/netbsd/src/sys/kern/vfs_syscalls.c
C | 2114 lines | 1609 code | 115 blank | 390 comment | 363 complexity | 2e4908f50cc0f97808dd585eea860811 MD5 | raw file
Possible License(s): GPL-2.0
- /* $NetBSD: vfs_syscalls.c,v 1.71 1996/04/23 10:29:02 mycroft Exp $ */
- /*
- * Copyright (c) 1989, 1993
- * The Regents of the University of California. All rights reserved.
- * (c) UNIX System Laboratories, Inc.
- * All or some portions of this file are derived from material licensed
- * to the University of California by American Telephone and Telegraph
- * Co. or Unix System Laboratories, Inc. and are reproduced herein with
- * the permission of UNIX System Laboratories, Inc.
- *
- * 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.
- *
- * @(#)vfs_syscalls.c 8.28 (Berkeley) 12/10/94
- */
- #include <sys/param.h>
- #include <sys/systm.h>
- #include <sys/namei.h>
- #include <sys/filedesc.h>
- #include <sys/kernel.h>
- #include <sys/file.h>
- #include <sys/stat.h>
- #include <sys/vnode.h>
- #include <sys/mount.h>
- #include <sys/proc.h>
- #include <sys/uio.h>
- #include <sys/malloc.h>
- #include <sys/dirent.h>
- #include <sys/syscallargs.h>
- #include <vm/vm.h>
- #include <sys/sysctl.h>
- static int change_dir __P((struct nameidata *, struct proc *));
- void checkdirs __P((struct vnode *));
- int dounmount __P((struct mount *, int, struct proc *));
- /*
- * Virtual File System System Calls
- */
- /*
- * Mount a file system.
- */
- /* ARGSUSED */
- int
- sys_mount(p, v, retval)
- struct proc *p;
- void *v;
- register_t *retval;
- {
- register struct sys_mount_args /* {
- syscallarg(char *) type;
- syscallarg(char *) path;
- syscallarg(int) flags;
- syscallarg(caddr_t) data;
- } */ *uap = v;
- register struct vnode *vp;
- register struct mount *mp;
- int error, flag = 0;
- u_long fsindex = 0;
- char fstypename[MFSNAMELEN];
- struct vattr va;
- struct nameidata nd;
- /*
- * Get vnode to be covered
- */
- NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE,
- SCARG(uap, path), p);
- if ((error = namei(&nd)) != 0)
- return (error);
- vp = nd.ni_vp;
- if (SCARG(uap, flags) & MNT_UPDATE) {
- if ((vp->v_flag & VROOT) == 0) {
- vput(vp);
- return (EINVAL);
- }
- mp = vp->v_mount;
- flag = mp->mnt_flag;
- /*
- * We only allow the filesystem to be reloaded if it
- * is currently mounted read-only.
- */
- if ((SCARG(uap, flags) & MNT_RELOAD) &&
- ((mp->mnt_flag & MNT_RDONLY) == 0)) {
- vput(vp);
- return (EOPNOTSUPP); /* Needs translation */
- }
- mp->mnt_flag |=
- SCARG(uap, flags) & (MNT_RELOAD | MNT_FORCE | MNT_UPDATE);
- /*
- * Only root, or the user that did the original mount is
- * permitted to update it.
- */
- if (mp->mnt_stat.f_owner != p->p_ucred->cr_uid &&
- (error = suser(p->p_ucred, &p->p_acflag))) {
- vput(vp);
- return (error);
- }
- /*
- * Do not allow NFS export by non-root users. Silently
- * enforce MNT_NOSUID and MNT_NODEV for non-root users.
- */
- if (p->p_ucred->cr_uid != 0) {
- if (SCARG(uap, flags) & MNT_EXPORTED) {
- vput(vp);
- return (EPERM);
- }
- SCARG(uap, flags) |= MNT_NOSUID | MNT_NODEV;
- }
- VOP_UNLOCK(vp);
- goto update;
- }
- /*
- * If the user is not root, ensure that they own the directory
- * onto which we are attempting to mount.
- */
- if ((error = VOP_GETATTR(vp, &va, p->p_ucred, p)) ||
- (va.va_uid != p->p_ucred->cr_uid &&
- (error = suser(p->p_ucred, &p->p_acflag)))) {
- vput(vp);
- return (error);
- }
- /*
- * Do not allow NFS export by non-root users. Silently
- * enforce MNT_NOSUID and MNT_NODEV for non-root users.
- */
- if (p->p_ucred->cr_uid != 0) {
- if (SCARG(uap, flags) & MNT_EXPORTED) {
- vput(vp);
- return (EPERM);
- }
- SCARG(uap, flags) |= MNT_NOSUID | MNT_NODEV;
- }
- if ((error = vinvalbuf(vp, V_SAVE, p->p_ucred, p, 0, 0)) != 0)
- return (error);
- if (vp->v_type != VDIR) {
- vput(vp);
- return (ENOTDIR);
- }
- error = copyinstr(SCARG(uap, type), fstypename, MFSNAMELEN, NULL);
- if (error) {
- #if defined(COMPAT_09) || defined(COMPAT_43)
- /*
- * Historically filesystem types were identified by number.
- * If we get an integer for the filesystem type instead of a
- * string, we check to see if it matches one of the historic
- * filesystem types.
- */
- fsindex = (u_long)SCARG(uap, type);
- if (fsindex >= nvfssw || vfssw[fsindex] == NULL) {
- vput(vp);
- return (ENODEV);
- }
- strncpy(fstypename, vfssw[fsindex]->vfs_name, MFSNAMELEN);
- #else
- vput(vp);
- return (error);
- #endif
- }
- #ifdef COMPAT_10
- /* Accept `ufs' as an alias for `ffs'. */
- if (!strncmp(fstypename, "ufs", MFSNAMELEN))
- strncpy(fstypename, "ffs", MFSNAMELEN);
- #endif
- for (fsindex = 0; fsindex < nvfssw; fsindex++)
- if (vfssw[fsindex] != NULL &&
- !strncmp(vfssw[fsindex]->vfs_name, fstypename, MFSNAMELEN))
- break;
- if (fsindex >= nvfssw) {
- vput(vp);
- return (ENODEV);
- }
- if (vp->v_mountedhere != NULL) {
- vput(vp);
- return (EBUSY);
- }
- /*
- * Allocate and initialize the file system.
- */
- mp = (struct mount *)malloc((u_long)sizeof(struct mount),
- M_MOUNT, M_WAITOK);
- bzero((char *)mp, (u_long)sizeof(struct mount));
- mp->mnt_op = vfssw[fsindex];
- if ((error = vfs_lock(mp)) != 0) {
- free((caddr_t)mp, M_MOUNT);
- vput(vp);
- return (error);
- }
- /* Do this early in case we block later. */
- vfssw[fsindex]->vfs_refcount++;
- vp->v_mountedhere = mp;
- mp->mnt_vnodecovered = vp;
- mp->mnt_stat.f_owner = p->p_ucred->cr_uid;
- update:
- /*
- * Set the mount level flags.
- */
- if (SCARG(uap, flags) & MNT_RDONLY)
- mp->mnt_flag |= MNT_RDONLY;
- else if (mp->mnt_flag & MNT_RDONLY)
- mp->mnt_flag |= MNT_WANTRDWR;
- mp->mnt_flag &=~ (MNT_NOSUID | MNT_NOEXEC | MNT_NODEV |
- MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC);
- mp->mnt_flag |= SCARG(uap, flags) & (MNT_NOSUID | MNT_NOEXEC |
- MNT_NODEV | MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC);
- /*
- * Mount the filesystem.
