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Btrfs: fix oops while writing data to SSD partitions

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Here I have a two SSD-partitions btrfs, and they are defaultly set to
"data=raid0, metadata=raid1", then I try to fill my btrfs partition
till "No space left on device", via "dd if=/dev/zero of=/mnt/btrfs/tmp".

I get an oops panic from kernel BUG at fs/btrfs/extent-tree.c:5199!, which
refers to find_free_extent's
BUG_ON(index != get_block_group_index(block_group));

In SSD mode, in order to find enough space to alloc, we may check the
block_group cache which has been checked sometime before, but the index is not
updated, where it hits the BUG_ON.

Signed-off-by: Liu Bo <liubo2009@cn.fujitsu.com>
Acked-by: Josef Bacik <josef@redhat.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
liubo 2011-07-27 09:49:18 +00:00 committed by Chris Mason
parent 61cfea9bb8
commit ff1f2b4407
1 changed files with 3 additions and 1 deletions
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4
fs/btrfs/extent-tree.c
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@ -5079,7 +5079,9 @@ have_block_group:
* group is does point to and try again
*/
if (!last_ptr_loop && last_ptr->block_group &&
last_ptr->block_group != block_group) {
last_ptr->block_group != block_group &&
index <=
get_block_group_index(last_ptr->block_group)) {
btrfs_put_block_group(block_group);
block_group = last_ptr->block_group;