| 74 | } |
| 75 | |
| 76 | vm_object_t |
| 77 | phys_pager_allocate(void *handle, struct phys_pager_ops *ops, void *data, |
| 78 | vm_ooffset_t size, vm_prot_t prot, vm_ooffset_t foff, struct ucred *cred) |
| 79 | { |
| 80 | vm_object_t object, object1; |
| 81 | vm_pindex_t pindex; |
| 82 | bool init; |
| 83 | |
| 84 | /* |
| 85 | * Offset should be page aligned. |
| 86 | */ |
| 87 | if (foff & PAGE_MASK) |
| 88 | return (NULL); |
| 89 | |
| 90 | pindex = OFF_TO_IDX(foff + PAGE_MASK + size); |
| 91 | init = true; |
| 92 | |
| 93 | if (handle != NULL) { |
| 94 | mtx_lock(&phys_pager_mtx); |
| 95 | /* |
| 96 | * Look up pager, creating as necessary. |
| 97 | */ |
| 98 | object1 = NULL; |
| 99 | object = vm_pager_object_lookup(&phys_pager_object_list, handle); |
| 100 | if (object == NULL) { |
| 101 | /* |
| 102 | * Allocate object and associate it with the pager. |
| 103 | */ |
| 104 | mtx_unlock(&phys_pager_mtx); |
| 105 | object1 = vm_object_allocate(OBJT_PHYS, pindex); |
| 106 | mtx_lock(&phys_pager_mtx); |
| 107 | object = vm_pager_object_lookup(&phys_pager_object_list, |
| 108 | handle); |
| 109 | if (object != NULL) { |
| 110 | /* |
| 111 | * We raced with other thread while |
| 112 | * allocating object. |
| 113 | */ |
| 114 | if (pindex > object->size) |
| 115 | object->size = pindex; |
| 116 | init = false; |
| 117 | } else { |
| 118 | object = object1; |
| 119 | object1 = NULL; |
| 120 | object->handle = handle; |
| 121 | object->un_pager.phys.ops = ops; |
| 122 | object->un_pager.phys.data_ptr = data; |
| 123 | if (ops->phys_pg_populate != NULL) |
| 124 | vm_object_set_flag(object, OBJ_POPULATE); |
| 125 | TAILQ_INSERT_TAIL(&phys_pager_object_list, |
| 126 | object, pager_object_list); |
| 127 | } |
| 128 | } else { |
| 129 | if (pindex > object->size) |
| 130 | object->size = pindex; |
| 131 | } |
| 132 | mtx_unlock(&phys_pager_mtx); |
| 133 | vm_object_deallocate(object1); |
no test coverage detected