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Diffstat (limited to '')
-rw-r--r-- | src/core/device.h | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/src/core/device.h b/src/core/device.h new file mode 100644 index 0000000..9dd6fb5 --- /dev/null +++ b/src/core/device.h @@ -0,0 +1,44 @@ +/* SPDX-License-Identifier: LGPL-2.1-or-later */ +#pragma once + +#include "unit.h" + +typedef struct Device Device; + +/* A mask specifying where we have seen the device currently. This is a bitmask because the device might show up + * asynchronously from each other at various places. For example, in very common case a device might already be mounted + * before udev finished probing it (think: a script setting up a loopback block device, formatting it and mounting it + * in quick succession). Hence we need to track precisely where it is already visible and where not. */ +typedef enum DeviceFound { + DEVICE_NOT_FOUND = 0, + DEVICE_FOUND_UDEV = 1 << 0, /* The device has shown up in the udev database */ + DEVICE_FOUND_MOUNT = 1 << 1, /* The device has shown up in /proc/self/mountinfo */ + DEVICE_FOUND_SWAP = 1 << 2, /* The device has shown up in /proc/swaps */ + DEVICE_FOUND_MASK = DEVICE_FOUND_UDEV|DEVICE_FOUND_MOUNT|DEVICE_FOUND_SWAP, +} DeviceFound; + +struct Device { + Unit meta; + + char *sysfs, *deserialized_sysfs; + char *path; /* syspath, device node, alias, or devlink */ + + /* In order to be able to distinguish dependencies on different device nodes we might end up creating multiple + * devices for the same sysfs path. We chain them up here. */ + LIST_FIELDS(struct Device, same_sysfs); + + DeviceState state, deserialized_state; + DeviceFound found, deserialized_found, enumerated_found; + + bool bind_mounts; + + /* The SYSTEMD_WANTS udev property for this device the last time we saw it */ + char **wants_property; +}; + +extern const UnitVTable device_vtable; + +void device_found_node(Manager *m, const char *node, DeviceFound found, DeviceFound mask); +bool device_shall_be_bound_by(Unit *device, Unit *u); + +DEFINE_CAST(DEVICE, Device); |