Btrfs: Add mount -o nodatasum to turn of file data checksumming

Signed-off-by: Chris Mason <chris.mason@oracle.com>

1 files changed, 8 insertions, 6 deletions

diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index 052555ced44d..5e255cabfd10 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -321,6 +321,7 @@ struct btrfs_fs_info {
 
         u64 generation;
         u64 last_trans_committed;
+        unsigned long mount_opt;
         struct btrfs_transaction *running_transaction;
         struct btrfs_super_block super_copy;
         struct extent_buffer *sb_buffer;
@@ -429,6 +430,13 @@ struct btrfs_root {
  */
 #define BTRFS_STRING_ITEM_KEY   253
 
+#define BTRFS_MOUNT_NODATASUM           0x1
+
+#define btrfs_clear_opt(o, opt)         ((o) &= ~BTRFS_MOUNT_##opt)
+#define btrfs_set_opt(o, opt)           ((o) |= BTRFS_MOUNT_##opt)
+#define btrfs_test_opt(root, opt)       ((root)->fs_info->mount_opt & \
+                                         BTRFS_MOUNT_##opt)
+
 /* some macros to generate set/get funcs for the struct fields.  This
  * assumes there is a lefoo_to_cpu for every type, so lets make a simple
  * one for u8:
@@ -906,12 +914,6 @@ static inline u32 btrfs_level_size(struct btrfs_root *root, int level) {
         ((unsigned long)(btrfs_leaf_data(leaf) + \
         btrfs_item_offset_nr(leaf, slot)))
 
-/* mount option defines and helpers */
-#define BTRFS_MOUNT_SUBVOL              0x000001
-#define btrfs_clear_opt(o, opt)         o &= ~BTRFS_MOUNT_##opt
-#define btrfs_set_opt(o, opt)           o |= BTRFS_MOUNT_##opt
-#define btrfs_test_opt(sb, opt)         (BTRFS_SB(sb)->s_mount_opt & \
-                                         BTRFS_MOUNT_##opt)
 /* extent-tree.c */
 int btrfs_extent_post_op(struct btrfs_trans_handle *trans,
                          struct btrfs_root *root);