Ping..
On Thu, 23 Oct 2014 16:44:54 +0800, Miao Xie wrote:
> On Thu, 18 Sep 2014 11:27:17 -0400, Josef Bacik wrote:
>> Trying to reproduce a log enospc bug I hit a panic in the async reclaim code
>> during log replay. This is because we use fs_info->fs_root as our root for
>> shrinking and such. Technically we can use whatever root we want, but let's
>> just not allow async reclaim while we're doing log replay. Thanks,
>
> Why not move the code of fs_root initialization to the front of log replay?
> I think it is better than the fix way in this patch because the async reclaimer
> can help us do some work.
>
> Thanks
> Miao
>
>>
>> Signed-off-by: Josef Bacik <jbacik@xxxxxx>
>> ---
>> V1->V2: use fs_info->log_root_recovering instead, didn't notice this existed
>> before.
>>
>> fs/btrfs/extent-tree.c | 8 +++++++-
>> 1 file changed, 7 insertions(+), 1 deletion(-)
>>
>> diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
>> index 28a27d5..44d0497 100644
>> --- a/fs/btrfs/extent-tree.c
>> +++ b/fs/btrfs/extent-tree.c
>> @@ -4513,7 +4513,13 @@ again:
>> space_info->flush = 1;
>> } else if (!ret && space_info->flags & BTRFS_BLOCK_GROUP_METADATA) {
>> used += orig_bytes;
>> - if (need_do_async_reclaim(space_info, root->fs_info, used) &&
>> + /*
>> + * We will do the space reservation dance during log replay,
>> + * which means we won't have fs_info->fs_root set, so don't do
>> + * the async reclaim as we will panic.
>> + */
>> + if (!root->fs_info->log_root_recovering &&
>> + need_do_async_reclaim(space_info, root->fs_info, used) &&
>> !work_busy(&root->fs_info->async_reclaim_work))
>> queue_work(system_unbound_wq,
>> &root->fs_info->async_reclaim_work);
>>
>
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