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SubjectRe: [PATCH v3 1/2] fs: New zonefs file system
Date
On 2019/12/25 16:20, Damien Le Moal wrote:
> On 2019/12/25 15:05, Damien Le Moal wrote:
>>>> + inode->i_mode = S_IFREG;
>>>
>>> i_mode &= ~S_IRWXUGO; ?
>>
>> Yes, indeed that is better. checkpatch.pl does spit out a warning if one
>> uses the S_Ixxx macros though. See below.
>
> Please disregard this comment. checkpatch is fine. For some reasons I
> had warnings in the past but they are now gone. So using the macros
> instead of the harder to read hard-coded values.

Retracting this... My apologies for the noise.

Checkpatch does complain about the use of symbolic permissions:

WARNING: Symbolic permissions 'S_IRWXUGO' are not preferred. Consider
using octal permissions '0777'.
#657: FILE: fs/zonefs/super.c:400:
+ inode->i_mode &= ~S_IRWXUGO;

I do not understand why this would be a problem. I still went ahead and
used the macros as I find the code more readable using them. Please let
me know if that is not recommended (checking the code, not surprisingly,
many FS use these macros).

>
>>
>>>
>>> Note that clearing the mode flags won't prevent programs with an
>>> existing writable fd from being able to call write(). I'd imagine that
>>> they'd hit EIO pretty fast though, so that might not matter.
>>>
>>>> + zone->wp = zone->start;
>>>> + } else if (zone->cond == BLK_ZONE_COND_READONLY) {
>>>> + inode->i_flags |= S_IMMUTABLE;
>>>> + inode->i_mode &= ~(0222); /* S_IWUGO */
>>>
>>> Might as well just use S_IWUGO directly here?
>
> Yes, I did in v4.
>
>> Because checkpatch spits out a warning if I do. I would prefer using the
>> macro as I find it much easier to read. Should I just ignore checkpatch
>> warning ?
>
> My mistake. No warnings :)
>
>


--
Damien Le Moal
Western Digital Research

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