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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>
This commit is contained in:
Hannes Reinecke 2013-01-30 09:26:19 +00:00 committed by Martin Schwidefsky
parent 3d71ad3216
commit 5ea34a0142
4 changed files with 76 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
arch/s390/include/uapi/asm/dasd.h
View File

@ -261,6 +261,10 @@ struct dasd_snid_ioctl_data {
#define BIODASDQUIESCE _IO(DASD_IOCTL_LETTER,6)
/* Resume IO on device */
#define BIODASDRESUME _IO(DASD_IOCTL_LETTER,7)
/* Abort all I/O on a device */
#define BIODASDABORTIO _IO(DASD_IOCTL_LETTER, 240)
/* Allow I/O on a device */
#define BIODASDALLOWIO _IO(DASD_IOCTL_LETTER, 241)
/* retrieve API version number */

13
drivers/s390/block/dasd.c
View File

@ -38,9 +38,6 @@
*/
#define DASD_CHANQ_MAX_SIZE 4
#define DASD_SLEEPON_START_TAG (void *) 1
#define DASD_SLEEPON_END_TAG (void *) 2
/*
* SECTION: exported variables of dasd.c
*/
@ -2535,6 +2532,16 @@ static void __dasd_process_request_queue(struct dasd_block *block)
__blk_end_request_all(req, -EIO);
continue;
}
if (test_bit(DASD_FLAG_ABORTALL, &basedev->flags) &&
(basedev->features & DASD_FEATURE_FAILFAST ||
blk_noretry_request(req))) {
DBF_DEV_EVENT(DBF_ERR, basedev,
"Rejecting failfast request %p",
req);
blk_start_request(req);
__blk_end_request_all(req, -ETIMEDOUT);
continue;
}
cqr = basedev->discipline->build_cp(basedev, block, req);
if (IS_ERR(cqr)) {
if (PTR_ERR(cqr) == -EBUSY)

3
drivers/s390/block/dasd_int.h
View File

@ -524,7 +524,10 @@ struct dasd_block {
#define DASD_FLAG_SUSPENDED 9 /* The device was suspended */
#define DASD_FLAG_SAFE_OFFLINE 10 /* safe offline processing requested*/
#define DASD_FLAG_SAFE_OFFLINE_RUNNING 11 /* safe offline running */
#define DASD_FLAG_ABORTALL 12 /* Abort all noretry requests */
#define DASD_SLEEPON_START_TAG ((void *) 1)
#define DASD_SLEEPON_END_TAG ((void *) 2)
void dasd_put_device_wake(struct dasd_device *);

59
drivers/s390/block/dasd_ioctl.c
View File

@ -140,6 +140,59 @@ static int dasd_ioctl_resume(struct dasd_block *block)
return 0;
}
/*
* 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
@ -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;