X-Git-Url: http://review.tizen.org/git/?a=blobdiff_plain;f=ioctl.h;h=709e996f401c32fc625106fc15f105ba1fe7f835;hb=dc06cda3d6afb4fad5ddfd1508a33f79c2e68efb;hp=dafb756b632deeb3549cc66f74f6ad80097bdb28;hpb=bbda9a2892351ab14c90824c4c7b15c11c640512;p=platform%2Fupstream%2Fbtrfs-progs.git

diff --git a/ioctl.h b/ioctl.h
index dafb756..709e996 100644
--- a/ioctl.h
+++ b/ioctl.h
@@ -25,11 +25,17 @@ extern "C" {
 
 #include <asm/types.h>
 #include <linux/ioctl.h>
+#include <stddef.h>
 
 #ifndef __user
 #define __user
 #endif
 
+/* We don't want to include entire kerncompat.h */
+#ifndef BUILD_ASSERT
+#define BUILD_ASSERT(x)
+#endif
+
 #define BTRFS_IOCTL_MAGIC 0x94
 #define BTRFS_VOL_NAME_MAX 255
 
@@ -635,8 +641,8 @@ struct btrfs_ioctl_send_args {
 	__u64 reserved[4];		/* in */
 };
 /*
- * Size of structure depends on pointer width, was not caught.  Kernel handles
- * pointer width differences transparently
+ * Size of structure depends on pointer width, was not caught in the early
+ * days.  Kernel handles pointer width differences transparently.
  */
 BUILD_ASSERT(sizeof(__u64 *) == 8
 	     ? sizeof(struct btrfs_ioctl_send_args) == 72
@@ -644,6 +650,28 @@ BUILD_ASSERT(sizeof(__u64 *) == 8
 		? sizeof(struct btrfs_ioctl_send_args) == 68
 		: 0));
 
+/*
+ * Different pointer width leads to structure size change. Kernel should accept
+ * both ioctl values (derived from the structures) for backward compatibility.
+ * Size of this structure is same on 32bit and 64bit though.
+ *
+ * NOTE: do not use in your code, this is for testing only
+ */
+struct btrfs_ioctl_send_args_64 {
+	__s64 send_fd;			/* in */
+	__u64 clone_sources_count;	/* in */
+	union {
+		__u64 __user *clone_sources;	/* in */
+		__u64 __clone_sources_alignment;
+	};
+	__u64 parent_root;		/* in */
+	__u64 flags;			/* in */
+	__u64 reserved[4];		/* in */
+} __attribute__((packed));
+BUILD_ASSERT(sizeof(struct btrfs_ioctl_send_args_64) == 72);
+
+#define BTRFS_IOC_SEND_64_COMPAT_DEFINED 1
+
 /* Error codes as returned by the kernel */
 enum btrfs_err_code {
 	notused,
@@ -761,6 +789,11 @@ static inline char *btrfs_err_str(enum btrfs_err_code err_code)
 				struct btrfs_ioctl_received_subvol_args_32)
 #endif
 
+#ifdef BTRFS_IOC_SEND_64_COMPAT_DEFINED
+#define BTRFS_IOC_SEND_64 _IOW(BTRFS_IOCTL_MAGIC, 38, \
+		struct btrfs_ioctl_send_args_64)
+#endif
+
 #define BTRFS_IOC_SEND _IOW(BTRFS_IOCTL_MAGIC, 38, struct btrfs_ioctl_send_args)
 #define BTRFS_IOC_DEVICES_READY _IOR(BTRFS_IOCTL_MAGIC, 39, \
 				     struct btrfs_ioctl_vol_args)