lkml.org 
[lkml]   [2010]   [Jul]   [5]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
SubjectRe: [rfc] new stat*fs-like syscall?
Date

Brad Boyer:
> I would suggest making it an inode operation if we do actually add it. Most
> cases are going to be per super-block, but it might be easier to transparently
> handle things like _PC_PIPE_BUF in glibc if it could call an fpathconf type
> system call on the pipe fd. I haven't looked at the current glibc code for
> that particular selector. The only one I looked at in any detail was
> _PC_LINK_MAX, which is the one you already discussed and is obviously a
> per-sb option. The only drawback I can see is that making it an inode
> operation would make the vfs_pathconf fail on a negative dentry, but that
> seems like a very strange thing to support in any case.

Recently the size of the pipe buffer becomes customizable, doesn't it?
For _PC_PIPE_BUF, fpathconf should issue fcntl(F_GETPIPE_SZ).

For negative dentry, it should be supported as long as some
standard/specification doesn't prohibit explicitly. So I still think
statfs is the best place to implement _PC_LINK_MAX.


J. R. Okajima


\
 
 \ /
  Last update: 2010-07-06 01:35    [W:0.132 / U:0.080 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site