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| author | Jan Höppner <hoeppner@linux.ibm.com> | 2018-07-23 12:13:30 +0300 |
|---|---|---|
| committer | Vasily Gorbik <gor@linux.ibm.com> | 2019-07-11 21:39:54 +0300 |
| commit | 91dc4a197569230683ca8bad551e655a4bf14c30 (patch) | |
| tree | 4cd4647b811278f165405a7eef4df952810be45c /drivers/s390/block/dasd_eckd.h | |
| parent | bcf36768ea688e926b04639c88c77d8caea3b736 (diff) | |
| download | linux-91dc4a197569230683ca8bad551e655a4bf14c30.tar.xz | |
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_eckd.h')
| -rw-r--r-- | drivers/s390/block/dasd_eckd.h | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/drivers/s390/block/dasd_eckd.h b/drivers/s390/block/dasd_eckd.h index bc5998068ddf..4226936427ec 100644 --- a/drivers/s390/block/dasd_eckd.h +++ b/drivers/s390/block/dasd_eckd.h @@ -50,6 +50,10 @@ #define DASD_ECKD_CCW_PFX_READ 0xEA #define DASD_ECKD_CCW_RSCK 0xF9 #define DASD_ECKD_CCW_RCD 0xFA +#define DASD_ECKD_CCW_DSO 0xF7 + +/* Define Subssystem Function / Orders */ +#define DSO_ORDER_RAS 0x81 /* * Perform Subsystem Function / Orders @@ -513,6 +517,42 @@ struct dasd_psf_ssc_data { unsigned char reserved[59]; } __attribute__((packed)); +/* Maximum number of extents for a single Release Allocated Space command */ +#define DASD_ECKD_RAS_EXTS_MAX 110U + +struct dasd_dso_ras_ext_range { + struct ch_t beg_ext; + struct ch_t end_ext; +} __packed; + +/* + * Define Subsytem Operation - Release Allocated Space + */ +struct dasd_dso_ras_data { + __u8 order; + struct { + __u8 message:1; /* Must be zero */ + __u8 reserved1:2; + __u8 vol_type:1; /* 0 - CKD/FBA, 1 - FB */ + __u8 reserved2:4; + } __packed flags; + /* Operation Flags to specify scope */ + struct { + __u8 reserved1:2; + /* Release Space by Extent */ + __u8 by_extent:1; /* 0 - entire volume, 1 - specified extents */ + __u8 guarantee_init:1; + __u8 force_release:1; /* Internal - will be ignored */ + __u16 reserved2:11; + } __packed op_flags; + __u8 lss; + __u8 dev_addr; + __u32 reserved1; + __u8 reserved2[10]; + __u16 nr_exts; /* Defines number of ext_scope - max 110 */ + __u16 reserved3; +} __packed; + /* * some structures and definitions for alias handling |