/*- * 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. * 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. * * @(#)portal_vfsops.c 8.11 (Berkeley) 5/14/95 * * $FreeBSD$ */ /* * Portal Filesystem */ #include #include #include #include #include #include #include #include #include #include /* Must come after sys/malloc.h */ #include #include #include #include #include #include #include static MALLOC_DEFINE(M_PORTALFSMNT, "portal_mount", "PORTAL mount structure"); static vfs_unmount_t portal_unmount; static vfs_root_t portal_root; static vfs_statfs_t portal_statfs; static const char *portal_opts[] = { "socket", "config", NULL }; static int portal_cmount(struct mntarg *ma, void *data, uint64_t flags) { struct portal_args args; int error; if (data == NULL) return (EINVAL); error = copyin(data, &args, sizeof args); if (error) return (error); ma = mount_argf(ma, "socket", "%d", args.pa_socket); ma = mount_argsu(ma, "config", args.pa_config, MAXPATHLEN); error = kernel_mount(ma, flags); return (error); } /* * Mount the per-process file descriptors (/dev/fd) */ static int portal_mount(struct mount *mp) { struct file *fp; struct portalmount *fmp; struct socket *so; struct vnode *rvp; struct thread *td; struct portalnode *pn; int error, v; char *p; td = curthread; if (vfs_filteropt(mp->mnt_optnew, portal_opts)) return (EINVAL); error = vfs_scanopt(mp->mnt_optnew, "socket", "%d", &v); if (error != 1) return (EINVAL); error = vfs_getopt(mp->mnt_optnew, "config", (void **)&p, NULL); if (error) return (error); /* * Capsicum is not incompatible with portalfs, but we don't really * know what rights are required. In the spirit of "better safe than * sorry", pretend that all rights are required for now. */ if ((error = fget(td, v, CAP_MASK_VALID, &fp)) != 0) return (error); if (fp->f_type != DTYPE_SOCKET) { fdrop(fp, td); return(ENOTSOCK); } so = fp->f_data; /* XXX race against userland */ if (so->so_proto->pr_domain->dom_family != AF_UNIX) { fdrop(fp, td); return (ESOCKTNOSUPPORT); } pn = malloc(sizeof(struct portalnode), M_TEMP, M_WAITOK); fmp = malloc(sizeof(struct portalmount), M_PORTALFSMNT, M_WAITOK); /* XXX */ error = getnewvnode("portal", mp, &portal_vnodeops, &rvp); /* XXX */ if (error) { free(fmp, M_PORTALFSMNT); free(pn, M_TEMP); fdrop(fp, td); return (error); } error = insmntque(rvp, mp); /* XXX: Too early for mpsafe fs */ if (error != 0) { free(fmp, M_PORTALFSMNT); free(pn, M_TEMP); fdrop(fp, td); return (error); } rvp->v_data = pn; rvp->v_type = VDIR; rvp->v_vflag |= VV_ROOT; VTOPORTAL(rvp)->pt_arg = 0; VTOPORTAL(rvp)->pt_size = 0; VTOPORTAL(rvp)->pt_fileid = PORTAL_ROOTFILEID; fmp->pm_root = rvp; fhold(fp); fmp->pm_server = fp; MNT_ILOCK(mp); mp->mnt_flag |= MNT_LOCAL; MNT_IUNLOCK(mp); mp->mnt_data = fmp; vfs_getnewfsid(mp); vfs_mountedfrom(mp, p); fdrop(fp, td); return (0); } static int portal_unmount(mp, mntflags) struct mount *mp; int mntflags; { int error, flags = 0; 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... */ #ifdef notyet mntflushbuf(mp, 0); if (mntinvalbuf(mp, 1)) return (EBUSY); #endif /* There is 1 extra root vnode reference (pm_root). */ error = vflush(mp, 1, flags, curthread); if (error) return (error); /* * Shutdown the socket. This will cause the select in the * daemon to wake up, and then the accept will get ECONNABORTED * which it interprets as a request to go and bury itself. */ soshutdown(VFSTOPORTAL(mp)->pm_server->f_data, 2); /* * Discard reference to underlying file. Must call closef because * this may be the last reference. */ closef(VFSTOPORTAL(mp)->pm_server, (struct thread *) 0); /* * Finally, throw away the portalmount structure */ free(mp->mnt_data, M_PORTALFSMNT); /* XXX */ mp->mnt_data = NULL; return (0); } static int portal_root(mp, flags, vpp) struct mount *mp; int flags; struct vnode **vpp; { struct vnode *vp; /* * Return locked reference to root. */ vp = VFSTOPORTAL(mp)->pm_root; VREF(vp); vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); *vpp = vp; return (0); } static int portal_statfs(mp, sbp) struct mount *mp; struct statfs *sbp; { 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 = 1; /* Allow for "." */ sbp->f_ffree = 0; /* See comments above */ return (0); } static struct vfsops portal_vfsops = { .vfs_cmount = portal_cmount, .vfs_mount = portal_mount, .vfs_root = portal_root, .vfs_statfs = portal_statfs, .vfs_unmount = portal_unmount, }; VFS_SET(portal_vfsops, portalfs, VFCF_SYNTHETIC);