* [lustre-devel] LDLM behaviour question
@ 2021-03-08 14:09 Degremont, Aurelien via lustre-devel
2021-03-12 4:36 ` Alexey Lyashkov via lustre-devel
0 siblings, 1 reply; 2+ messages in thread
From: Degremont, Aurelien via lustre-devel @ 2021-03-08 14:09 UTC (permalink / raw)
To: Lustre Development List
Hi all,
I was not able to find a document giving this level of detail of LDLM behavior.
I have a basic question regarding compatibility between IBITS lock for the same fid.
Is it possible for the same MDT to lock the same FID, with 2 IBITS lock, with different bits? (ie: UPDATE vs LAYOUT)
What's the behavior is not working?
Second question: what happen when you call multiple times mdt_object_lock() for the same fid/same bits on the same MDT?
Thanks
Aurélien
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* Re: [lustre-devel] LDLM behaviour question
2021-03-08 14:09 [lustre-devel] LDLM behaviour question Degremont, Aurelien via lustre-devel
@ 2021-03-12 4:36 ` Alexey Lyashkov via lustre-devel
0 siblings, 0 replies; 2+ messages in thread
From: Alexey Lyashkov via lustre-devel @ 2021-03-12 4:36 UTC (permalink / raw)
To: Degremont, Aurelien; +Cc: Lustre Development List
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Aurélien,
> 8 марта 2021 г., в 17:09, Degremont, Aurelien via lustre-devel <lustre-devel@lists.lustre.org> написал(а):
>
> Hi all,
>
> I was not able to find a document giving this level of detail of LDLM behavior.
I think this aged book will good start. https://wiki.lustre.org/images/d/da/Understanding_Lustre_Filesystem_Internals.pdf <https://wiki.lustre.org/images/d/da/Understanding_Lustre_Filesystem_Internals.pdf>
> I have a basic question regarding compatibility between IBITS lock for the same fid.
>
> Is it possible for the same MDT to lock the same FID, with 2 IBITS lock, with different bits? (ie: UPDATE vs LAYOUT)
> What's the behavior is not working?
>
Yes, this is possible. Same story as LOOKUP, OPEN, DOM …
> Second question: what happen when you call multiple times mdt_object_lock() for the same fid/same bits on the same MDT?
>
> Thanks
>
> Aurélien
>
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> lustre-devel mailing list
> lustre-devel@lists.lustre.org
> http://lists.lustre.org/listinfo.cgi/lustre-devel-lustre.org
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