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linux-net/fs/ext4/extents-test.c
Ye Bin 9e1b14320b ext4: fix extents-test.c is not compiled when EXT4_KUNIT_TESTS=M 
Now, only EXT4_KUNIT_TESTS=Y testcase will be compiled in 'extents.c'.
To solve this issue, the ext4 test code needs to be decoupled. The
'extents-test' module is compiled into 'ext4-test' module.

Fixes: cb1e0c1d1f ("ext4: kunit tests for extent splitting and conversion")
Signed-off-by: Ye Bin <yebin10@huawei.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Link: https://patch.msgid.link/20260314075258.1317579-4-yebin@huaweicloud.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
2026-03-27 23:36:06 -04:00

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// SPDX-License-Identifier: GPL-2.0
/*
* Written by Ojaswin Mujoo <ojaswin@linux.ibm.com> (IBM)
*
* These Kunit tests are designed to test the functionality of
* extent split and conversion in ext4.
*
* Currently, ext4 can split extents in 2 ways:
* 1. By splitting the extents in the extent tree and optionally converting them
* to written or unwritten based on flags passed.
* 2. In case 1 encounters an error, ext4 instead zerooes out the unwritten
* areas of the extent and marks the complete extent written.
*
* The primary function that handles this is ext4_split_convert_extents().
*
* We test both of the methods of split. The behavior we try to enforce is:
* 1. When passing EXT4_GET_BLOCKS_CONVERT flag to ext4_split_convert_extents(),
* the split extent should be converted to initialized.
* 2. When passing EXT4_GET_BLOCKS_CONVERT_UNWRITTEN flag to
* ext4_split_convert_extents(), the split extent should be converted to
* uninitialized.
* 3. In case we use the zeroout method, then we should correctly write zeroes
* to the unwritten areas of the extent and we should not corrupt/leak any
* data.
*
* Enforcing 1 and 2 is straight forward, we just setup a minimal inode with
* extent tree, call ext4_split_convert_extents() and check the final state of
* the extent tree.
*
* For zeroout testing, we maintain a separate buffer which represents the disk
* data corresponding to the extents. We then override ext4's zeroout functions
* to instead write zeroes to our buffer. Then, we override
* ext4_ext_insert_extent() to return -ENOSPC, which triggers the zeroout.
* Finally, we check the state of the extent tree and zeroout buffer to confirm
* everything went well.
*/
#include <kunit/test.h>
#include <kunit/static_stub.h>
#include <linux/gfp_types.h>
#include <linux/stddef.h>
#include "ext4.h"
#include "ext4_extents.h"
#define EXT_DATA_PBLK 100
#define EXT_DATA_LBLK 10
#define EXT_DATA_LEN 3
struct kunit_ctx {
/*
* Ext4 inode which has only 1 unwrit extent
*/
struct ext4_inode_info *k_ei;
/*
* Represents the underlying data area (used for zeroout testing)
*/
char *k_data;
} k_ctx;
/*
* describes the state of an expected extent in extent tree.
*/
struct kunit_ext_state {
ext4_lblk_t ex_lblk;
ext4_lblk_t ex_len;
bool is_unwrit;
};
/*
* describes the state of the data area of a writ extent. Used for testing
* correctness of zeroout.
*/
struct kunit_ext_data_state {
char exp_char;
ext4_lblk_t off_blk;
ext4_lblk_t len_blk;
};
enum kunit_test_types {
TEST_SPLIT_CONVERT,
TEST_CREATE_BLOCKS,
};
struct kunit_ext_test_param {
/* description of test */
char *desc;
/* determines which function will be tested */
int type;
/* is extent unwrit at beginning of test */
bool is_unwrit_at_start;
/* flags to pass while splitting */
int split_flags;
/* map describing range to split */
struct ext4_map_blocks split_map;
/* disable zeroout */
bool disable_zeroout;
/* no of extents expected after split */
int nr_exp_ext;
/*
* expected state of extents after split. We will never split into more
* than 3 extents
*/
struct kunit_ext_state exp_ext_state[3];
/* Below fields used for zeroout tests */
bool is_zeroout_test;
/*
* no of expected data segments (zeroout tests). Example, if we expect
* data to be 4kb 0s, followed by 8kb non-zero, then nr_exp_data_segs==2
*/
int nr_exp_data_segs;
/*
* expected state of data area after zeroout.
