btrfs: qgroup: inherit limit info from srcgroup in creating snapshot.

Currently, when we snapshot a subvol, snapshot will not copy the limits
from srcqgroup.

This patch make the qgroup in snapshot inherit the limit info when create
a snapshot.

Signed-off-by: Dongsheng Yang <yangds.fnst@cn.fujitsu.com>
Signed-off-by: Chris Mason <clm@fb.com>

1 files changed, 8 insertions, 0 deletions

diff --git a/fs/btrfs/qgroup.c b/fs/btrfs/qgroup.c
index 37188c6b408d..34c2753fa4e1 100644
--- a/fs/btrfs/qgroup.c
+++ b/fs/btrfs/qgroup.c
@@ -2302,6 +2302,14 @@ int btrfs_qgroup_inherit(struct btrfs_trans_handle *trans,
                 dstgroup->excl_cmpr = level_size;
                 srcgroup->excl = level_size;
                 srcgroup->excl_cmpr = level_size;
+
+                /* inherit the limit info */
+                dstgroup->lim_flags = srcgroup->lim_flags;
+                dstgroup->max_rfer = srcgroup->max_rfer;
+                dstgroup->max_excl = srcgroup->max_excl;
+                dstgroup->rsv_rfer = srcgroup->rsv_rfer;
+                dstgroup->rsv_excl = srcgroup->rsv_excl;
+
                 qgroup_dirty(fs_info, dstgroup);
                 qgroup_dirty(fs_info, srcgroup);
         }