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freebsd-skq/sys/kern/vfs_syscalls.c
dg c8b0a7332c NOTE: libkvm, w, ps, 'top', and any other utility which depends on struct 
proc or any VM system structure will have to be rebuilt!!!

Much needed overhaul of the VM system. Included in this first round of
changes:

1) Improved pager interfaces: init, alloc, dealloc, getpages, putpages,
   haspage, and sync operations are supported. The haspage interface now
   provides information about clusterability. All pager routines now take
   struct vm_object's instead of "pagers".

2) Improved data structures. In the previous paradigm, there is constant
   confusion caused by pagers being both a data structure ("allocate a
   pager") and a collection of routines. The idea of a pager structure has
   escentially been eliminated. Objects now have types, and this type is
   used to index the appropriate pager. In most cases, items in the pager
   structure were duplicated in the object data structure and thus were
   unnecessary. In the few cases that remained, a un_pager structure union
   was created in the object to contain these items.

3) Because of the cleanup of #1 & #2, a lot of unnecessary layering can now
   be removed. For instance, vm_object_enter(), vm_object_lookup(),
   vm_object_remove(), and the associated object hash list were some of the
   things that were removed.

4) simple_lock's removed. Discussion with several people reveals that the
   SMP locking primitives used in the VM system aren't likely the mechanism
   that we'll be adopting. Even if it were, the locking that was in the code
   was very inadequate and would have to be mostly re-done anyway. The
   locking in a uni-processor kernel was a no-op but went a long way toward
   making the code difficult to read and debug.

5) Places that attempted to kludge-up the fact that we don't have kernel
   thread support have been fixed to reflect the reality that we are really
   dealing with processes, not threads. The VM system didn't have complete
   thread support, so the comments and mis-named routines were just wrong.
   We now use tsleep and wakeup directly in the lock routines, for instance.

6) Where appropriate, the pagers have been improved, especially in the
   pager_alloc routines. Most of the pager_allocs have been rewritten and
   are now faster and easier to maintain.

7) The pagedaemon pageout clustering algorithm has been rewritten and
   now tries harder to output an even number of pages before and after
   the requested page. This is sort of the reverse of the ideal pagein
   algorithm and should provide better overall performance.

8) Unnecessary (incorrect) casts to caddr_t in calls to tsleep & wakeup
   have been removed. Some other unnecessary casts have also been removed.

9) Some almost useless debugging code removed.

10) Terminology of shadow objects vs. backing objects straightened out.
    The fact that the vm_object data structure escentially had this
    backwards really confused things. The use of "shadow" and "backing
    object" throughout the code is now internally consistent and correct
    in the Mach terminology.

11) Several minor bug fixes, including one in the vm daemon that caused
    0 RSS objects to not get purged as intended.

12) A "default pager" has now been created which cleans up the transition
    of objects to the "swap" type. The previous checks throughout the code
    for swp->pg_data != NULL were really ugly. This change also provides
    the rudiments for future backing of "anonymous" memory by something
    other than the swap pager (via the vnode pager, for example), and it
    allows the decision about which of these pagers to use to be made
    dynamically (although will need some additional decision code to do
    this, of course).

13) (dyson) MAP_COPY has been deprecated and the corresponding "copy
    object" code has been removed. MAP_COPY was undocumented and non-
    standard. It was furthermore broken in several ways which caused its
    behavior to degrade to MAP_PRIVATE. Binaries that use MAP_COPY will
    continue to work correctly, but via the slightly different semantics
    of MAP_PRIVATE.

14) (dyson) Sharing maps have been removed. It's marginal usefulness in a
    threads design can be worked around in other ways. Both #12 and #13
    were done to simplify the code and improve readability and maintain-
    ability. (As were most all of these changes)

TODO:

1) Rewrite most of the vnode pager to use VOP_GETPAGES/PUTPAGES. Doing
   this will reduce the vnode pager to a mere fraction of its current size.

2) Rewrite vm_fault and the swap/vnode pagers to use the clustering
   information provided by the new haspage pager interface. This will
   substantially reduce the overhead by eliminating a large number of
   VOP_BMAP() calls. The VOP_BMAP() filesystem interface should be
   improved to provide both a "behind" and "ahead" indication of
   contiguousness.

3) Implement the extended features of pager_haspage in swap_pager_haspage().
   It currently just says 0 pages ahead/behind.

4) Re-implement the swap device (swstrategy) in a more elegant way, perhaps
   via a much more general mechanism that could also be used for disk
   striping of regular filesystems.

5) Do something to improve the architecture of vm_object_collapse(). The
   fact that it makes calls into the swap pager and knows too much about
   how the swap pager operates really bothers me. It also doesn't allow
   for collapsing of non-swap pager objects ("unnamed" objects backed by
   other pagers).
1995-07-13 08:48:48 +00:00

