/*
- * If the btrfs-progs is newer and kernel is at
- * generation_v1 then we don't touch v2 items
- * otherwise when kernel is at same or greater
- * version compared with btrfs-progs then update
- * the needed
- */
- old_size = btrfs_item_size_nr(l, slot);
- if (old_size >= sizeof(*item)) {
- btrfs_set_root_generation_v2(item,
- btrfs_root_generation(item));
+ * If this is the first time we update the root item which originated
+ * from an older kernel, we need to enlarge the item size to make room
+ * for the added fields.
+ */
+ if (old_len < sizeof(*item)) {
With this fix. when kernel is using v1 and btrfs-progs is
using v2, the disk structure will be changed to v2 after
running btrfs check. I would rather take a conservative
approach, by maintaining kernel intended version.
Thanks, Anand
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