#include <sys/zfs_context.h>
#include <sys/spa.h>
+#include <sys/spa_impl.h>
+#include <sys/dsl_pool.h>
+#include <sys/dsl_scan.h>
#include <sys/vdev_impl.h>
#include <sys/zio.h>
#include <sys/abd.h>
#include <sys/fs/zfs.h>
+/*
+ * Vdev mirror kstats
+ */
+static kstat_t *mirror_ksp = NULL;
+
+typedef struct mirror_stats {
+ kstat_named_t vdev_mirror_stat_rotating_linear;
+ kstat_named_t vdev_mirror_stat_rotating_offset;
+ kstat_named_t vdev_mirror_stat_rotating_seek;
+ kstat_named_t vdev_mirror_stat_non_rotating_linear;
+ kstat_named_t vdev_mirror_stat_non_rotating_seek;
+
+ kstat_named_t vdev_mirror_stat_preferred_found;
+ kstat_named_t vdev_mirror_stat_preferred_not_found;
+} mirror_stats_t;
+
+static mirror_stats_t mirror_stats = {
+ /* New I/O follows directly the last I/O */
+ { "rotating_linear", KSTAT_DATA_UINT64 },
+ /* New I/O is within zfs_vdev_mirror_rotating_seek_offset of the last */
+ { "rotating_offset", KSTAT_DATA_UINT64 },
+ /* New I/O requires random seek */
+ { "rotating_seek", KSTAT_DATA_UINT64 },
+ /* New I/O follows directly the last I/O (nonrot) */
+ { "non_rotating_linear", KSTAT_DATA_UINT64 },
+ /* New I/O requires random seek (nonrot) */
+ { "non_rotating_seek", KSTAT_DATA_UINT64 },
+ /* Preferred child vdev found */
+ { "preferred_found", KSTAT_DATA_UINT64 },
+ /* Preferred child vdev not found or equal load */
+ { "preferred_not_found", KSTAT_DATA_UINT64 },
+
+};
+
+#define MIRROR_STAT(stat) (mirror_stats.stat.value.ui64)
+#define MIRROR_INCR(stat, val) atomic_add_64(&MIRROR_STAT(stat), val)
+#define MIRROR_BUMP(stat) MIRROR_INCR(stat, 1)
+
+void
+vdev_mirror_stat_init(void)
+{
+ mirror_ksp = kstat_create("zfs", 0, "vdev_mirror_stats",
+ "misc", KSTAT_TYPE_NAMED,
+ sizeof (mirror_stats) / sizeof (kstat_named_t), KSTAT_FLAG_VIRTUAL);
+ if (mirror_ksp != NULL) {
+ mirror_ksp->ks_data = &mirror_stats;
+ kstat_install(mirror_ksp);
+ }
+}
+
+void
+vdev_mirror_stat_fini(void)
+{
+ if (mirror_ksp != NULL) {
+ kstat_delete(mirror_ksp);
+ mirror_ksp = NULL;
+ }
+}
+
/*
* Virtual device vector for mirroring.
*/
int *mm_preferred;
int mm_preferred_cnt;
int mm_children;
- boolean_t mm_replacing;
+ boolean_t mm_resilvering;
boolean_t mm_root;
mirror_child_t mm_child[];
} mirror_map_t;
}
static inline mirror_map_t *
-vdev_mirror_map_alloc(int children, boolean_t replacing, boolean_t root)
+vdev_mirror_map_alloc(int children, boolean_t resilvering, boolean_t root)
{
mirror_map_t *mm;
mm = kmem_zalloc(vdev_mirror_map_size(children), KM_SLEEP);
mm->mm_children = children;
- mm->mm_replacing = replacing;
+ mm->mm_resilvering = resilvering;
mm->mm_root = root;
mm->mm_preferred = (int *)((uintptr_t)mm +
offsetof(mirror_map_t, mm_child[children]));
}
static const zio_vsd_ops_t vdev_mirror_vsd_ops = {
- vdev_mirror_map_free,
- zio_vsd_default_cksum_report
+ .vsd_free = vdev_mirror_map_free,
+ .vsd_cksum_report = zio_vsd_default_cksum_report
};
static int
vdev_mirror_load(mirror_map_t *mm, vdev_t *vd, uint64_t zio_offset)
{
- uint64_t lastoffset;
+ uint64_t last_offset;
+ int64_t offset_diff;
int load;
/* All DVAs have equal weight at the root. */
* worse overall when resilvering with compared to without.
