[PATCH 3/7] sysv: Convert sysv_set_link() and sysv_dotdot() to take a folio

["Matthew Wilcox (Oracle)" <willy@xxxxxxxxxxxxx>]

This matches ext2 and removes a few hidden calls to compound_head().

Signed-off-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
---
 fs/sysv/dir.c   | 23 ++++++++++-------------
 fs/sysv/namei.c | 10 +++++-----
 fs/sysv/sysv.h  |  4 ++--
 3 files changed, 17 insertions(+), 20 deletions(-)

diff --git a/fs/sysv/dir.c b/fs/sysv/dir.c
index 5b2e3c7c2971..ebccf7bb5b69 100644
--- a/fs/sysv/dir.c
+++ b/fs/sysv/dir.c
@@ -327,21 +327,21 @@ int sysv_empty_dir(struct inode * inode)
 }
 
 /* Releases the page */
-int sysv_set_link(struct sysv_dir_entry *de, struct page *page,
-	struct inode *inode)
+int sysv_set_link(struct sysv_dir_entry *de, struct folio *folio,
+		struct inode *inode)
 {
-	struct inode *dir = page->mapping->host;
-	loff_t pos = page_offset(page) + offset_in_page(de);
+	struct inode *dir = folio->mapping->host;
+	loff_t pos = folio_pos(folio) + offset_in_folio(folio, de);
 	int err;
 
-	lock_page(page);
-	err = sysv_prepare_chunk(page, pos, SYSV_DIRSIZE);
+	folio_lock(folio);
+	err = sysv_prepare_chunk(&folio->page, pos, SYSV_DIRSIZE);
 	if (err) {
-		unlock_page(page);
+		folio_unlock(folio);
 		return err;
 	}
 	de->inode = cpu_to_fs16(SYSV_SB(inode->i_sb), inode->i_ino);
-	dir_commit_chunk(page, pos, SYSV_DIRSIZE);
+	dir_commit_chunk(&folio->page, pos, SYSV_DIRSIZE);
 	inode_set_mtime_to_ts(dir, inode_set_ctime_current(dir));
 	mark_inode_dirty(dir);
 	return sysv_handle_dirsync(inode);
@@ -354,15 +354,12 @@ int sysv_set_link(struct sysv_dir_entry *de, struct page *page,
  * sysv_dotdot() acts as a call to dir_get_folio() and must be treated
  * accordingly for nesting purposes.
  */
-struct sysv_dir_entry *sysv_dotdot(struct inode *dir, struct page **p)
+struct sysv_dir_entry *sysv_dotdot(struct inode *dir, struct folio **foliop)
 {
-	struct folio *folio;
-
-	struct sysv_dir_entry *de = dir_get_folio(dir, 0, &folio);
+	struct sysv_dir_entry *de = dir_get_folio(dir, 0, foliop);
 
 	if (IS_ERR(de))
 		return NULL;
-	*p = &folio->page;
 	/* ".." is the second directory entry */
 	return de + 1;
 }
diff --git a/fs/sysv/namei.c b/fs/sysv/namei.c
index 970043fe49ee..ef4d91431225 100644
--- a/fs/sysv/namei.c
+++ b/fs/sysv/namei.c
@@ -194,7 +194,7 @@ static int sysv_rename(struct mnt_idmap *idmap, struct inode *old_dir,
 {
 	struct inode * old_inode = d_inode(old_dentry);
 	struct inode * new_inode = d_inode(new_dentry);
-	struct page * dir_page = NULL;
+	struct folio *dir_folio;
 	struct sysv_dir_entry * dir_de = NULL;
 	struct folio *old_folio;
 	struct sysv_dir_entry * old_de;
@@ -209,7 +209,7 @@ static int sysv_rename(struct mnt_idmap *idmap, struct inode *old_dir,
 
 	if (S_ISDIR(old_inode->i_mode)) {
 		err = -EIO;
-		dir_de = sysv_dotdot(old_inode, &dir_page);
+		dir_de = sysv_dotdot(old_inode, &dir_folio);
 		if (!dir_de)
 			goto out_old;
 	}
@@ -226,7 +226,7 @@ static int sysv_rename(struct mnt_idmap *idmap, struct inode *old_dir,
 		new_de = sysv_find_entry(new_dentry, &new_folio);
 		if (!new_de)
 			goto out_dir;
-		err = sysv_set_link(new_de, &new_folio->page, old_inode);
+		err = sysv_set_link(new_de, new_folio, old_inode);
 		folio_release_kmap(new_folio, new_de);
 		if (err)
 			goto out_dir;
@@ -249,14 +249,14 @@ static int sysv_rename(struct mnt_idmap *idmap, struct inode *old_dir,
 	mark_inode_dirty(old_inode);
 
 	if (dir_de) {
-		err = sysv_set_link(dir_de, dir_page, new_dir);
+		err = sysv_set_link(dir_de, dir_folio, new_dir);
 		if (!err)
 			inode_dec_link_count(old_dir);
 	}
 
 out_dir:
 	if (dir_de)
-		unmap_and_put_page(dir_page, dir_de);
+		folio_release_kmap(dir_folio, dir_de);
 out_old:
 	folio_release_kmap(old_folio, old_de);
 out:
diff --git a/fs/sysv/sysv.h b/fs/sysv/sysv.h
index be15c659a027..ee90af7dbed9 100644
--- a/fs/sysv/sysv.h
+++ b/fs/sysv/sysv.h
@@ -153,9 +153,9 @@ int sysv_add_link(struct dentry *, struct inode *);
 int sysv_delete_entry(struct sysv_dir_entry *, struct page *);
 int sysv_make_empty(struct inode *, struct inode *);
 int sysv_empty_dir(struct inode *);
-int sysv_set_link(struct sysv_dir_entry *, struct page *,
+int sysv_set_link(struct sysv_dir_entry *, struct folio *,
 			struct inode *);
-struct sysv_dir_entry *sysv_dotdot(struct inode *, struct page **);
+struct sysv_dir_entry *sysv_dotdot(struct inode *, struct folio **);
 ino_t sysv_inode_by_name(struct dentry *);
 
 
-- 
2.43.0