blob: 1c423af04c69e330fb671b0a36a2675a8ebc8466 [file] [log] [blame]
Mark Fashehccd979b2005-12-15 14:31:24 -08001/* -*- mode: c; c-basic-offset: 8; -*-
2 * vim: noexpandtab sw=8 ts=8 sts=0:
3 *
4 * dlmglue.c
5 *
6 * Code which implements an OCFS2 specific interface to our DLM.
7 *
8 * Copyright (C) 2003, 2004 Oracle. All rights reserved.
9 *
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public
12 * License as published by the Free Software Foundation; either
13 * version 2 of the License, or (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 * General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public
21 * License along with this program; if not, write to the
22 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
23 * Boston, MA 021110-1307, USA.
24 */
25
26#include <linux/types.h>
27#include <linux/slab.h>
28#include <linux/highmem.h>
29#include <linux/mm.h>
Mark Fashehccd979b2005-12-15 14:31:24 -080030#include <linux/kthread.h>
31#include <linux/pagemap.h>
32#include <linux/debugfs.h>
33#include <linux/seq_file.h>
Sunil Mushran8ddb7b02008-05-13 13:45:15 -070034#include <linux/time.h>
Jan Kara9e33d692008-08-25 19:56:50 +020035#include <linux/quotaops.h>
Mark Fashehccd979b2005-12-15 14:31:24 -080036
Mark Fashehccd979b2005-12-15 14:31:24 -080037#define MLOG_MASK_PREFIX ML_DLM_GLUE
38#include <cluster/masklog.h>
39
40#include "ocfs2.h"
Joel Beckerd24fbcd2008-01-25 17:02:21 -080041#include "ocfs2_lockingver.h"
Mark Fashehccd979b2005-12-15 14:31:24 -080042
43#include "alloc.h"
Mark Fashehd680efe2006-09-08 14:14:34 -070044#include "dcache.h"
Mark Fashehccd979b2005-12-15 14:31:24 -080045#include "dlmglue.h"
46#include "extent_map.h"
Tiger Yang7f1a37e2006-11-15 15:48:42 +080047#include "file.h"
Mark Fashehccd979b2005-12-15 14:31:24 -080048#include "heartbeat.h"
49#include "inode.h"
50#include "journal.h"
Joel Becker24ef1812008-01-29 17:37:32 -080051#include "stackglue.h"
Mark Fashehccd979b2005-12-15 14:31:24 -080052#include "slot_map.h"
53#include "super.h"
54#include "uptodate.h"
Jan Kara9e33d692008-08-25 19:56:50 +020055#include "quota.h"
Tao Ma8dec98e2009-08-18 11:19:58 +080056#include "refcounttree.h"
Mark Fashehccd979b2005-12-15 14:31:24 -080057
58#include "buffer_head_io.h"
59
60struct ocfs2_mask_waiter {
61 struct list_head mw_item;
62 int mw_status;
63 struct completion mw_complete;
64 unsigned long mw_mask;
65 unsigned long mw_goal;
Sunil Mushran8ddb7b02008-05-13 13:45:15 -070066#ifdef CONFIG_OCFS2_FS_STATS
Sunil Mushran5bc970e2010-12-28 23:26:03 -080067 ktime_t mw_lock_start;
Sunil Mushran8ddb7b02008-05-13 13:45:15 -070068#endif
Mark Fashehccd979b2005-12-15 14:31:24 -080069};
70
Mark Fasheh54a7e752006-09-12 21:49:13 -070071static struct ocfs2_super *ocfs2_get_dentry_osb(struct ocfs2_lock_res *lockres);
72static struct ocfs2_super *ocfs2_get_inode_osb(struct ocfs2_lock_res *lockres);
Mark Fashehcf8e06f2007-12-20 16:43:10 -080073static struct ocfs2_super *ocfs2_get_file_osb(struct ocfs2_lock_res *lockres);
Jan Kara9e33d692008-08-25 19:56:50 +020074static struct ocfs2_super *ocfs2_get_qinfo_osb(struct ocfs2_lock_res *lockres);
Mark Fashehccd979b2005-12-15 14:31:24 -080075
Mark Fashehd680efe2006-09-08 14:14:34 -070076/*
Mark Fashehcc567d82006-09-13 21:52:21 -070077 * Return value from ->downconvert_worker functions.
Mark Fashehd680efe2006-09-08 14:14:34 -070078 *
Mark Fashehb5e500e2006-09-13 22:01:16 -070079 * These control the precise actions of ocfs2_unblock_lock()
Mark Fashehd680efe2006-09-08 14:14:34 -070080 * and ocfs2_process_blocked_lock()
81 *
82 */
83enum ocfs2_unblock_action {
84 UNBLOCK_CONTINUE = 0, /* Continue downconvert */
85 UNBLOCK_CONTINUE_POST = 1, /* Continue downconvert, fire
86 * ->post_unlock callback */
87 UNBLOCK_STOP_POST = 2, /* Do not downconvert, fire
88 * ->post_unlock() callback. */
89};
90
91struct ocfs2_unblock_ctl {
92 int requeue;
93 enum ocfs2_unblock_action unblock_action;
94};
95
Jan Karacb257972009-06-04 15:26:50 +020096/* Lockdep class keys */
97struct lock_class_key lockdep_keys[OCFS2_NUM_LOCK_TYPES];
98
Mark Fasheh810d5ae2006-09-13 21:39:52 -070099static int ocfs2_check_meta_downconvert(struct ocfs2_lock_res *lockres,
100 int new_level);
101static void ocfs2_set_meta_lvb(struct ocfs2_lock_res *lockres);
102
Mark Fashehcc567d82006-09-13 21:52:21 -0700103static int ocfs2_data_convert_worker(struct ocfs2_lock_res *lockres,
104 int blocking);
105
Mark Fashehcc567d82006-09-13 21:52:21 -0700106static int ocfs2_dentry_convert_worker(struct ocfs2_lock_res *lockres,
107 int blocking);
Mark Fashehd680efe2006-09-08 14:14:34 -0700108
109static void ocfs2_dentry_post_unlock(struct ocfs2_super *osb,
110 struct ocfs2_lock_res *lockres);
Mark Fashehccd979b2005-12-15 14:31:24 -0800111
Jan Kara9e33d692008-08-25 19:56:50 +0200112static void ocfs2_set_qinfo_lvb(struct ocfs2_lock_res *lockres);
Adrian Bunk6cb129f2007-04-26 00:29:35 -0700113
Tao Ma8dec98e2009-08-18 11:19:58 +0800114static int ocfs2_check_refcount_downconvert(struct ocfs2_lock_res *lockres,
115 int new_level);
116static int ocfs2_refcount_convert_worker(struct ocfs2_lock_res *lockres,
117 int blocking);
118
Adrian Bunk6cb129f2007-04-26 00:29:35 -0700119#define mlog_meta_lvb(__level, __lockres) ocfs2_dump_meta_lvb_info(__level, __PRETTY_FUNCTION__, __LINE__, __lockres)
120
121/* This aids in debugging situations where a bad LVB might be involved. */
122static void ocfs2_dump_meta_lvb_info(u64 level,
123 const char *function,
124 unsigned int line,
125 struct ocfs2_lock_res *lockres)
126{
Mark Fasheha641dc22008-12-24 16:03:48 -0800127 struct ocfs2_meta_lvb *lvb = ocfs2_dlm_lvb(&lockres->l_lksb);
Adrian Bunk6cb129f2007-04-26 00:29:35 -0700128
129 mlog(level, "LVB information for %s (called from %s:%u):\n",
130 lockres->l_name, function, line);
131 mlog(level, "version: %u, clusters: %u, generation: 0x%x\n",
132 lvb->lvb_version, be32_to_cpu(lvb->lvb_iclusters),
133 be32_to_cpu(lvb->lvb_igeneration));
134 mlog(level, "size: %llu, uid %u, gid %u, mode 0x%x\n",
135 (unsigned long long)be64_to_cpu(lvb->lvb_isize),
136 be32_to_cpu(lvb->lvb_iuid), be32_to_cpu(lvb->lvb_igid),
137 be16_to_cpu(lvb->lvb_imode));
138 mlog(level, "nlink %u, atime_packed 0x%llx, ctime_packed 0x%llx, "
139 "mtime_packed 0x%llx iattr 0x%x\n", be16_to_cpu(lvb->lvb_inlink),
140 (long long)be64_to_cpu(lvb->lvb_iatime_packed),
141 (long long)be64_to_cpu(lvb->lvb_ictime_packed),
142 (long long)be64_to_cpu(lvb->lvb_imtime_packed),
143 be32_to_cpu(lvb->lvb_iattr));
144}
145
146
Mark Fashehf625c972006-09-12 21:24:53 -0700147/*
148 * OCFS2 Lock Resource Operations
149 *
150 * These fine tune the behavior of the generic dlmglue locking infrastructure.
Mark Fasheh0d5dc6c2006-09-14 14:44:51 -0700151 *
152 * The most basic of lock types can point ->l_priv to their respective
153 * struct ocfs2_super and allow the default actions to manage things.
154 *
155 * Right now, each lock type also needs to implement an init function,
156 * and trivial lock/unlock wrappers. ocfs2_simple_drop_lockres()
157 * should be called when the lock is no longer needed (i.e., object
158 * destruction time).
Mark Fashehf625c972006-09-12 21:24:53 -0700159 */
Mark Fashehccd979b2005-12-15 14:31:24 -0800160struct ocfs2_lock_res_ops {
Mark Fasheh54a7e752006-09-12 21:49:13 -0700161 /*
162 * Translate an ocfs2_lock_res * into an ocfs2_super *. Define
163 * this callback if ->l_priv is not an ocfs2_super pointer
164 */
165 struct ocfs2_super * (*get_osb)(struct ocfs2_lock_res *);
Mark Fashehb5e500e2006-09-13 22:01:16 -0700166
Mark Fasheh0d5dc6c2006-09-14 14:44:51 -0700167 /*
Mark Fasheh34d024f2007-09-24 15:56:19 -0700168 * Optionally called in the downconvert thread after a
169 * successful downconvert. The lockres will not be referenced
170 * after this callback is called, so it is safe to free
171 * memory, etc.
Mark Fasheh0d5dc6c2006-09-14 14:44:51 -0700172 *
173 * The exact semantics of when this is called are controlled
174 * by ->downconvert_worker()
175 */
Mark Fashehd680efe2006-09-08 14:14:34 -0700176 void (*post_unlock)(struct ocfs2_super *, struct ocfs2_lock_res *);
Mark Fashehf625c972006-09-12 21:24:53 -0700177
178 /*
Mark Fasheh16d5b952006-09-13 21:10:12 -0700179 * Allow a lock type to add checks to determine whether it is
180 * safe to downconvert a lock. Return 0 to re-queue the
181 * downconvert at a later time, nonzero to continue.
182 *
183 * For most locks, the default checks that there are no
184 * incompatible holders are sufficient.
185 *
186 * Called with the lockres spinlock held.
187 */
188 int (*check_downconvert)(struct ocfs2_lock_res *, int);
189
190 /*
Mark Fasheh5ef0d4e2006-09-13 21:21:52 -0700191 * Allows a lock type to populate the lock value block. This
192 * is called on downconvert, and when we drop a lock.
193 *
194 * Locks that want to use this should set LOCK_TYPE_USES_LVB
195 * in the flags field.
196 *
197 * Called with the lockres spinlock held.
198 */
199 void (*set_lvb)(struct ocfs2_lock_res *);
200
201 /*
Mark Fashehcc567d82006-09-13 21:52:21 -0700202 * Called from the downconvert thread when it is determined
203 * that a lock will be downconverted. This is called without
204 * any locks held so the function can do work that might
205 * schedule (syncing out data, etc).
206 *
207 * This should return any one of the ocfs2_unblock_action
208 * values, depending on what it wants the thread to do.
209 */
210 int (*downconvert_worker)(struct ocfs2_lock_res *, int);
211
212 /*
Mark Fashehf625c972006-09-12 21:24:53 -0700213 * LOCK_TYPE_* flags which describe the specific requirements
214 * of a lock type. Descriptions of each individual flag follow.
215 */
216 int flags;
Mark Fashehccd979b2005-12-15 14:31:24 -0800217};
218
Mark Fashehf625c972006-09-12 21:24:53 -0700219/*
220 * Some locks want to "refresh" potentially stale data when a
221 * meaningful (PRMODE or EXMODE) lock level is first obtained. If this
222 * flag is set, the OCFS2_LOCK_NEEDS_REFRESH flag will be set on the
223 * individual lockres l_flags member from the ast function. It is
224 * expected that the locking wrapper will clear the
225 * OCFS2_LOCK_NEEDS_REFRESH flag when done.
226 */
227#define LOCK_TYPE_REQUIRES_REFRESH 0x1
228
Mark Fashehb80fc012006-09-12 22:08:14 -0700229/*
Mark Fasheh5ef0d4e2006-09-13 21:21:52 -0700230 * Indicate that a lock type makes use of the lock value block. The
231 * ->set_lvb lock type callback must be defined.
Mark Fashehb80fc012006-09-12 22:08:14 -0700232 */
233#define LOCK_TYPE_USES_LVB 0x2
234
Mark Fashehccd979b2005-12-15 14:31:24 -0800235static struct ocfs2_lock_res_ops ocfs2_inode_rw_lops = {
Mark Fasheh54a7e752006-09-12 21:49:13 -0700236 .get_osb = ocfs2_get_inode_osb,
Mark Fashehf625c972006-09-12 21:24:53 -0700237 .flags = 0,
Mark Fashehccd979b2005-12-15 14:31:24 -0800238};
239
Mark Fashehe63aecb62007-10-18 15:30:42 -0700240static struct ocfs2_lock_res_ops ocfs2_inode_inode_lops = {
Mark Fasheh54a7e752006-09-12 21:49:13 -0700241 .get_osb = ocfs2_get_inode_osb,
Mark Fasheh810d5ae2006-09-13 21:39:52 -0700242 .check_downconvert = ocfs2_check_meta_downconvert,
243 .set_lvb = ocfs2_set_meta_lvb,
Mark Fashehf1f54062007-10-18 15:13:59 -0700244 .downconvert_worker = ocfs2_data_convert_worker,
Mark Fashehb80fc012006-09-12 22:08:14 -0700245 .flags = LOCK_TYPE_REQUIRES_REFRESH|LOCK_TYPE_USES_LVB,
Mark Fashehccd979b2005-12-15 14:31:24 -0800246};
247
Mark Fashehccd979b2005-12-15 14:31:24 -0800248static struct ocfs2_lock_res_ops ocfs2_super_lops = {
Mark Fashehf625c972006-09-12 21:24:53 -0700249 .flags = LOCK_TYPE_REQUIRES_REFRESH,
Mark Fashehccd979b2005-12-15 14:31:24 -0800250};
251
252static struct ocfs2_lock_res_ops ocfs2_rename_lops = {
Mark Fashehf625c972006-09-12 21:24:53 -0700253 .flags = 0,
Mark Fashehccd979b2005-12-15 14:31:24 -0800254};
255
wengang wang6ca497a2009-03-06 21:29:10 +0800256static struct ocfs2_lock_res_ops ocfs2_nfs_sync_lops = {
257 .flags = 0,
258};
259
Srinivas Eeda83273932009-06-03 17:02:55 -0700260static struct ocfs2_lock_res_ops ocfs2_orphan_scan_lops = {
261 .flags = LOCK_TYPE_REQUIRES_REFRESH|LOCK_TYPE_USES_LVB,
262};
263
Mark Fashehd680efe2006-09-08 14:14:34 -0700264static struct ocfs2_lock_res_ops ocfs2_dentry_lops = {
Mark Fasheh54a7e752006-09-12 21:49:13 -0700265 .get_osb = ocfs2_get_dentry_osb,
Mark Fashehd680efe2006-09-08 14:14:34 -0700266 .post_unlock = ocfs2_dentry_post_unlock,
Mark Fashehcc567d82006-09-13 21:52:21 -0700267 .downconvert_worker = ocfs2_dentry_convert_worker,
Mark Fashehf625c972006-09-12 21:24:53 -0700268 .flags = 0,
Mark Fashehd680efe2006-09-08 14:14:34 -0700269};
270
Tiger Yang50008632007-03-20 16:01:38 -0700271static struct ocfs2_lock_res_ops ocfs2_inode_open_lops = {
272 .get_osb = ocfs2_get_inode_osb,
273 .flags = 0,
274};
275
Mark Fashehcf8e06f2007-12-20 16:43:10 -0800276static struct ocfs2_lock_res_ops ocfs2_flock_lops = {
277 .get_osb = ocfs2_get_file_osb,
278 .flags = 0,
279};
280
Jan Kara9e33d692008-08-25 19:56:50 +0200281static struct ocfs2_lock_res_ops ocfs2_qinfo_lops = {
282 .set_lvb = ocfs2_set_qinfo_lvb,
283 .get_osb = ocfs2_get_qinfo_osb,
284 .flags = LOCK_TYPE_REQUIRES_REFRESH | LOCK_TYPE_USES_LVB,
285};
286
Tao Ma8dec98e2009-08-18 11:19:58 +0800287static struct ocfs2_lock_res_ops ocfs2_refcount_block_lops = {
288 .check_downconvert = ocfs2_check_refcount_downconvert,
289 .downconvert_worker = ocfs2_refcount_convert_worker,
290 .flags = 0,
291};
292
Mark Fashehccd979b2005-12-15 14:31:24 -0800293static inline int ocfs2_is_inode_lock(struct ocfs2_lock_res *lockres)
294{
295 return lockres->l_type == OCFS2_LOCK_TYPE_META ||
Tiger Yang50008632007-03-20 16:01:38 -0700296 lockres->l_type == OCFS2_LOCK_TYPE_RW ||
297 lockres->l_type == OCFS2_LOCK_TYPE_OPEN;
Mark Fashehccd979b2005-12-15 14:31:24 -0800298}
299
Joel Beckerc0e41332010-01-29 14:46:44 -0800300static inline struct ocfs2_lock_res *ocfs2_lksb_to_lock_res(struct ocfs2_dlm_lksb *lksb)
Joel Beckera796d282010-01-28 19:22:39 -0800301{
302 return container_of(lksb, struct ocfs2_lock_res, l_lksb);
303}
304
Mark Fashehccd979b2005-12-15 14:31:24 -0800305static inline struct inode *ocfs2_lock_res_inode(struct ocfs2_lock_res *lockres)
306{
307 BUG_ON(!ocfs2_is_inode_lock(lockres));
308
309 return (struct inode *) lockres->l_priv;
310}
311
Mark Fashehd680efe2006-09-08 14:14:34 -0700312static inline struct ocfs2_dentry_lock *ocfs2_lock_res_dl(struct ocfs2_lock_res *lockres)
313{
314 BUG_ON(lockres->l_type != OCFS2_LOCK_TYPE_DENTRY);
315
316 return (struct ocfs2_dentry_lock *)lockres->l_priv;
317}
318
Jan Kara9e33d692008-08-25 19:56:50 +0200319static inline struct ocfs2_mem_dqinfo *ocfs2_lock_res_qinfo(struct ocfs2_lock_res *lockres)
320{
321 BUG_ON(lockres->l_type != OCFS2_LOCK_TYPE_QINFO);
322
323 return (struct ocfs2_mem_dqinfo *)lockres->l_priv;
324}
325
Tao Ma8dec98e2009-08-18 11:19:58 +0800326static inline struct ocfs2_refcount_tree *
327ocfs2_lock_res_refcount_tree(struct ocfs2_lock_res *res)
328{
329 return container_of(res, struct ocfs2_refcount_tree, rf_lockres);
330}
331
Mark Fasheh54a7e752006-09-12 21:49:13 -0700332static inline struct ocfs2_super *ocfs2_get_lockres_osb(struct ocfs2_lock_res *lockres)
333{
334 if (lockres->l_ops->get_osb)
335 return lockres->l_ops->get_osb(lockres);
336
337 return (struct ocfs2_super *)lockres->l_priv;
338}
339
Mark Fashehccd979b2005-12-15 14:31:24 -0800340static int ocfs2_lock_create(struct ocfs2_super *osb,
341 struct ocfs2_lock_res *lockres,
342 int level,
Joel Beckerbd3e7612008-02-01 12:14:57 -0800343 u32 dlm_flags);
Mark Fashehccd979b2005-12-15 14:31:24 -0800344static inline int ocfs2_may_continue_on_blocked_lock(struct ocfs2_lock_res *lockres,
345 int wanted);
Jan Karacb257972009-06-04 15:26:50 +0200346static void __ocfs2_cluster_unlock(struct ocfs2_super *osb,
347 struct ocfs2_lock_res *lockres,
348 int level, unsigned long caller_ip);
349static inline void ocfs2_cluster_unlock(struct ocfs2_super *osb,
350 struct ocfs2_lock_res *lockres,
351 int level)
352{
353 __ocfs2_cluster_unlock(osb, lockres, level, _RET_IP_);
354}
355
Mark Fashehccd979b2005-12-15 14:31:24 -0800356static inline void ocfs2_generic_handle_downconvert_action(struct ocfs2_lock_res *lockres);
357static inline void ocfs2_generic_handle_convert_action(struct ocfs2_lock_res *lockres);
358static inline void ocfs2_generic_handle_attach_action(struct ocfs2_lock_res *lockres);
359static int ocfs2_generic_handle_bast(struct ocfs2_lock_res *lockres, int level);
360static void ocfs2_schedule_blocked_lock(struct ocfs2_super *osb,
361 struct ocfs2_lock_res *lockres);
362static inline void ocfs2_recover_from_dlm_error(struct ocfs2_lock_res *lockres,
363 int convert);
Sunil Mushranc74ff8b2009-02-03 12:37:14 -0800364#define ocfs2_log_dlm_error(_func, _err, _lockres) do { \
365 if ((_lockres)->l_type != OCFS2_LOCK_TYPE_DENTRY) \
366 mlog(ML_ERROR, "DLM error %d while calling %s on resource %s\n", \
367 _err, _func, _lockres->l_name); \
368 else \
369 mlog(ML_ERROR, "DLM error %d while calling %s on resource %.*s%08x\n", \
370 _err, _func, OCFS2_DENTRY_LOCK_INO_START - 1, (_lockres)->l_name, \
371 (unsigned int)ocfs2_get_dentry_lock_ino(_lockres)); \
Mark Fashehccd979b2005-12-15 14:31:24 -0800372} while (0)
Mark Fasheh34d024f2007-09-24 15:56:19 -0700373static int ocfs2_downconvert_thread(void *arg);
374static void ocfs2_downconvert_on_unlock(struct ocfs2_super *osb,
375 struct ocfs2_lock_res *lockres);
Mark Fashehe63aecb62007-10-18 15:30:42 -0700376static int ocfs2_inode_lock_update(struct inode *inode,
Mark Fashehccd979b2005-12-15 14:31:24 -0800377 struct buffer_head **bh);
378static void ocfs2_drop_osb_locks(struct ocfs2_super *osb);
379static inline int ocfs2_highest_compat_lock_level(int level);
Joel Beckerde551242008-02-01 14:45:08 -0800380static unsigned int ocfs2_prepare_downconvert(struct ocfs2_lock_res *lockres,
381 int new_level);
Mark Fashehcf8e06f2007-12-20 16:43:10 -0800382static int ocfs2_downconvert_lock(struct ocfs2_super *osb,
383 struct ocfs2_lock_res *lockres,
384 int new_level,
Joel Beckerde551242008-02-01 14:45:08 -0800385 int lvb,
386 unsigned int generation);
Mark Fashehcf8e06f2007-12-20 16:43:10 -0800387static int ocfs2_prepare_cancel_convert(struct ocfs2_super *osb,
388 struct ocfs2_lock_res *lockres);
389static int ocfs2_cancel_convert(struct ocfs2_super *osb,
390 struct ocfs2_lock_res *lockres);
391
Mark Fashehccd979b2005-12-15 14:31:24 -0800392
Mark Fashehccd979b2005-12-15 14:31:24 -0800393static void ocfs2_build_lock_name(enum ocfs2_lock_type type,
394 u64 blkno,
395 u32 generation,
396 char *name)
397{
398 int len;
399
Mark Fashehccd979b2005-12-15 14:31:24 -0800400 BUG_ON(type >= OCFS2_NUM_LOCK_TYPES);
401
Mark Fashehb06970532006-03-03 10:24:33 -0800402 len = snprintf(name, OCFS2_LOCK_ID_MAX_LEN, "%c%s%016llx%08x",
403 ocfs2_lock_type_char(type), OCFS2_LOCK_ID_PAD,
404 (long long)blkno, generation);
Mark Fashehccd979b2005-12-15 14:31:24 -0800405
406 BUG_ON(len != (OCFS2_LOCK_ID_MAX_LEN - 1));
407
408 mlog(0, "built lock resource with name: %s\n", name);
Mark Fashehccd979b2005-12-15 14:31:24 -0800409}
410
Ingo Molnar34af9462006-06-27 02:53:55 -0700411static DEFINE_SPINLOCK(ocfs2_dlm_tracking_lock);
Mark Fashehccd979b2005-12-15 14:31:24 -0800412
413static void ocfs2_add_lockres_tracking(struct ocfs2_lock_res *res,
414 struct ocfs2_dlm_debug *dlm_debug)
415{
416 mlog(0, "Add tracking for lockres %s\n", res->l_name);
417
418 spin_lock(&ocfs2_dlm_tracking_lock);
419 list_add(&res->l_debug_list, &dlm_debug->d_lockres_tracking);
420 spin_unlock(&ocfs2_dlm_tracking_lock);
421}
422
423static void ocfs2_remove_lockres_tracking(struct ocfs2_lock_res *res)
424{
425 spin_lock(&ocfs2_dlm_tracking_lock);
426 if (!list_empty(&res->l_debug_list))
427 list_del_init(&res->l_debug_list);
428 spin_unlock(&ocfs2_dlm_tracking_lock);
429}
430
Sunil Mushran8ddb7b02008-05-13 13:45:15 -0700431#ifdef CONFIG_OCFS2_FS_STATS
432static void ocfs2_init_lock_stats(struct ocfs2_lock_res *res)
433{
Sunil Mushran8ddb7b02008-05-13 13:45:15 -0700434 res->l_lock_refresh = 0;
Sunil Mushran5bc970e2010-12-28 23:26:03 -0800435 memset(&res->l_lock_prmode, 0, sizeof(struct ocfs2_lock_stats));
436 memset(&res->l_lock_exmode, 0, sizeof(struct ocfs2_lock_stats));
Sunil Mushran8ddb7b02008-05-13 13:45:15 -0700437}
438
439static void ocfs2_update_lock_stats(struct ocfs2_lock_res *res, int level,
440 struct ocfs2_mask_waiter *mw, int ret)
441{
Sunil Mushran5bc970e2010-12-28 23:26:03 -0800442 u32 usec;
443 ktime_t kt;
444 struct ocfs2_lock_stats *stats;
Sunil Mushran8ddb7b02008-05-13 13:45:15 -0700445
Sunil Mushran5bc970e2010-12-28 23:26:03 -0800446 if (level == LKM_PRMODE)
447 stats = &res->l_lock_prmode;
448 else if (level == LKM_EXMODE)
449 stats = &res->l_lock_exmode;
450 else
Sunil Mushran8ddb7b02008-05-13 13:45:15 -0700451 return;
452
Sunil Mushran5bc970e2010-12-28 23:26:03 -0800453 kt = ktime_sub(ktime_get(), mw->mw_lock_start);
454 usec = ktime_to_us(kt);
455
456 stats->ls_gets++;
457 stats->ls_total += ktime_to_ns(kt);
458 /* overflow */
roel16865b72011-12-12 23:40:51 +0100459 if (unlikely(stats->ls_gets == 0)) {
Sunil Mushran5bc970e2010-12-28 23:26:03 -0800460 stats->ls_gets++;
461 stats->ls_total = ktime_to_ns(kt);
462 }
463
464 if (stats->ls_max < usec)
465 stats->ls_max = usec;
466
Sunil Mushran8ddb7b02008-05-13 13:45:15 -0700467 if (ret)
Sunil Mushran5bc970e2010-12-28 23:26:03 -0800468 stats->ls_fail++;
Sunil Mushran8ddb7b02008-05-13 13:45:15 -0700469}
470
471static inline void ocfs2_track_lock_refresh(struct ocfs2_lock_res *lockres)
472{
473 lockres->l_lock_refresh++;
474}
475
476static inline void ocfs2_init_start_time(struct ocfs2_mask_waiter *mw)
477{
Sunil Mushran5bc970e2010-12-28 23:26:03 -0800478 mw->mw_lock_start = ktime_get();
Sunil Mushran8ddb7b02008-05-13 13:45:15 -0700479}
480#else
481static inline void ocfs2_init_lock_stats(struct ocfs2_lock_res *res)
482{
483}
484static inline void ocfs2_update_lock_stats(struct ocfs2_lock_res *res,
485 int level, struct ocfs2_mask_waiter *mw, int ret)
486{
487}
488static inline void ocfs2_track_lock_refresh(struct ocfs2_lock_res *lockres)
489{
490}
491static inline void ocfs2_init_start_time(struct ocfs2_mask_waiter *mw)
492{
493}
494#endif
495
Mark Fashehccd979b2005-12-15 14:31:24 -0800496static void ocfs2_lock_res_init_common(struct ocfs2_super *osb,
497 struct ocfs2_lock_res *res,
498 enum ocfs2_lock_type type,
Mark Fashehccd979b2005-12-15 14:31:24 -0800499 struct ocfs2_lock_res_ops *ops,
500 void *priv)
501{
Mark Fashehccd979b2005-12-15 14:31:24 -0800502 res->l_type = type;
503 res->l_ops = ops;
504 res->l_priv = priv;
505
Joel Beckerbd3e7612008-02-01 12:14:57 -0800506 res->l_level = DLM_LOCK_IV;
507 res->l_requested = DLM_LOCK_IV;
508 res->l_blocking = DLM_LOCK_IV;
Mark Fashehccd979b2005-12-15 14:31:24 -0800509 res->l_action = OCFS2_AST_INVALID;
510 res->l_unlock_action = OCFS2_UNLOCK_INVALID;
511
512 res->l_flags = OCFS2_LOCK_INITIALIZED;
513
514 ocfs2_add_lockres_tracking(res, osb->osb_dlm_debug);
Sunil Mushran8ddb7b02008-05-13 13:45:15 -0700515
516 ocfs2_init_lock_stats(res);
Jan Karacb257972009-06-04 15:26:50 +0200517#ifdef CONFIG_DEBUG_LOCK_ALLOC
518 if (type != OCFS2_LOCK_TYPE_OPEN)
519 lockdep_init_map(&res->l_lockdep_map, ocfs2_lock_type_strings[type],
520 &lockdep_keys[type], 0);
521 else
522 res->l_lockdep_map.key = NULL;
523#endif
Mark Fashehccd979b2005-12-15 14:31:24 -0800524}
525
526void ocfs2_lock_res_init_once(struct ocfs2_lock_res *res)
527{
528 /* This also clears out the lock status block */
529 memset(res, 0, sizeof(struct ocfs2_lock_res));
530 spin_lock_init(&res->l_lock);
531 init_waitqueue_head(&res->l_event);
532 INIT_LIST_HEAD(&res->l_blocked_list);
533 INIT_LIST_HEAD(&res->l_mask_waiters);
534}
535
536void ocfs2_inode_lock_res_init(struct ocfs2_lock_res *res,
537 enum ocfs2_lock_type type,
Mark Fasheh24c19ef2006-09-22 17:28:19 -0700538 unsigned int generation,
Mark Fashehccd979b2005-12-15 14:31:24 -0800539 struct inode *inode)
540{
541 struct ocfs2_lock_res_ops *ops;
542
543 switch(type) {
544 case OCFS2_LOCK_TYPE_RW:
545 ops = &ocfs2_inode_rw_lops;
546 break;
547 case OCFS2_LOCK_TYPE_META:
Mark Fashehe63aecb62007-10-18 15:30:42 -0700548 ops = &ocfs2_inode_inode_lops;
Mark Fashehccd979b2005-12-15 14:31:24 -0800549 break;
Tiger Yang50008632007-03-20 16:01:38 -0700550 case OCFS2_LOCK_TYPE_OPEN:
551 ops = &ocfs2_inode_open_lops;
552 break;
Mark Fashehccd979b2005-12-15 14:31:24 -0800553 default:
554 mlog_bug_on_msg(1, "type: %d\n", type);
555 ops = NULL; /* thanks, gcc */
556 break;
557 };
558
Mark Fashehd680efe2006-09-08 14:14:34 -0700559 ocfs2_build_lock_name(type, OCFS2_I(inode)->ip_blkno,
Mark Fasheh24c19ef2006-09-22 17:28:19 -0700560 generation, res->l_name);
Mark Fashehd680efe2006-09-08 14:14:34 -0700561 ocfs2_lock_res_init_common(OCFS2_SB(inode->i_sb), res, type, ops, inode);
562}
563
Mark Fasheh54a7e752006-09-12 21:49:13 -0700564static struct ocfs2_super *ocfs2_get_inode_osb(struct ocfs2_lock_res *lockres)
565{
566 struct inode *inode = ocfs2_lock_res_inode(lockres);
567
568 return OCFS2_SB(inode->i_sb);
569}
570
Jan Kara9e33d692008-08-25 19:56:50 +0200571static struct ocfs2_super *ocfs2_get_qinfo_osb(struct ocfs2_lock_res *lockres)
572{
573 struct ocfs2_mem_dqinfo *info = lockres->l_priv;
574
575 return OCFS2_SB(info->dqi_gi.dqi_sb);
576}
577
Mark Fashehcf8e06f2007-12-20 16:43:10 -0800578static struct ocfs2_super *ocfs2_get_file_osb(struct ocfs2_lock_res *lockres)
579{
580 struct ocfs2_file_private *fp = lockres->l_priv;
581
582 return OCFS2_SB(fp->fp_file->f_mapping->host->i_sb);
583}
584
Mark Fashehd680efe2006-09-08 14:14:34 -0700585static __u64 ocfs2_get_dentry_lock_ino(struct ocfs2_lock_res *lockres)
586{
587 __be64 inode_blkno_be;
588
589 memcpy(&inode_blkno_be, &lockres->l_name[OCFS2_DENTRY_LOCK_INO_START],
590 sizeof(__be64));
591
592 return be64_to_cpu(inode_blkno_be);
593}
594
Mark Fasheh54a7e752006-09-12 21:49:13 -0700595static struct ocfs2_super *ocfs2_get_dentry_osb(struct ocfs2_lock_res *lockres)
596{
597 struct ocfs2_dentry_lock *dl = lockres->l_priv;
598
599 return OCFS2_SB(dl->dl_inode->i_sb);
600}
601
Mark Fashehd680efe2006-09-08 14:14:34 -0700602void ocfs2_dentry_lock_res_init(struct ocfs2_dentry_lock *dl,
603 u64 parent, struct inode *inode)
604{
605 int len;
606 u64 inode_blkno = OCFS2_I(inode)->ip_blkno;
607 __be64 inode_blkno_be = cpu_to_be64(inode_blkno);
608 struct ocfs2_lock_res *lockres = &dl->dl_lockres;
609
610 ocfs2_lock_res_init_once(lockres);
611
612 /*
613 * Unfortunately, the standard lock naming scheme won't work
614 * here because we have two 16 byte values to use. Instead,
615 * we'll stuff the inode number as a binary value. We still
616 * want error prints to show something without garbling the
617 * display, so drop a null byte in there before the inode
618 * number. A future version of OCFS2 will likely use all
619 * binary lock names. The stringified names have been a
620 * tremendous aid in debugging, but now that the debugfs
621 * interface exists, we can mangle things there if need be.
