[PATCH 1/4] qemu-file: Don't do IO after shutdown

[Juan Quintela]

Be sure that we are not doing neither read/write after shutdown of the
QEMUFile.

Signed-off-by: Juan Quintela <address@hidden>
---
 migration/qemu-file.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/migration/qemu-file.c b/migration/qemu-file.c
index 26fb25ddc1..1e5543a279 100644
--- a/migration/qemu-file.c
+++ b/migration/qemu-file.c
@@ -53,6 +53,8 @@ struct QEMUFile {
 
     int last_error;
     Error *last_error_obj;
+    /* has the file has been shutdown */
+    bool shutdown;
 };
 
 /*
@@ -61,6 +63,7 @@ struct QEMUFile {
  */
 int qemu_file_shutdown(QEMUFile *f)
 {
+    f->shutdown = true;
     if (!f->ops->shut_down) {
         return -ENOSYS;
     }
@@ -214,6 +217,9 @@ void qemu_fflush(QEMUFile *f)
         return;
     }
 
+    if (f->shutdown) {
+        return;
+    }
     if (f->iovcnt > 0) {
         expect = iov_size(f->iov, f->iovcnt);
         ret = f->ops->writev_buffer(f->opaque, f->iov, f->iovcnt, f->pos,
@@ -328,6 +334,10 @@ static ssize_t qemu_fill_buffer(QEMUFile *f)
     f->buf_index = 0;
     f->buf_size = pending;
 
+    if (f->shutdown) {
+        return 0;
+    }
+
     len = f->ops->get_buffer(f->opaque, f->buf + pending, f->pos,
                              IO_BUF_SIZE - pending, &local_error);
     if (len > 0) {
@@ -642,6 +652,9 @@ int64_t qemu_ftell(QEMUFile *f)
 
 int qemu_file_rate_limit(QEMUFile *f)
 {
+    if (f->shutdown) {
+        return 1;
+    }
     if (qemu_file_get_error(f)) {
         return 1;
     }
-- 
2.23.0