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-rw-r--r--fs/btrfs/tests/extent-map-tests.c636
1 files changed, 636 insertions, 0 deletions
diff --git a/fs/btrfs/tests/extent-map-tests.c b/fs/btrfs/tests/extent-map-tests.c
new file mode 100644
index 000000000..c5b3a631b
--- /dev/null
+++ b/fs/btrfs/tests/extent-map-tests.c
@@ -0,0 +1,636 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2017 Oracle. All rights reserved.
+ */
+
+#include <linux/types.h>
+#include "btrfs-tests.h"
+#include "../ctree.h"
+#include "../volumes.h"
+#include "../disk-io.h"
+#include "../block-group.h"
+
+static void free_extent_map_tree(struct extent_map_tree *em_tree)
+{
+ struct extent_map *em;
+ struct rb_node *node;
+
+ write_lock(&em_tree->lock);
+ while (!RB_EMPTY_ROOT(&em_tree->map.rb_root)) {
+ node = rb_first_cached(&em_tree->map);
+ em = rb_entry(node, struct extent_map, rb_node);
+ remove_extent_mapping(em_tree, em);
+
+#ifdef CONFIG_BTRFS_DEBUG
+ if (refcount_read(&em->refs) != 1) {
+ test_err(
+"em leak: em (start 0x%llx len 0x%llx block_start 0x%llx block_len 0x%llx) refs %d",
+ em->start, em->len, em->block_start,
+ em->block_len, refcount_read(&em->refs));
+
+ refcount_set(&em->refs, 1);
+ }
+#endif
+ free_extent_map(em);
+ }
+ write_unlock(&em_tree->lock);
+}
+
+/*
+ * Test scenario:
+ *
+ * Suppose that no extent map has been loaded into memory yet, there is a file
+ * extent [0, 16K), followed by another file extent [16K, 20K), two dio reads
+ * are entering btrfs_get_extent() concurrently, t1 is reading [8K, 16K), t2 is
+ * reading [0, 8K)
+ *
+ * t1 t2
+ * btrfs_get_extent() btrfs_get_extent()
+ * -> lookup_extent_mapping() ->lookup_extent_mapping()
+ * -> add_extent_mapping(0, 16K)
+ * -> return em
+ * ->add_extent_mapping(0, 16K)
+ * -> #handle -EEXIST
+ */
+static int test_case_1(struct btrfs_fs_info *fs_info,
+ struct extent_map_tree *em_tree)
+{
+ struct extent_map *em;
+ u64 start = 0;
+ u64 len = SZ_8K;
+ int ret;
+
+ em = alloc_extent_map();
+ if (!em) {
+ test_std_err(TEST_ALLOC_EXTENT_MAP);
+ return -ENOMEM;
+ }
+
+ /* Add [0, 16K) */
+ em->start = 0;
+ em->len = SZ_16K;
+ em->block_start = 0;
+ 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("cannot add extent range [0, 16K)");
+ goto out;
+ }
+ free_extent_map(em);
+
+ /* Add [16K, 20K) following [0, 16K) */
+ em = alloc_extent_map();
+ if (!em) {
+ test_std_err(TEST_ALLOC_EXTENT_MAP);
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ em->start = SZ_16K;
+ em->len = SZ_4K;
+ em->block_start = SZ_32K; /* avoid merging */
+ em->block_len = SZ_4K;
+ write_lock(&em_tree->lock);
+ ret = add_extent_mapping(em_tree, em, 0);
+ write_unlock(&em_tree->lock);
+ if (ret < 0) {
+ test_err("cannot add extent range [16K, 20K)");
+ goto out;
+ }
+ free_extent_map(em);
+
+ em = alloc_extent_map();
+ if (!em) {
+ test_std_err(TEST_ALLOC_EXTENT_MAP);
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ /* Add [0, 8K), should return [0, 16K) instead. */
+ em->start = start;
+ em->len = len;
+ em->block_start = start;
+ em->block_len = len;
+ write_lock(&em_tree->lock);
+ ret = btrfs_add_extent_mapping(fs_info, em_tree, &em, em->start, em->len);
+ write_unlock(&em_tree->lock);
+ if (ret) {
+ test_err("case1 [%llu %llu]: ret %d", start, start + len, ret);
+ goto out;
+ }
+ if (em &&
+ (em->start != 0 || extent_map_end(em) != SZ_16K ||
+ em->block_start != 0 || em->block_len != SZ_16K)) {
+ test_err(
+"case1 [%llu %llu]: ret %d return a wrong em (start %llu len %llu block_start %llu block_len %llu",
+ start, start + len, ret, em->start, em->len,
+ em->block_start, em->block_len);
+ ret = -EINVAL;
+ }
+ free_extent_map(em);
+out:
+ free_extent_map_tree(em_tree);
+
+ return ret;
+}
+
+/*
+ * Test scenario:
+ *
+ * Reading the inline ending up with EEXIST, ie. read an inline
+ * extent and discard page cache and read it again.
