/*
* Caller must hold lock_page() or backend (otherwise, you may race
* with buffer fork or clear dirty)
*/
int tux3_set_buffer_dirty_list(struct address_space *mapping,
struct buffer_head *buffer, int delta,
struct list_head *head)
{
/* FIXME: we better to set this by caller? */
if (!buffer_uptodate(buffer))
set_buffer_uptodate(buffer);
/*
* Basically, open code of mark_buffer_dirty() without mark
* inode dirty. Caller decides whether dirty inode or not.
*/
if (!test_set_buffer_dirty(buffer)) {
struct page *page = buffer->b_page;
/* Mark dirty for delta, then add buffer to our dirty list */
__tux3_set_buffer_dirty_list(mapping, buffer, delta, head);
if (!TestSetPageDirty(page)) {
struct address_space *mapping = page->mapping;
if (mapping)
__tux3_set_page_dirty(page, mapping, 0);
return 1;
}
}
return 0;
}
static int tux3_set_page_dirty_buffers(struct page *page)
{
#if 0
struct address_space *mapping = page->mapping;
int newly_dirty;
spin_lock(&mapping->private_lock);
if (page_has_buffers(page)) {
struct buffer_head *head = page_buffers(page);
struct buffer_head *bh = head;
do {
set_buffer_dirty(bh);
bh = bh->b_this_page;
} while (bh != head);
}
newly_dirty = !TestSetPageDirty(page);
spin_unlock(&mapping->private_lock);
if (newly_dirty)
__set_page_dirty(page, mapping, 1);
return newly_dirty;
#else
struct address_space *mapping = page->mapping;
unsigned delta = tux3_get_current_delta();
struct buffer_head *head, *buffer;
int newly_dirty;
/* This should be tux3 page and locked */
assert(mapping);
assert(PageLocked(page));
/* This page should have buffers (caller should allocate) */
assert(page_has_buffers(page));
/*
* FIXME: we dirty all buffers on this page, so we optimize this
* by avoiding to check page-dirty/inode-dirty multiple times.
*/
newly_dirty = 0;
if (!TestSetPageDirty(page)) {
__tux3_set_page_dirty(page, mapping, 1);
newly_dirty = 1;
}
buffer = head = page_buffers(page);
do {
__tux3_mark_buffer_dirty(buffer, delta);
buffer = buffer->b_this_page;
} while (buffer != head);
#endif
return newly_dirty;
}