linux-ext4 - Re: [PATCH e2fsprogs 3/9] libe2p: Helpers for configuring the encoding superblock fields

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Date:   Mon, 19 Nov 2018 10:28:48 -0500
From:   Gabriel Krisman Bertazi <krisman@...labora.com>
To:     "Theodore Y. Ts'o" <tytso@....edu>
Cc:     linux-ext4@...r.kernel.org
Subject: Re: [PATCH e2fsprogs 3/9] libe2p: Helpers for configuring the encoding superblock fields

"Theodore Y. Ts'o" <tytso@....edu> writes:

> On Mon, Oct 15, 2018 at 05:12:14PM -0400, Gabriel Krisman Bertazi wrote:
>> +#define EXT4_ENC_STRICT_MODE_FL		(1 << 0) /* Reject invalid sequences? */
>
> Why the question mark?

Hi Ted,

The question mark is very redundant for a flag, I admit :).  It meant to
say "Whether to reject invalid sequences" or something like that.  Will
fix in the v2.

>> +#define UTF8_NORMALIZATION_TYPE_NFKD	(1 << 1)
>> +#define UTF8_CASEFOLD_TYPE_NFKDCF	(1 << 4)
>> +
>> +static const struct ext4_sb_encoding_map {
>> +	char *name;
>> +	__u16 default_flags;
>> +} ext4_encoding_map[] = {
>> +	/* 0x0 */ { "ascii", 0x0},
>> +	/* 0x1 */ {"utf8-10.0.0", UTF8_NORMALIZATION_TYPE_NFKD|UTF8_CASEFOLD_TYPE_NFKDCF},
>> +	{0x0, 0x0},
>> +};
>> +
>>  #endif	/* _LINUX_EXT2_FS_H */
>
> What uses this?  I can't find any other references in either the kernel or
> e2fsprogs patches.

Only the instance ext4_encoding_map, itself, is used in this patch and
in the next one, which modifies mkefs.  It stores the string for
comparison with what the user passed in the command line.

I guess naming the structure is unnecessary, since we have only this
single const static instance.  I will change that in the v2, as well.

The current series doesn't include the huge utf8 stuff, which makes use
of the rest of the flags, but I will add that in v2 as well.

Thanks!

-- 
Gabriel Krisman Bertazi