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From 8d5c90a1f4bbe548a1ae361f8d69970669d6e72e Mon Sep 17 00:00:00 2001
From: Tomas Bzatek <tbzatek@redhat.com>
Date: Fri, 13 Nov 2020 16:52:11 +0100
Subject: [PATCH 1/2] udisksdaemonutil: Refactor
udisks_daemon_util_trigger_uevent() out of UDisksLinuxBlockObject
This decouples uevent triggering from UDisksLinuxBlockObject as sometimes
we don't have a block object yet or it's outdated.
---
doc/udisks2-sections.txt.daemon.sections.in | 2 +
src/udisksdaemonutil.c | 230 ++++++++++++++++++++
src/udisksdaemonutil.h | 7 +
src/udiskslinuxblockobject.c | 180 ++-------------
4 files changed, 253 insertions(+), 166 deletions(-)
diff --git a/doc/udisks2-sections.txt.daemon.sections.in b/doc/udisks2-sections.txt.daemon.sections.in
index 26c3c2cd..3030fa95 100644
--- a/doc/udisks2-sections.txt.daemon.sections.in
+++ b/doc/udisks2-sections.txt.daemon.sections.in
@@ -307,6 +307,8 @@ udisks_daemon_util_file_set_contents
udisks_daemon_util_on_user_seat
udisks_daemon_util_get_free_mdraid_device
udisks_ata_identify_get_word
+udisks_daemon_util_trigger_uevent
+udisks_daemon_util_trigger_uevent_sync
</SECTION>
<SECTION>
diff --git a/src/udisksdaemonutil.c b/src/udisksdaemonutil.c
index 75b877a0..d16c0766 100644
--- a/src/udisksdaemonutil.c
+++ b/src/udisksdaemonutil.c
@@ -34,10 +34,14 @@
#include <limits.h>
#include <stdlib.h>
+#include <blockdev/blockdev.h>
+
#include "udisksdaemon.h"
#include "udisksdaemonutil.h"
#include "udisksstate.h"
#include "udiskslogging.h"
+#include "udiskslinuxdevice.h"
+#include "udiskslinuxprovider.h"
#include "udiskslinuxblockobject.h"
#include "udiskslinuxdriveobject.h"
@@ -1626,3 +1630,229 @@ udisks_ata_identify_get_word (const guchar *identify_data, guint word_number)
out:
return ret;
}
+
+
+/* ---------------------------------------------------------------------------------------------------- */
+
+static volatile guint uevent_serial = 0;
+
+static gboolean
+trigger_uevent (const gchar *path, const gchar *str)
+{
+ gint fd;
+
+ fd = open (path, O_WRONLY);
+ if (fd < 0)
+ {
+ udisks_warning ("Error opening %s while triggering uevent: %m", path);
+ return FALSE;
+ }
+
+ if (write (fd, str, strlen (str)) != (ssize_t) strlen (str))
+ {
+ udisks_warning ("Error writing '%s' to file %s: %m", str, path);
+ close (fd);
+ return FALSE;
+ }
+
+ close (fd);
+ return TRUE;
+}
+
+typedef struct
+{
+ UDisksDaemon *daemon;
+ GMainLoop *main_loop;
+ guint serial;
+ gchar *uevent_path;
+ gboolean success;
+} SynthUeventData;
+
+static gboolean
+trigger_uevent_idle_cb (gpointer user_data)
+{
+ SynthUeventData *data = user_data;
+ gchar *str;
+
+ str = g_strdup_printf ("change %s UDISKSSERIAL=%u", udisks_daemon_get_uuid (data->daemon), data->serial);
+
+ if (! trigger_uevent (data->uevent_path, str))
+ {
+ /* kernel refused our string, try simple "change" but don't wait for it */
+ trigger_uevent (data->uevent_path, "change");
+ data->success = FALSE;
+ g_main_loop_quit (data->main_loop);
+ }
+ g_free (str);
+
+ /* remove the source */
+ return FALSE;
+}
+
+static gboolean
+uevent_wait_timeout_cb (gpointer user_data)
+{
