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-rw-r--r--fs/btrfs/tests/extent-io-tests.c612
1 files changed, 612 insertions, 0 deletions
diff --git a/fs/btrfs/tests/extent-io-tests.c b/fs/btrfs/tests/extent-io-tests.c
new file mode 100644
index 000000000..350da449d
--- /dev/null
+++ b/fs/btrfs/tests/extent-io-tests.c
@@ -0,0 +1,612 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2013 Fusion IO. All rights reserved.
+ */
+
+#include <linux/pagemap.h>
+#include <linux/pagevec.h>
+#include <linux/sched.h>
+#include <linux/slab.h>
+#include <linux/sizes.h>
+#include "btrfs-tests.h"
+#include "../ctree.h"
+#include "../extent_io.h"
+#include "../btrfs_inode.h"
+
+#define PROCESS_UNLOCK (1 << 0)
+#define PROCESS_RELEASE (1 << 1)
+#define PROCESS_TEST_LOCKED (1 << 2)
+
+static noinline int process_page_range(struct inode *inode, u64 start, u64 end,
+ unsigned long flags)
+{
+ int ret;
+ struct folio_batch fbatch;
+ unsigned long index = start >> PAGE_SHIFT;
+ unsigned long end_index = end >> PAGE_SHIFT;
+ int i;
+ int count = 0;
+ int loops = 0;
+
+ folio_batch_init(&fbatch);
+
+ while (index <= end_index) {
+ ret = filemap_get_folios_contig(inode->i_mapping, &index,
+ end_index, &fbatch);
+ for (i = 0; i < ret; i++) {
+ struct folio *folio = fbatch.folios[i];
+
+ if (flags & PROCESS_TEST_LOCKED &&
+ !folio_test_locked(folio))
+ count++;
+ if (flags & PROCESS_UNLOCK && folio_test_locked(folio))
+ folio_unlock(folio);
+ if (flags & PROCESS_RELEASE)
+ folio_put(folio);
+ }
+ folio_batch_release(&fbatch);
+ cond_resched();
+ loops++;
+ if (loops > 100000) {
+ printk(KERN_ERR
+ "stuck in a loop, start %llu, end %llu, ret %d\n",
+ start, end, ret);
+ break;
+ }
+ }
+
+ return count;
+}
+
+#define STATE_FLAG_STR_LEN 256
+
+#define PRINT_ONE_FLAG(state, dest, cur, name) \
+({ \
+ if (state->state & EXTENT_##name) \
+ cur += scnprintf(dest + cur, STATE_FLAG_STR_LEN - cur, \
+ "%s" #name, cur == 0 ? "" : "|"); \
+})
+
+static void extent_flag_to_str(const struct extent_state *state, char *dest)
+{
+ int cur = 0;
+
+ dest[0] = 0;
+ PRINT_ONE_FLAG(state, dest, cur, DIRTY);
+ PRINT_ONE_FLAG(state, dest, cur, UPTODATE);
+ PRINT_ONE_FLAG(state, dest, cur, LOCKED);
+ PRINT_ONE_FLAG(state, dest, cur, NEW);
+ PRINT_ONE_FLAG(state, dest, cur, DELALLOC);
+ PRINT_ONE_FLAG(state, dest, cur, DEFRAG);
+ PRINT_ONE_FLAG(state, dest, cur, BOUNDARY);
+ PRINT_ONE_FLAG(state, dest, cur, NODATASUM);
+ PRINT_ONE_FLAG(state, dest, cur, CLEAR_META_RESV);
+ PRINT_ONE_FLAG(state, dest, cur, NEED_WAIT);
+ PRINT_ONE_FLAG(state, dest, cur, NORESERVE);
+ PRINT_ONE_FLAG(state, dest, cur, QGROUP_RESERVED);
+ PRINT_ONE_FLAG(state, dest, cur, CLEAR_DATA_RESV);
+}
+
+static void dump_extent_io_tree(const struct extent_io_tree *tree)
+{
+ struct rb_node *node;
+ char flags_str[STATE_FLAG_STR_LEN];
+
+ node = rb_first(&tree->state);
+ test_msg("io tree content:");
+ while (node) {
+ struct extent_state *state;
+
+ state = rb_entry(node, struct extent_state, rb_node);
+ extent_flag_to_str(state, flags_str);
+ test_msg(" start=%llu len=%llu flags=%s", state->start,
+ state->end + 1 - state->start, flags_str);
+ node = rb_next(node);
+ }
+}
+
+static int test_find_delalloc(u32 sectorsize)
+{
+ struct inode *inode;
+ struct extent_io_tree *tmp;
+ struct page *page;
+ struct page *locked_page = NULL;
+ unsigned long index = 0;
+ /* In this test we need at least 2 file extents at its maximum size */
+ u64 max_bytes = BTRFS_MAX_EXTENT_SIZE;
+ u64 total_dirty = 2 * max_bytes;
+ u64 start, end, test_start;
+ bool found;
+ int ret = -EINVAL;
+
+ test_msg("running find delalloc tests");
+
+ inode = btrfs_new_test_inode();
+ if (!inode) {
+ test_std_err(TEST_ALLOC_INODE);
+ return -ENOMEM;
+ }
+ tmp = &BTRFS_I(inode)->io_tree;
+
+ /*
+ * Passing NULL as we don't have fs_info but tracepoints are not used
+ * at this point
+ */
+ extent_io_tree_init(NULL, tmp, IO_TREE_SELFTEST, NULL);
+
+ /*
+ * First go through and create and mark all of our pages dirty, we pin
+ * everything to make sure our pages don't get evicted and screw up our
+ * test.
