From c556723794b3487a79de1ecd6354975b1389f5ff Mon Sep 17 00:00:00 2001 From: Arne Jansen Date: Wed, 14 Sep 2011 15:44:05 +0200 Subject: Btrfs: hooks to reserve qgroup space Like block reserves, reserve a small piece of space on each transaction start and for delalloc. These are the hooks that can actually return EDQUOT to the user. The amount of space reserved is tracked in the transaction handle. Signed-off-by: Arne Jansen --- fs/btrfs/transaction.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) (limited to 'fs/btrfs/transaction.c') diff --git a/fs/btrfs/transaction.c b/fs/btrfs/transaction.c index 21c768cb443f..f1e29fbd5317 100644 --- a/fs/btrfs/transaction.c +++ b/fs/btrfs/transaction.c @@ -295,6 +295,7 @@ static struct btrfs_trans_handle *start_transaction(struct btrfs_root *root, struct btrfs_transaction *cur_trans; u64 num_bytes = 0; int ret; + u64 qgroup_reserved = 0; if (root->fs_info->fs_state & BTRFS_SUPER_FLAG_ERROR) return ERR_PTR(-EROFS); @@ -313,6 +314,14 @@ static struct btrfs_trans_handle *start_transaction(struct btrfs_root *root, * the appropriate flushing if need be. */ if (num_items > 0 && root != root->fs_info->chunk_root) { + if (root->fs_info->quota_enabled && + is_fstree(root->root_key.objectid)) { + qgroup_reserved = num_items * root->leafsize; + ret = btrfs_qgroup_reserve(root, qgroup_reserved); + if (ret) + return ERR_PTR(ret); + } + num_bytes = btrfs_calc_trans_metadata_size(root, num_items); ret = btrfs_block_rsv_add(root, &root->fs_info->trans_block_rsv, @@ -351,6 +360,7 @@ again: h->block_rsv = NULL; h->orig_rsv = NULL; h->aborted = 0; + h->qgroup_reserved = qgroup_reserved; h->delayed_ref_elem.seq = 0; INIT_LIST_HEAD(&h->qgroup_ref_list); @@ -524,6 +534,12 @@ static int __btrfs_end_transaction(struct btrfs_trans_handle *trans, * end_transaction. Subvolume quota depends on this. */ WARN_ON(trans->root != root); + + if (trans->qgroup_reserved) { + btrfs_qgroup_free(root, trans->qgroup_reserved); + trans->qgroup_reserved = 0; + } + while (count < 2) { unsigned long cur = trans->delayed_ref_updates; trans->delayed_ref_updates = 0; -- cgit v1.2.3