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Date: Mon, 18 Nov 2019 13:29:21 +0530
From: Ritesh Harjani <riteshh@...ux.ibm.com>
To: Jan Kara <jack@...e.cz>, Ted Tso <tytso@....edu>
Cc: linux-ext4@...r.kernel.org, Eric Biggers <ebiggers@...nel.org>
Subject: Re: [PATCH] jbd2: Make jbd2_handle_buffer_credits() handle reserved
handles
On 11/15/19 3:52 PM, Jan Kara wrote:
> The helper jbd2_handle_buffer_credits() doesn't correctly handle reserved
> handles which can lead to crashes. Fix it getting of journal pointer to
> work for reserved handles as well.
>
> Fixes: a9a8344ee171 ("ext4, jbd2: Provide accessor function for handle credits")
> Reported-by: Eric Biggers <ebiggers@...nel.org>
> Signed-off-by: Jan Kara <jack@...e.cz>
Thanks Jan,
Yes, this also fixes the problem for me with dioread_nolock on ppc64
machine.
You may add -
Tested-by: Ritesh Harjani <riteshh@...ux.ibm.com>
> ---
> include/linux/jbd2.h | 8 ++++++--
> 1 file changed, 6 insertions(+), 2 deletions(-)
>
> diff --git a/include/linux/jbd2.h b/include/linux/jbd2.h
> index 3115eeb44039..a23a3528e07a 100644
> --- a/include/linux/jbd2.h
> +++ b/include/linux/jbd2.h
> @@ -1648,10 +1648,14 @@ static inline tid_t jbd2_get_latest_transaction(journal_t *journal)
> return tid;
> }
>
> -
> static inline int jbd2_handle_buffer_credits(handle_t *handle)
> {
> - journal_t *journal = handle->h_transaction->t_journal;
> + journal_t *journal;
> +
> + if (!handle->h_reserved)
> + journal = handle->h_transaction->t_journal;
> + else
> + journal = handle->h_journal;
>
> return handle->h_total_credits -
> DIV_ROUND_UP(handle->h_revoke_credits_requested,
>
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