linux-kernel - RE: [f2fs-dev] [PATCH 0/2] f2fs: remove debufs dir if debugfs_create

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Date:	Tue, 03 Dec 2013 13:49:05 +0800
From:	Chao Yu <chao2.yu@...sung.com>
To:	liuyiyang@...ense.com
Cc:	'fs-devel' <linux-fsdevel@...r.kernel.org>,
	'kernel' <linux-kernel@...r.kernel.org>,
	'f2fs' <linux-f2fs-devel@...ts.sourceforge.net>,
	'Jaegeuk Kim' <jaegeuk.kim@...sung.com>,
	谭姝 <shu.tan@...sung.com>
Subject: RE: [f2fs-dev] [PATCH 0/2] f2fs: remove debufs dir if
 debugfs_create_file() failed

Hi Liu,

You're right, we should release it instead of holding the resource
with no use. And here are some comments as following.

BTW, your patch is out of format. You'd better not let remote
terminal or editor to instead tab with blanks in the patch.

Thanks,
Yu

> -----Original Message-----
> From: Younger Liu [mailto:younger.liucn@...il.com]
> Sent: Monday, December 02, 2013 9:16 PM
> To: Jaegeuk Kim
> Cc: fs-devel; kernel; f2fs
> Subject: [f2fs-dev] [PATCH 0/2] f2fs: remove debufs dir if debugfs_create_file() failed
> 
> From: Younger Liu <liuyiyang@...ense.com>
> 
> When debugfs_create_file() failed in f2fs_create_root_stats(),
> debugfs_root should be removed.
> 
> Signed-off-by: Younger Liu <liuyiyang@...ense.com>
> Cc: Younger Liu <younger.liucn@...il.com>
> Cc: Jaegeuk Kim <jaegeuk.kim@...sung.com>
> ---
>  fs/f2fs/debug.c |   20 +++++++++++++++++---
>  1 file changed, 17 insertions(+), 3 deletions(-)
> 
> diff --git a/fs/f2fs/debug.c b/fs/f2fs/debug.c
> index a84b0a8..d27b689 100644
> --- a/fs/f2fs/debug.c
> +++ b/fs/f2fs/debug.c
> @@ -340,10 +340,24 @@ void f2fs_destroy_stats(struct f2fs_sb_info *sbi)
> 
>  void __init f2fs_create_root_stats(void)
>  {
> +    struct dentry *file;
> +
>      debugfs_root = debugfs_create_dir("f2fs", NULL);
> -    if (debugfs_root)
> -        debugfs_create_file("status", S_IRUGO, debugfs_root,
> -                     NULL, &stat_fops);
> +    if (!debugfs_root)
> +        goto bail;
> +
> +    file = debugfs_create_file("status", S_IRUGO,
> +            debugfs_root, NULL, &stat_fops);
> +    if (!file)
> +        goto free_debugfs_dir;
> +
> +    return;
> +
> +free_debugfs_dir:
> +    debugfs_remove(debugfs_root);

debugfs_root = NULL;

> +
> +bail:
> +    return;
>  }
> 
>  void f2fs_destroy_root_stats(void)

You should judge debugfs_root value in f2fs_destroy_root_stats
to decide free or not.

> --
> 1.7.9.5
> 
> 
> 
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