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linux-user: Implement copy_file_range 

Signed-off-by: Andreas Schwab <schwab@suse.de>
Reviewed-by: Laurent Vivier <laurent@vivier.eu>
Message-Id: <mvm361eer3n.fsf@suse.de>
[lv: copy back offset only if there is no error]
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
This commit is contained in:
Andreas Schwab 2020-11-12 12:45:16 +01:00 committed by Laurent Vivier
parent c8a03a8f95
commit 8494645797
1 changed files with 42 additions and 0 deletions
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42
linux-user/syscall.c
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@ -813,6 +813,12 @@ safe_syscall5(int, mq_timedsend, int, mqdes, const char *, msg_ptr,
safe_syscall5(int, mq_timedreceive, int, mqdes, char *, msg_ptr,
size_t, len, unsigned *, prio, const struct timespec *, timeout)
#endif
#if defined(TARGET_NR_copy_file_range) && defined(__NR_copy_file_range)
safe_syscall6(ssize_t, copy_file_range, int, infd, loff_t *, pinoff,
int, outfd, loff_t *, poutoff, size_t, length,
unsigned int, flags)
#endif
/* We do ioctl like this rather than via safe_syscall3 to preserve the
* "third argument might be integer or pointer or not present" behaviour of
* the libc function.
@ -13065,6 +13071,42 @@ static abi_long do_syscall1(void *cpu_env, int num, abi_long arg1,
return get_errno(membarrier(arg1, arg2));
#endif
#if defined(TARGET_NR_copy_file_range) && defined(__NR_copy_file_range)
case TARGET_NR_copy_file_range:
{
loff_t inoff, outoff;
loff_t *pinoff = NULL, *poutoff = NULL;
if (arg2) {
if (get_user_u64(inoff, arg2)) {
return -TARGET_EFAULT;
}
pinoff = &inoff;
}
if (arg4) {
if (get_user_u64(outoff, arg4)) {
return -TARGET_EFAULT;
}
poutoff = &outoff;
}
ret = get_errno(safe_copy_file_range(arg1, pinoff, arg3, poutoff,
arg5, arg6));
if (!is_error(ret) && ret > 0) {
if (arg2) {
if (put_user_u64(inoff, arg2)) {
return -TARGET_EFAULT;
}
}
if (arg4) {
if (put_user_u64(outoff, arg4)) {
return -TARGET_EFAULT;
}
}
}
}
return ret;
#endif
default:
qemu_log_mask(LOG_UNIMP, "Unsupported syscall: %d\n", num);
return -TARGET_ENOSYS;