File:
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kern /
vfs_syscalls.c
Revision
1.30:
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Tue Mar 16 17:53:53 2004 UTC (9 years, 2 months ago) by
dillon
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MAIN
CVS tags:
HEAD
Separate chroot() into kern_chroot(). Rename change_dir() to checkvp_chdir()
and reorganize the code to avoid doing weird things to the passed vnode's
lock and ref count in deep subroutines (which lead to buggy code).
Fix a bug in chdir()/kern_chdir() (the namei data was not being freed in all
cases), and also fix a bug in symlink() (missing zfree in error case).
Submitted-by: Paul Herman <pherman@frenchfries.net>
Additional-work-by: dillon
/*
* Copyright (c) 1989, 1993
* The Regents of the University of California. All rights reserved.
* (c) UNIX System Laboratories, Inc.
* All or some portions of this file are derived from material licensed
* to the University of California by American Telephone and Telegraph
* Co. or Unix System Laboratories, Inc. and are reproduced herein with
* the permission of UNIX System Laboratories, Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)vfs_syscalls.c 8.13 (Berkeley) 4/15/94
* $FreeBSD: src/sys/kern/vfs_syscalls.c,v 1.151.2.18 2003/04/04 20:35:58 tegge Exp $
* $DragonFly: src/sys/kern/vfs_syscalls.c,v 1.30 2004/03/16 17:53:53 dillon Exp $
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/buf.h>
#include <sys/sysent.h>
#include <sys/malloc.h>
#include <sys/mount.h>
#include <sys/sysproto.h>
#include <sys/filedesc.h>
#include <sys/kernel.h>
#include <sys/fcntl.h>
#include <sys/file.h>
#include <sys/linker.h>
#include <sys/stat.h>
#include <sys/unistd.h>
#include <sys/vnode.h>
#include <sys/proc.h>
#include <sys/namei.h>
#include <sys/dirent.h>
#include <sys/extattr.h>
#include <sys/kern_syscall.h>
#include <machine/limits.h>
#include <vfs/union/union.h>
#include <sys/sysctl.h>
#include <vm/vm.h>
#include <vm/vm_object.h>
#include <vm/vm_zone.h>
#include <vm/vm_page.h>
#include <sys/file2.h>
static int checkvp_chdir (struct vnode *vn, struct thread *td);
static void checkdirs (struct vnode *olddp);
static int chroot_refuse_vdir_fds (struct filedesc *fdp);
static int getutimes (const struct timeval *, struct timespec *);
static int setfown (struct vnode *, uid_t, gid_t);
static int setfmode (struct vnode *, int);
static int setfflags (struct vnode *, int);
static int setutimes (struct vnode *, const struct timespec *, int);
static int usermount = 0; /* if 1, non-root can mount fs. */
int (*union_dircheckp) (struct thread *, struct vnode **, struct file *);
SYSCTL_INT(_vfs, OID_AUTO, usermount, CTLFLAG_RW, &usermount, 0, "");
/*
* Virtual File System System Calls
*/
/*
* Mount a file system.
*/
/*
* mount_args(char *type, char *path, int flags, caddr_t data)
*/
/* ARGSUSED */
int
mount(struct mount_args *uap)
{
struct thread *td = curthread;
struct proc *p = td->td_proc;
struct vnode *vp;
struct mount *mp;
struct vfsconf *vfsp;
int error, flag = 0, flag2 = 0;
struct vattr va;
struct nameidata nd;
char fstypename[MFSNAMELEN];
lwkt_tokref vlock;
lwkt_tokref ilock;
if (usermount == 0 && (error = suser(td)))
return (error);
/*
* Do not allow NFS export by non-root users.
*/
if (SCARG(uap, flags) & MNT_EXPORTED) {
error = suser(td);
if (error)
return (error);
}
/*
* Silently enforce MNT_NOSUID and MNT_NODEV for non-root users
*/
if (suser(td))
SCARG(uap, flags) |= MNT_NOSUID | MNT_NODEV;
/*
* Get vnode to be covered
*/
NDINIT(&nd, NAMEI_LOOKUP, CNP_FOLLOW | CNP_LOCKLEAF, UIO_USERSPACE,
SCARG(uap, path), td);
if ((error = namei(&nd)) != 0)
return (error);
NDFREE(&nd, NDF_ONLY_PNBUF);
vp = nd.ni_vp;
if (SCARG(uap, flags) & MNT_UPDATE) {
if ((vp->v_flag & VROOT) == 0) {
vput(vp);
return (EINVAL);
}
mp = vp->v_mount;
flag = mp->mnt_flag;
flag2 = mp->mnt_kern_flag;
/*
* 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 */
}
/*
* Only root, or the user that did the original mount is
* permitted to update it.
*/
if (mp->mnt_stat.f_owner != p->p_ucred->cr_uid &&
(error = suser(td))) {
vput(vp);
return (error);
}
if (vfs_busy(mp, LK_NOWAIT, NULL, td)) {
vput(vp);
return (EBUSY);
}
lwkt_gettoken(&vlock, vp->v_interlock);
if ((vp->v_flag & VMOUNT) != 0 ||
vp->v_mountedhere != NULL) {
lwkt_reltoken(&vlock);
vfs_unbusy(mp, td);
vput(vp);
return (EBUSY);
}
vp->v_flag |= VMOUNT;
lwkt_reltoken(&vlock);
mp->mnt_flag |=
SCARG(uap, flags) & (MNT_RELOAD | MNT_FORCE | MNT_UPDATE);
VOP_UNLOCK(vp, NULL, 0, td);
goto update;
}
/*
* If the user is not root, ensure that they own the directory
* onto which we are attempting to mount.
*/
if ((error = VOP_GETATTR(vp, &va, td)) ||
(va.va_uid != p->p_ucred->cr_uid &&
(error = suser(td)))) {
vput(vp);
return (error);
}
if ((error = vinvalbuf(vp, V_SAVE, td, 0, 0)) != 0) {
vput(vp);
return (error);
}
if (vp->v_type != VDIR) {
vput(vp);
return (ENOTDIR);
}
if ((error = copyinstr(SCARG(uap, type), fstypename, MFSNAMELEN, NULL)) != 0) {
vput(vp);
return (error);
}
for (vfsp = vfsconf; vfsp; vfsp = vfsp->vfc_next)
if (!strcmp(vfsp->vfc_name, fstypename))
break;
if (vfsp == NULL) {
linker_file_t lf;
/* Only load modules for root (very important!) */
if ((error = suser(td)) != 0) {
vput(vp);
return error;
}
error = linker_load_file(fstypename, &lf);
if (error || lf == NULL) {
vput(vp);
if (lf == NULL)
error = ENODEV;
return error;
}
lf->userrefs++;
/* lookup again, see if the VFS was loaded */
for (vfsp = vfsconf; vfsp; vfsp = vfsp->vfc_next)
if (!strcmp(vfsp->vfc_name, fstypename))
break;
if (vfsp == NULL) {
lf->userrefs--;
linker_file_unload(lf);
vput(vp);
return (ENODEV);
}
}
lwkt_gettoken(&vlock, vp->v_interlock);
if ((vp->v_flag & VMOUNT) != 0 ||
vp->v_mountedhere != NULL) {
lwkt_reltoken(&vlock);
vput(vp);
return (EBUSY);
}
vp->v_flag |= VMOUNT;
lwkt_reltoken(&vlock);
/*
* Allocate and initialize the filesystem.
*/
mp = malloc(sizeof(struct mount), M_MOUNT, M_WAITOK);
bzero((char *)mp, (u_long)sizeof(struct mount));
TAILQ_INIT(&mp->mnt_nvnodelist);
TAILQ_INIT(&mp->mnt_reservedvnlist);
mp->mnt_nvnodelistsize = 0;
lockinit(&mp->mnt_lock, 0, "vfslock", 0, LK_NOPAUSE);
vfs_busy(mp, LK_NOWAIT, NULL, td);
mp->mnt_op = vfsp->vfc_vfsops;
mp->mnt_vfc = vfsp;
vfsp->vfc_refcount++;
mp->mnt_stat.f_type = vfsp->vfc_typenum;
mp->mnt_flag |= vfsp->vfc_flags & MNT_VISFLAGMASK;
strncpy(mp->mnt_stat.f_fstypename, vfsp->vfc_name, MFSNAMELEN);
mp->mnt_vnodecovered = vp;
mp->mnt_stat.f_owner = p->p_ucred->cr_uid;
mp->mnt_iosize_max = DFLTPHYS;
VOP_UNLOCK(vp, NULL, 0, td);
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_kern_flag |= MNTK_WANTRDWR;
mp->mnt_flag &=~ (MNT_NOSUID | MNT_NOEXEC | MNT_NODEV |
MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | MNT_NOATIME |
MNT_NOSYMFOLLOW | MNT_IGNORE |
MNT_NOCLUSTERR | MNT_NOCLUSTERW | MNT_SUIDDIR);
mp->mnt_flag |= SCARG(uap, flags) & (MNT_NOSUID | MNT_NOEXEC |
MNT_NODEV | MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | MNT_FORCE |
MNT_NOSYMFOLLOW | MNT_IGNORE |
MNT_NOATIME | MNT_NOCLUSTERR | MNT_NOCLUSTERW | MNT_SUIDDIR);
/*
* Mount the filesystem.
* XXX The final recipients of VFS_MOUNT just overwrite the ndp they
* get. No freeing of cn_pnbuf.
*/
error = VFS_MOUNT(mp, SCARG(uap, path), SCARG(uap, data), &nd, td);
if (mp->mnt_flag & MNT_UPDATE) {
if (mp->mnt_kern_flag & MNTK_WANTRDWR)
mp->mnt_flag &= ~MNT_RDONLY;
mp->mnt_flag &=~ (MNT_UPDATE | MNT_RELOAD | MNT_FORCE);
mp->mnt_kern_flag &=~ MNTK_WANTRDWR;
if (error) {
mp->mnt_flag = flag;
mp->mnt_kern_flag = flag2;
}
vfs_unbusy(mp, td);
lwkt_gettoken(&vlock, vp->v_interlock);
vp->v_flag &= ~VMOUNT;
lwkt_reltoken(&vlock);
vrele(vp);
return (error);
}
vn_lock(vp, NULL, LK_EXCLUSIVE | LK_RETRY, td);
/*
* Put the new filesystem on the mount list after root.
*/
cache_purge(vp);
if (!error) {
lwkt_gettoken(&vlock, vp->v_interlock);
vp->v_flag &= ~VMOUNT;
vp->v_mountedhere = mp;
lwkt_reltoken(&vlock);
lwkt_gettoken(&ilock, &mountlist_token);
TAILQ_INSERT_TAIL(&mountlist, mp, mnt_list);
lwkt_reltoken(&ilock);
checkdirs(vp);
VOP_UNLOCK(vp, NULL, 0, td);
error = vfs_allocate_syncvnode(mp);
vfs_unbusy(mp, td);
if ((error = VFS_START(mp, 0, td)) != 0)
vrele(vp);
} else {
lwkt_gettoken(&vlock, vp->v_interlock);
vp->v_flag &= ~VMOUNT;
lwkt_reltoken(&vlock);
mp->mnt_vfc->vfc_refcount--;
vfs_unbusy(mp, td);
free((caddr_t)mp, M_MOUNT);
vput(vp);
}
return (error);
}
/*
* Scan all active processes to see if any of them have a current
* or root directory onto which the new filesystem has just been
* mounted. If so, replace them with the new mount point.
