4 files changed, 70 insertions, 1 deletions

diff --git a/include/scsi/scsi.h b/include/scsi/scsi.h
index 27d4d9ea6c6d..baba3405b03d 100644
--- a/include/scsi/scsi.h
+++ b/include/scsi/scsi.h
@@ -41,6 +41,7 @@ extern const char *const scsi_device_types[MAX_SCSI_DEVICE_CODE];
 #define FORMAT_UNIT           0x04
 #define READ_BLOCK_LIMITS     0x05
 #define REASSIGN_BLOCKS       0x07
+#define INITIALIZE_ELEMENT_STATUS 0x07
 #define READ_6                0x08
 #define WRITE_6               0x0a
 #define SEEK_6                0x0b
@@ -65,6 +66,7 @@ extern const char *const scsi_device_types[MAX_SCSI_DEVICE_CODE];
 #define READ_10               0x28
 #define WRITE_10              0x2a
 #define SEEK_10               0x2b
+#define POSITION_TO_ELEMENT   0x2b
 #define WRITE_VERIFY          0x2e
 #define VERIFY                0x2f
 #define SEARCH_HIGH           0x30
@@ -97,6 +99,7 @@ extern const char *const scsi_device_types[MAX_SCSI_DEVICE_CODE];
 #define PERSISTENT_RESERVE_OUT 0x5f
 #define REPORT_LUNS           0xa0
 #define MOVE_MEDIUM           0xa5
+#define EXCHANGE_MEDIUM       0xa6
 #define READ_12               0xa8
 #define WRITE_12              0xaa
 #define WRITE_VERIFY_12       0xae
@@ -213,6 +216,7 @@ static inline int scsi_status_is_good(int status)
 #define TYPE_COMM           0x09    /* Communications device */
 #define TYPE_ENCLOSURE      0x0d    /* Enclosure Services Device */
 #define TYPE_RAID           0x0c
+#define TYPE_RBC            0x0e
 #define TYPE_NO_LUN         0x7f
 
 /*
diff --git a/include/scsi/scsi_device.h b/include/scsi/scsi_device.h
index c018020d9160..63c91dd85ca1 100644
--- a/include/scsi/scsi_device.h
+++ b/include/scsi/scsi_device.h
@@ -154,7 +154,9 @@ struct scsi_target {
         unsigned int            id; /* target id ... replace
                                      * scsi_device.id eventually */
         unsigned long           create:1; /* signal that it needs to be added */
-        unsigned long           starget_data[0];
+        void                    *hostdata; /* available to low-level driver */
+        unsigned long           starget_data[0]; /* for the transport */
+        /* starget_data must be the last element!!!! */
 } __attribute__((aligned(sizeof(unsigned long))));
 
 #define to_scsi_target(d)       container_of(d, struct scsi_target, dev)
diff --git a/include/scsi/scsi_host.h b/include/scsi/scsi_host.h
index 1cee1e100943..db9914adeac9 100644
--- a/include/scsi/scsi_host.h
+++ b/include/scsi/scsi_host.h
@@ -10,6 +10,7 @@ struct block_device;
 struct module;
 struct scsi_cmnd;
 struct scsi_device;
+struct scsi_target;
 struct Scsi_Host;
 struct scsi_host_cmd_pool;
 struct scsi_transport_template;
@@ -228,6 +229,30 @@ struct scsi_host_template {
         void (* slave_destroy)(struct scsi_device *);
 
         /*
+         * Before the mid layer attempts to scan for a new device attached
+         * to a target where no target currently exists, it will call this
+         * entry in your driver.  Should your driver need to allocate any
+         * structs or perform any other init items in order to send commands
+         * to a currently unused target, then this is where you can perform
+         * those allocations.
+         *
+         * Return values: 0 on success, non-0 on failure
+         *
+         * Status: OPTIONAL
+         */
+        int (* target_alloc)(struct scsi_target *);
+
+        /*
+         * Immediately prior to deallocating the target structure, and
+         * after all activity to attached scsi devices has ceased, the
+         * midlayer calls this point so that the driver may deallocate
+         * and terminate any references to the target.
+         *
+         * Status: OPTIONAL
+         */
+        void (* target_destroy)(struct scsi_target *);
+
+        /*
          * fill in this function to allow the queue depth of this host
          * to be changeable (on a per device basis).  returns either
          * the current queue depth setting (may be different from what
diff --git a/include/scsi/scsi_transport.h b/include/scsi/scsi_transport.h
index 2dcee7a84752..a4f1837a33b1 100644
--- a/include/scsi/scsi_transport.h
+++ b/include/scsi/scsi_transport.h
@@ -21,6 +21,7 @@
 #define SCSI_TRANSPORT_H
 
 #include <linux/transport_class.h>
+#include <scsi/scsi_host.h>
 
 struct scsi_transport_template {
         /* the attribute containers */
@@ -32,8 +33,11 @@ struct scsi_transport_template {
          * space of this size will be left at the end of the
          * scsi_* structure */
         int     device_size;
+        int     device_private_offset;
         int     target_size;
+        int     target_private_offset;
         int     host_size;
+        /* no private offset for the host; there's an alternative mechanism */
 
         /*
          * True if the transport wants to use a host-based work-queue
@@ -45,4 +49,38 @@ struct scsi_transport_template {
         dev_to_shost((tc)->dev)
 
 
+/* Private area maintenance. The driver requested allocations come
+ * directly after the transport class allocations (if any).  The idea
+ * is that you *must* call these only once.  The code assumes that the
+ * initial values are the ones the transport specific code requires */
+static inline void
+scsi_transport_reserve_target(struct scsi_transport_template * t, int space)
+{
+        BUG_ON(t->target_private_offset != 0);
+        t->target_private_offset = ALIGN(t->target_size, sizeof(void *));
+        t->target_size = t->target_private_offset + space;
+}
+static inline void
+scsi_transport_reserve_device(struct scsi_transport_template * t, int space)
+{
+        BUG_ON(t->device_private_offset != 0);
+        t->device_private_offset = ALIGN(t->device_size, sizeof(void *));
+        t->device_size = t->device_private_offset + space;
+}
+static inline void *
+scsi_transport_target_data(struct scsi_target *starget)
+{
+        struct Scsi_Host *shost = dev_to_shost(&starget->dev);
+        return (u8 *)starget->starget_data
+                + shost->transportt->target_private_offset;
+
+}
+static inline void *
+scsi_transport_device_data(struct scsi_device *sdev)
+{
+        struct Scsi_Host *shost = sdev->host;
+        return (u8 *)sdev->sdev_data
+                + shost->transportt->device_private_offset;
+}
+
 #endif /* SCSI_TRANSPORT_H */