+ SynthUeventData *data = user_data;
+
+ data->success = FALSE;
+ g_main_loop_quit (data->main_loop);
+
+ /* remove the source */
+ return FALSE;
+}
+
+static void
+uevent_probed_cb (UDisksLinuxProvider *provider,
+ const gchar *action,
+ UDisksLinuxDevice *device,
+ gpointer user_data)
+{
+ SynthUeventData *data = user_data;
+ const gchar *received_serial_str;
+ gint64 received_serial;
+ gchar *endptr;
+
+ received_serial_str = g_udev_device_get_property (device->udev_device, "SYNTH_ARG_UDISKSSERIAL");
+ if (received_serial_str != NULL)
+ {
+ endptr = (gchar *) received_serial_str;
+ received_serial = g_ascii_strtoll (received_serial_str, &endptr, 0);
+ if (endptr != received_serial_str && received_serial == data->serial)
+ {
+ data->success = TRUE;
+ g_main_loop_quit (data->main_loop);
+ }
+ }
+}
+
+/**
+ * udisks_daemon_util_trigger_uevent:
+ * @daemon: A #UDisksDaemon.
+ * @device_path: Block device path.
+ *
+ * Triggers a 'change' uevent in the kernel.
+ *
+ * The triggered event will bubble up from the kernel through the udev
+ * stack and will eventually be received by the udisks daemon process
+ * itself. This method does not wait for the event to be received.
+ */
+void
+udisks_daemon_util_trigger_uevent (UDisksDaemon *daemon,
+ const gchar *device_path)
+{
+ GUdevClient *gudev_client;
+ GUdevDevice *gudev_device;
+ gchar *path;
+
+ g_return_if_fail (UDISKS_IS_DAEMON (daemon));
+ g_return_if_fail (device_path != NULL);
+
+ gudev_client = udisks_linux_provider_get_udev_client (udisks_daemon_get_linux_provider (daemon));
+ gudev_device = g_udev_client_query_by_device_file (gudev_client, device_path);
+ if (gudev_device == NULL)
+ {
+ udisks_critical ("Device %s not found in udev database, skipping uevent trigger", device_path);
+ return;
+ }
+
+ path = g_build_filename (g_udev_device_get_sysfs_path (gudev_device), "uevent", NULL);
+ trigger_uevent (path, "change");
+ g_free (path);
+
+ g_object_unref (gudev_device);
+}
+
+/**
+ * udisks_daemon_util_trigger_uevent_sync:
+ * @daemon: A #UDisksDaemon.
+ * @device_path: Block device path.
+ * @timeout_seconds: Maximum time to wait for the uevent (in seconds).
+ *
+ * Triggers a 'change' uevent in the kernel and waits until it's received and
+ * processed by udisks.
+ *
+ * Unlike udisks_daemon_util_trigger_uevent() that just triggers
+ * a synthetic uevent to the kernel, this call will actually block and wait until
+ * the #UDisksLinuxProvider receives the uevent, performs probing and processes
+ * the uevent further down the UDisks object stack. Upon returning from this
+ * function call the caller may assume the event has been fully processed, all
+ * D-Bus objects are updated and settled. Typically used in busy wait for
+ * a particular D-Bus interface.
+ *
+ * Note that this uses synthetic uevent tagging and only works on linux kernel
+ * 4.13 and higher. In case an older kernel is detected this acts like the classic
+ * udisks_daemon_util_trigger_uevent() call and %FALSE is returned.
+ *
+ * Returns: %TRUE if the uevent has been successfully received, %FALSE otherwise
+ * or when the kernel version is too old.
