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Diffstat (limited to 'src/core/device.c')
-rw-r--r--src/core/device.c368
1 files changed, 223 insertions, 145 deletions
diff --git a/src/core/device.c b/src/core/device.c
index 2d983cc56..e41ed4149 100644
--- a/src/core/device.c
+++ b/src/core/device.c
@@ -34,7 +34,8 @@
static const UnitActiveState state_translation_table[_DEVICE_STATE_MAX] = {
[DEVICE_DEAD] = UNIT_INACTIVE,
- [DEVICE_PLUGGED] = UNIT_ACTIVE
+ [DEVICE_TENTATIVE] = UNIT_ACTIVATING,
+ [DEVICE_PLUGGED] = UNIT_ACTIVE,
};
static int device_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata);
@@ -63,6 +64,41 @@ static void device_unset_sysfs(Device *d) {
d->sysfs = NULL;
}
+static int device_set_sysfs(Device *d, const char *sysfs) {
+ Device *first;
+ char *copy;
+ int r;
+
+ assert(d);
+
+ if (streq_ptr(d->sysfs, sysfs))
+ return 0;
+
+ r = hashmap_ensure_allocated(&UNIT(d)->manager->devices_by_sysfs, &string_hash_ops);
+ if (r < 0)
+ return r;
+
+ copy = strdup(sysfs);
+ if (!copy)
+ return -ENOMEM;
+
+ device_unset_sysfs(d);
+
+ first = hashmap_get(UNIT(d)->manager->devices_by_sysfs, sysfs);
+ LIST_PREPEND(same_sysfs, first, d);
+
+ r = hashmap_replace(UNIT(d)->manager->devices_by_sysfs, copy, first);
+ if (r < 0) {
+ LIST_REMOVE(same_sysfs, first, d);
+ free(copy);
+ return r;
+ }
+
+ d->sysfs = copy;
+
+ return 0;
+}
+
static void device_init(Unit *u) {
Device *d = DEVICE(u);
@@ -110,8 +146,13 @@ static int device_coldplug(Unit *u) {
assert(d);
assert(d->state == DEVICE_DEAD);
- if (d->sysfs)
+ if (d->found & DEVICE_FOUND_UDEV)
+ /* If udev says the device is around, it's around */
device_set_state(d, DEVICE_PLUGGED);
+ else if (d->found != DEVICE_NOT_FOUND)
+ /* If a device is found in /proc/self/mountinfo or
+ * /proc/swaps, it's "tentatively" around. */
+ device_set_state(d, DEVICE_TENTATIVE);
return 0;
}
@@ -140,49 +181,9 @@ _pure_ static const char *device_sub_state_to_string(Unit *u) {
return device_state_to_string(DEVICE(u)->state);
}
-static int device_add_escaped_name(Unit *u, const char *dn) {
- _cleanup_free_ char *e = NULL;
- int r;
-
- assert(u);
- assert(dn);
- assert(dn[0] == '/');
-
- e = unit_name_from_path(dn, ".device");
- if (!e)
- return -ENOMEM;
-
- r = unit_add_name(u, e);
- if (r < 0 && r != -EEXIST)
- return r;
-
- return 0;
-}
-
-static int device_find_escape_name(Manager *m, const char *dn, Unit **_u) {
- _cleanup_free_ char *e = NULL;
- Unit *u;
-
- assert(m);
- assert(dn);
- assert(dn[0] == '/');
- assert(_u);
-
- e = unit_name_from_path(dn, ".device");
- if (!e)
- return -ENOMEM;
-
- u = manager_get_unit(m, e);
- if (u) {
- *_u = u;
- return 1;
- }
-
- return 0;
-}
-
-static int device_make_description(Unit *u, struct udev_device *dev, const char *path) {
+static int device_update_description(Unit *u, struct udev_device *dev, const char *path) {
const char *model;
+ int r;
assert(u);
assert(dev);
@@ -207,13 +208,16 @@ static int device_make_description(Unit *u, struct udev_device *dev, const char
j = strjoin(model, " ", label, NULL);
if (j)
- return unit_set_description(u, j);
- }
+ r = unit_set_description(u, j);
+ } else
+ r = unit_set_description(u, model);
+ } else
+ r = unit_set_description(u, path);
- return unit_set_description(u, model);
- }
+ if (r < 0)
+ log_unit_error_errno(u->id, r, "Failed to set device description: %m");
- return unit_set_description(u, path);
+ return r;
}
static int device_add_udev_wants(Unit *u, struct udev_device *dev) {
@@ -240,20 +244,20 @@ static int device_add_udev_wants(Unit *u, struct udev_device *dev) {
n = unit_name_mangle(e, MANGLE_NOGLOB);
if (!n)
- return -ENOMEM;
+ return log_oom();
r = unit_add_dependency_by_name(u, UNIT_WANTS, n, NULL, true);
if (r < 0)
- return r;
