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1.1 root 1: /*
2: * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
3: *
4: * @APPLE_LICENSE_HEADER_START@
5: *
6: * Portions Copyright (c) 1999 Apple Computer, Inc. All Rights
7: * Reserved. This file contains Original Code and/or Modifications of
8: * Original Code as defined in and that are subject to the Apple Public
9: * Source License Version 1.1 (the "License"). You may not use this file
10: * except in compliance with the License. Please obtain a copy of the
11: * License at http://www.apple.com/publicsource and read it before using
12: * this file.
13: *
14: * The Original Code and all software distributed under the License are
15: * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
16: * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
17: * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
18: * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
19: * License for the specific language governing rights and limitations
20: * under the License.
21: *
22: * @APPLE_LICENSE_HEADER_END@
23: */
24:
25: /* $NetBSD: umap_vfsops.c,v 1.7 1995/03/09 12:05:59 mycroft Exp $ */
26:
27: /*
28: * Copyright (c) 1992, 1993
29: * The Regents of the University of California. All rights reserved.
30: *
31: * This code is derived from software donated to Berkeley by
32: * the UCLA Ficus project.
33: *
34: * Redistribution and use in source and binary forms, with or without
35: * modification, are permitted provided that the following conditions
36: * are met:
37: * 1. Redistributions of source code must retain the above copyright
38: * notice, this list of conditions and the following disclaimer.
39: * 2. Redistributions in binary form must reproduce the above copyright
40: * notice, this list of conditions and the following disclaimer in the
41: * documentation and/or other materials provided with the distribution.
42: * 3. All advertising materials mentioning features or use of this software
43: * must display the following acknowledgement:
44: * This product includes software developed by the University of
45: * California, Berkeley and its contributors.
46: * 4. Neither the name of the University nor the names of its contributors
47: * may be used to endorse or promote products derived from this software
48: * without specific prior written permission.
49: *
50: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
51: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
52: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
53: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
54: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
55: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
56: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
57: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
58: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
59: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
60: * SUCH DAMAGE.
61: *
62: * from: @(#)null_vfsops.c 1.5 (Berkeley) 7/10/92
63: * @(#)umap_vfsops.c 8.3 (Berkeley) 1/21/94
64: */
65:
66: /*
67: * Umap Layer
68: * (See mount_umap(8) for a description of this layer.)
69: */
70:
71: #include <sys/param.h>
72: #include <sys/systm.h>
73: #include <sys/time.h>
74: #include <sys/types.h>
75: #include <sys/vnode.h>
76: #include <sys/mount.h>
77: #include <sys/namei.h>
78: #include <sys/malloc.h>
79: #include <miscfs/umapfs/umap.h>
80:
81: /*
82: * Mount umap layer
83: */
84: int
85: umapfs_mount(mp, path, data, ndp, p)
86: struct mount *mp;
87: char *path;
88: caddr_t data;
89: struct nameidata *ndp;
90: struct proc *p;
91: {
92: struct umap_args args;
93: struct vnode *lowerrootvp, *vp;
94: struct vnode *umapm_rootvp;
95: struct umap_mount *amp;
96: size_t size;
97: int error;
98:
99: #ifdef UMAPFS_DIAGNOSTIC
100: printf("umapfs_mount(mp = %x)\n", mp);
101: #endif
102:
103: /*
104: * Update is a no-op
105: */
106: if (mp->mnt_flag & MNT_UPDATE) {
107: return (EOPNOTSUPP);
108: /* return (VFS_MOUNT(MOUNTTOUMAPMOUNT(mp)->umapm_vfs, path, data, ndp, p));*/
109: }
110:
111: /*
112: * Get argument
113: */
114: if (error = copyin(data, (caddr_t)&args, sizeof(struct umap_args)))
115: return (error);
116:
117: /*
118: * Find lower node
119: */
120: NDINIT(ndp, LOOKUP, FOLLOW|WANTPARENT|LOCKLEAF,
121: UIO_USERSPACE, args.target, p);
122: if (error = namei(ndp))
123: return (error);
124:
125: /*
126: * Sanity check on lower vnode
127: */
128: lowerrootvp = ndp->ni_vp;
129: #ifdef UMAPFS_DIAGNOSTIC
130: printf("vp = %x, check for VDIR...\n", lowerrootvp);
131: #endif
132: vrele(ndp->ni_dvp);
133: ndp->ni_dvp = 0;
134:
135: if (lowerrootvp->v_type != VDIR) {
136: vput(lowerrootvp);
137: return (EINVAL);
138: }
139:
140: #ifdef UMAPFS_DIAGNOSTIC
141: printf("mp = %x\n", mp);
142: #endif
143:
144: // amp = (struct umap_mount *) malloc(sizeof(struct umap_mount),
145: // M_UFSMNT, M_WAITOK); /* XXX */
146: MALLOC(amp, struct umap_mount *, sizeof(struct umap_mount),
147: M_UFSMNT, M_WAITOK);
148:
149: /*
150: * Save reference to underlying FS
151: */
152: amp->umapm_vfs = lowerrootvp->v_mount;
153:
154: /*
155: * Now copy in the number of entries and maps for umap mapping.
