[Yaffs] [Yaffs-archive] [Question]when making yaffs2..

Wed, 21 Apr 2004 16:50:03 +0900 (KST)

Dear all,
<br>

I am using the yaffs to implement yaffs2 supporting 16Bit,2K page 
 
Even if reading the yaffs2 spec, I can't fully understand it. 
 
And decided to expand yaffs1 with easeness for yaffs2. 
 
Currently, I re-defined 
 
yaffs_tags 
 
__u32 chunkid; 
 
__u32 objectid; 
 
__u32 serialnumber 
 
__u16 pad1; 
 
unsigned ecc:12; 
 
unsigned ecc2:12; 
 
unsinged pad:8; 
 
Total tags size is 20 bytes. 
 
Surely SPARCE size is 64 bytes. 
 
Yaffs_spare structure has 
 
26byte ecc value: 2 byte blockstatus, 2 byte page stuatus, 20 byte tags. 
 
I tried to make litte modificatoin to yaffs original source code and tested as like the followings: 
 
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 
 
1.MTD Driver -- read/write O.K tested by mtdchar, ext2 file system. 
 
2.yaffs2 
 
 A.read : directory, file reading is ok 
 
 B.write :, when creating new files ,kernel crashed..

<br>

<br>
Craching Point 
<br>
asmlinkage long sys_open --&gt; filp_open(tmp, flags, mode) 
<br>
--&gt; fd_install(fd, f); 
<br>

<br>
fd_install(unsigned int fd, struct file * file) 
<br>
{ 
<br>
struct files_struct *files = current-&gt;files; 
<br>
write_lock(&amp;files-&gt;file_lock); 
<br>
if (files-&gt;fd[fd]) BUG(); &lt;---- I have the Problems 
<br>
files-&gt;fd[fd] = file; 
<br>
write_unlock(&amp;files-&gt;file_lock); 
<br>
} 
<br>

linux-2.4.18-rmk7 
 
I don't think that linux-2.4.18-rmk7 has the problems of sys_open /fd_install. 
 
But yaffs1 works fine in linux-2.4.18-rmk7 and my yaffs2 uses exactly same code to connect between yaffs2 and VFS.(I guess..)

<br>
My test example is 
<br>
Shell&gt; cd yaffs2_dir 
<br>
Shell&gt; echo &quot;1&quot; &gt; some_file 
<br>
Sys_open-&gt; filp_open .... yaffs_lookup .. a yaffs_create ( until this, I have no problems) 
<br>
--&gt;fd_install (crash. Currents-&gt;files-&gt;fd[fd] has wrong value) 
<br>

<br>
Thanks in advance.
<br>

<br>
SW.LEE
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