953 lines
22 KiB
C
953 lines
22 KiB
C
/* $NetBSD: vfs_vnops.c,v 1.186 2012/11/12 11:00:07 hannken Exp $ */
|
|
|
|
/*-
|
|
* Copyright (c) 2009 The NetBSD Foundation, Inc.
|
|
* All rights reserved.
|
|
*
|
|
* This code is derived from software contributed to The NetBSD Foundation
|
|
* by Andrew Doran.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
|
|
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
|
|
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
|
|
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
|
|
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
|
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
|
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
|
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
|
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
|
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
* POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
/*
|
|
* Copyright (c) 1982, 1986, 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_vnops.c 8.14 (Berkeley) 6/15/95
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
__KERNEL_RCSID(0, "$NetBSD: vfs_vnops.c,v 1.186 2012/11/12 11:00:07 hannken Exp $");
|
|
|
|
#include "veriexec.h"
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/file.h>
|
|
#include <sys/stat.h>
|
|
#include <sys/buf.h>
|
|
#include <sys/proc.h>
|
|
#include <sys/mount.h>
|
|
#include <sys/namei.h>
|
|
#include <sys/vnode.h>
|
|
#include <sys/ioctl.h>
|
|
#include <sys/tty.h>
|
|
#include <sys/poll.h>
|
|
#include <sys/kauth.h>
|
|
#include <sys/syslog.h>
|
|
#include <sys/fstrans.h>
|
|
#include <sys/atomic.h>
|
|
#include <sys/filedesc.h>
|
|
#include <sys/wapbl.h>
|
|
|
|
#include <miscfs/specfs/specdev.h>
|
|
#include <miscfs/fifofs/fifo.h>
|
|
|
|
#include <uvm/uvm_extern.h>
|
|
#include <uvm/uvm_readahead.h>
|
|
|
|
#ifdef UNION
|
|
#include <fs/union/union.h>
|
|
#endif
|
|
|
|
int (*vn_union_readdir_hook) (struct vnode **, struct file *, struct lwp *);
|
|
|
|
#include <sys/verified_exec.h>
|
|
|
|
static int vn_read(file_t *fp, off_t *offset, struct uio *uio,
|
|
kauth_cred_t cred, int flags);
|
|
static int vn_write(file_t *fp, off_t *offset, struct uio *uio,
|
|
kauth_cred_t cred, int flags);
|
|
static int vn_closefile(file_t *fp);
|
|
static int vn_poll(file_t *fp, int events);
|
|
static int vn_fcntl(file_t *fp, u_int com, void *data);
|
|
static int vn_statfile(file_t *fp, struct stat *sb);
|
|
static int vn_ioctl(file_t *fp, u_long com, void *data);
|
|
|
|
const struct fileops vnops = {
|
|
.fo_read = vn_read,
|
|
.fo_write = vn_write,
|
|
.fo_ioctl = vn_ioctl,
|
|
.fo_fcntl = vn_fcntl,
|
|
.fo_poll = vn_poll,
|
|
.fo_stat = vn_statfile,
|
|
.fo_close = vn_closefile,
|
|
.fo_kqfilter = vn_kqfilter,
|
|
.fo_restart = fnullop_restart,
|
|
};
|
|
|
|
/*
|
|
* Common code for vnode open operations.
|
|
* Check permissions, and call the VOP_OPEN or VOP_CREATE routine.