2256 lines
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/*
* 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 8.13 (Berkeley) 4/15/94
* $Id: vfs_syscalls.c,v 1.27 1995/06/28 12:00:57 davidg Exp $
*/
#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>
#ifdef UNION
#include <miscfs/union/union.h>
#endif
#include <vm/vm.h>
#include <sys/sysctl.h>
static int change_dir __P((struct nameidata *ndp, struct proc *p));
int getvnode __P((struct filedesc *, int, struct file **));
/*
* Virtual File System System Calls
*/
/*
* Mount a file system.
*/
struct mount_args {
int type;
char *path;
int flags;
caddr_t data;
};
/* ARGSUSED */
int
mount(p, uap, retval)
struct proc *p;
register struct mount_args *uap;
int *retval;
{
register struct vnode *vp;
register struct mount *mp;
int error, flag = 0;
struct nameidata nd;
/*
* Must be super user
*/
error = suser(p->p_ucred, &p->p_acflag);
if (error)
return (error);
/*
* Get vnode to be covered
*/
NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, uap->path, p);
error = namei(&nd);
if (error)
return (error);
vp = nd.ni_vp;
if (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 ((uap->flags & MNT_RELOAD) &&
((mp->mnt_flag & MNT_RDONLY) == 0)) {
vput(vp);
return (EOPNOTSUPP); /* Needs translation */
}
mp->mnt_flag |=
uap->flags & (MNT_RELOAD | MNT_FORCE | MNT_UPDATE);
VOP_UNLOCK(vp);
goto update;
}
error = vinvalbuf(vp, V_SAVE, p->p_ucred, p, 0, 0);
if (error)
return (error);
if (vp->v_type != VDIR) {
vput(vp);
return (ENOTDIR);
}
if ((u_long)uap->type > MOUNT_MAXTYPE || vfssw[uap->type] == NULL) {
vput(vp);
return (ENODEV);
}
/*
* 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[uap->type];
mp->mnt_vfc = vfsconf[uap->type];
error = vfs_lock(mp);
if (error) {
free((caddr_t)mp, M_MOUNT);
vput(vp);
return (error);
}
if (vp->v_mountedhere != NULL) {
vfs_unlock(mp);
free((caddr_t)mp, M_MOUNT);
vput(vp);
return (EBUSY);
}
vp->v_mountedhere = mp;
mp->mnt_vnodecovered = vp;
vfsconf[uap->type]->vfc_refcount++;
update:
/*
* Set the mount level flags.
*/
if (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 |= uap->flags & (MNT_NOSUID | MNT_NOEXEC | MNT_NODEV |
MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | MNT_FORCE);
/*
* Mount the filesystem.
*/
error = VFS_MOUNT(mp, uap->path, 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) {
TAILQ_INSERT_TAIL(&mountlist, mp, mnt_list);
VOP_UNLOCK(vp);
vfs_unlock(mp);
error = VFS_START(mp, 0, p);
} else {
mp->mnt_vnodecovered->v_mountedhere = (struct mount *)0;
vfs_unlock(mp);
free((caddr_t)mp, M_MOUNT);
vput(vp);
vfsconf[uap->type]->vfc_refcount--;
}
return (error);
}
/*
* Unmount a file system.
*
* Note: unmount takes a path to the vnode mounted on as argument,
* not special file (as before).
*/
struct unmount_args {
char *path;
int flags;
};
/* ARGSUSED */
int
unmount(p, uap, retval)
struct proc *p;
register struct unmount_args *uap;
int *retval;
{
register struct vnode *vp;
struct mount *mp;
int error;
struct nameidata nd;
NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, uap->path, p);
error = namei(&nd);
if (error)
return (error);
vp = nd.ni_vp;
/*
* Unless this is a user mount, then must
* have suser privilege.
*/
if (((vp->v_mount->mnt_flag & MNT_USER) == 0) &&
(error = suser(p->p_ucred, &p->p_acflag))) {
vput(vp);
return (error);
}
/*
* Must be the root of the filesystem
*/
if ((vp->v_flag & VROOT) == 0) {
vput(vp);
return (EINVAL);
}
mp = vp->v_mount;
vput(vp);
/*
* Don't allow unmount of the root filesystem
*/
if (mp->mnt_flag & MNT_ROOTFS)
return (EINVAL);
return (dounmount(mp, 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;
error = vfs_lock(mp);
if (error)
return (error);
mp->mnt_flag &=~ MNT_ASYNC;
vfs_msync(mp, MNT_NOWAIT);
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 {
vrele(coveredvp);
TAILQ_REMOVE(&mountlist, mp, mnt_list);
mp->mnt_vnodecovered->v_mountedhere = (struct mount *)0;
vfs_unlock(mp);
mp->mnt_vfc->vfc_refcount--;
if (mp->mnt_vnodelist.lh_first != NULL)
panic("unmount: dangling vnode");
free((caddr_t)mp, M_MOUNT);
}
return (error);
}
/*
* Sync each mounted filesystem.
*/
#ifdef DIAGNOSTIC
int syncprt = 0;
struct ctldebug debug0 = { "syncprt", &syncprt };
#endif
/* ARGSUSED */
int
sync(p, uap, retval)
struct proc *p;
struct sync_args *uap;
int *retval;
{
register struct mount *mp;
int asyncflag;
for (mp = mountlist.tqh_first; mp != NULL; mp = mp->mnt_list.tqe_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_msync(mp, MNT_NOWAIT);
VFS_SYNC(mp, MNT_NOWAIT, p != NULL ? p->p_ucred : NOCRED, p);
if (asyncflag)
mp->mnt_flag |= MNT_ASYNC;
vfs_unbusy(mp);
}
}
return (0);
}
/*
* Change filesystem quotas.
*/
struct quotactl_args {
