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NetBSD/sys/kern/vfs_syscalls.c
kleink 661f76699f POSIX: when attempting to fdatasync(2) a file which is not open for 
writing, fail with EBADF.
2003-10-25 01:18:01 +00:00

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/* $NetBSD: vfs_syscalls.c,v 1.199 2003/10/25 01:18:01 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. 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 8.42 (Berkeley) 7/31/95
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: vfs_syscalls.c,v 1.199 2003/10/25 01:18:01 kleink Exp $");
#include "opt_compat_netbsd.h"
#include "opt_compat_43.h"
#include "opt_ktrace.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/sysctl.h>
#include <sys/sa.h>
#include <sys/syscallargs.h>
#ifdef KTRACE
#include <sys/ktrace.h>
#endif
#include <miscfs/genfs/genfs.h>
#include <miscfs/syncfs/syncfs.h>
MALLOC_DEFINE(M_MOUNT, "mount", "vfs mount struct");
static int change_dir __P((struct nameidata *, struct proc *));
static int change_flags __P((struct vnode *, u_long, 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));
static int dostatfs __P((struct mount *, struct statfs *, struct proc *, int,
int));
void checkdirs __P((struct vnode *));
int dovfsusermount = 0;
/*
* 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!
*
* Do not modify this table. It should only contain filesystems
* supported by NetBSD 0.9 and 4.3BSD.
*/
const char * const mountcompatnames[] = {
NULL, /* 0 = MOUNT_NONE */
MOUNT_FFS, /* 1 = MOUNT_UFS */
MOUNT_NFS, /* 2 */
MOUNT_MFS, /* 3 */
MOUNT_MSDOS, /* 4 */
MOUNT_CD9660, /* 5 = MOUNT_ISOFS */
MOUNT_FDESC, /* 6 */
MOUNT_KERNFS, /* 7 */
NULL, /* 8 = MOUNT_DEVFS */
MOUNT_AFS, /* 9 */
};
const int nmountcompatnames = sizeof(mountcompatnames) /
sizeof(mountcompatnames[0]);
#endif /* COMPAT_09 || COMPAT_43 */
/* ARGSUSED */
int
sys_mount(l, v, retval)
struct lwp *l;
void *v;
register_t *retval;
{
struct sys_mount_args /* {
syscallarg(const char *) type;
syscallarg(const char *) path;
syscallarg(int) flags;
syscallarg(void *) data;
} */ *uap = v;
struct proc *p = l->l_proc;
struct vnode *vp;
struct mount *mp;
int error, flag = 0;
char fstypename[MFSNAMELEN];
struct vattr va;
struct nameidata nd;
struct vfsops *vfs;
if (dovfsusermount == 0 && (SCARG(uap, flags) & MNT_GETARGS) == 0 &&
(error = suser(p->p_ucred, &p->p_acflag)))
return (error);
/*
* Get vnode to be covered
*/
NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE,
SCARG(uap, path), p);
if ((error = namei(&nd)) != 0)
return (error);
vp = nd.ni_vp;
/*
* A lookup in VFS_MOUNT might result in an attempt to
* lock this vnode again, so make the lock recursive.
*/
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY | LK_SETRECURSE);
if (SCARG(uap, flags) & (MNT_UPDATE | MNT_GETARGS)) {
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 */
}
/*
* In "highly secure" mode, don't let the caller do anything
* but downgrade a filesystem from read-write to read-only.
* (see also below; MNT_UPDATE or MNT_GETARGS is required.)
*/
if (securelevel >= 2 &&
SCARG(uap, flags) != MNT_GETARGS &&
SCARG(uap, flags) !=
(mp->mnt_flag | MNT_RDONLY |
MNT_RELOAD | MNT_FORCE | MNT_UPDATE)) {
vput(vp);
return (EPERM);
}
mp->mnt_flag |= SCARG(uap, flags) &
(MNT_RELOAD | MNT_FORCE | MNT_UPDATE | MNT_GETARGS);
/*
* Only root, or the user that did the original mount is
* permitted to update it.
*/
if ((mp->mnt_flag & MNT_GETARGS) == 0 &&
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. For non-root
* users, silently enforce MNT_NOSUID and MNT_NODEV, and
* MNT_NOEXEC if mount point is already MNT_NOEXEC.
*/
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 (flag & MNT_NOEXEC)
SCARG(uap, flags) |= MNT_NOEXEC;
}
if (vfs_busy(mp, LK_NOWAIT, 0)) {
vput(vp);
return (EPERM);
}
goto update;
} else {
if (securelevel >= 2) {
vput(vp);
return (EPERM);
}
}
/*
* 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. For non-root users,
* silently enforce MNT_NOSUID and MNT_NODEV, and MNT_NOEXEC if the
* mount point is already MNT_NOEXEC.
*/
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 (vp->v_mount->mnt_flag & MNT_NOEXEC)
SCARG(uap, flags) |= MNT_NOEXEC;
}
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);
memset((char *)mp, 0, (u_long)sizeof(struct mount));
lockinit(&mp->mnt_lock, PVFS, "vfslock", 0, 0);
(void)vfs_busy(mp, LK_NOWAIT, 0);
mp->mnt_op = vfs;
vfs->vfs_refcount++;
mp->mnt_vnodecovered = vp;
mp->mnt_stat.f_owner = p->p_ucred->cr_uid;
mp->mnt_unmounter = NULL;
/*
* The underlying file system may refuse the mount for
* various reasons. Allow the user to force it to happen.
*/
mp->mnt_flag |= SCARG(uap, flags) & MNT_FORCE;
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_iflag |= IMNT_WANTRDWR;
mp->mnt_flag &=
~(MNT_NOSUID | MNT_NOEXEC | MNT_NODEV |
MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | MNT_NOCOREDUMP |
MNT_NOATIME | MNT_NODEVMTIME | MNT_SYMPERM | MNT_SOFTDEP);
mp->mnt_flag |= SCARG(uap, flags) &
(MNT_NOSUID | MNT_NOEXEC | MNT_NODEV |
MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | MNT_NOCOREDUMP |
MNT_NOATIME | MNT_NODEVMTIME | MNT_SYMPERM | MNT_SOFTDEP |
MNT_IGNORE);
/*
* Mount the filesystem.
*/
error = VFS_MOUNT(mp, SCARG(uap, path), SCARG(uap, data), &nd, p);
if (mp->mnt_flag & (MNT_UPDATE | MNT_GETARGS)) {
if (mp->mnt_iflag & IMNT_WANTRDWR)
mp->mnt_flag &= ~MNT_RDONLY;
if (error || (mp->mnt_flag & MNT_GETARGS))
mp->mnt_flag = flag;
mp->mnt_flag &=~
(MNT_RELOAD | MNT_FORCE | MNT_UPDATE | MNT_GETARGS);
mp->mnt_iflag &=~ IMNT_WANTRDWR;
if ((mp->mnt_flag & (MNT_RDONLY | MNT_ASYNC)) == 0) {
if (mp->mnt_syncer == NULL)
error = vfs_allocate_syncvnode(mp);
} else {
if (mp->mnt_syncer != NULL)
vfs_deallocate_syncvnode(mp);
}
vfs_unbusy(mp);
VOP_UNLOCK(vp, 0);
vrele(vp);
return (error);
}
/*
* Put the new filesystem on the mount list after root.
*/
cache_purge(vp);
if (!error) {
mp->mnt_flag &=~
(MNT_RELOAD | MNT_FORCE | MNT_UPDATE | MNT_GETARGS);
mp->mnt_iflag &=~ IMNT_WANTRDWR;
vp->v_mountedhere = mp;
simple_lock(&mountlist_slock);
CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list);
simple_unlock(&mountlist_slock);
checkdirs(vp);
VOP_UNLOCK(vp, 0);
if ((mp->mnt_flag & (MNT_RDONLY | MNT_ASYNC)) == 0)
error = vfs_allocate_syncvnode(mp);
vfs_unbusy(mp);
(void) VFS_STATFS(mp, &mp->mnt_stat, p);
if ((error = VFS_START(mp, 0, p)))
vrele(vp);
} else {
vp->v_mountedhere = (struct mount *)0;
vfs->vfs_refcount--;
vfs_unbusy(mp);
free(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 cwdinfo *cwdi;
struct vnode *newdp;
struct proc *p;
if (olddp->v_usecount == 1)
return;
if (VFS_ROOT(olddp->v_mountedhere, &newdp))
panic("mount: lost mount");
proclist_lock_read();
LIST_FOREACH(p, &allproc, p_list) {
cwdi = p->p_cwdi;
if (cwdi->cwdi_cdir == olddp) {
vrele(cwdi->cwdi_cdir);
VREF(newdp);
cwdi->cwdi_cdir = newdp;
}
if (cwdi->cwdi_rdir == olddp) {
vrele(cwdi->cwdi_rdir);
VREF(newdp);
cwdi->cwdi_rdir = newdp;
}
}
proclist_unlock_read();
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(l, v, retval)
struct lwp *l;
void *v;
register_t *retval;
{
struct sys_unmount_args /* {
syscallarg(const char *) path;
syscallarg(int) flags;
} */ *uap = v;
struct proc *p = l->l_proc;
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);
/*
* XXX Freeze syncer. Must do this before locking the
* mount point. See dounmount() for details.
