4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
22 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
23 * Copyright (c) 2012 by Delphix. All rights reserved.
26 #include <sys/zfs_context.h>
28 #include <sys/spa_impl.h>
29 #include <sys/vdev_file.h>
30 #include <sys/vdev_impl.h>
32 #include <sys/fs/zfs.h>
33 #include <sys/fm/fs/zfs.h>
36 * Virtual device vector for files.
40 vdev_file_hold(vdev_t *vd)
42 ASSERT(vd->vdev_path != NULL);
46 vdev_file_rele(vdev_t *vd)
48 ASSERT(vd->vdev_path != NULL);
52 vdev_file_open(vdev_t *vd, uint64_t *psize, uint64_t *max_psize,
61 * We must have a pathname, and it must be absolute.
63 if (vd->vdev_path == NULL || vd->vdev_path[0] != '/') {
64 vd->vdev_stat.vs_aux = VDEV_AUX_BAD_LABEL;
69 * Reopen the device if it's not currently open. Otherwise,
70 * just update the physical size of the device.
72 if (vd->vdev_tsd != NULL) {
73 ASSERT(vd->vdev_reopening);
78 vf = vd->vdev_tsd = kmem_zalloc(sizeof (vdev_file_t), KM_PUSHPAGE);
81 * We always open the files from the root of the global zone, even if
82 * we're in a local zone. If the user has gotten to this point, the
83 * administrator has already decided that the pool should be available
84 * to local zone users, so the underlying devices should be as well.
86 ASSERT(vd->vdev_path != NULL && vd->vdev_path[0] == '/');
87 error = vn_openat(vd->vdev_path + 1, UIO_SYSSPACE,
88 spa_mode(vd->vdev_spa) | FOFFMAX, 0, &vp, 0, 0, rootdir, -1);
91 vd->vdev_stat.vs_aux = VDEV_AUX_OPEN_FAILED;
99 * Make sure it's a regular file.
101 if (vp->v_type != VREG) {
102 vd->vdev_stat.vs_aux = VDEV_AUX_OPEN_FAILED;
109 * Determine the physical size of the file.
111 vattr.va_mask = AT_SIZE;
112 error = VOP_GETATTR(vf->vf_vnode, &vattr, 0, kcred, NULL);
114 vd->vdev_stat.vs_aux = VDEV_AUX_OPEN_FAILED;
118 *max_psize = *psize = vattr.va_size;
119 *ashift = SPA_MINBLOCKSHIFT;
125 vdev_file_close(vdev_t *vd)
127 vdev_file_t *vf = vd->vdev_tsd;
129 if (vd->vdev_reopening || vf == NULL)
132 if (vf->vf_vnode != NULL) {
133 (void) VOP_PUTPAGE(vf->vf_vnode, 0, 0, B_INVAL, kcred, NULL);
134 (void) VOP_CLOSE(vf->vf_vnode, spa_mode(vd->vdev_spa), 1, 0,
138 vd->vdev_delayed_close = B_FALSE;
139 kmem_free(vf, sizeof (vdev_file_t));
144 vdev_file_io_strategy(void *arg)
146 zio_t *zio = (zio_t *)arg;
147 vdev_t *vd = zio->io_vd;
148 vdev_file_t *vf = vd->vdev_tsd;
151 zio->io_error = vn_rdwr(zio->io_type == ZIO_TYPE_READ ?
152 UIO_READ : UIO_WRITE, vf->vf_vnode, zio->io_data,
153 zio->io_size, zio->io_offset, UIO_SYSSPACE,
154 0, RLIM64_INFINITY, kcred, &resid);
156 if (resid != 0 && zio->io_error == 0)
157 zio->io_error = ENOSPC;
163 vdev_file_io_start(zio_t *zio)
165 spa_t *spa = zio->io_spa;
166 vdev_t *vd = zio->io_vd;
167 vdev_file_t *vf = vd->vdev_tsd;
169 if (zio->io_type == ZIO_TYPE_IOCTL) {
171 if (!vdev_readable(vd)) {
172 zio->io_error = ENXIO;
173 return (ZIO_PIPELINE_CONTINUE);
176 switch (zio->io_cmd) {
177 case DKIOCFLUSHWRITECACHE:
178 zio->io_error = VOP_FSYNC(vf->vf_vnode, FSYNC | FDSYNC,
182 zio->io_error = ENOTSUP;
185 return (ZIO_PIPELINE_CONTINUE);
188 spa_taskq_dispatch_ent(spa, ZIO_TYPE_FREE, ZIO_TASKQ_ISSUE,
189 vdev_file_io_strategy, zio, 0, &zio->io_tqent);
191 return (ZIO_PIPELINE_STOP);
196 vdev_file_io_done(zio_t *zio)
200 vdev_ops_t vdev_file_ops = {
209 VDEV_TYPE_FILE, /* name of this vdev type */
210 B_TRUE /* leaf vdev */
214 * From userland we access disks just like files.
218 vdev_ops_t vdev_disk_ops = {
227 VDEV_TYPE_DISK, /* name of this vdev type */
228 B_TRUE /* leaf vdev */