+ return log_unit_error_errno(u->id, r, "Failed to add wants dependency: %m");
}
if (!isempty(state))
- log_unit_warning(u->id, "Property %s on %s has trailing garbage, ignoring.",
- property, strna(udev_device_get_syspath(dev)));
+ log_unit_warning(u->id, "Property %s on %s has trailing garbage, ignoring.", property, strna(udev_device_get_syspath(dev)));
return 0;
}
-static int device_update_unit(Manager *m, struct udev_device *dev, const char *path, bool main) {
+static int device_setup_unit(Manager *m, struct udev_device *dev, const char *path, bool main) {
+ _cleanup_free_ char *e = NULL;
const char *sysfs;
Unit *u = NULL;
bool delete;
@@ -267,12 +271,18 @@ static int device_update_unit(Manager *m, struct udev_device *dev, const char *p
if (!sysfs)
return 0;
- r = device_find_escape_name(m, path, &u);
- if (r < 0)
- return r;
+ e = unit_name_from_path(path, ".device");
+ if (!e)
+ return log_oom();
+
+ u = manager_get_unit(m, e);
- if (u && DEVICE(u)->sysfs && !path_equal(DEVICE(u)->sysfs, sysfs))
+ if (u &&
+ DEVICE(u)->sysfs &&
+ !path_equal(DEVICE(u)->sysfs, sysfs)) {
+ log_unit_error(u->id, "Device %s appeared twice with different sysfs paths %s and %s", e, DEVICE(u)->sysfs, sysfs);
return -EEXIST;
+ }
if (!u) {
delete = true;
@@ -281,7 +291,7 @@ static int device_update_unit(Manager *m, struct udev_device *dev, const char *p
if (!u)
return log_oom();
- r = device_add_escaped_name(u, path);
+ r = unit_add_name(u, e);
if (r < 0)
goto fail;
@@ -293,37 +303,16 @@ static int device_update_unit(Manager *m, struct udev_device *dev, const char *p
* actually been seen yet ->sysfs will not be
* initialized. Hence initialize it if necessary. */
- if (!DEVICE(u)->sysfs) {
- Device *first;
-
- DEVICE(u)->sysfs = strdup(sysfs);
- if (!DEVICE(u)->sysfs) {
- r = -ENOMEM;
- goto fail;
- }
-
- r = hashmap_ensure_allocated(&m->devices_by_sysfs, &string_hash_ops);
- if (r < 0)
- goto fail;
-
- first = hashmap_get(m->devices_by_sysfs, sysfs);
- LIST_PREPEND(same_sysfs, first, DEVICE(u));
-
- r = hashmap_replace(m->devices_by_sysfs, DEVICE(u)->sysfs, first);
- if (r < 0)
- goto fail;
- }
-
- device_make_description(u, dev, path);
+ r = device_set_sysfs(DEVICE(u), sysfs);
+ if (r < 0)
+ goto fail;
- if (main) {
- /* The additional systemd udev properties we only
- * interpret for the main object */
+ (void) device_update_description(u, dev, path);
- r = device_add_udev_wants(u, dev);
- if (r < 0)
- goto fail;
- }
+ /* The additional systemd udev properties we only interpret
+ * for the main object */
+ if (main)
+ (void) device_add_udev_wants(u, dev);
/* Note that this won't dispatch the load queue, the caller
* has to do that if needed and appropriate */
@@ -332,7 +321,7 @@ static int device_update_unit(Manager *m, struct udev_device *dev, const char *p
return 0;
fail:
- log_warning_errno(r, "Failed to load device unit: %m");
+ log_unit_warning_errno(u->id, r, "Failed to set up device unit: %m");
if (delete && u)
unit_free(u);
@@ -340,7 +329,7 @@ fail:
return r;
}
-static int device_process_new_device(Manager *m, struct udev_device *dev) {
+static int device_process_new(Manager *m, struct udev_device *dev) {
const char *sysfs, *dn, *alias;
struct udev_list_entry *item = NULL, *first = NULL;
int r;
@@ -352,14 +341,14 @@ static int device_process_new_device(Manager *m, struct udev_device *dev) {
return 0;
/* Add the main unit named after the sysfs path */
- r = device_update_unit(m, dev, sysfs, true);
+ r = device_setup_unit(m, dev, sysfs, true);
if (r < 0)
return r;
/* Add an additional unit for the device node */
dn = udev_device_get_devnode(dev);
if (dn)
- device_update_unit(m, dev, dn, false);
+ (void) device_setup_unit(m, dev, dn, false);
/* Add additional units for all symlinks */
first = udev_device_get_devlinks_list_entry(dev);
