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-rw-r--r--buffered_file.c269
1 files changed, 0 insertions, 269 deletions
diff --git a/buffered_file.c b/buffered_file.c
deleted file mode 100644
index bd0f61d8c9..0000000000
--- a/buffered_file.c
+++ /dev/null
@@ -1,269 +0,0 @@
-/*
- * 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.
- *
- * Contributions after 2012-01-13 are licensed under the terms of the
- * GNU GPL, version 2 or (at your option) any later version.
- */
-
-#include "qemu-common.h"
-#include "hw/hw.h"
-#include "qemu-timer.h"
-#include "qemu-char.h"
-#include "buffered_file.h"
-
-//#define DEBUG_BUFFERED_FILE
-
-typedef struct QEMUFileBuffered
-{
- MigrationState *migration_state;
- QEMUFile *file;
- 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)) {
- DPRINTF("increasing buffer capacity from %zu by %zu\n",
- s->buffer_capacity, size + 1024);
-
- s->buffer_capacity += size + 1024;
-
- s->buffer = g_realloc(s->buffer, s->buffer_capacity);
- }
-
- memcpy(s->buffer + s->buffer_size, buf, size);
- s->buffer_size += size;
-}
-
-static ssize_t buffered_flush(QEMUFileBuffered *s)
-{
- size_t offset = 0;
- ssize_t ret = 0;
-
- DPRINTF("flushing %zu byte(s) of data\n", s->buffer_size);
-
- while (s->bytes_xfer < s->xfer_limit && offset < s->buffer_size) {
-
- ret = migrate_fd_put_buffer(s->migration_state, s->buffer + offset,
- s->buffer_size - offset);
- if (ret == -EAGAIN) {
- DPRINTF("backend not ready, freezing\n");
- ret = 0;
- s->freeze_output = 1;
- break;
- }
-
- if (ret <= 0) {
- DPRINTF("error flushing data, %zd\n", ret);
- break;
- } else {
- DPRINTF("flushed %zd byte(s)\n", ret);
- offset += ret;
- s->bytes_xfer += ret;
- }
- }
-
- DPRINTF("flushed %zu of %zu byte(s)\n", offset, s->buffer_size);
- memmove(s->buffer, s->buffer + offset, s->buffer_size - offset);
- s->buffer_size -= offset;
-
- if (ret < 0) {
- return ret;
- }
- return offset;
-}
-
-static int buffered_put_buffer(void *opaque, const uint8_t *buf, int64_t pos, int size)
-{
- QEMUFileBuffered *s = opaque;
- ssize_t error;
-
- DPRINTF("putting %d bytes at %" PRId64 "\n", size, pos);
-
- error = qemu_file_get_error(s->file);
- if (error) {
- DPRINTF("flush when error, bailing: %s\n", strerror(-error));
- return error;
- }
-
- DPRINTF("unfreezing output\n");
- s->freeze_output = 0;
-
- if (size > 0) {
- DPRINTF("buffering %d bytes\n", size - offset);
- buffered_append(s, buf, size);
- }
-
- error = buffered_flush(s);
- if (error < 0) {
- DPRINTF("buffered flush error. bailing: %s\n", strerror(-error));
- return error;
- }
-
- if (pos == 0 && size == 0) {
- DPRINTF("file is ready\n");
- if (!s->freeze_output && s->bytes_xfer < s->xfer_limit) {
- DPRINTF("notifying client\n");
- migrate_fd_put_ready(s->migration_state);
- }
- }
-
- return size;
-}
-
-static int buffered_close(void *opaque)
-{
- QEMUFileBuffered *s = opaque;
- ssize_t ret = 0;
- int ret2;
-
- DPRINTF("closing\n");
-
- s->xfer_limit = INT_MAX;
- while (!qemu_file_get_error(s->file) && s->buffer_size) {
- ret = buffered_flush(s);
- if (ret < 0) {
- break;
- }
- if (s->freeze_output) {
- ret = migrate_fd_wait_for_unfreeze(s->migration_state);
- if (ret < 0) {
- break;
- }
- }
- }
-
- ret2 = migrate_fd_close(s->migration_state);
- if (ret >= 0) {
- ret = ret2;
- }
- qemu_del_timer(s->timer);
- qemu_free_timer(s->timer);
- g_free(s->buffer);
- g_free(s);
-
- return ret;
-}
-
-/*
- * The meaning of the return values is:
- * 0: We can continue sending
- * 1: Time to stop
- * negative: There has been an error
- */
-static int buffered_get_fd(void *opaque)
-{
- QEMUFileBuffered *s = opaque;
-
- return qemu_get_fd(s->file);
-}
-
-static int buffered_rate_limit(void *opaque)
-{
- QEMUFileBuffered *s = opaque;
- int ret;
-
- ret = qemu_file_get_error(s->file);
- if (ret) {
- return ret;
- }
- if (s->freeze_output)
- return 1;
-
- if (s->bytes_xfer > s->xfer_limit)
- return 1;
-
- return 0;
-}
-
-static int64_t buffered_set_rate_limit(void *opaque, int64_t new_rate)
-{
- QEMUFileBuffered *s = opaque;
- if (qemu_file_get_error(s->file)) {
- goto out;
- }
- if (new_rate > SIZE_MAX) {
- new_rate = SIZE_MAX;
- }
-
- s->xfer_limit = new_rate / 10;
-
-out:
- return s->xfer_limit;
-}
-
-static int64_t buffered_get_rate_limit(void *opaque)
-{
- QEMUFileBuffered *s = opaque;
-
- return s->xfer_limit;
-}
-
-static void buffered_rate_tick(void *opaque)
-{
- QEMUFileBuffered *s = opaque;
-
- if (qemu_file_get_error(s->file)) {
- buffered_close(s);
- return;
- }
-
- qemu_mod_timer(s->timer, qemu_get_clock_ms(rt_clock) + 100);
-
- if (s->freeze_output)
- return;
-
- s->bytes_xfer = 0;
-
- buffered_put_buffer(s, NULL, 0, 0);
-}
-
-static const QEMUFileOps buffered_file_ops = {
- .get_fd = buffered_get_fd,
- .put_buffer = buffered_put_buffer,
- .close = buffered_close,
- .rate_limit = buffered_rate_limit,
- .get_rate_limit = buffered_get_rate_limit,
- .set_rate_limit = buffered_set_rate_limit,
-};
-
-QEMUFile *qemu_fopen_ops_buffered(MigrationState *migration_state)
-{
- QEMUFileBuffered *s;
-
- s = g_malloc0(sizeof(*s));
-
- s->migration_state = migration_state;
- s->xfer_limit = migration_state->bandwidth_limit / 10;
-
- s->file = qemu_fopen_ops(s, &buffered_file_ops);
-
- s->timer = qemu_new_timer_ms(rt_clock, buffered_rate_tick, s);
-
- qemu_mod_timer(s->timer, qemu_get_clock_ms(rt_clock) + 100);
-
- return s->file;
-}
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