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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 | ||
5500ab4e GH |
689 | /* Only one trimfs thread are allowed to work at the same time. */ |
690 | mutex_lock(&osb->obs_trim_fs_mutex); | |
691 | ||
4882abeb GH |
692 | ocfs2_lock_res_init_once(lockres); |
693 | ocfs2_build_lock_name(OCFS2_LOCK_TYPE_TRIM_FS, 0, 0, lockres->l_name); | |
694 | ocfs2_lock_res_init_common(osb, lockres, OCFS2_LOCK_TYPE_TRIM_FS, | |
695 | &ocfs2_trim_fs_lops, osb); | |
696 | } | |
697 | ||
698 | void ocfs2_trim_fs_lock_res_uninit(struct ocfs2_super *osb) | |
699 | { | |
700 | struct ocfs2_lock_res *lockres = &osb->osb_trim_fs_lockres; | |
701 | ||
702 | ocfs2_simple_drop_lockres(osb, lockres); | |
703 | ocfs2_lock_res_free(lockres); | |
5500ab4e GH |
704 | |
705 | mutex_unlock(&osb->obs_trim_fs_mutex); | |
4882abeb GH |
706 | } |
707 | ||
83273932 SE |
708 | static void ocfs2_orphan_scan_lock_res_init(struct ocfs2_lock_res *res, |
709 | struct ocfs2_super *osb) | |
710 | { | |
83273932 SE |
711 | ocfs2_lock_res_init_once(res); |
712 | ocfs2_build_lock_name(OCFS2_LOCK_TYPE_ORPHAN_SCAN, 0, 0, res->l_name); | |
713 | ocfs2_lock_res_init_common(osb, res, OCFS2_LOCK_TYPE_ORPHAN_SCAN, | |
714 | &ocfs2_orphan_scan_lops, osb); | |
83273932 SE |
715 | } |
716 | ||
cf8e06f1 MF |
717 | void ocfs2_file_lock_res_init(struct ocfs2_lock_res *lockres, |
718 | struct ocfs2_file_private *fp) | |
719 | { | |
720 | struct inode *inode = fp->fp_file->f_mapping->host; | |
721 | struct ocfs2_inode_info *oi = OCFS2_I(inode); | |
722 | ||
723 | ocfs2_lock_res_init_once(lockres); | |
724 | ocfs2_build_lock_name(OCFS2_LOCK_TYPE_FLOCK, oi->ip_blkno, | |
725 | inode->i_generation, lockres->l_name); | |
726 | ocfs2_lock_res_init_common(OCFS2_SB(inode->i_sb), lockres, | |
727 | OCFS2_LOCK_TYPE_FLOCK, &ocfs2_flock_lops, | |
728 | fp); | |
729 | lockres->l_flags |= OCFS2_LOCK_NOCACHE; | |
730 | } | |
731 | ||
9e33d69f JK |
732 | void ocfs2_qinfo_lock_res_init(struct ocfs2_lock_res *lockres, |
733 | struct ocfs2_mem_dqinfo *info) | |
734 | { | |
735 | ocfs2_lock_res_init_once(lockres); | |
736 | ocfs2_build_lock_name(OCFS2_LOCK_TYPE_QINFO, info->dqi_gi.dqi_type, | |
737 | 0, lockres->l_name); | |
738 | ocfs2_lock_res_init_common(OCFS2_SB(info->dqi_gi.dqi_sb), lockres, | |
739 | OCFS2_LOCK_TYPE_QINFO, &ocfs2_qinfo_lops, | |
740 | info); | |
741 | } | |
742 | ||
8dec98ed TM |
743 | void ocfs2_refcount_lock_res_init(struct ocfs2_lock_res *lockres, |
744 | struct ocfs2_super *osb, u64 ref_blkno, | |
745 | unsigned int generation) | |
746 | { | |
747 | ocfs2_lock_res_init_once(lockres); | |
748 | ocfs2_build_lock_name(OCFS2_LOCK_TYPE_REFCOUNT, ref_blkno, | |
749 | generation, lockres->l_name); | |
750 | ocfs2_lock_res_init_common(osb, lockres, OCFS2_LOCK_TYPE_REFCOUNT, | |
751 | &ocfs2_refcount_block_lops, osb); | |
752 | } | |
753 | ||
ccd979bd MF |
754 | void ocfs2_lock_res_free(struct ocfs2_lock_res *res) |
755 | { | |
ccd979bd MF |
756 | if (!(res->l_flags & OCFS2_LOCK_INITIALIZED)) |
757 | return; | |
758 | ||
759 | ocfs2_remove_lockres_tracking(res); | |
760 | ||
761 | mlog_bug_on_msg(!list_empty(&res->l_blocked_list), | |
762 | "Lockres %s is on the blocked list\n", | |
763 | res->l_name); | |
764 | mlog_bug_on_msg(!list_empty(&res->l_mask_waiters), | |
765 | "Lockres %s has mask waiters pending\n", | |
766 | res->l_name); | |
767 | mlog_bug_on_msg(spin_is_locked(&res->l_lock), | |
768 | "Lockres %s is locked\n", | |
769 | res->l_name); | |
770 | mlog_bug_on_msg(res->l_ro_holders, | |
771 | "Lockres %s has %u ro holders\n", | |
772 | res->l_name, res->l_ro_holders); | |
773 | mlog_bug_on_msg(res->l_ex_holders, | |
774 | "Lockres %s has %u ex holders\n", | |
775 | res->l_name, res->l_ex_holders); | |
776 | ||
777 | /* Need to clear out the lock status block for the dlm */ | |
778 | memset(&res->l_lksb, 0, sizeof(res->l_lksb)); | |
779 | ||
780 | res->l_flags = 0UL; | |
ccd979bd MF |
781 | } |
782 | ||
439a36b8 ER |
783 | /* |
784 | * Keep a list of processes who have interest in a lockres. | |
785 | * Note: this is now only uesed for check recursive cluster locking. | |
786 | */ | |
787 | static inline void ocfs2_add_holder(struct ocfs2_lock_res *lockres, | |
788 | struct ocfs2_lock_holder *oh) | |
789 | { | |
790 | INIT_LIST_HEAD(&oh->oh_list); | |
791 | oh->oh_owner_pid = get_pid(task_pid(current)); | |
792 | ||
793 | spin_lock(&lockres->l_lock); | |
794 | list_add_tail(&oh->oh_list, &lockres->l_holders); | |
795 | spin_unlock(&lockres->l_lock); | |
796 | } | |
797 | ||
133b81f2 LC |
798 | static struct ocfs2_lock_holder * |
799 | ocfs2_pid_holder(struct ocfs2_lock_res *lockres, | |
800 | struct pid *pid) | |
439a36b8 ER |
801 | { |
802 | struct ocfs2_lock_holder *oh; | |
439a36b8 | 803 | |
439a36b8 | 804 | spin_lock(&lockres->l_lock); |
439a36b8 ER |
805 | list_for_each_entry(oh, &lockres->l_holders, oh_list) { |
806 | if (oh->oh_owner_pid == pid) { | |
807 | spin_unlock(&lockres->l_lock); | |
133b81f2 | 808 | return oh; |
439a36b8 ER |
809 | } |
810 | } | |
811 | spin_unlock(&lockres->l_lock); | |
133b81f2 LC |
812 | return NULL; |
813 | } | |
439a36b8 | 814 | |
133b81f2 LC |
815 | static inline void ocfs2_remove_holder(struct ocfs2_lock_res *lockres, |
816 | struct ocfs2_lock_holder *oh) | |
817 | { | |
818 | spin_lock(&lockres->l_lock); | |
819 | list_del(&oh->oh_list); | |
820 | spin_unlock(&lockres->l_lock); | |
821 | ||
822 | put_pid(oh->oh_owner_pid); | |
439a36b8 ER |
823 | } |
824 | ||
133b81f2 | 825 | |
ccd979bd MF |
826 | static inline void ocfs2_inc_holders(struct ocfs2_lock_res *lockres, |
827 | int level) | |
828 | { | |
ccd979bd MF |
829 | BUG_ON(!lockres); |
830 | ||
831 | switch(level) { | |
bd3e7610 | 832 | case DLM_LOCK_EX: |
ccd979bd MF |
833 | lockres->l_ex_holders++; |
834 | break; | |
bd3e7610 | 835 | case DLM_LOCK_PR: |
ccd979bd MF |
836 | lockres->l_ro_holders++; |
837 | break; | |
838 | default: | |
839 | BUG(); | |
840 | } | |
ccd979bd MF |
841 | } |
842 | ||
843 | static inline void ocfs2_dec_holders(struct ocfs2_lock_res *lockres, | |
844 | int level) | |
845 | { | |
ccd979bd MF |
846 | BUG_ON(!lockres); |
847 | ||
848 | switch(level) { | |
bd3e7610 | 849 | case DLM_LOCK_EX: |
ccd979bd MF |
850 | BUG_ON(!lockres->l_ex_holders); |
851 | lockres->l_ex_holders--; | |
852 | break; | |
bd3e7610 | 853 | case DLM_LOCK_PR: |
ccd979bd MF |
854 | BUG_ON(!lockres->l_ro_holders); |
855 | lockres->l_ro_holders--; | |
856 | break; | |
857 | default: | |
858 | BUG(); | |
859 | } | |
ccd979bd MF |
860 | } |
861 | ||
862 | /* WARNING: This function lives in a world where the only three lock | |
863 | * levels are EX, PR, and NL. It *will* have to be adjusted when more | |
864 | * lock types are added. */ | |
865 | static inline int ocfs2_highest_compat_lock_level(int level) | |
866 | { | |
bd3e7610 | 867 | int new_level = DLM_LOCK_EX; |
ccd979bd | 868 | |
bd3e7610 JB |
869 | if (level == DLM_LOCK_EX) |
870 | new_level = DLM_LOCK_NL; | |
871 | else if (level == DLM_LOCK_PR) | |
872 | new_level = DLM_LOCK_PR; | |
ccd979bd MF |
873 | return new_level; |
874 | } | |
875 | ||
876 | static void lockres_set_flags(struct ocfs2_lock_res *lockres, | |
877 | unsigned long newflags) | |
878 | { | |
800deef3 | 879 | struct ocfs2_mask_waiter *mw, *tmp; |
ccd979bd MF |
880 | |
881 | assert_spin_locked(&lockres->l_lock); | |
882 | ||
883 | lockres->l_flags = newflags; | |
884 | ||
800deef3 | 885 | list_for_each_entry_safe(mw, tmp, &lockres->l_mask_waiters, mw_item) { |
ccd979bd MF |
886 | if ((lockres->l_flags & mw->mw_mask) != mw->mw_goal) |
887 | continue; | |
888 | ||
889 | list_del_init(&mw->mw_item); | |
890 | mw->mw_status = 0; | |
891 | complete(&mw->mw_complete); | |
892 | } | |
893 | } | |
894 | static void lockres_or_flags(struct ocfs2_lock_res *lockres, unsigned long or) | |
895 | { | |
896 | lockres_set_flags(lockres, lockres->l_flags | or); | |
897 | } | |
898 | static void lockres_clear_flags(struct ocfs2_lock_res *lockres, | |
899 | unsigned long clear) | |
900 | { | |
901 | lockres_set_flags(lockres, lockres->l_flags & ~clear); | |
902 | } | |
903 | ||
904 | static inline void ocfs2_generic_handle_downconvert_action(struct ocfs2_lock_res *lockres) | |
905 | { | |
ccd979bd MF |
906 | BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BUSY)); |
907 | BUG_ON(!(lockres->l_flags & OCFS2_LOCK_ATTACHED)); | |
908 | BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BLOCKED)); | |
bd3e7610 | 909 | BUG_ON(lockres->l_blocking <= DLM_LOCK_NL); |
ccd979bd MF |
910 | |
911 | lockres->l_level = lockres->l_requested; | |
912 | if (lockres->l_level <= | |
913 | ocfs2_highest_compat_lock_level(lockres->l_blocking)) { | |
bd3e7610 | 914 | lockres->l_blocking = DLM_LOCK_NL; |
ccd979bd MF |
915 | lockres_clear_flags(lockres, OCFS2_LOCK_BLOCKED); |
916 | } | |
917 | lockres_clear_flags(lockres, OCFS2_LOCK_BUSY); | |
ccd979bd MF |
918 | } |
919 | ||
920 | static inline void ocfs2_generic_handle_convert_action(struct ocfs2_lock_res *lockres) | |
921 | { | |
ccd979bd MF |
922 | BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BUSY)); |
923 | BUG_ON(!(lockres->l_flags & OCFS2_LOCK_ATTACHED)); | |
924 | ||
925 | /* Convert from RO to EX doesn't really need anything as our | |
926 | * information is already up to data. Convert from NL to | |
927 | * *anything* however should mark ourselves as needing an | |
928 | * update */ | |
bd3e7610 | 929 | if (lockres->l_level == DLM_LOCK_NL && |
f625c979 | 930 | lockres->l_ops->flags & LOCK_TYPE_REQUIRES_REFRESH) |
ccd979bd MF |
931 | lockres_or_flags(lockres, OCFS2_LOCK_NEEDS_REFRESH); |
932 | ||
933 | lockres->l_level = lockres->l_requested; | |
a1912826 SM |
934 | |
935 | /* | |
936 | * We set the OCFS2_LOCK_UPCONVERT_FINISHING flag before clearing | |
937 | * the OCFS2_LOCK_BUSY flag to prevent the dc thread from | |
938 | * downconverting the lock before the upconvert has fully completed. | |
d1e78238 X |
939 | * Do not prevent the dc thread from downconverting if NONBLOCK lock |
940 | * had already returned. | |
a1912826 | 941 | */ |
d1e78238 X |
942 | if (!(lockres->l_flags & OCFS2_LOCK_NONBLOCK_FINISHED)) |
943 | lockres_or_flags(lockres, OCFS2_LOCK_UPCONVERT_FINISHING); | |
944 | else | |
945 | lockres_clear_flags(lockres, OCFS2_LOCK_NONBLOCK_FINISHED); | |
a1912826 | 946 | |
ccd979bd | 947 | lockres_clear_flags(lockres, OCFS2_LOCK_BUSY); |
ccd979bd MF |
948 | } |
949 | ||
950 | static inline void ocfs2_generic_handle_attach_action(struct ocfs2_lock_res *lockres) | |
951 | { | |
3cf0c507 | 952 | BUG_ON((!(lockres->l_flags & OCFS2_LOCK_BUSY))); |
ccd979bd MF |
953 | BUG_ON(lockres->l_flags & OCFS2_LOCK_ATTACHED); |
954 | ||
bd3e7610 | 955 | if (lockres->l_requested > DLM_LOCK_NL && |
f625c979 MF |
956 | !(lockres->l_flags & OCFS2_LOCK_LOCAL) && |
957 | lockres->l_ops->flags & LOCK_TYPE_REQUIRES_REFRESH) | |
ccd979bd MF |
958 | lockres_or_flags(lockres, OCFS2_LOCK_NEEDS_REFRESH); |
959 | ||
960 | lockres->l_level = lockres->l_requested; | |
961 | lockres_or_flags(lockres, OCFS2_LOCK_ATTACHED); | |
962 | lockres_clear_flags(lockres, OCFS2_LOCK_BUSY); | |
ccd979bd MF |
963 | } |
964 | ||
ccd979bd MF |
965 | static int ocfs2_generic_handle_bast(struct ocfs2_lock_res *lockres, |
966 | int level) | |
967 | { | |
968 | int needs_downconvert = 0; | |
ccd979bd MF |
969 | |
970 | assert_spin_locked(&lockres->l_lock); | |
971 | ||
ccd979bd MF |
972 | if (level > lockres->l_blocking) { |
973 | /* only schedule a downconvert if we haven't already scheduled | |
974 | * one that goes low enough to satisfy the level we're | |
975 | * blocking. this also catches the case where we get | |
976 | * duplicate BASTs */ | |
977 | if (ocfs2_highest_compat_lock_level(level) < | |
978 | ocfs2_highest_compat_lock_level(lockres->l_blocking)) | |
979 | needs_downconvert = 1; | |
980 | ||
981 | lockres->l_blocking = level; | |
982 | } | |
983 | ||
9b915181 SM |
984 | mlog(ML_BASTS, "lockres %s, block %d, level %d, l_block %d, dwn %d\n", |
985 | lockres->l_name, level, lockres->l_level, lockres->l_blocking, | |
986 | needs_downconvert); | |
987 | ||
0b94a909 WW |
988 | if (needs_downconvert) |
989 | lockres_or_flags(lockres, OCFS2_LOCK_BLOCKED); | |
c1e8d35e | 990 | mlog(0, "needs_downconvert = %d\n", needs_downconvert); |
ccd979bd MF |
991 | return needs_downconvert; |
992 | } | |
993 | ||
de551246 JB |
994 | /* |
995 | * OCFS2_LOCK_PENDING and l_pending_gen. | |
996 | * | |
997 | * Why does OCFS2_LOCK_PENDING exist? To close a race between setting | |
998 | * OCFS2_LOCK_BUSY and calling ocfs2_dlm_lock(). See ocfs2_unblock_lock() | |
999 | * for more details on the race. | |
1000 | * | |
1001 | * OCFS2_LOCK_PENDING closes the race quite nicely. However, it introduces | |
1002 | * a race on itself. In o2dlm, we can get the ast before ocfs2_dlm_lock() | |
1003 | * returns. The ast clears OCFS2_LOCK_BUSY, and must therefore clear | |
1004 | * OCFS2_LOCK_PENDING at the same time. When ocfs2_dlm_lock() returns, | |
1005 | * the caller is going to try to clear PENDING again. If nothing else is | |
1006 | * happening, __lockres_clear_pending() sees PENDING is unset and does | |
1007 | * nothing. | |
1008 | * | |
1009 | * But what if another path (eg downconvert thread) has just started a | |
1010 | * new locking action? The other path has re-set PENDING. Our path | |
1011 | * cannot clear PENDING, because that will re-open the original race | |
1012 | * window. | |
1013 | * | |
1014 | * [Example] | |
1015 | * | |
1016 | * ocfs2_meta_lock() | |
1017 | * ocfs2_cluster_lock() | |
1018 | * set BUSY | |
1019 | * set PENDING | |
1020 | * drop l_lock | |
1021 | * ocfs2_dlm_lock() | |
1022 | * ocfs2_locking_ast() ocfs2_downconvert_thread() | |
1023 | * clear PENDING ocfs2_unblock_lock() | |
1024 | * take_l_lock | |
1025 | * !BUSY | |
1026 | * ocfs2_prepare_downconvert() | |
1027 | * set BUSY | |
1028 | * set PENDING | |
1029 | * drop l_lock | |
1030 | * take l_lock | |
1031 | * clear PENDING | |
1032 | * drop l_lock | |
1033 | * <window> | |
1034 | * ocfs2_dlm_lock() | |
1035 | * | |
1036 | * So as you can see, we now have a window where l_lock is not held, | |
1037 | * PENDING is not set, and ocfs2_dlm_lock() has not been called. | |
1038 | * | |
1039 | * The core problem is that ocfs2_cluster_lock() has cleared the PENDING | |
1040 | * set by ocfs2_prepare_downconvert(). That wasn't nice. | |
1041 | * | |
1042 | * To solve this we introduce l_pending_gen. A call to | |
1043 | * lockres_clear_pending() will only do so when it is passed a generation | |
1044 | * number that matches the lockres. lockres_set_pending() will return the | |
1045 | * current generation number. When ocfs2_cluster_lock() goes to clear | |
1046 | * PENDING, it passes the generation it got from set_pending(). In our | |
1047 | * example above, the generation numbers will *not* match. Thus, | |
1048 | * ocfs2_cluster_lock() will not clear the PENDING set by | |
1049 | * ocfs2_prepare_downconvert(). | |
1050 | */ | |
1051 | ||
1052 | /* Unlocked version for ocfs2_locking_ast() */ | |
1053 | static void __lockres_clear_pending(struct ocfs2_lock_res *lockres, | |
1054 | unsigned int generation, | |
1055 | struct ocfs2_super *osb) | |
1056 | { | |
1057 | assert_spin_locked(&lockres->l_lock); | |
1058 | ||
1059 | /* | |
1060 | * The ast and locking functions can race us here. The winner | |
1061 | * will clear pending, the loser will not. | |
1062 | */ | |
1063 | if (!(lockres->l_flags & OCFS2_LOCK_PENDING) || | |
1064 | (lockres->l_pending_gen != generation)) | |
1065 | return; | |
1066 | ||
1067 | lockres_clear_flags(lockres, OCFS2_LOCK_PENDING); | |
1068 | lockres->l_pending_gen++; | |
1069 | ||
1070 | /* | |
1071 | * The downconvert thread may have skipped us because we | |
1072 | * were PENDING. Wake it up. | |
1073 | */ | |
1074 | if (lockres->l_flags & OCFS2_LOCK_BLOCKED) | |
1075 | ocfs2_wake_downconvert_thread(osb); | |
1076 | } | |
1077 | ||
1078 | /* Locked version for callers of ocfs2_dlm_lock() */ | |
1079 | static void lockres_clear_pending(struct ocfs2_lock_res *lockres, | |
1080 | unsigned int generation, | |
1081 | struct ocfs2_super *osb) | |
1082 | { | |
1083 | unsigned long flags; | |
1084 | ||
1085 | spin_lock_irqsave(&lockres->l_lock, flags); | |
1086 | __lockres_clear_pending(lockres, generation, osb); | |
1087 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
1088 | } | |
1089 | ||
1090 | static unsigned int lockres_set_pending(struct ocfs2_lock_res *lockres) | |
1091 | { | |
1092 | assert_spin_locked(&lockres->l_lock); | |
1093 | BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BUSY)); | |
1094 | ||
1095 | lockres_or_flags(lockres, OCFS2_LOCK_PENDING); | |
1096 | ||
1097 | return lockres->l_pending_gen; | |
1098 | } | |
1099 | ||
c0e41338 | 1100 | static void ocfs2_blocking_ast(struct ocfs2_dlm_lksb *lksb, int level) |
ccd979bd | 1101 | { |
a796d286 | 1102 | struct ocfs2_lock_res *lockres = ocfs2_lksb_to_lock_res(lksb); |
aa2623ad | 1103 | struct ocfs2_super *osb = ocfs2_get_lockres_osb(lockres); |
ccd979bd MF |
1104 | int needs_downconvert; |
1105 | unsigned long flags; | |
1106 | ||
bd3e7610 | 1107 | BUG_ON(level <= DLM_LOCK_NL); |
ccd979bd | 1108 | |
9b915181 SM |
1109 | mlog(ML_BASTS, "BAST fired for lockres %s, blocking %d, level %d, " |
1110 | "type %s\n", lockres->l_name, level, lockres->l_level, | |
aa2623ad MF |
1111 | ocfs2_lock_type_string(lockres->l_type)); |
1112 | ||
cf8e06f1 MF |
1113 | /* |
1114 | * We can skip the bast for locks which don't enable caching - | |
1115 | * they'll be dropped at the earliest possible time anyway. | |
1116 | */ | |
1117 | if (lockres->l_flags & OCFS2_LOCK_NOCACHE) | |
1118 | return; | |
1119 | ||
ccd979bd MF |
1120 | spin_lock_irqsave(&lockres->l_lock, flags); |
1121 | needs_downconvert = ocfs2_generic_handle_bast(lockres, level); | |
1122 | if (needs_downconvert) | |
1123 | ocfs2_schedule_blocked_lock(osb, lockres); | |
1124 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
1125 | ||
d680efe9 MF |
1126 | wake_up(&lockres->l_event); |
1127 | ||
34d024f8 | 1128 | ocfs2_wake_downconvert_thread(osb); |
ccd979bd MF |
1129 | } |
1130 | ||
c0e41338 | 1131 | static void ocfs2_locking_ast(struct ocfs2_dlm_lksb *lksb) |
ccd979bd | 1132 | { |
a796d286 | 1133 | struct ocfs2_lock_res *lockres = ocfs2_lksb_to_lock_res(lksb); |
de551246 | 1134 | struct ocfs2_super *osb = ocfs2_get_lockres_osb(lockres); |
ccd979bd | 1135 | unsigned long flags; |
1693a5c0 | 1136 | int status; |
ccd979bd MF |
1137 | |
