2013/3/18, Jaegeuk Kim <jaegeuk.kim@xxxxxxxxxxx>:
> The build_free_nid should not add free nids over nm_i->max_nid.
> But, there was a hole that invalid free nid was added by the following
> scenario.
>
> Let's suppose nm_i->max_nid = 150 and the last NAT page has 100 ~ 200 nids.
>
> build_free_nids
> - get_current_nat_page loads the last NAT page
> - scan_nat_page can add 100 ~ 200 nids
> -> Bug here!
> So, when scanning an NAT page, we should check each candidate whether it is
> over max_nid or not.
>
> Signed-off-by: Jaegeuk Kim <jaegeuk.kim@xxxxxxxxxxx>
> ---
> fs/f2fs/node.c | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c
> index c60919f..3fb6dfe 100644
> --- a/fs/f2fs/node.c
> +++ b/fs/f2fs/node.c
> @@ -1270,6 +1270,8 @@ static int scan_nat_page(struct f2fs_nm_info *nm_i,
> i = start_nid % NAT_ENTRY_PER_BLOCK;
>
> for (; i < NAT_ENTRY_PER_BLOCK; i++, start_nid++) {
> + if (start_nid >= nm_i->max_nid)
> + return fcnt;
Hi Jaegeuk.
How about use "break;" instread of "return fcnt" ?
I think that break is better because there is no extra condition before return.
Thanks.
> blk_addr = le32_to_cpu(nat_blk->entries[i].block_addr);
> BUG_ON(blk_addr == NEW_ADDR);
> if (blk_addr == NULL_ADDR)
> --
> 1.8.1.3.566.gaa39828
>
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