- */
- error = VFS_MOUNT(mp, SCARG(uap, path), SCARG(uap, data), &nd, p);
- if (mp->mnt_flag & MNT_UPDATE) {
- vrele(vp);
- if (mp->mnt_flag & MNT_WANTRDWR)
- mp->mnt_flag &= ~MNT_RDONLY;
- mp->mnt_flag &=~
- (MNT_UPDATE | MNT_RELOAD | MNT_FORCE | MNT_WANTRDWR);
- if (error)
- mp->mnt_flag = flag;
- return (error);
- }
- /*
- * Put the new filesystem on the mount list after root.
- */
- cache_purge(vp);
- if (!error) {
- CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list);
- checkdirs(vp);
- VOP_UNLOCK(vp);
- vfs_unlock(mp);
- (void) VFS_STATFS(mp, &mp->mnt_stat, p);
- error = VFS_START(mp, 0, p);
- } else {
- mp->mnt_vnodecovered->v_mountedhere = (struct mount *)0;
- vfssw[fsindex]->vfs_refcount--;
- vfs_unlock(mp);
- free((caddr_t)mp, M_MOUNT);
- vput(vp);
- }
- return (error);
- }
- /*
- * Scan all active processes to see if any of them have a current
- * or root directory onto which the new filesystem has just been
- * mounted. If so, replace them with the new mount point.
- */
- void
- checkdirs(olddp)
- struct vnode *olddp;
- {
- struct filedesc *fdp;
- struct vnode *newdp;
- struct proc *p;
- if (olddp->v_usecount == 1)
- return;
- if (VFS_ROOT(olddp->v_mountedhere, &newdp))
- panic("mount: lost mount");
- for (p = allproc.lh_first; p != 0; p = p->p_list.le_next) {
- fdp = p->p_fd;
- if (fdp->fd_cdir == olddp) {
- vrele(fdp->fd_cdir);
- VREF(newdp);
- fdp->fd_cdir = newdp;
- }
- if (fdp->fd_rdir == olddp) {
- vrele(fdp->fd_rdir);
- VREF(newdp);
- fdp->fd_rdir = newdp;
- }
- }
- if (rootvnode == olddp) {
- vrele(rootvnode);
- VREF(newdp);
- rootvnode = newdp;
- }
- vput(newdp);
- }
- /*
- * Unmount a file system.
- *
- * Note: unmount takes a path to the vnode mounted on as argument,
- * not special file (as before).
- */
- /* ARGSUSED */
- int
- sys_unmount(p, v, retval)
- struct proc *p;
- void *v;
- register_t *retval;
- {
- register struct sys_unmount_args /* {
- syscallarg(char *) path;
- syscallarg(int) flags;
- } */ *uap = v;
- register struct vnode *vp;
- struct mount *mp;
- int error;
- struct nameidata nd;
- NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE,
- SCARG(uap, path), p);
- if ((error = namei(&nd)) != 0)
- return (error);
- vp = nd.ni_vp;
- mp = vp->v_mount;
- /*
- * Only root, or the user that did the original mount is
- * permitted to unmount this filesystem.
- */
- if ((mp->mnt_stat.f_owner != p->p_ucred->cr_uid) &&
- (error = suser(p->p_ucred, &p->p_acflag))) {
- vput(vp);
- return (error);
- }
- /*
- * Don't allow unmounting the root file system.
- */
- if (mp->mnt_flag & MNT_ROOTFS) {
- vput(vp);
- return (EINVAL);
- }
- /*
- * Must be the root of the filesystem
- */
- if ((vp->v_flag & VROOT) == 0) {
- vput(vp);
- return (EINVAL);
- }
- vput(vp);
- return (dounmount(mp, SCARG(uap, flags), p));
- }
- /*
- * Do the actual file system unmount.
- */
- int
- dounmount(mp, flags, p)
- register struct mount *mp;
- int flags;
- struct proc *p;
- {
- struct vnode *coveredvp;
- int error;
- coveredvp = mp->mnt_vnodecovered;
- if (vfs_busy(mp))
- return (EBUSY);
- mp->mnt_flag |= MNT_UNMOUNT;
- if ((error = vfs_lock(mp)) != 0)
- return (error);
- mp->mnt_flag &=~ MNT_ASYNC;
- vnode_pager_umount(mp); /* release cached vnodes */
- cache_purgevfs(mp); /* remove cache entries for this file sys */
- if ((error = VFS_SYNC(mp, MNT_WAIT, p->p_ucred, p)) == 0 ||
- (flags & MNT_FORCE))
- error = VFS_UNMOUNT(mp, flags, p);
- mp->mnt_flag &= ~MNT_UNMOUNT;
- vfs_unbusy(mp);
- if (error) {
- vfs_unlock(mp);
- } else {
- CIRCLEQ_REMOVE(&mountlist, mp, mnt_list);
- if (coveredvp != NULLVP) {
- vrele(coveredvp);
- coveredvp->v_mountedhere = (struct mount *)0;
- }
- mp->mnt_op->vfs_refcount--;
- vfs_unlock(mp);
- if (mp->mnt_vnodelist.lh_first != NULL)
- panic("unmount: dangling vnode");
- free((caddr_t)mp, M_MOUNT);
- }
- return (error);
- }
- /*
- * Sync each mounted filesystem.
- */
- #ifdef DEBUG
- int syncprt = 0;
- struct ctldebug debug0 = { "syncprt", &syncprt };
- #endif
- /* ARGSUSED */
- int
- sys_sync(p, v, retval)
- struct proc *p;
- void *v;
- register_t *retval;
- {
- register struct mount *mp, *nmp;
- int asyncflag;
- for (mp = mountlist.cqh_first; mp != (void *)&mountlist; mp = nmp) {
- /*
- * Get the next pointer in case we hang on vfs_busy
- * while we are being unmounted.
- */
- nmp = mp->mnt_list.cqe_next;
- /*
- * The lock check below is to avoid races with mount
- * and unmount.
- */
- if ((mp->mnt_flag & (MNT_MLOCK|MNT_RDONLY|MNT_MPBUSY)) == 0 &&
- !vfs_busy(mp)) {
- asyncflag = mp->mnt_flag & MNT_ASYNC;
- mp->mnt_flag &= ~MNT_ASYNC;
- VFS_SYNC(mp, MNT_NOWAIT, p->p_ucred, p);
- if (asyncflag)
- mp->mnt_flag |= MNT_ASYNC;
- /*
- * Get the next pointer again, as the next filesystem
- * might have been unmounted while we were sync'ing.
- */
- nmp = mp->mnt_list.cqe_next;
- vfs_unbusy(mp);
- }
- }
- #ifdef DEBUG
- if (syncprt)
- vfs_bufstats();
- #endif /* DEBUG */
- return (0);
- }
- /*
- * Change filesystem quotas.
- */
- /* ARGSUSED */
- int
- sys_quotactl(p, v, retval)
- struct proc *p;
- void *v;
- register_t *retval;
- {
- register struct sys_quotactl_args /* {
- syscallarg(char *) path;
- syscallarg(int) cmd;
- syscallarg(int) uid;
- syscallarg(caddr_t) arg;
- } */ *uap = v;
- register struct mount *mp;
- int error;
- struct nameidata nd;
- NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p);
- if ((error = namei(&nd)) != 0)
- return (error);
- mp = nd.ni_vp->v_mount;
- vrele(nd.ni_vp);
- return (VFS_QUOTACTL(mp, SCARG(uap, cmd), SCARG(uap, uid),
- SCARG(uap, arg), p));
- }
- /*
- * Get filesystem statistics.
- */
- /* ARGSUSED */
- int
- sys_statfs(p, v, retval)
- struct proc *p;
- void *v;
- register_t *retval;
- {
- register struct sys_statfs_args /* {
- syscallarg(char *) path;
- syscallarg(struct statfs *) buf;
- } */ *uap = v;
- register struct mount *mp;
- register struct statfs *sp;
- int error;
- struct nameidata nd;
- NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p);
- if ((error = namei(&nd)) != 0)
- return (error);
- mp = nd.ni_vp->v_mount;
- sp = &mp->mnt_stat;
- vrele(nd.ni_vp);
- if ((error = VFS_STATFS(mp, sp, p)) != 0)
- return (error);
- sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK;
- return (copyout((caddr_t)sp, (caddr_t)SCARG(uap, buf), sizeof(*sp)));
- }
- /*
- * Get filesystem statistics.
- */
- /* ARGSUSED */
- int
- sys_fstatfs(p, v, retval)
- struct proc *p;
- void *v;
- register_t *retval;
- {
- register struct sys_fstatfs_args /* {
- syscallarg(int) fd;
- syscallarg(struct statfs *) buf;
- } */ *uap = v;
- struct file *fp;
- struct mount *mp;
- register struct statfs *sp;
- int error;
- if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0)
- return (error);
- mp = ((struct vnode *)fp->f_data)->v_mount;
- sp = &mp->mnt_stat;
- if ((error = VFS_STATFS(mp, sp, p)) != 0)
- return (error);
- sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK;
- return (copyout((caddr_t)sp, (caddr_t)SCARG(uap, buf), sizeof(*sp)));
- }
- /*
- * Get statistics on all filesystems.
- */
- int
- sys_getfsstat(p, v, retval)
- struct proc *p;
- void *v;
- register_t *retval;
- {
- register struct sys_getfsstat_args /* {
- syscallarg(struct statfs *) buf;
- syscallarg(long) bufsize;
- syscallarg(int) flags;
- } */ *uap = v;
- register struct mount *mp, *nmp;
- register struct statfs *sp;
- caddr_t sfsp;
- long count, maxcount, error;
- maxcount = SCARG(uap, bufsize) / sizeof(struct statfs);
- sfsp = (caddr_t)SCARG(uap, buf);
- for (count = 0,
- mp = mountlist.cqh_first; mp != (void *)&mountlist; mp = nmp) {
- nmp = mp->mnt_list.cqe_next;
- if (sfsp && count < maxcount &&
- ((mp->mnt_flag & MNT_MLOCK) == 0)) {
- sp = &mp->mnt_stat;
- /*
- * If MNT_NOWAIT is specified, do not refresh the
- * fsstat cache. MNT_WAIT overrides MNT_NOWAIT.
- */
- if (((SCARG(uap, flags) & MNT_NOWAIT) == 0 ||
- (SCARG(uap, flags) & MNT_WAIT)) &&
- (error = VFS_STATFS(mp, sp, p)))
- continue;
- sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK;
- error = copyout((caddr_t)sp, sfsp, sizeof(*sp));
- if (error)
- return (error);
- sfsp += sizeof(*sp);
- }
- count++;
- }
- if (sfsp && count > maxcount)
- *retval = maxcount;
- else
- *retval = count;
- return (0);
- }
- /*
- * Change current working directory to a given file descriptor.
- */
- /* ARGSUSED */
- int
- sys_fchdir(p, v, retval)
- struct proc *p;
- void *v;
- register_t *retval;
- {
- struct sys_fchdir_args /* {
- syscallarg(int) fd;
- } */ *uap = v;
- register struct filedesc *fdp = p->p_fd;
- struct vnode *vp, *tdp;
- struct mount *mp;
- struct file *fp;
- int error;
- if ((error = getvnode(fdp, SCARG(uap, fd), &fp)) != 0)
- return (error);
- vp = (struct vnode *)fp->f_data;
- VREF(vp);
- VOP_LOCK(vp);
- if (vp->v_type != VDIR)
- error = ENOTDIR;
- else
- error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p);
- while (!error && (mp = vp->v_mountedhere) != NULL) {
- if (mp->mnt_flag & MNT_MLOCK) {
- mp->mnt_flag |= MNT_MWAIT;
- sleep((caddr_t)mp, PVFS);
- continue;
- }
- if ((error = VFS_ROOT(mp, &tdp)) != 0)
- break;
- vput(vp);
- vp = tdp;
- }
- VOP_UNLOCK(vp);
- if (error) {
- vrele(vp);
- return (error);
- }
- vrele(fdp->fd_cdir);
- fdp->fd_cdir = vp;
- return (0);
- }
- /*
- * Change current working directory (``.'').
- */
- /* ARGSUSED */
- int
- sys_chdir(p, v, retval)
- struct proc *p;
- void *v;
- register_t *retval;
- {
- struct sys_chdir_args /* {
- syscallarg(char *) path;
- } */ *uap = v;
- register struct filedesc *fdp = p->p_fd;
- int error;
- struct nameidata nd;
- NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE,
- SCARG(uap, path), p);
- if ((error = change_dir(&nd, p)) != 0)
- return (error);
- vrele(fdp->fd_cdir);
- fdp->fd_cdir = nd.ni_vp;
- return (0);
- }
- /*
- * Change notion of root (``/'') directory.
- */
- /* ARGSUSED */
- int
- sys_chroot(p, v, retval)
- struct proc *p;
- void *v;
- register_t *retval;
- {
- struct sys_chroot_args /* {
- syscallarg(char *) path;
- } */ *uap = v;
- register struct filedesc *fdp = p->p_fd;
- int error;
- struct nameidata nd;
- if ((error = suser(p->p_ucred, &p->p_acflag)) != 0)
- return (error);
- NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE,
- SCARG(uap, path), p);
- if ((error = change_dir(&nd, p)) != 0)
- return (error);
- if (fdp->fd_rdir != NULL)
- vrele(fdp->fd_rdir);
- fdp->fd_rdir = nd.ni_vp;
- return (0);
- }
- /*
- * Common routine for chroot and chdir.
- */
- static int
- change_dir(ndp, p)
- register struct nameidata *ndp;
- struct proc *p;
- {
- struct vnode *vp;
- int error;
- if ((error = namei(ndp)) != 0)
- return (error);
- vp = ndp->ni_vp;
- if (vp->v_type != VDIR)
- error = ENOTDIR;
- else
- error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p);
- VOP_UNLOCK(vp);
- if (error)
- vrele(vp);
- return (error);
- }
- /*
- * Check permissions, allocate an open file structure,
- * and call the device open routine if any.