+ */
+gboolean
+udisks_daemon_util_trigger_uevent_sync (UDisksDaemon *daemon,
+ const gchar *device_path,
+ guint timeout_seconds)
+{
+ UDisksLinuxProvider *provider;
+ GUdevClient *gudev_client;
+ GUdevDevice *gudev_device;
+ SynthUeventData data;
+ GMainContext *main_context;
+ GSource *idle_source;
+ GSource *timeout_source;
+
+ g_return_val_if_fail (UDISKS_IS_DAEMON (daemon), FALSE);
+ g_return_val_if_fail (device_path != NULL, FALSE);
+
+ if (bd_utils_check_linux_version (4, 13, 0) < 0)
+ {
+ udisks_daemon_util_trigger_uevent (daemon, device_path);
+ return FALSE;
+ }
+
+ provider = udisks_daemon_get_linux_provider (daemon);
+ gudev_client = udisks_linux_provider_get_udev_client (provider);
+ gudev_device = g_udev_client_query_by_device_file (gudev_client, device_path);
+ if (gudev_device == NULL)
+ {
+ udisks_critical ("Device %s not found in udev database, skipping uevent trigger", device_path);
+ return FALSE;
+ }
+
+ data.daemon = daemon;
+ data.uevent_path = g_build_filename (g_udev_device_get_sysfs_path (gudev_device), "uevent", NULL);
+ data.serial = g_atomic_int_add (&uevent_serial, 1);
+
+ main_context = g_main_context_new ();
+ g_main_context_push_thread_default (main_context);
+ data.main_loop = g_main_loop_new (main_context, FALSE);
+
+ /* queue the actual trigger in the loop */
+ idle_source = g_idle_source_new ();
+ g_source_set_callback (idle_source, (GSourceFunc) trigger_uevent_idle_cb, &data, NULL);
+ g_source_attach (idle_source, main_context);
+ g_source_unref (idle_source);
+
+ /* add timeout as a fallback */
+ timeout_source = g_timeout_source_new_seconds (timeout_seconds);
+ g_source_set_callback (timeout_source, (GSourceFunc) uevent_wait_timeout_cb, &data, NULL);
+ g_source_attach (timeout_source, main_context);
+ g_source_unref (timeout_source);
+
+ /* catch incoming uevents */
+ g_signal_connect (provider, "uevent-probed", G_CALLBACK (uevent_probed_cb), &data);
+
+ data.success = FALSE;
+ g_main_loop_run (data.main_loop);
+
+ g_signal_handlers_disconnect_by_func (provider, uevent_probed_cb, &data);
+ g_main_context_pop_thread_default (main_context);
+
+ g_main_loop_unref (data.main_loop);
+ g_main_context_unref (main_context);
+
+ g_free (data.uevent_path);
+ g_object_unref (gudev_device);
+
+ return data.success;
+}
+
+/* ---------------------------------------------------------------------------------------------------- */
diff --git a/src/udisksdaemonutil.h b/src/udisksdaemonutil.h
index 4fe36214..2edf2122 100644
--- a/src/udisksdaemonutil.h
+++ b/src/udisksdaemonutil.h
@@ -51,6 +51,13 @@ guint64 udisks_daemon_util_block_get_size (GUdevDevice *device,
gboolean *out_media_available,
gboolean *out_media_change_detected);
+void udisks_daemon_util_trigger_uevent (UDisksDaemon *daemon,
+ const gchar *device_path);
+
+gboolean udisks_daemon_util_trigger_uevent_sync (UDisksDaemon *daemon,
+ const gchar *device_path,
+ guint timeout_seconds);
+
gchar *udisks_daemon_util_resolve_link (const gchar *path,
const gchar *name);
diff --git a/src/udiskslinuxblockobject.c b/src/udiskslinuxblockobject.c
index 42ab17d7..5a68c84b 100644
--- a/src/udiskslinuxblockobject.c
+++ b/src/udiskslinuxblockobject.c
@@ -38,8 +38,6 @@
#include <stdlib.h>
#include <glib/gstdio.h>
-#include <blockdev/blockdev.h>
-
#include "udiskslogging.h"
#include "udisksdaemon.h"
#include "udisksdaemonutil.h"
@@ -959,122 +957,24 @@ on_mount_monitor_mount_removed (UDisksMountMonitor *monitor,
