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NetBSD/sys/kern/vfs_syscalls.c

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/* $NetBSD: vfs_syscalls.c,v 1.408 2010/08/21 13:19:39 pgoyette Exp $ */
/*-
* Copyright (c) 2008, 2009 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Andrew Doran.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
*/
/*
* 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 1.408 2010/08/21 13:19:39 pgoyette Exp $");
#ifdef _KERNEL_OPT
#include "opt_fileassoc.h"
#include "veriexec.h"
#endif
#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/kmem.h>
#include <sys/dirent.h>
#include <sys/sysctl.h>
#include <sys/syscallargs.h>
#include <sys/vfs_syscalls.h>
#include <sys/ktrace.h>
#ifdef FILEASSOC
#include <sys/fileassoc.h>
#endif /* FILEASSOC */
#include <sys/verified_exec.h>
#include <sys/kauth.h>
#include <sys/atomic.h>
#include <sys/module.h>
#include <sys/buf.h>
#include <miscfs/genfs/genfs.h>
#include <miscfs/syncfs/syncfs.h>
#include <miscfs/specfs/specdev.h>
#include <nfs/rpcv2.h>
#include <nfs/nfsproto.h>
#include <nfs/nfs.h>
#include <nfs/nfs_var.h>
MALLOC_DEFINE(M_MOUNT, "mount", "vfs mount struct");
static int change_flags(struct vnode *, u_long, struct lwp *);
static int change_mode(struct vnode *, int, struct lwp *l);
static int change_owner(struct vnode *, uid_t, gid_t, struct lwp *, int);
void checkdirs(struct vnode *);
/*
* Virtual File System System Calls
*/
/*
* Mount a file system.
*/
/*
* This table is used to maintain compatibility with 4.3BSD
* and NetBSD 0.9 mount syscalls - and possibly other systems.
* 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]);
static int
mount_update(struct lwp *l, struct vnode *vp, const char *path, int flags,
void *data, size_t *data_len)
{
struct mount *mp;
int error = 0, saved_flags;
mp = vp->v_mount;
saved_flags = mp->mnt_flag;
/* We can operate only on VV_ROOT nodes. */
if ((vp->v_vflag & VV_ROOT) == 0) {
error = EINVAL;
goto out;
}
/*
* We only allow the filesystem to be reloaded if it
* is currently mounted read-only. Additionally, we
* prevent read-write to read-only downgrades.
*/
if ((flags & (MNT_RELOAD | MNT_RDONLY)) != 0 &&
(mp->mnt_flag & MNT_RDONLY) == 0) {
error = EOPNOTSUPP; /* Needs translation */
goto out;
}
error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_MOUNT,
KAUTH_REQ_SYSTEM_MOUNT_UPDATE, mp, KAUTH_ARG(flags), data);
if (error)
goto out;
if (vfs_busy(mp, NULL)) {
error = EPERM;
goto out;
}
mutex_enter(&mp->mnt_updating);
mp->mnt_flag &= ~MNT_OP_FLAGS;
mp->mnt_flag |= flags & (MNT_RELOAD | MNT_FORCE | MNT_UPDATE);
/*
* Set the mount level flags.
*/
if (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 |
MNT_LOG);
mp->mnt_flag |= flags &
(MNT_NOSUID | MNT_NOEXEC | MNT_NODEV |
MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | MNT_NOCOREDUMP |
MNT_NOATIME | MNT_NODEVMTIME | MNT_SYMPERM | MNT_SOFTDEP |
MNT_LOG | MNT_IGNORE);
error = VFS_MOUNT(mp, path, data, data_len);
if (error && data != NULL) {
int error2;
/*
* Update failed; let's try and see if it was an
* export request. For compat with 3.0 and earlier.
*/
error2 = vfs_hooks_reexport(mp, path, data);
/*
* Only update error code if the export request was
* understood but some problem occurred while
* processing it.
*/
if (error2 != EJUSTRETURN)
error = error2;
}
if (mp->mnt_iflag & IMNT_WANTRDWR)
mp->mnt_flag &= ~MNT_RDONLY;
if (error)
mp->mnt_flag = saved_flags;
mp->mnt_flag &= ~MNT_OP_FLAGS;
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);
}
mutex_exit(&mp->mnt_updating);
vfs_unbusy(mp, false, NULL);
out:
return (error);
}
static int
mount_get_vfsops(const char *fstype, struct vfsops **vfsops)
{
char fstypename[sizeof(((struct statvfs *)NULL)->f_fstypename)];
int error;
/* Copy file-system type from userspace. */
error = copyinstr(fstype, fstypename, sizeof(fstypename), NULL);
if (error) {
/*
* Historically, filesystem types were identified by numbers.
* 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)fstype;
if (fsindex >= nmountcompatnames ||
mountcompatnames[fsindex] == NULL)
return ENODEV;
strlcpy(fstypename, mountcompatnames[fsindex],
sizeof(fstypename));
}
/* Accept `ufs' as an alias for `ffs', for compatibility. */
if (strcmp(fstypename, "ufs") == 0)
fstypename[0] = 'f';
if ((*vfsops = vfs_getopsbyname(fstypename)) != NULL)
return 0;
/* If we can autoload a vfs module, try again */
(void)module_autoload(fstypename, MODULE_CLASS_VFS);
if ((*vfsops = vfs_getopsbyname(fstypename)) != NULL)
return 0;
return ENODEV;
}
static int
mount_domount(struct lwp *l, struct vnode **vpp, struct vfsops *vfsops,
const char *path, int flags, void *data, size_t *data_len)
{
struct mount *mp;
struct vnode *vp = *vpp;
struct vattr va;
struct nameidata nd;
int error;
error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_MOUNT,
KAUTH_REQ_SYSTEM_MOUNT_NEW, vp, KAUTH_ARG(flags), data);
if (error) {
vfs_delref(vfsops);
return error;
}
/* Can't make a non-dir a mount-point (from here anyway). */
if (vp->v_type != VDIR) {
vfs_delref(vfsops);
return ENOTDIR;
}
/*
* 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, l->l_cred)) != 0 ||
(va.va_uid != kauth_cred_geteuid(l->l_cred) &&
(error = kauth_authorize_generic(l->l_cred,
KAUTH_GENERIC_ISSUSER, NULL)) != 0)) {
vfs_delref(vfsops);
return error;
}
if (flags & MNT_EXPORTED) {
vfs_delref(vfsops);
return EINVAL;
}
if ((mp = vfs_mountalloc(vfsops, vp)) == NULL) {
vfs_delref(vfsops);
return ENOMEM;
}
mp->mnt_stat.f_owner = kauth_cred_geteuid(l->l_cred);
/*
* The underlying file system may refuse the mount for
* various reasons. Allow the user to force it to happen.
*
* Set the mount level flags.
*/
mp->mnt_flag = flags &
(MNT_FORCE | MNT_NOSUID | MNT_NOEXEC | MNT_NODEV |
MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | MNT_NOCOREDUMP |
MNT_NOATIME | MNT_NODEVMTIME | MNT_SYMPERM | MNT_SOFTDEP |
MNT_LOG | MNT_IGNORE | MNT_RDONLY);
mutex_enter(&mp->mnt_updating);
error = VFS_MOUNT(mp, path, data, data_len);
mp->mnt_flag &= ~MNT_OP_FLAGS;
if (error != 0)
goto err_unmounted;
/*
* Validate and prepare the mount point.
*/
NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | TRYEMULROOT,
UIO_USERSPACE, path);
error = namei(&nd);
if (error != 0) {
goto err_mounted;
}
if (nd.ni_vp != vp) {
vput(nd.ni_vp);
error = EINVAL;
goto err_mounted;
}
if (vp->v_mountedhere != NULL) {
vput(nd.ni_vp);
error = EBUSY;
goto err_mounted;
}
error = vinvalbuf(vp, V_SAVE, l->l_cred, l, 0, 0);
if (error != 0) {
vput(nd.ni_vp);
goto err_mounted;
}
/*
* Put the new filesystem on the mount list after root.
*/
cache_purge(vp);
mp->mnt_iflag &= ~IMNT_WANTRDWR;
mutex_enter(&mountlist_lock);
CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list);
mutex_exit(&mountlist_lock);
if ((mp->mnt_flag & (MNT_RDONLY | MNT_ASYNC)) == 0)
error = vfs_allocate_syncvnode(mp);
if (error == 0)
vp->v_mountedhere = mp;
vput(nd.ni_vp);
if (error != 0)
goto err_onmountlist;
checkdirs(vp);
mutex_exit(&mp->mnt_updating);
/* Hold an additional reference to the mount across VFS_START(). */
vfs_unbusy(mp, true, NULL);
(void) VFS_STATVFS(mp, &mp->mnt_stat);
error = VFS_START(mp, 0);
if (error)
vrele(vp);
/* Drop reference held for VFS_START(). */
vfs_destroy(mp);
*vpp = NULL;
return error;
err_onmountlist:
mutex_enter(&mountlist_lock);
CIRCLEQ_REMOVE(&mountlist, mp, mnt_list);
mp->mnt_iflag |= IMNT_GONE;
mutex_exit(&mountlist_lock);
err_mounted:
if (VFS_UNMOUNT(mp, MNT_FORCE) != 0)
panic("Unmounting fresh file system failed");
err_unmounted:
vp->v_mountedhere = NULL;
mutex_exit(&mp->mnt_updating);
vfs_unbusy(mp, false, NULL);
vfs_destroy(mp);
return error;
}
static int
mount_getargs(struct lwp *l, struct vnode *vp, const char *path, int flags,
void *data, size_t *data_len)
{
struct mount *mp;
int error;
/* If MNT_GETARGS is specified, it should be the only flag. */
if (flags & ~MNT_GETARGS)
return EINVAL;
mp = vp->v_mount;
/* XXX: probably some notion of "can see" here if we want isolation. */
error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_MOUNT,
KAUTH_REQ_SYSTEM_MOUNT_GET, mp, data, NULL);
if (error)
return error;
if ((vp->v_vflag & VV_ROOT) == 0)
return EINVAL;
if (vfs_busy(mp, NULL))
return EPERM;
mutex_enter(&mp->mnt_updating);
mp->mnt_flag &= ~MNT_OP_FLAGS;
mp->mnt_flag |= MNT_GETARGS;
error = VFS_MOUNT(mp, path, data, data_len);
mp->mnt_flag &= ~MNT_OP_FLAGS;
mutex_exit(&mp->mnt_updating);
vfs_unbusy(mp, false, NULL);
return (error);
}
int
sys___mount50(struct lwp *l, const struct sys___mount50_args *uap, register_t *retval)
{
/* {
syscallarg(const char *) type;
syscallarg(const char *) path;
syscallarg(int) flags;
syscallarg(void *) data;
syscallarg(size_t) data_len;
} */
return do_sys_mount(l, NULL, SCARG(uap, type), SCARG(uap, path),
SCARG(uap, flags), SCARG(uap, data), UIO_USERSPACE,
SCARG(uap, data_len), retval);
}
int
do_sys_mount(struct lwp *l, struct vfsops *vfsops, const char *type,
const char *path, int flags, void *data, enum uio_seg data_seg,
size_t data_len, register_t *retval)
{
struct vnode *vp;
void *data_buf = data;
bool vfsopsrele = false;
int error;
/* XXX: The calling convention of this routine is totally bizarre */
if (vfsops)
vfsopsrele = true;
/*
* Get vnode to be covered
*/
error = namei_simple_user(path, NSM_FOLLOW_TRYEMULROOT, &vp);
if (error != 0) {
vp = NULL;
goto done;
}
if (vfsops == NULL) {
if (flags & (MNT_GETARGS | MNT_UPDATE)) {
vfsops = vp->v_mount->mnt_op;
} else {
/* 'type' is userspace */
error = mount_get_vfsops(type, &vfsops);
if (error != 0)
goto done;
vfsopsrele = true;
}
}
if (data != NULL && data_seg == UIO_USERSPACE) {
if (data_len == 0) {
/* No length supplied, use default for filesystem */
data_len = vfsops->vfs_min_mount_data;
if (data_len > VFS_MAX_MOUNT_DATA) {
error = EINVAL;
goto done;
}
/*
* Hopefully a longer buffer won't make copyin() fail.
