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Re: [Cluster-devel] fallocate vs O_(D)SYNC



On Wed, Nov 16, 2011 at 11:54:13AM +0100, Jan Kara wrote:
>   Yeah, only that nobody calls that fsync() automatically if the fd is
> O_SYNC if I'm right. But maybe calling fdatasync() on the range which was
> fallocated from sys_fallocate() if the fd is O_SYNC would do the trick for
> most filesystems? That would match how we treat O_SYNC for other operations
> as well. I'm just not sure whether XFS wouldn't take unnecessarily big hit
> with this.

This would work fine with XFS and be equivalent to what it does for
O_DSYNC now.  But I'd rather see every filesystem do the right thing
and make sure the update actually is on disk when doing O_(D)SYNC
operations.


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