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btrfs: tests: add a test for btrfs_add_extent_mapping

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This helper is different from the normal add_extent_mapping in that it
will stuff an em into a gap that exists between overlapping em's in the
tree.  It appeared there was a bug so I wrote a self test to validate it
did the correct thing when it worked with two side by side ems.
Thankfully it is correct, but more testing is better.

Reviewed-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Josef Bacik 2023-08-17 16:57:32 -04:00 committed by David Sterba
parent 89c3760428
commit f345dbdf2c
1 changed files with 56 additions and 0 deletions
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56
fs/btrfs/tests/extent-map-tests.c
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@ -655,6 +655,59 @@ out:
return ret;
}
/*
* Test the btrfs_add_extent_mapping helper which will attempt to create an em
* for areas between two existing ems. Validate it doesn't do this when there
* are two unmerged em's side by side.
*/
static int test_case_6(struct btrfs_fs_info *fs_info, struct extent_map_tree *em_tree)
{
struct extent_map *em = NULL;
int ret;
ret = add_compressed_extent(em_tree, 0, SZ_4K, 0);
if (ret)
goto out;
ret = add_compressed_extent(em_tree, SZ_4K, SZ_4K, 0);
if (ret)
goto out;
em = alloc_extent_map();
if (!em) {
test_std_err(TEST_ALLOC_EXTENT_MAP);
return -ENOMEM;
}
em->start = SZ_4K;
em->len = SZ_4K;
em->block_start = SZ_16K;
em->block_len = SZ_16K;
write_lock(&em_tree->lock);
ret = btrfs_add_extent_mapping(fs_info, em_tree, &em, 0, SZ_8K);
write_unlock(&em_tree->lock);
if (ret != 0) {
test_err("got an error when adding our em: %d", ret);
goto out;
}
ret = -EINVAL;
if (em->start != 0) {
test_err("unexpected em->start at %llu, wanted 0", em->start);
goto out;
}
if (em->len != SZ_4K) {
test_err("unexpected em->len %llu, expected 4K", em->len);
goto out;
}
ret = 0;
out:
free_extent_map(em);
free_extent_map_tree(em_tree);
return ret;
}
struct rmap_test_vector {
u64 raid_type;
u64 physical_start;
@ -835,6 +888,9 @@ int btrfs_test_extent_map(void)
if (ret)
goto out;
ret = test_case_5();
if (ret)
goto out;
ret = test_case_6(fs_info, em_tree);
if (ret)
goto out;