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ccd979bd MF |
1 | /* -*- 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> | |
ccd979bd MF |
30 | #include <linux/kthread.h> |
31 | #include <linux/pagemap.h> | |
32 | #include <linux/debugfs.h> | |
33 | #include <linux/seq_file.h> | |
8ddb7b00 | 34 | #include <linux/time.h> |
9e33d69f | 35 | #include <linux/quotaops.h> |
174cd4b1 | 36 | #include <linux/sched/signal.h> |
ccd979bd | 37 | |
ccd979bd MF |
38 | #define MLOG_MASK_PREFIX ML_DLM_GLUE |
39 | #include <cluster/masklog.h> | |
40 | ||
41 | #include "ocfs2.h" | |
d24fbcda | 42 | #include "ocfs2_lockingver.h" |
ccd979bd MF |
43 | |
44 | #include "alloc.h" | |
d680efe9 | 45 | #include "dcache.h" |
ccd979bd MF |
46 | #include "dlmglue.h" |
47 | #include "extent_map.h" | |
7f1a37e3 | 48 | #include "file.h" |
ccd979bd MF |
49 | #include "heartbeat.h" |
50 | #include "inode.h" | |
51 | #include "journal.h" | |
24ef1815 | 52 | #include "stackglue.h" |
ccd979bd MF |
53 | #include "slot_map.h" |
54 | #include "super.h" | |
55 | #include "uptodate.h" | |
9e33d69f | 56 | #include "quota.h" |
8dec98ed | 57 | #include "refcounttree.h" |
b8a7a3a6 | 58 | #include "acl.h" |
ccd979bd MF |
59 | |
60 | #include "buffer_head_io.h" | |
61 | ||
62 | struct ocfs2_mask_waiter { | |
63 | struct list_head mw_item; | |
64 | int mw_status; | |
65 | struct completion mw_complete; | |
66 | unsigned long mw_mask; | |
67 | unsigned long mw_goal; | |
8ddb7b00 | 68 | #ifdef CONFIG_OCFS2_FS_STATS |
5bc970e8 | 69 | ktime_t mw_lock_start; |
8ddb7b00 | 70 | #endif |
ccd979bd MF |
71 | }; |
72 | ||
54a7e755 MF |
73 | static struct ocfs2_super *ocfs2_get_dentry_osb(struct ocfs2_lock_res *lockres); |
74 | static struct ocfs2_super *ocfs2_get_inode_osb(struct ocfs2_lock_res *lockres); | |
cf8e06f1 | 75 | static struct ocfs2_super *ocfs2_get_file_osb(struct ocfs2_lock_res *lockres); |
9e33d69f | 76 | static struct ocfs2_super *ocfs2_get_qinfo_osb(struct ocfs2_lock_res *lockres); |
ccd979bd | 77 | |
d680efe9 | 78 | /* |
cc567d89 | 79 | * Return value from ->downconvert_worker functions. |
d680efe9 | 80 | * |
b5e500e2 | 81 | * These control the precise actions of ocfs2_unblock_lock() |
d680efe9 MF |
82 | * and ocfs2_process_blocked_lock() |
83 | * | |
84 | */ | |
85 | enum ocfs2_unblock_action { | |
86 | UNBLOCK_CONTINUE = 0, /* Continue downconvert */ | |
87 | UNBLOCK_CONTINUE_POST = 1, /* Continue downconvert, fire | |
88 | * ->post_unlock callback */ | |
89 | UNBLOCK_STOP_POST = 2, /* Do not downconvert, fire | |
90 | * ->post_unlock() callback. */ | |
91 | }; | |
92 | ||
93 | struct ocfs2_unblock_ctl { | |
94 | int requeue; | |
95 | enum ocfs2_unblock_action unblock_action; | |
96 | }; | |
97 | ||
cb25797d | 98 | /* Lockdep class keys */ |
1cff514a | 99 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
480bd564 | 100 | static struct lock_class_key lockdep_keys[OCFS2_NUM_LOCK_TYPES]; |
1cff514a | 101 | #endif |
cb25797d | 102 | |
810d5aeb MF |
103 | static int ocfs2_check_meta_downconvert(struct ocfs2_lock_res *lockres, |
104 | int new_level); | |
105 | static void ocfs2_set_meta_lvb(struct ocfs2_lock_res *lockres); | |
106 | ||
cc567d89 MF |
107 | static int ocfs2_data_convert_worker(struct ocfs2_lock_res *lockres, |
108 | int blocking); | |
109 | ||
cc567d89 MF |
110 | static int ocfs2_dentry_convert_worker(struct ocfs2_lock_res *lockres, |
111 | int blocking); | |
d680efe9 MF |
112 | |
113 | static void ocfs2_dentry_post_unlock(struct ocfs2_super *osb, | |
114 | struct ocfs2_lock_res *lockres); | |
ccd979bd | 115 | |
9e33d69f | 116 | static void ocfs2_set_qinfo_lvb(struct ocfs2_lock_res *lockres); |
6cb129f5 | 117 | |
8dec98ed TM |
118 | static int ocfs2_check_refcount_downconvert(struct ocfs2_lock_res *lockres, |
119 | int new_level); | |
120 | static int ocfs2_refcount_convert_worker(struct ocfs2_lock_res *lockres, | |
121 | int blocking); | |
122 | ||
6cb129f5 AB |
123 | #define mlog_meta_lvb(__level, __lockres) ocfs2_dump_meta_lvb_info(__level, __PRETTY_FUNCTION__, __LINE__, __lockres) |
124 | ||
125 | /* This aids in debugging situations where a bad LVB might be involved. */ | |
126 | static void ocfs2_dump_meta_lvb_info(u64 level, | |
127 | const char *function, | |
128 | unsigned int line, | |
129 | struct ocfs2_lock_res *lockres) | |
130 | { | |
a641dc2a | 131 | struct ocfs2_meta_lvb *lvb = ocfs2_dlm_lvb(&lockres->l_lksb); |
6cb129f5 AB |
132 | |
133 | mlog(level, "LVB information for %s (called from %s:%u):\n", | |
134 | lockres->l_name, function, line); | |
135 | mlog(level, "version: %u, clusters: %u, generation: 0x%x\n", | |
136 | lvb->lvb_version, be32_to_cpu(lvb->lvb_iclusters), | |
137 | be32_to_cpu(lvb->lvb_igeneration)); | |
138 | mlog(level, "size: %llu, uid %u, gid %u, mode 0x%x\n", | |
139 | (unsigned long long)be64_to_cpu(lvb->lvb_isize), | |
140 | be32_to_cpu(lvb->lvb_iuid), be32_to_cpu(lvb->lvb_igid), | |
141 | be16_to_cpu(lvb->lvb_imode)); | |
142 | mlog(level, "nlink %u, atime_packed 0x%llx, ctime_packed 0x%llx, " | |
143 | "mtime_packed 0x%llx iattr 0x%x\n", be16_to_cpu(lvb->lvb_inlink), | |
144 | (long long)be64_to_cpu(lvb->lvb_iatime_packed), | |
145 | (long long)be64_to_cpu(lvb->lvb_ictime_packed), | |
146 | (long long)be64_to_cpu(lvb->lvb_imtime_packed), | |
147 | be32_to_cpu(lvb->lvb_iattr)); | |
148 | } | |
149 | ||
150 | ||
f625c979 MF |
151 | /* |
152 | * OCFS2 Lock Resource Operations | |
153 | * | |
154 | * These fine tune the behavior of the generic dlmglue locking infrastructure. | |
0d5dc6c2 MF |
155 | * |
156 | * The most basic of lock types can point ->l_priv to their respective | |
157 | * struct ocfs2_super and allow the default actions to manage things. | |
158 | * | |
159 | * Right now, each lock type also needs to implement an init function, | |
160 | * and trivial lock/unlock wrappers. ocfs2_simple_drop_lockres() | |
161 | * should be called when the lock is no longer needed (i.e., object | |
162 | * destruction time). | |
f625c979 | 163 | */ |
ccd979bd | 164 | struct ocfs2_lock_res_ops { |
54a7e755 MF |
165 | /* |
166 | * Translate an ocfs2_lock_res * into an ocfs2_super *. Define | |
167 | * this callback if ->l_priv is not an ocfs2_super pointer | |
168 | */ | |
169 | struct ocfs2_super * (*get_osb)(struct ocfs2_lock_res *); | |
b5e500e2 | 170 | |
0d5dc6c2 | 171 | /* |
34d024f8 MF |
172 | * Optionally called in the downconvert thread after a |
173 | * successful downconvert. The lockres will not be referenced | |
174 | * after this callback is called, so it is safe to free | |
175 | * memory, etc. | |
0d5dc6c2 MF |
176 | * |
177 | * The exact semantics of when this is called are controlled | |
178 | * by ->downconvert_worker() | |
179 | */ | |
d680efe9 | 180 | void (*post_unlock)(struct ocfs2_super *, struct ocfs2_lock_res *); |
f625c979 | 181 | |
16d5b956 MF |
182 | /* |
183 | * Allow a lock type to add checks to determine whether it is | |
184 | * safe to downconvert a lock. Return 0 to re-queue the | |
185 | * downconvert at a later time, nonzero to continue. | |
186 | * | |
187 | * For most locks, the default checks that there are no | |
188 | * incompatible holders are sufficient. | |
189 | * | |
190 | * Called with the lockres spinlock held. | |
191 | */ | |
192 | int (*check_downconvert)(struct ocfs2_lock_res *, int); | |
193 | ||
5ef0d4ea MF |
194 | /* |
195 | * Allows a lock type to populate the lock value block. This | |
196 | * is called on downconvert, and when we drop a lock. | |
197 | * | |
198 | * Locks that want to use this should set LOCK_TYPE_USES_LVB | |
199 | * in the flags field. | |
200 | * | |
201 | * Called with the lockres spinlock held. | |
202 | */ | |
203 | void (*set_lvb)(struct ocfs2_lock_res *); | |
204 | ||
cc567d89 MF |
205 | /* |
206 | * Called from the downconvert thread when it is determined | |
207 | * that a lock will be downconverted. This is called without | |
208 | * any locks held so the function can do work that might | |
209 | * schedule (syncing out data, etc). | |
210 | * | |
211 | * This should return any one of the ocfs2_unblock_action | |
212 | * values, depending on what it wants the thread to do. | |
213 | */ | |
214 | int (*downconvert_worker)(struct ocfs2_lock_res *, int); | |
215 | ||
f625c979 MF |
216 | /* |
217 | * LOCK_TYPE_* flags which describe the specific requirements | |
218 | * of a lock type. Descriptions of each individual flag follow. | |
219 | */ | |
220 | int flags; | |
ccd979bd MF |
221 | }; |
222 | ||
f625c979 MF |
223 | /* |
224 | * Some locks want to "refresh" potentially stale data when a | |
225 | * meaningful (PRMODE or EXMODE) lock level is first obtained. If this | |
226 | * flag is set, the OCFS2_LOCK_NEEDS_REFRESH flag will be set on the | |
227 | * individual lockres l_flags member from the ast function. It is | |
228 | * expected that the locking wrapper will clear the | |
229 | * OCFS2_LOCK_NEEDS_REFRESH flag when done. | |
230 | */ | |
231 | #define LOCK_TYPE_REQUIRES_REFRESH 0x1 | |
232 | ||
b80fc012 | 233 | /* |
5ef0d4ea MF |
234 | * Indicate that a lock type makes use of the lock value block. The |
235 | * ->set_lvb lock type callback must be defined. | |
b80fc012 MF |
236 | */ |
237 | #define LOCK_TYPE_USES_LVB 0x2 | |
238 | ||
ccd979bd | 239 | static struct ocfs2_lock_res_ops ocfs2_inode_rw_lops = { |
54a7e755 | 240 | .get_osb = ocfs2_get_inode_osb, |
f625c979 | 241 | .flags = 0, |
ccd979bd MF |
242 | }; |
243 | ||
e63aecb6 | 244 | static struct ocfs2_lock_res_ops ocfs2_inode_inode_lops = { |
54a7e755 | 245 | .get_osb = ocfs2_get_inode_osb, |
810d5aeb MF |
246 | .check_downconvert = ocfs2_check_meta_downconvert, |
247 | .set_lvb = ocfs2_set_meta_lvb, | |
f1f54068 | 248 | .downconvert_worker = ocfs2_data_convert_worker, |
b80fc012 | 249 | .flags = LOCK_TYPE_REQUIRES_REFRESH|LOCK_TYPE_USES_LVB, |
ccd979bd MF |
250 | }; |
251 | ||
ccd979bd | 252 | static struct ocfs2_lock_res_ops ocfs2_super_lops = { |
f625c979 | 253 | .flags = LOCK_TYPE_REQUIRES_REFRESH, |
ccd979bd MF |
254 | }; |
255 | ||
256 | static struct ocfs2_lock_res_ops ocfs2_rename_lops = { | |
f625c979 | 257 | .flags = 0, |
ccd979bd MF |
258 | }; |
259 | ||
6ca497a8 | 260 | static struct ocfs2_lock_res_ops ocfs2_nfs_sync_lops = { |
261 | .flags = 0, | |
262 | }; | |
263 | ||
4882abeb GH |
264 | static struct ocfs2_lock_res_ops ocfs2_trim_fs_lops = { |
265 | .flags = LOCK_TYPE_REQUIRES_REFRESH|LOCK_TYPE_USES_LVB, | |
266 | }; | |
267 | ||
83273932 SE |
268 | static struct ocfs2_lock_res_ops ocfs2_orphan_scan_lops = { |
269 | .flags = LOCK_TYPE_REQUIRES_REFRESH|LOCK_TYPE_USES_LVB, | |
270 | }; | |
271 | ||
d680efe9 | 272 | static struct ocfs2_lock_res_ops ocfs2_dentry_lops = { |
54a7e755 | 273 | .get_osb = ocfs2_get_dentry_osb, |
d680efe9 | 274 | .post_unlock = ocfs2_dentry_post_unlock, |
cc567d89 | 275 | .downconvert_worker = ocfs2_dentry_convert_worker, |
f625c979 | 276 | .flags = 0, |
d680efe9 MF |
277 | }; |
278 | ||
50008630 TY |
279 | static struct ocfs2_lock_res_ops ocfs2_inode_open_lops = { |
280 | .get_osb = ocfs2_get_inode_osb, | |
281 | .flags = 0, | |
282 | }; | |
283 | ||
cf8e06f1 MF |
284 | static struct ocfs2_lock_res_ops ocfs2_flock_lops = { |
285 | .get_osb = ocfs2_get_file_osb, | |
286 | .flags = 0, | |
287 | }; | |
288 | ||
9e33d69f JK |
289 | static struct ocfs2_lock_res_ops ocfs2_qinfo_lops = { |
290 | .set_lvb = ocfs2_set_qinfo_lvb, | |
291 | .get_osb = ocfs2_get_qinfo_osb, | |
292 | .flags = LOCK_TYPE_REQUIRES_REFRESH | LOCK_TYPE_USES_LVB, | |
293 | }; | |
294 | ||
8dec98ed TM |
295 | static struct ocfs2_lock_res_ops ocfs2_refcount_block_lops = { |
296 | .check_downconvert = ocfs2_check_refcount_downconvert, | |
297 | .downconvert_worker = ocfs2_refcount_convert_worker, | |
298 | .flags = 0, | |
299 | }; | |
300 | ||
ccd979bd MF |
301 | static inline int ocfs2_is_inode_lock(struct ocfs2_lock_res *lockres) |
302 | { | |
303 | return lockres->l_type == OCFS2_LOCK_TYPE_META || | |
50008630 TY |
304 | lockres->l_type == OCFS2_LOCK_TYPE_RW || |
305 | lockres->l_type == OCFS2_LOCK_TYPE_OPEN; | |
ccd979bd MF |
306 | } |
307 | ||
c0e41338 | 308 | static inline struct ocfs2_lock_res *ocfs2_lksb_to_lock_res(struct ocfs2_dlm_lksb *lksb) |
a796d286 JB |
309 | { |
310 | return container_of(lksb, struct ocfs2_lock_res, l_lksb); | |
311 | } | |
312 | ||
ccd979bd MF |
313 | static inline struct inode *ocfs2_lock_res_inode(struct ocfs2_lock_res *lockres) |
314 | { | |
315 | BUG_ON(!ocfs2_is_inode_lock(lockres)); | |
316 | ||
317 | return (struct inode *) lockres->l_priv; | |
318 | } | |
319 | ||
d680efe9 MF |
320 | static inline struct ocfs2_dentry_lock *ocfs2_lock_res_dl(struct ocfs2_lock_res *lockres) |
321 | { | |
322 | BUG_ON(lockres->l_type != OCFS2_LOCK_TYPE_DENTRY); | |
323 | ||
324 | return (struct ocfs2_dentry_lock *)lockres->l_priv; | |
325 | } | |
326 | ||
9e33d69f JK |
327 | static inline struct ocfs2_mem_dqinfo *ocfs2_lock_res_qinfo(struct ocfs2_lock_res *lockres) |
328 | { | |
329 | BUG_ON(lockres->l_type != OCFS2_LOCK_TYPE_QINFO); | |
330 | ||
331 | return (struct ocfs2_mem_dqinfo *)lockres->l_priv; | |
332 | } | |
333 | ||
8dec98ed TM |
334 | static inline struct ocfs2_refcount_tree * |
335 | ocfs2_lock_res_refcount_tree(struct ocfs2_lock_res *res) | |
336 | { | |
337 | return container_of(res, struct ocfs2_refcount_tree, rf_lockres); | |
338 | } | |
339 | ||
54a7e755 MF |
340 | static inline struct ocfs2_super *ocfs2_get_lockres_osb(struct ocfs2_lock_res *lockres) |
341 | { | |
342 | if (lockres->l_ops->get_osb) | |
343 | return lockres->l_ops->get_osb(lockres); | |
344 | ||
345 | return (struct ocfs2_super *)lockres->l_priv; | |
346 | } | |
347 | ||
ccd979bd MF |
348 | static int ocfs2_lock_create(struct ocfs2_super *osb, |
349 | struct ocfs2_lock_res *lockres, | |
350 | int level, | |
bd3e7610 | 351 | u32 dlm_flags); |
ccd979bd MF |
352 | static inline int ocfs2_may_continue_on_blocked_lock(struct ocfs2_lock_res *lockres, |
353 | int wanted); | |
cb25797d JK |
354 | static void __ocfs2_cluster_unlock(struct ocfs2_super *osb, |
355 | struct ocfs2_lock_res *lockres, | |
356 | int level, unsigned long caller_ip); | |
357 | static inline void ocfs2_cluster_unlock(struct ocfs2_super *osb, | |
358 | struct ocfs2_lock_res *lockres, | |
359 | int level) | |
360 | { | |
361 | __ocfs2_cluster_unlock(osb, lockres, level, _RET_IP_); | |
362 | } | |
363 | ||
ccd979bd MF |
364 | static inline void ocfs2_generic_handle_downconvert_action(struct ocfs2_lock_res *lockres); |
365 | static inline void ocfs2_generic_handle_convert_action(struct ocfs2_lock_res *lockres); | |
366 | static inline void ocfs2_generic_handle_attach_action(struct ocfs2_lock_res *lockres); | |
367 | static int ocfs2_generic_handle_bast(struct ocfs2_lock_res *lockres, int level); | |
368 | static void ocfs2_schedule_blocked_lock(struct ocfs2_super *osb, | |
369 | struct ocfs2_lock_res *lockres); | |
370 | static inline void ocfs2_recover_from_dlm_error(struct ocfs2_lock_res *lockres, | |
371 | int convert); | |
c74ff8bb SM |
372 | #define ocfs2_log_dlm_error(_func, _err, _lockres) do { \ |
373 | if ((_lockres)->l_type != OCFS2_LOCK_TYPE_DENTRY) \ | |
374 | mlog(ML_ERROR, "DLM error %d while calling %s on resource %s\n", \ | |
375 | _err, _func, _lockres->l_name); \ | |
376 | else \ | |
377 | mlog(ML_ERROR, "DLM error %d while calling %s on resource %.*s%08x\n", \ | |
378 | _err, _func, OCFS2_DENTRY_LOCK_INO_START - 1, (_lockres)->l_name, \ | |
379 | (unsigned int)ocfs2_get_dentry_lock_ino(_lockres)); \ | |
ccd979bd | 380 | } while (0) |
34d024f8 MF |
381 | static int ocfs2_downconvert_thread(void *arg); |
382 | static void ocfs2_downconvert_on_unlock(struct ocfs2_super *osb, | |
383 | struct ocfs2_lock_res *lockres); | |
e63aecb6 | 384 | static int ocfs2_inode_lock_update(struct inode *inode, |
ccd979bd MF |
385 | struct buffer_head **bh); |
386 | static void ocfs2_drop_osb_locks(struct ocfs2_super *osb); | |
387 | static inline int ocfs2_highest_compat_lock_level(int level); | |
de551246 JB |
388 | static unsigned int ocfs2_prepare_downconvert(struct ocfs2_lock_res *lockres, |
389 | int new_level); | |
cf8e06f1 MF |
390 | static int ocfs2_downconvert_lock(struct ocfs2_super *osb, |
391 | struct ocfs2_lock_res *lockres, | |
392 | int new_level, | |
de551246 JB |
393 | int lvb, |
394 | unsigned int generation); | |
cf8e06f1 MF |
395 | static int ocfs2_prepare_cancel_convert(struct ocfs2_super *osb, |
396 | struct ocfs2_lock_res *lockres); | |
397 | static int ocfs2_cancel_convert(struct ocfs2_super *osb, | |
398 | struct ocfs2_lock_res *lockres); | |
399 | ||
ccd979bd | 400 | |
ccd979bd MF |
401 | static void ocfs2_build_lock_name(enum ocfs2_lock_type type, |
402 | u64 blkno, | |
403 | u32 generation, | |
404 | char *name) | |
405 | { | |
406 | int len; | |
407 | ||
ccd979bd MF |
408 | BUG_ON(type >= OCFS2_NUM_LOCK_TYPES); |
409 | ||
b0697053 MF |
410 | len = snprintf(name, OCFS2_LOCK_ID_MAX_LEN, "%c%s%016llx%08x", |
411 | ocfs2_lock_type_char(type), OCFS2_LOCK_ID_PAD, | |
412 | (long long)blkno, generation); | |
ccd979bd MF |
413 | |
414 | BUG_ON(len != (OCFS2_LOCK_ID_MAX_LEN - 1)); | |
415 | ||
416 | mlog(0, "built lock resource with name: %s\n", name); | |
ccd979bd MF |
417 | } |
418 | ||
34af946a | 419 | static DEFINE_SPINLOCK(ocfs2_dlm_tracking_lock); |
ccd979bd MF |
420 | |
421 | static void ocfs2_add_lockres_tracking(struct ocfs2_lock_res *res, | |
422 | struct ocfs2_dlm_debug *dlm_debug) | |
423 | { | |
424 | mlog(0, "Add tracking for lockres %s\n", res->l_name); | |
425 | ||
426 | spin_lock(&ocfs2_dlm_tracking_lock); | |
427 | list_add(&res->l_debug_list, &dlm_debug->d_lockres_tracking); | |
428 | spin_unlock(&ocfs2_dlm_tracking_lock); | |
429 | } | |
430 | ||
431 | static void ocfs2_remove_lockres_tracking(struct ocfs2_lock_res *res) | |
432 | { | |
433 | spin_lock(&ocfs2_dlm_tracking_lock); | |
434 | if (!list_empty(&res->l_debug_list)) | |
435 | list_del_init(&res->l_debug_list); | |
436 | spin_unlock(&ocfs2_dlm_tracking_lock); | |
437 | } | |
438 | ||
8ddb7b00 SM |
439 | #ifdef CONFIG_OCFS2_FS_STATS |
440 | static void ocfs2_init_lock_stats(struct ocfs2_lock_res *res) | |
441 | { | |
8ddb7b00 | 442 | res->l_lock_refresh = 0; |
5bc970e8 SM |
443 | memset(&res->l_lock_prmode, 0, sizeof(struct ocfs2_lock_stats)); |
444 | memset(&res->l_lock_exmode, 0, sizeof(struct ocfs2_lock_stats)); | |
8ddb7b00 SM |
445 | } |
446 | ||
447 | static void ocfs2_update_lock_stats(struct ocfs2_lock_res *res, int level, | |
448 | struct ocfs2_mask_waiter *mw, int ret) | |
449 | { | |
5bc970e8 SM |
450 | u32 usec; |
451 | ktime_t kt; | |
452 | struct ocfs2_lock_stats *stats; | |
453 | ||
454 | if (level == LKM_PRMODE) | |
455 | stats = &res->l_lock_prmode; | |
456 | else if (level == LKM_EXMODE) | |
457 | stats = &res->l_lock_exmode; | |
458 | else | |
8ddb7b00 SM |
459 | return; |
460 | ||
5bc970e8 SM |
461 | kt = ktime_sub(ktime_get(), mw->mw_lock_start); |
462 | usec = ktime_to_us(kt); | |
463 | ||
464 | stats->ls_gets++; | |
465 | stats->ls_total += ktime_to_ns(kt); | |
466 | /* overflow */ | |
16865b7c | 467 | if (unlikely(stats->ls_gets == 0)) { |
5bc970e8 SM |
468 | stats->ls_gets++; |
469 | stats->ls_total = ktime_to_ns(kt); | |
470 | } | |
471 | ||
472 | if (stats->ls_max < usec) | |
473 | stats->ls_max = usec; | |
474 | ||
8ddb7b00 | 475 | if (ret) |
5bc970e8 | 476 | stats->ls_fail++; |
8ddb7b00 SM |
477 | } |
478 | ||
479 | static inline void ocfs2_track_lock_refresh(struct ocfs2_lock_res *lockres) | |
480 | { | |
481 | lockres->l_lock_refresh++; | |
482 | } | |
483 | ||
484 | static inline void ocfs2_init_start_time(struct ocfs2_mask_waiter *mw) | |
485 | { | |
5bc970e8 | 486 | mw->mw_lock_start = ktime_get(); |
8ddb7b00 SM |
487 | } |
488 | #else | |
489 | static inline void ocfs2_init_lock_stats(struct ocfs2_lock_res *res) | |
490 | { | |
491 | } | |
492 | static inline void ocfs2_update_lock_stats(struct ocfs2_lock_res *res, | |
493 | int level, struct ocfs2_mask_waiter *mw, int ret) | |
494 | { | |
495 | } | |
496 | static inline void ocfs2_track_lock_refresh(struct ocfs2_lock_res *lockres) | |
497 | { | |
498 | } | |
499 | static inline void ocfs2_init_start_time(struct ocfs2_mask_waiter *mw) | |
500 | { | |
501 | } | |
502 | #endif | |
503 | ||
ccd979bd MF |
504 | static void ocfs2_lock_res_init_common(struct ocfs2_super *osb, |
505 | struct ocfs2_lock_res *res, | |
506 | enum ocfs2_lock_type type, | |
ccd979bd MF |
507 | struct ocfs2_lock_res_ops *ops, |
508 | void *priv) | |
509 | { | |
ccd979bd MF |
510 | res->l_type = type; |
511 | res->l_ops = ops; | |
512 | res->l_priv = priv; | |
513 | ||
bd3e7610 JB |
514 | res->l_level = DLM_LOCK_IV; |
515 | res->l_requested = DLM_LOCK_IV; | |
516 | res->l_blocking = DLM_LOCK_IV; | |
ccd979bd MF |
517 | res->l_action = OCFS2_AST_INVALID; |
518 | res->l_unlock_action = OCFS2_UNLOCK_INVALID; | |
519 | ||
520 | res->l_flags = OCFS2_LOCK_INITIALIZED; | |
521 | ||
522 | ocfs2_add_lockres_tracking(res, osb->osb_dlm_debug); | |
8ddb7b00 SM |
523 | |
524 | ocfs2_init_lock_stats(res); | |
cb25797d JK |
525 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
526 | if (type != OCFS2_LOCK_TYPE_OPEN) | |
527 | lockdep_init_map(&res->l_lockdep_map, ocfs2_lock_type_strings[type], | |
528 | &lockdep_keys[type], 0); | |
529 | else | |
530 | res->l_lockdep_map.key = NULL; | |
531 | #endif | |
ccd979bd MF |
532 | } |
533 | ||
534 | void ocfs2_lock_res_init_once(struct ocfs2_lock_res *res) | |
535 | { | |
536 | /* This also clears out the lock status block */ | |
537 | memset(res, 0, sizeof(struct ocfs2_lock_res)); | |
538 | spin_lock_init(&res->l_lock); | |
539 | init_waitqueue_head(&res->l_event); | |
540 | INIT_LIST_HEAD(&res->l_blocked_list); | |
541 | INIT_LIST_HEAD(&res->l_mask_waiters); | |
439a36b8 | 542 | INIT_LIST_HEAD(&res->l_holders); |
ccd979bd MF |
543 | } |
544 | ||
545 | void ocfs2_inode_lock_res_init(struct ocfs2_lock_res *res, | |
546 | enum ocfs2_lock_type type, | |
24c19ef4 | 547 | unsigned int generation, |
ccd979bd MF |
548 | struct inode *inode) |
549 | { | |
550 | struct ocfs2_lock_res_ops *ops; | |
551 | ||
552 | switch(type) { | |
553 | case OCFS2_LOCK_TYPE_RW: | |
554 | ops = &ocfs2_inode_rw_lops; | |
