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    SubjectRe: [PATCH] O_DIRECT for ext3 (2.4.21)
    Andrew Morton <> wrote:
    > I think the check should be implemented in (the new) ext3_open(). Because
    > checking the return from open() is the way in which a good application would
    > determine whether the underlying fs supports O_DIRECT.
    > Unfortunately O_DIRECT can also be set with fcntl(F_SETFL), and we seem to
    > have forgotten to provide a way for the fs to be told about fcntl.

    It works out OK in 2.5, and we should do it this way in 2.4 too:

    - dentry_open() checks for inode->i_mapping->a_ops->direct_IO

    - setfl() checks for inode->i_mapping->a_ops->direct_IO

    - the a_ops for data-journalled inodes have a null ->direct_IO.

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      Last update: 2005-03-22 13:36    [W:0.019 / U:7.448 seconds]
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