ocfs2/dlm: Remove struct dlm_lock_name in struct dlm_master_list_entry

This patch removes struct dlm_lock_name and adds the entries directly
to struct dlm_master_list_entry. Under the new scheme, both mles that
are backed by a lockres or not, will have the name populated in mle->mname.
This allows us to get rid of code that was figuring out the location of
the mle name.

Signed-off-by: Sunil Mushran <sunil.mushran@oracle.com>
Signed-off-by: Mark Fasheh <mfasheh@suse.com>

3 files changed, 23 insertions, 71 deletions

diff --git a/fs/ocfs2/dlm/dlmcommon.h b/fs/ocfs2/dlm/dlmcommon.h
index 266fde9354bd..0102be35980c 100644
--- a/fs/ocfs2/dlm/dlmcommon.h
+++ b/fs/ocfs2/dlm/dlmcommon.h
@@ -56,12 +56,6 @@ enum dlm_mle_type {
         DLM_MLE_NUM_TYPES
 };
 
-struct dlm_lock_name {
-        unsigned int hash;
-        unsigned int len;
-        unsigned char name[DLM_LOCKID_NAME_MAX];
-};
-
 struct dlm_master_list_entry {
         struct hlist_node master_hash_node;
         struct list_head hb_events;
@@ -80,10 +74,10 @@ struct dlm_master_list_entry {
         enum dlm_mle_type type;
         struct o2hb_callback_func mle_hb_up;
         struct o2hb_callback_func mle_hb_down;
-        union {
-                struct dlm_lock_resource *mleres;
-                struct dlm_lock_name mlename;
-        } u;
+        struct dlm_lock_resource *mleres;
+        unsigned char mname[DLM_LOCKID_NAME_MAX];
+        unsigned int mnamelen;
+        unsigned int mnamehash;
 };
 
 enum dlm_ast_type {
diff --git a/fs/ocfs2/dlm/dlmdebug.c b/fs/ocfs2/dlm/dlmdebug.c
index bf9fa270ee98..bdf1c7817bb5 100644
--- a/fs/ocfs2/dlm/dlmdebug.c
+++ b/fs/ocfs2/dlm/dlmdebug.c
@@ -287,18 +287,8 @@ static int stringify_nodemap(unsigned long *nodemap, int maxnodes,
 static int dump_mle(struct dlm_master_list_entry *mle, char *buf, int len)
 {
         int out = 0;
-        unsigned int namelen;
-        unsigned char *name;
         char *mle_type;
 
-        if (mle->type != DLM_MLE_MASTER) {
-                name = mle->u.mlename.name;
-                namelen = mle->u.mlename.len;
-        } else {
-                name  = (unsigned char *)mle->u.mleres->lockname.name;
-                namelen = mle->u.mleres->lockname.len;
-        }
-
         if (mle->type == DLM_MLE_BLOCK)
                 mle_type = "BLK";
         else if (mle->type == DLM_MLE_MASTER)
@@ -306,7 +296,7 @@ static int dump_mle(struct dlm_master_list_entry *mle, char *buf, int len)
         else
                 mle_type = "MIG";
 
-        out += stringify_lockname(name, namelen, buf + out, len - out);
+        out += stringify_lockname(mle->mname, mle->mnamelen, buf + out, len - out);
         out += snprintf(buf + out, len - out,
                         "\t%3s\tmas=%3u\tnew=%3u\tevt=%1d\tuse=%1d\tref=%3d\n",
                         mle_type, mle->master, mle->new_master,
diff --git a/fs/ocfs2/dlm/dlmmaster.c b/fs/ocfs2/dlm/dlmmaster.c
index d9c5c5a34007..f8b653fcd4dd 100644
--- a/fs/ocfs2/dlm/dlmmaster.c
+++ b/fs/ocfs2/dlm/dlmmaster.c
@@ -68,41 +68,16 @@ static int dlm_do_assert_master(struct dlm_ctxt *dlm,
                                 void *nodemap, u32 flags);
 static void dlm_deref_lockres_worker(struct dlm_work_item *item, void *data);
 
-static inline void __dlm_mle_name(struct dlm_master_list_entry *mle,
-                                  unsigned char **name, unsigned int *namelen,
-                                  unsigned int *namehash)
-{
-        BUG_ON(mle->type != DLM_MLE_BLOCK &&
-               mle->type != DLM_MLE_MASTER &&
-               mle->type != DLM_MLE_MIGRATION);
-
-        if (mle->type != DLM_MLE_MASTER) {
-                *name = mle->u.mlename.name;
-                *namelen = mle->u.mlename.len;
-                if (namehash)
-                        *namehash = mle->u.mlename.hash;
-        } else {
-                *name  = (unsigned char *)mle->u.mleres->lockname.name;
-                *namelen = mle->u.mleres->lockname.len;
-                if (namehash)
-                        *namehash = mle->u.mleres->lockname.hash;
-        }
-}
-
 static inline int dlm_mle_equal(struct dlm_ctxt *dlm,
                                 struct dlm_master_list_entry *mle,
                                 const char *name,
                                 unsigned int namelen)
 {
-        unsigned char *mlename;
-        unsigned int mlelen;
-
         if (dlm != mle->dlm)
                 return 0;
 