char *path;
int cmd;
int uid;
caddr_t arg;
};
/* ARGSUSED */
int
quotactl(p, uap, retval)
struct proc *p;
register struct quotactl_args *uap;
int *retval;
{
register struct mount *mp;
int error;
struct nameidata nd;
NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, uap->path, p);
error = namei(&nd);
if (error)
return (error);
mp = nd.ni_vp->v_mount;
vrele(nd.ni_vp);
return (VFS_QUOTACTL(mp, uap->cmd, uap->uid, uap->arg, p));
}
/*
* Get filesystem statistics.
*/
struct statfs_args {
char *path;
struct statfs *buf;
};
/* ARGSUSED */
int
statfs(p, uap, retval)
struct proc *p;
register struct statfs_args *uap;
int *retval;
{
register struct mount *mp;
register struct statfs *sp;
int error;
struct nameidata nd;
NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, uap->path, p);
error = namei(&nd);
if (error)
return (error);
mp = nd.ni_vp->v_mount;
sp = &mp->mnt_stat;
vrele(nd.ni_vp);
error = VFS_STATFS(mp, sp, p);
if (error)
return (error);
sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK;
return (copyout((caddr_t)sp, (caddr_t)uap->buf, sizeof(*sp)));
}
/*
* Get filesystem statistics.
*/
struct fstatfs_args {
int fd;
struct statfs *buf;
};
/* ARGSUSED */
int
fstatfs(p, uap, retval)
struct proc *p;
register struct fstatfs_args *uap;
int *retval;
{
struct file *fp;
struct mount *mp;
register struct statfs *sp;
int error;
error = getvnode(p->p_fd, uap->fd, &fp);
if (error)
return (error);
mp = ((struct vnode *)fp->f_data)->v_mount;
sp = &mp->mnt_stat;
error = VFS_STATFS(mp, sp, p);
if (error)
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.
*/
struct getfsstat_args {
struct statfs *buf;
long bufsize;
int flags;
};
int
getfsstat(p, uap, retval)
struct proc *p;
register struct getfsstat_args *uap;
int *retval;
{
register struct mount *mp, *nmp;
register struct statfs *sp;
caddr_t sfsp;
long count, maxcount, error;
maxcount = uap->bufsize / sizeof(struct statfs);
sfsp = (caddr_t)uap->buf;
for (count = 0, mp = mountlist.tqh_first; mp != NULL; mp = nmp) {
nmp = mp->mnt_list.tqe_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 (((uap->flags & MNT_NOWAIT) == 0 ||
(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.
*/
struct fchdir_args {
int fd;
};
/* ARGSUSED */
int
fchdir(p, uap, retval)
struct proc *p;
struct fchdir_args *uap;
int *retval;
{
register struct filedesc *fdp = p->p_fd;
register struct vnode *vp;
struct file *fp;
int error;
error = getvnode(fdp, uap->fd, &fp);
if (error)
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 (``.'').
*/
struct chdir_args {
char *path;
};
/* ARGSUSED */
int
chdir(p, uap, retval)
struct proc *p;
struct chdir_args *uap;
int *retval;
{
register struct filedesc *fdp = p->p_fd;
int error;
struct nameidata nd;
NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, uap->path, p);
error = change_dir(&nd, p);
if (error)
return (error);
vrele(fdp->fd_cdir);
fdp->fd_cdir = nd.ni_vp;
return (0);
}
/*
* Change notion of root (``/'') directory.
*/
struct chroot_args {
char *path;
};
/* ARGSUSED */
int
chroot(p, uap, retval)
struct proc *p;
struct chroot_args *uap;
int *retval;
{
register struct filedesc *fdp = p->p_fd;
int error;
struct nameidata nd;
error = suser(p->p_ucred, &p->p_acflag);
if (error)
return (error);
NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, uap->path, p);
error = change_dir(&nd, p);
if (error)
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;
error = namei(ndp);
if (error)
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.
*/
struct open_args {
char *path;
int flags;
int mode;
};
int
open(p, uap, retval)
struct proc *p;
register struct open_args *uap;
int *retval;
{
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;
error = falloc(p, &nfp, &indx);
if (error)
return (error);
fp = nfp;
flags = FFLAGS(uap->flags);
cmode = ((uap->mode &~ fdp->fd_cmask) & ALLPERMS) &~ S_ISTXT;
NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, uap->path, p);
p->p_dupfd = -indx - 1; /* XXX check for fdopen */
error = vn_open(&nd, flags, cmode);
if (error) {
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);
}
#ifdef COMPAT_43
/*
* Create a file.
*/
struct ocreat_args {
char *path;
int mode;
};
int
ocreat(p, uap, retval)
struct proc *p;
register struct ocreat_args *uap;
int *retval;
{
struct open_args openuap;
openuap.path = uap->path;
openuap.mode = uap->mode;
openuap.flags = O_WRONLY | O_CREAT | O_TRUNC;
return (open(p, &openuap, retval));
}
#endif /* COMPAT_43 */
/*
* Create a special file.
*/
struct mknod_args {
char *path;
int mode;
int dev;
};
/* ARGSUSED */
int
mknod(p, uap, retval)
struct proc *p;
register struct mknod_args *uap;
int *retval;
{
register struct vnode *vp;
struct vattr vattr;
