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List:       yaffs
Subject:    Re: [Yaffs] *****SPAM***** how to avoid yaffs2 lose data afterpowerfail or shut down?
From:       Charles Manning <cdhmanning () gmail ! com>
Date:       2013-07-24 21:30:41
Message-ID: 201307250930.42018.manningc2 () actrix ! gen ! nz
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On Wednesday 24 July 2013 14:24:19 VGAIC畅通-邱工 wrote:
> Why my email is SPAM, how to fix it?
>
> ------------------ Original ------------------
> From:  "gongfen"<gongfen@vgaic.com>;
> Date:  Wed, Jul 24, 2013 10:09 AM
> To:  "yaffs"<yaffs@lists.aleph1.co.uk>;
>
> Subject:  [Yaffs] *****SPAM***** how to avoid yaffs2 lose data
> afterpowerfail or shut down?
>
>
> I use yaffs2 (git it Jul 11) with linux 2.6.32. But if I test many time
> about power fail shut down, and I found that some file is change(I use md5
> to check every file).
>
>
> My partions is :
> /dev/mtdblock4           44.0M      9.7M     34.3M  22% /mnt
>
>
> I test it to use watchdog reboot Random restart. (same as power fail or
> shut down).
>
>
> My yaffs2 log:
>
>
> cat /proc/yaffs
> Multi-version YAFFS built:Jul 18 2013 12:37:18
>
>
>
>
> Device 0 "filesystem2"
> start_block.......... 0
> end_block............ 351
> total_bytes_per_chunk 2048
> use_nand_ecc......... 1
> no_tags_ecc.......... 0
> is_yaffs2............ 1
> inband_tags.......... 0
> empty_lost_n_found... 1
> disable_lazy_load.... 0
> disable_bad_block_mrk 0
> refresh_period....... 500
> n_caches............. 10
> n_reserved_blocks.... 5
> always_check_erased.. 0
>
>
> block count by state
> 0:0 1:0 2:0 3:283 4:1
> 5:67 6:0 7:0 8:0 9:1
> max file size....... 549755811840
> data_bytes_per_chunk. 2048
> chunk_grp_bits....... 0
> chunk_grp_size....... 1
> n_erased_blocks...... 283
> blocks_in_checkpt.... 0
>
>
> n_tnodes............. 427
> n_obj................ 163
> n_free_chunks........ 18149
>
>
> n_page_writes........ 128
> n_page_reads......... 4400
> n_erasures........... 3
> n_gc_copies.......... 122
> all_gcs.............. 25
> passive_gc_count..... 25
> oldest_dirty_gc_count 1
> n_gc_blocks.......... 1
> bg_gcs............... 1
> n_retried_writes..... 0
> n_retired_blocks..... 0
> n_ecc_fixed.......... 0
> n_ecc_unfixed........ 0
> n_tags_ecc_fixed..... 0
> n_tags_ecc_unfixed... 0
> cache_hits........... 0
> n_deleted_files...... 0
> n_unlinked_files..... 1
> refresh_count........ 1
> n_bg_deletions....... 0
> tags_used............ 0
> summary_used......... 0
>
>
>
> My kernel config is:
> CONFIG_YAFFS_FS=y
> CONFIG_YAFFS_YAFFS1=y
> # CONFIG_YAFFS_9BYTE_TAGS is not set
> # CONFIG_YAFFS_DOES_ECC is not set
> CONFIG_YAFFS_YAFFS2=y
> CONFIG_YAFFS_AUTO_YAFFS2=y
> # CONFIG_YAFFS_DISABLE_TAGS_ECC is not set
> # CONFIG_YAFFS_ALWAYS_CHECK_CHUNK_ERASED is not set
> # CONFIG_YAFFS_EMPTY_LOST_AND_FOUND is not set
> # CONFIG_YAFFS_DISABLE_BLOCK_REFRESHING is not set
> # CONFIG_YAFFS_DISABLE_BACKGROUND is not set
> # CONFIG_YAFFS_DISABLE_BAD_BLOCK_MARKING is not set
> CONFIG_YAFFS_XATTR=y
>
>
> My embed board can't lose any data, so there is any method to avoid lose
> data ? Any config to help this under linux ? Now, I create some backup
> partion to restore it, But I don't want to do this that If I can find that
> why yaffs2 lose data?


Can you show more details on the actual test you do, including info on when 
you pull the power.

Do you get the same problem if you unmount frst?

-- Charrles


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