Merge 1.8.0~pre4 packaging into master
[pkg-k5-afs_openafs.git] / src / afs / SOLARIS / osi_vm.c
blob99f1439c24e031458417c908868b7578ac6aabe0
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 */
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 */
17 #include "afs/nfsclient.h"
19 /* This file contains Solaris VM-related code for the cache manager. */
21 #include <sys/mman.h>
22 #include <vm/hat.h>
23 #include <vm/as.h>
24 #include <vm/page.h>
25 #include <vm/pvn.h>
26 #include <vm/seg.h>
27 #include <vm/seg_map.h>
28 #include <vm/seg_vn.h>
29 #include <vm/rm.h>
30 #include <sys/modctl.h>
31 #include <sys/syscall.h>
32 #include <sys/debug.h>
33 #include <sys/fs_subr.h>
35 /* Try to invalidate pages, in order to recycle a dcache entry.
37 * This function only exists for Solaris. For other platforms, it's OK to
38 * recycle a dcache entry without invalidating pages, because the strategy
39 * function can call afs_GetDCache().
41 * Locking: only the global lock is held on entry.
43 int
44 osi_VM_GetDownD(struct vcache *avc, struct dcache *adc)
46 int code;
48 AFS_GUNLOCK();
49 code =
50 afs_putpage(AFSTOV(avc), (offset_t) AFS_CHUNKTOBASE(adc->f.chunk),
51 AFS_CHUNKTOSIZE(adc->f.chunk), B_INVAL, CRED());
52 AFS_GLOCK();
54 return code;
57 /* Does this dcache conflict with a multiPage request for this vcache?
59 * This function only exists for Solaris. This is used by afs_GetDownD to
60 * calculate if trying to evict the given dcache may deadlock with an
61 * in-progress afs_getpage call that is trying to get more than one page at
62 * once. See afs_getpage for details. We return 0 if we do NOT conflict,
63 * nonzero otherwise. If we return nonzero, we should NOT try to evict the
64 * given dcache entry from the cache.
66 * Locking: tvc->vlock is write-locked on entry (and GLOCK is held)
68 int
69 osi_VM_MultiPageConflict(struct vcache *avc, struct dcache *adc)
71 struct multiPage_range *range;
72 for (range = (struct multiPage_range *)avc->multiPage.next;
73 range != &avc->multiPage;
74 range = (struct multiPage_range *)QNext(&range->q)) {
76 if (adc->f.chunk >= AFS_CHUNK(range->off) &&
77 adc->f.chunk <= AFS_CHUNK(range->off + range->len - 1)) {
78 return 1;
82 return 0;
85 /* Try to discard pages, in order to recycle a vcache entry.
87 * We also make some sanity checks: ref count, open count, held locks.
89 * We also do some non-VM-related chores, such as releasing the cred pointer
90 * (for AIX and Solaris) and releasing the gnode (for AIX).
92 * Locking: afs_xvcache lock is held. It must not be dropped.
94 int
95 osi_VM_FlushVCache(struct vcache *avc)
97 if (avc->vrefCount != 0)
98 return EBUSY;
100 if (avc->opens)
101 return EBUSY;
103 /* if a lock is held, give up */
104 if (CheckLock(&avc->lock))
105 return EBUSY;
107 AFS_GUNLOCK();
108 pvn_vplist_dirty(AFSTOV(avc), 0, NULL, B_TRUNC | B_INVAL, CRED());
109 AFS_GLOCK();
111 /* Might as well make the obvious check */
112 if (AFSTOV(avc)->v_pages)
113 return EBUSY; /* should be all gone still */
115 rw_destroy(&avc->rwlock);
116 if (avc->credp) {
117 crfree(avc->credp);
118 avc->credp = NULL;
122 return 0;
125 /* Try to store pages to cache, in order to store a file back to the server.
127 * Locking: the vcache entry's lock is held. It will usually be dropped and
128 * re-obtained.
130 void
131 osi_VM_StoreAllSegments(struct vcache *avc)
133 AFS_GUNLOCK();
134 (void)pvn_vplist_dirty(AFSTOV(avc), (u_offset_t) 0, afs_putapage, 0,
135 CRED());
136 AFS_GLOCK();
139 /* Try to invalidate pages, for "fs flush" or "fs flushv"; or
140 * try to free pages, when deleting a file.
142 * Locking: the vcache entry's lock is held. It may be dropped and
143 * re-obtained.
145 void
146 osi_VM_TryToSmush(struct vcache *avc, afs_ucred_t *acred, int sync)
148 AFS_GUNLOCK();
149 (void)pvn_vplist_dirty(AFSTOV(avc), (u_offset_t) 0, afs_putapage,
150 (sync ? B_INVAL : B_FREE), acred);
151 AFS_GLOCK();
154 /* Purge VM for a file when its callback is revoked.
156 * Locking: No lock is held, not even the global lock.
158 void
159 osi_VM_FlushPages(struct vcache *avc, afs_ucred_t *credp)
161 extern int afs_pvn_vptrunc;
163 afs_pvn_vptrunc++;
164 (void)afs_putpage(AFSTOV(avc), (offset_t) 0, 0, B_TRUNC | B_INVAL, credp);
167 /* Zero no-longer-used part of last page, when truncating a file
169 * This function only exists for Solaris. Other platforms do not support it.
171 * Locking: the vcache entry lock is held. It is released and re-obtained.
172 * The caller will raise activeV (to prevent pageins), but this function must
173 * be called first, since it causes a pagein.
175 void
176 osi_VM_PreTruncate(struct vcache *avc, int alen, afs_ucred_t *acred)
178 page_t *pp;
179 int pageOffset = (alen & PAGEOFFSET);
181 if (pageOffset == 0) {
182 return;
185 ReleaseWriteLock(&avc->lock);
186 AFS_GUNLOCK();
187 pp = page_lookup(AFSTOV(avc), alen - pageOffset, SE_EXCL);
188 if (pp) {
189 pagezero(pp, pageOffset, PAGESIZE - pageOffset);
190 page_unlock(pp);
192 AFS_GLOCK();
193 ObtainWriteLock(&avc->lock, 563);
196 /* Purge pages beyond end-of-file, when truncating a file.
198 * Locking: no lock is held, not even the global lock.
199 * Pageins are blocked (activeV is raised).
201 void
202 osi_VM_Truncate(struct vcache *avc, int alen, afs_ucred_t *acred)
205 * It's OK to specify afs_putapage here, even though we aren't holding
206 * the vcache entry lock, because it isn't going to get called.
208 pvn_vplist_dirty(AFSTOV(avc), alen, afs_putapage, B_TRUNC | B_INVAL,
209 acred);