[linux-cifs-client] It works

[studdugie]

What's the functional difference between directio and forcedirectio
and why would one choose one over the other?
On 1/4/06, Steven French <sfrench at us.ibm.com> wrote:
>
>
> Your patch picked up the other places llseek needs to be exported from (I
> had added those in my testing) - the is size safe to change needs to be
> modified in two ways
>
>  1) always allow files open forcedirectio to update file size (no page cache
> issues so should be safe)
>  2) for the default case (local caching, ie using page cache) if file is not
> dirty update the file size if file is dirty write the file data out and then
> update the file size - hard part is we have to check the locking around this
> operation and make sure we match all other locations that could be updating
> the filesize and we may have to lock all potentially affected pages
> (especially the final page in the file if it is a partial page) so we don't
> continue to reuse them.
>
>  I don't think we can add mmap for the forcedirectio case unless we walk
> through the complex distinctions between private vs. public mmaps and the
> analogy with directio behavior in other fs to validate the right behaviors
>
>
>
>
>  Steve French
>  Senior Software Engineer
>  Linux Technology Center - IBM Austin
>  phone: 512-838-2294
>  email: sfrench at-sign us dot ibm dot com
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>
>