*/
lockmgr(&syncer_lock, LK_EXCLUSIVE, NULL);
if (vfs_busy(mp, 0, 0)) {
lockmgr(&syncer_lock, LK_RELEASE, NULL);
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)
struct mount *mp;
int flags;
struct proc *p;
{
struct vnode *coveredvp;
int error;
int async;
int used_syncer;
simple_lock(&mountlist_slock);
vfs_unbusy(mp);
used_syncer = (mp->mnt_syncer != NULL);
/*
* XXX Syncer must be frozen when we get here. This should really
* be done on a per-mountpoint basis, but especially the softdep
* code possibly called from the syncer doens't exactly work on a
* per-mountpoint basis, so the softdep code would become a maze
* of vfs_busy() calls.
*
* The caller of dounmount() must acquire syncer_lock because
* the syncer itself acquires locks in syncer_lock -> vfs_busy
* order, and we must preserve that order to avoid deadlock.
*
* So, if the file system did not use the syncer, now is
* the time to release the syncer_lock.
*/
if (used_syncer == 0)
lockmgr(&syncer_lock, LK_RELEASE, NULL);
mp->mnt_iflag |= IMNT_UNMOUNT;
mp->mnt_unmounter = p;
lockmgr(&mp->mnt_lock, LK_DRAIN | LK_INTERLOCK, &mountlist_slock);
vn_start_write(NULL, &mp, V_WAIT);
if (mp->mnt_flag & MNT_EXPUBLIC)
vfs_setpublicfs(NULL, NULL, NULL);
async = mp->mnt_flag & MNT_ASYNC;
mp->mnt_flag &= ~MNT_ASYNC;
cache_purgevfs(mp); /* remove cache entries for this file sys */
if (mp->mnt_syncer != NULL)
vfs_deallocate_syncvnode(mp);
if (((mp->mnt_flag & MNT_RDONLY) ||
(error = VFS_SYNC(mp, MNT_WAIT, p->p_ucred, p)) == 0) ||
(flags & MNT_FORCE))
error = VFS_UNMOUNT(mp, flags, p);
vn_finished_write(mp, 0);
simple_lock(&mountlist_slock);
if (error) {
if ((mp->mnt_flag & (MNT_RDONLY | MNT_ASYNC)) == 0)
(void) vfs_allocate_syncvnode(mp);
mp->mnt_iflag &= ~IMNT_UNMOUNT;
mp->mnt_unmounter = NULL;
mp->mnt_flag |= async;
lockmgr(&mp->mnt_lock, LK_RELEASE | LK_INTERLOCK | LK_REENABLE,
&mountlist_slock);
if (used_syncer)
lockmgr(&syncer_lock, LK_RELEASE, NULL);
while (mp->mnt_wcnt > 0) {
wakeup(mp);
tsleep(&mp->mnt_wcnt, PVFS, "mntwcnt1", 0);
}
return (error);
}
CIRCLEQ_REMOVE(&mountlist, mp, mnt_list);
if ((coveredvp = mp->mnt_vnodecovered) != NULLVP) {
coveredvp->v_mountedhere = NULL;
vrele(coveredvp);
}
mp->mnt_op->vfs_refcount--;
if (LIST_FIRST(&mp->mnt_vnodelist) != NULL)
panic("unmount: dangling vnode");
mp->mnt_iflag |= IMNT_GONE;
lockmgr(&mp->mnt_lock, LK_RELEASE | LK_INTERLOCK, &mountlist_slock);
if (used_syncer)
lockmgr(&syncer_lock, LK_RELEASE, NULL);
while(mp->mnt_wcnt > 0) {
wakeup(mp);
tsleep(&mp->mnt_wcnt, PVFS, "mntwcnt2", 0);
}
free(mp, M_MOUNT);
return (0);
}
/*
* Sync each mounted filesystem.
*/
#ifdef DEBUG
int syncprt = 0;
struct ctldebug debug0 = { "syncprt", &syncprt };
#endif
/* ARGSUSED */
int
sys_sync(l, v, retval)
struct lwp *l;
void *v;
register_t *retval;
{
struct mount *mp, *nmp;
int asyncflag;
struct proc *p = l == NULL ? &proc0 : l->l_proc;
simple_lock(&mountlist_slock);
for (mp = mountlist.cqh_last; mp != (void *)&mountlist; mp = nmp) {
if (vfs_busy(mp, LK_NOWAIT, &mountlist_slock)) {
nmp = mp->mnt_list.cqe_prev;
continue;
}
if ((mp->mnt_flag & MNT_RDONLY) == 0 &&
vn_start_write(NULL, &mp, V_NOWAIT) == 0) {
asyncflag = mp->mnt_flag & MNT_ASYNC;
mp->mnt_flag &= ~MNT_ASYNC;
VFS_SYNC(mp, MNT_NOWAIT, p->p_ucred, p);
if (asyncflag)
mp->mnt_flag |= MNT_ASYNC;
vn_finished_write(mp, 0);
}
simple_lock(&mountlist_slock);
nmp = mp->mnt_list.cqe_prev;
vfs_unbusy(mp);
}
simple_unlock(&mountlist_slock);
#ifdef DEBUG
if (syncprt)
vfs_bufstats();
#endif /* DEBUG */
return (0);
}
/*
* Change filesystem quotas.
*/
/* ARGSUSED */
int
sys_quotactl(l, v, retval)
struct lwp *l;
void *v;
register_t *retval;
{
struct sys_quotactl_args /* {
syscallarg(const char *) path;
syscallarg(int) cmd;
syscallarg(int) uid;
syscallarg(caddr_t) arg;
} */ *uap = v;
struct proc *p = l->l_proc;
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);
error = vn_start_write(nd.ni_vp, &mp, V_WAIT | V_PCATCH);
vrele(nd.ni_vp);
if (error)
return (error);
error = VFS_QUOTACTL(mp, SCARG(uap, cmd), SCARG(uap, uid),
SCARG(uap, arg), p);
vn_finished_write(mp, 0);
return (error);
}
static int
dostatfs(struct mount *mp, struct statfs *sp, struct proc *p, int flags,
int root)
{
struct cwdinfo *cwdi = p->p_cwdi;
int error = 0;
/*
* If MNT_NOWAIT or MNT_LAZY is specified, do not
* refresh the fsstat cache. MNT_WAIT or MNT_LAXY
* overrides MNT_NOWAIT.
*/
if (flags == MNT_NOWAIT || flags == MNT_LAZY ||
(flags != MNT_WAIT && flags != 0)) {
memcpy(sp, &mp->mnt_stat, sizeof(*sp));
goto done;
}
if ((error = VFS_STATFS(mp, sp, p)) != 0) {
return error;
}
if (cwdi->cwdi_rdir == NULL)
(void)memcpy(&mp->mnt_stat, sp, sizeof(mp->mnt_stat));
done:
if (cwdi->cwdi_rdir != NULL) {
size_t len;
char *bp;
char *path = malloc(MAXPATHLEN, M_TEMP, M_WAITOK);
if (!path)
return ENOMEM;
bp = path + MAXPATHLEN;
*--bp = '\0';
error = getcwd_common(cwdi->cwdi_rdir, rootvnode, &bp, path,
MAXPATHLEN / 2, 0, p);
if (error) {
free(path, M_TEMP);
return error;
}
len = strlen(bp);
/*
* for mount points that are below our root, we can see
* them, so we fix up the pathname and return them. The
* rest we cannot see, so we don't allow viewing the
* data.
