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1.1 root 1: /*
2: * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
3: *
4: * @APPLE_LICENSE_HEADER_START@
5: *
6: * The contents of this file constitute Original Code as defined in and
7: * are subject to the Apple Public Source License Version 1.1 (the
8: * "License"). You may not use this file except in compliance with the
9: * License. Please obtain a copy of the License at
10: * http://www.apple.com/publicsource and read it before using this file.
11: *
12: * This Original Code and all software distributed under the License are
13: * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
14: * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
15: * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
16: * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
17: * License for the specific language governing rights and limitations
18: * under the License.
19: *
20: * @APPLE_LICENSE_HEADER_END@
21: */
22: /* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */
23: /*
24: * Copyright (c) 1992, 1993
25: * The Regents of the University of California. All rights reserved.
26: *
27: * This code is derived from software donated to Berkeley by
28: * Jan-Simon Pendry.
29: *
30: * Redistribution and use in source and binary forms, with or without
31: * modification, are permitted provided that the following conditions
32: * are met:
33: * 1. Redistributions of source code must retain the above copyright
34: * notice, this list of conditions and the following disclaimer.
35: * 2. Redistributions in binary form must reproduce the above copyright
36: * notice, this list of conditions and the following disclaimer in the
37: * documentation and/or other materials provided with the distribution.
38: * 3. All advertising materials mentioning features or use of this software
39: * must display the following acknowledgement:
40: * This product includes software developed by the University of
41: * California, Berkeley and its contributors.
42: * 4. Neither the name of the University nor the names of its contributors
43: * may be used to endorse or promote products derived from this software
44: * without specific prior written permission.
45: *
46: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
47: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
48: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
49: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
50: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
51: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
52: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
53: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
54: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
55: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
56: * SUCH DAMAGE.
57: *
58: * @(#)null_vfsops.c 8.7 (Berkeley) 5/14/95
59: *
60: * @(#)lofs_vfsops.c 1.2 (Berkeley) 6/18/92
61: */
62:
63: /*
64: * Null Layer
65: * (See null_vnops.c for a description of what this does.)
66: */
67:
68: #include <sys/param.h>
69: #include <sys/systm.h>
70: #include <sys/proc.h>
71: #include <sys/time.h>
72: #include <sys/types.h>
73: #include <sys/vnode.h>
74: #include <sys/mount.h>
75: #include <sys/namei.h>
76: #include <sys/malloc.h>
77: #include <miscfs/nullfs/null.h>
78:
79: /*
80: * Mount null layer
81: */
82: int
83: nullfs_mount(mp, path, data, ndp, p)
84: struct mount *mp;
85: char *path;
86: caddr_t data;
87: struct nameidata *ndp;
88: struct proc *p;
89: {
90: int error = 0;
91: struct null_args args;
92: struct vnode *lowerrootvp, *vp;
93: struct vnode *nullm_rootvp;
94: struct null_mount *xmp;
95: u_int size;
96:
97: #ifdef NULLFS_DIAGNOSTIC
98: printf("nullfs_mount(mp = %x)\n", mp);
99: #endif
100:
101: /*
102: * Update is a no-op
103: */
104: if (mp->mnt_flag & MNT_UPDATE) {
105: return (EOPNOTSUPP);
106: /* return VFS_MOUNT(MOUNTTONULLMOUNT(mp)->nullm_vfs, path, data, ndp, p);*/
107: }
108:
109: /*
110: * Get argument
111: */
112: if (error = copyin(data, (caddr_t)&args, sizeof(struct null_args)))
113: return (error);
114:
115: /*
116: * Find lower node
117: */
118: NDINIT(ndp, LOOKUP, FOLLOW|WANTPARENT|LOCKLEAF,
119: UIO_USERSPACE, args.target, p);
120: if (error = namei(ndp))
121: return (error);
122:
123: /*
124: * Sanity check on lower vnode
125: */
126: lowerrootvp = ndp->ni_vp;
127:
128: vrele(ndp->ni_dvp);
129: ndp->ni_dvp = NULL;
130:
131: xmp = (struct null_mount *) _MALLOC(sizeof(struct null_mount),
132: M_UFSMNT, M_WAITOK); /* XXX */
133:
134: /*
135: * Save reference to underlying FS
136: */
137: xmp->nullm_vfs = lowerrootvp->v_mount;
138:
139: /*
140: * Save reference. Each mount also holds
141: * a reference on the root vnode.
