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Synchronize access to a vm page's valid field using the containing

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vm object's lock.
This commit is contained in:
Alan Cox 2003-10-04 21:35:48 +00:00
parent ccf78b6895
commit cbfbaad8be
1 changed files with 8 additions and 4 deletions
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12
sys/vm/vm_fault.c
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@ -889,8 +889,6 @@ RetryFault:;
*/
KASSERT(fs.m->flags & PG_BUSY,
("vm_fault: page %p not busy!", fs.m));
unlock_things(&fs);
/*
* Sanity check: page must be completely valid or it is not fit to
* map into user space. vm_pager_get_pages() ensures this.
@ -899,6 +897,8 @@ RetryFault:;
vm_page_zero_invalid(fs.m, TRUE);
printf("Warning: page %p partially invalid on fault\n", fs.m);
}
unlock_things(&fs);
pmap_enter(fs.map->pmap, vaddr, fs.m, prot, wired);
if (((fault_flags & VM_FAULT_WIRE_MASK) == 0) && (wired == 0)) {
vm_fault_prefault(fs.map->pmap, vaddr, fs.entry);
@ -994,12 +994,13 @@ vm_fault_prefault(pmap_t pmap, vm_offset_t addra, vm_map_entry_t entry)
VM_OBJECT_UNLOCK(lobject);
lobject = backing_object;
}
VM_OBJECT_UNLOCK(lobject);
/*
* give-up when a page is not in memory
*/
if (m == NULL)
if (m == NULL) {
VM_OBJECT_UNLOCK(lobject);
break;
}
vm_page_lock_queues();
if (((m->valid & VM_PAGE_BITS_ALL) == VM_PAGE_BITS_ALL) &&
(m->busy == 0) &&
@ -1010,11 +1011,14 @@ vm_fault_prefault(pmap_t pmap, vm_offset_t addra, vm_map_entry_t entry)
}
vm_page_busy(m);
vm_page_unlock_queues();
VM_OBJECT_UNLOCK(lobject);
mpte = pmap_enter_quick(pmap, addr, m, mpte);
VM_OBJECT_LOCK(lobject);
vm_page_lock_queues();
vm_page_wakeup(m);
}
vm_page_unlock_queues();
VM_OBJECT_UNLOCK(lobject);
}
}