diff options
Diffstat (limited to 'vm/vm_fault.c')
| -rw-r--r-- | vm/vm_fault.c | 39 |
1 files changed, 30 insertions, 9 deletions
diff --git a/vm/vm_fault.c b/vm/vm_fault.c index 46779f6..101ebce 100644 --- a/vm/vm_fault.c +++ b/vm/vm_fault.c @@ -229,6 +229,17 @@ vm_fault_return_t vm_fault_page( boolean_t look_for_page; vm_prot_t access_required; + /* We need to unlock an object before making requests to a + memory manager. We use this object to temporarily store + object attributes needed for the request to avoid accessing + the object while it is unlocked. */ + struct + { + struct ipc_port * pager; + pager_request_t pager_request; + vm_offset_t paging_offset; + } obj; + if (resume) { vm_fault_state_t *state = (vm_fault_state_t *) current_thread()->ith_other; @@ -510,11 +521,16 @@ vm_fault_return_t vm_fault_page( new_unlock_request = m->unlock_request = (access_required | m->unlock_request); + obj.pager = object->pager; + obj.pager_request = + object->pager_request; + obj.paging_offset = + object->paging_offset; vm_object_unlock(object); if ((rc = memory_object_data_unlock( - object->pager, - object->pager_request, - offset + object->paging_offset, + obj.pager, + obj.pager_request, + offset + obj.paging_offset, PAGE_SIZE, new_unlock_request)) != KERN_SUCCESS) { @@ -633,6 +649,11 @@ vm_fault_return_t vm_fault_page( m->absent = TRUE; object->absent_count++; + /* Save attributes for the request. */ + obj.pager = object->pager; + obj.pager_request = object->pager_request; + obj.paging_offset = object->paging_offset; + /* * We have a busy page, so we can * release the object lock. @@ -647,16 +668,16 @@ vm_fault_return_t vm_fault_page( vm_stat_sample(SAMPLED_PC_VM_PAGEIN_FAULTS); current_task()->pageins++; - if ((rc = memory_object_data_request(object->pager, - object->pager_request, - m->offset + object->paging_offset, + if ((rc = memory_object_data_request(obj.pager, + obj.pager_request, + m->offset + obj.paging_offset, PAGE_SIZE, access_required)) != KERN_SUCCESS) { if (rc != MACH_SEND_INTERRUPTED) printf("%s(0x%p, 0x%p, 0x%lx, 0x%x, 0x%x) failed, %x\n", "memory_object_data_request", - object->pager, - object->pager_request, - m->offset + object->paging_offset, + obj.pager, + obj.pager_request, + m->offset + obj.paging_offset, PAGE_SIZE, access_required, rc); /* * Don't want to leave a busy page around, |