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_disk.h>
31 #include <sys/vdev_impl.h>
32 #include <sys/fs/zfs.h>
34 #include <sys/sunldi.h>
37 * Virtual device vector for disks.
40 extern ldi_ident_t zfs_li;
42 typedef struct vdev_disk_buf {
48 vdev_disk_open(vdev_t *vd, uint64_t *psize, uint64_t *ashift)
55 * We must have a pathname, and it must be absolute.
57 if (vd->vdev_path == NULL || vd->vdev_path[0] != '/') {
58 vd->vdev_stat.vs_aux = VDEV_AUX_BAD_LABEL;
62 dvd = vd->vdev_tsd = kmem_zalloc(sizeof (vdev_disk_t), KM_SLEEP);
65 * When opening a disk device, we want to preserve the user's original
66 * intent. We always want to open the device by the path the user gave
67 * us, even if it is one of multiple paths to the save device. But we
68 * also want to be able to survive disks being removed/recabled.
69 * Therefore the sequence of opening devices is:
71 * 1. Try opening the device by path. For legacy pools without the
72 * 'whole_disk' property, attempt to fix the path by appending 's0'.
74 * 2. If the devid of the device matches the stored value, return
77 * 3. Otherwise, the device may have moved. Try opening the device
78 * by the devid instead.
81 if (vd->vdev_devid != NULL) {
82 if (ddi_devid_str_decode(vd->vdev_devid, &dvd->vd_devid,
83 &dvd->vd_minor) != 0) {
84 vd->vdev_stat.vs_aux = VDEV_AUX_BAD_LABEL;
89 error = EINVAL; /* presume failure */
91 if (vd->vdev_path != NULL) {
94 if (vd->vdev_wholedisk == -1ULL) {
95 size_t len = strlen(vd->vdev_path) + 3;
96 char *buf = kmem_alloc(len, KM_SLEEP);
99 (void) snprintf(buf, len, "%ss0", vd->vdev_path);
101 if (ldi_open_by_name(buf, spa_mode, kcred,
103 spa_strfree(vd->vdev_path);
105 vd->vdev_wholedisk = 1ULL;
106 (void) ldi_close(lh, spa_mode, kcred);
112 error = ldi_open_by_name(vd->vdev_path, spa_mode, kcred,
113 &dvd->vd_lh, zfs_li);
116 * Compare the devid to the stored value.
118 if (error == 0 && vd->vdev_devid != NULL &&
119 ldi_get_devid(dvd->vd_lh, &devid) == 0) {
120 if (ddi_devid_compare(devid, dvd->vd_devid) != 0) {
122 (void) ldi_close(dvd->vd_lh, spa_mode, kcred);
125 ddi_devid_free(devid);
129 * If we succeeded in opening the device, but 'vdev_wholedisk'
130 * is not yet set, then this must be a slice.
132 if (error == 0 && vd->vdev_wholedisk == -1ULL)
133 vd->vdev_wholedisk = 0;
137 * If we were unable to open by path, or the devid check fails, open by
140 if (error != 0 && vd->vdev_devid != NULL)
141 error = ldi_open_by_devid(dvd->vd_devid, dvd->vd_minor,
142 spa_mode, kcred, &dvd->vd_lh, zfs_li);
145 vd->vdev_stat.vs_aux = VDEV_AUX_OPEN_FAILED;
150 * Determine the actual size of the device.
152 if (ldi_get_size(dvd->vd_lh, psize) != 0) {
153 vd->vdev_stat.vs_aux = VDEV_AUX_OPEN_FAILED;
158 * If we own the whole disk, try to enable disk write caching.
159 * We ignore errors because it's OK if we can't do it.
161 if (vd->vdev_wholedisk == 1) {
163 (void) ldi_ioctl(dvd->vd_lh, DKIOCSETWCE, (intptr_t)&wce,
164 FKIOCTL, kcred, NULL);
168 * Determine the device's minimum transfer size.
169 * If the ioctl isn't supported, assume DEV_BSIZE.
171 if (ldi_ioctl(dvd->vd_lh, DKIOCGMEDIAINFO, (intptr_t)&dkm,
172 FKIOCTL, kcred, NULL) != 0)
173 dkm.dki_lbsize = DEV_BSIZE;
175 *ashift = highbit(MAX(dkm.dki_lbsize, SPA_MINBLOCKSIZE)) - 1;
178 * Clear the nowritecache bit, so that on a vdev_reopen() we will
181 vd->vdev_nowritecache = B_FALSE;
187 vdev_disk_close(vdev_t *vd)
189 vdev_disk_t *dvd = vd->vdev_tsd;
194 dprintf("removing disk %s, devid %s\n",
195 vd->vdev_path ? vd->vdev_path : "<none>",
196 vd->vdev_devid ? vd->vdev_devid : "<none>");
198 if (dvd->vd_minor != NULL)
199 ddi_devid_str_free(dvd->vd_minor);
201 if (dvd->vd_devid != NULL)
202 ddi_devid_free(dvd->vd_devid);
204 if (dvd->vd_lh != NULL)
205 (void) ldi_close(dvd->vd_lh, spa_mode, kcred);
207 kmem_free(dvd, sizeof (vdev_disk_t));
212 vdev_disk_io_intr(buf_t *bp)
214 vdev_disk_buf_t *vdb = (vdev_disk_buf_t *)bp;
215 zio_t *zio = vdb->vdb_io;
217 if ((zio->io_error = geterror(bp)) == 0 && bp->b_resid != 0)
220 kmem_free(vdb, sizeof (vdev_disk_buf_t));
222 zio_next_stage_async(zio);
226 vdev_disk_ioctl_done(void *zio_arg, int error)
228 zio_t *zio = zio_arg;
230 zio->io_error = error;
232 zio_next_stage_async(zio);
236 vdev_disk_io_start(zio_t *zio)
238 vdev_t *vd = zio->io_vd;
239 vdev_disk_t *dvd = vd->vdev_tsd;
240 vdev_disk_buf_t *vdb;
244 if (zio->io_type == ZIO_TYPE_IOCTL) {
245 zio_vdev_io_bypass(zio);
248 if (vdev_is_dead(vd)) {
249 zio->io_error = ENXIO;
250 zio_next_stage_async(zio);
254 switch (zio->io_cmd) {
256 case DKIOCFLUSHWRITECACHE:
258 if (zfs_nocacheflush)
261 if (vd->vdev_nowritecache) {
262 zio->io_error = ENOTSUP;
266 zio->io_dk_callback.dkc_callback = vdev_disk_ioctl_done;
267 zio->io_dk_callback.dkc_cookie = zio;
269 error = ldi_ioctl(dvd->vd_lh, zio->io_cmd,
270 (uintptr_t)&zio->io_dk_callback,
271 FKIOCTL, kcred, NULL);
275 * The ioctl will be done asychronously,
276 * and will call vdev_disk_ioctl_done()
280 } else if (error == ENOTSUP) {
282 * If we get ENOTSUP, we know that no future
283 * attempts will ever succeed. In this case we
284 * set a persistent bit so that we don't bother
285 * with the ioctl in the future.
287 vd->vdev_nowritecache = B_TRUE;
289 zio->io_error = error;
294 zio->io_error = ENOTSUP;
297 zio_next_stage_async(zio);
301 if (zio->io_type == ZIO_TYPE_READ && vdev_cache_read(zio) == 0)
304 if ((zio = vdev_queue_io(zio)) == NULL)
307 flags = (zio->io_type == ZIO_TYPE_READ ? B_READ : B_WRITE);
308 flags |= B_BUSY | B_NOCACHE;
309 if (zio->io_flags & ZIO_FLAG_FAILFAST)
312 vdb = kmem_alloc(sizeof (vdev_disk_buf_t), KM_SLEEP);
319 bp->b_bcount = zio->io_size;
320 bp->b_un.b_addr = zio->io_data;
321 bp->b_lblkno = lbtodb(zio->io_offset);
322 bp->b_bufsize = zio->io_size;
323 bp->b_iodone = (int (*)())vdev_disk_io_intr;
326 error = vdev_is_dead(vd) ? ENXIO : vdev_error_inject(vd, zio);
328 zio->io_error = error;
330 bp->b_resid = bp->b_bcount;
335 error = ldi_strategy(dvd->vd_lh, bp);
336 /* ldi_strategy() will return non-zero only on programming errors */
341 vdev_disk_io_done(zio_t *zio)
343 vdev_queue_io_done(zio);
345 if (zio->io_type == ZIO_TYPE_WRITE)
346 vdev_cache_write(zio);
348 if (zio_injection_enabled && zio->io_error == 0)
349 zio->io_error = zio_handle_device_injection(zio->io_vd, EIO);
354 vdev_ops_t vdev_disk_ops = {
361 VDEV_TYPE_DISK, /* name of this vdev type */
362 B_TRUE /* leaf vdev */