-        __dlm_mle_name(mle, &mlename, &mlelen, NULL);
-
-        if (namelen != mlelen || memcmp(name, mlename, namelen) != 0)
+        if (namelen != mle->mnamelen ||
+            memcmp(name, mle->mname, namelen) != 0)
                 return 0;
 
         return 1;
@@ -317,12 +292,16 @@ static void dlm_init_mle(struct dlm_master_list_entry *mle,
 
         if (mle->type == DLM_MLE_MASTER) {
                 BUG_ON(!res);
-                mle->u.mleres = res;
+                mle->mleres = res;
+                memcpy(mle->mname, res->lockname.name, res->lockname.len);
+                mle->mnamelen = res->lockname.len;
+                mle->mnamehash = res->lockname.hash;
         } else {
                 BUG_ON(!name);
-                memcpy(mle->u.mlename.name, name, namelen);
-                mle->u.mlename.len = namelen;
-                mle->u.mlename.hash = dlm_lockid_hash(name, namelen);
+                mle->mleres = NULL;
+                memcpy(mle->mname, name, namelen);
+                mle->mnamelen = namelen;
+                mle->mnamehash = dlm_lockid_hash(name, namelen);
         }
 
         atomic_inc(&dlm->mle_tot_count[mle->type]);
@@ -350,13 +329,10 @@ void __dlm_unlink_mle(struct dlm_ctxt *dlm, struct dlm_master_list_entry *mle)
 void __dlm_insert_mle(struct dlm_ctxt *dlm, struct dlm_master_list_entry *mle)
 {
         struct hlist_head *bucket;
-        unsigned char *mname;
-        unsigned int mlen, hash;
 
         assert_spin_locked(&dlm->master_lock);
 
-        __dlm_mle_name(mle, &mname, &mlen, &hash);
-        bucket = dlm_master_hash(dlm, hash);
+        bucket = dlm_master_hash(dlm, mle->mnamehash);
         hlist_add_head(&mle->master_hash_node, bucket);
 }
 
@@ -450,8 +426,6 @@ static void dlm_mle_release(struct kref *kref)
 {
         struct dlm_master_list_entry *mle;
         struct dlm_ctxt *dlm;
-        unsigned char *mname;
-        unsigned int mlen;
 
         mlog_entry_void();
 
@@ -461,8 +435,8 @@ static void dlm_mle_release(struct kref *kref)
         assert_spin_locked(&dlm->spinlock);
         assert_spin_locked(&dlm->master_lock);
 
-        __dlm_mle_name(mle, &mname, &mlen, NULL);
-        mlog(0, "Releasing mle for %.*s, type %d\n", mlen, mname, mle->type);
+        mlog(0, "Releasing mle for %.*s, type %d\n", mle->mnamelen, mle->mname,
+             mle->type);
 
         /* remove from list if not already */
         __dlm_unlink_mle(dlm, mle);
@@ -1284,7 +1258,7 @@ static int dlm_restart_lock_mastery(struct dlm_ctxt *dlm,
                                                      res->lockname.len,
                                                      res->lockname.name);
                                                 mle->type = DLM_MLE_MASTER;
-                                                mle->u.mleres = res;
+                                                mle->mleres = res;
                                         }
                                 }
                         }
@@ -1323,18 +1297,14 @@ static int dlm_do_master_request(struct dlm_lock_resource *res,
         struct dlm_ctxt *dlm = mle->dlm;
         struct dlm_master_request request;
         int ret, response=0, resend;
-        unsigned char *mlename;
-        unsigned int mlenamelen;
 
         memset(&request, 0, sizeof(request));
         request.node_idx = dlm->node_num;
 
         BUG_ON(mle->type == DLM_MLE_MIGRATION);
 
-        __dlm_mle_name(mle, &mlename, &mlenamelen, NULL);
-
-        request.namelen = (u8)mlenamelen;
-        memcpy(request.name, mlename, request.namelen);
+        request.namelen = (u8)mle->mnamelen;
+        memcpy(request.name, mle->mname, request.namelen);
 
 again:
         ret = o2net_send_message(DLM_MASTER_REQUEST_MSG, dlm->key, &request,
@@ -3203,12 +3173,10 @@ static struct dlm_lock_resource *dlm_reset_mleres_owner(struct dlm_ctxt *dlm,
                                         struct dlm_master_list_entry *mle)
 {
         struct dlm_lock_resource *res;
-        unsigned int hash;
 
         /* Find the lockres associated to the mle and set its owner to UNK */
-        hash = dlm_lockid_hash(mle->u.mlename.name, mle->u.mlename.len);
-        res = __dlm_lookup_lockres(dlm, mle->u.mlename.name, mle->u.mlename.len,
-                                   hash);
+        res = __dlm_lookup_lockres(dlm, mle->mname, mle->mnamelen,
+                                   mle->mnamehash);
         if (res) {
                 spin_unlock(&dlm->master_lock);