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Theodore Ts'o b84ec752b0 fs: push sync_filesystem() down to the file system's remount_fs() 
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: "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
Change-Id: I03b43c745f82fce2cd3e0856c42eda70d94a45f8
 		2020-11-19 11:23:46 +01:00
..
Kconfig bitops: remove minix bitops from asm/bitops.h 2011-03-23 19:46:22 -07:00
Makefile
…
bitmap.c minix: propagate umode_t 2012-01-03 22:54:59 -05:00
dir.c minix: remove the second argument of k[un]map_atomic() 2012-03-20 21:48:24 +08:00
file.c remove inode_setattr 2010-08-09 16:47:37 -04:00
inode.c fs: push sync_filesystem() down to the file system's remount_fs() 2020-11-19 11:23:46 +01:00
itree_common.c
…
itree_v1.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
itree_v2.c fs/minix: bugfix, number of indirect block ptrs per block depends on block size 2010-05-27 22:06:22 -04:00
minix.h vfs: check i_nlink limits in vfs_{mkdir,rename_dir,link} 2012-03-20 21:29:32 -04:00
namei.c [O_TMPFILE] it's still short a few helpers, but infrastructure should be OK now... 2018-12-07 22:28:48 +04:00