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 <sensille@gmx.net>
diff --git a/fs/btrfs/transaction.c b/fs/btrfs/transaction.c
index 21c768c..f1e29fb 100644
--- a/fs/btrfs/transaction.c
+++ b/fs/btrfs/transaction.c
@@ -295,6 +295,7 @@
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 @@
* 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 @@
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 @@
* 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;