RE: ubifs: read bad node type in ubifs_tnc_read_wbuf

[李傲傲 (Carson Li1/9542) <Carson.Li1@xxxxxxxxxx>]

Hi Richard:
>---------------------zbranch passed to ubifs_tnc_read_node----------------
>crash_arm> ubifs_zbranch c68cfd48
>struct ubifs_zbranch {
>  key = {
>    u8 = "\203\003\000\000\000\000\000",
>    u32 = {899, 0},
>    u64 = {899},
>    j32 = {899, 0}
>  },
>  {
>    znode = 0x0,
>    leaf = 0x0
>  },
>  lnum = 54, //DATAHD
>  offs = 210744,
>  len = 160
>}
>----------------------------zbranch found in TNC--------------------------
>crash_arm> ubifs_zbranch  0xc8ef9230 struct ubifs_zbranch {
>  key = {
>    u8 = "\203\003\000\000\000\000\000",
>    u32 = {899, 0},
>    u64 = {899},
>    j32 = {899, 0}
>  },
>  {
>    znode = 0x0,
>    leaf = 0x0
>  },
>  lnum = 224, //GCHD
>  offs = 226240,
>  len = 160
>}

>crash_arm> ubifs_jhead.wbuf.lnum 0xc901b000
> wbuf.lnum = 224, //GCHD
>crash_arm> ubifs_jhead.wbuf.lnum 0xc901b0a0
>  wbuf.lnum = 53,//BASEHD
>crash_arm> ubifs_jhead.wbuf.lnum 0xc901b140
>  wbuf.lnum = 54, //DATAHD

I am not sure if i have made it clear, maybe following logic can make it clearer:

A  |          B
--------------------------------------------------------------------------------------------
ubifs_tnc_locate
   zbr->lnum = 54 (find in TNC)
     ubifs_get_wbuf(zbr->lnum = 54) is ture
          ubifs_tnc_read_node
                         ->GC(change zt->lnum to 224(GCHD) in _TNC_)
                         ->zbr->lnum = 54 becomes DATAHD
ubifs_get_wbuf(zbr->lnum = 54 as the DATAHD) is ture again
     ubifs_read_node_wbuf
-------------------------------------------------------------------------------------------
Data lays in LEB54 have been moved to LEB224, so error happens. if a journal head is
garbage collected, if that means there is a commit has finished? I guess this situation
happens when making reservation, runs commit first and then does garbage collect.

Thanks.
Carson.
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