int error;
struct nameidata nd;
error = suser(p->p_ucred, &p->p_acflag);
if (error)
return (error);
NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, uap->path, p);
error = namei(&nd);
if (error)
return (error);
vp = nd.ni_vp;
if (vp != NULL)
error = EEXIST;
else {
VATTR_NULL(&vattr);
vattr.va_mode = (uap->mode & ALLPERMS) &~ p->p_fd->fd_cmask;
vattr.va_rdev = uap->dev;
switch (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;
default:
error = EINVAL;
break;
}
}
if (!error) {
LEASE_CHECK(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE);
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 named pipe.
*/
struct mkfifo_args {
char *path;
int mode;
};
/* ARGSUSED */
int
mkfifo(p, uap, retval)
struct proc *p;
register struct mkfifo_args *uap;
int *retval;
{
struct vattr vattr;
int error;
struct nameidata nd;
NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, uap->path, p);
error = namei(&nd);
if (error)
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 = (uap->mode & ALLPERMS) &~ p->p_fd->fd_cmask;
LEASE_CHECK(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE);
return (VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr));
}
/*
* Make a hard file link.
*/
struct link_args {
char *path;
char *link;
};
/* ARGSUSED */
int
link(p, uap, retval)
struct proc *p;
register struct link_args *uap;
int *retval;
{
register struct vnode *vp;
struct nameidata nd;
int error;
NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, uap->path, p);
error = namei(&nd);
if (error)
return (error);
vp = nd.ni_vp;
if (vp->v_type != VDIR ||
(error = suser(p->p_ucred, &p->p_acflag)) == 0) {
nd.ni_cnd.cn_nameiop = CREATE;
nd.ni_cnd.cn_flags = LOCKPARENT;
nd.ni_dirp = uap->link;
error = namei(&nd);
if (!error) {
if (nd.ni_vp != NULL)
error = EEXIST;
if (!error) {
LEASE_CHECK(nd.ni_dvp,
p, p->p_ucred, LEASE_WRITE);
LEASE_CHECK(vp,
p, p->p_ucred, LEASE_WRITE);
error = VOP_LINK(vp, nd.ni_dvp, &nd.ni_cnd);
} else {
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);
}
}
}
vrele(vp);
return (error);
}
/*
* Make a symbolic link.
*/
struct symlink_args {
char *path;
char *link;
};
/* ARGSUSED */
int
symlink(p, uap, retval)
struct proc *p;
register struct symlink_args *uap;
int *retval;
{
struct vattr vattr;
char *path;
int error;
struct nameidata nd;
MALLOC(path, char *, MAXPATHLEN, M_NAMEI, M_WAITOK);
error = copyinstr(uap->path, path, MAXPATHLEN, NULL);
if (error)
goto out;
NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, uap->link, p);
error = namei(&nd);
if (error)
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;
LEASE_CHECK(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 name from the filesystem.
*/
struct unlink_args {
char *path;
};
/* ARGSUSED */
int
unlink(p, uap, retval)
struct proc *p;
struct unlink_args *uap;
int *retval;
{
register struct vnode *vp;
int error;
struct nameidata nd;
NDINIT(&nd, DELETE, LOCKPARENT, UIO_USERSPACE, uap->path, p);
error = namei(&nd);
if (error)
return (error);
vp = nd.ni_vp;
LEASE_CHECK(vp, p, p->p_ucred, LEASE_WRITE);
VOP_LOCK(vp);
if (vp->v_type != VDIR ||
(error = suser(p->p_ucred, &p->p_acflag)) == 0) {
/*
* The root of a mounted filesystem cannot be deleted.
*/
if (vp->v_flag & VROOT)
error = EBUSY;
else
(void) vnode_pager_uncache(vp);
}
if (!error) {
LEASE_CHECK(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE);
error = VOP_REMOVE(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);
}
/*
* Reposition read/write file offset.
*/
struct lseek_args {
int fd;
int pad;
off_t offset;
int whence;
};
int
lseek(p, uap, retval)
struct proc *p;
register struct lseek_args *uap;
int *retval;
{
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)uap->fd >= fdp->fd_nfiles ||
(fp = fdp->fd_ofiles[uap->fd]) == NULL)
return (EBADF);
if (fp->f_type != DTYPE_VNODE)
return (ESPIPE);
switch (uap->whence) {
case L_INCR:
fp->f_offset += uap->offset;
break;
case L_XTND:
error=VOP_GETATTR((struct vnode *)fp->f_data, &vattr, cred, p);
if (error)
return (error);
fp->f_offset = uap->offset + vattr.va_size;
break;
case L_SET:
fp->f_offset = uap->offset;
break;
default:
return (EINVAL);
}
*(off_t *)retval = fp->f_offset;
return (0);
}
#if defined(COMPAT_43) || defined(COMPAT_SUNOS)
/*
* Reposition read/write file offset.
*/
struct olseek_args {
int fd;
long offset;
int whence;
};
int
olseek(p, uap, retval)
struct proc *p;
register struct olseek_args *uap;
int *retval;
{
struct lseek_args nuap;
off_t qret;
int error;
nuap.fd = uap->fd;
nuap.offset = uap->offset;
nuap.whence = uap->whence;
error = lseek(p, &nuap, &qret);
*(long *)retval = qret;
return (error);
}
#endif /* COMPAT_43 */
/*
* Check access permissions.
*/
