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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 | ||
11 | /* osi_vm.c implements: | |
12 | * | |
13 | * osi_VM_FlushVCache(avc) | |
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) | |
19 | */ | |
20 | ||
21 | #include <afsconfig.h> | |
22 | #include "afs/param.h" | |
23 | ||
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 */ | |
27 | ||
28 | /* Try to discard pages, in order to recycle a vcache entry. | |
29 | * | |
30 | * We also make some sanity checks: ref count, open count, held locks. | |
31 | * | |
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). | |
34 | * | |
35 | * Locking: afs_xvcache lock is held. It must not be dropped. | |
36 | * | |
37 | * OSF/1 Locking: VN_LOCK has been called. | |
38 | */ | |
39 | int | |
40 | osi_VM_FlushVCache(struct vcache *avc) | |
41 | { | |
42 | struct vnode *vp = AFSTOV(avc); | |
43 | ||
44 | if ((afs_debug & AFSDEB_VNLAYER) != 0) { | |
45 | printf("%s enter\n", __func__); | |
46 | } | |
47 | ||
48 | if (vp == NULL) { | |
49 | printf("%s NULL vp\n", __func__); | |
50 | return 0; | |
51 | } | |
52 | ||
53 | AFS_GUNLOCK(); | |
54 | cache_purge(vp); | |
55 | vflushbuf(vp, 1); | |
56 | AFS_GLOCK(); | |
57 | ||
58 | if ((afs_debug & AFSDEB_VNLAYER) != 0) { | |
59 | printf("%s exit\n", __func__); | |
60 | } | |
61 | ||
62 | return 0; | |
63 | } | |
64 | ||
65 | /* Try to store pages to cache, in order to store a file back to the server. | |
66 | * | |
67 | * Locking: the vcache entry's lock is held. It will usually be dropped and | |
68 | * re-obtained. | |
69 | */ | |
70 | void | |
71 | osi_VM_StoreAllSegments(struct vcache *avc) | |
72 | { | |
73 | struct vnode *vp; | |
74 | ||
75 | if ((afs_debug & AFSDEB_VNLAYER) != 0) { | |
76 | printf("%s enter\n", __func__); | |
77 | } | |
78 | ||
79 | ReleaseWriteLock(&avc->lock); | |
80 | AFS_GUNLOCK(); | |
81 | vp = AFSTOV(avc); | |
82 | mutex_enter(&vp->v_interlock); | |
83 | VOP_PUTPAGES(vp, 0, 0, PGO_ALLPAGES|PGO_CLEANIT|PGO_SYNCIO); | |
84 | AFS_GLOCK(); | |
85 | ObtainWriteLock(&avc->lock, 94); | |
86 | if ((afs_debug & AFSDEB_VNLAYER) != 0) { | |
87 | printf("%s exit\n", __func__); | |
88 | } | |
89 | } | |
90 | ||
91 | /* Try to invalidate pages, for "fs flush" or "fs flushv"; or | |
92 | * try to free pages, when deleting a file. | |
93 | * | |
94 | * Locking: the vcache entry's lock is held. It may be dropped and | |
95 | * re-obtained. | |
96 | * | |
97 | * Since we drop and re-obtain the lock, we can't guarantee that there won't | |
98 | * be some pages around when we return, newly created by concurrent activity. | |
99 | */ | |
100 | void | |
101 | osi_VM_TryToSmush(struct vcache *avc, afs_ucred_t *acred, int sync) | |
102 | { | |
103 | if ((afs_debug & AFSDEB_VNLAYER) != 0) { | |
104 | printf("%s enter\n", __func__); | |
105 | } | |
106 | ||
107 | ReleaseWriteLock(&avc->lock); | |
108 | osi_VM_FlushVCache(avc); | |
109 | ObtainWriteLock(&avc->lock, 59); | |
110 | ||
111 | if ((afs_debug & AFSDEB_VNLAYER) != 0) { | |
112 | printf("%s exit\n", __func__); | |
113 | } | |
114 | } | |
115 | ||
116 | /* Purge VM for a file when its callback is revoked. | |
117 | * | |
118 | * Locking: No lock is held, not even the global lock. | |
119 | */ | |
120 | void | |
121 | osi_VM_FlushPages(struct vcache *avc, afs_ucred_t *credp) | |
122 | { | |
123 | struct vnode *vp = AFSTOV(avc); | |
124 | ||
125 | if ((afs_debug & AFSDEB_VNLAYER) != 0) { | |
126 | printf("%s enter\n", __func__); | |
127 | } | |
128 | ||
129 | if (!vp) { | |
130 | printf("%s NULL vp\n", __func__); | |
131 | return; | |
132 | } | |
133 | ||
134 | cache_purge(vp); | |
135 | vinvalbuf(vp, 0, credp, curlwp, false, 1); | |
136 | ||
137 | if ((afs_debug & AFSDEB_VNLAYER) != 0) { | |
138 | printf("%s exit\n", __func__); | |
139 | } | |
140 | } | |
141 | ||
142 | /* Purge pages beyond end-of-file, when truncating a file. | |
143 | * | |
144 | * Locking: no lock is held, not even the global lock. | |
145 | * activeV is raised. This is supposed to block pageins, but at present | |
146 | * it only works on Solaris. | |
147 | */ | |
148 | void | |
149 | osi_VM_Truncate(struct vcache *avc, voff_t alen, afs_ucred_t *acred) | |
150 | { | |
151 | struct vnode *vp = AFSTOV(avc); | |
152 | ||
153 | if ((afs_debug & AFSDEB_VNLAYER) != 0) { | |
154 | printf("%s enter\n", __func__); | |
155 | } | |
156 | ||
157 | vtruncbuf(vp, alen, false, 0); | |
158 | ||
159 | if ((afs_debug & AFSDEB_VNLAYER) != 0) { | |
160 | printf("%s exit\n", __func__); | |
161 | } | |
162 | } |