![Glauber Costa](/assets/img/avatar_default.png)
This patch converts the current callers of qemu_fopen_ops(). Signed-off-by: Glauber Costa <glommer@redhat.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
262 lines
6 KiB
C
262 lines
6 KiB
C
/*
|
|
* QEMU buffered QEMUFile
|
|
*
|
|
* Copyright IBM, Corp. 2008
|
|
*
|
|
* Authors:
|
|
* Anthony Liguori <aliguori@us.ibm.com>
|
|
*
|
|
* This work is licensed under the terms of the GNU GPL, version 2. See
|
|
* the COPYING file in the top-level directory.
|
|
*
|
|
*/
|
|
|
|
#include "qemu-common.h"
|
|
#include "hw/hw.h"
|
|
#include "qemu-timer.h"
|
|
#include "sysemu.h"
|
|
#include "qemu-char.h"
|
|
#include "buffered_file.h"
|
|
|
|
//#define DEBUG_BUFFERED_FILE
|
|
|
|
typedef struct QEMUFileBuffered
|
|
{
|
|
BufferedPutFunc *put_buffer;
|
|
BufferedPutReadyFunc *put_ready;
|
|
BufferedWaitForUnfreezeFunc *wait_for_unfreeze;
|
|
BufferedCloseFunc *close;
|
|
void *opaque;
|
|
QEMUFile *file;
|
|
int has_error;
|
|
int freeze_output;
|
|
size_t bytes_xfer;
|
|
size_t xfer_limit;
|
|
uint8_t *buffer;
|
|
size_t buffer_size;
|
|
size_t buffer_capacity;
|
|
QEMUTimer *timer;
|
|
} QEMUFileBuffered;
|
|
|
|
#ifdef DEBUG_BUFFERED_FILE
|
|
#define dprintf(fmt, ...) \
|
|
do { printf("buffered-file: " fmt, ## __VA_ARGS__); } while (0)
|
|
#else
|
|
#define dprintf(fmt, ...) \
|
|
do { } while (0)
|
|
#endif
|
|
|
|
static void buffered_append(QEMUFileBuffered *s,
|
|
const uint8_t *buf, size_t size)
|
|
{
|
|
if (size > (s->buffer_capacity - s->buffer_size)) {
|
|
void *tmp;
|
|
|
|
dprintf("increasing buffer capacity from %ld by %ld\n",
|
|
s->buffer_capacity, size + 1024);
|
|
|
|
s->buffer_capacity += size + 1024;
|
|
|
|
tmp = qemu_realloc(s->buffer, s->buffer_capacity);
|
|
if (tmp == NULL) {
|
|
fprintf(stderr, "qemu file buffer expansion failed\n");
|
|
exit(1);
|
|
}
|
|
|
|
s->buffer = tmp;
|
|
}
|
|
|
|
memcpy(s->buffer + s->buffer_size, buf, size);
|
|
s->buffer_size += size;
|
|
}
|
|
|
|
static void buffered_flush(QEMUFileBuffered *s)
|
|
{
|
|
size_t offset = 0;
|
|
|
|
if (s->has_error) {
|
|
dprintf("flush when error, bailing\n");
|
|
return;
|
|
}
|
|
|
|
dprintf("flushing %ld byte(s) of data\n", s->buffer_size);
|
|
|
|
while (offset < s->buffer_size) {
|
|
ssize_t ret;
|
|
|
|
ret = s->put_buffer(s->opaque, s->buffer + offset,
|
|
s->buffer_size - offset);
|
|
if (ret == -EAGAIN) {
|
|
dprintf("backend not ready, freezing\n");
|
|
s->freeze_output = 1;
|
|
break;
|
|
}
|
|
|
|
if (ret <= 0) {
|
|
dprintf("error flushing data, %ld\n", ret);
|
|
s->has_error = 1;
|
|
break;
|
|
} else {
|
|
dprintf("flushed %ld byte(s)\n", ret);
|
|
offset += ret;
|
|
}
|
|
}
|
|
|
|
dprintf("flushed %ld of %ld byte(s)\n", offset, s->buffer_size);
|
|
memmove(s->buffer, s->buffer + offset, s->buffer_size - offset);
|
|
s->buffer_size -= offset;
|
|
}
|
|
|
|
static int buffered_put_buffer(void *opaque, const uint8_t *buf, int64_t pos, int size)
|
|
{
|
|
QEMUFileBuffered *s = opaque;
|
|
int offset = 0;
|
|
ssize_t ret;
|
|
|
|
dprintf("putting %ld bytes at %Ld\n", size, pos);
|