*/
struct kunit_ext_data_state exp_data_state[3];
};
static void ext_kill_sb(struct super_block *sb)
{
generic_shutdown_super(sb);
}
static int ext_set(struct super_block *sb, void *data)
{
return 0;
}
static struct file_system_type ext_fs_type = {
.name = "extents test",
.kill_sb = ext_kill_sb,
};
static void extents_kunit_exit(struct kunit *test)
{
struct super_block *sb = k_ctx.k_ei->vfs_inode.i_sb;
struct ext4_sb_info *sbi = sb->s_fs_info;
ext4_es_unregister_shrinker(sbi);
kfree(sbi);
kfree(k_ctx.k_ei);
kfree(k_ctx.k_data);
}
static int __ext4_ext_dirty_stub(const char *where, unsigned int line,
handle_t *handle, struct inode *inode,
struct ext4_ext_path *path)
{
return 0;
}
static struct ext4_ext_path *
ext4_ext_insert_extent_stub(handle_t *handle, struct inode *inode,
struct ext4_ext_path *path,
struct ext4_extent *newext, int gb_flags)
{
return ERR_PTR(-ENOSPC);
}
/*
* We will zeroout the equivalent range in the data area
*/
static int ext4_ext_zeroout_stub(struct inode *inode, struct ext4_extent *ex)
{
ext4_lblk_t ee_block, off_blk;
loff_t ee_len;
loff_t off_bytes;
struct kunit *test = kunit_get_current_test();
ee_block = le32_to_cpu(ex->ee_block);
ee_len = ext4_ext_get_actual_len(ex);
KUNIT_EXPECT_EQ_MSG(test, 1, ee_block >= EXT_DATA_LBLK, "ee_block=%d",
ee_block);
KUNIT_EXPECT_EQ(test, 1,
ee_block + ee_len <= EXT_DATA_LBLK + EXT_DATA_LEN);
off_blk = ee_block - EXT_DATA_LBLK;
off_bytes = off_blk << inode->i_sb->s_blocksize_bits;
memset(k_ctx.k_data + off_bytes, 0,
ee_len << inode->i_sb->s_blocksize_bits);
return 0;
}
static int ext4_issue_zeroout_stub(struct inode *inode, ext4_lblk_t lblk,
ext4_fsblk_t pblk, ext4_lblk_t len)
{
ext4_lblk_t off_blk;
loff_t off_bytes;
struct kunit *test = kunit_get_current_test();
kunit_log(KERN_ALERT, test,
"%s: lblk=%u pblk=%llu len=%u", __func__, lblk, pblk, len);
KUNIT_EXPECT_EQ(test, 1, lblk >= EXT_DATA_LBLK);
KUNIT_EXPECT_EQ(test, 1, lblk + len <= EXT_DATA_LBLK + EXT_DATA_LEN);
KUNIT_EXPECT_EQ(test, 1, lblk - EXT_DATA_LBLK == pblk - EXT_DATA_PBLK);
off_blk = lblk - EXT_DATA_LBLK;
off_bytes = off_blk << inode->i_sb->s_blocksize_bits;
memset(k_ctx.k_data + off_bytes, 0,
len << inode->i_sb->s_blocksize_bits);
return 0;
}
static int extents_kunit_init(struct kunit *test)
{
struct ext4_extent_header *eh = NULL;
struct ext4_inode_info *ei;
struct inode *inode;
struct super_block *sb;
struct ext4_sb_info *sbi = NULL;
struct kunit_ext_test_param *param =
(struct kunit_ext_test_param *)(test->param_value);
int err;
sb = sget(&ext_fs_type, NULL, ext_set, 0, NULL);
if (IS_ERR(sb))
return PTR_ERR(sb);
sb->s_blocksize = 4096;
sb->s_blocksize_bits = 12;
sbi = kzalloc_obj(struct ext4_sb_info);
if (sbi == NULL)
return -ENOMEM;
sbi->s_sb = sb;
sb->s_fs_info = sbi;
if (!param || !param->disable_zeroout)
sbi->s_extent_max_zeroout_kb = 32;
/* setup the mock inode */
k_ctx.k_ei = kzalloc_obj(struct ext4_inode_info);
if (k_ctx.k_ei == NULL)
return -ENOMEM;
ei = k_ctx.k_ei;
inode = &ei->vfs_inode;
err = ext4_es_register_shrinker(sbi);
if (err)
return err;
ext4_es_init_tree(&ei->i_es_tree);
rwlock_init(&ei->i_es_lock);
INIT_LIST_HEAD(&ei->i_es_list);
ei->i_es_all_nr = 0;
ei->i_es_shk_nr = 0;
ei->i_es_shrink_lblk = 0;
ei->i_disksize = (EXT_DATA_LBLK + EXT_DATA_LEN + 10)
<< sb->s_blocksize_bits;
ei->i_flags = 0;
ext4_set_inode_flag(inode, EXT4_INODE_EXTENTS);
inode->i_sb = sb;
k_ctx.k_data = kzalloc(EXT_DATA_LEN * 4096, GFP_KERNEL);
if (k_ctx.k_data == NULL)
return -ENOMEM;
/*
* set the data area to a junk value
*/
memset(k_ctx.k_data, 'X', EXT_DATA_LEN * 4096);
/* create a tree with depth 0 */
eh = (struct ext4_extent_header *)k_ctx.k_ei->i_data;
/* Fill extent header */
eh = ext_inode_hdr(&k_ctx.k_ei->vfs_inode);
eh->eh_depth = 0;
eh->eh_entries = cpu_to_le16(1);
eh->eh_magic = EXT4_EXT_MAGIC;
eh->eh_max = cpu_to_le16(ext4_ext_space_root_idx_test(
&k_ctx.k_ei->vfs_inode, 0));
eh->eh_generation = 0;
/*
* add 1 extent in leaf node covering:
* - lblks: [EXT_DATA_LBLK, EXT_DATA_LBLK * + EXT_DATA_LEN)
* - pblks: [EXT_DATA_PBLK, EXT_DATA_PBLK + EXT_DATA_LEN)
*/
EXT_FIRST_EXTENT(eh)->ee_block = cpu_to_le32(EXT_DATA_LBLK);
EXT_FIRST_EXTENT(eh)->ee_len = cpu_to_le16(EXT_DATA_LEN);
ext4_ext_store_pblock(EXT_FIRST_EXTENT(eh), EXT_DATA_PBLK);
if (!param || param->is_unwrit_at_start)
ext4_ext_mark_unwritten(EXT_FIRST_EXTENT(eh));
ext4_es_insert_extent(inode, EXT_DATA_LBLK, EXT_DATA_LEN, EXT_DATA_PBLK,
ext4_ext_is_unwritten(EXT_FIRST_EXTENT(eh)) ?
EXTENT_STATUS_UNWRITTEN :
EXTENT_STATUS_WRITTEN,
0);
/* Add stubs */
kunit_activate_static_stub(test, __ext4_ext_dirty,
__ext4_ext_dirty_stub);
kunit_activate_static_stub(test, ext4_ext_zeroout, ext4_ext_zeroout_stub);
kunit_activate_static_stub(test, ext4_issue_zeroout,
ext4_issue_zeroout_stub);
return 0;
}
/*
* Return 1 if all bytes in the buf equal to c, else return the offset of first mismatch
*/
static int check_buffer(char *buf, int c, int size)
{
void *ret = NULL;
ret = memchr_inv(buf, c, size);
if (ret == NULL)
return 0;
kunit_log(KERN_ALERT, kunit_get_current_test(),
"# %s: wrong char found at offset %u (expected:%d got:%d)", __func__,
(u32)((char *)ret - buf), c, *((char *)ret));
return 1;
}
/*
* Simulate a map block call by first calling ext4_map_query_blocks() to
* correctly populate map flags and pblk and then call the
* ext4_map_create_blocks() to do actual split and conversion. This is easier
* than calling ext4_map_blocks() because that needs mocking a lot of unrelated
* functions.
