blob: a4ff7b56f5cdbabc8a1e12830bf0e36221a4c53e [file] [log] [blame]
David Teiglandb3b94fa2006-01-16 16:50:04 +00001/*
2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
Bob Petersoncf45b752008-01-31 10:31:39 -06003 * Copyright (C) 2004-2008 Red Hat, Inc. All rights reserved.
David Teiglandb3b94fa2006-01-16 16:50:04 +00004 *
5 * This copyrighted material is made available to anyone wishing to use,
6 * modify, copy, or redistribute it subject to the terms and conditions
Steven Whitehousee9fc2aa2006-09-01 11:05:15 -04007 * of the GNU General Public License version 2.
David Teiglandb3b94fa2006-01-16 16:50:04 +00008 */
9
Joe Perchesd77d1b52014-03-06 12:10:45 -080010#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
11
David Teiglandb3b94fa2006-01-16 16:50:04 +000012#include <linux/sched.h>
13#include <linux/slab.h>
14#include <linux/spinlock.h>
David Teiglandb3b94fa2006-01-16 16:50:04 +000015#include <linux/buffer_head.h>
16#include <linux/delay.h>
17#include <linux/sort.h>
18#include <linux/jhash.h>
Steven Whitehoused0dc80d2006-03-29 14:36:49 -050019#include <linux/kallsyms.h>
Steven Whitehouse5c676f62006-02-27 17:23:27 -050020#include <linux/gfs2_ondisk.h>
Steven Whitehouse24264432006-09-11 21:40:30 -040021#include <linux/list.h>
Steven Whitehousefee852e2007-01-17 15:33:23 +000022#include <linux/wait.h>
akpm@linux-foundation.org95d97b72007-03-05 23:10:39 -080023#include <linux/module.h>
David Teiglandb3b94fa2006-01-16 16:50:04 +000024#include <asm/uaccess.h>
Robert Peterson7c52b162007-03-16 10:26:37 +000025#include <linux/seq_file.h>
26#include <linux/debugfs.h>
Steven Whitehouse8fbbfd22007-08-01 13:57:10 +010027#include <linux/kthread.h>
28#include <linux/freezer.h>
Benjamin Marzinskic4f68a12007-08-23 13:19:05 -050029#include <linux/workqueue.h>
30#include <linux/jiffies.h>
Steven Whitehousebc015cb2011-01-19 09:30:01 +000031#include <linux/rcupdate.h>
32#include <linux/rculist_bl.h>
33#include <linux/bit_spinlock.h>
Steven Whitehousea2457692012-01-20 10:38:36 +000034#include <linux/percpu.h>
Steven Whitehouse4506a512013-02-01 20:36:03 +000035#include <linux/list_sort.h>
Steven Whitehousee66cf162013-10-15 15:18:08 +010036#include <linux/lockref.h>
Bob Peterson88ffbf32015-03-16 11:02:46 -050037#include <linux/rhashtable.h>
David Teiglandb3b94fa2006-01-16 16:50:04 +000038
39#include "gfs2.h"
Steven Whitehouse5c676f62006-02-27 17:23:27 -050040#include "incore.h"
David Teiglandb3b94fa2006-01-16 16:50:04 +000041#include "glock.h"
42#include "glops.h"
43#include "inode.h"
David Teiglandb3b94fa2006-01-16 16:50:04 +000044#include "lops.h"
45#include "meta_io.h"
46#include "quota.h"
47#include "super.h"
Steven Whitehouse5c676f62006-02-27 17:23:27 -050048#include "util.h"
Steven Whitehouse813e0c42008-11-18 13:38:48 +000049#include "bmap.h"
Steven Whitehouse63997772009-06-12 08:49:20 +010050#define CREATE_TRACE_POINTS
51#include "trace_gfs2.h"
David Teiglandb3b94fa2006-01-16 16:50:04 +000052
Steven Whitehouse6802e342008-05-21 17:03:22 +010053struct gfs2_glock_iter {
Steven Whitehouseba1ddcb2012-06-08 11:16:22 +010054 struct gfs2_sbd *sdp; /* incore superblock */
Bob Peterson88ffbf32015-03-16 11:02:46 -050055 struct rhashtable_iter hti; /* rhashtable iterator */
Steven Whitehouseba1ddcb2012-06-08 11:16:22 +010056 struct gfs2_glock *gl; /* current glock struct */
57 loff_t last_pos; /* last position */
Robert Peterson7c52b162007-03-16 10:26:37 +000058};
59
David Teiglandb3b94fa2006-01-16 16:50:04 +000060typedef void (*glock_examiner) (struct gfs2_glock * gl);
61
Steven Whitehouse6802e342008-05-21 17:03:22 +010062static void do_xmote(struct gfs2_glock *gl, struct gfs2_holder *gh, unsigned int target);
Benjamin Marzinskic4f68a12007-08-23 13:19:05 -050063
Robert Peterson7c52b162007-03-16 10:26:37 +000064static struct dentry *gfs2_root;
Benjamin Marzinskic4f68a12007-08-23 13:19:05 -050065static struct workqueue_struct *glock_workqueue;
Benjamin Marzinskib94a1702009-07-23 18:52:34 -050066struct workqueue_struct *gfs2_delete_workqueue;
Steven Whitehouse97cc1022008-11-20 13:39:47 +000067static LIST_HEAD(lru_list);
68static atomic_t lru_count = ATOMIC_INIT(0);
Julia Lawalleb8374e2008-12-25 15:35:27 +010069static DEFINE_SPINLOCK(lru_lock);
Adrian Bunk08bc2db2006-04-28 10:59:12 -040070
Steven Whitehouseb6397892006-09-12 10:10:01 -040071#define GFS2_GL_HASH_SHIFT 15
Steven Whitehouse087efdd2006-09-09 16:59:11 -040072#define GFS2_GL_HASH_SIZE (1 << GFS2_GL_HASH_SHIFT)
Steven Whitehouse087efdd2006-09-09 16:59:11 -040073
Bob Peterson88ffbf32015-03-16 11:02:46 -050074static struct rhashtable_params ht_parms = {
75 .nelem_hint = GFS2_GL_HASH_SIZE * 3 / 4,
76 .key_len = sizeof(struct lm_lockname),
77 .key_offset = offsetof(struct gfs2_glock, gl_name),
78 .head_offset = offsetof(struct gfs2_glock, gl_node),
79};
Steven Whitehouse087efdd2006-09-09 16:59:11 -040080
Bob Peterson88ffbf32015-03-16 11:02:46 -050081static struct rhashtable gl_hash_table;
David Teiglandb3b94fa2006-01-16 16:50:04 +000082
Bob Peterson88ffbf32015-03-16 11:02:46 -050083void gfs2_glock_free(struct gfs2_glock *gl)
David Teiglandb3b94fa2006-01-16 16:50:04 +000084{
Bob Peterson88ffbf32015-03-16 11:02:46 -050085 struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
Steven Whitehousebc015cb2011-01-19 09:30:01 +000086
David Teiglanddba2d702012-11-14 13:46:53 -050087 if (gl->gl_ops->go_flags & GLOF_ASPACE) {
Steven Whitehousebc015cb2011-01-19 09:30:01 +000088 kmem_cache_free(gfs2_glock_aspace_cachep, gl);
David Teiglanddba2d702012-11-14 13:46:53 -050089 } else {
David Teigland4e2f8842012-11-14 13:47:37 -050090 kfree(gl->gl_lksb.sb_lvbptr);
Steven Whitehousebc015cb2011-01-19 09:30:01 +000091 kmem_cache_free(gfs2_glock_cachep, gl);
David Teiglanddba2d702012-11-14 13:46:53 -050092 }
Steven Whitehousebc015cb2011-01-19 09:30:01 +000093 if (atomic_dec_and_test(&sdp->sd_glock_disposal))
94 wake_up(&sdp->sd_glock_wait);
David Teiglandb3b94fa2006-01-16 16:50:04 +000095}
96
97/**
98 * gfs2_glock_hold() - increment reference count on glock
99 * @gl: The glock to hold
100 *
101 */
102
Steven Whitehousee66cf162013-10-15 15:18:08 +0100103static void gfs2_glock_hold(struct gfs2_glock *gl)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000104{
Steven Whitehousee66cf162013-10-15 15:18:08 +0100105 GLOCK_BUG_ON(gl, __lockref_is_dead(&gl->gl_lockref));
106 lockref_get(&gl->gl_lockref);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000107}
108
109/**
Benjamin Marzinski8ff22a62009-07-10 18:04:24 -0500110 * demote_ok - Check to see if it's ok to unlock a glock
111 * @gl: the glock
112 *
113 * Returns: 1 if it's ok
114 */
115
116static int demote_ok(const struct gfs2_glock *gl)
117{
118 const struct gfs2_glock_operations *glops = gl->gl_ops;
119
120 if (gl->gl_state == LM_ST_UNLOCKED)
121 return 0;
Steven Whitehousef42ab082011-04-14 16:50:31 +0100122 if (!list_empty(&gl->gl_holders))
Benjamin Marzinski8ff22a62009-07-10 18:04:24 -0500123 return 0;
124 if (glops->go_demote_ok)
125 return glops->go_demote_ok(gl);
126 return 1;
127}
128
Steven Whitehousebc015cb2011-01-19 09:30:01 +0000129
Steven Whitehouse29687a22011-03-30 16:33:25 +0100130void gfs2_glock_add_to_lru(struct gfs2_glock *gl)
131{
132 spin_lock(&lru_lock);
133
134 if (!list_empty(&gl->gl_lru))
135 list_del_init(&gl->gl_lru);
136 else
137 atomic_inc(&lru_count);
138
139 list_add_tail(&gl->gl_lru, &lru_list);
Steven Whitehouse627c10b2011-04-14 14:09:52 +0100140 set_bit(GLF_LRU, &gl->gl_flags);
Steven Whitehouse29687a22011-03-30 16:33:25 +0100141 spin_unlock(&lru_lock);
142}
143
Bob Peterson8f6cb402015-01-05 13:25:10 -0500144static void gfs2_glock_remove_from_lru(struct gfs2_glock *gl)
Steven Whitehousef42ab082011-04-14 16:50:31 +0100145{
Bob Peterson8f6cb402015-01-05 13:25:10 -0500146 spin_lock(&lru_lock);
Steven Whitehousef42ab082011-04-14 16:50:31 +0100147 if (!list_empty(&gl->gl_lru)) {
148 list_del_init(&gl->gl_lru);
149 atomic_dec(&lru_count);
150 clear_bit(GLF_LRU, &gl->gl_flags);
151 }
152 spin_unlock(&lru_lock);
153}
154
Benjamin Marzinski8ff22a62009-07-10 18:04:24 -0500155/**
David Teiglandb3b94fa2006-01-16 16:50:04 +0000156 * gfs2_glock_put() - Decrement reference count on glock
157 * @gl: The glock to put
158 *
159 */
160
Steven Whitehousebc015cb2011-01-19 09:30:01 +0000161void gfs2_glock_put(struct gfs2_glock *gl)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000162{
Bob Peterson15562c42015-03-16 11:52:05 -0500163 struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
Steven Whitehousebc015cb2011-01-19 09:30:01 +0000164 struct address_space *mapping = gfs2_glock2aspace(gl);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000165
Steven Whitehousee66cf162013-10-15 15:18:08 +0100166 if (lockref_put_or_lock(&gl->gl_lockref))
167 return;
168
169 lockref_mark_dead(&gl->gl_lockref);
170
Bob Peterson8f6cb402015-01-05 13:25:10 -0500171 gfs2_glock_remove_from_lru(gl);
Steven Whitehousee66cf162013-10-15 15:18:08 +0100172 spin_unlock(&gl->gl_lockref.lock);
Bob Peterson88ffbf32015-03-16 11:02:46 -0500173 rhashtable_remove_fast(&gl_hash_table, &gl->gl_node, ht_parms);
Steven Whitehousee66cf162013-10-15 15:18:08 +0100174 GLOCK_BUG_ON(gl, !list_empty(&gl->gl_holders));
175 GLOCK_BUG_ON(gl, mapping && mapping->nrpages);
176 trace_gfs2_glock_put(gl);
177 sdp->sd_lockstruct.ls_ops->lm_put_lock(gl);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000178}
179
180/**
Steven Whitehouse6802e342008-05-21 17:03:22 +0100181 * may_grant - check if its ok to grant a new lock
182 * @gl: The glock
183 * @gh: The lock request which we wish to grant
184 *
185 * Returns: true if its ok to grant the lock
186 */
187
188static inline int may_grant(const struct gfs2_glock *gl, const struct gfs2_holder *gh)
Benjamin Marzinskic4f68a12007-08-23 13:19:05 -0500189{
Steven Whitehouse6802e342008-05-21 17:03:22 +0100190 const struct gfs2_holder *gh_head = list_entry(gl->gl_holders.next, const struct gfs2_holder, gh_list);
191 if ((gh->gh_state == LM_ST_EXCLUSIVE ||
192 gh_head->gh_state == LM_ST_EXCLUSIVE) && gh != gh_head)
193 return 0;
194 if (gl->gl_state == gh->gh_state)
195 return 1;
196 if (gh->gh_flags & GL_EXACT)
197 return 0;
Steven Whitehouse209806a2008-07-07 10:07:28 +0100198 if (gl->gl_state == LM_ST_EXCLUSIVE) {
199 if (gh->gh_state == LM_ST_SHARED && gh_head->gh_state == LM_ST_SHARED)
200 return 1;
201 if (gh->gh_state == LM_ST_DEFERRED && gh_head->gh_state == LM_ST_DEFERRED)
202 return 1;
203 }
Steven Whitehouse6802e342008-05-21 17:03:22 +0100204 if (gl->gl_state != LM_ST_UNLOCKED && (gh->gh_flags & LM_FLAG_ANY))
205 return 1;
206 return 0;
207}
208
209static void gfs2_holder_wake(struct gfs2_holder *gh)
210{
211 clear_bit(HIF_WAIT, &gh->gh_iflags);
Peter Zijlstra4e857c52014-03-17 18:06:10 +0100212 smp_mb__after_atomic();
Steven Whitehouse6802e342008-05-21 17:03:22 +0100213 wake_up_bit(&gh->gh_iflags, HIF_WAIT);
214}
215
216/**
Steven Whitehoused5341a92010-07-23 14:05:51 +0100217 * do_error - Something unexpected has happened during a lock request
218 *
219 */
220
221static inline void do_error(struct gfs2_glock *gl, const int ret)
222{
223 struct gfs2_holder *gh, *tmp;
224
225 list_for_each_entry_safe(gh, tmp, &gl->gl_holders, gh_list) {
226 if (test_bit(HIF_HOLDER, &gh->gh_iflags))
227 continue;
228 if (ret & LM_OUT_ERROR)
229 gh->gh_error = -EIO;
230 else if (gh->gh_flags & (LM_FLAG_TRY | LM_FLAG_TRY_1CB))
231 gh->gh_error = GLR_TRYFAILED;
232 else
233 continue;
234 list_del_init(&gh->gh_list);
235 trace_gfs2_glock_queue(gh, 0);
236 gfs2_holder_wake(gh);
237 }
238}
239
240/**
Steven Whitehouse6802e342008-05-21 17:03:22 +0100241 * do_promote - promote as many requests as possible on the current queue
242 * @gl: The glock
243 *
Steven Whitehouse813e0c42008-11-18 13:38:48 +0000244 * Returns: 1 if there is a blocked holder at the head of the list, or 2
245 * if a type specific operation is underway.
