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Btrfs: fix memory leaks after transaction is aborted 

When a transaction is aborted, or its commit fails before writing the new
superblock and calling btrfs_finish_extent_commit(), we leak reference
counts on the block groups attached to the transaction's delete_bgs list,
because btrfs_finish_extent_commit() is never called for those two cases.
Fix this by dropping their references at btrfs_put_transaction(), which
is called when transactions are aborted (by making the transaction kthread
commit the transaction) or if their commits fail.

Signed-off-by: Filipe Manana <fdmanana@suse.com>
This commit is contained in:
Filipe Manana 2015-11-27 16:12:00 +00:00
parent 50460e3718
commit 7785a663c4
1 changed files with 17 additions and 0 deletions
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17
fs/btrfs/transaction.c
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@ -75,6 +75,23 @@ void btrfs_put_transaction(struct btrfs_transaction *transaction)
list_del_init(&em->list);
free_extent_map(em);
}
/*
* If any block groups are found in ->deleted_bgs then it's
* because the transaction was aborted and a commit did not
* happen (things failed before writing the new superblock
* and calling btrfs_finish_extent_commit()), so we can not
* discard the physical locations of the block groups.
*/
while (!list_empty(&transaction->deleted_bgs)) {
struct btrfs_block_group_cache *cache;
cache = list_first_entry(&transaction->deleted_bgs,
struct btrfs_block_group_cache,
bg_list);
list_del_init(&cache->bg_list);
btrfs_put_block_group_trimming(cache);
btrfs_put_block_group(cache);
}
kmem_cache_free(btrfs_transaction_cachep, transaction);
}
}