From: Matthew Wilcox <mawil...@microsoft.com>
A couple of short loops.
Signed-off-by: Matthew Wilcox <mawil...@microsoft.com>
---
fs/fs-writeback.c | 27 ++++++++++-----------------
1 file changed, 10 insertions(+), 17 deletions(-)
diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c
index a3c2352507f6..18ad86ccba96 100644
--- a/fs/fs-writeback.c
+++ b/fs/fs-writeback.c
@@ -339,9 +339,9 @@ static void inode_switch_wbs_work_fn(struct work_struct
*work)
struct address_space *mapping = inode->i_mapping;
struct bdi_writeback *old_wb = inode->i_wb;
struct bdi_writeback *new_wb = isw->new_wb;
- struct radix_tree_iter iter;
+ XA_STATE(xas, &mapping->pages, 0);
+ struct page *page;
bool switched = false;
- void **slot;
/*
* By the time control reaches here, RCU grace period has passed
@@ -373,27 +373,20 @@ static void inode_switch_wbs_work_fn(struct work_struct
*work)
/*
* Count and transfer stats. Note that PAGECACHE_TAG_DIRTY points
* to possibly dirty pages while PAGECACHE_TAG_WRITEBACK points to
- * pages actually under underwriteback.
+ * pages actually under writeback.
*/
- radix_tree_for_each_tagged(slot, &mapping->pages, &iter, 0,
- PAGECACHE_TAG_DIRTY) {
- struct page *page = radix_tree_deref_slot_protected(slot,
- &mapping->pages.xa_lock);
- if (likely(page) && PageDirty(page)) {
+ xas_for_each_tag(&xas, page, ULONG_MAX, PAGECACHE_TAG_DIRTY) {
+ if (PageDirty(page)) {
dec_wb_stat(old_wb, WB_RECLAIMABLE);
inc_wb_stat(new_wb, WB_RECLAIMABLE);
}
}
- radix_tree_for_each_tagged(slot, &mapping->pages, &iter, 0,
- PAGECACHE_TAG_WRITEBACK) {
- struct page *page = radix_tree_deref_slot_protected(slot,
- &mapping->pages.xa_lock);
- if (likely(page)) {
- WARN_ON_ONCE(!PageWriteback(page));
- dec_wb_stat(old_wb, WB_WRITEBACK);
- inc_wb_stat(new_wb, WB_WRITEBACK);
- }
+ xas_set(&xas, 0);
+ xas_for_each_tag(&xas, page, ULONG_MAX, PAGECACHE_TAG_WRITEBACK) {
+ WARN_ON_ONCE(!PageWriteback(page));
+ dec_wb_stat(old_wb, WB_WRITEBACK);
+ inc_wb_stat(new_wb, WB_WRITEBACK);
}
wb_get(new_wb);
--
2.15.0
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