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 (C) 2008-2010 Lawrence Livermore National Security, LLC.
23 * Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
24 * Rewritten for Linux by Brian Behlendorf <behlendorf1@llnl.gov>.
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.
39 typedef struct dio_request {
40 struct completion dr_comp; /* Completion for sync IO */
41 atomic_t dr_ref; /* References */
42 zio_t *dr_zio; /* Parent ZIO */
43 int dr_rw; /* Read/Write */
44 int dr_error; /* Bio error */
45 int dr_bio_count; /* Count of bio's */
46 struct bio *dr_bio[0]; /* Attached bio's */
50 #ifdef HAVE_OPEN_BDEV_EXCLUSIVE
52 vdev_bdev_mode(int smode)
56 ASSERT3S(smode & (FREAD | FWRITE), !=, 0);
68 vdev_bdev_mode(int smode)
72 ASSERT3S(smode & (FREAD | FWRITE), !=, 0);
74 if ((smode & FREAD) && !(smode & FWRITE))
79 #endif /* HAVE_OPEN_BDEV_EXCLUSIVE */
82 bdev_capacity(struct block_device *bdev)
84 struct hd_struct *part = bdev->bd_part;
86 /* The partition capacity referenced by the block device */
88 return part->nr_sects;
90 /* Otherwise assume the full device capacity */
91 return get_capacity(bdev->bd_disk);
95 vdev_disk_error(zio_t *zio)
98 printk("ZFS: zio error=%d type=%d offset=%llu "
99 "size=%llu flags=%x\n", zio->io_error, zio->io_type,
100 (u_longlong_t)zio->io_offset, (u_longlong_t)zio->io_size,
106 vdev_disk_open(vdev_t *v, uint64_t *psize, uint64_t *ashift)
108 struct block_device *bdev;
110 int mode, block_size;
112 /* Must have a pathname and it must be absolute. */
113 if (v->vdev_path == NULL || v->vdev_path[0] != '/') {
114 v->vdev_stat.vs_aux = VDEV_AUX_BAD_LABEL;
118 vd = kmem_zalloc(sizeof(vdev_disk_t), KM_SLEEP);
123 * Devices are always opened by the path provided at configuration
124 * time. This means that if the provided path is a udev by-id path
125 * then drives may be recabled without an issue. If the provided
126 * path is a udev by-path path then the physical location information
127 * will be preserved. This can be critical for more complicated
128 * configurations where drives are located in specific physical
129 * locations to maximize the systems tolerence to component failure.
130 * Alternately you can provide your own udev rule to flexibly map
131 * the drives as you see fit. It is not advised that you use the
132 * /dev/[hd]d devices which may be reorder due to probing order.
133 * Devices in the wrong locations will be detected by the higher
134 * level vdev validation.
136 mode = spa_mode(v->vdev_spa);
137 bdev = vdev_bdev_open(v->vdev_path, vdev_bdev_mode(mode), vd);
139 kmem_free(vd, sizeof(vdev_disk_t));
140 return -PTR_ERR(bdev);
145 block_size = vdev_bdev_block_size(bdev);
147 /* We think the wholedisk property should always be set when this
148 * function is called. ASSERT here so if any legitimate cases exist
149 * where it's not set, we'll find them during debugging. If we never
150 * hit the ASSERT, this and the following conditional statement can be
152 ASSERT3S(v->vdev_wholedisk, !=, -1ULL);
154 /* The wholedisk property was initialized to -1 in vdev_alloc() if it
155 * was unspecified. In that case, check if this is a whole device.