|
|
|
if (s->has_error) {
|
|
dprintf("flush when error, bailing\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
dprintf("unfreezing output\n");
|
|
s->freeze_output = 0;
|
|
|
|
buffered_flush(s);
|
|
|
|
while (!s->freeze_output && offset < size) {
|
|
if (s->bytes_xfer > s->xfer_limit) {
|
|
dprintf("transfer limit exceeded when putting\n");
|
|
break;
|
|
}
|
|
|
|
ret = s->put_buffer(s->opaque, buf + offset, size - offset);
|
|
if (ret == -EAGAIN) {
|
|
dprintf("backend not ready, freezing\n");
|
|
s->freeze_output = 1;
|
|
break;
|
|
}
|
|
|
|
if (ret <= 0) {
|
|
dprintf("error putting\n");
|
|
s->has_error = 1;
|
|
offset = -EINVAL;
|
|
break;
|
|
}
|
|
|
|
dprintf("put %ld byte(s)\n", ret);
|
|
offset += ret;
|
|
s->bytes_xfer += ret;
|
|
}
|
|
|
|
if (offset >= 0) {
|
|
dprintf("buffering %ld bytes\n", size - offset);
|
|
buffered_append(s, buf + offset, size - offset);
|
|
offset = size;
|
|
}
|
|
|
|
return offset;
|
|
}
|
|
|
|
static int buffered_close(void *opaque)
|
|
{
|
|
QEMUFileBuffered *s = opaque;
|
|
int ret;
|
|
|
|
dprintf("closing\n");
|
|
|
|
while (!s->has_error && s->buffer_size) {
|
|
buffered_flush(s);
|
|
if (s->freeze_output)
|
|
s->wait_for_unfreeze(s);
|
|
}
|
|
|
|
ret = s->close(s->opaque);
|
|
|
|
qemu_del_timer(s->timer);
|
|
qemu_free_timer(s->timer);
|
|
qemu_free(s->buffer);
|
|
qemu_free(s);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int buffered_rate_limit(void *opaque)
|
|
{
|
|
QEMUFileBuffered *s = opaque;
|
|
|
|
if (s->has_error)
|
|
return 0;
|
|
|
|
if (s->freeze_output)
|
|
return 1;
|
|
|
|
if (s->bytes_xfer > s->xfer_limit)
|
|
return 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static size_t buffered_set_rate_limit(void *opaque, size_t new_rate)
|
|
{
|
|
QEMUFileBuffered *s = opaque;
|
|
|
|
if (s->has_error)
|
|
goto out;
|
|
|
|
s->xfer_limit = new_rate / 10;
|
|
|
|
out:
|
|
return s->xfer_limit;
|
|
}
|
|
|
|
static void buffered_rate_tick(void *opaque)
|
|
{
|
|
QEMUFileBuffered *s = opaque;
|
|
|
|
if (s->has_error)
|
|
return;
|
|
|
|
qemu_mod_timer(s->timer, qemu_get_clock(rt_clock) + 100);
|
|
|
|
if (s->freeze_output)
|
|
return;
|
|
|
|
s->bytes_xfer = 0;
|
|
|
|
buffered_flush(s);
|
|
|
|
/* Add some checks around this */
|
|
s->put_ready(s->opaque);
|
|
}
|
|
|
|
QEMUFile *qemu_fopen_ops_buffered(void *opaque,
|
|
size_t bytes_per_sec,
|
|
BufferedPutFunc *put_buffer,
|
|
BufferedPutReadyFunc *put_ready,
|
|
BufferedWaitForUnfreezeFunc *wait_for_unfreeze,
|
|
BufferedCloseFunc *close)
|
|
{
|
|
QEMUFileBuffered *s;
|
|
|
|
s = qemu_mallocz(sizeof(*s));
|
|
|
|
s->opaque = opaque;
|
|
s->xfer_limit = bytes_per_sec / 10;
|
|
s->put_buffer = put_buffer;
|
|
s->put_ready = put_ready;
|
|
s->wait_for_unfreeze = wait_for_unfreeze;
|
|
s->close = close;
|
|
|
|
s->file = qemu_fopen_ops(s, buffered_put_buffer, NULL,
|
|
buffered_close, buffered_rate_limit,
|
|
buffered_set_rate_limit);
|
|
|
|
s->timer = qemu_new_timer(rt_clock, buffered_rate_tick, s);
|
|
|
|
qemu_mod_timer(s->timer, qemu_get_clock(rt_clock) + 100);
|
|
|
|
return s->file;
|
|
}
|