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-rw-r--r--fs/btrfs/tests/extent-map-tests.c1047
1 files changed, 1047 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 0000000000..29bdd08b24
--- /dev/null
+++ b/fs/btrfs/tests/extent-map-tests.c
@@ -0,0 +1,1047 @@
+// 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 "../btrfs_inode.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;
+}
+
+static int add_compressed_extent(struct extent_map_tree *em_tree,
+ u64 start, u64 len, u64 block_start)
+{
+ struct extent_map *em;
+ int ret;
+
+ em = alloc_extent_map();
+ if (!em) {
+ test_std_err(TEST_ALLOC_EXTENT_MAP);
+ return -ENOMEM;
+ }
+
+ em->start = start;
+ em->len = len;
+ em->block_start = block_start;
+ em->block_len = SZ_4K;
+ set_bit(EXTENT_FLAG_COMPRESSED, &em->flags);
+ write_lock(&em_tree->lock);
+ ret = add_extent_mapping(em_tree, em, 0);
+ write_unlock(&em_tree->lock);
+ free_extent_map(em);
+ if (ret < 0) {
+ test_err("cannot add extent map [%llu, %llu)", start, start + len);
+ return ret;
+ }
+
+ return 0;
+}
+
+struct extent_range {
+ u64 start;
+ u64 len;
+};
+
+/* The valid states of the tree after every drop, as described below. */
+struct extent_range valid_ranges[][7] = {
+ {
+ { .start = 0, .len = SZ_8K }, /* [0, 8K) */
+ { .start = SZ_4K * 3, .len = SZ_4K * 3}, /* [12k, 24k) */
+ { .start = SZ_4K * 6, .len = SZ_4K * 3}, /* [24k, 36k) */
+ { .start = SZ_32K + SZ_4K, .len = SZ_4K}, /* [36k, 40k) */
+ { .start = SZ_4K * 10, .len = SZ_4K * 6}, /* [40k, 64k) */
+ },
+ {
+ { .start = 0, .len = SZ_8K }, /* [0, 8K) */
+ { .start = SZ_4K * 5, .len = SZ_4K}, /* [20k, 24k) */
+ { .start = SZ_4K * 6, .len = SZ_4K * 3}, /* [24k, 36k) */
+ { .start = SZ_32K + SZ_4K, .len = SZ_4K}, /* [36k, 40k) */
+ { .start = SZ_4K * 10, .len = SZ_4K * 6}, /* [40k, 64k) */
+ },
+ {
+ { .start = 0, .len = SZ_8K }, /* [0, 8K) */
+ { .start = SZ_4K * 5, .len = SZ_4K}, /* [20k, 24k) */
+ { .start = SZ_4K * 6, .len = SZ_4K}, /* [24k, 28k) */
+ { .start = SZ_32K, .len = SZ_4K}, /* [32k, 36k) */
+ { .start = SZ_32K + SZ_4K, .len = SZ_4K}, /* [36k, 40k) */
+ { .start = SZ_4K * 10, .len = SZ_4K * 6}, /* [40k, 64k) */
+ },
+ {
+ { .start = 0, .len = SZ_8K}, /* [0, 8K) */
+ { .start = SZ_4K * 5, .len = SZ_4K}, /* [20k, 24k) */
+ { .start = SZ_4K * 6, .len = SZ_4K}, /* [24k, 28k) */
+ }
+};
+
+static int validate_range(struct extent_map_tree *em_tree, int index)
+{
+ struct rb_node *n;
+ int i;
+
+ for (i = 0, n = rb_first_cached(&em_tree->map);
+ valid_ranges[index][i].len && n;
+ i++, n = rb_next(n)) {
+ struct extent_map *entry = rb_entry(n, struct extent_map, rb_node);
+
+ if (entry->start != valid_ranges[index][i].start) {
+ test_err("mapping has start %llu expected %llu",
+ entry->start, valid_ranges[index][i].start);
+ return -EINVAL;
+ }
+
+ if (entry->len != valid_ranges[index][i].len) {
+ test_err("mapping has len %llu expected %llu",
+ entry->len, valid_ranges[index][i].len);
+ return -EINVAL;
+ }
+ }
+
+ /*
+ * We exited because we don't have any more entries in the extent_map
+ * but we still expect more valid entries.