|
|
*/
|
|
int
|
|
vn_open(struct nameidata *ndp, int fmode, int cmode)
|
|
{
|
|
struct vnode *vp;
|
|
struct lwp *l = curlwp;
|
|
kauth_cred_t cred = l->l_cred;
|
|
struct vattr va;
|
|
int error;
|
|
const char *pathstring;
|
|
|
|
if ((fmode & (O_CREAT | O_DIRECTORY)) == (O_CREAT | O_DIRECTORY))
|
|
return EINVAL;
|
|
|
|
ndp->ni_cnd.cn_flags &= TRYEMULROOT | NOCHROOT;
|
|
|
|
if (fmode & O_CREAT) {
|
|
ndp->ni_cnd.cn_nameiop = CREATE;
|
|
ndp->ni_cnd.cn_flags |= LOCKPARENT | LOCKLEAF;
|
|
if ((fmode & O_EXCL) == 0 &&
|
|
((fmode & O_NOFOLLOW) == 0))
|
|
ndp->ni_cnd.cn_flags |= FOLLOW;
|
|
} else {
|
|
ndp->ni_cnd.cn_nameiop = LOOKUP;
|
|
ndp->ni_cnd.cn_flags |= LOCKLEAF;
|
|
if ((fmode & O_NOFOLLOW) == 0)
|
|
ndp->ni_cnd.cn_flags |= FOLLOW;
|
|
}
|
|
|
|
pathstring = pathbuf_stringcopy_get(ndp->ni_pathbuf);
|
|
if (pathstring == NULL) {
|
|
return ENOMEM;
|
|
}
|
|
|
|
error = namei(ndp);
|
|
if (error)
|
|
goto out;
|
|
|
|
vp = ndp->ni_vp;
|
|
|
|
#if NVERIEXEC > 0
|
|
error = veriexec_openchk(l, ndp->ni_vp, pathstring, fmode);
|
|
if (error)
|
|
goto bad;
|
|
#endif /* NVERIEXEC > 0 */
|
|
|
|
if (fmode & O_CREAT) {
|
|
if (ndp->ni_vp == NULL) {
|
|
vattr_null(&va);
|
|
va.va_type = VREG;
|
|
va.va_mode = cmode;
|
|
if (fmode & O_EXCL)
|
|
va.va_vaflags |= VA_EXCLUSIVE;
|
|
error = VOP_CREATE(ndp->ni_dvp, &ndp->ni_vp,
|
|
&ndp->ni_cnd, &va);
|
|
if (error)
|
|
goto out;
|
|
fmode &= ~O_TRUNC;
|
|
vp = ndp->ni_vp;
|
|
} else {
|
|
VOP_ABORTOP(ndp->ni_dvp, &ndp->ni_cnd);
|
|
if (ndp->ni_dvp == ndp->ni_vp)
|
|
vrele(ndp->ni_dvp);
|
|
else
|
|
vput(ndp->ni_dvp);
|
|
ndp->ni_dvp = NULL;
|
|
vp = ndp->ni_vp;
|
|
if (fmode & O_EXCL) {
|
|
error = EEXIST;
|
|
goto bad;
|
|
}
|
|
fmode &= ~O_CREAT;
|
|
}
|
|
} else {
|
|
vp = ndp->ni_vp;
|
|
}
|
|
if (vp->v_type == VSOCK) {
|
|
error = EOPNOTSUPP;
|
|
goto bad;
|
|
}
|
|
if (ndp->ni_vp->v_type == VLNK) {
|
|
error = EFTYPE;
|
|
goto bad;
|
|
}
|
|
|
|
if ((fmode & O_CREAT) == 0) {
|
|
error = vn_openchk(vp, cred, fmode);
|
|
if (error != 0)
|
|
goto bad;
|
|
}
|
|
|
|
if (fmode & O_TRUNC) {
|
|
vattr_null(&va);
|
|
va.va_size = 0;
|
|
error = VOP_SETATTR(vp, &va, cred);
|
|
if (error != 0)
|
|
goto bad;
|
|
}
|
|
if ((error = VOP_OPEN(vp, fmode, cred)) != 0)
|
|
goto bad;
|
|
if (fmode & FWRITE) {
|
|
mutex_enter(vp->v_interlock);
|
|
vp->v_writecount++;
|
|
mutex_exit(vp->v_interlock);
|
|
}
|
|
|
|
bad:
|
|
if (error)
|
|
vput(vp);
|
|
out:
|
|
pathbuf_stringcopy_put(ndp->ni_pathbuf, pathstring);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Check for write permissions on the specified vnode.
|
|
* Prototype text segments cannot be written.
|
|
*/
|
|
int
|
|
vn_writechk(struct vnode *vp)
|
|
{
|
|
|
|
/*
|
|
* If the vnode is in use as a process's text,
|
|
* we can't allow writing.
