Net2/usr/src/sys/kern/vfs_syscalls.c
/*
* Copyright (c) 1989 The Regents of the University of California.
* All rights reserved.
*
* 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 7.74 (Berkeley) 6/21/91
*/
#include "param.h"
#include "systm.h"
#include "namei.h"
#include "filedesc.h"
#include "kernel.h"
#include "file.h"
#include "stat.h"
#include "vnode.h"
#include "mount.h"
#include "proc.h"
#include "uio.h"
#include "malloc.h"
/*
* Virtual File System System Calls
*/
/*
* Mount system call.
*/
/* ARGSUSED */
mount(p, uap, retval)
struct proc *p;
register struct args {
int type;
char *dir;
int flags;
caddr_t data;
} *uap;
int *retval;
{
register struct nameidata *ndp;
register struct vnode *vp;
register struct mount *mp;
int error, flag;
struct nameidata nd;
/*
* Must be super user
*/
if (error = suser(p->p_ucred, &p->p_acflag))
return (error);
/*
* Get vnode to be covered
*/
ndp = &nd;
ndp->ni_nameiop = LOOKUP | FOLLOW | LOCKLEAF;
ndp->ni_segflg = UIO_USERSPACE;
ndp->ni_dirp = uap->dir;
if (error = namei(ndp, p))
return (error);
vp = ndp->ni_vp;
if (uap->flags & MNT_UPDATE) {
if ((vp->v_flag & VROOT) == 0) {
vput(vp);
return (EINVAL);
}
mp = vp->v_mount;
/*
* We allow going from read-only to read-write,
* but not from read-write to read-only.
*/
if ((mp->mnt_flag & MNT_RDONLY) == 0 &&
(uap->flags & MNT_RDONLY) != 0) {
vput(vp);
return (EOPNOTSUPP); /* Needs translation */
}
flag = mp->mnt_flag;
mp->mnt_flag |= MNT_UPDATE;
VOP_UNLOCK(vp);
goto update;
}
vinvalbuf(vp, 1);
if (vp->v_usecount != 1) {
vput(vp);
return (EBUSY);
}
if (vp->v_type != VDIR) {
vput(vp);
return (ENOTDIR);
}
if ((unsigned long)uap->type > MOUNT_MAXTYPE ||
vfssw[uap->type] == (struct vfsops *)0) {
vput(vp);
return (ENODEV);
}
/*
* Allocate and initialize the file system.
*/
mp = (struct mount *)malloc((u_long)sizeof(struct mount),
M_MOUNT, M_WAITOK);
mp->mnt_op = vfssw[uap->type];
mp->mnt_flag = 0;
mp->mnt_exroot = 0;
mp->mnt_mounth = NULLVP;
if (error = vfs_lock(mp)) {
free((caddr_t)mp, M_MOUNT);
vput(vp);
return (error);
}
if (vp->v_mountedhere != (struct mount *)0) {
vfs_unlock(mp);
free((caddr_t)mp, M_MOUNT);
vput(vp);
return (EBUSY);
}
vp->v_mountedhere = mp;
mp->mnt_vnodecovered = vp;
update:
/*
* Set the mount level flags.
*/
if (uap->flags & MNT_RDONLY)
mp->mnt_flag |= MNT_RDONLY;
else
mp->mnt_flag &= ~MNT_RDONLY;
if (uap->flags & MNT_NOSUID)
mp->mnt_flag |= MNT_NOSUID;
else
mp->mnt_flag &= ~MNT_NOSUID;
if (uap->flags & MNT_NOEXEC)
mp->mnt_flag |= MNT_NOEXEC;
else
mp->mnt_flag &= ~MNT_NOEXEC;
if (uap->flags & MNT_NODEV)
mp->mnt_flag |= MNT_NODEV;
else
mp->mnt_flag &= ~MNT_NODEV;
if (uap->flags & MNT_SYNCHRONOUS)
mp->mnt_flag |= MNT_SYNCHRONOUS;
else
mp->mnt_flag &= ~MNT_SYNCHRONOUS;
/*
* Mount the filesystem.
*/
error = VFS_MOUNT(mp, uap->dir, uap->data, ndp, p);
if (mp->mnt_flag & MNT_UPDATE) {
mp->mnt_flag &= ~MNT_UPDATE;
vrele(vp);
if (error)
mp->mnt_flag = flag;
return (error);
}
/*
* Put the new filesystem on the mount list after root.
*/
mp->mnt_next = rootfs->mnt_next;
mp->mnt_prev = rootfs;
rootfs->mnt_next = mp;
mp->mnt_next->mnt_prev = mp;
cache_purge(vp);
if (!error) {
VOP_UNLOCK(vp);
vfs_unlock(mp);
error = VFS_START(mp, 0, p);
} else {
vfs_remove(mp);
free((caddr_t)mp, M_MOUNT);
vput(vp);
}
return (error);
}
/*
* Unmount system call.
*
* Note: unmount takes a path to the vnode mounted on as argument,
* not special file (as before).
