aio: kill the misleading rcu read locks in ioctx_add_table() and kill_ioctx()

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ioctx_add_table() is the writer, it does not need rcu_read_lock() to
protect ->ioctx_table. It relies on mm->ioctx_lock and rcu locks just
add the confusion.

And it doesn't need rcu_dereference() by the same reason, it must see
any updates previously done under the same ->ioctx_lock. We could use
rcu_dereference_protected() but the patch uses rcu_dereference_raw(),
the function is simple enough.

The same for kill_ioctx(), although it does not update the pointer.

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Benjamin LaHaise <bcrl@kvack.org>

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Oleg Nesterov 2014-04-30 16:16:36 +02:00 • committed by Benjamin LaHaise

parent 4b70ac5fd9

commit 855ef0dec7

1 changed files with 3 additions and 11 deletions

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fs/aio.c

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