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freebsd-skq/sys/kern/vfs_syscalls.c
David Malone 31c7e8b05b Nudge Giant as far as I can into kern_open(). Mark open() as MPSAFE. 
Use kern_open() to implement creat() rather than taking the long route
through open(). Mark creat as MPSAFE.

While I'm at it, mark nosys() (syscall 0) as MPSAFE, for all the
difference it will make.
2004-03-16 10:46:42 +00:00

4857 lines
101 KiB
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/*
* Copyright (c) 1989, 1993
* The Regents of the University of California. All rights reserved.
* (c) UNIX System Laboratories, Inc.
* All or some portions of this file are derived from material licensed
* to the University of California by American Telephone and Telegraph
* Co. or Unix System Laboratories, Inc. and are reproduced herein with
* the permission of UNIX System Laboratories, Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)vfs_syscalls.c 8.13 (Berkeley) 4/15/94
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
/* For 4.3 integer FS ID compatibility */
#include "opt_compat.h"
#include "opt_mac.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/bio.h>
#include <sys/buf.h>
#include <sys/sysent.h>
#include <sys/mac.h>
#include <sys/malloc.h>
#include <sys/mount.h>
#include <sys/mutex.h>
#include <sys/sysproto.h>
#include <sys/namei.h>
#include <sys/filedesc.h>
#include <sys/kernel.h>
#include <sys/fcntl.h>
#include <sys/file.h>
#include <sys/limits.h>
#include <sys/linker.h>
#include <sys/stat.h>
#include <sys/sx.h>
#include <sys/unistd.h>
#include <sys/vnode.h>
#include <sys/proc.h>
#include <sys/dirent.h>
#include <sys/extattr.h>
#include <sys/jail.h>
#include <sys/syscallsubr.h>
#include <sys/sysctl.h>
#include <machine/stdarg.h>
#include <vm/vm.h>
#include <vm/vm_object.h>
#include <vm/vm_page.h>
#include <vm/uma.h>
static int chroot_refuse_vdir_fds(struct filedesc *fdp);
static int getutimes(const struct timeval *, enum uio_seg, struct timespec *);
static int setfown(struct thread *td, struct vnode *, uid_t, gid_t);
static int setfmode(struct thread *td, struct vnode *, int);
static int setfflags(struct thread *td, struct vnode *, int);
static int setutimes(struct thread *td, struct vnode *,
const struct timespec *, int, int);
static int vn_access(struct vnode *vp, int user_flags, struct ucred *cred,
struct thread *td);
static int extattr_list_vp(struct vnode *vp, int attrnamespace, void *data,
size_t nbytes, struct thread *td);
int (*union_dircheckp)(struct thread *td, struct vnode **, struct file *);
int (*softdep_fsync_hook)(struct vnode *);
/*
* The module initialization routine for POSIX asynchronous I/O will
* set this to the version of AIO that it implements. (Zero means
* that it is not implemented.) This value is used here by pathconf()
* and in kern_descrip.c by fpathconf().
*/
int async_io_version;
/*
* Sync each mounted filesystem.
*/
#ifndef _SYS_SYSPROTO_H_
struct sync_args {
int dummy;
};
#endif
#ifdef DEBUG
static int syncprt = 0;
SYSCTL_INT(_debug, OID_AUTO, syncprt, CTLFLAG_RW, &syncprt, 0, "");
#endif
/* ARGSUSED */
int
sync(td, uap)
struct thread *td;
struct sync_args *uap;
{
struct mount *mp, *nmp;
int asyncflag;
mtx_lock(&mountlist_mtx);
for (mp = TAILQ_FIRST(&mountlist); mp != NULL; mp = nmp) {
if (vfs_busy(mp, LK_NOWAIT, &mountlist_mtx, td)) {
nmp = TAILQ_NEXT(mp, mnt_list);
continue;
}
if ((mp->mnt_flag & MNT_RDONLY) == 0 &&
vn_start_write(NULL, &mp, V_NOWAIT) == 0) {
asyncflag = mp->mnt_flag & MNT_ASYNC;
mp->mnt_flag &= ~MNT_ASYNC;
vfs_msync(mp, MNT_NOWAIT);
VFS_SYNC(mp, MNT_NOWAIT,
((td != NULL) ? td->td_ucred : NOCRED), td);
mp->mnt_flag |= asyncflag;
vn_finished_write(mp);
}
mtx_lock(&mountlist_mtx);
nmp = TAILQ_NEXT(mp, mnt_list);
vfs_unbusy(mp, td);
}
mtx_unlock(&mountlist_mtx);
#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
/*
* Change filesystem quotas.
*/
#ifndef _SYS_SYSPROTO_H_
struct quotactl_args {
char *path;
int cmd;
int uid;
caddr_t arg;
};
#endif
/* ARGSUSED */
int
quotactl(td, uap)
struct thread *td;
register struct quotactl_args /* {
char *path;
int cmd;
int uid;
caddr_t arg;
} */ *uap;
{
struct mount *mp;
int error;
struct nameidata nd;
if (jailed(td->td_ucred) && !prison_quotas)
return (EPERM);
NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, uap->path, td);
if ((error = namei(&nd)) != 0)
return (error);
NDFREE(&nd, NDF_ONLY_PNBUF);
error = vn_start_write(nd.ni_vp, &mp, V_WAIT | PCATCH);
vrele(nd.ni_vp);
if (error)
return (error);
error = VFS_QUOTACTL(mp, uap->cmd, uap->uid, uap->arg, td);
vn_finished_write(mp);
return (error);
}
/*
* Get filesystem statistics.
*/
#ifndef _SYS_SYSPROTO_H_
struct statfs_args {
char *path;
struct statfs *buf;
};
#endif
/* ARGSUSED */
int
statfs(td, uap)
struct thread *td;
register struct statfs_args /* {
char *path;
struct statfs *buf;
} */ *uap;
{
struct mount *mp;
struct statfs *sp, sb;
int error;
struct nameidata nd;
NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, uap->path, td);
if ((error = namei(&nd)) != 0)
return (error);
mp = nd.ni_vp->v_mount;
sp = &mp->mnt_stat;
NDFREE(&nd, NDF_ONLY_PNBUF);
vrele(nd.ni_vp);
#ifdef MAC
error = mac_check_mount_stat(td->td_ucred, mp);
if (error)
return (error);
#endif
/*
* Set these in case the underlying filesystem fails to do so.
*/
sp->f_version = STATFS_VERSION;
sp->f_namemax = NAME_MAX;
sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK;
error = VFS_STATFS(mp, sp, td);
if (error)
return (error);
if (suser(td)) {
bcopy(sp, &sb, sizeof(sb));
sb.f_fsid.val[0] = sb.f_fsid.val[1] = 0;
sp = &sb;
}
return (copyout(sp, uap->buf, sizeof(*sp)));
}
/*
* Get filesystem statistics.
*/
#ifndef _SYS_SYSPROTO_H_
struct fstatfs_args {
int fd;
struct statfs *buf;
};
#endif
/* ARGSUSED */
int
fstatfs(td, uap)
struct thread *td;
register struct fstatfs_args /* {
int fd;
struct statfs *buf;
} */ *uap;
{
struct file *fp;
struct mount *mp;
struct statfs *sp, sb;
int error;
if ((error = getvnode(td->td_proc->p_fd, uap->fd, &fp)) != 0)
return (error);
mp = fp->f_vnode->v_mount;
fdrop(fp, td);
if (mp == NULL)
return (EBADF);
#ifdef MAC
error = mac_check_mount_stat(td->td_ucred, mp);
if (error)
return (error);
#endif
sp = &mp->mnt_stat;
/*
* Set these in case the underlying filesystem fails to do so.
*/
sp->f_version = STATFS_VERSION;
sp->f_namemax = NAME_MAX;
sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK;
error = VFS_STATFS(mp, sp, td);
if (error)
return (error);
if (suser(td)) {
bcopy(sp, &sb, sizeof(sb));
sb.f_fsid.val[0] = sb.f_fsid.val[1] = 0;
sp = &sb;
}
return (copyout(sp, uap->buf, sizeof(*sp)));
}
/*
* Get statistics on all filesystems.
*/
#ifndef _SYS_SYSPROTO_H_
struct getfsstat_args {
struct statfs *buf;
long bufsize;
int flags;
};
#endif
int
getfsstat(td, uap)
struct thread *td;
register struct getfsstat_args /* {
struct statfs *buf;
long bufsize;
int flags;
} */ *uap;
{
struct mount *mp, *nmp;
struct statfs *sp, sb;
caddr_t sfsp;
long count, maxcount, error;
maxcount = uap->bufsize / sizeof(struct statfs);
sfsp = (caddr_t)uap->buf;
count = 0;
mtx_lock(&mountlist_mtx);
for (mp = TAILQ_FIRST(&mountlist); mp != NULL; mp = nmp) {
if (!prison_check_mount(td->td_ucred, mp)) {
nmp = TAILQ_NEXT(mp, mnt_list);
continue;
}
#ifdef MAC
if (mac_check_mount_stat(td->td_ucred, mp) != 0) {
nmp = TAILQ_NEXT(mp, mnt_list);
continue;
}
#endif
if (vfs_busy(mp, LK_NOWAIT, &mountlist_mtx, td)) {
nmp = TAILQ_NEXT(mp, mnt_list);
continue;
}
if (sfsp && count < maxcount) {
sp = &mp->mnt_stat;
/*
* Set these in case the underlying filesystem
* fails to do so.
*/
sp->f_version = STATFS_VERSION;
sp->f_namemax = NAME_MAX;
sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK;
/*
* If MNT_NOWAIT or MNT_LAZY is specified, do not
* refresh the fsstat cache. MNT_NOWAIT or MNT_LAZY
* overrides MNT_WAIT.
*/
if (((uap->flags & (MNT_LAZY|MNT_NOWAIT)) == 0 ||
(uap->flags & MNT_WAIT)) &&
(error = VFS_STATFS(mp, sp, td))) {
mtx_lock(&mountlist_mtx);
nmp = TAILQ_NEXT(mp, mnt_list);
vfs_unbusy(mp, td);
continue;
}
if (suser(td)) {
bcopy(sp, &sb, sizeof(sb));
sb.f_fsid.val[0] = sb.f_fsid.val[1] = 0;
sp = &sb;
}
error = copyout(sp, sfsp, sizeof(*sp));
if (error) {
vfs_unbusy(mp, td);
return (error);
}
sfsp += sizeof(*sp);
}
count++;
mtx_lock(&mountlist_mtx);
nmp = TAILQ_NEXT(mp, mnt_list);
vfs_unbusy(mp, td);
}
mtx_unlock(&mountlist_mtx);
if (sfsp && count > maxcount)
td->td_retval[0] = maxcount;
else
td->td_retval[0] = count;
return (0);
}
#ifdef COMPAT_FREEBSD4
/*
* Get old format filesystem statistics.
*/
static void cvtstatfs(struct thread *, struct statfs *, struct ostatfs *);
#ifndef _SYS_SYSPROTO_H_
struct freebsd4_statfs_args {
char *path;
struct ostatfs *buf;
};
#endif
/* ARGSUSED */
int
freebsd4_statfs(td, uap)
struct thread *td;
struct freebsd4_statfs_args /* {
char *path;
struct ostatfs *buf;
} */ *uap;
{
struct mount *mp;
struct statfs *sp;
struct ostatfs osb;
int error;
struct nameidata nd;
NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, uap->path, td);
if ((error = namei(&nd)) != 0)
return (error);
mp = nd.ni_vp->v_mount;
sp = &mp->mnt_stat;
NDFREE(&nd, NDF_ONLY_PNBUF);
vrele(nd.ni_vp);
#ifdef MAC
error = mac_check_mount_stat(td->td_ucred, mp);
if (error)
return (error);
#endif
error = VFS_STATFS(mp, sp, td);
if (error)
return (error);
sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK;
cvtstatfs(td, sp, &osb);
return (copyout(&osb, uap->buf, sizeof(osb)));
}
/*
* Get filesystem statistics.
*/
#ifndef _SYS_SYSPROTO_H_
struct freebsd4_fstatfs_args {
int fd;
struct ostatfs *buf;
};
#endif
/* ARGSUSED */
int
freebsd4_fstatfs(td, uap)
struct thread *td;
struct freebsd4_fstatfs_args /* {
int fd;
struct ostatfs *buf;
} */ *uap;
{
struct file *fp;
struct mount *mp;
struct statfs *sp;
struct ostatfs osb;
int error;
if ((error = getvnode(td->td_proc->p_fd, uap->fd, &fp)) != 0)
return (error);
mp = fp->f_vnode->v_mount;
fdrop(fp, td);
if (mp == NULL)
return (EBADF);
#ifdef MAC
error = mac_check_mount_stat(td->td_ucred, mp);
if (error)
return (error);
#endif
sp = &mp->mnt_stat;
error = VFS_STATFS(mp, sp, td);
if (error)
return (error);
sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK;
cvtstatfs(td, sp, &osb);
return (copyout(&osb, uap->buf, sizeof(osb)));
}
/*
* Get statistics on all filesystems.
*/
#ifndef _SYS_SYSPROTO_H_
struct freebsd4_getfsstat_args {
struct ostatfs *buf;
long bufsize;
int flags;
};
#endif
int
freebsd4_getfsstat(td, uap)
struct thread *td;
register struct freebsd4_getfsstat_args /* {
struct ostatfs *buf;
long bufsize;
int flags;
} */ *uap;
{
struct mount *mp, *nmp;
struct statfs *sp;
struct ostatfs osb;
caddr_t sfsp;
long count, maxcount, error;
maxcount = uap->bufsize / sizeof(struct ostatfs);
sfsp = (caddr_t)uap->buf;
count = 0;
mtx_lock(&mountlist_mtx);
for (mp = TAILQ_FIRST(&mountlist); mp != NULL; mp = nmp) {
if (!prison_check_mount(td->td_ucred, mp)) {
nmp = TAILQ_NEXT(mp, mnt_list);
continue;
}
#ifdef MAC
if (mac_check_mount_stat(td->td_ucred, mp) != 0) {
nmp = TAILQ_NEXT(mp, mnt_list);
continue;
}
#endif
if (vfs_busy(mp, LK_NOWAIT, &mountlist_mtx, 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 (((uap->flags & (MNT_LAZY|MNT_NOWAIT)) == 0 ||
(uap->flags & MNT_WAIT)) &&
(error = VFS_STATFS(mp, sp, td))) {
mtx_lock(&mountlist_mtx);
nmp = TAILQ_NEXT(mp, mnt_list);
vfs_unbusy(mp, td);
continue;
}
sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK;
cvtstatfs(td, sp, &osb);
error = copyout(&osb, sfsp, sizeof(osb));
if (error) {
vfs_unbusy(mp, td);
return (error);
}
sfsp += sizeof(osb);
}
count++;
mtx_lock(&mountlist_mtx);
nmp = TAILQ_NEXT(mp, mnt_list);
vfs_unbusy(mp, td);
}
mtx_unlock(&mountlist_mtx);
if (sfsp && count > maxcount)
td->td_retval[0] = maxcount;
else
td->td_retval[0] = count;
return (0);
}
/*
* Implement fstatfs() for (NFS) file handles.
