1 files changed, 5 insertions, 4 deletions

diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index caea9eed9d62..b4da53d55c82 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -714,7 +714,8 @@ static long btrfs_ioctl_clone(struct file *file, unsigned long srcfd,
         u64 len = olen;
         u64 bs = root->fs_info->sb->s_blocksize;
         u64 hint_byte;
-
+        u16 csum_size =
+                btrfs_super_csum_size(&root->fs_info->super_copy);
         /*
          * TODO:
          * - split compressed inline extents.  annoying: we need to
@@ -964,7 +965,7 @@ static long btrfs_ioctl_clone(struct file *file, unsigned long srcfd,
                         int coff, clen;
 
                         size = btrfs_item_size_nr(leaf, slot);
-                        coverslen = (size / BTRFS_CRC32_SIZE) <<
+                        coverslen = (size / csum_size) <<
                                 root->fs_info->sb->s_blocksize_bits;
                         printk("csums for %llu~%llu\n",
                                key.offset, coverslen);
@@ -981,12 +982,12 @@ static long btrfs_ioctl_clone(struct file *file, unsigned long srcfd,
                         if (off > key.offset)
                                 coff = ((off - key.offset) >>
                                         root->fs_info->sb->s_blocksize_bits) *
-                                        BTRFS_CRC32_SIZE;
+                                        csum_size;
                         clen = size - coff;
                         if (key.offset + coverslen > off+len)
                                 clen -= ((key.offset+coverslen-off-len) >>
                                          root->fs_info->sb->s_blocksize_bits) *
-                                        BTRFS_CRC32_SIZE;
+                                        csum_size;
                         printk(" will dup %d~%d of %d\n",
                                coff, clen, size);