[Qemu-devel] [PATCH 22/27] migration: make writes blocking

[Juan Quintela <quintela@redhat.com>]

Move all the writes to the migration_thread, and make writings
blocking.  Notice that are still using the iothread for everything
that we do.

Signed-off-by: Juan Quintela <quintela@redhat.com>
---
 migration-exec.c |    2 --
 migration-fd.c   |    6 ------
 migration-tcp.c  |    2 +-
 migration-unix.c |    2 --
 migration.c      |   18 ------------------
 qemu-file.h      |    5 -----
 savevm.c         |    5 -----
 7 files changed, 1 insertion(+), 39 deletions(-)

diff --git a/migration-exec.c b/migration-exec.c
index 6c97db9..908f22e 100644
--- a/migration-exec.c
+++ b/migration-exec.c
@@ -76,8 +76,6 @@ int exec_start_outgoing_migration(MigrationState *s, const char *command)
         goto err_after_open;
     }

-    socket_set_nonblock(s->fd);
-
     s->opaque = qemu_popen(f, "w");

     s->close = exec_close;
diff --git a/migration-fd.c b/migration-fd.c
index 50138ed..e5be972 100644
--- a/migration-fd.c
+++ b/migration-fd.c
@@ -81,11 +81,6 @@ int fd_start_outgoing_migration(MigrationState *s, const char *fdname)
         goto err_after_get_fd;
     }

-    if (fcntl(s->fd, F_SETFL, O_NONBLOCK) == -1) {
-        DPRINTF("Unable to set nonblocking mode on file descriptor\n");
-        goto err_after_open;
-    }
-
     s->get_error = fd_errno;
     s->write = fd_write;
     s->close = fd_close;
@@ -93,7 +88,6 @@ int fd_start_outgoing_migration(MigrationState *s, const char *fdname)
     migrate_fd_connect(s);
     return 0;

-err_after_open:
     close(s->fd);
 err_after_get_fd:
     return -1;
diff --git a/migration-tcp.c b/migration-tcp.c
index 440804d..d2bfb03 100644
--- a/migration-tcp.c
+++ b/migration-tcp.c
@@ -86,7 +86,7 @@ int tcp_start_outgoing_migration(MigrationState *s, const char *host_port,
     s->write = socket_write;
     s->close = tcp_close;

-    s->fd = inet_connect(host_port, false, errp);
+    s->fd = inet_connect(host_port, true, errp);

     if (!error_is_set(errp)) {
         migrate_fd_connect(s);
diff --git a/migration-unix.c b/migration-unix.c
index 169de88..bb41bac 100644
--- a/migration-unix.c
+++ b/migration-unix.c
@@ -96,8 +96,6 @@ int unix_start_outgoing_migration(MigrationState *s, const char *path)
         return -errno;
     }

-    socket_set_nonblock(s->fd);
-
     do {
         ret = connect(s->fd, (struct sockaddr *)&addr, sizeof(addr));
         if (ret == -1) {
diff --git a/migration.c b/migration.c
index e3eec97..fe2afd0 100644
--- a/migration.c
+++ b/migration.c
@@ -257,8 +257,6 @@ static int migrate_fd_cleanup(MigrationState *s)
 {
     int ret = 0;

-    qemu_set_fd_handler2(s->fd, NULL, NULL, NULL, NULL);
-
     if (s->file) {
         DPRINTF("closing file\n");
         ret = qemu_fclose(s->file);
@@ -293,17 +291,6 @@ static void migrate_fd_completed(MigrationState *s)
     notifier_list_notify(&migration_state_notifiers, s);
 }

-static void migrate_fd_put_notify(void *opaque)
-{
-    MigrationState *s = opaque;
-
-    qemu_set_fd_handler2(s->fd, NULL, NULL, NULL, NULL);
-    qemu_file_put_notify(s->file);
-    if (s->file && qemu_file_get_error(s->file)) {
-        migrate_fd_error(s);
-    }
-}
-
 ssize_t migrate_fd_put_buffer(MigrationState *s, const void *data,
                               size_t size)
 {
@@ -320,10 +307,6 @@ ssize_t migrate_fd_put_buffer(MigrationState *s, const void *data,
     if (ret == -1)
         ret = -(s->get_error(s));

-    if (ret == -EAGAIN) {
-        qemu_set_fd_handler2(s->fd, NULL, NULL, migrate_fd_put_notify, s);
-    }
-
     return ret;
 }

@@ -431,7 +414,6 @@ void migrate_fd_wait_for_unfreeze(MigrationState *s)

 int migrate_fd_close(MigrationState *s)
 {
-    qemu_set_fd_handler2(s->fd, NULL, NULL, NULL, NULL);
     return s->close(s);
 }

diff --git a/qemu-file.h b/qemu-file.h
index 31b83f6..af7c36f 100644
--- a/qemu-file.h
+++ b/qemu-file.h
@@ -106,11 +106,6 @@ int64_t qemu_file_get_rate_limit(QEMUFile *f);
 int qemu_file_get_error(QEMUFile *f);
 void qemu_file_set_error(QEMUFile *f, int error);

-/* Try to send any outstanding data.  This function is useful when output is
- * halted due to rate limiting or EAGAIN errors occur as it can be used to
- * resume output. */
-void qemu_file_put_notify(QEMUFile *f);
-
 static inline void qemu_put_be64s(QEMUFile *f, const uint64_t *pv)
 {
     qemu_put_be64(f, *pv);
diff --git a/savevm.c b/savevm.c
index c5fd13f..2c34faa 100644
--- a/savevm.c
+++ b/savevm.c
@@ -546,11 +546,6 @@ int qemu_fclose(QEMUFile *f)
     return ret;
 }

-void qemu_file_put_notify(QEMUFile *f)
-{
-    f->put_buffer(f->opaque, NULL, 0, 0);
-}
-
 void qemu_put_buffer(QEMUFile *f, const uint8_t *buf, int size)
 {
     int l;
-- 
1.7.10.4