worker: simplify RedCompressBuf

Make sure an allocated buffer is correctly referenced by the marshaller,
and can't be free and reused by mistake. Simplify the code by using
GSlice

2 files changed, 25 insertions, 89 deletions

diff --git a/server/display-channel.h b/server/display-channel.h
index a1e59470..b0af1386 100644
--- a/server/display-channel.h
+++ b/server/display-channel.h
@@ -81,7 +81,6 @@ struct RedCompressBuf {
         uint8_t  bytes[RED_COMPRESS_BUF_SIZE];
         uint32_t words[RED_COMPRESS_BUF_SIZE / 4];
     } buf;
-    RedCompressBuf *next;
     RedCompressBuf *send_next;
 };
 
@@ -192,8 +191,6 @@ struct DisplayChannelClient {
         uint32_t stream_outbuf_size;
         uint8_t *stream_outbuf; // caution stream buffer is also used as compress bufs!!!
 
-        RedCompressBuf *used_compress_bufs;
-
         FreeList free_list;
         uint64_t pixmap_cache_items[MAX_DRAWABLE_PIXMAP_CACHE_ITEMS];
         int num_pixmap_cache_items;
diff --git a/server/red_worker.c b/server/red_worker.c
index 5b14836e..8e3be511 100644
--- a/server/red_worker.c
+++ b/server/red_worker.c
@@ -2175,16 +2175,27 @@ static void red_push_surface_image(DisplayChannelClient *dcc, int surface_id)
     red_channel_client_push(RED_CHANNEL_CLIENT(dcc));
 }
 
+static RedCompressBuf *compress_buf_new(void)
+{
+    return g_slice_new(RedCompressBuf);
+}
+
+static void compress_buf_free(RedCompressBuf *buf)
+{
+    g_slice_free(RedCompressBuf, buf);
+}
+
 static void marshaller_add_compressed(SpiceMarshaller *m,
                                       RedCompressBuf *comp_buf, size_t size)
 {
     size_t max = size;
     size_t now;
     do {
-        spice_assert(comp_buf);
+        spice_return_if_fail(comp_buf);
         now = MIN(sizeof(comp_buf->buf), max);
         max -= now;
-        spice_marshaller_add_ref(m, comp_buf->buf.bytes, now);
+        spice_marshaller_add_ref_full(m, comp_buf->buf.bytes, now,
+                                      (spice_marshaller_item_free_func)compress_buf_free, NULL);
         comp_buf = comp_buf->send_next;
     } while (max);
 }
@@ -2219,66 +2230,6 @@ static inline void fill_palette(DisplayChannelClient *dcc,
     }
 }
 
-static inline RedCompressBuf *red_display_alloc_compress_buf(DisplayChannelClient *dcc)
-{
-    DisplayChannel *display_channel = DCC_TO_DC(dcc);
-    RedCompressBuf *ret;
-
-    if (display_channel->free_compress_bufs) {
-        ret = display_channel->free_compress_bufs;
-        display_channel->free_compress_bufs = ret->next;
-    } else {
-        ret = spice_new(RedCompressBuf, 1);
-    }
-
-    ret->next = dcc->send_data.used_compress_bufs;
-    dcc->send_data.used_compress_bufs = ret;
-    return ret;
-}
-
-static inline void __red_display_free_compress_buf(DisplayChannel *dc,
-                                                   RedCompressBuf *buf)
-{
-    buf->next = dc->free_compress_bufs;
-    dc->free_compress_bufs = buf;
-}
-
-static void red_display_free_compress_buf(DisplayChannelClient *dcc,
-                                          RedCompressBuf *buf)
-{
-    DisplayChannel *display_channel = DCC_TO_DC(dcc);
-    RedCompressBuf **curr_used = &dcc->send_data.used_compress_bufs;
-
-    for (;;) {
-        spice_assert(*curr_used);
-        if (*curr_used == buf) {
-            *curr_used = buf->next;
-            break;
-        }
-        curr_used = &(*curr_used)->next;
-    }
-    __red_display_free_compress_buf(display_channel, buf);
-}
-
-static void red_display_reset_compress_buf(DisplayChannelClient *dcc)
-{
-    while (dcc->send_data.used_compress_bufs) {
-        RedCompressBuf *buf = dcc->send_data.used_compress_bufs;
-        dcc->send_data.used_compress_bufs = buf->next;
-        __red_display_free_compress_buf(DCC_TO_DC(dcc), buf);
-    }
-}
-
-static void red_display_destroy_compress_bufs(DisplayChannel *display_channel)
-{
-    spice_assert(!red_channel_is_connected(RED_CHANNEL(display_channel)));
-    while (display_channel->free_compress_bufs) {
-        RedCompressBuf *buf = display_channel->free_compress_bufs;
-        display_channel->free_compress_bufs = buf->next;
-        free(buf);
-    }
-}
-
 /******************************************************
  *      Global lz red drawables routines
 *******************************************************/
@@ -2606,9 +2557,7 @@ static int encoder_usr_more_space(EncoderData *enc_data, uint8_t **io_ptr)
 {
     RedCompressBuf *buf;
 
