* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
- * or http://www.opensolaris.org/os/licensing.
+ * or https://opensource.org/licenses/CDDL-1.0.
* See the License for the specific language governing permissions
* and limitations under the License.
*
#include <sys/dsl_pool.h>
#include <sys/dsl_scan.h>
#include <sys/vdev_impl.h>
+#include <sys/vdev_draid.h>
#include <sys/zio.h>
+#include <sys/zio_checksum.h>
#include <sys/abd.h>
#include <sys/fs/zfs.h>
/*
* Virtual device vector for mirroring.
*/
-
typedef struct mirror_child {
vdev_t *mc_vd;
+ abd_t *mc_abd;
uint64_t mc_offset;
int mc_error;
int mc_load;
uint8_t mc_tried;
uint8_t mc_skipped;
uint8_t mc_speculative;
+ uint8_t mc_rebuilding;
} mirror_child_t;
typedef struct mirror_map {
int mm_preferred_cnt;
int mm_children;
boolean_t mm_resilvering;
+ boolean_t mm_rebuilding;
boolean_t mm_root;
mirror_child_t mm_child[];
} mirror_map_t;
-static int vdev_mirror_shift = 21;
+static const int vdev_mirror_shift = 21;
/*
* The load configuration settings below are tuned by default for
static const zio_vsd_ops_t vdev_mirror_vsd_ops = {
.vsd_free = vdev_mirror_map_free,
- .vsd_cksum_report = zio_vsd_default_cksum_report
};
static int
return (load + zfs_vdev_mirror_rotating_seek_inc);
}
+static boolean_t
+vdev_mirror_rebuilding(vdev_t *vd)
+{
+ if (vd->vdev_ops->vdev_op_leaf && vd->vdev_rebuild_txg)
+ return (B_TRUE);
+
+ for (int i = 0; i < vd->vdev_children; i++) {
+ if (vdev_mirror_rebuilding(vd->vdev_child[i])) {
+ return (B_TRUE);
+ }
+ }
+
+ return (B_FALSE);
+}
+
/*
* Avoid inlining the function to keep vdev_mirror_io_start(), which
* is this functions only caller, as small as possible on the stack.
mc = &mm->mm_child[c];
mc->mc_vd = vd->vdev_child[c];
mc->mc_offset = zio->io_offset;
+
+ if (vdev_mirror_rebuilding(mc->mc_vd))
+ mm->mm_rebuilding = mc->mc_rebuilding = B_TRUE;
}
}
- zio->io_vsd = mm;
- zio->io_vsd_ops = &vdev_mirror_vsd_ops;
return (mm);
}
static int
vdev_mirror_open(vdev_t *vd, uint64_t *asize, uint64_t *max_asize,
- uint64_t *ashift)
+ uint64_t *logical_ashift, uint64_t *physical_ashift)
{
int numerrors = 0;
int lasterror = 0;
*asize = MIN(*asize - 1, cvd->vdev_asize - 1) + 1;
*max_asize = MIN(*max_asize - 1, cvd->vdev_max_asize - 1) + 1;
- *ashift = MAX(*ashift, cvd->vdev_ashift);
+ *logical_ashift = MAX(*logical_ashift, cvd->vdev_ashift);
+ }
+ for (int c = 0; c < vd->vdev_children; c++) {
+ vdev_t *cvd = vd->vdev_child[c];
+
+ if (cvd->vdev_open_error)
+ continue;
+ *physical_ashift = vdev_best_ashift(*logical_ashift,
+ *physical_ashift, cvd->vdev_physical_ashift);
}
if (numerrors == vd->vdev_children) {
mc->mc_skipped = 0;
}
-static void
-vdev_mirror_scrub_done(zio_t *zio)
-{
- mirror_child_t *mc = zio->io_private;
-
- if (zio->io_error == 0) {
- zio_t *pio;
- zio_link_t *zl = NULL;
-
- mutex_enter(&zio->io_lock);
- while ((pio = zio_walk_parents(zio, &zl)) != NULL) {
- mutex_enter(&pio->io_lock);
- ASSERT3U(zio->io_size, >=, pio->io_size);
- abd_copy(pio->io_abd, zio->io_abd, pio->io_size);
- mutex_exit(&pio->io_lock);
- }
- mutex_exit(&zio->io_lock);
- }
-
- abd_free(zio->io_abd);
-
- mc->mc_error = zio->io_error;
- mc->mc_tried = 1;
- mc->mc_skipped = 0;
-}
-
/*
* Check the other, lower-index DVAs to see if they're on the same
* vdev as the child we picked. If they are, use them since they
int p;
