ecryptfs: Convert ecryptfs_encrypt_page() to take a folio

All three callers have a folio, so pass it in and use it throughout.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Link: https://lore.kernel.org/r/20241025190822.1319162-8-willy@infradead.org
Signed-off-by: Christian Brauner <brauner@kernel.org>

Author: Matthew Wilcox (Oracle)

fs/ecryptfs/crypto.c

@@ -392,7 +392,7 @@ static int crypt_extent(struct ecryptfs_crypt_stat *crypt_stat,
 
 /**
  * ecryptfs_encrypt_page
- * @page: Page mapped from the eCryptfs inode for the file; contains
+ * @folio: Folio mapped from the eCryptfs inode for the file; contains
  *        decrypted content that needs to be encrypted (to a temporary
  *        page; not in place) and written out to the lower file
  *
@@ -406,7 +406,7 @@ static int crypt_extent(struct ecryptfs_crypt_stat *crypt_stat,
  *
  * Returns zero on success; negative on error
  */
-int ecryptfs_encrypt_page(struct page *page)
+int ecryptfs_encrypt_page(struct folio *folio)
 {
 	struct inode *ecryptfs_inode;
 	struct ecryptfs_crypt_stat *crypt_stat;
@@ -416,7 +416,7 @@ int ecryptfs_encrypt_page(struct page *page)
 	loff_t lower_offset;
 	int rc = 0;
 
-	ecryptfs_inode = page->mapping->host;
+	ecryptfs_inode = folio->mapping->host;
 	crypt_stat =
 		&(ecryptfs_inode_to_private(ecryptfs_inode)->crypt_stat);
 	BUG_ON(!(crypt_stat->flags & ECRYPTFS_ENCRYPTED));
@@ -431,16 +431,16 @@ int ecryptfs_encrypt_page(struct page *page)
 	for (extent_offset = 0;
 	     extent_offset < (PAGE_SIZE / crypt_stat->extent_size);
 	     extent_offset++) {
-		rc = crypt_extent(crypt_stat, enc_extent_page, page,
-				  extent_offset, ENCRYPT);
+		rc = crypt_extent(crypt_stat, enc_extent_page,
+				folio_page(folio, 0), extent_offset, ENCRYPT);
 		if (rc) {
 			printk(KERN_ERR "%s: Error encrypting extent; "
 			       "rc = [%d]\n", __func__, rc);
 			goto out;
 		}
 	}
 
-	lower_offset = lower_offset_for_page(crypt_stat, page);
+	lower_offset = lower_offset_for_page(crypt_stat, &folio->page);
 	enc_extent_virt = kmap_local_page(enc_extent_page);
 	rc = ecryptfs_write_lower(ecryptfs_inode, enc_extent_virt, lower_offset,
 				  PAGE_SIZE);

fs/ecryptfs/ecryptfs_kernel.h

@@ -569,7 +569,7 @@ void ecryptfs_destroy_mount_crypt_stat(
 	struct ecryptfs_mount_crypt_stat *mount_crypt_stat);
 int ecryptfs_init_crypt_ctx(struct ecryptfs_crypt_stat *crypt_stat);
 int ecryptfs_write_inode_size_to_metadata(struct inode *ecryptfs_inode);
-int ecryptfs_encrypt_page(struct page *page);
+int ecryptfs_encrypt_page(struct folio *folio);
 int ecryptfs_decrypt_page(struct page *page);
 int ecryptfs_write_metadata(struct dentry *ecryptfs_dentry,
 			    struct inode *ecryptfs_inode);

fs/ecryptfs/mmap.c

@@ -34,7 +34,7 @@ static int ecryptfs_writepages(struct address_space *mapping,
 	int error;
 
 	while ((folio = writeback_iter(mapping, wbc, folio, &error))) {
-		error = ecryptfs_encrypt_page(&folio->page);
+		error = ecryptfs_encrypt_page(folio);
 		if (error) {
 			ecryptfs_printk(KERN_WARNING,
 				"Error encrypting folio (index [0x%.16lx])\n",
@@ -476,7 +476,7 @@ static int ecryptfs_write_end(struct file *file,
 			"zeros in page with index = [0x%.16lx]\n", index);
 		goto out;
 	}
-	rc = ecryptfs_encrypt_page(&folio->page);
+	rc = ecryptfs_encrypt_page(folio);
 	if (rc) {
 		ecryptfs_printk(KERN_WARNING, "Error encrypting page (upper "
 				"index [0x%.16lx])\n", index);

fs/ecryptfs/read_write.c

@@ -168,7 +168,7 @@ int ecryptfs_write(struct inode *ecryptfs_inode, char *data, loff_t offset,
 		folio_mark_uptodate(ecryptfs_folio);
 		folio_unlock(ecryptfs_folio);
 		if (crypt_stat->flags & ECRYPTFS_ENCRYPTED)
-			rc = ecryptfs_encrypt_page(&ecryptfs_folio->page);
+			rc = ecryptfs_encrypt_page(ecryptfs_folio);
 		else
 			rc = ecryptfs_write_lower_page_segment(ecryptfs_inode,
 						ecryptfs_folio,