[PATCH v6 09/11] erofs-utils: lib: add erofs_inode_is_whiteout() helper

[Jingbo Xu <jefflexu@linux.alibaba.com>]

Add erofs_inode_is_whiteout() helper checking if given inode is a
whiteout.

Signed-off-by: Jingbo Xu <jefflexu@linux.alibaba.com>
---
 include/erofs/internal.h | 7 +++++++
 lib/tar.c                | 2 --
 2 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/include/erofs/internal.h b/include/erofs/internal.h
index fcc0710..5df689c 100644
--- a/include/erofs/internal.h
+++ b/include/erofs/internal.h
@@ -20,6 +20,7 @@ typedef unsigned short umode_t;
 #include "erofs_fs.h"
 #include <fcntl.h>
 #include <sys/types.h> /* for off_t definition */
+#include <sys/stat.h> /* for S_ISCHR definition */
 #include <stdio.h>
 
 #ifndef PATH_MAX
@@ -427,6 +428,12 @@ static inline u32 erofs_crc32c(u32 crc, const u8 *in, size_t len)
 	return crc;
 }
 
+#define EROFS_WHITEOUT_DEV	0
+static inline bool erofs_inode_is_whiteout(struct erofs_inode *inode)
+{
+	return S_ISCHR(inode->i_mode) && inode->u.i_rdev == EROFS_WHITEOUT_DEV;
+}
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/lib/tar.c b/lib/tar.c
index e0fe2a2..8cb392c 100644
--- a/lib/tar.c
+++ b/lib/tar.c
@@ -13,8 +13,6 @@
 #include "erofs/blobchunk.h"
 #include "erofs/rebuild.h"
 
-#define EROFS_WHITEOUT_DEV	0
-
 static char erofs_libbuf[16384];
 
 struct tar_header {
-- 
2.19.1.6.gb485710b