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-rw-r--r--fs/io-wq.h74
1 files changed, 74 insertions, 0 deletions
diff --git a/fs/io-wq.h b/fs/io-wq.h
new file mode 100644
index 000000000000..4b29f922f80c
--- /dev/null
+++ b/fs/io-wq.h
@@ -0,0 +1,74 @@
+#ifndef INTERNAL_IO_WQ_H
+#define INTERNAL_IO_WQ_H
+
+struct io_wq;
+
+enum {
+ IO_WQ_WORK_CANCEL = 1,
+ IO_WQ_WORK_HAS_MM = 2,
+ IO_WQ_WORK_HASHED = 4,
+ IO_WQ_WORK_NEEDS_USER = 8,
+ IO_WQ_WORK_NEEDS_FILES = 16,
+ IO_WQ_WORK_UNBOUND = 32,
+ IO_WQ_WORK_INTERNAL = 64,
+
+ IO_WQ_HASH_SHIFT = 24, /* upper 8 bits are used for hash key */
+};
+
+enum io_wq_cancel {
+ IO_WQ_CANCEL_OK, /* cancelled before started */
+ IO_WQ_CANCEL_RUNNING, /* found, running, and attempted cancelled */
+ IO_WQ_CANCEL_NOTFOUND, /* work not found */
+};
+
+struct io_wq_work {
+ struct list_head list;
+ void (*func)(struct io_wq_work **);
+ unsigned flags;
+ struct files_struct *files;
+};
+
+#define INIT_IO_WORK(work, _func) \
+ do { \
+ (work)->func = _func; \
+ (work)->flags = 0; \
+ (work)->files = NULL; \
+ } while (0) \
+
+typedef void (get_work_fn)(struct io_wq_work *);
+typedef void (put_work_fn)(struct io_wq_work *);
+
+struct io_wq *io_wq_create(unsigned bounded, struct mm_struct *mm,
+ struct user_struct *user,
+ get_work_fn *get_work, put_work_fn *put_work);
+void io_wq_destroy(struct io_wq *wq);
+
+void io_wq_enqueue(struct io_wq *wq, struct io_wq_work *work);
+void io_wq_enqueue_hashed(struct io_wq *wq, struct io_wq_work *work, void *val);
+void io_wq_flush(struct io_wq *wq);
+
+void io_wq_cancel_all(struct io_wq *wq);
+enum io_wq_cancel io_wq_cancel_work(struct io_wq *wq, struct io_wq_work *cwork);
+
+typedef bool (work_cancel_fn)(struct io_wq_work *, void *);
+
+enum io_wq_cancel io_wq_cancel_cb(struct io_wq *wq, work_cancel_fn *cancel,
+ void *data);
+
+#if defined(CONFIG_IO_WQ)
+extern void io_wq_worker_sleeping(struct task_struct *);
+extern void io_wq_worker_running(struct task_struct *);
+#else
+static inline void io_wq_worker_sleeping(struct task_struct *tsk)
+{
+}
+static inline void io_wq_worker_running(struct task_struct *tsk)
+{
+}
+#endif
+
+static inline bool io_wq_current_is_worker(void)
+{
+ return in_task() && (current->flags & PF_IO_WORKER);
+}
+#endif