if (mm->mm_root) {
- p = spa_get_random(mm->mm_preferred_cnt);
+ p = random_in_range(mm->mm_preferred_cnt);
return (vdev_mirror_dva_select(zio, p));
}
return (mm->mm_preferred[p]);
}
+static boolean_t
+vdev_mirror_child_readable(mirror_child_t *mc)
+{
+ vdev_t *vd = mc->mc_vd;
+
+ if (vd->vdev_top != NULL && vd->vdev_top->vdev_ops == &vdev_draid_ops)
+ return (vdev_draid_readable(vd, mc->mc_offset));
+ else
+ return (vdev_readable(vd));
+}
+
+static boolean_t
+vdev_mirror_child_missing(mirror_child_t *mc, uint64_t txg, uint64_t size)
+{
+ vdev_t *vd = mc->mc_vd;
+
+ if (vd->vdev_top != NULL && vd->vdev_top->vdev_ops == &vdev_draid_ops)
+ return (vdev_draid_missing(vd, mc->mc_offset, txg, size));
+ else
+ return (vdev_dtl_contains(vd, DTL_MISSING, txg, size));
+}
+
/*
* Try to find a vdev whose DTL doesn't contain the block we want to read
- * preferring vdevs based on determined load.
+ * preferring vdevs based on determined load. If we can't, try the read on
+ * any vdev we haven't already tried.
*
- * Try to find a child whose DTL doesn't contain the block we want to read.
- * If we can't, try the read on any vdev we haven't already tried.
+ * Distributed spares are an exception to the above load rule. They are
+ * always preferred in order to detect gaps in the distributed spare which
+ * are created when another disk in the dRAID fails. In order to restore
+ * redundancy those gaps must be read to trigger the required repair IO.
*/
static int
vdev_mirror_child_select(zio_t *zio)
uint64_t txg = zio->io_txg;
int c, lowest_load;
- ASSERT(zio->io_bp == NULL || BP_PHYSICAL_BIRTH(zio->io_bp) == txg);
+ ASSERT(zio->io_bp == NULL || BP_GET_BIRTH(zio->io_bp) == txg);
lowest_load = INT_MAX;
mm->mm_preferred_cnt = 0;
if (mc->mc_tried || mc->mc_skipped)
continue;
- if (mc->mc_vd == NULL || !vdev_readable(mc->mc_vd)) {
+ if (mc->mc_vd == NULL ||
+ !vdev_mirror_child_readable(mc)) {
mc->mc_error = SET_ERROR(ENXIO);
mc->mc_tried = 1; /* don't even try */
mc->mc_skipped = 1;
continue;
}
- if (vdev_dtl_contains(mc->mc_vd, DTL_MISSING, txg, 1)) {
+ if (vdev_mirror_child_missing(mc, txg, 1)) {
mc->mc_error = SET_ERROR(ESTALE);
mc->mc_skipped = 1;
mc->mc_speculative = 1;
continue;
}
+ if (mc->mc_vd->vdev_ops == &vdev_draid_spare_ops) {
+ mm->mm_preferred[0] = c;
+ mm->mm_preferred_cnt = 1;
+ break;
+ }
+
mc->mc_load = vdev_mirror_load(mm, mc->mc_vd, mc->mc_offset);
if (mc->mc_load > lowest_load)
continue;
int c, children;
mm = vdev_mirror_map_init(zio);
+ zio->io_vsd = mm;
+ zio->io_vsd_ops = &vdev_mirror_vsd_ops;
if (mm == NULL) {
ASSERT(!spa_trust_config(zio->io_spa));
}
if (zio->io_type == ZIO_TYPE_READ) {
- if (zio->io_bp != NULL &&
- (zio->io_flags & ZIO_FLAG_SCRUB) && !mm->mm_resilvering) {
+ if ((zio->io_flags & ZIO_FLAG_SCRUB) && !mm->mm_resilvering) {
/*
- * For scrubbing reads (if we can verify the
- * checksum here, as indicated by io_bp being
- * non-NULL) we need to allocate a read buffer for
- * each child and issue reads to all children. If
- * any child succeeds, it will copy its data into
- * zio->io_data in vdev_mirror_scrub_done.
+ * For scrubbing reads we need to issue reads to all
+ * children. One child can reuse parent buffer, but
+ * for others we have to allocate separate ones to
+ * verify checksums if io_bp is non-NULL, or compare
+ * them in vdev_mirror_io_done() otherwise.
