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author | Artem Bityutskiy <artem.bityutskiy@linux.intel.com> | 2013-03-14 10:49:23 +0200 |
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committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-04-12 09:18:08 -0700 |
commit | 1ae92500b8c8b67f02071c38ee0d54701e036e59 (patch) | |
tree | d0181b9c161d167f1017eac0ec93326931fd6e62 /fs/reiserfs/xattr.c | |
parent | 4d20371d4ba4674524ad5f017f16ae68d63bf15a (diff) | |
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UBIFS: make space fixup work in the remount case
commit 67e753ca41782913d805ff4a8a2b0f60b26b7915 upstream.
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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'fs/reiserfs/xattr.c')
0 files changed, 0 insertions, 0 deletions