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s390/dasd: add autoquiesce feature

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Add the internal logic to check for autoquiesce triggers and handle
them.

Quiesce and resume are functions that tell Linux to stop/resume
issuing I/Os to a specific DASD.
The DASD driver allows a manual quiesce/resume via ioctl.

Autoquiesce will define an amount of triggers that will lead to
an automatic quiesce if a certain event occurs.
There is no automatic resume.

All events will be reported via DASD Extended Error Reporting (EER)
if configured.

Signed-off-by: Stefan Haberland <sth@linux.ibm.com>
Reviewed-by: Jan Hoeppner <hoeppner@linux.ibm.com>
Reviewed-by: Halil Pasic <pasic@linux.ibm.com>
Link: https://lore.kernel.org/r/20230405142017.2446986-3-sth@linux.ibm.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Stefan Haberland
2023-04-05 16:20:12 +02:00
committed by Jens Axboe
parent 861d53dbed
commit 1cee2975bb
4 changed files with 48 additions and 17 deletions
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2
arch/s390/include/uapi/asm/dasd.h
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@@ -78,6 +78,7 @@ typedef struct dasd_information2_t {
* 0x040: give access to raw eckd data
* 0x080: enable discard support
* 0x100: enable autodisable for IFCC errors (default)
* 0x200: enable requeue of all requests on autoquiesce
*/
#define DASD_FEATURE_READONLY 0x001
#define DASD_FEATURE_USEDIAG 0x002
@@ -88,6 +89,7 @@ typedef struct dasd_information2_t {
#define DASD_FEATURE_USERAW 0x040
#define DASD_FEATURE_DISCARD 0x080
#define DASD_FEATURE_PATH_AUTODISABLE 0x100
#define DASD_FEATURE_REQUEUEQUIESCE 0x200
#define DASD_FEATURE_DEFAULT DASD_FEATURE_PATH_AUTODISABLE
#define DASD_PARTN_BITS 2