From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mga02.intel.com ([134.134.136.20]) by merlin.infradead.org with esmtp (Exim 4.76 #1 (Red Hat Linux)) id 1SQMGn-0006Mj-4G for linux-mtd@lists.infradead.org; Fri, 04 May 2012 17:26:17 +0000 From: Artem Bityutskiy To: David Woodhouse , MTD Maling List Subject: [PATCH 0/3] do not use s_dirt in JFFS2 Date: Fri, 4 May 2012 20:27:06 +0300 Message-Id: <1336152428-24242-1-git-send-email-dedekind1@gmail.com> Cc: Linux Kernel Maling List List-Id: Linux MTD discussion mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , This patch-set makes JFFS2 file-system stop using the VFS '->write_supers()' call-back because I plan to remove it once all users are gone. The final goal is to get rid of the 'sync_supers()' kernel thread. This kernel thread wakes up every 5 seconds (by default) and calls '->write_super()' for all mounted file-systems. And the bad thing is that this is done even if all the superblocks are clean. Moreover, some file-systems do not even need this end they do not register the '->write_super()' method at all (e.g., btrfs). So 'sync_supers()' most often just generates useless wake-ups and wastes power. I am trying to make all file-systems independent of '->write_super()' and plan to remove 'sync_supers()' and '->write_super' completely once there are no more users. The '->write_supers()' method is mostly used by baroque file-systems like hfs, udf, etc. Modern file-systems like btrfs and xfs do not use it. This justifies removing this stuff from VFS completely and make every FS self-manage own superblock. Note: in the past I was trying to upstream patches which optimized 'sync_super()', but Al Viro wanted me to kill it completely instead, which I am trying to do now, see http://lkml.org/lkml/2010/7/22/96 ====== Overall status: 1. ext4: patches submitted, waiting for reply from Ted Ts'o: https://lkml.org/lkml/2012/4/2/111 Ted keeps silence so far WRT the fate of this patch-set. 2. ext2: patches are in the ext2 tree maintained by Jan Kara: git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs.git for_next 3. Version 3 of FAT FS changes were sent to Andrew and Hirofumi: https://lkml.org/lkml/2012/5/4/183 4. JFFS2 patches are sent being sent now. TODO: affs, exofs, hfs, hfsplus, reiserfs, sysv, udf, ufs ====== fs/fat/fat.h | 1 + fs/fat/fatent.c | 22 +++++++++++++----- fs/fat/inode.c | 54 ++++++++++++++++++++------------------------- include/linux/msdos_fs.h | 3 +- 4 files changed, 43 insertions(+), 37 deletions(-) Thanks, Artem.