*/
+ boolean_t first = B_TRUE;
for (c = 0; c < mm->mm_children; c++) {
mc = &mm->mm_child[c];
- zio_nowait(zio_vdev_child_io(zio, zio->io_bp,
- mc->mc_vd, mc->mc_offset,
+
+ /* Don't issue ZIOs to offline children */
+ if (!vdev_mirror_child_readable(mc)) {
+ mc->mc_error = SET_ERROR(ENXIO);
+ mc->mc_tried = 1;
+ mc->mc_skipped = 1;
+ continue;
+ }
+
+ mc->mc_abd = first ? zio->io_abd :
abd_alloc_sametype(zio->io_abd,
- zio->io_size), zio->io_size,
- zio->io_type, zio->io_priority, 0,
- vdev_mirror_scrub_done, mc));
+ zio->io_size);
+ zio_nowait(zio_vdev_child_io(zio, zio->io_bp,
+ mc->mc_vd, mc->mc_offset, mc->mc_abd,
+ zio->io_size, zio->io_type,
+ zio->io_priority, 0,
+ vdev_mirror_child_done, mc));
+ first = B_FALSE;
}
zio_execute(zio);
return;
while (children--) {
mc = &mm->mm_child[c];
+ c++;
+
+ /*
+ * When sequentially resilvering only issue write repair
+ * IOs to the vdev which is being rebuilt since performance
+ * is limited by the slowest child. This is an issue for
+ * faster replacement devices such as distributed spares.
+ */
+ if ((zio->io_priority == ZIO_PRIORITY_REBUILD) &&
+ (zio->io_flags & ZIO_FLAG_IO_REPAIR) &&
+ !(zio->io_flags & ZIO_FLAG_SCRUB) &&
+ mm->mm_rebuilding && !mc->mc_rebuilding) {
+ continue;
+ }
+
zio_nowait(zio_vdev_child_io(zio, zio->io_bp,
mc->mc_vd, mc->mc_offset, zio->io_abd, zio->io_size,
zio->io_type, zio->io_priority, 0,
vdev_mirror_child_done, mc));
- c++;
}
zio_execute(zio);
int c;
int good_copies = 0;
int unexpected_errors = 0;
+ int last_good_copy = -1;
if (mm == NULL)
return;
if (!mc->mc_skipped)
unexpected_errors++;
} else if (mc->mc_tried) {
+ last_good_copy = c;
good_copies++;
}
}
* no non-degraded top-level vdevs left, and not update DTLs
* if we intend to reallocate.
*/
- /* XXPOLICY */
if (good_copies != mm->mm_children) {
/*
* Always require at least one good copy.
/*
* If we don't have a good copy yet, keep trying other children.
*/
- /* XXPOLICY */
if (good_copies == 0 && (c = vdev_mirror_child_select(zio)) != -1) {
ASSERT(c >= 0 && c < mm->mm_children);
mc = &mm->mm_child[c];
return;
}
- /* XXPOLICY */
+ if (zio->io_flags & ZIO_FLAG_SCRUB && !mm->mm_resilvering) {
+ abd_t *best_abd = NULL;
+ if (last_good_copy >= 0)
+ best_abd = mm->mm_child[last_good_copy].mc_abd;
+
+ /*
+ * If we're scrubbing but don't have a BP available (because
+ * this vdev is under a raidz or draid vdev) then the best we
+ * can do is compare all of the copies read. If they're not
+ * identical then return a checksum error and the most likely
+ * correct data. The raidz code will issue a repair I/O if
+ * possible.
+ */
+ if (zio->io_bp == NULL) {
+ ASSERT(zio->io_vd->vdev_ops == &vdev_replacing_ops ||
+ zio->io_vd->vdev_ops == &vdev_spare_ops);
+
+ abd_t *pref_abd = NULL;
+ for (c = 0; c < last_good_copy; c++) {
+ mc = &mm->mm_child[c];
+ if (mc->mc_error || !mc->mc_tried)
+ continue;
+
+ if (abd_cmp(mc->mc_abd, best_abd) != 0)
+ zio->io_error = SET_ERROR(ECKSUM);
+
+ /*
+ * The distributed spare is always prefered
+ * by vdev_mirror_child_select() so it's
+ * considered to be the best candidate.
+ */
+ if (pref_abd == NULL &&
+ mc->mc_vd->vdev_ops ==
+ &vdev_draid_spare_ops)
+ pref_abd = mc->mc_abd;
+
+ /*
+ * In the absence of a preferred copy, use
+ * the parent pointer to avoid a memory copy.
