linux-ext4 - [Bug 15910] zero-length files and performance degradation

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Message-Id: <201005060418.o464IxOB012196@demeter.kernel.org>
Date:	Thu, 6 May 2010 04:18:59 GMT
From:	bugzilla-daemon@...zilla.kernel.org
To:	linux-ext4@...r.kernel.org
Subject: [Bug 15910] zero-length files and performance degradation

https://bugzilla.kernel.org/show_bug.cgi?id=15910


Eric Sandeen <sandeen@...hat.com> changed:

           What    |Removed                     |Added
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                 CC|                            |sandeen@...hat.com




--- Comment #3 from Eric Sandeen <sandeen@...hat.com>  2010-05-06 04:18:57 ---
(In reply to comment #2)

> May be it is useful to introduce compat mount option which force fsync()
> internaly inside rename(). Renames is not what frequent operation so it has
> much less performance penalty as real ordered mode.

ext4 does already have allocate-on-rename heuristics, though not exactly
fsync()

        if (retval == 0 && force_da_alloc)
                ext4_alloc_da_blocks(old_inode);
from

commit 8750c6d5fcbd3342b3d908d157f81d345c5325a7
Author: Theodore Ts'o <tytso@....edu>
Date:   Mon Feb 23 23:05:27 2009 -0500

    ext4: Automatically allocate delay allocated blocks on rename

still, more mount options doesn't seem to solve the problem to me, in the end
applications can't rely on it...

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