linux-ext4 - Re: [PATCH] logsave : Avoid unnecessary backgrounding of logsave in case of failures

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Date:	Sat, 11 Oct 2008 00:18:09 +0530
From:	"Manish Katiyar" <mkatiyar@...il.com>
To:	"Theodore Tso" <tytso@....edu>
Cc:	ext4 <linux-ext4@...r.kernel.org>
Subject: Re: [PATCH] logsave : Avoid unnecessary backgrounding of logsave in case of failures

On Sat, Oct 11, 2008 at 12:01 AM, Theodore Tso <tytso@....edu> wrote:
> On Tue, Oct 07, 2008 at 11:14:11PM +0530, Manish Katiyar wrote:
>> Hi Ted,
>>
>> I am not sure why we wan't to background the logsave and keep retrying
>> opening the fd in case of failures.
>
> That's one of the main reason why logsave exists; the filesystem
> containing /var/log might not be mounted, or the root filesystem may
> be mounted read-only, and so the log file can't be written until the
> filesystem is remounted r/w or /var is mounted.
>
>> But there may be situations when we will never be able to succeed
>> and thus create unnecessary process. For example invoking it
>>
>> /home/mkatiyar/sbin> ./logsave /testfile ls
>
> The main use of logsave was in init.d scripts.  So I didn't really
> worry about the permissoin denied case.  Perhaps logsave should just
> fail hard and not even run the command if there is a permission denied
> error.  That would certainly be simpler...
>
>> +static void should_background(int err, int *nobackground) {
>> +     switch (err) {
>> +             case EPERM:
>> +             case EACCES:
>> +                     *nobackground = err;
>> +                     break;
>> +             default :
>> +                     *nobackground = 0;
>> +     }
>> +     return ;
>> +}
>
> Why is this its own function?

I made it that way so that in future if we want to handle any more
error numbers to bail out , we just need to add a case statement.

Thanks -
Manish

>
>                                                - Ted
>
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