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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /drivers/md/dm-hw-handler.h
downloadop-kernel-dev-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.zip
op-kernel-dev-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.gz
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'drivers/md/dm-hw-handler.h')
-rw-r--r--drivers/md/dm-hw-handler.h61
1 files changed, 61 insertions, 0 deletions
diff --git a/drivers/md/dm-hw-handler.h b/drivers/md/dm-hw-handler.h
new file mode 100644
index 0000000..15f5629
--- /dev/null
+++ b/drivers/md/dm-hw-handler.h
@@ -0,0 +1,61 @@
+/*
+ * Copyright (C) 2004 Red Hat, Inc. All rights reserved.
+ *
+ * This file is released under the GPL.
+ *
+ * Multipath hardware handler registration.
+ */
+
+#ifndef DM_HW_HANDLER_H
+#define DM_HW_HANDLER_H
+
+#include <linux/device-mapper.h>
+
+#include "dm-mpath.h"
+
+struct hw_handler_type;
+struct hw_handler {
+ struct hw_handler_type *type;
+ void *context;
+};
+
+/*
+ * Constructs a hardware handler object, takes custom arguments
+ */
+/* Information about a hardware handler type */
+struct hw_handler_type {
+ char *name;
+ struct module *module;
+
+ int (*create) (struct hw_handler *handler, unsigned int argc,
+ char **argv);
+ void (*destroy) (struct hw_handler *hwh);
+
+ void (*pg_init) (struct hw_handler *hwh, unsigned bypassed,
+ struct path *path);
+ unsigned (*error) (struct hw_handler *hwh, struct bio *bio);
+ int (*status) (struct hw_handler *hwh, status_type_t type,
+ char *result, unsigned int maxlen);
+};
+
+/* Register a hardware handler */
+int dm_register_hw_handler(struct hw_handler_type *type);
+
+/* Unregister a hardware handler */
+int dm_unregister_hw_handler(struct hw_handler_type *type);
+
+/* Returns a registered hardware handler type */
+struct hw_handler_type *dm_get_hw_handler(const char *name);
+
+/* Releases a hardware handler */
+void dm_put_hw_handler(struct hw_handler_type *hwht);
+
+/* Default err function */
+unsigned dm_scsi_err_handler(struct hw_handler *hwh, struct bio *bio);
+
+/* Error flags for err and dm_pg_init_complete */
+#define MP_FAIL_PATH 1
+#define MP_BYPASS_PG 2
+#define MP_ERROR_IO 4 /* Don't retry this I/O */
+
+#endif
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