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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 Merge git://git.kernel.org/pub/scm/linux/kernel/git/pkl/squashfs-next 2011-11-04 16:48:37 -07:00
Makefile Squashfs: Make ZLIB compression support optional 2011-07-22 03:01:28 +01:00
block.c Squashfs: update comment removing reference to zlib only 2012-03-10 03:01:00 +00:00
cache.c Squashfs: optimise squashfs_cache_get entry search 2011-12-30 01:24:13 +00:00
decompressor.c Squashfs: Make ZLIB compression support optional 2011-07-22 03:01:28 +01:00
decompressor.h Squashfs: Make ZLIB compression support optional 2011-07-22 03:01:28 +01:00
dir.c Squashfs: fix f_pos check in get_dir_index_using_offset 2012-03-10 03:01:02 +00:00
export.c Squashfs: Fix sanity check patches on big-endian systems 2011-05-29 10:03:09 +01:00
file.c squashfs: remove the second argument of k[un]map_atomic() 2012-03-20 21:48:25 +08:00
fragment.c Squashfs: Fix sanity check patches on big-endian systems 2011-05-29 10:03:09 +01:00
id.c Squashfs: Fix sanity check patches on big-endian systems 2011-05-29 10:03:09 +01:00
inode.c Squashfs: fix i_blocks calculation with extended regular files 2012-01-03 04:00:43 +00:00
lzo_wrapper.c Squashfs: extend decompressor framework to handle compression options 2011-02-28 18:21:59 +00:00
namei.c stop passing nameidata to ->lookup() 2018-12-07 22:26:28 +04:00
squashfs.h Squashfs: Make ZLIB compression support optional 2011-07-22 03:01:28 +01:00
squashfs_fs.h Squashfs: get rid of obsolete definitions in header file 2012-03-10 03:01:01 +00:00
squashfs_fs_i.h Squashfs: update email address 2011-05-26 10:49:11 +01:00
squashfs_fs_sb.h Squashfs: optimise squashfs_cache_get entry search 2011-12-30 01:24:13 +00:00
super.c fs: push sync_filesystem() down to the file system's remount_fs() 2020-11-19 11:23:46 +01:00
symlink.c squashfs: remove the second argument of k[un]map_atomic() 2012-03-20 21:48:25 +08:00
xattr.c Squashfs: update email address 2011-05-26 10:49:11 +01:00
xattr.h Squashfs: update email address 2011-05-26 10:49:11 +01:00
xattr_id.c Squashfs: update email address 2011-05-26 10:49:11 +01:00
xz_wrapper.c Squashfs: update email address 2011-05-26 10:49:11 +01:00
zlib_wrapper.c Squashfs: update email address 2011-05-26 10:49:11 +01:00