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Enforce the quota on these two tmpfs at the same place where we mount
the per-user $XDG_RUNTIME_DIR. Conceptually these are very similar
concepts, and it makes sure to enforce the limits at the same place with
the same lifecycle.
Sometimes it's nice being able to store dev_t as pointer values in
hashmaps/tables, instead of having to allocate memory for them and using
devt_hash_ops. After all dev_t is weird on Linux/glibc: glibc defines it
as 64bit entity (which hence appears as something we cannot encode in a
pointer value for compat with 32bit archs) but it actually is 32bit in
the kernel apis. Hence we can safely cut off the upper 32bit, and still
retain compat with all archs.
But let's hide this in new macros, and validate this is all correct via
a test.
Recently, we introduce 'clock' system group, and set it for rtc/ptp
devices. See af96ccfc24bc4803078a46b4ef2cdeb5decdfbcd.
However, if non-system group with the same name is already exist,
previously the devices were owned by the non-system group. That may
possibly happen on updating systemd.
Let's avoid accidentally devices being owned by non-system user/group.
Previously, when an unknown or invalid user/group is specified,
a token was installed with UID_INVALID/GID_INVALID. That's not only
meaningless in most cases, but also clears previous assignment,
if multiple OWNER=/GROUP= token exist for the same device, e.g.
KERNEL=="sda", GROUP="disk"
KERNEL=="sda", GROUP="nonexistentuser"
This makes when an unknown user/group is specified, the line will be
ignored. Hence, in the above example, the device will be owned by the
group "disk".
This drops -ENOENT error check for get_user_creds()/get_group_creds(),
as nowadays they always return -ESRCH when the specified user/groups
cannot be found.
This also adds short comments for NULL arguments.
File system modules should be something the kernel can autoload
automatically, and according to my testing that works fine, hence let's
drop the explicit deps, in particular as systems usually stick to one fs
for these things, not both.
I inquired bluca about the reason to add it, and didn't remember
anymore, and was fine with me removing this. So let's remove this for
now, should issues arise we can revert this.
mountfsd is supposed to be available during early boot aleady, before
systemd-tmpfiles-setup-dev-early.service completes, hence make sure
loopback devices and DM already work before that.
As suggested by yuwata here:
https://github.com/systemd/systemd/pull/35685#issuecomment-2608157569
Previously, if e.g. DRIVER=foo is specified in uevent file, the value is
only saved as property, but was not set to sd_device.driver.
That was inconsistent to the case when a device is created through
netlink uevent.
Let's always set when we get e.g. sd_device.driver when DRIVER=foo
from both uevent file and netlink uevent.
This makes sd_device_get_sysattr_value()/sd_device_set_sysattr_value()
refuse to read/write files outside of sysfs for safety.
Also this makes
- use chase() to resolve and open the symlink in path to sysfs attribute,
- use delete_trailing_chars(),
- include error code in cache entry, so we can cache more error cases,
- refuse caching value written to uevent file of any devices, i.e.
sd_device_set_sysattr_value(dev, "../uevent", "add") will also not
cache the value "add".
Also, when a filename is specified, also search udev rules file in
udev/rules.d directories.
This also refuses non-existing files, and file neither nor a regular
nor a directory, e.g. /dev/null.
- set destructors to catalog_hash_ops,
- acquire OrderedHashmap when necessary,
- gracefully handle NULL catalog directories and output stream,
- rename function output arguments,
- add many many assertions,
- use RET_GATHER().
