I have some questions:

* Can you plesae redo this using  "ls -ial" rather than "ls -l". That will 
show extra useful info.
* Can you please see if there is anything in lost+found
* Please show /proc/yaffs before the rm and after the reboot
* Does the problem get cleared up by umount and mount?

-- CHarles


On Tuesday 19 May 2009 22:28:32 Babrian Viktor wrote:
> Hi all,
>
> I experience a strange phenomenon if I do a power cycle during performing
> a file removal. It is easily reproduceable (at least using my setup).
> I am using a fairly new (on week old or so) version of yaffs2, kernel
> version 2.6.26, yaffs_guts.c version: 1.82.
> (however I also got the very same results with a somewhat older version)
> (note: all other functionality seems to be OK)
>
> Here is what I do briefly:
> - flash_eraseall /dev/mtd13
> - mount as yaffs2
> - creating 2 files (dd if=/dev/zero of=/mnt/file bs=1M count=100)
> - removing the second one (interrupted by power cycle)
> - reboot, mount
> - df, ls show things correctly
> - now I re-create the second file
> - ls is correct
> - df shows much less free space than expected (the usable space is
> limited; free space is 'lost')
>
>
> here is what I do exactly:
> (flash_erase, mount not included, started from creating the second file)
> / $ ls -l /mnt
> -rw-r--r--    1 root     root    104857600 Jan  1 00:04 file
> drw-rw-rw-    1 root     root         2048 Jan  1 00:00 lost+found
> / $ df
> Filesystem           1k-blocks      Used Available Use% Mounted on
> /dev/mtdblock5           32768     18184     14584  55% /
> tmpfs                    63956         0     63956   0% /var/tmp
> /dev/mtdblock13        2097152    106372   1990780   5% /mnt
> / $ dd if=/dev/zero of=/mnt/file1 bs=1M count=100
> 100+0 records in
> 100+0 records out
> / $ ls -l /mnt
> -rw-r--r--    1 root     root    104857600 Jan  1 00:04 file
> -rw-r--r--    1 root     root    104857600 Jan  1 00:05 file1
> drw-rw-rw-    1 root     root         2048 Jan  1 00:00 lost+found
> / $ df
> Filesystem           1k-blocks      Used Available Use% Mounted on
> /dev/mtdblock5           32768     18184     14584  55% /
> tmpfs                    63956         0     63956   0% /var/tmp
> /dev/mtdblock13        2097152    208900   1888252  10% /mnt
> / $
> / $ rm /mnt/file1
>
> !!!!!!!! interrupted by power cycle
>
> //after reboot, mount: (still normal)
> / $ ls -l /mnt/
> -rw-r--r--    1 root     root    104857600 Jan  1 00:04 file
> drw-rw-rw-    1 root     root         2048 Jan  1 00:00 lost+found
> / $ df
> Filesystem           1k-blocks      Used Available Use% Mounted on
> /dev/mtdblock5           32768     18120     14648  55% /
> tmpfs                    63956         0     63956   0% /var/tmp
> /dev/mtdblock13        2097152    106372   1990780   5% /mnt
> / $
>
> // and the strange part:
>
> / $ dd if=/dev/zero of=/mnt/file1 bs=1M count=100
> ls -l /mnt
> df
> 100+0 records in
> 100+0 records out
> / $ ls -l /mnt
> -rw-r--r--    1 root     root    104857600 Jan  1 00:05 file
> -rw-r--r--    1 root     root    104857600 Jan  1 00:01 file1
> drw-rw-rw-    1 root     root         2048 Jan  1 00:00 lost+found
> / $ df
> Filesystem           1k-blocks      Used Available Use% Mounted on
> /dev/mtdblock5           32768     18124     14644  55% /
> tmpfs                    63956         0     63956   0% /var/tmp
> /dev/mtdblock13        2097152    742624   1354528  35% /mnt
> / $
>
> It can be seen that the number of used blocks is very high (without
> reason).
>
> / $ cat /proc/yaffs
> YAFFS built:May 19 2009 05:24:47
> $Id: yaffs_fs.c,v 1.79 2009/03/17 01:12:00 wookey Exp $
> $Id: yaffs_guts.c,v 1.82 2009/03/09 04:24:17 charles Exp $
>
> Device 0 "MAP"
> startBlock......... 0
> endBlock........... 16383
> totalBytesPerChunk. 2048
> nDataBytesPerChunk. 2048
> chunkGroupBits..... 0
> chunkGroupSize..... 1
> nErasedBlocks...... 14764
> nReservedBlocks.... 5
> blocksInCheckpoint. 0
> nTnodesCreated..... 7400
> nFreeTnodes........ 77
> nObjectsCreated.... 200
> nFreeObjects....... 93
> nFreeChunks........ 678095
> nPageWrites........ 0
> nPageReads......... 0
> nBlockErasures..... 695
> nGCCopies.......... 2
> garbageCollections. 4865
> passiveGCs......... 4865
> nRetriedWrites..... 0
> nShortOpCaches..... 10
> nRetireBlocks...... 0
> eccFixed........... 0
> eccUnfixed......... 0
> tagsEccFixed....... 0
> tagsEccUnfixed..... 0
> cacheHits.......... 0
> nDeletedFiles...... 1
> nUnlinkedFiles..... 1
> nBackgroudDeletions 0
> useNANDECC......... 1
> isYaffs2........... 1
> inbandTags......... 0
> / $
>
> Note: the same happens with any number of files (including 1)
>
>
> I have searched the net for similar cases but the ones I found are 4 years
> old and seemingly solved.
> Is the problem familiar to anyone here?
> What logs/traces should I make to find the lost blocks?
>
> Any help is appreciated,
> Viktor Babrian
>
>
>
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