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torture: Add test for talloc size accounting in memcache

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BUG: https://bugzilla.samba.org/show_bug.cgi?id=13865

Signed-off-by: Christof Schmitt <cs@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>

Autobuild-User(master): Jeremy Allison <jra@samba.org>
Autobuild-Date(master): Sat Apr  6 06:08:42 UTC 2019 on sn-devel-144
This commit is contained in:
Christof Schmitt 2019-03-28 10:46:43 -07:00 committed by Jeremy Allison
parent 9ff5c0bab7
commit b7028c4246
1 changed files with 69 additions and 1 deletions
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70
source3/torture/torture.c
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@ -11155,13 +11155,14 @@ static bool data_blob_equal(DATA_BLOB a, DATA_BLOB b)
static bool run_local_memcache(int dummy)
{
struct memcache *cache;
DATA_BLOB k1, k2, k3;
DATA_BLOB k1, k2, k3, k4, k5;
DATA_BLOB d1, d3;
DATA_BLOB v1, v3;
TALLOC_CTX *mem_ctx;
char *ptr1 = NULL;
char *ptr2 = NULL;
char *ptr3 = NULL;
char *str1, *str2;
size_t size1, size2;
@ -11187,6 +11188,8 @@ static bool run_local_memcache(int dummy)
k1 = data_blob_const("d1", 2);
k2 = data_blob_const("d2", 2);
k3 = data_blob_const("d3", 2);
k4 = data_blob_const("d4", 2);
k5 = data_blob_const("d5", 2);
memcache_add(cache, STAT_CACHE, k1, d1);
@ -11250,6 +11253,71 @@ static bool run_local_memcache(int dummy)
return false;
}
/*
* Test that talloc size also is accounted in memcache and
* causes purge of other object.
*/
str1 = talloc_zero_size(mem_ctx, 100);
str2 = talloc_zero_size(mem_ctx, 100);
memcache_add_talloc(cache, GETWD_CACHE, k4, &str1);
memcache_add_talloc(cache, GETWD_CACHE, k5, &str1);
ptr3 = memcache_lookup_talloc(cache, GETWD_CACHE, k4);
if (ptr3 != NULL) {
printf("Did find k4, should have been purged\n");
return false;
}
/*
* Test that adding a duplicate non-talloced
* key/value on top of a talloced key/value takes account
* of the talloc_freed value size.
*/
TALLOC_FREE(cache);
TALLOC_FREE(mem_ctx);
mem_ctx = talloc_init("key_replace");
if (mem_ctx == NULL) {
return false;
}
cache = memcache_init(NULL, sizeof(void *) == 8 ? 200 : 100);
if (cache == NULL) {
return false;
}
/*
* Add a 100 byte talloced string. This will
* store a (4 or 8 byte) pointer and record the
* total talloced size.
*/
str1 = talloc_zero_size(mem_ctx, 100);
memcache_add_talloc(cache, GETWD_CACHE, k4, &str1);
/*
* Now overwrite with a small talloced
* value. This should fit in the existing size
* and the total talloced size should be removed
* from the cache size.
*/
str1 = talloc_zero_size(mem_ctx, 2);
memcache_add_talloc(cache, GETWD_CACHE, k4, &str1);
/*
* Now store a 20 byte string. If the
* total talloced size wasn't accounted for
* and removed in the overwrite, then this
* will evict k4.
*/
str2 = talloc_zero_size(mem_ctx, 20);
memcache_add_talloc(cache, GETWD_CACHE, k5, &str2);
ptr3 = memcache_lookup_talloc(cache, GETWD_CACHE, k4);
if (ptr3 == NULL) {
printf("Did not find k4, should not have been purged\n");
return false;
}
TALLOC_FREE(cache);
TALLOC_FREE(mem_ctx);