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From: Greg KH <gregkh@linuxfoundation.org>
To: Jaegeuk Kim <jaegeuk@kernel.org>
Cc: Daniel Rosenberg <drosen@google.com>, Chao Yu <chao@kernel.org>,
	linux-f2fs-devel@lists.sourceforge.net,
	linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org,
	Gabriel Krisman Bertazi <krisman@collabora.com>,
	kernel-team@android.com, stable@vger.kernel.org
Subject: Re: [PATCH v2 2/2] f2fs: Advertise encrypted casefolding in sysfs
Date: Thu, 3 Jun 2021 19:26:12 +0200	[thread overview]
Message-ID: <YLkQtDZFG1xKoqE5@kroah.com> (raw)
In-Reply-To: <YLj36Fmz3dSHmkSG@google.com>

On Thu, Jun 03, 2021 at 08:40:24AM -0700, Jaegeuk Kim wrote:
> On 06/03, Greg KH wrote:
> > On Thu, Jun 03, 2021 at 09:50:38AM +0000, Daniel Rosenberg wrote:
> > > Older kernels don't support encryption with casefolding. This adds
> > > the sysfs entry encrypted_casefold to show support for those combined
> > > features. Support for this feature was originally added by
> > > commit 7ad08a58bf67 ("f2fs: Handle casefolding with Encryption")
> > > 
> > > Fixes: 7ad08a58bf67 ("f2fs: Handle casefolding with Encryption")
> > > Cc: stable@vger.kernel.org # v5.11+
> > > Signed-off-by: Daniel Rosenberg <drosen@google.com>
> > > ---
> > >  fs/f2fs/sysfs.c | 15 +++++++++++++--
> > >  1 file changed, 13 insertions(+), 2 deletions(-)
> > > 
> > > diff --git a/fs/f2fs/sysfs.c b/fs/f2fs/sysfs.c
> > > index 09e3f258eb52..6604291a3cdf 100644
> > > --- a/fs/f2fs/sysfs.c
> > > +++ b/fs/f2fs/sysfs.c
> > > @@ -161,6 +161,9 @@ static ssize_t features_show(struct f2fs_attr *a,
> > >  	if (f2fs_sb_has_compression(sbi))
> > >  		len += scnprintf(buf + len, PAGE_SIZE - len, "%s%s",
> > >  				len ? ", " : "", "compression");
> > > +	if (f2fs_sb_has_casefold(sbi) && f2fs_sb_has_encrypt(sbi))
> > > +		len += scnprintf(buf + len, PAGE_SIZE - len, "%s%s",
> > > +				len ? ", " : "", "encrypted_casefold");
> > >  	len += scnprintf(buf + len, PAGE_SIZE - len, "%s%s",
> > >  				len ? ", " : "", "pin_file");
> > >  	len += scnprintf(buf + len, PAGE_SIZE - len, "\n");
> > 
> > This is a HUGE abuse of sysfs and should not be encouraged and added to.
> 
> This feature entry was originally added in 2017. Let me try to clean this up
> after merging this.

Thank you.

> > Please make these "one value per file" and do not keep growing a single
> > file that has to be parsed otherwise you will break userspace tools.
> > 
> > And I don't see a Documentation/ABI/ entry for this either :(
> 
> There is in Documentation/ABI/testing/sysfs-fs-f2fs.

So this new item was documented in the file before the kernel change was
made?

greg k-h

WARNING: multiple messages have this Message-ID
From: Greg KH <gregkh@linuxfoundation.org>
To: Jaegeuk Kim <jaegeuk@kernel.org>
Cc: Daniel Rosenberg <drosen@google.com>,
	kernel-team@android.com, linux-kernel@vger.kernel.org,
	stable@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net,
	linux-fsdevel@vger.kernel.org,
	Gabriel Krisman Bertazi <krisman@collabora.com>
Subject: Re: [f2fs-dev] [PATCH v2 2/2] f2fs: Advertise encrypted casefolding in sysfs
Date: Thu, 3 Jun 2021 19:26:12 +0200	[thread overview]
Message-ID: <YLkQtDZFG1xKoqE5@kroah.com> (raw)
In-Reply-To: <YLj36Fmz3dSHmkSG@google.com>

