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"
24 #include "afs/sysincludes.h" /* Standard vendor system headers */
25 #include "afs/afsincludes.h" /* Afs-based standard headers */
26 #include "afs/afs_stats.h" /* statistics */
28 /* Try to discard pages, in order to recycle a vcache entry.
30 * We also make some sanity checks: ref count, open count, held locks.
32 * We also do some non-VM-related chores, such as releasing the cred pointer
33 * (for AIX and Solaris) and releasing the gnode (for AIX).
35 * Locking: afs_xvcache lock is held. If it is dropped and re-acquired,
36 * *slept should be set to warn the caller.
38 * Formerly, afs_xvcache was dropped and re-acquired for Solaris, but now it
39 * is not dropped and re-acquired for any platform. It may be that *slept is
40 * therefore obsolescent.
42 * OSF/1 Locking: VN_LOCK has been called.
45 osi_VM_FlushVCache(struct vcache *avc, int *slept)
47 struct vnode *vp = AFSTOV(avc);
49 if ((afs_debug & AFSDEB_VNLAYER) != 0) {
50 printf("%s enter\n", __func__);
54 printf("%s NULL vp\n", __func__);
63 if ((afs_debug & AFSDEB_VNLAYER) != 0) {
64 printf("%s exit\n", __func__);
70 /* Try to store pages to cache, in order to store a file back to the server.
72 * Locking: the vcache entry's lock is held. It will usually be dropped and
76 osi_VM_StoreAllSegments(struct vcache *avc)
80 if ((afs_debug & AFSDEB_VNLAYER) != 0) {
81 printf("%s enter\n", __func__);
84 ReleaseWriteLock(&avc->lock);
87 mutex_enter(&vp->v_interlock);
88 VOP_PUTPAGES(vp, 0, 0, PGO_ALLPAGES|PGO_CLEANIT|PGO_SYNCIO);
90 ObtainWriteLock(&avc->lock, 94);
91 if ((afs_debug & AFSDEB_VNLAYER) != 0) {
92 printf("%s exit\n", __func__);
96 /* Try to invalidate pages, for "fs flush" or "fs flushv"; or
97 * try to free pages, when deleting a file.
99 * Locking: the vcache entry's lock is held. It may be dropped and
102 * Since we drop and re-obtain the lock, we can't guarantee that there won't
103 * be some pages around when we return, newly created by concurrent activity.
106 osi_VM_TryToSmush(struct vcache *avc, afs_ucred_t *acred, int sync)
108 if ((afs_debug & AFSDEB_VNLAYER) != 0) {
109 printf("%s enter\n", __func__);
112 ReleaseWriteLock(&avc->lock);
113 osi_VM_FlushVCache(avc, NULL);
114 ObtainWriteLock(&avc->lock, 59);
116 if ((afs_debug & AFSDEB_VNLAYER) != 0) {
117 printf("%s exit\n", __func__);
121 /* Purge VM for a file when its callback is revoked.
123 * Locking: No lock is held, not even the global lock.
126 osi_VM_FlushPages(struct vcache *avc, afs_ucred_t *credp)
128 struct vnode *vp = AFSTOV(avc);
130 if ((afs_debug & AFSDEB_VNLAYER) != 0) {
131 printf("%s enter\n", __func__);
135 printf("%s NULL vp\n", __func__);
140 vinvalbuf(vp, 0, credp, curlwp, false, 1);
142 if ((afs_debug & AFSDEB_VNLAYER) != 0) {
143 printf("%s exit\n", __func__);
147 /* Purge pages beyond end-of-file, when truncating a file.
149 * Locking: no lock is held, not even the global lock.
150 * activeV is raised. This is supposed to block pageins, but at present
151 * it only works on Solaris.
154 osi_VM_Truncate(struct vcache *avc, voff_t alen, afs_ucred_t *acred)
156 struct vnode *vp = AFSTOV(avc);
158 if ((afs_debug & AFSDEB_VNLAYER) != 0) {
159 printf("%s enter\n", __func__);
162 vtruncbuf(vp, alen, false, 0);
164 if ((afs_debug & AFSDEB_VNLAYER) != 0) {
165 printf("%s exit\n", __func__);