struct access_args {
char *path;
int flags;
};
int
access(p, uap, retval)
struct proc *p;
register struct access_args *uap;
int *retval;
{
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_groups[0];
cred->cr_uid = p->p_cred->p_ruid;
cred->cr_groups[0] = p->p_cred->p_rgid;
NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, uap->path, p);
error = namei(&nd);
if (error)
goto out1;
vp = nd.ni_vp;
/* Flags == 0 means only check for existence. */
if (uap->flags) {
flags = 0;
if (uap->flags & R_OK)
flags |= VREAD;
if (uap->flags & W_OK)
flags |= VWRITE;
if (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_groups[0] = t_gid;
return (error);
}
#if defined(COMPAT_43) || defined(COMPAT_SUNOS)
/*
* Get file status; this version follows links.
*/
struct ostat_args {
char *path;
struct ostat *ub;
};
/* ARGSUSED */
int
ostat(p, uap, retval)
struct proc *p;
register struct ostat_args *uap;
int *retval;
{
struct stat sb;
struct ostat osb;
int error;
struct nameidata nd;
NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, uap->path, p);
error = namei(&nd);
if (error)
return (error);
error = vn_stat(nd.ni_vp, &sb, p);
vput(nd.ni_vp);
if (error)
return (error);
cvtstat(&sb, &osb);
error = copyout((caddr_t)&osb, (caddr_t)uap->ub, sizeof (osb));
return (error);
}
/*
* Get file status; this version does not follow links.
*/
struct olstat_args {
char *path;
struct ostat *ub;
};
/* ARGSUSED */
int
olstat(p, uap, retval)
struct proc *p;
register struct olstat_args *uap;
int *retval;
{
struct vnode *vp, *dvp;
struct stat sb, sb1;
struct ostat osb;
int error;
struct nameidata nd;
NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF | LOCKPARENT, UIO_USERSPACE,
uap->path, p);
error = namei(&nd);
if (error)
return (error);
/*
* For symbolic links, always return the attributes of its
* containing directory, except for mode, size, and links.
*/
vp = nd.ni_vp;
dvp = nd.ni_dvp;
if (vp->v_type != VLNK) {
if (dvp == vp)
vrele(dvp);
else
vput(dvp);
error = vn_stat(vp, &sb, p);
vput(vp);
if (error)
return (error);
} else {
error = vn_stat(dvp, &sb, p);
vput(dvp);
if (error) {
vput(vp);
return (error);
}
error = vn_stat(vp, &sb1, p);
vput(vp);
if (error)
return (error);
sb.st_mode &= ~S_IFDIR;
sb.st_mode |= S_IFLNK;
sb.st_nlink = sb1.st_nlink;
sb.st_size = sb1.st_size;
sb.st_blocks = sb1.st_blocks;
}
cvtstat(&sb, &osb);
error = copyout((caddr_t)&osb, (caddr_t)uap->ub, sizeof (osb));
return (error);
}
/*
* Convert from an old to a new stat structure.
*/
void
cvtstat(st, ost)
struct stat *st;
struct ostat *ost;
{
ost->st_dev = st->st_dev;
ost->st_ino = st->st_ino;
ost->st_mode = st->st_mode;
ost->st_nlink = st->st_nlink;
ost->st_uid = st->st_uid;
ost->st_gid = st->st_gid;
ost->st_rdev = st->st_rdev;
if (st->st_size < (quad_t)1 << 32)
ost->st_size = st->st_size;
else
ost->st_size = -2;
ost->st_atime = st->st_atime;
ost->st_mtime = st->st_mtime;
ost->st_ctime = st->st_ctime;
ost->st_blksize = st->st_blksize;
ost->st_blocks = st->st_blocks;
ost->st_flags = st->st_flags;
ost->st_gen = st->st_gen;
}
#endif /* COMPAT_43 || COMPAT_SUNOS */
/*
* Get file status; this version follows links.
*/
struct stat_args {
char *path;
struct stat *ub;
};
/* ARGSUSED */
int
stat(p, uap, retval)
struct proc *p;
register struct stat_args *uap;
int *retval;
{
struct stat sb;
int error;
struct nameidata nd;
NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, uap->path, p);
error = namei(&nd);
if (error)
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)uap->ub, sizeof (sb));
return (error);
}
/*
* Get file status; this version does not follow links.
*/
struct lstat_args {
char *path;
struct stat *ub;
};
/* ARGSUSED */
int
lstat(p, uap, retval)
struct proc *p;
register struct lstat_args *uap;
int *retval;
{
int error;
struct vnode *vp, *dvp;
struct stat sb, sb1;
struct nameidata nd;
NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF | LOCKPARENT, UIO_USERSPACE,
uap->path, p);
error = namei(&nd);
if (error)
return (error);
/*
* For symbolic links, always return the attributes of its
* containing directory, except for mode, size, and links.
*/
vp = nd.ni_vp;
dvp = nd.ni_dvp;
if (vp->v_type != VLNK) {
if (dvp == vp)
vrele(dvp);
else
vput(dvp);
error = vn_stat(vp, &sb, p);
vput(vp);
if (error)
return (error);
} else {
error = vn_stat(dvp, &sb, p);
vput(dvp);
if (error) {
vput(vp);
return (error);
}
error = vn_stat(vp, &sb1, p);
vput(vp);
if (error)
return (error);
sb.st_mode &= ~S_IFDIR;
sb.st_mode |= S_IFLNK;
sb.st_nlink = sb1.st_nlink;
sb.st_size = sb1.st_size;
sb.st_blocks = sb1.st_blocks;
}
error = copyout((caddr_t)&sb, (caddr_t)uap->ub, sizeof (sb));
return (error);
}
/*
* Get configurable pathname variables.
