Re: Re: [Dazuko-help] Dazukofs

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Yes, fanotify is a good choice. But fanotify not support  watch descendant
directories.

On Thu, 2010-11-25 at 11:26 +0800, errik wrote:
> Hello Eric,
>
>        Here are some questions need your help.
>        As we know, fanotify is to replace inotify in current kernel.
> The problems are:
>        1. Can fanotify watch all the child directories recursively for
> one watched directory? Because inotify can't do this.

we can either watch:
1) a single inode
2) a directory and it's children (note: children, NOT descendants)
3) an entire mount point.
number 3 can be abused with bind mounting to watch descendants but takes
admin action and has some odd side effects...

>        2. Can fanotify block the file operations before fanotify send
> the event to application? Just do it like dazukofs.

Yes, for certain events this is possible (namely OPEN and READ)
-Eric

2011/2/15 John Ogness <[email protected]>

> On 2011-02-15, Tommy <[email protected]> wrote:
> > Will there be a dazukofs release that supports the 2.6.38-3- generic
> > Linux kernel? I believe the upcoming release of Ubuntu 11.04 will
> > feature the 2.6.38-3 kernel.
>
> It is not planned. For 2.6.38 you should switch to the official kernel
> API for file access control: fanotify.
>
> John Ogness
>
> --
> Dazuko Maintainer
>
> _______________________________________________
> Dazuko-devel mailing list
> [email protected]
> http://lists.nongnu.org/mailman/listinfo/dazuko-devel
>

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<div>Yes, fanotify is a good choice. But fanotify not support=A0 watch desc=
endant directories. </div>
<div>=A0</div>
<div>On Thu, 2010-11-25 at 11:26 +0800, errik wrote:<br>&gt; Hello Eric,<br=
>&gt;<br>&gt;=A0=A0=A0=A0=A0=A0=A0 Here are some questions need your help.<=
br>&gt;=A0=A0=A0=A0=A0=A0=A0 As we know, fanotify is to replace inotify in =
current kernel.<br>&gt; The problems are:<br>
&gt;=A0=A0=A0=A0=A0=A0=A0 1. Can fanotify watch all the child directories r=
ecursively for<br>&gt; one watched directory? Because inotify can&#39;t do =
this.</div>
<div><br>we can either watch:<br>1) a single inode<br>2) a directory and it=
&#39;s children (note: children, NOT descendants)<br>3) an entire mount poi=
nt.</div>
<div>number 3 can be abused with bind mounting to watch descendants but tak=
es<br>admin action and has some odd side effects...</div>
<div><br>&gt;=A0=A0=A0=A0=A0=A0=A0 2. Can fanotify block the file operation=
s before fanotify send<br>&gt; the event to application? Just do it like da=
zukofs.</div>
<div><br>Yes, for certain events this is possible (namely OPEN and READ)</d=
iv>
<div>-Eric<br><br></div>
<div class=3D"gmail_quote">2011/2/15 John Ogness <span dir=3D"ltr">&lt;<a h=
ref=3D"mailto:[email protected]">[email protected]</a>&gt;</span>=
<br>
<blockquote style=3D"BORDER-LEFT: #ccc 1px solid; MARGIN: 0px 0px 0px 0.8ex=
; PADDING-LEFT: 1ex" class=3D"gmail_quote">On 2011-02-15, Tommy &lt;<a href=
=3D"mailto:[email protected]">[email protected]</a>&gt; wrote:<br>&=
gt; Will there be a dazukofs release that supports the 2.6.38-3- generic<br=
>
&gt; Linux kernel? I believe the upcoming release of Ubuntu 11.04 will<br>&=
gt; feature the 2.6.38-3 kernel.<br><br>It is not planned. For 2.6.38 you s=
hould switch to the official kernel<br>API for file access control: fanotif=
y.<br>
<br>John Ogness<br><font color=3D"#888888"><br>--<br>Dazuko Maintainer<br><=
br>_______________________________________________<br>Dazuko-devel mailing =
list<br><a href=3D"mailto:[email protected]">[email protected]<=
/a><br>
<a href=3D"http://lists.nongnu.org/mailman/listinfo/dazuko-devel" target=3D=
"_blank">http://lists.nongnu.org/mailman/listinfo/dazuko-devel</a><br></fon=
t></blockquote></div><br>

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