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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: /*-
23: * Copyright 1997,1998 Julian Elischer. All rights reserved.
24: * [email protected]
25: *
26: * Redistribution and use in source and binary forms, with or without
27: * modification, are permitted provided that the following conditions are
28: * met:
29: * 1. Redistributions of source code must retain the above copyright
30: * notice, this list of conditions and the following disclaimer.
31: * 2. Redistributions in binary form must reproduce the above copyright notice,
32: * this list of conditions and the following disclaimer in the documentation
33: * and/or other materials provided with the distribution.
34: *
35: * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER ``AS IS'' AND ANY EXPRESS
36: * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
37: * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
38: * DISCLAIMED. IN NO EVENT SHALL THE HOLDER OR CONTRIBUTORS BE LIABLE FOR
39: * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
40: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
41: * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
42: * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
43: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
44: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
45: * SUCH DAMAGE.
46: *
47: * devfs_vfsops.c
48: *
49: */
50: /*
51: * HISTORY
52: * Dieter Siegmund ([email protected]) Wed Jul 14 13:37:59 PDT 1999
53: * - modified devfs_statfs() to use devfs_stats to calculate the
54: * amount of memory used by devfs
55: */
56:
57:
58: #include <sys/param.h>
59: #include <sys/systm.h>
60: #include <sys/kernel.h>
61: #include <sys/vnode.h>
62: #include <sys/proc.h>
63: #include <sys/mount.h>
64: #include <sys/malloc.h>
65:
66: #include "devfs.h"
67: #include "devfsdefs.h"
68:
69: static int devfs_statfs( struct mount *mp, struct statfs *sbp, struct proc *p);
70:
71: static struct vfsconf * devfs_vfsp = 0;
72: static int kernel_mount = 0;
73:
74:
75: /*-
76: * Called from the generic VFS startups.
77: * This is the second stage of DEVFS initialisation.
78: * The probed devices have already been loaded and the
79: * basic structure of the DEVFS created.
80: * We take the oportunity to mount the hidden DEVFS layer, so that
81: * devices from devfs get sync'd.
82: */
83: static int
84: devfs_init(struct vfsconf *vfsp)
85: {
86: devfs_vfsp = vfsp; /* remember this for devfs_kernel_mount below */
87:
88: if (devfs_sinit())
89: return (EOPNOTSUPP);
90: printf("devfs enabled\n");
91: devfs_make_node(makedev(0, 0), DEVFS_CHAR,
92: UID_ROOT, GID_WHEEL, 0622, "console");
93: devfs_make_node(makedev(2, 0), DEVFS_CHAR,
94: UID_ROOT, GID_WHEEL, 0666, "tty");
95: devfs_make_node(makedev(3, 0), DEVFS_CHAR,
96: UID_ROOT, GID_KMEM, 0640, "mem");
97: devfs_make_node(makedev(3, 1), DEVFS_CHAR,
98: UID_ROOT, GID_KMEM, 0640, "kmem");
99: devfs_make_node(makedev(3, 2), DEVFS_CHAR,
100: UID_ROOT, GID_WHEEL, 0666, "null");
101: devfs_make_node(makedev(6, 0), DEVFS_CHAR,
102: UID_ROOT, GID_WHEEL, 0600, "klog");
103: devfs_make_node(makedev(37, 0), DEVFS_CHAR,
104: UID_ROOT, GID_WHEEL, 0600, "nvram");
105: return 0;
106: }
107:
108: /*-
109: * mp - pointer to 'mount' structure
110: * path - addr in user space of mount point (ie /usr or whatever)
111: * data - addr in user space of mount params including the
112: * name of the block special file to treat as a filesystem.
113: * (NOT USED)
114: * ndp - namei data pointer (NOT USED)
115: * p - proc pointer
116: * devfs is special in that it doesn't require any device to be mounted..
117: * It makes up its data as it goes along.
118: * it must be mounted during single user.. until it is, only std{in/out/err}
119: * and the root filesystem are available.
120: */
121: /*proto*/
122: int
123: devfs_mount(struct mount *mp, char *path, caddr_t data,
124: struct nameidata *ndp, struct proc *p)
125: {
126: struct devfsmount *devfs_mp_p; /* devfs specific mount info */
127: int error;
128: size_t size;
129:
130: /*-
131: * If they just want to update, we don't need to do anything.
132: */
133: if (mp->mnt_flag & MNT_UPDATE)
134: {
135: return 0;
136: }
137:
138: /*-
139: * Well, it's not an update, it's a real mount request.
140: * Time to get dirty.
141: * HERE we should check to see if we are already mounted here.
