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24ef1815 JB |
1 | /* -*- mode: c; c-basic-offset: 8; -*- |
2 | * vim: noexpandtab sw=8 ts=8 sts=0: | |
3 | * | |
4 | * stackglue.c | |
5 | * | |
6 | * Code which implements an OCFS2 specific interface to underlying | |
7 | * cluster stacks. | |
8 | * | |
9 | * Copyright (C) 2007 Oracle. All rights reserved. | |
10 | * | |
11 | * This program is free software; you can redistribute it and/or | |
12 | * modify it under the terms of the GNU General Public | |
13 | * License as published by the Free Software Foundation, version 2. | |
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 | ||
4670c46d JB |
21 | #include <linux/slab.h> |
22 | #include <linux/crc32.h> | |
23 | ||
24 | /* Needed for AOP_TRUNCATED_PAGE in mlog_errno() */ | |
25 | #include <linux/fs.h> | |
26 | ||
7431cd7e | 27 | #include "cluster/masklog.h" |
19fdb624 JB |
28 | #include "cluster/nodemanager.h" |
29 | ||
24ef1815 JB |
30 | #include "stackglue.h" |
31 | ||
32 | static struct ocfs2_locking_protocol *lproto; | |
33 | ||
4670c46d JB |
34 | struct o2dlm_private { |
35 | struct dlm_eviction_cb op_eviction_cb; | |
36 | }; | |
37 | ||
bd3e7610 JB |
38 | /* These should be identical */ |
39 | #if (DLM_LOCK_IV != LKM_IVMODE) | |
40 | # error Lock modes do not match | |
41 | #endif | |
42 | #if (DLM_LOCK_NL != LKM_NLMODE) | |
43 | # error Lock modes do not match | |
44 | #endif | |
45 | #if (DLM_LOCK_CR != LKM_CRMODE) | |
46 | # error Lock modes do not match | |
47 | #endif | |
48 | #if (DLM_LOCK_CW != LKM_CWMODE) | |
49 | # error Lock modes do not match | |
50 | #endif | |
51 | #if (DLM_LOCK_PR != LKM_PRMODE) | |
52 | # error Lock modes do not match | |
53 | #endif | |
54 | #if (DLM_LOCK_PW != LKM_PWMODE) | |
55 | # error Lock modes do not match | |
56 | #endif | |
57 | #if (DLM_LOCK_EX != LKM_EXMODE) | |
58 | # error Lock modes do not match | |
59 | #endif | |
60 | static inline int mode_to_o2dlm(int mode) | |
61 | { | |
62 | BUG_ON(mode > LKM_MAXMODE); | |
63 | ||
64 | return mode; | |
65 | } | |
66 | ||
67 | #define map_flag(_generic, _o2dlm) \ | |
68 | if (flags & (_generic)) { \ | |
69 | flags &= ~(_generic); \ | |
70 | o2dlm_flags |= (_o2dlm); \ | |
71 | } | |
72 | static int flags_to_o2dlm(u32 flags) | |
73 | { | |
74 | int o2dlm_flags = 0; | |
75 | ||
76 | map_flag(DLM_LKF_NOQUEUE, LKM_NOQUEUE); | |
77 | map_flag(DLM_LKF_CANCEL, LKM_CANCEL); | |
78 | map_flag(DLM_LKF_CONVERT, LKM_CONVERT); | |
79 | map_flag(DLM_LKF_VALBLK, LKM_VALBLK); | |
80 | map_flag(DLM_LKF_IVVALBLK, LKM_INVVALBLK); | |
81 | map_flag(DLM_LKF_ORPHAN, LKM_ORPHAN); | |
82 | map_flag(DLM_LKF_FORCEUNLOCK, LKM_FORCE); | |
83 | map_flag(DLM_LKF_TIMEOUT, LKM_TIMEOUT); | |
84 | map_flag(DLM_LKF_LOCAL, LKM_LOCAL); | |
85 | ||
