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Linux/fs/ocfs2/stackglue.h

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  1 /* -*- mode: c; c-basic-offset: 8; -*-
  2  * vim: noexpandtab sw=8 ts=8 sts=0:
  3  *
  4  * stackglue.h
  5  *
  6  * Glue to the underlying cluster 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 
 20 
 21 #ifndef STACKGLUE_H
 22 #define STACKGLUE_H
 23 
 24 #include <linux/types.h>
 25 #include <linux/list.h>
 26 #include <linux/dlmconstants.h>
 27 
 28 #include "dlm/dlmapi.h"
 29 #include <linux/dlm.h>
 30 
 31 /* Needed for plock-related prototypes */
 32 struct file;
 33 struct file_lock;
 34 
 35 /*
 36  * dlmconstants.h does not have a LOCAL flag.  We hope to remove it
 37  * some day, but right now we need it.  Let's fake it.  This value is larger
 38  * than any flag in dlmconstants.h.
 39  */
 40 #define DLM_LKF_LOCAL           0x00100000
 41 
 42 /*
 43  * This shadows DLM_LOCKSPACE_LEN in fs/dlm/dlm_internal.h.  That probably
 44  * wants to be in a public header.
 45  */
 46 #define GROUP_NAME_MAX          64
 47 
 48 
 49 /*
 50  * ocfs2_protocol_version changes when ocfs2 does something different in
 51  * its inter-node behavior.  See dlmglue.c for more information.
 52  */
 53 struct ocfs2_protocol_version {
 54         u8 pv_major;
 55         u8 pv_minor;
 56 };
 57 
 58 /*
 59  * The dlm_lockstatus struct includes lvb space, but the dlm_lksb struct only
 60  * has a pointer to separately allocated lvb space.  This struct exists only to
 61  * include in the lksb union to make space for a combined dlm_lksb and lvb.
 62  */
 63 struct fsdlm_lksb_plus_lvb {
 64         struct dlm_lksb lksb;
 65         char lvb[DLM_LVB_LEN];
 66 };
 67 
 68 /*
 69  * A union of all lock status structures.  We define it here so that the
 70  * size of the union is known.  Lock status structures are embedded in
 71  * ocfs2 inodes.
 72  */
 73 struct ocfs2_cluster_connection;
 74 struct ocfs2_dlm_lksb {
 75          union {
 76                  struct dlm_lockstatus lksb_o2dlm;
 77                  struct dlm_lksb lksb_fsdlm;
 78                  struct fsdlm_lksb_plus_lvb padding;
 79          };
 80          struct ocfs2_cluster_connection *lksb_conn;
 81 };
 82 
 83 /*
 84  * The ocfs2_locking_protocol defines the handlers called on ocfs2's behalf.
 85  */
 86 struct ocfs2_locking_protocol {
 87         struct ocfs2_protocol_version lp_max_version;
 88         void (*lp_lock_ast)(struct ocfs2_dlm_lksb *lksb);
 89         void (*lp_blocking_ast)(struct ocfs2_dlm_lksb *lksb, int level);
 90         void (*lp_unlock_ast)(struct ocfs2_dlm_lksb *lksb, int error);
 91 };
 92 
 93 
 94 /*
 95  * A cluster connection.  Mostly opaque to ocfs2, the connection holds
 96  * state for the underlying stack.  ocfs2 does use cc_version to determine
 97  * locking compatibility.
 98  */
 99 struct ocfs2_cluster_connection {
100         char cc_name[GROUP_NAME_MAX];
101         int cc_namelen;
102         struct ocfs2_protocol_version cc_version;
103         struct ocfs2_locking_protocol *cc_proto;
104         void (*cc_recovery_handler)(int node_num, void *recovery_data);
105         void *cc_recovery_data;
106         void *cc_lockspace;
107         void *cc_private;
108 };
109 
110 /*
111  * Each cluster stack implements the stack operations structure.  Not used
112  * in the ocfs2 code, the stackglue code translates generic cluster calls
113  * into stack operations.
114  */
115 struct ocfs2_stack_operations {
116         /*
117          * The fs code calls ocfs2_cluster_connect() to attach a new
118          * filesystem to the cluster stack.  The ->connect() op is passed
119          * an ocfs2_cluster_connection with the name and recovery field
120          * filled in.
121          *
122          * The stack must set up any notification mechanisms and create
123          * the filesystem lockspace in the DLM.  The lockspace should be
124          * stored on cc_lockspace.  Any other information can be stored on
125          * cc_private.
126          *
127          * ->connect() must not return until it is guaranteed that
128          *
129          *  - Node down notifications for the filesystem will be received
130          *    and passed to conn->cc_recovery_handler().
131          *  - Locking requests for the filesystem will be processed.
132          */
133         int (*connect)(struct ocfs2_cluster_connection *conn);
134 
135         /*
136          * The fs code calls ocfs2_cluster_disconnect() when a filesystem
137          * no longer needs cluster services.  All DLM locks have been
138          * dropped, and recovery notification is being ignored by the
139          * fs code.  The stack must disengage from the DLM and discontinue
140          * recovery notification.
141          *
142          * Once ->disconnect() has returned, the connection structure will
143          * be freed.  Thus, a stack must not return from ->disconnect()
144          * until it will no longer reference the conn pointer.
145          *
146          * Once this call returns, the stack glue will be dropping this
147          * connection's reference on the module.
148          */
149         int (*disconnect)(struct ocfs2_cluster_connection *conn);
150 
151         /*
152          * ->this_node() returns the cluster's unique identifier for the
153          * local node.
154          */
155         int (*this_node)(unsigned int *node);
156 
157         /*
158          * Call the underlying dlm lock function.  The ->dlm_lock()
159          * callback should convert the flags and mode as appropriate.