1138 | spin_lock_irqsave(&lockres->l_lock, flags); | |
1139 | ||
1693a5c0 DT |
1140 | status = ocfs2_dlm_lock_status(&lockres->l_lksb); |
1141 | ||
1142 | if (status == -EAGAIN) { | |
1143 | lockres_clear_flags(lockres, OCFS2_LOCK_BUSY); | |
1144 | goto out; | |
1145 | } | |
1146 | ||
1147 | if (status) { | |
8f2c9c1b | 1148 | mlog(ML_ERROR, "lockres %s: lksb status value of %d!\n", |
1693a5c0 | 1149 | lockres->l_name, status); |
ccd979bd MF |
1150 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
1151 | return; | |
1152 | } | |
1153 | ||
9b915181 SM |
1154 | mlog(ML_BASTS, "AST fired for lockres %s, action %d, unlock %d, " |
1155 | "level %d => %d\n", lockres->l_name, lockres->l_action, | |
1156 | lockres->l_unlock_action, lockres->l_level, lockres->l_requested); | |
1157 | ||
ccd979bd MF |
1158 | switch(lockres->l_action) { |
1159 | case OCFS2_AST_ATTACH: | |
1160 | ocfs2_generic_handle_attach_action(lockres); | |
e92d57df | 1161 | lockres_clear_flags(lockres, OCFS2_LOCK_LOCAL); |
ccd979bd MF |
1162 | break; |
1163 | case OCFS2_AST_CONVERT: | |
1164 | ocfs2_generic_handle_convert_action(lockres); | |
1165 | break; | |
1166 | case OCFS2_AST_DOWNCONVERT: | |
1167 | ocfs2_generic_handle_downconvert_action(lockres); | |
1168 | break; | |
1169 | default: | |
9b915181 SM |
1170 | mlog(ML_ERROR, "lockres %s: AST fired with invalid action: %u, " |
1171 | "flags 0x%lx, unlock: %u\n", | |
e92d57df MF |
1172 | lockres->l_name, lockres->l_action, lockres->l_flags, |
1173 | lockres->l_unlock_action); | |
ccd979bd MF |
1174 | BUG(); |
1175 | } | |
1693a5c0 | 1176 | out: |
ccd979bd MF |
1177 | /* set it to something invalid so if we get called again we |
1178 | * can catch it. */ | |
1179 | lockres->l_action = OCFS2_AST_INVALID; | |
ccd979bd | 1180 | |
de551246 JB |
1181 | /* Did we try to cancel this lock? Clear that state */ |
1182 | if (lockres->l_unlock_action == OCFS2_UNLOCK_CANCEL_CONVERT) | |
1183 | lockres->l_unlock_action = OCFS2_UNLOCK_INVALID; | |
1184 | ||
1185 | /* | |
1186 | * We may have beaten the locking functions here. We certainly | |
1187 | * know that dlm_lock() has been called :-) | |
1188 | * Because we can't have two lock calls in flight at once, we | |
1189 | * can use lockres->l_pending_gen. | |
1190 | */ | |
1191 | __lockres_clear_pending(lockres, lockres->l_pending_gen, osb); | |
1192 | ||
ccd979bd | 1193 | wake_up(&lockres->l_event); |
d680efe9 | 1194 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
ccd979bd MF |
1195 | } |
1196 | ||
553b5eb9 JB |
1197 | static void ocfs2_unlock_ast(struct ocfs2_dlm_lksb *lksb, int error) |
1198 | { | |
1199 | struct ocfs2_lock_res *lockres = ocfs2_lksb_to_lock_res(lksb); | |
1200 | unsigned long flags; | |
1201 | ||
9b915181 SM |
1202 | mlog(ML_BASTS, "UNLOCK AST fired for lockres %s, action = %d\n", |
1203 | lockres->l_name, lockres->l_unlock_action); | |
553b5eb9 JB |
1204 | |
1205 | spin_lock_irqsave(&lockres->l_lock, flags); | |
1206 | if (error) { | |
1207 | mlog(ML_ERROR, "Dlm passes error %d for lock %s, " | |
1208 | "unlock_action %d\n", error, lockres->l_name, | |
1209 | lockres->l_unlock_action); | |
1210 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
553b5eb9 JB |
1211 | return; |
1212 | } | |
1213 | ||
1214 | switch(lockres->l_unlock_action) { | |
1215 | case OCFS2_UNLOCK_CANCEL_CONVERT: | |
1216 | mlog(0, "Cancel convert success for %s\n", lockres->l_name); | |
1217 | lockres->l_action = OCFS2_AST_INVALID; | |
1218 | /* Downconvert thread may have requeued this lock, we | |
1219 | * need to wake it. */ | |
1220 | if (lockres->l_flags & OCFS2_LOCK_BLOCKED) | |
1221 | ocfs2_wake_downconvert_thread(ocfs2_get_lockres_osb(lockres)); | |
1222 | break; | |
1223 | case OCFS2_UNLOCK_DROP_LOCK: | |
1224 | lockres->l_level = DLM_LOCK_IV; | |
1225 | break; | |
1226 | default: | |
1227 | BUG(); | |
1228 | } | |
1229 | ||
1230 | lockres_clear_flags(lockres, OCFS2_LOCK_BUSY); | |
1231 | lockres->l_unlock_action = OCFS2_UNLOCK_INVALID; | |
1232 | wake_up(&lockres->l_event); | |
1233 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
553b5eb9 JB |
1234 | } |
1235 | ||
1236 | /* | |
1237 | * This is the filesystem locking protocol. It provides the lock handling | |
1238 | * hooks for the underlying DLM. It has a maximum version number. | |
1239 | * The version number allows interoperability with systems running at | |
1240 | * the same major number and an equal or smaller minor number. | |
1241 | * | |
1242 | * Whenever the filesystem does new things with locks (adds or removes a | |
1243 | * lock, orders them differently, does different things underneath a lock), | |
1244 | * the version must be changed. The protocol is negotiated when joining | |
1245 | * the dlm domain. A node may join the domain if its major version is | |
1246 | * identical to all other nodes and its minor version is greater than | |
1247 | * or equal to all other nodes. When its minor version is greater than | |
1248 | * the other nodes, it will run at the minor version specified by the | |
1249 | * other nodes. | |
1250 | * | |
1251 | * If a locking change is made that will not be compatible with older | |
1252 | * versions, the major number must be increased and the minor version set | |
1253 | * to zero. If a change merely adds a behavior that can be disabled when | |
1254 | * speaking to older versions, the minor version must be increased. If a | |
1255 | * change adds a fully backwards compatible change (eg, LVB changes that | |
1256 | * are just ignored by older versions), the version does not need to be | |
1257 | * updated. | |
1258 | */ | |
1259 | static struct ocfs2_locking_protocol lproto = { | |
1260 | .lp_max_version = { | |
1261 | .pv_major = OCFS2_LOCKING_PROTOCOL_MAJOR, | |
1262 | .pv_minor = OCFS2_LOCKING_PROTOCOL_MINOR, | |
1263 | }, | |
1264 | .lp_lock_ast = ocfs2_locking_ast, | |
1265 | .lp_blocking_ast = ocfs2_blocking_ast, | |
1266 | .lp_unlock_ast = ocfs2_unlock_ast, | |
1267 | }; | |
1268 | ||
1269 | void ocfs2_set_locking_protocol(void) | |
1270 | { | |
1271 | ocfs2_stack_glue_set_max_proto_version(&lproto.lp_max_version); | |
1272 | } | |
1273 | ||
ccd979bd MF |
1274 | static inline void ocfs2_recover_from_dlm_error(struct ocfs2_lock_res *lockres, |
1275 | int convert) | |
1276 | { | |
1277 | unsigned long flags; | |
1278 | ||
ccd979bd MF |
1279 | spin_lock_irqsave(&lockres->l_lock, flags); |
1280 | lockres_clear_flags(lockres, OCFS2_LOCK_BUSY); | |
a1912826 | 1281 | lockres_clear_flags(lockres, OCFS2_LOCK_UPCONVERT_FINISHING); |
ccd979bd MF |
1282 | if (convert) |
1283 | lockres->l_action = OCFS2_AST_INVALID; | |
1284 | else | |
1285 | lockres->l_unlock_action = OCFS2_UNLOCK_INVALID; | |
1286 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
1287 | ||
1288 | wake_up(&lockres->l_event); | |
ccd979bd MF |
1289 | } |
1290 | ||
1291 | /* Note: If we detect another process working on the lock (i.e., | |
1292 | * OCFS2_LOCK_BUSY), we'll bail out returning 0. It's up to the caller | |
1293 | * to do the right thing in that case. | |
1294 | */ | |
1295 | static int ocfs2_lock_create(struct ocfs2_super *osb, | |
1296 | struct ocfs2_lock_res *lockres, | |
1297 | int level, | |
bd3e7610 | 1298 | u32 dlm_flags) |
ccd979bd MF |
1299 | { |
1300 | int ret = 0; | |
ccd979bd | 1301 | unsigned long flags; |
de551246 | 1302 | unsigned int gen; |
ccd979bd | 1303 | |
bd3e7610 | 1304 | mlog(0, "lock %s, level = %d, flags = %u\n", lockres->l_name, level, |
ccd979bd MF |
1305 | dlm_flags); |
1306 | ||
1307 | spin_lock_irqsave(&lockres->l_lock, flags); | |
1308 | if ((lockres->l_flags & OCFS2_LOCK_ATTACHED) || | |
1309 | (lockres->l_flags & OCFS2_LOCK_BUSY)) { | |
1310 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
1311 | goto bail; | |
1312 | } | |
1313 | ||
1314 | lockres->l_action = OCFS2_AST_ATTACH; | |
1315 | lockres->l_requested = level; | |
1316 | lockres_or_flags(lockres, OCFS2_LOCK_BUSY); | |
de551246 | 1317 | gen = lockres_set_pending(lockres); |
ccd979bd MF |
1318 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
1319 | ||
4670c46d | 1320 | ret = ocfs2_dlm_lock(osb->cconn, |
7431cd7e JB |
1321 | level, |
1322 | &lockres->l_lksb, | |
1323 | dlm_flags, | |
1324 | lockres->l_name, | |
a796d286 | 1325 | OCFS2_LOCK_ID_MAX_LEN - 1); |
de551246 | 1326 | lockres_clear_pending(lockres, gen, osb); |
7431cd7e JB |
1327 | if (ret) { |
1328 | ocfs2_log_dlm_error("ocfs2_dlm_lock", ret, lockres); | |
ccd979bd MF |
1329 | ocfs2_recover_from_dlm_error(lockres, 1); |
1330 | } | |
1331 | ||
7431cd7e | 1332 | mlog(0, "lock %s, return from ocfs2_dlm_lock\n", lockres->l_name); |
ccd979bd MF |
1333 | |
1334 | bail: | |
ccd979bd MF |
1335 | return ret; |
1336 | } | |
1337 | ||
1338 | static inline int ocfs2_check_wait_flag(struct ocfs2_lock_res *lockres, | |
1339 | int flag) | |
1340 | { | |
1341 | unsigned long flags; | |
1342 | int ret; | |
1343 | ||
1344 | spin_lock_irqsave(&lockres->l_lock, flags); | |
1345 | ret = lockres->l_flags & flag; | |
1346 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
1347 | ||
1348 | return ret; | |
1349 | } | |
1350 | ||
1351 | static inline void ocfs2_wait_on_busy_lock(struct ocfs2_lock_res *lockres) | |
1352 | ||
1353 | { | |
1354 | wait_event(lockres->l_event, | |
1355 | !ocfs2_check_wait_flag(lockres, OCFS2_LOCK_BUSY)); | |
1356 | } | |
1357 | ||
1358 | static inline void ocfs2_wait_on_refreshing_lock(struct ocfs2_lock_res *lockres) | |
1359 | ||
1360 | { | |
1361 | wait_event(lockres->l_event, | |
1362 | !ocfs2_check_wait_flag(lockres, OCFS2_LOCK_REFRESHING)); | |
1363 | } | |
1364 | ||
1365 | /* predict what lock level we'll be dropping down to on behalf | |
1366 | * of another node, and return true if the currently wanted | |
1367 | * level will be compatible with it. */ | |
1368 | static inline int ocfs2_may_continue_on_blocked_lock(struct ocfs2_lock_res *lockres, | |
1369 | int wanted) | |
1370 | { | |
1371 | BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BLOCKED)); | |
1372 | ||
1373 | return wanted <= ocfs2_highest_compat_lock_level(lockres->l_blocking); | |
1374 | } | |
1375 | ||
1376 | static void ocfs2_init_mask_waiter(struct ocfs2_mask_waiter *mw) | |
1377 | { | |
1378 | INIT_LIST_HEAD(&mw->mw_item); | |
1379 | init_completion(&mw->mw_complete); | |
8ddb7b00 | 1380 | ocfs2_init_start_time(mw); |
ccd979bd MF |
1381 | } |
1382 | ||
1383 | static int ocfs2_wait_for_mask(struct ocfs2_mask_waiter *mw) | |
1384 | { | |
1385 | wait_for_completion(&mw->mw_complete); | |
1386 | /* Re-arm the completion in case we want to wait on it again */ | |
16735d02 | 1387 | reinit_completion(&mw->mw_complete); |
ccd979bd MF |
1388 | return mw->mw_status; |
1389 | } | |
1390 | ||
1391 | static void lockres_add_mask_waiter(struct ocfs2_lock_res *lockres, | |
1392 | struct ocfs2_mask_waiter *mw, | |
1393 | unsigned long mask, | |
1394 | unsigned long goal) | |
1395 | { | |
1396 | BUG_ON(!list_empty(&mw->mw_item)); | |
1397 | ||
1398 | assert_spin_locked(&lockres->l_lock); | |
1399 | ||
1400 | list_add_tail(&mw->mw_item, &lockres->l_mask_waiters); | |
1401 | mw->mw_mask = mask; | |
1402 | mw->mw_goal = goal; | |
1403 | } | |
1404 | ||
1405 | /* returns 0 if the mw that was removed was already satisfied, -EBUSY | |
1406 | * if the mask still hadn't reached its goal */ | |
d1e78238 | 1407 | static int __lockres_remove_mask_waiter(struct ocfs2_lock_res *lockres, |
ccd979bd MF |
1408 | struct ocfs2_mask_waiter *mw) |
1409 | { | |
ccd979bd MF |
1410 | int ret = 0; |
1411 | ||
d1e78238 | 1412 | assert_spin_locked(&lockres->l_lock); |
ccd979bd MF |
1413 | if (!list_empty(&mw->mw_item)) { |
1414 | if ((lockres->l_flags & mw->mw_mask) != mw->mw_goal) | |
1415 | ret = -EBUSY; | |
1416 | ||
1417 | list_del_init(&mw->mw_item); | |
1418 | init_completion(&mw->mw_complete); | |
1419 | } | |
d1e78238 X |
1420 | |
1421 | return ret; | |
1422 | } | |
1423 | ||
1424 | static int lockres_remove_mask_waiter(struct ocfs2_lock_res *lockres, | |
1425 | struct ocfs2_mask_waiter *mw) | |
1426 | { | |
1427 | unsigned long flags; | |
1428 | int ret = 0; | |
1429 | ||
1430 | spin_lock_irqsave(&lockres->l_lock, flags); | |
1431 | ret = __lockres_remove_mask_waiter(lockres, mw); | |
ccd979bd MF |
1432 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
1433 | ||
1434 | return ret; | |
1435 | ||
1436 | } | |
1437 | ||
cf8e06f1 MF |
1438 | static int ocfs2_wait_for_mask_interruptible(struct ocfs2_mask_waiter *mw, |
1439 | struct ocfs2_lock_res *lockres) | |
1440 | { | |
1441 | int ret; | |
1442 | ||
1443 | ret = wait_for_completion_interruptible(&mw->mw_complete); | |
1444 | if (ret) | |
1445 | lockres_remove_mask_waiter(lockres, mw); | |
1446 | else | |
1447 | ret = mw->mw_status; | |
1448 | /* Re-arm the completion in case we want to wait on it again */ | |
16735d02 | 1449 | reinit_completion(&mw->mw_complete); |
cf8e06f1 MF |
1450 | return ret; |
1451 | } | |
1452 | ||
cb25797d JK |
1453 | static int __ocfs2_cluster_lock(struct ocfs2_super *osb, |
1454 | struct ocfs2_lock_res *lockres, | |
1455 | int level, | |
1456 | u32 lkm_flags, | |
1457 | int arg_flags, | |
1458 | int l_subclass, | |
1459 | unsigned long caller_ip) | |
ccd979bd MF |
1460 | { |
1461 | struct ocfs2_mask_waiter mw; | |
ccd979bd MF |
1462 | int wait, catch_signals = !(osb->s_mount_opt & OCFS2_MOUNT_NOINTR); |
1463 | int ret = 0; /* gcc doesn't realize wait = 1 guarantees ret is set */ | |
1464 | unsigned long flags; | |
de551246 | 1465 | unsigned int gen; |
1693a5c0 | 1466 | int noqueue_attempted = 0; |
d1e78238 | 1467 | int dlm_locked = 0; |
b1b1e15e | 1468 | int kick_dc = 0; |
ccd979bd | 1469 | |
2f2eca20 | 1470 | if (!(lockres->l_flags & OCFS2_LOCK_INITIALIZED)) { |
1471 | mlog_errno(-EINVAL); | |
1472 | return -EINVAL; | |
1473 | } | |
1474 | ||
ccd979bd MF |
1475 | ocfs2_init_mask_waiter(&mw); |
1476 | ||
b80fc012 | 1477 | if (lockres->l_ops->flags & LOCK_TYPE_USES_LVB) |
bd3e7610 | 1478 | lkm_flags |= DLM_LKF_VALBLK; |
b80fc012 | 1479 | |
ccd979bd MF |
1480 | again: |
1481 | wait = 0; | |
1482 | ||
a1912826 SM |
1483 | spin_lock_irqsave(&lockres->l_lock, flags); |
1484 | ||
ccd979bd MF |
1485 | if (catch_signals && signal_pending(current)) { |
1486 | ret = -ERESTARTSYS; | |
a1912826 | 1487 | goto unlock; |
ccd979bd MF |
1488 | } |
1489 | ||
ccd979bd MF |
1490 | mlog_bug_on_msg(lockres->l_flags & OCFS2_LOCK_FREEING, |
1491 | "Cluster lock called on freeing lockres %s! flags " | |
1492 | "0x%lx\n", lockres->l_name, lockres->l_flags); | |
1493 | ||
1494 | /* We only compare against the currently granted level | |
1495 | * here. If the lock is blocked waiting on a downconvert, | |
1496 | * we'll get caught below. */ | |
1497 | if (lockres->l_flags & OCFS2_LOCK_BUSY && | |
1498 | level > lockres->l_level) { | |
1499 | /* is someone sitting in dlm_lock? If so, wait on | |
1500 | * them. */ | |
1501 | lockres_add_mask_waiter(lockres, &mw, OCFS2_LOCK_BUSY, 0); | |
1502 | wait = 1; | |
1503 | goto unlock; | |
1504 | } | |
1505 | ||
a1912826 SM |
1506 | if (lockres->l_flags & OCFS2_LOCK_UPCONVERT_FINISHING) { |
1507 | /* | |
1508 | * We've upconverted. If the lock now has a level we can | |
1509 | * work with, we take it. If, however, the lock is not at the | |
1510 | * required level, we go thru the full cycle. One way this could | |
1511 | * happen is if a process requesting an upconvert to PR is | |
1512 | * closely followed by another requesting upconvert to an EX. | |
1513 | * If the process requesting EX lands here, we want it to | |
1514 | * continue attempting to upconvert and let the process | |
1515 | * requesting PR take the lock. | |
1516 | * If multiple processes request upconvert to PR, the first one | |
1517 | * here will take the lock. The others will have to go thru the | |
1518 | * OCFS2_LOCK_BLOCKED check to ensure that there is no pending | |
1519 | * downconvert request. | |
1520 | */ | |
1521 | if (level <= lockres->l_level) | |
1522 | goto update_holders; | |
1523 | } | |
1524 | ||
ccd979bd MF |
1525 | if (lockres->l_flags & OCFS2_LOCK_BLOCKED && |
1526 | !ocfs2_may_continue_on_blocked_lock(lockres, level)) { | |
1527 | /* is the lock is currently blocked on behalf of | |
1528 | * another node */ | |
1529 | lockres_add_mask_waiter(lockres, &mw, OCFS2_LOCK_BLOCKED, 0); | |
1530 | wait = 1; | |
1531 | goto unlock; | |
1532 | } | |
1533 | ||
1534 | if (level > lockres->l_level) { | |
1693a5c0 DT |
1535 | if (noqueue_attempted > 0) { |
1536 | ret = -EAGAIN; | |
1537 | goto unlock; | |
1538 | } | |
1539 | if (lkm_flags & DLM_LKF_NOQUEUE) | |
1540 | noqueue_attempted = 1; | |
1541 | ||
ccd979bd MF |
1542 | if (lockres->l_action != OCFS2_AST_INVALID) |
1543 | mlog(ML_ERROR, "lockres %s has action %u pending\n", | |
1544 | lockres->l_name, lockres->l_action); | |
1545 | ||
019d1b22 MF |
1546 | if (!(lockres->l_flags & OCFS2_LOCK_ATTACHED)) { |
1547 | lockres->l_action = OCFS2_AST_ATTACH; | |
bd3e7610 | 1548 | lkm_flags &= ~DLM_LKF_CONVERT; |
019d1b22 MF |
1549 | } else { |
1550 | lockres->l_action = OCFS2_AST_CONVERT; | |
bd3e7610 | 1551 | lkm_flags |= DLM_LKF_CONVERT; |
019d1b22 MF |
1552 | } |
1553 | ||
ccd979bd MF |
1554 | lockres->l_requested = level; |
1555 | lockres_or_flags(lockres, OCFS2_LOCK_BUSY); | |
de551246 | 1556 | gen = lockres_set_pending(lockres); |
ccd979bd MF |
1557 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
1558 | ||
bd3e7610 JB |
1559 | BUG_ON(level == DLM_LOCK_IV); |
1560 | BUG_ON(level == DLM_LOCK_NL); | |
ccd979bd | 1561 | |
9b915181 | 1562 | mlog(ML_BASTS, "lockres %s, convert from %d to %d\n", |
ccd979bd MF |
1563 | lockres->l_name, lockres->l_level, level); |
1564 | ||
1565 | /* call dlm_lock to upgrade lock now */ | |
4670c46d | 1566 | ret = ocfs2_dlm_lock(osb->cconn, |
7431cd7e JB |
1567 | level, |
1568 | &lockres->l_lksb, | |
1569 | lkm_flags, | |
1570 | lockres->l_name, | |
a796d286 | 1571 | OCFS2_LOCK_ID_MAX_LEN - 1); |
de551246 | 1572 | lockres_clear_pending(lockres, gen, osb); |
7431cd7e JB |
1573 | if (ret) { |
1574 | if (!(lkm_flags & DLM_LKF_NOQUEUE) || | |
1575 | (ret != -EAGAIN)) { | |
24ef1815 | 1576 | ocfs2_log_dlm_error("ocfs2_dlm_lock", |
7431cd7e | 1577 | ret, lockres); |
ccd979bd MF |
1578 | } |
1579 | ocfs2_recover_from_dlm_error(lockres, 1); | |
1580 | goto out; | |
1581 | } | |
d1e78238 | 1582 | dlm_locked = 1; |
ccd979bd | 1583 | |
73ac36ea | 1584 | mlog(0, "lock %s, successful return from ocfs2_dlm_lock\n", |
ccd979bd MF |
1585 | lockres->l_name); |
1586 | ||
1587 | /* At this point we've gone inside the dlm and need to | |
1588 | * complete our work regardless. */ | |
1589 | catch_signals = 0; | |
1590 | ||
