1/*
2 * CDDL HEADER START
3 *
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.
7 *
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.
12 *
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]
18 *
19 * CDDL HEADER END
20 */
21/*
22 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
23 * Copyright (c) 2011, 2015 by Delphix. All rights reserved.
24 */
25
26#include <sys/zfs_context.h>
27#include <sys/spa.h>
28#include <sys/vdev_file.h>
29#include <sys/vdev_impl.h>
30#include <sys/zio.h>
31#include <sys/fs/zfs.h>
32#include <sys/fm/fs/zfs.h>
33
34/*
35 * Virtual device vector for files.
36 */
37
38static void
39vdev_file_hold(vdev_t *vd)
40{
41	ASSERT(vd->vdev_path != NULL);
42}
43
44static void
45vdev_file_rele(vdev_t *vd)
46{
47	ASSERT(vd->vdev_path != NULL);
48}
49
50static int
51vdev_file_open(vdev_t *vd, uint64_t *psize, uint64_t *max_psize,
52    uint64_t *logical_ashift, uint64_t *physical_ashift)
53{
54	vdev_file_t *vf;
55	vnode_t *vp;
56	vattr_t vattr;
57	int error;
58
59	/*
60	 * We must have a pathname, and it must be absolute.
61	 */
62	if (vd->vdev_path == NULL || vd->vdev_path[0] != '/') {
63		vd->vdev_stat.vs_aux = VDEV_AUX_BAD_LABEL;
64		return (SET_ERROR(EINVAL));
65	}
66
67	/*
68	 * Reopen the device if it's not currently open.  Otherwise,
69	 * just update the physical size of the device.
70	 */
71	if (vd->vdev_tsd != NULL) {
72		ASSERT(vd->vdev_reopening);
73		vf = vd->vdev_tsd;
74		vp = vf->vf_vnode;
75		goto skip_open;
76	}
77
78	vf = vd->vdev_tsd = kmem_zalloc(sizeof (vdev_file_t), KM_SLEEP);
79
80	/*
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.
85	 */
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);
89
90	if (error) {
91		vd->vdev_stat.vs_aux = VDEV_AUX_OPEN_FAILED;
92		kmem_free(vd->vdev_tsd, sizeof (vdev_file_t));
93		vd->vdev_tsd = NULL;
94		return (error);
95	}
96
97	vf->vf_vnode = vp;
98
99#ifdef _KERNEL
100	/*
101	 * Make sure it's a regular file.
102	 */
103	if (vp->v_type != VREG) {
104		(void) VOP_CLOSE(vp, spa_mode(vd->vdev_spa), 1, 0, kcred, NULL);
105		kmem_free(vd->vdev_tsd, sizeof (vdev_file_t));
106		vd->vdev_tsd = NULL;
107		vd->vdev_stat.vs_aux = VDEV_AUX_OPEN_FAILED;
108		return (SET_ERROR(ENODEV));
109	}
110#endif	/* _KERNEL */
111
112skip_open:
113	/*
114	 * Determine the physical size of the file.
115	 */
116	vattr.va_mask = AT_SIZE;
117#ifdef __FreeBSD__
118	vn_lock(vp, LK_SHARED | LK_RETRY);
119	error = VOP_GETATTR(vp, &vattr, kcred);
120	VOP_UNLOCK(vp, 0);
121#endif
122#ifdef __NetBSD__
123	error = VOP_GETATTR(vp, &vattr, 0, kcred, NULL);
124#endif
125	if (error) {
126		(void) VOP_CLOSE(vp, spa_mode(vd->vdev_spa), 1, 0, kcred, NULL);
127		vd->vdev_stat.vs_aux = VDEV_AUX_OPEN_FAILED;
128		kmem_free(vd->vdev_tsd, sizeof (vdev_file_t));
129		vd->vdev_tsd = NULL;
130		return (error);
131	}
132
133	vd->vdev_notrim = B_TRUE;
134
135	*max_psize = *psize = vattr.va_size;
136	*logical_ashift = SPA_MINBLOCKSHIFT;
137	*physical_ashift = SPA_MINBLOCKSHIFT;
138
139	return (0);
140}
141
142static void
143vdev_file_close(vdev_t *vd)
144{
145	vdev_file_t *vf = vd->vdev_tsd;
146
147	if (vd->vdev_reopening || vf == NULL)
148		return;
149
150	if (vf->vf_vnode != NULL) {
151		(void) VOP_CLOSE(vf->vf_vnode, spa_mode(vd->vdev_spa), 1, 0,
152		    kcred, NULL);
153	}
154
155	vd->vdev_delayed_close = B_FALSE;
156	kmem_free(vf, sizeof (vdev_file_t));
157	vd->vdev_tsd = NULL;
158}
159
160static void
161vdev_file_io_start(zio_t *zio)
162{
163	vdev_t *vd = zio->io_vd;
164	vdev_file_t *vf;
165	vnode_t *vp;
166	ssize_t resid;
167
168	if (!vdev_readable(vd)) {
169		zio->io_error = SET_ERROR(ENXIO);
170		zio_interrupt(zio);
171		return;
172	}
173
174	vf = vd->vdev_tsd;
175	vp = vf->vf_vnode;
176
177	if (zio->io_type == ZIO_TYPE_IOCTL) {
178		switch (zio->io_cmd) {
179		case DKIOCFLUSHWRITECACHE:
180			zio->io_error = VOP_FSYNC(vp, FSYNC | FDSYNC,
181			    kcred, NULL);
182			break;
183		default:
184			zio->io_error = SET_ERROR(ENOTSUP);
185		}
186
187		zio_execute(zio);
188		return;
189	}
190
191	ASSERT(zio->io_type == ZIO_TYPE_READ || zio->io_type == ZIO_TYPE_WRITE);
192	zio->io_target_timestamp = zio_handle_io_delay(zio);
193
194	zio->io_error = vn_rdwr(zio->io_type == ZIO_TYPE_READ ?
195	    UIO_READ : UIO_WRITE, vp, zio->io_data, zio->io_size,
196	    zio->io_offset, UIO_SYSSPACE, 0, RLIM64_INFINITY, kcred, &resid);
197
198	if (resid != 0 && zio->io_error == 0)
199		zio->io_error = ENOSPC;
200
201	zio_delay_interrupt(zio);
202
203#ifdef illumos
204	VERIFY3U(taskq_dispatch(system_taskq, vdev_file_io_strategy, bp,
205	    TQ_SLEEP), !=, 0);
206#endif
207}
208
209/* ARGSUSED */
210static void
211vdev_file_io_done(zio_t *zio)
212{
213}
214
215vdev_ops_t vdev_file_ops = {
216	vdev_file_open,
217	vdev_file_close,
218	vdev_default_asize,
219	vdev_file_io_start,
220	vdev_file_io_done,
221	NULL,
222	vdev_file_hold,
223	vdev_file_rele,
224	VDEV_TYPE_FILE,		/* name of this vdev type */
225	B_TRUE			/* leaf vdev */
226};
227
228/*
229 * From userland we access disks just like files.
230 */
231#ifndef _KERNEL
232
233vdev_ops_t vdev_disk_ops = {
234	vdev_file_open,
235	vdev_file_close,
236	vdev_default_asize,
237	vdev_file_io_start,
238	vdev_file_io_done,
239	NULL,
240	vdev_file_hold,
241	vdev_file_rele,
242	VDEV_TYPE_DISK,		/* name of this vdev type */
243	B_TRUE			/* leaf vdev */
244};
245
246#endif
247