mirror_zfs/module
Richard Yao 1683e75edc Fix race between getf() and areleasef()
If a vnode is released asynchronously through areleasef(), it is
possible for the user process to reuse the file descriptor before
areleasef is called. When this happens, getf() will return a stale
reference, any operations in the kernel on that file descriptor will
fail (as it is closed) and the operations meant for that fd will
never occur from userspace's perspective.

We correct this by detecting this condition in getf(), doing a putf
on the old file handle, updating the file descriptor and proceeding
as if everything was fine. When the areleasef() is done, it will
harmlessly decrement the reference counter on the Illumos file handle.

Signed-off-by: Richard Yao <ryao@gentoo.org>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #492
2015-12-03 15:44:47 -08:00
..
spl Fix race between getf() and areleasef() 2015-12-03 15:44:47 -08:00
splat Limit maximum object size in kmem tests 2015-11-16 15:02:24 -08:00
.gitignore gitignore: anchor entries at their respective directory 2013-04-02 11:07:52 -07:00
Makefile.in Prevent rm modules.* when make install 2015-12-02 14:38:20 -08:00