ext4: convert extents KUnit test to sget_fc()

The extents KUnit test uses sget() to get an initialized superblock for
its fake file_system_type. sget() predates fs_context and we want to
retire it. Switch this caller over to sget_fc().

Add a no-op ext_init_fs_context() so fs_context_for_mount() has
something to call on the fake fs_type. ext_set() now takes a struct
fs_context * (still a no-op). extents_kunit_init() allocates the fc,
hands it to sget_fc() and drops the fc reference once the sb is
published. sget_fc() does not retain a pointer to it.

No functional change for the test.

Link: https://patch.msgid.link/20260529-work-sget-v2-1-57bbe08604e4@kernel.org
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>

diff --git a/fs/ext4/extents-test.c b/fs/ext4/extents-test.c
index 6b53a3f39fcd69519d43753a8e92677cba7599e7..bd7795a82607d1b68e10cec393f95c6eb88d1146 100644 (file)
--- a/fs/ext4/extents-test.c
+++ b/fs/ext4/extents-test.c
@@ -37,6 +37,7 @@
 
 #include <kunit/test.h>
 #include <kunit/static_stub.h>
+#include <linux/fs_context.h>
 #include <linux/gfp_types.h>
 #include <linux/stddef.h>
 
@@ -130,14 +131,20 @@ static void ext_kill_sb(struct super_block *sb)
        generic_shutdown_super(sb);
 }
 
-static int ext_set(struct super_block *sb, void *data)
+static int ext_init_fs_context(struct fs_context *fc)
+{
+       return 0;
+}
+
+static int ext_set(struct super_block *sb, struct fs_context *fc)
 {
        return 0;
 }
 
 static struct file_system_type ext_fs_type = {
-       .name = "extents test",
-       .kill_sb = ext_kill_sb,
+       .name            = "extents test",
+       .init_fs_context = ext_init_fs_context,
+       .kill_sb         = ext_kill_sb,
 };
 
 static void extents_kunit_exit(struct kunit *test)
@@ -223,6 +230,7 @@ static int extents_kunit_init(struct kunit *test)
        struct ext4_inode_info *ei;
        struct inode *inode;
        struct super_block *sb;
+       struct fs_context *fc;
        struct ext4_sb_info *sbi = NULL;
        struct kunit_ext_test_param *param =
                (struct kunit_ext_test_param *)(test->param_value);
@@ -232,7 +240,13 @@ static int extents_kunit_init(struct kunit *test)
        if (sbi == NULL)
                return -ENOMEM;
 
-       sb = sget(&ext_fs_type, NULL, ext_set, 0, NULL);
+       fc = fs_context_for_mount(&ext_fs_type, 0);
+       if (IS_ERR(fc)) {
+               kfree(sbi);
+               return PTR_ERR(fc);
+       }
+       sb = sget_fc(fc, NULL, ext_set);
+       put_fs_context(fc);
        if (IS_ERR(sb)) {
                kfree(sbi);
                return PTR_ERR(sb);