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/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License (the "License").
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* You may not use this file except in compliance with the License.
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*
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* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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* or http://www.opensolaris.org/os/licensing.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* information: Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*/
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/*
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* Copyright 2006 Sun Microsystems, Inc. All rights reserved.
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* Use is subject to license terms.
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*/
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#pragma ident "%Z%%M% %I% %E% SMI"
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#include <sys/zfs_context.h>
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#include <sys/spa.h>
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#include <sys/vdev_file.h>
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#include <sys/vdev_impl.h>
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#include <sys/zio.h>
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#include <sys/fs/zfs.h>
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/*
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* Virtual device vector for files.
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*/
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static int
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vdev_file_open(vdev_t *vd, uint64_t *psize, uint64_t *ashift)
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{
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vdev_file_t *vf;
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vnode_t *vp;
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vattr_t vattr;
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int error;
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/*
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* We must have a pathname, and it must be absolute.
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*/
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if (vd->vdev_path == NULL || vd->vdev_path[0] != '/') {
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vd->vdev_stat.vs_aux = VDEV_AUX_BAD_LABEL;
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return (EINVAL);
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}
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vf = vd->vdev_tsd = kmem_zalloc(sizeof (vdev_file_t), KM_SLEEP);
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#ifdef _KERNEL
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/*
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* When using a file vdev in kernel context, the underlying filesystem
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* will already be caching the data. Don't cache it again here.
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*/
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vd->vdev_cache.vc_size = 0;
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#endif
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/*
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* We always open the files from the root of the global zone, even if
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* we're in a local zone. If the user has gotten to this point, the
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* administrator has already decided that the pool should be available
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* to local zone users, so the underlying devices should be as well.
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*/
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ASSERT(vd->vdev_path != NULL && vd->vdev_path[0] == '/');
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error = vn_openat(vd->vdev_path + 1, UIO_SYSSPACE, spa_mode | FOFFMAX,
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0, &vp, 0, 0, rootdir);
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if (error) {
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vd->vdev_stat.vs_aux = VDEV_AUX_OPEN_FAILED;
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return (error);
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}
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vf->vf_vnode = vp;
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#ifdef _KERNEL
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/*
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* Make sure it's a regular file.
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*/
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if (vp->v_type != VREG) {
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vd->vdev_stat.vs_aux = VDEV_AUX_OPEN_FAILED;
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return (ENODEV);
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}
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#endif
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/*
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* Determine the physical size of the file.
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*/
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vattr.va_mask = AT_SIZE;
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error = VOP_GETATTR(vp, &vattr, 0, kcred);
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if (error) {
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vd->vdev_stat.vs_aux = VDEV_AUX_OPEN_FAILED;
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return (error);
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}
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*psize = vattr.va_size;
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*ashift = SPA_MINBLOCKSHIFT;
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return (0);
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}
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static void
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vdev_file_close(vdev_t *vd)
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{
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vdev_file_t *vf = vd->vdev_tsd;
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if (vf == NULL)
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return;
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if (vf->vf_vnode != NULL) {
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(void) VOP_PUTPAGE(vf->vf_vnode, 0, 0, B_INVAL, kcred);
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(void) VOP_CLOSE(vf->vf_vnode, spa_mode, 1, 0, kcred);
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VN_RELE(vf->vf_vnode);
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}
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kmem_free(vf, sizeof (vdev_file_t));
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vd->vdev_tsd = NULL;
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}
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static void
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vdev_file_io_start(zio_t *zio)
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{
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vdev_t *vd = zio->io_vd;
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vdev_file_t *vf = vd->vdev_tsd;
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ssize_t resid;
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int error;
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if (zio->io_type == ZIO_TYPE_IOCTL) {
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zio_vdev_io_bypass(zio);
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/* XXPOLICY */
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if (vdev_is_dead(vd)) {
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zio->io_error = ENXIO;
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zio_next_stage_async(zio);
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return;
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}
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switch (zio->io_cmd) {
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case DKIOCFLUSHWRITECACHE:
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zio->io_error = VOP_FSYNC(vf->vf_vnode, FSYNC | FDSYNC,
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kcred);
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dprintf("fsync(%s) = %d\n", vdev_description(vd),
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zio->io_error);
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break;
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default:
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zio->io_error = ENOTSUP;
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}
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zio_next_stage_async(zio);
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return;
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}
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if (zio->io_type == ZIO_TYPE_READ && vdev_cache_read(zio) == 0)
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return;
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if ((zio = vdev_queue_io(zio)) == NULL)
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return;
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/* XXPOLICY */
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error = vdev_is_dead(vd) ? ENXIO : vdev_error_inject(vd, zio);
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if (error) {
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zio->io_error = error;
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zio_next_stage_async(zio);
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return;
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}
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zio->io_error = vn_rdwr(zio->io_type == ZIO_TYPE_READ ?
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UIO_READ : UIO_WRITE, vf->vf_vnode, zio->io_data,
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zio->io_size, zio->io_offset, UIO_SYSSPACE,
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0, RLIM64_INFINITY, kcred, &resid);
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if (resid != 0 && zio->io_error == 0)
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zio->io_error = ENOSPC;
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zio_next_stage_async(zio);
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}
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static void
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vdev_file_io_done(zio_t *zio)
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{
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vdev_queue_io_done(zio);
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if (zio->io_type == ZIO_TYPE_WRITE)
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vdev_cache_write(zio);
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if (zio_injection_enabled && zio->io_error == 0)
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zio->io_error = zio_handle_device_injection(zio->io_vd, EIO);
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zio_next_stage(zio);
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}
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vdev_ops_t vdev_file_ops = {
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vdev_file_open,
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vdev_file_close,
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vdev_default_asize,
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vdev_file_io_start,
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vdev_file_io_done,
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NULL,
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VDEV_TYPE_FILE, /* name of this vdev type */
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B_TRUE /* leaf vdev */
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};
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/*
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* From userland we access disks just like files.
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*/
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#ifndef _KERNEL
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vdev_ops_t vdev_disk_ops = {
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vdev_file_open,
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vdev_file_close,
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vdev_default_asize,
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vdev_file_io_start,
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vdev_file_io_done,
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NULL,
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VDEV_TYPE_DISK, /* name of this vdev type */
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B_TRUE /* leaf vdev */
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};
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#endif
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