*/
#ifndef _SYS_SYSPROTO_H_
struct freebsd4_fhstatfs_args {
struct fhandle *u_fhp;
struct ostatfs *buf;
};
#endif
int
freebsd4_fhstatfs(td, uap)
struct thread *td;
struct freebsd4_fhstatfs_args /* {
struct fhandle *u_fhp;
struct ostatfs *buf;
} */ *uap;
{
struct statfs *sp;
struct mount *mp;
struct vnode *vp;
struct ostatfs osb;
fhandle_t fh;
int error;
/*
* Must be super user
*/
error = suser(td);
if (error)
return (error);
if ((error = copyin(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);
#ifdef MAC
error = mac_check_mount_stat(td->td_ucred, mp);
if (error)
return (error);
#endif
if ((error = VFS_STATFS(mp, sp, td)) != 0)
return (error);
sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK;
cvtstatfs(td, sp, &osb);
return (copyout(&osb, uap->buf, sizeof(osb)));
}
/*
* Convert a new format statfs structure to an old format statfs structure.
*/
static void
cvtstatfs(td, nsp, osp)
struct thread *td;
struct statfs *nsp;
struct ostatfs *osp;
{
bzero(osp, sizeof(*osp));
osp->f_bsize = MIN(nsp->f_bsize, LONG_MAX);
osp->f_iosize = MIN(nsp->f_iosize, LONG_MAX);
osp->f_blocks = MIN(nsp->f_blocks, LONG_MAX);
osp->f_bfree = MIN(nsp->f_bfree, LONG_MAX);
osp->f_bavail = MIN(nsp->f_bavail, LONG_MAX);
osp->f_files = MIN(nsp->f_files, LONG_MAX);
osp->f_ffree = MIN(nsp->f_ffree, LONG_MAX);
osp->f_owner = nsp->f_owner;
osp->f_type = nsp->f_type;
osp->f_flags = nsp->f_flags;
osp->f_syncwrites = MIN(nsp->f_syncwrites, LONG_MAX);
osp->f_asyncwrites = MIN(nsp->f_asyncwrites, LONG_MAX);
osp->f_syncreads = MIN(nsp->f_syncreads, LONG_MAX);
osp->f_asyncreads = MIN(nsp->f_asyncreads, LONG_MAX);
bcopy(nsp->f_fstypename, osp->f_fstypename,
MIN(MFSNAMELEN, OMNAMELEN));
bcopy(nsp->f_mntonname, osp->f_mntonname,
MIN(MFSNAMELEN, OMNAMELEN));
bcopy(nsp->f_mntfromname, osp->f_mntfromname,
MIN(MFSNAMELEN, OMNAMELEN));
if (suser(td)) {
osp->f_fsid.val[0] = osp->f_fsid.val[1] = 0;
} else {
osp->f_fsid = nsp->f_fsid;
}
}
#endif /* COMPAT_FREEBSD4 */
/*
* Change current working directory to a given file descriptor.
*/
#ifndef _SYS_SYSPROTO_H_
struct fchdir_args {
int fd;
};
#endif
/* ARGSUSED */
int
fchdir(td, uap)
struct thread *td;
struct fchdir_args /* {
int fd;
} */ *uap;
{
register struct filedesc *fdp = td->td_proc->p_fd;
struct vnode *vp, *tdp, *vpold;
struct mount *mp;
struct file *fp;
int error;
if ((error = getvnode(fdp, uap->fd, &fp)) != 0)
return (error);
vp = fp->f_vnode;
VREF(vp);
fdrop(fp, td);
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
if (vp->v_type != VDIR)
error = ENOTDIR;
#ifdef MAC
else if ((error = mac_check_vnode_chdir(td->td_ucred, vp)) != 0) {
}
#endif
else
error = VOP_ACCESS(vp, VEXEC, td->td_ucred, td);
while (!error && (mp = vp->v_mountedhere) != NULL) {
if (vfs_busy(mp, 0, 0, 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, 0, td);
FILEDESC_LOCK(fdp);
vpold = fdp->fd_cdir;
fdp->fd_cdir = vp;
FILEDESC_UNLOCK(fdp);
vrele(vpold);
return (0);
}
/*
* Change current working directory (``.'').
*/
#ifndef _SYS_SYSPROTO_H_
struct chdir_args {
char *path;
};
#endif
/* ARGSUSED */
int
chdir(td, uap)
struct thread *td;
struct chdir_args /* {
char *path;
} */ *uap;
{
return (kern_chdir(td, uap->path, UIO_USERSPACE));
}
int
kern_chdir(struct thread *td, char *path, enum uio_seg pathseg)
{
register struct filedesc *fdp = td->td_proc->p_fd;
int error;
struct nameidata nd;
struct vnode *vp;
NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, pathseg, path, td);
if ((error = namei(&nd)) != 0)
return (error);
if ((error = change_dir(nd.ni_vp, td)) != 0) {
vput(nd.ni_vp);
NDFREE(&nd, NDF_ONLY_PNBUF);
return (error);
}
VOP_UNLOCK(nd.ni_vp, 0, td);
NDFREE(&nd, NDF_ONLY_PNBUF);
FILEDESC_LOCK(fdp);
vp = fdp->fd_cdir;
fdp->fd_cdir = nd.ni_vp;
FILEDESC_UNLOCK(fdp);
vrele(vp);
return (0);
}
/*
* 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 fd;
FILEDESC_LOCK_ASSERT(fdp, MA_OWNED);
for (fd = 0; fd < fdp->fd_nfiles ; fd++) {
fp = fget_locked(fdp, fd);
if (fp == NULL)
continue;
if (fp->f_type == DTYPE_VNODE) {
vp = fp->f_vnode;
if (vp->v_type == VDIR)
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, "");
/*
* Change notion of root (``/'') directory.
*/
#ifndef _SYS_SYSPROTO_H_
struct chroot_args {
char *path;
};
#endif
/* ARGSUSED */
int
chroot(td, uap)
struct thread *td;
struct chroot_args /* {
char *path;
} */ *uap;
{
int error;
struct nameidata nd;
error = suser_cred(td->td_ucred, PRISON_ROOT);
if (error)
return (error);
NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, uap->path, td);
mtx_lock(&Giant);
error = namei(&nd);
if (error)
goto error;
if ((error = change_dir(nd.ni_vp, td)) != 0)
goto e_vunlock;
#ifdef MAC
if ((error = mac_check_vnode_chroot(td->td_ucred, nd.ni_vp)))
goto e_vunlock;
#endif
VOP_UNLOCK(nd.ni_vp, 0, td);
error = change_root(nd.ni_vp, td);
vrele(nd.ni_vp);
NDFREE(&nd, NDF_ONLY_PNBUF);
mtx_unlock(&Giant);
return (error);
e_vunlock:
vput(nd.ni_vp);
error:
mtx_unlock(&Giant);
NDFREE(&nd, NDF_ONLY_PNBUF);
return (error);
}
/*
* Common routine for chroot and chdir. Callers must provide a locked vnode
* instance.
*/
int
change_dir(vp, td)
struct vnode *vp;
struct thread *td;
{
int error;
ASSERT_VOP_LOCKED(vp, "change_dir(): vp not locked");
if (vp->v_type != VDIR)
return (ENOTDIR);
#ifdef MAC
error = mac_check_vnode_chdir(td->td_ucred, vp);
if (error)
return (error);
#endif
error = VOP_ACCESS(vp, VEXEC, td->td_ucred, td);
return (error);
}
/*
* Common routine for kern_chroot() and jail_attach(). The caller is
* responsible for invoking suser() and mac_check_chroot() to authorize this
* operation.
*/
int
change_root(vp, td)
struct vnode *vp;
struct thread *td;
{
struct filedesc *fdp;
struct vnode *oldvp;
int error;
mtx_assert(&Giant, MA_OWNED);
fdp = td->td_proc->p_fd;
FILEDESC_LOCK(fdp);
if (chroot_allow_open_directories == 0 ||
(chroot_allow_open_directories == 1 && fdp->fd_rdir != rootvnode)) {
error = chroot_refuse_vdir_fds(fdp);
if (error) {
FILEDESC_UNLOCK(fdp);
return (error);
}
}
oldvp = fdp->fd_rdir;
fdp->fd_rdir = vp;
VREF(fdp->fd_rdir);
if (!fdp->fd_jdir) {
fdp->fd_jdir = vp;
VREF(fdp->fd_jdir);
}
FILEDESC_UNLOCK(fdp);
vrele(oldvp);
return (0);
}
/*
* Check permissions, allocate an open file structure,
* and call the device open routine if any.
*
* MP SAFE
*/
#ifndef _SYS_SYSPROTO_H_
struct open_args {
char *path;
int flags;
int mode;
};
#endif
int
open(td, uap)
struct thread *td;
register struct open_args /* {
char *path;
int flags;
int mode;
} */ *uap;
{
return (kern_open(td, uap->path, UIO_USERSPACE, uap->flags, uap->mode));
}
int
kern_open(struct thread *td, char *path, enum uio_seg pathseg, int flags,
int mode)
{
struct proc *p = td->td_proc;
struct filedesc *fdp = p->p_fd;
struct file *fp;
struct vnode *vp;
struct vattr vat;
struct mount *mp;
int cmode;
struct file *nfp;
int type, indx, error;
struct flock lf;
struct nameidata nd;
if ((flags & O_ACCMODE) == O_ACCMODE)
return (EINVAL);
flags = FFLAGS(flags);
error = falloc(td, &nfp, &indx);
if (error)
return (error);
/* An extra reference on `nfp' has been held for us by falloc(). */
fp = nfp;
cmode = ((mode &~ fdp->fd_cmask) & ALLPERMS) &~ S_ISTXT;
NDINIT(&nd, LOOKUP, FOLLOW, pathseg, path, td);
td->td_dupfd = -1; /* XXX check for fdopen */
mtx_lock(&Giant);
error = vn_open(&nd, &flags, cmode, indx);
if (error) {
mtx_unlock(&Giant);
/*
* If the vn_open replaced the method vector, something
* wonderous happened deep below and we just pass it up
* pretending we know what we do.
*/
if (error == ENXIO && fp->f_ops != &badfileops) {
fdrop(fp, td);
td->td_retval[0] = indx;
return (0);
}
/*
* 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) &&
td->td_dupfd >= 0 && /* XXX from fdopen */
(error =
dupfdopen(td, fdp, indx, td->td_dupfd, flags, error)) == 0) {
td->td_retval[0] = indx;
return (0);
}
/*
* Clean up the descriptor, but only if another thread hadn't
* replaced or closed it.
*/
FILEDESC_LOCK(fdp);
if (fdp->fd_ofiles[indx] == fp) {
fdp->fd_ofiles[indx] = NULL;
fdunused(fdp, indx);
FILEDESC_UNLOCK(fdp);
fdrop(fp, td);
} else {
FILEDESC_UNLOCK(fdp);
}
if (error == ERESTART)
error = EINTR;
return (error);
}
td->td_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.
* We call vn_close() manually because we haven't yet hooked up
* the various 'struct file' fields.
*/
FILEDESC_LOCK(fdp);
FILE_LOCK(fp);
if (fp->f_count == 1) {
KASSERT(fdp->fd_ofiles[indx] != fp,
("Open file descriptor lost all refs"));
FILEDESC_UNLOCK(fdp);
FILE_UNLOCK(fp);
VOP_UNLOCK(vp, 0, td);
vn_close(vp, flags & FMASK, fp->f_cred, td);
mtx_unlock(&Giant);
fdrop(fp, td);
td->td_retval[0] = indx;
return (0);
}
fp->f_vnode = vp;
fp->f_data = vp;
fp->f_flag = flags & FMASK;
fp->f_ops = &vnops;
fp->f_seqcount = 1;
fp->f_type = (vp->v_type == VFIFO ? DTYPE_FIFO : DTYPE_VNODE);
FILEDESC_UNLOCK(fdp);
FILE_UNLOCK(fp);
/* 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, 0, td);
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;
if ((error = VOP_ADVLOCK(vp, (caddr_t)fp, F_SETLK, &lf,
type)) != 0)
goto bad;
fp->f_flag |= FHASLOCK;
}
if (flags & O_TRUNC) {
if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0)
goto bad;
VOP_LEASE(vp, td, td->td_ucred, LEASE_WRITE);
VATTR_NULL(&vat);
vat.va_size = 0;
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
#ifdef MAC
error = mac_check_vnode_write(td->td_ucred, fp->f_cred, vp);
if (error == 0)
#endif
error = VOP_SETATTR(vp, &vat, td->td_ucred, td);
VOP_UNLOCK(vp, 0, td);
vn_finished_write(mp);
if (error)
goto bad;
}
mtx_unlock(&Giant);
/*
* Release our private reference, leaving the one associated with
* the descriptor table intact.
*/
fdrop(fp, td);
td->td_retval[0] = indx;
return (0);
bad:
mtx_unlock(&Giant);
FILEDESC_LOCK(fdp);
if (fdp->fd_ofiles[indx] == fp) {
fdp->fd_ofiles[indx] = NULL;
fdunused(fdp, indx);
FILEDESC_UNLOCK(fdp);
fdrop(fp, td);
} else {
FILEDESC_UNLOCK(fdp);
}
fdrop(fp, td);
return (error);
}
#ifdef COMPAT_43
/*
* Create a file.
*
* MP SAFE
*/
#ifndef _SYS_SYSPROTO_H_
struct ocreat_args {
char *path;
int mode;
};
#endif
int
ocreat(td, uap)
struct thread *td;
register struct ocreat_args /* {
char *path;
int mode;
} */ *uap;
{
return (kern_open(td, uap->path, UIO_USERSPACE,
O_WRONLY | O_CREAT | O_TRUNC, uap->mode));
}
#endif /* COMPAT_43 */
/*
* Create a special file.