*/
+ /* Fix zio_offset for leaf vdevs */
+ if (vd->vdev_ops->vdev_op_leaf)
+ zio_offset += VDEV_LABEL_START_SIZE;
+
/* Standard load based on pending queue length. */
load = vdev_queue_length(vd);
- lastoffset = vdev_queue_lastoffset(vd);
+ last_offset = vdev_queue_last_offset(vd);
if (vd->vdev_nonrot) {
/* Non-rotating media. */
- if (lastoffset == zio_offset)
+ if (last_offset == zio_offset) {
+ MIRROR_BUMP(vdev_mirror_stat_non_rotating_linear);
return (load + zfs_vdev_mirror_non_rotating_inc);
+ }
/*
* Apply a seek penalty even for non-rotating devices as
* the device, thus avoiding unnecessary per-command overhead
* and boosting performance.
*/
+ MIRROR_BUMP(vdev_mirror_stat_non_rotating_seek);
return (load + zfs_vdev_mirror_non_rotating_seek_inc);
}
/* Rotating media I/O's which directly follow the last I/O. */
- if (lastoffset == zio_offset)
+ if (last_offset == zio_offset) {
+ MIRROR_BUMP(vdev_mirror_stat_rotating_linear);
return (load + zfs_vdev_mirror_rotating_inc);
+ }
/*
* Apply half the seek increment to I/O's within seek offset
- * of the last I/O queued to this vdev as they should incur less
+ * of the last I/O issued to this vdev as they should incur less
* of a seek increment.
*/
- if (ABS(lastoffset - zio_offset) <
- zfs_vdev_mirror_rotating_seek_offset)
+ offset_diff = (int64_t)(last_offset - zio_offset);
+ if (ABS(offset_diff) < zfs_vdev_mirror_rotating_seek_offset) {
+ MIRROR_BUMP(vdev_mirror_stat_rotating_offset);
return (load + (zfs_vdev_mirror_rotating_seek_inc / 2));
+ }
/* Apply the full seek increment to all other I/O's. */
+ MIRROR_BUMP(vdev_mirror_stat_rotating_seek);
return (load + zfs_vdev_mirror_rotating_seek_inc);
}
if (vd == NULL) {
dva_t *dva = zio->io_bp->blk_dva;
spa_t *spa = zio->io_spa;
+ dva_t dva_copy[SPA_DVAS_PER_BP];
- mm = vdev_mirror_map_alloc(BP_GET_NDVAS(zio->io_bp), B_FALSE,
- B_TRUE);
+ c = BP_GET_NDVAS(zio->io_bp);
+
+ /*
+ * If we do not trust the pool config, some DVAs might be
+ * invalid or point to vdevs that do not exist. We skip them.
+ */
+ if (!spa_trust_config(spa)) {
+ ASSERT3U(zio->io_type, ==, ZIO_TYPE_READ);
+ int j = 0;
+ for (int i = 0; i < c; i++) {
+ if (zfs_dva_valid(spa, &dva[i], zio->io_bp))
+ dva_copy[j++] = dva[i];
+ }
+ if (j == 0) {
+ zio->io_vsd = NULL;
+ zio->io_error = ENXIO;
+ return (NULL);
+ }
+ if (j < c) {
+ dva = dva_copy;
+ c = j;
+ }
+ }
+
+ mm = vdev_mirror_map_alloc(c, B_FALSE, B_TRUE);
for (c = 0; c < mm->mm_children; c++) {
mc = &mm->mm_child[c];
mc->mc_offset = DVA_GET_OFFSET(&dva[c]);
}
} else {
- mm = vdev_mirror_map_alloc(vd->vdev_children,
- (vd->vdev_ops == &vdev_replacing_ops ||
- vd->vdev_ops == &vdev_spare_ops), B_FALSE);
+ /*
+ * If we are resilvering, then we should handle scrub reads
+ * differently; we shouldn't issue them to the resilvering
+ * device because it might not have those blocks.
+ *
+ * We are resilvering iff:
+ * 1) We are a replacing vdev (ie our name is "replacing-1" or
+ * "spare-1" or something like that), and
+ * 2) The pool is currently being resilvered.
