On Thu, Apr 04, 2019 at 07:44:48PM +0100, Al Viro wrote: > Huh? sb_writers is taken when we *open* the new file. Then we replace > its ->path.mnt with a clone and transfer the write count from the original > to new one. And close the old file while we are at it. > > >From sb_writers POV mainline has > sb_start_write(new_sb) // in open > sb_start_write(new_sb) // mnt_want_write() on clone > last write to old_sb, then sb_end_write(old_sb) // acct_pin_kill() > sb_end_write(new_sb) // mnt_drop_write(mnt) > and you flip the order of the last two lines. > > Could you explain how exactly does your patch help whatever > problem overlayfs has? Ow... Sorry, -ENOCOFFEE... Let me wake up properly and look at that thing again.
