fs: Convert writeback to XArray
A couple of short loops. Signed-off-by: Matthew Wilcox <willy@infradead.org>
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@ -339,9 +339,9 @@ static void inode_switch_wbs_work_fn(struct work_struct *work)
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struct address_space *mapping = inode->i_mapping;
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struct bdi_writeback *old_wb = inode->i_wb;
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struct bdi_writeback *new_wb = isw->new_wb;
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struct radix_tree_iter iter;
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XA_STATE(xas, &mapping->i_pages, 0);
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struct page *page;
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bool switched = false;
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void **slot;
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/*
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* By the time control reaches here, RCU grace period has passed
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@ -375,26 +375,19 @@ static void inode_switch_wbs_work_fn(struct work_struct *work)
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* to possibly dirty pages while PAGECACHE_TAG_WRITEBACK points to
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* pages actually under writeback.
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*/
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radix_tree_for_each_tagged(slot, &mapping->i_pages, &iter, 0,
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PAGECACHE_TAG_DIRTY) {
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struct page *page = radix_tree_deref_slot_protected(slot,
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&mapping->i_pages.xa_lock);
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if (likely(page) && PageDirty(page)) {
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xas_for_each_marked(&xas, page, ULONG_MAX, PAGECACHE_TAG_DIRTY) {
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if (PageDirty(page)) {
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dec_wb_stat(old_wb, WB_RECLAIMABLE);
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inc_wb_stat(new_wb, WB_RECLAIMABLE);
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}
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}
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radix_tree_for_each_tagged(slot, &mapping->i_pages, &iter, 0,
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PAGECACHE_TAG_WRITEBACK) {
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struct page *page = radix_tree_deref_slot_protected(slot,
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&mapping->i_pages.xa_lock);
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if (likely(page)) {
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xas_set(&xas, 0);
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xas_for_each_marked(&xas, page, ULONG_MAX, PAGECACHE_TAG_WRITEBACK) {
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WARN_ON_ONCE(!PageWriteback(page));
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dec_wb_stat(old_wb, WB_WRITEBACK);
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inc_wb_stat(new_wb, WB_WRITEBACK);
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}
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}
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wb_get(new_wb);
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