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"
25 #include "afs/sysincludes.h" /* Standard vendor system headers */
26 #include "afs/afsincludes.h" /* Afs-based standard headers */
27 #include "afs/afs_stats.h" /* statistics */
28 #include <sys/namei.h>
32 /* Try to discard pages, in order to recycle a vcache entry.
34 * We also make some sanity checks: ref count, open count, held locks.
36 * We also do some non-VM-related chores, such as releasing the cred pointer
37 * (for AIX and Solaris) and releasing the gnode (for AIX).
39 * Locking: afs_xvcache lock is held. If it is dropped and re-acquired,
40 * *slept should be set to warn the caller.
42 * Formerly, afs_xvcache was dropped and re-acquired for Solaris, but now it
43 * is not dropped and re-acquired for any platform. It may be that *slept is
44 * therefore obsolescent.
46 * OSF/1 Locking: VN_LOCK has been called.
49 osi_VM_FlushVCache(struct vcache *avc, int *slept)
51 struct vnode *vp = AFSTOV(avc);
64 /* Try to store pages to cache, in order to store a file back to the server.
66 * Locking: the vcache entry's lock is held. It will usually be dropped and
71 osi_VM_StoreAllSegments(struct vcache *avc)
75 /* Try to invalidate pages, for "fs flush" or "fs flushv"; or
76 * try to free pages, when deleting a file.
78 * Locking: the vcache entry's lock is held. It may be dropped and
81 * Since we drop and re-obtain the lock, we can't guarantee that there won't
82 * be some pages around when we return, newly created by concurrent activity.
85 osi_VM_TryToSmush(struct vcache *avc, afs_ucred_t *acred, int sync)
87 ReleaseWriteLock(&avc->lock);
88 osi_VM_FlushVCache(avc, NULL);
89 ObtainWriteLock(&avc->lock, 59);
92 /* Purge VM for a file when its callback is revoked.
94 * Locking: No lock is held, not even the global lock.
97 osi_VM_FlushPages(struct vcache *avc, afs_ucred_t *credp)
99 struct vnode *vp = AFSTOV(avc);
105 uvm_vnp_setsize(vp, avc->f.m.Length);
108 /* Purge pages beyond end-of-file, when truncating a file.
110 * Locking: no lock is held, not even the global lock.
111 * activeV is raised. This is supposed to block pageins, but at present
112 * it only works on Solaris.
115 osi_VM_Truncate(struct vcache *avc, int alen, afs_ucred_t *acred)
117 uvm_vnp_setsize(AFSTOV(avc), alen);