[PATCH] cpqarray fixes

This restores the special-case behaviour of open() on the minor 0;
cpqarray allows to open that guy for ioctls even if nothing is
configured.  That got broken when gendisk patches went in.  Patch
restores the old behaviour by keeping gendisk for the first disk on
controller always registered; instead of unregistering it we set size to
0.

drivers/block/cpqarray.c

@@ -134,7 +134,7 @@ static int sendcmd(
 static int ida_open(struct inode *inode, struct file *filep);
 static int ida_release(struct inode *inode, struct file *filep);
 static int ida_ioctl(struct inode *inode, struct file *filep, unsigned int cmd, unsigned long arg);
-static int ida_ctlr_ioctl(int ctlr, int dsk, ida_ioctl_t *io);
+static int ida_ctlr_ioctl(ctlr_info_t *h, int dsk, ida_ioctl_t *io);
 
 static void do_ida_request(request_queue_t *q);
 static void start_io(ctlr_info_t *h);
@@ -147,7 +147,7 @@ static inline void complete_command(cmdlist_t *cmd, int timeout);
 static irqreturn_t do_ida_intr(int irq, void *dev_id, struct pt_regs * regs);
 static void ida_timer(unsigned long tdata);
 static int ida_revalidate(struct gendisk *disk);
-static int revalidate_allvol(kdev_t dev);
+static int revalidate_allvol(ctlr_info_t *host);
 
 #ifdef CONFIG_PROC_FS
 static void ida_procinit(int i);
@@ -158,6 +158,17 @@ static int ida_proc_get_info(char *buffer, char **start, off_t offset,
 			     int length, int *eof, void *data) { return 0;}
 #endif
 
+static inline drv_info_t *get_drv(struct gendisk *disk)
+{
+	return disk->private_data;
+}
+
+static inline ctlr_info_t *get_host(struct gendisk *disk)
+{
+	return disk->queue->queuedata;
+}
+
+
 static struct block_device_operations ida_fops  = {
 	.owner		= THIS_MODULE,
 	.open		= ida_open,
@@ -401,7 +412,7 @@ static int __init cpqarray_init(void)
 			disk->major = COMPAQ_SMART2_MAJOR + i;
 			disk->first_minor = j<<NWD_SHIFT;
 			disk->fops = &ida_fops; 
-			if (!drv->nr_blks)
+			if (j && !drv->nr_blks)
 				continue;
 			hba[i]->queue.hardsect_size = drv->blk_size;
 			set_capacity(disk, drv->nr_blks);
@@ -704,27 +715,23 @@ DBGINFO(
  */
 static int ida_open(struct inode *inode, struct file *filep)
 {
-	int ctlr = major(inode->i_rdev) - COMPAQ_SMART2_MAJOR;
-	int dsk  = minor(inode->i_rdev) >> NWD_SHIFT;
-
-	DBGINFO(printk("ida_open %x (%x:%x)\n", inode->i_rdev, ctlr, dsk) );
-	if (ctlr > MAX_CTLR || hba[ctlr] == NULL)
-		return -ENXIO;
+	drv_info_t *drv = get_drv(inode->i_bdev->bd_disk);
+	ctlr_info_t *host = get_host(inode->i_bdev->bd_disk);
 
+	DBGINFO(printk("ida_open %s\n", inode->i_bdev->bd_disk->disk_name));
 	/*
 	 * Root is allowed to open raw volume zero even if it's not configured
 	 * so array config can still work.  I don't think I really like this,
 	 * but I'm already using way to many device nodes to claim another one
 	 * for "raw controller".
 	 */
-	if (!hba[ctlr]->drv[dsk].nr_blks) {
+	if (!drv->nr_blks) {
 		if (!capable(CAP_SYS_RAWIO))
 			return -ENXIO;
-		/* Huh??? */
-		if (capable(CAP_SYS_ADMIN) && minor(inode->i_rdev) != 0)
+		if (!capable(CAP_SYS_ADMIN) && drv != host->drv)
 			return -ENXIO;
 	}
-	hba[ctlr]->usage_count++;
+	host->usage_count++;
 	return 0;
 }
 
