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device: create units with intended "found" value

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Change device_found_node() to also create a .device unit if a device is not
known by udev; this is the case for "tentative" devices picked up by mountinfo
(DEVICE_FOUND_MOUNT).  With that we can record the "found" attribute on the
unit.

Change device_setup_unit() to also accept a NULL udev_device, and don't
add the extra udev information in that case.

Previously device_found_node() would not create a .device unit, and
unit_add_node_link() would then create a "dead" stub one via
manager_load_unit(), so we lost the "found" attribute and unmounted everything
from that device.

https://launchpad.net/bugs/1444402
http://lists.freedesktop.org/archives/systemd-devel/2015-May/031658.html
This commit is contained in:
Martin Pitt 2015-05-17 15:07:47 +02:00 committed by Lennart Poettering
parent 139e533628
commit 2005219f83
1 changed files with 24 additions and 27 deletions
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27
src/core/device.c
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@ -292,18 +292,19 @@ static int device_add_udev_wants(Unit *u, struct udev_device *dev) {
static int device_setup_unit(Manager *m, struct udev_device *dev, const char *path, bool main) {
_cleanup_free_ char *e = NULL;
const char *sysfs;
const char *sysfs = NULL;
Unit *u = NULL;
bool delete;
int r;
assert(m);
assert(dev);
assert(path);
if (dev) {
sysfs = udev_device_get_syspath(dev);
if (!sysfs)
return 0;
}
r = unit_name_from_path(path, ".device", &e);
if (r < 0)
@ -312,6 +313,7 @@ static int device_setup_unit(Manager *m, struct udev_device *dev, const char *pa
u = manager_get_unit(m, e);
if (u &&
sysfs &&
DEVICE(u)->sysfs &&
!path_equal(DEVICE(u)->sysfs, sysfs)) {
log_unit_debug(u, "Device %s appeared twice with different sysfs paths %s and %s", e, DEVICE(u)->sysfs, sysfs);
@ -336,7 +338,7 @@ static int device_setup_unit(Manager *m, struct udev_device *dev, const char *pa
/* If this was created via some dependency and has not
* actually been seen yet ->sysfs will not be
* initialized. Hence initialize it if necessary. */
if (sysfs) {
r = device_set_sysfs(DEVICE(u), sysfs);
if (r < 0)
goto fail;
@ -347,6 +349,8 @@ static int device_setup_unit(Manager *m, struct udev_device *dev, const char *pa
* 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 */
@ -788,23 +792,16 @@ int device_found_node(Manager *m, const char *node, bool add, DeviceFound found,
* will still have a device node even when the medium
* is not there... */
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 (stat(node, &st) >= 0) {
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;
if (!dev && errno != ENOENT)
return log_error_errno(errno, "Failed to get udev device from devnum %u:%u: %m", major(st.st_rdev), minor(st.st_rdev));
return log_oom();
}
} else if (errno != ENOENT)
return log_error_errno(errno, "Failed to stat device node file %s: %m", node);
/* If the device is known in the kernel and newly
* appeared, then we'll create a device unit for it,