160          *
161          * ast and bast functions are not part of the call because the
162          * stack will likely want to wrap ast and bast calls before passing
163          * them to stack->sp_proto.  There is no astarg.  The lksb will
164          * be passed back to the ast and bast functions.  The caller can
165          * use this to find their object.
166          */
167         int (*dlm_lock)(struct ocfs2_cluster_connection *conn,
168                         int mode,
169                         struct ocfs2_dlm_lksb *lksb,
170                         u32 flags,
171                         void *name,
172                         unsigned int namelen);
173 
174         /*
175          * Call the underlying dlm unlock function.  The ->dlm_unlock()
176          * function should convert the flags as appropriate.
177          *
178          * The unlock ast is not passed, as the stack will want to wrap
179          * it before calling stack->sp_proto->lp_unlock_ast().  There is
180          * no astarg.  The lksb will be passed back to the unlock ast
181          * function.  The caller can use this to find their object.
182          */
183         int (*dlm_unlock)(struct ocfs2_cluster_connection *conn,
184                           struct ocfs2_dlm_lksb *lksb,
185                           u32 flags);
186 
187         /*
188          * Return the status of the current lock status block.  The fs
189          * code should never dereference the union.  The ->lock_status()
190          * callback pulls out the stack-specific lksb, converts the status
191          * to a proper errno, and returns it.
192          */
193         int (*lock_status)(struct ocfs2_dlm_lksb *lksb);
194 
195         /*
196          * Return non-zero if the LVB is valid.
197          */
198         int (*lvb_valid)(struct ocfs2_dlm_lksb *lksb);
199 
200         /*
201          * Pull the lvb pointer off of the stack-specific lksb.
202          */
203         void *(*lock_lvb)(struct ocfs2_dlm_lksb *lksb);
204 
205         /*
206          * Cluster-aware posix locks
207          *
208          * This is NULL for stacks which do not support posix locks.
209          */
210         int (*plock)(struct ocfs2_cluster_connection *conn,
211                      u64 ino,
212                      struct file *file,
213                      int cmd,
214                      struct file_lock *fl);
215 
216         /*
217          * This is an optoinal debugging hook.  If provided, the
218          * stack can dump debugging information about this lock.
219          */
220         void (*dump_lksb)(struct ocfs2_dlm_lksb *lksb);
221 };
222 
223 /*
224  * Each stack plugin must describe itself by registering a
225  * ocfs2_stack_plugin structure.  This is only seen by stackglue and the
226  * stack driver.
227  */
228 struct ocfs2_stack_plugin {
229         char *sp_name;
230         struct ocfs2_stack_operations *sp_ops;
231         struct module *sp_owner;
232 
233         /* These are managed by the stackglue code. */
234         struct list_head sp_list;
235         unsigned int sp_count;
236         struct ocfs2_protocol_version sp_max_proto;
237 };
238 
239 
240 /* Used by the filesystem */
241 int ocfs2_cluster_connect(const char *stack_name,
242                           const char *group,
243                           int grouplen,
244                           struct ocfs2_locking_protocol *lproto,
245                           void (*recovery_handler)(int node_num,
246                                                    void *recovery_data),
247                           void *recovery_data,
248                           struct ocfs2_cluster_connection **conn);
249 /*
250  * Used by callers that don't store their stack name.  They must ensure
251  * all nodes have the same stack.
252  */
253 int ocfs2_cluster_connect_agnostic(const char *group,
254                                    int grouplen,
255                                    struct ocfs2_locking_protocol *lproto,
256                                    void (*recovery_handler)(int node_num,
257                                                             void *recovery_data),
258                                    void *recovery_data,
259                                    struct ocfs2_cluster_connection **conn);
260 int ocfs2_cluster_disconnect(struct ocfs2_cluster_connection *conn,
261                              int hangup_pending);
262 void ocfs2_cluster_hangup(const char *group, int grouplen);
263 int ocfs2_cluster_this_node(unsigned int *node);
264 
265 struct ocfs2_lock_res;
266 int ocfs2_dlm_lock(struct ocfs2_cluster_connection *conn,
267                    int mode,
268                    struct ocfs2_dlm_lksb *lksb,
269                    u32 flags,
270                    void *name,
271                    unsigned int namelen);
272 int ocfs2_dlm_unlock(struct ocfs2_cluster_connection *conn,
273                      struct ocfs2_dlm_lksb *lksb,
274                      u32 flags);
275 
276 int ocfs2_dlm_lock_status(struct ocfs2_dlm_lksb *lksb);
277 int ocfs2_dlm_lvb_valid(struct ocfs2_dlm_lksb *lksb);
278 void *ocfs2_dlm_lvb(struct ocfs2_dlm_lksb *lksb);
279 void ocfs2_dlm_dump_lksb(struct ocfs2_dlm_lksb *lksb);
280 
281 int ocfs2_stack_supports_plocks(void);
282 int ocfs2_plock(struct ocfs2_cluster_connection *conn, u64 ino,
283                 struct file *file, int cmd, struct file_lock *fl);
284 
285 void ocfs2_stack_glue_set_max_proto_version(struct ocfs2_protocol_version *max_proto);
286 
287 
288 /* Used by stack plugins */
289 int ocfs2_stack_glue_register(struct ocfs2_stack_plugin *plugin);
290 void ocfs2_stack_glue_unregister(struct ocfs2_stack_plugin *plugin);
291 
292 /* In ocfs2_downconvert_lock(), we need to know which stack we are using */
293 int ocfs2_is_o2cb_active(void);
294 
295 #endif  /* STACKGLUE_H */
296 

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