buffer_check_dirty

Name:Returns if the page has dirty or writeback buffers. If all the buffers* are unlocked and clean then the PageDirty information is stale. If* any of the pages are locked, it is assumed they are locked for IO.

Proto:void buffer_check_dirty_writeback(struct page *page, bool *dirty, bool *writeback)

Type:void

Parameter:

Type	Parameter	Name
struct page *	page
bool *	dirty
bool *	writeback

* dirty = false

* writeback = false

BUG_ON(!PageLocked(page))

If Not page_has_buffers(page) Then Return

If Only test-and-set exist for PG_writeback. The unconditional operators are* risky: they bypass page accounting. Then * writeback = true

101

head = If we *know* page->private refers to buffer_heads (page)

102

bh = head

103

104

If buffer_locked(bh) Then * writeback = true

107

If buffer_dirty(bh) Then * dirty = true

110

bh = circular list of page's buffers

111

When bh != head cycle

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