622 *
623 * NOTE: We also drop the standard "pad" value (the total lock
624 * name size stays the same though - the last part is all
625 * zeros due to the memset in ocfs2_lock_res_init_once()
626 */
627 len = snprintf(lockres->l_name, OCFS2_DENTRY_LOCK_INO_START,
628 "%c%016llx",
629 ocfs2_lock_type_char(OCFS2_LOCK_TYPE_DENTRY),
630 (long long)parent);
631
632 BUG_ON(len != (OCFS2_DENTRY_LOCK_INO_START - 1));
633
634 memcpy(&lockres->l_name[OCFS2_DENTRY_LOCK_INO_START], &inode_blkno_be,
635 sizeof(__be64));
636
637 ocfs2_lock_res_init_common(OCFS2_SB(inode->i_sb), lockres,
638 OCFS2_LOCK_TYPE_DENTRY, &ocfs2_dentry_lops,
639 dl);
Mark Fashehccd979b2005-12-15 14:31:24 -0800640}
641
642static void ocfs2_super_lock_res_init(struct ocfs2_lock_res *res,
643 struct ocfs2_super *osb)
644{
645 /* Superblock lockres doesn't come from a slab so we call init
646 * once on it manually. */
647 ocfs2_lock_res_init_once(res);
Mark Fashehd680efe2006-09-08 14:14:34 -0700648 ocfs2_build_lock_name(OCFS2_LOCK_TYPE_SUPER, OCFS2_SUPER_BLOCK_BLKNO,
649 0, res->l_name);
Mark Fashehccd979b2005-12-15 14:31:24 -0800650 ocfs2_lock_res_init_common(osb, res, OCFS2_LOCK_TYPE_SUPER,
Mark Fashehccd979b2005-12-15 14:31:24 -0800651 &ocfs2_super_lops, osb);
652}
653
654static void ocfs2_rename_lock_res_init(struct ocfs2_lock_res *res,
655 struct ocfs2_super *osb)
656{
657 /* Rename lockres doesn't come from a slab so we call init
658 * once on it manually. */
659 ocfs2_lock_res_init_once(res);
Mark Fashehd680efe2006-09-08 14:14:34 -0700660 ocfs2_build_lock_name(OCFS2_LOCK_TYPE_RENAME, 0, 0, res->l_name);
661 ocfs2_lock_res_init_common(osb, res, OCFS2_LOCK_TYPE_RENAME,
Mark Fashehccd979b2005-12-15 14:31:24 -0800662 &ocfs2_rename_lops, osb);
663}
664
wengang wang6ca497a2009-03-06 21:29:10 +0800665static void ocfs2_nfs_sync_lock_res_init(struct ocfs2_lock_res *res,
666 struct ocfs2_super *osb)
667{
668 /* nfs_sync lockres doesn't come from a slab so we call init
669 * once on it manually. */
670 ocfs2_lock_res_init_once(res);
671 ocfs2_build_lock_name(OCFS2_LOCK_TYPE_NFS_SYNC, 0, 0, res->l_name);
672 ocfs2_lock_res_init_common(osb, res, OCFS2_LOCK_TYPE_NFS_SYNC,
673 &ocfs2_nfs_sync_lops, osb);
674}
675
Srinivas Eeda83273932009-06-03 17:02:55 -0700676static void ocfs2_orphan_scan_lock_res_init(struct ocfs2_lock_res *res,
677 struct ocfs2_super *osb)
678{
Srinivas Eeda83273932009-06-03 17:02:55 -0700679 ocfs2_lock_res_init_once(res);
680 ocfs2_build_lock_name(OCFS2_LOCK_TYPE_ORPHAN_SCAN, 0, 0, res->l_name);
681 ocfs2_lock_res_init_common(osb, res, OCFS2_LOCK_TYPE_ORPHAN_SCAN,
682 &ocfs2_orphan_scan_lops, osb);
Srinivas Eeda83273932009-06-03 17:02:55 -0700683}
684
Mark Fashehcf8e06f2007-12-20 16:43:10 -0800685void ocfs2_file_lock_res_init(struct ocfs2_lock_res *lockres,
686 struct ocfs2_file_private *fp)
687{
688 struct inode *inode = fp->fp_file->f_mapping->host;
689 struct ocfs2_inode_info *oi = OCFS2_I(inode);
690
691 ocfs2_lock_res_init_once(lockres);
692 ocfs2_build_lock_name(OCFS2_LOCK_TYPE_FLOCK, oi->ip_blkno,
693 inode->i_generation, lockres->l_name);
694 ocfs2_lock_res_init_common(OCFS2_SB(inode->i_sb), lockres,
695 OCFS2_LOCK_TYPE_FLOCK, &ocfs2_flock_lops,
696 fp);
697 lockres->l_flags |= OCFS2_LOCK_NOCACHE;
698}
699
Jan Kara9e33d692008-08-25 19:56:50 +0200700void ocfs2_qinfo_lock_res_init(struct ocfs2_lock_res *lockres,
701 struct ocfs2_mem_dqinfo *info)
702{
703 ocfs2_lock_res_init_once(lockres);
704 ocfs2_build_lock_name(OCFS2_LOCK_TYPE_QINFO, info->dqi_gi.dqi_type,
705 0, lockres->l_name);
706 ocfs2_lock_res_init_common(OCFS2_SB(info->dqi_gi.dqi_sb), lockres,
707 OCFS2_LOCK_TYPE_QINFO, &ocfs2_qinfo_lops,
708 info);
709}
710
Tao Ma8dec98e2009-08-18 11:19:58 +0800711void ocfs2_refcount_lock_res_init(struct ocfs2_lock_res *lockres,
712 struct ocfs2_super *osb, u64 ref_blkno,
713 unsigned int generation)
714{
715 ocfs2_lock_res_init_once(lockres);
716 ocfs2_build_lock_name(OCFS2_LOCK_TYPE_REFCOUNT, ref_blkno,
717 generation, lockres->l_name);
718 ocfs2_lock_res_init_common(osb, lockres, OCFS2_LOCK_TYPE_REFCOUNT,
719 &ocfs2_refcount_block_lops, osb);
720}
721
Mark Fashehccd979b2005-12-15 14:31:24 -0800722void ocfs2_lock_res_free(struct ocfs2_lock_res *res)
723{
Mark Fashehccd979b2005-12-15 14:31:24 -0800724 if (!(res->l_flags & OCFS2_LOCK_INITIALIZED))
725 return;
726
727 ocfs2_remove_lockres_tracking(res);
728
729 mlog_bug_on_msg(!list_empty(&res->l_blocked_list),
730 "Lockres %s is on the blocked list\n",
731 res->l_name);
732 mlog_bug_on_msg(!list_empty(&res->l_mask_waiters),
733 "Lockres %s has mask waiters pending\n",
734 res->l_name);
735 mlog_bug_on_msg(spin_is_locked(&res->l_lock),
736 "Lockres %s is locked\n",
737 res->l_name);
738 mlog_bug_on_msg(res->l_ro_holders,
739 "Lockres %s has %u ro holders\n",
740 res->l_name, res->l_ro_holders);
741 mlog_bug_on_msg(res->l_ex_holders,
742 "Lockres %s has %u ex holders\n",
743 res->l_name, res->l_ex_holders);
744
745 /* Need to clear out the lock status block for the dlm */
746 memset(&res->l_lksb, 0, sizeof(res->l_lksb));
747
748 res->l_flags = 0UL;
Mark Fashehccd979b2005-12-15 14:31:24 -0800749}
750
751static inline void ocfs2_inc_holders(struct ocfs2_lock_res *lockres,
752 int level)
753{
Mark Fashehccd979b2005-12-15 14:31:24 -0800754 BUG_ON(!lockres);
755
756 switch(level) {
Joel Beckerbd3e7612008-02-01 12:14:57 -0800757 case DLM_LOCK_EX:
Mark Fashehccd979b2005-12-15 14:31:24 -0800758 lockres->l_ex_holders++;
759 break;
Joel Beckerbd3e7612008-02-01 12:14:57 -0800760 case DLM_LOCK_PR:
Mark Fashehccd979b2005-12-15 14:31:24 -0800761 lockres->l_ro_holders++;
762 break;
763 default:
764 BUG();
765 }
Mark Fashehccd979b2005-12-15 14:31:24 -0800766}
767
768static inline void ocfs2_dec_holders(struct ocfs2_lock_res *lockres,
769 int level)
770{
Mark Fashehccd979b2005-12-15 14:31:24 -0800771 BUG_ON(!lockres);
772
773 switch(level) {
Joel Beckerbd3e7612008-02-01 12:14:57 -0800774 case DLM_LOCK_EX:
Mark Fashehccd979b2005-12-15 14:31:24 -0800775 BUG_ON(!lockres->l_ex_holders);
776 lockres->l_ex_holders--;
777 break;
Joel Beckerbd3e7612008-02-01 12:14:57 -0800778 case DLM_LOCK_PR:
Mark Fashehccd979b2005-12-15 14:31:24 -0800779 BUG_ON(!lockres->l_ro_holders);
780 lockres->l_ro_holders--;
781 break;
782 default:
783 BUG();
784 }
Mark Fashehccd979b2005-12-15 14:31:24 -0800785}
786
787/* WARNING: This function lives in a world where the only three lock
788 * levels are EX, PR, and NL. It *will* have to be adjusted when more
789 * lock types are added. */
790static inline int ocfs2_highest_compat_lock_level(int level)
791{
Joel Beckerbd3e7612008-02-01 12:14:57 -0800792 int new_level = DLM_LOCK_EX;
Mark Fashehccd979b2005-12-15 14:31:24 -0800793
Joel Beckerbd3e7612008-02-01 12:14:57 -0800794 if (level == DLM_LOCK_EX)
795 new_level = DLM_LOCK_NL;
796 else if (level == DLM_LOCK_PR)
797 new_level = DLM_LOCK_PR;
Mark Fashehccd979b2005-12-15 14:31:24 -0800798 return new_level;
799}
800
801static void lockres_set_flags(struct ocfs2_lock_res *lockres,
802 unsigned long newflags)
803{
Christoph Hellwig800deef2007-05-17 16:03:13 +0200804 struct ocfs2_mask_waiter *mw, *tmp;
Mark Fashehccd979b2005-12-15 14:31:24 -0800805
806 assert_spin_locked(&lockres->l_lock);
807
808 lockres->l_flags = newflags;
809
Christoph Hellwig800deef2007-05-17 16:03:13 +0200810 list_for_each_entry_safe(mw, tmp, &lockres->l_mask_waiters, mw_item) {
Mark Fashehccd979b2005-12-15 14:31:24 -0800811 if ((lockres->l_flags & mw->mw_mask) != mw->mw_goal)
812 continue;
813
814 list_del_init(&mw->mw_item);
815 mw->mw_status = 0;
816 complete(&mw->mw_complete);
817 }
818}
819static void lockres_or_flags(struct ocfs2_lock_res *lockres, unsigned long or)
820{
821 lockres_set_flags(lockres, lockres->l_flags | or);
822}
823static void lockres_clear_flags(struct ocfs2_lock_res *lockres,
824 unsigned long clear)
825{
826 lockres_set_flags(lockres, lockres->l_flags & ~clear);
827}
828
829static inline void ocfs2_generic_handle_downconvert_action(struct ocfs2_lock_res *lockres)
830{
Mark Fashehccd979b2005-12-15 14:31:24 -0800831 BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BUSY));
832 BUG_ON(!(lockres->l_flags & OCFS2_LOCK_ATTACHED));
833 BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BLOCKED));
Joel Beckerbd3e7612008-02-01 12:14:57 -0800834 BUG_ON(lockres->l_blocking <= DLM_LOCK_NL);
Mark Fashehccd979b2005-12-15 14:31:24 -0800835
836 lockres->l_level = lockres->l_requested;
837 if (lockres->l_level <=
838 ocfs2_highest_compat_lock_level(lockres->l_blocking)) {
Joel Beckerbd3e7612008-02-01 12:14:57 -0800839 lockres->l_blocking = DLM_LOCK_NL;
Mark Fashehccd979b2005-12-15 14:31:24 -0800840 lockres_clear_flags(lockres, OCFS2_LOCK_BLOCKED);
841 }
842 lockres_clear_flags(lockres, OCFS2_LOCK_BUSY);
Mark Fashehccd979b2005-12-15 14:31:24 -0800843}
844
845static inline void ocfs2_generic_handle_convert_action(struct ocfs2_lock_res *lockres)
846{
Mark Fashehccd979b2005-12-15 14:31:24 -0800847 BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BUSY));
848 BUG_ON(!(lockres->l_flags & OCFS2_LOCK_ATTACHED));
849
850 /* Convert from RO to EX doesn't really need anything as our
851 * information is already up to data. Convert from NL to
852 * *anything* however should mark ourselves as needing an
853 * update */
Joel Beckerbd3e7612008-02-01 12:14:57 -0800854 if (lockres->l_level == DLM_LOCK_NL &&
Mark Fashehf625c972006-09-12 21:24:53 -0700855 lockres->l_ops->flags & LOCK_TYPE_REQUIRES_REFRESH)
Mark Fashehccd979b2005-12-15 14:31:24 -0800856 lockres_or_flags(lockres, OCFS2_LOCK_NEEDS_REFRESH);
857
858 lockres->l_level = lockres->l_requested;
Sunil Mushrana1912822010-01-21 10:50:03 -0800859
860 /*
861 * We set the OCFS2_LOCK_UPCONVERT_FINISHING flag before clearing
862 * the OCFS2_LOCK_BUSY flag to prevent the dc thread from
863 * downconverting the lock before the upconvert has fully completed.
Xue jiufeid1e782382014-12-10 15:41:59 -0800864 * Do not prevent the dc thread from downconverting if NONBLOCK lock
865 * had already returned.
Sunil Mushrana1912822010-01-21 10:50:03 -0800866 */
Xue jiufeid1e782382014-12-10 15:41:59 -0800867 if (!(lockres->l_flags & OCFS2_LOCK_NONBLOCK_FINISHED))
868 lockres_or_flags(lockres, OCFS2_LOCK_UPCONVERT_FINISHING);
869 else
870 lockres_clear_flags(lockres, OCFS2_LOCK_NONBLOCK_FINISHED);
Sunil Mushrana1912822010-01-21 10:50:03 -0800871
Mark Fashehccd979b2005-12-15 14:31:24 -0800872 lockres_clear_flags(lockres, OCFS2_LOCK_BUSY);
Mark Fashehccd979b2005-12-15 14:31:24 -0800873}
874
875static inline void ocfs2_generic_handle_attach_action(struct ocfs2_lock_res *lockres)
876{
Roel Kluin3cf0c502007-10-27 00:20:36 +0200877 BUG_ON((!(lockres->l_flags & OCFS2_LOCK_BUSY)));
Mark Fashehccd979b2005-12-15 14:31:24 -0800878 BUG_ON(lockres->l_flags & OCFS2_LOCK_ATTACHED);
879
Joel Beckerbd3e7612008-02-01 12:14:57 -0800880 if (lockres->l_requested > DLM_LOCK_NL &&
Mark Fashehf625c972006-09-12 21:24:53 -0700881 !(lockres->l_flags & OCFS2_LOCK_LOCAL) &&
882 lockres->l_ops->flags & LOCK_TYPE_REQUIRES_REFRESH)
Mark Fashehccd979b2005-12-15 14:31:24 -0800883 lockres_or_flags(lockres, OCFS2_LOCK_NEEDS_REFRESH);
884
885 lockres->l_level = lockres->l_requested;
886 lockres_or_flags(lockres, OCFS2_LOCK_ATTACHED);
887 lockres_clear_flags(lockres, OCFS2_LOCK_BUSY);
Mark Fashehccd979b2005-12-15 14:31:24 -0800888}
889
Mark Fashehccd979b2005-12-15 14:31:24 -0800890static int ocfs2_generic_handle_bast(struct ocfs2_lock_res *lockres,
891 int level)
892{
893 int needs_downconvert = 0;
Mark Fashehccd979b2005-12-15 14:31:24 -0800894
895 assert_spin_locked(&lockres->l_lock);
896
Mark Fashehccd979b2005-12-15 14:31:24 -0800897 if (level > lockres->l_blocking) {
898 /* only schedule a downconvert if we haven't already scheduled
899 * one that goes low enough to satisfy the level we're
900 * blocking. this also catches the case where we get
901 * duplicate BASTs */
902 if (ocfs2_highest_compat_lock_level(level) <
903 ocfs2_highest_compat_lock_level(lockres->l_blocking))
904 needs_downconvert = 1;
905
906 lockres->l_blocking = level;
907 }
908
Sunil Mushran9b915182010-02-26 19:42:44 -0800909 mlog(ML_BASTS, "lockres %s, block %d, level %d, l_block %d, dwn %d\n",
910 lockres->l_name, level, lockres->l_level, lockres->l_blocking,
911 needs_downconvert);
912
Wengang Wang0b94a902010-01-21 10:50:02 -0800913 if (needs_downconvert)
914 lockres_or_flags(lockres, OCFS2_LOCK_BLOCKED);
Tao Mac1e8d352011-03-07 16:43:21 +0800915 mlog(0, "needs_downconvert = %d\n", needs_downconvert);
Mark Fashehccd979b2005-12-15 14:31:24 -0800916 return needs_downconvert;
917}
918
Joel Beckerde551242008-02-01 14:45:08 -0800919/*
920 * OCFS2_LOCK_PENDING and l_pending_gen.
921 *
922 * Why does OCFS2_LOCK_PENDING exist? To close a race between setting
923 * OCFS2_LOCK_BUSY and calling ocfs2_dlm_lock(). See ocfs2_unblock_lock()
924 * for more details on the race.
925 *
926 * OCFS2_LOCK_PENDING closes the race quite nicely. However, it introduces
927 * a race on itself. In o2dlm, we can get the ast before ocfs2_dlm_lock()
928 * returns. The ast clears OCFS2_LOCK_BUSY, and must therefore clear
929 * OCFS2_LOCK_PENDING at the same time. When ocfs2_dlm_lock() returns,
930 * the caller is going to try to clear PENDING again. If nothing else is
931 * happening, __lockres_clear_pending() sees PENDING is unset and does
932 * nothing.
933 *
934 * But what if another path (eg downconvert thread) has just started a
935 * new locking action? The other path has re-set PENDING. Our path
936 * cannot clear PENDING, because that will re-open the original race
937 * window.
938 *
939 * [Example]
940 *
941 * ocfs2_meta_lock()
942 * ocfs2_cluster_lock()
943 * set BUSY
944 * set PENDING
945 * drop l_lock
946 * ocfs2_dlm_lock()
947 * ocfs2_locking_ast() ocfs2_downconvert_thread()
948 * clear PENDING ocfs2_unblock_lock()
949 * take_l_lock
950 * !BUSY
951 * ocfs2_prepare_downconvert()
952 * set BUSY
953 * set PENDING
954 * drop l_lock
955 * take l_lock
956 * clear PENDING
957 * drop l_lock
958 * <window>
959 * ocfs2_dlm_lock()
960 *
961 * So as you can see, we now have a window where l_lock is not held,
962 * PENDING is not set, and ocfs2_dlm_lock() has not been called.
963 *
964 * The core problem is that ocfs2_cluster_lock() has cleared the PENDING
965 * set by ocfs2_prepare_downconvert(). That wasn't nice.
966 *
967 * To solve this we introduce l_pending_gen. A call to
968 * lockres_clear_pending() will only do so when it is passed a generation
969 * number that matches the lockres. lockres_set_pending() will return the
970 * current generation number. When ocfs2_cluster_lock() goes to clear
971 * PENDING, it passes the generation it got from set_pending(). In our
972 * example above, the generation numbers will *not* match. Thus,
973 * ocfs2_cluster_lock() will not clear the PENDING set by
974 * ocfs2_prepare_downconvert().
975 */
976
977/* Unlocked version for ocfs2_locking_ast() */
978static void __lockres_clear_pending(struct ocfs2_lock_res *lockres,
979 unsigned int generation,
980 struct ocfs2_super *osb)
981{
982 assert_spin_locked(&lockres->l_lock);
983
984 /*
985 * The ast and locking functions can race us here. The winner
986 * will clear pending, the loser will not.
987 */
988 if (!(lockres->l_flags & OCFS2_LOCK_PENDING) ||
989 (lockres->l_pending_gen != generation))
990 return;
991
992 lockres_clear_flags(lockres, OCFS2_LOCK_PENDING);
993 lockres->l_pending_gen++;
994
995 /*
996 * The downconvert thread may have skipped us because we
997 * were PENDING. Wake it up.
998 */
999 if (lockres->l_flags & OCFS2_LOCK_BLOCKED)
1000 ocfs2_wake_downconvert_thread(osb);
1001}
1002
1003/* Locked version for callers of ocfs2_dlm_lock() */
1004static void lockres_clear_pending(struct ocfs2_lock_res *lockres,
1005 unsigned int generation,
1006 struct ocfs2_super *osb)
1007{
1008 unsigned long flags;
1009
1010 spin_lock_irqsave(&lockres->l_lock, flags);
1011 __lockres_clear_pending(lockres, generation, osb);
1012 spin_unlock_irqrestore(&lockres->l_lock, flags);
1013}
1014
1015static unsigned int lockres_set_pending(struct ocfs2_lock_res *lockres)
1016{
1017 assert_spin_locked(&lockres->l_lock);
1018 BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BUSY));
1019
1020 lockres_or_flags(lockres, OCFS2_LOCK_PENDING);
1021
1022 return lockres->l_pending_gen;
1023}
1024
Joel Beckerc0e41332010-01-29 14:46:44 -08001025static void ocfs2_blocking_ast(struct ocfs2_dlm_lksb *lksb, int level)
Mark Fashehccd979b2005-12-15 14:31:24 -08001026{
Joel Beckera796d282010-01-28 19:22:39 -08001027 struct ocfs2_lock_res *lockres = ocfs2_lksb_to_lock_res(lksb);
Mark Fashehaa2623a2006-09-12 21:58:23 -07001028 struct ocfs2_super *osb = ocfs2_get_lockres_osb(lockres);
Mark Fashehccd979b2005-12-15 14:31:24 -08001029 int needs_downconvert;
1030 unsigned long flags;
1031
Joel Beckerbd3e7612008-02-01 12:14:57 -08001032 BUG_ON(level <= DLM_LOCK_NL);
Mark Fashehccd979b2005-12-15 14:31:24 -08001033
Sunil Mushran9b915182010-02-26 19:42:44 -08001034 mlog(ML_BASTS, "BAST fired for lockres %s, blocking %d, level %d, "
1035 "type %s\n", lockres->l_name, level, lockres->l_level,
Mark Fashehaa2623a2006-09-12 21:58:23 -07001036 ocfs2_lock_type_string(lockres->l_type));
1037
Mark Fashehcf8e06f2007-12-20 16:43:10 -08001038 /*
1039 * We can skip the bast for locks which don't enable caching -
1040 * they'll be dropped at the earliest possible time anyway.
