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e3dad42b JB |
1 | /* -*- mode: c; c-basic-offset: 8; -*- |
2 | * vim: noexpandtab sw=8 ts=8 sts=0: | |
3 | * | |
4 | * stack_o2cb.c | |
5 | * | |
6 | * Code which interfaces ocfs2 with the o2cb stack. | |
7 | * | |
8 | * Copyright (C) 2007 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, version 2. | |
13 | * | |
14 | * This program is distributed in the hope that it will be useful, | |
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
17 | * General Public License for more details. | |
18 | */ | |
19 | ||
8a57a9dd | 20 | #include <linux/kernel.h> |
e3dad42b | 21 | #include <linux/crc32.h> |
5a0e3ad6 | 22 | #include <linux/slab.h> |
286eaa95 | 23 | #include <linux/module.h> |
e3dad42b JB |
24 | |
25 | /* Needed for AOP_TRUNCATED_PAGE in mlog_errno() */ | |
26 | #include <linux/fs.h> | |
27 | ||
28 | #include "cluster/masklog.h" | |
29 | #include "cluster/nodemanager.h" | |
30 | #include "cluster/heartbeat.h" | |
6b27f62f | 31 | #include "cluster/tcp.h" |
e3dad42b JB |
32 | |
33 | #include "stackglue.h" | |
34 | ||
35 | struct o2dlm_private { | |
36 | struct dlm_eviction_cb op_eviction_cb; | |
37 | }; | |
38 | ||
286eaa95 JB |
39 | static struct ocfs2_stack_plugin o2cb_stack; |
40 | ||
e3dad42b JB |
41 | /* These should be identical */ |
42 | #if (DLM_LOCK_IV != LKM_IVMODE) | |
43 | # error Lock modes do not match | |
44 | #endif | |
45 | #if (DLM_LOCK_NL != LKM_NLMODE) | |
46 | # error Lock modes do not match | |
47 | #endif | |
48 | #if (DLM_LOCK_CR != LKM_CRMODE) | |
49 | # error Lock modes do not match | |
50 | #endif | |
51 | #if (DLM_LOCK_CW != LKM_CWMODE) | |
52 | # error Lock modes do not match | |
53 | #endif | |
54 | #if (DLM_LOCK_PR != LKM_PRMODE) | |
55 | # error Lock modes do not match | |
56 | #endif | |
57 | #if (DLM_LOCK_PW != LKM_PWMODE) | |
58 | # error Lock modes do not match | |
59 | #endif | |
60 | #if (DLM_LOCK_EX != LKM_EXMODE) | |
61 | # error Lock modes do not match | |
62 | #endif | |
63 | static inline int mode_to_o2dlm(int mode) | |
64 | { | |
65 | BUG_ON(mode > LKM_MAXMODE); | |
66 | ||
67 | return mode; | |
68 | } | |
69 | ||
70 | #define map_flag(_generic, _o2dlm) \ | |
71 | if (flags & (_generic)) { \ | |
72 | flags &= ~(_generic); \ | |
73 | o2dlm_flags |= (_o2dlm); \ | |
74 | } | |
75 | static int flags_to_o2dlm(u32 flags) | |
76 | { | |
77 | int o2dlm_flags = 0; | |
78 | ||
79 | map_flag(DLM_LKF_NOQUEUE, LKM_NOQUEUE); | |
80 | map_flag(DLM_LKF_CANCEL, LKM_CANCEL); | |
81 | map_flag(DLM_LKF_CONVERT, LKM_CONVERT); | |
82 | map_flag(DLM_LKF_VALBLK, LKM_VALBLK); | |
83 | map_flag(DLM_LKF_IVVALBLK, LKM_INVVALBLK); | |
84 | map_flag(DLM_LKF_ORPHAN, LKM_ORPHAN); | |
85 | map_flag(DLM_LKF_FORCEUNLOCK, LKM_FORCE); | |
86 | map_flag(DLM_LKF_TIMEOUT, LKM_TIMEOUT); | |
87 | map_flag(DLM_LKF_LOCAL, LKM_LOCAL); | |
88 | ||
89 | /* map_flag() should have cleared every flag passed in */ | |
90 | BUG_ON(flags != 0); | |
91 | ||
92 | return o2dlm_flags; | |
93 | } | |
94 | #undef map_flag | |
95 | ||
96 | /* | |
97 | * Map an o2dlm status to standard errno values. | |
98 | * | |
99 | * o2dlm only uses a handful of these, and returns even fewer to the | |
100 | * caller. Still, we try to assign sane values to each error. | |