*/
static void
checkdirs(struct vnode *olddp)
{
struct filedesc *fdp;
struct vnode *newdp;
struct proc *p;
if (olddp->v_usecount == 1)
return;
if (VFS_ROOT(olddp->v_mountedhere, &newdp))
panic("mount: lost mount");
FOREACH_PROC_IN_SYSTEM(p) {
fdp = p->p_fd;
if (fdp->fd_cdir == olddp) {
vrele(fdp->fd_cdir);
VREF(newdp);
fdp->fd_cdir = newdp;
}
if (fdp->fd_rdir == olddp) {
vrele(fdp->fd_rdir);
VREF(newdp);
fdp->fd_rdir = newdp;
}
}
if (rootvnode == olddp) {
vrele(rootvnode);
VREF(newdp);
rootvnode = newdp;
vfs_cache_setroot(rootvnode);
}
vput(newdp);
}
/*
* Unmount a file system.
*
* Note: unmount takes a path to the vnode mounted on as argument,
* not special file (as before).
*/
/*
* umount_args(char *path, int flags)
*/
/* ARGSUSED */
int
unmount(struct unmount_args *uap)
{
struct thread *td = curthread;
struct proc *p = td->td_proc;
struct vnode *vp;
struct mount *mp;
int error;
struct nameidata nd;
KKASSERT(p);
NDINIT(&nd, NAMEI_LOOKUP, CNP_FOLLOW | CNP_LOCKLEAF, UIO_USERSPACE,
SCARG(uap, path), td);
if ((error = namei(&nd)) != 0)
return (error);
vp = nd.ni_vp;
NDFREE(&nd, NDF_ONLY_PNBUF);
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(td))) {
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);
return (dounmount(mp, SCARG(uap, flags), td));
}
/*
* Do the actual file system unmount.
*/
int
dounmount(struct mount *mp, int flags, struct thread *td)
{
struct vnode *coveredvp;
int error;
int async_flag;
lwkt_tokref ilock;
lwkt_gettoken(&ilock, &mountlist_token);
if (mp->mnt_kern_flag & MNTK_UNMOUNT) {
lwkt_reltoken(&ilock);
return (EBUSY);
}
mp->mnt_kern_flag |= MNTK_UNMOUNT;
/* Allow filesystems to detect that a forced unmount is in progress. */
if (flags & MNT_FORCE)
mp->mnt_kern_flag |= MNTK_UNMOUNTF;
error = lockmgr(&mp->mnt_lock, LK_DRAIN | LK_INTERLOCK |
((flags & MNT_FORCE) ? 0 : LK_NOWAIT), &ilock, td);
if (error) {
mp->mnt_kern_flag &= ~(MNTK_UNMOUNT | MNTK_UNMOUNTF);
if (mp->mnt_kern_flag & MNTK_MWAIT)
wakeup((caddr_t)mp);
return (error);
}
if (mp->mnt_flag & MNT_EXPUBLIC)
vfs_setpublicfs(NULL, NULL, NULL);
vfs_msync(mp, MNT_WAIT);
async_flag = 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)
vrele(mp->mnt_syncer);
if (((mp->mnt_flag & MNT_RDONLY) ||
(error = VFS_SYNC(mp, MNT_WAIT, td)) == 0) ||
(flags & MNT_FORCE))
error = VFS_UNMOUNT(mp, flags, td);
lwkt_gettokref(&ilock);
if (error) {
if (mp->mnt_syncer == NULL)
vfs_allocate_syncvnode(mp);
mp->mnt_kern_flag &= ~(MNTK_UNMOUNT | MNTK_UNMOUNTF);
mp->mnt_flag |= async_flag;
lockmgr(&mp->mnt_lock, LK_RELEASE | LK_INTERLOCK | LK_REENABLE,
&ilock, td);
if (mp->mnt_kern_flag & MNTK_MWAIT)
wakeup((caddr_t)mp);
return (error);
}
TAILQ_REMOVE(&mountlist, mp, mnt_list);
if ((coveredvp = mp->mnt_vnodecovered) != NULLVP) {
coveredvp->v_mountedhere = NULL;
vrele(coveredvp);
}
mp->mnt_vfc->vfc_refcount--;
if (!TAILQ_EMPTY(&mp->mnt_nvnodelist))
panic("unmount: dangling vnode");
lockmgr(&mp->mnt_lock, LK_RELEASE | LK_INTERLOCK, &ilock, td);
if (mp->mnt_kern_flag & MNTK_MWAIT)
wakeup((caddr_t)mp);
free((caddr_t)mp, M_MOUNT);
return (0);
}
/*
* Sync each mounted filesystem.
*/
#ifdef DEBUG
static int syncprt = 0;
SYSCTL_INT(_debug, OID_AUTO, syncprt, CTLFLAG_RW, &syncprt, 0, "");
#endif
/* ARGSUSED */
int
sync(struct sync_args *uap)
{
struct thread *td = curthread;
struct mount *mp, *nmp;
lwkt_tokref ilock;
int asyncflag;
lwkt_gettoken(&ilock, &mountlist_token);
for (mp = TAILQ_FIRST(&mountlist); mp != NULL; mp = nmp) {
if (vfs_busy(mp, LK_NOWAIT, &ilock, td)) {
nmp = TAILQ_NEXT(mp, mnt_list);
continue;
}
if ((mp->mnt_flag & MNT_RDONLY) == 0) {
asyncflag = mp->mnt_flag & MNT_ASYNC;
mp->mnt_flag &= ~MNT_ASYNC;
vfs_msync(mp, MNT_NOWAIT);
VFS_SYNC(mp, MNT_NOWAIT, td);
mp->mnt_flag |= asyncflag;
}
lwkt_gettokref(&ilock);
nmp = TAILQ_NEXT(mp, mnt_list);
vfs_unbusy(mp, td);
}
lwkt_reltoken(&ilock);
#if 0
/*
* XXX don't call vfs_bufstats() yet because that routine
* was not imported in the Lite2 merge.
*/
#ifdef DIAGNOSTIC
if (syncprt)
vfs_bufstats();
#endif /* DIAGNOSTIC */
#endif
return (0);
}
/* XXX PRISON: could be per prison flag */
static int prison_quotas;
#if 0
SYSCTL_INT(_kern_prison, OID_AUTO, quotas, CTLFLAG_RW, &prison_quotas, 0, "");
#endif
/*
* quotactl_args(char *path, int fcmd, int uid, caddr_t arg)
*
* Change filesystem quotas.
*/
/* ARGSUSED */
int
quotactl(struct quotactl_args *uap)
{
struct thread *td = curthread;
struct proc *p = td->td_proc;
struct mount *mp;
int error;
struct nameidata nd;
KKASSERT(p);
if (p->p_ucred->cr_prison && !prison_quotas)
return (EPERM);
NDINIT(&nd, NAMEI_LOOKUP, CNP_FOLLOW, UIO_USERSPACE,
SCARG(uap, path), td);
if ((error = namei(&nd)) != 0)
return (error);
mp = nd.ni_vp->v_mount;
NDFREE(&nd, NDF_ONLY_PNBUF);
vrele(nd.ni_vp);
return (VFS_QUOTACTL(mp, SCARG(uap, cmd), SCARG(uap, uid),
SCARG(uap, arg), td));
}
int
kern_statfs(struct nameidata *nd, struct statfs *buf)
{
struct thread *td = curthread;
struct mount *mp;
struct statfs *sp;
int error;
error = namei(nd);
if (error)
return (error);
mp = nd->ni_vp->v_mount;
sp = &mp->mnt_stat;
NDFREE(nd, NDF_ONLY_PNBUF);
vrele(nd->ni_vp);
error = VFS_STATFS(mp, sp, td);
if (error)
return (error);
sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK;
bcopy(sp, buf, sizeof(*buf));
/* Only root should have access to the fsid's. */
if (suser(td))
buf->f_fsid.val[0] = buf->f_fsid.val[1] = 0;
return (0);
}
/*
* statfs_args(char *path, struct statfs *buf)
*
* Get filesystem statistics.
*/
int
statfs(struct statfs_args *uap)
{
struct thread *td = curthread;
struct nameidata nd;
struct statfs buf;
int error;
NDINIT(&nd, NAMEI_LOOKUP, CNP_FOLLOW, UIO_USERSPACE, uap->path, td);
error = kern_statfs(&nd, &buf);
if (error == 0)
error = copyout(&buf, uap->buf, sizeof(*uap->buf));
return (error);
}
int
kern_fstatfs(int fd, struct statfs *buf)
{
struct thread *td = curthread;
struct proc *p = td->td_proc;
struct file *fp;
struct mount *mp;
struct statfs *sp;
int error;
KKASSERT(p);
error = getvnode(p->p_fd, fd, &fp);
if (error)
return (error);
mp = ((struct vnode *)fp->f_data)->v_mount;
if (mp == NULL)
return (EBADF);
sp = &mp->mnt_stat;
error = VFS_STATFS(mp, sp, td);
if (error)
return (error);
sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK;
bcopy(sp, buf, sizeof(*buf));
/* Only root should have access to the fsid's. */
if (suser(td))
buf->f_fsid.val[0] = buf->f_fsid.val[1] = 0;
return (0);
}
/*
* fstatfs_args(int fd, struct statfs *buf)
*
* Get filesystem statistics.
*/
int
fstatfs(struct fstatfs_args *uap)
{
struct statfs buf;
int error;
error = kern_fstatfs(uap->fd, &buf);
if (error == 0)
error = copyout(&buf, uap->buf, sizeof(*uap->buf));
return (error);
}
/*
* getfsstat_args(struct statfs *buf, long bufsize, int flags)
*
* Get statistics on all filesystems.
*/
/* ARGSUSED */
int
getfsstat(struct getfsstat_args *uap)
{
struct thread *td = curthread;
struct mount *mp, *nmp;
struct statfs *sp;
caddr_t sfsp;
lwkt_tokref ilock;
long count, maxcount, error;
maxcount = SCARG(uap, bufsize) / sizeof(struct statfs);
sfsp = (caddr_t)SCARG(uap, buf);
count = 0;
lwkt_gettoken(&ilock, &mountlist_token);
for (mp = TAILQ_FIRST(&mountlist); mp != NULL; mp = nmp) {
if (vfs_busy(mp, LK_NOWAIT, &ilock, td)) {
nmp = TAILQ_NEXT(mp, mnt_list);
continue;
}
if (sfsp && count < maxcount) {
sp = &mp->mnt_stat;
/*
* If MNT_NOWAIT or MNT_LAZY is specified, do not
* refresh the fsstat cache. MNT_NOWAIT or MNT_LAZY
* overrides MNT_WAIT.
*/
if (((SCARG(uap, flags) & (MNT_LAZY|MNT_NOWAIT)) == 0 ||
(SCARG(uap, flags) & MNT_WAIT)) &&
(error = VFS_STATFS(mp, sp, td))) {
lwkt_gettokref(&ilock);
nmp = TAILQ_NEXT(mp, mnt_list);
vfs_unbusy(mp, td);
continue;
}
sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK;
error = copyout((caddr_t)sp, sfsp, sizeof(*sp));
if (error) {
vfs_unbusy(mp, td);
return (error);
}
sfsp += sizeof(*sp);
}
count++;
lwkt_gettokref(&ilock);
nmp = TAILQ_NEXT(mp, mnt_list);
vfs_unbusy(mp, td);
}
lwkt_reltoken(&ilock);
if (sfsp && count > maxcount)
uap->sysmsg_result = maxcount;
else
uap->sysmsg_result = count;
return (0);
}
/*
* fchdir_args(int fd)
*
* Change current working directory to a given file descriptor.