555 | break; | |
556 | case OCFS2_LOCK_TYPE_META: | |
e63aecb6 | 557 | ops = &ocfs2_inode_inode_lops; |
ccd979bd | 558 | break; |
50008630 TY |
559 | case OCFS2_LOCK_TYPE_OPEN: |
560 | ops = &ocfs2_inode_open_lops; | |
561 | break; | |
ccd979bd MF |
562 | default: |
563 | mlog_bug_on_msg(1, "type: %d\n", type); | |
564 | ops = NULL; /* thanks, gcc */ | |
565 | break; | |
566 | }; | |
567 | ||
d680efe9 | 568 | ocfs2_build_lock_name(type, OCFS2_I(inode)->ip_blkno, |
24c19ef4 | 569 | generation, res->l_name); |
d680efe9 MF |
570 | ocfs2_lock_res_init_common(OCFS2_SB(inode->i_sb), res, type, ops, inode); |
571 | } | |
572 | ||
54a7e755 MF |
573 | static struct ocfs2_super *ocfs2_get_inode_osb(struct ocfs2_lock_res *lockres) |
574 | { | |
575 | struct inode *inode = ocfs2_lock_res_inode(lockres); | |
576 | ||
577 | return OCFS2_SB(inode->i_sb); | |
578 | } | |
579 | ||
9e33d69f JK |
580 | static struct ocfs2_super *ocfs2_get_qinfo_osb(struct ocfs2_lock_res *lockres) |
581 | { | |
582 | struct ocfs2_mem_dqinfo *info = lockres->l_priv; | |
583 | ||
584 | return OCFS2_SB(info->dqi_gi.dqi_sb); | |
585 | } | |
586 | ||
cf8e06f1 MF |
587 | static struct ocfs2_super *ocfs2_get_file_osb(struct ocfs2_lock_res *lockres) |
588 | { | |
589 | struct ocfs2_file_private *fp = lockres->l_priv; | |
590 | ||
591 | return OCFS2_SB(fp->fp_file->f_mapping->host->i_sb); | |
592 | } | |
593 | ||
d680efe9 MF |
594 | static __u64 ocfs2_get_dentry_lock_ino(struct ocfs2_lock_res *lockres) |
595 | { | |
596 | __be64 inode_blkno_be; | |
597 | ||
598 | memcpy(&inode_blkno_be, &lockres->l_name[OCFS2_DENTRY_LOCK_INO_START], | |
599 | sizeof(__be64)); | |
600 | ||
601 | return be64_to_cpu(inode_blkno_be); | |
602 | } | |
603 | ||
54a7e755 MF |
604 | static struct ocfs2_super *ocfs2_get_dentry_osb(struct ocfs2_lock_res *lockres) |
605 | { | |
606 | struct ocfs2_dentry_lock *dl = lockres->l_priv; | |
607 | ||
608 | return OCFS2_SB(dl->dl_inode->i_sb); | |
609 | } | |
610 | ||
d680efe9 MF |
611 | void ocfs2_dentry_lock_res_init(struct ocfs2_dentry_lock *dl, |
612 | u64 parent, struct inode *inode) | |
613 | { | |
614 | int len; | |
615 | u64 inode_blkno = OCFS2_I(inode)->ip_blkno; | |
616 | __be64 inode_blkno_be = cpu_to_be64(inode_blkno); | |
617 | struct ocfs2_lock_res *lockres = &dl->dl_lockres; | |
618 | ||
619 | ocfs2_lock_res_init_once(lockres); | |
620 | ||
621 | /* | |
622 | * Unfortunately, the standard lock naming scheme won't work | |
623 | * here because we have two 16 byte values to use. Instead, | |
624 | * we'll stuff the inode number as a binary value. We still | |
625 | * want error prints to show something without garbling the | |
626 | * display, so drop a null byte in there before the inode | |
627 | * number. A future version of OCFS2 will likely use all | |
628 | * binary lock names. The stringified names have been a | |
629 | * tremendous aid in debugging, but now that the debugfs | |
630 | * interface exists, we can mangle things there if need be. | |
631 | * | |
632 | * NOTE: We also drop the standard "pad" value (the total lock | |
633 | * name size stays the same though - the last part is all | |
634 | * zeros due to the memset in ocfs2_lock_res_init_once() | |
635 | */ | |
636 | len = snprintf(lockres->l_name, OCFS2_DENTRY_LOCK_INO_START, | |
637 | "%c%016llx", | |
638 | ocfs2_lock_type_char(OCFS2_LOCK_TYPE_DENTRY), | |
639 | (long long)parent); | |
640 | ||
641 | BUG_ON(len != (OCFS2_DENTRY_LOCK_INO_START - 1)); | |
642 | ||
643 | memcpy(&lockres->l_name[OCFS2_DENTRY_LOCK_INO_START], &inode_blkno_be, | |
644 | sizeof(__be64)); | |
645 | ||
646 | ocfs2_lock_res_init_common(OCFS2_SB(inode->i_sb), lockres, | |
647 | OCFS2_LOCK_TYPE_DENTRY, &ocfs2_dentry_lops, | |
648 | dl); | |
ccd979bd MF |
649 | } |
650 | ||
651 | static void ocfs2_super_lock_res_init(struct ocfs2_lock_res *res, | |
652 | struct ocfs2_super *osb) | |
653 | { | |
654 | /* Superblock lockres doesn't come from a slab so we call init | |
655 | * once on it manually. */ | |
656 | ocfs2_lock_res_init_once(res); | |
d680efe9 MF |
657 | ocfs2_build_lock_name(OCFS2_LOCK_TYPE_SUPER, OCFS2_SUPER_BLOCK_BLKNO, |
658 | 0, res->l_name); | |
ccd979bd | 659 | ocfs2_lock_res_init_common(osb, res, OCFS2_LOCK_TYPE_SUPER, |
ccd979bd MF |
660 | &ocfs2_super_lops, osb); |
661 | } | |
662 | ||
663 | static void ocfs2_rename_lock_res_init(struct ocfs2_lock_res *res, | |
664 | struct ocfs2_super *osb) | |
665 | { | |
666 | /* Rename lockres doesn't come from a slab so we call init | |
667 | * once on it manually. */ | |
668 | ocfs2_lock_res_init_once(res); | |
d680efe9 MF |
669 | ocfs2_build_lock_name(OCFS2_LOCK_TYPE_RENAME, 0, 0, res->l_name); |
670 | ocfs2_lock_res_init_common(osb, res, OCFS2_LOCK_TYPE_RENAME, | |
ccd979bd MF |
671 | &ocfs2_rename_lops, osb); |
672 | } | |
673 | ||
6ca497a8 | 674 | static void ocfs2_nfs_sync_lock_res_init(struct ocfs2_lock_res *res, |
675 | struct ocfs2_super *osb) | |
676 | { | |
677 | /* nfs_sync lockres doesn't come from a slab so we call init | |
678 | * once on it manually. */ | |
679 | ocfs2_lock_res_init_once(res); | |
680 | ocfs2_build_lock_name(OCFS2_LOCK_TYPE_NFS_SYNC, 0, 0, res->l_name); | |
681 | ocfs2_lock_res_init_common(osb, res, OCFS2_LOCK_TYPE_NFS_SYNC, | |
682 | &ocfs2_nfs_sync_lops, osb); | |
683 | } | |
684 | ||
4882abeb GH |
685 | void ocfs2_trim_fs_lock_res_init(struct ocfs2_super *osb) |
686 | { | |
687 | struct ocfs2_lock_res *lockres = &osb->osb_trim_fs_lockres; | |
688 | ||
689 | ocfs2_lock_res_init_once(lockres); | |
690 | ocfs2_build_lock_name(OCFS2_LOCK_TYPE_TRIM_FS, 0, 0, lockres->l_name); | |
691 | ocfs2_lock_res_init_common(osb, lockres, OCFS2_LOCK_TYPE_TRIM_FS, | |
692 | &ocfs2_trim_fs_lops, osb); | |
693 | } | |
694 | ||
695 | void ocfs2_trim_fs_lock_res_uninit(struct ocfs2_super *osb) | |
696 | { | |
697 | struct ocfs2_lock_res *lockres = &osb->osb_trim_fs_lockres; | |
698 | ||
699 | ocfs2_simple_drop_lockres(osb, lockres); | |
700 | ocfs2_lock_res_free(lockres); | |
701 | } | |
702 | ||
83273932 SE |
703 | static void ocfs2_orphan_scan_lock_res_init(struct ocfs2_lock_res *res, |
704 | struct ocfs2_super *osb) | |
705 | { | |
83273932 SE |
706 | ocfs2_lock_res_init_once(res); |
707 | ocfs2_build_lock_name(OCFS2_LOCK_TYPE_ORPHAN_SCAN, 0, 0, res->l_name); | |
708 | ocfs2_lock_res_init_common(osb, res, OCFS2_LOCK_TYPE_ORPHAN_SCAN, | |
709 | &ocfs2_orphan_scan_lops, osb); | |
83273932 SE |
710 | } |
711 | ||
cf8e06f1 MF |
712 | void ocfs2_file_lock_res_init(struct ocfs2_lock_res *lockres, |
713 | struct ocfs2_file_private *fp) | |
714 | { | |
715 | struct inode *inode = fp->fp_file->f_mapping->host; | |
716 | struct ocfs2_inode_info *oi = OCFS2_I(inode); | |
717 | ||
718 | ocfs2_lock_res_init_once(lockres); | |
719 | ocfs2_build_lock_name(OCFS2_LOCK_TYPE_FLOCK, oi->ip_blkno, | |
720 | inode->i_generation, lockres->l_name); | |
721 | ocfs2_lock_res_init_common(OCFS2_SB(inode->i_sb), lockres, | |
722 | OCFS2_LOCK_TYPE_FLOCK, &ocfs2_flock_lops, | |
723 | fp); | |
724 | lockres->l_flags |= OCFS2_LOCK_NOCACHE; | |
725 | } | |
726 | ||
9e33d69f JK |
727 | void ocfs2_qinfo_lock_res_init(struct ocfs2_lock_res *lockres, |
728 | struct ocfs2_mem_dqinfo *info) | |
729 | { | |
730 | ocfs2_lock_res_init_once(lockres); | |
731 | ocfs2_build_lock_name(OCFS2_LOCK_TYPE_QINFO, info->dqi_gi.dqi_type, | |
732 | 0, lockres->l_name); | |
733 | ocfs2_lock_res_init_common(OCFS2_SB(info->dqi_gi.dqi_sb), lockres, | |
734 | OCFS2_LOCK_TYPE_QINFO, &ocfs2_qinfo_lops, | |
735 | info); | |
736 | } | |
737 | ||
8dec98ed TM |
738 | void ocfs2_refcount_lock_res_init(struct ocfs2_lock_res *lockres, |
739 | struct ocfs2_super *osb, u64 ref_blkno, | |
740 | unsigned int generation) | |
741 | { | |
742 | ocfs2_lock_res_init_once(lockres); | |
743 | ocfs2_build_lock_name(OCFS2_LOCK_TYPE_REFCOUNT, ref_blkno, | |
744 | generation, lockres->l_name); | |
745 | ocfs2_lock_res_init_common(osb, lockres, OCFS2_LOCK_TYPE_REFCOUNT, | |
746 | &ocfs2_refcount_block_lops, osb); | |
747 | } | |
748 | ||
ccd979bd MF |
749 | void ocfs2_lock_res_free(struct ocfs2_lock_res *res) |
750 | { | |
ccd979bd MF |
751 | if (!(res->l_flags & OCFS2_LOCK_INITIALIZED)) |
752 | return; | |
753 | ||
754 | ocfs2_remove_lockres_tracking(res); | |
755 | ||
756 | mlog_bug_on_msg(!list_empty(&res->l_blocked_list), | |
757 | "Lockres %s is on the blocked list\n", | |
758 | res->l_name); | |
759 | mlog_bug_on_msg(!list_empty(&res->l_mask_waiters), | |
760 | "Lockres %s has mask waiters pending\n", | |
761 | res->l_name); | |
762 | mlog_bug_on_msg(spin_is_locked(&res->l_lock), | |
763 | "Lockres %s is locked\n", | |
764 | res->l_name); | |
765 | mlog_bug_on_msg(res->l_ro_holders, | |
766 | "Lockres %s has %u ro holders\n", | |
767 | res->l_name, res->l_ro_holders); | |
768 | mlog_bug_on_msg(res->l_ex_holders, | |
769 | "Lockres %s has %u ex holders\n", | |
770 | res->l_name, res->l_ex_holders); | |
771 | ||
772 | /* Need to clear out the lock status block for the dlm */ | |
773 | memset(&res->l_lksb, 0, sizeof(res->l_lksb)); | |
774 | ||
775 | res->l_flags = 0UL; | |
ccd979bd MF |
776 | } |
777 | ||
439a36b8 ER |
778 | /* |
779 | * Keep a list of processes who have interest in a lockres. | |
780 | * Note: this is now only uesed for check recursive cluster locking. | |
781 | */ | |
782 | static inline void ocfs2_add_holder(struct ocfs2_lock_res *lockres, | |
783 | struct ocfs2_lock_holder *oh) | |
784 | { | |
785 | INIT_LIST_HEAD(&oh->oh_list); | |
786 | oh->oh_owner_pid = get_pid(task_pid(current)); | |
787 | ||
788 | spin_lock(&lockres->l_lock); | |
789 | list_add_tail(&oh->oh_list, &lockres->l_holders); | |
790 | spin_unlock(&lockres->l_lock); | |
791 | } | |
792 | ||
133b81f2 LC |
793 | static struct ocfs2_lock_holder * |
794 | ocfs2_pid_holder(struct ocfs2_lock_res *lockres, | |
795 | struct pid *pid) | |
439a36b8 ER |
796 | { |
797 | struct ocfs2_lock_holder *oh; | |
439a36b8 | 798 | |
439a36b8 | 799 | spin_lock(&lockres->l_lock); |
439a36b8 ER |
800 | list_for_each_entry(oh, &lockres->l_holders, oh_list) { |
801 | if (oh->oh_owner_pid == pid) { | |
802 | spin_unlock(&lockres->l_lock); | |
133b81f2 | 803 | return oh; |
439a36b8 ER |
804 | } |
805 | } | |
806 | spin_unlock(&lockres->l_lock); | |
133b81f2 LC |
807 | return NULL; |
808 | } | |
439a36b8 | 809 | |
133b81f2 LC |
810 | static inline void ocfs2_remove_holder(struct ocfs2_lock_res *lockres, |
811 | struct ocfs2_lock_holder *oh) | |
812 | { | |
813 | spin_lock(&lockres->l_lock); | |
814 | list_del(&oh->oh_list); | |
815 | spin_unlock(&lockres->l_lock); | |
816 | ||
817 | put_pid(oh->oh_owner_pid); | |
439a36b8 ER |
818 | } |
819 | ||
133b81f2 | 820 | |
ccd979bd MF |
821 | static inline void ocfs2_inc_holders(struct ocfs2_lock_res *lockres, |
822 | int level) | |
823 | { | |
ccd979bd MF |
824 | BUG_ON(!lockres); |
825 | ||
826 | switch(level) { | |
bd3e7610 | 827 | case DLM_LOCK_EX: |
ccd979bd MF |
828 | lockres->l_ex_holders++; |
829 | break; | |
bd3e7610 | 830 | case DLM_LOCK_PR: |
ccd979bd MF |
831 | lockres->l_ro_holders++; |
832 | break; | |
833 | default: | |
834 | BUG(); | |
835 | } | |
ccd979bd MF |
836 | } |
837 | ||
838 | static inline void ocfs2_dec_holders(struct ocfs2_lock_res *lockres, | |
839 | int level) | |
840 | { | |
ccd979bd MF |
841 | BUG_ON(!lockres); |
842 | ||
843 | switch(level) { | |
bd3e7610 | 844 | case DLM_LOCK_EX: |
ccd979bd MF |
845 | BUG_ON(!lockres->l_ex_holders); |
846 | lockres->l_ex_holders--; | |
847 | break; | |
bd3e7610 | 848 | case DLM_LOCK_PR: |
ccd979bd MF |
849 | BUG_ON(!lockres->l_ro_holders); |
850 | lockres->l_ro_holders--; | |
851 | break; | |
852 | default: | |
853 | BUG(); | |
854 | } | |
ccd979bd MF |
855 | } |
856 | ||
857 | /* WARNING: This function lives in a world where the only three lock | |
858 | * levels are EX, PR, and NL. It *will* have to be adjusted when more | |
859 | * lock types are added. */ | |
860 | static inline int ocfs2_highest_compat_lock_level(int level) | |
861 | { | |
bd3e7610 | 862 | int new_level = DLM_LOCK_EX; |
ccd979bd | 863 | |
bd3e7610 JB |
864 | if (level == DLM_LOCK_EX) |
865 | new_level = DLM_LOCK_NL; | |
866 | else if (level == DLM_LOCK_PR) | |
867 | new_level = DLM_LOCK_PR; | |
ccd979bd MF |
868 | return new_level; |
869 | } | |
870 | ||
871 | static void lockres_set_flags(struct ocfs2_lock_res *lockres, | |
872 | unsigned long newflags) | |
873 | { | |
800deef3 | 874 | struct ocfs2_mask_waiter *mw, *tmp; |
ccd979bd MF |
875 | |
876 | assert_spin_locked(&lockres->l_lock); | |
877 | ||
878 | lockres->l_flags = newflags; | |
879 | ||
800deef3 | 880 | list_for_each_entry_safe(mw, tmp, &lockres->l_mask_waiters, mw_item) { |
ccd979bd MF |
881 | if ((lockres->l_flags & mw->mw_mask) != mw->mw_goal) |
882 | continue; | |
883 | ||
884 | list_del_init(&mw->mw_item); | |
885 | mw->mw_status = 0; | |
886 | complete(&mw->mw_complete); | |
887 | } | |
888 | } | |
889 | static void lockres_or_flags(struct ocfs2_lock_res *lockres, unsigned long or) | |
890 | { | |
891 | lockres_set_flags(lockres, lockres->l_flags | or); | |
892 | } | |
893 | static void lockres_clear_flags(struct ocfs2_lock_res *lockres, | |
894 | unsigned long clear) | |
895 | { | |
896 | lockres_set_flags(lockres, lockres->l_flags & ~clear); | |
897 | } | |
898 | ||
899 | static inline void ocfs2_generic_handle_downconvert_action(struct ocfs2_lock_res *lockres) | |
900 | { | |
ccd979bd MF |
901 | BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BUSY)); |
902 | BUG_ON(!(lockres->l_flags & OCFS2_LOCK_ATTACHED)); | |
903 | BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BLOCKED)); | |
bd3e7610 | 904 | BUG_ON(lockres->l_blocking <= DLM_LOCK_NL); |
ccd979bd MF |
905 | |
906 | lockres->l_level = lockres->l_requested; | |
907 | if (lockres->l_level <= | |
908 | ocfs2_highest_compat_lock_level(lockres->l_blocking)) { | |
bd3e7610 | 909 | lockres->l_blocking = DLM_LOCK_NL; |
ccd979bd MF |
910 | lockres_clear_flags(lockres, OCFS2_LOCK_BLOCKED); |
911 | } | |
912 | lockres_clear_flags(lockres, OCFS2_LOCK_BUSY); | |
ccd979bd MF |
913 | } |
914 | ||
915 | static inline void ocfs2_generic_handle_convert_action(struct ocfs2_lock_res *lockres) | |
916 | { | |
ccd979bd MF |
917 | BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BUSY)); |
918 | BUG_ON(!(lockres->l_flags & OCFS2_LOCK_ATTACHED)); | |
919 | ||
920 | /* Convert from RO to EX doesn't really need anything as our | |
921 | * information is already up to data. Convert from NL to | |
922 | * *anything* however should mark ourselves as needing an | |
923 | * update */ | |
bd3e7610 | 924 | if (lockres->l_level == DLM_LOCK_NL && |
f625c979 | 925 | lockres->l_ops->flags & LOCK_TYPE_REQUIRES_REFRESH) |
ccd979bd MF |
926 | lockres_or_flags(lockres, OCFS2_LOCK_NEEDS_REFRESH); |
927 | ||
928 | lockres->l_level = lockres->l_requested; | |
a1912826 SM |
929 | |
930 | /* | |
931 | * We set the OCFS2_LOCK_UPCONVERT_FINISHING flag before clearing | |
932 | * the OCFS2_LOCK_BUSY flag to prevent the dc thread from | |
933 | * downconverting the lock before the upconvert has fully completed. | |
d1e78238 X |
934 | * Do not prevent the dc thread from downconverting if NONBLOCK lock |
935 | * had already returned. | |
a1912826 | 936 | */ |
d1e78238 X |
937 | if (!(lockres->l_flags & OCFS2_LOCK_NONBLOCK_FINISHED)) |
938 | lockres_or_flags(lockres, OCFS2_LOCK_UPCONVERT_FINISHING); | |
939 | else | |
940 | lockres_clear_flags(lockres, OCFS2_LOCK_NONBLOCK_FINISHED); | |
a1912826 | 941 | |
ccd979bd | 942 | lockres_clear_flags(lockres, OCFS2_LOCK_BUSY); |
ccd979bd MF |
943 | } |
944 | ||
945 | static inline void ocfs2_generic_handle_attach_action(struct ocfs2_lock_res *lockres) | |
946 | { | |
3cf0c507 | 947 | BUG_ON((!(lockres->l_flags & OCFS2_LOCK_BUSY))); |
ccd979bd MF |
948 | BUG_ON(lockres->l_flags & OCFS2_LOCK_ATTACHED); |
949 | ||
bd3e7610 | 950 | if (lockres->l_requested > DLM_LOCK_NL && |
f625c979 MF |
951 | !(lockres->l_flags & OCFS2_LOCK_LOCAL) && |
952 | lockres->l_ops->flags & LOCK_TYPE_REQUIRES_REFRESH) | |
ccd979bd MF |
953 | lockres_or_flags(lockres, OCFS2_LOCK_NEEDS_REFRESH); |
954 | ||
955 | lockres->l_level = lockres->l_requested; | |
956 | lockres_or_flags(lockres, OCFS2_LOCK_ATTACHED); | |
957 | lockres_clear_flags(lockres, OCFS2_LOCK_BUSY); | |
ccd979bd MF |
958 | } |
959 | ||
ccd979bd MF |
960 | static int ocfs2_generic_handle_bast(struct ocfs2_lock_res *lockres, |
961 | int level) | |
962 | { | |
963 | int needs_downconvert = 0; | |
ccd979bd MF |
964 | |
965 | assert_spin_locked(&lockres->l_lock); | |
966 | ||
ccd979bd MF |
967 | if (level > lockres->l_blocking) { |
968 | /* only schedule a downconvert if we haven't already scheduled | |
969 | * one that goes low enough to satisfy the level we're | |
970 | * blocking. this also catches the case where we get | |
971 | * duplicate BASTs */ | |
972 | if (ocfs2_highest_compat_lock_level(level) < | |
973 | ocfs2_highest_compat_lock_level(lockres->l_blocking)) | |
974 | needs_downconvert = 1; | |
975 | ||
976 | lockres->l_blocking = level; | |
977 | } | |
978 | ||
9b915181 SM |
979 | mlog(ML_BASTS, "lockres %s, block %d, level %d, l_block %d, dwn %d\n", |
980 | lockres->l_name, level, lockres->l_level, lockres->l_blocking, | |
981 | needs_downconvert); | |
982 | ||
0b94a909 WW |
983 | if (needs_downconvert) |
984 | lockres_or_flags(lockres, OCFS2_LOCK_BLOCKED); | |
c1e8d35e | 985 | mlog(0, "needs_downconvert = %d\n", needs_downconvert); |
ccd979bd MF |
986 | return needs_downconvert; |
987 | } | |
988 | ||
de551246 JB |
989 | /* |
990 | * OCFS2_LOCK_PENDING and l_pending_gen. | |
991 | * | |
992 | * Why does OCFS2_LOCK_PENDING exist? To close a race between setting | |
993 | * OCFS2_LOCK_BUSY and calling ocfs2_dlm_lock(). See ocfs2_unblock_lock() | |
994 | * for more details on the race. | |
995 | * | |
996 | * OCFS2_LOCK_PENDING closes the race quite nicely. However, it introduces | |
997 | * a race on itself. In o2dlm, we can get the ast before ocfs2_dlm_lock() | |
998 | * returns. The ast clears OCFS2_LOCK_BUSY, and must therefore clear | |
999 | * OCFS2_LOCK_PENDING at the same time. When ocfs2_dlm_lock() returns, | |
1000 | * the caller is going to try to clear PENDING again. If nothing else is | |
1001 | * happening, __lockres_clear_pending() sees PENDING is unset and does | |
1002 | * nothing. | |
1003 | * | |
1004 | * But what if another path (eg downconvert thread) has just started a | |
1005 | * new locking action? The other path has re-set PENDING. Our path | |
1006 | * cannot clear PENDING, because that will re-open the original race | |
1007 | * window. | |
1008 | * | |
1009 | * [Example] | |
1010 | * | |
1011 | * ocfs2_meta_lock() | |
1012 | * ocfs2_cluster_lock() | |
1013 | * set BUSY | |
1014 | * set PENDING | |
1015 | * drop l_lock | |
1016 | * ocfs2_dlm_lock() | |
1017 | * ocfs2_locking_ast() ocfs2_downconvert_thread() | |
1018 | * clear PENDING ocfs2_unblock_lock() | |
1019 | * take_l_lock | |
1020 | * !BUSY | |
1021 | * ocfs2_prepare_downconvert() | |
1022 | * set BUSY | |
1023 | * set PENDING | |
1024 | * drop l_lock | |
1025 | * take l_lock | |
1026 | * clear PENDING | |
1027 | * drop l_lock | |
1028 | * <window> | |
1029 | * ocfs2_dlm_lock() | |
1030 | * | |
1031 | * So as you can see, we now have a window where l_lock is not held, | |
1032 | * PENDING is not set, and ocfs2_dlm_lock() has not been called. | |
1033 | * | |
1034 | * The core problem is that ocfs2_cluster_lock() has cleared the PENDING | |
1035 | * set by ocfs2_prepare_downconvert(). That wasn't nice. | |
1036 | * | |
1037 | * To solve this we introduce l_pending_gen. A call to | |
1038 | * lockres_clear_pending() will only do so when it is passed a generation | |
1039 | * number that matches the lockres. lockres_set_pending() will return the | |
1040 | * current generation number. When ocfs2_cluster_lock() goes to clear | |
1041 | * PENDING, it passes the generation it got from set_pending(). In our | |
1042 | * example above, the generation numbers will *not* match. Thus, | |
1043 | * ocfs2_cluster_lock() will not clear the PENDING set by | |
1044 | * ocfs2_prepare_downconvert(). | |
1045 | */ | |
1046 | ||
1047 | /* Unlocked version for ocfs2_locking_ast() */ | |
1048 | static void __lockres_clear_pending(struct ocfs2_lock_res *lockres, | |
1049 | unsigned int generation, | |
1050 | struct ocfs2_super *osb) | |
1051 | { | |
1052 | assert_spin_locked(&lockres->l_lock); | |
1053 | ||
1054 | /* | |
1055 | * The ast and locking functions can race us here. The winner | |
1056 | * will clear pending, the loser will not. | |
1057 | */ | |
1058 | if (!(lockres->l_flags & OCFS2_LOCK_PENDING) || | |
1059 | (lockres->l_pending_gen != generation)) | |
1060 | return; | |
1061 | ||
1062 | lockres_clear_flags(lockres, OCFS2_LOCK_PENDING); | |
1063 | lockres->l_pending_gen++; | |
1064 | ||
1065 | /* | |
1066 | * The downconvert thread may have skipped us because we | |
1067 | * were PENDING. Wake it up. | |
1068 | */ | |
1069 | if (lockres->l_flags & OCFS2_LOCK_BLOCKED) | |
1070 | ocfs2_wake_downconvert_thread(osb); | |
1071 | } | |
1072 | ||
1073 | /* Locked version for callers of ocfs2_dlm_lock() */ | |
1074 | static void lockres_clear_pending(struct ocfs2_lock_res *lockres, | |
1075 | unsigned int generation, | |
1076 | struct ocfs2_super *osb) | |
1077 | { | |
1078 | unsigned long flags; | |
1079 | ||
1080 | spin_lock_irqsave(&lockres->l_lock, flags); | |
1081 | __lockres_clear_pending(lockres, generation, osb); | |
1082 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
1083 | } | |
1084 | ||
1085 | static unsigned int lockres_set_pending(struct ocfs2_lock_res *lockres) | |
1086 | { | |
1087 | assert_spin_locked(&lockres->l_lock); | |
1088 | BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BUSY)); | |
1089 | ||
1090 | lockres_or_flags(lockres, OCFS2_LOCK_PENDING); | |
1091 | ||
1092 | return lockres->l_pending_gen; | |
1093 | } | |
1094 | ||
c0e41338 | 1095 | static void ocfs2_blocking_ast(struct ocfs2_dlm_lksb *lksb, int level) |
ccd979bd | 1096 | { |
a796d286 | 1097 | struct ocfs2_lock_res *lockres = ocfs2_lksb_to_lock_res(lksb); |