*/
#ifndef _SYS_SYSPROTO_H_
struct mknod_args {
char *path;
int mode;
int dev;
};
#endif
/* ARGSUSED */
int
mknod(td, uap)
struct thread *td;
register struct mknod_args /* {
char *path;
int mode;
int dev;
} */ *uap;
{
return (kern_mknod(td, uap->path, UIO_USERSPACE, uap->mode, uap->dev));
}
int
kern_mknod(struct thread *td, char *path, enum uio_seg pathseg, int mode,
int dev)
{
struct vnode *vp;
struct mount *mp;
struct vattr vattr;
int error;
int whiteout = 0;
struct nameidata nd;
switch (mode & S_IFMT) {
case S_IFCHR:
case S_IFBLK:
error = suser(td);
break;
default:
error = suser_cred(td->td_ucred, PRISON_ROOT);
break;
}
if (error)
return (error);
restart:
bwillwrite();
NDINIT(&nd, CREATE, LOCKPARENT | SAVENAME, pathseg, path, td);
if ((error = namei(&nd)) != 0)
return (error);
vp = nd.ni_vp;
if (vp != NULL) {
NDFREE(&nd, NDF_ONLY_PNBUF);
vrele(vp);
if (vp == nd.ni_dvp)
vrele(nd.ni_dvp);
else
vput(nd.ni_dvp);
return (EEXIST);
} else {
VATTR_NULL(&vattr);
FILEDESC_LOCK(td->td_proc->p_fd);
vattr.va_mode = (mode & ALLPERMS) &
~td->td_proc->p_fd->fd_cmask;
FILEDESC_UNLOCK(td->td_proc->p_fd);
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 (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) {
NDFREE(&nd, NDF_ONLY_PNBUF);
vput(nd.ni_dvp);
if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0)
return (error);
goto restart;
}
#ifdef MAC
if (error == 0 && !whiteout)
error = mac_check_vnode_create(td->td_ucred, nd.ni_dvp,
&nd.ni_cnd, &vattr);
#endif
if (!error) {
VOP_LEASE(nd.ni_dvp, td, td->td_ucred, LEASE_WRITE);
if (whiteout)
error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, CREATE);
else {
error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp,
&nd.ni_cnd, &vattr);
if (error == 0)
vput(nd.ni_vp);
}
}
NDFREE(&nd, NDF_ONLY_PNBUF);
vput(nd.ni_dvp);
vn_finished_write(mp);
ASSERT_VOP_UNLOCKED(nd.ni_dvp, "mknod");
ASSERT_VOP_UNLOCKED(nd.ni_vp, "mknod");
return (error);
}
/*
* Create a named pipe.
*/
#ifndef _SYS_SYSPROTO_H_
struct mkfifo_args {
char *path;
int mode;
};
#endif
/* ARGSUSED */
int
mkfifo(td, uap)
struct thread *td;
register struct mkfifo_args /* {
char *path;
int mode;
} */ *uap;
{
return (kern_mkfifo(td, uap->path, UIO_USERSPACE, uap->mode));
}
int
kern_mkfifo(struct thread *td, char *path, enum uio_seg pathseg, int mode)
{
struct mount *mp;
struct vattr vattr;
int error;
struct nameidata nd;
restart:
bwillwrite();
NDINIT(&nd, CREATE, LOCKPARENT | SAVENAME, pathseg, path, td);
if ((error = namei(&nd)) != 0)
return (error);
if (nd.ni_vp != NULL) {
NDFREE(&nd, NDF_ONLY_PNBUF);
vrele(nd.ni_vp);
if (nd.ni_vp == nd.ni_dvp)
vrele(nd.ni_dvp);
else
vput(nd.ni_dvp);
return (EEXIST);
}
if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) {
NDFREE(&nd, NDF_ONLY_PNBUF);
vput(nd.ni_dvp);
if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0)
return (error);
goto restart;
}
VATTR_NULL(&vattr);
vattr.va_type = VFIFO;
FILEDESC_LOCK(td->td_proc->p_fd);
vattr.va_mode = (mode & ALLPERMS) & ~td->td_proc->p_fd->fd_cmask;
FILEDESC_UNLOCK(td->td_proc->p_fd);
#ifdef MAC
error = mac_check_vnode_create(td->td_ucred, nd.ni_dvp, &nd.ni_cnd,
&vattr);
if (error)
goto out;
#endif
VOP_LEASE(nd.ni_dvp, td, td->td_ucred, LEASE_WRITE);
error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr);
if (error == 0)
vput(nd.ni_vp);
#ifdef MAC
out:
#endif
NDFREE(&nd, NDF_ONLY_PNBUF);
vput(nd.ni_dvp);
vn_finished_write(mp);
return (error);
}
/*
* Make a hard file link.
*/
#ifndef _SYS_SYSPROTO_H_
struct link_args {
char *path;
char *link;
};
#endif
/* ARGSUSED */
int
link(td, uap)
struct thread *td;
register struct link_args /* {
char *path;
char *link;
} */ *uap;
{
return (kern_link(td, uap->path, uap->link, UIO_USERSPACE));
}
SYSCTL_DECL(_security_bsd);
static int hardlink_check_uid = 0;
SYSCTL_INT(_security_bsd, OID_AUTO, hardlink_check_uid, CTLFLAG_RW,
&hardlink_check_uid, 0,
"Unprivileged processes cannot create hard links to files owned by other "
"users");
static int hardlink_check_gid = 0;
SYSCTL_INT(_security_bsd, OID_AUTO, hardlink_check_gid, CTLFLAG_RW,
&hardlink_check_gid, 0,
"Unprivileged processes cannot create hard links to files owned by other "
"groups");
static int
can_hardlink(struct vnode *vp, struct thread *td, struct ucred *cred)
{
struct vattr va;
int error;
if (suser_cred(cred, PRISON_ROOT) == 0)
return (0);
if (!hardlink_check_uid && !hardlink_check_gid)
return (0);
error = VOP_GETATTR(vp, &va, cred, td);
if (error != 0)
return (error);
if (hardlink_check_uid) {
if (cred->cr_uid != va.va_uid)
return (EPERM);
}
if (hardlink_check_gid) {
if (!groupmember(va.va_gid, cred))
return (EPERM);
}
return (0);
}
int
kern_link(struct thread *td, char *path, char *link, enum uio_seg segflg)
{
struct vnode *vp;
struct mount *mp;
struct nameidata nd;
int error;
bwillwrite();
NDINIT(&nd, LOOKUP, FOLLOW|NOOBJ, segflg, path, td);
if ((error = namei(&nd)) != 0)
return (error);
NDFREE(&nd, NDF_ONLY_PNBUF);
vp = nd.ni_vp;
if (vp->v_type == VDIR) {
vrele(vp);
return (EPERM); /* POSIX */
}
if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) {
vrele(vp);
return (error);
}
NDINIT(&nd, CREATE, LOCKPARENT | NOOBJ | SAVENAME, segflg, link, td);
if ((error = namei(&nd)) == 0) {
if (nd.ni_vp != NULL) {
vrele(nd.ni_vp);
if (nd.ni_dvp == nd.ni_vp)
vrele(nd.ni_dvp);
else
vput(nd.ni_dvp);
error = EEXIST;
} else if ((error = vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td))
== 0) {
VOP_LEASE(nd.ni_dvp, td, td->td_ucred, LEASE_WRITE);
VOP_LEASE(vp, td, td->td_ucred, LEASE_WRITE);
error = can_hardlink(vp, td, td->td_ucred);
if (error == 0)
#ifdef MAC
error = mac_check_vnode_link(td->td_ucred,
nd.ni_dvp, vp, &nd.ni_cnd);
if (error == 0)
#endif
error = VOP_LINK(nd.ni_dvp, vp, &nd.ni_cnd);
VOP_UNLOCK(vp, 0, td);
vput(nd.ni_dvp);
}
NDFREE(&nd, NDF_ONLY_PNBUF);
}
vrele(vp);
vn_finished_write(mp);
ASSERT_VOP_UNLOCKED(nd.ni_dvp, "link");
ASSERT_VOP_UNLOCKED(nd.ni_vp, "link");
return (error);
}
/*
* Make a symbolic link.
*/
#ifndef _SYS_SYSPROTO_H_
struct symlink_args {
char *path;
char *link;
};
#endif
/* ARGSUSED */
int
symlink(td, uap)
struct thread *td;
register struct symlink_args /* {
char *path;
char *link;
} */ *uap;
{
return (kern_symlink(td, uap->path, uap->link, UIO_USERSPACE));
}
int
kern_symlink(struct thread *td, char *path, char *link, enum uio_seg segflg)
{
struct mount *mp;
struct vattr vattr;
char *syspath;
int error;
struct nameidata nd;
if (segflg == UIO_SYSSPACE) {
syspath = path;
} else {
syspath = uma_zalloc(namei_zone, M_WAITOK);
if ((error = copyinstr(path, syspath, MAXPATHLEN, NULL)) != 0)
goto out;
}
restart:
bwillwrite();
NDINIT(&nd, CREATE, LOCKPARENT | NOOBJ | SAVENAME, segflg, link, td);
if ((error = namei(&nd)) != 0)
goto out;
if (nd.ni_vp) {
NDFREE(&nd, NDF_ONLY_PNBUF);
vrele(nd.ni_vp);
if (nd.ni_vp == nd.ni_dvp)
vrele(nd.ni_dvp);
else
vput(nd.ni_dvp);
error = EEXIST;
goto out;
}
if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) {
NDFREE(&nd, NDF_ONLY_PNBUF);
vput(nd.ni_dvp);
if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0)
return (error);
goto restart;
}
VATTR_NULL(&vattr);
FILEDESC_LOCK(td->td_proc->p_fd);
vattr.va_mode = ACCESSPERMS &~ td->td_proc->p_fd->fd_cmask;
FILEDESC_UNLOCK(td->td_proc->p_fd);
#ifdef MAC
vattr.va_type = VLNK;
error = mac_check_vnode_create(td->td_ucred, nd.ni_dvp, &nd.ni_cnd,
&vattr);
if (error)
goto out2;
#endif
VOP_LEASE(nd.ni_dvp, td, td->td_ucred, LEASE_WRITE);
error = VOP_SYMLINK(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr, syspath);
if (error == 0)
vput(nd.ni_vp);
#ifdef MAC
out2:
#endif
NDFREE(&nd, NDF_ONLY_PNBUF);
vput(nd.ni_dvp);
vn_finished_write(mp);
ASSERT_VOP_UNLOCKED(nd.ni_dvp, "symlink");
ASSERT_VOP_UNLOCKED(nd.ni_vp, "symlink");
out:
if (segflg != UIO_SYSSPACE)
uma_zfree(namei_zone, syspath);
return (error);
}
/*
* Delete a whiteout from the filesystem.
*/
/* ARGSUSED */
int
undelete(td, uap)
struct thread *td;
register struct undelete_args /* {
char *path;
} */ *uap;
{
int error;
struct mount *mp;
struct nameidata nd;
restart:
bwillwrite();
NDINIT(&nd, DELETE, LOCKPARENT|DOWHITEOUT, UIO_USERSPACE,
uap->path, td);
error = namei(&nd);
if (error)
return (error);
if (nd.ni_vp != NULLVP || !(nd.ni_cnd.cn_flags & ISWHITEOUT)) {
NDFREE(&nd, NDF_ONLY_PNBUF);
if (nd.ni_vp)
vrele(nd.ni_vp);
if (nd.ni_vp == nd.ni_dvp)
vrele(nd.ni_dvp);
else
vput(nd.ni_dvp);
return (EEXIST);
}
if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) {
NDFREE(&nd, NDF_ONLY_PNBUF);
vput(nd.ni_dvp);
if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0)
return (error);
goto restart;
}
VOP_LEASE(nd.ni_dvp, td, td->td_ucred, LEASE_WRITE);
error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, DELETE);
NDFREE(&nd, NDF_ONLY_PNBUF);
vput(nd.ni_dvp);
vn_finished_write(mp);
ASSERT_VOP_UNLOCKED(nd.ni_dvp, "undelete");
ASSERT_VOP_UNLOCKED(nd.ni_vp, "undelete");
return (error);
}
/*
* Delete a name from the filesystem.
*/
#ifndef _SYS_SYSPROTO_H_
struct unlink_args {
char *path;
};
#endif
/* ARGSUSED */
int
unlink(td, uap)
struct thread *td;
struct unlink_args /* {
char *path;
} */ *uap;
{
return (kern_unlink(td, uap->path, UIO_USERSPACE));
}
int
kern_unlink(struct thread *td, char *path, enum uio_seg pathseg)
{
struct mount *mp;
struct vnode *vp;
int error;
struct nameidata nd;
restart:
bwillwrite();
NDINIT(&nd, DELETE, LOCKPARENT|LOCKLEAF, pathseg, path, td);
if ((error = namei(&nd)) != 0)
return (error);
vp = nd.ni_vp;
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_vflag & VV_ROOT)
error = EBUSY;
}
if (error == 0) {
if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) {
NDFREE(&nd, NDF_ONLY_PNBUF);
if (vp == nd.ni_dvp)
vrele(vp);
else
vput(vp);
vput(nd.ni_dvp);
if ((error = vn_start_write(NULL, &mp,
V_XSLEEP | PCATCH)) != 0)
return (error);
goto restart;
}
#ifdef MAC
error = mac_check_vnode_delete(td->td_ucred, nd.ni_dvp, vp,
&nd.ni_cnd);
if (error)
goto out;
#endif
VOP_LEASE(nd.ni_dvp, td, td->td_ucred, LEASE_WRITE);
error = VOP_REMOVE(nd.ni_dvp, vp, &nd.ni_cnd);
#ifdef MAC
out:
#endif
vn_finished_write(mp);
}
NDFREE(&nd, NDF_ONLY_PNBUF);
if (vp == nd.ni_dvp)
vrele(vp);
else
vput(vp);
vput(nd.ni_dvp);
ASSERT_VOP_UNLOCKED(nd.ni_dvp, "unlink");
ASSERT_VOP_UNLOCKED(nd.ni_vp, "unlink");
return (error);
}
/*
* Reposition read/write file offset.