86 | /* map_flag() should have cleared every flag passed in */ | |
87 | BUG_ON(flags != 0); | |
88 | ||
89 | return o2dlm_flags; | |
90 | } | |
91 | #undef map_flag | |
92 | ||
7431cd7e JB |
93 | /* |
94 | * Map an o2dlm status to standard errno values. | |
95 | * | |
96 | * o2dlm only uses a handful of these, and returns even fewer to the | |
97 | * caller. Still, we try to assign sane values to each error. | |
98 | * | |
99 | * The following value pairs have special meanings to dlmglue, thus | |
100 | * the right hand side needs to stay unique - never duplicate the | |
101 | * mapping elsewhere in the table! | |
102 | * | |
103 | * DLM_NORMAL: 0 | |
104 | * DLM_NOTQUEUED: -EAGAIN | |
105 | * DLM_CANCELGRANT: -DLM_ECANCEL | |
106 | * DLM_CANCEL: -DLM_EUNLOCK | |
107 | */ | |
108 | /* Keep in sync with dlmapi.h */ | |
109 | static int status_map[] = { | |
110 | [DLM_NORMAL] = 0, /* Success */ | |
111 | [DLM_GRANTED] = -EINVAL, | |
112 | [DLM_DENIED] = -EACCES, | |
113 | [DLM_DENIED_NOLOCKS] = -EACCES, | |
114 | [DLM_WORKING] = -EBUSY, | |
115 | [DLM_BLOCKED] = -EINVAL, | |
116 | [DLM_BLOCKED_ORPHAN] = -EINVAL, | |
117 | [DLM_DENIED_GRACE_PERIOD] = -EACCES, | |
118 | [DLM_SYSERR] = -ENOMEM, /* It is what it is */ | |
119 | [DLM_NOSUPPORT] = -EPROTO, | |
120 | [DLM_CANCELGRANT] = -DLM_ECANCEL, /* Cancel after grant */ | |
121 | [DLM_IVLOCKID] = -EINVAL, | |
122 | [DLM_SYNC] = -EINVAL, | |
123 | [DLM_BADTYPE] = -EINVAL, | |
124 | [DLM_BADRESOURCE] = -EINVAL, | |
125 | [DLM_MAXHANDLES] = -ENOMEM, | |
126 | [DLM_NOCLINFO] = -EINVAL, | |
127 | [DLM_NOLOCKMGR] = -EINVAL, | |
128 | [DLM_NOPURGED] = -EINVAL, | |
129 | [DLM_BADARGS] = -EINVAL, | |
130 | [DLM_VOID] = -EINVAL, | |
131 | [DLM_NOTQUEUED] = -EAGAIN, /* Trylock failed */ | |
132 | [DLM_IVBUFLEN] = -EINVAL, | |
133 | [DLM_CVTUNGRANT] = -EPERM, | |
134 | [DLM_BADPARAM] = -EINVAL, | |
135 | [DLM_VALNOTVALID] = -EINVAL, | |
136 | [DLM_REJECTED] = -EPERM, | |
137 | [DLM_ABORT] = -EINVAL, | |
138 | [DLM_CANCEL] = -DLM_EUNLOCK, /* Successful cancel */ | |
139 | [DLM_IVRESHANDLE] = -EINVAL, | |
140 | [DLM_DEADLOCK] = -EDEADLK, | |
141 | [DLM_DENIED_NOASTS] = -EINVAL, | |
142 | [DLM_FORWARD] = -EINVAL, | |
143 | [DLM_TIMEOUT] = -ETIMEDOUT, | |
144 | [DLM_IVGROUPID] = -EINVAL, | |
145 | [DLM_VERS_CONFLICT] = -EOPNOTSUPP, | |
146 | [DLM_BAD_DEVICE_PATH] = -ENOENT, | |
147 | [DLM_NO_DEVICE_PERMISSION] = -EPERM, | |
148 | [DLM_NO_CONTROL_DEVICE] = -ENOENT, | |
149 | [DLM_RECOVERING] = -ENOTCONN, | |
150 | [DLM_MIGRATING] = -ERESTART, | |
151 | [DLM_MAXSTATS] = -EINVAL, | |
152 | }; | |
153 | static int dlm_status_to_errno(enum dlm_status status) | |
154 | { | |
155 | BUG_ON(status > (sizeof(status_map) / sizeof(status_map[0]))); | |
156 | ||
157 | return status_map[status]; | |
158 | } | |
