24 */
25
26#include <sys/zfs_context.h>
27#include <sys/param.h>
28#include <sys/kernel.h>
29#include <sys/bio.h>
30#include <sys/disk.h>
31#include <sys/spa.h>
32#include <sys/spa_impl.h>
33#include <sys/vdev_impl.h>
34#include <sys/fs/zfs.h>
35#include <sys/zio.h>
36#include <geom/geom.h>
37#include <geom/geom_int.h>
38
39/*
40 * Virtual device vector for GEOM.
41 */
42
43struct g_class zfs_vdev_class = {
44 .name = "ZFS::VDEV",
45 .version = G_VERSION,
46};
47
48DECLARE_GEOM_CLASS(zfs_vdev_class, zfs_vdev);
49
50/*
51 * Don't send BIO_FLUSH.
52 */
53static int vdev_geom_bio_flush_disable = 0;
54TUNABLE_INT("vfs.zfs.vdev.bio_flush_disable", &vdev_geom_bio_flush_disable);
55SYSCTL_DECL(_vfs_zfs_vdev);
56SYSCTL_INT(_vfs_zfs_vdev, OID_AUTO, bio_flush_disable, CTLFLAG_RW,
57 &vdev_geom_bio_flush_disable, 0, "Disable BIO_FLUSH");
58
59static void
60vdev_geom_orphan(struct g_consumer *cp)
61{
62 vdev_t *vd;
63
64 g_topology_assert();
65
66 vd = cp->private;
67
68 /*
69 * Orphan callbacks occur from the GEOM event thread.
70 * Concurrent with this call, new I/O requests may be
71 * working their way through GEOM about to find out
72 * (only once executed by the g_down thread) that we've
73 * been orphaned from our disk provider. These I/Os
74 * must be retired before we can detach our consumer.
75 * This is most easily achieved by acquiring the
76 * SPA ZIO configuration lock as a writer, but doing
77 * so with the GEOM topology lock held would cause
78 * a lock order reversal. Instead, rely on the SPA's
79 * async removal support to invoke a close on this
80 * vdev once it is safe to do so.
81 */
82 zfs_post_remove(vd->vdev_spa, vd);
83 vd->vdev_remove_wanted = B_TRUE;
84 spa_async_request(vd->vdev_spa, SPA_ASYNC_REMOVE);
85}
86
87static struct g_consumer *
88vdev_geom_attach(struct g_provider *pp)
89{
90 struct g_geom *gp;
91 struct g_consumer *cp;
92
93 g_topology_assert();
94
95 ZFS_LOG(1, "Attaching to %s.", pp->name);
96 /* Do we have geom already? No? Create one. */
97 LIST_FOREACH(gp, &zfs_vdev_class.geom, geom) {
98 if (gp->flags & G_GEOM_WITHER)
99 continue;
100 if (strcmp(gp->name, "zfs::vdev") != 0)
101 continue;
102 break;
103 }
104 if (gp == NULL) {
105 gp = g_new_geomf(&zfs_vdev_class, "zfs::vdev");
106 gp->orphan = vdev_geom_orphan;
107 cp = g_new_consumer(gp);
108 if (g_attach(cp, pp) != 0) {
109 g_wither_geom(gp, ENXIO);
110 return (NULL);
111 }
112 if (g_access(cp, 1, 0, 1) != 0) {
113 g_wither_geom(gp, ENXIO);
114 return (NULL);
115 }
116 ZFS_LOG(1, "Created geom and consumer for %s.", pp->name);
117 } else {
118 /* Check if we are already connected to this provider. */
119 LIST_FOREACH(cp, &gp->consumer, consumer) {
120 if (cp->provider == pp) {
121 ZFS_LOG(1, "Found consumer for %s.", pp->name);
122 break;
123 }
124 }
125 if (cp == NULL) {
126 cp = g_new_consumer(gp);
127 if (g_attach(cp, pp) != 0) {
128 g_destroy_consumer(cp);
129 return (NULL);
130 }
131 if (g_access(cp, 1, 0, 1) != 0) {
132 g_detach(cp);
133 g_destroy_consumer(cp);
134 return (NULL);
135 }
136 ZFS_LOG(1, "Created consumer for %s.", pp->name);
137 } else {
138 if (g_access(cp, 1, 0, 1) != 0)
139 return (NULL);
140 ZFS_LOG(1, "Used existing consumer for %s.", pp->name);
141 }
142 }
143 return (cp);
144}
145
146static void
147vdev_geom_detach(void *arg, int flag __unused)
148{
149 struct g_geom *gp;
150 struct g_consumer *cp;
151
152 g_topology_assert();