|
|
*/
|
|
if (vp->v_iflag & VI_TEXT)
|
|
return (ETXTBSY);
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
vn_openchk(struct vnode *vp, kauth_cred_t cred, int fflags)
|
|
{
|
|
int permbits = 0;
|
|
int error;
|
|
|
|
if ((fflags & O_DIRECTORY) != 0 && vp->v_type != VDIR)
|
|
return ENOTDIR;
|
|
|
|
if ((fflags & FREAD) != 0) {
|
|
permbits = VREAD;
|
|
}
|
|
if ((fflags & (FWRITE | O_TRUNC)) != 0) {
|
|
permbits |= VWRITE;
|
|
if (vp->v_type == VDIR) {
|
|
error = EISDIR;
|
|
goto bad;
|
|
}
|
|
error = vn_writechk(vp);
|
|
if (error != 0)
|
|
goto bad;
|
|
}
|
|
error = VOP_ACCESS(vp, permbits, cred);
|
|
bad:
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Mark a vnode as having executable mappings.
|
|
*/
|
|
void
|
|
vn_markexec(struct vnode *vp)
|
|
{
|
|
|
|
if ((vp->v_iflag & VI_EXECMAP) != 0) {
|
|
/* Safe unlocked, as long as caller holds a reference. */
|
|
return;
|
|
}
|
|
|
|
mutex_enter(vp->v_interlock);
|
|
if ((vp->v_iflag & VI_EXECMAP) == 0) {
|
|
atomic_add_int(&uvmexp.filepages, -vp->v_uobj.uo_npages);
|
|
atomic_add_int(&uvmexp.execpages, vp->v_uobj.uo_npages);
|
|
vp->v_iflag |= VI_EXECMAP;
|
|
}
|
|
mutex_exit(vp->v_interlock);
|
|
}
|
|
|
|
/*
|
|
* Mark a vnode as being the text of a process.
|
|
* Fail if the vnode is currently writable.
|
|
*/
|
|
int
|
|
vn_marktext(struct vnode *vp)
|
|
{
|
|
|
|
if ((vp->v_iflag & (VI_TEXT|VI_EXECMAP)) == (VI_TEXT|VI_EXECMAP)) {
|
|
/* Safe unlocked, as long as caller holds a reference. */
|
|
return (0);
|
|
}
|
|
|
|
mutex_enter(vp->v_interlock);
|
|
if (vp->v_writecount != 0) {
|
|
KASSERT((vp->v_iflag & VI_TEXT) == 0);
|
|
mutex_exit(vp->v_interlock);
|
|
return (ETXTBSY);
|
|
}
|
|
if ((vp->v_iflag & VI_EXECMAP) == 0) {
|
|
atomic_add_int(&uvmexp.filepages, -vp->v_uobj.uo_npages);
|
|
atomic_add_int(&uvmexp.execpages, vp->v_uobj.uo_npages);
|
|
}
|
|
vp->v_iflag |= (VI_TEXT | VI_EXECMAP);
|
|
mutex_exit(vp->v_interlock);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Vnode close call
|
|
*
|
|
* Note: takes an unlocked vnode, while VOP_CLOSE takes a locked node.
|
|
*/
|
|
int
|
|
vn_close(struct vnode *vp, int flags, kauth_cred_t cred)
|
|
{
|
|
int error;
|
|
|
|
if (flags & FWRITE) {
|
|
mutex_enter(vp->v_interlock);
|
|
KASSERT(vp->v_writecount > 0);
|
|
vp->v_writecount--;
|
|
mutex_exit(vp->v_interlock);
|
|
}
|
|
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
|
|
error = VOP_CLOSE(vp, flags, cred);
|
|
vput(vp);
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
enforce_rlimit_fsize(struct vnode *vp, struct uio *uio, int ioflag)
|
|
{
|
|
struct lwp *l = curlwp;
|
|
off_t testoff;
|
|
|
|
if (uio->uio_rw != UIO_WRITE || vp->v_type != VREG)
|
|
return 0;
|
|
|
|
KASSERT(VOP_ISLOCKED(vp) == LK_EXCLUSIVE);
|
|
if (ioflag & IO_APPEND)
|
|
testoff = vp->v_size;
|
|
else
|
|
testoff = uio->uio_offset;
|
|
|
|
if (testoff + uio->uio_resid >
|
|
l->l_proc->p_rlimit[RLIMIT_FSIZE].rlim_cur) {
|
|
mutex_enter(proc_lock);
|
|
psignal(l->l_proc, SIGXFSZ);
|
|
mutex_exit(proc_lock);
|
|
return EFBIG;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Package up an I/O request on a vnode into a uio and do it.