Steven Whitehouse6802e342008-05-21 17:03:22 +0100246 */
247
248static int do_promote(struct gfs2_glock *gl)
Andreas Gruenbacherf3dd1642015-10-29 10:58:09 -0500249__releases(&gl->gl_lockref.lock)
250__acquires(&gl->gl_lockref.lock)
Steven Whitehouse6802e342008-05-21 17:03:22 +0100251{
252 const struct gfs2_glock_operations *glops = gl->gl_ops;
253 struct gfs2_holder *gh, *tmp;
254 int ret;
255
256restart:
257 list_for_each_entry_safe(gh, tmp, &gl->gl_holders, gh_list) {
258 if (test_bit(HIF_HOLDER, &gh->gh_iflags))
259 continue;
260 if (may_grant(gl, gh)) {
261 if (gh->gh_list.prev == &gl->gl_holders &&
262 glops->go_lock) {
Andreas Gruenbacherf3dd1642015-10-29 10:58:09 -0500263 spin_unlock(&gl->gl_lockref.lock);
Steven Whitehouse6802e342008-05-21 17:03:22 +0100264 /* FIXME: eliminate this eventually */
265 ret = glops->go_lock(gh);
Andreas Gruenbacherf3dd1642015-10-29 10:58:09 -0500266 spin_lock(&gl->gl_lockref.lock);
Steven Whitehouse6802e342008-05-21 17:03:22 +0100267 if (ret) {
Steven Whitehouse813e0c42008-11-18 13:38:48 +0000268 if (ret == 1)
269 return 2;
Steven Whitehouse6802e342008-05-21 17:03:22 +0100270 gh->gh_error = ret;
271 list_del_init(&gh->gh_list);
Steven Whitehouse63997772009-06-12 08:49:20 +0100272 trace_gfs2_glock_queue(gh, 0);
Steven Whitehouse6802e342008-05-21 17:03:22 +0100273 gfs2_holder_wake(gh);
274 goto restart;
275 }
276 set_bit(HIF_HOLDER, &gh->gh_iflags);
Steven Whitehouse63997772009-06-12 08:49:20 +0100277 trace_gfs2_promote(gh, 1);
Steven Whitehouse6802e342008-05-21 17:03:22 +0100278 gfs2_holder_wake(gh);
279 goto restart;
280 }
281 set_bit(HIF_HOLDER, &gh->gh_iflags);
Steven Whitehouse63997772009-06-12 08:49:20 +0100282 trace_gfs2_promote(gh, 0);
Steven Whitehouse6802e342008-05-21 17:03:22 +0100283 gfs2_holder_wake(gh);
284 continue;
285 }
286 if (gh->gh_list.prev == &gl->gl_holders)
287 return 1;
Steven Whitehoused5341a92010-07-23 14:05:51 +0100288 do_error(gl, 0);
Steven Whitehouse6802e342008-05-21 17:03:22 +0100289 break;
290 }
291 return 0;
292}
293
294/**
Steven Whitehouse6802e342008-05-21 17:03:22 +0100295 * find_first_waiter - find the first gh that's waiting for the glock
296 * @gl: the glock
297 */
298
299static inline struct gfs2_holder *find_first_waiter(const struct gfs2_glock *gl)
300{
301 struct gfs2_holder *gh;
302
303 list_for_each_entry(gh, &gl->gl_holders, gh_list) {
304 if (!test_bit(HIF_HOLDER, &gh->gh_iflags))
305 return gh;
306 }
307 return NULL;
308}
309
310/**
311 * state_change - record that the glock is now in a different state
312 * @gl: the glock
313 * @new_state the new state
314 *
315 */
316
317static void state_change(struct gfs2_glock *gl, unsigned int new_state)
318{
319 int held1, held2;
320
321 held1 = (gl->gl_state != LM_ST_UNLOCKED);
322 held2 = (new_state != LM_ST_UNLOCKED);
323
324 if (held1 != held2) {
Steven Whitehousee66cf162013-10-15 15:18:08 +0100325 GLOCK_BUG_ON(gl, __lockref_is_dead(&gl->gl_lockref));
Steven Whitehouse6802e342008-05-21 17:03:22 +0100326 if (held2)
Steven Whitehousee66cf162013-10-15 15:18:08 +0100327 gl->gl_lockref.count++;
Steven Whitehouse6802e342008-05-21 17:03:22 +0100328 else
Steven Whitehousee66cf162013-10-15 15:18:08 +0100329 gl->gl_lockref.count--;
Steven Whitehouse6802e342008-05-21 17:03:22 +0100330 }
Steven Whitehouse7b5e3d52010-09-03 09:39:20 +0100331 if (held1 && held2 && list_empty(&gl->gl_holders))
332 clear_bit(GLF_QUEUED, &gl->gl_flags);
Steven Whitehouse6802e342008-05-21 17:03:22 +0100333
Bob Peterson7cf8dcd2011-06-15 11:41:48 -0400334 if (new_state != gl->gl_target)
335 /* shorten our minimum hold time */
336 gl->gl_hold_time = max(gl->gl_hold_time - GL_GLOCK_HOLD_DECR,
337 GL_GLOCK_MIN_HOLD);
Steven Whitehouse6802e342008-05-21 17:03:22 +0100338 gl->gl_state = new_state;
339 gl->gl_tchange = jiffies;
340}
341
342static void gfs2_demote_wake(struct gfs2_glock *gl)
343{
344 gl->gl_demote_state = LM_ST_EXCLUSIVE;
345 clear_bit(GLF_DEMOTE, &gl->gl_flags);
Peter Zijlstra4e857c52014-03-17 18:06:10 +0100346 smp_mb__after_atomic();
Steven Whitehouse6802e342008-05-21 17:03:22 +0100347 wake_up_bit(&gl->gl_flags, GLF_DEMOTE);
348}
349
350/**
351 * finish_xmote - The DLM has replied to one of our lock requests
352 * @gl: The glock
353 * @ret: The status from the DLM
354 *
355 */
356
357static void finish_xmote(struct gfs2_glock *gl, unsigned int ret)
358{
359 const struct gfs2_glock_operations *glops = gl->gl_ops;
360 struct gfs2_holder *gh;
361 unsigned state = ret & LM_OUT_ST_MASK;
Steven Whitehouse813e0c42008-11-18 13:38:48 +0000362 int rv;
Benjamin Marzinskic4f68a12007-08-23 13:19:05 -0500363
Andreas Gruenbacherf3dd1642015-10-29 10:58:09 -0500364 spin_lock(&gl->gl_lockref.lock);
Steven Whitehouse63997772009-06-12 08:49:20 +0100365 trace_gfs2_glock_state_change(gl, state);
Steven Whitehouse6802e342008-05-21 17:03:22 +0100366 state_change(gl, state);
367 gh = find_first_waiter(gl);
368
369 /* Demote to UN request arrived during demote to SH or DF */
370 if (test_bit(GLF_DEMOTE_IN_PROGRESS, &gl->gl_flags) &&
371 state != LM_ST_UNLOCKED && gl->gl_demote_state == LM_ST_UNLOCKED)
372 gl->gl_target = LM_ST_UNLOCKED;
373
374 /* Check for state != intended state */
375 if (unlikely(state != gl->gl_target)) {
376 if (gh && !test_bit(GLF_DEMOTE_IN_PROGRESS, &gl->gl_flags)) {
377 /* move to back of queue and try next entry */
378 if (ret & LM_OUT_CANCELED) {
379 if ((gh->gh_flags & LM_FLAG_PRIORITY) == 0)
380 list_move_tail(&gh->gh_list, &gl->gl_holders);
381 gh = find_first_waiter(gl);
382 gl->gl_target = gh->gh_state;
383 goto retry;
384 }
385 /* Some error or failed "try lock" - report it */
386 if ((ret & LM_OUT_ERROR) ||
387 (gh->gh_flags & (LM_FLAG_TRY | LM_FLAG_TRY_1CB))) {
388 gl->gl_target = gl->gl_state;
389 do_error(gl, ret);
390 goto out;
391 }
392 }
393 switch(state) {
394 /* Unlocked due to conversion deadlock, try again */
395 case LM_ST_UNLOCKED:
396retry:
397 do_xmote(gl, gh, gl->gl_target);
398 break;
399 /* Conversion fails, unlock and try again */
400 case LM_ST_SHARED:
401 case LM_ST_DEFERRED:
402 do_xmote(gl, gh, LM_ST_UNLOCKED);
403 break;
404 default: /* Everything else */
Joe Perchesd77d1b52014-03-06 12:10:45 -0800405 pr_err("wanted %u got %u\n", gl->gl_target, state);
Steven Whitehouse6802e342008-05-21 17:03:22 +0100406 GLOCK_BUG_ON(gl, 1);
407 }
Andreas Gruenbacherf3dd1642015-10-29 10:58:09 -0500408 spin_unlock(&gl->gl_lockref.lock);
Steven Whitehouse6802e342008-05-21 17:03:22 +0100409 return;
410 }
411
412 /* Fast path - we got what we asked for */
413 if (test_and_clear_bit(GLF_DEMOTE_IN_PROGRESS, &gl->gl_flags))
414 gfs2_demote_wake(gl);
415 if (state != LM_ST_UNLOCKED) {
416 if (glops->go_xmote_bh) {
Andreas Gruenbacherf3dd1642015-10-29 10:58:09 -0500417 spin_unlock(&gl->gl_lockref.lock);
Steven Whitehouse6802e342008-05-21 17:03:22 +0100418 rv = glops->go_xmote_bh(gl, gh);
Andreas Gruenbacherf3dd1642015-10-29 10:58:09 -0500419 spin_lock(&gl->gl_lockref.lock);
Steven Whitehouse6802e342008-05-21 17:03:22 +0100420 if (rv) {
421 do_error(gl, rv);
422 goto out;
423 }
424 }
Steven Whitehouse813e0c42008-11-18 13:38:48 +0000425 rv = do_promote(gl);
426 if (rv == 2)
427 goto out_locked;
Steven Whitehouse6802e342008-05-21 17:03:22 +0100428 }
429out:
430 clear_bit(GLF_LOCK, &gl->gl_flags);
Steven Whitehouse813e0c42008-11-18 13:38:48 +0000431out_locked:
Andreas Gruenbacherf3dd1642015-10-29 10:58:09 -0500432 spin_unlock(&gl->gl_lockref.lock);
Benjamin Marzinskic4f68a12007-08-23 13:19:05 -0500433}
434
Steven Whitehouse6802e342008-05-21 17:03:22 +0100435/**
436 * do_xmote - Calls the DLM to change the state of a lock
437 * @gl: The lock state
438 * @gh: The holder (only for promotes)
439 * @target: The target lock state
440 *
441 */
442
443static void do_xmote(struct gfs2_glock *gl, struct gfs2_holder *gh, unsigned int target)
Andreas Gruenbacherf3dd1642015-10-29 10:58:09 -0500444__releases(&gl->gl_lockref.lock)
445__acquires(&gl->gl_lockref.lock)
Steven Whitehouse6802e342008-05-21 17:03:22 +0100446{
447 const struct gfs2_glock_operations *glops = gl->gl_ops;
Bob Peterson15562c42015-03-16 11:52:05 -0500448 struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
Bob Petersonb58bf402015-07-24 09:45:43 -0500449 unsigned int lck_flags = (unsigned int)(gh ? gh->gh_flags : 0);
Steven Whitehouse6802e342008-05-21 17:03:22 +0100450 int ret;
451
452 lck_flags &= (LM_FLAG_TRY | LM_FLAG_TRY_1CB | LM_FLAG_NOEXP |
453 LM_FLAG_PRIORITY);
Steven Whitehouse921169c2010-11-29 12:50:38 +0000454 GLOCK_BUG_ON(gl, gl->gl_state == target);
455 GLOCK_BUG_ON(gl, gl->gl_state == gl->gl_target);
Steven Whitehouse6802e342008-05-21 17:03:22 +0100456 if ((target == LM_ST_UNLOCKED || target == LM_ST_DEFERRED) &&
457 glops->go_inval) {
458 set_bit(GLF_INVALIDATE_IN_PROGRESS, &gl->gl_flags);
459 do_error(gl, 0); /* Fail queued try locks */
460 }
Steven Whitehouse47a25382010-11-30 15:49:31 +0000461 gl->gl_req = target;
Steven Whitehousea2457692012-01-20 10:38:36 +0000462 set_bit(GLF_BLOCKING, &gl->gl_flags);
463 if ((gl->gl_req == LM_ST_UNLOCKED) ||
464 (gl->gl_state == LM_ST_EXCLUSIVE) ||
465 (lck_flags & (LM_FLAG_TRY|LM_FLAG_TRY_1CB)))
466 clear_bit(GLF_BLOCKING, &gl->gl_flags);
Andreas Gruenbacherf3dd1642015-10-29 10:58:09 -0500467 spin_unlock(&gl->gl_lockref.lock);
Bob Peterson06dfc302012-10-24 14:41:05 -0400468 if (glops->go_sync)
469 glops->go_sync(gl);
Steven Whitehouse6802e342008-05-21 17:03:22 +0100470 if (test_bit(GLF_INVALIDATE_IN_PROGRESS, &gl->gl_flags))
471 glops->go_inval(gl, target == LM_ST_DEFERRED ? 0 : DIO_METADATA);
472 clear_bit(GLF_INVALIDATE_IN_PROGRESS, &gl->gl_flags);
473
474 gfs2_glock_hold(gl);
Steven Whitehouse921169c2010-11-29 12:50:38 +0000475 if (sdp->sd_lockstruct.ls_ops->lm_lock) {
476 /* lock_dlm */
477 ret = sdp->sd_lockstruct.ls_ops->lm_lock(gl, target, lck_flags);
David Teiglanddba2d702012-11-14 13:46:53 -0500478 if (ret) {
Joe Perchesd77d1b52014-03-06 12:10:45 -0800479 pr_err("lm_lock ret %d\n", ret);
David Teiglanddba2d702012-11-14 13:46:53 -0500480 GLOCK_BUG_ON(gl, 1);
481 }
Steven Whitehouse921169c2010-11-29 12:50:38 +0000482 } else { /* lock_nolock */
483 finish_xmote(gl, target);
Steven Whitehouse6802e342008-05-21 17:03:22 +0100484 if (queue_delayed_work(glock_workqueue, &gl->gl_work, 0) == 0)
485 gfs2_glock_put(gl);
Steven Whitehouse6802e342008-05-21 17:03:22 +0100486 }
Steven Whitehouse921169c2010-11-29 12:50:38 +0000487
Andreas Gruenbacherf3dd1642015-10-29 10:58:09 -0500488 spin_lock(&gl->gl_lockref.lock);
Steven Whitehouse6802e342008-05-21 17:03:22 +0100489}
490
491/**
492 * find_first_holder - find the first "holder" gh
493 * @gl: the glock
494 */
495
496static inline struct gfs2_holder *find_first_holder(const struct gfs2_glock *gl)
497{
498 struct gfs2_holder *gh;
499
500 if (!list_empty(&gl->gl_holders)) {
501 gh = list_entry(gl->gl_holders.next, struct gfs2_holder, gh_list);
502 if (test_bit(HIF_HOLDER, &gh->gh_iflags))
503 return gh;
504 }
505 return NULL;
506}
507
508/**
509 * run_queue - do all outstanding tasks related to a glock
510 * @gl: The glock in question
511 * @nonblock: True if we must not block in run_queue
512 *
513 */
514
515static void run_queue(struct gfs2_glock *gl, const int nonblock)
Andreas Gruenbacherf3dd1642015-10-29 10:58:09 -0500516__releases(&gl->gl_lockref.lock)
517__acquires(&gl->gl_lockref.lock)
Steven Whitehouse6802e342008-05-21 17:03:22 +0100518{
519 struct gfs2_holder *gh = NULL;
Steven Whitehouse813e0c42008-11-18 13:38:48 +0000520 int ret;
Steven Whitehouse6802e342008-05-21 17:03:22 +0100521
522 if (test_and_set_bit(GLF_LOCK, &gl->gl_flags))
523 return;
524
525 GLOCK_BUG_ON(gl, test_bit(GLF_DEMOTE_IN_PROGRESS, &gl->gl_flags));
526
527 if (test_bit(GLF_DEMOTE, &gl->gl_flags) &&
528 gl->gl_demote_state != gl->gl_state) {
529 if (find_first_holder(gl))
Steven Whitehoused8348de2009-02-05 10:12:38 +0000530 goto out_unlock;
Steven Whitehouse6802e342008-05-21 17:03:22 +0100531 if (nonblock)
532 goto out_sched;
533 set_bit(GLF_DEMOTE_IN_PROGRESS, &gl->gl_flags);
Steven Whitehouse265d529c2008-07-07 10:02:36 +0100534 GLOCK_BUG_ON(gl, gl->gl_demote_state == LM_ST_EXCLUSIVE);