*/
#ifndef _SYS_SYSPROTO_H_
struct lseek_args {
int fd;
int pad;
off_t offset;
int whence;
};
#endif
int
lseek(td, uap)
struct thread *td;
register struct lseek_args /* {
int fd;
int pad;
off_t offset;
int whence;
} */ *uap;
{
struct ucred *cred = td->td_ucred;
struct file *fp;
struct vnode *vp;
struct vattr vattr;
off_t offset;
int error, noneg;
if ((error = fget(td, uap->fd, &fp)) != 0)
return (error);
if (!(fp->f_ops->fo_flags & DFLAG_SEEKABLE)) {
fdrop(fp, td);
return (ESPIPE);
}
vp = fp->f_vnode;
noneg = (vp->v_type != VCHR);
offset = uap->offset;
switch (uap->whence) {
case L_INCR:
if (noneg &&
(fp->f_offset < 0 ||
(offset > 0 && fp->f_offset > OFF_MAX - offset))) {
error = EOVERFLOW;
break;
}
offset += fp->f_offset;
break;
case L_XTND:
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
error = VOP_GETATTR(vp, &vattr, cred, td);
VOP_UNLOCK(vp, 0, td);
if (error)
break;
if (noneg &&
(vattr.va_size > OFF_MAX ||
(offset > 0 && vattr.va_size > OFF_MAX - offset))) {
error = EOVERFLOW;
break;
}
offset += vattr.va_size;
break;
case L_SET:
break;
default:
error = EINVAL;
}
if (error == 0 && noneg && offset < 0)
error = EINVAL;
if (error != 0) {
fdrop(fp, td);
return (error);
}
fp->f_offset = offset;
*(off_t *)(td->td_retval) = fp->f_offset;
fdrop(fp, td);
return (0);
}
#if defined(COMPAT_43) || defined(COMPAT_SUNOS)
/*
* Reposition read/write file offset.
*/
#ifndef _SYS_SYSPROTO_H_
struct olseek_args {
int fd;
long offset;
int whence;
};
#endif
int
olseek(td, uap)
struct thread *td;
register struct olseek_args /* {
int fd;
long offset;
int whence;
} */ *uap;
{
struct lseek_args /* {
int fd;
int pad;
off_t offset;
int whence;
} */ nuap;
int error;
nuap.fd = uap->fd;
nuap.offset = uap->offset;
nuap.whence = uap->whence;
error = lseek(td, &nuap);
return (error);
}
#endif /* COMPAT_43 */
/*
* Check access permissions using passed credentials.
*/
static int
vn_access(vp, user_flags, cred, td)
struct vnode *vp;
int user_flags;
struct ucred *cred;
struct thread *td;
{
int error, flags;
/* Flags == 0 means only check for existence. */
error = 0;
if (user_flags) {
flags = 0;
if (user_flags & R_OK)
flags |= VREAD;
if (user_flags & W_OK)
flags |= VWRITE;
if (user_flags & X_OK)
flags |= VEXEC;
#ifdef MAC
error = mac_check_vnode_access(cred, vp, flags);
if (error)
return (error);
#endif
if ((flags & VWRITE) == 0 || (error = vn_writechk(vp)) == 0)
error = VOP_ACCESS(vp, flags, cred, td);
}
return (error);
}
/*
* Check access permissions using "real" credentials.
*/
#ifndef _SYS_SYSPROTO_H_
struct access_args {
char *path;
int flags;
};
#endif
int
access(td, uap)
struct thread *td;
register struct access_args /* {
char *path;
int flags;
} */ *uap;
{
return (kern_access(td, uap->path, UIO_USERSPACE, uap->flags));
}
int
kern_access(struct thread *td, char *path, enum uio_seg pathseg, int flags)
{
struct ucred *cred, *tmpcred;
register struct vnode *vp;
int error;
struct nameidata nd;
/*
* 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.
*
* XXX - Depending on how "threads" are finally implemented, it
* may be better to explicitly pass the credential to namei()
* rather than to modify the potentially shared process structure.
*/
cred = td->td_ucred;
tmpcred = crdup(cred);
tmpcred->cr_uid = cred->cr_ruid;
tmpcred->cr_groups[0] = cred->cr_rgid;
td->td_ucred = tmpcred;
NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | NOOBJ, pathseg, path, td);
if ((error = namei(&nd)) != 0)
goto out1;
vp = nd.ni_vp;
error = vn_access(vp, flags, tmpcred, td);
NDFREE(&nd, NDF_ONLY_PNBUF);
vput(vp);
out1:
td->td_ucred = cred;
crfree(tmpcred);
return (error);
}
/*
* Check access permissions using "effective" credentials.
*/
#ifndef _SYS_SYSPROTO_H_
struct eaccess_args {
char *path;
int flags;
};
#endif
int
eaccess(td, uap)
struct thread *td;
register struct eaccess_args /* {
char *path;
int flags;
} */ *uap;
{
struct nameidata nd;
struct vnode *vp;
int error;
NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | NOOBJ, UIO_USERSPACE,
uap->path, td);
if ((error = namei(&nd)) != 0)
return (error);
vp = nd.ni_vp;
error = vn_access(vp, uap->flags, td->td_ucred, td);
NDFREE(&nd, NDF_ONLY_PNBUF);
vput(vp);
return (error);
}
#if defined(COMPAT_43) || defined(COMPAT_SUNOS)
/*
* Get file status; this version follows links.
*/
#ifndef _SYS_SYSPROTO_H_
struct ostat_args {
char *path;
struct ostat *ub;
};
#endif
/* ARGSUSED */
int
ostat(td, uap)
struct thread *td;
register struct ostat_args /* {
char *path;
struct ostat *ub;
} */ *uap;
{
struct stat sb;
struct ostat osb;
int error;
struct nameidata nd;
NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | NOOBJ, UIO_USERSPACE,
uap->path, td);
if ((error = namei(&nd)) != 0)
return (error);
NDFREE(&nd, NDF_ONLY_PNBUF);
error = vn_stat(nd.ni_vp, &sb, td->td_ucred, NOCRED, td);
vput(nd.ni_vp);
if (error)
return (error);
cvtstat(&sb, &osb);
error = copyout(&osb, uap->ub, sizeof (osb));
return (error);
}
/*
* Get file status; this version does not follow links.
*/
#ifndef _SYS_SYSPROTO_H_
struct olstat_args {
char *path;
struct ostat *ub;
};
#endif
/* ARGSUSED */
int
olstat(td, uap)
struct thread *td;
register struct olstat_args /* {
char *path;
struct ostat *ub;
} */ *uap;
{
struct vnode *vp;
struct stat sb;
struct ostat osb;
int error;
struct nameidata nd;
NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF | NOOBJ, UIO_USERSPACE,
uap->path, td);
if ((error = namei(&nd)) != 0)
return (error);
vp = nd.ni_vp;
error = vn_stat(vp, &sb, td->td_ucred, NOCRED, td);
NDFREE(&nd, NDF_ONLY_PNBUF);
vput(vp);
if (error)
return (error);
cvtstat(&sb, &osb);
error = copyout(&osb, uap->ub, sizeof (osb));
return (error);
}
/*
* Convert from an old to a new stat structure.
*/
void
cvtstat(st, ost)
struct stat *st;
struct ostat *ost;
{
ost->st_dev = st->st_dev;
ost->st_ino = st->st_ino;
ost->st_mode = st->st_mode;
ost->st_nlink = st->st_nlink;
ost->st_uid = st->st_uid;
ost->st_gid = st->st_gid;
ost->st_rdev = st->st_rdev;
if (st->st_size < (quad_t)1 << 32)
ost->st_size = st->st_size;
else
ost->st_size = -2;
ost->st_atime = st->st_atime;
ost->st_mtime = st->st_mtime;
ost->st_ctime = st->st_ctime;
ost->st_blksize = st->st_blksize;
ost->st_blocks = st->st_blocks;
ost->st_flags = st->st_flags;
ost->st_gen = st->st_gen;
}
#endif /* COMPAT_43 || COMPAT_SUNOS */
/*
* Get file status; this version follows links.
*/
#ifndef _SYS_SYSPROTO_H_
struct stat_args {
char *path;
struct stat *ub;
};
#endif
/* ARGSUSED */
int
stat(td, uap)
struct thread *td;
register struct stat_args /* {
char *path;
struct stat *ub;
} */ *uap;
{
struct stat sb;
int error;
struct nameidata nd;
#ifdef LOOKUP_SHARED
NDINIT(&nd, LOOKUP, FOLLOW | LOCKSHARED | LOCKLEAF | NOOBJ,
UIO_USERSPACE, uap->path, td);
#else
NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | NOOBJ, UIO_USERSPACE,
uap->path, td);
#endif
if ((error = namei(&nd)) != 0)
return (error);
error = vn_stat(nd.ni_vp, &sb, td->td_ucred, NOCRED, td);
NDFREE(&nd, NDF_ONLY_PNBUF);
vput(nd.ni_vp);
if (error)
return (error);
error = copyout(&sb, uap->ub, sizeof (sb));
return (error);
}
/*
* Get file status; this version does not follow links.
*/
#ifndef _SYS_SYSPROTO_H_
struct lstat_args {
char *path;
struct stat *ub;
};
#endif
/* ARGSUSED */
int
lstat(td, uap)
struct thread *td;
register struct lstat_args /* {
char *path;
struct stat *ub;
} */ *uap;
{
int error;
struct vnode *vp;
struct stat sb;
struct nameidata nd;
NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF | NOOBJ, UIO_USERSPACE,
uap->path, td);
if ((error = namei(&nd)) != 0)
return (error);
vp = nd.ni_vp;
error = vn_stat(vp, &sb, td->td_ucred, NOCRED, td);
NDFREE(&nd, NDF_ONLY_PNBUF);
vput(vp);
if (error)
return (error);
error = copyout(&sb, uap->ub, sizeof (sb));
return (error);
}
/*
* Implementation of the NetBSD stat() function.
* XXX This should probably be collapsed with the FreeBSD version,
* as the differences are only due to vn_stat() clearing spares at
* the end of the structures. vn_stat could be split to avoid this,
* and thus collapse the following to close to zero code.
*/
void
cvtnstat(sb, nsb)
struct stat *sb;
struct nstat *nsb;
{
bzero(nsb, sizeof *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_birthtimespec = sb->st_birthtimespec;
}
#ifndef _SYS_SYSPROTO_H_
struct nstat_args {
char *path;
struct nstat *ub;
};
#endif
/* ARGSUSED */
int
nstat(td, uap)
struct thread *td;
register struct nstat_args /* {
char *path;
struct nstat *ub;
} */ *uap;
{
struct stat sb;
struct nstat nsb;
int error;
struct nameidata nd;
NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | NOOBJ, UIO_USERSPACE,
uap->path, td);
if ((error = namei(&nd)) != 0)
return (error);
NDFREE(&nd, NDF_ONLY_PNBUF);
error = vn_stat(nd.ni_vp, &sb, td->td_ucred, NOCRED, td);
vput(nd.ni_vp);
if (error)
return (error);
cvtnstat(&sb, &nsb);
error = copyout(&nsb, uap->ub, sizeof (nsb));
return (error);
}
/*
* NetBSD lstat. Get file status; this version does not follow links.
*/
#ifndef _SYS_SYSPROTO_H_
struct lstat_args {
char *path;
struct stat *ub;
};
#endif
/* ARGSUSED */
int
nlstat(td, uap)
struct thread *td;
register struct nlstat_args /* {
char *path;
struct nstat *ub;
} */ *uap;
{
int error;
struct vnode *vp;
struct stat sb;
struct nstat nsb;
struct nameidata nd;
NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF | NOOBJ, UIO_USERSPACE,
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->td_ucred, NOCRED, td);
vput(vp);
if (error)
return (error);
cvtnstat(&sb, &nsb);
error = copyout(&nsb, uap->ub, sizeof (nsb));
return (error);
}
/*
* Get configurable pathname variables.
*/
#ifndef _SYS_SYSPROTO_H_
struct pathconf_args {
char *path;
int name;
};
#endif
/* ARGSUSED */
int
pathconf(td, uap)
struct thread *td;
register struct pathconf_args /* {
char *path;
int name;
} */ *uap;
{
int error;
struct nameidata nd;
NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | NOOBJ, UIO_USERSPACE,
uap->path, td);
if ((error = namei(&nd)) != 0)
return (error);
NDFREE(&nd, NDF_ONLY_PNBUF);
/* If asynchronous I/O is available, it works for all files. */
if (uap->name == _PC_ASYNC_IO)
td->td_retval[0] = async_io_version;
else
error = VOP_PATHCONF(nd.ni_vp, uap->name, td->td_retval);
vput(nd.ni_vp);
return (error);
}
/*
* Return target name of a symbolic link.
*/
#ifndef _SYS_SYSPROTO_H_
struct readlink_args {
char *path;
char *buf;
int count;
};
#endif
/* ARGSUSED */
int
readlink(td, uap)
struct thread *td;
register struct readlink_args /* {
char *path;
char *buf;
int count;
} */ *uap;
{
return (kern_readlink(td, uap->path, UIO_USERSPACE, uap->buf,
UIO_USERSPACE, uap->count));
}
int
kern_readlink(struct thread *td, char *path, enum uio_seg pathseg, char *buf,
enum uio_seg bufseg, int count)
{
register struct vnode *vp;
struct iovec aiov;
struct uio auio;
int error;
struct nameidata nd;
NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF | NOOBJ, pathseg, path, td);
if ((error = namei(&nd)) != 0)
return (error);
NDFREE(&nd, NDF_ONLY_PNBUF);
vp = nd.ni_vp;
#ifdef MAC
error = mac_check_vnode_readlink(td->td_ucred, vp);
if (error) {
vput(vp);
return (error);
}
#endif
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 = bufseg;
auio.uio_td = td;
auio.uio_resid = count;
error = VOP_READLINK(vp, &auio, td->td_ucred);
}
vput(vp);
td->td_retval[0] = count - auio.uio_resid;
return (error);
}
/*
* Common implementation code for chflags() and fchflags().
*/
static int
setfflags(td, vp, flags)
struct thread *td;
struct vnode *vp;
int flags;
{
int error;
struct mount *mp;
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(td->td_ucred, PRISON_ROOT);
if (error)
return (error);
}
if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0)
return (error);
VOP_LEASE(vp, td, td->td_ucred, LEASE_WRITE);
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
VATTR_NULL(&vattr);
vattr.va_flags = flags;
#ifdef MAC
error = mac_check_vnode_setflags(td->td_ucred, vp, vattr.va_flags);
if (error == 0)
#endif
error = VOP_SETATTR(vp, &vattr, td->td_ucred, td);
VOP_UNLOCK(vp, 0, td);
vn_finished_write(mp);
return (error);
}
/*
* Change flags of a file given a path name.
