From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id F06F34FF842; Thu, 8 Jan 2026 14:21:06 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.137.202.133 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1767882068; cv=none; b=thYVY/OU1fYY2RACCXYvTQYbFu44mcT27M7OYagcZcDUuvYKXt9KsVEVp0KVRENjLVX701VmhD++WQDx74dBOcRvnv+wc1HSeROlM0NfgM/11+QN4ZbxS0g9O8pmXfGpElDSnIMUCH6zyg3EhTY8MN+D/r9dIvLLChpdXBONGqU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1767882068; c=relaxed/simple; bh=sWRDWgR+AQbA40dgr/mtOYcKgGp8x2pClWq5wVlhEf4=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=Z+S8OOipUVy9LYSAuZdrOfBBf+xY8wA2tOC3HU8mlT2/OBhQnqPiB6H6huvO8w6K/RUJLgWxVbqy28Z7VZfvT7vGj/dCahdJN3c0qEmkathpiQWZQkBNYRJcx5iHXt09rOHTiM8vOvj+yh1Xd0OrvZEZYdgaGdm2rCzBxAdkLj4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=lst.de; spf=none smtp.mailfrom=bombadil.srs.infradead.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b=H0Hx47GU; arc=none smtp.client-ip=198.137.202.133 Authentication-Results: smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=lst.de Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=bombadil.srs.infradead.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="H0Hx47GU" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20210309; h=Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-ID:Date:Subject:Cc:To:From:Sender :Reply-To:Content-Type:Content-ID:Content-Description; bh=umifNtNgLmyvzlwo5GetVQnsGgQ+5QSJwODRNDbwxqk=; b=H0Hx47GUehvTzEEd/jEXZXdSAS eZ57jHvkuzRc1xzKov0EAXhjVO8k3Jrj8vlKqjOCHeE4J19/JvxJNUwDCDlcjn+w08kmeRKSsoAWM 0nun/EI+1OI1ooXr1b5OBkYQIii0U3RLXkfcbNw/quqS3KtvXCrsOcehr3xKyYSpJKB6kg2fmOlap R2Y6gBXLAuKa6BoKNVc3hwkIBijGXiJ/ssYvO0OxTtThGkBRxOpV54UbW3AzcvUKFQmWl3vhfwkb6 ccMXUlfJAGd53F8sKRl3G6iKXeZNPybwpvgYMo7N1vZ7ravyqJexC0gZdV8cZOtULejEEOPGxdYWA 5EovUYdQ==; Received: from 2a02-8389-2341-5b80-d601-7564-c2e0-491c.cable.dynamic.v6.surfer.at ([2a02:8389:2341:5b80:d601:7564:c2e0:491c] helo=localhost) by bombadil.infradead.org with esmtpsa (Exim 4.98.2 #2 (Red Hat Linux)) id 1vdqsp-0000000HJj2-2gCe; Thu, 08 Jan 2026 14:21:04 +0000 From: Christoph Hellwig To: Christian Brauner Cc: Al Viro , David Sterba , Jan Kara , Mike Marshall , Martin Brandenburg , Carlos Maiolino , Stefan Roesch , Jeff Layton , OGAWA Hirofumi , Trond Myklebust , Anna Schumaker , linux-kernel@vger.kernel.org, linux-btrfs@vger.kernel.org, linux-fsdevel@vger.kernel.org, gfs2@lists.linux.dev, io-uring@vger.kernel.org, devel@lists.orangefs.org, linux-unionfs@vger.kernel.org, linux-mtd@lists.infradead.org, linux-xfs@vger.kernel.org, linux-nfs@vger.kernel.org, Chaitanya Kulkarni Subject: [PATCH 07/11] fs: add a ->sync_lazytime method Date: Thu, 8 Jan 2026 15:19:07 +0100 Message-ID: <20260108141934.2052404-8-hch@lst.de> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260108141934.2052404-1-hch@lst.de> References: <20260108141934.2052404-1-hch@lst.de> Precedence: bulk X-Mailing-List: io-uring@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html Allow the file system to explicitly implement lazytime syncing instead of pigging back on generic inode dirtying. This allows to simplify the XFS implementation and prepares for non-blocking lazytime timestamp updates. Signed-off-by: Christoph Hellwig Reviewed-by: Chaitanya Kulkarni Reviewed-by: Jeff Layton --- Documentation/filesystems/locking.rst | 2 ++ Documentation/filesystems/vfs.rst | 6 ++++++ fs/fs-writeback.c | 13 +++++++++++-- include/linux/fs.h | 1 + 4 files changed, 20 insertions(+), 2 deletions(-) diff --git a/Documentation/filesystems/locking.rst b/Documentation/filesystems/locking.rst index 37a4a7fa8094..0312fba6d73b 