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341568e0 | 1 | /* |
99315dca KB |
2 | * Copyright (c) 1992, 1993 |
3 | * The Regents of the University of California. All rights reserved. | |
341568e0 JSP |
4 | * |
5 | * This code is derived from software donated to Berkeley by | |
6 | * Jan-Simon Pendry. | |
7 | * | |
8 | * %sccs.include.redist.c% | |
9 | * | |
1611db1e | 10 | * @(#)kernfs_vfsops.c 8.4 (Berkeley) %G% |
341568e0 JSP |
11 | */ |
12 | ||
13 | /* | |
14 | * Kernel params Filesystem | |
15 | */ | |
16 | ||
17 | #include <sys/param.h> | |
18 | #include <sys/systm.h> | |
a1e23f7a | 19 | #include <sys/conf.h> |
341568e0 JSP |
20 | #include <sys/types.h> |
21 | #include <sys/proc.h> | |
22 | #include <sys/vnode.h> | |
23 | #include <sys/mount.h> | |
24 | #include <sys/namei.h> | |
25 | #include <sys/malloc.h> | |
a1e23f7a JSP |
26 | |
27 | #include <miscfs/specfs/specdev.h> | |
341568e0 JSP |
28 | #include <miscfs/kernfs/kernfs.h> |
29 | ||
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30 | struct vnode *rrootvp; |
31 | ||
32 | /* | |
33 | * Create a vnode for a character device. | |
34 | */ | |
35 | int | |
36 | cdevvp(dev, vpp) | |
37 | dev_t dev; | |
38 | struct vnode **vpp; | |
39 | { | |
40 | register struct vnode *vp; | |
41 | struct vnode *nvp; | |
42 | int error; | |
43 | ||
44 | if (dev == NODEV) | |
45 | return (0); | |
46 | error = getnewvnode(VT_NON, (struct mount *)0, spec_vnodeop_p, &nvp); | |
47 | if (error) { | |
48 | *vpp = 0; | |
49 | return (error); | |
50 | } | |
51 | vp = nvp; | |
52 | vp->v_type = VCHR; | |
53 | if (nvp = checkalias(vp, dev, (struct mount *)0)) { | |
54 | vput(vp); | |
55 | vp = nvp; | |
56 | } | |
57 | *vpp = vp; | |
58 | return (0); | |
59 | } | |
60 | ||
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61 | kernfs_init() |
62 | { | |
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63 | int cmaj; |
64 | int bmaj = major(rootdev); | |
fdcf3f78 | 65 | int error = ENXIO; |
a1e23f7a | 66 | |
341568e0 JSP |
67 | #ifdef KERNFS_DIAGNOSTIC |
68 | printf("kernfs_init\n"); /* printed during system boot */ | |
69 | #endif | |
a1e23f7a JSP |
70 | |
71 | for (cmaj = 0; cmaj < nchrdev; cmaj++) { | |
72 | if (cdevsw[cmaj].d_open == bdevsw[bmaj].d_open) { | |
73 | dev_t cdev = makedev(cmaj, minor(rootdev)); | |
74 | error = cdevvp(cdev, &rrootvp); | |
75 | if (error == 0) | |
76 | break; | |
77 | } | |
78 | } | |
79 | ||
80 | if (error) { | |
81 | printf("kernfs: no raw boot device\n"); | |
82 | rrootvp = 0; | |
83 | } | |
341568e0 JSP |
84 | } |
85 | ||
86 | /* | |
87 | * Mount the Kernel params filesystem | |
88 | */ | |
89 | kernfs_mount(mp, path, data, ndp, p) | |
90 | struct mount *mp; | |
91 | char *path; | |
92 | caddr_t data; | |
93 | struct nameidata *ndp; | |
94 | struct proc *p; | |
95 | { | |
96 | int error = 0; | |
97 | u_int size; | |
98 | struct kernfs_mount *fmp; | |
99 | struct vnode *rvp; | |
100 | ||
