GFS2: Make writeback more responsive to system conditions

This patch adds writeback_control to writing back the AIL
list. This means that we can then take advantage of the
information we get in ->write_inode() in order to set off
some pre-emptive writeback.

In addition, the AIL code is cleaned up a bit to make it
a bit simpler to understand.

There is still more which can usefully be done in this area,
but this is a good start at least.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/fs/gfs2/inode.c b/fs/gfs2/inode.c
index 9b7b9e40073b..94c3a7db1116 100644
--- a/fs/gfs2/inode.c
+++ b/fs/gfs2/inode.c
@@ -74,14 +74,14 @@ static int iget_set(struct inode *inode, void *opaque)
         return 0;
 }
 
-struct inode *gfs2_ilookup(struct super_block *sb, u64 no_addr)
+struct inode *gfs2_ilookup(struct super_block *sb, u64 no_addr, int non_block)
 {
         unsigned long hash = (unsigned long)no_addr;
         struct gfs2_skip_data data;
 
         data.no_addr = no_addr;
         data.skipped = 0;
-        data.non_block = 0;
+        data.non_block = non_block;
         return ilookup5(sb, hash, iget_test, &data);
 }