path: root/arch/s390/include/uapi/asm/dasd.h
diff options
authorJan Höppner <hoeppner@linux.ibm.com>2018-07-23 11:13:30 +0200
committerVasily Gorbik <gor@linux.ibm.com>2019-07-11 20:39:54 +0200
commit91dc4a197569230683ca8bad551e655a4bf14c30 (patch)
tree4cd4647b811278f165405a7eef4df952810be45c /arch/s390/include/uapi/asm/dasd.h
parentbcf36768ea688e926b04639c88c77d8caea3b736 (diff)
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/include/uapi/asm/dasd.h')
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)

Privacy Policy