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[S390] dasd: provide a Sense Path Group ID ioctl

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The BIODASDSNID ioctl executes a 'Sense Path Group ID'
command on a DASD ECKD device. The returned path group data
allows user space programs to determine path state and
path group ID of the channel paths to the device.

Signed-off-by: Stefan Weinhuber <[email protected]>
Signed-off-by: Martin Schwidefsky <[email protected]>
This commit is contained in:
Stefan Weinhuber 2010-10-29 16:50:43 +02:00 • committed by Martin Schwidefsky
commit 196339f173
3 changed files with 92 additions and 18 deletions
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69
drivers/s390/block/dasd_eckd.c
View file

@ -2801,6 +2801,73 @@ dasd_eckd_steal_lock(struct dasd_device *device)
return rc;
}
/*
* SNID - Sense Path Group ID
* This ioctl may be used in situations where I/O is stalled due to
* a reserve, so if the normal dasd_smalloc_request fails, we use the
* preallocated dasd_reserve_req.
*/
static int dasd_eckd_snid(struct dasd_device *device,
void __user *argp)
{
struct dasd_ccw_req *cqr;
int rc;
struct ccw1 *ccw;
int useglobal;
struct dasd_snid_ioctl_data usrparm;
if (!capable(CAP_SYS_ADMIN))
return -EACCES;
if (copy_from_user(&usrparm, argp, sizeof(usrparm)))
return -EFAULT;
useglobal = 0;
cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1,
sizeof(struct dasd_snid_data), device);
if (IS_ERR(cqr)) {
mutex_lock(&dasd_reserve_mutex);
useglobal = 1;
cqr = &dasd_reserve_req->cqr;
memset(cqr, 0, sizeof(*cqr));
memset(&dasd_reserve_req->ccw, 0,
sizeof(dasd_reserve_req->ccw));
cqr->cpaddr = &dasd_reserve_req->ccw;
cqr->data = &dasd_reserve_req->data;
cqr->magic = DASD_ECKD_MAGIC;
}
ccw = cqr->cpaddr;
ccw->cmd_code = DASD_ECKD_CCW_SNID;
ccw->flags |= CCW_FLAG_SLI;
ccw->count = 12;
ccw->cda = (__u32)(addr_t) cqr->data;
cqr->startdev = device;
cqr->memdev = device;
clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
cqr->retries = 5;
cqr->expires = 10 * HZ;
cqr->buildclk = get_clock();
cqr->status = DASD_CQR_FILLED;
cqr->lpm = usrparm.path_mask;
rc = dasd_sleep_on_immediatly(cqr);
/* verify that I/O processing didn't modify the path mask */
if (!rc && usrparm.path_mask && (cqr->lpm != usrparm.path_mask))
rc = -EIO;
if (!rc) {
usrparm.data = *((struct dasd_snid_data *)cqr->data);
if (copy_to_user(argp, &usrparm, sizeof(usrparm)))
rc = -EFAULT;
}
if (useglobal)
mutex_unlock(&dasd_reserve_mutex);
else
dasd_sfree_request(cqr, cqr->memdev);
return rc;
}
/*
* Read performance statistics
*/
@ -3036,6 +3103,8 @@ dasd_eckd_ioctl(struct dasd_block *block, unsigned int cmd, void __user *argp)
return dasd_eckd_reserve(device);
case BIODASDSLCK:
return dasd_eckd_steal_lock(device);
case BIODASDSNID:
return dasd_eckd_snid(device, argp);
case BIODASDSYMMIO:
return dasd_symm_io(device, argp);
default:

1
drivers/s390/block/dasd_eckd.h
View file

@ -27,6 +27,7 @@
#define DASD_ECKD_CCW_WRITE_CKD 0x1d
#define DASD_ECKD_CCW_READ_CKD 0x1e
#define DASD_ECKD_CCW_PSF 0x27
#define DASD_ECKD_CCW_SNID 0x34
#define DASD_ECKD_CCW_RSSD 0x3e
#define DASD_ECKD_CCW_LOCATE_RECORD 0x47
#define DASD_ECKD_CCW_SNSS 0x54