On Wed, Aug 01, 2012 at 09:48:15PM +0200, Olivier Bonvalet wrote:
> I have some trouble with a btrfs filesystem.
> As you can see in logs, there is lines which are from btrfs (I
> supposed), then some warnings at fs/btrfs/extent-tree.c, and finally a
> "kernel BUG" at fs/btrfs/extent-tree.c:5038.
Did you really see this BUG ? It comes from some unused and disabled code:
5036 #ifdef BTRFS_COMPAT_EXTENT_TREE_V0
5037 if (item_size < sizeof(*ei)) {
5038 BUG_ON(found_extent || extent_slot != path->slots[0]);
^^^^
5039 ret = convert_extent_item_v0(trans, extent_root, path,
5040 owner_objectid, 0);
5041 if (ret < 0)
5042 goto abort;
5043
5044 btrfs_release_path(path);
5045 path->leave_spinning = 1;
5046
5047 key.objectid = bytenr;
5048 key.type = BTRFS_EXTENT_ITEM_KEY;
5049 key.offset = num_bytes;
5050
5051 ret = btrfs_search_slot(trans, extent_root, &key, path,
5052 -1, 1);
5053 if (ret) {
5054 printk(KERN_ERR "umm, got %d back from search"
5055 ", was looking for %llu\n", ret,
5056 (unsigned long long)bytenr);
5057 btrfs_print_leaf(extent_root, path->nodes[0]);
5058 }
5059 if (ret < 0)
5060 goto abort;
5061 extent_slot = path->slots[0];
5062 leaf = path->nodes[0];
5063 item_size = btrfs_item_size_nr(leaf, extent_slot);
5064 }
5065 #endif
david
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