1 files changed, 250 insertions, 0 deletions
diff --git a/drivers/md/dm.h b/drivers/md/dm.h
new file mode 100644
index 0000000000..f682295af9
--- /dev/null
+++ b/drivers/md/dm.h
@@ -0,0 +1,250 @@
+/*
+ * Internal header file for device mapper
+ *
+ * Copyright (C) 2001, 2002 Sistina Software
+ * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
+ *
+ * This file is released under the LGPL.
+ */
+
+#ifndef DM_INTERNAL_H
+#define DM_INTERNAL_H
+
+#include <linux/fs.h>
+#include <linux/device-mapper.h>
+#include <linux/list.h>
+#include <linux/moduleparam.h>
+#include <linux/blkdev.h>
+#include <linux/backing-dev.h>
+#include <linux/hdreg.h>
+#include <linux/completion.h>
+#include <linux/kobject.h>
+#include <linux/refcount.h>
+#include <linux/log2.h>
+
+#include "dm-stats.h"
+
+/*
+ * Suspend feature flags
+ */
+#define DM_SUSPEND_LOCKFS_FLAG		(1 << 0)
+#define DM_SUSPEND_NOFLUSH_FLAG		(1 << 1)
+
+/*
+ * Status feature flags
+ */
+#define DM_STATUS_NOFLUSH_FLAG		(1 << 0)
+
+/*
+ * List of devices that a metadevice uses and should open/close.
+ */
+struct dm_dev_internal {
+	struct list_head list;
+	refcount_t count;
+	struct dm_dev *dm_dev;
+};
+
+struct dm_table;
+struct dm_md_mempools;
+struct dm_target_io;
+struct dm_io;
+
+/*
+ *---------------------------------------------------------------
+ * Internal table functions.
+ *---------------------------------------------------------------
+ */
+void dm_table_event_callback(struct dm_table *t,
+			     void (*fn)(void *), void *context);
+struct dm_target *dm_table_find_target(struct dm_table *t, sector_t sector);
+bool dm_table_has_no_data_devices(struct dm_table *table);
+int dm_calculate_queue_limits(struct dm_table *table,
+			      struct queue_limits *limits);
+int dm_table_set_restrictions(struct dm_table *t, struct request_queue *q,
+			      struct queue_limits *limits);
+struct list_head *dm_table_get_devices(struct dm_table *t);
+void dm_table_presuspend_targets(struct dm_table *t);
+void dm_table_presuspend_undo_targets(struct dm_table *t);
+void dm_table_postsuspend_targets(struct dm_table *t);
+int dm_table_resume_targets(struct dm_table *t);
+enum dm_queue_mode dm_table_get_type(struct dm_table *t);
+struct target_type *dm_table_get_immutable_target_type(struct dm_table *t);
+struct dm_target *dm_table_get_immutable_target(struct dm_table *t);
+struct dm_target *dm_table_get_wildcard_target(struct dm_table *t);
+bool dm_table_bio_based(struct dm_table *t);
+bool dm_table_request_based(struct dm_table *t);
+
+void dm_lock_md_type(struct mapped_device *md);
+void dm_unlock_md_type(struct mapped_device *md);
+void dm_set_md_type(struct mapped_device *md, enum dm_queue_mode type);
+enum dm_queue_mode dm_get_md_type(struct mapped_device *md);
+struct target_type *dm_get_immutable_target_type(struct mapped_device *md);
+
+int dm_setup_md_queue(struct mapped_device *md, struct dm_table *t);
+
+/*
+ * To check whether the target type is bio-based or not (request-based).
+ */
+#define dm_target_bio_based(t) ((t)->type->map != NULL)
+
+/*
+ * To check whether the target type is request-based or not (bio-based).
+ */
+#define dm_target_request_based(t) ((t)->type->clone_and_map_rq != NULL)
+
+/*
+ * To check whether the target type is a hybrid (capable of being
+ * either request-based or bio-based).
+ */
+#define dm_target_hybrid(t) (dm_target_bio_based(t) && dm_target_request_based(t))
+
+/*
+ * Zoned targets related functions.
+ */
+int dm_set_zones_restrictions(struct dm_table *t, struct request_queue *q);
+void dm_zone_endio(struct dm_io *io, struct bio *clone);
+#ifdef CONFIG_BLK_DEV_ZONED
+void dm_cleanup_zoned_dev(struct mapped_device *md);
+int dm_blk_report_zones(struct gendisk *disk, sector_t sector,
+			unsigned int nr_zones, report_zones_cb cb, void *data);
+bool dm_is_zone_write(struct mapped_device *md, struct bio *bio);
+int dm_zone_map_bio(struct dm_target_io *io);
+#else
+static inline void dm_cleanup_zoned_dev(struct mapped_device *md) {}
+#define dm_blk_report_zones	NULL
+static inline bool dm_is_zone_write(struct mapped_device *md, struct bio *bio)
+{
+	return false;
+}
+static inline int dm_zone_map_bio(struct dm_target_io *tio)
+{
+	return DM_MAPIO_KILL;
+}
+#endif
+
+/*
+ *---------------------------------------------------------------
+ * A registry of target types.