+ */
+static int test_case_2(struct btrfs_fs_info *fs_info,
+ struct extent_map_tree *em_tree)
+{
+ struct extent_map *em;
+ int ret;
+
+ em = alloc_extent_map();
+ if (!em) {
+ test_std_err(TEST_ALLOC_EXTENT_MAP);
+ return -ENOMEM;
+ }
+
+ /* Add [0, 1K) */
+ em->start = 0;
+ em->len = SZ_1K;
+ em->block_start = EXTENT_MAP_INLINE;
+ em->block_len = (u64)-1;
+ write_lock(&em_tree->lock);
+ ret = add_extent_mapping(em_tree, em, 0);
+ write_unlock(&em_tree->lock);
+ if (ret < 0) {
+ test_err("cannot add extent range [0, 1K)");
+ goto out;
+ }
+ free_extent_map(em);
+
+ /* Add [4K, 8K) following [0, 1K) */
+ em = alloc_extent_map();
+ if (!em) {
+ test_std_err(TEST_ALLOC_EXTENT_MAP);
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ em->start = SZ_4K;
+ em->len = SZ_4K;
+ em->block_start = SZ_4K;
+ em->block_len = SZ_4K;
+ write_lock(&em_tree->lock);
+ ret = add_extent_mapping(em_tree, em, 0);
+ write_unlock(&em_tree->lock);
+ if (ret < 0) {
+ test_err("cannot add extent range [4K, 8K)");
+ goto out;
+ }
+ free_extent_map(em);
+
+ em = alloc_extent_map();
+ if (!em) {
+ test_std_err(TEST_ALLOC_EXTENT_MAP);
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ /* Add [0, 1K) */
+ em->start = 0;
+ em->len = SZ_1K;
+ em->block_start = EXTENT_MAP_INLINE;
+ em->block_len = (u64)-1;
+ write_lock(&em_tree->lock);
+ ret = btrfs_add_extent_mapping(fs_info, em_tree, &em, em->start, em->len);
+ write_unlock(&em_tree->lock);
+ if (ret) {
+ test_err("case2 [0 1K]: ret %d", ret);
+ goto out;
+ }
+ if (em &&
+ (em->start != 0 || extent_map_end(em) != SZ_1K ||
+ em->block_start != EXTENT_MAP_INLINE || em->block_len != (u64)-1)) {
+ test_err(
+"case2 [0 1K]: ret %d return a wrong em (start %llu len %llu block_start %llu block_len %llu",
+ ret, em->start, em->len, em->block_start,
+ em->block_len);
+ ret = -EINVAL;
+ }
+ free_extent_map(em);
+out:
+ free_extent_map_tree(em_tree);
+
+ return ret;
+}
+
+static int __test_case_3(struct btrfs_fs_info *fs_info,
+ struct extent_map_tree *em_tree, u64 start)
+{
+ struct extent_map *em;
+ u64 len = SZ_4K;
+ int ret;
+
+ em = alloc_extent_map();
+ if (!em) {
+ test_std_err(TEST_ALLOC_EXTENT_MAP);
+ return -ENOMEM;
+ }
+
+ /* Add [4K, 8K) */
+ em->start = SZ_4K;
+ em->len = SZ_4K;
+ em->block_start = SZ_4K;
+ em->block_len = SZ_4K;
+ write_lock(&em_tree->lock);
+ ret = add_extent_mapping(em_tree, em, 0);
+ write_unlock(&em_tree->lock);
+ if (ret < 0) {
+ test_err("cannot add extent range [4K, 8K)");
+ goto out;
+ }
+ free_extent_map(em);
+
+ em = alloc_extent_map();
+ if (!em) {
+ test_std_err(TEST_ALLOC_EXTENT_MAP);
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ /* Add [0, 16K) */
+ em->start = 0;
+ em->len = SZ_16K;
+ em->block_start = 0;
+ em->block_len = SZ_16K;
+ write_lock(&em_tree->lock);
+ ret = btrfs_add_extent_mapping(fs_info, em_tree, &em, start, len);
+ write_unlock(&em_tree->lock);
+ if (ret) {
+ test_err("case3 [0x%llx 0x%llx): ret %d",
+ start, start + len, ret);
+ goto out;
+ }
+ /*
+ * Since bytes within em are contiguous, em->block_start is identical to
+ * em->start.