+ *
+ * We cannot simply check vd->vdev_resilver_txg, because it's
+ * not set in this path.
+ *
+ * Nor can we just check our vdev_ops; there are cases (such as
+ * when a user types "zpool replace pool odev spare_dev" and
+ * spare_dev is in the spare list, or when a spare device is
+ * automatically used to replace a DEGRADED device) when
+ * resilvering is complete but both the original vdev and the
+ * spare vdev remain in the pool. That behavior is intentional.
+ * It helps implement the policy that a spare should be
+ * automatically removed from the pool after the user replaces
+ * the device that originally failed.
+ *
+ * If a spa load is in progress, then spa_dsl_pool may be
+ * uninitialized. But we shouldn't be resilvering during a spa
+ * load anyway.
+ */
+ boolean_t replacing = (vd->vdev_ops == &vdev_replacing_ops ||
+ vd->vdev_ops == &vdev_spare_ops) &&
+ spa_load_state(vd->vdev_spa) == SPA_LOAD_NONE &&
+ dsl_scan_resilvering(vd->vdev_spa->spa_dsl_pool);
+ mm = vdev_mirror_map_alloc(vd->vdev_children, replacing,
+ B_FALSE);
for (c = 0; c < mm->mm_children; c++) {
mc = &mm->mm_child[c];
mc->mc_vd = vd->vdev_child[c];
{
int numerrors = 0;
int lasterror = 0;
- int c;
if (vd->vdev_children == 0) {
vd->vdev_stat.vs_aux = VDEV_AUX_BAD_LABEL;
vdev_open_children(vd);
- for (c = 0; c < vd->vdev_children; c++) {
+ for (int c = 0; c < vd->vdev_children; c++) {
vdev_t *cvd = vd->vdev_child[c];
if (cvd->vdev_open_error) {
}
if (numerrors == vd->vdev_children) {
- vd->vdev_stat.vs_aux = VDEV_AUX_NO_REPLICAS;
+ if (vdev_children_are_offline(vd))
+ vd->vdev_stat.vs_aux = VDEV_AUX_CHILDREN_OFFLINE;
+ else
+ vd->vdev_stat.vs_aux = VDEV_AUX_NO_REPLICAS;
return (lasterror);
}
static void
vdev_mirror_close(vdev_t *vd)
{
- int c;
-
- for (c = 0; c < vd->vdev_children; c++)
+ for (int c = 0; c < vd->vdev_children; c++)
vdev_close(vd->vdev_child[c]);
}
}
if (mm->mm_preferred_cnt == 1) {
- vdev_queue_register_lastoffset(
- mm->mm_child[mm->mm_preferred[0]].mc_vd, zio);
+ MIRROR_BUMP(vdev_mirror_stat_preferred_found);
return (mm->mm_preferred[0]);
}
if (mm->mm_preferred_cnt > 1) {
- int c = vdev_mirror_preferred_child_randomize(zio);
-
- vdev_queue_register_lastoffset(mm->mm_child[c].mc_vd, zio);
- return (c);
+ MIRROR_BUMP(vdev_mirror_stat_preferred_not_found);
+ return (vdev_mirror_preferred_child_randomize(zio));
}
/*
* Look for any child we haven't already tried before giving up.