* For compatibility with 3.0 and earlier.
*/
if (flags & MNT_UPDATE
&& data_len < sizeof (struct mnt_export_args30))
data_len = sizeof (struct mnt_export_args30);
}
data_buf = kmem_alloc(data_len, KM_SLEEP);
/* NFS needs the buffer even for mnt_getargs .... */
error = copyin(data, data_buf, data_len);
if (error != 0)
goto done;
}
if (flags & MNT_GETARGS) {
if (data_len == 0) {
error = EINVAL;
goto done;
}
error = mount_getargs(l, vp, path, flags, data_buf, &data_len);
if (error != 0)
goto done;
if (data_seg == UIO_USERSPACE)
error = copyout(data_buf, data, data_len);
*retval = data_len;
} else if (flags & MNT_UPDATE) {
error = mount_update(l, vp, path, flags, data_buf, &data_len);
} else {
/* Locking is handled internally in mount_domount(). */
KASSERT(vfsopsrele == true);
error = mount_domount(l, &vp, vfsops, path, flags, data_buf,
&data_len);
vfsopsrele = false;
}
done:
if (vfsopsrele)
vfs_delref(vfsops);
if (vp != NULL) {
vrele(vp);
}
if (data_buf != data)
kmem_free(data_buf, data_len);
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(struct vnode *olddp)
{
struct cwdinfo *cwdi;
struct vnode *newdp, *rele1, *rele2;
struct proc *p;
bool retry;
if (olddp->v_usecount == 1)
return;
if (VFS_ROOT(olddp->v_mountedhere, &newdp))
panic("mount: lost mount");
do {
retry = false;
mutex_enter(proc_lock);
PROCLIST_FOREACH(p, &allproc) {
if ((cwdi = p->p_cwdi) == NULL)
continue;
/*
* Can't change to the old directory any more,
* so even if we see a stale value it's not a
* problem.
*/
if (cwdi->cwdi_cdir != olddp &&
cwdi->cwdi_rdir != olddp)
continue;
retry = true;
rele1 = NULL;
rele2 = NULL;
atomic_inc_uint(&cwdi->cwdi_refcnt);
mutex_exit(proc_lock);
rw_enter(&cwdi->cwdi_lock, RW_WRITER);
if (cwdi->cwdi_cdir == olddp) {
rele1 = cwdi->cwdi_cdir;
vref(newdp);
cwdi->cwdi_cdir = newdp;
}
if (cwdi->cwdi_rdir == olddp) {
rele2 = cwdi->cwdi_rdir;
vref(newdp);
cwdi->cwdi_rdir = newdp;
}
rw_exit(&cwdi->cwdi_lock);
cwdfree(cwdi);
if (rele1 != NULL)
vrele(rele1);
if (rele2 != NULL)
vrele(rele2);
mutex_enter(proc_lock);
break;
}
mutex_exit(proc_lock);
} while (retry);
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(struct lwp *l, const struct sys_unmount_args *uap, register_t *retval)
{
/* {
syscallarg(const char *) path;
syscallarg(int) flags;
} */
struct vnode *vp;
struct mount *mp;
int error;
struct nameidata nd;
NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | TRYEMULROOT, UIO_USERSPACE,
SCARG(uap, path));
if ((error = namei(&nd)) != 0)
return (error);
vp = nd.ni_vp;
mp = vp->v_mount;
atomic_inc_uint(&mp->mnt_refcnt);
VOP_UNLOCK(vp);
error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_MOUNT,
KAUTH_REQ_SYSTEM_MOUNT_UNMOUNT, mp, NULL, NULL);
if (error) {
vrele(vp);
vfs_destroy(mp);
return (error);
}
/*
* Don't allow unmounting the root file system.
*/
if (mp->mnt_flag & MNT_ROOTFS) {
vrele(vp);
vfs_destroy(mp);
return (EINVAL);
}
/*
* Must be the root of the filesystem
*/
if ((vp->v_vflag & VV_ROOT) == 0) {
vrele(vp);
vfs_destroy(mp);
return (EINVAL);
}
vrele(vp);
error = dounmount(mp, SCARG(uap, flags), l);
vfs_destroy(mp);
return error;
}
/*
* Do the actual file system unmount. File system is assumed to have
* been locked by the caller.
*
* => Caller hold reference to the mount, explicitly for dounmount().
*/
int
dounmount(struct mount *mp, int flags, struct lwp *l)
{
struct vnode *coveredvp;
int error;
int async;
int used_syncer;
#if NVERIEXEC > 0
error = veriexec_unmountchk(mp);
if (error)
return (error);
#endif /* NVERIEXEC > 0 */
/*
* XXX Freeze syncer. Must do this before locking the
* mount point. See dounmount() for details.
*/
mutex_enter(&syncer_mutex);
rw_enter(&mp->mnt_unmounting, RW_WRITER);
if ((mp->mnt_iflag & IMNT_GONE) != 0) {
rw_exit(&mp->mnt_unmounting);
mutex_exit(&syncer_mutex);
return ENOENT;
}
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 the syncer doesn't work
* like that.
*
* The caller of dounmount() must acquire syncer_mutex because
* the syncer itself acquires locks in syncer_mutex -> 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_mutex.
*/
if (used_syncer == 0)
mutex_exit(&syncer_mutex);
mp->mnt_iflag |= IMNT_UNMOUNT;
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);
error = 0;
if ((mp->mnt_flag & MNT_RDONLY) == 0) {
error = VFS_SYNC(mp, MNT_WAIT, l->l_cred);
}
vfs_scrubvnlist(mp);
if (error == 0 || (flags & MNT_FORCE))
error = VFS_UNMOUNT(mp, flags);
if (error) {
if ((mp->mnt_flag & (MNT_RDONLY | MNT_ASYNC)) == 0)
(void) vfs_allocate_syncvnode(mp);
mp->mnt_iflag &= ~IMNT_UNMOUNT;
mp->mnt_flag |= async;
rw_exit(&mp->mnt_unmounting);
if (used_syncer)
mutex_exit(&syncer_mutex);
return (error);
}
vfs_scrubvnlist(mp);
mutex_enter(&mountlist_lock);
if ((coveredvp = mp->mnt_vnodecovered) != NULLVP)
coveredvp->v_mountedhere = NULL;
CIRCLEQ_REMOVE(&mountlist, mp, mnt_list);
mp->mnt_iflag |= IMNT_GONE;
mutex_exit(&mountlist_lock);
if (TAILQ_FIRST(&mp->mnt_vnodelist) != NULL)
panic("unmount: dangling vnode");
if (used_syncer)
mutex_exit(&syncer_mutex);
vfs_hooks_unmount(mp);
rw_exit(&mp->mnt_unmounting);
vfs_destroy(mp); /* reference from mount() */
if (coveredvp != NULLVP)
vrele(coveredvp);
return (0);
}
/*
* Sync each mounted filesystem.
*/
#ifdef DEBUG
int syncprt = 0;
struct ctldebug debug0 = { "syncprt", &syncprt };
#endif
/* ARGSUSED */
int
sys_sync(struct lwp *l, const void *v, register_t *retval)
{
struct mount *mp, *nmp;
int asyncflag;
if (l == NULL)
l = &lwp0;
mutex_enter(&mountlist_lock);
for (mp = CIRCLEQ_FIRST(&mountlist); mp != (void *)&mountlist;
mp = nmp) {
if (vfs_busy(mp, &nmp)) {
continue;
}
mutex_enter(&mp->mnt_updating);
if ((mp->mnt_flag & MNT_RDONLY) == 0) {
asyncflag = mp->mnt_flag & MNT_ASYNC;
mp->mnt_flag &= ~MNT_ASYNC;
VFS_SYNC(mp, MNT_NOWAIT, l->l_cred);
if (asyncflag)
mp->mnt_flag |= MNT_ASYNC;
}
mutex_exit(&mp->mnt_updating);
vfs_unbusy(mp, false, &nmp);
}
mutex_exit(&mountlist_lock);
#ifdef DEBUG
if (syncprt)
vfs_bufstats();
#endif /* DEBUG */
return (0);
}
/*
* Change filesystem quotas.
*/
/* ARGSUSED */
int
sys_quotactl(struct lwp *l, const struct sys_quotactl_args *uap, register_t *retval)
{
/* {
syscallarg(const char *) path;
syscallarg(int) cmd;
syscallarg(int) uid;
syscallarg(void *) arg;
} */
struct mount *mp;
int error;
struct vnode *vp;
error = namei_simple_user(SCARG(uap, path),
NSM_FOLLOW_TRYEMULROOT, &vp);
if (error != 0)
return (error);
mp = vp->v_mount;
error = VFS_QUOTACTL(mp, SCARG(uap, cmd), SCARG(uap, uid),
SCARG(uap, arg));
vrele(vp);
return (error);
}
int
dostatvfs(struct mount *mp, struct statvfs *sp, struct lwp *l, int flags,
int root)
{
struct cwdinfo *cwdi = l->l_proc->p_cwdi;
int error = 0;
/*
* If MNT_NOWAIT or MNT_LAZY is specified, do not
* refresh the fsstat cache. MNT_WAIT or MNT_LAZY
* overrides MNT_NOWAIT.
