Hi,
On Fri, Oct 27, 2000 at 05:21:23PM -0700, Peter J. Braam wrote:
>
> Chris pointed out to me that there are a few cases where InterMezzo has some
> difficulties with nested transactions: look at truncate. Nesting here would
> disable the possibility in Ext3 to break the transaction up.
Actually, ext3 will keep truncate atomic quite happily, as long as you
are willing for the "current" transaction to have changed once you get
to the end of the truncate. If recovery hits one of the transaction
breaks in the middle of a long truncate, it will find the inode on the
list of "orphaned" inodes and will complete the truncate on recovery.
In practice, this implies that you can rely on truncate being atomic
iff it is the last operation you perform in a nested transaction.
This is clearly an ext3-specific implementation property, though.
Cheers,
Stephen
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