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
11 /* osi_vm.c implements:
13 * osi_VM_FlushVCache(avc, slept)
14 * osi_ubc_flush_dirty_and_wait(vp, flags)
15 * osi_VM_StoreAllSegments(avc)
16 * osi_VM_TryToSmush(avc, acred, sync)
17 * osi_VM_FlushPages(avc, credp)
18 * osi_VM_Truncate(avc, alen, acred)
21 #include <afsconfig.h>
22 #include "afs/param.h"
27 #include "afs/sysincludes.h" /* Standard vendor system headers */
28 #include "afs/afsincludes.h" /* Afs-based standard headers */
29 #include "afs/afs_stats.h" /* statistics */
30 /* #include <vm/vm_ubc.h> */
34 /* Try to discard pages, in order to recycle a vcache entry.
36 * We also make some sanity checks: ref count, open count, held locks.
38 * We also do some non-VM-related chores, such as releasing the cred pointer
39 * (for AIX and Solaris) and releasing the gnode (for AIX).
41 * Locking: afs_xvcache lock is held. If it is dropped and re-acquired,
42 * *slept should be set to warn the caller.
44 * Formerly, afs_xvcache was dropped and re-acquired for Solaris, but now it
45 * is not dropped and re-acquired for any platform. It may be that *slept is
46 * therefore obsolescent.
48 * OSF/1 Locking: VN_LOCK has been called.
51 osi_VM_FlushVCache(struct vcache *avc, int *slept)
56 /* Try to store pages to cache, in order to store a file back to the server.
58 * Locking: the vcache entry's lock is held. It will usually be dropped and
62 osi_VM_StoreAllSegments(struct vcache *avc)
66 /* Try to invalidate pages, for "fs flush" or "fs flushv"; or
67 * try to free pages, when deleting a file.
69 * Locking: the vcache entry's lock is held. It may be dropped and
72 * Since we drop and re-obtain the lock, we can't guarantee that there won't
73 * be some pages around when we return, newly created by concurrent activity.
76 osi_VM_TryToSmush(struct vcache *avc, struct AFS_UCRED *acred, int sync)
80 /* Purge VM for a file when its callback is revoked.
82 * Locking: No lock is held, not even the global lock.
85 osi_VM_FlushPages(struct vcache *avc, struct AFS_UCRED *credp)
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, struct AFS_UCRED *acred)