*/
if (strncmp(bp, sp->f_mntonname, len) == 0) {
strlcpy(sp->f_mntonname, &sp->f_mntonname[len],
sizeof(sp->f_mntonname));
if (sp->f_mntonname[0] == '\0')
(void)strlcpy(sp->f_mntonname, "/",
sizeof(sp->f_mntonname));
} else {
if (root)
(void)strlcpy(sp->f_mntonname, "/",
sizeof(sp->f_mntonname));
else
error = EPERM;
}
free(path, M_TEMP);
}
sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK;
sp->f_oflags = sp->f_flags & 0xffff;
return error;
}
/*
* Get filesystem statistics.
*/
/* ARGSUSED */
int
sys_statfs(l, v, retval)
struct lwp *l;
void *v;
register_t *retval;
{
struct sys_statfs_args /* {
syscallarg(const char *) path;
syscallarg(struct statfs *) buf;
} */ *uap = v;
struct proc *p = l->l_proc;
struct mount *mp;
struct statfs sbuf;
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);
if ((error = dostatfs(mp, &sbuf, p, 0, 1)) != 0)
return error;
return copyout(&sbuf, SCARG(uap, buf), sizeof(sbuf));
}
/*
* Get filesystem statistics.
*/
/* ARGSUSED */
int
sys_fstatfs(l, v, retval)
struct lwp *l;
void *v;
register_t *retval;
{
struct sys_fstatfs_args /* {
syscallarg(int) fd;
syscallarg(struct statfs *) buf;
} */ *uap = v;
struct proc *p = l->l_proc;
struct file *fp;
struct mount *mp;
struct statfs sbuf;
int error;
/* getvnode() will use the descriptor for us */
if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0)
return (error);
mp = ((struct vnode *)fp->f_data)->v_mount;
if ((error = dostatfs(mp, &sbuf, p, 0, 1)) != 0)
goto out;
error = copyout(&sbuf, SCARG(uap, buf), sizeof(sbuf));
out:
FILE_UNUSE(fp, p);
return error;
}
/*
* Get statistics on all filesystems.
*/
int
sys_getfsstat(l, v, retval)
struct lwp *l;
void *v;
register_t *retval;
{
struct sys_getfsstat_args /* {
syscallarg(struct statfs *) buf;
syscallarg(long) bufsize;
syscallarg(int) flags;
} */ *uap = v;
int root = 0;
struct proc *p = l->l_proc;
struct mount *mp, *nmp;
struct statfs sbuf;
caddr_t sfsp;
long count, maxcount, error = 0;
maxcount = SCARG(uap, bufsize) / sizeof(struct statfs);
sfsp = (caddr_t)SCARG(uap, buf);
simple_lock(&mountlist_slock);
count = 0;
for (mp = CIRCLEQ_FIRST(&mountlist); mp != (void *)&mountlist;
mp = nmp) {
if (vfs_busy(mp, LK_NOWAIT, &mountlist_slock)) {
nmp = CIRCLEQ_NEXT(mp, mnt_list);
continue;
}
if (sfsp && count < maxcount) {
error = dostatfs(mp, &sbuf, p, SCARG(uap, flags), 0);
if (error) {
simple_lock(&mountlist_slock);
nmp = CIRCLEQ_NEXT(mp, mnt_list);
vfs_unbusy(mp);
continue;
}
error = copyout(&sbuf, sfsp, sizeof(sbuf));
if (error) {
vfs_unbusy(mp);
return (error);
}
sfsp += sizeof(sbuf);
root |= strcmp(sbuf.f_mntonname, "/") == 0;
}
count++;
simple_lock(&mountlist_slock);
nmp = CIRCLEQ_NEXT(mp, mnt_list);
vfs_unbusy(mp);
}
simple_unlock(&mountlist_slock);
if (root == 0 && p->p_cwdi->cwdi_rdir) {
/*
* fake a root entry
*/
if ((error = dostatfs(p->p_cwdi->cwdi_rdir->v_mount, &sbuf, p,
SCARG(uap, flags), 1)) != 0)
return error;
if (sfsp)
error = copyout(&sbuf, sfsp, sizeof(sbuf));
count++;
}
if (sfsp && count > maxcount)
*retval = maxcount;
else
*retval = count;
return error;
}
/*
* Change current working directory to a given file descriptor.
*/
/* ARGSUSED */
int
sys_fchdir(l, v, retval)
struct lwp *l;
void *v;
register_t *retval;
{
struct sys_fchdir_args /* {
syscallarg(int) fd;
} */ *uap = v;
struct proc *p = l->l_proc;
struct filedesc *fdp = p->p_fd;
struct cwdinfo *cwdi = p->p_cwdi;
struct vnode *vp, *tdp;
struct mount *mp;
struct file *fp;
int error;
/* getvnode() will use the descriptor for us */
if ((error = getvnode(fdp, SCARG(uap, fd), &fp)) != 0)
return (error);
vp = (struct vnode *)fp->f_data;
VREF(vp);
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
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 (vfs_busy(mp, 0, 0))
continue;
error = VFS_ROOT(mp, &tdp);
vfs_unbusy(mp);
if (error)
break;
vput(vp);
vp = tdp;
}
if (error) {
vput(vp);
goto out;
}
VOP_UNLOCK(vp, 0);
/*
* Disallow changing to a directory not under the process's
* current root directory (if there is one).
*/
if (cwdi->cwdi_rdir && !vn_isunder(vp, NULL, p)) {
vrele(vp);
error = EPERM; /* operation not permitted */
goto out;
}
vrele(cwdi->cwdi_cdir);
cwdi->cwdi_cdir = vp;
out:
FILE_UNUSE(fp, p);
return (error);
}
/*
* Change this process's notion of the root directory to a given file descriptor.
*/
int
sys_fchroot(l, v, retval)
struct lwp *l;
void *v;
register_t *retval;
{
struct sys_fchroot_args *uap = v;
struct proc *p = l->l_proc;
struct filedesc *fdp = p->p_fd;
struct cwdinfo *cwdi = p->p_cwdi;
struct vnode *vp;
struct file *fp;
int error;
if ((error = suser(p->p_ucred, &p->p_acflag)) != 0)
return error;
/* getvnode() will use the descriptor for us */
if ((error = getvnode(fdp, SCARG(uap, fd), &fp)) != 0)
return error;
vp = (struct vnode *) fp->f_data;
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
if (vp->v_type != VDIR)
error = ENOTDIR;
else
error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p);
VOP_UNLOCK(vp, 0);
if (error)
goto out;
VREF(vp);
/*
* Prevent escaping from chroot by putting the root under
* the working directory. Silently chdir to / if we aren't
* already there.
*/
if (!vn_isunder(cwdi->cwdi_cdir, vp, p)) {
/*
* XXX would be more failsafe to change directory to a
* deadfs node here instead
*/
vrele(cwdi->cwdi_cdir);
VREF(vp);
cwdi->cwdi_cdir = vp;
}
if (cwdi->cwdi_rdir != NULL)
vrele(cwdi->cwdi_rdir);
cwdi->cwdi_rdir = vp;
out:
FILE_UNUSE(fp, p);
return (error);
}
/*
* Change current working directory (``.'').
*/
/* ARGSUSED */
int
sys_chdir(l, v, retval)
struct lwp *l;
void *v;
register_t *retval;
{
struct sys_chdir_args /* {
syscallarg(const char *) path;
} */ *uap = v;
struct proc *p = l->l_proc;
struct cwdinfo *cwdi = p->p_cwdi;
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(cwdi->cwdi_cdir);
cwdi->cwdi_cdir = nd.ni_vp;
return (0);
}
/*
* Change notion of root (``/'') directory.
*/
/* ARGSUSED */
int
sys_chroot(l, v, retval)
struct lwp *l;
void *v;
register_t *retval;
{
struct sys_chroot_args /* {
syscallarg(const char *) path;
} */ *uap = v;
struct proc *p = l->l_proc;
struct cwdinfo *cwdi = p->p_cwdi;
struct vnode *vp;
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 (cwdi->cwdi_rdir != NULL)
vrele(cwdi->cwdi_rdir);
vp = nd.ni_vp;
cwdi->cwdi_rdir = vp;
/*
* Prevent escaping from chroot by putting the root under
* the working directory. Silently chdir to / if we aren't
* already there.
*/
if (!vn_isunder(cwdi->cwdi_cdir, vp, p)) {
/*
* XXX would be more failsafe to change directory to a
* deadfs node here instead
*/
vrele(cwdi->cwdi_cdir);
VREF(vp);
cwdi->cwdi_cdir = vp;
}
return (0);
}
/*
* Common routine for chroot and chdir.
*/
static int
change_dir(ndp, p)
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);
if (error)
vput(vp);
else
VOP_UNLOCK(vp, 0);
return (error);
}
/*
* Check permissions, allocate an open file structure,
* and call the device open routine if any.
