【OLK-6.6】主线补丁回合 ext4: show the default enabled prefetch_block_bitmaps option

```
commit fdfa648ab9393de8c1be21cad17c17bdced3a68a
Author: Baokun Li <libaokun1@huawei.com>
Date:   Tue Oct 8 20:01:34 2024 +0800

ext4: show the default enabled prefetch_block_bitmaps option
    
    After commit 21175ca434c5 ("ext4: make prefetch_block_bitmaps default"),
    we enable 'prefetch_block_bitmaps' by default, but this is not shown in
    the '/proc/fs/ext4/sdx/options' procfs interface.
    
    This makes it impossible to distinguish whether the feature is enabled by
    default or not, so 'prefetch_block_bitmaps' is shown in the 'options'
    procfs interface when prefetch_block_bitmaps is enabled by default.
    
    This makes it easy to notice changes to the default mount options between
    versions through the '/proc/fs/ext4/sdx/options' procfs interface.
    
    Signed-off-by: Baokun Li <libaokun1@huawei.com>
    Reviewed-by: Jan Kara <jack@suse.cz>
    Link: https://patch.msgid.link/20241008120134.3758097-1-libaokun@huaweicloud.com
    Signed-off-by: Theodore Ts'o <tytso@mit.edu>

diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 8a0af97e5d90..e7d3c2e209ba 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -3030,6 +3030,9 @@ static int _ext4_show_options(struct seq_file *seq, struct super_block *sb,
                SEQ_OPTS_PUTS("mb_optimize_scan=1");
        }
 
+       if (nodefs && !test_opt(sb, NO_PREFETCH_BLOCK_BITMAPS))
+               SEQ_OPTS_PUTS("prefetch_block_bitmaps");
+
        ext4_show_quota_options(seq, sb);
        return 0;
 }
```

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