[PATCH 00/10] Convert UFS directory handling to folios

[PATCH 00/10] Convert UFS directory handling to folios

[Matthew Wilcox (Oracle)]

This patch series mirrors the changes to ext2 directory handling.
It combines three distinct series of ext2 patches -- using kmap_local,
Al's refactoring of the xxx_get_page() interfaces and the folio patches,
and it does them in an order which is slightly more logical when you
know that you're going to be doing all three of those conversions.

Compile tested only.  I can't find a mkfs.ufs / mkfs.ffs.  I found a
Debian package called makefs, but couldn't figure out how to drive it
the way that fstests wants to.

Matthew Wilcox (Oracle) (10):
  ufs: Convert ufs_get_page() to use a folio
  ufs: Convert ufs_get_page() to ufs_get_folio()
  ufs: Convert ufs_check_page() to ufs_check_folio()
  ufs: Convert ufs_find_entry() to take a folio
  ufs: Convert ufs_set_link() and ufss_dotdot() to take a folio
  ufs: Convert ufs_delete_entry() to work on a folio
  ufs: Convert ufs_make_empty() to use a folio
  ufs: Convert ufs_prepare_chunk() to take a folio
  ufs; Convert ufs_commit_chunk() to take a folio
  ufs: Convert directory handling to kmap_local

 fs/ufs/dir.c   | 231 +++++++++++++++++++++++--------------------------
 fs/ufs/inode.c |   4 +-
 fs/ufs/namei.c |  39 ++++-----
 fs/ufs/ufs.h   |  20 +++--
 fs/ufs/util.h  |   6 +-
 5 files changed, 139 insertions(+), 161 deletions(-)

-- 
2.43.0

[PATCH 01/10] ufs: Convert ufs_get_page() to use a folio

[Matthew Wilcox (Oracle)]

Remove a call to read_mapping_page().

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
---
 fs/ufs/dir.c | 19 ++++++++++---------
 1 file changed, 10 insertions(+), 9 deletions(-)

diff --git a/fs/ufs/dir.c b/fs/ufs/dir.c
index 61f25d3cf3f7..0705848899c1 100644
--- a/fs/ufs/dir.c
+++ b/fs/ufs/dir.c
@@ -194,18 +194,19 @@ static bool ufs_check_page(struct page *page)
 static struct page *ufs_get_page(struct inode *dir, unsigned long n)
 {
 	struct address_space *mapping = dir->i_mapping;
-	struct page *page = read_mapping_page(mapping, n, NULL);
-	if (!IS_ERR(page)) {
-		kmap(page);
-		if (unlikely(!PageChecked(page))) {
-			if (!ufs_check_page(page))
-				goto fail;
-		}
+	struct folio *folio = read_mapping_folio(mapping, n, NULL);
+
+	if (IS_ERR(folio))
+		return &folio->page;
+	kmap(&folio->page);
+	if (unlikely(!folio_test_checked(folio))) {
+		if (!ufs_check_page(&folio->page))
+			goto fail;
 	}
-	return page;
+	return &folio->page;
 
 fail:
-	ufs_put_page(page);
+	ufs_put_page(&folio->page);
 	return ERR_PTR(-EIO);
 }
 
-- 
2.43.0

[PATCH 02/10] ufs: Convert ufs_get_page() to ufs_get_folio()

[Matthew Wilcox (Oracle)]

Use the same calling convention as ext2 (see commit 46022375abe8)
so that we can transition to kmap_local in a future patch.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
---
 fs/ufs/dir.c | 101 ++++++++++++++++++++++++---------------------------
 1 file changed, 48 insertions(+), 53 deletions(-)

diff --git a/fs/ufs/dir.c b/fs/ufs/dir.c
index 0705848899c1..6c3235f426ed 100644
--- a/fs/ufs/dir.c
+++ b/fs/ufs/dir.c
@@ -191,19 +191,22 @@ static bool ufs_check_page(struct page *page)
 	return false;
 }
 
-static struct page *ufs_get_page(struct inode *dir, unsigned long n)
+static void *ufs_get_folio(struct inode *dir, unsigned long n,
+		struct folio **foliop)
 {
 	struct address_space *mapping = dir->i_mapping;
 	struct folio *folio = read_mapping_folio(mapping, n, NULL);
+	void *kaddr;
 
 	if (IS_ERR(folio))
-		return &folio->page;
-	kmap(&folio->page);
+		return ERR_CAST(folio);
+	kaddr = kmap(&folio->page);
 	if (unlikely(!folio_test_checked(folio))) {
 		if (!ufs_check_page(&folio->page))
 			goto fail;
 	}
-	return &folio->page;
+	*foliop = folio;
+	return kaddr;
 
 fail:
 	ufs_put_page(&folio->page);
@@ -234,14 +237,14 @@ ufs_next_entry(struct super_block *sb, struct ufs_dir_entry *p)
 
 struct ufs_dir_entry *ufs_dotdot(struct inode *dir, struct page **p)
 {
-	struct page *page = ufs_get_page(dir, 0);
-	struct ufs_dir_entry *de = NULL;
+	struct folio *folio;
+	struct ufs_dir_entry *de = ufs_get_folio(dir, 0, &folio);
+
+	if (IS_ERR(de))
+		return NULL;
+	de = ufs_next_entry(dir->i_sb, de);
+	*p = &folio->page;
 
-	if (!IS_ERR(page)) {
-		de = ufs_next_entry(dir->i_sb,
-				    (struct ufs_dir_entry *)page_address(page));
-		*p = page;
-	}
 	return de;
 }
 
@@ -262,7 +265,7 @@ struct ufs_dir_entry *ufs_find_entry(struct inode *dir, const struct qstr *qstr,
 	unsigned reclen = UFS_DIR_REC_LEN(namelen);
 	unsigned long start, n;
 	unsigned long npages = dir_pages(dir);
-	struct page *page = NULL;
+	struct folio *folio;
 	struct ufs_inode_info *ui = UFS_I(dir);
 	struct ufs_dir_entry *de;
 
@@ -280,18 +283,17 @@ struct ufs_dir_entry *ufs_find_entry(struct inode *dir, const struct qstr *qstr,
 		start = 0;
 	n = start;
 	do {
-		char *kaddr;
-		page = ufs_get_page(dir, n);
-		if (!IS_ERR(page)) {
-			kaddr = page_address(page);
-			de = (struct ufs_dir_entry *) kaddr;
+		char *kaddr = ufs_get_folio(dir, n, &folio);
+
+		if (!IS_ERR(kaddr)) {
+			de = (struct ufs_dir_entry *)kaddr;
 			kaddr += ufs_last_byte(dir, n) - reclen;
 			while ((char *) de <= kaddr) {
 				if (ufs_match(sb, namelen, name, de))
 					goto found;
 				de = ufs_next_entry(sb, de);
 			}
-			ufs_put_page(page);
+			ufs_put_page(&folio->page);
 		}
 		if (++n >= npages)
 			n = 0;
@@ -300,7 +302,7 @@ struct ufs_dir_entry *ufs_find_entry(struct inode *dir, const struct qstr *qstr,
 	return NULL;
 
 found:
-	*res_page = page;
+	*res_page = &folio->page;
 	ui->i_dir_start_lookup = n;
 	return de;
 }
@@ -317,11 +319,10 @@ int ufs_add_link(struct dentry *dentry, struct inode *inode)
 	unsigned reclen = UFS_DIR_REC_LEN(namelen);
 	const unsigned int chunk_size = UFS_SB(sb)->s_uspi->s_dirblksize;
 	unsigned short rec_len, name_len;
-	struct page *page = NULL;
+	struct folio *folio = NULL;
 	struct ufs_dir_entry *de;
 	unsigned long npages = dir_pages(dir);
 	unsigned long n;
-	char *kaddr;
 	loff_t pos;
 	int err;
 