101 | #ifdef KERNFS_DIAGNOSTIC | |
102 | printf("kernfs_mount(mp = %x)\n", mp); | |
103 | #endif | |
104 | ||
105 | /* | |
106 | * Update is a no-op | |
107 | */ | |
108 | if (mp->mnt_flag & MNT_UPDATE) | |
109 | return (EOPNOTSUPP); | |
110 | ||
46a14367 | 111 | error = getnewvnode(VT_KERNFS, mp, kernfs_vnodeop_p, &rvp); /* XXX */ |
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112 | if (error) |
113 | return (error); | |
114 | ||
115 | MALLOC(fmp, struct kernfs_mount *, sizeof(struct kernfs_mount), | |
116 | M_UFSMNT, M_WAITOK); /* XXX */ | |
117 | rvp->v_type = VDIR; | |
118 | rvp->v_flag |= VROOT; | |
119 | #ifdef KERNFS_DIAGNOSTIC | |
120 | printf("kernfs_mount: root vp = %x\n", rvp); | |
121 | #endif | |
122 | fmp->kf_root = rvp; | |
123 | mp->mnt_flag |= MNT_LOCAL; | |
124 | mp->mnt_data = (qaddr_t) fmp; | |
125 | getnewfsid(mp, MOUNT_KERNFS); | |
126 | ||
127 | (void) copyinstr(path, mp->mnt_stat.f_mntonname, MNAMELEN - 1, &size); | |
128 | bzero(mp->mnt_stat.f_mntonname + size, MNAMELEN - size); | |
129 | bzero(mp->mnt_stat.f_mntfromname, MNAMELEN); | |
130 | bcopy("kernfs", mp->mnt_stat.f_mntfromname, sizeof("kernfs")); | |
131 | #ifdef KERNFS_DIAGNOSTIC | |
132 | printf("kernfs_mount: at %s\n", mp->mnt_stat.f_mntonname); | |
133 | #endif | |
134 | return (0); | |
135 | } | |
136 | ||
137 | kernfs_start(mp, flags, p) | |
138 | struct mount *mp; | |
139 | int flags; | |
140 | struct proc *p; | |
141 | { | |
142 | return (0); | |
143 | } | |
144 | ||
145 | kernfs_unmount(mp, mntflags, p) | |
146 | struct mount *mp; | |
147 | int mntflags; | |
148 | struct proc *p; | |
149 | { | |
150 | int error; | |
151 | int flags = 0; | |
152 | extern int doforce; | |
153 | struct vnode *rootvp = VFSTOKERNFS(mp)->kf_root; | |
154 | ||
155 | #ifdef KERNFS_DIAGNOSTIC | |
156 | printf("kernfs_unmount(mp = %x)\n", mp); | |
157 | #endif | |
158 | ||
159 | if (mntflags & MNT_FORCE) { | |
160 | /* kernfs can never be rootfs so don't check for it */ | |
161 | if (!doforce) | |
162 | return (EINVAL); | |
163 | flags |= FORCECLOSE; | |
164 | } | |
165 | ||
166 | /* | |
167 | * Clear out buffer cache. I don't think we | |
168 | * ever get anything cached at this level at the | |
169 | * moment, but who knows... | |
170 | */ | |
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171 | if (rootvp->v_usecount > 1) |
172 | return (EBUSY); | |
173 | #ifdef KERNFS_DIAGNOSTIC | |
174 | printf("kernfs_unmount: calling vflush\n"); | |
175 | #endif | |
176 | if (error = vflush(mp, rootvp, flags)) | |
177 | return (error); | |
178 | ||
179 | #ifdef KERNFS_DIAGNOSTIC | |
180 | vprint("kernfs root", rootvp); | |
fdf8b1b4 | 181 | #endif |
341568e0 JSP |
182 | /* |
183 | * Release reference on underlying root vnode | |
184 | */ | |
185 | vrele(rootvp); | |
186 | /* | |
187 | * And blow it away for future re-use | |
188 | */ | |
189 | vgone(rootvp); | |
190 | /* | |
191 | * Finally, throw away the kernfs_mount structure | |