*/
int
sys_open(l, v, retval)
struct lwp *l;
void *v;
register_t *retval;
{
struct sys_open_args /* {
syscallarg(const char *) path;
syscallarg(int) flags;
syscallarg(int) mode;
} */ *uap = v;
struct proc *p = l->l_proc;
struct cwdinfo *cwdi = p->p_cwdi;
struct filedesc *fdp = p->p_fd;
struct file *fp;
struct vnode *vp;
int flags, cmode;
int type, indx, error;
struct flock lf;
struct nameidata nd;
flags = FFLAGS(SCARG(uap, flags));
if ((flags & (FREAD | FWRITE)) == 0)
return (EINVAL);
/* falloc() will use the file descriptor for us */
if ((error = falloc(p, &fp, &indx)) != 0)
return (error);
cmode = ((SCARG(uap, mode) &~ cwdi->cwdi_cmask) & ALLPERMS) &~ S_ISTXT;
NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p);
l->l_dupfd = -indx - 1; /* XXX check for fdopen */
if ((error = vn_open(&nd, flags, cmode)) != 0) {
FILE_UNUSE(fp, p);
ffree(fp);
if ((error == ENODEV || error == ENXIO) &&
l->l_dupfd >= 0 && /* XXX from fdopen */
(error =
dupfdopen(p, indx, l->l_dupfd, flags, error)) == 0) {
*retval = indx;
return (0);
}
if (error == ERESTART)
error = EINTR;
fdremove(fdp, indx);
return (error);
}
l->l_dupfd = 0;
vp = nd.ni_vp;
fp->f_flag = flags & FMASK;
fp->f_type = DTYPE_VNODE;
fp->f_ops = &vnops;
fp->f_data = 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, 0);
error = VOP_ADVLOCK(vp, fp, F_SETLK, &lf, type);
if (error) {
(void) vn_close(vp, fp->f_flag, fp->f_cred, p);
FILE_UNUSE(fp, p);
ffree(fp);
fdremove(fdp, indx);
return (error);
}
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
fp->f_flag |= FHASLOCK;
}
VOP_UNLOCK(vp, 0);
*retval = indx;
FILE_SET_MATURE(fp);
FILE_UNUSE(fp, p);
return (0);
}
/*
* Get file handle system call
*/
int
sys_getfh(l, v, retval)
struct lwp *l;
void *v;
register_t *retval;
{
struct sys_getfh_args /* {
syscallarg(char *) fname;
syscallarg(fhandle_t *) fhp;
} */ *uap = v;
struct proc *p = l->l_proc;
struct vnode *vp;
fhandle_t fh;
int error;
struct nameidata nd;
/*
* Must be super user
*/
error = suser(p->p_ucred, &p->p_acflag);
if (error)
return (error);
NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE,
SCARG(uap, fname), p);
error = namei(&nd);
if (error)
return (error);
vp = nd.ni_vp;
memset(&fh, 0, sizeof(fh));
fh.fh_fsid = vp->v_mount->mnt_stat.f_fsid;
error = VFS_VPTOFH(vp, &fh.fh_fid);
vput(vp);
if (error)
return (error);
error = copyout(&fh, (caddr_t)SCARG(uap, fhp), sizeof (fh));
return (error);
}
/*
* Open a file given a file handle.
*
* Check permissions, allocate an open file structure,
* and call the device open routine if any.
*/
int
sys_fhopen(l, v, retval)
struct lwp *l;
void *v;
register_t *retval;
{
struct sys_fhopen_args /* {
syscallarg(const fhandle_t *) fhp;
syscallarg(int) flags;
} */ *uap = v;
struct proc *p = l->l_proc;
struct filedesc *fdp = p->p_fd;
struct file *fp;
struct vnode *vp = NULL;
struct mount *mp;
struct ucred *cred = p->p_ucred;
int flags;
struct file *nfp;
int type, indx, error=0;
struct flock lf;
struct vattr va;
fhandle_t fh;
/*
* Must be super user
*/
if ((error = suser(p->p_ucred, &p->p_acflag)))
return (error);
flags = FFLAGS(SCARG(uap, flags));
if ((flags & (FREAD | FWRITE)) == 0)
return (EINVAL);
if ((flags & O_CREAT))
return (EINVAL);
/* falloc() will use the file descriptor for us */
if ((error = falloc(p, &nfp, &indx)) != 0)
return (error);
fp = nfp;
if ((error = copyin(SCARG(uap, fhp), &fh, sizeof(fhandle_t))) != 0)
goto bad;
if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL) {
error = ESTALE;
goto bad;
}
if ((error = VFS_FHTOVP(mp, &fh.fh_fid, &vp)) != 0) {
vp = NULL; /* most likely unnecessary sanity for bad: */
goto bad;
}
/* Now do an effective vn_open */
if (vp->v_type == VSOCK) {
error = EOPNOTSUPP;
goto bad;
}
if (flags & FREAD) {
if ((error = VOP_ACCESS(vp, VREAD, cred, p)) != 0)
goto bad;
}
if (flags & (FWRITE | O_TRUNC)) {
if (vp->v_type == VDIR) {
error = EISDIR;
goto bad;
}
if ((error = vn_writechk(vp)) != 0 ||
(error = VOP_ACCESS(vp, VWRITE, cred, p)) != 0)
goto bad;
}
if (flags & O_TRUNC) {
if ((error = vn_start_write(vp, &mp, V_WAIT | V_PCATCH)) != 0)
goto bad;
VOP_UNLOCK(vp, 0); /* XXX */
VOP_LEASE(vp, p, cred, LEASE_WRITE);
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); /* XXX */
VATTR_NULL(&va);
va.va_size = 0;
error = VOP_SETATTR(vp, &va, cred, p);
vn_finished_write(mp, 0);
if (error)
goto bad;
}
if ((error = VOP_OPEN(vp, flags, cred, p)) != 0)
goto bad;
if (vp->v_type == VREG &&
uvn_attach(vp, flags & FWRITE ? VM_PROT_WRITE : 0) == NULL) {
error = EIO;
goto bad;
}
if (flags & FWRITE)
vp->v_writecount++;
/* done with modified vn_open, now finish what sys_open does. */
fp->f_flag = flags & FMASK;
fp->f_type = DTYPE_VNODE;
fp->f_ops = &vnops;
fp->f_data = 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, 0);
error = VOP_ADVLOCK(vp, fp, F_SETLK, &lf, type);
if (error) {
(void) vn_close(vp, fp->f_flag, fp->f_cred, p);
FILE_UNUSE(fp, p);
ffree(fp);
fdremove(fdp, indx);
return (error);
}
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
fp->f_flag |= FHASLOCK;
}
VOP_UNLOCK(vp, 0);
*retval = indx;
FILE_SET_MATURE(fp);
FILE_UNUSE(fp, p);
return (0);
bad:
FILE_UNUSE(fp, p);
ffree(fp);
fdremove(fdp, indx);
if (vp != NULL)
vput(vp);
return (error);
}
/* ARGSUSED */
int
sys_fhstat(l, v, retval)
struct lwp *l;
void *v;
register_t *retval;
{
struct sys_fhstat_args /* {
syscallarg(const fhandle_t *) fhp;
syscallarg(struct stat *) sb;
} */ *uap = v;
struct proc *p = l->l_proc;
struct stat sb;
int error;
fhandle_t fh;
struct mount *mp;
struct vnode *vp;
/*
* Must be super user
*/
if ((error = suser(p->p_ucred, &p->p_acflag)))
return (error);
if ((error = copyin(SCARG(uap, fhp), &fh, sizeof(fhandle_t))) != 0)
return (error);
if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL)
return (ESTALE);
if ((error = VFS_FHTOVP(mp, &fh.fh_fid, &vp)))
return (error);
error = vn_stat(vp, &sb, p);
vput(vp);
if (error)
return (error);
error = copyout(&sb, SCARG(uap, sb), sizeof(sb));
return (error);
}
/* ARGSUSED */
int
sys_fhstatfs(l, v, retval)
struct lwp *l;
void *v;
register_t *retval;
{
struct sys_fhstatfs_args /*
syscallarg(const fhandle_t *) fhp;
syscallarg(struct statfs *) buf;
} */ *uap = v;
struct proc *p = l->l_proc;
struct statfs sbuf;
fhandle_t fh;
struct mount *mp;
struct vnode *vp;
int error;
/*
* Must be super user
*/
if ((error = suser(p->p_ucred, &p->p_acflag)))
return (error);
if ((error = copyin(SCARG(uap, fhp), &fh, sizeof(fhandle_t))) != 0)
return (error);
if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL)
return (ESTALE);
if ((error = VFS_FHTOVP(mp, &fh.fh_fid, &vp)))
return (error);
mp = vp->v_mount;
vput(vp);
if ((error = VFS_STATFS(mp, &sbuf, p)) != 0)
return (error);
return (copyout(&sbuf, SCARG(uap, buf), sizeof(sbuf)));
}
/*
* Create a special file.
