>Date: Sun, 13 Nov 2005 12:10:10 +1300
>From: Charles Manning <manningc2@actrix.gen.nz>
>Subject: [Yaffs]Maybe some issue about GC on yaffs2!
>To: yaffs@stoneboat.aleph1.co.uk
>Cc: Jian Zhang <zj0659@sina.com>
>Message-ID: <200511131210.10438.manningc2@actrix.gen.nz>
>Content-Type: text/plain;  charset="utf-8"
>...
>...
>The problem is being caused by mtd not giving back what you wrote itno it.
>This is almost certainly caused by corruption of the oob area in mtd.
>
>-- CHarles
hi,
Thanks for Charle's reply! I have updated nand_base.c in MTD, and
this problem is fixed. But another problem is appear! all is ok 
except when i do umount/remount. it seems like lost some space when
umount/remount. I have dig into the mtd driver but can't find any 
hints which can cause this problem. here is my log of operations.
any comments will  welcome!
Best Regards!
Jiang Zhang
1)*****eraseall
2)*****mount
3)*****cat /proc/yaffs
Device 0 "EP9312 USER"
startBlock......... 0
endBlock........... 2047
chunkGroupBits..... 2
chunkGroupSize..... 4
nErasedBlocks...... 2048
nTnodesCreated..... 0
nFreeTnodes........ 0
nObjectsCreated.... 100
nFreeObjects....... 96
nFreeChunks........ 131072
nPageWrites........ 0
nPageReads......... 0
nBlockErasures..... 0
nGCCopies.......... 0
garbageCollections. 0
passiveGCs......... 0
nRetriedWrites..... 0
nRetireBlocks...... 0
eccFixed........... 0
eccUnfixed......... 0
tagsEccFixed....... 0
tagsEccUnfixed..... 0
cacheHits.......... 0
nDeletedFiles...... 0
nUnlinkedFiles..... 0
nBackgroudDeletions 0
useNANDECC......... 1
isYaffs2........... 1
4)*****df
/dev/mtdblock/5         262144       768    261376   0% /mnt/nfs
5)*****cp files to yaffs
6)*****cat /proc/yaffs
Device 0 "EP9312 USER"
startBlock......... 0
endBlock........... 2047
chunkGroupBits..... 2
chunkGroupSize..... 4
nErasedBlocks...... 921
nTnodesCreated..... 5500
nFreeTnodes........ 65
nObjectsCreated.... 1000
nFreeObjects....... 38
nFreeChunks........ 62488
nPageWrites........ 0
nPageReads......... 0
nBlockErasures..... 0
nGCCopies.......... 0
garbageCollections. 0
passiveGCs......... 0
nRetriedWrites..... 0
nRetireBlocks...... 0
eccFixed........... 0
eccUnfixed......... 0
tagsEccFixed....... 0
tagsEccUnfixed..... 0
cacheHits.......... 0
nDeletedFiles...... 0
nUnlinkedFiles..... 0
nBackgroudDeletions 0
useNANDECC......... 1
isYaffs2........... 1
7)*****df
/dev/mtdblock/5         262144    137936    124208  53% /mnt/nfs
8)*****umount
9)*****remount
10)*****cat /proc/yaffs
Device 0 "EP9312 USER"
startBlock......... 0
endBlock........... 2047
chunkGroupBits..... 2
chunkGroupSize..... 4
nErasedBlocks...... 921
nTnodesCreated..... 5500
nFreeTnodes........ 65
nObjectsCreated.... 1000
nFreeObjects....... 38
nFreeChunks........ 62488
nPageWrites........ 0
nPageReads......... 0
nBlockErasures..... 0
nGCCopies.......... 0
garbageCollections. 0
passiveGCs......... 0
nRetriedWrites..... 0
nRetireBlocks...... 0
eccFixed........... 0
eccUnfixed......... 0
tagsEccFixed....... 0
tagsEccUnfixed..... 0
cacheHits.......... 0
nDeletedFiles...... 0
nUnlinkedFiles..... 0
nBackgroudDeletions 0
useNANDECC......... 1
isYaffs2........... 1
11)*****df
/dev/mtdblock/5         262144    137936    124208  53% /mnt/nfs
12)*****rm file
rm: unable to remove `./lib/gconv': Directory not empty
rm: unable to remove `./lib': Directory not empty
rm: unable to remove `./lib2/gconv': Directory not empty
rm: unable to remove `./lib2': Directory not empty
rm: unable to remove `./lost+found': Directory not empty
13)*****cat /proc/yaffs
Device 0 "EP9312 USER"
startBlock......... 0
endBlock........... 2047
chunkGroupBits..... 2
chunkGroupSize..... 4
chunkGroupSize..... 4
nTnodesCreated..... 5500

nFreeTnodes........ 4877
nObjectsCreated.... 1000
nFreeObjects....... 373
nFreeChunks........ 130449
nPageWrites........ 0
nPageReads......... 0
nBlockErasures..... 263
nGCCopies.......... 0
garbageCollections. 263
passiveGCs......... 263
nRetriedWrites..... 0
nRetireBlocks...... 0
eccFixed........... 0
eccUnfixed......... 0
tagsEccFixed....... 0
tagsEccUnfixed..... 0
cacheHits.......... 0
nDeletedFiles...... 820
nUnlinkedFiles..... 1293
nBackgroudDeletions 0
useNANDECC......... 1
isYaffs2........... 1
14)*****df
/dev/mtdblock/5         262144      2016    260128   1% /mnt/nfs
15)*****umount
16)*****remount
17)*****cat /proc/yaffs
Device 0 "EP9312 USER"
startBlock......... 0
endBlock........... 2047
chunkGroupBits..... 2
chunkGroupSize..... 4
nErasedBlocks...... 1163
nTnodesCreated..... 4400
nFreeTnodes........ 214
nObjectsCreated.... 1000
nFreeObjects....... 373
nFreeChunks........ 78597
nPageWrites........ 0
nPageReads......... 0
nBlockErasures..... 0
nGCCopies.......... 0
garbageCollections. 0
passiveGCs......... 0
nRetriedWrites..... 0
nRetireBlocks...... 0
eccFixed........... 0
eccUnfixed......... 0
tagsEccFixed....... 0
tagsEccUnfixed..... 0
cacheHits.......... 0
nDeletedFiles...... 0
nUnlinkedFiles..... 958
nBackgroudDeletions 0
useNANDECC......... 1
isYaffs2........... 1
18)*****df
/dev/mtdblock/5         262144    105720    156424  40% /mnt/nfs
here, I can see nothing in NAND flash, but if I copy some files beyond 
156M, it will report "Cannot allocate memory".