[PATCH 2/2] sysdeps/statfs: Handle 64-bit ino_t types on 32-bit hosts

[Alistair Francis <alistair.francis@wdc.com>]

On a 32-bit platform with a 64-bit ino_t type (__INO_T_MATCHES_INO64_T
defined) we want to update the statfs struct to remove the padding as it
isn't required. As we don't have the padding we also need to update the
overflow checker to not access the undefined members.

2019-09-16  Alistair Francis  <alistair.francis@wdc.com>

	* sysdeps/unix/sysv/linux/generic/bits/statfs.h: Handle 64-bit ino_t
	types on 32-bit hosts.
	* sysdeps/unix/sysv/linux/generic/wordsize-32/overflow.h: Likewise.
---
 sysdeps/unix/sysv/linux/generic/bits/statfs.h          | 5 ++++-
 sysdeps/unix/sysv/linux/generic/wordsize-32/overflow.h | 4 ++++
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/sysdeps/unix/sysv/linux/generic/bits/statfs.h b/sysdeps/unix/sysv/linux/generic/bits/statfs.h
index 3472084ade0..eab1439acff 100644
--- a/sysdeps/unix/sysv/linux/generic/bits/statfs.h
+++ b/sysdeps/unix/sysv/linux/generic/bits/statfs.h
@@ -32,7 +32,10 @@
    using __USE_FILE_OFFSET64 only see the low 32 bits of some
    of the fields (the __fsblkcnt_t and __fsfilcnt_t fields).  */
 
-#if defined __USE_FILE_OFFSET64
+#if defined(__USE_FILE_OFFSET64) || __INO_T_MATCHES_INO64_T == 1
+# if __INO_T_MATCHES_INO64_T == 1 && __OFF_T_MATCHES_OFF64_T != 1
+#  error "ino_t and off_t must both be the same type"
+# endif
 # define __field64(type, type64, name) type64 name
 #elif __WORDSIZE == 64
 # define __field64(type, type64, name) type name
diff --git a/sysdeps/unix/sysv/linux/generic/wordsize-32/overflow.h b/sysdeps/unix/sysv/linux/generic/wordsize-32/overflow.h
index 3c21da501b2..df35c69c09f 100644
--- a/sysdeps/unix/sysv/linux/generic/wordsize-32/overflow.h
+++ b/sysdeps/unix/sysv/linux/generic/wordsize-32/overflow.h
@@ -51,6 +51,9 @@ static inline int stat_overflow (struct stat *buf)
 /* Note that f_files and f_ffree may validly be a sign-extended -1.  */
 static inline int statfs_overflow (struct statfs *buf)
 {
+#if defined (__INO_T_MATCHES_INO64_T)
+  return 0;
+#else
   if (buf->__f_blocks_pad == 0 && buf->__f_bfree_pad == 0
       && buf->__f_bavail_pad == 0
       && (buf->__f_files_pad == 0
@@ -61,4 +64,5 @@ static inline int statfs_overflow (struct statfs *buf)
 
   __set_errno (EOVERFLOW);
   return -1;
+#endif
 }
-- 
2.23.0