fscrypt: Allow fscrypt_decrypt_page() to function with non-writeback pages
Some filesystem might pass pages which do not have page->mapping->host
set to the encrypted inode. We want the caller to explicitly pass the
corresponding inode.
Signed-off-by: David Gstir <david@sigma-star.at>
Signed-off-by: Richard Weinberger <richard@nod.at>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
diff --git a/fs/crypto/crypto.c b/fs/crypto/crypto.c
index f38dc8a..222a705 100644
--- a/fs/crypto/crypto.c
+++ b/fs/crypto/crypto.c
@@ -271,7 +271,8 @@ EXPORT_SYMBOL(fscrypt_encrypt_page);
/**
* f2crypt_decrypt_page() - Decrypts a page in-place
- * @page: The page to decrypt. Must be locked.
+ * @inode: The encrypted inode to decrypt.
+ * @page: The page to decrypt. Must be locked.
*
* Decrypts page in-place using the ctx encryption context.
*
@@ -279,12 +280,12 @@ EXPORT_SYMBOL(fscrypt_encrypt_page);
*
* Return: Zero on success, non-zero otherwise.
*/
-int fscrypt_decrypt_page(struct page *page)
+int fscrypt_decrypt_page(struct inode *inode, struct page *page)
{
BUG_ON(!PageLocked(page));
- return do_page_crypto(page->mapping->host,
- FS_DECRYPT, page->index, page, page, GFP_NOFS);
+ return do_page_crypto(inode, FS_DECRYPT, page->index, page, page,
+ GFP_NOFS);
}
EXPORT_SYMBOL(fscrypt_decrypt_page);
@@ -419,7 +420,7 @@ static void completion_pages(struct work_struct *work)
bio_for_each_segment_all(bv, bio, i) {
struct page *page = bv->bv_page;
- int ret = fscrypt_decrypt_page(page);
+ int ret = fscrypt_decrypt_page(page->mapping->host, page);
if (ret) {
WARN_ON_ONCE(1);