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>
diff --git a/drivers/s390/block/dasd_eckd.h b/drivers/s390/block/dasd_eckd.h
index bc59980..4226936 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