*/
/* ARGSUSED */
int
sys_mknod(l, v, retval)
struct lwp *l;
void *v;
register_t *retval;
{
struct sys_mknod_args /* {
syscallarg(const char *) path;
syscallarg(int) mode;
syscallarg(int) dev;
} */ *uap = v;
struct proc *p = l->l_proc;
struct vnode *vp;
struct mount *mp;
struct vattr vattr;
int error;
int whiteout = 0;
struct nameidata nd;
if ((error = suser(p->p_ucred, &p->p_acflag)) != 0)
return (error);
restart:
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_cwdi->cwdi_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 (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) {
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);
if ((error = vn_start_write(NULL, &mp,
V_WAIT | V_SLEEPONLY | V_PCATCH)) != 0)
return (error);
goto restart;
}
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);
if (error == 0)
vput(nd.ni_vp);
}
} 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);
}
vn_finished_write(mp, 0);
return (error);
}
/*
* Create a named pipe.
*/
/* ARGSUSED */
int
sys_mkfifo(l, v, retval)
struct lwp *l;
void *v;
register_t *retval;
{
struct sys_mkfifo_args /* {
syscallarg(const char *) path;
syscallarg(int) mode;
} */ *uap = v;
struct proc *p = l->l_proc;
struct mount *mp;
struct vattr vattr;
int error;
struct nameidata nd;
restart:
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);
}
if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) {
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);
if ((error = vn_start_write(NULL, &mp,
V_WAIT | V_SLEEPONLY | V_PCATCH)) != 0)
return (error);
goto restart;
}
VATTR_NULL(&vattr);
vattr.va_type = VFIFO;
vattr.va_mode = (SCARG(uap, mode) & ALLPERMS) &~ p->p_cwdi->cwdi_cmask;
VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE);
error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr);
if (error == 0)
vput(nd.ni_vp);
vn_finished_write(mp, 0);
return (error);
}
/*
* Make a hard file link.
*/
/* ARGSUSED */
int
sys_link(l, v, retval)
struct lwp *l;
void *v;
register_t *retval;
{
struct sys_link_args /* {
syscallarg(const char *) path;
syscallarg(const char *) link;
} */ *uap = v;
struct proc *p = l->l_proc;
struct vnode *vp;
struct mount *mp;
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;
if ((error = vn_start_write(vp, &mp, V_WAIT | V_PCATCH)) != 0) {
vrele(vp);
return (error);
}
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);
vn_finished_write(mp, 0);
return (error);
}
/*
* Make a symbolic link.
*/
/* ARGSUSED */
int
sys_symlink(l, v, retval)
struct lwp *l;
void *v;
register_t *retval;
{
struct sys_symlink_args /* {
syscallarg(const char *) path;
syscallarg(const char *) link;
} */ *uap = v;
struct proc *p = l->l_proc;
struct mount *mp;
struct vattr vattr;
char *path;
int error;
struct nameidata nd;
path = PNBUF_GET();
error = copyinstr(SCARG(uap, path), path, MAXPATHLEN, NULL);
if (error)
goto out;
restart:
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;
}
if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) {
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 ((error = vn_start_write(NULL, &mp,
V_WAIT | V_SLEEPONLY | V_PCATCH)) != 0)
return (error);
goto restart;
}
VATTR_NULL(&vattr);
vattr.va_mode = ACCESSPERMS &~ p->p_cwdi->cwdi_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);
if (error == 0)
vput(nd.ni_vp);
vn_finished_write(mp, 0);
out:
PNBUF_PUT(path);
return (error);
}
/*
* Delete a whiteout from the filesystem.
*/
/* ARGSUSED */
int
sys_undelete(l, v, retval)
struct lwp *l;
void *v;
register_t *retval;
{
struct sys_undelete_args /* {
syscallarg(const char *) path;
} */ *uap = v;
struct proc *p = l->l_proc;
int error;
struct mount *mp;
struct nameidata nd;
restart:
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);
}
if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) {
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 ((error = vn_start_write(NULL, &mp,
V_WAIT | V_SLEEPONLY | V_PCATCH)) != 0)
return (error);
goto restart;
}
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);
vn_finished_write(mp, 0);
return (error);
}
/*
* Delete a name from the filesystem.
*/
/* ARGSUSED */
int
sys_unlink(l, v, retval)
struct lwp *l;
void *v;
register_t *retval;
{
struct sys_unlink_args /* {
syscallarg(const char *) path;
} */ *uap = v;
struct proc *p = l->l_proc;
struct mount *mp;
struct vnode *vp;
int error;
struct nameidata nd;
restart:
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 (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) {
VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd);
if (nd.ni_dvp == vp)
vrele(nd.ni_dvp);
else
vput(nd.ni_dvp);
vput(vp);
if ((error = vn_start_write(NULL, &mp,
V_WAIT | V_SLEEPONLY | V_PCATCH)) != 0)
return (error);
goto restart;
}
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);
vn_finished_write(mp, 0);
out:
return (error);
}
/*
* Reposition read/write file offset.
*/
int
sys_lseek(l, v, retval)
struct lwp *l;
void *v;
register_t *retval;
{
struct sys_lseek_args /* {
syscallarg(int) fd;
syscallarg(int) pad;
syscallarg(off_t) offset;
syscallarg(int) whence;
} */ *uap = v;
struct proc *p = l->l_proc;
struct ucred *cred = p->p_ucred;
struct filedesc *fdp = p->p_fd;
struct file *fp;
struct vnode *vp;
struct vattr vattr;
off_t newoff;
int error;
if ((fp = fd_getfile(fdp, SCARG(uap, fd))) == NULL)
return (EBADF);
FILE_USE(fp);
vp = (struct vnode *)fp->f_data;
if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) {
error = ESPIPE;
goto out;
}
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)
goto out;
newoff = SCARG(uap, offset) + vattr.va_size;
break;
case SEEK_SET:
newoff = SCARG(uap, offset);
break;
default:
error = EINVAL;
goto out;
}
if ((error = VOP_SEEK(vp, fp->f_offset, newoff, cred)) != 0)
goto out;
*(off_t *)retval = fp->f_offset = newoff;
out:
FILE_UNUSE(fp, p);
return (error);
}
/*
* Positional read system call.
*/
int
sys_pread(l, v, retval)
struct lwp *l;
void *v;
register_t *retval;
{
struct sys_pread_args /* {
syscallarg(int) fd;
syscallarg(void *) buf;
syscallarg(size_t) nbyte;
syscallarg(off_t) offset;
} */ *uap = v;
struct proc *p = l->l_proc;
struct filedesc *fdp = p->p_fd;
struct file *fp;
struct vnode *vp;
off_t offset;
int error, fd = SCARG(uap, fd);
if ((fp = fd_getfile(fdp, fd)) == NULL)
return (EBADF);
if ((fp->f_flag & FREAD) == 0) {
simple_unlock(&fp->f_slock);
return (EBADF);
}
FILE_USE(fp);
vp = (struct vnode *)fp->f_data;
if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) {
error = ESPIPE;
goto out;
}
offset = SCARG(uap, offset);
/*
* XXX This works because no file systems actually
* XXX take any action on the seek operation.
*/
if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0)
goto out;
/* dofileread() will unuse the descriptor for us */
return (dofileread(p, fd, fp, SCARG(uap, buf), SCARG(uap, nbyte),
&offset, 0, retval));
out:
FILE_UNUSE(fp, p);
return (error);
}
/*
* Positional scatter read system call.
*/
int
sys_preadv(l, v, retval)
struct lwp *l;
void *v;
register_t *retval;
{
struct sys_preadv_args /* {
syscallarg(int) fd;
syscallarg(const struct iovec *) iovp;
syscallarg(int) iovcnt;
syscallarg(off_t) offset;
} */ *uap = v;
struct proc *p = l->l_proc;
struct filedesc *fdp = p->p_fd;
struct file *fp;
struct vnode *vp;
off_t offset;
int error, fd = SCARG(uap, fd);
if ((fp = fd_getfile(fdp, fd)) == NULL)
return (EBADF);
if ((fp->f_flag & FREAD) == 0) {
simple_unlock(&fp->f_slock);
return (EBADF);
}
FILE_USE(fp);
vp = (struct vnode *)fp->f_data;
if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) {
error = ESPIPE;
goto out;
}
offset = SCARG(uap, offset);
/*
* XXX This works because no file systems actually
* XXX take any action on the seek operation.
