From owner-freebsd-current  Thu Sep  6 22:24:54 2001
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To: "John W. De Boskey" <jwd@FreeBSD.ORG>
Cc: Current List <freebsd-current@FreeBSD.ORG>
Subject: Re: __getcwd & errno 20 (Not a directory) vfs_cache.c 
In-Reply-To: Your message of "Thu, 06 Sep 2001 21:15:32 PDT."
             <20010906211532.A52687@FreeBSD.org> 
Date: Fri, 07 Sep 2001 07:24:17 +0200
Message-ID: <86509.999840257@critter>
From: Poul-Henning Kamp <phk@critter.freebsd.dk>
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You are not supposed to call __getcwd() directly.

Poul-Henning

In message <20010906211532.A52687@FreeBSD.org>, "John W. De Boskey" writes:
>Hi,
>
>   I'm in the middle of trying to debug a java problem
>and have found something I don't quite understand.
>
>   Basically, __getcwd() is returning errno 20, Not
>a directory.  man getcwd doesn't list ENOTDIR so I
>started looking in the sources and found kern/vfs_cache.c:
>
>                if (vp->v_dd->v_id != vp->v_ddid) {
>                        numcwdfail1++;
>                        free(buf, M_TEMP);
>                        return (ENOTDIR);
>                }
>
>
>   Could someone who is more familiar with the vfs
>layers provide some pointers as to what is being
>done here? The code is instrumented, and sysctl
>has the following to say:
>
>% sysctl -a | grep cwd
>vfs.cache.numcwdcalls: 225014
>vfs.cache.numcwdfail1: 845           1 -> ENOTDIR
>vfs.cache.numcwdfail2: 6775          2 -> ENOENT
>vfs.cache.numcwdfail3: 0
>vfs.cache.numcwdfail4: 0
>vfs.cache.numcwdfound: 217394
>
>   The really annoying aspect to this is that it doesn't
>happen everytime, and happens more often when in a nfs
>mounted directory vs. a local directory.
>
>Thanks!
>John
>
>
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-- 
Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk@FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.

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