ref: 440ccbc06007422f04943378260f250f9efa5331
dir: /sys/src/cmd/diff/test/diff-t9.2/
/* $OpenBSD: t9.2,v 1.2 2013/12/01 16:40:56 krw Exp $ */
/* $NetBSD: vfs_syscalls.c,v 1.71 1996/04/23 10:29:02 mycroft Exp $ */
/*
* Copyright (c) 1989, 1993
* The Regents of the University of California. All rights reserved.
* (c) UNIX System Laboratories, Inc.
* All or some portions of this file are derived from material licensed
* to the University of California by American Telephone and Telegraph
* Co. or Unix System Laboratories, Inc. and are reproduced herein with
* the permission of UNIX System Laboratories, Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)vfs_syscalls.c 8.28 (Berkeley) 12/10/94
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/namei.h>
#include <sys/filedesc.h>
#include <sys/kernel.h>
#include <sys/file.h>
#include <sys/stat.h>
#include <sys/vnode.h>
#include <sys/mount.h>
#include <sys/proc.h>
#include <sys/uio.h>
#include <sys/malloc.h>
#include <sys/dirent.h>
#include <sys/extattr.h>
#include <sys/syscallargs.h>
#include <uvm/uvm_extern.h>
#include <sys/sysctl.h>
extern int suid_clear;
int usermount = 0; /* sysctl: by default, users may not mount */
static int change_dir(struct nameidata *, struct proc *);
void checkdirs(struct vnode *);
/*
* Redirection info so we don't have to include the union fs routines in
* the kernel directly. This way, we can build unionfs as an LKM. The
* pointer gets filled in later, when we modload the LKM, or when the
* compiled-in unionfs code gets initialized. For now, we just set
* it to a stub routine.
*/
int (*union_check_p)(struct proc *, struct vnode **,
struct file *, struct uio, int *) = NULL;
/*
* Virtual File System System Calls
*/
/*
* Mount a file system.
*/
/* ARGSUSED */
int
sys_mount(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
register struct sys_mount_args /* {
syscallarg(char *) type;
syscallarg(char *) path;
syscallarg(int) flags;
syscallarg(void *) data;
} */ *uap = v;
register struct vnode *vp;
register struct mount *mp;
int error, flag = 0;
#ifdef COMPAT_43
u_long fstypenum = 0;
#endif
char fstypename[MFSNAMELEN];
char fspath[MNAMELEN];
struct vattr va;
struct nameidata nd;
struct vfsconf *vfsp;
struct timeval tv;
if (usermount == 0 && (error = suser(p->p_ucred, &p->p_acflag)))
return (error);
/*
* Mount points must fit in MNAMELEN, not MAXPATHLEN.
*/
error = copyinstr(SCARG(uap, path), fspath, MNAMELEN, NULL);
if (error)
return(error);
/*
* Get vnode to be covered
*/
NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, fspath, p);
if ((error = namei(&nd)) != 0)
return (error);
vp = nd.ni_vp;
if (SCARG(uap, flags) & MNT_UPDATE) {
if ((vp->v_flag & VROOT) == 0) {
vput(vp);
return (EINVAL);
}
mp = vp->v_mount;
flag = mp->mnt_flag;
/*
* We only allow the filesystem to be reloaded if it
* is currently mounted read-only.
*/
if ((SCARG(uap, flags) & MNT_RELOAD) &&
((mp->mnt_flag & MNT_RDONLY) == 0)) {
vput(vp);
return (EOPNOTSUPP); /* Needs translation */
}
mp->mnt_flag |=
SCARG(uap, flags) & (MNT_RELOAD | MNT_UPDATE);
/*
* Only root, or the user that did the original mount is
* permitted to update it.
*/
if (mp->mnt_stat.f_owner != p->p_ucred->cr_uid &&
(error = suser(p->p_ucred, &p->p_acflag))) {
vput(vp);
return (error);
}
/*
* Do not allow NFS export by non-root users. Silently
* enforce MNT_NOSUID and MNT_NODEV for non-root users.
*/
if (p->p_ucred->cr_uid != 0) {
if (SCARG(uap, flags) & MNT_EXPORTED) {
vput(vp);
return (EPERM);
}
SCARG(uap, flags) |= MNT_NOSUID | MNT_NODEV;
}
if ((error = vfs_busy(mp, LK_NOWAIT, 0, p)) != 0) {
vput(vp);
return (error);
}
VOP_UNLOCK(vp, 0, p);
goto update;
}
/*
* If the user is not root, ensure that they own the directory
* onto which we are attempting to mount.
*/
if ((error = VOP_GETATTR(vp, &va, p->p_ucred, p)) ||
(va.va_uid != p->p_ucred->cr_uid &&
(error = suser(p->p_ucred, &p->p_acflag)))) {
vput(vp);
return (error);
}
/*
* Do not allow NFS export by non-root users. Silently
* enforce MNT_NOSUID and MNT_NODEV for non-root users.
*/
if (p->p_ucred->cr_uid != 0) {
if (SCARG(uap, flags) & MNT_EXPORTED) {
vput(vp);
return (EPERM);
}
SCARG(uap, flags) |= MNT_NOSUID | MNT_NODEV;
}
if ((error = vinvalbuf(vp, V_SAVE, p->p_ucred, p, 0, 0)) != 0)
return (error);
if (vp->v_type != VDIR) {
vput(vp);
return (ENOTDIR);
}
error = copyinstr(SCARG(uap, type), fstypename, MFSNAMELEN, NULL);
if (error) {
#ifdef COMPAT_43
/*
* Historically filesystem types were identified by number.
* If we get an integer for the filesystem type instead of a
* string, we check to see if it matches one of the historic
* filesystem types.
*/
fstypenum = (u_long)SCARG(uap, type);
for (vfsp = vfsconf; vfsp; vfsp = vfsp->vfc_next)
if (vfsp->vfc_typenum == fstypenum)
break;
if (vfsp == NULL) {
vput(vp);
return (ENODEV);
}
strncpy(fstypename, vfsp->vfc_name, MFSNAMELEN);
#else
vput(vp);
return (error);
#endif
}
for (vfsp = vfsconf; vfsp; vfsp = vfsp->vfc_next) {
if (!strcmp(vfsp->vfc_name, fstypename))
break;
}
if (vfsp == NULL) {
vput(vp);
return (EOPNOTSUPP);
}
if (vp->v_mountedhere != NULL) {
vput(vp);
return (EBUSY);
}
/*
* Allocate and initialize the file system.
*/
mp = (struct mount *)malloc((u_long)sizeof(struct mount),
M_MOUNT, M_WAITOK);
bzero((char *)mp, (u_long)sizeof(struct mount));
lockinit(&mp->mnt_lock, PVFS, "vfslock", 0, 0);
/* This error never happens, but it makes auditing easier */
if ((error = vfs_busy(mp, LK_NOWAIT, 0, p)))
return (error);
mp->mnt_op = vfsp->vfc_vfsops;
mp->mnt_vfc = vfsp;
mp->mnt_flag |= (vfsp->vfc_flags & MNT_VISFLAGMASK);
strncpy(mp->mnt_stat.f_fstypename, vfsp->vfc_name, MFSNAMELEN);
mp->mnt_vnodecovered = vp;
mp->mnt_stat.f_owner = p->p_ucred->cr_uid;
update:
/*
* Set the mount level flags.
*/
if (SCARG(uap, flags) & MNT_RDONLY)
mp->mnt_flag |= MNT_RDONLY;
else if (mp->mnt_flag & MNT_RDONLY)
mp->mnt_flag |= MNT_WANTRDWR;
mp->mnt_flag &=~ (MNT_NOSUID | MNT_NOEXEC | MNT_NODEV |
MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | MNT_SOFTDEP |
MNT_NOATIME | MNT_FORCE);
mp->mnt_flag |= SCARG(uap, flags) & (MNT_NOSUID | MNT_NOEXEC |
MNT_NODEV | MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC |
MNT_SOFTDEP | MNT_NOATIME | MNT_FORCE);
/*
* Mount the filesystem.
*/
error = VFS_MOUNT(mp, SCARG(uap, path), SCARG(uap, data), &nd, p);
if (!error) {
microtime(&tv);
mp->mnt_stat.f_ctime = tv.tv_sec;
}
if (mp->mnt_flag & MNT_UPDATE) {
vrele(vp);
if (mp->mnt_flag & MNT_WANTRDWR)
mp->mnt_flag &= ~MNT_RDONLY;
mp->mnt_flag &=~
(MNT_UPDATE | MNT_RELOAD | MNT_FORCE | MNT_WANTRDWR);
if (error)
mp->mnt_flag = flag;
if ((mp->mnt_flag & MNT_RDONLY) == 0) {
if (mp->mnt_syncer == NULL)
error = vfs_allocate_syncvnode(mp);
} else {
if (mp->mnt_syncer != NULL)
vgone(mp->mnt_syncer);
mp->mnt_syncer = NULL;
}
vfs_unbusy(mp, p);
return (error);
}
vp->v_mountedhere = mp;
/*
* Put the new filesystem on the mount list after root.
*/
cache_purge(vp);
if (!error) {
vfsp->vfc_refcount++;
simple_lock(&mountlist_slock);
TAILQ_INSERT_TAIL(&mountlist, mp, mnt_list);
simple_unlock(&mountlist_slock);
checkdirs(vp);
VOP_UNLOCK(vp, 0, p);
if ((mp->mnt_flag & MNT_RDONLY) == 0)
error = vfs_allocate_syncvnode(mp);
vfs_unbusy(mp, p);
(void) VFS_STATFS(mp, &mp->mnt_stat, p);
if ((error = VFS_START(mp, 0, p)) != 0)
vrele(vp);
} else {
mp->mnt_vnodecovered->v_mountedhere = (struct mount *)0;
vfs_unbusy(mp, p);
free((caddr_t)mp, M_MOUNT);
vput(vp);
}
return (error);
}
/*
* Scan all active processes to see if any of them have a current
* or root directory onto which the new filesystem has just been
* mounted. If so, replace them with the new mount point.