*/
if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0)
goto out;
/* dofilereadv() will unuse the descriptor for us */
return (dofilereadv(p, fd, fp, SCARG(uap, iovp), SCARG(uap, iovcnt),
&offset, 0, retval));
out:
FILE_UNUSE(fp, p);
return (error);
}
/*
* Positional write system call.
*/
int
sys_pwrite(l, v, retval)
struct lwp *l;
void *v;
register_t *retval;
{
struct sys_pwrite_args /* {
syscallarg(int) fd;
syscallarg(const void *) buf;
syscallarg(size_t) nbyte;
syscallarg(off_t) offset;
} */ *uap = v;
struct proc *p = l->l_proc;
struct filedesc *fdp = p->p_fd;
struct file *fp;
struct vnode *vp;
off_t offset;
int error, fd = SCARG(uap, fd);
if ((fp = fd_getfile(fdp, fd)) == NULL)
return (EBADF);
if ((fp->f_flag & FWRITE) == 0) {
simple_unlock(&fp->f_slock);
return (EBADF);
}
FILE_USE(fp);
vp = (struct vnode *)fp->f_data;
if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) {
error = ESPIPE;
goto out;
}
offset = SCARG(uap, offset);
/*
* XXX This works because no file systems actually
* XXX take any action on the seek operation.
*/
if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0)
goto out;
/* dofilewrite() will unuse the descriptor for us */
return (dofilewrite(p, fd, fp, SCARG(uap, buf), SCARG(uap, nbyte),
&offset, 0, retval));
out:
FILE_UNUSE(fp, p);
return (error);
}
/*
* Positional gather write system call.
*/
int
sys_pwritev(l, v, retval)
struct lwp *l;
void *v;
register_t *retval;
{
struct sys_pwritev_args /* {
syscallarg(int) fd;
syscallarg(const struct iovec *) iovp;
syscallarg(int) iovcnt;
syscallarg(off_t) offset;
} */ *uap = v;
struct proc *p = l->l_proc;
struct filedesc *fdp = p->p_fd;
struct file *fp;
struct vnode *vp;
off_t offset;
int error, fd = SCARG(uap, fd);
if ((fp = fd_getfile(fdp, fd)) == NULL)
return (EBADF);
if ((fp->f_flag & FWRITE) == 0) {
simple_unlock(&fp->f_slock);
return (EBADF);
}
FILE_USE(fp);
vp = (struct vnode *)fp->f_data;
if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) {
error = ESPIPE;
goto out;
}
offset = SCARG(uap, offset);
/*
* XXX This works because no file systems actually
* XXX take any action on the seek operation.
*/
if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0)
goto out;
/* dofilewritev() will unuse the descriptor for us */
return (dofilewritev(p, fd, fp, SCARG(uap, iovp), SCARG(uap, iovcnt),
&offset, 0, retval));
out:
FILE_UNUSE(fp, p);
return (error);
}
/*
* Check access permissions.
*/
int
sys_access(l, v, retval)
struct lwp *l;
void *v;
register_t *retval;
{
struct sys_access_args /* {
syscallarg(const char *) path;
syscallarg(int) flags;
} */ *uap = v;
struct proc *p = l->l_proc;
struct ucred *cred = crget();
struct vnode *vp;
int error, flags;
struct nameidata nd;
(void)memcpy(cred, p->p_ucred, sizeof(*cred));
cred->cr_ref = 1;
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);
/* Override default credentials */
nd.ni_cnd.cn_cred = cred;
if ((error = namei(&nd)) != 0)
goto out;
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;
error = VOP_ACCESS(vp, flags, cred, p);
if (!error && (flags & VWRITE))
error = vn_writechk(vp);
}
vput(vp);
out:
crfree(cred);
return (error);
}
/*
* Get file status; this version follows links.
*/
/* ARGSUSED */
int
sys___stat13(l, v, retval)
struct lwp *l;
void *v;
register_t *retval;
{
struct sys___stat13_args /* {
syscallarg(const char *) path;
syscallarg(struct stat *) ub;
} */ *uap = v;
struct proc *p = l->l_proc;
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(l, v, retval)
struct lwp *l;
void *v;
register_t *retval;
{
struct sys___lstat13_args /* {
syscallarg(const char *) path;
syscallarg(struct stat *) ub;
} */ *uap = v;
struct proc *p = l->l_proc;
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(l, v, retval)
struct lwp *l;
void *v;
register_t *retval;
{
struct sys_pathconf_args /* {
syscallarg(const char *) path;
syscallarg(int) name;
} */ *uap = v;
struct proc *p = l->l_proc;
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(l, v, retval)
struct lwp *l;
void *v;
register_t *retval;
{
struct sys_readlink_args /* {
syscallarg(const char *) path;
syscallarg(char *) buf;
syscallarg(size_t) count;
} */ *uap = v;
struct proc *p = l->l_proc;
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(l, v, retval)
struct lwp *l;
void *v;
register_t *retval;
{
struct sys_chflags_args /* {
syscallarg(const char *) path;
syscallarg(u_long) flags;
} */ *uap = v;
struct proc *p = l->l_proc;
struct vnode *vp;
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;
error = change_flags(vp, SCARG(uap, flags), p);
vput(vp);
return (error);
}
/*
* Change flags of a file given a file descriptor.
*/
/* ARGSUSED */
int
sys_fchflags(l, v, retval)
struct lwp *l;
void *v;
register_t *retval;
{
struct sys_fchflags_args /* {
syscallarg(int) fd;
syscallarg(u_long) flags;
} */ *uap = v;
struct proc *p = l->l_proc;
struct vnode *vp;
struct file *fp;
int error;
/* getvnode() will use the descriptor for us */
if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0)
return (error);
vp = (struct vnode *)fp->f_data;
error = change_flags(vp, SCARG(uap, flags), p);
VOP_UNLOCK(vp, 0);
FILE_UNUSE(fp, p);
return (error);
}
/*
* Change flags of a file given a path name; this version does
* not follow links.
*/
int
sys_lchflags(l, v, retval)
struct lwp *l;
void *v;
register_t *retval;
{
struct sys_lchflags_args /* {
syscallarg(const char *) path;
syscallarg(u_long) flags;
} */ *uap = v;
struct proc *p = l->l_proc;
struct vnode *vp;
int error;
struct nameidata nd;
NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p);
if ((error = namei(&nd)) != 0)
return (error);
vp = nd.ni_vp;
error = change_flags(vp, SCARG(uap, flags), p);
vput(vp);
return (error);
}
/*
* Common routine to change flags of a file.
*/
int
change_flags(vp, flags, p)
struct vnode *vp;
u_long flags;
struct proc *p;
{
struct mount *mp;
struct vattr vattr;
int error;
if ((error = vn_start_write(vp, &mp, V_WAIT | V_PCATCH)) != 0)
return (error);
VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE);
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
/*
* Non-superusers cannot change the flags on devices, even if they
* own them.
*/
if (suser(p->p_ucred, &p->p_acflag) != 0) {
if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0)
goto out;
if (vattr.va_type == VCHR || vattr.va_type == VBLK) {
error = EINVAL;
goto out;
}
}
VATTR_NULL(&vattr);
vattr.va_flags = flags;
error = VOP_SETATTR(vp, &vattr, p->p_ucred, p);
out:
vn_finished_write(mp, 0);
return (error);
}
/*
* Change mode of a file given path name; this version follows links.
*/
/* ARGSUSED */
int
sys_chmod(l, v, retval)
struct lwp *l;
void *v;
register_t *retval;
{
struct sys_chmod_args /* {
syscallarg(const char *) path;
syscallarg(int) mode;
} */ *uap = v;
struct proc *p = l->l_proc;
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(l, v, retval)
struct lwp *l;
void *v;
register_t *retval;
{
struct sys_fchmod_args /* {
syscallarg(int) fd;
syscallarg(int) mode;
} */ *uap = v;
struct proc *p = l->l_proc;
struct file *fp;
int error;
/* getvnode() will use the descriptor for us */
if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0)
return (error);
error = change_mode((struct vnode *)fp->f_data, SCARG(uap, mode), p);
FILE_UNUSE(fp, p);
return (error);
}
/*
* Change mode of a file given path name; this version does not follow links.