*/
static void ext4_map_create_blocks_helper(struct kunit *test,
struct inode *inode,
struct ext4_map_blocks *map,
int flags)
{
int retval = 0;
retval = ext4_map_query_blocks(NULL, inode, map, flags);
if (retval < 0) {
KUNIT_FAIL(test,
"ext4_map_query_blocks() failed. Cannot proceed\n");
return;
}
ext4_map_create_blocks(NULL, inode, map, flags);
}
static void test_split_convert(struct kunit *test)
{
struct ext4_ext_path *path;
struct inode *inode = &k_ctx.k_ei->vfs_inode;
struct ext4_extent *ex;
struct ext4_map_blocks map;
const struct kunit_ext_test_param *param =
(const struct kunit_ext_test_param *)(test->param_value);
int blkbits = inode->i_sb->s_blocksize_bits;
if (param->is_zeroout_test)
/*
* Force zeroout by making ext4_ext_insert_extent return ENOSPC
*/
kunit_activate_static_stub(test, ext4_ext_insert_extent,
ext4_ext_insert_extent_stub);
path = ext4_find_extent(inode, EXT_DATA_LBLK, NULL, EXT4_EX_NOCACHE);
ex = path->p_ext;
KUNIT_EXPECT_EQ(test, EXT_DATA_LBLK, le32_to_cpu(ex->ee_block));
KUNIT_EXPECT_EQ(test, EXT_DATA_LEN, ext4_ext_get_actual_len(ex));
KUNIT_EXPECT_EQ(test, param->is_unwrit_at_start,
ext4_ext_is_unwritten(ex));
if (param->is_zeroout_test)
KUNIT_EXPECT_EQ(test, 0,
check_buffer(k_ctx.k_data, 'X',
EXT_DATA_LEN << blkbits));
map.m_lblk = param->split_map.m_lblk;
map.m_len = param->split_map.m_len;
switch (param->type) {
case TEST_SPLIT_CONVERT:
path = ext4_split_convert_extents_test(NULL, inode, &map,
path, param->split_flags, NULL);
break;
case TEST_CREATE_BLOCKS:
ext4_map_create_blocks_helper(test, inode, &map, param->split_flags);
break;
default:
KUNIT_FAIL(test, "param->type %d not support.", param->type);
}
path = ext4_find_extent(inode, EXT_DATA_LBLK, NULL, EXT4_EX_NOCACHE);
ex = path->p_ext;
for (int i = 0; i < param->nr_exp_ext; i++) {
struct kunit_ext_state exp_ext = param->exp_ext_state[i];
bool es_check_needed = param->type != TEST_SPLIT_CONVERT;
struct extent_status es;
int contains_ex, ex_end, es_end, es_pblk;
KUNIT_EXPECT_EQ(test, exp_ext.ex_lblk,
le32_to_cpu(ex->ee_block));
KUNIT_EXPECT_EQ(test, exp_ext.ex_len,
ext4_ext_get_actual_len(ex));
KUNIT_EXPECT_EQ(test, exp_ext.is_unwrit,
ext4_ext_is_unwritten(ex));
/*
* Confirm extent cache is in sync. Note that es cache can be
* merged even when on-disk extents are not so take that into
* account.
*
* Also, ext4_split_convert_extents() forces EXT4_EX_NOCACHE hence
* es status are ignored for that case.
*/
if (es_check_needed) {
ext4_es_lookup_extent(inode, le32_to_cpu(ex->ee_block),
NULL, &es, NULL);
ex_end = exp_ext.ex_lblk + exp_ext.ex_len;
es_end = es.es_lblk + es.es_len;
contains_ex = es.es_lblk <= exp_ext.ex_lblk &&
es_end >= ex_end;
es_pblk = ext4_es_pblock(&es) +
(exp_ext.ex_lblk - es.es_lblk);
KUNIT_EXPECT_EQ(test, contains_ex, 1);
KUNIT_EXPECT_EQ(test, ext4_ext_pblock(ex), es_pblk);
KUNIT_EXPECT_EQ(test, 1,
(exp_ext.is_unwrit &&
ext4_es_is_unwritten(&es)) ||
(!exp_ext.is_unwrit &&
ext4_es_is_written(&es)));
}
/* Only printed on failure */
kunit_log(KERN_INFO, test,
"# [extent %d] exp: lblk:%d len:%d unwrit:%d \n", i,
exp_ext.ex_lblk, exp_ext.ex_len, exp_ext.is_unwrit);
kunit_log(KERN_INFO, test,
"# [extent %d] got: lblk:%d len:%d unwrit:%d\n", i,
le32_to_cpu(ex->ee_block),
ext4_ext_get_actual_len(ex),
ext4_ext_is_unwritten(ex));
if (es_check_needed)
kunit_log(
KERN_INFO, test,
"# [extent %d] es: lblk:%d len:%d pblk:%lld type:0x%x\n",
i, es.es_lblk, es.es_len, ext4_es_pblock(&es),
ext4_es_type(&es));
kunit_log(KERN_INFO, test, "------------------\n");
ex = ex + 1;
}
if (!param->is_zeroout_test)
return;
/*
* Check that then data area has been zeroed out correctly
*/
for (int i = 0; i < param->nr_exp_data_segs; i++) {
loff_t off, len;