*/
void
checkdirs(olddp)
struct vnode *olddp;
{
struct filedesc *fdp;
struct vnode *newdp;
struct proc *p;
if (olddp->v_usecount == 1)
return;
if (VFS_ROOT(olddp->v_mountedhere, &newdp))
panic("mount: lost mount");
for (p = LIST_FIRST(&allproc); p != 0; p = LIST_NEXT(p, p_list)) {
fdp = p->p_fd;
if (fdp->fd_cdir == olddp) {
vrele(fdp->fd_cdir);
VREF(newdp);
fdp->fd_cdir = newdp;
}
if (fdp->fd_rdir == olddp) {
vrele(fdp->fd_rdir);
VREF(newdp);
fdp->fd_rdir = newdp;
}
}
if (rootvnode == olddp) {
vrele(rootvnode);
VREF(newdp);
rootvnode = newdp;
}
vput(newdp);
}
/*
* Unmount a file system.
*
* Note: unmount takes a path to the vnode mounted on as argument,
* not special file (as before).
*/
/* ARGSUSED */
int
sys_unmount(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
register struct sys_unmount_args /* {
syscallarg(char *) path;
syscallarg(int) flags;
} */ *uap = v;
register struct vnode *vp;
struct mount *mp;
int error;
struct nameidata nd;
NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE,
SCARG(uap, path), p);
if ((error = namei(&nd)) != 0)
return (error);
vp = nd.ni_vp;
mp = vp->v_mount;
/*
* Only root, or the user that did the original mount is
* permitted to unmount this filesystem.
*/
if ((mp->mnt_stat.f_owner != p->p_ucred->cr_uid) &&
(error = suser(p->p_ucred, &p->p_acflag))) {
vput(vp);
return (error);
}
/*
* Don't allow unmounting the root file system.
*/
if (mp->mnt_flag & MNT_ROOTFS) {
vput(vp);
return (EINVAL);
}
/*
* Must be the root of the filesystem
*/
if ((vp->v_flag & VROOT) == 0) {
vput(vp);
return (EINVAL);
}
vput(vp);
if (vfs_busy(mp, LK_EXCLUSIVE, NULL, p))
return (EBUSY);
return (dounmount(mp, SCARG(uap, flags), p, vp));
}
/*
* Do the actual file system unmount.
*/
int
dounmount(struct mount *mp, int flags, struct proc *p, struct vnode *olddp)
{
struct vnode *coveredvp;
struct proc *p2;
int error;
int hadsyncer = 0;
mp->mnt_flag &=~ MNT_ASYNC;
cache_purgevfs(mp); /* remove cache entries for this file sys */
if (mp->mnt_syncer != NULL) {
hadsyncer = 1;
vgone(mp->mnt_syncer);
mp->mnt_syncer = NULL;
}
if (((mp->mnt_flag & MNT_RDONLY) ||
(error = VFS_SYNC(mp, MNT_WAIT, p->p_ucred, p)) == 0) ||
(flags & MNT_FORCE))
error = VFS_UNMOUNT(mp, flags, p);
simple_lock(&mountlist_slock);
if (error) {
if ((mp->mnt_flag & MNT_RDONLY) == 0 && hadsyncer)
(void) vfs_allocate_syncvnode(mp);
lockmgr(&mp->mnt_lock, LK_RELEASE | LK_INTERLOCK,
&mountlist_slock, p);
return (error);
}
TAILQ_REMOVE(&mountlist, mp, mnt_list);
if ((coveredvp = mp->mnt_vnodecovered) != NULLVP) {
if (olddp) {
/*
* Try to put processes back in a real directory
* after a forced unmount.
* XXX We're not holding a ref on olddp, which may
* change, so compare id numbers.
*/
LIST_FOREACH(p2, &allproc, p_list) {
struct filedesc *fdp = p2->p_fd;
if (fdp->fd_cdir &&
fdp->fd_cdir->v_id == olddp->v_id) {
vrele(fdp->fd_cdir);
vref(coveredvp);
fdp->fd_cdir = coveredvp;
}
if (fdp->fd_rdir &&
fdp->fd_rdir->v_id == olddp->v_id) {
vrele(fdp->fd_rdir);
vref(coveredvp);
fdp->fd_rdir = coveredvp;
}
}
}
coveredvp->v_mountedhere = NULL;
vrele(coveredvp);
}
mp->mnt_vfc->vfc_refcount--;
if (mp->mnt_vnodelist.lh_first != NULL)
panic("unmount: dangling vnode");
lockmgr(&mp->mnt_lock, LK_RELEASE | LK_INTERLOCK, &mountlist_slock, p);
free((caddr_t)mp, M_MOUNT);
return (0);
}
/*
* Sync each mounted filesystem.
*/
#ifdef DEBUG
int syncprt = 0;
struct ctldebug debug0 = { "syncprt", &syncprt };
#endif
/* ARGSUSED */
int
sys_sync(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
register struct mount *mp, *nmp;
int asyncflag;
simple_lock(&mountlist_slock);
TAILQ_FOREACH_REVERSE_SAFE(mp, &mountlist, mnt_list, nmp) {
if (vfs_busy(mp, LK_NOWAIT, &mountlist_slock, p))
continue;
if ((mp->mnt_flag & MNT_RDONLY) == 0) {
asyncflag = mp->mnt_flag & MNT_ASYNC;
mp->mnt_flag &= ~MNT_ASYNC;
uvm_vnp_sync(mp);
VFS_SYNC(mp, MNT_NOWAIT, p->p_ucred, p);
if (asyncflag)
mp->mnt_flag |= MNT_ASYNC;
}
simple_lock(&mountlist_slock);
vfs_unbusy(mp, p);
}
simple_unlock(&mountlist_slock);
#ifdef DEBUG
if (syncprt)
vfs_bufstats();
#endif /* DEBUG */
return (0);
}
/*
* Change filesystem quotas.
*/
/* ARGSUSED */
int
sys_quotactl(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
register struct sys_quotactl_args /* {
syscallarg(char *) path;
syscallarg(int) cmd;
syscallarg(int) uid;
syscallarg(caddr_t) arg;
} */ *uap = v;
register struct mount *mp;
int error;
struct nameidata nd;
NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p);
if ((error = namei(&nd)) != 0)
return (error);
mp = nd.ni_vp->v_mount;
vrele(nd.ni_vp);
return (VFS_QUOTACTL(mp, SCARG(uap, cmd), SCARG(uap, uid),
SCARG(uap, arg), p));
}
/*
* Get filesystem statistics.
*/
/* ARGSUSED */
int
sys_statfs(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
register struct sys_statfs_args /* {
syscallarg(char *) path;
syscallarg(struct statfs *) buf;
} */ *uap = v;
register struct mount *mp;
register struct statfs *sp;
int error;
struct nameidata nd;
struct statfs sb;
NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p);
if ((error = namei(&nd)) != 0)
return (error);
mp = nd.ni_vp->v_mount;
sp = &mp->mnt_stat;
vrele(nd.ni_vp);
if ((error = VFS_STATFS(mp, sp, p)) != 0)
return (error);
sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK;
#if notyet
if (mp->mnt_flag & MNT_SOFTDEP)
sp->f_eflags = STATFS_SOFTUPD;
#endif
/* Don't let non-root see filesystem id (for NFS security) */
if (suser(p->p_ucred, &p->p_acflag)) {
bcopy((caddr_t)sp, (caddr_t)&sb, sizeof(sb));
sb.f_fsid.val[0] = sb.f_fsid.val[1] = 0;
sp = &sb;
}
return (copyout((caddr_t)sp, (caddr_t)SCARG(uap, buf), sizeof(*sp)));
}
/*
* Get filesystem statistics.
*/
/* ARGSUSED */
int
sys_fstatfs(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
struct sys_fstatfs_args /* {
syscallarg(int) fd;
syscallarg(struct statfs *) buf;
} */ *uap = v;
struct file *fp;
struct mount *mp;
struct statfs *sp;
int error;
struct statfs sb;
if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0)
return (error);
mp = ((struct vnode *)fp->f_data)->v_mount;
sp = &mp->mnt_stat;
error = VFS_STATFS(mp, sp, p);
FRELE(fp);
if (error)
return (error);
sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK;
#if notyet
if (mp->mnt_flag & MNT_SOFTDEP)
sp->f_eflags = STATFS_SOFTUPD;
#endif
/* Don't let non-root see filesystem id (for NFS security) */
if (suser(p->p_ucred, &p->p_acflag)) {
bcopy((caddr_t)sp, (caddr_t)&sb, sizeof(sb));
sb.f_fsid.val[0] = sb.f_fsid.val[1] = 0;
sp = &sb;
}
return (copyout((caddr_t)sp, (caddr_t)SCARG(uap, buf), sizeof(*sp)));
}
/*
* Get statistics on all filesystems.
*/
int
sys_getfsstat(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
register struct sys_getfsstat_args /* {
syscallarg(struct statfs *) buf;
syscallarg(size_t) bufsize;
syscallarg(int) flags;
} */ *uap = v;
register struct mount *mp *nmp;
register struct statfs *sp;
struct statfs sb;
caddr_t sfsp;
size_t count, maxcount;
int error, flags = SCARG(uap, flags);
maxcount = SCARG(uap, bufsize) / sizeof(struct statfs);
sfsp = (caddr_t)SCARG(uap, buf);
count = 0;
simple_lock(&mountlist_slock);
TAILQ_FOREACH_REVERSE_SAFE(mp, &mountlist, mnt_list, nmp) {
if (vfs_busy(mp, LK_NOWAIT, &mountlist_slock, p))
continue;
if (sfsp && count < maxcount) {
sp = &mp->mnt_stat;
/* Refresh stats unless MNT_NOWAIT is specified */
if (flags != MNT_NOWAIT &&
flags != MNT_LAZY &&
(flags == MNT_WAIT ||
flags == 0) &&
(error = VFS_STATFS(mp, sp, p))) {
simple_lock(&mountlist_slock);
vfs_unbusy(mp, p);
continue;
}
sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK;
#if notyet
if (mp->mnt_flag & MNT_SOFTDEP)
sp->f_eflags = STATFS_SOFTUPD;
#endif
if (suser(p->p_ucred, &p->p_acflag)) {
bcopy((caddr_t)sp, (caddr_t)&sb, sizeof(sb));
sb.f_fsid.val[0] = sb.f_fsid.val[1] = 0;
sp = &sb;
}
error = copyout((caddr_t)sp, sfsp, sizeof(*sp));
if (error) {
vfs_unbusy(mp, p);
return (error);
}
sfsp += sizeof(*sp);
}
count++;
simple_lock(&mountlist_slock);
vfs_unbusy(mp, p);
}
simple_unlock(&mountlist_slock);
if (sfsp && count > maxcount)
*retval = maxcount;
else
*retval = count;
return (0);
}
/*
* Change current working directory to a given file descriptor.