101 | * | |
102 | * The following value pairs have special meanings to dlmglue, thus | |
103 | * the right hand side needs to stay unique - never duplicate the | |
104 | * mapping elsewhere in the table! | |
105 | * | |
106 | * DLM_NORMAL: 0 | |
107 | * DLM_NOTQUEUED: -EAGAIN | |
108 | * DLM_CANCELGRANT: -EBUSY | |
109 | * DLM_CANCEL: -DLM_ECANCEL | |
110 | */ | |
111 | /* Keep in sync with dlmapi.h */ | |
112 | static int status_map[] = { | |
113 | [DLM_NORMAL] = 0, /* Success */ | |
114 | [DLM_GRANTED] = -EINVAL, | |
115 | [DLM_DENIED] = -EACCES, | |
116 | [DLM_DENIED_NOLOCKS] = -EACCES, | |
117 | [DLM_WORKING] = -EACCES, | |
118 | [DLM_BLOCKED] = -EINVAL, | |
119 | [DLM_BLOCKED_ORPHAN] = -EINVAL, | |
120 | [DLM_DENIED_GRACE_PERIOD] = -EACCES, | |
121 | [DLM_SYSERR] = -ENOMEM, /* It is what it is */ | |
122 | [DLM_NOSUPPORT] = -EPROTO, | |
123 | [DLM_CANCELGRANT] = -EBUSY, /* Cancel after grant */ | |
124 | [DLM_IVLOCKID] = -EINVAL, | |
125 | [DLM_SYNC] = -EINVAL, | |
126 | [DLM_BADTYPE] = -EINVAL, | |
127 | [DLM_BADRESOURCE] = -EINVAL, | |
128 | [DLM_MAXHANDLES] = -ENOMEM, | |
129 | [DLM_NOCLINFO] = -EINVAL, | |
130 | [DLM_NOLOCKMGR] = -EINVAL, | |
131 | [DLM_NOPURGED] = -EINVAL, | |
132 | [DLM_BADARGS] = -EINVAL, | |
133 | [DLM_VOID] = -EINVAL, | |
134 | [DLM_NOTQUEUED] = -EAGAIN, /* Trylock failed */ | |
135 | [DLM_IVBUFLEN] = -EINVAL, | |
136 | [DLM_CVTUNGRANT] = -EPERM, | |
137 | [DLM_BADPARAM] = -EINVAL, | |
138 | [DLM_VALNOTVALID] = -EINVAL, | |
139 | [DLM_REJECTED] = -EPERM, | |
140 | [DLM_ABORT] = -EINVAL, | |
141 | [DLM_CANCEL] = -DLM_ECANCEL, /* Successful cancel */ | |
142 | [DLM_IVRESHANDLE] = -EINVAL, | |
143 | [DLM_DEADLOCK] = -EDEADLK, | |
144 | [DLM_DENIED_NOASTS] = -EINVAL, | |
145 | [DLM_FORWARD] = -EINVAL, | |
146 | [DLM_TIMEOUT] = -ETIMEDOUT, | |
147 | [DLM_IVGROUPID] = -EINVAL, | |
148 | [DLM_VERS_CONFLICT] = -EOPNOTSUPP, | |
149 | [DLM_BAD_DEVICE_PATH] = -ENOENT, | |
150 | [DLM_NO_DEVICE_PERMISSION] = -EPERM, | |
151 | [DLM_NO_CONTROL_DEVICE] = -ENOENT, | |
152 | [DLM_RECOVERING] = -ENOTCONN, | |
153 | [DLM_MIGRATING] = -ERESTART, | |
154 | [DLM_MAXSTATS] = -EINVAL, | |
155 | }; | |
156 | ||
157 | static int dlm_status_to_errno(enum dlm_status status) | |
158 | { | |
8a57a9dd | 159 | BUG_ON(status < 0 || status >= ARRAY_SIZE(status_map)); |
e3dad42b JB |
160 | |
161 | return status_map[status]; | |
162 | } | |
163 | ||
164 | static void o2dlm_lock_ast_wrapper(void *astarg) | |
165 | { | |
c0e41338 | 166 | struct ocfs2_dlm_lksb *lksb = astarg; |
a796d286 | 167 | |
110946c8 | 168 | lksb->lksb_conn->cc_proto->lp_lock_ast(lksb); |
e3dad42b JB |
169 | } |
170 | ||
171 | static void o2dlm_blocking_ast_wrapper(void *astarg, int level) | |
172 | { | |
c0e41338 | 173 | struct ocfs2_dlm_lksb *lksb = astarg; |
a796d286 | 174 | |
110946c8 | 175 | lksb->lksb_conn->cc_proto->lp_blocking_ast(lksb, level); |
e3dad42b JB |
176 | } |
177 | ||
178 | static void o2dlm_unlock_ast_wrapper(void *astarg, enum dlm_status status) | |
179 | { | |
c0e41338 | 180 | struct ocfs2_dlm_lksb *lksb = astarg; |
e3dad42b JB |
181 | int error = dlm_status_to_errno(status); |
182 | ||
e3dad42b JB |
183 | /* |
184 | * In o2dlm, you can get both the lock_ast() for the lock being | |