+ */
+ if (valid_ranges[index][i].len) {
+ test_err("missing an entry");
+ return -EINVAL;
+ }
+
+ /* We exited the loop but still have entries in the extent map. */
+ if (n) {
+ test_err("we have a left over entry in the extent map we didn't expect");
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+/*
+ * Test scenario:
+ *
+ * Test the various edge cases of btrfs_drop_extent_map_range, create the
+ * following ranges
+ *
+ * [0, 12k)[12k, 24k)[24k, 36k)[36k, 40k)[40k,64k)
+ *
+ * And then we'll drop:
+ *
+ * [8k, 12k) - test the single front split
+ * [12k, 20k) - test the single back split
+ * [28k, 32k) - test the double split
+ * [32k, 64k) - test whole em dropping
+ *
+ * They'll have the EXTENT_FLAG_COMPRESSED flag set to keep the em tree from
+ * merging the em's.
+ */
+static int test_case_5(void)
+{
+ struct extent_map_tree *em_tree;
+ struct inode *inode;
+ u64 start, end;
+ int ret;
+
+ test_msg("Running btrfs_drop_extent_map_range tests");
+
+ inode = btrfs_new_test_inode();
+ if (!inode) {
+ test_std_err(TEST_ALLOC_INODE);
+ return -ENOMEM;
+ }
+
+ em_tree = &BTRFS_I(inode)->extent_tree;
+
+ /* [0, 12k) */
+ ret = add_compressed_extent(em_tree, 0, SZ_4K * 3, 0);
+ if (ret) {
+ test_err("cannot add extent range [0, 12K)");
+ goto out;
+ }
+
+ /* [12k, 24k) */
+ ret = add_compressed_extent(em_tree, SZ_4K * 3, SZ_4K * 3, SZ_4K);
+ if (ret) {
+ test_err("cannot add extent range [12k, 24k)");
+ goto out;
+ }
+
+ /* [24k, 36k) */
+ ret = add_compressed_extent(em_tree, SZ_4K * 6, SZ_4K * 3, SZ_8K);
+ if (ret) {
+ test_err("cannot add extent range [12k, 24k)");
+ goto out;
+ }
+
+ /* [36k, 40k) */
+ ret = add_compressed_extent(em_tree, SZ_32K + SZ_4K, SZ_4K, SZ_4K * 3);
+ if (ret) {
+ test_err("cannot add extent range [12k, 24k)");
+ goto out;
+ }
+
+ /* [40k, 64k) */
+ ret = add_compressed_extent(em_tree, SZ_4K * 10, SZ_4K * 6, SZ_16K);
+ if (ret) {
+ test_err("cannot add extent range [12k, 24k)");
+ goto out;
+ }
+
+ /* Drop [8k, 12k) */
+ start = SZ_8K;
+ end = (3 * SZ_4K) - 1;
+ btrfs_drop_extent_map_range(BTRFS_I(inode), start, end, false);
+ ret = validate_range(&BTRFS_I(inode)->extent_tree, 0);
+ if (ret)
+ goto out;
+
+ /* Drop [12k, 20k) */
+ start = SZ_4K * 3;
+ end = SZ_16K + SZ_4K - 1;
+ btrfs_drop_extent_map_range(BTRFS_I(inode), start, end, false);
+ ret = validate_range(&BTRFS_I(inode)->extent_tree, 1);
+ if (ret)
+ goto out;
+
+ /* Drop [28k, 32k) */
+ start = SZ_32K - SZ_4K;
+ end = SZ_32K - 1;
+ btrfs_drop_extent_map_range(BTRFS_I(inode), start, end, false);
+ ret = validate_range(&BTRFS_I(inode)->extent_tree, 2);
+ if (ret)
+ goto out;
+
+ /* Drop [32k, 64k) */
+ start = SZ_32K;
+ end = SZ_64K - 1;
+ btrfs_drop_extent_map_range(BTRFS_I(inode), start, end, false);
+ ret = validate_range(&BTRFS_I(inode)->extent_tree, 3);
+ if (ret)
+ goto out;
+out:
+ iput(inode);
+ 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;
+}
+
+/*
+ * 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;
+ 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->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, 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);
+ if (ret)
+ goto out;
+ ret = test_case_5();
+ if (ret)
+ goto out;
+ 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++) {
+ 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 2024-11-27 15:24:57 +0000