[Qemu-devel] [PATCH 2/9] migration: consolidate QEMUFile methods in a single QEMUFileOps struct

[Paolo Bonzini]

Signed-off-by: Paolo Bonzini <address@hidden>
---
 buffered_file.c |  13 ++++---
 qemu-file.h     |  16 +++++----
 savevm.c        | 108 +++++++++++++++++++++++++++++++-------------------------
 3 file modificati, 79 inserzioni(+), 58 rimozioni(-)

diff --git a/buffered_file.c b/buffered_file.c
index 318d0f0..535cdf5 100644
--- a/buffered_file.c
+++ b/buffered_file.c
@@ -233,6 +233,14 @@ static void buffered_rate_tick(void *opaque)
     buffered_put_buffer(s, NULL, 0, 0);
 }
 
+static const QEMUFileOps buffered_file_ops = {
+    .put_buffer =     buffered_put_buffer,
+    .close =          buffered_close,
+    .rate_limit =     buffered_rate_limit,
+    .get_rate_limit = buffered_get_rate_limit,
+    .set_rate_limit = buffered_set_rate_limit,
+};
+
 QEMUFile *qemu_fopen_ops_buffered(MigrationState *migration_state)
 {
     QEMUFileBuffered *s;
@@ -242,10 +250,7 @@ QEMUFile *qemu_fopen_ops_buffered(MigrationState 
*migration_state)
     s->migration_state = migration_state;
     s->xfer_limit = migration_state->bandwidth_limit / 10;
 
-    s->file = qemu_fopen_ops(s, buffered_put_buffer, NULL,
-                             buffered_close, buffered_rate_limit,
-                             buffered_set_rate_limit,
-                            buffered_get_rate_limit);
+    s->file = qemu_fopen_ops(s, &buffered_file_ops);
 
     s->timer = qemu_new_timer_ms(rt_clock, buffered_rate_tick, s);
 
diff --git a/qemu-file.h b/qemu-file.h
index 9c8985b..c89e8e0 100644
--- a/qemu-file.h
+++ b/qemu-file.h
@@ -59,12 +59,16 @@ typedef int (QEMUFileRateLimit)(void *opaque);
 typedef int64_t (QEMUFileSetRateLimit)(void *opaque, int64_t new_rate);
 typedef int64_t (QEMUFileGetRateLimit)(void *opaque);
 
-QEMUFile *qemu_fopen_ops(void *opaque, QEMUFilePutBufferFunc *put_buffer,
-                         QEMUFileGetBufferFunc *get_buffer,
-                         QEMUFileCloseFunc *close,
-                         QEMUFileRateLimit *rate_limit,
-                         QEMUFileSetRateLimit *set_rate_limit,
-                         QEMUFileGetRateLimit *get_rate_limit);
+typedef struct QEMUFileOps {
+    QEMUFilePutBufferFunc *put_buffer;
+    QEMUFileGetBufferFunc *get_buffer;
+    QEMUFileCloseFunc *close;
+    QEMUFileRateLimit *rate_limit;
+    QEMUFileSetRateLimit *set_rate_limit;
+    QEMUFileGetRateLimit *get_rate_limit;
+} QEMUFileOps;
+
+QEMUFile *qemu_fopen_ops(void *opaque, const QEMUFileOps *ops);
 QEMUFile *qemu_fopen(const char *filename, const char *mode);
 QEMUFile *qemu_fdopen(int fd, const char *mode);
 QEMUFile *qemu_fopen_socket(int fd);
diff --git a/savevm.c b/savevm.c
index 5cd4432..0751422 100644
--- a/savevm.c
+++ b/savevm.c
@@ -162,12 +162,7 @@ void qemu_announce_self(void)
 #define IO_BUF_SIZE 32768
 
 struct QEMUFile {
-    QEMUFilePutBufferFunc *put_buffer;
-    QEMUFileGetBufferFunc *get_buffer;
-    QEMUFileCloseFunc *close;
-    QEMUFileRateLimit *rate_limit;
-    QEMUFileSetRateLimit *set_rate_limit;
-    QEMUFileGetRateLimit *get_rate_limit;
+    const QEMUFileOps *ops;
     void *opaque;
     int is_write;
 