1041 */
1042 if (lockres->l_flags & OCFS2_LOCK_NOCACHE)
1043 return;
1044
Mark Fashehccd979b2005-12-15 14:31:24 -08001045 spin_lock_irqsave(&lockres->l_lock, flags);
1046 needs_downconvert = ocfs2_generic_handle_bast(lockres, level);
1047 if (needs_downconvert)
1048 ocfs2_schedule_blocked_lock(osb, lockres);
1049 spin_unlock_irqrestore(&lockres->l_lock, flags);
1050
Mark Fashehd680efe2006-09-08 14:14:34 -07001051 wake_up(&lockres->l_event);
1052
Mark Fasheh34d024f2007-09-24 15:56:19 -07001053 ocfs2_wake_downconvert_thread(osb);
Mark Fashehccd979b2005-12-15 14:31:24 -08001054}
1055
Joel Beckerc0e41332010-01-29 14:46:44 -08001056static void ocfs2_locking_ast(struct ocfs2_dlm_lksb *lksb)
Mark Fashehccd979b2005-12-15 14:31:24 -08001057{
Joel Beckera796d282010-01-28 19:22:39 -08001058 struct ocfs2_lock_res *lockres = ocfs2_lksb_to_lock_res(lksb);
Joel Beckerde551242008-02-01 14:45:08 -08001059 struct ocfs2_super *osb = ocfs2_get_lockres_osb(lockres);
Mark Fashehccd979b2005-12-15 14:31:24 -08001060 unsigned long flags;
David Teigland1693a5c2008-01-30 16:52:53 -08001061 int status;
Mark Fashehccd979b2005-12-15 14:31:24 -08001062
1063 spin_lock_irqsave(&lockres->l_lock, flags);
1064
David Teigland1693a5c2008-01-30 16:52:53 -08001065 status = ocfs2_dlm_lock_status(&lockres->l_lksb);
1066
1067 if (status == -EAGAIN) {
1068 lockres_clear_flags(lockres, OCFS2_LOCK_BUSY);
1069 goto out;
1070 }
1071
1072 if (status) {
Joel Becker8f2c9c12008-02-01 12:16:57 -08001073 mlog(ML_ERROR, "lockres %s: lksb status value of %d!\n",
David Teigland1693a5c2008-01-30 16:52:53 -08001074 lockres->l_name, status);
Mark Fashehccd979b2005-12-15 14:31:24 -08001075 spin_unlock_irqrestore(&lockres->l_lock, flags);
1076 return;
1077 }
1078
Sunil Mushran9b915182010-02-26 19:42:44 -08001079 mlog(ML_BASTS, "AST fired for lockres %s, action %d, unlock %d, "
1080 "level %d => %d\n", lockres->l_name, lockres->l_action,
1081 lockres->l_unlock_action, lockres->l_level, lockres->l_requested);
1082
Mark Fashehccd979b2005-12-15 14:31:24 -08001083 switch(lockres->l_action) {
1084 case OCFS2_AST_ATTACH:
1085 ocfs2_generic_handle_attach_action(lockres);
Mark Fashehe92d57d2006-09-12 21:34:35 -07001086 lockres_clear_flags(lockres, OCFS2_LOCK_LOCAL);
Mark Fashehccd979b2005-12-15 14:31:24 -08001087 break;
1088 case OCFS2_AST_CONVERT:
1089 ocfs2_generic_handle_convert_action(lockres);
1090 break;
1091 case OCFS2_AST_DOWNCONVERT:
1092 ocfs2_generic_handle_downconvert_action(lockres);
1093 break;
1094 default:
Sunil Mushran9b915182010-02-26 19:42:44 -08001095 mlog(ML_ERROR, "lockres %s: AST fired with invalid action: %u, "
1096 "flags 0x%lx, unlock: %u\n",
Mark Fashehe92d57d2006-09-12 21:34:35 -07001097 lockres->l_name, lockres->l_action, lockres->l_flags,
1098 lockres->l_unlock_action);
Mark Fashehccd979b2005-12-15 14:31:24 -08001099 BUG();
1100 }
David Teigland1693a5c2008-01-30 16:52:53 -08001101out:
Mark Fashehccd979b2005-12-15 14:31:24 -08001102 /* set it to something invalid so if we get called again we
1103 * can catch it. */
1104 lockres->l_action = OCFS2_AST_INVALID;
Mark Fashehccd979b2005-12-15 14:31:24 -08001105
Joel Beckerde551242008-02-01 14:45:08 -08001106 /* Did we try to cancel this lock? Clear that state */
1107 if (lockres->l_unlock_action == OCFS2_UNLOCK_CANCEL_CONVERT)
1108 lockres->l_unlock_action = OCFS2_UNLOCK_INVALID;
1109
1110 /*
1111 * We may have beaten the locking functions here. We certainly
1112 * know that dlm_lock() has been called :-)
1113 * Because we can't have two lock calls in flight at once, we
1114 * can use lockres->l_pending_gen.
1115 */
1116 __lockres_clear_pending(lockres, lockres->l_pending_gen, osb);
1117
Mark Fashehccd979b2005-12-15 14:31:24 -08001118 wake_up(&lockres->l_event);
Mark Fashehd680efe2006-09-08 14:14:34 -07001119 spin_unlock_irqrestore(&lockres->l_lock, flags);
Mark Fashehccd979b2005-12-15 14:31:24 -08001120}
1121
Joel Becker553b5eb2010-01-29 17:19:06 -08001122static void ocfs2_unlock_ast(struct ocfs2_dlm_lksb *lksb, int error)
1123{
1124 struct ocfs2_lock_res *lockres = ocfs2_lksb_to_lock_res(lksb);
1125 unsigned long flags;
1126
Sunil Mushran9b915182010-02-26 19:42:44 -08001127 mlog(ML_BASTS, "UNLOCK AST fired for lockres %s, action = %d\n",
1128 lockres->l_name, lockres->l_unlock_action);
Joel Becker553b5eb2010-01-29 17:19:06 -08001129
1130 spin_lock_irqsave(&lockres->l_lock, flags);
1131 if (error) {
1132 mlog(ML_ERROR, "Dlm passes error %d for lock %s, "
1133 "unlock_action %d\n", error, lockres->l_name,
1134 lockres->l_unlock_action);
1135 spin_unlock_irqrestore(&lockres->l_lock, flags);
Joel Becker553b5eb2010-01-29 17:19:06 -08001136 return;
1137 }
1138
1139 switch(lockres->l_unlock_action) {
1140 case OCFS2_UNLOCK_CANCEL_CONVERT:
1141 mlog(0, "Cancel convert success for %s\n", lockres->l_name);
1142 lockres->l_action = OCFS2_AST_INVALID;
1143 /* Downconvert thread may have requeued this lock, we
1144 * need to wake it. */
1145 if (lockres->l_flags & OCFS2_LOCK_BLOCKED)
1146 ocfs2_wake_downconvert_thread(ocfs2_get_lockres_osb(lockres));
1147 break;
1148 case OCFS2_UNLOCK_DROP_LOCK:
1149 lockres->l_level = DLM_LOCK_IV;
1150 break;
1151 default:
1152 BUG();
1153 }
1154
1155 lockres_clear_flags(lockres, OCFS2_LOCK_BUSY);
1156 lockres->l_unlock_action = OCFS2_UNLOCK_INVALID;
1157 wake_up(&lockres->l_event);
1158 spin_unlock_irqrestore(&lockres->l_lock, flags);
Joel Becker553b5eb2010-01-29 17:19:06 -08001159}
1160
1161/*
1162 * This is the filesystem locking protocol. It provides the lock handling
1163 * hooks for the underlying DLM. It has a maximum version number.
1164 * The version number allows interoperability with systems running at
1165 * the same major number and an equal or smaller minor number.
1166 *
1167 * Whenever the filesystem does new things with locks (adds or removes a
1168 * lock, orders them differently, does different things underneath a lock),
1169 * the version must be changed. The protocol is negotiated when joining
1170 * the dlm domain. A node may join the domain if its major version is
1171 * identical to all other nodes and its minor version is greater than
1172 * or equal to all other nodes. When its minor version is greater than
1173 * the other nodes, it will run at the minor version specified by the
1174 * other nodes.
1175 *
1176 * If a locking change is made that will not be compatible with older
1177 * versions, the major number must be increased and the minor version set
1178 * to zero. If a change merely adds a behavior that can be disabled when
1179 * speaking to older versions, the minor version must be increased. If a
1180 * change adds a fully backwards compatible change (eg, LVB changes that
1181 * are just ignored by older versions), the version does not need to be
1182 * updated.
1183 */
1184static struct ocfs2_locking_protocol lproto = {
1185 .lp_max_version = {
1186 .pv_major = OCFS2_LOCKING_PROTOCOL_MAJOR,
1187 .pv_minor = OCFS2_LOCKING_PROTOCOL_MINOR,
1188 },
1189 .lp_lock_ast = ocfs2_locking_ast,
1190 .lp_blocking_ast = ocfs2_blocking_ast,
1191 .lp_unlock_ast = ocfs2_unlock_ast,
1192};
1193
1194void ocfs2_set_locking_protocol(void)
1195{
1196 ocfs2_stack_glue_set_max_proto_version(&lproto.lp_max_version);
1197}
1198
Mark Fashehccd979b2005-12-15 14:31:24 -08001199static inline void ocfs2_recover_from_dlm_error(struct ocfs2_lock_res *lockres,
1200 int convert)
1201{
1202 unsigned long flags;
1203
Mark Fashehccd979b2005-12-15 14:31:24 -08001204 spin_lock_irqsave(&lockres->l_lock, flags);
1205 lockres_clear_flags(lockres, OCFS2_LOCK_BUSY);
Sunil Mushrana1912822010-01-21 10:50:03 -08001206 lockres_clear_flags(lockres, OCFS2_LOCK_UPCONVERT_FINISHING);
Mark Fashehccd979b2005-12-15 14:31:24 -08001207 if (convert)
1208 lockres->l_action = OCFS2_AST_INVALID;
1209 else
1210 lockres->l_unlock_action = OCFS2_UNLOCK_INVALID;
1211 spin_unlock_irqrestore(&lockres->l_lock, flags);
1212
1213 wake_up(&lockres->l_event);
Mark Fashehccd979b2005-12-15 14:31:24 -08001214}
1215
1216/* Note: If we detect another process working on the lock (i.e.,
1217 * OCFS2_LOCK_BUSY), we'll bail out returning 0. It's up to the caller
1218 * to do the right thing in that case.
1219 */
1220static int ocfs2_lock_create(struct ocfs2_super *osb,
1221 struct ocfs2_lock_res *lockres,
1222 int level,
Joel Beckerbd3e7612008-02-01 12:14:57 -08001223 u32 dlm_flags)
Mark Fashehccd979b2005-12-15 14:31:24 -08001224{
1225 int ret = 0;
Mark Fashehccd979b2005-12-15 14:31:24 -08001226 unsigned long flags;
Joel Beckerde551242008-02-01 14:45:08 -08001227 unsigned int gen;
Mark Fashehccd979b2005-12-15 14:31:24 -08001228
Joel Beckerbd3e7612008-02-01 12:14:57 -08001229 mlog(0, "lock %s, level = %d, flags = %u\n", lockres->l_name, level,
Mark Fashehccd979b2005-12-15 14:31:24 -08001230 dlm_flags);
1231
1232 spin_lock_irqsave(&lockres->l_lock, flags);
1233 if ((lockres->l_flags & OCFS2_LOCK_ATTACHED) ||
1234 (lockres->l_flags & OCFS2_LOCK_BUSY)) {
1235 spin_unlock_irqrestore(&lockres->l_lock, flags);
1236 goto bail;
1237 }
1238
1239 lockres->l_action = OCFS2_AST_ATTACH;
1240 lockres->l_requested = level;
1241 lockres_or_flags(lockres, OCFS2_LOCK_BUSY);
Joel Beckerde551242008-02-01 14:45:08 -08001242 gen = lockres_set_pending(lockres);
Mark Fashehccd979b2005-12-15 14:31:24 -08001243 spin_unlock_irqrestore(&lockres->l_lock, flags);
1244
Joel Becker4670c462008-02-01 14:39:35 -08001245 ret = ocfs2_dlm_lock(osb->cconn,
Joel Becker7431cd72008-02-01 12:15:37 -08001246 level,
1247 &lockres->l_lksb,
1248 dlm_flags,
1249 lockres->l_name,
Joel Beckera796d282010-01-28 19:22:39 -08001250 OCFS2_LOCK_ID_MAX_LEN - 1);
Joel Beckerde551242008-02-01 14:45:08 -08001251 lockres_clear_pending(lockres, gen, osb);
Joel Becker7431cd72008-02-01 12:15:37 -08001252 if (ret) {
1253 ocfs2_log_dlm_error("ocfs2_dlm_lock", ret, lockres);
Mark Fashehccd979b2005-12-15 14:31:24 -08001254 ocfs2_recover_from_dlm_error(lockres, 1);
1255 }
1256
Joel Becker7431cd72008-02-01 12:15:37 -08001257 mlog(0, "lock %s, return from ocfs2_dlm_lock\n", lockres->l_name);
Mark Fashehccd979b2005-12-15 14:31:24 -08001258
1259bail:
Mark Fashehccd979b2005-12-15 14:31:24 -08001260 return ret;
1261}
1262
1263static inline int ocfs2_check_wait_flag(struct ocfs2_lock_res *lockres,
1264 int flag)
1265{
1266 unsigned long flags;
1267 int ret;
1268
1269 spin_lock_irqsave(&lockres->l_lock, flags);
1270 ret = lockres->l_flags & flag;
1271 spin_unlock_irqrestore(&lockres->l_lock, flags);
1272
1273 return ret;
1274}
1275
1276static inline void ocfs2_wait_on_busy_lock(struct ocfs2_lock_res *lockres)
1277
1278{
1279 wait_event(lockres->l_event,
1280 !ocfs2_check_wait_flag(lockres, OCFS2_LOCK_BUSY));
1281}
1282
1283static inline void ocfs2_wait_on_refreshing_lock(struct ocfs2_lock_res *lockres)
1284
1285{
1286 wait_event(lockres->l_event,
1287 !ocfs2_check_wait_flag(lockres, OCFS2_LOCK_REFRESHING));
1288}
1289
1290/* predict what lock level we'll be dropping down to on behalf
1291 * of another node, and return true if the currently wanted
1292 * level will be compatible with it. */
1293static inline int ocfs2_may_continue_on_blocked_lock(struct ocfs2_lock_res *lockres,
1294 int wanted)
1295{
1296 BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BLOCKED));
1297
1298 return wanted <= ocfs2_highest_compat_lock_level(lockres->l_blocking);
1299}
1300
1301static void ocfs2_init_mask_waiter(struct ocfs2_mask_waiter *mw)
1302{
1303 INIT_LIST_HEAD(&mw->mw_item);
1304 init_completion(&mw->mw_complete);
Sunil Mushran8ddb7b02008-05-13 13:45:15 -07001305 ocfs2_init_start_time(mw);
Mark Fashehccd979b2005-12-15 14:31:24 -08001306}
1307
1308static int ocfs2_wait_for_mask(struct ocfs2_mask_waiter *mw)
1309{
1310 wait_for_completion(&mw->mw_complete);
1311 /* Re-arm the completion in case we want to wait on it again */
Wolfram Sang16735d02013-11-14 14:32:02 -08001312 reinit_completion(&mw->mw_complete);
Mark Fashehccd979b2005-12-15 14:31:24 -08001313 return mw->mw_status;
1314}
1315
1316static void lockres_add_mask_waiter(struct ocfs2_lock_res *lockres,
1317 struct ocfs2_mask_waiter *mw,
1318 unsigned long mask,
1319 unsigned long goal)
1320{
1321 BUG_ON(!list_empty(&mw->mw_item));
1322
1323 assert_spin_locked(&lockres->l_lock);
1324
1325 list_add_tail(&mw->mw_item, &lockres->l_mask_waiters);
1326 mw->mw_mask = mask;
1327 mw->mw_goal = goal;
1328}
1329
1330/* returns 0 if the mw that was removed was already satisfied, -EBUSY
1331 * if the mask still hadn't reached its goal */
Xue jiufeid1e782382014-12-10 15:41:59 -08001332static int __lockres_remove_mask_waiter(struct ocfs2_lock_res *lockres,
Mark Fashehccd979b2005-12-15 14:31:24 -08001333 struct ocfs2_mask_waiter *mw)
1334{
Mark Fashehccd979b2005-12-15 14:31:24 -08001335 int ret = 0;
1336
Xue jiufeid1e782382014-12-10 15:41:59 -08001337 assert_spin_locked(&lockres->l_lock);
Mark Fashehccd979b2005-12-15 14:31:24 -08001338 if (!list_empty(&mw->mw_item)) {
1339 if ((lockres->l_flags & mw->mw_mask) != mw->mw_goal)
1340 ret = -EBUSY;
1341
1342 list_del_init(&mw->mw_item);
1343 init_completion(&mw->mw_complete);
1344 }
Xue jiufeid1e782382014-12-10 15:41:59 -08001345
1346 return ret;
1347}
1348
1349static int lockres_remove_mask_waiter(struct ocfs2_lock_res *lockres,
1350 struct ocfs2_mask_waiter *mw)
1351{
1352 unsigned long flags;
1353 int ret = 0;
1354
1355 spin_lock_irqsave(&lockres->l_lock, flags);
1356 ret = __lockres_remove_mask_waiter(lockres, mw);
Mark Fashehccd979b2005-12-15 14:31:24 -08001357 spin_unlock_irqrestore(&lockres->l_lock, flags);
1358
1359 return ret;
1360
1361}
1362
Mark Fashehcf8e06f2007-12-20 16:43:10 -08001363static int ocfs2_wait_for_mask_interruptible(struct ocfs2_mask_waiter *mw,
1364 struct ocfs2_lock_res *lockres)
1365{
1366 int ret;
1367
1368 ret = wait_for_completion_interruptible(&mw->mw_complete);
1369 if (ret)
1370 lockres_remove_mask_waiter(lockres, mw);
1371 else
1372 ret = mw->mw_status;
1373 /* Re-arm the completion in case we want to wait on it again */
Wolfram Sang16735d02013-11-14 14:32:02 -08001374 reinit_completion(&mw->mw_complete);
Mark Fashehcf8e06f2007-12-20 16:43:10 -08001375 return ret;
1376}
1377
Jan Karacb257972009-06-04 15:26:50 +02001378static int __ocfs2_cluster_lock(struct ocfs2_super *osb,
1379 struct ocfs2_lock_res *lockres,
1380 int level,
1381 u32 lkm_flags,
1382 int arg_flags,
1383 int l_subclass,
1384 unsigned long caller_ip)
Mark Fashehccd979b2005-12-15 14:31:24 -08001385{
1386 struct ocfs2_mask_waiter mw;
Mark Fashehccd979b2005-12-15 14:31:24 -08001387 int wait, catch_signals = !(osb->s_mount_opt & OCFS2_MOUNT_NOINTR);
1388 int ret = 0; /* gcc doesn't realize wait = 1 guarantees ret is set */
1389 unsigned long flags;
Joel Beckerde551242008-02-01 14:45:08 -08001390 unsigned int gen;
David Teigland1693a5c2008-01-30 16:52:53 -08001391 int noqueue_attempted = 0;
Xue jiufeid1e782382014-12-10 15:41:59 -08001392 int dlm_locked = 0;
Mark Fashehccd979b2005-12-15 14:31:24 -08001393
Mark Fashehccd979b2005-12-15 14:31:24 -08001394 ocfs2_init_mask_waiter(&mw);
1395
Mark Fashehb80fc012006-09-12 22:08:14 -07001396 if (lockres->l_ops->flags & LOCK_TYPE_USES_LVB)
Joel Beckerbd3e7612008-02-01 12:14:57 -08001397 lkm_flags |= DLM_LKF_VALBLK;
Mark Fashehb80fc012006-09-12 22:08:14 -07001398
Mark Fashehccd979b2005-12-15 14:31:24 -08001399again:
1400 wait = 0;
1401
Sunil Mushrana1912822010-01-21 10:50:03 -08001402 spin_lock_irqsave(&lockres->l_lock, flags);
1403
Mark Fashehccd979b2005-12-15 14:31:24 -08001404 if (catch_signals && signal_pending(current)) {
1405 ret = -ERESTARTSYS;
Sunil Mushrana1912822010-01-21 10:50:03 -08001406 goto unlock;
Mark Fashehccd979b2005-12-15 14:31:24 -08001407 }
1408
Mark Fashehccd979b2005-12-15 14:31:24 -08001409 mlog_bug_on_msg(lockres->l_flags & OCFS2_LOCK_FREEING,
1410 "Cluster lock called on freeing lockres %s! flags "
1411 "0x%lx\n", lockres->l_name, lockres->l_flags);
1412
1413 /* We only compare against the currently granted level
1414 * here. If the lock is blocked waiting on a downconvert,
1415 * we'll get caught below. */
1416 if (lockres->l_flags & OCFS2_LOCK_BUSY &&
1417 level > lockres->l_level) {
1418 /* is someone sitting in dlm_lock? If so, wait on
1419 * them. */
1420 lockres_add_mask_waiter(lockres, &mw, OCFS2_LOCK_BUSY, 0);
1421 wait = 1;
1422 goto unlock;
1423 }
1424
Sunil Mushrana1912822010-01-21 10:50:03 -08001425 if (lockres->l_flags & OCFS2_LOCK_UPCONVERT_FINISHING) {
1426 /*
1427 * We've upconverted. If the lock now has a level we can
1428 * work with, we take it. If, however, the lock is not at the
1429 * required level, we go thru the full cycle. One way this could
1430 * happen is if a process requesting an upconvert to PR is
1431 * closely followed by another requesting upconvert to an EX.
1432 * If the process requesting EX lands here, we want it to
1433 * continue attempting to upconvert and let the process
1434 * requesting PR take the lock.
1435 * If multiple processes request upconvert to PR, the first one
1436 * here will take the lock. The others will have to go thru the
1437 * OCFS2_LOCK_BLOCKED check to ensure that there is no pending
1438 * downconvert request.
1439 */
1440 if (level <= lockres->l_level)
1441 goto update_holders;
1442 }
1443
Mark Fashehccd979b2005-12-15 14:31:24 -08001444 if (lockres->l_flags & OCFS2_LOCK_BLOCKED &&
1445 !ocfs2_may_continue_on_blocked_lock(lockres, level)) {
1446 /* is the lock is currently blocked on behalf of
1447 * another node */
1448 lockres_add_mask_waiter(lockres, &mw, OCFS2_LOCK_BLOCKED, 0);
1449 wait = 1;
1450 goto unlock;
1451 }
1452
1453 if (level > lockres->l_level) {
David Teigland1693a5c2008-01-30 16:52:53 -08001454 if (noqueue_attempted > 0) {
1455 ret = -EAGAIN;
1456 goto unlock;
1457 }
1458 if (lkm_flags & DLM_LKF_NOQUEUE)
1459 noqueue_attempted = 1;
1460
Mark Fashehccd979b2005-12-15 14:31:24 -08001461 if (lockres->l_action != OCFS2_AST_INVALID)
1462 mlog(ML_ERROR, "lockres %s has action %u pending\n",
1463 lockres->l_name, lockres->l_action);
1464
Mark Fasheh019d1b22007-10-05 12:09:05 -07001465 if (!(lockres->l_flags & OCFS2_LOCK_ATTACHED)) {
1466 lockres->l_action = OCFS2_AST_ATTACH;
Joel Beckerbd3e7612008-02-01 12:14:57 -08001467 lkm_flags &= ~DLM_LKF_CONVERT;
Mark Fasheh019d1b22007-10-05 12:09:05 -07001468 } else {
1469 lockres->l_action = OCFS2_AST_CONVERT;
Joel Beckerbd3e7612008-02-01 12:14:57 -08001470 lkm_flags |= DLM_LKF_CONVERT;
Mark Fasheh019d1b22007-10-05 12:09:05 -07001471 }
1472
Mark Fashehccd979b2005-12-15 14:31:24 -08001473 lockres->l_requested = level;
1474 lockres_or_flags(lockres, OCFS2_LOCK_BUSY);
Joel Beckerde551242008-02-01 14:45:08 -08001475 gen = lockres_set_pending(lockres);
Mark Fashehccd979b2005-12-15 14:31:24 -08001476 spin_unlock_irqrestore(&lockres->l_lock, flags);
1477
Joel Beckerbd3e7612008-02-01 12:14:57 -08001478 BUG_ON(level == DLM_LOCK_IV);
1479 BUG_ON(level == DLM_LOCK_NL);
Mark Fashehccd979b2005-12-15 14:31:24 -08001480
Sunil Mushran9b915182010-02-26 19:42:44 -08001481 mlog(ML_BASTS, "lockres %s, convert from %d to %d\n",
Mark Fashehccd979b2005-12-15 14:31:24 -08001482 lockres->l_name, lockres->l_level, level);
1483
1484 /* call dlm_lock to upgrade lock now */
Joel Becker4670c462008-02-01 14:39:35 -08001485 ret = ocfs2_dlm_lock(osb->cconn,
Joel Becker7431cd72008-02-01 12:15:37 -08001486 level,
1487 &lockres->l_lksb,
1488 lkm_flags,
1489 lockres->l_name,
Joel Beckera796d282010-01-28 19:22:39 -08001490 OCFS2_LOCK_ID_MAX_LEN - 1);
Joel Beckerde551242008-02-01 14:45:08 -08001491 lockres_clear_pending(lockres, gen, osb);
Joel Becker7431cd72008-02-01 12:15:37 -08001492 if (ret) {
1493 if (!(lkm_flags & DLM_LKF_NOQUEUE) ||
1494 (ret != -EAGAIN)) {
Joel Becker24ef1812008-01-29 17:37:32 -08001495 ocfs2_log_dlm_error("ocfs2_dlm_lock",
Joel Becker7431cd72008-02-01 12:15:37 -08001496 ret, lockres);
Mark Fashehccd979b2005-12-15 14:31:24 -08001497 }
1498 ocfs2_recover_from_dlm_error(lockres, 1);
1499 goto out;
1500 }
Xue jiufeid1e782382014-12-10 15:41:59 -08001501 dlm_locked = 1;
Mark Fashehccd979b2005-12-15 14:31:24 -08001502
Coly Li73ac36e2009-01-07 18:09:16 -08001503 mlog(0, "lock %s, successful return from ocfs2_dlm_lock\n",
Mark Fashehccd979b2005-12-15 14:31:24 -08001504 lockres->l_name);
1505
1506 /* At this point we've gone inside the dlm and need to
1507 * complete our work regardless. */
1508 catch_signals = 0;
1509
1510 /* wait for busy to clear and carry on */
1511 goto again;
1512 }
1513
Sunil Mushrana1912822010-01-21 10:50:03 -08001514update_holders:
Mark Fashehccd979b2005-12-15 14:31:24 -08001515 /* Ok, if we get here then we're good to go. */
1516 ocfs2_inc_holders(lockres, level);
1517
1518 ret = 0;
1519unlock:
Sunil Mushrana1912822010-01-21 10:50:03 -08001520 lockres_clear_flags(lockres, OCFS2_LOCK_UPCONVERT_FINISHING);
1521
Mark Fashehccd979b2005-12-15 14:31:24 -08001522 spin_unlock_irqrestore(&lockres->l_lock, flags);
1523out:
1524 /*
1525 * This is helping work around a lock inversion between the page lock
1526 * and dlm locks. One path holds the page lock while calling aops
1527 * which block acquiring dlm locks. The voting thread holds dlm
1528 * locks while acquiring page locks while down converting data locks.
1529 * This block is helping an aop path notice the inversion and back
1530 * off to unlock its page lock before trying the dlm lock again.
1531 */
1532 if (wait && arg_flags & OCFS2_LOCK_NONBLOCK &&
1533 mw.mw_mask & (OCFS2_LOCK_BUSY|OCFS2_LOCK_BLOCKED)) {
1534 wait = 0;
Xue jiufeid1e782382014-12-10 15:41:59 -08001535 spin_lock_irqsave(&lockres->l_lock, flags);
1536 if (__lockres_remove_mask_waiter(lockres, &mw)) {
1537 if (dlm_locked)
1538 lockres_or_flags(lockres,
1539 OCFS2_LOCK_NONBLOCK_FINISHED);
1540 spin_unlock_irqrestore(&lockres->l_lock, flags);
Mark Fashehccd979b2005-12-15 14:31:24 -08001541 ret = -EAGAIN;
Xue jiufeid1e782382014-12-10 15:41:59 -08001542 } else {
1543 spin_unlock_irqrestore(&lockres->l_lock, flags);
Mark Fashehccd979b2005-12-15 14:31:24 -08001544 goto again;
Xue jiufeid1e782382014-12-10 15:41:59 -08001545 }
Mark Fashehccd979b2005-12-15 14:31:24 -08001546 }
1547 if (wait) {
1548 ret = ocfs2_wait_for_mask(&mw);
1549 if (ret == 0)
1550 goto again;
1551 mlog_errno(ret);
1552 }
Sunil Mushran8ddb7b02008-05-13 13:45:15 -07001553 ocfs2_update_lock_stats(lockres, level, &mw, ret);
Mark Fashehccd979b2005-12-15 14:31:24 -08001554
Jan Karacb257972009-06-04 15:26:50 +02001555#ifdef CONFIG_DEBUG_LOCK_ALLOC
1556 if (!ret && lockres->l_lockdep_map.key != NULL) {
1557 if (level == DLM_LOCK_PR)
1558 rwsem_acquire_read(&lockres->l_lockdep_map, l_subclass,
1559 !!(arg_flags & OCFS2_META_LOCK_NOQUEUE),
1560 caller_ip);
1561 else
1562 rwsem_acquire(&lockres->l_lockdep_map, l_subclass,
1563 !!(arg_flags & OCFS2_META_LOCK_NOQUEUE),
1564 caller_ip);
1565 }
1566#endif
Mark Fashehccd979b2005-12-15 14:31:24 -08001567 return ret;
1568}
1569
Jan Karacb257972009-06-04 15:26:50 +02001570static inline int ocfs2_cluster_lock(struct ocfs2_super *osb,
1571 struct ocfs2_lock_res *lockres,
1572 int level,
1573 u32 lkm_flags,
1574 int arg_flags)
1575{
1576 return __ocfs2_cluster_lock(osb, lockres, level, lkm_flags, arg_flags,
1577 0, _RET_IP_);
1578}
1579
1580
1581static void __ocfs2_cluster_unlock(struct ocfs2_super *osb,
1582 struct ocfs2_lock_res *lockres,
1583 int level,
1584 unsigned long caller_ip)
Mark Fashehccd979b2005-12-15 14:31:24 -08001585{
1586 unsigned long flags;
1587
Mark Fashehccd979b2005-12-15 14:31:24 -08001588 spin_lock_irqsave(&lockres->l_lock, flags);
1589 ocfs2_dec_holders(lockres, level);
Mark Fasheh34d024f2007-09-24 15:56:19 -07001590 ocfs2_downconvert_on_unlock(osb, lockres);
Mark Fashehccd979b2005-12-15 14:31:24 -08001591 spin_unlock_irqrestore(&lockres->l_lock, flags);
Jan Karacb257972009-06-04 15:26:50 +02001592#ifdef CONFIG_DEBUG_LOCK_ALLOC
1593 if (lockres->l_lockdep_map.key != NULL)
1594 rwsem_release(&lockres->l_lockdep_map, 1, caller_ip);
1595#endif
Mark Fashehccd979b2005-12-15 14:31:24 -08001596}
1597
Adrian Bunkda661162006-11-20 03:24:28 +01001598static int ocfs2_create_new_lock(struct ocfs2_super *osb,
1599 struct ocfs2_lock_res *lockres,
1600 int ex,
1601 int local)
Mark Fashehccd979b2005-12-15 14:31:24 -08001602{
Joel Beckerbd3e7612008-02-01 12:14:57 -08001603 int level = ex ? DLM_LOCK_EX : DLM_LOCK_PR;
Mark Fashehccd979b2005-12-15 14:31:24 -08001604 unsigned long flags;
Joel Beckerbd3e7612008-02-01 12:14:57 -08001605 u32 lkm_flags = local ? DLM_LKF_LOCAL : 0;
Mark Fashehccd979b2005-12-15 14:31:24 -08001606
1607 spin_lock_irqsave(&lockres->l_lock, flags);
1608 BUG_ON(lockres->l_flags & OCFS2_LOCK_ATTACHED);
1609 lockres_or_flags(lockres, OCFS2_LOCK_LOCAL);
1610 spin_unlock_irqrestore(&lockres->l_lock, flags);
1611
Mark Fasheh24c19ef2006-09-22 17:28:19 -07001612 return ocfs2_lock_create(osb, lockres, level, lkm_flags);
Mark Fashehccd979b2005-12-15 14:31:24 -08001613}
1614
1615/* Grants us an EX lock on the data and metadata resources, skipping
1616 * the normal cluster directory lookup. Use this ONLY on newly created
1617 * inodes which other nodes can't possibly see, and which haven't been
1618 * hashed in the inode hash yet. This can give us a good performance
1619 * increase as it'll skip the network broadcast normally associated
1620 * with creating a new lock resource. */
1621int ocfs2_create_new_inode_locks(struct inode *inode)
1622{
1623 int ret;
Mark Fashehd680efe2006-09-08 14:14:34 -07001624 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
Mark Fashehccd979b2005-12-15 14:31:24 -08001625
1626 BUG_ON(!inode);
1627 BUG_ON(!ocfs2_inode_is_new(inode));
1628
Mark Fashehb06970532006-03-03 10:24:33 -08001629 mlog(0, "Inode %llu\n", (unsigned long long)OCFS2_I(inode)->ip_blkno);
Mark Fashehccd979b2005-12-15 14:31:24 -08001630
1631 /* NOTE: That we don't increment any of the holder counts, nor
1632 * do we add anything to a journal handle. Since this is
1633 * supposed to be a new inode which the cluster doesn't know
1634 * about yet, there is no need to. As far as the LVB handling
1635 * is concerned, this is basically like acquiring an EX lock
1636 * on a resource which has an invalid one -- we'll set it
1637 * valid when we release the EX. */
1638
Mark Fasheh24c19ef2006-09-22 17:28:19 -07001639 ret = ocfs2_create_new_lock(osb, &OCFS2_I(inode)->ip_rw_lockres, 1, 1);
Mark Fashehccd979b2005-12-15 14:31:24 -08001640 if (ret) {
1641 mlog_errno(ret);
1642 goto bail;
1643 }
1644
Mark Fasheh24c19ef2006-09-22 17:28:19 -07001645 /*
Joel Beckerbd3e7612008-02-01 12:14:57 -08001646 * We don't want to use DLM_LKF_LOCAL on a meta data lock as they
Mark Fasheh24c19ef2006-09-22 17:28:19 -07001647 * don't use a generation in their lock names.
1648 */
Mark Fashehe63aecb62007-10-18 15:30:42 -07001649 ret = ocfs2_create_new_lock(osb, &OCFS2_I(inode)->ip_inode_lockres, 1, 0);
Mark Fashehccd979b2005-12-15 14:31:24 -08001650 if (ret) {
1651 mlog_errno(ret);
1652 goto bail;
1653 }
1654
Tiger Yang50008632007-03-20 16:01:38 -07001655 ret = ocfs2_create_new_lock(osb, &OCFS2_I(inode)->ip_open_lockres, 0, 0);
1656 if (ret) {
1657 mlog_errno(ret);
1658 goto bail;
1659 }
1660
Mark Fashehccd979b2005-12-15 14:31:24 -08001661bail:
Mark Fashehccd979b2005-12-15 14:31:24 -08001662 return ret;
1663}
1664
1665int ocfs2_rw_lock(struct inode *inode, int write)
1666{
1667 int status, level;
1668 struct ocfs2_lock_res *lockres;
Sunil Mushranc271c5c2006-12-05 17:56:35 -08001669 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
Mark Fashehccd979b2005-12-15 14:31:24 -08001670
1671 BUG_ON(!inode);
1672
Mark Fashehb06970532006-03-03 10:24:33 -08001673 mlog(0, "inode %llu take %s RW lock\n",
1674 (unsigned long long)OCFS2_I(inode)->ip_blkno,
Mark Fashehccd979b2005-12-15 14:31:24 -08001675 write ? "EXMODE" : "PRMODE");
1676
Tao Mac1e8d352011-03-07 16:43:21 +08001677 if (ocfs2_mount_local(osb))
Sunil Mushranc271c5c2006-12-05 17:56:35 -08001678 return 0;
1679
Mark Fashehccd979b2005-12-15 14:31:24 -08001680 lockres = &OCFS2_I(inode)->ip_rw_lockres;
1681
Joel Beckerbd3e7612008-02-01 12:14:57 -08001682 level = write ? DLM_LOCK_EX : DLM_LOCK_PR;
Mark Fashehccd979b2005-12-15 14:31:24 -08001683
1684 status = ocfs2_cluster_lock(OCFS2_SB(inode->i_sb), lockres, level, 0,
1685 0);
1686 if (status < 0)
1687 mlog_errno(status);
1688
Mark Fashehccd979b2005-12-15 14:31:24 -08001689 return status;
1690}
1691
1692void ocfs2_rw_unlock(struct inode *inode, int write)
1693{
Joel Beckerbd3e7612008-02-01 12:14:57 -08001694 int level = write ? DLM_LOCK_EX : DLM_LOCK_PR;
Mark Fashehccd979b2005-12-15 14:31:24 -08001695 struct ocfs2_lock_res *lockres = &OCFS2_I(inode)->ip_rw_lockres;
Sunil Mushranc271c5c2006-12-05 17:56:35 -08001696 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
Mark Fashehccd979b2005-12-15 14:31:24 -08001697
Mark Fashehb06970532006-03-03 10:24:33 -08001698 mlog(0, "inode %llu drop %s RW lock\n",
1699 (unsigned long long)OCFS2_I(inode)->ip_blkno,
Mark Fashehccd979b2005-12-15 14:31:24 -08001700 write ? "EXMODE" : "PRMODE");
1701
Sunil Mushranc271c5c2006-12-05 17:56:35 -08001702 if (!ocfs2_mount_local(osb))
1703 ocfs2_cluster_unlock(OCFS2_SB(inode->i_sb), lockres, level);
Mark Fashehccd979b2005-12-15 14:31:24 -08001704}
1705
Tiger Yang50008632007-03-20 16:01:38 -07001706/*
1707 * ocfs2_open_lock always get PR mode lock.
1708 */
1709int ocfs2_open_lock(struct inode *inode)
1710{
1711 int status = 0;
1712 struct ocfs2_lock_res *lockres;
1713 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1714
1715 BUG_ON(!inode);
1716
Tiger Yang50008632007-03-20 16:01:38 -07001717 mlog(0, "inode %llu take PRMODE open lock\n",
1718 (unsigned long long)OCFS2_I(inode)->ip_blkno);
1719
Tiger Yang03efed82011-05-28 00:34:19 +08001720 if (ocfs2_is_hard_readonly(osb) || ocfs2_mount_local(osb))
Tiger Yang50008632007-03-20 16:01:38 -07001721 goto out;
1722
1723 lockres = &OCFS2_I(inode)->ip_open_lockres;
1724
1725 status = ocfs2_cluster_lock(OCFS2_SB(inode->i_sb), lockres,
Joel Beckerbd3e7612008-02-01 12:14:57 -08001726 DLM_LOCK_PR, 0, 0);
Tiger Yang50008632007-03-20 16:01:38 -07001727 if (status < 0)
1728 mlog_errno(status);
1729
1730out:
Tiger Yang50008632007-03-20 16:01:38 -07001731 return status;
1732}
1733
1734int ocfs2_try_open_lock(struct inode *inode, int write)
1735{
1736 int status = 0, level;
1737 struct ocfs2_lock_res *lockres;
1738 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1739
1740 BUG_ON(!inode);
1741
Tiger Yang50008632007-03-20 16:01:38 -07001742 mlog(0, "inode %llu try to take %s open lock\n",
1743 (unsigned long long)OCFS2_I(inode)->ip_blkno,
1744 write ? "EXMODE" : "PRMODE");
1745
Tiger Yang03efed82011-05-28 00:34:19 +08001746 if (ocfs2_is_hard_readonly(osb)) {
1747 if (write)
1748 status = -EROFS;
1749 goto out;
1750 }
1751
Tiger Yang50008632007-03-20 16:01:38 -07001752 if (ocfs2_mount_local(osb))
1753 goto out;
1754
1755 lockres = &OCFS2_I(inode)->ip_open_lockres;
1756
Joel Beckerbd3e7612008-02-01 12:14:57 -08001757 level = write ? DLM_LOCK_EX : DLM_LOCK_PR;
Tiger Yang50008632007-03-20 16:01:38 -07001758
1759 /*
1760 * The file system may already holding a PRMODE/EXMODE open lock.
Joel Beckerbd3e7612008-02-01 12:14:57 -08001761 * Since we pass DLM_LKF_NOQUEUE, the request won't block waiting on
Tiger Yang50008632007-03-20 16:01:38 -07001762 * other nodes and the -EAGAIN will indicate to the caller that
1763 * this inode is still in use.
1764 */
1765 status = ocfs2_cluster_lock(OCFS2_SB(inode->i_sb), lockres,
Joel Beckerbd3e7612008-02-01 12:14:57 -08001766 level, DLM_LKF_NOQUEUE, 0);
Tiger Yang50008632007-03-20 16:01:38 -07001767
1768out:
Tiger Yang50008632007-03-20 16:01:38 -07001769 return status;
1770}
1771
1772/*
1773 * ocfs2_open_unlock unlock PR and EX mode open locks.
1774 */
1775void ocfs2_open_unlock(struct inode *inode)
1776{
1777 struct ocfs2_lock_res *lockres = &OCFS2_I(inode)->ip_open_lockres;
1778 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1779
Tiger Yang50008632007-03-20 16:01:38 -07001780 mlog(0, "inode %llu drop open lock\n",
1781 (unsigned long long)OCFS2_I(inode)->ip_blkno);
1782
1783 if (ocfs2_mount_local(osb))
1784 goto out;
1785
1786 if(lockres->l_ro_holders)
1787 ocfs2_cluster_unlock(OCFS2_SB(inode->i_sb), lockres,
Joel Beckerbd3e7612008-02-01 12:14:57 -08001788 DLM_LOCK_PR);
Tiger Yang50008632007-03-20 16:01:38 -07001789 if(lockres->l_ex_holders)
1790 ocfs2_cluster_unlock(OCFS2_SB(inode->i_sb), lockres,
Joel Beckerbd3e7612008-02-01 12:14:57 -08001791 DLM_LOCK_EX);
Tiger Yang50008632007-03-20 16:01:38 -07001792
1793out:
Tao Mac1e8d352011-03-07 16:43:21 +08001794 return;
Tiger Yang50008632007-03-20 16:01:38 -07001795}
1796
Mark Fashehcf8e06f2007-12-20 16:43:10 -08001797static int ocfs2_flock_handle_signal(struct ocfs2_lock_res *lockres,
1798 int level)
1799{
1800 int ret;
1801 struct ocfs2_super *osb = ocfs2_get_lockres_osb(lockres);
1802 unsigned long flags;
1803 struct ocfs2_mask_waiter mw;
1804
1805 ocfs2_init_mask_waiter(&mw);
1806
1807retry_cancel:
1808 spin_lock_irqsave(&lockres->l_lock, flags);
1809 if (lockres->l_flags & OCFS2_LOCK_BUSY) {
1810 ret = ocfs2_prepare_cancel_convert(osb, lockres);
1811 if (ret) {
1812 spin_unlock_irqrestore(&lockres->l_lock, flags);
1813 ret = ocfs2_cancel_convert(osb, lockres);
1814 if (ret < 0) {
1815 mlog_errno(ret);
1816 goto out;
1817 }
1818 goto retry_cancel;
1819 }
1820 lockres_add_mask_waiter(lockres, &mw, OCFS2_LOCK_BUSY, 0);
1821 spin_unlock_irqrestore(&lockres->l_lock, flags);
1822
1823 ocfs2_wait_for_mask(&mw);
1824 goto retry_cancel;
1825 }
1826
1827 ret = -ERESTARTSYS;
1828 /*
1829 * We may still have gotten the lock, in which case there's no
1830 * point to restarting the syscall.
1831 */
1832 if (lockres->l_level == level)
1833 ret = 0;
1834
1835 mlog(0, "Cancel returning %d. flags: 0x%lx, level: %d, act: %d\n", ret,
1836 lockres->l_flags, lockres->l_level, lockres->l_action);
1837
1838 spin_unlock_irqrestore(&lockres->l_lock, flags);
1839
1840out:
1841 return ret;
1842}
1843
1844/*
1845 * ocfs2_file_lock() and ocfs2_file_unlock() map to a single pair of
1846 * flock() calls. The locking approach this requires is sufficiently
1847 * different from all other cluster lock types that we implement a
Daniel Mack3ad2f3f2010-02-03 08:01:28 +08001848 * separate path to the "low-level" dlm calls. In particular:
Mark Fashehcf8e06f2007-12-20 16:43:10 -08001849 *
1850 * - No optimization of lock levels is done - we take at exactly
1851 * what's been requested.
1852 *
1853 * - No lock caching is employed. We immediately downconvert to
1854 * no-lock at unlock time. This also means flock locks never go on
1855 * the blocking list).
1856 *
1857 * - Since userspace can trivially deadlock itself with flock, we make
1858 * sure to allow cancellation of a misbehaving applications flock()
1859 * request.
1860 *
1861 * - Access to any flock lockres doesn't require concurrency, so we
1862 * can simplify the code by requiring the caller to guarantee
1863 * serialization of dlmglue flock calls.
1864 */
1865int ocfs2_file_lock(struct file *file, int ex, int trylock)
1866{
Mark Fashehe988cf12008-07-10 09:25:39 -07001867 int ret, level = ex ? DLM_LOCK_EX : DLM_LOCK_PR;
1868 unsigned int lkm_flags = trylock ? DLM_LKF_NOQUEUE : 0;
Mark Fashehcf8e06f2007-12-20 16:43:10 -08001869 unsigned long flags;
1870 struct ocfs2_file_private *fp = file->private_data;
1871 struct ocfs2_lock_res *lockres = &fp->fp_flock;
1872 struct ocfs2_super *osb = OCFS2_SB(file->f_mapping->host->i_sb);
1873 struct ocfs2_mask_waiter mw;
1874
1875 ocfs2_init_mask_waiter(&mw);
1876
1877 if ((lockres->l_flags & OCFS2_LOCK_BUSY) ||
Joel Beckerbd3e7612008-02-01 12:14:57 -08001878 (lockres->l_level > DLM_LOCK_NL)) {
Mark Fashehcf8e06f2007-12-20 16:43:10 -08001879 mlog(ML_ERROR,
1880 "File lock \"%s\" has busy or locked state: flags: 0x%lx, "
1881 "level: %u\n", lockres->l_name, lockres->l_flags,
1882 lockres->l_level);
1883 return -EINVAL;
1884 }
1885
1886 spin_lock_irqsave(&lockres->l_lock, flags);
1887 if (!(lockres->l_flags & OCFS2_LOCK_ATTACHED)) {
1888 lockres_add_mask_waiter(lockres, &mw, OCFS2_LOCK_BUSY, 0);
1889 spin_unlock_irqrestore(&lockres->l_lock, flags);
1890
1891 /*
1892 * Get the lock at NLMODE to start - that way we
1893 * can cancel the upconvert request if need be.
1894 */
Mark Fashehe988cf12008-07-10 09:25:39 -07001895 ret = ocfs2_lock_create(osb, lockres, DLM_LOCK_NL, 0);
Mark Fashehcf8e06f2007-12-20 16:43:10 -08001896 if (ret < 0) {
1897 mlog_errno(ret);
1898 goto out;
1899 }
1900
1901 ret = ocfs2_wait_for_mask(&mw);
1902 if (ret) {
1903 mlog_errno(ret);
1904 goto out;
1905 }
1906 spin_lock_irqsave(&lockres->l_lock, flags);
1907 }
1908
1909 lockres->l_action = OCFS2_AST_CONVERT;
Mark Fashehe988cf12008-07-10 09:25:39 -07001910 lkm_flags |= DLM_LKF_CONVERT;
Mark Fashehcf8e06f2007-12-20 16:43:10 -08001911 lockres->l_requested = level;
1912 lockres_or_flags(lockres, OCFS2_LOCK_BUSY);
1913
1914 lockres_add_mask_waiter(lockres, &mw, OCFS2_LOCK_BUSY, 0);
1915 spin_unlock_irqrestore(&lockres->l_lock, flags);
1916
Joel Becker4670c462008-02-01 14:39:35 -08001917 ret = ocfs2_dlm_lock(osb->cconn, level, &lockres->l_lksb, lkm_flags,
Joel Beckera796d282010-01-28 19:22:39 -08001918 lockres->l_name, OCFS2_LOCK_ID_MAX_LEN - 1);
Joel Becker7431cd72008-02-01 12:15:37 -08001919 if (ret) {
1920 if (!trylock || (ret != -EAGAIN)) {
Joel Becker24ef1812008-01-29 17:37:32 -08001921 ocfs2_log_dlm_error("ocfs2_dlm_lock", ret, lockres);
Mark Fashehcf8e06f2007-12-20 16:43:10 -08001922 ret = -EINVAL;
1923 }
1924
1925 ocfs2_recover_from_dlm_error(lockres, 1);
1926 lockres_remove_mask_waiter(lockres, &mw);
1927 goto out;
1928 }
1929
1930 ret = ocfs2_wait_for_mask_interruptible(&mw, lockres);
1931 if (ret == -ERESTARTSYS) {
1932 /*
1933 * Userspace can cause deadlock itself with
1934 * flock(). Current behavior locally is to allow the
1935 * deadlock, but abort the system call if a signal is
1936 * received. We follow this example, otherwise a
1937 * poorly written program could sit in kernel until
1938 * reboot.
1939 *
1940 * Handling this is a bit more complicated for Ocfs2
1941 * though. We can't exit this function with an
1942 * outstanding lock request, so a cancel convert is
1943 * required. We intentionally overwrite 'ret' - if the
1944 * cancel fails and the lock was granted, it's easier
André Goddard Rosaaf901ca2009-11-14 13:09:05 -02001945 * to just bubble success back up to the user.
Mark Fashehcf8e06f2007-12-20 16:43:10 -08001946 */
1947 ret = ocfs2_flock_handle_signal(lockres, level);
David Teigland1693a5c2008-01-30 16:52:53 -08001948 } else if (!ret && (level > lockres->l_level)) {
1949 /* Trylock failed asynchronously */
1950 BUG_ON(!trylock);
1951 ret = -EAGAIN;
Mark Fashehcf8e06f2007-12-20 16:43:10 -08001952 }
1953
1954out:
1955
1956 mlog(0, "Lock: \"%s\" ex: %d, trylock: %d, returns: %d\n",
1957 lockres->l_name, ex, trylock, ret);
1958 return ret;
1959}
1960
1961void ocfs2_file_unlock(struct file *file)
1962{
1963 int ret;
Joel Beckerde551242008-02-01 14:45:08 -08001964 unsigned int gen;
Mark Fashehcf8e06f2007-12-20 16:43:10 -08001965 unsigned long flags;
1966 struct ocfs2_file_private *fp = file->private_data;
1967 struct ocfs2_lock_res *lockres = &fp->fp_flock;
1968 struct ocfs2_super *osb = OCFS2_SB(file->f_mapping->host->i_sb);
1969 struct ocfs2_mask_waiter mw;
1970
1971 ocfs2_init_mask_waiter(&mw);
1972
1973 if (!(lockres->l_flags & OCFS2_LOCK_ATTACHED))
1974 return;
1975
Mark Fashehe988cf12008-07-10 09:25:39 -07001976 if (lockres->l_level == DLM_LOCK_NL)
Mark Fashehcf8e06f2007-12-20 16:43:10 -08001977 return;
1978
1979 mlog(0, "Unlock: \"%s\" flags: 0x%lx, level: %d, act: %d\n",
1980 lockres->l_name, lockres->l_flags, lockres->l_level,
1981 lockres->l_action);
1982
1983 spin_lock_irqsave(&lockres->l_lock, flags);
1984 /*
1985 * Fake a blocking ast for the downconvert code.
1986 */
1987 lockres_or_flags(lockres, OCFS2_LOCK_BLOCKED);
Joel Beckerbd3e7612008-02-01 12:14:57 -08001988 lockres->l_blocking = DLM_LOCK_EX;
Mark Fashehcf8e06f2007-12-20 16:43:10 -08001989
Mark Fashehe988cf12008-07-10 09:25:39 -07001990 gen = ocfs2_prepare_downconvert(lockres, DLM_LOCK_NL);
Mark Fashehcf8e06f2007-12-20 16:43:10 -08001991 lockres_add_mask_waiter(lockres, &mw, OCFS2_LOCK_BUSY, 0);
1992 spin_unlock_irqrestore(&lockres->l_lock, flags);
1993
Mark Fashehe988cf12008-07-10 09:25:39 -07001994 ret = ocfs2_downconvert_lock(osb, lockres, DLM_LOCK_NL, 0, gen);
Mark Fashehcf8e06f2007-12-20 16:43:10 -08001995 if (ret) {
1996 mlog_errno(ret);
1997 return;
1998 }
1999
2000 ret = ocfs2_wait_for_mask(&mw);
2001 if (ret)
2002 mlog_errno(ret);
2003}
2004
Mark Fasheh34d024f2007-09-24 15:56:19 -07002005static void ocfs2_downconvert_on_unlock(struct ocfs2_super *osb,
2006 struct ocfs2_lock_res *lockres)
Mark Fashehccd979b2005-12-15 14:31:24 -08002007{
2008 int kick = 0;
2009
Mark Fashehccd979b2005-12-15 14:31:24 -08002010 /* If we know that another node is waiting on our lock, kick
Mark Fasheh34d024f2007-09-24 15:56:19 -07002011 * the downconvert thread * pre-emptively when we reach a release
Mark Fashehccd979b2005-12-15 14:31:24 -08002012 * condition. */
2013 if (lockres->l_flags & OCFS2_LOCK_BLOCKED) {
2014 switch(lockres->l_blocking) {
Joel Beckerbd3e7612008-02-01 12:14:57 -08002015 case DLM_LOCK_EX:
Mark Fashehccd979b2005-12-15 14:31:24 -08002016 if (!lockres->l_ex_holders && !lockres->l_ro_holders)
2017 kick = 1;
2018 break;
Joel Beckerbd3e7612008-02-01 12:14:57 -08002019 case DLM_LOCK_PR:
Mark Fashehccd979b2005-12-15 14:31:24 -08002020 if (!lockres->l_ex_holders)
2021 kick = 1;
2022 break;
2023 default:
2024 BUG();
2025 }
2026 }
2027
2028 if (kick)
Mark Fasheh34d024f2007-09-24 15:56:19 -07002029 ocfs2_wake_downconvert_thread(osb);
Mark Fashehccd979b2005-12-15 14:31:24 -08002030}
2031
Mark Fashehccd979b2005-12-15 14:31:24 -08002032#define OCFS2_SEC_BITS 34
2033#define OCFS2_SEC_SHIFT (64 - 34)
2034#define OCFS2_NSEC_MASK ((1ULL << OCFS2_SEC_SHIFT) - 1)
2035
2036/* LVB only has room for 64 bits of time here so we pack it for
2037 * now. */
2038static u64 ocfs2_pack_timespec(struct timespec *spec)
2039{
2040 u64 res;
2041 u64 sec = spec->tv_sec;
2042 u32 nsec = spec->tv_nsec;
2043
2044 res = (sec << OCFS2_SEC_SHIFT) | (nsec & OCFS2_NSEC_MASK);
2045
2046 return res;
2047}
2048
2049/* Call this with the lockres locked. I am reasonably sure we don't
2050 * need ip_lock in this function as anyone who would be changing those
Mark Fashehe63aecb62007-10-18 15:30:42 -07002051 * values is supposed to be blocked in ocfs2_inode_lock right now. */
Mark Fashehccd979b2005-12-15 14:31:24 -08002052static void __ocfs2_stuff_meta_lvb(struct inode *inode)
2053{
2054 struct ocfs2_inode_info *oi = OCFS2_I(inode);
Mark Fashehe63aecb62007-10-18 15:30:42 -07002055 struct ocfs2_lock_res *lockres = &oi->ip_inode_lockres;
Mark Fashehccd979b2005-12-15 14:31:24 -08002056 struct ocfs2_meta_lvb *lvb;
2057
Mark Fasheha641dc22008-12-24 16:03:48 -08002058 lvb = ocfs2_dlm_lvb(&lockres->l_lksb);
Mark Fashehccd979b2005-12-15 14:31:24 -08002059
Mark Fasheh24c19ef2006-09-22 17:28:19 -07002060 /*
2061 * Invalidate the LVB of a deleted inode - this way other
2062 * nodes are forced to go to disk and discover the new inode
2063 * status.
