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<p style="margin-top:0;margin-bottom:0">Thomas,</p>
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<p style="margin-top:0;margin-bottom:0">Yeah, that's possible, though I don't think people are regularly running in to this. FWIW, I think the intention was to allow extension of layouts component by component. An incomplete layout can have components added
to it.</p>
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<p style="margin-top:0;margin-bottom:0">I can conceive of someone using an incomplete layout to enforce a file size limit, but that's about it.</p>
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<p style="margin-top:0;margin-bottom:0">- Patrick</p>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> LEIBOVICI Thomas <thomas.leibovici@cea.fr><br>
<b>Sent:</b> Friday, February 22, 2019 11:09:03 AM<br>
<b>To:</b> Patrick Farrell; lustre-discuss@lists.lustre.org<br>
<b>Subject:</b> Re: [lustre-discuss] EINVAL error when writing to a PFL file (lustre 2.12.0)</font>
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<div class="x_moz-cite-prefix">Hello Patrick,</div>
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<div class="x_moz-cite-prefix">Thank you for the quick reply.</div>
<div class="x_moz-cite-prefix">No, I have no particular use-case in mind, I'm just playing around with PFL.</div>
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<div class="x_moz-cite-prefix">If this is currently not properly supported, a quick fix could be to prevent the user from creating such incomplete layouts?</div>
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<div class="x_moz-cite-prefix">Regards,</div>
<div class="x_moz-cite-prefix">Thomas<br>
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<div class="x_moz-cite-prefix">On 2/22/19 5:33 PM, Patrick Farrell wrote:<br>
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<p style="margin-top:0; margin-bottom:0">Thomas,</p>
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<p style="margin-top:0; margin-bottom:0">This is expected, but it's also something we'd like to fix - See LU-9341.</p>
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<p style="margin-top:0; margin-bottom:0"><span style="">Basically, append tries to instantiate the layout from 0 to infinity, and it fails because your layout is incomplete (ie doesn't go to infinity).</span><br>
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May I ask why you're creating a file with an incomplete layout? Do you have a use case in mind?</p>
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<p style="margin-top:0; margin-bottom:0">- Patrick</p>
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<div id="x_divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>From:</b> lustre-discuss
<a class="x_moz-txt-link-rfc2396E" href="mailto:lustre-discuss-bounces@lists.lustre.org">
<lustre-discuss-bounces@lists.lustre.org></a> on behalf of LEIBOVICI Thomas <a class="x_moz-txt-link-rfc2396E" href="mailto:thomas.leibovici@cea.fr">
<thomas.leibovici@cea.fr></a><br>
<b>Sent:</b> Friday, February 22, 2019 10:27:48 AM<br>
<b>To:</b> <a class="x_moz-txt-link-abbreviated" href="mailto:lustre-discuss@lists.lustre.org">
lustre-discuss@lists.lustre.org</a><br>
<b>Subject:</b> [lustre-discuss] EINVAL error when writing to a PFL file (lustre 2.12.0)</font>
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<div class="x_PlainText">Hello,<br>
<br>
Is it expected to get an error when appending a PFL file made of 2 <br>
regions [0 - 1M] and [1M to 6M]<br>
even if writing in this range?<br>
<br>
I get an error when appending it, even when writting in the very first <br>
bytes:<br>
<br>
[root@vm0]# lfs setstripe -E 1M -c 1 -E 6M -c 2 /mnt/lustre/m_fou3<br>
<br>
[root@vm0]# lfs getstripe /mnt/lustre/m_fou3<br>
/mnt/lustre/m_fou3<br>
lcm_layout_gen: 2<br>
lcm_mirror_count: 1<br>
lcm_entry_count: 2<br>
lcme_id: 1<br>
lcme_mirror_id: 0<br>
lcme_flags: init<br>
lcme_extent.e_start: 0<br>
lcme_extent.e_end: 1048576<br>
lmm_stripe_count: 1<br>
lmm_stripe_size: 1048576<br>
lmm_pattern: raid0<br>
lmm_layout_gen: 0<br>
lmm_stripe_offset: 3<br>
lmm_objects:<br>
- 0: { l_ost_idx: 3, l_fid: [0x100030000:0x9cf:0x0] }<br>
<br>
lcme_id: 2<br>
lcme_mirror_id: 0<br>
lcme_flags: 0<br>
lcme_extent.e_start: 1048576<br>
lcme_extent.e_end: 6291456<br>
lmm_stripe_count: 2<br>
lmm_stripe_size: 1048576<br>
lmm_pattern: raid0<br>
lmm_layout_gen: 0<br>
lmm_stripe_offset: -1<br>
<br>
[root@vm0]# stat -c %s /mnt/lustre/m_fou3<br>
14<br>
<br>
* append fails:<br>
<br>
[root@vm0]# echo qsdkjqslkdjkj >> /mnt/lustre/m_fou3<br>
bash: echo: write error: Invalid argument<br>
<br>
# strace indicates that write() gets the error:<br>
<br>
write(1, "qsdkjqslkdjkj\n", 14) = -1 EINVAL (Invalid argument)<br>
<br>
* no error in case of an open/truncate:<br>
<br>
[root@vm0]# echo qsdkjqslkdjkj > /mnt/lustre/m_fou3<br>
<br>
OK<br>
<br>
Is it expected or should I open a ticket?<br>
<br>
Thomas<br>
<br>
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