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Bugfixes, enhancements

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- Fixed an important bug with shadow object handling.
  When a shadow is dropped, if there are references left
  to it, both the object in front and dropped object becomes
  a shadow of the original object underneath. We had thought
  of this case but had not increase the shadow count.

- Added a test mechanism that tests the number of objects,
  vmfiles, shadows etc. by first counting them and trying to
  reach the same number by other means, i.e. per-object-shadow counts.
  It discovered a plethora of bugs.

- Added new set of functions to register objects, files and tasks
  globally with the pager, these functions introduce a refcount as
  well as adding structures to linked lists.

- fork/exit now seems to work stably i.e. no negative shadow counts etc.
This commit is contained in:
Bahadir Balban
2008-10-24 13:45:39 +03:00
parent b3693de21b
commit 651901d8b9
13 changed files with 384 additions and 146 deletions
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33
tasks/mm0/src/init.c
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@@ -16,6 +16,7 @@
#include <file.h>
#include <init.h>
#include <utcb.h>
#include <test.h>
/* A separate list than the generic file list that keeps just the boot files */
LIST_HEAD(boot_file_list);
@@ -50,13 +51,10 @@ int mm0_task_init(struct vm_file *f, unsigned long task_start,
return err;
/* Add the task to the global task list */
task_add_global(task);
global_add_task(task);
/* Add the file to global vm lists */
list_del_init(&f->list);
list_del_init(&f->vm_obj.list);
list_add(&f->list, &vm_file_list);
list_add(&f->vm_obj.list, &vm_object_list);
global_add_vm_file(f);
return 0;
}
@@ -78,13 +76,14 @@ struct vm_file *initdata_next_bootfile(struct initdata *initdata)
*/
int start_boot_tasks(struct initdata *initdata)
{
struct vm_file *file = 0, *fs0 = 0, *mm0 = 0, *n;
struct vm_file *file = 0, *fs0_file = 0, *mm0_file = 0, *n;
struct tcb *fs0_task;
struct svc_image *img;
struct task_ids ids;
struct list_head files;
struct list_head other_files;
int total = 0;
INIT_LIST_HEAD(&files);
INIT_LIST_HEAD(&other_files);
/* Separate out special server tasks and regular files */
do {
@@ -94,11 +93,11 @@ int start_boot_tasks(struct initdata *initdata)
BUG_ON(file->type != VM_FILE_BOOTFILE);
img = file->priv_data;
if (!strcmp(img->name, __PAGERNAME__))
mm0 = file;
mm0_file = file;
else if (!strcmp(img->name, __VFSNAME__))
fs0 = file;
fs0_file = file;
else
list_add(&file->list, &files);
list_add(&file->list, &other_files);
} else
break;
} while (1);
@@ -109,7 +108,7 @@ int start_boot_tasks(struct initdata *initdata)
ids.spid = PAGER_TID;
ids.tgid = PAGER_TID;
if (mm0_task_init(mm0, INITTASK_AREA_START, INITTASK_AREA_END, &ids) < 0)
if (mm0_task_init(mm0_file, INITTASK_AREA_START, INITTASK_AREA_END, &ids) < 0)
BUG();
total++;
@@ -119,18 +118,17 @@ int start_boot_tasks(struct initdata *initdata)
ids.tgid = VFS_TID;
printf("%s: Initialising fs0\n",__TASKNAME__);
if (task_exec(fs0, USER_AREA_START, USER_AREA_END, &ids) < 0)
BUG();
BUG_ON((IS_ERR(fs0_task = task_exec(fs0_file, USER_AREA_START, USER_AREA_END, &ids))));
total++;
/* Initialise other tasks */
list_for_each_entry_safe(file, n, &files, list) {
list_for_each_entry_safe(file, n, &other_files, list) {
printf("%s: Initialising new boot task.\n", __TASKNAME__);
ids.tid = TASK_ID_INVALID;
ids.spid = TASK_ID_INVALID;
ids.tgid = TASK_ID_INVALID;
if (task_exec(file, USER_AREA_START, USER_AREA_END, &ids) < 0)
BUG();
list_del_init(&file->list);
BUG_ON(IS_ERR(task_exec(file, USER_AREA_START, USER_AREA_END, &ids)));
total++;
}
@@ -189,6 +187,7 @@ void initialise(void)
start_boot_tasks(&initdata);
mm0_test_global_vm_integrity();
printf("%s: Initialised the memory/process manager.\n", __TASKNAME__);
}