2064 */
2065 if (oi->ip_flags & OCFS2_INODE_DELETED) {
2066 lvb->lvb_version = 0;
2067 goto out;
2068 }
2069
Mark Fasheh4d3b83f2006-09-12 15:22:18 -07002070 lvb->lvb_version = OCFS2_LVB_VERSION;
Mark Fashehccd979b2005-12-15 14:31:24 -08002071 lvb->lvb_isize = cpu_to_be64(i_size_read(inode));
2072 lvb->lvb_iclusters = cpu_to_be32(oi->ip_clusters);
Eric W. Biederman03ab30f2013-01-31 16:59:23 -08002073 lvb->lvb_iuid = cpu_to_be32(i_uid_read(inode));
2074 lvb->lvb_igid = cpu_to_be32(i_gid_read(inode));
Mark Fashehccd979b2005-12-15 14:31:24 -08002075 lvb->lvb_imode = cpu_to_be16(inode->i_mode);
2076 lvb->lvb_inlink = cpu_to_be16(inode->i_nlink);
2077 lvb->lvb_iatime_packed =
2078 cpu_to_be64(ocfs2_pack_timespec(&inode->i_atime));
2079 lvb->lvb_ictime_packed =
2080 cpu_to_be64(ocfs2_pack_timespec(&inode->i_ctime));
2081 lvb->lvb_imtime_packed =
2082 cpu_to_be64(ocfs2_pack_timespec(&inode->i_mtime));
Herbert Poetzlca4d1472006-07-03 17:27:12 -07002083 lvb->lvb_iattr = cpu_to_be32(oi->ip_attr);
Mark Fasheh15b1e362007-09-07 13:58:15 -07002084 lvb->lvb_idynfeatures = cpu_to_be16(oi->ip_dyn_features);
Mark Fashehf9e2d822006-09-12 15:35:49 -07002085 lvb->lvb_igeneration = cpu_to_be32(inode->i_generation);
Mark Fashehccd979b2005-12-15 14:31:24 -08002086
Mark Fasheh24c19ef2006-09-22 17:28:19 -07002087out:
Mark Fashehccd979b2005-12-15 14:31:24 -08002088 mlog_meta_lvb(0, lockres);
Mark Fashehccd979b2005-12-15 14:31:24 -08002089}
2090
2091static void ocfs2_unpack_timespec(struct timespec *spec,
2092 u64 packed_time)
2093{
2094 spec->tv_sec = packed_time >> OCFS2_SEC_SHIFT;
2095 spec->tv_nsec = packed_time & OCFS2_NSEC_MASK;
2096}
2097
2098static void ocfs2_refresh_inode_from_lvb(struct inode *inode)
2099{
2100 struct ocfs2_inode_info *oi = OCFS2_I(inode);
Mark Fashehe63aecb62007-10-18 15:30:42 -07002101 struct ocfs2_lock_res *lockres = &oi->ip_inode_lockres;
Mark Fashehccd979b2005-12-15 14:31:24 -08002102 struct ocfs2_meta_lvb *lvb;
2103
Mark Fashehccd979b2005-12-15 14:31:24 -08002104 mlog_meta_lvb(0, lockres);
2105
Mark Fasheha641dc22008-12-24 16:03:48 -08002106 lvb = ocfs2_dlm_lvb(&lockres->l_lksb);
Mark Fashehccd979b2005-12-15 14:31:24 -08002107
2108 /* We're safe here without the lockres lock... */
2109 spin_lock(&oi->ip_lock);
2110 oi->ip_clusters = be32_to_cpu(lvb->lvb_iclusters);
2111 i_size_write(inode, be64_to_cpu(lvb->lvb_isize));
2112
Herbert Poetzlca4d1472006-07-03 17:27:12 -07002113 oi->ip_attr = be32_to_cpu(lvb->lvb_iattr);
Mark Fasheh15b1e362007-09-07 13:58:15 -07002114 oi->ip_dyn_features = be16_to_cpu(lvb->lvb_idynfeatures);
Herbert Poetzlca4d1472006-07-03 17:27:12 -07002115 ocfs2_set_inode_flags(inode);
2116
Mark Fashehccd979b2005-12-15 14:31:24 -08002117 /* fast-symlinks are a special case */
2118 if (S_ISLNK(inode->i_mode) && !oi->ip_clusters)
2119 inode->i_blocks = 0;
2120 else
Mark Fasheh8110b072007-03-22 16:53:23 -07002121 inode->i_blocks = ocfs2_inode_sector_count(inode);
Mark Fashehccd979b2005-12-15 14:31:24 -08002122
Eric W. Biederman03ab30f2013-01-31 16:59:23 -08002123 i_uid_write(inode, be32_to_cpu(lvb->lvb_iuid));
2124 i_gid_write(inode, be32_to_cpu(lvb->lvb_igid));
Mark Fashehccd979b2005-12-15 14:31:24 -08002125 inode->i_mode = be16_to_cpu(lvb->lvb_imode);
Miklos Szeredibfe86842011-10-28 14:13:29 +02002126 set_nlink(inode, be16_to_cpu(lvb->lvb_inlink));
Mark Fashehccd979b2005-12-15 14:31:24 -08002127 ocfs2_unpack_timespec(&inode->i_atime,
2128 be64_to_cpu(lvb->lvb_iatime_packed));
2129 ocfs2_unpack_timespec(&inode->i_mtime,
2130 be64_to_cpu(lvb->lvb_imtime_packed));
2131 ocfs2_unpack_timespec(&inode->i_ctime,
2132 be64_to_cpu(lvb->lvb_ictime_packed));
2133 spin_unlock(&oi->ip_lock);
Mark Fashehccd979b2005-12-15 14:31:24 -08002134}
2135
Mark Fashehf9e2d822006-09-12 15:35:49 -07002136static inline int ocfs2_meta_lvb_is_trustable(struct inode *inode,
2137 struct ocfs2_lock_res *lockres)
Mark Fashehccd979b2005-12-15 14:31:24 -08002138{
Mark Fasheha641dc22008-12-24 16:03:48 -08002139 struct ocfs2_meta_lvb *lvb = ocfs2_dlm_lvb(&lockres->l_lksb);
Mark Fashehccd979b2005-12-15 14:31:24 -08002140
Joel Becker1c520df2009-06-19 15:14:13 -07002141 if (ocfs2_dlm_lvb_valid(&lockres->l_lksb)
2142 && lvb->lvb_version == OCFS2_LVB_VERSION
Mark Fashehf9e2d822006-09-12 15:35:49 -07002143 && be32_to_cpu(lvb->lvb_igeneration) == inode->i_generation)
Mark Fashehccd979b2005-12-15 14:31:24 -08002144 return 1;
2145 return 0;
2146}
2147
2148/* Determine whether a lock resource needs to be refreshed, and
2149 * arbitrate who gets to refresh it.
2150 *
2151 * 0 means no refresh needed.
2152 *
2153 * > 0 means you need to refresh this and you MUST call
2154 * ocfs2_complete_lock_res_refresh afterwards. */
2155static int ocfs2_should_refresh_lock_res(struct ocfs2_lock_res *lockres)
2156{
2157 unsigned long flags;
2158 int status = 0;
2159
Mark Fashehccd979b2005-12-15 14:31:24 -08002160refresh_check:
2161 spin_lock_irqsave(&lockres->l_lock, flags);
2162 if (!(lockres->l_flags & OCFS2_LOCK_NEEDS_REFRESH)) {
2163 spin_unlock_irqrestore(&lockres->l_lock, flags);
2164 goto bail;
2165 }
2166
2167 if (lockres->l_flags & OCFS2_LOCK_REFRESHING) {
2168 spin_unlock_irqrestore(&lockres->l_lock, flags);
2169
2170 ocfs2_wait_on_refreshing_lock(lockres);
2171 goto refresh_check;
2172 }
2173
2174 /* Ok, I'll be the one to refresh this lock. */
2175 lockres_or_flags(lockres, OCFS2_LOCK_REFRESHING);
2176 spin_unlock_irqrestore(&lockres->l_lock, flags);
2177
2178 status = 1;
2179bail:
Tao Mac1e8d352011-03-07 16:43:21 +08002180 mlog(0, "status %d\n", status);
Mark Fashehccd979b2005-12-15 14:31:24 -08002181 return status;
2182}
2183
2184/* If status is non zero, I'll mark it as not being in refresh
2185 * anymroe, but i won't clear the needs refresh flag. */
2186static inline void ocfs2_complete_lock_res_refresh(struct ocfs2_lock_res *lockres,
2187 int status)
2188{
2189 unsigned long flags;
Mark Fashehccd979b2005-12-15 14:31:24 -08002190
2191 spin_lock_irqsave(&lockres->l_lock, flags);
2192 lockres_clear_flags(lockres, OCFS2_LOCK_REFRESHING);
2193 if (!status)
2194 lockres_clear_flags(lockres, OCFS2_LOCK_NEEDS_REFRESH);
2195 spin_unlock_irqrestore(&lockres->l_lock, flags);
2196
2197 wake_up(&lockres->l_event);
Mark Fashehccd979b2005-12-15 14:31:24 -08002198}
2199
2200/* may or may not return a bh if it went to disk. */
Mark Fashehe63aecb62007-10-18 15:30:42 -07002201static int ocfs2_inode_lock_update(struct inode *inode,
Mark Fashehccd979b2005-12-15 14:31:24 -08002202 struct buffer_head **bh)
2203{
2204 int status = 0;
2205 struct ocfs2_inode_info *oi = OCFS2_I(inode);
Mark Fashehe63aecb62007-10-18 15:30:42 -07002206 struct ocfs2_lock_res *lockres = &oi->ip_inode_lockres;
Mark Fashehccd979b2005-12-15 14:31:24 -08002207 struct ocfs2_dinode *fe;
Sunil Mushranc271c5c2006-12-05 17:56:35 -08002208 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
Mark Fashehccd979b2005-12-15 14:31:24 -08002209
Mark Fashehbe9e9862007-04-18 15:22:08 -07002210 if (ocfs2_mount_local(osb))
2211 goto bail;
2212
Mark Fashehccd979b2005-12-15 14:31:24 -08002213 spin_lock(&oi->ip_lock);
2214 if (oi->ip_flags & OCFS2_INODE_DELETED) {
Mark Fashehb06970532006-03-03 10:24:33 -08002215 mlog(0, "Orphaned inode %llu was deleted while we "
Mark Fashehccd979b2005-12-15 14:31:24 -08002216 "were waiting on a lock. ip_flags = 0x%x\n",
Mark Fashehb06970532006-03-03 10:24:33 -08002217 (unsigned long long)oi->ip_blkno, oi->ip_flags);
Mark Fashehccd979b2005-12-15 14:31:24 -08002218 spin_unlock(&oi->ip_lock);
2219 status = -ENOENT;
2220 goto bail;
2221 }
2222 spin_unlock(&oi->ip_lock);
2223
Mark Fashehbe9e9862007-04-18 15:22:08 -07002224 if (!ocfs2_should_refresh_lock_res(lockres))
2225 goto bail;
Mark Fashehccd979b2005-12-15 14:31:24 -08002226
2227 /* This will discard any caching information we might have had
2228 * for the inode metadata. */
Joel Becker8cb471e2009-02-10 20:00:41 -08002229 ocfs2_metadata_cache_purge(INODE_CACHE(inode));
Mark Fashehccd979b2005-12-15 14:31:24 -08002230
Mark Fasheh83418972007-04-23 18:53:12 -07002231 ocfs2_extent_map_trunc(inode, 0);
2232
Mark Fashehbe9e9862007-04-18 15:22:08 -07002233 if (ocfs2_meta_lvb_is_trustable(inode, lockres)) {
Mark Fashehb06970532006-03-03 10:24:33 -08002234 mlog(0, "Trusting LVB on inode %llu\n",
2235 (unsigned long long)oi->ip_blkno);
Mark Fashehccd979b2005-12-15 14:31:24 -08002236 ocfs2_refresh_inode_from_lvb(inode);
2237 } else {
2238 /* Boo, we have to go to disk. */
2239 /* read bh, cast, ocfs2_refresh_inode */
Joel Beckerb657c952008-11-13 14:49:11 -08002240 status = ocfs2_read_inode_block(inode, bh);
Mark Fashehccd979b2005-12-15 14:31:24 -08002241 if (status < 0) {
2242 mlog_errno(status);
2243 goto bail_refresh;
2244 }
2245 fe = (struct ocfs2_dinode *) (*bh)->b_data;
2246
2247 /* This is a good chance to make sure we're not
Joel Beckerb657c952008-11-13 14:49:11 -08002248 * locking an invalid object. ocfs2_read_inode_block()
2249 * already checked that the inode block is sane.
Mark Fashehccd979b2005-12-15 14:31:24 -08002250 *
2251 * We bug on a stale inode here because we checked
2252 * above whether it was wiped from disk. The wiping
2253 * node provides a guarantee that we receive that
2254 * message and can mark the inode before dropping any
2255 * locks associated with it. */
Mark Fashehccd979b2005-12-15 14:31:24 -08002256 mlog_bug_on_msg(inode->i_generation !=
2257 le32_to_cpu(fe->i_generation),
Mark Fashehb06970532006-03-03 10:24:33 -08002258 "Invalid dinode %llu disk generation: %u "
Mark Fashehccd979b2005-12-15 14:31:24 -08002259 "inode->i_generation: %u\n",
Mark Fashehb06970532006-03-03 10:24:33 -08002260 (unsigned long long)oi->ip_blkno,
2261 le32_to_cpu(fe->i_generation),
Mark Fashehccd979b2005-12-15 14:31:24 -08002262 inode->i_generation);
2263 mlog_bug_on_msg(le64_to_cpu(fe->i_dtime) ||
2264 !(fe->i_flags & cpu_to_le32(OCFS2_VALID_FL)),
Mark Fashehb06970532006-03-03 10:24:33 -08002265 "Stale dinode %llu dtime: %llu flags: 0x%x\n",
2266 (unsigned long long)oi->ip_blkno,
2267 (unsigned long long)le64_to_cpu(fe->i_dtime),
Mark Fashehccd979b2005-12-15 14:31:24 -08002268 le32_to_cpu(fe->i_flags));
2269
2270 ocfs2_refresh_inode(inode, fe);
Sunil Mushran8ddb7b02008-05-13 13:45:15 -07002271 ocfs2_track_lock_refresh(lockres);
Mark Fashehccd979b2005-12-15 14:31:24 -08002272 }
2273
2274 status = 0;
2275bail_refresh:
Mark Fashehbe9e9862007-04-18 15:22:08 -07002276 ocfs2_complete_lock_res_refresh(lockres, status);
Mark Fashehccd979b2005-12-15 14:31:24 -08002277bail:
Mark Fashehccd979b2005-12-15 14:31:24 -08002278 return status;
2279}
2280
2281static int ocfs2_assign_bh(struct inode *inode,
2282 struct buffer_head **ret_bh,
2283 struct buffer_head *passed_bh)
2284{
2285 int status;
2286
2287 if (passed_bh) {
2288 /* Ok, the update went to disk for us, use the
2289 * returned bh. */
2290 *ret_bh = passed_bh;
2291 get_bh(*ret_bh);
2292
2293 return 0;
2294 }
2295
Joel Beckerb657c952008-11-13 14:49:11 -08002296 status = ocfs2_read_inode_block(inode, ret_bh);
Mark Fashehccd979b2005-12-15 14:31:24 -08002297 if (status < 0)
2298 mlog_errno(status);
2299
2300 return status;
2301}
2302
2303/*
2304 * returns < 0 error if the callback will never be called, otherwise
2305 * the result of the lock will be communicated via the callback.
2306 */
Jan Karacb257972009-06-04 15:26:50 +02002307int ocfs2_inode_lock_full_nested(struct inode *inode,
2308 struct buffer_head **ret_bh,
2309 int ex,
2310 int arg_flags,
2311 int subclass)
Mark Fashehccd979b2005-12-15 14:31:24 -08002312{
Joel Beckerbd3e7612008-02-01 12:14:57 -08002313 int status, level, acquired;
2314 u32 dlm_flags;
Sunil Mushranc271c5c2006-12-05 17:56:35 -08002315 struct ocfs2_lock_res *lockres = NULL;
Mark Fashehccd979b2005-12-15 14:31:24 -08002316 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2317 struct buffer_head *local_bh = NULL;
2318
2319 BUG_ON(!inode);
2320
Mark Fashehb06970532006-03-03 10:24:33 -08002321 mlog(0, "inode %llu, take %s META lock\n",
2322 (unsigned long long)OCFS2_I(inode)->ip_blkno,
Mark Fashehccd979b2005-12-15 14:31:24 -08002323 ex ? "EXMODE" : "PRMODE");
2324
2325 status = 0;
2326 acquired = 0;
2327 /* We'll allow faking a readonly metadata lock for
2328 * rodevices. */
2329 if (ocfs2_is_hard_readonly(osb)) {
2330 if (ex)
2331 status = -EROFS;
Tiger Yang03efed82011-05-28 00:34:19 +08002332 goto getbh;
Mark Fashehccd979b2005-12-15 14:31:24 -08002333 }
2334
Sunil Mushranc271c5c2006-12-05 17:56:35 -08002335 if (ocfs2_mount_local(osb))
2336 goto local;
2337
Mark Fashehccd979b2005-12-15 14:31:24 -08002338 if (!(arg_flags & OCFS2_META_LOCK_RECOVERY))
Joel Becker553abd02008-02-01 12:03:57 -08002339 ocfs2_wait_for_recovery(osb);
Mark Fashehccd979b2005-12-15 14:31:24 -08002340
Mark Fashehe63aecb62007-10-18 15:30:42 -07002341 lockres = &OCFS2_I(inode)->ip_inode_lockres;
Joel Beckerbd3e7612008-02-01 12:14:57 -08002342 level = ex ? DLM_LOCK_EX : DLM_LOCK_PR;
Mark Fashehccd979b2005-12-15 14:31:24 -08002343 dlm_flags = 0;
2344 if (arg_flags & OCFS2_META_LOCK_NOQUEUE)
Joel Beckerbd3e7612008-02-01 12:14:57 -08002345 dlm_flags |= DLM_LKF_NOQUEUE;
Mark Fashehccd979b2005-12-15 14:31:24 -08002346
Jan Karacb257972009-06-04 15:26:50 +02002347 status = __ocfs2_cluster_lock(osb, lockres, level, dlm_flags,
2348 arg_flags, subclass, _RET_IP_);
Mark Fashehccd979b2005-12-15 14:31:24 -08002349 if (status < 0) {
Zach Brown41003a72013-05-07 16:18:25 -07002350 if (status != -EAGAIN)
Mark Fashehccd979b2005-12-15 14:31:24 -08002351 mlog_errno(status);
2352 goto bail;
2353 }
2354
2355 /* Notify the error cleanup path to drop the cluster lock. */
2356 acquired = 1;
2357
2358 /* We wait twice because a node may have died while we were in
2359 * the lower dlm layers. The second time though, we've
2360 * committed to owning this lock so we don't allow signals to
2361 * abort the operation. */
2362 if (!(arg_flags & OCFS2_META_LOCK_RECOVERY))
Joel Becker553abd02008-02-01 12:03:57 -08002363 ocfs2_wait_for_recovery(osb);
Mark Fashehccd979b2005-12-15 14:31:24 -08002364
Sunil Mushranc271c5c2006-12-05 17:56:35 -08002365local:
Mark Fasheh24c19ef2006-09-22 17:28:19 -07002366 /*
2367 * We only see this flag if we're being called from
2368 * ocfs2_read_locked_inode(). It means we're locking an inode
2369 * which hasn't been populated yet, so clear the refresh flag
2370 * and let the caller handle it.
2371 */
2372 if (inode->i_state & I_NEW) {
2373 status = 0;
Sunil Mushranc271c5c2006-12-05 17:56:35 -08002374 if (lockres)
2375 ocfs2_complete_lock_res_refresh(lockres, 0);
Mark Fasheh24c19ef2006-09-22 17:28:19 -07002376 goto bail;
2377 }
2378
Mark Fashehccd979b2005-12-15 14:31:24 -08002379 /* This is fun. The caller may want a bh back, or it may
Mark Fashehe63aecb62007-10-18 15:30:42 -07002380 * not. ocfs2_inode_lock_update definitely wants one in, but
Mark Fashehccd979b2005-12-15 14:31:24 -08002381 * may or may not read one, depending on what's in the
2382 * LVB. The result of all of this is that we've *only* gone to
2383 * disk if we have to, so the complexity is worthwhile. */
Mark Fashehe63aecb62007-10-18 15:30:42 -07002384 status = ocfs2_inode_lock_update(inode, &local_bh);
Mark Fashehccd979b2005-12-15 14:31:24 -08002385 if (status < 0) {
2386 if (status != -ENOENT)
2387 mlog_errno(status);
2388 goto bail;
2389 }
Tiger Yang03efed82011-05-28 00:34:19 +08002390getbh:
Mark Fashehccd979b2005-12-15 14:31:24 -08002391 if (ret_bh) {
2392 status = ocfs2_assign_bh(inode, ret_bh, local_bh);
2393 if (status < 0) {
2394 mlog_errno(status);
2395 goto bail;
2396 }
2397 }
2398
Mark Fashehccd979b2005-12-15 14:31:24 -08002399bail:
2400 if (status < 0) {
2401 if (ret_bh && (*ret_bh)) {
2402 brelse(*ret_bh);
2403 *ret_bh = NULL;
2404 }
2405 if (acquired)
Mark Fashehe63aecb62007-10-18 15:30:42 -07002406 ocfs2_inode_unlock(inode, ex);
Mark Fashehccd979b2005-12-15 14:31:24 -08002407 }
2408
2409 if (local_bh)
2410 brelse(local_bh);
2411
Mark Fashehccd979b2005-12-15 14:31:24 -08002412 return status;
2413}
2414
2415/*
Mark Fasheh34d024f2007-09-24 15:56:19 -07002416 * This is working around a lock inversion between tasks acquiring DLM
2417 * locks while holding a page lock and the downconvert thread which
2418 * blocks dlm lock acquiry while acquiring page locks.
Mark Fashehccd979b2005-12-15 14:31:24 -08002419 *
2420 * ** These _with_page variantes are only intended to be called from aop
2421 * methods that hold page locks and return a very specific *positive* error
2422 * code that aop methods pass up to the VFS -- test for errors with != 0. **
2423 *
Mark Fasheh34d024f2007-09-24 15:56:19 -07002424 * The DLM is called such that it returns -EAGAIN if it would have
2425 * blocked waiting for the downconvert thread. In that case we unlock
2426 * our page so the downconvert thread can make progress. Once we've
2427 * done this we have to return AOP_TRUNCATED_PAGE so the aop method
2428 * that called us can bubble that back up into the VFS who will then
2429 * immediately retry the aop call.
Mark Fashehccd979b2005-12-15 14:31:24 -08002430 *
2431 * We do a blocking lock and immediate unlock before returning, though, so that
2432 * the lock has a great chance of being cached on this node by the time the VFS
2433 * calls back to retry the aop. This has a potential to livelock as nodes
2434 * ping locks back and forth, but that's a risk we're willing to take to avoid
2435 * the lock inversion simply.
2436 */
Mark Fashehe63aecb62007-10-18 15:30:42 -07002437int ocfs2_inode_lock_with_page(struct inode *inode,
Mark Fashehccd979b2005-12-15 14:31:24 -08002438 struct buffer_head **ret_bh,
2439 int ex,
2440 struct page *page)
2441{
2442 int ret;
2443
Mark Fashehe63aecb62007-10-18 15:30:42 -07002444 ret = ocfs2_inode_lock_full(inode, ret_bh, ex, OCFS2_LOCK_NONBLOCK);
Mark Fashehccd979b2005-12-15 14:31:24 -08002445 if (ret == -EAGAIN) {
2446 unlock_page(page);
Mark Fashehe63aecb62007-10-18 15:30:42 -07002447 if (ocfs2_inode_lock(inode, ret_bh, ex) == 0)
2448 ocfs2_inode_unlock(inode, ex);
Mark Fashehccd979b2005-12-15 14:31:24 -08002449 ret = AOP_TRUNCATED_PAGE;
2450 }
2451
2452 return ret;
2453}
2454
Mark Fashehe63aecb62007-10-18 15:30:42 -07002455int ocfs2_inode_lock_atime(struct inode *inode,
Tiger Yang7f1a37e2006-11-15 15:48:42 +08002456 struct vfsmount *vfsmnt,
2457 int *level)
2458{
2459 int ret;
2460
Mark Fashehe63aecb62007-10-18 15:30:42 -07002461 ret = ocfs2_inode_lock(inode, NULL, 0);
Tiger Yang7f1a37e2006-11-15 15:48:42 +08002462 if (ret < 0) {
2463 mlog_errno(ret);
2464 return ret;
2465 }
2466
2467 /*
2468 * If we should update atime, we will get EX lock,
2469 * otherwise we just get PR lock.
