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authorLiu Bo <bo.li.liu@oracle.com>2017-08-19 00:15:18 +0300
committerDavid Sterba <dsterba@suse.com>2017-08-21 18:47:42 +0300
commit167ce953ca55bdee20fe56c3c0fa51002435f745 (patch)
treeb85800ec47dd67e42d969c6c53a0257bae58c8a1 /fs/btrfs/ctree.h
parentaf1cbe0a66cb9e6c3f2acf7f0a7fc647b5dc4f2f (diff)
downloadlinux-167ce953ca55bdee20fe56c3c0fa51002435f745.tar.xz
Btrfs: add a helper to retrive extent inline ref type
An invalid value of extent inline ref type may be read from a malicious image which may force btrfs to crash. This adds a helper which does sanity check for the ref type, so we can know if it's sane, return he type, otherwise return an error. Signed-off-by: Liu Bo <bo.li.liu@oracle.com> Reviewed-by: David Sterba <dsterba@suse.com> [ minimal tweak const types, causing warnings due to other cleanup patches ] Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'fs/btrfs/ctree.h')
-rw-r--r--fs/btrfs/ctree.h11
1 files changed, 11 insertions, 0 deletions
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index ca087ad5ac48..542db9d0dbcd 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -2567,6 +2567,17 @@ static inline gfp_t btrfs_alloc_write_mask(struct address_space *mapping)
/* extent-tree.c */
+enum btrfs_inline_ref_type {
+ BTRFS_REF_TYPE_INVALID = 0,
+ BTRFS_REF_TYPE_BLOCK = 1,
+ BTRFS_REF_TYPE_DATA = 2,
+ BTRFS_REF_TYPE_ANY = 3,
+};
+
+int btrfs_get_extent_inline_ref_type(const struct extent_buffer *eb,
+ struct btrfs_extent_inline_ref *iref,
+ enum btrfs_inline_ref_type is_data);
+
u64 btrfs_csum_bytes_to_leaves(struct btrfs_fs_info *fs_info, u64 csum_bytes);
static inline u64 btrfs_calc_trans_metadata_size(struct btrfs_fs_info *fs_info,