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blob: track last md_page index correctly during resize

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During resize, we correctly determine if we have enough
md_pages for new extent pages, before proceeding with
actually allocating clusters and associated extent
pages.

But during actual allocation, we were incrementing
the lfmd output parameter, which was incorrect.
Technically we should increment it any time
bs_allocate_cluster() allocated an md_page.  But
it's also fine to just not increment it at the
call site at all - worst case, we just check that
bit index again which isn't going to cause a
performance problem.

Also add a unit test that demonstrated the original
problem, and works fine with this patch.

Fixes issue #2932.

Signed-off-by: Jim Harris <james.r.harris@intel.com>
Change-Id: Iba177a66e880fb99363944ee44d3d060a44a03a4
Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/17150
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Reviewed-by: Ben Walker <benjamin.walker@intel.com>
Reviewed-by: 阿克曼 <lilei.777@bytedance.com>
Reviewed-by: Konrad Sztyber <konrad.sztyber@intel.com>
Community-CI: Mellanox Build Bot
This commit is contained in:
Jim Harris 2023-03-10 17:31:27 +00:00 committed by Konrad Sztyber
parent 037c8b01a1
commit 7c3c0b6630
2 changed files with 49 additions and 1 deletions
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7
lib/blob/blobstore.c
View File

@ -2132,7 +2132,12 @@ blob_resize(struct spdk_blob *blob, uint64_t sz)
lfmd = 0;
for (i = num_clusters; i < sz; i++) {
bs_allocate_cluster(blob, i, &cluster, &lfmd, true);
lfmd++;
/* Do not increment lfmd here. lfmd will get updated
* to the md_page allocated (if any) when a new extent
* page is needed. Just pass that value again,
* bs_allocate_cluster will just start at that index
* to find the next free md_page when needed.
*/
}
}

43
test/unit/lib/blob/blob.c/blob_ut.c
View File

@ -7615,6 +7615,48 @@ blob_nested_freezes(void)
g_blobid = 0;
}
static void
blob_ext_md_pages(void)
{
struct spdk_blob_store *bs;
struct spdk_bs_dev *dev;
struct spdk_blob *blob;
struct spdk_blob_opts opts;
struct spdk_bs_opts bs_opts;
uint64_t free_clusters;
dev = init_dev();
spdk_bs_opts_init(&bs_opts, sizeof(bs_opts));
snprintf(bs_opts.bstype.bstype, sizeof(bs_opts.bstype.bstype), "TESTTYPE");
/* Issue #2932 was a bug in how we use bs_allocate_cluster() during resize.
* It requires num_md_pages that is much smaller than the number of clusters.
* Make sure we can create a blob that uses all of the free clusters.
*/
bs_opts.cluster_sz = 65536;
bs_opts.num_md_pages = 16;
/* Initialize a new blob store */
spdk_bs_init(dev, &bs_opts, bs_op_with_handle_complete, NULL);
poll_threads();
CU_ASSERT(g_bserrno == 0);
SPDK_CU_ASSERT_FATAL(g_bs != NULL);
bs = g_bs;
free_clusters = spdk_bs_free_cluster_count(bs);
ut_spdk_blob_opts_init(&opts);
opts.num_clusters = free_clusters;
blob = ut_blob_create_and_open(bs, &opts);
spdk_blob_close(blob, blob_op_complete, NULL);
CU_ASSERT(g_bserrno == 0);
spdk_bs_unload(bs, bs_op_complete, NULL);
poll_threads();
CU_ASSERT(g_bserrno == 0);
g_bs = NULL;
}
static void
suite_bs_setup(void)
{
@ -7813,6 +7855,7 @@ main(int argc, char **argv)
CU_ADD_TEST(suite_bs, blob_seek_io_unit);
CU_ADD_TEST(suite_esnap_bs, blob_esnap_create);
CU_ADD_TEST(suite_bs, blob_nested_freezes);
CU_ADD_TEST(suite, blob_ext_md_pages);
allocate_threads(2);
set_thread(0);