4.1 Get_resources request processing

Function int get_resources(struct resources *res,ERR_PARAM) takes pointer to the allocated structure struct resources and fills it in with information about hard disks in the computer and their partition structure. The function processes in several steps:

• Global conversion parameters are duplicated and stored in rs_parcount and rs_pars.
• Parameters of supported filesystems are duplicated and stored in rs_fstypes and rs_fspars.
• The hard drives in the computer are detected; the results of detection are stored in array exist. The detection of presence of drives is done by calling function int try_device(char *devicename). This function returns one if the device named devicename is present in the computer and zero otherwise.
• rs_diskcount is filled and memory for rs_disks is allocated.
• Function int fill_disk(char *devicename,struct disk_info *diskinfo,struct fs_pars *filesystems,ERR_PARAM) is called to obtain information about all detected drives.
• ID numbers (di_disk and ud_part) of disks, partitions and directories are filled.

The function int fill_disk(char *devicename,struct disk_info *diskinfo,struct fs_pars *filesystems,ERR_PARAM) obtains information about partition structure on device named devicename and fills in structure diskinfo using filesystem parameters stored in filesystem. The function processes in several steps:

• The geometry of device named devicename is detected and filled in structure diskinfo.
• Disk parameters are duplicated and stored in structure diskinfo in di_parcount and di_pars.
• The function read_partition of Partitioner module is called. This function fills in structure diskinfo information about partition structure of the device.
• The function fc_identify is called for each found partition on the device and for all known filesystems. If any of filesystems is detected, its function fc_getparams is called and this function fills in the filesystem parameters. If any of the filesystem is successfully detected the detection process is aborted and the functions fc_identify of other filesystems are not called. The filesystems are detected in decreasing order as they are stored in array regfs. The last filesystem (regfs[0]) should be `unknown filesystem' which detection is always positive.