aa2623ad | 1098 | struct ocfs2_super *osb = ocfs2_get_lockres_osb(lockres); |
ccd979bd MF |
1099 | int needs_downconvert; |
1100 | unsigned long flags; | |
1101 | ||
bd3e7610 | 1102 | BUG_ON(level <= DLM_LOCK_NL); |
ccd979bd | 1103 | |
9b915181 SM |
1104 | mlog(ML_BASTS, "BAST fired for lockres %s, blocking %d, level %d, " |
1105 | "type %s\n", lockres->l_name, level, lockres->l_level, | |
aa2623ad MF |
1106 | ocfs2_lock_type_string(lockres->l_type)); |
1107 | ||
cf8e06f1 MF |
1108 | /* |
1109 | * We can skip the bast for locks which don't enable caching - | |
1110 | * they'll be dropped at the earliest possible time anyway. | |
1111 | */ | |
1112 | if (lockres->l_flags & OCFS2_LOCK_NOCACHE) | |
1113 | return; | |
1114 | ||
ccd979bd MF |
1115 | spin_lock_irqsave(&lockres->l_lock, flags); |
1116 | needs_downconvert = ocfs2_generic_handle_bast(lockres, level); | |
1117 | if (needs_downconvert) | |
1118 | ocfs2_schedule_blocked_lock(osb, lockres); | |
1119 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
1120 | ||
d680efe9 MF |
1121 | wake_up(&lockres->l_event); |
1122 | ||
34d024f8 | 1123 | ocfs2_wake_downconvert_thread(osb); |
ccd979bd MF |
1124 | } |
1125 | ||
c0e41338 | 1126 | static void ocfs2_locking_ast(struct ocfs2_dlm_lksb *lksb) |
ccd979bd | 1127 | { |
a796d286 | 1128 | struct ocfs2_lock_res *lockres = ocfs2_lksb_to_lock_res(lksb); |
de551246 | 1129 | struct ocfs2_super *osb = ocfs2_get_lockres_osb(lockres); |
ccd979bd | 1130 | unsigned long flags; |
1693a5c0 | 1131 | int status; |
ccd979bd MF |
1132 | |
1133 | spin_lock_irqsave(&lockres->l_lock, flags); | |
1134 | ||
1693a5c0 DT |
1135 | status = ocfs2_dlm_lock_status(&lockres->l_lksb); |
1136 | ||
1137 | if (status == -EAGAIN) { | |
1138 | lockres_clear_flags(lockres, OCFS2_LOCK_BUSY); | |
1139 | goto out; | |
1140 | } | |
1141 | ||
1142 | if (status) { | |
8f2c9c1b | 1143 | mlog(ML_ERROR, "lockres %s: lksb status value of %d!\n", |
1693a5c0 | 1144 | lockres->l_name, status); |
ccd979bd MF |
1145 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
1146 | return; | |
1147 | } | |
1148 | ||
9b915181 SM |
1149 | mlog(ML_BASTS, "AST fired for lockres %s, action %d, unlock %d, " |
1150 | "level %d => %d\n", lockres->l_name, lockres->l_action, | |
1151 | lockres->l_unlock_action, lockres->l_level, lockres->l_requested); | |
1152 | ||
ccd979bd MF |
1153 | switch(lockres->l_action) { |
1154 | case OCFS2_AST_ATTACH: | |
1155 | ocfs2_generic_handle_attach_action(lockres); | |
e92d57df | 1156 | lockres_clear_flags(lockres, OCFS2_LOCK_LOCAL); |
ccd979bd MF |
1157 | break; |
1158 | case OCFS2_AST_CONVERT: | |
1159 | ocfs2_generic_handle_convert_action(lockres); | |
1160 | break; | |
1161 | case OCFS2_AST_DOWNCONVERT: | |
1162 | ocfs2_generic_handle_downconvert_action(lockres); | |
1163 | break; | |
1164 | default: | |
9b915181 SM |
1165 | mlog(ML_ERROR, "lockres %s: AST fired with invalid action: %u, " |
1166 | "flags 0x%lx, unlock: %u\n", | |
e92d57df MF |
1167 | lockres->l_name, lockres->l_action, lockres->l_flags, |
1168 | lockres->l_unlock_action); | |
ccd979bd MF |
1169 | BUG(); |
1170 | } | |
1693a5c0 | 1171 | out: |
ccd979bd MF |
1172 | /* set it to something invalid so if we get called again we |
1173 | * can catch it. */ | |
1174 | lockres->l_action = OCFS2_AST_INVALID; | |
ccd979bd | 1175 | |
de551246 JB |
1176 | /* Did we try to cancel this lock? Clear that state */ |
1177 | if (lockres->l_unlock_action == OCFS2_UNLOCK_CANCEL_CONVERT) | |
1178 | lockres->l_unlock_action = OCFS2_UNLOCK_INVALID; | |
1179 | ||
1180 | /* | |
1181 | * We may have beaten the locking functions here. We certainly | |
1182 | * know that dlm_lock() has been called :-) | |
1183 | * Because we can't have two lock calls in flight at once, we | |
1184 | * can use lockres->l_pending_gen. | |
1185 | */ | |
1186 | __lockres_clear_pending(lockres, lockres->l_pending_gen, osb); | |
1187 | ||
ccd979bd | 1188 | wake_up(&lockres->l_event); |
d680efe9 | 1189 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
ccd979bd MF |
1190 | } |
1191 | ||
553b5eb9 JB |
1192 | static void ocfs2_unlock_ast(struct ocfs2_dlm_lksb *lksb, int error) |
1193 | { | |
1194 | struct ocfs2_lock_res *lockres = ocfs2_lksb_to_lock_res(lksb); | |
1195 | unsigned long flags; | |
1196 | ||
9b915181 SM |
1197 | mlog(ML_BASTS, "UNLOCK AST fired for lockres %s, action = %d\n", |
1198 | lockres->l_name, lockres->l_unlock_action); | |
553b5eb9 JB |
1199 | |
1200 | spin_lock_irqsave(&lockres->l_lock, flags); | |
1201 | if (error) { | |
1202 | mlog(ML_ERROR, "Dlm passes error %d for lock %s, " | |
1203 | "unlock_action %d\n", error, lockres->l_name, | |
1204 | lockres->l_unlock_action); | |
1205 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
553b5eb9 JB |
1206 | return; |
1207 | } | |
1208 | ||
1209 | switch(lockres->l_unlock_action) { | |
1210 | case OCFS2_UNLOCK_CANCEL_CONVERT: | |
1211 | mlog(0, "Cancel convert success for %s\n", lockres->l_name); | |
1212 | lockres->l_action = OCFS2_AST_INVALID; | |
1213 | /* Downconvert thread may have requeued this lock, we | |
1214 | * need to wake it. */ | |
1215 | if (lockres->l_flags & OCFS2_LOCK_BLOCKED) | |
1216 | ocfs2_wake_downconvert_thread(ocfs2_get_lockres_osb(lockres)); | |
1217 | break; | |
1218 | case OCFS2_UNLOCK_DROP_LOCK: | |
1219 | lockres->l_level = DLM_LOCK_IV; | |
1220 | break; | |
1221 | default: | |
1222 | BUG(); | |
1223 | } | |
1224 | ||
1225 | lockres_clear_flags(lockres, OCFS2_LOCK_BUSY); | |
1226 | lockres->l_unlock_action = OCFS2_UNLOCK_INVALID; | |
1227 | wake_up(&lockres->l_event); | |
1228 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
553b5eb9 JB |
1229 | } |
1230 | ||
1231 | /* | |
1232 | * This is the filesystem locking protocol. It provides the lock handling | |
1233 | * hooks for the underlying DLM. It has a maximum version number. | |
1234 | * The version number allows interoperability with systems running at | |
1235 | * the same major number and an equal or smaller minor number. | |
1236 | * | |
1237 | * Whenever the filesystem does new things with locks (adds or removes a | |
1238 | * lock, orders them differently, does different things underneath a lock), | |
1239 | * the version must be changed. The protocol is negotiated when joining | |
1240 | * the dlm domain. A node may join the domain if its major version is | |
1241 | * identical to all other nodes and its minor version is greater than | |
1242 | * or equal to all other nodes. When its minor version is greater than | |
1243 | * the other nodes, it will run at the minor version specified by the | |
1244 | * other nodes. | |
1245 | * | |
1246 | * If a locking change is made that will not be compatible with older | |
1247 | * versions, the major number must be increased and the minor version set | |
1248 | * to zero. If a change merely adds a behavior that can be disabled when | |
1249 | * speaking to older versions, the minor version must be increased. If a | |
1250 | * change adds a fully backwards compatible change (eg, LVB changes that | |
1251 | * are just ignored by older versions), the version does not need to be | |
1252 | * updated. | |
1253 | */ | |
1254 | static struct ocfs2_locking_protocol lproto = { | |
1255 | .lp_max_version = { | |
1256 | .pv_major = OCFS2_LOCKING_PROTOCOL_MAJOR, | |
1257 | .pv_minor = OCFS2_LOCKING_PROTOCOL_MINOR, | |
1258 | }, | |
1259 | .lp_lock_ast = ocfs2_locking_ast, | |
1260 | .lp_blocking_ast = ocfs2_blocking_ast, | |
1261 | .lp_unlock_ast = ocfs2_unlock_ast, | |
1262 | }; | |
1263 | ||
1264 | void ocfs2_set_locking_protocol(void) | |
1265 | { | |
1266 | ocfs2_stack_glue_set_max_proto_version(&lproto.lp_max_version); | |
1267 | } | |
1268 | ||
ccd979bd MF |
1269 | static inline void ocfs2_recover_from_dlm_error(struct ocfs2_lock_res *lockres, |
1270 | int convert) | |
1271 | { | |
1272 | unsigned long flags; | |
1273 | ||
ccd979bd MF |
1274 | spin_lock_irqsave(&lockres->l_lock, flags); |
1275 | lockres_clear_flags(lockres, OCFS2_LOCK_BUSY); | |
a1912826 | 1276 | lockres_clear_flags(lockres, OCFS2_LOCK_UPCONVERT_FINISHING); |
ccd979bd MF |
1277 | if (convert) |
1278 | lockres->l_action = OCFS2_AST_INVALID; | |
1279 | else | |
1280 | lockres->l_unlock_action = OCFS2_UNLOCK_INVALID; | |
1281 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
1282 | ||
1283 | wake_up(&lockres->l_event); | |
ccd979bd MF |
1284 | } |
1285 | ||
1286 | /* Note: If we detect another process working on the lock (i.e., | |
1287 | * OCFS2_LOCK_BUSY), we'll bail out returning 0. It's up to the caller | |
1288 | * to do the right thing in that case. | |
1289 | */ | |
1290 | static int ocfs2_lock_create(struct ocfs2_super *osb, | |
1291 | struct ocfs2_lock_res *lockres, | |
1292 | int level, | |
bd3e7610 | 1293 | u32 dlm_flags) |
ccd979bd MF |
1294 | { |
1295 | int ret = 0; | |
ccd979bd | 1296 | unsigned long flags; |
de551246 | 1297 | unsigned int gen; |
ccd979bd | 1298 | |
bd3e7610 | 1299 | mlog(0, "lock %s, level = %d, flags = %u\n", lockres->l_name, level, |
ccd979bd MF |
1300 | dlm_flags); |
1301 | ||
1302 | spin_lock_irqsave(&lockres->l_lock, flags); | |
1303 | if ((lockres->l_flags & OCFS2_LOCK_ATTACHED) || | |
1304 | (lockres->l_flags & OCFS2_LOCK_BUSY)) { | |
1305 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
1306 | goto bail; | |
1307 | } | |
1308 | ||
1309 | lockres->l_action = OCFS2_AST_ATTACH; | |
1310 | lockres->l_requested = level; | |
1311 | lockres_or_flags(lockres, OCFS2_LOCK_BUSY); | |
de551246 | 1312 | gen = lockres_set_pending(lockres); |
ccd979bd MF |
1313 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
1314 | ||
4670c46d | 1315 | ret = ocfs2_dlm_lock(osb->cconn, |
7431cd7e JB |
1316 | level, |
1317 | &lockres->l_lksb, | |
1318 | dlm_flags, | |
1319 | lockres->l_name, | |
a796d286 | 1320 | OCFS2_LOCK_ID_MAX_LEN - 1); |
de551246 | 1321 | lockres_clear_pending(lockres, gen, osb); |
7431cd7e JB |
1322 | if (ret) { |
1323 | ocfs2_log_dlm_error("ocfs2_dlm_lock", ret, lockres); | |
ccd979bd MF |
1324 | ocfs2_recover_from_dlm_error(lockres, 1); |
1325 | } | |
1326 | ||
7431cd7e | 1327 | mlog(0, "lock %s, return from ocfs2_dlm_lock\n", lockres->l_name); |
ccd979bd MF |
1328 | |
1329 | bail: | |
ccd979bd MF |
1330 | return ret; |
1331 | } | |
1332 | ||
1333 | static inline int ocfs2_check_wait_flag(struct ocfs2_lock_res *lockres, | |
1334 | int flag) | |
1335 | { | |
1336 | unsigned long flags; | |
1337 | int ret; | |
1338 | ||
1339 | spin_lock_irqsave(&lockres->l_lock, flags); | |
1340 | ret = lockres->l_flags & flag; | |
1341 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
1342 | ||
1343 | return ret; | |
1344 | } | |
1345 | ||
1346 | static inline void ocfs2_wait_on_busy_lock(struct ocfs2_lock_res *lockres) | |
1347 | ||
1348 | { | |
1349 | wait_event(lockres->l_event, | |
1350 | !ocfs2_check_wait_flag(lockres, OCFS2_LOCK_BUSY)); | |
1351 | } | |
1352 | ||
1353 | static inline void ocfs2_wait_on_refreshing_lock(struct ocfs2_lock_res *lockres) | |
1354 | ||
1355 | { | |
1356 | wait_event(lockres->l_event, | |
1357 | !ocfs2_check_wait_flag(lockres, OCFS2_LOCK_REFRESHING)); | |
1358 | } | |
1359 | ||
1360 | /* predict what lock level we'll be dropping down to on behalf | |
1361 | * of another node, and return true if the currently wanted | |
1362 | * level will be compatible with it. */ | |
1363 | static inline int ocfs2_may_continue_on_blocked_lock(struct ocfs2_lock_res *lockres, | |
1364 | int wanted) | |
1365 | { | |
1366 | BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BLOCKED)); | |
1367 | ||
1368 | return wanted <= ocfs2_highest_compat_lock_level(lockres->l_blocking); | |
1369 | } | |
1370 | ||
1371 | static void ocfs2_init_mask_waiter(struct ocfs2_mask_waiter *mw) | |
1372 | { | |
1373 | INIT_LIST_HEAD(&mw->mw_item); | |
1374 | init_completion(&mw->mw_complete); | |
8ddb7b00 | 1375 | ocfs2_init_start_time(mw); |
ccd979bd MF |
1376 | } |
1377 | ||
1378 | static int ocfs2_wait_for_mask(struct ocfs2_mask_waiter *mw) | |
1379 | { | |
1380 | wait_for_completion(&mw->mw_complete); | |
1381 | /* Re-arm the completion in case we want to wait on it again */ | |
16735d02 | 1382 | reinit_completion(&mw->mw_complete); |
ccd979bd MF |
1383 | return mw->mw_status; |
1384 | } | |
1385 | ||
1386 | static void lockres_add_mask_waiter(struct ocfs2_lock_res *lockres, | |
1387 | struct ocfs2_mask_waiter *mw, | |
1388 | unsigned long mask, | |
1389 | unsigned long goal) | |
1390 | { | |
1391 | BUG_ON(!list_empty(&mw->mw_item)); | |
1392 | ||
1393 | assert_spin_locked(&lockres->l_lock); | |
1394 | ||
1395 | list_add_tail(&mw->mw_item, &lockres->l_mask_waiters); | |
1396 | mw->mw_mask = mask; | |
1397 | mw->mw_goal = goal; | |
1398 | } | |
1399 | ||
1400 | /* returns 0 if the mw that was removed was already satisfied, -EBUSY | |
1401 | * if the mask still hadn't reached its goal */ | |
d1e78238 | 1402 | static int __lockres_remove_mask_waiter(struct ocfs2_lock_res *lockres, |
ccd979bd MF |
1403 | struct ocfs2_mask_waiter *mw) |
1404 | { | |
ccd979bd MF |
1405 | int ret = 0; |
1406 | ||
d1e78238 | 1407 | assert_spin_locked(&lockres->l_lock); |
ccd979bd MF |
1408 | if (!list_empty(&mw->mw_item)) { |
1409 | if ((lockres->l_flags & mw->mw_mask) != mw->mw_goal) | |
1410 | ret = -EBUSY; | |
1411 | ||
1412 | list_del_init(&mw->mw_item); | |
1413 | init_completion(&mw->mw_complete); | |
1414 | } | |
d1e78238 X |
1415 | |
1416 | return ret; | |
1417 | } | |
1418 | ||
1419 | static int lockres_remove_mask_waiter(struct ocfs2_lock_res *lockres, | |
1420 | struct ocfs2_mask_waiter *mw) | |
1421 | { | |
1422 | unsigned long flags; | |
1423 | int ret = 0; | |
1424 | ||
1425 | spin_lock_irqsave(&lockres->l_lock, flags); | |
1426 | ret = __lockres_remove_mask_waiter(lockres, mw); | |
ccd979bd MF |
1427 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
1428 | ||
1429 | return ret; | |
1430 | ||
1431 | } | |
1432 | ||
cf8e06f1 MF |
1433 | static int ocfs2_wait_for_mask_interruptible(struct ocfs2_mask_waiter *mw, |
1434 | struct ocfs2_lock_res *lockres) | |
1435 | { | |
1436 | int ret; | |
1437 | ||
1438 | ret = wait_for_completion_interruptible(&mw->mw_complete); | |
1439 | if (ret) | |
1440 | lockres_remove_mask_waiter(lockres, mw); | |
1441 | else | |
1442 | ret = mw->mw_status; | |
1443 | /* Re-arm the completion in case we want to wait on it again */ | |
16735d02 | 1444 | reinit_completion(&mw->mw_complete); |
cf8e06f1 MF |
1445 | return ret; |
1446 | } | |
1447 | ||
cb25797d JK |
1448 | static int __ocfs2_cluster_lock(struct ocfs2_super *osb, |
1449 | struct ocfs2_lock_res *lockres, | |
1450 | int level, | |
1451 | u32 lkm_flags, | |
1452 | int arg_flags, | |
1453 | int l_subclass, | |
1454 | unsigned long caller_ip) | |
ccd979bd MF |
1455 | { |
1456 | struct ocfs2_mask_waiter mw; | |
ccd979bd MF |
1457 | int wait, catch_signals = !(osb->s_mount_opt & OCFS2_MOUNT_NOINTR); |
1458 | int ret = 0; /* gcc doesn't realize wait = 1 guarantees ret is set */ | |
1459 | unsigned long flags; | |
de551246 | 1460 | unsigned int gen; |
1693a5c0 | 1461 | int noqueue_attempted = 0; |
d1e78238 | 1462 | int dlm_locked = 0; |
b1b1e15e | 1463 | int kick_dc = 0; |
ccd979bd | 1464 | |
2f2eca20 | 1465 | if (!(lockres->l_flags & OCFS2_LOCK_INITIALIZED)) { |
1466 | mlog_errno(-EINVAL); | |
1467 | return -EINVAL; | |
1468 | } | |
1469 | ||
ccd979bd MF |
1470 | ocfs2_init_mask_waiter(&mw); |
1471 | ||
b80fc012 | 1472 | if (lockres->l_ops->flags & LOCK_TYPE_USES_LVB) |
bd3e7610 | 1473 | lkm_flags |= DLM_LKF_VALBLK; |
b80fc012 | 1474 | |
ccd979bd MF |
1475 | again: |
1476 | wait = 0; | |
1477 | ||
a1912826 SM |
1478 | spin_lock_irqsave(&lockres->l_lock, flags); |
1479 | ||
ccd979bd MF |
1480 | if (catch_signals && signal_pending(current)) { |
1481 | ret = -ERESTARTSYS; | |
a1912826 | 1482 | goto unlock; |
ccd979bd MF |
1483 | } |
1484 | ||
ccd979bd MF |
1485 | mlog_bug_on_msg(lockres->l_flags & OCFS2_LOCK_FREEING, |
1486 | "Cluster lock called on freeing lockres %s! flags " | |
1487 | "0x%lx\n", lockres->l_name, lockres->l_flags); | |
1488 | ||
1489 | /* We only compare against the currently granted level | |
1490 | * here. If the lock is blocked waiting on a downconvert, | |
1491 | * we'll get caught below. */ | |
1492 | if (lockres->l_flags & OCFS2_LOCK_BUSY && | |
1493 | level > lockres->l_level) { | |
1494 | /* is someone sitting in dlm_lock? If so, wait on | |
1495 | * them. */ | |
1496 | lockres_add_mask_waiter(lockres, &mw, OCFS2_LOCK_BUSY, 0); | |
1497 | wait = 1; | |
1498 | goto unlock; | |
1499 | } | |
1500 | ||
a1912826 SM |
1501 | if (lockres->l_flags & OCFS2_LOCK_UPCONVERT_FINISHING) { |
1502 | /* | |
1503 | * We've upconverted. If the lock now has a level we can | |
1504 | * work with, we take it. If, however, the lock is not at the | |
1505 | * required level, we go thru the full cycle. One way this could | |
1506 | * happen is if a process requesting an upconvert to PR is | |
1507 | * closely followed by another requesting upconvert to an EX. | |
1508 | * If the process requesting EX lands here, we want it to | |
1509 | * continue attempting to upconvert and let the process | |
1510 | * requesting PR take the lock. | |
1511 | * If multiple processes request upconvert to PR, the first one | |
1512 | * here will take the lock. The others will have to go thru the | |
1513 | * OCFS2_LOCK_BLOCKED check to ensure that there is no pending | |
1514 | * downconvert request. | |
1515 | */ | |
1516 | if (level <= lockres->l_level) | |
1517 | goto update_holders; | |
1518 | } | |
1519 | ||
ccd979bd MF |
1520 | if (lockres->l_flags & OCFS2_LOCK_BLOCKED && |
1521 | !ocfs2_may_continue_on_blocked_lock(lockres, level)) { | |
1522 | /* is the lock is currently blocked on behalf of | |
1523 | * another node */ | |
1524 | lockres_add_mask_waiter(lockres, &mw, OCFS2_LOCK_BLOCKED, 0); | |
1525 | wait = 1; | |
1526 | goto unlock; | |
1527 | } | |
1528 | ||
1529 | if (level > lockres->l_level) { | |
1693a5c0 DT |
1530 | if (noqueue_attempted > 0) { |
1531 | ret = -EAGAIN; | |
1532 | goto unlock; | |
1533 | } | |
1534 | if (lkm_flags & DLM_LKF_NOQUEUE) | |
1535 | noqueue_attempted = 1; | |
1536 | ||
ccd979bd MF |
1537 | if (lockres->l_action != OCFS2_AST_INVALID) |
1538 | mlog(ML_ERROR, "lockres %s has action %u pending\n", | |
1539 | lockres->l_name, lockres->l_action); | |
1540 | ||
019d1b22 MF |
1541 | if (!(lockres->l_flags & OCFS2_LOCK_ATTACHED)) { |
1542 | lockres->l_action = OCFS2_AST_ATTACH; | |
bd3e7610 | 1543 | lkm_flags &= ~DLM_LKF_CONVERT; |
019d1b22 MF |
1544 | } else { |
1545 | lockres->l_action = OCFS2_AST_CONVERT; | |
bd3e7610 | 1546 | lkm_flags |= DLM_LKF_CONVERT; |
019d1b22 MF |
1547 | } |
1548 | ||
ccd979bd MF |
1549 | lockres->l_requested = level; |
1550 | lockres_or_flags(lockres, OCFS2_LOCK_BUSY); | |
de551246 | 1551 | gen = lockres_set_pending(lockres); |
ccd979bd MF |
1552 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
1553 | ||
bd3e7610 JB |
1554 | BUG_ON(level == DLM_LOCK_IV); |
1555 | BUG_ON(level == DLM_LOCK_NL); | |
ccd979bd | 1556 | |
9b915181 | 1557 | mlog(ML_BASTS, "lockres %s, convert from %d to %d\n", |
ccd979bd MF |
1558 | lockres->l_name, lockres->l_level, level); |
1559 | ||
1560 | /* call dlm_lock to upgrade lock now */ | |
4670c46d | 1561 | ret = ocfs2_dlm_lock(osb->cconn, |
7431cd7e JB |
1562 | level, |
1563 | &lockres->l_lksb, | |
1564 | lkm_flags, | |
1565 | lockres->l_name, | |
a796d286 | 1566 | OCFS2_LOCK_ID_MAX_LEN - 1); |
de551246 | 1567 | lockres_clear_pending(lockres, gen, osb); |
7431cd7e JB |
1568 | if (ret) { |
1569 | if (!(lkm_flags & DLM_LKF_NOQUEUE) || | |
1570 | (ret != -EAGAIN)) { | |
24ef1815 | 1571 | ocfs2_log_dlm_error("ocfs2_dlm_lock", |
7431cd7e | 1572 | ret, lockres); |
ccd979bd MF |
1573 | } |
1574 | ocfs2_recover_from_dlm_error(lockres, 1); | |
1575 | goto out; | |
1576 | } | |
d1e78238 | 1577 | dlm_locked = 1; |
ccd979bd | 1578 | |
73ac36ea | 1579 | mlog(0, "lock %s, successful return from ocfs2_dlm_lock\n", |
ccd979bd MF |
1580 | lockres->l_name); |
1581 | ||
1582 | /* At this point we've gone inside the dlm and need to | |
1583 | * complete our work regardless. */ | |
1584 | catch_signals = 0; | |
1585 | ||
1586 | /* wait for busy to clear and carry on */ | |
1587 | goto again; | |
1588 | } | |
1589 | ||
a1912826 | 1590 | update_holders: |
ccd979bd MF |
1591 | /* Ok, if we get here then we're good to go. */ |
1592 | ocfs2_inc_holders(lockres, level); | |
1593 | ||
1594 | ret = 0; | |
1595 | unlock: | |
a1912826 SM |
1596 | lockres_clear_flags(lockres, OCFS2_LOCK_UPCONVERT_FINISHING); |
1597 | ||
b1b1e15e TS |
1598 | /* ocfs2_unblock_lock reques on seeing OCFS2_LOCK_UPCONVERT_FINISHING */ |
1599 | kick_dc = (lockres->l_flags & OCFS2_LOCK_BLOCKED); | |
1600 | ||
ccd979bd | 1601 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
b1b1e15e TS |
1602 | if (kick_dc) |
1603 | ocfs2_wake_downconvert_thread(osb); | |
ccd979bd MF |
1604 | out: |
1605 | /* | |
1606 | * This is helping work around a lock inversion between the page lock | |
1607 | * and dlm locks. One path holds the page lock while calling aops | |
1608 | * which block acquiring dlm locks. The voting thread holds dlm | |
1609 | * locks while acquiring page locks while down converting data locks. | |
1610 | * This block is helping an aop path notice the inversion and back | |
1611 | * off to unlock its page lock before trying the dlm lock again. | |
1612 | */ | |
1613 | if (wait && arg_flags & OCFS2_LOCK_NONBLOCK && | |
1614 | mw.mw_mask & (OCFS2_LOCK_BUSY|OCFS2_LOCK_BLOCKED)) { | |
1615 | wait = 0; | |
d1e78238 X |
1616 | spin_lock_irqsave(&lockres->l_lock, flags); |
1617 | if (__lockres_remove_mask_waiter(lockres, &mw)) { | |
1618 | if (dlm_locked) | |
1619 | lockres_or_flags(lockres, | |
1620 | OCFS2_LOCK_NONBLOCK_FINISHED); | |
1621 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
ccd979bd | 1622 | ret = -EAGAIN; |
d1e78238 X |
1623 | } else { |
1624 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
ccd979bd | 1625 | goto again; |
d1e78238 | 1626 | } |
ccd979bd MF |
1627 | } |
1628 | if (wait) { | |
1629 | ret = ocfs2_wait_for_mask(&mw); | |
1630 | if (ret == 0) | |
1631 | goto again; | |
1632 | mlog_errno(ret); | |
1633 | } | |