/* ---------------------------------------------------------------------------------------------------- */
-static volatile guint uevent_serial = 0;
-
-static gboolean
-trigger_uevent (const gchar *path, const gchar *str)
-{
- gint fd;
-
- fd = open (path, O_WRONLY);
- if (fd < 0)
- {
- udisks_warning ("Error opening %s while triggering uevent: %m", path);
- return FALSE;
- }
-
- if (write (fd, str, strlen (str)) != (ssize_t) strlen (str))
- {
- udisks_warning ("Error writing '%s' to file %s: %m", str, path);
- close (fd);
- return FALSE;
- }
-
- close (fd);
- return TRUE;
-}
-
-typedef struct
-{
- UDisksLinuxBlockObject *object;
- GMainLoop *main_loop;
- guint serial;
- gchar *uevent_path;
- gboolean success;
-} SynthUeventData;
-
-static gboolean
-trigger_uevent_idle_cb (gpointer user_data)
-{
- SynthUeventData *data = user_data;
- gchar *str;
-
- str = g_strdup_printf ("change %s UDISKSSERIAL=%u", udisks_daemon_get_uuid (data->object->daemon), data->serial);
-
- if (! trigger_uevent (data->uevent_path, str))
- {
- /* kernel refused our string, try simple "change" but don't wait for it */
- trigger_uevent (data->uevent_path, "change");
- data->success = FALSE;
- g_main_loop_quit (data->main_loop);
- }
- g_free (str);
-
- /* remove the source */
- return FALSE;
-}
-
-static gboolean
-uevent_wait_timeout_cb (gpointer user_data)
-{
- SynthUeventData *data = user_data;
-
- data->success = FALSE;
- g_main_loop_quit (data->main_loop);
-
- /* remove the source */
- return FALSE;
-}
-
-static void
-uevent_probed_cb (UDisksLinuxProvider *provider,
- const gchar *action,
- UDisksLinuxDevice *device,
- gpointer user_data)
-{
- SynthUeventData *data = user_data;
- const gchar *received_serial_str;
- gint64 received_serial;
- gchar *endptr;
-
- received_serial_str = g_udev_device_get_property (device->udev_device, "SYNTH_ARG_UDISKSSERIAL");
- if (received_serial_str != NULL)
- {
- endptr = (gchar *) received_serial_str;
- received_serial = g_ascii_strtoll (received_serial_str, &endptr, 0);
- if (endptr != received_serial_str && received_serial == data->serial)
- {
- data->success = TRUE;
- g_main_loop_quit (data->main_loop);
- }
- }
-}
-
/**
* udisks_linux_block_object_trigger_uevent:
* @object: A #UDisksLinuxBlockObject.
*
* Triggers a 'change' uevent in the kernel.
*
- * The triggered event will bubble up from the kernel through the udev
- * stack and will eventually be received by the udisks daemon process
- * itself. This method does not wait for the event to be received.
+ * Refer to udisks_daemon_util_trigger_uevent() for detailed description.
*/
void
udisks_linux_block_object_trigger_uevent (UDisksLinuxBlockObject *object)
{
- UDisksLinuxDevice *device;
- gchar *path;
+ gchar *device_file;
g_return_if_fail (UDISKS_IS_LINUX_BLOCK_OBJECT (object));
- device = udisks_linux_block_object_get_device (object);
- path = g_strconcat (g_udev_device_get_sysfs_path (device->udev_device), "/uevent", NULL);
-
- trigger_uevent (path, "change");
-
- g_free (path);
- g_object_unref (device);
+ device_file = udisks_linux_block_object_get_device_file (object);
+ udisks_daemon_util_trigger_uevent (object->daemon, device_file);
+ g_free (device_file);
}
/**
@@ -1083,19 +983,10 @@ udisks_linux_block_object_trigger_uevent (UDisksLinuxBlockObject *object)
* @timeout_seconds: Maximum time to wait for the uevent (in seconds).
*
* Triggers a 'change' uevent in the kernel and waits until it's received and
- * processed by udisks.
- *
- * Unlike udisks_linux_block_object_trigger_uevent() that just triggers
- * a synthetic uevent to the kernel, this call will actually block and wait until
- * the #UDisksLinuxProvider receives the uevent, performs probing and processes
- * the uevent further down the UDisks object stack. Upon returning from this
- * function call the caller may assume the event has been fully processed, all
- * D-Bus objects are updated and settled. Typically used in busy wait for
- * a particular D-Bus interface.
+ * processed through the uevent queue.
*
- * Note that this uses synthetic uevent tagging and only works on linux kernel
- * 4.13 and higher. In case an older kernel is detected this acts like the classic
- * udisks_linux_block_object_trigger_uevent() call and %FALSE is returned.
+ * This is a convenient wrapper around udisks_daemon_util_trigger_uevent_sync().
+ * Refer to this function for detailed documentation.
*
* Returns: %TRUE if the uevent has been successfully received, %FALSE otherwise
* or when the kernel version is too old.
@@ -1104,59 +995,16 @@ gboolean
udisks_linux_block_object_trigger_uevent_sync (UDisksLinuxBlockObject *object,
guint timeout_seconds)
{
- UDisksLinuxDevice *device;
- UDisksLinuxProvider *provider;
- SynthUeventData data;
- GMainContext *main_context;
- GSource *idle_source;
- GSource *timeout_source;
+ gchar *device_file;
+ gboolean ret;
g_return_val_if_fail (UDISKS_IS_LINUX_BLOCK_OBJECT (object), FALSE);
- if (bd_utils_check_linux_version (4, 13, 0) < 0)
- {
- udisks_linux_block_object_trigger_uevent (object);
- return FALSE;
- }
-
- data.object = object;
- device = udisks_linux_block_object_get_device (object);
- data.uevent_path = g_strconcat (g_udev_device_get_sysfs_path (device->udev_device), "/uevent", NULL);
- data.serial = g_atomic_int_add (&uevent_serial, 1);
-
- main_context = g_main_context_new ();
- g_main_context_push_thread_default (main_context);
- data.main_loop = g_main_loop_new (main_context, FALSE);
-
- /* queue the actual trigger in the loop */
- idle_source = g_idle_source_new ();
- g_source_set_callback (idle_source, (GSourceFunc) trigger_uevent_idle_cb, &data, NULL);
- g_source_attach (idle_source, main_context);
- g_source_unref (idle_source);
+ device_file = udisks_linux_block_object_get_device_file (object);
+ ret = udisks_daemon_util_trigger_uevent_sync (object->daemon, device_file, timeout_seconds);
+ g_free (device_file);
- /* add timeout as a fallback */
- timeout_source = g_timeout_source_new_seconds (timeout_seconds);
- g_source_set_callback (timeout_source, (GSourceFunc) uevent_wait_timeout_cb, &data, NULL);
- g_source_attach (timeout_source, main_context);
- g_source_unref (timeout_source);
-
- /* catch incoming uevents */
- provider = udisks_daemon_get_linux_provider (object->daemon);
- g_signal_connect (provider, "uevent-probed", G_CALLBACK (uevent_probed_cb), &data);
-
- data.success = FALSE;
- g_main_loop_run (data.main_loop);
-
- g_signal_handlers_disconnect_by_func (provider, uevent_probed_cb, &data);
- g_main_context_pop_thread_default (main_context);
-
- g_main_loop_unref (data.main_loop);
- g_main_context_unref (main_context);
-
- g_free (data.uevent_path);
- g_object_unref (device);
-
- return data.success;
+ return ret;
}
/* ---------------------------------------------------------------------------------------------------- */
--
2.26.2
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