*/
if (flags == MNT_NOWAIT || flags == MNT_LAZY ||
(flags != MNT_WAIT && flags != 0)) {
memcpy(sp, &mp->mnt_stat, sizeof(*sp));
goto done;
}
/* Get the filesystem stats now */
memset(sp, 0, sizeof(*sp));
if ((error = VFS_STATVFS(mp, sp)) != 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 c;
char *path = PNBUF_GET();
bp = path + MAXPATHLEN;
*--bp = '\0';
rw_enter(&cwdi->cwdi_lock, RW_READER);
error = getcwd_common(cwdi->cwdi_rdir, rootvnode, &bp, path,
MAXPATHLEN / 2, 0, l);
rw_exit(&cwdi->cwdi_lock);
if (error) {
PNBUF_PUT(path);
return error;
}
len = strlen(bp);
if (len != 1) {
/*
* 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 &&
((c = sp->f_mntonname[len]) == '/' || c == '\0')) {
(void)strlcpy(sp->f_mntonname,
c == '\0' ? "/" : &sp->f_mntonname[len],
sizeof(sp->f_mntonname));
} else {
if (root)
(void)strlcpy(sp->f_mntonname, "/",
sizeof(sp->f_mntonname));
else
error = EPERM;
}
}
PNBUF_PUT(path);
}
sp->f_flag = mp->mnt_flag & MNT_VISFLAGMASK;
return error;
}
/*
* Get filesystem statistics by path.
*/
int
do_sys_pstatvfs(struct lwp *l, const char *path, int flags, struct statvfs *sb)
{
struct mount *mp;
int error;
struct vnode *vp;
error = namei_simple_user(path, NSM_FOLLOW_TRYEMULROOT, &vp);
if (error != 0)
return error;
mp = vp->v_mount;
error = dostatvfs(mp, sb, l, flags, 1);
vrele(vp);
return error;
}
/* ARGSUSED */
int
sys_statvfs1(struct lwp *l, const struct sys_statvfs1_args *uap, register_t *retval)
{
/* {
syscallarg(const char *) path;
syscallarg(struct statvfs *) buf;
syscallarg(int) flags;
} */
struct statvfs *sb;
int error;
sb = STATVFSBUF_GET();
error = do_sys_pstatvfs(l, SCARG(uap, path), SCARG(uap, flags), sb);
if (error == 0)
error = copyout(sb, SCARG(uap, buf), sizeof(*sb));
STATVFSBUF_PUT(sb);
return error;
}
/*
* Get filesystem statistics by fd.
*/
int
do_sys_fstatvfs(struct lwp *l, int fd, int flags, struct statvfs *sb)
{
file_t *fp;
struct mount *mp;
int error;
/* fd_getvnode() will use the descriptor for us */
if ((error = fd_getvnode(fd, &fp)) != 0)
return (error);
mp = ((struct vnode *)fp->f_data)->v_mount;
error = dostatvfs(mp, sb, curlwp, flags, 1);
fd_putfile(fd);
return error;
}
/* ARGSUSED */
int
sys_fstatvfs1(struct lwp *l, const struct sys_fstatvfs1_args *uap, register_t *retval)
{
/* {
syscallarg(int) fd;
syscallarg(struct statvfs *) buf;
syscallarg(int) flags;
} */
struct statvfs *sb;
int error;
sb = STATVFSBUF_GET();
error = do_sys_fstatvfs(l, SCARG(uap, fd), SCARG(uap, flags), sb);
if (error == 0)
error = copyout(sb, SCARG(uap, buf), sizeof(*sb));
STATVFSBUF_PUT(sb);
return error;
}
/*
* Get statistics on all filesystems.
*/
int
do_sys_getvfsstat(struct lwp *l, void *sfsp, size_t bufsize, int flags,
int (*copyfn)(const void *, void *, size_t), size_t entry_sz,
register_t *retval)
{
int root = 0;
struct proc *p = l->l_proc;
struct mount *mp, *nmp;
struct statvfs *sb;
size_t count, maxcount;
int error = 0;
sb = STATVFSBUF_GET();
maxcount = bufsize / entry_sz;
mutex_enter(&mountlist_lock);
count = 0;
for (mp = CIRCLEQ_FIRST(&mountlist); mp != (void *)&mountlist;
mp = nmp) {
if (vfs_busy(mp, &nmp)) {
continue;
}
if (sfsp && count < maxcount) {
error = dostatvfs(mp, sb, l, flags, 0);
if (error) {
vfs_unbusy(mp, false, &nmp);
error = 0;
continue;
}
error = copyfn(sb, sfsp, entry_sz);
if (error) {
vfs_unbusy(mp, false, NULL);
goto out;
}
sfsp = (char *)sfsp + entry_sz;
root |= strcmp(sb->f_mntonname, "/") == 0;
}
count++;
vfs_unbusy(mp, false, &nmp);
}
mutex_exit(&mountlist_lock);
if (root == 0 && p->p_cwdi->cwdi_rdir) {
/*
* fake a root entry
*/
error = dostatvfs(p->p_cwdi->cwdi_rdir->v_mount,
sb, l, flags, 1);
if (error != 0)
goto out;
if (sfsp) {
error = copyfn(sb, sfsp, entry_sz);
if (error != 0)
goto out;
}
count++;
}
if (sfsp && count > maxcount)
*retval = maxcount;
else
*retval = count;
out:
STATVFSBUF_PUT(sb);
return error;
}
int
sys_getvfsstat(struct lwp *l, const struct sys_getvfsstat_args *uap, register_t *retval)
{
/* {
syscallarg(struct statvfs *) buf;
syscallarg(size_t) bufsize;
syscallarg(int) flags;
} */
return do_sys_getvfsstat(l, SCARG(uap, buf), SCARG(uap, bufsize),
SCARG(uap, flags), copyout, sizeof (struct statvfs), retval);
}
/*
* Change current working directory to a given file descriptor.
*/
/* ARGSUSED */
int
sys_fchdir(struct lwp *l, const struct sys_fchdir_args *uap, register_t *retval)
{
/* {
syscallarg(int) fd;
} */
struct proc *p = l->l_proc;
struct cwdinfo *cwdi;
struct vnode *vp, *tdp;
struct mount *mp;
file_t *fp;
int error, fd;
/* fd_getvnode() will use the descriptor for us */
fd = SCARG(uap, fd);
if ((error = fd_getvnode(fd, &fp)) != 0)
return (error);
vp = 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, l->l_cred);
if (error) {
vput(vp);
goto out;
}
while ((mp = vp->v_mountedhere) != NULL) {
error = vfs_busy(mp, NULL);
vput(vp);
if (error != 0)
goto out;
error = VFS_ROOT(mp, &tdp);
vfs_unbusy(mp, false, NULL);
if (error)
goto out;
vp = tdp;
}
VOP_UNLOCK(vp);
/*
* Disallow changing to a directory not under the process's
* current root directory (if there is one).
*/
cwdi = p->p_cwdi;
rw_enter(&cwdi->cwdi_lock, RW_WRITER);
if (cwdi->cwdi_rdir && !vn_isunder(vp, NULL, l)) {
vrele(vp);
error = EPERM; /* operation not permitted */
} else {
vrele(cwdi->cwdi_cdir);
cwdi->cwdi_cdir = vp;
}
rw_exit(&cwdi->cwdi_lock);
out:
fd_putfile(fd);
return (error);
}
/*
* Change this process's notion of the root directory to a given file
* descriptor.
*/
int
sys_fchroot(struct lwp *l, const struct sys_fchroot_args *uap, register_t *retval)
{
struct proc *p = l->l_proc;
struct vnode *vp;
file_t *fp;
int error, fd = SCARG(uap, fd);
if ((error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_CHROOT,
KAUTH_REQ_SYSTEM_CHROOT_FCHROOT, NULL, NULL, NULL)) != 0)
return error;
/* fd_getvnode() will use the descriptor for us */
if ((error = fd_getvnode(fd, &fp)) != 0)
return error;
vp = fp->f_data;
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
if (vp->v_type != VDIR)
error = ENOTDIR;
else
error = VOP_ACCESS(vp, VEXEC, l->l_cred);
VOP_UNLOCK(vp);
if (error)
goto out;
vref(vp);
change_root(p->p_cwdi, vp, l);
out:
fd_putfile(fd);
return (error);
}
/*
* Change current working directory (``.'').
*/
/* ARGSUSED */
int
sys_chdir(struct lwp *l, const struct sys_chdir_args *uap, register_t *retval)
{
/* {
syscallarg(const char *) path;
} */
struct proc *p = l->l_proc;
struct cwdinfo *cwdi;
int error;
struct vnode *vp;
if ((error = chdir_lookup(SCARG(uap, path), UIO_USERSPACE,
&vp, l)) != 0)
return (error);
cwdi = p->p_cwdi;
rw_enter(&cwdi->cwdi_lock, RW_WRITER);
vrele(cwdi->cwdi_cdir);
cwdi->cwdi_cdir = vp;
rw_exit(&cwdi->cwdi_lock);
return (0);
}
/*
* Change notion of root (``/'') directory.
*/
/* ARGSUSED */
int
sys_chroot(struct lwp *l, const struct sys_chroot_args *uap, register_t *retval)
{
/* {
syscallarg(const char *) path;
} */
struct proc *p = l->l_proc;
int error;
struct vnode *vp;
if ((error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_CHROOT,
KAUTH_REQ_SYSTEM_CHROOT_CHROOT, NULL, NULL, NULL)) != 0)
return (error);
if ((error = chdir_lookup(SCARG(uap, path), UIO_USERSPACE,
&vp, l)) != 0)
return (error);
change_root(p->p_cwdi, vp, l);
return (0);
}
/*
* Common routine for chroot and fchroot.
* NB: callers need to properly authorize the change root operation.
*/
void
change_root(struct cwdinfo *cwdi, struct vnode *vp, struct lwp *l)
{
rw_enter(&cwdi->cwdi_lock, RW_WRITER);
if (cwdi->cwdi_rdir != NULL)
vrele(cwdi->cwdi_rdir);
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, l)) {
/*
* XXX would be more failsafe to change directory to a
* deadfs node here instead
*/
vrele(cwdi->cwdi_cdir);
vref(vp);
cwdi->cwdi_cdir = vp;
}
rw_exit(&cwdi->cwdi_lock);
}
/*
* Common routine for chroot and chdir.
*/
int
chdir_lookup(const char *path, int where, struct vnode **vpp, struct lwp *l)
{
struct nameidata nd;
int error;
NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | TRYEMULROOT, where,
path);
if ((error = namei(&nd)) != 0)
return (error);
*vpp = nd.ni_vp;
if ((*vpp)->v_type != VDIR)
error = ENOTDIR;
else
error = VOP_ACCESS(*vpp, VEXEC, l->l_cred);
if (error)
vput(*vpp);
else
VOP_UNLOCK(*vpp);
return (error);
}
/*
* Check permissions, allocate an open file structure,
* and call the device open routine if any.
