• Theodore Ts'o's avatar
    fs: push sync_filesystem() down to the file system's remount_fs() · 02b9984d
    Theodore Ts'o authored
    Previously, the no-op "mount -o mount /dev/xxx" operation when the
    file system is already mounted read-write causes an implied,
    unconditional syncfs().  This seems pretty stupid, and it's certainly
    documented or guaraunteed to do this, nor is it particularly useful,
    except in the case where the file system was mounted rw and is getting
    remounted read-only.
    
    However, it's possible that there might be some file systems that are
    actually depending on this behavior.  In most file systems, it's
    probably fine to only call sync_filesystem() when transitioning from
    read-write to read-only, and there are some file systems where this is
    not needed at all (for example, for a pseudo-filesystem or something
    like romfs).
    Signed-off-by: 's avatar"Theodore Ts'o" <tytso@mit.edu>
    Cc: linux-fsdevel@vger.kernel.org
    Cc: Christoph Hellwig <hch@infradead.org>
    Cc: Artem Bityutskiy <dedekind1@gmail.com>
    Cc: Adrian Hunter <adrian.hunter@intel.com>
    Cc: Evgeniy Dushistov <dushistov@mail.ru>
    Cc: Jan Kara <jack@suse.cz>
    Cc: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
    Cc: Anders Larsen <al@alarsen.net>
    Cc: Phillip Lougher <phillip@squashfs.org.uk>
    Cc: Kees Cook <keescook@chromium.org>
    Cc: Mikulas Patocka <mikulas@artax.karlin.mff.cuni.cz>
    Cc: Petr Vandrovec <petr@vandrovec.name>
    Cc: xfs@oss.sgi.com
    Cc: linux-btrfs@vger.kernel.org
    Cc: linux-cifs@vger.kernel.org
    Cc: samba-technical@lists.samba.org
    Cc: codalist@coda.cs.cmu.edu
    Cc: linux-ext4@vger.kernel.org
    Cc: linux-f2fs-devel@lists.sourceforge.net
    Cc: fuse-devel@lists.sourceforge.net
    Cc: cluster-devel@redhat.com
    Cc: linux-mtd@lists.infradead.org
    Cc: jfs-discussion@lists.sourceforge.net
    Cc: linux-nfs@vger.kernel.org
    Cc: linux-nilfs@vger.kernel.org
    Cc: linux-ntfs-dev@lists.sourceforge.net
    Cc: ocfs2-devel@oss.oracle.com
    Cc: reiserfs-devel@vger.kernel.org
    02b9984d
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