*/
/* ARGSUSED */
int
fchdir(struct fchdir_args *uap)
{
struct thread *td = curthread;
struct proc *p = td->td_proc;
struct filedesc *fdp = p->p_fd;
struct vnode *vp, *tdp;
struct mount *mp;
struct file *fp;
int error;
if ((error = getvnode(fdp, SCARG(uap, fd), &fp)) != 0)
return (error);
vp = (struct vnode *)fp->f_data;
VREF(vp);
vn_lock(vp, NULL, LK_EXCLUSIVE | LK_RETRY, td);
if (vp->v_type != VDIR)
error = ENOTDIR;
else
error = VOP_ACCESS(vp, VEXEC, p->p_ucred, td);
while (!error && (mp = vp->v_mountedhere) != NULL) {
if (vfs_busy(mp, 0, NULL, td))
continue;
error = VFS_ROOT(mp, &tdp);
vfs_unbusy(mp, td);
if (error)
break;
vput(vp);
vp = tdp;
}
if (error) {
vput(vp);
return (error);
}
VOP_UNLOCK(vp, NULL, 0, td);
vrele(fdp->fd_cdir);
fdp->fd_cdir = vp;
return (0);
}
int
kern_chdir(struct nameidata *nd)
{
struct thread *td = curthread;
struct proc *p = td->td_proc;
struct filedesc *fdp = p->p_fd;
int error;
if ((error = namei(nd)) != 0)
return (error);
if ((error = checkvp_chdir(nd->ni_vp, td)) == 0) {
vrele(fdp->fd_cdir);
fdp->fd_cdir = nd->ni_vp;
VREF(fdp->fd_cdir);
}
NDFREE(nd, ~(NDF_NO_FREE_PNBUF | NDF_NO_VP_PUT));
return (error);
}
/*
* chdir_args(char *path)
*
* Change current working directory (``.'').
*/
int
chdir(struct chdir_args *uap)
{
struct thread *td = curthread;
struct nameidata nd;
int error;
NDINIT(&nd, NAMEI_LOOKUP, CNP_FOLLOW | CNP_LOCKLEAF, UIO_USERSPACE,
uap->path, td);
error = kern_chdir(&nd);
return (error);
}
/*
* Helper function for raised chroot(2) security function: Refuse if
* any filedescriptors are open directories.
*/
static int
chroot_refuse_vdir_fds(fdp)
struct filedesc *fdp;
{
struct vnode *vp;
struct file *fp;
int error;
int fd;
for (fd = 0; fd < fdp->fd_nfiles ; fd++) {
error = getvnode(fdp, fd, &fp);
if (error)
continue;
vp = (struct vnode *)fp->f_data;
if (vp->v_type != VDIR)
continue;
return(EPERM);
}
return (0);
}
/*
* This sysctl determines if we will allow a process to chroot(2) if it
* has a directory open:
* 0: disallowed for all processes.
* 1: allowed for processes that were not already chroot(2)'ed.
* 2: allowed for all processes.
*/
static int chroot_allow_open_directories = 1;
SYSCTL_INT(_kern, OID_AUTO, chroot_allow_open_directories, CTLFLAG_RW,
&chroot_allow_open_directories, 0, "");
/*
* Chroot to the specified vnode. vp must be locked and referenced on
* call, and will be left locked and referenced on return. This routine
* may acquire additional refs on the vnode when associating it with
* the process's root and/or jail dirs.
*/
int
kern_chroot(struct vnode *vp)
{
struct thread *td = curthread;
struct proc *p = td->td_proc;
struct filedesc *fdp = p->p_fd;
int error;
/*
* Only root can chroot
*/
if ((error = suser_cred(p->p_ucred, PRISON_ROOT)) != 0)
return (error);
/*
* Disallow open directory descriptors (fchdir() breakouts).
*/
if (chroot_allow_open_directories == 0 ||
(chroot_allow_open_directories == 1 && fdp->fd_rdir != rootvnode)) {
if ((error = chroot_refuse_vdir_fds(fdp)) != 0)
return (error);
}
/*
* Check the validity of vp as a directory to change to and
* associate it with rdir/jdir.
*/
if ((error = checkvp_chdir(vp, td)) == 0) {
vrele(fdp->fd_rdir);
fdp->fd_rdir = vp;
VREF(fdp->fd_rdir);
if (fdp->fd_jdir == NULL) {
fdp->fd_jdir = vp;
VREF(fdp->fd_jdir);
}
}
return (error);
}
/*
* chroot_args(char *path)
*
* Change notion of root (``/'') directory.
*/
/* ARGSUSED */
int
chroot(struct chroot_args *uap)
{
struct thread *td = curthread;
struct nameidata nd;
int error;
KKASSERT(td->td_proc);
NDINIT(&nd, NAMEI_LOOKUP, CNP_FOLLOW | CNP_LOCKLEAF, UIO_USERSPACE,
SCARG(uap, path), td);
if ((error = namei(&nd)) == 0) {
error = kern_chroot(nd.ni_vp);
NDFREE(&nd, ~(NDF_NO_FREE_PNBUF | NDF_NO_VP_PUT));
}
return (error);
}
/*
* Common routine for chroot and chdir. Given a locked, referenced vnode,
* determine whether it is legal to chdir to the vnode. The vnode's state
* is not changed by this call.
*/
int
checkvp_chdir(struct vnode *vp, struct thread *td)
{
int error;
if (vp->v_type != VDIR)
error = ENOTDIR;
else
error = VOP_ACCESS(vp, VEXEC, td->td_proc->p_ucred, td);
return (error);
}
int
kern_open(struct nameidata *nd, int oflags, int mode, int *res)
{
struct thread *td = curthread;
struct proc *p = td->td_proc;
struct filedesc *fdp = p->p_fd;
struct file *fp;
struct vnode *vp;
int cmode, flags;
struct file *nfp;
int type, indx, error;
struct flock lf;
if ((oflags & O_ACCMODE) == O_ACCMODE)
return (EINVAL);
flags = FFLAGS(oflags);
error = falloc(p, &nfp, &indx);
if (error)
return (error);
fp = nfp;
cmode = ((mode &~ fdp->fd_cmask) & ALLPERMS) &~ S_ISTXT;
p->p_dupfd = -indx - 1; /* XXX check for fdopen */
/*
* Bump the ref count to prevent another process from closing
* the descriptor while we are blocked in vn_open()
*/
fhold(fp);
error = vn_open(nd, flags, cmode);
if (error) {
/*
* release our own reference
*/
fdrop(fp, td);
/*
* handle special fdopen() case. bleh. dupfdopen() is
* responsible for dropping the old contents of ofiles[indx]
* if it succeeds.
*/
if ((error == ENODEV || error == ENXIO) &&
p->p_dupfd >= 0 && /* XXX from fdopen */
(error =
dupfdopen(fdp, indx, p->p_dupfd, flags, error)) == 0) {
*res = indx;
return (0);
}
/*
* Clean up the descriptor, but only if another thread hadn't
* replaced or closed it.
*/
if (fdp->fd_ofiles[indx] == fp) {
fdp->fd_ofiles[indx] = NULL;
fdrop(fp, td);
}
if (error == ERESTART)
error = EINTR;
return (error);
}
p->p_dupfd = 0;
NDFREE(nd, NDF_ONLY_PNBUF);
vp = nd->ni_vp;
/*
* There should be 2 references on the file, one from the descriptor
* table, and one for us.
*
* Handle the case where someone closed the file (via its file
* descriptor) while we were blocked. The end result should look
* like opening the file succeeded but it was immediately closed.
*/
if (fp->f_count == 1) {
KASSERT(fdp->fd_ofiles[indx] != fp,
("Open file descriptor lost all refs"));
VOP_UNLOCK(vp, NULL, 0, td);
vn_close(vp, flags & FMASK, td);
fdrop(fp, td);
*res = indx;
return 0;
}
fp->f_data = (caddr_t)vp;
fp->f_flag = flags & FMASK;
fp->f_ops = &vnops;
fp->f_type = (vp->v_type == VFIFO ? DTYPE_FIFO : DTYPE_VNODE);
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, NULL, 0, td);
if ((error = VOP_ADVLOCK(vp, (caddr_t)fp, F_SETLK, &lf, type)) != 0) {
/*
* lock request failed. Normally close the descriptor
* but handle the case where someone might have dup()d
* it when we weren't looking. One reference is
* owned by the descriptor array, the other by us.
*/
if (fdp->fd_ofiles[indx] == fp) {
fdp->fd_ofiles[indx] = NULL;
fdrop(fp, td);
}
fdrop(fp, td);
return (error);
}
vn_lock(vp, NULL, LK_EXCLUSIVE | LK_RETRY, td);
fp->f_flag |= FHASLOCK;
}
/* assert that vn_open created a backing object if one is needed */
KASSERT(!vn_canvmio(vp) || VOP_GETVOBJECT(vp, NULL) == 0,
("open: vmio vnode has no backing object after vn_open"));
VOP_UNLOCK(vp, NULL, 0, td);
/*
* release our private reference, leaving the one associated with the
* descriptor table intact.
*/
fdrop(fp, td);
*res = indx;
return (0);
}
/*
* open_args(char *path, int flags, int mode)
*
* Check permissions, allocate an open file structure,
* and call the device open routine if any.
*/
int
open(struct open_args *uap)
{
struct thread *td = curthread;
struct nameidata nd;
int error;
NDINIT(&nd, NAMEI_LOOKUP, CNP_FOLLOW, UIO_USERSPACE, uap->path, td);
error = kern_open(&nd, uap->flags, uap->mode, &uap->sysmsg_result);
return (error);
}
int
kern_mknod(struct nameidata *nd, int mode, int dev)
{
struct thread *td = curthread;
struct proc *p = td->td_proc;
struct vnode *vp;
struct vattr vattr;
int error;
int whiteout = 0;
KKASSERT(p);
switch (mode & S_IFMT) {
case S_IFCHR:
case S_IFBLK:
error = suser(td);
break;
default:
error = suser_cred(p->p_ucred, PRISON_ROOT);
break;
}
if (error)
return (error);
bwillwrite();
error = namei(nd);
if (error)
return (error);
vp = nd->ni_vp;
if (vp != NULL)
error = EEXIST;
else {
VATTR_NULL(&vattr);
vattr.va_mode = (mode & ALLPERMS) &~ p->p_fd->fd_cmask;
vattr.va_rdev = dev;
whiteout = 0;
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:
whiteout = 1;
break;
default:
error = EINVAL;
break;
}
}
if (error == 0) {
VOP_LEASE(nd->ni_dvp, td, p->p_ucred, LEASE_WRITE);
if (whiteout)
error = VOP_WHITEOUT(nd->ni_dvp, NCPNULL,
&nd->ni_cnd, NAMEI_CREATE);
else {
error = VOP_MKNOD(nd->ni_dvp, NCPNULL, &nd->ni_vp,
&nd->ni_cnd, &vattr);
if (error == 0)
vput(nd->ni_vp);
}
NDFREE(nd, NDF_ONLY_PNBUF);
vput(nd->ni_dvp);
} else {
NDFREE(nd, NDF_ONLY_PNBUF);
if (nd->ni_dvp == vp)
vrele(nd->ni_dvp);
else
vput(nd->ni_dvp);
if (vp)
vrele(vp);
}
ASSERT_VOP_UNLOCKED(nd->ni_dvp, "mknod");
ASSERT_VOP_UNLOCKED(nd->ni_vp, "mknod");
return (error);
}
/*
* mknod_args(char *path, int mode, int dev)
*
* Create a special file.