*/
int
sys_open(struct lwp *l, const struct sys_open_args *uap, register_t *retval)
{
/* {
syscallarg(const char *) path;
syscallarg(int) flags;
syscallarg(int) mode;
} */
struct proc *p = l->l_proc;
struct cwdinfo *cwdi = p->p_cwdi;
file_t *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);
if ((error = fd_allocfile(&fp, &indx)) != 0)
return (error);
/* We're going to read cwdi->cwdi_cmask unlocked here. */
cmode = ((SCARG(uap, mode) &~ cwdi->cwdi_cmask) & ALLPERMS) &~ S_ISTXT;
NDINIT(&nd, LOOKUP, FOLLOW | TRYEMULROOT, UIO_USERSPACE,
SCARG(uap, path));
l->l_dupfd = -indx - 1; /* XXX check for fdopen */
if ((error = vn_open(&nd, flags, cmode)) != 0) {
fd_abort(p, fp, indx);
if ((error == EDUPFD || error == EMOVEFD) &&
l->l_dupfd >= 0 && /* XXX from fdopen */
(error =
fd_dupopen(l->l_dupfd, &indx, flags, error)) == 0) {
*retval = indx;
return (0);
}
if (error == ERESTART)
error = EINTR;
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);
error = VOP_ADVLOCK(vp, fp, F_SETLK, &lf, type);
if (error) {
(void) vn_close(vp, fp->f_flag, fp->f_cred);
fd_abort(p, fp, indx);
return (error);
}
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
atomic_or_uint(&fp->f_flag, FHASLOCK);
}
VOP_UNLOCK(vp);
*retval = indx;
fd_affix(p, fp, indx);
return (0);
}
static void
vfs__fhfree(fhandle_t *fhp)
{
size_t fhsize;
if (fhp == NULL) {
return;
}
fhsize = FHANDLE_SIZE(fhp);
kmem_free(fhp, fhsize);
}
/*
* vfs_composefh: compose a filehandle.
*/
int
vfs_composefh(struct vnode *vp, fhandle_t *fhp, size_t *fh_size)
{
struct mount *mp;
struct fid *fidp;
int error;
size_t needfhsize;
size_t fidsize;
mp = vp->v_mount;
fidp = NULL;
if (*fh_size < FHANDLE_SIZE_MIN) {
fidsize = 0;
} else {
fidsize = *fh_size - offsetof(fhandle_t, fh_fid);
if (fhp != NULL) {
memset(fhp, 0, *fh_size);
fhp->fh_fsid = mp->mnt_stat.f_fsidx;
fidp = &fhp->fh_fid;
}
}
error = VFS_VPTOFH(vp, fidp, &fidsize);
needfhsize = FHANDLE_SIZE_FROM_FILEID_SIZE(fidsize);
if (error == 0 && *fh_size < needfhsize) {
error = E2BIG;
}
*fh_size = needfhsize;
return error;
}
int
vfs_composefh_alloc(struct vnode *vp, fhandle_t **fhpp)
{
struct mount *mp;
fhandle_t *fhp;
size_t fhsize;
size_t fidsize;
int error;
*fhpp = NULL;
mp = vp->v_mount;
fidsize = 0;
error = VFS_VPTOFH(vp, NULL, &fidsize);
KASSERT(error != 0);
if (error != E2BIG) {
goto out;
}
fhsize = FHANDLE_SIZE_FROM_FILEID_SIZE(fidsize);
fhp = kmem_zalloc(fhsize, KM_SLEEP);
if (fhp == NULL) {
error = ENOMEM;
goto out;
}
fhp->fh_fsid = mp->mnt_stat.f_fsidx;
error = VFS_VPTOFH(vp, &fhp->fh_fid, &fidsize);
if (error == 0) {
KASSERT((FHANDLE_SIZE(fhp) == fhsize &&
FHANDLE_FILEID(fhp)->fid_len == fidsize));
*fhpp = fhp;
} else {
kmem_free(fhp, fhsize);
}
out:
return error;
}
void
vfs_composefh_free(fhandle_t *fhp)
{
vfs__fhfree(fhp);
}
/*
* vfs_fhtovp: lookup a vnode by a filehandle.
*/
int
vfs_fhtovp(fhandle_t *fhp, struct vnode **vpp)
{
struct mount *mp;
int error;
*vpp = NULL;
mp = vfs_getvfs(FHANDLE_FSID(fhp));
if (mp == NULL) {
error = ESTALE;
goto out;
}
if (mp->mnt_op->vfs_fhtovp == NULL) {
error = EOPNOTSUPP;
goto out;
}
error = VFS_FHTOVP(mp, FHANDLE_FILEID(fhp), vpp);
out:
return error;
}
/*
* vfs_copyinfh_alloc: allocate and copyin a filehandle, given
* the needed size.
*/
int
vfs_copyinfh_alloc(const void *ufhp, size_t fhsize, fhandle_t **fhpp)
{
fhandle_t *fhp;
int error;
*fhpp = NULL;
if (fhsize > FHANDLE_SIZE_MAX) {
return EINVAL;
}
if (fhsize < FHANDLE_SIZE_MIN) {
return EINVAL;
}
again:
fhp = kmem_alloc(fhsize, KM_SLEEP);
if (fhp == NULL) {
return ENOMEM;
}
error = copyin(ufhp, fhp, fhsize);
if (error == 0) {
/* XXX this check shouldn't be here */
if (FHANDLE_SIZE(fhp) == fhsize) {
*fhpp = fhp;
return 0;
} else if (fhsize == NFSX_V2FH && FHANDLE_SIZE(fhp) < fhsize) {
/*
* a kludge for nfsv2 padded handles.
*/
size_t sz;
sz = FHANDLE_SIZE(fhp);
kmem_free(fhp, fhsize);
fhsize = sz;
goto again;
} else {
/*
* userland told us wrong size.
*/
error = EINVAL;
}
}
kmem_free(fhp, fhsize);
return error;
}
void
vfs_copyinfh_free(fhandle_t *fhp)
{
vfs__fhfree(fhp);
}
/*
* Get file handle system call
*/
int
sys___getfh30(struct lwp *l, const struct sys___getfh30_args *uap, register_t *retval)
{
/* {
syscallarg(char *) fname;
syscallarg(fhandle_t *) fhp;
syscallarg(size_t *) fh_size;
} */
struct vnode *vp;
fhandle_t *fh;
int error;
struct nameidata nd;
size_t sz;
size_t usz;
/*
* Must be super user
*/
error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_FILEHANDLE,
0, NULL, NULL, NULL);
if (error)
return (error);
NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | TRYEMULROOT, UIO_USERSPACE,
SCARG(uap, fname));
error = namei(&nd);
if (error)
return (error);
vp = nd.ni_vp;
error = vfs_composefh_alloc(vp, &fh);
vput(vp);
if (error != 0) {
goto out;
}
error = copyin(SCARG(uap, fh_size), &usz, sizeof(size_t));
if (error != 0) {
goto out;
}
sz = FHANDLE_SIZE(fh);
error = copyout(&sz, SCARG(uap, fh_size), sizeof(size_t));
if (error != 0) {
goto out;
}
if (usz >= sz) {
error = copyout(fh, SCARG(uap, fhp), sz);
} else {
error = E2BIG;
}
out:
vfs_composefh_free(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
dofhopen(struct lwp *l, const void *ufhp, size_t fhsize, int oflags,
register_t *retval)
{
file_t *fp;
struct vnode *vp = NULL;
kauth_cred_t cred = l->l_cred;
file_t *nfp;
int type, indx, error=0;
struct flock lf;
struct vattr va;
fhandle_t *fh;
int flags;
proc_t *p;
p = curproc;
/*
* Must be super user
*/
if ((error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_FILEHANDLE,
0, NULL, NULL, NULL)))
return (error);
flags = FFLAGS(oflags);
if ((flags & (FREAD | FWRITE)) == 0)
return (EINVAL);
if ((flags & O_CREAT))
return (EINVAL);
if ((error = fd_allocfile(&nfp, &indx)) != 0)
return (error);
fp = nfp;
error = vfs_copyinfh_alloc(ufhp, fhsize, &fh);
if (error != 0) {
goto bad;
}
error = vfs_fhtovp(fh, &vp);
if (error != 0) {
goto bad;
}
/* Now do an effective vn_open */
if (vp->v_type == VSOCK) {
error = EOPNOTSUPP;
goto bad;
}
error = vn_openchk(vp, cred, flags);
if (error != 0)
goto bad;
if (flags & O_TRUNC) {
VOP_UNLOCK(vp); /* XXX */
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); /* XXX */
vattr_null(&va);
va.va_size = 0;
error = VOP_SETATTR(vp, &va, cred);
if (error)
goto bad;
}
if ((error = VOP_OPEN(vp, flags, cred)) != 0)
goto bad;
if (flags & FWRITE) {
mutex_enter(&vp->v_interlock);
vp->v_writecount++;
mutex_exit(&vp->v_interlock);
}
/* 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);
error = VOP_ADVLOCK(vp, fp, F_SETLK, &lf, type);
if (error) {
(void) vn_close(vp, fp->f_flag, fp->f_cred);
fd_abort(p, fp, indx);
return (error);
}
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
atomic_or_uint(&fp->f_flag, FHASLOCK);
}
VOP_UNLOCK(vp);
*retval = indx;
fd_affix(p, fp, indx);
vfs_copyinfh_free(fh);
return (0);
bad:
fd_abort(p, fp, indx);
if (vp != NULL)
vput(vp);
vfs_copyinfh_free(fh);
return (error);
}
int
sys___fhopen40(struct lwp *l, const struct sys___fhopen40_args *uap, register_t *retval)
{
/* {
syscallarg(const void *) fhp;
syscallarg(size_t) fh_size;
syscallarg(int) flags;
} */
return dofhopen(l, SCARG(uap, fhp), SCARG(uap, fh_size),
SCARG(uap, flags), retval);
}
int
do_fhstat(struct lwp *l, const void *ufhp, size_t fhsize, struct stat *sb)
{
int error;
fhandle_t *fh;
struct vnode *vp;
/*
* Must be super user
*/
if ((error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_FILEHANDLE,
0, NULL, NULL, NULL)))
return (error);
error = vfs_copyinfh_alloc(ufhp, fhsize, &fh);
if (error != 0)
return error;
error = vfs_fhtovp(fh, &vp);
vfs_copyinfh_free(fh);
if (error != 0)
return error;
error = vn_stat(vp, sb);
vput(vp);
return error;
}
/* ARGSUSED */
int
sys___fhstat50(struct lwp *l, const struct sys___fhstat50_args *uap, register_t *retval)
{
/* {
syscallarg(const void *) fhp;
syscallarg(size_t) fh_size;
syscallarg(struct stat *) sb;
} */
struct stat sb;
int error;
error = do_fhstat(l, SCARG(uap, fhp), SCARG(uap, fh_size), &sb);
if (error)
return error;
return copyout(&sb, SCARG(uap, sb), sizeof(sb));
}
int
do_fhstatvfs(struct lwp *l, const void *ufhp, size_t fhsize, struct statvfs *sb,
int flags)
{
fhandle_t *fh;
struct mount *mp;
struct vnode *vp;
int error;
/*
* Must be super user
*/
if ((error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_FILEHANDLE,
0, NULL, NULL, NULL)))
return error;
error = vfs_copyinfh_alloc(ufhp, fhsize, &fh);
if (error != 0)
return error;
error = vfs_fhtovp(fh, &vp);
vfs_copyinfh_free(fh);
if (error != 0)
return error;
mp = vp->v_mount;
error = dostatvfs(mp, sb, l, flags, 1);
vput(vp);
return error;
}
/* ARGSUSED */
int
sys___fhstatvfs140(struct lwp *l, const struct sys___fhstatvfs140_args *uap, register_t *retval)
{
/* {
syscallarg(const void *) fhp;
syscallarg(size_t) fh_size;
syscallarg(struct statvfs *) buf;
syscallarg(int) flags;
} */
struct statvfs *sb = STATVFSBUF_GET();
int error;
error = do_fhstatvfs(l, SCARG(uap, fhp), SCARG(uap, fh_size), sb,
SCARG(uap, flags));
if (error == 0)
error = copyout(sb, SCARG(uap, buf), sizeof(*sb));
STATVFSBUF_PUT(sb);
return error;
}
/*
* Create a special file.
