migration: eliminate s->migration_file

The indirection is useless now.  Backends can open s->file directly.

Reviewed-by: Orit Wasserman <owasserm@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>

include/migration/migration.h

@@ -36,9 +36,7 @@ struct MigrationState
     size_t xfer_limit;
     QemuThread thread;
     QEMUBH *cleanup_bh;
-
     QEMUFile *file;
-    QEMUFile *migration_file;
 
     int state;
     MigrationParams params;

migration-exec.c

@@ -35,8 +35,8 @@
 
 void exec_start_outgoing_migration(MigrationState *s, const char *command, Error **errp)
 {
-    s->migration_file = qemu_popen_cmd(command, "w");
-    if (s->migration_file == NULL) {
+    s->file = qemu_popen_cmd(command, "w");
+    if (s->file == NULL) {
         error_setg_errno(errp, errno, "failed to popen the migration target");
         return;
     }

migration-fd.c

@@ -36,7 +36,7 @@ void fd_start_outgoing_migration(MigrationState *s, const char *fdname, Error **
     if (fd == -1) {
         return;
     }
-    s->migration_file = qemu_fdopen(fd, "wb");
+    s->file = qemu_fdopen(fd, "wb");
 
     migrate_fd_connect(s);
 }

migration-tcp.c

@@ -35,11 +35,11 @@ static void tcp_wait_for_connect(int fd, void *opaque)
 
     if (fd < 0) {
         DPRINTF("migrate connect error\n");
-        s->migration_file = NULL;
+        s->file = NULL;
         migrate_fd_error(s);
     } else {
         DPRINTF("migrate connect success\n");
-        s->migration_file = qemu_fopen_socket(fd, "wb");
+        s->file = qemu_fopen_socket(fd, "wb");
         migrate_fd_connect(s);
     }
 }

migration-unix.c

@@ -35,11 +35,11 @@ static void unix_wait_for_connect(int fd, void *opaque)
 
     if (fd < 0) {
         DPRINTF("migrate connect error\n");
-        s->migration_file = NULL;
+        s->file = NULL;
         migrate_fd_error(s);
     } else {
         DPRINTF("migrate connect success\n");
-        s->migration_file = qemu_fopen_socket(fd, "wb");
+        s->file = qemu_fopen_socket(fd, "wb");
         migrate_fd_connect(s);
     }
 }

migration.c

@@ -270,17 +270,14 @@ static void migrate_fd_cleanup(void *opaque)
 
     if (s->file) {
         DPRINTF("closing file\n");
-        qemu_fclose(s->file);
-        s->file = NULL;
-
         qemu_mutex_unlock_iothread();
         qemu_thread_join(&s->thread);
         qemu_mutex_lock_iothread();
 
         migrate_fd_close(s);
     }
 
-    assert(s->migration_file == NULL);
+    assert(s->file == NULL);
     assert(s->state != MIG_STATE_ACTIVE);
 
     if (s->state != MIG_STATE_COMPLETED) {
@@ -317,9 +314,9 @@ static void migrate_fd_cancel(MigrationState *s)
 int migrate_fd_close(MigrationState *s)
 {
     int rc = 0;
-    if (s->migration_file != NULL) {
-        rc = qemu_fclose(s->migration_file);
-        s->migration_file = NULL;
+    if (s->file != NULL) {
+        rc = qemu_fclose(s->file);
+        s->file = NULL;
     }
     return rc;
 }
@@ -506,39 +503,6 @@ int64_t migrate_xbzrle_cache_size(void)
 
 /* migration thread support */
 
-static int migration_put_buffer(void *opaque, const uint8_t *buf,
-                               int64_t pos, int size)
-{
-    MigrationState *s = opaque;
-    int ret;
-
-    DPRINTF("putting %d bytes at %" PRId64 "\n", size, pos);
-
-    if (size <= 0) {
-        return size;
-    }
-
-    qemu_put_buffer(s->migration_file, buf, size);
-    ret = qemu_file_get_error(s->migration_file);
-    if (ret) {
-        return ret;
-    }
-
-    return size;
-}
-
-static int migration_close(void *opaque)
-{
-    return 0;
-}
-
-static int migration_get_fd(void *opaque)
-{
-    MigrationState *s = opaque;
-
-    return qemu_get_fd(s->migration_file);
-}
-
 static void *migration_thread(void *opaque)
 {
     MigrationState *s = opaque;
@@ -628,12 +592,6 @@ static void *migration_thread(void *opaque)
     return NULL;
 }
 
-static const QEMUFileOps migration_file_ops = {
-    .get_fd =         migration_get_fd,
-    .put_buffer =     migration_put_buffer,
-    .close =          migration_close,
-};
-
 void migrate_fd_connect(MigrationState *s)
 {
     s->state = MIG_STATE_ACTIVE;
@@ -642,7 +600,6 @@ void migrate_fd_connect(MigrationState *s)
     /* This is a best 1st approximation. ns to ms */
     s->expected_downtime = max_downtime/1000000;
     s->cleanup_bh = qemu_bh_new(migrate_fd_cleanup, s);
-    s->file = qemu_fopen_ops(s, &migration_file_ops);
 
     qemu_file_set_rate_limit(s->file,
                              s->bandwidth_limit / XFER_LIMIT_RATIO);