btrfs: constify structs with op functions or static definitions
There are some op tables that can be easily made const, similarly the
sysfs feature and raid tables. This is motivated by PaX CONSTIFY plugin.
Signed-off-by: David Sterba <dsterba@suse.cz>
diff --git a/fs/btrfs/compression.h b/fs/btrfs/compression.h
index d181f70..13a4dc0 100644
--- a/fs/btrfs/compression.h
+++ b/fs/btrfs/compression.h
@@ -77,7 +77,7 @@
size_t srclen, size_t destlen);
};
-extern struct btrfs_compress_op btrfs_zlib_compress;
-extern struct btrfs_compress_op btrfs_lzo_compress;
+extern const struct btrfs_compress_op btrfs_zlib_compress;
+extern const struct btrfs_compress_op btrfs_lzo_compress;
#endif