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Linux/fs/ocfs2/stack_o2cb.c

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  1 // SPDX-License-Identifier: GPL-2.0-only
  2 /* -*- mode: c; c-basic-offset: 8; -*-
  3  * vim: noexpandtab sw=8 ts=8 sts=0:
  4  *
  5  * stack_o2cb.c
  6  *
  7  * Code which interfaces ocfs2 with the o2cb stack.
  8  *
  9  * Copyright (C) 2007 Oracle.  All rights reserved.
 10  */
 11 
 12 #include <linux/kernel.h>
 13 #include <linux/crc32.h>
 14 #include <linux/slab.h>
 15 #include <linux/module.h>
 16 
 17 /* Needed for AOP_TRUNCATED_PAGE in mlog_errno() */
 18 #include <linux/fs.h>
 19 
 20 #include "cluster/masklog.h"
 21 #include "cluster/nodemanager.h"
 22 #include "cluster/heartbeat.h"
 23 #include "cluster/tcp.h"
 24 
 25 #include "stackglue.h"
 26 
 27 struct o2dlm_private {
 28         struct dlm_eviction_cb op_eviction_cb;
 29 };
 30 
 31 static struct ocfs2_stack_plugin o2cb_stack;
 32 
 33 /* These should be identical */
 34 #if (DLM_LOCK_IV != LKM_IVMODE)
 35 # error Lock modes do not match
 36 #endif
 37 #if (DLM_LOCK_NL != LKM_NLMODE)
 38 # error Lock modes do not match
 39 #endif
 40 #if (DLM_LOCK_CR != LKM_CRMODE)
 41 # error Lock modes do not match
 42 #endif
 43 #if (DLM_LOCK_CW != LKM_CWMODE)
 44 # error Lock modes do not match
 45 #endif
 46 #if (DLM_LOCK_PR != LKM_PRMODE)
 47 # error Lock modes do not match
 48 #endif
 49 #if (DLM_LOCK_PW != LKM_PWMODE)
 50 # error Lock modes do not match
 51 #endif
 52 #if (DLM_LOCK_EX != LKM_EXMODE)
 53 # error Lock modes do not match
 54 #endif
 55 static inline int mode_to_o2dlm(int mode)
 56 {
 57         BUG_ON(mode > LKM_MAXMODE);
 58 
 59         return mode;
 60 }
 61 
 62 #define map_flag(_generic, _o2dlm)              \
 63         if (flags & (_generic)) {               \
 64                 flags &= ~(_generic);           \
 65                 o2dlm_flags |= (_o2dlm);        \
 66         }
 67 static int flags_to_o2dlm(u32 flags)
 68 {
 69         int o2dlm_flags = 0;
 70 
 71         map_flag(DLM_LKF_NOQUEUE, LKM_NOQUEUE);
 72         map_flag(DLM_LKF_CANCEL, LKM_CANCEL);
 73         map_flag(DLM_LKF_CONVERT, LKM_CONVERT);
 74         map_flag(DLM_LKF_VALBLK, LKM_VALBLK);
 75         map_flag(DLM_LKF_IVVALBLK, LKM_INVVALBLK);
 76         map_flag(DLM_LKF_ORPHAN, LKM_ORPHAN);
 77         map_flag(DLM_LKF_FORCEUNLOCK, LKM_FORCE);
 78         map_flag(DLM_LKF_TIMEOUT, LKM_TIMEOUT);
 79         map_flag(DLM_LKF_LOCAL, LKM_LOCAL);
 80 
 81         /* map_flag() should have cleared every flag passed in */
 82         BUG_ON(flags != 0);
 83 
 84         return o2dlm_flags;
 85 }
 86 #undef map_flag
 87 
 88 /*
 89  * Map an o2dlm status to standard errno values.
 90  *
 91  * o2dlm only uses a handful of these, and returns even fewer to the
 92  * caller. Still, we try to assign sane values to each error.
 93  *
 94  * The following value pairs have special meanings to dlmglue, thus
 95  * the right hand side needs to stay unique - never duplicate the
 96  * mapping elsewhere in the table!
