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dev-type: check for DEVLINKS udev db variable existence if udev_device_get_is_initialized fn is not present

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Older udev versions (udev < v165), don't have the official
udev_device_get_is_initialized function available to query for
device initialization state in udev database. Also, devices don't
have USEC_INITIALIZED udev db variable set - this is bound to the
udev_device_get_is_initialized fn functionality.

In this case, check for "DEVLINKS" variable instead - all block devices
have at least one symlink set for the node (the "/dev/block/<major:minor>".
This symlink is set by default basic udev rules provided by udev directly.
We'll use this as an alternative for the check that initial udev
processing for a device has already finished.
This commit is contained in:
Peter Rajnoha 2016-09-06 13:12:02 +02:00
parent 2e4821a847
commit c8a14a29cd
2 changed files with 8 additions and 0 deletions
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3
lib/device/dev-ext-udev-constants.h
View File

@ -36,6 +36,9 @@
#define DEV_EXT_UDEV_DEVTYPE "DEVTYPE"
#define DEV_EXT_UDEV_DEVTYPE_DISK "disk"
/* the list of symlinks associated with device node */
#define DEV_EXT_UDEV_DEVLINKS "DEVLINKS"
/*
* DEV_EXT_UDEV_MPATH_DEVICE_PATH is set by multipath in udev db
* with value either 0 or 1. The same functionality as

5
lib/device/dev-type.c
View File

@ -1024,8 +1024,13 @@ int udev_dev_is_mpath_component(struct device *dev)
return 0;
}
#ifdef HAVE_LIBUDEV_UDEV_DEVICE_GET_IS_INITIALIZED
if ((initialized = udev_device_get_is_initialized(udev_device)))
break;
#else
if ((initialized = (udev_device_get_property_value(udev_device, DEV_EXT_UDEV_DEVLINKS) != NULL)))
break;
#endif
log_debug("Device %s not initialized in udev database (%u/%u, %u microseconds).", dev_name(dev),
i + 1, UDEV_DEV_IS_MPATH_COMPONENT_ITERATION_COUNT,