2470 */
2471 if (ocfs2_should_update_atime(inode, vfsmnt)) {
2472 struct buffer_head *bh = NULL;
2473
Mark Fashehe63aecb62007-10-18 15:30:42 -07002474 ocfs2_inode_unlock(inode, 0);
2475 ret = ocfs2_inode_lock(inode, &bh, 1);
Tiger Yang7f1a37e2006-11-15 15:48:42 +08002476 if (ret < 0) {
2477 mlog_errno(ret);
2478 return ret;
2479 }
2480 *level = 1;
2481 if (ocfs2_should_update_atime(inode, vfsmnt))
2482 ocfs2_update_inode_atime(inode, bh);
2483 if (bh)
2484 brelse(bh);
2485 } else
2486 *level = 0;
2487
Tiger Yang7f1a37e2006-11-15 15:48:42 +08002488 return ret;
2489}
2490
Mark Fashehe63aecb62007-10-18 15:30:42 -07002491void ocfs2_inode_unlock(struct inode *inode,
Mark Fashehccd979b2005-12-15 14:31:24 -08002492 int ex)
2493{
Joel Beckerbd3e7612008-02-01 12:14:57 -08002494 int level = ex ? DLM_LOCK_EX : DLM_LOCK_PR;
Mark Fashehe63aecb62007-10-18 15:30:42 -07002495 struct ocfs2_lock_res *lockres = &OCFS2_I(inode)->ip_inode_lockres;
Sunil Mushranc271c5c2006-12-05 17:56:35 -08002496 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
Mark Fashehccd979b2005-12-15 14:31:24 -08002497
Mark Fashehb06970532006-03-03 10:24:33 -08002498 mlog(0, "inode %llu drop %s META lock\n",
2499 (unsigned long long)OCFS2_I(inode)->ip_blkno,
Mark Fashehccd979b2005-12-15 14:31:24 -08002500 ex ? "EXMODE" : "PRMODE");
2501
Sunil Mushranc271c5c2006-12-05 17:56:35 -08002502 if (!ocfs2_is_hard_readonly(OCFS2_SB(inode->i_sb)) &&
2503 !ocfs2_mount_local(osb))
Mark Fashehccd979b2005-12-15 14:31:24 -08002504 ocfs2_cluster_unlock(OCFS2_SB(inode->i_sb), lockres, level);
Mark Fashehccd979b2005-12-15 14:31:24 -08002505}
2506
Sunil Mushrandf152c22009-06-22 11:40:07 -07002507int ocfs2_orphan_scan_lock(struct ocfs2_super *osb, u32 *seqno)
Srinivas Eeda83273932009-06-03 17:02:55 -07002508{
2509 struct ocfs2_lock_res *lockres;
2510 struct ocfs2_orphan_scan_lvb *lvb;
Srinivas Eeda83273932009-06-03 17:02:55 -07002511 int status = 0;
2512
Sunil Mushrandf152c22009-06-22 11:40:07 -07002513 if (ocfs2_is_hard_readonly(osb))
2514 return -EROFS;
2515
2516 if (ocfs2_mount_local(osb))
2517 return 0;
2518
Srinivas Eeda83273932009-06-03 17:02:55 -07002519 lockres = &osb->osb_orphan_scan.os_lockres;
Sunil Mushrandf152c22009-06-22 11:40:07 -07002520 status = ocfs2_cluster_lock(osb, lockres, DLM_LOCK_EX, 0, 0);
Srinivas Eeda83273932009-06-03 17:02:55 -07002521 if (status < 0)
2522 return status;
2523
2524 lvb = ocfs2_dlm_lvb(&lockres->l_lksb);
Joel Becker1c520df2009-06-19 15:14:13 -07002525 if (ocfs2_dlm_lvb_valid(&lockres->l_lksb) &&
2526 lvb->lvb_version == OCFS2_ORPHAN_LVB_VERSION)
Srinivas Eeda83273932009-06-03 17:02:55 -07002527 *seqno = be32_to_cpu(lvb->lvb_os_seqno);
Sunil Mushran32119492009-06-19 16:53:18 -07002528 else
2529 *seqno = osb->osb_orphan_scan.os_seqno + 1;
2530
Srinivas Eeda83273932009-06-03 17:02:55 -07002531 return status;
2532}
2533
Sunil Mushrandf152c22009-06-22 11:40:07 -07002534void ocfs2_orphan_scan_unlock(struct ocfs2_super *osb, u32 seqno)
Srinivas Eeda83273932009-06-03 17:02:55 -07002535{
2536 struct ocfs2_lock_res *lockres;
2537 struct ocfs2_orphan_scan_lvb *lvb;
Srinivas Eeda83273932009-06-03 17:02:55 -07002538
Sunil Mushrandf152c22009-06-22 11:40:07 -07002539 if (!ocfs2_is_hard_readonly(osb) && !ocfs2_mount_local(osb)) {
2540 lockres = &osb->osb_orphan_scan.os_lockres;
2541 lvb = ocfs2_dlm_lvb(&lockres->l_lksb);
2542 lvb->lvb_version = OCFS2_ORPHAN_LVB_VERSION;
2543 lvb->lvb_os_seqno = cpu_to_be32(seqno);
2544 ocfs2_cluster_unlock(osb, lockres, DLM_LOCK_EX);
2545 }
Srinivas Eeda83273932009-06-03 17:02:55 -07002546}
2547
Mark Fashehccd979b2005-12-15 14:31:24 -08002548int ocfs2_super_lock(struct ocfs2_super *osb,
2549 int ex)
2550{
Sunil Mushranc271c5c2006-12-05 17:56:35 -08002551 int status = 0;
Joel Beckerbd3e7612008-02-01 12:14:57 -08002552 int level = ex ? DLM_LOCK_EX : DLM_LOCK_PR;
Mark Fashehccd979b2005-12-15 14:31:24 -08002553 struct ocfs2_lock_res *lockres = &osb->osb_super_lockres;
Mark Fashehccd979b2005-12-15 14:31:24 -08002554
Mark Fashehccd979b2005-12-15 14:31:24 -08002555 if (ocfs2_is_hard_readonly(osb))
2556 return -EROFS;
2557
Sunil Mushranc271c5c2006-12-05 17:56:35 -08002558 if (ocfs2_mount_local(osb))
2559 goto bail;
2560
Mark Fashehccd979b2005-12-15 14:31:24 -08002561 status = ocfs2_cluster_lock(osb, lockres, level, 0, 0);
2562 if (status < 0) {
2563 mlog_errno(status);
2564 goto bail;
2565 }
2566
2567 /* The super block lock path is really in the best position to
2568 * know when resources covered by the lock need to be
2569 * refreshed, so we do it here. Of course, making sense of
2570 * everything is up to the caller :) */
2571 status = ocfs2_should_refresh_lock_res(lockres);
Mark Fashehccd979b2005-12-15 14:31:24 -08002572 if (status) {
Mark Fasheh8e8a4602008-02-01 11:59:09 -08002573 status = ocfs2_refresh_slot_info(osb);
Mark Fashehccd979b2005-12-15 14:31:24 -08002574
2575 ocfs2_complete_lock_res_refresh(lockres, status);
2576
Junxiao Bi3278bb72013-02-21 16:42:45 -08002577 if (status < 0) {
2578 ocfs2_cluster_unlock(osb, lockres, level);
Mark Fashehccd979b2005-12-15 14:31:24 -08002579 mlog_errno(status);
Junxiao Bi3278bb72013-02-21 16:42:45 -08002580 }
Sunil Mushran8ddb7b02008-05-13 13:45:15 -07002581 ocfs2_track_lock_refresh(lockres);
Mark Fashehccd979b2005-12-15 14:31:24 -08002582 }
2583bail:
Mark Fashehccd979b2005-12-15 14:31:24 -08002584 return status;
2585}
2586
2587void ocfs2_super_unlock(struct ocfs2_super *osb,
2588 int ex)
2589{
Joel Beckerbd3e7612008-02-01 12:14:57 -08002590 int level = ex ? DLM_LOCK_EX : DLM_LOCK_PR;
Mark Fashehccd979b2005-12-15 14:31:24 -08002591 struct ocfs2_lock_res *lockres = &osb->osb_super_lockres;
2592
Sunil Mushranc271c5c2006-12-05 17:56:35 -08002593 if (!ocfs2_mount_local(osb))
2594 ocfs2_cluster_unlock(osb, lockres, level);
Mark Fashehccd979b2005-12-15 14:31:24 -08002595}
2596
2597int ocfs2_rename_lock(struct ocfs2_super *osb)
2598{
2599 int status;
2600 struct ocfs2_lock_res *lockres = &osb->osb_rename_lockres;
2601
2602 if (ocfs2_is_hard_readonly(osb))
2603 return -EROFS;
2604
Sunil Mushranc271c5c2006-12-05 17:56:35 -08002605 if (ocfs2_mount_local(osb))
2606 return 0;
2607
Joel Beckerbd3e7612008-02-01 12:14:57 -08002608 status = ocfs2_cluster_lock(osb, lockres, DLM_LOCK_EX, 0, 0);
Mark Fashehccd979b2005-12-15 14:31:24 -08002609 if (status < 0)
2610 mlog_errno(status);
2611
2612 return status;
2613}
2614
2615void ocfs2_rename_unlock(struct ocfs2_super *osb)
2616{
2617 struct ocfs2_lock_res *lockres = &osb->osb_rename_lockres;
2618
Sunil Mushranc271c5c2006-12-05 17:56:35 -08002619 if (!ocfs2_mount_local(osb))
Joel Beckerbd3e7612008-02-01 12:14:57 -08002620 ocfs2_cluster_unlock(osb, lockres, DLM_LOCK_EX);
Mark Fashehccd979b2005-12-15 14:31:24 -08002621}
2622
wengang wang6ca497a2009-03-06 21:29:10 +08002623int ocfs2_nfs_sync_lock(struct ocfs2_super *osb, int ex)
2624{
2625 int status;
2626 struct ocfs2_lock_res *lockres = &osb->osb_nfs_sync_lockres;
2627
2628 if (ocfs2_is_hard_readonly(osb))
2629 return -EROFS;
2630
2631 if (ocfs2_mount_local(osb))
2632 return 0;
2633
2634 status = ocfs2_cluster_lock(osb, lockres, ex ? LKM_EXMODE : LKM_PRMODE,
2635 0, 0);
2636 if (status < 0)
2637 mlog(ML_ERROR, "lock on nfs sync lock failed %d\n", status);
2638
2639 return status;
2640}
2641
2642void ocfs2_nfs_sync_unlock(struct ocfs2_super *osb, int ex)
2643{
2644 struct ocfs2_lock_res *lockres = &osb->osb_nfs_sync_lockres;
2645
2646 if (!ocfs2_mount_local(osb))
2647 ocfs2_cluster_unlock(osb, lockres,
2648 ex ? LKM_EXMODE : LKM_PRMODE);
2649}
2650
Mark Fashehd680efe2006-09-08 14:14:34 -07002651int ocfs2_dentry_lock(struct dentry *dentry, int ex)
2652{
2653 int ret;
Joel Beckerbd3e7612008-02-01 12:14:57 -08002654 int level = ex ? DLM_LOCK_EX : DLM_LOCK_PR;
Mark Fashehd680efe2006-09-08 14:14:34 -07002655 struct ocfs2_dentry_lock *dl = dentry->d_fsdata;
2656 struct ocfs2_super *osb = OCFS2_SB(dentry->d_sb);
2657
2658 BUG_ON(!dl);
2659
Tiger Yang03efed82011-05-28 00:34:19 +08002660 if (ocfs2_is_hard_readonly(osb)) {
2661 if (ex)
2662 return -EROFS;
2663 return 0;
2664 }
Mark Fashehd680efe2006-09-08 14:14:34 -07002665
Sunil Mushranc271c5c2006-12-05 17:56:35 -08002666 if (ocfs2_mount_local(osb))
2667 return 0;
2668
Mark Fashehd680efe2006-09-08 14:14:34 -07002669 ret = ocfs2_cluster_lock(osb, &dl->dl_lockres, level, 0, 0);
2670 if (ret < 0)
2671 mlog_errno(ret);
2672
2673 return ret;
2674}
2675
2676void ocfs2_dentry_unlock(struct dentry *dentry, int ex)
2677{
Joel Beckerbd3e7612008-02-01 12:14:57 -08002678 int level = ex ? DLM_LOCK_EX : DLM_LOCK_PR;
Mark Fashehd680efe2006-09-08 14:14:34 -07002679 struct ocfs2_dentry_lock *dl = dentry->d_fsdata;
2680 struct ocfs2_super *osb = OCFS2_SB(dentry->d_sb);
2681
Tiger Yang03efed82011-05-28 00:34:19 +08002682 if (!ocfs2_is_hard_readonly(osb) && !ocfs2_mount_local(osb))
Sunil Mushranc271c5c2006-12-05 17:56:35 -08002683 ocfs2_cluster_unlock(osb, &dl->dl_lockres, level);
Mark Fashehd680efe2006-09-08 14:14:34 -07002684}
2685
Mark Fashehccd979b2005-12-15 14:31:24 -08002686/* Reference counting of the dlm debug structure. We want this because
2687 * open references on the debug inodes can live on after a mount, so
2688 * we can't rely on the ocfs2_super to always exist. */
2689static void ocfs2_dlm_debug_free(struct kref *kref)
2690{
2691 struct ocfs2_dlm_debug *dlm_debug;
2692
2693 dlm_debug = container_of(kref, struct ocfs2_dlm_debug, d_refcnt);
2694
2695 kfree(dlm_debug);
2696}
2697
2698void ocfs2_put_dlm_debug(struct ocfs2_dlm_debug *dlm_debug)
2699{
2700 if (dlm_debug)
2701 kref_put(&dlm_debug->d_refcnt, ocfs2_dlm_debug_free);
2702}
2703
2704static void ocfs2_get_dlm_debug(struct ocfs2_dlm_debug *debug)
2705{
2706 kref_get(&debug->d_refcnt);
2707}
2708
2709struct ocfs2_dlm_debug *ocfs2_new_dlm_debug(void)
2710{
2711 struct ocfs2_dlm_debug *dlm_debug;
2712
2713 dlm_debug = kmalloc(sizeof(struct ocfs2_dlm_debug), GFP_KERNEL);
2714 if (!dlm_debug) {
2715 mlog_errno(-ENOMEM);
2716 goto out;
2717 }
2718
2719 kref_init(&dlm_debug->d_refcnt);
2720 INIT_LIST_HEAD(&dlm_debug->d_lockres_tracking);
2721 dlm_debug->d_locking_state = NULL;
2722out:
2723 return dlm_debug;
2724}
2725
2726/* Access to this is arbitrated for us via seq_file->sem. */
2727struct ocfs2_dlm_seq_priv {
2728 struct ocfs2_dlm_debug *p_dlm_debug;
2729 struct ocfs2_lock_res p_iter_res;
2730 struct ocfs2_lock_res p_tmp_res;
2731};
2732
2733static struct ocfs2_lock_res *ocfs2_dlm_next_res(struct ocfs2_lock_res *start,
2734 struct ocfs2_dlm_seq_priv *priv)
2735{
2736 struct ocfs2_lock_res *iter, *ret = NULL;
2737 struct ocfs2_dlm_debug *dlm_debug = priv->p_dlm_debug;
2738
2739 assert_spin_locked(&ocfs2_dlm_tracking_lock);
2740
2741 list_for_each_entry(iter, &start->l_debug_list, l_debug_list) {
2742 /* discover the head of the list */
2743 if (&iter->l_debug_list == &dlm_debug->d_lockres_tracking) {
2744 mlog(0, "End of list found, %p\n", ret);
2745 break;
2746 }
2747
2748 /* We track our "dummy" iteration lockres' by a NULL
2749 * l_ops field. */
2750 if (iter->l_ops != NULL) {
2751 ret = iter;
2752 break;
2753 }
2754 }
2755
2756 return ret;
2757}
2758
2759static void *ocfs2_dlm_seq_start(struct seq_file *m, loff_t *pos)
2760{
2761 struct ocfs2_dlm_seq_priv *priv = m->private;
2762 struct ocfs2_lock_res *iter;
2763
2764 spin_lock(&ocfs2_dlm_tracking_lock);
2765 iter = ocfs2_dlm_next_res(&priv->p_iter_res, priv);
2766 if (iter) {
2767 /* Since lockres' have the lifetime of their container
2768 * (which can be inodes, ocfs2_supers, etc) we want to
2769 * copy this out to a temporary lockres while still
2770 * under the spinlock. Obviously after this we can't
2771 * trust any pointers on the copy returned, but that's
2772 * ok as the information we want isn't typically held
2773 * in them. */
2774 priv->p_tmp_res = *iter;
2775 iter = &priv->p_tmp_res;
2776 }
2777 spin_unlock(&ocfs2_dlm_tracking_lock);
2778
2779 return iter;
2780}
2781
2782static void ocfs2_dlm_seq_stop(struct seq_file *m, void *v)
2783{
2784}
2785
2786static void *ocfs2_dlm_seq_next(struct seq_file *m, void *v, loff_t *pos)
2787{
2788 struct ocfs2_dlm_seq_priv *priv = m->private;
2789 struct ocfs2_lock_res *iter = v;
2790 struct ocfs2_lock_res *dummy = &priv->p_iter_res;
2791
2792 spin_lock(&ocfs2_dlm_tracking_lock);
2793 iter = ocfs2_dlm_next_res(iter, priv);
2794 list_del_init(&dummy->l_debug_list);
2795 if (iter) {
2796 list_add(&dummy->l_debug_list, &iter->l_debug_list);
2797 priv->p_tmp_res = *iter;
2798 iter = &priv->p_tmp_res;
2799 }
2800 spin_unlock(&ocfs2_dlm_tracking_lock);
2801
2802 return iter;
2803}
2804
Sunil Mushran5bc970e2010-12-28 23:26:03 -08002805/*
2806 * Version is used by debugfs.ocfs2 to determine the format being used
2807 *
2808 * New in version 2
2809 * - Lock stats printed
2810 * New in version 3
2811 * - Max time in lock stats is in usecs (instead of nsecs)
2812 */
2813#define OCFS2_DLM_DEBUG_STR_VERSION 3
Mark Fashehccd979b2005-12-15 14:31:24 -08002814static int ocfs2_dlm_seq_show(struct seq_file *m, void *v)
2815{
2816 int i;
2817 char *lvb;
2818 struct ocfs2_lock_res *lockres = v;
2819
2820 if (!lockres)
2821 return -EINVAL;
2822
Mark Fashehd680efe2006-09-08 14:14:34 -07002823 seq_printf(m, "0x%x\t", OCFS2_DLM_DEBUG_STR_VERSION);
2824
2825 if (lockres->l_type == OCFS2_LOCK_TYPE_DENTRY)
2826 seq_printf(m, "%.*s%08x\t", OCFS2_DENTRY_LOCK_INO_START - 1,
2827 lockres->l_name,
2828 (unsigned int)ocfs2_get_dentry_lock_ino(lockres));
2829 else
2830 seq_printf(m, "%.*s\t", OCFS2_LOCK_ID_MAX_LEN, lockres->l_name);
2831
2832 seq_printf(m, "%d\t"
Mark Fashehccd979b2005-12-15 14:31:24 -08002833 "0x%lx\t"
2834 "0x%x\t"
2835 "0x%x\t"
2836 "%u\t"
2837 "%u\t"
2838 "%d\t"
2839 "%d\t",
Mark Fashehccd979b2005-12-15 14:31:24 -08002840 lockres->l_level,
2841 lockres->l_flags,
2842 lockres->l_action,
2843 lockres->l_unlock_action,
2844 lockres->l_ro_holders,
2845 lockres->l_ex_holders,
2846 lockres->l_requested,
2847 lockres->l_blocking);
2848
2849 /* Dump the raw LVB */
Joel Becker8f2c9c12008-02-01 12:16:57 -08002850 lvb = ocfs2_dlm_lvb(&lockres->l_lksb);
Mark Fashehccd979b2005-12-15 14:31:24 -08002851 for(i = 0; i < DLM_LVB_LEN; i++)
2852 seq_printf(m, "0x%x\t", lvb[i]);
2853
Sunil Mushran8ddb7b02008-05-13 13:45:15 -07002854#ifdef CONFIG_OCFS2_FS_STATS
Sunil Mushran5bc970e2010-12-28 23:26:03 -08002855# define lock_num_prmode(_l) ((_l)->l_lock_prmode.ls_gets)
2856# define lock_num_exmode(_l) ((_l)->l_lock_exmode.ls_gets)
2857# define lock_num_prmode_failed(_l) ((_l)->l_lock_prmode.ls_fail)
2858# define lock_num_exmode_failed(_l) ((_l)->l_lock_exmode.ls_fail)
2859# define lock_total_prmode(_l) ((_l)->l_lock_prmode.ls_total)
2860# define lock_total_exmode(_l) ((_l)->l_lock_exmode.ls_total)
2861# define lock_max_prmode(_l) ((_l)->l_lock_prmode.ls_max)
2862# define lock_max_exmode(_l) ((_l)->l_lock_exmode.ls_max)
2863# define lock_refresh(_l) ((_l)->l_lock_refresh)
Sunil Mushran8ddb7b02008-05-13 13:45:15 -07002864#else
Sunil Mushran5bc970e2010-12-28 23:26:03 -08002865# define lock_num_prmode(_l) (0)
2866# define lock_num_exmode(_l) (0)
Sunil Mushran8ddb7b02008-05-13 13:45:15 -07002867# define lock_num_prmode_failed(_l) (0)
2868# define lock_num_exmode_failed(_l) (0)
Randy Dunlapdd25e552008-05-28 14:41:00 -07002869# define lock_total_prmode(_l) (0ULL)
2870# define lock_total_exmode(_l) (0ULL)
Sunil Mushran8ddb7b02008-05-13 13:45:15 -07002871# define lock_max_prmode(_l) (0)
2872# define lock_max_exmode(_l) (0)
2873# define lock_refresh(_l) (0)
2874#endif
2875 /* The following seq_print was added in version 2 of this output */
Sunil Mushran5bc970e2010-12-28 23:26:03 -08002876 seq_printf(m, "%u\t"
2877 "%u\t"
Sunil Mushran8ddb7b02008-05-13 13:45:15 -07002878 "%u\t"
2879 "%u\t"
2880 "%llu\t"
2881 "%llu\t"
2882 "%u\t"
2883 "%u\t"
2884 "%u\t",
2885 lock_num_prmode(lockres),
2886 lock_num_exmode(lockres),
2887 lock_num_prmode_failed(lockres),
2888 lock_num_exmode_failed(lockres),
2889 lock_total_prmode(lockres),
2890 lock_total_exmode(lockres),
2891 lock_max_prmode(lockres),
2892 lock_max_exmode(lockres),
2893 lock_refresh(lockres));
2894
Mark Fashehccd979b2005-12-15 14:31:24 -08002895 /* End the line */
2896 seq_printf(m, "\n");
2897 return 0;
2898}
2899
Jan Engelhardt90d99772008-01-22 20:52:20 +01002900static const struct seq_operations ocfs2_dlm_seq_ops = {
Mark Fashehccd979b2005-12-15 14:31:24 -08002901 .start = ocfs2_dlm_seq_start,
2902 .stop = ocfs2_dlm_seq_stop,
2903 .next = ocfs2_dlm_seq_next,
2904 .show = ocfs2_dlm_seq_show,
2905};
2906
2907static int ocfs2_dlm_debug_release(struct inode *inode, struct file *file)
2908{
Joe Perches33fa1d92010-07-12 13:50:19 -07002909 struct seq_file *seq = file->private_data;
Mark Fashehccd979b2005-12-15 14:31:24 -08002910 struct ocfs2_dlm_seq_priv *priv = seq->private;
2911 struct ocfs2_lock_res *res = &priv->p_iter_res;
2912
2913 ocfs2_remove_lockres_tracking(res);
2914 ocfs2_put_dlm_debug(priv->p_dlm_debug);
2915 return seq_release_private(inode, file);
2916}
2917
2918static int ocfs2_dlm_debug_open(struct inode *inode, struct file *file)
2919{
Mark Fashehccd979b2005-12-15 14:31:24 -08002920 struct ocfs2_dlm_seq_priv *priv;
Mark Fashehccd979b2005-12-15 14:31:24 -08002921 struct ocfs2_super *osb;
2922
Rob Jones1848cb52014-10-09 15:25:09 -07002923 priv = __seq_open_private(file, &ocfs2_dlm_seq_ops, sizeof(*priv));
Mark Fashehccd979b2005-12-15 14:31:24 -08002924 if (!priv) {
Rob Jones1848cb52014-10-09 15:25:09 -07002925 mlog_errno(-ENOMEM);
2926 return -ENOMEM;
Mark Fashehccd979b2005-12-15 14:31:24 -08002927 }
Rob Jones1848cb52014-10-09 15:25:09 -07002928
Theodore Ts'o8e18e292006-09-27 01:50:46 -07002929 osb = inode->i_private;
Mark Fashehccd979b2005-12-15 14:31:24 -08002930 ocfs2_get_dlm_debug(osb->osb_dlm_debug);
2931 priv->p_dlm_debug = osb->osb_dlm_debug;
2932 INIT_LIST_HEAD(&priv->p_iter_res.l_debug_list);
2933
Mark Fashehccd979b2005-12-15 14:31:24 -08002934 ocfs2_add_lockres_tracking(&priv->p_iter_res,
2935 priv->p_dlm_debug);
2936
Rob Jones1848cb52014-10-09 15:25:09 -07002937 return 0;
Mark Fashehccd979b2005-12-15 14:31:24 -08002938}
2939
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -08002940static const struct file_operations ocfs2_dlm_debug_fops = {
Mark Fashehccd979b2005-12-15 14:31:24 -08002941 .open = ocfs2_dlm_debug_open,
2942 .release = ocfs2_dlm_debug_release,
2943 .read = seq_read,
2944 .llseek = seq_lseek,
2945};
2946
2947static int ocfs2_dlm_init_debug(struct ocfs2_super *osb)
2948{
2949 int ret = 0;
2950 struct ocfs2_dlm_debug *dlm_debug = osb->osb_dlm_debug;
2951
2952 dlm_debug->d_locking_state = debugfs_create_file("locking_state",
2953 S_IFREG|S_IRUSR,
2954 osb->osb_debug_root,
2955 osb,
2956 &ocfs2_dlm_debug_fops);
2957 if (!dlm_debug->d_locking_state) {
2958 ret = -EINVAL;
2959 mlog(ML_ERROR,
2960 "Unable to create locking state debugfs file.\n");
2961 goto out;
2962 }
2963
2964 ocfs2_get_dlm_debug(dlm_debug);
2965out:
2966 return ret;
2967}
2968
2969static void ocfs2_dlm_shutdown_debug(struct ocfs2_super *osb)
2970{
2971 struct ocfs2_dlm_debug *dlm_debug = osb->osb_dlm_debug;
2972
2973 if (dlm_debug) {
2974 debugfs_remove(dlm_debug->d_locking_state);
2975 ocfs2_put_dlm_debug(dlm_debug);
2976 }
2977}
2978
2979int ocfs2_dlm_init(struct ocfs2_super *osb)
2980{
Sunil Mushranc271c5c2006-12-05 17:56:35 -08002981 int status = 0;
Joel Becker4670c462008-02-01 14:39:35 -08002982 struct ocfs2_cluster_connection *conn = NULL;
Mark Fashehccd979b2005-12-15 14:31:24 -08002983
Mark Fasheh0abd6d12008-01-29 16:59:56 -08002984 if (ocfs2_mount_local(osb)) {
2985 osb->node_num = 0;
Sunil Mushranc271c5c2006-12-05 17:56:35 -08002986 goto local;
Mark Fasheh0abd6d12008-01-29 16:59:56 -08002987 }
Sunil Mushranc271c5c2006-12-05 17:56:35 -08002988
Mark Fashehccd979b2005-12-15 14:31:24 -08002989 status = ocfs2_dlm_init_debug(osb);
2990 if (status < 0) {
2991 mlog_errno(status);
2992 goto bail;
2993 }
2994
Mark Fasheh34d024f2007-09-24 15:56:19 -07002995 /* launch downconvert thread */
2996 osb->dc_task = kthread_run(ocfs2_downconvert_thread, osb, "ocfs2dc");
2997 if (IS_ERR(osb->dc_task)) {
2998 status = PTR_ERR(osb->dc_task);
2999 osb->dc_task = NULL;
Mark Fashehccd979b2005-12-15 14:31:24 -08003000 mlog_errno(status);
3001 goto bail;
3002 }
3003
Mark Fashehccd979b2005-12-15 14:31:24 -08003004 /* for now, uuid == domain */
Joel Becker9c6c8772008-02-01 15:17:30 -08003005 status = ocfs2_cluster_connect(osb->osb_cluster_stack,
Goldwyn Rodriguesc74a3bd2014-01-21 15:48:21 -08003006 osb->osb_cluster_name,
3007 strlen(osb->osb_cluster_name),
Joel Becker9c6c8772008-02-01 15:17:30 -08003008 osb->uuid_str,
Joel Becker4670c462008-02-01 14:39:35 -08003009 strlen(osb->uuid_str),
Joel Becker553b5eb2010-01-29 17:19:06 -08003010 &lproto, ocfs2_do_node_down, osb,
Joel Becker4670c462008-02-01 14:39:35 -08003011 &conn);
3012 if (status) {
Mark Fashehccd979b2005-12-15 14:31:24 -08003013 mlog_errno(status);
3014 goto bail;
3015 }
3016
Goldwyn Rodrigues3e834152014-01-21 15:48:24 -08003017 status = ocfs2_cluster_this_node(conn, &osb->node_num);
Mark Fasheh0abd6d12008-01-29 16:59:56 -08003018 if (status < 0) {
3019 mlog_errno(status);
3020 mlog(ML_ERROR,
3021 "could not find this host's node number\n");
Joel Becker286eaa92008-02-01 15:03:57 -08003022 ocfs2_cluster_disconnect(conn, 0);
Mark Fasheh0abd6d12008-01-29 16:59:56 -08003023 goto bail;
3024 }
3025
Sunil Mushranc271c5c2006-12-05 17:56:35 -08003026local:
Mark Fashehccd979b2005-12-15 14:31:24 -08003027 ocfs2_super_lock_res_init(&osb->osb_super_lockres, osb);
3028 ocfs2_rename_lock_res_init(&osb->osb_rename_lockres, osb);
wengang wang6ca497a2009-03-06 21:29:10 +08003029 ocfs2_nfs_sync_lock_res_init(&osb->osb_nfs_sync_lockres, osb);
Srinivas Eeda83273932009-06-03 17:02:55 -07003030 ocfs2_orphan_scan_lock_res_init(&osb->osb_orphan_scan.os_lockres, osb);
Mark Fashehccd979b2005-12-15 14:31:24 -08003031
Joel Becker4670c462008-02-01 14:39:35 -08003032 osb->cconn = conn;
Mark Fashehccd979b2005-12-15 14:31:24 -08003033
3034 status = 0;
3035bail:
3036 if (status < 0) {
3037 ocfs2_dlm_shutdown_debug(osb);
Mark Fasheh34d024f2007-09-24 15:56:19 -07003038 if (osb->dc_task)
3039 kthread_stop(osb->dc_task);
Mark Fashehccd979b2005-12-15 14:31:24 -08003040 }
3041
Mark Fashehccd979b2005-12-15 14:31:24 -08003042 return status;
3043}
3044
Joel Becker286eaa92008-02-01 15:03:57 -08003045void ocfs2_dlm_shutdown(struct ocfs2_super *osb,
3046 int hangup_pending)
Mark Fashehccd979b2005-12-15 14:31:24 -08003047{
Mark Fashehccd979b2005-12-15 14:31:24 -08003048 ocfs2_drop_osb_locks(osb);
3049
Joel Becker4670c462008-02-01 14:39:35 -08003050 /*
3051 * Now that we have dropped all locks and ocfs2_dismount_volume()
3052 * has disabled recovery, the DLM won't be talking to us. It's
3053 * safe to tear things down before disconnecting the cluster.
3054 */
3055
Mark Fasheh34d024f2007-09-24 15:56:19 -07003056 if (osb->dc_task) {
3057 kthread_stop(osb->dc_task);
3058 osb->dc_task = NULL;
Mark Fashehccd979b2005-12-15 14:31:24 -08003059 }
3060
3061 ocfs2_lock_res_free(&osb->osb_super_lockres);
3062 ocfs2_lock_res_free(&osb->osb_rename_lockres);
wengang wang6ca497a2009-03-06 21:29:10 +08003063 ocfs2_lock_res_free(&osb->osb_nfs_sync_lockres);
Srinivas Eeda83273932009-06-03 17:02:55 -07003064 ocfs2_lock_res_free(&osb->osb_orphan_scan.os_lockres);
Mark Fashehccd979b2005-12-15 14:31:24 -08003065
Joel Becker286eaa92008-02-01 15:03:57 -08003066 ocfs2_cluster_disconnect(osb->cconn, hangup_pending);
Joel Becker4670c462008-02-01 14:39:35 -08003067 osb->cconn = NULL;
Mark Fashehccd979b2005-12-15 14:31:24 -08003068
3069 ocfs2_dlm_shutdown_debug(osb);
Mark Fashehccd979b2005-12-15 14:31:24 -08003070}
3071
Mark Fashehccd979b2005-12-15 14:31:24 -08003072static int ocfs2_drop_lock(struct ocfs2_super *osb,
Mark Fasheh0d5dc6c2006-09-14 14:44:51 -07003073 struct ocfs2_lock_res *lockres)
Mark Fashehccd979b2005-12-15 14:31:24 -08003074{
Joel Becker7431cd72008-02-01 12:15:37 -08003075 int ret;
Mark Fashehccd979b2005-12-15 14:31:24 -08003076 unsigned long flags;
Joel Beckerbd3e7612008-02-01 12:14:57 -08003077 u32 lkm_flags = 0;
Mark Fashehccd979b2005-12-15 14:31:24 -08003078
3079 /* We didn't get anywhere near actually using this lockres. */
3080 if (!(lockres->l_flags & OCFS2_LOCK_INITIALIZED))
3081 goto out;
3082
Mark Fashehb80fc012006-09-12 22:08:14 -07003083 if (lockres->l_ops->flags & LOCK_TYPE_USES_LVB)
Joel Beckerbd3e7612008-02-01 12:14:57 -08003084 lkm_flags |= DLM_LKF_VALBLK;
Mark Fashehb80fc012006-09-12 22:08:14 -07003085
Mark Fashehccd979b2005-12-15 14:31:24 -08003086 spin_lock_irqsave(&lockres->l_lock, flags);
3087
3088 mlog_bug_on_msg(!(lockres->l_flags & OCFS2_LOCK_FREEING),
3089 "lockres %s, flags 0x%lx\n",
3090 lockres->l_name, lockres->l_flags);
3091
3092 while (lockres->l_flags & OCFS2_LOCK_BUSY) {
3093 mlog(0, "waiting on busy lock \"%s\": flags = %lx, action = "
3094 "%u, unlock_action = %u\n",
3095 lockres->l_name, lockres->l_flags, lockres->l_action,
3096 lockres->l_unlock_action);
3097
3098 spin_unlock_irqrestore(&lockres->l_lock, flags);
3099
3100 /* XXX: Today we just wait on any busy
3101 * locks... Perhaps we need to cancel converts in the
3102 * future? */
3103 ocfs2_wait_on_busy_lock(lockres);
3104
3105 spin_lock_irqsave(&lockres->l_lock, flags);
3106 }
3107
Mark Fasheh0d5dc6c2006-09-14 14:44:51 -07003108 if (lockres->l_ops->flags & LOCK_TYPE_USES_LVB) {
3109 if (lockres->l_flags & OCFS2_LOCK_ATTACHED &&
Joel Beckerbd3e7612008-02-01 12:14:57 -08003110 lockres->l_level == DLM_LOCK_EX &&
Mark Fasheh0d5dc6c2006-09-14 14:44:51 -07003111 !(lockres->l_flags & OCFS2_LOCK_NEEDS_REFRESH))
3112 lockres->l_ops->set_lvb(lockres);
3113 }
Mark Fashehccd979b2005-12-15 14:31:24 -08003114
3115 if (lockres->l_flags & OCFS2_LOCK_BUSY)
3116 mlog(ML_ERROR, "destroying busy lock: \"%s\"\n",
3117 lockres->l_name);
3118 if (lockres->l_flags & OCFS2_LOCK_BLOCKED)
3119 mlog(0, "destroying blocked lock: \"%s\"\n", lockres->l_name);
3120
3121 if (!(lockres->l_flags & OCFS2_LOCK_ATTACHED)) {
3122 spin_unlock_irqrestore(&lockres->l_lock, flags);
3123 goto out;
3124 }
3125
3126 lockres_clear_flags(lockres, OCFS2_LOCK_ATTACHED);
3127
3128 /* make sure we never get here while waiting for an ast to
3129 * fire. */
3130 BUG_ON(lockres->l_action != OCFS2_AST_INVALID);
3131
3132 /* is this necessary? */
3133 lockres_or_flags(lockres, OCFS2_LOCK_BUSY);
3134 lockres->l_unlock_action = OCFS2_UNLOCK_DROP_LOCK;
3135 spin_unlock_irqrestore(&lockres->l_lock, flags);
3136
3137 mlog(0, "lock %s\n", lockres->l_name);
3138
Joel Beckera796d282010-01-28 19:22:39 -08003139 ret = ocfs2_dlm_unlock(osb->cconn, &lockres->l_lksb, lkm_flags);
Joel Becker7431cd72008-02-01 12:15:37 -08003140 if (ret) {
3141 ocfs2_log_dlm_error("ocfs2_dlm_unlock", ret, lockres);
Mark Fashehccd979b2005-12-15 14:31:24 -08003142 mlog(ML_ERROR, "lockres flags: %lu\n", lockres->l_flags);
Joel Beckercf0acdc2008-01-29 16:59:55 -08003143 ocfs2_dlm_dump_lksb(&lockres->l_lksb);
Mark Fashehccd979b2005-12-15 14:31:24 -08003144 BUG();
3145 }
Coly Li73ac36e2009-01-07 18:09:16 -08003146 mlog(0, "lock %s, successful return from ocfs2_dlm_unlock\n",
Mark Fashehccd979b2005-12-15 14:31:24 -08003147 lockres->l_name);
3148
3149 ocfs2_wait_on_busy_lock(lockres);
3150out:
Mark Fashehccd979b2005-12-15 14:31:24 -08003151 return 0;
3152}
3153
Jan Kara84d86f82014-04-03 14:46:57 -07003154static void ocfs2_process_blocked_lock(struct ocfs2_super *osb,
3155 struct ocfs2_lock_res *lockres);
3156
Mark Fashehccd979b2005-12-15 14:31:24 -08003157/* Mark the lockres as being dropped. It will no longer be
3158 * queued if blocking, but we still may have to wait on it
Mark Fasheh34d024f2007-09-24 15:56:19 -07003159 * being dequeued from the downconvert thread before we can consider
Sunil Mushran2bd63212010-01-25 16:57:38 -08003160 * it safe to drop.