|
|
*/
|
|
int
|
|
vn_rdwr(enum uio_rw rw, struct vnode *vp, void *base, int len, off_t offset,
|
|
enum uio_seg segflg, int ioflg, kauth_cred_t cred, size_t *aresid,
|
|
struct lwp *l)
|
|
{
|
|
struct uio auio;
|
|
struct iovec aiov;
|
|
int error;
|
|
|
|
if ((ioflg & IO_NODELOCKED) == 0) {
|
|
if (rw == UIO_READ) {
|
|
vn_lock(vp, LK_SHARED | LK_RETRY);
|
|
} else /* UIO_WRITE */ {
|
|
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
|
|
}
|
|
}
|
|
auio.uio_iov = &aiov;
|
|
auio.uio_iovcnt = 1;
|
|
aiov.iov_base = base;
|
|
aiov.iov_len = len;
|
|
auio.uio_resid = len;
|
|
auio.uio_offset = offset;
|
|
auio.uio_rw = rw;
|
|
if (segflg == UIO_SYSSPACE) {
|
|
UIO_SETUP_SYSSPACE(&auio);
|
|
} else {
|
|
auio.uio_vmspace = l->l_proc->p_vmspace;
|
|
}
|
|
|
|
if ((error = enforce_rlimit_fsize(vp, &auio, ioflg)) != 0)
|
|
goto out;
|
|
|
|
if (rw == UIO_READ) {
|
|
error = VOP_READ(vp, &auio, ioflg, cred);
|
|
} else {
|
|
error = VOP_WRITE(vp, &auio, ioflg, cred);
|
|
}
|
|
|
|
if (aresid)
|
|
*aresid = auio.uio_resid;
|
|
else
|
|
if (auio.uio_resid && error == 0)
|
|
error = EIO;
|
|
|
|
out:
|
|
if ((ioflg & IO_NODELOCKED) == 0) {
|
|
VOP_UNLOCK(vp);
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
int
|
|
vn_readdir(file_t *fp, char *bf, int segflg, u_int count, int *done,
|
|
struct lwp *l, off_t **cookies, int *ncookies)
|
|
{
|
|
struct vnode *vp = (struct vnode *)fp->f_data;
|
|
struct iovec aiov;
|
|
struct uio auio;
|
|
int error, eofflag;
|
|
|
|
/* Limit the size on any kernel buffers used by VOP_READDIR */
|
|
count = min(MAXBSIZE, count);
|
|
|
|
unionread:
|
|
if (vp->v_type != VDIR)
|
|
return (EINVAL);
|
|
aiov.iov_base = bf;
|
|
aiov.iov_len = count;
|
|
auio.uio_iov = &aiov;
|
|
auio.uio_iovcnt = 1;
|
|
auio.uio_rw = UIO_READ;
|
|
if (segflg == UIO_SYSSPACE) {
|
|
UIO_SETUP_SYSSPACE(&auio);
|
|
} else {
|
|
KASSERT(l == curlwp);
|
|
auio.uio_vmspace = l->l_proc->p_vmspace;
|
|
}
|
|
auio.uio_resid = count;
|
|
vn_lock(vp, LK_SHARED | LK_RETRY);
|
|
auio.uio_offset = fp->f_offset;
|
|
error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag, cookies,
|
|
ncookies);
|
|
mutex_enter(&fp->f_lock);
|
|
fp->f_offset = auio.uio_offset;
|
|
mutex_exit(&fp->f_lock);
|
|
VOP_UNLOCK(vp);
|
|
if (error)
|
|
return (error);
|
|
|
|
if (count == auio.uio_resid && vn_union_readdir_hook) {
|
|
struct vnode *ovp = vp;
|
|
|
|
error = (*vn_union_readdir_hook)(&vp, fp, l);
|
|
if (error)
|
|
return (error);
|
|
if (vp != ovp)
|
|
goto unionread;
|
|
}
|
|
|
|
if (count == auio.uio_resid && (vp->v_vflag & VV_ROOT) &&
|
|
(vp->v_mount->mnt_flag & MNT_UNION)) {
|
|
struct vnode *tvp = vp;
|
|
vp = vp->v_mount->mnt_vnodecovered;
|
|
vref(vp);
|
|
mutex_enter(&fp->f_lock);
|
|
fp->f_data = vp;
|
|
fp->f_offset = 0;
|
|
mutex_exit(&fp->f_lock);
|
|
vrele(tvp);
|
|
goto unionread;
|
|
}
|
|
*done = count - auio.uio_resid;
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* File table vnode read routine.
