NFSv4: Handle the special Linux file open access mode
According to the open() manpage, Linux reserves the access mode 3
to mean "check for read and write permission on the file and return
a file descriptor that can't be used for reading or writing."
Currently, the NFSv4 code will ask the server to open the file,
and will use an incorrect share access mode of 0. Since it has
an incorrect share access mode, the client later forgets to send
a corresponding close, meaning it can leak stateids on the server.
Fixes: ce4ef7c0a8a05 ("NFS: Split out NFS v4 file operations")
Cc: stable@vger.kernel.org # 3.6+
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
diff --git a/fs/nfs/inode.c b/fs/nfs/inode.c
index 0b4a1a9..5377781 100644
--- a/fs/nfs/inode.c
+++ b/fs/nfs/inode.c
@@ -1100,6 +1100,7 @@ int nfs_open(struct inode *inode, struct file *filp)
nfs_fscache_open_file(inode, filp);
return 0;
}
+EXPORT_SYMBOL_GPL(nfs_open);
/*
* This function is called whenever some part of NFS notices that