*/
int
mknod(struct mknod_args *uap)
{
struct thread *td = curthread;
struct nameidata nd;
int error;
NDINIT(&nd, NAMEI_CREATE, CNP_LOCKPARENT, UIO_USERSPACE, uap->path,
td);
error = kern_mknod(&nd, uap->mode, uap->dev);
return (error);
}
int
kern_mkfifo(struct nameidata *nd, int mode)
{
struct thread *td = curthread;
struct proc *p = td->td_proc;
struct vattr vattr;
int error;
bwillwrite();
error = namei(nd);
if (error)
return (error);
if (nd->ni_vp != NULL) {
NDFREE(nd, NDF_ONLY_PNBUF);
if (nd->ni_dvp == nd->ni_vp)
vrele(nd->ni_dvp);
else
vput(nd->ni_dvp);
vrele(nd->ni_vp);
return (EEXIST);
}
VATTR_NULL(&vattr);
vattr.va_type = VFIFO;
vattr.va_mode = (mode & ALLPERMS) &~ p->p_fd->fd_cmask;
VOP_LEASE(nd->ni_dvp, td, p->p_ucred, LEASE_WRITE);
error = VOP_MKNOD(nd->ni_dvp, NCPNULL, &nd->ni_vp, &nd->ni_cnd, &vattr);
if (error == 0)
vput(nd->ni_vp);
NDFREE(nd, NDF_ONLY_PNBUF);
vput(nd->ni_dvp);
return (error);
}
/*
* mkfifo_args(char *path, int mode)
*
* Create a named pipe.
*/
int
mkfifo(struct mkfifo_args *uap)
{
struct thread *td = curthread;
struct nameidata nd;
int error;
NDINIT(&nd, NAMEI_CREATE, CNP_LOCKPARENT, UIO_USERSPACE, uap->path,
td);
error = kern_mkfifo(&nd, uap->mode);
return (error);
}
int
kern_link(struct nameidata *nd, struct nameidata *linknd)
{
struct thread *td = curthread;
struct proc *p = td->td_proc;
struct vnode *vp;
int error;
bwillwrite();
error = namei(nd);
if (error)
return (error);
NDFREE(nd, NDF_ONLY_PNBUF);
vp = nd->ni_vp;
if (vp->v_type == VDIR)
error = EPERM; /* POSIX */
else {
error = namei(linknd);
if (error == 0) {
if (linknd->ni_vp != NULL) {
if (linknd->ni_vp)
vrele(linknd->ni_vp);
error = EEXIST;
} else {
VOP_LEASE(linknd->ni_dvp, td, p->p_ucred,
LEASE_WRITE);
VOP_LEASE(vp, td, p->p_ucred, LEASE_WRITE);
error = VOP_LINK(linknd->ni_dvp, NCPNULL, vp,
&linknd->ni_cnd);
}
NDFREE(linknd, NDF_ONLY_PNBUF);
if (linknd->ni_dvp == linknd->ni_vp)
vrele(linknd->ni_dvp);
else
vput(linknd->ni_dvp);
ASSERT_VOP_UNLOCKED(linknd->ni_dvp, "link");
ASSERT_VOP_UNLOCKED(linknd->ni_vp, "link");
}
}
vrele(vp);
return (error);
}
/*
* link_args(char *path, char *link)
*
* Make a hard file link.
*/
int
link(struct link_args *uap)
{
struct thread *td = curthread;
struct nameidata nd, linknd;
int error;
NDINIT(&nd, NAMEI_LOOKUP, CNP_FOLLOW | CNP_NOOBJ, UIO_USERSPACE,
uap->path, td);
NDINIT(&linknd, NAMEI_CREATE, CNP_LOCKPARENT | CNP_NOOBJ,
UIO_USERSPACE, uap->link, td);
error = kern_link(&nd, &linknd);
return (error);
}
int
kern_symlink(char *path, struct nameidata *nd)
{
struct thread *td = curthread;
struct proc *p = td->td_proc;
struct vattr vattr;
int error;
bwillwrite();
error = namei(nd);
if (error)
return (error);
if (nd->ni_vp) {
NDFREE(nd, NDF_ONLY_PNBUF);
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_mode = ACCESSPERMS &~ p->p_fd->fd_cmask;
VOP_LEASE(nd->ni_dvp, td, p->p_ucred, LEASE_WRITE);
error = VOP_SYMLINK(nd->ni_dvp, NCPNULL, &nd->ni_vp, &nd->ni_cnd,
&vattr, path);
NDFREE(nd, NDF_ONLY_PNBUF);
if (error == 0)
vput(nd->ni_vp);
vput(nd->ni_dvp);
ASSERT_VOP_UNLOCKED(nd->ni_dvp, "symlink");
ASSERT_VOP_UNLOCKED(nd->ni_vp, "symlink");
return (error);
}
/*
* symlink(char *path, char *link)
*
* Make a symbolic link.
*/
int
symlink(struct symlink_args *uap)
{
struct thread *td = curthread;
struct nameidata nd;
char *path;
int error;
path = zalloc(namei_zone);
error = copyinstr(uap->path, path, MAXPATHLEN, NULL);
if (error == 0) {
NDINIT(&nd, NAMEI_CREATE, CNP_LOCKPARENT | CNP_NOOBJ,
UIO_USERSPACE, uap->link, td);
error = kern_symlink(path, &nd);
}
zfree(namei_zone, path);
return (error);
}
/*
* undelete_args(char *path)
*
* Delete a whiteout from the filesystem.
*/
/* ARGSUSED */
int
undelete(struct undelete_args *uap)
{
struct thread *td = curthread;
struct proc *p = td->td_proc;
int error;
struct nameidata nd;
bwillwrite();
NDINIT(&nd, NAMEI_DELETE, CNP_LOCKPARENT | CNP_DOWHITEOUT, UIO_USERSPACE,
SCARG(uap, path), td);
error = namei(&nd);
if (error)
return (error);
if (nd.ni_vp != NULLVP || !(nd.ni_cnd.cn_flags & CNP_ISWHITEOUT)) {
NDFREE(&nd, NDF_ONLY_PNBUF);
if (nd.ni_dvp == nd.ni_vp)
vrele(nd.ni_dvp);
else
vput(nd.ni_dvp);
if (nd.ni_vp)
vrele(nd.ni_vp);
return (EEXIST);
}
VOP_LEASE(nd.ni_dvp, td, p->p_ucred, LEASE_WRITE);
error = VOP_WHITEOUT(nd.ni_dvp, NCPNULL, &nd.ni_cnd, NAMEI_DELETE);
NDFREE(&nd, NDF_ONLY_PNBUF);
vput(nd.ni_dvp);
ASSERT_VOP_UNLOCKED(nd.ni_dvp, "undelete");
ASSERT_VOP_UNLOCKED(nd.ni_vp, "undelete");
return (error);
}
int
kern_unlink(struct nameidata *nd)
{
struct thread *td = curthread;
struct proc *p = td->td_proc;
struct vnode *vp;
int error;
bwillwrite();
error = namei(nd);
if (error)
return (error);
vp = nd->ni_vp;
VOP_LEASE(vp, td, p->p_ucred, LEASE_WRITE);
vn_lock(vp, NULL, LK_EXCLUSIVE | LK_RETRY, td);
if (vp->v_type == VDIR)
error = EPERM; /* POSIX */
else {
/*
* The root of a mounted filesystem cannot be deleted.
*
* XXX: can this only be a VDIR case?
*/
if (vp->v_flag & VROOT)
error = EBUSY;
}
if (error == 0) {
VOP_LEASE(nd->ni_dvp, td, p->p_ucred, LEASE_WRITE);
error = VOP_REMOVE(nd->ni_dvp, NCPNULL, vp, &nd->ni_cnd);
}
NDFREE(nd, NDF_ONLY_PNBUF);
if (nd->ni_dvp == vp)
vrele(nd->ni_dvp);
else
vput(nd->ni_dvp);
if (vp != NULLVP)
vput(vp);
ASSERT_VOP_UNLOCKED(nd->ni_dvp, "unlink");
ASSERT_VOP_UNLOCKED(nd->ni_vp, "unlink");
return (error);
}
/*
* unlink_args(char *path)
*
* Delete a name from the filesystem.
*/
int
unlink(struct unlink_args *uap)
{
struct thread *td = curthread;
struct nameidata nd;
int error;
NDINIT(&nd, NAMEI_DELETE, CNP_LOCKPARENT, UIO_USERSPACE, uap->path,
td);
error = kern_unlink(&nd);
return (error);
}
int
kern_lseek(int fd, off_t offset, int whence, off_t *res)
{
struct thread *td = curthread;
struct proc *p = td->td_proc;
struct filedesc *fdp = p->p_fd;
struct file *fp;
struct vattr vattr;
int error;
if (fd >= fdp->fd_nfiles ||
(fp = fdp->fd_ofiles[fd]) == NULL)
return (EBADF);
if (fp->f_type != DTYPE_VNODE)
return (ESPIPE);
switch (whence) {
case L_INCR:
fp->f_offset += offset;
break;
case L_XTND:
error=VOP_GETATTR((struct vnode *)fp->f_data, &vattr, td);
if (error)
return (error);
fp->f_offset = offset + vattr.va_size;
break;
case L_SET:
fp->f_offset = offset;
break;
default:
return (EINVAL);
}
*res = fp->f_offset;
return (0);
}
/*
* lseek_args(int fd, int pad, off_t offset, int whence)
*
* Reposition read/write file offset.
*/
int
lseek(struct lseek_args *uap)
{
int error;
error = kern_lseek(uap->fd, uap->offset, uap->whence,
&uap->sysmsg_offset);
return (error);
}
int
kern_access(struct nameidata *nd, int aflags)
{
struct thread *td = curthread;
struct proc *p = td->td_proc;
struct ucred *cred, *tmpcred;
struct vnode *vp;
int error, flags;
cred = p->p_ucred;
/*
* Create and modify a temporary credential instead of one that
* is potentially shared. This could also mess up socket
* buffer accounting which can run in an interrupt context.
*/
tmpcred = crdup(cred);
tmpcred->cr_uid = p->p_ucred->cr_ruid;
tmpcred->cr_groups[0] = p->p_ucred->cr_rgid;
p->p_ucred = tmpcred;
nd->ni_cnd.cn_cred = tmpcred;
error = namei(nd);
if (error)
goto out1;
vp = nd->ni_vp;
/* Flags == 0 means only check for existence. */
if (aflags) {
flags = 0;
if (aflags & R_OK)
flags |= VREAD;
if (aflags & W_OK)
flags |= VWRITE;
if (aflags & X_OK)
flags |= VEXEC;
if ((flags & VWRITE) == 0 || (error = vn_writechk(vp)) == 0)
error = VOP_ACCESS(vp, flags, tmpcred, td);
}
NDFREE(nd, NDF_ONLY_PNBUF);
vput(vp);
out1:
p->p_ucred = cred;
crfree(tmpcred);
return (error);
}
/*
* access_args(char *path, int flags)
*
* Check access permissions.
