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copy: teach copy_bytes() btrfs reflink magic

This commit is contained in:
Lennart Poettering 2014-12-12 03:20:53 +01:00
parent f9ac15442e
commit 0254b455e9
1 changed files with 9 additions and 2 deletions
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11
src/shared/copy.c
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@ -27,10 +27,18 @@
int copy_bytes(int fdf, int fdt, off_t max_bytes) {
bool try_sendfile = true;
int r;
assert(fdf >= 0);
assert(fdt >= 0);
/* Try btrfs reflinks first. */
if (max_bytes == (off_t) -1) {
r = btrfs_reflink(fdf, fdt);
if (r >= 0)
return 0;
}
for (;;) {
size_t m = PIPE_BUF;
ssize_t n;
@ -64,7 +72,6 @@ int copy_bytes(int fdf, int fdt, off_t max_bytes) {
/* As a fallback just copy bits by hand */
{
char buf[m];
int r;
n = read(fdf, buf, m);
if (n < 0)
@ -72,7 +79,7 @@ int copy_bytes(int fdf, int fdt, off_t max_bytes) {
if (n == 0) /* EOF */
break;
r = loop_write(fdt, buf, n, false);
r = loop_write(fdt, buf, (size_t) n, false);
if (r < 0)
return r;