*/
/* ARGSUSED */
unmount(p, uap, retval)
struct proc *p;
register struct args {
char *pathp;
int flags;
} *uap;
int *retval;
{
register struct vnode *vp;
register struct nameidata *ndp;
struct mount *mp;
int error;
struct nameidata nd;
/*
* Must be super user
*/
if (error = suser(p->p_ucred, &p->p_acflag))
return (error);
ndp = &nd;
ndp->ni_nameiop = LOOKUP | LOCKLEAF | FOLLOW;
ndp->ni_segflg = UIO_USERSPACE;
ndp->ni_dirp = uap->pathp;
if (error = namei(ndp, p))
return (error);
vp = ndp->ni_vp;
/*
* Must be the root of the filesystem
*/
if ((vp->v_flag & VROOT) == 0) {
vput(vp);
return (EINVAL);
}
mp = vp->v_mount;
vput(vp);
return (dounmount(mp, uap->flags, p));
}
/*
* Do an unmount.
*/
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))
return (error);
vnode_pager_umount(mp); /* release cached vnodes */
cache_purgevfs(mp); /* remove cache entries for this file sys */
if ((error = VFS_SYNC(mp, MNT_WAIT)) == 0 || (flags & MNT_FORCE))
error = VFS_UNMOUNT(mp, flags, p);
mp->mnt_flag &= ~MNT_UNMOUNT;
vfs_unbusy(mp);
if (error) {
vfs_unlock(mp);
} else {
vrele(coveredvp);
vfs_remove(mp);
free((caddr_t)mp, M_MOUNT);
}
return (error);
}
/*
* Sync system call.
* Sync each mounted filesystem.
*/
/* ARGSUSED */
sync(p, uap, retval)
struct proc *p;
void *uap;
int *retval;
{
register struct mount *mp;
struct mount *omp;
mp = rootfs;
do {
/*
* 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)) {
VFS_SYNC(mp, MNT_NOWAIT);
omp = mp;
mp = mp->mnt_next;
vfs_unbusy(omp);
} else
mp = mp->mnt_next;
} while (mp != rootfs);
return (0);
}
/*
* Operate on filesystem quotas.
*/
/* ARGSUSED */
quotactl(p, uap, retval)
struct proc *p;
register struct args {
char *path;
int cmd;
int uid;
caddr_t arg;
} *uap;
int *retval;
{
register struct mount *mp;
register struct nameidata *ndp;
int error;
struct nameidata nd;
ndp = &nd;
ndp->ni_nameiop = LOOKUP | FOLLOW;
ndp->ni_segflg = UIO_USERSPACE;
ndp->ni_dirp = uap->path;
if (error = namei(ndp, p))
return (error);
mp = ndp->ni_vp->v_mount;
vrele(ndp->ni_vp);
return (VFS_QUOTACTL(mp, uap->cmd, uap->uid, uap->arg, p));
}
/*
* Get filesystem statistics.
*/
/* ARGSUSED */
statfs(p, uap, retval)
struct proc *p;
register struct args {
char *path;
struct statfs *buf;
} *uap;
int *retval;
{
register struct mount *mp;
register struct nameidata *ndp;
register struct statfs *sp;
int error;
struct nameidata nd;
ndp = &nd;
ndp->ni_nameiop = LOOKUP | FOLLOW;
ndp->ni_segflg = UIO_USERSPACE;
ndp->ni_dirp = uap->path;
if (error = namei(ndp, p))
return (error);
mp = ndp->ni_vp->v_mount;
sp = &mp->mnt_stat;
vrele(ndp->ni_vp);
if (error = VFS_STATFS(mp, sp, p))
return (error);
sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK;
return (copyout((caddr_t)sp, (caddr_t)uap->buf, sizeof(*sp)));
}
/*
* Get filesystem statistics.
*/
/* ARGSUSED */
fstatfs(p, uap, retval)
struct proc *p;
register struct args {
int fd;
struct statfs *buf;
} *uap;
int *retval;
{
struct file *fp;
struct mount *mp;
register struct statfs *sp;
int error;
if (error = getvnode(p->p_fd, uap->fd, &fp))
return (error);
mp = ((struct vnode *)fp->f_data)->v_mount;
sp = &mp->mnt_stat;
if (error = VFS_STATFS(mp, sp, p))
return (error);
sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK;
return (copyout((caddr_t)sp, (caddr_t)uap->buf, sizeof(*sp)));
}
/*
* Get statistics on all filesystems.
*/
getfsstat(p, uap, retval)
struct proc *p;
register struct args {
struct statfs *buf;
long bufsize;
int flags;
} *uap;
int *retval;
{
register struct mount *mp;
register struct statfs *sp;
caddr_t sfsp;
long count, maxcount, error;
maxcount = uap->bufsize / sizeof(struct statfs);
sfsp = (caddr_t)uap->buf;
mp = rootfs;
count = 0;
do {
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 (((uap->flags & MNT_NOWAIT) == 0 ||
(uap->flags & MNT_WAIT)) &&
(error = VFS_STATFS(mp, sp, p))) {
mp = mp->mnt_prev;
continue;
}
sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK;
if (error = copyout((caddr_t)sp, sfsp, sizeof(*sp)))
return (error);
sfsp += sizeof(*sp);
}
count++;
mp = mp->mnt_prev;
} while (mp != rootfs);
if (sfsp && count > maxcount)
*retval = maxcount;
else
*retval = count;
return (0);
}
/*
* Change current working directory to a given file descriptor.
