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36 * @(#)kernfs_vfsops.c 8.10 (Berkeley) 5/14/95
37 * $Id: kernfs_vfsops.c,v 1.23 1998/09/07 13:17:01 bde 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,
82 int bmaj = major(rootdev);
86 /* Already did it once. */
92 panic("root dev has no bdevsw");
96 for (cmaj = 0; cmaj < nchrdev; cmaj++) {
97 rrootdev = makedev(cmaj, minor(rootdev));
98 if (chrtoblk(rrootdev) == rootdev)
102 printf("kernfs_get_rrootdev: no raw root device\n");
106 * Mount the Kernel params filesystem
109 kernfs_mount(mp, path, data, ndp, p)
113 struct nameidata *ndp;
118 struct kernfs_mount *fmp;
121 #ifdef KERNFS_DIAGNOSTIC
122 printf("kernfs_mount(mp = %x)\n", mp);
128 if (mp->mnt_flag & MNT_UPDATE)
131 MALLOC(fmp, struct kernfs_mount *, sizeof(struct kernfs_mount),
132 M_KERNFSMNT, M_WAITOK); /* XXX */
134 error = getnewvnode(VT_KERNFS, mp, kernfs_vnodeop_p, &rvp); /* XXX */
136 FREE(fmp, M_KERNFSMNT);
141 rvp->v_flag |= VROOT;
142 #ifdef KERNFS_DIAGNOSTIC
143 printf("kernfs_mount: root vp = %x\n", rvp);
146 mp->mnt_flag |= MNT_LOCAL;
147 mp->mnt_data = (qaddr_t) fmp;
150 (void) copyinstr(path, mp->mnt_stat.f_mntonname, MNAMELEN - 1, &size);
151 bzero(mp->mnt_stat.f_mntonname + size, MNAMELEN - size);
152 bzero(mp->mnt_stat.f_mntfromname, MNAMELEN);
153 bcopy("kernfs", mp->mnt_stat.f_mntfromname, sizeof("kernfs"));
154 (void)kernfs_statfs(mp, &mp->mnt_stat, p);
155 #ifdef KERNFS_DIAGNOSTIC
156 printf("kernfs_mount: at %s\n", mp->mnt_stat.f_mntonname);
159 kernfs_get_rrootdev();
164 kernfs_start(mp, flags, p)
173 kernfs_unmount(mp, mntflags, p)
180 struct vnode *rootvp = VFSTOKERNFS(mp)->kf_root;
182 #ifdef KERNFS_DIAGNOSTIC
183 printf("kernfs_unmount(mp = %x)\n", mp);
186 if (mntflags & MNT_FORCE)
190 * Clear out buffer cache. I don't think we
191 * ever get anything cached at this level at the
192 * moment, but who knows...
194 if (rootvp->v_usecount > 1)
196 #ifdef KERNFS_DIAGNOSTIC
197 printf("kernfs_unmount: calling vflush\n");
199 error = vflush(mp, rootvp, flags);
203 #ifdef KERNFS_DIAGNOSTIC
204 vprint("kernfs root", rootvp);
207 * Release reference on underlying root vnode
211 * And blow it away for future re-use
215 * Finally, throw away the kernfs_mount structure
217 free(mp->mnt_data, M_KERNFSMNT); /* XXX */
227 struct proc *p = curproc; /* XXX */
230 #ifdef KERNFS_DIAGNOSTIC
231 printf("kernfs_root(mp = %x)\n", mp);
235 * Return locked reference to root.
237 vp = VFSTOKERNFS(mp)->kf_root;
239 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p);
245 kernfs_statfs(mp, sbp, p)
250 #ifdef KERNFS_DIAGNOSTIC
251 printf("kernfs_statfs(mp = %x)\n", mp);
255 sbp->f_bsize = DEV_BSIZE;
256 sbp->f_iosize = DEV_BSIZE;
257 sbp->f_blocks = 2; /* 1K to keep df happy */
262 if (sbp != &mp->mnt_stat) {
263 sbp->f_type = mp->mnt_vfc->vfc_typenum;
264 bcopy(&mp->mnt_stat.f_fsid, &sbp->f_fsid, sizeof(sbp->f_fsid));
265 bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN);
266 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN);
271 static struct vfsops kernfs_vfsops = {
285 VFS_SET(kernfs_vfsops, kernfs, VFCF_SYNTHETIC);