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ext4: convert mballoc KUnit test to sget_fc()

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Same treatment as the extents KUnit test. The mballoc test uses sget()
as a thin "give me an initialized superblock" wrapper for a fake
file_system_type. Move it onto sget_fc() so sget() can go away.

Add a no-op mbt_init_fs_context() so fs_context_for_mount() has
something to call on the fake fs_type. mbt_set() now takes a struct
fs_context * (still a no-op). mbt_ext4_alloc_super_block() allocates
the fc, hands it to sget_fc() and drops the fc reference once the sb
is published.

No functional change.

Link: https://patch.msgid.link/20260529-work-sget-v2-2-57bbe08604e4@kernel.org
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>
This commit is contained in:
Christian Brauner 2026-05-29 10:43:41 +02:00
parent badb2cc8cf
commit ed56dc8bbf
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GPG Key ID: 91C61BC06578DCA2
1 changed files with 15 additions and 2 deletions
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17
fs/ext4/mballoc-test.c
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@ -5,6 +5,7 @@
#include <kunit/test.h>
#include <kunit/static_stub.h>
#include <linux/fs_context.h>
#include <linux/random.h>
#include "ext4.h"
@ -63,8 +64,14 @@ static void mbt_kill_sb(struct super_block *sb)
generic_shutdown_super(sb);
}
static int mbt_init_fs_context(struct fs_context *fc)
{
return 0;
}
static struct file_system_type mbt_fs_type = {
.name = "mballoc test",
.init_fs_context = mbt_init_fs_context,
.kill_sb = mbt_kill_sb,
};
@ -127,7 +134,7 @@ static void mbt_mb_release(struct super_block *sb)
kfree(sb->s_bdev);
}
static int mbt_set(struct super_block *sb, void *data)
static int mbt_set(struct super_block *sb, struct fs_context *fc)
{
return 0;
}
@ -136,13 +143,19 @@ static struct super_block *mbt_ext4_alloc_super_block(void)
{
struct mbt_ext4_super_block *fsb;
struct super_block *sb;
struct fs_context *fc;
struct ext4_sb_info *sbi;
fsb = kzalloc_obj(*fsb);
if (fsb == NULL)
return NULL;
sb = sget(&mbt_fs_type, NULL, mbt_set, 0, NULL);
fc = fs_context_for_mount(&mbt_fs_type, 0);
if (IS_ERR(fc))
goto out;
sb = sget_fc(fc, NULL, mbt_set);
put_fs_context(fc);
if (IS_ERR(sb))
goto out;