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TOMOYO Linux Cross Reference
Linux/include/linux/dlm.h

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  1 /******************************************************************************
  2 *******************************************************************************
  3 **
  4 **  Copyright (C) Sistina Software, Inc.  1997-2003  All rights reserved.
  5 **  Copyright (C) 2004-2008 Red Hat, Inc.  All rights reserved.
  6 **
  7 **  This copyrighted material is made available to anyone wishing to use,
  8 **  modify, copy, or redistribute it subject to the terms and conditions
  9 **  of the GNU General Public License v.2.
 10 **
 11 *******************************************************************************
 12 ******************************************************************************/
 13 
 14 #ifndef __DLM_DOT_H__
 15 #define __DLM_DOT_H__
 16 
 17 /*
 18  * Interface to Distributed Lock Manager (DLM)
 19  * routines and structures to use DLM lockspaces
 20  */
 21 
 22 /* Lock levels and flags are here */
 23 #include <linux/dlmconstants.h>
 24 #include <linux/types.h>
 25 
 26 typedef void dlm_lockspace_t;
 27 
 28 /*
 29  * Lock status block
 30  *
 31  * Use this structure to specify the contents of the lock value block.  For a
 32  * conversion request, this structure is used to specify the lock ID of the
 33  * lock.  DLM writes the status of the lock request and the lock ID assigned
 34  * to the request in the lock status block.
 35  *
 36  * sb_lkid: the returned lock ID.  It is set on new (non-conversion) requests.
 37  * It is available when dlm_lock returns.
 38  *
 39  * sb_lvbptr: saves or returns the contents of the lock's LVB according to rules
 40  * shown for the DLM_LKF_VALBLK flag.
 41  *
 42  * sb_flags: DLM_SBF_DEMOTED is returned if in the process of promoting a lock,
 43  * it was first demoted to NL to avoid conversion deadlock.
 44  * DLM_SBF_VALNOTVALID is returned if the resource's LVB is marked invalid.
 45  *
 46  * sb_status: the returned status of the lock request set prior to AST
 47  * execution.  Possible return values:
 48  *
 49  * 0 if lock request was successful
 50  * -EAGAIN if request would block and is flagged DLM_LKF_NOQUEUE
 51  * -ENOMEM if there is no memory to process request
 52  * -EINVAL if there are invalid parameters
 53  * -DLM_EUNLOCK if unlock request was successful
 54  * -DLM_ECANCEL if a cancel completed successfully
 55  */
 56 
 57 #define DLM_SBF_DEMOTED         0x01
 58 #define DLM_SBF_VALNOTVALID     0x02
 59 #define DLM_SBF_ALTMODE         0x04
 60 
 61 struct dlm_lksb {
 62         int      sb_status;
 63         __u32    sb_lkid;
 64         char     sb_flags;
 65         char *   sb_lvbptr;
 66 };
 67 
 68 /* dlm_new_lockspace() flags */
 69 
 70 #define DLM_LSFL_NODIR          0x00000001
 71 #define DLM_LSFL_TIMEWARN       0x00000002
 72 #define DLM_LSFL_FS             0x00000004
 73 #define DLM_LSFL_NEWEXCL        0x00000008
 74 
 75 #ifdef __KERNEL__
 76 
 77 /*
 78  * dlm_new_lockspace
 79  *
 80  * Starts a lockspace with the given name.  If the named lockspace exists in
 81  * the cluster, the calling node joins it.
 82  */
 83 
 84 int dlm_new_lockspace(const char *name, int namelen,
 85                       dlm_lockspace_t **lockspace, uint32_t flags, int lvblen);
 86 
 87 /*
 88  * dlm_release_lockspace
 89  *
 90  * Stop a lockspace.
 91  */
 92 
 93 int dlm_release_lockspace(dlm_lockspace_t *lockspace, int force);
 94 
 95 /*
 96  * dlm_lock
 97  *
 98  * Make an asyncronous request to acquire or convert a lock on a named
 99  * resource.
100  *
101  * lockspace: context for the request
102  * mode: the requested mode of the lock (DLM_LOCK_)
103  * lksb: lock status block for input and async return values
104  * flags: input flags (DLM_LKF_)
105  * name: name of the resource to lock, can be binary
106  * namelen: the length in bytes of the resource name (MAX_RESNAME_LEN)
107  * parent: the lock ID of a parent lock or 0 if none
108  * lockast: function DLM executes when it completes processing the request
109  * astarg: argument passed to lockast and bast functions
110  * bast: function DLM executes when this lock later blocks another request
111  *
112  * Returns:
113  * 0 if request is successfully queued for processing
114  * -EINVAL if any input parameters are invalid
115  * -EAGAIN if request would block and is flagged DLM_LKF_NOQUEUE
116  * -ENOMEM if there is no memory to process request
117  * -ENOTCONN if there is a communication error
118  *
119  * If the call to dlm_lock returns an error then the operation has failed and
120  * the AST routine will not be called.  If dlm_lock returns 0 it is still
121  * possible that the lock operation will fail. The AST routine will be called
122  * when the locking is complete and the status is returned in the lksb.
123  *
124  * If the AST routines or parameter are passed to a conversion operation then
125  * they will overwrite those values that were passed to a previous dlm_lock
126  * call.
127  *
128  * AST routines should not block (at least not for long), but may make
129  * any locking calls they please.
130  */
131 
132 int dlm_lock(dlm_lockspace_t *lockspace,
133              int mode,
134              struct dlm_lksb *lksb,
135              uint32_t flags,
136              void *name,
137              unsigned int namelen,
138              uint32_t parent_lkid,
139              void (*lockast) (void *astarg),
140              void *astarg,
141              void (*bast) (void *astarg, int mode));
142 
143 /*
144  * dlm_unlock
145  *
146  * Asynchronously release a lock on a resource.  The AST routine is called
147  * when the resource is successfully unlocked.
148  *
149  * lockspace: context for the request
150  * lkid: the lock ID as returned in the lksb
151  * flags: input flags (DLM_LKF_)
152  * lksb: if NULL the lksb parameter passed to last lock request is used
153  * astarg: the arg used with the completion ast for the unlock
154  *
155  * Returns:
156  * 0 if request is successfully queued for processing
157  * -EINVAL if any input parameters are invalid
158  * -ENOTEMPTY if the lock still has sublocks
159  * -EBUSY if the lock is waiting for a remote lock operation
160  * -ENOTCONN if there is a communication error
161  */
162 
163 int dlm_unlock(dlm_lockspace_t *lockspace,
164                uint32_t lkid,
165                uint32_t flags,
166                struct dlm_lksb *lksb,
167                void *astarg);
168 
169 #endif                          /* __KERNEL__ */
170 
171 #endif                          /* __DLM_DOT_H__ */
172 
173 

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