[1/2] sysdeps/stat: Handle 64-bit ino_t types on 32-bit hosts
Commit Message
On a 32-bit platform with a 64-bit ino_t type (__INO_T_MATCHES_INO64_T
defined) we want to update the stat 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/stat.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/stat.h | 5 ++++-
sysdeps/unix/sysv/linux/generic/wordsize-32/overflow.h | 4 ++++
2 files changed, 8 insertions(+), 1 deletion(-)
Comments
On Sep 16 2019, Alistair Francis <alistair.francis@wdc.com> wrote:
> @@ -40,7 +40,10 @@
> /* Versions of the `xmknod' interface. */
> #define _MKNOD_VER_LINUX 0
>
> -#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
Why are you using ==/!= 1 instead of !=/== 0?
> +# 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 45efcd8fd34..3c21da501b2 100644
> --- a/sysdeps/unix/sysv/linux/generic/wordsize-32/overflow.h
> +++ b/sysdeps/unix/sysv/linux/generic/wordsize-32/overflow.h
> @@ -36,12 +36,16 @@ static inline off_t lseek_overflow (loff_t res)
>
> static inline int stat_overflow (struct stat *buf)
> {
> +#if defined (__INO_T_MATCHES_INO64_T)
Shouldn't that be #if __INO_T_MATCHES_INO64_T?
Andreas.
On Tue, Sep 17, 2019 at 12:58 AM Andreas Schwab <schwab@suse.de> wrote:
>
> On Sep 16 2019, Alistair Francis <alistair.francis@wdc.com> wrote:
>
> > @@ -40,7 +40,10 @@
> > /* Versions of the `xmknod' interface. */
> > #define _MKNOD_VER_LINUX 0
> >
> > -#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
>
> Why are you using ==/!= 1 instead of !=/== 0?
No reason really, it results in the same outcome and I just did it this way.
>
> > +# 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 45efcd8fd34..3c21da501b2 100644
> > --- a/sysdeps/unix/sysv/linux/generic/wordsize-32/overflow.h
> > +++ b/sysdeps/unix/sysv/linux/generic/wordsize-32/overflow.h
> > @@ -36,12 +36,16 @@ static inline off_t lseek_overflow (loff_t res)
> >
> > static inline int stat_overflow (struct stat *buf)
> > {
> > +#if defined (__INO_T_MATCHES_INO64_T)
>
> Shouldn't that be #if __INO_T_MATCHES_INO64_T?
Yes, I'll fix that.
Alistair
>
> Andreas.
>
> --
> Andreas Schwab, SUSE Labs, schwab@suse.de
> GPG Key fingerprint = 0196 BAD8 1CE9 1970 F4BE 1748 E4D4 88E3 0EEA B9D7
> "And now for something completely different."
@@ -40,7 +40,10 @@
/* Versions of the `xmknod' interface. */
#define _MKNOD_VER_LINUX 0
-#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
@@ -36,12 +36,16 @@ static inline off_t lseek_overflow (loff_t res)
static inline int stat_overflow (struct stat *buf)
{
+#if defined (__INO_T_MATCHES_INO64_T)
+ return 0;
+#else
if (buf->__st_ino_pad == 0 && buf->__st_size_pad == 0
&& buf->__st_blocks_pad == 0)
return 0;
__set_errno (EOVERFLOW);
return -1;
+#endif
}
/* Note that f_files and f_ffree may validly be a sign-extended -1. */