LOOP_CONFIGURE is added to Linux 5.8 This allows userspace to completely setup a loop device with a single ioctl, removing the in-between state where the device can be partially configured - eg the loop device has a backing file associated with it, but is reading from the wrong offset.
https://lwn.net/Articles/820408/ https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=3448914e8cc5 To facilitate the addition of new functions, the code of set_loop() is micro-refactored. LINUX_VERSION_CODE >= KERNEL_VERSION(5,8,0): function old new delta set_loop 760 626 -134 ------------------------------------------------------------------------------ (add/remove: 0/0 grow/shrink: 0/1 up/down: 0/-134) Total: -134 bytes else function old new delta set_loop 760 703 -57 ------------------------------------------------------------------------------ (add/remove: 0/0 grow/shrink: 0/1 up/down: 0/-57) Total: -57 bytes ---- Xiaoming Ni (9): loop:refactor: extract subfunction open_file() loop:refactor: extract subfunction get_next_free_loop() loop:refactor: del close_and_try_next_loopN loop:refactor: extract subfunction set_loop_info() loop:refactor: extract subfunction set_loop_configure() loop:refactor: Use a structure to reduce parameters loop:refactor: Extract subfunction do_stat_and_mknod() loop:refactor: extract subfunction set_loop_dev() loop: Add LOOP_CONFIGURE ioctl libbb/loop.c | 275 +++++++++++++++++++++++++++++++-------------------- 1 file changed, 170 insertions(+), 105 deletions(-) -- 2.27.0 _______________________________________________ busybox mailing list [email protected] http://lists.busybox.net/mailman/listinfo/busybox
