lkml.org 
[lkml]   [2007]   [Mar]   [5]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    From
    SubjectRe: [RFC] Heads up on sys_fallocate()
    On Sun, Mar 04, 2007 at 11:22:06PM +0000, Anton Altaparmakov wrote:
    > And I specifically did NOT update the initialized size in the inode
    > thus it will remain at its old value thus all new allocated blocks
    > will be considered as present but not initialized thus a read will
    > always return zero whilst a write will do the right thing and pad
    > with zeroes as necessary (if the write is smaller than the block
    > size, etc).

    Anton,

    You're describing a method of doing in-advance preallocation
    where the filesystem format explicitly has support for this kind of
    feature in a way that doesn't require pre-zeroing the data blocks in
    question.

    The question which this subthread was concerned about was
    whether the kernel should get involved in initializing datablocks in
    the case where the filesystem format does not have this support, or
    whether this functionality should continue to be done in userspace.
    Given that glibc already has to support this for older kernels, I
    would argue that there's no point putting in generic support for
    filesystem that can't support a more advanced way of doing things.

    Regards,

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

    \
     
     \ /
      Last update: 2007-03-05 15:41    [W:5.208 / U:0.024 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site