8ddb7b00 | 1634 | ocfs2_update_lock_stats(lockres, level, &mw, ret); |
ccd979bd | 1635 | |
cb25797d JK |
1636 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
1637 | if (!ret && lockres->l_lockdep_map.key != NULL) { | |
1638 | if (level == DLM_LOCK_PR) | |
1639 | rwsem_acquire_read(&lockres->l_lockdep_map, l_subclass, | |
1640 | !!(arg_flags & OCFS2_META_LOCK_NOQUEUE), | |
1641 | caller_ip); | |
1642 | else | |
1643 | rwsem_acquire(&lockres->l_lockdep_map, l_subclass, | |
1644 | !!(arg_flags & OCFS2_META_LOCK_NOQUEUE), | |
1645 | caller_ip); | |
1646 | } | |
1647 | #endif | |
ccd979bd MF |
1648 | return ret; |
1649 | } | |
1650 | ||
cb25797d JK |
1651 | static inline int ocfs2_cluster_lock(struct ocfs2_super *osb, |
1652 | struct ocfs2_lock_res *lockres, | |
1653 | int level, | |
1654 | u32 lkm_flags, | |
1655 | int arg_flags) | |
1656 | { | |
1657 | return __ocfs2_cluster_lock(osb, lockres, level, lkm_flags, arg_flags, | |
1658 | 0, _RET_IP_); | |
1659 | } | |
1660 | ||
1661 | ||
1662 | static void __ocfs2_cluster_unlock(struct ocfs2_super *osb, | |
1663 | struct ocfs2_lock_res *lockres, | |
1664 | int level, | |
1665 | unsigned long caller_ip) | |
ccd979bd MF |
1666 | { |
1667 | unsigned long flags; | |
1668 | ||
ccd979bd MF |
1669 | spin_lock_irqsave(&lockres->l_lock, flags); |
1670 | ocfs2_dec_holders(lockres, level); | |
34d024f8 | 1671 | ocfs2_downconvert_on_unlock(osb, lockres); |
ccd979bd | 1672 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
cb25797d JK |
1673 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
1674 | if (lockres->l_lockdep_map.key != NULL) | |
1675 | rwsem_release(&lockres->l_lockdep_map, 1, caller_ip); | |
1676 | #endif | |
ccd979bd MF |
1677 | } |
1678 | ||
da66116e AB |
1679 | static int ocfs2_create_new_lock(struct ocfs2_super *osb, |
1680 | struct ocfs2_lock_res *lockres, | |
1681 | int ex, | |
1682 | int local) | |
ccd979bd | 1683 | { |
bd3e7610 | 1684 | int level = ex ? DLM_LOCK_EX : DLM_LOCK_PR; |
ccd979bd | 1685 | unsigned long flags; |
bd3e7610 | 1686 | u32 lkm_flags = local ? DLM_LKF_LOCAL : 0; |
ccd979bd MF |
1687 | |
1688 | spin_lock_irqsave(&lockres->l_lock, flags); | |
1689 | BUG_ON(lockres->l_flags & OCFS2_LOCK_ATTACHED); | |
1690 | lockres_or_flags(lockres, OCFS2_LOCK_LOCAL); | |
1691 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
1692 | ||
24c19ef4 | 1693 | return ocfs2_lock_create(osb, lockres, level, lkm_flags); |
ccd979bd MF |
1694 | } |
1695 | ||
1696 | /* Grants us an EX lock on the data and metadata resources, skipping | |
1697 | * the normal cluster directory lookup. Use this ONLY on newly created | |
1698 | * inodes which other nodes can't possibly see, and which haven't been | |
1699 | * hashed in the inode hash yet. This can give us a good performance | |
1700 | * increase as it'll skip the network broadcast normally associated | |
1701 | * with creating a new lock resource. */ | |
1702 | int ocfs2_create_new_inode_locks(struct inode *inode) | |
1703 | { | |
1704 | int ret; | |
d680efe9 | 1705 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
ccd979bd | 1706 | |
ccd979bd MF |
1707 | BUG_ON(!ocfs2_inode_is_new(inode)); |
1708 | ||
b0697053 | 1709 | mlog(0, "Inode %llu\n", (unsigned long long)OCFS2_I(inode)->ip_blkno); |
ccd979bd MF |
1710 | |
1711 | /* NOTE: That we don't increment any of the holder counts, nor | |
1712 | * do we add anything to a journal handle. Since this is | |
1713 | * supposed to be a new inode which the cluster doesn't know | |
1714 | * about yet, there is no need to. As far as the LVB handling | |
1715 | * is concerned, this is basically like acquiring an EX lock | |
1716 | * on a resource which has an invalid one -- we'll set it | |
1717 | * valid when we release the EX. */ | |
1718 | ||
24c19ef4 | 1719 | ret = ocfs2_create_new_lock(osb, &OCFS2_I(inode)->ip_rw_lockres, 1, 1); |
ccd979bd MF |
1720 | if (ret) { |
1721 | mlog_errno(ret); | |
1722 | goto bail; | |
1723 | } | |
1724 | ||
24c19ef4 | 1725 | /* |
bd3e7610 | 1726 | * We don't want to use DLM_LKF_LOCAL on a meta data lock as they |
24c19ef4 MF |
1727 | * don't use a generation in their lock names. |
1728 | */ | |
e63aecb6 | 1729 | ret = ocfs2_create_new_lock(osb, &OCFS2_I(inode)->ip_inode_lockres, 1, 0); |
ccd979bd MF |
1730 | if (ret) { |
1731 | mlog_errno(ret); | |
1732 | goto bail; | |
1733 | } | |
1734 | ||
50008630 | 1735 | ret = ocfs2_create_new_lock(osb, &OCFS2_I(inode)->ip_open_lockres, 0, 0); |
a8f24f1b | 1736 | if (ret) |
50008630 | 1737 | mlog_errno(ret); |
50008630 | 1738 | |
ccd979bd | 1739 | bail: |
ccd979bd MF |
1740 | return ret; |
1741 | } | |
1742 | ||
1743 | int ocfs2_rw_lock(struct inode *inode, int write) | |
1744 | { | |
1745 | int status, level; | |
1746 | struct ocfs2_lock_res *lockres; | |
c271c5c2 | 1747 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
ccd979bd | 1748 | |
b0697053 MF |
1749 | mlog(0, "inode %llu take %s RW lock\n", |
1750 | (unsigned long long)OCFS2_I(inode)->ip_blkno, | |
ccd979bd MF |
1751 | write ? "EXMODE" : "PRMODE"); |
1752 | ||
c1e8d35e | 1753 | if (ocfs2_mount_local(osb)) |
c271c5c2 SM |
1754 | return 0; |
1755 | ||
ccd979bd MF |
1756 | lockres = &OCFS2_I(inode)->ip_rw_lockres; |
1757 | ||
bd3e7610 | 1758 | level = write ? DLM_LOCK_EX : DLM_LOCK_PR; |
ccd979bd | 1759 | |
1119d3c0 | 1760 | status = ocfs2_cluster_lock(osb, lockres, level, 0, 0); |
ccd979bd MF |
1761 | if (status < 0) |
1762 | mlog_errno(status); | |
1763 | ||
ccd979bd MF |
1764 | return status; |
1765 | } | |
1766 | ||
06e7f13d GH |
1767 | int ocfs2_try_rw_lock(struct inode *inode, int write) |
1768 | { | |
1769 | int status, level; | |
1770 | struct ocfs2_lock_res *lockres; | |
1771 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
1772 | ||
1773 | mlog(0, "inode %llu try to take %s RW lock\n", | |
1774 | (unsigned long long)OCFS2_I(inode)->ip_blkno, | |
1775 | write ? "EXMODE" : "PRMODE"); | |
1776 | ||
1777 | if (ocfs2_mount_local(osb)) | |
1778 | return 0; | |
1779 | ||
1780 | lockres = &OCFS2_I(inode)->ip_rw_lockres; | |
1781 | ||
1782 | level = write ? DLM_LOCK_EX : DLM_LOCK_PR; | |
1783 | ||
1784 | status = ocfs2_cluster_lock(osb, lockres, level, DLM_LKF_NOQUEUE, 0); | |
1785 | return status; | |
1786 | } | |
1787 | ||
ccd979bd MF |
1788 | void ocfs2_rw_unlock(struct inode *inode, int write) |
1789 | { | |
bd3e7610 | 1790 | int level = write ? DLM_LOCK_EX : DLM_LOCK_PR; |
ccd979bd | 1791 | struct ocfs2_lock_res *lockres = &OCFS2_I(inode)->ip_rw_lockres; |
c271c5c2 | 1792 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
ccd979bd | 1793 | |
b0697053 MF |
1794 | mlog(0, "inode %llu drop %s RW lock\n", |
1795 | (unsigned long long)OCFS2_I(inode)->ip_blkno, | |
ccd979bd MF |
1796 | write ? "EXMODE" : "PRMODE"); |
1797 | ||
c271c5c2 | 1798 | if (!ocfs2_mount_local(osb)) |
1119d3c0 | 1799 | ocfs2_cluster_unlock(osb, lockres, level); |
ccd979bd MF |
1800 | } |
1801 | ||
50008630 TY |
1802 | /* |
1803 | * ocfs2_open_lock always get PR mode lock. | |
1804 | */ | |
1805 | int ocfs2_open_lock(struct inode *inode) | |
1806 | { | |
1807 | int status = 0; | |
1808 | struct ocfs2_lock_res *lockres; | |
1809 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
1810 | ||
50008630 TY |
1811 | mlog(0, "inode %llu take PRMODE open lock\n", |
1812 | (unsigned long long)OCFS2_I(inode)->ip_blkno); | |
1813 | ||
03efed8a | 1814 | if (ocfs2_is_hard_readonly(osb) || ocfs2_mount_local(osb)) |
50008630 TY |
1815 | goto out; |
1816 | ||
1817 | lockres = &OCFS2_I(inode)->ip_open_lockres; | |
1818 | ||
1119d3c0 | 1819 | status = ocfs2_cluster_lock(osb, lockres, DLM_LOCK_PR, 0, 0); |
50008630 TY |
1820 | if (status < 0) |
1821 | mlog_errno(status); | |
1822 | ||
1823 | out: | |
50008630 TY |
1824 | return status; |
1825 | } | |
1826 | ||
1827 | int ocfs2_try_open_lock(struct inode *inode, int write) | |
1828 | { | |
1829 | int status = 0, level; | |
1830 | struct ocfs2_lock_res *lockres; | |
1831 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
1832 | ||
50008630 TY |
1833 | mlog(0, "inode %llu try to take %s open lock\n", |
1834 | (unsigned long long)OCFS2_I(inode)->ip_blkno, | |
1835 | write ? "EXMODE" : "PRMODE"); | |
1836 | ||
03efed8a TY |
1837 | if (ocfs2_is_hard_readonly(osb)) { |
1838 | if (write) | |
1839 | status = -EROFS; | |
1840 | goto out; | |
1841 | } | |
1842 | ||
50008630 TY |
1843 | if (ocfs2_mount_local(osb)) |
1844 | goto out; | |
1845 | ||
1846 | lockres = &OCFS2_I(inode)->ip_open_lockres; | |
1847 | ||
bd3e7610 | 1848 | level = write ? DLM_LOCK_EX : DLM_LOCK_PR; |
50008630 TY |
1849 | |
1850 | /* | |
1851 | * The file system may already holding a PRMODE/EXMODE open lock. | |
bd3e7610 | 1852 | * Since we pass DLM_LKF_NOQUEUE, the request won't block waiting on |
50008630 TY |
1853 | * other nodes and the -EAGAIN will indicate to the caller that |
1854 | * this inode is still in use. | |
1855 | */ | |
1119d3c0 | 1856 | status = ocfs2_cluster_lock(osb, lockres, level, DLM_LKF_NOQUEUE, 0); |
50008630 TY |
1857 | |
1858 | out: | |
50008630 TY |
1859 | return status; |
1860 | } | |
1861 | ||
1862 | /* | |
1863 | * ocfs2_open_unlock unlock PR and EX mode open locks. | |
1864 | */ | |
1865 | void ocfs2_open_unlock(struct inode *inode) | |
1866 | { | |
1867 | struct ocfs2_lock_res *lockres = &OCFS2_I(inode)->ip_open_lockres; | |
1868 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
1869 | ||
50008630 TY |
1870 | mlog(0, "inode %llu drop open lock\n", |
1871 | (unsigned long long)OCFS2_I(inode)->ip_blkno); | |
1872 | ||
1873 | if (ocfs2_mount_local(osb)) | |
1874 | goto out; | |
1875 | ||
1876 | if(lockres->l_ro_holders) | |
1119d3c0 | 1877 | ocfs2_cluster_unlock(osb, lockres, DLM_LOCK_PR); |
50008630 | 1878 | if(lockres->l_ex_holders) |
1119d3c0 | 1879 | ocfs2_cluster_unlock(osb, lockres, DLM_LOCK_EX); |
50008630 TY |
1880 | |
1881 | out: | |
c1e8d35e | 1882 | return; |
50008630 TY |
1883 | } |
1884 | ||
cf8e06f1 MF |
1885 | static int ocfs2_flock_handle_signal(struct ocfs2_lock_res *lockres, |
1886 | int level) | |
1887 | { | |
1888 | int ret; | |
1889 | struct ocfs2_super *osb = ocfs2_get_lockres_osb(lockres); | |
1890 | unsigned long flags; | |
1891 | struct ocfs2_mask_waiter mw; | |
1892 | ||
1893 | ocfs2_init_mask_waiter(&mw); | |
1894 | ||
1895 | retry_cancel: | |
1896 | spin_lock_irqsave(&lockres->l_lock, flags); | |
1897 | if (lockres->l_flags & OCFS2_LOCK_BUSY) { | |
1898 | ret = ocfs2_prepare_cancel_convert(osb, lockres); | |
1899 | if (ret) { | |
1900 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
1901 | ret = ocfs2_cancel_convert(osb, lockres); | |
1902 | if (ret < 0) { | |
1903 | mlog_errno(ret); | |
1904 | goto out; | |
1905 | } | |
1906 | goto retry_cancel; | |
1907 | } | |
1908 | lockres_add_mask_waiter(lockres, &mw, OCFS2_LOCK_BUSY, 0); | |
1909 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
1910 | ||
1911 | ocfs2_wait_for_mask(&mw); | |
1912 | goto retry_cancel; | |
1913 | } | |
1914 | ||
1915 | ret = -ERESTARTSYS; | |
1916 | /* | |
1917 | * We may still have gotten the lock, in which case there's no | |
1918 | * point to restarting the syscall. | |
1919 | */ | |
1920 | if (lockres->l_level == level) | |
1921 | ret = 0; | |
1922 | ||
1923 | mlog(0, "Cancel returning %d. flags: 0x%lx, level: %d, act: %d\n", ret, | |
1924 | lockres->l_flags, lockres->l_level, lockres->l_action); | |
1925 | ||
1926 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
1927 | ||
1928 | out: | |
1929 | return ret; | |
1930 | } | |
1931 | ||
1932 | /* | |
1933 | * ocfs2_file_lock() and ocfs2_file_unlock() map to a single pair of | |
1934 | * flock() calls. The locking approach this requires is sufficiently | |
1935 | * different from all other cluster lock types that we implement a | |
3ad2f3fb | 1936 | * separate path to the "low-level" dlm calls. In particular: |
cf8e06f1 MF |
1937 | * |
1938 | * - No optimization of lock levels is done - we take at exactly | |
1939 | * what's been requested. | |
1940 | * | |
1941 | * - No lock caching is employed. We immediately downconvert to | |
1942 | * no-lock at unlock time. This also means flock locks never go on | |
1943 | * the blocking list). | |
1944 | * | |
1945 | * - Since userspace can trivially deadlock itself with flock, we make | |
1946 | * sure to allow cancellation of a misbehaving applications flock() | |
1947 | * request. | |
1948 | * | |
1949 | * - Access to any flock lockres doesn't require concurrency, so we | |
1950 | * can simplify the code by requiring the caller to guarantee | |
1951 | * serialization of dlmglue flock calls. | |
1952 | */ | |
1953 | int ocfs2_file_lock(struct file *file, int ex, int trylock) | |
1954 | { | |
e988cf1c MF |
1955 | int ret, level = ex ? DLM_LOCK_EX : DLM_LOCK_PR; |
1956 | unsigned int lkm_flags = trylock ? DLM_LKF_NOQUEUE : 0; | |
cf8e06f1 MF |
1957 | unsigned long flags; |
1958 | struct ocfs2_file_private *fp = file->private_data; | |
1959 | struct ocfs2_lock_res *lockres = &fp->fp_flock; | |
1960 | struct ocfs2_super *osb = OCFS2_SB(file->f_mapping->host->i_sb); | |
1961 | struct ocfs2_mask_waiter mw; | |
1962 | ||
1963 | ocfs2_init_mask_waiter(&mw); | |
1964 | ||
1965 | if ((lockres->l_flags & OCFS2_LOCK_BUSY) || | |
bd3e7610 | 1966 | (lockres->l_level > DLM_LOCK_NL)) { |
cf8e06f1 MF |
1967 | mlog(ML_ERROR, |
1968 | "File lock \"%s\" has busy or locked state: flags: 0x%lx, " | |
1969 | "level: %u\n", lockres->l_name, lockres->l_flags, | |
1970 | lockres->l_level); | |
1971 | return -EINVAL; | |
1972 | } | |
1973 | ||
1974 | spin_lock_irqsave(&lockres->l_lock, flags); | |
1975 | if (!(lockres->l_flags & OCFS2_LOCK_ATTACHED)) { | |
1976 | lockres_add_mask_waiter(lockres, &mw, OCFS2_LOCK_BUSY, 0); | |
1977 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
1978 | ||
1979 | /* | |
1980 | * Get the lock at NLMODE to start - that way we | |
1981 | * can cancel the upconvert request if need be. | |
1982 | */ | |
e988cf1c | 1983 | ret = ocfs2_lock_create(osb, lockres, DLM_LOCK_NL, 0); |
cf8e06f1 MF |
1984 | if (ret < 0) { |
1985 | mlog_errno(ret); | |
1986 | goto out; | |
1987 | } | |
1988 | ||
1989 | ret = ocfs2_wait_for_mask(&mw); | |
1990 | if (ret) { | |
1991 | mlog_errno(ret); | |
1992 | goto out; | |
1993 | } | |
1994 | spin_lock_irqsave(&lockres->l_lock, flags); | |
1995 | } | |
1996 | ||
1997 | lockres->l_action = OCFS2_AST_CONVERT; | |
e988cf1c | 1998 | lkm_flags |= DLM_LKF_CONVERT; |
cf8e06f1 MF |
1999 | lockres->l_requested = level; |
2000 | lockres_or_flags(lockres, OCFS2_LOCK_BUSY); | |
2001 | ||
2002 | lockres_add_mask_waiter(lockres, &mw, OCFS2_LOCK_BUSY, 0); | |
2003 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
2004 | ||
4670c46d | 2005 | ret = ocfs2_dlm_lock(osb->cconn, level, &lockres->l_lksb, lkm_flags, |
a796d286 | 2006 | lockres->l_name, OCFS2_LOCK_ID_MAX_LEN - 1); |
7431cd7e JB |
2007 | if (ret) { |
2008 | if (!trylock || (ret != -EAGAIN)) { | |
24ef1815 | 2009 | ocfs2_log_dlm_error("ocfs2_dlm_lock", ret, lockres); |
cf8e06f1 MF |
2010 | ret = -EINVAL; |
2011 | } | |
2012 | ||
2013 | ocfs2_recover_from_dlm_error(lockres, 1); | |
2014 | lockres_remove_mask_waiter(lockres, &mw); | |
2015 | goto out; | |
2016 | } | |
2017 | ||
2018 | ret = ocfs2_wait_for_mask_interruptible(&mw, lockres); | |
2019 | if (ret == -ERESTARTSYS) { | |
2020 | /* | |
2021 | * Userspace can cause deadlock itself with | |
2022 | * flock(). Current behavior locally is to allow the | |
2023 | * deadlock, but abort the system call if a signal is | |
2024 | * received. We follow this example, otherwise a | |
2025 | * poorly written program could sit in kernel until | |
2026 | * reboot. | |
2027 | * | |
2028 | * Handling this is a bit more complicated for Ocfs2 | |
2029 | * though. We can't exit this function with an | |
2030 | * outstanding lock request, so a cancel convert is | |
2031 | * required. We intentionally overwrite 'ret' - if the | |
2032 | * cancel fails and the lock was granted, it's easier | |
af901ca1 | 2033 | * to just bubble success back up to the user. |
cf8e06f1 MF |
2034 | */ |
2035 | ret = ocfs2_flock_handle_signal(lockres, level); | |
1693a5c0 DT |
2036 | } else if (!ret && (level > lockres->l_level)) { |
2037 | /* Trylock failed asynchronously */ | |
2038 | BUG_ON(!trylock); | |
2039 | ret = -EAGAIN; | |
cf8e06f1 MF |
2040 | } |
2041 | ||
2042 | out: | |
2043 | ||
2044 | mlog(0, "Lock: \"%s\" ex: %d, trylock: %d, returns: %d\n", | |
2045 | lockres->l_name, ex, trylock, ret); | |
2046 | return ret; | |
2047 | } | |
2048 | ||
2049 | void ocfs2_file_unlock(struct file *file) | |
2050 | { | |
2051 | int ret; | |
de551246 | 2052 | unsigned int gen; |
cf8e06f1 MF |
2053 | unsigned long flags; |
2054 | struct ocfs2_file_private *fp = file->private_data; | |
2055 | struct ocfs2_lock_res *lockres = &fp->fp_flock; | |
2056 | struct ocfs2_super *osb = OCFS2_SB(file->f_mapping->host->i_sb); | |
2057 | struct ocfs2_mask_waiter mw; | |
2058 | ||
2059 | ocfs2_init_mask_waiter(&mw); | |
2060 | ||
2061 | if (!(lockres->l_flags & OCFS2_LOCK_ATTACHED)) | |
2062 | return; | |
2063 | ||
e988cf1c | 2064 | if (lockres->l_level == DLM_LOCK_NL) |
cf8e06f1 MF |
2065 | return; |
2066 | ||
2067 | mlog(0, "Unlock: \"%s\" flags: 0x%lx, level: %d, act: %d\n", | |
2068 | lockres->l_name, lockres->l_flags, lockres->l_level, | |
2069 | lockres->l_action); | |
2070 | ||
2071 | spin_lock_irqsave(&lockres->l_lock, flags); | |
2072 | /* | |
2073 | * Fake a blocking ast for the downconvert code. | |
2074 | */ | |
2075 | lockres_or_flags(lockres, OCFS2_LOCK_BLOCKED); | |
bd3e7610 | 2076 | lockres->l_blocking = DLM_LOCK_EX; |
cf8e06f1 | 2077 | |
e988cf1c | 2078 | gen = ocfs2_prepare_downconvert(lockres, DLM_LOCK_NL); |
cf8e06f1 MF |
2079 | lockres_add_mask_waiter(lockres, &mw, OCFS2_LOCK_BUSY, 0); |
2080 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
2081 | ||
e988cf1c | 2082 | ret = ocfs2_downconvert_lock(osb, lockres, DLM_LOCK_NL, 0, gen); |
cf8e06f1 MF |
2083 | if (ret) { |
2084 | mlog_errno(ret); | |
2085 | return; | |
2086 | } | |
2087 | ||
2088 | ret = ocfs2_wait_for_mask(&mw); | |
2089 | if (ret) | |
2090 | mlog_errno(ret); | |
2091 | } | |
2092 | ||
34d024f8 MF |
2093 | static void ocfs2_downconvert_on_unlock(struct ocfs2_super *osb, |
2094 | struct ocfs2_lock_res *lockres) | |
ccd979bd MF |
2095 | { |
2096 | int kick = 0; | |
2097 | ||
ccd979bd | 2098 | /* If we know that another node is waiting on our lock, kick |
34d024f8 | 2099 | * the downconvert thread * pre-emptively when we reach a release |
ccd979bd MF |
2100 | * condition. */ |
2101 | if (lockres->l_flags & OCFS2_LOCK_BLOCKED) { | |
2102 | switch(lockres->l_blocking) { | |
bd3e7610 | 2103 | case DLM_LOCK_EX: |
ccd979bd MF |
2104 | if (!lockres->l_ex_holders && !lockres->l_ro_holders) |
2105 | kick = 1; | |
2106 | break; | |
bd3e7610 | 2107 | case DLM_LOCK_PR: |
ccd979bd MF |
2108 | if (!lockres->l_ex_holders) |
2109 | kick = 1; | |
2110 | break; | |
2111 | default: | |
2112 | BUG(); | |
2113 | } | |
2114 | } | |
2115 | ||
2116 | if (kick) | |
34d024f8 | 2117 | ocfs2_wake_downconvert_thread(osb); |
ccd979bd MF |
2118 | } |
2119 | ||
ccd979bd MF |
2120 | #define OCFS2_SEC_BITS 34 |
2121 | #define OCFS2_SEC_SHIFT (64 - 34) | |
2122 | #define OCFS2_NSEC_MASK ((1ULL << OCFS2_SEC_SHIFT) - 1) | |
2123 | ||
2124 | /* LVB only has room for 64 bits of time here so we pack it for | |
2125 | * now. */ | |
2126 | static u64 ocfs2_pack_timespec(struct timespec *spec) | |
2127 | { | |
2128 | u64 res; | |
2129 | u64 sec = spec->tv_sec; | |
2130 | u32 nsec = spec->tv_nsec; | |
2131 | ||
2132 | res = (sec << OCFS2_SEC_SHIFT) | (nsec & OCFS2_NSEC_MASK); | |
2133 | ||
2134 | return res; | |
2135 | } | |
2136 | ||
2137 | /* Call this with the lockres locked. I am reasonably sure we don't | |
2138 | * need ip_lock in this function as anyone who would be changing those | |
e63aecb6 | 2139 | * values is supposed to be blocked in ocfs2_inode_lock right now. */ |
ccd979bd MF |
2140 | static void __ocfs2_stuff_meta_lvb(struct inode *inode) |
2141 | { | |
2142 | struct ocfs2_inode_info *oi = OCFS2_I(inode); | |
e63aecb6 | 2143 | struct ocfs2_lock_res *lockres = &oi->ip_inode_lockres; |
ccd979bd | 2144 | struct ocfs2_meta_lvb *lvb; |
95582b00 | 2145 | struct timespec ts; |
ccd979bd | 2146 | |
a641dc2a | 2147 | lvb = ocfs2_dlm_lvb(&lockres->l_lksb); |
ccd979bd | 2148 | |
24c19ef4 MF |
2149 | /* |
2150 | * Invalidate the LVB of a deleted inode - this way other | |
2151 | * nodes are forced to go to disk and discover the new inode | |
2152 | * status. | |
2153 | */ | |
2154 | if (oi->ip_flags & OCFS2_INODE_DELETED) { | |
2155 | lvb->lvb_version = 0; | |
2156 | goto out; | |
2157 | } | |
2158 | ||
4d3b83f7 | 2159 | lvb->lvb_version = OCFS2_LVB_VERSION; |
ccd979bd MF |
2160 | lvb->lvb_isize = cpu_to_be64(i_size_read(inode)); |
2161 | lvb->lvb_iclusters = cpu_to_be32(oi->ip_clusters); | |
03ab30f7 EB |
2162 | lvb->lvb_iuid = cpu_to_be32(i_uid_read(inode)); |
2163 | lvb->lvb_igid = cpu_to_be32(i_gid_read(inode)); | |
ccd979bd MF |
2164 | lvb->lvb_imode = cpu_to_be16(inode->i_mode); |
2165 | lvb->lvb_inlink = cpu_to_be16(inode->i_nlink); | |
95582b00 | 2166 | ts = timespec64_to_timespec(inode->i_atime); |
ccd979bd | 2167 | lvb->lvb_iatime_packed = |
95582b00 DD |
2168 | cpu_to_be64(ocfs2_pack_timespec(&ts)); |
2169 | ts = timespec64_to_timespec(inode->i_ctime); | |
ccd979bd | 2170 | lvb->lvb_ictime_packed = |
95582b00 DD |
2171 | cpu_to_be64(ocfs2_pack_timespec(&ts)); |
2172 | ts = timespec64_to_timespec(inode->i_mtime); | |
ccd979bd | 2173 | lvb->lvb_imtime_packed = |
95582b00 | 2174 | cpu_to_be64(ocfs2_pack_timespec(&ts)); |
ca4d147e | 2175 | lvb->lvb_iattr = cpu_to_be32(oi->ip_attr); |
15b1e36b | 2176 | lvb->lvb_idynfeatures = cpu_to_be16(oi->ip_dyn_features); |
f9e2d82e | 2177 | lvb->lvb_igeneration = cpu_to_be32(inode->i_generation); |
ccd979bd | 2178 | |
24c19ef4 | 2179 | out: |
ccd979bd | 2180 | mlog_meta_lvb(0, lockres); |
ccd979bd MF |
2181 | } |
2182 | ||
2183 | static void ocfs2_unpack_timespec(struct timespec *spec, | |
2184 | u64 packed_time) | |
2185 | { | |
2186 | spec->tv_sec = packed_time >> OCFS2_SEC_SHIFT; | |
2187 | spec->tv_nsec = packed_time & OCFS2_NSEC_MASK; | |
2188 | } | |
2189 | ||
