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>
18 #include "lm_interface.h"
32 * gfs2_pte_inval - Sync and invalidate all PTEs associated with a glock
37 static void gfs2_pte_inval(struct gfs2_glock
*gl
)
39 struct gfs2_inode
*ip
;
44 if (!ip
|| !S_ISREG(ip
->i_di
.di_mode
))
47 if (!test_bit(GIF_PAGED
, &ip
->i_flags
))
50 unmap_shared_mapping_range(inode
->i_mapping
, 0, 0);
52 if (test_bit(GIF_SW_PAGED
, &ip
->i_flags
))
53 set_bit(GLF_DIRTY
, &gl
->gl_flags
);
55 clear_bit(GIF_SW_PAGED
, &ip
->i_flags
);
59 * gfs2_page_inval - Invalidate all pages associated with a glock
64 static void gfs2_page_inval(struct gfs2_glock
*gl
)
66 struct gfs2_inode
*ip
;
71 if (!ip
|| !S_ISREG(ip
->i_di
.di_mode
))
74 truncate_inode_pages(inode
->i_mapping
, 0);
75 gfs2_assert_withdraw(GFS2_SB(&ip
->i_inode
), !inode
->i_mapping
->nrpages
);
76 clear_bit(GIF_PAGED
, &ip
->i_flags
);
80 * gfs2_page_sync - Sync the data pages (not metadata) associated with a glock
82 * @flags: DIO_START | DIO_WAIT
84 * Syncs data (not metadata) for a regular file.
85 * No-op for all other types.
88 static void gfs2_page_sync(struct gfs2_glock
*gl
, int flags
)
90 struct gfs2_inode
*ip
;
92 struct address_space
*mapping
;
97 if (!ip
|| !S_ISREG(ip
->i_di
.di_mode
))
100 mapping
= inode
->i_mapping
;
102 if (flags
& DIO_START
)
103 filemap_fdatawrite(mapping
);
104 if (!error
&& (flags
& DIO_WAIT
))
105 error
= filemap_fdatawait(mapping
);
107 /* Put back any errors cleared by filemap_fdatawait()
108 so they can be caught by someone who can pass them
111 if (error
== -ENOSPC
)
112 set_bit(AS_ENOSPC
, &mapping
->flags
);
114 set_bit(AS_EIO
, &mapping
->flags
);
119 * meta_go_sync - sync out the metadata for this glock
123 * Called when demoting or unlocking an EX glock. We must flush
124 * to disk all dirty buffers/pages relating to this glock, and must not
125 * not return to caller to demote/unlock the glock until I/O is complete.
128 static void meta_go_sync(struct gfs2_glock
*gl
, int flags
)
130 if (!(flags
& DIO_METADATA
))
133 if (test_and_clear_bit(GLF_DIRTY
, &gl
->gl_flags
)) {
134 gfs2_log_flush(gl
->gl_sbd
, gl
);
135 gfs2_meta_sync(gl
, flags
| DIO_START
| DIO_WAIT
);
136 if (flags
& DIO_RELEASE
)
137 gfs2_ail_empty_gl(gl
);
143 * meta_go_inval - invalidate the metadata for this glock
149 static void meta_go_inval(struct gfs2_glock
*gl
, int flags
)
151 if (!(flags
& DIO_METADATA
))
159 * inode_go_xmote_th - promote/demote a glock
161 * @state: the requested state
166 static void inode_go_xmote_th(struct gfs2_glock
*gl
, unsigned int state
,
169 if (gl
->gl_state
!= LM_ST_UNLOCKED
)
171 gfs2_glock_xmote_th(gl
, state
, flags
);
175 * inode_go_xmote_bh - After promoting/demoting a glock
180 static void inode_go_xmote_bh(struct gfs2_glock
*gl
)
182 struct gfs2_holder
*gh
= gl
->gl_req_gh
;
183 struct buffer_head
*bh
;
186 if (gl
->gl_state
!= LM_ST_UNLOCKED
&&
187 (!gh
|| !(gh
->gh_flags
& GL_SKIP
))) {
188 error
= gfs2_meta_read(gl
, gl
->gl_name
.ln_number
, DIO_START
,
196 * inode_go_drop_th - unlock a glock
199 * Invoked from rq_demote().
