linux-ext4 - Re: [PATCH 05/11] unicode: pass a UNICODE_AGE() tripple to utf8

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Date:   Mon, 06 Sep 2021 18:16:24 -0400
From:   Gabriel Krisman Bertazi <krisman@...labora.com>
To:     Christoph Hellwig <hch@....de>
Cc:     Shreeya Patel <shreeya.patel@...labora.com>,
        linux-fsdevel@...r.kernel.org, linux-ext4@...r.kernel.org,
        linux-f2fs-devel@...ts.sourceforge.net
Subject: Re: [PATCH 05/11] unicode: pass a UNICODE_AGE() tripple to utf8_load

Gabriel Krisman Bertazi <krisman@...labora.com> writes:

> Christoph Hellwig <hch@....de> writes:
>
>> Don't bother with pointless string parsing when the caller can just pass
>> the version in the format that the core expects.  Also remove the
>> fallback to the latest version that none of the callers actually uses.
>>
>> Signed-off-by: Christoph Hellwig <hch@....de>
>> ---
>>  fs/ext4/super.c            | 10 ++++----
>>  fs/f2fs/super.c            | 10 ++++----
>>  fs/unicode/utf8-core.c     | 50 ++++----------------------------------
>>  fs/unicode/utf8-norm.c     | 11 ++-------
>>  fs/unicode/utf8-selftest.c | 15 ++++++------
>>  fs/unicode/utf8n.h         | 14 ++---------
>>  include/linux/unicode.h    | 11 ++++++++-
>>  7 files changed, 37 insertions(+), 84 deletions(-)
>>
>> diff --git a/fs/ext4/super.c b/fs/ext4/super.c
>> index a68be582bba5..be418a30b52e 100644
>> --- a/fs/ext4/super.c
>> +++ b/fs/ext4/super.c
>> @@ -2016,9 +2016,9 @@ static const struct mount_opts {
>>  static const struct ext4_sb_encodings {
>>  	__u16 magic;
>>  	char *name;
>> -	char *version;
>> +	unsigned int version;
>>  } ext4_sb_encoding_map[] = {
>> -	{EXT4_ENC_UTF8_12_1, "utf8", "12.1.0"},
>> +	{EXT4_ENC_UTF8_12_1, "utf8", UNICODE_AGE(12, 1, 0)},
>>  };
>>  
>>  static const struct ext4_sb_encodings *
>> @@ -4308,15 +4308,15 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
>>  		encoding = utf8_load(encoding_info->version);
>>  		if (IS_ERR(encoding)) {
>>  			ext4_msg(sb, KERN_ERR,
>> -				 "can't mount with superblock charset: %s-%s "
>> +				 "can't mount with superblock charset: %s-0x%x "
>>  				 "not supported by the kernel. flags: 0x%x.",
>>  				 encoding_info->name, encoding_info->version,
>>  				 encoding_flags);
>>  			goto failed_mount;
>
> "Using encoding defined by superblock: utf8-0xc0100 with flags 0x0"
>
> This is much less readable than what we previously had:
>
> "Using encoding defined by superblock: utf8-12.1.0 with flags 0x0"
>
> It is minor, but can we do instead:
>
> ext4_msg("... %u.%u.%u\n", (encoding_info->version>>12) & 0xff,
> 	 (encoding_info->version>>8) & 0xff), encoding_info->version & 0xff))
>
> The rest of the series looks good and I can pick it up for 5.15, unless
> someone has anything else to say?  It has lived on the list for a while
> now.
>

Ugh, pressed reply too quickly.  Sorry for the multiple email reply.

In the summary line: tripple -> triple.

-- 
Gabriel Krisman Bertazi