-    if (!(buf = red_display_alloc_compress_buf(enc_data->dcc))) {
-        return 0;
-    }
+    buf = compress_buf_new();
     enc_data->bufs_tail->send_next = buf;
     enc_data->bufs_tail = buf;
     buf->send_next = NULL;
@@ -2868,7 +2817,7 @@ static inline int red_glz_compress_image(DisplayChannelClient *dcc,
     int glz_size;
     int zlib_size;
 
-    glz_data->data.bufs_tail = red_display_alloc_compress_buf(dcc);
+    glz_data->data.bufs_tail = compress_buf_new();
     glz_data->data.bufs_head = glz_data->data.bufs_tail;
 
     if (!glz_data->data.bufs_head) {
@@ -2904,7 +2853,7 @@ static inline int red_glz_compress_image(DisplayChannelClient *dcc,
 #endif
     zlib_data = &worker->zlib_data;
 
-    zlib_data->data.bufs_tail = red_display_alloc_compress_buf(dcc);
+    zlib_data->data.bufs_tail = compress_buf_new();
     zlib_data->data.bufs_head = zlib_data->data.bufs_tail;
 
     if (!zlib_data->data.bufs_head) {
@@ -2927,7 +2876,7 @@ static inline int red_glz_compress_image(DisplayChannelClient *dcc,
         while (zlib_data->data.bufs_head) {
             RedCompressBuf *buf = zlib_data->data.bufs_head;
             zlib_data->data.bufs_head = buf->send_next;
-            red_display_free_compress_buf(dcc, buf);
+            compress_buf_free(buf);
         }
         goto glz;
     }
@@ -2966,7 +2915,7 @@ static inline int red_lz_compress_image(DisplayChannelClient *dcc,
     stat_time_t start_time = stat_now(DCC_TO_DC(dcc)->lz_stat.clock);
 #endif
 
-    lz_data->data.bufs_tail = red_display_alloc_compress_buf(dcc);
+    lz_data->data.bufs_tail = compress_buf_new();
     lz_data->data.bufs_head = lz_data->data.bufs_tail;
 
     if (!lz_data->data.bufs_head) {
@@ -2980,7 +2929,7 @@ static inline int red_lz_compress_image(DisplayChannelClient *dcc,
         while (lz_data->data.bufs_head) {
             RedCompressBuf *buf = lz_data->data.bufs_head;
             lz_data->data.bufs_head = buf->send_next;
-            red_display_free_compress_buf(dcc, buf);
+            compress_buf_free(buf);
         }
         return FALSE;
     }
@@ -3069,7 +3018,7 @@ static int red_jpeg_compress_image(DisplayChannelClient *dcc, SpiceImage *dest,
         return FALSE;
     }
 
