bcache: add comments for mutex_lock(&b->write_lock)

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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>

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Coly Li 2019-06-28 19:59:56 +08:00 • committed by Jens Axboe

parent e5ec5f4765

commit 41508bb7d4

1 changed files with 10 additions and 0 deletions

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drivers/md/bcache/btree.c

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