192 | */ | |
193 | free(mp->mnt_data, M_UFSMNT); /* XXX */ | |
194 | mp->mnt_data = 0; | |
195 | return 0; | |
196 | } | |
197 | ||
198 | kernfs_root(mp, vpp) | |
199 | struct mount *mp; | |
200 | struct vnode **vpp; | |
201 | { | |
202 | struct vnode *vp; | |
341568e0 JSP |
203 | |
204 | #ifdef KERNFS_DIAGNOSTIC | |
205 | printf("kernfs_root(mp = %x)\n", mp); | |
206 | #endif | |
207 | ||
208 | /* | |
209 | * Return locked reference to root. | |
210 | */ | |
211 | vp = VFSTOKERNFS(mp)->kf_root; | |
212 | VREF(vp); | |
213 | VOP_LOCK(vp); | |
214 | *vpp = vp; | |
215 | return (0); | |
216 | } | |
217 | ||
218 | kernfs_quotactl(mp, cmd, uid, arg, p) | |
219 | struct mount *mp; | |
220 | int cmd; | |
221 | uid_t uid; | |
222 | caddr_t arg; | |
223 | struct proc *p; | |
224 | { | |
225 | return (EOPNOTSUPP); | |
226 | } | |
227 | ||
228 | kernfs_statfs(mp, sbp, p) | |
229 | struct mount *mp; | |
230 | struct statfs *sbp; | |
231 | struct proc *p; | |
232 | { | |
233 | #ifdef KERNFS_DIAGNOSTIC | |
234 | printf("kernfs_statfs(mp = %x)\n", mp); | |
235 | #endif | |
236 | ||
237 | sbp->f_type = MOUNT_KERNFS; | |
238 | sbp->f_flags = 0; | |
239 | sbp->f_bsize = DEV_BSIZE; | |
240 | sbp->f_iosize = DEV_BSIZE; | |
241 | sbp->f_blocks = 2; /* 1K to keep df happy */ | |
242 | sbp->f_bfree = 0; | |
243 | sbp->f_bavail = 0; | |
fdcf3f78 JSP |
244 | sbp->f_files = 0; |
245 | sbp->f_ffree = 0; | |
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246 | if (sbp != &mp->mnt_stat) { |
247 | bcopy(&mp->mnt_stat.f_fsid, &sbp->f_fsid, sizeof(sbp->f_fsid)); | |
248 | bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN); | |
249 | bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN); | |
250 | } | |
251 | return (0); | |
252 | } | |
253 | ||
254 | kernfs_sync(mp, waitfor) | |
255 | struct mount *mp; | |
256 | int waitfor; | |
257 | { | |
258 | return (0); | |
259 | } | |
260 | ||
261 | /* | |
fdf8b1b4 | 262 | * Kernfs flat namespace lookup. |
341568e0 JSP |
263 | * Currently unsupported. |
264 | */ | |
265 | kernfs_vget(mp, ino, vpp) | |
266 | struct mount *mp; | |
267 | ino_t ino; | |
268 | struct vnode **vpp; | |
269 | { | |
270 | ||
271 | return (EOPNOTSUPP); | |
272 | } | |
273 | ||
274 | ||
275 | kernfs_fhtovp(mp, fhp, setgen, vpp) | |
276 | struct mount *mp; | |
277 | struct fid *fhp; | |
278 | int setgen; | |
279 | struct vnode **vpp; | |
280 | { | |
281 | return (EOPNOTSUPP); | |
282 | } | |
283 | ||
284 | kernfs_vptofh(vp, fhp) | |
285 | struct vnode *vp; | |
286 | struct fid *fhp; | |
287 | { | |
288 | return (EOPNOTSUPP); | |
289 | } | |
290 | ||
291 | struct vfsops kernfs_vfsops = { | |
292 | kernfs_mount, | |
293 | kernfs_start, | |
294 | kernfs_unmount, | |
295 | kernfs_root, | |
296 | kernfs_quotactl, | |
297 | kernfs_statfs, | |
298 | kernfs_sync, | |
299 | kernfs_vget, | |
300 | kernfs_fhtovp, | |
301 | kernfs_vptofh, | |
302 | kernfs_init, | |
303 | }; |