[[PageOutline]] == Migrate old os_''youros''.cpp to new class interface == Christian Franke wrote this quick outline how a migration works, which he already tested with os_linux.cpp. === Step 1: Move adapter classes into os_''youros''.cpp === * Append adapter classes to old module: {{{ #!sh $ cat dev_legacy.cpp >> os_youros.cpp [[code]] - Re-configure, this should now detect new interface: [[code format="bash"]] $ ./configure ... checking whether os_youros.cpp uses new interface... yes }}} * This should compile and work! * Move #includes to top, remove duplicates. * Remove all dummy functions for controllers not supported on your os (marvell_command_interface, ...). * Remove corresponding classes (e.g legacy_marvell_device, ...). * Remove corresponding section from legacy_smart_interface::get_custom_smart_device(). If nothing left, remove this function. * Rename remaining classes 'legacy_*' to 'youros_*'. Rename namespace 'os' to 'os_youros'. * This should compile and work! === Step 2: Merge old functions into class member functions === '''Old:''' {{{ #!c int deviceopen(const char *pathname, char *type) { ... int fd = open(pathname, ...); ... return fd; } bool youros_smart_device::open() { m_fd = ::deviceopen(get_dev_name(), (char*)m_mode); if (m_fd < 0) { set_err(errno); return false; } return true; } }}} '''New:''' {{{ #!cpp bool youros_smart_device::open() { ... m_fd = open(get_dev_name(), ...); if (m_fd < 0) { set_err(errno); return false; } return true; } }}} '''Old:''' {{{ #!c int ata_command_interface(int fd, smart_command_set command, int select, char *data) { ... if (ioctl(fd, ...)) return -1; ... return 0; } int youros_ata_device::ata_command_interface(smart_command_set command, int select, char * data) { return ::ata_command_interface(get_fd(), command, select, data); } }}} '''New:''' {{{ #!cpp int youros_ata_device::ata_command_interface(smart_command_set command, int select, char * data) { ... if (ioctl(get_fd(), ...)) return -1; ... return 0; } }}} === Step 3: Convert SMART-only to full fledged ATA pass through === * Change base class of 'youros_ata_device' from 'ata_device_with_command_set' to 'ata_device'. * Change 'youros_ata_device::ata_command_interface()' to 'youros_ata_device::ata_pass_through()'. * Add parameter check using ata_cmd_is_ok(in, 'supported features') * Remove 'switch (command) {....}', set ioctl input struct directly from input registers e.g. 'in.in_regs.*'. * Remove special handling for SMART STATUS, return result registers in 'out.out_regs' if requested by 'in.out_needed.is_set()'. * Adjust returns: {{{ Replace 'return 0;' by 'return true;'. Replace 'errno = ERR; return -1;' by 'return set_err(ERR, "optional message", ...)'. }}} * Optional add 48bit ATA pass through support: {{{ If 'in.in_regs.is_48bit_cmd()' is set, pass low (in.in_regs.lba_mid) and high (in.in_regs.prev.lba_mid) byte of each register to ioctl. }}} === Later === * Rework device scanning. * Add/Rework auto-detection (function autodetect_open()). * remove os_youros.h, each module does only export smart_interface::init(). === Example for Steps 1+2: === http://smartmontools.cvs.sourceforge.net/viewvc/smartmontools/sm5/os_linux.cpp?r1=1.116&r2=1.117 === Example for Step 3 (3ware only): === http://smartmontools.cvs.sourceforge.net/viewvc/smartmontools/sm5/os_linux.cpp?r1=1.117&r2=1.118