Review Request 129259: Fix the buffersize in certain situations.

[taro yamada]

> On Oct. 26, 2016, 5:58 a.m., Jonathan Doman wrote:
> > src/ioslaves/file/file.cpp, line 790
> > <https://git.reviewboard.kde.org/r/129259/diff/2/?file=482957#file482957line790>
> >
> >     I don't think we should use buff.st_size at all. We now know that on "virtual" filesystems, the link's reported size is basically useless for this purpose. In the case I reported in the bug, we are allocating 2 GiB just to read a measly file path.
> >     
> >     We should just always start with a small constant (maybe 1024 is fine), and then increase as necessary.

Added initialiLimit.
Thanks!


- taro


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On Oct. 27, 2016, 4:58 a.m., taro yamada wrote:
> 
> -----------------------------------------------------------
> This is an automatically generated e-mail. To reply, visit:
> https://git.reviewboard.kde.org/r/129259/
> -----------------------------------------------------------
> 
> (Updated Oct. 27, 2016, 4:58 a.m.)
> 
> 
> Review request for KDE Frameworks.
> 
> 
> Bugs: 369275
>     https://bugs.kde.org/show_bug.cgi?id=369275
> 
> 
> Repository: kio
> 
> 
> Description
> -------
> 
> Currently, KIO uses lstat to get the buffersize for readlink.
> But in certain situations, it returns inappropriate value.
> 
> For example, "/proc/self" or "/sys/bus/cpu/devices/*" returns its size is 0 , and then readlink fails with EINVAL.(so link won't be shown in kde application.)
> TMSU seems it returns its target's actual filesize insted of the link's filesize itself.
> 
> This patch changes the buffersize to 1024 bytes if it is 0.
> And later truncate it to actual size.
> 
> 
> Diffs
> -----
> 
>   src/ioslaves/file/file.cpp 8b17d31 
> 
> Diff: https://git.reviewboard.kde.org/r/129259/diff/
> 
> 
> Testing
> -------
> 
> 
> Thanks,
> 
> taro yamada
> 
>

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