153 cp = arg;
154 gp = cp->geom;
155
156 ZFS_LOG(1, "Closing access to %s.", cp->provider->name);
157 g_access(cp, -1, 0, -1);
158 /* Destroy consumer on last close. */
159 if (cp->acr == 0 && cp->ace == 0) {
160 ZFS_LOG(1, "Destroyed consumer to %s.", cp->provider->name);
161 if (cp->acw > 0)
162 g_access(cp, 0, -cp->acw, 0);
163 g_detach(cp);
164 g_destroy_consumer(cp);
165 }
166 /* Destroy geom if there are no consumers left. */
167 if (LIST_EMPTY(&gp->consumer)) {
168 ZFS_LOG(1, "Destroyed geom %s.", gp->name);
169 g_wither_geom(gp, ENXIO);
170 }
171}
172
173static uint64_t
174nvlist_get_guid(nvlist_t *list)
175{
176 nvpair_t *elem = NULL;
177 uint64_t value;
178
179 while ((elem = nvlist_next_nvpair(list, elem)) != NULL) {
180 if (nvpair_type(elem) == DATA_TYPE_UINT64 &&
181 strcmp(nvpair_name(elem), "guid") == 0) {
182 VERIFY(nvpair_value_uint64(elem, &value) == 0);
183 return (value);
184 }
185 }
186 return (0);
187}
188
189static int
190vdev_geom_io(struct g_consumer *cp, int cmd, void *data, off_t offset, off_t size)
191{
192 struct bio *bp;
193 u_char *p;
194 off_t off, maxio;
195 int error;
196
197 ASSERT((offset % cp->provider->sectorsize) == 0);
198 ASSERT((size % cp->provider->sectorsize) == 0);
199
200 bp = g_alloc_bio();
201 off = offset;
202 offset += size;
203 p = data;
204 maxio = MAXPHYS - (MAXPHYS % cp->provider->sectorsize);
205 error = 0;
206
207 for (; off < offset; off += maxio, p += maxio, size -= maxio) {
208 bzero(bp, sizeof(*bp));
209 bp->bio_cmd = cmd;
210 bp->bio_done = NULL;
211 bp->bio_offset = off;
212 bp->bio_length = MIN(size, maxio);
213 bp->bio_data = p;
214 g_io_request(bp, cp);
215 error = biowait(bp, "vdev_geom_io");
216 if (error != 0)
217 break;
218 }
219
220 g_destroy_bio(bp);
221 return (error);
222}
223
224static uint64_t
225vdev_geom_read_guid(struct g_consumer *cp)
226{
227 struct g_provider *pp;
228 vdev_label_t *label;
229 char *p, *buf;
230 size_t buflen;
231 uint64_t psize;
232 off_t offset, size;
233 uint64_t guid;
234 int error, l, len;
235
236 g_topology_assert_not();
237
238 pp = cp->provider;
239 ZFS_LOG(1, "Reading guid from %s...", pp->name);
240
241 psize = pp->mediasize;
242 psize = P2ALIGN(psize, (uint64_t)sizeof(vdev_label_t));
243
244 size = sizeof(*label) + pp->sectorsize -
245 ((sizeof(*label) - 1) % pp->sectorsize) - 1;
246
247 guid = 0;
248 label = kmem_alloc(size, KM_SLEEP);
249 buflen = sizeof(label->vl_vdev_phys.vp_nvlist);
250
251 for (l = 0; l < VDEV_LABELS; l++) {
252 nvlist_t *config = NULL;
253
254 offset = vdev_label_offset(psize, l, 0);
255 if ((offset % pp->sectorsize) != 0)
256 continue;
257
258 if (vdev_geom_io(cp, BIO_READ, label, offset, size) != 0)
259 continue;
260 buf = label->vl_vdev_phys.vp_nvlist;
261
262 if (nvlist_unpack(buf, buflen, &config, 0) != 0)
263 continue;
264
265 guid = nvlist_get_guid(config);
266 nvlist_free(config);
267 if (guid != 0)
268 break;
269 }
270
271 kmem_free(label, size);
272 if (guid != 0)
273 ZFS_LOG(1, "guid for %s is %ju", pp->name, (uintmax_t)guid);
274 return (guid);
275}
276
277static void
278vdev_geom_taste_orphan(struct g_consumer *cp)
279{
280
281 KASSERT(1 == 0, ("%s called while tasting %s.", __func__,
282 cp->provider->name));
283}
284
285static struct g_consumer *
286vdev_geom_attach_by_guid(uint64_t guid)
287{
288 struct g_class *mp;
289 struct g_geom *gp, *zgp;
290 struct g_provider *pp;
291 struct g_consumer *cp, *zcp;
292 uint64_t pguid;
293
294 g_topology_assert();
295
296 zgp = g_new_geomf(&zfs_vdev_class, "zfs::vdev::taste");
297 /* This orphan function should be never called. */
298 zgp->orphan = vdev_geom_taste_orphan;
299 zcp = g_new_consumer(zgp);
300
301 cp = NULL;
302 LIST_FOREACH(mp, &g_classes, class) {
303 if (mp == &zfs_vdev_class)
304 continue;
305 LIST_FOREACH(gp, &mp->geom, geom) {
306 if (gp->flags & G_GEOM_WITHER)
307 continue;
308 LIST_FOREACH(pp, &gp->provider, provider) {
309 if (pp->flags & G_PF_WITHER)
310 continue;
311 g_attach(zcp, pp);
312 if (g_access(zcp, 1, 0, 0) != 0) {
313 g_detach(zcp);
314 continue;
315 }
316 g_topology_unlock();
317 pguid = vdev_geom_read_guid(zcp);
318 g_topology_lock();
319 g_access(zcp, -1, 0, 0);
320 g_detach(zcp);
321 if (pguid != guid)
322 continue;
323 cp = vdev_geom_attach(pp);
324 if (cp == NULL) {
325 printf("ZFS WARNING: Unable to attach to %s.\n",
326 pp->name);
327 continue;
328 }
329 break;
330 }
331 if (cp != NULL)
332 break;
333 }
334 if (cp != NULL)
335 break;
336 }
337end:
338 g_destroy_consumer(zcp);
339 g_destroy_geom(zgp);
340 return (cp);
341}
342
343static struct g_consumer *
344vdev_geom_open_by_guid(vdev_t *vd)
345{
346 struct g_consumer *cp;
347 char *buf;
348 size_t len;
349
350 g_topology_assert();
351
352 ZFS_LOG(1, "Searching by guid [%ju].", (uintmax_t)vd->vdev_guid);
353 cp = vdev_geom_attach_by_guid(vd->vdev_guid);
354 if (cp != NULL) {
355 len = strlen(cp->provider->name) + strlen("/dev/") + 1;
356 buf = kmem_alloc(len, KM_SLEEP);
357
358 snprintf(buf, len, "/dev/%s", cp->provider->name);
359 spa_strfree(vd->vdev_path);
360 vd->vdev_path = buf;
361
362 ZFS_LOG(1, "Attach by guid [%ju] succeeded, provider %s.",
363 (uintmax_t)vd->vdev_guid, vd->vdev_path);
364 } else {
365 ZFS_LOG(1, "Search by guid [%ju] failed.",
366 (uintmax_t)vd->vdev_guid);
367 }
368
369 return (cp);
370}
371
372static struct g_consumer *
373vdev_geom_open_by_path(vdev_t *vd, int check_guid)
374{
375 struct g_provider *pp;
376 struct g_consumer *cp;
377 uint64_t guid;
378
379 g_topology_assert();
380
381 cp = NULL;
382 pp = g_provider_by_name(vd->vdev_path + sizeof("/dev/") - 1);
383 if (pp != NULL) {
384 ZFS_LOG(1, "Found provider by name %s.", vd->vdev_path);
385 cp = vdev_geom_attach(pp);
386 if (cp != NULL && check_guid && ISP2(pp->sectorsize) &&
387 pp->sectorsize <= VDEV_PAD_SIZE) {
388 g_topology_unlock();
389 guid = vdev_geom_read_guid(cp);
390 g_topology_lock();
391 if (guid != vd->vdev_guid) {
392 vdev_geom_detach(cp, 0);
393 cp = NULL;
394 ZFS_LOG(1, "guid mismatch for provider %s: "
395 "%ju != %ju.", vd->vdev_path,
396 (uintmax_t)vd->vdev_guid, (uintmax_t)guid);
397 } else {
398 ZFS_LOG(1, "guid match for provider %s.",
399 vd->vdev_path);
400 }
401 }
402 }
403
404 return (cp);
405}
406
407static int
| 26 */
27
28#include <sys/zfs_context.h>
29#include <sys/param.h>
30#include <sys/kernel.h>
31#include <sys/bio.h>
32#include <sys/disk.h>
33#include <sys/spa.h>
34#include <sys/spa_impl.h>
35#include <sys/vdev_impl.h>
36#include <sys/fs/zfs.h>
37#include <sys/zio.h>
38#include <geom/geom.h>
39#include <geom/geom_int.h>
40
41/*
42 * Virtual device vector for GEOM.
43 */
44
45struct g_class zfs_vdev_class = {
46 .name = "ZFS::VDEV",
47 .version = G_VERSION,
48};
49
50DECLARE_GEOM_CLASS(zfs_vdev_class, zfs_vdev);
51
52/*
53 * Don't send BIO_FLUSH.
54 */
55static int vdev_geom_bio_flush_disable = 0;
56TUNABLE_INT("vfs.zfs.vdev.bio_flush_disable", &vdev_geom_bio_flush_disable);
57SYSCTL_DECL(_vfs_zfs_vdev);
58SYSCTL_INT(_vfs_zfs_vdev, OID_AUTO, bio_flush_disable, CTLFLAG_RW,
59 &vdev_geom_bio_flush_disable, 0, "Disable BIO_FLUSH");
60
61static void
62vdev_geom_orphan(struct g_consumer *cp)
63{
64 vdev_t *vd;
65
66 g_topology_assert();
67
68 vd = cp->private;
69
70 /*
71 * Orphan callbacks occur from the GEOM event thread.
72 * Concurrent with this call, new I/O requests may be
73 * working their way through GEOM about to find out
74 * (only once executed by the g_down thread) that we've
75 * been orphaned from our disk provider. These I/Os
76 * must be retired before we can detach our consumer.
77 * This is most easily achieved by acquiring the
78 * SPA ZIO configuration lock as a writer, but doing
79 * so with the GEOM topology lock held would cause
80 * a lock order reversal. Instead, rely on the SPA's
81 * async removal support to invoke a close on this
82 * vdev once it is safe to do so.
83 */
84 zfs_post_remove(vd->vdev_spa, vd);
85 vd->vdev_remove_wanted = B_TRUE;
86 spa_async_request(vd->vdev_spa, SPA_ASYNC_REMOVE);
87}
88
89static struct g_consumer *
90vdev_geom_attach(struct g_provider *pp)
91{
92 struct g_geom *gp;
93 struct g_consumer *cp;
94
95 g_topology_assert();
96
97 ZFS_LOG(1, "Attaching to %s.", pp->name);
98 /* Do we have geom already? No? Create one. */
99 LIST_FOREACH(gp, &zfs_vdev_class.geom, geom) {
100 if (gp->flags & G_GEOM_WITHER)
101 continue;
102 if (strcmp(gp->name, "zfs::vdev") != 0)
103 continue;
104 break;
105 }
106 if (gp == NULL) {
107 gp = g_new_geomf(&zfs_vdev_class, "zfs::vdev");
108 gp->orphan = vdev_geom_orphan;
109 cp = g_new_consumer(gp);
110 if (g_attach(cp, pp) != 0) {
111 g_wither_geom(gp, ENXIO);
112 return (NULL);
113 }
114 if (g_access(cp, 1, 0, 1) != 0) {
115 g_wither_geom(gp, ENXIO);
116 return (NULL);
117 }
118 ZFS_LOG(1, "Created geom and consumer for %s.", pp->name);
119 } else {
120 /* Check if we are already connected to this provider. */
121 LIST_FOREACH(cp, &gp->consumer, consumer) {
122 if (cp->provider == pp) {
123 ZFS_LOG(1, "Found consumer for %s.", pp->name);
124 break;
125 }
126 }
127 if (cp == NULL) {
128 cp = g_new_consumer(gp);
129 if (g_attach(cp, pp) != 0) {
130 g_destroy_consumer(cp);
131 return (NULL);
132 }
133 if (g_access(cp, 1, 0, 1) != 0) {
134 g_detach(cp);
135 g_destroy_consumer(cp);
136 return (NULL);
137 }
138 ZFS_LOG(1, "Created consumer for %s.", pp->name);
139 } else {
140 if (g_access(cp, 1, 0, 1) != 0)
141 return (NULL);
142 ZFS_LOG(1, "Used existing consumer for %s.", pp->name);
143 }
144 }
145 return (cp);
146}
147
148static void
149vdev_geom_detach(void *arg, int flag __unused)
150{
151 struct g_geom *gp;
152 struct g_consumer *cp;
153
154 g_topology_assert();
155 cp = arg;
156 gp = cp->geom;
157
158 ZFS_LOG(1, "Closing access to %s.", cp->provider->name);
159 g_access(cp, -1, 0, -1);
160 /* Destroy consumer on last close. */
161 if (cp->acr == 0 && cp->ace == 0) {
162 ZFS_LOG(1, "Destroyed consumer to %s.", cp->provider->name);
163 if (cp->acw > 0)
164 g_access(cp, 0, -cp->acw, 0);
165 g_detach(cp);
166 g_destroy_consumer(cp);
167 }
168 /* Destroy geom if there are no consumers left. */
169 if (LIST_EMPTY(&gp->consumer)) {
170 ZFS_LOG(1, "Destroyed geom %s.", gp->name);
171 g_wither_geom(gp, ENXIO);
172 }
173}
174
175static uint64_t
176nvlist_get_guid(nvlist_t *list)