1591 | /* wait for busy to clear and carry on */ | |
1592 | goto again; | |
1593 | } | |
1594 | ||
a1912826 | 1595 | update_holders: |
ccd979bd MF |
1596 | /* Ok, if we get here then we're good to go. */ |
1597 | ocfs2_inc_holders(lockres, level); | |
1598 | ||
1599 | ret = 0; | |
1600 | unlock: | |
a1912826 SM |
1601 | lockres_clear_flags(lockres, OCFS2_LOCK_UPCONVERT_FINISHING); |
1602 | ||
b1b1e15e TS |
1603 | /* ocfs2_unblock_lock reques on seeing OCFS2_LOCK_UPCONVERT_FINISHING */ |
1604 | kick_dc = (lockres->l_flags & OCFS2_LOCK_BLOCKED); | |
1605 | ||
ccd979bd | 1606 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
b1b1e15e TS |
1607 | if (kick_dc) |
1608 | ocfs2_wake_downconvert_thread(osb); | |
ccd979bd MF |
1609 | out: |
1610 | /* | |
1611 | * This is helping work around a lock inversion between the page lock | |
1612 | * and dlm locks. One path holds the page lock while calling aops | |
1613 | * which block acquiring dlm locks. The voting thread holds dlm | |
1614 | * locks while acquiring page locks while down converting data locks. | |
1615 | * This block is helping an aop path notice the inversion and back | |
1616 | * off to unlock its page lock before trying the dlm lock again. | |
1617 | */ | |
1618 | if (wait && arg_flags & OCFS2_LOCK_NONBLOCK && | |
1619 | mw.mw_mask & (OCFS2_LOCK_BUSY|OCFS2_LOCK_BLOCKED)) { | |
1620 | wait = 0; | |
d1e78238 X |
1621 | spin_lock_irqsave(&lockres->l_lock, flags); |
1622 | if (__lockres_remove_mask_waiter(lockres, &mw)) { | |
1623 | if (dlm_locked) | |
1624 | lockres_or_flags(lockres, | |
1625 | OCFS2_LOCK_NONBLOCK_FINISHED); | |
1626 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
ccd979bd | 1627 | ret = -EAGAIN; |
d1e78238 X |
1628 | } else { |
1629 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
ccd979bd | 1630 | goto again; |
d1e78238 | 1631 | } |
ccd979bd MF |
1632 | } |
1633 | if (wait) { | |
1634 | ret = ocfs2_wait_for_mask(&mw); | |
1635 | if (ret == 0) | |
1636 | goto again; | |
1637 | mlog_errno(ret); | |
1638 | } | |
8ddb7b00 | 1639 | ocfs2_update_lock_stats(lockres, level, &mw, ret); |
ccd979bd | 1640 | |
cb25797d JK |
1641 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
1642 | if (!ret && lockres->l_lockdep_map.key != NULL) { | |
1643 | if (level == DLM_LOCK_PR) | |
1644 | rwsem_acquire_read(&lockres->l_lockdep_map, l_subclass, | |
1645 | !!(arg_flags & OCFS2_META_LOCK_NOQUEUE), | |
1646 | caller_ip); | |
1647 | else | |
1648 | rwsem_acquire(&lockres->l_lockdep_map, l_subclass, | |
1649 | !!(arg_flags & OCFS2_META_LOCK_NOQUEUE), | |
1650 | caller_ip); | |
1651 | } | |
1652 | #endif | |
ccd979bd MF |
1653 | return ret; |
1654 | } | |
1655 | ||
cb25797d JK |
1656 | static inline int ocfs2_cluster_lock(struct ocfs2_super *osb, |
1657 | struct ocfs2_lock_res *lockres, | |
1658 | int level, | |
1659 | u32 lkm_flags, | |
1660 | int arg_flags) | |
1661 | { | |
1662 | return __ocfs2_cluster_lock(osb, lockres, level, lkm_flags, arg_flags, | |
1663 | 0, _RET_IP_); | |
1664 | } | |
1665 | ||
1666 | ||
1667 | static void __ocfs2_cluster_unlock(struct ocfs2_super *osb, | |
1668 | struct ocfs2_lock_res *lockres, | |
1669 | int level, | |
1670 | unsigned long caller_ip) | |
ccd979bd MF |
1671 | { |
1672 | unsigned long flags; | |
1673 | ||
ccd979bd MF |
1674 | spin_lock_irqsave(&lockres->l_lock, flags); |
1675 | ocfs2_dec_holders(lockres, level); | |
34d024f8 | 1676 | ocfs2_downconvert_on_unlock(osb, lockres); |
ccd979bd | 1677 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
cb25797d JK |
1678 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
1679 | if (lockres->l_lockdep_map.key != NULL) | |
1680 | rwsem_release(&lockres->l_lockdep_map, 1, caller_ip); | |
1681 | #endif | |
ccd979bd MF |
1682 | } |
1683 | ||
da66116e AB |
1684 | static int ocfs2_create_new_lock(struct ocfs2_super *osb, |
1685 | struct ocfs2_lock_res *lockres, | |
1686 | int ex, | |
1687 | int local) | |
ccd979bd | 1688 | { |
bd3e7610 | 1689 | int level = ex ? DLM_LOCK_EX : DLM_LOCK_PR; |
ccd979bd | 1690 | unsigned long flags; |
bd3e7610 | 1691 | u32 lkm_flags = local ? DLM_LKF_LOCAL : 0; |
ccd979bd MF |
1692 | |
1693 | spin_lock_irqsave(&lockres->l_lock, flags); | |
1694 | BUG_ON(lockres->l_flags & OCFS2_LOCK_ATTACHED); | |
1695 | lockres_or_flags(lockres, OCFS2_LOCK_LOCAL); | |
1696 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
1697 | ||
24c19ef4 | 1698 | return ocfs2_lock_create(osb, lockres, level, lkm_flags); |
ccd979bd MF |
1699 | } |
1700 | ||
1701 | /* Grants us an EX lock on the data and metadata resources, skipping | |
1702 | * the normal cluster directory lookup. Use this ONLY on newly created | |
1703 | * inodes which other nodes can't possibly see, and which haven't been | |
1704 | * hashed in the inode hash yet. This can give us a good performance | |
1705 | * increase as it'll skip the network broadcast normally associated | |
1706 | * with creating a new lock resource. */ | |
1707 | int ocfs2_create_new_inode_locks(struct inode *inode) | |
1708 | { | |
1709 | int ret; | |
d680efe9 | 1710 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
ccd979bd | 1711 | |
ccd979bd MF |
1712 | BUG_ON(!ocfs2_inode_is_new(inode)); |
1713 | ||
b0697053 | 1714 | mlog(0, "Inode %llu\n", (unsigned long long)OCFS2_I(inode)->ip_blkno); |
ccd979bd MF |
1715 | |
1716 | /* NOTE: That we don't increment any of the holder counts, nor | |
1717 | * do we add anything to a journal handle. Since this is | |
1718 | * supposed to be a new inode which the cluster doesn't know | |
1719 | * about yet, there is no need to. As far as the LVB handling | |
1720 | * is concerned, this is basically like acquiring an EX lock | |
1721 | * on a resource which has an invalid one -- we'll set it | |
1722 | * valid when we release the EX. */ | |
1723 | ||
24c19ef4 | 1724 | ret = ocfs2_create_new_lock(osb, &OCFS2_I(inode)->ip_rw_lockres, 1, 1); |
ccd979bd MF |
1725 | if (ret) { |
1726 | mlog_errno(ret); | |
1727 | goto bail; | |
1728 | } | |
1729 | ||
24c19ef4 | 1730 | /* |
bd3e7610 | 1731 | * We don't want to use DLM_LKF_LOCAL on a meta data lock as they |
24c19ef4 MF |
1732 | * don't use a generation in their lock names. |
1733 | */ | |
e63aecb6 | 1734 | ret = ocfs2_create_new_lock(osb, &OCFS2_I(inode)->ip_inode_lockres, 1, 0); |
ccd979bd MF |
1735 | if (ret) { |
1736 | mlog_errno(ret); | |
1737 | goto bail; | |
1738 | } | |
1739 | ||
50008630 | 1740 | ret = ocfs2_create_new_lock(osb, &OCFS2_I(inode)->ip_open_lockres, 0, 0); |
a8f24f1b | 1741 | if (ret) |
50008630 | 1742 | mlog_errno(ret); |
50008630 | 1743 | |
ccd979bd | 1744 | bail: |
ccd979bd MF |
1745 | return ret; |
1746 | } | |
1747 | ||
1748 | int ocfs2_rw_lock(struct inode *inode, int write) | |
1749 | { | |
1750 | int status, level; | |
1751 | struct ocfs2_lock_res *lockres; | |
c271c5c2 | 1752 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
ccd979bd | 1753 | |
b0697053 MF |
1754 | mlog(0, "inode %llu take %s RW lock\n", |
1755 | (unsigned long long)OCFS2_I(inode)->ip_blkno, | |
ccd979bd MF |
1756 | write ? "EXMODE" : "PRMODE"); |
1757 | ||
c1e8d35e | 1758 | if (ocfs2_mount_local(osb)) |
c271c5c2 SM |
1759 | return 0; |
1760 | ||
ccd979bd MF |
1761 | lockres = &OCFS2_I(inode)->ip_rw_lockres; |
1762 | ||
bd3e7610 | 1763 | level = write ? DLM_LOCK_EX : DLM_LOCK_PR; |
ccd979bd | 1764 | |
1119d3c0 | 1765 | status = ocfs2_cluster_lock(osb, lockres, level, 0, 0); |
ccd979bd MF |
1766 | if (status < 0) |
1767 | mlog_errno(status); | |
1768 | ||
ccd979bd MF |
1769 | return status; |
1770 | } | |
1771 | ||
06e7f13d GH |
1772 | int ocfs2_try_rw_lock(struct inode *inode, int write) |
1773 | { | |
1774 | int status, level; | |
1775 | struct ocfs2_lock_res *lockres; | |
1776 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
1777 | ||
1778 | mlog(0, "inode %llu try to take %s RW lock\n", | |
1779 | (unsigned long long)OCFS2_I(inode)->ip_blkno, | |
1780 | write ? "EXMODE" : "PRMODE"); | |
1781 | ||
1782 | if (ocfs2_mount_local(osb)) | |
1783 | return 0; | |
1784 | ||
1785 | lockres = &OCFS2_I(inode)->ip_rw_lockres; | |
1786 | ||
1787 | level = write ? DLM_LOCK_EX : DLM_LOCK_PR; | |
1788 | ||
1789 | status = ocfs2_cluster_lock(osb, lockres, level, DLM_LKF_NOQUEUE, 0); | |
1790 | return status; | |
1791 | } | |
1792 | ||
ccd979bd MF |
1793 | void ocfs2_rw_unlock(struct inode *inode, int write) |
1794 | { | |
bd3e7610 | 1795 | int level = write ? DLM_LOCK_EX : DLM_LOCK_PR; |
ccd979bd | 1796 | struct ocfs2_lock_res *lockres = &OCFS2_I(inode)->ip_rw_lockres; |
c271c5c2 | 1797 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
ccd979bd | 1798 | |
b0697053 MF |
1799 | mlog(0, "inode %llu drop %s RW lock\n", |
1800 | (unsigned long long)OCFS2_I(inode)->ip_blkno, | |
ccd979bd MF |
1801 | write ? "EXMODE" : "PRMODE"); |
1802 | ||
c271c5c2 | 1803 | if (!ocfs2_mount_local(osb)) |
1119d3c0 | 1804 | ocfs2_cluster_unlock(osb, lockres, level); |
ccd979bd MF |
1805 | } |
1806 | ||
50008630 TY |
1807 | /* |
1808 | * ocfs2_open_lock always get PR mode lock. | |
1809 | */ | |
1810 | int ocfs2_open_lock(struct inode *inode) | |
1811 | { | |
1812 | int status = 0; | |
1813 | struct ocfs2_lock_res *lockres; | |
1814 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
1815 | ||
50008630 TY |
1816 | mlog(0, "inode %llu take PRMODE open lock\n", |
1817 | (unsigned long long)OCFS2_I(inode)->ip_blkno); | |
1818 | ||
03efed8a | 1819 | if (ocfs2_is_hard_readonly(osb) || ocfs2_mount_local(osb)) |
50008630 TY |
1820 | goto out; |
1821 | ||
1822 | lockres = &OCFS2_I(inode)->ip_open_lockres; | |
1823 | ||
1119d3c0 | 1824 | status = ocfs2_cluster_lock(osb, lockres, DLM_LOCK_PR, 0, 0); |
50008630 TY |
1825 | if (status < 0) |
1826 | mlog_errno(status); | |
1827 | ||
1828 | out: | |
50008630 TY |
1829 | return status; |
1830 | } | |
1831 | ||
1832 | int ocfs2_try_open_lock(struct inode *inode, int write) | |
1833 | { | |
1834 | int status = 0, level; | |
1835 | struct ocfs2_lock_res *lockres; | |
1836 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
1837 | ||
50008630 TY |
1838 | mlog(0, "inode %llu try to take %s open lock\n", |
1839 | (unsigned long long)OCFS2_I(inode)->ip_blkno, | |
1840 | write ? "EXMODE" : "PRMODE"); | |
1841 | ||
03efed8a TY |
1842 | if (ocfs2_is_hard_readonly(osb)) { |
1843 | if (write) | |
1844 | status = -EROFS; | |
1845 | goto out; | |
1846 | } | |
1847 | ||
50008630 TY |
1848 | if (ocfs2_mount_local(osb)) |
1849 | goto out; | |
1850 | ||
1851 | lockres = &OCFS2_I(inode)->ip_open_lockres; | |
1852 | ||
bd3e7610 | 1853 | level = write ? DLM_LOCK_EX : DLM_LOCK_PR; |
50008630 TY |
1854 | |
1855 | /* | |
1856 | * The file system may already holding a PRMODE/EXMODE open lock. | |
bd3e7610 | 1857 | * Since we pass DLM_LKF_NOQUEUE, the request won't block waiting on |
50008630 TY |
1858 | * other nodes and the -EAGAIN will indicate to the caller that |
1859 | * this inode is still in use. | |
1860 | */ | |
1119d3c0 | 1861 | status = ocfs2_cluster_lock(osb, lockres, level, DLM_LKF_NOQUEUE, 0); |
50008630 TY |
1862 | |
1863 | out: | |
50008630 TY |
1864 | return status; |
1865 | } | |
1866 | ||
1867 | /* | |
1868 | * ocfs2_open_unlock unlock PR and EX mode open locks. | |
1869 | */ | |
1870 | void ocfs2_open_unlock(struct inode *inode) | |
1871 | { | |
1872 | struct ocfs2_lock_res *lockres = &OCFS2_I(inode)->ip_open_lockres; | |
1873 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
1874 | ||
50008630 TY |
1875 | mlog(0, "inode %llu drop open lock\n", |
1876 | (unsigned long long)OCFS2_I(inode)->ip_blkno); | |
1877 | ||
1878 | if (ocfs2_mount_local(osb)) | |
1879 | goto out; | |
1880 | ||
1881 | if(lockres->l_ro_holders) | |
1119d3c0 | 1882 | ocfs2_cluster_unlock(osb, lockres, DLM_LOCK_PR); |
50008630 | 1883 | if(lockres->l_ex_holders) |
1119d3c0 | 1884 | ocfs2_cluster_unlock(osb, lockres, DLM_LOCK_EX); |
50008630 TY |
1885 | |
1886 | out: | |
c1e8d35e | 1887 | return; |
50008630 TY |
1888 | } |
1889 | ||
cf8e06f1 MF |
1890 | static int ocfs2_flock_handle_signal(struct ocfs2_lock_res *lockres, |
1891 | int level) | |
1892 | { | |
1893 | int ret; | |
1894 | struct ocfs2_super *osb = ocfs2_get_lockres_osb(lockres); | |
1895 | unsigned long flags; | |
1896 | struct ocfs2_mask_waiter mw; | |
1897 | ||
1898 | ocfs2_init_mask_waiter(&mw); | |
1899 | ||
1900 | retry_cancel: | |
1901 | spin_lock_irqsave(&lockres->l_lock, flags); | |
1902 | if (lockres->l_flags & OCFS2_LOCK_BUSY) { | |
1903 | ret = ocfs2_prepare_cancel_convert(osb, lockres); | |
1904 | if (ret) { | |
1905 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
1906 | ret = ocfs2_cancel_convert(osb, lockres); | |
1907 | if (ret < 0) { | |
1908 | mlog_errno(ret); | |
1909 | goto out; | |
1910 | } | |
1911 | goto retry_cancel; | |
1912 | } | |
1913 | lockres_add_mask_waiter(lockres, &mw, OCFS2_LOCK_BUSY, 0); | |
1914 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
1915 | ||
1916 | ocfs2_wait_for_mask(&mw); | |
1917 | goto retry_cancel; | |
1918 | } | |
1919 | ||
1920 | ret = -ERESTARTSYS; | |
1921 | /* | |
1922 | * We may still have gotten the lock, in which case there's no | |
1923 | * point to restarting the syscall. | |
1924 | */ | |
1925 | if (lockres->l_level == level) | |
1926 | ret = 0; | |
1927 | ||
1928 | mlog(0, "Cancel returning %d. flags: 0x%lx, level: %d, act: %d\n", ret, | |
1929 | lockres->l_flags, lockres->l_level, lockres->l_action); | |
1930 | ||
1931 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
1932 | ||
1933 | out: | |
1934 | return ret; | |
1935 | } | |
1936 | ||
1937 | /* | |
1938 | * ocfs2_file_lock() and ocfs2_file_unlock() map to a single pair of | |
1939 | * flock() calls. The locking approach this requires is sufficiently | |
1940 | * different from all other cluster lock types that we implement a | |
3ad2f3fb | 1941 | * separate path to the "low-level" dlm calls. In particular: |
cf8e06f1 MF |
1942 | * |
1943 | * - No optimization of lock levels is done - we take at exactly | |
1944 | * what's been requested. | |
1945 | * | |
1946 | * - No lock caching is employed. We immediately downconvert to | |
1947 | * no-lock at unlock time. This also means flock locks never go on | |
1948 | * the blocking list). | |
1949 | * | |
1950 | * - Since userspace can trivially deadlock itself with flock, we make | |
1951 | * sure to allow cancellation of a misbehaving applications flock() | |
1952 | * request. | |
1953 | * | |
1954 | * - Access to any flock lockres doesn't require concurrency, so we | |
1955 | * can simplify the code by requiring the caller to guarantee | |
1956 | * serialization of dlmglue flock calls. | |
1957 | */ | |
1958 | int ocfs2_file_lock(struct file *file, int ex, int trylock) | |
1959 | { | |
e988cf1c MF |
1960 | int ret, level = ex ? DLM_LOCK_EX : DLM_LOCK_PR; |
1961 | unsigned int lkm_flags = trylock ? DLM_LKF_NOQUEUE : 0; | |
cf8e06f1 MF |
1962 | unsigned long flags; |
1963 | struct ocfs2_file_private *fp = file->private_data; | |
1964 | struct ocfs2_lock_res *lockres = &fp->fp_flock; | |
1965 | struct ocfs2_super *osb = OCFS2_SB(file->f_mapping->host->i_sb); | |
1966 | struct ocfs2_mask_waiter mw; | |
1967 | ||
1968 | ocfs2_init_mask_waiter(&mw); | |
1969 | ||
1970 | if ((lockres->l_flags & OCFS2_LOCK_BUSY) || | |
bd3e7610 | 1971 | (lockres->l_level > DLM_LOCK_NL)) { |
cf8e06f1 MF |
1972 | mlog(ML_ERROR, |
1973 | "File lock \"%s\" has busy or locked state: flags: 0x%lx, " | |
1974 | "level: %u\n", lockres->l_name, lockres->l_flags, | |
1975 | lockres->l_level); | |
1976 | return -EINVAL; | |
1977 | } | |
1978 | ||
1979 | spin_lock_irqsave(&lockres->l_lock, flags); | |
1980 | if (!(lockres->l_flags & OCFS2_LOCK_ATTACHED)) { | |
1981 | lockres_add_mask_waiter(lockres, &mw, OCFS2_LOCK_BUSY, 0); | |
1982 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
1983 | ||
1984 | /* | |
1985 | * Get the lock at NLMODE to start - that way we | |
1986 | * can cancel the upconvert request if need be. | |
1987 | */ | |
e988cf1c | 1988 | ret = ocfs2_lock_create(osb, lockres, DLM_LOCK_NL, 0); |
cf8e06f1 MF |
1989 | if (ret < 0) { |
1990 | mlog_errno(ret); | |
1991 | goto out; | |
1992 | } | |
1993 | ||
1994 | ret = ocfs2_wait_for_mask(&mw); | |
1995 | if (ret) { | |
1996 | mlog_errno(ret); | |
1997 | goto out; | |
1998 | } | |
1999 | spin_lock_irqsave(&lockres->l_lock, flags); | |
2000 | } | |
2001 | ||
2002 | lockres->l_action = OCFS2_AST_CONVERT; | |
e988cf1c | 2003 | lkm_flags |= DLM_LKF_CONVERT; |
cf8e06f1 MF |
2004 | lockres->l_requested = level; |
2005 | lockres_or_flags(lockres, OCFS2_LOCK_BUSY); | |
2006 | ||
2007 | lockres_add_mask_waiter(lockres, &mw, OCFS2_LOCK_BUSY, 0); | |
2008 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
2009 | ||
4670c46d | 2010 | ret = ocfs2_dlm_lock(osb->cconn, level, &lockres->l_lksb, lkm_flags, |
a796d286 | 2011 | lockres->l_name, OCFS2_LOCK_ID_MAX_LEN - 1); |
7431cd7e JB |
2012 | if (ret) { |
2013 | if (!trylock || (ret != -EAGAIN)) { | |
24ef1815 | 2014 | ocfs2_log_dlm_error("ocfs2_dlm_lock", ret, lockres); |
cf8e06f1 MF |
2015 | ret = -EINVAL; |
2016 | } | |
2017 | ||
2018 | ocfs2_recover_from_dlm_error(lockres, 1); | |
2019 | lockres_remove_mask_waiter(lockres, &mw); | |
2020 | goto out; | |
2021 | } | |
2022 | ||
2023 | ret = ocfs2_wait_for_mask_interruptible(&mw, lockres); | |
2024 | if (ret == -ERESTARTSYS) { | |
2025 | /* | |
2026 | * Userspace can cause deadlock itself with | |
2027 | * flock(). Current behavior locally is to allow the | |
2028 | * deadlock, but abort the system call if a signal is | |
2029 | * received. We follow this example, otherwise a | |
2030 | * poorly written program could sit in kernel until | |
2031 | * reboot. | |
2032 | * | |
2033 | * Handling this is a bit more complicated for Ocfs2 | |
2034 | * though. We can't exit this function with an | |
2035 | * outstanding lock request, so a cancel convert is | |
2036 | * required. We intentionally overwrite 'ret' - if the | |
2037 | * cancel fails and the lock was granted, it's easier | |
af901ca1 | 2038 | * to just bubble success back up to the user. |
cf8e06f1 MF |
2039 | */ |
2040 | ret = ocfs2_flock_handle_signal(lockres, level); | |
1693a5c0 DT |
2041 | } else if (!ret && (level > lockres->l_level)) { |
2042 | /* Trylock failed asynchronously */ | |
2043 | BUG_ON(!trylock); | |
2044 | ret = -EAGAIN; | |
cf8e06f1 MF |
2045 | } |
2046 | ||
2047 | out: | |
2048 | ||
2049 | mlog(0, "Lock: \"%s\" ex: %d, trylock: %d, returns: %d\n", | |
2050 | lockres->l_name, ex, trylock, ret); | |
2051 | return ret; | |
2052 | } | |
2053 | ||
2054 | void ocfs2_file_unlock(struct file *file) | |