Mark Fashehccd979b2005-12-15 14:31:24 -08003161 *
3162 * You can *not* attempt to call cluster_lock on this lockres anymore. */
Jan Kara84d86f82014-04-03 14:46:57 -07003163void ocfs2_mark_lockres_freeing(struct ocfs2_super *osb,
3164 struct ocfs2_lock_res *lockres)
Mark Fashehccd979b2005-12-15 14:31:24 -08003165{
3166 int status;
3167 struct ocfs2_mask_waiter mw;
Jan Kara84d86f82014-04-03 14:46:57 -07003168 unsigned long flags, flags2;
Mark Fashehccd979b2005-12-15 14:31:24 -08003169
3170 ocfs2_init_mask_waiter(&mw);
3171
3172 spin_lock_irqsave(&lockres->l_lock, flags);
3173 lockres->l_flags |= OCFS2_LOCK_FREEING;
Jan Kara84d86f82014-04-03 14:46:57 -07003174 if (lockres->l_flags & OCFS2_LOCK_QUEUED && current == osb->dc_task) {
3175 /*
3176 * We know the downconvert is queued but not in progress
3177 * because we are the downconvert thread and processing
3178 * different lock. So we can just remove the lock from the
3179 * queue. This is not only an optimization but also a way
3180 * to avoid the following deadlock:
3181 * ocfs2_dentry_post_unlock()
3182 * ocfs2_dentry_lock_put()
3183 * ocfs2_drop_dentry_lock()
3184 * iput()
3185 * ocfs2_evict_inode()
3186 * ocfs2_clear_inode()
3187 * ocfs2_mark_lockres_freeing()
3188 * ... blocks waiting for OCFS2_LOCK_QUEUED
3189 * since we are the downconvert thread which
3190 * should clear the flag.
3191 */
3192 spin_unlock_irqrestore(&lockres->l_lock, flags);
3193 spin_lock_irqsave(&osb->dc_task_lock, flags2);
3194 list_del_init(&lockres->l_blocked_list);
3195 osb->blocked_lock_count--;
3196 spin_unlock_irqrestore(&osb->dc_task_lock, flags2);
3197 /*
3198 * Warn if we recurse into another post_unlock call. Strictly
3199 * speaking it isn't a problem but we need to be careful if
3200 * that happens (stack overflow, deadlocks, ...) so warn if
3201 * ocfs2 grows a path for which this can happen.
3202 */
3203 WARN_ON_ONCE(lockres->l_ops->post_unlock);
3204 /* Since the lock is freeing we don't do much in the fn below */
3205 ocfs2_process_blocked_lock(osb, lockres);
3206 return;
3207 }
Mark Fashehccd979b2005-12-15 14:31:24 -08003208 while (lockres->l_flags & OCFS2_LOCK_QUEUED) {
3209 lockres_add_mask_waiter(lockres, &mw, OCFS2_LOCK_QUEUED, 0);
3210 spin_unlock_irqrestore(&lockres->l_lock, flags);
3211
3212 mlog(0, "Waiting on lockres %s\n", lockres->l_name);
3213
3214 status = ocfs2_wait_for_mask(&mw);
3215 if (status)
3216 mlog_errno(status);
3217
3218 spin_lock_irqsave(&lockres->l_lock, flags);
3219 }
3220 spin_unlock_irqrestore(&lockres->l_lock, flags);
3221}
3222
Mark Fashehd680efe2006-09-08 14:14:34 -07003223void ocfs2_simple_drop_lockres(struct ocfs2_super *osb,
3224 struct ocfs2_lock_res *lockres)
3225{
3226 int ret;
3227
Jan Kara84d86f82014-04-03 14:46:57 -07003228 ocfs2_mark_lockres_freeing(osb, lockres);
Mark Fasheh0d5dc6c2006-09-14 14:44:51 -07003229 ret = ocfs2_drop_lock(osb, lockres);
Mark Fashehd680efe2006-09-08 14:14:34 -07003230 if (ret)
3231 mlog_errno(ret);
3232}
3233
Mark Fashehccd979b2005-12-15 14:31:24 -08003234static void ocfs2_drop_osb_locks(struct ocfs2_super *osb)
3235{
Mark Fashehd680efe2006-09-08 14:14:34 -07003236 ocfs2_simple_drop_lockres(osb, &osb->osb_super_lockres);
3237 ocfs2_simple_drop_lockres(osb, &osb->osb_rename_lockres);
wengang wang6ca497a2009-03-06 21:29:10 +08003238 ocfs2_simple_drop_lockres(osb, &osb->osb_nfs_sync_lockres);
Srinivas Eeda83273932009-06-03 17:02:55 -07003239 ocfs2_simple_drop_lockres(osb, &osb->osb_orphan_scan.os_lockres);
Mark Fashehccd979b2005-12-15 14:31:24 -08003240}
3241
Mark Fashehccd979b2005-12-15 14:31:24 -08003242int ocfs2_drop_inode_locks(struct inode *inode)
3243{
3244 int status, err;
Mark Fashehccd979b2005-12-15 14:31:24 -08003245
Mark Fashehccd979b2005-12-15 14:31:24 -08003246 /* No need to call ocfs2_mark_lockres_freeing here -
3247 * ocfs2_clear_inode has done it for us. */
3248
3249 err = ocfs2_drop_lock(OCFS2_SB(inode->i_sb),
Tiger Yang50008632007-03-20 16:01:38 -07003250 &OCFS2_I(inode)->ip_open_lockres);
Mark Fashehccd979b2005-12-15 14:31:24 -08003251 if (err < 0)
3252 mlog_errno(err);
3253
3254 status = err;
3255
3256 err = ocfs2_drop_lock(OCFS2_SB(inode->i_sb),
Mark Fashehe63aecb62007-10-18 15:30:42 -07003257 &OCFS2_I(inode)->ip_inode_lockres);
Mark Fashehccd979b2005-12-15 14:31:24 -08003258 if (err < 0)
3259 mlog_errno(err);
3260 if (err < 0 && !status)
3261 status = err;
3262
3263 err = ocfs2_drop_lock(OCFS2_SB(inode->i_sb),
Mark Fasheh0d5dc6c2006-09-14 14:44:51 -07003264 &OCFS2_I(inode)->ip_rw_lockres);
Mark Fashehccd979b2005-12-15 14:31:24 -08003265 if (err < 0)
3266 mlog_errno(err);
3267 if (err < 0 && !status)
3268 status = err;
3269
Mark Fashehccd979b2005-12-15 14:31:24 -08003270 return status;
3271}
3272
Joel Beckerde551242008-02-01 14:45:08 -08003273static unsigned int ocfs2_prepare_downconvert(struct ocfs2_lock_res *lockres,
3274 int new_level)
Mark Fashehccd979b2005-12-15 14:31:24 -08003275{
3276 assert_spin_locked(&lockres->l_lock);
3277
Joel Beckerbd3e7612008-02-01 12:14:57 -08003278 BUG_ON(lockres->l_blocking <= DLM_LOCK_NL);
Mark Fashehccd979b2005-12-15 14:31:24 -08003279
3280 if (lockres->l_level <= new_level) {
Sunil Mushran9b915182010-02-26 19:42:44 -08003281 mlog(ML_ERROR, "lockres %s, lvl %d <= %d, blcklst %d, mask %d, "
3282 "type %d, flags 0x%lx, hold %d %d, act %d %d, req %d, "
3283 "block %d, pgen %d\n", lockres->l_name, lockres->l_level,
3284 new_level, list_empty(&lockres->l_blocked_list),
3285 list_empty(&lockres->l_mask_waiters), lockres->l_type,
3286 lockres->l_flags, lockres->l_ro_holders,
3287 lockres->l_ex_holders, lockres->l_action,
3288 lockres->l_unlock_action, lockres->l_requested,
3289 lockres->l_blocking, lockres->l_pending_gen);
Mark Fashehccd979b2005-12-15 14:31:24 -08003290 BUG();
3291 }
3292
Sunil Mushran9b915182010-02-26 19:42:44 -08003293 mlog(ML_BASTS, "lockres %s, level %d => %d, blocking %d\n",
3294 lockres->l_name, lockres->l_level, new_level, lockres->l_blocking);
Mark Fashehccd979b2005-12-15 14:31:24 -08003295
3296 lockres->l_action = OCFS2_AST_DOWNCONVERT;
3297 lockres->l_requested = new_level;
3298 lockres_or_flags(lockres, OCFS2_LOCK_BUSY);
Joel Beckerde551242008-02-01 14:45:08 -08003299 return lockres_set_pending(lockres);
Mark Fashehccd979b2005-12-15 14:31:24 -08003300}
3301
3302static int ocfs2_downconvert_lock(struct ocfs2_super *osb,
3303 struct ocfs2_lock_res *lockres,
3304 int new_level,
Joel Beckerde551242008-02-01 14:45:08 -08003305 int lvb,
3306 unsigned int generation)
Mark Fashehccd979b2005-12-15 14:31:24 -08003307{
Joel Beckerbd3e7612008-02-01 12:14:57 -08003308 int ret;
3309 u32 dlm_flags = DLM_LKF_CONVERT;
Mark Fashehccd979b2005-12-15 14:31:24 -08003310
Sunil Mushran9b915182010-02-26 19:42:44 -08003311 mlog(ML_BASTS, "lockres %s, level %d => %d\n", lockres->l_name,
3312 lockres->l_level, new_level);
3313
Mark Fashehccd979b2005-12-15 14:31:24 -08003314 if (lvb)
Joel Beckerbd3e7612008-02-01 12:14:57 -08003315 dlm_flags |= DLM_LKF_VALBLK;
Mark Fashehccd979b2005-12-15 14:31:24 -08003316
Joel Becker4670c462008-02-01 14:39:35 -08003317 ret = ocfs2_dlm_lock(osb->cconn,
Joel Becker7431cd72008-02-01 12:15:37 -08003318 new_level,
3319 &lockres->l_lksb,
3320 dlm_flags,
3321 lockres->l_name,
Joel Beckera796d282010-01-28 19:22:39 -08003322 OCFS2_LOCK_ID_MAX_LEN - 1);
Joel Beckerde551242008-02-01 14:45:08 -08003323 lockres_clear_pending(lockres, generation, osb);
Joel Becker7431cd72008-02-01 12:15:37 -08003324 if (ret) {
3325 ocfs2_log_dlm_error("ocfs2_dlm_lock", ret, lockres);
Mark Fashehccd979b2005-12-15 14:31:24 -08003326 ocfs2_recover_from_dlm_error(lockres, 1);
3327 goto bail;
3328 }
3329
3330 ret = 0;
3331bail:
Mark Fashehccd979b2005-12-15 14:31:24 -08003332 return ret;
3333}
3334
Joel Becker24ef1812008-01-29 17:37:32 -08003335/* returns 1 when the caller should unlock and call ocfs2_dlm_unlock */
Mark Fashehccd979b2005-12-15 14:31:24 -08003336static int ocfs2_prepare_cancel_convert(struct ocfs2_super *osb,
3337 struct ocfs2_lock_res *lockres)
3338{
3339 assert_spin_locked(&lockres->l_lock);
3340
Mark Fashehccd979b2005-12-15 14:31:24 -08003341 if (lockres->l_unlock_action == OCFS2_UNLOCK_CANCEL_CONVERT) {
3342 /* If we're already trying to cancel a lock conversion
3343 * then just drop the spinlock and allow the caller to
3344 * requeue this lock. */
Sunil Mushran9b915182010-02-26 19:42:44 -08003345 mlog(ML_BASTS, "lockres %s, skip convert\n", lockres->l_name);
Mark Fashehccd979b2005-12-15 14:31:24 -08003346 return 0;
3347 }
3348
3349 /* were we in a convert when we got the bast fire? */
3350 BUG_ON(lockres->l_action != OCFS2_AST_CONVERT &&
3351 lockres->l_action != OCFS2_AST_DOWNCONVERT);
3352 /* set things up for the unlockast to know to just
3353 * clear out the ast_action and unset busy, etc. */
3354 lockres->l_unlock_action = OCFS2_UNLOCK_CANCEL_CONVERT;
3355
3356 mlog_bug_on_msg(!(lockres->l_flags & OCFS2_LOCK_BUSY),
3357 "lock %s, invalid flags: 0x%lx\n",
3358 lockres->l_name, lockres->l_flags);
3359
Sunil Mushran9b915182010-02-26 19:42:44 -08003360 mlog(ML_BASTS, "lockres %s\n", lockres->l_name);
3361
Mark Fashehccd979b2005-12-15 14:31:24 -08003362 return 1;
3363}
3364
3365static int ocfs2_cancel_convert(struct ocfs2_super *osb,
3366 struct ocfs2_lock_res *lockres)
3367{
3368 int ret;
Mark Fashehccd979b2005-12-15 14:31:24 -08003369
Joel Becker4670c462008-02-01 14:39:35 -08003370 ret = ocfs2_dlm_unlock(osb->cconn, &lockres->l_lksb,
Joel Beckera796d282010-01-28 19:22:39 -08003371 DLM_LKF_CANCEL);
Joel Becker7431cd72008-02-01 12:15:37 -08003372 if (ret) {
3373 ocfs2_log_dlm_error("ocfs2_dlm_unlock", ret, lockres);
Mark Fashehccd979b2005-12-15 14:31:24 -08003374 ocfs2_recover_from_dlm_error(lockres, 0);
3375 }
3376
Sunil Mushran9b915182010-02-26 19:42:44 -08003377 mlog(ML_BASTS, "lockres %s\n", lockres->l_name);
Mark Fashehccd979b2005-12-15 14:31:24 -08003378
Mark Fashehccd979b2005-12-15 14:31:24 -08003379 return ret;
3380}
3381
Mark Fashehb5e500e2006-09-13 22:01:16 -07003382static int ocfs2_unblock_lock(struct ocfs2_super *osb,
3383 struct ocfs2_lock_res *lockres,
3384 struct ocfs2_unblock_ctl *ctl)
Mark Fashehccd979b2005-12-15 14:31:24 -08003385{
3386 unsigned long flags;
3387 int blocking;
3388 int new_level;
Sunil Mushran079b8052010-02-03 10:16:54 -08003389 int level;
Mark Fashehccd979b2005-12-15 14:31:24 -08003390 int ret = 0;
Mark Fasheh5ef0d4e2006-09-13 21:21:52 -07003391 int set_lvb = 0;
Joel Beckerde551242008-02-01 14:45:08 -08003392 unsigned int gen;
Mark Fashehccd979b2005-12-15 14:31:24 -08003393
Mark Fashehccd979b2005-12-15 14:31:24 -08003394 spin_lock_irqsave(&lockres->l_lock, flags);
3395
Mark Fashehccd979b2005-12-15 14:31:24 -08003396recheck:
Sunil Mushrandb0f6ce2010-02-01 16:55:50 -08003397 /*
3398 * Is it still blocking? If not, we have no more work to do.
3399 */
3400 if (!(lockres->l_flags & OCFS2_LOCK_BLOCKED)) {
3401 BUG_ON(lockres->l_blocking != DLM_LOCK_NL);
3402 spin_unlock_irqrestore(&lockres->l_lock, flags);
3403 ret = 0;
3404 goto leave;
3405 }
3406
Mark Fashehccd979b2005-12-15 14:31:24 -08003407 if (lockres->l_flags & OCFS2_LOCK_BUSY) {
Joel Beckerde551242008-02-01 14:45:08 -08003408 /* XXX
3409 * This is a *big* race. The OCFS2_LOCK_PENDING flag
3410 * exists entirely for one reason - another thread has set
3411 * OCFS2_LOCK_BUSY, but has *NOT* yet called dlm_lock().
3412 *
3413 * If we do ocfs2_cancel_convert() before the other thread
3414 * calls dlm_lock(), our cancel will do nothing. We will
3415 * get no ast, and we will have no way of knowing the
3416 * cancel failed. Meanwhile, the other thread will call
3417 * into dlm_lock() and wait...forever.
3418 *
3419 * Why forever? Because another node has asked for the
3420 * lock first; that's why we're here in unblock_lock().
3421 *
3422 * The solution is OCFS2_LOCK_PENDING. When PENDING is
3423 * set, we just requeue the unblock. Only when the other
3424 * thread has called dlm_lock() and cleared PENDING will
3425 * we then cancel their request.
3426 *
3427 * All callers of dlm_lock() must set OCFS2_DLM_PENDING
3428 * at the same time they set OCFS2_DLM_BUSY. They must
3429 * clear OCFS2_DLM_PENDING after dlm_lock() returns.
3430 */
Sunil Mushran9b915182010-02-26 19:42:44 -08003431 if (lockres->l_flags & OCFS2_LOCK_PENDING) {
3432 mlog(ML_BASTS, "lockres %s, ReQ: Pending\n",
3433 lockres->l_name);
Joel Beckerde551242008-02-01 14:45:08 -08003434 goto leave_requeue;
Sunil Mushran9b915182010-02-26 19:42:44 -08003435 }
Joel Beckerde551242008-02-01 14:45:08 -08003436
Mark Fashehd680efe2006-09-08 14:14:34 -07003437 ctl->requeue = 1;
Mark Fashehccd979b2005-12-15 14:31:24 -08003438 ret = ocfs2_prepare_cancel_convert(osb, lockres);
3439 spin_unlock_irqrestore(&lockres->l_lock, flags);
3440 if (ret) {
3441 ret = ocfs2_cancel_convert(osb, lockres);
3442 if (ret < 0)
3443 mlog_errno(ret);
3444 }
3445 goto leave;
3446 }
3447
Sunil Mushrana1912822010-01-21 10:50:03 -08003448 /*
3449 * This prevents livelocks. OCFS2_LOCK_UPCONVERT_FINISHING flag is
3450 * set when the ast is received for an upconvert just before the
3451 * OCFS2_LOCK_BUSY flag is cleared. Now if the fs received a bast
3452 * on the heels of the ast, we want to delay the downconvert just
3453 * enough to allow the up requestor to do its task. Because this
3454 * lock is in the blocked queue, the lock will be downconverted
3455 * as soon as the requestor is done with the lock.
3456 */
3457 if (lockres->l_flags & OCFS2_LOCK_UPCONVERT_FINISHING)
3458 goto leave_requeue;
3459
Sunil Mushran0d741252010-01-29 09:44:11 -08003460 /*
3461 * How can we block and yet be at NL? We were trying to upconvert
3462 * from NL and got canceled. The code comes back here, and now
3463 * we notice and clear BLOCKING.
3464 */
3465 if (lockres->l_level == DLM_LOCK_NL) {
3466 BUG_ON(lockres->l_ex_holders || lockres->l_ro_holders);
Sunil Mushran9b915182010-02-26 19:42:44 -08003467 mlog(ML_BASTS, "lockres %s, Aborting dc\n", lockres->l_name);
Sunil Mushran0d741252010-01-29 09:44:11 -08003468 lockres->l_blocking = DLM_LOCK_NL;
3469 lockres_clear_flags(lockres, OCFS2_LOCK_BLOCKED);
3470 spin_unlock_irqrestore(&lockres->l_lock, flags);
3471 goto leave;
3472 }
3473
Mark Fashehccd979b2005-12-15 14:31:24 -08003474 /* if we're blocking an exclusive and we have *any* holders,
3475 * then requeue. */
Joel Beckerbd3e7612008-02-01 12:14:57 -08003476 if ((lockres->l_blocking == DLM_LOCK_EX)
Sunil Mushran9b915182010-02-26 19:42:44 -08003477 && (lockres->l_ex_holders || lockres->l_ro_holders)) {
3478 mlog(ML_BASTS, "lockres %s, ReQ: EX/PR Holders %u,%u\n",
3479 lockres->l_name, lockres->l_ex_holders,
3480 lockres->l_ro_holders);
Mark Fashehf7fbfdd2006-09-13 21:02:29 -07003481 goto leave_requeue;
Sunil Mushran9b915182010-02-26 19:42:44 -08003482 }
Mark Fashehccd979b2005-12-15 14:31:24 -08003483
3484 /* If it's a PR we're blocking, then only
3485 * requeue if we've got any EX holders */
Joel Beckerbd3e7612008-02-01 12:14:57 -08003486 if (lockres->l_blocking == DLM_LOCK_PR &&
Sunil Mushran9b915182010-02-26 19:42:44 -08003487 lockres->l_ex_holders) {
3488 mlog(ML_BASTS, "lockres %s, ReQ: EX Holders %u\n",
3489 lockres->l_name, lockres->l_ex_holders);
Mark Fashehf7fbfdd2006-09-13 21:02:29 -07003490 goto leave_requeue;
Sunil Mushran9b915182010-02-26 19:42:44 -08003491 }
Mark Fashehf7fbfdd2006-09-13 21:02:29 -07003492
3493 /*
3494 * Can we get a lock in this state if the holder counts are
3495 * zero? The meta data unblock code used to check this.
3496 */
3497 if ((lockres->l_ops->flags & LOCK_TYPE_REQUIRES_REFRESH)
Sunil Mushran9b915182010-02-26 19:42:44 -08003498 && (lockres->l_flags & OCFS2_LOCK_REFRESHING)) {
3499 mlog(ML_BASTS, "lockres %s, ReQ: Lock Refreshing\n",
3500 lockres->l_name);
Mark Fashehf7fbfdd2006-09-13 21:02:29 -07003501 goto leave_requeue;
Sunil Mushran9b915182010-02-26 19:42:44 -08003502 }
Mark Fashehccd979b2005-12-15 14:31:24 -08003503
Mark Fasheh16d5b952006-09-13 21:10:12 -07003504 new_level = ocfs2_highest_compat_lock_level(lockres->l_blocking);
3505
3506 if (lockres->l_ops->check_downconvert
Sunil Mushran9b915182010-02-26 19:42:44 -08003507 && !lockres->l_ops->check_downconvert(lockres, new_level)) {
3508 mlog(ML_BASTS, "lockres %s, ReQ: Checkpointing\n",
3509 lockres->l_name);
Mark Fasheh16d5b952006-09-13 21:10:12 -07003510 goto leave_requeue;
Sunil Mushran9b915182010-02-26 19:42:44 -08003511 }
Mark Fasheh16d5b952006-09-13 21:10:12 -07003512
Mark Fashehccd979b2005-12-15 14:31:24 -08003513 /* If we get here, then we know that there are no more
3514 * incompatible holders (and anyone asking for an incompatible
3515 * lock is blocked). We can now downconvert the lock */
Mark Fashehcc567d82006-09-13 21:52:21 -07003516 if (!lockres->l_ops->downconvert_worker)
Mark Fashehccd979b2005-12-15 14:31:24 -08003517 goto downconvert;
3518
3519 /* Some lockres types want to do a bit of work before
3520 * downconverting a lock. Allow that here. The worker function
3521 * may sleep, so we save off a copy of what we're blocking as
3522 * it may change while we're not holding the spin lock. */
3523 blocking = lockres->l_blocking;
Sunil Mushran079b8052010-02-03 10:16:54 -08003524 level = lockres->l_level;
Mark Fashehccd979b2005-12-15 14:31:24 -08003525 spin_unlock_irqrestore(&lockres->l_lock, flags);
3526
Mark Fashehcc567d82006-09-13 21:52:21 -07003527 ctl->unblock_action = lockres->l_ops->downconvert_worker(lockres, blocking);
Mark Fashehd680efe2006-09-08 14:14:34 -07003528
Sunil Mushran9b915182010-02-26 19:42:44 -08003529 if (ctl->unblock_action == UNBLOCK_STOP_POST) {
3530 mlog(ML_BASTS, "lockres %s, UNBLOCK_STOP_POST\n",
3531 lockres->l_name);
Mark Fashehd680efe2006-09-08 14:14:34 -07003532 goto leave;
Sunil Mushran9b915182010-02-26 19:42:44 -08003533 }
Mark Fashehccd979b2005-12-15 14:31:24 -08003534
3535 spin_lock_irqsave(&lockres->l_lock, flags);
Sunil Mushran079b8052010-02-03 10:16:54 -08003536 if ((blocking != lockres->l_blocking) || (level != lockres->l_level)) {
Mark Fashehccd979b2005-12-15 14:31:24 -08003537 /* If this changed underneath us, then we can't drop
3538 * it just yet. */
Sunil Mushran9b915182010-02-26 19:42:44 -08003539 mlog(ML_BASTS, "lockres %s, block=%d:%d, level=%d:%d, "
3540 "Recheck\n", lockres->l_name, blocking,
3541 lockres->l_blocking, level, lockres->l_level);
Mark Fashehccd979b2005-12-15 14:31:24 -08003542 goto recheck;
3543 }
3544
3545downconvert:
Mark Fashehd680efe2006-09-08 14:14:34 -07003546 ctl->requeue = 0;
Mark Fashehccd979b2005-12-15 14:31:24 -08003547
Mark Fasheh5ef0d4e2006-09-13 21:21:52 -07003548 if (lockres->l_ops->flags & LOCK_TYPE_USES_LVB) {
Joel Beckerbd3e7612008-02-01 12:14:57 -08003549 if (lockres->l_level == DLM_LOCK_EX)
Mark Fasheh5ef0d4e2006-09-13 21:21:52 -07003550 set_lvb = 1;
3551
3552 /*
3553 * We only set the lvb if the lock has been fully
3554 * refreshed - otherwise we risk setting stale
3555 * data. Otherwise, there's no need to actually clear
3556 * out the lvb here as it's value is still valid.
