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 "../afs/param.h" /* Should be always first */
11 #include "../afs/sysincludes.h" /* Standard vendor system headers */
12 #include "../afs/afsincludes.h" /* Afs-based standard headers */
13 #include "../afs/afs_stats.h" /* statistics */
14 #include "sys/flock.h" /* for IGN_PID */
16 extern struct vnodeops Afs_vnodeops;
18 /* Try to discard pages, in order to recycle a vcache entry.
20 * We also make some sanity checks: ref count, open count, held locks.
22 * We also do some non-VM-related chores, such as releasing the cred pointer
23 * (for AIX and Solaris) and releasing the gnode (for AIX).
25 * Locking: afs_xvcache lock is held. If it is dropped and re-acquired,
26 * *slept should be set to warn the caller.
28 * Formerly, afs_xvcache was dropped and re-acquired for Solaris, but now it
29 * is not dropped and re-acquired for any platform. It may be that *slept is
30 * therefore obsolescent.
33 osi_VM_FlushVCache(avc, slept)
38 vnode_t *vp = &avc->v;
40 if (avc->vrefCount != 0)
47 * Just in case someone is still referring to the vnode we give up
48 * trying to get rid of this guy.
50 if (CheckLock(&avc->lock) || LockWaiters(&avc->lock))
56 * we just need to avoid the race
57 * in vn_rele between the ref count going to 0 and VOP_INACTIVE
59 * Note that although we checked vcount above, we didn't have the lock
61 if (vp->v_count > 0 || (vp->v_flag & VINACT)) {
68 * Since we store on last close and on VOP_INACTIVE
69 * there should be NO dirty pages
70 * Note that we hold the xvcache lock the entire time.
73 PTOSSVP(vp, (off_t)0, (off_t)MAXLONG);
76 /* afs_chkpgoob will drop and re-acquire the global lock. */
78 osi_Assert(!VN_GET_PGCNT(vp));
79 osi_Assert(!AFS_VN_MAPPED(vp));
80 osi_Assert(!AFS_VN_DIRTY(&avc->v));
82 #if defined(AFS_SGI65_ENV)
84 cleanlocks(vp, IGN_PID, 0);
85 mutex_destroy(&vp->v_filocksem);
86 #else /* AFS_SGI65_ENV */
87 if (vp->v_filocksem) {
90 cleanlocks(vp, &curprocp->p_flid);
92 cleanlocks(vp, IGN_PID, 0);
94 osi_Assert(vp->v_filocks == NULL);
95 mutex_destroy(vp->v_filocksem);
96 kmem_free(vp->v_filocksem, sizeof *vp->v_filocksem);
97 vp->v_filocksem = NULL;
99 #endif /* AFS_SGI65_ENV */
101 if (avc->vrefCount) osi_Panic("flushVcache: vm race");
104 vnode_pcache_reclaim(vp); /* this can sleep */
105 vnode_pcache_free(vp);
106 if (vp->v_op != &Afs_vnodeops) {
107 VOP_RECLAIM(vp, FSYNC_WAIT, code);
112 ktrace_free(vp->v_trace);
113 #endif /* VNODE_TRACING */
114 vn_bhv_remove(VN_BHV_HEAD(vp), &(avc->vc_bhv_desc));
115 vn_bhv_head_destroy(&(vp->v_bh));
116 destroy_bitlock(&vp->v_pcacheflag);
117 mutex_destroy(&vp->v_buf_lock);
119 bhv_remove(VN_BHV_HEAD(vp), &(avc->vc_bhv_desc));
120 bhv_head_destroy(&(vp->v_bh));
122 vp->v_flag = 0; /* debug */
123 #if defined(DEBUG) && defined(VNODE_INIT_BITLOCK)
124 destroy_bitlock(&vp->v_flag);
127 AFS_VN_DESTROY_BUF_LOCK(vp);
129 #endif /* AFS_SGI64_ENV */
134 /* Try to invalidate pages, for "fs flush" or "fs flushv"; or
135 * try to free pages, when deleting a file.
