decouple struct stat from kernel type

presently, all archs/ABIs have struct stat matching the kernel
stat[64] type, except mips/mipsn32/mips64 which do conversion hacks in
syscall_arch.h to work around bugs in the kernel type. this patch
completely decouples them and adds a translation step to the success
path of fstatat. at present, this is just a gratuitous copying, but it
opens up multiple possibilities for future support for 64-bit time_t
on 32-bit archs and for cleaned-up/unified ABIs.

for clarity, the mips hacks are not yet removed in this commit, so the
mips kstat structs still correspond to the output of the hacks in
their syscall_arch.h files, not the raw kernel type. a subsequent
commit will fix this.

1 files changed, 19 insertions, 0 deletions

diff --git a/arch/s390x/kstat.h b/arch/s390x/kstat.h
new file mode 100644
index 00000000..001c10be
--- /dev/null
+++ b/arch/s390x/kstat.h
@@ -0,0 +1,19 @@
+struct kstat {
+	dev_t st_dev;
+	ino_t st_ino;
+	nlink_t st_nlink;
+	mode_t st_mode;
+	uid_t st_uid;
+	gid_t st_gid;
+	dev_t st_rdev;
+	off_t st_size;
+	long st_atime_sec;
+	long st_atime_nsec;
+	long st_mtime_sec;
+	long st_mtime_nsec;
+	long st_ctime_sec;
+	long st_ctime_nsec;
+	blksize_t st_blksize;
+	blkcnt_t st_blocks;
+	unsigned long __unused[3];
+};