*/
/* ARGSUSED */
int
sys_fchdir(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
struct sys_fchdir_args /* {
syscallarg(int) fd;
} */ *uap = v;
struct filedesc *fdp = p->p_fd;
struct vnode *vp, *tdp;
struct mount *mp;
struct file *fp;
int error;
if ((error = getvnode(fdp, SCARG(uap, fd), &fp)) != 0)
return (error);
vp = (struct vnode *)fp->f_data;
VREF(vp);
FRELE(fp);
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p);
if (vp->v_type != VDIR)
error = ENOTDIR;
else
error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p);
while (!error && (mp = vp->v_mountedhere) != NULL) {
if (vfs_busy(mp, 0, 0, p))
continue;
error = VFS_ROOT(mp, &tdp);
vfs_unbusy(mp, p);
if (error)
break;
vput(vp);
vp = tdp;
}
if (error) {
vput(vp);
return (error);
}
VOP_UNLOCK(vp, 0, p);
vrele(fdp->fd_cdir);
fdp->fd_cdir = vp;
return (0);
}
/*
* Change current working directory (``.'').
*/
/* ARGSUSED */
int
sys_chdir(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
struct sys_chdir_args /* {
syscallarg(char *) path;
} */ *uap = v;
register struct filedesc *fdp = p->p_fd;
int error;
struct nameidata nd;
NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE,
SCARG(uap, path), p);
if ((error = change_dir(&nd, p)) != 0)
return (error);
vrele(fdp->fd_cdir);
fdp->fd_cdir = nd.ni_vp;
return (0);
}
/*
* Change notion of root (``/'') directory.
*/
/* ARGSUSED */
int
sys_chroot(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
struct sys_chroot_args /* {
syscallarg(char *) path;
} */ *uap = v;
register struct filedesc *fdp = p->p_fd;
int error;
struct nameidata nd;
if ((error = suser(p->p_ucred, &p->p_acflag)) != 0)
return (error);
NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE,
SCARG(uap, path), p);
if ((error = change_dir(&nd, p)) != 0)
return (error);
if (fdp->fd_rdir != NULL) {
/*
* A chroot() done inside a changed root environment does
* an automatic chdir to avoid the out-of-tree experience.
*/
vrele(fdp->fd_rdir);
vrele(fdp->fd_cdir);
VREF(nd.ni_vp);
fdp->fd_cdir = nd.ni_vp;
}
fdp->fd_rdir = nd.ni_vp;
return (0);
}
/*
* Common routine for chroot and chdir.
*/
static int
change_dir(ndp, p)
register struct nameidata *ndp;
struct proc *p;
{
struct vnode *vp;
int error;
if ((error = namei(ndp)) != 0)
return (error);
vp = ndp->ni_vp;
if (vp->v_type != VDIR)
error = ENOTDIR;
else
error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p);
if (error)
vput(vp);
else
VOP_UNLOCK(vp, 0, p);
return (error);
}
/*
* Check permissions, allocate an open file structure,
* and call the device open routine if any.
*/
int
sys_open(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
struct sys_open_args /* {
syscallarg(char *) path;
syscallarg(int) flags;
syscallarg(int) mode;
} */ *uap = v;
struct filedesc *fdp = p->p_fd;
struct file *fp;
struct vnode *vp;
struct vattr vattr;
int flags, cmode;
int type, indx, error, localtrunc = 0;
struct flock lf;
struct nameidata nd;
if ((error = falloc(p, &fp, &indx)) != 0)
return (error);
flags = FFLAGS(SCARG(uap, flags));
cmode = ((SCARG(uap, mode) &~ fdp->fd_cmask) & ALLPERMS) &~ S_ISTXT;
NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p);
p->p_dupfd = -indx - 1; /* XXX check for fdopen */
if ((flags & O_TRUNC) && (flags & (O_EXLOCK | O_SHLOCK))) {
localtrunc = 1;
flags &= ~O_TRUNC; /* Must do truncate ourselves */
}
if ((error = vn_open(&nd, flags, cmode)) != 0) {
if ((error == ENODEV || error == ENXIO) &&
p->p_dupfd >= 0 && /* XXX from fdopen */
(error =
dupfdopen(fdp, indx, p->p_dupfd, flags, error)) == 0) {
closef(fp, p);
*retval = indx;
return (0);
}
if (error == ERESTART)
error = EINTR;
fdremove(fdp, indx);
closef(fp, p);
return (error);
}
p->p_dupfd = 0;
vp = nd.ni_vp;
fp->f_flag = flags & FMASK;
fp->f_type = DTYPE_VNODE;
fp->f_ops = &vnops;
fp->f_data = (caddr_t)vp;
if (flags & (O_EXLOCK | O_SHLOCK)) {
lf.l_whence = SEEK_SET;
lf.l_start = 0;
lf.l_len = 0;
if (flags & O_EXLOCK)
lf.l_type = F_WRLCK;
else
lf.l_type = F_RDLCK;
type = F_FLOCK;
if ((flags & FNONBLOCK) == 0)
type |= F_WAIT;
VOP_UNLOCK(vp, 0, p);
error = VOP_ADVLOCK(vp, (caddr_t)fp, F_SETLK, &lf, type);
if (error) {
/* closef will vn_close the file for us. */
fdremove(fdp, indx);
closef(fp, p);
return (error);
}
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p);
fp->f_flag |= FHASLOCK;
}
if (localtrunc) {
VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE);
if ((fp->f_flag & FWRITE) == 0)
error = EACCES;
else if (vp->v_mount->mnt_flag & MNT_RDONLY)
error = EROFS;
else if (vp->v_type == VDIR)
error = EISDIR;
else if ((error = vn_writechk(vp)) == 0) {
VATTR_NULL(&vattr);
vattr.va_size = 0;
error = VOP_SETATTR(vp, &vattr, fp->f_cred, p);
}
if (error) {
VOP_UNLOCK(vp, 0, p);
/* closef will close the file for us. */
fdremove(fdp, indx);
closef(fp, p);
return (error);
}
}
VOP_UNLOCK(vp, 0, p);
*retval = indx;
FILE_SET_MATURE(fp);
return (0);
}
/*
* Get file handle system call
*/
int
sys_getfh(p, v, retval)
struct proc *p;
register void *v;
register_t *retval;
{
register struct sys_getfh_args /* {
syscallarg(char *) fname;
syscallarg(fhandle_t *) fhp;
} */ *uap = v;
register struct vnode *vp;
fhandle_t fh;
int error;
struct nameidata nd;
/*
* Must be super user
*/
error = suser(p->p_ucred, &p->p_acflag);
if (error)
return (error);
NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE,
SCARG(uap, fname), p);
error = namei(&nd);
if (error)
return (error);
vp = nd.ni_vp;
bzero((caddr_t)&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((caddr_t)&fh, (caddr_t)SCARG(uap, fhp), sizeof (fh));
return (error);
}
/*
* Open a file given a file handle.
*
* Check permissions, allocate an open file structure,
* and call the device open routine if any.
