fs:aio: Remove TODO comment suggesting hash or array usage in io_cancel()

The comment suggests a hash or array approach to
store the active requests. Currently it iterates
through all the active requests and when found
deletes the requested request, in the linked list.
However io_cancel() isn’t a frequently used operation,
and optimizing it wouldn’t bring a substantial benefit
to real users and the increased complexity of maintaining
a hashtable for this would be significant and will slow
down other operation. Therefore remove this TODO
to avoid people spending time improving this.

Signed-off-by: Mohammed Anees <pvmohammedanees2003@gmail.com>
Link: https://lore.kernel.org/r/20241112113906.15825-1-pvmohammedanees2003@gmail.com


Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Christian Brauner <brauner@kernel.org>