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f2fs crypto: use per-inode tfm structure

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This patch applies the following ext4 patch:

  ext4 crypto: use per-inode tfm structure

As suggested by Herbert Xu, we shouldn't allocate a new tfm each time
we read or write a page.  Instead we can use a single tfm hanging off
the inode's crypt_info structure for all of our encryption needs for
that inode, since the tfm can be used by multiple crypto requests in
parallel.

Also use cmpxchg() to avoid races that could result in crypt_info
structure getting doubly allocated or doubly freed.

Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Jaegeuk Kim
2015-05-19 22:26:54 -07:00
parent da554e48ca
commit 26bf3dc7e2
9 changed files with 96 additions and 167 deletions
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fs/f2fs/f2fs.h
+1 -4
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@@ -2016,7 +2016,7 @@ int f2fs_decrypt_one(struct inode *, struct page *);
void f2fs_end_io_crypto_work(struct f2fs_crypto_ctx *, struct bio *);
/* crypto_key.c */
void f2fs_free_encryption_info(struct inode *);
void f2fs_free_encryption_info(struct inode *, struct f2fs_crypt_info *);
int _f2fs_get_encryption_info(struct inode *inode);
/* crypto_fname.c */
@@ -2051,7 +2051,6 @@ static inline int f2fs_get_encryption_info(struct inode *inode)
return 0;
}
int f2fs_setup_fname_crypto(struct inode *);
void f2fs_fname_crypto_free_buffer(struct f2fs_str *);
int f2fs_fname_setup_filename(struct inode *, const struct qstr *,
int lookup, struct f2fs_filename *);
@@ -2065,8 +2064,6 @@ static inline void f2fs_exit_crypto(void) { }
static inline int f2fs_has_encryption_key(struct inode *i) { return 0; }
static inline int f2fs_get_encryption_info(struct inode *i) { return 0; }
static inline int f2fs_setup_fname_crypto(struct inode *i) { return 0; }
static inline void f2fs_fname_crypto_free_buffer(struct f2fs_str *p) { }
static inline int f2fs_fname_setup_filename(struct inode *dir,