struct kunit_ext_data_state exp_data_seg = param->exp_data_state[i];
off = exp_data_seg.off_blk << blkbits;
len = exp_data_seg.len_blk << blkbits;
KUNIT_EXPECT_EQ_MSG(test, 0,
check_buffer(k_ctx.k_data + off,
exp_data_seg.exp_char, len),
"# corruption in byte range [%lld, %lld)",
off, len);
}
return;
}
static const struct kunit_ext_test_param test_split_convert_params[] = {
/* unwrit to writ splits */
{ .desc = "split unwrit extent to 2 extents and convert 1st half writ",
.type = TEST_SPLIT_CONVERT,
.is_unwrit_at_start = 1,
.split_flags = EXT4_GET_BLOCKS_CONVERT,
.split_map = { .m_lblk = EXT_DATA_LBLK, .m_len = 1 },
.nr_exp_ext = 2,
.exp_ext_state = { { .ex_lblk = EXT_DATA_LBLK,
.ex_len = 1,
.is_unwrit = 0 },
{ .ex_lblk = EXT_DATA_LBLK + 1,
.ex_len = EXT_DATA_LEN - 1,
.is_unwrit = 1 } },
.is_zeroout_test = 0 },
{ .desc = "split unwrit extent to 2 extents and convert 2nd half writ",
.type = TEST_SPLIT_CONVERT,
.is_unwrit_at_start = 1,
.split_flags = EXT4_GET_BLOCKS_CONVERT,
.split_map = { .m_lblk = EXT_DATA_LBLK + 1, .m_len = EXT_DATA_LEN - 1 },
.nr_exp_ext = 2,
.exp_ext_state = { { .ex_lblk = EXT_DATA_LBLK,
.ex_len = 1,
.is_unwrit = 1 },
{ .ex_lblk = EXT_DATA_LBLK + 1,
.ex_len = EXT_DATA_LEN - 1,
.is_unwrit = 0 } },
.is_zeroout_test = 0 },
{ .desc = "split unwrit extent to 3 extents and convert 2nd half to writ",
.type = TEST_SPLIT_CONVERT,
.is_unwrit_at_start = 1,
.split_flags = EXT4_GET_BLOCKS_CONVERT,
.split_map = { .m_lblk = EXT_DATA_LBLK + 1, .m_len = EXT_DATA_LEN - 2 },
.nr_exp_ext = 3,
.exp_ext_state = { { .ex_lblk = EXT_DATA_LBLK,
.ex_len = 1,
.is_unwrit = 1 },
{ .ex_lblk = EXT_DATA_LBLK + 1,
.ex_len = EXT_DATA_LEN - 2,
.is_unwrit = 0 },
{ .ex_lblk = EXT_DATA_LBLK + 1 + (EXT_DATA_LEN - 2),
.ex_len = 1,
.is_unwrit = 1 } },
.is_zeroout_test = 0 },
/* writ to unwrit splits */
{ .desc = "split writ extent to 2 extents and convert 1st half unwrit",
.type = TEST_SPLIT_CONVERT,
.is_unwrit_at_start = 0,
.split_flags = EXT4_GET_BLOCKS_CONVERT_UNWRITTEN,
.split_map = { .m_lblk = EXT_DATA_LBLK, .m_len = 1 },
.nr_exp_ext = 2,
.exp_ext_state = { { .ex_lblk = EXT_DATA_LBLK,
.ex_len = 1,
.is_unwrit = 1 },
{ .ex_lblk = EXT_DATA_LBLK + 1,
.ex_len = EXT_DATA_LEN - 1,
.is_unwrit = 0 } },
.is_zeroout_test = 0 },
{ .desc = "split writ extent to 2 extents and convert 2nd half unwrit",
.type = TEST_SPLIT_CONVERT,
.is_unwrit_at_start = 0,
.split_flags = EXT4_GET_BLOCKS_CONVERT_UNWRITTEN,
.split_map = { .m_lblk = EXT_DATA_LBLK + 1, .m_len = EXT_DATA_LEN - 1 },
.nr_exp_ext = 2,
.exp_ext_state = { { .ex_lblk = EXT_DATA_LBLK,
.ex_len = 1,
.is_unwrit = 0 },
{ .ex_lblk = EXT_DATA_LBLK + 1,
.ex_len = EXT_DATA_LEN - 1,
.is_unwrit = 1 } },
.is_zeroout_test = 0 },
{ .desc = "split writ extent to 3 extents and convert 2nd half to unwrit",
.type = TEST_SPLIT_CONVERT,
.is_unwrit_at_start = 0,
.split_flags = EXT4_GET_BLOCKS_CONVERT_UNWRITTEN,
.split_map = { .m_lblk = EXT_DATA_LBLK + 1, .m_len = EXT_DATA_LEN - 2 },
.nr_exp_ext = 3,
.exp_ext_state = { { .ex_lblk = EXT_DATA_LBLK,
.ex_len = 1,
.is_unwrit = 0 },
{ .ex_lblk = EXT_DATA_LBLK + 1,
.ex_len = EXT_DATA_LEN - 2,
.is_unwrit = 1 },
{ .ex_lblk = EXT_DATA_LBLK + 1 + (EXT_DATA_LEN - 2),
.ex_len = 1,
.is_unwrit = 0 } },
.is_zeroout_test = 0 },
/*
* ***** zeroout tests *****
*/
/* unwrit to writ splits */
{ .desc = "split unwrit extent to 2 extents and convert 1st half writ (zeroout)",
.type = TEST_SPLIT_CONVERT,
.is_unwrit_at_start = 1,
.split_flags = EXT4_GET_BLOCKS_CONVERT,
.split_map = { .m_lblk = EXT_DATA_LBLK, .m_len = 1 },
.nr_exp_ext = 1,
.exp_ext_state = { { .ex_lblk = EXT_DATA_LBLK,
.ex_len = EXT_DATA_LEN,
.is_unwrit = 0 } },
.is_zeroout_test = 1,
.nr_exp_data_segs = 2,
.exp_data_state = { { .exp_char = 'X', .off_blk = 0, .len_blk = 1 },