@@ -386,7 +375,7 @@ static int device_process_new_device(Manager *m, struct udev_device *dev) {
st.st_rdev != udev_device_get_devnum(dev))
continue;
- device_update_unit(m, dev, p, false);
+ (void) device_setup_unit(m, dev, p, false);
}
/* Add additional units for all explicitly configured
@@ -403,7 +392,7 @@ static int device_process_new_device(Manager *m, struct udev_device *dev) {
e[l] = 0;
if (path_is_absolute(e))
- device_update_unit(m, dev, e, false);
+ (void) device_setup_unit(m, dev, e, false);
else
log_warning("SYSTEMD_ALIAS for %s is not an absolute path, ignoring: %s", sysfs, e);
}
@@ -414,39 +403,62 @@ static int device_process_new_device(Manager *m, struct udev_device *dev) {
return 0;
}
-static void device_set_path_plugged(Manager *m, struct udev_device *dev) {
- const char *sysfs;
+static void device_update_found_one(Device *d, bool add, DeviceFound found, bool now) {
+ DeviceFound n;
+
+ assert(d);
+
+ n = add ? (d->found | found) : (d->found & ~found);
+ if (n == d->found)
+ return;
+
+ d->found = n;
+
+ if (now) {
+ if (d->found & DEVICE_FOUND_UDEV)
+ device_set_state(d, DEVICE_PLUGGED);
+ else if (d->found != DEVICE_NOT_FOUND)
+ device_set_state(d, DEVICE_TENTATIVE);
+ else
+ device_set_state(d, DEVICE_DEAD);
+ }
+}
+
+static int device_update_found_by_sysfs(Manager *m, const char *sysfs, bool add, DeviceFound found, bool now) {
Device *d, *l;
assert(m);
- assert(dev);
+ assert(sysfs);
- sysfs = udev_device_get_syspath(dev);
- if (!sysfs)
- return;
+ if (found == DEVICE_NOT_FOUND)
+ return 0;
l = hashmap_get(m->devices_by_sysfs, sysfs);
LIST_FOREACH(same_sysfs, d, l)
- device_set_state(d, DEVICE_PLUGGED);
+ device_update_found_one(d, add, found, now);
+
+ return 0;
}
-static int device_process_removed_device(Manager *m, struct udev_device *dev) {
- const char *sysfs;
- Device *d;
+static int device_update_found_by_name(Manager *m, const char *path, bool add, DeviceFound found, bool now) {
+ _cleanup_free_ char *e = NULL;
+ Unit *u;
assert(m);
- assert(dev);
+ assert(path);
- sysfs = udev_device_get_syspath(dev);
- if (!sysfs)
- return -ENOMEM;
+ if (found == DEVICE_NOT_FOUND)
+ return 0;
- /* Remove all units of this sysfs path */
- while ((d = hashmap_get(m->devices_by_sysfs, sysfs))) {
- device_unset_sysfs(d);
- device_set_state(d, DEVICE_DEAD);
- }
+ e = unit_name_from_path(path, ".device");
+ if (!e)
+ return log_oom();
+ u = manager_get_unit(m, e);
+ if (!u)
+ return 0;
+
+ device_update_found_one(DEVICE(u), add, found, now);
return 0;
}
@@ -462,22 +474,6 @@ static bool device_is_ready(struct udev_device *dev) {
return parse_boolean(ready) != 0;
}
-static int device_process_new_path(Manager *m, const char *path) {
- _cleanup_udev_device_unref_ struct udev_device *dev = NULL;
-
- assert(m);
- assert(path);
-
- dev = udev_device_new_from_syspath(m->udev, path);
- if (!dev)
- return log_oom();
-
- if (!device_is_ready(dev))
- return 0;
-
- return device_process_new_device(m, dev);
-}
-
static Unit *device_following(Unit *u) {
Device *d = DEVICE(u);
Device *other, *first = NULL;
@@ -604,12 +600,31 @@ static int device_enumerate(Manager *m) {
goto fail;
first = udev_enumerate_get_list_entry(e);
- udev_list_entry_foreach(item, first)
- device_process_new_path(m, udev_list_entry_get_name(item));
+ udev_list_entry_foreach(item, first) {
+ _cleanup_udev_device_unref_ struct udev_device *dev = NULL;
+ const char *sysfs;
+
+ sysfs = udev_list_entry_get_name(item);
+
+ dev = udev_device_new_from_syspath(m->udev, sysfs);
+ if (!dev) {
+ log_oom();
+ continue;
+ }
+
+ if (!device_is_ready(dev))
+ continue;
+
+ (void) device_process_new(m, dev);
+
+ device_update_found_by_sysfs(m, sysfs, true, DEVICE_FOUND_UDEV, false);
+ }
return 0;
fail:
+ log_error_errno(r, "Failed to enumerate devices: %m");
+
device_shutdown(m);
