[S390] dasd: add device attribute to disable blocking on lost paths

When the connection between host and storage server is lost, the
dasd device driver usually blocks all I/O on affected devices and
waits for them to reappear. In some setups however it would be
better if the I/O is returned as error so that device can be
recovered by some other means, eg. in a raid or multipath setup.

Signed-off-by: Holger Smolinski <Holger.Smolinski@de.ibm.com>
Signed-off-by: Stefan Weinhuber <wein@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

5 files changed, 55 insertions, 3 deletions

diff --git a/arch/s390/include/asm/dasd.h b/arch/s390/include/asm/dasd.h
index 55b2b80cdf6e..fb50a7864dd5 100644
--- a/arch/s390/include/asm/dasd.h
+++ b/arch/s390/include/asm/dasd.h
@@ -78,6 +78,7 @@ typedef struct dasd_information2_t {
 #define DASD_FEATURE_USEDIAG         0x02
 #define DASD_FEATURE_INITIAL_ONLINE  0x04
 #define DASD_FEATURE_ERPLOG          0x08
+#define DASD_FEATURE_FAILFAST        0x10
 
 #define DASD_PARTN_BITS 2
 
diff --git a/drivers/s390/block/dasd_devmap.c b/drivers/s390/block/dasd_devmap.c
index 2ef25731d197..300e28a531f8 100644
--- a/drivers/s390/block/dasd_devmap.c
+++ b/drivers/s390/block/dasd_devmap.c
@@ -206,6 +206,8 @@ dasd_feature_list(char *str, char **endp)
                         features |= DASD_FEATURE_USEDIAG;
                 else if (len == 6 && !strncmp(str, "erplog", 6))
                         features |= DASD_FEATURE_ERPLOG;
+                else if (len == 8 && !strncmp(str, "failfast", 8))
+                        features |= DASD_FEATURE_FAILFAST;
                 else {
                         MESSAGE(KERN_WARNING,
                                 "unsupported feature: %*s, "
@@ -667,6 +669,51 @@ dasd_device_from_cdev(struct ccw_device *cdev)
  */
 
 /*
+ * failfast controls the behaviour, if no path is available
+ */
+static ssize_t dasd_ff_show(struct device *dev, struct device_attribute *attr,
+                            char *buf)
+{
+        struct dasd_devmap *devmap;
+        int ff_flag;
+
+        devmap = dasd_find_busid(dev->bus_id);
+        if (!IS_ERR(devmap))
+                ff_flag = (devmap->features & DASD_FEATURE_FAILFAST) != 0;
+        else
+                ff_flag = (DASD_FEATURE_DEFAULT & DASD_FEATURE_FAILFAST) != 0;
+        return snprintf(buf, PAGE_SIZE, ff_flag ? "1\n" : "0\n");
+}
+
+static ssize_t dasd_ff_store(struct device *dev, struct device_attribute *attr,
+              const char *buf, size_t count)
+{
+        struct dasd_devmap *devmap;
+        int val;
+        char *endp;
+
+        devmap = dasd_devmap_from_cdev(to_ccwdev(dev));
+        if (IS_ERR(devmap))
+                return PTR_ERR(devmap);
+
+        val = simple_strtoul(buf, &endp, 0);
+        if (((endp + 1) < (buf + count)) || (val > 1))
+                return -EINVAL;
+
+        spin_lock(&dasd_devmap_lock);
+        if (val)
+                devmap->features |= DASD_FEATURE_FAILFAST;
+        else
+                devmap->features &= ~DASD_FEATURE_FAILFAST;
+        if (devmap->device)
+                devmap->device->features = devmap->features;
+        spin_unlock(&dasd_devmap_lock);
+        return count;
+}
+
+static DEVICE_ATTR(failfast, 0644, dasd_ff_show, dasd_ff_store);
+
+/*
  * readonly controls the readonly status of a dasd
  */
 static ssize_t
@@ -1020,6 +1067,7 @@ static struct attribute * dasd_attrs[] = {
         &dev_attr_use_diag.attr,
         &dev_attr_eer_enabled.attr,
         &dev_attr_erplog.attr,
+        &dev_attr_failfast.attr,
         NULL,
 };
 
diff --git a/drivers/s390/block/dasd_diag.c b/drivers/s390/block/dasd_diag.c
index 7844461a995b..ef2a56952054 100644
--- a/drivers/s390/block/dasd_diag.c
+++ b/drivers/s390/block/dasd_diag.c
@@ -544,7 +544,8 @@ static struct dasd_ccw_req *dasd_diag_build_cp(struct dasd_device *memdev,
         }
         cqr->retries = DIAG_MAX_RETRIES;
         cqr->buildclk = get_clock();
-        if (blk_noretry_request(req))
+        if (blk_noretry_request(req) ||
+            block->base->features & DASD_FEATURE_FAILFAST)
                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
         cqr->startdev = memdev;
         cqr->memdev = memdev;
diff --git a/drivers/s390/block/dasd_eckd.c b/drivers/s390/block/dasd_eckd.c
index bd2c52e20762..bdb87998f364 100644
--- a/drivers/s390/block/dasd_eckd.c
+++ b/drivers/s390/block/dasd_eckd.c
@@ -1700,7 +1700,8 @@ static struct dasd_ccw_req *dasd_eckd_build_cp(struct dasd_device *startdev,
                         recid++;
                 }
         }
-        if (blk_noretry_request(req))
+        if (blk_noretry_request(req) ||
+            block->base->features & DASD_FEATURE_FAILFAST)
                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
         cqr->startdev = startdev;
         cqr->memdev = startdev;
diff --git a/drivers/s390/block/dasd_fba.c b/drivers/s390/block/dasd_fba.c
index 7d442aeff3d1..f1d176021694 100644
--- a/drivers/s390/block/dasd_fba.c
+++ b/drivers/s390/block/dasd_fba.c
@@ -355,7 +355,8 @@ static struct dasd_ccw_req *dasd_fba_build_cp(struct dasd_device * memdev,
                         recid++;
                 }
         }
-        if (blk_noretry_request(req))
+        if (blk_noretry_request(req) ||
+            block->base->features & DASD_FEATURE_FAILFAST)
                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
         cqr->startdev = memdev;
         cqr->memdev = memdev;