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#include "network_backends.h"
#ifdef USE_LINUX_SENDFILE
#include "network.h"
#include "fdevent.h"
#include "log.h"
#include "stat_cache.h"
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <errno.h>
#include <fcntl.h>
#include <unistd.h>
#include <netdb.h>
#include <string.h>
#include <stdlib.h>
#include <fcntl.h>
/* on linux 2.4.29 + debian/ubuntu we have crashes if this is enabled */
#undef HAVE_POSIX_FADVISE
int network_write_chunkqueue_linuxsendfile(server *srv, connection *con, int fd, chunkqueue *cq) {
chunk *c;
size_t chunks_written = 0;
for(c = cq->first; c; c = c->next, chunks_written++) {
int chunk_finished = 0;
switch(c->type) {
case MEM_CHUNK: {
char * offset;
size_t toSend;
ssize_t r;
size_t num_chunks, i;
struct iovec chunks[UIO_MAXIOV];
chunk *tc;
size_t num_bytes = 0;
/* we can't send more then SSIZE_MAX bytes in one chunk */
/* build writev list
*
* 1. limit: num_chunks < UIO_MAXIOV
* 2. limit: num_bytes < SSIZE_MAX
*/
for (num_chunks = 0, tc = c;
tc && tc->type == MEM_CHUNK && num_chunks < UIO_MAXIOV;
tc = tc->next, num_chunks++);
for (tc = c, i = 0; i < num_chunks; tc = tc->next, i++) {
if (tc->mem->used == 0) {
chunks[i].iov_base = tc->mem->ptr;
chunks[i].iov_len = 0;
} else {
offset = tc->mem->ptr + tc->offset;
toSend = tc->mem->used - 1 - tc->offset;
chunks[i].iov_base = offset;
/* protect the return value of writev() */
if (toSend > SSIZE_MAX ||
num_bytes + toSend > SSIZE_MAX) {
chunks[i].iov_len = SSIZE_MAX - num_bytes;
num_chunks = i + 1;
break;
} else {
chunks[i].iov_len = toSend;
}
num_bytes += toSend;
}
}
if ((r = writev(fd, chunks, num_chunks)) < 0) {
switch (errno) {
case EAGAIN:
case EINTR:
r = 0;
break;
case EPIPE:
case ECONNRESET:
return -2;
default:
log_error_write(srv, __FILE__, __LINE__, "ssd",
"writev failed:", strerror(errno), fd);
return -1;
}
}
/* check which chunks have been written */
cq->bytes_out += r;
for(i = 0, tc = c; i < num_chunks; i++, tc = tc->next) {
if (r >= (ssize_t)chunks[i].iov_len) {
/* written */
r -= chunks[i].iov_len;
tc->offset += chunks[i].iov_len;
if (chunk_finished) {
/* skip the chunks from further touches */
chunks_written++;
c = c->next;
} else {
/* chunks_written + c = c->next is done in the for()*/
chunk_finished++;
}
} else {
/* partially written */
tc->offset += r;
chunk_finished = 0;
break;
}
}
break;
}
case FILE_CHUNK: {
ssize_t r;
off_t offset;
size_t toSend;
stat_cache_entry *sce = NULL;
offset = c->file.start + c->offset;
/* limit the toSend to 2^31-1 bytes in a chunk */
toSend = c->file.length - c->offset > ((1 << 30) - 1) ?
((1 << 30) - 1) : c->file.length - c->offset;
/* open file if not already opened */
if (-1 == c->file.fd) {
if (-1 == (c->file.fd = open(c->file.name->ptr, O_RDONLY))) {
log_error_write(srv, __FILE__, __LINE__, "ss", "open failed: ", strerror(errno));
return -1;
}
#ifdef FD_CLOEXEC
fcntl(c->file.fd, F_SETFD, FD_CLOEXEC);
#endif
#ifdef HAVE_POSIX_FADVISE
/* tell the kernel that we want to stream the file */
if (-1 == posix_fadvise(c->file.fd, 0, 0, POSIX_FADV_SEQUENTIAL)) {
if (ENOSYS != errno) {
log_error_write(srv, __FILE__, __LINE__, "ssd",
"posix_fadvise failed:", strerror(errno), c->file.fd);
}
}
#endif
}
if (-1 == (r = sendfile(fd, c->file.fd, &offset, toSend))) {
switch (errno) {
case EAGAIN:
case EINTR:
/* ok, we can't send more, let's try later again */
r = 0;
break;
case EPIPE:
case ECONNRESET:
return -2;
default:
log_error_write(srv, __FILE__, __LINE__, "ssd",
"sendfile failed:", strerror(errno), fd);
return -1;
}
} else if (r == 0) {
int oerrno = errno;
/* We got an event to write but we wrote nothing
*
* - the file shrinked -> error
* - the remote side closed inbetween -> remote-close */
if (HANDLER_ERROR == stat_cache_get_entry(srv, con, c->file.name, &sce)) {
/* file is gone ? */
return -1;
}
if (offset > sce->st.st_size) {
/* file shrinked, close the connection */
errno = oerrno;
return -1;
}
errno = oerrno;
return -2;
}
#ifdef HAVE_POSIX_FADVISE
#if 0
#define K * 1024
#define M * 1024 K
#define READ_AHEAD 4 M
/* check if we need a new chunk */
if ((c->offset & ~(READ_AHEAD - 1)) != ((c->offset + r) & ~(READ_AHEAD - 1))) {
/* tell the kernel that we want to stream the file */
if (-1 == posix_fadvise(c->file.fd, (c->offset + r) & ~(READ_AHEAD - 1), READ_AHEAD, POSIX_FADV_NOREUSE)) {
log_error_write(srv, __FILE__, __LINE__, "ssd",
"posix_fadvise failed:", strerror(errno), c->file.fd);
}
}
#endif
#endif
c->offset += r;
cq->bytes_out += r;
if (c->offset == c->file.length) {
chunk_finished = 1;
/* chunk_free() / chunk_reset() will cleanup for us but it is a ok to be faster :) */
if (c->file.fd != -1) {
close(c->file.fd);
c->file.fd = -1;
}
}
break;
}
default:
log_error_write(srv, __FILE__, __LINE__, "ds", c, "type not known");
return -1;
}
if (!chunk_finished) {
/* not finished yet */
break;
}
}
return chunks_written;
}
#endif
#if 0
network_linuxsendfile_init(void) {
p->write = network_linuxsendfile_write_chunkset;
}
#endif
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