linux-kernel - Re: [RFC] killing boilerplate checks in ->link/->mkdir/->rename

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Message-Id: <E950CD52-73DC-404C-A84A-6027CAF7F6E6@dilger.ca>
Date:	Fri, 3 Feb 2012 01:25:26 -0700
From:	Andreas Dilger <adilger@...ger.ca>
To:	Al Viro <viro@...iv.linux.org.uk>
Cc:	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [RFC] killing boilerplate checks in ->link/->mkdir/->rename

On 2012-02-02, at 2:24 PM, Al Viro wrote:
> FWIW, there's something we really should've done a long time ago: putting
> that limit into sb->s_max_links.  With 0 meaning "leave all checks to
> ->link/->mkdir/->rename".  Something like the following would make a
> reasonable start - just the conversion of obvious cases.  As the next
> step I'd probably initialize it as ~0U instead of 0 and let the filesystems
> that want something trickier (reiserfs, ext4, gfs2, ocfs2) explicitly set
> it to 0 in their foo_fill_super().  That would take care of a bunch of cases
> where we forgot to do those checks (ubifs, hfsplus, jffs2, ramfs, etc.) and
> it's probably a saner default anyway.

This would also give userspace some hope of pathconf(path, _PC_LINK_MAX)
returning the actual value from the filesystem, instead of hard-coding
this into glibc itself based on the statfs-returned f_type magic value.

Cheers, Andreas





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