/* * Copyright (c) 2000 Apple Computer, Inc. All rights reserved. * * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ * * This file contains Original Code and/or Modifications of Original Code * as defined in and that are subject to the Apple Public Source License * Version 2.0 (the 'License'). You may not use this file except in * compliance with the License. The rights granted to you under the License * may not be used to create, or enable the creation or redistribution of, * unlawful or unlicensed copies of an Apple operating system, or to * circumvent, violate, or enable the circumvention or violation of, any * terms of an Apple operating system software license agreement. * * Please obtain a copy of the License at * http://www.opensource.apple.com/apsl/ and read it before using this file. * * The Original Code and all software distributed under the License are * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. * Please see the License for the specific language governing rights and * limitations under the License. * * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ */ /* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */ /* * 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. * * @(#)fdesc_vfsops.c 8.10 (Berkeley) 5/14/95 * */ /* * /dev/fd Filesystem */ #include <sys/param.h> #include <sys/systm.h> #include <sys/time.h> #include <sys/types.h> #include <sys/proc_internal.h> #include <sys/resourcevar.h> #include <sys/filedesc.h> #include <sys/vnode.h> #include <sys/mount_internal.h> #include <sys/namei.h> #include <sys/malloc.h> #include <miscfs/fdesc/fdesc.h> /* * Mount the per-process file descriptors (/dev/fd) */ int fdesc_mount(struct mount *mp, vnode_t devvp, __unused user_addr_t data, vfs_context_t context) { int error = 0; struct fdescmount *fmp; struct vnode *rvp; /* * Update is a no-op */ if (mp->mnt_flag & MNT_UPDATE) return (ENOTSUP); error = fdesc_allocvp(Froot, FD_ROOT, mp, &rvp, VDIR); if (error) return (error); MALLOC(fmp, struct fdescmount *, sizeof(struct fdescmount), M_UFSMNT, M_WAITOK); /* XXX */ vnode_setnoflush(rvp); vnode_ref(rvp); vnode_put(rvp); fmp->f_root = rvp; /* XXX -- don't mark as local to work around fts() problems */ /*mp->mnt_flag |= MNT_LOCAL;*/ mp->mnt_data = (qaddr_t) fmp; vfs_getnewfsid(mp); bzero(mp->mnt_vfsstat.f_mntfromname, MAXPATHLEN); bcopy("fdesc", mp->mnt_vfsstat.f_mntfromname, sizeof("fdesc")); return (0); } int fdesc_start(mp, flags, context) struct mount *mp; int flags; vfs_context_t context; { return (0); } int fdesc_unmount(mp, mntflags, context) struct mount *mp; int mntflags; vfs_context_t context; { int error; int flags = 0; int force = 0; struct vnode *rvp = VFSTOFDESC(mp)->f_root; if (mntflags & MNT_FORCE) { flags |= FORCECLOSE; force = 1; } if ( vnode_isinuse(rvp, 1) && !force ) return (EBUSY); if ( (error = vflush(mp, rvp, flags|SKIPSYSTEM)) && !force ) return (error); /* * And mark for recycle after we drop its reference; it away for future re-use */ vnode_recycle(rvp); /* * Release reference on underlying root vnode */ vnode_rele(rvp); /* * Finally, throw away the fdescmount structure */ _FREE(mp->mnt_data, M_UFSMNT); /* XXX */ mp->mnt_data = 0; return (0); } int fdesc_root(mp, vpp, context) struct mount *mp; struct vnode **vpp; vfs_context_t context; { struct vnode *vp; /* * Return locked reference to root. */ vp = VFSTOFDESC(mp)->f_root; vnode_get(vp); *vpp = vp; return (0); } int fdesc_statfs(mp, sbp, context) struct mount *mp; struct vfsstatfs *sbp; vfs_context_t context; { struct proc *p = vfs_context_proc(context); struct filedesc *fdp; int lim; int i; int last; int freefd; /* * Compute number of free file descriptors. * [ Strange results will ensue if the open file * limit is ever reduced below the current number * of open files... ] */ lim = p->p_rlimit[RLIMIT_NOFILE].rlim_cur; fdp = p->p_fd; last = min(fdp->fd_nfiles, lim); freefd = 0; for (i = fdp->fd_freefile; i < last; i++) if (fdp->fd_ofiles[i] == NULL && !(fdp->fd_ofileflags[i] & UF_RESERVED)) freefd++; /* * Adjust for the fact that the fdesc array may not * have been fully allocated yet. */ if (fdp->fd_nfiles < lim) freefd += (lim - fdp->fd_nfiles); sbp->f_flags = 0; sbp->f_bsize = DEV_BSIZE; sbp->f_iosize = DEV_BSIZE; sbp->f_blocks = (uint64_t)2; /* 1K to keep df happy */ sbp->f_bfree = 0; sbp->f_bavail = 0; sbp->f_files = (uint64_t)((unsigned long)(lim + 1)); /* Allow for "." */ sbp->f_ffree = (uint64_t)((unsigned long)freefd); /* See comments above */ return (0); } static int fdesc_vfs_getattr(mount_t mp, struct vfs_attr *fsap, vfs_context_t context) { VFSATTR_RETURN(fsap, f_bsize, DEV_BSIZE); VFSATTR_RETURN(fsap, f_iosize, DEV_BSIZE); VFSATTR_RETURN(fsap, f_blocks, 2); VFSATTR_RETURN(fsap, f_bfree, 0); VFSATTR_RETURN(fsap, f_bavail, 0); VFSATTR_RETURN(fsap, f_fssubtype, 0); if (VFSATTR_IS_ACTIVE(fsap, f_objcount) || VFSATTR_IS_ACTIVE(fsap, f_maxobjcount) || VFSATTR_IS_ACTIVE(fsap, f_files) || VFSATTR_IS_ACTIVE(fsap, f_ffree)) { struct proc *p = vfs_context_proc(context); struct filedesc *fdp; int lim; int i; int last; int freefd; /* * Compute number of free file descriptors. * [ Strange results will ensue if the open file * limit is ever reduced below the current number * of open files... ] */ lim = p->p_rlimit[RLIMIT_NOFILE].rlim_cur; fdp = p->p_fd; last = min(fdp->fd_nfiles, lim); freefd = 0; for (i = fdp->fd_freefile; i < last; i++) if (fdp->fd_ofiles[i] == NULL && !(fdp->fd_ofileflags[i] & UF_RESERVED)) freefd++; /* * Adjust for the fact that the fdesc array may not * have been fully allocated yet. */ if (fdp->fd_nfiles < lim) freefd += (lim - fdp->fd_nfiles); VFSATTR_RETURN(fsap, f_objcount, lim+1); VFSATTR_RETURN(fsap, f_maxobjcount, lim+1); VFSATTR_RETURN(fsap, f_files, lim+1); VFSATTR_RETURN(fsap, f_ffree, freefd); } return 0; } int fdesc_sync(mp, waitfor, context) struct mount *mp; int waitfor; vfs_context_t context; { return (0); } #define fdesc_fhtovp (int (*) (mount_t, int, unsigned char *, vnode_t *, vfs_context_t))eopnotsupp #define fdesc_sysctl (int (*) (int *, u_int, user_addr_t, size_t *, user_addr_t, size_t, vfs_context_t))eopnotsupp #define fdesc_vget (int (*) (mount_t, ino64_t, vnode_t *, vfs_context_t))eopnotsupp #define fdesc_vptofh (int (*) (vnode_t, int *, unsigned char *, vfs_context_t))eopnotsupp struct vfsops fdesc_vfsops = { fdesc_mount, fdesc_start, fdesc_unmount, fdesc_root, NULL, /* quotactl */ fdesc_vfs_getattr, fdesc_sync, fdesc_vget, fdesc_fhtovp, fdesc_vptofh, fdesc_init, fdesc_sysctl };