1 files changed, 29 insertions, 1 deletions

diff --git a/include/uapi/linux/btrfs.h b/include/uapi/linux/btrfs.h
index 05aed70627e2..45e618921c61 100644
--- a/include/uapi/linux/btrfs.h
+++ b/include/uapi/linux/btrfs.h
@@ -305,6 +305,31 @@ struct btrfs_ioctl_clone_range_args {
 #define BTRFS_DEFRAG_RANGE_COMPRESS 1
 #define BTRFS_DEFRAG_RANGE_START_IO 2
 
+#define BTRFS_SAME_DATA_DIFFERS 1
+/* For extent-same ioctl */
+struct btrfs_ioctl_same_extent_info {
+        __s64 fd;               /* in - destination file */
+        __u64 logical_offset;   /* in - start of extent in destination */
+        __u64 bytes_deduped;    /* out - total # of bytes we were able
+                                 * to dedupe from this file */
+        /* status of this dedupe operation:
+         * 0 if dedup succeeds
+         * < 0 for error
+         * == BTRFS_SAME_DATA_DIFFERS if data differs
+         */
+        __s32 status;           /* out - see above description */
+        __u32 reserved;
+};
+
+struct btrfs_ioctl_same_args {
+        __u64 logical_offset;   /* in - start of extent in source */
+        __u64 length;           /* in - length of extent */
+        __u16 dest_count;       /* in - total elements in info array */
+        __u16 reserved1;
+        __u32 reserved2;
+        struct btrfs_ioctl_same_extent_info info[0];
+};
+
 struct btrfs_ioctl_space_info {
         __u64 flags;
         __u64 total_bytes;
@@ -524,7 +549,7 @@ static inline char *btrfs_err_str(enum btrfs_err_code err_code)
                                    struct btrfs_ioctl_search_args)
 #define BTRFS_IOC_INO_LOOKUP _IOWR(BTRFS_IOCTL_MAGIC, 18, \
                                    struct btrfs_ioctl_ino_lookup_args)
-#define BTRFS_IOC_DEFAULT_SUBVOL _IOW(BTRFS_IOCTL_MAGIC, 19, u64)
+#define BTRFS_IOC_DEFAULT_SUBVOL _IOW(BTRFS_IOCTL_MAGIC, 19, __u64)
 #define BTRFS_IOC_SPACE_INFO _IOWR(BTRFS_IOCTL_MAGIC, 20, \
                                     struct btrfs_ioctl_space_args)
 #define BTRFS_IOC_START_SYNC _IOR(BTRFS_IOCTL_MAGIC, 24, __u64)
@@ -579,4 +604,7 @@ static inline char *btrfs_err_str(enum btrfs_err_code err_code)
                                       struct btrfs_ioctl_get_dev_stats)
 #define BTRFS_IOC_DEV_REPLACE _IOWR(BTRFS_IOCTL_MAGIC, 53, \
                                     struct btrfs_ioctl_dev_replace_args)
+#define BTRFS_IOC_FILE_EXTENT_SAME _IOWR(BTRFS_IOCTL_MAGIC, 54, \
+                                         struct btrfs_ioctl_same_args)
+
 #endif /* _UAPI_LINUX_BTRFS_H */