@@ -256,6 +251,16 @@ static int stdio_fclose(void *opaque)
     return ret;
 }
 
+static const QEMUFileOps stdio_pipe_read_ops = {
+    .get_buffer = stdio_get_buffer,
+    .close =      stdio_pclose
+};
+
+static const QEMUFileOps stdio_pipe_write_ops = {
+    .put_buffer = stdio_put_buffer,
+    .close =      stdio_pclose
+};
+
 QEMUFile *qemu_popen(FILE *stdio_file, const char *mode)
 {
     QEMUFileStdio *s;
@@ -270,11 +275,9 @@ QEMUFile *qemu_popen(FILE *stdio_file, const char *mode)
     s->stdio_file = stdio_file;
 
     if(mode[0] == 'r') {
-        s->file = qemu_fopen_ops(s, NULL, stdio_get_buffer, stdio_pclose, 
-                                NULL, NULL, NULL);
+        s->file = qemu_fopen_ops(s, &stdio_pipe_read_ops);
     } else {
-        s->file = qemu_fopen_ops(s, stdio_put_buffer, NULL, stdio_pclose, 
-                                NULL, NULL, NULL);
+        s->file = qemu_fopen_ops(s, &stdio_pipe_write_ops);
     }
     return s->file;
 }
@@ -302,6 +305,16 @@ int qemu_stdio_fd(QEMUFile *f)
     return fd;
 }
 
+static const QEMUFileOps stdio_file_read_ops = {
+    .get_buffer = stdio_get_buffer,
+    .close =      stdio_fclose
+};
+
+static const QEMUFileOps stdio_file_write_ops = {
+    .put_buffer = stdio_put_buffer,
+    .close =      stdio_fclose
+};
+
 QEMUFile *qemu_fdopen(int fd, const char *mode)
 {
     QEMUFileStdio *s;
@@ -319,11 +332,9 @@ QEMUFile *qemu_fdopen(int fd, const char *mode)
         goto fail;
 
     if(mode[0] == 'r') {
-        s->file = qemu_fopen_ops(s, NULL, stdio_get_buffer, stdio_fclose, 
-                                NULL, NULL, NULL);
+        s->file = qemu_fopen_ops(s, &stdio_file_read_ops);
     } else {
-        s->file = qemu_fopen_ops(s, stdio_put_buffer, NULL, stdio_fclose, 
-                                NULL, NULL, NULL);
+        s->file = qemu_fopen_ops(s, &stdio_file_write_ops);
     }
     return s->file;
 
@@ -332,13 +343,17 @@ fail:
     return NULL;
 }
 
+static const QEMUFileOps socket_read_ops = {
+    .get_buffer = socket_get_buffer,
+    .close =      socket_close
+};
+
 QEMUFile *qemu_fopen_socket(int fd)
 {
     QEMUFileSocket *s = g_malloc0(sizeof(QEMUFileSocket));
 
     s->fd = fd;
-    s->file = qemu_fopen_ops(s, NULL, socket_get_buffer, socket_close, 
-                            NULL, NULL, NULL);
+    s->file = qemu_fopen_ops(s, &socket_read_ops);
     return s->file;
 }
 
@@ -360,11 +375,9 @@ QEMUFile *qemu_fopen(const char *filename, const char 
*mode)
         goto fail;
     
     if(mode[0] == 'w') {
-        s->file = qemu_fopen_ops(s, stdio_put_buffer, NULL, stdio_fclose,
-                                NULL, NULL, NULL);
+        s->file = qemu_fopen_ops(s, &stdio_file_write_ops);
     } else {
-        s->file = qemu_fopen_ops(s, NULL, stdio_get_buffer, stdio_fclose,
-                              NULL, NULL, NULL);
+        s->file = qemu_fopen_ops(s, &stdio_file_read_ops);
     }
     return s->file;
 fail:
@@ -389,32 +402,31 @@ static int bdrv_fclose(void *opaque)
     return bdrv_flush(opaque);
 }
 
+static const QEMUFileOps bdrv_read_ops = {
+    .get_buffer = block_get_buffer,
+    .close =      bdrv_fclose
+};
+
+static const QEMUFileOps bdrv_write_ops = {
+    .put_buffer = block_put_buffer,
+    .close =      bdrv_fclose
+};
+
 static QEMUFile *qemu_fopen_bdrv(BlockDriverState *bs, int is_writable)
 {
     if (is_writable)
-        return qemu_fopen_ops(bs, block_put_buffer, NULL, bdrv_fclose, 
-                             NULL, NULL, NULL);
-    return qemu_fopen_ops(bs, NULL, block_get_buffer, bdrv_fclose, NULL, NULL, 
NULL);
+        return qemu_fopen_ops(bs, &bdrv_write_ops);
+    return qemu_fopen_ops(bs, &bdrv_read_ops);
 }
 
