From: Qu Wenruo wqu@suse.com
commit 1465af12e254a68706e110846f59cf0f09683184 upstream.
Commit 259ee7754b67 ("btrfs: tree-checker: Add ROOT_ITEM check") introduced btrfs root item size check, however btrfs root item has two versions, the legacy one which just ends before generation_v2 member, is smaller than current btrfs root item size.
This caused btrfs kernel to reject valid but old tree root leaves.
Fix this problem by also allowing legacy root item, since kernel can already handle them pretty well and upgrade to newer root item format when needed.
Reported-by: Martin Steigerwald martin@lichtvoll.de Fixes: 259ee7754b67 ("btrfs: tree-checker: Add ROOT_ITEM check") CC: stable@vger.kernel.org # 5.4+ Tested-By: Martin Steigerwald martin@lichtvoll.de Reviewed-by: Josef Bacik josef@toxicpanda.com Signed-off-by: Qu Wenruo wqu@suse.com Reviewed-by: David Sterba dsterba@suse.com Signed-off-by: David Sterba dsterba@suse.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- fs/btrfs/tree-checker.c | 17 ++++++++++++----- include/uapi/linux/btrfs_tree.h | 14 ++++++++++++++ 2 files changed, 26 insertions(+), 5 deletions(-)
--- a/fs/btrfs/tree-checker.c +++ b/fs/btrfs/tree-checker.c @@ -1035,7 +1035,7 @@ static int check_root_item(struct extent int slot) { struct btrfs_fs_info *fs_info = leaf->fs_info; - struct btrfs_root_item ri; + struct btrfs_root_item ri = { 0 }; const u64 valid_root_flags = BTRFS_ROOT_SUBVOL_RDONLY | BTRFS_ROOT_SUBVOL_DEAD; int ret; @@ -1044,14 +1044,21 @@ static int check_root_item(struct extent if (ret < 0) return ret;
- if (btrfs_item_size_nr(leaf, slot) != sizeof(ri)) { + if (btrfs_item_size_nr(leaf, slot) != sizeof(ri) && + btrfs_item_size_nr(leaf, slot) != btrfs_legacy_root_item_size()) { generic_err(leaf, slot, - "invalid root item size, have %u expect %zu", - btrfs_item_size_nr(leaf, slot), sizeof(ri)); + "invalid root item size, have %u expect %zu or %u", + btrfs_item_size_nr(leaf, slot), sizeof(ri), + btrfs_legacy_root_item_size()); }
+ /* + * For legacy root item, the members starting at generation_v2 will be + * all filled with 0. + * And since we allow geneartion_v2 as 0, it will still pass the check. + */ read_extent_buffer(leaf, &ri, btrfs_item_ptr_offset(leaf, slot), - sizeof(ri)); + btrfs_item_size_nr(leaf, slot));
/* Generation related */ if (btrfs_root_generation(&ri) > --- a/include/uapi/linux/btrfs_tree.h +++ b/include/uapi/linux/btrfs_tree.h @@ -4,6 +4,11 @@
#include <linux/btrfs.h> #include <linux/types.h> +#ifdef __KERNEL__ +#include <linux/stddef.h> +#else +#include <stddef.h> +#endif
/* * This header contains the structure definitions and constants used @@ -645,6 +650,15 @@ struct btrfs_root_item { } __attribute__ ((__packed__));
/* + * Btrfs root item used to be smaller than current size. The old format ends + * at where member generation_v2 is. + */ +static inline __u32 btrfs_legacy_root_item_size(void) +{ + return offsetof(struct btrfs_root_item, generation_v2); +} + +/* * this is used for both forward and backward root refs */ struct btrfs_root_ref {