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Differential D20486 Diff 62032 head/sys/kern/kern_exec.c

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head/sys/kern/kern_exec.c

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#if VM_NRESERVLEVEL > 0 #if VM_NRESERVLEVEL > 0
vm_object_color(object, 0); vm_object_color(object, 0);
#endif #endif
ma[0] = vm_page_grab(object, 0, VM_ALLOC_NORMAL | VM_ALLOC_NOBUSY | ma[0] = vm_page_grab(object, 0, VM_ALLOC_NORMAL | VM_ALLOC_NOBUSY |
VM_ALLOC_WIRED); VM_ALLOC_WIRED);
if (ma[0]->valid != VM_PAGE_BITS_ALL) { if (ma[0]->valid != VM_PAGE_BITS_ALL) {
vm_page_xbusy(ma[0]); vm_page_xbusy(ma[0]);
if (!vm_pager_has_page(object, 0, NULL, &after)) { if (!vm_pager_has_page(object, 0, NULL, &after)) {
vm_page_lock(ma[0]);
vm_page_unwire_noq(ma[0]); vm_page_unwire_noq(ma[0]);
vm_page_free(ma[0]); vm_page_free(ma[0]);
vm_page_unlock(ma[0]);
VM_OBJECT_WUNLOCK(object); VM_OBJECT_WUNLOCK(object);
return (EIO); return (EIO);
} }
initial_pagein = min(after, VM_INITIAL_PAGEIN); initial_pagein = min(after, VM_INITIAL_PAGEIN);
KASSERT(initial_pagein <= object->size, KASSERT(initial_pagein <= object->size,
("%s: initial_pagein %d object->size %ju", ("%s: initial_pagein %d object->size %ju",
__func__, initial_pagein, (uintmax_t )object->size)); __func__, initial_pagein, (uintmax_t )object->size));
for (i = 1; i < initial_pagein; i++) { for (i = 1; i < initial_pagein; i++) {
if ((ma[i] = vm_page_next(ma[i - 1])) != NULL) { if ((ma[i] = vm_page_next(ma[i - 1])) != NULL) {
if (ma[i]->valid) if (ma[i]->valid)
break; break;
if (!vm_page_tryxbusy(ma[i])) if (!vm_page_tryxbusy(ma[i]))
break; break;
} else { } else {
ma[i] = vm_page_alloc(object, i, ma[i] = vm_page_alloc(object, i,
VM_ALLOC_NORMAL); VM_ALLOC_NORMAL);
if (ma[i] == NULL) if (ma[i] == NULL)
break; break;
} }
} }
initial_pagein = i; initial_pagein = i;
rv = vm_pager_get_pages(object, ma, initial_pagein, NULL, NULL); rv = vm_pager_get_pages(object, ma, initial_pagein, NULL, NULL);
if (rv != VM_PAGER_OK) { if (rv != VM_PAGER_OK) {
for (i = 0; i < initial_pagein; i++) { vm_page_unwire_noq(ma[0]);
vm_page_lock(ma[i]); for (i = 0; i < initial_pagein; i++)
if (i == 0)
vm_page_unwire_noq(ma[i]);
vm_page_free(ma[i]); vm_page_free(ma[i]);
vm_page_unlock(ma[i]);
}
VM_OBJECT_WUNLOCK(object); VM_OBJECT_WUNLOCK(object);
return (EIO); return (EIO);
} }
vm_page_xunbusy(ma[0]); vm_page_xunbusy(ma[0]);
for (i = 1; i < initial_pagein; i++) for (i = 1; i < initial_pagein; i++)
vm_page_readahead_finish(ma[i]); vm_page_readahead_finish(ma[i]);
} }
VM_OBJECT_WUNLOCK(object); VM_OBJECT_WUNLOCK(object);
imgp->firstpage = sf_buf_alloc(ma[0], 0); imgp->firstpage = sf_buf_alloc(ma[0], 0);
imgp->image_header = (char *)sf_buf_kva(imgp->firstpage); imgp->image_header = (char *)sf_buf_kva(imgp->firstpage);
return (0); return (0);
} }
void void
exec_unmap_first_page(struct image_params *imgp) exec_unmap_first_page(struct image_params *imgp)
{ {
vm_page_t m; vm_page_t m;
if (imgp->firstpage != NULL) { if (imgp->firstpage != NULL) {
m = sf_buf_page(imgp->firstpage); m = sf_buf_page(imgp->firstpage);
sf_buf_free(imgp->firstpage); sf_buf_free(imgp->firstpage);
imgp->firstpage = NULL; imgp->firstpage = NULL;
vm_page_lock(m);
vm_page_unwire(m, PQ_ACTIVE); vm_page_unwire(m, PQ_ACTIVE);
vm_page_unlock(m);
} }
} }
/* /*
* Destroy old address space, and allocate a new stack. * Destroy old address space, and allocate a new stack.
* The new stack is only sgrowsiz large because it is grown * The new stack is only sgrowsiz large because it is grown
* automatically on a page fault. * automatically on a page fault.
*/ */
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