Re: GSoC-2016

To: HRISHIKESH GOYAL <hrishi.goyal%gmail.com@localhost>, tech-kern%netbsd.org@localhost
Subject: Re: GSoC-2016
From: christos%zoulas.com@localhost (Christos Zoulas)
Date: Fri, 10 Jun 2016 17:23:18 -0400
On Jun 10, 11:44pm, hrishi.goyal%gmail.com@localhost (HRISHIKESH GOYAL) wrote:
-- Subject: Re: GSoC-2016

| Hello sir,
| 
| I am working on Htree directory index  traversing in lookup() operation. I
| am facing difficulty in testing of  Htree index code. I see the control
| never goes to Htree index traversal code because the value
| (i_flag&EXT4_INDEX) is false in the Ext4 disk image created by Htree
| indexing for directory enabled Linux's Ext4fs driver.
| Since index follows the link list indexing within a block I created 800
| files to make sure that it gets overflow the 4 kb block and Htree gets
| created. I m not able to figure out why directory index is still link list
| type. Or if it is not then why (i_flag&EXT4_INDEX) value is false.
| Regards
| Hrishikesh

The code that determines if the directory needs indexing is:
http://lxr.free-electrons.com/source/fs/ext4/dir.c?v=4.1#L39

It would be useful to run a linux kernel on another VM and put printfs
in the ext code to see when that function returns true...

Or you can keep creating more files :-) Eventually it will probably
decide to index if the other conditionals are true.

christos

| 
| On Sun, Jun 5, 2016 at 8:09 PM, Christos Zoulas <christos%zoulas.com@localhost> wrote:
| 
| > On Jun 5,  7:44am, hrishi.goyal%gmail.com@localhost (HRISHIKESH GOYAL) wrote:
| > -- Subject: Re: GSoC-2016
| >
| > | Hello sir,
| > | I started doing Htree directory index, albeit some improvements in
| > | 'extents' are yet to be done. But those can be handled afterwards as I
| > have
| > | clear understanding of where and what is to be added/fixed. If you have
| > | some other plan for me then please let me know. I will do the job
| > | accordingly.
| > | Regards
| > | Hrishikesh
| >
| > No, I don't have any other plan. As you've seen I've committed the extents
| > changes (please take a look on my minor changes). Also we already got one
| > happy user who said in the mailing lists he was happy you implemented them.
| > As always please let me know if you need anything.
| >
| 
| Yes I have looked at the minor changes you made. I will follow NetBSD
| standard from now onwards.
| 
| 
| 
| >
| 
| Good luck,
| >
| > christos
| >
| 
| --001a113d65ca33c3610534f083ff
| Content-Type: text/html; charset=UTF-8
| Content-Transfer-Encoding: quoted-printable
| 
| <p dir=3D"ltr">Hello sir,</p>
| <p dir=3D"ltr">I am working on Htree directory index=C2=A0 traversing in lo=
| okup() operation. I am facing difficulty in testing of=C2=A0 Htree index co=
| de. I see the control never goes to Htree index traversal code because the =
| value (i_flag&amp;EXT4_INDEX) is false in the Ext4 disk image created by Ht=
| ree indexing for directory enabled Linux&#39;s Ext4fs driver.<br>
| Since index follows the link list indexing within a block I created 800 fil=
| es to make sure that it gets overflow the 4 kb block and Htree gets created=
| . I m not able to figure out why directory index is still link list type. O=
| r if it is not then why (i_flag&amp;EXT4_INDEX) value is false.<br>
| Regards<br>
| Hrishikesh</p>
| <p><DEFANGED_div class=3D"gmail_quot&lt;blockquote class=3D" style=3D"margi=
| n:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><p><DEFANGED_div =
| dir=3D"ltr"><p><DEFANGED_div class=3D"gmail_extra"><br><p><DEFANGED_div cla=
| ss=3D"gmail_quote">On Sun, Jun 5, 2016 at 8:09 PM, Christos Zoulas <DEFANGE=
| D_span dir=3D"ltr">&lt;<a href=3D"mailto:christos%zoulas.com@localhost"; target=3D"_bl=
| ank">christos%zoulas.com@localhost</a>&gt;</DEFANGED_span> wrote:<br><blockquote clas=
| s=3D"gmail_quote" DEFANGED_style=3D"margin:0px 0px 0px 0.8ex;border-left:1p=
| x solid rgb(204,204,204);padding-left:1ex"><DEFANGED_span>On Jun 5,=C2=A0 7=
| :44am, <a href=3D"mailto:hrishi.goyal%gmail.com@localhost"; target=3D"_blank">hrishi.g=
| oyal%gmail.com@localhost</a> (HRISHIKESH GOYAL) wrote:<br>
| -- Subject: Re: GSoC-2016<br>
| <br>
| | Hello sir,<br>
| </DEFANGED_span><DEFANGED_span>| I started doing Htree directory index, alb=
| eit some improvements in<br>
| | &#39;extents&#39; are yet to be done. But those can be handled afterwards=
|  as I have<br>
| | clear understanding of where and what is to be added/fixed. If you have<b=
| r>
| | some other plan for me then please let me know. I will do the job<br>
| | accordingly.<br>
| | Regards<br>
| | Hrishikesh<br>
| <br>
| </DEFANGED_span>No, I don&#39;t have any other plan. As you&#39;ve seen I&#=
| 39;ve committed the extents<br>
| changes (please take a look on my minor changes). Also we already got one<b=
| r>
| happy user who said in the mailing lists he was happy you implemented them.=
| <br>
| As always please let me know if you need anything.<br></blockquote><p><DEFA=
| NGED_div><br>Yes I have looked at the minor changes you made. I will follow=
|  NetBSD standard from now onwards.<br><br>=C2=A0</p><DEFANGED_div><blockquo=
| te class=3D"gmail_quote" DEFANGED_style=3D"margin:0px 0px 0px 0.8ex;border-=
| left:1px solid rgb(204,204,204);padding-left:1ex">
| =C2=A0</blockquote><blockquote class=3D"gmail_quote" DEFANGED_style=3D"marg=
| in:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1e=
| x">
| Good luck,<br>
| <br>
| christos<br>
| </blockquote></p><DEFANGED_div><br></p><DEFANGED_div></p><DEFANGED_div>
| </p><DEFANGED_div>
| 
| --001a113d65ca33c3610534f083ff--
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|         Rewrote HTML tag: >>_/span_<<
|                       as: >>_/DEFANGED_span_<<
|         Rewrote HTML tag: >>_span_<<
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|         Rewrote HTML tag: >>_/span_<<
|                       as: >>_/DEFANGED_span_<<
|         Rewrote HTML tag: >>_div_<<
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|         Rewrote HTML tag: >>_blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"_<<
|                       as: >>_blockquote class="gmail_quote" DEFANGED_style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"_<<
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|                       as: >>_blockquote class="gmail_quote" DEFANGED_style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"_<<
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|         Rewrote HTML tag: >>_/div_<<
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| 
|     Total modifications so far: 19
| 
| 
| Anomy 0.0.0 : Sanitizer.pm
| $Id: Sanitizer.pm,v 1.94 2006/01/02 16:43:10 bre Exp $
| 
| --MIMEStream=_0+101145_9380720988921_49487885396--
-- End of excerpt from HRISHIKESH GOYAL
References:
- Re: GSoC-2016
  - From: HRISHIKESH GOYAL
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