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"
16 #include "afs/sysincludes.h" /* Standard vendor system headers */
17 #include "afsincludes.h" /* Afs-based standard headers */
18 #include "afs/afs_stats.h" /* statistics */
21 /* Try to discard pages, in order to recycle a vcache entry.
23 * We also make some sanity checks: ref count, open count, held locks.
25 * We also do some non-VM-related chores, such as releasing the cred pointer
26 * (for AIX and Solaris) and releasing the gnode (for AIX).
28 * Locking: afs_xvcache lock is held. If it is dropped and re-acquired,
29 * *slept should be set to warn the caller.
31 * Formerly, afs_xvcache was dropped and re-acquired for Solaris, but now it
32 * is not dropped and re-acquired for any platform. It may be that *slept is
33 * therefore obsolescent.
35 * OSF/1 Locking: VN_LOCK has been called.
38 osi_VM_FlushVCache(struct vcache *avc, int *slept)
40 struct vnode *vp = AFSTOV(avc);
41 #ifdef AFS_DARWIN14_ENV
42 if (UBCINFOEXISTS(vp))
51 /* if a lock is held, give up */
52 if (CheckLock(&avc->lock) || afs_CheckBozonLock(&avc->pvnLock))
57 #ifndef AFS_DARWIN14_ENV
58 if (UBCINFOEXISTS(vp)) {
65 /* This is literally clean_up_name_parent_ptrs() */
66 /* Critical to clean up any state attached to the vnode here since it's
67 being recycled, and we're not letting refcnt drop to 0 to trigger
69 if (VNAME(vp) || VPARENT(vp)) {
73 /* do it this way so we don't block before clearing
96 /* Try to store pages to cache, in order to store a file back to the server.
98 * Locking: the vcache entry's lock is held. It will usually be dropped and
102 osi_VM_StoreAllSegments(struct vcache *avc)
104 struct vnode *vp = AFSTOV(avc);
105 ReleaseWriteLock(&avc->lock);
107 if (UBCINFOEXISTS(vp)) {
111 ObtainWriteLock(&avc->lock, 94);
114 /* Try to invalidate pages, for "fs flush" or "fs flushv"; or
115 * try to free pages, when deleting a file.
117 * Locking: the vcache entry's lock is held. It may be dropped and
120 * Since we drop and re-obtain the lock, we can't guarantee that there won't
121 * be some pages around when we return, newly created by concurrent activity.
124 osi_VM_TryToSmush(struct vcache *avc, struct AFS_UCRED *acred, int sync)
126 struct vnode *vp = AFSTOV(avc);
131 ReleaseWriteLock(&avc->lock);
133 if (UBCINFOEXISTS(vp)) {
134 size = ubc_getsize(vp);
135 kret = ubc_invalidate(vp, 0, size);
136 if (kret != 1) /* should be KERN_SUCCESS */
137 printf("TryToSmush: invalidate failed (error = %d)\n", kret);
140 ObtainWriteLock(&avc->lock, 59);
143 /* Purge VM for a file when its callback is revoked.
145 * Locking: No lock is held, not even the global lock.
147 /* XXX this seems to not be referenced anywhere. *somebody* ought to be calling
148 this, and also making sure that ubc's idea of the filesize is right more
151 osi_VM_FlushPages(struct vcache *avc, struct AFS_UCRED *credp)
153 struct vnode *vp = AFSTOV(avc);
157 if (UBCINFOEXISTS(vp)) {
158 size = ubc_getsize(vp);
159 kret = ubc_invalidate(vp, 0, size);
160 if (kret != 1) /* Should be KERN_SUCCESS */
161 printf("VMFlushPages: invalidate failed (error = %d)\n", kret);
162 /* XXX what about when not CStatd */
163 if (avc->states & CStatd && size != avc->m.Length)
164 ubc_setsize(vp, avc->m.Length);
168 /* Purge pages beyond end-of-file, when truncating a file.
170 * Locking: no lock is held, not even the global lock.
171 * activeV is raised. This is supposed to block pageins, but at present
172 * it only works on Solaris.
