Date: Wed, 14 Dec 2016 13:09:02 +0000 From: Rick Macklem <rmacklem@uoguelph.ca> To: Colin Percival <cperciva@tarsnap.com>, Benjamin Kaduk <kaduk@mit.edu> Cc: "freebsd-fs@freebsd.org" <freebsd-fs@freebsd.org> Subject: Re: ESTALE after cwd deleted by same NFS client Message-ID: <YTXPR01MB0189ACD940B7D399A6855CB8DD9A0@YTXPR01MB0189.CANPRD01.PROD.OUTLOOK.COM> In-Reply-To: <01000158fc3da2c5-c13da088-e7b9-4ac0-ac01-ec49a275dd24-000000@email.amazonses.com> References: <01000158f023675b-41b35a73-4428-4937-853b-62db4fb9b984-000000@email.amazonses.com> <20161212054233.GU8460@kduck.kaduk.org> <01000158f1abc081-d4eddc58-3b4b-41dd-aa1e-0157d2fad812-000000@email.amazonses.com> <20161212163603.GV8460@kduck.kaduk.org> <YQBPR01MB018054EE62DEFDC73784AD9BDD9B0@YQBPR01MB0180.CANPRD01.PROD.OUTLOOK.COM>, <01000158fc3da2c5-c13da088-e7b9-4ac0-ac01-ec49a275dd24-000000@email.amazonses.com>
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Colin Percival wrote:
>On 12/13/16 05:04, Rick Macklem wrote:
>>>>> On Sun, Dec 11, 2016 at 11:06:42PM +0000, Colin Percival wrote:
>>>>>> If I run the following with /nfs/ being an NFS mount:
>>>>>> # mkdir /nfs/foo
>>>>>> # touch /nfs/foo/bar
>>>>>> # cd /nfs/foo
>>>>>> # rm -r /nfs/foo
>>>>>> # rm bar
>> If this is happening on a single client
>
>Yes. At the time I ran this, there was only one client.
>
>> something is broken.
>> - For this step, the name cache should have a miss and the Lookup should fail with
>> ENOENT. I think the most likely failures are...
>> --> Either the name cache in the client is broken and has a hit
>> OR
>> --> The server replies NFS_OK for the lookup, even though it should have been >removed.
>
>The server replied ESTALE for the 'rm bar'. Is that the lookup you mean? I
>don't think a lookup happened for /nfs/foo after the 'rm -r' completed, since
>it was already the current directory (despite no longer existing).
If there was no Lookup between "rm -r /nfs/foo" and "rm bar" then that is the
problem. The NFS client remove makes a cache call (can't remember the exact
function name without looking at the code) which should invalidate the mapping
of the name ("bar" in this case). Then, a Lookup of "bar" should occur.
--> I'll try and reproduce this when I get home on the weekend.
rick
[stuff snipped]
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