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drasko |
/*
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* These functions here do run-time checks on all fields
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* of tasks, vmas, and vm objects to see that they
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* have expected values.
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*
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* Copyright (C) 2008 Bahadir Balban
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*/
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#include <vm_area.h>
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#include <mmap.h>
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#include <shm.h>
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#include <globals.h>
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struct vm_statistics {
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int tasks; /* All tasks counted on the system */
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int vm_objects; /* All objects counted on the system */
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int shadow_objects; /* Shadows counted by hand (well almost!) */
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int shadows_referred; /* Shadows that objects say they have */
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int file_objects; /* Objects that are found to be files */
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int vm_files; /* All files counted on the system */
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int shm_files; /* SHM files counted */
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int boot_files; /* Boot files counted */
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int vfs_files; /* VFS files counted */
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int devzero; /* Devzero count, must be 1 */
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};
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/* Count links in objects link list, and compare with nlinks */
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int vm_object_test_link_count(struct vm_object *vmo)
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{
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int links = 0;
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struct vm_obj_link *l;
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list_foreach_struct(l, &vmo->link_list, linkref)
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links++;
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BUG_ON(links != vmo->nlinks);
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return 0;
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}
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int vm_object_test_shadow_count(struct vm_object *vmo)
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{
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struct vm_object *sh;
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int shadows = 0;
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list_foreach_struct(sh, &vmo->shdw_list, shref)
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shadows++;
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BUG_ON(shadows != vmo->shadows);
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return 0;
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}
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/* TODO:
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* Add checking that total open file descriptors are
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* equal to total opener count of all files
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*/
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#if defined (DEBUG_FAULT_HANDLING)
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int mm0_test_global_vm_integrity(void)
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{
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struct tcb *task;
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struct vm_object *vmo;
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struct vm_statistics vmstat;
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struct vm_file *f;
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memset(&vmstat, 0, sizeof(vmstat));
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/* Count all shadow and file objects */
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list_foreach_struct(vmo, &global_vm_objects.list, list) {
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vmstat.shadows_referred += vmo->shadows;
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if (vmo->flags & VM_OBJ_SHADOW)
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vmstat.shadow_objects++;
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if (vmo->flags & VM_OBJ_FILE)
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vmstat.file_objects++;
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vmstat.vm_objects++;
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vm_object_test_shadow_count(vmo);
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vm_object_test_link_count(vmo);
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}
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/* Count all registered vmfiles */
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list_foreach_struct(f, &global_vm_files.list, list) {
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vmstat.vm_files++;
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if (f->type == VM_FILE_SHM)
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vmstat.shm_files++;
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else if (f->type == VM_FILE_VFS)
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vmstat.vfs_files++;
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else if (f->type == VM_FILE_DEVZERO)
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vmstat.devzero++;
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else BUG();
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}
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if (vmstat.vm_files != global_vm_files.total) {
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printf("Total counted files don't match "
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"global_vm_files total\n");
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BUG();
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}
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if (vmstat.vm_objects != global_vm_objects.total) {
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printf("Total counted vm_objects don't "
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"match global_vm_objects total\n");
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BUG();
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}
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/* Total file objects must be equal to total vm files */
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if (vmstat.vm_files != vmstat.file_objects) {
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printf("\nTotal files don't match total file objects.\n");
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printf("vm files:\n");
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vm_print_files(&global_vm_files.list);
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printf("\nvm objects:\n");
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vm_print_objects(&global_vm_objects.list);
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printf("\n");
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BUG();
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}
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/* Counted and referred shadows must match */
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BUG_ON(vmstat.shadow_objects != vmstat.shadows_referred);
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/* Count all tasks */
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list_foreach_struct(task, &global_tasks.list, list)
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vmstat.tasks++;
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if (vmstat.tasks != global_tasks.total) {
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printf("Total counted tasks don't match global_tasks total\n");
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BUG();
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}
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return 0;
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}
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#else /* End of DEBUG_FAULT_HANDLING */
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int mm0_test_global_vm_integrity(void) { return 0; }
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#endif /* End of !DEBUG_FAULT_HANDLING */
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