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utils: Add a helper to get the device name that sg device mapped to
E.g. % sg_map /dev/sg0 /dev/sda /dev/sg1 /dev/sr0 What the helper gets for /dev/sg0 is /dev/sda, it will be used by later patch.
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@ -1730,6 +1730,7 @@ virSCSIDeviceFileIterate;
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virSCSIDeviceFree;
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virSCSIDeviceGetAdapter;
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virSCSIDeviceGetBus;
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virSCSIDeviceGetDevName;
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virSCSIDeviceGetName;
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virSCSIDeviceGetReadonly;
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virSCSIDeviceGetSgName;
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@ -142,6 +142,53 @@ cleanup:
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return sg;
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}
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/* Returns device name (e.g. "sdc") on success, or NULL
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* on failure.
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*/
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char *
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virSCSIDeviceGetDevName(const char *adapter,
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unsigned int bus,
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unsigned int target,
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unsigned int unit)
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{
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DIR *dir = NULL;
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struct dirent *entry;
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char *path = NULL;
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char *name = NULL;
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unsigned int adapter_id;
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if (virSCSIDeviceGetAdapterId(adapter, &adapter_id) < 0)
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return NULL;
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if (virAsprintf(&path,
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SYSFS_SCSI_DEVICES "/%d:%d:%d:%d/block",
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adapter_id, bus, target, unit) < 0) {
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virReportOOMError();
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return NULL;
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}
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if (!(dir = opendir(path))) {
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virReportError(VIR_ERR_INTERNAL_ERROR,
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_("Failed to open %s"), path);
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goto cleanup;
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}
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while ((entry = readdir(dir))) {
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if (entry->d_name[0] == '.')
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continue;
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if (!(name = strdup(entry->d_name))) {
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virReportOOMError();
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goto cleanup;
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}
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}
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cleanup:
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closedir(dir);
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VIR_FREE(path);
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return name;
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}
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virSCSIDevicePtr
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virSCSIDeviceNew(const char *adapter,
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unsigned int bus,
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@ -37,6 +37,10 @@ char *virSCSIDeviceGetSgName(const char *adapter,
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unsigned int bus,
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unsigned int target,
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unsigned int unit);
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char *virSCSIDeviceGetDevName(const char *adapter,
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unsigned int bus,
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unsigned int target,
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unsigned int unit);
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virSCSIDevicePtr virSCSIDeviceNew(const char *adapter,
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unsigned int bus,
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