159 | ||
160 | static void o2dlm_lock_ast_wrapper(void *astarg) | |
161 | { | |
162 | BUG_ON(lproto == NULL); | |
163 | ||
164 | lproto->lp_lock_ast(astarg); | |
165 | } | |
166 | ||
167 | static void o2dlm_blocking_ast_wrapper(void *astarg, int level) | |
168 | { | |
169 | BUG_ON(lproto == NULL); | |
170 | ||
171 | lproto->lp_blocking_ast(astarg, level); | |
172 | } | |
173 | ||
174 | static void o2dlm_unlock_ast_wrapper(void *astarg, enum dlm_status status) | |
175 | { | |
176 | int error; | |
177 | ||
178 | BUG_ON(lproto == NULL); | |
179 | ||
180 | /* | |
181 | * XXX: CANCEL values are sketchy. | |
182 | * | |
183 | * Currently we have preserved the o2dlm paradigm. You can get | |
184 | * unlock_ast() whether the cancel succeded or not. | |
185 | * | |
186 | * First, we're going to pass DLM_EUNLOCK just like fs/dlm does for | |
187 | * successful unlocks. That is a clean behavior. | |
188 | * | |
189 | * In o2dlm, you can get both the lock_ast() for the lock being | |
190 | * granted and the unlock_ast() for the CANCEL failing. A | |
191 | * successful cancel sends DLM_NORMAL here. If the | |
192 | * lock grant happened before the cancel arrived, you get | |
193 | * DLM_CANCELGRANT. For now, we'll use DLM_ECANCEL to signify | |
194 | * CANCELGRANT - the CANCEL was supposed to happen but didn't. We | |
195 | * can then use DLM_EUNLOCK to signify a successful CANCEL - | |
196 | * effectively, the CANCEL caused the lock to roll back. | |
197 | * | |
198 | * In the future, we will likely move the o2dlm to send only one | |
199 | * ast - either unlock_ast() for a successful CANCEL or lock_ast() | |
200 | * when the grant succeeds. At that point, we'll send DLM_ECANCEL | |
201 | * for all cancel results (CANCELGRANT will no longer exist). | |
202 | */ | |
203 | error = dlm_status_to_errno(status); | |
204 | ||
205 | /* Successful unlock is DLM_EUNLOCK */ | |
206 | if (!error) | |
207 | error = -DLM_EUNLOCK; | |
208 | ||
209 | lproto->lp_unlock_ast(astarg, error); | |
210 | } | |
211 | ||
4670c46d | 212 | int ocfs2_dlm_lock(struct ocfs2_cluster_connection *conn, |
24ef1815 | 213 | int mode, |
8f2c9c1b | 214 | union ocfs2_dlm_lksb *lksb, |
24ef1815 JB |
215 | u32 flags, |
216 | void *name, | |
217 | unsigned int namelen, | |
218 | void *astarg) | |
219 | { | |
7431cd7e | 220 | enum dlm_status status; |
bd3e7610 JB |
221 | int o2dlm_mode = mode_to_o2dlm(mode); |
222 | int o2dlm_flags = flags_to_o2dlm(flags); | |
7431cd7e | 223 | int ret; |
bd3e7610 | 224 | |
24ef1815 | 225 | BUG_ON(lproto == NULL); |
bd3e7610 | 226 | |
4670c46d JB |
227 | status = dlmlock(conn->cc_lockspace, o2dlm_mode, &lksb->lksb_o2dlm, |
228 | o2dlm_flags, name, namelen, | |
8f2c9c1b JB |
229 | o2dlm_lock_ast_wrapper, astarg, |
230 | o2dlm_blocking_ast_wrapper); | |
