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IBM AIX 5.3 Query (v_node hold count ?)

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Operating Systems AIX IBM AIX 5.3 Query (v_node hold count ?)
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Old 09-01-2006
IBM AIX 5.3 Query (v_node hold count ?)
Hi , I was reading AIX's Kernel Subsystem manual where I read about vn_hold, vn_rele, vn_lookup. I have few queries about them.

According to manual vn_hold "The vn_hold entry point increments the v_count field, the hold count on the v-node, and the v-node's underlying g-node (generic node). This incrementation assures that the v-node is not deallocated."
There are two different things v_count(or use count) and hold count in context of a v_node. What is the difference btw the two? How can I see a v_nodes hold count?
More in case of vn_lookup: "Passed dvp's use count is incrememted and vpp's hold count is incremented"
If in my code I do a vn_lookup() what is the counter part for this function? [like vn_hold() & vn_rele()]

Regards,
Dang
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LEARN ABOUT DEBIAN

vm_page_hold

VM_PAGE_HOLD(9) 					   BSD Kernel Developer's Manual					   VM_PAGE_HOLD(9)

NAME

     vm_page_hold, vm_page_unhold -- update a page's hold count

SYNOPSIS

     #include <sys/param.h>
     #include <vm/vm.h>
     #include <vm/vm_page.h>

     void
     vm_page_hold(vm_page_t m);

     void
     vm_page_unhold(vm_page_t m);

DESCRIPTION

     The vm_page_hold() function increases the hold count on a page.  This prevents the page daemon from freeing the page.

     vm_page_hold() should only be used for very temporary wiring of a page, as that page will not be considered for paging or reallocation for as
     long as its hold count is greater than zero.  Also note that while wired pages are removed from whatever queue they are on, vm_page_hold()
     does not affect the location of the page.	If it is on a queue prior to the call, it will still be there afterward.

     If the page needs to be held for a long period of time, vm_page_wire(9) should be used.

     vm_page_unhold() function reduces the hold count on a page.  If the hold count is zero it is possible that the page will be freed by the page
     daemon.

SEE ALSO

     vm_page_unwire(9), vm_page_wire(9)

AUTHORS

     This manual page was written by Chad David <davidc@acns.ab.ca>.

BSD
								   July 13, 2001							       BSD