mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-06 02:24:14 +08:00
67e753ca41
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+ |
||
---|---|---|
.. | ||
budget.c | ||
commit.c | ||
compress.c | ||
debug.c | ||
debug.h | ||
dir.c | ||
file.c | ||
find.c | ||
gc.c | ||
io.c | ||
ioctl.c | ||
journal.c | ||
Kconfig | ||
key.h | ||
log.c | ||
lprops.c | ||
lpt_commit.c | ||
lpt.c | ||
Makefile | ||
master.c | ||
misc.h | ||
orphan.c | ||
recovery.c | ||
replay.c | ||
sb.c | ||
scan.c | ||
shrinker.c | ||
super.c | ||
tnc_commit.c | ||
tnc_misc.c | ||
tnc.c | ||
ubifs-media.h | ||
ubifs.h | ||
xattr.c |