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-rw-r--r--fs/xfs/xfs_pwork.h59
1 files changed, 59 insertions, 0 deletions
diff --git a/fs/xfs/xfs_pwork.h b/fs/xfs/xfs_pwork.h
new file mode 100644
index 000000000..c0ef81fc8
--- /dev/null
+++ b/fs/xfs/xfs_pwork.h
@@ -0,0 +1,59 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Copyright (C) 2019 Oracle. All Rights Reserved.
+ * Author: Darrick J. Wong <darrick.wong@oracle.com>
+ */
+#ifndef __XFS_PWORK_H__
+#define __XFS_PWORK_H__
+
+struct xfs_pwork;
+struct xfs_mount;
+
+typedef int (*xfs_pwork_work_fn)(struct xfs_mount *mp, struct xfs_pwork *pwork);
+
+/*
+ * Parallel work coordination structure.
+ */
+struct xfs_pwork_ctl {
+ struct workqueue_struct *wq;
+ struct xfs_mount *mp;
+ xfs_pwork_work_fn work_fn;
+ struct wait_queue_head poll_wait;
+ atomic_t nr_work;
+ int error;
+};
+
+/*
+ * Embed this parallel work control item inside your own work structure,
+ * then queue work with it.
+ */
+struct xfs_pwork {
+ struct work_struct work;
+ struct xfs_pwork_ctl *pctl;
+};
+
+#define XFS_PWORK_SINGLE_THREADED { .pctl = NULL }
+
+/* Have we been told to abort? */
+static inline bool
+xfs_pwork_ctl_want_abort(
+ struct xfs_pwork_ctl *pctl)
+{
+ return pctl && pctl->error;
+}
+
+/* Have we been told to abort? */
+static inline bool
+xfs_pwork_want_abort(
+ struct xfs_pwork *pwork)
+{
+ return xfs_pwork_ctl_want_abort(pwork->pctl);
+}
+
+int xfs_pwork_init(struct xfs_mount *mp, struct xfs_pwork_ctl *pctl,
+ xfs_pwork_work_fn work_fn, const char *tag);
+void xfs_pwork_queue(struct xfs_pwork_ctl *pctl, struct xfs_pwork *pwork);
+int xfs_pwork_destroy(struct xfs_pwork_ctl *pctl);
+void xfs_pwork_poll(struct xfs_pwork_ctl *pctl);
+
+#endif /* __XFS_PWORK_H__ */