From mboxrd@z Thu Jan  1 00:00:00 1970
From: fs.rajat@gmail.com (Rajat Sharma)
Date: Thu, 6 Jan 2011 18:10:35 +0530
Subject: nameidata data structure again
In-Reply-To: <AANLkTi=5J4WXiKzW1hDmFoS4MiFKYTsQUA1g5Cw20hCT@mail.gmail.com>
References: <AANLkTi=YDNHY8zzEoaaKx+cAoJGj0DG3nqm5AKD_ehD5@mail.gmail.com>
	<AANLkTi=5J4WXiKzW1hDmFoS4MiFKYTsQUA1g5Cw20hCT@mail.gmail.com>
Message-ID: <AANLkTimpgcQAFbydUyuS6E+YOUcU42R1j1ToOYfmau7q@mail.gmail.com>
To: kernelnewbies@lists.kernelnewbies.org
List-Id: kernelnewbies.lists.kernelnewbies.org

Hi Mohit,

Please refer to ULK 3rd edition Section 12.5 pathname lookup, it says:

struct qstr      last         Last component of the pathname (used
when the LOOKUP_PARENT flag is set)

so if LOOKUP_PARENT is set, last refers to the last name components,
e.g. in /a/b/c it reference to c while path->dentry->qstr will refer
to b because you intended to lookup parent not the last component.
Note that path is an output parameter while last is input parameter.

Rajat



On Thu, Jan 6, 2011 at 5:18 PM, mohit verma <mohit89mlnc@gmail.com> wrote:
>
>
> ---------- Forwarded message ----------
> From: mohit verma <mohit89mlnc@gmail.com>
> Date: Thu, Jan 6, 2011 at 5:10 PM
> Subject: nameidata data structure again
> To: kernelnewbies <kernelnewbies@nl.linux.org>
>
>
> hi folks,
>
>
> we have qstr data structure part in nameidata structure in name resolution.
> so it may work like this :
>
> ?nameidata->path->dentry->qstr.
>
> it? is the real name component in a? path name for that directory ro file (i
> think so).
>
> so what is? the need of having another qstr like:
>
> namidata->qstr (ie. last)
>
>
> in nameidata structure.
> sorry ,it may seem? foolish to u guys but i ............
>
> thanks in advance.
> --
> ........................
> MOHIT VERMA
>
>
>
> --
> ........................
> MOHIT VERMA
>
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