Steven Whitehouse6802e342008-05-21 17:03:22 +0100535 gl->gl_target = gl->gl_demote_state;
536 } else {
537 if (test_bit(GLF_DEMOTE, &gl->gl_flags))
538 gfs2_demote_wake(gl);
Steven Whitehouse813e0c42008-11-18 13:38:48 +0000539 ret = do_promote(gl);
540 if (ret == 0)
Steven Whitehoused8348de2009-02-05 10:12:38 +0000541 goto out_unlock;
Steven Whitehouse813e0c42008-11-18 13:38:48 +0000542 if (ret == 2)
Steven Whitehousea228df62009-04-07 14:01:34 +0100543 goto out;
Steven Whitehouse6802e342008-05-21 17:03:22 +0100544 gh = find_first_waiter(gl);
545 gl->gl_target = gh->gh_state;
546 if (!(gh->gh_flags & (LM_FLAG_TRY | LM_FLAG_TRY_1CB)))
547 do_error(gl, 0); /* Fail queued try locks */
548 }
549 do_xmote(gl, gh, gl->gl_target);
Steven Whitehousea228df62009-04-07 14:01:34 +0100550out:
Steven Whitehouse6802e342008-05-21 17:03:22 +0100551 return;
552
553out_sched:
Steven Whitehouse7e71c552009-09-22 10:56:16 +0100554 clear_bit(GLF_LOCK, &gl->gl_flags);
Peter Zijlstra4e857c52014-03-17 18:06:10 +0100555 smp_mb__after_atomic();
Steven Whitehousee66cf162013-10-15 15:18:08 +0100556 gl->gl_lockref.count++;
Steven Whitehouse6802e342008-05-21 17:03:22 +0100557 if (queue_delayed_work(glock_workqueue, &gl->gl_work, 0) == 0)
Steven Whitehousee66cf162013-10-15 15:18:08 +0100558 gl->gl_lockref.count--;
Steven Whitehouse7e71c552009-09-22 10:56:16 +0100559 return;
560
Steven Whitehoused8348de2009-02-05 10:12:38 +0000561out_unlock:
Steven Whitehouse6802e342008-05-21 17:03:22 +0100562 clear_bit(GLF_LOCK, &gl->gl_flags);
Peter Zijlstra4e857c52014-03-17 18:06:10 +0100563 smp_mb__after_atomic();
Steven Whitehouse7e71c552009-09-22 10:56:16 +0100564 return;
Steven Whitehouse6802e342008-05-21 17:03:22 +0100565}
566
Benjamin Marzinskib94a1702009-07-23 18:52:34 -0500567static void delete_work_func(struct work_struct *work)
568{
569 struct gfs2_glock *gl = container_of(work, struct gfs2_glock, gl_delete);
Bob Peterson15562c42015-03-16 11:52:05 -0500570 struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
Steven Whitehouse044b9412010-11-03 20:01:07 +0000571 struct gfs2_inode *ip;
Benjamin Marzinskib94a1702009-07-23 18:52:34 -0500572 struct inode *inode;
Steven Whitehouse044b9412010-11-03 20:01:07 +0000573 u64 no_addr = gl->gl_name.ln_number;
Benjamin Marzinskib94a1702009-07-23 18:52:34 -0500574
Steven Whitehouse044b9412010-11-03 20:01:07 +0000575 ip = gl->gl_object;
576 /* Note: Unsafe to dereference ip as we don't hold right refs/locks */
577
Benjamin Marzinskib94a1702009-07-23 18:52:34 -0500578 if (ip)
Steven Whitehouse4667a0e2011-04-18 14:18:09 +0100579 inode = gfs2_ilookup(sdp->sd_vfs, no_addr, 1);
Steven Whitehouse044b9412010-11-03 20:01:07 +0000580 else
581 inode = gfs2_lookup_by_inum(sdp, no_addr, NULL, GFS2_BLKST_UNLINKED);
582 if (inode && !IS_ERR(inode)) {
583 d_prune_aliases(inode);
584 iput(inode);
Benjamin Marzinskib94a1702009-07-23 18:52:34 -0500585 }
586 gfs2_glock_put(gl);
587}
588
Steven Whitehouse6802e342008-05-21 17:03:22 +0100589static void glock_work_func(struct work_struct *work)
590{
591 unsigned long delay = 0;
592 struct gfs2_glock *gl = container_of(work, struct gfs2_glock, gl_work.work);
Steven Whitehouse26bb7502009-11-27 10:31:11 +0000593 int drop_ref = 0;
Steven Whitehouse6802e342008-05-21 17:03:22 +0100594
Steven Whitehouse26bb7502009-11-27 10:31:11 +0000595 if (test_and_clear_bit(GLF_REPLY_PENDING, &gl->gl_flags)) {
Steven Whitehouse6802e342008-05-21 17:03:22 +0100596 finish_xmote(gl, gl->gl_reply);
Steven Whitehouse26bb7502009-11-27 10:31:11 +0000597 drop_ref = 1;
598 }
Andreas Gruenbacherf3dd1642015-10-29 10:58:09 -0500599 spin_lock(&gl->gl_lockref.lock);
Bob Petersonf90e5b52011-05-24 10:44:42 -0400600 if (test_bit(GLF_PENDING_DEMOTE, &gl->gl_flags) &&
Steven Whitehouse265d529c2008-07-07 10:02:36 +0100601 gl->gl_state != LM_ST_UNLOCKED &&
602 gl->gl_demote_state != LM_ST_EXCLUSIVE) {
Steven Whitehouse6802e342008-05-21 17:03:22 +0100603 unsigned long holdtime, now = jiffies;
Bob Petersonf90e5b52011-05-24 10:44:42 -0400604
Bob Peterson7cf8dcd2011-06-15 11:41:48 -0400605 holdtime = gl->gl_tchange + gl->gl_hold_time;
Steven Whitehouse6802e342008-05-21 17:03:22 +0100606 if (time_before(now, holdtime))
607 delay = holdtime - now;
Bob Petersonf90e5b52011-05-24 10:44:42 -0400608
609 if (!delay) {
610 clear_bit(GLF_PENDING_DEMOTE, &gl->gl_flags);
611 set_bit(GLF_DEMOTE, &gl->gl_flags);
612 }
Steven Whitehouse6802e342008-05-21 17:03:22 +0100613 }
614 run_queue(gl, 0);
Andreas Gruenbacherf3dd1642015-10-29 10:58:09 -0500615 spin_unlock(&gl->gl_lockref.lock);
Bob Peterson7cf8dcd2011-06-15 11:41:48 -0400616 if (!delay)
Steven Whitehouse6802e342008-05-21 17:03:22 +0100617 gfs2_glock_put(gl);
Bob Peterson7cf8dcd2011-06-15 11:41:48 -0400618 else {
619 if (gl->gl_name.ln_type != LM_TYPE_INODE)
620 delay = 0;
621 if (queue_delayed_work(glock_workqueue, &gl->gl_work, delay) == 0)
622 gfs2_glock_put(gl);
623 }
Steven Whitehouse26bb7502009-11-27 10:31:11 +0000624 if (drop_ref)
625 gfs2_glock_put(gl);
Steven Whitehouse6802e342008-05-21 17:03:22 +0100626}
627
David Teiglandb3b94fa2006-01-16 16:50:04 +0000628/**
629 * gfs2_glock_get() - Get a glock, or create one if one doesn't exist
630 * @sdp: The GFS2 superblock
631 * @number: the lock number
632 * @glops: The glock_operations to use
633 * @create: If 0, don't create the glock if it doesn't exist
634 * @glp: the glock is returned here
635 *
636 * This does not lock a glock, just finds/creates structures for one.
637 *
638 * Returns: errno
639 */
640
Steven Whitehousecd915492006-09-04 12:49:07 -0400641int gfs2_glock_get(struct gfs2_sbd *sdp, u64 number,
Steven Whitehouse8fb4b532006-08-30 09:30:00 -0400642 const struct gfs2_glock_operations *glops, int create,
David Teiglandb3b94fa2006-01-16 16:50:04 +0000643 struct gfs2_glock **glp)
644{
Steven Whitehouse009d8512009-12-08 12:12:13 +0000645 struct super_block *s = sdp->sd_vfs;
Bob Peterson15562c42015-03-16 11:52:05 -0500646 struct lm_lockname name = { .ln_number = number,
647 .ln_type = glops->go_type,
648 .ln_sbd = sdp };
Bob Peterson88ffbf32015-03-16 11:02:46 -0500649 struct gfs2_glock *gl, *tmp = NULL;
Steven Whitehouse009d8512009-12-08 12:12:13 +0000650 struct address_space *mapping;
Steven Whitehousebc015cb2011-01-19 09:30:01 +0000651 struct kmem_cache *cachep;
Bob Peterson88ffbf32015-03-16 11:02:46 -0500652 int ret, tries = 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000653
Bob Peterson88ffbf32015-03-16 11:02:46 -0500654 gl = rhashtable_lookup_fast(&gl_hash_table, &name, ht_parms);
655 if (gl && !lockref_get_not_dead(&gl->gl_lockref))
656 gl = NULL;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000657
Steven Whitehouse64d576b2009-02-12 13:31:58 +0000658 *glp = gl;
659 if (gl)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000660 return 0;
Steven Whitehouse64d576b2009-02-12 13:31:58 +0000661 if (!create)
662 return -ENOENT;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000663
Steven Whitehouse009d8512009-12-08 12:12:13 +0000664 if (glops->go_flags & GLOF_ASPACE)
Steven Whitehousebc015cb2011-01-19 09:30:01 +0000665 cachep = gfs2_glock_aspace_cachep;
Steven Whitehouse009d8512009-12-08 12:12:13 +0000666 else
Steven Whitehousebc015cb2011-01-19 09:30:01 +0000667 cachep = gfs2_glock_cachep;
Steven Whitehousefe0bbd22014-06-23 14:50:20 +0100668 gl = kmem_cache_alloc(cachep, GFP_NOFS);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000669 if (!gl)
670 return -ENOMEM;
671
David Teiglanddba2d702012-11-14 13:46:53 -0500672 memset(&gl->gl_lksb, 0, sizeof(struct dlm_lksb));
David Teiglanddba2d702012-11-14 13:46:53 -0500673
674 if (glops->go_flags & GLOF_LVB) {
Steven Whitehousefe0bbd22014-06-23 14:50:20 +0100675 gl->gl_lksb.sb_lvbptr = kzalloc(GFS2_MIN_LVB_SIZE, GFP_NOFS);
David Teigland4e2f8842012-11-14 13:47:37 -0500676 if (!gl->gl_lksb.sb_lvbptr) {
David Teiglanddba2d702012-11-14 13:46:53 -0500677 kmem_cache_free(cachep, gl);
678 return -ENOMEM;
679 }
David Teiglanddba2d702012-11-14 13:46:53 -0500680 }
681
Steven Whitehouse8f052282010-01-29 15:21:27 +0000682 atomic_inc(&sdp->sd_glock_disposal);
Bob Peterson88ffbf32015-03-16 11:02:46 -0500683 gl->gl_node.next = NULL;
Steven Whitehouseec45d9f2006-08-30 10:36:52 -0400684 gl->gl_flags = 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000685 gl->gl_name = name;
Steven Whitehousee66cf162013-10-15 15:18:08 +0100686 gl->gl_lockref.count = 1;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000687 gl->gl_state = LM_ST_UNLOCKED;
Steven Whitehouse6802e342008-05-21 17:03:22 +0100688 gl->gl_target = LM_ST_UNLOCKED;
Benjamin Marzinskic4f68a12007-08-23 13:19:05 -0500689 gl->gl_demote_state = LM_ST_EXCLUSIVE;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000690 gl->gl_ops = glops;
Steven Whitehousea2457692012-01-20 10:38:36 +0000691 gl->gl_dstamp = ktime_set(0, 0);
692 preempt_disable();
693 /* We use the global stats to estimate the initial per-glock stats */
694 gl->gl_stats = this_cpu_ptr(sdp->sd_lkstats)->lkstats[glops->go_type];
695 preempt_enable();
696 gl->gl_stats.stats[GFS2_LKS_DCOUNT] = 0;
697 gl->gl_stats.stats[GFS2_LKS_QCOUNT] = 0;
Benjamin Marzinskic4f68a12007-08-23 13:19:05 -0500698 gl->gl_tchange = jiffies;
Steven Whitehouseec45d9f2006-08-30 10:36:52 -0400699 gl->gl_object = NULL;
Bob Peterson7cf8dcd2011-06-15 11:41:48 -0400700 gl->gl_hold_time = GL_GLOCK_DFT_HOLD;
Benjamin Marzinskic4f68a12007-08-23 13:19:05 -0500701 INIT_DELAYED_WORK(&gl->gl_work, glock_work_func);
Benjamin Marzinskib94a1702009-07-23 18:52:34 -0500702 INIT_WORK(&gl->gl_delete, delete_work_func);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000703
Steven Whitehouse009d8512009-12-08 12:12:13 +0000704 mapping = gfs2_glock2aspace(gl);
705 if (mapping) {
706 mapping->a_ops = &gfs2_meta_aops;
707 mapping->host = s->s_bdev->bd_inode;
708 mapping->flags = 0;
709 mapping_set_gfp_mask(mapping, GFP_NOFS);
Rafael Aquini252aa6f2012-12-11 16:02:35 -0800710 mapping->private_data = NULL;
Steven Whitehouse009d8512009-12-08 12:12:13 +0000711 mapping->writeback_index = 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000712 }
713
Bob Peterson88ffbf32015-03-16 11:02:46 -0500714again:
715 ret = rhashtable_lookup_insert_fast(&gl_hash_table, &gl->gl_node,
716 ht_parms);
717 if (ret == 0) {
718 *glp = gl;
719 return 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000720 }
721
Bob Peterson88ffbf32015-03-16 11:02:46 -0500722 if (ret == -EEXIST) {
723 ret = 0;
724 tmp = rhashtable_lookup_fast(&gl_hash_table, &name, ht_parms);
725 if (tmp == NULL || !lockref_get_not_dead(&tmp->gl_lockref)) {
726 if (++tries < 100) {
727 cond_resched();
728 goto again;
729 }
730 tmp = NULL;
731 ret = -ENOMEM;
732 }
733 } else {
734 WARN_ON_ONCE(ret);
735 }
736 kfree(gl->gl_lksb.sb_lvbptr);
737 kmem_cache_free(cachep, gl);
738 atomic_dec(&sdp->sd_glock_disposal);
739 *glp = tmp;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000740
Bob Peterson88ffbf32015-03-16 11:02:46 -0500741 return ret;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000742}
743
744/**
745 * gfs2_holder_init - initialize a struct gfs2_holder in the default way
746 * @gl: the glock
747 * @state: the state we're requesting
748 * @flags: the modifier flags
749 * @gh: the holder structure
750 *
751 */
752
Bob Petersonb58bf402015-07-24 09:45:43 -0500753void gfs2_holder_init(struct gfs2_glock *gl, unsigned int state, u16 flags,
David Teiglandb3b94fa2006-01-16 16:50:04 +0000754 struct gfs2_holder *gh)
755{
756 INIT_LIST_HEAD(&gh->gh_list);
757 gh->gh_gl = gl;
Fabian Frederickd29c0af2014-10-03 20:15:36 +0200758 gh->gh_ip = _RET_IP_;
Pavel Emelyanovb1e058d2008-02-07 00:13:19 -0800759 gh->gh_owner_pid = get_pid(task_pid(current));
David Teiglandb3b94fa2006-01-16 16:50:04 +0000760 gh->gh_state = state;
761 gh->gh_flags = flags;
762 gh->gh_error = 0;
763 gh->gh_iflags = 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000764 gfs2_glock_hold(gl);
765}
766
767/**
768 * gfs2_holder_reinit - reinitialize a struct gfs2_holder so we can requeue it
769 * @state: the state we're requesting
770 * @flags: the modifier flags
771 * @gh: the holder structure
772 *
773 * Don't mess with the glock.
