| To: | "Rick Smith" <rgsmith72@xxxxxxxxxxx> |
|---|---|
| Subject: | Re: O_DIRECT address restrictions |
| From: | Andrew Morton <akpm@xxxxxxxxx> |
| Date: | Thu, 15 May 2003 18:32:48 -0700 |
| Cc: | linux-xfs@xxxxxxxxxxx |
| In-reply-to: | <Sea2-F35IOvGqI3vMLc0000f253@hotmail.com> |
| References: | <Sea2-F35IOvGqI3vMLc0000f253@hotmail.com> |
| Sender: | linux-xfs-bounce@xxxxxxxxxxx |
"Rick Smith" <rgsmith72@xxxxxxxxxxx> wrote: > > What are the memory address restrictions when using the O_DIRECT flag > with XFS? I am trying to perform I/O directly from the filesystem to a piece > of mmap'ed video memory and I get the "bad address" error when I attempt to > do so with O_DIRECT. It cannot be done - O_DIRECT only supports IO against legitimate RAM (memory which is described by the pageframes in mem_map[]). |
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