zfs discuss - Nov 2008 - free space function

when and how is fop_space function called?
What is the system call trace? Actually wanted to get the flow of system calls
generated for the function call zfs_space. Have traced it back till fop_space(or
vop_space?)
Can anyone please explain?
Thanks in advance.
-- 
This message posted from opensolaris.org

On 11/13/08 12:27, kavita wrote:
> when and how is fop_space function called?
> What is the system call trace? Actually wanted to get the flow of system
calls generated for the function call zfs_space. Have traced it back till
fop_space(or vop_space?)
> Can anyone please explain?
>   
VOP_SPACE is the VOP interface for allocating/freeing data blocks 
into/from a file.
Please see fcntl(2) specifically the F_FREESP and F_ALLOCSP cmd values 
for the fcntl call.
zfs_space is a kernel function call. To trace the flow of calls from 
zfs_space you would need to use dtrace(1M).

Pramod