[linux-pm] Freezer: Don't count threads waiting for frozen filesystems.
Miklos Szeredi
miklos at szeredi.hu
Thu Oct 30 10:43:01 PDT 2008
On Thu, 30 Oct 2008, Alan Stern wrote:
> Okay. Don't forget things like ioctl for sockets -- they often involve
> doing I/O directly to the network interface device.
Yeah, ioctls should probably just always be protected (at least
initially), regardless of what type of file they are done on.
> What happens to a task accessing a non-regular file on a fuse
> filesystem? :-)
The same as on any other filesystem, i.e. the fs is only involved as
far as calling init_special_inode(), the rest is taken care of by the
VFS.
Tejun Heo recently posted patches to fuse which enable emulating a
char device from userspace. That is another matter, obviously we'd
want to keep the "allow suspend during I/O" property of fuse in that
case, even though there's a char device involved (but no hardware, at
least not on that level).
Miklos
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