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btrfs: tree-checker: fix false alert caused by legacy btrfs root item

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commit 1465af12e254a68706e110846f59cf0f09683184 upstream.

Commit 259ee7754b ("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: 259ee7754b ("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>
This commit is contained in:
Qu Wenruo 2020-09-22 10:37:01 +08:00 • committed by Greg Kroah-Hartman
commit d3ce2d0fb8
2 changed files with 26 additions and 5 deletions
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14
include/uapi/linux/btrfs_tree.h
View file

@ -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
@ -650,6 +655,15 @@ struct btrfs_root_item {
__le64 reserved[8]; /* for future */
} __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
*/