[PATCH] ext3: turn on reservation dump on block allocation errors
In the past there were a few kernel panics related to block reservation
tree operations failure (insert/remove etc). It would be very useful to
get the block allocation reservation map info when such error happens.
Signed-off-by: Mingming Cao <cmm@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/fs/ext3/balloc.c b/fs/ext3/balloc.c
index e6b9837..2bd836f 100644
--- a/fs/ext3/balloc.c
+++ b/fs/ext3/balloc.c
@@ -111,7 +111,7 @@
* we could easily switch to that without changing too much
* code.
*/
-#if 0
+#if 1
static void __rsv_window_dump(struct rb_root *root, int verbose,
const char *fn)
{
@@ -129,7 +129,7 @@
rsv = list_entry(n, struct ext3_reserve_window_node, rsv_node);
if (verbose)
printk("reservation window 0x%p "
- "start: %d, end: %d\n",
+ "start: %lu, end: %lu\n",
rsv, rsv->rsv_start, rsv->rsv_end);
if (rsv->rsv_start && rsv->rsv_start >= rsv->rsv_end) {
printk("Bad reservation %p (start >= end)\n",
@@ -236,8 +236,10 @@
p = &(*p)->rb_left;
else if (start > this->rsv_end)
p = &(*p)->rb_right;
- else
+ else {
+ rsv_window_dump(root, 1);
BUG();
+ }
}
rb_link_node(node, parent, p);
@@ -1133,8 +1135,10 @@
*count-my_rsv->rsv_end + grp_goal - 1);
if ((my_rsv->rsv_start >= group_first_block + EXT3_BLOCKS_PER_GROUP(sb))
- || (my_rsv->rsv_end < group_first_block))
+ || (my_rsv->rsv_end < group_first_block)) {
+ rsv_window_dump(&EXT3_SB(sb)->s_rsv_window_root, 1);
BUG();
+ }
ret = ext3_try_to_allocate(sb, handle, group, bitmap_bh, grp_goal,
&num, &my_rsv->rsv_window);
if (ret >= 0) {