- */
- int
- sys_open(p, v, retval)
- struct proc *p;
- void *v;
- register_t *retval;
- {
- register struct sys_open_args /* {
- syscallarg(char *) path;
- syscallarg(int) flags;
- syscallarg(int) mode;
- } */ *uap = v;
- register struct filedesc *fdp = p->p_fd;
- register struct file *fp;
- register struct vnode *vp;
- int flags, cmode;
- struct file *nfp;
- int type, indx, error;
- struct flock lf;
- struct nameidata nd;
- extern struct fileops vnops;
- if ((error = falloc(p, &nfp, &indx)) != 0)
- return (error);
- fp = nfp;
- flags = FFLAGS(SCARG(uap, flags));
- cmode = ((SCARG(uap, mode) &~ fdp->fd_cmask) & ALLPERMS) &~ S_ISTXT;
- NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p);
- p->p_dupfd = -indx - 1; /* XXX check for fdopen */
- if ((error = vn_open(&nd, flags, cmode)) != 0) {
- ffree(fp);
- if ((error == ENODEV || error == ENXIO) &&
- p->p_dupfd >= 0 && /* XXX from fdopen */
- (error =
- dupfdopen(fdp, indx, p->p_dupfd, flags, error)) == 0) {
- *retval = indx;
- return (0);
- }
- if (error == ERESTART)
- error = EINTR;
- fdp->fd_ofiles[indx] = NULL;
- return (error);
- }
- p->p_dupfd = 0;
- vp = nd.ni_vp;
- fp->f_flag = flags & FMASK;
- fp->f_type = DTYPE_VNODE;
- fp->f_ops = &vnops;
- fp->f_data = (caddr_t)vp;
- if (flags & (O_EXLOCK | O_SHLOCK)) {
- lf.l_whence = SEEK_SET;
- lf.l_start = 0;
- lf.l_len = 0;
- if (flags & O_EXLOCK)
- lf.l_type = F_WRLCK;
- else
- lf.l_type = F_RDLCK;
- type = F_FLOCK;
- if ((flags & FNONBLOCK) == 0)
- type |= F_WAIT;
- VOP_UNLOCK(vp);
- error = VOP_ADVLOCK(vp, (caddr_t)fp, F_SETLK, &lf, type);
- if (error) {
- (void) vn_close(vp, fp->f_flag, fp->f_cred, p);
- ffree(fp);
- fdp->fd_ofiles[indx] = NULL;
- return (error);
- }
- VOP_LOCK(vp);
- fp->f_flag |= FHASLOCK;
- }
- VOP_UNLOCK(vp);
- *retval = indx;
- return (0);
- }
- /*
- * Create a special file.
- */
- /* ARGSUSED */
- int
- sys_mknod(p, v, retval)
- struct proc *p;
- void *v;
- register_t *retval;
- {
- register struct sys_mknod_args /* {
- syscallarg(char *) path;
- syscallarg(int) mode;
- syscallarg(int) dev;
- } */ *uap = v;
- register struct vnode *vp;
- struct vattr vattr;
- int error;
- int whiteout = 0;
- struct nameidata nd;
- if ((error = suser(p->p_ucred, &p->p_acflag)) != 0)
- return (error);
- NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p);
- if ((error = namei(&nd)) != 0)
- return (error);
- vp = nd.ni_vp;
- if (vp != NULL)
- error = EEXIST;
- else {
- VATTR_NULL(&vattr);
- vattr.va_mode = (SCARG(uap, mode) & ALLPERMS) &~ p->p_fd->fd_cmask;
- vattr.va_rdev = SCARG(uap, dev);
- whiteout = 0;
- switch (SCARG(uap, mode) & S_IFMT) {
- case S_IFMT: /* used by badsect to flag bad sectors */
- vattr.va_type = VBAD;
- break;
- case S_IFCHR:
- vattr.va_type = VCHR;
- break;
- case S_IFBLK:
- vattr.va_type = VBLK;
- break;
- case S_IFWHT:
- whiteout = 1;
- break;
- default:
- error = EINVAL;
- break;
- }
- }
- if (!error) {
- VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE);
- if (whiteout) {
- error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, CREATE);
- if (error)
- VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd);
- vput(nd.ni_dvp);
- } else {
- error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp,
- &nd.ni_cnd, &vattr);
- }
- } else {
- VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd);
- if (nd.ni_dvp == vp)
- vrele(nd.ni_dvp);
- else
- vput(nd.ni_dvp);
- if (vp)
- vrele(vp);
- }
- return (error);
- }
- /*
- * Create a named pipe.
- */
- /* ARGSUSED */
- int
- sys_mkfifo(p, v, retval)
- struct proc *p;
- void *v;
- register_t *retval;
- {
- #ifndef FIFO
- return (EOPNOTSUPP);
- #else
- register struct sys_mkfifo_args /* {
- syscallarg(char *) path;
- syscallarg(int) mode;
- } */ *uap = v;
- struct vattr vattr;
- int error;
- struct nameidata nd;
- NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p);
- if ((error = namei(&nd)) != 0)
- return (error);
- if (nd.ni_vp != NULL) {
- VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd);
- if (nd.ni_dvp == nd.ni_vp)
- vrele(nd.ni_dvp);
- else
- vput(nd.ni_dvp);
- vrele(nd.ni_vp);
- return (EEXIST);
- }
- VATTR_NULL(&vattr);
- vattr.va_type = VFIFO;
- vattr.va_mode = (SCARG(uap, mode) & ALLPERMS) &~ p->p_fd->fd_cmask;
- VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE);
- return (VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr));
- #endif /* FIFO */
- }
- /*
- * Make a hard file link.
- */
- /* ARGSUSED */
- int
- sys_link(p, v, retval)
- struct proc *p;
- void *v;
- register_t *retval;
- {
- register struct sys_link_args /* {
- syscallarg(char *) path;
- syscallarg(char *) link;
- } */ *uap = v;
- register struct vnode *vp;
- struct nameidata nd;
- int error;
- NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p);
- if ((error = namei(&nd)) != 0)
- return (error);
- vp = nd.ni_vp;
- NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, link), p);
- if ((error = namei(&nd)) != 0)
- goto out;
- if (nd.ni_vp) {
- VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd);
- if (nd.ni_dvp == nd.ni_vp)
- vrele(nd.ni_dvp);
- else
- vput(nd.ni_dvp);
- vrele(nd.ni_vp);
- error = EEXIST;
- goto out;
- }
- VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE);
- VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE);
- error = VOP_LINK(nd.ni_dvp, vp, &nd.ni_cnd);
- out:
- vrele(vp);
- return (error);
- }
- /*
- * Make a symbolic link.
- */
- /* ARGSUSED */
- int
- sys_symlink(p, v, retval)
- struct proc *p;
- void *v;
- register_t *retval;
- {
- register struct sys_symlink_args /* {
- syscallarg(char *) path;
- syscallarg(char *) link;
- } */ *uap = v;
- struct vattr vattr;
- char *path;
- int error;
- struct nameidata nd;
- MALLOC(path, char *, MAXPATHLEN, M_NAMEI, M_WAITOK);
- error = copyinstr(SCARG(uap, path), path, MAXPATHLEN, NULL);
- if (error)
- goto out;
- NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, link), p);
- if ((error = namei(&nd)) != 0)
- goto out;
- if (nd.ni_vp) {
- VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd);
- if (nd.ni_dvp == nd.ni_vp)
- vrele(nd.ni_dvp);
- else
- vput(nd.ni_dvp);
- vrele(nd.ni_vp);
- error = EEXIST;
- goto out;
- }
- VATTR_NULL(&vattr);
- vattr.va_mode = ACCESSPERMS &~ p->p_fd->fd_cmask;
- VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE);
- error = VOP_SYMLINK(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr, path);
- out:
- FREE(path, M_NAMEI);
- return (error);
- }
- /*
- * Delete a whiteout from the filesystem.
- */
- /* ARGSUSED */
- int
- sys_undelete(p, v, retval)
- struct proc *p;
- void *v;
- register_t *retval;
- {
- register struct sys_undelete_args /* {
- syscallarg(char *) path;
- } */ *uap = v;
- int error;
- struct nameidata nd;
- NDINIT(&nd, DELETE, LOCKPARENT|DOWHITEOUT, UIO_USERSPACE,
- SCARG(uap, path), p);
- error = namei(&nd);
- if (error)
- return (error);
- if (nd.ni_vp != NULLVP || !(nd.ni_cnd.cn_flags & ISWHITEOUT)) {
- VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd);
- if (nd.ni_dvp == nd.ni_vp)
- vrele(nd.ni_dvp);
- else
- vput(nd.ni_dvp);
- if (nd.ni_vp)
- vrele(nd.ni_vp);
- return (EEXIST);
- }
- VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE);
- if ((error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, DELETE)) != 0)
- VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd);
- vput(nd.ni_dvp);
- return (error);
- }
- /*
- * Delete a name from the filesystem.