+ */
+ if (em &&
+ (start < em->start || start + len > extent_map_end(em) ||
+ em->start != em->block_start || em->len != em->block_len)) {
+ test_err(
+"case3 [0x%llx 0x%llx): ret %d em (start 0x%llx len 0x%llx block_start 0x%llx block_len 0x%llx)",
+ start, start + len, ret, em->start, em->len,
+ em->block_start, em->block_len);
+ ret = -EINVAL;
+ }
+ free_extent_map(em);
+out:
+ free_extent_map_tree(em_tree);
+
+ return ret;
+}
+
+/*
+ * Test scenario:
+ *
+ * Suppose that no extent map has been loaded into memory yet.
+ * There is a file extent [0, 16K), two jobs are running concurrently
+ * against it, t1 is buffered writing to [4K, 8K) and t2 is doing dio
+ * read from [0, 4K) or [8K, 12K) or [12K, 16K).
+ *
+ * t1 goes ahead of t2 and adds em [4K, 8K) into tree.
+ *
+ * t1 t2
+ * cow_file_range() btrfs_get_extent()
+ * -> lookup_extent_mapping()
+ * -> add_extent_mapping()
+ * -> add_extent_mapping()
+ */
+static int test_case_3(struct btrfs_fs_info *fs_info,
+ struct extent_map_tree *em_tree)
+{
+ int ret;
+
+ ret = __test_case_3(fs_info, em_tree, 0);
+ if (ret)
+ return ret;
+ ret = __test_case_3(fs_info, em_tree, SZ_8K);
+ if (ret)
+ return ret;
+ ret = __test_case_3(fs_info, em_tree, (12 * SZ_1K));
+
+ return ret;
+}
+
+static int __test_case_4(struct btrfs_fs_info *fs_info,
+ struct extent_map_tree *em_tree, u64 start)
+{
+ struct extent_map *em;
+ u64 len = SZ_4K;
+ int ret;
+
+ em = alloc_extent_map();
+ if (!em) {
+ test_std_err(TEST_ALLOC_EXTENT_MAP);
+ return -ENOMEM;
+ }
+
+ /* Add [0K, 8K) */
+ em->start = 0;
+ em->len = SZ_8K;
+ em->block_start = 0;
+ em->block_len = SZ_8K;
+ write_lock(&em_tree->lock);
+ ret = add_extent_mapping(em_tree, em, 0);
+ write_unlock(&em_tree->lock);
+ if (ret < 0) {
+ test_err("cannot add extent range [0, 8K)");
+ goto out;
+ }
+ free_extent_map(em);
+
+ em = alloc_extent_map();
+ if (!em) {
+ test_std_err(TEST_ALLOC_EXTENT_MAP);
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ /* Add [8K, 32K) */
+ em->start = SZ_8K;
+ em->len = 24 * SZ_1K;
+ em->block_start = SZ_16K; /* avoid merging */
+ em->block_len = 24 * SZ_1K;
+ write_lock(&em_tree->lock);
+ ret = add_extent_mapping(em_tree, em, 0);
+ write_unlock(&em_tree->lock);
+ if (ret < 0) {
+ test_err("cannot add extent range [8K, 32K)");
+ goto out;
+ }
+ free_extent_map(em);
+
+ em = alloc_extent_map();
+ if (!em) {
+ test_std_err(TEST_ALLOC_EXTENT_MAP);
+ ret = -ENOMEM;
+ goto out;
+ }
+ /* Add [0K, 32K) */
+ em->start = 0;
+ em->len = SZ_32K;
+ em->block_start = 0;
+ em->block_len = SZ_32K;
+ write_lock(&em_tree->lock);
+ ret = btrfs_add_extent_mapping(fs_info, em_tree, &em, start, len);
+ write_unlock(&em_tree->lock);
+ if (ret) {
+ test_err("case4 [0x%llx 0x%llx): ret %d",
+ start, len, ret);
+ goto out;
+ }
+ if (em && (start < em->start || start + len > extent_map_end(em))) {
+ test_err(
+"case4 [0x%llx 0x%llx): ret %d, added wrong em (start 0x%llx len 0x%llx block_start 0x%llx block_len 0x%llx)",
+ start, len, ret, em->start, em->len, em->block_start,
+ em->block_len);
+ ret = -EINVAL;
+ }
+ free_extent_map(em);
+out:
+ free_extent_map_tree(em_tree);
+
+ return ret;
+}
+
+/*
+ * Test scenario:
+ *
+ * Suppose that no extent map has been loaded into memory yet.
