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[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>
This commit is contained in:
Mingming Cao 2006-09-27 01:49:32 -07:00 committed by Linus Torvalds
parent 37ed322290
commit 321fb9e818
1 changed files with 8 additions and 4 deletions
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12
fs/ext3/balloc.c
View File

@ -111,7 +111,7 @@ error_out:
* 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 @@ restart:
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 @@ void ext3_rsv_window_add(struct super_block *sb,
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 @@ ext3_try_to_allocate_with_rsv(struct super_block *sb, handle_t *handle,
*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) {