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 <afsconfig.h>
15 #include "../afs/sysincludes.h" /* Standard vendor system headers */
16 #include "../afs/afsincludes.h" /* Afs-based standard headers */
17 #include "../afs/afs_stats.h" /* statistics */
18 #include "sys/flock.h" /* for IGN_PID */
20 extern struct vnodeops Afs_vnodeops;
22 /* Try to discard pages, in order to recycle a vcache entry.
24 * We also make some sanity checks: ref count, open count, held locks.
26 * We also do some non-VM-related chores, such as releasing the cred pointer
27 * (for AIX and Solaris) and releasing the gnode (for AIX).
29 * Locking: afs_xvcache lock is held. If it is dropped and re-acquired,
30 * *slept should be set to warn the caller.
32 * Formerly, afs_xvcache was dropped and re-acquired for Solaris, but now it
33 * is not dropped and re-acquired for any platform. It may be that *slept is
34 * therefore obsolescent.
37 osi_VM_FlushVCache(avc, slept)
42 vnode_t *vp = &avc->v;
44 if (avc->vrefCount != 0)
51 * Just in case someone is still referring to the vnode we give up
52 * trying to get rid of this guy.
54 if (CheckLock(&avc->lock) || LockWaiters(&avc->lock))
60 * we just need to avoid the race
61 * in vn_rele between the ref count going to 0 and VOP_INACTIVE
63 * Note that although we checked vcount above, we didn't have the lock
65 if (vp->v_count > 0 || (vp->v_flag & VINACT)) {
72 * Since we store on last close and on VOP_INACTIVE
73 * there should be NO dirty pages
74 * Note that we hold the xvcache lock the entire time.
77 PTOSSVP(vp, (off_t)0, (off_t)MAXLONG);
80 /* afs_chkpgoob will drop and re-acquire the global lock. */
82 osi_Assert(!VN_GET_PGCNT(vp));
83 osi_Assert(!AFS_VN_MAPPED(vp));
84 osi_Assert(!AFS_VN_DIRTY(&avc->v));
86 #if defined(AFS_SGI65_ENV)
88 cleanlocks(vp, IGN_PID, 0);
89 mutex_destroy(&vp->v_filocksem);
90 #else /* AFS_SGI65_ENV */
91 if (vp->v_filocksem) {
94 cleanlocks(vp, &curprocp->p_flid);
96 cleanlocks(vp, IGN_PID, 0);
98 osi_Assert(vp->v_filocks == NULL);
99 mutex_destroy(vp->v_filocksem);
100 kmem_free(vp->v_filocksem, sizeof *vp->v_filocksem);
101 vp->v_filocksem = NULL;
103 #endif /* AFS_SGI65_ENV */
105 if (avc->vrefCount) osi_Panic("flushVcache: vm race");
108 vnode_pcache_reclaim(vp); /* this can sleep */
109 vnode_pcache_free(vp);
110 if (vp->v_op != &Afs_vnodeops) {
111 VOP_RECLAIM(vp, FSYNC_WAIT, code);
116 ktrace_free(vp->v_trace);
117 #endif /* VNODE_TRACING */
118 vn_bhv_remove(VN_BHV_HEAD(vp), &(avc->vc_bhv_desc));
119 vn_bhv_head_destroy(&(vp->v_bh));
120 destroy_bitlock(&vp->v_pcacheflag);
121 mutex_destroy(&vp->v_buf_lock);
123 bhv_remove(VN_BHV_HEAD(vp), &(avc->vc_bhv_desc));
124 bhv_head_destroy(&(vp->v_bh));
126 vp->v_flag = 0; /* debug */
127 #if defined(DEBUG) && defined(VNODE_INIT_BITLOCK)
128 destroy_bitlock(&vp->v_flag);
131 AFS_VN_DESTROY_BUF_LOCK(vp);
133 #endif /* AFS_SGI64_ENV */
138 /* Try to invalidate pages, for "fs flush" or "fs flushv"; or
139 * try to free pages, when deleting a file.
