author | Florian Westphal <fw@strlen.de> |
Sun, 11 Jan 2009 20:20:11 +0100 | |
changeset 0 | aa628870c1d3 |
permissions | -rw-r--r-- |
0
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Port of Linux 2.6.28 for use with network simulation cradle.
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/****************************************************************************** |
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******************************************************************************* |
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** |
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** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. |
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** Copyright (C) 2004-2008 Red Hat, Inc. All rights reserved. |
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** |
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** This copyrighted material is made available to anyone wishing to use, |
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** modify, copy, or redistribute it subject to the terms and conditions |
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** of the GNU General Public License v.2. |
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** |
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******************************************************************************* |
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******************************************************************************/ |
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#ifndef __DLM_DOT_H__ |
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#define __DLM_DOT_H__ |
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/* |
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* Interface to Distributed Lock Manager (DLM) |
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* routines and structures to use DLM lockspaces |
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*/ |
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|
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/* Lock levels and flags are here */ |
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#include <linux/dlmconstants.h> |
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#include <linux/types.h> |
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typedef void dlm_lockspace_t; |
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/* |
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* Lock status block |
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* |
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* Use this structure to specify the contents of the lock value block. For a |
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* conversion request, this structure is used to specify the lock ID of the |
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* lock. DLM writes the status of the lock request and the lock ID assigned |
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* to the request in the lock status block. |
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* |
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* sb_lkid: the returned lock ID. It is set on new (non-conversion) requests. |
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* It is available when dlm_lock returns. |
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* |
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* sb_lvbptr: saves or returns the contents of the lock's LVB according to rules |
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* shown for the DLM_LKF_VALBLK flag. |
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* |
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* sb_flags: DLM_SBF_DEMOTED is returned if in the process of promoting a lock, |
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* it was first demoted to NL to avoid conversion deadlock. |
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* DLM_SBF_VALNOTVALID is returned if the resource's LVB is marked invalid. |
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* |
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* sb_status: the returned status of the lock request set prior to AST |
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* execution. Possible return values: |
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* |
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* 0 if lock request was successful |
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* -EAGAIN if request would block and is flagged DLM_LKF_NOQUEUE |
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* -ENOMEM if there is no memory to process request |
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* -EINVAL if there are invalid parameters |
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* -DLM_EUNLOCK if unlock request was successful |
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* -DLM_ECANCEL if a cancel completed successfully |
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*/ |
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#define DLM_SBF_DEMOTED 0x01 |
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#define DLM_SBF_VALNOTVALID 0x02 |
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#define DLM_SBF_ALTMODE 0x04 |
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struct dlm_lksb { |
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int sb_status; |
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__u32 sb_lkid; |
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char sb_flags; |
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char * sb_lvbptr; |
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}; |
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/* dlm_new_lockspace() flags */ |
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#define DLM_LSFL_NODIR 0x00000001 |
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#define DLM_LSFL_TIMEWARN 0x00000002 |
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#define DLM_LSFL_FS 0x00000004 |
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#define DLM_LSFL_NEWEXCL 0x00000008 |
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#ifdef __KERNEL__ |
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/* |
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* dlm_new_lockspace |
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* |
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* Starts a lockspace with the given name. If the named lockspace exists in |
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* the cluster, the calling node joins it. |
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*/ |
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int dlm_new_lockspace(char *name, int namelen, dlm_lockspace_t **lockspace, |
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uint32_t flags, int lvblen); |
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/* |
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* dlm_release_lockspace |
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* |
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* Stop a lockspace. |
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*/ |
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int dlm_release_lockspace(dlm_lockspace_t *lockspace, int force); |
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/* |
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* dlm_lock |
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* |
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* Make an asyncronous request to acquire or convert a lock on a named |
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* resource. |
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* |
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* lockspace: context for the request |
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* mode: the requested mode of the lock (DLM_LOCK_) |
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* lksb: lock status block for input and async return values |
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* flags: input flags (DLM_LKF_) |
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* name: name of the resource to lock, can be binary |
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* namelen: the length in bytes of the resource name (MAX_RESNAME_LEN) |
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* parent: the lock ID of a parent lock or 0 if none |
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* lockast: function DLM executes when it completes processing the request |
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* astarg: argument passed to lockast and bast functions |
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* bast: function DLM executes when this lock later blocks another request |
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* |
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* Returns: |
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* 0 if request is successfully queued for processing |
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* -EINVAL if any input parameters are invalid |
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* -EAGAIN if request would block and is flagged DLM_LKF_NOQUEUE |
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* -ENOMEM if there is no memory to process request |
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* -ENOTCONN if there is a communication error |
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* |
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* If the call to dlm_lock returns an error then the operation has failed and |
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* the AST routine will not be called. If dlm_lock returns 0 it is still |
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* possible that the lock operation will fail. The AST routine will be called |
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* when the locking is complete and the status is returned in the lksb. |
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* |
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* If the AST routines or parameter are passed to a conversion operation then |
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* they will overwrite those values that were passed to a previous dlm_lock |
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* call. |
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* |
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* AST routines should not block (at least not for long), but may make |
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* any locking calls they please. |
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*/ |
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|
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int dlm_lock(dlm_lockspace_t *lockspace, |
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int mode, |
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struct dlm_lksb *lksb, |
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uint32_t flags, |
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void *name, |
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unsigned int namelen, |
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uint32_t parent_lkid, |
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void (*lockast) (void *astarg), |
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void *astarg, |
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void (*bast) (void *astarg, int mode)); |
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|
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/* |
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* dlm_unlock |
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* |
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* Asynchronously release a lock on a resource. The AST routine is called |
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* when the resource is successfully unlocked. |
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* |
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* lockspace: context for the request |
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* lkid: the lock ID as returned in the lksb |
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* flags: input flags (DLM_LKF_) |
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* lksb: if NULL the lksb parameter passed to last lock request is used |
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* astarg: the arg used with the completion ast for the unlock |
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154 |
* |
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* Returns: |
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* 0 if request is successfully queued for processing |
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* -EINVAL if any input parameters are invalid |
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* -ENOTEMPTY if the lock still has sublocks |
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* -EBUSY if the lock is waiting for a remote lock operation |
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* -ENOTCONN if there is a communication error |
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*/ |
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162 |
|
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int dlm_unlock(dlm_lockspace_t *lockspace, |
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uint32_t lkid, |
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uint32_t flags, |
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struct dlm_lksb *lksb, |
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void *astarg); |
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|
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#endif /* __KERNEL__ */ |
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|
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#endif /* __DLM_DOT_H__ */ |
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172 |