1 files changed, 118 insertions, 33 deletions

diff --git a/include/linux/fscrypt.h b/include/linux/fscrypt.h
index f7680ef1abd2..f622f7460ed8 100644
--- a/include/linux/fscrypt.h
+++ b/include/linux/fscrypt.h
@@ -16,6 +16,7 @@
 #include <linux/fs.h>
 #include <linux/mm.h>
 #include <linux/slab.h>
+#include <uapi/linux/fscrypt.h>
 
 #define FS_CRYPTO_BLOCK_SIZE		16
 
@@ -42,7 +43,7 @@ struct fscrypt_name {
 #define fname_len(p)		((p)->disk_name.len)
 
 /* Maximum value for the third parameter of fscrypt_operations.set_context(). */
-#define FSCRYPT_SET_CONTEXT_MAX_SIZE	28
+#define FSCRYPT_SET_CONTEXT_MAX_SIZE	40
 
 #ifdef CONFIG_FS_ENCRYPTION
 /*
@@ -63,16 +64,13 @@ struct fscrypt_operations {
 	unsigned int max_namelen;
 };
 
+/* Decryption work */
 struct fscrypt_ctx {
 	union {
 		struct {
-			struct page *bounce_page;	/* Ciphertext page */
-			struct page *control_page;	/* Original page  */
-		} w;
-		struct {
 			struct bio *bio;
 			struct work_struct work;
-		} r;
+		};
 		struct list_head free_list;	/* Free list */
 	};
 	u8 flags;				/* Flags */
@@ -106,29 +104,54 @@ static inline void fscrypt_handle_d_move(struct dentry *dentry)
 extern void fscrypt_enqueue_decrypt_work(struct work_struct *);
 extern struct fscrypt_ctx *fscrypt_get_ctx(gfp_t);
 extern void fscrypt_release_ctx(struct fscrypt_ctx *);
-extern struct page *fscrypt_encrypt_page(const struct inode *, struct page *,
-						unsigned int, unsigned int,
-						u64, gfp_t);
-extern int fscrypt_decrypt_page(const struct inode *, struct page *, unsigned int,
-				unsigned int, u64);
 
-static inline struct page *fscrypt_control_page(struct page *page)
+extern struct page *fscrypt_encrypt_pagecache_blocks(struct page *page,
+						     unsigned int len,
+						     unsigned int offs,
+						     gfp_t gfp_flags);
+extern int fscrypt_encrypt_block_inplace(const struct inode *inode,
+					 struct page *page, unsigned int len,
+					 unsigned int offs, u64 lblk_num,
+					 gfp_t gfp_flags);
+
+extern int fscrypt_decrypt_pagecache_blocks(struct page *page, unsigned int len,
+					    unsigned int offs);
+extern int fscrypt_decrypt_block_inplace(const struct inode *inode,
+					 struct page *page, unsigned int len,
+					 unsigned int offs, u64 lblk_num);
+
+static inline bool fscrypt_is_bounce_page(struct page *page)
+{
+	return page->mapping == NULL;
+}
+
+static inline struct page *fscrypt_pagecache_page(struct page *bounce_page)
 {
-	return ((struct fscrypt_ctx *)page_private(page))->w.control_page;
+	return (struct page *)page_private(bounce_page);
 }
 
-extern void fscrypt_restore_control_page(struct page *);
+extern void fscrypt_free_bounce_page(struct page *bounce_page);
 
 /* policy.c */
 extern int fscrypt_ioctl_set_policy(struct file *, const void __user *);
 extern int fscrypt_ioctl_get_policy(struct file *, void __user *);
+extern int fscrypt_ioctl_get_policy_ex(struct file *, void __user *);
 extern int fscrypt_has_permitted_context(struct inode *, struct inode *);
 extern int fscrypt_inherit_context(struct inode *, struct inode *,
 					void *, bool);
-/* keyinfo.c */
+/* keyring.c */
+extern void fscrypt_sb_free(struct super_block *sb);
+extern int fscrypt_ioctl_add_key(struct file *filp, void __user *arg);
+extern int fscrypt_ioctl_remove_key(struct file *filp, void __user *arg);
+extern int fscrypt_ioctl_remove_key_all_users(struct file *filp,
+					      void __user *arg);
+extern int fscrypt_ioctl_get_key_status(struct file *filp, void __user *arg);
+
+/* keysetup.c */
 extern int fscrypt_get_encryption_info(struct inode *);
 extern void fscrypt_put_encryption_info(struct inode *);
 extern void fscrypt_free_inode(struct inode *);
+extern int fscrypt_drop_inode(struct inode *inode);
 
 /* fname.c */
 extern int fscrypt_setup_filename(struct inode *, const struct qstr *,
@@ -223,7 +246,6 @@ static inline bool fscrypt_match_name(const struct fscrypt_name *fname,
 extern void fscrypt_decrypt_bio(struct bio *);
 extern void fscrypt_enqueue_decrypt_bio(struct fscrypt_ctx *ctx,
 					struct bio *bio);
-extern void fscrypt_pullback_bio_page(struct page **, bool);
 extern int fscrypt_zeroout_range(const struct inode *, pgoff_t, sector_t,
 				 unsigned int);
 