*/
int
access(struct access_args *uap)
{
struct thread *td = curthread;
struct nameidata nd;
int error;
NDINIT(&nd, NAMEI_LOOKUP, CNP_FOLLOW | CNP_LOCKLEAF | CNP_NOOBJ,
UIO_USERSPACE, uap->path, td);
error = kern_access(&nd, uap->flags);
return (error);
}
int
kern_stat(struct nameidata *nd, struct stat *st)
{
struct thread *td = curthread;
int error;
error = namei(nd);
if (error)
return (error);
error = vn_stat(nd->ni_vp, st, td);
NDFREE(nd, NDF_ONLY_PNBUF);
vput(nd->ni_vp);
return (error);
}
/*
* stat_args(char *path, struct stat *ub)
*
* Get file status; this version follows links.
*/
int
stat(struct stat_args *uap)
{
struct thread *td = curthread;
struct nameidata nd;
struct stat st;
int error;
NDINIT(&nd, NAMEI_LOOKUP, CNP_FOLLOW | CNP_LOCKLEAF | CNP_NOOBJ,
UIO_USERSPACE, uap->path, td);
error = kern_stat(&nd, &st);
if (error == 0)
error = copyout(&st, uap->ub, sizeof(*uap->ub));
return (error);
}
/*
* lstat_args(char *path, struct stat *ub)
*
* Get file status; this version does not follow links.
*/
int
lstat(struct lstat_args *uap)
{
struct thread *td = curthread;
struct nameidata nd;
struct stat st;
int error;
NDINIT(&nd, NAMEI_LOOKUP, CNP_LOCKLEAF | CNP_NOOBJ,
UIO_USERSPACE, SCARG(uap, path), td);
error = kern_stat(&nd, &st);
if (error == 0)
error = copyout(&st, uap->ub, sizeof(*uap->ub));
return (error);
}
void
cvtnstat(sb, nsb)
struct stat *sb;
struct nstat *nsb;
{
nsb->st_dev = sb->st_dev;
nsb->st_ino = sb->st_ino;
nsb->st_mode = sb->st_mode;
nsb->st_nlink = sb->st_nlink;
nsb->st_uid = sb->st_uid;
nsb->st_gid = sb->st_gid;
nsb->st_rdev = sb->st_rdev;
nsb->st_atimespec = sb->st_atimespec;
nsb->st_mtimespec = sb->st_mtimespec;
nsb->st_ctimespec = sb->st_ctimespec;
nsb->st_size = sb->st_size;
nsb->st_blocks = sb->st_blocks;
nsb->st_blksize = sb->st_blksize;
nsb->st_flags = sb->st_flags;
nsb->st_gen = sb->st_gen;
nsb->st_qspare[0] = sb->st_qspare[0];
nsb->st_qspare[1] = sb->st_qspare[1];
}
/*
* nstat_args(char *path, struct nstat *ub)
*/
/* ARGSUSED */
int
nstat(struct nstat_args *uap)
{
struct thread *td = curthread;
struct stat sb;
struct nstat nsb;
int error;
struct nameidata nd;
NDINIT(&nd, NAMEI_LOOKUP, CNP_FOLLOW | CNP_LOCKLEAF | CNP_NOOBJ,
UIO_USERSPACE, SCARG(uap, path), td);
if ((error = namei(&nd)) != 0)
return (error);
NDFREE(&nd, NDF_ONLY_PNBUF);
error = vn_stat(nd.ni_vp, &sb, td);
vput(nd.ni_vp);
if (error)
return (error);
cvtnstat(&sb, &nsb);
error = copyout((caddr_t)&nsb, (caddr_t)SCARG(uap, ub), sizeof (nsb));
return (error);
}
/*
* lstat_args(char *path, struct stat *ub)
*
* Get file status; this version does not follow links.
*/
/* ARGSUSED */
int
nlstat(struct nlstat_args *uap)
{
struct thread *td = curthread;
int error;
struct vnode *vp;
struct stat sb;
struct nstat nsb;
struct nameidata nd;
NDINIT(&nd, NAMEI_LOOKUP, CNP_LOCKLEAF | CNP_NOOBJ,
UIO_USERSPACE, SCARG(uap, path), td);
if ((error = namei(&nd)) != 0)
return (error);
vp = nd.ni_vp;
NDFREE(&nd, NDF_ONLY_PNBUF);
error = vn_stat(vp, &sb, td);
vput(vp);
if (error)
return (error);
cvtnstat(&sb, &nsb);
error = copyout((caddr_t)&nsb, (caddr_t)SCARG(uap, ub), sizeof (nsb));
return (error);
}
/*
* pathconf_Args(char *path, int name)
*
* Get configurable pathname variables.
*/
/* ARGSUSED */
int
pathconf(struct pathconf_args *uap)
{
struct thread *td = curthread;
int error;
struct nameidata nd;
NDINIT(&nd, NAMEI_LOOKUP, CNP_FOLLOW | CNP_LOCKLEAF | CNP_NOOBJ,
UIO_USERSPACE, SCARG(uap, path), td);
if ((error = namei(&nd)) != 0)
return (error);
NDFREE(&nd, NDF_ONLY_PNBUF);
error = VOP_PATHCONF(nd.ni_vp, SCARG(uap, name), uap->sysmsg_fds);
vput(nd.ni_vp);
return (error);
}
/*
* XXX: daver
* kern_readlink isn't properly split yet. There is a copyin burried
* in VOP_READLINK().
*/
int
kern_readlink(struct nameidata *nd, char *buf, int count, int *res)
{
struct thread *td = curthread;
struct proc *p = td->td_proc;
struct vnode *vp;
struct iovec aiov;
struct uio auio;
int error;
error = namei(nd);
if (error)
return (error);
NDFREE(nd, NDF_ONLY_PNBUF);
vp = nd->ni_vp;
if (vp->v_type != VLNK)
error = EINVAL;
else {
aiov.iov_base = buf;
aiov.iov_len = 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_td = td;
auio.uio_resid = count;
error = VOP_READLINK(vp, &auio, p->p_ucred);
}
vput(vp);
*res = count - auio.uio_resid;
return (error);
}
/*
* readlink_args(char *path, char *buf, int count)
*
* Return target name of a symbolic link.
*/
int
readlink(struct readlink_args *uap)
{
struct thread *td = curthread;
struct nameidata nd;
int error;
NDINIT(&nd, NAMEI_LOOKUP, CNP_LOCKLEAF | CNP_NOOBJ, UIO_USERSPACE,
uap->path, td);
error = kern_readlink(&nd, uap->buf, uap->count,
&uap->sysmsg_result);
return (error);
}
static int
setfflags(struct vnode *vp, int flags)
{
struct thread *td = curthread;
struct proc *p = td->td_proc;
int error;
struct vattr vattr;
/*
* Prevent non-root users from setting flags on devices. When
* a device is reused, users can retain ownership of the device
* if they are allowed to set flags and programs assume that
* chown can't fail when done as root.
*/
if ((vp->v_type == VCHR || vp->v_type == VBLK) &&
((error = suser_cred(p->p_ucred, PRISON_ROOT)) != 0))
return (error);
VOP_LEASE(vp, td, p->p_ucred, LEASE_WRITE);
vn_lock(vp, NULL, LK_EXCLUSIVE | LK_RETRY, td);
VATTR_NULL(&vattr);
vattr.va_flags = flags;
error = VOP_SETATTR(vp, &vattr, p->p_ucred, td);
VOP_UNLOCK(vp, NULL, 0, td);
return (error);
}
/*
* chflags(char *path, int flags)
*
* Change flags of a file given a path name.
*/
/* ARGSUSED */
int
chflags(struct chflags_args *uap)
{
struct thread *td = curthread;
int error;
struct nameidata nd;
NDINIT(&nd, NAMEI_LOOKUP, CNP_FOLLOW, UIO_USERSPACE,
SCARG(uap, path), td);
if ((error = namei(&nd)) != 0)
return (error);
NDFREE(&nd, NDF_ONLY_PNBUF);
error = setfflags(nd.ni_vp, SCARG(uap, flags));
vrele(nd.ni_vp);
return error;
}
/*
* fchflags_args(int fd, int flags)
*
* Change flags of a file given a file descriptor.
*/
/* ARGSUSED */
int
fchflags(struct fchflags_args *uap)
{
struct thread *td = curthread;
struct proc *p = td->td_proc;
struct file *fp;
int error;
if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0)
return (error);
return setfflags((struct vnode *) fp->f_data, SCARG(uap, flags));
}
static int
setfmode(struct vnode *vp, int mode)
{
struct thread *td = curthread;
struct proc *p = td->td_proc;
int error;
struct vattr vattr;
VOP_LEASE(vp, td, p->p_ucred, LEASE_WRITE);
vn_lock(vp, NULL, LK_EXCLUSIVE | LK_RETRY, td);
VATTR_NULL(&vattr);
vattr.va_mode = mode & ALLPERMS;
error = VOP_SETATTR(vp, &vattr, p->p_ucred, td);
VOP_UNLOCK(vp, NULL, 0, td);
return error;
}
int
kern_chmod(struct nameidata *nd, int mode)
{
int error;
error = namei(nd);
if (error)
return (error);
NDFREE(nd, NDF_ONLY_PNBUF);
error = setfmode(nd->ni_vp, mode);
vrele(nd->ni_vp);
return error;
}
/*
* chmod_args(char *path, int mode)
*
* Change mode of a file given path name.
*/
/* ARGSUSED */
int
chmod(struct chmod_args *uap)
{
struct thread *td = curthread;
struct nameidata nd;
int error;
NDINIT(&nd, NAMEI_LOOKUP, CNP_FOLLOW, UIO_USERSPACE, uap->path, td);
error = kern_chmod(&nd, uap->mode);
return (error);
}
/*
* lchmod_args(char *path, int mode)
*
* Change mode of a file given path name (don't follow links.)
*/
/* ARGSUSED */
int
lchmod(struct lchmod_args *uap)
{
struct thread *td = curthread;
int error;
struct nameidata nd;
NDINIT(&nd, NAMEI_LOOKUP, 0, UIO_USERSPACE, SCARG(uap, path), td);
if ((error = namei(&nd)) != 0)
return (error);
NDFREE(&nd, NDF_ONLY_PNBUF);
error = setfmode(nd.ni_vp, SCARG(uap, mode));
vrele(nd.ni_vp);
return error;
}
/*
* fchmod_args(int fd, int mode)
*
* Change mode of a file given a file descriptor.
*/
/* ARGSUSED */
int
fchmod(struct fchmod_args *uap)
{
struct thread *td = curthread;
struct proc *p = td->td_proc;
struct file *fp;
int error;
if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0)
return (error);
return setfmode((struct vnode *)fp->f_data, SCARG(uap, mode));
}
static int
setfown(struct vnode *vp, uid_t uid, gid_t gid)
{
struct thread *td = curthread;
struct proc *p = td->td_proc;
int error;
struct vattr vattr;
VOP_LEASE(vp, td, p->p_ucred, LEASE_WRITE);
vn_lock(vp, NULL, LK_EXCLUSIVE | LK_RETRY, td);
VATTR_NULL(&vattr);
vattr.va_uid = uid;
vattr.va_gid = gid;
error = VOP_SETATTR(vp, &vattr, p->p_ucred, td);
VOP_UNLOCK(vp, NULL, 0, td);
return error;
}
int
kern_chown(struct nameidata *nd, int uid, int gid)
{
int error;
error = namei(nd);
if (error)
return (error);
NDFREE(nd, NDF_ONLY_PNBUF);
error = setfown(nd->ni_vp, uid, gid);
vrele(nd->ni_vp);
return (error);
}
/*
* chown(char *path, int uid, int gid)
*
* Set ownership given a path name.