137 * Locking: the vcache entry's lock is held. It may be dropped and
140 * Since we drop and re-obtain the lock, we can't guarantee that there won't
141 * be some pages around when we return, newly created by concurrent activity.
144 osi_VM_TryToSmush(avc, acred, sync)
146 struct AFS_UCRED *acred;
149 ReleaseWriteLock(&avc->lock);
151 /* current remapf restriction - cannot have VOP_RWLOCK */
152 osi_Assert(OSI_GET_LOCKID() != avc->vc_rwlockid);
153 if (((vnode_t *)avc)->v_type == VREG && AFS_VN_MAPPED(((vnode_t *)avc)))
154 remapf(((vnode_t *)avc), 0, 0);
155 PTOSSVP((struct vnode *)avc, (off_t)0, (off_t)MAXLONG);
157 ObtainWriteLock(&avc->lock,62);
160 /* Flush and invalidate pages, for fsync() with INVAL flag
162 * Locking: only the global lock is held.
165 osi_VM_FSyncInval(avc)
169 PFLUSHINVALVP((vnode_t *)avc, (off_t)0, (off_t)avc->m.Length);
173 /* Try to store pages to cache, in order to store a file back to the server.
175 * Locking: the vcache entry's lock is held. It will usually be dropped and
179 osi_VM_StoreAllSegments(avc)
183 osi_Assert(valusema(&avc->vc_rwlock) <= 0);
184 osi_Assert(OSI_GET_LOCKID() == avc->vc_rwlockid);
185 osi_Assert(avc->vrefCount > 0);
186 ReleaseWriteLock(&avc->lock);
187 /* We may call back into AFS via:
188 * pflushvp->chunkpush->do_pdflush->mp_afs_bmap
192 /* Write out dirty pages list to avoid B_DELWRI buffers. */
193 while (VN_GET_DPAGES((vnode_t*)avc)) {
194 pdflush((struct vnode*)avc, 0);
197 PFLUSHVP((struct vnode *)avc, (off_t)avc->m.Length, (off_t)0, error);
201 * If this fails (due to quota overage, etc.)
202 * what can we do?? we need to sure that
203 * that the VM cache is cleared of dirty pages
204 * We note that pinvalfree ignores write errors & otherwise
205 * does what we want (we don't use this normally since
206 * it also unhashes pages ..)
208 PINVALFREE((vnode_t *)avc, avc->m.Length);
210 ObtainWriteLock(&avc->lock,121);
211 if (error && avc->m.LinkCount)
212 cmn_err(CE_WARN, "AFS:Failed to push back pages for vnode 0x%x error %d (from afs_StoreOnLastReference)",
216 /* Purge VM for a file when its callback is revoked.
218 * Locking: No lock is held, not even the global lock.
221 osi_VM_FlushPages(avc, credp)
223 struct AFS_UCRED *credp;
225 vnode_t *vp = (vnode_t *)avc;
227 remapf(vp, /*avc->m.Length*/ 0, 0);
229 /* Used to grab locks and recheck avc->m.DataVersion and
230 * avc->execsOrWriters here, but we have to drop locks before calling
231 * ptossvp() anyway, so why bother.
235 * ptossvp tosses all pages associated with this vnode
236 * All in-use pages are marked BAD
238 PTOSSVP(vp, (off_t)0, (off_t)MAXLONG);
241 /* Purge pages beyond end-of-file, when truncating a file.
243 * Locking: no lock is held, not even the global lock.
244 * activeV is raised. This is supposed to block pageins, but at present
245 * it only works on Solaris.
248 osi_VM_Truncate(avc, alen, acred)
251 struct AFS_UCRED *acred;
253 PTOSSVP(&avc->v, (off_t)alen, (off_t)MAXLONG);