+ * There is a file extent [0, 32K), two jobs are running concurrently
+ * against it, t1 is doing dio write to [8K, 32K) and t2 is doing dio
+ * read from [0, 4K) or [4K, 8K).
+ *
+ * t1 goes ahead of t2 and splits em [0, 32K) to em [0K, 8K) and [8K 32K).
+ *
+ * t1 t2
+ * btrfs_get_blocks_direct() btrfs_get_blocks_direct()
+ * -> btrfs_get_extent() -> btrfs_get_extent()
+ * -> lookup_extent_mapping()
+ * -> add_extent_mapping() -> lookup_extent_mapping()
+ * # load [0, 32K)
+ * -> btrfs_new_extent_direct()
+ * -> btrfs_drop_extent_cache()
+ * # split [0, 32K)
+ * -> add_extent_mapping()
+ * # add [8K, 32K)
+ * -> add_extent_mapping()
+ * # handle -EEXIST when adding
+ * # [0, 32K)
+ */
+static int test_case_4(struct btrfs_fs_info *fs_info,
+ struct extent_map_tree *em_tree)
+{
+ int ret;
+
+ ret = __test_case_4(fs_info, em_tree, 0);
+ if (ret)
+ return ret;
+ ret = __test_case_4(fs_info, em_tree, SZ_4K);
+
+ return ret;
+}
+
+struct rmap_test_vector {
+ u64 raid_type;
+ u64 physical_start;
+ u64 data_stripe_size;
+ u64 num_data_stripes;
+ u64 num_stripes;
+ /* Assume we won't have more than 5 physical stripes */
+ u64 data_stripe_phys_start[5];
+ bool expected_mapped_addr;
+ /* Physical to logical addresses */
+ u64 mapped_logical[5];
+};
+
+static int test_rmap_block(struct btrfs_fs_info *fs_info,
+ struct rmap_test_vector *test)
+{
+ struct extent_map *em;
+ struct map_lookup *map = NULL;
+ u64 *logical = NULL;
+ int i, out_ndaddrs, out_stripe_len;
+ int ret;
+
+ em = alloc_extent_map();
+ if (!em) {
+ test_std_err(TEST_ALLOC_EXTENT_MAP);
+ return -ENOMEM;
+ }
+
+ map = kmalloc(map_lookup_size(test->num_stripes), GFP_KERNEL);
+ if (!map) {
+ kfree(em);
+ test_std_err(TEST_ALLOC_EXTENT_MAP);
+ return -ENOMEM;
+ }
+
+ set_bit(EXTENT_FLAG_FS_MAPPING, &em->flags);
+ /* Start at 4GiB logical address */
+ em->start = SZ_4G;
+ em->len = test->data_stripe_size * test->num_data_stripes;
+ em->block_len = em->len;
+ em->orig_block_len = test->data_stripe_size;
+ em->map_lookup = map;
+
+ map->num_stripes = test->num_stripes;
+ map->stripe_len = BTRFS_STRIPE_LEN;
+ map->type = test->raid_type;
+
+ for (i = 0; i < map->num_stripes; i++) {
+ struct btrfs_device *dev = btrfs_alloc_dummy_device(fs_info);
+
+ if (IS_ERR(dev)) {
+ test_err("cannot allocate device");
+ ret = PTR_ERR(dev);
+ goto out;
+ }
+ map->stripes[i].dev = dev;
+ map->stripes[i].physical = test->data_stripe_phys_start[i];
+ }
+
+ write_lock(&fs_info->mapping_tree.lock);
+ ret = add_extent_mapping(&fs_info->mapping_tree, em, 0);
+ write_unlock(&fs_info->mapping_tree.lock);
+ if (ret) {
+ test_err("error adding block group mapping to mapping tree");
+ goto out_free;
+ }
+
+ ret = btrfs_rmap_block(fs_info, em->start, NULL, btrfs_sb_offset(1),
+ &logical, &out_ndaddrs, &out_stripe_len);
+ if (ret || (out_ndaddrs == 0 && test->expected_mapped_addr)) {