*/
/* ARGSUSED */
int
sys___mknod50(struct lwp *l, const struct sys___mknod50_args *uap,
register_t *retval)
{
/* {
syscallarg(const char *) path;
syscallarg(mode_t) mode;
syscallarg(dev_t) dev;
} */
return do_sys_mknod(l, SCARG(uap, path), SCARG(uap, mode),
SCARG(uap, dev), retval, UIO_USERSPACE);
}
int
do_sys_mknod(struct lwp *l, const char *pathname, mode_t mode, dev_t dev,
register_t *retval, enum uio_seg seg)
{
struct proc *p = l->l_proc;
struct vnode *vp;
struct vattr vattr;
int error, optype;
struct nameidata nd;
char *path;
const char *cpath;
if ((error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_MKNOD,
0, NULL, NULL, NULL)) != 0)
return (error);
optype = VOP_MKNOD_DESCOFFSET;
VERIEXEC_PATH_GET(pathname, seg, cpath, path);
NDINIT(&nd, CREATE, LOCKPARENT | TRYEMULROOT, seg, cpath);
if ((error = namei(&nd)) != 0)
goto out;
vp = nd.ni_vp;
if (vp != NULL)
error = EEXIST;
else {
vattr_null(&vattr);
/* We will read cwdi->cwdi_cmask unlocked. */
vattr.va_mode = (mode & ALLPERMS) &~ p->p_cwdi->cwdi_cmask;
vattr.va_rdev = dev;
switch (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:
optype = VOP_WHITEOUT_DESCOFFSET;
break;
case S_IFREG:
#if NVERIEXEC > 0
error = veriexec_openchk(l, nd.ni_vp, nd.ni_dirp,
O_CREAT);
#endif /* NVERIEXEC > 0 */
vattr.va_type = VREG;
vattr.va_rdev = VNOVAL;
optype = VOP_CREATE_DESCOFFSET;
break;
default:
error = EINVAL;
break;
}
}
if (!error) {
switch (optype) {
case VOP_WHITEOUT_DESCOFFSET:
error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, CREATE);
if (error)
VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd);
vput(nd.ni_dvp);
break;
case VOP_MKNOD_DESCOFFSET:
error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp,
&nd.ni_cnd, &vattr);
if (error == 0)
vput(nd.ni_vp);
break;
case VOP_CREATE_DESCOFFSET:
error = VOP_CREATE(nd.ni_dvp, &nd.ni_vp,
&nd.ni_cnd, &vattr);
if (error == 0)
vput(nd.ni_vp);
break;
}
} 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);
}
out:
VERIEXEC_PATH_PUT(path);
return (error);
}
/*
* Create a named pipe.
*/
/* ARGSUSED */
int
sys_mkfifo(struct lwp *l, const struct sys_mkfifo_args *uap, register_t *retval)
{
/* {
syscallarg(const char *) path;
syscallarg(int) mode;
} */
struct proc *p = l->l_proc;
struct vattr vattr;
int error;
struct nameidata nd;
NDINIT(&nd, CREATE, LOCKPARENT | TRYEMULROOT, UIO_USERSPACE,
SCARG(uap, path));
if ((error = namei(&nd)) != 0)
return (error);
if (nd.ni_vp != NULL) {
VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd);
if (nd.ni_dvp == nd.ni_vp)
vrele(nd.ni_dvp);
else
vput(nd.ni_dvp);
vrele(nd.ni_vp);
return (EEXIST);
}
vattr_null(&vattr);
vattr.va_type = VFIFO;
/* We will read cwdi->cwdi_cmask unlocked. */
vattr.va_mode = (SCARG(uap, mode) & ALLPERMS) &~ p->p_cwdi->cwdi_cmask;
error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr);
if (error == 0)
vput(nd.ni_vp);
return (error);
}
/*
* Make a hard file link.
*/
/* ARGSUSED */
int
sys_link(struct lwp *l, const struct sys_link_args *uap, register_t *retval)
{
/* {
syscallarg(const char *) path;
syscallarg(const char *) link;
} */
struct vnode *vp;
struct nameidata nd;
int error;
error = namei_simple_user(SCARG(uap, path),
NSM_FOLLOW_TRYEMULROOT, &vp);
if (error != 0)
return (error);
NDINIT(&nd, CREATE, LOCKPARENT | TRYEMULROOT, UIO_USERSPACE,
SCARG(uap, link));
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;
}
error = VOP_LINK(nd.ni_dvp, vp, &nd.ni_cnd);
out:
vrele(vp);
return (error);
}
int
do_sys_symlink(const char *patharg, const char *link, enum uio_seg seg)
{
struct proc *p = curproc;
struct vattr vattr;
char *path;
int error;
struct nameidata nd;
path = PNBUF_GET();
if (seg == UIO_USERSPACE) {
if ((error = copyinstr(patharg, path, MAXPATHLEN, NULL)) != 0)
goto out;
} else {
KASSERT(strlen(patharg) < MAXPATHLEN);
strcpy(path, patharg);
}
NDINIT(&nd, CREATE, LOCKPARENT | TRYEMULROOT, seg, link);
if ((error = namei(&nd)) != 0)
goto out;
if (nd.ni_vp) {
VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd);
if (nd.ni_dvp == nd.ni_vp)
vrele(nd.ni_dvp);
else
vput(nd.ni_dvp);
vrele(nd.ni_vp);
error = EEXIST;
goto out;
}
vattr_null(&vattr);
vattr.va_type = VLNK;
/* We will read cwdi->cwdi_cmask unlocked. */
vattr.va_mode = ACCESSPERMS &~ p->p_cwdi->cwdi_cmask;
error = VOP_SYMLINK(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr, path);
if (error == 0)
vput(nd.ni_vp);
out:
PNBUF_PUT(path);
return (error);
}
/*
* Make a symbolic link.
*/
/* ARGSUSED */
int
sys_symlink(struct lwp *l, const struct sys_symlink_args *uap, register_t *retval)
{
/* {
syscallarg(const char *) path;
syscallarg(const char *) link;
} */
return do_sys_symlink(SCARG(uap, path), SCARG(uap, link),
UIO_USERSPACE);
}
/*
* Delete a whiteout from the filesystem.
*/
/* ARGSUSED */
int
sys_undelete(struct lwp *l, const struct sys_undelete_args *uap, register_t *retval)
{
/* {
syscallarg(const char *) path;
} */
int error;
struct nameidata nd;
NDINIT(&nd, DELETE, LOCKPARENT | DOWHITEOUT | TRYEMULROOT,
UIO_USERSPACE, SCARG(uap, path));
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 ((error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, DELETE)) != 0)
VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd);
vput(nd.ni_dvp);
return (error);
}
/*
* Delete a name from the filesystem.
*/
/* ARGSUSED */
int
sys_unlink(struct lwp *l, const struct sys_unlink_args *uap, register_t *retval)
{
/* {
syscallarg(const char *) path;
} */
return do_sys_unlink(SCARG(uap, path), UIO_USERSPACE);
}
int
do_sys_unlink(const char *arg, enum uio_seg seg)
{
struct vnode *vp;
int error;
struct nameidata nd;
char *path;
const char *cpath;
VERIEXEC_PATH_GET(arg, seg, cpath, path);
NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF | TRYEMULROOT, seg, cpath);
if ((error = namei(&nd)) != 0)
goto out;
vp = nd.ni_vp;
/*
* The root of a mounted filesystem cannot be deleted.
*/
if (vp->v_vflag & VV_ROOT) {
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 NVERIEXEC > 0
/* Handle remove requests for veriexec entries. */
if ((error = veriexec_removechk(curlwp, nd.ni_vp, nd.ni_dirp)) != 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);
goto out;
}
#endif /* NVERIEXEC > 0 */
#ifdef FILEASSOC
(void)fileassoc_file_delete(vp);
#endif /* FILEASSOC */
error = VOP_REMOVE(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd);
out:
VERIEXEC_PATH_PUT(path);
return (error);
}
/*
* Reposition read/write file offset.
*/
int
sys_lseek(struct lwp *l, const struct sys_lseek_args *uap, register_t *retval)
{
/* {
syscallarg(int) fd;
syscallarg(int) pad;
syscallarg(off_t) offset;
syscallarg(int) whence;
} */
kauth_cred_t cred = l->l_cred;
file_t *fp;
struct vnode *vp;
struct vattr vattr;
off_t newoff;
int error, fd;
fd = SCARG(uap, fd);
if ((fp = fd_getfile(fd)) == NULL)
return (EBADF);
vp = 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);
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) {
*(off_t *)retval = fp->f_offset = newoff;
}
out:
fd_putfile(fd);
return (error);
}
/*
* Positional read system call.
*/
int
sys_pread(struct lwp *l, const struct sys_pread_args *uap, register_t *retval)
{
/* {
syscallarg(int) fd;
syscallarg(void *) buf;
syscallarg(size_t) nbyte;
syscallarg(off_t) offset;
} */
file_t *fp;
struct vnode *vp;
off_t offset;
int error, fd = SCARG(uap, fd);
if ((fp = fd_getfile(fd)) == NULL)
return (EBADF);
if ((fp->f_flag & FREAD) == 0) {
fd_putfile(fd);
return (EBADF);
}
vp = 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(fd, fp, SCARG(uap, buf), SCARG(uap, nbyte),
&offset, 0, retval));
out:
fd_putfile(fd);
return (error);
}
/*
* Positional scatter read system call.
