mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-11-30 09:56:40 +07:00
3bcd3687f8
This patch removes support for range locking from the DLM Signed-off-by: David Teigland <teigland@redhat.com> Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
303 lines
9.2 KiB
C
303 lines
9.2 KiB
C
/******************************************************************************
|
|
*******************************************************************************
|
|
**
|
|
** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
|
|
** Copyright (C) 2004-2005 Red Hat, Inc. All rights reserved.
|
|
**
|
|
** This copyrighted material is made available to anyone wishing to use,
|
|
** modify, copy, or redistribute it subject to the terms and conditions
|
|
** of the GNU General Public License v.2.
|
|
**
|
|
*******************************************************************************
|
|
******************************************************************************/
|
|
|
|
#ifndef __DLM_DOT_H__
|
|
#define __DLM_DOT_H__
|
|
|
|
/*
|
|
* Interface to Distributed Lock Manager (DLM)
|
|
* routines and structures to use DLM lockspaces
|
|
*/
|
|
|
|
/*
|
|
* Lock Modes
|
|
*/
|
|
|
|
#define DLM_LOCK_IV -1 /* invalid */
|
|
#define DLM_LOCK_NL 0 /* null */
|
|
#define DLM_LOCK_CR 1 /* concurrent read */
|
|
#define DLM_LOCK_CW 2 /* concurrent write */
|
|
#define DLM_LOCK_PR 3 /* protected read */
|
|
#define DLM_LOCK_PW 4 /* protected write */
|
|
#define DLM_LOCK_EX 5 /* exclusive */
|
|
|
|
/*
|
|
* Maximum size in bytes of a dlm_lock name
|
|
*/
|
|
|
|
#define DLM_RESNAME_MAXLEN 64
|
|
|
|
/*
|
|
* Flags to dlm_lock
|
|
*
|
|
* DLM_LKF_NOQUEUE
|
|
*
|
|
* Do not queue the lock request on the wait queue if it cannot be granted
|
|
* immediately. If the lock cannot be granted because of this flag, DLM will
|
|
* either return -EAGAIN from the dlm_lock call or will return 0 from
|
|
* dlm_lock and -EAGAIN in the lock status block when the AST is executed.
|
|
*
|
|
* DLM_LKF_CANCEL
|
|
*
|
|
* Used to cancel a pending lock request or conversion. A converting lock is
|
|
* returned to its previously granted mode.
|
|
*
|
|
* DLM_LKF_CONVERT
|
|
*
|
|
* Indicates a lock conversion request. For conversions the name and namelen
|
|
* are ignored and the lock ID in the LKSB is used to identify the lock.
|
|
*
|
|
* DLM_LKF_VALBLK
|
|
*
|
|
* Requests DLM to return the current contents of the lock value block in the
|
|
* lock status block. When this flag is set in a lock conversion from PW or EX
|
|
* modes, DLM assigns the value specified in the lock status block to the lock
|
|
* value block of the lock resource. The LVB is a DLM_LVB_LEN size array
|
|
* containing application-specific information.
|
|
*
|
|
* DLM_LKF_QUECVT
|
|
*
|
|
* Force a conversion request to be queued, even if it is compatible with
|
|
* the granted modes of other locks on the same resource.
|
|
*
|
|
* DLM_LKF_IVVALBLK
|
|
*
|
|
* Invalidate the lock value block.
|
|
*
|
|
* DLM_LKF_CONVDEADLK
|
|
*
|
|
* Allows the dlm to resolve conversion deadlocks internally by demoting the
|
|
* granted mode of a converting lock to NL. The DLM_SBF_DEMOTED flag is
|
|
* returned for a conversion that's been effected by this.
|
|
*
|
|
* DLM_LKF_PERSISTENT
|
|
*
|
|
* Only relevant to locks originating in userspace. A persistent lock will not
|
|
* be removed if the process holding the lock exits.
|
|
*
|
|
* DLM_LKF_NODLKWT
|
|
* DLM_LKF_NODLCKBLK
|
|
*
|
|
* net yet implemented
|
|
*
|
|
* DLM_LKF_EXPEDITE
|
|
*
|
|
* Used only with new requests for NL mode locks. Tells the lock manager
|
|
* to grant the lock, ignoring other locks in convert and wait queues.
|
|
*
|
|
* DLM_LKF_NOQUEUEBAST
|
|
*
|
|
* Send blocking AST's before returning -EAGAIN to the caller. It is only
|
|
* used along with the NOQUEUE flag. Blocking AST's are not sent for failed
|
|
* NOQUEUE requests otherwise.
