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Sat, 21 Nov 2020 21:12:33 -0800 (PST) X-Google-Smtp-Source: ABdhPJwhkBDDpVzvwVvP6QvR7b7bk5JCtZ4ytNenw2ZosC6tbrjTUa7xakgrk4oLyDhCHqqDiw3bXw== X-Received: by 2002:a63:4513:: with SMTP id s19mr22764154pga.254.1606021953454; Sat, 21 Nov 2020 21:12:33 -0800 (PST) Received: from xiangao.remote.csb ([209.132.188.80]) by smtp.gmail.com with ESMTPSA id b21sm9346038pji.24.2020.11.21.21.12.26 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 21 Nov 2020 21:12:33 -0800 (PST) Date: Sun, 22 Nov 2020 13:12:18 +0800 From: Gao Xiang To: Daniel Rosenberg Subject: Re: [PATCH v4 2/3] fscrypt: Have filesystems handle their d_ops Message-ID: <20201122051218.GA2717478@xiangao.remote.csb> References: <20201119060904.463807-1-drosen@google.com> <20201119060904.463807-3-drosen@google.com> MIME-Version: 1.0 In-Reply-To: <20201119060904.463807-3-drosen@google.com> User-Agent: Mutt/1.10.1 (2018-07-13) Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=hsiangkao@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Disposition: inline X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20201122_001403_520850_16F6B2EA X-CRM114-Status: GOOD ( 16.98 ) X-BeenThere: linux-mtd@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux MTD discussion mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: kernel-team@android.com, "Theodore Y . Ts'o" , Eric Biggers , Richard Weinberger , Chao Yu , linux-kernel@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net, Eric Biggers , linux-fscrypt@vger.kernel.org, Andreas Dilger , Alexander Viro , linux-mtd@lists.infradead.org, linux-fsdevel@vger.kernel.org, Jaegeuk Kim , linux-ext4@vger.kernel.org, Gabriel Krisman Bertazi Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-mtd" Errors-To: linux-mtd-bounces+linux-mtd=archiver.kernel.org@lists.infradead.org Hi all, On Thu, Nov 19, 2020 at 06:09:03AM +0000, Daniel Rosenberg wrote: > This shifts the responsibility of setting up dentry operations from > fscrypt to the individual filesystems, allowing them to have their own > operations while still setting fscrypt's d_revalidate as appropriate. > > Most filesystems can just use generic_set_encrypted_ci_d_ops, unless > they have their own specific dentry operations as well. That operation > will set the minimal d_ops required under the circumstances. > > Since the fscrypt d_ops are set later on, we must set all d_ops there, > since we cannot adjust those later on. This should not result in any > change in behavior. > > Signed-off-by: Daniel Rosenberg > Acked-by: Eric Biggers > --- ... > extern const struct file_operations ext4_dir_operations; > > -#ifdef CONFIG_UNICODE > -extern const struct dentry_operations ext4_dentry_ops; > -#endif > - > /* file.c */ > extern const struct inode_operations ext4_file_inode_operations; > extern const struct file_operations ext4_file_operations; > diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c > index 33509266f5a0..12a417ff5648 100644 > --- a/fs/ext4/namei.c > +++ b/fs/ext4/namei.c > @@ -1614,6 +1614,7 @@ static struct buffer_head *ext4_lookup_entry(struct inode *dir, > struct buffer_head *bh; > > err = ext4_fname_prepare_lookup(dir, dentry, &fname); > + generic_set_encrypted_ci_d_ops(dentry); One thing might be worth noticing is that currently overlayfs might not work properly when dentry->d_sb->s_encoding is set even only some subdirs are CI-enabled but the others not, see generic_set_encrypted_ci_d_ops(), ovl_mount_dir_noesc => ovl_dentry_weird() For more details, see: https://android-review.googlesource.com/c/device/linaro/hikey/+/1483316/2#message-2e1f6ab0010a3e35e7d8effea73f60341f84ee4d Just found it by chance (and not sure if it's vital for now), and a kind reminder about this. Thanks, Gao Xiang ______________________________________________________ Linux MTD discussion mailing list http://lists.infradead.org/mailman/listinfo/linux-mtd/