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NetBSD/sys/kern/vfs_syscalls.c

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/* $NetBSD: vfs_syscalls.c,v 1.112 1998/02/14 19:49:43 kleink 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 "opt_uvm.h"
#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>
#if defined(UVM)
#include <uvm/uvm_extern.h>
#endif
static int change_dir __P((struct nameidata *, struct proc *));
static int change_mode __P((struct vnode *, int, struct proc *p));
static int change_owner __P((struct vnode *, uid_t, gid_t, struct proc *,
int));
static int change_utimes __P((struct vnode *vp, const struct timeval *,
struct proc *p));
static int rename_files __P((const char *, const char *, struct proc *, int));
void checkdirs __P((struct vnode *));
int dounmount __P((struct mount *, int, struct proc *));
/*
* Virtual File System System Calls
*/
/*
* Mount a file system.
*/
#if defined(COMPAT_09) || defined(COMPAT_43)
/*
* This table is used to maintain compatibility with 4.3BSD
* and NetBSD 0.9 mount syscalls. Note, the order is important!
*/
static const char *mountcompatnames[] = {
NULL, /* 0 = MOUNT_NONE */
MOUNT_FFS, /* 1 */
MOUNT_NFS, /* 2 */
MOUNT_MFS, /* 3 */
MOUNT_MSDOS, /* 4 */
MOUNT_LFS, /* 5 */
NULL, /* 6 = MOUNT_LOFS */
MOUNT_FDESC, /* 7 */
MOUNT_PORTAL, /* 8 */
MOUNT_NULL, /* 9 */
MOUNT_UMAP, /* 10 */
MOUNT_KERNFS, /* 11 */
MOUNT_PROCFS, /* 12 */
MOUNT_AFS, /* 13 */
MOUNT_CD9660, /* 14 = MOUNT_ISOFS */
MOUNT_UNION, /* 15 */
MOUNT_ADOSFS, /* 16 */
MOUNT_EXT2FS, /* 17 */
};
static const int nmountcompatnames = sizeof(mountcompatnames) /
sizeof(mountcompatnames[0]);
#endif /* COMPAT_09 || COMPAT_43 */
/* ARGSUSED */
int
sys_mount(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
register struct sys_mount_args /* {
syscallarg(const char *) type;
syscallarg(const char *) path;
syscallarg(int) flags;
syscallarg(void *) data;
} */ *uap = v;
register struct vnode *vp;
register struct mount *mp;
int error, flag = 0;
char fstypename[MFSNAMELEN];
struct vattr va;
struct nameidata nd;
struct vfsops *vfs;
/*
* 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;
vfs = mp->mnt_op;
/*
* 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)) != 0) {
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)) != 0 ||
(va.va_uid != p->p_ucred->cr_uid &&
(error = suser(p->p_ucred, &p->p_acflag)) != 0)) {
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.
*/
u_long fsindex = (u_long)SCARG(uap, type);
if (fsindex >= nmountcompatnames ||
mountcompatnames[fsindex] == NULL) {
vput(vp);
return (ENODEV);
}
strncpy(fstypename, mountcompatnames[fsindex], 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
if ((vfs = vfs_getopsbyname(fstypename)) == NULL) {
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 = vfs;
if ((error = vfs_lock(mp)) != 0) {
free((caddr_t)mp, M_MOUNT);
vput(vp);
return (error);
}
/* Do this early in case we block later. */
vfs->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 | MNT_NOCOREDUMP |
MNT_NOATIME | MNT_SYMPERM);
mp->mnt_flag |= SCARG(uap, flags) & (MNT_NOSUID | MNT_NOEXEC |
MNT_NODEV | MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC |
MNT_NOCOREDUMP | MNT_NOATIME | MNT_SYMPERM);
/*
* 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;
vfs->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(const 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)) != 0) {
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);
if (vfs_busy(mp))
return (EBUSY);
return (dounmount(mp, SCARG(uap, flags), p));
}
/*
* Do the actual file system unmount. File system is assumed to have been
* marked busy by the caller.
*/
int
dounmount(mp, flags, p)
register struct mount *mp;
int flags;
struct proc *p;
{
struct vnode *coveredvp;
int error;
coveredvp = mp->mnt_vnodecovered;
mp->mnt_flag |= MNT_UNMOUNT;
if ((error = vfs_lock(mp)) != 0) {
vfs_unbusy(mp);
return (error);
}
if (mp->mnt_flag & MNT_EXPUBLIC)
vfs_setpublicfs(NULL, NULL, NULL);
mp->mnt_flag &=~ MNT_ASYNC;
#if !defined(UVM)
vnode_pager_umount(mp); /* release cached vnodes */
#endif
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_last; mp != (void *)&mountlist; mp = nmp) {
/*
* Get the prev pointer in case we hang on vfs_busy
* while we are being unmounted.
