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Made changes to have shared tcb parts in fs0 in preparation for clone()

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fs_data and files structures can now be shared in the vfs task.
Currently no means to free shared structures in tcb destruction. Need to add that.
This commit is contained in:
Bahadir Balban
2008-11-09 10:07:24 +02:00
parent 5468c1833d
commit 63fb907cd0
13 changed files with 189 additions and 78 deletions
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7
tasks/mm0/src/clone.c
View File

@@ -18,7 +18,7 @@
/*
* Sends vfs task information about forked child, and its utcb
*/
int vfs_notify_fork(struct tcb *child, struct tcb *parent)
int vfs_notify_fork(struct tcb *child, struct tcb *parent, unsigned int flags)
{
int err = 0;
@@ -30,6 +30,7 @@ int vfs_notify_fork(struct tcb *child, struct tcb *parent)
write_mr(L4SYS_ARG0, parent->tid);
write_mr(L4SYS_ARG1, child->tid);
write_mr(L4SYS_ARG2, (unsigned int)child->utcb);
write_mr(L4SYS_ARG3, flags);
if ((err = l4_sendrecv(VFS_TID, VFS_TID,
L4_IPC_TAG_NOTIFY_FORK)) < 0) {
@@ -86,7 +87,7 @@ int sys_fork(struct tcb *parent)
// printf("Mapped 0x%p to vfs as utcb of %d\n", child->utcb, child->tid);
/* We can now notify vfs about forked process */
vfs_notify_fork(child, parent);
vfs_notify_fork(child, parent, TCB_NO_SHARING);
/* Add child to global task list */
global_add_task(child);
@@ -120,7 +121,7 @@ int sys_clone(struct tcb *parent, void *child_stack, unsigned int flags)
child->stack_start = 0;
/* We can now notify vfs about forked process */
vfs_notify_fork(child, parent);
vfs_notify_fork(child, parent, TCB_SHARED_FILES);
/* Add child to global task list */
global_add_task(child);

3
tasks/mm0/src/munmap.c
View File

@@ -167,6 +167,9 @@ int vma_flush_pages(struct vm_area *vma)
* Unmaps the given virtual address range from the task, the region
* may span into zero or more vmas, and may involve shrinking, splitting
* and destruction of multiple vmas.
*
* NOTE: Shared object addresses are returned back to their pools when
* such objects are deleted, and not via this function.
*/
int do_munmap(struct tcb *task, unsigned long vaddr, unsigned long npages)
{