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
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. */
27 #include <vm/seg_map.h>
28 #include <vm/seg_vn.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.
44 osi_VM_GetDownD(struct vcache
*avc
, struct dcache
*adc
)
50 afs_putpage(AFSTOV(avc
), (offset_t
) AFS_CHUNKTOBASE(adc
->f
.chunk
),
51 AFS_CHUNKTOSIZE(adc
->f
.chunk
), B_INVAL
, CRED());
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)
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)) {
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.
95 osi_VM_FlushVCache(struct vcache
*avc
)
97 if (avc
->vrefCount
!= 0)
103 /* if a lock is held, give up */
104 if (CheckLock(&avc
->lock
))
108 pvn_vplist_dirty(AFSTOV(avc
), 0, NULL
, B_TRUNC
| B_INVAL
, CRED());
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
);
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
131 osi_VM_StoreAllSegments(struct vcache
*avc
)
134 (void)pvn_vplist_dirty(AFSTOV(avc
), (u_offset_t
) 0, afs_putapage
, 0,
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
146 osi_VM_TryToSmush(struct vcache
*avc
, afs_ucred_t
*acred
, int sync
)
149 (void)pvn_vplist_dirty(AFSTOV(avc
), (u_offset_t
) 0, afs_putapage
,
150 (sync
? B_INVAL
: B_FREE
), acred
);
154 /* Purge VM for a file when its callback is revoked.
156 * Locking: No lock is held, not even the global lock.
159 osi_VM_FlushPages(struct vcache
*avc
, afs_ucred_t
*credp
)
161 extern int 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.
176 osi_VM_PreTruncate(struct vcache
*avc
, int alen
, afs_ucred_t
*acred
)
179 int pageOffset
= (alen
& PAGEOFFSET
);
181 if (pageOffset
== 0) {
185 ReleaseWriteLock(&avc
->lock
);
187 pp
= page_lookup(AFSTOV(avc
), alen
- pageOffset
, SE_EXCL
);
189 pagezero(pp
, pageOffset
, PAGESIZE
- pageOffset
);
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).
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
,