*/
nmp = mp->mnt_list.cqe_prev;
/*
* 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;
#if defined(UVM)
uvm_vnp_sync(mp);
#else
vnode_pager_sync(mp);
#endif
VFS_SYNC(mp, MNT_NOWAIT, p->p_ucred, p);
if (asyncflag)
mp->mnt_flag |= MNT_ASYNC;
/*
* Get the prev pointer again, as the prior filesystem
* might have been unmounted while we were sync'ing.
*/
nmp = mp->mnt_list.cqe_prev;
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(const 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(const 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(sp, 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(sp, 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)) != 0)
continue;
sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK;
error = copyout(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(const 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(const 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(const 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;
flags = FFLAGS(SCARG(uap, flags));
if ((flags & (FREAD | FWRITE)) == 0)
return (EINVAL);
if ((error = falloc(p, &nfp, &indx)) != 0)
return (error);
fp = nfp;
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(const 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(const 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(const char *) path;
syscallarg(const 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(const char *) path;
syscallarg(const 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(const 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(const 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;
}
#if defined(UVM)
(void)uvm_vnp_uncache(vp);
#else
(void)vnode_pager_uncache(vp);
#endif
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 vnode *vp;
struct vattr vattr;
register off_t newoff;
int error;
if ((u_int)SCARG(uap, fd) >= fdp->fd_nfiles ||
(fp = fdp->fd_ofiles[SCARG(uap, fd)]) == NULL)
return (EBADF);
vp = (struct vnode *)fp->f_data;
if (fp->f_type != DTYPE_VNODE
#ifdef FIFO
|| vp->v_type == VFIFO
#endif
)
return (ESPIPE);
switch (SCARG(uap, whence)) {
case SEEK_CUR:
newoff = fp->f_offset + SCARG(uap, offset);
break;
case SEEK_END:
error = VOP_GETATTR(vp, &vattr, cred, p);
if (error)
return (error);
newoff = SCARG(uap, offset) + vattr.va_size;
break;
case SEEK_SET:
newoff = SCARG(uap, offset);
break;
default:
return (EINVAL);
}
if ((error = VOP_SEEK(vp, fp->f_offset, newoff, cred)) != 0)
return (error);
*(off_t *)retval = fp->f_offset = newoff;
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(const 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___stat13(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
register struct sys___stat13_args /* {
syscallarg(const 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(&sb, SCARG(uap, ub), sizeof (sb));
return (error);
}
/*
* Get file status; this version does not follow links.
*/
/* ARGSUSED */
int
sys___lstat13(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
register struct sys___lstat13_args /* {
syscallarg(const 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(&sb, 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(const 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(const 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 if (!(vp->v_mount->mnt_flag & MNT_SYMPERM) ||
(error = VOP_ACCESS(vp, VREAD, p->p_ucred, p)) == 0) {
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(const char *) path;
syscallarg(u_long) 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(u_long) 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; this version follows links.
*/
/* ARGSUSED */
int
sys_chmod(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
register struct sys_chmod_args /* {
syscallarg(const char *) path;
syscallarg(int) mode;
} */ *uap = v;
int error;
struct nameidata nd;
NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p);
if ((error = namei(&nd)) != 0)
return (error);
error = change_mode(nd.ni_vp, SCARG(uap, mode), p);
vrele(nd.ni_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 file *fp;
int error;
if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0)
return (error);
return (change_mode((struct vnode *)fp->f_data, SCARG(uap, mode), p));
}
/*
* Change mode of a file given path name; this version does not follow links.
*/
/* ARGSUSED */
int
sys_lchmod(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
register struct sys_lchmod_args /* {
syscallarg(const char *) path;
syscallarg(int) mode;
} */ *uap = v;
int error;
struct nameidata nd;
NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p);
if ((error = namei(&nd)) != 0)
return (error);
error = change_mode(nd.ni_vp, SCARG(uap, mode), p);
vrele(nd.ni_vp);
return (error);
}
/*
* Common routine to set mode given a vnode.
*/
static int
change_mode(vp, mode, p)
struct vnode *vp;
int mode;
struct proc *p;
{
struct vattr vattr;
int error;
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 = mode & ALLPERMS;
error = VOP_SETATTR(vp, &vattr, p->p_ucred, p);
}
VOP_UNLOCK(vp);
return (error);
}
/*
* Set ownership given a path name; this version follows links.