*/
int
sys_fhopen(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
register struct sys_fhopen_args /* {
syscallarg(const fhandle_t *) fhp;
syscallarg(int) flags;
} */ *uap = v;
struct filedesc *fdp = p->p_fd;
struct file *fp;
struct vnode *vp = NULL;
struct mount *mp;
struct ucred *cred = p->p_ucred;
int flags;
int type, indx, error=0;
struct flock lf;
struct vattr va;
fhandle_t fh;
/*
* Must be super user
*/
if ((error = suser(p->p_ucred, &p->p_acflag)))
return (error);
flags = FFLAGS(SCARG(uap, flags));
if ((flags & (FREAD | FWRITE)) == 0)
return (EINVAL);
if ((flags & O_CREAT))
return (EINVAL);
if ((error = falloc(p, &fp, &indx)) != 0)
return (error);
if ((error = copyin(SCARG(uap, fhp), &fh, sizeof(fhandle_t))) != 0)
goto bad;
if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL) {
error = ESTALE;
goto bad;
}
if ((error = VFS_FHTOVP(mp, &fh.fh_fid, &vp)) != 0) {
vp = NULL; /* most likely unnecessary sanity for bad: */
goto bad;
}
/* Now do an effective vn_open */
if (vp->v_type == VSOCK) {
error = EOPNOTSUPP;
goto bad;
}
if (flags & FREAD) {
if ((error = VOP_ACCESS(vp, VREAD, cred, p)) != 0)
goto bad;
}
if (flags & (FWRITE | O_TRUNC)) {
if (vp->v_type == VDIR) {
error = EISDIR;
goto bad;
}
if ((error = vn_writechk(vp)) != 0 ||
(error = VOP_ACCESS(vp, VWRITE, cred, p)) != 0)
goto bad;
}
if (flags & O_TRUNC) {
VOP_UNLOCK(vp, 0, p); /* XXX */
VOP_LEASE(vp, p, cred, LEASE_WRITE);
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p); /* XXX */
VATTR_NULL(&va);
va.va_size = 0;
if ((error = VOP_SETATTR(vp, &va, cred, p)) != 0)
goto bad;
}
if ((error = VOP_OPEN(vp, flags, cred, p)) != 0)
goto bad;
if (flags & FWRITE)
vp->v_writecount++;
/* done with modified vn_open, now finish what sys_open does. */
fp->f_flag = flags & FMASK;
fp->f_type = DTYPE_VNODE;
fp->f_ops = &vnops;
fp->f_data = (caddr_t)vp;
if (flags & (O_EXLOCK | O_SHLOCK)) {
lf.l_whence = SEEK_SET;
lf.l_start = 0;
lf.l_len = 0;
if (flags & O_EXLOCK)
lf.l_type = F_WRLCK;
else
lf.l_type = F_RDLCK;
type = F_FLOCK;
if ((flags & FNONBLOCK) == 0)
type |= F_WAIT;
VOP_UNLOCK(vp, 0, p);
error = VOP_ADVLOCK(vp, (caddr_t)fp, F_SETLK, &lf, type);
if (error) {
/* closef will vn_close the file for us. */
fdremove(fdp, indx);
closef(fp, p);
return (error);
}
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p);
fp->f_flag |= FHASLOCK;
}
VOP_UNLOCK(vp, 0, p);
*retval = indx;
FILE_SET_MATURE(fp);
return (0);
bad:
fdremove(fdp, indx);
closef(fp, p);
if (vp != NULL)
vput(vp);
return (error);
}
/* ARGSUSED */
int
sys_fhstat(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
register struct sys_fhstat_args /* {
syscallarg(const fhandle_t *) fhp;
syscallarg(struct stat *) sb;
} */ *uap = v;
struct stat sb;
int error;
fhandle_t fh;
struct mount *mp;
struct vnode *vp;
/*
* Must be super user
*/
if ((error = suser(p->p_ucred, &p->p_acflag)))
return (error);
if ((error = copyin(SCARG(uap, fhp), &fh, sizeof(fhandle_t))) != 0)
return (error);
if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL)
return (ESTALE);
if ((error = VFS_FHTOVP(mp, &fh.fh_fid, &vp)))
return (error);
error = vn_stat(vp, &sb, p);
vput(vp);
if (error)
return (error);
error = copyout(&sb, SCARG(uap, sb), sizeof(sb));
return (error);
}
/* ARGSUSED */
int
sys_fhstatfs(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
register struct sys_fhstatfs_args /*
syscallarg(const fhandle_t *) fhp;
syscallarg(struct statfs *) buf;
} */ *uap = v;
struct statfs sp;
fhandle_t fh;
struct mount *mp;
struct vnode *vp;
int error;
/*
* Must be super user
*/
if ((error = suser(p->p_ucred, &p->p_acflag)))
return (error);
if ((error = copyin(SCARG(uap, fhp), &fh, sizeof(fhandle_t))) != 0)
return (error);
if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL)
return (ESTALE);
if ((error = VFS_FHTOVP(mp, &fh.fh_fid, &vp)))
return (error);
mp = vp->v_mount;
vput(vp);
if ((error = VFS_STATFS(mp, &sp, p)) != 0)
return (error);
sp.f_flags = mp->mnt_flag & MNT_VISFLAGMASK;
return (copyout(&sp, SCARG(uap, buf), sizeof(sp)));
}
/*
* Create a special file.
*/
/* ARGSUSED */
int
sys_mknod(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
register struct sys_mknod_args /* {
syscallarg(char *) path;
syscallarg(int) mode;
syscallarg(int) dev;
} */ *uap = v;
register struct vnode *vp;
struct vattr vattr;
int error;
int whiteout = 0;
struct nameidata nd;
if ((error = suser(p->p_ucred, &p->p_acflag)) != 0)
return (error);
if (p->p_fd->fd_rdir)
return (EINVAL);
NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p);
if ((error = namei(&nd)) != 0)
return (error);
vp = nd.ni_vp;
if (vp != NULL)
error = EEXIST;
else {
VATTR_NULL(&vattr);
vattr.va_mode = (SCARG(uap, mode) & ALLPERMS) &~ p->p_fd->fd_cmask;
vattr.va_rdev = SCARG(uap, dev);
whiteout = 0;
switch (SCARG(uap, mode) & S_IFMT) {
case S_IFMT: /* used by badsect to flag bad sectors */
vattr.va_type = VBAD;
break;
case S_IFCHR:
vattr.va_type = VCHR;
break;
case S_IFBLK:
vattr.va_type = VBLK;
break;
case S_IFWHT:
whiteout = 1;
break;
default:
error = EINVAL;
break;
}
}
if (!error) {
VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE);
if (whiteout) {
error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, CREATE);
if (error)
VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd);
vput(nd.ni_dvp);
} else {
error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp,
&nd.ni_cnd, &vattr);
}
} else {
VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd);
if (nd.ni_dvp == vp)
vrele(nd.ni_dvp);
else
vput(nd.ni_dvp);
if (vp)
vrele(vp);
}
return (error);
}
/*
* Create a named pipe.
*/
/* ARGSUSED */
int
sys_mkfifo(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
#ifndef FIFO
return (EOPNOTSUPP);
#else
register struct sys_mkfifo_args /* {
syscallarg(char *) path;
syscallarg(int) mode;
} */ *uap = v;
struct vattr vattr;
int error;
struct nameidata nd;
NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p);
if ((error = namei(&nd)) != 0)
return (error);
if (nd.ni_vp != NULL) {
VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd);
if (nd.ni_dvp == nd.ni_vp)
vrele(nd.ni_dvp);
else
vput(nd.ni_dvp);
vrele(nd.ni_vp);
return (EEXIST);
}
VATTR_NULL(&vattr);
vattr.va_type = VFIFO;
vattr.va_mode = (SCARG(uap, mode) & ALLPERMS) &~ p->p_fd->fd_cmask;
VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE);
return (VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr));
#endif /* FIFO */
}
/*
* Make a hard file link.
*/
/* ARGSUSED */
int
sys_link(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
register struct sys_link_args /* {
syscallarg(char *) path;
syscallarg(char *) link;
} */ *uap = v;
register struct vnode *vp;
struct nameidata nd;
int error;
int flags;
NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p);
if ((error = namei(&nd)) != 0)
return (error);
vp = nd.ni_vp;
flags = LOCKPARENT;
if (vp->v_type == VDIR) {
flags |= STRIPSLASHES;
}
NDINIT(&nd, CREATE, flags, UIO_USERSPACE, SCARG(uap, link), p);
if ((error = namei(&nd)) != 0)
goto out;
if (nd.ni_vp) {
VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd);
if (nd.ni_dvp == nd.ni_vp)
vrele(nd.ni_dvp);
else
vput(nd.ni_dvp);
vrele(nd.ni_vp);
error = EEXIST;
goto out;
}
VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE);
VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE);
error = VOP_LINK(nd.ni_dvp, vp, &nd.ni_cnd);
out:
vrele(vp);
return (error);
}
/*
* Make a symbolic link.
*/
/* ARGSUSED */
int
sys_symlink(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
register struct sys_symlink_args /* {
syscallarg(char *) path;
syscallarg(char *) link;
} */ *uap = v;
struct vattr vattr;
char *path;
int error;
struct nameidata nd;
MALLOC(path, char *, MAXPATHLEN, M_NAMEI, M_WAITOK);
error = copyinstr(SCARG(uap, path), path, MAXPATHLEN, NULL);
if (error)
goto out;
NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, link), p);
if ((error = namei(&nd)) != 0)
goto out;
if (nd.ni_vp) {
VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd);
if (nd.ni_dvp == nd.ni_vp)
vrele(nd.ni_dvp);
else
vput(nd.ni_dvp);
vrele(nd.ni_vp);
error = EEXIST;
goto out;
}
VATTR_NULL(&vattr);
vattr.va_mode = ACCESSPERMS &~ p->p_fd->fd_cmask;
VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE);
error = VOP_SYMLINK(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr, path);
out:
FREE(path, M_NAMEI);
return (error);
}
/*
* Delete a whiteout from the filesystem.
*/
/* ARGSUSED */
int
sys_undelete(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
register struct sys_undelete_args /* {
syscallarg(char *) path;
} */ *uap = v;
int error;
struct nameidata nd;
NDINIT(&nd, DELETE, LOCKPARENT|DOWHITEOUT, UIO_USERSPACE,
SCARG(uap, path), p);
error = namei(&nd);
if (error)
return (error);
if (nd.ni_vp != NULLVP || !(nd.ni_cnd.cn_flags & ISWHITEOUT)) {
VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd);
if (nd.ni_dvp == nd.ni_vp)
vrele(nd.ni_dvp);
else
vput(nd.ni_dvp);
if (nd.ni_vp)
vrele(nd.ni_vp);
return (EEXIST);
}
VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE);
if ((error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, DELETE)) != 0)
VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd);
vput(nd.ni_dvp);
return (error);
}
/*
* Delete a name from the filesystem.
*/
/* ARGSUSED */
int
sys_unlink(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
struct sys_unlink_args /* {
syscallarg(char *) path;
} */ *uap = v;
register struct vnode *vp;
int error;
struct nameidata nd;
NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF, UIO_USERSPACE,
SCARG(uap, path), p);
if ((error = namei(&nd)) != 0)
return (error);
vp = nd.ni_vp;
/*
* The root of a mounted filesystem cannot be deleted.
*/
if (vp->v_flag & VROOT) {
VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd);
if (nd.ni_dvp == vp)
vrele(nd.ni_dvp);
else
vput(nd.ni_dvp);
vput(vp);
error = EBUSY;
goto out;
}
(void)uvm_vnp_uncache(vp);
VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE);
VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE);
error = VOP_REMOVE(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd);
out:
return (error);
}
/*
* Reposition read/write file offset.
