Thank you for replying,
I see your good suggestion by using lseek, but I still don’t know how to use it
to calculate these LBAs in OpenSolarisX system file.
The following function that I am trying to port to OpenSolarisX ZFS is finding
a range of start and end physical unit LBAs by given file and its offset bytes.
I call send you this function codes, it is about more one paper page long.
void TWL_File_LBA::get_unit_lba_range(char *file_name,
ULONGLONG byte_offset,
ULONGLONG record_length,
ULONGLONG &range_start_unit_lba,
ULONGLONG &range_end_unit_lba,
ULONGLONG &run_length)
In the code (linux), it mainly used
if (-1 == ioctl(fileFD, FIGETBSZ, &FsBlockSize))
if (-1 == ioctl(fileFD, FIBMAP, &FsBlockAtOffset))
to find out the FsBlockAtOffset, then used it to calculate begin and end unit
LBAs.
Thank you very much for your time.
Thai.
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