2190 | static void ocfs2_refresh_inode_from_lvb(struct inode *inode) | |
2191 | { | |
95582b00 | 2192 | struct timespec ts; |
ccd979bd | 2193 | struct ocfs2_inode_info *oi = OCFS2_I(inode); |
e63aecb6 | 2194 | struct ocfs2_lock_res *lockres = &oi->ip_inode_lockres; |
ccd979bd MF |
2195 | struct ocfs2_meta_lvb *lvb; |
2196 | ||
ccd979bd MF |
2197 | mlog_meta_lvb(0, lockres); |
2198 | ||
a641dc2a | 2199 | lvb = ocfs2_dlm_lvb(&lockres->l_lksb); |
ccd979bd MF |
2200 | |
2201 | /* We're safe here without the lockres lock... */ | |
2202 | spin_lock(&oi->ip_lock); | |
2203 | oi->ip_clusters = be32_to_cpu(lvb->lvb_iclusters); | |
2204 | i_size_write(inode, be64_to_cpu(lvb->lvb_isize)); | |
2205 | ||
ca4d147e | 2206 | oi->ip_attr = be32_to_cpu(lvb->lvb_iattr); |
15b1e36b | 2207 | oi->ip_dyn_features = be16_to_cpu(lvb->lvb_idynfeatures); |
ca4d147e HP |
2208 | ocfs2_set_inode_flags(inode); |
2209 | ||
ccd979bd MF |
2210 | /* fast-symlinks are a special case */ |
2211 | if (S_ISLNK(inode->i_mode) && !oi->ip_clusters) | |
2212 | inode->i_blocks = 0; | |
2213 | else | |
8110b073 | 2214 | inode->i_blocks = ocfs2_inode_sector_count(inode); |
ccd979bd | 2215 | |
03ab30f7 EB |
2216 | i_uid_write(inode, be32_to_cpu(lvb->lvb_iuid)); |
2217 | i_gid_write(inode, be32_to_cpu(lvb->lvb_igid)); | |
ccd979bd | 2218 | inode->i_mode = be16_to_cpu(lvb->lvb_imode); |
bfe86848 | 2219 | set_nlink(inode, be16_to_cpu(lvb->lvb_inlink)); |
95582b00 | 2220 | ocfs2_unpack_timespec(&ts, |
ccd979bd | 2221 | be64_to_cpu(lvb->lvb_iatime_packed)); |
95582b00 DD |
2222 | inode->i_atime = timespec_to_timespec64(ts); |
2223 | ocfs2_unpack_timespec(&ts, | |
ccd979bd | 2224 | be64_to_cpu(lvb->lvb_imtime_packed)); |
95582b00 DD |
2225 | inode->i_mtime = timespec_to_timespec64(ts); |
2226 | ocfs2_unpack_timespec(&ts, | |
ccd979bd | 2227 | be64_to_cpu(lvb->lvb_ictime_packed)); |
95582b00 | 2228 | inode->i_ctime = timespec_to_timespec64(ts); |
ccd979bd | 2229 | spin_unlock(&oi->ip_lock); |
ccd979bd MF |
2230 | } |
2231 | ||
f9e2d82e MF |
2232 | static inline int ocfs2_meta_lvb_is_trustable(struct inode *inode, |
2233 | struct ocfs2_lock_res *lockres) | |
ccd979bd | 2234 | { |
a641dc2a | 2235 | struct ocfs2_meta_lvb *lvb = ocfs2_dlm_lvb(&lockres->l_lksb); |
ccd979bd | 2236 | |
1c520dfb JB |
2237 | if (ocfs2_dlm_lvb_valid(&lockres->l_lksb) |
2238 | && lvb->lvb_version == OCFS2_LVB_VERSION | |
f9e2d82e | 2239 | && be32_to_cpu(lvb->lvb_igeneration) == inode->i_generation) |
ccd979bd MF |
2240 | return 1; |
2241 | return 0; | |
2242 | } | |
2243 | ||
2244 | /* Determine whether a lock resource needs to be refreshed, and | |
2245 | * arbitrate who gets to refresh it. | |
2246 | * | |
2247 | * 0 means no refresh needed. | |
2248 | * | |
2249 | * > 0 means you need to refresh this and you MUST call | |
2250 | * ocfs2_complete_lock_res_refresh afterwards. */ | |
2251 | static int ocfs2_should_refresh_lock_res(struct ocfs2_lock_res *lockres) | |
2252 | { | |
2253 | unsigned long flags; | |
2254 | int status = 0; | |
2255 | ||
ccd979bd MF |
2256 | refresh_check: |
2257 | spin_lock_irqsave(&lockres->l_lock, flags); | |
2258 | if (!(lockres->l_flags & OCFS2_LOCK_NEEDS_REFRESH)) { | |
2259 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
2260 | goto bail; | |
2261 | } | |
2262 | ||
2263 | if (lockres->l_flags & OCFS2_LOCK_REFRESHING) { | |
2264 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
2265 | ||
2266 | ocfs2_wait_on_refreshing_lock(lockres); | |
2267 | goto refresh_check; | |
2268 | } | |
2269 | ||
2270 | /* Ok, I'll be the one to refresh this lock. */ | |
2271 | lockres_or_flags(lockres, OCFS2_LOCK_REFRESHING); | |
2272 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
2273 | ||
2274 | status = 1; | |
2275 | bail: | |
c1e8d35e | 2276 | mlog(0, "status %d\n", status); |
ccd979bd MF |
2277 | return status; |
2278 | } | |
2279 | ||
2280 | /* If status is non zero, I'll mark it as not being in refresh | |
2281 | * anymroe, but i won't clear the needs refresh flag. */ | |
2282 | static inline void ocfs2_complete_lock_res_refresh(struct ocfs2_lock_res *lockres, | |
2283 | int status) | |
2284 | { | |
2285 | unsigned long flags; | |
ccd979bd MF |
2286 | |
2287 | spin_lock_irqsave(&lockres->l_lock, flags); | |
2288 | lockres_clear_flags(lockres, OCFS2_LOCK_REFRESHING); | |
2289 | if (!status) | |
2290 | lockres_clear_flags(lockres, OCFS2_LOCK_NEEDS_REFRESH); | |
2291 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
2292 | ||
2293 | wake_up(&lockres->l_event); | |
ccd979bd MF |
2294 | } |
2295 | ||
2296 | /* may or may not return a bh if it went to disk. */ | |
e63aecb6 | 2297 | static int ocfs2_inode_lock_update(struct inode *inode, |
ccd979bd MF |
2298 | struct buffer_head **bh) |
2299 | { | |
2300 | int status = 0; | |
2301 | struct ocfs2_inode_info *oi = OCFS2_I(inode); | |
e63aecb6 | 2302 | struct ocfs2_lock_res *lockres = &oi->ip_inode_lockres; |
ccd979bd | 2303 | struct ocfs2_dinode *fe; |
c271c5c2 | 2304 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
ccd979bd | 2305 | |
be9e986b MF |
2306 | if (ocfs2_mount_local(osb)) |
2307 | goto bail; | |
2308 | ||
ccd979bd MF |
2309 | spin_lock(&oi->ip_lock); |
2310 | if (oi->ip_flags & OCFS2_INODE_DELETED) { | |
b0697053 | 2311 | mlog(0, "Orphaned inode %llu was deleted while we " |
ccd979bd | 2312 | "were waiting on a lock. ip_flags = 0x%x\n", |
b0697053 | 2313 | (unsigned long long)oi->ip_blkno, oi->ip_flags); |
ccd979bd MF |
2314 | spin_unlock(&oi->ip_lock); |
2315 | status = -ENOENT; | |
2316 | goto bail; | |
2317 | } | |
2318 | spin_unlock(&oi->ip_lock); | |
2319 | ||
be9e986b MF |
2320 | if (!ocfs2_should_refresh_lock_res(lockres)) |
2321 | goto bail; | |
ccd979bd MF |
2322 | |
2323 | /* This will discard any caching information we might have had | |
2324 | * for the inode metadata. */ | |
8cb471e8 | 2325 | ocfs2_metadata_cache_purge(INODE_CACHE(inode)); |
ccd979bd | 2326 | |
83418978 MF |
2327 | ocfs2_extent_map_trunc(inode, 0); |
2328 | ||
be9e986b | 2329 | if (ocfs2_meta_lvb_is_trustable(inode, lockres)) { |
b0697053 MF |
2330 | mlog(0, "Trusting LVB on inode %llu\n", |
2331 | (unsigned long long)oi->ip_blkno); | |
ccd979bd MF |
2332 | ocfs2_refresh_inode_from_lvb(inode); |
2333 | } else { | |
2334 | /* Boo, we have to go to disk. */ | |
2335 | /* read bh, cast, ocfs2_refresh_inode */ | |
b657c95c | 2336 | status = ocfs2_read_inode_block(inode, bh); |
ccd979bd MF |
2337 | if (status < 0) { |
2338 | mlog_errno(status); | |
2339 | goto bail_refresh; | |
2340 | } | |
2341 | fe = (struct ocfs2_dinode *) (*bh)->b_data; | |
2342 | ||
2343 | /* This is a good chance to make sure we're not | |
b657c95c JB |
2344 | * locking an invalid object. ocfs2_read_inode_block() |
2345 | * already checked that the inode block is sane. | |
ccd979bd MF |
2346 | * |
2347 | * We bug on a stale inode here because we checked | |
2348 | * above whether it was wiped from disk. The wiping | |
2349 | * node provides a guarantee that we receive that | |
2350 | * message and can mark the inode before dropping any | |
2351 | * locks associated with it. */ | |
ccd979bd MF |
2352 | mlog_bug_on_msg(inode->i_generation != |
2353 | le32_to_cpu(fe->i_generation), | |
b0697053 | 2354 | "Invalid dinode %llu disk generation: %u " |
ccd979bd | 2355 | "inode->i_generation: %u\n", |
b0697053 MF |
2356 | (unsigned long long)oi->ip_blkno, |
2357 | le32_to_cpu(fe->i_generation), | |
ccd979bd MF |
2358 | inode->i_generation); |
2359 | mlog_bug_on_msg(le64_to_cpu(fe->i_dtime) || | |
2360 | !(fe->i_flags & cpu_to_le32(OCFS2_VALID_FL)), | |
b0697053 MF |
2361 | "Stale dinode %llu dtime: %llu flags: 0x%x\n", |
2362 | (unsigned long long)oi->ip_blkno, | |
2363 | (unsigned long long)le64_to_cpu(fe->i_dtime), | |
ccd979bd MF |
2364 | le32_to_cpu(fe->i_flags)); |
2365 | ||
2366 | ocfs2_refresh_inode(inode, fe); | |
8ddb7b00 | 2367 | ocfs2_track_lock_refresh(lockres); |
ccd979bd MF |
2368 | } |
2369 | ||
2370 | status = 0; | |
2371 | bail_refresh: | |
be9e986b | 2372 | ocfs2_complete_lock_res_refresh(lockres, status); |
ccd979bd | 2373 | bail: |
ccd979bd MF |
2374 | return status; |
2375 | } | |
2376 | ||
2377 | static int ocfs2_assign_bh(struct inode *inode, | |
2378 | struct buffer_head **ret_bh, | |
2379 | struct buffer_head *passed_bh) | |
2380 | { | |
2381 | int status; | |
2382 | ||
2383 | if (passed_bh) { | |
2384 | /* Ok, the update went to disk for us, use the | |
2385 | * returned bh. */ | |
2386 | *ret_bh = passed_bh; | |
2387 | get_bh(*ret_bh); | |
2388 | ||
2389 | return 0; | |
2390 | } | |
2391 | ||
b657c95c | 2392 | status = ocfs2_read_inode_block(inode, ret_bh); |
ccd979bd MF |
2393 | if (status < 0) |
2394 | mlog_errno(status); | |
2395 | ||
2396 | return status; | |
2397 | } | |
2398 | ||
2399 | /* | |
2400 | * returns < 0 error if the callback will never be called, otherwise | |
2401 | * the result of the lock will be communicated via the callback. | |
2402 | */ | |
cb25797d JK |
2403 | int ocfs2_inode_lock_full_nested(struct inode *inode, |
2404 | struct buffer_head **ret_bh, | |
2405 | int ex, | |
2406 | int arg_flags, | |
2407 | int subclass) | |
ccd979bd | 2408 | { |
bd3e7610 JB |
2409 | int status, level, acquired; |
2410 | u32 dlm_flags; | |
c271c5c2 | 2411 | struct ocfs2_lock_res *lockres = NULL; |
ccd979bd MF |
2412 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
2413 | struct buffer_head *local_bh = NULL; | |
2414 | ||
b0697053 MF |
2415 | mlog(0, "inode %llu, take %s META lock\n", |
2416 | (unsigned long long)OCFS2_I(inode)->ip_blkno, | |
ccd979bd MF |
2417 | ex ? "EXMODE" : "PRMODE"); |
2418 | ||
2419 | status = 0; | |
2420 | acquired = 0; | |
2421 | /* We'll allow faking a readonly metadata lock for | |
2422 | * rodevices. */ | |
2423 | if (ocfs2_is_hard_readonly(osb)) { | |
2424 | if (ex) | |
2425 | status = -EROFS; | |
03efed8a | 2426 | goto getbh; |
ccd979bd MF |
2427 | } |
2428 | ||
439a36b8 ER |
2429 | if ((arg_flags & OCFS2_META_LOCK_GETBH) || |
2430 | ocfs2_mount_local(osb)) | |
2431 | goto update; | |
c271c5c2 | 2432 | |
ccd979bd | 2433 | if (!(arg_flags & OCFS2_META_LOCK_RECOVERY)) |
553abd04 | 2434 | ocfs2_wait_for_recovery(osb); |
ccd979bd | 2435 | |
e63aecb6 | 2436 | lockres = &OCFS2_I(inode)->ip_inode_lockres; |
bd3e7610 | 2437 | level = ex ? DLM_LOCK_EX : DLM_LOCK_PR; |
ccd979bd MF |
2438 | dlm_flags = 0; |
2439 | if (arg_flags & OCFS2_META_LOCK_NOQUEUE) | |
bd3e7610 | 2440 | dlm_flags |= DLM_LKF_NOQUEUE; |
ccd979bd | 2441 | |
cb25797d JK |
2442 | status = __ocfs2_cluster_lock(osb, lockres, level, dlm_flags, |
2443 | arg_flags, subclass, _RET_IP_); | |
ccd979bd | 2444 | if (status < 0) { |
41003a7b | 2445 | if (status != -EAGAIN) |
ccd979bd MF |
2446 | mlog_errno(status); |
2447 | goto bail; | |
2448 | } | |
2449 | ||
2450 | /* Notify the error cleanup path to drop the cluster lock. */ | |
2451 | acquired = 1; | |
2452 | ||
2453 | /* We wait twice because a node may have died while we were in | |
2454 | * the lower dlm layers. The second time though, we've | |
2455 | * committed to owning this lock so we don't allow signals to | |
2456 | * abort the operation. */ | |
2457 | if (!(arg_flags & OCFS2_META_LOCK_RECOVERY)) | |
553abd04 | 2458 | ocfs2_wait_for_recovery(osb); |
ccd979bd | 2459 | |
439a36b8 | 2460 | update: |
24c19ef4 MF |
2461 | /* |
2462 | * We only see this flag if we're being called from | |
2463 | * ocfs2_read_locked_inode(). It means we're locking an inode | |
2464 | * which hasn't been populated yet, so clear the refresh flag | |
2465 | * and let the caller handle it. | |
2466 | */ | |
2467 | if (inode->i_state & I_NEW) { | |
2468 | status = 0; | |
c271c5c2 SM |
2469 | if (lockres) |
2470 | ocfs2_complete_lock_res_refresh(lockres, 0); | |
24c19ef4 MF |
2471 | goto bail; |
2472 | } | |
2473 | ||
ccd979bd | 2474 | /* This is fun. The caller may want a bh back, or it may |
e63aecb6 | 2475 | * not. ocfs2_inode_lock_update definitely wants one in, but |
ccd979bd MF |
2476 | * may or may not read one, depending on what's in the |
2477 | * LVB. The result of all of this is that we've *only* gone to | |
2478 | * disk if we have to, so the complexity is worthwhile. */ | |
e63aecb6 | 2479 | status = ocfs2_inode_lock_update(inode, &local_bh); |
ccd979bd MF |
2480 | if (status < 0) { |
2481 | if (status != -ENOENT) | |
2482 | mlog_errno(status); | |
2483 | goto bail; | |
2484 | } | |
03efed8a | 2485 | getbh: |
ccd979bd MF |
2486 | if (ret_bh) { |
2487 | status = ocfs2_assign_bh(inode, ret_bh, local_bh); | |
2488 | if (status < 0) { | |
2489 | mlog_errno(status); | |
2490 | goto bail; | |
2491 | } | |
2492 | } | |
2493 | ||
ccd979bd MF |
2494 | bail: |
2495 | if (status < 0) { | |
2496 | if (ret_bh && (*ret_bh)) { | |
2497 | brelse(*ret_bh); | |
2498 | *ret_bh = NULL; | |
2499 | } | |
2500 | if (acquired) | |
e63aecb6 | 2501 | ocfs2_inode_unlock(inode, ex); |
ccd979bd MF |
2502 | } |
2503 | ||
2504 | if (local_bh) | |
2505 | brelse(local_bh); | |
2506 | ||
ccd979bd MF |
2507 | return status; |
2508 | } | |
2509 | ||
2510 | /* | |
34d024f8 MF |
2511 | * This is working around a lock inversion between tasks acquiring DLM |
2512 | * locks while holding a page lock and the downconvert thread which | |
2513 | * blocks dlm lock acquiry while acquiring page locks. | |
ccd979bd MF |
2514 | * |
2515 | * ** These _with_page variantes are only intended to be called from aop | |
2516 | * methods that hold page locks and return a very specific *positive* error | |
2517 | * code that aop methods pass up to the VFS -- test for errors with != 0. ** | |
2518 | * | |
34d024f8 MF |
2519 | * The DLM is called such that it returns -EAGAIN if it would have |
2520 | * blocked waiting for the downconvert thread. In that case we unlock | |
2521 | * our page so the downconvert thread can make progress. Once we've | |
2522 | * done this we have to return AOP_TRUNCATED_PAGE so the aop method | |
2523 | * that called us can bubble that back up into the VFS who will then | |
2524 | * immediately retry the aop call. | |
ccd979bd | 2525 | */ |
e63aecb6 | 2526 | int ocfs2_inode_lock_with_page(struct inode *inode, |
ccd979bd MF |
2527 | struct buffer_head **ret_bh, |
2528 | int ex, | |
2529 | struct page *page) | |
2530 | { | |
2531 | int ret; | |
2532 | ||
e63aecb6 | 2533 | ret = ocfs2_inode_lock_full(inode, ret_bh, ex, OCFS2_LOCK_NONBLOCK); |
ccd979bd MF |
2534 | if (ret == -EAGAIN) { |
2535 | unlock_page(page); | |
ff26cc10 GH |
2536 | /* |
2537 | * If we can't get inode lock immediately, we should not return | |
2538 | * directly here, since this will lead to a softlockup problem. | |
2539 | * The method is to get a blocking lock and immediately unlock | |
2540 | * before returning, this can avoid CPU resource waste due to | |
2541 | * lots of retries, and benefits fairness in getting lock. | |
2542 | */ | |
2543 | if (ocfs2_inode_lock(inode, ret_bh, ex) == 0) | |
2544 | ocfs2_inode_unlock(inode, ex); | |
ccd979bd MF |
2545 | ret = AOP_TRUNCATED_PAGE; |
2546 | } | |
2547 | ||
2548 | return ret; | |
2549 | } | |
2550 | ||
e63aecb6 | 2551 | int ocfs2_inode_lock_atime(struct inode *inode, |
7f1a37e3 | 2552 | struct vfsmount *vfsmnt, |
c4c2416a | 2553 | int *level, int wait) |
7f1a37e3 TY |
2554 | { |
2555 | int ret; | |
2556 | ||
c4c2416a GH |
2557 | if (wait) |
2558 | ret = ocfs2_inode_lock(inode, NULL, 0); | |
2559 | else | |
2560 | ret = ocfs2_try_inode_lock(inode, NULL, 0); | |
2561 | ||
7f1a37e3 | 2562 | if (ret < 0) { |
c4c2416a GH |
2563 | if (ret != -EAGAIN) |
2564 | mlog_errno(ret); | |
7f1a37e3 TY |
2565 | return ret; |
2566 | } | |
2567 | ||
2568 | /* | |
2569 | * If we should update atime, we will get EX lock, | |
2570 | * otherwise we just get PR lock. | |
2571 | */ | |
2572 | if (ocfs2_should_update_atime(inode, vfsmnt)) { | |
2573 | struct buffer_head *bh = NULL; | |
2574 | ||
e63aecb6 | 2575 | ocfs2_inode_unlock(inode, 0); |
c4c2416a GH |
2576 | if (wait) |
2577 | ret = ocfs2_inode_lock(inode, &bh, 1); | |
2578 | else | |
2579 | ret = ocfs2_try_inode_lock(inode, &bh, 1); | |
2580 | ||
7f1a37e3 | 2581 | if (ret < 0) { |
c4c2416a GH |
2582 | if (ret != -EAGAIN) |
2583 | mlog_errno(ret); | |
7f1a37e3 TY |
2584 | return ret; |
2585 | } | |
2586 | *level = 1; | |
2587 | if (ocfs2_should_update_atime(inode, vfsmnt)) | |
2588 | ocfs2_update_inode_atime(inode, bh); | |
2589 | if (bh) | |
2590 | brelse(bh); | |
2591 | } else | |
2592 | *level = 0; | |
2593 | ||
7f1a37e3 TY |
2594 | return ret; |
2595 | } | |
2596 | ||
e63aecb6 | 2597 | void ocfs2_inode_unlock(struct inode *inode, |
ccd979bd MF |
2598 | int ex) |
2599 | { | |
bd3e7610 | 2600 | int level = ex ? DLM_LOCK_EX : DLM_LOCK_PR; |
e63aecb6 | 2601 | struct ocfs2_lock_res *lockres = &OCFS2_I(inode)->ip_inode_lockres; |
c271c5c2 | 2602 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
ccd979bd | 2603 | |
b0697053 MF |
2604 | mlog(0, "inode %llu drop %s META lock\n", |
2605 | (unsigned long long)OCFS2_I(inode)->ip_blkno, | |
ccd979bd MF |
2606 | ex ? "EXMODE" : "PRMODE"); |
2607 | ||
1119d3c0 | 2608 | if (!ocfs2_is_hard_readonly(osb) && |
c271c5c2 | 2609 | !ocfs2_mount_local(osb)) |
1119d3c0 | 2610 | ocfs2_cluster_unlock(osb, lockres, level); |
ccd979bd MF |
2611 | } |
2612 | ||
439a36b8 ER |
2613 | /* |
2614 | * This _tracker variantes are introduced to deal with the recursive cluster | |
2615 | * locking issue. The idea is to keep track of a lock holder on the stack of | |
2616 | * the current process. If there's a lock holder on the stack, we know the | |
2617 | * task context is already protected by cluster locking. Currently, they're | |
2618 | * used in some VFS entry routines. | |
2619 | * | |
2620 | * return < 0 on error, return == 0 if there's no lock holder on the stack | |
2621 | * before this call, return == 1 if this call would be a recursive locking. | |
133b81f2 LC |
2622 | * return == -1 if this lock attempt will cause an upgrade which is forbidden. |
2623 | * | |
2624 | * When taking lock levels into account,we face some different situations. | |
2625 | * | |
2626 | * 1. no lock is held | |
2627 | * In this case, just lock the inode as requested and return 0 | |
2628 | * | |
2629 | * 2. We are holding a lock | |
2630 | * For this situation, things diverges into several cases | |
2631 | * | |
2632 | * wanted holding what to do | |
2633 | * ex ex see 2.1 below | |
2634 | * ex pr see 2.2 below | |
2635 | * pr ex see 2.1 below | |
2636 | * pr pr see 2.1 below | |
2637 | * | |
2638 | * 2.1 lock level that is been held is compatible | |
2639 | * with the wanted level, so no lock action will be tacken. | |
2640 | * | |
2641 | * 2.2 Otherwise, an upgrade is needed, but it is forbidden. | |
2642 | * | |
2643 | * Reason why upgrade within a process is forbidden is that | |
2644 | * lock upgrade may cause dead lock. The following illustrates | |
2645 | * how it happens. | |
2646 | * | |
2647 | * thread on node1 thread on node2 | |
2648 | * ocfs2_inode_lock_tracker(ex=0) | |
2649 | * | |
2650 | * <====== ocfs2_inode_lock_tracker(ex=1) | |
2651 | * | |
2652 | * ocfs2_inode_lock_tracker(ex=1) | |
439a36b8 ER |
2653 | */ |
2654 | int ocfs2_inode_lock_tracker(struct inode *inode, | |
2655 | struct buffer_head **ret_bh, | |
2656 | int ex, | |
2657 | struct ocfs2_lock_holder *oh) | |
2658 | { | |
133b81f2 | 2659 | int status = 0; |
439a36b8 | 2660 | struct ocfs2_lock_res *lockres; |
133b81f2 LC |
2661 | struct ocfs2_lock_holder *tmp_oh; |
2662 | struct pid *pid = task_pid(current); | |
2663 | ||
439a36b8 ER |
2664 | |
2665 | lockres = &OCFS2_I(inode)->ip_inode_lockres; | |
133b81f2 | 2666 | tmp_oh = ocfs2_pid_holder(lockres, pid); |
439a36b8 | 2667 | |
133b81f2 LC |
2668 | if (!tmp_oh) { |
2669 | /* | |
2670 | * This corresponds to the case 1. | |
2671 | * We haven't got any lock before. | |
2672 | */ | |
2673 | status = ocfs2_inode_lock_full(inode, ret_bh, ex, 0); | |
439a36b8 ER |
2674 | if (status < 0) { |
2675 | if (status != -ENOENT) | |
2676 | mlog_errno(status); | |
2677 | return status; | |
2678 | } | |
133b81f2 LC |
2679 | |
2680 | oh->oh_ex = ex; | |
439a36b8 | 2681 | ocfs2_add_holder(lockres, oh); |
133b81f2 LC |
2682 | return 0; |
2683 | } | |
439a36b8 | 2684 | |
133b81f2 LC |
2685 | if (unlikely(ex && !tmp_oh->oh_ex)) { |
2686 | /* | |
2687 | * case 2.2 upgrade may cause dead lock, forbid it. | |
2688 | */ | |
2689 | mlog(ML_ERROR, "Recursive locking is not permitted to " | |
2690 | "upgrade to EX level from PR level.\n"); | |
2691 | dump_stack(); | |
2692 | return -EINVAL; | |
2693 | } | |
2694 | ||
2695 | /* | |
2696 | * case 2.1 OCFS2_META_LOCK_GETBH flag make ocfs2_inode_lock_full. | |
2697 | * ignore the lock level and just update it. | |
2698 | */ | |
2699 | if (ret_bh) { | |
2700 | status = ocfs2_inode_lock_full(inode, ret_bh, ex, | |
2701 | OCFS2_META_LOCK_GETBH); | |
2702 | if (status < 0) { | |
2703 | if (status != -ENOENT) | |
2704 | mlog_errno(status); | |
2705 | return status; | |
2706 | } | |
2707 | } | |
2708 | return tmp_oh ? 1 : 0; | |
439a36b8 ER |
2709 | } |
2710 | ||
2711 | void ocfs2_inode_unlock_tracker(struct inode *inode, | |
2712 | int ex, | |
2713 | struct ocfs2_lock_holder *oh, | |
2714 | int had_lock) | |
2715 | { | |
2716 | struct ocfs2_lock_res *lockres; | |
2717 | ||
2718 | lockres = &OCFS2_I(inode)->ip_inode_lockres; | |
8818efaa | 2719 | /* had_lock means that the currect process already takes the cluster |
133b81f2 LC |
2720 | * lock previously. |
2721 | * If had_lock is 1, we have nothing to do here. | |
2722 | * If had_lock is 0, we will release the lock. | |
8818efaa | 2723 | */ |
439a36b8 | 2724 | if (!had_lock) { |
133b81f2 | 2725 | ocfs2_inode_unlock(inode, oh->oh_ex); |
439a36b8 | 2726 | ocfs2_remove_holder(lockres, oh); |
439a36b8 ER |
2727 | } |
2728 | } | |
2729 | ||
df152c24 | 2730 | int ocfs2_orphan_scan_lock(struct ocfs2_super *osb, u32 *seqno) |
83273932 SE |
2731 | { |
2732 | struct ocfs2_lock_res *lockres; | |
2733 | struct ocfs2_orphan_scan_lvb *lvb; | |
83273932 SE |
2734 | int status = 0; |
2735 | ||
df152c24 SM |
2736 | if (ocfs2_is_hard_readonly(osb)) |
2737 | return -EROFS; | |
2738 | ||
2739 | if (ocfs2_mount_local(osb)) | |
2740 | return 0; | |
2741 | ||
83273932 | 2742 | lockres = &osb->osb_orphan_scan.os_lockres; |
