From c2549f8c7a28c00facaf911f700c4811cfd6f52b Mon Sep 17 00:00:00 2001 From: Mike Marshall Date: Mon, 25 Mar 2019 15:52:29 -0400 Subject: orangefs: remember count when reading. Orangefs wins when it can do IO on large (up to four meg) blocks at a time, and looses when it has to do tiny "small io" reads and writes. Accessing Orangefs through the pagecache with the kernel module helps with small io, both reading and writing, a great deal. Readpage generally tries to fetch a page (four k) at a time. We'll let users use "count" (as in read(2) or pread(2) for example) as a knob to control how much data they get from Orangefs at a time and we'll try to use the data to fill extra pagecache pages when we get to ->readpage, hopefully resulting in fewer calls to readpage and Orangefs userspace. We need a way to remember how they set count so that we can still have it available when we get to ->readpage. - We'll use file->private_data to keep track of "count". We'll wrap generic_file_open with orangefs_file_open and initialize private_data to NULL there. - In ->read_iter we have access to both "count" and file, so we'll kmalloc some space onto file->private_data and store "count" there. - We'll kfree file->private_data each time we visit ->flush and reinitialize it to NULL. Signed-off-by: Mike Marshall Signed-off-by: Martin Brandenburg --- fs/orangefs/orangefs-kernel.h | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'fs/orangefs/orangefs-kernel.h') diff --git a/fs/orangefs/orangefs-kernel.h b/fs/orangefs/orangefs-kernel.h index 87beab10326a..3ae2f129b9c7 100644 --- a/fs/orangefs/orangefs-kernel.h +++ b/fs/orangefs/orangefs-kernel.h @@ -239,6 +239,10 @@ struct orangefs_write_range { kgid_t gid; }; +struct orangefs_read_options { + ssize_t blksiz; +}; + extern struct orangefs_stats orangefs_stats; /* -- cgit v1.2.3-59-g8ed1b