inotify and IN_UNMOUNT-events

inotify and IN_UNMOUNT-events

[Juergen Quade]

Playing around with inotify I have some problems
to generate/receive IN_UNMOUNT-events (using
a self written application and inotify_utils-0.25;
kernel 2.6.13).

Doing:
- mount /dev/hda1 /mnt
- add a watch to the path /mnt/ ("./inotify_test /mnt")
- umount /mnt

results in two events:
1. IN_DELETE_SELF (mask=0x0400)
2. IN_IGNORED     (mask=0x8000)

Any ideas?

         Juergen.

Re: inotify and IN_UNMOUNT-events

[Robert Love]

On Tue, 2005-08-30 at 21:46 +0200, Juergen Quade wrote:
> Playing around with inotify I have some problems
> to generate/receive IN_UNMOUNT-events (using
> a self written application and inotify_utils-0.25;
> kernel 2.6.13).
> 
> Doing:
> - mount /dev/hda1 /mnt
> - add a watch to the path /mnt/ ("./inotify_test /mnt")
> - umount /mnt
> 
> results in two events:
> 1. IN_DELETE_SELF (mask=0x0400)
> 2. IN_IGNORED     (mask=0x8000)
> 
> Any ideas?

"/mnt" is not unmounted, stuff inside of it is.

Watch, say, "/mnt/foo/bar" and when /dev/hda1 is unmounted, you will get
an IN_UNMOUNT on the watch.

	Robert Love

Re: inotify and IN_UNMOUNT-events

[Kyle Moffett]

On Aug 30, 2005, at 23:33:27, Robert Love wrote:
> On Tue, 2005-08-30 at 21:46 +0200, Juergen Quade wrote:
>
>> Playing around with inotify I have some problems
>> to generate/receive IN_UNMOUNT-events (using
>> a self written application and inotify_utils-0.25;
>> kernel 2.6.13).
>>
>> Doing:
>> - mount /dev/hda1 /mnt
>> - add a watch to the path /mnt/ ("./inotify_test /mnt")
>> - umount /mnt
>>
>> results in two events:
>> 1. IN_DELETE_SELF (mask=0x0400)
>> 2. IN_IGNORED     (mask=0x8000)
>>
>> Any ideas?
>
> "/mnt" is not unmounted, stuff inside of it is.
>
> Watch, say, "/mnt/foo/bar" and when /dev/hda1 is unmounted, you  
> will get
> an IN_UNMOUNT on the watch.

I think this might work as well:
# mount /dev/hda1 /mnt
# ./inotify_test /mnt/. &
# umount /mnt

That should get the effect you are looking for

Cheers,
Kyle Moffett

--
I have yet to see any problem, however complicated, which, when you  
looked at
it in the right way, did not become still more complicated.
   -- Poul Anderson

Re: inotify and IN_UNMOUNT-events

[Juergen Quade]

> > ...
> > results in two events:
> > 1. IN_DELETE_SELF (mask=0x0400)
> > 2. IN_IGNORED     (mask=0x8000)
> > 
> > Any ideas?
> 
> "/mnt" is not unmounted, stuff inside of it is.
> 
> Watch, say, "/mnt/foo/bar" and when /dev/hda1 is unmounted, you will get
> an IN_UNMOUNT on the watch.

I tried that too. Seems not to work (at least for me):

	root@mobil:/tmp/inotify-utils-0.25 # mount /dev/hda6 /mnt
	root@mobil:/tmp/inotify-utils-0.25 # ls /mnt/foo/bar
	/mnt/foo/bar
	root@mobil:/tmp/inotify-utils-0.25 # ./inotify_test /mnt/foo/bar &
	inotify device fd = 3
	/mnt/foo/bar WD=1
	[1] 8454
	root@mobil:/tmp/inotify-utils-0.25 # umount /dev/hda6
	read = 32
	sizeof inotify_event = 16
	pevent->len = 0
	pevent->len = 0
	EVENT ON WD=1
	DELETE_SELF (file) 0x00000400

	EVENT ON WD=1
	IGNORED (file) 0x00008000

	root@mobil:/tmp/inotify-utils-0.25 #

  Juergen.