linux-stable.git/drivers/s390/block/dasd_devmap.c, branch linux-5.14.y

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

s390/dasd: Add discard support for FBA devices

2017-08-29T14:31:26+00:00

The z/VM hypervisor provides virtual disks (VDISK) which are backed by
main memory of the hypervisor. Those devices are seen as DASD FBA disks
within the Linux guest.

Whenever data is written to such a device, memory is allocated
on-the-fly by z/VM accordingly. This memory, however, is not being freed
if data on the device is deleted by the guest OS.

In order to make memory usable after deletion again, add discard support
to the FBA discipline.

While at it, update comments regarding the DASD_FEATURE_* flags.

Reviewed-by: Stefan Haberland 
Signed-off-by: Jan Höppner 
Signed-off-by: Martin Schwidefsky