[PATCH 07/21] nfs: add a comment explaining the use of PG_private in the NFS client

[Peter Zijlstra <a.p.zijlstra@chello.nl>]

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
CC: Trond Myklebust <trond.myklebust@fys.uio.no>
---
 fs/nfs/write.c |    5 +++++
 1 file changed, 5 insertions(+)

Index: linux-2.6/fs/nfs/write.c
===================================================================
--- linux-2.6.orig/fs/nfs/write.c
+++ linux-2.6/fs/nfs/write.c
@@ -424,6 +424,11 @@ static int nfs_inode_add_request(struct 
 		if (nfs_have_delegation(inode, FMODE_WRITE))
 			nfsi->change_attr++;
 	}
+	/*
+	 * The PG_private bit is unfortunately needed if we want to fix the
+	 * hole in the mmap semantics. If we do not set it, then the VM will
+	 * fail to call the "releasepage" address ops.
+	 */
 	SetPagePrivate(req->wb_page);
 	nfsi->npages++;
 	atomic_inc(&req->wb_count);

--
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/