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btrfs: drop log root for dropped roots

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If we fsync on a subvolume and create a log root for that volume, and
then later delete that subvolume we'll never clean up its log root.  Fix
this by making switch_commit_roots free the log for any dropped roots we
encounter.  The extra churn is because we need a btrfs_trans_handle, not
the btrfs_transaction.

CC: stable@vger.kernel.org # 5.4+
Reviewed-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Josef Bacik 2020-01-17 09:12:45 -05:00 committed by David Sterba
parent 668e48af7a
commit 889bfa3908
1 changed files with 12 additions and 10 deletions
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22
fs/btrfs/transaction.c
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@ -147,13 +147,14 @@ void btrfs_put_transaction(struct btrfs_transaction *transaction)
}
}
static noinline void switch_commit_roots(struct btrfs_transaction *trans)
static noinline void switch_commit_roots(struct btrfs_trans_handle *trans)
{
struct btrfs_transaction *cur_trans = trans->transaction;
struct btrfs_fs_info *fs_info = trans->fs_info;
struct btrfs_root *root, *tmp;
down_write(&fs_info->commit_root_sem);
list_for_each_entry_safe(root, tmp, &trans->switch_commits,
list_for_each_entry_safe(root, tmp, &cur_trans->switch_commits,
dirty_list) {
list_del_init(&root->dirty_list);
free_extent_buffer(root->commit_root);
@ -165,16 +166,17 @@ static noinline void switch_commit_roots(struct btrfs_transaction *trans)
}
/* We can free old roots now. */
spin_lock(&trans->dropped_roots_lock);
while (!list_empty(&trans->dropped_roots)) {
root = list_first_entry(&trans->dropped_roots,
spin_lock(&cur_trans->dropped_roots_lock);
while (!list_empty(&cur_trans->dropped_roots)) {
root = list_first_entry(&cur_trans->dropped_roots,
struct btrfs_root, root_list);
list_del_init(&root->root_list);
spin_unlock(&trans->dropped_roots_lock);
spin_unlock(&cur_trans->dropped_roots_lock);
btrfs_free_log(trans, root);
btrfs_drop_and_free_fs_root(fs_info, root);
spin_lock(&trans->dropped_roots_lock);
spin_lock(&cur_trans->dropped_roots_lock);
}
spin_unlock(&trans->dropped_roots_lock);
spin_unlock(&cur_trans->dropped_roots_lock);
up_write(&fs_info->commit_root_sem);
}
@ -1421,7 +1423,7 @@ static int qgroup_account_snapshot(struct btrfs_trans_handle *trans,
ret = commit_cowonly_roots(trans);
if (ret)
goto out;
switch_commit_roots(trans->transaction);
switch_commit_roots(trans);
ret = btrfs_write_and_wait_transaction(trans);
if (ret)
btrfs_handle_fs_error(fs_info, ret,
@ -2301,7 +2303,7 @@ int btrfs_commit_transaction(struct btrfs_trans_handle *trans)
list_add_tail(&fs_info->chunk_root->dirty_list,
&cur_trans->switch_commits);
switch_commit_roots(cur_trans);
switch_commit_roots(trans);
ASSERT(list_empty(&cur_trans->dirty_bgs));
ASSERT(list_empty(&cur_trans->io_bgs));