[PATCH] Add block_device_operations.getgeo block device method

[mirror_ubuntu-bionic-kernel.git] / drivers / s390 / block / dasd.c

diff --git a/drivers/s390/block/dasd.c b/drivers/s390/block/dasd.c
index 7008d32433bf9d12725748f67d8d7c8bc746678b..2472fa1a1be14c72a6e324ec28e42070ea4fb253 100644 (file)
--- a/drivers/s390/block/dasd.c
+++ b/drivers/s390/block/dasd.c
@@ -7,7 +7,7 @@
  * Bugreports.to..: <Linux390@de.ibm.com>
  * (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 1999-2001
  *
- * $Revision: 1.167 $
+ * $Revision: 1.172 $
  */
 
 #include <linux/config.h>
@@ -18,6 +18,7 @@
 #include <linux/major.h>
 #include <linux/slab.h>
 #include <linux/buffer_head.h>
+#include <linux/hdreg.h>
 
 #include <asm/ccwdev.h>
 #include <asm/ebcdic.h>
@@ -604,7 +605,7 @@ dasd_smalloc_request(char *magic, int cplength, int datasize,
 void
 dasd_kfree_request(struct dasd_ccw_req * cqr, struct dasd_device * device)
 {
-#ifdef CONFIG_ARCH_S390X
+#ifdef CONFIG_64BIT
        struct ccw1 *ccw;
 
        /* Clear any idals used for the request. */
@@ -1035,7 +1036,7 @@ dasd_end_request(struct request *req, int uptodate)
        if (end_that_request_first(req, uptodate, req->hard_nr_sectors))
                BUG();
        add_disk_randomness(req->rq_disk);
-       end_that_request_last(req);
+       end_that_request_last(req, uptodate);
 }
 
 /*
@@ -1224,6 +1225,12 @@ __dasd_start_head(struct dasd_device * device)
        if (list_empty(&device->ccw_queue))
                return;
        cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, list);
+        /* check FAILFAST */
+       if (device->stopped & ~DASD_STOPPED_PENDING &&
+           test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags)) {
+               cqr->status = DASD_CQR_FAILED;
+               dasd_schedule_bh(device);
+       }
        if ((cqr->status == DASD_CQR_QUEUED) &&
            (!device->stopped)) {
                /* try to start the first I/O that can be started */
@@ -1323,7 +1330,7 @@ void
 dasd_schedule_bh(struct dasd_device * device)
 {
        /* Protect against rescheduling. */
-       if (atomic_compare_and_swap (0, 1, &device->tasklet_scheduled))
+       if (atomic_cmpxchg (&device->tasklet_scheduled, 0, 1) != 0)
                return;
        dasd_get_device(device);
        tasklet_hi_schedule(&device->tasklet);
@@ -1717,12 +1724,34 @@ dasd_release(struct inode *inp, struct file *filp)
        return 0;
 }
 
+/*
+ * Return disk geometry.
+ */
+static int
+dasd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
+{
+       struct dasd_device *device;
+
+       device = bdev->bd_disk->private_data;
+       if (!device)
+               return -ENODEV;
+
+       if (!device->discipline ||
+           !device->discipline->fill_geometry)
+               return -EINVAL;
+
+       device->discipline->fill_geometry(device, geo);
+       geo->start = get_start_sect(bdev) >> device->s2b_shift;
+       return 0;
+}
+
 struct block_device_operations
 dasd_device_operations = {
        .owner          = THIS_MODULE,
        .open           = dasd_open,
        .release        = dasd_release,
        .ioctl          = dasd_ioctl,
+       .getgeo         = dasd_getgeo,
 };
 
 
@@ -1750,8 +1779,10 @@ dasd_exit(void)
  * SECTION: common functions for ccw_driver use
  */
 
-/* initial attempt at a probe function. this can be simplified once
- * the other detection code is gone */
+/*
+ * Initial attempt at a probe function. this can be simplified once
+ * the other detection code is gone.
+ */
 int
 dasd_generic_probe (struct ccw_device *cdev,
                    struct dasd_discipline *discipline)
@@ -1770,8 +1801,10 @@ dasd_generic_probe (struct ccw_device *cdev,
        return ret;
 }
 
-/* this will one day be called from a global not_oper handler.
- * It is also used by driver_unregister during module unload */
+/*
+ * This will one day be called from a global not_oper handler.
+ * It is also used by driver_unregister during module unload.
+ */
 void
 dasd_generic_remove (struct ccw_device *cdev)
 {
@@ -1798,9 +1831,11 @@ dasd_generic_remove (struct ccw_device *cdev)
        dasd_delete_device(device);
 }
 
-/* activate a device. This is called from dasd_{eckd,fba}_probe() when either
+/*
+ * Activate a device. This is called from dasd_{eckd,fba}_probe() when either
  * the device is detected for the first time and is supposed to be used
- * or the user has started activation through sysfs */
+ * or the user has started activation through sysfs.
+ */
 int
 dasd_generic_set_online (struct ccw_device *cdev,
                         struct dasd_discipline *discipline)
@@ -1917,7 +1952,6 @@ dasd_generic_notify(struct ccw_device *cdev, int event)
                                if (cqr->status == DASD_CQR_IN_IO)
                                        cqr->status = DASD_CQR_FAILED;
                        device->stopped |= DASD_STOPPED_DC_EIO;
-                       dasd_schedule_bh(device);
                } else {
                        list_for_each_entry(cqr, &device->ccw_queue, list)
                                if (cqr->status == DASD_CQR_IN_IO) {
@@ -1927,6 +1961,7 @@ dasd_generic_notify(struct ccw_device *cdev, int event)
                        device->stopped |= DASD_STOPPED_DC_WAIT;
                        dasd_set_timer(device, 0);
                }
+               dasd_schedule_bh(device);
                ret = 1;
                break;
        case CIO_OPER: