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| author | Jan Höppner <hoeppner@linux.ibm.com> | 2018-07-23 11:13:30 +0200 |
|---|---|---|
| committer | Vasily Gorbik <gor@linux.ibm.com> | 2019-07-11 20:39:54 +0200 |
| commit | 91dc4a197569230683ca8bad551e655a4bf14c30 (patch) | |
| tree | 4cd4647b811278f165405a7eef4df952810be45c /drivers/s390/block/dasd_int.h | |
| parent | bcf36768ea688e926b04639c88c77d8caea3b736 (diff) | |
| download | linux-91dc4a197569230683ca8bad551e655a4bf14c30.tar.gz | |
s390/dasd: Add new ioctl to release space
Userspace tools might have the need to release space for Extent Space
Efficient (ESE) volumes when working with such a device.
Provide the necessarry interface for such a task by implementing a new
ioctl BIODASDRAS. The ioctl uses the format_data_t data structure for
data input:
typedef struct format_data_t {
unsigned int start_unit; /* from track */
unsigned int stop_unit; /* to track */
unsigned int blksize; /* sectorsize */
unsigned int intensity;
} format_data_t;
If the intensity is set to 0x40, start_unit and stop_unit are ignored
and space for the entire volume is released. Otherwise, if intensity is
set to 0, the respective range is released (if possible).
Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>
Reviewed-by: Stefan Haberland <sth@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Diffstat (limited to 'drivers/s390/block/dasd_int.h')
| -rw-r--r-- | drivers/s390/block/dasd_int.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/s390/block/dasd_int.h b/drivers/s390/block/dasd_int.h index 9a8ef372535b04..7fe0c6b9d9ef41 100644 --- a/drivers/s390/block/dasd_int.h +++ b/drivers/s390/block/dasd_int.h @@ -376,6 +376,7 @@ struct dasd_discipline { int (*space_allocated)(struct dasd_device *); int (*space_configured)(struct dasd_device *); int (*logical_capacity)(struct dasd_device *); + int (*release_space)(struct dasd_device *, struct format_data_t *); /* Extent Pool */ int (*ext_pool_id)(struct dasd_device *); int (*ext_size)(struct dasd_device *); |