[patch 7/12] s390: dasd readonly attribute.
From: Horst Hummel <[email protected]>
The independent read-only flags in devmap, dasd_device and gendisk
are not kept in sync. Use one bit per feature in the dasd driver and
keep that bit in sync with the gendisk bit.
Signed-off-by: Martin Schwidefsky <[email protected]>
diffstat:
drivers/s390/block/dasd.c | 20 +++++++++----
drivers/s390/block/dasd_devmap.c | 59 +++++++++++++++++++++++++++------------
drivers/s390/block/dasd_genhd.c | 10 ++++--
drivers/s390/block/dasd_int.h | 7 ++--
drivers/s390/block/dasd_ioctl.c | 31 +++++++++++++-------
drivers/s390/block/dasd_proc.c | 8 +++--
6 files changed, 93 insertions(+), 42 deletions(-)
diff -urpN linux-2.6/drivers/s390/block/dasd.c linux-2.6-patched/drivers/s390/block/dasd.c
--- linux-2.6/drivers/s390/block/dasd.c 2005-04-22 15:44:48.000000000 +0200
+++ linux-2.6-patched/drivers/s390/block/dasd.c 2005-04-22 15:45:04.000000000 +0200
@@ -7,7 +7,7 @@
* Bugreports.to..: <[email protected]>
* (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 1999-2001
*
- * $Revision: 1.158 $
+ * $Revision: 1.161 $
*/
#include <linux/config.h>
@@ -1131,13 +1131,17 @@ __dasd_process_blk_queue(struct dasd_dev
request_queue_t *queue;
struct request *req;
struct dasd_ccw_req *cqr;
- int nr_queued;
+ int nr_queued, feature_ro;
queue = device->request_queue;
/* No queue ? Then there is nothing to do. */
if (queue == NULL)
return;
+ feature_ro = dasd_get_feature(device->cdev, DASD_FEATURE_READONLY);
+ if (feature_ro < 0) /* no devmap */
+ return;
+
/*
* We requeue request from the block device queue to the ccw
* queue only in two states. In state DASD_STATE_READY the
@@ -1157,8 +1161,8 @@ __dasd_process_blk_queue(struct dasd_dev
elv_next_request(queue) &&
nr_queued < DASD_CHANQ_MAX_SIZE) {
req = elv_next_request(queue);
- if (test_bit(DASD_FLAG_RO, &device->flags) &&
- rq_data_dir(req) == WRITE) {
+
+ if (feature_ro && rq_data_dir(req) == WRITE) {
DBF_DEV_EVENT(DBF_ERR, device,
"Rejecting write request %p",
req);
@@ -1803,13 +1807,17 @@ dasd_generic_set_online (struct ccw_devi
{
struct dasd_device *device;
- int rc;
+ int feature_diag, rc;
+
+ feature_diag = dasd_get_feature(cdev, DASD_FEATURE_USEDIAG);
+ if (feature_diag < 0)
+ return feature_diag;
device = dasd_create_device(cdev);
if (IS_ERR(device))
return PTR_ERR(device);
- if (test_bit(DASD_FLAG_USE_DIAG, &device->flags)) {
+ if (feature_diag) {
if (!dasd_diag_discipline_pointer) {
printk (KERN_WARNING
"dasd_generic couldn't online device %s "
diff -urpN linux-2.6/drivers/s390/block/dasd_devmap.c linux-2.6-patched/drivers/s390/block/dasd_devmap.c
--- linux-2.6/drivers/s390/block/dasd_devmap.c 2005-03-02 08:38:09.000000000 +0100
+++ linux-2.6-patched/drivers/s390/block/dasd_devmap.c 2005-04-22 15:45:04.000000000 +0200
@@ -11,7 +11,7 @@
* functions may not be called from interrupt context. In particular
* dasd_get_device is a no-no from interrupt context.
*
- * $Revision: 1.37 $
+ * $Revision: 1.40 $
*/
#include <linux/config.h>
@@ -513,14 +513,6 @@ dasd_create_device(struct ccw_device *cd
if (!devmap->device) {
devmap->device = device;
device->devindex = devmap->devindex;
- if (devmap->features & DASD_FEATURE_READONLY)
- set_bit(DASD_FLAG_RO, &device->flags);
- else
- clear_bit(DASD_FLAG_RO, &device->flags);
- if (devmap->features & DASD_FEATURE_USEDIAG)
- set_bit(DASD_FLAG_USE_DIAG, &device->flags);
- else
- clear_bit(DASD_FLAG_USE_DIAG, &device->flags);
get_device(&cdev->dev);
device->cdev = cdev;
rc = 0;
@@ -651,14 +643,8 @@ dasd_ro_store(struct device *dev, const
devmap->features |= DASD_FEATURE_READONLY;
else
devmap->features &= ~DASD_FEATURE_READONLY;
- if (devmap->device) {
- if (devmap->device->gdp)
- set_disk_ro(devmap->device->gdp, ro_flag);
- if (ro_flag)
- set_bit(DASD_FLAG_RO, &devmap->device->flags);
- else
- clear_bit(DASD_FLAG_RO, &devmap->device->flags);
- }
+ if (devmap->device && devmap->device->gdp)
+ set_disk_ro(devmap->device->gdp, ro_flag);
spin_unlock(&dasd_devmap_lock);
return count;
}
@@ -739,6 +725,45 @@ static struct attribute_group dasd_attr_
.attrs = dasd_attrs,
};
+/*
+ * Return value of the specified feature.
