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| author | Eric Biggers <ebiggers@google.com> | 2019-05-20 19:29:39 +0300 |
|---|---|---|
| committer | Eric Biggers <ebiggers@google.com> | 2019-05-28 20:27:52 +0300 |
| commit | d2d0727b1654e11563f181f4d3d48b9275514480 (patch) | |
| tree | fca4761fc4cf02a31f43aac5ae86e5276bbc298b /fs/crypto/fscrypt_private.h | |
| parent | cd6c84d8f0cdc911df435bb075ba22ce3c605b07 (diff) | |
| download | linux-d2d0727b1654e11563f181f4d3d48b9275514480.tar.xz | |
fscrypt: simplify bounce page handling
Currently, bounce page handling for writes to encrypted files is
unnecessarily complicated. A fscrypt_ctx is allocated along with each
bounce page, page_private(bounce_page) points to this fscrypt_ctx, and
fscrypt_ctx::w::control_page points to the original pagecache page.
However, because writes don't use the fscrypt_ctx for anything else,
there's no reason why page_private(bounce_page) can't just point to the
original pagecache page directly.
Therefore, this patch makes this change. In the process, it also cleans
up the API exposed to filesystems that allows testing whether a page is
a bounce page, getting the pagecache page from a bounce page, and
freeing a bounce page.
Reviewed-by: Chandan Rajendra <chandan@linux.ibm.com>
Signed-off-by: Eric Biggers <ebiggers@google.com>
Diffstat (limited to 'fs/crypto/fscrypt_private.h')
| -rw-r--r-- | fs/crypto/fscrypt_private.h | 4 |
1 files changed, 1 insertions, 3 deletions
diff --git a/fs/crypto/fscrypt_private.h b/fs/crypto/fscrypt_private.h index 7da276159593..4122ee1a0b7b 100644 --- a/fs/crypto/fscrypt_private.h +++ b/fs/crypto/fscrypt_private.h @@ -94,7 +94,6 @@ typedef enum { } fscrypt_direction_t; #define FS_CTX_REQUIRES_FREE_ENCRYPT_FL 0x00000001 -#define FS_CTX_HAS_BOUNCE_BUFFER_FL 0x00000002 static inline bool fscrypt_valid_enc_modes(u32 contents_mode, u32 filenames_mode) @@ -123,8 +122,7 @@ extern int fscrypt_do_page_crypto(const struct inode *inode, struct page *dest_page, unsigned int len, unsigned int offs, gfp_t gfp_flags); -extern struct page *fscrypt_alloc_bounce_page(struct fscrypt_ctx *ctx, - gfp_t gfp_flags); +extern struct page *fscrypt_alloc_bounce_page(gfp_t gfp_flags); extern const struct dentry_operations fscrypt_d_ops; extern void __printf(3, 4) __cold |