*/
struct pathconf_args {
char *path;
int name;
};
/* ARGSUSED */
int
pathconf(p, uap, retval)
struct proc *p;
register struct pathconf_args *uap;
int *retval;
{
int error;
struct nameidata nd;
NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, uap->path, p);
error = namei(&nd);
if (error)
return (error);
error = VOP_PATHCONF(nd.ni_vp, uap->name, retval);
vput(nd.ni_vp);
return (error);
}
/*
* Return target name of a symbolic link.
*/
struct readlink_args {
char *path;
char *buf;
int count;
};
/* ARGSUSED */
int
readlink(p, uap, retval)
struct proc *p;
register struct readlink_args *uap;
int *retval;
{
register struct vnode *vp;
struct iovec aiov;
struct uio auio;
int error;
struct nameidata nd;
NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF, UIO_USERSPACE, uap->path, p);
error = namei(&nd);
if (error)
return (error);
vp = nd.ni_vp;
if (vp->v_type != VLNK)
error = EINVAL;
else {
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);
}
vput(vp);
*retval = uap->count - auio.uio_resid;
return (error);
}
/*
* Change flags of a file given a path name.
*/
struct chflags_args {
char *path;
int flags;
};
/* ARGSUSED */
int
chflags(p, uap, retval)
struct proc *p;
register struct chflags_args *uap;
int *retval;
{
register struct vnode *vp;
struct vattr vattr;
int error;
struct nameidata nd;
NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, uap->path, p);
error = namei(&nd);
if (error)
return (error);
vp = nd.ni_vp;
LEASE_CHECK(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 = uap->flags;
error = VOP_SETATTR(vp, &vattr, p->p_ucred, p);
}
vput(vp);
return (error);
}
/*
* Change flags of a file given a file descriptor.
*/
struct fchflags_args {
int fd;
int flags;
};
/* ARGSUSED */
int
fchflags(p, uap, retval)
struct proc *p;
register struct fchflags_args *uap;
int *retval;
{
struct vattr vattr;
struct vnode *vp;
struct file *fp;
int error;
error = getvnode(p->p_fd, uap->fd, &fp);
if (error)
return (error);
vp = (struct vnode *)fp->f_data;
LEASE_CHECK(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 = uap->flags;
error = VOP_SETATTR(vp, &vattr, p->p_ucred, p);
}
VOP_UNLOCK(vp);
return (error);
}
/*
* Change mode of a file given path name.
*/
struct chmod_args {
char *path;
int mode;
};
/* ARGSUSED */
int
chmod(p, uap, retval)
struct proc *p;
register struct chmod_args *uap;
int *retval;
{
register struct vnode *vp;
struct vattr vattr;
int error;
struct nameidata nd;
NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, uap->path, p);
error = namei(&nd);
if (error)
return (error);
vp = nd.ni_vp;
LEASE_CHECK(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 = 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.
*/
struct fchmod_args {
int fd;
int mode;
};
/* ARGSUSED */
int
fchmod(p, uap, retval)
struct proc *p;
register struct fchmod_args *uap;
int *retval;
{
struct vattr vattr;
struct vnode *vp;
struct file *fp;
int error;
error = getvnode(p->p_fd, uap->fd, &fp);
if (error)
return (error);
vp = (struct vnode *)fp->f_data;
LEASE_CHECK(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 = uap->mode & ALLPERMS;
error = VOP_SETATTR(vp, &vattr, p->p_ucred, p);
}
VOP_UNLOCK(vp);
return (error);
}
/*
* Set ownership given a path name.
*/
struct chown_args {
char *path;
int uid;
int gid;
};
/* ARGSUSED */
int
chown(p, uap, retval)
struct proc *p;
register struct chown_args *uap;
int *retval;
{
register struct vnode *vp;
struct vattr vattr;
int error;
struct nameidata nd;
NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, uap->path, p);
error = namei(&nd);
if (error)
return (error);
vp = nd.ni_vp;
LEASE_CHECK(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 = uap->uid;
vattr.va_gid = uap->gid;
error = VOP_SETATTR(vp, &vattr, p->p_ucred, p);
}
vput(vp);
return (error);
}
/*
* Set ownership given a file descriptor.
*/
struct fchown_args {
int fd;
int uid;
int gid;
};
/* ARGSUSED */
int
fchown(p, uap, retval)
struct proc *p;
register struct fchown_args *uap;
int *retval;
{
struct vattr vattr;
struct vnode *vp;
struct file *fp;
int error;
error = getvnode(p->p_fd, uap->fd, &fp);
if (error)
return (error);
vp = (struct vnode *)fp->f_data;
LEASE_CHECK(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 = uap->uid;
vattr.va_gid = uap->gid;
error = VOP_SETATTR(vp, &vattr, p->p_ucred, p);
}
VOP_UNLOCK(vp);
return (error);
}
/*
* Set the access and modification times of a file.
*/
struct utimes_args {
char *path;
struct timeval *tptr;
};
/* ARGSUSED */
int
utimes(p, uap, retval)
struct proc *p;
register struct utimes_args *uap;
int *retval;
{
register struct vnode *vp;
struct timeval tv[2];
struct vattr vattr;
int error;
struct nameidata nd;
VATTR_NULL(&vattr);