|
|
*/
|
|
static int
|
|
vn_read(file_t *fp, off_t *offset, struct uio *uio, kauth_cred_t cred,
|
|
int flags)
|
|
{
|
|
struct vnode *vp = (struct vnode *)fp->f_data;
|
|
int error, ioflag, fflag;
|
|
size_t count;
|
|
|
|
ioflag = IO_ADV_ENCODE(fp->f_advice);
|
|
fflag = fp->f_flag;
|
|
if (fflag & FNONBLOCK)
|
|
ioflag |= IO_NDELAY;
|
|
if ((fflag & (FFSYNC | FRSYNC)) == (FFSYNC | FRSYNC))
|
|
ioflag |= IO_SYNC;
|
|
if (fflag & FALTIO)
|
|
ioflag |= IO_ALTSEMANTICS;
|
|
if (fflag & FDIRECT)
|
|
ioflag |= IO_DIRECT;
|
|
vn_lock(vp, LK_SHARED | LK_RETRY);
|
|
uio->uio_offset = *offset;
|
|
count = uio->uio_resid;
|
|
error = VOP_READ(vp, uio, ioflag, cred);
|
|
if (flags & FOF_UPDATE_OFFSET)
|
|
*offset += count - uio->uio_resid;
|
|
VOP_UNLOCK(vp);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* File table vnode write routine.
|
|
*/
|
|
static int
|
|
vn_write(file_t *fp, off_t *offset, struct uio *uio, kauth_cred_t cred,
|
|
int flags)
|
|
{
|
|
struct vnode *vp = (struct vnode *)fp->f_data;
|
|
int error, ioflag, fflag;
|
|
size_t count;
|
|
|
|
ioflag = IO_ADV_ENCODE(fp->f_advice) | IO_UNIT;
|
|
fflag = fp->f_flag;
|
|
if (vp->v_type == VREG && (fflag & O_APPEND))
|
|
ioflag |= IO_APPEND;
|
|
if (fflag & FNONBLOCK)
|
|
ioflag |= IO_NDELAY;
|
|
if (fflag & FFSYNC ||
|
|
(vp->v_mount && (vp->v_mount->mnt_flag & MNT_SYNCHRONOUS)))
|
|
ioflag |= IO_SYNC;
|
|
else if (fflag & FDSYNC)
|
|
ioflag |= IO_DSYNC;
|
|
if (fflag & FALTIO)
|
|
ioflag |= IO_ALTSEMANTICS;
|
|
if (fflag & FDIRECT)
|
|
ioflag |= IO_DIRECT;
|
|
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
|
|
uio->uio_offset = *offset;
|
|
count = uio->uio_resid;
|
|
|
|
if ((error = enforce_rlimit_fsize(vp, uio, ioflag)) != 0)
|
|
goto out;
|
|
|
|
error = VOP_WRITE(vp, uio, ioflag, cred);
|
|
|
|
if (flags & FOF_UPDATE_OFFSET) {
|
|
if (ioflag & IO_APPEND) {
|
|
/*
|
|
* SUSv3 describes behaviour for count = 0 as following:
|
|
* "Before any action ... is taken, and if nbyte is zero
|
|
* and the file is a regular file, the write() function
|
|
* ... in the absence of errors ... shall return zero
|
|
* and have no other results."
|
|
*/
|
|
if (count)
|
|
*offset = uio->uio_offset;
|
|
} else
|
|
*offset += count - uio->uio_resid;
|
|
}
|
|
|
|
out:
|
|
VOP_UNLOCK(vp);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* File table vnode stat routine.
