Hi Pavel, > The behaviour is controlled by setting sqe->file_index, where 0 implies > the old behaviour. If non-zero value is specified, then it will behave > as described and place the file into a fixed file slot > sqe->file_index - 1. A file table should be already created, the slot > should be valid and empty, otherwise the operation will fail. > > Note 1: we can't use IOSQE_FIXED_FILE to switch between modes, because > accept takes a file, and it already uses the flag with a different > meaning. Would it be hard to support IOSQE_FIXED_FILE for the dirfd of openat*, renameat, unlinkat, statx? (And mkdirat, linkat, symlinkat when they arrive) renameat and linkat might be trickier as they take two dirfds, but it would make the feature more complete and useful. metze