@@ -329,21 +330,19 @@ int ufs_add_link(struct dentry *dentry, struct inode *inode)
 
 	/*
 	 * We take care of directory expansion in the same loop.
-	 * This code plays outside i_size, so it locks the page
+	 * This code plays outside i_size, so it locks the folio
 	 * to protect that region.
 	 */
 	for (n = 0; n <= npages; n++) {
+		char *kaddr = ufs_get_folio(dir, n, &folio);
 		char *dir_end;
 
-		page = ufs_get_page(dir, n);
-		err = PTR_ERR(page);
-		if (IS_ERR(page))
-			goto out;
-		lock_page(page);
-		kaddr = page_address(page);
+		if (IS_ERR(kaddr))
+			return PTR_ERR(kaddr);
+		folio_lock(folio);
 		dir_end = kaddr + ufs_last_byte(dir, n);
 		de = (struct ufs_dir_entry *)kaddr;
-		kaddr += PAGE_SIZE - reclen;
+		kaddr += folio_size(folio) - reclen;
 		while ((char *)de <= kaddr) {
 			if ((char *)de == dir_end) {
 				/* We hit i_size */
@@ -370,16 +369,15 @@ int ufs_add_link(struct dentry *dentry, struct inode *inode)
 				goto got_it;
 			de = (struct ufs_dir_entry *) ((char *) de + rec_len);
 		}
-		unlock_page(page);
-		ufs_put_page(page);
+		folio_unlock(folio);
+		ufs_put_page(&folio->page);
 	}
 	BUG();
 	return -EINVAL;
 
 got_it:
-	pos = page_offset(page) +
-			(char*)de - (char*)page_address(page);
-	err = ufs_prepare_chunk(page, pos, rec_len);
+	pos = folio_pos(folio) + offset_in_folio(folio, de);
+	err = ufs_prepare_chunk(&folio->page, pos, rec_len);
 	if (err)
 		goto out_unlock;
 	if (de->d_ino) {
@@ -396,18 +394,17 @@ int ufs_add_link(struct dentry *dentry, struct inode *inode)
 	de->d_ino = cpu_to_fs32(sb, inode->i_ino);
 	ufs_set_de_type(sb, de, inode->i_mode);
 
-	ufs_commit_chunk(page, pos, rec_len);
+	ufs_commit_chunk(&folio->page, pos, rec_len);
 	inode_set_mtime_to_ts(dir, inode_set_ctime_current(dir));
 
 	mark_inode_dirty(dir);
 	err = ufs_handle_dirsync(dir);
 	/* OFFSET_CACHE */
 out_put:
-	ufs_put_page(page);
-out:
+	ufs_put_page(&folio->page);
 	return err;
 out_unlock:
-	unlock_page(page);
+	folio_unlock(folio);
 	goto out_put;
 }
 
@@ -445,19 +442,18 @@ ufs_readdir(struct file *file, struct dir_context *ctx)
 		return 0;
 
 	for ( ; n < npages; n++, offset = 0) {
-		char *kaddr, *limit;
 		struct ufs_dir_entry *de;
+		struct folio *folio;
+		char *kaddr = ufs_get_folio(inode, n, &folio);
+		char *limit;
 
-		struct page *page = ufs_get_page(inode, n);
-
-		if (IS_ERR(page)) {
+		if (IS_ERR(kaddr)) {
 			ufs_error(sb, __func__,
 				  "bad page in #%lu",
 				  inode->i_ino);
 			ctx->pos += PAGE_SIZE - offset;
-			return -EIO;
+			return PTR_ERR(kaddr);
 		}
-		kaddr = page_address(page);
 		if (unlikely(need_revalidate)) {
 			if (offset) {
 				offset = ufs_validate_entry(sb, kaddr, offset, chunk_mask);
@@ -483,13 +479,13 @@ ufs_readdir(struct file *file, struct dir_context *ctx)
 					       ufs_get_de_namlen(sb, de),
 					       fs32_to_cpu(sb, de->d_ino),
 					       d_type)) {
-					ufs_put_page(page);
+					ufs_put_page(&folio->page);
 					return 0;
 				}
 			}
 			ctx->pos += fs16_to_cpu(sb, de->d_reclen);
 		}
-		ufs_put_page(page);
+		ufs_put_page(&folio->page);
 	}
 	return 0;
 }
@@ -600,18 +596,17 @@ int ufs_make_empty(struct inode * inode, struct inode *dir)
 int ufs_empty_dir(struct inode * inode)
 {
 	struct super_block *sb = inode->i_sb;
-	struct page *page = NULL;
+	struct folio *folio;
+	char *kaddr;
 	unsigned long i, npages = dir_pages(inode);
 
 	for (i = 0; i < npages; i++) {
-		char *kaddr;
 		struct ufs_dir_entry *de;
-		page = ufs_get_page(inode, i);
 
-		if (IS_ERR(page))
+		kaddr = ufs_get_folio(inode, i, &folio);
+		if (IS_ERR(kaddr))
 			continue;
 
-		kaddr = page_address(page);
 		de = (struct ufs_dir_entry *)kaddr;
 		kaddr += ufs_last_byte(inode, i) - UFS_DIR_REC_LEN(1);
 
@@ -638,12 +633,12 @@ int ufs_empty_dir(struct inode * inode)
 			}
 			de = ufs_next_entry(sb, de);
 		}
-		ufs_put_page(page);
+		ufs_put_page(&folio->page);
 	}
 	return 1;
 
 not_empty:
-	ufs_put_page(page);
+	ufs_put_page(&folio->page);
 	return 0;
 }
 
-- 
2.43.0

[PATCH 03/10] ufs: Convert ufs_check_page() to ufs_check_folio()

[Matthew Wilcox (Oracle)]

