migration: use QEMUFile for migration channel lifetime

As a start, use QEMUFile to store the destination and close it.
qemu_get_fd gets a file descriptor that will be used by the write
callbacks.

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>

1 files changed, 3 insertions, 32 deletions

diff --git a/migration-fd.c b/migration-fd.c
index a99e0e3971..463645794c 100644
--- a/migration-fd.c
+++ b/migration-fd.c
@@ -40,45 +40,16 @@ static int fd_write(MigrationState *s, const void * buf, size_t size)
     return write(s->fd, buf, size);
 }
 
-static int fd_close(MigrationState *s)
-{
-    struct stat st;
-    int ret;
-
-    DPRINTF("fd_close\n");
-    ret = fstat(s->fd, &st);
-    if (ret == 0 && S_ISREG(st.st_mode)) {
-        /*
-         * If the file handle is a regular file make sure the
-         * data is flushed to disk before signaling success.
-         */
-        ret = fsync(s->fd);
-        if (ret != 0) {
-            ret = -errno;
-            perror("migration-fd: fsync");
-            return ret;
-        }
-    }
-    ret = close(s->fd);
-    s->fd = -1;
-    if (ret != 0) {
-        ret = -errno;
-        perror("migration-fd: close");
-    }
-    return ret;
-}
-
 void fd_start_outgoing_migration(MigrationState *s, const char *fdname, Error **errp)
 {
-    s->fd = monitor_get_fd(cur_mon, fdname, errp);
-    if (s->fd == -1) {
+    int fd = monitor_get_fd(cur_mon, fdname, errp);
+    if (fd == -1) {
         return;
     }
+    s->migration_file = qemu_fdopen(fd, "wb");
 
     s->get_error = fd_errno;
     s->write = fd_write;
-    s->close = fd_close;
-
     migrate_fd_connect(s);
 }