*/
int
sys_lseek(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
register struct sys_lseek_args /* {
syscallarg(int) fd;
syscallarg(int) pad;
syscallarg(off_t) offset;
syscallarg(int) whence;
} */ *uap = v;
struct ucred *cred = p->p_ucred;
register struct filedesc *fdp = p->p_fd;
register struct file *fp;
struct vattr vattr;
struct vnode *vp;
int error, special;
if ((fp = fd_getfile(fdp, SCARG(uap, fd))) == NULL)
return (EBADF);
if (fp->f_type != DTYPE_VNODE)
return (ESPIPE);
vp = (struct vnode *)fp->f_data;
if (vp->v_type == VFIFO)
return (ESPIPE);
if (vp->v_type == VCHR)
special = 1;
else
special = 0;
switch (SCARG(uap, whence)) {
case SEEK_CUR:
if (!special && fp->f_offset + SCARG(uap, offset) < 0)
return (EINVAL);
fp->f_offset += SCARG(uap, offset);
break;
case SEEK_END:
error = VOP_GETATTR((struct vnode *)fp->f_data, &vattr,
cred, p);
if (error)
return (error);
if (!special && (off_t)vattr.va_size + SCARG(uap, offset) < 0)
return (EINVAL);
fp->f_offset = SCARG(uap, offset) + vattr.va_size;
break;
case SEEK_SET:
if (!special && SCARG(uap, offset) < 0)
return (EINVAL);
fp->f_offset = SCARG(uap, offset);
break;
default:
return (EINVAL);
}
*(off_t *)retval = fp->f_offset;
return (0);
}
/*
* Check access permissions.
*/
int
sys_access(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
register struct sys_access_args /* {
syscallarg(char *) path;
syscallarg(int) flags;
} */ *uap = v;
register struct ucred *cred = p->p_ucred;
register struct vnode *vp;
int error, flags, t_gid, t_uid;
struct nameidata nd;
if (SCARG(uap, flags) & ~(R_OK | W_OK | X_OK))
return (EINVAL);
t_uid = cred->cr_uid;
t_gid = cred->cr_gid;
cred->cr_uid = p->p_cred->p_ruid;
cred->cr_gid = p->p_cred->p_rgid;
NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE,
SCARG(uap, path), p);
if ((error = namei(&nd)) != 0)
goto out1;
vp = nd.ni_vp;
/* Flags == 0 means only check for existence. */
if (SCARG(uap, flags)) {
flags = 0;
if (SCARG(uap, flags) & R_OK)
flags |= VREAD;
if (SCARG(uap, flags) & W_OK)
flags |= VWRITE;
if (SCARG(uap, flags) & X_OK)
flags |= VEXEC;
if ((flags & VWRITE) == 0 || (error = vn_writechk(vp)) == 0)
error = VOP_ACCESS(vp, flags, cred, p);
}
vput(vp);
out1:
cred->cr_uid = t_uid;
cred->cr_gid = t_gid;
return (error);
}
/*
* Get file status; this version follows links.
*/
/* ARGSUSED */
int
sys_stat(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
register struct sys_stat_args /* {
syscallarg(char *) path;
syscallarg(struct stat *) ub;
} */ *uap = v;
struct stat sb;
int error;
struct nameidata nd;
NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE,
SCARG(uap, path), p);
if ((error = namei(&nd)) != 0)
return (error);
error = vn_stat(nd.ni_vp, &sb, p);
vput(nd.ni_vp);
if (error)
return (error);
/* Don't let non-root see generation numbers (for NFS security) */
if (suser(p->p_ucred, &p->p_acflag))
sb.st_gen = 0;
error = copyout((caddr_t)&sb, (caddr_t)SCARG(uap, ub), sizeof (sb));
return (error);
}
/*
* Get file status; this version does not follow links.
*/
/* ARGSUSED */
int
sys_lstat(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
register struct sys_lstat_args /* {
syscallarg(char *) path;
syscallarg(struct stat *) ub;
} */ *uap = v;
struct stat sb;
int error;
struct nameidata nd;
NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF, UIO_USERSPACE,
SCARG(uap, path), p);
if ((error = namei(&nd)) != 0)
return (error);
error = vn_stat(nd.ni_vp, &sb, p);
vput(nd.ni_vp);
if (error)
return (error);
/* Don't let non-root see generation numbers (for NFS security) */
if (suser(p->p_ucred, &p->p_acflag))
sb.st_gen = 0;
error = copyout((caddr_t)&sb, (caddr_t)SCARG(uap, ub), sizeof (sb));
return (error);
}
/*
* Get configurable pathname variables.
*/
/* ARGSUSED */
int
sys_pathconf(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
register struct sys_pathconf_args /* {
syscallarg(char *) path;
syscallarg(int) name;
} */ *uap = v;
int error;
struct nameidata nd;
NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE,
SCARG(uap, path), p);
if ((error = namei(&nd)) != 0)
return (error);
error = VOP_PATHCONF(nd.ni_vp, SCARG(uap, name), retval);
vput(nd.ni_vp);
return (error);
}
/*
* Return target name of a symbolic link.
*/
/* ARGSUSED */
int
sys_readlink(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
register struct sys_readlink_args /* {
syscallarg(char *) path;
syscallarg(char *) buf;
syscallarg(size_t) count;
} */ *uap = v;
register struct vnode *vp;
struct iovec aiov;
struct uio auio;
int error;
struct nameidata nd;
NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF, UIO_USERSPACE,
SCARG(uap, path), p);
if ((error = namei(&nd)) != 0)
return (error);
vp = nd.ni_vp;
if (vp->v_type != VLNK)
error = EINVAL;
else {
aiov.iov_base = SCARG(uap, buf);
aiov.iov_len = SCARG(uap, count);
auio.uio_iov = &aiov;
auio.uio_iovcnt = 1;
auio.uio_offset = 0;
auio.uio_rw = UIO_READ;
auio.uio_segflg = UIO_USERSPACE;
auio.uio_procp = p;
auio.uio_resid = SCARG(uap, count);
error = VOP_READLINK(vp, &auio, p->p_ucred);
}
vput(vp);
*retval = SCARG(uap, count) - auio.uio_resid;
return (error);
}
/*
* Change flags of a file given a path name.
*/
/* ARGSUSED */
int
sys_chflags(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
register struct sys_chflags_args /* {
syscallarg(char *) path;
syscallarg(unsigned int) flags;
} */ *uap = v;
register struct vnode *vp;
struct vattr vattr;
int error;
struct nameidata nd;
NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p);
if ((error = namei(&nd)) != 0)
return (error);
vp = nd.ni_vp;
VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE);
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p);
if (vp->v_mount->mnt_flag & MNT_RDONLY)
error = EROFS;
else if (SCARG(uap, flags) == VNOVAL)
error = EINVAL;
else {
if (suser(p->p_ucred, &p->p_acflag)) {
if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0)
goto out;
if (vattr.va_type == VCHR || vattr.va_type == VBLK) {
error = EINVAL;
goto out;
}
}
VATTR_NULL(&vattr);
vattr.va_flags = SCARG(uap, flags);
error = VOP_SETATTR(vp, &vattr, p->p_ucred, p);
}
out:
vput(vp);
return (error);
}
/*
* Change flags of a file given a file descriptor.
*/
/* ARGSUSED */
int
sys_fchflags(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
struct sys_fchflags_args /* {
syscallarg(int) fd;
syscallarg(unsigned int) flags;
} */ *uap = v;
struct vattr vattr;
struct vnode *vp;
struct file *fp;
int error;
if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0)
return (error);
vp = (struct vnode *)fp->f_data;
VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE);
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p);
if (vp->v_mount->mnt_flag & MNT_RDONLY)
error = EROFS;
else if (SCARG(uap, flags) == VNOVAL)
error = EINVAL;
else {
if (suser(p->p_ucred, &p->p_acflag)) {
if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p))
!= 0)
goto out;
if (vattr.va_type == VCHR || vattr.va_type == VBLK) {
error = EINVAL;
goto out;
}
}
VATTR_NULL(&vattr);
vattr.va_flags = SCARG(uap, flags);
error = VOP_SETATTR(vp, &vattr, p->p_ucred, p);
}
out:
VOP_UNLOCK(vp, 0, p);
FRELE(fp);
return (error);
}
/*
* Change mode of a file given path name.
*/
/* ARGSUSED */
int
sys_chmod(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
register struct sys_chmod_args /* {
syscallarg(char *) path;
syscallarg(int) mode;
} */ *uap = v;
register struct vnode *vp;
struct vattr vattr;
int error;
struct nameidata nd;
if (SCARG(uap, mode) & ~(S_IFMT | ALLPERMS))
return (EINVAL);
NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p);
if ((error = namei(&nd)) != 0)
return (error);
vp = nd.ni_vp;
VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE);
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p);
if (vp->v_mount->mnt_flag & MNT_RDONLY)
error = EROFS;
else {
VATTR_NULL(&vattr);
vattr.va_mode = SCARG(uap, mode) & ALLPERMS;
error = VOP_SETATTR(vp, &vattr, p->p_ucred, p);
}
vput(vp);
return (error);
}
/*
* Change mode of a file given a file descriptor.
*/
/* ARGSUSED */
int
sys_fchmod(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
struct sys_fchmod_args /* {
syscallarg(int) fd;
syscallarg(int) mode;
} */ *uap = v;
struct vattr vattr;
struct vnode *vp;
struct file *fp;
int error;
if (SCARG(uap, mode) & ~(S_IFMT | ALLPERMS))
return (EINVAL);
if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0)
return (error);
vp = (struct vnode *)fp->f_data;
VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE);
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p);
if (vp->v_mount->mnt_flag & MNT_RDONLY)
error = EROFS;
else {
VATTR_NULL(&vattr);
vattr.va_mode = SCARG(uap, mode) & ALLPERMS;
error = VOP_SETATTR(vp, &vattr, p->p_ucred, p);
}
VOP_UNLOCK(vp, 0, p);
FRELE(fp);
return (error);
}
/*
* Set ownership given a path name.