Includes large folio support in case we decide to support block size >
PAGE_SIZE (as with ext2, this support will be limited to machines
without HIGHMEM).
---
 fs/ufs/dir.c | 28 +++++++++++++---------------
 1 file changed, 13 insertions(+), 15 deletions(-)

diff --git a/fs/ufs/dir.c b/fs/ufs/dir.c
index 6c3235f426ed..287cab597cc1 100644
--- a/fs/ufs/dir.c
+++ b/fs/ufs/dir.c
@@ -112,20 +112,18 @@ void ufs_set_link(struct inode *dir, struct ufs_dir_entry *de,
 	ufs_handle_dirsync(dir);
 }
 
-
-static bool ufs_check_page(struct page *page)
+static bool ufs_check_folio(struct folio *folio, char *kaddr)
 {
-	struct inode *dir = page->mapping->host;
+	struct inode *dir = folio->mapping->host;
 	struct super_block *sb = dir->i_sb;
-	char *kaddr = page_address(page);
 	unsigned offs, rec_len;
-	unsigned limit = PAGE_SIZE;
+	unsigned limit = folio_size(folio);
 	const unsigned chunk_mask = UFS_SB(sb)->s_uspi->s_dirblksize - 1;
 	struct ufs_dir_entry *p;
 	char *error;
 
-	if ((dir->i_size >> PAGE_SHIFT) == page->index) {
-		limit = dir->i_size & ~PAGE_MASK;
+	if (dir->i_size < folio_pos(folio) + limit) {
+		limit = offset_in_folio(folio, dir->i_size);
 		if (limit & chunk_mask)
 			goto Ebadsize;
 		if (!limit)
@@ -150,13 +148,13 @@ static bool ufs_check_page(struct page *page)
 	if (offs != limit)
 		goto Eend;
 out:
-	SetPageChecked(page);
+	folio_set_checked(folio);
 	return true;
 
 	/* Too bad, we had an error */
 
 Ebadsize:
-	ufs_error(sb, "ufs_check_page",
+	ufs_error(sb, __func__,
 		  "size of directory #%lu is not a multiple of chunk size",
 		  dir->i_ino
 	);
@@ -176,17 +174,17 @@ static bool ufs_check_page(struct page *page)
 Einumber:
 	error = "inode out of bounds";
 bad_entry:
-	ufs_error (sb, "ufs_check_page", "bad entry in directory #%lu: %s - "
-		   "offset=%lu, rec_len=%d, name_len=%d",
-		   dir->i_ino, error, (page->index<<PAGE_SHIFT)+offs,
+	ufs_error(sb, __func__, "bad entry in directory #%lu: %s - "
+		   "offset=%llu, rec_len=%d, name_len=%d",
+		   dir->i_ino, error, folio_pos(folio) + offs,
 		   rec_len, ufs_get_de_namlen(sb, p));
 	goto fail;
 Eend:
 	p = (struct ufs_dir_entry *)(kaddr + offs);
 	ufs_error(sb, __func__,
 		   "entry in directory #%lu spans the page boundary"
-		   "offset=%lu",
-		   dir->i_ino, (page->index<<PAGE_SHIFT)+offs);
+		   "offset=%llu",
+		   dir->i_ino, folio_pos(folio) + offs);
 fail:
 	return false;
 }
@@ -202,7 +200,7 @@ static void *ufs_get_folio(struct inode *dir, unsigned long n,
 		return ERR_CAST(folio);
 	kaddr = kmap(&folio->page);
 	if (unlikely(!folio_test_checked(folio))) {
-		if (!ufs_check_page(&folio->page))
+		if (!ufs_check_folio(folio, kaddr))
 			goto fail;
 	}
 	*foliop = folio;
-- 
2.43.0

[PATCH 04/10] ufs: Convert ufs_find_entry() to take a folio

[Matthew Wilcox (Oracle)]

This matches ext2 and pushes the use of folios out by one layer.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
---
 fs/ufs/dir.c   | 17 ++++++-----------
 fs/ufs/namei.c | 22 +++++++++++-----------
 fs/ufs/ufs.h   | 20 +++++++++++---------
 3 files changed, 28 insertions(+), 31 deletions(-)

diff --git a/fs/ufs/dir.c b/fs/ufs/dir.c
index 287cab597cc1..fb56a00b622c 100644
--- a/fs/ufs/dir.c
+++ b/fs/ufs/dir.c
@@ -76,12 +76,12 @@ ino_t ufs_inode_by_name(struct inode *dir, const struct qstr *qstr)
 {
 	ino_t res = 0;
 	struct ufs_dir_entry *de;
-	struct page *page;
+	struct folio *folio;
 	
-	de = ufs_find_entry(dir, qstr, &page);
+	de = ufs_find_entry(dir, qstr, &folio);
 	if (de) {
 		res = fs32_to_cpu(dir->i_sb, de->d_ino);
-		ufs_put_page(page);
+		ufs_put_page(&folio->page);
 	}
 	return res;
 }
@@ -255,7 +255,7 @@ struct ufs_dir_entry *ufs_dotdot(struct inode *dir, struct page **p)
  * Entry is guaranteed to be valid.
  */
 struct ufs_dir_entry *ufs_find_entry(struct inode *dir, const struct qstr *qstr,
-				     struct page **res_page)
+				     struct folio **foliop)
 {
 	struct super_block *sb = dir->i_sb;
 	const unsigned char *name = qstr->name;
@@ -263,7 +263,6 @@ struct ufs_dir_entry *ufs_find_entry(struct inode *dir, const struct qstr *qstr,
 	unsigned reclen = UFS_DIR_REC_LEN(namelen);
 	unsigned long start, n;
 	unsigned long npages = dir_pages(dir);
-	struct folio *folio;
 	struct ufs_inode_info *ui = UFS_I(dir);
 	struct ufs_dir_entry *de;
 
@@ -272,16 +271,13 @@ struct ufs_dir_entry *ufs_find_entry(struct inode *dir, const struct qstr *qstr,
 	if (npages == 0 || namelen > UFS_MAXNAMLEN)
 		goto out;
 
-	/* OFFSET_CACHE */
-	*res_page = NULL;
-
 	start = ui->i_dir_start_lookup;
 
 	if (start >= npages)
 		start = 0;
 	n = start;
 	do {
-		char *kaddr = ufs_get_folio(dir, n, &folio);
+		char *kaddr = ufs_get_folio(dir, n, foliop);
 
 		if (!IS_ERR(kaddr)) {
 			de = (struct ufs_dir_entry *)kaddr;
@@ -291,7 +287,7 @@ struct ufs_dir_entry *ufs_find_entry(struct inode *dir, const struct qstr *qstr,
 					goto found;
 				de = ufs_next_entry(sb, de);
 			}
-			ufs_put_page(&folio->page);
+			ufs_put_page(&(*foliop)->page);
 		}
 		if (++n >= npages)
 			n = 0;
@@ -300,7 +296,6 @@ struct ufs_dir_entry *ufs_find_entry(struct inode *dir, const struct qstr *qstr,
 	return NULL;
 
 found:
-	*res_page = &folio->page;
 	ui->i_dir_start_lookup = n;
 	return de;
 }
diff --git a/fs/ufs/namei.c b/fs/ufs/namei.c
index 9cad29463791..53e9bfad54df 100644
--- a/fs/ufs/namei.c
+++ b/fs/ufs/namei.c
@@ -209,14 +209,14 @@ static int ufs_unlink(struct inode *dir, struct dentry *dentry)
 {
 	struct inode * inode = d_inode(dentry);
 	struct ufs_dir_entry *de;
-	struct page *page;
+	struct folio *folio;
 	int err = -ENOENT;
 