2055 | { | |
2056 | int ret; | |
de551246 | 2057 | unsigned int gen; |
cf8e06f1 MF |
2058 | unsigned long flags; |
2059 | struct ocfs2_file_private *fp = file->private_data; | |
2060 | struct ocfs2_lock_res *lockres = &fp->fp_flock; | |
2061 | struct ocfs2_super *osb = OCFS2_SB(file->f_mapping->host->i_sb); | |
2062 | struct ocfs2_mask_waiter mw; | |
2063 | ||
2064 | ocfs2_init_mask_waiter(&mw); | |
2065 | ||
2066 | if (!(lockres->l_flags & OCFS2_LOCK_ATTACHED)) | |
2067 | return; | |
2068 | ||
e988cf1c | 2069 | if (lockres->l_level == DLM_LOCK_NL) |
cf8e06f1 MF |
2070 | return; |
2071 | ||
2072 | mlog(0, "Unlock: \"%s\" flags: 0x%lx, level: %d, act: %d\n", | |
2073 | lockres->l_name, lockres->l_flags, lockres->l_level, | |
2074 | lockres->l_action); | |
2075 | ||
2076 | spin_lock_irqsave(&lockres->l_lock, flags); | |
2077 | /* | |
2078 | * Fake a blocking ast for the downconvert code. | |
2079 | */ | |
2080 | lockres_or_flags(lockres, OCFS2_LOCK_BLOCKED); | |
bd3e7610 | 2081 | lockres->l_blocking = DLM_LOCK_EX; |
cf8e06f1 | 2082 | |
e988cf1c | 2083 | gen = ocfs2_prepare_downconvert(lockres, DLM_LOCK_NL); |
cf8e06f1 MF |
2084 | lockres_add_mask_waiter(lockres, &mw, OCFS2_LOCK_BUSY, 0); |
2085 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
2086 | ||
e988cf1c | 2087 | ret = ocfs2_downconvert_lock(osb, lockres, DLM_LOCK_NL, 0, gen); |
cf8e06f1 MF |
2088 | if (ret) { |
2089 | mlog_errno(ret); | |
2090 | return; | |
2091 | } | |
2092 | ||
2093 | ret = ocfs2_wait_for_mask(&mw); | |
2094 | if (ret) | |
2095 | mlog_errno(ret); | |
2096 | } | |
2097 | ||
34d024f8 MF |
2098 | static void ocfs2_downconvert_on_unlock(struct ocfs2_super *osb, |
2099 | struct ocfs2_lock_res *lockres) | |
ccd979bd MF |
2100 | { |
2101 | int kick = 0; | |
2102 | ||
ccd979bd | 2103 | /* If we know that another node is waiting on our lock, kick |
34d024f8 | 2104 | * the downconvert thread * pre-emptively when we reach a release |
ccd979bd MF |
2105 | * condition. */ |
2106 | if (lockres->l_flags & OCFS2_LOCK_BLOCKED) { | |
2107 | switch(lockres->l_blocking) { | |
bd3e7610 | 2108 | case DLM_LOCK_EX: |
ccd979bd MF |
2109 | if (!lockres->l_ex_holders && !lockres->l_ro_holders) |
2110 | kick = 1; | |
2111 | break; | |
bd3e7610 | 2112 | case DLM_LOCK_PR: |
ccd979bd MF |
2113 | if (!lockres->l_ex_holders) |
2114 | kick = 1; | |
2115 | break; | |
2116 | default: | |
2117 | BUG(); | |
2118 | } | |
2119 | } | |
2120 | ||
2121 | if (kick) | |
34d024f8 | 2122 | ocfs2_wake_downconvert_thread(osb); |
ccd979bd MF |
2123 | } |
2124 | ||
ccd979bd MF |
2125 | #define OCFS2_SEC_BITS 34 |
2126 | #define OCFS2_SEC_SHIFT (64 - 34) | |
2127 | #define OCFS2_NSEC_MASK ((1ULL << OCFS2_SEC_SHIFT) - 1) | |
2128 | ||
2129 | /* LVB only has room for 64 bits of time here so we pack it for | |
2130 | * now. */ | |
3a3d1e51 | 2131 | static u64 ocfs2_pack_timespec(struct timespec64 *spec) |
ccd979bd MF |
2132 | { |
2133 | u64 res; | |
3a3d1e51 | 2134 | u64 sec = clamp_t(time64_t, spec->tv_sec, 0, 0x3ffffffffull); |
ccd979bd MF |
2135 | u32 nsec = spec->tv_nsec; |
2136 | ||
2137 | res = (sec << OCFS2_SEC_SHIFT) | (nsec & OCFS2_NSEC_MASK); | |
2138 | ||
2139 | return res; | |
2140 | } | |
2141 | ||
2142 | /* Call this with the lockres locked. I am reasonably sure we don't | |
2143 | * need ip_lock in this function as anyone who would be changing those | |
e63aecb6 | 2144 | * values is supposed to be blocked in ocfs2_inode_lock right now. */ |
ccd979bd MF |
2145 | static void __ocfs2_stuff_meta_lvb(struct inode *inode) |
2146 | { | |
2147 | struct ocfs2_inode_info *oi = OCFS2_I(inode); | |
e63aecb6 | 2148 | struct ocfs2_lock_res *lockres = &oi->ip_inode_lockres; |
ccd979bd MF |
2149 | struct ocfs2_meta_lvb *lvb; |
2150 | ||
a641dc2a | 2151 | lvb = ocfs2_dlm_lvb(&lockres->l_lksb); |
ccd979bd | 2152 | |
24c19ef4 MF |
2153 | /* |
2154 | * Invalidate the LVB of a deleted inode - this way other | |
2155 | * nodes are forced to go to disk and discover the new inode | |
2156 | * status. | |
2157 | */ | |
2158 | if (oi->ip_flags & OCFS2_INODE_DELETED) { | |
2159 | lvb->lvb_version = 0; | |
2160 | goto out; | |
2161 | } | |
2162 | ||
4d3b83f7 | 2163 | lvb->lvb_version = OCFS2_LVB_VERSION; |
ccd979bd MF |
2164 | lvb->lvb_isize = cpu_to_be64(i_size_read(inode)); |
2165 | lvb->lvb_iclusters = cpu_to_be32(oi->ip_clusters); | |
03ab30f7 EB |
2166 | lvb->lvb_iuid = cpu_to_be32(i_uid_read(inode)); |
2167 | lvb->lvb_igid = cpu_to_be32(i_gid_read(inode)); | |
ccd979bd MF |
2168 | lvb->lvb_imode = cpu_to_be16(inode->i_mode); |
2169 | lvb->lvb_inlink = cpu_to_be16(inode->i_nlink); | |
2170 | lvb->lvb_iatime_packed = | |
3a3d1e51 | 2171 | cpu_to_be64(ocfs2_pack_timespec(&inode->i_atime)); |
ccd979bd | 2172 | lvb->lvb_ictime_packed = |
3a3d1e51 | 2173 | cpu_to_be64(ocfs2_pack_timespec(&inode->i_ctime)); |
ccd979bd | 2174 | lvb->lvb_imtime_packed = |
3a3d1e51 | 2175 | cpu_to_be64(ocfs2_pack_timespec(&inode->i_mtime)); |
ca4d147e | 2176 | lvb->lvb_iattr = cpu_to_be32(oi->ip_attr); |
15b1e36b | 2177 | lvb->lvb_idynfeatures = cpu_to_be16(oi->ip_dyn_features); |
f9e2d82e | 2178 | lvb->lvb_igeneration = cpu_to_be32(inode->i_generation); |
ccd979bd | 2179 | |
24c19ef4 | 2180 | out: |
ccd979bd | 2181 | mlog_meta_lvb(0, lockres); |
ccd979bd MF |
2182 | } |
2183 | ||
3a3d1e51 | 2184 | static void ocfs2_unpack_timespec(struct timespec64 *spec, |
ccd979bd MF |
2185 | u64 packed_time) |
2186 | { | |
2187 | spec->tv_sec = packed_time >> OCFS2_SEC_SHIFT; | |
2188 | spec->tv_nsec = packed_time & OCFS2_NSEC_MASK; | |
2189 | } | |
2190 | ||
2191 | static void ocfs2_refresh_inode_from_lvb(struct inode *inode) | |
2192 | { | |
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)); |
3a3d1e51 | 2220 | ocfs2_unpack_timespec(&inode->i_atime, |
ccd979bd | 2221 | be64_to_cpu(lvb->lvb_iatime_packed)); |
3a3d1e51 | 2222 | ocfs2_unpack_timespec(&inode->i_mtime, |
ccd979bd | 2223 | be64_to_cpu(lvb->lvb_imtime_packed)); |
3a3d1e51 | 2224 | ocfs2_unpack_timespec(&inode->i_ctime, |
ccd979bd MF |
2225 | be64_to_cpu(lvb->lvb_ictime_packed)); |
2226 | spin_unlock(&oi->ip_lock); | |
ccd979bd MF |
2227 | } |
2228 | ||
f9e2d82e MF |
2229 | static inline int ocfs2_meta_lvb_is_trustable(struct inode *inode, |
2230 | struct ocfs2_lock_res *lockres) | |
ccd979bd | 2231 | { |
a641dc2a | 2232 | struct ocfs2_meta_lvb *lvb = ocfs2_dlm_lvb(&lockres->l_lksb); |
ccd979bd | 2233 | |
1c520dfb JB |
2234 | if (ocfs2_dlm_lvb_valid(&lockres->l_lksb) |
2235 | && lvb->lvb_version == OCFS2_LVB_VERSION | |
f9e2d82e | 2236 | && be32_to_cpu(lvb->lvb_igeneration) == inode->i_generation) |
ccd979bd MF |
2237 | return 1; |
2238 | return 0; | |
2239 | } | |
2240 | ||
2241 | /* Determine whether a lock resource needs to be refreshed, and | |
2242 | * arbitrate who gets to refresh it. | |
2243 | * | |
2244 | * 0 means no refresh needed. | |
2245 | * | |
2246 | * > 0 means you need to refresh this and you MUST call | |
2247 | * ocfs2_complete_lock_res_refresh afterwards. */ | |
2248 | static int ocfs2_should_refresh_lock_res(struct ocfs2_lock_res *lockres) | |
2249 | { | |
2250 | unsigned long flags; | |
2251 | int status = 0; | |
2252 | ||
ccd979bd MF |
2253 | refresh_check: |
2254 | spin_lock_irqsave(&lockres->l_lock, flags); | |
2255 | if (!(lockres->l_flags & OCFS2_LOCK_NEEDS_REFRESH)) { | |
2256 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
2257 | goto bail; | |
2258 | } | |
2259 | ||
2260 | if (lockres->l_flags & OCFS2_LOCK_REFRESHING) { | |
2261 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
2262 | ||
2263 | ocfs2_wait_on_refreshing_lock(lockres); | |
2264 | goto refresh_check; | |
2265 | } | |
2266 | ||
2267 | /* Ok, I'll be the one to refresh this lock. */ | |
2268 | lockres_or_flags(lockres, OCFS2_LOCK_REFRESHING); | |
2269 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
2270 | ||
2271 | status = 1; | |
2272 | bail: | |
c1e8d35e | 2273 | mlog(0, "status %d\n", status); |
ccd979bd MF |
2274 | return status; |
2275 | } | |
2276 | ||
2277 | /* If status is non zero, I'll mark it as not being in refresh | |
2278 | * anymroe, but i won't clear the needs refresh flag. */ | |
2279 | static inline void ocfs2_complete_lock_res_refresh(struct ocfs2_lock_res *lockres, | |
2280 | int status) | |
2281 | { | |
2282 | unsigned long flags; | |
ccd979bd MF |
2283 | |
2284 | spin_lock_irqsave(&lockres->l_lock, flags); | |
2285 | lockres_clear_flags(lockres, OCFS2_LOCK_REFRESHING); | |
2286 | if (!status) | |
2287 | lockres_clear_flags(lockres, OCFS2_LOCK_NEEDS_REFRESH); | |
2288 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
2289 | ||
2290 | wake_up(&lockres->l_event); | |
ccd979bd MF |
2291 | } |
2292 | ||
2293 | /* may or may not return a bh if it went to disk. */ | |
e63aecb6 | 2294 | static int ocfs2_inode_lock_update(struct inode *inode, |
ccd979bd MF |
2295 | struct buffer_head **bh) |
2296 | { | |
2297 | int status = 0; | |
2298 | struct ocfs2_inode_info *oi = OCFS2_I(inode); | |
e63aecb6 | 2299 | struct ocfs2_lock_res *lockres = &oi->ip_inode_lockres; |
ccd979bd | 2300 | struct ocfs2_dinode *fe; |
c271c5c2 | 2301 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
ccd979bd | 2302 | |
be9e986b MF |
2303 | if (ocfs2_mount_local(osb)) |
2304 | goto bail; | |
2305 | ||
ccd979bd MF |
2306 | spin_lock(&oi->ip_lock); |
2307 | if (oi->ip_flags & OCFS2_INODE_DELETED) { | |
b0697053 | 2308 | mlog(0, "Orphaned inode %llu was deleted while we " |
ccd979bd | 2309 | "were waiting on a lock. ip_flags = 0x%x\n", |
b0697053 | 2310 | (unsigned long long)oi->ip_blkno, oi->ip_flags); |
ccd979bd MF |
2311 | spin_unlock(&oi->ip_lock); |
2312 | status = -ENOENT; | |
2313 | goto bail; | |
2314 | } | |
2315 | spin_unlock(&oi->ip_lock); | |
2316 | ||
be9e986b MF |
2317 | if (!ocfs2_should_refresh_lock_res(lockres)) |
2318 | goto bail; | |
ccd979bd MF |
2319 | |
2320 | /* This will discard any caching information we might have had | |
2321 | * for the inode metadata. */ | |
8cb471e8 | 2322 | ocfs2_metadata_cache_purge(INODE_CACHE(inode)); |
ccd979bd | 2323 | |
83418978 MF |
2324 | ocfs2_extent_map_trunc(inode, 0); |
2325 | ||
be9e986b | 2326 | if (ocfs2_meta_lvb_is_trustable(inode, lockres)) { |
b0697053 MF |
2327 | mlog(0, "Trusting LVB on inode %llu\n", |
2328 | (unsigned long long)oi->ip_blkno); | |
ccd979bd MF |
2329 | ocfs2_refresh_inode_from_lvb(inode); |
2330 | } else { | |
2331 | /* Boo, we have to go to disk. */ | |
2332 | /* read bh, cast, ocfs2_refresh_inode */ | |
b657c95c | 2333 | status = ocfs2_read_inode_block(inode, bh); |
ccd979bd MF |
2334 | if (status < 0) { |
2335 | mlog_errno(status); | |
2336 | goto bail_refresh; | |
2337 | } | |
2338 | fe = (struct ocfs2_dinode *) (*bh)->b_data; | |
2339 | ||
2340 | /* This is a good chance to make sure we're not | |
b657c95c JB |
2341 | * locking an invalid object. ocfs2_read_inode_block() |
2342 | * already checked that the inode block is sane. | |
ccd979bd MF |
2343 | * |
2344 | * We bug on a stale inode here because we checked | |
2345 | * above whether it was wiped from disk. The wiping | |
2346 | * node provides a guarantee that we receive that | |
2347 | * message and can mark the inode before dropping any | |
2348 | * locks associated with it. */ | |
ccd979bd MF |
2349 | mlog_bug_on_msg(inode->i_generation != |
2350 | le32_to_cpu(fe->i_generation), | |
b0697053 | 2351 | "Invalid dinode %llu disk generation: %u " |
ccd979bd | 2352 | "inode->i_generation: %u\n", |
b0697053 MF |
2353 | (unsigned long long)oi->ip_blkno, |
2354 | le32_to_cpu(fe->i_generation), | |
ccd979bd MF |
2355 | inode->i_generation); |
2356 | mlog_bug_on_msg(le64_to_cpu(fe->i_dtime) || | |
2357 | !(fe->i_flags & cpu_to_le32(OCFS2_VALID_FL)), | |
b0697053 MF |
2358 | "Stale dinode %llu dtime: %llu flags: 0x%x\n", |
2359 | (unsigned long long)oi->ip_blkno, | |
2360 | (unsigned long long)le64_to_cpu(fe->i_dtime), | |
ccd979bd MF |
2361 | le32_to_cpu(fe->i_flags)); |
2362 | ||
2363 | ocfs2_refresh_inode(inode, fe); | |
8ddb7b00 | 2364 | ocfs2_track_lock_refresh(lockres); |
ccd979bd MF |
2365 | } |
2366 | ||
2367 | status = 0; | |
2368 | bail_refresh: | |
be9e986b | 2369 | ocfs2_complete_lock_res_refresh(lockres, status); |
ccd979bd | 2370 | bail: |
ccd979bd MF |
2371 | return status; |
2372 | } | |
2373 | ||
2374 | static int ocfs2_assign_bh(struct inode *inode, | |
2375 | struct buffer_head **ret_bh, | |
2376 | struct buffer_head *passed_bh) | |
2377 | { | |
2378 | int status; | |
2379 | ||
2380 | if (passed_bh) { | |
2381 | /* Ok, the update went to disk for us, use the | |
2382 | * returned bh. */ | |
2383 | *ret_bh = passed_bh; | |
2384 | get_bh(*ret_bh); | |
2385 | ||
2386 | return 0; | |
2387 | } | |
2388 | ||
b657c95c | 2389 | status = ocfs2_read_inode_block(inode, ret_bh); |
ccd979bd MF |
2390 | if (status < 0) |
2391 | mlog_errno(status); | |
2392 | ||
2393 | return status; | |
2394 | } | |
2395 | ||
2396 | /* | |
2397 | * returns < 0 error if the callback will never be called, otherwise | |
2398 | * the result of the lock will be communicated via the callback. | |
2399 | */ | |
cb25797d JK |
2400 | int ocfs2_inode_lock_full_nested(struct inode *inode, |
2401 | struct buffer_head **ret_bh, | |
2402 | int ex, | |
2403 | int arg_flags, | |
2404 | int subclass) | |
ccd979bd | 2405 | { |
bd3e7610 JB |
2406 | int status, level, acquired; |
2407 | u32 dlm_flags; | |
c271c5c2 | 2408 | struct ocfs2_lock_res *lockres = NULL; |
ccd979bd MF |
2409 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
2410 | struct buffer_head *local_bh = NULL; | |
2411 | ||
b0697053 MF |
2412 | mlog(0, "inode %llu, take %s META lock\n", |
2413 | (unsigned long long)OCFS2_I(inode)->ip_blkno, | |
ccd979bd MF |
2414 | ex ? "EXMODE" : "PRMODE"); |
2415 | ||
2416 | status = 0; | |
2417 | acquired = 0; | |
2418 | /* We'll allow faking a readonly metadata lock for | |
2419 | * rodevices. */ | |
2420 | if (ocfs2_is_hard_readonly(osb)) { | |
2421 | if (ex) | |
2422 | status = -EROFS; | |
03efed8a | 2423 | goto getbh; |
ccd979bd MF |
2424 | } |
2425 | ||
439a36b8 ER |
2426 | if ((arg_flags & OCFS2_META_LOCK_GETBH) || |
2427 | ocfs2_mount_local(osb)) | |
2428 | goto update; | |
c271c5c2 | 2429 | |
ccd979bd | 2430 | if (!(arg_flags & OCFS2_META_LOCK_RECOVERY)) |
553abd04 | 2431 | ocfs2_wait_for_recovery(osb); |
ccd979bd | 2432 | |
e63aecb6 | 2433 | lockres = &OCFS2_I(inode)->ip_inode_lockres; |
bd3e7610 | 2434 | level = ex ? DLM_LOCK_EX : DLM_LOCK_PR; |
ccd979bd MF |
2435 | dlm_flags = 0; |
2436 | if (arg_flags & OCFS2_META_LOCK_NOQUEUE) | |
bd3e7610 | 2437 | dlm_flags |= DLM_LKF_NOQUEUE; |
ccd979bd | 2438 | |
cb25797d JK |
2439 | status = __ocfs2_cluster_lock(osb, lockres, level, dlm_flags, |
2440 | arg_flags, subclass, _RET_IP_); | |
ccd979bd | 2441 | if (status < 0) { |
41003a7b | 2442 | if (status != -EAGAIN) |
ccd979bd MF |
2443 | mlog_errno(status); |
2444 | goto bail; | |
2445 | } | |
2446 | ||
2447 | /* Notify the error cleanup path to drop the cluster lock. */ | |
2448 | acquired = 1; | |
2449 | ||
2450 | /* We wait twice because a node may have died while we were in | |
2451 | * the lower dlm layers. The second time though, we've | |
2452 | * committed to owning this lock so we don't allow signals to | |
2453 | * abort the operation. */ | |
2454 | if (!(arg_flags & OCFS2_META_LOCK_RECOVERY)) | |
553abd04 | 2455 | ocfs2_wait_for_recovery(osb); |
ccd979bd | 2456 | |
439a36b8 | 2457 | update: |
24c19ef4 MF |
2458 | /* |
2459 | * We only see this flag if we're being called from | |
2460 | * ocfs2_read_locked_inode(). It means we're locking an inode | |
2461 | * which hasn't been populated yet, so clear the refresh flag | |
2462 | * and let the caller handle it. | |
2463 | */ | |
2464 | if (inode->i_state & I_NEW) { | |
2465 | status = 0; | |
c271c5c2 SM |
2466 | if (lockres) |
2467 | ocfs2_complete_lock_res_refresh(lockres, 0); | |
24c19ef4 MF |
2468 | goto bail; |
2469 | } | |
2470 | ||
ccd979bd | 2471 | /* This is fun. The caller may want a bh back, or it may |
e63aecb6 | 2472 | * not. ocfs2_inode_lock_update definitely wants one in, but |
ccd979bd MF |
2473 | * may or may not read one, depending on what's in the |
2474 | * LVB. The result of all of this is that we've *only* gone to | |
2475 | * disk if we have to, so the complexity is worthwhile. */ | |
e63aecb6 | 2476 | status = ocfs2_inode_lock_update(inode, &local_bh); |
ccd979bd MF |
2477 | if (status < 0) { |
2478 | if (status != -ENOENT) | |
2479 | mlog_errno(status); | |
2480 | goto bail; | |
2481 | } | |
03efed8a | 2482 | getbh: |
ccd979bd MF |
2483 | if (ret_bh) { |
2484 | status = ocfs2_assign_bh(inode, ret_bh, local_bh); | |
2485 | if (status < 0) { | |
2486 | mlog_errno(status); | |
2487 | goto bail; | |
2488 | } | |
2489 | } | |
2490 | ||
ccd979bd MF |
2491 | bail: |
2492 | if (status < 0) { | |
2493 | if (ret_bh && (*ret_bh)) { | |
2494 | brelse(*ret_bh); | |
2495 | *ret_bh = NULL; | |
2496 | } | |
2497 | if (acquired) | |
e63aecb6 | 2498 | ocfs2_inode_unlock(inode, ex); |
ccd979bd MF |
2499 | } |
2500 | ||
2501 | if (local_bh) | |
2502 | brelse(local_bh); | |
2503 | ||
ccd979bd MF |
2504 | return status; |
2505 | } | |
2506 | ||
2507 | /* | |
34d024f8 MF |
2508 | * This is working around a lock inversion between tasks acquiring DLM |
2509 | * locks while holding a page lock and the downconvert thread which | |
2510 | * blocks dlm lock acquiry while acquiring page locks. | |
ccd979bd MF |
2511 | * |
2512 | * ** These _with_page variantes are only intended to be called from aop | |
2513 | * methods that hold page locks and return a very specific *positive* error | |
2514 | * code that aop methods pass up to the VFS -- test for errors with != 0. ** | |
2515 | * | |
34d024f8 MF |
2516 | * The DLM is called such that it returns -EAGAIN if it would have |
2517 | * blocked waiting for the downconvert thread. In that case we unlock | |
2518 | * our page so the downconvert thread can make progress. Once we've | |
2519 | * done this we have to return AOP_TRUNCATED_PAGE so the aop method | |
2520 | * that called us can bubble that back up into the VFS who will then | |
2521 | * immediately retry the aop call. | |
ccd979bd | 2522 | */ |
e63aecb6 | 2523 | int ocfs2_inode_lock_with_page(struct inode *inode, |
ccd979bd MF |
2524 | struct buffer_head **ret_bh, |
2525 | int ex, | |
2526 | struct page *page) | |
2527 | { | |
2528 | int ret; | |
2529 | ||
e63aecb6 | 2530 | ret = ocfs2_inode_lock_full(inode, ret_bh, ex, OCFS2_LOCK_NONBLOCK); |
ccd979bd MF |
2531 | if (ret == -EAGAIN) { |
2532 | unlock_page(page); | |
ff26cc10 GH |
2533 | /* |
