On 8/16/21 4:45 PM, Stefan Metzmacher wrote: > 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. Good idea. There is nothing blocking on the io_uring side, but the fs part may get ugly, e.g. too intrusive. We definitely need to take a look -- Pavel Begunkov
