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ext4 crypto: ext4_page_crypto() doesn't need a encryption context

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Since ext4_page_crypto() doesn't need an encryption context (at least
not any more), this allows us to simplify a number function signature
and also allows us to avoid needing to allocate a context in
ext4_block_write_begin().  It also means we no longer need a separate
ext4_decrypt_one() function.

Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
Theodore Ts'o 2015-10-03 10:49:26 -04:00
parent cccd147a57
commit 3684de8ca2
4 changed files with 9 additions and 28 deletions
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28
fs/ext4/crypto.c
View File

@ -253,8 +253,7 @@ typedef enum {
EXT4_ENCRYPT,
} ext4_direction_t;
static int ext4_page_crypto(struct ext4_crypto_ctx *ctx,
struct inode *inode,
static int ext4_page_crypto(struct inode *inode,
ext4_direction_t rw,
pgoff_t index,
struct page *src_page,
@ -353,7 +352,7 @@ struct page *ext4_encrypt(struct inode *inode,
if (IS_ERR(ciphertext_page))
goto errout;
ctx->w.control_page = plaintext_page;
err = ext4_page_crypto(ctx, inode, EXT4_ENCRYPT, plaintext_page->index,
err = ext4_page_crypto(inode, EXT4_ENCRYPT, plaintext_page->index,
plaintext_page, ciphertext_page);
if (err) {
ciphertext_page = ERR_PTR(err);
@ -378,31 +377,14 @@ struct page *ext4_encrypt(struct inode *inode,
*
* Return: Zero on success, non-zero otherwise.
*/
int ext4_decrypt(struct ext4_crypto_ctx *ctx, struct page *page)
int ext4_decrypt(struct page *page)
{
BUG_ON(!PageLocked(page));
return ext4_page_crypto(ctx, page->mapping->host,
return ext4_page_crypto(page->mapping->host,
EXT4_DECRYPT, page->index, page, page);
}
/*
* Convenience function which takes care of allocating and
* deallocating the encryption context
*/
int ext4_decrypt_one(struct inode *inode, struct page *page)
{
int ret;
struct ext4_crypto_ctx *ctx = ext4_get_crypto_ctx(inode);
if (IS_ERR(ctx))
return PTR_ERR(ctx);
ret = ext4_decrypt(ctx, page);
ext4_release_crypto_ctx(ctx);
return ret;
}
int ext4_encrypted_zeroout(struct inode *inode, struct ext4_extent *ex)
{
struct ext4_crypto_ctx *ctx;
@ -426,7 +408,7 @@ int ext4_encrypted_zeroout(struct inode *inode, struct ext4_extent *ex)
}
while (len--) {
err = ext4_page_crypto(ctx, inode, EXT4_ENCRYPT, lblk,
err = ext4_page_crypto(inode, EXT4_ENCRYPT, lblk,
ZERO_PAGE(0), ciphertext_page);
if (err)
goto errout;

3
fs/ext4/ext4.h
View File

@ -2063,8 +2063,7 @@ void ext4_release_crypto_ctx(struct ext4_crypto_ctx *ctx);
void ext4_restore_control_page(struct page *data_page);
struct page *ext4_encrypt(struct inode *inode,
struct page *plaintext_page);
int ext4_decrypt(struct ext4_crypto_ctx *ctx, struct page *page);
int ext4_decrypt_one(struct inode *inode, struct page *page);
int ext4_decrypt(struct page *page);
int ext4_encrypted_zeroout(struct inode *inode, struct ext4_extent *ex);
#ifdef CONFIG_EXT4_FS_ENCRYPTION

4
fs/ext4/inode.c
View File

@ -965,7 +965,7 @@ static int ext4_block_write_begin(struct page *page, loff_t pos, unsigned len,
if (unlikely(err))
page_zero_new_buffers(page, from, to);
else if (decrypt)
err = ext4_decrypt_one(inode, page);
err = ext4_decrypt(page);
return err;
}
#endif
@ -3404,7 +3404,7 @@ static int __ext4_block_zero_page_range(handle_t *handle,
/* We expect the key to be set. */
BUG_ON(!ext4_has_encryption_key(inode));
BUG_ON(blocksize != PAGE_CACHE_SIZE);
WARN_ON_ONCE(ext4_decrypt_one(inode, page));
WARN_ON_ONCE(ext4_decrypt(page));
}
}
if (ext4_should_journal_data(inode)) {

2
fs/ext4/readpage.c
View File

@ -62,7 +62,7 @@ static void completion_pages(struct work_struct *work)
bio_for_each_segment_all(bv, bio, i) {
struct page *page = bv->bv_page;
int ret = ext4_decrypt(ctx, page);
int ret = ext4_decrypt(page);
if (ret) {
WARN_ON_ONCE(1);
SetPageError(page);