+ */
+ if (mc->mc_abd == zio->io_abd)
+ best_abd = mc->mc_abd;
+ }
+ if (pref_abd)
+ best_abd = pref_abd;
+ } else {
+
+ /*
+ * If we have a BP available, then checksums are
+ * already verified and we just need a buffer
+ * with valid data, preferring parent one to
+ * avoid a memory copy.
+ */
+ for (c = 0; c < last_good_copy; c++) {
+ mc = &mm->mm_child[c];
+ if (mc->mc_error || !mc->mc_tried)
+ continue;
+ if (mc->mc_abd == zio->io_abd) {
+ best_abd = mc->mc_abd;
+ break;
+ }
+ }
+ }
+
+ if (best_abd && best_abd != zio->io_abd)
+ abd_copy(zio->io_abd, best_abd, zio->io_size);
+ for (c = 0; c < mm->mm_children; c++) {
+ mc = &mm->mm_child[c];
+ if (mc->mc_abd != zio->io_abd)
+ abd_free(mc->mc_abd);
+ mc->mc_abd = NULL;
+ }
+ }
+
if (good_copies == 0) {
zio->io_error = vdev_mirror_worst_error(mm);
ASSERT(zio->io_error != 0);
mc = &mm->mm_child[c];
if (mc->mc_error == 0) {
+ vdev_ops_t *ops = mc->mc_vd->vdev_ops;
+
if (mc->mc_tried)
continue;
/*
* 1. it's a scrub (in which case we have
* tried everything that was healthy)
* - or -
- * 2. it's an indirect vdev (in which case
- * it could point to any other vdev, which
- * might have a bad DTL)
+ * 2. it's an indirect or distributed spare
+ * vdev (in which case it could point to any
+ * other vdev, which might have a bad DTL)
* - or -
* 3. the DTL indicates that this data is
* missing from this vdev
*/
if (!(zio->io_flags & ZIO_FLAG_SCRUB) &&
- mc->mc_vd->vdev_ops != &vdev_indirect_ops &&
+ ops != &vdev_indirect_ops &&
+ ops != &vdev_draid_spare_ops &&
!vdev_dtl_contains(mc->mc_vd, DTL_PARTIAL,
zio->io_txg, 1))
continue;
}
}
+/*
+ * Return the maximum asize for a rebuild zio in the provided range.
+ */
+static uint64_t
+vdev_mirror_rebuild_asize(vdev_t *vd, uint64_t start, uint64_t asize,
+ uint64_t max_segment)
+{
+ (void) start;
+
+ uint64_t psize = MIN(P2ROUNDUP(max_segment, 1 << vd->vdev_ashift),
+ SPA_MAXBLOCKSIZE);
+
+ return (MIN(asize, vdev_psize_to_asize(vd, psize)));
+}
+
vdev_ops_t vdev_mirror_ops = {
+ .vdev_op_init = NULL,
+ .vdev_op_fini = NULL,
.vdev_op_open = vdev_mirror_open,
.vdev_op_close = vdev_mirror_close,
.vdev_op_asize = vdev_default_asize,
+ .vdev_op_min_asize = vdev_default_min_asize,
+ .vdev_op_min_alloc = NULL,
.vdev_op_io_start = vdev_mirror_io_start,
.vdev_op_io_done = vdev_mirror_io_done,
.vdev_op_state_change = vdev_mirror_state_change,
- .vdev_op_need_resilver = NULL,
+ .vdev_op_need_resilver = vdev_default_need_resilver,
.vdev_op_hold = NULL,
.vdev_op_rele = NULL,
.vdev_op_remap = NULL,
.vdev_op_xlate = vdev_default_xlate,
+ .vdev_op_rebuild_asize = vdev_mirror_rebuild_asize,
+ .vdev_op_metaslab_init = NULL,
+ .vdev_op_config_generate = NULL,
+ .vdev_op_nparity = NULL,
+ .vdev_op_ndisks = NULL,
.vdev_op_type = VDEV_TYPE_MIRROR, /* name of this vdev type */
.vdev_op_leaf = B_FALSE /* not a leaf vdev */
};
vdev_ops_t vdev_replacing_ops = {
+ .vdev_op_init = NULL,
+ .vdev_op_fini = NULL,
.vdev_op_open = vdev_mirror_open,
.vdev_op_close = vdev_mirror_close,
.vdev_op_asize = vdev_default_asize,
