The flag and command are synced from kernel to user. Also, this patch adds a callback for the BTRFS_SEND_C_UPDATE_EXTENT in struct btrfs_send_ops. read_and_process_cmd() is updated to decode BTRFS_SEND_C_UPDATE_EXTENT and send the values through the right callback. I did not add a callback definition to cmds-receive.c as that code never uses BTRFS_SEND_FLAG_NO_FILE_DATA.
Signed-off-by: Mark Fasheh <mfas...@suse.de> --- ioctl.h | 7 +++++++ send-stream.c | 6 ++++++ send-stream.h | 1 + send.h | 1 + 4 files changed, 15 insertions(+) diff --git a/ioctl.h b/ioctl.h index 6fda3a1..b7f1ce3 100644 --- a/ioctl.h +++ b/ioctl.h @@ -321,6 +321,13 @@ struct btrfs_ioctl_received_subvol_args { __u64 reserved[16]; /* in */ }; +/* + * 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 + struct btrfs_ioctl_send_args { __s64 send_fd; /* in */ __u64 clone_sources_count; /* in */ diff --git a/send-stream.c b/send-stream.c index 55fa728..a3628e4 100644 --- a/send-stream.c +++ b/send-stream.c @@ -418,6 +418,12 @@ static int read_and_process_cmd(struct btrfs_send_stream *s) TLV_GET_TIMESPEC(s, BTRFS_SEND_A_CTIME, &ct); ret = s->ops->utimes(path, &at, &mt, &ct, s->user); break; + case BTRFS_SEND_C_UPDATE_EXTENT: + TLV_GET_STRING(s, BTRFS_SEND_A_PATH, &path); + TLV_GET_U64(s, BTRFS_SEND_A_FILE_OFFSET, &offset); + TLV_GET_U64(s, BTRFS_SEND_A_SIZE, &tmp); + ret = s->ops->update_extent(path, offset, tmp, s->user); + break; case BTRFS_SEND_C_END: ret = 1; break; diff --git a/send-stream.h b/send-stream.h index b69b7f1..9a17e32 100644 --- a/send-stream.h +++ b/send-stream.h @@ -49,6 +49,7 @@ struct btrfs_send_ops { int (*utimes)(const char *path, struct timespec *at, struct timespec *mt, struct timespec *ct, void *user); + int (*update_extent)(const char *path, u64 offset, u64 len, void *user); }; int btrfs_read_and_process_send_stream(int fd, diff --git a/send.h b/send.h index 9934e94..48d425a 100644 --- a/send.h +++ b/send.h @@ -86,6 +86,7 @@ enum btrfs_send_cmd { BTRFS_SEND_C_UTIMES, BTRFS_SEND_C_END, + BTRFS_SEND_C_UPDATE_EXTENT, __BTRFS_SEND_C_MAX, }; #define BTRFS_SEND_C_MAX (__BTRFS_SEND_C_MAX - 1) -- 1.7.10.4 -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html