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Date:      Sat, 14 Jan 2017 23:07:44 +0000
From:      bugzilla-noreply@freebsd.org
To:        freebsd-bugs@FreeBSD.org
Subject:   [Bug 216088] Get NFSv4.1 client's failure during recovery keep unrecovered opens
Message-ID:  <bug-216088-8@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D216088

            Bug ID: 216088
           Summary: Get NFSv4.1 client's failure during recovery keep
                    unrecovered opens
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs@FreeBSD.org
          Reporter: rmacklem@FreeBSD.org

Created attachment 178896
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=3D178896&action=
=3Dedit
Don't free unrecovered opens when recovery of them fails

When the NFSv4.1 client is recovering from a server crash/reboot and the
recovery of opens fails, the code in current free's the unrecovered opens.

Byte range locks cannot be kept, since a conflicting lock might have been
acquired by a different client while it is not recovered. The server is
supposed to not allow a recovery when it has previously not been recovered.

However, since all opens for POSIX clients are Share_Deny_None, it seems
safe to attempt to recover them again, in case the server allows this.

This patch changes the client recovery code so that it retains unrecovered
opens, so a subsequent recovery can attempt to recover them.

Normally, this should not happen, but the AmazonEFS server crashes/reboots
frequently, including while recovery is still being done.

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