df152c24 | 2743 | status = ocfs2_cluster_lock(osb, lockres, DLM_LOCK_EX, 0, 0); |
83273932 SE |
2744 | if (status < 0) |
2745 | return status; | |
2746 | ||
2747 | lvb = ocfs2_dlm_lvb(&lockres->l_lksb); | |
1c520dfb JB |
2748 | if (ocfs2_dlm_lvb_valid(&lockres->l_lksb) && |
2749 | lvb->lvb_version == OCFS2_ORPHAN_LVB_VERSION) | |
83273932 | 2750 | *seqno = be32_to_cpu(lvb->lvb_os_seqno); |
3211949f SM |
2751 | else |
2752 | *seqno = osb->osb_orphan_scan.os_seqno + 1; | |
2753 | ||
83273932 SE |
2754 | return status; |
2755 | } | |
2756 | ||
df152c24 | 2757 | void ocfs2_orphan_scan_unlock(struct ocfs2_super *osb, u32 seqno) |
83273932 SE |
2758 | { |
2759 | struct ocfs2_lock_res *lockres; | |
2760 | struct ocfs2_orphan_scan_lvb *lvb; | |
83273932 | 2761 | |
df152c24 SM |
2762 | if (!ocfs2_is_hard_readonly(osb) && !ocfs2_mount_local(osb)) { |
2763 | lockres = &osb->osb_orphan_scan.os_lockres; | |
2764 | lvb = ocfs2_dlm_lvb(&lockres->l_lksb); | |
2765 | lvb->lvb_version = OCFS2_ORPHAN_LVB_VERSION; | |
2766 | lvb->lvb_os_seqno = cpu_to_be32(seqno); | |
2767 | ocfs2_cluster_unlock(osb, lockres, DLM_LOCK_EX); | |
2768 | } | |
83273932 SE |
2769 | } |
2770 | ||
ccd979bd MF |
2771 | int ocfs2_super_lock(struct ocfs2_super *osb, |
2772 | int ex) | |
2773 | { | |
c271c5c2 | 2774 | int status = 0; |
bd3e7610 | 2775 | int level = ex ? DLM_LOCK_EX : DLM_LOCK_PR; |
ccd979bd | 2776 | struct ocfs2_lock_res *lockres = &osb->osb_super_lockres; |
ccd979bd | 2777 | |
ccd979bd MF |
2778 | if (ocfs2_is_hard_readonly(osb)) |
2779 | return -EROFS; | |
2780 | ||
c271c5c2 SM |
2781 | if (ocfs2_mount_local(osb)) |
2782 | goto bail; | |
2783 | ||
ccd979bd MF |
2784 | status = ocfs2_cluster_lock(osb, lockres, level, 0, 0); |
2785 | if (status < 0) { | |
2786 | mlog_errno(status); | |
2787 | goto bail; | |
2788 | } | |
2789 | ||
2790 | /* The super block lock path is really in the best position to | |
2791 | * know when resources covered by the lock need to be | |
2792 | * refreshed, so we do it here. Of course, making sense of | |
2793 | * everything is up to the caller :) */ | |
2794 | status = ocfs2_should_refresh_lock_res(lockres); | |
ccd979bd | 2795 | if (status) { |
8e8a4603 | 2796 | status = ocfs2_refresh_slot_info(osb); |
ccd979bd MF |
2797 | |
2798 | ocfs2_complete_lock_res_refresh(lockres, status); | |
2799 | ||
3278bb74 JB |
2800 | if (status < 0) { |
2801 | ocfs2_cluster_unlock(osb, lockres, level); | |
ccd979bd | 2802 | mlog_errno(status); |
3278bb74 | 2803 | } |
8ddb7b00 | 2804 | ocfs2_track_lock_refresh(lockres); |
ccd979bd MF |
2805 | } |
2806 | bail: | |
ccd979bd MF |
2807 | return status; |
2808 | } | |
2809 | ||
2810 | void ocfs2_super_unlock(struct ocfs2_super *osb, | |
2811 | int ex) | |
2812 | { | |
bd3e7610 | 2813 | int level = ex ? DLM_LOCK_EX : DLM_LOCK_PR; |
ccd979bd MF |
2814 | struct ocfs2_lock_res *lockres = &osb->osb_super_lockres; |
2815 | ||
c271c5c2 SM |
2816 | if (!ocfs2_mount_local(osb)) |
2817 | ocfs2_cluster_unlock(osb, lockres, level); | |
ccd979bd MF |
2818 | } |
2819 | ||
2820 | int ocfs2_rename_lock(struct ocfs2_super *osb) | |
2821 | { | |
2822 | int status; | |
2823 | struct ocfs2_lock_res *lockres = &osb->osb_rename_lockres; | |
2824 | ||
2825 | if (ocfs2_is_hard_readonly(osb)) | |
2826 | return -EROFS; | |
2827 | ||
c271c5c2 SM |
2828 | if (ocfs2_mount_local(osb)) |
2829 | return 0; | |
2830 | ||
bd3e7610 | 2831 | status = ocfs2_cluster_lock(osb, lockres, DLM_LOCK_EX, 0, 0); |
ccd979bd MF |
2832 | if (status < 0) |
2833 | mlog_errno(status); | |
2834 | ||
2835 | return status; | |
2836 | } | |
2837 | ||
2838 | void ocfs2_rename_unlock(struct ocfs2_super *osb) | |
2839 | { | |
2840 | struct ocfs2_lock_res *lockres = &osb->osb_rename_lockres; | |
2841 | ||
c271c5c2 | 2842 | if (!ocfs2_mount_local(osb)) |
bd3e7610 | 2843 | ocfs2_cluster_unlock(osb, lockres, DLM_LOCK_EX); |
ccd979bd MF |
2844 | } |
2845 | ||
6ca497a8 | 2846 | int ocfs2_nfs_sync_lock(struct ocfs2_super *osb, int ex) |
2847 | { | |
2848 | int status; | |
2849 | struct ocfs2_lock_res *lockres = &osb->osb_nfs_sync_lockres; | |
2850 | ||
2851 | if (ocfs2_is_hard_readonly(osb)) | |
2852 | return -EROFS; | |
2853 | ||
2854 | if (ocfs2_mount_local(osb)) | |
2855 | return 0; | |
2856 | ||
2857 | status = ocfs2_cluster_lock(osb, lockres, ex ? LKM_EXMODE : LKM_PRMODE, | |
2858 | 0, 0); | |
2859 | if (status < 0) | |
2860 | mlog(ML_ERROR, "lock on nfs sync lock failed %d\n", status); | |
2861 | ||
2862 | return status; | |
2863 | } | |
2864 | ||
2865 | void ocfs2_nfs_sync_unlock(struct ocfs2_super *osb, int ex) | |
2866 | { | |
2867 | struct ocfs2_lock_res *lockres = &osb->osb_nfs_sync_lockres; | |
2868 | ||
2869 | if (!ocfs2_mount_local(osb)) | |
2870 | ocfs2_cluster_unlock(osb, lockres, | |
2871 | ex ? LKM_EXMODE : LKM_PRMODE); | |
2872 | } | |
2873 | ||
4882abeb GH |
2874 | int ocfs2_trim_fs_lock(struct ocfs2_super *osb, |
2875 | struct ocfs2_trim_fs_info *info, int trylock) | |
2876 | { | |
2877 | int status; | |
2878 | struct ocfs2_trim_fs_lvb *lvb; | |
2879 | struct ocfs2_lock_res *lockres = &osb->osb_trim_fs_lockres; | |
2880 | ||
2881 | if (info) | |
2882 | info->tf_valid = 0; | |
2883 | ||
2884 | if (ocfs2_is_hard_readonly(osb)) | |
2885 | return -EROFS; | |
2886 | ||
2887 | if (ocfs2_mount_local(osb)) | |
2888 | return 0; | |
2889 | ||
2890 | status = ocfs2_cluster_lock(osb, lockres, DLM_LOCK_EX, | |
2891 | trylock ? DLM_LKF_NOQUEUE : 0, 0); | |
2892 | if (status < 0) { | |
2893 | if (status != -EAGAIN) | |
2894 | mlog_errno(status); | |
2895 | return status; | |
2896 | } | |
2897 | ||
2898 | if (info) { | |
2899 | lvb = ocfs2_dlm_lvb(&lockres->l_lksb); | |
2900 | if (ocfs2_dlm_lvb_valid(&lockres->l_lksb) && | |
2901 | lvb->lvb_version == OCFS2_TRIMFS_LVB_VERSION) { | |
2902 | info->tf_valid = 1; | |
2903 | info->tf_success = lvb->lvb_success; | |
2904 | info->tf_nodenum = be32_to_cpu(lvb->lvb_nodenum); | |
2905 | info->tf_start = be64_to_cpu(lvb->lvb_start); | |
2906 | info->tf_len = be64_to_cpu(lvb->lvb_len); | |
2907 | info->tf_minlen = be64_to_cpu(lvb->lvb_minlen); | |
2908 | info->tf_trimlen = be64_to_cpu(lvb->lvb_trimlen); | |
2909 | } | |
2910 | } | |
2911 | ||
2912 | return status; | |
2913 | } | |
2914 | ||
2915 | void ocfs2_trim_fs_unlock(struct ocfs2_super *osb, | |
2916 | struct ocfs2_trim_fs_info *info) | |
2917 | { | |
2918 | struct ocfs2_trim_fs_lvb *lvb; | |
2919 | struct ocfs2_lock_res *lockres = &osb->osb_trim_fs_lockres; | |
2920 | ||
2921 | if (ocfs2_mount_local(osb)) | |
2922 | return; | |
2923 | ||
2924 | if (info) { | |
2925 | lvb = ocfs2_dlm_lvb(&lockres->l_lksb); | |
2926 | lvb->lvb_version = OCFS2_TRIMFS_LVB_VERSION; | |
2927 | lvb->lvb_success = info->tf_success; | |
2928 | lvb->lvb_nodenum = cpu_to_be32(info->tf_nodenum); | |
2929 | lvb->lvb_start = cpu_to_be64(info->tf_start); | |
2930 | lvb->lvb_len = cpu_to_be64(info->tf_len); | |
2931 | lvb->lvb_minlen = cpu_to_be64(info->tf_minlen); | |
2932 | lvb->lvb_trimlen = cpu_to_be64(info->tf_trimlen); | |
2933 | } | |
2934 | ||
2935 | ocfs2_cluster_unlock(osb, lockres, DLM_LOCK_EX); | |
2936 | } | |
2937 | ||
d680efe9 MF |
2938 | int ocfs2_dentry_lock(struct dentry *dentry, int ex) |
2939 | { | |
2940 | int ret; | |
bd3e7610 | 2941 | int level = ex ? DLM_LOCK_EX : DLM_LOCK_PR; |
d680efe9 MF |
2942 | struct ocfs2_dentry_lock *dl = dentry->d_fsdata; |
2943 | struct ocfs2_super *osb = OCFS2_SB(dentry->d_sb); | |
2944 | ||
2945 | BUG_ON(!dl); | |
2946 | ||
03efed8a TY |
2947 | if (ocfs2_is_hard_readonly(osb)) { |
2948 | if (ex) | |
2949 | return -EROFS; | |
2950 | return 0; | |
2951 | } | |
d680efe9 | 2952 | |
c271c5c2 SM |
2953 | if (ocfs2_mount_local(osb)) |
2954 | return 0; | |
2955 | ||
d680efe9 MF |
2956 | ret = ocfs2_cluster_lock(osb, &dl->dl_lockres, level, 0, 0); |
2957 | if (ret < 0) | |
2958 | mlog_errno(ret); | |
2959 | ||
2960 | return ret; | |
2961 | } | |
2962 | ||
2963 | void ocfs2_dentry_unlock(struct dentry *dentry, int ex) | |
2964 | { | |
bd3e7610 | 2965 | int level = ex ? DLM_LOCK_EX : DLM_LOCK_PR; |
d680efe9 MF |
2966 | struct ocfs2_dentry_lock *dl = dentry->d_fsdata; |
2967 | struct ocfs2_super *osb = OCFS2_SB(dentry->d_sb); | |
2968 | ||
03efed8a | 2969 | if (!ocfs2_is_hard_readonly(osb) && !ocfs2_mount_local(osb)) |
c271c5c2 | 2970 | ocfs2_cluster_unlock(osb, &dl->dl_lockres, level); |
d680efe9 MF |
2971 | } |
2972 | ||
ccd979bd MF |
2973 | /* Reference counting of the dlm debug structure. We want this because |
2974 | * open references on the debug inodes can live on after a mount, so | |
2975 | * we can't rely on the ocfs2_super to always exist. */ | |
2976 | static void ocfs2_dlm_debug_free(struct kref *kref) | |
2977 | { | |
2978 | struct ocfs2_dlm_debug *dlm_debug; | |
2979 | ||
2980 | dlm_debug = container_of(kref, struct ocfs2_dlm_debug, d_refcnt); | |
2981 | ||
2982 | kfree(dlm_debug); | |
2983 | } | |
2984 | ||
2985 | void ocfs2_put_dlm_debug(struct ocfs2_dlm_debug *dlm_debug) | |
2986 | { | |
2987 | if (dlm_debug) | |
2988 | kref_put(&dlm_debug->d_refcnt, ocfs2_dlm_debug_free); | |
2989 | } | |
2990 | ||
2991 | static void ocfs2_get_dlm_debug(struct ocfs2_dlm_debug *debug) | |
2992 | { | |
2993 | kref_get(&debug->d_refcnt); | |
2994 | } | |
2995 | ||
2996 | struct ocfs2_dlm_debug *ocfs2_new_dlm_debug(void) | |
2997 | { | |
2998 | struct ocfs2_dlm_debug *dlm_debug; | |
2999 | ||
3000 | dlm_debug = kmalloc(sizeof(struct ocfs2_dlm_debug), GFP_KERNEL); | |
3001 | if (!dlm_debug) { | |
3002 | mlog_errno(-ENOMEM); | |
3003 | goto out; | |
3004 | } | |
3005 | ||
3006 | kref_init(&dlm_debug->d_refcnt); | |
3007 | INIT_LIST_HEAD(&dlm_debug->d_lockres_tracking); | |
3008 | dlm_debug->d_locking_state = NULL; | |
3009 | out: | |
3010 | return dlm_debug; | |
3011 | } | |
3012 | ||
3013 | /* Access to this is arbitrated for us via seq_file->sem. */ | |
3014 | struct ocfs2_dlm_seq_priv { | |
3015 | struct ocfs2_dlm_debug *p_dlm_debug; | |
3016 | struct ocfs2_lock_res p_iter_res; | |
3017 | struct ocfs2_lock_res p_tmp_res; | |
3018 | }; | |
3019 | ||
3020 | static struct ocfs2_lock_res *ocfs2_dlm_next_res(struct ocfs2_lock_res *start, | |
3021 | struct ocfs2_dlm_seq_priv *priv) | |
3022 | { | |
3023 | struct ocfs2_lock_res *iter, *ret = NULL; | |
3024 | struct ocfs2_dlm_debug *dlm_debug = priv->p_dlm_debug; | |
3025 | ||
3026 | assert_spin_locked(&ocfs2_dlm_tracking_lock); | |
3027 | ||
3028 | list_for_each_entry(iter, &start->l_debug_list, l_debug_list) { | |
3029 | /* discover the head of the list */ | |
3030 | if (&iter->l_debug_list == &dlm_debug->d_lockres_tracking) { | |
3031 | mlog(0, "End of list found, %p\n", ret); | |
3032 | break; | |
3033 | } | |
3034 | ||
3035 | /* We track our "dummy" iteration lockres' by a NULL | |
3036 | * l_ops field. */ | |
3037 | if (iter->l_ops != NULL) { | |
3038 | ret = iter; | |
3039 | break; | |
3040 | } | |
3041 | } | |
3042 | ||
3043 | return ret; | |
3044 | } | |
3045 | ||
3046 | static void *ocfs2_dlm_seq_start(struct seq_file *m, loff_t *pos) | |
3047 | { | |
3048 | struct ocfs2_dlm_seq_priv *priv = m->private; | |
3049 | struct ocfs2_lock_res *iter; | |
3050 | ||
3051 | spin_lock(&ocfs2_dlm_tracking_lock); | |
3052 | iter = ocfs2_dlm_next_res(&priv->p_iter_res, priv); | |
3053 | if (iter) { | |
3054 | /* Since lockres' have the lifetime of their container | |
3055 | * (which can be inodes, ocfs2_supers, etc) we want to | |
3056 | * copy this out to a temporary lockres while still | |
3057 | * under the spinlock. Obviously after this we can't | |
3058 | * trust any pointers on the copy returned, but that's | |
3059 | * ok as the information we want isn't typically held | |
3060 | * in them. */ | |
3061 | priv->p_tmp_res = *iter; | |
3062 | iter = &priv->p_tmp_res; | |
3063 | } | |
3064 | spin_unlock(&ocfs2_dlm_tracking_lock); | |
3065 | ||
3066 | return iter; | |
3067 | } | |
3068 | ||
3069 | static void ocfs2_dlm_seq_stop(struct seq_file *m, void *v) | |
3070 | { | |
3071 | } | |
3072 | ||
3073 | static void *ocfs2_dlm_seq_next(struct seq_file *m, void *v, loff_t *pos) | |
3074 | { | |
3075 | struct ocfs2_dlm_seq_priv *priv = m->private; | |
3076 | struct ocfs2_lock_res *iter = v; | |
3077 | struct ocfs2_lock_res *dummy = &priv->p_iter_res; | |
3078 | ||
3079 | spin_lock(&ocfs2_dlm_tracking_lock); | |
3080 | iter = ocfs2_dlm_next_res(iter, priv); | |
3081 | list_del_init(&dummy->l_debug_list); | |
3082 | if (iter) { | |
3083 | list_add(&dummy->l_debug_list, &iter->l_debug_list); | |
3084 | priv->p_tmp_res = *iter; | |
3085 | iter = &priv->p_tmp_res; | |
3086 | } | |
3087 | spin_unlock(&ocfs2_dlm_tracking_lock); | |
3088 | ||
3089 | return iter; | |
3090 | } | |
3091 | ||
5bc970e8 SM |
3092 | /* |
3093 | * Version is used by debugfs.ocfs2 to determine the format being used | |
3094 | * | |
3095 | * New in version 2 | |
3096 | * - Lock stats printed | |
3097 | * New in version 3 | |
3098 | * - Max time in lock stats is in usecs (instead of nsecs) | |
3099 | */ | |
3100 | #define OCFS2_DLM_DEBUG_STR_VERSION 3 | |
ccd979bd MF |
3101 | static int ocfs2_dlm_seq_show(struct seq_file *m, void *v) |
3102 | { | |
3103 | int i; | |
3104 | char *lvb; | |
3105 | struct ocfs2_lock_res *lockres = v; | |
3106 | ||
3107 | if (!lockres) | |
3108 | return -EINVAL; | |
3109 | ||
d680efe9 MF |
3110 | seq_printf(m, "0x%x\t", OCFS2_DLM_DEBUG_STR_VERSION); |
3111 | ||
3112 | if (lockres->l_type == OCFS2_LOCK_TYPE_DENTRY) | |
3113 | seq_printf(m, "%.*s%08x\t", OCFS2_DENTRY_LOCK_INO_START - 1, | |
3114 | lockres->l_name, | |
3115 | (unsigned int)ocfs2_get_dentry_lock_ino(lockres)); | |
3116 | else | |
3117 | seq_printf(m, "%.*s\t", OCFS2_LOCK_ID_MAX_LEN, lockres->l_name); | |
3118 | ||
3119 | seq_printf(m, "%d\t" | |
ccd979bd MF |
3120 | "0x%lx\t" |
3121 | "0x%x\t" | |
3122 | "0x%x\t" | |
3123 | "%u\t" | |
3124 | "%u\t" | |
3125 | "%d\t" | |
3126 | "%d\t", | |
ccd979bd MF |
3127 | lockres->l_level, |
3128 | lockres->l_flags, | |
3129 | lockres->l_action, | |
3130 | lockres->l_unlock_action, | |
3131 | lockres->l_ro_holders, | |
3132 | lockres->l_ex_holders, | |
3133 | lockres->l_requested, | |
3134 | lockres->l_blocking); | |
3135 | ||
3136 | /* Dump the raw LVB */ | |
8f2c9c1b | 3137 | lvb = ocfs2_dlm_lvb(&lockres->l_lksb); |
ccd979bd MF |
3138 | for(i = 0; i < DLM_LVB_LEN; i++) |
3139 | seq_printf(m, "0x%x\t", lvb[i]); | |
3140 | ||
8ddb7b00 | 3141 | #ifdef CONFIG_OCFS2_FS_STATS |
5bc970e8 SM |
3142 | # define lock_num_prmode(_l) ((_l)->l_lock_prmode.ls_gets) |
3143 | # define lock_num_exmode(_l) ((_l)->l_lock_exmode.ls_gets) | |
3144 | # define lock_num_prmode_failed(_l) ((_l)->l_lock_prmode.ls_fail) | |
3145 | # define lock_num_exmode_failed(_l) ((_l)->l_lock_exmode.ls_fail) | |
3146 | # define lock_total_prmode(_l) ((_l)->l_lock_prmode.ls_total) | |
3147 | # define lock_total_exmode(_l) ((_l)->l_lock_exmode.ls_total) | |
3148 | # define lock_max_prmode(_l) ((_l)->l_lock_prmode.ls_max) | |
3149 | # define lock_max_exmode(_l) ((_l)->l_lock_exmode.ls_max) | |
3150 | # define lock_refresh(_l) ((_l)->l_lock_refresh) | |
8ddb7b00 | 3151 | #else |
5bc970e8 SM |
3152 | # define lock_num_prmode(_l) (0) |
3153 | # define lock_num_exmode(_l) (0) | |
8ddb7b00 SM |
3154 | # define lock_num_prmode_failed(_l) (0) |
3155 | # define lock_num_exmode_failed(_l) (0) | |
dd25e55e RD |
3156 | # define lock_total_prmode(_l) (0ULL) |
3157 | # define lock_total_exmode(_l) (0ULL) | |
8ddb7b00 SM |
3158 | # define lock_max_prmode(_l) (0) |
3159 | # define lock_max_exmode(_l) (0) | |
3160 | # define lock_refresh(_l) (0) | |
3161 | #endif | |
3162 | /* The following seq_print was added in version 2 of this output */ | |
5bc970e8 SM |
3163 | seq_printf(m, "%u\t" |
3164 | "%u\t" | |
8ddb7b00 SM |
3165 | "%u\t" |
3166 | "%u\t" | |
3167 | "%llu\t" | |
3168 | "%llu\t" | |
3169 | "%u\t" | |
3170 | "%u\t" | |
3171 | "%u\t", | |
3172 | lock_num_prmode(lockres), | |
3173 | lock_num_exmode(lockres), | |
3174 | lock_num_prmode_failed(lockres), | |
3175 | lock_num_exmode_failed(lockres), | |
3176 | lock_total_prmode(lockres), | |
3177 | lock_total_exmode(lockres), | |
3178 | lock_max_prmode(lockres), | |
3179 | lock_max_exmode(lockres), | |
3180 | lock_refresh(lockres)); | |
3181 | ||
ccd979bd MF |
3182 | /* End the line */ |
3183 | seq_printf(m, "\n"); | |
3184 | return 0; | |
3185 | } | |
3186 | ||
90d99779 | 3187 | static const struct seq_operations ocfs2_dlm_seq_ops = { |
ccd979bd MF |
3188 | .start = ocfs2_dlm_seq_start, |
3189 | .stop = ocfs2_dlm_seq_stop, | |
3190 | .next = ocfs2_dlm_seq_next, | |
3191 | .show = ocfs2_dlm_seq_show, | |
3192 | }; | |
3193 | ||
3194 | static int ocfs2_dlm_debug_release(struct inode *inode, struct file *file) | |
3195 | { | |
33fa1d90 | 3196 | struct seq_file *seq = file->private_data; |
ccd979bd MF |
3197 | struct ocfs2_dlm_seq_priv *priv = seq->private; |
3198 | struct ocfs2_lock_res *res = &priv->p_iter_res; | |
3199 | ||
3200 | ocfs2_remove_lockres_tracking(res); | |
3201 | ocfs2_put_dlm_debug(priv->p_dlm_debug); | |
3202 | return seq_release_private(inode, file); | |
3203 | } | |
3204 | ||
3205 | static int ocfs2_dlm_debug_open(struct inode *inode, struct file *file) | |
3206 | { | |
ccd979bd | 3207 | struct ocfs2_dlm_seq_priv *priv; |
ccd979bd MF |
3208 | struct ocfs2_super *osb; |
3209 | ||
1848cb55 | 3210 | priv = __seq_open_private(file, &ocfs2_dlm_seq_ops, sizeof(*priv)); |
ccd979bd | 3211 | if (!priv) { |
1848cb55 RJ |
3212 | mlog_errno(-ENOMEM); |
3213 | return -ENOMEM; | |
ccd979bd | 3214 | } |
1848cb55 | 3215 | |
8e18e294 | 3216 | osb = inode->i_private; |
ccd979bd MF |
3217 | ocfs2_get_dlm_debug(osb->osb_dlm_debug); |
3218 | priv->p_dlm_debug = osb->osb_dlm_debug; | |
3219 | INIT_LIST_HEAD(&priv->p_iter_res.l_debug_list); | |
3220 | ||
ccd979bd MF |
3221 | ocfs2_add_lockres_tracking(&priv->p_iter_res, |
3222 | priv->p_dlm_debug); | |
3223 | ||
1848cb55 | 3224 | return 0; |
ccd979bd MF |
3225 | } |
3226 | ||
4b6f5d20 | 3227 | static const struct file_operations ocfs2_dlm_debug_fops = { |
ccd979bd MF |
3228 | .open = ocfs2_dlm_debug_open, |
3229 | .release = ocfs2_dlm_debug_release, | |
3230 | .read = seq_read, | |
3231 | .llseek = seq_lseek, | |
3232 | }; | |
3233 | ||
3234 | static int ocfs2_dlm_init_debug(struct ocfs2_super *osb) | |
3235 | { | |
3236 | int ret = 0; | |
3237 | struct ocfs2_dlm_debug *dlm_debug = osb->osb_dlm_debug; | |
3238 | ||
3239 | dlm_debug->d_locking_state = debugfs_create_file("locking_state", | |
3240 | S_IFREG|S_IRUSR, | |
3241 | osb->osb_debug_root, | |
3242 | osb, | |
3243 | &ocfs2_dlm_debug_fops); | |
8f443e23 | 3244 | if (!dlm_debug->d_locking_state) { |
ccd979bd MF |
3245 | ret = -EINVAL; |
3246 | mlog(ML_ERROR, | |
3247 | "Unable to create locking state debugfs file.\n"); | |
3248 | goto out; | |
3249 | } | |
3250 | ||
3251 | ocfs2_get_dlm_debug(dlm_debug); | |
3252 | out: | |
3253 | return ret; | |
3254 | } | |
3255 | ||
3256 | static void ocfs2_dlm_shutdown_debug(struct ocfs2_super *osb) | |
3257 | { | |
3258 | struct ocfs2_dlm_debug *dlm_debug = osb->osb_dlm_debug; | |
3259 | ||
3260 | if (dlm_debug) { | |
3261 | debugfs_remove(dlm_debug->d_locking_state); | |
3262 | ocfs2_put_dlm_debug(dlm_debug); | |
3263 | } | |
3264 | } | |
3265 | ||
3266 | int ocfs2_dlm_init(struct ocfs2_super *osb) | |
3267 | { | |
c271c5c2 | 3268 | int status = 0; |
4670c46d | 3269 | struct ocfs2_cluster_connection *conn = NULL; |
ccd979bd | 3270 | |
0abd6d18 MF |
3271 | if (ocfs2_mount_local(osb)) { |
3272 | osb->node_num = 0; | |
c271c5c2 | 3273 | goto local; |
0abd6d18 | 3274 | } |
c271c5c2 | 3275 | |
ccd979bd MF |
3276 | status = ocfs2_dlm_init_debug(osb); |
3277 | if (status < 0) { | |
3278 | mlog_errno(status); | |
3279 | goto bail; | |
3280 | } | |
3281 | ||
34d024f8 | 3282 | /* launch downconvert thread */ |
5afc44e2 JQ |
3283 | osb->dc_task = kthread_run(ocfs2_downconvert_thread, osb, "ocfs2dc-%s", |
3284 | osb->uuid_str); | |
34d024f8 MF |
3285 | if (IS_ERR(osb->dc_task)) { |
3286 | status = PTR_ERR(osb->dc_task); | |
3287 | osb->dc_task = NULL; | |
ccd979bd MF |
3288 | mlog_errno(status); |
3289 | goto bail; | |
3290 | } | |
3291 | ||
ccd979bd | 3292 | /* for now, uuid == domain */ |
9c6c877c | 3293 | status = ocfs2_cluster_connect(osb->osb_cluster_stack, |
c74a3bdd GR |
3294 | osb->osb_cluster_name, |
3295 | strlen(osb->osb_cluster_name), | |
9c6c877c | 3296 | osb->uuid_str, |
4670c46d | 3297 | strlen(osb->uuid_str), |
553b5eb9 | 3298 | &lproto, ocfs2_do_node_down, osb, |
4670c46d JB |
3299 | &conn); |
3300 | if (status) { | |
ccd979bd MF |
3301 | mlog_errno(status); |
3302 | goto bail; | |
3303 | } | |
3304 | ||
3e834151 | 3305 | status = ocfs2_cluster_this_node(conn, &osb->node_num); |
0abd6d18 MF |
3306 | if (status < 0) { |
3307 | mlog_errno(status); | |
3308 | mlog(ML_ERROR, | |
3309 | "could not find this host's node number\n"); | |
286eaa95 | 3310 | ocfs2_cluster_disconnect(conn, 0); |
0abd6d18 MF |
3311 | goto bail; |
3312 | } | |
3313 | ||
c271c5c2 | 3314 | local: |
ccd979bd MF |
3315 | ocfs2_super_lock_res_init(&osb->osb_super_lockres, osb); |
3316 | ocfs2_rename_lock_res_init(&osb->osb_rename_lockres, osb); | |
6ca497a8 | 3317 | ocfs2_nfs_sync_lock_res_init(&osb->osb_nfs_sync_lockres, osb); |
83273932 | 3318 | ocfs2_orphan_scan_lock_res_init(&osb->osb_orphan_scan.os_lockres, osb); |
ccd979bd | 3319 | |
4670c46d | 3320 | osb->cconn = conn; |
ccd979bd MF |
3321 | bail: |
3322 | if (status < 0) { | |
3323 | ocfs2_dlm_shutdown_debug(osb); | |
34d024f8 MF |
3324 | if (osb->dc_task) |
3325 | kthread_stop(osb->dc_task); | |
ccd979bd MF |
3326 | } |
3327 | ||
ccd979bd MF |
3328 | return status; |
3329 | } | |
3330 | ||
286eaa95 JB |
3331 | void ocfs2_dlm_shutdown(struct ocfs2_super *osb, |
3332 | int hangup_pending) | |
ccd979bd | 3333 | { |
ccd979bd MF |
3334 | ocfs2_drop_osb_locks(osb); |
3335 | ||
4670c46d JB |
3336 | /* |
3337 | * Now that we have dropped all locks and ocfs2_dismount_volume() | |
3338 | * has disabled recovery, the DLM won't be talking to us. It's | |
3339 | * safe to tear things down before disconnecting the cluster. | |
3340 | */ | |
3341 | ||
34d024f8 MF |
3342 | if (osb->dc_task) { |
3343 | kthread_stop(osb->dc_task); | |