- */
- /* ARGSUSED */
- int
- sys_unlink(p, v, retval)
- struct proc *p;
- void *v;
- register_t *retval;
- {
- struct sys_unlink_args /* {
- syscallarg(char *) path;
- } */ *uap = v;
- register struct vnode *vp;
- int error;
- struct nameidata nd;
- NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF, UIO_USERSPACE,
- SCARG(uap, path), p);
- if ((error = namei(&nd)) != 0)
- return (error);
- vp = nd.ni_vp;
- /*
- * The root of a mounted filesystem cannot be deleted.
- */
- if (vp->v_flag & VROOT) {
- VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd);
- if (nd.ni_dvp == vp)
- vrele(nd.ni_dvp);
- else
- vput(nd.ni_dvp);
- vput(vp);
- error = EBUSY;
- goto out;
- }
- (void)vnode_pager_uncache(vp);
- VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE);
- VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE);
- error = VOP_REMOVE(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd);
- out:
- return (error);
- }
- /*
- * Reposition read/write file offset.
- */
- int
- sys_lseek(p, v, retval)
- struct proc *p;
- void *v;
- register_t *retval;
- {
- register struct sys_lseek_args /* {
- syscallarg(int) fd;
- syscallarg(int) pad;
- syscallarg(off_t) offset;
- syscallarg(int) whence;
- } */ *uap = v;
- struct ucred *cred = p->p_ucred;
- register struct filedesc *fdp = p->p_fd;
- register struct file *fp;
- struct vattr vattr;
- int error;
- if ((u_int)SCARG(uap, fd) >= fdp->fd_nfiles ||
- (fp = fdp->fd_ofiles[SCARG(uap, fd)]) == NULL)
- return (EBADF);
- if (fp->f_type != DTYPE_VNODE)
- return (ESPIPE);
- switch (SCARG(uap, whence)) {
- case L_INCR:
- fp->f_offset += SCARG(uap, offset);
- break;
- case L_XTND:
- error = VOP_GETATTR((struct vnode *)fp->f_data, &vattr,
- cred, p);
- if (error)
- return (error);
- fp->f_offset = SCARG(uap, offset) + vattr.va_size;
- break;
- case L_SET:
- fp->f_offset = SCARG(uap, offset);
- break;
- default:
- return (EINVAL);
- }
- *(off_t *)retval = fp->f_offset;
- return (0);
- }
- /*
- * Check access permissions.
- */
- int
- sys_access(p, v, retval)
- struct proc *p;
- void *v;
- register_t *retval;
- {
- register struct sys_access_args /* {
- syscallarg(char *) path;
- syscallarg(int) flags;
- } */ *uap = v;
- register struct ucred *cred = p->p_ucred;
- register struct vnode *vp;
- int error, flags, t_gid, t_uid;
- struct nameidata nd;
- t_uid = cred->cr_uid;
- t_gid = cred->cr_gid;
- cred->cr_uid = p->p_cred->p_ruid;
- cred->cr_gid = p->p_cred->p_rgid;
- NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE,
- SCARG(uap, path), p);
- if ((error = namei(&nd)) != 0)
- goto out1;
- vp = nd.ni_vp;
- /* Flags == 0 means only check for existence. */
- if (SCARG(uap, flags)) {
- flags = 0;
- if (SCARG(uap, flags) & R_OK)
- flags |= VREAD;
- if (SCARG(uap, flags) & W_OK)
- flags |= VWRITE;
- if (SCARG(uap, flags) & X_OK)
- flags |= VEXEC;
- if ((flags & VWRITE) == 0 || (error = vn_writechk(vp)) == 0)
- error = VOP_ACCESS(vp, flags, cred, p);
- }
- vput(vp);
- out1:
- cred->cr_uid = t_uid;
- cred->cr_gid = t_gid;
- return (error);
- }
- /*
- * Get file status; this version follows links.
- */
- /* ARGSUSED */
- int
- sys_stat(p, v, retval)
- struct proc *p;
- void *v;
- register_t *retval;
- {
- register struct sys_stat_args /* {
- syscallarg(char *) path;
- syscallarg(struct stat *) ub;
- } */ *uap = v;
- struct stat sb;
- int error;
- struct nameidata nd;
- NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE,
- SCARG(uap, path), p);
- if ((error = namei(&nd)) != 0)
- return (error);
- error = vn_stat(nd.ni_vp, &sb, p);
- vput(nd.ni_vp);
- if (error)
- return (error);
- error = copyout((caddr_t)&sb, (caddr_t)SCARG(uap, ub), sizeof (sb));
- return (error);
- }
- /*
- * Get file status; this version does not follow links.
- */
- /* ARGSUSED */
- int
- sys_lstat(p, v, retval)
- struct proc *p;
- void *v;
- register_t *retval;
- {
- register struct sys_lstat_args /* {
- syscallarg(char *) path;
- syscallarg(struct stat *) ub;
- } */ *uap = v;
- struct stat sb;
- int error;
- struct nameidata nd;
- NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF, UIO_USERSPACE,
- SCARG(uap, path), p);
- if ((error = namei(&nd)) != 0)
- return (error);
- error = vn_stat(nd.ni_vp, &sb, p);
- vput(nd.ni_vp);
- if (error)
- return (error);
- error = copyout((caddr_t)&sb, (caddr_t)SCARG(uap, ub), sizeof (sb));
- return (error);
- }
- /*
- * Get configurable pathname variables.
- */
- /* ARGSUSED */
- int
- sys_pathconf(p, v, retval)
- struct proc *p;
- void *v;
- register_t *retval;
- {
- register struct sys_pathconf_args /* {
- syscallarg(char *) path;
- syscallarg(int) name;
- } */ *uap = v;
- int error;
- struct nameidata nd;
- NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE,
- SCARG(uap, path), p);
- if ((error = namei(&nd)) != 0)
- return (error);
- error = VOP_PATHCONF(nd.ni_vp, SCARG(uap, name), retval);
- vput(nd.ni_vp);
- return (error);
- }
- /*
- * Return target name of a symbolic link.
- */
- /* ARGSUSED */
- int
- sys_readlink(p, v, retval)
- struct proc *p;
- void *v;
- register_t *retval;
- {
- register struct sys_readlink_args /* {
- syscallarg(char *) path;
- syscallarg(char *) buf;
- syscallarg(int) count;
- } */ *uap = v;
- register struct vnode *vp;
- struct iovec aiov;
- struct uio auio;
- int error;
- struct nameidata nd;
- NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF, UIO_USERSPACE,
- SCARG(uap, path), p);
- if ((error = namei(&nd)) != 0)
- return (error);
- vp = nd.ni_vp;
- if (vp->v_type != VLNK)
- error = EINVAL;
- else {
- aiov.iov_base = SCARG(uap, buf);
- aiov.iov_len = SCARG(uap, count);
- auio.uio_iov = &aiov;
- auio.uio_iovcnt = 1;
- auio.uio_offset = 0;
- auio.uio_rw = UIO_READ;
- auio.uio_segflg = UIO_USERSPACE;
- auio.uio_procp = p;
- auio.uio_resid = SCARG(uap, count);
- error = VOP_READLINK(vp, &auio, p->p_ucred);
- }
- vput(vp);
- *retval = SCARG(uap, count) - auio.uio_resid;
- return (error);
- }
- /*
- * Change flags of a file given a path name.
