btrfs: selftests: add test for punching a hole into 3 RAID stripe-extents

Test creating a range of three RAID stripe-extents and then punch a hole
in the middle, deleting all of the middle extents and partially deleting
the "book ends".

Reviewed-by: Filipe Manana <[email protected]>
Signed-off-by: Johannes Thumshirn <[email protected]>
Signed-off-by: David Sterba <[email protected]>

Author: morbidrsa

fs/btrfs/tests/raid-stripe-tree-tests.c

@@ -31,6 +31,188 @@ static struct btrfs_device *btrfs_device_by_devid(struct btrfs_fs_devices *fs_de
 	return NULL;
 }
 
+/*
+ * Test creating a range of three extents and then punch a hole in the middle,
+ * deleting all of the middle extents and partially deleting the "book ends".
+ */
+static int test_punch_hole_3extents(struct btrfs_trans_handle *trans)
+{
+	struct btrfs_fs_info *fs_info = trans->fs_info;
+	struct btrfs_io_context *bioc;
+	struct btrfs_io_stripe io_stripe = { 0 };
+	u64 map_type = RST_TEST_RAID1_TYPE;
+	u64 logical1 = SZ_1M;
+	u64 len1 = SZ_1M;
+	u64 logical2 = logical1 + len1;
+	u64 len2 = SZ_1M;
+	u64 logical3 = logical2 + len2;
+	u64 len3 = SZ_1M;
+	u64 hole_start = logical1 + SZ_256K;
+	u64 hole_len = SZ_2M;
+	int ret;
+
+	bioc = alloc_btrfs_io_context(fs_info, logical1, RST_TEST_NUM_DEVICES);
+	if (!bioc) {
+		test_std_err(TEST_ALLOC_IO_CONTEXT);
+		ret = -ENOMEM;
+		goto out;
+	}
+
+	io_stripe.dev = btrfs_device_by_devid(fs_info->fs_devices, 0);
+
+	/* Prepare for the test, 1st create 3 x 1M extents. */
+	bioc->map_type = map_type;
+	bioc->size = len1;
+
+	for (int i = 0; i < RST_TEST_NUM_DEVICES; i++) {
+		struct btrfs_io_stripe *stripe = &bioc->stripes[i];
+
+		stripe->dev = btrfs_device_by_devid(fs_info->fs_devices, i);
+		if (!stripe->dev) {
+			test_err("cannot find device with devid %d", i);
+			ret = -EINVAL;
+			goto out;
+		}
+
+		stripe->physical = logical1 + i * SZ_1G;
+	}
+
+	ret = btrfs_insert_one_raid_extent(trans, bioc);
+	if (ret) {
+		test_err("inserting RAID extent failed: %d", ret);
+		goto out;
+	}
+
+	bioc->logical = logical2;
+	bioc->size = len2;
+	for (int i = 0; i < RST_TEST_NUM_DEVICES; i++) {
+		struct btrfs_io_stripe *stripe = &bioc->stripes[i];
+
+		stripe->dev = btrfs_device_by_devid(fs_info->fs_devices, i);
+		if (!stripe->dev) {
+			test_err("cannot find device with devid %d", i);
+			ret = -EINVAL;
+			goto out;
+		}
+
+		stripe->physical = logical2 + i * SZ_1G;
+	}
+
+	ret = btrfs_insert_one_raid_extent(trans, bioc);
+	if (ret) {
+		test_err("inserting RAID extent failed: %d", ret);
+		goto out;
+	}
+
+	bioc->logical = logical3;
+	bioc->size = len3;
+	for (int i = 0; i < RST_TEST_NUM_DEVICES; i++) {
+		struct btrfs_io_stripe *stripe = &bioc->stripes[i];
+
+		stripe->dev = btrfs_device_by_devid(fs_info->fs_devices, i);
+		if (!stripe->dev) {
+			test_err("cannot find device with devid %d", i);
+			ret = -EINVAL;
+			goto out;
+		}
+
