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, 2016 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 #include <sys/abd.h>
34
35 /*
36 * Virtual device vector for files.
37 */
38
39 static taskq_t *vdev_file_taskq;
40
41 void
vdev_file_init(void)42 vdev_file_init(void)
43 {
44 vdev_file_taskq = taskq_create("z_vdev_file", MAX(max_ncpus, 16),
45 minclsyspri, max_ncpus, INT_MAX, 0);
46 }
47
48 void
vdev_file_fini(void)49 vdev_file_fini(void)
50 {
51 taskq_destroy(vdev_file_taskq);
52 }
53
54 static void
vdev_file_hold(vdev_t * vd)55 vdev_file_hold(vdev_t *vd)
56 {
57 ASSERT(vd->vdev_path != NULL);
58 }
59
60 static void
vdev_file_rele(vdev_t * vd)61 vdev_file_rele(vdev_t *vd)
62 {
63 ASSERT(vd->vdev_path != NULL);
64 }
65
66 static int
vdev_file_open(vdev_t * vd,uint64_t * psize,uint64_t * max_psize,uint64_t * logical_ashift,uint64_t * physical_ashift)67 vdev_file_open(vdev_t *vd, uint64_t *psize, uint64_t *max_psize,
68 uint64_t *logical_ashift, uint64_t *physical_ashift)
69 {
70 vdev_file_t *vf;
71 vnode_t *vp;
72 vattr_t vattr;
73 int error;
74
75 /* Rotational optimizations only make sense on block devices */
76 vd->vdev_nonrot = B_TRUE;
77
78 /*
79 * We must have a pathname, and it must be absolute.
80 */
81 if (vd->vdev_path == NULL || vd->vdev_path[0] != '/') {
82 vd->vdev_stat.vs_aux = VDEV_AUX_BAD_LABEL;
83 return (SET_ERROR(EINVAL));
84 }
85
86 /*
87 * Reopen the device if it's not currently open. Otherwise,
88 * just update the physical size of the device.
89 */
90 if (vd->vdev_tsd != NULL) {
91 ASSERT(vd->vdev_reopening);
92 vf = vd->vdev_tsd;
93 vp = vf->vf_vnode;
94 goto skip_open;
95 }
96
97 vf = vd->vdev_tsd = kmem_zalloc(sizeof (vdev_file_t), KM_SLEEP);
98
99 /*
100 * We always open the files from the root of the global zone, even if
101 * we're in a local zone. If the user has gotten to this point, the
102 * administrator has already decided that the pool should be available
103 * to local zone users, so the underlying devices should be as well.
104 */
105 ASSERT(vd->vdev_path != NULL && vd->vdev_path[0] == '/');
106 error = vn_openat(vd->vdev_path + 1, UIO_SYSSPACE,
107 spa_mode(vd->vdev_spa) | FOFFMAX, 0, &vp, 0, 0, rootdir, -1);
108
109 if (error) {
110 vd->vdev_stat.vs_aux = VDEV_AUX_OPEN_FAILED;
111 kmem_free(vd->vdev_tsd, sizeof (vdev_file_t));
112 vd->vdev_tsd = NULL;
113 return (error);
114 }
115
116 vf->vf_vnode = vp;
117
118 #ifdef _KERNEL
119 /*
120 * Make sure it's a regular file.
121 */
122 if (vp->v_type != VREG) {
123 #ifdef __FreeBSD__
124 (void) VOP_CLOSE(vp, spa_mode(vd->vdev_spa), 1, 0, kcred, NULL);
125 #endif
126 vd->vdev_stat.vs_aux = VDEV_AUX_OPEN_FAILED;
127 #ifdef __FreeBSD__
128 kmem_free(vd->vdev_tsd, sizeof (vdev_file_t));
129 vd->vdev_tsd = NULL;
130 #endif
131 return (SET_ERROR(ENODEV));
132 }
133 #endif /* _KERNEL */
134
135 skip_open:
136 /*
137 * Determine the physical size of the file.
138 */
139 vattr.va_mask = AT_SIZE;
140 vn_lock(vp, LK_SHARED | LK_RETRY);
141 error = VOP_GETATTR(vp, &vattr, kcred);
142 VOP_UNLOCK(vp, 0);
143 if (error) {
144 (void) VOP_CLOSE(vp, spa_mode(vd->vdev_spa), 1, 0, kcred, NULL);
145 vd->vdev_stat.vs_aux = VDEV_AUX_OPEN_FAILED;
146 kmem_free(vd->vdev_tsd, sizeof (vdev_file_t));
147 vd->vdev_tsd = NULL;
148 return (error);
149 }
150
151 vd->vdev_notrim = B_TRUE;
152
153 *max_psize = *psize = vattr.va_size;
154 *logical_ashift = SPA_MINBLOCKSHIFT;
155 *physical_ashift = SPA_MINBLOCKSHIFT;
156
157 return (0);
158 }
159
160 static void
vdev_file_close(vdev_t * vd)161 vdev_file_close(vdev_t *vd)
162 {
163 vdev_file_t *vf = vd->vdev_tsd;
164
165 if (vd->vdev_reopening || vf == NULL)
166 return;
167
168 if (vf->vf_vnode != NULL) {
169 (void) VOP_CLOSE(vf->vf_vnode, spa_mode(vd->vdev_spa), 1, 0,
170 kcred, NULL);
171 }
172
173 vd->vdev_delayed_close = B_FALSE;
174 kmem_free(vf, sizeof (vdev_file_t));
175 vd->vdev_tsd = NULL;
176 }
177
178 /*
179 * Implements the interrupt side for file vdev types. This routine will be
180 * called when the I/O completes allowing us to transfer the I/O to the
181 * interrupt taskqs. For consistency, the code structure mimics disk vdev
182 * types.
