Re: [PATCH] aio: propogate post-EIOCBQUEUED errors to completion event
From: Zach Brown
Date: Tue Feb 20 2007 - 13:41:33 EST
There are some strange O_DIRECT corner cases in here such that the
writer' may actually be a 'last reader' and winning can mean have
of the page in page cache older than the copy on disk.
As long as it is marked dirty so that it eventually gets synced to
it shouldn't matter.
No, Chris is pointing out that an an O_DIRECT write can leave clean
read pages in the page cache.
All it takes is giving a source buffer for the write which is an mmap
()ed apeture of the region that is being written to. If you get the
offsets right you can get the get_user_pages() down in fs/direct-io.c
will populate the page cache before the actual O_DIRECT write gets to
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/