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Btrfs: hooks to reserve qgroup space

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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>
This commit is contained in:
Arne Jansen
2011-09-14 15:44:05 +02:00
committed by Jan Schmidt
parent 546adb0d81
commit c556723794
3 changed files with 29 additions and 0 deletions
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16
fs/btrfs/transaction.c
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@@ -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;