dlm: eliminate astparam type casting

Put lkb_astparam in a union with a dlm_user_args pointer to
eliminate a lot of type casting.

Signed-off-by: David Teigland <teigland@redhat.com>

6 files changed, 18 insertions, 22 deletions

diff --git a/fs/dlm/debug_fs.c b/fs/dlm/debug_fs.c
index 12c3bfd5e660..52b11960a175 100644
--- a/fs/dlm/debug_fs.c
+++ b/fs/dlm/debug_fs.c
@@ -162,14 +162,12 @@ static int print_resource(struct dlm_rsb *res, struct seq_file *s)
 
 static void print_lock(struct seq_file *s, struct dlm_lkb *lkb, struct dlm_rsb *r)
 {
-        struct dlm_user_args *ua;
         unsigned int waiting = 0;
         uint64_t xid = 0;
 
         if (lkb->lkb_flags & DLM_IFL_USER) {
-                ua = (struct dlm_user_args *) lkb->lkb_astparam;
-                if (ua)
-                        xid = ua->xid;
+                if (lkb->lkb_ua)
+                        xid = lkb->lkb_ua->xid;
         }
 
         if (lkb->lkb_timestamp)
diff --git a/fs/dlm/dlm_internal.h b/fs/dlm/dlm_internal.h
index a53c237f310c..d30ea8b433a2 100644
--- a/fs/dlm/dlm_internal.h
+++ b/fs/dlm/dlm_internal.h
@@ -253,7 +253,10 @@ struct dlm_lkb {
         struct dlm_lksb         *lkb_lksb;      /* caller's status block */
         void                    (*lkb_astfn) (void *astparam);
         void                    (*lkb_bastfn) (void *astparam, int mode);
-        void                    *lkb_astparam;  /* caller's ast arg */
+        union {
+                void                    *lkb_astparam;  /* caller's ast arg */
+                struct dlm_user_args    *lkb_ua;
+        };
 };
 
 
diff --git a/fs/dlm/lock.c b/fs/dlm/lock.c
index 94f8cbd3c0be..8f250ac8b928 100644
--- a/fs/dlm/lock.c
+++ b/fs/dlm/lock.c
@@ -4533,7 +4533,7 @@ int dlm_user_convert(struct dlm_ls *ls, struct dlm_user_args *ua_tmp,
         /* user can change the params on its lock when it converts it, or
            add an lvb that didn't exist before */
 
-        ua = (struct dlm_user_args *)lkb->lkb_astparam;
+        ua = lkb->lkb_ua;
 
         if (flags & DLM_LKF_VALBLK && !ua->lksb.sb_lvbptr) {
                 ua->lksb.sb_lvbptr = kzalloc(DLM_USER_LVB_LEN, GFP_KERNEL);
@@ -4584,7 +4584,7 @@ int dlm_user_unlock(struct dlm_ls *ls, struct dlm_user_args *ua_tmp,
         if (error)
                 goto out;
 
-        ua = (struct dlm_user_args *)lkb->lkb_astparam;
+        ua = lkb->lkb_ua;
 
         if (lvb_in && ua->lksb.sb_lvbptr)
                 memcpy(ua->lksb.sb_lvbptr, lvb_in, DLM_USER_LVB_LEN);
@@ -4633,7 +4633,7 @@ int dlm_user_cancel(struct dlm_ls *ls, struct dlm_user_args *ua_tmp,
         if (error)
                 goto out;
 
-        ua = (struct dlm_user_args *)lkb->lkb_astparam;
+        ua = lkb->lkb_ua;
         if (ua_tmp->castparam)
                 ua->castparam = ua_tmp->castparam;
         ua->user_lksb = ua_tmp->user_lksb;
@@ -4671,7 +4671,7 @@ int dlm_user_deadlock(struct dlm_ls *ls, uint32_t flags, uint32_t lkid)
         if (error)
                 goto out;
 
-        ua = (struct dlm_user_args *)lkb->lkb_astparam;
+        ua = lkb->lkb_ua;
 
         error = set_unlock_args(flags, ua, &args);
         if (error)
@@ -4710,7 +4710,6 @@ int dlm_user_deadlock(struct dlm_ls *ls, uint32_t flags, uint32_t lkid)
 
 static int orphan_proc_lock(struct dlm_ls *ls, struct dlm_lkb *lkb)
 {
-        struct dlm_user_args *ua = (struct dlm_user_args *)lkb->lkb_astparam;
         struct dlm_args args;
         int error;
 
@@ -4719,7 +4718,7 @@ static int orphan_proc_lock(struct dlm_ls *ls, struct dlm_lkb *lkb)
         list_add_tail(&lkb->lkb_ownqueue, &ls->ls_orphans);
         mutex_unlock(&ls->ls_orphans_mutex);
 