156 * When bdev->bd_contains == bdev we have a whole device and not simply
158 if (v->vdev_wholedisk == -1ULL)
159 v->vdev_wholedisk = (bdev->bd_contains == bdev);
161 /* Clear the nowritecache bit, causes vdev_reopen() to try again. */
162 v->vdev_nowritecache = B_FALSE;
164 /* Physical volume size in bytes */
165 *psize = bdev_capacity(bdev) * block_size;
167 /* Based on the minimum sector size set the block size */
168 *ashift = highbit(MAX(block_size, SPA_MINBLOCKSIZE)) - 1;
174 vdev_disk_close(vdev_t *v)
176 vdev_disk_t *vd = v->vdev_tsd;
181 if (vd->vd_bdev != NULL)
182 vdev_bdev_close(vd->vd_bdev,
183 vdev_bdev_mode(spa_mode(v->vdev_spa)));
185 kmem_free(vd, sizeof(vdev_disk_t));
189 static dio_request_t *
190 vdev_disk_dio_alloc(int bio_count)
195 dr = kmem_zalloc(sizeof(dio_request_t) +
196 sizeof(struct bio *) * bio_count, KM_SLEEP);
198 init_completion(&dr->dr_comp);
199 atomic_set(&dr->dr_ref, 0);
200 dr->dr_bio_count = bio_count;
203 for (i = 0; i < dr->dr_bio_count; i++)
204 dr->dr_bio[i] = NULL;
211 vdev_disk_dio_free(dio_request_t *dr)
215 for (i = 0; i < dr->dr_bio_count; i++)
217 bio_put(dr->dr_bio[i]);
219 kmem_free(dr, sizeof(dio_request_t) +
220 sizeof(struct bio *) * dr->dr_bio_count);
224 vdev_disk_dio_get(dio_request_t *dr)
226 atomic_inc(&dr->dr_ref);
230 vdev_disk_dio_put(dio_request_t *dr)
232 int rc = atomic_dec_return(&dr->dr_ref);
235 * Free the dio_request when the last reference is dropped and
236 * ensure zio_interpret is called only once with the correct zio
239 zio_t *zio = dr->dr_zio;
240 int error = dr->dr_error;
242 vdev_disk_dio_free(dr);
245 zio->io_error = error;
246 ASSERT3S(zio->io_error, >=, 0);
248 vdev_disk_error(zio);
256 BIO_END_IO_PROTO(vdev_disk_physio_completion, bio, size, error)
258 dio_request_t *dr = bio->bi_private;
261 /* Fatal error but print some useful debugging before asserting */
263 PANIC("dr == NULL, bio->bi_private == NULL\n"
264 "bi_next: %p, bi_flags: %lx, bi_rw: %lu, bi_vcnt: %d\n"
265 "bi_idx: %d, bi_size: %d, bi_end_io: %p, bi_cnt: %d\n",
266 bio->bi_next, bio->bi_flags, bio->bi_rw, bio->bi_vcnt,
267 bio->bi_idx, bio->bi_size, bio->bi_end_io,
268 atomic_read(&bio->bi_cnt));
270 #ifndef HAVE_2ARGS_BIO_END_IO_T
273 #endif /* HAVE_2ARGS_BIO_END_IO_T */
275 if (error == 0 && !test_bit(BIO_UPTODATE, &bio->bi_flags))
278 if (dr->dr_error == 0)
279 dr->dr_error = -error;
281 /* Drop reference aquired by __vdev_disk_physio */
282 rc = vdev_disk_dio_put(dr);
284 /* Wake up synchronous waiter this is the last outstanding bio */
285 if ((rc == 1) && (dr->dr_rw & (1 << DIO_RW_SYNCIO)))
286 complete(&dr->dr_comp);
288 BIO_END_IO_RETURN(0);
291 static inline unsigned long
292 bio_nr_pages(void *bio_ptr, unsigned int bio_size)
294 return ((((unsigned long)bio_ptr + bio_size + PAGE_SIZE - 1) >>
295 PAGE_SHIFT) - ((unsigned long)bio_ptr >> PAGE_SHIFT));
299 bio_map(struct bio *bio, void *bio_ptr, unsigned int bio_size)
301 unsigned int offset, size, i;
304 offset = offset_in_page(bio_ptr);
305 for (i = 0; i < bio->bi_max_vecs; i++) {
306 size = PAGE_SIZE - offset;
314 if (kmem_virt(bio_ptr))
315 page = vmalloc_to_page(bio_ptr);
317 page = virt_to_page(bio_ptr);
319 if (bio_add_page(bio, page, size, offset) != size)
331 __vdev_disk_physio(struct block_device *bdev, zio_t *zio, caddr_t kbuf_ptr,
332 size_t kbuf_size, uint64_t kbuf_offset, int flags)
337 int bio_size, bio_count = 16;
338 int i = 0, error = 0, block_size;
341 dr = vdev_disk_dio_alloc(bio_count);
345 if (zio && !(zio->io_flags & (ZIO_FLAG_IO_RETRY | ZIO_FLAG_TRYHARD)))
346 bio_set_flags_failfast(bdev, &flags);
350 block_size = vdev_bdev_block_size(bdev);
353 * When the IO size exceeds the maximum bio size for the request
354 * queue we are forced to break the IO in multiple bio's and wait
355 * for them all to complete. Ideally, all pool users will set
356 * their volume block size to match the maximum request size and
357 * the common case will be one bio per vdev IO request.