*/
int
chown(struct chown_args *uap)
{
struct thread *td = curthread;
struct nameidata nd;
int error;
NDINIT(&nd, NAMEI_LOOKUP, CNP_FOLLOW, UIO_USERSPACE, uap->path, td);
error = kern_chown(&nd, uap->uid, uap->gid);
return (error);
}
/*
* lchown_args(char *path, int uid, int gid)
*
* Set ownership given a path name, do not cross symlinks.
*/
int
lchown(struct lchown_args *uap)
{
struct thread *td = curthread;
int error;
struct nameidata nd;
NDINIT(&nd, NAMEI_LOOKUP, 0, UIO_USERSPACE, uap->path, td);
error = kern_chown(&nd, uap->uid, uap->gid);
return (error);
}
/*
* fchown_args(int fd, int uid, int gid)
*
* Set ownership given a file descriptor.
*/
/* ARGSUSED */
int
fchown(struct fchown_args *uap)
{
struct thread *td = curthread;
struct proc *p = td->td_proc;
struct file *fp;
int error;
if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0)
return (error);
return setfown((struct vnode *)fp->f_data,
SCARG(uap, uid), SCARG(uap, gid));
}
static int
getutimes(const struct timeval *tvp, struct timespec *tsp)
{
struct timeval tv[2];
if (tvp == NULL) {
microtime(&tv[0]);
TIMEVAL_TO_TIMESPEC(&tv[0], &tsp[0]);
tsp[1] = tsp[0];
} else {
TIMEVAL_TO_TIMESPEC(&tvp[0], &tsp[0]);
TIMEVAL_TO_TIMESPEC(&tvp[1], &tsp[1]);
}
return 0;
}
static int
setutimes(struct vnode *vp, const struct timespec *ts, int nullflag)
{
struct thread *td = curthread;
struct proc *p = td->td_proc;
int error;
struct vattr vattr;
VOP_LEASE(vp, td, p->p_ucred, LEASE_WRITE);
vn_lock(vp, NULL, LK_EXCLUSIVE | LK_RETRY, td);
VATTR_NULL(&vattr);
vattr.va_atime = ts[0];
vattr.va_mtime = ts[1];
if (nullflag)
vattr.va_vaflags |= VA_UTIMES_NULL;
error = VOP_SETATTR(vp, &vattr, p->p_ucred, td);
VOP_UNLOCK(vp, NULL, 0, td);
return error;
}
int
kern_utimes(struct nameidata *nd, struct timeval *tptr)
{
struct timespec ts[2];
int error;
error = getutimes(tptr, ts);
if (error)
return (error);
error = namei(nd);
if (error)
return (error);
NDFREE(nd, NDF_ONLY_PNBUF);
error = setutimes(nd->ni_vp, ts, tptr == NULL);
vrele(nd->ni_vp);
return (error);
}
/*
* utimes_args(char *path, struct timeval *tptr)
*
* Set the access and modification times of a file.
*/
int
utimes(struct utimes_args *uap)
{
struct thread *td = curthread;
struct timeval tv[2];
struct nameidata nd;
int error;
if (uap->tptr) {
error = copyin(uap->tptr, tv, sizeof(tv));
if (error)
return (error);
}
NDINIT(&nd, NAMEI_LOOKUP, CNP_FOLLOW, UIO_USERSPACE, uap->path, td);
error = kern_utimes(&nd, uap->tptr ? tv : NULL);
return (error);
}
/*
* lutimes_args(char *path, struct timeval *tptr)
*
* Set the access and modification times of a file.
*/
int
lutimes(struct lutimes_args *uap)
{
struct thread *td = curthread;
struct timeval tv[2];
struct nameidata nd;
int error;
if (uap->tptr) {
error = copyin(uap->tptr, tv, sizeof(tv));
if (error)
return (error);
}
NDINIT(&nd, NAMEI_LOOKUP, 0, UIO_USERSPACE, uap->path, td);
error = kern_utimes(&nd, uap->tptr ? tv : NULL);
return (error);
}
int
kern_futimes(int fd, struct timeval *tptr)
{
struct thread *td = curthread;
struct proc *p = td->td_proc;
struct timespec ts[2];
struct file *fp;
int error;
error = getutimes(tptr, ts);
if (error)
return (error);
error = getvnode(p->p_fd, fd, &fp);
if (error)
return (error);
error = setutimes((struct vnode *)fp->f_data, ts, tptr == NULL);
return (error);
}
/*
* futimes_args(int fd, struct timeval *tptr)
*
* Set the access and modification times of a file.
*/
int
futimes(struct futimes_args *uap)
{
struct timeval tv[2];
int error;
if (uap->tptr) {
error = copyin(uap->tptr, tv, sizeof(tv));
if (error)
return (error);
}
error = kern_futimes(uap->fd, uap->tptr ? tv : NULL);
return (error);
}
int
kern_truncate(struct nameidata* nd, off_t length)
{
struct thread *td = curthread;
struct proc *p = td->td_proc;
struct vnode *vp;
struct vattr vattr;
int error;
if (length < 0)
return(EINVAL);
if ((error = namei(nd)) != 0)
return (error);
vp = nd->ni_vp;
NDFREE(nd, NDF_ONLY_PNBUF);
VOP_LEASE(vp, td, p->p_ucred, LEASE_WRITE);
vn_lock(vp, NULL, LK_EXCLUSIVE | LK_RETRY, td);
if (vp->v_type == VDIR)
error = EISDIR;
else if ((error = vn_writechk(vp)) == 0 &&
(error = VOP_ACCESS(vp, VWRITE, p->p_ucred, td)) == 0) {
VATTR_NULL(&vattr);
vattr.va_size = length;
error = VOP_SETATTR(vp, &vattr, p->p_ucred, td);
}
vput(vp);
return (error);
}
/*
* truncate(char *path, int pad, off_t length)
*
* Truncate a file given its path name.
*/
int
truncate(struct truncate_args *uap)
{
struct thread *td = curthread;
struct nameidata nd;
int error;
NDINIT(&nd, NAMEI_LOOKUP, CNP_FOLLOW, UIO_USERSPACE, uap->path, td);
error = kern_truncate(&nd, uap->length);
return error;
}
int
kern_ftruncate(int fd, off_t length)
{
struct thread *td = curthread;
struct proc *p = td->td_proc;
struct vattr vattr;
struct vnode *vp;
struct file *fp;
int error;
if (length < 0)
return(EINVAL);
if ((error = getvnode(p->p_fd, fd, &fp)) != 0)
return (error);
if ((fp->f_flag & FWRITE) == 0)
return (EINVAL);
vp = (struct vnode *)fp->f_data;
VOP_LEASE(vp, td, p->p_ucred, LEASE_WRITE);
vn_lock(vp, NULL, LK_EXCLUSIVE | LK_RETRY, td);
if (vp->v_type == VDIR)
error = EISDIR;
else if ((error = vn_writechk(vp)) == 0) {
VATTR_NULL(&vattr);
vattr.va_size = length;
error = VOP_SETATTR(vp, &vattr, fp->f_cred, td);
}
VOP_UNLOCK(vp, NULL, 0, td);
return (error);
}
/*
* ftruncate_args(int fd, int pad, off_t length)
*
* Truncate a file given a file descriptor.
*/
int
ftruncate(struct ftruncate_args *uap)
{
int error;
error = kern_ftruncate(uap->fd, uap->length);
return (error);
}
/*
* fsync(int fd)
*
* Sync an open file.
*/
/* ARGSUSED */
int
fsync(struct fsync_args *uap)
{
struct thread *td = curthread;
struct proc *p = td->td_proc;
struct vnode *vp;
struct file *fp;
vm_object_t obj;
int error;
if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0)
return (error);
vp = (struct vnode *)fp->f_data;
vn_lock(vp, NULL, LK_EXCLUSIVE | LK_RETRY, td);
if (VOP_GETVOBJECT(vp, &obj) == 0)
vm_object_page_clean(obj, 0, 0, 0);
if ((error = VOP_FSYNC(vp, MNT_WAIT, td)) == 0 &&
vp->v_mount && (vp->v_mount->mnt_flag & MNT_SOFTDEP) &&
bioops.io_fsync)
error = (*bioops.io_fsync)(vp);
VOP_UNLOCK(vp, NULL, 0, td);
return (error);
}
int
kern_rename(struct nameidata *fromnd, struct nameidata *tond)
{
struct thread *td = curthread;
struct proc *p = td->td_proc;
struct vnode *tvp, *fvp, *tdvp;
int error;
bwillwrite();
error = namei(fromnd);
if (error)
return (error);
fvp = fromnd->ni_vp;
if (fromnd->ni_vp->v_type == VDIR)
tond->ni_cnd.cn_flags |= CNP_WILLBEDIR;
error = namei(tond);
if (error) {
/* Translate error code for rename("dir1", "dir2/."). */
if (error == EISDIR && fvp->v_type == VDIR)
error = EINVAL;
NDFREE(fromnd, NDF_ONLY_PNBUF);
vrele(fromnd->ni_dvp);
vrele(fvp);
goto out1;
}
tdvp = tond->ni_dvp;
tvp = tond->ni_vp;
if (tvp != NULL) {
if (fvp->v_type == VDIR && tvp->v_type != VDIR) {
error = ENOTDIR;
goto out;
} else if (fvp->v_type != VDIR && tvp->v_type == VDIR) {
error = EISDIR;
goto out;
}
}
if (fvp == tdvp)
error = EINVAL;
/*
* If the source is the same as the destination (that is, if they
* are links to the same vnode), then there is nothing to do.
*/
if (fvp == tvp)
error = -1;
out:
if (!error) {
VOP_LEASE(tdvp, td, p->p_ucred, LEASE_WRITE);
if (fromnd->ni_dvp != tdvp) {
VOP_LEASE(fromnd->ni_dvp, td, p->p_ucred, LEASE_WRITE);
}
if (tvp) {
VOP_LEASE(tvp, td, p->p_ucred, LEASE_WRITE);
}
error = VOP_RENAME(fromnd->ni_dvp, NCPNULL, fromnd->ni_vp,
&fromnd->ni_cnd, tond->ni_dvp, NCPNULL, tond->ni_vp,
&tond->ni_cnd);
NDFREE(fromnd, NDF_ONLY_PNBUF);
NDFREE(tond, NDF_ONLY_PNBUF);
} else {
NDFREE(fromnd, NDF_ONLY_PNBUF);
NDFREE(tond, NDF_ONLY_PNBUF);
if (tdvp == tvp)
vrele(tdvp);
else
vput(tdvp);
if (tvp)
vput(tvp);
vrele(fromnd->ni_dvp);
vrele(fvp);
}
vrele(tond->ni_startdir);
ASSERT_VOP_UNLOCKED(fromnd->ni_dvp, "rename");
ASSERT_VOP_UNLOCKED(fromnd->ni_vp, "rename");
ASSERT_VOP_UNLOCKED(tond->ni_dvp, "rename");
ASSERT_VOP_UNLOCKED(tond->ni_vp, "rename");
out1:
if (fromnd->ni_startdir)
vrele(fromnd->ni_startdir);
if (error == -1)
return (0);
return (error);
}
/*
* rename_args(char *from, char *to)
*
* Rename files. Source and destination must either both be directories,
* or both not be directories. If target is a directory, it must be empty.