if (uap->tptr == NULL) {
microtime(&tv[0]);
tv[1] = tv[0];
vattr.va_vaflags |= VA_UTIMES_NULL;
} else {
error = copyin((caddr_t)uap->tptr, (caddr_t)tv, sizeof (tv));
if (error)
return (error);
}
NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, uap->path, p);
error = namei(&nd);
if (error)
return (error);
vp = nd.ni_vp;
LEASE_CHECK(vp, p, p->p_ucred, LEASE_WRITE);
VOP_LOCK(vp);
if (vp->v_mount->mnt_flag & MNT_RDONLY)
error = EROFS;
else {
vattr.va_atime.ts_sec = tv[0].tv_sec;
vattr.va_atime.ts_nsec = tv[0].tv_usec * 1000;
vattr.va_mtime.ts_sec = tv[1].tv_sec;
vattr.va_mtime.ts_nsec = tv[1].tv_usec * 1000;
error = VOP_SETATTR(vp, &vattr, p->p_ucred, p);
}
vput(vp);
return (error);
}
/*
* Truncate a file given its path name.
*/
struct truncate_args {
char *path;
int pad;
off_t length;
};
/* ARGSUSED */
int
truncate(p, uap, retval)
struct proc *p;
register struct truncate_args *uap;
int *retval;
{
register struct vnode *vp;
struct vattr vattr;
int error;
struct nameidata nd;
if (uap->length < 0)
return(EINVAL);
NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, uap->path, p);
error = namei(&nd);
if (error)
return (error);
vp = nd.ni_vp;
LEASE_CHECK(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 = uap->length;
error = VOP_SETATTR(vp, &vattr, p->p_ucred, p);
}
vput(vp);
return (error);
}
/*
* Truncate a file given a file descriptor.
*/
struct ftruncate_args {
int fd;
int pad;
off_t length;
};
/* ARGSUSED */
int
ftruncate(p, uap, retval)
struct proc *p;
register struct ftruncate_args *uap;
int *retval;
{
struct vattr vattr;
struct vnode *vp;
struct file *fp;
int error;
if (uap->length < 0)
return(EINVAL);
error = getvnode(p->p_fd, uap->fd, &fp);
if (error)
return (error);
if ((fp->f_flag & FWRITE) == 0)
return (EINVAL);
vp = (struct vnode *)fp->f_data;
LEASE_CHECK(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 = uap->length;
error = VOP_SETATTR(vp, &vattr, fp->f_cred, p);
}
VOP_UNLOCK(vp);
return (error);
}
#if defined(COMPAT_43) || defined(COMPAT_SUNOS)
/*
* Truncate a file given its path name.
*/
struct otruncate_args {
char *path;
long length;
};
/* ARGSUSED */
int
otruncate(p, uap, retval)
struct proc *p;
register struct otruncate_args *uap;
int *retval;
{
struct truncate_args nuap;
nuap.path = uap->path;
nuap.length = uap->length;
return (truncate(p, &nuap, retval));
}
/*
* Truncate a file given a file descriptor.
*/
struct oftruncate_args {
int fd;
long length;
};
/* ARGSUSED */
int
oftruncate(p, uap, retval)
struct proc *p;
register struct oftruncate_args *uap;
int *retval;
{
struct ftruncate_args nuap;
nuap.fd = uap->fd;
nuap.length = uap->length;
return (ftruncate(p, &nuap, retval));
}
#endif /* COMPAT_43 || COMPAT_SUNOS */
/*
* Sync an open file.
*/
struct fsync_args {
int fd;
};
/* ARGSUSED */
int
fsync(p, uap, retval)
struct proc *p;
struct fsync_args *uap;
int *retval;
{
register struct vnode *vp;
struct file *fp;
int error;
error = getvnode(p->p_fd, uap->fd, &fp);
if (error)
return (error);
vp = (struct vnode *)fp->f_data;
VOP_LOCK(vp);
if (vp->v_object) {
vm_object_page_clean(vp->v_object, 0, 0 ,0, FALSE);
}
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.
*/
struct rename_args {
char *from;
char *to;
};
/* ARGSUSED */
int
rename(p, uap, retval)
struct proc *p;
register struct rename_args *uap;
int *retval;
{
register struct vnode *tvp, *fvp, *tdvp;
struct nameidata fromnd, tond;
int error;
NDINIT(&fromnd, DELETE, WANTPARENT | SAVESTART, UIO_USERSPACE,
uap->from, p);
error = namei(&fromnd);
if (error)
return (error);
fvp = fromnd.ni_vp;
NDINIT(&tond, RENAME, LOCKPARENT | LOCKLEAF | NOCACHE | SAVESTART,
UIO_USERSPACE, uap->to, p);
error = namei(&tond);
if (error) {
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) {
LEASE_CHECK(tdvp, p, p->p_ucred, LEASE_WRITE);
if (fromnd.ni_dvp != tdvp) {
LEASE_CHECK(fromnd.ni_dvp, p, p->p_ucred, LEASE_WRITE);
}
if (tvp) {
LEASE_CHECK(tvp, p, p->p_ucred, LEASE_WRITE);
(void) vnode_pager_uncache(tvp);
}
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.
*/
struct mkdir_args {
char *path;
int mode;
};
/* ARGSUSED */
int
mkdir(p, uap, retval)
struct proc *p;
register struct mkdir_args *uap;
int *retval;
{
register struct vnode *vp;
struct vattr vattr;
int error;
struct nameidata nd;
NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, uap->path, p);
error = namei(&nd);
if (error)
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 = (uap->mode & ACCESSPERMS) &~ p->p_fd->fd_cmask;
LEASE_CHECK(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.
*/
struct rmdir_args {
char *path;
};
/* ARGSUSED */
int
rmdir(p, uap, retval)
struct proc *p;
struct rmdir_args *uap;
int *retval;
{
