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device: Tidy DASD CDL format detection code.

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This commit is contained in:
Alasdair G Kergon 2015-10-27 15:27:52 +00:00
parent 6e1e0e8813
commit 65ec00ce20
1 changed files with 60 additions and 23 deletions
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83
lib/device/dev-dasd.c
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@ -17,7 +17,28 @@
#include "dev-type.h"
#include <sys/ioctl.h>
typedef struct dasd_information_t {
#ifdef __linux__
/*
* Interface taken from kernel header arch/s390/include/uapi/asm/dasd.h
*/
/*
* Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
* Copyright IBM Corp. 1999, 2000
* EMC Symmetrix ioctl Copyright EMC Corporation, 2008
* Author.........: Nigel Hislop <hislop_nigel@emc.com>
*/
#define DASD_IOCTL_LETTER 'D'
#define DASD_API_VERSION 6
/*
* struct dasd_information2_t
* represents any data about the device, which is visible to userspace.
* including foramt and featueres.
*/
typedef struct dasd_information2_t {
unsigned int devno; /* S/390 devno */
unsigned int real_devno; /* for aliases */
unsigned int schid; /* S/390 subchannel identifier */
@ -34,41 +55,57 @@ typedef struct dasd_information_t {
unsigned int FBA_layout; /* fixed block size (like AIXVOL) */
unsigned int characteristics_size;
unsigned int confdata_size;
unsigned char characteristics[64];/*from read_device_characteristics */
unsigned char configuration_data[256];/*from read_configuration_data */
char characteristics[64]; /* from read_device_characteristics */
char configuration_data[256]; /* from read_configuration_data */
unsigned int format; /* format info like formatted/cdl/ldl/... */
unsigned int features; /* dasd features like 'ro',... */
unsigned int reserved0; /* reserved for further use ,... */
unsigned int reserved1; /* reserved for further use ,... */
unsigned int reserved2; /* reserved for further use ,... */
unsigned int reserved3; /* reserved for further use ,... */
unsigned int reserved4; /* reserved for further use ,... */
unsigned int reserved5; /* reserved for further use ,... */
unsigned int reserved6; /* reserved for further use ,... */
unsigned int reserved7; /* reserved for further use ,... */
} dasd_information_t;
unsigned int features; /* dasd features like 'ro',... */
unsigned int reserved0; /* reserved for further use ,... */
unsigned int reserved1; /* reserved for further use ,... */
unsigned int reserved2; /* reserved for further use ,... */
unsigned int reserved3; /* reserved for further use ,... */
unsigned int reserved4; /* reserved for further use ,... */
unsigned int reserved5; /* reserved for further use ,... */
unsigned int reserved6; /* reserved for further use ,... */
unsigned int reserved7; /* reserved for further use ,... */
} dasd_information2_t;
#define DASD_FORMAT_CDL 2
#define BIODASDINFO2 _IOR('D', 3, dasd_information_t)
#define DASD_FORMAT_CDL 2
/* Get information on a dasd device (enhanced) */
#define BIODASDINFO2 _IOR(DASD_IOCTL_LETTER,3,dasd_information2_t)
/*
* End of included interface.
*/
int dasd_is_cdl_formatted(struct device *dev)
{
int ret = 0;
dasd_information_t dasd_info;
dasd_information2_t dasd_info2;
if (!dev_open_readonly(dev)) {
stack;
return ret;
if (!dev_open_readonly(dev))
return_0;
if (ioctl(dev->fd, BIODASDINFO2, &dasd_info2)) {
log_sys_error("ioctl BIODASDINFO2", dev_name(dev));
goto out;
}
if (ioctl(dev->fd, BIODASDINFO2, &dasd_info) != 0)
goto_out;
if (dasd_info.format == DASD_FORMAT_CDL)
if (dasd_info2.format == DASD_FORMAT_CDL)
ret = 1;
out:
if (!dev_close(dev))
stack;
return ret;
}
#else
int dasd_is_cdl_formatted(struct device *dev)
{
return 0;
}
#endif