@@ -733,8 +740,8 @@ static int ida_open(struct inode *inode, struct file *filep)
  */
 static int ida_release(struct inode *inode, struct file *filep)
 {
-	int ctlr = major(inode->i_rdev) - COMPAQ_SMART2_MAJOR;
-	hba[ctlr]->usage_count--;
+	ctlr_info_t *host = get_host(inode->i_bdev->bd_disk);
+	host->usage_count--;
 	return 0;
 }
 
@@ -1015,8 +1022,8 @@ static void ida_timer(unsigned long tdata)
  */
 static int ida_ioctl(struct inode *inode, struct file *filep, unsigned int cmd, unsigned long arg)
 {
-	int ctlr = major(inode->i_rdev) - COMPAQ_SMART2_MAJOR;
-	int dsk  = minor(inode->i_rdev) >> NWD_SHIFT;
+	drv_info_t *drv = get_drv(inode->i_bdev->bd_disk);
+	ctlr_info_t *host = get_host(inode->i_bdev->bd_disk);
 	int error;
 	int diskinfo[4];
 	struct hd_geometry *geo = (struct hd_geometry *)arg;
@@ -1025,14 +1032,14 @@ static int ida_ioctl(struct inode *inode, struct file *filep, unsigned int cmd,
 
 	switch(cmd) {
 	case HDIO_GETGEO:
-		if (hba[ctlr]->drv[dsk].cylinders) {
-			diskinfo[0] = hba[ctlr]->drv[dsk].heads;
-			diskinfo[1] = hba[ctlr]->drv[dsk].sectors;
-			diskinfo[2] = hba[ctlr]->drv[dsk].cylinders;
+		if (drv->cylinders) {
+			diskinfo[0] = drv->heads;
+			diskinfo[1] = drv->sectors;
+			diskinfo[2] = drv->cylinders;
 		} else {
 			diskinfo[0] = 0xff;
 			diskinfo[1] = 0x3f;
-			diskinfo[2] = hba[ctlr]->drv[dsk].nr_blks / (0xff*0x3f);
+			diskinfo[2] = drv->nr_blks / (0xff*0x3f);
 		}
 		put_user(diskinfo[0], &geo->heads);
 		put_user(diskinfo[1], &geo->sectors);
@@ -1040,23 +1047,24 @@ static int ida_ioctl(struct inode *inode, struct file *filep, unsigned int cmd,
 		put_user(get_start_sect(inode->i_bdev), &geo->start);
 		return 0;
 	case IDAGETDRVINFO:
-		if (copy_to_user(&io->c.drv, &hba[ctlr]->drv[dsk],
-				 sizeof(drv_info_t)))
+		if (copy_to_user(&io->c.drv, drv, sizeof(drv_info_t)))
 			return -EFAULT;
 		return 0;
 	case IDAPASSTHRU:
 		if (!capable(CAP_SYS_RAWIO)) return -EPERM;
 		if (copy_from_user(&my_io, io, sizeof(my_io)))
 			return -EFAULT;
-		error = ida_ctlr_ioctl(ctlr, dsk, &my_io);
+		error = ida_ctlr_ioctl(host, drv - host->drv, &my_io);
 		if (error) return error;
 		return copy_to_user(io, &my_io, sizeof(my_io)) ? -EFAULT : 0;
 	case IDAGETCTLRSIG:
 		if (!arg) return -EINVAL;
-		put_user(hba[ctlr]->ctlr_sig, (int*)arg);
+		put_user(host->ctlr_sig, (int*)arg);
 		return 0;
 	case IDAREVALIDATEVOLS:
-		return revalidate_allvol(inode->i_rdev);
+		if (minor(inode->i_rdev) != 0)
+			return -ENXIO;
+		return revalidate_allvol(host);
 	case IDADRIVERVERSION:
 		if (!arg) return -EINVAL;
 		put_user(DRIVER_VERSION, (unsigned long*)arg);
@@ -1067,9 +1075,9 @@ static int ida_ioctl(struct inode *inode, struct file *filep, unsigned int cmd,
 		ida_pci_info_struct pciinfo;
 