*/
/* ARGSUSED */
int
sys_chown(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
register struct sys_chown_args /* {
syscallarg(const char *) path;
syscallarg(uid_t) uid;
syscallarg(gid_t) gid;
} */ *uap = v;
int error;
struct nameidata nd;
NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p);
if ((error = namei(&nd)) != 0)
return (error);
error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 0);
vrele(nd.ni_vp);
return (error);
}
/*
* Set ownership given a path name; this version follows links.
* Provides POSIX semantics.
*/
/* ARGSUSED */
int
sys___posix_chown(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
register struct sys_chown_args /* {
syscallarg(const char *) path;
syscallarg(uid_t) uid;
syscallarg(gid_t) gid;
} */ *uap = v;
int error;
struct nameidata nd;
NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p);
if ((error = namei(&nd)) != 0)
return (error);
error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 1);
vrele(nd.ni_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(uid_t) uid;
syscallarg(gid_t) gid;
} */ *uap = v;
int error;
struct file *fp;
if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0)
return (error);
return (change_owner((struct vnode *)fp->f_data, SCARG(uap, uid),
SCARG(uap, gid), p, 0));
}
/*
* Set ownership given a file descriptor, providing POSIX/XPG semantics.
*/
/* ARGSUSED */
int
sys___posix_fchown(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
register struct sys_fchown_args /* {
syscallarg(int) fd;
syscallarg(uid_t) uid;
syscallarg(gid_t) gid;
} */ *uap = v;
int error;
struct file *fp;
if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0)
return (error);
return (change_owner((struct vnode *)fp->f_data, SCARG(uap, uid),
SCARG(uap, gid), p, 1));
}
/*
* Set ownership given a path name; this version does not follow links.
*/
/* ARGSUSED */
int
sys_lchown(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
register struct sys_lchown_args /* {
syscallarg(const char *) path;
syscallarg(uid_t) uid;
syscallarg(gid_t) gid;
} */ *uap = v;
int error;
struct nameidata nd;
NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p);
if ((error = namei(&nd)) != 0)
return (error);
error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 0);
vrele(nd.ni_vp);
return (error);
}
/*
* Set ownership given a path name; this version does not follow links.
* Provides POSIX/XPG semantics.
*/
/* ARGSUSED */
int
sys___posix_lchown(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
register struct sys_lchown_args /* {
syscallarg(const char *) path;
syscallarg(uid_t) uid;
syscallarg(gid_t) gid;
} */ *uap = v;
int error;
struct nameidata nd;
NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p);
if ((error = namei(&nd)) != 0)
return (error);
error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 1);
vrele(nd.ni_vp);
return (error);
}
/*
* Common routine to set ownership given a vnode.
*/
static int
change_owner(vp, uid, gid, p, posix_semantics)
register struct vnode *vp;
uid_t uid;
gid_t gid;
struct proc *p;
int posix_semantics;
{
struct vattr vattr;
mode_t newmode;
int error;
VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE);
VOP_LOCK(vp);
if (vp->v_mount->mnt_flag & MNT_RDONLY) {
error = EROFS;
goto out;
}
if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0)
goto out;
#define CHANGED(x) ((x) != -1)
/*
* If we don't own the file, are trying to change the owner
* of the file, or are not a member of the target group,
* the caller must be superuser or the call fails.
*/
if ((p->p_ucred->cr_uid != vattr.va_uid ||
(CHANGED(uid) && uid != vattr.va_uid) ||
(CHANGED(gid) && !groupmember(gid, p->p_ucred))) &&
((error = suser(p->p_ucred, &p->p_acflag)) != 0))
goto out;
newmode = vattr.va_mode;
if (posix_semantics) {
/*
* POSIX/XPG semantics: clear set-user-id and set-group-id
* bits, unless the caller is the super-user.
*/
if (suser(p->p_ucred, NULL) != 0)
newmode &= ~(S_ISUID | S_ISGID);
} else {
/*
* NetBSD semantics: when changing owner and/or group,
* clear the respective bit(s).
*/
if (CHANGED(uid))
newmode &= ~S_ISUID;
if (CHANGED(gid))
newmode &= ~S_ISGID;
}
/* Update va_mode iff altered. */
if (vattr.va_mode == newmode)
newmode = VNOVAL;
VATTR_NULL(&vattr);
vattr.va_uid = CHANGED(uid) ? uid : VNOVAL;
vattr.va_gid = CHANGED(gid) ? gid : VNOVAL;
vattr.va_mode = newmode;
error = VOP_SETATTR(vp, &vattr, p->p_ucred, p);
#undef CHANGED
out:
VOP_UNLOCK(vp);
return (error);
}
/*
* Set the access and modification times given a path name; this
* version follows links.