185 | * granted and the unlock_ast() for the CANCEL failing. A | |
186 | * successful cancel sends DLM_NORMAL here. If the | |
187 | * lock grant happened before the cancel arrived, you get | |
188 | * DLM_CANCELGRANT. | |
189 | * | |
190 | * There's no need for the double-ast. If we see DLM_CANCELGRANT, | |
191 | * we just ignore it. We expect the lock_ast() to handle the | |
192 | * granted lock. | |
193 | */ | |
194 | if (status == DLM_CANCELGRANT) | |
195 | return; | |
196 | ||
110946c8 | 197 | lksb->lksb_conn->cc_proto->lp_unlock_ast(lksb, error); |
e3dad42b JB |
198 | } |
199 | ||
200 | static int o2cb_dlm_lock(struct ocfs2_cluster_connection *conn, | |
201 | int mode, | |
c0e41338 | 202 | struct ocfs2_dlm_lksb *lksb, |
e3dad42b JB |
203 | u32 flags, |
204 | void *name, | |
a796d286 | 205 | unsigned int namelen) |
e3dad42b JB |
206 | { |
207 | enum dlm_status status; | |
208 | int o2dlm_mode = mode_to_o2dlm(mode); | |
209 | int o2dlm_flags = flags_to_o2dlm(flags); | |
210 | int ret; | |
211 | ||
212 | status = dlmlock(conn->cc_lockspace, o2dlm_mode, &lksb->lksb_o2dlm, | |
213 | o2dlm_flags, name, namelen, | |
a796d286 | 214 | o2dlm_lock_ast_wrapper, lksb, |
e3dad42b JB |
215 | o2dlm_blocking_ast_wrapper); |
216 | ret = dlm_status_to_errno(status); | |
217 | return ret; | |
218 | } | |
219 | ||
220 | static int o2cb_dlm_unlock(struct ocfs2_cluster_connection *conn, | |
c0e41338 | 221 | struct ocfs2_dlm_lksb *lksb, |
a796d286 | 222 | u32 flags) |
e3dad42b JB |
223 | { |
224 | enum dlm_status status; | |
225 | int o2dlm_flags = flags_to_o2dlm(flags); | |
226 | int ret; | |
227 | ||
228 | status = dlmunlock(conn->cc_lockspace, &lksb->lksb_o2dlm, | |
a796d286 | 229 | o2dlm_flags, o2dlm_unlock_ast_wrapper, lksb); |
e3dad42b JB |
230 | ret = dlm_status_to_errno(status); |
231 | return ret; | |
232 | } | |
233 | ||
c0e41338 | 234 | static int o2cb_dlm_lock_status(struct ocfs2_dlm_lksb *lksb) |
e3dad42b JB |
235 | { |
236 | return dlm_status_to_errno(lksb->lksb_o2dlm.status); | |
237 | } | |
238 | ||
1c520dfb JB |
239 | /* |
240 | * o2dlm aways has a "valid" LVB. If the dlm loses track of the LVB | |
241 | * contents, it will zero out the LVB. Thus the caller can always trust | |
242 | * the contents. | |
243 | */ | |
c0e41338 | 244 | static int o2cb_dlm_lvb_valid(struct ocfs2_dlm_lksb *lksb) |
1c520dfb JB |
245 | { |
246 | return 1; | |
247 | } | |
248 | ||
c0e41338 | 249 | static void *o2cb_dlm_lvb(struct ocfs2_dlm_lksb *lksb) |
e3dad42b JB |
250 | { |
251 | return (void *)(lksb->lksb_o2dlm.lvb); | |
252 | } | |
253 | ||
c0e41338 | 254 | static void o2cb_dump_lksb(struct ocfs2_dlm_lksb *lksb) |
e3dad42b JB |
255 | { |
256 | dlm_print_one_lock(lksb->lksb_o2dlm.lockid); | |
257 | } | |
258 | ||
6b27f62f SM |
259 | /* |
260 | * Check if this node is heartbeating and is connected to all other | |
261 | * heartbeating nodes. | |
262 | */ | |
263 | static int o2cb_cluster_check(void) | |
264 | { | |
265 | u8 node_num; | |
266 | int i; | |
267 | unsigned long hbmap[BITS_TO_LONGS(O2NM_MAX_NODES)]; | |
268 | unsigned long netmap[BITS_TO_LONGS(O2NM_MAX_NODES)]; | |
269 | ||
270 | node_num = o2nm_this_node(); | |
271 | if (node_num == O2NM_MAX_NODES) { | |
