Linus Torvalds writes: (Summary) wrote:
around while a pty is open.
We always used to do that, but we did it differently - we would keep the 's_active' count elevated so that the superblock never went away, even after it was unmounted.
even after it was unmounted.
Now it does an actual mntget(), and that makes umount _notice_ that the filesystem is still busy.
the filesystem is still busy.
How annoying.
How annoying.
Because in a very real sehse the filesystem really is busy, but we used to hide it (perhaps on purpose - it's possible that people hit this problem before).
this problem before).
Let me try to think about alteratives.
[...]
W: Could not unmount dev/ptmx: umount: /var/cache/pbuilder/build/1340/dev/ptmx: target is busy Yes, that patch definitely keeps a reference to the pts filesystem around while a pty is open.around while a pty is open.
We always used to do that, but we did it differently - we would keep the 's_active' count elevated so that the superblock never went away, even after it was unmounted.
even after it was unmounted.
Now it does an actual mntget(), and that makes umount _notice_ that the filesystem is still busy.
the filesystem is still busy.
How annoying.
How annoying.
Because in a very real sehse the filesystem really is busy, but we used to hide it (perhaps on purpose - it's possible that people hit this problem before).
this problem before).
Let me try to think about alteratives.