- */
- /* ARGSUSED */
- int
- sys_chflags(p, v, retval)
- struct proc *p;
- void *v;
- register_t *retval;
- {
- register struct sys_chflags_args /* {
- syscallarg(char *) path;
- syscallarg(int) flags;
- } */ *uap = v;
- register struct vnode *vp;
- struct vattr vattr;
- int error;
- struct nameidata nd;
- NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p);
- if ((error = namei(&nd)) != 0)
- return (error);
- vp = nd.ni_vp;
- VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE);
- VOP_LOCK(vp);
- if (vp->v_mount->mnt_flag & MNT_RDONLY)
- error = EROFS;
- else {
- VATTR_NULL(&vattr);
- vattr.va_flags = SCARG(uap, flags);
- error = VOP_SETATTR(vp, &vattr, p->p_ucred, p);
- }
- vput(vp);
- return (error);
- }
- /*
- * Change flags of a file given a file descriptor.
- */
- /* ARGSUSED */
- int
- sys_fchflags(p, v, retval)
- struct proc *p;
- void *v;
- register_t *retval;
- {
- register struct sys_fchflags_args /* {
- syscallarg(int) fd;
- syscallarg(int) flags;
- } */ *uap = v;
- struct vattr vattr;
- struct vnode *vp;
- struct file *fp;
- int error;
- if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0)
- return (error);
- vp = (struct vnode *)fp->f_data;
- VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE);
- VOP_LOCK(vp);
- if (vp->v_mount->mnt_flag & MNT_RDONLY)
- error = EROFS;
- else {
- VATTR_NULL(&vattr);
- vattr.va_flags = SCARG(uap, flags);
- error = VOP_SETATTR(vp, &vattr, p->p_ucred, p);
- }
- VOP_UNLOCK(vp);
- return (error);
- }
- /*
- * Change mode of a file given path name.
- */
- /* ARGSUSED */
- int
- sys_chmod(p, v, retval)
- struct proc *p;
- void *v;
- register_t *retval;
- {
- register struct sys_chmod_args /* {
- syscallarg(char *) path;
- syscallarg(int) mode;
- } */ *uap = v;
- register struct vnode *vp;
- struct vattr vattr;
- int error;
- struct nameidata nd;
- NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p);
- if ((error = namei(&nd)) != 0)
- return (error);
- vp = nd.ni_vp;
- VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE);
- VOP_LOCK(vp);
- if (vp->v_mount->mnt_flag & MNT_RDONLY)
- error = EROFS;
- else {
- VATTR_NULL(&vattr);
- vattr.va_mode = SCARG(uap, mode) & ALLPERMS;
- error = VOP_SETATTR(vp, &vattr, p->p_ucred, p);
- }
- vput(vp);
- return (error);
- }
- /*
- * Change mode of a file given a file descriptor.
- */
- /* ARGSUSED */
- int
- sys_fchmod(p, v, retval)
- struct proc *p;
- void *v;
- register_t *retval;
- {
- register struct sys_fchmod_args /* {
- syscallarg(int) fd;
- syscallarg(int) mode;
- } */ *uap = v;
- struct vattr vattr;
- struct vnode *vp;
- struct file *fp;
- int error;
- if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0)
- return (error);
- vp = (struct vnode *)fp->f_data;
- VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE);
- VOP_LOCK(vp);
- if (vp->v_mount->mnt_flag & MNT_RDONLY)
- error = EROFS;
- else {
- VATTR_NULL(&vattr);
- vattr.va_mode = SCARG(uap, mode) & ALLPERMS;
- error = VOP_SETATTR(vp, &vattr, p->p_ucred, p);
- }
- VOP_UNLOCK(vp);
- return (error);
- }
- /*
- * Set ownership given a path name.
- */
- /* ARGSUSED */
- int
- sys_chown(p, v, retval)
- struct proc *p;
- void *v;
- register_t *retval;
- {
- register struct sys_chown_args /* {
- syscallarg(char *) path;
- syscallarg(int) uid;
- syscallarg(int) gid;
- } */ *uap = v;
- register struct vnode *vp;
- struct vattr vattr;
- int error;
- struct nameidata nd;
- NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p);
- if ((error = namei(&nd)) != 0)
- return (error);
- vp = nd.ni_vp;
- VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE);
- VOP_LOCK(vp);
- if (vp->v_mount->mnt_flag & MNT_RDONLY)
- error = EROFS;
- else {
- VATTR_NULL(&vattr);
- vattr.va_uid = SCARG(uap, uid);
- vattr.va_gid = SCARG(uap, gid);
- error = VOP_SETATTR(vp, &vattr, p->p_ucred, p);
- }
- vput(vp);
- return (error);
- }
- /*
- * Set ownership given a file descriptor.
- */
- /* ARGSUSED */
- int
- sys_fchown(p, v, retval)
- struct proc *p;
- void *v;
- register_t *retval;
- {
- register struct sys_fchown_args /* {
- syscallarg(int) fd;
- syscallarg(int) uid;
- syscallarg(int) gid;
- } */ *uap = v;
- register struct vnode *vp;
- struct vattr vattr;
- int error;
- struct file *fp;
- if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0)
- return (error);
- vp = (struct vnode *)fp->f_data;
- VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE);
- VOP_LOCK(vp);
- if (vp->v_mount->mnt_flag & MNT_RDONLY)
- error = EROFS;
- else {
- VATTR_NULL(&vattr);
- vattr.va_uid = SCARG(uap, uid);
- vattr.va_gid = SCARG(uap, gid);
- error = VOP_SETATTR(vp, &vattr, p->p_ucred, p);
- }
- VOP_UNLOCK(vp);
- return (error);
- }
- /*
- * Set the access and modification times given a path name.
- */
- /* ARGSUSED */
- int
- sys_utimes(p, v, retval)
- struct proc *p;
- void *v;
- register_t *retval;
- {
- register struct sys_utimes_args /* {
- syscallarg(char *) path;
- syscallarg(struct timeval *) tptr;
- } */ *uap = v;
- register struct vnode *vp;
- struct timeval tv[2];
- struct vattr vattr;
- int error;
- struct nameidata nd;
- VATTR_NULL(&vattr);
- if (SCARG(uap, tptr) == NULL) {
- microtime(&tv[0]);
- tv[1] = tv[0];
- vattr.va_vaflags |= VA_UTIMES_NULL;
- } else {
- error = copyin((caddr_t)SCARG(uap, tptr), (caddr_t)tv,
- sizeof (tv));
- if (error)
- return (error);
- }
- NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p);
- if ((error = namei(&nd)) != 0)
- return (error);
- vp = nd.ni_vp;
- VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE);
- VOP_LOCK(vp);
- if (vp->v_mount->mnt_flag & MNT_RDONLY)
- error = EROFS;
- else {
- vattr.va_atime.tv_sec = tv[0].tv_sec;
- vattr.va_atime.tv_nsec = tv[0].tv_usec * 1000;
- vattr.va_mtime.tv_sec = tv[1].tv_sec;
- vattr.va_mtime.tv_nsec = tv[1].tv_usec * 1000;
- error = VOP_SETATTR(vp, &vattr, p->p_ucred, p);
- }
- vput(vp);
- return (error);
- }
- /*
- * Set the access and modification times given a file descriptor.
