io-wq: ensure free/busy list browsing see all items

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We have two lists for workers in io-wq, a busy and a free list. For
certain operations we want to browse all workers, and we currently do
that by browsing the two separate lists. But since these lists are RCU
protected, we can potentially miss workers if they move between the two
lists while we're browsing them.

Add a third list, all_list, that simply holds all workers. A worker is
added to that list when it starts, and removed when it exits. This makes
the worker iteration cleaner, too.

Reported-by: Paul E. McKenney <paulmck@kernel.org>
Reviewed-by: Paul E. McKenney <paulmck@kernel.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

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Jens Axboe 2019-11-13 13:54:49 -07:00

parent 36c2f9223e

commit e61df66c69

1 changed files with 11 additions and 30 deletions

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fs/io-wq.c

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