*/
int
sys_preadv(struct lwp *l, const struct sys_preadv_args *uap, register_t *retval)
{
/* {
syscallarg(int) fd;
syscallarg(const struct iovec *) iovp;
syscallarg(int) iovcnt;
syscallarg(off_t) offset;
} */
off_t offset = SCARG(uap, offset);
return do_filereadv(SCARG(uap, fd), SCARG(uap, iovp),
SCARG(uap, iovcnt), &offset, 0, retval);
}
/*
* Positional write system call.
*/
int
sys_pwrite(struct lwp *l, const struct sys_pwrite_args *uap, register_t *retval)
{
/* {
syscallarg(int) fd;
syscallarg(const void *) buf;
syscallarg(size_t) nbyte;
syscallarg(off_t) offset;
} */
file_t *fp;
struct vnode *vp;
off_t offset;
int error, fd = SCARG(uap, fd);
if ((fp = fd_getfile(fd)) == NULL)
return (EBADF);
if ((fp->f_flag & FWRITE) == 0) {
fd_putfile(fd);
return (EBADF);
}
vp = 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(fd, fp, SCARG(uap, buf), SCARG(uap, nbyte),
&offset, 0, retval));
out:
fd_putfile(fd);
return (error);
}
/*
* Positional gather write system call.
*/
int
sys_pwritev(struct lwp *l, const struct sys_pwritev_args *uap, register_t *retval)
{
/* {
syscallarg(int) fd;
syscallarg(const struct iovec *) iovp;
syscallarg(int) iovcnt;
syscallarg(off_t) offset;
} */
off_t offset = SCARG(uap, offset);
return do_filewritev(SCARG(uap, fd), SCARG(uap, iovp),
SCARG(uap, iovcnt), &offset, 0, retval);
}
/*
* Check access permissions.
*/
int
sys_access(struct lwp *l, const struct sys_access_args *uap, register_t *retval)
{
/* {
syscallarg(const char *) path;
syscallarg(int) flags;
} */
kauth_cred_t cred;
struct vnode *vp;
int error, flags;
struct nameidata nd;
cred = kauth_cred_dup(l->l_cred);
kauth_cred_seteuid(cred, kauth_cred_getuid(l->l_cred));
kauth_cred_setegid(cred, kauth_cred_getgid(l->l_cred));
NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | TRYEMULROOT, UIO_USERSPACE,
SCARG(uap, path));
/* 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);
if (!error && (flags & VWRITE))
error = vn_writechk(vp);
}
vput(vp);
out:
kauth_cred_free(cred);
return (error);
}
/*
* Common code for all sys_stat functions, including compat versions.
*/
int
do_sys_stat(const char *path, unsigned int nd_flags, struct stat *sb)
{
int error;
struct nameidata nd;
NDINIT(&nd, LOOKUP, nd_flags | LOCKLEAF | TRYEMULROOT,
UIO_USERSPACE, path);
error = namei(&nd);
if (error != 0)
return error;
error = vn_stat(nd.ni_vp, sb);
vput(nd.ni_vp);
return error;
}
/*
* Get file status; this version follows links.
*/
/* ARGSUSED */
int
sys___stat50(struct lwp *l, const struct sys___stat50_args *uap, register_t *retval)
{
/* {
syscallarg(const char *) path;
syscallarg(struct stat *) ub;
} */
struct stat sb;
int error;
error = do_sys_stat(SCARG(uap, path), FOLLOW, &sb);
if (error)
return error;
return copyout(&sb, SCARG(uap, ub), sizeof(sb));
}
/*
* Get file status; this version does not follow links.
*/
/* ARGSUSED */
int
sys___lstat50(struct lwp *l, const struct sys___lstat50_args *uap, register_t *retval)
{
/* {
syscallarg(const char *) path;
syscallarg(struct stat *) ub;
} */
struct stat sb;
int error;
error = do_sys_stat(SCARG(uap, path), NOFOLLOW, &sb);
if (error)
return error;
return copyout(&sb, SCARG(uap, ub), sizeof(sb));
}
/*
* Get configurable pathname variables.
*/
/* ARGSUSED */
int
sys_pathconf(struct lwp *l, const struct sys_pathconf_args *uap, register_t *retval)
{
/* {
syscallarg(const char *) path;
syscallarg(int) name;
} */
int error;
struct nameidata nd;
NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | TRYEMULROOT, UIO_USERSPACE,
SCARG(uap, path));
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(struct lwp *l, const struct sys_readlink_args *uap, register_t *retval)
{
/* {
syscallarg(const char *) path;
syscallarg(char *) buf;
syscallarg(size_t) count;
} */
struct vnode *vp;
struct iovec aiov;
struct uio auio;
int error;
struct nameidata nd;
NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF | TRYEMULROOT, UIO_USERSPACE,
SCARG(uap, path));
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, l->l_cred)) == 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;
KASSERT(l == curlwp);
auio.uio_vmspace = l->l_proc->p_vmspace;
auio.uio_resid = SCARG(uap, count);
error = VOP_READLINK(vp, &auio, l->l_cred);
}
vput(vp);
*retval = SCARG(uap, count) - auio.uio_resid;
return (error);
}
/*
* Change flags of a file given a path name.
*/
/* ARGSUSED */
int
sys_chflags(struct lwp *l, const struct sys_chflags_args *uap, register_t *retval)
{
/* {
syscallarg(const char *) path;
syscallarg(u_long) flags;
} */
struct vnode *vp;
int error;
error = namei_simple_user(SCARG(uap, path),
NSM_FOLLOW_TRYEMULROOT, &vp);
if (error != 0)
return (error);
error = change_flags(vp, SCARG(uap, flags), l);
vput(vp);
return (error);
}
/*
* Change flags of a file given a file descriptor.
*/
/* ARGSUSED */
int
sys_fchflags(struct lwp *l, const struct sys_fchflags_args *uap, register_t *retval)
{
/* {
syscallarg(int) fd;
syscallarg(u_long) flags;
} */
struct vnode *vp;
file_t *fp;
int error;
/* fd_getvnode() will use the descriptor for us */
if ((error = fd_getvnode(SCARG(uap, fd), &fp)) != 0)
return (error);
vp = fp->f_data;
error = change_flags(vp, SCARG(uap, flags), l);
VOP_UNLOCK(vp);
fd_putfile(SCARG(uap, fd));
return (error);
}
/*
* Change flags of a file given a path name; this version does
* not follow links.
*/
int
sys_lchflags(struct lwp *l, const struct sys_lchflags_args *uap, register_t *retval)
{
/* {
syscallarg(const char *) path;
syscallarg(u_long) flags;
} */
struct vnode *vp;
int error;
error = namei_simple_user(SCARG(uap, path),
NSM_NOFOLLOW_TRYEMULROOT, &vp);
if (error != 0)
return (error);
error = change_flags(vp, SCARG(uap, flags), l);
vput(vp);
return (error);
}
/*
* Common routine to change flags of a file.
*/
int
change_flags(struct vnode *vp, u_long flags, struct lwp *l)
{
struct vattr vattr;
int error;
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
/*
* Non-superusers cannot change the flags on devices, even if they
* own them.
*/
if (kauth_authorize_generic(l->l_cred, KAUTH_GENERIC_ISSUSER, NULL)) {
if ((error = VOP_GETATTR(vp, &vattr, l->l_cred)) != 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, l->l_cred);
out:
return (error);
}
/*
* Change mode of a file given path name; this version follows links.
*/
/* ARGSUSED */
int
sys_chmod(struct lwp *l, const struct sys_chmod_args *uap, register_t *retval)
{
/* {
syscallarg(const char *) path;
syscallarg(int) mode;
} */
int error;
struct vnode *vp;
error = namei_simple_user(SCARG(uap, path),
NSM_FOLLOW_TRYEMULROOT, &vp);
if (error != 0)
return (error);
error = change_mode(vp, SCARG(uap, mode), l);
vrele(vp);
return (error);
}
/*
* Change mode of a file given a file descriptor.
*/
/* ARGSUSED */
int
sys_fchmod(struct lwp *l, const struct sys_fchmod_args *uap, register_t *retval)
{
/* {
syscallarg(int) fd;
syscallarg(int) mode;
} */
file_t *fp;
int error;
/* fd_getvnode() will use the descriptor for us */
if ((error = fd_getvnode(SCARG(uap, fd), &fp)) != 0)
return (error);
error = change_mode(fp->f_data, SCARG(uap, mode), l);
fd_putfile(SCARG(uap, fd));
return (error);
}
/*
* Change mode of a file given path name; this version does not follow links.
*/
/* ARGSUSED */
int
sys_lchmod(struct lwp *l, const struct sys_lchmod_args *uap, register_t *retval)
{
/* {
syscallarg(const char *) path;
syscallarg(int) mode;
} */
int error;
struct vnode *vp;
error = namei_simple_user(SCARG(uap, path),
NSM_NOFOLLOW_TRYEMULROOT, &vp);
if (error != 0)
return (error);
error = change_mode(vp, SCARG(uap, mode), l);
vrele(vp);
return (error);
}
/*
* Common routine to set mode given a vnode.
*/
static int
change_mode(struct vnode *vp, int mode, struct lwp *l)
{
struct vattr vattr;
int error;
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
vattr_null(&vattr);
vattr.va_mode = mode & ALLPERMS;
error = VOP_SETATTR(vp, &vattr, l->l_cred);
VOP_UNLOCK(vp);
return (error);
}
/*
* Set ownership given a path name; this version follows links.
*/
/* ARGSUSED */
int
sys_chown(struct lwp *l, const struct sys_chown_args *uap, register_t *retval)
{
/* {
syscallarg(const char *) path;
syscallarg(uid_t) uid;
syscallarg(gid_t) gid;
} */
int error;
struct vnode *vp;
error = namei_simple_user(SCARG(uap, path),
NSM_FOLLOW_TRYEMULROOT, &vp);
if (error != 0)
return (error);
error = change_owner(vp, SCARG(uap, uid), SCARG(uap, gid), l, 0);
vrele(vp);
return (error);
}
/*
* Set ownership given a path name; this version follows links.
* Provides POSIX semantics.
*/
/* ARGSUSED */
int
sys___posix_chown(struct lwp *l, const struct sys___posix_chown_args *uap, register_t *retval)
{
/* {
syscallarg(const char *) path;
syscallarg(uid_t) uid;
syscallarg(gid_t) gid;
} */
int error;
struct vnode *vp;
error = namei_simple_user(SCARG(uap, path),
NSM_FOLLOW_TRYEMULROOT, &vp);
if (error != 0)
return (error);
error = change_owner(vp, SCARG(uap, uid), SCARG(uap, gid), l, 1);
vrele(vp);
return (error);
}
/*
* Set ownership given a file descriptor.
