[PATCH 10/20] migration: stop passing 'opaque' parameter to QEMUFile hooks

["Daniel P. Berrangé" <berrange@redhat.com>]

The only user of the hooks is RDMA which provides a QIOChannel backed
impl of QEMUFile. It can thus use the qemu_file_get_ioc() method.

Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
---
 migration/qemu-file.c |  8 ++++----
 migration/qemu-file.h | 14 ++++++--------
 migration/rdma.c      | 19 ++++++++++---------
 3 files changed, 20 insertions(+), 21 deletions(-)

diff --git a/migration/qemu-file.c b/migration/qemu-file.c
index 9a7f715e17..6badc8b0ec 100644
--- a/migration/qemu-file.c
+++ b/migration/qemu-file.c
@@ -266,7 +266,7 @@ void ram_control_before_iterate(QEMUFile *f, uint64_t flags)
     int ret = 0;
 
     if (f->hooks && f->hooks->before_ram_iterate) {
-        ret = f->hooks->before_ram_iterate(f, f->opaque, flags, NULL);
+        ret = f->hooks->before_ram_iterate(f, flags, NULL);
         if (ret < 0) {
             qemu_file_set_error(f, ret);
         }
@@ -278,7 +278,7 @@ void ram_control_after_iterate(QEMUFile *f, uint64_t flags)
     int ret = 0;
 
     if (f->hooks && f->hooks->after_ram_iterate) {
-        ret = f->hooks->after_ram_iterate(f, f->opaque, flags, NULL);
+        ret = f->hooks->after_ram_iterate(f, flags, NULL);
         if (ret < 0) {
             qemu_file_set_error(f, ret);
         }
@@ -290,7 +290,7 @@ void ram_control_load_hook(QEMUFile *f, uint64_t flags, void *data)
     int ret = -EINVAL;
 
     if (f->hooks && f->hooks->hook_ram_load) {
-        ret = f->hooks->hook_ram_load(f, f->opaque, flags, data);
+        ret = f->hooks->hook_ram_load(f, flags, data);
         if (ret < 0) {
             qemu_file_set_error(f, ret);
         }
@@ -310,7 +310,7 @@ size_t ram_control_save_page(QEMUFile *f, ram_addr_t block_offset,
                              uint64_t *bytes_sent)
 {
     if (f->hooks && f->hooks->save_page) {
-        int ret = f->hooks->save_page(f, f->opaque, block_offset,
+        int ret = f->hooks->save_page(f, block_offset,
                                       offset, size, bytes_sent);
         if (ret != RAM_SAVE_CONTROL_NOT_SUPP) {
             f->rate_limit_used += size;
diff --git a/migration/qemu-file.h b/migration/qemu-file.h
index 81f6fd7db8..6310071f90 100644
--- a/migration/qemu-file.h
+++ b/migration/qemu-file.h
@@ -65,11 +65,9 @@ typedef ssize_t (QEMUFileWritevBufferFunc)(void *opaque, struct iovec *iov,
 /*
  * This function provides hooks around different
  * stages of RAM migration.
- * 'opaque' is the backend specific data in QEMUFile
  * 'data' is call specific data associated with the 'flags' value
  */
-typedef int (QEMURamHookFunc)(QEMUFile *f, void *opaque, uint64_t flags,
-                              void *data);
+typedef int (QEMURamHookFunc)(QEMUFile *f, uint64_t flags, void *data);
 
 /*
  * Constants used by ram_control_* hooks
@@ -84,11 +82,11 @@ typedef int (QEMURamHookFunc)(QEMUFile *f, void *opaque, uint64_t flags,
  * This function allows override of where the RAM page
  * is saved (such as RDMA, for example.)
  */
-typedef size_t (QEMURamSaveFunc)(QEMUFile *f, void *opaque,
-                               ram_addr_t block_offset,
-                               ram_addr_t offset,
-                               size_t size,
-                               uint64_t *bytes_sent);
+typedef size_t (QEMURamSaveFunc)(QEMUFile *f,
+                                 ram_addr_t block_offset,
+                                 ram_addr_t offset,
+                                 size_t size,
+                                 uint64_t *bytes_sent);
 
 /*
  * Return a QEMUFile for comms in the opposite direction
diff --git a/migration/rdma.c b/migration/rdma.c
index 6e7756bee7..83265513d9 100644
--- a/migration/rdma.c
+++ b/migration/rdma.c
@@ -3256,11 +3256,11 @@ qio_channel_rdma_shutdown(QIOChannel *ioc,
  *                  sent. Usually, this will not be more than a few bytes of
  *                  the protocol because most transfers are sent asynchronously.
  */
-static size_t qemu_rdma_save_page(QEMUFile *f, void *opaque,
+static size_t qemu_rdma_save_page(QEMUFile *f,
                                   ram_addr_t block_offset, ram_addr_t offset,
                                   size_t size, uint64_t *bytes_sent)
 {
-    QIOChannelRDMA *rioc = QIO_CHANNEL_RDMA(opaque);
+    QIOChannelRDMA *rioc = QIO_CHANNEL_RDMA(qemu_file_get_ioc(f));
     RDMAContext *rdma;
     int ret;
 
@@ -3872,14 +3872,15 @@ rdma_block_notification_handle(QIOChannelRDMA *rioc, const char *name)
     return 0;
 }
 
-static int rdma_load_hook(QEMUFile *f, void *opaque, uint64_t flags, void *data)
+static int rdma_load_hook(QEMUFile *f, uint64_t flags, void *data)
 {
+    QIOChannelRDMA *rioc = QIO_CHANNEL_RDMA(qemu_file_get_ioc(f));
     switch (flags) {
     case RAM_CONTROL_BLOCK_REG:
-        return rdma_block_notification_handle(opaque, data);
+        return rdma_block_notification_handle(rioc, data);
 
     case RAM_CONTROL_HOOK:
-        return qemu_rdma_registration_handle(f, opaque);
+        return qemu_rdma_registration_handle(f, rioc);
 
     default:
         /* Shouldn't be called with any other values */
@@ -3887,10 +3888,10 @@ static int rdma_load_hook(QEMUFile *f, void *opaque, uint64_t flags, void *data)
     }
 }
 
-static int qemu_rdma_registration_start(QEMUFile *f, void *opaque,
+static int qemu_rdma_registration_start(QEMUFile *f,
                                         uint64_t flags, void *data)
 {
-    QIOChannelRDMA *rioc = QIO_CHANNEL_RDMA(opaque);
+    QIOChannelRDMA *rioc = QIO_CHANNEL_RDMA(qemu_file_get_ioc(f));
     RDMAContext *rdma;
 
     RCU_READ_LOCK_GUARD();
@@ -3916,10 +3917,10 @@ static int qemu_rdma_registration_start(QEMUFile *f, void *opaque,
  * Inform dest that dynamic registrations are done for now.
  * First, flush writes, if any.
  */
-static int qemu_rdma_registration_stop(QEMUFile *f, void *opaque,
+static int qemu_rdma_registration_stop(QEMUFile *f,
                                        uint64_t flags, void *data)
 {
-    QIOChannelRDMA *rioc = QIO_CHANNEL_RDMA(opaque);
+    QIOChannelRDMA *rioc = QIO_CHANNEL_RDMA(qemu_file_get_ioc(f));
     RDMAContext *rdma;
     RDMAControlHeader head = { .len = 0, .repeat = 1 };
     int ret = 0;
-- 
2.36.1