+ */
+int
+dasd_get_feature(struct ccw_device *cdev, int feature)
+{
+ struct dasd_devmap *devmap;
+
+ devmap = dasd_find_busid(cdev->dev.bus_id);
+ if (IS_ERR(devmap))
+ return (int) PTR_ERR(devmap);
+
+ return ((devmap->features & feature) != 0);
+}
+
+/*
+ * Set / reset given feature.
+ * Flag indicates wether to set (!=0) or the reset (=0) the feature.
+ */
+int
+dasd_set_feature(struct ccw_device *cdev, int feature, int flag)
+{
+ struct dasd_devmap *devmap;
+
+ devmap = dasd_find_busid(cdev->dev.bus_id);
+ if (IS_ERR(devmap))
+ return (int) PTR_ERR(devmap);
+
+ spin_lock(&dasd_devmap_lock);
+ if (flag)
+ devmap->features |= feature;
+ else
+ devmap->features &= ~feature;
+
+ spin_unlock(&dasd_devmap_lock);
+ return 0;
+}
+
+
int
dasd_add_sysfs_files(struct ccw_device *cdev)
{
diff -urpN linux-2.6/drivers/s390/block/dasd_genhd.c linux-2.6-patched/drivers/s390/block/dasd_genhd.c
--- linux-2.6/drivers/s390/block/dasd_genhd.c 2005-03-02 08:38:17.000000000 +0100
+++ linux-2.6-patched/drivers/s390/block/dasd_genhd.c 2005-04-22 15:45:04.000000000 +0200
@@ -9,7 +9,7 @@
*
* gendisk related functions for the dasd driver.
*
- * $Revision: 1.48 $
+ * $Revision: 1.50 $
*/
#include <linux/config.h>
@@ -31,12 +31,16 @@ int
dasd_gendisk_alloc(struct dasd_device *device)
{
struct gendisk *gdp;
- int len;
+ int len, feature_ro;
/* Make sure the minor for this device exists. */
if (device->devindex >= DASD_PER_MAJOR)
return -EBUSY;
+ feature_ro = dasd_get_feature(device->cdev, DASD_FEATURE_READONLY);
+ if (feature_ro < 0)
+ return feature_ro;
+
gdp = alloc_disk(1 << DASD_PARTN_BITS);
if (!gdp)
return -ENOMEM;
@@ -71,7 +75,7 @@ dasd_gendisk_alloc(struct dasd_device *d
sprintf(gdp->devfs_name, "dasd/%s", device->cdev->dev.bus_id);
- if (test_bit(DASD_FLAG_RO, &device->flags))
+ if (feature_ro)
set_disk_ro(gdp, 1);
gdp->private_data = device;
gdp->queue = device->request_queue;
diff -urpN linux-2.6/drivers/s390/block/dasd_int.h linux-2.6-patched/drivers/s390/block/dasd_int.h
--- linux-2.6/drivers/s390/block/dasd_int.h 2005-03-02 08:38:13.000000000 +0100
+++ linux-2.6-patched/drivers/s390/block/dasd_int.h 2005-04-22 15:45:04.000000000 +0200
@@ -6,7 +6,7 @@
* Bugreports.to..: <[email protected]>
* (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 1999,2000
*
- * $Revision: 1.63 $
+ * $Revision: 1.64 $
*/
#ifndef DASD_INT_H
@@ -329,8 +329,6 @@ struct dasd_device {
#define DASD_STOPPED_DC_EIO 16 /* disconnected, return -EIO */
/* per device flags */
-#define DASD_FLAG_RO 0 /* device is read-only */
-#define DASD_FLAG_USE_DIAG 1 /* use diag disciplnie */
#define DASD_FLAG_DSC_ERROR 2 /* return -EIO when disconnected */
#define DASD_FLAG_OFFLINE 3 /* device is in offline processing */
@@ -501,6 +499,9 @@ void dasd_devmap_exit(void);
struct dasd_device *dasd_create_device(struct ccw_device *);
void dasd_delete_device(struct dasd_device *);
+int dasd_get_feature(struct ccw_device *, int);
+int dasd_set_feature(struct ccw_device *, int, int);
+
int dasd_add_sysfs_files(struct ccw_device *);
void dasd_remove_sysfs_files(struct ccw_device *);
diff -urpN linux-2.6/drivers/s390/block/dasd_ioctl.c linux-2.6-patched/drivers/s390/block/dasd_ioctl.c
--- linux-2.6/drivers/s390/block/dasd_ioctl.c 2005-03-02 08:38:10.000000000 +0100
+++ linux-2.6-patched/drivers/s390/block/dasd_ioctl.c 2005-04-22 15:45:04.000000000 +0200
@@ -7,6 +7,8 @@
* Bugreports.to..: <[email protected]>
* (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 1999-2001
*
+ * $Revision: 1.45 $
+ *
* i/o controls for the dasd driver.