774 *
775 */
776
Bob Petersonb58bf402015-07-24 09:45:43 -0500777void gfs2_holder_reinit(unsigned int state, u16 flags, struct gfs2_holder *gh)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000778{
779 gh->gh_state = state;
Steven Whitehouse579b78a2006-04-26 14:58:26 -0400780 gh->gh_flags = flags;
Steven Whitehouse3b8249f2007-03-16 09:40:31 +0000781 gh->gh_iflags = 0;
Fabian Frederickd29c0af2014-10-03 20:15:36 +0200782 gh->gh_ip = _RET_IP_;
Markus Elfring30badc92014-11-18 11:31:23 +0100783 put_pid(gh->gh_owner_pid);
Bob Peterson1a0eae82010-04-14 11:58:16 -0400784 gh->gh_owner_pid = get_pid(task_pid(current));
David Teiglandb3b94fa2006-01-16 16:50:04 +0000785}
786
787/**
788 * gfs2_holder_uninit - uninitialize a holder structure (drop glock reference)
789 * @gh: the holder structure
790 *
791 */
792
793void gfs2_holder_uninit(struct gfs2_holder *gh)
794{
Pavel Emelyanovb1e058d2008-02-07 00:13:19 -0800795 put_pid(gh->gh_owner_pid);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000796 gfs2_glock_put(gh->gh_gl);
797 gh->gh_gl = NULL;
Steven Whitehoused0dc80d2006-03-29 14:36:49 -0500798 gh->gh_ip = 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000799}
800
Steven Whitehousefe64d512009-05-19 10:01:18 +0100801/**
Bob Peterson07a79042012-08-09 12:48:44 -0500802 * gfs2_glock_wait - wait on a glock acquisition
803 * @gh: the glock holder
804 *
805 * Returns: 0 on success
806 */
807
808int gfs2_glock_wait(struct gfs2_holder *gh)
Steven Whitehousefee852e2007-01-17 15:33:23 +0000809{
Bob Peterson7cf8dcd2011-06-15 11:41:48 -0400810 unsigned long time1 = jiffies;
811
Steven Whitehousefee852e2007-01-17 15:33:23 +0000812 might_sleep();
NeilBrown74316202014-07-07 15:16:04 +1000813 wait_on_bit(&gh->gh_iflags, HIF_WAIT, TASK_UNINTERRUPTIBLE);
Bob Peterson7cf8dcd2011-06-15 11:41:48 -0400814 if (time_after(jiffies, time1 + HZ)) /* have we waited > a second? */
815 /* Lengthen the minimum hold time. */
816 gh->gh_gl->gl_hold_time = min(gh->gh_gl->gl_hold_time +
817 GL_GLOCK_HOLD_INCR,
818 GL_GLOCK_MAX_HOLD);
Bob Peterson07a79042012-08-09 12:48:44 -0500819 return gh->gh_error;
Abhijith Dasd93cfa92007-06-11 08:22:32 +0100820}
821
David Teiglandb3b94fa2006-01-16 16:50:04 +0000822/**
Steven Whitehouse3b8249f2007-03-16 09:40:31 +0000823 * handle_callback - process a demote request
David Teiglandb3b94fa2006-01-16 16:50:04 +0000824 * @gl: the glock
825 * @state: the state the caller wants us to change to
826 *
Steven Whitehouse3b8249f2007-03-16 09:40:31 +0000827 * There are only two requests that we are going to see in actual
828 * practise: LM_ST_SHARED and LM_ST_UNLOCKED
David Teiglandb3b94fa2006-01-16 16:50:04 +0000829 */
830
Benjamin Marzinskic4f68a12007-08-23 13:19:05 -0500831static void handle_callback(struct gfs2_glock *gl, unsigned int state,
Steven Whitehouse81ffbf62013-04-10 10:26:55 +0100832 unsigned long delay, bool remote)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000833{
Benjamin Marzinskic4f68a12007-08-23 13:19:05 -0500834 int bit = delay ? GLF_PENDING_DEMOTE : GLF_DEMOTE;
835
Benjamin Marzinskic4f68a12007-08-23 13:19:05 -0500836 set_bit(bit, &gl->gl_flags);
837 if (gl->gl_demote_state == LM_ST_EXCLUSIVE) {
Steven Whitehouse3b8249f2007-03-16 09:40:31 +0000838 gl->gl_demote_state = state;
839 gl->gl_demote_time = jiffies;
Josef Whiter26caee52007-07-23 10:02:40 +0100840 } else if (gl->gl_demote_state != LM_ST_UNLOCKED &&
841 gl->gl_demote_state != state) {
Steven Whitehouse6802e342008-05-21 17:03:22 +0100842 gl->gl_demote_state = LM_ST_UNLOCKED;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000843 }
Benjamin Marzinskib94a1702009-07-23 18:52:34 -0500844 if (gl->gl_ops->go_callback)
Steven Whitehouse81ffbf62013-04-10 10:26:55 +0100845 gl->gl_ops->go_callback(gl, remote);
Steven Whitehouse7bd8b2e2013-04-10 10:32:05 +0100846 trace_gfs2_demote_rq(gl, remote);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000847}
848
Steven Whitehouse6802e342008-05-21 17:03:22 +0100849void gfs2_print_dbg(struct seq_file *seq, const char *fmt, ...)
Robert Peterson7c52b162007-03-16 10:26:37 +0000850{
Joe Perches5e690692010-11-09 16:35:20 -0800851 struct va_format vaf;
Robert Peterson7c52b162007-03-16 10:26:37 +0000852 va_list args;
853
854 va_start(args, fmt);
Joe Perches5e690692010-11-09 16:35:20 -0800855
Steven Whitehouse6802e342008-05-21 17:03:22 +0100856 if (seq) {
Steven Whitehouse1bb49302012-06-11 13:26:50 +0100857 seq_vprintf(seq, fmt, args);
Steven Whitehouse6802e342008-05-21 17:03:22 +0100858 } else {
Joe Perches5e690692010-11-09 16:35:20 -0800859 vaf.fmt = fmt;
860 vaf.va = &args;
861
Joe Perchesd77d1b52014-03-06 12:10:45 -0800862 pr_err("%pV", &vaf);
Steven Whitehouse6802e342008-05-21 17:03:22 +0100863 }
Joe Perches5e690692010-11-09 16:35:20 -0800864
Robert Peterson7c52b162007-03-16 10:26:37 +0000865 va_end(args);
866}
867
David Teiglandb3b94fa2006-01-16 16:50:04 +0000868/**
David Teiglandb3b94fa2006-01-16 16:50:04 +0000869 * add_to_queue - Add a holder to the wait queue (but look for recursion)
870 * @gh: the holder structure to add
871 *
Steven Whitehouse6802e342008-05-21 17:03:22 +0100872 * Eventually we should move the recursive locking trap to a
873 * debugging option or something like that. This is the fast
874 * path and needs to have the minimum number of distractions.
875 *
David Teiglandb3b94fa2006-01-16 16:50:04 +0000876 */
877
Steven Whitehouse6802e342008-05-21 17:03:22 +0100878static inline void add_to_queue(struct gfs2_holder *gh)
Andreas Gruenbacherf3dd1642015-10-29 10:58:09 -0500879__releases(&gl->gl_lockref.lock)
880__acquires(&gl->gl_lockref.lock)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000881{
882 struct gfs2_glock *gl = gh->gh_gl;
Bob Peterson15562c42015-03-16 11:52:05 -0500883 struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
Steven Whitehouse6802e342008-05-21 17:03:22 +0100884 struct list_head *insert_pt = NULL;
885 struct gfs2_holder *gh2;
Bob Petersone5dc76b2012-08-09 12:48:46 -0500886 int try_futile = 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000887
Pavel Emelyanovb1e058d2008-02-07 00:13:19 -0800888 BUG_ON(gh->gh_owner_pid == NULL);
Steven Whitehousefee852e2007-01-17 15:33:23 +0000889 if (test_and_set_bit(HIF_WAIT, &gh->gh_iflags))
890 BUG();
Steven Whitehouse190562b2006-04-20 16:57:23 -0400891
Steven Whitehouse6802e342008-05-21 17:03:22 +0100892 if (gh->gh_flags & (LM_FLAG_TRY | LM_FLAG_TRY_1CB)) {
893 if (test_bit(GLF_LOCK, &gl->gl_flags))
Bob Petersone5dc76b2012-08-09 12:48:46 -0500894 try_futile = !may_grant(gl, gh);
Steven Whitehouse6802e342008-05-21 17:03:22 +0100895 if (test_bit(GLF_INVALIDATE_IN_PROGRESS, &gl->gl_flags))
896 goto fail;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000897 }
898
Steven Whitehouse6802e342008-05-21 17:03:22 +0100899 list_for_each_entry(gh2, &gl->gl_holders, gh_list) {
900 if (unlikely(gh2->gh_owner_pid == gh->gh_owner_pid &&
901 (gh->gh_gl->gl_ops->go_type != LM_TYPE_FLOCK)))
902 goto trap_recursive;
Bob Petersone5dc76b2012-08-09 12:48:46 -0500903 if (try_futile &&
904 !(gh2->gh_flags & (LM_FLAG_TRY | LM_FLAG_TRY_1CB))) {
Steven Whitehouse6802e342008-05-21 17:03:22 +0100905fail:
906 gh->gh_error = GLR_TRYFAILED;
907 gfs2_holder_wake(gh);
908 return;
909 }
910 if (test_bit(HIF_HOLDER, &gh2->gh_iflags))
911 continue;
912 if (unlikely((gh->gh_flags & LM_FLAG_PRIORITY) && !insert_pt))
913 insert_pt = &gh2->gh_list;
914 }
Steven Whitehouse7b5e3d52010-09-03 09:39:20 +0100915 set_bit(GLF_QUEUED, &gl->gl_flags);
Steven Whitehouseedae38a2011-01-31 09:38:12 +0000916 trace_gfs2_glock_queue(gh, 1);
Steven Whitehousea2457692012-01-20 10:38:36 +0000917 gfs2_glstats_inc(gl, GFS2_LKS_QCOUNT);
918 gfs2_sbstats_inc(gl, GFS2_LKS_QCOUNT);
Steven Whitehouse6802e342008-05-21 17:03:22 +0100919 if (likely(insert_pt == NULL)) {
920 list_add_tail(&gh->gh_list, &gl->gl_holders);
921 if (unlikely(gh->gh_flags & LM_FLAG_PRIORITY))
922 goto do_cancel;
923 return;
924 }
925 list_add_tail(&gh->gh_list, insert_pt);
926do_cancel:
927 gh = list_entry(gl->gl_holders.next, struct gfs2_holder, gh_list);
928 if (!(gh->gh_flags & LM_FLAG_PRIORITY)) {
Andreas Gruenbacherf3dd1642015-10-29 10:58:09 -0500929 spin_unlock(&gl->gl_lockref.lock);
Steven Whitehouse048bca22008-05-23 14:46:04 +0100930 if (sdp->sd_lockstruct.ls_ops->lm_cancel)
Steven Whitehousef057f6c2009-01-12 10:43:39 +0000931 sdp->sd_lockstruct.ls_ops->lm_cancel(gl);
Andreas Gruenbacherf3dd1642015-10-29 10:58:09 -0500932 spin_lock(&gl->gl_lockref.lock);
Steven Whitehouse6802e342008-05-21 17:03:22 +0100933 }
934 return;
935
936trap_recursive:
Fabian Frederickfc554ed2014-03-05 22:06:42 +0800937 pr_err("original: %pSR\n", (void *)gh2->gh_ip);
938 pr_err("pid: %d\n", pid_nr(gh2->gh_owner_pid));
939 pr_err("lock type: %d req lock state : %d\n",
Steven Whitehouse6802e342008-05-21 17:03:22 +0100940 gh2->gh_gl->gl_name.ln_type, gh2->gh_state);
Fabian Frederickfc554ed2014-03-05 22:06:42 +0800941 pr_err("new: %pSR\n", (void *)gh->gh_ip);
942 pr_err("pid: %d\n", pid_nr(gh->gh_owner_pid));
943 pr_err("lock type: %d req lock state : %d\n",
Steven Whitehouse6802e342008-05-21 17:03:22 +0100944 gh->gh_gl->gl_name.ln_type, gh->gh_state);
Steven Whitehouse8eae1ca2012-10-15 10:57:02 +0100945 gfs2_dump_glock(NULL, gl);
Steven Whitehouse6802e342008-05-21 17:03:22 +0100946 BUG();
David Teiglandb3b94fa2006-01-16 16:50:04 +0000947}
948
949/**
950 * gfs2_glock_nq - enqueue a struct gfs2_holder onto a glock (acquire a glock)
951 * @gh: the holder structure
952 *
953 * if (gh->gh_flags & GL_ASYNC), this never returns an error
954 *
955 * Returns: 0, GLR_TRYFAILED, or errno on failure
956 */
957
958int gfs2_glock_nq(struct gfs2_holder *gh)
959{
960 struct gfs2_glock *gl = gh->gh_gl;
Bob Peterson15562c42015-03-16 11:52:05 -0500961 struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000962 int error = 0;
963
Steven Whitehouse6802e342008-05-21 17:03:22 +0100964 if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
David Teiglandb3b94fa2006-01-16 16:50:04 +0000965 return -EIO;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000966
Steven Whitehousef42ab082011-04-14 16:50:31 +0100967 if (test_bit(GLF_LRU, &gl->gl_flags))
968 gfs2_glock_remove_from_lru(gl);
969
Andreas Gruenbacherf3dd1642015-10-29 10:58:09 -0500970 spin_lock(&gl->gl_lockref.lock);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000971 add_to_queue(gh);
Bob Peterson01b172b2014-03-12 10:32:20 -0400972 if (unlikely((LM_FLAG_NOEXP & gh->gh_flags) &&
973 test_and_clear_bit(GLF_FROZEN, &gl->gl_flags))) {
Steven Whitehouse0809f6e2010-08-02 10:15:17 +0100974 set_bit(GLF_REPLY_PENDING, &gl->gl_flags);
Bob Peterson01b172b2014-03-12 10:32:20 -0400975 gl->gl_lockref.count++;
976 if (queue_delayed_work(glock_workqueue, &gl->gl_work, 0) == 0)
977 gl->gl_lockref.count--;
978 }
Steven Whitehouse6802e342008-05-21 17:03:22 +0100979 run_queue(gl, 1);
Andreas Gruenbacherf3dd1642015-10-29 10:58:09 -0500980 spin_unlock(&gl->gl_lockref.lock);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000981
Steven Whitehouse6802e342008-05-21 17:03:22 +0100982 if (!(gh->gh_flags & GL_ASYNC))
983 error = gfs2_glock_wait(gh);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000984
David Teiglandb3b94fa2006-01-16 16:50:04 +0000985 return error;
986}
987
988/**
989 * gfs2_glock_poll - poll to see if an async request has been completed
990 * @gh: the holder
991 *
992 * Returns: 1 if the request is ready to be gfs2_glock_wait()ed on
993 */
994
995int gfs2_glock_poll(struct gfs2_holder *gh)
996{
Steven Whitehouse6802e342008-05-21 17:03:22 +0100997 return test_bit(HIF_WAIT, &gh->gh_iflags) ? 0 : 1;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000998}
999
1000/**
1001 * gfs2_glock_dq - dequeue a struct gfs2_holder from a glock (release a glock)
1002 * @gh: the glock holder
1003 *
1004 */
1005
1006void gfs2_glock_dq(struct gfs2_holder *gh)
1007{
1008 struct gfs2_glock *gl = gh->gh_gl;
Steven Whitehouse8fb4b532006-08-30 09:30:00 -04001009 const struct gfs2_glock_operations *glops = gl->gl_ops;
Benjamin Marzinskic4f68a12007-08-23 13:19:05 -05001010 unsigned delay = 0;
Steven Whitehouse6802e342008-05-21 17:03:22 +01001011 int fast_path = 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001012
Andreas Gruenbacherf3dd1642015-10-29 10:58:09 -05001013 spin_lock(&gl->gl_lockref.lock);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001014 if (gh->gh_flags & GL_NOCACHE)
Steven Whitehouse81ffbf62013-04-10 10:26:55 +01001015 handle_callback(gl, LM_ST_UNLOCKED, 0, false);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001016
David Teiglandb3b94fa2006-01-16 16:50:04 +00001017 list_del_init(&gh->gh_list);
Steven Whitehouse6802e342008-05-21 17:03:22 +01001018 if (find_first_holder(gl) == NULL) {
Steven Whitehouse3042a2c2007-11-02 08:39:34 +00001019 if (glops->go_unlock) {
Steven Whitehouse6802e342008-05-21 17:03:22 +01001020 GLOCK_BUG_ON(gl, test_and_set_bit(GLF_LOCK, &gl->gl_flags));
