On Wed, Sep 17, 2014 at 12:05:23PM -0400, Milosz Tanski wrote: > Theodore, > > I might be missing understanding something, but... I already omitted > read2 and write2 which can be implemented in userspace by libc (as you > pointed out). In the case of readv vs. preadv there's an extra > positional argument (file offset) and preadv version doesn't change > the file location. I didn't want to overload the meaning of preadv2 to > take a special negative offset value that uses the current file > position but also changes the file position. off_t has to be signed, so having a magic negative value doesn't bother me that much. Or you could use a flag bitvalue which means to use the fd's offset and to ignore the positional value. (More bike-shedding :-) The main reason why I mention it is we have a huge number of read/write syscalls already, and if we add yet another to support scatter-gather lists on the memory side, we'll be adding another factor of two more read/write system calls. So the suggestion was one of trying to (probably fruitlessly) trying to stem the expnoential increase in read/write system calls. :-) Cheers, - Ted -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
