/* $NetBSD: kernfs_vfsops.c,v 1.36 2000/03/16 18:08:25 jdolecek Exp $ */ /* * Copyright (c) 1992, 1993, 1995 * The Regents of the University of California. All rights reserved. * * This code is derived from software donated to Berkeley by * Jan-Simon Pendry. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * @(#)kernfs_vfsops.c 8.10 (Berkeley) 5/14/95 */ /* * Kernel params Filesystem */ #if defined(_KERNEL) && !defined(_LKM) #include "opt_compat_netbsd.h" #endif #include #include #include #include #include #include #include #include #include #include #include dev_t rrootdev = NODEV; void kernfs_init __P((void)); void kernfs_done __P((void)); void kernfs_get_rrootdev __P((void)); int kernfs_mount __P((struct mount *, const char *, void *, struct nameidata *, struct proc *)); int kernfs_start __P((struct mount *, int, struct proc *)); int kernfs_unmount __P((struct mount *, int, struct proc *)); int kernfs_root __P((struct mount *, struct vnode **)); int kernfs_statfs __P((struct mount *, struct statfs *, struct proc *)); int kernfs_quotactl __P((struct mount *, int, uid_t, caddr_t, struct proc *)); int kernfs_sync __P((struct mount *, int, struct ucred *, struct proc *)); int kernfs_vget __P((struct mount *, ino_t, struct vnode **)); int kernfs_fhtovp __P((struct mount *, struct fid *, struct vnode **)); int kernfs_checkexp __P((struct mount *, struct mbuf *, int *, struct ucred **)); int kernfs_vptofh __P((struct vnode *, struct fid *)); int kernfs_sysctl __P((int *, u_int, void *, size_t *, void *, size_t, struct proc *)); void kernfs_init() { } void kernfs_done() { } void kernfs_get_rrootdev() { static int tried = 0; int cmaj; if (tried) { /* Already did it once. */ return; } tried = 1; if (rootdev == NODEV) return; for (cmaj = 0; cmaj < nchrdev; cmaj++) { rrootdev = makedev(cmaj, minor(rootdev)); if (chrtoblk(rrootdev) == rootdev) return; } rrootdev = NODEV; printf("kernfs_get_rrootdev: no raw root device\n"); } /* * Mount the Kernel params filesystem */ int kernfs_mount(mp, path, data, ndp, p) struct mount *mp; const char *path; void *data; struct nameidata *ndp; struct proc *p; { int error = 0; size_t size; struct kernfs_mount *fmp; struct vnode *rvp; #ifdef KERNFS_DIAGNOSTIC printf("kernfs_mount(mp = %p)\n", mp); #endif /* * Update is a no-op */ if (mp->mnt_flag & MNT_UPDATE) return (EOPNOTSUPP); error = getnewvnode(VT_KERNFS, mp, kernfs_vnodeop_p, &rvp); if (error) return (error); MALLOC(fmp, struct kernfs_mount *, sizeof(struct kernfs_mount), M_MISCFSMNT, M_WAITOK); rvp->v_type = VDIR; rvp->v_flag |= VROOT; #ifdef KERNFS_DIAGNOSTIC printf("kernfs_mount: root vp = %p\n", rvp); #endif fmp->kf_root = rvp; mp->mnt_flag |= MNT_LOCAL; mp->mnt_data = (qaddr_t)fmp; vfs_getnewfsid(mp, MOUNT_KERNFS); (void) copyinstr(path, mp->mnt_stat.f_mntonname, MNAMELEN - 1, &size); memset(mp->mnt_stat.f_mntonname + size, 0, MNAMELEN - size); memset(mp->mnt_stat.f_mntfromname, 0, MNAMELEN); memcpy(mp->mnt_stat.f_mntfromname, "kernfs", sizeof("kernfs")); #ifdef KERNFS_DIAGNOSTIC printf("kernfs_mount: at %s\n", mp->mnt_stat.f_mntonname); #endif kernfs_get_rrootdev(); return (0); } int kernfs_start(mp, flags, p) struct mount *mp; int flags; struct proc *p; { return (0); } int kernfs_unmount(mp, mntflags, p) struct