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Remove some unnecessary actions by the zero-copy setup and teardown code.

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Remove an incorrect comment.  (Incrementing an object's reference count
does not prevent a process from exiting.  The real concern here is that the
physical page must not be deleted until transmission is complete.  That is
already handled by the VM system and sf_buf_free().)

Tested by:	ken
This commit is contained in:
alc 2003-03-09 20:38:56 +00:00
parent e70feef239
commit 3a50d97c5c
1 changed files with 1 additions and 10 deletions
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11
sys/kern/uipc_cow.c
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@ -87,19 +87,15 @@ socow_iodone(void *addr, void *args)
{ {
int s; int s;
struct sf_buf *sf; struct sf_buf *sf;
vm_offset_t paddr;
vm_page_t pp; vm_page_t pp;
sf = dtosf(addr); sf = dtosf(addr);
paddr = vtophys((vm_offset_t)addr); pp = sf->m;
pp = PHYS_TO_VM_PAGE(paddr);
s = splvm(); s = splvm();
/* remove COW mapping */ /* remove COW mapping */
vm_page_lock_queues(); vm_page_lock_queues();
vm_page_cowclear(pp); vm_page_cowclear(pp);
vm_page_unlock_queues(); vm_page_unlock_queues();
vm_object_deallocate(pp->object);
splx(s); splx(s);
/* note that sf_buf_free() unwires the page for us*/ /* note that sf_buf_free() unwires the page for us*/
sf_buf_free(addr, NULL); sf_buf_free(addr, NULL);
@ -152,11 +148,6 @@ socow_setup(struct mbuf *m0, struct uio *uio)
vm_page_wire(pp); vm_page_wire(pp);
vm_page_unlock_queues(); vm_page_unlock_queues();
/*
* prevent the process from exiting on us.
*/
vm_object_reference(pp->object);
/* /*
* attach to mbuf * attach to mbuf
*/ */