142: */
143:
144: MALLOC(devfs_mp_p, struct devfsmount *, sizeof(struct devfsmount),
145: M_DEVFSMNT, M_WAITOK);
146: if (devfs_mp_p == NULL)
147: return (ENOMEM);
148: bzero(devfs_mp_p,sizeof(*devfs_mp_p));
149: devfs_mp_p->mount = mp;
150:
151: /*-
152: * Fill out some fields
153: */
154: mp->mnt_data = (qaddr_t)devfs_mp_p;
155: mp->mnt_stat.f_type = mp->mnt_vfc->vfc_typenum;
156: mp->mnt_stat.f_fsid.val[0] = (int32_t)(void *)devfs_mp_p;
157: mp->mnt_stat.f_fsid.val[1] = mp->mnt_stat.f_type;
158: mp->mnt_flag |= MNT_LOCAL;
159:
160: DEVFS_LOCK(p);
161: error = dev_dup_plane(devfs_mp_p);
162: DEVFS_UNLOCK(p);
163: if (error) {
164: mp->mnt_data = (qaddr_t)0;
165: FREE((caddr_t)devfs_mp_p, M_DEVFSMNT);
166: return (error);
167: }
168:
169: /*-
170: * Copy in the name of the directory the filesystem
171: * is to be mounted on.
172: * And we clear the remainder of the character strings
173: * to be tidy.
174: */
175:
176: if (!kernel_mount) {
177: copyinstr(path, (caddr_t)mp->mnt_stat.f_mntonname,
178: sizeof(mp->mnt_stat.f_mntonname)-1, &size);
179: bzero(mp->mnt_stat.f_mntonname + size,
180: sizeof(mp->mnt_stat.f_mntonname) - size);
181: }
182: bzero(mp->mnt_stat.f_mntfromname, MNAMELEN);
183: bcopy("devfs",mp->mnt_stat.f_mntfromname, 5);
184: DEVFS_INCR_MOUNTS();
185: (void)devfs_statfs(mp, &mp->mnt_stat, p);
186: return 0;
187: }
188:
189:
190: static int
191: devfs_start(struct mount *mp, int flags, struct proc *p)
192: {
193: return 0;
194: }
195:
196: /*-
197: * Unmount the filesystem described by mp.
198: */
199: static int
200: devfs_unmount( struct mount *mp, int mntflags, struct proc *p)
201: {
202: struct devfsmount *devfs_mp_p = (struct devfsmount *)mp->mnt_data;
203: int flags = 0;
204: int error;
205:
206: if (mntflags & MNT_FORCE) {
207: flags |= FORCECLOSE;
208: }
209: error = vflush(mp, NULLVP, flags);
210: if (error)
211: return error;
212:
213: DEVFS_LOCK(p);
214: devfs_free_plane(devfs_mp_p);
215: DEVFS_UNLOCK(p);
216: FREE((caddr_t)devfs_mp_p, M_DEVFSMNT);
217: DEVFS_DECR_MOUNTS();
218: mp->mnt_data = (qaddr_t)0;
219: mp->mnt_flag &= ~MNT_LOCAL;
220:
221: return 0;
222: }
223:
224: /* return the address of the root vnode in *vpp */
225: static int
226: devfs_root(struct mount *mp, struct vnode **vpp)
227: {
228: struct devfsmount *devfs_mp_p = (struct devfsmount *)(mp->mnt_data);
229: int error;
230:
231: error = devfs_dntovn(devfs_mp_p->plane_root->de_dnp,vpp,
232: current_proc());
233: return error;
234: }
235:
236: static int
237: devfs_quotactl(struct mount *mp, int cmds, uid_t uid, caddr_t arg,
238: struct proc *p)
239: {
240: return EOPNOTSUPP;
241: }
242:
243: static int
244: devfs_statfs( struct mount *mp, struct statfs *sbp, struct proc *p)
245: {
246: struct devfsmount *devfs_mp_p = (struct devfsmount *)mp->mnt_data;
247:
248: /*-
249: * Fill in the stat block.
250: */
251: sbp->f_type = mp->mnt_stat.f_type;
252: sbp->f_flags = 0; /* XXX */
253: sbp->f_bsize = 512;
254: sbp->f_iosize = 512;
255: sbp->f_blocks = (devfs_stats.mounts * sizeof(struct devfsmount)
256: + devfs_stats.nodes * sizeof(devnode_t)
257: + devfs_stats.entries * sizeof(devdirent_t)
258: + devfs_stats.stringspace
259: ) / sbp->f_bsize;
260: sbp->f_bfree = 0;
261: sbp->f_bavail = 0;
262: sbp->f_files = devfs_stats.nodes;
263: sbp->f_ffree = 0;
264: sbp->f_fsid.val[0] = (int32_t)(void *)devfs_mp_p;
265: sbp->f_fsid.val[1] = mp->mnt_stat.f_type;
266:
267: /*-
268: * Copy the mounted on and mounted from names into
269: * the passed in stat block, if it is not the one
270: * in the mount structure.
271: */
272: if (sbp != &mp->mnt_stat) {
273: bcopy((caddr_t)mp->mnt_stat.f_mntonname,
274: (caddr_t)&sbp->f_mntonname[0], MNAMELEN);
275: bcopy((caddr_t)mp->mnt_stat.f_mntfromname,
276: (caddr_t)&sbp->f_mntfromname[0], MNAMELEN);
277: }
278: return 0;
279: }
280:
281: static int
282: devfs_sync(struct mount *mp, int waitfor,struct ucred *cred,struct proc *p)
283: {
284: return (0);
285: }
286:
287:
288: static int
289: devfs_vget(struct mount *mp, void * ino,struct vnode **vpp)
290: {
291: return EOPNOTSUPP;
292: }
293:
294: /*************************************************************
295: * The concept of exporting a kernel generated devfs is stupid
296: * So don't handle filehandles
297: */
298:
299: static int
300: devfs_fhtovp (struct mount *mp, struct fid *fhp, struct mbuf *nam,
301: struct vnode **vpp, int *exflagsp, struct ucred **credanonp)
302: {
303: return (EINVAL);
304: }
305:
306:
307: static int
308: devfs_vptofh (struct vnode *vp, struct fid *fhp)
309: {
310: return (EINVAL);
311: }
312:
313: static int
314: devfs_sysctl(name, namelen, oldp, oldlenp, newp, newlen, p)
315: int *name;
316: u_int namelen;
317: void *oldp;
318: size_t *oldlenp;
319: void *newp;
320: size_t newlen;
321: struct proc *p;
322: {
323: return (EOPNOTSUPP);
324: }
325:
326: #include <sys/namei.h>
327:
328: /*
329: * Function: devfs_kernel_mount
330: * Purpose:
331: * Mount devfs at the given mount point from within the kernel.
332: */
333: int
334: devfs_kernel_mount(char * mntname)
335: {
336: struct mount *mp;
337: int error;
338: struct proc *procp;
339: struct nameidata nd;
340: struct vnode * vp;
341:
342: if (devfs_vfsp == NULL) {
343: printf("devfs_kernel_mount: devfs_vfsp is NULL\n");
344: return (EINVAL);
345: }
346: procp = current_proc();
347:
348: /*
349: * Get vnode to be covered
350: */
351: NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE,
352: mntname, procp);
353: if ((error = namei(&nd))) {
354: printf("devfs_kernel_mount: failed to find directory '%s', %d",
355: mntname, error);
356: return (error);
357: }
358: vp = nd.ni_vp;
359: if ((error = vinvalbuf(vp, V_SAVE, procp->p_ucred, procp, 0, 0))) {
360: printf("devfs_kernel_mount: vinval failed: %d\n", error);
361: vput(vp);
362: return (error);
363: }
364: if (vp->v_type != VDIR) {
365: printf("devfs_kernel_mount: '%s' is not a directory\n", mntname);
366: vput(vp);
367: return (ENOTDIR);
368: }
369: if (vp->v_mountedhere != NULL) {
370: vput(vp);
371: return (EBUSY);
372: }
373:
374: /*
375: * Allocate and initialize the filesystem.
376: */
377: mp = _MALLOC_ZONE((u_long)sizeof(struct mount), M_MOUNT, M_WAITOK);
378: lockinit(&mp->mnt_lock, PVFS, "vfslock", 0, 0);
379: (void)vfs_busy(mp, LK_NOWAIT, 0, procp);
380: LIST_INIT(&mp->mnt_vnodelist);
381: mp->mnt_op = devfs_vfsp->vfc_vfsops;
382: mp->mnt_vfc = devfs_vfsp;
383: devfs_vfsp->vfc_refcount++;
384: mp->mnt_flag = 0;
385: mp->mnt_flag |= devfs_vfsp->vfc_flags & MNT_VISFLAGMASK;
386: strncpy(mp->mnt_stat.f_fstypename, devfs_vfsp->vfc_name, MFSNAMELEN);
387: vp->v_mountedhere = mp;
388: mp->mnt_vnodecovered = vp;
389: mp->mnt_stat.f_owner = procp->p_ucred->cr_uid;
390: (void) copystr(mntname, mp->mnt_stat.f_mntonname, MNAMELEN - 1, 0);
391:
392: kernel_mount = 1;
393: error = devfs_mount(mp, mntname, NULL, NULL, procp);
394: kernel_mount = 0;
395: if (error) {
396: printf("devfs_kernel_mount: mount %s failed: %d", mntname, error);
397: mp->mnt_vfc->vfc_refcount--;
398: vfs_unbusy(mp, procp);
399: _FREE_ZONE(mp, sizeof (struct mount), M_MOUNT);
400: return (error);
401: }
402: printf("devfs on %s\n", mntname);
403: simple_lock(&mountlist_slock);
404: CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list);
405: simple_unlock(&mountlist_slock);
406: VOP_UNLOCK(vp, 0, procp);
407: vfs_unbusy(mp, procp);
408: return (0);
409: }
410:
411: struct vfsops devfs_vfsops = {
412: devfs_mount,
413: devfs_start,
414: devfs_unmount,
415: devfs_root,
416: devfs_quotactl,
417: devfs_statfs,
418: devfs_sync,
419: devfs_vget,
420: devfs_fhtovp,
421: devfs_vptofh,
422: devfs_init,
423: devfs_sysctl,
424: };
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