fix the definition of struct statvfs to match lsb abi

at the same time, make struct statfs match the traditional definition
and make it more useful, especially the fsid_t stuff.

arch/arm/bits/statfs.h

-struct statvfs {
-	unsigned long f_type;
-	unsigned long f_bsize;
-	fsblkcnt_t f_blocks;
-	fsblkcnt_t f_bfree;
-	fsblkcnt_t f_bavail;
-	fsfilcnt_t f_files;
-	fsfilcnt_t f_ffree;
-	unsigned long f_fsid;
-	unsigned long __unused;
-	unsigned long f_namemax;
-	unsigned long f_frsize;
-	fsfilcnt_t f_favail;
-	unsigned long f_flag;
-	unsigned long __reserved[2];
+struct statfs {
+	unsigned long f_type, f_bsize;
+	fsblkcnt_t f_blocks, f_bfree, f_bavail;
+	fsfilcnt_t f_files, f_ffree;
+	fsid_t f_fsid;
+	unsigned long f_namelen, f_frsize, f_flags, f_spare[4];
 };

arch/i386/bits/statfs.h

-struct statvfs {
-	unsigned long f_type;
-	unsigned long f_bsize;
-	fsblkcnt_t f_blocks;
-	fsblkcnt_t f_bfree;
-	fsblkcnt_t f_bavail;
-	fsfilcnt_t f_files;
-	fsfilcnt_t f_ffree;
-	unsigned long f_fsid;
-	unsigned long __unused;
-	unsigned long f_namemax;
-	unsigned long f_frsize;
-	fsfilcnt_t f_favail;
-	unsigned long f_flag;
-	unsigned long __reserved[2];
+struct statfs {
+	unsigned long f_type, f_bsize;
+	fsblkcnt_t f_blocks, f_bfree, f_bavail;
+	fsfilcnt_t f_files, f_ffree;
+	fsid_t f_fsid;
+	unsigned long f_namelen, f_frsize, f_flags, f_spare[4];
 };

arch/x86_64/bits/statfs.h

-struct statvfs {
-	unsigned long f_type;
-	unsigned long f_bsize;
-	fsblkcnt_t f_blocks;
-	fsblkcnt_t f_bfree;
-	fsblkcnt_t f_bavail;
-	fsfilcnt_t f_files;
-	fsfilcnt_t f_ffree;
-	unsigned long f_fsid;
-	unsigned long f_namemax;
-	unsigned long f_frsize;
-	fsfilcnt_t f_favail;
-	unsigned long f_flag;
-	unsigned long __reserved[3];
+struct statfs {
+	unsigned long f_type, f_bsize;
+	fsblkcnt_t f_blocks, f_bfree, f_bavail;
+	fsfilcnt_t f_files, f_ffree;
+	fsid_t f_fsid;
+	unsigned long f_namelen, f_frsize, f_flags, f_spare[4];
 };

include/sys/statfs.h

@@ -3,8 +3,13 @@
 
 #include <sys/statvfs.h>
 
-#define statfs statvfs
-#define fstatfs fstatvfs
-#define f_namelen f_namemax
+typedef struct {
+	int val[2];
+} fsid_t;
+
+#include <bits/statfs.h>
+
+int statfs (const char *, struct statfs *);
+int fstatfs (int, struct statfs *);
 
 #endif

include/sys/statvfs.h

@@ -6,15 +6,28 @@
 #define __NEED_fsfilcnt_t
 #include <bits/alltypes.h>
 
-#include <bits/statfs.h>
+#include <endian.h>
+
+struct statvfs {
+	unsigned long f_bsize, f_frsize;
+	fsblkcnt_t f_blocks, f_bfree, f_bavail;
+	fsfilcnt_t f_files, f_ffree, f_favail;
+#if __BYTE_ORDER == __LITTLE_ENDIAN
+	unsigned long f_fsid;
+	unsigned :8*(2*sizeof(int)-sizeof(long));
+#else
+	unsigned :8*(2*sizeof(int)-sizeof(long));
+	unsigned long f_fsid;
+#endif
+	unsigned long f_flag, f_namemax;
+	int __reserved[6];
+};
 
 int statvfs (const char *, struct statvfs *);
 int fstatvfs (int, struct statvfs *);
 
 #define ST_RDONLY 1
 #define ST_NOSUID 2
-
-#if 0
 #define ST_NODEV  4
 #define ST_NOEXEC 8
 #define ST_SYNCHRONOUS 16
@@ -24,7 +37,6 @@ int fstatvfs (int, struct statvfs *);
 #define ST_IMMUTABLE   512
 #define ST_NOATIME     1024
 #define ST_NODIRATIME  2048
-#endif
 
 
 #endif

src/stat/fstatvfs.c

-#include <sys/statvfs.h>
-#include "syscall.h"
-#include "libc.h"
-
-int fstatvfs(int fd, struct statvfs *buf)
-{
-#ifdef SYS_fstatfs64
-	return syscall(SYS_fstatfs64, fd, sizeof *buf, buf);
-#else
-	return syscall(SYS_fstatfs, fd, buf);
-#endif
-}
-
-weak_alias(fstatvfs, fstatfs);
-
-LFS64(fstatvfs);
-LFS64(fstatfs);

src/stat/statvfs.c

 #include <sys/statvfs.h>
+#include <sys/statfs.h>
 #include "syscall.h"
 #include "libc.h"
 
-int statvfs(const char *path, struct statvfs *buf)
+int __statfs(const char *path, struct statfs *buf)
 {
 #ifdef SYS_statfs64
 	return syscall(SYS_statfs64, path, sizeof *buf, buf);
@@ -11,7 +12,50 @@ int statvfs(const char *path, struct statvfs *buf)
 #endif
 }
 
-weak_alias(statvfs, statfs);
+int __fstatfs(int fd, struct statfs *buf)
+{
+#ifdef SYS_fstatfs64
+	return syscall(SYS_fstatfs64, fd, sizeof *buf, buf);
+#else
+	return syscall(SYS_fstatfs, fd, buf);
+#endif
+}
+
+weak_alias(__statfs, statfs);
+weak_alias(__fstatfs, fstatfs);
+
+static void fixup(struct statvfs *out, const struct statfs *in)
+{
+	out->f_bsize = in->f_bsize;
+	out->f_frsize = in->f_bsize;
+	out->f_blocks = in->f_blocks;
+	out->f_bfree = in->f_bfree;
+	out->f_bavail = in->f_bavail;
+	out->f_files = in->f_files;
+	out->f_ffree = in->f_ffree;
+	out->f_favail = 0;
+	out->f_fsid = in->f_fsid.val[0];
+	out->f_flag = in->f_flags;
+	out->f_namemax = in->f_namelen;
+}
+
+int statvfs(const char *path, struct statvfs *buf)
+{
+	struct statfs kbuf;
+	if (__statfs(path, &kbuf)<0) return -1;
+	fixup(buf, &kbuf);
+	return 0;
+}
+
+int fstatvfs(int fd, struct statvfs *buf)
+{
+	struct statfs kbuf;
+	if (__fstatfs(fd, &kbuf)<0) return -1;
+	fixup(buf, &kbuf);
+	return 0;
+}
 
 LFS64(statvfs);
 LFS64(statfs);
+LFS64(fstatvfs);
+LFS64(fstatfs);