-QEMUFile *qemu_fopen_ops(void *opaque, QEMUFilePutBufferFunc *put_buffer,
-                         QEMUFileGetBufferFunc *get_buffer,
-                         QEMUFileCloseFunc *close,
-                         QEMUFileRateLimit *rate_limit,
-                         QEMUFileSetRateLimit *set_rate_limit,
-                         QEMUFileGetRateLimit *get_rate_limit)
+QEMUFile *qemu_fopen_ops(void *opaque, const QEMUFileOps *ops)
 {
     QEMUFile *f;
 
     f = g_malloc0(sizeof(QEMUFile));
 
     f->opaque = opaque;
-    f->put_buffer = put_buffer;
-    f->get_buffer = get_buffer;
-    f->close = close;
-    f->rate_limit = rate_limit;
-    f->set_rate_limit = set_rate_limit;
-    f->get_rate_limit = get_rate_limit;
+    f->ops = ops;
     f->is_write = 0;
 
     return f;
@@ -437,11 +449,11 @@ static int qemu_fflush(QEMUFile *f)
 {
     int ret = 0;
 
-    if (!f->put_buffer)
+    if (!f->ops->put_buffer)
         return 0;
 
     if (f->is_write && f->buf_index > 0) {
-        ret = f->put_buffer(f->opaque, f->buf, f->buf_offset, f->buf_index);
+        ret = f->ops->put_buffer(f->opaque, f->buf, f->buf_offset, 
f->buf_index);
         if (ret >= 0) {
             f->buf_offset += f->buf_index;
         }
@@ -455,7 +467,7 @@ static void qemu_fill_buffer(QEMUFile *f)
     int len;
     int pending;
 
-    if (!f->get_buffer)
+    if (!f->ops->get_buffer)
         return;
 
     if (f->is_write)
@@ -468,7 +480,7 @@ static void qemu_fill_buffer(QEMUFile *f)
     f->buf_index = 0;
     f->buf_size = pending;
 
-    len = f->get_buffer(f->opaque, f->buf + pending, f->buf_offset,
+    len = f->ops->get_buffer(f->opaque, f->buf + pending, f->buf_offset,
                         IO_BUF_SIZE - pending);
     if (len > 0) {
         f->buf_size += len;
@@ -492,8 +504,8 @@ int qemu_fclose(QEMUFile *f)
     int ret;
     ret = qemu_fflush(f);
 
-    if (f->close) {
-        int ret2 = f->close(f->opaque);
+    if (f->ops->close) {
+        int ret2 = f->ops->close(f->opaque);
         if (ret >= 0) {
             ret = ret2;
         }
@@ -510,7 +522,7 @@ int qemu_fclose(QEMUFile *f)
 
 int qemu_file_put_notify(QEMUFile *f)
 {
-    return f->put_buffer(f->opaque, NULL, 0, 0);
+    return f->ops->put_buffer(f->opaque, NULL, 0, 0);
 }
 
 void qemu_put_buffer(QEMUFile *f, const uint8_t *buf, int size)
@@ -657,16 +669,16 @@ static int64_t qemu_ftell(QEMUFile *f)
 
 int qemu_file_rate_limit(QEMUFile *f)
 {
-    if (f->rate_limit)
-        return f->rate_limit(f->opaque);
+    if (f->ops->rate_limit)
+        return f->ops->rate_limit(f->opaque);
 
     return 0;
 }
 
 int64_t qemu_file_get_rate_limit(QEMUFile *f)
 {
-    if (f->get_rate_limit)
-        return f->get_rate_limit(f->opaque);
+    if (f->ops->get_rate_limit)
+        return f->ops->get_rate_limit(f->opaque);
 
     return 0;
 }
@@ -675,8 +687,8 @@ int64_t qemu_file_set_rate_limit(QEMUFile *f, int64_t 
new_rate)
 {
     /* any failed or completed migration keeps its state to allow probing of
      * migration data, but has no associated file anymore */
-    if (f && f->set_rate_limit)
-        return f->set_rate_limit(f->opaque, new_rate);
+    if (f && f->ops->set_rate_limit)
+        return f->ops->set_rate_limit(f->opaque, new_rate);
 
     return 0;
 }
-- 
1.7.12