*/
/* ARGSUSED */
int
sys_chown(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
register struct sys_chown_args /* {
syscallarg(char *) path;
syscallarg(int) uid;
syscallarg(int) gid;
} */ *uap = v;
register struct vnode *vp;
struct vattr vattr;
int error;
struct nameidata nd;
u_short mode;
NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p);
if ((error = namei(&nd)) != 0)
return (error);
vp = nd.ni_vp;
VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE);
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p);
if (vp->v_mount->mnt_flag & MNT_RDONLY)
error = EROFS;
else {
if ((SCARG(uap, uid) != -1 || SCARG(uap, gid) != -1) &&
(suser(p->p_ucred, &p->p_acflag) || suid_clear)) {
error = VOP_GETATTR(vp, &vattr, p->p_ucred, p);
if (error)
goto out;
mode = vattr.va_mode & ~(VSUID | VSGID);
if (mode == vattr.va_mode)
mode = VNOVAL;
}
else
mode = VNOVAL;
VATTR_NULL(&vattr);
vattr.va_uid = SCARG(uap, uid);
vattr.va_gid = SCARG(uap, gid);
vattr.va_mode = mode;
error = VOP_SETATTR(vp, &vattr, p->p_ucred, p);
}
out:
vput(vp);
return (error);
}
/*
* Set ownership given a path name, without following links.
*/
/* ARGSUSED */
int
sys_lchown(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
register struct sys_lchown_args /* {
syscallarg(char *) path;
syscallarg(int) uid;
syscallarg(int) gid;
} */ *uap = v;
register struct vnode *vp;
struct vattr vattr;
int error;
struct nameidata nd;
u_short mode;
NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p);
if ((error = namei(&nd)) != 0)
return (error);
vp = nd.ni_vp;
VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE);
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p);
if (vp->v_mount->mnt_flag & MNT_RDONLY)
error = EROFS;
else {
if ((SCARG(uap, uid) != -1 || SCARG(uap, gid) != -1) &&
(suser(p->p_ucred, &p->p_acflag) || suid_clear)) {
error = VOP_GETATTR(vp, &vattr, p->p_ucred, p);
if (error)
goto out;
mode = vattr.va_mode & ~(VSUID | VSGID);
if (mode == vattr.va_mode)
mode = VNOVAL;
}
else
mode = VNOVAL;
VATTR_NULL(&vattr);
vattr.va_uid = SCARG(uap, uid);
vattr.va_gid = SCARG(uap, gid);
vattr.va_mode = mode;
error = VOP_SETATTR(vp, &vattr, p->p_ucred, p);
}
out:
vput(vp);
return (error);
}
/*
* Set ownership given a file descriptor.
*/
/* ARGSUSED */
int
sys_fchown(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
struct sys_fchown_args /* {
syscallarg(int) fd;
syscallarg(int) uid;
syscallarg(int) gid;
} */ *uap = v;
struct vnode *vp;
struct vattr vattr;
int error;
struct file *fp;
u_short mode;
if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0)
return (error);
vp = (struct vnode *)fp->f_data;
VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE);
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p);
if (vp->v_mount->mnt_flag & MNT_RDONLY)
error = EROFS;
else {
if ((SCARG(uap, uid) != -1 || SCARG(uap, gid) != -1) &&
(suser(p->p_ucred, &p->p_acflag) || suid_clear)) {
error = VOP_GETATTR(vp, &vattr, p->p_ucred, p);
if (error)
goto out;
mode = vattr.va_mode & ~(VSUID | VSGID);
if (mode == vattr.va_mode)
mode = VNOVAL;
} else
mode = VNOVAL;
VATTR_NULL(&vattr);
vattr.va_uid = SCARG(uap, uid);
vattr.va_gid = SCARG(uap, gid);
vattr.va_mode = mode;
error = VOP_SETATTR(vp, &vattr, p->p_ucred, p);
}
out:
VOP_UNLOCK(vp, 0, p);
FRELE(fp);
return (error);
}
/*
* Set the access and modification times given a path name.
*/
/* ARGSUSED */
int
sys_utimes(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
register struct sys_utimes_args /* {
syscallarg(char *) path;
syscallarg(struct timeval *) tptr;
} */ *uap = v;
register struct vnode *vp;
struct timeval tv[2];
struct vattr vattr;
int error;
struct nameidata nd;
VATTR_NULL(&vattr);
if (SCARG(uap, tptr) == NULL) {
microtime(&tv[0]);
tv[1] = tv[0];
vattr.va_vaflags |= VA_UTIMES_NULL;
} else {
error = copyin((caddr_t)SCARG(uap, tptr), (caddr_t)tv,
sizeof (tv));
if (error)
return (error);
/* XXX workaround timeval matching the VFS constant VNOVAL */
if (tv[0].tv_sec == VNOVAL)
tv[0].tv_sec = VNOVAL - 1;
if (tv[1].tv_sec == VNOVAL)
tv[1].tv_sec = VNOVAL - 1;
}
NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p);
if ((error = namei(&nd)) != 0)
return (error);
vp = nd.ni_vp;
VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE);
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p);
if (vp->v_mount->mnt_flag & MNT_RDONLY)
error = EROFS;
else {
vattr.va_atime.tv_sec = tv[0].tv_sec;
vattr.va_atime.tv_nsec = tv[0].tv_usec * 1000;
vattr.va_mtime.tv_sec = tv[1].tv_sec;
vattr.va_mtime.tv_nsec = tv[1].tv_usec * 1000;
error = VOP_SETATTR(vp, &vattr, p->p_ucred, p);
}
vput(vp);
return (error);
}
/*
* Set the access and modification times given a file descriptor.
*/
/* ARGSUSED */
int
sys_futimes(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
register struct sys_futimes_args /* {
syscallarg(int) fd;
syscallarg(struct timeval *) tptr;
} */ *uap = v;
struct vnode *vp;
struct timeval tv[2];
struct vattr vattr;
int error;
struct file *fp;
VATTR_NULL(&vattr);
if (SCARG(uap, tptr) == NULL) {
microtime(&tv[0]);
tv[1] = tv[0];
vattr.va_vaflags |= VA_UTIMES_NULL;
} else {
error = copyin((caddr_t)SCARG(uap, tptr), (caddr_t)tv,
sizeof (tv));
if (error)
return (error);
/* XXX workaround timeval matching the VFS constant VNOVAL */
if (tv[0].tv_sec == VNOVAL)
tv[0].tv_sec = VNOVAL - 1;
if (tv[1].tv_sec == VNOVAL)
tv[1].tv_sec = VNOVAL - 1;
}
if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0)
return (error);
vp = (struct vnode *)fp->f_data;
VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE);
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p);
if (vp->v_mount->mnt_flag & MNT_RDONLY)
error = EROFS;
else {
vattr.va_atime.tv_sec = tv[0].tv_sec;
vattr.va_atime.tv_nsec = tv[0].tv_usec * 1000;
vattr.va_mtime.tv_sec = tv[1].tv_sec;
vattr.va_mtime.tv_nsec = tv[1].tv_usec * 1000;
error = VOP_SETATTR(vp, &vattr, p->p_ucred, p);
}
VOP_UNLOCK(vp, 0, p);
FRELE(fp);
return (error);
}
/*
* Truncate a file given its path name.
*/
/* ARGSUSED */
int
sys_truncate(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
register struct sys_truncate_args /* {
syscallarg(char *) path;
syscallarg(int) pad;
syscallarg(off_t) length;
} */ *uap = v;
register struct vnode *vp;
struct vattr vattr;
int error;
struct nameidata nd;
NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p);
if ((error = namei(&nd)) != 0)
return (error);
vp = nd.ni_vp;
VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE);
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p);
if (vp->v_type == VDIR)
error = EISDIR;
else if ((error = vn_writechk(vp)) == 0 &&
(error = VOP_ACCESS(vp, VWRITE, p->p_ucred, p)) == 0) {
VATTR_NULL(&vattr);
vattr.va_size = SCARG(uap, length);
error = VOP_SETATTR(vp, &vattr, p->p_ucred, p);
}
vput(vp);
return (error);
}
/*
* Truncate a file given a file descriptor.
*/
/* ARGSUSED */
int
sys_ftruncate(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
struct sys_ftruncate_args /* {
syscallarg(int) fd;
syscallarg(int) pad;
syscallarg(off_t) length;
} */ *uap = v;
struct vattr vattr;
struct vnode *vp;
struct file *fp;
int error;
if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0)
return (error);
if ((fp->f_flag & FWRITE) == 0) {
error = EINVAL;
goto bad;
}
vp = (struct vnode *)fp->f_data;
VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE);
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p);
if (vp->v_type == VDIR)
error = EISDIR;
else if ((error = vn_writechk(vp)) == 0) {
VATTR_NULL(&vattr);
vattr.va_size = SCARG(uap, length);
error = VOP_SETATTR(vp, &vattr, fp->f_cred, p);
}
VOP_UNLOCK(vp, 0, p);
bad:
FRELE(fp);
return (error);
}
/*
* Sync an open file.
*/
/* ARGSUSED */
int
sys_fsync(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
struct sys_fsync_args /* {
syscallarg(int) fd;
} */ *uap = v;
struct vnode *vp;
struct file *fp;
int error;
if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0)
return (error);
vp = (struct vnode *)fp->f_data;
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p);
error = VOP_FSYNC(vp, fp->f_cred, MNT_WAIT, p);
#ifdef FFS_SOFTUPDATES
if (error == 0 && vp->v_mount && (vp->v_mount->mnt_flag & MNT_SOFTDEP))
error = softdep_fsync(vp);
#endif
VOP_UNLOCK(vp, 0, p);
FRELE(fp);
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.