{ .exp_char = 0,
.off_blk = 1,
.len_blk = EXT_DATA_LEN - 1 } } },
{ .desc = "split unwrit extent to 2 extents and convert 2nd half writ (zeroout)",
.type = TEST_SPLIT_CONVERT,
.is_unwrit_at_start = 1,
.split_flags = EXT4_GET_BLOCKS_CONVERT,
.split_map = { .m_lblk = EXT_DATA_LBLK + 1, .m_len = EXT_DATA_LEN - 1 },
.nr_exp_ext = 1,
.exp_ext_state = { { .ex_lblk = EXT_DATA_LBLK,
.ex_len = EXT_DATA_LEN,
.is_unwrit = 0 } },
.is_zeroout_test = 1,
.nr_exp_data_segs = 2,
.exp_data_state = { { .exp_char = 0, .off_blk = 0, .len_blk = 1 },
{ .exp_char = 'X',
.off_blk = 1,
.len_blk = EXT_DATA_LEN - 1 } } },
{ .desc = "split unwrit extent to 3 extents and convert 2nd half writ (zeroout)",
.type = TEST_SPLIT_CONVERT,
.is_unwrit_at_start = 1,
.split_flags = EXT4_GET_BLOCKS_CONVERT,
.split_map = { .m_lblk = EXT_DATA_LBLK + 1, .m_len = EXT_DATA_LEN - 2 },
.nr_exp_ext = 1,
.exp_ext_state = { { .ex_lblk = EXT_DATA_LBLK,
.ex_len = EXT_DATA_LEN,
.is_unwrit = 0 } },
.is_zeroout_test = 1,
.nr_exp_data_segs = 3,
.exp_data_state = { { .exp_char = 0, .off_blk = 0, .len_blk = 1 },
{ .exp_char = 'X', .off_blk = 1, .len_blk = EXT_DATA_LEN - 2 },
{ .exp_char = 0, .off_blk = EXT_DATA_LEN - 1, .len_blk = 1 } } },
/* writ to unwrit splits */
{ .desc = "split writ extent to 2 extents and convert 1st half unwrit (zeroout)",
.type = TEST_SPLIT_CONVERT,
.is_unwrit_at_start = 0,
.split_flags = EXT4_GET_BLOCKS_CONVERT_UNWRITTEN,
.split_map = { .m_lblk = EXT_DATA_LBLK, .m_len = 1 },
.nr_exp_ext = 1,
.exp_ext_state = { { .ex_lblk = EXT_DATA_LBLK,
.ex_len = EXT_DATA_LEN,
.is_unwrit = 0 } },
.is_zeroout_test = 1,
.nr_exp_data_segs = 2,
.exp_data_state = { { .exp_char = 0, .off_blk = 0, .len_blk = 1 },
{ .exp_char = 'X',
.off_blk = 1,
.len_blk = EXT_DATA_LEN - 1 } } },
{ .desc = "split writ extent to 2 extents and convert 2nd half unwrit (zeroout)",
.type = TEST_SPLIT_CONVERT,
.is_unwrit_at_start = 0,
.split_flags = EXT4_GET_BLOCKS_CONVERT_UNWRITTEN,
.split_map = { .m_lblk = EXT_DATA_LBLK + 1, .m_len = EXT_DATA_LEN - 1 },
.nr_exp_ext = 1,
.exp_ext_state = { { .ex_lblk = EXT_DATA_LBLK,
.ex_len = EXT_DATA_LEN,
.is_unwrit = 0 } },
.is_zeroout_test = 1,
.nr_exp_data_segs = 2,
.exp_data_state = { { .exp_char = 'X', .off_blk = 0, .len_blk = 1 },
{ .exp_char = 0,
.off_blk = 1,
.len_blk = EXT_DATA_LEN - 1 } } },
{ .desc = "split writ extent to 3 extents and convert 2nd half unwrit (zeroout)",
.type = TEST_SPLIT_CONVERT,
.is_unwrit_at_start = 0,
.split_flags = EXT4_GET_BLOCKS_CONVERT_UNWRITTEN,
.split_map = { .m_lblk = EXT_DATA_LBLK + 1, .m_len = EXT_DATA_LEN - 2 },
.nr_exp_ext = 1,
.exp_ext_state = { { .ex_lblk = EXT_DATA_LBLK,
.ex_len = EXT_DATA_LEN,
.is_unwrit = 0 } },
.is_zeroout_test = 1,
.nr_exp_data_segs = 3,
.exp_data_state = { { .exp_char = 'X', .off_blk = 0, .len_blk = 1 },
{ .exp_char = 0,
.off_blk = 1,
.len_blk = EXT_DATA_LEN - 2 },
{ .exp_char = 'X',
.off_blk = EXT_DATA_LEN - 1,
.len_blk = 1 } } },
};
/* Tests to trigger ext4_ext_map_blocks() -> convert_initialized_extent() */
static const struct kunit_ext_test_param test_convert_initialized_params[] = {
/* writ to unwrit splits */
{ .desc = "split writ extent to 2 extents and convert 1st half unwrit",
.type = TEST_CREATE_BLOCKS,
.split_flags = EXT4_GET_BLOCKS_CONVERT_UNWRITTEN,
.is_unwrit_at_start = 0,
.split_map = { .m_lblk = EXT_DATA_LBLK, .m_len = 1 },
.nr_exp_ext = 2,
.exp_ext_state = { { .ex_lblk = EXT_DATA_LBLK,
.ex_len = 1,
.is_unwrit = 1 },
{ .ex_lblk = EXT_DATA_LBLK + 1,
.ex_len = EXT_DATA_LEN - 1,
.is_unwrit = 0 } },
.is_zeroout_test = 0 },
{ .desc = "split writ extent to 2 extents and convert 2nd half unwrit",
.type = TEST_CREATE_BLOCKS,
.split_flags = EXT4_GET_BLOCKS_CONVERT_UNWRITTEN,