272 | printk(KERN_ERR "o2cb: This node has not been configured.\n"); | |
273 | return -EINVAL; | |
274 | } | |
275 | ||
276 | /* | |
277 | * o2dlm expects o2net sockets to be created. If not, then | |
278 | * dlm_join_domain() fails with a stack of errors which are both cryptic | |
279 | * and incomplete. The idea here is to detect upfront whether we have | |
280 | * managed to connect to all nodes or not. If not, then list the nodes | |
281 | * to allow the user to check the configuration (incorrect IP, firewall, | |
282 | * etc.) Yes, this is racy. But its not the end of the world. | |
283 | */ | |
284 | #define O2CB_MAP_STABILIZE_COUNT 60 | |
285 | for (i = 0; i < O2CB_MAP_STABILIZE_COUNT; ++i) { | |
286 | o2hb_fill_node_map(hbmap, sizeof(hbmap)); | |
287 | if (!test_bit(node_num, hbmap)) { | |
288 | printk(KERN_ERR "o2cb: %s heartbeat has not been " | |
289 | "started.\n", (o2hb_global_heartbeat_active() ? | |
290 | "Global" : "Local")); | |
291 | return -EINVAL; | |
292 | } | |
293 | o2net_fill_node_map(netmap, sizeof(netmap)); | |
294 | /* Force set the current node to allow easy compare */ | |
295 | set_bit(node_num, netmap); | |
296 | if (!memcmp(hbmap, netmap, sizeof(hbmap))) | |
297 | return 0; | |
298 | if (i < O2CB_MAP_STABILIZE_COUNT) | |
299 | msleep(1000); | |
300 | } | |
301 | ||
302 | printk(KERN_ERR "o2cb: This node could not connect to nodes:"); | |
303 | i = -1; | |
304 | while ((i = find_next_bit(hbmap, O2NM_MAX_NODES, | |
305 | i + 1)) < O2NM_MAX_NODES) { | |
306 | if (!test_bit(i, netmap)) | |
307 | printk(" %u", i); | |
308 | } | |
309 | printk(".\n"); | |
310 | ||
311 | return -ENOTCONN; | |
312 | } | |
313 | ||
e3dad42b JB |
314 | /* |
315 | * Called from the dlm when it's about to evict a node. This is how the | |
316 | * classic stack signals node death. | |
317 | */ | |
318 | static void o2dlm_eviction_cb(int node_num, void *data) | |
319 | { | |
320 | struct ocfs2_cluster_connection *conn = data; | |
321 | ||
394eb3d3 SM |
322 | printk(KERN_NOTICE "o2cb: o2dlm has evicted node %d from domain %.*s\n", |
323 | node_num, conn->cc_namelen, conn->cc_name); | |
e3dad42b JB |
324 | |
325 | conn->cc_recovery_handler(node_num, conn->cc_recovery_data); | |
326 | } | |
327 | ||
328 | static int o2cb_cluster_connect(struct ocfs2_cluster_connection *conn) | |
329 | { | |
330 | int rc = 0; | |
331 | u32 dlm_key; | |
332 | struct dlm_ctxt *dlm; | |
333 | struct o2dlm_private *priv; | |
e5f2cb2b | 334 | struct dlm_protocol_version fs_version; |
e3dad42b JB |
335 | |
336 | BUG_ON(conn == NULL); | |
110946c8 | 337 | BUG_ON(conn->cc_proto == NULL); |
e3dad42b | 338 | |
6b27f62f SM |
339 | /* Ensure cluster stack is up and all nodes are connected */ |
340 | rc = o2cb_cluster_check(); | |
341 | if (rc) { | |
342 | printk(KERN_ERR "o2cb: Cluster check failed. Fix errors " | |
343 | "before retrying.\n"); | |
e3dad42b JB |
344 | goto out; |
345 | } | |
346 | ||
347 | priv = kzalloc(sizeof(struct o2dlm_private), GFP_KERNEL); | |
348 | if (!priv) { | |
349 | rc = -ENOMEM; | |
350 | goto out_free; | |
351 | } | |
352 | ||
353 | /* This just fills the structure in. It is safe to pass conn. */ | |
354 | dlm_setup_eviction_cb(&priv->op_eviction_cb, o2dlm_eviction_cb, | |