7431cd7e JB |
231 | ret = dlm_status_to_errno(status); |
232 | return ret; | |
24ef1815 JB |
233 | } |
234 | ||
4670c46d | 235 | int ocfs2_dlm_unlock(struct ocfs2_cluster_connection *conn, |
8f2c9c1b | 236 | union ocfs2_dlm_lksb *lksb, |
24ef1815 JB |
237 | u32 flags, |
238 | void *astarg) | |
239 | { | |
7431cd7e | 240 | enum dlm_status status; |
bd3e7610 | 241 | int o2dlm_flags = flags_to_o2dlm(flags); |
7431cd7e | 242 | int ret; |
bd3e7610 | 243 | |
24ef1815 JB |
244 | BUG_ON(lproto == NULL); |
245 | ||
4670c46d JB |
246 | status = dlmunlock(conn->cc_lockspace, &lksb->lksb_o2dlm, |
247 | o2dlm_flags, o2dlm_unlock_ast_wrapper, astarg); | |
7431cd7e JB |
248 | ret = dlm_status_to_errno(status); |
249 | return ret; | |
24ef1815 JB |
250 | } |
251 | ||
8f2c9c1b JB |
252 | int ocfs2_dlm_lock_status(union ocfs2_dlm_lksb *lksb) |
253 | { | |
254 | return dlm_status_to_errno(lksb->lksb_o2dlm.status); | |
255 | } | |
256 | ||
257 | /* | |
258 | * Why don't we cast to ocfs2_meta_lvb? The "clean" answer is that we | |
259 | * don't cast at the glue level. The real answer is that the header | |
260 | * ordering is nigh impossible. | |
261 | */ | |
262 | void *ocfs2_dlm_lvb(union ocfs2_dlm_lksb *lksb) | |
263 | { | |
264 | return (void *)(lksb->lksb_o2dlm.lvb); | |
265 | } | |
24ef1815 | 266 | |
4670c46d JB |
267 | /* |
268 | * Called from the dlm when it's about to evict a node. This is how the | |
269 | * classic stack signals node death. | |
270 | */ | |
271 | static void o2dlm_eviction_cb(int node_num, void *data) | |
272 | { | |
273 | struct ocfs2_cluster_connection *conn = data; | |
274 | ||
275 | mlog(ML_NOTICE, "o2dlm has evicted node %d from group %.*s\n", | |
276 | node_num, conn->cc_namelen, conn->cc_name); | |
277 | ||
278 | conn->cc_recovery_handler(node_num, conn->cc_recovery_data); | |
279 | } | |
280 | ||
281 | int ocfs2_cluster_connect(const char *group, | |
282 | int grouplen, | |
283 | void (*recovery_handler)(int node_num, | |
284 | void *recovery_data), | |
285 | void *recovery_data, | |
286 | struct ocfs2_cluster_connection **conn) | |
287 | { | |
288 | int rc = 0; | |
289 | struct ocfs2_cluster_connection *new_conn; | |
290 | u32 dlm_key; | |
291 | struct dlm_ctxt *dlm; | |
292 | struct o2dlm_private *priv; | |
293 | struct dlm_protocol_version dlm_version; | |
294 | ||
295 | BUG_ON(group == NULL); | |
296 | BUG_ON(conn == NULL); | |
297 | BUG_ON(recovery_handler == NULL); | |
298 | ||
299 | if (grouplen > GROUP_NAME_MAX) { | |
300 | rc = -EINVAL; | |
301 | goto out; | |
302 | } | |
303 | ||
304 | new_conn = kzalloc(sizeof(struct ocfs2_cluster_connection), | |
305 | GFP_KERNEL); | |
306 | if (!new_conn) { | |
307 | rc = -ENOMEM; | |
308 | goto out; | |
309 | } | |
310 | ||
