Re: catch mount event

[Dean Roehrich <roehrich@sgi.com>]

>From:  "Francis Qu" <francis@raidzone.com>
>Hi there,
>
>In my DMAPI application, I'd like to catch the mount event of xfs file system.
> After init service and create session, I set DM_EVENT_MOUNT and dm_set_disp, 
>then I dm_get_events. Now the program is waiting for mount event to come.
>
>When I
>
>mount -o dmapi -t xfs /dev/xxx /mnt
>
>and it mounts, but the program doesn't catch the mount event.

Are you setting that mount event on the global handle?  
(DM_GLOBAL_HANP, DM_GLOBAL_HLEN)

In cmds/xfstests/dmapi there are dmapi test tools.  You can look at
src/suite1/cmd/set_disp.c to see how it sets the mount event using the global
handle.

Using those test tools, I can catch the mount event:

# dm_create_session
ret=0
newsid=1
# set_disp -s 1 -G DM_EVENT_MOUNT
# get_events -f 1
[now do your mount command, and the get_events will return...]
rlenp is 128
mount: token=9 sequence=9
        fs handle       0998cbba8d08fbb2
        mtpt handle     <BAD HANDLE, hlen 0>
        mtpt path       /mnts/dmi1
        media desig     ide0(3,12)
        root handle     0998cbba8d08fbb20e000000000000004000000000000000
        mode            0
# respond_event 1 9 1 0
[now the filesystem is mounted]

Dean