cciss: Dynamically allocate the drive_info_struct for each logical drive.

cciss: Dynamically allocate the drive_info_struct for each logical drive.
This reduces the size of the per-hba ctlr_info structure from 106936
bytes to 8132 bytes.  That's on 32-bit systems.  On 64-bit systems, the
improvement is even bigger.  Without this, the ctlr_info struct is so big
that the driver won't even load on a 64 bit system if CISS_MAX_LUN was
at it's current setting of 1024 logical drives.

Signed-off-by: Stephen M. Cameron <scameron@beardog.cce.hp.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

1 files changed, 3 insertions, 2 deletions

diff --git a/drivers/block/cciss.h b/drivers/block/cciss.h
index 5188f713d1b0..31524cf42c77 100644
--- a/drivers/block/cciss.h
+++ b/drivers/block/cciss.h
@@ -45,13 +45,14 @@ typedef struct _drive_info_struct
                                    * to prevent it from being opened or it's
                                    * queue from being started.
                                    */
-        struct  device *dev;
+        struct  device dev;
         __u8 serial_no[16]; /* from inquiry page 0x83,
                              * not necc. null terminated.
                              */
         char vendor[VENDOR_LEN + 1]; /* SCSI vendor string */
         char model[MODEL_LEN + 1];   /* SCSI model string */
         char rev[REV_LEN + 1];       /* SCSI revision string */
+        char device_initialized;     /* indicates whether dev is initialized */
 } drive_info_struct;
 
 struct ctlr_info 
@@ -87,7 +88,7 @@ struct ctlr_info
         BYTE    cciss_read_capacity;
 
         // information about each logical volume
-        drive_info_struct drv[CISS_MAX_LUN];
+        drive_info_struct *drv[CISS_MAX_LUN];
 
         struct access_method access;