*/
for (c = 0; c < mm->mm_children; c++) {
- if (!mm->mm_child[c].mc_tried) {
- vdev_queue_register_lastoffset(mm->mm_child[c].mc_vd,
- zio);
+ if (!mm->mm_child[c].mc_tried)
return (c);
- }
}
/*
mm = vdev_mirror_map_init(zio);
+ if (mm == NULL) {
+ ASSERT(!spa_trust_config(zio->io_spa));
+ ASSERT(zio->io_type == ZIO_TYPE_READ);
+ zio_execute(zio);
+ return;
+ }
+
if (zio->io_type == ZIO_TYPE_READ) {
- if ((zio->io_flags & ZIO_FLAG_SCRUB) && !mm->mm_replacing) {
+ if (zio->io_bp != NULL &&
+ (zio->io_flags & ZIO_FLAG_SCRUB) && !mm->mm_resilvering) {
/*
- * For scrubbing reads 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 (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 (c = 0; c < mm->mm_children; c++) {
mc = &mm->mm_child[c];
static int
vdev_mirror_worst_error(mirror_map_t *mm)
{
- int c, error[2] = { 0, 0 };
+ int error[2] = { 0, 0 };
- for (c = 0; c < mm->mm_children; c++) {
+ for (int c = 0; c < mm->mm_children; c++) {
mirror_child_t *mc = &mm->mm_child[c];
int s = mc->mc_speculative;
error[s] = zio_worst_error(error[s], mc->mc_error);
int good_copies = 0;
int unexpected_errors = 0;
+ if (mm == NULL)
+ return;
+
for (c = 0; c < mm->mm_children; c++) {
mc = &mm->mm_child[c];
if (good_copies && spa_writeable(zio->io_spa) &&
(unexpected_errors ||
(zio->io_flags & ZIO_FLAG_RESILVER) ||
- ((zio->io_flags & ZIO_FLAG_SCRUB) && mm->mm_replacing))) {
+ ((zio->io_flags & ZIO_FLAG_SCRUB) && mm->mm_resilvering))) {
/*
* Use the good data we have in hand to repair damaged children.
*/
if (mc->mc_error == 0) {
if (mc->mc_tried)
continue;
+ /*
+ * We didn't try this child. We need to
+ * repair it if:
+ * 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)
+ * - 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 &&
!vdev_dtl_contains(mc->mc_vd, DTL_PARTIAL,
zio->io_txg, 1))
continue;
static void
vdev_mirror_state_change(vdev_t *vd, int faulted, int degraded)
{
- if (faulted == vd->vdev_children)
- vdev_set_state(vd, B_FALSE, VDEV_STATE_CANT_OPEN,
- VDEV_AUX_NO_REPLICAS);
- else if (degraded + faulted != 0)
+ if (faulted == vd->vdev_children) {
+ if (vdev_children_are_offline(vd)) {
+ vdev_set_state(vd, B_FALSE, VDEV_STATE_OFFLINE,
+ VDEV_AUX_CHILDREN_OFFLINE);
+ } else {
+ vdev_set_state(vd, B_FALSE, VDEV_STATE_CANT_OPEN,
+ VDEV_AUX_NO_REPLICAS);
+ }
+ } else if (degraded + faulted != 0) {
vdev_set_state(vd, B_FALSE, VDEV_STATE_DEGRADED, VDEV_AUX_NONE);
- else
+ } else {
vdev_set_state(vd, B_FALSE, VDEV_STATE_HEALTHY, VDEV_AUX_NONE);
+ }
}
vdev_ops_t vdev_mirror_ops = {
vdev_mirror_state_change,
NULL,
NULL,
+ NULL,
+ NULL,
+ vdev_default_xlate,
VDEV_TYPE_MIRROR, /* name of this vdev type */
B_FALSE /* not a leaf vdev */
};
vdev_mirror_state_change,
NULL,
NULL,
+ NULL,
+ NULL,
+ vdev_default_xlate,
VDEV_TYPE_REPLACING, /* name of this vdev type */
B_FALSE /* not a leaf vdev */
};
vdev_mirror_state_change,
NULL,
NULL,
+ NULL,
+ NULL,
+ vdev_default_xlate,
VDEV_TYPE_SPARE, /* name of this vdev type */
B_FALSE /* not a leaf vdev */
};
-#if defined(_KERNEL) && defined(HAVE_SPL)
+#if defined(_KERNEL)
+/* BEGIN CSTYLED */
module_param(zfs_vdev_mirror_rotating_inc, int, 0644);
MODULE_PARM_DESC(zfs_vdev_mirror_rotating_inc,
"Rotating media load increment for non-seeking I/O's");
"Rotating media load increment for seeking I/O's");
module_param(zfs_vdev_mirror_rotating_seek_offset, int, 0644);
+
MODULE_PARM_DESC(zfs_vdev_mirror_rotating_seek_offset,
"Offset in bytes from the last I/O which "
"triggers a reduced rotating media seek increment");
module_param(zfs_vdev_mirror_non_rotating_seek_inc, int, 0644);
MODULE_PARM_DESC(zfs_vdev_mirror_non_rotating_seek_inc,
"Non-rotating media load increment for seeking I/O's");
-
+/* END CSTYLED */
#endif
projects / mirror_zfs.git / blobdiff