tree 906d45a09a122d9887c5ca0115303297deb07701
parent 31ae962c3e3cec3215ed86d3a2f6b974a16e69be
author Al Viro <viro@zeniv.linux.org.uk> 1771998806 -0500
committer Al Viro <viro@zeniv.linux.org.uk> 1772070506 -0500

simplify unshare_fs()

Return the resulting fs_struct pointer directly; use ERR_PTR() for
alloc_fs_struct() failure and NULL for "no new fs_struct needed";
both unshare_fs() and its caller are happier that way.

While we are at it, remove the pointless check for NULL current->fs -
it can happen only late in do_exit() and at that point we are *not*
going to call unshare(2) or any other syscalls.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>