Andreas Gruenbacherf3dd1642015-10-29 10:58:09 -05001021 spin_unlock(&gl->gl_lockref.lock);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001022 glops->go_unlock(gh);
Andreas Gruenbacherf3dd1642015-10-29 10:58:09 -05001023 spin_lock(&gl->gl_lockref.lock);
Steven Whitehouse6802e342008-05-21 17:03:22 +01001024 clear_bit(GLF_LOCK, &gl->gl_flags);
Steven Whitehouse3042a2c2007-11-02 08:39:34 +00001025 }
Steven Whitehouse6802e342008-05-21 17:03:22 +01001026 if (list_empty(&gl->gl_holders) &&
1027 !test_bit(GLF_PENDING_DEMOTE, &gl->gl_flags) &&
1028 !test_bit(GLF_DEMOTE, &gl->gl_flags))
1029 fast_path = 1;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001030 }
Bob Petersone7ccaf52015-06-12 13:15:54 -05001031 if (!test_bit(GLF_LFLUSH, &gl->gl_flags) && demote_ok(gl) &&
1032 (glops->go_flags & GLOF_LRU))
Bob Peterson4abb6ad2012-08-09 12:48:43 -05001033 gfs2_glock_add_to_lru(gl);
1034
Steven Whitehouse63997772009-06-12 08:49:20 +01001035 trace_gfs2_glock_queue(gh, 0);
Andreas Gruenbacherf3dd1642015-10-29 10:58:09 -05001036 spin_unlock(&gl->gl_lockref.lock);
Steven Whitehouse6802e342008-05-21 17:03:22 +01001037 if (likely(fast_path))
1038 return;
Benjamin Marzinskic4f68a12007-08-23 13:19:05 -05001039
1040 gfs2_glock_hold(gl);
1041 if (test_bit(GLF_PENDING_DEMOTE, &gl->gl_flags) &&
Bob Peterson7cf8dcd2011-06-15 11:41:48 -04001042 !test_bit(GLF_DEMOTE, &gl->gl_flags) &&
1043 gl->gl_name.ln_type == LM_TYPE_INODE)
1044 delay = gl->gl_hold_time;
Benjamin Marzinskic4f68a12007-08-23 13:19:05 -05001045 if (queue_delayed_work(glock_workqueue, &gl->gl_work, delay) == 0)
1046 gfs2_glock_put(gl);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001047}
1048
Abhijith Dasd93cfa92007-06-11 08:22:32 +01001049void gfs2_glock_dq_wait(struct gfs2_holder *gh)
1050{
1051 struct gfs2_glock *gl = gh->gh_gl;
1052 gfs2_glock_dq(gh);
Bob Peterson81e1d452012-08-09 12:48:45 -05001053 might_sleep();
NeilBrown74316202014-07-07 15:16:04 +10001054 wait_on_bit(&gl->gl_flags, GLF_DEMOTE, TASK_UNINTERRUPTIBLE);
Abhijith Dasd93cfa92007-06-11 08:22:32 +01001055}
1056
David Teiglandb3b94fa2006-01-16 16:50:04 +00001057/**
David Teiglandb3b94fa2006-01-16 16:50:04 +00001058 * gfs2_glock_dq_uninit - dequeue a holder from a glock and initialize it
1059 * @gh: the holder structure
1060 *
1061 */
1062
1063void gfs2_glock_dq_uninit(struct gfs2_holder *gh)
1064{
1065 gfs2_glock_dq(gh);
1066 gfs2_holder_uninit(gh);
1067}
1068
1069/**
1070 * gfs2_glock_nq_num - acquire a glock based on lock number
1071 * @sdp: the filesystem
1072 * @number: the lock number
1073 * @glops: the glock operations for the type of glock
1074 * @state: the state to acquire the glock in
Lucas De Marchi25985ed2011-03-30 22:57:33 -03001075 * @flags: modifier flags for the acquisition
David Teiglandb3b94fa2006-01-16 16:50:04 +00001076 * @gh: the struct gfs2_holder
1077 *
1078 * Returns: errno
1079 */
1080
Steven Whitehousecd915492006-09-04 12:49:07 -04001081int gfs2_glock_nq_num(struct gfs2_sbd *sdp, u64 number,
Steven Whitehouse8fb4b532006-08-30 09:30:00 -04001082 const struct gfs2_glock_operations *glops,
Bob Petersonb58bf402015-07-24 09:45:43 -05001083 unsigned int state, u16 flags, struct gfs2_holder *gh)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001084{
1085 struct gfs2_glock *gl;
1086 int error;
1087
1088 error = gfs2_glock_get(sdp, number, glops, CREATE, &gl);
1089 if (!error) {
1090 error = gfs2_glock_nq_init(gl, state, flags, gh);
1091 gfs2_glock_put(gl);
1092 }
1093
1094 return error;
1095}
1096
1097/**
1098 * glock_compare - Compare two struct gfs2_glock structures for sorting
1099 * @arg_a: the first structure
1100 * @arg_b: the second structure
1101 *
1102 */
1103
1104static int glock_compare(const void *arg_a, const void *arg_b)
1105{
Steven Whitehousea5e08a92006-09-09 17:07:05 -04001106 const struct gfs2_holder *gh_a = *(const struct gfs2_holder **)arg_a;
1107 const struct gfs2_holder *gh_b = *(const struct gfs2_holder **)arg_b;
1108 const struct lm_lockname *a = &gh_a->gh_gl->gl_name;
1109 const struct lm_lockname *b = &gh_b->gh_gl->gl_name;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001110
1111 if (a->ln_number > b->ln_number)
Steven Whitehousea5e08a92006-09-09 17:07:05 -04001112 return 1;
1113 if (a->ln_number < b->ln_number)
1114 return -1;
Steven Whitehouse1c0f4872007-01-22 12:10:39 -05001115 BUG_ON(gh_a->gh_gl->gl_ops->go_type == gh_b->gh_gl->gl_ops->go_type);
Steven Whitehousea5e08a92006-09-09 17:07:05 -04001116 return 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001117}
1118
1119/**
1120 * nq_m_sync - synchonously acquire more than one glock in deadlock free order
1121 * @num_gh: the number of structures
1122 * @ghs: an array of struct gfs2_holder structures
1123 *
1124 * Returns: 0 on success (all glocks acquired),
1125 * errno on failure (no glocks acquired)
1126 */
1127
1128static int nq_m_sync(unsigned int num_gh, struct gfs2_holder *ghs,
1129 struct gfs2_holder **p)
1130{
1131 unsigned int x;
1132 int error = 0;
1133
1134 for (x = 0; x < num_gh; x++)
1135 p[x] = &ghs[x];
1136
1137 sort(p, num_gh, sizeof(struct gfs2_holder *), glock_compare, NULL);
1138
1139 for (x = 0; x < num_gh; x++) {
1140 p[x]->gh_flags &= ~(LM_FLAG_TRY | GL_ASYNC);
1141
1142 error = gfs2_glock_nq(p[x]);
1143 if (error) {
1144 while (x--)
1145 gfs2_glock_dq(p[x]);
1146 break;
1147 }
1148 }
1149
1150 return error;
1151}
1152
1153/**
1154 * gfs2_glock_nq_m - acquire multiple glocks
1155 * @num_gh: the number of structures
1156 * @ghs: an array of struct gfs2_holder structures
1157 *
David Teiglandb3b94fa2006-01-16 16:50:04 +00001158 *
1159 * Returns: 0 on success (all glocks acquired),
1160 * errno on failure (no glocks acquired)
1161 */
1162
1163int gfs2_glock_nq_m(unsigned int num_gh, struct gfs2_holder *ghs)
1164{
Steven Whitehouseeaf5bd32007-06-19 15:38:17 +01001165 struct gfs2_holder *tmp[4];
1166 struct gfs2_holder **pph = tmp;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001167 int error = 0;
1168
Steven Whitehouseeaf5bd32007-06-19 15:38:17 +01001169 switch(num_gh) {
1170 case 0:
David Teiglandb3b94fa2006-01-16 16:50:04 +00001171 return 0;
Steven Whitehouseeaf5bd32007-06-19 15:38:17 +01001172 case 1:
David Teiglandb3b94fa2006-01-16 16:50:04 +00001173 ghs->gh_flags &= ~(LM_FLAG_TRY | GL_ASYNC);
1174 return gfs2_glock_nq(ghs);
Steven Whitehouseeaf5bd32007-06-19 15:38:17 +01001175 default:
1176 if (num_gh <= 4)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001177 break;
Steven Whitehouseeaf5bd32007-06-19 15:38:17 +01001178 pph = kmalloc(num_gh * sizeof(struct gfs2_holder *), GFP_NOFS);
1179 if (!pph)
1180 return -ENOMEM;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001181 }
1182
Steven Whitehouseeaf5bd32007-06-19 15:38:17 +01001183 error = nq_m_sync(num_gh, ghs, pph);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001184
Steven Whitehouseeaf5bd32007-06-19 15:38:17 +01001185 if (pph != tmp)
1186 kfree(pph);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001187
1188 return error;
1189}
1190
1191/**
1192 * gfs2_glock_dq_m - release multiple glocks
1193 * @num_gh: the number of structures
1194 * @ghs: an array of struct gfs2_holder structures
1195 *
1196 */
1197
1198void gfs2_glock_dq_m(unsigned int num_gh, struct gfs2_holder *ghs)
1199{
Bob Petersonfa1bbde2011-03-10 11:41:57 -05001200 while (num_gh--)
1201 gfs2_glock_dq(&ghs[num_gh]);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001202}
1203
Steven Whitehousef057f6c2009-01-12 10:43:39 +00001204void gfs2_glock_cb(struct gfs2_glock *gl, unsigned int state)
Steven Whitehouseda755fd2008-01-30 15:34:04 +00001205{
Benjamin Marzinskic4f68a12007-08-23 13:19:05 -05001206 unsigned long delay = 0;
1207 unsigned long holdtime;
1208 unsigned long now = jiffies;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001209
Steven Whitehousef057f6c2009-01-12 10:43:39 +00001210 gfs2_glock_hold(gl);
Bob Peterson7cf8dcd2011-06-15 11:41:48 -04001211 holdtime = gl->gl_tchange + gl->gl_hold_time;
1212 if (test_bit(GLF_QUEUED, &gl->gl_flags) &&
1213 gl->gl_name.ln_type == LM_TYPE_INODE) {
Steven Whitehouse7b5e3d52010-09-03 09:39:20 +01001214 if (time_before(now, holdtime))
1215 delay = holdtime - now;
1216 if (test_bit(GLF_REPLY_PENDING, &gl->gl_flags))
Bob Peterson7cf8dcd2011-06-15 11:41:48 -04001217 delay = gl->gl_hold_time;
Steven Whitehouse7b5e3d52010-09-03 09:39:20 +01001218 }
David Teiglandb3b94fa2006-01-16 16:50:04 +00001219
Andreas Gruenbacherf3dd1642015-10-29 10:58:09 -05001220 spin_lock(&gl->gl_lockref.lock);
Steven Whitehouse81ffbf62013-04-10 10:26:55 +01001221 handle_callback(gl, state, delay, true);
Andreas Gruenbacherf3dd1642015-10-29 10:58:09 -05001222 spin_unlock(&gl->gl_lockref.lock);
Benjamin Marzinskic4f68a12007-08-23 13:19:05 -05001223 if (queue_delayed_work(glock_workqueue, &gl->gl_work, delay) == 0)
1224 gfs2_glock_put(gl);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001225}
1226
1227/**
Steven Whitehouse0809f6e2010-08-02 10:15:17 +01001228 * gfs2_should_freeze - Figure out if glock should be frozen
1229 * @gl: The glock in question
1230 *
1231 * Glocks are not frozen if (a) the result of the dlm operation is
1232 * an error, (b) the locking operation was an unlock operation or
1233 * (c) if there is a "noexp" flagged request anywhere in the queue
1234 *
1235 * Returns: 1 if freezing should occur, 0 otherwise
1236 */
1237
1238static int gfs2_should_freeze(const struct gfs2_glock *gl)
1239{
1240 const struct gfs2_holder *gh;
1241
1242 if (gl->gl_reply & ~LM_OUT_ST_MASK)
1243 return 0;
1244 if (gl->gl_target == LM_ST_UNLOCKED)
1245 return 0;
1246
1247 list_for_each_entry(gh, &gl->gl_holders, gh_list) {
1248 if (test_bit(HIF_HOLDER, &gh->gh_iflags))
1249 continue;
1250 if (LM_FLAG_NOEXP & gh->gh_flags)
1251 return 0;
1252 }
1253
1254 return 1;
1255}
1256
1257/**
Steven Whitehousef057f6c2009-01-12 10:43:39 +00001258 * gfs2_glock_complete - Callback used by locking
1259 * @gl: Pointer to the glock
1260 * @ret: The return value from the dlm
David Teiglandb3b94fa2006-01-16 16:50:04 +00001261 *
Andreas Gruenbacherf3dd1642015-10-29 10:58:09 -05001262 * The gl_reply field is under the gl_lockref.lock lock so that it is ok
Steven Whitehouse47a25382010-11-30 15:49:31 +00001263 * to use a bitfield shared with other glock state fields.
David Teiglandb3b94fa2006-01-16 16:50:04 +00001264 */
1265
Steven Whitehousef057f6c2009-01-12 10:43:39 +00001266void gfs2_glock_complete(struct gfs2_glock *gl, int ret)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001267{
Bob Peterson15562c42015-03-16 11:52:05 -05001268 struct lm_lockstruct *ls = &gl->gl_name.ln_sbd->sd_lockstruct;
Steven Whitehouse0809f6e2010-08-02 10:15:17 +01001269
Andreas Gruenbacherf3dd1642015-10-29 10:58:09 -05001270 spin_lock(&gl->gl_lockref.lock);
Steven Whitehousef057f6c2009-01-12 10:43:39 +00001271 gl->gl_reply = ret;
Steven Whitehouse0809f6e2010-08-02 10:15:17 +01001272
David Teiglande0c2a9a2012-01-09 17:18:05 -05001273 if (unlikely(test_bit(DFL_BLOCK_LOCKS, &ls->ls_recover_flags))) {
Steven Whitehouse0809f6e2010-08-02 10:15:17 +01001274 if (gfs2_should_freeze(gl)) {
Steven Whitehousef057f6c2009-01-12 10:43:39 +00001275 set_bit(GLF_FROZEN, &gl->gl_flags);
Andreas Gruenbacherf3dd1642015-10-29 10:58:09 -05001276 spin_unlock(&gl->gl_lockref.lock);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001277 return;
Steven Whitehouse0809f6e2010-08-02 10:15:17 +01001278 }
David Teiglandb3b94fa2006-01-16 16:50:04 +00001279 }
Steven Whitehouse47a25382010-11-30 15:49:31 +00001280
Steven Whitehousee66cf162013-10-15 15:18:08 +01001281 gl->gl_lockref.count++;
Steven Whitehousef057f6c2009-01-12 10:43:39 +00001282 set_bit(GLF_REPLY_PENDING, &gl->gl_flags);
Andreas Gruenbacherf3dd1642015-10-29 10:58:09 -05001283 spin_unlock(&gl->gl_lockref.lock);
Steven Whitehousee66cf162013-10-15 15:18:08 +01001284
Steven Whitehousef057f6c2009-01-12 10:43:39 +00001285 if (queue_delayed_work(glock_workqueue, &gl->gl_work, 0) == 0)
1286 gfs2_glock_put(gl);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001287}
1288
Steven Whitehouse4506a512013-02-01 20:36:03 +00001289static int glock_cmp(void *priv, struct list_head *a, struct list_head *b)
1290{
1291 struct gfs2_glock *gla, *glb;
1292
1293 gla = list_entry(a, struct gfs2_glock, gl_lru);
1294 glb = list_entry(b, struct gfs2_glock, gl_lru);
1295
1296 if (gla->gl_name.ln_number > glb->gl_name.ln_number)
1297 return 1;
1298 if (gla->gl_name.ln_number < glb->gl_name.ln_number)
1299 return -1;
1300
1301 return 0;
1302}
1303
1304/**
1305 * gfs2_dispose_glock_lru - Demote a list of glocks
1306 * @list: The list to dispose of
1307 *
1308 * Disposing of glocks may involve disk accesses, so that here we sort
1309 * the glocks by number (i.e. disk location of the inodes) so that if
1310 * there are any such accesses, they'll be sent in order (mostly).
