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(parent: e5ec5f4) | patch
bcache: add comments for mutex_lock(&b->write_lock)
authorColy Li <colyli@suse.de>
Fri, 28 Jun 2019 11:59:56 +0000 (19:59 +0800)
committerJens Axboe <axboe@kernel.dk>
Fri, 28 Jun 2019 13:39:17 +0000 (07:39 -0600)
commit41508bb7d46b74dba631017e5a702a86caf1db8c
tree72a7cc87407d048751e2ab6e676a3969f3b6caa4tree | snapshot
parente5ec5f4765ada9c75fb3eee93a6e72f0e50599d5commit | diff
bcache: add comments for mutex_lock(&b->write_lock)

When accessing or modifying BTREE_NODE_dirty bit, it is not always
necessary to acquire b->write_lock. In bch_btree_cache_free() and
mca_reap() acquiring b->write_lock is necessary, and this patch adds
comments to explain why mutex_lock(&b->write_lock) is necessary for
checking or clearing BTREE_NODE_dirty bit there.

Signed-off-by: Coly Li <colyli@suse.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
drivers/md/bcache/btree.c diff | blob | history
Domain: System / Kernel;