7 files changed, 240 insertions, 2 deletions

diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index ef1afc178c0a..4a99b76c5a33 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -544,7 +544,7 @@ extern void blk_end_sync_rq(struct request *rq);
 extern void blk_attempt_remerge(request_queue_t *, struct request *);
 extern void __blk_attempt_remerge(request_queue_t *, struct request *);
 extern struct request *blk_get_request(request_queue_t *, int, int);
-extern void blk_insert_request(request_queue_t *, struct request *, int, void *, int);
+extern void blk_insert_request(request_queue_t *, struct request *, int, void *);
 extern void blk_requeue_request(request_queue_t *, struct request *);
 extern void blk_plug_device(request_queue_t *);
 extern int blk_remove_plug(request_queue_t *);
diff --git a/include/linux/chio.h b/include/linux/chio.h
new file mode 100644
index 000000000000..63035ae67e63
--- /dev/null
+++ b/include/linux/chio.h
@@ -0,0 +1,168 @@
+/*
+ * ioctl interface for the scsi media changer driver
+ */
+
+/* changer element types */
+#define CHET_MT   0     /* media transport element (robot) */
+#define CHET_ST   1     /* storage element (media slots) */
+#define CHET_IE   2     /* import/export element */
+#define CHET_DT   3     /* data transfer element (tape/cdrom/whatever) */
+#define CHET_V1   4     /* vendor specific #1 */
+#define CHET_V2   5     /* vendor specific #2 */
+#define CHET_V3   6     /* vendor specific #3 */
+#define CHET_V4   7     /* vendor specific #4 */
+
+
+/*
+ * CHIOGPARAMS
+ *    query changer properties
+ *
+ * CHIOVGPARAMS
+ *    query vendor-specific element types
+ *
+ *    accessing elements works by specifing type and unit of the element.
+ *    for eample, storage elements are addressed with type = CHET_ST and
+ *    unit = 0 .. cp_nslots-1
+ *
+ */
+struct changer_params {
+        int cp_curpicker;  /* current transport element */
+        int cp_npickers;   /* number of transport elements      (CHET_MT) */
+        int cp_nslots;     /* number of storage elements        (CHET_ST) */
+        int cp_nportals;   /* number of import/export elements  (CHET_IE) */
+        int cp_ndrives;    /* number of data transfer elements  (CHET_DT) */
+};
+struct changer_vendor_params {
+        int  cvp_n1;       /* number of vendor specific elems   (CHET_V1) */
+        char cvp_label1[16];
+        int  cvp_n2;       /* number of vendor specific elems   (CHET_V2) */
+        char cvp_label2[16];
+        int  cvp_n3;       /* number of vendor specific elems   (CHET_V3) */
+        char cvp_label3[16];
+        int  cvp_n4;       /* number of vendor specific elems   (CHET_V4) */
+        char cvp_label4[16];
+        int  reserved[8];
+};
+
+
+/*
+ * CHIOMOVE
+ *    move a medium from one element to another
+ */
+struct changer_move {
+        int cm_fromtype;        /* type/unit of source element */
+        int cm_fromunit;        
+        int cm_totype;  /* type/unit of destination element */
+        int cm_tounit;
+        int cm_flags;
+};
+#define CM_INVERT   1   /* flag: rotate media (for double-sided like MOD) */
+
+
+/*
+ * CHIOEXCHANGE
+ *    move one medium from element #1 to element #2,
+ *    and another one from element #2 to element #3.
+ *    element #1 and #3 are allowed to be identical.
+ */
+struct changer_exchange {
+        int ce_srctype;     /* type/unit of element #1 */
+        int ce_srcunit;
+        int ce_fdsttype;    /* type/unit of element #2 */
+        int ce_fdstunit;
+        int ce_sdsttype;    /* type/unit of element #3 */
+        int ce_sdstunit;
+        int ce_flags;
+};
+#define CE_INVERT1   1
+#define CE_INVERT2   2
+
+
+/*
+ * CHIOPOSITION
