A query about the solution for NFS to mount jffs2 file system

[xin zheng]

Hello:

On my kernel (version 2.6.16.29), I can not mount a jffs2 filesystem by
NFS (NFS works well for other file systems). 

Here is my situation. I have a NFS server running with IP address
172.16.35.20, it has the /etc/exports with the following entry:

/flash 172.16.35.1/32(rw,async,no_subtree_check,no_root_squash)

/flash is a jffs2 filesystem

And I have NFS client with IP address 172.16.35.1. When I try to mount
/flash, I get an error looks like:

mount -t nfs 172.16.35.20:/flash /mnt
mount: 172.16.35.20:/flash failed, reason given by server: Permission
denied

I saw some discussions about this kind of problem on the following
link:

http://www.infradead.org/pipermail/linux-mtd/2006-September/016496.html

Then I did the fixes given there:
Made the two Change inlinux-2.6.29/fs/jffs2/super.c ,
 	struct jffs2_sb_info *p = data;
@@ -150,6 +154,7 @@
 	spin_lock_init(&c->inocache_lock);

 	sb->s_op = &jffs2_super_operations;
+	sb->s_export_op = &jffs2_export_ops;
 	sb->s_flags = flags | MS_NOATIME;

AND

ret = jffs2_do_fill_super(sb, data, (flags&MS_VERBOSE)?1:0);
@@ -314,6 +319,7 @@
 	.name =		"jffs2",
 	.get_sb =	jffs2_get_sb,
 	.kill_sb =	jffs2_kill_sb,
+	.fs_flags = FS_REQUIRES_DEV,
 };

ALSO, I changed the /etc/exports file entry to:
/flash
172.16.35.1/32(rw,async,no_subtree_check,no_root_squash,fsid=32505856)

THEN, I try mounting again by executing:
mount -t nfs 172.16.35.20:/flash /mnt

It DO mount correctly. BUT, when I try to access the mounted
directory:
> ls /mnt

It is just dead, no output, can not be killed.

I am wondering are there anything wrong in my previous operations. OR
are there any solutions, patches can fix this problem so that the jffs2
file system can be mounted and accessed correctly ON NFS.

Cheers,
Shane




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