|
|
*/
|
|
static int
|
|
vn_statfile(file_t *fp, struct stat *sb)
|
|
{
|
|
struct vnode *vp = fp->f_data;
|
|
int error;
|
|
|
|
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
|
|
error = vn_stat(vp, sb);
|
|
VOP_UNLOCK(vp);
|
|
return error;
|
|
}
|
|
|
|
int
|
|
vn_stat(struct vnode *vp, struct stat *sb)
|
|
{
|
|
struct vattr va;
|
|
int error;
|
|
mode_t mode;
|
|
|
|
memset(&va, 0, sizeof(va));
|
|
error = VOP_GETATTR(vp, &va, kauth_cred_get());
|
|
if (error)
|
|
return (error);
|
|
/*
|
|
* Copy from vattr table
|
|
*/
|
|
memset(sb, 0, sizeof(*sb));
|
|
sb->st_dev = va.va_fsid;
|
|
sb->st_ino = va.va_fileid;
|
|
mode = va.va_mode;
|
|
switch (vp->v_type) {
|
|
case VREG:
|
|
mode |= S_IFREG;
|
|
break;
|
|
case VDIR:
|
|
mode |= S_IFDIR;
|
|
break;
|
|
case VBLK:
|
|
mode |= S_IFBLK;
|
|
break;
|
|
case VCHR:
|
|
mode |= S_IFCHR;
|
|
break;
|
|
case VLNK:
|
|
mode |= S_IFLNK;
|
|
break;
|
|
case VSOCK:
|
|
mode |= S_IFSOCK;
|
|
break;
|
|
case VFIFO:
|
|
mode |= S_IFIFO;
|
|
break;
|
|
default:
|
|
return (EBADF);
|
|
};
|
|
sb->st_mode = mode;
|
|
sb->st_nlink = va.va_nlink;
|
|
sb->st_uid = va.va_uid;
|
|
sb->st_gid = va.va_gid;
|
|
sb->st_rdev = va.va_rdev;
|
|
sb->st_size = va.va_size;
|
|
sb->st_atimespec = va.va_atime;
|
|
sb->st_mtimespec = va.va_mtime;
|
|
sb->st_ctimespec = va.va_ctime;
|
|
sb->st_birthtimespec = va.va_birthtime;
|
|
sb->st_blksize = va.va_blocksize;
|
|
sb->st_flags = va.va_flags;
|
|
sb->st_gen = 0;
|
|
sb->st_blocks = va.va_bytes / S_BLKSIZE;
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* File table vnode fcntl routine.
|
|
*/
|
|
static int
|
|
vn_fcntl(file_t *fp, u_int com, void *data)
|
|
{
|
|
struct vnode *vp = fp->f_data;
|
|
int error;
|
|
|
|
error = VOP_FCNTL(vp, com, data, fp->f_flag, kauth_cred_get());
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* File table vnode ioctl routine.
|
|
*/
|
|
static int
|
|
vn_ioctl(file_t *fp, u_long com, void *data)
|
|
{
|
|
struct vnode *vp = fp->f_data, *ovp;
|
|
struct vattr vattr;
|
|
int error;
|
|
|
|
switch (vp->v_type) {
|
|
|
|
case VREG:
|
|
case VDIR:
|
|
if (com == FIONREAD) {
|
|
vn_lock(vp, LK_SHARED | LK_RETRY);
|
|
error = VOP_GETATTR(vp, &vattr, kauth_cred_get());
|
|
VOP_UNLOCK(vp);
|
|
if (error)
|
|
return (error);
|
|
*(int *)data = vattr.va_size - fp->f_offset;
|
|
return (0);
|
|
}
|
|
if ((com == FIONWRITE) || (com == FIONSPACE)) {
|
|
/*
|
|
* Files don't have send queues, so there never
|
|
* are any bytes in them, nor is there any
|
|
* open space in them.
