ReiserFS buglet

[Jakob Oestergaard]

First:

In linux-2.4.19, I found the following:

fs/reiserfs/super.c:707

 s->s_blocksize = sb_blocksize(rs);
 s->s_blocksize_bits = 0;
 while ((1 << s->s_blocksize_bits) != s->s_blocksize)
     s->s_blocksize_bits ++;

What happens if there's a bit-flip on the disk so that s->s_blocksize is
not a power of two ?

I would suggest replacing the '!=' with a '<' in the while loop and
adding a sanity check afterwards.

After all, a single bit-flip in the root fs superblock would cause the
system to hang silently (but spinning really fast!) at boot.

Second:

As I see it, the ReiserFS journal has the same problems as jbd wrt. to
atomicity of write operations of indexes.  Please see my recent mail
about the jbd problems.

-- 
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