Date: Sat, 3 Nov 2012 21:38:49 +1100 From: Peter Jeremy <peter@rulingia.com> To: Garrett Cooper <yanegomi@gmail.com> Cc: FreeBSD FS <freebsd-fs@freebsd.org> Subject: Re: Inconsistent/potentially incorrect behavior with relative lookups via chdir(2) on UFS/ZFS Message-ID: <20121103103849.GD12996@server.rulingia.com> In-Reply-To: <CAGH67wSa7y-Nz=Pm%2BpxL3TRyKvBdDq2s3paSCu3LB-AFwmO_2g@mail.gmail.com> References: <CAGH67wSa7y-Nz=Pm%2BpxL3TRyKvBdDq2s3paSCu3LB-AFwmO_2g@mail.gmail.com>
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On 2012-Nov-01 15:25:05 -0700, Garrett Cooper <yanegomi@gmail.com> wrote:
> Just doing some interop testing on UFS/ZFS to develop a baseline for
>filesystem behavior, and I noticed some inconsistencies with the ENOENT
>requirement in chdir(2) when dealing with relative ".." paths (dot-dot
>lookups). In particular...
> 1. I would have expected chdir('.') to have failed in UFS/ZFS with
>ENOENT if '.' wasn't present, but it didn't.
> 2. I would have expected chdir('..') to have failed in ZFS with ENOENT
>if '..' wasn't present, but it didn't.
> Sidenote: python doesn't do any special handling with os.chdir, per
>Modules/posixmodule.c (I checked).
> The full test I ran is included below.
Whilst playing with the above, I've found some wierd timing issues
with UFS+SU:
$ mkdir -p ~/p/q/r;sync
$ cd p/q/r
$ rm -r ~/p; while date; do sleep 3 ; ls -al;done
Sat 3 Nov 2012 21:29:19 EST
total 2
drwxr-xr-x 0 peter jeremy 512 3 Nov 21:28 .
drwxr-xr-x 0 peter jeremy 0 3 Nov 21:29 ..
Sat 3 Nov 2012 21:29:22 EST
total 2
drwxr-xr-x 0 peter jeremy 512 3 Nov 21:28 .
drwxr-xr-x 0 peter jeremy 0 3 Nov 21:29 ..
Sat 3 Nov 2012 21:29:25 EST
total 2
drwxr-xr-x 0 peter jeremy 512 3 Nov 21:28 .
drwxr-xr-x 0 peter jeremy 0 3 Nov 21:29 ..
Sat 3 Nov 2012 21:29:28 EST
total 2
drwxr-xr-x 0 peter jeremy 512 3 Nov 21:28 .
drwxr-xr-x 0 peter jeremy 0 3 Nov 21:29 ..
Sat 3 Nov 2012 21:29:31 EST
total 2
drwxr-xr-x 0 peter jeremy 512 3 Nov 21:28 .
drwxr-xr-x 0 peter jeremy 0 3 Nov 21:29 ..
Sat 3 Nov 2012 21:29:34 EST
total 2
drwxr-xr-x 0 peter jeremy 512 3 Nov 21:28 .
drwxr-xr-x 0 peter jeremy 0 3 Nov 21:29 ..
Sat 3 Nov 2012 21:29:37 EST
total 2
drwxr-xr-x 0 peter jeremy 512 3 Nov 21:28 .
drwxr-xr-x 0 peter jeremy 0 3 Nov 21:29 ..
Sat 3 Nov 2012 21:29:40 EST
total 2
drwxr-xr-x 0 peter jeremy 512 3 Nov 21:28 .
drwxr-xr-x 0 peter jeremy 0 3 Nov 21:29 ..
Sat 3 Nov 2012 21:29:43 EST
total 2
drwxr-xr-x 0 peter jeremy 512 3 Nov 21:28 .
drwxr-xr-x 0 peter jeremy 0 3 Nov 21:29 ..
Sat 3 Nov 2012 21:29:46 EST
total 0
Sat 3 Nov 2012 21:29:49 EST
--=20
Peter Jeremy
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