[PATCH 2/2] f2fs: remove folio_detach_private() in .invalidate_folio and .release_folio

[Jaegeuk Kim]

From: Chao Yu <chao@xxxxxxxxxx>

We have maintain PagePrivate and page_private and page reference
w/ {set,clear}_page_private_*, it doesn't need to call
folio_detach_private() in the end of .invalidate_folio and
.release_folio, remove it and use f2fs_bug_on instead.

This patch should be applied along with
("f2fs: remove set|get_private_inline to clean up").

Signed-off-by: Chao Yu <chao@xxxxxxxxxx>
Signed-off-by: Jaegeuk Kim <jaegeuk@xxxxxxxxxx>
---
 fs/f2fs/data.c |  4 ++--
 fs/f2fs/dir.c  |  5 ++---
 fs/f2fs/f2fs.h | 32 ++++++++------------------------
 3 files changed, 12 insertions(+), 29 deletions(-)

diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index 14cd647d727d..037e70e85f63 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -3732,7 +3732,7 @@ void f2fs_invalidate_folio(struct folio *folio, size_t offset, size_t length)
 			inode->i_ino == F2FS_COMPRESS_INO(sbi))
 		clear_page_private_data(&folio->page);
 
-	folio_detach_private(folio);
+	f2fs_bug_on(sbi, page_private(&folio->page));
 }
 
 bool f2fs_release_folio(struct folio *folio, gfp_t wait)
@@ -3754,7 +3754,7 @@ bool f2fs_release_folio(struct folio *folio, gfp_t wait)
 	clear_page_private_reference(&folio->page);
 	clear_page_private_gcing(&folio->page);
 
-	folio_detach_private(folio);
+	f2fs_bug_on(sbi, page_private(&folio->page));
 	return true;
 }
 
diff --git a/fs/f2fs/dir.c b/fs/f2fs/dir.c
index d6dd8327e82d..cea179dec3b6 100644
--- a/fs/f2fs/dir.c
+++ b/fs/f2fs/dir.c
@@ -906,13 +906,12 @@ void f2fs_delete_entry(struct f2fs_dir_entry *dentry, struct page *page,
 		clear_page_dirty_for_io(page);
 		ClearPageUptodate(page);
 
+		clear_page_private_reference(page);
 		clear_page_private_gcing(page);
+		f2fs_bug_on(F2FS_I_SB(dir), page_private(page));
 
 		inode_dec_dirty_pages(dir);
 		f2fs_remove_dirty_inode(dir);
-
-		detach_page_private(page);
-		set_page_private(page, 0);
 	}
 	f2fs_put_page(page, 1);
 
diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index 200fb2243e8a..48fbd8b54e69 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -1407,11 +1407,8 @@ static inline bool page_private_##name(struct page *page) \
 #define PAGE_PRIVATE_SET_FUNC(name, flagname) \
 static inline void set_page_private_##name(struct page *page) \
 { \
-	if (!PagePrivate(page)) { \
-		get_page(page); \
-		SetPagePrivate(page); \
-		set_page_private(page, 0); \
-	} \
+	if (!PagePrivate(page)) \
+		attach_page_private(page, (void *)0); \
 	set_bit(PAGE_PRIVATE_NOT_POINTER, &page_private(page)); \
 	set_bit(PAGE_PRIVATE_##flagname, &page_private(page)); \
 }
@@ -1420,13 +1417,8 @@ static inline void set_page_private_##name(struct page *page) \
 static inline void clear_page_private_##name(struct page *page) \
 { \
 	clear_bit(PAGE_PRIVATE_##flagname, &page_private(page)); \
-	if (page_private(page) == BIT(PAGE_PRIVATE_NOT_POINTER)) { \
-		set_page_private(page, 0); \
-		if (PagePrivate(page)) { \
-			ClearPagePrivate(page); \
-			put_page(page); \
-		}\
-	} \
+	if (page_private(page) == BIT(PAGE_PRIVATE_NOT_POINTER)) \
+		detach_page_private(page); \
 }
 
 PAGE_PRIVATE_GET_FUNC(nonpointer, NOT_POINTER);
@@ -1452,11 +1444,8 @@ static inline unsigned long get_page_private_data(struct page *page)
 
 static inline void set_page_private_data(struct page *page, unsigned long data)
 {
-	if (!PagePrivate(page)) {
-		get_page(page);
-		SetPagePrivate(page);
-		set_page_private(page, 0);
-	}
+	if (!PagePrivate(page))
+		attach_page_private(page, (void *)0);
 	set_bit(PAGE_PRIVATE_NOT_POINTER, &page_private(page));
 	page_private(page) |= data << PAGE_PRIVATE_MAX;
 }
@@ -1464,13 +1453,8 @@ static inline void set_page_private_data(struct page *page, unsigned long data)
 static inline void clear_page_private_data(struct page *page)
 {
 	page_private(page) &= GENMASK(PAGE_PRIVATE_MAX - 1, 0);
-	if (page_private(page) == BIT(PAGE_PRIVATE_NOT_POINTER)) {
-		set_page_private(page, 0);
-		if (PagePrivate(page)) {
-			ClearPagePrivate(page);
-			put_page(page);
-		}
-	}
+	if (page_private(page) == BIT(PAGE_PRIVATE_NOT_POINTER))
+		detach_page_private(page);
 }
 
 /* For compression */
-- 
2.40.0.577.gac1e443424-goog