bcache: fix race of writeback thread starting before complete initialization

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[ Upstream commit 07cc6ef8ed ]

The bch_writeback_thread might BUG_ON in read_dirty() if
dc->sb==BDEV_STATE_DIRTY and bch_sectors_dirty_init has not yet completed
its related initialization.  This patch downs the dc->writeback_lock until
after initialization is complete, thus preventing bch_writeback_thread
from proceeding prematurely.

See this thread:
  http://thread.gmane.org/gmane.linux.kernel.bcache.devel/3453

Signed-off-by: Eric Wheeler <bcache@linux.ewheeler.net>
Tested-by: Marc MERLIN <marc@merlins.org>
Cc: <stable@vger.kernel.org>
Signed-off-by: Jens Axboe <axboe@fb.com>
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>

...

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Eric Wheeler 2016-02-26 14:39:06 -08:00 • committed by Sasha Levin

parent e62daff6d2

commit c2f87b5d70

1 changed files with 8 additions and 1 deletions

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drivers/md/bcache/super.c

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