SLES10 ships util-linux-2.12r-35.30 which does not support the -f option
to losetup. To avoid this problem the unused_loop_device() function was
added which attempts to find an unused loop device by checking each
/dev/loop* device with losetup to see if it is configured.
The intent here is to fully remove the previous Solaris thread
implementation so we don't need to simulate both Solaris kernel
and user space thread APIs. The few user space consumers of the
thread API have been updated to use the kthread API. In order
to support this we needed to more fully support the kthread API
and that means not doing crazy things like casting a thread id
to a pointer and using that as was done before. This first
implementation is not effecient but it does provide all the
corrent semantics. If/when performance becomes and issue we
can and should just natively adopt pthreads which is portable.
Let me finish by saying I'm not proud of any of this and I would
love to see it improved. However, this slow implementation does
at least provide all the correct kthread API semantics whereas
the previous method of casting the thread ID to a pointer was
dodgy at best.
gcc-unused and gcc-uninit topic branches at the same time and
then ran 'tg update'. I'll need to keep that sort of thing
in mind when updating multiple topic branches between updates.
within an ASSERT with the ASSERTV macro which will ensure it will
be removed when the ASSERTs are commented out. This makes gcc much
happier, makes the variables usage explicit, and removes the need
for the compiler to detect it is unused and do the right thing.
This is exactly the reason why I want a new topgit command which
takes the base, then incrementally applies all the patches and
compares them againsts what is actually committed. This would
ensure this sort of thing doesn't happen!
code to only use the kthread API regardless of if it is compiled in the
kernel or user space. The kthread API will be layered on top of pthreads
as best as possible in zfs_context, this is non optimal but much clearer.
Brian Behlendorf