diff options
Diffstat (limited to 'ioctl.h')
| -rw-r--r-- | ioctl.h | 31 |
1 files changed, 29 insertions, 2 deletions
@@ -635,8 +635,8 @@ 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 +644,28 @@ 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 +783,11 @@ 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) |