*/
/* ARGSUSED */
int
sys_fchown(struct lwp *l, const struct sys_fchown_args *uap, register_t *retval)
{
/* {
syscallarg(int) fd;
syscallarg(uid_t) uid;
syscallarg(gid_t) gid;
} */
int error;
file_t *fp;
/* fd_getvnode() will use the descriptor for us */
if ((error = fd_getvnode(SCARG(uap, fd), &fp)) != 0)
return (error);
error = change_owner(fp->f_data, SCARG(uap, uid), SCARG(uap, gid),
l, 0);
fd_putfile(SCARG(uap, fd));
return (error);
}
/*
* Set ownership given a file descriptor, providing POSIX/XPG semantics.
*/
/* ARGSUSED */
int
sys___posix_fchown(struct lwp *l, const struct sys___posix_fchown_args *uap, register_t *retval)
{
/* {
syscallarg(int) fd;
syscallarg(uid_t) uid;
syscallarg(gid_t) gid;
} */
int error;
file_t *fp;
/* fd_getvnode() will use the descriptor for us */
if ((error = fd_getvnode(SCARG(uap, fd), &fp)) != 0)
return (error);
error = change_owner(fp->f_data, SCARG(uap, uid), SCARG(uap, gid),
l, 1);
fd_putfile(SCARG(uap, fd));
return (error);
}
/*
* Set ownership given a path name; this version does not follow links.
*/
/* ARGSUSED */
int
sys_lchown(struct lwp *l, const struct sys_lchown_args *uap, register_t *retval)
{
/* {
syscallarg(const char *) path;
syscallarg(uid_t) uid;
syscallarg(gid_t) gid;
} */
int error;
struct vnode *vp;
error = namei_simple_user(SCARG(uap, path),
NSM_NOFOLLOW_TRYEMULROOT, &vp);
if (error != 0)
return (error);
error = change_owner(vp, SCARG(uap, uid), SCARG(uap, gid), l, 0);
vrele(vp);
return (error);
}
/*
* Set ownership given a path name; this version does not follow links.
* Provides POSIX/XPG semantics.
*/
/* ARGSUSED */
int
sys___posix_lchown(struct lwp *l, const struct sys___posix_lchown_args *uap, register_t *retval)
{
/* {
syscallarg(const char *) path;
syscallarg(uid_t) uid;
syscallarg(gid_t) gid;
} */
int error;
struct vnode *vp;
error = namei_simple_user(SCARG(uap, path),
NSM_NOFOLLOW_TRYEMULROOT, &vp);
if (error != 0)
return (error);
error = change_owner(vp, SCARG(uap, uid), SCARG(uap, gid), l, 1);
vrele(vp);
return (error);
}
/*
* Common routine to set ownership given a vnode.
*/
static int
change_owner(struct vnode *vp, uid_t uid, gid_t gid, struct lwp *l,
int posix_semantics)
{
struct vattr vattr;
mode_t newmode;
int error;
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
if ((error = VOP_GETATTR(vp, &vattr, l->l_cred)) != 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 (kauth_authorize_generic(l->l_cred, KAUTH_GENERIC_ISSUSER,
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, l->l_cred);
#undef CHANGED
out:
VOP_UNLOCK(vp);
return (error);
}
/*
* Set the access and modification times given a path name; this
* version follows links.
*/
/* ARGSUSED */
int
sys___utimes50(struct lwp *l, const struct sys___utimes50_args *uap,
register_t *retval)
{
/* {
syscallarg(const char *) path;
syscallarg(const struct timeval *) tptr;
} */
return do_sys_utimes(l, NULL, SCARG(uap, path), FOLLOW,
SCARG(uap, tptr), UIO_USERSPACE);
}
/*
* Set the access and modification times given a file descriptor.
*/
/* ARGSUSED */
int
sys___futimes50(struct lwp *l, const struct sys___futimes50_args *uap,
register_t *retval)
{
/* {
syscallarg(int) fd;
syscallarg(const struct timeval *) tptr;
} */
int error;
file_t *fp;
/* fd_getvnode() will use the descriptor for us */
if ((error = fd_getvnode(SCARG(uap, fd), &fp)) != 0)
return (error);
error = do_sys_utimes(l, fp->f_data, NULL, 0, SCARG(uap, tptr),
UIO_USERSPACE);
fd_putfile(SCARG(uap, fd));
return (error);
}
/*
* Set the access and modification times given a path name; this
* version does not follow links.
*/
int
sys___lutimes50(struct lwp *l, const struct sys___lutimes50_args *uap,
register_t *retval)
{
/* {
syscallarg(const char *) path;
syscallarg(const struct timeval *) tptr;
} */
return do_sys_utimes(l, NULL, SCARG(uap, path), NOFOLLOW,
SCARG(uap, tptr), UIO_USERSPACE);
}
/*
* Common routine to set access and modification times given a vnode.
*/
int
do_sys_utimes(struct lwp *l, struct vnode *vp, const char *path, int flag,
const struct timeval *tptr, enum uio_seg seg)
{
struct vattr vattr;
int error, dorele = 0;
namei_simple_flags_t sflags;
bool vanull, setbirthtime;
struct timespec ts[2];
/*
* I have checked all callers and they pass either FOLLOW,
* NOFOLLOW, or 0 (when they don't pass a path), and NOFOLLOW
* is 0. More to the point, they don't pass anything else.
* Let's keep it that way at least until the namei interfaces
* are fully sanitized.
*/
KASSERT(flag == NOFOLLOW || flag == FOLLOW);
sflags = (flag == FOLLOW) ?
NSM_FOLLOW_TRYEMULROOT : NSM_NOFOLLOW_TRYEMULROOT;
if (tptr == NULL) {
vanull = true;
nanotime(&ts[0]);
ts[1] = ts[0];
} else {
struct timeval tv[2];
vanull = false;
if (seg != UIO_SYSSPACE) {
error = copyin(tptr, tv, sizeof (tv));
if (error != 0)
return error;
tptr = tv;
}
TIMEVAL_TO_TIMESPEC(&tptr[0], &ts[0]);
TIMEVAL_TO_TIMESPEC(&tptr[1], &ts[1]);
}
if (vp == NULL) {
/* note: SEG describes TPTR, not PATH; PATH is always user */
error = namei_simple_user(path, sflags, &vp);
if (error != 0)
return error;
dorele = 1;
}
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
setbirthtime = (VOP_GETATTR(vp, &vattr, l->l_cred) == 0 &&
timespeccmp(&ts[1], &vattr.va_birthtime, <));
vattr_null(&vattr);
vattr.va_atime = ts[0];
vattr.va_mtime = ts[1];
if (setbirthtime)
vattr.va_birthtime = ts[1];
if (vanull)
vattr.va_vaflags |= VA_UTIMES_NULL;
error = VOP_SETATTR(vp, &vattr, l->l_cred);
VOP_UNLOCK(vp);
if (dorele != 0)
vrele(vp);
return error;
}
/*
* Truncate a file given its path name.
*/
/* ARGSUSED */
int
sys_truncate(struct lwp *l, const struct sys_truncate_args *uap, register_t *retval)
{
/* {
syscallarg(const char *) path;
syscallarg(int) pad;
syscallarg(off_t) length;
} */
struct vnode *vp;
struct vattr vattr;
int error;
error = namei_simple_user(SCARG(uap, path),
NSM_FOLLOW_TRYEMULROOT, &vp);
if (error != 0)
return (error);
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, l->l_cred)) == 0) {
vattr_null(&vattr);
vattr.va_size = SCARG(uap, length);
error = VOP_SETATTR(vp, &vattr, l->l_cred);
}
vput(vp);
return (error);
}
/*
* Truncate a file given a file descriptor.
*/
/* ARGSUSED */
int
sys_ftruncate(struct lwp *l, const struct sys_ftruncate_args *uap, register_t *retval)
{
/* {
syscallarg(int) fd;
syscallarg(int) pad;
syscallarg(off_t) length;
} */
struct vattr vattr;
struct vnode *vp;
file_t *fp;
int error;
/* fd_getvnode() will use the descriptor for us */
if ((error = fd_getvnode(SCARG(uap, fd), &fp)) != 0)
return (error);
if ((fp->f_flag & FWRITE) == 0) {
error = EINVAL;
goto out;
}
vp = fp->f_data;
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);
}
VOP_UNLOCK(vp);
out:
fd_putfile(SCARG(uap, fd));
return (error);
}
/*
* Sync an open file.
*/
/* ARGSUSED */
int
sys_fsync(struct lwp *l, const struct sys_fsync_args *uap, register_t *retval)
{
/* {
syscallarg(int) fd;
} */
struct vnode *vp;
file_t *fp;
int error;
/* fd_getvnode() will use the descriptor for us */
if ((error = fd_getvnode(SCARG(uap, fd), &fp)) != 0)
return (error);
vp = fp->f_data;
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
error = VOP_FSYNC(vp, fp->f_cred, FSYNC_WAIT, 0, 0);
VOP_UNLOCK(vp);
fd_putfile(SCARG(uap, fd));
return (error);
}
/*
* Sync a range of file data. API modeled after that found in AIX.
*
* FDATASYNC indicates that we need only save enough metadata to be able
* to re-read the written data. Note we duplicate AIX's requirement that
* the file be open for writing.
*/
/* ARGSUSED */
int
sys_fsync_range(struct lwp *l, const struct sys_fsync_range_args *uap, register_t *retval)
{
/* {
syscallarg(int) fd;
syscallarg(int) flags;
syscallarg(off_t) start;
syscallarg(off_t) length;
} */
struct vnode *vp;
file_t *fp;
int flags, nflags;
off_t s, e, len;
int error;
/* fd_getvnode() will use the descriptor for us */
if ((error = fd_getvnode(SCARG(uap, fd), &fp)) != 0)
return (error);
if ((fp->f_flag & FWRITE) == 0) {
error = EBADF;
goto out;
}
flags = SCARG(uap, flags);
if (((flags & (FDATASYNC | FFILESYNC)) == 0) ||
((~flags & (FDATASYNC | FFILESYNC)) == 0)) {
error = EINVAL;
goto out;
}
/* Now set up the flags for value(s) to pass to VOP_FSYNC() */
if (flags & FDATASYNC)
nflags = FSYNC_DATAONLY | FSYNC_WAIT;
else
nflags = FSYNC_WAIT;
if (flags & FDISKSYNC)
nflags |= FSYNC_CACHE;
len = SCARG(uap, length);
/* If length == 0, we do the whole file, and s = l = 0 will do that */
if (len) {
s = SCARG(uap, start);
e = s + len;
if (e < s) {
error = EINVAL;
goto out;
}
} else {
e = 0;
s = 0;
}
vp = fp->f_data;
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
error = VOP_FSYNC(vp, fp->f_cred, nflags, s, e);
VOP_UNLOCK(vp);
out:
fd_putfile(SCARG(uap, fd));
return (error);
}
/*
* Sync the data of an open file.