+ */
+ for (index = 0; index < (total_dirty >> PAGE_SHIFT); index++) {
+ page = find_or_create_page(inode->i_mapping, index, GFP_KERNEL);
+ if (!page) {
+ test_err("failed to allocate test page");
+ ret = -ENOMEM;
+ goto out;
+ }
+ SetPageDirty(page);
+ if (index) {
+ unlock_page(page);
+ } else {
+ get_page(page);
+ locked_page = page;
+ }
+ }
+
+ /* Test this scenario
+ * |--- delalloc ---|
+ * |--- search ---|
+ */
+ set_extent_delalloc(tmp, 0, sectorsize - 1, 0, NULL);
+ start = 0;
+ end = start + PAGE_SIZE - 1;
+ found = find_lock_delalloc_range(inode, locked_page, &start,
+ &end);
+ if (!found) {
+ test_err("should have found at least one delalloc");
+ goto out_bits;
+ }
+ if (start != 0 || end != (sectorsize - 1)) {
+ test_err("expected start 0 end %u, got start %llu end %llu",
+ sectorsize - 1, start, end);
+ goto out_bits;
+ }
+ unlock_extent(tmp, start, end, NULL);
+ unlock_page(locked_page);
+ put_page(locked_page);
+
+ /*
+ * Test this scenario
+ *
+ * |--- delalloc ---|
+ * |--- search ---|
+ */
+ test_start = SZ_64M;
+ locked_page = find_lock_page(inode->i_mapping,
+ test_start >> PAGE_SHIFT);
+ if (!locked_page) {
+ test_err("couldn't find the locked page");
+ goto out_bits;
+ }
+ set_extent_delalloc(tmp, sectorsize, max_bytes - 1, 0, NULL);
+ start = test_start;
+ end = start + PAGE_SIZE - 1;
+ found = find_lock_delalloc_range(inode, locked_page, &start,
+ &end);
+ if (!found) {
+ test_err("couldn't find delalloc in our range");
+ goto out_bits;
+ }
+ if (start != test_start || end != max_bytes - 1) {
+ test_err("expected start %llu end %llu, got start %llu, end %llu",
+ test_start, max_bytes - 1, start, end);
+ goto out_bits;
+ }
+ if (process_page_range(inode, start, end,
+ PROCESS_TEST_LOCKED | PROCESS_UNLOCK)) {
+ test_err("there were unlocked pages in the range");
+ goto out_bits;
+ }
+ unlock_extent(tmp, start, end, NULL);
+ /* locked_page was unlocked above */
+ put_page(locked_page);
+
+ /*
+ * Test this scenario
+ * |--- delalloc ---|
+ * |--- search ---|
+ */
+ test_start = max_bytes + sectorsize;
+ locked_page = find_lock_page(inode->i_mapping, test_start >>
+ PAGE_SHIFT);
+ if (!locked_page) {
+ test_err("couldn't find the locked page");
+ goto out_bits;
+ }
+ start = test_start;
+ end = start + PAGE_SIZE - 1;
+ found = find_lock_delalloc_range(inode, locked_page, &start,
+ &end);
+ if (found) {
+ test_err("found range when we shouldn't have");
+ goto out_bits;
+ }
+ if (end != test_start + PAGE_SIZE - 1) {
+ test_err("did not return the proper end offset");
+ goto out_bits;
+ }
+
+ /*
+ * Test this scenario
+ * [------- delalloc -------|
+ * [max_bytes]|-- search--|
+ *
+ * We are re-using our test_start from above since it works out well.