*/
#ifndef _SYS_SYSPROTO_H_
struct chflags_args {
char *path;
int flags;
};
#endif
/* ARGSUSED */
int
chflags(td, uap)
struct thread *td;
register struct chflags_args /* {
char *path;
int flags;
} */ *uap;
{
int error;
struct nameidata nd;
NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, uap->path, td);
if ((error = namei(&nd)) != 0)
return (error);
NDFREE(&nd, NDF_ONLY_PNBUF);
error = setfflags(td, nd.ni_vp, uap->flags);
vrele(nd.ni_vp);
return (error);
}
/*
* Same as chflags() but doesn't follow symlinks.
*/
int
lchflags(td, uap)
struct thread *td;
register struct lchflags_args /* {
char *path;
int flags;
} */ *uap;
{
int error;
struct nameidata nd;
NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, uap->path, td);
if ((error = namei(&nd)) != 0)
return (error);
NDFREE(&nd, NDF_ONLY_PNBUF);
error = setfflags(td, nd.ni_vp, uap->flags);
vrele(nd.ni_vp);
return (error);
}
/*
* Change flags of a file given a file descriptor.
*/
#ifndef _SYS_SYSPROTO_H_
struct fchflags_args {
int fd;
int flags;
};
#endif
/* ARGSUSED */
int
fchflags(td, uap)
struct thread *td;
register struct fchflags_args /* {
int fd;
int flags;
} */ *uap;
{
struct file *fp;
int error;
if ((error = getvnode(td->td_proc->p_fd, uap->fd, &fp)) != 0)
return (error);
error = setfflags(td, fp->f_vnode, uap->flags);
fdrop(fp, td);
return (error);
}
/*
* Common implementation code for chmod(), lchmod() and fchmod().
*/
static int
setfmode(td, vp, mode)
struct thread *td;
struct vnode *vp;
int mode;
{
int error;
struct mount *mp;
struct vattr vattr;
if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0)
return (error);
VOP_LEASE(vp, td, td->td_ucred, LEASE_WRITE);
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
VATTR_NULL(&vattr);
vattr.va_mode = mode & ALLPERMS;
#ifdef MAC
error = mac_check_vnode_setmode(td->td_ucred, vp, vattr.va_mode);
if (error == 0)
#endif
error = VOP_SETATTR(vp, &vattr, td->td_ucred, td);
VOP_UNLOCK(vp, 0, td);
vn_finished_write(mp);
return (error);
}
/*
* Change mode of a file given path name.
*/
#ifndef _SYS_SYSPROTO_H_
struct chmod_args {
char *path;
int mode;
};
#endif
/* ARGSUSED */
int
chmod(td, uap)
struct thread *td;
register struct chmod_args /* {
char *path;
int mode;
} */ *uap;
{
return (kern_chmod(td, uap->path, UIO_USERSPACE, uap->mode));
}
int
kern_chmod(struct thread *td, char *path, enum uio_seg pathseg, int mode)
{
int error;
struct nameidata nd;
NDINIT(&nd, LOOKUP, FOLLOW, pathseg, path, td);
if ((error = namei(&nd)) != 0)
return (error);
NDFREE(&nd, NDF_ONLY_PNBUF);
error = setfmode(td, nd.ni_vp, mode);
vrele(nd.ni_vp);
return (error);
}
/*
* Change mode of a file given path name (don't follow links.)
*/
#ifndef _SYS_SYSPROTO_H_
struct lchmod_args {
char *path;
int mode;
};
#endif
/* ARGSUSED */
int
lchmod(td, uap)
struct thread *td;
register struct lchmod_args /* {
char *path;
int mode;
} */ *uap;
{
int error;
struct nameidata nd;
NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, uap->path, td);
if ((error = namei(&nd)) != 0)
return (error);
NDFREE(&nd, NDF_ONLY_PNBUF);
error = setfmode(td, nd.ni_vp, uap->mode);
vrele(nd.ni_vp);
return (error);
}
/*
* Change mode of a file given a file descriptor.
*/
#ifndef _SYS_SYSPROTO_H_
struct fchmod_args {
int fd;
int mode;
};
#endif
/* ARGSUSED */
int
fchmod(td, uap)
struct thread *td;
register struct fchmod_args /* {
int fd;
int mode;
} */ *uap;
{
struct file *fp;
int error;
if ((error = getvnode(td->td_proc->p_fd, uap->fd, &fp)) != 0)
return (error);
error = setfmode(td, fp->f_vnode, uap->mode);
fdrop(fp, td);
return (error);
}
/*
* Common implementation for chown(), lchown(), and fchown()
*/
static int
setfown(td, vp, uid, gid)
struct thread *td;
struct vnode *vp;
uid_t uid;
gid_t gid;
{
int error;
struct mount *mp;
struct vattr vattr;
if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0)
return (error);
VOP_LEASE(vp, td, td->td_ucred, LEASE_WRITE);
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
VATTR_NULL(&vattr);
vattr.va_uid = uid;
vattr.va_gid = gid;
#ifdef MAC
error = mac_check_vnode_setowner(td->td_ucred, vp, vattr.va_uid,
vattr.va_gid);
if (error == 0)
#endif
error = VOP_SETATTR(vp, &vattr, td->td_ucred, td);
VOP_UNLOCK(vp, 0, td);
vn_finished_write(mp);
return (error);
}
/*
* Set ownership given a path name.
*/
#ifndef _SYS_SYSPROTO_H_
struct chown_args {
char *path;
int uid;
int gid;
};
#endif
/* ARGSUSED */
int
chown(td, uap)
struct thread *td;
register struct chown_args /* {
char *path;
int uid;
int gid;
} */ *uap;
{
return (kern_chown(td, uap->path, UIO_USERSPACE, uap->uid, uap->gid));
}
int
kern_chown(struct thread *td, char *path, enum uio_seg pathseg, int uid,
int gid)
{
int error;
struct nameidata nd;
NDINIT(&nd, LOOKUP, FOLLOW, pathseg, path, td);
if ((error = namei(&nd)) != 0)
return (error);
NDFREE(&nd, NDF_ONLY_PNBUF);
error = setfown(td, nd.ni_vp, uid, gid);
vrele(nd.ni_vp);
return (error);
}
/*
* Set ownership given a path name, do not cross symlinks.
*/
#ifndef _SYS_SYSPROTO_H_
struct lchown_args {
char *path;
int uid;
int gid;
};
#endif
/* ARGSUSED */
int
lchown(td, uap)
struct thread *td;
register struct lchown_args /* {
char *path;
int uid;
int gid;
} */ *uap;
{
return (kern_lchown(td, uap->path, UIO_USERSPACE, uap->uid, uap->gid));
}
int
kern_lchown(struct thread *td, char *path, enum uio_seg pathseg, int uid,
int gid)
{
int error;
struct nameidata nd;
NDINIT(&nd, LOOKUP, NOFOLLOW, pathseg, path, td);
if ((error = namei(&nd)) != 0)
return (error);
NDFREE(&nd, NDF_ONLY_PNBUF);
error = setfown(td, nd.ni_vp, uid, gid);
vrele(nd.ni_vp);
return (error);
}
/*
* Set ownership given a file descriptor.
*/
#ifndef _SYS_SYSPROTO_H_
struct fchown_args {
int fd;
int uid;
int gid;
};
#endif
/* ARGSUSED */
int
fchown(td, uap)
struct thread *td;
register struct fchown_args /* {
int fd;
int uid;
int gid;
} */ *uap;
{
struct file *fp;
int error;
if ((error = getvnode(td->td_proc->p_fd, uap->fd, &fp)) != 0)
return (error);
error = setfown(td, fp->f_vnode, uap->uid, uap->gid);
fdrop(fp, td);
return (error);
}
/*
* Common implementation code for utimes(), lutimes(), and futimes().
*/
static int
getutimes(usrtvp, tvpseg, tsp)
const struct timeval *usrtvp;
enum uio_seg tvpseg;
struct timespec *tsp;
{
struct timeval tv[2];
const struct timeval *tvp;
int error;
if (usrtvp == NULL) {
microtime(&tv[0]);
TIMEVAL_TO_TIMESPEC(&tv[0], &tsp[0]);
tsp[1] = tsp[0];
} else {
if (tvpseg == UIO_SYSSPACE) {
tvp = usrtvp;
} else {
if ((error = copyin(usrtvp, tv, sizeof(tv))) != 0)
return (error);
tvp = tv;
}
TIMEVAL_TO_TIMESPEC(&tvp[0], &tsp[0]);
TIMEVAL_TO_TIMESPEC(&tvp[1], &tsp[1]);
}
return (0);
}
/*
* Common implementation code for utimes(), lutimes(), and futimes().
*/
static int
setutimes(td, vp, ts, numtimes, nullflag)
struct thread *td;
struct vnode *vp;
const struct timespec *ts;
int numtimes;
int nullflag;
{
int error, setbirthtime;
struct mount *mp;
struct vattr vattr;
if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0)
return (error);
VOP_LEASE(vp, td, td->td_ucred, LEASE_WRITE);
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
setbirthtime = 0;
if (numtimes < 3 && VOP_GETATTR(vp, &vattr, td->td_ucred, td) == 0 &&
timespeccmp(&ts[1], &vattr.va_birthtime, < ))
setbirthtime = 1;
VATTR_NULL(&vattr);
vattr.va_atime = ts[0];
vattr.va_mtime = ts[1];
if (setbirthtime)
vattr.va_birthtime = ts[1];
if (numtimes > 2)
vattr.va_birthtime = ts[2];
if (nullflag)
vattr.va_vaflags |= VA_UTIMES_NULL;
#ifdef MAC
error = mac_check_vnode_setutimes(td->td_ucred, vp, vattr.va_atime,
vattr.va_mtime);
#endif
if (error == 0)
error = VOP_SETATTR(vp, &vattr, td->td_ucred, td);
VOP_UNLOCK(vp, 0, td);
vn_finished_write(mp);
return (error);
}
/*
* Set the access and modification times of a file.
*/
#ifndef _SYS_SYSPROTO_H_
struct utimes_args {
char *path;
struct timeval *tptr;
};
#endif
/* ARGSUSED */
int
utimes(td, uap)
struct thread *td;
register struct utimes_args /* {
char *path;
struct timeval *tptr;
} */ *uap;
{
return (kern_utimes(td, uap->path, UIO_USERSPACE, uap->tptr,
UIO_USERSPACE));
}
int
kern_utimes(struct thread *td, char *path, enum uio_seg pathseg,
struct timeval *tptr, enum uio_seg tptrseg)
{
struct timespec ts[2];
int error;
struct nameidata nd;
if ((error = getutimes(tptr, tptrseg, ts)) != 0)
return (error);
NDINIT(&nd, LOOKUP, FOLLOW, pathseg, path, td);
if ((error = namei(&nd)) != 0)
return (error);
NDFREE(&nd, NDF_ONLY_PNBUF);
error = setutimes(td, nd.ni_vp, ts, 2, tptr == NULL);
vrele(nd.ni_vp);
return (error);
}
/*
* Set the access and modification times of a file.
*/
#ifndef _SYS_SYSPROTO_H_
struct lutimes_args {
char *path;
struct timeval *tptr;
};
#endif
/* ARGSUSED */
int
lutimes(td, uap)
struct thread *td;
register struct lutimes_args /* {
char *path;
struct timeval *tptr;
} */ *uap;
{
return (kern_lutimes(td, uap->path, UIO_USERSPACE, uap->tptr,
UIO_USERSPACE));
}
int
kern_lutimes(struct thread *td, char *path, enum uio_seg pathseg,
struct timeval *tptr, enum uio_seg tptrseg)
{
struct timespec ts[2];
int error;
struct nameidata nd;
if ((error = getutimes(tptr, tptrseg, ts)) != 0)
return (error);
NDINIT(&nd, LOOKUP, NOFOLLOW, pathseg, path, td);
if ((error = namei(&nd)) != 0)
return (error);
NDFREE(&nd, NDF_ONLY_PNBUF);
error = setutimes(td, nd.ni_vp, ts, 2, tptr == NULL);
vrele(nd.ni_vp);
return (error);
}
/*
* Set the access and modification times of a file.
*/
#ifndef _SYS_SYSPROTO_H_
struct futimes_args {
int fd;
struct timeval *tptr;
};
#endif
/* ARGSUSED */
int
futimes(td, uap)
struct thread *td;
register struct futimes_args /* {
int fd;
struct timeval *tptr;
} */ *uap;
{
return (kern_futimes(td, uap->fd, uap->tptr, UIO_USERSPACE));
}
int
kern_futimes(struct thread *td, int fd, struct timeval *tptr,
enum uio_seg tptrseg)
{
struct timespec ts[2];
struct file *fp;
int error;
if ((error = getutimes(tptr, tptrseg, ts)) != 0)
return (error);
if ((error = getvnode(td->td_proc->p_fd, fd, &fp)) != 0)
return (error);
error = setutimes(td, fp->f_vnode, ts, 2, tptr == NULL);
fdrop(fp, td);
return (error);
}
/*
* Truncate a file given its path name.
*/
#ifndef _SYS_SYSPROTO_H_
struct truncate_args {
char *path;
int pad;
off_t length;
};
#endif
/* ARGSUSED */
int
truncate(td, uap)
struct thread *td;
register struct truncate_args /* {
char *path;
int pad;
off_t length;
} */ *uap;
{
return (kern_truncate(td, uap->path, UIO_USERSPACE, uap->length));
}
int
kern_truncate(struct thread *td, char *path, enum uio_seg pathseg, off_t length)
{
struct mount *mp;
struct vnode *vp;
struct vattr vattr;
int error;
struct nameidata nd;
if (length < 0)
return(EINVAL);
NDINIT(&nd, LOOKUP, FOLLOW, pathseg, path, td);
if ((error = namei(&nd)) != 0)
return (error);
vp = nd.ni_vp;
if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) {
vrele(vp);
return (error);
}
NDFREE(&nd, NDF_ONLY_PNBUF);
VOP_LEASE(vp, td, td->td_ucred, LEASE_WRITE);
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
if (vp->v_type == VDIR)
error = EISDIR;
#ifdef MAC
else if ((error = mac_check_vnode_write(td->td_ucred, NOCRED, vp))) {
}
#endif
else if ((error = vn_writechk(vp)) == 0 &&
(error = VOP_ACCESS(vp, VWRITE, td->td_ucred, td)) == 0) {
VATTR_NULL(&vattr);
vattr.va_size = length;
error = VOP_SETATTR(vp, &vattr, td->td_ucred, td);
}
vput(vp);
vn_finished_write(mp);
return (error);
}
/*
* Truncate a file given a file descriptor.
