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Btrfs: fix memory leak of block group cache

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While processing delayed refs, we may update block group's statistics
and attach it to cur_trans->dirty_bgs, and later writing dirty block
groups will process the list, which happens during
btrfs_commit_transaction().

For whatever reason, the transaction is aborted and dirty_bgs
is not processed in cleanup_transaction(), we end up with memory leak
of these dirty block group cache.

Since btrfs_start_dirty_block_groups() doesn't make it go to the commit
critical section, this also adds the cleanup work inside it.

Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Liu Bo 2016-07-20 17:44:12 -07:00 committed by David Sterba
parent 08895a8b6b
commit c79a175175
3 changed files with 75 additions and 0 deletions
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71
fs/btrfs/disk-io.c
View File

@ -4475,9 +4475,80 @@ static int btrfs_destroy_pinned_extent(struct btrfs_root *root,
return 0;
}
static void btrfs_cleanup_bg_io(struct btrfs_block_group_cache *cache)
{
struct inode *inode;
inode = cache->io_ctl.inode;
if (inode) {
invalidate_inode_pages2(inode->i_mapping);
BTRFS_I(inode)->generation = 0;
cache->io_ctl.inode = NULL;
iput(inode);
}
btrfs_put_block_group(cache);
}
void btrfs_cleanup_dirty_bgs(struct btrfs_transaction *cur_trans,
struct btrfs_root *root)
{
struct btrfs_block_group_cache *cache;
spin_lock(&cur_trans->dirty_bgs_lock);
while (!list_empty(&cur_trans->dirty_bgs)) {
cache = list_first_entry(&cur_trans->dirty_bgs,
struct btrfs_block_group_cache,
dirty_list);
if (!cache) {
btrfs_err(root->fs_info,
"orphan block group dirty_bgs list");
spin_unlock(&cur_trans->dirty_bgs_lock);
return;
}
if (!list_empty(&cache->io_list)) {
spin_unlock(&cur_trans->dirty_bgs_lock);
list_del_init(&cache->io_list);
btrfs_cleanup_bg_io(cache);
spin_lock(&cur_trans->dirty_bgs_lock);
}
list_del_init(&cache->dirty_list);
spin_lock(&cache->lock);
cache->disk_cache_state = BTRFS_DC_ERROR;
spin_unlock(&cache->lock);
spin_unlock(&cur_trans->dirty_bgs_lock);
btrfs_put_block_group(cache);
spin_lock(&cur_trans->dirty_bgs_lock);
}
spin_unlock(&cur_trans->dirty_bgs_lock);
while (!list_empty(&cur_trans->io_bgs)) {
cache = list_first_entry(&cur_trans->io_bgs,
struct btrfs_block_group_cache,
io_list);
if (!cache) {
btrfs_err(root->fs_info,
"orphan block group on io_bgs list");
return;
}
list_del_init(&cache->io_list);
spin_lock(&cache->lock);
cache->disk_cache_state = BTRFS_DC_ERROR;
spin_unlock(&cache->lock);
btrfs_cleanup_bg_io(cache);
}
}
void btrfs_cleanup_one_transaction(struct btrfs_transaction *cur_trans,
struct btrfs_root *root)
{
btrfs_cleanup_dirty_bgs(cur_trans, root);
ASSERT(list_empty(&cur_trans->dirty_bgs));
ASSERT(list_empty(&cur_trans->io_bgs));
btrfs_destroy_delayed_refs(cur_trans, root);
cur_trans->state = TRANS_STATE_COMMIT_START;

2
fs/btrfs/disk-io.h
View File

@ -136,6 +136,8 @@ int btrfs_init_log_root_tree(struct btrfs_trans_handle *trans,
struct btrfs_fs_info *fs_info);
int btrfs_add_log_tree(struct btrfs_trans_handle *trans,
struct btrfs_root *root);
void btrfs_cleanup_dirty_bgs(struct btrfs_transaction *trans,
struct btrfs_root *root);
void btrfs_cleanup_one_transaction(struct btrfs_transaction *trans,
struct btrfs_root *root);
struct btrfs_root *btrfs_create_tree(struct btrfs_trans_handle *trans,

2
fs/btrfs/extent-tree.c
View File

@ -3694,6 +3694,8 @@ int btrfs_start_dirty_block_groups(struct btrfs_trans_handle *trans,
goto again;
}
spin_unlock(&cur_trans->dirty_bgs_lock);
} else if (ret < 0) {
btrfs_cleanup_dirty_bgs(cur_trans, root);
}
btrfs_free_path(path);