cifs: have cifsFileInfo hold a reference to a tlink rather than tcon pointer

cifsFileInfo needs a pointer to a tcon, but it doesn't currently hold a
reference to it. Change it to keep a pointer to a tcon_link instead and
hold a reference to it.

That will keep the tcon from being freed until the file is closed.

Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/fs/cifs/cifsfs.c b/fs/cifs/cifsfs.c
index 898d2a5cfad2..b2fd075dc2e6 100644
--- a/fs/cifs/cifsfs.c
+++ b/fs/cifs/cifsfs.c
@@ -595,7 +595,8 @@ static int cifs_setlease(struct file *file, long arg, struct file_lock **lease)
             ((arg == F_WRLCK) &&
                 (CIFS_I(inode)->clientCanCacheAll)))
                 return generic_setlease(file, arg, lease);
-        else if (cfile->tcon->local_lease && !CIFS_I(inode)->clientCanCacheRead)
+        else if (tlink_tcon(cfile->tlink)->local_lease &&
+                 !CIFS_I(inode)->clientCanCacheRead)
                 /* If the server claims to support oplock on this
                    file, then we still need to check oplock even
                    if the local_lease mount option is set, but there