142: */
143: error = null_node_create(mp, lowerrootvp, &vp);
144: /*
145: * Unlock the node (either the lower or the alias)
146: */
147: VOP_UNLOCK(vp, 0, p);
148: /*
149: * Make sure the node alias worked
150: */
151: if (error) {
152: vrele(lowerrootvp);
153: FREE(xmp, M_UFSMNT); /* XXX */
154: return (error);
155: }
156:
157: /*
158: * Keep a held reference to the root vnode.
159: * It is vrele'd in nullfs_unmount.
160: */
161: nullm_rootvp = vp;
162: nullm_rootvp->v_flag |= VROOT;
163: xmp->nullm_rootvp = nullm_rootvp;
164: if (NULLVPTOLOWERVP(nullm_rootvp)->v_mount->mnt_flag & MNT_LOCAL)
165: mp->mnt_flag |= MNT_LOCAL;
166: mp->mnt_data = (qaddr_t) xmp;
167: vfs_getnewfsid(mp);
168:
169: (void) copyinstr(path, mp->mnt_stat.f_mntonname, MNAMELEN - 1, &size);
170: bzero(mp->mnt_stat.f_mntonname + size, MNAMELEN - size);
171: (void) copyinstr(args.target, mp->mnt_stat.f_mntfromname, MNAMELEN - 1,
172: &size);
173: bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
174: #ifdef NULLFS_DIAGNOSTIC
175: printf("nullfs_mount: lower %s, alias at %s\n",
176: mp->mnt_stat.f_mntfromname, mp->mnt_stat.f_mntonname);
177: #endif
178: return (0);
179: }
180:
181: /*
182: * VFS start. Nothing needed here - the start routine
183: * on the underlying filesystem will have been called
184: * when that filesystem was mounted.
185: */
186: int
187: nullfs_start(mp, flags, p)
188: struct mount *mp;
189: int flags;
190: struct proc *p;
191: {
192: return (0);
193: /* return VFS_START(MOUNTTONULLMOUNT(mp)->nullm_vfs, flags, p); */
194: }
195:
196: /*
197: * Free reference to null layer
198: */
199: int
200: nullfs_unmount(mp, mntflags, p)
201: struct mount *mp;
202: int mntflags;
203: struct proc *p;
204: {
205: struct vnode *nullm_rootvp = MOUNTTONULLMOUNT(mp)->nullm_rootvp;
206: int error;
207: int flags = 0;
208:
209: #ifdef NULLFS_DIAGNOSTIC
210: printf("nullfs_unmount(mp = %x)\n", mp);
211: #endif
212:
213: if (mntflags & MNT_FORCE)
214: flags |= FORCECLOSE;
215:
216: /*
217: * Clear out buffer cache. I don't think we
218: * ever get anything cached at this level at the
219: * moment, but who knows...
220: */
221: #if 0
222: mntflushbuf(mp, 0);
223: if (mntinvalbuf(mp, 1))
224: return (EBUSY);
225: #endif
226: if (nullm_rootvp->v_usecount > 1)
227: return (EBUSY);
228: if (error = vflush(mp, nullm_rootvp, flags))
229: return (error);
230:
231: #ifdef NULLFS_DIAGNOSTIC
232: vprint("alias root of lower", nullm_rootvp);
233: #endif
234: /*
235: * Release reference on underlying root vnode
236: */
237: vrele(nullm_rootvp);
238: /*
239: * And blow it away for future re-use
240: */
241: vgone(nullm_rootvp);
242: /*
243: * Finally, throw away the null_mount structure
244: */
245: FREE(mp->mnt_data, M_UFSMNT); /* XXX */
246: mp->mnt_data = 0;
247: return 0;
248: }
249:
250: int
251: nullfs_root(mp, vpp)
252: struct mount *mp;
253: struct vnode **vpp;
254: {
255: struct proc *p = curproc; /* XXX */
256: struct vnode *vp;
257:
258: #ifdef NULLFS_DIAGNOSTIC
259: printf("nullfs_root(mp = %x, vp = %x->%x)\n", mp,
260: MOUNTTONULLMOUNT(mp)->nullm_rootvp,
261: NULLVPTOLOWERVP(MOUNTTONULLMOUNT(mp)->nullm_rootvp)
262: );
263: #endif
264:
265: /*
266: * Return locked reference to root.