175 osi_VM_Truncate(struct vcache *avc, int alen, struct AFS_UCRED *acred)
177 struct vnode *vp = AFSTOV(avc);
178 if (UBCINFOEXISTS(vp)) {
179 ubc_setsize(vp, alen);
183 /* vnreclaim and vinactive are probably not aggressive enough to keep
184 enough afs vcaches free, so we try to do some of it ourselves */
185 /* XXX there's probably not nearly enough locking here */
187 osi_VM_TryReclaim(struct vcache *avc, int *slept)
189 struct proc *p = current_proc();
190 struct vnode *vp = AFSTOV(avc);
195 VN_HOLD(vp); /* remove from inactive list */
196 if (!simple_lock_try(&vp->v_interlock)) {
200 if (!UBCINFOEXISTS(vp) || vp->v_count != 2) {
201 simple_unlock(&vp->v_interlock);
205 if (ISSET(vp->v_flag, VUINACTIVE)) {
206 simple_unlock(&vp->v_interlock);
208 printf("vnode %x still inactive!", vp);
211 #ifdef AFS_DARWIN14_ENV
212 if (vp->v_ubcinfo->ui_refcount > 1 || vp->v_ubcinfo->ui_mapped) {
213 simple_unlock(&vp->v_interlock);
218 if (vp->v_ubcinfo->ui_holdcnt) {
219 simple_unlock(&vp->v_interlock);
224 if (slept && ubc_issetflags(vp, UI_WASMAPPED)) {
225 /* We can't possibly release this in time for this NewVCache to get it */
226 simple_unlock(&vp->v_interlock);
231 vp->v_usecount--; /* we want the usecount to be 1 */
234 ReleaseWriteLock(&afs_xvcache);
237 ReleaseReadLock(&afs_xvcache);
240 if (ubc_issetflags(vp, UI_WASMAPPED)) {
241 simple_unlock(&vp->v_interlock);
242 #ifdef AFS_DARWIN14_ENV
243 ubc_release_named(vp);
247 if (ubc_issetflags(vp, UI_HASOBJREF))
248 printf("ubc_release didn't release the reference?!\n");
249 } else if (!vn_lock(vp, LK_EXCLUSIVE | LK_INTERLOCK, current_proc())) {
250 #ifdef AFS_DARWIN14_ENV
251 obj = ubc_getobject(vp, UBC_HOLDOBJECT);
253 #ifdef AFS_DARWIN13_ENV
254 obj = ubc_getobject(vp, (UBC_NOREACTIVATE | UBC_HOLDOBJECT));
256 obj = ubc_getobject(vp);
259 (void)ubc_clean(vp, 1);
260 vinvalbuf(vp, V_SAVE, &afs_osi_cred, p, 0, 0);
261 if (vp->v_usecount == 1)
264 VOP_UNLOCK(vp, 0, p);
266 if (ISSET(vp->v_flag, VTERMINATE))
267 panic("afs_vnreclaim: already teminating");
268 SET(vp->v_flag, VTERMINATE);
269 memory_object_destroy(obj, 0);
270 while (ISSET(vp->v_flag, VTERMINATE)) {
271 SET(vp->v_flag, VTERMWANT);
272 tsleep((caddr_t) & vp->v_ubcinfo, PINOD, "afs_vnreclaim", 0);
276 if (simple_lock_try(&vp->v_interlock))
277 panic("afs_vnreclaim: slept, but did no work :(");
278 if (UBCINFOEXISTS(vp) && vp->v_count == 1) {
280 simple_unlock(&vp->v_interlock);
283 simple_unlock(&vp->v_interlock);
287 ObtainWriteLock(&afs_xvcache, 175);
289 ObtainReadLock(&afs_xvcache);
293 osi_VM_NukePages(struct vnode *vp, off_t offset, off_t size)
296 struct vcache *avc = VTOAFS(vp);
298 #ifdef AFS_DARWIN14_ENV
299 offset = trunc_page(offset);
300 size = round_page(size + 1);
302 ubc_page_op(vp, (vm_offset_t) offset,
303 UPL_POP_SET | UPL_POP_BUSY | UPL_POP_DUMP, 0, 0);
309 #ifdef AFS_DARWIN13_ENV
310 if (UBCINFOEXISTS(vp))
311 object = ubc_getobject(vp, UBC_NOREACTIVATE);
313 if (UBCINFOEXISTS(vp))
314 object = ubc_getobject(vp);
319 offset = trunc_page(offset);
320 size = round_page(size + 1);
322 #ifdef AFS_DARWIN13_ENV
324 memory_object_page_op(object, (vm_offset_t) offset,
325 UPL_POP_SET | UPL_POP_BUSY | UPL_POP_DUMP, 0,
331 /* This is all we can do, and it's not enough. sucks to be us */
332 ubc_setsize(vp, offset);
333 size = (offset + size > avc->m.Length) ? offset + size : avc->m.Length;
334 ubc_setsize(vp, size);
340 osi_VM_Setup(struct vcache *avc, int force)
343 struct vnode *vp = AFSTOV(avc);
345 if (UBCISVALID(vp) && ((avc->states & CStatd) || force)) {
346 if (!UBCINFOEXISTS(vp) && !ISSET(vp->v_flag, VTERMINATE)) {
348 avc->states |= CUBCinit;
350 if ((error = ubc_info_init(&avc->v))) {
352 avc->states &= ~CUBCinit;
356 #ifndef AFS_DARWIN14_ENV
357 simple_lock(&avc->v.v_interlock);
358 if (!ubc_issetflags(&avc->v, UI_HASOBJREF))
359 #ifdef AFS_DARWIN13_ENV
361 (&avc->v, (UBC_NOREACTIVATE | UBC_HOLDOBJECT)))
362 panic("VM_Setup: null object");
364 (void)_ubc_getobject(&avc->v, 1); /* return value not used */
366 simple_unlock(&avc->v.v_interlock);
369 avc->states &= ~CUBCinit;
372 if (UBCINFOEXISTS(&avc->v))
373 ubc_setsize(&avc->v, avc->m.Length);