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Code Issues Releases Activity

Lock the destination object in vm_fault_copy_entry().

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This commit is contained in:
Alan Cox 2003-10-08 07:11:19 +00:00
parent 669890eaeb
commit 8afcf0cc36
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=120905
1 changed files with 7 additions and 2 deletions
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9
sys/vm/vm_fault.c
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@ -1147,6 +1147,7 @@ vm_fault_copy_entry(dst_map, src_map, dst_entry, src_entry)
dst_object = vm_object_allocate(OBJT_DEFAULT,
(vm_size_t) OFF_TO_IDX(dst_entry->end - dst_entry->start));
VM_OBJECT_LOCK(dst_object);
dst_entry->object.vm_object = dst_object;
dst_entry->offset = 0;
@ -1168,7 +1169,9 @@ vm_fault_copy_entry(dst_map, src_map, dst_entry, src_entry)
dst_m = vm_page_alloc(dst_object,
OFF_TO_IDX(dst_offset), VM_ALLOC_NORMAL);
if (dst_m == NULL) {
VM_OBJECT_UNLOCK(dst_object);
VM_WAIT;
VM_OBJECT_LOCK(dst_object);
}
} while (dst_m == NULL);
@ -1180,17 +1183,18 @@ vm_fault_copy_entry(dst_map, src_map, dst_entry, src_entry)
VM_OBJECT_LOCK(src_object);
src_m = vm_page_lookup(src_object,
OFF_TO_IDX(dst_offset + src_offset));
VM_OBJECT_UNLOCK(src_object);
if (src_m == NULL)
panic("vm_fault_copy_wired: page missing");
pmap_copy_page(src_m, dst_m);
VM_OBJECT_UNLOCK(src_object);
dst_m->valid = VM_PAGE_BITS_ALL;
VM_OBJECT_UNLOCK(dst_object);
/*
* Enter it in the pmap...
*/
pmap_enter(dst_map->pmap, vaddr, dst_m, prot, FALSE);
VM_OBJECT_LOCK(dst_object);
vm_page_lock_queues();
vm_page_flag_set(dst_m, PG_WRITEABLE);
@ -1201,6 +1205,7 @@ vm_fault_copy_entry(dst_map, src_map, dst_entry, src_entry)
vm_page_wakeup(dst_m);
vm_page_unlock_queues();
}
VM_OBJECT_UNLOCK(dst_object);
}