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36 * @(#)kernfs_vfsops.c 8.10 (Berkeley) 5/14/95
41 * Kernel params Filesystem
44 #include <sys/param.h>
45 #include <sys/systm.h>
46 #include <sys/kernel.h>
49 #include <sys/vnode.h>
50 #include <sys/mount.h>
51 #include <sys/malloc.h>
53 #include <miscfs/kernfs/kernfs.h>
55 static MALLOC_DEFINE(M_KERNFSMNT, "KERNFS mount", "KERNFS mount structure");
57 dev_t rrootdev = NODEV;
59 static void kernfs_get_rrootdev __P((void));
60 static int kernfs_mount __P((struct mount *mp, char *path, caddr_t data,
61 struct nameidata *ndp, struct proc *p));
62 static int kernfs_unmount __P((struct mount *mp, int mntflags,
64 static int kernfs_root __P((struct mount *mp, struct vnode **vpp));
65 static int kernfs_statfs __P((struct mount *mp, struct statfs *sbp,
75 /* Already did it once. */
85 rrootdev = makedev(sw->d_maj, minor(rootdev));
89 * Mount the Kernel params filesystem
92 kernfs_mount(mp, path, data, ndp, p)
96 struct nameidata *ndp;
101 struct kernfs_mount *fmp;
105 printf("kernfs_mount(mp = %p)\n", (void *)mp);
111 if (mp->mnt_flag & MNT_UPDATE)
114 MALLOC(fmp, struct kernfs_mount *, sizeof(struct kernfs_mount),
115 M_KERNFSMNT, M_WAITOK); /* XXX */
117 error = getnewvnode(VT_KERNFS, mp, kernfs_vnodeop_p, &rvp); /* XXX */
119 FREE(fmp, M_KERNFSMNT);
124 rvp->v_flag |= VROOT;
126 printf("kernfs_mount: root vp = %p\n", (void *)rvp);
129 mp->mnt_flag |= MNT_LOCAL;
130 mp->mnt_data = (qaddr_t) fmp;
133 (void) copyinstr(path, mp->mnt_stat.f_mntonname, MNAMELEN - 1, &size);
134 bzero(mp->mnt_stat.f_mntonname + size, MNAMELEN - size);
135 bzero(mp->mnt_stat.f_mntfromname, MNAMELEN);
136 bcopy("kernfs", mp->mnt_stat.f_mntfromname, sizeof("kernfs"));
137 (void)kernfs_statfs(mp, &mp->mnt_stat, p);
139 printf("kernfs_mount: at %s\n", mp->mnt_stat.f_mntonname);
142 kernfs_get_rrootdev();
147 kernfs_unmount(mp, mntflags, p)
154 struct vnode *rootvp = VFSTOKERNFS(mp)->kf_root;
157 printf("kernfs_unmount(mp = %p)\n", (void *)mp);
160 if (mntflags & MNT_FORCE)
164 * Clear out buffer cache. I don't think we
165 * ever get anything cached at this level at the
166 * moment, but who knows...
168 if (rootvp->v_usecount > 1)
171 printf("kernfs_unmount: calling vflush\n");
173 error = vflush(mp, rootvp, flags);
178 vprint("kernfs root", rootvp);
181 * Release reference on underlying root vnode
185 * And blow it away for future re-use
189 * Finally, throw away the kernfs_mount structure
191 free(mp->mnt_data, M_KERNFSMNT); /* XXX */
201 struct proc *p = curproc; /* XXX */
205 printf("kernfs_root(mp = %p)\n", (void *)mp);
209 * Return locked reference to root.
211 vp = VFSTOKERNFS(mp)->kf_root;
213 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p);
219 kernfs_statfs(mp, sbp, p)
225 printf("kernfs_statfs(mp = %p)\n", (void *)mp);
229 sbp->f_bsize = DEV_BSIZE;
230 sbp->f_iosize = DEV_BSIZE;
231 sbp->f_blocks = 2; /* 1K to keep df happy */
236 if (sbp != &mp->mnt_stat) {
237 sbp->f_type = mp->mnt_vfc->vfc_typenum;
238 bcopy(&mp->mnt_stat.f_fsid, &sbp->f_fsid, sizeof(sbp->f_fsid));
239 bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN);
240 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN);
245 static struct vfsops kernfs_vfsops = {
260 VFS_SET(kernfs_vfsops, kernfs, VFCF_SYNTHETIC);