-	de = ufs_find_entry(dir, &dentry->d_name, &page);
+	de = ufs_find_entry(dir, &dentry->d_name, &folio);
 	if (!de)
 		goto out;
 
-	err = ufs_delete_entry(dir, de, page);
+	err = ufs_delete_entry(dir, de, &folio->page);
 	if (err)
 		goto out;
 
@@ -251,14 +251,14 @@ static int ufs_rename(struct mnt_idmap *idmap, struct inode *old_dir,
 	struct inode *new_inode = d_inode(new_dentry);
 	struct page *dir_page = NULL;
 	struct ufs_dir_entry * dir_de = NULL;
-	struct page *old_page;
+	struct folio *old_folio;
 	struct ufs_dir_entry *old_de;
 	int err = -ENOENT;
 
 	if (flags & ~RENAME_NOREPLACE)
 		return -EINVAL;
 
-	old_de = ufs_find_entry(old_dir, &old_dentry->d_name, &old_page);
+	old_de = ufs_find_entry(old_dir, &old_dentry->d_name, &old_folio);
 	if (!old_de)
 		goto out;
 
@@ -270,7 +270,7 @@ static int ufs_rename(struct mnt_idmap *idmap, struct inode *old_dir,
 	}
 
 	if (new_inode) {
-		struct page *new_page;
+		struct folio *new_folio;
 		struct ufs_dir_entry *new_de;
 
 		err = -ENOTEMPTY;
@@ -278,10 +278,10 @@ static int ufs_rename(struct mnt_idmap *idmap, struct inode *old_dir,
 			goto out_dir;
 
 		err = -ENOENT;
-		new_de = ufs_find_entry(new_dir, &new_dentry->d_name, &new_page);
+		new_de = ufs_find_entry(new_dir, &new_dentry->d_name, &new_folio);
 		if (!new_de)
 			goto out_dir;
-		ufs_set_link(new_dir, new_de, new_page, old_inode, 1);
+		ufs_set_link(new_dir, new_de, &new_folio->page, old_inode, 1);
 		inode_set_ctime_current(new_inode);
 		if (dir_de)
 			drop_nlink(new_inode);
@@ -300,7 +300,7 @@ static int ufs_rename(struct mnt_idmap *idmap, struct inode *old_dir,
 	 */
 	inode_set_ctime_current(old_inode);
 
-	ufs_delete_entry(old_dir, old_de, old_page);
+	ufs_delete_entry(old_dir, old_de, &old_folio->page);
 	mark_inode_dirty(old_inode);
 
 	if (dir_de) {
@@ -321,8 +321,8 @@ static int ufs_rename(struct mnt_idmap *idmap, struct inode *old_dir,
 		put_page(dir_page);
 	}
 out_old:
-	kunmap(old_page);
-	put_page(old_page);
+	kunmap(&old_folio->page);
+	folio_put(old_folio);
 out:
 	return err;
 }
diff --git a/fs/ufs/ufs.h b/fs/ufs/ufs.h
index 6b499180643b..161fe0bb6fd1 100644
--- a/fs/ufs/ufs.h
+++ b/fs/ufs/ufs.h
@@ -99,15 +99,17 @@ extern void ufs_put_cylinder (struct super_block *, unsigned);
 
 /* dir.c */
 extern const struct inode_operations ufs_dir_inode_operations;
-extern int ufs_add_link (struct dentry *, struct inode *);
-extern ino_t ufs_inode_by_name(struct inode *, const struct qstr *);
-extern int ufs_make_empty(struct inode *, struct inode *);
-extern struct ufs_dir_entry *ufs_find_entry(struct inode *, const struct qstr *, struct page **);
-extern int ufs_delete_entry(struct inode *, struct ufs_dir_entry *, struct page *);
-extern int ufs_empty_dir (struct inode *);
-extern struct ufs_dir_entry *ufs_dotdot(struct inode *, struct page **);
-extern void ufs_set_link(struct inode *dir, struct ufs_dir_entry *de,
-			 struct page *page, struct inode *inode, bool update_times);
+
+int ufs_add_link(struct dentry *, struct inode *);
+ino_t ufs_inode_by_name(struct inode *, const struct qstr *);
+int ufs_make_empty(struct inode *, struct inode *);
+struct ufs_dir_entry *ufs_find_entry(struct inode *, const struct qstr *,
+		struct folio **);
+int ufs_delete_entry(struct inode *, struct ufs_dir_entry *, struct page *);
+int ufs_empty_dir(struct inode *);
+struct ufs_dir_entry *ufs_dotdot(struct inode *, struct page **);
+void ufs_set_link(struct inode *dir, struct ufs_dir_entry *de,
+		struct page *page, struct inode *inode, bool update_times);
 
 /* file.c */
 extern const struct inode_operations ufs_file_inode_operations;
-- 
2.43.0

[PATCH 05/10] ufs: Convert ufs_set_link() and ufss_dotdot() to take a folio

[Matthew Wilcox (Oracle)]

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

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
---
 fs/ufs/dir.c   | 26 +++++++++++---------------
 fs/ufs/namei.c | 16 ++++++++--------
 fs/ufs/ufs.h   |  4 ++--
 3 files changed, 21 insertions(+), 25 deletions(-)

diff --git a/fs/ufs/dir.c b/fs/ufs/dir.c
index fb56a00b622c..6fcca4dd064a 100644
--- a/fs/ufs/dir.c
+++ b/fs/ufs/dir.c
@@ -89,23 +89,22 @@ ino_t ufs_inode_by_name(struct inode *dir, const struct qstr *qstr)
 
 /* Releases the page */
 void ufs_set_link(struct inode *dir, struct ufs_dir_entry *de,
-		  struct page *page, struct inode *inode,
+		  struct folio *folio, struct inode *inode,
 		  bool update_times)
 {
-	loff_t pos = page_offset(page) +
-			(char *) de - (char *) page_address(page);
+	loff_t pos = folio_pos(folio) + offset_in_folio(folio, de);
 	unsigned len = fs16_to_cpu(dir->i_sb, de->d_reclen);
 	int err;
 
-	lock_page(page);
-	err = ufs_prepare_chunk(page, pos, len);
+	folio_lock(folio);
+	err = ufs_prepare_chunk(&folio->page, pos, len);
 	BUG_ON(err);
 
 	de->d_ino = cpu_to_fs32(dir->i_sb, inode->i_ino);
 	ufs_set_de_type(dir->i_sb, de, inode->i_mode);
 
