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authorHannes Reinecke <hare@suse.de>2013-01-30 09:26:19 +0000
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2013-07-01 17:31:26 +0200
commit5ea34a01423a27d4526f3551e8542f2f991bd4a0 (patch)
treebadb135a40e6070c2a4d474e6a240457cb18b484 /drivers/s390/block/dasd_ioctl.c
parent3d71ad32167c9124d5621b54c37a74ef38aa93b0 (diff)
s390/dasd: Fail all requests when DASD_FLAG_ABORTIO is set
Whenever a DASD request encounters a timeout we might need to abort all outstanding requests on this or even other devices. This is especially useful if one wants to fail all devices on one side of a RAID10 configuration, even though only one device exhibited an error. To handle this I've introduced a new device flag DASD_FLAG_ABORTIO. This flag is evaluated in __dasd_process_request_queue() and will invoke blk_abort_request() for all outstanding requests with DASD_CQR_FLAGS_FAILFAST set. This will cause any of these requests to be aborted immediately if the blk_timeout function is activated. The DASD_FLAG_ABORTIO is also evaluated in __dasd_process_request_queue to abort all new request which would have the DASD_CQR_FLAGS_FAILFAST bit set. The flag can be set with the new ioctls 'BIODASDABORTIO' and removed with 'BIODASDALLOWIO'. Signed-off-by: Hannes Reinecke <hare@suse.de> Signed-off-by: Stefan Weinhuber <wein@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'drivers/s390/block/dasd_ioctl.c')
-rw-r--r--drivers/s390/block/dasd_ioctl.c59
1 files changed, 59 insertions, 0 deletions
diff --git a/drivers/s390/block/dasd_ioctl.c b/drivers/s390/block/dasd_ioctl.c
index 8be1b51e9311..25a0f2f8b0b9 100644
--- a/drivers/s390/block/dasd_ioctl.c
+++ b/drivers/s390/block/dasd_ioctl.c
@@ -141,6 +141,59 @@ static int dasd_ioctl_resume(struct dasd_block *block)
}
/*
+ * Abort all failfast I/O on a device.
+ */
+static int dasd_ioctl_abortio(struct dasd_block *block)
+{
+ unsigned long flags;
+ struct dasd_device *base;
+ struct dasd_ccw_req *cqr, *n;
+
+ base = block->base;
+ if (!capable(CAP_SYS_ADMIN))
+ return -EACCES;
+
+ if (test_and_set_bit(DASD_FLAG_ABORTALL, &base->flags))
+ return 0;
+ DBF_DEV_EVENT(DBF_NOTICE, base, "%s", "abortall flag set");
+
+ spin_lock_irqsave(&block->request_queue_lock, flags);
+ spin_lock(&block->queue_lock);
+ list_for_each_entry_safe(cqr, n, &block->ccw_queue, blocklist) {
+ if (test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags) &&
+ cqr->callback_data &&
+ cqr->callback_data != DASD_SLEEPON_START_TAG &&
+ cqr->callback_data != DASD_SLEEPON_END_TAG) {
+ spin_unlock(&block->queue_lock);
+ blk_abort_request(cqr->callback_data);
+ spin_lock(&block->queue_lock);
+ }
+ }
+ spin_unlock(&block->queue_lock);
+ spin_unlock_irqrestore(&block->request_queue_lock, flags);
+
+ dasd_schedule_block_bh(block);
+ return 0;
+}
+
+/*
+ * Allow I/O on a device
+ */
+static int dasd_ioctl_allowio(struct dasd_block *block)
+{
+ struct dasd_device *base;
+
+ base = block->base;
+ if (!capable(CAP_SYS_ADMIN))
+ return -EACCES;
+
+ if (test_and_clear_bit(DASD_FLAG_ABORTALL, &base->flags))
+ DBF_DEV_EVENT(DBF_NOTICE, base, "%s", "abortall flag unset");
+
+ return 0;
+}
+
+/*
* performs formatting of _device_ according to _fdata_
* Note: The discipline's format_function is assumed to deliver formatting
* commands to format multiple units of the device. In terms of the ECKD
@@ -458,6 +511,12 @@ int dasd_ioctl(struct block_device *bdev, fmode_t mode,
case BIODASDRESUME:
rc = dasd_ioctl_resume(block);
break;
+ case BIODASDABORTIO:
+ rc = dasd_ioctl_abortio(block);
+ break;
+ case BIODASDALLOWIO:
+ rc = dasd_ioctl_allowio(block);
+ break;
case BIODASDFMT:
rc = dasd_ioctl_format(bdev, argp);
break;