2534 | * If we can't get inode lock immediately, we should not return | |
2535 | * directly here, since this will lead to a softlockup problem. | |
2536 | * The method is to get a blocking lock and immediately unlock | |
2537 | * before returning, this can avoid CPU resource waste due to | |
2538 | * lots of retries, and benefits fairness in getting lock. | |
2539 | */ | |
2540 | if (ocfs2_inode_lock(inode, ret_bh, ex) == 0) | |
2541 | ocfs2_inode_unlock(inode, ex); | |
ccd979bd MF |
2542 | ret = AOP_TRUNCATED_PAGE; |
2543 | } | |
2544 | ||
2545 | return ret; | |
2546 | } | |
2547 | ||
e63aecb6 | 2548 | int ocfs2_inode_lock_atime(struct inode *inode, |
7f1a37e3 | 2549 | struct vfsmount *vfsmnt, |
c4c2416a | 2550 | int *level, int wait) |
7f1a37e3 TY |
2551 | { |
2552 | int ret; | |
2553 | ||
c4c2416a GH |
2554 | if (wait) |
2555 | ret = ocfs2_inode_lock(inode, NULL, 0); | |
2556 | else | |
2557 | ret = ocfs2_try_inode_lock(inode, NULL, 0); | |
2558 | ||
7f1a37e3 | 2559 | if (ret < 0) { |
c4c2416a GH |
2560 | if (ret != -EAGAIN) |
2561 | mlog_errno(ret); | |
7f1a37e3 TY |
2562 | return ret; |
2563 | } | |
2564 | ||
2565 | /* | |
2566 | * If we should update atime, we will get EX lock, | |
2567 | * otherwise we just get PR lock. | |
2568 | */ | |
2569 | if (ocfs2_should_update_atime(inode, vfsmnt)) { | |
2570 | struct buffer_head *bh = NULL; | |
2571 | ||
e63aecb6 | 2572 | ocfs2_inode_unlock(inode, 0); |
c4c2416a GH |
2573 | if (wait) |
2574 | ret = ocfs2_inode_lock(inode, &bh, 1); | |
2575 | else | |
2576 | ret = ocfs2_try_inode_lock(inode, &bh, 1); | |
2577 | ||
7f1a37e3 | 2578 | if (ret < 0) { |
c4c2416a GH |
2579 | if (ret != -EAGAIN) |
2580 | mlog_errno(ret); | |
7f1a37e3 TY |
2581 | return ret; |
2582 | } | |
2583 | *level = 1; | |
2584 | if (ocfs2_should_update_atime(inode, vfsmnt)) | |
2585 | ocfs2_update_inode_atime(inode, bh); | |
2586 | if (bh) | |
2587 | brelse(bh); | |
2588 | } else | |
2589 | *level = 0; | |
2590 | ||
7f1a37e3 TY |
2591 | return ret; |
2592 | } | |
2593 | ||
e63aecb6 | 2594 | void ocfs2_inode_unlock(struct inode *inode, |
ccd979bd MF |
2595 | int ex) |
2596 | { | |
bd3e7610 | 2597 | int level = ex ? DLM_LOCK_EX : DLM_LOCK_PR; |
e63aecb6 | 2598 | struct ocfs2_lock_res *lockres = &OCFS2_I(inode)->ip_inode_lockres; |
c271c5c2 | 2599 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
ccd979bd | 2600 | |
b0697053 MF |
2601 | mlog(0, "inode %llu drop %s META lock\n", |
2602 | (unsigned long long)OCFS2_I(inode)->ip_blkno, | |
ccd979bd MF |
2603 | ex ? "EXMODE" : "PRMODE"); |
2604 | ||
1119d3c0 | 2605 | if (!ocfs2_is_hard_readonly(osb) && |
c271c5c2 | 2606 | !ocfs2_mount_local(osb)) |
1119d3c0 | 2607 | ocfs2_cluster_unlock(osb, lockres, level); |
ccd979bd MF |
2608 | } |
2609 | ||
439a36b8 ER |
2610 | /* |
2611 | * This _tracker variantes are introduced to deal with the recursive cluster | |
2612 | * locking issue. The idea is to keep track of a lock holder on the stack of | |
2613 | * the current process. If there's a lock holder on the stack, we know the | |
2614 | * task context is already protected by cluster locking. Currently, they're | |
2615 | * used in some VFS entry routines. | |
2616 | * | |
2617 | * return < 0 on error, return == 0 if there's no lock holder on the stack | |
2618 | * before this call, return == 1 if this call would be a recursive locking. | |
133b81f2 LC |
2619 | * return == -1 if this lock attempt will cause an upgrade which is forbidden. |
2620 | * | |
2621 | * When taking lock levels into account,we face some different situations. | |
2622 | * | |
2623 | * 1. no lock is held | |
2624 | * In this case, just lock the inode as requested and return 0 | |
2625 | * | |
2626 | * 2. We are holding a lock | |
2627 | * For this situation, things diverges into several cases | |
2628 | * | |
2629 | * wanted holding what to do | |
2630 | * ex ex see 2.1 below | |
2631 | * ex pr see 2.2 below | |
2632 | * pr ex see 2.1 below | |
2633 | * pr pr see 2.1 below | |
2634 | * | |
2635 | * 2.1 lock level that is been held is compatible | |
2636 | * with the wanted level, so no lock action will be tacken. | |
2637 | * | |
2638 | * 2.2 Otherwise, an upgrade is needed, but it is forbidden. | |
2639 | * | |
2640 | * Reason why upgrade within a process is forbidden is that | |
2641 | * lock upgrade may cause dead lock. The following illustrates | |
2642 | * how it happens. | |
2643 | * | |
2644 | * thread on node1 thread on node2 | |
2645 | * ocfs2_inode_lock_tracker(ex=0) | |
2646 | * | |
2647 | * <====== ocfs2_inode_lock_tracker(ex=1) | |
2648 | * | |
2649 | * ocfs2_inode_lock_tracker(ex=1) | |
439a36b8 ER |
2650 | */ |
2651 | int ocfs2_inode_lock_tracker(struct inode *inode, | |
2652 | struct buffer_head **ret_bh, | |
2653 | int ex, | |
2654 | struct ocfs2_lock_holder *oh) | |
2655 | { | |
133b81f2 | 2656 | int status = 0; |
439a36b8 | 2657 | struct ocfs2_lock_res *lockres; |
133b81f2 LC |
2658 | struct ocfs2_lock_holder *tmp_oh; |
2659 | struct pid *pid = task_pid(current); | |
2660 | ||
439a36b8 ER |
2661 | |
2662 | lockres = &OCFS2_I(inode)->ip_inode_lockres; | |
133b81f2 | 2663 | tmp_oh = ocfs2_pid_holder(lockres, pid); |
439a36b8 | 2664 | |
133b81f2 LC |
2665 | if (!tmp_oh) { |
2666 | /* | |
2667 | * This corresponds to the case 1. | |
2668 | * We haven't got any lock before. | |
2669 | */ | |
2670 | status = ocfs2_inode_lock_full(inode, ret_bh, ex, 0); | |
439a36b8 ER |
2671 | if (status < 0) { |
2672 | if (status != -ENOENT) | |
2673 | mlog_errno(status); | |
2674 | return status; | |
2675 | } | |
133b81f2 LC |
2676 | |
2677 | oh->oh_ex = ex; | |
439a36b8 | 2678 | ocfs2_add_holder(lockres, oh); |
133b81f2 LC |
2679 | return 0; |
2680 | } | |
439a36b8 | 2681 | |
133b81f2 LC |
2682 | if (unlikely(ex && !tmp_oh->oh_ex)) { |
2683 | /* | |
2684 | * case 2.2 upgrade may cause dead lock, forbid it. | |
2685 | */ | |
2686 | mlog(ML_ERROR, "Recursive locking is not permitted to " | |
2687 | "upgrade to EX level from PR level.\n"); | |
2688 | dump_stack(); | |
2689 | return -EINVAL; | |
2690 | } | |
2691 | ||
2692 | /* | |
2693 | * case 2.1 OCFS2_META_LOCK_GETBH flag make ocfs2_inode_lock_full. | |
2694 | * ignore the lock level and just update it. | |
2695 | */ | |
2696 | if (ret_bh) { | |
2697 | status = ocfs2_inode_lock_full(inode, ret_bh, ex, | |
2698 | OCFS2_META_LOCK_GETBH); | |
2699 | if (status < 0) { | |
2700 | if (status != -ENOENT) | |
2701 | mlog_errno(status); | |
2702 | return status; | |
2703 | } | |
2704 | } | |
2705 | return tmp_oh ? 1 : 0; | |
439a36b8 ER |
2706 | } |
2707 | ||
2708 | void ocfs2_inode_unlock_tracker(struct inode *inode, | |
2709 | int ex, | |
2710 | struct ocfs2_lock_holder *oh, | |
2711 | int had_lock) | |
2712 | { | |
2713 | struct ocfs2_lock_res *lockres; | |
2714 | ||
2715 | lockres = &OCFS2_I(inode)->ip_inode_lockres; | |
8818efaa | 2716 | /* had_lock means that the currect process already takes the cluster |
133b81f2 LC |
2717 | * lock previously. |
2718 | * If had_lock is 1, we have nothing to do here. | |
2719 | * If had_lock is 0, we will release the lock. | |
8818efaa | 2720 | */ |
439a36b8 | 2721 | if (!had_lock) { |
133b81f2 | 2722 | ocfs2_inode_unlock(inode, oh->oh_ex); |
439a36b8 | 2723 | ocfs2_remove_holder(lockres, oh); |
439a36b8 ER |
2724 | } |
2725 | } | |
2726 | ||
df152c24 | 2727 | int ocfs2_orphan_scan_lock(struct ocfs2_super *osb, u32 *seqno) |
83273932 SE |
2728 | { |
2729 | struct ocfs2_lock_res *lockres; | |
2730 | struct ocfs2_orphan_scan_lvb *lvb; | |
83273932 SE |
2731 | int status = 0; |
2732 | ||
df152c24 SM |
2733 | if (ocfs2_is_hard_readonly(osb)) |
2734 | return -EROFS; | |
2735 | ||
2736 | if (ocfs2_mount_local(osb)) | |
2737 | return 0; | |
2738 | ||
83273932 | 2739 | lockres = &osb->osb_orphan_scan.os_lockres; |
df152c24 | 2740 | status = ocfs2_cluster_lock(osb, lockres, DLM_LOCK_EX, 0, 0); |
83273932 SE |
2741 | if (status < 0) |
2742 | return status; | |
2743 | ||
2744 | lvb = ocfs2_dlm_lvb(&lockres->l_lksb); | |
1c520dfb JB |
2745 | if (ocfs2_dlm_lvb_valid(&lockres->l_lksb) && |
2746 | lvb->lvb_version == OCFS2_ORPHAN_LVB_VERSION) | |
83273932 | 2747 | *seqno = be32_to_cpu(lvb->lvb_os_seqno); |
3211949f SM |
2748 | else |
2749 | *seqno = osb->osb_orphan_scan.os_seqno + 1; | |
2750 | ||
83273932 SE |
2751 | return status; |
2752 | } | |
2753 | ||
df152c24 | 2754 | void ocfs2_orphan_scan_unlock(struct ocfs2_super *osb, u32 seqno) |
83273932 SE |
2755 | { |
2756 | struct ocfs2_lock_res *lockres; | |
2757 | struct ocfs2_orphan_scan_lvb *lvb; | |
83273932 | 2758 | |
df152c24 SM |
2759 | if (!ocfs2_is_hard_readonly(osb) && !ocfs2_mount_local(osb)) { |
2760 | lockres = &osb->osb_orphan_scan.os_lockres; | |
2761 | lvb = ocfs2_dlm_lvb(&lockres->l_lksb); | |
2762 | lvb->lvb_version = OCFS2_ORPHAN_LVB_VERSION; | |
2763 | lvb->lvb_os_seqno = cpu_to_be32(seqno); | |
2764 | ocfs2_cluster_unlock(osb, lockres, DLM_LOCK_EX); | |
2765 | } | |
83273932 SE |
2766 | } |
2767 | ||
ccd979bd MF |
2768 | int ocfs2_super_lock(struct ocfs2_super *osb, |
2769 | int ex) | |
2770 | { | |
c271c5c2 | 2771 | int status = 0; |
bd3e7610 | 2772 | int level = ex ? DLM_LOCK_EX : DLM_LOCK_PR; |
ccd979bd | 2773 | struct ocfs2_lock_res *lockres = &osb->osb_super_lockres; |
ccd979bd | 2774 | |
ccd979bd MF |
2775 | if (ocfs2_is_hard_readonly(osb)) |
2776 | return -EROFS; | |
2777 | ||
c271c5c2 SM |
2778 | if (ocfs2_mount_local(osb)) |
2779 | goto bail; | |
2780 | ||
ccd979bd MF |
2781 | status = ocfs2_cluster_lock(osb, lockres, level, 0, 0); |
2782 | if (status < 0) { | |
2783 | mlog_errno(status); | |
2784 | goto bail; | |
2785 | } | |
2786 | ||
2787 | /* The super block lock path is really in the best position to | |
2788 | * know when resources covered by the lock need to be | |
2789 | * refreshed, so we do it here. Of course, making sense of | |
2790 | * everything is up to the caller :) */ | |
2791 | status = ocfs2_should_refresh_lock_res(lockres); | |
ccd979bd | 2792 | if (status) { |
8e8a4603 | 2793 | status = ocfs2_refresh_slot_info(osb); |
ccd979bd MF |
2794 | |
2795 | ocfs2_complete_lock_res_refresh(lockres, status); | |
2796 | ||
3278bb74 JB |
2797 | if (status < 0) { |
2798 | ocfs2_cluster_unlock(osb, lockres, level); | |
ccd979bd | 2799 | mlog_errno(status); |
3278bb74 | 2800 | } |
8ddb7b00 | 2801 | ocfs2_track_lock_refresh(lockres); |
ccd979bd MF |
2802 | } |
2803 | bail: | |
ccd979bd MF |
2804 | return status; |
2805 | } | |
2806 | ||
2807 | void ocfs2_super_unlock(struct ocfs2_super *osb, | |
2808 | int ex) | |
2809 | { | |
bd3e7610 | 2810 | int level = ex ? DLM_LOCK_EX : DLM_LOCK_PR; |
ccd979bd MF |
2811 | struct ocfs2_lock_res *lockres = &osb->osb_super_lockres; |
2812 | ||
c271c5c2 SM |
2813 | if (!ocfs2_mount_local(osb)) |
2814 | ocfs2_cluster_unlock(osb, lockres, level); | |
ccd979bd MF |
2815 | } |
2816 | ||
2817 | int ocfs2_rename_lock(struct ocfs2_super *osb) | |
2818 | { | |
2819 | int status; | |
2820 | struct ocfs2_lock_res *lockres = &osb->osb_rename_lockres; | |
2821 | ||
2822 | if (ocfs2_is_hard_readonly(osb)) | |
2823 | return -EROFS; | |
2824 | ||
c271c5c2 SM |
2825 | if (ocfs2_mount_local(osb)) |
2826 | return 0; | |
2827 | ||
bd3e7610 | 2828 | status = ocfs2_cluster_lock(osb, lockres, DLM_LOCK_EX, 0, 0); |
ccd979bd MF |
2829 | if (status < 0) |
2830 | mlog_errno(status); | |
2831 | ||
2832 | return status; | |
2833 | } | |
2834 | ||
2835 | void ocfs2_rename_unlock(struct ocfs2_super *osb) | |
2836 | { | |
2837 | struct ocfs2_lock_res *lockres = &osb->osb_rename_lockres; | |
2838 | ||
c271c5c2 | 2839 | if (!ocfs2_mount_local(osb)) |
bd3e7610 | 2840 | ocfs2_cluster_unlock(osb, lockres, DLM_LOCK_EX); |
ccd979bd MF |
2841 | } |
2842 | ||
6ca497a8 | 2843 | int ocfs2_nfs_sync_lock(struct ocfs2_super *osb, int ex) |
2844 | { | |
2845 | int status; | |
2846 | struct ocfs2_lock_res *lockres = &osb->osb_nfs_sync_lockres; | |
2847 | ||
2848 | if (ocfs2_is_hard_readonly(osb)) | |
2849 | return -EROFS; | |
2850 | ||
2851 | if (ocfs2_mount_local(osb)) | |
2852 | return 0; | |
2853 | ||
2854 | status = ocfs2_cluster_lock(osb, lockres, ex ? LKM_EXMODE : LKM_PRMODE, | |
2855 | 0, 0); | |
2856 | if (status < 0) | |
2857 | mlog(ML_ERROR, "lock on nfs sync lock failed %d\n", status); | |
2858 | ||
2859 | return status; | |
2860 | } | |
2861 | ||
2862 | void ocfs2_nfs_sync_unlock(struct ocfs2_super *osb, int ex) | |
2863 | { | |
2864 | struct ocfs2_lock_res *lockres = &osb->osb_nfs_sync_lockres; | |
2865 | ||
2866 | if (!ocfs2_mount_local(osb)) | |
2867 | ocfs2_cluster_unlock(osb, lockres, | |
2868 | ex ? LKM_EXMODE : LKM_PRMODE); | |
2869 | } | |
2870 | ||
4882abeb GH |
2871 | int ocfs2_trim_fs_lock(struct ocfs2_super *osb, |
2872 | struct ocfs2_trim_fs_info *info, int trylock) | |
2873 | { | |
2874 | int status; | |
2875 | struct ocfs2_trim_fs_lvb *lvb; | |
2876 | struct ocfs2_lock_res *lockres = &osb->osb_trim_fs_lockres; | |
2877 | ||
2878 | if (info) | |
2879 | info->tf_valid = 0; | |
2880 | ||
2881 | if (ocfs2_is_hard_readonly(osb)) | |
2882 | return -EROFS; | |
2883 | ||
2884 | if (ocfs2_mount_local(osb)) | |
2885 | return 0; | |
2886 | ||
2887 | status = ocfs2_cluster_lock(osb, lockres, DLM_LOCK_EX, | |
2888 | trylock ? DLM_LKF_NOQUEUE : 0, 0); | |
2889 | if (status < 0) { | |
2890 | if (status != -EAGAIN) | |
2891 | mlog_errno(status); | |
2892 | return status; | |
2893 | } | |
2894 | ||
2895 | if (info) { | |
2896 | lvb = ocfs2_dlm_lvb(&lockres->l_lksb); | |
2897 | if (ocfs2_dlm_lvb_valid(&lockres->l_lksb) && | |
2898 | lvb->lvb_version == OCFS2_TRIMFS_LVB_VERSION) { | |
2899 | info->tf_valid = 1; | |
2900 | info->tf_success = lvb->lvb_success; | |
2901 | info->tf_nodenum = be32_to_cpu(lvb->lvb_nodenum); | |
2902 | info->tf_start = be64_to_cpu(lvb->lvb_start); | |
2903 | info->tf_len = be64_to_cpu(lvb->lvb_len); | |
2904 | info->tf_minlen = be64_to_cpu(lvb->lvb_minlen); | |
2905 | info->tf_trimlen = be64_to_cpu(lvb->lvb_trimlen); | |
2906 | } | |
2907 | } | |
2908 | ||
2909 | return status; | |
2910 | } | |
2911 | ||
2912 | void ocfs2_trim_fs_unlock(struct ocfs2_super *osb, | |
2913 | struct ocfs2_trim_fs_info *info) | |
2914 | { | |
2915 | struct ocfs2_trim_fs_lvb *lvb; | |
2916 | struct ocfs2_lock_res *lockres = &osb->osb_trim_fs_lockres; | |
2917 | ||
2918 | if (ocfs2_mount_local(osb)) | |
2919 | return; | |
2920 | ||
2921 | if (info) { | |
2922 | lvb = ocfs2_dlm_lvb(&lockres->l_lksb); | |
2923 | lvb->lvb_version = OCFS2_TRIMFS_LVB_VERSION; | |
2924 | lvb->lvb_success = info->tf_success; | |
2925 | lvb->lvb_nodenum = cpu_to_be32(info->tf_nodenum); | |
2926 | lvb->lvb_start = cpu_to_be64(info->tf_start); | |
2927 | lvb->lvb_len = cpu_to_be64(info->tf_len); | |
2928 | lvb->lvb_minlen = cpu_to_be64(info->tf_minlen); | |
2929 | lvb->lvb_trimlen = cpu_to_be64(info->tf_trimlen); | |
2930 | } | |
2931 | ||
2932 | ocfs2_cluster_unlock(osb, lockres, DLM_LOCK_EX); | |
2933 | } | |
2934 | ||
d680efe9 MF |
2935 | int ocfs2_dentry_lock(struct dentry *dentry, int ex) |
2936 | { | |
2937 | int ret; | |
bd3e7610 | 2938 | int level = ex ? DLM_LOCK_EX : DLM_LOCK_PR; |
d680efe9 MF |
2939 | struct ocfs2_dentry_lock *dl = dentry->d_fsdata; |
2940 | struct ocfs2_super *osb = OCFS2_SB(dentry->d_sb); | |
2941 | ||
2942 | BUG_ON(!dl); | |
2943 | ||
03efed8a TY |
2944 | if (ocfs2_is_hard_readonly(osb)) { |
2945 | if (ex) | |
2946 | return -EROFS; | |
2947 | return 0; | |
2948 | } | |
d680efe9 | 2949 | |
c271c5c2 SM |
2950 | if (ocfs2_mount_local(osb)) |
2951 | return 0; | |
2952 | ||
d680efe9 MF |
2953 | ret = ocfs2_cluster_lock(osb, &dl->dl_lockres, level, 0, 0); |
2954 | if (ret < 0) | |
2955 | mlog_errno(ret); | |
2956 | ||
2957 | return ret; | |
2958 | } | |
2959 | ||
2960 | void ocfs2_dentry_unlock(struct dentry *dentry, int ex) | |
2961 | { | |
bd3e7610 | 2962 | int level = ex ? DLM_LOCK_EX : DLM_LOCK_PR; |
d680efe9 MF |
2963 | struct ocfs2_dentry_lock *dl = dentry->d_fsdata; |
2964 | struct ocfs2_super *osb = OCFS2_SB(dentry->d_sb); | |
2965 | ||
03efed8a | 2966 | if (!ocfs2_is_hard_readonly(osb) && !ocfs2_mount_local(osb)) |
c271c5c2 | 2967 | ocfs2_cluster_unlock(osb, &dl->dl_lockres, level); |
d680efe9 MF |
2968 | } |
2969 | ||
ccd979bd MF |
2970 | /* Reference counting of the dlm debug structure. We want this because |
2971 | * open references on the debug inodes can live on after a mount, so | |
2972 | * we can't rely on the ocfs2_super to always exist. */ | |
2973 | static void ocfs2_dlm_debug_free(struct kref *kref) | |
2974 | { | |
2975 | struct ocfs2_dlm_debug *dlm_debug; | |
2976 | ||
2977 | dlm_debug = container_of(kref, struct ocfs2_dlm_debug, d_refcnt); | |
2978 | ||
2979 | kfree(dlm_debug); | |
2980 | } | |
2981 | ||
2982 | void ocfs2_put_dlm_debug(struct ocfs2_dlm_debug *dlm_debug) | |
2983 | { | |
2984 | if (dlm_debug) | |
2985 | kref_put(&dlm_debug->d_refcnt, ocfs2_dlm_debug_free); | |
2986 | } | |
2987 | ||
2988 | static void ocfs2_get_dlm_debug(struct ocfs2_dlm_debug *debug) | |
2989 | { | |
2990 | kref_get(&debug->d_refcnt); | |
2991 | } | |
2992 | ||
2993 | struct ocfs2_dlm_debug *ocfs2_new_dlm_debug(void) | |
2994 | { | |
2995 | struct ocfs2_dlm_debug *dlm_debug; | |
2996 | ||
2997 | dlm_debug = kmalloc(sizeof(struct ocfs2_dlm_debug), GFP_KERNEL); | |
2998 | if (!dlm_debug) { | |
2999 | mlog_errno(-ENOMEM); | |
3000 | goto out; | |
3001 | } | |
3002 | ||
3003 | kref_init(&dlm_debug->d_refcnt); | |
3004 | INIT_LIST_HEAD(&dlm_debug->d_lockres_tracking); | |
3005 | dlm_debug->d_locking_state = NULL; | |
3006 | out: | |
3007 | return dlm_debug; | |
3008 | } | |
3009 | ||
3010 | /* Access to this is arbitrated for us via seq_file->sem. */ | |
3011 | struct ocfs2_dlm_seq_priv { | |
3012 | struct ocfs2_dlm_debug *p_dlm_debug; | |
3013 | struct ocfs2_lock_res p_iter_res; | |
3014 | struct ocfs2_lock_res p_tmp_res; | |
3015 | }; | |
3016 | ||
3017 | static struct ocfs2_lock_res *ocfs2_dlm_next_res(struct ocfs2_lock_res *start, | |
3018 | struct ocfs2_dlm_seq_priv *priv) | |
3019 | { | |
3020 | struct ocfs2_lock_res *iter, *ret = NULL; | |
3021 | struct ocfs2_dlm_debug *dlm_debug = priv->p_dlm_debug; | |
3022 | ||
3023 | assert_spin_locked(&ocfs2_dlm_tracking_lock); | |
3024 | ||
3025 | list_for_each_entry(iter, &start->l_debug_list, l_debug_list) { | |
3026 | /* discover the head of the list */ | |
3027 | if (&iter->l_debug_list == &dlm_debug->d_lockres_tracking) { | |
3028 | mlog(0, "End of list found, %p\n", ret); | |
3029 | break; | |
3030 | } | |
3031 | ||
3032 | /* We track our "dummy" iteration lockres' by a NULL | |
3033 | * l_ops field. */ | |
3034 | if (iter->l_ops != NULL) { | |
3035 | ret = iter; | |
3036 | break; | |
3037 | } | |
3038 | } | |
3039 | ||
3040 | return ret; | |
3041 | } | |
3042 | ||
3043 | static void *ocfs2_dlm_seq_start(struct seq_file *m, loff_t *pos) | |
3044 | { | |
3045 | struct ocfs2_dlm_seq_priv *priv = m->private; | |
3046 | struct ocfs2_lock_res *iter; | |
3047 | ||
3048 | spin_lock(&ocfs2_dlm_tracking_lock); | |
3049 | iter = ocfs2_dlm_next_res(&priv->p_iter_res, priv); | |
3050 | if (iter) { | |
3051 | /* Since lockres' have the lifetime of their container | |
3052 | * (which can be inodes, ocfs2_supers, etc) we want to | |
3053 | * copy this out to a temporary lockres while still | |
3054 | * under the spinlock. Obviously after this we can't | |
3055 | * trust any pointers on the copy returned, but that's | |
3056 | * ok as the information we want isn't typically held | |
3057 | * in them. */ | |
3058 | priv->p_tmp_res = *iter; | |
3059 | iter = &priv->p_tmp_res; | |
3060 | } | |
3061 | spin_unlock(&ocfs2_dlm_tracking_lock); | |
3062 | ||
3063 | return iter; | |
3064 | } | |
3065 | ||
3066 | static void ocfs2_dlm_seq_stop(struct seq_file *m, void *v) | |
3067 | { | |
3068 | } | |
3069 | ||
3070 | static void *ocfs2_dlm_seq_next(struct seq_file *m, void *v, loff_t *pos) | |
3071 | { | |
3072 | struct ocfs2_dlm_seq_priv *priv = m->private; | |
3073 | struct ocfs2_lock_res *iter = v; | |
3074 | struct ocfs2_lock_res *dummy = &priv->p_iter_res; | |
3075 | ||
3076 | spin_lock(&ocfs2_dlm_tracking_lock); | |
3077 | iter = ocfs2_dlm_next_res(iter, priv); | |
3078 | list_del_init(&dummy->l_debug_list); | |
3079 | if (iter) { | |
3080 | list_add(&dummy->l_debug_list, &iter->l_debug_list); | |
3081 | priv->p_tmp_res = *iter; | |
3082 | iter = &priv->p_tmp_res; | |
3083 | } | |
3084 | spin_unlock(&ocfs2_dlm_tracking_lock); | |
3085 | ||
3086 | return iter; | |
3087 | } | |
3088 | ||
5bc970e8 SM |
3089 | /* |
3090 | * Version is used by debugfs.ocfs2 to determine the format being used | |
3091 | * | |
3092 | * New in version 2 | |
3093 | * - Lock stats printed | |
3094 | * New in version 3 | |
3095 | * - Max time in lock stats is in usecs (instead of nsecs) | |
3096 | */ | |
3097 | #define OCFS2_DLM_DEBUG_STR_VERSION 3 | |
ccd979bd MF |
3098 | static int ocfs2_dlm_seq_show(struct seq_file *m, void *v) |
3099 | { | |
3100 | int i; | |
3101 | char *lvb; | |
3102 | struct ocfs2_lock_res *lockres = v; | |
3103 | ||
3104 | if (!lockres) | |
3105 | return -EINVAL; | |
3106 | ||
d680efe9 MF |
3107 | seq_printf(m, "0x%x\t", OCFS2_DLM_DEBUG_STR_VERSION); |
3108 | ||
3109 | if (lockres->l_type == OCFS2_LOCK_TYPE_DENTRY) | |
3110 | seq_printf(m, "%.*s%08x\t", OCFS2_DENTRY_LOCK_INO_START - 1, | |
3111 | lockres->l_name, | |
3112 | (unsigned int)ocfs2_get_dentry_lock_ino(lockres)); | |
3113 | else | |
3114 | seq_printf(m, "%.*s\t", OCFS2_LOCK_ID_MAX_LEN, lockres->l_name); | |
3115 | ||
3116 | seq_printf(m, "%d\t" | |
ccd979bd MF |
3117 | "0x%lx\t" |
3118 | "0x%x\t" | |
3119 | "0x%x\t" | |
3120 | "%u\t" | |
3121 | "%u\t" | |
3122 | "%d\t" | |
3123 | "%d\t", | |
ccd979bd MF |
3124 | lockres->l_level, |
3125 | lockres->l_flags, | |
3126 | lockres->l_action, | |
3127 | lockres->l_unlock_action, | |
3128 | lockres->l_ro_holders, | |
3129 | lockres->l_ex_holders, | |
3130 | lockres->l_requested, | |
3131 | lockres->l_blocking); | |
3132 | ||
3133 | /* Dump the raw LVB */ | |
8f2c9c1b | 3134 | lvb = ocfs2_dlm_lvb(&lockres->l_lksb); |
ccd979bd MF |
3135 | for(i = 0; i < DLM_LVB_LEN; i++) |
3136 | seq_printf(m, "0x%x\t", lvb[i]); | |
3137 | ||
8ddb7b00 | 3138 | #ifdef CONFIG_OCFS2_FS_STATS |
5bc970e8 SM |
3139 | # define lock_num_prmode(_l) ((_l)->l_lock_prmode.ls_gets) |
3140 | # define lock_num_exmode(_l) ((_l)->l_lock_exmode.ls_gets) | |
3141 | # define lock_num_prmode_failed(_l) ((_l)->l_lock_prmode.ls_fail) | |
3142 | # define lock_num_exmode_failed(_l) ((_l)->l_lock_exmode.ls_fail) | |
3143 | # define lock_total_prmode(_l) ((_l)->l_lock_prmode.ls_total) | |
3144 | # define lock_total_exmode(_l) ((_l)->l_lock_exmode.ls_total) | |
3145 | # define lock_max_prmode(_l) ((_l)->l_lock_prmode.ls_max) | |
3146 | # define lock_max_exmode(_l) ((_l)->l_lock_exmode.ls_max) | |
3147 | # define lock_refresh(_l) ((_l)->l_lock_refresh) | |
8ddb7b00 | 3148 | #else |
5bc970e8 SM |
3149 | # define lock_num_prmode(_l) (0) |
3150 | # define lock_num_exmode(_l) (0) | |
8ddb7b00 SM |
3151 | # define lock_num_prmode_failed(_l) (0) |
3152 | # define lock_num_exmode_failed(_l) (0) | |
dd25e55e RD |
3153 | # define lock_total_prmode(_l) (0ULL) |
3154 | # define lock_total_exmode(_l) (0ULL) | |
8ddb7b00 SM |
3155 | # define lock_max_prmode(_l) (0) |
3156 | # define lock_max_exmode(_l) (0) | |
3157 | # define lock_refresh(_l) (0) | |
3158 | #endif | |
3159 | /* The following seq_print was added in version 2 of this output */ | |
5bc970e8 SM |
3160 | seq_printf(m, "%u\t" |
3161 | "%u\t" | |
8ddb7b00 SM |
3162 | "%u\t" |
3163 | "%u\t" | |
3164 | "%llu\t" | |
3165 | "%llu\t" | |
3166 | "%u\t" | |
3167 | "%u\t" | |
3168 | "%u\t", | |
3169 | lock_num_prmode(lockres), | |
3170 | lock_num_exmode(lockres), | |
3171 | lock_num_prmode_failed(lockres), | |
3172 | lock_num_exmode_failed(lockres), | |
3173 | lock_total_prmode(lockres), | |
3174 | lock_total_exmode(lockres), | |
3175 | lock_max_prmode(lockres), | |
3176 | lock_max_exmode(lockres), | |
3177 | lock_refresh(lockres)); | |
3178 | ||
ccd979bd MF |
3179 | /* End the line */ |
3180 | seq_printf(m, "\n"); | |
3181 | return 0; | |
3182 | } | |
3183 | ||
90d99779 | 3184 | static const struct seq_operations ocfs2_dlm_seq_ops = { |
ccd979bd MF |
3185 | .start = ocfs2_dlm_seq_start, |
3186 | .stop = ocfs2_dlm_seq_stop, | |
3187 | .next = ocfs2_dlm_seq_next, | |
3188 | .show = ocfs2_dlm_seq_show, | |
3189 | }; | |
3190 | ||
3191 | static int ocfs2_dlm_debug_release(struct inode *inode, struct file *file) | |
3192 | { | |
33fa1d90 | 3193 | struct seq_file *seq = file->private_data; |
ccd979bd MF |
3194 | struct ocfs2_dlm_seq_priv *priv = seq->private; |
3195 | struct ocfs2_lock_res *res = &priv->p_iter_res; | |
3196 | ||
3197 | ocfs2_remove_lockres_tracking(res); | |
3198 | ocfs2_put_dlm_debug(priv->p_dlm_debug); | |
3199 | return seq_release_private(inode, file); | |
3200 | } | |
3201 | ||
3202 | static int ocfs2_dlm_debug_open(struct inode *inode, struct file *file) | |
3203 | { | |
ccd979bd | 3204 | struct ocfs2_dlm_seq_priv *priv; |
ccd979bd MF |
3205 | struct ocfs2_super *osb; |
3206 | ||
1848cb55 | 3207 | priv = __seq_open_private(file, &ocfs2_dlm_seq_ops, sizeof(*priv)); |
ccd979bd | 3208 | if (!priv) { |
1848cb55 RJ |
3209 | mlog_errno(-ENOMEM); |
3210 | return -ENOMEM; | |
ccd979bd | 3211 | } |
1848cb55 | 3212 | |
8e18e294 | 3213 | osb = inode->i_private; |
ccd979bd MF |
3214 | ocfs2_get_dlm_debug(osb->osb_dlm_debug); |
3215 | priv->p_dlm_debug = osb->osb_dlm_debug; | |
3216 | INIT_LIST_HEAD(&priv->p_iter_res.l_debug_list); | |
3217 | ||
ccd979bd MF |
3218 | ocfs2_add_lockres_tracking(&priv->p_iter_res, |
3219 | priv->p_dlm_debug); | |
3220 | ||
1848cb55 | 3221 | return 0; |
ccd979bd MF |
3222 | } |
3223 | ||
4b6f5d20 | 3224 | static const struct file_operations ocfs2_dlm_debug_fops = { |
ccd979bd MF |
3225 | .open = ocfs2_dlm_debug_open, |
3226 | .release = ocfs2_dlm_debug_release, | |
3227 | .read = seq_read, | |
3228 | .llseek = seq_lseek, | |
3229 | }; | |
3230 | ||
3231 | static int ocfs2_dlm_init_debug(struct ocfs2_super *osb) | |
3232 | { | |
3233 | int ret = 0; | |
3234 | struct ocfs2_dlm_debug *dlm_debug = osb->osb_dlm_debug; | |
3235 | ||
3236 | dlm_debug->d_locking_state = debugfs_create_file("locking_state", | |
3237 | S_IFREG|S_IRUSR, | |
3238 | osb->osb_debug_root, | |
3239 | osb, | |
3240 | &ocfs2_dlm_debug_fops); | |
8f443e23 | 3241 | if (!dlm_debug->d_locking_state) { |
ccd979bd MF |
3242 | ret = -EINVAL; |
3243 | mlog(ML_ERROR, | |
3244 | "Unable to create locking state debugfs file.\n"); | |
3245 | goto out; | |
3246 | } | |
3247 | ||
3248 | ocfs2_get_dlm_debug(dlm_debug); | |
3249 | out: | |
3250 | return ret; | |
3251 | } | |
3252 | ||
3253 | static void ocfs2_dlm_shutdown_debug(struct ocfs2_super *osb) | |
3254 | { | |
3255 | struct ocfs2_dlm_debug *dlm_debug = osb->osb_dlm_debug; | |
3256 | ||
3257 | if (dlm_debug) { | |
3258 | debugfs_remove(dlm_debug->d_locking_state); | |
3259 | ocfs2_put_dlm_debug(dlm_debug); | |
3260 | } | |
3261 | } | |
3262 | ||
3263 | int ocfs2_dlm_init(struct ocfs2_super *osb) | |
3264 | { | |
c271c5c2 | 3265 | int status = 0; |
4670c46d | 3266 | struct ocfs2_cluster_connection *conn = NULL; |
ccd979bd | 3267 | |
0abd6d18 MF |
3268 | if (ocfs2_mount_local(osb)) { |
3269 | osb->node_num = 0; | |
c271c5c2 | 3270 | goto local; |
0abd6d18 | 3271 | } |
c271c5c2 | 3272 | |
ccd979bd MF |
3273 | status = ocfs2_dlm_init_debug(osb); |
3274 | if (status < 0) { | |
3275 | mlog_errno(status); | |
3276 | goto bail; | |
3277 | } | |
3278 | ||
34d024f8 | 3279 | /* launch downconvert thread */ |
5afc44e2 JQ |
3280 | osb->dc_task = kthread_run(ocfs2_downconvert_thread, osb, "ocfs2dc-%s", |
3281 | osb->uuid_str); | |
34d024f8 MF |
3282 | if (IS_ERR(osb->dc_task)) { |
3283 | status = PTR_ERR(osb->dc_task); | |
3284 | osb->dc_task = NULL; | |
ccd979bd MF |
3285 | mlog_errno(status); |
3286 | goto bail; | |
3287 | } | |
3288 | ||
ccd979bd | 3289 | /* for now, uuid == domain */ |
9c6c877c | 3290 | status = ocfs2_cluster_connect(osb->osb_cluster_stack, |
c74a3bdd GR |
3291 | osb->osb_cluster_name, |
3292 | strlen(osb->osb_cluster_name), | |
9c6c877c | 3293 | osb->uuid_str, |
4670c46d | 3294 | strlen(osb->uuid_str), |
553b5eb9 | 3295 | &lproto, ocfs2_do_node_down, osb, |
4670c46d JB |
3296 | &conn); |
3297 | if (status) { | |
ccd979bd MF |
3298 | mlog_errno(status); |
3299 | goto bail; | |
3300 | } | |
3301 | ||
3e834151 | 3302 | status = ocfs2_cluster_this_node(conn, &osb->node_num); |
0abd6d18 MF |
3303 | if (status < 0) { |
3304 | mlog_errno(status); | |
3305 | mlog(ML_ERROR, | |
3306 | "could not find this host's node number\n"); | |
286eaa95 | 3307 | ocfs2_cluster_disconnect(conn, 0); |
0abd6d18 MF |
3308 | goto bail; |
3309 | } | |
3310 | ||
c271c5c2 | 3311 | local: |
ccd979bd MF |
3312 | ocfs2_super_lock_res_init(&osb->osb_super_lockres, osb); |
3313 | ocfs2_rename_lock_res_init(&osb->osb_rename_lockres, osb); | |
6ca497a8 | 3314 | ocfs2_nfs_sync_lock_res_init(&osb->osb_nfs_sync_lockres, osb); |
83273932 | 3315 | ocfs2_orphan_scan_lock_res_init(&osb->osb_orphan_scan.os_lockres, osb); |
ccd979bd | 3316 | |
4670c46d | 3317 | osb->cconn = conn; |
ccd979bd MF |
3318 | bail: |
3319 | if (status < 0) { | |
3320 | ocfs2_dlm_shutdown_debug(osb); | |
34d024f8 MF |
3321 | if (osb->dc_task) |
3322 | kthread_stop(osb->dc_task); | |
ccd979bd MF |
3323 | } |
3324 | ||
ccd979bd MF |
3325 | return status; |
3326 | } | |
3327 | ||
286eaa95 JB |
3328 | void ocfs2_dlm_shutdown(struct ocfs2_super *osb, |
3329 | int hangup_pending) | |
ccd979bd | 3330 | { |
ccd979bd MF |
3331 | ocfs2_drop_osb_locks(osb); |
3332 | ||
4670c46d JB |
3333 | /* |
3334 | * Now that we have dropped all locks and ocfs2_dismount_volume() | |
3335 | * has disabled recovery, the DLM won't be talking to us. It's | |
3336 | * safe to tear things down before disconnecting the cluster. | |
3337 | */ | |
3338 | ||
34d024f8 MF |
3339 | if (osb->dc_task) { |
3340 | kthread_stop(osb->dc_task); | |
3341 | osb->dc_task = NULL; | |
ccd979bd MF |
3342 | } |
3343 | ||
3344 | ocfs2_lock_res_free(&osb->osb_super_lockres); | |
3345 | ocfs2_lock_res_free(&osb->osb_rename_lockres); | |
6ca497a8 | 3346 | ocfs2_lock_res_free(&osb->osb_nfs_sync_lockres); |
83273932 | 3347 | ocfs2_lock_res_free(&osb->osb_orphan_scan.os_lockres); |
ccd979bd | 3348 | |
286eaa95 | 3349 | ocfs2_cluster_disconnect(osb->cconn, hangup_pending); |
4670c46d | 3350 | osb->cconn = NULL; |
ccd979bd MF |
3351 | |
3352 | ocfs2_dlm_shutdown_debug(osb); | |
ccd979bd MF |
3353 | } |
3354 | ||
ccd979bd | 3355 | static int ocfs2_drop_lock(struct ocfs2_super *osb, |
0d5dc6c2 | 3356 | struct ocfs2_lock_res *lockres) |
ccd979bd | 3357 | { |
7431cd7e | 3358 | int ret; |
ccd979bd | 3359 | unsigned long flags; |
bd3e7610 | 3360 | u32 lkm_flags = 0; |
ccd979bd MF |
3361 | |
3362 | /* We didn't get anywhere near actually using this lockres. */ | |
3363 | if (!(lockres->l_flags & OCFS2_LOCK_INITIALIZED)) | |
3364 | goto out; | |
3365 | ||
b80fc012 | 3366 | if (lockres->l_ops->flags & LOCK_TYPE_USES_LVB) |
bd3e7610 | 3367 | lkm_flags |= DLM_LKF_VALBLK; |
b80fc012 | 3368 | |
ccd979bd MF |
3369 | spin_lock_irqsave(&lockres->l_lock, flags); |
3370 | ||
3371 | mlog_bug_on_msg(!(lockres->l_flags & OCFS2_LOCK_FREEING), | |
3372 | "lockres %s, flags 0x%lx\n", | |
3373 | lockres->l_name, lockres->l_flags); | |
3374 | ||
3375 | while (lockres->l_flags & OCFS2_LOCK_BUSY) { | |
3376 | mlog(0, "waiting on busy lock \"%s\": flags = %lx, action = " | |
3377 | "%u, unlock_action = %u\n", | |
3378 | lockres->l_name, lockres->l_flags, lockres->l_action, | |
3379 | lockres->l_unlock_action); | |
3380 | ||
3381 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
3382 | ||
3383 | /* XXX: Today we just wait on any busy | |
3384 | * locks... Perhaps we need to cancel converts in the | |
3385 | * future? */ | |
3386 | ocfs2_wait_on_busy_lock(lockres); | |
3387 | ||
3388 | spin_lock_irqsave(&lockres->l_lock, flags); | |
3389 | } | |
3390 | ||
0d5dc6c2 MF |
3391 | if (lockres->l_ops->flags & LOCK_TYPE_USES_LVB) { |
3392 | if (lockres->l_flags & OCFS2_LOCK_ATTACHED && | |
bd3e7610 | 3393 | lockres->l_level == DLM_LOCK_EX && |
0d5dc6c2 MF |
3394 | !(lockres->l_flags & OCFS2_LOCK_NEEDS_REFRESH)) |
3395 | lockres->l_ops->set_lvb(lockres); | |
3396 | } | |
ccd979bd MF |
3397 | |
3398 | if (lockres->l_flags & OCFS2_LOCK_BUSY) | |
3399 | mlog(ML_ERROR, "destroying busy lock: \"%s\"\n", | |
3400 | lockres->l_name); | |
3401 | if (lockres->l_flags & OCFS2_LOCK_BLOCKED) | |
3402 | mlog(0, "destroying blocked lock: \"%s\"\n", lockres->l_name); | |
3403 | ||
3404 | if (!(lockres->l_flags & OCFS2_LOCK_ATTACHED)) { | |
3405 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
3406 | goto out; | |
3407 | } | |
3408 | ||
3409 | lockres_clear_flags(lockres, OCFS2_LOCK_ATTACHED); | |
3410 | ||
3411 | /* make sure we never get here while waiting for an ast to | |
3412 | * fire. */ | |
3413 | BUG_ON(lockres->l_action != OCFS2_AST_INVALID); | |
3414 | ||
3415 | /* is this necessary? */ | |
3416 | lockres_or_flags(lockres, OCFS2_LOCK_BUSY); | |
3417 | lockres->l_unlock_action = OCFS2_UNLOCK_DROP_LOCK; | |
3418 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
3419 | ||
3420 | mlog(0, "lock %s\n", lockres->l_name); | |
3421 | ||
a796d286 | 3422 | ret = ocfs2_dlm_unlock(osb->cconn, &lockres->l_lksb, lkm_flags); |
7431cd7e JB |
3423 | if (ret) { |
3424 | ocfs2_log_dlm_error("ocfs2_dlm_unlock", ret, lockres); | |
ccd979bd | 3425 | mlog(ML_ERROR, "lockres flags: %lu\n", lockres->l_flags); |
cf0acdcd | 3426 | ocfs2_dlm_dump_lksb(&lockres->l_lksb); |
ccd979bd MF |
3427 | BUG(); |
3428 | } | |
73ac36ea | 3429 | mlog(0, "lock %s, successful return from ocfs2_dlm_unlock\n", |
ccd979bd MF |
3430 | lockres->l_name); |
3431 | ||
3432 | ocfs2_wait_on_busy_lock(lockres); | |
3433 | out: | |
ccd979bd MF |
3434 | return 0; |
3435 | } | |
3436 | ||
84d86f83 JK |
3437 | static void ocfs2_process_blocked_lock(struct ocfs2_super *osb, |
3438 | struct ocfs2_lock_res *lockres); | |
3439 | ||
ccd979bd MF |
3440 | /* Mark the lockres as being dropped. It will no longer be |
3441 | * queued if blocking, but we still may have to wait on it | |
34d024f8 | 3442 | * being dequeued from the downconvert thread before we can consider |
2bd63216 | 3443 | * it safe to drop. |
ccd979bd MF |
3444 | * |
3445 | * You can *not* attempt to call cluster_lock on this lockres anymore. */ | |
84d86f83 JK |
3446 | void ocfs2_mark_lockres_freeing(struct ocfs2_super *osb, |
3447 | struct ocfs2_lock_res *lockres) | |
ccd979bd MF |
3448 | { |
3449 | int status; | |
3450 | struct ocfs2_mask_waiter mw; | |
84d86f83 | 3451 | unsigned long flags, flags2; |
ccd979bd MF |
3452 | |
3453 | ocfs2_init_mask_waiter(&mw); | |
3454 | ||
3455 | spin_lock_irqsave(&lockres->l_lock, flags); | |
3456 | lockres->l_flags |= OCFS2_LOCK_FREEING; | |
84d86f83 JK |
3457 | if (lockres->l_flags & OCFS2_LOCK_QUEUED && current == osb->dc_task) { |
3458 | /* | |
3459 | * We know the downconvert is queued but not in progress | |
3460 | * because we are the downconvert thread and processing | |
3461 | * different lock. So we can just remove the lock from the | |
3462 | * queue. This is not only an optimization but also a way | |
3463 | * to avoid the following deadlock: | |
3464 | * ocfs2_dentry_post_unlock() | |
3465 | * ocfs2_dentry_lock_put() | |
3466 | * ocfs2_drop_dentry_lock() | |
3467 | * iput() | |
3468 | * ocfs2_evict_inode() | |
3469 | * ocfs2_clear_inode() | |
3470 | * ocfs2_mark_lockres_freeing() | |
3471 | * ... blocks waiting for OCFS2_LOCK_QUEUED | |
3472 | * since we are the downconvert thread which | |
3473 | * should clear the flag. | |
3474 | */ | |
3475 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
3476 | spin_lock_irqsave(&osb->dc_task_lock, flags2); | |
3477 | list_del_init(&lockres->l_blocked_list); | |
3478 | osb->blocked_lock_count--; | |
3479 | spin_unlock_irqrestore(&osb->dc_task_lock, flags2); | |
3480 | /* | |
3481 | * Warn if we recurse into another post_unlock call. Strictly | |
3482 | * speaking it isn't a problem but we need to be careful if | |
3483 | * that happens (stack overflow, deadlocks, ...) so warn if | |
3484 | * ocfs2 grows a path for which this can happen. | |
3485 | */ | |
3486 | WARN_ON_ONCE(lockres->l_ops->post_unlock); | |
3487 | /* Since the lock is freeing we don't do much in the fn below */ | |
3488 | ocfs2_process_blocked_lock(osb, lockres); | |
3489 | return; | |
3490 | } | |
ccd979bd MF |
3491 | while (lockres->l_flags & OCFS2_LOCK_QUEUED) { |
3492 | lockres_add_mask_waiter(lockres, &mw, OCFS2_LOCK_QUEUED, 0); | |
3493 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
3494 | ||
3495 | mlog(0, "Waiting on lockres %s\n", lockres->l_name); | |
3496 | ||
3497 | status = ocfs2_wait_for_mask(&mw); | |
3498 | if (status) | |
3499 | mlog_errno(status); | |
3500 | ||
3501 | spin_lock_irqsave(&lockres->l_lock, flags); | |
3502 | } | |
3503 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
3504 | } | |
3505 | ||
d680efe9 MF |
3506 | void ocfs2_simple_drop_lockres(struct ocfs2_super *osb, |
3507 | struct ocfs2_lock_res *lockres) | |
ccd979bd | 3508 | { |
d680efe9 | 3509 | int ret; |
