On Fri, Mar 10, 2023 at 01:04:52PM -0800, Jaegeuk Kim wrote:
> Let's reduce the complexity of mixed use of rb_tree in victim_entry from
> extent_cache and discard_cmd.
>
> This should fix arm32 memory alignment issue caused by shared rb_entry.
>
> [struct victim_entry] [struct rb_entry]
> [0] struct rb_node rb_node; [0] struct rb_node rb_node;
> union {
> struct {
> unsigned int ofs;
> unsigned int len;
> };
> [16] unsigned long long mtime; [12] unsigned long long key;
> } __packed;
>
> Cc: <[email protected]>
> Fixes: 093749e296e2 ("f2fs: support age threshold based garbage collection")
> Signed-off-by: Jaegeuk Kim <[email protected]>
Thanks for fixing this properly. It looks much better than the weird type
punning that was being done before...
> +static struct rb_node **f2fs_lookup_rb_tree_ext(struct f2fs_sb_info *sbi,
> + struct rb_root_cached *root,
> + struct rb_node **parent,
> + unsigned long long mtime, bool *leftmost)
Call this f2fs_lookup_victim_entry()?
> +static bool f2fs_check_victim_tree(struct f2fs_sb_info *sbi,
> + struct rb_root_cached *root)
> +{
> +#ifdef CONFIG_F2FS_CHECK_FS
> + struct rb_node *cur = rb_first_cached(root), *next;
> + struct victim_entry *cur_ve, *next_ve;
> +
> + if (!cur)
> + return true;
> +
> + while (cur) {
The !cur check is redundant.
- Eric
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