 97  *
 98  * DLM_NORMAL:          0
 99  * DLM_NOTQUEUED:       -EAGAIN
100  * DLM_CANCELGRANT:     -EBUSY
101  * DLM_CANCEL:          -DLM_ECANCEL
102  */
103 /* Keep in sync with dlmapi.h */
104 static int status_map[] = {
105         [DLM_NORMAL]                    = 0,            /* Success */
106         [DLM_GRANTED]                   = -EINVAL,
107         [DLM_DENIED]                    = -EACCES,
108         [DLM_DENIED_NOLOCKS]            = -EACCES,
109         [DLM_WORKING]                   = -EACCES,
110         [DLM_BLOCKED]                   = -EINVAL,
111         [DLM_BLOCKED_ORPHAN]            = -EINVAL,
112         [DLM_DENIED_GRACE_PERIOD]       = -EACCES,
113         [DLM_SYSERR]                    = -ENOMEM,      /* It is what it is */
114         [DLM_NOSUPPORT]                 = -EPROTO,
115         [DLM_CANCELGRANT]               = -EBUSY,       /* Cancel after grant */
116         [DLM_IVLOCKID]                  = -EINVAL,
117         [DLM_SYNC]                      = -EINVAL,
118         [DLM_BADTYPE]                   = -EINVAL,
119         [DLM_BADRESOURCE]               = -EINVAL,
120         [DLM_MAXHANDLES]                = -ENOMEM,
121         [DLM_NOCLINFO]                  = -EINVAL,
122         [DLM_NOLOCKMGR]                 = -EINVAL,
123         [DLM_NOPURGED]                  = -EINVAL,
124         [DLM_BADARGS]                   = -EINVAL,
125         [DLM_VOID]                      = -EINVAL,
126         [DLM_NOTQUEUED]                 = -EAGAIN,      /* Trylock failed */
127         [DLM_IVBUFLEN]                  = -EINVAL,
128         [DLM_CVTUNGRANT]                = -EPERM,
129         [DLM_BADPARAM]                  = -EINVAL,
130         [DLM_VALNOTVALID]               = -EINVAL,
131         [DLM_REJECTED]                  = -EPERM,
132         [DLM_ABORT]                     = -EINVAL,
133         [DLM_CANCEL]                    = -DLM_ECANCEL, /* Successful cancel */
134         [DLM_IVRESHANDLE]               = -EINVAL,
135         [DLM_DEADLOCK]                  = -EDEADLK,
136         [DLM_DENIED_NOASTS]             = -EINVAL,
137         [DLM_FORWARD]                   = -EINVAL,
138         [DLM_TIMEOUT]                   = -ETIMEDOUT,
139         [DLM_IVGROUPID]                 = -EINVAL,
140         [DLM_VERS_CONFLICT]             = -EOPNOTSUPP,
141         [DLM_BAD_DEVICE_PATH]           = -ENOENT,
142         [DLM_NO_DEVICE_PERMISSION]      = -EPERM,
143         [DLM_NO_CONTROL_DEVICE]         = -ENOENT,
144         [DLM_RECOVERING]                = -ENOTCONN,
145         [DLM_MIGRATING]                 = -ERESTART,
146         [DLM_MAXSTATS]                  = -EINVAL,
147 };
148 
149 static int dlm_status_to_errno(enum dlm_status status)
150 {
151         BUG_ON(status < 0 || status >= ARRAY_SIZE(status_map));
152 
153         return status_map[status];
154 }
155 
156 static void o2dlm_lock_ast_wrapper(void *astarg)
157 {
158         struct ocfs2_dlm_lksb *lksb = astarg;
159 
160         lksb->lksb_conn->cc_proto->lp_lock_ast(lksb);
161 }
162 
163 static void o2dlm_blocking_ast_wrapper(void *astarg, int level)
164 {
165         struct ocfs2_dlm_lksb *lksb = astarg;
166 
167         lksb->lksb_conn->cc_proto->lp_blocking_ast(lksb, level);
168 }
169 
170 static void o2dlm_unlock_ast_wrapper(void *astarg, enum dlm_status status)
171 {
172         struct ocfs2_dlm_lksb *lksb = astarg;
173         int error = dlm_status_to_errno(status);
174 
175         /*
176          * In o2dlm, you can get both the lock_ast() for the lock being
177          * granted and the unlock_ast() for the CANCEL failing.  A
178          * successful cancel sends DLM_NORMAL here.  If the
179          * lock grant happened before the cancel arrived, you get
180          * DLM_CANCELGRANT.
181          *
182          * There's no need for the double-ast.  If we see DLM_CANCELGRANT,
183          * we just ignore it.  We expect the lock_ast() to handle the
184          * granted lock.
