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moved file copy to kernel space to speed up transfer

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This commit is contained in:
overflowerror 2021-04-29 18:36:10 +02:00
parent 907f928c2f
commit 2986a26c43
1 changed files with 32 additions and 3 deletions
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35
src/util.c
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@ -4,6 +4,8 @@
#include <stdlib.h>
#include <errno.h>
#include <stdio.h>
#include <sys/sendfile.h>
#include <fcntl.h>
#include <pthread.h>
@ -134,14 +136,41 @@ int startCopyThread(int from, int to, bool closeWriteFd, pthread_t* thread) {
return pthread_create(thread, NULL, &fileCopyThread, files);
}
#define FILE_COPY_BUFFER_SIZE (1024)
size_t fileCopyThreadFallback(struct fileCopy* files) {
char c[FILE_COPY_BUFFER_SIZE];
size_t total = 0;
int tmp;
while((tmp = read(files->readFd, c, FILE_COPY_BUFFER_SIZE)) > 0) {
write(files->writeFd, c, tmp);
total += tmp;
}
return total;
}
void* fileCopyThread(void* data) {
struct fileCopy* files = (struct fileCopy*) data;
char c;
while(read(files->readFd, &c, 1) > 0) {
write(files->writeFd, &c, 1);
errno = EACCES;
size_t total = 0;
int tmp;
while((tmp = splice(files->readFd, NULL, files->writeFd, NULL, FILE_COPY_BUFFER_SIZE, 0)) > 0) {
total += tmp;
}
if (errno != EACCES) {
debug("util: splice: %s", strerror(errno));
debug("util: falling back to userland copy");
total = fileCopyThreadFallback(files);
}
debug("util: filecopy: %d bytes copied", total);
if (files->closeWriteFd)
close(files->writeFd);