|
|
*/
|
|
*(int *)data = 0;
|
|
return (0);
|
|
}
|
|
if (com == FIOGETBMAP) {
|
|
daddr_t *block;
|
|
|
|
if (*(daddr_t *)data < 0)
|
|
return (EINVAL);
|
|
block = (daddr_t *)data;
|
|
return (VOP_BMAP(vp, *block, NULL, block, NULL));
|
|
}
|
|
if (com == OFIOGETBMAP) {
|
|
daddr_t ibn, obn;
|
|
|
|
if (*(int32_t *)data < 0)
|
|
return (EINVAL);
|
|
ibn = (daddr_t)*(int32_t *)data;
|
|
error = VOP_BMAP(vp, ibn, NULL, &obn, NULL);
|
|
*(int32_t *)data = (int32_t)obn;
|
|
return error;
|
|
}
|
|
if (com == FIONBIO || com == FIOASYNC) /* XXX */
|
|
return (0); /* XXX */
|
|
/* fall into ... */
|
|
case VFIFO:
|
|
case VCHR:
|
|
case VBLK:
|
|
error = VOP_IOCTL(vp, com, data, fp->f_flag,
|
|
kauth_cred_get());
|
|
if (error == 0 && com == TIOCSCTTY) {
|
|
vref(vp);
|
|
mutex_enter(proc_lock);
|
|
ovp = curproc->p_session->s_ttyvp;
|
|
curproc->p_session->s_ttyvp = vp;
|
|
mutex_exit(proc_lock);
|
|
if (ovp != NULL)
|
|
vrele(ovp);
|
|
}
|
|
return (error);
|
|
|
|
default:
|
|
return (EPASSTHROUGH);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* File table vnode poll routine.
|
|
*/
|
|
static int
|
|
vn_poll(file_t *fp, int events)
|
|
{
|
|
|
|
return (VOP_POLL(fp->f_data, events));
|
|
}
|
|
|
|
/*
|
|
* File table vnode kqfilter routine.
|
|
*/
|
|
int
|
|
vn_kqfilter(file_t *fp, struct knote *kn)
|
|
{
|
|
|
|
return (VOP_KQFILTER(fp->f_data, kn));
|
|
}
|
|
|
|
/*
|
|
* Check that the vnode is still valid, and if so
|
|
* acquire requested lock.
|
|
*/
|
|
int
|
|
vn_lock(struct vnode *vp, int flags)
|
|
{
|
|
int error;
|
|
|
|
#if 0
|
|
KASSERT(vp->v_usecount > 0 || (vp->v_iflag & VI_ONWORKLST) != 0);
|
|
#endif
|
|
KASSERT((flags & ~(LK_SHARED|LK_EXCLUSIVE|LK_NOWAIT|LK_RETRY)) == 0);
|
|
KASSERT(!mutex_owned(vp->v_interlock));
|
|
|
|
#ifdef DIAGNOSTIC
|
|
if (wapbl_vphaswapbl(vp))
|
|
WAPBL_JUNLOCK_ASSERT(wapbl_vptomp(vp));
|
|
#endif
|
|
|
|
do {
|
|
/*
|
|
* XXX PR 37706 forced unmount of file systems is unsafe.
|
|
* Race between vclean() and this the remaining problem.
|
|
*/
|
|
mutex_enter(vp->v_interlock);
|
|
if (vp->v_iflag & VI_XLOCK) {
|
|
if (flags & LK_NOWAIT) {
|
|
mutex_exit(vp->v_interlock);
|
|
return EBUSY;
|
|
}
|
|
vwait(vp, VI_XLOCK);
|
|
mutex_exit(vp->v_interlock);
|
|
error = ENOENT;
|
|
} else {
|
|
mutex_exit(vp->v_interlock);
|
|
error = VOP_LOCK(vp, (flags & ~LK_RETRY));
|
|
if (error == 0 || error == EDEADLK || error == EBUSY)
|
|
return (error);
|
|
}
|
|
} while (flags & LK_RETRY);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* File table vnode close routine.
|
|
*/
|
|
static int
|
|
vn_closefile(file_t *fp)
|
|
{
|
|
|
|
return vn_close(fp->f_data, fp->f_flag, fp->f_cred);
|
|
}
|
|
|
|
/*
|
|
* Simplified in-kernel wrapper calls for extended attribute access.
|
|
* Both calls pass in a NULL credential, authorizing a "kernel" access.
|
|
* Set IO_NODELOCKED in ioflg if the vnode is already locked.