*/
/* ARGSUSED */
int
sys_rename(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
register struct sys_rename_args /* {
syscallarg(char *) from;
syscallarg(char *) to;
} */ *uap = v;
register struct vnode *tvp, *fvp, *tdvp;
struct nameidata fromnd, tond;
int error;
int flags;
NDINIT(&fromnd, DELETE, WANTPARENT | SAVESTART, UIO_USERSPACE,
SCARG(uap, from), p);
if ((error = namei(&fromnd)) != 0)
return (error);
fvp = fromnd.ni_vp;
flags = LOCKPARENT | LOCKLEAF | NOCACHE | SAVESTART;
/*
* rename("foo/", "bar/"); is OK
*/
if (fvp->v_type == VDIR)
flags |= STRIPSLASHES;
NDINIT(&tond, RENAME, flags,
UIO_USERSPACE, SCARG(uap, to), p);
if ((error = namei(&tond)) != 0) {
VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd);
vrele(fromnd.ni_dvp);
vrele(fvp);
goto out1;
}
tdvp = tond.ni_dvp;
tvp = tond.ni_vp;
if (tvp != NULL) {
if (fvp->v_type == VDIR && tvp->v_type != VDIR) {
error = ENOTDIR;
goto out;
} else if (fvp->v_type != VDIR && tvp->v_type == VDIR) {
error = EISDIR;
goto out;
}
}
if (fvp == tdvp)
error = EINVAL;
/*
* If source is the same as the destination (that is the
* same inode number)
*/
if (fvp == tvp)
error = -1;
out:
if (!error) {
VOP_LEASE(tdvp, p, p->p_ucred, LEASE_WRITE);
if (fromnd.ni_dvp != tdvp)
VOP_LEASE(fromnd.ni_dvp, p, p->p_ucred, LEASE_WRITE);
if (tvp) {
(void)uvm_vnp_uncache(tvp);
VOP_LEASE(tvp, p, p->p_ucred, LEASE_WRITE);
}
error = VOP_RENAME(fromnd.ni_dvp, fromnd.ni_vp, &fromnd.ni_cnd,
tond.ni_dvp, tond.ni_vp, &tond.ni_cnd);
} else {
VOP_ABORTOP(tond.ni_dvp, &tond.ni_cnd);
if (tdvp == tvp)
vrele(tdvp);
else
vput(tdvp);
if (tvp)
vput(tvp);
VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd);
vrele(fromnd.ni_dvp);
vrele(fvp);
}
vrele(tond.ni_startdir);
FREE(tond.ni_cnd.cn_pnbuf, M_NAMEI);
out1:
if (fromnd.ni_startdir)
vrele(fromnd.ni_startdir);
FREE(fromnd.ni_cnd.cn_pnbuf, M_NAMEI);
if (error == -1)
return (0);
return (error);
}
/*
* Make a directory file.
*/
/* ARGSUSED */
int
sys_mkdir(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
register struct sys_mkdir_args /* {
syscallarg(char *) path;
syscallarg(int) mode;
} */ *uap = v;
register struct vnode *vp;
struct vattr vattr;
int error;
struct nameidata nd;
NDINIT(&nd, CREATE, LOCKPARENT | STRIPSLASHES,
UIO_USERSPACE, SCARG(uap, path), p);
if ((error = namei(&nd)) != 0)
return (error);
vp = nd.ni_vp;
if (vp != NULL) {
VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd);
if (nd.ni_dvp == vp)
vrele(nd.ni_dvp);
else
vput(nd.ni_dvp);
vrele(vp);
return (EEXIST);
}
VATTR_NULL(&vattr);
vattr.va_type = VDIR;
vattr.va_mode = (SCARG(uap, mode) & ACCESSPERMS) &~ p->p_fd->fd_cmask;
VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE);
error = VOP_MKDIR(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr);
if (!error)
vput(nd.ni_vp);
return (error);
}
/*
* Remove a directory file.
*/
/* ARGSUSED */
int
sys_rmdir(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
struct sys_rmdir_args /* {
syscallarg(char *) path;
} */ *uap = v;
register struct vnode *vp;
int error;
struct nameidata nd;
NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF, UIO_USERSPACE,
SCARG(uap, path), p);
if ((error = namei(&nd)) != 0)
return (error);
vp = nd.ni_vp;
if (vp->v_type != VDIR) {
error = ENOTDIR;
goto out;
}
/*
* No rmdir "." please.
*/
if (nd.ni_dvp == vp) {
error = EBUSY;
goto out;
}
/*
* The root of a mounted filesystem cannot be deleted.
*/
if (vp->v_flag & VROOT)
error = EBUSY;
out:
if (!error) {
VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE);
VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE);
error = VOP_RMDIR(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd);
} else {
VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd);
if (nd.ni_dvp == vp)
vrele(nd.ni_dvp);
else
vput(nd.ni_dvp);
vput(vp);
}
return (error);
}
/*
* Read a block of directory entries in a file system independent format.
*/
int
sys_getdirentries(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
struct sys_getdirentries_args /* {
syscallarg(int) fd;
syscallarg(char *) buf;
syscallarg(int) count;
syscallarg(long *) basep;
} */ *uap = v;
struct vnode *vp;
struct file *fp;
struct uio auio;
struct iovec aiov;
long loff;
int error, eofflag;
if (SCARG(uap, count) < 0)
return EINVAL;
if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0)
return (error);
if ((fp->f_flag & FREAD) == 0) {
error = EBADF;
goto bad;
}
vp = (struct vnode *)fp->f_data;
unionread:
if (vp->v_type != VDIR) {
error = EINVAL;
goto bad;
}
aiov.iov_base = SCARG(uap, buf);
aiov.iov_len = SCARG(uap, count);
auio.uio_iov = &aiov;
auio.uio_iovcnt = 1;
auio.uio_rw = UIO_READ;
auio.uio_segflg = UIO_USERSPACE;
auio.uio_procp = p;
auio.uio_resid = SCARG(uap, count);
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p);
loff = auio.uio_offset = fp->f_offset;
error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag, 0, 0);
fp->f_offset = auio.uio_offset;
VOP_UNLOCK(vp, 0, p);
if (error)
goto bad;
if ((SCARG(uap, count) == auio.uio_resid) &&
union_check_p &&
(union_check_p(p, &vp, fp, auio, &error) != 0))
goto unionread;
if (error)
goto bad;
if ((SCARG(uap, count) == auio.uio_resid) &&
(vp->v_flag & VROOT) &&
(vp->v_mount->mnt_flag & MNT_UNION)) {
struct vnode *tvp = vp;
vp = vp->v_mount->mnt_vnodecovered;
VREF(vp);
fp->f_data = (caddr_t) vp;
fp->f_offset = 0;
vrele(tvp);
goto unionread;
}
error = copyout((caddr_t)&loff, (caddr_t)SCARG(uap, basep),
sizeof(long));
*retval = SCARG(uap, count) - auio.uio_resid;
bad:
FRELE(fp);
return (error);
}
/*
* Set the mode mask for creation of filesystem nodes.
*/
int
sys_umask(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
struct sys_umask_args /* {
syscallarg(int) newmask;
} */ *uap = v;
register struct filedesc *fdp;
fdp = p->p_fd;
*retval = fdp->fd_cmask;
fdp->fd_cmask = SCARG(uap, newmask) & ACCESSPERMS;
return (0);
}
/*
* Void all references to file by ripping underlying filesystem
* away from vnode.
*/
/* ARGSUSED */
int
sys_revoke(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
register struct sys_revoke_args /* {
syscallarg(char *) path;
} */ *uap = v;
register struct vnode *vp;
struct vattr vattr;
int error;
struct nameidata nd;
NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p);
if ((error = namei(&nd)) != 0)
return (error);
vp = nd.ni_vp;
if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0)
goto out;
if (p->p_ucred->cr_uid != vattr.va_uid &&
(error = suser(p->p_ucred, &p->p_acflag)))
goto out;
if (vp->v_usecount > 1 || (vp->v_flag & (VALIASED | VLAYER)))
VOP_REVOKE(vp, REVOKEALL);
out:
vrele(vp);
return (error);
}
/*
* Convert a user file descriptor to a kernel file entry.
*
* On return *fpp is FREF:ed.
*/
int
getvnode(fdp, fd, fpp)
struct filedesc *fdp;
struct file **fpp;
int fd;
{
struct file *fp;
if ((fp = fd_getfile(fdp, fd)) == NULL)
return (EBADF);
if (fp->f_type != DTYPE_VNODE)
return (EINVAL);
FREF(fp);
*fpp = fp;
return (0);
}
/*
* Positional read system call.
*/
int
sys_pread(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
struct sys_pread_args /* {
syscallarg(int) fd;
syscallarg(void *) buf;
syscallarg(size_t) nbyte;
syscallarg(int) pad;
syscallarg(off_t) offset;
} */ *uap = v;
struct filedesc *fdp = p->p_fd;
struct file *fp;
struct vnode *vp;
off_t offset;
int fd = SCARG(uap, fd);
if ((fp = fd_getfile(fdp, fd)) == NULL)
return (EBADF);
if ((fp->f_flag & FREAD) == 0)
return (EBADF);
vp = (struct vnode *)fp->f_data;
if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) {
return (ESPIPE);
}
offset = SCARG(uap, offset);
FREF(fp);
/* dofileread() will FRELE the descriptor for us */
return (dofileread(p, fd, fp, SCARG(uap, buf), SCARG(uap, nbyte),
&offset, retval));
}
/*
* Positional scatter read system call.
*/
int
sys_preadv(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
struct sys_preadv_args /* {
syscallarg(int) fd;
syscallarg(const struct iovec *) iovp;
syscallarg(int) iovcnt;
syscallarg(int) pad;
syscallarg(off_t) offset;
} */ *uap = v;
struct filedesc *fdp = p->p_fd;
struct file *fp;
struct vnode *vp;
off_t offset;
int fd = SCARG(uap, fd);
if ((fp = fd_getfile(fdp, fd)) == NULL)
return (EBADF);
if ((fp->f_flag & FREAD) == 0)
return (EBADF);
vp = (struct vnode *)fp->f_data;
if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) {
return (ESPIPE);
}
FREF(fp);
offset = SCARG(uap, offset);
/* dofilereadv() will FRELE the descriptor for us */
return (dofilereadv(p, fd, fp, SCARG(uap, iovp), SCARG(uap, iovcnt),
&offset, retval));
}
/*
* Positional write system call.