 		if (!arg) return -EINVAL;
-		pciinfo.bus = hba[ctlr]->pci_dev->bus->number;
-		pciinfo.dev_fn = hba[ctlr]->pci_dev->devfn;
-		pciinfo.board_id = hba[ctlr]->board_id;
+		pciinfo.bus = host->pci_dev->bus->number;
+		pciinfo.dev_fn = host->pci_dev->devfn;
+		pciinfo.board_id = host->board_id;
 		if(copy_to_user((void *) arg, &pciinfo,  
 			sizeof( ida_pci_info_struct)))
 				return -EFAULT;
@@ -1091,9 +1099,9 @@ static int ida_ioctl(struct inode *inode, struct file *filep, unsigned int cmd,
  * any serious sanity checking on the arguments.  Doing an IDA_WRITE_MEDIA and
  * putting a 64M buffer in the sglist is probably a *bad* idea.
  */
-static int ida_ctlr_ioctl(int ctlr, int dsk, ida_ioctl_t *io)
+static int ida_ctlr_ioctl(ctlr_info_t *h, int dsk, ida_ioctl_t *io)
 {
-	ctlr_info_t *h = hba[ctlr];
+	int ctlr = h->ctlr;
 	cmdlist_t *c;
 	void *p = NULL;
 	unsigned long flags;
@@ -1387,59 +1395,57 @@ DBG(
  * particualar logical volume (instead of all of them on a particular
  * controller).
  */
-static int revalidate_allvol(kdev_t dev)
+static int revalidate_allvol(ctlr_info_t *host)
 {
-	int ctlr, i;
+	int ctlr = host->ctlr;
+	int i;
 	unsigned long flags;
 
-	if (minor(dev) != 0)
-		return -ENXIO;
-
-	ctlr = major(dev) - COMPAQ_SMART2_MAJOR;
-
 	spin_lock_irqsave(IDA_LOCK(ctlr), flags);
-	if (hba[ctlr]->usage_count > 1) {
+	if (host->usage_count > 1) {
 		spin_unlock_irqrestore(IDA_LOCK(ctlr), flags);
 		printk(KERN_WARNING "cpqarray: Device busy for volume"
-			" revalidation (usage=%d)\n", hba[ctlr]->usage_count);
+			" revalidation (usage=%d)\n", host->usage_count);
 		return -EBUSY;
 	}
-	hba[ctlr]->usage_count++;
+	host->usage_count++;
 	spin_unlock_irqrestore(IDA_LOCK(ctlr), flags);
 
 	/*
 	 * Set the partition and block size structures for all volumes
 	 * on this controller to zero.  We will reread all of this data
 	 */
-	for (i = 0; i < NWD; i++) {
+	set_capacity(ida_gendisk[ctlr][0], 0);
+	for (i = 1; i < NWD; i++) {
 		struct gendisk *disk = ida_gendisk[ctlr][i];
 		if (disk->flags & GENHD_FL_UP)
 			del_gendisk(disk);
 	}
-	memset(hba[ctlr]->drv,            0, sizeof(drv_info_t)*NWD);
+	memset(host->drv, 0, sizeof(drv_info_t)*NWD);
 
 	/*
 	 * Tell the array controller not to give us any interrupts while
 	 * we check the new geometry.  Then turn interrupts back on when
 	 * we're done.
 	 */
-	hba[ctlr]->access.set_intr_mask(hba[ctlr], 0);
+	host->access.set_intr_mask(host, 0);
 	getgeometry(ctlr);
-	hba[ctlr]->access.set_intr_mask(hba[ctlr], FIFO_NOT_EMPTY);
+	host->access.set_intr_mask(host, FIFO_NOT_EMPTY);
 
 	for(i=0; i<NWD; i++) {
 		struct gendisk *disk = ida_gendisk[ctlr][i];
-		drv_info_t *drv = &hba[ctlr]->drv[i];
-		if (!drv->nr_blks)
+		drv_info_t *drv = &host->drv[i];
+		if (i && !drv->nr_blks)
 			continue;
-		hba[ctlr]->queue.hardsect_size = drv->blk_size;
+		host->queue.hardsect_size = drv->blk_size;
 		set_capacity(disk, drv->nr_blks);
-		disk->queue = &hba[ctlr]->queue;
+		disk->queue = &host->queue;
 		disk->private_data = drv;
-		add_disk(disk);
+		if (i)
+			add_disk(disk);
 	}
 
-	hba[ctlr]->usage_count--;
+	host->usage_count--;
 	return 0;
 }