*/
/* ARGSUSED */
fchdir(p, uap, retval)
struct proc *p;
struct args {
int fd;
} *uap;
int *retval;
{
register struct filedesc *fdp = p->p_fd;
register struct vnode *vp;
struct file *fp;
int error;
if (error = getvnode(fdp, uap->fd, &fp))
return (error);
vp = (struct vnode *)fp->f_data;
VOP_LOCK(vp);
if (vp->v_type != VDIR)
error = ENOTDIR;
else
error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p);
VOP_UNLOCK(vp);
if (error)
return (error);
VREF(vp);
vrele(fdp->fd_cdir);
fdp->fd_cdir = vp;
return (0);
}
/*
* Change current working directory (``.'').
*/
/* ARGSUSED */
chdir(p, uap, retval)
struct proc *p;
struct args {
char *fname;
} *uap;
int *retval;
{
register struct nameidata *ndp;
register struct filedesc *fdp = p->p_fd;
int error;
struct nameidata nd;
ndp = &nd;
ndp->ni_nameiop = LOOKUP | FOLLOW | LOCKLEAF;
ndp->ni_segflg = UIO_USERSPACE;
ndp->ni_dirp = uap->fname;
if (error = chdirec(ndp, p))
return (error);
vrele(fdp->fd_cdir);
fdp->fd_cdir = ndp->ni_vp;
return (0);
}
/*
* Change notion of root (``/'') directory.
*/
/* ARGSUSED */
chroot(p, uap, retval)
struct proc *p;
struct args {
char *fname;
} *uap;
int *retval;
{
register struct nameidata *ndp;
register struct filedesc *fdp = p->p_fd;
int error;
struct nameidata nd;
if (error = suser(p->p_ucred, &p->p_acflag))
return (error);
ndp = &nd;
ndp->ni_nameiop = LOOKUP | FOLLOW | LOCKLEAF;
ndp->ni_segflg = UIO_USERSPACE;
ndp->ni_dirp = uap->fname;
if (error = chdirec(ndp, p))
return (error);
if (fdp->fd_rdir != NULL)
vrele(fdp->fd_rdir);
fdp->fd_rdir = ndp->ni_vp;
return (0);
}
/*
* Common routine for chroot and chdir.
*/
chdirec(ndp, p)
struct nameidata *ndp;
struct proc *p;
{
struct vnode *vp;
int error;
if (error = namei(ndp, p))
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);
}
/*
* Open system call.
* Check permissions, allocate an open file structure,
* and call the device open routine if any.
*/
open(p, uap, retval)
struct proc *p;
register struct args {
char *fname;
int mode;
int crtmode;
} *uap;
int *retval;
{
struct nameidata *ndp;
register struct filedesc *fdp = p->p_fd;
register struct file *fp;
register struct vnode *vp;
int fmode, cmode;
struct file *nfp;
int type, indx, error;
struct flock lf;
struct nameidata nd;
extern struct fileops vnops;
if (error = falloc(p, &nfp, &indx))
return (error);
fp = nfp;
fmode = FFLAGS(uap->mode);
cmode = ((uap->crtmode &~ fdp->fd_cmask) & 07777) &~ S_ISVTX;
ndp = &nd;
ndp->ni_segflg = UIO_USERSPACE;
ndp->ni_dirp = uap->fname;
p->p_dupfd = -indx - 1; /* XXX check for fdopen */
if (error = vn_open(ndp, p, fmode, cmode)) {
ffree(fp);
if (error == ENODEV && /* XXX from fdopen */
p->p_dupfd >= 0 &&
(error = dupfdopen(fdp, indx, p->p_dupfd, fmode)) == 0) {
*retval = indx;
return (0);
}
if (error == ERESTART)
error = EINTR;
fdp->fd_ofiles[indx] = NULL;
return (error);
}
vp = ndp->ni_vp;
fp->f_flag = fmode & FMASK;
if (fmode & (O_EXLOCK | O_SHLOCK)) {
lf.l_whence = SEEK_SET;
lf.l_start = 0;
lf.l_len = 0;
if (fmode & O_EXLOCK)
lf.l_type = F_WRLCK;
else
lf.l_type = F_RDLCK;
type = F_FLOCK;
if ((fmode & FNONBLOCK) == 0)
type |= F_WAIT;
if (error = VOP_ADVLOCK(vp, (caddr_t)fp, F_SETLK, &lf, type)) {
VOP_UNLOCK(vp);
(void) vn_close(vp, fp->f_flag, fp->f_cred, p);
ffree(fp);
fdp->fd_ofiles[indx] = NULL;
return (error);
}
fp->f_flag |= FHASLOCK;
}
VOP_UNLOCK(vp);
fp->f_type = DTYPE_VNODE;
fp->f_ops = &vnops;
fp->f_data = (caddr_t)vp;
*retval = indx;
return (0);
}
#ifdef COMPAT_43
/*
* Creat system call.
*/
ocreat(p, uap, retval)
struct proc *p;
register struct args {
char *fname;
int fmode;
} *uap;
int *retval;
{
struct args {
char *fname;
int mode;
int crtmode;
} openuap;
openuap.fname = uap->fname;
openuap.crtmode = uap->fmode;
openuap.mode = O_WRONLY | O_CREAT | O_TRUNC;
return (open(p, &openuap, retval));
}
#endif /* COMPAT_43 */
/*
* Mknod system call.