1311 *
1312 * Must be called under the lru_lock, but may drop and retake this
1313 * lock. While the lru_lock is dropped, entries may vanish from the
1314 * list, but no new entries will appear on the list (since it is
1315 * private)
1316 */
1317
1318static void gfs2_dispose_glock_lru(struct list_head *list)
1319__releases(&lru_lock)
1320__acquires(&lru_lock)
1321{
1322 struct gfs2_glock *gl;
1323
1324 list_sort(NULL, list, glock_cmp);
1325
1326 while(!list_empty(list)) {
1327 gl = list_entry(list->next, struct gfs2_glock, gl_lru);
1328 list_del_init(&gl->gl_lru);
Andreas Gruenbacherf3dd1642015-10-29 10:58:09 -05001329 if (!spin_trylock(&gl->gl_lockref.lock)) {
Steven Whitehouse94a09a32014-06-23 14:43:32 +01001330add_back_to_lru:
Steven Whitehousee66cf162013-10-15 15:18:08 +01001331 list_add(&gl->gl_lru, &lru_list);
1332 atomic_inc(&lru_count);
1333 continue;
1334 }
Steven Whitehouse94a09a32014-06-23 14:43:32 +01001335 if (test_and_set_bit(GLF_LOCK, &gl->gl_flags)) {
Andreas Gruenbacherf3dd1642015-10-29 10:58:09 -05001336 spin_unlock(&gl->gl_lockref.lock);
Steven Whitehouse94a09a32014-06-23 14:43:32 +01001337 goto add_back_to_lru;
1338 }
Steven Whitehouse4506a512013-02-01 20:36:03 +00001339 clear_bit(GLF_LRU, &gl->gl_flags);
Steven Whitehousee66cf162013-10-15 15:18:08 +01001340 gl->gl_lockref.count++;
Steven Whitehouse4506a512013-02-01 20:36:03 +00001341 if (demote_ok(gl))
Steven Whitehouse81ffbf62013-04-10 10:26:55 +01001342 handle_callback(gl, LM_ST_UNLOCKED, 0, false);
Steven Whitehouse4506a512013-02-01 20:36:03 +00001343 WARN_ON(!test_and_clear_bit(GLF_LOCK, &gl->gl_flags));
Steven Whitehouse4506a512013-02-01 20:36:03 +00001344 if (queue_delayed_work(glock_workqueue, &gl->gl_work, 0) == 0)
Steven Whitehousee66cf162013-10-15 15:18:08 +01001345 gl->gl_lockref.count--;
Andreas Gruenbacherf3dd1642015-10-29 10:58:09 -05001346 spin_unlock(&gl->gl_lockref.lock);
Steven Whitehouse94a09a32014-06-23 14:43:32 +01001347 cond_resched_lock(&lru_lock);
Steven Whitehouse4506a512013-02-01 20:36:03 +00001348 }
1349}
1350
Steven Whitehouse2a005852012-12-14 12:28:30 +00001351/**
1352 * gfs2_scan_glock_lru - Scan the LRU looking for locks to demote
1353 * @nr: The number of entries to scan
1354 *
Steven Whitehouse4506a512013-02-01 20:36:03 +00001355 * This function selects the entries on the LRU which are able to
1356 * be demoted, and then kicks off the process by calling
1357 * gfs2_dispose_glock_lru() above.
Steven Whitehouse2a005852012-12-14 12:28:30 +00001358 */
David Teiglandb3b94fa2006-01-16 16:50:04 +00001359
Dave Chinner1ab6c492013-08-28 10:18:09 +10001360static long gfs2_scan_glock_lru(int nr)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001361{
1362 struct gfs2_glock *gl;
Steven Whitehouse97cc1022008-11-20 13:39:47 +00001363 LIST_HEAD(skipped);
Steven Whitehouse4506a512013-02-01 20:36:03 +00001364 LIST_HEAD(dispose);
Dave Chinner1ab6c492013-08-28 10:18:09 +10001365 long freed = 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001366
Steven Whitehouse97cc1022008-11-20 13:39:47 +00001367 spin_lock(&lru_lock);
Dave Chinner1ab6c492013-08-28 10:18:09 +10001368 while ((nr-- >= 0) && !list_empty(&lru_list)) {
Steven Whitehouse97cc1022008-11-20 13:39:47 +00001369 gl = list_entry(lru_list.next, struct gfs2_glock, gl_lru);
Steven Whitehouse97cc1022008-11-20 13:39:47 +00001370
1371 /* Test for being demotable */
Steven Whitehouse94a09a32014-06-23 14:43:32 +01001372 if (!test_bit(GLF_LOCK, &gl->gl_flags)) {
Steven Whitehouse4506a512013-02-01 20:36:03 +00001373 list_move(&gl->gl_lru, &dispose);
1374 atomic_dec(&lru_count);
Dave Chinner1ab6c492013-08-28 10:18:09 +10001375 freed++;
Steven Whitehouse2163b1e2009-06-25 16:30:26 +01001376 continue;
Steven Whitehouse97cc1022008-11-20 13:39:47 +00001377 }
Steven Whitehouse4506a512013-02-01 20:36:03 +00001378
1379 list_move(&gl->gl_lru, &skipped);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001380 }
Steven Whitehouse97cc1022008-11-20 13:39:47 +00001381 list_splice(&skipped, &lru_list);
Steven Whitehouse4506a512013-02-01 20:36:03 +00001382 if (!list_empty(&dispose))
1383 gfs2_dispose_glock_lru(&dispose);
Steven Whitehouse97cc1022008-11-20 13:39:47 +00001384 spin_unlock(&lru_lock);
Dave Chinner1ab6c492013-08-28 10:18:09 +10001385
1386 return freed;
Steven Whitehouse2a005852012-12-14 12:28:30 +00001387}
1388
Dave Chinner1ab6c492013-08-28 10:18:09 +10001389static unsigned long gfs2_glock_shrink_scan(struct shrinker *shrink,
1390 struct shrink_control *sc)
Steven Whitehouse2a005852012-12-14 12:28:30 +00001391{
Dave Chinner1ab6c492013-08-28 10:18:09 +10001392 if (!(sc->gfp_mask & __GFP_FS))
1393 return SHRINK_STOP;
1394 return gfs2_scan_glock_lru(sc->nr_to_scan);
1395}
Steven Whitehouse2a005852012-12-14 12:28:30 +00001396
Dave Chinner1ab6c492013-08-28 10:18:09 +10001397static unsigned long gfs2_glock_shrink_count(struct shrinker *shrink,
1398 struct shrink_control *sc)
1399{
Glauber Costa55f841c2013-08-28 10:17:53 +10001400 return vfs_pressure_ratio(atomic_read(&lru_count));
David Teiglandb3b94fa2006-01-16 16:50:04 +00001401}
1402
Steven Whitehouse97cc1022008-11-20 13:39:47 +00001403static struct shrinker glock_shrinker = {
Steven Whitehouse97cc1022008-11-20 13:39:47 +00001404 .seeks = DEFAULT_SEEKS,
Dave Chinner1ab6c492013-08-28 10:18:09 +10001405 .count_objects = gfs2_glock_shrink_count,
1406 .scan_objects = gfs2_glock_shrink_scan,
Steven Whitehouse97cc1022008-11-20 13:39:47 +00001407};
1408
David Teiglandb3b94fa2006-01-16 16:50:04 +00001409/**
1410 * examine_bucket - Call a function for glock in a hash bucket
1411 * @examiner: the function
1412 * @sdp: the filesystem
1413 * @bucket: the bucket
1414 *
David Teiglandb3b94fa2006-01-16 16:50:04 +00001415 */
1416
Bob Peterson88ffbf32015-03-16 11:02:46 -05001417static void glock_hash_walk(glock_examiner examiner, const struct gfs2_sbd *sdp)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001418{
Steven Whitehousebc015cb2011-01-19 09:30:01 +00001419 struct gfs2_glock *gl;
Andrew Price3dd1dd82015-11-12 14:07:52 -06001420 struct rhash_head *pos;
Bob Peterson88ffbf32015-03-16 11:02:46 -05001421 const struct bucket_table *tbl;
1422 int i;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001423
Steven Whitehousebc015cb2011-01-19 09:30:01 +00001424 rcu_read_lock();
Bob Peterson88ffbf32015-03-16 11:02:46 -05001425 tbl = rht_dereference_rcu(gl_hash_table.tbl, &gl_hash_table);
1426 for (i = 0; i < tbl->size; i++) {
Andrew Price3dd1dd82015-11-12 14:07:52 -06001427 rht_for_each_entry_rcu(gl, pos, tbl, i, gl_node) {
Bob Peterson88ffbf32015-03-16 11:02:46 -05001428 if ((gl->gl_name.ln_sbd == sdp) &&
1429 lockref_get_not_dead(&gl->gl_lockref))
1430 examiner(gl);
1431 }
David Teiglandb3b94fa2006-01-16 16:50:04 +00001432 }
Steven Whitehousebc015cb2011-01-19 09:30:01 +00001433 rcu_read_unlock();
Steven Whitehouse8fbbfd22007-08-01 13:57:10 +01001434 cond_resched();
Steven Whitehousebc015cb2011-01-19 09:30:01 +00001435}
1436
Steven Whitehousef057f6c2009-01-12 10:43:39 +00001437/**
1438 * thaw_glock - thaw out a glock which has an unprocessed reply waiting
1439 * @gl: The glock to thaw
1440 *
Steven Whitehousef057f6c2009-01-12 10:43:39 +00001441 */
1442
1443static void thaw_glock(struct gfs2_glock *gl)
1444{
1445 if (!test_and_clear_bit(GLF_FROZEN, &gl->gl_flags))
Steven Whitehouse7286b312013-08-20 09:35:09 +01001446 goto out;
Steven Whitehousef057f6c2009-01-12 10:43:39 +00001447 set_bit(GLF_REPLY_PENDING, &gl->gl_flags);
Steven Whitehouse7286b312013-08-20 09:35:09 +01001448 if (queue_delayed_work(glock_workqueue, &gl->gl_work, 0) == 0) {
1449out:
Steven Whitehousef057f6c2009-01-12 10:43:39 +00001450 gfs2_glock_put(gl);
Steven Whitehouse7286b312013-08-20 09:35:09 +01001451 }
Steven Whitehousef057f6c2009-01-12 10:43:39 +00001452}
1453
David Teiglandb3b94fa2006-01-16 16:50:04 +00001454/**
David Teiglandb3b94fa2006-01-16 16:50:04 +00001455 * clear_glock - look at a glock and see if we can free it from glock cache
1456 * @gl: the glock to look at
1457 *
1458 */
1459
1460static void clear_glock(struct gfs2_glock *gl)
1461{
Steven Whitehousef42ab082011-04-14 16:50:31 +01001462 gfs2_glock_remove_from_lru(gl);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001463
Andreas Gruenbacherf3dd1642015-10-29 10:58:09 -05001464 spin_lock(&gl->gl_lockref.lock);
Steven Whitehousec741c452010-09-29 14:20:52 +01001465 if (gl->gl_state != LM_ST_UNLOCKED)
Steven Whitehouse81ffbf62013-04-10 10:26:55 +01001466 handle_callback(gl, LM_ST_UNLOCKED, 0, false);
Andreas Gruenbacherf3dd1642015-10-29 10:58:09 -05001467 spin_unlock(&gl->gl_lockref.lock);
Steven Whitehouse6802e342008-05-21 17:03:22 +01001468 if (queue_delayed_work(glock_workqueue, &gl->gl_work, 0) == 0)
1469 gfs2_glock_put(gl);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001470}
1471
1472/**
Steven Whitehousef057f6c2009-01-12 10:43:39 +00001473 * gfs2_glock_thaw - Thaw any frozen glocks
1474 * @sdp: The super block
1475 *
1476 */
1477
1478void gfs2_glock_thaw(struct gfs2_sbd *sdp)
1479{
Steven Whitehousebc015cb2011-01-19 09:30:01 +00001480 glock_hash_walk(thaw_glock, sdp);
1481}
Steven Whitehousef057f6c2009-01-12 10:43:39 +00001482
Steven Whitehouseac3beb62014-01-16 10:31:13 +00001483static void dump_glock(struct seq_file *seq, struct gfs2_glock *gl)
Steven Whitehousebc015cb2011-01-19 09:30:01 +00001484{
Andreas Gruenbacherf3dd1642015-10-29 10:58:09 -05001485 spin_lock(&gl->gl_lockref.lock);
Steven Whitehouseac3beb62014-01-16 10:31:13 +00001486 gfs2_dump_glock(seq, gl);
Andreas Gruenbacherf3dd1642015-10-29 10:58:09 -05001487 spin_unlock(&gl->gl_lockref.lock);
Steven Whitehousebc015cb2011-01-19 09:30:01 +00001488}
1489
1490static void dump_glock_func(struct gfs2_glock *gl)
1491{
1492 dump_glock(NULL, gl);
Steven Whitehousef057f6c2009-01-12 10:43:39 +00001493}
1494
1495/**
David Teiglandb3b94fa2006-01-16 16:50:04 +00001496 * gfs2_gl_hash_clear - Empty out the glock hash table
1497 * @sdp: the filesystem
1498 * @wait: wait until it's all gone
1499 *
Steven Whitehouse1bdad602008-06-03 14:09:53 +01001500 * Called when unmounting the filesystem.