.is_unwrit_at_start = 0,
.split_map = { .m_lblk = EXT_DATA_LBLK + 1, .m_len = EXT_DATA_LEN - 1 },
.nr_exp_ext = 2,
.exp_ext_state = { { .ex_lblk = EXT_DATA_LBLK,
.ex_len = 1,
.is_unwrit = 0 },
{ .ex_lblk = EXT_DATA_LBLK + 1,
.ex_len = EXT_DATA_LEN - 1,
.is_unwrit = 1 } },
.is_zeroout_test = 0 },
{ .desc = "split writ extent to 3 extents and convert 2nd half to unwrit",
.type = TEST_CREATE_BLOCKS,
.split_flags = EXT4_GET_BLOCKS_CONVERT_UNWRITTEN,
.is_unwrit_at_start = 0,
.split_map = { .m_lblk = EXT_DATA_LBLK + 1, .m_len = EXT_DATA_LEN - 2 },
.nr_exp_ext = 3,
.exp_ext_state = { { .ex_lblk = EXT_DATA_LBLK,
.ex_len = 1,
.is_unwrit = 0 },
{ .ex_lblk = EXT_DATA_LBLK + 1,
.ex_len = EXT_DATA_LEN - 2,
.is_unwrit = 1 },
{ .ex_lblk = EXT_DATA_LBLK + 1 + (EXT_DATA_LEN - 2),
.ex_len = 1,
.is_unwrit = 0 } },
.is_zeroout_test = 0 },
/* writ to unwrit splits (zeroout) */
{ .desc = "split writ extent to 2 extents and convert 1st half unwrit (zeroout)",
.type = TEST_CREATE_BLOCKS,
.is_unwrit_at_start = 0,
.split_flags = EXT4_GET_BLOCKS_CONVERT_UNWRITTEN,
.split_map = { .m_lblk = EXT_DATA_LBLK, .m_len = 1 },
.nr_exp_ext = 1,
.exp_ext_state = { { .ex_lblk = EXT_DATA_LBLK,
.ex_len = EXT_DATA_LEN,
.is_unwrit = 0 } },
.is_zeroout_test = 1,
.nr_exp_data_segs = 2,
.exp_data_state = { { .exp_char = 0, .off_blk = 0, .len_blk = 1 },
{ .exp_char = 'X',
.off_blk = 1,
.len_blk = EXT_DATA_LEN - 1 } } },
{ .desc = "split writ extent to 2 extents and convert 2nd half unwrit (zeroout)",
.type = TEST_CREATE_BLOCKS,
.is_unwrit_at_start = 0,
.split_flags = EXT4_GET_BLOCKS_CONVERT_UNWRITTEN,
.split_map = { .m_lblk = EXT_DATA_LBLK + 1, .m_len = EXT_DATA_LEN - 1 },
.nr_exp_ext = 1,
.exp_ext_state = { { .ex_lblk = EXT_DATA_LBLK,
.ex_len = EXT_DATA_LEN,
.is_unwrit = 0 } },
.is_zeroout_test = 1,
.nr_exp_data_segs = 2,
.exp_data_state = { { .exp_char = 'X', .off_blk = 0, .len_blk = 1 },
{ .exp_char = 0,
.off_blk = 1,
.len_blk = EXT_DATA_LEN - 1 } } },
{ .desc = "split writ extent to 3 extents and convert 2nd half unwrit (zeroout)",
.type = TEST_CREATE_BLOCKS,
.is_unwrit_at_start = 0,
.split_flags = EXT4_GET_BLOCKS_CONVERT_UNWRITTEN,
.split_map = { .m_lblk = EXT_DATA_LBLK + 1, .m_len = EXT_DATA_LEN - 2 },
.nr_exp_ext = 1,
.exp_ext_state = { { .ex_lblk = EXT_DATA_LBLK,
.ex_len = EXT_DATA_LEN,
.is_unwrit = 0 } },
.is_zeroout_test = 1,
.nr_exp_data_segs = 3,
.exp_data_state = { { .exp_char = 'X', .off_blk = 0, .len_blk = 1 },
{ .exp_char = 0,
.off_blk = 1,
.len_blk = EXT_DATA_LEN - 2 },
{ .exp_char = 'X',
.off_blk = EXT_DATA_LEN - 1,
.len_blk = 1 } } },
};
/* Tests to trigger ext4_ext_map_blocks() -> ext4_ext_handle_unwritten_exntents() */
static const struct kunit_ext_test_param test_handle_unwritten_params[] = {
/* unwrit to writ splits via endio path */
{ .desc = "split unwrit extent to 2 extents and convert 1st half writ (endio)",
.type = TEST_CREATE_BLOCKS,
.is_unwrit_at_start = 1,
.split_flags = EXT4_GET_BLOCKS_CONVERT,
.split_map = { .m_lblk = EXT_DATA_LBLK, .m_len = 1 },
.nr_exp_ext = 2,
.exp_ext_state = { { .ex_lblk = EXT_DATA_LBLK,
.ex_len = 1,
.is_unwrit = 0 },
{ .ex_lblk = EXT_DATA_LBLK + 1,
.ex_len = EXT_DATA_LEN - 1,
.is_unwrit = 1 } },
.is_zeroout_test = 0 },
{ .desc = "split unwrit extent to 2 extents and convert 2nd half writ (endio)",
.type = TEST_CREATE_BLOCKS,
.is_unwrit_at_start = 1,
.split_flags = EXT4_GET_BLOCKS_CONVERT,
.split_map = { .m_lblk = EXT_DATA_LBLK + 1, .m_len = EXT_DATA_LEN - 1 },
.nr_exp_ext = 2,
.exp_ext_state = { { .ex_lblk = EXT_DATA_LBLK,
.ex_len = 1,
.is_unwrit = 1 },
{ .ex_lblk = EXT_DATA_LBLK + 1,
.ex_len = EXT_DATA_LEN - 1,
.is_unwrit = 0 } },
.is_zeroout_test = 0 },
{ .desc = "split unwrit extent to 3 extents and convert 2nd half to writ (endio)",