3344 | osb->dc_task = NULL; | |
ccd979bd MF |
3345 | } |
3346 | ||
3347 | ocfs2_lock_res_free(&osb->osb_super_lockres); | |
3348 | ocfs2_lock_res_free(&osb->osb_rename_lockres); | |
6ca497a8 | 3349 | ocfs2_lock_res_free(&osb->osb_nfs_sync_lockres); |
83273932 | 3350 | ocfs2_lock_res_free(&osb->osb_orphan_scan.os_lockres); |
ccd979bd | 3351 | |
286eaa95 | 3352 | ocfs2_cluster_disconnect(osb->cconn, hangup_pending); |
4670c46d | 3353 | osb->cconn = NULL; |
ccd979bd MF |
3354 | |
3355 | ocfs2_dlm_shutdown_debug(osb); | |
ccd979bd MF |
3356 | } |
3357 | ||
ccd979bd | 3358 | static int ocfs2_drop_lock(struct ocfs2_super *osb, |
0d5dc6c2 | 3359 | struct ocfs2_lock_res *lockres) |
ccd979bd | 3360 | { |
7431cd7e | 3361 | int ret; |
ccd979bd | 3362 | unsigned long flags; |
bd3e7610 | 3363 | u32 lkm_flags = 0; |
ccd979bd MF |
3364 | |
3365 | /* We didn't get anywhere near actually using this lockres. */ | |
3366 | if (!(lockres->l_flags & OCFS2_LOCK_INITIALIZED)) | |
3367 | goto out; | |
3368 | ||
b80fc012 | 3369 | if (lockres->l_ops->flags & LOCK_TYPE_USES_LVB) |
bd3e7610 | 3370 | lkm_flags |= DLM_LKF_VALBLK; |
b80fc012 | 3371 | |
ccd979bd MF |
3372 | spin_lock_irqsave(&lockres->l_lock, flags); |
3373 | ||
3374 | mlog_bug_on_msg(!(lockres->l_flags & OCFS2_LOCK_FREEING), | |
3375 | "lockres %s, flags 0x%lx\n", | |
3376 | lockres->l_name, lockres->l_flags); | |
3377 | ||
3378 | while (lockres->l_flags & OCFS2_LOCK_BUSY) { | |
3379 | mlog(0, "waiting on busy lock \"%s\": flags = %lx, action = " | |
3380 | "%u, unlock_action = %u\n", | |
3381 | lockres->l_name, lockres->l_flags, lockres->l_action, | |
3382 | lockres->l_unlock_action); | |
3383 | ||
3384 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
3385 | ||
3386 | /* XXX: Today we just wait on any busy | |
3387 | * locks... Perhaps we need to cancel converts in the | |
3388 | * future? */ | |
3389 | ocfs2_wait_on_busy_lock(lockres); | |
3390 | ||
3391 | spin_lock_irqsave(&lockres->l_lock, flags); | |
3392 | } | |
3393 | ||
0d5dc6c2 MF |
3394 | if (lockres->l_ops->flags & LOCK_TYPE_USES_LVB) { |
3395 | if (lockres->l_flags & OCFS2_LOCK_ATTACHED && | |
bd3e7610 | 3396 | lockres->l_level == DLM_LOCK_EX && |
0d5dc6c2 MF |
3397 | !(lockres->l_flags & OCFS2_LOCK_NEEDS_REFRESH)) |
3398 | lockres->l_ops->set_lvb(lockres); | |
3399 | } | |
ccd979bd MF |
3400 | |
3401 | if (lockres->l_flags & OCFS2_LOCK_BUSY) | |
3402 | mlog(ML_ERROR, "destroying busy lock: \"%s\"\n", | |
3403 | lockres->l_name); | |
3404 | if (lockres->l_flags & OCFS2_LOCK_BLOCKED) | |
3405 | mlog(0, "destroying blocked lock: \"%s\"\n", lockres->l_name); | |
3406 | ||
3407 | if (!(lockres->l_flags & OCFS2_LOCK_ATTACHED)) { | |
3408 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
3409 | goto out; | |
3410 | } | |
3411 | ||
3412 | lockres_clear_flags(lockres, OCFS2_LOCK_ATTACHED); | |
3413 | ||
3414 | /* make sure we never get here while waiting for an ast to | |
3415 | * fire. */ | |
3416 | BUG_ON(lockres->l_action != OCFS2_AST_INVALID); | |
3417 | ||
3418 | /* is this necessary? */ | |
3419 | lockres_or_flags(lockres, OCFS2_LOCK_BUSY); | |
3420 | lockres->l_unlock_action = OCFS2_UNLOCK_DROP_LOCK; | |
3421 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
3422 | ||
3423 | mlog(0, "lock %s\n", lockres->l_name); | |
3424 | ||
a796d286 | 3425 | ret = ocfs2_dlm_unlock(osb->cconn, &lockres->l_lksb, lkm_flags); |
7431cd7e JB |
3426 | if (ret) { |
3427 | ocfs2_log_dlm_error("ocfs2_dlm_unlock", ret, lockres); | |
ccd979bd | 3428 | mlog(ML_ERROR, "lockres flags: %lu\n", lockres->l_flags); |
cf0acdcd | 3429 | ocfs2_dlm_dump_lksb(&lockres->l_lksb); |
ccd979bd MF |
3430 | BUG(); |
3431 | } | |
73ac36ea | 3432 | mlog(0, "lock %s, successful return from ocfs2_dlm_unlock\n", |
ccd979bd MF |
3433 | lockres->l_name); |
3434 | ||
3435 | ocfs2_wait_on_busy_lock(lockres); | |
3436 | out: | |
ccd979bd MF |
3437 | return 0; |
3438 | } | |
3439 | ||
84d86f83 JK |
3440 | static void ocfs2_process_blocked_lock(struct ocfs2_super *osb, |
3441 | struct ocfs2_lock_res *lockres); | |
3442 | ||
ccd979bd MF |
3443 | /* Mark the lockres as being dropped. It will no longer be |
3444 | * queued if blocking, but we still may have to wait on it | |
34d024f8 | 3445 | * being dequeued from the downconvert thread before we can consider |
2bd63216 | 3446 | * it safe to drop. |
ccd979bd MF |
3447 | * |
3448 | * You can *not* attempt to call cluster_lock on this lockres anymore. */ | |
84d86f83 JK |
3449 | void ocfs2_mark_lockres_freeing(struct ocfs2_super *osb, |
3450 | struct ocfs2_lock_res *lockres) | |
ccd979bd MF |
3451 | { |
3452 | int status; | |
3453 | struct ocfs2_mask_waiter mw; | |
84d86f83 | 3454 | unsigned long flags, flags2; |
ccd979bd MF |
3455 | |
3456 | ocfs2_init_mask_waiter(&mw); | |
3457 | ||
3458 | spin_lock_irqsave(&lockres->l_lock, flags); | |
3459 | lockres->l_flags |= OCFS2_LOCK_FREEING; | |
84d86f83 JK |
3460 | if (lockres->l_flags & OCFS2_LOCK_QUEUED && current == osb->dc_task) { |
3461 | /* | |
3462 | * We know the downconvert is queued but not in progress | |
3463 | * because we are the downconvert thread and processing | |
3464 | * different lock. So we can just remove the lock from the | |
3465 | * queue. This is not only an optimization but also a way | |
3466 | * to avoid the following deadlock: | |
3467 | * ocfs2_dentry_post_unlock() | |
3468 | * ocfs2_dentry_lock_put() | |
3469 | * ocfs2_drop_dentry_lock() | |
3470 | * iput() | |
3471 | * ocfs2_evict_inode() | |
3472 | * ocfs2_clear_inode() | |
3473 | * ocfs2_mark_lockres_freeing() | |
3474 | * ... blocks waiting for OCFS2_LOCK_QUEUED | |
3475 | * since we are the downconvert thread which | |
3476 | * should clear the flag. | |
3477 | */ | |
3478 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
3479 | spin_lock_irqsave(&osb->dc_task_lock, flags2); | |
3480 | list_del_init(&lockres->l_blocked_list); | |
3481 | osb->blocked_lock_count--; | |
3482 | spin_unlock_irqrestore(&osb->dc_task_lock, flags2); | |
3483 | /* | |
3484 | * Warn if we recurse into another post_unlock call. Strictly | |
3485 | * speaking it isn't a problem but we need to be careful if | |
3486 | * that happens (stack overflow, deadlocks, ...) so warn if | |
3487 | * ocfs2 grows a path for which this can happen. | |
3488 | */ | |
3489 | WARN_ON_ONCE(lockres->l_ops->post_unlock); | |
3490 | /* Since the lock is freeing we don't do much in the fn below */ | |
3491 | ocfs2_process_blocked_lock(osb, lockres); | |
3492 | return; | |
3493 | } | |
ccd979bd MF |
3494 | while (lockres->l_flags & OCFS2_LOCK_QUEUED) { |
3495 | lockres_add_mask_waiter(lockres, &mw, OCFS2_LOCK_QUEUED, 0); | |
3496 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
3497 | ||
3498 | mlog(0, "Waiting on lockres %s\n", lockres->l_name); | |
3499 | ||
3500 | status = ocfs2_wait_for_mask(&mw); | |
3501 | if (status) | |
3502 | mlog_errno(status); | |
3503 | ||
3504 | spin_lock_irqsave(&lockres->l_lock, flags); | |
3505 | } | |
3506 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
3507 | } | |
3508 | ||
d680efe9 MF |
3509 | void ocfs2_simple_drop_lockres(struct ocfs2_super *osb, |
3510 | struct ocfs2_lock_res *lockres) | |
ccd979bd | 3511 | { |
d680efe9 | 3512 | int ret; |
ccd979bd | 3513 | |
84d86f83 | 3514 | ocfs2_mark_lockres_freeing(osb, lockres); |
0d5dc6c2 | 3515 | ret = ocfs2_drop_lock(osb, lockres); |
d680efe9 MF |
3516 | if (ret) |
3517 | mlog_errno(ret); | |
3518 | } | |
ccd979bd | 3519 | |
d680efe9 MF |
3520 | static void ocfs2_drop_osb_locks(struct ocfs2_super *osb) |
3521 | { | |
3522 | ocfs2_simple_drop_lockres(osb, &osb->osb_super_lockres); | |
3523 | ocfs2_simple_drop_lockres(osb, &osb->osb_rename_lockres); | |
6ca497a8 | 3524 | ocfs2_simple_drop_lockres(osb, &osb->osb_nfs_sync_lockres); |
83273932 | 3525 | ocfs2_simple_drop_lockres(osb, &osb->osb_orphan_scan.os_lockres); |
ccd979bd MF |
3526 | } |
3527 | ||
ccd979bd MF |
3528 | int ocfs2_drop_inode_locks(struct inode *inode) |
3529 | { | |
3530 | int status, err; | |
ccd979bd | 3531 | |
ccd979bd MF |
3532 | /* No need to call ocfs2_mark_lockres_freeing here - |
3533 | * ocfs2_clear_inode has done it for us. */ | |
3534 | ||
3535 | err = ocfs2_drop_lock(OCFS2_SB(inode->i_sb), | |
50008630 | 3536 | &OCFS2_I(inode)->ip_open_lockres); |
ccd979bd MF |
3537 | if (err < 0) |
3538 | mlog_errno(err); | |
3539 | ||
3540 | status = err; | |
3541 | ||
3542 | err = ocfs2_drop_lock(OCFS2_SB(inode->i_sb), | |
e63aecb6 | 3543 | &OCFS2_I(inode)->ip_inode_lockres); |
ccd979bd MF |
3544 | if (err < 0) |
3545 | mlog_errno(err); | |
3546 | if (err < 0 && !status) | |
3547 | status = err; | |
3548 | ||
3549 | err = ocfs2_drop_lock(OCFS2_SB(inode->i_sb), | |
0d5dc6c2 | 3550 | &OCFS2_I(inode)->ip_rw_lockres); |
ccd979bd MF |
3551 | if (err < 0) |
3552 | mlog_errno(err); | |
3553 | if (err < 0 && !status) | |
3554 | status = err; | |
3555 | ||
ccd979bd MF |
3556 | return status; |
3557 | } | |
3558 | ||
de551246 JB |
3559 | static unsigned int ocfs2_prepare_downconvert(struct ocfs2_lock_res *lockres, |
3560 | int new_level) | |
ccd979bd MF |
3561 | { |
3562 | assert_spin_locked(&lockres->l_lock); | |
3563 | ||
bd3e7610 | 3564 | BUG_ON(lockres->l_blocking <= DLM_LOCK_NL); |
ccd979bd MF |
3565 | |
3566 | if (lockres->l_level <= new_level) { | |
9b915181 SM |
3567 | mlog(ML_ERROR, "lockres %s, lvl %d <= %d, blcklst %d, mask %d, " |
3568 | "type %d, flags 0x%lx, hold %d %d, act %d %d, req %d, " | |
3569 | "block %d, pgen %d\n", lockres->l_name, lockres->l_level, | |
3570 | new_level, list_empty(&lockres->l_blocked_list), | |
3571 | list_empty(&lockres->l_mask_waiters), lockres->l_type, | |
3572 | lockres->l_flags, lockres->l_ro_holders, | |
3573 | lockres->l_ex_holders, lockres->l_action, | |
3574 | lockres->l_unlock_action, lockres->l_requested, | |
3575 | lockres->l_blocking, lockres->l_pending_gen); | |
ccd979bd MF |
3576 | BUG(); |
3577 | } | |
3578 | ||
9b915181 SM |
3579 | mlog(ML_BASTS, "lockres %s, level %d => %d, blocking %d\n", |
3580 | lockres->l_name, lockres->l_level, new_level, lockres->l_blocking); | |
ccd979bd MF |
3581 | |
3582 | lockres->l_action = OCFS2_AST_DOWNCONVERT; | |
3583 | lockres->l_requested = new_level; | |
3584 | lockres_or_flags(lockres, OCFS2_LOCK_BUSY); | |
de551246 | 3585 | return lockres_set_pending(lockres); |
ccd979bd MF |
3586 | } |
3587 | ||
3588 | static int ocfs2_downconvert_lock(struct ocfs2_super *osb, | |
3589 | struct ocfs2_lock_res *lockres, | |
3590 | int new_level, | |
de551246 JB |
3591 | int lvb, |
3592 | unsigned int generation) | |
ccd979bd | 3593 | { |
bd3e7610 JB |
3594 | int ret; |
3595 | u32 dlm_flags = DLM_LKF_CONVERT; | |
ccd979bd | 3596 | |
9b915181 SM |
3597 | mlog(ML_BASTS, "lockres %s, level %d => %d\n", lockres->l_name, |
3598 | lockres->l_level, new_level); | |
3599 | ||
e7ee2c08 ER |
3600 | /* |
3601 | * On DLM_LKF_VALBLK, fsdlm behaves differently with o2cb. It always | |
3602 | * expects DLM_LKF_VALBLK being set if the LKB has LVB, so that | |
3603 | * we can recover correctly from node failure. Otherwise, we may get | |
793057e1 | 3604 | * invalid LVB in LKB, but without DLM_SBF_VALNOTVALID being set. |
e7ee2c08 ER |
3605 | */ |
3606 | if (!ocfs2_is_o2cb_active() && | |
3607 | lockres->l_ops->flags & LOCK_TYPE_USES_LVB) | |
3608 | lvb = 1; | |
3609 | ||
ccd979bd | 3610 | if (lvb) |
bd3e7610 | 3611 | dlm_flags |= DLM_LKF_VALBLK; |
ccd979bd | 3612 | |
4670c46d | 3613 | ret = ocfs2_dlm_lock(osb->cconn, |
7431cd7e JB |
3614 | new_level, |
3615 | &lockres->l_lksb, | |
3616 | dlm_flags, | |
3617 | lockres->l_name, | |
a796d286 | 3618 | OCFS2_LOCK_ID_MAX_LEN - 1); |
de551246 | 3619 | lockres_clear_pending(lockres, generation, osb); |
7431cd7e JB |
3620 | if (ret) { |
3621 | ocfs2_log_dlm_error("ocfs2_dlm_lock", ret, lockres); | |
ccd979bd MF |
3622 | ocfs2_recover_from_dlm_error(lockres, 1); |
3623 | goto bail; | |
3624 | } | |
3625 | ||
3626 | ret = 0; | |
3627 | bail: | |
ccd979bd MF |
3628 | return ret; |
3629 | } | |
3630 | ||
24ef1815 | 3631 | /* returns 1 when the caller should unlock and call ocfs2_dlm_unlock */ |
ccd979bd MF |
3632 | static int ocfs2_prepare_cancel_convert(struct ocfs2_super *osb, |
3633 | struct ocfs2_lock_res *lockres) | |
3634 | { | |
3635 | assert_spin_locked(&lockres->l_lock); | |
3636 | ||
ccd979bd MF |
3637 | if (lockres->l_unlock_action == OCFS2_UNLOCK_CANCEL_CONVERT) { |
3638 | /* If we're already trying to cancel a lock conversion | |
3639 | * then just drop the spinlock and allow the caller to | |
3640 | * requeue this lock. */ | |
9b915181 | 3641 | mlog(ML_BASTS, "lockres %s, skip convert\n", lockres->l_name); |
ccd979bd MF |
3642 | return 0; |
3643 | } | |
3644 | ||
3645 | /* were we in a convert when we got the bast fire? */ | |
3646 | BUG_ON(lockres->l_action != OCFS2_AST_CONVERT && | |
3647 | lockres->l_action != OCFS2_AST_DOWNCONVERT); | |
3648 | /* set things up for the unlockast to know to just | |
3649 | * clear out the ast_action and unset busy, etc. */ | |
3650 | lockres->l_unlock_action = OCFS2_UNLOCK_CANCEL_CONVERT; | |
3651 | ||
3652 | mlog_bug_on_msg(!(lockres->l_flags & OCFS2_LOCK_BUSY), | |
3653 | "lock %s, invalid flags: 0x%lx\n", | |
3654 | lockres->l_name, lockres->l_flags); | |
3655 | ||
9b915181 SM |
3656 | mlog(ML_BASTS, "lockres %s\n", lockres->l_name); |
3657 | ||
ccd979bd MF |
3658 | return 1; |
3659 | } | |
3660 | ||
3661 | static int ocfs2_cancel_convert(struct ocfs2_super *osb, | |
3662 | struct ocfs2_lock_res *lockres) | |
3663 | { | |
3664 | int ret; | |
ccd979bd | 3665 | |
4670c46d | 3666 | ret = ocfs2_dlm_unlock(osb->cconn, &lockres->l_lksb, |
a796d286 | 3667 | DLM_LKF_CANCEL); |
7431cd7e JB |
3668 | if (ret) { |
3669 | ocfs2_log_dlm_error("ocfs2_dlm_unlock", ret, lockres); | |
ccd979bd MF |
3670 | ocfs2_recover_from_dlm_error(lockres, 0); |
3671 | } | |
3672 | ||
9b915181 | 3673 | mlog(ML_BASTS, "lockres %s\n", lockres->l_name); |
ccd979bd | 3674 | |
ccd979bd MF |
3675 | return ret; |
3676 | } | |
3677 | ||
b5e500e2 MF |
3678 | static int ocfs2_unblock_lock(struct ocfs2_super *osb, |
3679 | struct ocfs2_lock_res *lockres, | |
3680 | struct ocfs2_unblock_ctl *ctl) | |
ccd979bd MF |
3681 | { |
3682 | unsigned long flags; | |
3683 | int blocking; | |
3684 | int new_level; | |
079b8057 | 3685 | int level; |
ccd979bd | 3686 | int ret = 0; |
5ef0d4ea | 3687 | int set_lvb = 0; |
de551246 | 3688 | unsigned int gen; |
ccd979bd | 3689 | |
ccd979bd MF |
3690 | spin_lock_irqsave(&lockres->l_lock, flags); |
3691 | ||
ccd979bd | 3692 | recheck: |
db0f6ce6 SM |
3693 | /* |
3694 | * Is it still blocking? If not, we have no more work to do. | |
3695 | */ | |
3696 | if (!(lockres->l_flags & OCFS2_LOCK_BLOCKED)) { | |
3697 | BUG_ON(lockres->l_blocking != DLM_LOCK_NL); | |
3698 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
3699 | ret = 0; | |
3700 | goto leave; | |
3701 | } | |
3702 | ||
ccd979bd | 3703 | if (lockres->l_flags & OCFS2_LOCK_BUSY) { |
de551246 JB |
3704 | /* XXX |
3705 | * This is a *big* race. The OCFS2_LOCK_PENDING flag | |
3706 | * exists entirely for one reason - another thread has set | |
3707 | * OCFS2_LOCK_BUSY, but has *NOT* yet called dlm_lock(). | |
3708 | * | |
3709 | * If we do ocfs2_cancel_convert() before the other thread | |
3710 | * calls dlm_lock(), our cancel will do nothing. We will | |
3711 | * get no ast, and we will have no way of knowing the | |
3712 | * cancel failed. Meanwhile, the other thread will call | |
3713 | * into dlm_lock() and wait...forever. | |
3714 | * | |
3715 | * Why forever? Because another node has asked for the | |
3716 | * lock first; that's why we're here in unblock_lock(). | |
3717 | * | |
3718 | * The solution is OCFS2_LOCK_PENDING. When PENDING is | |
3719 | * set, we just requeue the unblock. Only when the other | |
3720 | * thread has called dlm_lock() and cleared PENDING will | |
3721 | * we then cancel their request. | |
3722 | * | |
3723 | * All callers of dlm_lock() must set OCFS2_DLM_PENDING | |
3724 | * at the same time they set OCFS2_DLM_BUSY. They must | |
3725 | * clear OCFS2_DLM_PENDING after dlm_lock() returns. | |
3726 | */ | |
9b915181 SM |
3727 | if (lockres->l_flags & OCFS2_LOCK_PENDING) { |
3728 | mlog(ML_BASTS, "lockres %s, ReQ: Pending\n", | |
3729 | lockres->l_name); | |
de551246 | 3730 | goto leave_requeue; |
9b915181 | 3731 | } |
de551246 | 3732 | |
d680efe9 | 3733 | ctl->requeue = 1; |
ccd979bd MF |
3734 | ret = ocfs2_prepare_cancel_convert(osb, lockres); |
3735 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
3736 | if (ret) { | |
3737 | ret = ocfs2_cancel_convert(osb, lockres); | |
3738 | if (ret < 0) | |
3739 | mlog_errno(ret); | |
3740 | } | |
3741 | goto leave; | |
3742 | } | |
3743 | ||
a1912826 SM |
3744 | /* |
3745 | * This prevents livelocks. OCFS2_LOCK_UPCONVERT_FINISHING flag is | |
3746 | * set when the ast is received for an upconvert just before the | |
3747 | * OCFS2_LOCK_BUSY flag is cleared. Now if the fs received a bast | |
3748 | * on the heels of the ast, we want to delay the downconvert just | |
3749 | * enough to allow the up requestor to do its task. Because this | |
3750 | * lock is in the blocked queue, the lock will be downconverted | |
3751 | * as soon as the requestor is done with the lock. | |
3752 | */ | |
3753 | if (lockres->l_flags & OCFS2_LOCK_UPCONVERT_FINISHING) | |
3754 | goto leave_requeue; | |
3755 | ||
0d74125a SM |
3756 | /* |
3757 | * How can we block and yet be at NL? We were trying to upconvert | |
3758 | * from NL and got canceled. The code comes back here, and now | |
3759 | * we notice and clear BLOCKING. | |
3760 | */ | |
3761 | if (lockres->l_level == DLM_LOCK_NL) { | |
3762 | BUG_ON(lockres->l_ex_holders || lockres->l_ro_holders); | |
9b915181 | 3763 | mlog(ML_BASTS, "lockres %s, Aborting dc\n", lockres->l_name); |
0d74125a SM |
3764 | lockres->l_blocking = DLM_LOCK_NL; |
3765 | lockres_clear_flags(lockres, OCFS2_LOCK_BLOCKED); | |
3766 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
3767 | goto leave; | |
3768 | } | |
3769 | ||
ccd979bd MF |
3770 | /* if we're blocking an exclusive and we have *any* holders, |
3771 | * then requeue. */ | |
bd3e7610 | 3772 | if ((lockres->l_blocking == DLM_LOCK_EX) |
9b915181 SM |
3773 | && (lockres->l_ex_holders || lockres->l_ro_holders)) { |
3774 | mlog(ML_BASTS, "lockres %s, ReQ: EX/PR Holders %u,%u\n", | |
3775 | lockres->l_name, lockres->l_ex_holders, | |
3776 | lockres->l_ro_holders); | |
f7fbfdd1 | 3777 | goto leave_requeue; |
9b915181 | 3778 | } |
ccd979bd MF |
3779 | |
3780 | /* If it's a PR we're blocking, then only | |
3781 | * requeue if we've got any EX holders */ | |
bd3e7610 | 3782 | if (lockres->l_blocking == DLM_LOCK_PR && |
9b915181 SM |
3783 | lockres->l_ex_holders) { |
3784 | mlog(ML_BASTS, "lockres %s, ReQ: EX Holders %u\n", | |
3785 | lockres->l_name, lockres->l_ex_holders); | |
f7fbfdd1 | 3786 | goto leave_requeue; |
9b915181 | 3787 | } |
f7fbfdd1 MF |
3788 | |
3789 | /* | |
3790 | * Can we get a lock in this state if the holder counts are | |
3791 | * zero? The meta data unblock code used to check this. | |
3792 | */ | |
3793 | if ((lockres->l_ops->flags & LOCK_TYPE_REQUIRES_REFRESH) | |
9b915181 SM |
3794 | && (lockres->l_flags & OCFS2_LOCK_REFRESHING)) { |
3795 | mlog(ML_BASTS, "lockres %s, ReQ: Lock Refreshing\n", | |
3796 | lockres->l_name); | |
f7fbfdd1 | 3797 | goto leave_requeue; |
9b915181 | 3798 | } |
ccd979bd | 3799 | |
16d5b956 MF |
3800 | new_level = ocfs2_highest_compat_lock_level(lockres->l_blocking); |
3801 | ||
3802 | if (lockres->l_ops->check_downconvert | |
9b915181 SM |
3803 | && !lockres->l_ops->check_downconvert(lockres, new_level)) { |
3804 | mlog(ML_BASTS, "lockres %s, ReQ: Checkpointing\n", | |
3805 | lockres->l_name); | |
16d5b956 | 3806 | goto leave_requeue; |
9b915181 | 3807 | } |
16d5b956 | 3808 | |
ccd979bd MF |
3809 | /* If we get here, then we know that there are no more |
3810 | * incompatible holders (and anyone asking for an incompatible | |
3811 | * lock is blocked). We can now downconvert the lock */ | |
cc567d89 | 3812 | if (!lockres->l_ops->downconvert_worker) |
ccd979bd MF |
3813 | goto downconvert; |
3814 | ||
3815 | /* Some lockres types want to do a bit of work before | |
3816 | * downconverting a lock. Allow that here. The worker function | |
3817 | * may sleep, so we save off a copy of what we're blocking as | |
3818 | * it may change while we're not holding the spin lock. */ | |
3819 | blocking = lockres->l_blocking; | |
079b8057 | 3820 | level = lockres->l_level; |
ccd979bd MF |
3821 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
3822 | ||
cc567d89 | 3823 | ctl->unblock_action = lockres->l_ops->downconvert_worker(lockres, blocking); |
d680efe9 | 3824 | |
9b915181 SM |
3825 | if (ctl->unblock_action == UNBLOCK_STOP_POST) { |
3826 | mlog(ML_BASTS, "lockres %s, UNBLOCK_STOP_POST\n", | |
3827 | lockres->l_name); | |
d680efe9 | 3828 | goto leave; |
9b915181 | 3829 | } |
ccd979bd MF |
3830 | |
3831 | spin_lock_irqsave(&lockres->l_lock, flags); | |
079b8057 | 3832 | if ((blocking != lockres->l_blocking) || (level != lockres->l_level)) { |
ccd979bd MF |
3833 | /* If this changed underneath us, then we can't drop |
3834 | * it just yet. */ | |
9b915181 SM |
3835 | mlog(ML_BASTS, "lockres %s, block=%d:%d, level=%d:%d, " |
3836 | "Recheck\n", lockres->l_name, blocking, | |
3837 | lockres->l_blocking, level, lockres->l_level); | |
ccd979bd MF |
3838 | goto recheck; |
3839 | } | |
3840 | ||
3841 | downconvert: | |
d680efe9 | 3842 | ctl->requeue = 0; |
ccd979bd | 3843 | |
5ef0d4ea | 3844 | if (lockres->l_ops->flags & LOCK_TYPE_USES_LVB) { |
bd3e7610 | 3845 | if (lockres->l_level == DLM_LOCK_EX) |
5ef0d4ea MF |
3846 | set_lvb = 1; |
3847 | ||
3848 | /* | |
3849 | * We only set the lvb if the lock has been fully | |
3850 | * refreshed - otherwise we risk setting stale | |
3851 | * data. Otherwise, there's no need to actually clear | |
3852 | * out the lvb here as it's value is still valid. | |
3853 | */ | |
3854 | if (set_lvb && !(lockres->l_flags & OCFS2_LOCK_NEEDS_REFRESH)) | |
3855 | lockres->l_ops->set_lvb(lockres); | |
3856 | } | |
3857 | ||
de551246 | 3858 | gen = ocfs2_prepare_downconvert(lockres, new_level); |
