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fscrypt: drop inode argument from fscrypt_get_ctx()

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The only reason the inode is being passed to fscrypt_get_ctx() is to
verify that the encryption key is available.  However, all callers
already ensure this because if we get as far as trying to do I/O to an
encrypted file without the key, there's already a bug.

Therefore, remove this unnecessary argument.

Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
Eric Biggers 2019-03-18 10:23:33 -07:00 committed by Theodore Ts'o
parent dc4060a5dc
commit cd0265fcd2
4 changed files with 9 additions and 16 deletions
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2
fs/crypto/bio.c
View file

@ -104,7 +104,7 @@ int fscrypt_zeroout_range(const struct inode *inode, pgoff_t lblk,
BUG_ON(inode->i_sb->s_blocksize != PAGE_SIZE);
ctx = fscrypt_get_ctx(inode, GFP_NOFS);
ctx = fscrypt_get_ctx(GFP_NOFS);
if (IS_ERR(ctx))
return PTR_ERR(ctx);

16
fs/crypto/crypto.c
View file

@ -87,23 +87,17 @@ EXPORT_SYMBOL(fscrypt_release_ctx);
/**
* fscrypt_get_ctx() - Gets an encryption context
* @inode: The inode for which we are doing the crypto
* @gfp_flags: The gfp flag for memory allocation
*
* Allocates and initializes an encryption context.
*
* Return: An allocated and initialized encryption context on success; error
* value or NULL otherwise.
* Return: A new encryption context on success; an ERR_PTR() otherwise.
*/
struct fscrypt_ctx *fscrypt_get_ctx(const struct inode *inode, gfp_t gfp_flags)
struct fscrypt_ctx *fscrypt_get_ctx(gfp_t gfp_flags)
{
struct fscrypt_ctx *ctx = NULL;
struct fscrypt_info *ci = inode->i_crypt_info;
struct fscrypt_ctx *ctx;
unsigned long flags;
if (ci == NULL)
return ERR_PTR(-ENOKEY);
/*
* We first try getting the ctx from a free list because in
* the common case the ctx will have an allocated and
@ -258,9 +252,9 @@ struct page *fscrypt_encrypt_page(const struct inode *inode,
BUG_ON(!PageLocked(page));
ctx = fscrypt_get_ctx(inode, gfp_flags);
ctx = fscrypt_get_ctx(gfp_flags);
if (IS_ERR(ctx))
return (struct page *)ctx;
return ERR_CAST(ctx);
/* The encryption operation will require a bounce page. */
ciphertext_page = fscrypt_alloc_bounce_page(ctx, gfp_flags);

2
fs/ext4/readpage.c
View file

@ -244,7 +244,7 @@ int ext4_mpage_readpages(struct address_space *mapping,
struct fscrypt_ctx *ctx = NULL;
if (IS_ENCRYPTED(inode) && S_ISREG(inode->i_mode)) {
ctx = fscrypt_get_ctx(inode, GFP_NOFS);
ctx = fscrypt_get_ctx(GFP_NOFS);
if (IS_ERR(ctx))
goto set_error_page;
}

5
include/linux/fscrypt.h
View file

@ -90,7 +90,7 @@ static inline bool fscrypt_dummy_context_enabled(struct inode *inode)
/* crypto.c */
extern void fscrypt_enqueue_decrypt_work(struct work_struct *);
extern struct fscrypt_ctx *fscrypt_get_ctx(const struct inode *, gfp_t);
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,
@ -247,8 +247,7 @@ static inline void fscrypt_enqueue_decrypt_work(struct work_struct *work)
{
}
static inline struct fscrypt_ctx *fscrypt_get_ctx(const struct inode *inode,
gfp_t gfp_flags)
static inline struct fscrypt_ctx *fscrypt_get_ctx(gfp_t gfp_flags)
{
return ERR_PTR(-EOPNOTSUPP);
}