+ *    move the transport element (robot arm) to a specific element.
+ */
+struct changer_position {
+        int cp_type;
+        int cp_unit;
+        int cp_flags;
+};
+#define CP_INVERT   1
+
+
+/*
+ * CHIOGSTATUS
+ *    get element status for all elements of a specific type
+ */
+struct changer_element_status {
+        int             ces_type;
+        unsigned char   *ces_data;
+};
+#define CESTATUS_FULL     0x01 /* full */
+#define CESTATUS_IMPEXP   0x02  /* media was imported (inserted by sysop) */
+#define CESTATUS_EXCEPT   0x04  /* error condition */
+#define CESTATUS_ACCESS   0x08  /* access allowed */
+#define CESTATUS_EXENAB   0x10  /* element can export media */
+#define CESTATUS_INENAB   0x20  /* element can import media */
+
+
+/*
+ * CHIOGELEM
+ *    get more detailed status informtion for a single element
+ */
+struct changer_get_element {
+        int     cge_type;        /* type/unit */
+        int     cge_unit;
+        int     cge_status;      /* status */
+        int     cge_errno;       /* errno */
+        int     cge_srctype;     /* source element of the last move/exchange */
+        int     cge_srcunit;
+        int     cge_id;          /* scsi id  (for data transfer elements) */
+        int     cge_lun;         /* scsi lun (for data transfer elements) */
+        char    cge_pvoltag[36]; /* primary volume tag */
+        char    cge_avoltag[36]; /* alternate volume tag */
+        int     cge_flags;
+};
+/* flags */
+#define CGE_ERRNO     0x01       /* errno available       */
+#define CGE_INVERT    0x02       /* media inverted        */
+#define CGE_SRC       0x04       /* media src available   */
+#define CGE_IDLUN     0x08       /* ID+LUN available      */
+#define CGE_PVOLTAG   0x10       /* primary volume tag available */
+#define CGE_AVOLTAG   0x20       /* alternate volume tag available */
+
+
+/*
+ * CHIOSVOLTAG
+ *    set volume tag
+ */
+struct changer_set_voltag {
+        int     csv_type;        /* type/unit */
+        int     csv_unit;
+        char    csv_voltag[36];  /* volume tag */
+        int     csv_flags;
+};
+#define CSV_PVOLTAG   0x01       /* primary volume tag */
+#define CSV_AVOLTAG   0x02       /* alternate volume tag */
+#define CSV_CLEARTAG  0x04       /* clear volume tag */
+
+/* ioctls */
+#define CHIOMOVE       _IOW('c', 1,struct changer_move)
+#define CHIOEXCHANGE   _IOW('c', 2,struct changer_exchange)
+#define CHIOPOSITION   _IOW('c', 3,struct changer_position)
+#define CHIOGPICKER    _IOR('c', 4,int)                        /* not impl. */
+#define CHIOSPICKER    _IOW('c', 5,int)                        /* not impl. */
+#define CHIOGPARAMS    _IOR('c', 6,struct changer_params)
+#define CHIOGSTATUS    _IOW('c', 8,struct changer_element_status)
+#define CHIOGELEM      _IOW('c',16,struct changer_get_element)
+#define CHIOINITELEM   _IO('c',17)
+#define CHIOSVOLTAG    _IOW('c',18,struct changer_set_voltag)
+#define CHIOGVPARAMS   _IOR('c',19,struct changer_vendor_params)
+
+/* ---------------------------------------------------------------------- */
+
+/*
+ * Local variables:
+ * c-basic-offset: 8
+ * End:
+ */
diff --git a/include/linux/major.h b/include/linux/major.h
index 4b62c42b842c..e36a46702d94 100644
--- a/include/linux/major.h
+++ b/include/linux/major.h
@@ -100,6 +100,7 @@
 #define I2O_MAJOR               80      /* 80->87 */
 
 #define SHMIQ_MAJOR             85   /* Linux/mips, SGI /dev/shmiq */
+#define SCSI_CHANGER_MAJOR      86
 
 #define IDE6_MAJOR              88
 #define IDE7_MAJOR              89
diff --git a/include/scsi/scsi.h b/include/scsi/scsi.h
index 659ecf48fb4a..1fb233741513 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
@@ -210,6 +213,7 @@ 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 */