101 lines
1.9 KiB
C
101 lines
1.9 KiB
C
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/malloc.h>
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#include <vm/vm.h>
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#include <vm/vm_pager.h>
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#include <vm/vm_page.h>
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#include <vm/default_pager.h>
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#include <vm/swap_pager.h>
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/*
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* pagerops for OBJT_DEFAULT - "default pager".
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*/
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struct pagerops defaultpagerops = {
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NULL,
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default_pager_alloc,
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default_pager_dealloc,
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default_pager_getpages,
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default_pager_putpages,
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default_pager_haspage,
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NULL
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};
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/*
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* no_pager_alloc just returns an initialized object.
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*/
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vm_object_t
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default_pager_alloc(handle, size, prot, offset)
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void *handle;
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register vm_size_t size;
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vm_prot_t prot;
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vm_offset_t offset;
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{
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if (handle != NULL)
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panic("default_pager_alloc: handle specified");
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return vm_object_allocate(OBJT_DEFAULT, offset + size);
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}
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void
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default_pager_dealloc(object)
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vm_object_t object;
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{
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/*
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* OBJT_DEFAULT objects have no special resources allocated to them.
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*/
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}
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/*
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* The default pager has no backing store, so we always return
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* failure.
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*/
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int
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default_pager_getpages(object, m, count, reqpage)
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vm_object_t object;
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vm_page_t *m;
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int count;
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int reqpage;
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{
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return VM_PAGER_FAIL;
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}
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int
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default_pager_putpages(object, m, c, sync, rtvals)
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vm_object_t object;
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vm_page_t *m;
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int c;
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boolean_t sync;
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int *rtvals;
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{
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int i;
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/*
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* Try to convert the object type into a OBJT_SWAP.
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* If the swp structure allocation fails, convert it
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* back to OBJT_DEFAULT and return failure. Otherwise
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* pass this putpages to the swap pager.
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*/
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object->type = OBJT_SWAP;
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if (swap_pager_swp_alloc(object, M_KERNEL) != 0) {
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object->type = OBJT_DEFAULT;
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for (i = 0; i < c; i++)
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rtvals[i] = VM_PAGER_FAIL;
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return VM_PAGER_FAIL;
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}
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return swap_pager_putpages(object, m, c, sync, rtvals);
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}
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boolean_t
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default_pager_haspage(object, offset, before, after)
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vm_object_t object;
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vm_offset_t offset;
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int *before;
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int *after;
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{
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return FALSE;
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}
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