linux-ext4 - Re: [f2fs-dev] [PATCH v15 6/9] ext4: Log error when lookup of encoded dentry fails

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Message-ID: <8734s24iio.fsf@mailhost.krisman.be>
Date: Wed, 03 Apr 2024 10:39:59 -0400
From: Gabriel Krisman Bertazi <krisman@...e.de>
To: Eric Biggers <ebiggers@...nel.org>
Cc: Eugen Hristev <eugen.hristev@...labora.com>,  tytso@....edu,
  adilger.kernel@...ger.ca,  linux-ext4@...r.kernel.org,
  jaegeuk@...nel.org,  chao@...nel.org,
  linux-f2fs-devel@...ts.sourceforge.net,  linux-fsdevel@...r.kernel.org,
  brauner@...nel.org,  jack@...e.cz,  linux-kernel@...r.kernel.org,
  viro@...iv.linux.org.uk,  kernel@...labora.com,  Gabriel Krisman Bertazi
 <krisman@...labora.com>
Subject: Re: [f2fs-dev] [PATCH v15 6/9] ext4: Log error when lookup of
 encoded dentry fails

Eric Biggers <ebiggers@...nel.org> writes:

> On Tue, Apr 02, 2024 at 06:48:39PM +0300, Eugen Hristev via Linux-f2fs-devel wrote:
>> From: Gabriel Krisman Bertazi <krisman@...labora.com>
>> 

> I'm seeing this error when the volume is *not* in strict mode and a file has a
> name that is not valid UTF-8.  That doesn't seem to be working as
> intended.
>
>     mkfs.ext4 -F -O casefold /dev/vdb
>     mount /dev/vdb /mnt
>     mkdir /mnt/dir
>     chattr +F /mnt/dir
>     touch /mnt/dir/$'\xff'

Yes.  This should work without warnings.  When not in strict mode,
/mnt/dir/$'\xff' is just a valid filename which can only be
looked up with an exact-match name-under-lookup.

The issue is that we must propagate errors from utf8_strncasecmp in
generic_ci_match only if we are in strict mode.  If not on strict mode, we
need to return not-match on error.

-- 
Gabriel Krisman Bertazi