|
|
*
|
|
* DLM_LKF_HEADQUE
|
|
*
|
|
* Add a lock to the head of the convert or wait queue rather than the tail.
|
|
*
|
|
* DLM_LKF_NOORDER
|
|
*
|
|
* Disregard the standard grant order rules and grant a lock as soon as it
|
|
* is compatible with other granted locks.
|
|
*
|
|
* DLM_LKF_ORPHAN
|
|
*
|
|
* not yet implemented
|
|
*
|
|
* DLM_LKF_ALTPR
|
|
*
|
|
* If the requested mode cannot be granted immediately, try to grant the lock
|
|
* in PR mode instead. If this alternate mode is granted instead of the
|
|
* requested mode, DLM_SBF_ALTMODE is returned in the lksb.
|
|
*
|
|
* DLM_LKF_ALTCW
|
|
*
|
|
* The same as ALTPR, but the alternate mode is CW.
|
|
*
|
|
* DLM_LKF_FORCEUNLOCK
|
|
*
|
|
* Unlock the lock even if it is converting or waiting or has sublocks.
|
|
* Only really for use by the userland device.c code.
|
|
*
|
|
*/
|
|
|
|
#define DLM_LKF_NOQUEUE 0x00000001
|
|
#define DLM_LKF_CANCEL 0x00000002
|
|
#define DLM_LKF_CONVERT 0x00000004
|
|
#define DLM_LKF_VALBLK 0x00000008
|
|
#define DLM_LKF_QUECVT 0x00000010
|
|
#define DLM_LKF_IVVALBLK 0x00000020
|
|
#define DLM_LKF_CONVDEADLK 0x00000040
|
|
#define DLM_LKF_PERSISTENT 0x00000080
|
|
#define DLM_LKF_NODLCKWT 0x00000100
|
|
#define DLM_LKF_NODLCKBLK 0x00000200
|
|
#define DLM_LKF_EXPEDITE 0x00000400
|
|
#define DLM_LKF_NOQUEUEBAST 0x00000800
|
|
#define DLM_LKF_HEADQUE 0x00001000
|
|
#define DLM_LKF_NOORDER 0x00002000
|
|
#define DLM_LKF_ORPHAN 0x00004000
|
|
#define DLM_LKF_ALTPR 0x00008000
|
|
#define DLM_LKF_ALTCW 0x00010000
|
|
#define DLM_LKF_FORCEUNLOCK 0x00020000
|
|
|
|
/*
|
|
* Some return codes that are not in errno.h
|
|
*/
|
|
|
|
#define DLM_ECANCEL 0x10001
|
|
#define DLM_EUNLOCK 0x10002
|
|
|
|
typedef void dlm_lockspace_t;
|
|
|
|
/*
|
|
* Lock status block
|
|
*
|
|
* Use this structure to specify the contents of the lock value block. For a
|
|
* conversion request, this structure is used to specify the lock ID of the
|
|
* lock. DLM writes the status of the lock request and the lock ID assigned
|
|
* to the request in the lock status block.
|
|
*
|
|
* sb_lkid: the returned lock ID. It is set on new (non-conversion) requests.
|
|
* It is available when dlm_lock returns.
|
|
*
|
|
* sb_lvbptr: saves or returns the contents of the lock's LVB according to rules
|
|
* shown for the DLM_LKF_VALBLK flag.
|
|
*
|
|
* sb_flags: DLM_SBF_DEMOTED is returned if in the process of promoting a lock,
|
|
* it was first demoted to NL to avoid conversion deadlock.
|
|
* DLM_SBF_VALNOTVALID is returned if the resource's LVB is marked invalid.
|
|
*
|
|
* sb_status: the returned status of the lock request set prior to AST
|
|
* execution. Possible return values:
|
|
*
|
|
* 0 if lock request was successful
|
|
* -EAGAIN if request would block and is flagged DLM_LKF_NOQUEUE
|
|
* -ENOMEM if there is no memory to process request
|
|
* -EINVAL if there are invalid parameters
|
|
* -DLM_EUNLOCK if unlock request was successful
|
|
* -DLM_ECANCEL if a cancel completed successfully
|
|
*/
|
|
|
|
#define DLM_SBF_DEMOTED 0x01
|
|
#define DLM_SBF_VALNOTVALID 0x02
|
|
#define DLM_SBF_ALTMODE 0x04
|
|
|
|
struct dlm_lksb {
|
|
int sb_status;
|
|
uint32_t sb_lkid;
|
|
char sb_flags;
|
|
char * sb_lvbptr;
|
|
};
|
|
|
|
|
|
#ifdef __KERNEL__
|
|
|
|
#define DLM_LSFL_NODIR 0x00000001
|
|
|
|
/*
|
|
* dlm_new_lockspace
|
|
*
|
|
* Starts a lockspace with the given name. If the named lockspace exists in
|
|
* the cluster, the calling node joins it.