185          */
186         if (status == DLM_CANCELGRANT)
187                 return;
188 
189         lksb->lksb_conn->cc_proto->lp_unlock_ast(lksb, error);
190 }
191 
192 static int o2cb_dlm_lock(struct ocfs2_cluster_connection *conn,
193                          int mode,
194                          struct ocfs2_dlm_lksb *lksb,
195                          u32 flags,
196                          void *name,
197                          unsigned int namelen)
198 {
199         enum dlm_status status;
200         int o2dlm_mode = mode_to_o2dlm(mode);
201         int o2dlm_flags = flags_to_o2dlm(flags);
202         int ret;
203 
204         status = dlmlock(conn->cc_lockspace, o2dlm_mode, &lksb->lksb_o2dlm,
205                          o2dlm_flags, name, namelen,
206                          o2dlm_lock_ast_wrapper, lksb,
207                          o2dlm_blocking_ast_wrapper);
208         ret = dlm_status_to_errno(status);
209         return ret;
210 }
211 
212 static int o2cb_dlm_unlock(struct ocfs2_cluster_connection *conn,
213                            struct ocfs2_dlm_lksb *lksb,
214                            u32 flags)
215 {
216         enum dlm_status status;
217         int o2dlm_flags = flags_to_o2dlm(flags);
218         int ret;
219 
220         status = dlmunlock(conn->cc_lockspace, &lksb->lksb_o2dlm,
221                            o2dlm_flags, o2dlm_unlock_ast_wrapper, lksb);
222         ret = dlm_status_to_errno(status);
223         return ret;
224 }
225 
226 static int o2cb_dlm_lock_status(struct ocfs2_dlm_lksb *lksb)
227 {
228         return dlm_status_to_errno(lksb->lksb_o2dlm.status);
229 }
230 
231 /*
232  * o2dlm aways has a "valid" LVB. If the dlm loses track of the LVB
233  * contents, it will zero out the LVB.  Thus the caller can always trust
234  * the contents.
235  */
236 static int o2cb_dlm_lvb_valid(struct ocfs2_dlm_lksb *lksb)
237 {
238         return 1;
239 }
240 
241 static void *o2cb_dlm_lvb(struct ocfs2_dlm_lksb *lksb)
242 {
243         return (void *)(lksb->lksb_o2dlm.lvb);
244 }
245 
246 static void o2cb_dump_lksb(struct ocfs2_dlm_lksb *lksb)
247 {
248         dlm_print_one_lock(lksb->lksb_o2dlm.lockid);
249 }
250 
251 /*
252  * Check if this node is heartbeating and is connected to all other
253  * heartbeating nodes.
254  */
255 static int o2cb_cluster_check(void)
256 {
257         u8 node_num;
258         int i;
259         unsigned long hbmap[BITS_TO_LONGS(O2NM_MAX_NODES)];
260         unsigned long netmap[BITS_TO_LONGS(O2NM_MAX_NODES)];
261 
262         node_num = o2nm_this_node();
263         if (node_num == O2NM_MAX_NODES) {
264                 printk(KERN_ERR "o2cb: This node has not been configured.\n");
265                 return -EINVAL;
266         }
267 
268         /*
269          * o2dlm expects o2net sockets to be created. If not, then
270          * dlm_join_domain() fails with a stack of errors which are both cryptic
271          * and incomplete. The idea here is to detect upfront whether we have
272          * managed to connect to all nodes or not. If not, then list the nodes
273          * to allow the user to check the configuration (incorrect IP, firewall,
274          * etc.) Yes, this is racy. But its not the end of the world.
275          */
276 #define O2CB_MAP_STABILIZE_COUNT        60
277         for (i = 0; i < O2CB_MAP_STABILIZE_COUNT; ++i) {
278                 o2hb_fill_node_map(hbmap, sizeof(hbmap));
279                 if (!test_bit(node_num, hbmap)) {
280                         printk(KERN_ERR "o2cb: %s heartbeat has not been "
281                                "started.\n", (o2hb_global_heartbeat_active() ?
282                                               "Global" : "Local"));
283                         return -EINVAL;
284                 }
285                 o2net_fill_node_map(netmap, sizeof(netmap));
286                 /* Force set the current node to allow easy compare */
287                 set_bit(node_num, netmap);
288                 if (!memcmp(hbmap, netmap, sizeof(hbmap)))
289                         return 0;
290                 if (i < O2CB_MAP_STABILIZE_COUNT - 1)
291                         msleep(1000);
292         }
293 
294         printk(KERN_ERR "o2cb: This node could not connect to nodes:");
295         i = -1;
296         while ((i = find_next_bit(hbmap, O2NM_MAX_NODES,
297                                   i + 1)) < O2NM_MAX_NODES) {
298                 if (!test_bit(i, netmap))
299                         printk(" %u", i);
300         }
301         printk(".\n");
302 
303         return -ENOTCONN;
304 }
305 
306 /*
307  * Called from the dlm when it's about to evict a node. This is how the
308  * classic stack signals node death.
