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01c7a59789
This patch removes code parts which was declared deprecated by
commit 6b0afc0cc3 ("fs: dlm: don't use deprecated timeout features by
default"). This contains the following dlm functionality:
- start a cancel of a dlm request did not complete after certain timeout:
The current way how dlm cancellation works and interfering with other
dlm requests triggered by the user can end in an overlapping and
returning in -EBUSY. The most user don't handle this case and are
unaware that DLM can return such errno in such situation. Due the
timeout the user are mostly unaware when this happens.
- start a netlink warning messages for user space if dlm requests did
not complete after certain timeout:
This feature was never being built in the only known dlm user space side.
As we are to remove the timeout cancellation feature we can directly
remove this feature as well.
There might be the possibility to bring the timeout cancellation feature
back. However the current way of handling the -EBUSY case which is only
a software limitation and not a hardware limitation should be changed.
We minimize the current code base in DLM cancellation feature to not have
to deal with those existing features while solving the DLM cancellation
feature in general.
UAPI define DLM_LSFL_TIMEWARN is commented as deprecated and reserved
value. We should avoid at first to give it a new meaning but let
possible users still compile by keeping this define. In far future we
can give this flag a new meaning. The same for the DLM_LKF_TIMEOUT lock
request flag.
Signed-off-by: Alexander Aring <aahringo@redhat.com>
Signed-off-by: David Teigland <teigland@redhat.com>
167 lines
5 KiB
C
167 lines
5 KiB
C
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
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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) 2004-2007 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 __DLMCONSTANTS_DOT_H__
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#define __DLMCONSTANTS_DOT_H__
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/*
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* Constants used by DLM interface.
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*/
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#define DLM_LOCKSPACE_LEN 64
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#define DLM_RESNAME_MAXLEN 64
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/*
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* Lock Modes
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*/
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#define DLM_LOCK_IV (-1) /* invalid */
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#define DLM_LOCK_NL 0 /* null */
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#define DLM_LOCK_CR 1 /* concurrent read */
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#define DLM_LOCK_CW 2 /* concurrent write */
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#define DLM_LOCK_PR 3 /* protected read */
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#define DLM_LOCK_PW 4 /* protected write */
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#define DLM_LOCK_EX 5 /* exclusive */
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/*
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* Flags to dlm_lock
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*
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* DLM_LKF_NOQUEUE
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*
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* Do not queue the lock request on the wait queue if it cannot be granted
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* immediately. If the lock cannot be granted because of this flag, DLM will
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* either return -EAGAIN from the dlm_lock call or will return 0 from
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* dlm_lock and -EAGAIN in the lock status block when the AST is executed.
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*
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* DLM_LKF_CANCEL
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*
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* Used to cancel a pending lock request or conversion. A converting lock is
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* returned to its previously granted mode.
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*
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* DLM_LKF_CONVERT
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*
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* Indicates a lock conversion request. For conversions the name and namelen
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* are ignored and the lock ID in the LKSB is used to identify the lock.
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*
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* DLM_LKF_VALBLK
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*
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* Requests DLM to return the current contents of the lock value block in the
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* lock status block. When this flag is set in a lock conversion from PW or EX
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* modes, DLM assigns the value specified in the lock status block to the lock
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* value block of the lock resource. The LVB is a DLM_LVB_LEN size array
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* containing application-specific information.
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*
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* DLM_LKF_QUECVT
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*
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* Force a conversion request to be queued, even if it is compatible with
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* the granted modes of other locks on the same resource.
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*
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* DLM_LKF_IVVALBLK
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*
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* Invalidate the lock value block.
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*
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* DLM_LKF_CONVDEADLK
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*
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* Allows the dlm to resolve conversion deadlocks internally by demoting the
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* granted mode of a converting lock to NL. The DLM_SBF_DEMOTED flag is
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* returned for a conversion that's been effected by this.
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*
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* DLM_LKF_PERSISTENT
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*
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* Only relevant to locks originating in userspace. A persistent lock will not
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* be removed if the process holding the lock exits.
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*
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* DLM_LKF_NODLCKWT
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*
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* Do not cancel the lock if it gets into conversion deadlock.
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*
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* DLM_LKF_NODLCKBLK
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*
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* net yet implemented
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*
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* DLM_LKF_EXPEDITE
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*
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* Used only with new requests for NL mode locks. Tells the lock manager
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* to grant the lock, ignoring other locks in convert and wait queues.
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*
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* DLM_LKF_NOQUEUEBAST
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*
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* Send blocking AST's before returning -EAGAIN to the caller. It is only
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* used along with the NOQUEUE flag. Blocking AST's are not sent for failed
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* NOQUEUE requests otherwise.
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*
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* DLM_LKF_HEADQUE
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*
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* Add a lock to the head of the convert or wait queue rather than the tail.
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*
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* DLM_LKF_NOORDER
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*
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* Disregard the standard grant order rules and grant a lock as soon as it
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* is compatible with other granted locks.
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*
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* DLM_LKF_ORPHAN
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*
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* Acquire an orphan lock.
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*
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* DLM_LKF_ALTPR
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*
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* If the requested mode cannot be granted immediately, try to grant the lock
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* in PR mode instead. If this alternate mode is granted instead of the
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* requested mode, DLM_SBF_ALTMODE is returned in the lksb.
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*
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* DLM_LKF_ALTCW
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*
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* The same as ALTPR, but the alternate mode is CW.
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*
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* DLM_LKF_FORCEUNLOCK
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*
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* Unlock the lock even if it is converting or waiting or has sublocks.
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* Only really for use by the userland device.c code.
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*
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* DLM_LKF_TIMEOUT
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*
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* This value is deprecated and reserved. DO NOT USE!
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*
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*/
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#define DLM_LKF_NOQUEUE 0x00000001
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#define DLM_LKF_CANCEL 0x00000002
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#define DLM_LKF_CONVERT 0x00000004
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#define DLM_LKF_VALBLK 0x00000008
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#define DLM_LKF_QUECVT 0x00000010
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#define DLM_LKF_IVVALBLK 0x00000020
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#define DLM_LKF_CONVDEADLK 0x00000040
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#define DLM_LKF_PERSISTENT 0x00000080
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#define DLM_LKF_NODLCKWT 0x00000100
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#define DLM_LKF_NODLCKBLK 0x00000200
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#define DLM_LKF_EXPEDITE 0x00000400
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#define DLM_LKF_NOQUEUEBAST 0x00000800
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#define DLM_LKF_HEADQUE 0x00001000
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#define DLM_LKF_NOORDER 0x00002000
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#define DLM_LKF_ORPHAN 0x00004000
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#define DLM_LKF_ALTPR 0x00008000
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#define DLM_LKF_ALTCW 0x00010000
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#define DLM_LKF_FORCEUNLOCK 0x00020000
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#define DLM_LKF_TIMEOUT 0x00040000
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/*
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* Some return codes that are not in errno.h
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*/
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#define DLM_ECANCEL 0x10001
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#define DLM_EUNLOCK 0x10002
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#endif /* __DLMCONSTANTS_DOT_H__ */
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