From: Michael Kerrisk Subject: Documenting MS_LAZYTIME Date: Fri, 20 Feb 2015 09:50:50 +0100 Message-ID: Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: QUOTED-PRINTABLE Cc: Ext4 Developers List , Linux btrfs Developers List , XFS Developers , linux-man-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Linux-Fsdevel , Linux API To: "Theodore Ts'o" Return-path: Sender: linux-man-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org List-Id: linux-ext4.vger.kernel.org Hello Ted, Based on your commit message 0ae45f63d4e, I I wrote the documentation below for MS_LAZYTIME, to go into the mount(2) man page. Could you please check it over and let me know if it's accurate. In particular, I added pieces marked with "*" below that were not part of the commit message and I'd like confirmation that they're accurate. Thanks, Michael [[ MS_LAZYTIME (since Linux 3.20) Only update filetimes (atime, mtime, ctime) on the in- memory version of the file inode. The on-disk time=E2= =80=90 stamps are updated only when: (a) the inode needs to be updated for some change unre=E2= =80=90 lated to file timestamps; (b) the application employs fsync(2), syncfs(2), or sync(2); (c) an undeleted inode is evicted from memory; or * (d) more than 24 hours have passed since the i-node was * written to disk. This mount option significantly reduces writes to the inode table for workloads that perform frequent random writes to preallocated files. * As at Linux 3.20, this option is supported only on ext4. ]] --=20 Michael Kerrisk Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/ Author of "The Linux Programming Interface", http://blog.man7.org/ -- To unsubscribe from this list: send the line "unsubscribe linux-man" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html