.type = TEST_CREATE_BLOCKS,
.is_unwrit_at_start = 1,
.split_flags = EXT4_GET_BLOCKS_CONVERT,
.split_map = { .m_lblk = EXT_DATA_LBLK + 1, .m_len = EXT_DATA_LEN - 2 },
.nr_exp_ext = 3,
.exp_ext_state = { { .ex_lblk = EXT_DATA_LBLK,
.ex_len = 1,
.is_unwrit = 1 },
{ .ex_lblk = EXT_DATA_LBLK + 1,
.ex_len = EXT_DATA_LEN - 2,
.is_unwrit = 0 },
{ .ex_lblk = EXT_DATA_LBLK + 1 + (EXT_DATA_LEN - 2),
.ex_len = 1,
.is_unwrit = 1 } },
.is_zeroout_test = 0 },
/* unwrit to writ splits via non-endio path */
{ .desc = "split unwrit extent to 2 extents and convert 1st half writ (non endio)",
.type = TEST_CREATE_BLOCKS,
.is_unwrit_at_start = 1,
.split_flags = EXT4_GET_BLOCKS_CREATE,
.split_map = { .m_lblk = EXT_DATA_LBLK, .m_len = 1 },
.nr_exp_ext = 2,
.disable_zeroout = true,
.exp_ext_state = { { .ex_lblk = EXT_DATA_LBLK,
.ex_len = 1,
.is_unwrit = 0 },
{ .ex_lblk = EXT_DATA_LBLK + 1,
.ex_len = EXT_DATA_LEN - 1,
.is_unwrit = 1 } },
.is_zeroout_test = 0 },
{ .desc = "split unwrit extent to 2 extents and convert 2nd half writ (non endio)",
.type = TEST_CREATE_BLOCKS,
.is_unwrit_at_start = 1,
.split_flags = EXT4_GET_BLOCKS_CREATE,
.split_map = { .m_lblk = EXT_DATA_LBLK + 1, .m_len = EXT_DATA_LEN - 1 },
.nr_exp_ext = 2,
.disable_zeroout = true,
.exp_ext_state = { { .ex_lblk = EXT_DATA_LBLK,
.ex_len = 1,
.is_unwrit = 1 },
{ .ex_lblk = EXT_DATA_LBLK + 1,
.ex_len = EXT_DATA_LEN - 1,
.is_unwrit = 0 } },
.is_zeroout_test = 0 },
{ .desc = "split unwrit extent to 3 extents and convert 2nd half to writ (non endio)",
.type = TEST_CREATE_BLOCKS,
.is_unwrit_at_start = 1,
.split_flags = EXT4_GET_BLOCKS_CREATE,
.split_map = { .m_lblk = EXT_DATA_LBLK + 1, .m_len = EXT_DATA_LEN - 2 },
.nr_exp_ext = 3,
.disable_zeroout = true,
.exp_ext_state = { { .ex_lblk = EXT_DATA_LBLK,
.ex_len = 1,
.is_unwrit = 1 },
{ .ex_lblk = EXT_DATA_LBLK + 1,
.ex_len = EXT_DATA_LEN - 2,
.is_unwrit = 0 },
{ .ex_lblk = EXT_DATA_LBLK + 1 + (EXT_DATA_LEN - 2),
.ex_len = 1,
.is_unwrit = 1 } },
.is_zeroout_test = 0 },
/*
* ***** zeroout tests *****
*/
/* unwrit to writ splits (endio)*/
{ .desc = "split unwrit extent to 2 extents and convert 1st half writ (endio, zeroout)",
.type = TEST_CREATE_BLOCKS,
.is_unwrit_at_start = 1,
.split_flags = EXT4_GET_BLOCKS_CONVERT,
.split_map = { .m_lblk = EXT_DATA_LBLK, .m_len = 1 },
.nr_exp_ext = 1,
.exp_ext_state = { { .ex_lblk = EXT_DATA_LBLK,
.ex_len = EXT_DATA_LEN,
.is_unwrit = 0 } },
.is_zeroout_test = 1,
.nr_exp_data_segs = 2,
.exp_data_state = { { .exp_char = 'X', .off_blk = 0, .len_blk = 1 },
{ .exp_char = 0,
.off_blk = 1,
.len_blk = EXT_DATA_LEN - 1 } } },
{ .desc = "split unwrit extent to 2 extents and convert 2nd half writ (endio, zeroout)",
.type = TEST_CREATE_BLOCKS,
.is_unwrit_at_start = 1,
.split_flags = EXT4_GET_BLOCKS_CONVERT,
.split_map = { .m_lblk = EXT_DATA_LBLK + 1, .m_len = EXT_DATA_LEN - 1 },
.nr_exp_ext = 1,
.exp_ext_state = { { .ex_lblk = EXT_DATA_LBLK,
.ex_len = EXT_DATA_LEN,
.is_unwrit = 0 } },
.is_zeroout_test = 1,
.nr_exp_data_segs = 2,
.exp_data_state = { { .exp_char = 0, .off_blk = 0, .len_blk = 1 },
{ .exp_char = 'X',
.off_blk = 1,
.len_blk = EXT_DATA_LEN - 1 } } },
{ .desc = "split unwrit extent to 3 extents and convert 2nd half writ (endio, zeroout)",
.type = TEST_CREATE_BLOCKS,
.is_unwrit_at_start = 1,
.split_flags = EXT4_GET_BLOCKS_CONVERT,
.split_map = { .m_lblk = EXT_DATA_LBLK + 1, .m_len = EXT_DATA_LEN - 2 },
.nr_exp_ext = 1,
.exp_ext_state = { { .ex_lblk = EXT_DATA_LBLK,
.ex_len = EXT_DATA_LEN,
.is_unwrit = 0 } },
.is_zeroout_test = 1,
.nr_exp_data_segs = 3,
.exp_data_state = { { .exp_char = 0, .off_blk = 0, .len_blk = 1 },
{ .exp_char = 'X',
.off_blk = 1,
.len_blk = EXT_DATA_LEN - 2 },
{ .exp_char = 0,
.off_blk = EXT_DATA_LEN - 1,
