Yaffs goes bad when Flash is completelly full. When the space occupied by the yaffs file system is full, an error occurs.

If the file system of yaffs2 keeps writing files when the file space is full, the file system may be disordered and the file name may be garbled after a while,Logs may appear


Yaffs tragedy: No more eraased Blocks
!!!!!!!!! Allocator out
!!!!!!!!!!!!!!!!!.Charles Manning has fixed this issue in



Http://www.aleph1.co.uk/cgi-bin/viewcvs.cgi/yaffs2/yaffs_guts.c? R1 = 1.85 & r2 = 1.86
. The following is the information about the mail list.

 

From:Sharanu
Turamari
Sharanu.turamari@ziilabs.com
>

Date:
2009/7/21
To: yaffs@lists.aleph1.co.uk

Hi,
I
Am facing the problem with latest yaffs2 port when the whole flash Space
Is
Occupied.

I am following the below procedure:

-Copy the entire
Root contents to flash using "find bin boot Dev etc home
Init lib media sbin
Tmp usr var | cpio-pdum/flash "command
-Recursively copy the contents
Flash to different directories in Flash
Using "CP-RF * sd0" etc until
Flash usage gets 100% and"
Dev-> nerasedblocks "is 0.
-After
Sometimes I am getting "Allocator out" problems.
-Here onwards flash is
Completelly unusable since even deletion fails and
Only formatting will
Help.

Thoughts that come to mind is:
-Though nreservedblocks is 5,
Why yaffs is using all the blocks and
Getting Dev-> nerasedblocks
0.

-I am seeing yaffs_garbagecollectblock () is using one more fresh
Erased
Block in the routine yaffs_writenewchunkwithtagstonand () It callwhen
It
Is either a data chunk in live file or an object header.
So, instead
Of producing blocks it is consuming a block which explains
That whenever that
Condition occurs a block is being lost.

-Though the nreservedblocks is 5
, I am not seeing any restrictions on
The block allocation if it reaches
Below 5.

-Just for experimentation, I hacked to use reserved Blocks
Only
Yaffs_garbagecollectblock ()-> yaffs_writenewchunkwithtagstonand (),
And
Other allocations not use it. Thought There It Is stopping
When
Dev-> nerasedblocks is 8 and no "Allocator out" problems, still flash
Is
Unusable as not able to delete any file and increase free space usage.

-
I am not seeing any erase problem since each yaffs_garbagecollectblock ()
Is
Producing one erased block which is consumed immediately.

-If anybody
Has done the same experimentaion with yaffs, please help me
Solve
This.

RGDS,
Sharanu

_______________________________________________
Yaffs
Mailing List
Yaffs@lists.aleph1.co.uk

Http://lists.aleph1.co.uk/cgi-bin/mailman/listinfo/yaffs

----------
From:Charles Manning

Manningc2@actrix.gen.nz
>

Date:
2009/7/22
To: yaffs@lists.aleph1.co.uk





I
Have been able to recreate this problem and am looking at it now.

Thanks
To sharanu for his persistence in pointing this out.

-- Charles

----------
From:Charles Manning
Manningc2@actrix.gen.nz
>

Date:
2009/7/28
To: yaffs@lists.aleph1.co.uk





Please
Try the latest CVs.

Http://www.aleph1.co.uk/cgi-bin/viewcvs.cgi/yaffs2/yaffs_guts.c? R1 = 1.85 & r2 = 1.86


-- Charles

----------
From:Sharanu turamari
Sharanu.turamari@ziilabs.com
>

Date:
2009/7/28
To: Charles Manning <manningc2@actrix.gen.nz
>
HTTP: yaffs@lists.aleph1.co.uk

Hi
Charles,
Applied the fix and everything is fine now.
Thanks for the quick
And apt fix.

RGDS,
Sharanu