#define COPY_BUFFER_SIZE (16*1024)
-int copy_bytes(int fdf, int fdt, off_t max_bytes, bool try_reflink) {
+int copy_bytes(int fdf, int fdt, uint64_t max_bytes, bool try_reflink) {
bool try_sendfile = true, try_splice = true;
int r;
assert(fdt >= 0);
#if 0
/* Try btrfs reflinks first. */
- if (try_reflink && max_bytes == (off_t) -1) {
+ if (try_reflink &&
+ max_bytes == (uint64_t) -1 &&
+ lseek(fdf, 0, SEEK_CUR) == 0 &&
+ lseek(fdt, 0, SEEK_CUR) == 0) {
+
r = btrfs_reflink(fdf, fdt);
if (r >= 0)
- return r;
+ return 0; /* we copied the whole thing, hence hit EOF, return 0 */
}
#endif // 0
for (;;) {
size_t m = COPY_BUFFER_SIZE;
ssize_t n;
- if (max_bytes != (off_t) -1) {
+ if (max_bytes != (uint64_t) -1) {
if (max_bytes <= 0)
return -EFBIG;
- if ((off_t) m > max_bytes)
+ if ((uint64_t) m > max_bytes)
m = (size_t) max_bytes;
}
/* As a fallback just copy bits by hand */
{
- char buf[m];
+ uint8_t buf[m];
n = read(fdf, buf, m);
if (n < 0)
}
next:
- if (max_bytes != (off_t) -1) {
- assert(max_bytes >= n);
+ if (max_bytes != (uint64_t) -1) {
+ assert(max_bytes >= (uint64_t) n);
max_bytes -= n;
}
}
- return 0;
+ return 0; /* return 0 if we hit EOF earlier than the size limit */
}
// UNNEEDED by elogind
if (fdt < 0)
return -errno;
- r = copy_bytes(fdf, fdt, (off_t) -1, true);
+ r = copy_bytes(fdf, fdt, (uint64_t) -1, true);
if (r < 0) {
unlinkat(dt, to, 0);
return r;
if (fdf < 0)
return -errno;
- r = copy_bytes(fdf, fdt, (off_t) -1, try_reflink);
+ r = copy_bytes(fdf, fdt, (uint64_t) -1, try_reflink);
(void) copy_times(fdf, fdt);
(void) copy_xattr(fdf, fdt);