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tunedasd: add copy_pair swap capability

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Add an option to tunedasd to trigger a copy pair swap using the appropriate
ioctl for DASD devices.

      -s, --copy-pair-swap COPY_PAIR

This command requires a comma separated pair of primary,secondary to be
specified. In case of success the old secondary will become the new primary
device and the old primary will become a secondary device.

Example:

tunedasd /dev/dasda -s 0.0.9700,0.0.9740

This will set the old secondary device 0.0.9740 as the new primary.
The old primary device 0.0.9700 will automatically become a secondary
device.

Signed-off-by: Stefan Haberland <sth@linux.ibm.com>
Reviewed-by: Jan Hoeppner <hoeppner@linux.ibm.com>
Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>
This commit is contained in:
Stefan Haberland
2022-11-11 13:17:32 +01:00
committed by Jan Höppner
parent 3aa7f6e298
commit 3f12bdf4c7
6 changed files with 138 additions and 26 deletions
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include/lib/dasd_base.h
+12 -2
View File
@@ -20,8 +20,8 @@
#include <stdio.h>
#include <sys/ioctl.h>
/* A bus id of a DASD is 8 characters long. E.g. 0.0.4711 */
#define DASD_BUS_ID_SIZE 9
/* the definition of a BUSID in the DASD driver is 20 */
#define DASD_BUS_ID_SIZE 20
typedef struct dasd_information2_t {
unsigned int devno; /* S/390 devno */
@@ -242,6 +242,13 @@ struct dasd_snid_ioctl_data {
__u8 path_mask;
} __attribute__((packed));
struct dasd_copypair_swap_data {
char primary[DASD_BUS_ID_SIZE]; /* BUSID of primary */
char secondary[DASD_BUS_ID_SIZE]; /* BUSID of secondary */
/* Reserved for future updates. */
char reserved[64];
};
#ifndef __linux__
/* definition from hdreg.h */
struct hd_geometry {
@@ -278,6 +285,8 @@ struct hd_geometry {
#define BIODASDSATTR _IOW(DASD_IOCTL_LETTER, 2, attrib_data_t)
/* Release Allocated Space */
#define BIODASDRAS _IOW(DASD_IOCTL_LETTER, 3, format_data_t)
/* Swap copy pair */
#define BIODASDPPRCSWAP _IOW(DASD_IOCTL_LETTER, 4, struct dasd_copypair_swap_data)
/* Get Sense Path Group ID (SNID) data */
#define BIODASDSNID _IOWR(DASD_IOCTL_LETTER, 1, struct dasd_snid_ioctl_data)
/* Check device format according to format_data_t */
@@ -318,5 +327,6 @@ int dasd_set_cache(const char *device, attrib_data_t *attrib_data);
int dasd_query_reserve(const char *device);
int dasd_profile(const char *device, dasd_profile_info_t *dasd_profile_info);
int dasd_reset_profile(const char *device);
int dasd_copy_swap(const char *device, struct dasd_copypair_swap_data *data);
#endif /* LIB_DASD_BASE_H */