linux-kernel - Re: [f2fs-dev] [PATCH v2] f2fs: compress tmp files given extension

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Date:   Tue, 20 Jun 2023 23:14:23 +0800
From:   Chao Yu <chao@...nel.org>
To:     Jaegeuk Kim <jaegeuk@...nel.org>, linux-kernel@...r.kernel.org,
        linux-f2fs-devel@...ts.sourceforge.net
Subject: Re: [f2fs-dev] [PATCH v2] f2fs: compress tmp files given extension

On 2023/6/14 6:14, Jaegeuk Kim wrote:
> Let's compress tmp files for the given extension list.
> 
> This patch does not change the previous behavior, but allow the cases as below.
> 
> Extention example: "ext"
> 
> - abc.ext : allow
> - abc.ext.abc : allow
> - abc.extm : not allow
> 
> Signed-off-by: Jaegeuk Kim <jaegeuk@...nel.org>
> ---
> 
>   Change log from v1:
>    - refactor to allow abc.ext.dontcare only
> 
>   fs/f2fs/namei.c | 18 +++++++++++-------
>   1 file changed, 11 insertions(+), 7 deletions(-)
> 
> diff --git a/fs/f2fs/namei.c b/fs/f2fs/namei.c
> index 3e35eb7dbb8f..49573ef4115d 100644
> --- a/fs/f2fs/namei.c
> +++ b/fs/f2fs/namei.c
> @@ -23,7 +23,7 @@
>   #include <trace/events/f2fs.h>
>   
>   static inline bool is_extension_exist(const unsigned char *s, const char *sub,
> -						bool tmp_ext)
> +						bool tmp_ext, bool tmp_dot)
>   {
>   	size_t slen = strlen(s);
>   	size_t sublen = strlen(sub);
> @@ -49,8 +49,12 @@ static inline bool is_extension_exist(const unsigned char *s, const char *sub,
>   	for (i = 1; i < slen - sublen; i++) {
>   		if (s[i] != '.')
>   			continue;
> -		if (!strncasecmp(s + i + 1, sub, sublen))
> -			return true;
> +		if (!strncasecmp(s + i + 1, sub, sublen)) {
> +			if (!tmp_dot)
> +				return true;
> +			if (i == slen - sublen - 1 || s[i + 1 + sublen] == '.')

Do you mean?

if (i == slen - sublen - 1 && s[i + 1 + sublen] == '.')

> +				return true;
> +		}
>   	}
>   
>   	return false;
> @@ -148,7 +152,7 @@ static void set_compress_new_inode(struct f2fs_sb_info *sbi, struct inode *dir,
>   	cold_count = le32_to_cpu(sbi->raw_super->extension_count);
>   	hot_count = sbi->raw_super->hot_ext_count;
>   	for (i = cold_count; i < cold_count + hot_count; i++)
> -		if (is_extension_exist(name, extlist[i], false))
> +		if (is_extension_exist(name, extlist[i], false, false))

Parameters should be consistent w/ the one in set_file_temperature()?

if (is_extension_exist(name, extlist[i], true, false))

>   			break;
>   	f2fs_up_read(&sbi->sb_lock);
>   	if (i < (cold_count + hot_count))
> @@ -156,12 +160,12 @@ static void set_compress_new_inode(struct f2fs_sb_info *sbi, struct inode *dir,
>   
>   	/* Don't compress unallowed extension. */
>   	for (i = 0; i < noext_cnt; i++)
> -		if (is_extension_exist(name, noext[i], false))
> +		if (is_extension_exist(name, noext[i], false, false))

is_extension_exist(name, noext[i], true, true) ?

Thanks,

>   			return;
>   
>   	/* Compress wanting extension. */
>   	for (i = 0; i < ext_cnt; i++) {
> -		if (is_extension_exist(name, ext[i], false)) {
> +		if (is_extension_exist(name, ext[i], true, true)) {
>   			set_compress_context(inode);
>   			return;
>   		}
> @@ -189,7 +193,7 @@ static void set_file_temperature(struct f2fs_sb_info *sbi, struct inode *inode,
>   	cold_count = le32_to_cpu(sbi->raw_super->extension_count);
>   	hot_count = sbi->raw_super->hot_ext_count;
>   	for (i = 0; i < cold_count + hot_count; i++)
> -		if (is_extension_exist(name, extlist[i], true))
> +		if (is_extension_exist(name, extlist[i], true, false))
>   			break;
>   	f2fs_up_read(&sbi->sb_lock);
>