net: Avoid extra wakeups of threads blocked in wait_for_packet()

[safe/jmp/linux-2.6] / include / linux / device-mapper.h

diff --git a/include/linux/device-mapper.h b/include/linux/device-mapper.h
index a68829e..ded2d7c 100644 (file)
--- a/include/linux/device-mapper.h
+++ b/include/linux/device-mapper.h
@@ -8,14 +8,13 @@
 #ifndef _LINUX_DEVICE_MAPPER_H
 #define _LINUX_DEVICE_MAPPER_H
 
-#ifdef __KERNEL__
-
 #include <linux/bio.h>
+#include <linux/blkdev.h>
 
 struct dm_target;
 struct dm_table;
-struct dm_dev;
 struct mapped_device;
+struct bio_vec;
 
 typedef enum { STATUSTYPE_INFO, STATUSTYPE_TABLE } status_type_t;
 
@@ -46,6 +45,8 @@ typedef void (*dm_dtr_fn) (struct dm_target *ti);
  */
 typedef int (*dm_map_fn) (struct dm_target *ti, struct bio *bio,
                          union map_info *map_context);
+typedef int (*dm_map_request_fn) (struct dm_target *ti, struct request *clone,
+                                 union map_info *map_context);
 
 /*
  * Returns:
@@ -58,6 +59,9 @@ typedef int (*dm_map_fn) (struct dm_target *ti, struct bio *bio,
 typedef int (*dm_endio_fn) (struct dm_target *ti,
                            struct bio *bio, int error,
                            union map_info *map_context);
+typedef int (*dm_request_endio_fn) (struct dm_target *ti,
+                                   struct request *clone, int error,
+                                   union map_info *map_context);
 
 typedef void (*dm_flush_fn) (struct dm_target *ti);
 typedef void (*dm_presuspend_fn) (struct dm_target *ti);
@@ -70,10 +74,19 @@ typedef int (*dm_status_fn) (struct dm_target *ti, status_type_t status_type,
 
 typedef int (*dm_message_fn) (struct dm_target *ti, unsigned argc, char **argv);
 
-typedef int (*dm_ioctl_fn) (struct dm_target *ti, struct inode *inode,
-                           struct file *filp, unsigned int cmd,
+typedef int (*dm_ioctl_fn) (struct dm_target *ti, unsigned int cmd,
                            unsigned long arg);
 
+typedef int (*dm_merge_fn) (struct dm_target *ti, struct bvec_merge_data *bvm,
+                           struct bio_vec *biovec, int max_size);
+
+/*
+ * Returns:
+ *    0: The target can handle the next I/O immediately.
+ *    1: The target can't handle the next I/O immediately.
+ */
+typedef int (*dm_busy_fn) (struct dm_target *ti);
+
 void dm_error(const char *message);
 
 /*
@@ -81,26 +94,40 @@ void dm_error(const char *message);
  */
 void dm_set_device_limits(struct dm_target *ti, struct block_device *bdev);
 
+struct dm_dev {
+       struct block_device *bdev;
+       fmode_t mode;
+       char name[16];
+};
+
 /*
  * Constructors should call these functions to ensure destination devices
  * are opened/closed correctly.
  * FIXME: too many arguments.
  */
 int dm_get_device(struct dm_target *ti, const char *path, sector_t start,
-                 sector_t len, int mode, struct dm_dev **result);
+                 sector_t len, fmode_t mode, struct dm_dev **result);
 void dm_put_device(struct dm_target *ti, struct dm_dev *d);
 