*/
/* ARGSUSED */
int
sys_lchmod(l, v, retval)
struct lwp *l;
void *v;
register_t *retval;
{
struct sys_lchmod_args /* {
syscallarg(const char *) path;
syscallarg(int) mode;
} */ *uap = v;
struct proc *p = l->l_proc;
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 mount *mp;
struct vattr vattr;
int error;
if ((error = vn_start_write(vp, &mp, V_WAIT | V_PCATCH)) != 0)
return (error);
VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE);
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
VATTR_NULL(&vattr);
vattr.va_mode = mode & ALLPERMS;
error = VOP_SETATTR(vp, &vattr, p->p_ucred, p);
VOP_UNLOCK(vp, 0);
vn_finished_write(mp, 0);
return (error);
}
/*
* Set ownership given a path name; this version follows links.
*/
/* ARGSUSED */
int
sys_chown(l, v, retval)
struct lwp *l;
void *v;
register_t *retval;
{
struct sys_chown_args /* {
syscallarg(const char *) path;
syscallarg(uid_t) uid;
syscallarg(gid_t) gid;
} */ *uap = v;
struct proc *p = l->l_proc;
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(l, v, retval)
struct lwp *l;
void *v;
register_t *retval;
{
struct sys_chown_args /* {
syscallarg(const char *) path;
syscallarg(uid_t) uid;
syscallarg(gid_t) gid;
} */ *uap = v;
struct proc *p = l->l_proc;
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(l, v, retval)
struct lwp *l;
void *v;
register_t *retval;
{
struct sys_fchown_args /* {
syscallarg(int) fd;
syscallarg(uid_t) uid;
syscallarg(gid_t) gid;
} */ *uap = v;
struct proc *p = l->l_proc;
int error;
struct file *fp;
/* getvnode() will use the descriptor for us */
if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0)
return (error);
error = change_owner((struct vnode *)fp->f_data, SCARG(uap, uid),
SCARG(uap, gid), p, 0);
FILE_UNUSE(fp, p);
return (error);
}
/*
* Set ownership given a file descriptor, providing POSIX/XPG semantics.
*/
/* ARGSUSED */
int
sys___posix_fchown(l, v, retval)
struct lwp *l;
void *v;
register_t *retval;
{
struct sys_fchown_args /* {
syscallarg(int) fd;
syscallarg(uid_t) uid;
syscallarg(gid_t) gid;
} */ *uap = v;
struct proc *p = l->l_proc;
int error;
struct file *fp;
/* getvnode() will use the descriptor for us */
if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0)
return (error);
error = change_owner((struct vnode *)fp->f_data, SCARG(uap, uid),
SCARG(uap, gid), p, 1);
FILE_UNUSE(fp, p);
return (error);
}
/*
* Set ownership given a path name; this version does not follow links.
*/
/* ARGSUSED */
int
sys_lchown(l, v, retval)
struct lwp *l;
void *v;
register_t *retval;
{
struct sys_lchown_args /* {
syscallarg(const char *) path;
syscallarg(uid_t) uid;
syscallarg(gid_t) gid;
} */ *uap = v;
struct proc *p = l->l_proc;
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(l, v, retval)
struct lwp *l;
void *v;
register_t *retval;
{
struct sys_lchown_args /* {
syscallarg(const char *) path;
syscallarg(uid_t) uid;
syscallarg(gid_t) gid;
} */ *uap = v;
struct proc *p = l->l_proc;
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)
struct vnode *vp;
uid_t uid;
gid_t gid;
struct proc *p;
int posix_semantics;
{
struct mount *mp;
struct vattr vattr;
mode_t newmode;
int error;
if ((error = vn_start_write(vp, &mp, V_WAIT | V_PCATCH)) != 0)
return (error);
VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE);
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0)
goto out;
#define CHANGED(x) ((int)(x) != -1)
newmode = vattr.va_mode;
if (posix_semantics) {
/*
* POSIX/XPG semantics: if the caller is not the super-user,
* clear set-user-id and set-group-id bits. Both POSIX and
* the XPG consider the behaviour for calls by the super-user
* implementation-defined; we leave the set-user-id and set-
* group-id settings intact in that case.
*/
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 : (uid_t)VNOVAL;
vattr.va_gid = CHANGED(gid) ? gid : (gid_t)VNOVAL;
vattr.va_mode = newmode;
error = VOP_SETATTR(vp, &vattr, p->p_ucred, p);
#undef CHANGED
out:
VOP_UNLOCK(vp, 0);
vn_finished_write(mp, 0);
return (error);
}
/*
* Set the access and modification times given a path name; this
* version follows links.
*/
/* ARGSUSED */
int
sys_utimes(l, v, retval)
struct lwp *l;
void *v;
register_t *retval;
{
struct sys_utimes_args /* {
syscallarg(const char *) path;
syscallarg(const struct timeval *) tptr;
} */ *uap = v;
struct proc *p = l->l_proc;
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(l, v, retval)
struct lwp *l;
void *v;
register_t *retval;
{
struct sys_futimes_args /* {
syscallarg(int) fd;
syscallarg(const struct timeval *) tptr;
} */ *uap = v;
struct proc *p = l->l_proc;
int error;
struct file *fp;
/* getvnode() will use the descriptor for us */
if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0)
return (error);
error = change_utimes((struct vnode *)fp->f_data, SCARG(uap, tptr), p);
FILE_UNUSE(fp, p);
return (error);
}
/*
* Set the access and modification times given a path name; this
* version does not follow links.
*/
/* ARGSUSED */
int
sys_lutimes(l, v, retval)
struct lwp *l;
void *v;
register_t *retval;
{
struct sys_lutimes_args /* {
syscallarg(const char *) path;
syscallarg(const struct timeval *) tptr;
} */ *uap = v;
struct proc *p = l->l_proc;
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 mount *mp;
struct vattr vattr;
int error;
if ((error = vn_start_write(vp, &mp, V_WAIT | V_PCATCH)) != 0)
return (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)
goto out;
}
VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE);
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
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, 0);
out:
vn_finished_write(mp, 0);
return (error);
}
/*
* Truncate a file given its path name.
*/
/* ARGSUSED */
int
sys_truncate(l, v, retval)
struct lwp *l;
void *v;
register_t *retval;
{
struct sys_truncate_args /* {
syscallarg(const char *) path;
syscallarg(int) pad;
syscallarg(off_t) length;
} */ *uap = v;
struct proc *p = l->l_proc;
struct vnode *vp;
struct mount *mp;
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 ((error = vn_start_write(vp, &mp, V_WAIT | V_PCATCH)) != 0) {
vrele(vp);
return (error);
}
VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE);
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
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);
vn_finished_write(mp, 0);
return (error);
}
/*
* Truncate a file given a file descriptor.
*/
/* ARGSUSED */
int
sys_ftruncate(l, v, retval)
struct lwp *l;
void *v;
register_t *retval;
{
struct sys_ftruncate_args /* {
syscallarg(int) fd;
syscallarg(int) pad;
syscallarg(off_t) length;
} */ *uap = v;
struct proc *p = l->l_proc;
struct mount *mp;
struct vattr vattr;
struct vnode *vp;
struct file *fp;
int error;
/* getvnode() will use the descriptor for us */
if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0)
return (error);
if ((fp->f_flag & FWRITE) == 0) {
error = EINVAL;
goto out;
}
vp = (struct vnode *)fp->f_data;
if ((error = vn_start_write(vp, &mp, V_WAIT | V_PCATCH)) != 0) {
FILE_UNUSE(fp, p);
return (error);
}
VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE);
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
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, 0);
vn_finished_write(mp, 0);
out:
FILE_UNUSE(fp, p);
return (error);
}
/*
* Sync an open file.
*/
/* ARGSUSED */
int
sys_fsync(l, v, retval)
struct lwp *l;
void *v;
register_t *retval;
{
struct sys_fsync_args /* {
syscallarg(int) fd;
} */ *uap = v;
struct proc *p = l->l_proc;
struct vnode *vp;
struct mount *mp;
struct file *fp;
int error;
/* getvnode() will use the descriptor for us */
if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0)
return (error);
vp = (struct vnode *)fp->f_data;
if ((error = vn_start_write(vp, &mp, V_WAIT | V_PCATCH)) != 0) {
FILE_UNUSE(fp, p);
return (error);
}
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
error = VOP_FSYNC(vp, fp->f_cred, FSYNC_WAIT, 0, 0, p);
if (error == 0 && bioops.io_fsync != NULL &&
vp->v_mount && (vp->v_mount->mnt_flag & MNT_SOFTDEP))
(*bioops.io_fsync)(vp);
VOP_UNLOCK(vp, 0);
vn_finished_write(mp, 0);
FILE_UNUSE(fp, p);
return (error);
}
/*
* Sync the data of an open file.