*/
int
rename(struct rename_args *uap)
{
struct thread *td = curthread;
struct nameidata fromnd, tond;
int error;
NDINIT(&fromnd, NAMEI_DELETE, CNP_WANTPARENT | CNP_SAVESTART,
UIO_USERSPACE, uap->from, td);
NDINIT(&tond, NAMEI_RENAME,
CNP_LOCKPARENT | CNP_LOCKLEAF | CNP_NOCACHE |
CNP_SAVESTART | CNP_NOOBJ,
UIO_USERSPACE, uap->to, td);
error = kern_rename(&fromnd, &tond);
return (error);
}
int
kern_mkdir(struct nameidata *nd, int mode)
{
struct thread *td = curthread;
struct proc *p = td->td_proc;
struct vnode *vp;
struct vattr vattr;
int error;
bwillwrite();
nd->ni_cnd.cn_flags |= CNP_WILLBEDIR;
error = namei(nd);
if (error)
return (error);
vp = nd->ni_vp;
if (vp) {
NDFREE(nd, NDF_ONLY_PNBUF);
if (nd->ni_dvp == vp)
vrele(nd->ni_dvp);
else
vput(nd->ni_dvp);
vrele(vp);
return (EEXIST);
}
VATTR_NULL(&vattr);
vattr.va_type = VDIR;
vattr.va_mode = (mode & ACCESSPERMS) &~ p->p_fd->fd_cmask;
VOP_LEASE(nd->ni_dvp, td, p->p_ucred, LEASE_WRITE);
error = VOP_MKDIR(nd->ni_dvp, NCPNULL, &nd->ni_vp, &nd->ni_cnd,
&vattr);
NDFREE(nd, NDF_ONLY_PNBUF);
vput(nd->ni_dvp);
if (error == 0)
vput(nd->ni_vp);
ASSERT_VOP_UNLOCKED(nd->ni_dvp, "mkdir");
ASSERT_VOP_UNLOCKED(nd->ni_vp, "mkdir");
return (error);
}
/*
* mkdir_args(char *path, int mode)
*
* Make a directory file.
*/
/* ARGSUSED */
int
mkdir(struct mkdir_args *uap)
{
struct thread *td = curthread;
struct nameidata nd;
int error;
NDINIT(&nd, NAMEI_CREATE, CNP_LOCKPARENT, UIO_USERSPACE, uap->path,
td);
error = kern_mkdir(&nd, uap->mode);
return (error);
}
int
kern_rmdir(struct nameidata *nd)
{
struct thread *td = curthread;
struct proc *p = td->td_proc;
struct vnode *vp;
int error;
bwillwrite();
error = namei(nd);
if (error)
return (error);
vp = nd->ni_vp;
if (vp->v_type != VDIR) {
error = ENOTDIR;
goto out;
}
/*
* No rmdir "." please.
*/
if (nd->ni_dvp == vp) {
error = EINVAL;
goto out;
}
/*
* The root of a mounted filesystem cannot be deleted.
*/
if (vp->v_flag & VROOT)
error = EBUSY;
else {
VOP_LEASE(nd->ni_dvp, td, p->p_ucred, LEASE_WRITE);
VOP_LEASE(vp, td, p->p_ucred, LEASE_WRITE);
error = VOP_RMDIR(nd->ni_dvp, NCPNULL, nd->ni_vp,
&nd->ni_cnd);
}
out:
NDFREE(nd, NDF_ONLY_PNBUF);
if (nd->ni_dvp == vp)
vrele(nd->ni_dvp);
else
vput(nd->ni_dvp);
if (vp != NULLVP)
vput(vp);
ASSERT_VOP_UNLOCKED(nd->ni_dvp, "rmdir");
ASSERT_VOP_UNLOCKED(nd->ni_vp, "rmdir");
return (error);
}
/*
* rmdir_args(char *path)
*
* Remove a directory file.
*/
/* ARGSUSED */
int
rmdir(struct rmdir_args *uap)
{
struct thread *td = curthread;
struct nameidata nd;
int error;
NDINIT(&nd, NAMEI_DELETE, CNP_LOCKPARENT | CNP_LOCKLEAF,
UIO_USERSPACE, uap->path, td);
error = kern_rmdir(&nd);
return (error);
}
int
kern_getdirentries(int fd, char *buf, u_int count, long *basep, int *res)
{
struct thread *td = curthread;
struct proc *p = td->td_proc;
struct vnode *vp;
struct file *fp;
struct uio auio;
struct iovec aiov;
long loff;
int error, eofflag;
if ((error = getvnode(p->p_fd, fd, &fp)) != 0)
return (error);
if ((fp->f_flag & FREAD) == 0)
return (EBADF);
vp = (struct vnode *)fp->f_data;
unionread:
if (vp->v_type != VDIR)
return (EINVAL);
aiov.iov_base = buf;
aiov.iov_len = count;
auio.uio_iov = &aiov;
auio.uio_iovcnt = 1;
auio.uio_rw = UIO_READ;
auio.uio_segflg = UIO_USERSPACE;
auio.uio_td = td;
auio.uio_resid = count;
/* vn_lock(vp, NULL, LK_SHARED | LK_RETRY, td); */
vn_lock(vp, NULL, LK_EXCLUSIVE | LK_RETRY, td);
loff = auio.uio_offset = fp->f_offset;
error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag, NULL, NULL);
fp->f_offset = auio.uio_offset;
VOP_UNLOCK(vp, NULL, 0, td);
if (error)
return (error);
if (count == auio.uio_resid) {
if (union_dircheckp) {
error = union_dircheckp(td, &vp, fp);
if (error == -1)
goto unionread;
if (error)
return (error);
}
if ((vp->v_flag & VROOT) &&
(vp->v_mount->mnt_flag & MNT_UNION)) {
struct vnode *tvp = vp;
vp = vp->v_mount->mnt_vnodecovered;
VREF(vp);
fp->f_data = (caddr_t) vp;
fp->f_offset = 0;
vrele(tvp);
goto unionread;
}
}
if (basep) {
*basep = loff;
}
*res = count - auio.uio_resid;
return (error);
}
/*
* getdirentries_args(int fd, char *buf, u_int conut, long *basep)
*
* Read a block of directory entries in a file system independent format.
*/
int
getdirentries(struct getdirentries_args *uap)
{
long base;
int error;
error = kern_getdirentries(uap->fd, uap->buf, uap->count, &base,
&uap->sysmsg_result);
if (error == 0)
error = copyout(&base, uap->basep, sizeof(*uap->basep));
return (error);
}
/*
* getdents_args(int fd, char *buf, size_t count)
*/
int
getdents(struct getdents_args *uap)
{
int error;
error = kern_getdirentries(uap->fd, uap->buf, uap->count, NULL,
&uap->sysmsg_result);
return (error);
}
/*
* umask(int newmask)
*
* Set the mode mask for creation of filesystem nodes.
*
* MP SAFE
*/
int
umask(struct umask_args *uap)
{
struct thread *td = curthread;
struct proc *p = td->td_proc;
struct filedesc *fdp;
fdp = p->p_fd;
uap->sysmsg_result = fdp->fd_cmask;
fdp->fd_cmask = SCARG(uap, newmask) & ALLPERMS;
return (0);
}
/*
* revoke(char *path)
*
* Void all references to file by ripping underlying filesystem
* away from vnode.
*/
/* ARGSUSED */
int
revoke(struct revoke_args *uap)
{
struct thread *td = curthread;
struct proc *p = td->td_proc;
struct vnode *vp;
struct vattr vattr;
int error;
struct nameidata nd;
NDINIT(&nd, NAMEI_LOOKUP, CNP_FOLLOW, UIO_USERSPACE, SCARG(uap, path), td);
if ((error = namei(&nd)) != 0)
return (error);
vp = nd.ni_vp;
NDFREE(&nd, NDF_ONLY_PNBUF);
if (vp->v_type != VCHR && vp->v_type != VBLK) {
error = EINVAL;
goto out;
}
if ((error = VOP_GETATTR(vp, &vattr, td)) != 0)
goto out;
if (p->p_ucred->cr_uid != vattr.va_uid &&
(error = suser_cred(p->p_ucred, PRISON_ROOT)))
goto out;
if (vcount(vp) > 1)
VOP_REVOKE(vp, REVOKEALL);
out:
vrele(vp);
return (error);
}
/*
* Convert a user file descriptor to a kernel file entry.
*/
int
getvnode(struct filedesc *fdp, int fd, struct file **fpp)
{
struct file *fp;
if ((u_int)fd >= fdp->fd_nfiles ||
(fp = fdp->fd_ofiles[fd]) == NULL)
return (EBADF);
if (fp->f_type != DTYPE_VNODE && fp->f_type != DTYPE_FIFO)
return (EINVAL);
*fpp = fp;
return (0);
}
/*
* getfh_args(char *fname, fhandle_t *fhp)
*
* Get (NFS) file handle
*/
int
getfh(struct getfh_args *uap)
{
struct thread *td = curthread;
struct nameidata nd;
fhandle_t fh;
struct vnode *vp;
int error;
/*
* Must be super user
*/
error = suser(td);
if (error)
return (error);
NDINIT(&nd, NAMEI_LOOKUP, CNP_FOLLOW | CNP_LOCKLEAF, UIO_USERSPACE, uap->fname, td);
error = namei(&nd);
if (error)
return (error);
NDFREE(&nd, NDF_ONLY_PNBUF);
vp = nd.ni_vp;
bzero(&fh, 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, uap->fhp, sizeof (fh));
return (error);
}
/*
* fhopen_args(const struct fhandle *u_fhp, int flags)
*
* syscall for the rpc.lockd to use to translate a NFS file handle into
* an open descriptor.
*
* warning: do not remove the suser() call or this becomes one giant
* security hole.
*/
int
fhopen(struct fhopen_args *uap)
{
struct thread *td = curthread;
struct proc *p = td->td_proc;
struct mount *mp;
struct vnode *vp;
struct fhandle fhp;
struct vattr vat;
struct vattr *vap = &vat;
struct flock lf;
struct file *fp;
struct filedesc *fdp = p->p_fd;
int fmode, mode, error, type;
struct file *nfp;
int indx;
/*
* Must be super user
*/
error = suser(td);
if (error)
return (error);
fmode = FFLAGS(SCARG(uap, flags));
/* why not allow a non-read/write open for our lockd? */
if (((fmode & (FREAD | FWRITE)) == 0) || (fmode & O_CREAT))
return (EINVAL);
error = copyin(SCARG(uap,u_fhp), &fhp, sizeof(fhp));
if (error)
return(error);
/* find the mount point */
mp = vfs_getvfs(&fhp.fh_fsid);
if (mp == NULL)
return (ESTALE);
/* now give me my vnode, it gets returned to me locked */
error = VFS_FHTOVP(mp, &fhp.fh_fid, &vp);
if (error)
return (error);
/*
* from now on we have to make sure not
* to forget about the vnode
* any error that causes an abort must vput(vp)
* just set error = err and 'goto bad;'.
