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Diffstat (limited to 'Documentation/device-mapper/dm-uevent.txt')
| -rw-r--r-- | Documentation/device-mapper/dm-uevent.txt | 97 |
1 files changed, 0 insertions, 97 deletions
diff --git a/Documentation/device-mapper/dm-uevent.txt b/Documentation/device-mapper/dm-uevent.txt deleted file mode 100644 index 07edbd85c714..000000000000 --- a/Documentation/device-mapper/dm-uevent.txt +++ /dev/null @@ -1,97 +0,0 @@ -The device-mapper uevent code adds the capability to device-mapper to create -and send kobject uevents (uevents). Previously device-mapper events were only -available through the ioctl interface. The advantage of the uevents interface -is the event contains environment attributes providing increased context for -the event avoiding the need to query the state of the device-mapper device after -the event is received. - -There are two functions currently for device-mapper events. The first function -listed creates the event and the second function sends the event(s). - -void dm_path_uevent(enum dm_uevent_type event_type, struct dm_target *ti, - const char *path, unsigned nr_valid_paths) - -void dm_send_uevents(struct list_head *events, struct kobject *kobj) - - -The variables added to the uevent environment are: - -Variable Name: DM_TARGET -Uevent Action(s): KOBJ_CHANGE -Type: string -Description: -Value: Name of device-mapper target that generated the event. - -Variable Name: DM_ACTION -Uevent Action(s): KOBJ_CHANGE -Type: string -Description: -Value: Device-mapper specific action that caused the uevent action. - PATH_FAILED - A path has failed. - PATH_REINSTATED - A path has been reinstated. - -Variable Name: DM_SEQNUM -Uevent Action(s): KOBJ_CHANGE -Type: unsigned integer -Description: A sequence number for this specific device-mapper device. -Value: Valid unsigned integer range. - -Variable Name: DM_PATH -Uevent Action(s): KOBJ_CHANGE -Type: string -Description: Major and minor number of the path device pertaining to this -event. -Value: Path name in the form of "Major:Minor" - -Variable Name: DM_NR_VALID_PATHS -Uevent Action(s): KOBJ_CHANGE -Type: unsigned integer -Description: -Value: Valid unsigned integer range. - -Variable Name: DM_NAME -Uevent Action(s): KOBJ_CHANGE -Type: string -Description: Name of the device-mapper device. -Value: Name - -Variable Name: DM_UUID -Uevent Action(s): KOBJ_CHANGE -Type: string -Description: UUID of the device-mapper device. -Value: UUID. (Empty string if there isn't one.) - -An example of the uevents generated as captured by udevmonitor is shown -below. - -1.) Path failure. -UEVENT[1192521009.711215] change@/block/dm-3 -ACTION=change -DEVPATH=/block/dm-3 -SUBSYSTEM=block -DM_TARGET=multipath -DM_ACTION=PATH_FAILED -DM_SEQNUM=1 -DM_PATH=8:32 -DM_NR_VALID_PATHS=0 -DM_NAME=mpath2 -DM_UUID=mpath-35333333000002328 -MINOR=3 -MAJOR=253 -SEQNUM=1130 - -2.) Path reinstate. -UEVENT[1192521132.989927] change@/block/dm-3 -ACTION=change -DEVPATH=/block/dm-3 -SUBSYSTEM=block -DM_TARGET=multipath -DM_ACTION=PATH_REINSTATED -DM_SEQNUM=2 -DM_PATH=8:32 -DM_NR_VALID_PATHS=1 -DM_NAME=mpath2 -DM_UUID=mpath-35333333000002328 -MINOR=3 -MAJOR=253 -SEQNUM=1131 |