discover: Increase udev monitor buffer size

Since we may be enumerating devices after enabling the udev monitor, we
may miss udev events that occur during this process.

This change increases the default udev buffer size.

Signed-off-by: Jeremy Kerr <jk@ozlabs.org>

diff --git a/discover/udev.c b/discover/udev.c
index b1a25b3e639925ee753b53ad4830c9db75e2a7ba..656c5ab7faa3cacb294f329bdea474f50e526c07 100644 (file)
--- a/discover/udev.c
+++ b/discover/udev.c
@@ -26,6 +26,11 @@
 #include "device-handler.h"
 #include "cdrom.h"
 
 #include "device-handler.h"
 #include "cdrom.h"
 

+/* We set a default monitor buffer size, as we may not process monitor
+ * events while performing device discvoery. systemd uses a 128M buffer, so
+ * we'll do the same here */
+static const int monitor_bufsize = 128 * 1024 * 1024;
+

 struct pb_udev {
        struct udev *udev;
        struct udev_monitor *monitor;
 struct pb_udev {
        struct udev *udev;
        struct udev_monitor *monitor;


@@ -355,6 +360,12 @@ static int udev_setup_monitor(struct udev *udev, struct udev_monitor **monitor)
                goto out_err;
        }
 
                goto out_err;
        }
 

+       result = udev_monitor_set_receive_buffer_size(m, monitor_bufsize);
+       if (result) {
+               pb_log("udev_monitor_set_rx_bufsize(%d) failed\n",
+                       monitor_bufsize);
+       }
+

        result = udev_monitor_filter_add_match_subsystem_devtype(m, "block",
                NULL);
 
        result = udev_monitor_filter_add_match_subsystem_devtype(m, "block",
                NULL);