Re: [RFC PATCH] fpathconf() for fsync() behavior

Christoph Hellwig
2009-04-23T11:11:59Z

On Wed, Apr 22, 2009 at 08:12:57PM -0400, Valerie Aurora Henson wrote:
> In the default mode for ext3 and btrfs, fsync() is both slow and
> unnecessary for some important application use cases - at the same
> time that it is absolutely required for correctness for other modes of
> ext3, ext4, XFS, etc. If applications could easilyl distinguish
> between the two cases, they would be more likely to be correct and
> fast.
>
> How about an fpathconf() variable, something like _PC_ORDERED? E.g.:

Before we add any new fpathconf varibale we need a reall (f)pathconf(at)
syscall so that the fs driver can exposed it's characteristics, having
to replicate that information to glibc especially for something required
for data integrity is a receipe for a desaster.