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authorEric Biggers <ebiggers@google.com>2019-05-20 19:29:39 +0300
committerEric Biggers <ebiggers@google.com>2019-05-28 20:27:52 +0300
commitd2d0727b1654e11563f181f4d3d48b9275514480 (patch)
treefca4761fc4cf02a31f43aac5ae86e5276bbc298b /fs/crypto/fscrypt_private.h
parentcd6c84d8f0cdc911df435bb075ba22ce3c605b07 (diff)
downloadlinux-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.h4
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