-	ufs_commit_chunk(page, pos, len);
-	ufs_put_page(page);
+	ufs_commit_chunk(&folio->page, pos, len);
+	ufs_put_page(&folio->page);
 	if (update_times)
 		inode_set_mtime_to_ts(dir, inode_set_ctime_current(dir));
 	mark_inode_dirty(dir);
@@ -233,17 +232,14 @@ ufs_next_entry(struct super_block *sb, struct ufs_dir_entry *p)
 					fs16_to_cpu(sb, p->d_reclen));
 }
 
-struct ufs_dir_entry *ufs_dotdot(struct inode *dir, struct page **p)
+struct ufs_dir_entry *ufs_dotdot(struct inode *dir, struct folio **foliop)
 {
-	struct folio *folio;
-	struct ufs_dir_entry *de = ufs_get_folio(dir, 0, &folio);
+	struct ufs_dir_entry *de = ufs_get_folio(dir, 0, foliop);
 
-	if (IS_ERR(de))
-		return NULL;
-	de = ufs_next_entry(dir->i_sb, de);
-	*p = &folio->page;
+	if (!IS_ERR(de))
+		return ufs_next_entry(dir->i_sb, de);
 
-	return de;
+	return NULL;
 }
 
 /*
diff --git a/fs/ufs/namei.c b/fs/ufs/namei.c
index 53e9bfad54df..1759b710d831 100644
--- a/fs/ufs/namei.c
+++ b/fs/ufs/namei.c
@@ -249,7 +249,7 @@ static int ufs_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 = NULL;
 	struct ufs_dir_entry * dir_de = NULL;
 	struct folio *old_folio;
 	struct ufs_dir_entry *old_de;
@@ -264,7 +264,7 @@ static int ufs_rename(struct mnt_idmap *idmap, struct inode *old_dir,
 
 	if (S_ISDIR(old_inode->i_mode)) {
 		err = -EIO;
-		dir_de = ufs_dotdot(old_inode, &dir_page);
+		dir_de = ufs_dotdot(old_inode, &dir_folio);
 		if (!dir_de)
 			goto out_old;
 	}
@@ -281,7 +281,7 @@ static int ufs_rename(struct mnt_idmap *idmap, struct inode *old_dir,
 		new_de = ufs_find_entry(new_dir, &new_dentry->d_name, &new_folio);
 		if (!new_de)
 			goto out_dir;
-		ufs_set_link(new_dir, new_de, &new_folio->page, old_inode, 1);
+		ufs_set_link(new_dir, new_de, new_folio, old_inode, 1);
 		inode_set_ctime_current(new_inode);
 		if (dir_de)
 			drop_nlink(new_inode);
@@ -305,10 +305,10 @@ static int ufs_rename(struct mnt_idmap *idmap, struct inode *old_dir,
 
 	if (dir_de) {
 		if (old_dir != new_dir)
-			ufs_set_link(old_inode, dir_de, dir_page, new_dir, 0);
+			ufs_set_link(old_inode, dir_de, dir_folio, new_dir, 0);
 		else {
-			kunmap(dir_page);
-			put_page(dir_page);
+			kunmap(&dir_folio->page);
+			folio_put(dir_folio);
 		}
 		inode_dec_link_count(old_dir);
 	}
@@ -317,8 +317,8 @@ static int ufs_rename(struct mnt_idmap *idmap, struct inode *old_dir,
 
 out_dir:
 	if (dir_de) {
-		kunmap(dir_page);
-		put_page(dir_page);
+		kunmap(&dir_folio->page);
+		folio_put(dir_folio);
 	}
 out_old:
 	kunmap(&old_folio->page);
diff --git a/fs/ufs/ufs.h b/fs/ufs/ufs.h
index 161fe0bb6fd1..1ad992ab2855 100644
--- a/fs/ufs/ufs.h
+++ b/fs/ufs/ufs.h
@@ -107,9 +107,9 @@ struct ufs_dir_entry *ufs_find_entry(struct inode *, const struct qstr *,
 		struct folio **);
 int ufs_delete_entry(struct inode *, struct ufs_dir_entry *, struct page *);
 int ufs_empty_dir(struct inode *);
-struct ufs_dir_entry *ufs_dotdot(struct inode *, struct page **);
+struct ufs_dir_entry *ufs_dotdot(struct inode *, struct folio **);
 void ufs_set_link(struct inode *dir, struct ufs_dir_entry *de,
-		struct page *page, struct inode *inode, bool update_times);
+		struct folio *folio, struct inode *inode, bool update_times);
 
 /* file.c */
 extern const struct inode_operations ufs_file_inode_operations;
-- 
2.43.0

[PATCH 06/10] ufs: Convert ufs_delete_entry() to work on a folio

[Matthew Wilcox (Oracle)]

Match ext2 and remove a few hidden calls to compound_head().

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
---
 fs/ufs/dir.c   | 29 ++++++++++++++++-------------
 fs/ufs/namei.c |  4 ++--
 fs/ufs/ufs.h   |  2 +-
 3 files changed, 19 insertions(+), 16 deletions(-)

diff --git a/fs/ufs/dir.c b/fs/ufs/dir.c
index 6fcca4dd064a..945fff87b385 100644
--- a/fs/ufs/dir.c
+++ b/fs/ufs/dir.c
@@ -485,19 +485,23 @@ ufs_readdir(struct file *file, struct dir_context *ctx)
  * previous entry.
  */
 int ufs_delete_entry(struct inode *inode, struct ufs_dir_entry *dir,
-		     struct page * page)
+		     struct folio *folio)
 {
 	struct super_block *sb = inode->i_sb;
-	char *kaddr = page_address(page);
-	unsigned from = ((char*)dir - kaddr) & ~(UFS_SB(sb)->s_uspi->s_dirblksize - 1);
-	unsigned to = ((char*)dir - kaddr) + fs16_to_cpu(sb, dir->d_reclen);
+	size_t from, to;
+	char *kaddr;
 	loff_t pos;
-	struct ufs_dir_entry *pde = NULL;
-	struct ufs_dir_entry *de = (struct ufs_dir_entry *) (kaddr + from);
+	struct ufs_dir_entry *de, *pde = NULL;
 	int err;
 
 	UFSD("ENTER\n");
 
