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SubjectRe: [PATCH v4 1/3] btrfs: add might_sleep() to some places in update_qgroup_limit_item()
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On 2022/11/16 01:17, ChenXiaoSong wrote:
> As the potential sleeping under spin lock is hard to spot, we should add
> might_sleep() to some places.
>
> Signed-off-by: ChenXiaoSong <chenxiaosong2@huawei.com>

Looks good.

We may want to add more in other locations, but this is really a good start.

Reviewed-by: Qu Wenruo <wqu@suse.com>

Thanks,
Qu
> ---
> fs/btrfs/ctree.c | 2 ++
> fs/btrfs/qgroup.c | 2 ++
> 2 files changed, 4 insertions(+)
>
> diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c
> index a9543f01184c..809053e9cfde 100644
> --- a/fs/btrfs/ctree.c
> +++ b/fs/btrfs/ctree.c
> @@ -1934,6 +1934,8 @@ int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root *root,
> int min_write_lock_level;
> int prev_cmp;
>
> + might_sleep();
> +
> lowest_level = p->lowest_level;
> WARN_ON(lowest_level && ins_len > 0);
> WARN_ON(p->nodes[0] != NULL);
> diff --git a/fs/btrfs/qgroup.c b/fs/btrfs/qgroup.c
> index 9334c3157c22..d0480b9c6c86 100644
> --- a/fs/btrfs/qgroup.c
> +++ b/fs/btrfs/qgroup.c
> @@ -779,6 +779,8 @@ static int update_qgroup_limit_item(struct btrfs_trans_handle *trans,
> int ret;
> int slot;
>
> + might_sleep();
> +
> key.objectid = 0;
> key.type = BTRFS_QGROUP_LIMIT_KEY;
> key.offset = qgroup->qgroupid;

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