309  */
310 static void o2dlm_eviction_cb(int node_num, void *data)
311 {
312         struct ocfs2_cluster_connection *conn = data;
313 
314         printk(KERN_NOTICE "o2cb: o2dlm has evicted node %d from domain %.*s\n",
315                node_num, conn->cc_namelen, conn->cc_name);
316 
317         conn->cc_recovery_handler(node_num, conn->cc_recovery_data);
318 }
319 
320 static int o2cb_cluster_connect(struct ocfs2_cluster_connection *conn)
321 {
322         int rc = 0;
323         u32 dlm_key;
324         struct dlm_ctxt *dlm;
325         struct o2dlm_private *priv;
326         struct dlm_protocol_version fs_version;
327 
328         BUG_ON(conn == NULL);
329         BUG_ON(conn->cc_proto == NULL);
330 
331         /* Ensure cluster stack is up and all nodes are connected */
332         rc = o2cb_cluster_check();
333         if (rc) {
334                 printk(KERN_ERR "o2cb: Cluster check failed. Fix errors "
335                        "before retrying.\n");
336                 goto out;
337         }
338 
339         priv = kzalloc(sizeof(struct o2dlm_private), GFP_KERNEL);
340         if (!priv) {
341                 rc = -ENOMEM;
342                 goto out_free;
343         }
344 
345         /* This just fills the structure in.  It is safe to pass conn. */
346         dlm_setup_eviction_cb(&priv->op_eviction_cb, o2dlm_eviction_cb,
347                               conn);
348 
349         conn->cc_private = priv;
350 
351         /* used by the dlm code to make message headers unique, each
352          * node in this domain must agree on this. */
353         dlm_key = crc32_le(0, conn->cc_name, conn->cc_namelen);
354         fs_version.pv_major = conn->cc_version.pv_major;
355         fs_version.pv_minor = conn->cc_version.pv_minor;
356 
357         dlm = dlm_register_domain(conn->cc_name, dlm_key, &fs_version);
358         if (IS_ERR(dlm)) {
359                 rc = PTR_ERR(dlm);
360                 mlog_errno(rc);
361                 goto out_free;
362         }
363 
364         conn->cc_version.pv_major = fs_version.pv_major;
365         conn->cc_version.pv_minor = fs_version.pv_minor;
366         conn->cc_lockspace = dlm;
367 
368         dlm_register_eviction_cb(dlm, &priv->op_eviction_cb);
369 
370 out_free:
371         if (rc)
372                 kfree(conn->cc_private);
373 
374 out:
375         return rc;
376 }
377 
378 static int o2cb_cluster_disconnect(struct ocfs2_cluster_connection *conn)
379 {
380         struct dlm_ctxt *dlm = conn->cc_lockspace;
381         struct o2dlm_private *priv = conn->cc_private;
382 
383         dlm_unregister_eviction_cb(&priv->op_eviction_cb);
384         conn->cc_private = NULL;
385         kfree(priv);
386 
387         dlm_unregister_domain(dlm);
388         conn->cc_lockspace = NULL;
389 
390         return 0;
391 }
392 
393 static int o2cb_cluster_this_node(struct ocfs2_cluster_connection *conn,
394                                   unsigned int *node)
395 {
396         int node_num;
397 
398         node_num = o2nm_this_node();
399         if (node_num == O2NM_INVALID_NODE_NUM)
400                 return -ENOENT;
401 
402         if (node_num >= O2NM_MAX_NODES)
403                 return -EOVERFLOW;
404 
405         *node = node_num;
406         return 0;
407 }
408 
409 static struct ocfs2_stack_operations o2cb_stack_ops = {
410         .connect        = o2cb_cluster_connect,
411         .disconnect     = o2cb_cluster_disconnect,
412         .this_node      = o2cb_cluster_this_node,
413         .dlm_lock       = o2cb_dlm_lock,
414         .dlm_unlock     = o2cb_dlm_unlock,
415         .lock_status    = o2cb_dlm_lock_status,
416         .lvb_valid      = o2cb_dlm_lvb_valid,
417         .lock_lvb       = o2cb_dlm_lvb,
418         .dump_lksb      = o2cb_dump_lksb,
419 };
420 
421 static struct ocfs2_stack_plugin o2cb_stack = {
422         .sp_name        = "o2cb",
423         .sp_ops         = &o2cb_stack_ops,
424         .sp_owner       = THIS_MODULE,
425 };
426 
427 static int __init o2cb_stack_init(void)
428 {
429         return ocfs2_stack_glue_register(&o2cb_stack);
430 }
431 
432 static void __exit o2cb_stack_exit(void)
433 {
434         ocfs2_stack_glue_unregister(&o2cb_stack);
435 }
436 
437 MODULE_AUTHOR("Oracle");
438 MODULE_DESCRIPTION("ocfs2 driver for the classic o2cb stack");
439 MODULE_LICENSE("GPL");
440 module_init(o2cb_stack_init);
441 module_exit(o2cb_stack_exit);
442 

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