Trond Myklebust <[email protected]> wrote:
>
> Anything that calls lock_page() should be avoided in O_DIRECT,
Why?
And it's still doing lock_page():
nfs_file_direct_write()
->filemap_fdatawrite()
->do_writepages()
->nfs_writepages()
->generic_writepages()
->mpage_writepages()
->lock_page()
> however
> we should be able to call invalidate_inode_pages() since that doesn't
> wait on the page lock.
invalidate_inode_pages2() is better. And using generic_file_direct_IO() is
better still, since it handles mmap coherency and only work upon that part
of the file which is actually undergoing IO.
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