*/
/* ARGSUSED */
int
sys_fdatasync(struct lwp *l, const struct sys_fdatasync_args *uap, register_t *retval)
{
/* {
syscallarg(int) fd;
} */
struct vnode *vp;
file_t *fp;
int error;
/* fd_getvnode() will use the descriptor for us */
if ((error = fd_getvnode(SCARG(uap, fd), &fp)) != 0)
return (error);
if ((fp->f_flag & FWRITE) == 0) {
fd_putfile(SCARG(uap, fd));
return (EBADF);
}
vp = fp->f_data;
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
error = VOP_FSYNC(vp, fp->f_cred, FSYNC_WAIT|FSYNC_DATAONLY, 0, 0);
VOP_UNLOCK(vp);
fd_putfile(SCARG(uap, fd));
return (error);
}
/*
* Rename files, (standard) BSD semantics frontend.
*/
/* ARGSUSED */
int
sys_rename(struct lwp *l, const struct sys_rename_args *uap, register_t *retval)
{
/* {
syscallarg(const char *) from;
syscallarg(const char *) to;
} */
return (do_sys_rename(SCARG(uap, from), SCARG(uap, to), UIO_USERSPACE, 0));
}
/*
* Rename files, POSIX semantics frontend.
*/
/* ARGSUSED */
int
sys___posix_rename(struct lwp *l, const struct sys___posix_rename_args *uap, register_t *retval)
{
/* {
syscallarg(const char *) from;
syscallarg(const char *) to;
} */
return (do_sys_rename(SCARG(uap, from), SCARG(uap, to), UIO_USERSPACE, 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).
*/
int
do_sys_rename(const char *from, const char *to, enum uio_seg seg, int retain)
{
struct vnode *tvp, *fvp, *tdvp;
struct nameidata fromnd, tond;
struct mount *fs;
struct lwp *l = curlwp;
struct proc *p;
uint32_t saveflag;
int error;
NDINIT(&fromnd, DELETE, LOCKPARENT | SAVESTART | TRYEMULROOT | INRENAME,
seg, from);
if ((error = namei(&fromnd)) != 0)
return (error);
if (fromnd.ni_dvp != fromnd.ni_vp)
VOP_UNLOCK(fromnd.ni_dvp);
fvp = fromnd.ni_vp;
fs = fvp->v_mount;
error = VFS_RENAMELOCK_ENTER(fs);
if (error) {
VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd);
vrele(fromnd.ni_dvp);
vrele(fvp);
goto out1;
}
/*
* close, partially, yet another race - ideally we should only
* go as far as getting fromnd.ni_dvp before getting the per-fs
* lock, and then continue to get fromnd.ni_vp, but we can't do
* that with namei as it stands.
*
* This still won't prevent rmdir from nuking fromnd.ni_vp
* under us. The real fix is to get the locks in the right
* order and do the lookups in the right places, but that's a
* major rototill.
*
* Preserve the SAVESTART in cn_flags, because who knows what
* might happen if we don't.
*
* Note: this logic (as well as this whole function) is cloned
* in nfs_serv.c. Proceed accordingly.
*/
vrele(fvp);
if ((fromnd.ni_cnd.cn_namelen == 1 &&
fromnd.ni_cnd.cn_nameptr[0] == '.') ||
(fromnd.ni_cnd.cn_namelen == 2 &&
fromnd.ni_cnd.cn_nameptr[0] == '.' &&
fromnd.ni_cnd.cn_nameptr[1] == '.')) {
error = EINVAL;
VFS_RENAMELOCK_EXIT(fs);
VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd);
vrele(fromnd.ni_dvp);
goto out1;
}
saveflag = fromnd.ni_cnd.cn_flags & SAVESTART;
fromnd.ni_cnd.cn_flags &= ~SAVESTART;
vn_lock(fromnd.ni_dvp, LK_EXCLUSIVE | LK_RETRY);
error = relookup(fromnd.ni_dvp, &fromnd.ni_vp, &fromnd.ni_cnd);
fromnd.ni_cnd.cn_flags |= saveflag;
if (error) {
VOP_UNLOCK(fromnd.ni_dvp);
VFS_RENAMELOCK_EXIT(fs);
VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd);
vrele(fromnd.ni_dvp);
goto out1;
}
VOP_UNLOCK(fromnd.ni_vp);
if (fromnd.ni_dvp != fromnd.ni_vp)
VOP_UNLOCK(fromnd.ni_dvp);
fvp = fromnd.ni_vp;
NDINIT(&tond, RENAME,
LOCKPARENT | LOCKLEAF | NOCACHE | SAVESTART | TRYEMULROOT
| INRENAME | (fvp->v_type == VDIR ? CREATEDIR : 0),
seg, to);
if ((error = namei(&tond)) != 0) {
VFS_RENAMELOCK_EXIT(fs);
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;
}
#if NVERIEXEC > 0
if (!error) {
char *f1, *f2;
size_t f1_len;
size_t f2_len;
f1_len = fromnd.ni_cnd.cn_namelen + 1;
f1 = kmem_alloc(f1_len, KM_SLEEP);
strlcpy(f1, fromnd.ni_cnd.cn_nameptr, f1_len);
f2_len = tond.ni_cnd.cn_namelen + 1;
f2 = kmem_alloc(f2_len, KM_SLEEP);
strlcpy(f2, tond.ni_cnd.cn_nameptr, f2_len);
error = veriexec_renamechk(l, fvp, f1, tvp, f2);
kmem_free(f1, f1_len);
kmem_free(f2, f2_len);
}
#endif /* NVERIEXEC > 0 */
out:
p = l->l_proc;
if (!error) {
error = VOP_RENAME(fromnd.ni_dvp, fromnd.ni_vp, &fromnd.ni_cnd,
tond.ni_dvp, tond.ni_vp, &tond.ni_cnd);
VFS_RENAMELOCK_EXIT(fs);
} else {
VOP_ABORTOP(tond.ni_dvp, &tond.ni_cnd);
if (tdvp == tvp)
vrele(tdvp);
else
vput(tdvp);
if (tvp)
vput(tvp);
VFS_RENAMELOCK_EXIT(fs);
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:
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(struct lwp *l, const struct sys_mkdir_args *uap, register_t *retval)
{
/* {
syscallarg(const char *) path;
syscallarg(int) mode;
} */
return do_sys_mkdir(SCARG(uap, path), SCARG(uap, mode), UIO_USERSPACE);
}
int
do_sys_mkdir(const char *path, mode_t mode, enum uio_seg seg)
{
struct proc *p = curlwp->l_proc;
struct vnode *vp;
struct vattr vattr;
int error;
struct nameidata nd;
NDINIT(&nd, CREATE, LOCKPARENT | CREATEDIR | TRYEMULROOT,
seg, path);
if ((error = namei(&nd)) != 0)
return (error);
vp = nd.ni_vp;
if (vp != NULL) {
VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd);
if (nd.ni_dvp == vp)
vrele(nd.ni_dvp);
else
vput(nd.ni_dvp);
vrele(vp);
return (EEXIST);
}
vattr_null(&vattr);
vattr.va_type = VDIR;
/* We will read cwdi->cwdi_cmask unlocked. */
vattr.va_mode = (mode & ACCESSPERMS) &~ p->p_cwdi->cwdi_cmask;
error = VOP_MKDIR(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr);
if (!error)
vput(nd.ni_vp);
return (error);
}
/*
* Remove a directory file.
*/
/* ARGSUSED */
int
sys_rmdir(struct lwp *l, const struct sys_rmdir_args *uap, register_t *retval)
{
/* {
syscallarg(const char *) path;
} */
struct vnode *vp;
int error;
struct nameidata nd;
NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF | TRYEMULROOT, UIO_USERSPACE,
SCARG(uap, path));
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_vflag & VV_ROOT) != 0 || vp->v_mountedhere != NULL) {
error = EBUSY;
goto out;
}
error = VOP_RMDIR(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd);
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___getdents30(struct lwp *l, const struct sys___getdents30_args *uap, register_t *retval)
{
/* {
syscallarg(int) fd;
syscallarg(char *) buf;
syscallarg(size_t) count;
} */
file_t *fp;
int error, done;
/* fd_getvnode() will use the descriptor for us */
if ((error = fd_getvnode(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, l, 0, 0);
ktrgenio(SCARG(uap, fd), UIO_READ, SCARG(uap, buf), done, error);
*retval = done;
out:
fd_putfile(SCARG(uap, fd));
return (error);
}
/*
* Set the mode mask for creation of filesystem nodes.
*/
int
sys_umask(struct lwp *l, const struct sys_umask_args *uap, register_t *retval)
{
/* {
syscallarg(mode_t) newmask;
} */
struct proc *p = l->l_proc;
struct cwdinfo *cwdi;
/*
* cwdi->cwdi_cmask will be read unlocked elsewhere. What's
* important is that we serialize changes to the mask. The
* rw_exit() will issue a write memory barrier on our behalf,
* and force the changes out to other CPUs (as it must use an
* atomic operation, draining the local CPU's store buffers).
*/
cwdi = p->p_cwdi;
rw_enter(&cwdi->cwdi_lock, RW_WRITER);
*retval = cwdi->cwdi_cmask;
cwdi->cwdi_cmask = SCARG(uap, newmask) & ALLPERMS;
rw_exit(&cwdi->cwdi_lock);
return (0);
}
int
dorevoke(struct vnode *vp, kauth_cred_t cred)
{
struct vattr vattr;
int error;
if ((error = VOP_GETATTR(vp, &vattr, cred)) != 0)
return error;
if (kauth_cred_geteuid(cred) == vattr.va_uid ||
(error = kauth_authorize_generic(cred,
KAUTH_GENERIC_ISSUSER, NULL)) == 0)
VOP_REVOKE(vp, REVOKEALL);
return (error);
}
/*
* Void all references to file by ripping underlying filesystem
* away from vnode.
*/
/* ARGSUSED */
int
sys_revoke(struct lwp *l, const struct sys_revoke_args *uap, register_t *retval)
{
/* {
syscallarg(const char *) path;
} */
struct vnode *vp;
int error;
error = namei_simple_user(SCARG(uap, path),
NSM_FOLLOW_TRYEMULROOT, &vp);
if (error != 0)
return (error);
error = dorevoke(vp, l->l_cred);
vrele(vp);
return (error);
}
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