f2fs_io(8) System Administration Utilities f2fs_io(8) (NAME) f2fs_io - ioctl f2fs (DESCRIPTION) f2fs_io f2fs . (AVAILABLE COMMANDS) set_verity [file] verity . getflags [file] . setflags [flag] [file] f2fs . casefold compression nocompression . shutdown shutdown filesystem / dir. : 0 (full sync) 1 (checkpoint only) 2 (no sync) 3 (metadata flush) 4 fsck pinfile [get|set] [file] . fallocate [keep_size] [offset] [length] [file] . keep_size 1 0 . write [chunk_size in 4kb] [offset in chunk_size] [count] [pattern] [IO] [file_path] file_path. pattern : zero inc_num rand IO : buffered / (buffered I/O) dio / (direct I/O) dsync / O_DSYNC read [chunk_size in 4kb] [offset in chunk_size] [count] [IO] [print_nbytes] [file_path] file_path print_nbytes. IO : buffered / (buffered I/O) dio / (direct I/O) fiemap [offset in 4kb] [count] [file_path] gc_urgent dev [start|end|run] [time in sec] gc_urgent defrag_file [start] [length] [file_path] . copy [-d] [-m] [-s] [src_path] [dst_path] src_path dst_path. pattern : -d / (direct I/O) -m mmap -s sendfile get_cblocks [file] . release_cblocks [file] . reserve_cblocks [file] . gc [sync_mode] [file] (filesystem GC) (AUTHOR) f2fs_io Jaegeuk Kim . (AVAILABILITY) f2fs_io : git://git.kernel.org/pub/scm/linux/kernel/git/jaegeuk/f2fs- tools.git f2fs-tools March 2020 f2fs_io(8)