Merge git://git.kernel.org/pub/scm/linux/kernel/git/agk/linux-2.6-dm

* git://git.kernel.org/pub/scm/linux/kernel/git/agk/linux-2.6-dm: (33 commits)
  dm mpath: support discard
  dm stripe: support discards
  dm: split discard requests on target boundaries
  dm stripe: optimize sector division
  dm stripe: move sector translation to a function
  dm: error return error for discards
  dm delay: support discard
  dm: zero silently drop discards
  dm: use dm_target_offset macro
  dm: factor out max_io_len_target_boundary
  dm: use common __issue_target_request for flush and discard support
  dm: linear support discard
  dm crypt: simplify crypt_ctr
  dm crypt: simplify crypt_config destruction logic
  dm: allow autoloading of dm mod
  dm: rename map_info flush_request to target_request_nr
  dm ioctl: refactor dm_table_complete
  dm snapshot: implement merge
  dm: do not initialise full request queue when bio based
  dm ioctl: make bio or request based device type immutable
  ...

3 files changed, 18 insertions, 4 deletions

diff --git a/include/linux/device-mapper.h b/include/linux/device-mapper.h
index 1381cd97b4ed..2970022faa63 100644
--- a/include/linux/device-mapper.h
+++ b/include/linux/device-mapper.h
@@ -22,7 +22,7 @@ typedef enum { STATUSTYPE_INFO, STATUSTYPE_TABLE } status_type_t;
 union map_info {
         void *ptr;
         unsigned long long ll;
-        unsigned flush_request;
+        unsigned target_request_nr;
 };
 
 /*
@@ -174,12 +174,18 @@ struct dm_target {
          * A number of zero-length barrier requests that will be submitted
          * to the target for the purpose of flushing cache.
          *
-         * The request number will be placed in union map_info->flush_request.
+         * The request number will be placed in union map_info->target_request_nr.
          * It is a responsibility of the target driver to remap these requests
          * to the real underlying devices.
          */
         unsigned num_flush_requests;
 
+        /*
+         * The number of discard requests that will be submitted to the
+         * target.  map_info->request_nr is used just like num_flush_requests.
+         */
+        unsigned num_discard_requests;
+
         /* target specific data */
         void *private;
 
@@ -392,6 +398,12 @@ void *dm_vcalloc(unsigned long nmemb, unsigned long elem_size);
 #define dm_array_too_big(fixed, obj, num) \
         ((num) > (UINT_MAX - (fixed)) / (obj))
 
+/*
+ * Sector offset taken relative to the start of the target instead of
+ * relative to the start of the device.
+ */
+#define dm_target_offset(ti, sector) ((sector) - (ti)->begin)
+
 static inline sector_t to_sector(unsigned long n)
 {
         return (n >> SECTOR_SHIFT);
diff --git a/include/linux/dm-ioctl.h b/include/linux/dm-ioctl.h
index 2c445e113790..49eab360d5d4 100644
--- a/include/linux/dm-ioctl.h
+++ b/include/linux/dm-ioctl.h
@@ -11,6 +11,7 @@
 #include <linux/types.h>
 
 #define DM_DIR "mapper"         /* Slashes not supported */
+#define DM_CONTROL_NODE "control"
 #define DM_MAX_TYPE_NAME 16
 #define DM_NAME_LEN 128
 #define DM_UUID_LEN 129
@@ -266,9 +267,9 @@ enum {
 #define DM_DEV_SET_GEOMETRY     _IOWR(DM_IOCTL, DM_DEV_SET_GEOMETRY_CMD, struct dm_ioctl)
 
 #define DM_VERSION_MAJOR        4
-#define DM_VERSION_MINOR        17
+#define DM_VERSION_MINOR        18
 #define DM_VERSION_PATCHLEVEL   0
-#define DM_VERSION_EXTRA        "-ioctl (2010-03-05)"
+#define DM_VERSION_EXTRA        "-ioctl (2010-06-29)"
 
 /* Status bits */
 #define DM_READONLY_FLAG        (1 << 0) /* In/Out */
diff --git a/include/linux/miscdevice.h b/include/linux/miscdevice.h
index f6c9b7dcb9fd..bafffc737903 100644
--- a/include/linux/miscdevice.h
+++ b/include/linux/miscdevice.h
@@ -38,6 +38,7 @@
 #define KVM_MINOR               232
 #define BTRFS_MINOR             234
 #define AUTOFS_MINOR            235
+#define MAPPER_CTRL_MINOR       236
 #define MISC_DYNAMIC_MINOR      255
 
 struct device;