267: */
268: vp = MOUNTTONULLMOUNT(mp)->nullm_rootvp;
269: VREF(vp);
270: vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p);
271: *vpp = vp;
272: return 0;
273: }
274:
275: int
276: nullfs_quotactl(mp, cmd, uid, arg, p)
277: struct mount *mp;
278: int cmd;
279: uid_t uid;
280: caddr_t arg;
281: struct proc *p;
282: {
283: return VFS_QUOTACTL(MOUNTTONULLMOUNT(mp)->nullm_vfs, cmd, uid, arg, p);
284: }
285:
286: int
287: nullfs_statfs(mp, sbp, p)
288: struct mount *mp;
289: struct statfs *sbp;
290: struct proc *p;
291: {
292: int error;
293: struct statfs mstat;
294:
295: #ifdef NULLFS_DIAGNOSTIC
296: printf("nullfs_statfs(mp = %x, vp = %x->%x)\n", mp,
297: MOUNTTONULLMOUNT(mp)->nullm_rootvp,
298: NULLVPTOLOWERVP(MOUNTTONULLMOUNT(mp)->nullm_rootvp)
299: );
300: #endif
301:
302: bzero(&mstat, sizeof(mstat));
303:
304: error = VFS_STATFS(MOUNTTONULLMOUNT(mp)->nullm_vfs, &mstat, p);
305: if (error)
306: return (error);
307:
308: /* now copy across the "interesting" information and fake the rest */
309: sbp->f_type = mstat.f_type;
310: sbp->f_flags = mstat.f_flags;
311: sbp->f_bsize = mstat.f_bsize;
312: sbp->f_iosize = mstat.f_iosize;
313: sbp->f_blocks = mstat.f_blocks;
314: sbp->f_bfree = mstat.f_bfree;
315: sbp->f_bavail = mstat.f_bavail;
316: sbp->f_files = mstat.f_files;
317: sbp->f_ffree = mstat.f_ffree;
318: if (sbp != &mp->mnt_stat) {
319: bcopy(&mp->mnt_stat.f_fsid, &sbp->f_fsid, sizeof(sbp->f_fsid));
320: bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN);
321: bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN);
322: }
323: return (0);
324: }
325:
326: int
327: nullfs_sync(mp, waitfor, cred, p)
328: struct mount *mp;
329: int waitfor;
330: struct ucred *cred;
331: struct proc *p;
332: {
333: /*
334: * XXX - Assumes no data cached at null layer.
335: */
336: return (0);
337: }
338:
339: int
340: nullfs_vget(mp, ino, vpp)
341: struct mount *mp;
342: ino_t ino;
343: struct vnode **vpp;
344: {
345:
346: return VFS_VGET(MOUNTTONULLMOUNT(mp)->nullm_vfs, ino, vpp);
347: }
348:
349: int
350: nullfs_fhtovp(mp, fidp, nam, vpp, exflagsp, credanonp)
351: struct mount *mp;
352: struct fid *fidp;
353: struct mbuf *nam;
354: struct vnode **vpp;
355: int *exflagsp;
356: struct ucred**credanonp;
357: {
358:
359: return VFS_FHTOVP(MOUNTTONULLMOUNT(mp)->nullm_vfs, fidp, nam, vpp, exflagsp,credanonp);
360: }
361:
362: int
363: nullfs_vptofh(vp, fhp)
364: struct vnode *vp;
365: struct fid *fhp;
366: {
367: return VFS_VPTOFH(NULLVPTOLOWERVP(vp), fhp);
368: }
369:
370: int nullfs_init __P((struct vfsconf *));
371:
372: #define nullfs_sysctl ((int (*) __P((int *, u_int, void *, size_t *, void *, \
373: size_t, struct proc *)))eopnotsupp)
374:
375: struct vfsops null_vfsops = {
376: nullfs_mount,
377: nullfs_start,
378: nullfs_unmount,
379: nullfs_root,
380: nullfs_quotactl,
381: nullfs_statfs,
382: nullfs_sync,
383: nullfs_vget,
384: nullfs_fhtovp,
385: nullfs_vptofh,
386: nullfs_init,
387: nullfs_sysctl,
388: };
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