return r;
}
@@ -617,7 +632,7 @@ fail:
static int device_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata) {
_cleanup_udev_device_unref_ struct udev_device *dev = NULL;
Manager *m = userdata;
- const char *action;
+ const char *action, *sysfs;
int r;
assert(m);
@@ -639,33 +654,47 @@ static int device_dispatch_io(sd_event_source *source, int fd, uint32_t revents,
if (!dev)
return 0;
+ sysfs = udev_device_get_syspath(dev);
+ if (!sysfs) {
+ log_error("Failed to get udev sys path.");
+ return 0;
+ }
+
action = udev_device_get_action(dev);
if (!action) {
log_error("Failed to get udev action string.");
return 0;
}
- if (streq(action, "remove") || !device_is_ready(dev)) {
- r = device_process_removed_device(m, dev);
- if (r < 0)
- log_error_errno(r, "Failed to process device remove event: %m");
-
- r = swap_process_removed_device(m, dev);
+ if (streq(action, "remove")) {
+ r = swap_process_device_remove(m, dev);
if (r < 0)
log_error_errno(r, "Failed to process swap device remove event: %m");
- } else {
- r = device_process_new_device(m, dev);
- if (r < 0)
- log_error_errno(r, "Failed to process device new event: %m");
+ /* If we get notified that a device was removed by
+ * udev, then it's completely gone, hence unset all
+ * found bits */
+ device_update_found_by_sysfs(m, sysfs, false, DEVICE_FOUND_UDEV|DEVICE_FOUND_MOUNT|DEVICE_FOUND_SWAP, true);
- r = swap_process_new_device(m, dev);
+ } else if (device_is_ready(dev)) {
+
+ (void) device_process_new(m, dev);
+
+ r = swap_process_device_new(m, dev);
if (r < 0)
log_error_errno(r, "Failed to process swap device new event: %m");
manager_dispatch_load_queue(m);
- device_set_path_plugged(m, dev);
+ /* The device is found now, set the udev found bit */
+ device_update_found_by_sysfs(m, sysfs, true, DEVICE_FOUND_UDEV, true);
+
+ } else {
+ /* The device is nominally around, but not ready for
+ * us. Hence unset the udev bit, but leave the rest
+ * around. */
+
+ device_update_found_by_sysfs(m, sysfs, false, DEVICE_FOUND_UDEV, true);
}
return 0;
@@ -684,9 +713,58 @@ static bool device_supported(Manager *m) {
return read_only <= 0;
}
+int device_found_node(Manager *m, const char *node, bool add, DeviceFound found, bool now) {
+ _cleanup_udev_device_unref_ struct udev_device *dev = NULL;
+ struct stat st;
+
+ assert(m);
+ assert(node);
+
+ /* This is called whenever we find a device referenced in
+ * /proc/swaps or /proc/self/mounts. Such a device might be
+ * mounted/enabled at a time where udev has not finished
+ * probing it yet, and we thus haven't learned about it
+ * yet. In this case we will set the device unit to
+ * "tentative" state. */
+
+ if (add) {
+ if (!path_startswith(node, "/dev"))
+ return 0;
+
+ if (stat(node, &st) < 0) {
+ if (errno == ENOENT)
+ return 0;
+
+ return log_error_errno(errno, "Failed to stat device node file %s: %m", node);
+ }
+
+ if (!S_ISBLK(st.st_mode) && !S_ISCHR(st.st_mode))
+ return 0;
+
+ dev = udev_device_new_from_devnum(m->udev, S_ISBLK(st.st_mode) ? 'b' : 'c', st.st_rdev);
+ if (!dev) {
+ if (errno == ENOENT)
+ return 0;
+
+ return log_oom();
+ }
+
+ /* If the device is known in the kernel and newly
+ * appeared, then we'll create a device unit for it,
+ * under the name referenced in /proc/swaps or
+ * /proc/self/mountinfo. */
+
+ (void) device_setup_unit(m, dev, node, false);
+ }
+
+ /* Update the device unit's state, should it exist */
+ return device_update_found_by_name(m, node, add, found, now);
+}
+
static const char* const device_state_table[_DEVICE_STATE_MAX] = {
[DEVICE_DEAD] = "dead",
- [DEVICE_PLUGGED] = "plugged"
+ [DEVICE_TENTATIVE] = "tentative",
+ [DEVICE_PLUGGED] = "plugged",
};
DEFINE_STRING_TABLE_LOOKUP(device_state, DeviceState);
generated by cgit v1.2.3 (git 2.25.1) at 2024-06-01 23:48:23 +0000