+ .vdev_op_min_asize = vdev_default_min_asize,
+ .vdev_op_min_alloc = NULL,
.vdev_op_io_start = vdev_mirror_io_start,
.vdev_op_io_done = vdev_mirror_io_done,
.vdev_op_state_change = vdev_mirror_state_change,
- .vdev_op_need_resilver = NULL,
+ .vdev_op_need_resilver = vdev_default_need_resilver,
.vdev_op_hold = NULL,
.vdev_op_rele = NULL,
.vdev_op_remap = NULL,
.vdev_op_xlate = vdev_default_xlate,
+ .vdev_op_rebuild_asize = vdev_mirror_rebuild_asize,
+ .vdev_op_metaslab_init = NULL,
+ .vdev_op_config_generate = NULL,
+ .vdev_op_nparity = NULL,
+ .vdev_op_ndisks = NULL,
.vdev_op_type = VDEV_TYPE_REPLACING, /* name of this vdev type */
.vdev_op_leaf = B_FALSE /* not a leaf vdev */
};
vdev_ops_t vdev_spare_ops = {
+ .vdev_op_init = NULL,
+ .vdev_op_fini = NULL,
.vdev_op_open = vdev_mirror_open,
.vdev_op_close = vdev_mirror_close,
.vdev_op_asize = vdev_default_asize,
+ .vdev_op_min_asize = vdev_default_min_asize,
+ .vdev_op_min_alloc = NULL,
.vdev_op_io_start = vdev_mirror_io_start,
.vdev_op_io_done = vdev_mirror_io_done,
.vdev_op_state_change = vdev_mirror_state_change,
- .vdev_op_need_resilver = NULL,
+ .vdev_op_need_resilver = vdev_default_need_resilver,
.vdev_op_hold = NULL,
.vdev_op_rele = NULL,
.vdev_op_remap = NULL,
.vdev_op_xlate = vdev_default_xlate,
+ .vdev_op_rebuild_asize = vdev_mirror_rebuild_asize,
+ .vdev_op_metaslab_init = NULL,
+ .vdev_op_config_generate = NULL,
+ .vdev_op_nparity = NULL,
+ .vdev_op_ndisks = NULL,
.vdev_op_type = VDEV_TYPE_SPARE, /* name of this vdev type */
.vdev_op_leaf = B_FALSE /* not a leaf vdev */
};
-/* BEGIN CSTYLED */
ZFS_MODULE_PARAM(zfs_vdev_mirror, zfs_vdev_mirror_, rotating_inc, INT, ZMOD_RW,
- "Rotating media load increment for non-seeking I/O's");
+ "Rotating media load increment for non-seeking I/Os");
-ZFS_MODULE_PARAM(zfs_vdev_mirror, zfs_vdev_mirror_, rotating_seek_inc, INT, ZMOD_RW,
- "Rotating media load increment for seeking I/O's");
+ZFS_MODULE_PARAM(zfs_vdev_mirror, zfs_vdev_mirror_, rotating_seek_inc, INT,
+ ZMOD_RW, "Rotating media load increment for seeking I/Os");
-ZFS_MODULE_PARAM(zfs_vdev_mirror, zfs_vdev_mirror_, rotating_seek_offset, INT, ZMOD_RW,
+/* BEGIN CSTYLED */
+ZFS_MODULE_PARAM(zfs_vdev_mirror, zfs_vdev_mirror_, rotating_seek_offset, INT,
+ ZMOD_RW,
"Offset in bytes from the last I/O which triggers "
"a reduced rotating media seek increment");
+/* END CSTYLED */
-ZFS_MODULE_PARAM(zfs_vdev_mirror, zfs_vdev_mirror_, non_rotating_inc, INT, ZMOD_RW,
- "Non-rotating media load increment for non-seeking I/O's");
+ZFS_MODULE_PARAM(zfs_vdev_mirror, zfs_vdev_mirror_, non_rotating_inc, INT,
+ ZMOD_RW, "Non-rotating media load increment for non-seeking I/Os");
-ZFS_MODULE_PARAM(zfs_vdev_mirror, zfs_vdev_mirror_, non_rotating_seek_inc, INT, ZMOD_RW,
- "Non-rotating media load increment for seeking I/O's");
-/* END CSTYLED */
+ZFS_MODULE_PARAM(zfs_vdev_mirror, zfs_vdev_mirror_, non_rotating_seek_inc, INT,
+ ZMOD_RW, "Non-rotating media load increment for seeking I/Os");
projects / mirror_zfs.git / blobdiff