+ */
+ set_extent_delalloc(tmp, max_bytes, total_dirty - 1, 0, NULL);
+ start = test_start;
+ end = start + PAGE_SIZE - 1;
+ found = find_lock_delalloc_range(inode, locked_page, &start,
+ &end);
+ if (!found) {
+ test_err("didn't find our range");
+ goto out_bits;
+ }
+ if (start != test_start || end != total_dirty - 1) {
+ test_err("expected start %llu end %llu, got start %llu end %llu",
+ test_start, total_dirty - 1, start, end);
+ goto out_bits;
+ }
+ if (process_page_range(inode, start, end,
+ PROCESS_TEST_LOCKED | PROCESS_UNLOCK)) {
+ test_err("pages in range were not all locked");
+ goto out_bits;
+ }
+ unlock_extent(tmp, start, end, NULL);
+
+ /*
+ * Now to test where we run into a page that is no longer dirty in the
+ * range we want to find.
+ */
+ page = find_get_page(inode->i_mapping,
+ (max_bytes + SZ_1M) >> PAGE_SHIFT);
+ if (!page) {
+ test_err("couldn't find our page");
+ goto out_bits;
+ }
+ ClearPageDirty(page);
+ put_page(page);
+
+ /* We unlocked it in the previous test */
+ lock_page(locked_page);
+ start = test_start;
+ end = start + PAGE_SIZE - 1;
+ /*
+ * Currently if we fail to find dirty pages in the delalloc range we
+ * will adjust max_bytes down to PAGE_SIZE and then re-search. If
+ * this changes at any point in the future we will need to fix this
+ * tests expected behavior.
+ */
+ found = find_lock_delalloc_range(inode, locked_page, &start,
+ &end);
+ if (!found) {
+ test_err("didn't find our range");
+ goto out_bits;
+ }
+ if (start != test_start && end != test_start + PAGE_SIZE - 1) {
+ test_err("expected start %llu end %llu, got start %llu end %llu",
+ test_start, test_start + PAGE_SIZE - 1, start, end);
+ goto out_bits;
+ }
+ if (process_page_range(inode, start, end, PROCESS_TEST_LOCKED |
+ PROCESS_UNLOCK)) {
+ test_err("pages in range were not all locked");
+ goto out_bits;
+ }
+ ret = 0;
+out_bits:
+ if (ret)
+ dump_extent_io_tree(tmp);
+ clear_extent_bits(tmp, 0, total_dirty - 1, (unsigned)-1);
+out:
+ if (locked_page)
+ put_page(locked_page);
+ process_page_range(inode, 0, total_dirty - 1,
+ PROCESS_UNLOCK | PROCESS_RELEASE);
+ iput(inode);
+ return ret;
+}
+
+static int check_eb_bitmap(unsigned long *bitmap, struct extent_buffer *eb,
+ unsigned long len)
+{
+ unsigned long i;
+
+ for (i = 0; i < len * BITS_PER_BYTE; i++) {
+ int bit, bit1;
+
+ bit = !!test_bit(i, bitmap);
+ bit1 = !!extent_buffer_test_bit(eb, 0, i);
+ if (bit1 != bit) {
+ test_err("bits do not match");
+ return -EINVAL;
+ }
+
+ bit1 = !!extent_buffer_test_bit(eb, i / BITS_PER_BYTE,
+ i % BITS_PER_BYTE);
+ if (bit1 != bit) {
+ test_err("offset bits do not match");
+ return -EINVAL;
+ }
+ }
+ return 0;
+}
+
+static int __test_eb_bitmaps(unsigned long *bitmap, struct extent_buffer *eb,
+ unsigned long len)
+{
+ unsigned long i, j;
+ u32 x;
+ int ret;
+
+ memset(bitmap, 0, len);
+ memzero_extent_buffer(eb, 0, len);
+ if (memcmp_extent_buffer(eb, bitmap, 0, len) != 0) {