-        set_unlock_args(0, ua, &args);
+        set_unlock_args(0, lkb->lkb_ua, &args);
 
         error = cancel_lock(ls, lkb, &args);
         if (error == -DLM_ECANCEL)
@@ -4732,11 +4731,10 @@ static int orphan_proc_lock(struct dlm_ls *ls, struct dlm_lkb *lkb)
 
 static int unlock_proc_lock(struct dlm_ls *ls, struct dlm_lkb *lkb)
 {
-        struct dlm_user_args *ua = (struct dlm_user_args *)lkb->lkb_astparam;
         struct dlm_args args;
         int error;
 
-        set_unlock_args(DLM_LKF_FORCEUNLOCK, ua, &args);
+        set_unlock_args(DLM_LKF_FORCEUNLOCK, lkb->lkb_ua, &args);
 
         error = unlock_lock(ls, lkb, &args);
         if (error == -DLM_EUNLOCK)
diff --git a/fs/dlm/memory.c b/fs/dlm/memory.c
index f7783867491a..65e41e5569b0 100644
--- a/fs/dlm/memory.c
+++ b/fs/dlm/memory.c
@@ -80,7 +80,7 @@ void dlm_free_lkb(struct dlm_lkb *lkb)
 {
         if (lkb->lkb_flags & DLM_IFL_USER) {
                 struct dlm_user_args *ua;
-                ua = (struct dlm_user_args *)lkb->lkb_astparam;
+                ua = lkb->lkb_ua;
                 if (ua) {
                         if (ua->lksb.sb_lvbptr)
                                 kfree(ua->lksb.sb_lvbptr);
diff --git a/fs/dlm/netlink.c b/fs/dlm/netlink.c
index 863b87d0dc71..90374b848761 100644
--- a/fs/dlm/netlink.c
+++ b/fs/dlm/netlink.c
@@ -104,7 +104,6 @@ void dlm_netlink_exit(void)
 static void fill_data(struct dlm_lock_data *data, struct dlm_lkb *lkb)
 {
         struct dlm_rsb *r = lkb->lkb_resource;
-        struct dlm_user_args *ua = (struct dlm_user_args *) lkb->lkb_astparam;
 
         memset(data, 0, sizeof(struct dlm_lock_data));
 
@@ -117,8 +116,8 @@ static void fill_data(struct dlm_lock_data *data, struct dlm_lkb *lkb)
         data->grmode = lkb->lkb_grmode;
         data->rqmode = lkb->lkb_rqmode;
         data->timestamp = lkb->lkb_timestamp;
-        if (ua)
-                data->xid = ua->xid;
+        if (lkb->lkb_ua)
+                data->xid = lkb->lkb_ua->xid;
         if (r) {
                 data->lockspace_id = r->res_ls->ls_global_id;
                 data->resource_namelen = r->res_length;
diff --git a/fs/dlm/user.c b/fs/dlm/user.c
index c3060458b68e..70b31b914870 100644
--- a/fs/dlm/user.c
+++ b/fs/dlm/user.c
@@ -195,8 +195,8 @@ void dlm_user_add_ast(struct dlm_lkb *lkb, int type)
         if (lkb->lkb_flags & (DLM_IFL_ORPHAN | DLM_IFL_DEAD))
                 goto out;
 
-        DLM_ASSERT(lkb->lkb_astparam, dlm_print_lkb(lkb););
-        ua = (struct dlm_user_args *)lkb->lkb_astparam;
+        DLM_ASSERT(lkb->lkb_ua, dlm_print_lkb(lkb););
+        ua = lkb->lkb_ua;
         proc = ua->proc;
 
         if (type == AST_BAST && ua->bastaddr == NULL)
@@ -771,7 +771,6 @@ static ssize_t device_read(struct file *file, char __user *buf, size_t count,
 {
         struct dlm_user_proc *proc = file->private_data;
         struct dlm_lkb *lkb;
-        struct dlm_user_args *ua;
         DECLARE_WAITQUEUE(wait, current);
         int error, type=0, bmode=0, removed = 0;
 
@@ -842,8 +841,7 @@ static ssize_t device_read(struct file *file, char __user *buf, size_t count,
         }
         spin_unlock(&proc->asts_spin);
 
-        ua = (struct dlm_user_args *)lkb->lkb_astparam;
-        error = copy_result_to_user(ua,
+        error = copy_result_to_user(lkb->lkb_ua,
                                 test_bit(DLM_PROC_FLAGS_COMPAT, &proc->flags),
                                 type, bmode, buf, count);