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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 /arch/s390 | |
| parent | s390/dasd: Add dasd_sleep_on_queue_interruptible() (diff) | |
| download | linux-91dc4a197569230683ca8bad551e655a4bf14c30.tar.xz linux-91dc4a197569230683ca8bad551e655a4bf14c30.zip | |
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 'arch/s390')
| -rw-r--r-- | arch/s390/include/uapi/asm/dasd.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/s390/include/uapi/asm/dasd.h b/arch/s390/include/uapi/asm/dasd.h index 48a2f475b90a..9ec86fae9980 100644 --- a/arch/s390/include/uapi/asm/dasd.h +++ b/arch/s390/include/uapi/asm/dasd.h @@ -194,6 +194,7 @@ typedef struct format_data_t { #define DASD_FMT_INT_INVAL 4 /* invalidate tracks */ #define DASD_FMT_INT_COMPAT 8 /* use OS/390 compatible disk layout */ #define DASD_FMT_INT_FMT_NOR0 16 /* remove permission to write record zero */ +#define DASD_FMT_INT_ESE_FULL 32 /* release space for entire volume */ /* * struct format_check_t @@ -323,6 +324,8 @@ struct dasd_snid_ioctl_data { #define BIODASDFMT _IOW(DASD_IOCTL_LETTER,1,format_data_t) /* Set Attributes (cache operations) */ #define BIODASDSATTR _IOW(DASD_IOCTL_LETTER,2,attrib_data_t) +/* Release Allocated Space */ +#define BIODASDRAS _IOW(DASD_IOCTL_LETTER, 3, format_data_t) /* Get Sense Path Group ID (SNID) data */ #define BIODASDSNID _IOWR(DASD_IOCTL_LETTER, 1, struct dasd_snid_ioctl_data) |