+#define BTRFS_QUOTA_CTL_ENABLE 1
+#define BTRFS_QUOTA_CTL_DISABLE 2
+/* 3 has formerly been reserved for BTRFS_QUOTA_CTL_RESCAN */
+struct btrfs_ioctl_quota_ctl_args {
+ __u64 cmd;
+ __u64 status;
+};
+BUILD_ASSERT(sizeof(struct btrfs_ioctl_quota_ctl_args) == 16);
+
+struct btrfs_ioctl_quota_rescan_args {
+ __u64 flags;
+ __u64 progress;
+ __u64 reserved[6];
+};
+BUILD_ASSERT(sizeof(struct btrfs_ioctl_quota_rescan_args) == 64);
+
+struct btrfs_ioctl_qgroup_assign_args {
+ __u64 assign;
+ __u64 src;
+ __u64 dst;
+};
+
+struct btrfs_ioctl_qgroup_create_args {
+ __u64 create;
+ __u64 qgroupid;
+};
+BUILD_ASSERT(sizeof(struct btrfs_ioctl_qgroup_create_args) == 16);
+
+struct btrfs_ioctl_timespec {
+ __u64 sec;
+ __u32 nsec;
+};
+
+struct btrfs_ioctl_received_subvol_args {
+ char uuid[BTRFS_UUID_SIZE]; /* in */
+ __u64 stransid; /* in */
+ __u64 rtransid; /* out */
+ struct btrfs_ioctl_timespec stime; /* in */
+ struct btrfs_ioctl_timespec rtime; /* out */
+ __u64 flags; /* in */
+ __u64 reserved[16]; /* in */
+};
+BUILD_ASSERT(sizeof(struct btrfs_ioctl_received_subvol_args) == 200);
+
+/*
+ * If we have a 32-bit userspace and 64-bit kernel, then the UAPI
+ * structures are incorrect, as the timespec structure from userspace
+ * is 4 bytes too small. We define these alternatives here for backward
+ * compatibility, the kernel understands both values.
+ */
+
+/*
+ * Structure size is different on 32bit and 64bit, has some padding if the
+ * structure is embedded. Packing makes sure the size is same on both, but will
+ * be misaligned on 64bit.
+ *
+ * NOTE: do not use in your code, this is for testing only
+ */
+struct btrfs_ioctl_timespec_32 {
+ __u64 sec;
+ __u32 nsec;
+} __attribute__ ((__packed__));
+
+struct btrfs_ioctl_received_subvol_args_32 {
+ char uuid[BTRFS_UUID_SIZE]; /* in */
+ __u64 stransid; /* in */
+ __u64 rtransid; /* out */
+ struct btrfs_ioctl_timespec_32 stime; /* in */
+ struct btrfs_ioctl_timespec_32 rtime; /* out */
+ __u64 flags; /* in */
+ __u64 reserved[16]; /* in */
+} __attribute__ ((__packed__));
+BUILD_ASSERT(sizeof(struct btrfs_ioctl_received_subvol_args_32) == 192);
+
+#define BTRFS_IOC_SET_RECEIVED_SUBVOL_32_COMPAT_DEFINED 1
+
+/*
+ * Caller doesn't want file data in the send stream, even if the
+ * search of clone sources doesn't find an extent. UPDATE_EXTENT
+ * commands will be sent instead of WRITE commands.
+ */
+#define BTRFS_SEND_FLAG_NO_FILE_DATA 0x1
+
+/*
+ * Do not add the leading stream header. Used when multiple snapshots
+ * are sent back to back.
+ */
+#define BTRFS_SEND_FLAG_OMIT_STREAM_HEADER 0x2
+
+/*
+ * Omit the command at the end of the stream that indicated the end
+ * of the stream. This option is used when multiple snapshots are
+ * sent back to back.
+ */
+#define BTRFS_SEND_FLAG_OMIT_END_CMD 0x4
+
+#define BTRFS_SEND_FLAG_MASK \
+ (BTRFS_SEND_FLAG_NO_FILE_DATA | \
+ BTRFS_SEND_FLAG_OMIT_STREAM_HEADER | \
+ BTRFS_SEND_FLAG_OMIT_END_CMD)
+
+struct btrfs_ioctl_send_args {
+ __s64 send_fd; /* in */
+ __u64 clone_sources_count; /* in */
+ __u64 __user *clone_sources; /* in */
+ __u64 parent_root; /* in */
+ __u64 flags; /* in */
+ __u64 reserved[4]; /* in */
+};
+/*
+ * 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
+ : (sizeof(void *) == 4
+ ? 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,
+ BTRFS_ERROR_DEV_RAID1_MIN_NOT_MET,
+ BTRFS_ERROR_DEV_RAID10_MIN_NOT_MET,
+ BTRFS_ERROR_DEV_RAID5_MIN_NOT_MET,
+ BTRFS_ERROR_DEV_RAID6_MIN_NOT_MET,
+ BTRFS_ERROR_DEV_TGT_REPLACE,
+ BTRFS_ERROR_DEV_MISSING_NOT_FOUND,
+ BTRFS_ERROR_DEV_ONLY_WRITABLE,
+ BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS
+};
+
+/* An error code to error string mapping for the kernel
+* error codes
+*/
+static inline char *btrfs_err_str(enum btrfs_err_code err_code)
+{
+ switch (err_code) {
+ case BTRFS_ERROR_DEV_RAID1_MIN_NOT_MET:
+ return "unable to go below two devices on raid1";
+ case BTRFS_ERROR_DEV_RAID10_MIN_NOT_MET:
+ return "unable to go below four devices on raid10";
+ case BTRFS_ERROR_DEV_RAID5_MIN_NOT_MET:
+ return "unable to go below two devices on raid5";
+ case BTRFS_ERROR_DEV_RAID6_MIN_NOT_MET:
+ return "unable to go below three devices on raid6";
+ case BTRFS_ERROR_DEV_TGT_REPLACE:
+ return "unable to remove the dev_replace target dev";
+ case BTRFS_ERROR_DEV_MISSING_NOT_FOUND:
+ return "no missing devices found to remove";
+ case BTRFS_ERROR_DEV_ONLY_WRITABLE:
+ return "unable to remove the only writeable device";
+ case BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS:
+ return "add/delete/balance/replace/resize operation "
+ "in progress";
+ default:
+ return NULL;
+ }
+}
+