|
|
*/
|
|
|
|
int dlm_new_lockspace(char *name, int namelen, dlm_lockspace_t **lockspace,
|
|
uint32_t flags, int lvblen);
|
|
|
|
/*
|
|
* dlm_release_lockspace
|
|
*
|
|
* Stop a lockspace.
|
|
*/
|
|
|
|
int dlm_release_lockspace(dlm_lockspace_t *lockspace, int force);
|
|
|
|
/*
|
|
* dlm_lock
|
|
*
|
|
* Make an asyncronous request to acquire or convert a lock on a named
|
|
* resource.
|
|
*
|
|
* lockspace: context for the request
|
|
* mode: the requested mode of the lock (DLM_LOCK_)
|
|
* lksb: lock status block for input and async return values
|
|
* flags: input flags (DLM_LKF_)
|
|
* name: name of the resource to lock, can be binary
|
|
* namelen: the length in bytes of the resource name (MAX_RESNAME_LEN)
|
|
* parent: the lock ID of a parent lock or 0 if none
|
|
* lockast: function DLM executes when it completes processing the request
|
|
* astarg: argument passed to lockast and bast functions
|
|
* bast: function DLM executes when this lock later blocks another request
|
|
*
|
|
* Returns:
|
|
* 0 if request is successfully queued for processing
|
|
* -EINVAL if any input parameters are invalid
|
|
* -EAGAIN if request would block and is flagged DLM_LKF_NOQUEUE
|
|
* -ENOMEM if there is no memory to process request
|
|
* -ENOTCONN if there is a communication error
|
|
*
|
|
* If the call to dlm_lock returns an error then the operation has failed and
|
|
* the AST routine will not be called. If dlm_lock returns 0 it is still
|
|
* possible that the lock operation will fail. The AST routine will be called
|
|
* when the locking is complete and the status is returned in the lksb.
|
|
*
|
|
* If the AST routines or parameter are passed to a conversion operation then
|
|
* they will overwrite those values that were passed to a previous dlm_lock
|
|
* call.
|
|
*
|
|
* AST routines should not block (at least not for long), but may make
|
|
* any locking calls they please.
|
|
*/
|
|
|
|
int dlm_lock(dlm_lockspace_t *lockspace,
|
|
int mode,
|
|
struct dlm_lksb *lksb,
|
|
uint32_t flags,
|
|
void *name,
|
|
unsigned int namelen,
|
|
uint32_t parent_lkid,
|
|
void (*lockast) (void *astarg),
|
|
void *astarg,
|
|
void (*bast) (void *astarg, int mode));
|
|
|
|
/*
|
|
* dlm_unlock
|
|
*
|
|
* Asynchronously release a lock on a resource. The AST routine is called
|
|
* when the resource is successfully unlocked.
|
|
*
|
|
* lockspace: context for the request
|
|
* lkid: the lock ID as returned in the lksb
|
|
* flags: input flags (DLM_LKF_)
|
|
* lksb: if NULL the lksb parameter passed to last lock request is used
|
|
* astarg: the arg used with the completion ast for the unlock
|
|
*
|
|
* Returns:
|
|
* 0 if request is successfully queued for processing
|
|
* -EINVAL if any input parameters are invalid
|
|
* -ENOTEMPTY if the lock still has sublocks
|
|
* -EBUSY if the lock is waiting for a remote lock operation
|
|
* -ENOTCONN if there is a communication error
|
|
*/
|
|
|
|
int dlm_unlock(dlm_lockspace_t *lockspace,
|
|
uint32_t lkid,
|
|
uint32_t flags,
|
|
struct dlm_lksb *lksb,
|
|
void *astarg);
|
|
|
|
#endif /* __KERNEL__ */
|
|
|
|
#endif /* __DLM_DOT_H__ */
|
|
|