+		stripe->physical = logical3 + i * SZ_1G;
+	}
+
+	ret = btrfs_insert_one_raid_extent(trans, bioc);
+	if (ret) {
+		test_err("inserting RAID extent failed: %d", ret);
+		goto out;
+	}
+
+	/*
+	 * Delete a range starting at logical1 + 256K and 2M in length. Extent
+	 * 1 is truncated to 256k length, extent 2 is completely dropped and
+	 * extent 3 is moved 256K to the right.
+	 */
+	ret = btrfs_delete_raid_extent(trans, hole_start, hole_len);
+	if (ret) {
+		test_err("deleting RAID extent [%llu, %llu] failed",
+			 hole_start, hole_start + hole_len);
+		goto out;
+	}
+
+	/* Get the first extent and check its size. */
+	ret = btrfs_get_raid_extent_offset(fs_info, logical1, &len1, map_type,
+					   0, &io_stripe);
+	if (ret) {
+		test_err("lookup of RAID extent [%llu, %llu] failed",
+			 logical1, logical1 + len1);
+		goto out;
+	}
+
+	if (io_stripe.physical != logical1) {
+		test_err("invalid physical address, expected %llu, got %llu",
+			 logical1, io_stripe.physical);
+		ret = -EINVAL;
+		goto out;
+	}
+
+	if (len1 != SZ_256K) {
+		test_err("invalid stripe length, expected %llu, got %llu",
+			 (u64)SZ_256K, len1);
+		ret = -EINVAL;
+		goto out;
+	}
+
+	/* Get the second extent and check it's absent. */
+	ret = btrfs_get_raid_extent_offset(fs_info, logical2, &len2, map_type,
+					   0, &io_stripe);
+	if (ret != -ENODATA) {
+		test_err("lookup of RAID extent [%llu, %llu] succeeded should fail",
+			 logical2, logical2 + len2);
+		ret = -EINVAL;
+		goto out;
+	}
+
+	/* Get the third extent and check its size. */
+	logical3 += SZ_256K;
+	ret = btrfs_get_raid_extent_offset(fs_info, logical3, &len3, map_type,
+					   0, &io_stripe);
+	if (ret) {
+		test_err("lookup of RAID extent [%llu, %llu] failed",
+			 logical3, logical3 + len3);
+		goto out;
+	}
+
+	if (io_stripe.physical != logical3) {
+		test_err("invalid physical address, expected %llu, got %llu",
+			 logical3 + SZ_256K, io_stripe.physical);
+		ret = -EINVAL;
+		goto out;
+	}
+
+	if (len3 != SZ_1M - SZ_256K) {
+		test_err("invalid stripe length, expected %llu, got %llu",
+			 (u64)SZ_1M - SZ_256K, len3);
+		ret = -EINVAL;
+		goto out;
+	}
+
+	ret = btrfs_delete_raid_extent(trans, logical1, len1);
+	if (ret) {
+		test_err("deleting RAID extent [%llu, %llu] failed",
+			 logical1, logical1 + len1);
+		goto out;
+	}
+
+	ret = btrfs_delete_raid_extent(trans, logical3, len3);
+	if (ret) {
+		test_err("deleting RAID extent [%llu, %llu] failed",
+			 logical1, logical1 + len1);
+		goto out;
+	}
+
+out:
+	btrfs_put_bioc(bioc);
+	return ret;
+}
+
 /* Test punching a hole into a single RAID stripe-extent. */
 static int test_punch_hole(struct btrfs_trans_handle *trans)
 {
@@ -752,6 +934,7 @@ static const test_func_t tests[] = {
 	test_front_delete,
 	test_front_delete_prev_item,
 	test_punch_hole,
+	test_punch_hole_3extents,
 };
 
 static int run_test(test_func_t test, u32 sectorsize, u32 nodesize)