 /*
  * Information about a target type
  */
+
+/*
+ * Target features
+ */
+
 struct target_type {
+       uint64_t features;
        const char *name;
        struct module *module;
        unsigned version[3];
        dm_ctr_fn ctr;
        dm_dtr_fn dtr;
        dm_map_fn map;
+       dm_map_request_fn map_rq;
        dm_endio_fn end_io;
+       dm_request_endio_fn rq_end_io;
        dm_flush_fn flush;
        dm_presuspend_fn presuspend;
        dm_postsuspend_fn postsuspend;
@@ -109,6 +136,11 @@ struct target_type {
        dm_status_fn status;
        dm_message_fn message;
        dm_ioctl_fn ioctl;
+       dm_merge_fn merge;
+       dm_busy_fn busy;
+
+       /* For internal device-mapper use. */
+       struct list_head list;
 };
 
 struct io_restrictions {
@@ -149,8 +181,7 @@ struct dm_target {
 };
 
 int dm_register_target(struct target_type *t);
-int dm_unregister_target(struct target_type *t);
-
+void dm_unregister_target(struct target_type *t);
 
 /*-----------------------------------------------------------------
  * Functions for creating and manipulating mapped devices.
@@ -198,6 +229,7 @@ int dm_copy_name_and_uuid(struct mapped_device *md, char *name, char *uuid);
 struct gendisk *dm_disk(struct mapped_device *md);
 int dm_suspended(struct mapped_device *md);
 int dm_noflush_suspending(struct dm_target *ti);
+union map_info *dm_get_mapinfo(struct bio *bio);
 
 /*
  * Geometry functions.
@@ -213,7 +245,7 @@ int dm_set_geometry(struct mapped_device *md, struct hd_geometry *geo);
 /*
  * First create an empty table.
  */
-int dm_table_create(struct dm_table **result, int mode,
+int dm_table_create(struct dm_table **result, fmode_t mode,
                    unsigned num_targets, struct mapped_device *md);
 
 /*
@@ -228,6 +260,11 @@ int dm_table_add_target(struct dm_table *t, const char *type,
 int dm_table_complete(struct dm_table *t);
 
 /*
+ * Unplug all devices in a table.
+ */
+void dm_table_unplug_all(struct dm_table *t);
+
+/*
  * Table reference counting.
  */
 struct dm_table *dm_get_table(struct mapped_device *md);
@@ -239,7 +276,7 @@ void dm_table_put(struct dm_table *t);
  */
 sector_t dm_table_get_size(struct dm_table *t);
 unsigned int dm_table_get_num_targets(struct dm_table *t);
-int dm_table_get_mode(struct dm_table *t);
+fmode_t dm_table_get_mode(struct dm_table *t);
 struct mapped_device *dm_table_get_md(struct dm_table *t);
 
 /*
@@ -253,16 +290,18 @@ void dm_table_event(struct dm_table *t);
 int dm_swap_table(struct mapped_device *md, struct dm_table *t);
 
 /*
- * Prepare a table for a device that will error all I/O.
- * To make it active, call dm_suspend(), dm_swap_table() then dm_resume().
+ * A wrapper around vmalloc.
  */
-int dm_create_error_table(struct dm_table **result, struct mapped_device *md);
+void *dm_vcalloc(unsigned long nmemb, unsigned long elem_size);
 
 /*-----------------------------------------------------------------
  * Macros.
  *---------------------------------------------------------------*/
 #define DM_NAME "device-mapper"
 
+#define DMCRIT(f, arg...) \
+       printk(KERN_CRIT DM_NAME ": " DM_MSG_PREFIX ": " f "\n", ## arg)
+
 #define DMERR(f, arg...) \
        printk(KERN_ERR DM_NAME ": " DM_MSG_PREFIX ": " f "\n", ## arg)
 #define DMERR_LIMIT(f, arg...) \
@@ -340,6 +379,9 @@ int dm_create_error_table(struct dm_table **result, struct mapped_device *md);
  */
 #define dm_round_up(n, sz) (dm_div_up((n), (sz)) * (sz))
 
+#define dm_array_too_big(fixed, obj, num) \
+       ((num) > (UINT_MAX - (fixed)) / (obj))
+
 static inline sector_t to_sector(unsigned long n)
 {
        return (n >> SECTOR_SHIFT);
@@ -350,5 +392,4 @@ static inline unsigned long to_bytes(sector_t n)
        return (n << SECTOR_SHIFT);
 }
 
-#endif /* __KERNEL__ */
 #endif /* _LINUX_DEVICE_MAPPER_H */