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Re: [PATCH 3/3] Add timeout feature

To: Miklos Szeredi <miklos@xxxxxxxxxx>
Subject: Re: [PATCH 3/3] Add timeout feature
From: Dave Chinner <david@xxxxxxxxxxxxx>
Date: Wed, 9 Jul 2008 17:33:58 +1000
Cc: arjan@xxxxxxxxxxxxx, hch@xxxxxxxxxxxxx, tytso@xxxxxxx, pavel@xxxxxxx, t-sato@xxxxxxxxxxxxx, akpm@xxxxxxxxxxxxxxxxxxxx, viro@xxxxxxxxxxxxxxxxxx, linux-ext4@xxxxxxxxxxxxxxx, xfs@xxxxxxxxxxx, dm-devel@xxxxxxxxxx, linux-fsdevel@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, axboe@xxxxxxxxx, mtk.manpages@xxxxxxxxxxxxxx
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On Wed, Jul 09, 2008 at 09:13:34AM +0200, Miklos Szeredi wrote:
> On Wed, 9 Jul 2008, Dave Chinner wrote:
> > The argument against Miklos' version is that there may be multiple
> > commands to execute while the fs is frozen.
> 
> Which is what a shell is for ;)

Yeah, weĺl, with your method I ca't tell a user to:

        # xfs_freeze -f /mntpt
        # xfs_db -r -c 'sb 0' -c 'p rootino' /dev/foo
        128
        # xfs_db -r -c 'ino 128' -c 'p core.format' /dev/foo
        core.format = 2 (extents)
        # xfs_db .....
        .....
        # xfs_freeze -u /mntpt

i.e. using the freeze to force all metadata to disk and
prevent it from changing while doing interactive debugging
of some problem.

Yes, a one-shot freeze/unfreeze mechanism works for some
use cases. The point is that it does not work for them all.....

Cheers,

Dave.
-- 
Dave Chinner
david@xxxxxxxxxxxxx


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