ccd979bd | 3859 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
de551246 JB |
3860 | ret = ocfs2_downconvert_lock(osb, lockres, new_level, set_lvb, |
3861 | gen); | |
3862 | ||
ccd979bd | 3863 | leave: |
c1e8d35e TM |
3864 | if (ret) |
3865 | mlog_errno(ret); | |
ccd979bd | 3866 | return ret; |
f7fbfdd1 MF |
3867 | |
3868 | leave_requeue: | |
3869 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
3870 | ctl->requeue = 1; | |
3871 | ||
f7fbfdd1 | 3872 | return 0; |
ccd979bd MF |
3873 | } |
3874 | ||
d680efe9 MF |
3875 | static int ocfs2_data_convert_worker(struct ocfs2_lock_res *lockres, |
3876 | int blocking) | |
ccd979bd MF |
3877 | { |
3878 | struct inode *inode; | |
3879 | struct address_space *mapping; | |
5e98d492 | 3880 | struct ocfs2_inode_info *oi; |
ccd979bd | 3881 | |
ccd979bd MF |
3882 | inode = ocfs2_lock_res_inode(lockres); |
3883 | mapping = inode->i_mapping; | |
3884 | ||
5e98d492 GR |
3885 | if (S_ISDIR(inode->i_mode)) { |
3886 | oi = OCFS2_I(inode); | |
3887 | oi->ip_dir_lock_gen++; | |
3888 | mlog(0, "generation: %u\n", oi->ip_dir_lock_gen); | |
3889 | goto out; | |
3890 | } | |
3891 | ||
1044e401 | 3892 | if (!S_ISREG(inode->i_mode)) |
f1f54068 MF |
3893 | goto out; |
3894 | ||
7f4a2a97 MF |
3895 | /* |
3896 | * We need this before the filemap_fdatawrite() so that it can | |
3897 | * transfer the dirty bit from the PTE to the | |
3898 | * page. Unfortunately this means that even for EX->PR | |
3899 | * downconverts, we'll lose our mappings and have to build | |
3900 | * them up again. | |
3901 | */ | |
3902 | unmap_mapping_range(mapping, 0, 0, 0); | |
3903 | ||
ccd979bd | 3904 | if (filemap_fdatawrite(mapping)) { |
b0697053 MF |
3905 | mlog(ML_ERROR, "Could not sync inode %llu for downconvert!", |
3906 | (unsigned long long)OCFS2_I(inode)->ip_blkno); | |
ccd979bd MF |
3907 | } |
3908 | sync_mapping_buffers(mapping); | |
bd3e7610 | 3909 | if (blocking == DLM_LOCK_EX) { |
ccd979bd | 3910 | truncate_inode_pages(mapping, 0); |
ccd979bd MF |
3911 | } else { |
3912 | /* We only need to wait on the I/O if we're not also | |
3913 | * truncating pages because truncate_inode_pages waits | |
3914 | * for us above. We don't truncate pages if we're | |
3915 | * blocking anything < EXMODE because we want to keep | |
3916 | * them around in that case. */ | |
3917 | filemap_fdatawait(mapping); | |
3918 | } | |
3919 | ||
b8a7a3a6 AG |
3920 | forget_all_cached_acls(inode); |
3921 | ||
f1f54068 | 3922 | out: |
d680efe9 | 3923 | return UNBLOCK_CONTINUE; |
ccd979bd MF |
3924 | } |
3925 | ||
a4338481 TM |
3926 | static int ocfs2_ci_checkpointed(struct ocfs2_caching_info *ci, |
3927 | struct ocfs2_lock_res *lockres, | |
3928 | int new_level) | |
810d5aeb | 3929 | { |
a4338481 | 3930 | int checkpointed = ocfs2_ci_fully_checkpointed(ci); |
810d5aeb | 3931 | |
bd3e7610 JB |
3932 | BUG_ON(new_level != DLM_LOCK_NL && new_level != DLM_LOCK_PR); |
3933 | BUG_ON(lockres->l_level != DLM_LOCK_EX && !checkpointed); | |
810d5aeb MF |
3934 | |
3935 | if (checkpointed) | |
3936 | return 1; | |
3937 | ||
a4338481 | 3938 | ocfs2_start_checkpoint(OCFS2_SB(ocfs2_metadata_cache_get_super(ci))); |
810d5aeb MF |
3939 | return 0; |
3940 | } | |
3941 | ||
a4338481 TM |
3942 | static int ocfs2_check_meta_downconvert(struct ocfs2_lock_res *lockres, |
3943 | int new_level) | |
3944 | { | |
3945 | struct inode *inode = ocfs2_lock_res_inode(lockres); | |
3946 | ||
3947 | return ocfs2_ci_checkpointed(INODE_CACHE(inode), lockres, new_level); | |
3948 | } | |
3949 | ||
810d5aeb MF |
3950 | static void ocfs2_set_meta_lvb(struct ocfs2_lock_res *lockres) |
3951 | { | |
3952 | struct inode *inode = ocfs2_lock_res_inode(lockres); | |
3953 | ||
3954 | __ocfs2_stuff_meta_lvb(inode); | |
3955 | } | |
3956 | ||
d680efe9 MF |
3957 | /* |
3958 | * Does the final reference drop on our dentry lock. Right now this | |
34d024f8 | 3959 | * happens in the downconvert thread, but we could choose to simplify the |
d680efe9 MF |
3960 | * dlmglue API and push these off to the ocfs2_wq in the future. |
3961 | */ | |
3962 | static void ocfs2_dentry_post_unlock(struct ocfs2_super *osb, | |
3963 | struct ocfs2_lock_res *lockres) | |
3964 | { | |
3965 | struct ocfs2_dentry_lock *dl = ocfs2_lock_res_dl(lockres); | |
3966 | ocfs2_dentry_lock_put(osb, dl); | |
3967 | } | |
3968 | ||
3969 | /* | |
3970 | * d_delete() matching dentries before the lock downconvert. | |
3971 | * | |
3972 | * At this point, any process waiting to destroy the | |
3973 | * dentry_lock due to last ref count is stopped by the | |
3974 | * OCFS2_LOCK_QUEUED flag. | |
3975 | * | |
3976 | * We have two potential problems | |
3977 | * | |
3978 | * 1) If we do the last reference drop on our dentry_lock (via dput) | |
3979 | * we'll wind up in ocfs2_release_dentry_lock(), waiting on | |
3980 | * the downconvert to finish. Instead we take an elevated | |
3981 | * reference and push the drop until after we've completed our | |
3982 | * unblock processing. | |
3983 | * | |
3984 | * 2) There might be another process with a final reference, | |
3985 | * waiting on us to finish processing. If this is the case, we | |
3986 | * detect it and exit out - there's no more dentries anyway. | |
3987 | */ | |
3988 | static int ocfs2_dentry_convert_worker(struct ocfs2_lock_res *lockres, | |
3989 | int blocking) | |
3990 | { | |
3991 | struct ocfs2_dentry_lock *dl = ocfs2_lock_res_dl(lockres); | |
3992 | struct ocfs2_inode_info *oi = OCFS2_I(dl->dl_inode); | |
3993 | struct dentry *dentry; | |
3994 | unsigned long flags; | |
3995 | int extra_ref = 0; | |
3996 | ||
3997 | /* | |
3998 | * This node is blocking another node from getting a read | |
3999 | * lock. This happens when we've renamed within a | |
4000 | * directory. We've forced the other nodes to d_delete(), but | |
4001 | * we never actually dropped our lock because it's still | |
4002 | * valid. The downconvert code will retain a PR for this node, | |
4003 | * so there's no further work to do. | |
4004 | */ | |
bd3e7610 | 4005 | if (blocking == DLM_LOCK_PR) |
d680efe9 MF |
4006 | return UNBLOCK_CONTINUE; |
4007 | ||
4008 | /* | |
4009 | * Mark this inode as potentially orphaned. The code in | |
4010 | * ocfs2_delete_inode() will figure out whether it actually | |
4011 | * needs to be freed or not. | |
4012 | */ | |
4013 | spin_lock(&oi->ip_lock); | |
4014 | oi->ip_flags |= OCFS2_INODE_MAYBE_ORPHANED; | |
4015 | spin_unlock(&oi->ip_lock); | |
4016 | ||
4017 | /* | |
4018 | * Yuck. We need to make sure however that the check of | |
4019 | * OCFS2_LOCK_FREEING and the extra reference are atomic with | |
4020 | * respect to a reference decrement or the setting of that | |
4021 | * flag. | |
4022 | */ | |
4023 | spin_lock_irqsave(&lockres->l_lock, flags); | |
4024 | spin_lock(&dentry_attach_lock); | |
4025 | if (!(lockres->l_flags & OCFS2_LOCK_FREEING) | |
4026 | && dl->dl_count) { | |
4027 | dl->dl_count++; | |
4028 | extra_ref = 1; | |
4029 | } | |
4030 | spin_unlock(&dentry_attach_lock); | |
4031 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
4032 | ||
4033 | mlog(0, "extra_ref = %d\n", extra_ref); | |
4034 | ||
4035 | /* | |
4036 | * We have a process waiting on us in ocfs2_dentry_iput(), | |
4037 | * which means we can't have any more outstanding | |
4038 | * aliases. There's no need to do any more work. | |
4039 | */ | |
4040 | if (!extra_ref) | |
4041 | return UNBLOCK_CONTINUE; | |
4042 | ||
4043 | spin_lock(&dentry_attach_lock); | |
4044 | while (1) { | |
4045 | dentry = ocfs2_find_local_alias(dl->dl_inode, | |
4046 | dl->dl_parent_blkno, 1); | |
4047 | if (!dentry) | |
4048 | break; | |
4049 | spin_unlock(&dentry_attach_lock); | |
4050 | ||
10ab8811 | 4051 | if (S_ISDIR(dl->dl_inode->i_mode)) |
4052 | shrink_dcache_parent(dentry); | |
4053 | ||
a455589f | 4054 | mlog(0, "d_delete(%pd);\n", dentry); |
d680efe9 MF |
4055 | |
4056 | /* | |
4057 | * The following dcache calls may do an | |
4058 | * iput(). Normally we don't want that from the | |
4059 | * downconverting thread, but in this case it's ok | |
4060 | * because the requesting node already has an | |
4061 | * exclusive lock on the inode, so it can't be queued | |
4062 | * for a downconvert. | |
4063 | */ | |
4064 | d_delete(dentry); | |
4065 | dput(dentry); | |
4066 | ||
4067 | spin_lock(&dentry_attach_lock); | |
4068 | } | |
4069 | spin_unlock(&dentry_attach_lock); | |
4070 | ||
4071 | /* | |
4072 | * If we are the last holder of this dentry lock, there is no | |
4073 | * reason to downconvert so skip straight to the unlock. | |
4074 | */ | |
4075 | if (dl->dl_count == 1) | |
4076 | return UNBLOCK_STOP_POST; | |
4077 | ||
4078 | return UNBLOCK_CONTINUE_POST; | |
4079 | } | |
4080 | ||
8dec98ed TM |
4081 | static int ocfs2_check_refcount_downconvert(struct ocfs2_lock_res *lockres, |
4082 | int new_level) | |
4083 | { | |
4084 | struct ocfs2_refcount_tree *tree = | |
4085 | ocfs2_lock_res_refcount_tree(lockres); | |
4086 | ||
4087 | return ocfs2_ci_checkpointed(&tree->rf_ci, lockres, new_level); | |
4088 | } | |
4089 | ||
4090 | static int ocfs2_refcount_convert_worker(struct ocfs2_lock_res *lockres, | |
4091 | int blocking) | |
4092 | { | |
4093 | struct ocfs2_refcount_tree *tree = | |
4094 | ocfs2_lock_res_refcount_tree(lockres); | |
4095 | ||
4096 | ocfs2_metadata_cache_purge(&tree->rf_ci); | |
4097 | ||
4098 | return UNBLOCK_CONTINUE; | |
4099 | } | |
4100 | ||
9e33d69f JK |
4101 | static void ocfs2_set_qinfo_lvb(struct ocfs2_lock_res *lockres) |
4102 | { | |
4103 | struct ocfs2_qinfo_lvb *lvb; | |
4104 | struct ocfs2_mem_dqinfo *oinfo = ocfs2_lock_res_qinfo(lockres); | |
4105 | struct mem_dqinfo *info = sb_dqinfo(oinfo->dqi_gi.dqi_sb, | |
4106 | oinfo->dqi_gi.dqi_type); | |
4107 | ||
a641dc2a | 4108 | lvb = ocfs2_dlm_lvb(&lockres->l_lksb); |
9e33d69f JK |
4109 | lvb->lvb_version = OCFS2_QINFO_LVB_VERSION; |
4110 | lvb->lvb_bgrace = cpu_to_be32(info->dqi_bgrace); | |
4111 | lvb->lvb_igrace = cpu_to_be32(info->dqi_igrace); | |
4112 | lvb->lvb_syncms = cpu_to_be32(oinfo->dqi_syncms); | |
4113 | lvb->lvb_blocks = cpu_to_be32(oinfo->dqi_gi.dqi_blocks); | |
4114 | lvb->lvb_free_blk = cpu_to_be32(oinfo->dqi_gi.dqi_free_blk); | |
4115 | lvb->lvb_free_entry = cpu_to_be32(oinfo->dqi_gi.dqi_free_entry); | |
9e33d69f JK |
4116 | } |
4117 | ||
4118 | void ocfs2_qinfo_unlock(struct ocfs2_mem_dqinfo *oinfo, int ex) | |
4119 | { | |
4120 | struct ocfs2_lock_res *lockres = &oinfo->dqi_gqlock; | |
4121 | struct ocfs2_super *osb = OCFS2_SB(oinfo->dqi_gi.dqi_sb); | |
4122 | int level = ex ? DLM_LOCK_EX : DLM_LOCK_PR; | |
4123 | ||
9e33d69f JK |
4124 | if (!ocfs2_is_hard_readonly(osb) && !ocfs2_mount_local(osb)) |
4125 | ocfs2_cluster_unlock(osb, lockres, level); | |
9e33d69f JK |
4126 | } |
4127 | ||
4128 | static int ocfs2_refresh_qinfo(struct ocfs2_mem_dqinfo *oinfo) | |
4129 | { | |
4130 | struct mem_dqinfo *info = sb_dqinfo(oinfo->dqi_gi.dqi_sb, | |
4131 | oinfo->dqi_gi.dqi_type); | |
4132 | struct ocfs2_lock_res *lockres = &oinfo->dqi_gqlock; | |
4133 | struct ocfs2_qinfo_lvb *lvb = ocfs2_dlm_lvb(&lockres->l_lksb); | |
85eb8b73 | 4134 | struct buffer_head *bh = NULL; |
9e33d69f JK |
4135 | struct ocfs2_global_disk_dqinfo *gdinfo; |
4136 | int status = 0; | |
4137 | ||
1c520dfb JB |
4138 | if (ocfs2_dlm_lvb_valid(&lockres->l_lksb) && |
4139 | lvb->lvb_version == OCFS2_QINFO_LVB_VERSION) { | |
9e33d69f JK |
4140 | info->dqi_bgrace = be32_to_cpu(lvb->lvb_bgrace); |
4141 | info->dqi_igrace = be32_to_cpu(lvb->lvb_igrace); | |
4142 | oinfo->dqi_syncms = be32_to_cpu(lvb->lvb_syncms); | |
4143 | oinfo->dqi_gi.dqi_blocks = be32_to_cpu(lvb->lvb_blocks); | |
4144 | oinfo->dqi_gi.dqi_free_blk = be32_to_cpu(lvb->lvb_free_blk); | |
4145 | oinfo->dqi_gi.dqi_free_entry = | |
4146 | be32_to_cpu(lvb->lvb_free_entry); | |
4147 | } else { | |
ae4f6ef1 JK |
4148 | status = ocfs2_read_quota_phys_block(oinfo->dqi_gqinode, |
4149 | oinfo->dqi_giblk, &bh); | |
85eb8b73 | 4150 | if (status) { |
9e33d69f JK |
4151 | mlog_errno(status); |
4152 | goto bail; | |
4153 | } | |
4154 | gdinfo = (struct ocfs2_global_disk_dqinfo *) | |
4155 | (bh->b_data + OCFS2_GLOBAL_INFO_OFF); | |
4156 | info->dqi_bgrace = le32_to_cpu(gdinfo->dqi_bgrace); | |
4157 | info->dqi_igrace = le32_to_cpu(gdinfo->dqi_igrace); | |
4158 | oinfo->dqi_syncms = le32_to_cpu(gdinfo->dqi_syncms); | |
4159 | oinfo->dqi_gi.dqi_blocks = le32_to_cpu(gdinfo->dqi_blocks); | |
4160 | oinfo->dqi_gi.dqi_free_blk = le32_to_cpu(gdinfo->dqi_free_blk); | |
4161 | oinfo->dqi_gi.dqi_free_entry = | |
4162 | le32_to_cpu(gdinfo->dqi_free_entry); | |
4163 | brelse(bh); | |
4164 | ocfs2_track_lock_refresh(lockres); | |
4165 | } | |
4166 | ||
4167 | bail: | |
4168 | return status; | |
4169 | } | |
4170 | ||
4171 | /* Lock quota info, this function expects at least shared lock on the quota file | |
4172 | * so that we can safely refresh quota info from disk. */ | |
4173 | int ocfs2_qinfo_lock(struct ocfs2_mem_dqinfo *oinfo, int ex) | |
4174 | { | |
4175 | struct ocfs2_lock_res *lockres = &oinfo->dqi_gqlock; | |
4176 | struct ocfs2_super *osb = OCFS2_SB(oinfo->dqi_gi.dqi_sb); | |
4177 | int level = ex ? DLM_LOCK_EX : DLM_LOCK_PR; | |
4178 | int status = 0; | |
4179 | ||
9e33d69f JK |
4180 | /* On RO devices, locking really isn't needed... */ |
4181 | if (ocfs2_is_hard_readonly(osb)) { | |
4182 | if (ex) | |
4183 | status = -EROFS; | |
4184 | goto bail; | |
4185 | } | |
4186 | if (ocfs2_mount_local(osb)) | |
4187 | goto bail; | |
4188 | ||
4189 | status = ocfs2_cluster_lock(osb, lockres, level, 0, 0); | |
4190 | if (status < 0) { | |
4191 | mlog_errno(status); | |
4192 | goto bail; | |
4193 | } | |
4194 | if (!ocfs2_should_refresh_lock_res(lockres)) | |
4195 | goto bail; | |
4196 | /* OK, we have the lock but we need to refresh the quota info */ | |
4197 | status = ocfs2_refresh_qinfo(oinfo); | |
4198 | if (status) | |
4199 | ocfs2_qinfo_unlock(oinfo, ex); | |
4200 | ocfs2_complete_lock_res_refresh(lockres, status); | |
4201 | bail: | |
9e33d69f JK |
4202 | return status; |
4203 | } | |
4204 | ||
8dec98ed TM |
4205 | int ocfs2_refcount_lock(struct ocfs2_refcount_tree *ref_tree, int ex) |
4206 | { | |
4207 | int status; | |
4208 | int level = ex ? DLM_LOCK_EX : DLM_LOCK_PR; | |
4209 | struct ocfs2_lock_res *lockres = &ref_tree->rf_lockres; | |
4210 | struct ocfs2_super *osb = lockres->l_priv; | |
4211 | ||
4212 | ||
4213 | if (ocfs2_is_hard_readonly(osb)) | |
4214 | return -EROFS; | |
4215 | ||
4216 | if (ocfs2_mount_local(osb)) | |
4217 | return 0; | |
4218 | ||
4219 | status = ocfs2_cluster_lock(osb, lockres, level, 0, 0); | |
4220 | if (status < 0) | |
4221 | mlog_errno(status); | |
4222 | ||
4223 | return status; | |
4224 | } | |
4225 | ||
4226 | void ocfs2_refcount_unlock(struct ocfs2_refcount_tree *ref_tree, int ex) | |
4227 | { | |
4228 | int level = ex ? DLM_LOCK_EX : DLM_LOCK_PR; | |
4229 | struct ocfs2_lock_res *lockres = &ref_tree->rf_lockres; | |
4230 | struct ocfs2_super *osb = lockres->l_priv; | |
4231 | ||
4232 | if (!ocfs2_mount_local(osb)) | |
4233 | ocfs2_cluster_unlock(osb, lockres, level); | |
4234 | } | |
4235 | ||
00600056 AB |
4236 | static void ocfs2_process_blocked_lock(struct ocfs2_super *osb, |
4237 | struct ocfs2_lock_res *lockres) | |
ccd979bd MF |
4238 | { |
4239 | int status; | |
d680efe9 | 4240 | struct ocfs2_unblock_ctl ctl = {0, 0,}; |
ccd979bd MF |
4241 | unsigned long flags; |
4242 | ||
4243 | /* Our reference to the lockres in this function can be | |
4244 | * considered valid until we remove the OCFS2_LOCK_QUEUED | |
4245 | * flag. */ | |
4246 | ||
ccd979bd MF |
4247 | BUG_ON(!lockres); |
4248 | BUG_ON(!lockres->l_ops); | |
ccd979bd | 4249 | |
9b915181 | 4250 | mlog(ML_BASTS, "lockres %s blocked\n", lockres->l_name); |
ccd979bd MF |
4251 | |
4252 | /* Detect whether a lock has been marked as going away while | |
34d024f8 | 4253 | * the downconvert thread was processing other things. A lock can |
ccd979bd MF |
4254 | * still be marked with OCFS2_LOCK_FREEING after this check, |
4255 | * but short circuiting here will still save us some | |
4256 | * performance. */ | |
4257 | spin_lock_irqsave(&lockres->l_lock, flags); | |
4258 | if (lockres->l_flags & OCFS2_LOCK_FREEING) | |
4259 | goto unqueue; | |
4260 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
4261 | ||
b5e500e2 | 4262 | status = ocfs2_unblock_lock(osb, lockres, &ctl); |
ccd979bd MF |
4263 | if (status < 0) |
4264 | mlog_errno(status); | |
4265 | ||
4266 | spin_lock_irqsave(&lockres->l_lock, flags); | |
4267 | unqueue: | |
d680efe9 | 4268 | if (lockres->l_flags & OCFS2_LOCK_FREEING || !ctl.requeue) { |
ccd979bd MF |
4269 | lockres_clear_flags(lockres, OCFS2_LOCK_QUEUED); |
4270 | } else | |
4271 | ocfs2_schedule_blocked_lock(osb, lockres); | |
4272 | ||
9b915181 | 4273 | mlog(ML_BASTS, "lockres %s, requeue = %s.\n", lockres->l_name, |
d680efe9 | 4274 | ctl.requeue ? "yes" : "no"); |
ccd979bd MF |
4275 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
4276 | ||
d680efe9 MF |
4277 | if (ctl.unblock_action != UNBLOCK_CONTINUE |
4278 | && lockres->l_ops->post_unlock) | |
4279 | lockres->l_ops->post_unlock(osb, lockres); | |
ccd979bd MF |
4280 | } |
4281 | ||
4282 | static void ocfs2_schedule_blocked_lock(struct ocfs2_super *osb, | |
4283 | struct ocfs2_lock_res *lockres) | |
4284 | { | |
a75e9cca SE |
4285 | unsigned long flags; |
4286 | ||
ccd979bd MF |
4287 | assert_spin_locked(&lockres->l_lock); |
4288 | ||
4289 | if (lockres->l_flags & OCFS2_LOCK_FREEING) { | |
4290 | /* Do not schedule a lock for downconvert when it's on | |
4291 | * the way to destruction - any nodes wanting access | |
4292 | * to the resource will get it soon. */ | |
9b915181 | 4293 | mlog(ML_BASTS, "lockres %s won't be scheduled: flags 0x%lx\n", |
ccd979bd MF |
4294 | lockres->l_name, lockres->l_flags); |
4295 | return; | |
4296 | } | |
4297 | ||
4298 | lockres_or_flags(lockres, OCFS2_LOCK_QUEUED); | |
4299 | ||
a75e9cca | 4300 | spin_lock_irqsave(&osb->dc_task_lock, flags); |
ccd979bd MF |
4301 | if (list_empty(&lockres->l_blocked_list)) { |
4302 | list_add_tail(&lockres->l_blocked_list, | |
4303 | &osb->blocked_lock_list); | |
4304 | osb->blocked_lock_count++; | |
4305 | } | |
a75e9cca | 4306 | spin_unlock_irqrestore(&osb->dc_task_lock, flags); |
ccd979bd | 4307 | } |
34d024f8 MF |
4308 | |
4309 | static void ocfs2_downconvert_thread_do_work(struct ocfs2_super *osb) | |
4310 | { | |
4311 | unsigned long processed; | |
a75e9cca | 4312 | unsigned long flags; |
34d024f8 MF |
4313 | struct ocfs2_lock_res *lockres; |
4314 | ||
a75e9cca | 4315 | spin_lock_irqsave(&osb->dc_task_lock, flags); |
34d024f8 MF |
4316 | /* grab this early so we know to try again if a state change and |
4317 | * wake happens part-way through our work */ | |
4318 | osb->dc_work_sequence = osb->dc_wake_sequence; | |
4319 | ||
4320 | processed = osb->blocked_lock_count; | |
209f7512 JQ |
4321 | /* |
4322 | * blocked lock processing in this loop might call iput which can | |
4323 | * remove items off osb->blocked_lock_list. Downconvert up to | |
4324 | * 'processed' number of locks, but stop short if we had some | |
4325 | * removed in ocfs2_mark_lockres_freeing when downconverting. | |
4326 | */ | |
4327 | while (processed && !list_empty(&osb->blocked_lock_list)) { | |
34d024f8 MF |
4328 | lockres = list_entry(osb->blocked_lock_list.next, |
4329 | struct ocfs2_lock_res, l_blocked_list); | |
4330 | list_del_init(&lockres->l_blocked_list); | |
4331 | osb->blocked_lock_count--; | |
a75e9cca | 4332 | spin_unlock_irqrestore(&osb->dc_task_lock, flags); |
34d024f8 MF |
4333 | |
4334 | BUG_ON(!processed); | |
4335 | processed--; | |
4336 | ||
4337 | ocfs2_process_blocked_lock(osb, lockres); | |
4338 | ||
a75e9cca | 4339 | spin_lock_irqsave(&osb->dc_task_lock, flags); |
34d024f8 | 4340 | } |
a75e9cca | 4341 | spin_unlock_irqrestore(&osb->dc_task_lock, flags); |
34d024f8 MF |
4342 | } |
4343 | ||
4344 | static int ocfs2_downconvert_thread_lists_empty(struct ocfs2_super *osb) | |
4345 | { | |
4346 | int empty = 0; | |
a75e9cca | 4347 | unsigned long flags; |
34d024f8 | 4348 | |
a75e9cca | 4349 | spin_lock_irqsave(&osb->dc_task_lock, flags); |
34d024f8 MF |
4350 | if (list_empty(&osb->blocked_lock_list)) |
4351 | empty = 1; | |
4352 | ||
a75e9cca | 4353 | spin_unlock_irqrestore(&osb->dc_task_lock, flags); |
34d024f8 MF |
4354 | return empty; |
4355 | } | |
4356 | ||
4357 | static int ocfs2_downconvert_thread_should_wake(struct ocfs2_super *osb) | |
4358 | { | |
4359 | int should_wake = 0; | |
a75e9cca | 4360 | unsigned long flags; |
34d024f8 | 4361 | |
a75e9cca | 4362 | spin_lock_irqsave(&osb->dc_task_lock, flags); |
34d024f8 MF |
4363 | if (osb->dc_work_sequence != osb->dc_wake_sequence) |
4364 | should_wake = 1; | |
a75e9cca | 4365 | spin_unlock_irqrestore(&osb->dc_task_lock, flags); |
34d024f8 MF |
4366 | |
4367 | return should_wake; | |
4368 | } | |
4369 | ||
200bfae3 | 4370 | static int ocfs2_downconvert_thread(void *arg) |
34d024f8 MF |
4371 | { |
4372 | int status = 0; | |
4373 | struct ocfs2_super *osb = arg; | |
4374 | ||
4375 | /* only quit once we've been asked to stop and there is no more | |
4376 | * work available */ | |
4377 | while (!(kthread_should_stop() && | |
4378 | ocfs2_downconvert_thread_lists_empty(osb))) { | |
4379 | ||
4380 | wait_event_interruptible(osb->dc_event, | |
4381 | ocfs2_downconvert_thread_should_wake(osb) || | |
4382 | kthread_should_stop()); | |
4383 | ||
4384 | mlog(0, "downconvert_thread: awoken\n"); | |
4385 | ||
4386 | ocfs2_downconvert_thread_do_work(osb); | |
4387 | } | |
4388 | ||
4389 | osb->dc_task = NULL; | |
4390 | return status; | |
4391 | } | |
4392 | ||
4393 | void ocfs2_wake_downconvert_thread(struct ocfs2_super *osb) | |
4394 | { | |
a75e9cca SE |
4395 | unsigned long flags; |
4396 | ||
4397 | spin_lock_irqsave(&osb->dc_task_lock, flags); | |
34d024f8 MF |
4398 | /* make sure the voting thread gets a swipe at whatever changes |
4399 | * the caller may have made to the voting state */ | |
4400 | osb->dc_wake_sequence++; | |
a75e9cca | 4401 | spin_unlock_irqrestore(&osb->dc_task_lock, flags); |
34d024f8 MF |
4402 | wake_up(&osb->dc_event); |
4403 | } |