- */
- /* ARGSUSED */
- int
- sys_futimes(p, v, retval)
- struct proc *p;
- void *v;
- register_t *retval;
- {
- register struct sys_futimes_args /* {
- syscallarg(int) fd;
- syscallarg(struct timeval *) tptr;
- } */ *uap = v;
- register struct vnode *vp;
- struct timeval tv[2];
- struct vattr vattr;
- int error;
- struct file *fp;
- VATTR_NULL(&vattr);
- if (SCARG(uap, tptr) == NULL) {
- microtime(&tv[0]);
- tv[1] = tv[0];
- vattr.va_vaflags |= VA_UTIMES_NULL;
- } else {
- error = copyin((caddr_t)SCARG(uap, tptr), (caddr_t)tv,
- sizeof (tv));
- if (error)
- return (error);
- }
- if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0)
- return (error);
- vp = (struct vnode *)fp->f_data;
- VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE);
- VOP_LOCK(vp);
- if (vp->v_mount->mnt_flag & MNT_RDONLY)
- error = EROFS;
- else {
- vattr.va_atime.tv_sec = tv[0].tv_sec;
- vattr.va_atime.tv_nsec = tv[0].tv_usec * 1000;
- vattr.va_mtime.tv_sec = tv[1].tv_sec;
- vattr.va_mtime.tv_nsec = tv[1].tv_usec * 1000;
- error = VOP_SETATTR(vp, &vattr, p->p_ucred, p);
- }
- VOP_UNLOCK(vp);
- return (error);
- }
- /*
- * Truncate a file given its path name.
- */
- /* ARGSUSED */
- int
- sys_truncate(p, v, retval)
- struct proc *p;
- void *v;
- register_t *retval;
- {
- register struct sys_truncate_args /* {
- syscallarg(char *) path;
- syscallarg(int) pad;
- syscallarg(off_t) length;
- } */ *uap = v;
- register struct vnode *vp;
- struct vattr vattr;
- int error;
- struct nameidata nd;
- NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p);
- if ((error = namei(&nd)) != 0)
- return (error);
- vp = nd.ni_vp;
- VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE);
- VOP_LOCK(vp);
- if (vp->v_type == VDIR)
- error = EISDIR;
- else if ((error = vn_writechk(vp)) == 0 &&
- (error = VOP_ACCESS(vp, VWRITE, p->p_ucred, p)) == 0) {
- VATTR_NULL(&vattr);
- vattr.va_size = SCARG(uap, length);
- error = VOP_SETATTR(vp, &vattr, p->p_ucred, p);
- }
- vput(vp);
- return (error);
- }
- /*
- * Truncate a file given a file descriptor.
- */
- /* ARGSUSED */
- int
- sys_ftruncate(p, v, retval)
- struct proc *p;
- void *v;
- register_t *retval;
- {
- register struct sys_ftruncate_args /* {
- syscallarg(int) fd;
- syscallarg(int) pad;
- syscallarg(off_t) length;
- } */ *uap = v;
- struct vattr vattr;
- struct vnode *vp;
- struct file *fp;
- int error;
- if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0)
- return (error);
- if ((fp->f_flag & FWRITE) == 0)
- return (EINVAL);
- vp = (struct vnode *)fp->f_data;
- VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE);
- VOP_LOCK(vp);
- if (vp->v_type == VDIR)
- error = EISDIR;
- else if ((error = vn_writechk(vp)) == 0) {
- VATTR_NULL(&vattr);
- vattr.va_size = SCARG(uap, length);
- error = VOP_SETATTR(vp, &vattr, fp->f_cred, p);
- }
- VOP_UNLOCK(vp);
- return (error);
- }
- /*
- * Sync an open file.
- */
- /* ARGSUSED */
- int
- sys_fsync(p, v, retval)
- struct proc *p;
- void *v;
- register_t *retval;
- {
- struct sys_fsync_args /* {
- syscallarg(int) fd;
- } */ *uap = v;
- register struct vnode *vp;
- struct file *fp;
- int error;
- if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0)
- return (error);
- vp = (struct vnode *)fp->f_data;
- VOP_LOCK(vp);
- error = VOP_FSYNC(vp, fp->f_cred, MNT_WAIT, p);
- VOP_UNLOCK(vp);
- return (error);
- }
- /*
- * Rename files. Source and destination must either both be directories,
- * or both not be directories. If target is a directory, it must be empty.
- */
- /* ARGSUSED */
- int
- sys_rename(p, v, retval)
- struct proc *p;
- void *v;
- register_t *retval;
- {
- register struct sys_rename_args /* {
- syscallarg(char *) from;
- syscallarg(char *) to;
- } */ *uap = v;
- register struct vnode *tvp, *fvp, *tdvp;
- struct nameidata fromnd, tond;
- int error;
- NDINIT(&fromnd, DELETE, WANTPARENT | SAVESTART, UIO_USERSPACE,
- SCARG(uap, from), p);
- if ((error = namei(&fromnd)) != 0)
- return (error);
- fvp = fromnd.ni_vp;
- NDINIT(&tond, RENAME, LOCKPARENT | LOCKLEAF | NOCACHE | SAVESTART,
- UIO_USERSPACE, SCARG(uap, to), p);
- if ((error = namei(&tond)) != 0) {
- VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd);
- vrele(fromnd.ni_dvp);
- vrele(fvp);
- goto out1;
- }
- tdvp = tond.ni_dvp;
- tvp = tond.ni_vp;
- if (tvp != NULL) {
- if (fvp->v_type == VDIR && tvp->v_type != VDIR) {
- error = ENOTDIR;
- goto out;
- } else if (fvp->v_type != VDIR && tvp->v_type == VDIR) {
- error = EISDIR;
- goto out;
- }
- }
- if (fvp == tdvp)
- error = EINVAL;
- /*
- * If source is the same as the destination (that is the
- * same inode number with the same name in the same directory),
- * then there is nothing to do.
- */
- if (fvp == tvp && fromnd.ni_dvp == tdvp &&
- fromnd.ni_cnd.cn_namelen == tond.ni_cnd.cn_namelen &&
- !bcmp(fromnd.ni_cnd.cn_nameptr, tond.ni_cnd.cn_nameptr,
- fromnd.ni_cnd.cn_namelen))
- error = -1;
- out:
- if (!error) {
- VOP_LEASE(tdvp, p, p->p_ucred, LEASE_WRITE);
- if (fromnd.ni_dvp != tdvp)
- VOP_LEASE(fromnd.ni_dvp, p, p->p_ucred, LEASE_WRITE);
- if (tvp)
- VOP_LEASE(tvp, p, p->p_ucred, LEASE_WRITE);
- error = VOP_RENAME(fromnd.ni_dvp, fromnd.ni_vp, &fromnd.ni_cnd,
- tond.ni_dvp, tond.ni_vp, &tond.ni_cnd);
- } else {
- VOP_ABORTOP(tond.ni_dvp, &tond.ni_cnd);
- if (tdvp == tvp)
- vrele(tdvp);
- else
- vput(tdvp);
- if (tvp)
- vput(tvp);
- VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd);
- vrele(fromnd.ni_dvp);
- vrele(fvp);
- }
- vrele(tond.ni_startdir);
- FREE(tond.ni_cnd.cn_pnbuf, M_NAMEI);
- out1:
- if (fromnd.ni_startdir)
- vrele(fromnd.ni_startdir);
- FREE(fromnd.ni_cnd.cn_pnbuf, M_NAMEI);
- if (error == -1)
- return (0);
- return (error);
- }
- /*
- * Make a directory file.