On Thu, Jun 03, 2021 at 08:40:24AM -0700, Jaegeuk Kim wrote:
> On 06/03, Greg KH wrote:
> > On Thu, Jun 03, 2021 at 09:50:38AM +0000, Daniel Rosenberg wrote:
> > > Older kernels don't support encryption with casefolding. This adds
> > > the sysfs entry encrypted_casefold to show support for those combined
> > > features. Support for this feature was originally added by
> > > commit 7ad08a58bf67 ("f2fs: Handle casefolding with Encryption")
> > > 
> > > Fixes: 7ad08a58bf67 ("f2fs: Handle casefolding with Encryption")
> > > Cc: stable@vger.kernel.org # v5.11+
> > > Signed-off-by: Daniel Rosenberg <drosen@google.com>
> > > ---
> > >  fs/f2fs/sysfs.c | 15 +++++++++++++--
> > >  1 file changed, 13 insertions(+), 2 deletions(-)
> > > 
> > > diff --git a/fs/f2fs/sysfs.c b/fs/f2fs/sysfs.c
> > > index 09e3f258eb52..6604291a3cdf 100644
> > > --- a/fs/f2fs/sysfs.c
> > > +++ b/fs/f2fs/sysfs.c
> > > @@ -161,6 +161,9 @@ static ssize_t features_show(struct f2fs_attr *a,
> > >  	if (f2fs_sb_has_compression(sbi))
> > >  		len += scnprintf(buf + len, PAGE_SIZE - len, "%s%s",
> > >  				len ? ", " : "", "compression");
> > > +	if (f2fs_sb_has_casefold(sbi) && f2fs_sb_has_encrypt(sbi))
> > > +		len += scnprintf(buf + len, PAGE_SIZE - len, "%s%s",
> > > +				len ? ", " : "", "encrypted_casefold");
> > >  	len += scnprintf(buf + len, PAGE_SIZE - len, "%s%s",
> > >  				len ? ", " : "", "pin_file");
> > >  	len += scnprintf(buf + len, PAGE_SIZE - len, "\n");
> > 
> > This is a HUGE abuse of sysfs and should not be encouraged and added to.
> 
> This feature entry was originally added in 2017. Let me try to clean this up
> after merging this.

Thank you.

> > Please make these "one value per file" and do not keep growing a single
> > file that has to be parsed otherwise you will break userspace tools.
> > 
> > And I don't see a Documentation/ABI/ entry for this either :(
> 
> There is in Documentation/ABI/testing/sysfs-fs-f2fs.

So this new item was documented in the file before the kernel change was
made?

greg k-h


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  reply	other threads:[~2021-06-03 17:26 UTC|newest]

Thread overview: 48+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-03  9:50 [PATCH v2 0/2] Fix up casefolding sysfs entries for F2FS Daniel Rosenberg
2021-06-03  9:50 ` [f2fs-dev] " Daniel Rosenberg via Linux-f2fs-devel
2021-06-03  9:50 ` [PATCH v2 1/2] f2fs: Show casefolding support only when supported Daniel Rosenberg
2021-06-03  9:50   ` [f2fs-dev] " Daniel Rosenberg via Linux-f2fs-devel
2021-06-03 18:20   ` Eric Biggers
2021-06-03 18:20     ` [f2fs-dev] " Eric Biggers
2021-06-04 23:46   ` Chao Yu
2021-06-04 23:46     ` [f2fs-dev] " Chao Yu
2021-06-03  9:50 ` [PATCH v2 2/2] f2fs: Advertise encrypted casefolding in sysfs Daniel Rosenberg
2021-06-03  9:50   ` [f2fs-dev] " Daniel Rosenberg via Linux-f2fs-devel
2021-06-03 10:04   ` Greg KH
2021-06-03 10:04     ` [f2fs-dev] " Greg KH
2021-06-03 15:40     ` Jaegeuk Kim
2021-06-03 15:40       ` [f2fs-dev] " Jaegeuk Kim
2021-06-03 17:26       ` Greg KH [this message]
2021-06-03 17:26         ` Greg KH
2021-06-03 17:53         ` Jaegeuk Kim
2021-06-03 17:53           ` [f2fs-dev] " Jaegeuk Kim
2021-06-03 18:12           ` Greg KH
2021-06-03 18:12             ` [f2fs-dev] " Greg KH
2021-06-03 19:20             ` Jaegeuk Kim
2021-06-03 19:20               ` [f2fs-dev] " Jaegeuk Kim
2021-06-03 20:54             ` David Laight
2021-06-03 20:54               ` [f2fs-dev] " David Laight
2021-06-03 18:26   ` Eric Biggers
2021-06-03 18:26     ` [f2fs-dev] " Eric Biggers
2021-06-03 23:21   ` Eric Biggers
2021-06-03 23:21     ` [f2fs-dev] " Eric Biggers
2021-06-04  4:45     ` Jaegeuk Kim
2021-06-04  4:45       ` [f2fs-dev] " Jaegeuk Kim
2021-06-04  5:01       ` Eric Biggers
2021-06-04  5:01         ` [f2fs-dev] " Eric Biggers
2021-06-04  5:38         ` Jaegeuk Kim
2021-06-04  5:38           ` [f2fs-dev] " Jaegeuk Kim
2021-06-04  5:54           ` Daniel Rosenberg
2021-06-04  5:54             ` [f2fs-dev] " Daniel Rosenberg via Linux-f2fs-devel
2021-06-04 18:58           ` Theodore Ts'o
2021-06-04 18:58             ` [f2fs-dev] " Theodore Ts'o
2021-06-05  0:11           ` Chao Yu
2021-06-05  0:11             ` [f2fs-dev] " Chao Yu
2021-06-05  0:15             ` Jaegeuk Kim
2021-06-05  0:15               ` [f2fs-dev] " Jaegeuk Kim
2021-06-04  8:27       ` David Laight
2021-06-04  8:27         ` [f2fs-dev] " David Laight
2021-06-04  8:33         ` Greg KH
2021-06-04  8:33           ` [f2fs-dev] " Greg KH
2021-06-04 23:46   ` Chao Yu
2021-06-04 23:46     ` [f2fs-dev] " Chao Yu

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