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dm thin: reinstate missing mempool_free in cell_release_singleton 

Fix a significant memory leak inadvertently introduced during
simplification of cell_release_singleton() in commit
6f94a4c45a ("dm thin: fix stacked bi_next
usage").

A cell's hlist_del() must be accompanied by a mempool_free().
Use __cell_release() to do this, like before.

Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
This commit is contained in:
Mike Snitzer 2012-05-12 01:43:12 +01:00 committed by Alasdair G Kergon
parent d48b97b403
commit 03aaae7cdc
1 changed files with 6 additions and 3 deletions
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9
drivers/md/dm-thin.c
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@ -279,8 +279,10 @@ static void __cell_release(struct cell *cell, struct bio_list *inmates)
hlist_del(&cell->list);
bio_list_add(inmates, cell->holder);
bio_list_merge(inmates, &cell->bios);
if (inmates) {
bio_list_add(inmates, cell->holder);
bio_list_merge(inmates, &cell->bios);
}
mempool_free(cell, prison->cell_pool);
}
@ -303,9 +305,10 @@ static void cell_release(struct cell *cell, struct bio_list *bios)
*/
static void __cell_release_singleton(struct cell *cell, struct bio *bio)
{
hlist_del(&cell->list);
BUG_ON(cell->holder != bio);
BUG_ON(!bio_list_empty(&cell->bios));
__cell_release(cell, NULL);
}
static void cell_release_singleton(struct cell *cell, struct bio *bio)