[hcoop/debian/openafs.git] / src / afs / HPUX / osi_vm.c

/*
 * Copyright 2000, International Business Machines Corporation and others.
 * All Rights Reserved.
 * 
 * This software has been released under the terms of the IBM Public
 * License.  For details, see the LICENSE file in the top-level source
 * directory or online at http://www.openafs.org/dl/license10.html
 */

#include <afsconfig.h>
#include "afs/param.h"


#include "afs/sysincludes.h"	/* Standard vendor system headers */
#include "afsincludes.h"	/* Afs-based standard headers */
#include "afs/afs_stats.h"	/* statistics */

/* Try to discard pages, in order to recycle a vcache entry.
 *
 * We also make some sanity checks:  ref count, open count, held locks.
 *
 * We also do some non-VM-related chores, such as releasing the cred pointer
 * (for AIX and Solaris) and releasing the gnode (for AIX).
 *
 * Locking:  afs_xvcache lock is held. It must not be dropped.
 */
int
osi_VM_FlushVCache(struct vcache *avc)
{
    if (avc->vrefCount > 1)
	return EBUSY;

    if (avc->opens)
	return EBUSY;

    return 0;
}

/* Try to store pages to cache, in order to store a file back to the server.
 *
 * Locking:  the vcache entry's lock is held.  It will usually be dropped and
 * re-obtained.
 */
void
osi_VM_StoreAllSegments(struct vcache *avc)
{
    ;				/* Nothing here yet */
}

/* Try to invalidate pages, for "fs flush" or "fs flushv"; or
 * try to free pages, when deleting a file.
 *
 * Locking:  the vcache entry's lock is held.  It may be dropped and 
 * re-obtained.
 */
void
osi_VM_TryToSmush(struct vcache *avc, afs_ucred_t *acred, int sync)
{
    struct vnode *vp = AFSTOV(avc);

    /* Flush the delayed write blocks associated with this vnode
     * from the buffer cache
     */
    if ((vp->v_flag & VTEXT) == 0) {
	mpurge(vp);
    }
    /* Mark the cached blocks on the free list as invalid; it invalidates blocks
     * associated with vp which are on the freelist.
     */
    binvalfree(vp);
    mpurge(vp);
}

/* Purge VM for a file when its callback is revoked.
 *
 * Locking:  No lock is held, not even the global lock.
 */
void
osi_VM_FlushPages(struct vcache *avc, afs_ucred_t *credp)
{
    ;				/* Nothing here yet */
}

/* Purge pages beyond end-of-file, when truncating a file.
 *
 * Locking:  no lock is held, not even the global lock.
 * activeV is raised.  This is supposed to block pageins, but at present
 * it only works on Solaris.
 */
void
osi_VM_Truncate(struct vcache *avc, int alen, afs_ucred_t *acred)
{
    ;				/* Nothing here yet */
}
Commit	Line	Data
805e021f CE	1	/*
	2	* Copyright 2000, International Business Machines Corporation and others.
	3	* All Rights Reserved.
	4	*
	5	* This software has been released under the terms of the IBM Public
	6	* License. For details, see the LICENSE file in the top-level source
	7	* directory or online at http://www.openafs.org/dl/license10.html
	8	*/
	9
	10	#include <afsconfig.h>
	11	#include "afs/param.h"
	12
	13
	14	#include "afs/sysincludes.h" /* Standard vendor system headers */
	15	#include "afsincludes.h" /* Afs-based standard headers */
	16	#include "afs/afs_stats.h" /* statistics */
	17
	18	/* Try to discard pages, in order to recycle a vcache entry.
	19	*
	20	* We also make some sanity checks: ref count, open count, held locks.
	21	*
	22	* We also do some non-VM-related chores, such as releasing the cred pointer
	23	* (for AIX and Solaris) and releasing the gnode (for AIX).
	24	*
	25	* Locking: afs_xvcache lock is held. It must not be dropped.
	26	*/
	27	int
	28	osi_VM_FlushVCache(struct vcache *avc)
	29	{
	30	if (avc->vrefCount > 1)
	31	return EBUSY;
	32
	33	if (avc->opens)
	34	return EBUSY;
	35
	36	return 0;
	37	}
	38
	39	/* Try to store pages to cache, in order to store a file back to the server.
	40	*
	41	* Locking: the vcache entry's lock is held. It will usually be dropped and
	42	* re-obtained.
	43	*/
	44	void
	45	osi_VM_StoreAllSegments(struct vcache *avc)
	46	{
	47	; /* Nothing here yet */
	48	}
	49
	50	/* Try to invalidate pages, for "fs flush" or "fs flushv"; or
	51	* try to free pages, when deleting a file.
	52	*
	53	* Locking: the vcache entry's lock is held. It may be dropped and
	54	* re-obtained.
	55	*/
	56	void
	57	osi_VM_TryToSmush(struct vcache avc, afs_ucred_t acred, int sync)
	58	{
	59	struct vnode *vp = AFSTOV(avc);
	60
	61	/* Flush the delayed write blocks associated with this vnode
	62	* from the buffer cache
	63	*/
	64	if ((vp->v_flag & VTEXT) == 0) {
65	mpurge(vp);
66	}
67	/* Mark the cached blocks on the free list as invalid; it invalidates blocks
68	* associated with vp which are on the freelist.
69	*/
70	binvalfree(vp);
71	mpurge(vp);
72	}
73
74	/* Purge VM for a file when its callback is revoked.
75	*
76	* Locking: No lock is held, not even the global lock.
77	*/
78	void
79	osi_VM_FlushPages(struct vcache avc, afs_ucred_t credp)
80	{
81	; /* Nothing here yet */
82	}
83
84	/* Purge pages beyond end-of-file, when truncating a file.
85	*
86	* Locking: no lock is held, not even the global lock.
87	* activeV is raised. This is supposed to block pageins, but at present
88	* it only works on Solaris.
89	*/
90	void
91	osi_VM_Truncate(struct vcache avc, int alen, afs_ucred_t acred)
92	{
93	; /* Nothing here yet */
94	}