linux-kernel - Re: [PATCH RFC 07/13] iomap: simplify iomap_swapfile

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Date:   Thu, 15 Jul 2021 10:11:51 -0700
From:   "Darrick J. Wong" <djwong@...nel.org>
To:     Jia He <justin.he@....com>
Cc:     linux-kernel@...r.kernel.org,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Christoph Hellwig <hch@...radead.org>, nd@....com,
        linux-xfs@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH RFC 07/13] iomap: simplify iomap_swapfile_fail() with
 '%pD' specifier

On Thu, Jul 15, 2021 at 11:15:27AM +0800, Jia He wrote:
> After the behavior of '%pD' is change to print the full path of file,
> iomap_swapfile_fail() can be simplified.
> 
> Given the space with proper length would be allocated in vprintk_store(),
> the kmalloc() is not required any more.
> 
> Besides, the previous number postfix of '%pD' in format string is
> pointless.
> 
> Cc: Christoph Hellwig <hch@...radead.org>
> Cc: "Darrick J. Wong" <djwong@...nel.org>
> Cc: linux-xfs@...r.kernel.org
> Cc: linux-fsdevel@...r.kernel.org
> Cc: linux-kernel@...r.kernel.org
> Suggested-by: Christoph Hellwig <hch@...radead.org>
> Signed-off-by: Jia He <justin.he@....com>

Seems reasonable to me...
Acked-by: Darrick J. Wong <djwong@...nel.org>

--D

> ---
>  fs/iomap/direct-io.c | 2 +-
>  fs/iomap/swapfile.c  | 8 +-------
>  2 files changed, 2 insertions(+), 8 deletions(-)
> 
> diff --git a/fs/iomap/direct-io.c b/fs/iomap/direct-io.c
> index 9398b8c31323..e876a5f9d888 100644
> --- a/fs/iomap/direct-io.c
> +++ b/fs/iomap/direct-io.c
> @@ -426,7 +426,7 @@ iomap_dio_actor(struct inode *inode, loff_t pos, loff_t length,
>  		 * iomap_apply() call in the DIO path, then it will see the
>  		 * DELALLOC block that the page-mkwrite allocated.
>  		 */
> -		pr_warn_ratelimited("Direct I/O collision with buffered writes! File: %pD4 Comm: %.20s\n",
> +		pr_warn_ratelimited("Direct I/O collision with buffered writes! File: %pD Comm: %.20s\n",
>  				    dio->iocb->ki_filp, current->comm);
>  		return -EIO;
>  	default:
> diff --git a/fs/iomap/swapfile.c b/fs/iomap/swapfile.c
> index 6250ca6a1f85..17032c14e466 100644
> --- a/fs/iomap/swapfile.c
> +++ b/fs/iomap/swapfile.c
> @@ -73,13 +73,7 @@ static int iomap_swapfile_add_extent(struct iomap_swapfile_info *isi)
>  
>  static int iomap_swapfile_fail(struct iomap_swapfile_info *isi, const char *str)
>  {
> -	char *buf, *p = ERR_PTR(-ENOMEM);
> -
> -	buf = kmalloc(PATH_MAX, GFP_KERNEL);
> -	if (buf)
> -		p = file_path(isi->file, buf, PATH_MAX);
> -	pr_err("swapon: file %s %s\n", IS_ERR(p) ? "<unknown>" : p, str);
> -	kfree(buf);
> +	pr_err("swapon: file %pD %s\n", isi->file, str);
>  	return -EINVAL;
>  }
>  
> -- 
> 2.17.1
>