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>
(cherry picked from commit 3eeb4d597efc9e068902057f1bd040cffc69e9e6)

diff --git a/fs/btrfs/qgroup.c b/fs/btrfs/qgroup.c
index 37188c6b408ddaee091edbafe7ae85ce94b45463..34c2753fa4e18bddd23ad22379df496cb5ecc462 100644 (file)
--- 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);
        }