200 * Another node needs the lock in EXCLUSIVE mode, or lock (unused for too long)
201 * is being purged from our node's glock cache; we're dropping lock.
204 static void inode_go_drop_th(struct gfs2_glock
*gl
)
207 gfs2_glock_drop_th(gl
);
211 * inode_go_sync - Sync the dirty data and/or metadata for an inode glock
212 * @gl: the glock protecting the inode
217 static void inode_go_sync(struct gfs2_glock
*gl
, int flags
)
219 int meta
= (flags
& DIO_METADATA
);
220 int data
= (flags
& DIO_DATA
);
222 if (test_bit(GLF_DIRTY
, &gl
->gl_flags
)) {
224 gfs2_page_sync(gl
, flags
| DIO_START
);
225 gfs2_log_flush(gl
->gl_sbd
, gl
);
226 gfs2_meta_sync(gl
, flags
| DIO_START
| DIO_WAIT
);
227 gfs2_page_sync(gl
, flags
| DIO_WAIT
);
228 clear_bit(GLF_DIRTY
, &gl
->gl_flags
);
230 gfs2_log_flush(gl
->gl_sbd
, gl
);
231 gfs2_meta_sync(gl
, flags
| DIO_START
| DIO_WAIT
);
233 gfs2_page_sync(gl
, flags
| DIO_START
| DIO_WAIT
);
234 if (flags
& DIO_RELEASE
)
235 gfs2_ail_empty_gl(gl
);
241 * inode_go_inval - prepare a inode glock to be released
247 static void inode_go_inval(struct gfs2_glock
*gl
, int flags
)
249 int meta
= (flags
& DIO_METADATA
);
250 int data
= (flags
& DIO_DATA
);
261 * inode_go_demote_ok - Check to see if it's ok to unlock an inode glock
264 * Returns: 1 if it's ok
267 static int inode_go_demote_ok(struct gfs2_glock
*gl
)
269 struct gfs2_sbd
*sdp
= gl
->gl_sbd
;
272 if (!gl
->gl_object
&& !gl
->gl_aspace
->i_mapping
->nrpages
)
274 else if (!sdp
->sd_args
.ar_localcaching
&&
275 time_after_eq(jiffies
, gl
->gl_stamp
+
276 gfs2_tune_get(sdp
, gt_demote_secs
) * HZ
))
283 * inode_go_lock - operation done after an inode lock is locked by a process
290 static int inode_go_lock(struct gfs2_holder
*gh
)
292 struct gfs2_glock
*gl
= gh
->gh_gl
;
293 struct gfs2_inode
*ip
= gl
->gl_object
;
299 if (ip
->i_vn
!= gl
->gl_vn
) {
300 error
= gfs2_inode_refresh(ip
);
303 gfs2_inode_attr_in(ip
);
306 if ((ip
->i_di
.di_flags
& GFS2_DIF_TRUNC_IN_PROG
) &&
307 (gl
->gl_state
== LM_ST_EXCLUSIVE
) &&
308 (gh
->gh_flags
& GL_LOCAL_EXCL
))
309 error
= gfs2_truncatei_resume(ip
);
315 * inode_go_unlock - operation done before an inode lock is unlocked by a
322 static void inode_go_unlock(struct gfs2_holder
*gh
)
324 struct gfs2_glock
*gl
= gh
->gh_gl
;
325 struct gfs2_inode
*ip
= gl
->gl_object
;
328 if (test_bit(GLF_DIRTY
, &gl
->gl_flags
))
329 gfs2_inode_attr_in(ip
);
331 gfs2_meta_cache_flush(ip
);
341 static void inode_greedy(struct gfs2_glock
*gl
)
343 struct gfs2_sbd
*sdp
= gl
->gl_sbd
;
344 struct gfs2_inode