*/
/* ARGSUSED */
mknod(p, uap, retval)
struct proc *p;
register struct args {
char *fname;
int fmode;
int dev;
} *uap;
int *retval;
{
register struct nameidata *ndp;
register struct vnode *vp;
struct vattr vattr;
int error;
struct nameidata nd;
if (error = suser(p->p_ucred, &p->p_acflag))
return (error);
ndp = &nd;
ndp->ni_nameiop = CREATE | LOCKPARENT;
ndp->ni_segflg = UIO_USERSPACE;
ndp->ni_dirp = uap->fname;
if (error = namei(ndp, p))
return (error);
vp = ndp->ni_vp;
if (vp != NULL) {
error = EEXIST;
goto out;
}
VATTR_NULL(&vattr);
switch (uap->fmode & 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;
default:
error = EINVAL;
goto out;
}
vattr.va_mode = (uap->fmode & 07777) &~ p->p_fd->fd_cmask;
vattr.va_rdev = uap->dev;
out:
if (!error) {
error = VOP_MKNOD(ndp, &vattr, p->p_ucred, p);
} else {
VOP_ABORTOP(ndp);
if (ndp->ni_dvp == vp)
vrele(ndp->ni_dvp);
else
vput(ndp->ni_dvp);
if (vp)
vrele(vp);
}
return (error);
}
/*
* Mkfifo system call.
*/
/* ARGSUSED */
mkfifo(p, uap, retval)
struct proc *p;
register struct args {
char *fname;
int fmode;
} *uap;
int *retval;
{
register struct nameidata *ndp;
struct vattr vattr;
int error;
struct nameidata nd;
#ifndef FIFO
return (EOPNOTSUPP);
#else
ndp = &nd;
ndp->ni_nameiop = CREATE | LOCKPARENT;
ndp->ni_segflg = UIO_USERSPACE;
ndp->ni_dirp = uap->fname;
if (error = namei(ndp, p))
return (error);
if (ndp->ni_vp != NULL) {
VOP_ABORTOP(ndp);
if (ndp->ni_dvp == ndp->ni_vp)
vrele(ndp->ni_dvp);
else
vput(ndp->ni_dvp);
vrele(ndp->ni_vp);
return (EEXIST);
}
VATTR_NULL(&vattr);
vattr.va_type = VFIFO;
vattr.va_mode = (uap->fmode & 07777) &~ p->p_fd->fd_cmask;
return (VOP_MKNOD(ndp, &vattr, p->p_ucred, p));
#endif /* FIFO */
}
/*
* Link system call.
*/
/* ARGSUSED */
link(p, uap, retval)
struct proc *p;
register struct args {
char *target;
char *linkname;
} *uap;
int *retval;
{
register struct nameidata *ndp;
register struct vnode *vp, *xp;
int error;
struct nameidata nd;
ndp = &nd;
ndp->ni_nameiop = LOOKUP | FOLLOW;
ndp->ni_segflg = UIO_USERSPACE;
ndp->ni_dirp = uap->target;
if (error = namei(ndp, p))
return (error);
vp = ndp->ni_vp;
if (vp->v_type == VDIR &&
(error = suser(p->p_ucred, &p->p_acflag)))
goto out1;
ndp->ni_nameiop = CREATE | LOCKPARENT;
ndp->ni_dirp = (caddr_t)uap->linkname;
if (error = namei(ndp, p))
goto out1;
xp = ndp->ni_vp;
if (xp != NULL) {
error = EEXIST;
goto out;
}
xp = ndp->ni_dvp;
if (vp->v_mount != xp->v_mount)
error = EXDEV;
out:
if (!error) {
error = VOP_LINK(vp, ndp, p);
} else {
VOP_ABORTOP(ndp);
if (ndp->ni_dvp == ndp->ni_vp)
vrele(ndp->ni_dvp);
else
vput(ndp->ni_dvp);
if (ndp->ni_vp)
vrele(ndp->ni_vp);
}
out1:
vrele(vp);
return (error);
}
/*
* Make a symbolic link.
*/
/* ARGSUSED */
symlink(p, uap, retval)
struct proc *p;
register struct args {
char *target;
char *linkname;
} *uap;
int *retval;
{
register struct nameidata *ndp;
struct vattr vattr;
char *target;
int error;
struct nameidata nd;
ndp = &nd;
ndp->ni_segflg = UIO_USERSPACE;
ndp->ni_dirp = uap->linkname;
MALLOC(target, char *, MAXPATHLEN, M_NAMEI, M_WAITOK);
if (error = copyinstr(uap->target, target, MAXPATHLEN, (u_int *)0))
goto out;
ndp->ni_nameiop = CREATE | LOCKPARENT;
if (error = namei(ndp, p))
goto out;
if (ndp->ni_vp) {
VOP_ABORTOP(ndp);
if (ndp->ni_dvp == ndp->ni_vp)
vrele(ndp->ni_dvp);
else
vput(ndp->ni_dvp);
vrele(ndp->ni_vp);
error = EEXIST;
goto out;
}
VATTR_NULL(&vattr);
vattr.va_mode = 0777 &~ p->p_fd->fd_cmask;
error = VOP_SYMLINK(ndp, &vattr, target, p);
out:
FREE(target, M_NAMEI);
return (error);
}
/*
* Delete a name from the filesystem.
