On Thu, Jun 23, 2011 at 11:01:01PM +0800, Daniel J Blueman wrote:
> On 23 June 2011 18:31, David Sterba <dave@xxxxxxxx> wrote:
> (how does one follow up an email in git send-email with the message id?)
git-send-email --in-reply-to=<identifier>
(if it does not ask for it) and paste identifier from mail header
In-Reply-To:
> If lookup_extent_backref fails, path->nodes[0] reasonably could be
> null along with other callers of btrfs_print_leaf, so ensure we have a
> valid extent buffer before dereferencing.
ack.
thanks,
david
>
> Signed-off-by: Daniel J Blueman <daniel.blueman@xxxxxxxxx>
>
> diff --git a/fs/btrfs/print-tree.c b/fs/btrfs/print-tree.c
> index fb2605d..f38e452 100644
> --- a/fs/btrfs/print-tree.c
> +++ b/fs/btrfs/print-tree.c
> @@ -158,8 +158,7 @@ static void print_extent_ref_v0(struct
> extent_buffer *eb, int slot)
> void btrfs_print_leaf(struct btrfs_root *root, struct extent_buffer *l)
> {
> int i;
> - u32 type;
> - u32 nr = btrfs_header_nritems(l);
> + u32 type, nr;
> struct btrfs_item *item;
> struct btrfs_root_item *ri;
> struct btrfs_dir_item *di;
> @@ -172,6 +171,11 @@ void btrfs_print_leaf(struct btrfs_root *root,
> struct extent_buffer *l)
> struct btrfs_key key;
> struct btrfs_key found_key;
>
> + if (!l)
> + return;
> +
> + nr = btrfs_header_nritems(l);
> +
> printk(KERN_INFO "leaf %llu total ptrs %d free space %d\n",
> (unsigned long long)btrfs_header_bytenr(l), nr,
> btrfs_leaf_free_space(root, l));
> --
> Daniel J Blueman
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