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From: Gao Xiang <gaoxiang25@huawei.com>
To: Daniel Rosenberg <drosen@google.com>
Cc: Theodore Ts'o <tytso@mit.edu>, <linux-ext4@vger.kernel.org>,
	Jaegeuk Kim <jaegeuk@kernel.org>, Chao Yu <chao@kernel.org>,
	<linux-f2fs-devel@lists.sourceforge.net>,
	Eric Biggers <ebiggers@kernel.org>,
	<linux-fscrypt@vger.kernel.org>,
	Alexander Viro <viro@zeniv.linux.org.uk>,
	Andreas Dilger <adilger.kernel@dilger.ca>,
	Jonathan Corbet <corbet@lwn.net>, <linux-doc@vger.kernel.org>,
	<linux-kernel@vger.kernel.org>, <linux-fsdevel@vger.kernel.org>,
	Gabriel Krisman Bertazi <krisman@collabora.com>,
	<kernel-team@android.com>
Subject: Re: [PATCH 4/8] vfs: Fold casefolding into vfs
Date: Tue, 3 Dec 2019 15:41:54 +0800
Message-ID: <20191203074154.GA216261@architecture4> (raw)
In-Reply-To: <20191203051049.44573-5-drosen@google.com>

On Mon, Dec 02, 2019 at 09:10:45PM -0800, Daniel Rosenberg wrote:
> Ext4 and F2fs are both using casefolding, and they, along with any other
> filesystem that adds the feature, will be using identical dentry_ops.
> Additionally, those dentry ops interfere with the dentry_ops required
> for fscrypt once we add support for casefolding and encryption.
> Moving this into the vfs removes code duplication as well as the
> complication with encryption.
> 
> Currently this is pretty close to just moving the existing f2fs/ext4
> code up a level into the vfs, although there is a lot of room for
> improvement now.
> 
> Signed-off-by: Daniel Rosenberg <drosen@google.com>

I'm afraid that such vfs modification is unneeded.

Just a quick glance it seems just can be replaced by introducing some
.d_cmp, .d_hash helpers (or with little modification) and most non-Android
emulated storage files are not casefolded (even in Android).

"those dentry ops interfere with the dentry_ops required for fscrypt",
I don't think it's a real diffculty and it could be done with some
better approach instead.

Thanks,
Gao Xiang


  reply index

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-12-03  5:10 [PATCH 0/8] Support for Casefolding and Encryption Daniel Rosenberg
2019-12-03  5:10 ` [PATCH 1/8] fscrypt: Add siphash and hash key for policy v2 Daniel Rosenberg
2019-12-03 23:25   ` Eric Biggers
2019-12-03  5:10 ` [PATCH 2/8] fscrypt: Don't allow v1 policies with casefolding Daniel Rosenberg
2019-12-03 23:37   ` Eric Biggers
2019-12-03  5:10 ` [PATCH 3/8] fscrypt: Change format of no-key token Daniel Rosenberg
2019-12-04  0:09   ` Eric Biggers
2019-12-03  5:10 ` [PATCH 4/8] vfs: Fold casefolding into vfs Daniel Rosenberg
2019-12-03  7:41   ` Gao Xiang [this message]
2019-12-03 19:42     ` Gabriel Krisman Bertazi
2019-12-03 20:34       ` Eric Biggers
2019-12-03 21:21         ` Gabriel Krisman Bertazi
2019-12-04  0:32           ` Eric Biggers
2019-12-03 19:31   ` Gabriel Krisman Bertazi
2020-01-03 20:26   ` Theodore Y. Ts'o
2019-12-03  5:10 ` [PATCH 5/8] f2fs: Handle casefolding with Encryption Daniel Rosenberg
2019-12-05  1:17   ` kbuild test robot
2019-12-03  5:10 ` [PATCH 6/8] ext4: Use struct super_block's casefold data Daniel Rosenberg
2019-12-03 19:44   ` Gabriel Krisman Bertazi
2019-12-03  5:10 ` [PATCH 7/8] ext4: Hande casefolding with encryption Daniel Rosenberg
2019-12-03  5:10 ` [PATCH 8/8] ext4: Optimize match for casefolded encrypted dirs Daniel Rosenberg

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