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vbdev_lvol: esnap memdomain support

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Return the total number of memory domains supported by the blobstore and
any external snapshot bdev.

Signed-off-by: Mike Gerdts <mgerdts@nvidia.com>
Change-Id: I2f8afba6b31e689b8f942e2cf36906a0a30f38c8
Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/16430
Reviewed-by: Ben Walker <benjamin.walker@intel.com>
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Community-CI: Mellanox Build Bot
Reviewed-by: Jim Harris <james.r.harris@intel.com>
This commit is contained in:
Mike Gerdts 2023-01-13 16:17:04 -06:00 committed by David Ko
parent 35298940a8
commit dcd012e8d0
2 changed files with 66 additions and 3 deletions
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68
module/bdev/lvol/vbdev_lvol.c
View File

@ -954,11 +954,73 @@ static int
vbdev_lvol_get_memory_domains(void *ctx, struct spdk_memory_domain **domains, int array_size)
{
struct spdk_lvol *lvol = ctx;
struct spdk_bdev *base_bdev;
struct spdk_bdev *base_bdev, *esnap_bdev;
struct spdk_bs_dev *bs_dev;
struct spdk_lvol_store *lvs;
int base_cnt, esnap_cnt;
base_bdev = lvol->lvol_store->bs_dev->get_base_bdev(lvol->lvol_store->bs_dev);
lvs = lvol->lvol_store;
base_bdev = lvs->bs_dev->get_base_bdev(lvol->lvol_store->bs_dev);
return spdk_bdev_get_memory_domains(base_bdev, domains, array_size);
base_cnt = spdk_bdev_get_memory_domains(base_bdev, domains, array_size);
if (base_cnt < 0) {
return base_cnt;
}
if (lvol->blob == NULL) {
/*
* This is probably called due to an open happening during blobstore load. Another
* open will follow shortly that has lvol->blob set.
*/
return -EAGAIN;
}
if (!spdk_blob_is_esnap_clone(lvol->blob)) {
return base_cnt;
}
bs_dev = spdk_blob_get_esnap_bs_dev(lvol->blob);
if (bs_dev == NULL) {
assert(false);
SPDK_ERRLOG("lvol %s is an esnap clone but has no esnap device\n", lvol->unique_id);
return base_cnt;
}
if (bs_dev->get_base_bdev == NULL) {
/*
* If this were a blob_bdev, we wouldn't be here. We are probably here because an
* lvol bdev is being registered with spdk_bdev_register() before the external
* snapshot bdev is loaded. Ideally, the load of a missing esnap would trigger an
* event that causes the lvol bdev's memory domain information to be updated.
*/
return base_cnt;
}
esnap_bdev = bs_dev->get_base_bdev(bs_dev);
if (esnap_bdev == NULL) {
/*
* The esnap bdev has not yet been loaded. Anyone that has opened at this point may
* miss out on using memory domains if base_cnt is zero.
*/
SPDK_NOTICELOG("lvol %s reporting %d memory domains, not including missing esnap\n",
lvol->unique_id, base_cnt);
return base_cnt;
}
if (base_cnt < array_size) {
array_size -= base_cnt;
domains += base_cnt;
} else {
array_size = 0;
domains = NULL;
}
esnap_cnt = spdk_bdev_get_memory_domains(esnap_bdev, domains, array_size);
if (esnap_cnt <= 0) {
return base_cnt;
}
return base_cnt + esnap_cnt;
}
static struct spdk_bdev_fn_table vbdev_lvol_fn_table = {

1
test/unit/lib/bdev/vbdev_lvol.c/vbdev_lvol_ut.c
View File

@ -50,6 +50,7 @@ DEFINE_STUB(spdk_lvs_esnap_missing_add, int,
(struct spdk_lvol_store *lvs, struct spdk_lvol *lvol, const void *esnap_id,
uint32_t id_len), -ENOTSUP);
DEFINE_STUB(spdk_blob_is_degraded, bool, (const struct spdk_blob *blob), false);
DEFINE_STUB(spdk_blob_get_esnap_bs_dev, struct spdk_bs_dev *, (const struct spdk_blob *blob), NULL);
struct spdk_blob {
uint64_t id;