On 16.08.19 г. 18:20 ч., Josef Bacik wrote:
> When debugging weird enospc problems it's handy to be able to dump the
> space info when we wake up all tickets, and see what the ticket values
> are. This helped me figure out cases where we were enospc'ing when we
> shouldn't have been.
>
> Signed-off-by: Josef Bacik <josef@xxxxxxxxxxxxxx>
With the suggestion below implemented you can add:
Reviewed-by: Nikolay Borisov <nborisov@xxxxxxxx>
> ---
> fs/btrfs/space-info.c | 32 ++++++++++++++++++++++++--------
> 1 file changed, 24 insertions(+), 8 deletions(-)
>
> diff --git a/fs/btrfs/space-info.c b/fs/btrfs/space-info.c
> index 3d3f301bae26..2819fa91c4f0 100644
> --- a/fs/btrfs/space-info.c
> +++ b/fs/btrfs/space-info.c
> @@ -256,14 +256,9 @@ do { \
> spin_unlock(&__rsv->lock); \
> } while (0)
>
> -void btrfs_dump_space_info(struct btrfs_fs_info *fs_info,
> - struct btrfs_space_info *info, u64 bytes,
> - int dump_block_groups)
> +static void __btrfs_dump_space_info(struct btrfs_fs_info *fs_info,
> + struct btrfs_space_info *info)
> {
> - struct btrfs_block_group_cache *cache;
> - int index = 0;
> -
> - spin_lock(&info->lock);
lockdep_assert_held please
> btrfs_info(fs_info, "space_info %llu has %llu free, is %sfull",
> info->flags,
> info->total_bytes - btrfs_space_info_used(info, true),
> @@ -273,7 +268,6 @@ void btrfs_dump_space_info(struct btrfs_fs_info *fs_info,
> info->total_bytes, info->bytes_used, info->bytes_pinned,
> info->bytes_reserved, info->bytes_may_use,
> info->bytes_readonly);
> - spin_unlock(&info->lock);
>
> DUMP_BLOCK_RSV(fs_info, global_block_rsv);
> DUMP_BLOCK_RSV(fs_info, trans_block_rsv);
> @@ -281,6 +275,19 @@ void btrfs_dump_space_info(struct btrfs_fs_info *fs_info,
> DUMP_BLOCK_RSV(fs_info, delayed_block_rsv);
> DUMP_BLOCK_RSV(fs_info, delayed_refs_rsv);
>
> +}
> +
> +void btrfs_dump_space_info(struct btrfs_fs_info *fs_info,
> + struct btrfs_space_info *info, u64 bytes,
> + int dump_block_groups)
> +{
> + struct btrfs_block_group_cache *cache;
> + int index = 0;
> +
> + spin_lock(&info->lock);
> + __btrfs_dump_space_info(fs_info, info);
> + spin_unlock(&info->lock);
> +
> if (!dump_block_groups)
> return;
>
> @@ -685,6 +692,11 @@ static bool wake_all_tickets(struct btrfs_fs_info *fs_info,
> u64 tickets_id = space_info->tickets_id;
> u64 first_ticket_bytes = 0;
>
> + if (btrfs_test_opt(fs_info, ENOSPC_DEBUG)) {
> + btrfs_info(fs_info, "cannot satisfy tickets, dumping space info");
> + __btrfs_dump_space_info(fs_info, space_info);
> + }
> +
> while (!list_empty(&space_info->tickets) &&
> tickets_id == space_info->tickets_id) {
> ticket = list_first_entry(&space_info->tickets,
> @@ -705,6 +717,10 @@ static bool wake_all_tickets(struct btrfs_fs_info *fs_info,
> else if (first_ticket_bytes > ticket->bytes)
> return true;
>
> + if (btrfs_test_opt(fs_info, ENOSPC_DEBUG))
> + btrfs_info(fs_info, "failing ticket with %llu bytes",
> + ticket->bytes);
> +
> list_del_init(&ticket->list);
> ticket->error = -ENOSPC;
> wake_up(&ticket->wait);
>