-    jpeg_data->data.bufs_tail = red_display_alloc_compress_buf(dcc);
+    jpeg_data->data.bufs_tail = compress_buf_new();
     jpeg_data->data.bufs_head = jpeg_data->data.bufs_tail;
 
     if (!jpeg_data->data.bufs_head) {
@@ -3084,7 +3033,7 @@ static int red_jpeg_compress_image(DisplayChannelClient *dcc, SpiceImage *dest,
         while (jpeg_data->data.bufs_head) {
             RedCompressBuf *buf = jpeg_data->data.bufs_head;
             jpeg_data->data.bufs_head = buf->send_next;
-            red_display_free_compress_buf(dcc, buf);
+            compress_buf_free(buf);
         }
         return FALSE;
     }
@@ -3186,7 +3135,7 @@ static int red_lz4_compress_image(DisplayChannelClient *dcc, SpiceImage *dest,
     stat_time_t start_time = stat_now(worker->clockid);
 #endif
 
-    lz4_data->data.bufs_tail = red_display_alloc_compress_buf(dcc);
+    lz4_data->data.bufs_tail = compress_buf_new();
     lz4_data->data.bufs_head = lz4_data->data.bufs_tail;
 
     if (!lz4_data->data.bufs_head) {
@@ -3201,7 +3150,7 @@ static int red_lz4_compress_image(DisplayChannelClient *dcc, SpiceImage *dest,
         while (lz4_data->data.bufs_head) {
             RedCompressBuf *buf = lz4_data->data.bufs_head;
             lz4_data->data.bufs_head = buf->send_next;
-            red_display_free_compress_buf(dcc, buf);
+            compress_buf_free(buf);
         }
         return FALSE;
     }
@@ -3269,13 +3218,8 @@ static inline int red_quic_compress_image(DisplayChannelClient *dcc, SpiceImage
         return FALSE;
     }
 
-    quic_data->data.bufs_tail = red_display_alloc_compress_buf(dcc);
+    quic_data->data.bufs_tail = compress_buf_new();
     quic_data->data.bufs_head = quic_data->data.bufs_tail;
-
-    if (!quic_data->data.bufs_head) {
-        return FALSE;
-    }
-
     quic_data->data.bufs_head->send_next = NULL;
     quic_data->data.dcc = dcc;
 
@@ -3283,7 +3227,7 @@ static inline int red_quic_compress_image(DisplayChannelClient *dcc, SpiceImage
         while (quic_data->data.bufs_head) {
             RedCompressBuf *buf = quic_data->data.bufs_head;
             quic_data->data.bufs_head = buf->send_next;
-            red_display_free_compress_buf(dcc, buf);
+            compress_buf_free(buf);
         }
         return FALSE;
     }
@@ -3763,7 +3707,6 @@ static void fill_attr(SpiceMarshaller *m, SpiceLineAttr *attr, uint32_t group_id
 
 static inline void red_display_reset_send_data(DisplayChannelClient *dcc)
 {
-    red_display_reset_compress_buf(dcc);
     dcc->send_data.free_list.res->count = 0;
     dcc->send_data.num_pixmap_cache_items = 0;
     memset(dcc->send_data.free_list.sync, 0, sizeof(dcc->send_data.free_list.sync));
@@ -5990,14 +5933,10 @@ static void display_channel_client_on_disconnect(RedChannelClient *rcc)
     red_release_glz(dcc);
     red_reset_palette_cache(dcc);
     free(dcc->send_data.stream_outbuf);
-    red_display_reset_compress_buf(dcc);
     free(dcc->send_data.free_list.res);
     dcc_destroy_stream_agents(dcc);
 
     // this was the last channel client
-    if (!red_channel_is_connected(rcc->channel)) {
-        red_display_destroy_compress_bufs(display);
-    }
     spice_debug("#draw=%d, #red_draw=%d, #glz_draw=%d",
                 display->drawable_count, worker->red_drawable_count,
                 worker->glz_drawable_count);