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ext4: alloc test super block from sget

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This fix the oops in ext4 unit test which is cuased by NULL sb.s_user_ns
as following:
<4>[ 14.344565] map_id_range_down (kernel/user_namespace.c:318)
<4>[ 14.345378] make_kuid (kernel/user_namespace.c:415)
<4>[ 14.345998] inode_init_always (include/linux/fs.h:1375 fs/inode.c:174)
<4>[ 14.346696] alloc_inode (fs/inode.c:268)
<4>[ 14.347353] new_inode_pseudo (fs/inode.c:1007)
<4>[ 14.348016] new_inode (fs/inode.c:1033)
<4>[ 14.348644] ext4_mb_init (fs/ext4/mballoc.c:3404 fs/ext4/mballoc.c:3719)
<4>[ 14.349312] mbt_kunit_init (fs/ext4/mballoc-test.c:57
fs/ext4/mballoc-test.c:314)
<4>[ 14.349983] kunit_try_run_case (lib/kunit/test.c:388 lib/kunit/test.c:443)
<4>[ 14.350696] kunit_generic_run_threadfn_adapter (lib/kunit/try-catch.c:30)
<4>[ 14.351530] kthread (kernel/kthread.c:388)
<4>[ 14.352168] ret_from_fork (arch/arm64/kernel/entry.S:861)
<0>[ 14.353385] Code: 52808004 b8236ae7 72be5e44 b90004c4 (38e368a1)

Alloc test super block from sget to properly initialize test super block
to fix the issue.

Signed-off-by: Kemeng Shi <shikemeng@huaweicloud.com>
Reported-by: Linux Kernel Functional Testing <lkft@linaro.org>
Reported-by: Guenter Roeck <linux@roeck-us.net>
Tested-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/20240304163543.6700-2-shikemeng@huaweicloud.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
Kemeng Shi 2024-03-05 00:35:41 +08:00 committed by Theodore Ts'o
parent d60c53694c
commit 8ffc0cd24c
1 changed files with 39 additions and 16 deletions
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55
fs/ext4/mballoc-test.c
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@ -21,16 +21,28 @@ struct mbt_ctx {
};
struct mbt_ext4_super_block {
struct super_block sb;
struct ext4_super_block es;
struct ext4_sb_info sbi;
struct mbt_ctx mbt_ctx;
};
#define MBT_CTX(_sb) (&(container_of((_sb), struct mbt_ext4_super_block, sb)->mbt_ctx))
#define MBT_SB(_sb) (container_of((_sb)->s_fs_info, struct mbt_ext4_super_block, sbi))
#define MBT_CTX(_sb) (&MBT_SB(_sb)->mbt_ctx)
#define MBT_GRP_CTX(_sb, _group) (&MBT_CTX(_sb)->grp_ctx[_group])
static const struct super_operations mbt_sops = {
};
static void mbt_kill_sb(struct super_block *sb)
{
generic_shutdown_super(sb);
}
static struct file_system_type mbt_fs_type = {
.name = "mballoc test",
.kill_sb = mbt_kill_sb,
};
static int mbt_mb_init(struct super_block *sb)
{
int ret;
@ -72,43 +84,54 @@ static void mbt_mb_release(struct super_block *sb)
kfree(sb->s_bdev);
}
static int mbt_set(struct super_block *sb, void *data)
{
return 0;
}
static struct super_block *mbt_ext4_alloc_super_block(void)
{
struct ext4_super_block *es = kzalloc(sizeof(*es), GFP_KERNEL);
struct ext4_sb_info *sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
struct mbt_ext4_super_block *fsb = kzalloc(sizeof(*fsb), GFP_KERNEL);
struct mbt_ext4_super_block *fsb;
struct super_block *sb;
struct ext4_sb_info *sbi;
if (fsb == NULL || sbi == NULL || es == NULL)
fsb = kzalloc(sizeof(*fsb), GFP_KERNEL);
if (fsb == NULL)
return NULL;
sb = sget(&mbt_fs_type, NULL, mbt_set, 0, NULL);
if (IS_ERR(sb))
goto out;
sbi = &fsb->sbi;
sbi->s_blockgroup_lock =
kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
if (!sbi->s_blockgroup_lock)
goto out;
goto out_deactivate;
bgl_lock_init(sbi->s_blockgroup_lock);
sbi->s_es = es;
fsb->sb.s_fs_info = sbi;
sbi->s_es = &fsb->es;
sb->s_fs_info = sbi;
return &fsb->sb;
up_write(&sb->s_umount);
return sb;
out_deactivate:
deactivate_locked_super(sb);
out:
kfree(fsb);
kfree(sbi);
kfree(es);
return NULL;
}
static void mbt_ext4_free_super_block(struct super_block *sb)
{
struct mbt_ext4_super_block *fsb =
container_of(sb, struct mbt_ext4_super_block, sb);
struct mbt_ext4_super_block *fsb = MBT_SB(sb);
struct ext4_sb_info *sbi = EXT4_SB(sb);
kfree(sbi->s_blockgroup_lock);
kfree(sbi->s_es);
kfree(sbi);
deactivate_super(sb);
kfree(fsb);
}