From: Sudip Mukherjee <sudipm.mukherjee@gmail.com>
To: Jan Kara <jack@suse.cz>
Cc: Jan Kara <jack@suse.com>,
linux-kernel@vger.kernel.org,
Andrew Gabbasov <andrew_gabbasov@mentor.com>
Subject: Re: [PATCH] udf: fix dvd mounting error
Date: Fri, 16 Nov 2018 14:33:14 +0000 [thread overview]
Message-ID: <20181116143314.qn7jmtyz4ad4bax6@debian> (raw)
In-Reply-To: <20181116125633.GG24157@quack2.suse.cz>
On Fri, Nov 16, 2018 at 01:56:33PM +0100, Jan Kara wrote:
> On Thu 15-11-18 12:26:00, Sudip Mukherjee wrote:
> > Some DVDs are failing to mount with the error:
> >
> > [ 632.305370] UDF-fs: warning (device loop0): udf_load_vrs: No anchor found
> > [ 632.305372] UDF-fs: Scanning with blocksize 512 failed
> > [ 632.307837] UDF-fs: warning (device loop0): udf_load_vrs: No anchor found
> > [ 632.307839] UDF-fs: Scanning with blocksize 1024 failed
> > [ 632.309320] UDF-fs: incorrect dstring lengths (32/32)
> > [ 632.309361] UDF-fs: Scanning with blocksize 2048 failed
> > [ 632.309530] UDF-fs: warning (device loop0): udf_load_vrs: No VRS found
> > [ 632.309531] UDF-fs: Scanning with blocksize 4096 failed
> >
> > This particular DVD used to work with v4.4 kernels, and has stopped
> > working after updating the kernel to v4.14. Did a git bisect and that
> > pointed to:
> > c26f6c615788 ("udf: Fix conversion of 'dstring' fields to UTF8")
<snip>
> From e1a7680b960fe25821f2419b4c0b1215f8ab2f9b Mon Sep 17 00:00:00 2001
> From: Jan Kara <jack@suse.cz>
> Date: Fri, 16 Nov 2018 13:43:17 +0100
> Subject: [PATCH] udf: Allow mounting volumes with incorrect identification
> strings
>
> Commit c26f6c615788 ("udf: Fix conversion of 'dstring' fields to UTF8")
> started to be more strict when checking whether converted strings are
> properly formatted. Sudip reports that there are DVDs where the volume
> identification string is actually too long - UDF reports:
>
> [ 632.309320] UDF-fs: incorrect dstring lengths (32/32)
>
> during mount and fails the mount. This is mostly harmless failure as we
> don't need volume identification (and even less volume set
> identification) for anything. So just truncate the volume identification
> string if it is too long and replace it with 'Invalid' if we just cannot
> convert it for other reasons. This keeps slightly incorrect media still
> mountable.
>
> CC: stable@vger.kernel.org
> Fixes: c26f6c615788 ("udf: Fix conversion of 'dstring' fields to UTF8")
> Reported-by: Sudip Mukherjee <sudipm.mukherjee@gmail.com>
> Signed-off-by: Jan Kara <jack@suse.cz>
> ---
It works perfectly. Thanks.
Tested-by: Sudip Mukherjee <sudipm.mukherjee@gmail.com>
> fs/udf/super.c | 16 ++++++++++------
> fs/udf/unicode.c | 14 +++++++++++---
> 2 files changed, 21 insertions(+), 9 deletions(-)
>
<snip>
> - if (ret < 0)
> - goto out_bh;
> -
> - strncpy(UDF_SB(sb)->s_volume_ident, outstr, ret);
> + if (ret < 0) {
> + strcpy(UDF_SB(sb)->s_volume_ident, "Invalid");
Just a suggestion. Even on failed cases, having the volume identification
as "Invalid" might confuse the users. Since you have a maximum limit as 31
maybe something more meaningful like "No Name" ?
--
Regards
Sudip
next prev parent reply other threads:[~2018-11-16 14:33 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-11-15 12:26 [PATCH] udf: fix dvd mounting error Sudip Mukherjee
2018-11-16 12:56 ` Jan Kara
2018-11-16 14:33 ` Sudip Mukherjee [this message]
2018-11-19 9:25 ` Jan Kara
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