3557 */
3558 if (set_lvb && !(lockres->l_flags & OCFS2_LOCK_NEEDS_REFRESH))
3559 lockres->l_ops->set_lvb(lockres);
3560 }
3561
Joel Beckerde551242008-02-01 14:45:08 -08003562 gen = ocfs2_prepare_downconvert(lockres, new_level);
Mark Fashehccd979b2005-12-15 14:31:24 -08003563 spin_unlock_irqrestore(&lockres->l_lock, flags);
Joel Beckerde551242008-02-01 14:45:08 -08003564 ret = ocfs2_downconvert_lock(osb, lockres, new_level, set_lvb,
3565 gen);
3566
Mark Fashehccd979b2005-12-15 14:31:24 -08003567leave:
Tao Mac1e8d352011-03-07 16:43:21 +08003568 if (ret)
3569 mlog_errno(ret);
Mark Fashehccd979b2005-12-15 14:31:24 -08003570 return ret;
Mark Fashehf7fbfdd2006-09-13 21:02:29 -07003571
3572leave_requeue:
3573 spin_unlock_irqrestore(&lockres->l_lock, flags);
3574 ctl->requeue = 1;
3575
Mark Fashehf7fbfdd2006-09-13 21:02:29 -07003576 return 0;
Mark Fashehccd979b2005-12-15 14:31:24 -08003577}
3578
Mark Fashehd680efe2006-09-08 14:14:34 -07003579static int ocfs2_data_convert_worker(struct ocfs2_lock_res *lockres,
3580 int blocking)
Mark Fashehccd979b2005-12-15 14:31:24 -08003581{
3582 struct inode *inode;
3583 struct address_space *mapping;
Goldwyn Rodrigues5e98d492010-06-28 10:04:32 -05003584 struct ocfs2_inode_info *oi;
Mark Fashehccd979b2005-12-15 14:31:24 -08003585
Mark Fashehccd979b2005-12-15 14:31:24 -08003586 inode = ocfs2_lock_res_inode(lockres);
3587 mapping = inode->i_mapping;
3588
Goldwyn Rodrigues5e98d492010-06-28 10:04:32 -05003589 if (S_ISDIR(inode->i_mode)) {
3590 oi = OCFS2_I(inode);
3591 oi->ip_dir_lock_gen++;
3592 mlog(0, "generation: %u\n", oi->ip_dir_lock_gen);
3593 goto out;
3594 }
3595
Mark Fasheh1044e402008-02-28 17:16:03 -08003596 if (!S_ISREG(inode->i_mode))
Mark Fashehf1f54062007-10-18 15:13:59 -07003597 goto out;
3598
Mark Fasheh7f4a2a92006-12-11 11:06:36 -08003599 /*
3600 * We need this before the filemap_fdatawrite() so that it can
3601 * transfer the dirty bit from the PTE to the
3602 * page. Unfortunately this means that even for EX->PR
3603 * downconverts, we'll lose our mappings and have to build
3604 * them up again.
3605 */
3606 unmap_mapping_range(mapping, 0, 0, 0);
3607
Mark Fashehccd979b2005-12-15 14:31:24 -08003608 if (filemap_fdatawrite(mapping)) {
Mark Fashehb06970532006-03-03 10:24:33 -08003609 mlog(ML_ERROR, "Could not sync inode %llu for downconvert!",
3610 (unsigned long long)OCFS2_I(inode)->ip_blkno);
Mark Fashehccd979b2005-12-15 14:31:24 -08003611 }
3612 sync_mapping_buffers(mapping);
Joel Beckerbd3e7612008-02-01 12:14:57 -08003613 if (blocking == DLM_LOCK_EX) {
Mark Fashehccd979b2005-12-15 14:31:24 -08003614 truncate_inode_pages(mapping, 0);
Mark Fashehccd979b2005-12-15 14:31:24 -08003615 } else {
3616 /* We only need to wait on the I/O if we're not also
3617 * truncating pages because truncate_inode_pages waits
3618 * for us above. We don't truncate pages if we're
3619 * blocking anything < EXMODE because we want to keep
3620 * them around in that case. */
3621 filemap_fdatawait(mapping);
3622 }
3623
Mark Fashehf1f54062007-10-18 15:13:59 -07003624out:
Mark Fashehd680efe2006-09-08 14:14:34 -07003625 return UNBLOCK_CONTINUE;
Mark Fashehccd979b2005-12-15 14:31:24 -08003626}
3627
Tao Maa4338482009-08-18 11:19:29 +08003628static int ocfs2_ci_checkpointed(struct ocfs2_caching_info *ci,
3629 struct ocfs2_lock_res *lockres,
3630 int new_level)
Mark Fasheh810d5ae2006-09-13 21:39:52 -07003631{
Tao Maa4338482009-08-18 11:19:29 +08003632 int checkpointed = ocfs2_ci_fully_checkpointed(ci);
Mark Fasheh810d5ae2006-09-13 21:39:52 -07003633
Joel Beckerbd3e7612008-02-01 12:14:57 -08003634 BUG_ON(new_level != DLM_LOCK_NL && new_level != DLM_LOCK_PR);
3635 BUG_ON(lockres->l_level != DLM_LOCK_EX && !checkpointed);
Mark Fasheh810d5ae2006-09-13 21:39:52 -07003636
3637 if (checkpointed)
3638 return 1;
3639
Tao Maa4338482009-08-18 11:19:29 +08003640 ocfs2_start_checkpoint(OCFS2_SB(ocfs2_metadata_cache_get_super(ci)));
Mark Fasheh810d5ae2006-09-13 21:39:52 -07003641 return 0;
3642}
3643
Tao Maa4338482009-08-18 11:19:29 +08003644static int ocfs2_check_meta_downconvert(struct ocfs2_lock_res *lockres,
3645 int new_level)
3646{
3647 struct inode *inode = ocfs2_lock_res_inode(lockres);
3648
3649 return ocfs2_ci_checkpointed(INODE_CACHE(inode), lockres, new_level);
3650}
3651
Mark Fasheh810d5ae2006-09-13 21:39:52 -07003652static void ocfs2_set_meta_lvb(struct ocfs2_lock_res *lockres)
3653{
3654 struct inode *inode = ocfs2_lock_res_inode(lockres);
3655
3656 __ocfs2_stuff_meta_lvb(inode);
3657}
3658
Mark Fashehd680efe2006-09-08 14:14:34 -07003659/*
3660 * Does the final reference drop on our dentry lock. Right now this
Mark Fasheh34d024f2007-09-24 15:56:19 -07003661 * happens in the downconvert thread, but we could choose to simplify the
Mark Fashehd680efe2006-09-08 14:14:34 -07003662 * dlmglue API and push these off to the ocfs2_wq in the future.
3663 */
3664static void ocfs2_dentry_post_unlock(struct ocfs2_super *osb,
3665 struct ocfs2_lock_res *lockres)
3666{
3667 struct ocfs2_dentry_lock *dl = ocfs2_lock_res_dl(lockres);
3668 ocfs2_dentry_lock_put(osb, dl);
3669}
3670
3671/*
3672 * d_delete() matching dentries before the lock downconvert.
3673 *
3674 * At this point, any process waiting to destroy the
3675 * dentry_lock due to last ref count is stopped by the
3676 * OCFS2_LOCK_QUEUED flag.
3677 *
3678 * We have two potential problems
3679 *
3680 * 1) If we do the last reference drop on our dentry_lock (via dput)
3681 * we'll wind up in ocfs2_release_dentry_lock(), waiting on
3682 * the downconvert to finish. Instead we take an elevated
3683 * reference and push the drop until after we've completed our
3684 * unblock processing.
3685 *
3686 * 2) There might be another process with a final reference,
3687 * waiting on us to finish processing. If this is the case, we
3688 * detect it and exit out - there's no more dentries anyway.
3689 */
3690static int ocfs2_dentry_convert_worker(struct ocfs2_lock_res *lockres,
3691 int blocking)
3692{
3693 struct ocfs2_dentry_lock *dl = ocfs2_lock_res_dl(lockres);
3694 struct ocfs2_inode_info *oi = OCFS2_I(dl->dl_inode);
3695 struct dentry *dentry;
3696 unsigned long flags;
3697 int extra_ref = 0;
3698
3699 /*
3700 * This node is blocking another node from getting a read
3701 * lock. This happens when we've renamed within a
3702 * directory. We've forced the other nodes to d_delete(), but
3703 * we never actually dropped our lock because it's still
3704 * valid. The downconvert code will retain a PR for this node,
3705 * so there's no further work to do.
3706 */
Joel Beckerbd3e7612008-02-01 12:14:57 -08003707 if (blocking == DLM_LOCK_PR)
Mark Fashehd680efe2006-09-08 14:14:34 -07003708 return UNBLOCK_CONTINUE;
3709
3710 /*
3711 * Mark this inode as potentially orphaned. The code in
3712 * ocfs2_delete_inode() will figure out whether it actually
3713 * needs to be freed or not.
3714 */
3715 spin_lock(&oi->ip_lock);
3716 oi->ip_flags |= OCFS2_INODE_MAYBE_ORPHANED;
3717 spin_unlock(&oi->ip_lock);
3718
3719 /*
3720 * Yuck. We need to make sure however that the check of
3721 * OCFS2_LOCK_FREEING and the extra reference are atomic with
3722 * respect to a reference decrement or the setting of that
3723 * flag.
3724 */
3725 spin_lock_irqsave(&lockres->l_lock, flags);
3726 spin_lock(&dentry_attach_lock);
3727 if (!(lockres->l_flags & OCFS2_LOCK_FREEING)
3728 && dl->dl_count) {
3729 dl->dl_count++;
3730 extra_ref = 1;
3731 }
3732 spin_unlock(&dentry_attach_lock);
3733 spin_unlock_irqrestore(&lockres->l_lock, flags);
3734
3735 mlog(0, "extra_ref = %d\n", extra_ref);
3736
3737 /*
3738 * We have a process waiting on us in ocfs2_dentry_iput(),
3739 * which means we can't have any more outstanding
3740 * aliases. There's no need to do any more work.
3741 */
3742 if (!extra_ref)
3743 return UNBLOCK_CONTINUE;
3744
3745 spin_lock(&dentry_attach_lock);
3746 while (1) {
3747 dentry = ocfs2_find_local_alias(dl->dl_inode,
3748 dl->dl_parent_blkno, 1);
3749 if (!dentry)
3750 break;
3751 spin_unlock(&dentry_attach_lock);
3752
Al Viroa4555892014-10-21 20:11:25 -04003753 mlog(0, "d_delete(%pd);\n", dentry);
Mark Fashehd680efe2006-09-08 14:14:34 -07003754
3755 /*
3756 * The following dcache calls may do an
3757 * iput(). Normally we don't want that from the
3758 * downconverting thread, but in this case it's ok
3759 * because the requesting node already has an
3760 * exclusive lock on the inode, so it can't be queued
3761 * for a downconvert.
3762 */
3763 d_delete(dentry);
3764 dput(dentry);
3765
3766 spin_lock(&dentry_attach_lock);
3767 }
3768 spin_unlock(&dentry_attach_lock);
3769
3770 /*
3771 * If we are the last holder of this dentry lock, there is no
3772 * reason to downconvert so skip straight to the unlock.
3773 */
3774 if (dl->dl_count == 1)
3775 return UNBLOCK_STOP_POST;
3776
3777 return UNBLOCK_CONTINUE_POST;
3778}
3779
Tao Ma8dec98e2009-08-18 11:19:58 +08003780static int ocfs2_check_refcount_downconvert(struct ocfs2_lock_res *lockres,
3781 int new_level)
3782{
3783 struct ocfs2_refcount_tree *tree =
3784 ocfs2_lock_res_refcount_tree(lockres);
3785
3786 return ocfs2_ci_checkpointed(&tree->rf_ci, lockres, new_level);
3787}
3788
3789static int ocfs2_refcount_convert_worker(struct ocfs2_lock_res *lockres,
3790 int blocking)
3791{
3792 struct ocfs2_refcount_tree *tree =
3793 ocfs2_lock_res_refcount_tree(lockres);
3794
3795 ocfs2_metadata_cache_purge(&tree->rf_ci);
3796
3797 return UNBLOCK_CONTINUE;
3798}
3799
Jan Kara9e33d692008-08-25 19:56:50 +02003800static void ocfs2_set_qinfo_lvb(struct ocfs2_lock_res *lockres)
3801{
3802 struct ocfs2_qinfo_lvb *lvb;
3803 struct ocfs2_mem_dqinfo *oinfo = ocfs2_lock_res_qinfo(lockres);
3804 struct mem_dqinfo *info = sb_dqinfo(oinfo->dqi_gi.dqi_sb,
3805 oinfo->dqi_gi.dqi_type);
3806
Mark Fasheha641dc22008-12-24 16:03:48 -08003807 lvb = ocfs2_dlm_lvb(&lockres->l_lksb);
Jan Kara9e33d692008-08-25 19:56:50 +02003808 lvb->lvb_version = OCFS2_QINFO_LVB_VERSION;
3809 lvb->lvb_bgrace = cpu_to_be32(info->dqi_bgrace);
3810 lvb->lvb_igrace = cpu_to_be32(info->dqi_igrace);
3811 lvb->lvb_syncms = cpu_to_be32(oinfo->dqi_syncms);
3812 lvb->lvb_blocks = cpu_to_be32(oinfo->dqi_gi.dqi_blocks);
3813 lvb->lvb_free_blk = cpu_to_be32(oinfo->dqi_gi.dqi_free_blk);
3814 lvb->lvb_free_entry = cpu_to_be32(oinfo->dqi_gi.dqi_free_entry);
Jan Kara9e33d692008-08-25 19:56:50 +02003815}
3816
3817void ocfs2_qinfo_unlock(struct ocfs2_mem_dqinfo *oinfo, int ex)
3818{
3819 struct ocfs2_lock_res *lockres = &oinfo->dqi_gqlock;
3820 struct ocfs2_super *osb = OCFS2_SB(oinfo->dqi_gi.dqi_sb);
3821 int level = ex ? DLM_LOCK_EX : DLM_LOCK_PR;
3822
Jan Kara9e33d692008-08-25 19:56:50 +02003823 if (!ocfs2_is_hard_readonly(osb) && !ocfs2_mount_local(osb))
3824 ocfs2_cluster_unlock(osb, lockres, level);
Jan Kara9e33d692008-08-25 19:56:50 +02003825}
3826
3827static int ocfs2_refresh_qinfo(struct ocfs2_mem_dqinfo *oinfo)
3828{
3829 struct mem_dqinfo *info = sb_dqinfo(oinfo->dqi_gi.dqi_sb,
3830 oinfo->dqi_gi.dqi_type);
3831 struct ocfs2_lock_res *lockres = &oinfo->dqi_gqlock;
3832 struct ocfs2_qinfo_lvb *lvb = ocfs2_dlm_lvb(&lockres->l_lksb);
Joel Becker85eb8b72008-11-25 15:31:27 +01003833 struct buffer_head *bh = NULL;
Jan Kara9e33d692008-08-25 19:56:50 +02003834 struct ocfs2_global_disk_dqinfo *gdinfo;
3835 int status = 0;
3836
Joel Becker1c520df2009-06-19 15:14:13 -07003837 if (ocfs2_dlm_lvb_valid(&lockres->l_lksb) &&
3838 lvb->lvb_version == OCFS2_QINFO_LVB_VERSION) {
Jan Kara9e33d692008-08-25 19:56:50 +02003839 info->dqi_bgrace = be32_to_cpu(lvb->lvb_bgrace);
3840 info->dqi_igrace = be32_to_cpu(lvb->lvb_igrace);
3841 oinfo->dqi_syncms = be32_to_cpu(lvb->lvb_syncms);
3842 oinfo->dqi_gi.dqi_blocks = be32_to_cpu(lvb->lvb_blocks);
3843 oinfo->dqi_gi.dqi_free_blk = be32_to_cpu(lvb->lvb_free_blk);
3844 oinfo->dqi_gi.dqi_free_entry =
3845 be32_to_cpu(lvb->lvb_free_entry);
3846 } else {
Jan Karaae4f6ef2010-04-28 19:04:29 +02003847 status = ocfs2_read_quota_phys_block(oinfo->dqi_gqinode,
3848 oinfo->dqi_giblk, &bh);
Joel Becker85eb8b72008-11-25 15:31:27 +01003849 if (status) {
Jan Kara9e33d692008-08-25 19:56:50 +02003850 mlog_errno(status);
3851 goto bail;
3852 }
3853 gdinfo = (struct ocfs2_global_disk_dqinfo *)
3854 (bh->b_data + OCFS2_GLOBAL_INFO_OFF);
3855 info->dqi_bgrace = le32_to_cpu(gdinfo->dqi_bgrace);
3856 info->dqi_igrace = le32_to_cpu(gdinfo->dqi_igrace);
3857 oinfo->dqi_syncms = le32_to_cpu(gdinfo->dqi_syncms);
3858 oinfo->dqi_gi.dqi_blocks = le32_to_cpu(gdinfo->dqi_blocks);
3859 oinfo->dqi_gi.dqi_free_blk = le32_to_cpu(gdinfo->dqi_free_blk);
3860 oinfo->dqi_gi.dqi_free_entry =
3861 le32_to_cpu(gdinfo->dqi_free_entry);
3862 brelse(bh);
3863 ocfs2_track_lock_refresh(lockres);
3864 }
3865
3866bail:
3867 return status;
3868}
3869
3870/* Lock quota info, this function expects at least shared lock on the quota file
3871 * so that we can safely refresh quota info from disk. */
3872int ocfs2_qinfo_lock(struct ocfs2_mem_dqinfo *oinfo, int ex)
3873{
3874 struct ocfs2_lock_res *lockres = &oinfo->dqi_gqlock;
3875 struct ocfs2_super *osb = OCFS2_SB(oinfo->dqi_gi.dqi_sb);
3876 int level = ex ? DLM_LOCK_EX : DLM_LOCK_PR;
3877 int status = 0;
3878
Jan Kara9e33d692008-08-25 19:56:50 +02003879 /* On RO devices, locking really isn't needed... */
3880 if (ocfs2_is_hard_readonly(osb)) {
3881 if (ex)
3882 status = -EROFS;
3883 goto bail;
3884 }
3885 if (ocfs2_mount_local(osb))
3886 goto bail;
3887
3888 status = ocfs2_cluster_lock(osb, lockres, level, 0, 0);
3889 if (status < 0) {
3890 mlog_errno(status);
3891 goto bail;
3892 }
3893 if (!ocfs2_should_refresh_lock_res(lockres))
3894 goto bail;
3895 /* OK, we have the lock but we need to refresh the quota info */
3896 status = ocfs2_refresh_qinfo(oinfo);
3897 if (status)
3898 ocfs2_qinfo_unlock(oinfo, ex);
3899 ocfs2_complete_lock_res_refresh(lockres, status);
3900bail:
Jan Kara9e33d692008-08-25 19:56:50 +02003901 return status;
3902}
3903
Tao Ma8dec98e2009-08-18 11:19:58 +08003904int ocfs2_refcount_lock(struct ocfs2_refcount_tree *ref_tree, int ex)
3905{
3906 int status;
3907 int level = ex ? DLM_LOCK_EX : DLM_LOCK_PR;
3908 struct ocfs2_lock_res *lockres = &ref_tree->rf_lockres;
3909 struct ocfs2_super *osb = lockres->l_priv;
3910
3911
3912 if (ocfs2_is_hard_readonly(osb))
3913 return -EROFS;
3914
3915 if (ocfs2_mount_local(osb))
3916 return 0;
3917
3918 status = ocfs2_cluster_lock(osb, lockres, level, 0, 0);
3919 if (status < 0)
3920 mlog_errno(status);
3921
3922 return status;
3923}
3924
3925void ocfs2_refcount_unlock(struct ocfs2_refcount_tree *ref_tree, int ex)
3926{
3927 int level = ex ? DLM_LOCK_EX : DLM_LOCK_PR;
3928 struct ocfs2_lock_res *lockres = &ref_tree->rf_lockres;
3929 struct ocfs2_super *osb = lockres->l_priv;
3930
3931 if (!ocfs2_mount_local(osb))
3932 ocfs2_cluster_unlock(osb, lockres, level);
3933}
3934
Adrian Bunk00600052008-01-29 00:11:41 +02003935static void ocfs2_process_blocked_lock(struct ocfs2_super *osb,
3936 struct ocfs2_lock_res *lockres)
Mark Fashehccd979b2005-12-15 14:31:24 -08003937{
3938 int status;
Mark Fashehd680efe2006-09-08 14:14:34 -07003939 struct ocfs2_unblock_ctl ctl = {0, 0,};
Mark Fashehccd979b2005-12-15 14:31:24 -08003940 unsigned long flags;
3941
3942 /* Our reference to the lockres in this function can be
3943 * considered valid until we remove the OCFS2_LOCK_QUEUED
3944 * flag. */
3945
Mark Fashehccd979b2005-12-15 14:31:24 -08003946 BUG_ON(!lockres);
3947 BUG_ON(!lockres->l_ops);
Mark Fashehccd979b2005-12-15 14:31:24 -08003948
Sunil Mushran9b915182010-02-26 19:42:44 -08003949 mlog(ML_BASTS, "lockres %s blocked\n", lockres->l_name);
Mark Fashehccd979b2005-12-15 14:31:24 -08003950
3951 /* Detect whether a lock has been marked as going away while
Mark Fasheh34d024f2007-09-24 15:56:19 -07003952 * the downconvert thread was processing other things. A lock can
Mark Fashehccd979b2005-12-15 14:31:24 -08003953 * still be marked with OCFS2_LOCK_FREEING after this check,
3954 * but short circuiting here will still save us some
3955 * performance. */
3956 spin_lock_irqsave(&lockres->l_lock, flags);
3957 if (lockres->l_flags & OCFS2_LOCK_FREEING)
3958 goto unqueue;
3959 spin_unlock_irqrestore(&lockres->l_lock, flags);
3960
Mark Fashehb5e500e2006-09-13 22:01:16 -07003961 status = ocfs2_unblock_lock(osb, lockres, &ctl);
Mark Fashehccd979b2005-12-15 14:31:24 -08003962 if (status < 0)
3963 mlog_errno(status);
3964
3965 spin_lock_irqsave(&lockres->l_lock, flags);
3966unqueue:
Mark Fashehd680efe2006-09-08 14:14:34 -07003967 if (lockres->l_flags & OCFS2_LOCK_FREEING || !ctl.requeue) {
Mark Fashehccd979b2005-12-15 14:31:24 -08003968 lockres_clear_flags(lockres, OCFS2_LOCK_QUEUED);
3969 } else
3970 ocfs2_schedule_blocked_lock(osb, lockres);
3971
Sunil Mushran9b915182010-02-26 19:42:44 -08003972 mlog(ML_BASTS, "lockres %s, requeue = %s.\n", lockres->l_name,
Mark Fashehd680efe2006-09-08 14:14:34 -07003973 ctl.requeue ? "yes" : "no");
Mark Fashehccd979b2005-12-15 14:31:24 -08003974 spin_unlock_irqrestore(&lockres->l_lock, flags);
3975
Mark Fashehd680efe2006-09-08 14:14:34 -07003976 if (ctl.unblock_action != UNBLOCK_CONTINUE
3977 && lockres->l_ops->post_unlock)
3978 lockres->l_ops->post_unlock(osb, lockres);
Mark Fashehccd979b2005-12-15 14:31:24 -08003979}
3980
3981static void ocfs2_schedule_blocked_lock(struct ocfs2_super *osb,
3982 struct ocfs2_lock_res *lockres)
3983{
Srinivas Eedaa75e9cc2012-01-30 21:51:22 -08003984 unsigned long flags;
3985
Mark Fashehccd979b2005-12-15 14:31:24 -08003986 assert_spin_locked(&lockres->l_lock);
3987
3988 if (lockres->l_flags & OCFS2_LOCK_FREEING) {
3989 /* Do not schedule a lock for downconvert when it's on
3990 * the way to destruction - any nodes wanting access
3991 * to the resource will get it soon. */
Sunil Mushran9b915182010-02-26 19:42:44 -08003992 mlog(ML_BASTS, "lockres %s won't be scheduled: flags 0x%lx\n",
Mark Fashehccd979b2005-12-15 14:31:24 -08003993 lockres->l_name, lockres->l_flags);
3994 return;
3995 }
3996
3997 lockres_or_flags(lockres, OCFS2_LOCK_QUEUED);
3998
Srinivas Eedaa75e9cc2012-01-30 21:51:22 -08003999 spin_lock_irqsave(&osb->dc_task_lock, flags);
Mark Fashehccd979b2005-12-15 14:31:24 -08004000 if (list_empty(&lockres->l_blocked_list)) {
4001 list_add_tail(&lockres->l_blocked_list,
4002 &osb->blocked_lock_list);
4003 osb->blocked_lock_count++;
4004 }
Srinivas Eedaa75e9cc2012-01-30 21:51:22 -08004005 spin_unlock_irqrestore(&osb->dc_task_lock, flags);
Mark Fashehccd979b2005-12-15 14:31:24 -08004006}
Mark Fasheh34d024f2007-09-24 15:56:19 -07004007
4008static void ocfs2_downconvert_thread_do_work(struct ocfs2_super *osb)
4009{
4010 unsigned long processed;
Srinivas Eedaa75e9cc2012-01-30 21:51:22 -08004011 unsigned long flags;
Mark Fasheh34d024f2007-09-24 15:56:19 -07004012 struct ocfs2_lock_res *lockres;
4013
Srinivas Eedaa75e9cc2012-01-30 21:51:22 -08004014 spin_lock_irqsave(&osb->dc_task_lock, flags);
Mark Fasheh34d024f2007-09-24 15:56:19 -07004015 /* grab this early so we know to try again if a state change and
4016 * wake happens part-way through our work */
4017 osb->dc_work_sequence = osb->dc_wake_sequence;
4018
4019 processed = osb->blocked_lock_count;
4020 while (processed) {
4021 BUG_ON(list_empty(&osb->blocked_lock_list));
4022
4023 lockres = list_entry(osb->blocked_lock_list.next,
4024 struct ocfs2_lock_res, l_blocked_list);
4025 list_del_init(&lockres->l_blocked_list);
4026 osb->blocked_lock_count--;
Srinivas Eedaa75e9cc2012-01-30 21:51:22 -08004027 spin_unlock_irqrestore(&osb->dc_task_lock, flags);
Mark Fasheh34d024f2007-09-24 15:56:19 -07004028
4029 BUG_ON(!processed);
4030 processed--;
4031
4032 ocfs2_process_blocked_lock(osb, lockres);
4033
Srinivas Eedaa75e9cc2012-01-30 21:51:22 -08004034 spin_lock_irqsave(&osb->dc_task_lock, flags);
Mark Fasheh34d024f2007-09-24 15:56:19 -07004035 }
Srinivas Eedaa75e9cc2012-01-30 21:51:22 -08004036 spin_unlock_irqrestore(&osb->dc_task_lock, flags);
Mark Fasheh34d024f2007-09-24 15:56:19 -07004037}
4038
4039static int ocfs2_downconvert_thread_lists_empty(struct ocfs2_super *osb)
4040{
4041 int empty = 0;
Srinivas Eedaa75e9cc2012-01-30 21:51:22 -08004042 unsigned long flags;
Mark Fasheh34d024f2007-09-24 15:56:19 -07004043
Srinivas Eedaa75e9cc2012-01-30 21:51:22 -08004044 spin_lock_irqsave(&osb->dc_task_lock, flags);
Mark Fasheh34d024f2007-09-24 15:56:19 -07004045 if (list_empty(&osb->blocked_lock_list))
4046 empty = 1;
4047
Srinivas Eedaa75e9cc2012-01-30 21:51:22 -08004048 spin_unlock_irqrestore(&osb->dc_task_lock, flags);
Mark Fasheh34d024f2007-09-24 15:56:19 -07004049 return empty;
4050}
4051
4052static int ocfs2_downconvert_thread_should_wake(struct ocfs2_super *osb)
4053{
4054 int should_wake = 0;
Srinivas Eedaa75e9cc2012-01-30 21:51:22 -08004055 unsigned long flags;
Mark Fasheh34d024f2007-09-24 15:56:19 -07004056
Srinivas Eedaa75e9cc2012-01-30 21:51:22 -08004057 spin_lock_irqsave(&osb->dc_task_lock, flags);
Mark Fasheh34d024f2007-09-24 15:56:19 -07004058 if (osb->dc_work_sequence != osb->dc_wake_sequence)
4059 should_wake = 1;
Srinivas Eedaa75e9cc2012-01-30 21:51:22 -08004060 spin_unlock_irqrestore(&osb->dc_task_lock, flags);
Mark Fasheh34d024f2007-09-24 15:56:19 -07004061
4062 return should_wake;
4063}
4064
Adrian Bunk200bfae2008-02-17 10:20:38 +02004065static int ocfs2_downconvert_thread(void *arg)
Mark Fasheh34d024f2007-09-24 15:56:19 -07004066{
4067 int status = 0;
4068 struct ocfs2_super *osb = arg;
4069
4070 /* only quit once we've been asked to stop and there is no more
4071 * work available */
4072 while (!(kthread_should_stop() &&
4073 ocfs2_downconvert_thread_lists_empty(osb))) {
4074
4075 wait_event_interruptible(osb->dc_event,
4076 ocfs2_downconvert_thread_should_wake(osb) ||
4077 kthread_should_stop());
4078
4079 mlog(0, "downconvert_thread: awoken\n");
4080
4081 ocfs2_downconvert_thread_do_work(osb);
4082 }
4083
4084 osb->dc_task = NULL;
4085 return status;
4086}
4087
4088void ocfs2_wake_downconvert_thread(struct ocfs2_super *osb)
4089{
Srinivas Eedaa75e9cc2012-01-30 21:51:22 -08004090 unsigned long flags;
4091
4092 spin_lock_irqsave(&osb->dc_task_lock, flags);
Mark Fasheh34d024f2007-09-24 15:56:19 -07004093 /* make sure the voting thread gets a swipe at whatever changes
4094 * the caller may have made to the voting state */
4095 osb->dc_wake_sequence++;
Srinivas Eedaa75e9cc2012-01-30 21:51:22 -08004096 spin_unlock_irqrestore(&osb->dc_task_lock, flags);
Mark Fasheh34d024f2007-09-24 15:56:19 -07004097 wake_up(&osb->dc_event);
4098}