156: */
157: amp->info_nentries = args.nentries;
158: amp->info_gnentries = args.gnentries;
159: error = copyin(args.mapdata, (caddr_t)amp->info_mapdata,
160: 2*sizeof(u_long)*args.nentries);
161: if (error)
162: return (error);
163:
164: #ifdef UMAP_DIAGNOSTIC
165: printf("umap_mount:nentries %d\n",args.nentries);
166: for (i = 0; i < args.nentries; i++)
167: printf(" %d maps to %d\n", amp->info_mapdata[i][0],
168: amp->info_mapdata[i][1]);
169: #endif
170:
171: error = copyin(args.gmapdata, (caddr_t)amp->info_gmapdata,
172: 2*sizeof(u_long)*args.nentries);
173: if (error)
174: return (error);
175:
176: #ifdef UMAP_DIAGNOSTIC
177: printf("umap_mount:gnentries %d\n",args.gnentries);
178: for (i = 0; i < args.gnentries; i++)
179: printf(" group %d maps to %d\n",
180: amp->info_gmapdata[i][0],
181: amp->info_gmapdata[i][1]);
182: #endif
183:
184:
185: /*
186: * Save reference. Each mount also holds
187: * a reference on the root vnode.
188: */
189: error = umap_node_create(mp, lowerrootvp, &vp);
190: /*
191: * Unlock the node (either the lower or the alias)
192: */
193: VOP_UNLOCK(vp);
194: /*
195: * Make sure the node alias worked
196: */
197: if (error) {
198: vrele(lowerrootvp);
199: free(amp, M_UFSMNT); /* XXX */
200: return (error);
201: }
202:
203: /*
204: * Keep a held reference to the root vnode.
205: * It is vrele'd in umapfs_unmount.
206: */
207: umapm_rootvp = vp;
208: umapm_rootvp->v_flag |= VROOT;
209: amp->umapm_rootvp = umapm_rootvp;
210: if (UMAPVPTOLOWERVP(umapm_rootvp)->v_mount->mnt_flag & MNT_LOCAL)
211: mp->mnt_flag |= MNT_LOCAL;
212: mp->mnt_data = (qaddr_t) amp;
213: getnewfsid(mp, makefstype(MOUNT_LOFS));
214:
215: (void) copyinstr(path, mp->mnt_stat.f_mntonname, MNAMELEN - 1, &size);
216: bzero(mp->mnt_stat.f_mntonname + size, MNAMELEN - size);
217: (void) copyinstr(args.target, mp->mnt_stat.f_mntfromname, MNAMELEN - 1,
218: &size);
219: bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
220: #ifdef UMAPFS_DIAGNOSTIC
221: printf("umapfs_mount: lower %s, alias at %s\n",
222: mp->mnt_stat.f_mntfromname, mp->mnt_stat.f_mntonname);
223: #endif
224: return (0);
225: }
226:
227: /*
228: * VFS start. Nothing needed here - the start routine
229: * on the underlying filesystem will have been called
230: * when that filesystem was mounted.
231: */
232: int
233: umapfs_start(mp, flags, p)
234: struct mount *mp;
235: int flags;
236: struct proc *p;
237: {
238:
239: return (0);
240: /* return (VFS_START(MOUNTTOUMAPMOUNT(mp)->umapm_vfs, flags, p)); */
241: }
242:
243: /*
244: * Free reference to umap layer
245: */
246: int
247: umapfs_unmount(mp, mntflags, p)
248: struct mount *mp;
249: int mntflags;
250: struct proc *p;
251: {
252: struct vnode *umapm_rootvp = MOUNTTOUMAPMOUNT(mp)->umapm_rootvp;
253: int error;
254: int flags = 0;
255: extern int doforce;
256:
257: #ifdef UMAPFS_DIAGNOSTIC
258: printf("umapfs_unmount(mp = %x)\n", mp);
259: #endif
260:
261: if (mntflags & MNT_FORCE) {
262: /* lofs can never be rootfs so don't check for it */
263: if (!doforce)
264: return (EINVAL);
265: flags |= FORCECLOSE;
266: }
267:
268: /*
269: * Clear out buffer cache. I don't think we
270: * ever get anything cached at this level at the
271: * moment, but who knows...
