2 * Copyright 2000, International Business Machines Corporation and others.
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
10 #include <afsconfig.h>
11 #include "afs/param.h"
14 #include "afs/sysincludes.h" /* Standard vendor system headers */
15 #include "afsincludes.h" /* Afs-based standard headers */
16 #include "afs/afs_stats.h" /* statistics */
18 /* Try to discard pages, in order to recycle a vcache entry.
20 * We also make some sanity checks: ref count, open count, held locks.
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).
25 * Locking: afs_xvcache lock is held. If it is dropped and re-acquired,
26 * *slept should be set to warn the caller.
28 * Formerly, afs_xvcache was dropped and re-acquired for Solaris, but now it
29 * is not dropped and re-acquired for any platform. It may be that *slept is
30 * therefore obsolescent.
33 osi_VM_FlushVCache(struct vcache *avc, int *slept)
35 if (avc->vrefCount > 1)
44 /* Try to store pages to cache, in order to store a file back to the server.
46 * Locking: the vcache entry's lock is held. It will usually be dropped and
50 osi_VM_StoreAllSegments(struct vcache *avc)
52 ; /* Nothing here yet */
55 /* Try to invalidate pages, for "fs flush" or "fs flushv"; or
56 * try to free pages, when deleting a file.
58 * Locking: the vcache entry's lock is held. It may be dropped and
62 osi_VM_TryToSmush(struct vcache *avc, afs_ucred_t *acred, int sync)
64 struct vnode *vp = AFSTOV(avc);
66 /* Flush the delayed write blocks associated with this vnode
67 * from the buffer cache
69 if ((vp->v_flag & VTEXT) == 0) {
72 /* Mark the cached blocks on the free list as invalid; it invalidates blocks
73 * associated with vp which are on the freelist.
79 /* Purge VM for a file when its callback is revoked.
81 * Locking: No lock is held, not even the global lock.
84 osi_VM_FlushPages(struct vcache *avc, afs_ucred_t *credp)
86 ; /* Nothing here yet */
89 /* Purge pages beyond end-of-file, when truncating a file.
91 * Locking: no lock is held, not even the global lock.
92 * activeV is raised. This is supposed to block pageins, but at present
93 * it only works on Solaris.
96 osi_VM_Truncate(struct vcache *avc, int alen, afs_ucred_t *acred)
98 ; /* Nothing here yet */