On Sat, 14 Apr 2018 00:00:09 +0200 Martin Wilck <mwilck@xxxxxxxx> wrote: > In "find_multipaths smart" mode, use time stamps under > /dev/shm/multipath/find_multipaths to track waiting for multipath > siblings. When a path is first encountered and is "maybe" multipath, > create a file under /dev/shm, set its modification time to the expiry > time of the timer, and set the FIND_MULTIPATHS_WAIT_UNTIL variable. > On later calls, also set FIND_MULTIPATHS_WAIT_UNTIL to the expiry > time (but don't change the time stamp) if it's not expired yet, or 0 > if it is expired. Set FIND_MULTIPATHS_WAIT_UNTIL even if enough > evidence becomes available to decide if the path needs to be > multipathed - this enables the udev rules to detect that this is a > device a timer has been started for, and stop it. By using /dev/shm, > we share information about "smart" timers between initrd and root > file system, and thus only calculate the timeout once. > > Because we use major:minor to identify the devices in /dev/shm, and > because a removed device might be replaced by a different one with > the same major/minor number, add a rule to multipath.rules to remove > the find_multipaths marker on remove uevents. > > Signed-off-by: Martin Wilck <mwilck@xxxxxxxx> > --- > libmultipath/file.c | 2 +- > libmultipath/file.h | 1 + > multipath/main.c | 132 > ++++++++++++++++++++++++++++++++++++++++++++++ > multipath/multipath.rules | 4 +- 4 files changed, 137 > insertions(+), 2 deletions(-) > Reviewed-by: Hannes Reinecke <hare@xxxxxxxx> Cheers, Hannes -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