+	from = offset_in_folio(folio, dir);
+	to = from + fs16_to_cpu(sb, dir->d_reclen);
+	kaddr = (char *)dir - from;
+	from &= ~(UFS_SB(sb)->s_uspi->s_dirblksize - 1);
+	de = (struct ufs_dir_entry *) (kaddr + from);
+
 	UFSD("ino %u, reclen %u, namlen %u, name %s\n",
 	      fs32_to_cpu(sb, de->d_ino),
 	      fs16_to_cpu(sb, de->d_reclen),
@@ -514,21 +518,20 @@ int ufs_delete_entry(struct inode *inode, struct ufs_dir_entry *dir,
 		de = ufs_next_entry(sb, de);
 	}
 	if (pde)
-		from = (char*)pde - (char*)page_address(page);
-
-	pos = page_offset(page) + from;
-	lock_page(page);
-	err = ufs_prepare_chunk(page, pos, to - from);
+		from = offset_in_folio(folio, pde);
+	pos = folio_pos(folio) + from;
+	folio_lock(folio);
+	err = ufs_prepare_chunk(&folio->page, pos, to - from);
 	BUG_ON(err);
 	if (pde)
 		pde->d_reclen = cpu_to_fs16(sb, to - from);
 	dir->d_ino = 0;
-	ufs_commit_chunk(page, pos, to - from);
+	ufs_commit_chunk(&folio->page, pos, to - from);
 	inode_set_mtime_to_ts(inode, inode_set_ctime_current(inode));
 	mark_inode_dirty(inode);
 	err = ufs_handle_dirsync(inode);
 out:
-	ufs_put_page(page);
+	ufs_put_page(&folio->page);
 	UFSD("EXIT\n");
 	return err;
 }
diff --git a/fs/ufs/namei.c b/fs/ufs/namei.c
index 1759b710d831..a9b0c15de067 100644
--- a/fs/ufs/namei.c
+++ b/fs/ufs/namei.c
@@ -216,7 +216,7 @@ static int ufs_unlink(struct inode *dir, struct dentry *dentry)
 	if (!de)
 		goto out;
 
-	err = ufs_delete_entry(dir, de, &folio->page);
+	err = ufs_delete_entry(dir, de, folio);
 	if (err)
 		goto out;
 
@@ -300,7 +300,7 @@ static int ufs_rename(struct mnt_idmap *idmap, struct inode *old_dir,
 	 */
 	inode_set_ctime_current(old_inode);
 
-	ufs_delete_entry(old_dir, old_de, &old_folio->page);
+	ufs_delete_entry(old_dir, old_de, old_folio);
 	mark_inode_dirty(old_inode);
 
 	if (dir_de) {
diff --git a/fs/ufs/ufs.h b/fs/ufs/ufs.h
index 1ad992ab2855..a2c762cb65a0 100644
--- a/fs/ufs/ufs.h
+++ b/fs/ufs/ufs.h
@@ -105,7 +105,7 @@ ino_t ufs_inode_by_name(struct inode *, const struct qstr *);
 int ufs_make_empty(struct inode *, struct inode *);
 struct ufs_dir_entry *ufs_find_entry(struct inode *, const struct qstr *,
 		struct folio **);
-int ufs_delete_entry(struct inode *, struct ufs_dir_entry *, struct page *);
+int ufs_delete_entry(struct inode *, struct ufs_dir_entry *, struct folio *);
 int ufs_empty_dir(struct inode *);
 struct ufs_dir_entry *ufs_dotdot(struct inode *, struct folio **);
 void ufs_set_link(struct inode *dir, struct ufs_dir_entry *de,
-- 
2.43.0

[PATCH 07/10] ufs: Convert ufs_make_empty() to use a folio

[Matthew Wilcox (Oracle)]

Removes a few hidden calls to compound_head() and uses kmap_local
instead of kmap.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
---
 fs/ufs/dir.c | 25 ++++++++++++-------------
 1 file changed, 12 insertions(+), 13 deletions(-)

diff --git a/fs/ufs/dir.c b/fs/ufs/dir.c
index 945fff87b385..6a2a6af38097 100644
--- a/fs/ufs/dir.c
+++ b/fs/ufs/dir.c
@@ -540,26 +540,25 @@ int ufs_make_empty(struct inode * inode, struct inode *dir)
 {
 	struct super_block * sb = dir->i_sb;
 	struct address_space *mapping = inode->i_mapping;
-	struct page *page = grab_cache_page(mapping, 0);
+	struct folio *folio = filemap_grab_folio(mapping, 0);
 	const unsigned int chunk_size = UFS_SB(sb)->s_uspi->s_dirblksize;
 	struct ufs_dir_entry * de;
-	char *base;
 	int err;
+	char *kaddr;
 
-	if (!page)
-		return -ENOMEM;
+	if (IS_ERR(folio))
+		return PTR_ERR(folio);
 
-	err = ufs_prepare_chunk(page, 0, chunk_size);
+	err = ufs_prepare_chunk(&folio->page, 0, chunk_size);
 	if (err) {
-		unlock_page(page);
+		folio_unlock(folio);
 		goto fail;
 	}
 
-	kmap(page);
-	base = (char*)page_address(page);
-	memset(base, 0, PAGE_SIZE);
+	kaddr = kmap_local_folio(folio, 0);
+	memset(kaddr, 0, folio_size(folio));
 
-	de = (struct ufs_dir_entry *) base;
+	de = (struct ufs_dir_entry *)kaddr;
 
 	de->d_ino = cpu_to_fs32(sb, inode->i_ino);
 	ufs_set_de_type(sb, de, inode->i_mode);
@@ -573,12 +572,12 @@ int ufs_make_empty(struct inode * inode, struct inode *dir)
 	de->d_reclen = cpu_to_fs16(sb, chunk_size - UFS_DIR_REC_LEN(1));
 	ufs_set_de_namlen(sb, de, 2);
 	strcpy (de->d_name, "..");
-	kunmap(page);
+	kunmap_local(kaddr);
 
-	ufs_commit_chunk(page, 0, chunk_size);
+	ufs_commit_chunk(&folio->page, 0, chunk_size);
 	err = ufs_handle_dirsync(inode);
 fail:
-	put_page(page);
+	folio_put(folio);
 	return err;
 }
 
-- 
2.43.0

[PATCH 08/10] ufs: Convert ufs_prepare_chunk() to take a folio

[Matthew Wilcox (Oracle)]

All callers now have a folio, so convert ufs_prepare_chunk() to take one.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
---
 fs/ufs/dir.c   | 8 ++++----
 fs/ufs/inode.c | 4 ++--
 fs/ufs/util.h  | 6 +++---
 3 files changed, 9 insertions(+), 9 deletions(-)

diff --git a/fs/ufs/dir.c b/fs/ufs/dir.c
index 6a2a6af38097..a20f66351c66 100644
--- a/fs/ufs/dir.c
+++ b/fs/ufs/dir.c
@@ -97,7 +97,7 @@ void ufs_set_link(struct inode *dir, struct ufs_dir_entry *de,
 	int err;
 
 	folio_lock(folio);
-	err = ufs_prepare_chunk(&folio->page, pos, len);
+	err = ufs_prepare_chunk(folio, pos, len);
 	BUG_ON(err);
 
 	de->d_ino = cpu_to_fs32(dir->i_sb, inode->i_ino);
@@ -366,7 +366,7 @@ int ufs_add_link(struct dentry *dentry, struct inode *inode)
 
 got_it:
 	pos = folio_pos(folio) + offset_in_folio(folio, de);
-	err = ufs_prepare_chunk(&folio->page, pos, rec_len);
+	err = ufs_prepare_chunk(folio, pos, rec_len);
 	if (err)
 		goto out_unlock;
 	if (de->d_ino) {
@@ -521,7 +521,7 @@ int ufs_delete_entry(struct inode *inode, struct ufs_dir_entry *dir,
 		from = offset_in_folio(folio, pde);
 	pos = folio_pos(folio) + from;
 	folio_lock(folio);
-	err = ufs_prepare_chunk(&folio->page, pos, to - from);
+	err = ufs_prepare_chunk(folio, pos, to - from);
 	BUG_ON(err);
 	if (pde)
 		pde->d_reclen = cpu_to_fs16(sb, to - from);
@@ -549,7 +549,7 @@ int ufs_make_empty(struct inode * inode, struct inode *dir)
 	if (IS_ERR(folio))
 		return PTR_ERR(folio);
 
