dlm: convert to using new filelock helpers

Convert to using the new file locking helper functions. Also, in later
patches we're going to introduce some temporary macros with names that
clash with the variable name in dlm_posix_unlock. Rename it.
Signed-off-by: Jeff Layton <jlayton@kernel.org>
Link: https://lore.kernel.org/r/20240131-flsplit-v3-8-c6129007ee8d@kernel.orgReviewed-by: NeilBrown <neilb@suse.de>
Signed-off-by: Christian Brauner <brauner@kernel.org>

fs/dlm/plock.c

@@ -139,7 +139,7 @@ int dlm_posix_lock(dlm_lockspace_t *lockspace, u64 number, struct file *file,
 
 	op->info.optype		= DLM_PLOCK_OP_LOCK;
 	op->info.pid		= fl->fl_pid;
-	op->info.ex		= (fl->fl_type == F_WRLCK);
+	op->info.ex		= (lock_is_write(fl));
 	op->info.wait		= !!(fl->fl_flags & FL_SLEEP);
 	op->info.fsid		= ls->ls_global_id;
 	op->info.number		= number;
@@ -291,7 +291,7 @@ int dlm_posix_unlock(dlm_lockspace_t *lockspace, u64 number, struct file *file,
 	struct dlm_ls *ls;
 	struct plock_op *op;
 	int rv;
-	unsigned char fl_flags = fl->fl_flags;
+	unsigned char saved_flags = fl->fl_flags;
 
 	ls = dlm_find_lockspace_local(lockspace);
 	if (!ls)
@@ -345,7 +345,7 @@ int dlm_posix_unlock(dlm_lockspace_t *lockspace, u64 number, struct file *file,
 	dlm_release_plock_op(op);
 out:
 	dlm_put_lockspace(ls);
-	fl->fl_flags = fl_flags;
+	fl->fl_flags = saved_flags;
 	return rv;
 }
 EXPORT_SYMBOL_GPL(dlm_posix_unlock);
@@ -376,7 +376,7 @@ int dlm_posix_cancel(dlm_lockspace_t *lockspace, u64 number, struct file *file,
 
 	memset(&info, 0, sizeof(info));
 	info.pid = fl->fl_pid;
-	info.ex = (fl->fl_type == F_WRLCK);
+	info.ex = (lock_is_write(fl));
 	info.fsid = ls->ls_global_id;
 	dlm_put_lockspace(ls);
 	info.number = number;
@@ -438,7 +438,7 @@ int dlm_posix_get(dlm_lockspace_t *lockspace, u64 number, struct file *file,
 
 	op->info.optype		= DLM_PLOCK_OP_GET;
 	op->info.pid		= fl->fl_pid;
-	op->info.ex		= (fl->fl_type == F_WRLCK);
+	op->info.ex		= (lock_is_write(fl));
 	op->info.fsid		= ls->ls_global_id;
 	op->info.number		= number;
 	op->info.start		= fl->fl_start;