*/
/*
* from vn_open
*/
if (vp->v_type == VLNK) {
error = EMLINK;
goto bad;
}
if (vp->v_type == VSOCK) {
error = EOPNOTSUPP;
goto bad;
}
mode = 0;
if (fmode & (FWRITE | O_TRUNC)) {
if (vp->v_type == VDIR) {
error = EISDIR;
goto bad;
}
error = vn_writechk(vp);
if (error)
goto bad;
mode |= VWRITE;
}
if (fmode & FREAD)
mode |= VREAD;
if (mode) {
error = VOP_ACCESS(vp, mode, p->p_ucred, td);
if (error)
goto bad;
}
if (fmode & O_TRUNC) {
VOP_UNLOCK(vp, NULL, 0, td); /* XXX */
VOP_LEASE(vp, td, p->p_ucred, LEASE_WRITE);
vn_lock(vp, NULL, LK_EXCLUSIVE | LK_RETRY, td); /* XXX */
VATTR_NULL(vap);
vap->va_size = 0;
error = VOP_SETATTR(vp, vap, p->p_ucred, td);
if (error)
goto bad;
}
error = VOP_OPEN(vp, fmode, p->p_ucred, td);
if (error)
goto bad;
/*
* Make sure that a VM object is created for VMIO support.
*/
if (vn_canvmio(vp) == TRUE) {
if ((error = vfs_object_create(vp, td)) != 0)
goto bad;
}
if (fmode & FWRITE)
vp->v_writecount++;
/*
* end of vn_open code
*/
if ((error = falloc(p, &nfp, &indx)) != 0) {
if (fmode & FWRITE)
vp->v_writecount--;
goto bad;
}
fp = nfp;
/*
* hold an extra reference to avoid having fp ripped out
* from under us while we block in the lock op.
*/
fhold(fp);
nfp->f_data = (caddr_t)vp;
nfp->f_flag = fmode & FMASK;
nfp->f_ops = &vnops;
nfp->f_type = DTYPE_VNODE;
if (fmode & (O_EXLOCK | O_SHLOCK)) {
lf.l_whence = SEEK_SET;
lf.l_start = 0;
lf.l_len = 0;
if (fmode & O_EXLOCK)
lf.l_type = F_WRLCK;
else
lf.l_type = F_RDLCK;
type = F_FLOCK;
if ((fmode & FNONBLOCK) == 0)
type |= F_WAIT;
VOP_UNLOCK(vp, NULL, 0, td);
if ((error = VOP_ADVLOCK(vp, (caddr_t)fp, F_SETLK, &lf, type)) != 0) {
/*
* lock request failed. Normally close the descriptor
* but handle the case where someone might have dup()d
* or close()d it when we weren't looking.
*/
if (fdp->fd_ofiles[indx] == fp) {
fdp->fd_ofiles[indx] = NULL;
fdrop(fp, td);
}
/*
* release our private reference.
*/
fdrop(fp, td);
return (error);
}
vn_lock(vp, NULL, LK_EXCLUSIVE | LK_RETRY, td);
fp->f_flag |= FHASLOCK;
}
if ((vp->v_type == VREG) && (VOP_GETVOBJECT(vp, NULL) != 0))
vfs_object_create(vp, td);
VOP_UNLOCK(vp, NULL, 0, td);
fdrop(fp, td);
uap->sysmsg_result = indx;
return (0);
bad:
vput(vp);
return (error);
}
/*
* fhstat_args(struct fhandle *u_fhp, struct stat *sb)
*/
int
fhstat(struct fhstat_args *uap)
{
struct thread *td = curthread;
struct stat sb;
fhandle_t fh;
struct mount *mp;
struct vnode *vp;
int error;
/*
* Must be super user
*/
error = suser(td);
if (error)
return (error);
error = copyin(SCARG(uap, u_fhp), &fh, sizeof(fhandle_t));
if (error)
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, td);
vput(vp);
if (error)
return (error);
error = copyout(&sb, SCARG(uap, sb), sizeof(sb));
return (error);
}
/*
* fhstatfs_args(struct fhandle *u_fhp, struct statfs *buf)
*/
int
fhstatfs(struct fhstatfs_args *uap)
{
struct thread *td = curthread;
struct statfs *sp;
struct mount *mp;
struct vnode *vp;
struct statfs sb;
fhandle_t fh;
int error;
/*
* Must be super user
*/
if ((error = suser(td)))
return (error);
if ((error = copyin(SCARG(uap, u_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;
sp = &mp->mnt_stat;
vput(vp);
if ((error = VFS_STATFS(mp, sp, td)) != 0)
return (error);
sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK;
if (suser(td)) {
bcopy((caddr_t)sp, (caddr_t)&sb, sizeof(sb));
sb.f_fsid.val[0] = sb.f_fsid.val[1] = 0;
sp = &sb;
}
return (copyout(sp, SCARG(uap, buf), sizeof(*sp)));
}
/*
* Syscall to push extended attribute configuration information into the
* VFS. Accepts a path, which it converts to a mountpoint, as well as
* a command (int cmd), and attribute name and misc data. For now, the
* attribute name is left in userspace for consumption by the VFS_op.
* It will probably be changed to be copied into sysspace by the
* syscall in the future, once issues with various consumers of the
* attribute code have raised their hands.
*
* Currently this is used only by UFS Extended Attributes.
*/
int
extattrctl(struct extattrctl_args *uap)
{
struct thread *td = curthread;
struct nameidata nd;
struct mount *mp;
int error;
NDINIT(&nd, NAMEI_LOOKUP, CNP_FOLLOW, UIO_USERSPACE, SCARG(uap, path), td);
if ((error = namei(&nd)) != 0)
return (error);
mp = nd.ni_vp->v_mount;
NDFREE(&nd, 0);
return (VFS_EXTATTRCTL(mp, SCARG(uap, cmd), SCARG(uap, attrname),
SCARG(uap, arg), td));
}
/*
* Syscall to set a named extended attribute on a file or directory.
* Accepts attribute name, and a uio structure pointing to the data to set.
* The uio is consumed in the style of writev(). The real work happens
* in VOP_SETEXTATTR().
*/
int
extattr_set_file(struct extattr_set_file_args *uap)
{
struct thread *td = curthread;
struct proc *p = td->td_proc;
struct nameidata nd;
struct uio auio;
struct iovec *iov, *needfree = NULL, aiov[UIO_SMALLIOV];
char attrname[EXTATTR_MAXNAMELEN];
u_int iovlen, cnt;
int error, i;
error = copyin(SCARG(uap, attrname), attrname, EXTATTR_MAXNAMELEN);
if (error)
return (error);
NDINIT(&nd, NAMEI_LOOKUP, CNP_FOLLOW | CNP_LOCKLEAF, UIO_USERSPACE,
SCARG(uap, path), td);
if ((error = namei(&nd)) != 0)
return(error);
iovlen = uap->iovcnt * sizeof(struct iovec);
if (uap->iovcnt > UIO_SMALLIOV) {
if (uap->iovcnt > UIO_MAXIOV) {
error = EINVAL;
goto done;
}
MALLOC(iov, struct iovec *, iovlen, M_IOV, M_WAITOK);
needfree = iov;
} else
iov = aiov;
auio.uio_iov = iov;
auio.uio_iovcnt = uap->iovcnt;
auio.uio_rw = UIO_WRITE;
auio.uio_segflg = UIO_USERSPACE;
auio.uio_td = td;
auio.uio_offset = 0;
if ((error = copyin((caddr_t)uap->iovp, (caddr_t)iov, iovlen)))
goto done;
auio.uio_resid = 0;
for (i = 0; i < uap->iovcnt; i++) {
if (iov->iov_len > INT_MAX - auio.uio_resid) {
error = EINVAL;
goto done;
}
auio.uio_resid += iov->iov_len;
iov++;
}
cnt = auio.uio_resid;
error = VOP_SETEXTATTR(nd.ni_vp, attrname, &auio, p->p_ucred, td);
cnt -= auio.uio_resid;
uap->sysmsg_result = cnt;
done:
if (needfree)
FREE(needfree, M_IOV);
NDFREE(&nd, 0);
return (error);
}
/*
* Syscall to get a named extended attribute on a file or directory.
* Accepts attribute name, and a uio structure pointing to a buffer for the
* data. The uio is consumed in the style of readv(). The real work
* happens in VOP_GETEXTATTR();
*/
int
extattr_get_file(struct extattr_get_file_args *uap)
{
struct thread *td = curthread;
struct proc *p = td->td_proc;
struct nameidata nd;
struct uio auio;
struct iovec *iov, *needfree, aiov[UIO_SMALLIOV];
char attrname[EXTATTR_MAXNAMELEN];
u_int iovlen, cnt;
int error, i;
error = copyin(SCARG(uap, attrname), attrname, EXTATTR_MAXNAMELEN);
if (error)
return (error);
NDINIT(&nd, NAMEI_LOOKUP, CNP_FOLLOW | CNP_LOCKLEAF, UIO_USERSPACE,
SCARG(uap, path), td);
if ((error = namei(&nd)) != 0)
return (error);
iovlen = uap->iovcnt * sizeof (struct iovec);
if (uap->iovcnt > UIO_SMALLIOV) {
if (uap->iovcnt > UIO_MAXIOV) {
NDFREE(&nd, 0);
return (EINVAL);
}
MALLOC(iov, struct iovec *, iovlen, M_IOV, M_WAITOK);
needfree = iov;
} else {
iov = aiov;
needfree = NULL;
}
auio.uio_iov = iov;
auio.uio_iovcnt = uap->iovcnt;
auio.uio_rw = UIO_READ;
auio.uio_segflg = UIO_USERSPACE;
auio.uio_td = td;
auio.uio_offset = 0;
if ((error = copyin((caddr_t)uap->iovp, (caddr_t)iov, iovlen)))
goto done;
auio.uio_resid = 0;
for (i = 0; i < uap->iovcnt; i++) {
if (iov->iov_len > INT_MAX - auio.uio_resid) {
error = EINVAL;
goto done;
}
auio.uio_resid += iov->iov_len;
iov++;
}
cnt = auio.uio_resid;
error = VOP_GETEXTATTR(nd.ni_vp, attrname, &auio, p->p_ucred, td);
cnt -= auio.uio_resid;
uap->sysmsg_result = cnt;
done:
if (needfree)
FREE(needfree, M_IOV);
NDFREE(&nd, 0);
return(error);
}
/*
* Syscall to delete a named extended attribute from a file or directory.
* Accepts attribute name. The real work happens in VOP_SETEXTATTR().
*/
int
extattr_delete_file(struct extattr_delete_file_args *uap)
{
struct thread *td = curthread;
struct proc *p = td->td_proc;
struct nameidata nd;
char attrname[EXTATTR_MAXNAMELEN];
int error;
error = copyin(SCARG(uap, attrname), attrname, EXTATTR_MAXNAMELEN);
if (error)
return(error);
NDINIT(&nd, NAMEI_LOOKUP, CNP_FOLLOW | CNP_LOCKLEAF, UIO_USERSPACE,
SCARG(uap, path), td);
if ((error = namei(&nd)) != 0)
return(error);
error = VOP_SETEXTATTR(nd.ni_vp, attrname, NULL, p->p_ucred, td);
NDFREE(&nd, 0);
return(error);
}
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