*/
/* ARGSUSED */
unlink(p, uap, retval)
struct proc *p;
struct args {
char *fname;
} *uap;
int *retval;
{
register struct nameidata *ndp;
register struct vnode *vp;
int error;
struct nameidata nd;
ndp = &nd;
ndp->ni_nameiop = DELETE | LOCKPARENT | LOCKLEAF;
ndp->ni_segflg = UIO_USERSPACE;
ndp->ni_dirp = uap->fname;
if (error = namei(ndp, p))
return (error);
vp = ndp->ni_vp;
if (vp->v_type == VDIR &&
(error = suser(p->p_ucred, &p->p_acflag)))
goto out;
/*
* The root of a mounted filesystem cannot be deleted.
*/
if (vp->v_flag & VROOT) {
error = EBUSY;
goto out;
}
(void) vnode_pager_uncache(vp);
out:
if (!error) {
error = VOP_REMOVE(ndp, p);
} else {
VOP_ABORTOP(ndp);
if (ndp->ni_dvp == vp)
vrele(ndp->ni_dvp);
else
vput(ndp->ni_dvp);
vput(vp);
}
return (error);
}
/*
* Seek system call.
*/
lseek(p, uap, retval)
struct proc *p;
register struct args {
int fdes;
off_t off;
int sbase;
} *uap;
off_t *retval;
{
struct ucred *cred = p->p_ucred;
register struct filedesc *fdp = p->p_fd;
register struct file *fp;
struct vattr vattr;
int error;
if ((unsigned)uap->fdes >= fdp->fd_nfiles ||
(fp = fdp->fd_ofiles[uap->fdes]) == NULL)
return (EBADF);
if (fp->f_type != DTYPE_VNODE)
return (ESPIPE);
switch (uap->sbase) {
case L_INCR:
fp->f_offset += uap->off;
break;
case L_XTND:
if (error = VOP_GETATTR((struct vnode *)fp->f_data,
&vattr, cred, p))
return (error);
fp->f_offset = uap->off + vattr.va_size;
break;
case L_SET:
fp->f_offset = uap->off;
break;
default:
return (EINVAL);
}
*retval = fp->f_offset;
return (0);
}
/*
* Check access permissions.
*/
/* ARGSUSED */
saccess(p, uap, retval)
struct proc *p;
register struct args {
char *fname;
int fmode;
} *uap;
int *retval;
{
register struct nameidata *ndp;
register struct ucred *cred = p->p_ucred;
register struct vnode *vp;
int error, mode, svuid, svgid;
struct nameidata nd;
ndp = &nd;
svuid = cred->cr_uid;
svgid = cred->cr_groups[0];
cred->cr_uid = p->p_cred->p_ruid;
cred->cr_groups[0] = p->p_cred->p_rgid;
ndp->ni_nameiop = LOOKUP | FOLLOW | LOCKLEAF;
ndp->ni_segflg = UIO_USERSPACE;
ndp->ni_dirp = uap->fname;
if (error = namei(ndp, p))
goto out1;
vp = ndp->ni_vp;
/*
* fmode == 0 means only check for exist
*/
if (uap->fmode) {
mode = 0;
if (uap->fmode & R_OK)
mode |= VREAD;
if (uap->fmode & W_OK)
mode |= VWRITE;
if (uap->fmode & X_OK)
mode |= VEXEC;
if ((mode & VWRITE) == 0 || (error = vn_writechk(vp)) == 0)
error = VOP_ACCESS(vp, mode, cred, p);
}
vput(vp);
out1:
cred->cr_uid = svuid;
cred->cr_groups[0] = svgid;
return (error);
}
/*
* Stat system call.
* This version follows links.
*/
/* ARGSUSED */
stat(p, uap, retval)
struct proc *p;
register struct args {
char *fname;
struct stat *ub;
} *uap;
int *retval;
{
register struct nameidata *ndp;
struct stat sb;
int error;
struct nameidata nd;
ndp = &nd;
ndp->ni_nameiop = LOOKUP | LOCKLEAF | FOLLOW;
ndp->ni_segflg = UIO_USERSPACE;
ndp->ni_dirp = uap->fname;
if (error = namei(ndp, p))
return (error);
error = vn_stat(ndp->ni_vp, &sb, p);
vput(ndp->ni_vp);
if (error)
return (error);
error = copyout((caddr_t)&sb, (caddr_t)uap->ub, sizeof (sb));
return (error);
}
/*
* Lstat system call.
* This version does not follow links.
*/
/* ARGSUSED */
lstat(p, uap, retval)
struct proc *p;
register struct args {
char *fname;
struct stat *ub;
} *uap;
int *retval;
{
register struct nameidata *ndp;
struct stat sb;
int error;
struct nameidata nd;
ndp = &nd;
ndp->ni_nameiop = LOOKUP | LOCKLEAF | NOFOLLOW;
ndp->ni_segflg = UIO_USERSPACE;
ndp->ni_dirp = uap->fname;
if (error = namei(ndp, p))
return (error);
error = vn_stat(ndp->ni_vp, &sb, p);
vput(ndp->ni_vp);
if (error)
return (error);
error = copyout((caddr_t)&sb, (caddr_t)uap->ub, sizeof (sb));
return (error);
}
/*
* Return target name of a symbolic link.
