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authorStefan Weinhuber <wein@de.ibm.com>2006-03-24 03:15:25 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2006-03-24 07:33:17 -0800
commit20c644680af1ef9a6b36c0873f59498c98b07ab1 (patch)
treeaf2e50faeb690b7aacf7be3480f08f0a6ec0b56f /drivers/s390/block/dasd_devmap.c
parent554a826e0a29f1a88e5a5332f0718c059885ec17 (diff)
[PATCH] s390: dasd extended error reporting
The DASD extended error reporting is a facility that allows to get detailed information about certain problems in the DASD I/O. This information can be used to implement fail-over applications that can recover these problems. Signed-off-by: Stefan Weinhuber <wein@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'drivers/s390/block/dasd_devmap.c')
-rw-r--r--drivers/s390/block/dasd_devmap.c41
1 files changed, 41 insertions, 0 deletions
diff --git a/drivers/s390/block/dasd_devmap.c b/drivers/s390/block/dasd_devmap.c
index 1629b27c48a..f576f243cd9 100644
--- a/drivers/s390/block/dasd_devmap.c
+++ b/drivers/s390/block/dasd_devmap.c
@@ -715,10 +715,51 @@ dasd_discipline_show(struct device *dev, struct device_attribute *attr, char *bu
static DEVICE_ATTR(discipline, 0444, dasd_discipline_show, NULL);
+/*
+ * extended error-reporting
+ */
+static ssize_t
+dasd_eer_show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+ struct dasd_devmap *devmap;
+ int eer_flag;
+
+ devmap = dasd_find_busid(dev->bus_id);
+ if (!IS_ERR(devmap) && devmap->device)
+ eer_flag = dasd_eer_enabled(devmap->device);
+ else
+ eer_flag = 0;
+ return snprintf(buf, PAGE_SIZE, eer_flag ? "1\n" : "0\n");
+}
+
+static ssize_t
+dasd_eer_store(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct dasd_devmap *devmap;
+ int rc;
+
+ devmap = dasd_devmap_from_cdev(to_ccwdev(dev));
+ if (IS_ERR(devmap))
+ return PTR_ERR(devmap);
+ if (!devmap->device)
+ return count;
+ if (buf[0] == '1') {
+ rc = dasd_eer_enable(devmap->device);
+ if (rc)
+ return rc;
+ } else
+ dasd_eer_disable(devmap->device);
+ return count;
+}
+
+static DEVICE_ATTR(eer_enabled, 0644, dasd_eer_show, dasd_eer_store);
+
static struct attribute * dasd_attrs[] = {
&dev_attr_readonly.attr,
&dev_attr_discipline.attr,
&dev_attr_use_diag.attr,
+ &dev_attr_eer_enabled.attr,
NULL,
};