|
|
*/
|
|
int
|
|
vn_extattr_get(struct vnode *vp, int ioflg, int attrnamespace,
|
|
const char *attrname, size_t *buflen, void *bf, struct lwp *l)
|
|
{
|
|
struct uio auio;
|
|
struct iovec aiov;
|
|
int error;
|
|
|
|
aiov.iov_len = *buflen;
|
|
aiov.iov_base = bf;
|
|
|
|
auio.uio_iov = &aiov;
|
|
auio.uio_iovcnt = 1;
|
|
auio.uio_rw = UIO_READ;
|
|
auio.uio_offset = 0;
|
|
auio.uio_resid = *buflen;
|
|
UIO_SETUP_SYSSPACE(&auio);
|
|
|
|
if ((ioflg & IO_NODELOCKED) == 0)
|
|
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
|
|
|
|
error = VOP_GETEXTATTR(vp, attrnamespace, attrname, &auio, NULL, NULL);
|
|
|
|
if ((ioflg & IO_NODELOCKED) == 0)
|
|
VOP_UNLOCK(vp);
|
|
|
|
if (error == 0)
|
|
*buflen = *buflen - auio.uio_resid;
|
|
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* XXX Failure mode if partially written?
|
|
*/
|
|
int
|
|
vn_extattr_set(struct vnode *vp, int ioflg, int attrnamespace,
|
|
const char *attrname, size_t buflen, const void *bf, struct lwp *l)
|
|
{
|
|
struct uio auio;
|
|
struct iovec aiov;
|
|
int error;
|
|
|
|
aiov.iov_len = buflen;
|
|
aiov.iov_base = __UNCONST(bf); /* XXXUNCONST kills const */
|
|
|
|
auio.uio_iov = &aiov;
|
|
auio.uio_iovcnt = 1;
|
|
auio.uio_rw = UIO_WRITE;
|
|
auio.uio_offset = 0;
|
|
auio.uio_resid = buflen;
|
|
UIO_SETUP_SYSSPACE(&auio);
|
|
|
|
if ((ioflg & IO_NODELOCKED) == 0) {
|
|
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
|
|
}
|
|
|
|
error = VOP_SETEXTATTR(vp, attrnamespace, attrname, &auio, NULL);
|
|
|
|
if ((ioflg & IO_NODELOCKED) == 0) {
|
|
VOP_UNLOCK(vp);
|
|
}
|
|
|
|
return (error);
|
|
}
|
|
|
|
int
|
|
vn_extattr_rm(struct vnode *vp, int ioflg, int attrnamespace,
|
|
const char *attrname, struct lwp *l)
|
|
{
|
|
int error;
|
|
|
|
if ((ioflg & IO_NODELOCKED) == 0) {
|
|
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
|
|
}
|
|
|
|
error = VOP_DELETEEXTATTR(vp, attrnamespace, attrname, NULL);
|
|
if (error == EOPNOTSUPP)
|
|
error = VOP_SETEXTATTR(vp, attrnamespace, attrname, NULL, NULL);
|
|
|
|
if ((ioflg & IO_NODELOCKED) == 0) {
|
|
VOP_UNLOCK(vp);
|
|
}
|
|
|
|
return (error);
|
|
}
|
|
|
|
void
|
|
vn_ra_allocctx(struct vnode *vp)
|
|
{
|
|
struct uvm_ractx *ra = NULL;
|
|
|
|
KASSERT(mutex_owned(vp->v_interlock));
|
|
|
|
if (vp->v_type != VREG) {
|
|
return;
|
|
}
|
|
if (vp->v_ractx != NULL) {
|
|
return;
|
|
}
|
|
if (vp->v_ractx == NULL) {
|
|
mutex_exit(vp->v_interlock);
|
|
ra = uvm_ra_allocctx();
|
|
mutex_enter(vp->v_interlock);
|
|
if (ra != NULL && vp->v_ractx == NULL) {
|
|
vp->v_ractx = ra;
|
|
ra = NULL;
|
|
}
|
|
}
|
|
if (ra != NULL) {
|
|
uvm_ra_freectx(ra);
|
|
}
|
|
}
|
|
|
|
int
|
|
vn_fifo_bypass(void *v)
|
|
{
|
|
struct vop_generic_args *ap = v;
|
|
|
|
return VOCALL(fifo_vnodeop_p, ap->a_desc->vdesc_offset, v);
|
|
}
|