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From 37e323f1d16720d662611866cde567b1d2a01d48 Mon Sep 17 00:00:00 2001
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From: Ondrej Holy <oholy@redhat.com>
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Date: Mon, 22 Jan 2024 15:29:37 +0100
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Subject: [PATCH 1/2] gunixmounts: Use libmnt_monitor API for monitoring
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The `GUnixMountMonitor` object implements monitoring on its own currently.
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Only the `/proc/mounts` file changes are monitored. It is not aware of the
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`/run/mount/utab` file changes. This file contains the userspace mount
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options (e.g. `x-gvfs-notrash`, `x-gvfs-hide`) among others. There is a
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problem when `/sbin/mount.<type>` (e.g. `mount.nfs`) helper programs are
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used. In that case, the `/run/mount/utab` file is updated later than the
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`/proc/mounts` file and thus the `GUnixMountMonitor` clients (e.g.
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`gvfs-udisks2-volume-monitor`, `gvfsd-trash`) don't see the userspace
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options until the next `mount-changed` signal. Let's use the `libmnt_monitor`
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API for monitoring instead and emit the `mount-changed` signal also when the
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`/run/mount/utab` file is changed.
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Related: https://issues.redhat.com/browse/RHEL-14607
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Related: https://github.com/util-linux/util-linux/pull/2607
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---
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gio/gunixmounts.c | 72 ++++++++++++++++++++++++++++++++++++++++++++++-
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1 file changed, 71 insertions(+), 1 deletion(-)
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diff --git a/gio/gunixmounts.c b/gio/gunixmounts.c
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index 32b936259..e11b34a7d 100644
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--- a/gio/gunixmounts.c
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+++ b/gio/gunixmounts.c
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@@ -202,6 +202,11 @@ static GSource *proc_mounts_watch_source;
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#define endmntent(f) fclose(f)
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#endif
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+#ifdef HAVE_LIBMOUNT
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+/* Protected by proc_mounts_source lock */
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+static struct libmnt_monitor *proc_mounts_monitor = NULL;
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+#endif
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+
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static gboolean
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is_in (const char *value, const char *set[])
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{
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@@ -1859,7 +1864,36 @@ proc_mounts_changed (GIOChannel *channel,
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GIOCondition cond,
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gpointer user_data)
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{
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+ gboolean has_changed = FALSE;
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+
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+#ifdef HAVE_LIBMOUNT
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+ if (cond & G_IO_IN)
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+ {
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+ G_LOCK (proc_mounts_source);
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+ if (proc_mounts_monitor != NULL)
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+ {
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+ int ret;
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+
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+ /* The mnt_monitor_next_change function needs to be used to avoid false-positives. */
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+ ret = mnt_monitor_next_change (proc_mounts_monitor, NULL, NULL);
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+ if (ret == 0)
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+ {
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+ has_changed = TRUE;
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+ ret = mnt_monitor_event_cleanup (proc_mounts_monitor);
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+ }
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+
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+ if (ret < 0)
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+ g_debug ("mnt_monitor_next_change failed: %s", g_strerror (-ret));
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+ }
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+ G_UNLOCK (proc_mounts_source);
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+ }
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+
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+#else
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if (cond & G_IO_ERR)
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+ has_changed = TRUE;
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+#endif
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+
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+ if (has_changed)
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{
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G_LOCK (proc_mounts_source);
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mount_poller_time = (guint64) g_get_monotonic_time ();
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@@ -1924,6 +1958,10 @@ mount_monitor_stop (void)
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g_source_destroy (proc_mounts_watch_source);
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proc_mounts_watch_source = NULL;
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}
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+
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+#ifdef HAVE_LIBMOUNT
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+ g_clear_pointer (&proc_mounts_monitor, mnt_unref_monitor);
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+#endif
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G_UNLOCK (proc_mounts_source);
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if (mtab_monitor)
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@@ -1965,9 +2003,37 @@ mount_monitor_start (void)
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*/
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if (g_str_has_prefix (mtab_path, "/proc/"))
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{
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- GIOChannel *proc_mounts_channel;
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+ GIOChannel *proc_mounts_channel = NULL;
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GError *error = NULL;
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+#ifdef HAVE_LIBMOUNT
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+ int ret;
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+
