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Theodore Ts'o 02b9984d64 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
 		2014-03-13 10:14:33 -04:00
..
Kconfig Squashfs: Directly decompress into the page cache for file data 2013-11-20 03:59:13 +00:00
Makefile Squashfs: Directly decompress into the page cache for file data 2013-11-20 03:59:13 +00:00
block.c Squashfs: Generalise paging handling in the decompressors 2013-11-20 03:59:01 +00:00
cache.c Squashfs: Generalise paging handling in the decompressors 2013-11-20 03:59:01 +00:00
decompressor.c Squashfs: Generalise paging handling in the decompressors 2013-11-20 03:59:01 +00:00
decompressor.h Squashfs: Generalise paging handling in the decompressors 2013-11-20 03:59:01 +00:00
decompressor_multi.c Squashfs: Check stream is not NULL in decompressor_multi.c 2013-11-20 03:59:20 +00:00
decompressor_multi_percpu.c Squashfs: Generalise paging handling in the decompressors 2013-11-20 03:59:01 +00:00
decompressor_single.c Squashfs: Generalise paging handling in the decompressors 2013-11-20 03:59:01 +00:00
dir.c Squashfs: add corruption check for type in squashfs_readdir() 2013-09-06 04:57:54 +01:00
export.c Squashfs: Fix sanity check patches on big-endian systems 2011-05-29 10:03:09 +01:00
file.c Squashfs: Restructure squashfs_readpage() 2013-11-20 03:59:07 +00:00
file_cache.c Squashfs: Restructure squashfs_readpage() 2013-11-20 03:59:07 +00:00
file_direct.c Squashfs: fix failure to unlock pages on decompress error 2013-11-24 01:02:50 +00:00
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 userns: Convert squashfs to use kuid/kgid where appropriate 2012-09-21 03:13:35 -07:00
lzo_wrapper.c Squashfs: Generalise paging handling in the decompressors 2013-11-20 03:59:01 +00:00
namei.c Squashfs: fix corruption checks in squashfs_lookup() 2013-09-06 04:57:53 +01:00
page_actor.c Squashfs: Directly decompress into the page cache for file data 2013-11-20 03:59:13 +00:00
page_actor.h Squashfs: Directly decompress into the page cache for file data 2013-11-20 03:59:13 +00:00
squashfs.h Squashfs: Restructure squashfs_readpage() 2013-11-20 03:59:07 +00:00
squashfs_fs.h Squashfs: add corruption check for type in squashfs_readdir() 2013-09-06 04:57:54 +01:00
squashfs_fs_i.h Squashfs: update email address 2011-05-26 10:49:11 +01:00
squashfs_fs_sb.h Squashfs: Generalise paging handling in the decompressors 2013-11-20 03:59:01 +00:00
super.c fs: push sync_filesystem() down to the file system's remount_fs() 2014-03-13 10:14:33 -04:00
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: Generalise paging handling in the decompressors 2013-11-20 03:59:01 +00:00
zlib_wrapper.c Squashfs: Generalise paging handling in the decompressors 2013-11-20 03:59:01 +00:00