141 * Locking: the vcache entry's lock is held. It may be dropped and
144 * Since we drop and re-obtain the lock, we can't guarantee that there won't
145 * be some pages around when we return, newly created by concurrent activity.
148 osi_VM_TryToSmush(avc, acred, sync)
150 struct AFS_UCRED *acred;
153 ReleaseWriteLock(&avc->lock);
155 /* current remapf restriction - cannot have VOP_RWLOCK */
156 osi_Assert(OSI_GET_LOCKID() != avc->vc_rwlockid);
157 if (((vnode_t *)avc)->v_type == VREG && AFS_VN_MAPPED(((vnode_t *)avc)))
158 remapf(((vnode_t *)avc), 0, 0);
159 PTOSSVP((struct vnode *)avc, (off_t)0, (off_t)MAXLONG);
161 ObtainWriteLock(&avc->lock,62);
164 /* Flush and invalidate pages, for fsync() with INVAL flag
166 * Locking: only the global lock is held.
169 osi_VM_FSyncInval(avc)
173 PFLUSHINVALVP((vnode_t *)avc, (off_t)0, (off_t)avc->m.Length);
177 /* Try to store pages to cache, in order to store a file back to the server.
179 * Locking: the vcache entry's lock is held. It will usually be dropped and
183 osi_VM_StoreAllSegments(avc)
187 osi_Assert(valusema(&avc->vc_rwlock) <= 0);
188 osi_Assert(OSI_GET_LOCKID() == avc->vc_rwlockid);
189 osi_Assert(avc->vrefCount > 0);
190 ReleaseWriteLock(&avc->lock);
191 /* We may call back into AFS via:
192 * pflushvp->chunkpush->do_pdflush->mp_afs_bmap
196 /* Write out dirty pages list to avoid B_DELWRI buffers. */
197 while (VN_GET_DPAGES((vnode_t*)avc)) {
198 pdflush((struct vnode*)avc, 0);
201 PFLUSHVP((struct vnode *)avc, (off_t)avc->m.Length, (off_t)0, error);
205 * If this fails (due to quota overage, etc.)
206 * what can we do?? we need to sure that
207 * that the VM cache is cleared of dirty pages
208 * We note that pinvalfree ignores write errors & otherwise
209 * does what we want (we don't use this normally since
210 * it also unhashes pages ..)
212 PINVALFREE((vnode_t *)avc, avc->m.Length);
214 ObtainWriteLock(&avc->lock,121);
215 if (error && avc->m.LinkCount)
216 cmn_err(CE_WARN, "AFS:Failed to push back pages for vnode 0x%x error %d (from afs_StoreOnLastReference)",
220 /* Purge VM for a file when its callback is revoked.
222 * Locking: No lock is held, not even the global lock.
225 osi_VM_FlushPages(avc, credp)
227 struct AFS_UCRED *credp;
229 vnode_t *vp = (vnode_t *)avc;
231 remapf(vp, /*avc->m.Length*/ 0, 0);
233 /* Used to grab locks and recheck avc->m.DataVersion and
234 * avc->execsOrWriters here, but we have to drop locks before calling
235 * ptossvp() anyway, so why bother.
239 * ptossvp tosses all pages associated with this vnode
240 * All in-use pages are marked BAD
242 PTOSSVP(vp, (off_t)0, (off_t)MAXLONG);
245 /* Purge pages beyond end-of-file, when truncating a file.
247 * Locking: no lock is held, not even the global lock.
248 * activeV is raised. This is supposed to block pageins, but at present
249 * it only works on Solaris.
252 osi_VM_Truncate(avc, alen, acred)
255 struct AFS_UCRED *acred;
257 PTOSSVP(&avc->v, (off_t)alen, (off_t)MAXLONG);