migration/multifd: Pass in MultiFDPages_t to file_write_ramblock_iov

We want to stop dereferencing 'pages' so it can be replaced by an
opaque pointer in the next patches.

Reviewed-by: Peter Xu <peterx@redhat.com>
Signed-off-by: Fabiano Rosas <farosas@suse.de>

migration/file.c

@@ -196,12 +196,13 @@ void file_start_incoming_migration(FileMigrationArgs *file_args, Error **errp)
 }
 
 int file_write_ramblock_iov(QIOChannel *ioc, const struct iovec *iov,
-                            int niov, RAMBlock *block, Error **errp)
+                            int niov, MultiFDPages_t *pages, Error **errp)
 {
     ssize_t ret = 0;
     int i, slice_idx, slice_num;
     uintptr_t base, next, offset;
     size_t len;
+    RAMBlock *block = pages->block;
 
     slice_idx = 0;
     slice_num = 1;

migration/file.h

@@ -21,6 +21,6 @@ int file_parse_offset(char *filespec, uint64_t *offsetp, Error **errp);
 void file_cleanup_outgoing_migration(void);
 bool file_send_channel_create(gpointer opaque, Error **errp);
 int file_write_ramblock_iov(QIOChannel *ioc, const struct iovec *iov,
-                            int niov, RAMBlock *block, Error **errp);
+                            int niov, MultiFDPages_t *pages, Error **errp);
 int multifd_file_recv_data(MultiFDRecvParams *p, Error **errp);
 #endif

migration/multifd.c

@@ -956,7 +956,7 @@ static void *multifd_send_thread(void *opaque)
 
             if (migrate_mapped_ram()) {
                 ret = file_write_ramblock_iov(p->c, p->iov, p->iovs_num,
-                                              pages->block, &local_err);
+                                              pages, &local_err);
             } else {
                 ret = qio_channel_writev_full_all(p->c, p->iov, p->iovs_num,
                                                   NULL, 0, p->write_flags,