linux/fs/ubifs
Artem Bityutskiy 67e753ca41 UBIFS: make space fixup work in the remount case
The UBIFS space fixup is a useful feature which allows to fixup the "broken"
flash space at the time of the first mount. The "broken" space is usually the
result of using a "dumb" industrial flasher which is not able to skip empty
NAND pages and just writes all 0xFFs to the empty space, which has grave
side-effects for UBIFS when UBIFS trise to write useful data to those empty
pages.

The fix-up feature works roughly like this:
1. mkfs.ubifs sets the fixup flag in UBIFS superblock when creating the image
   (see -F option)
2. when the file-system is mounted for the first time, UBIFS notices the fixup
   flag and re-writes the entire media atomically, which may take really a lot
   of time.
3. UBIFS clears the fixup flag in the superblock.

This works fine when the file system is mounted R/W for the very first time.
But it did not really work in the case when we first mount the file-system R/O,
and then re-mount R/W. The reason was that we started the fixup procedure too
late, which we cannot really do because we have to fixup the space before it
starts being used.

Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Reported-by: Mark Jackson <mpfj-list@mimc.co.uk>
Cc: stable@vger.kernel.org # 3.0+
2013-03-14 11:20:22 +02:00
..
budget.c No big changes for 3.7 in UBIFS: 2012-10-02 20:47:48 -07:00
commit.c UBIFS: print less 2012-08-31 17:32:58 +03:00
compress.c UBIFS: comply with coding style 2012-08-31 17:32:57 +03:00
debug.c UBIFS: rename random32() to prandom_u32() 2013-01-15 15:45:27 +02:00
debug.h UBIFS: print less 2012-08-31 17:32:58 +03:00
dir.c new helper: file_inode(file) 2013-02-22 23:31:31 -05:00
file.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2013-02-26 20:16:07 -08:00
find.c UBIFS: fix mounting problems after power cuts 2012-10-26 16:26:44 +03:00
gc.c UBIFS: comply with coding style 2012-08-31 17:32:57 +03:00
io.c UBI: Kill data type hint 2012-05-20 20:25:59 +03:00
ioctl.c new helper: file_inode(file) 2013-02-22 23:31:31 -05:00
journal.c userns: Convert ubifs to use kuid/kgid 2012-09-21 03:13:36 -07:00
Kconfig UBIFS: remove Kconfig debugging option 2012-05-16 19:53:46 +03:00
key.h UBIFS: mark unused key objects as invalid 2010-08-30 10:19:08 +03:00
log.c UBIFS: comply with coding style 2012-08-31 17:32:57 +03:00
lprops.c UBIFS: introduce categorized lprops counter 2012-10-26 16:00:26 +03:00
lpt_commit.c UBIFS: rename random32() to prandom_u32() 2013-01-15 15:45:27 +02:00
lpt.c UBIFS: print less 2012-08-31 17:32:58 +03:00
Makefile UBIFS: remove Kconfig debugging option 2012-05-16 19:53:46 +03:00
master.c UBI: Kill data type hint 2012-05-20 20:25:59 +03:00
misc.h UBIFS: introduce more I/O helpers 2011-07-04 10:54:33 +03:00
orphan.c UBIFS: fix double free of ubifs_orphan objects 2013-02-04 12:31:48 +02:00
recovery.c UBIFS: comply with coding style 2012-08-31 17:32:57 +03:00
replay.c UBIFS: print less 2012-08-31 17:32:58 +03:00
sb.c No big changes for 3.7 in UBIFS: 2012-10-02 20:47:48 -07:00
scan.c UBIFS: comply with coding style 2012-08-31 17:32:57 +03:00
shrinker.c UBIFS: fix shrinker object count reports 2011-06-03 18:12:24 +03:00
super.c UBIFS: make space fixup work in the remount case 2013-03-14 11:20:22 +02:00
tnc_commit.c UBIFS: rename random32() to prandom_u32() 2013-01-15 15:45:27 +02:00
tnc_misc.c UBIFS: print less 2012-08-31 17:32:58 +03:00
tnc.c UBIFS: 2012-05-22 19:30:27 -07:00
ubifs-media.h UBIFS: add a superblock flag for free space fix-up 2011-05-16 14:12:14 +03:00
ubifs.h UBIFS: fix double free of ubifs_orphan objects 2013-02-04 12:31:48 +02:00
xattr.c UBIFS: 2012-05-22 19:30:27 -07:00