177{
178 nvpair_t *elem = NULL;
179 uint64_t value;
180
181 while ((elem = nvlist_next_nvpair(list, elem)) != NULL) {
182 if (nvpair_type(elem) == DATA_TYPE_UINT64 &&
183 strcmp(nvpair_name(elem), "guid") == 0) {
184 VERIFY(nvpair_value_uint64(elem, &value) == 0);
185 return (value);
186 }
187 }
188 return (0);
189}
190
191static int
192vdev_geom_io(struct g_consumer *cp, int cmd, void *data, off_t offset, off_t size)
193{
194 struct bio *bp;
195 u_char *p;
196 off_t off, maxio;
197 int error;
198
199 ASSERT((offset % cp->provider->sectorsize) == 0);
200 ASSERT((size % cp->provider->sectorsize) == 0);
201
202 bp = g_alloc_bio();
203 off = offset;
204 offset += size;
205 p = data;
206 maxio = MAXPHYS - (MAXPHYS % cp->provider->sectorsize);
207 error = 0;
208
209 for (; off < offset; off += maxio, p += maxio, size -= maxio) {
210 bzero(bp, sizeof(*bp));
211 bp->bio_cmd = cmd;
212 bp->bio_done = NULL;
213 bp->bio_offset = off;
214 bp->bio_length = MIN(size, maxio);
215 bp->bio_data = p;
216 g_io_request(bp, cp);
217 error = biowait(bp, "vdev_geom_io");
218 if (error != 0)
219 break;
220 }
221
222 g_destroy_bio(bp);
223 return (error);
224}
225
226static uint64_t
227vdev_geom_read_guid(struct g_consumer *cp)
228{
229 struct g_provider *pp;
230 vdev_label_t *label;
231 char *p, *buf;
232 size_t buflen;
233 uint64_t psize;
234 off_t offset, size;
235 uint64_t guid;
236 int error, l, len;
237
238 g_topology_assert_not();
239
240 pp = cp->provider;
241 ZFS_LOG(1, "Reading guid from %s...", pp->name);
242
243 psize = pp->mediasize;
244 psize = P2ALIGN(psize, (uint64_t)sizeof(vdev_label_t));
245
246 size = sizeof(*label) + pp->sectorsize -
247 ((sizeof(*label) - 1) % pp->sectorsize) - 1;
248
249 guid = 0;
250 label = kmem_alloc(size, KM_SLEEP);
251 buflen = sizeof(label->vl_vdev_phys.vp_nvlist);
252
253 for (l = 0; l < VDEV_LABELS; l++) {
254 nvlist_t *config = NULL;
255
256 offset = vdev_label_offset(psize, l, 0);
257 if ((offset % pp->sectorsize) != 0)
258 continue;
259
260 if (vdev_geom_io(cp, BIO_READ, label, offset, size) != 0)
261 continue;
262 buf = label->vl_vdev_phys.vp_nvlist;
263
264 if (nvlist_unpack(buf, buflen, &config, 0) != 0)
265 continue;
266
267 guid = nvlist_get_guid(config);
268 nvlist_free(config);
269 if (guid != 0)
270 break;
271 }
272
273 kmem_free(label, size);
274 if (guid != 0)
275 ZFS_LOG(1, "guid for %s is %ju", pp->name, (uintmax_t)guid);
276 return (guid);
277}
278
279static void
280vdev_geom_taste_orphan(struct g_consumer *cp)
281{
282
283 KASSERT(1 == 0, ("%s called while tasting %s.", __func__,
284 cp->provider->name));
285}
286
287static struct g_consumer *
288vdev_geom_attach_by_guid(uint64_t guid)
289{
290 struct g_class *mp;
291 struct g_geom *gp, *zgp;
292 struct g_provider *pp;
293 struct g_consumer *cp, *zcp;
294 uint64_t pguid;
295
296 g_topology_assert();
297
298 zgp = g_new_geomf(&zfs_vdev_class, "zfs::vdev::taste");
299 /* This orphan function should be never called. */
300 zgp->orphan = vdev_geom_taste_orphan;
301 zcp = g_new_consumer(zgp);
302
303 cp = NULL;
304 LIST_FOREACH(mp, &g_classes, class) {
305 if (mp == &zfs_vdev_class)
306 continue;
307 LIST_FOREACH(gp, &mp->geom, geom) {
308 if (gp->flags & G_GEOM_WITHER)
309 continue;
310 LIST_FOREACH(pp, &gp->provider, provider) {
311 if (pp->flags & G_PF_WITHER)
312 continue;
313 g_attach(zcp, pp);
314 if (g_access(zcp, 1, 0, 0) != 0) {
315 g_detach(zcp);
316 continue;
317 }
318 g_topology_unlock();
