fs: make close_range() synchronous

__range_close() closes through filp_close() so every file the caller
held the last reference to is punted to task work. That costs one
cmpxchg per file plus a list entry for any later task_work_cancel() to
search under ->pi_lock. close_range(2) exists to close many descriptors
in one go fast. So convert it to the same synchronous treatment as
close(2) and close_files().

Flush and put each file inline while ->file_lock is dropped.
close_range(2) now behaves like close(2).

Link: https://patch.msgid.link/20260910-work-coredump-unlock-self-v4-7-a5c1800dc930@kernel.org
Reviewed-by: NeilBrown <neil@brown.name>
Reviewed-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>

0 files changed, 0 insertions, 0 deletions