+ test_err("bitmap was not zeroed");
+ return -EINVAL;
+ }
+
+ bitmap_set(bitmap, 0, len * BITS_PER_BYTE);
+ extent_buffer_bitmap_set(eb, 0, 0, len * BITS_PER_BYTE);
+ ret = check_eb_bitmap(bitmap, eb, len);
+ if (ret) {
+ test_err("setting all bits failed");
+ return ret;
+ }
+
+ bitmap_clear(bitmap, 0, len * BITS_PER_BYTE);
+ extent_buffer_bitmap_clear(eb, 0, 0, len * BITS_PER_BYTE);
+ ret = check_eb_bitmap(bitmap, eb, len);
+ if (ret) {
+ test_err("clearing all bits failed");
+ return ret;
+ }
+
+ /* Straddling pages test */
+ if (len > PAGE_SIZE) {
+ bitmap_set(bitmap,
+ (PAGE_SIZE - sizeof(long) / 2) * BITS_PER_BYTE,
+ sizeof(long) * BITS_PER_BYTE);
+ extent_buffer_bitmap_set(eb, PAGE_SIZE - sizeof(long) / 2, 0,
+ sizeof(long) * BITS_PER_BYTE);
+ ret = check_eb_bitmap(bitmap, eb, len);
+ if (ret) {
+ test_err("setting straddling pages failed");
+ return ret;
+ }
+
+ bitmap_set(bitmap, 0, len * BITS_PER_BYTE);
+ bitmap_clear(bitmap,
+ (PAGE_SIZE - sizeof(long) / 2) * BITS_PER_BYTE,
+ sizeof(long) * BITS_PER_BYTE);
+ extent_buffer_bitmap_set(eb, 0, 0, len * BITS_PER_BYTE);
+ extent_buffer_bitmap_clear(eb, PAGE_SIZE - sizeof(long) / 2, 0,
+ sizeof(long) * BITS_PER_BYTE);
+ ret = check_eb_bitmap(bitmap, eb, len);
+ if (ret) {
+ test_err("clearing straddling pages failed");
+ return ret;
+ }
+ }
+
+ /*
+ * Generate a wonky pseudo-random bit pattern for the sake of not using
+ * something repetitive that could miss some hypothetical off-by-n bug.
+ */
+ x = 0;
+ bitmap_clear(bitmap, 0, len * BITS_PER_BYTE);
+ extent_buffer_bitmap_clear(eb, 0, 0, len * BITS_PER_BYTE);
+ for (i = 0; i < len * BITS_PER_BYTE / 32; i++) {
+ x = (0x19660dULL * (u64)x + 0x3c6ef35fULL) & 0xffffffffU;
+ for (j = 0; j < 32; j++) {
+ if (x & (1U << j)) {
+ bitmap_set(bitmap, i * 32 + j, 1);
+ extent_buffer_bitmap_set(eb, 0, i * 32 + j, 1);
+ }
+ }
+ }
+
+ ret = check_eb_bitmap(bitmap, eb, len);
+ if (ret) {
+ test_err("random bit pattern failed");
+ return ret;
+ }
+
+ return 0;
+}
+
+static int test_eb_bitmaps(u32 sectorsize, u32 nodesize)
+{
+ struct btrfs_fs_info *fs_info;
+ unsigned long *bitmap = NULL;
+ struct extent_buffer *eb = NULL;
+ int ret;
+
+ test_msg("running extent buffer bitmap tests");
+
+ fs_info = btrfs_alloc_dummy_fs_info(nodesize, sectorsize);
+ if (!fs_info) {
+ test_std_err(TEST_ALLOC_FS_INFO);
+ return -ENOMEM;
+ }
+
+ bitmap = kmalloc(nodesize, GFP_KERNEL);
+ if (!bitmap) {
+ test_err("couldn't allocate test bitmap");
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ eb = __alloc_dummy_extent_buffer(fs_info, 0, nodesize);
+ if (!eb) {
+ test_std_err(TEST_ALLOC_ROOT);
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ ret = __test_eb_bitmaps(bitmap, eb, nodesize);
+ if (ret)
+ goto out;
+
+ free_extent_buffer(eb);
+
+ /*
+ * Test again for case where the tree block is sectorsize aligned but
+ * not nodesize aligned.