319 pguid = vdev_geom_read_guid(zcp);
320 g_topology_lock();
321 g_access(zcp, -1, 0, 0);
322 g_detach(zcp);
323 if (pguid != guid)
324 continue;
325 cp = vdev_geom_attach(pp);
326 if (cp == NULL) {
327 printf("ZFS WARNING: Unable to attach to %s.\n",
328 pp->name);
329 continue;
330 }
331 break;
332 }
333 if (cp != NULL)
334 break;
335 }
336 if (cp != NULL)
337 break;
338 }
339end:
340 g_destroy_consumer(zcp);
341 g_destroy_geom(zgp);
342 return (cp);
343}
344
345static struct g_consumer *
346vdev_geom_open_by_guid(vdev_t *vd)
347{
348 struct g_consumer *cp;
349 char *buf;
350 size_t len;
351
352 g_topology_assert();
353
354 ZFS_LOG(1, "Searching by guid [%ju].", (uintmax_t)vd->vdev_guid);
355 cp = vdev_geom_attach_by_guid(vd->vdev_guid);
356 if (cp != NULL) {
357 len = strlen(cp->provider->name) + strlen("/dev/") + 1;
358 buf = kmem_alloc(len, KM_SLEEP);
359
360 snprintf(buf, len, "/dev/%s", cp->provider->name);
361 spa_strfree(vd->vdev_path);
362 vd->vdev_path = buf;
363
364 ZFS_LOG(1, "Attach by guid [%ju] succeeded, provider %s.",
365 (uintmax_t)vd->vdev_guid, vd->vdev_path);
366 } else {
367 ZFS_LOG(1, "Search by guid [%ju] failed.",
368 (uintmax_t)vd->vdev_guid);
369 }
370
371 return (cp);
372}
373
374static struct g_consumer *
375vdev_geom_open_by_path(vdev_t *vd, int check_guid)
376{
377 struct g_provider *pp;
378 struct g_consumer *cp;
379 uint64_t guid;
380
381 g_topology_assert();
382
383 cp = NULL;
384 pp = g_provider_by_name(vd->vdev_path + sizeof("/dev/") - 1);
385 if (pp != NULL) {
386 ZFS_LOG(1, "Found provider by name %s.", vd->vdev_path);
387 cp = vdev_geom_attach(pp);
388 if (cp != NULL && check_guid && ISP2(pp->sectorsize) &&
389 pp->sectorsize <= VDEV_PAD_SIZE) {
390 g_topology_unlock();
391 guid = vdev_geom_read_guid(cp);
392 g_topology_lock();
393 if (guid != vd->vdev_guid) {
394 vdev_geom_detach(cp, 0);
395 cp = NULL;
396 ZFS_LOG(1, "guid mismatch for provider %s: "
397 "%ju != %ju.", vd->vdev_path,
398 (uintmax_t)vd->vdev_guid, (uintmax_t)guid);
399 } else {
400 ZFS_LOG(1, "guid match for provider %s.",
401 vd->vdev_path);
402 }
403 }
404 }
405
406 return (cp);
407}
408
409static int
|
492
493 /*
494 * Determine the device's minimum transfer size.
495 */
496 *ashift = highbit(MAX(pp->sectorsize, SPA_MINBLOCKSIZE)) - 1;
497
498 /*
499 * Clear the nowritecache bit, so that on a vdev_reopen() we will
500 * try again.
501 */
502 vd->vdev_nowritecache = B_FALSE;
503
504 if (vd->vdev_physpath != NULL)
505 spa_strfree(vd->vdev_physpath);
506 bufsize = sizeof("/dev/") + strlen(pp->name);
507 vd->vdev_physpath = kmem_alloc(bufsize, KM_SLEEP);
508 snprintf(vd->vdev_physpath, bufsize, "/dev/%s", pp->name);
509
510 return (0);
511}
512
513static void
514vdev_geom_close(vdev_t *vd)
515{
516 struct g_consumer *cp;
517
518 cp = vd->vdev_tsd;
519 if (cp == NULL)
520 return;
521 vd->vdev_tsd = NULL;
522 vd->vdev_delayed_close = B_FALSE;
523 g_post_event(vdev_geom_detach, cp, M_WAITOK, NULL);
524}
525
526static void
527vdev_geom_io_intr(struct bio *bp)
528{
529 vdev_t *vd;
530 zio_t *zio;
531
532 zio = bp->bio_caller1;
533 vd = zio->io_vd;
534 zio->io_error = bp->bio_error;
535 if (zio->io_error == 0 && bp->bio_resid != 0)
536 zio->io_error = EIO;
537 if (bp->bio_cmd == BIO_FLUSH && bp->bio_error == ENOTSUP) {
538 /*
539 * If we get ENOTSUP, we know that no future
540 * attempts will ever succeed. In this case we
541 * set a persistent bit so that we don't bother
542 * with the ioctl in the future.