David Teiglandb3b94fa2006-01-16 16:50:04 +00001501 */
1502
Steven Whitehousefefc03b2008-12-19 15:32:06 +00001503void gfs2_gl_hash_clear(struct gfs2_sbd *sdp)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001504{
David Teiglandfb6791d2012-11-13 10:58:56 -05001505 set_bit(SDF_SKIP_DLM_UNLOCK, &sdp->sd_flags);
Bob Peterson222cb532013-04-25 12:49:17 -04001506 flush_workqueue(glock_workqueue);
Steven Whitehousebc015cb2011-01-19 09:30:01 +00001507 glock_hash_walk(clear_glock, sdp);
Steven Whitehouse8f052282010-01-29 15:21:27 +00001508 flush_workqueue(glock_workqueue);
Bob Peterson2aba1b52015-05-19 09:11:23 -05001509 wait_event_timeout(sdp->sd_glock_wait,
1510 atomic_read(&sdp->sd_glock_disposal) == 0,
1511 HZ * 600);
Steven Whitehousebc015cb2011-01-19 09:30:01 +00001512 glock_hash_walk(dump_glock_func, sdp);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001513}
1514
Steven Whitehouse813e0c42008-11-18 13:38:48 +00001515void gfs2_glock_finish_truncate(struct gfs2_inode *ip)
1516{
1517 struct gfs2_glock *gl = ip->i_gl;
1518 int ret;
1519
1520 ret = gfs2_truncatei_resume(ip);
Bob Peterson15562c42015-03-16 11:52:05 -05001521 gfs2_assert_withdraw(gl->gl_name.ln_sbd, ret == 0);
Steven Whitehouse813e0c42008-11-18 13:38:48 +00001522
Andreas Gruenbacherf3dd1642015-10-29 10:58:09 -05001523 spin_lock(&gl->gl_lockref.lock);
Steven Whitehouse813e0c42008-11-18 13:38:48 +00001524 clear_bit(GLF_LOCK, &gl->gl_flags);
1525 run_queue(gl, 1);
Andreas Gruenbacherf3dd1642015-10-29 10:58:09 -05001526 spin_unlock(&gl->gl_lockref.lock);
Steven Whitehouse813e0c42008-11-18 13:38:48 +00001527}
1528
Steven Whitehouse6802e342008-05-21 17:03:22 +01001529static const char *state2str(unsigned state)
Robert Peterson04b933f2007-03-23 17:05:15 -05001530{
Steven Whitehouse6802e342008-05-21 17:03:22 +01001531 switch(state) {
1532 case LM_ST_UNLOCKED:
1533 return "UN";
1534 case LM_ST_SHARED:
1535 return "SH";
1536 case LM_ST_DEFERRED:
1537 return "DF";
1538 case LM_ST_EXCLUSIVE:
1539 return "EX";
1540 }
1541 return "??";
1542}
Robert Peterson04b933f2007-03-23 17:05:15 -05001543
Bob Petersonb58bf402015-07-24 09:45:43 -05001544static const char *hflags2str(char *buf, u16 flags, unsigned long iflags)
Steven Whitehouse6802e342008-05-21 17:03:22 +01001545{
1546 char *p = buf;
1547 if (flags & LM_FLAG_TRY)
1548 *p++ = 't';
1549 if (flags & LM_FLAG_TRY_1CB)
1550 *p++ = 'T';
1551 if (flags & LM_FLAG_NOEXP)
1552 *p++ = 'e';
1553 if (flags & LM_FLAG_ANY)
Steven Whitehousef057f6c2009-01-12 10:43:39 +00001554 *p++ = 'A';
Steven Whitehouse6802e342008-05-21 17:03:22 +01001555 if (flags & LM_FLAG_PRIORITY)
1556 *p++ = 'p';
1557 if (flags & GL_ASYNC)
1558 *p++ = 'a';
1559 if (flags & GL_EXACT)
1560 *p++ = 'E';
Steven Whitehouse6802e342008-05-21 17:03:22 +01001561 if (flags & GL_NOCACHE)
1562 *p++ = 'c';
1563 if (test_bit(HIF_HOLDER, &iflags))
1564 *p++ = 'H';
1565 if (test_bit(HIF_WAIT, &iflags))
1566 *p++ = 'W';
1567 if (test_bit(HIF_FIRST, &iflags))
1568 *p++ = 'F';
1569 *p = 0;
1570 return buf;
Robert Peterson04b933f2007-03-23 17:05:15 -05001571}
1572
David Teiglandb3b94fa2006-01-16 16:50:04 +00001573/**
1574 * dump_holder - print information about a glock holder
Steven Whitehouse6802e342008-05-21 17:03:22 +01001575 * @seq: the seq_file struct
David Teiglandb3b94fa2006-01-16 16:50:04 +00001576 * @gh: the glock holder
1577 *
David Teiglandb3b94fa2006-01-16 16:50:04 +00001578 */
1579
Steven Whitehouseac3beb62014-01-16 10:31:13 +00001580static void dump_holder(struct seq_file *seq, const struct gfs2_holder *gh)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001581{
Steven Whitehouse6802e342008-05-21 17:03:22 +01001582 struct task_struct *gh_owner = NULL;
Steven Whitehouse6802e342008-05-21 17:03:22 +01001583 char flags_buf[32];
David Teiglandb3b94fa2006-01-16 16:50:04 +00001584
Tetsuo Handa0b3a2c92014-01-02 19:52:20 +09001585 rcu_read_lock();
Steven Whitehouse6802e342008-05-21 17:03:22 +01001586 if (gh->gh_owner_pid)
Pavel Emelyanovb1e058d2008-02-07 00:13:19 -08001587 gh_owner = pid_task(gh->gh_owner_pid, PIDTYPE_PID);
Joe Perchescc181522010-11-05 16:12:36 -07001588 gfs2_print_dbg(seq, " H: s:%s f:%s e:%d p:%ld [%s] %pS\n",
1589 state2str(gh->gh_state),
1590 hflags2str(flags_buf, gh->gh_flags, gh->gh_iflags),
1591 gh->gh_error,
1592 gh->gh_owner_pid ? (long)pid_nr(gh->gh_owner_pid) : -1,
1593 gh_owner ? gh_owner->comm : "(ended)",
1594 (void *)gh->gh_ip);
Tetsuo Handa0b3a2c92014-01-02 19:52:20 +09001595 rcu_read_unlock();
David Teiglandb3b94fa2006-01-16 16:50:04 +00001596}
1597
Steven Whitehouse627c10b2011-04-14 14:09:52 +01001598static const char *gflags2str(char *buf, const struct gfs2_glock *gl)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001599{
Steven Whitehouse627c10b2011-04-14 14:09:52 +01001600 const unsigned long *gflags = &gl->gl_flags;
Steven Whitehouse6802e342008-05-21 17:03:22 +01001601 char *p = buf;
Steven Whitehouse627c10b2011-04-14 14:09:52 +01001602
Steven Whitehouse6802e342008-05-21 17:03:22 +01001603 if (test_bit(GLF_LOCK, gflags))
1604 *p++ = 'l';
Steven Whitehouse6802e342008-05-21 17:03:22 +01001605 if (test_bit(GLF_DEMOTE, gflags))
1606 *p++ = 'D';
1607 if (test_bit(GLF_PENDING_DEMOTE, gflags))
1608 *p++ = 'd';
1609 if (test_bit(GLF_DEMOTE_IN_PROGRESS, gflags))
1610 *p++ = 'p';
1611 if (test_bit(GLF_DIRTY, gflags))
1612 *p++ = 'y';
1613 if (test_bit(GLF_LFLUSH, gflags))
1614 *p++ = 'f';
1615 if (test_bit(GLF_INVALIDATE_IN_PROGRESS, gflags))
1616 *p++ = 'i';
1617 if (test_bit(GLF_REPLY_PENDING, gflags))
1618 *p++ = 'r';
Steven Whitehousef057f6c2009-01-12 10:43:39 +00001619 if (test_bit(GLF_INITIAL, gflags))
Steven Whitehoused8348de2009-02-05 10:12:38 +00001620 *p++ = 'I';
Steven Whitehousef057f6c2009-01-12 10:43:39 +00001621 if (test_bit(GLF_FROZEN, gflags))
1622 *p++ = 'F';
Steven Whitehouse7b5e3d52010-09-03 09:39:20 +01001623 if (test_bit(GLF_QUEUED, gflags))
1624 *p++ = 'q';
Steven Whitehouse627c10b2011-04-14 14:09:52 +01001625 if (test_bit(GLF_LRU, gflags))
1626 *p++ = 'L';
1627 if (gl->gl_object)
1628 *p++ = 'o';
Steven Whitehousea2457692012-01-20 10:38:36 +00001629 if (test_bit(GLF_BLOCKING, gflags))
1630 *p++ = 'b';
Steven Whitehouse6802e342008-05-21 17:03:22 +01001631 *p = 0;
1632 return buf;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001633}
1634
1635/**
Steven Whitehouse8eae1ca2012-10-15 10:57:02 +01001636 * gfs2_dump_glock - print information about a glock
Steven Whitehouse6802e342008-05-21 17:03:22 +01001637 * @seq: The seq_file struct
David Teiglandb3b94fa2006-01-16 16:50:04 +00001638 * @gl: the glock
Steven Whitehouse6802e342008-05-21 17:03:22 +01001639 *
1640 * The file format is as follows:
1641 * One line per object, capital letters are used to indicate objects
1642 * G = glock, I = Inode, R = rgrp, H = holder. Glocks are not indented,
1643 * other objects are indented by a single space and follow the glock to
1644 * which they are related. Fields are indicated by lower case letters
1645 * followed by a colon and the field value, except for strings which are in
1646 * [] so that its possible to see if they are composed of spaces for
1647 * example. The field's are n = number (id of the object), f = flags,
1648 * t = type, s = state, r = refcount, e = error, p = pid.
David Teiglandb3b94fa2006-01-16 16:50:04 +00001649 *
David Teiglandb3b94fa2006-01-16 16:50:04 +00001650 */
1651
Steven Whitehouseac3beb62014-01-16 10:31:13 +00001652void gfs2_dump_glock(struct seq_file *seq, const struct gfs2_glock *gl)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001653{
Steven Whitehouse6802e342008-05-21 17:03:22 +01001654 const struct gfs2_glock_operations *glops = gl->gl_ops;
1655 unsigned long long dtime;
1656 const struct gfs2_holder *gh;
1657 char gflags_buf[32];
David Teiglandb3b94fa2006-01-16 16:50:04 +00001658
Steven Whitehouse6802e342008-05-21 17:03:22 +01001659 dtime = jiffies - gl->gl_demote_time;
1660 dtime *= 1000000/HZ; /* demote time in uSec */
1661 if (!test_bit(GLF_DEMOTE, &gl->gl_flags))
1662 dtime = 0;
Bob Peterson7cf8dcd2011-06-15 11:41:48 -04001663 gfs2_print_dbg(seq, "G: s:%s n:%u/%llx f:%s t:%s d:%s/%llu a:%d v:%d r:%d m:%ld\n",
Steven Whitehouse6802e342008-05-21 17:03:22 +01001664 state2str(gl->gl_state),
1665 gl->gl_name.ln_type,
1666 (unsigned long long)gl->gl_name.ln_number,
Steven Whitehouse627c10b2011-04-14 14:09:52 +01001667 gflags2str(gflags_buf, gl),
Steven Whitehouse6802e342008-05-21 17:03:22 +01001668 state2str(gl->gl_target),
1669 state2str(gl->gl_demote_state), dtime,
Steven Whitehouse6802e342008-05-21 17:03:22 +01001670 atomic_read(&gl->gl_ail_count),
Steven Whitehousef42ab082011-04-14 16:50:31 +01001671 atomic_read(&gl->gl_revokes),
Steven Whitehousee66cf162013-10-15 15:18:08 +01001672 (int)gl->gl_lockref.count, gl->gl_hold_time);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001673
Steven Whitehouseac3beb62014-01-16 10:31:13 +00001674 list_for_each_entry(gh, &gl->gl_holders, gh_list)
1675 dump_holder(seq, gh);
1676
Steven Whitehouse6802e342008-05-21 17:03:22 +01001677 if (gl->gl_state != LM_ST_UNLOCKED && glops->go_dump)
Steven Whitehouseac3beb62014-01-16 10:31:13 +00001678 glops->go_dump(seq, gl);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001679}
1680
Steven Whitehousea2457692012-01-20 10:38:36 +00001681static int gfs2_glstats_seq_show(struct seq_file *seq, void *iter_ptr)
1682{
1683 struct gfs2_glock *gl = iter_ptr;
Steven Whitehouse6802e342008-05-21 17:03:22 +01001684
Ben Hutchings4d207132015-08-27 12:51:45 -05001685 seq_printf(seq, "G: n:%u/%llx rtt:%llu/%llu rttb:%llu/%llu irt:%llu/%llu dcnt: %llu qcnt: %llu\n",
Steven Whitehousea2457692012-01-20 10:38:36 +00001686 gl->gl_name.ln_type,
1687 (unsigned long long)gl->gl_name.ln_number,
Ben Hutchings4d207132015-08-27 12:51:45 -05001688 (unsigned long long)gl->gl_stats.stats[GFS2_LKS_SRTT],
1689 (unsigned long long)gl->gl_stats.stats[GFS2_LKS_SRTTVAR],
1690 (unsigned long long)gl->gl_stats.stats[GFS2_LKS_SRTTB],
1691 (unsigned long long)gl->gl_stats.stats[GFS2_LKS_SRTTVARB],
1692 (unsigned long long)gl->gl_stats.stats[GFS2_LKS_SIRT],
1693 (unsigned long long)gl->gl_stats.stats[GFS2_LKS_SIRTVAR],
1694 (unsigned long long)gl->gl_stats.stats[GFS2_LKS_DCOUNT],
1695 (unsigned long long)gl->gl_stats.stats[GFS2_LKS_QCOUNT]);
Steven Whitehousea2457692012-01-20 10:38:36 +00001696 return 0;
1697}
David Teiglandb3b94fa2006-01-16 16:50:04 +00001698
Steven Whitehousea2457692012-01-20 10:38:36 +00001699static const char *gfs2_gltype[] = {
1700 "type",
1701 "reserved",
1702 "nondisk",
1703 "inode",
1704 "rgrp",
1705 "meta",
1706 "iopen",
1707 "flock",
1708 "plock",
1709 "quota",
1710 "journal",
1711};
1712
1713static const char *gfs2_stype[] = {
1714 [GFS2_LKS_SRTT] = "srtt",
1715 [GFS2_LKS_SRTTVAR] = "srttvar",
1716 [GFS2_LKS_SRTTB] = "srttb",
1717 [GFS2_LKS_SRTTVARB] = "srttvarb",
1718 [GFS2_LKS_SIRT] = "sirt",
1719 [GFS2_LKS_SIRTVAR] = "sirtvar",
1720 [GFS2_LKS_DCOUNT] = "dlm",
1721 [GFS2_LKS_QCOUNT] = "queue",
1722};
1723
1724#define GFS2_NR_SBSTATS (ARRAY_SIZE(gfs2_gltype) * ARRAY_SIZE(gfs2_stype))
1725
1726static int gfs2_sbstats_seq_show(struct seq_file *seq, void *iter_ptr)
1727{
Andreas Gruenbacher81648d02015-08-27 11:43:00 -05001728 struct gfs2_sbd *sdp = seq->private;
1729 loff_t pos = *(loff_t *)iter_ptr;
1730 unsigned index = pos >> 3;
1731 unsigned subindex = pos & 0x07;
Steven Whitehousea2457692012-01-20 10:38:36 +00001732 int i;
1733
1734 if (index == 0 && subindex != 0)
1735 return 0;
1736
1737 seq_printf(seq, "%-10s %8s:", gfs2_gltype[index],
1738 (index == 0) ? "cpu": gfs2_stype[subindex]);
1739
1740 for_each_possible_cpu(i) {
1741 const struct gfs2_pcpu_lkstats *lkstats = per_cpu_ptr(sdp->sd_lkstats, i);
Andreas Gruenbacher8f7e0a82015-08-27 13:02:54 -05001742
1743 if (index == 0)
1744 seq_printf(seq, " %15u", i);
1745 else
1746 seq_printf(seq, " %15llu", (unsigned long long)lkstats->
1747 lkstats[index - 1].stats[subindex]);
Steven Whitehousea2457692012-01-20 10:38:36 +00001748 }
1749 seq_putc(seq, '\n');
1750 return 0;
1751}
Steven Whitehouse8fbbfd22007-08-01 13:57:10 +01001752
Steven Whitehouse85d1da62006-09-07 14:40:21 -04001753int __init gfs2_glock_init(void)
1754{
Bob Peterson88ffbf32015-03-16 11:02:46 -05001755 int ret;
1756
1757 ret = rhashtable_init(&gl_hash_table, &ht_parms);
1758 if (ret < 0)
1759 return ret;
Steven Whitehouse8fbbfd22007-08-01 13:57:10 +01001760
Steven Whitehoused2115772010-11-03 19:58:53 +00001761 glock_workqueue = alloc_workqueue("glock_workqueue", WQ_MEM_RECLAIM |
Tejun Heo58a69cb2011-02-16 09:25:31 +01001762 WQ_HIGHPRI | WQ_FREEZABLE, 0);
Bob Peterson88ffbf32015-03-16 11:02:46 -05001763 if (!glock_workqueue) {
1764 rhashtable_destroy(&gl_hash_table);
Dan Carpenterdfc46162013-08-15 10:54:43 +03001765 return -ENOMEM;
Bob Peterson88ffbf32015-03-16 11:02:46 -05001766 }
Steven Whitehoused2115772010-11-03 19:58:53 +00001767 gfs2_delete_workqueue = alloc_workqueue("delete_workqueue",
Tejun Heo58a69cb2011-02-16 09:25:31 +01001768 WQ_MEM_RECLAIM | WQ_FREEZABLE,
Steven Whitehoused2115772010-11-03 19:58:53 +00001769 0);
Dan Carpenterdfc46162013-08-15 10:54:43 +03001770 if (!gfs2_delete_workqueue) {
Benjamin Marzinskib94a1702009-07-23 18:52:34 -05001771 destroy_workqueue(glock_workqueue);