100644 --- a/Documentation/filesystems/locking.rst +++ b/Documentation/filesystems/locking.rst @@ -82,6 +82,7 @@ prototypes:: int (*fiemap)(struct inode *, struct fiemap_extent_info *, u64 start, u64 len); void (*update_time)(struct inode *inode, enum fs_update_time type, int flags); + void (*sync_lazytime)(struct inode *inode); int (*atomic_open)(struct inode *, struct dentry *, struct file *, unsigned open_flag, umode_t create_mode); @@ -118,6 +119,7 @@ getattr: no listxattr: no fiemap: no update_time: no +sync_lazytime: no atomic_open: shared (exclusive if O_CREAT is set in open flags) tmpfile: no fileattr_get: no or exclusive diff --git a/Documentation/filesystems/vfs.rst b/Documentation/filesystems/vfs.rst index 51aa9db64784..d8cb181f69f8 100644 --- a/Documentation/filesystems/vfs.rst +++ b/Documentation/filesystems/vfs.rst @@ -487,6 +487,7 @@ As of kernel 2.6.22, the following members are defined: ssize_t (*listxattr) (struct dentry *, char *, size_t); void (*update_time)(struct inode *inode, enum fs_update_time type, int flags); + void (*sync_lazytime)(struct inode *inode); int (*atomic_open)(struct inode *, struct dentry *, struct file *, unsigned open_flag, umode_t create_mode); int (*tmpfile) (struct mnt_idmap *, struct inode *, struct file *, umode_t); @@ -643,6 +644,11 @@ otherwise noted. an inode. If this is not defined the VFS will update the inode itself and call mark_inode_dirty_sync. +``sync_lazytime``: + called by the writeback code to update the lazy time stamps to + regular time stamp updates that get syncing into the on-disk + inode. + ``atomic_open`` called on the last component of an open. Using this optional method the filesystem can look up, possibly create and open the diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c index 3d68b757136c..62658be2578b 100644 --- a/fs/fs-writeback.c +++ b/fs/fs-writeback.c @@ -1717,7 +1717,10 @@ bool sync_lazytime(struct inode *inode) return false; trace_writeback_lazytime(inode); - mark_inode_dirty_sync(inode); + if (inode->i_op->sync_lazytime) + inode->i_op->sync_lazytime(inode); + else + mark_inode_dirty_sync(inode); return true; } @@ -2569,6 +2572,8 @@ void __mark_inode_dirty(struct inode *inode, int flags) trace_writeback_mark_inode_dirty(inode, flags); if (flags & I_DIRTY_INODE) { + bool was_dirty_time = false; + /* * Inode timestamp update will piggback on this dirtying. * We tell ->dirty_inode callback that timestamps need to @@ -2579,6 +2584,7 @@ void __mark_inode_dirty(struct inode *inode, int flags) if (inode_state_read(inode) & I_DIRTY_TIME) { inode_state_clear(inode, I_DIRTY_TIME); flags |= I_DIRTY_TIME; + was_dirty_time = true; } spin_unlock(&inode->i_lock); } @@ -2591,9 +2597,12 @@ void __mark_inode_dirty(struct inode *inode, int flags) * for just I_DIRTY_PAGES or I_DIRTY_TIME. */ trace_writeback_dirty_inode_start(inode, flags); - if (sb->s_op->dirty_inode) + if (sb->s_op->dirty_inode) { sb->s_op->dirty_inode(inode, flags & (I_DIRTY_INODE | I_DIRTY_TIME)); + } else if (was_dirty_time && inode->i_op->sync_lazytime) { + inode->i_op->sync_lazytime(inode); + } trace_writeback_dirty_inode(inode, flags); /* I_DIRTY_INODE supersedes I_DIRTY_TIME. */ diff --git a/include/linux/fs.h b/include/linux/fs.h index 35b3e6c6b084..7837db1ba1d2 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -2024,6 +2024,7 @@ struct inode_operations { u64 len); int (*update_time)(struct inode *inode, enum fs_update_time type, unsigned int flags); + void (*sync_lazytime)(struct inode *inode); int (*atomic_open)(struct inode *, struct dentry *, struct file *, unsigned open_flag, umode_t create_mode); -- 2.47.3