*/
/* ARGSUSED */
readlink(p, uap, retval)
struct proc *p;
register struct args {
char *name;
char *buf;
int count;
} *uap;
int *retval;
{
register struct nameidata *ndp;
register struct vnode *vp;
struct iovec aiov;
struct uio auio;
int error;
struct nameidata nd;
ndp = &nd;
ndp->ni_nameiop = LOOKUP | LOCKLEAF;
ndp->ni_segflg = UIO_USERSPACE;
ndp->ni_dirp = uap->name;
if (error = namei(ndp, p))
return (error);
vp = ndp->ni_vp;
if (vp->v_type != VLNK) {
error = EINVAL;
goto out;
}
aiov.iov_base = uap->buf;
aiov.iov_len = 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 = uap->count;
error = VOP_READLINK(vp, &auio, p->p_ucred);
out:
vput(vp);
*retval = uap->count - auio.uio_resid;
return (error);
}
/*
* Change flags of a file given path name.
*/
/* ARGSUSED */
chflags(p, uap, retval)
struct proc *p;
register struct args {
char *fname;
int flags;
} *uap;
int *retval;
{
register struct nameidata *ndp;
register struct vnode *vp;
struct vattr vattr;
int error;
struct nameidata nd;
ndp = &nd;
ndp->ni_nameiop = LOOKUP | FOLLOW | LOCKLEAF;
ndp->ni_segflg = UIO_USERSPACE;
ndp->ni_dirp = uap->fname;
if (error = namei(ndp, p))
return (error);
vp = ndp->ni_vp;
if (vp->v_mount->mnt_flag & MNT_RDONLY) {
error = EROFS;
goto out;
}
VATTR_NULL(&vattr);
vattr.va_flags = uap->flags;
error = VOP_SETATTR(vp, &vattr, p->p_ucred, p);
out:
vput(vp);
return (error);
}
/*
* Change flags of a file given a file descriptor.
*/
/* ARGSUSED */
fchflags(p, uap, retval)
struct proc *p;
register struct args {
int fd;
int flags;
} *uap;
int *retval;
{
struct vattr vattr;
struct vnode *vp;
struct file *fp;
int error;
if (error = getvnode(p->p_fd, uap->fd, &fp))
return (error);
vp = (struct vnode *)fp->f_data;
VOP_LOCK(vp);
if (vp->v_mount->mnt_flag & MNT_RDONLY) {
error = EROFS;
goto out;
}
VATTR_NULL(&vattr);
vattr.va_flags = uap->flags;
error = VOP_SETATTR(vp, &vattr, p->p_ucred, p);
out:
VOP_UNLOCK(vp);
return (error);
}
/*
* Change mode of a file given path name.
*/
/* ARGSUSED */
chmod(p, uap, retval)
struct proc *p;
register struct args {
char *fname;
int fmode;
} *uap;
int *retval;
{
register struct nameidata *ndp;
register struct vnode *vp;
struct vattr vattr;
int error;
struct nameidata nd;
ndp = &nd;
ndp->ni_nameiop = LOOKUP | FOLLOW | LOCKLEAF;
ndp->ni_segflg = UIO_USERSPACE;
ndp->ni_dirp = uap->fname;
if (error = namei(ndp, p))
return (error);
vp = ndp->ni_vp;
if (vp->v_mount->mnt_flag & MNT_RDONLY) {
error = EROFS;
goto out;
}
VATTR_NULL(&vattr);
vattr.va_mode = uap->fmode & 07777;
error = VOP_SETATTR(vp, &vattr, p->p_ucred, p);
out:
vput(vp);
return (error);
}
/*
* Change mode of a file given a file descriptor.
*/
/* ARGSUSED */
fchmod(p, uap, retval)
struct proc *p;
register struct args {
int fd;
int fmode;
} *uap;
int *retval;
{
struct vattr vattr;
struct vnode *vp;
struct file *fp;
int error;
if (error = getvnode(p->p_fd, uap->fd, &fp))
return (error);
vp = (struct vnode *)fp->f_data;
VOP_LOCK(vp);
if (vp->v_mount->mnt_flag & MNT_RDONLY) {
error = EROFS;
goto out;
}
VATTR_NULL(&vattr);
vattr.va_mode = uap->fmode & 07777;
error = VOP_SETATTR(vp, &vattr, p->p_ucred, p);
out:
VOP_UNLOCK(vp);
return (error);
}
/*
* Set ownership given a path name.
*/
/* ARGSUSED */
chown(p, uap, retval)
struct proc *p;
register struct args {
char *fname;
int uid;
int gid;
} *uap;
int *retval;
{
register struct nameidata *ndp;
register struct vnode *vp;
struct vattr vattr;
int error;
struct nameidata nd;
ndp = &nd;
ndp->ni_nameiop = LOOKUP | NOFOLLOW | LOCKLEAF;
ndp->ni_segflg = UIO_USERSPACE;
ndp->ni_dirp = uap->fname;
if (error = namei(ndp, p))
return (error);
vp = ndp->ni_vp;
if (vp->v_mount->mnt_flag & MNT_RDONLY) {
error = EROFS;
goto out;
}
VATTR_NULL(&vattr);
vattr.va_uid = uap->uid;
vattr.va_gid = uap->gid;
error = VOP_SETATTR(vp, &vattr, p->p_ucred, p);
out:
vput(vp);
return (error);
}
/*
* Set ownership given a file descriptor.