*ip
= gl
->gl_object
;
345 unsigned int quantum
= gfs2_tune_get(sdp
, gt_greedy_quantum
);
346 unsigned int max
= gfs2_tune_get(sdp
, gt_greedy_max
);
347 unsigned int new_time
;
349 spin_lock(&ip
->i_spin
);
351 if (time_after(ip
->i_last_pfault
+ quantum
, jiffies
)) {
352 new_time
= ip
->i_greedy
+ quantum
;
356 new_time
= ip
->i_greedy
- quantum
;
357 if (!new_time
|| new_time
> max
)
361 ip
->i_greedy
= new_time
;
363 spin_unlock(&ip
->i_spin
);
369 * rgrp_go_demote_ok - Check to see if it's ok to unlock a RG's glock
372 * Returns: 1 if it's ok
375 static int rgrp_go_demote_ok(struct gfs2_glock
*gl
)
377 return !gl
->gl_aspace
->i_mapping
->nrpages
;
381 * rgrp_go_lock - operation done after an rgrp lock is locked by
382 * a first holder on this node.
389 static int rgrp_go_lock(struct gfs2_holder
*gh
)
391 return gfs2_rgrp_bh_get(gh
->gh_gl
->gl_object
);
395 * rgrp_go_unlock - operation done before an rgrp lock is unlocked by
396 * a last holder on this node.
402 static void rgrp_go_unlock(struct gfs2_holder
*gh
)
404 gfs2_rgrp_bh_put(gh
->gh_gl
->gl_object
);
408 * trans_go_xmote_th - promote/demote the transaction glock
410 * @state: the requested state
415 static void trans_go_xmote_th(struct gfs2_glock
*gl
, unsigned int state
,
418 struct gfs2_sbd
*sdp
= gl
->gl_sbd
;
420 if (gl
->gl_state
!= LM_ST_UNLOCKED
&&
421 test_bit(SDF_JOURNAL_LIVE
, &sdp
->sd_flags
)) {
422 gfs2_meta_syncfs(sdp
);
423 gfs2_log_shutdown(sdp
);
426 gfs2_glock_xmote_th(gl
, state
, flags
);
430 * trans_go_xmote_bh - After promoting/demoting the transaction glock
435 static void trans_go_xmote_bh(struct gfs2_glock
*gl
)
437 struct gfs2_sbd
*sdp
= gl
->gl_sbd
;
438 struct gfs2_inode
*ip
= GFS2_I(sdp
->sd_jdesc
->jd_inode
);
439 struct gfs2_glock
*j_gl
= ip
->i_gl
;
440 struct gfs2_log_header head
;
443 if (gl
->gl_state
!= LM_ST_UNLOCKED
&&
444 test_bit(SDF_JOURNAL_LIVE
, &sdp
->sd_flags
)) {
445 gfs2_meta_cache_flush(GFS2_I(sdp
->sd_jdesc
->jd_inode
));
446 j_gl
->gl_ops
->go_inval(j_gl
, DIO_METADATA
| DIO_DATA
);
448 error
= gfs2_find_jhead(sdp
->sd_jdesc
, &head
);
451 if (!(head
.lh_flags
& GFS2_LOG_HEAD_UNMOUNT
))
454 /* Initialize some head of the log stuff */
455 if (!test_bit(SDF_SHUTDOWN
, &sdp
->sd_flags
)) {
456 sdp
->sd_log_sequence
= head
.lh_sequence
+ 1;
457 gfs2_log_pointers_init(sdp
, head
.lh_blkno
);
463 * trans_go_drop_th - unlock the transaction glock
466 * We want to sync the device even with localcaching. Remember
467 * that localcaching journal replay only marks buffers dirty.
