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fscrypt: Allow fscrypt_decrypt_page() to function with non-writeback pages

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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>
This commit is contained in:
David Gstir 2016-11-13 22:20:45 +01:00 committed by Theodore Ts'o
parent 1c7dcf69ee
commit b50f7b268b
3 changed files with 12 additions and 9 deletions
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11
fs/crypto/crypto.c
View File

@ -271,7 +271,8 @@ EXPORT_SYMBOL(fscrypt_encrypt_page);
/** /**
* f2crypt_decrypt_page() - Decrypts a page in-place * 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. * 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. * 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)); BUG_ON(!PageLocked(page));
return do_page_crypto(page->mapping->host, return do_page_crypto(inode, FS_DECRYPT, page->index, page, page,
FS_DECRYPT, page->index, page, page, GFP_NOFS); GFP_NOFS);
} }
EXPORT_SYMBOL(fscrypt_decrypt_page); 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) { bio_for_each_segment_all(bv, bio, i) {
struct page *page = bv->bv_page; struct page *page = bv->bv_page;
int ret = fscrypt_decrypt_page(page); int ret = fscrypt_decrypt_page(page->mapping->host, page);
if (ret) { if (ret) {
WARN_ON_ONCE(1); WARN_ON_ONCE(1);

5
fs/ext4/inode.c
View File

@ -1166,7 +1166,7 @@ static int ext4_block_write_begin(struct page *page, loff_t pos, unsigned len,
if (unlikely(err)) if (unlikely(err))
page_zero_new_buffers(page, from, to); page_zero_new_buffers(page, from, to);
else if (decrypt) else if (decrypt)
err = fscrypt_decrypt_page(page); err = fscrypt_decrypt_page(page->mapping->host, page);
return err; return err;
} }
#endif #endif
@ -3743,7 +3743,8 @@ static int __ext4_block_zero_page_range(handle_t *handle,
/* We expect the key to be set. */ /* We expect the key to be set. */
BUG_ON(!fscrypt_has_encryption_key(inode)); BUG_ON(!fscrypt_has_encryption_key(inode));
BUG_ON(blocksize != PAGE_SIZE); BUG_ON(blocksize != PAGE_SIZE);
WARN_ON_ONCE(fscrypt_decrypt_page(page)); WARN_ON_ONCE(fscrypt_decrypt_page(page->mapping->host,
page));
} }
} }
if (ext4_should_journal_data(inode)) { if (ext4_should_journal_data(inode)) {

5
include/linux/fscrypto.h
View File

@ -249,7 +249,7 @@ int fscrypt_initialize(void);
extern struct fscrypt_ctx *fscrypt_get_ctx(struct inode *, gfp_t); extern struct fscrypt_ctx *fscrypt_get_ctx(struct inode *, gfp_t);
extern void fscrypt_release_ctx(struct fscrypt_ctx *); extern void fscrypt_release_ctx(struct fscrypt_ctx *);
extern struct page *fscrypt_encrypt_page(struct inode *, struct page *, gfp_t); extern struct page *fscrypt_encrypt_page(struct inode *, struct page *, gfp_t);
extern int fscrypt_decrypt_page(struct page *); extern int fscrypt_decrypt_page(struct inode *, struct page *);
extern void fscrypt_decrypt_bio_pages(struct fscrypt_ctx *, struct bio *); extern void fscrypt_decrypt_bio_pages(struct fscrypt_ctx *, struct bio *);
extern void fscrypt_pullback_bio_page(struct page **, bool); extern void fscrypt_pullback_bio_page(struct page **, bool);
extern void fscrypt_restore_control_page(struct page *); extern void fscrypt_restore_control_page(struct page *);
@ -298,7 +298,8 @@ static inline struct page *fscrypt_notsupp_encrypt_page(struct inode *i,
return ERR_PTR(-EOPNOTSUPP); return ERR_PTR(-EOPNOTSUPP);
} }
static inline int fscrypt_notsupp_decrypt_page(struct page *p) static inline int fscrypt_notsupp_decrypt_page(struct inode *i,
struct page *p)
{ {
return -EOPNOTSUPP; return -EOPNOTSUPP;
} }