-	err = ufs_prepare_chunk(&folio->page, 0, chunk_size);
+	err = ufs_prepare_chunk(folio, 0, chunk_size);
 	if (err) {
 		folio_unlock(folio);
 		goto fail;
diff --git a/fs/ufs/inode.c b/fs/ufs/inode.c
index a7bb2e63cdde..0e608fc0d0fd 100644
--- a/fs/ufs/inode.c
+++ b/fs/ufs/inode.c
@@ -479,9 +479,9 @@ static int ufs_read_folio(struct file *file, struct folio *folio)
 	return block_read_full_folio(folio, ufs_getfrag_block);
 }
 
-int ufs_prepare_chunk(struct page *page, loff_t pos, unsigned len)
+int ufs_prepare_chunk(struct folio *folio, loff_t pos, unsigned len)
 {
-	return __block_write_begin(page, pos, len, ufs_getfrag_block);
+	return __block_write_begin(&folio->page, pos, len, ufs_getfrag_block);
 }
 
 static void ufs_truncate_blocks(struct inode *);
diff --git a/fs/ufs/util.h b/fs/ufs/util.h
index 0ecd2ed792f5..bf708b68f150 100644
--- a/fs/ufs/util.h
+++ b/fs/ufs/util.h
@@ -250,9 +250,9 @@ ufs_set_inode_gid(struct super_block *sb, struct ufs_inode *inode, u32 value)
 	}
 }
 
-extern dev_t ufs_get_inode_dev(struct super_block *, struct ufs_inode_info *);
-extern void ufs_set_inode_dev(struct super_block *, struct ufs_inode_info *, dev_t);
-extern int ufs_prepare_chunk(struct page *page, loff_t pos, unsigned len);
+dev_t ufs_get_inode_dev(struct super_block *, struct ufs_inode_info *);
+void ufs_set_inode_dev(struct super_block *, struct ufs_inode_info *, dev_t);
+int ufs_prepare_chunk(struct folio *folio, loff_t pos, unsigned len);
 
 /*
  * These functions manipulate ufs buffers
-- 
2.43.0

[PATCH 09/10] ufs; Convert ufs_commit_chunk() to take a folio

[Matthew Wilcox (Oracle)]

All callers now have a folio, so pass it in.  Saves a call to
compound_head().

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
---
 fs/ufs/dir.c | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

diff --git a/fs/ufs/dir.c b/fs/ufs/dir.c
index a20f66351c66..71685491d5f6 100644
--- a/fs/ufs/dir.c
+++ b/fs/ufs/dir.c
@@ -42,18 +42,18 @@ static inline int ufs_match(struct super_block *sb, int len,
 	return !memcmp(name, de->d_name, len);
 }
 
-static void ufs_commit_chunk(struct page *page, loff_t pos, unsigned len)
+static void ufs_commit_chunk(struct folio *folio, loff_t pos, unsigned len)
 {
-	struct address_space *mapping = page->mapping;
+	struct address_space *mapping = folio->mapping;
 	struct inode *dir = mapping->host;
 
 	inode_inc_iversion(dir);
-	block_write_end(NULL, mapping, pos, len, len, page, NULL);
+	block_write_end(NULL, mapping, pos, len, len, &folio->page, NULL);
 	if (pos+len > dir->i_size) {
 		i_size_write(dir, pos+len);
 		mark_inode_dirty(dir);
 	}
-	unlock_page(page);
+	folio_unlock(folio);
 }
 
 static int ufs_handle_dirsync(struct inode *dir)
@@ -103,7 +103,7 @@ void ufs_set_link(struct inode *dir, struct ufs_dir_entry *de,
 	de->d_ino = cpu_to_fs32(dir->i_sb, inode->i_ino);
 	ufs_set_de_type(dir->i_sb, de, inode->i_mode);
 
-	ufs_commit_chunk(&folio->page, pos, len);
+	ufs_commit_chunk(folio, pos, len);
 	ufs_put_page(&folio->page);
 	if (update_times)
 		inode_set_mtime_to_ts(dir, inode_set_ctime_current(dir));
@@ -383,7 +383,7 @@ int ufs_add_link(struct dentry *dentry, struct inode *inode)
 	de->d_ino = cpu_to_fs32(sb, inode->i_ino);
 	ufs_set_de_type(sb, de, inode->i_mode);
 
-	ufs_commit_chunk(&folio->page, pos, rec_len);
+	ufs_commit_chunk(folio, pos, rec_len);
 	inode_set_mtime_to_ts(dir, inode_set_ctime_current(dir));
 
 	mark_inode_dirty(dir);
@@ -526,7 +526,7 @@ int ufs_delete_entry(struct inode *inode, struct ufs_dir_entry *dir,
 	if (pde)
 		pde->d_reclen = cpu_to_fs16(sb, to - from);
 	dir->d_ino = 0;
-	ufs_commit_chunk(&folio->page, pos, to - from);
+	ufs_commit_chunk(folio, pos, to - from);
 	inode_set_mtime_to_ts(inode, inode_set_ctime_current(inode));
 	mark_inode_dirty(inode);
 	err = ufs_handle_dirsync(inode);
@@ -574,7 +574,7 @@ int ufs_make_empty(struct inode * inode, struct inode *dir)
 	strcpy (de->d_name, "..");
 	kunmap_local(kaddr);
 
-	ufs_commit_chunk(&folio->page, 0, chunk_size);
+	ufs_commit_chunk(folio, 0, chunk_size);
 	err = ufs_handle_dirsync(inode);
 fail:
 	folio_put(folio);
-- 
2.43.0

[PATCH 10/10] ufs: Convert directory handling to kmap_local

[Matthew Wilcox (Oracle)]

Remove kmap use and use folio_release_kmap() instead of ufs_put_page().

