nfsd4: hash lockowners to simplify RELEASE_LOCKOWNER

Hash lockowners on just the owner string rather than on (owner, inode).
This makes the owner-string lookup needed for RELEASE_LOCKOWNER simpler
(currently it's doing at a linear search through the entire hash
table!).  That may come at the expense of making (owner, inode) lookups
more expensive if a client reuses the same lockowner across multiple
files.  We might add a separate lookup for that.

Signed-off-by: J. Bruce Fields <bfields@redhat.com>

1 files changed, 14 insertions, 28 deletions

diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index 1d6812db5099..eec990022ad3 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -3746,15 +3746,6 @@ last_byte_offset(u64 start, u64 len)
         return end > start ? end - 1: NFS4_MAX_UINT64;
 }
 
-static inline unsigned int
-lock_ownerstr_hashval(struct inode *inode, u32 cl_id,
-                struct xdr_netobj *ownername)
-{
-        return (file_hashval(inode) + cl_id
-                        + opaque_hashval(ownername->data, ownername->len))
-                & LOCK_HASH_MASK;
-}
-
 static struct list_head lock_ownerstr_hashtbl[LOCK_HASH_SIZE];
 
 /*
@@ -3824,7 +3815,7 @@ static struct nfs4_lockowner *
 find_lockowner_str(struct inode *inode, clientid_t *clid,
                 struct xdr_netobj *owner)
 {
-        unsigned int hashval = lock_ownerstr_hashval(inode, clid->cl_id, owner);
+        unsigned int hashval = open_ownerstr_hashval(clid->cl_id, owner);
         struct nfs4_lockowner *lo;
         struct nfs4_stateowner *op;
 
@@ -3847,7 +3838,7 @@ static void hash_lockowner(struct nfs4_lockowner *lo, unsigned int strhashval, s
  * Called in nfsd4_lock - therefore, OPEN and OPEN_CONFIRM (if needed) has 
  * occurred. 
  *
- * strhashval = lock_ownerstr_hashval 
+ * strhashval = open_ownerstr_hashval
  */
 
 static struct nfs4_lockowner *
@@ -3922,7 +3913,7 @@ __be32 lookup_or_create_lock_state(struct nfsd4_compound_state *cstate, struct n
                                 struct nfs4_ol_stateid, st_perstateowner);
                 return nfs_ok;
         }
-        strhashval = lock_ownerstr_hashval(fi->fi_inode, cl->cl_clientid.cl_id,
+        strhashval = open_ownerstr_hashval(cl->cl_clientid.cl_id,
                         &lock->v.new.owner);
         lo = alloc_init_lock_stateowner(strhashval, cl, ost, lock);
         if (lo == NULL)
@@ -4286,7 +4277,7 @@ nfsd4_release_lockowner(struct svc_rqst *rqstp,
         struct nfs4_ol_stateid *stp;
         struct xdr_netobj *owner = &rlockowner->rl_owner;
         struct list_head matches;
-        int i;
+        unsigned int hashval = open_ownerstr_hashval(clid->cl_id, owner);
         __be32 status;
 
         dprintk("nfsd4_release_lockowner clientid: (%08x/%08x):\n",
@@ -4301,22 +4292,17 @@ nfsd4_release_lockowner(struct svc_rqst *rqstp,
         nfs4_lock_state();
 
         status = nfserr_locks_held;
-        /* XXX: we're doing a linear search through all the lockowners.
-         * Yipes!  For now we'll just hope clients aren't really using
-         * release_lockowner much, but eventually we have to fix these
-         * data structures. */
         INIT_LIST_HEAD(&matches);
-        for (i = 0; i < LOCK_HASH_SIZE; i++) {
-                list_for_each_entry(sop, &lock_ownerstr_hashtbl[i], so_strhash) {
-                        if (!same_owner_str(sop, owner, clid))
-                                continue;
-                        list_for_each_entry(stp, &sop->so_stateids,
-                                        st_perstateowner) {
-                                lo = lockowner(sop);
-                                if (check_for_locks(stp->st_file, lo))
-                                        goto out;
-                                list_add(&lo->lo_list, &matches);
-                        }
+
+        list_for_each_entry(sop, &lock_ownerstr_hashtbl[hashval], so_strhash) {
+                if (!same_owner_str(sop, owner, clid))
+                        continue;
+                list_for_each_entry(stp, &sop->so_stateids,
+                                st_perstateowner) {
+                        lo = lockowner(sop);
+                        if (check_for_locks(stp->st_file, lo))
+                                goto out;
+                        list_add(&lo->lo_list, &matches);
                 }
         }
         /* Clients probably won't expect us to return with some (but not all)