lkml.org 
[lkml]   [2001]   [Feb]   [6]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    From
    SubjectRe: sync & asyck i/o
    Hi,

    On Tue, Feb 06, 2001 at 02:52:40PM +0000, Alan Cox wrote:
    > > According to the man page for fsync it copies in-core data to disk
    > > prior to its return. Does that take async i/o to the media in account?
    > > I.e. does it wait for completion of the async i/o to the disk?
    >
    > Undefined.

    > In practice some IDE disks do write merging and small amounts of write
    > caching in the drive firmware so you cannot trust it 100%.

    It's worth noting that it *is* defined unambiguously in the standards:
    fsync waits until all the data is hard on disk. Linux will obey that
    if it possibly can: only in cases where the hardware is actively lying
    about when the data has hit disk will the guarantee break down.

    --Stephen
    -
    To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
    the body of a message to majordomo@vger.kernel.org
    Please read the FAQ at http://www.tux.org/lkml/

    \
     
     \ /
      Last update: 2005-03-22 13:03    [W:0.021 / U:0.024 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site