[Ocfs2-devel] [PATCH] run out of jbd2 credits during discontig group alloc.
Xiaowei
xiaowei.hu at oracle.com
Sun Dec 2 21:23:58 PST 2012
Could someone review this patch please? it's verified one testing box ,
fixed the run out of credits crash.
Thanks,
Xiaowei
On 11/15/2012 09:20 AM, xiaowei.hu at oracle.com wrote:
> From: "Xiaowei.Hu" <xiaowei.hu at oracle.com>
>
> ocfs2_block_group_alloc_discontig doesn't keep credits for chain relink,
> and mean to disable chain relink setting ac->ac_allow_chain_relink = 0,
> but this value will be set to 1 in function ocfs2_claim_suballoc_bits,
> so need to make it's default allow relink, and disable it with one
> switch could be passed in.
>
> Signed-off-by: Xiaowei.Hu <xiaowei.hu at oracle.com>
> ---
> fs/ocfs2/suballoc.c | 7 +++----
> fs/ocfs2/suballoc.h | 2 +-
> 2 files changed, 4 insertions(+), 5 deletions(-)
>
> diff --git a/fs/ocfs2/suballoc.c b/fs/ocfs2/suballoc.c
> index 4b5e568..033bfc6 100644
> --- a/fs/ocfs2/suballoc.c
> +++ b/fs/ocfs2/suballoc.c
> @@ -642,7 +642,7 @@ ocfs2_block_group_alloc_discontig(handle_t *handle,
> * cluster groups will be staying in cache for the duration of
> * this operation.
> */
> - ac->ac_allow_chain_relink = 0;
> + ac->ac_disable_chain_relink = 1;
>
> /* Claim the first region */
> status = ocfs2_block_group_claim_bits(osb, handle, ac, min_bits,
> @@ -1823,7 +1823,7 @@ static int ocfs2_search_chain(struct ocfs2_alloc_context *ac,
> * Do this *after* figuring out how many bits we're taking out
> * of our target group.
> */
> - if (ac->ac_allow_chain_relink &&
> + if (!ac->ac_disable_chain_relink &&
> (prev_group_bh) &&
> (ocfs2_block_group_reasonably_empty(bg, res->sr_bits))) {
> status = ocfs2_relink_block_group(handle, alloc_inode,
> @@ -1928,7 +1928,6 @@ static int ocfs2_claim_suballoc_bits(struct ocfs2_alloc_context *ac,
>
> victim = ocfs2_find_victim_chain(cl);
> ac->ac_chain = victim;
> - ac->ac_allow_chain_relink = 1;
>
> status = ocfs2_search_chain(ac, handle, bits_wanted, min_bits,
> res, &bits_left);
> @@ -1947,7 +1946,7 @@ static int ocfs2_claim_suballoc_bits(struct ocfs2_alloc_context *ac,
> * searching each chain in order. Don't allow chain relinking
> * because we only calculate enough journal credits for one
> * relink per alloc. */
> - ac->ac_allow_chain_relink = 0;
> + ac->ac_disable_chain_relink = 1;
> for (i = 0; i < le16_to_cpu(cl->cl_next_free_rec); i ++) {
> if (i == victim)
> continue;
> diff --git a/fs/ocfs2/suballoc.h b/fs/ocfs2/suballoc.h
> index b8afabf..a36d0aa 100644
> --- a/fs/ocfs2/suballoc.h
> +++ b/fs/ocfs2/suballoc.h
> @@ -49,7 +49,7 @@ struct ocfs2_alloc_context {
>
> /* these are used by the chain search */
> u16 ac_chain;
> - int ac_allow_chain_relink;
> + int ac_disable_chain_relink;
> group_search_t *ac_group_search;
>
> u64 ac_last_group;
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