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| author | Stefan Haberland <sth@linux.ibm.com> | 2023-04-05 16:20:14 +0200 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2023-04-11 19:53:08 -0600 |
| commit | bdac94e29564bab9f24c2700f16ff11f31af7c11 (patch) | |
| tree | 241be86af94c770ce65687c4901169610adb2c92 /drivers/s390/block/dasd_devmap.c | |
| parent | 9558a8e9d4a681e67b3abe9cabf3e3d8825af57e (diff) | |
| download | linux-bdac94e29564bab9f24c2700f16ff11f31af7c11.tar.gz | |
s390/dasd: add aq_requeue sysfs attribute
Add a sysfs attribute to control if all IO requests will be requeued to
the blocklayer in case of an autoquiesce event or not.
A value of 1 means that in case of an autoquiesce event all IO requests
will be requeued to the blocklayer.
A value of 0 means that the device will only be stopped.
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/20230405142017.2446986-5-sth@linux.ibm.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'drivers/s390/block/dasd_devmap.c')
| -rw-r--r-- | drivers/s390/block/dasd_devmap.c | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/drivers/s390/block/dasd_devmap.c b/drivers/s390/block/dasd_devmap.c index c7c948c5576114..95c7959c7949b5 100644 --- a/drivers/s390/block/dasd_devmap.c +++ b/drivers/s390/block/dasd_devmap.c @@ -1518,6 +1518,41 @@ static ssize_t dasd_aq_mask_store(struct device *dev, struct device_attribute *a static DEVICE_ATTR(aq_mask, 0644, dasd_aq_mask_show, dasd_aq_mask_store); /* + * aq_requeue controls if requests are returned to the blocklayer on quiesce + * or if requests are only not started + */ +static ssize_t dasd_aqr_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct dasd_devmap *devmap; + int flag; + + devmap = dasd_find_busid(dev_name(dev)); + if (!IS_ERR(devmap)) + flag = (devmap->features & DASD_FEATURE_REQUEUEQUIESCE) != 0; + else + flag = (DASD_FEATURE_DEFAULT & + DASD_FEATURE_REQUEUEQUIESCE) != 0; + return sysfs_emit(buf, "%d\n", flag); +} + +static ssize_t dasd_aqr_store(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + bool val; + int rc; + + if (kstrtobool(buf, &val)) + return -EINVAL; + + rc = dasd_set_feature(to_ccwdev(dev), DASD_FEATURE_REQUEUEQUIESCE, val); + + return rc ? : count; +} + +static DEVICE_ATTR(aq_requeue, 0644, dasd_aqr_show, dasd_aqr_store); + +/* * expiration time for default requests */ static ssize_t @@ -2367,6 +2402,7 @@ static struct attribute * dasd_attrs[] = { &dev_attr_copy_role.attr, &dev_attr_ping.attr, &dev_attr_aq_mask.attr, + &dev_attr_aq_requeue.attr, NULL, }; |