[yaffs]Strange umount/remount problem on yaffs!

[Charles Manning]

Hi

Lost data over an unmout/remout cycle is almost certainly due to an issue in 
the spare/OOB area such that the placement being done by mtd is not what is 
expected by yaffs.

-- Charles


On Tuesday 06 September 2005 18:39, Jian Zhang wrote:
> hi,
>  I use yaffs(the latest cvs from aleph1) on linux-2.4.21 with backported
>  mtd(mtd20040705).there is no problem on the first mount.but it seems
>  like lost data when i umount it then remount it.here is my log:
>  1)reset and system run
>  2)flash_eraseall /dev/mtd/0 &&insmod yaffs.o
>  3)mount -t yaffs /dev/mtdblock/0 ./yaffs_mnt
>  4)/yaffs/yaffs_mnt # cp /home/www/rtc_ds1337.o ./
>  5)/yaffs/yaffs_mnt # ls -l
>  drw-rw-rw-    1 root     root          512 Jan  1 04:23 lost+found
>  -rw-r--r--    1 root     root        10745 Jan  1 04:22 rtc_ds1337.o
>  6)/yaffs/yaffs_mnt # insmod rtc_ds1337.o
>  Using rtc_ds1337.o
>  7)/yaffs # umount yaffs_mnt/
>  mtdblock_release
>  ok
>  8)/yaffs # mount -t yaffs /dev/mtdblock/0 ./yaffs_mnt/
>  mtdblock_open
>  ok
>  yaffs: Attempting MTD mount on 31.0, "1f:00"
>  9)/yaffs/yaffs_mnt # ls -l
>  drw-rw-rw-    1 root     root          512 Jan  1 04:23 lost+found
>  -rw-r--r--    1 root     root        10745 Jan  1 04:22 rtc_ds1337.o
>  ***you will see the file size is the same as 5)
>  10)/yaffs/yaffs_mnt # insmod rtc_ds1337.o
>  Using rtc_ds1337.o
>  pc : [<4014b5b4>]    lr : [<00043888>]    Not tainted
>  sp : bfffd768  ip : bfffd7e4  fp : bfffd7e0
>  r10: bfffd9f8  r9 : 00000009  r8 : 000a5df8
>  r7 : 00000000  r6 : 001b63b8  r5 : 001b6f48  r4 : 001b6c48
>  r3 : 00000000  r2 : 00000009  r1 : 000a5df8  r0 : 00000000
>  Flags: nzCv  IRQs on  FIQs on  Mode USER_32  Segment user
>  Control: C000717F  Table: 05F90000  DAC: 00000015
>  Segmentation fault
>
>  i have do as this for times ,it has the same result! so i do consider
>  it lose data when umount it.any body can give me some hints?
>  thanks!
>
>  JianZhang
>
>
>
>
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