*/
/* ARGSUSED */
fchown(p, uap, retval)
struct proc *p;
register struct args {
int fd;
int uid;
int gid;
} *uap;
int *retval;
{
struct vattr vattr;
struct vnode *vp;
struct file *fp;
int error;
if (error = getvnode(p->p_fd, uap->fd, &fp))
return (error);
vp = (struct vnode *)fp->f_data;
VOP_LOCK(vp);
if (vp->v_mount->mnt_flag & MNT_RDONLY) {
error = EROFS;
goto out;
}
VATTR_NULL(&vattr);
vattr.va_uid = uap->uid;
vattr.va_gid = uap->gid;
error = VOP_SETATTR(vp, &vattr, p->p_ucred, p);
out:
VOP_UNLOCK(vp);
return (error);
}
/*
* Set the access and modification times of a file.
*/
/* ARGSUSED */
utimes(p, uap, retval)
struct proc *p;
register struct args {
char *fname;
struct timeval *tptr;
} *uap;
int *retval;
{
register struct nameidata *ndp;
register struct vnode *vp;
struct timeval tv[2];
struct vattr vattr;
int error;
struct nameidata nd;
if (error = copyin((caddr_t)uap->tptr, (caddr_t)tv, sizeof (tv)))
return (error);
ndp = &nd;
ndp->ni_nameiop = LOOKUP | FOLLOW | LOCKLEAF;
ndp->ni_segflg = UIO_USERSPACE;
ndp->ni_dirp = uap->fname;
if (error = namei(ndp, p))
return (error);
vp = ndp->ni_vp;
if (vp->v_mount->mnt_flag & MNT_RDONLY) {
error = EROFS;
goto out;
}
VATTR_NULL(&vattr);
vattr.va_atime = tv[0];
vattr.va_mtime = tv[1];
error = VOP_SETATTR(vp, &vattr, p->p_ucred, p);
out:
vput(vp);
return (error);
}
/*
* Truncate a file given its path name.
*/
/* ARGSUSED */
truncate(p, uap, retval)
struct proc *p;
register struct args {
char *fname;
off_t length;
} *uap;
int *retval;
{
register struct nameidata *ndp;
register struct vnode *vp;
struct vattr vattr;
int error;
struct nameidata nd;
ndp = &nd;
ndp->ni_nameiop = LOOKUP | FOLLOW | LOCKLEAF;
ndp->ni_segflg = UIO_USERSPACE;
ndp->ni_dirp = uap->fname;
if (error = namei(ndp, p))
return (error);
vp = ndp->ni_vp;
if (vp->v_type == VDIR) {
error = EISDIR;
goto out;
}
if ((error = vn_writechk(vp)) ||
(error = VOP_ACCESS(vp, VWRITE, p->p_ucred, p)))
goto out;
VATTR_NULL(&vattr);
vattr.va_size = uap->length;
error = VOP_SETATTR(vp, &vattr, p->p_ucred, p);
out:
vput(vp);
return (error);
}
/*
* Truncate a file given a file descriptor.
*/
/* ARGSUSED */
ftruncate(p, uap, retval)
struct proc *p;
register struct args {
int fd;
off_t length;
} *uap;
int *retval;
{
struct vattr vattr;
struct vnode *vp;
struct file *fp;
int error;
if (error = getvnode(p->p_fd, uap->fd, &fp))
return (error);
if ((fp->f_flag & FWRITE) == 0)
return (EINVAL);
vp = (struct vnode *)fp->f_data;
VOP_LOCK(vp);
if (vp->v_type == VDIR) {
error = EISDIR;
goto out;
}
if (error = vn_writechk(vp))
goto out;
VATTR_NULL(&vattr);
vattr.va_size = uap->length;
error = VOP_SETATTR(vp, &vattr, fp->f_cred, p);
out:
VOP_UNLOCK(vp);
return (error);
}
/*
* Synch an open file.
*/
/* ARGSUSED */
fsync(p, uap, retval)
struct proc *p;
struct args {
int fd;
} *uap;
int *retval;
{
register struct vnode *vp;
struct file *fp;
int error;
if (error = getvnode(p->p_fd, uap->fd, &fp))
return (error);
vp = (struct vnode *)fp->f_data;
VOP_LOCK(vp);
error = VOP_FSYNC(vp, fp->f_flag, fp->f_cred, MNT_WAIT, p);
VOP_UNLOCK(vp);
return (error);
}
/*
* Rename system call.
*
* Source and destination must either both be directories, or both
* not be directories. If target is a directory, it must be empty.
*/
/* ARGSUSED */
rename(p, uap, retval)
struct proc *p;
register struct args {
char *from;
char *to;
} *uap;
int *retval;
{
register struct vnode *tvp, *fvp, *tdvp;
struct nameidata fromnd, tond;
int error;
fromnd.ni_nameiop = DELETE | WANTPARENT | SAVESTART;
fromnd.ni_segflg = UIO_USERSPACE;
fromnd.ni_dirp = uap->from;
if (error = namei(&fromnd, p))
return (error);
fvp = fromnd.ni_vp;
tond.ni_nameiop = RENAME | LOCKPARENT | LOCKLEAF | NOCACHE | SAVESTART;
tond.ni_segflg = UIO_USERSPACE;
tond.ni_dirp = uap->to;
if (error = namei(&tond, p)) {
VOP_ABORTOP(&fromnd);
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->v_mount != tvp->v_mount) {
error = EXDEV;
goto out;
}
}
if (fvp->v_mount != tdvp->v_mount) {
error = EXDEV;
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_namelen == tond.ni_namelen &&
!bcmp(fromnd.ni_ptr, tond.ni_ptr, fromnd.ni_namelen))
error = -1;
out:
if (!error) {
error = VOP_RENAME(&fromnd, &tond, p);
} else {
VOP_ABORTOP(&tond);
if (tdvp == tvp)
vrele(tdvp);
else
vput(tdvp);
if (tvp)
vput(tvp);
VOP_ABORTOP(&fromnd);
vrele(fromnd.ni_dvp);
vrele(fvp);
}
vrele(tond.ni_startdir);
FREE(tond.ni_pnbuf, M_NAMEI);
out1:
vrele(fromnd.ni_startdir);
FREE(fromnd.ni_pnbuf, M_NAMEI);
if (error == -1)
return (0);
return (error);
}
/*
* Mkdir system call.