183 */
184 static void
vdev_file_io_intr(zio_t * zio)185 vdev_file_io_intr(zio_t *zio)
186 {
187 zio_delay_interrupt(zio);
188 }
189
190 static void
vdev_file_io_strategy(void * arg)191 vdev_file_io_strategy(void *arg)
192 {
193 zio_t *zio = arg;
194 vdev_t *vd = zio->io_vd;
195 vdev_file_t *vf;
196 vnode_t *vp;
197 void *addr;
198 ssize_t resid;
199
200 vf = vd->vdev_tsd;
201 vp = vf->vf_vnode;
202
203 ASSERT(zio->io_type == ZIO_TYPE_READ || zio->io_type == ZIO_TYPE_WRITE);
204 if (zio->io_type == ZIO_TYPE_READ) {
205 addr = abd_borrow_buf(zio->io_abd, zio->io_size);
206 } else {
207 addr = abd_borrow_buf_copy(zio->io_abd, zio->io_size);
208 }
209
210 zio->io_error = vn_rdwr(zio->io_type == ZIO_TYPE_READ ?
211 UIO_READ : UIO_WRITE, vp, addr, zio->io_size,
212 zio->io_offset, UIO_SYSSPACE, 0, RLIM64_INFINITY, kcred, &resid);
213
214 if (zio->io_type == ZIO_TYPE_READ) {
215 abd_return_buf_copy(zio->io_abd, addr, zio->io_size);
216 } else {
217 abd_return_buf(zio->io_abd, addr, zio->io_size);
218 }
219
220 if (resid != 0 && zio->io_error == 0)
221 zio->io_error = ENOSPC;
222
223 vdev_file_io_intr(zio);
224 }
225
226 static void
vdev_file_io_start(zio_t * zio)227 vdev_file_io_start(zio_t *zio)
228 {
229 vdev_t *vd = zio->io_vd;
230 vdev_file_t *vf = vd->vdev_tsd;
231
232 if (zio->io_type == ZIO_TYPE_IOCTL) {
233 /* XXPOLICY */
234 if (!vdev_readable(vd)) {
235 zio->io_error = SET_ERROR(ENXIO);
236 zio_interrupt(zio);
237 return;
238 }
239
240 switch (zio->io_cmd) {
241 case DKIOCFLUSHWRITECACHE:
242
243 if (zfs_nocacheflush)
244 break;
245
246 zio->io_error = VOP_FSYNC(vf->vf_vnode, FSYNC | FDSYNC,
247 kcred, NULL);
248 break;
249 default:
250 zio->io_error = SET_ERROR(ENOTSUP);
251 }
252
253 zio_execute(zio);
254 return;
255 }
256
257 ASSERT(zio->io_type == ZIO_TYPE_READ || zio->io_type == ZIO_TYPE_WRITE);
258 zio->io_target_timestamp = zio_handle_io_delay(zio);
259
260 VERIFY3U(taskq_dispatch(vdev_file_taskq, vdev_file_io_strategy, zio,
261 TQ_SLEEP), !=, 0);
262 }
263
264 /* ARGSUSED */
265 static void
vdev_file_io_done(zio_t * zio)266 vdev_file_io_done(zio_t *zio)
267 {
268 }
269
270 vdev_ops_t vdev_file_ops = {
271 vdev_file_open,
272 vdev_file_close,
273 vdev_default_asize,
274 vdev_file_io_start,
275 vdev_file_io_done,
276 NULL,
277 NULL,
278 vdev_file_hold,
279 vdev_file_rele,
280 NULL,
281 vdev_default_xlate,
282 VDEV_TYPE_FILE, /* name of this vdev type */
283 B_TRUE /* leaf vdev */
284 };
285
286 /*
287 * From userland we access disks just like files.
288 */
289 #ifndef _KERNEL
290
291 vdev_ops_t vdev_disk_ops = {
292 vdev_file_open,
293 vdev_file_close,
294 vdev_default_asize,
295 vdev_file_io_start,
296 vdev_file_io_done,
297 NULL,
298 NULL,
299 vdev_file_hold,
300 vdev_file_rele,
301 NULL,
302 vdev_default_xlate,
303 VDEV_TYPE_DISK, /* name of this vdev type */
304 B_TRUE /* leaf vdev */
305 };
306
307 #endif
308