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libdasd: Provide function to read ese sysfs attribute

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Provide a function to determine whether a DASD is an Extent Space
Efficient (ESE) volume.

Reviewed-by: Stefan Haberland <sth@linux.ibm.com>
Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>
This commit is contained in:
Jan Höppner
2019-03-05 15:31:09 +01:00
parent abc1875300
commit 8023a72b11
2 changed files with 38 additions and 0 deletions
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1
include/lib/dasd_sys.h
View File

@@ -15,6 +15,7 @@
#include <stdio.h> #include <stdio.h>
int dasd_sys_raw_track_access(char *); int dasd_sys_raw_track_access(char *);
int dasd_sys_ese(char *);
int dasd_reset_chpid(char *, char *); int dasd_reset_chpid(char *, char *);
int dasd_get_host_access_count(char *device); int dasd_get_host_access_count(char *device);

37
libdasd/dasd_sys.c
View File

@@ -57,6 +57,43 @@ int dasd_sys_raw_track_access(char *devnode)
return (rc == 1) ? 1 : 0; return (rc == 1) ? 1 : 0;
} }
/**
* Is volume extent space efficient a.k.a. thin-provisioned
*
* The "devnode" parameter can be any valid relative or absolute path to
* a DASD device node, for example:
*
* - /dev/dasda
* - /dev/disk/by-path/ccw-0.0.bf20
*
* @param[in] devnode Device node of interest
*
* @retval 1 Volume is extent space efficient
* @retval 0 Volume is not extent space efficient or
* cannot be determined
*/
int dasd_sys_ese(char *devnode)
{
char busid[DASD_BUS_ID_SIZE];
char *path;
FILE *fp;
int rc;
if (util_sys_get_dev_addr(devnode, busid) != 0)
return 0;
path = util_path_sysfs("bus/ccw/devices/%s/ese", busid);
fp = fopen(path, "r");
if (!fp) {
free(path);
return 0;
}
rc = fgetc(fp) - '0';
fclose(fp);
return (rc == 1) ? 1 : 0;
}
int dasd_get_pm_from_chpid(char *busid, unsigned int chpid, int *mask) int dasd_get_pm_from_chpid(char *busid, unsigned int chpid, int *mask)
{ {