commit 277866a0e3a4f97e859f7a621f5b4f5359c9526c
author Peter Zijlstra <a.p.zijlstra@chello.nl> Tue May 08 00:35:12 2007 -0700
committer Linus Torvalds <torvalds@woody.linux-foundation.org> Tue May 08 11:15:21 2007 -0700
tree 20b244f5c0c7b6a692f0290f70f0fefae9d88d5a
parent 79df3c19aa601d264719b04e3a788a7b852f4859

nfs: fix congestion control: use atomic_longs

Change the atomic_t in struct nfs_server to atomic_long_t in anticipation
of machines that can handle 8+TB of (4K) pages under writeback.

However I suspect other things in NFS will start going *bang* by then.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Trond Myklebust <trond.myklebust@fys.uio.no>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

fs/nfs/write.c

diff --git a/fs/nfs/write.c b/fs/nfs/write.c
index 522cd41..de92b95 100644
--- a/fs/nfs/write.c
+++ b/fs/nfs/write.c
@@ -224,7 +224,7 @@
 		struct inode *inode = page->mapping->host;
 		struct nfs_server *nfss = NFS_SERVER(inode);
 
-		if (atomic_inc_return(&nfss->writeback) >
+		if (atomic_long_inc_return(&nfss->writeback) >
 				NFS_CONGESTION_ON_THRESH)
 			set_bdi_congested(&nfss->backing_dev_info, WRITE);
 	}
@@ -237,7 +237,7 @@
 	struct nfs_server *nfss = NFS_SERVER(inode);
 
 	end_page_writeback(page);
-	if (atomic_dec_return(&nfss->writeback) < NFS_CONGESTION_OFF_THRESH) {
+	if (atomic_long_dec_return(&nfss->writeback) < NFS_CONGESTION_OFF_THRESH) {
 		clear_bdi_congested(&nfss->backing_dev_info, WRITE);
 		congestion_end(WRITE);
 	}