272: */
273: #ifdef notyet
274: mntflushbuf(mp, 0);
275: if (mntinvalbuf(mp, 1))
276: return (EBUSY);
277: #endif
278: if (umapm_rootvp->v_usecount > 1)
279: return (EBUSY);
280: if (error = vflush(mp, umapm_rootvp, flags))
281: return (error);
282:
283: #ifdef UMAPFS_DIAGNOSTIC
284: vprint("alias root of lower", umapm_rootvp);
285: #endif
286: /*
287: * Release reference on underlying root vnode
288: */
289: vrele(umapm_rootvp);
290: /*
291: * And blow it away for future re-use
292: */
293: vgone(umapm_rootvp);
294: /*
295: * Finally, throw away the umap_mount structure
296: */
297: free(mp->mnt_data, M_UFSMNT); /* XXX */
298: mp->mnt_data = 0;
299: return (0);
300: }
301:
302: int
303: umapfs_root(mp, vpp)
304: struct mount *mp;
305: struct vnode **vpp;
306: {
307: struct vnode *vp;
308:
309: #ifdef UMAPFS_DIAGNOSTIC
310: printf("umapfs_root(mp = %x, vp = %x->%x)\n", mp,
311: MOUNTTOUMAPMOUNT(mp)->umapm_rootvp,
312: UMAPVPTOLOWERVP(MOUNTTOUMAPMOUNT(mp)->umapm_rootvp)
313: );
314: #endif
315:
316: /*
317: * Return locked reference to root.
318: */
319: vp = MOUNTTOUMAPMOUNT(mp)->umapm_rootvp;
320: VREF(vp);
321: VOP_LOCK(vp);
322: *vpp = vp;
323: return (0);
324: }
325:
326: int
327: umapfs_quotactl(mp, cmd, uid, arg, p)
328: struct mount *mp;
329: int cmd;
330: uid_t uid;
331: caddr_t arg;
332: struct proc *p;
333: {
334:
335: return (VFS_QUOTACTL(MOUNTTOUMAPMOUNT(mp)->umapm_vfs, cmd, uid, arg, p));
336: }
337:
338: int
339: umapfs_statfs(mp, sbp, p)
340: struct mount *mp;
341: struct statfs *sbp;
342: struct proc *p;
343: {
344: int error;
345: struct statfs mstat;
346:
347: #ifdef UMAPFS_DIAGNOSTIC
348: printf("umapfs_statfs(mp = %x, vp = %x->%x)\n", mp,
349: MOUNTTOUMAPMOUNT(mp)->umapm_rootvp,
350: UMAPVPTOLOWERVP(MOUNTTOUMAPMOUNT(mp)->umapm_rootvp)
351: );
352: #endif
353:
354: bzero(&mstat, sizeof(mstat));
355:
356: error = VFS_STATFS(MOUNTTOUMAPMOUNT(mp)->umapm_vfs, &mstat, p);
357: if (error)
358: return (error);
359:
360: /* now copy across the "interesting" information and fake the rest */
361: sbp->f_type = mstat.f_type;
362: sbp->f_flags = mstat.f_flags;
363: sbp->f_bsize = mstat.f_bsize;
364: sbp->f_iosize = mstat.f_iosize;
365: sbp->f_blocks = mstat.f_blocks;
366: sbp->f_bfree = mstat.f_bfree;
367: sbp->f_bavail = mstat.f_bavail;
368: sbp->f_files = mstat.f_files;
369: sbp->f_ffree = mstat.f_ffree;
370: if (sbp != &mp->mnt_stat) {
371: bcopy(&mp->mnt_stat.f_fsid, &sbp->f_fsid, sizeof(sbp->f_fsid));
372: bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN);
373: bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN);
374: }
375: strncpy(sbp->f_fstypename, mp->mnt_op->vfs_name, MFSNAMELEN);
376: sbp->f_fstypename[MFSNAMELEN] = '\0';
377: return (0);
378: }
379:
380: int
381: umapfs_sync(mp, waitfor, cred, p)
382: struct mount *mp;
383: int waitfor;
384: struct ucred *cred;
385: struct proc *p;
386: {
387:
388: /*
389: * XXX - Assumes no data cached at umap layer.
390: */
391: return (0);
392: }
393:
394: int
395: umapfs_vget(mp, ino, vpp)
396: struct mount *mp;
397: ino_t ino;
398: struct vnode **vpp;
399: {
400:
401: return (VFS_VGET(MOUNTTOUMAPMOUNT(mp)->umapm_vfs, ino, vpp));
402: }
403:
404: int
405: umapfs_fhtovp(mp, fidp, nam, vpp, exflagsp, credanonp)
406: struct mount *mp;
407: struct fid *fidp;
408: struct mbuf *nam;
409: struct vnode **vpp;
410: int *exflagsp;
411: struct ucred**credanonp;
412: {
413:
414: return (EOPNOTSUPP);
415: }
416:
417: int
418: umapfs_vptofh(vp, fhp)
419: struct vnode *vp;
420: struct fid *fhp;
421: {
422:
423: return (EOPNOTSUPP);
424: }
425:
426: int umapfs_init __P((void));
427:
428: struct vfsops umap_vfsops = {
429: MOUNT_UMAP,
430: umapfs_mount,
431: umapfs_start,
432: umapfs_unmount,
433: umapfs_root,
434: umapfs_quotactl,
435: umapfs_statfs,
436: umapfs_sync,
437: umapfs_vget,
438: umapfs_fhtovp,
439: umapfs_vptofh,
440: umapfs_init,
441: };
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