Re: New concept of ext3 disk checks

[Theodore Ts'o]

On Fri, Aug 13, 2004 at 01:24:33AM +0200, Andi Kleen wrote:
> Theodore Ts'o <tytso@xxxxxxx> writes:
> 
> > 4) If there were no errors detecting by the fsck run, run the command
> > "tune2fs -C 0 -T now /dev/XXX" on the live filesystem.  This sets the
> > mount count and last filesystem checked time to the appropriate values
> > in the superblock.
> 
> Is it safe now to run tune2fs on a mounted busy fs? afaik it would
> need at least support to quiescence the fs temporarily. Otherwise you 
> have a race window where changes to the superblock could get lost.

Modern versions of e2fsprogs do byte-level writes only to the fields
that are being changed by the userspace program; given that these are
fields that are not touched by the kernel once the filesystem is
mounted, this is safe.

						- Ted

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