*/
#ifndef _SYS_SYSPROTO_H_
struct ftruncate_args {
int fd;
int pad;
off_t length;
};
#endif
/* ARGSUSED */
int
ftruncate(td, uap)
struct thread *td;
register struct ftruncate_args /* {
int fd;
int pad;
off_t length;
} */ *uap;
{
struct mount *mp;
struct vattr vattr;
struct vnode *vp;
struct file *fp;
int error;
if (uap->length < 0)
return(EINVAL);
if ((error = getvnode(td->td_proc->p_fd, uap->fd, &fp)) != 0)
return (error);
if ((fp->f_flag & FWRITE) == 0) {
fdrop(fp, td);
return (EINVAL);
}
vp = fp->f_vnode;
if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) {
fdrop(fp, td);
return (error);
}
VOP_LEASE(vp, td, td->td_ucred, LEASE_WRITE);
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
if (vp->v_type == VDIR)
error = EISDIR;
#ifdef MAC
else if ((error = mac_check_vnode_write(td->td_ucred, fp->f_cred,
vp))) {
}
#endif
else if ((error = vn_writechk(vp)) == 0) {
VATTR_NULL(&vattr);
vattr.va_size = uap->length;
error = VOP_SETATTR(vp, &vattr, fp->f_cred, td);
}
VOP_UNLOCK(vp, 0, td);
vn_finished_write(mp);
fdrop(fp, td);
return (error);
}
#if defined(COMPAT_43) || defined(COMPAT_SUNOS)
/*
* Truncate a file given its path name.
*/
#ifndef _SYS_SYSPROTO_H_
struct otruncate_args {
char *path;
long length;
};
#endif
/* ARGSUSED */
int
otruncate(td, uap)
struct thread *td;
register struct otruncate_args /* {
char *path;
long length;
} */ *uap;
{
struct truncate_args /* {
char *path;
int pad;
off_t length;
} */ nuap;
nuap.path = uap->path;
nuap.length = uap->length;
return (truncate(td, &nuap));
}
/*
* Truncate a file given a file descriptor.
*/
#ifndef _SYS_SYSPROTO_H_
struct oftruncate_args {
int fd;
long length;
};
#endif
/* ARGSUSED */
int
oftruncate(td, uap)
struct thread *td;
register struct oftruncate_args /* {
int fd;
long length;
} */ *uap;
{
struct ftruncate_args /* {
int fd;
int pad;
off_t length;
} */ nuap;
nuap.fd = uap->fd;
nuap.length = uap->length;
return (ftruncate(td, &nuap));
}
#endif /* COMPAT_43 || COMPAT_SUNOS */
/*
* Sync an open file.
*/
#ifndef _SYS_SYSPROTO_H_
struct fsync_args {
int fd;
};
#endif
/* ARGSUSED */
int
fsync(td, uap)
struct thread *td;
struct fsync_args /* {
int fd;
} */ *uap;
{
struct vnode *vp;
struct mount *mp;
struct file *fp;
vm_object_t obj;
int error;
GIANT_REQUIRED;
if ((error = getvnode(td->td_proc->p_fd, uap->fd, &fp)) != 0)
return (error);
vp = fp->f_vnode;
if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) {
fdrop(fp, td);
return (error);
}
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
if (VOP_GETVOBJECT(vp, &obj) == 0) {
VM_OBJECT_LOCK(obj);
vm_object_page_clean(obj, 0, 0, 0);
VM_OBJECT_UNLOCK(obj);
}
error = VOP_FSYNC(vp, fp->f_cred, MNT_WAIT, td);
if (error == 0 && vp->v_mount && (vp->v_mount->mnt_flag & MNT_SOFTDEP)
&& softdep_fsync_hook != NULL)
error = (*softdep_fsync_hook)(vp);
VOP_UNLOCK(vp, 0, td);
vn_finished_write(mp);
fdrop(fp, td);
return (error);
}
/*
* Rename files. Source and destination must either both be directories,
* or both not be directories. If target is a directory, it must be empty.
*/
#ifndef _SYS_SYSPROTO_H_
struct rename_args {
char *from;
char *to;
};
#endif
/* ARGSUSED */
int
rename(td, uap)
struct thread *td;
register struct rename_args /* {
char *from;
char *to;
} */ *uap;
{
return (kern_rename(td, uap->from, uap->to, UIO_USERSPACE));
}
int
kern_rename(struct thread *td, char *from, char *to, enum uio_seg pathseg)
{
struct mount *mp = NULL;
struct vnode *tvp, *fvp, *tdvp;
struct nameidata fromnd, tond;
int error;
bwillwrite();
#ifdef MAC
NDINIT(&fromnd, DELETE, LOCKPARENT | LOCKLEAF | SAVESTART, pathseg,
from, td);
#else
NDINIT(&fromnd, DELETE, WANTPARENT | SAVESTART, pathseg, from, td);
#endif
if ((error = namei(&fromnd)) != 0)
return (error);
#ifdef MAC
error = mac_check_vnode_rename_from(td->td_ucred, fromnd.ni_dvp,
fromnd.ni_vp, &fromnd.ni_cnd);
VOP_UNLOCK(fromnd.ni_dvp, 0, td);
VOP_UNLOCK(fromnd.ni_vp, 0, td);
#endif
fvp = fromnd.ni_vp;
if (error == 0)
error = vn_start_write(fvp, &mp, V_WAIT | PCATCH);
if (error != 0) {
NDFREE(&fromnd, NDF_ONLY_PNBUF);
vrele(fromnd.ni_dvp);
vrele(fvp);
goto out1;
}
NDINIT(&tond, RENAME, LOCKPARENT | LOCKLEAF | NOCACHE | SAVESTART |
NOOBJ, pathseg, to, td);
if (fromnd.ni_vp->v_type == VDIR)
tond.ni_cnd.cn_flags |= WILLBEDIR;
if ((error = namei(&tond)) != 0) {
/* 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;
#ifdef MAC
else
error = mac_check_vnode_rename_to(td->td_ucred, tdvp,
tond.ni_vp, fromnd.ni_dvp == tdvp, &tond.ni_cnd);
#endif
out:
if (!error) {
VOP_LEASE(tdvp, td, td->td_ucred, LEASE_WRITE);
if (fromnd.ni_dvp != tdvp) {
VOP_LEASE(fromnd.ni_dvp, td, td->td_ucred, LEASE_WRITE);
}
if (tvp) {
VOP_LEASE(tvp, td, td->td_ucred, LEASE_WRITE);
}
error = VOP_RENAME(fromnd.ni_dvp, fromnd.ni_vp, &fromnd.ni_cnd,
tond.ni_dvp, 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:
vn_finished_write(mp);
if (fromnd.ni_startdir)
vrele(fromnd.ni_startdir);
if (error == -1)
return (0);
return (error);
}
/*
* Make a directory file.
*/
#ifndef _SYS_SYSPROTO_H_
struct mkdir_args {
char *path;
int mode;
};
#endif
/* ARGSUSED */
int
mkdir(td, uap)
struct thread *td;
register struct mkdir_args /* {
char *path;
int mode;
} */ *uap;
{
return (kern_mkdir(td, uap->path, UIO_USERSPACE, uap->mode));
}
int
kern_mkdir(struct thread *td, char *path, enum uio_seg segflg, int mode)
{
struct mount *mp;
struct vnode *vp;
struct vattr vattr;
int error;
struct nameidata nd;
restart:
bwillwrite();
NDINIT(&nd, CREATE, LOCKPARENT | SAVENAME, segflg, path, td);
nd.ni_cnd.cn_flags |= WILLBEDIR;
if ((error = namei(&nd)) != 0)
return (error);
vp = nd.ni_vp;
if (vp != NULL) {
NDFREE(&nd, NDF_ONLY_PNBUF);
vrele(vp);
/*
* XXX namei called with LOCKPARENT but not LOCKLEAF has
* the strange behaviour of leaving the vnode unlocked
* if the target is the same vnode as the parent.
*/
if (vp == nd.ni_dvp)
vrele(nd.ni_dvp);
else
vput(nd.ni_dvp);
return (EEXIST);
}
if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) {
NDFREE(&nd, NDF_ONLY_PNBUF);
vput(nd.ni_dvp);
if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0)
return (error);
goto restart;
}
VATTR_NULL(&vattr);
vattr.va_type = VDIR;
FILEDESC_LOCK(td->td_proc->p_fd);
vattr.va_mode = (mode & ACCESSPERMS) &~ td->td_proc->p_fd->fd_cmask;
FILEDESC_UNLOCK(td->td_proc->p_fd);
#ifdef MAC
error = mac_check_vnode_create(td->td_ucred, nd.ni_dvp, &nd.ni_cnd,
&vattr);
if (error)
goto out;
#endif
VOP_LEASE(nd.ni_dvp, td, td->td_ucred, LEASE_WRITE);
error = VOP_MKDIR(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr);
#ifdef MAC
out:
#endif
NDFREE(&nd, NDF_ONLY_PNBUF);
vput(nd.ni_dvp);
if (!error)
vput(nd.ni_vp);
vn_finished_write(mp);
ASSERT_VOP_UNLOCKED(nd.ni_dvp, "mkdir");
ASSERT_VOP_UNLOCKED(nd.ni_vp, "mkdir");
return (error);
}
/*
* Remove a directory file.
*/
#ifndef _SYS_SYSPROTO_H_
struct rmdir_args {
char *path;
};
#endif
/* ARGSUSED */
int
rmdir(td, uap)
struct thread *td;
struct rmdir_args /* {
char *path;
} */ *uap;
{
return (kern_rmdir(td, uap->path, UIO_USERSPACE));
}
int
kern_rmdir(struct thread *td, char *path, enum uio_seg pathseg)
{
struct mount *mp;
struct vnode *vp;
int error;
struct nameidata nd;
restart:
bwillwrite();
NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF, pathseg, path, td);
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) {
error = EBUSY;
goto out;
}
#ifdef MAC
error = mac_check_vnode_delete(td->td_ucred, nd.ni_dvp, vp,
&nd.ni_cnd);
if (error)
goto out;
#endif
if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) {
NDFREE(&nd, NDF_ONLY_PNBUF);
if (nd.ni_dvp == vp)
vrele(nd.ni_dvp);
else
vput(nd.ni_dvp);
vput(vp);
if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0)
return (error);
goto restart;
}
VOP_LEASE(nd.ni_dvp, td, td->td_ucred, LEASE_WRITE);
VOP_LEASE(vp, td, td->td_ucred, LEASE_WRITE);
error = VOP_RMDIR(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd);
vn_finished_write(mp);
out:
NDFREE(&nd, NDF_ONLY_PNBUF);
if (nd.ni_dvp == vp)
vrele(nd.ni_dvp);
else
vput(nd.ni_dvp);
vput(vp);
ASSERT_VOP_UNLOCKED(nd.ni_dvp, "rmdir");
ASSERT_VOP_UNLOCKED(nd.ni_vp, "rmdir");
return (error);
}
#ifdef COMPAT_43
/*
* Read a block of directory entries in a filesystem independent format.
*/
#ifndef _SYS_SYSPROTO_H_
struct ogetdirentries_args {
int fd;
char *buf;
u_int count;
long *basep;
};
#endif
int
ogetdirentries(td, uap)
struct thread *td;
register struct ogetdirentries_args /* {
int fd;
char *buf;
u_int count;
long *basep;
} */ *uap;
{
struct vnode *vp;
struct file *fp;
struct uio auio, kuio;
struct iovec aiov, kiov;
struct dirent *dp, *edp;
caddr_t dirbuf;
int error, eofflag, readcnt;
long loff;
/* XXX arbitrary sanity limit on `count'. */
if (uap->count > 64 * 1024)
return (EINVAL);
if ((error = getvnode(td->td_proc->p_fd, uap->fd, &fp)) != 0)
return (error);
if ((fp->f_flag & FREAD) == 0) {
fdrop(fp, td);
return (EBADF);
}
vp = fp->f_vnode;
unionread:
if (vp->v_type != VDIR) {
fdrop(fp, td);
return (EINVAL);
}
aiov.iov_base = uap->buf;
aiov.iov_len = uap->count;
auio.uio_iov = &aiov;
auio.uio_iovcnt = 1;
auio.uio_rw = UIO_READ;
auio.uio_segflg = UIO_USERSPACE;
auio.uio_td = td;
auio.uio_resid = uap->count;
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
loff = auio.uio_offset = fp->f_offset;
#ifdef MAC
error = mac_check_vnode_readdir(td->td_ucred, vp);
if (error) {
VOP_UNLOCK(vp, 0, td);
fdrop(fp, td);
return (error);
}
#endif
# if (BYTE_ORDER != LITTLE_ENDIAN)
if (vp->v_mount->mnt_maxsymlinklen <= 0) {
error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag,
NULL, NULL);
fp->f_offset = auio.uio_offset;
} else
# endif
{
kuio = auio;
kuio.uio_iov = &kiov;
kuio.uio_segflg = UIO_SYSSPACE;
kiov.iov_len = uap->count;
MALLOC(dirbuf, caddr_t, uap->count, M_TEMP, M_WAITOK);
kiov.iov_base = dirbuf;
error = VOP_READDIR(vp, &kuio, fp->f_cred, &eofflag,
NULL, NULL);
fp->f_offset = kuio.uio_offset;
if (error == 0) {
readcnt = uap->count - kuio.uio_resid;
edp = (struct dirent *)&dirbuf[readcnt];
for (dp = (struct dirent *)dirbuf; dp < edp; ) {
# if (BYTE_ORDER == LITTLE_ENDIAN)
/*
* The expected low byte of
* dp->d_namlen is our dp->d_type.
* The high MBZ byte of dp->d_namlen
* is our dp->d_namlen.
*/
dp->d_type = dp->d_namlen;
dp->d_namlen = 0;
# else
/*
* The dp->d_type is the high byte
* of the expected dp->d_namlen,
* so must be zero'ed.
