From 6f2e64d3e1f661095e274c9d9d47e3f39a6cf1c0 Mon Sep 17 00:00:00 2001 From: Trond Myklebust Date: Fri, 6 Jul 2007 10:53:21 -0400 Subject: NFSv4: Make the NFS state model work with the nosharedcache mount option Consider the case where the user has mounted the remote filesystem server:/foo on the two local directories /bar and /baz using the nosharedcache mount option. The files /bar/file and /baz/file are represented by different inodes in the local namespace, but refer to the same file /foo/file on the server. Consider the case where a process opens both /bar/file and /baz/file, then closes /bar/file: because the nfs4_state is not shared between /bar/file and /baz/file, the kernel will see that the nfs4_state for /bar/file is no longer referenced, so it will send off a CLOSE rpc call. Unless the open_owners differ, then that CLOSE call will invalidate the open state on /baz/file too. Conclusion: we cannot share open state owners between two different non-shared mount instances of the same filesystem. Signed-off-by: Trond Myklebust --- fs/nfs/nfs4_fs.h | 1 + 1 file changed, 1 insertion(+) (limited to 'fs/nfs/nfs4_fs.h') diff --git a/fs/nfs/nfs4_fs.h b/fs/nfs/nfs4_fs.h index dd1aa2b598c..6c028e734fe 100644 --- a/fs/nfs/nfs4_fs.h +++ b/fs/nfs/nfs4_fs.h @@ -83,6 +83,7 @@ struct nfs_unique_id { struct nfs4_state_owner { struct nfs_unique_id so_owner_id; struct nfs_client *so_client; + struct nfs_server *so_server; struct rb_node so_client_node; struct rpc_cred *so_cred; /* Associated cred */ -- cgit v1.2.3