vfs: hoist the btrfs deduplication ioctl to the vfs
Hoist the btrfs EXTENT_SAME ioctl up to the VFS and make the name
more systematic (FIDEDUPERANGE).
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/include/uapi/linux/fs.h b/include/uapi/linux/fs.h
index cd5db7f..b38e647 100644
--- a/include/uapi/linux/fs.h
+++ b/include/uapi/linux/fs.h
@@ -52,6 +52,35 @@
__u64 minlen;
};
+/* extent-same (dedupe) ioctls; these MUST match the btrfs ioctl definitions */
+#define FILE_DEDUPE_RANGE_SAME 0
+#define FILE_DEDUPE_RANGE_DIFFERS 1
+
+/* from struct btrfs_ioctl_file_extent_same_info */
+struct file_dedupe_range_info {
+ __s64 dest_fd; /* in - destination file */
+ __u64 dest_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 for error
+ * == FILE_DEDUPE_RANGE_SAME if dedupe succeeds
+ * == FILE_DEDUPE_RANGE_DIFFERS if data differs
+ */
+ __s32 status; /* out - see above description */
+ __u32 reserved; /* must be zero */
+};
+
+/* from struct btrfs_ioctl_file_extent_same_args */
+struct file_dedupe_range {
+ __u64 src_offset; /* in - start of extent in source */
+ __u64 src_length; /* in - length of extent */
+ __u16 dest_count; /* in - total elements in info array */
+ __u16 reserved1; /* must be zero */
+ __u32 reserved2; /* must be zero */
+ struct file_dedupe_range_info info[0];
+};
+
/* And dynamically-tunable limits and defaults: */
struct files_stat_struct {
unsigned long nr_files; /* read only */
@@ -168,6 +197,7 @@
#define FITRIM _IOWR('X', 121, struct fstrim_range) /* Trim */
#define FICLONE _IOW(0x94, 9, int)
#define FICLONERANGE _IOW(0x94, 13, struct file_clone_range)
+#define FIDEDUPERANGE _IOWR(0x94, 54, struct file_dedupe_range)
#define FS_IOC_GETFLAGS _IOR('f', 1, long)
#define FS_IOC_SETFLAGS _IOW('f', 2, long)