+ */
+ eb = __alloc_dummy_extent_buffer(fs_info, sectorsize, nodesize);
+ if (!eb) {
+ test_std_err(TEST_ALLOC_ROOT);
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ ret = __test_eb_bitmaps(bitmap, eb, nodesize);
+out:
+ free_extent_buffer(eb);
+ kfree(bitmap);
+ btrfs_free_dummy_fs_info(fs_info);
+ return ret;
+}
+
+static int test_find_first_clear_extent_bit(void)
+{
+ struct extent_io_tree tree;
+ u64 start, end;
+ int ret = -EINVAL;
+
+ test_msg("running find_first_clear_extent_bit test");
+
+ extent_io_tree_init(NULL, &tree, IO_TREE_SELFTEST, NULL);
+
+ /* Test correct handling of empty tree */
+ find_first_clear_extent_bit(&tree, 0, &start, &end, CHUNK_TRIMMED);
+ if (start != 0 || end != -1) {
+ test_err(
+ "error getting a range from completely empty tree: start %llu end %llu",
+ start, end);
+ goto out;
+ }
+ /*
+ * Set 1M-4M alloc/discard and 32M-64M thus leaving a hole between
+ * 4M-32M
+ */
+ set_extent_bits(&tree, SZ_1M, SZ_4M - 1,
+ CHUNK_TRIMMED | CHUNK_ALLOCATED);
+
+ find_first_clear_extent_bit(&tree, SZ_512K, &start, &end,
+ CHUNK_TRIMMED | CHUNK_ALLOCATED);
+
+ if (start != 0 || end != SZ_1M - 1) {
+ test_err("error finding beginning range: start %llu end %llu",
+ start, end);
+ goto out;
+ }
+
+ /* Now add 32M-64M so that we have a hole between 4M-32M */
+ set_extent_bits(&tree, SZ_32M, SZ_64M - 1,
+ CHUNK_TRIMMED | CHUNK_ALLOCATED);
+
+ /*
+ * Request first hole starting at 12M, we should get 4M-32M
+ */
+ find_first_clear_extent_bit(&tree, 12 * SZ_1M, &start, &end,
+ CHUNK_TRIMMED | CHUNK_ALLOCATED);
+
+ if (start != SZ_4M || end != SZ_32M - 1) {
+ test_err("error finding trimmed range: start %llu end %llu",
+ start, end);
+ goto out;
+ }
+
+ /*
+ * Search in the middle of allocated range, should get the next one
+ * available, which happens to be unallocated -> 4M-32M
+ */
+ find_first_clear_extent_bit(&tree, SZ_2M, &start, &end,
+ CHUNK_TRIMMED | CHUNK_ALLOCATED);
+
+ if (start != SZ_4M || end != SZ_32M - 1) {
+ test_err("error finding next unalloc range: start %llu end %llu",
+ start, end);
+ goto out;
+ }
+
+ /*
+ * Set 64M-72M with CHUNK_ALLOC flag, then search for CHUNK_TRIMMED flag
+ * being unset in this range, we should get the entry in range 64M-72M
+ */
+ set_extent_bits(&tree, SZ_64M, SZ_64M + SZ_8M - 1, CHUNK_ALLOCATED);
+ find_first_clear_extent_bit(&tree, SZ_64M + SZ_1M, &start, &end,
+ CHUNK_TRIMMED);
+
+ if (start != SZ_64M || end != SZ_64M + SZ_8M - 1) {
+ test_err("error finding exact range: start %llu end %llu",
+ start, end);
+ goto out;
+ }
+
+ find_first_clear_extent_bit(&tree, SZ_64M - SZ_8M, &start, &end,
+ CHUNK_TRIMMED);
+
+ /*
+ * Search in the middle of set range whose immediate neighbour doesn't
+ * have the bits set so it must be returned
+ */
+ if (start != SZ_64M || end != SZ_64M + SZ_8M - 1) {
+ test_err("error finding next alloc range: start %llu end %llu",
+ start, end);
+ goto out;
+ }
+
+ /*
+ * Search beyond any known range, shall return after last known range
+ * and end should be -1
+ */
+ find_first_clear_extent_bit(&tree, -1, &start, &end, CHUNK_TRIMMED);
+ if (start != SZ_64M + SZ_8M || end != -1) {
+ test_err(
+ "error handling beyond end of range search: start %llu end %llu",
+ start, end);
+ goto out;
+ }
+
+ ret = 0;
+out:
+ if (ret)
+ dump_extent_io_tree(&tree);
+ clear_extent_bits(&tree, 0, (u64)-1, CHUNK_TRIMMED | CHUNK_ALLOCATED);
+
+ return ret;
+}
+
+int btrfs_test_extent_io(u32 sectorsize, u32 nodesize)
+{
+ int ret;
+
+ test_msg("running extent I/O tests");
+
+ ret = test_find_delalloc(sectorsize);
+ if (ret)
+ goto out;
+
+ ret = test_find_first_clear_extent_bit();
+ if (ret)
+ goto out;
+
+ ret = test_eb_bitmaps(sectorsize, nodesize);
+out:
+ return ret;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-23 16:26:18 +0000