xmote_th = trans_go_xmote_th,
478 .go_xmote_bh = trans_go_xmote_bh,
479 .go_drop_th = trans_go_drop_th,
480 .go_type = LM_TYPE_NONDISK,
483 const struct gfs2_glock_operations gfs2_iopen_glops = {
484 .go_xmote_th = gfs2_glock_xmote_th,
485 .go_drop_th = gfs2_glock_drop_th,
486 .go_type = LM_TYPE_IOPEN,
489 const struct gfs2_glock_operations gfs2_flock_glops = {
490 .go_xmote_th = gfs2_glock_xmote_th,
491 .go_drop_th = gfs2_glock_drop_th,
492 .go_type = LM_TYPE_FLOCK,
495 const struct gfs2_glock_operations gfs2_nondisk_glops = {
496 .go_xmote_th = gfs2_glock_xmote_th,
497 .go_drop_th = gfs2_glock_drop_th,
498 .go_type = LM_TYPE_NONDISK,
501 const struct gfs2_glock_operations gfs2_quota_glops = {
502 .go_xmote_th = gfs2_glock_xmote_th,
503 .go_drop_th = gfs2_glock_drop_th,
504 .go_demote_ok = quota_go_demote_ok,
505 .go_type = LM_TYPE_QUOTA,
508 const struct gfs2_glock_operations gfs2_journal_glops = {
509 .go_xmote_th = gfs2_glock_xmote_th,
510 .go_drop_th = gfs2_glock_drop_th,
511 .go_type = LM_TYPE_JOURNAL,