+ *---------------------------------------------------------------
+ */
+int dm_target_init(void);
+void dm_target_exit(void);
+struct target_type *dm_get_target_type(const char *name);
+void dm_put_target_type(struct target_type *tt);
+int dm_target_iterate(void (*iter_func)(struct target_type *tt,
+					void *param), void *param);
+
+int dm_split_args(int *argc, char ***argvp, char *input);
+
+/*
+ * Is this mapped_device being deleted?
+ */
+int dm_deleting_md(struct mapped_device *md);
+
+/*
+ * Is this mapped_device suspended?
+ */
+int dm_suspended_md(struct mapped_device *md);
+
+/*
+ * Internal suspend and resume methods.
+ */
+int dm_suspended_internally_md(struct mapped_device *md);
+void dm_internal_suspend_fast(struct mapped_device *md);
+void dm_internal_resume_fast(struct mapped_device *md);
+void dm_internal_suspend_noflush(struct mapped_device *md);
+void dm_internal_resume(struct mapped_device *md);
+
+/*
+ * Test if the device is scheduled for deferred remove.
+ */
+int dm_test_deferred_remove_flag(struct mapped_device *md);
+
+/*
+ * Try to remove devices marked for deferred removal.
+ */
+void dm_deferred_remove(void);
+
+/*
+ * The device-mapper can be driven through one of two interfaces;
+ * ioctl or filesystem, depending which patch you have applied.
+ */
+int dm_interface_init(void);
+void dm_interface_exit(void);
+
+/*
+ * sysfs interface
+ */
+int dm_sysfs_init(struct mapped_device *md);
+void dm_sysfs_exit(struct mapped_device *md);
+struct kobject *dm_kobject(struct mapped_device *md);
+struct mapped_device *dm_get_from_kobject(struct kobject *kobj);
+
+/*
+ * The kobject helper
+ */
+void dm_kobject_release(struct kobject *kobj);
+
+/*
+ * Targets for linear and striped mappings
+ */
+int dm_linear_init(void);
+void dm_linear_exit(void);
+
+int dm_stripe_init(void);
+void dm_stripe_exit(void);
+
+/*
+ * mapped_device operations
+ */
+void dm_destroy(struct mapped_device *md);
+void dm_destroy_immediate(struct mapped_device *md);
+int dm_open_count(struct mapped_device *md);
+int dm_lock_for_deletion(struct mapped_device *md, bool mark_deferred, bool only_deferred);
+int dm_cancel_deferred_remove(struct mapped_device *md);
+int dm_request_based(struct mapped_device *md);
+int dm_get_table_device(struct mapped_device *md, dev_t dev, blk_mode_t mode,
+			struct dm_dev **result);
+void dm_put_table_device(struct mapped_device *md, struct dm_dev *d);
+
+int dm_kobject_uevent(struct mapped_device *md, enum kobject_action action,
+		      unsigned int cookie, bool need_resize_uevent);
+
+int dm_io_init(void);
+void dm_io_exit(void);
+
+int dm_kcopyd_init(void);
+void dm_kcopyd_exit(void);
+
+/*
+ * Mempool operations
+ */
+void dm_free_md_mempools(struct dm_md_mempools *pools);
+
+/*
+ * Various helpers
+ */
+unsigned int dm_get_reserved_bio_based_ios(void);
+
+#define DM_HASH_LOCKS_MAX 64
+
+static inline unsigned int dm_num_hash_locks(void)
+{
+	unsigned int num_locks = roundup_pow_of_two(num_online_cpus()) << 1;
+
+	return min_t(unsigned int, num_locks, DM_HASH_LOCKS_MAX);
+}
+
+#define DM_HASH_LOCKS_MULT  4294967291ULL
+#define DM_HASH_LOCKS_SHIFT 6
+
+static inline unsigned int dm_hash_locks_index(sector_t block,
+					       unsigned int num_locks)
+{
+	sector_t h1 = (block * DM_HASH_LOCKS_MULT) >> DM_HASH_LOCKS_SHIFT;
+	sector_t h2 = h1 >> DM_HASH_LOCKS_SHIFT;
+
+	return (h1 ^ h2) & (num_locks - 1);
+}
+
+#endif