f2fs: clean up hash codes

f2fs_chksum and f2fs_crc32 use the same 'crc32' crypto engine, also
their implementation are almost the same, except with different
shash description context.

Introduce __f2fs_crc32 to wrap the common codes, and reuse it in
f2fs_chksum and f2fs_crc32.

Signed-off-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index 9b967eb..55fb18e 100644 (file)
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -1255,33 +1255,7 @@ static inline bool is_idle(struct f2fs_sb_info *sbi)
 /*
  * Inline functions
  */
-static inline u32 f2fs_crc32(struct f2fs_sb_info *sbi, const void *address,
-                          unsigned int length)
-{
-       SHASH_DESC_ON_STACK(shash, sbi->s_chksum_driver);
-       u32 *ctx = (u32 *)shash_desc_ctx(shash);
-       u32 retval;
-       int err;
-
-       shash->tfm = sbi->s_chksum_driver;
-       shash->flags = 0;
-       *ctx = F2FS_SUPER_MAGIC;
-
-       err = crypto_shash_update(shash, address, length);
-       BUG_ON(err);
-
-       retval = *ctx;
-       barrier_data(ctx);
-       return retval;
-}
-
-static inline bool f2fs_crc_valid(struct f2fs_sb_info *sbi, __u32 blk_crc,
-                                 void *buf, size_t buf_size)
-{
-       return f2fs_crc32(sbi, buf, buf_size) == blk_crc;
-}
-
-static inline u32 f2fs_chksum(struct f2fs_sb_info *sbi, u32 crc,
+static inline u32 __f2fs_crc32(struct f2fs_sb_info *sbi, u32 crc,
                              const void *address, unsigned int length)
 {
        struct {
@@ -1302,6 +1276,24 @@ static inline u32 f2fs_chksum(struct f2fs_sb_info *sbi, u32 crc,
        return *(u32 *)desc.ctx;
 }
 
+static inline u32 f2fs_crc32(struct f2fs_sb_info *sbi, const void *address,
+                          unsigned int length)
+{
+       return __f2fs_crc32(sbi, F2FS_SUPER_MAGIC, address, length);
+}
+
+static inline bool f2fs_crc_valid(struct f2fs_sb_info *sbi, __u32 blk_crc,
+                                 void *buf, size_t buf_size)
+{
+       return f2fs_crc32(sbi, buf, buf_size) == blk_crc;
+}
+
+static inline u32 f2fs_chksum(struct f2fs_sb_info *sbi, u32 crc,
+                             const void *address, unsigned int length)
+{
+       return __f2fs_crc32(sbi, crc, address, length);
+}
+
 static inline struct f2fs_inode_info *F2FS_I(struct inode *inode)
 {
        return container_of(inode, struct f2fs_inode_info, vfs_inode);