migration: move buffered_file.c code into migration.c

This only moves the code (also from buffered_file.h to migration.h).
Fix whitespace until checkpatch is happy.

Signed-off-by: Juan Quintela <quintela@redhat.com>

1 files changed, 232 insertions, 1 deletions

diff --git a/migration.c b/migration.c
index b6374ae07..2937c87f9 100644
--- a/migration.c
+++ b/migration.c
@@ -16,7 +16,7 @@
 #include "qemu-common.h"
 #include "migration/migration.h"
 #include "monitor/monitor.h"
-#include "buffered_file.h"
+#include "migration/qemu-file.h"
 #include "sysemu/sysemu.h"
 #include "block/block.h"
 #include "qemu/sockets.h"
@@ -587,3 +587,234 @@ int64_t migrate_xbzrle_cache_size(void)
 
     return s->xbzrle_cache_size;
 }
+
+/* migration thread support */
+
+typedef struct QEMUFileBuffered {
+    MigrationState *migration_state;
+    QEMUFile *file;
+    size_t bytes_xfer;
+    size_t xfer_limit;
+    uint8_t *buffer;
+    size_t buffer_size;
+    size_t buffer_capacity;
+    QemuThread thread;
+} QEMUFileBuffered;
+
+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) {
+        size_t to_send = MIN(s->buffer_size - offset, s->xfer_limit - s->bytes_xfer);
+        ret = migrate_fd_put_buffer(s->migration_state, s->buffer + offset,
+                                    to_send);
+        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;
+    }
+
+    if (size <= 0) {
+        return 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;
+
+    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;
+        }
+    }
+
+    ret2 = migrate_fd_close(s->migration_state);
+    if (ret >= 0) {
+        ret = ret2;
+    }
+    ret = migrate_fd_close(s->migration_state);
+    s->migration_state->complete = true;
+    return ret;
+}
+
+static int buffered_get_fd(void *opaque)
+{
+    QEMUFileBuffered *s = opaque;
+
+    return qemu_get_fd(s->file);
+}
+
+/*
+ * 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_rate_limit(void *opaque)
+{
+    QEMUFileBuffered *s = opaque;
+    int ret;
+
+    ret = qemu_file_get_error(s->file);
+    if (ret) {
+        return ret;
+    }
+
+    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;
+}
+
+/* 100ms  xfer_limit is the limit that we should write each 100ms */
+#define BUFFER_DELAY 100
+
+static void *buffered_file_thread(void *opaque)
+{
+    QEMUFileBuffered *s = opaque;
+    int64_t initial_time = qemu_get_clock_ms(rt_clock);
+    int64_t max_size = 0;
+    bool last_round = false;
+
+    while (true) {
+        int64_t current_time = qemu_get_clock_ms(rt_clock);
+
+        if (s->migration_state->complete) {
+            break;
+        }
+        if (current_time >= initial_time + BUFFER_DELAY) {
+            uint64_t transferred_bytes = s->bytes_xfer;
+            uint64_t time_spent = current_time - initial_time;
+            double bandwidth = transferred_bytes / time_spent;
+            max_size = bandwidth * migrate_max_downtime() / 1000000;
+
+            DPRINTF("transferred %" PRIu64 " time_spent %" PRIu64
+                    " bandwidth %g max_size %" PRId64 "\n",
+                    transferred_bytes, time_spent, bandwidth, max_size);
+
+            s->bytes_xfer = 0;
+            initial_time = current_time;
+        }
+        if (!last_round && (s->bytes_xfer >= s->xfer_limit)) {
+            /* usleep expects microseconds */
+            g_usleep((initial_time + BUFFER_DELAY - current_time)*1000);
+        }
+        if (buffered_flush(s) < 0) {
+            break;
+        }
+
+        DPRINTF("file is ready\n");
+        if (s->bytes_xfer < s->xfer_limit) {
+            DPRINTF("notifying client\n");
+            last_round = migrate_fd_put_ready(s->migration_state, max_size);
+        }
+    }
+
+    g_free(s->buffer);
+    g_free(s);
+    return NULL;
+}
+
+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,
+};
+
+void 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->migration_state->complete = false;
+
+    s->file = qemu_fopen_ops(s, &buffered_file_ops);
+
+    migration_state->file = s->file;
+
+    qemu_thread_create(&s->thread, buffered_file_thread, s,
+                       QEMU_THREAD_DETACHED);
+}