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author | Alasdair G Kergon <agk@redhat.com> | 2015-10-27 15:27:52 +0000 |
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committer | Alasdair G Kergon <agk@redhat.com> | 2015-10-27 15:27:52 +0000 |
commit | 65ec00ce202411f6e6f91955ab9422d44bb86a9b (patch) | |
tree | 0c7737dfb98caff6eed628f19556d1aba32d94d7 | |
parent | 6e1e0e881368be6337599dcf7f627f785ebf415c (diff) | |
download | lvm2-65ec00ce202411f6e6f91955ab9422d44bb86a9b.tar.gz |
device: Tidy DASD CDL format detection code.
-rw-r--r-- | lib/device/dev-dasd.c | 85 |
1 files changed, 61 insertions, 24 deletions
diff --git a/lib/device/dev-dasd.c b/lib/device/dev-dasd.c index 28156ca7f..220293e4a 100644 --- a/lib/device/dev-dasd.c +++ b/lib/device/dev-dasd.c @@ -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; - -#define DASD_FORMAT_CDL 2 -#define BIODASDINFO2 _IOR('D', 3, 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 + +/* 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_info) != 0) - goto_out; + if (ioctl(dev->fd, BIODASDINFO2, &dasd_info2)) { + log_sys_error("ioctl BIODASDINFO2", dev_name(dev)); + 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 |