.len_blk = 1 } } },
/* unwrit to writ splits (non-endio)*/
{ .desc = "split unwrit extent to 2 extents and convert 1st half writ (non-endio, zeroout)",
.type = TEST_CREATE_BLOCKS,
.is_unwrit_at_start = 1,
.split_flags = EXT4_GET_BLOCKS_CREATE,
.split_map = { .m_lblk = EXT_DATA_LBLK, .m_len = 1 },
.nr_exp_ext = 1,
.exp_ext_state = { { .ex_lblk = EXT_DATA_LBLK,
.ex_len = EXT_DATA_LEN,
.is_unwrit = 0 } },
.is_zeroout_test = 1,
.nr_exp_data_segs = 2,
.exp_data_state = { { .exp_char = 'X', .off_blk = 0, .len_blk = 1 },
{ .exp_char = 0,
.off_blk = 1,
.len_blk = EXT_DATA_LEN - 1 } } },
{ .desc = "split unwrit extent to 2 extents and convert 2nd half writ (non-endio, zeroout)",
.type = TEST_CREATE_BLOCKS,
.is_unwrit_at_start = 1,
.split_flags = EXT4_GET_BLOCKS_CREATE,
.split_map = { .m_lblk = EXT_DATA_LBLK + 1, .m_len = EXT_DATA_LEN - 1 },
.nr_exp_ext = 1,
.exp_ext_state = { { .ex_lblk = EXT_DATA_LBLK,
.ex_len = EXT_DATA_LEN,
.is_unwrit = 0 } },
.is_zeroout_test = 1,
.nr_exp_data_segs = 2,
.exp_data_state = { { .exp_char = 0, .off_blk = 0, .len_blk = 1 },
{ .exp_char = 'X',
.off_blk = 1,
.len_blk = EXT_DATA_LEN - 1 } } },
{ .desc = "split unwrit extent to 3 extents and convert 2nd half writ (non-endio, zeroout)",
.type = TEST_CREATE_BLOCKS,
.is_unwrit_at_start = 1,
.split_flags = EXT4_GET_BLOCKS_CREATE,
.split_map = { .m_lblk = EXT_DATA_LBLK + 1, .m_len = EXT_DATA_LEN - 2 },
.nr_exp_ext = 1,
.exp_ext_state = { { .ex_lblk = EXT_DATA_LBLK,
.ex_len = EXT_DATA_LEN,
.is_unwrit = 0 } },
.is_zeroout_test = 1,
.nr_exp_data_segs = 3,
.exp_data_state = { { .exp_char = 0, .off_blk = 0, .len_blk = 1 },
{ .exp_char = 'X',
.off_blk = 1,
.len_blk = EXT_DATA_LEN - 2 },
{ .exp_char = 0,
.off_blk = EXT_DATA_LEN - 1,
.len_blk = 1 } } },
};
static void ext_get_desc(struct kunit *test, const void *p, char *desc)
{
struct kunit_ext_test_param *param = (struct kunit_ext_test_param *)p;
snprintf(desc, KUNIT_PARAM_DESC_SIZE, "%s %s\n", param->desc,
(param->type & TEST_CREATE_BLOCKS) ? "(highlevel)" : "");
}
static int test_split_convert_param_init(struct kunit *test)
{
size_t arr_size = ARRAY_SIZE(test_split_convert_params);
kunit_register_params_array(test, test_split_convert_params, arr_size,
ext_get_desc);
return 0;
}
static int test_convert_initialized_param_init(struct kunit *test)
{
size_t arr_size = ARRAY_SIZE(test_convert_initialized_params);
kunit_register_params_array(test, test_convert_initialized_params,
arr_size, ext_get_desc);
return 0;
}
static int test_handle_unwritten_init(struct kunit *test)
{
size_t arr_size = ARRAY_SIZE(test_handle_unwritten_params);
kunit_register_params_array(test, test_handle_unwritten_params,
arr_size, ext_get_desc);
return 0;
}
/*
* Note that we use KUNIT_CASE_PARAM_WITH_INIT() instead of the more compact
* KUNIT_ARRAY_PARAM() because the later currently has a limitation causing the
* output parsing to be prone to error. For more context:
*
* https://lore.kernel.org/linux-kselftest/aULJpTvJDw9ctUDe@li-dc0c254c-257c-11b2-a85c-98b6c1322444.ibm.com/
*/
static struct kunit_case extents_test_cases[] = {
KUNIT_CASE_PARAM_WITH_INIT(test_split_convert, kunit_array_gen_params,
test_split_convert_param_init, NULL),
KUNIT_CASE_PARAM_WITH_INIT(test_split_convert, kunit_array_gen_params,
test_convert_initialized_param_init, NULL),
KUNIT_CASE_PARAM_WITH_INIT(test_split_convert, kunit_array_gen_params,
test_handle_unwritten_init, NULL),
{}
};
static struct kunit_suite extents_test_suite = {
.name = "ext4_extents_test",
.init = extents_kunit_init,
.exit = extents_kunit_exit,
.test_cases = extents_test_cases,
};
kunit_test_suites(&extents_test_suite);
MODULE_LICENSE("GPL");
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