Hmm... disassembling the code, it's pretty clear the problem is here
in do_split(), around line 1208:
map = (struct dx_map_entry *) (data2 + blocksize);
count = dx_make_map ((struct ext3_dir_entry_2 *) data1,
blocksize, hinfo, map);
map -= count;
dx_sort_map (map, count);
/* Split the existing block in the middle, size-wise */
size = 0;
move = 0;
for (i = count-1; i >= 0; i--) {
/* is more than half of this entry in 2nd half of the block? */
if (size + map[i].size/2 > blocksize/2) <====
break;
size += map[i].size;
move++;
}
I suspect dx_make_map returned 0, and since i and count are an
unsigned int, things started to go downhill after i was assigned the
value of ((unsigned) -1).
How could this happen? The only way thing I can think of is a
directory block with a large number of deleted directory entries that
were not coalesced for some reason. That shouldn't happen normally,
but that's the only explanation I can think of why we might be trying
to split an directory block where dx_make_map() is returning 0.
Asheesh, are you willing to recompile a kernel with some debugging
code inserted?
- Ted
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