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authorJosef Bacik <josef@toxicpanda.com>2023-08-17 23:57:33 +0300
committerDavid Sterba <dsterba@suse.com>2023-08-21 15:54:49 +0300
commit92e1229b204d66525ee95054188938142420324d (patch)
treed776c977f166f744beb0b7381769f6d2f3026706 /fs/btrfs
parentf345dbdf2c9c4733d52b9389da6c02672f3b8672 (diff)
downloadlinux-92e1229b204d66525ee95054188938142420324d.tar.xz
btrfs: tests: test invalid splitting when skipping pinned drop extent_map
This reproduces the bug fixed by "btrfs: fix incorrect splitting in btrfs_drop_extent_map_range", we were improperly calculating the range for the split extent. Add a test that exercises this scenario and validates that we get the correct resulting extent_maps in our tree. Reviewed-by: Filipe Manana <fdmanana@suse.com> Signed-off-by: Josef Bacik <josef@toxicpanda.com> Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'fs/btrfs')
-rw-r--r--fs/btrfs/tests/extent-map-tests.c138
1 files changed, 138 insertions, 0 deletions
diff --git a/fs/btrfs/tests/extent-map-tests.c b/fs/btrfs/tests/extent-map-tests.c
index 31de4cd0666f..29bdd08b241f 100644
--- a/fs/btrfs/tests/extent-map-tests.c
+++ b/fs/btrfs/tests/extent-map-tests.c
@@ -708,6 +708,141 @@ out:
return ret;
}
+/*
+ * Regression test for btrfs_drop_extent_map_range. Calling with skip_pinned ==
+ * true would mess up the start/end calculations and subsequent splits would be
+ * incorrect.
+ */
+static int test_case_7(void)
+{
+ struct extent_map_tree *em_tree;
+ struct extent_map *em;
+ struct inode *inode;
+ int ret;
+
+ test_msg("Running btrfs_drop_extent_cache with pinned");
+
+ inode = btrfs_new_test_inode();
+ if (!inode) {
+ test_std_err(TEST_ALLOC_INODE);
+ return -ENOMEM;
+ }
+
+ em_tree = &BTRFS_I(inode)->extent_tree;
+
+ em = alloc_extent_map();
+ if (!em) {
+ test_std_err(TEST_ALLOC_EXTENT_MAP);
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ /* [0, 16K), pinned */
+ em->start = 0;
+ em->len = SZ_16K;
+ em->block_start = 0;
+ em->block_len = SZ_4K;
+ set_bit(EXTENT_FLAG_PINNED, &em->flags);
+ write_lock(&em_tree->lock);
+ ret = add_extent_mapping(em_tree, em, 0);
+ write_unlock(&em_tree->lock);
+ if (ret < 0) {
+ test_err("couldn't add extent map");
+ goto out;
+ }
+ free_extent_map(em);
+
+ em = alloc_extent_map();
+ if (!em) {
+ test_std_err(TEST_ALLOC_EXTENT_MAP);
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ /* [32K, 48K), not pinned */
+ em->start = SZ_32K;
+ em->len = SZ_16K;
+ em->block_start = SZ_32K;
+ em->block_len = SZ_16K;
+ write_lock(&em_tree->lock);
+ ret = add_extent_mapping(em_tree, em, 0);
+ write_unlock(&em_tree->lock);
+ if (ret < 0) {
+ test_err("couldn't add extent map");
+ goto out;
+ }
+ free_extent_map(em);
+
+ /*
+ * Drop [0, 36K) This should skip the [0, 4K) extent and then split the
+ * [32K, 48K) extent.
+ */
+ btrfs_drop_extent_map_range(BTRFS_I(inode), 0, (36 * SZ_1K) - 1, true);
+
+ /* Make sure our extent maps look sane. */
+ ret = -EINVAL;
+
+ em = lookup_extent_mapping(em_tree, 0, SZ_16K);
+ if (!em) {
+ test_err("didn't find an em at 0 as expected");
+ goto out;
+ }
+
+ if (em->start != 0) {
+ test_err("em->start is %llu, expected 0", em->start);
+ goto out;
+ }
+
+ if (em->len != SZ_16K) {
+ test_err("em->len is %llu, expected 16K", em->len);
+ goto out;
+ }
+
+ free_extent_map(em);
+
+ read_lock(&em_tree->lock);
+ em = lookup_extent_mapping(em_tree, SZ_16K, SZ_16K);
+ read_unlock(&em_tree->lock);
+ if (em) {
+ test_err("found an em when we weren't expecting one");
+ goto out;
+ }
+
+ read_lock(&em_tree->lock);
+ em = lookup_extent_mapping(em_tree, SZ_32K, SZ_16K);
+ read_unlock(&em_tree->lock);
+ if (!em) {
+ test_err("didn't find an em at 32K as expected");
+ goto out;
+ }
+
+ if (em->start != (36 * SZ_1K)) {
+ test_err("em->start is %llu, expected 36K", em->start);
+ goto out;
+ }
+
+ if (em->len != (12 * SZ_1K)) {
+ test_err("em->len is %llu, expected 12K", em->len);
+ goto out;
+ }
+
+ free_extent_map(em);
+
+ read_lock(&em_tree->lock);
+ em = lookup_extent_mapping(em_tree, 48 * SZ_1K, (u64)-1);
+ read_unlock(&em_tree->lock);
+ if (em) {
+ test_err("found an unexpected em above 48K");
+ goto out;
+ }
+
+ ret = 0;
+out:
+ free_extent_map(em);
+ iput(inode);
+ return ret;
+}
+
struct rmap_test_vector {
u64 raid_type;
u64 physical_start;
@@ -893,6 +1028,9 @@ int btrfs_test_extent_map(void)
ret = test_case_6(fs_info, em_tree);
if (ret)
goto out;
+ ret = test_case_7();
+ if (ret)
+ goto out;
test_msg("running rmap tests");
for (i = 0; i < ARRAY_SIZE(rmap_tests); i++) {