[EROFS] Add support for xattr reservation of the base layser rootdir

Set the minimum inline xattr size for the root directory of the base
layer, as there may not be enough room for xattr during the incremental
build process.

Signed-off-by: Hongzhen Luo <hongzhen@linux.alibaba.com>

src/overlaybd/tar/erofs/CMakeLists.txt

@@ -3,7 +3,7 @@ include(FetchContent)
 FetchContent_Declare(
     erofs-utils
     GIT_REPOSITORY git://git.kernel.org/pub/scm/linux/kernel/git/xiang/erofs-utils.git
-    GIT_TAG        617d708925b3c5d1dd132853e47d9d9f51443e6f
+    GIT_TAG        599036f802d65841500f69a1d383381765e94c5c
 )
 
 FetchContent_MakeAvailable(erofs-utils)

src/overlaybd/tar/erofs/liberofs.cpp

@@ -17,6 +17,7 @@
 #define round_down_blk(addr) ((addr) & (~(SECTOR_SIZE - 1)))
 #define round_up_blk(addr) (round_down_blk((addr) + SECTOR_SIZE - 1))
 #define min(a, b) (a) < (b) ? (a) : (b)
+#define EROFS_ROOT_ATTR_SIZE (16 * 1024)
 
 #define EROFS_UNIMPLEMENTED 1
 
@@ -641,6 +642,10 @@ int LibErofs::extract_tar(photon::fs::IFile *source, bool meta_only, bool first_
     cfg.incremental = !first_layer;
     erofs_cfg = erofs_get_configure();
     erofs_cfg->c_ovlfs_strip = true;
+    if (first_layer)
+        erofs_cfg->c_root_xattr_isize = EROFS_ROOT_ATTR_SIZE;
+    else
+        erofs_cfg->c_root_xattr_isize = 0;
     cfg.mp_fp = std::tmpfile();
 
     err = erofs_mkfs(&cfg);