linux-kernel - Re: [PATCH] bcachefs: indent error messages of invalid compression

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Message-ID: <sd4nbvk24h5aiooqkzczyqfc33t7triwlsrp4neyd6wovmodak@lwvvuurcehbu>
Date: Mon, 7 Apr 2025 14:43:22 -0400
From: Kent Overstreet <kent.overstreet@...ux.dev>
To: Integral <integral@...hlinuxcn.org>
Cc: linux-bcachefs@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] bcachefs: indent error messages of invalid compression

On Tue, Apr 08, 2025 at 01:41:31AM +0800, Integral wrote:
> This patch uses printbuf_indent_add_nextline() to set a consistent
> indentation level for error messages of invalid compression.
> 
> In my previous patch [1], the newline is added by using '\n' in
> the argument of prt_str(). This patch replaces '\n' with prt_newline()
> to make indentation level work correctly.
> 
> [1] Link: https://lore.kernel.org/20250406152659.205997-2-integral@archlinuxcn.org
> 
> Signed-off-by: Integral <integral@...hlinuxcn.org>
> ---
>  fs/bcachefs/compress.c | 12 ++++++++----
>  fs/bcachefs/opts.c     |  1 +
>  2 files changed, 9 insertions(+), 4 deletions(-)
> 
> diff --git a/fs/bcachefs/compress.c b/fs/bcachefs/compress.c
> index d68c3c7896a3..a107aa88a875 100644
> --- a/fs/bcachefs/compress.c
> +++ b/fs/bcachefs/compress.c
> @@ -713,8 +713,10 @@ int bch2_opt_compression_parse(struct bch_fs *c, const char *_val, u64 *res,
>  	level_str = p;
>  
>  	ret = match_string(bch2_compression_opts, -1, type_str);
> -	if (ret < 0 && err)
> -		prt_str(err, "invalid compression type\n");
> +	if (ret < 0 && err) {
> +		prt_str(err, "invalid compression type");
> +		prt_newline(err);
> +	}
>  	if (ret < 0)
>  		goto err;
>  
> @@ -728,8 +730,10 @@ int bch2_opt_compression_parse(struct bch_fs *c, const char *_val, u64 *res,
>  			ret = -EINVAL;
>  		if (!ret && level > 15)
>  			ret = -EINVAL;
> -		if (ret < 0 && err)
> -			prt_str(err, "invalid compression level\n");
> +		if (ret < 0 && err) {
> +			prt_str(err, "invalid compression level");

You can just change this to prt_printf() or prt_str_indented(), that'll
interpret the \n correctly

> +			prt_newline(err);
> +		}
>  		if (ret < 0)
>  			goto err;
>  
> diff --git a/fs/bcachefs/opts.c b/fs/bcachefs/opts.c
> index cd7b0cd293c7..f35fde896253 100644
> --- a/fs/bcachefs/opts.c
> +++ b/fs/bcachefs/opts.c
> @@ -365,6 +365,7 @@ int bch2_opt_parse(struct bch_fs *c,
>  		   struct printbuf *err)
>  {
>  	ssize_t ret;
> +	printbuf_indent_add_nextline(err, 2);
>  
>  	switch (opt->type) {
>  	case BCH_OPT_BOOL:
> 
> base-commit: 4d37602fceff942694069cf33cc55863277bd1c2
> -- 
> 2.49.0
>