*/
/* ARGSUSED */
mkdir(p, uap, retval)
struct proc *p;
register struct args {
char *name;
int dmode;
} *uap;
int *retval;
{
register struct nameidata *ndp;
register struct vnode *vp;
struct vattr vattr;
int error;
struct nameidata nd;
ndp = &nd;
ndp->ni_nameiop = CREATE | LOCKPARENT;
ndp->ni_segflg = UIO_USERSPACE;
ndp->ni_dirp = uap->name;
if (error = namei(ndp, p))
return (error);
vp = ndp->ni_vp;
if (vp != NULL) {
VOP_ABORTOP(ndp);
if (ndp->ni_dvp == vp)
vrele(ndp->ni_dvp);
else
vput(ndp->ni_dvp);
vrele(vp);
return (EEXIST);
}
VATTR_NULL(&vattr);
vattr.va_type = VDIR;
vattr.va_mode = (uap->dmode & 0777) &~ p->p_fd->fd_cmask;
error = VOP_MKDIR(ndp, &vattr, p);
if (!error)
vput(ndp->ni_vp);
return (error);
}
/*
* Rmdir system call.
*/
/* ARGSUSED */
rmdir(p, uap, retval)
struct proc *p;
struct args {
char *name;
} *uap;
int *retval;
{
register struct nameidata *ndp;
register struct vnode *vp;
int error;
struct nameidata nd;
ndp = &nd;
ndp->ni_nameiop = DELETE | LOCKPARENT | LOCKLEAF;
ndp->ni_segflg = UIO_USERSPACE;
ndp->ni_dirp = uap->name;
if (error = namei(ndp, p))
return (error);
vp = ndp->ni_vp;
if (vp->v_type != VDIR) {
error = ENOTDIR;
goto out;
}
/*
* No rmdir "." please.
*/
if (ndp->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) {
error = VOP_RMDIR(ndp, p);
} else {
VOP_ABORTOP(ndp);
if (ndp->ni_dvp == vp)
vrele(ndp->ni_dvp);
else
vput(ndp->ni_dvp);
vput(vp);
}
return (error);
}
/*
* Read a block of directory entries in a file system independent format.
*/
getdirentries(p, uap, retval)
struct proc *p;
register struct args {
int fd;
char *buf;
unsigned count;
long *basep;
} *uap;
int *retval;
{
register struct vnode *vp;
struct file *fp;
struct uio auio;
struct iovec aiov;
off_t off;
int error, eofflag;
if (error = getvnode(p->p_fd, uap->fd, &fp))
return (error);
if ((fp->f_flag & FREAD) == 0)
return (EBADF);
vp = (struct vnode *)fp->f_data;
if (vp->v_type != VDIR)
return (EINVAL);
aiov.iov_base = uap->buf;
aiov.iov_len = 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 = uap->count;
VOP_LOCK(vp);
auio.uio_offset = off = fp->f_offset;
error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag);
fp->f_offset = auio.uio_offset;
VOP_UNLOCK(vp);
if (error)
return (error);
error = copyout((caddr_t)&off, (caddr_t)uap->basep, sizeof(long));
*retval = uap->count - auio.uio_resid;
return (error);
}
/*
* Set the mode mask for creation of filesystem nodes.
*/
mode_t
umask(p, uap, retval)
struct proc *p;
struct args {
int mask;
} *uap;
int *retval;
{
register struct filedesc *fdp = p->p_fd;
*retval = fdp->fd_cmask;
fdp->fd_cmask = uap->mask & 07777;
return (0);
}
/*
* Void all references to file by ripping underlying filesystem
* away from vnode.
*/
/* ARGSUSED */
revoke(p, uap, retval)
struct proc *p;
register struct args {
char *fname;
} *uap;
int *retval;
{
register struct nameidata *ndp;
register struct vnode *vp;
struct vattr vattr;
int error;
struct nameidata nd;
ndp = &nd;
ndp->ni_nameiop = LOOKUP | FOLLOW;
ndp->ni_segflg = UIO_USERSPACE;
ndp->ni_dirp = uap->fname;
if (error = namei(ndp, p))
return (error);
vp = ndp->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))
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.
*/
getvnode(fdp, fdes, fpp)
struct filedesc *fdp;
struct file **fpp;
int fdes;
{
struct file *fp;
if ((unsigned)fdes >= fdp->fd_nfiles ||
(fp = fdp->fd_ofiles[fdes]) == NULL)
return (EBADF);
if (fp->f_type != DTYPE_VNODE)
return (EINVAL);
*fpp = fp;
return (0);
}