btrfs: delayed_ref: Add new function to record reserved space into delayed ref

Add new function btrfs_add_delayed_qgroup_reserve() function to record
how much space is reserved for that extent.

As btrfs only accounts qgroup at run_delayed_refs() time, so newly
allocated extent should keep the reserved space until then.

So add needed function with related members to do it.

Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
Signed-off-by: Chris Mason <clm@fb.com>

diff --git a/fs/btrfs/delayed-ref.c b/fs/btrfs/delayed-ref.c
index ac3e81d..bd9b63b 100644 (file)
--- a/fs/btrfs/delayed-ref.c
+++ b/fs/btrfs/delayed-ref.c
@@ -476,6 +476,8 @@ add_delayed_ref_head(struct btrfs_fs_info *fs_info,
        INIT_LIST_HEAD(&head_ref->ref_list);
        head_ref->processing = 0;
        head_ref->total_ref_mod = count_mod;
+       head_ref->qgroup_reserved = 0;
+       head_ref->qgroup_ref_root = 0;
 
        /* Record qgroup extent info if provided */
        if (qrecord) {
@@ -746,6 +748,33 @@ int btrfs_add_delayed_data_ref(struct btrfs_fs_info *fs_info,
        return 0;
 }
 
+int btrfs_add_delayed_qgroup_reserve(struct btrfs_fs_info *fs_info,
+                                    struct btrfs_trans_handle *trans,
+                                    u64 ref_root, u64 bytenr, u64 num_bytes)
+{
+       struct btrfs_delayed_ref_root *delayed_refs;
+       struct btrfs_delayed_ref_head *ref_head;
+       int ret = 0;
+
+       if (!fs_info->quota_enabled || !is_fstree(ref_root))
+               return 0;
+
+       delayed_refs = &trans->transaction->delayed_refs;
+
+       spin_lock(&delayed_refs->lock);
+       ref_head = find_ref_head(&delayed_refs->href_root, bytenr, 0);
+       if (!ref_head) {
+               ret = -ENOENT;
+               goto out;
+       }
+       WARN_ON(ref_head->qgroup_reserved || ref_head->qgroup_ref_root);
+       ref_head->qgroup_ref_root = ref_root;
+       ref_head->qgroup_reserved = num_bytes;
+out:
+       spin_unlock(&delayed_refs->lock);
+       return ret;
+}
+
 int btrfs_add_delayed_extent_op(struct btrfs_fs_info *fs_info,
                                struct btrfs_trans_handle *trans,
                                u64 bytenr, u64 num_bytes,

diff --git a/fs/btrfs/delayed-ref.h b/fs/btrfs/delayed-ref.h
index 13fb5e6..d4c41e2 100644 (file)
--- a/fs/btrfs/delayed-ref.h
+++ b/fs/btrfs/delayed-ref.h
@@ -112,6 +112,17 @@ struct btrfs_delayed_ref_head {
         */
        int total_ref_mod;
 
+       /*
+        * For qgroup reserved space freeing.
+        *
+        * ref_root and reserved will be recorded after
+        * BTRFS_ADD_DELAYED_EXTENT is called.
+        * And will be used to free reserved qgroup space at
+        * run_delayed_refs() time.
+        */
+       u64 qgroup_ref_root;
+       u64 qgroup_reserved;
+
        /*
         * when a new extent is allocated, it is just reserved in memory
         * The actual extent isn't inserted into the extent allocation tree
@@ -242,6 +253,9 @@ int btrfs_add_delayed_data_ref(struct btrfs_fs_info *fs_info,
                               u64 owner, u64 offset, int action,
                               struct btrfs_delayed_extent_op *extent_op,
                               int no_quota);
+int btrfs_add_delayed_qgroup_reserve(struct btrfs_fs_info *fs_info,
+                                    struct btrfs_trans_handle *trans,
+                                    u64 ref_root, u64 bytenr, u64 num_bytes);
 int btrfs_add_delayed_extent_op(struct btrfs_fs_info *fs_info,
                                struct btrfs_trans_handle *trans,
                                u64 bytenr, u64 num_bytes,