311 | memcpy(new_conn->cc_name, group, grouplen); | |
312 | new_conn->cc_namelen = grouplen; | |
313 | new_conn->cc_recovery_handler = recovery_handler; | |
314 | new_conn->cc_recovery_data = recovery_data; | |
315 | ||
316 | /* Start the new connection at our maximum compatibility level */ | |
317 | new_conn->cc_version = lproto->lp_max_version; | |
318 | ||
319 | priv = kzalloc(sizeof(struct o2dlm_private), GFP_KERNEL); | |
320 | if (!priv) { | |
321 | rc = -ENOMEM; | |
322 | goto out_free; | |
323 | } | |
324 | ||
325 | /* This just fills the structure in. It is safe to use new_conn. */ | |
326 | dlm_setup_eviction_cb(&priv->op_eviction_cb, o2dlm_eviction_cb, | |
327 | new_conn); | |
328 | ||
329 | new_conn->cc_private = priv; | |
330 | ||
331 | /* used by the dlm code to make message headers unique, each | |
332 | * node in this domain must agree on this. */ | |
333 | dlm_key = crc32_le(0, group, grouplen); | |
334 | dlm_version.pv_major = new_conn->cc_version.pv_major; | |
335 | dlm_version.pv_minor = new_conn->cc_version.pv_minor; | |
336 | ||
337 | dlm = dlm_register_domain(group, dlm_key, &dlm_version); | |
338 | if (IS_ERR(dlm)) { | |
339 | rc = PTR_ERR(dlm); | |
340 | mlog_errno(rc); | |
341 | goto out_free; | |
342 | } | |
343 | ||
344 | new_conn->cc_version.pv_major = dlm_version.pv_major; | |
345 | new_conn->cc_version.pv_minor = dlm_version.pv_minor; | |
346 | new_conn->cc_lockspace = dlm; | |
347 | ||
348 | dlm_register_eviction_cb(dlm, &priv->op_eviction_cb); | |
349 | ||
350 | *conn = new_conn; | |
351 | ||
352 | out_free: | |
353 | if (rc) { | |
354 | kfree(new_conn->cc_private); | |
355 | kfree(new_conn); | |
356 | } | |
357 | ||
358 | out: | |
359 | return rc; | |
360 | } | |
361 | ||
362 | int ocfs2_cluster_disconnect(struct ocfs2_cluster_connection *conn) | |
363 | { | |
364 | struct dlm_ctxt *dlm = conn->cc_lockspace; | |
365 | struct o2dlm_private *priv = conn->cc_private; | |
366 | ||
367 | dlm_unregister_eviction_cb(&priv->op_eviction_cb); | |
368 | dlm_unregister_domain(dlm); | |
369 | ||
370 | kfree(priv); | |
371 | kfree(conn); | |
372 | ||
373 | return 0; | |
374 | } | |
375 | ||
19fdb624 JB |
376 | int ocfs2_cluster_this_node(unsigned int *node) |
377 | { | |
378 | int node_num; | |
379 | ||
380 | node_num = o2nm_this_node(); | |
381 | if (node_num == O2NM_INVALID_NODE_NUM) | |
382 | return -ENOENT; | |
383 | ||
384 | if (node_num >= O2NM_MAX_NODES) | |
385 | return -EOVERFLOW; | |
386 | ||
387 | *node = node_num; | |
388 | return 0; | |
389 | } | |
390 | ||
24ef1815 JB |
391 | void o2cb_get_stack(struct ocfs2_locking_protocol *proto) |
392 | { | |
393 | BUG_ON(proto == NULL); | |
394 | ||
395 | lproto = proto; | |
396 | } | |
397 | ||
398 | void o2cb_put_stack(void) | |
399 | { | |
400 | lproto = NULL; | |
401 | } |