From 03cca8fe300fa35e9be6457d02d75498c88f1d9c Mon Sep 17 00:00:00 2001 From: Boris Burkov Date: Tue, 19 Mar 2024 10:54:22 -0700 Subject: [PATCH] btrfs: qgroup: correctly model root qgroup rsv in convert commit 141fb8cd206ace23c02cd2791c6da52c1d77d42a upstream. We use add_root_meta_rsv and sub_root_meta_rsv to track prealloc and pertrans reservations for subvolumes when quotas are enabled. The convert function does not properly increment pertrans after decrementing prealloc, so the count is not accurate. Note: we check that the fs is not read-only to mirror the logic in qgroup_convert_meta, which checks that before adding to the pertrans rsv. Fixes: 8287475a2055 ("btrfs: qgroup: Use root::qgroup_meta_rsv_* to record qgroup meta reserved space") CC: stable@vger.kernel.org # 6.1+ Reviewed-by: Qu Wenruo Signed-off-by: Boris Burkov Signed-off-by: David Sterba Signed-off-by: Greg Kroah-Hartman --- fs/btrfs/qgroup.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/fs/btrfs/qgroup.c b/fs/btrfs/qgroup.c index 312c7f8853866..99ea2c6d31944 100644 --- a/fs/btrfs/qgroup.c +++ b/fs/btrfs/qgroup.c @@ -4162,6 +4162,8 @@ void btrfs_qgroup_convert_reserved_meta(struct btrfs_root *root, int num_bytes) BTRFS_QGROUP_RSV_META_PREALLOC); trace_qgroup_meta_convert(root, num_bytes); qgroup_convert_meta(fs_info, root->root_key.objectid, num_bytes); + if (!sb_rdonly(fs_info->sb)) + add_root_meta_rsv(root, num_bytes, BTRFS_QGROUP_RSV_META_PERTRANS); } /* -- 2.47.3