*/
/* ARGSUSED */
int
sys_fdatasync(l, v, retval)
struct lwp *l;
void *v;
register_t *retval;
{
struct sys_fdatasync_args /* {
syscallarg(int) fd;
} */ *uap = v;
struct proc *p = l->l_proc;
struct vnode *vp;
struct file *fp;
int error;
/* getvnode() will use the descriptor for us */
if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0)
return (error);
if ((fp->f_flag & FWRITE) == 0) {
FILE_UNUSE(fp, p);
return (EBADF);
}
vp = (struct vnode *)fp->f_data;
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
error = VOP_FSYNC(vp, fp->f_cred, FSYNC_WAIT|FSYNC_DATAONLY, 0, 0, p);
VOP_UNLOCK(vp, 0);
FILE_UNUSE(fp, p);
return (error);
}
/*
* Rename files, (standard) BSD semantics frontend.
*/
/* ARGSUSED */
int
sys_rename(l, v, retval)
struct lwp *l;
void *v;
register_t *retval;
{
struct sys_rename_args /* {
syscallarg(const char *) from;
syscallarg(const char *) to;
} */ *uap = v;
struct proc *p = l->l_proc;
return (rename_files(SCARG(uap, from), SCARG(uap, to), p, 0));
}
/*
* Rename files, POSIX semantics frontend.
*/
/* ARGSUSED */
int
sys___posix_rename(l, v, retval)
struct lwp *l;
void *v;
register_t *retval;
{
struct sys___posix_rename_args /* {
syscallarg(const char *) from;
syscallarg(const char *) to;
} */ *uap = v;
struct proc *p = l->l_proc;
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;
{
struct mount *mp = NULL;
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;
error = vn_start_write(fvp, &mp, V_WAIT | V_PCATCH);
if (error != 0) {
VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd);
vrele(fromnd.ni_dvp);
vrele(fvp);
if (fromnd.ni_startdir)
vrele(fromnd.ni_startdir);
PNBUF_PUT(fromnd.ni_cnd.cn_pnbuf);
return (error);
}
NDINIT(&tond, RENAME, LOCKPARENT | LOCKLEAF | NOCACHE | SAVESTART |
(fvp->v_type == VDIR ? CREATEDIR : 0), 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 &&
!memcmp(fromnd.ni_cnd.cn_nameptr,
tond.ni_cnd.cn_nameptr,
fromnd.ni_cnd.cn_namelen))
error = -1;
}
out:
if (!error) {
VOP_LEASE(tdvp, p, p->p_ucred, LEASE_WRITE);
if (fromnd.ni_dvp != tdvp)
VOP_LEASE(fromnd.ni_dvp, p, p->p_ucred, LEASE_WRITE);
if (tvp) {
VOP_LEASE(tvp, p, p->p_ucred, LEASE_WRITE);
}
error = VOP_RENAME(fromnd.ni_dvp, fromnd.ni_vp, &fromnd.ni_cnd,
tond.ni_dvp, tond.ni_vp, &tond.ni_cnd);
} else {
VOP_ABORTOP(tond.ni_dvp, &tond.ni_cnd);
if (tdvp == tvp)
vrele(tdvp);
else
vput(tdvp);
if (tvp)
vput(tvp);
VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd);
vrele(fromnd.ni_dvp);
vrele(fvp);
}
vrele(tond.ni_startdir);
PNBUF_PUT(tond.ni_cnd.cn_pnbuf);
out1:
vn_finished_write(mp, 0);
if (fromnd.ni_startdir)
vrele(fromnd.ni_startdir);
PNBUF_PUT(fromnd.ni_cnd.cn_pnbuf);
return (error == -1 ? 0 : error);
}
/*
* Make a directory file.
*/
/* ARGSUSED */
int
sys_mkdir(l, v, retval)
struct lwp *l;
void *v;
register_t *retval;
{
struct sys_mkdir_args /* {
syscallarg(const char *) path;
syscallarg(int) mode;
} */ *uap = v;
struct proc *p = l->l_proc;
struct mount *mp;
struct vnode *vp;
struct vattr vattr;
int error;
struct nameidata nd;
restart:
NDINIT(&nd, CREATE, LOCKPARENT | CREATEDIR, 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);
}
if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) {
VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd);
if (nd.ni_dvp == vp)
vrele(nd.ni_dvp);
else
vput(nd.ni_dvp);
if ((error = vn_start_write(NULL, &mp,
V_WAIT | V_SLEEPONLY | V_PCATCH)) != 0)
return (error);
goto restart;
}
VATTR_NULL(&vattr);
vattr.va_type = VDIR;
vattr.va_mode =
(SCARG(uap, mode) & ACCESSPERMS) &~ p->p_cwdi->cwdi_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);
vn_finished_write(mp, 0);
return (error);
}
/*
* Remove a directory file.
*/
/* ARGSUSED */
int
sys_rmdir(l, v, retval)
struct lwp *l;
void *v;
register_t *retval;
{
struct sys_rmdir_args /* {
syscallarg(const char *) path;
} */ *uap = v;
struct proc *p = l->l_proc;
struct mount *mp;
struct vnode *vp;
int error;
struct nameidata nd;
restart:
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;
goto out;
}
if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) {
VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd);
if (nd.ni_dvp == vp)
vrele(nd.ni_dvp);
else
vput(nd.ni_dvp);
vput(vp);
if ((error = vn_start_write(NULL, &mp,
V_WAIT | V_SLEEPONLY | V_PCATCH)) != 0)
return (error);
goto restart;
}
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);
vn_finished_write(mp, 0);
return (error);
out:
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(l, v, retval)
struct lwp *l;
void *v;
register_t *retval;
{
struct sys_getdents_args /* {
syscallarg(int) fd;
syscallarg(char *) buf;
syscallarg(size_t) count;
} */ *uap = v;
struct proc *p = l->l_proc;
struct file *fp;
int error, done;
/* getvnode() will use the descriptor for us */
if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0)
return (error);
if ((fp->f_flag & FREAD) == 0) {
error = EBADF;
goto out;
}
error = vn_readdir(fp, SCARG(uap, buf), UIO_USERSPACE,
SCARG(uap, count), &done, p, 0, 0);
#ifdef KTRACE
if (!error && KTRPOINT(p, KTR_GENIO)) {
struct iovec iov;
iov.iov_base = SCARG(uap, buf);
iov.iov_len = done;
ktrgenio(p, SCARG(uap, fd), UIO_READ, &iov, done, 0);
}
#endif
*retval = done;
out:
FILE_UNUSE(fp, p);
return (error);
}
/*
* Set the mode mask for creation of filesystem nodes.
*/
int
sys_umask(l, v, retval)
struct lwp *l;
void *v;
register_t *retval;
{
struct sys_umask_args /* {
syscallarg(mode_t) newmask;
} */ *uap = v;
struct proc *p = l->l_proc;
struct cwdinfo *cwdi;
cwdi = p->p_cwdi;
*retval = cwdi->cwdi_cmask;
cwdi->cwdi_cmask = SCARG(uap, newmask) & ALLPERMS;
return (0);
}
/*
* Void all references to file by ripping underlying filesystem
* away from vnode.
*/
/* ARGSUSED */
int
sys_revoke(l, v, retval)
struct lwp *l;
void *v;
register_t *retval;
{
struct sys_revoke_args /* {
syscallarg(const char *) path;
} */ *uap = v;
struct proc *p = l->l_proc;
struct mount *mp;
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 ((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 ((error = vn_start_write(vp, &mp, V_WAIT | V_PCATCH)) != 0)
goto out;
if (vp->v_usecount > 1 || (vp->v_flag & (VALIASED | VLAYER)))
VOP_REVOKE(vp, REVOKEALL);
vn_finished_write(mp, 0);
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 ((fp = fd_getfile(fdp, fd)) == NULL)
return (EBADF);
FILE_USE(fp);
if (fp->f_type != DTYPE_VNODE) {
FILE_UNUSE(fp, NULL);
return (EINVAL);
}
vp = (struct vnode *)fp->f_data;
if (vp->v_type == VBAD) {
FILE_UNUSE(fp, NULL);
return (EBADF);
}
*fpp = fp;
return (0);
}
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