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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
References: <20210423205946.24407-1-dai.ngo@oracle.com>
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Hi Olga,

Just a reminder that v4 patch is available for your review.

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.
>
>
>