kernel/linux.git/drivers/s390/block/dasd_devmap.c, branch v5.15.208

s390/dasd: add copy pair setup

2024-03-26T22:21:14+00:00

[ Upstream commit a91ff09d39f9b6545254839ac91f1ff7bd21d39e ] A copy relation that is configured on the storage server side needs to be enabled separately in the device driver. A sysfs interface is created that allows userspace tooling to control such setup. The following sysfs entries are added to store and read copy relation information: copy_pair - Add/Delete a copy pair relation to the DASD device driver - Query all previously added copy pair relations copy_role - Query the copy pair role of the device To add a copy pair to the DASD device driver it has to be specified through the sysfs attribute copy_pair. Only one secondary device can be specified at a time together with the primary device. Both, secondary and primary can be used equally to define the copy pair. The secondary devices have to be offline when adding the copy relation. The primary device needs to be specified first followed by the comma separated secondary device. Read from the copy_pair attribute to get the current setup and write "clear" to the attribute to delete any existing setup. Example: $ echo 0.0.9700,0.0.9740 > /sys/bus/ccw/devices/0.0.9700/copy_pair $ cat /sys/bus/ccw/devices/0.0.9700/copy_pair 0.0.9700,0.0.9740 During device online processing the required data will be read from the storage server and the information will be compared to the setup requested through the copy_pair attribute. The registration of the primary and secondary device will be handled accordingly. A blockdevice is only allocated for copy relation primary devices. To query the copy role of a device read from the copy_role sysfs attribute. Possible values are primary, secondary, and none. Example: $ cat /sys/bus/ccw/devices/0.0.9700/copy_role primary Signed-off-by: Stefan Haberland Reviewed-by: Jan Hoeppner Link: https://lore.kernel.org/r/20220920192616.808070-4-sth@linux.ibm.com Signed-off-by: Jens Axboe Stable-dep-of: c3116e62ddef ("s390/dasd: fix double module refcount decrement") Signed-off-by: Sasha Levin

s390/dasd: let driver core manage the sysfs attributes

2021-03-16T14:31:00+00:00

Wire up device_driver->dev_groups, so that really_probe() creates the sysfs attributes for us automatically. Signed-off-by: Julian Wiedmann Reviewed-by: Jan Hoeppner Signed-off-by: Stefan Haberland Link: https://lore.kernel.org/r/20210316094513.2601218-3-sth@linux.ibm.com Signed-off-by: Jens Axboe

s390/dasd: Fix inconsistent kobject removal

2021-01-25T16:22:16+00:00

Our intention was to only remove path kobjects whenever a device is being set offline. However, one corner case was missing. If a device is disabled and enabled (using the IOCTLs BIODASDDISABLE and BIODASDENABLE respectively), the enabling process will call dasd_eckd_reload_device() which itself calls dasd_eckd_read_conf() in order to update path information. During that update, dasd_eckd_clear_conf_data() clears all old data and also removes all kobjects. This will leave us with an inconsistent state of path kobjects and a subsequent path verification leads to a failing kobject creation. Fix this by removing kobjects only in the context of offlining a device as initially intended. Fixes: 19508b204740 ("s390/dasd: Display FC Endpoint Security information via sysfs") Reported-by: Stefan Haberland Signed-off-by: Jan Höppner Reviewed-by: Stefan Haberland Reviewed-by: Cornelia Huck Signed-off-by: Jens Axboe

s390/dasd: Display FC Endpoint Security information via sysfs

2020-11-16T15:14:38+00:00

Add a new sysfs attribute (fc_security) per device and per operational channel path. The information of the current FC Endpoint Security state is received through the CIO layer. The state of the FC Endpoint Security can be either "Unsupported", "Authentication", or "Encryption". For example: $ cat /sys/bus/ccw/devices/0.0.c600/fc_security Encryption If any of the operational paths is in a state different from all others, the device sysfs attribute will display the additional state "Inconsistent". The sysfs attributes per paths are organised in a new directory called "paths_info" with subdirectories for each path. /sys/bus/ccw/devices/0.0.c600/paths_info/ ├── 0.38 │ └── fc_security ├── 0.39 │ └── fc_security ├── 0.3a │ └── fc_security └── 0.3b └── fc_security Signed-off-by: Jan Höppner Signed-off-by: Stefan Haberland Reviewed-by: Stefan Haberland Reviewed-by: Cornelia Huck Signed-off-by: Jens Axboe

