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-rw-r--r--Makefile.target2
-rw-r--r--buffered_file.c250
-rw-r--r--buffered_file.h30
3 files changed, 281 insertions, 1 deletions
diff --git a/Makefile.target b/Makefile.target
index e21ebac527..c0af5ecb31 100644
--- a/Makefile.target
+++ b/Makefile.target
@@ -474,7 +474,7 @@ endif #CONFIG_DARWIN_USER
ifndef CONFIG_USER_ONLY
OBJS=vl.o osdep.o monitor.o pci.o loader.o isa_mmio.o machine.o net-checksum.o
-OBJS+=fw_cfg.o aio.o
+OBJS+=fw_cfg.o aio.o buffered_file.o
ifdef CONFIG_WIN32
OBJS+=block-raw-win32.o
else
diff --git a/buffered_file.c b/buffered_file.c
new file mode 100644
index 0000000000..1d72b4637a
--- /dev/null
+++ b/buffered_file.c
@@ -0,0 +1,250 @@
+/*
+ * 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 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));
+ if (s == NULL)
+ return NULL;
+
+ 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);
+
+ 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;
+}
+
diff --git a/buffered_file.h b/buffered_file.h
new file mode 100644
index 0000000000..98d358baea
--- /dev/null
+++ b/buffered_file.h
@@ -0,0 +1,30 @@
+/*
+ * 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.
+ *
+ */
+
+#ifndef QEMU_BUFFERED_FILE_H
+#define QEMU_BUFFERED_FILE_H
+
+#include "hw/hw.h"
+
+typedef ssize_t (BufferedPutFunc)(void *opaque, const void *data, size_t size);
+typedef void (BufferedPutReadyFunc)(void *opaque);
+typedef void (BufferedWaitForUnfreezeFunc)(void *opaque);
+typedef int (BufferedCloseFunc)(void *opaque);
+
+QEMUFile *qemu_fopen_ops_buffered(void *opaque, size_t xfer_limit,
+ BufferedPutFunc *put_buffer,
+ BufferedPutReadyFunc *put_ready,
+ BufferedWaitForUnfreezeFunc *wait_for_unfreeze,
+ BufferedCloseFunc *close);
+
+#endif
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