fs/btrfs/crc32c.h

   1 #include <asm/byteorder.h>
   2 #include <linux/crc32c.h>
   3 #include <linux/version.h>
   4
   5 /**
   6  * implementation of crc32c_le() changed in linux-2.6.23,
   7  * has of v0.13 btrfs-progs is using the latest version.
   8  * We must workaround older implementations of crc32c_le()
   9  * found on older kernel versions.
  10  */
  11 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
  12 #define btrfs_crc32c(seed, data, length) \
  13         __cpu_to_le32( crc32c( __le32_to_cpu(seed), data, length) )
  14 #else
  15 #define btrfs_crc32c(seed, data, length) \
  16         crc32c(seed, data, length)
  17 #endif