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Subject: Re: [PATCH v4 0/2] NFSD: delay unmount source's export after
 inter-server copy completed.
From:   dai.ngo@oracle.com
To:     olga.kornievskaia@gmail.com
Cc:     trondmy@hammerspace.com, bfields@fieldses.org,
        chuck.lever@oracle.com, linux-nfs@vger.kernel.org
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On 5/3/21 9:37 AM, dai.ngo@oracle.com wrote:

> Hi Olga,
>
> Just a reminder that v4 patch is available for your review.

Ping again in case you did not get the last reminder.

-Dai

>
> Thanks,
>
> -Dai
>
> On 4/23/21 1:59 PM, Dai Ngo wrote:
>> Hi Olga,
>>
>> Currently the source's export is mounted and unmounted on every
>> inter-server copy operation. This causes unnecessary overhead
>> for each copy.
>>
>> This patch series is an enhancement to allow the export to remain
>> mounted for a configurable period (default to 15 minutes). If the
>> export is not being used for the configured time it will be unmounted
>> by a delayed task. If it's used again then its expiration time is
>> extended for another period.
>>
>> Since mount and unmount are no longer done on every copy request,
>> the restriction of copy size (14*rsize), in __nfs4_copy_file_range,
>> is removed.
>>
>> -Dai
>>
>> v2: fix compiler warning of missing prototype.
>> v3: remove the used of semaphore.
>>      eliminated all RPC calls for subsequence mount by allowing
>>         all exports from one server to share one vfsmount.
>>      make inter-server threshold a module configuration parameter.
>> v4: convert nsui_refcnt to use refcount_t.
>>      add note about 20secs wait in nfsd4_interssc_connect.
>>      removed (14*rsize) restriction from __nfs4_copy_file_range.
>>
>>
>>