- */
- /* ARGSUSED */
- int
- sys_mkdir(p, v, retval)
- struct proc *p;
- void *v;
- register_t *retval;
- {
- register struct sys_mkdir_args /* {
- syscallarg(char *) path;
- syscallarg(int) mode;
- } */ *uap = v;
- register struct vnode *vp;
- struct vattr vattr;
- int error;
- struct nameidata nd;
- NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p);
- if ((error = namei(&nd)) != 0)
- return (error);
- vp = nd.ni_vp;
- if (vp != NULL) {
- VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd);
- if (nd.ni_dvp == vp)
- vrele(nd.ni_dvp);
- else
- vput(nd.ni_dvp);
- vrele(vp);
- return (EEXIST);
- }
- VATTR_NULL(&vattr);
- vattr.va_type = VDIR;
- vattr.va_mode = (SCARG(uap, mode) & ACCESSPERMS) &~ p->p_fd->fd_cmask;
- VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE);
- error = VOP_MKDIR(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr);
- if (!error)
- vput(nd.ni_vp);
- return (error);
- }
- /*
- * Remove a directory file.
- */
- /* ARGSUSED */
- int
- sys_rmdir(p, v, retval)
- struct proc *p;
- void *v;
- register_t *retval;
- {
- struct sys_rmdir_args /* {
- syscallarg(char *) path;
- } */ *uap = v;
- register struct vnode *vp;
- int error;
- struct nameidata nd;
- NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF, UIO_USERSPACE,
- SCARG(uap, path), p);
- if ((error = namei(&nd)) != 0)
- return (error);
- vp = nd.ni_vp;
- if (vp->v_type != VDIR) {
- error = ENOTDIR;
- goto out;
- }
- /*
- * No rmdir "." please.
- */
- if (nd.ni_dvp == vp) {
- error = EINVAL;
- goto out;
- }
- /*
- * The root of a mounted filesystem cannot be deleted.
- */
- if (vp->v_flag & VROOT)
- error = EBUSY;
- out:
- if (!error) {
- VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE);
- VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE);
- error = VOP_RMDIR(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd);
- } else {
- VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd);
- if (nd.ni_dvp == vp)
- vrele(nd.ni_dvp);
- else
- vput(nd.ni_dvp);
- vput(vp);
- }
- return (error);
- }
- /*
- * Read a block of directory entries in a file system independent format.
- */
- int
- sys_getdirentries(p, v, retval)
- struct proc *p;
- void *v;
- register_t *retval;
- {
- register struct sys_getdirentries_args /* {
- syscallarg(int) fd;
- syscallarg(char *) buf;
- syscallarg(u_int) count;
- syscallarg(long *) basep;
- } */ *uap = v;
- register struct vnode *vp;
- struct file *fp;
- struct uio auio;
- struct iovec aiov;
- long loff;
- int error, eofflag;
- if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0)
- return (error);
- if ((fp->f_flag & FREAD) == 0)
- return (EBADF);
- vp = (struct vnode *)fp->f_data;
- unionread:
- if (vp->v_type != VDIR)
- return (EINVAL);
- aiov.iov_base = SCARG(uap, buf);
- aiov.iov_len = SCARG(uap, count);
- auio.uio_iov = &aiov;
- auio.uio_iovcnt = 1;
- auio.uio_rw = UIO_READ;
- auio.uio_segflg = UIO_USERSPACE;
- auio.uio_procp = p;
- auio.uio_resid = SCARG(uap, count);
- VOP_LOCK(vp);
- loff = auio.uio_offset = fp->f_offset;
- error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag, (u_long *)0, 0);
- fp->f_offset = auio.uio_offset;
- VOP_UNLOCK(vp);
- if (error)
- return (error);
- #ifdef UNION
- {
- extern int (**union_vnodeop_p) __P((void *));
- extern struct vnode *union_dircache __P((struct vnode *));
- if ((SCARG(uap, count) == auio.uio_resid) &&
- (vp->v_op == union_vnodeop_p)) {
- struct vnode *lvp;
- lvp = union_dircache(vp);
- if (lvp != NULLVP) {
- struct vattr va;
- /*
- * If the directory is opaque,
- * then don't show lower entries
- */
- error = VOP_GETATTR(vp, &va, fp->f_cred, p);
- if (va.va_flags & OPAQUE) {
- vput(lvp);
- lvp = NULL;
- }
- }
-
- if (lvp != NULLVP) {
- error = VOP_OPEN(lvp, FREAD, fp->f_cred, p);
- VOP_UNLOCK(lvp);
- if (error) {
- vrele(lvp);
- return (error);
- }
- fp->f_data = (caddr_t) lvp;
- fp->f_offset = 0;
- error = vn_close(vp, FREAD, fp->f_cred, p);
- if (error)
- return (error);
- vp = lvp;
- goto unionread;
- }
- }
- }
- #endif /* UNION */
- if ((SCARG(uap, count) == auio.uio_resid) &&
- (vp->v_flag & VROOT) &&
- (vp->v_mount->mnt_flag & MNT_UNION)) {
- struct vnode *tvp = vp;
- vp = vp->v_mount->mnt_vnodecovered;
- VREF(vp);
- fp->f_data = (caddr_t) vp;
- fp->f_offset = 0;
- vrele(tvp);
- goto unionread;
- }
- error = copyout((caddr_t)&loff, (caddr_t)SCARG(uap, basep),
- sizeof(long));
- *retval = SCARG(uap, count) - auio.uio_resid;
- return (error);
- }
- /*
- * Set the mode mask for creation of filesystem nodes.
- */
- int
- sys_umask(p, v, retval)
- struct proc *p;
- void *v;
- register_t *retval;
- {
- struct sys_umask_args /* {
- syscallarg(int) newmask;
- } */ *uap = v;
- register struct filedesc *fdp;
- fdp = p->p_fd;
- *retval = fdp->fd_cmask;
- fdp->fd_cmask = SCARG(uap, newmask) & ALLPERMS;
- return (0);
- }
- /*
- * Void all references to file by ripping underlying filesystem
- * away from vnode.
- */
- /* ARGSUSED */
- int
- sys_revoke(p, v, retval)
- struct proc *p;
- void *v;
- register_t *retval;
- {
- register struct sys_revoke_args /* {
- syscallarg(char *) path;
- } */ *uap = v;
- register struct vnode *vp;
- struct vattr vattr;
- int error;
- struct nameidata nd;
- NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p);
- if ((error = namei(&nd)) != 0)
- return (error);
- vp = nd.ni_vp;
- if (vp->v_type != VCHR && vp->v_type != VBLK) {
- error = EINVAL;
- goto out;
- }
- if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0)
- goto out;
- if (p->p_ucred->cr_uid != vattr.va_uid &&
- (error = suser(p->p_ucred, &p->p_acflag)))
- goto out;
- if (vp->v_usecount > 1 || (vp->v_flag & VALIASED))
- vgoneall(vp);
- out:
- vrele(vp);
- return (error);
- }
- /*
- * Convert a user file descriptor to a kernel file entry.
- */
- int
- getvnode(fdp, fd, fpp)
- struct filedesc *fdp;
- int fd;
- struct file **fpp;
- {
- struct vnode *vp;
- struct file *fp;
- if ((u_int)fd >= fdp->fd_nfiles ||
- (fp = fdp->fd_ofiles[fd]) == NULL)
- return (EBADF);
- if (fp->f_type != DTYPE_VNODE)
- return (EINVAL);
- vp = (struct vnode *)fp->f_data;
- if (vp->v_type == VBAD)
- return (EBADF);
- *fpp = fp;
- return (0);
- }