*/
/* ARGSUSED */
int
sys_utimes(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
register struct sys_utimes_args /* {
syscallarg(const char *) path;
syscallarg(const struct timeval *) tptr;
} */ *uap = v;
int error;
struct nameidata nd;
NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p);
if ((error = namei(&nd)) != 0)
return (error);
error = change_utimes(nd.ni_vp, SCARG(uap, tptr), p);
vrele(nd.ni_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(const struct timeval *) tptr;
} */ *uap = v;
int error;
struct file *fp;
if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0)
return (error);
return (change_utimes((struct vnode *)fp->f_data, SCARG(uap, tptr),
p));
}
/*
* Set the access and modification times given a path name; this
* version does not follow links.
*/
/* ARGSUSED */
int
sys_lutimes(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
register struct sys_lutimes_args /* {
syscallarg(const char *) path;
syscallarg(const struct timeval *) tptr;
} */ *uap = v;
int error;
struct nameidata nd;
NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p);
if ((error = namei(&nd)) != 0)
return (error);
error = change_utimes(nd.ni_vp, SCARG(uap, tptr), p);
vrele(nd.ni_vp);
return (error);
}
/*
* Common routine to set access and modification times given a vnode.
*/
static int
change_utimes(vp, tptr, p)
struct vnode *vp;
const struct timeval *tptr;
struct proc *p;
{
struct timeval tv[2];
struct vattr vattr;
int error;
VATTR_NULL(&vattr);
if (tptr == NULL) {
microtime(&tv[0]);
tv[1] = tv[0];
vattr.va_vaflags |= VA_UTIMES_NULL;
} else {
error = copyin(tptr, tv, sizeof (tv));
if (error)
return (error);
}
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(const 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, (standard) BSD semantics frontend.
*/
/* ARGSUSED */
int
sys_rename(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
register struct sys_rename_args /* {
syscallarg(const char *) from;
syscallarg(const char *) to;
} */ *uap = v;
return (rename_files(SCARG(uap, from), SCARG(uap, to), p, 0));
}
/*
* Rename files, POSIX semantics frontend.
*/
/* ARGSUSED */
int
sys___posix_rename(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
register struct sys___posix_rename_args /* {
syscallarg(const char *) from;
syscallarg(const char *) to;
} */ *uap = v;
return (rename_files(SCARG(uap, from), SCARG(uap, to), p, 1));
}
/*
* Rename files. Source and destination must either both be directories,
* or both not be directories. If target is a directory, it must be empty.
* If `from' and `to' refer to the same object, the value of the `retain'
* argument is used to determine whether `from' will be
*
* (retain == 0) deleted unless `from' and `to' refer to the same
* object in the file system's name space (BSD).
* (retain == 1) always retained (POSIX).
*/
static int
rename_files(from, to, p, retain)
const char *from, *to;
struct proc *p;
int retain;
{
register struct vnode *tvp, *fvp, *tdvp;
struct nameidata fromnd, tond;
int error;
NDINIT(&fromnd, DELETE, WANTPARENT | SAVESTART, UIO_USERSPACE,
from, p);
if ((error = namei(&fromnd)) != 0)
return (error);
fvp = fromnd.ni_vp;
NDINIT(&tond, RENAME, LOCKPARENT | LOCKLEAF | NOCACHE | SAVESTART,
UIO_USERSPACE, 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;
/*
* Source and destination refer to the same object.
*/
if (fvp == tvp) {
if (retain)
error = -1;
else if (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) {
#if defined(UVM)
(void)uvm_vnp_uncache(tvp);
#else
(void)vnode_pager_uncache(tvp);
#endif
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);
return (error == -1 ? 0 : 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(const 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(const 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_getdents(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
register struct sys_getdents_args /* {
syscallarg(int) fd;
syscallarg(char *) buf;
syscallarg(size_t) count;
} */ *uap = v;
struct file *fp;
int error, done;
if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0)
return (error);
if ((fp->f_flag & FREAD) == 0)
return (EBADF);
error = vn_readdir(fp, SCARG(uap, buf), UIO_USERSPACE,
SCARG(uap, count), &done, p, 0, 0);
*retval = done;
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(mode_t) 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(const 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)) != 0)
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);
}
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