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    SubjectRe: [PATCH 2/3] buffer writes to sysfs
    On Mon, Jan 24, 2005 at 10:37:00AM -0800, Mitch Williams wrote:
    > On Sat, 22 Jan 2005, Greg KH wrote:
    > >
    > > On Fri, Jan 21, 2005 at 02:52:29PM -0800, Mitch Williams wrote:
    > > > This patch buffers writes to sysfs files and flushes them to the
    > > kobject
    > > > owner when the file is closed.
    > >
    > > Why? This breaks the way things work today, right?
    > >
    > > What is this patch trying to fix?
    > >
    > To be honest, I'm a bit ambivalent about this patch. I wrote this code in
    > response to a bug filed by our test lab. If you write a bunch (e.g. > 1K)
    > of data to a sysfs file, the c library splits it up into multiple writes
    > of 1K or less. Because the kobject store method doesn't support offsets,
    > and because the call to copy_from_user doesn't honor offsets, you end up
    > with multiple calls to the store method, with incorrect results and no
    > error code.

    Who is trying to send > 1K to a sysfs file? Remember, sysfs files are
    for 1 value only. If you consider > 1K a "single value" please point me
    to that part of the kernel that does that.

    > To the typical user, there's really no difference in behavior, unless you
    > are writing a ton of data into the file. Of course, there's the obvious
    > question of why you'd want to do so...

    Exactly, you should not be doing that anyway. So, because of that, I
    really don't want/like this patch.


    greg k-h
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