360 bio_offset = kbuf_offset;
361 bio_size = kbuf_size;
362 for (i = 0; i <= dr->dr_bio_count; i++) {
364 /* Finished constructing bio's for given buffer */
369 * By default only 'bio_count' bio's per dio are allowed.
370 * However, if we find ourselves in a situation where more
371 * are needed we allocate a larger dio and warn the user.
373 if (dr->dr_bio_count == i) {
374 vdev_disk_dio_free(dr);
376 printk("WARNING: Resized bio's/dio to %d\n",bio_count);
380 dr->dr_bio[i] = bio_alloc(GFP_NOIO,
381 bio_nr_pages(bio_ptr, bio_size));
382 if (dr->dr_bio[i] == NULL) {
383 vdev_disk_dio_free(dr);
387 /* Matching put called by vdev_disk_physio_completion */
388 vdev_disk_dio_get(dr);
390 dr->dr_bio[i]->bi_bdev = bdev;
391 dr->dr_bio[i]->bi_sector = bio_offset / block_size;
392 dr->dr_bio[i]->bi_rw = dr->dr_rw;
393 dr->dr_bio[i]->bi_end_io = vdev_disk_physio_completion;
394 dr->dr_bio[i]->bi_private = dr;
396 /* Remaining size is returned to become the new size */
397 bio_size = bio_map(dr->dr_bio[i], bio_ptr, bio_size);
399 /* Advance in buffer and construct another bio if needed */
400 bio_ptr += dr->dr_bio[i]->bi_size;
401 bio_offset += dr->dr_bio[i]->bi_size;
404 /* Extra reference to protect dio_request during submit_bio */
405 vdev_disk_dio_get(dr);
407 /* Submit all bio's associated with this dio */
408 for (i = 0; i < dr->dr_bio_count; i++)
410 submit_bio(dr->dr_rw, dr->dr_bio[i]);
413 * On synchronous blocking requests we wait for all bio the completion
414 * callbacks to run. We will be woken when the last callback runs
415 * for this dio. We are responsible for putting the last dio_request
416 * reference will in turn put back the last bio references. The
417 * only synchronous consumer is vdev_disk_read_rootlabel() all other
418 * IO originating from vdev_disk_io_start() is asynchronous.
420 if (dr->dr_rw & (1 << DIO_RW_SYNCIO)) {
421 wait_for_completion(&dr->dr_comp);
422 error = dr->dr_error;
423 ASSERT3S(atomic_read(&dr->dr_ref), ==, 1);
426 (void)vdev_disk_dio_put(dr);
432 vdev_disk_physio(struct block_device *bdev, caddr_t kbuf,
433 size_t size, uint64_t offset, int flags)
435 bio_set_flags_failfast(bdev, &flags);
436 return __vdev_disk_physio(bdev, NULL, kbuf, size, offset, flags);
439 /* 2.6.24 API change */
440 #ifdef HAVE_BIO_EMPTY_BARRIER
441 BIO_END_IO_PROTO(vdev_disk_io_flush_completion, bio, size, rc)
443 zio_t *zio = bio->bi_private;
446 if (rc && (rc == -EOPNOTSUPP))
447 zio->io_vd->vdev_nowritecache = B_TRUE;
450 ASSERT3S(zio->io_error, >=, 0);
452 vdev_disk_error(zio);
455 BIO_END_IO_RETURN(0);
459 vdev_disk_io_flush(struct block_device *bdev, zio_t *zio)
461 struct request_queue *q;
464 q = bdev_get_queue(bdev);
468 bio = bio_alloc(GFP_KERNEL, 0);
472 bio->bi_end_io = vdev_disk_io_flush_completion;
473 bio->bi_private = zio;
475 submit_bio(WRITE_BARRIER, bio);
481 vdev_disk_io_flush(struct block_device *bdev, zio_t *zio)
485 #endif /* HAVE_BIO_EMPTY_BARRIER */
488 vdev_disk_io_start(zio_t *zio)
490 vdev_t *v = zio->io_vd;
491 vdev_disk_t *vd = v->vdev_tsd;
494 switch (zio->io_type) {
497 if (!vdev_readable(v)) {
498 zio->io_error = ENXIO;
499 return ZIO_PIPELINE_CONTINUE;
502 switch (zio->io_cmd) {
503 case DKIOCFLUSHWRITECACHE:
505 if (zfs_nocacheflush)
508 if (v->vdev_nowritecache) {
509 zio->io_error = ENOTSUP;
513 error = vdev_disk_io_flush(vd->vd_bdev, zio);
515 return ZIO_PIPELINE_STOP;
517 zio->io_error = error;
518 if (error == ENOTSUP)
519 v->vdev_nowritecache = B_TRUE;
524 zio->io_error = ENOTSUP;
527 return ZIO_PIPELINE_CONTINUE;
538 zio->io_error = ENOTSUP;
539 return ZIO_PIPELINE_CONTINUE;
542 error = __vdev_disk_physio(vd->vd_bdev, zio, zio->io_data,
543 zio->io_size, zio->io_offset, flags);
545 zio->io_error = error;
546 return ZIO_PIPELINE_CONTINUE;
549 return ZIO_PIPELINE_STOP;
553 vdev_disk_io_done(zio_t *zio)
556 * If the device returned EIO, we revalidate the media. If it is
557 * determined the media has changed this triggers the asynchronous
558 * removal of the device from the configuration.
