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 2006 Sun Microsystems, Inc. All rights reserved.
23 * Use is subject to license terms.
26 #pragma ident "%Z%%M% %I% %E% SMI"
28 #include <sys/zfs_context.h>
30 #include <sys/vdev_file.h>
31 #include <sys/vdev_impl.h>
33 #include <sys/fs/zfs.h>
36 * Virtual device vector for files.
40 vdev_file_open(vdev_t *vd, uint64_t *psize, uint64_t *ashift)
48 * We must have a pathname, and it must be absolute.
50 if (vd->vdev_path == NULL || vd->vdev_path[0] != '/') {
51 vd->vdev_stat.vs_aux = VDEV_AUX_BAD_LABEL;
55 vf = vd->vdev_tsd = kmem_zalloc(sizeof (vdev_file_t), KM_SLEEP);
58 * We always open the files from the root of the global zone, even if
59 * we're in a local zone. If the user has gotten to this point, the
60 * administrator has already decided that the pool should be available
61 * to local zone users, so the underlying devices should be as well.
63 ASSERT(vd->vdev_path != NULL && vd->vdev_path[0] == '/');
64 error = vn_openat(vd->vdev_path + 1, UIO_SYSSPACE, spa_mode | FOFFMAX,
65 0, &vp, 0, 0, rootdir);
68 vd->vdev_stat.vs_aux = VDEV_AUX_OPEN_FAILED;
76 * Make sure it's a regular file.
78 if (vp->v_type != VREG) {
79 vd->vdev_stat.vs_aux = VDEV_AUX_OPEN_FAILED;
85 * Determine the physical size of the file.
87 vattr.va_mask = AT_SIZE;
88 error = VOP_GETATTR(vp, &vattr, 0, kcred);
90 vd->vdev_stat.vs_aux = VDEV_AUX_OPEN_FAILED;
94 *psize = vattr.va_size;
95 *ashift = SPA_MINBLOCKSHIFT;
101 vdev_file_close(vdev_t *vd)
103 vdev_file_t *vf = vd->vdev_tsd;
108 if (vf->vf_vnode != NULL) {
109 (void) VOP_PUTPAGE(vf->vf_vnode, 0, 0, B_INVAL, kcred);
110 (void) VOP_CLOSE(vf->vf_vnode, spa_mode, 1, 0, kcred);
111 VN_RELE(vf->vf_vnode);
114 kmem_free(vf, sizeof (vdev_file_t));
119 vdev_file_io_start(zio_t *zio)
121 vdev_t *vd = zio->io_vd;
122 vdev_file_t *vf = vd->vdev_tsd;
126 if (zio->io_type == ZIO_TYPE_IOCTL) {
127 zio_vdev_io_bypass(zio);
130 if (vdev_is_dead(vd)) {
131 zio->io_error = ENXIO;
132 zio_next_stage_async(zio);
136 switch (zio->io_cmd) {
137 case DKIOCFLUSHWRITECACHE:
138 zio->io_error = VOP_FSYNC(vf->vf_vnode, FSYNC | FDSYNC,
140 dprintf("fsync(%s) = %d\n", vdev_description(vd),
144 zio->io_error = ENOTSUP;
147 zio_next_stage_async(zio);
152 * In the kernel, don't bother double-caching, but in userland,
153 * we want to test the vdev_cache code.
156 if (zio->io_type == ZIO_TYPE_READ && vdev_cache_read(zio) == 0)
160 if ((zio = vdev_queue_io(zio)) == NULL)
164 error = vdev_is_dead(vd) ? ENXIO : vdev_error_inject(vd, zio);
166 zio->io_error = error;
167 zio_next_stage_async(zio);
171 zio->io_error = vn_rdwr(zio->io_type == ZIO_TYPE_READ ?
172 UIO_READ : UIO_WRITE, vf->vf_vnode, zio->io_data,
173 zio->io_size, zio->io_offset, UIO_SYSSPACE,
174 0, RLIM64_INFINITY, kcred, &resid);
176 if (resid != 0 && zio->io_error == 0)
177 zio->io_error = ENOSPC;
179 zio_next_stage_async(zio);
183 vdev_file_io_done(zio_t *zio)
185 vdev_queue_io_done(zio);
188 if (zio->io_type == ZIO_TYPE_WRITE)
189 vdev_cache_write(zio);
192 if (zio_injection_enabled && zio->io_error == 0)
193 zio->io_error = zio_handle_device_injection(zio->io_vd, EIO);
198 vdev_ops_t vdev_file_ops = {
205 VDEV_TYPE_FILE, /* name of this vdev type */
206 B_TRUE /* leaf vdev */
210 * From userland we access disks just like files.
214 vdev_ops_t vdev_disk_ops = {
221 VDEV_TYPE_DISK, /* name of this vdev type */
222 B_TRUE /* leaf vdev */