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authorArne Jansen <sensille@gmx.net>2011-09-14 15:44:05 +0200
committerJan Schmidt <list.btrfs@jan-o-sch.net>2012-07-12 10:54:39 +0200
commitc556723794b3487a79de1ecd6354975b1389f5ff (patch)
tree99b363645203df002ab421bbd7be3b56dbd1e6ef /fs/btrfs/transaction.c
parentBtrfs: hooks for qgroup to record delayed refs (diff)
downloadlinux-c556723794b3487a79de1ecd6354975b1389f5ff.tar.xz
linux-c556723794b3487a79de1ecd6354975b1389f5ff.zip
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>
Diffstat (limited to 'fs/btrfs/transaction.c')
-rw-r--r--fs/btrfs/transaction.c16
1 files changed, 16 insertions, 0 deletions
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;