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writeback: use RCU to protect bdi_list

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Now that bdi_writeback_all() no longer handles integrity writeback,
it doesn't have to block anymore. This means that we can switch
bdi_list reader side protection to RCU.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
This commit is contained in:
Jens Axboe 2009-09-14 13:12:40 +02:00
parent f11fcae840
commit cfc4ba5365
4 changed files with 63 additions and 28 deletions
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6
fs/fs-writeback.c
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@ -868,16 +868,16 @@ static void bdi_writeback_all(struct writeback_control *wbc)
WARN_ON(wbc->sync_mode == WB_SYNC_ALL);
spin_lock(&bdi_lock);
rcu_read_lock();
list_for_each_entry(bdi, &bdi_list, bdi_list) {
list_for_each_entry_rcu(bdi, &bdi_list, bdi_list) {
if (!bdi_has_dirty_io(bdi))
continue;
bdi_alloc_queue_work(bdi, wbc);
}
spin_unlock(&bdi_lock);
rcu_read_unlock();
}
/*