+ test_err("didn't rmap anything but expected %d",
+ test->expected_mapped_addr);
+ goto out;
+ }
+
+ if (out_stripe_len != BTRFS_STRIPE_LEN) {
+ test_err("calculated stripe length doesn't match");
+ goto out;
+ }
+
+ if (out_ndaddrs != test->expected_mapped_addr) {
+ for (i = 0; i < out_ndaddrs; i++)
+ test_msg("mapped %llu", logical[i]);
+ test_err("unexpected number of mapped addresses: %d", out_ndaddrs);
+ goto out;
+ }
+
+ for (i = 0; i < out_ndaddrs; i++) {
+ if (logical[i] != test->mapped_logical[i]) {
+ test_err("unexpected logical address mapped");
+ goto out;
+ }
+ }
+
+ ret = 0;
+out:
+ write_lock(&fs_info->mapping_tree.lock);
+ remove_extent_mapping(&fs_info->mapping_tree, em);
+ write_unlock(&fs_info->mapping_tree.lock);
+ /* For us */
+ free_extent_map(em);
+out_free:
+ /* For the tree */
+ free_extent_map(em);
+ kfree(logical);
+ return ret;
+}
+
+int btrfs_test_extent_map(void)
+{
+ struct btrfs_fs_info *fs_info = NULL;
+ struct extent_map_tree *em_tree;
+ int ret = 0, i;
+ struct rmap_test_vector rmap_tests[] = {
+ {
+ /*
+ * Test a chunk with 2 data stripes one of which
+ * intersects the physical address of the super block
+ * is correctly recognised.
+ */
+ .raid_type = BTRFS_BLOCK_GROUP_RAID1,
+ .physical_start = SZ_64M - SZ_4M,
+ .data_stripe_size = SZ_256M,
+ .num_data_stripes = 2,
+ .num_stripes = 2,
+ .data_stripe_phys_start =
+ {SZ_64M - SZ_4M, SZ_64M - SZ_4M + SZ_256M},
+ .expected_mapped_addr = true,
+ .mapped_logical= {SZ_4G + SZ_4M}
+ },
+ {
+ /*
+ * Test that out-of-range physical addresses are
+ * ignored
+ */
+
+ /* SINGLE chunk type */
+ .raid_type = 0,
+ .physical_start = SZ_4G,
+ .data_stripe_size = SZ_256M,
+ .num_data_stripes = 1,
+ .num_stripes = 1,
+ .data_stripe_phys_start = {SZ_256M},
+ .expected_mapped_addr = false,
+ .mapped_logical = {0}
+ }
+ };
+
+ test_msg("running extent_map tests");
+
+ /*
+ * Note: the fs_info is not set up completely, we only need
+ * fs_info::fsid for the tracepoint.
+ */
+ fs_info = btrfs_alloc_dummy_fs_info(PAGE_SIZE, PAGE_SIZE);
+ if (!fs_info) {
+ test_std_err(TEST_ALLOC_FS_INFO);
+ return -ENOMEM;
+ }
+
+ em_tree = kzalloc(sizeof(*em_tree), GFP_KERNEL);
+ if (!em_tree) {
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ extent_map_tree_init(em_tree);
+
+ ret = test_case_1(fs_info, em_tree);
+ if (ret)
+ goto out;
+ ret = test_case_2(fs_info, em_tree);
+ if (ret)
+ goto out;
+ ret = test_case_3(fs_info, em_tree);
+ if (ret)
+ goto out;
+ ret = test_case_4(fs_info, em_tree);
+
+ test_msg("running rmap tests");
+ for (i = 0; i < ARRAY_SIZE(rmap_tests); i++) {
+ ret = test_rmap_block(fs_info, &rmap_tests[i]);
+ if (ret)
+ goto out;
+ }
+
+out:
+ kfree(em_tree);
+ btrfs_free_dummy_fs_info(fs_info);
+
+ return ret;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-12 21:37:28 +0000