linux: Consolidate statfs implementations

The __NR_statfs64 syscall is supported on all architectures but
aarch64, mips64, riscv64, and x86_64.  And newer ABIs also uses
the new statfs64 interface (where the struct size is used as
second argument).

So the default implementation now uses:

  1. __NR_statfs64 for non-LFS call and handle overflow directly
     There is no need to handle __NR_statfs since all architectures
     that only support are LFS only.

  2. __NR_statfs if defined or __NR_statfs64 otherwise for LFS
     call.

Alpha is the only outlier, since it is a 64-bit architecture which
provides non-LFS interface and only provides __NR_statfs64 on
newer kernels (v5.1+).

Checked on x86_64-linux-gnu.

Reviewed-by: Carlos O'Donell <carlos@redhat.com>

1 files changed, 30 insertions, 0 deletions

diff --git a/sysdeps/unix/sysv/linux/alpha/statfs.c b/sysdeps/unix/sysv/linux/alpha/statfs.c
new file mode 100644
index 0000000..3378976
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/alpha/statfs.c
@@ -0,0 +1,30 @@
+/* Return information about the filesystem on which FILE resides.  Linux/alpha.
+   Copyright (C) 1996-2021 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+#include <sys/statfs.h>
+#include <sysdep.h>
+#include <kernel_stat.h>
+
+/* Return information about the filesystem on which FILE resides.  */
+int
+__statfs (const char *file, struct statfs *buf)
+{
+  return INLINE_SYSCALL_CALL (statfs, file, buf);
+}
+libc_hidden_def (__statfs)
+weak_alias (__statfs, statfs)