560 if (zio->io_error == EIO) {
561 vdev_t *v = zio->io_vd;
562 vdev_disk_t *vd = v->vdev_tsd;
564 if (check_disk_change(vd->vd_bdev)) {
565 vdev_bdev_invalidate(vd->vd_bdev);
566 v->vdev_remove_wanted = B_TRUE;
567 spa_async_request(zio->io_spa, SPA_ASYNC_REMOVE);
573 vdev_disk_hold(vdev_t *vd)
575 ASSERT(spa_config_held(vd->vdev_spa, SCL_STATE, RW_WRITER));
577 /* We must have a pathname, and it must be absolute. */
578 if (vd->vdev_path == NULL || vd->vdev_path[0] != '/')
582 * Only prefetch path and devid info if the device has
585 if (vd->vdev_tsd != NULL)
588 /* XXX: Implement me as a vnode lookup for the device */
589 vd->vdev_name_vp = NULL;
590 vd->vdev_devid_vp = NULL;
594 vdev_disk_rele(vdev_t *vd)
596 ASSERT(spa_config_held(vd->vdev_spa, SCL_STATE, RW_WRITER));
598 /* XXX: Implement me as a vnode rele for the device */
601 vdev_ops_t vdev_disk_ops = {
610 VDEV_TYPE_DISK, /* name of this vdev type */
611 B_TRUE /* leaf vdev */
615 * Given the root disk device devid or pathname, read the label from
616 * the device, and construct a configuration nvlist.
619 vdev_disk_read_rootlabel(char *devpath, char *devid, nvlist_t **config)
621 struct block_device *bdev;
626 bdev = vdev_bdev_open(devpath, vdev_bdev_mode(FREAD), NULL);
628 return -PTR_ERR(bdev);
630 s = bdev_capacity(bdev) * vdev_bdev_block_size(bdev);
632 vdev_bdev_close(bdev, vdev_bdev_mode(FREAD));
636 size = P2ALIGN_TYPED(s, sizeof(vdev_label_t), uint64_t);
637 label = vmem_alloc(sizeof(vdev_label_t), KM_SLEEP);
639 for (i = 0; i < VDEV_LABELS; i++) {
640 uint64_t offset, state, txg = 0;
642 /* read vdev label */
643 offset = vdev_label_offset(size, i, 0);
644 if (vdev_disk_physio(bdev, (caddr_t)label,
645 VDEV_SKIP_SIZE + VDEV_PHYS_SIZE, offset, READ_SYNC) != 0)
648 if (nvlist_unpack(label->vl_vdev_phys.vp_nvlist,
649 sizeof (label->vl_vdev_phys.vp_nvlist), config, 0) != 0) {
654 if (nvlist_lookup_uint64(*config, ZPOOL_CONFIG_POOL_STATE,
655 &state) != 0 || state >= POOL_STATE_DESTROYED) {
656 nvlist_free(*config);
661 if (nvlist_lookup_uint64(*config, ZPOOL_CONFIG_POOL_TXG,
662 &txg) != 0 || txg == 0) {
663 nvlist_free(*config);
671 vmem_free(label, sizeof(vdev_label_t));
672 vdev_bdev_close(bdev, vdev_bdev_mode(FREAD));