*/
dp->d_type = 0;
# endif
if (dp->d_reclen > 0) {
dp = (struct dirent *)
((char *)dp + dp->d_reclen);
} else {
error = EIO;
break;
}
}
if (dp >= edp)
error = uiomove(dirbuf, readcnt, &auio);
}
FREE(dirbuf, M_TEMP);
}
VOP_UNLOCK(vp, 0, td);
if (error) {
fdrop(fp, td);
return (error);
}
if (uap->count == auio.uio_resid) {
if (union_dircheckp) {
error = union_dircheckp(td, &vp, fp);
if (error == -1)
goto unionread;
if (error) {
fdrop(fp, td);
return (error);
}
}
/*
* XXX We could delay dropping the lock above but
* union_dircheckp complicates things.
*/
vn_lock(vp, LK_EXCLUSIVE|LK_RETRY, td);
if ((vp->v_vflag & VV_ROOT) &&
(vp->v_mount->mnt_flag & MNT_UNION)) {
struct vnode *tvp = vp;
vp = vp->v_mount->mnt_vnodecovered;
VREF(vp);
fp->f_vnode = vp;
fp->f_data = vp;
fp->f_offset = 0;
vput(tvp);
goto unionread;
}
VOP_UNLOCK(vp, 0, td);
}
error = copyout(&loff, uap->basep, sizeof(long));
fdrop(fp, td);
td->td_retval[0] = uap->count - auio.uio_resid;
return (error);
}
#endif /* COMPAT_43 */
/*
* Read a block of directory entries in a filesystem independent format.
*/
#ifndef _SYS_SYSPROTO_H_
struct getdirentries_args {
int fd;
char *buf;
u_int count;
long *basep;
};
#endif
int
getdirentries(td, uap)
struct thread *td;
register struct getdirentries_args /* {
int fd;
char *buf;
u_int count;
long *basep;
} */ *uap;
{
struct vnode *vp;
struct file *fp;
struct uio auio;
struct iovec aiov;
long loff;
int error, eofflag;
if ((error = getvnode(td->td_proc->p_fd, uap->fd, &fp)) != 0)
return (error);
if ((fp->f_flag & FREAD) == 0) {
fdrop(fp, td);
return (EBADF);
}
vp = fp->f_vnode;
unionread:
if (vp->v_type != VDIR) {
fdrop(fp, td);
return (EINVAL);
}
aiov.iov_base = uap->buf;
aiov.iov_len = uap->count;
auio.uio_iov = &aiov;
auio.uio_iovcnt = 1;
auio.uio_rw = UIO_READ;
auio.uio_segflg = UIO_USERSPACE;
auio.uio_td = td;
auio.uio_resid = uap->count;
/* vn_lock(vp, LK_SHARED | LK_RETRY, td); */
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
loff = auio.uio_offset = fp->f_offset;
#ifdef MAC
error = mac_check_vnode_readdir(td->td_ucred, vp);
if (error == 0)
#endif
error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag, NULL,
NULL);
fp->f_offset = auio.uio_offset;
VOP_UNLOCK(vp, 0, td);
if (error) {
fdrop(fp, td);
return (error);
}
if (uap->count == auio.uio_resid) {
if (union_dircheckp) {
error = union_dircheckp(td, &vp, fp);
if (error == -1)
goto unionread;
if (error) {
fdrop(fp, td);
return (error);
}
}
/*
* XXX We could delay dropping the lock above but
* union_dircheckp complicates things.
*/
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
if ((vp->v_vflag & VV_ROOT) &&
(vp->v_mount->mnt_flag & MNT_UNION)) {
struct vnode *tvp = vp;
vp = vp->v_mount->mnt_vnodecovered;
VREF(vp);
fp->f_vnode = vp;
fp->f_data = vp;
fp->f_offset = 0;
vput(tvp);
goto unionread;
}
VOP_UNLOCK(vp, 0, td);
}
if (uap->basep != NULL) {
error = copyout(&loff, uap->basep, sizeof(long));
}
td->td_retval[0] = uap->count - auio.uio_resid;
fdrop(fp, td);
return (error);
}
#ifndef _SYS_SYSPROTO_H_
struct getdents_args {
int fd;
char *buf;
size_t count;
};
#endif
int
getdents(td, uap)
struct thread *td;
register struct getdents_args /* {
int fd;
char *buf;
u_int count;
} */ *uap;
{
struct getdirentries_args ap;
ap.fd = uap->fd;
ap.buf = uap->buf;
ap.count = uap->count;
ap.basep = NULL;
return (getdirentries(td, &ap));
}
/*
* Set the mode mask for creation of filesystem nodes.
*
* MP SAFE
*/
#ifndef _SYS_SYSPROTO_H_
struct umask_args {
int newmask;
};
#endif
int
umask(td, uap)
struct thread *td;
struct umask_args /* {
int newmask;
} */ *uap;
{
register struct filedesc *fdp;
FILEDESC_LOCK(td->td_proc->p_fd);
fdp = td->td_proc->p_fd;
td->td_retval[0] = fdp->fd_cmask;
fdp->fd_cmask = uap->newmask & ALLPERMS;
FILEDESC_UNLOCK(td->td_proc->p_fd);
return (0);
}
/*
* Void all references to file by ripping underlying filesystem
* away from vnode.
*/
#ifndef _SYS_SYSPROTO_H_
struct revoke_args {
char *path;
};
#endif
/* ARGSUSED */
int
revoke(td, uap)
struct thread *td;
register struct revoke_args /* {
char *path;
} */ *uap;
{
struct mount *mp;
struct vnode *vp;
struct vattr vattr;
int error;
struct nameidata nd;
NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, uap->path, td);
if ((error = namei(&nd)) != 0)
return (error);
vp = nd.ni_vp;
NDFREE(&nd, NDF_ONLY_PNBUF);
if (vp->v_type != VCHR) {
vput(vp);
return (EINVAL);
}
#ifdef MAC
error = mac_check_vnode_revoke(td->td_ucred, vp);
if (error) {
vput(vp);
return (error);
}
#endif
error = VOP_GETATTR(vp, &vattr, td->td_ucred, td);
if (error) {
vput(vp);
return (error);
}
VOP_UNLOCK(vp, 0, td);
if (td->td_ucred->cr_uid != vattr.va_uid) {
error = suser_cred(td->td_ucred, PRISON_ROOT);
if (error)
goto out;
}
if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0)
goto out;
if (vcount(vp) > 1)
VOP_REVOKE(vp, REVOKEALL);
vn_finished_write(mp);
out:
vrele(vp);
return (error);
}
/*
* Convert a user file descriptor to a kernel file entry.
* A reference on the file entry is held upon returning.
*/
int
getvnode(fdp, fd, fpp)
struct filedesc *fdp;
int fd;
struct file **fpp;
{
int error;
struct file *fp;
fp = NULL;
if (fdp == NULL)
error = EBADF;
else {
FILEDESC_LOCK(fdp);
if ((u_int)fd >= fdp->fd_nfiles ||
(fp = fdp->fd_ofiles[fd]) == NULL)
error = EBADF;
else if (fp->f_vnode == NULL) {
fp = NULL;
error = EINVAL;
} else {
fhold(fp);
error = 0;
}
FILEDESC_UNLOCK(fdp);
}
*fpp = fp;
return (error);
}
/*
* Get (NFS) file handle
*/
#ifndef _SYS_SYSPROTO_H_
struct getfh_args {
char *fname;
fhandle_t *fhp;
};
#endif
int
getfh(td, uap)
struct thread *td;
register struct getfh_args *uap;
{
struct nameidata nd;
fhandle_t fh;
register struct vnode *vp;
int error;
/*
* Must be super user
*/
error = suser(td);
if (error)
return (error);
NDINIT(&nd, LOOKUP, FOLLOW | 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);
}
/*
* 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.
*/
#ifndef _SYS_SYSPROTO_H_
struct fhopen_args {
const struct fhandle *u_fhp;
int flags;
};
#endif
int
fhopen(td, uap)
struct thread *td;
struct fhopen_args /* {
const struct fhandle *u_fhp;
int flags;
} */ *uap;
{
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;
register 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(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(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 (fmode & O_APPEND)
mode |= VAPPEND;
#ifdef MAC
error = mac_check_vnode_open(td->td_ucred, vp, mode);
if (error)
goto bad;
#endif
if (mode) {
error = VOP_ACCESS(vp, mode, td->td_ucred, td);
if (error)
goto bad;
}
if (fmode & O_TRUNC) {
VOP_UNLOCK(vp, 0, td); /* XXX */
if ((error = vn_start_write(NULL, &mp, V_WAIT | PCATCH)) != 0) {
vrele(vp);
return (error);
}
VOP_LEASE(vp, td, td->td_ucred, LEASE_WRITE);
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td); /* XXX */
#ifdef MAC
/*
* We don't yet have fp->f_cred, so use td->td_ucred, which
* should be right.
*/
error = mac_check_vnode_write(td->td_ucred, td->td_ucred, vp);
if (error == 0) {
#endif
VATTR_NULL(vap);
vap->va_size = 0;
error = VOP_SETATTR(vp, vap, td->td_ucred, td);
#ifdef MAC
}
#endif
vn_finished_write(mp);
if (error)
goto bad;
}
error = VOP_OPEN(vp, fmode, td->td_ucred, td, -1);
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, td->td_ucred)) != 0)
goto bad;
}
if (fmode & FWRITE)
vp->v_writecount++;
/*
* end of vn_open code
*/
if ((error = falloc(td, &nfp, &indx)) != 0) {
if (fmode & FWRITE)
vp->v_writecount--;
goto bad;
}
/* An extra reference on `nfp' has been held for us by falloc(). */
fp = nfp;
nfp->f_vnode = vp;
nfp->f_data = 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, 0, td);
if ((error = VOP_ADVLOCK(vp, (caddr_t)fp, F_SETLK, &lf,
type)) != 0) {
/*
* The 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.
*/
FILEDESC_LOCK(fdp);
if (fdp->fd_ofiles[indx] == fp) {
fdp->fd_ofiles[indx] = NULL;
fdunused(fdp, indx);
FILEDESC_UNLOCK(fdp);
fdrop(fp, td);
} else {
FILEDESC_UNLOCK(fdp);
}
/*
* release our private reference
*/
fdrop(fp, td);
return(error);
}
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
fp->f_flag |= FHASLOCK;
}
if ((vp->v_type == VREG) && (VOP_GETVOBJECT(vp, NULL) != 0))
vfs_object_create(vp, td, td->td_ucred);
VOP_UNLOCK(vp, 0, td);
fdrop(fp, td);
td->td_retval[0] = indx;
return (0);
bad:
vput(vp);
return (error);
}
/*
* Stat an (NFS) file handle.
*/
#ifndef _SYS_SYSPROTO_H_
struct fhstat_args {
struct fhandle *u_fhp;
struct stat *sb;
};
#endif
int
fhstat(td, uap)
struct thread *td;
register struct fhstat_args /* {
struct fhandle *u_fhp;
struct stat *sb;
} */ *uap;
{
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(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->td_ucred, NOCRED, td);
vput(vp);
if (error)
return (error);
error = copyout(&sb, uap->sb, sizeof(sb));
return (error);
}
/*
* Implement fstatfs() for (NFS) file handles.
*/
#ifndef _SYS_SYSPROTO_H_
struct fhstatfs_args {
struct fhandle *u_fhp;
struct statfs *buf;
};
#endif
int
fhstatfs(td, uap)
struct thread *td;
struct fhstatfs_args /* {
struct fhandle *u_fhp;
struct statfs *buf;
} */ *uap;
{
struct statfs *sp, sb;
struct mount *mp;
struct vnode *vp;
fhandle_t fh;
int error;
/*
* Must be super user
*/
error = suser(td);
if (error)
return (error);
if ((error = copyin(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);
#ifdef MAC
error = mac_check_mount_stat(td->td_ucred, mp);
if (error)
return (error);
#endif
/*
* Set these in case the underlying filesystem fails to do so.
*/
sp->f_version = STATFS_VERSION;
sp->f_namemax = NAME_MAX;
sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK;
if ((error = VFS_STATFS(mp, sp, td)) != 0)
return (error);
if (suser(td)) {
bcopy(sp, &sb, sizeof(sb));
sb.f_fsid.val[0] = sb.f_fsid.val[1] = 0;
sp = &sb;
}
return (copyout(sp, 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(td, uap)
struct thread *td;
struct extattrctl_args /* {
const char *path;
int cmd;
const char *filename;
int attrnamespace;
const char *attrname;
} */ *uap;
{
struct vnode *filename_vp;
struct nameidata nd;
struct mount *mp, *mp_writable;
char attrname[EXTATTR_MAXNAMELEN];
int error;
/*
* uap->attrname is not always defined. We check again later when we
* invoke the VFS call so as to pass in NULL there if needed.
*/
if (uap->attrname != NULL) {
error = copyinstr(uap->attrname, attrname, EXTATTR_MAXNAMELEN,
NULL);
if (error)
return (error);
}
/*
* uap->filename is not always defined. If it is, grab a vnode lock,
* which VFS_EXTATTRCTL() will later release.
*/
filename_vp = NULL;
if (uap->filename != NULL) {
NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE,
uap->filename, td);
error = namei(&nd);
if (error)
return (error);
filename_vp = nd.ni_vp;
NDFREE(&nd, NDF_NO_VP_RELE | NDF_NO_VP_UNLOCK);
}
/* uap->path is always defined. */
NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, uap->path, td);
error = namei(&nd);
if (error) {
if (filename_vp != NULL)
vput(filename_vp);
return (error);
}
mp = nd.ni_vp->v_mount;
error = vn_start_write(nd.ni_vp, &mp_writable, V_WAIT | PCATCH);
NDFREE(&nd, 0);
if (error) {
if (filename_vp != NULL)
vput(filename_vp);
return (error);
}
error = VFS_EXTATTRCTL(mp, uap->cmd, filename_vp, uap->attrnamespace,
uap->attrname != NULL ? attrname : NULL, td);
vn_finished_write(mp_writable);
/*
* VFS_EXTATTRCTL will have unlocked, but not de-ref'd,
* filename_vp, so vrele it if it is defined.
*/
if (filename_vp != NULL)
vrele(filename_vp);
return (error);
}
/*-
* Set a named extended attribute on a file or directory
*
* Arguments: unlocked vnode "vp", attribute namespace "attrnamespace",
* kernelspace string pointer "attrname", userspace buffer
* pointer "data", buffer length "nbytes", thread "td".
