cifs: define superblock-level cache index objects and register them

Define superblock-level cache index objects (managed by cifsTconInfo structs).
Each superblock object is created in a server-level index object and in itself
an index into which inode-level objects are inserted.

The superblock object is keyed by sharename. The UniqueId/IndexNumber is used to
validate that the exported share is the same since we accessed it last time.

Signed-off-by: Suresh Jayaraman <sjayaraman@suse.de>
Signed-off-by: Steve French <sfrench@us.ibm.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c
index b2063ce113ec..6e1fe3a7f27d 100644
--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -1837,6 +1837,7 @@ cifs_put_tcon(struct cifsTconInfo *tcon)
         _FreeXid(xid);
 
         tconInfoFree(tcon);
+        cifs_fscache_release_super_cookie(tcon);
         cifs_put_smb_ses(ses);
 }
 
@@ -1906,6 +1907,8 @@ cifs_get_tcon(struct cifsSesInfo *ses, struct smb_vol *volume_info)
         list_add(&tcon->tcon_list, &ses->tcon_list);
         write_unlock(&cifs_tcp_ses_lock);
 
+        cifs_fscache_get_super_cookie(tcon);
+
         return tcon;
 
 out_fail: