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Added VM_DIRTY flag for file-backed objects and their pages.

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Now file flushing in both munmap() and fsync() caters for VM_DIRTY.
Also write_cache_pages() and write faults set this bit on pages and their objects.
This commit is contained in:
Bahadir Balban
2008-10-30 11:09:15 +02:00
parent 13b1b405a5
commit a2d2574eac
4 changed files with 20 additions and 4 deletions
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4
tasks/mm0/include/vm_area.h
View File

@@ -51,8 +51,8 @@ enum VM_FILE_TYPE {
};
/* Defines the type of object. A file? Just a standalone object? */
#define VM_OBJ_SHADOW (1 << 8) /* Anonymous pages, swap_pager */
#define VM_OBJ_FILE (1 << 9) /* VFS file and device pages */
#define VM_OBJ_SHADOW (1 << 10) /* Anonymous pages, swap_pager */
#define VM_OBJ_FILE (1 << 11) /* VFS file and device pages */
struct page {
int refcnt; /* Refcount */

8
tasks/mm0/src/fault.c
View File

@@ -677,7 +677,13 @@ int __do_page_fault(struct fault_data *fault)
BUG();
}
}
BUG_ON(!page);
/*
* Page and object are now dirty. Currently it's
* only relevant for file-backed shared objects.
*/
page->flags |= VM_DIRTY;
page->owner->flags |= VM_DIRTY;
} else
BUG();
}

7
tasks/mm0/src/file.c
View File

@@ -338,6 +338,13 @@ int write_file_pages(struct vm_file *f, unsigned long pfn_start,
{
int err;
/* We have only thought of vfs files for this */
BUG_ON(f->type != VM_FILE_VFS);
/* Need not flush files that haven't been written */
if (!(f->vm_obj.flags & VM_DIRTY))
return 0;
BUG_ON(pfn_end != __pfn(page_align_up(f->length)));
for (int f_offset = pfn_start; f_offset < pfn_end; f_offset++) {
err = f->vm_obj.pager->ops.page_out(&f->vm_obj, f_offset);

5
tasks/mm0/src/munmap.c
View File

@@ -90,7 +90,6 @@ int vma_flush_pages(struct vm_area *vma)
int err;
/* Read-only vmas need not flush objects */
/* FIXME: Ensure pf_handler sets VM_DIRTY on write-faulted pages */
if (!(vma->flags & VM_WRITE))
return 0;
@@ -101,6 +100,10 @@ int vma_flush_pages(struct vm_area *vma)
BUG_ON(list_empty(&vma->list));
vmo = list_entry(vma->list.next, struct vm_object, list);
/* Only dirty objects would need flushing */
if (!(vmo->flags & VM_DIRTY))
return 0;
/* Only vfs file objects are flushed */
if (vmo->flags & VM_OBJ_FILE &&
vmo->flags & VMA_SHARED &&