unit: make ignoring in snapshots a per unit property, instead of a per unit type...

[elogind.git] / src / device.c

diff --git a/src/device.c b/src/device.c
index a196a982a02c153582938ac78f3881329d8786b8..64b21903edd848f185f745bd5f58b94d44b23a09 100644 (file)
--- a/src/device.c
+++ b/src/device.c
@@ -1,4 +1,4 @@
-/*-*- Mode: C; c-basic-offset: 8 -*-*/
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
 
 /***
   This file is part of systemd.
@@ -29,6 +29,7 @@
 #include "log.h"
 #include "unit-name.h"
 #include "dbus-device.h"
+#include "def.h"
 
 static const UnitActiveState state_translation_table[_DEVICE_STATE_MAX] = {
         [DEVICE_DEAD] = UNIT_INACTIVE,
@@ -65,10 +66,13 @@ static void device_init(Unit *u) {
 
         /* In contrast to all other unit types we timeout jobs waiting
          * for devices by default. This is because they otherwise wait
-         * indefinetely for plugged in devices, something which cannot
+         * indefinitely for plugged in devices, something which cannot
          * happen for the other units since their operations time out
          * anyway. */
         d->meta.job_timeout = DEFAULT_TIMEOUT_USEC;
+
+        d->meta.ignore_on_isolate = true;
+        d->meta.ignore_on_snapshot = true;
 }
 
 static void device_done(Unit *u) {
@@ -92,7 +96,7 @@ static void device_set_state(Device *d, DeviceState state) {
                           device_state_to_string(old_state),
                           device_state_to_string(state));
 
-        unit_notify(UNIT(d), state_translation_table[old_state], state_translation_table[state]);
+        unit_notify(UNIT(d), state_translation_table[old_state], state_translation_table[state], true);
 }
 
 static int device_coldplug(Unit *u) {
@@ -188,11 +192,8 @@ static int device_update_unit(Manager *m, struct udev_device *dev, const char *p
         if ((r = device_find_escape_name(m, path, &u)) < 0)
                 return r;
 
-        /* If this is a different unit, then let's not merge things */
-        if (u && DEVICE(u)->sysfs && !path_equal(DEVICE(u)->sysfs, sysfs)) {
-                log_error("Hmm, something's broken. Asked to create two devices with same name but different sysfs paths.");
+        if (u && DEVICE(u)->sysfs && !path_equal(DEVICE(u)->sysfs, sysfs))
                 return -EEXIST;
-        }
 
         if (!u) {
                 delete = true;
@@ -307,6 +308,7 @@ static int device_process_new_device(Manager *m, struct udev_device *dev, bool u
         first = udev_device_get_devlinks_list_entry(dev);
         udev_list_entry_foreach(item, first) {
                 const char *p;
+                struct stat st;
 
                 /* Don't bother with the /dev/block links */
                 p = udev_list_entry_get_name(item);
@@ -315,6 +317,18 @@ static int device_process_new_device(Manager *m, struct udev_device *dev, bool u
                     path_startswith(p, "/dev/char/"))
                         continue;
 
+                /* Verify that the symlink in the FS actually belongs
+                 * to this device. This is useful to deal with
+                 * conflicting devices, e.g. when two disks want the
+                 * same /dev/disk/by-label/xxx link because they have
+                 * the same label. We want to make sure that the same
+                 * device that won the symlink wins in systemd, so we
+                 * check the device node major/minor*/
+                if (stat(p, &st) >= 0)
+                        if ((!S_ISBLK(st.st_mode) && !S_ISCHR(st.st_mode)) ||
+                            st.st_rdev != udev_device_get_devnum(dev))
+                                continue;
+
                 device_update_unit(m, dev, p, false);
         }
 
@@ -391,6 +405,39 @@ static Unit *device_following(Unit *u) {
         return UNIT(first);
 }
 
+static int device_following_set(Unit *u, Set **_s) {
+        Device *d = DEVICE(u);
+        Device *other;
+        Set *s;
+        int r;
+
+        assert(d);
+        assert(_s);
+
+        if (!d->same_sysfs_prev && !d->same_sysfs_next) {
+                *_s = NULL;
+                return 0;
+        }
+
+        if (!(s = set_new(NULL, NULL)))
+                return -ENOMEM;
+
+        for (other = d->same_sysfs_next; other; other = other->same_sysfs_next)
+                if ((r = set_put(s, other)) < 0)
+                        goto fail;
+
+        for (other = d->same_sysfs_prev; other; other = other->same_sysfs_prev)
+                if ((r = set_put(s, other)) < 0)
+                        goto fail;
+
+        *_s = s;
+        return 1;
+
+fail:
+        set_free(s);
+        return r;
+}
+
 static void device_shutdown(Manager *m) {
         assert(m);
 
@@ -425,6 +472,11 @@ static int device_enumerate(Manager *m) {
                         goto fail;
                 }
 
+                /* This will fail if we are unprivileged, but that
+                 * should not matter much, as user instances won't run
+                 * during boot. */
+                udev_monitor_set_receive_buffer_size(m->udev_monitor, 128*1024*1024);
+
                 if (udev_monitor_filter_add_match_tag(m->udev_monitor, "systemd") < 0) {
                         r = -ENOMEM;
                         goto fail;
@@ -478,13 +530,24 @@ fail:
 void device_fd_event(Manager *m, int events) {
         struct udev_device *dev;
         int r;
-        const char *action;
+        const char *action, *ready;
 
         assert(m);
-        assert(events == EPOLLIN);
+
+        if (events != EPOLLIN) {
+                static RATELIMIT_DEFINE(limit, 10*USEC_PER_SEC, 5);
+
+                if (!ratelimit_test(&limit))
+                        log_error("Failed to get udev event: %m");
+                if (!(events & EPOLLIN))
+                        return;
+        }
 
         if (!(dev = udev_monitor_receive_device(m->udev_monitor))) {
-                log_error("Failed to receive device.");
+                /*
+                 * libudev might filter-out devices which pass the bloom filter,
+                 * so getting NULL here is not necessarily an error
+                 */
                 return;
         }
 
@@ -493,7 +556,9 @@ void device_fd_event(Manager *m, int events) {
                 goto fail;
         }
 
-        if (streq(action, "remove")) {
+        ready = udev_device_get_property_value(dev, "SYSTEMD_READY");
+
+        if (streq(action, "remove") || (ready && parse_boolean(ready) == 0)) {
                 if ((r = device_process_removed_device(m, dev)) < 0) {
                         log_error("Failed to process udev device event: %s", strerror(-r));
                         goto fail;
@@ -519,11 +584,7 @@ DEFINE_STRING_TABLE_LOOKUP(device_state, DeviceState);
 const UnitVTable device_vtable = {
         .suffix = ".device",
 
-        .no_requires = true,
         .no_instances = true,
-        .no_snapshots = true,
-        .no_isolate = true,
-        .no_alias = true,
 
         .init = device_init,
 
@@ -536,9 +597,12 @@ const UnitVTable device_vtable = {
         .active_state = device_active_state,
         .sub_state_to_string = device_sub_state_to_string,
 
+        .bus_interface = "org.freedesktop.systemd1.Device",
         .bus_message_handler = bus_device_message_handler,
+        .bus_invalidating_properties =  bus_device_invalidating_properties,
 
         .following = device_following,
+        .following_set = device_following_set,
 
         .enumerate = device_enumerate,
         .shutdown = device_shutdown