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bcache: add code comments in bch_btree_leaf_dirty()

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This patch adds code comments in bch_btree_leaf_dirty() to explain
why w->journal should always reference the eldest journal pin of
all the writing bkeys in the btree node. To make the bcache journal
code to be easier to be understood.

Signed-off-by: Coly Li <colyli@suse.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Coly Li 2019-11-13 16:03:22 +08:00 committed by Jens Axboe
parent 84c529aea1
commit 5dccefd3ea
1 changed files with 5 additions and 0 deletions
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5
drivers/md/bcache/btree.c
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@ -569,6 +569,11 @@ static void bch_btree_leaf_dirty(struct btree *b, atomic_t *journal_ref)
set_btree_node_dirty(b); set_btree_node_dirty(b);
/*
* w->journal is always the oldest journal pin of all bkeys
* in the leaf node, to make sure the oldest jset seq won't
* be increased before this btree node is flushed.
*/
if (journal_ref) { if (journal_ref) {
if (w->journal && if (w->journal &&
journal_pin_cmp(b->c, w->journal, journal_ref)) { journal_pin_cmp(b->c, w->journal, journal_ref)) {