[PATCH] gentoo rule update for raid devices.

[elogind.git] / udev.8.in

diff --git a/udev.8.in b/udev.8.in
index dbba2979728f3f57ed0db18f030d0bc3ef549a7e..a246efdb45fbc0ea4d4d293a396eb5c9f95c5825 100644 (file)
--- a/udev.8.in
+++ b/udev.8.in
@@ -115,13 +115,17 @@ Match the kernel driver name.
 Match the device number on the bus, like PCI bus id.
 .TP
 .BI SYSFS{ filename }
-Match sysfs device attribute like label, vendor, USB serial number, SCSI UUID
-or file system label. Up to 5 different sysfs files can be checked, with
-all of the values being required to match the rule.
+Match sysfs device attribute like vendor and product id's, USB serial number
+or the SCSI disk model number. Up to 5 different sysfs files can be checked,
+with all of the values being required to match the rule.
 .br
 Trailing whitespace characters in the sysfs attribute value are ignored, if
 the key doesn't have any trailing whitespace characters by itself.
 .TP
+.BI ENV{ variable }
+Match an environment variable. Up to 5 different environment variables can be
+checked, with all of the values being required to match the rule.
+.TP
 .B PROGRAM
 Call external program. This key is valid if the program returns successful.
 The environment variables of
@@ -234,6 +238,14 @@ decimal integer N is substituted such that the resulting name doesn't
 match an existing device node. Otherwise nothing is substituted. This
 can be used to create compatibility symlinks and enumerate devices of
 the same type originating from different kernel subsystems.
+.sp
+Note: The use of the enumeration facility is unreliable outside of
+udevstart where the node creation is serialized and predictable.
+The returned numbers rely on the order devices are probed on the
+system. If more than one device requests an enumeration for the same
+name at the same time, it may be possible that both requests receive the
+same name back from the database. The use of enumerations in todays setups
+where device can come and go at any time is not recomended.
 .TP
 .B %%
 The '%' character itself.