543 */
544 vd->vdev_nowritecache = B_TRUE;
545 }
546 if (zio->io_error == EIO && !vd->vdev_remove_wanted) {
547 /*
548 * If provider's error is set we assume it is being
549 * removed.
550 */
551 if (bp->bio_to->error != 0) {
552 /*
553 * We post the resource as soon as possible, instead of
554 * when the async removal actually happens, because the
555 * DE is using this information to discard previous I/O
556 * errors.
557 */
558 /* XXX: zfs_post_remove() can sleep. */
559 zfs_post_remove(zio->io_spa, vd);
560 vd->vdev_remove_wanted = B_TRUE;
561 spa_async_request(zio->io_spa, SPA_ASYNC_REMOVE);
562 } else if (!vd->vdev_delayed_close) {
563 vd->vdev_delayed_close = B_TRUE;
564 }
565 }
566 g_destroy_bio(bp);
567 zio_interrupt(zio);
568}
569
570static int
571vdev_geom_io_start(zio_t *zio)
572{
573 vdev_t *vd;
574 struct g_consumer *cp;
575 struct bio *bp;
576 int error;
577
578 vd = zio->io_vd;
579
580 if (zio->io_type == ZIO_TYPE_IOCTL) {
581 /* XXPOLICY */
582 if (!vdev_readable(vd)) {
583 zio->io_error = ENXIO;
584 return (ZIO_PIPELINE_CONTINUE);
585 }
586
587 switch (zio->io_cmd) {
588
589 case DKIOCFLUSHWRITECACHE:
590
591 if (zfs_nocacheflush || vdev_geom_bio_flush_disable)
592 break;
593
594 if (vd->vdev_nowritecache) {
595 zio->io_error = ENOTSUP;
596 break;
597 }
598
599 goto sendreq;
600 default:
601 zio->io_error = ENOTSUP;
602 }
603
604 return (ZIO_PIPELINE_CONTINUE);
605 }
606sendreq:
607 cp = vd->vdev_tsd;
608 if (cp == NULL) {
609 zio->io_error = ENXIO;
610 return (ZIO_PIPELINE_CONTINUE);
611 }
612 bp = g_alloc_bio();
613 bp->bio_caller1 = zio;
614 switch (zio->io_type) {
615 case ZIO_TYPE_READ:
616 case ZIO_TYPE_WRITE:
617 bp->bio_cmd = zio->io_type == ZIO_TYPE_READ ? BIO_READ : BIO_WRITE;
618 bp->bio_data = zio->io_data;
619 bp->bio_offset = zio->io_offset;
620 bp->bio_length = zio->io_size;
621 break;
622 case ZIO_TYPE_IOCTL:
623 bp->bio_cmd = BIO_FLUSH;
624 bp->bio_flags |= BIO_ORDERED;
625 bp->bio_data = NULL;
626 bp->bio_offset = cp->provider->mediasize;
627 bp->bio_length = 0;
628 break;
629 }
630 bp->bio_done = vdev_geom_io_intr;
631
632 g_io_request(bp, cp);
633
634 return (ZIO_PIPELINE_STOP);
635}
636
637static void
638vdev_geom_io_done(zio_t *zio)
639{
640}
641
642static void
643vdev_geom_hold(vdev_t *vd)
644{
645}
646
647static void
648vdev_geom_rele(vdev_t *vd)
649{
650}
651
652vdev_ops_t vdev_geom_ops = {
653 vdev_geom_open,
654 vdev_geom_close,
655 vdev_default_asize,
656 vdev_geom_io_start,
657 vdev_geom_io_done,
658 NULL,
659 vdev_geom_hold,
660 vdev_geom_rele,
661 VDEV_TYPE_DISK, /* name of this vdev type */
662 B_TRUE /* leaf vdev */
663};
| 495
496 /*
497 * Determine the device's minimum transfer size.
498 */
499 *ashift = highbit(MAX(pp->sectorsize, SPA_MINBLOCKSIZE)) - 1;
500
501 /*
502 * Clear the nowritecache bit, so that on a vdev_reopen() we will
503 * try again.