470 static void trans_go_drop_th(struct gfs2_glock
*gl
)
472 struct gfs2_sbd
*sdp
= gl
->gl_sbd
;
474 if (test_bit(SDF_JOURNAL_LIVE
, &sdp
->sd_flags
)) {
475 gfs2_meta_syncfs(sdp
);
476 gfs2_log_shutdown(sdp
);
479 gfs2_glock_drop_th(gl
);
483 * quota_go_demote_ok - Check to see if it's ok to unlock a quota glock
486 * Returns: 1 if it's ok
489 static int quota_go_demote_ok(struct gfs2_glock
*gl
)
491 return !atomic_read(&gl
->gl_lvb_count
);
494 const struct gfs2_glock_operations gfs2_meta_glops
= {
495 .go_xmote_th
= gfs2_glock_xmote_th
,
496 .go_drop_th
= gfs2_glock_drop_th
,
497 .go_type
= LM_TYPE_META
500 const struct gfs2_glock_operations gfs2_inode_glops
= {
501 .go_xmote_th
= inode_go_xmote_th
,
502 .go_xmote_bh
= inode_go_xmote_bh
,
503 .go_drop_th
= inode_go_drop_th
,
504 .go_sync
= inode_go_sync
,
505 .go_inval
= inode_go_inval
,
506 .go_demote_ok
= inode_go_demote_ok
,
507 .go_lock
= inode_go_lock
,
508 .go_unlock
= inode_go_unlock
,
509 .go_greedy
= inode_greedy
,
510 .go_type
= LM_TYPE_INODE
513 const struct gfs2_glock_operations gfs2_rgrp_glops
= {
514 .go_xmote_th
= gfs2_glock_xmote_th
,
515 .go_drop_th
= gfs2_glock_drop_th
,
516 .go_sync
= meta_go_sync
,
517 .go_inval
= meta_go_inval
,
518 .go_demote_ok
= rgrp_go_demote_ok
,
519 .go_lock
= rgrp_go_lock
,
520 .go_unlock
= rgrp_go_unlock
,
521 .go_type
= LM_TYPE_RGRP
524 const struct gfs2_glock_operations gfs2_trans_glops
= {
525 .go_xmote_th
= trans_go_xmote_th
,
526 .go_xmote_bh
= trans_go_xmote_bh
,
527 .go_drop_th
= trans_go_drop_th
,
528 .go_type
= LM_TYPE_NONDISK
531 const struct gfs2_glock_operations gfs2_iopen_glops
= {
532 .go_xmote_th
= gfs2_glock_xmote_th
,
533 .go_drop_th
= gfs2_glock_drop_th
,
534 .go_callback
= gfs2_iopen_go_callback
,
535 .go_type
= LM_TYPE_IOPEN
538 const struct gfs2_glock_operations gfs2_flock_glops
= {
539 .go_xmote_th
= gfs2_glock_xmote_th
,
540 .go_drop_th
= gfs2_glock_drop_th
,
541 .go_type
= LM_TYPE_FLOCK
544 const struct gfs2_glock_operations gfs2_nondisk_glops
= {
545 .go_xmote_th
= gfs2_glock_xmote_th
,
546 .go_drop_th
= gfs2_glock_drop_th
,
547 .go_type
= LM_TYPE_NONDISK
550 const struct gfs2_glock_operations gfs2_quota_glops
= {
551 .go_xmote_th
= gfs2_glock_xmote_th
,
552 .go_drop_th
= gfs2_glock_drop_th
,
553 .go_demote_ok
= quota_go_demote_ok
,
554 .go_type
= LM_TYPE_QUOTA
557 const struct gfs2_glock_operations gfs2_journal_glops
= {
558 .go_xmote_th
= gfs2_glock_xmote_th
,
559 .go_drop_th
= gfs2_glock_drop_th
,
560 .go_type
= LM_TYPE_JOURNAL