/* * 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 * $FreeBSD$ */ /* * Kernel params Filesystem */ #include #include #include #include #include #include #include #include #include static MALLOC_DEFINE(M_KERNFSMNT, "KERNFS mount", "KERNFS mount structure"); dev_t rrootdev = NODEV; static void kernfs_get_rrootdev __P((void)); static int kernfs_mount __P((struct mount *mp, char *path, caddr_t data, struct nameidata *ndp, struct proc *p)); static int kernfs_unmount __P((struct mount *mp, int mntflags, struct proc *p)); static int kernfs_root __P((struct mount *mp, struct vnode **vpp)); static int kernfs_statfs __P((struct mount *mp, struct statfs *sbp, struct proc *p)); static void kernfs_get_rrootdev() { static int tried = 0; struct cdevsw *sw; if (tried) { /* Already did it once. */ return; } tried = 1; sw = devsw(rootdev); if (!sw) return; if (rootdev == NODEV) return; rrootdev = makedev(sw->d_maj, minor(rootdev)); } /* * Mount the Kernel params filesystem */ static int kernfs_mount(mp, path, data, ndp, p) struct mount *mp; char *path; caddr_t data; struct nameidata *ndp; struct proc *p; { int error = 0; u_int size; struct kernfs_mount *fmp; struct vnode *rvp; #ifdef DEBUG printf("kernfs_mount(mp = %p)\n", (void *)mp); #endif /* * Update is a no-op */ if (mp->mnt_flag & MNT_UPDATE) return (EOPNOTSUPP); MALLOC(fmp, struct kernfs_mount *, sizeof(struct kernfs_mount), M_KERNFSMNT, M_WAITOK); /* XXX */ error = getnewvnode(VT_KERNFS, mp, kernfs_vnodeop_p, &rvp); /* XXX */ if (error) { FREE(fmp, M_KERNFSMNT); return (error); } rvp->v_type = VDIR; rvp->v_flag |= VROOT; #ifdef DEBUG printf("kernfs_mount: root vp = %p\n", (void *)rvp); #endif fmp->kf_root = rvp; mp->mnt_flag |= MNT_LOCAL; mp->mnt_data = (qaddr_t) fmp; vfs_getnewfsid(mp); (void) copyinstr(path, mp->mnt_stat.f_mntonname, MNAMELEN - 1, &size); bzero(mp->mnt_stat.f_mntonname + size, MNAMELEN - size); bzero(mp->mnt_stat.f_mntfromname, MNAMELEN); bcopy("kernfs", mp->mnt_stat.f_mntfromname, sizeof("kernfs")); (void)kernfs_statfs(mp, &mp->mnt_stat, p); #ifdef DEBUG printf("kernfs_mount: at %s\n", mp->mnt_stat.f_mntonname); #endif kernfs_get_rrootdev(); return (0); } static 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 DEBUG printf("kernfs_unmount(mp = %p)\n", (void *)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 DEBUG printf("kernfs_unmount: calling vflush\n"); #endif error = vflush(mp, rootvp, flags); if (error) return (error); #ifdef DEBUG vprint("kernfs root", rootvp); #endif /* * Release reference on underlying root vnode */ vrele(rootvp); /* * And blow it away for future re-use */ vgone(rootvp); /* * Finally, throw away the kernfs_mount structure */ free(mp->mnt_data, M_KERNFSMNT); /* XXX */ mp->mnt_data = 0; return 0; } static int kernfs_root(mp, vpp) struct mount *mp; struct vnode **vpp; { struct proc *p = curproc; /* XXX */ struct vnode *vp; #ifdef DEBUG printf("kernfs_root(mp = %p)\n", (void *)mp); #endif /* * Return locked reference to root. */ vp = VFSTOKERNFS(mp)->kf_root; VREF(vp); vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p); *vpp = vp; return (0); } static int kernfs_statfs(mp, sbp, p) struct mount *mp; struct statfs *sbp; struct proc *p; { #ifdef DEBUG printf("kernfs_statfs(mp = %p)\n", (void *)mp); #endif sbp->f_flags = 0; 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; if (sbp != &mp->mnt_stat) { sbp->f_type = mp->mnt_vfc->vfc_typenum; bcopy(&mp->mnt_stat.f_fsid, &sbp->f_fsid, sizeof(sbp->f_fsid)); bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN); bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN); } return (0); } static struct vfsops kernfs_vfsops = { kernfs_mount, vfs_stdstart, kernfs_unmount, kernfs_root, vfs_stdquotactl, kernfs_statfs, vfs_stdsync, vfs_stdvget, vfs_stdfhtovp, vfs_stdcheckexp, vfs_stdvptofh, vfs_stdinit, }; VFS_SET(kernfs_vfsops, kernfs, VFCF_SYNTHETIC);