[PATCH] knfsd: nfsd4: reboot hash

For the purposes of reboot recovery we keep a directory with subdirectories
each having a name that is the ascii hex representation of the md5 sum of a
client identifier for an active client.

This adds the code to calculate that name.  We also use it for the purposes of
comparing clients, so if someone ever manages to find two client names that
are md5 collisions, then we'll return clid_inuse to the second.

Signed-off-by: Andy Adamson <andros@citi.umich.edu>
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
Signed-off-by: Neil Brown <neilb@cse.unsw.edu.au>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 5 insertions, 1 deletions

diff --git a/include/linux/nfsd/state.h b/include/linux/nfsd/state.h
index 296e6429fc3b..fdaa84addadb 100644
--- a/include/linux/nfsd/state.h
+++ b/include/linux/nfsd/state.h
@@ -109,6 +109,8 @@ struct nfs4_callback {
         struct rpc_clnt *       cb_client;
 };
 
+#define HEXDIR_LEN     33 /* hex version of 16 byte md5 of cl_name plus '\0' */
+
 /*
  * struct nfs4_client - one per client.  Clientids live here.
  *      o Each nfs4_client is hashed by clientid.
@@ -126,6 +128,7 @@ struct nfs4_client {
         struct list_head        cl_del_perclnt; /* list: delegations */
         struct list_head        cl_lru;         /* tail queue */
         struct xdr_netobj       cl_name;        /* id generated by client */
+        char                    cl_recdir[HEXDIR_LEN]; /* recovery dir */
         nfs4_verifier           cl_verifier;    /* generated by client */
         time_t                  cl_time;        /* time of last lease renewal */
         u32                     cl_addr;        /* client ipaddress */
@@ -143,7 +146,7 @@ struct nfs4_client {
  */
 struct nfs4_client_reclaim {
         struct list_head        cr_strhash;     /* hash by cr_name */
-        struct xdr_netobj       cr_name;        /* id generated by client */
+        char                    cr_recdir[HEXDIR_LEN]; /* recover dir */
 };
 
 static inline void
@@ -283,6 +286,7 @@ extern void nfs4_free_stateowner(struct kref *kref);
 extern void nfsd4_probe_callback(struct nfs4_client *clp);
 extern void nfsd4_cb_recall(struct nfs4_delegation *dp);
 extern void nfs4_put_delegation(struct nfs4_delegation *dp);
+extern int nfs4_make_rec_clidname(char *clidname, struct xdr_netobj *clname);
 
 static inline void
 nfs4_put_stateowner(struct nfs4_stateowner *so)