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+ G_LOCK (proc_mounts_source);
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+
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+ proc_mounts_monitor = mnt_new_monitor ();
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+ ret = mnt_monitor_enable_kernel (proc_mounts_monitor, TRUE);
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+ if (ret < 0)
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+ g_warning ("mnt_monitor_enable_kernel failed: %s", g_strerror (-ret));
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+
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+ ret = mnt_monitor_enable_userspace (proc_mounts_monitor, TRUE, NULL);
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+ if (ret < 0)
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+ g_warning ("mnt_monitor_enable_userspace failed: %s", g_strerror (-ret));
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+
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+ ret = mnt_monitor_get_fd (proc_mounts_monitor);
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+ if (ret >= 0)
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+ {
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+ proc_mounts_channel = g_io_channel_unix_new (ret);
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+ }
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+ else
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+ {
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+ g_set_error_literal (&error, G_IO_ERROR, g_io_error_from_errno (-ret),
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+ g_strerror (-ret));
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+ }
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+
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+ G_UNLOCK (proc_mounts_source);
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+#else
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proc_mounts_channel = g_io_channel_new_file (mtab_path, "r", &error);
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+#endif
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if (proc_mounts_channel == NULL)
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{
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g_warning ("Error creating IO channel for %s: %s (%s, %d)", mtab_path,
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@@ -1978,7 +2044,11 @@ mount_monitor_start (void)
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{
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G_LOCK (proc_mounts_source);
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+#ifdef HAVE_LIBMOUNT
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+ proc_mounts_watch_source = g_io_create_watch (proc_mounts_channel, G_IO_IN);
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+#else
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proc_mounts_watch_source = g_io_create_watch (proc_mounts_channel, G_IO_ERR);
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+#endif
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mount_poller_time = (guint64) g_get_monotonic_time ();
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g_source_set_callback (proc_mounts_watch_source,
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(GSourceFunc) proc_mounts_changed,
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--
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2.43.0
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From bb7d6b8fcef36af5452071c8758f89955888469a Mon Sep 17 00:00:00 2001
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From: Ondrej Holy <oholy@redhat.com>
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Date: Wed, 31 Jan 2024 13:35:39 +0100
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Subject: [PATCH 2/2] gunixmounts: Use mnt_monitor_veil_kernel option
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The previous commit enabled the `/run/mount/utab` monitoring. The problem
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is that the `mount-changed` signal can be emitted twice for one mount. One
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for the `/proc/mounts` file change and another one for the `/run/media/utab`
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file change. This is still not ideal because e.g. the `GMount` objects for
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mounts with the `x-gvfs-hide` option are added and immediately removed.
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Let's enable the `mnt_monitor_veil_kernel` option to avoid this.
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Related: https://github.com/util-linux/util-linux/pull/2725
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---
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gio/gunixmounts.c | 6 ++++++
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meson.build | 4 ++++
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2 files changed, 10 insertions(+)
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diff --git a/gio/gunixmounts.c b/gio/gunixmounts.c
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index e11b34a7d..6abe87414 100644
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--- a/gio/gunixmounts.c
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+++ b/gio/gunixmounts.c
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@@ -2019,6 +2019,12 @@ mount_monitor_start (void)
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if (ret < 0)
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g_warning ("mnt_monitor_enable_userspace failed: %s", g_strerror (-ret));
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+#ifdef HAVE_MNT_MONITOR_VEIL_KERNEL
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+ ret = mnt_monitor_veil_kernel (proc_mounts_monitor, TRUE);
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+ if (ret < 0)
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+ g_warning ("mnt_monitor_veil_kernel failed: %s", g_strerror (-ret));
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+#endif
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+
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ret = mnt_monitor_get_fd (proc_mounts_monitor);
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if (ret >= 0)
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{
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diff --git a/meson.build b/meson.build
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index a0502fe69..159703557 100644
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--- a/meson.build
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+++ b/meson.build
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@@ -2102,6 +2102,10 @@ libmount_dep = []
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if host_system == 'linux'
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libmount_dep = dependency('mount', version : '>=2.23', required : get_option('libmount'))
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glib_conf.set('HAVE_LIBMOUNT', libmount_dep.found())
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+
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+ if libmount_dep.found() and cc.has_function('mnt_monitor_veil_kernel', dependencies: libmount_dep)
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+ glib_conf.set('HAVE_MNT_MONITOR_VEIL_KERNEL', 1)
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+ endif
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endif
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# gnutls is used optionally by GHmac
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--
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2.43.0
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Michael Catanzaro