mount *mp; int mntflags; struct proc *p; { int error; int flags = 0; struct vnode *rootvp = VFSTOKERNFS(mp)->kf_root; #ifdef KERNFS_DIAGNOSTIC printf("kernfs_unmount(mp = %p)\n", mp); #endif if (mntflags & MNT_FORCE) flags |= FORCECLOSE; /* * Clear out buffer cache. I don't think we * ever get anything cached at this level at the * moment, but who knows... */ if (rootvp->v_usecount > 1) return (EBUSY); #ifdef KERNFS_DIAGNOSTIC printf("kernfs_unmount: calling vflush\n"); #endif if ((error = vflush(mp, rootvp, flags)) != 0) return (error); #ifdef KERNFS_DIAGNOSTIC vprint("kernfs root", rootvp); #endif /* * Clean out the old root vnode for reuse. */ vrele(rootvp); vgone(rootvp); /* * Finally, throw away the kernfs_mount structure */ free(mp->mnt_data, M_MISCFSMNT); mp->mnt_data = 0; return (0); } int kernfs_root(mp, vpp) struct mount *mp; struct vnode **vpp; { struct vnode *vp; #ifdef KERNFS_DIAGNOSTIC printf("kernfs_root(mp = %p)\n", mp); #endif /* * Return locked reference to root. */ vp = VFSTOKERNFS(mp)->kf_root; VREF(vp); vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); *vpp = vp; return (0); } int kernfs_quotactl(mp, cmd, uid, arg, p) struct mount *mp; int cmd; uid_t uid; caddr_t arg; struct proc *p; { return (EOPNOTSUPP); } int kernfs_statfs(mp, sbp, p) struct mount *mp; struct statfs *sbp; struct proc *p; { #ifdef KERNFS_DIAGNOSTIC printf("kernfs_statfs(mp = %p)\n", mp); #endif sbp->f_bsize = DEV_BSIZE; sbp->f_iosize = DEV_BSIZE; sbp->f_blocks = 2; /* 1K to keep df happy */ sbp->f_bfree = 0; sbp->f_bavail = 0; sbp->f_files = 0; sbp->f_ffree = 0; #ifdef COMPAT_09 sbp->f_type = 7; #else sbp->f_type = 0; #endif if (sbp != &mp->mnt_stat) { memcpy(&sbp->f_fsid, &mp->mnt_stat.f_fsid, sizeof(sbp->f_fsid)); memcpy(sbp->f_mntonname, mp->mnt_stat.f_mntonname, MNAMELEN); memcpy(sbp->f_mntfromname, mp->mnt_stat.f_mntfromname, MNAMELEN); } strncpy(sbp->f_fstypename, mp->mnt_op->vfs_name, MFSNAMELEN); return (0); } /*ARGSUSED*/ int kernfs_sync(mp, waitfor, uc, p) struct mount *mp; int waitfor; struct ucred *uc; struct proc *p; { return (0); } /* * Kernfs flat namespace lookup. * Currently unsupported. */ int kernfs_vget(mp, ino, vpp) struct mount *mp; ino_t ino; struct vnode **vpp; { return (EOPNOTSUPP); } /*ARGSUSED*/ int kernfs_fhtovp(mp, fhp, vpp) struct mount *mp; struct fid *fhp; struct vnode **vpp; { return (EOPNOTSUPP); } /*ARGSUSED*/ int kernfs_checkexp(mp, mb, what, anon) struct mount *mp; struct mbuf *mb; int *what; struct ucred **anon; { return (EOPNOTSUPP); } /*ARGSUSED*/ int kernfs_vptofh(vp, fhp) struct vnode *vp; struct fid *fhp; { return (EOPNOTSUPP); } int kernfs_sysctl(name, namelen, oldp, oldlenp, newp, newlen, p) int *name; u_int namelen; void *oldp; size_t *oldlenp; void *newp; size_t newlen; struct proc *p; { return (EOPNOTSUPP); } extern struct vnodeopv_desc kernfs_vnodeop_opv_desc; struct vnodeopv_desc *kernfs_vnodeopv_descs[] = { &kernfs_vnodeop_opv_desc, NULL, }; struct vfsops kernfs_vfsops = { MOUNT_KERNFS, kernfs_mount, kernfs_start, kernfs_unmount, kernfs_root, kernfs_quotactl, kernfs_statfs, kernfs_sync, kernfs_vget, kernfs_fhtovp, kernfs_vptofh, kernfs_init, kernfs_done, kernfs_sysctl, NULL, /* vfs_mountroot */ kernfs_checkexp, kernfs_vnodeopv_descs, };