linux-ext4 - [PATCH v3 2/4] khugepage: Replace try_to_release_page() with filemap_release

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Date:   Thu, 17 Nov 2022 23:30:53 -0800
From:   "Vishal Moola (Oracle)" <vishal.moola@...il.com>
To:     linux-mm@...ck.org
Cc:     linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-ext4@...r.kernel.org, akpm@...ux-foundation.org,
        willy@...radead.org, naoya.horiguchi@....com, tytso@....edu,
        "Vishal Moola (Oracle)" <vishal.moola@...il.com>
Subject: [PATCH v3 2/4] khugepage: Replace try_to_release_page() with filemap_release_folio()

Replaces some calls with their folio equivalents. This change removes
4 calls to compound_head() and is in preparation for the removal of the
try_to_release_page() wrapper.

Signed-off-by: Vishal Moola (Oracle) <vishal.moola@...il.com>
---
 mm/khugepaged.c | 23 ++++++++++++-----------
 1 file changed, 12 insertions(+), 11 deletions(-)

diff --git a/mm/khugepaged.c b/mm/khugepaged.c
index 4734315f7940..3f21c010d2bd 100644
--- a/mm/khugepaged.c
+++ b/mm/khugepaged.c
@@ -1747,6 +1747,7 @@ static int collapse_file(struct mm_struct *mm, unsigned long addr,
 	xas_set(&xas, start);
 	for (index = start; index < end; index++) {
 		struct page *page = xas_next(&xas);
+		struct folio *folio;
 
 		VM_BUG_ON(index != xas.xa_index);
 		if (is_shmem) {
@@ -1773,8 +1774,6 @@ static int collapse_file(struct mm_struct *mm, unsigned long addr,
 			}
 
 			if (xa_is_value(page) || !PageUptodate(page)) {
-				struct folio *folio;
-
 				xas_unlock_irq(&xas);
 				/* swap in or instantiate fallocated page */
 				if (shmem_get_folio(mapping->host, index,
@@ -1862,13 +1861,15 @@ static int collapse_file(struct mm_struct *mm, unsigned long addr,
 			goto out_unlock;
 		}
 
-		if (page_mapping(page) != mapping) {
+		folio = page_folio(page);
+
+		if (folio_mapping(folio) != mapping) {
 			result = SCAN_TRUNCATED;
 			goto out_unlock;
 		}
 
-		if (!is_shmem && (PageDirty(page) ||
-				  PageWriteback(page))) {
+		if (!is_shmem && (folio_test_dirty(folio) ||
+				  folio_test_writeback(folio))) {
 			/*
 			 * khugepaged only works on read-only fd, so this
 			 * page is dirty because it hasn't been flushed
@@ -1878,20 +1879,20 @@ static int collapse_file(struct mm_struct *mm, unsigned long addr,
 			goto out_unlock;
 		}
 
-		if (isolate_lru_page(page)) {
+		if (folio_isolate_lru(folio)) {
 			result = SCAN_DEL_PAGE_LRU;
 			goto out_unlock;
 		}
 
-		if (page_has_private(page) &&
-		    !try_to_release_page(page, GFP_KERNEL)) {
+		if (folio_has_private(folio) &&
+		    !filemap_release_folio(folio, GFP_KERNEL)) {
 			result = SCAN_PAGE_HAS_PRIVATE;
-			putback_lru_page(page);
+			folio_putback_lru(folio);
 			goto out_unlock;
 		}
 
-		if (page_mapped(page))
-			try_to_unmap(page_folio(page),
+		if (folio_mapped(folio))
+			try_to_unmap(folio,
 					TTU_IGNORE_MLOCK | TTU_BATCH_FLUSH);
 
 		xas_lock_irq(&xas);
-- 
2.38.1