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36 * @(#)kernfs_vfsops.c 8.10 (Berkeley) 5/14/95
37 * $Id: kernfs_vfsops.c,v 1.26 1999/05/08 06:39:52 phk Exp $
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_init __P((struct vfsconf *vfsp));
61 static int kernfs_mount __P((struct mount *mp, char *path, caddr_t data,
62 struct nameidata *ndp, struct proc *p));
63 static int kernfs_start __P((struct mount *mp, int flags, struct proc *p));
64 static int kernfs_unmount __P((struct mount *mp, int mntflags,
66 static int kernfs_root __P((struct mount *mp, struct vnode **vpp));
67 static int kernfs_statfs __P((struct mount *mp, struct statfs *sbp,
85 /* Already did it once. */
90 if (!bdevsw(rootdev)) {
91 panic("root dev has no bdevsw");
95 for (cmaj = 0; cmaj < nchrdev; cmaj++) {
96 rrootdev = makedev(cmaj, minor(rootdev));
97 if (chrtoblk(rrootdev) == rootdev)
101 printf("kernfs_get_rrootdev: no raw root device\n");
105 * Mount the Kernel params filesystem
108 kernfs_mount(mp, path, data, ndp, p)
112 struct nameidata *ndp;
117 struct kernfs_mount *fmp;
120 #ifdef KERNFS_DIAGNOSTIC
121 printf("kernfs_mount(mp = %x)\n", mp);
127 if (mp->mnt_flag & MNT_UPDATE)
130 MALLOC(fmp, struct kernfs_mount *, sizeof(struct kernfs_mount),
131 M_KERNFSMNT, M_WAITOK); /* XXX */
133 error = getnewvnode(VT_KERNFS, mp, kernfs_vnodeop_p, &rvp); /* XXX */
135 FREE(fmp, M_KERNFSMNT);
140 rvp->v_flag |= VROOT;
141 #ifdef KERNFS_DIAGNOSTIC
142 printf("kernfs_mount: root vp = %x\n", rvp);
145 mp->mnt_flag |= MNT_LOCAL;
146 mp->mnt_data = (qaddr_t) fmp;
149 (void) copyinstr(path, mp->mnt_stat.f_mntonname, MNAMELEN - 1, &size);
150 bzero(mp->mnt_stat.f_mntonname + size, MNAMELEN - size);
151 bzero(mp->mnt_stat.f_mntfromname, MNAMELEN);
152 bcopy("kernfs", mp->mnt_stat.f_mntfromname, sizeof("kernfs"));
153 (void)kernfs_statfs(mp, &mp->mnt_stat, p);
154 #ifdef KERNFS_DIAGNOSTIC
155 printf("kernfs_mount: at %s\n", mp->mnt_stat.f_mntonname);
158 kernfs_get_rrootdev();
163 kernfs_start(mp, flags, p)
172 kernfs_unmount(mp, mntflags, p)
179 struct vnode *rootvp = VFSTOKERNFS(mp)->kf_root;
181 #ifdef KERNFS_DIAGNOSTIC
182 printf("kernfs_unmount(mp = %x)\n", mp);
185 if (mntflags & MNT_FORCE)
189 * Clear out buffer cache. I don't think we
190 * ever get anything cached at this level at the
191 * moment, but who knows...
193 if (rootvp->v_usecount > 1)
195 #ifdef KERNFS_DIAGNOSTIC
196 printf("kernfs_unmount: calling vflush\n");
198 error = vflush(mp, rootvp, flags);
202 #ifdef KERNFS_DIAGNOSTIC
203 vprint("kernfs root", rootvp);
206 * Release reference on underlying root vnode
210 * And blow it away for future re-use
214 * Finally, throw away the kernfs_mount structure
216 free(mp->mnt_data, M_KERNFSMNT); /* XXX */
226 struct proc *p = curproc; /* XXX */
229 #ifdef KERNFS_DIAGNOSTIC
230 printf("kernfs_root(mp = %x)\n", mp);
234 * Return locked reference to root.
236 vp = VFSTOKERNFS(mp)->kf_root;
238 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p);
244 kernfs_statfs(mp, sbp, p)
249 #ifdef KERNFS_DIAGNOSTIC
250 printf("kernfs_statfs(mp = %x)\n", mp);
254 sbp->f_bsize = DEV_BSIZE;
255 sbp->f_iosize = DEV_BSIZE;
256 sbp->f_blocks = 2; /* 1K to keep df happy */
261 if (sbp != &mp->mnt_stat) {
262 sbp->f_type = mp->mnt_vfc->vfc_typenum;
263 bcopy(&mp->mnt_stat.f_fsid, &sbp->f_fsid, sizeof(sbp->f_fsid));
264 bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN);
265 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN);
270 static struct vfsops kernfs_vfsops = {
284 VFS_SET(kernfs_vfsops, kernfs, VFCF_SYNTHETIC);