s390/dasd: Recognise data for ESE volumes

2019-07-11T18:39:53+00:00

In order to work with Extent Space Efficient (ESE) volumes, certain viable information about those volumes and the corresponding extent pool (such as extent size, configured space, allocated space, etc.) can be provided. Use the CCW commands Volume Storage Query and Logical Configuration Query to receive detailed information about ESE volumes and the extent pool respectively. These information are made accessible via internal functions for subsequent users, and via sysfs attributes for userpsace usage. The new sysfs attributes reside in separate directories called capacity and extent_pool. attributes: ese: 0/1 depending on whether the volume is an ESE volume Capacity related attributes: space_allocated: Space currently allocated by the volume (in cyl) space_configured: Remaining space in the extent pool (in cyl) logical_capacity: The entire addressable space for this volume (in cyl) Extent Pool related attributes: pool_id: ID of the extent pool the volume in question resides in pool_oos: Extent pool is out-of-space extent_size: Size of a single extent in this pool cap_at_warnlevel Extent pool capacity at warn level warn_threshold: Threshold at which percentage of remaining extent pool space a warning message is issued Signed-off-by: Jan Höppner Reviewed-by: Stefan Haberland Signed-off-by: Vasily Gorbik

s390/dasd: Fix a precision vs width bug in dasd_feature_list()

2019-07-02T14:00:26+00:00

The "len" variable is the length of the option up to the next option or to the end of the string which ever first. We want to print the invalid option so we want precision "%.*s" but the format is width "%*s" so it prints up to the end of the string. Signed-off-by: Dan Carpenter Tested-by: Stefan Haberland Signed-off-by: Stefan Haberland Signed-off-by: Vasily Gorbik

s390/dasd,zfcp: fix gcc 8 stringop-truncation warnings

2018-07-02T09:24:52+00:00

ccw "busid" should always be NUL-terminated, as evident from e.g. get_ccwdev_by_busid doing "return (strcmp(bus_id, dev_name(dev)) == 0)". Replace all strncpy initializing busid with strlcpy. This fixes the following gcc 8 warnings: drivers/s390/scsi/zfcp_aux.c:104:2: warning: 'strncpy' specified bound 20 equals destination size [-Wstringop-truncation] strncpy(busid, token, ZFCP_BUS_ID_SIZE); drivers/s390/block/dasd_eer.c:316:2: warning: 'strncpy' specified bound 10 equals destination size [-Wstringop-truncation] strncpy(header.busid, dev_name(&device->cdev->dev), DASD_EER_BUSID_SIZE); drivers/s390/block/dasd_eer.c:359:2: warning: 'strncpy' specified bound 10 equals destination size [-Wstringop-truncation] strncpy(header.busid, dev_name(&device->cdev->dev), DASD_EER_BUSID_SIZE); drivers/s390/block/dasd_devmap.c:429:3: warning: 'strncpy' specified bound 20 equals destination size [-Wstringop-truncation] strncpy(new->bus_id, bus_id, DASD_BUS_ID_SIZE); Acked-by: Stefan Haberland Acked-by: Steffen Maier Reviewed-by: Heiko Carstens Signed-off-by: Vasily Gorbik Signed-off-by: Martin Schwidefsky

s390/dasd: configurable IFCC handling

2018-02-22T14:31:23+00:00

Make the behavior in case of constant IFCC/CCC errors configurable. Add a sysfs attribute to switch between path disabled after threshold exceeded (default) and message only. Reviewed-by: Jan Hoeppner Reviewed-by: Sebastian Ott Signed-off-by: Stefan Haberland Signed-off-by: Martin Schwidefsky

s390: block: add SPDX identifiers to the remaining files

2017-11-24T13:28:37+00:00

It's good to have SPDX identifiers in all files to make it easier to audit the kernel tree for correct licenses. Update the drivers/s390/block/ files with the correct SPDX license identifier based on the license text in the file itself. The SPDX identifier is a legally binding shorthand, which can be used instead of the full boiler plate text. This work is based on a script and data from Thomas Gleixner, Philippe Ombredanne, and Kate Stewart. Cc: Stefan Haberland Cc: Jan Hoeppner Cc: Martin Schwidefsky Cc: Heiko Carstens Cc: Thomas Gleixner Cc: Kate Stewart Cc: Philippe Ombredanne Signed-off-by: Greg Kroah-Hartman Signed-off-by: Heiko Carstens Signed-off-by: Martin Schwidefsky

s390/dasd: blk-mq conversion

2017-09-08T13:31:08+00:00

Use new blk-mq interfaces. Use multiple queues and also use the block layer complete helper that finish the IO on the CPU that initiated it. Reviewed-by: Jan Hoeppner Signed-off-by: Stefan Haberland Signed-off-by: Martin Schwidefsky