register struct vnode *vp;
int error;
struct nameidata nd;
NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF, UIO_USERSPACE, uap->path, p);
error = namei(&nd);
if (error)
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) {
LEASE_CHECK(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE);
LEASE_CHECK(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);
}
#ifdef COMPAT_43
/*
* Read a block of directory entries in a file system independent format.
*/
struct ogetdirentries_args {
int fd;
char *buf;
u_int count;
long *basep;
};
int
ogetdirentries(p, uap, retval)
struct proc *p;
register struct ogetdirentries_args *uap;
int *retval;
{
register struct vnode *vp;
struct file *fp;
struct uio auio, kuio;
struct iovec aiov, kiov;
struct dirent *dp, *edp;
caddr_t dirbuf;
int error, readcnt;
long loff;
error = getvnode(p->p_fd, uap->fd, &fp);
if (error)
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);
loff = auio.uio_offset = fp->f_offset;
# if (BYTE_ORDER != LITTLE_ENDIAN)
if (vp->v_mount->mnt_maxsymlinklen <= 0) {
error = VOP_READDIR(vp, &auio, fp->f_cred, NULL, NULL, NULL);
fp->f_offset = auio.uio_offset;
} else
# endif
{
kuio = auio;
kuio.uio_iov = &kiov;
kuio.uio_segflg = UIO_SYSSPACE;
kiov.iov_len = uap->count;
MALLOC(dirbuf, caddr_t, uap->count, M_TEMP, M_WAITOK);
kiov.iov_base = dirbuf;
error = VOP_READDIR(vp, &kuio, fp->f_cred, NULL, NULL, NULL);
fp->f_offset = kuio.uio_offset;
if (error == 0) {
readcnt = uap->count - kuio.uio_resid;
edp = (struct dirent *)&dirbuf[readcnt];
for (dp = (struct dirent *)dirbuf; dp < edp; ) {
# if (BYTE_ORDER == LITTLE_ENDIAN)
/*
* The expected low byte of
* dp->d_namlen is our dp->d_type.
* The high MBZ byte of dp->d_namlen
* is our dp->d_namlen.
*/
dp->d_type = dp->d_namlen;
dp->d_namlen = 0;
# else
/*
* The dp->d_type is the high byte
* of the expected dp->d_namlen,
* so must be zero'ed.
*/
dp->d_type = 0;
# endif
if (dp->d_reclen > 0) {
dp = (struct dirent *)
((char *)dp + dp->d_reclen);
} else {
error = EIO;
break;
}
}
if (dp >= edp)
error = uiomove(dirbuf, readcnt, &auio);
}
FREE(dirbuf, M_TEMP);
}
VOP_UNLOCK(vp);
if (error)
return (error);
error = copyout((caddr_t)&loff, (caddr_t)uap->basep, sizeof(long));
*retval = uap->count - auio.uio_resid;
return (error);
}
#endif
/*
* Read a block of directory entries in a file system independent format.
*/
struct getdirentries_args {
int fd;
char *buf;
u_int count;
long *basep;
};
int
getdirentries(p, uap, retval)
struct proc *p;
register struct getdirentries_args *uap;
int *retval;
{
register struct vnode *vp;
struct file *fp;
struct uio auio;
struct iovec aiov;
long loff;
int error;
error = getvnode(p->p_fd, uap->fd, &fp);
if (error)
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 = 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);
loff = auio.uio_offset = fp->f_offset;
error = VOP_READDIR(vp, &auio, fp->f_cred, NULL, NULL, NULL);
fp->f_offset = auio.uio_offset;
VOP_UNLOCK(vp);
if (error)
return (error);
#ifdef UNION
{
if ((uap->count == auio.uio_resid) &&
(vp->v_op == union_vnodeop_p)) {
struct vnode *tvp = vp;
vp = union_lowervp(vp);
if (vp != NULLVP) {
VOP_LOCK(vp);
error = VOP_OPEN(vp, FREAD);
VOP_UNLOCK(vp);
if (error) {
vrele(vp);
return (error);
}
fp->f_data = (caddr_t) vp;
fp->f_offset = 0;
error = vn_close(tvp, FREAD, fp->f_cred, p);
if (error)
return (error);
goto unionread;
}
}
}
#endif
if ((uap->count == auio.uio_resid) &&
vp &&
(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)uap->basep, sizeof(long));
*retval = uap->count - auio.uio_resid;
return (error);
}
/*
* Set the mode mask for creation of filesystem nodes.
*/
struct umask_args {
int newmask;
};
mode_t /* XXX */
umask(p, uap, retval)
struct proc *p;
struct umask_args *uap;
int *retval;
{
register struct filedesc *fdp;
fdp = p->p_fd;
*retval = fdp->fd_cmask;
fdp->fd_cmask = uap->newmask & ALLPERMS;
return (0);
}
/*
* Void all references to file by ripping underlying filesystem
* away from vnode.
*/
struct revoke_args {
char *path;
};
/* ARGSUSED */
int
revoke(p, uap, retval)
struct proc *p;
register struct revoke_args *uap;
int *retval;
{
register struct vnode *vp;
struct vattr vattr;
int error;
struct nameidata nd;
NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, uap->path, p);
error = namei(&nd);
if (error)
return (error);
vp = nd.ni_vp;
if (vp->v_type != VCHR && vp->v_type != VBLK) {
error = EINVAL;
goto out;
}
error = VOP_GETATTR(vp, &vattr, p->p_ucred, p);
if (error)
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;
struct file **fpp;
int fd;
{
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);
*fpp = fp;
return (0);
}
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