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Fri, 06 Nov 2026 05:37:02 -0800 (PST) Received: from toxicpanda.com ([153.61.196.244]) by smtp.gmail.com with ESMTPSA id 6a1803df08f44-91ea6a2c110sm20707636d6.7.2026.11.06.05.37.01 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 06 Nov 2026 05:37:02 -0800 (PST) From: Josef Bacik Date: Fri, 06 Nov 2026 13:36:44 +0000 Subject: [PATCH v4 2/8] ovl: setup overlayfs' private bdi X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20261106-b4-ovl-containerized-sync-v4-2-6ddde0b7dd8a@toxicpanda.com> References: <20261106-b4-ovl-containerized-sync-v4-0-6ddde0b7dd8a@toxicpanda.com> In-Reply-To: <20261106-b4-ovl-containerized-sync-v4-0-6ddde0b7dd8a@toxicpanda.com> To: Miklos Szeredi , Amir Goldstein , Christian Brauner Cc: Alexander Viro , Jan Kara , Christoph Hellwig , Chris Mason , Chengguang Xu , linux-unionfs@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, Chengguang Xu , Josef Bacik X-Mailer: b4 0.15.2 X-Developer-Signature: v=1; a=openssh-sha256; t=1793972217; l=1000; i=josef@toxicpanda.com; h=from:subject:message-id; bh=oigsy1vUIPeqGe01IWwnaOrpAKAk76udNuQNtC58Mj4=; b=U1NIU0lHAAAAAQAAADMAAAALc3NoLWVkMjU1MTkAAAAgUBr36M/n0nWN0DNbnxwzIiCZez6MG JiruuNaSCI/zXsAAAAGcGF0YXR0AAAAAAAAAAZzaGE1MTIAAABTAAAAC3NzaC1lZDI1NTE5AAAA QH2MMGJo3VtO/g4mpjtSeMtfHkOvY5p3MTJJt5D34LL2yuZaYjI4lVmv6voneKKUnxmg7ImbaT6 mUv/1qHSlZgo= X-Developer-Key: i=josef@toxicpanda.com; a=openssh; fpr=SHA256:C8kOX2QUJCMqnCX+KEeoqRAjLo9L+ELOSH2NSAJHqGA From: Chengguang Xu Setup overlayfs' private bdi so that we can collect overlayfs' own dirty inodes. Signed-off-by: Chengguang Xu [josef: only for an overlay that tracks dirty inodes] Signed-off-by: Josef Bacik --- fs/overlayfs/super.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/fs/overlayfs/super.c b/fs/overlayfs/super.c index 81da70fd53a6..22a8d4eb3b7c 100644 --- a/fs/overlayfs/super.c +++ b/fs/overlayfs/super.c @@ -1490,6 +1490,16 @@ static int ovl_fill_super_creds(struct fs_context *fc, struct super_block *sb) if (!ofs->workdir) sb->s_flags |= SB_RDONLY; + /* + * Dirty overlay inodes go on the lists of this bdi. fsync_mode + * is final once ovl_get_workdir() has returned. + */ + if (ovl_tracks_dirty(ofs)) { + err = super_setup_bdi(sb); + if (err) + return err; + } + sb->s_stack_depth = upper_sb->s_stack_depth; sb->s_time_gran = upper_sb->s_time_gran; } -- 2.55.0