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    SubjectRe: [RFC PATCH] fpathconf() for fsync() behavior
    On Thu, Apr 23, 2009 at 07:11:47AM -0400, Christoph Hellwig wrote:
    > 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.

    I think a real pathconf() is a great idea, regardless of the solution
    for this exact problem. Anyone want to beat me to the patch? I
    really need to be working on union mounts right now.


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