*/
#include <linux/config.h>
@@ -294,6 +296,7 @@ dasd_ioctl_format(struct block_device *b
{
struct dasd_device *device;
struct format_data_t fdata;
+ int feature_ro;
if (!capable(CAP_SYS_ADMIN))
return -EACCES;
@@ -304,7 +307,11 @@ dasd_ioctl_format(struct block_device *b
if (device == NULL)
return -ENODEV;
- if (test_bit(DASD_FLAG_RO, &device->flags))
+
+ feature_ro = dasd_get_feature(device->cdev, DASD_FEATURE_READONLY);
+ if (feature_ro < 0)
+ return feature_ro;
+ if (feature_ro)
return -EROFS;
if (copy_from_user(&fdata, (void __user *) args,
sizeof (struct format_data_t)))
@@ -377,7 +384,7 @@ dasd_ioctl_information(struct block_devi
struct dasd_device *device;
struct dasd_information2_t *dasd_info;
unsigned long flags;
- int rc;
+ int rc, feature_ro;
struct ccw_device *cdev;
device = bdev->bd_disk->private_data;
@@ -387,6 +394,10 @@ dasd_ioctl_information(struct block_devi
if (!device->discipline->fill_info)
return -EINVAL;
+ feature_ro = dasd_get_feature(device->cdev, DASD_FEATURE_READONLY);
+ if (feature_ro < 0)
+ return feature_ro;
+
dasd_info = kmalloc(sizeof(struct dasd_information2_t), GFP_KERNEL);
if (dasd_info == NULL)
return -ENOMEM;
@@ -415,9 +426,8 @@ dasd_ioctl_information(struct block_devi
if ((device->state < DASD_STATE_READY) ||
(dasd_check_blocksize(device->bp_block)))
dasd_info->format = DASD_FORMAT_NONE;
-
- dasd_info->features |= test_bit(DASD_FLAG_RO, &device->flags) ?
- DASD_FEATURE_READONLY : DASD_FEATURE_DEFAULT;
+
+ dasd_info->features |= feature_ro;
if (device->discipline)
memcpy(dasd_info->type, device->discipline->name, 4);
@@ -460,7 +470,7 @@ static int
dasd_ioctl_set_ro(struct block_device *bdev, int no, long args)
{
struct dasd_device *device;
- int intval;
+ int intval, rc;
if (!capable(CAP_SYS_ADMIN))
return -EACCES;
@@ -472,12 +482,11 @@ dasd_ioctl_set_ro(struct block_device *b
device = bdev->bd_disk->private_data;
if (device == NULL)
return -ENODEV;
+
set_disk_ro(bdev->bd_disk, intval);
- if (intval)
- set_bit(DASD_FLAG_RO, &device->flags);
- else
- clear_bit(DASD_FLAG_RO, &device->flags);
- return 0;
+ rc = dasd_set_feature(device->cdev, DASD_FEATURE_READONLY, intval);
+
+ return rc;
}
/*
diff -urpN linux-2.6/drivers/s390/block/dasd_proc.c linux-2.6-patched/drivers/s390/block/dasd_proc.c
--- linux-2.6/drivers/s390/block/dasd_proc.c 2005-03-02 08:37:50.000000000 +0100
+++ linux-2.6-patched/drivers/s390/block/dasd_proc.c 2005-04-22 15:45:04.000000000 +0200
@@ -9,7 +9,7 @@
*
* /proc interface for the dasd driver.
*
- * $Revision: 1.30 $
+ * $Revision: 1.31 $
*/
#include <linux/config.h>
@@ -54,6 +54,7 @@ dasd_devices_show(struct seq_file *m, vo
{
struct dasd_device *device;
char *substr;
+ int feature;
device = dasd_device_from_devindex((unsigned long) v - 1);
if (IS_ERR(device))
@@ -77,7 +78,10 @@ dasd_devices_show(struct seq_file *m, vo
else
seq_printf(m, " is ????????");
/* Print devices features. */
- substr = test_bit(DASD_FLAG_RO, &device->flags) ? "(ro)" : " ";
+ feature = dasd_get_feature(device->cdev, DASD_FEATURE_READONLY);
+ if (feature < 0)
+ return 0;
+ substr = feature ? "(ro)" : " ";
seq_printf(m, "%4s: ", substr);
/* Print device status information. */
switch ((device != NULL) ? device->state : -1) {