504 */
505 vd->vdev_nowritecache = B_FALSE;
506
507 if (vd->vdev_physpath != NULL)
508 spa_strfree(vd->vdev_physpath);
509 bufsize = sizeof("/dev/") + strlen(pp->name);
510 vd->vdev_physpath = kmem_alloc(bufsize, KM_SLEEP);
511 snprintf(vd->vdev_physpath, bufsize, "/dev/%s", pp->name);
512
513 return (0);
514}
515
516static void
517vdev_geom_close(vdev_t *vd)
518{
519 struct g_consumer *cp;
520
521 cp = vd->vdev_tsd;
522 if (cp == NULL)
523 return;
524 vd->vdev_tsd = NULL;
525 vd->vdev_delayed_close = B_FALSE;
526 g_post_event(vdev_geom_detach, cp, M_WAITOK, NULL);
527}
528
529static void
530vdev_geom_io_intr(struct bio *bp)
531{
532 vdev_t *vd;
533 zio_t *zio;
534
535 zio = bp->bio_caller1;
536 vd = zio->io_vd;
537 zio->io_error = bp->bio_error;
538 if (zio->io_error == 0 && bp->bio_resid != 0)
539 zio->io_error = EIO;
540 if (bp->bio_cmd == BIO_FLUSH && bp->bio_error == ENOTSUP) {
541 /*
542 * If we get ENOTSUP, we know that no future
543 * attempts will ever succeed. In this case we
544 * set a persistent bit so that we don't bother
545 * with the ioctl in the future.
546 */
547 vd->vdev_nowritecache = B_TRUE;
548 }
549 if (zio->io_error == EIO && !vd->vdev_remove_wanted) {
550 /*
551 * If provider's error is set we assume it is being
552 * removed.
553 */
554 if (bp->bio_to->error != 0) {
555 /*
556 * We post the resource as soon as possible, instead of
557 * when the async removal actually happens, because the
558 * DE is using this information to discard previous I/O
559 * errors.
560 */
561 /* XXX: zfs_post_remove() can sleep. */
562 zfs_post_remove(zio->io_spa, vd);
563 vd->vdev_remove_wanted = B_TRUE;
564 spa_async_request(zio->io_spa, SPA_ASYNC_REMOVE);
565 } else if (!vd->vdev_delayed_close) {
566 vd->vdev_delayed_close = B_TRUE;
567 }
568 }
569 g_destroy_bio(bp);
570 zio_interrupt(zio);
571}
572
573static int
574vdev_geom_io_start(zio_t *zio)
575{
576 vdev_t *vd;
577 struct g_consumer *cp;
578 struct bio *bp;
579 int error;
580
581 vd = zio->io_vd;
582
583 if (zio->io_type == ZIO_TYPE_IOCTL) {
584 /* XXPOLICY */
585 if (!vdev_readable(vd)) {
586 zio->io_error = ENXIO;
587 return (ZIO_PIPELINE_CONTINUE);
588 }
589
590 switch (zio->io_cmd) {
591
592 case DKIOCFLUSHWRITECACHE:
593
594 if (zfs_nocacheflush || vdev_geom_bio_flush_disable)
595 break;
596
597 if (vd->vdev_nowritecache) {
598 zio->io_error = ENOTSUP;
599 break;
600 }
601
602 goto sendreq;
603 default:
604 zio->io_error = ENOTSUP;
605 }
606
607 return (ZIO_PIPELINE_CONTINUE);
608 }
609sendreq:
610 cp = vd->vdev_tsd;
611 if (cp == NULL) {
612 zio->io_error = ENXIO;
613 return (ZIO_PIPELINE_CONTINUE);
614 }
615 bp = g_alloc_bio();
616 bp->bio_caller1 = zio;
617 switch (zio->io_type) {
618 case ZIO_TYPE_READ:
619 case ZIO_TYPE_WRITE:
620 bp->bio_cmd = zio->io_type == ZIO_TYPE_READ ? BIO_READ : BIO_WRITE;
621 bp->bio_data = zio->io_data;
622 bp->bio_offset = zio->io_offset;
623 bp->bio_length = zio->io_size;
624 break;
625 case ZIO_TYPE_IOCTL:
626 bp->bio_cmd = BIO_FLUSH;
627 bp->bio_flags |= BIO_ORDERED;
628 bp->bio_data = NULL;
629 bp->bio_offset = cp->provider->mediasize;
630 bp->bio_length = 0;
631 break;
632 }
633 bp->bio_done = vdev_geom_io_intr;
634
635 g_io_request(bp, cp);
636
637 return (ZIO_PIPELINE_STOP);
638}
639
640static void
641vdev_geom_io_done(zio_t *zio)
642{
643}
644
645static void
646vdev_geom_hold(vdev_t *vd)
647{
648}
649
650static void
651vdev_geom_rele(vdev_t *vd)
652{
653}
654
655vdev_ops_t vdev_geom_ops = {
656 vdev_geom_open,
657 vdev_geom_close,
658 vdev_default_asize,
659 vdev_geom_io_start,
660 vdev_geom_io_done,
661 NULL,
662 vdev_geom_hold,
663 vdev_geom_rele,
664 VDEV_TYPE_DISK, /* name of this vdev type */
665 B_TRUE /* leaf vdev */
666};
|