355 | conn); | |
356 | ||
357 | conn->cc_private = priv; | |
358 | ||
359 | /* used by the dlm code to make message headers unique, each | |
360 | * node in this domain must agree on this. */ | |
361 | dlm_key = crc32_le(0, conn->cc_name, conn->cc_namelen); | |
e5f2cb2b WW |
362 | fs_version.pv_major = conn->cc_version.pv_major; |
363 | fs_version.pv_minor = conn->cc_version.pv_minor; | |
e3dad42b | 364 | |
e5f2cb2b | 365 | dlm = dlm_register_domain(conn->cc_name, dlm_key, &fs_version); |
e3dad42b JB |
366 | if (IS_ERR(dlm)) { |
367 | rc = PTR_ERR(dlm); | |
368 | mlog_errno(rc); | |
369 | goto out_free; | |
370 | } | |
371 | ||
e5f2cb2b WW |
372 | conn->cc_version.pv_major = fs_version.pv_major; |
373 | conn->cc_version.pv_minor = fs_version.pv_minor; | |
e3dad42b JB |
374 | conn->cc_lockspace = dlm; |
375 | ||
376 | dlm_register_eviction_cb(dlm, &priv->op_eviction_cb); | |
377 | ||
378 | out_free: | |
d787ab09 | 379 | if (rc) |
e3dad42b JB |
380 | kfree(conn->cc_private); |
381 | ||
382 | out: | |
383 | return rc; | |
384 | } | |
385 | ||
2c39450b | 386 | static int o2cb_cluster_disconnect(struct ocfs2_cluster_connection *conn) |
e3dad42b JB |
387 | { |
388 | struct dlm_ctxt *dlm = conn->cc_lockspace; | |
389 | struct o2dlm_private *priv = conn->cc_private; | |
390 | ||
391 | dlm_unregister_eviction_cb(&priv->op_eviction_cb); | |
392 | conn->cc_private = NULL; | |
393 | kfree(priv); | |
394 | ||
395 | dlm_unregister_domain(dlm); | |
396 | conn->cc_lockspace = NULL; | |
397 | ||
398 | return 0; | |
399 | } | |
400 | ||
3e834151 GR |
401 | static int o2cb_cluster_this_node(struct ocfs2_cluster_connection *conn, |
402 | unsigned int *node) | |
e3dad42b JB |
403 | { |
404 | int node_num; | |
405 | ||
406 | node_num = o2nm_this_node(); | |
407 | if (node_num == O2NM_INVALID_NODE_NUM) | |
408 | return -ENOENT; | |
409 | ||
410 | if (node_num >= O2NM_MAX_NODES) | |
411 | return -EOVERFLOW; | |
412 | ||
413 | *node = node_num; | |
414 | return 0; | |
415 | } | |
416 | ||
4af694e6 | 417 | static struct ocfs2_stack_operations o2cb_stack_ops = { |
e3dad42b JB |
418 | .connect = o2cb_cluster_connect, |
419 | .disconnect = o2cb_cluster_disconnect, | |
e3dad42b JB |
420 | .this_node = o2cb_cluster_this_node, |
421 | .dlm_lock = o2cb_dlm_lock, | |
422 | .dlm_unlock = o2cb_dlm_unlock, | |
423 | .lock_status = o2cb_dlm_lock_status, | |
1c520dfb | 424 | .lvb_valid = o2cb_dlm_lvb_valid, |
e3dad42b JB |
425 | .lock_lvb = o2cb_dlm_lvb, |
426 | .dump_lksb = o2cb_dump_lksb, | |
427 | }; | |
428 | ||
286eaa95 JB |
429 | static struct ocfs2_stack_plugin o2cb_stack = { |
430 | .sp_name = "o2cb", | |
431 | .sp_ops = &o2cb_stack_ops, | |
432 | .sp_owner = THIS_MODULE, | |
433 | }; | |
434 | ||
435 | static int __init o2cb_stack_init(void) | |
436 | { | |
437 | return ocfs2_stack_glue_register(&o2cb_stack); | |
438 | } | |
439 | ||
440 | static void __exit o2cb_stack_exit(void) | |
441 | { | |
442 | ocfs2_stack_glue_unregister(&o2cb_stack); | |
443 | } | |
444 | ||
445 | MODULE_AUTHOR("Oracle"); | |
446 | MODULE_DESCRIPTION("ocfs2 driver for the classic o2cb stack"); | |
447 | MODULE_LICENSE("GPL"); | |
448 | module_init(o2cb_stack_init); | |
449 | module_exit(o2cb_stack_exit); |