* Returns: 0 on success, an error number otherwise
* Locks: none
* References: vp must be a valid reference for the duration of the call
*/
static int
extattr_set_vp(struct vnode *vp, int attrnamespace, const char *attrname,
void *data, size_t nbytes, struct thread *td)
{
struct mount *mp;
struct uio auio;
struct iovec aiov;
ssize_t cnt;
int error;
error = vn_start_write(vp, &mp, V_WAIT | PCATCH);
if (error)
return (error);
VOP_LEASE(vp, td, td->td_ucred, LEASE_WRITE);
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
aiov.iov_base = data;
aiov.iov_len = nbytes;
auio.uio_iov = &aiov;
auio.uio_iovcnt = 1;
auio.uio_offset = 0;
if (nbytes > INT_MAX) {
error = EINVAL;
goto done;
}
auio.uio_resid = nbytes;
auio.uio_rw = UIO_WRITE;
auio.uio_segflg = UIO_USERSPACE;
auio.uio_td = td;
cnt = nbytes;
#ifdef MAC
error = mac_check_vnode_setextattr(td->td_ucred, vp, attrnamespace,
attrname, &auio);
if (error)
goto done;
#endif
error = VOP_SETEXTATTR(vp, attrnamespace, attrname, &auio,
td->td_ucred, td);
cnt -= auio.uio_resid;
td->td_retval[0] = cnt;
done:
VOP_UNLOCK(vp, 0, td);
vn_finished_write(mp);
return (error);
}
int
extattr_set_fd(td, uap)
struct thread *td;
struct extattr_set_fd_args /* {
int fd;
int attrnamespace;
const char *attrname;
void *data;
size_t nbytes;
} */ *uap;
{
struct file *fp;
char attrname[EXTATTR_MAXNAMELEN];
int error;
error = copyinstr(uap->attrname, attrname, EXTATTR_MAXNAMELEN, NULL);
if (error)
return (error);
error = getvnode(td->td_proc->p_fd, uap->fd, &fp);
if (error)
return (error);
error = extattr_set_vp(fp->f_vnode, uap->attrnamespace,
attrname, uap->data, uap->nbytes, td);
fdrop(fp, td);
return (error);
}
int
extattr_set_file(td, uap)
struct thread *td;
struct extattr_set_file_args /* {
const char *path;
int attrnamespace;
const char *attrname;
void *data;
size_t nbytes;
} */ *uap;
{
struct nameidata nd;
char attrname[EXTATTR_MAXNAMELEN];
int error;
error = copyinstr(uap->attrname, attrname, EXTATTR_MAXNAMELEN, NULL);
if (error)
return (error);
NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, uap->path, td);
error = namei(&nd);
if (error)
return (error);
NDFREE(&nd, NDF_ONLY_PNBUF);
error = extattr_set_vp(nd.ni_vp, uap->attrnamespace, attrname,
uap->data, uap->nbytes, td);
vrele(nd.ni_vp);
return (error);
}
int
extattr_set_link(td, uap)
struct thread *td;
struct extattr_set_link_args /* {
const char *path;
int attrnamespace;
const char *attrname;
void *data;
size_t nbytes;
} */ *uap;
{
struct nameidata nd;
char attrname[EXTATTR_MAXNAMELEN];
int error;
error = copyinstr(uap->attrname, attrname, EXTATTR_MAXNAMELEN, NULL);
if (error)
return (error);
NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, uap->path, td);
error = namei(&nd);
if (error)
return (error);
NDFREE(&nd, NDF_ONLY_PNBUF);
error = extattr_set_vp(nd.ni_vp, uap->attrnamespace, attrname,
uap->data, uap->nbytes, td);
vrele(nd.ni_vp);
return (error);
}
/*-
* Get a named extended attribute on a file or directory
*
* Arguments: unlocked vnode "vp", attribute namespace "attrnamespace",
* kernelspace string pointer "attrname", userspace buffer
* pointer "data", buffer length "nbytes", thread "td".
* Returns: 0 on success, an error number otherwise
* Locks: none
* References: vp must be a valid reference for the duration of the call
*/
static int
extattr_get_vp(struct vnode *vp, int attrnamespace, const char *attrname,
void *data, size_t nbytes, struct thread *td)
{
struct uio auio, *auiop;
struct iovec aiov;
ssize_t cnt;
size_t size, *sizep;
int error;
/*
* XXX: Temporary API compatibility for applications that know
* about this hack ("" means list), but haven't been updated
* for the extattr_list_*() system calls yet. This will go
* away for FreeBSD 5.3.
*/
if (strlen(attrname) == 0)
return (extattr_list_vp(vp, attrnamespace, data, nbytes, td));
VOP_LEASE(vp, td, td->td_ucred, LEASE_READ);
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
/*
* Slightly unusual semantics: if the user provides a NULL data
* pointer, they don't want to receive the data, just the
* maximum read length.
*/
auiop = NULL;
sizep = NULL;
cnt = 0;
if (data != NULL) {
aiov.iov_base = data;
aiov.iov_len = nbytes;
auio.uio_iov = &aiov;
auio.uio_offset = 0;
if (nbytes > INT_MAX) {
error = EINVAL;
goto done;
}
auio.uio_resid = nbytes;
auio.uio_rw = UIO_READ;
auio.uio_segflg = UIO_USERSPACE;
auio.uio_td = td;
auiop = &auio;
cnt = nbytes;
} else {
sizep = &size;
}
#ifdef MAC
error = mac_check_vnode_getextattr(td->td_ucred, vp, attrnamespace,
attrname, &auio);
if (error)
goto done;
#endif
error = VOP_GETEXTATTR(vp, attrnamespace, attrname, auiop, sizep,
td->td_ucred, td);
if (auiop != NULL) {
cnt -= auio.uio_resid;
td->td_retval[0] = cnt;
} else {
td->td_retval[0] = size;
}
done:
VOP_UNLOCK(vp, 0, td);
return (error);
}
int
extattr_get_fd(td, uap)
struct thread *td;
struct extattr_get_fd_args /* {
int fd;
int attrnamespace;
const char *attrname;
void *data;
size_t nbytes;
} */ *uap;
{
struct file *fp;
char attrname[EXTATTR_MAXNAMELEN];
int error;
error = copyinstr(uap->attrname, attrname, EXTATTR_MAXNAMELEN, NULL);
if (error)
return (error);
error = getvnode(td->td_proc->p_fd, uap->fd, &fp);
if (error)
return (error);
error = extattr_get_vp(fp->f_vnode, uap->attrnamespace,
attrname, uap->data, uap->nbytes, td);
fdrop(fp, td);
return (error);
}
int
extattr_get_file(td, uap)
struct thread *td;
struct extattr_get_file_args /* {
const char *path;
int attrnamespace;
const char *attrname;
void *data;
size_t nbytes;
} */ *uap;
{
struct nameidata nd;
char attrname[EXTATTR_MAXNAMELEN];
int error;
error = copyinstr(uap->attrname, attrname, EXTATTR_MAXNAMELEN, NULL);
if (error)
return (error);
NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, uap->path, td);
error = namei(&nd);
if (error)
return (error);
NDFREE(&nd, NDF_ONLY_PNBUF);
error = extattr_get_vp(nd.ni_vp, uap->attrnamespace, attrname,
uap->data, uap->nbytes, td);
vrele(nd.ni_vp);
return (error);
}
int
extattr_get_link(td, uap)
struct thread *td;
struct extattr_get_link_args /* {
const char *path;
int attrnamespace;
const char *attrname;
void *data;
size_t nbytes;
} */ *uap;
{
struct nameidata nd;
char attrname[EXTATTR_MAXNAMELEN];
int error;
error = copyinstr(uap->attrname, attrname, EXTATTR_MAXNAMELEN, NULL);
if (error)
return (error);
NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, uap->path, td);
error = namei(&nd);
if (error)
return (error);
NDFREE(&nd, NDF_ONLY_PNBUF);
error = extattr_get_vp(nd.ni_vp, uap->attrnamespace, attrname,
uap->data, uap->nbytes, td);
vrele(nd.ni_vp);
return (error);
}
/*
* extattr_delete_vp(): Delete a named extended attribute on a file or
* directory
*
* Arguments: unlocked vnode "vp", attribute namespace "attrnamespace",
* kernelspace string pointer "attrname", proc "p"
* Returns: 0 on success, an error number otherwise
* Locks: none
* References: vp must be a valid reference for the duration of the call
*/
static int
extattr_delete_vp(struct vnode *vp, int attrnamespace, const char *attrname,
struct thread *td)
{
struct mount *mp;
int error;
error = vn_start_write(vp, &mp, V_WAIT | PCATCH);
if (error)
return (error);
VOP_LEASE(vp, td, td->td_ucred, LEASE_WRITE);
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
#ifdef MAC
error = mac_check_vnode_deleteextattr(td->td_ucred, vp, attrnamespace,
attrname);
if (error)
goto done;
#endif
error = VOP_DELETEEXTATTR(vp, attrnamespace, attrname, td->td_ucred,
td);
if (error == EOPNOTSUPP)
error = VOP_SETEXTATTR(vp, attrnamespace, attrname, NULL,
td->td_ucred, td);
#ifdef MAC
done:
#endif
VOP_UNLOCK(vp, 0, td);
vn_finished_write(mp);
return (error);
}
int
extattr_delete_fd(td, uap)
struct thread *td;
struct extattr_delete_fd_args /* {
int fd;
int attrnamespace;
const char *attrname;
} */ *uap;
{
struct file *fp;
struct vnode *vp;
char attrname[EXTATTR_MAXNAMELEN];
int error;
error = copyinstr(uap->attrname, attrname, EXTATTR_MAXNAMELEN, NULL);
if (error)
return (error);
error = getvnode(td->td_proc->p_fd, uap->fd, &fp);
if (error)
return (error);
vp = fp->f_vnode;
error = extattr_delete_vp(vp, uap->attrnamespace, attrname, td);
fdrop(fp, td);
return (error);
}
int
extattr_delete_file(td, uap)
struct thread *td;
struct extattr_delete_file_args /* {
const char *path;
int attrnamespace;
const char *attrname;
} */ *uap;
{
struct nameidata nd;
char attrname[EXTATTR_MAXNAMELEN];
int error;
error = copyinstr(uap->attrname, attrname, EXTATTR_MAXNAMELEN, NULL);
if (error)
return(error);
NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, uap->path, td);
error = namei(&nd);
if (error)
return(error);
NDFREE(&nd, NDF_ONLY_PNBUF);
error = extattr_delete_vp(nd.ni_vp, uap->attrnamespace, attrname, td);
vrele(nd.ni_vp);
return(error);
}
int
extattr_delete_link(td, uap)
struct thread *td;
struct extattr_delete_link_args /* {
const char *path;
int attrnamespace;
const char *attrname;
} */ *uap;
{
struct nameidata nd;
char attrname[EXTATTR_MAXNAMELEN];
int error;
error = copyinstr(uap->attrname, attrname, EXTATTR_MAXNAMELEN, NULL);
if (error)
return(error);
NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, uap->path, td);
error = namei(&nd);
if (error)
return(error);
NDFREE(&nd, NDF_ONLY_PNBUF);
error = extattr_delete_vp(nd.ni_vp, uap->attrnamespace, attrname, td);
vrele(nd.ni_vp);
return(error);
}
/*-
* Retrieve a list of extended attributes on a file or directory.
*
* Arguments: unlocked vnode "vp", attribute namespace 'attrnamespace",
* userspace buffer pointer "data", buffer length "nbytes",
* thread "td".
* Returns: 0 on success, an error number otherwise
* Locks: none
* References: vp must be a valid reference for the duration of the call
*/
static int
extattr_list_vp(struct vnode *vp, int attrnamespace, void *data,
size_t nbytes, struct thread *td)
{
struct uio auio, *auiop;
size_t size, *sizep;
struct iovec aiov;
ssize_t cnt;
int error;
VOP_LEASE(vp, td, td->td_ucred, LEASE_READ);
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
auiop = NULL;
sizep = NULL;
cnt = 0;
if (data != NULL) {
aiov.iov_base = data;
aiov.iov_len = nbytes;
auio.uio_iov = &aiov;
auio.uio_offset = 0;
if (nbytes > INT_MAX) {
error = EINVAL;
goto done;
}
auio.uio_resid = nbytes;
auio.uio_rw = UIO_READ;
auio.uio_segflg = UIO_USERSPACE;
auio.uio_td = td;
auiop = &auio;
cnt = nbytes;
} else {
sizep = &size;
}
#ifdef MAC
error = mac_check_vnode_listextattr(td->td_ucred, vp, attrnamespace);
if (error)
goto done;
#endif
error = VOP_LISTEXTATTR(vp, attrnamespace, auiop, sizep,
td->td_ucred, td);
if (auiop != NULL) {
cnt -= auio.uio_resid;
td->td_retval[0] = cnt;
} else {
td->td_retval[0] = size;
}
done:
VOP_UNLOCK(vp, 0, td);
return (error);
}
int
extattr_list_fd(td, uap)
struct thread *td;
struct extattr_list_fd_args /* {
int fd;
int attrnamespace;
void *data;
size_t nbytes;
} */ *uap;
{
struct file *fp;
int error;
error = getvnode(td->td_proc->p_fd, uap->fd, &fp);
if (error)
return (error);
error = extattr_list_vp(fp->f_vnode, uap->attrnamespace, uap->data,
uap->nbytes, td);
fdrop(fp, td);
return (error);
}
int
extattr_list_file(td, uap)
struct thread*td;
struct extattr_list_file_args /* {
const char *path;
int attrnamespace;
void *data;
size_t nbytes;
} */ *uap;
{
struct nameidata nd;
int error;
NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, uap->path, td);
error = namei(&nd);
if (error)
return (error);
NDFREE(&nd, NDF_ONLY_PNBUF);
error = extattr_list_vp(nd.ni_vp, uap->attrnamespace, uap->data,
uap->nbytes, td);
vrele(nd.ni_vp);
return (error);
}
int
extattr_list_link(td, uap)
struct thread*td;
struct extattr_list_link_args /* {
const char *path;
int attrnamespace;
void *data;
size_t nbytes;
} */ *uap;
{
struct nameidata nd;
int error;
NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, uap->path, td);
error = namei(&nd);
if (error)
return (error);
NDFREE(&nd, NDF_ONLY_PNBUF);
error = extattr_list_vp(nd.ni_vp, uap->attrnamespace, uap->data,
uap->nbytes, td);
vrele(nd.ni_vp);
return (error);
}
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