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
---
 fs/ufs/dir.c   | 30 ++++++++++++------------------
 fs/ufs/namei.c | 15 +++++----------
 2 files changed, 17 insertions(+), 28 deletions(-)

diff --git a/fs/ufs/dir.c b/fs/ufs/dir.c
index 71685491d5f6..3b3cd84f1f7f 100644
--- a/fs/ufs/dir.c
+++ b/fs/ufs/dir.c
@@ -66,12 +66,6 @@ static int ufs_handle_dirsync(struct inode *dir)
 	return err;
 }
 
-static inline void ufs_put_page(struct page *page)
-{
-	kunmap(page);
-	put_page(page);
-}
-
 ino_t ufs_inode_by_name(struct inode *dir, const struct qstr *qstr)
 {
 	ino_t res = 0;
@@ -81,7 +75,7 @@ ino_t ufs_inode_by_name(struct inode *dir, const struct qstr *qstr)
 	de = ufs_find_entry(dir, qstr, &folio);
 	if (de) {
 		res = fs32_to_cpu(dir->i_sb, de->d_ino);
-		ufs_put_page(&folio->page);
+		folio_release_kmap(folio, de);
 	}
 	return res;
 }
@@ -104,7 +98,7 @@ void ufs_set_link(struct inode *dir, struct ufs_dir_entry *de,
 	ufs_set_de_type(dir->i_sb, de, inode->i_mode);
 
 	ufs_commit_chunk(folio, pos, len);
-	ufs_put_page(&folio->page);
+	folio_release_kmap(folio, de);
 	if (update_times)
 		inode_set_mtime_to_ts(dir, inode_set_ctime_current(dir));
 	mark_inode_dirty(dir);
@@ -197,7 +191,7 @@ static void *ufs_get_folio(struct inode *dir, unsigned long n,
 
 	if (IS_ERR(folio))
 		return ERR_CAST(folio);
-	kaddr = kmap(&folio->page);
+	kaddr = kmap_local_folio(folio, 0);
 	if (unlikely(!folio_test_checked(folio))) {
 		if (!ufs_check_folio(folio, kaddr))
 			goto fail;
@@ -206,7 +200,7 @@ static void *ufs_get_folio(struct inode *dir, unsigned long n,
 	return kaddr;
 
 fail:
-	ufs_put_page(&folio->page);
+	folio_release_kmap(folio, kaddr);
 	return ERR_PTR(-EIO);
 }
 
@@ -283,7 +277,7 @@ struct ufs_dir_entry *ufs_find_entry(struct inode *dir, const struct qstr *qstr,
 					goto found;
 				de = ufs_next_entry(sb, de);
 			}
-			ufs_put_page(&(*foliop)->page);
+			folio_release_kmap(*foliop, kaddr);
 		}
 		if (++n >= npages)
 			n = 0;
@@ -359,7 +353,7 @@ int ufs_add_link(struct dentry *dentry, struct inode *inode)
 			de = (struct ufs_dir_entry *) ((char *) de + rec_len);
 		}
 		folio_unlock(folio);
-		ufs_put_page(&folio->page);
+		folio_release_kmap(folio, kaddr);
 	}
 	BUG();
 	return -EINVAL;
@@ -390,7 +384,7 @@ int ufs_add_link(struct dentry *dentry, struct inode *inode)
 	err = ufs_handle_dirsync(dir);
 	/* OFFSET_CACHE */
 out_put:
-	ufs_put_page(&folio->page);
+	folio_release_kmap(folio, de);
 	return err;
 out_unlock:
 	folio_unlock(folio);
@@ -468,13 +462,13 @@ ufs_readdir(struct file *file, struct dir_context *ctx)
 					       ufs_get_de_namlen(sb, de),
 					       fs32_to_cpu(sb, de->d_ino),
 					       d_type)) {
-					ufs_put_page(&folio->page);
+					folio_release_kmap(folio, de);
 					return 0;
 				}
 			}
 			ctx->pos += fs16_to_cpu(sb, de->d_reclen);
 		}
-		ufs_put_page(&folio->page);
+		folio_release_kmap(folio, kaddr);
 	}
 	return 0;
 }
@@ -531,7 +525,7 @@ int ufs_delete_entry(struct inode *inode, struct ufs_dir_entry *dir,
 	mark_inode_dirty(inode);
 	err = ufs_handle_dirsync(inode);
 out:
-	ufs_put_page(&folio->page);
+	folio_release_kmap(folio, kaddr);
 	UFSD("EXIT\n");
 	return err;
 }
@@ -624,12 +618,12 @@ int ufs_empty_dir(struct inode * inode)
 			}
 			de = ufs_next_entry(sb, de);
 		}
-		ufs_put_page(&folio->page);
+		folio_release_kmap(folio, kaddr);
 	}
 	return 1;
 
 not_empty:
-	ufs_put_page(&folio->page);
+	folio_release_kmap(folio, kaddr);
 	return 0;
 }
 
diff --git a/fs/ufs/namei.c b/fs/ufs/namei.c
index a9b0c15de067..24bd12186647 100644
--- a/fs/ufs/namei.c
+++ b/fs/ufs/namei.c
@@ -306,23 +306,18 @@ static int ufs_rename(struct mnt_idmap *idmap, struct inode *old_dir,
 	if (dir_de) {
 		if (old_dir != new_dir)
 			ufs_set_link(old_inode, dir_de, dir_folio, new_dir, 0);
-		else {
-			kunmap(&dir_folio->page);
-			folio_put(dir_folio);
-		}
+		else
+			folio_release_kmap(dir_folio, new_dir);
 		inode_dec_link_count(old_dir);
 	}
 	return 0;
 
 
 out_dir:
-	if (dir_de) {
-		kunmap(&dir_folio->page);
-		folio_put(dir_folio);
-	}
+	if (dir_de)
+		folio_release_kmap(dir_folio, dir_de);
 out_old:
-	kunmap(&old_folio->page);
-	folio_put(old_folio);
+	folio_release_kmap(old_folio, old_de);
 out:
 	return err;
 }
-- 
2.43.0

Re: [PATCH 01/10] ufs: Convert ufs_get_page() to use a folio

[Al Viro]

On Tue, Jul 09, 2024 at 04:30:18AM +0100, Matthew Wilcox (Oracle) wrote:

> +	struct folio *folio = read_mapping_folio(mapping, n, NULL);
> +
> +	if (IS_ERR(folio))
> +		return &folio->page;

		return ERR_CAST(folio);
would be better here; yes, I realize it's going away in the next commit,
but it's easier to follow that way (and actually makes the next commit
easier to follow as well).

Re: [PATCH 00/10] Convert UFS directory handling to folios

[Al Viro]

On Tue, Jul 09, 2024 at 04:30:17AM +0100, Matthew Wilcox (Oracle) wrote:
> This patch series mirrors the changes to ext2 directory handling.
> It combines three distinct series of ext2 patches -- using kmap_local,
> Al's refactoring of the xxx_get_page() interfaces and the folio patches,
> and it does them in an order which is slightly more logical when you
> know that you're going to be doing all three of those conversions.
> 
> Compile tested only.  I can't find a mkfs.ufs / mkfs.ffs.  I found a
> Debian package called makefs, but couldn't figure out how to drive it
> the way that fstests wants to.

I can do testing; give me a day or two...