ccd979bd | 3510 | |
84d86f83 | 3511 | ocfs2_mark_lockres_freeing(osb, lockres); |
0d5dc6c2 | 3512 | ret = ocfs2_drop_lock(osb, lockres); |
d680efe9 MF |
3513 | if (ret) |
3514 | mlog_errno(ret); | |
3515 | } | |
ccd979bd | 3516 | |
d680efe9 MF |
3517 | static void ocfs2_drop_osb_locks(struct ocfs2_super *osb) |
3518 | { | |
3519 | ocfs2_simple_drop_lockres(osb, &osb->osb_super_lockres); | |
3520 | ocfs2_simple_drop_lockres(osb, &osb->osb_rename_lockres); | |
6ca497a8 | 3521 | ocfs2_simple_drop_lockres(osb, &osb->osb_nfs_sync_lockres); |
83273932 | 3522 | ocfs2_simple_drop_lockres(osb, &osb->osb_orphan_scan.os_lockres); |
ccd979bd MF |
3523 | } |
3524 | ||
ccd979bd MF |
3525 | int ocfs2_drop_inode_locks(struct inode *inode) |
3526 | { | |
3527 | int status, err; | |
ccd979bd | 3528 | |
ccd979bd MF |
3529 | /* No need to call ocfs2_mark_lockres_freeing here - |
3530 | * ocfs2_clear_inode has done it for us. */ | |
3531 | ||
3532 | err = ocfs2_drop_lock(OCFS2_SB(inode->i_sb), | |
50008630 | 3533 | &OCFS2_I(inode)->ip_open_lockres); |
ccd979bd MF |
3534 | if (err < 0) |
3535 | mlog_errno(err); | |
3536 | ||
3537 | status = err; | |
3538 | ||
3539 | err = ocfs2_drop_lock(OCFS2_SB(inode->i_sb), | |
e63aecb6 | 3540 | &OCFS2_I(inode)->ip_inode_lockres); |
ccd979bd MF |
3541 | if (err < 0) |
3542 | mlog_errno(err); | |
3543 | if (err < 0 && !status) | |
3544 | status = err; | |
3545 | ||
3546 | err = ocfs2_drop_lock(OCFS2_SB(inode->i_sb), | |
0d5dc6c2 | 3547 | &OCFS2_I(inode)->ip_rw_lockres); |
ccd979bd MF |
3548 | if (err < 0) |
3549 | mlog_errno(err); | |
3550 | if (err < 0 && !status) | |
3551 | status = err; | |
3552 | ||
ccd979bd MF |
3553 | return status; |
3554 | } | |
3555 | ||
de551246 JB |
3556 | static unsigned int ocfs2_prepare_downconvert(struct ocfs2_lock_res *lockres, |
3557 | int new_level) | |
ccd979bd MF |
3558 | { |
3559 | assert_spin_locked(&lockres->l_lock); | |
3560 | ||
bd3e7610 | 3561 | BUG_ON(lockres->l_blocking <= DLM_LOCK_NL); |
ccd979bd MF |
3562 | |
3563 | if (lockres->l_level <= new_level) { | |
9b915181 SM |
3564 | mlog(ML_ERROR, "lockres %s, lvl %d <= %d, blcklst %d, mask %d, " |
3565 | "type %d, flags 0x%lx, hold %d %d, act %d %d, req %d, " | |
3566 | "block %d, pgen %d\n", lockres->l_name, lockres->l_level, | |
3567 | new_level, list_empty(&lockres->l_blocked_list), | |
3568 | list_empty(&lockres->l_mask_waiters), lockres->l_type, | |
3569 | lockres->l_flags, lockres->l_ro_holders, | |
3570 | lockres->l_ex_holders, lockres->l_action, | |
3571 | lockres->l_unlock_action, lockres->l_requested, | |
3572 | lockres->l_blocking, lockres->l_pending_gen); | |
ccd979bd MF |
3573 | BUG(); |
3574 | } | |
3575 | ||
9b915181 SM |
3576 | mlog(ML_BASTS, "lockres %s, level %d => %d, blocking %d\n", |
3577 | lockres->l_name, lockres->l_level, new_level, lockres->l_blocking); | |
ccd979bd MF |
3578 | |
3579 | lockres->l_action = OCFS2_AST_DOWNCONVERT; | |
3580 | lockres->l_requested = new_level; | |
3581 | lockres_or_flags(lockres, OCFS2_LOCK_BUSY); | |
de551246 | 3582 | return lockres_set_pending(lockres); |
ccd979bd MF |
3583 | } |
3584 | ||
3585 | static int ocfs2_downconvert_lock(struct ocfs2_super *osb, | |
3586 | struct ocfs2_lock_res *lockres, | |
3587 | int new_level, | |
de551246 JB |
3588 | int lvb, |
3589 | unsigned int generation) | |
ccd979bd | 3590 | { |
bd3e7610 JB |
3591 | int ret; |
3592 | u32 dlm_flags = DLM_LKF_CONVERT; | |
ccd979bd | 3593 | |
9b915181 SM |
3594 | mlog(ML_BASTS, "lockres %s, level %d => %d\n", lockres->l_name, |
3595 | lockres->l_level, new_level); | |
3596 | ||
e7ee2c08 ER |
3597 | /* |
3598 | * On DLM_LKF_VALBLK, fsdlm behaves differently with o2cb. It always | |
3599 | * expects DLM_LKF_VALBLK being set if the LKB has LVB, so that | |
3600 | * we can recover correctly from node failure. Otherwise, we may get | |
793057e1 | 3601 | * invalid LVB in LKB, but without DLM_SBF_VALNOTVALID being set. |
e7ee2c08 | 3602 | */ |
a6346447 | 3603 | if (ocfs2_userspace_stack(osb) && |
e7ee2c08 ER |
3604 | lockres->l_ops->flags & LOCK_TYPE_USES_LVB) |
3605 | lvb = 1; | |
3606 | ||
ccd979bd | 3607 | if (lvb) |
bd3e7610 | 3608 | dlm_flags |= DLM_LKF_VALBLK; |
ccd979bd | 3609 | |
4670c46d | 3610 | ret = ocfs2_dlm_lock(osb->cconn, |
7431cd7e JB |
3611 | new_level, |
3612 | &lockres->l_lksb, | |
3613 | dlm_flags, | |
3614 | lockres->l_name, | |
a796d286 | 3615 | OCFS2_LOCK_ID_MAX_LEN - 1); |
de551246 | 3616 | lockres_clear_pending(lockres, generation, osb); |
7431cd7e JB |
3617 | if (ret) { |
3618 | ocfs2_log_dlm_error("ocfs2_dlm_lock", ret, lockres); | |
ccd979bd MF |
3619 | ocfs2_recover_from_dlm_error(lockres, 1); |
3620 | goto bail; | |
3621 | } | |
3622 | ||
3623 | ret = 0; | |
3624 | bail: | |
ccd979bd MF |
3625 | return ret; |
3626 | } | |
3627 | ||
24ef1815 | 3628 | /* returns 1 when the caller should unlock and call ocfs2_dlm_unlock */ |
ccd979bd MF |
3629 | static int ocfs2_prepare_cancel_convert(struct ocfs2_super *osb, |
3630 | struct ocfs2_lock_res *lockres) | |
3631 | { | |
3632 | assert_spin_locked(&lockres->l_lock); | |
3633 | ||
ccd979bd MF |
3634 | if (lockres->l_unlock_action == OCFS2_UNLOCK_CANCEL_CONVERT) { |
3635 | /* If we're already trying to cancel a lock conversion | |
3636 | * then just drop the spinlock and allow the caller to | |
3637 | * requeue this lock. */ | |
9b915181 | 3638 | mlog(ML_BASTS, "lockres %s, skip convert\n", lockres->l_name); |
ccd979bd MF |
3639 | return 0; |
3640 | } | |
3641 | ||
3642 | /* were we in a convert when we got the bast fire? */ | |
3643 | BUG_ON(lockres->l_action != OCFS2_AST_CONVERT && | |
3644 | lockres->l_action != OCFS2_AST_DOWNCONVERT); | |
3645 | /* set things up for the unlockast to know to just | |
3646 | * clear out the ast_action and unset busy, etc. */ | |
3647 | lockres->l_unlock_action = OCFS2_UNLOCK_CANCEL_CONVERT; | |
3648 | ||
3649 | mlog_bug_on_msg(!(lockres->l_flags & OCFS2_LOCK_BUSY), | |
3650 | "lock %s, invalid flags: 0x%lx\n", | |
3651 | lockres->l_name, lockres->l_flags); | |
3652 | ||
9b915181 SM |
3653 | mlog(ML_BASTS, "lockres %s\n", lockres->l_name); |
3654 | ||
ccd979bd MF |
3655 | return 1; |
3656 | } | |
3657 | ||
3658 | static int ocfs2_cancel_convert(struct ocfs2_super *osb, | |
3659 | struct ocfs2_lock_res *lockres) | |
3660 | { | |
3661 | int ret; | |
ccd979bd | 3662 | |
4670c46d | 3663 | ret = ocfs2_dlm_unlock(osb->cconn, &lockres->l_lksb, |
a796d286 | 3664 | DLM_LKF_CANCEL); |
7431cd7e JB |
3665 | if (ret) { |
3666 | ocfs2_log_dlm_error("ocfs2_dlm_unlock", ret, lockres); | |
ccd979bd MF |
3667 | ocfs2_recover_from_dlm_error(lockres, 0); |
3668 | } | |
3669 | ||
9b915181 | 3670 | mlog(ML_BASTS, "lockres %s\n", lockres->l_name); |
ccd979bd | 3671 | |
ccd979bd MF |
3672 | return ret; |
3673 | } | |
3674 | ||
b5e500e2 MF |
3675 | static int ocfs2_unblock_lock(struct ocfs2_super *osb, |
3676 | struct ocfs2_lock_res *lockres, | |
3677 | struct ocfs2_unblock_ctl *ctl) | |
ccd979bd MF |
3678 | { |
3679 | unsigned long flags; | |
3680 | int blocking; | |
3681 | int new_level; | |
079b8057 | 3682 | int level; |
ccd979bd | 3683 | int ret = 0; |
5ef0d4ea | 3684 | int set_lvb = 0; |
de551246 | 3685 | unsigned int gen; |
ccd979bd | 3686 | |
ccd979bd MF |
3687 | spin_lock_irqsave(&lockres->l_lock, flags); |
3688 | ||
ccd979bd | 3689 | recheck: |
db0f6ce6 SM |
3690 | /* |
3691 | * Is it still blocking? If not, we have no more work to do. | |
3692 | */ | |
3693 | if (!(lockres->l_flags & OCFS2_LOCK_BLOCKED)) { | |
3694 | BUG_ON(lockres->l_blocking != DLM_LOCK_NL); | |
3695 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
3696 | ret = 0; | |
3697 | goto leave; | |
3698 | } | |
3699 | ||
ccd979bd | 3700 | if (lockres->l_flags & OCFS2_LOCK_BUSY) { |
de551246 JB |
3701 | /* XXX |
3702 | * This is a *big* race. The OCFS2_LOCK_PENDING flag | |
3703 | * exists entirely for one reason - another thread has set | |
3704 | * OCFS2_LOCK_BUSY, but has *NOT* yet called dlm_lock(). | |
3705 | * | |
3706 | * If we do ocfs2_cancel_convert() before the other thread | |
3707 | * calls dlm_lock(), our cancel will do nothing. We will | |
3708 | * get no ast, and we will have no way of knowing the | |
3709 | * cancel failed. Meanwhile, the other thread will call | |
3710 | * into dlm_lock() and wait...forever. | |
3711 | * | |
3712 | * Why forever? Because another node has asked for the | |
3713 | * lock first; that's why we're here in unblock_lock(). | |
3714 | * | |
3715 | * The solution is OCFS2_LOCK_PENDING. When PENDING is | |
3716 | * set, we just requeue the unblock. Only when the other | |
3717 | * thread has called dlm_lock() and cleared PENDING will | |
3718 | * we then cancel their request. | |
3719 | * | |
3720 | * All callers of dlm_lock() must set OCFS2_DLM_PENDING | |
3721 | * at the same time they set OCFS2_DLM_BUSY. They must | |
3722 | * clear OCFS2_DLM_PENDING after dlm_lock() returns. | |
3723 | */ | |
9b915181 SM |
3724 | if (lockres->l_flags & OCFS2_LOCK_PENDING) { |
3725 | mlog(ML_BASTS, "lockres %s, ReQ: Pending\n", | |
3726 | lockres->l_name); | |
de551246 | 3727 | goto leave_requeue; |
9b915181 | 3728 | } |
de551246 | 3729 | |
d680efe9 | 3730 | ctl->requeue = 1; |
ccd979bd MF |
3731 | ret = ocfs2_prepare_cancel_convert(osb, lockres); |
3732 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
3733 | if (ret) { | |
3734 | ret = ocfs2_cancel_convert(osb, lockres); | |
3735 | if (ret < 0) | |
3736 | mlog_errno(ret); | |
3737 | } | |
3738 | goto leave; | |
3739 | } | |
3740 | ||
a1912826 SM |
3741 | /* |
3742 | * This prevents livelocks. OCFS2_LOCK_UPCONVERT_FINISHING flag is | |
3743 | * set when the ast is received for an upconvert just before the | |
3744 | * OCFS2_LOCK_BUSY flag is cleared. Now if the fs received a bast | |
3745 | * on the heels of the ast, we want to delay the downconvert just | |
3746 | * enough to allow the up requestor to do its task. Because this | |
3747 | * lock is in the blocked queue, the lock will be downconverted | |
3748 | * as soon as the requestor is done with the lock. | |
3749 | */ | |
3750 | if (lockres->l_flags & OCFS2_LOCK_UPCONVERT_FINISHING) | |
3751 | goto leave_requeue; | |
3752 | ||
0d74125a SM |
3753 | /* |
3754 | * How can we block and yet be at NL? We were trying to upconvert | |
3755 | * from NL and got canceled. The code comes back here, and now | |
3756 | * we notice and clear BLOCKING. | |
3757 | */ | |
3758 | if (lockres->l_level == DLM_LOCK_NL) { | |
3759 | BUG_ON(lockres->l_ex_holders || lockres->l_ro_holders); | |
9b915181 | 3760 | mlog(ML_BASTS, "lockres %s, Aborting dc\n", lockres->l_name); |
0d74125a SM |
3761 | lockres->l_blocking = DLM_LOCK_NL; |
3762 | lockres_clear_flags(lockres, OCFS2_LOCK_BLOCKED); | |
3763 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
3764 | goto leave; | |
3765 | } | |
3766 | ||
ccd979bd MF |
3767 | /* if we're blocking an exclusive and we have *any* holders, |
3768 | * then requeue. */ | |
bd3e7610 | 3769 | if ((lockres->l_blocking == DLM_LOCK_EX) |
9b915181 SM |
3770 | && (lockres->l_ex_holders || lockres->l_ro_holders)) { |
3771 | mlog(ML_BASTS, "lockres %s, ReQ: EX/PR Holders %u,%u\n", | |
3772 | lockres->l_name, lockres->l_ex_holders, | |
3773 | lockres->l_ro_holders); | |
f7fbfdd1 | 3774 | goto leave_requeue; |
9b915181 | 3775 | } |
ccd979bd MF |
3776 | |
3777 | /* If it's a PR we're blocking, then only | |
3778 | * requeue if we've got any EX holders */ | |
bd3e7610 | 3779 | if (lockres->l_blocking == DLM_LOCK_PR && |
9b915181 SM |
3780 | lockres->l_ex_holders) { |
3781 | mlog(ML_BASTS, "lockres %s, ReQ: EX Holders %u\n", | |
3782 | lockres->l_name, lockres->l_ex_holders); | |
f7fbfdd1 | 3783 | goto leave_requeue; |
9b915181 | 3784 | } |
f7fbfdd1 MF |
3785 | |
3786 | /* | |
3787 | * Can we get a lock in this state if the holder counts are | |
3788 | * zero? The meta data unblock code used to check this. | |
3789 | */ | |
3790 | if ((lockres->l_ops->flags & LOCK_TYPE_REQUIRES_REFRESH) | |
9b915181 SM |
3791 | && (lockres->l_flags & OCFS2_LOCK_REFRESHING)) { |
3792 | mlog(ML_BASTS, "lockres %s, ReQ: Lock Refreshing\n", | |
3793 | lockres->l_name); | |
f7fbfdd1 | 3794 | goto leave_requeue; |
9b915181 | 3795 | } |
ccd979bd | 3796 | |
16d5b956 MF |
3797 | new_level = ocfs2_highest_compat_lock_level(lockres->l_blocking); |
3798 | ||
3799 | if (lockres->l_ops->check_downconvert | |
9b915181 SM |
3800 | && !lockres->l_ops->check_downconvert(lockres, new_level)) { |
3801 | mlog(ML_BASTS, "lockres %s, ReQ: Checkpointing\n", | |
3802 | lockres->l_name); | |
16d5b956 | 3803 | goto leave_requeue; |
9b915181 | 3804 | } |
16d5b956 | 3805 | |
ccd979bd MF |
3806 | /* If we get here, then we know that there are no more |
3807 | * incompatible holders (and anyone asking for an incompatible | |
3808 | * lock is blocked). We can now downconvert the lock */ | |
cc567d89 | 3809 | if (!lockres->l_ops->downconvert_worker) |
ccd979bd MF |
3810 | goto downconvert; |
3811 | ||
3812 | /* Some lockres types want to do a bit of work before | |
3813 | * downconverting a lock. Allow that here. The worker function | |
3814 | * may sleep, so we save off a copy of what we're blocking as | |
3815 | * it may change while we're not holding the spin lock. */ | |
3816 | blocking = lockres->l_blocking; | |
079b8057 | 3817 | level = lockres->l_level; |
ccd979bd MF |
3818 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
3819 | ||
cc567d89 | 3820 | ctl->unblock_action = lockres->l_ops->downconvert_worker(lockres, blocking); |
d680efe9 | 3821 | |
9b915181 SM |
3822 | if (ctl->unblock_action == UNBLOCK_STOP_POST) { |
3823 | mlog(ML_BASTS, "lockres %s, UNBLOCK_STOP_POST\n", | |
3824 | lockres->l_name); | |
d680efe9 | 3825 | goto leave; |
9b915181 | 3826 | } |
ccd979bd MF |
3827 | |
3828 | spin_lock_irqsave(&lockres->l_lock, flags); | |
079b8057 | 3829 | if ((blocking != lockres->l_blocking) || (level != lockres->l_level)) { |
ccd979bd MF |
3830 | /* If this changed underneath us, then we can't drop |
3831 | * it just yet. */ | |
9b915181 SM |
3832 | mlog(ML_BASTS, "lockres %s, block=%d:%d, level=%d:%d, " |
3833 | "Recheck\n", lockres->l_name, blocking, | |
3834 | lockres->l_blocking, level, lockres->l_level); | |
ccd979bd MF |
3835 | goto recheck; |
3836 | } | |
3837 | ||
3838 | downconvert: | |
d680efe9 | 3839 | ctl->requeue = 0; |
ccd979bd | 3840 | |
5ef0d4ea | 3841 | if (lockres->l_ops->flags & LOCK_TYPE_USES_LVB) { |
bd3e7610 | 3842 | if (lockres->l_level == DLM_LOCK_EX) |
5ef0d4ea MF |
3843 | set_lvb = 1; |
3844 | ||
3845 | /* | |
3846 | * We only set the lvb if the lock has been fully | |
3847 | * refreshed - otherwise we risk setting stale | |
3848 | * data. Otherwise, there's no need to actually clear | |
3849 | * out the lvb here as it's value is still valid. | |
3850 | */ | |
3851 | if (set_lvb && !(lockres->l_flags & OCFS2_LOCK_NEEDS_REFRESH)) | |
3852 | lockres->l_ops->set_lvb(lockres); | |
3853 | } | |
3854 | ||
de551246 | 3855 | gen = ocfs2_prepare_downconvert(lockres, new_level); |
ccd979bd | 3856 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
de551246 JB |
3857 | ret = ocfs2_downconvert_lock(osb, lockres, new_level, set_lvb, |
3858 | gen); | |
3859 | ||
ccd979bd | 3860 | leave: |
c1e8d35e TM |
3861 | if (ret) |
3862 | mlog_errno(ret); | |
ccd979bd | 3863 | return ret; |
f7fbfdd1 MF |
3864 | |
3865 | leave_requeue: | |
3866 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
3867 | ctl->requeue = 1; | |
3868 | ||
f7fbfdd1 | 3869 | return 0; |
ccd979bd MF |
3870 | } |
3871 | ||
d680efe9 MF |
3872 | static int ocfs2_data_convert_worker(struct ocfs2_lock_res *lockres, |
3873 | int blocking) | |
ccd979bd MF |
3874 | { |
3875 | struct inode *inode; | |
3876 | struct address_space *mapping; | |
5e98d492 | 3877 | struct ocfs2_inode_info *oi; |
ccd979bd | 3878 | |
ccd979bd MF |
3879 | inode = ocfs2_lock_res_inode(lockres); |
3880 | mapping = inode->i_mapping; | |
3881 | ||
5e98d492 GR |
3882 | if (S_ISDIR(inode->i_mode)) { |
3883 | oi = OCFS2_I(inode); | |
3884 | oi->ip_dir_lock_gen++; | |
3885 | mlog(0, "generation: %u\n", oi->ip_dir_lock_gen); | |
3886 | goto out; | |
3887 | } | |
3888 | ||
1044e401 | 3889 | if (!S_ISREG(inode->i_mode)) |
f1f54068 MF |
3890 | goto out; |
3891 | ||
7f4a2a97 MF |
3892 | /* |
3893 | * We need this before the filemap_fdatawrite() so that it can | |
3894 | * transfer the dirty bit from the PTE to the | |
3895 | * page. Unfortunately this means that even for EX->PR | |
3896 | * downconverts, we'll lose our mappings and have to build | |
3897 | * them up again. | |
3898 | */ | |
3899 | unmap_mapping_range(mapping, 0, 0, 0); | |
3900 | ||
ccd979bd | 3901 | if (filemap_fdatawrite(mapping)) { |
b0697053 MF |
3902 | mlog(ML_ERROR, "Could not sync inode %llu for downconvert!", |
3903 | (unsigned long long)OCFS2_I(inode)->ip_blkno); | |
ccd979bd MF |
3904 | } |
3905 | sync_mapping_buffers(mapping); | |
bd3e7610 | 3906 | if (blocking == DLM_LOCK_EX) { |
ccd979bd | 3907 | truncate_inode_pages(mapping, 0); |
ccd979bd MF |
3908 | } else { |
3909 | /* We only need to wait on the I/O if we're not also | |
3910 | * truncating pages because truncate_inode_pages waits | |
3911 | * for us above. We don't truncate pages if we're | |
3912 | * blocking anything < EXMODE because we want to keep | |
3913 | * them around in that case. */ | |
3914 | filemap_fdatawait(mapping); | |
3915 | } | |
3916 | ||
b8a7a3a6 AG |
3917 | forget_all_cached_acls(inode); |
3918 | ||
f1f54068 | 3919 | out: |
d680efe9 | 3920 | return UNBLOCK_CONTINUE; |
ccd979bd MF |
3921 | } |
3922 | ||
a4338481 TM |
3923 | static int ocfs2_ci_checkpointed(struct ocfs2_caching_info *ci, |
3924 | struct ocfs2_lock_res *lockres, | |
3925 | int new_level) | |
810d5aeb | 3926 | { |
a4338481 | 3927 | int checkpointed = ocfs2_ci_fully_checkpointed(ci); |
810d5aeb | 3928 | |
bd3e7610 JB |
3929 | BUG_ON(new_level != DLM_LOCK_NL && new_level != DLM_LOCK_PR); |
3930 | BUG_ON(lockres->l_level != DLM_LOCK_EX && !checkpointed); | |
810d5aeb MF |
3931 | |
3932 | if (checkpointed) | |
3933 | return 1; | |
3934 | ||
a4338481 | 3935 | ocfs2_start_checkpoint(OCFS2_SB(ocfs2_metadata_cache_get_super(ci))); |
810d5aeb MF |
3936 | return 0; |
3937 | } | |
3938 | ||
a4338481 TM |
3939 | static int ocfs2_check_meta_downconvert(struct ocfs2_lock_res *lockres, |
3940 | int new_level) | |
3941 | { | |
3942 | struct inode *inode = ocfs2_lock_res_inode(lockres); | |
3943 | ||
3944 | return ocfs2_ci_checkpointed(INODE_CACHE(inode), lockres, new_level); | |
3945 | } | |
3946 | ||
810d5aeb MF |
3947 | static void ocfs2_set_meta_lvb(struct ocfs2_lock_res *lockres) |