Bob Peterson88ffbf32015-03-16 11:02:46 -05001772 rhashtable_destroy(&gl_hash_table);
Dan Carpenterdfc46162013-08-15 10:54:43 +03001773 return -ENOMEM;
Benjamin Marzinskib94a1702009-07-23 18:52:34 -05001774 }
Steven Whitehouse97cc1022008-11-20 13:39:47 +00001775
1776 register_shrinker(&glock_shrinker);
Benjamin Marzinskic4f68a12007-08-23 13:19:05 -05001777
Steven Whitehouse85d1da62006-09-07 14:40:21 -04001778 return 0;
1779}
1780
Steven Whitehouse8fbbfd22007-08-01 13:57:10 +01001781void gfs2_glock_exit(void)
1782{
Steven Whitehouse97cc1022008-11-20 13:39:47 +00001783 unregister_shrinker(&glock_shrinker);
Bob Peterson88ffbf32015-03-16 11:02:46 -05001784 rhashtable_destroy(&gl_hash_table);
Benjamin Marzinskic4f68a12007-08-23 13:19:05 -05001785 destroy_workqueue(glock_workqueue);
Benjamin Marzinskib94a1702009-07-23 18:52:34 -05001786 destroy_workqueue(gfs2_delete_workqueue);
Steven Whitehouse8fbbfd22007-08-01 13:57:10 +01001787}
1788
Bob Peterson88ffbf32015-03-16 11:02:46 -05001789static void gfs2_glock_iter_next(struct gfs2_glock_iter *gi)
Steven Whitehousebc015cb2011-01-19 09:30:01 +00001790{
Steven Whitehousebc015cb2011-01-19 09:30:01 +00001791 do {
Bob Peterson88ffbf32015-03-16 11:02:46 -05001792 gi->gl = rhashtable_walk_next(&gi->hti);
1793 if (IS_ERR(gi->gl)) {
1794 if (PTR_ERR(gi->gl) == -EAGAIN)
1795 continue;
1796 gi->gl = NULL;
Steven Whitehousebc015cb2011-01-19 09:30:01 +00001797 }
1798 /* Skip entries for other sb and dead entries */
Bob Peterson88ffbf32015-03-16 11:02:46 -05001799 } while ((gi->gl) && ((gi->sdp != gi->gl->gl_name.ln_sbd) ||
1800 __lockref_is_dead(&gi->gl->gl_lockref)));
Robert Peterson7c52b162007-03-16 10:26:37 +00001801}
1802
Steven Whitehouse6802e342008-05-21 17:03:22 +01001803static void *gfs2_glock_seq_start(struct seq_file *seq, loff_t *pos)
Robert Peterson7c52b162007-03-16 10:26:37 +00001804{
Steven Whitehouse6802e342008-05-21 17:03:22 +01001805 struct gfs2_glock_iter *gi = seq->private;
Robert Peterson7c52b162007-03-16 10:26:37 +00001806 loff_t n = *pos;
Bob Peterson88ffbf32015-03-16 11:02:46 -05001807 int ret;
Robert Peterson7c52b162007-03-16 10:26:37 +00001808
Steven Whitehouseba1ddcb2012-06-08 11:16:22 +01001809 if (gi->last_pos <= *pos)
Bob Peterson88ffbf32015-03-16 11:02:46 -05001810 n = (*pos - gi->last_pos);
Steven Whitehouseba1ddcb2012-06-08 11:16:22 +01001811
Bob Peterson88ffbf32015-03-16 11:02:46 -05001812 ret = rhashtable_walk_start(&gi->hti);
1813 if (ret)
1814 return NULL;
Robert Peterson7c52b162007-03-16 10:26:37 +00001815
Steven Whitehouse6802e342008-05-21 17:03:22 +01001816 do {
Bob Peterson88ffbf32015-03-16 11:02:46 -05001817 gfs2_glock_iter_next(gi);
1818 } while (gi->gl && n--);
Robert Peterson7c52b162007-03-16 10:26:37 +00001819
Steven Whitehouseba1ddcb2012-06-08 11:16:22 +01001820 gi->last_pos = *pos;
Steven Whitehouse6802e342008-05-21 17:03:22 +01001821 return gi->gl;
Robert Peterson7c52b162007-03-16 10:26:37 +00001822}
1823
Steven Whitehouse6802e342008-05-21 17:03:22 +01001824static void *gfs2_glock_seq_next(struct seq_file *seq, void *iter_ptr,
Robert Peterson7c52b162007-03-16 10:26:37 +00001825 loff_t *pos)
1826{
Steven Whitehouse6802e342008-05-21 17:03:22 +01001827 struct gfs2_glock_iter *gi = seq->private;
Robert Peterson7c52b162007-03-16 10:26:37 +00001828
1829 (*pos)++;
Steven Whitehouseba1ddcb2012-06-08 11:16:22 +01001830 gi->last_pos = *pos;
Bob Peterson88ffbf32015-03-16 11:02:46 -05001831 gfs2_glock_iter_next(gi);
Steven Whitehouse6802e342008-05-21 17:03:22 +01001832 return gi->gl;
Robert Peterson7c52b162007-03-16 10:26:37 +00001833}
1834
Steven Whitehouse6802e342008-05-21 17:03:22 +01001835static void gfs2_glock_seq_stop(struct seq_file *seq, void *iter_ptr)
Robert Peterson7c52b162007-03-16 10:26:37 +00001836{
Steven Whitehouse6802e342008-05-21 17:03:22 +01001837 struct gfs2_glock_iter *gi = seq->private;
Steven Whitehousebc015cb2011-01-19 09:30:01 +00001838
Steven Whitehousebc015cb2011-01-19 09:30:01 +00001839 gi->gl = NULL;
Bob Peterson88ffbf32015-03-16 11:02:46 -05001840 rhashtable_walk_stop(&gi->hti);
Robert Peterson7c52b162007-03-16 10:26:37 +00001841}
1842
Steven Whitehouse6802e342008-05-21 17:03:22 +01001843static int gfs2_glock_seq_show(struct seq_file *seq, void *iter_ptr)
Robert Peterson7c52b162007-03-16 10:26:37 +00001844{
Steven Whitehouseac3beb62014-01-16 10:31:13 +00001845 dump_glock(seq, iter_ptr);
1846 return 0;
Robert Peterson7c52b162007-03-16 10:26:37 +00001847}
1848
Steven Whitehousea2457692012-01-20 10:38:36 +00001849static void *gfs2_sbstats_seq_start(struct seq_file *seq, loff_t *pos)
1850{
Andreas Gruenbacher81648d02015-08-27 11:43:00 -05001851 preempt_disable();
Steven Whitehousea2457692012-01-20 10:38:36 +00001852 if (*pos >= GFS2_NR_SBSTATS)
1853 return NULL;
Andreas Gruenbacher81648d02015-08-27 11:43:00 -05001854 return pos;
Steven Whitehousea2457692012-01-20 10:38:36 +00001855}
1856
1857static void *gfs2_sbstats_seq_next(struct seq_file *seq, void *iter_ptr,
1858 loff_t *pos)
1859{
Steven Whitehousea2457692012-01-20 10:38:36 +00001860 (*pos)++;
Andreas Gruenbacher81648d02015-08-27 11:43:00 -05001861 if (*pos >= GFS2_NR_SBSTATS)
Steven Whitehousea2457692012-01-20 10:38:36 +00001862 return NULL;
Andreas Gruenbacher81648d02015-08-27 11:43:00 -05001863 return pos;
Steven Whitehousea2457692012-01-20 10:38:36 +00001864}
1865
1866static void gfs2_sbstats_seq_stop(struct seq_file *seq, void *iter_ptr)
1867{
1868 preempt_enable();
1869}
1870
Denis Cheng4ef29002007-07-31 18:31:11 +08001871static const struct seq_operations gfs2_glock_seq_ops = {
Robert Peterson7c52b162007-03-16 10:26:37 +00001872 .start = gfs2_glock_seq_start,
1873 .next = gfs2_glock_seq_next,
1874 .stop = gfs2_glock_seq_stop,
1875 .show = gfs2_glock_seq_show,
1876};
1877
Steven Whitehousea2457692012-01-20 10:38:36 +00001878static const struct seq_operations gfs2_glstats_seq_ops = {
1879 .start = gfs2_glock_seq_start,
1880 .next = gfs2_glock_seq_next,
1881 .stop = gfs2_glock_seq_stop,
1882 .show = gfs2_glstats_seq_show,
1883};
1884
1885static const struct seq_operations gfs2_sbstats_seq_ops = {
1886 .start = gfs2_sbstats_seq_start,
1887 .next = gfs2_sbstats_seq_next,
1888 .stop = gfs2_sbstats_seq_stop,
1889 .show = gfs2_sbstats_seq_show,
1890};
1891
Steven Whitehouse0fe2f1e2012-06-11 13:49:47 +01001892#define GFS2_SEQ_GOODSIZE min(PAGE_SIZE << PAGE_ALLOC_COSTLY_ORDER, 65536UL)
1893
Steven Whitehousea2457692012-01-20 10:38:36 +00001894static int gfs2_glocks_open(struct inode *inode, struct file *file)
Robert Peterson7c52b162007-03-16 10:26:37 +00001895{
Steven Whitehouse6802e342008-05-21 17:03:22 +01001896 int ret = seq_open_private(file, &gfs2_glock_seq_ops,
1897 sizeof(struct gfs2_glock_iter));
1898 if (ret == 0) {
1899 struct seq_file *seq = file->private_data;
1900 struct gfs2_glock_iter *gi = seq->private;
Bob Peterson88ffbf32015-03-16 11:02:46 -05001901
Steven Whitehouse6802e342008-05-21 17:03:22 +01001902 gi->sdp = inode->i_private;
Bob Peterson88ffbf32015-03-16 11:02:46 -05001903 gi->last_pos = 0;
Steven Whitehouse0fe2f1e2012-06-11 13:49:47 +01001904 seq->buf = kmalloc(GFS2_SEQ_GOODSIZE, GFP_KERNEL | __GFP_NOWARN);
Steven Whitehousedf5d2f52012-06-07 13:30:16 +01001905 if (seq->buf)
Steven Whitehouse0fe2f1e2012-06-11 13:49:47 +01001906 seq->size = GFS2_SEQ_GOODSIZE;
Bob Peterson88ffbf32015-03-16 11:02:46 -05001907 gi->gl = NULL;
1908 ret = rhashtable_walk_init(&gl_hash_table, &gi->hti);
Steven Whitehouse6802e342008-05-21 17:03:22 +01001909 }
1910 return ret;
Robert Peterson7c52b162007-03-16 10:26:37 +00001911}
1912
Bob Peterson88ffbf32015-03-16 11:02:46 -05001913static int gfs2_glocks_release(struct inode *inode, struct file *file)
1914{
1915 struct seq_file *seq = file->private_data;
1916 struct gfs2_glock_iter *gi = seq->private;
1917
1918 gi->gl = NULL;
1919 rhashtable_walk_exit(&gi->hti);
1920 return seq_release_private(inode, file);
1921}
1922
Steven Whitehousea2457692012-01-20 10:38:36 +00001923static int gfs2_glstats_open(struct inode *inode, struct file *file)
1924{
1925 int ret = seq_open_private(file, &gfs2_glstats_seq_ops,
1926 sizeof(struct gfs2_glock_iter));
1927 if (ret == 0) {
1928 struct seq_file *seq = file->private_data;
1929 struct gfs2_glock_iter *gi = seq->private;
1930 gi->sdp = inode->i_private;
Bob Peterson88ffbf32015-03-16 11:02:46 -05001931 gi->last_pos = 0;
Steven Whitehouse0fe2f1e2012-06-11 13:49:47 +01001932 seq->buf = kmalloc(GFS2_SEQ_GOODSIZE, GFP_KERNEL | __GFP_NOWARN);
Steven Whitehousedf5d2f52012-06-07 13:30:16 +01001933 if (seq->buf)
Steven Whitehouse0fe2f1e2012-06-11 13:49:47 +01001934 seq->size = GFS2_SEQ_GOODSIZE;
Bob Peterson88ffbf32015-03-16 11:02:46 -05001935 gi->gl = NULL;
1936 ret = rhashtable_walk_init(&gl_hash_table, &gi->hti);
Steven Whitehousea2457692012-01-20 10:38:36 +00001937 }
1938 return ret;
1939}
1940
1941static int gfs2_sbstats_open(struct inode *inode, struct file *file)
1942{
Andreas Gruenbacher81648d02015-08-27 11:43:00 -05001943 int ret = seq_open(file, &gfs2_sbstats_seq_ops);
Steven Whitehousea2457692012-01-20 10:38:36 +00001944 if (ret == 0) {
1945 struct seq_file *seq = file->private_data;
Andreas Gruenbacher81648d02015-08-27 11:43:00 -05001946 seq->private = inode->i_private; /* sdp */
Steven Whitehousea2457692012-01-20 10:38:36 +00001947 }
1948 return ret;
1949}
1950
1951static const struct file_operations gfs2_glocks_fops = {
Robert Peterson7c52b162007-03-16 10:26:37 +00001952 .owner = THIS_MODULE,
Steven Whitehousea2457692012-01-20 10:38:36 +00001953 .open = gfs2_glocks_open,
1954 .read = seq_read,
1955 .llseek = seq_lseek,
Bob Peterson88ffbf32015-03-16 11:02:46 -05001956 .release = gfs2_glocks_release,
Steven Whitehousea2457692012-01-20 10:38:36 +00001957};
1958
1959static const struct file_operations gfs2_glstats_fops = {
1960 .owner = THIS_MODULE,
1961 .open = gfs2_glstats_open,
1962 .read = seq_read,
1963 .llseek = seq_lseek,
Bob Peterson88ffbf32015-03-16 11:02:46 -05001964 .release = gfs2_glocks_release,
Steven Whitehousea2457692012-01-20 10:38:36 +00001965};
1966
1967static const struct file_operations gfs2_sbstats_fops = {
1968 .owner = THIS_MODULE,
1969 .open = gfs2_sbstats_open,
Robert Peterson7c52b162007-03-16 10:26:37 +00001970 .read = seq_read,
1971 .llseek = seq_lseek,
Andreas Gruenbacher81648d02015-08-27 11:43:00 -05001972 .release = seq_release,
Robert Peterson7c52b162007-03-16 10:26:37 +00001973};
1974
1975int gfs2_create_debugfs_file(struct gfs2_sbd *sdp)
1976{
Chengyu Song7b4ddfa2015-03-24 09:37:53 -05001977 struct dentry *dent;
Steven Whitehousea2457692012-01-20 10:38:36 +00001978
Chengyu Song7b4ddfa2015-03-24 09:37:53 -05001979 dent = debugfs_create_dir(sdp->sd_table_name, gfs2_root);
1980 if (IS_ERR_OR_NULL(dent))
Steven Whitehousea2457692012-01-20 10:38:36 +00001981 goto fail;
Chengyu Song7b4ddfa2015-03-24 09:37:53 -05001982 sdp->debugfs_dir = dent;
Steven Whitehousea2457692012-01-20 10:38:36 +00001983
Chengyu Song7b4ddfa2015-03-24 09:37:53 -05001984 dent = debugfs_create_file("glocks",
1985 S_IFREG | S_IRUGO,
1986 sdp->debugfs_dir, sdp,
1987 &gfs2_glocks_fops);
1988 if (IS_ERR_OR_NULL(dent))
Steven Whitehousea2457692012-01-20 10:38:36 +00001989 goto fail;
Chengyu Song7b4ddfa2015-03-24 09:37:53 -05001990 sdp->debugfs_dentry_glocks = dent;
1991
1992 dent = debugfs_create_file("glstats",
1993 S_IFREG | S_IRUGO,
1994 sdp->debugfs_dir, sdp,
1995 &gfs2_glstats_fops);
1996 if (IS_ERR_OR_NULL(dent))
1997 goto fail;
1998 sdp->debugfs_dentry_glstats = dent;
1999
2000 dent = debugfs_create_file("sbstats",
2001 S_IFREG | S_IRUGO,
2002 sdp->debugfs_dir, sdp,
2003 &gfs2_sbstats_fops);
2004 if (IS_ERR_OR_NULL(dent))
2005 goto fail;
2006 sdp->debugfs_dentry_sbstats = dent;
Robert Peterson7c52b162007-03-16 10:26:37 +00002007
2008 return 0;
Steven Whitehousea2457692012-01-20 10:38:36 +00002009fail:
2010 gfs2_delete_debugfs_file(sdp);
Chengyu Song7b4ddfa2015-03-24 09:37:53 -05002011 return dent ? PTR_ERR(dent) : -ENOMEM;
Robert Peterson7c52b162007-03-16 10:26:37 +00002012}
2013
2014void gfs2_delete_debugfs_file(struct gfs2_sbd *sdp)
2015{
Steven Whitehousea2457692012-01-20 10:38:36 +00002016 if (sdp->debugfs_dir) {
Robert Peterson5f882092007-04-18 11:41:11 -05002017 if (sdp->debugfs_dentry_glocks) {
2018 debugfs_remove(sdp->debugfs_dentry_glocks);
2019 sdp->debugfs_dentry_glocks = NULL;
2020 }
Steven Whitehousea2457692012-01-20 10:38:36 +00002021 if (sdp->debugfs_dentry_glstats) {
2022 debugfs_remove(sdp->debugfs_dentry_glstats);
2023 sdp->debugfs_dentry_glstats = NULL;
2024 }
2025 if (sdp->debugfs_dentry_sbstats) {
2026 debugfs_remove(sdp->debugfs_dentry_sbstats);
2027 sdp->debugfs_dentry_sbstats = NULL;
2028 }
Robert Peterson5f882092007-04-18 11:41:11 -05002029 debugfs_remove(sdp->debugfs_dir);
2030 sdp->debugfs_dir = NULL;
2031 }
Robert Peterson7c52b162007-03-16 10:26:37 +00002032}
2033
2034int gfs2_register_debugfs(void)
2035{
2036 gfs2_root = debugfs_create_dir("gfs2", NULL);
Chengyu Song7b4ddfa2015-03-24 09:37:53 -05002037 if (IS_ERR(gfs2_root))
2038 return PTR_ERR(gfs2_root);
Robert Peterson7c52b162007-03-16 10:26:37 +00002039 return gfs2_root ? 0 : -ENOMEM;
2040}
2041
2042void gfs2_unregister_debugfs(void)
2043{
2044 debugfs_remove(gfs2_root);
Robert Peterson5f882092007-04-18 11:41:11 -05002045 gfs2_root = NULL;
Robert Peterson7c52b162007-03-16 10:26:37 +00002046}