zfs discuss - Mar 2008 - want to intercept all IO on ZFS file sytem

hi ,
i want to intercept IO on ZFS at vnode layer, i changed vnodeops pointer for zfs
in vfs frame work but i only get IO for creating new file but i dont get for
read,lookup,write,changing setattribute etc.

can somebody explain why ? and how can i achieve that?
similar thing works fine for vxfs and ufs on solaris.


regards
shriram


       
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shriram agarwal wrote:
> hi ,
> i want to intercept IO on ZFS at vnode layer, i changed vnodeops pointer
for zfs in vfs frame work but i only get IO for creating new file but i dont get
for read,lookup,write,changing setattribute etc.
> 
> can somebody explain why ? and how can i achieve that?
> similar thing works fine for vxfs and ufs on solaris.
Why ? What are you thring to do ?  The reason I ask is depending on what 
it is you want to do the vnode layer may not be the ideal place.

-- 
Darren J Moffat

> i want to intercept IO on ZFS at vnode layer,
> i changed vnodeops pointer for zfs in vfs frame work
> but i only get IO for creating new file but i dont
> get for read,lookup,write,changing setattribute
> etc. can somebody explain why ?
Which vnodeops pointer did you change?

ZFS, unlike most file systems, uses a separate dispatch vector for each type of
node. It sounds to me like you changed the directory dispatch vector (which
handles file creation) but not the file dispatch vector (which handles
operations on files).

(See the tail end of zfs_vnops.c for the declaration of the vectors.)
 
 
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