@@ -283,32 +305,51 @@ static inline void fscrypt_release_ctx(struct fscrypt_ctx *ctx)
 	return;
 }
 
-static inline struct page *fscrypt_encrypt_page(const struct inode *inode,
+static inline struct page *fscrypt_encrypt_pagecache_blocks(struct page *page,
+							    unsigned int len,
+							    unsigned int offs,
+							    gfp_t gfp_flags)
+{
+	return ERR_PTR(-EOPNOTSUPP);
+}
+
+static inline int fscrypt_encrypt_block_inplace(const struct inode *inode,
 						struct page *page,
 						unsigned int len,
-						unsigned int offs,
-						u64 lblk_num, gfp_t gfp_flags)
+						unsigned int offs, u64 lblk_num,
+						gfp_t gfp_flags)
 {
-	return ERR_PTR(-EOPNOTSUPP);
+	return -EOPNOTSUPP;
+}
+
+static inline int fscrypt_decrypt_pagecache_blocks(struct page *page,
+						   unsigned int len,
+						   unsigned int offs)
+{
+	return -EOPNOTSUPP;
 }
 
-static inline int fscrypt_decrypt_page(const struct inode *inode,
-				       struct page *page,
-				       unsigned int len, unsigned int offs,
-				       u64 lblk_num)
+static inline int fscrypt_decrypt_block_inplace(const struct inode *inode,
+						struct page *page,
+						unsigned int len,
+						unsigned int offs, u64 lblk_num)
 {
 	return -EOPNOTSUPP;
 }
 
-static inline struct page *fscrypt_control_page(struct page *page)
+static inline bool fscrypt_is_bounce_page(struct page *page)
+{
+	return false;
+}
+
+static inline struct page *fscrypt_pagecache_page(struct page *bounce_page)
 {
 	WARN_ON_ONCE(1);
 	return ERR_PTR(-EINVAL);
 }
 
-static inline void fscrypt_restore_control_page(struct page *page)
+static inline void fscrypt_free_bounce_page(struct page *bounce_page)
 {
-	return;
 }
 
 /* policy.c */
@@ -323,6 +364,12 @@ static inline int fscrypt_ioctl_get_policy(struct file *filp, void __user *arg)
 	return -EOPNOTSUPP;
 }
 
+static inline int fscrypt_ioctl_get_policy_ex(struct file *filp,
+					      void __user *arg)
+{
+	return -EOPNOTSUPP;
+}
+
 static inline int fscrypt_has_permitted_context(struct inode *parent,
 						struct inode *child)
 {
@@ -336,7 +383,34 @@ static inline int fscrypt_inherit_context(struct inode *parent,
 	return -EOPNOTSUPP;
 }
 
-/* keyinfo.c */
+/* keyring.c */
+static inline void fscrypt_sb_free(struct super_block *sb)
+{
+}
+
+static inline int fscrypt_ioctl_add_key(struct file *filp, void __user *arg)
+{
+	return -EOPNOTSUPP;
+}
+
+static inline int fscrypt_ioctl_remove_key(struct file *filp, void __user *arg)
+{
+	return -EOPNOTSUPP;
+}
+
+static inline int fscrypt_ioctl_remove_key_all_users(struct file *filp,
+						     void __user *arg)
+{
+	return -EOPNOTSUPP;
+}
+
+static inline int fscrypt_ioctl_get_key_status(struct file *filp,
+					       void __user *arg)
+{
+	return -EOPNOTSUPP;
+}
+
+/* keysetup.c */
 static inline int fscrypt_get_encryption_info(struct inode *inode)
 {
 	return -EOPNOTSUPP;
@@ -351,6 +425,11 @@ static inline void fscrypt_free_inode(struct inode *inode)
 {
 }
 
+static inline int fscrypt_drop_inode(struct inode *inode)
+{
+	return 0;
+}
+
  /* fname.c */
 static inline int fscrypt_setup_filename(struct inode *dir,
 					 const struct qstr *iname,
@@ -410,11 +489,6 @@ static inline void fscrypt_enqueue_decrypt_bio(struct fscrypt_ctx *ctx,
 {
 }
 
-static inline void fscrypt_pullback_bio_page(struct page **page, bool restore)
-{
-	return;
-}
-
 static inline int fscrypt_zeroout_range(const struct inode *inode, pgoff_t lblk,
 					sector_t pblk, unsigned int len)
 {
@@ -692,4 +766,15 @@ static inline int fscrypt_encrypt_symlink(struct inode *inode,
 	return 0;
 }
 
+/* If *pagep is a bounce page, free it and set *pagep to the pagecache page */
+static inline void fscrypt_finalize_bounce_page(struct page **pagep)
+{
+	struct page *page = *pagep;
+
+	if (fscrypt_is_bounce_page(page)) {
+		*pagep = fscrypt_pagecache_page(page);
+		fscrypt_free_bounce_page(page);
+	}
+}
+
 #endif	/* _LINUX_FSCRYPT_H */