*/
int
sys_pwrite(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
struct sys_pwrite_args /* {
syscallarg(int) fd;
syscallarg(const void *) buf;
syscallarg(size_t) nbyte;
syscallarg(int) pad;
syscallarg(off_t) offset;
} */ *uap = v;
struct filedesc *fdp = p->p_fd;
struct file *fp;
struct vnode *vp;
off_t offset;
int fd = SCARG(uap, fd);
if ((fp = fd_getfile(fdp, fd)) == NULL)
return (EBADF);
if ((fp->f_flag & FWRITE) == 0)
return (EBADF);
vp = (struct vnode *)fp->f_data;
if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) {
return (ESPIPE);
}
FREF(fp);
offset = SCARG(uap, offset);
/* dofilewrite() will FRELE the descriptor for us */
return (dofilewrite(p, fd, fp, SCARG(uap, buf), SCARG(uap, nbyte),
&offset, retval));
}
/*
* Positional gather write system call.
*/
int
sys_pwritev(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
struct sys_pwritev_args /* {
syscallarg(int) fd;
syscallarg(const struct iovec *) iovp;
syscallarg(int) iovcnt;
syscallarg(int) pad;
syscallarg(off_t) offset;
} */ *uap = v;
struct filedesc *fdp = p->p_fd;
struct file *fp;
struct vnode *vp;
off_t offset;
int fd = SCARG(uap, fd);
if ((fp = fd_getfile(fdp, fd)) == NULL)
return (EBADF);
if ((fp->f_flag & FWRITE) == 0)
return (EBADF);
vp = (struct vnode *)fp->f_data;
if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) {
return (ESPIPE);
}
FREF(fp);
offset = SCARG(uap, offset);
/* dofilewritev() will FRELE the descriptor for us */
return (dofilewritev(p, fd, fp, SCARG(uap, iovp), SCARG(uap, iovcnt),
&offset, retval));
}
#ifdef UFS_EXTATTR
/*
* 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
sys_extattrctl(struct proc *p, void *v, register_t *reval)
{
struct sys_extattrctl_args /* {
syscallarg(const char *) path;
syscallarg(int) cmd;
syscallarg(const char *) filename;
syscallarg(int) attrnamespace;
syscallarg(const char *) attrname;
} */ *uap = v;
struct vnode *filename_vp;
struct nameidata nd;
struct mount *mp;
char attrname[EXTATTR_MAXNAMELEN];
int error;
/*
* SCARG(uap, attrname) not always defined. We check again later
* when we invoke the VFS call so as to pass in NULL there if needed.
*/
if (SCARG(uap, attrname) != NULL) {
error = copyinstr(SCARG(uap, attrname), attrname,
EXTATTR_MAXNAMELEN, NULL);
if (error)
return (error);
}
/*
* SCARG(uap, filename) not always defined. If it is, grab
* a vnode lock, which VFS_EXTATTRCTL() will later release.
*/
filename_vp = NULL;
if (SCARG(uap, filename) != NULL) {
NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE,
SCARG(uap, filename), p);
if ((error = namei(&nd)) != 0)
return (error);
filename_vp = nd.ni_vp;
}
/* SCARG(uap, path) always defined. */
NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p);
if ((error = namei(&nd)) != 0) {
if (filename_vp != NULL)
vput(filename_vp);
return (error);
}
mp = nd.ni_vp->v_mount;
if (error) {
if (filename_vp != NULL)
vput(filename_vp);
return (error);
}
if (SCARG(uap, attrname) != NULL) {
error = VFS_EXTATTRCTL(mp, SCARG(uap, cmd), filename_vp,
SCARG(uap, attrnamespace), attrname, p);
} else {
error = VFS_EXTATTRCTL(mp, SCARG(uap, cmd), filename_vp,
SCARG(uap, attrnamespace), NULL, p);
}
/*
* 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 proc *p, register_t *retval)
{
struct uio auio;
struct iovec aiov;
ssize_t cnt;
int error;
VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE);
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p);
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_procp = p;
cnt = nbytes;
error = VOP_SETEXTATTR(vp, attrnamespace, attrname, &auio,
p->p_ucred, p);
cnt -= auio.uio_resid;
retval[0] = cnt;
done:
VOP_UNLOCK(vp, 0, p);
return (error);
}
int
sys_extattr_set_file(struct proc *p, void *v, register_t *retval)
{
struct sys_extattr_set_file_args /* {
syscallarg(const char *) path;
syscallarg(int) attrnamespace;
syscallarg(const char *) attrname;
syscallarg(void *) data;
syscallarg(size_t) nbytes;
} */ *uap = v;
struct nameidata nd;
char attrname[EXTATTR_MAXNAMELEN];
int error;
error = copyinstr(SCARG(uap, attrname), attrname, EXTATTR_MAXNAMELEN,
NULL);
if (error)
return (error);
NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p);
if ((error = namei(&nd)) != 0)
return (error);
error = extattr_set_vp(nd.ni_vp, SCARG(uap, attrnamespace), attrname,
SCARG(uap, data), SCARG(uap, nbytes), p, retval);
vrele(nd.ni_vp);
return (error);
}
int
sys_extattr_set_fd(struct proc *p, void *v, register_t *retval)
{
struct sys_extattr_set_fd_args /* {
syscallarg(int) fd;
syscallarg(int) attrnamespace;
syscallarg(const char *) attrname;
syscallarg(struct iovec *) iovp;
syscallarg(int) iovcnt;
} */ *uap = v;
struct file *fp;
char attrname[EXTATTR_MAXNAMELEN];
int error;
error = copyinstr(SCARG(uap, attrname), attrname, EXTATTR_MAXNAMELEN,
NULL);
if (error)
return (error);
if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0)
return (error);
error = extattr_set_vp((struct vnode *)fp->f_data,
SCARG(uap, attrnamespace), attrname, SCARG(uap, data),
SCARG(uap, nbytes), p, retval);
FRELE(fp);
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 proc *p, register_t *retval)
{
struct uio auio;
struct iovec aiov;
ssize_t cnt;
size_t size;
int error;
VOP_LEASE(vp, p, p->p_ucred, LEASE_READ);
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p);
/*
* Slightly unusual semantics: if the user provides a NULL data
* pointer, they don't want to receive the data, just the
* maximum read length.
*/
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_procp = p;
cnt = nbytes;
error = VOP_GETEXTATTR(vp, attrnamespace, attrname, &auio,
NULL, p->p_ucred, p);
cnt -= auio.uio_resid;
retval[0] = cnt;
} else {
error = VOP_GETEXTATTR(vp, attrnamespace, attrname, NULL,
&size, p->p_ucred, p);
retval[0] = size;
}
done:
VOP_UNLOCK(vp, 0, p);
return (error);
}
int
sys_extattr_get_file(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
struct sys_extattr_get_file_args /* {
syscallarg(const char *) path;
syscallarg(int) attrnamespace;
syscallarg(const char *) attrname;
syscallarg(void *) data;
syscallarg(size_t) nbytes;
} */ *uap = v;
struct nameidata nd;
char attrname[EXTATTR_MAXNAMELEN];
int error;
error = copyinstr(SCARG(uap, attrname), attrname, EXTATTR_MAXNAMELEN,
NULL);
if (error)
return (error);
NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p);
if ((error = namei(&nd)) != 0)
return (error);
error = extattr_get_vp(nd.ni_vp, SCARG(uap, attrnamespace), attrname,
SCARG(uap, data), SCARG(uap, nbytes), p, retval);
vrele(nd.ni_vp);
return (error);
}
int
sys_extattr_get_fd(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
struct sys_extattr_get_fd_args /* {
syscallarg(int) fd;
syscallarg(int) attrnamespace;
syscallarg(const char *) attrname;
syscallarg(void *) data;
syscallarg(size_t) nbytes;
} */ *uap = v;
struct file *fp;
char attrname[EXTATTR_MAXNAMELEN];
int error;
error = copyinstr(SCARG(uap, attrname), attrname, EXTATTR_MAXNAMELEN,
NULL);
if (error)
return (error);
if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0)
return (error);
error = extattr_get_vp((struct vnode *)fp->f_data,
SCARG(uap, attrnamespace), attrname, SCARG(uap, data),
SCARG(uap, nbytes), p, retval);
FRELE(fp);
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 proc *p)
{
int error;
VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE);
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p);
error = VOP_SETEXTATTR(vp, attrnamespace, attrname, NULL,
p->p_ucred, p);
VOP_UNLOCK(vp, 0, p);
return (error);
}
int
sys_extattr_delete_file(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
struct sys_extattr_delete_file_args /* {
syscallarg(int) fd;
syscallarg(int) attrnamespace;
syscallarg(const char *) attrname;
} */ *uap = v;
struct nameidata nd;
char attrname[EXTATTR_MAXNAMELEN];
int error;
error = copyinstr(SCARG(uap, attrname), attrname, EXTATTR_MAXNAMELEN,
NULL);
if (error)
return(error);
NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p);
if ((error = namei(&nd)) != 0)
return(error);
error = extattr_delete_vp(nd.ni_vp, SCARG(uap, attrnamespace),
attrname, p);
vrele(nd.ni_vp);
return(error);
}
int
sys_extattr_delete_fd(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
struct sys_extattr_delete_fd_args /* {
syscallarg(int) fd;
syscallarg(int) attrnamespace;
syscallarg(const char *) attrname;
} */ *uap = v;
struct file *fp;
char attrname[EXTATTR_MAXNAMELEN];
int error;
error = copyinstr(SCARG(uap, attrname), attrname, EXTATTR_MAXNAMELEN,
NULL);
if (error)
return (error);
if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0)
return (error);
error = extattr_delete_vp((struct vnode *)fp->f_data,
SCARG(uap, attrnamespace), attrname, p);
FRELE(fp);
return (error);
}
#endif