From: Qu Wenruo Date: Tue, 9 Oct 2018 06:36:45 +0000 (+0800) Subject: btrfs: qgroup: Avoid calling qgroup functions if qgroup is not enabled X-Git-Tag: v5.4-rc1~2111^2~38 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=3628b4ca64f24a4ec55055597d0cb1c814729f8b;p=platform%2Fkernel%2Flinux-rpi.git btrfs: qgroup: Avoid calling qgroup functions if qgroup is not enabled Some qgroup trace events like btrfs_qgroup_release_data() and btrfs_qgroup_free_delayed_ref() can still be triggered even if qgroup is not enabled. This is caused by the lack of qgroup status check before calling some qgroup functions. Thankfully the functions can handle quota disabled case well and just do nothing for qgroup disabled case. This patch will do earlier check before triggering related trace events. And for enabled <-> disabled race case: 1) For enabled->disabled case Disable will wipe out all qgroups data including reservation and excl/rfer. Even if we leak some reservation or numbers, it will still be cleared, so nothing will go wrong. 2) For disabled -> enabled case Current btrfs_qgroup_release_data() will use extent_io tree to ensure we won't underflow reservation. And for delayed_ref we use head->qgroup_reserved to record the reserved space, so in that case head->qgroup_reserved should be 0 and we won't underflow. CC: stable@vger.kernel.org # 4.14+ Reported-by: Chris Murphy Link: https://lore.kernel.org/linux-btrfs/CAJCQCtQau7DtuUUeycCkZ36qjbKuxNzsgqJ7+sJ6W0dK_NLE3w@mail.gmail.com/ Signed-off-by: Qu Wenruo Reviewed-by: David Sterba Signed-off-by: David Sterba --- diff --git a/fs/btrfs/qgroup.c b/fs/btrfs/qgroup.c index ac9690f..27f5173 100644 --- a/fs/btrfs/qgroup.c +++ b/fs/btrfs/qgroup.c @@ -3521,6 +3521,10 @@ static int __btrfs_qgroup_release_data(struct inode *inode, int trace_op = QGROUP_RELEASE; int ret; + if (!test_bit(BTRFS_FS_QUOTA_ENABLED, + &BTRFS_I(inode)->root->fs_info->flags)) + return 0; + /* In release case, we shouldn't have @reserved */ WARN_ON(!free && reserved); if (free && reserved) diff --git a/fs/btrfs/qgroup.h b/fs/btrfs/qgroup.h index 80ebeb3..d8f78f5 100644 --- a/fs/btrfs/qgroup.h +++ b/fs/btrfs/qgroup.h @@ -255,6 +255,8 @@ void btrfs_qgroup_free_refroot(struct btrfs_fs_info *fs_info, static inline void btrfs_qgroup_free_delayed_ref(struct btrfs_fs_info *fs_info, u64 ref_root, u64 num_bytes) { + if (!test_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags)) + return; trace_btrfs_qgroup_free_delayed_ref(fs_info, ref_root, num_bytes); btrfs_qgroup_free_refroot(fs_info, ref_root, num_bytes, BTRFS_QGROUP_RSV_DATA);