3948 | { | |
3949 | struct inode *inode = ocfs2_lock_res_inode(lockres); | |
3950 | ||
3951 | __ocfs2_stuff_meta_lvb(inode); | |
3952 | } | |
3953 | ||
d680efe9 MF |
3954 | /* |
3955 | * Does the final reference drop on our dentry lock. Right now this | |
34d024f8 | 3956 | * happens in the downconvert thread, but we could choose to simplify the |
d680efe9 MF |
3957 | * dlmglue API and push these off to the ocfs2_wq in the future. |
3958 | */ | |
3959 | static void ocfs2_dentry_post_unlock(struct ocfs2_super *osb, | |
3960 | struct ocfs2_lock_res *lockres) | |
3961 | { | |
3962 | struct ocfs2_dentry_lock *dl = ocfs2_lock_res_dl(lockres); | |
3963 | ocfs2_dentry_lock_put(osb, dl); | |
3964 | } | |
3965 | ||
3966 | /* | |
3967 | * d_delete() matching dentries before the lock downconvert. | |
3968 | * | |
3969 | * At this point, any process waiting to destroy the | |
3970 | * dentry_lock due to last ref count is stopped by the | |
3971 | * OCFS2_LOCK_QUEUED flag. | |
3972 | * | |
3973 | * We have two potential problems | |
3974 | * | |
3975 | * 1) If we do the last reference drop on our dentry_lock (via dput) | |
3976 | * we'll wind up in ocfs2_release_dentry_lock(), waiting on | |
3977 | * the downconvert to finish. Instead we take an elevated | |
3978 | * reference and push the drop until after we've completed our | |
3979 | * unblock processing. | |
3980 | * | |
3981 | * 2) There might be another process with a final reference, | |
3982 | * waiting on us to finish processing. If this is the case, we | |
3983 | * detect it and exit out - there's no more dentries anyway. | |
3984 | */ | |
3985 | static int ocfs2_dentry_convert_worker(struct ocfs2_lock_res *lockres, | |
3986 | int blocking) | |
3987 | { | |
3988 | struct ocfs2_dentry_lock *dl = ocfs2_lock_res_dl(lockres); | |
3989 | struct ocfs2_inode_info *oi = OCFS2_I(dl->dl_inode); | |
3990 | struct dentry *dentry; | |
3991 | unsigned long flags; | |
3992 | int extra_ref = 0; | |
3993 | ||
3994 | /* | |
3995 | * This node is blocking another node from getting a read | |
3996 | * lock. This happens when we've renamed within a | |
3997 | * directory. We've forced the other nodes to d_delete(), but | |
3998 | * we never actually dropped our lock because it's still | |
3999 | * valid. The downconvert code will retain a PR for this node, | |
4000 | * so there's no further work to do. | |
4001 | */ | |
bd3e7610 | 4002 | if (blocking == DLM_LOCK_PR) |
d680efe9 MF |
4003 | return UNBLOCK_CONTINUE; |
4004 | ||
4005 | /* | |
4006 | * Mark this inode as potentially orphaned. The code in | |
4007 | * ocfs2_delete_inode() will figure out whether it actually | |
4008 | * needs to be freed or not. | |
4009 | */ | |
4010 | spin_lock(&oi->ip_lock); | |
4011 | oi->ip_flags |= OCFS2_INODE_MAYBE_ORPHANED; | |
4012 | spin_unlock(&oi->ip_lock); | |
4013 | ||
4014 | /* | |
4015 | * Yuck. We need to make sure however that the check of | |
4016 | * OCFS2_LOCK_FREEING and the extra reference are atomic with | |
4017 | * respect to a reference decrement or the setting of that | |
4018 | * flag. | |
4019 | */ | |
4020 | spin_lock_irqsave(&lockres->l_lock, flags); | |
4021 | spin_lock(&dentry_attach_lock); | |
4022 | if (!(lockres->l_flags & OCFS2_LOCK_FREEING) | |
4023 | && dl->dl_count) { | |
4024 | dl->dl_count++; | |
4025 | extra_ref = 1; | |
4026 | } | |
4027 | spin_unlock(&dentry_attach_lock); | |
4028 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
4029 | ||
4030 | mlog(0, "extra_ref = %d\n", extra_ref); | |
4031 | ||
4032 | /* | |
4033 | * We have a process waiting on us in ocfs2_dentry_iput(), | |
4034 | * which means we can't have any more outstanding | |
4035 | * aliases. There's no need to do any more work. | |
4036 | */ | |
4037 | if (!extra_ref) | |
4038 | return UNBLOCK_CONTINUE; | |
4039 | ||
4040 | spin_lock(&dentry_attach_lock); | |
4041 | while (1) { | |
4042 | dentry = ocfs2_find_local_alias(dl->dl_inode, | |
4043 | dl->dl_parent_blkno, 1); | |
4044 | if (!dentry) | |
4045 | break; | |
4046 | spin_unlock(&dentry_attach_lock); | |
4047 | ||
10ab8811 | 4048 | if (S_ISDIR(dl->dl_inode->i_mode)) |
4049 | shrink_dcache_parent(dentry); | |
4050 | ||
a455589f | 4051 | mlog(0, "d_delete(%pd);\n", dentry); |
d680efe9 MF |
4052 | |
4053 | /* | |
4054 | * The following dcache calls may do an | |
4055 | * iput(). Normally we don't want that from the | |
4056 | * downconverting thread, but in this case it's ok | |
4057 | * because the requesting node already has an | |
4058 | * exclusive lock on the inode, so it can't be queued | |
4059 | * for a downconvert. | |
4060 | */ | |
4061 | d_delete(dentry); | |
4062 | dput(dentry); | |
4063 | ||
4064 | spin_lock(&dentry_attach_lock); | |
4065 | } | |
4066 | spin_unlock(&dentry_attach_lock); | |
4067 | ||
4068 | /* | |
4069 | * If we are the last holder of this dentry lock, there is no | |
4070 | * reason to downconvert so skip straight to the unlock. | |
4071 | */ | |
4072 | if (dl->dl_count == 1) | |
4073 | return UNBLOCK_STOP_POST; | |
4074 | ||
4075 | return UNBLOCK_CONTINUE_POST; | |
4076 | } | |
4077 | ||
8dec98ed TM |
4078 | static int ocfs2_check_refcount_downconvert(struct ocfs2_lock_res *lockres, |
4079 | int new_level) | |
4080 | { | |
4081 | struct ocfs2_refcount_tree *tree = | |
4082 | ocfs2_lock_res_refcount_tree(lockres); | |
4083 | ||
4084 | return ocfs2_ci_checkpointed(&tree->rf_ci, lockres, new_level); | |
4085 | } | |
4086 | ||
4087 | static int ocfs2_refcount_convert_worker(struct ocfs2_lock_res *lockres, | |
4088 | int blocking) | |
4089 | { | |
4090 | struct ocfs2_refcount_tree *tree = | |
4091 | ocfs2_lock_res_refcount_tree(lockres); | |
4092 | ||
4093 | ocfs2_metadata_cache_purge(&tree->rf_ci); | |
4094 | ||
4095 | return UNBLOCK_CONTINUE; | |
4096 | } | |
4097 | ||
9e33d69f JK |
4098 | static void ocfs2_set_qinfo_lvb(struct ocfs2_lock_res *lockres) |
4099 | { | |
4100 | struct ocfs2_qinfo_lvb *lvb; | |
4101 | struct ocfs2_mem_dqinfo *oinfo = ocfs2_lock_res_qinfo(lockres); | |
4102 | struct mem_dqinfo *info = sb_dqinfo(oinfo->dqi_gi.dqi_sb, | |
4103 | oinfo->dqi_gi.dqi_type); | |
4104 | ||
a641dc2a | 4105 | lvb = ocfs2_dlm_lvb(&lockres->l_lksb); |
9e33d69f JK |
4106 | lvb->lvb_version = OCFS2_QINFO_LVB_VERSION; |
4107 | lvb->lvb_bgrace = cpu_to_be32(info->dqi_bgrace); | |
4108 | lvb->lvb_igrace = cpu_to_be32(info->dqi_igrace); | |
4109 | lvb->lvb_syncms = cpu_to_be32(oinfo->dqi_syncms); | |
4110 | lvb->lvb_blocks = cpu_to_be32(oinfo->dqi_gi.dqi_blocks); | |
4111 | lvb->lvb_free_blk = cpu_to_be32(oinfo->dqi_gi.dqi_free_blk); | |
4112 | lvb->lvb_free_entry = cpu_to_be32(oinfo->dqi_gi.dqi_free_entry); | |
9e33d69f JK |
4113 | } |
4114 | ||
4115 | void ocfs2_qinfo_unlock(struct ocfs2_mem_dqinfo *oinfo, int ex) | |
4116 | { | |
4117 | struct ocfs2_lock_res *lockres = &oinfo->dqi_gqlock; | |
4118 | struct ocfs2_super *osb = OCFS2_SB(oinfo->dqi_gi.dqi_sb); | |
4119 | int level = ex ? DLM_LOCK_EX : DLM_LOCK_PR; | |
4120 | ||
9e33d69f JK |
4121 | if (!ocfs2_is_hard_readonly(osb) && !ocfs2_mount_local(osb)) |
4122 | ocfs2_cluster_unlock(osb, lockres, level); | |
9e33d69f JK |
4123 | } |
4124 | ||
4125 | static int ocfs2_refresh_qinfo(struct ocfs2_mem_dqinfo *oinfo) | |
4126 | { | |
4127 | struct mem_dqinfo *info = sb_dqinfo(oinfo->dqi_gi.dqi_sb, | |
4128 | oinfo->dqi_gi.dqi_type); | |
4129 | struct ocfs2_lock_res *lockres = &oinfo->dqi_gqlock; | |
4130 | struct ocfs2_qinfo_lvb *lvb = ocfs2_dlm_lvb(&lockres->l_lksb); | |
85eb8b73 | 4131 | struct buffer_head *bh = NULL; |
9e33d69f JK |
4132 | struct ocfs2_global_disk_dqinfo *gdinfo; |
4133 | int status = 0; | |
4134 | ||
1c520dfb JB |
4135 | if (ocfs2_dlm_lvb_valid(&lockres->l_lksb) && |
4136 | lvb->lvb_version == OCFS2_QINFO_LVB_VERSION) { | |
9e33d69f JK |
4137 | info->dqi_bgrace = be32_to_cpu(lvb->lvb_bgrace); |
4138 | info->dqi_igrace = be32_to_cpu(lvb->lvb_igrace); | |
4139 | oinfo->dqi_syncms = be32_to_cpu(lvb->lvb_syncms); | |
4140 | oinfo->dqi_gi.dqi_blocks = be32_to_cpu(lvb->lvb_blocks); | |
4141 | oinfo->dqi_gi.dqi_free_blk = be32_to_cpu(lvb->lvb_free_blk); | |
4142 | oinfo->dqi_gi.dqi_free_entry = | |
4143 | be32_to_cpu(lvb->lvb_free_entry); | |
4144 | } else { | |
ae4f6ef1 JK |
4145 | status = ocfs2_read_quota_phys_block(oinfo->dqi_gqinode, |
4146 | oinfo->dqi_giblk, &bh); | |
85eb8b73 | 4147 | if (status) { |
9e33d69f JK |
4148 | mlog_errno(status); |
4149 | goto bail; | |
4150 | } | |
4151 | gdinfo = (struct ocfs2_global_disk_dqinfo *) | |
4152 | (bh->b_data + OCFS2_GLOBAL_INFO_OFF); | |
4153 | info->dqi_bgrace = le32_to_cpu(gdinfo->dqi_bgrace); | |
4154 | info->dqi_igrace = le32_to_cpu(gdinfo->dqi_igrace); | |
4155 | oinfo->dqi_syncms = le32_to_cpu(gdinfo->dqi_syncms); | |
4156 | oinfo->dqi_gi.dqi_blocks = le32_to_cpu(gdinfo->dqi_blocks); | |
4157 | oinfo->dqi_gi.dqi_free_blk = le32_to_cpu(gdinfo->dqi_free_blk); | |
4158 | oinfo->dqi_gi.dqi_free_entry = | |
4159 | le32_to_cpu(gdinfo->dqi_free_entry); | |
4160 | brelse(bh); | |
4161 | ocfs2_track_lock_refresh(lockres); | |
4162 | } | |
4163 | ||
4164 | bail: | |
4165 | return status; | |
4166 | } | |
4167 | ||
4168 | /* Lock quota info, this function expects at least shared lock on the quota file | |
4169 | * so that we can safely refresh quota info from disk. */ | |
4170 | int ocfs2_qinfo_lock(struct ocfs2_mem_dqinfo *oinfo, int ex) | |
4171 | { | |
4172 | struct ocfs2_lock_res *lockres = &oinfo->dqi_gqlock; | |
4173 | struct ocfs2_super *osb = OCFS2_SB(oinfo->dqi_gi.dqi_sb); | |
4174 | int level = ex ? DLM_LOCK_EX : DLM_LOCK_PR; | |
4175 | int status = 0; | |
4176 | ||
9e33d69f JK |
4177 | /* On RO devices, locking really isn't needed... */ |
4178 | if (ocfs2_is_hard_readonly(osb)) { | |
4179 | if (ex) | |
4180 | status = -EROFS; | |
4181 | goto bail; | |
4182 | } | |
4183 | if (ocfs2_mount_local(osb)) | |
4184 | goto bail; | |
4185 | ||
4186 | status = ocfs2_cluster_lock(osb, lockres, level, 0, 0); | |
4187 | if (status < 0) { | |
4188 | mlog_errno(status); | |
4189 | goto bail; | |
4190 | } | |
4191 | if (!ocfs2_should_refresh_lock_res(lockres)) | |
4192 | goto bail; | |
4193 | /* OK, we have the lock but we need to refresh the quota info */ | |
4194 | status = ocfs2_refresh_qinfo(oinfo); | |
4195 | if (status) | |
4196 | ocfs2_qinfo_unlock(oinfo, ex); | |
4197 | ocfs2_complete_lock_res_refresh(lockres, status); | |
4198 | bail: | |
9e33d69f JK |
4199 | return status; |
4200 | } | |
4201 | ||
8dec98ed TM |
4202 | int ocfs2_refcount_lock(struct ocfs2_refcount_tree *ref_tree, int ex) |
4203 | { | |
4204 | int status; | |
4205 | int level = ex ? DLM_LOCK_EX : DLM_LOCK_PR; | |
4206 | struct ocfs2_lock_res *lockres = &ref_tree->rf_lockres; | |
4207 | struct ocfs2_super *osb = lockres->l_priv; | |
4208 | ||
4209 | ||
4210 | if (ocfs2_is_hard_readonly(osb)) | |
4211 | return -EROFS; | |
4212 | ||
4213 | if (ocfs2_mount_local(osb)) | |
4214 | return 0; | |
4215 | ||
4216 | status = ocfs2_cluster_lock(osb, lockres, level, 0, 0); | |
4217 | if (status < 0) | |
4218 | mlog_errno(status); | |
4219 | ||
4220 | return status; | |
4221 | } | |
4222 | ||
4223 | void ocfs2_refcount_unlock(struct ocfs2_refcount_tree *ref_tree, int ex) | |
4224 | { | |
4225 | int level = ex ? DLM_LOCK_EX : DLM_LOCK_PR; | |
4226 | struct ocfs2_lock_res *lockres = &ref_tree->rf_lockres; | |
4227 | struct ocfs2_super *osb = lockres->l_priv; | |
4228 | ||
4229 | if (!ocfs2_mount_local(osb)) | |
4230 | ocfs2_cluster_unlock(osb, lockres, level); | |
4231 | } | |
4232 | ||
00600056 AB |
4233 | static void ocfs2_process_blocked_lock(struct ocfs2_super *osb, |
4234 | struct ocfs2_lock_res *lockres) | |
ccd979bd MF |
4235 | { |
4236 | int status; | |
d680efe9 | 4237 | struct ocfs2_unblock_ctl ctl = {0, 0,}; |
ccd979bd MF |
4238 | unsigned long flags; |
4239 | ||
4240 | /* Our reference to the lockres in this function can be | |
4241 | * considered valid until we remove the OCFS2_LOCK_QUEUED | |
4242 | * flag. */ | |
4243 | ||
ccd979bd MF |
4244 | BUG_ON(!lockres); |
4245 | BUG_ON(!lockres->l_ops); | |
ccd979bd | 4246 | |
9b915181 | 4247 | mlog(ML_BASTS, "lockres %s blocked\n", lockres->l_name); |
ccd979bd MF |
4248 | |
4249 | /* Detect whether a lock has been marked as going away while | |
34d024f8 | 4250 | * the downconvert thread was processing other things. A lock can |
ccd979bd MF |
4251 | * still be marked with OCFS2_LOCK_FREEING after this check, |
4252 | * but short circuiting here will still save us some | |
4253 | * performance. */ | |
4254 | spin_lock_irqsave(&lockres->l_lock, flags); | |
4255 | if (lockres->l_flags & OCFS2_LOCK_FREEING) | |
4256 | goto unqueue; | |
4257 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
4258 | ||
b5e500e2 | 4259 | status = ocfs2_unblock_lock(osb, lockres, &ctl); |
ccd979bd MF |
4260 | if (status < 0) |
4261 | mlog_errno(status); | |
4262 | ||
4263 | spin_lock_irqsave(&lockres->l_lock, flags); | |
4264 | unqueue: | |
d680efe9 | 4265 | if (lockres->l_flags & OCFS2_LOCK_FREEING || !ctl.requeue) { |
ccd979bd MF |
4266 | lockres_clear_flags(lockres, OCFS2_LOCK_QUEUED); |
4267 | } else | |
4268 | ocfs2_schedule_blocked_lock(osb, lockres); | |
4269 | ||
9b915181 | 4270 | mlog(ML_BASTS, "lockres %s, requeue = %s.\n", lockres->l_name, |
d680efe9 | 4271 | ctl.requeue ? "yes" : "no"); |
ccd979bd MF |
4272 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
4273 | ||
d680efe9 MF |
4274 | if (ctl.unblock_action != UNBLOCK_CONTINUE |
4275 | && lockres->l_ops->post_unlock) | |
4276 | lockres->l_ops->post_unlock(osb, lockres); | |
ccd979bd MF |
4277 | } |
4278 | ||
4279 | static void ocfs2_schedule_blocked_lock(struct ocfs2_super *osb, | |
4280 | struct ocfs2_lock_res *lockres) | |
4281 | { | |
a75e9cca SE |
4282 | unsigned long flags; |
4283 | ||
ccd979bd MF |
4284 | assert_spin_locked(&lockres->l_lock); |
4285 | ||
4286 | if (lockres->l_flags & OCFS2_LOCK_FREEING) { | |
4287 | /* Do not schedule a lock for downconvert when it's on | |
4288 | * the way to destruction - any nodes wanting access | |
4289 | * to the resource will get it soon. */ | |
9b915181 | 4290 | mlog(ML_BASTS, "lockres %s won't be scheduled: flags 0x%lx\n", |
ccd979bd MF |
4291 | lockres->l_name, lockres->l_flags); |
4292 | return; | |
4293 | } | |
4294 | ||
4295 | lockres_or_flags(lockres, OCFS2_LOCK_QUEUED); | |
4296 | ||
a75e9cca | 4297 | spin_lock_irqsave(&osb->dc_task_lock, flags); |
ccd979bd MF |
4298 | if (list_empty(&lockres->l_blocked_list)) { |
4299 | list_add_tail(&lockres->l_blocked_list, | |
4300 | &osb->blocked_lock_list); | |
4301 | osb->blocked_lock_count++; | |
4302 | } | |
a75e9cca | 4303 | spin_unlock_irqrestore(&osb->dc_task_lock, flags); |
ccd979bd | 4304 | } |
34d024f8 MF |
4305 | |
4306 | static void ocfs2_downconvert_thread_do_work(struct ocfs2_super *osb) | |
4307 | { | |
4308 | unsigned long processed; | |
a75e9cca | 4309 | unsigned long flags; |
34d024f8 MF |
4310 | struct ocfs2_lock_res *lockres; |
4311 | ||
a75e9cca | 4312 | spin_lock_irqsave(&osb->dc_task_lock, flags); |
34d024f8 MF |
4313 | /* grab this early so we know to try again if a state change and |
4314 | * wake happens part-way through our work */ | |
4315 | osb->dc_work_sequence = osb->dc_wake_sequence; | |
4316 | ||
4317 | processed = osb->blocked_lock_count; | |
209f7512 JQ |
4318 | /* |
4319 | * blocked lock processing in this loop might call iput which can | |
4320 | * remove items off osb->blocked_lock_list. Downconvert up to | |
4321 | * 'processed' number of locks, but stop short if we had some | |
4322 | * removed in ocfs2_mark_lockres_freeing when downconverting. | |
4323 | */ | |
4324 | while (processed && !list_empty(&osb->blocked_lock_list)) { | |
34d024f8 MF |
4325 | lockres = list_entry(osb->blocked_lock_list.next, |
4326 | struct ocfs2_lock_res, l_blocked_list); | |
4327 | list_del_init(&lockres->l_blocked_list); | |
4328 | osb->blocked_lock_count--; | |
a75e9cca | 4329 | spin_unlock_irqrestore(&osb->dc_task_lock, flags); |
34d024f8 MF |
4330 | |
4331 | BUG_ON(!processed); | |
4332 | processed--; | |
4333 | ||
4334 | ocfs2_process_blocked_lock(osb, lockres); | |
4335 | ||
a75e9cca | 4336 | spin_lock_irqsave(&osb->dc_task_lock, flags); |
34d024f8 | 4337 | } |
a75e9cca | 4338 | spin_unlock_irqrestore(&osb->dc_task_lock, flags); |
34d024f8 MF |
4339 | } |
4340 | ||
4341 | static int ocfs2_downconvert_thread_lists_empty(struct ocfs2_super *osb) | |
4342 | { | |
4343 | int empty = 0; | |
a75e9cca | 4344 | unsigned long flags; |
34d024f8 | 4345 | |
a75e9cca | 4346 | spin_lock_irqsave(&osb->dc_task_lock, flags); |
34d024f8 MF |
4347 | if (list_empty(&osb->blocked_lock_list)) |
4348 | empty = 1; | |
4349 | ||
a75e9cca | 4350 | spin_unlock_irqrestore(&osb->dc_task_lock, flags); |
34d024f8 MF |
4351 | return empty; |
4352 | } | |
4353 | ||
4354 | static int ocfs2_downconvert_thread_should_wake(struct ocfs2_super *osb) | |
4355 | { | |
4356 | int should_wake = 0; | |
a75e9cca | 4357 | unsigned long flags; |
34d024f8 | 4358 | |
a75e9cca | 4359 | spin_lock_irqsave(&osb->dc_task_lock, flags); |
34d024f8 MF |
4360 | if (osb->dc_work_sequence != osb->dc_wake_sequence) |
4361 | should_wake = 1; | |
a75e9cca | 4362 | spin_unlock_irqrestore(&osb->dc_task_lock, flags); |
34d024f8 MF |
4363 | |
4364 | return should_wake; | |
4365 | } | |
4366 | ||
200bfae3 | 4367 | static int ocfs2_downconvert_thread(void *arg) |
34d024f8 MF |
4368 | { |
4369 | int status = 0; | |
4370 | struct ocfs2_super *osb = arg; | |
4371 | ||
4372 | /* only quit once we've been asked to stop and there is no more | |
4373 | * work available */ | |
4374 | while (!(kthread_should_stop() && | |
4375 | ocfs2_downconvert_thread_lists_empty(osb))) { | |
4376 | ||
4377 | wait_event_interruptible(osb->dc_event, | |
4378 | ocfs2_downconvert_thread_should_wake(osb) || | |
4379 | kthread_should_stop()); | |
4380 | ||
4381 | mlog(0, "downconvert_thread: awoken\n"); | |
4382 | ||
4383 | ocfs2_downconvert_thread_do_work(osb); | |
4384 | } | |
4385 | ||
4386 | osb->dc_task = NULL; | |
4387 | return status; | |
4388 | } | |
4389 | ||
4390 | void ocfs2_wake_downconvert_thread(struct ocfs2_super *osb) | |
4391 | { | |
a75e9cca SE |
4392 | unsigned long flags; |
4393 | ||
4394 | spin_lock_irqsave(&osb->dc_task_lock, flags); | |
34d024f8 MF |
4395 | /* make sure the voting thread gets a swipe at whatever changes |
4396 | * the caller may have made to the voting state */ | |
4397 | osb->dc_wake_sequence++; | |
a75e9cca | 4398 | spin_unlock_irqrestore(&osb->dc_task_lock, flags); |
34d024f8 MF |
4399 | wake_up(&osb->dc_event); |
4400 | } |