On Wed, Apr 16, 2014 at 03:56:15PM +0100, Filipe David Borba Manana wrote:
> V2: Added new send ioctl flag BTRFS_SEND_FLAG_SUPPORT_FALLOCATE. A version 2
>     stream is now only produced is the ioctl caller specifies at least one of
>     the new send flags (BTRFS_SEND_FLAG_SUPPORT_FALLOCATE or
>     BTRFS_SEND_FLAG_CALCULATE_DATA_SIZE).

Good.

> @@ -156,6 +165,12 @@ static int process_subvol(const char *path, const u8 
> *uuid, u64 ctransid,
>               goto out;
>  
>       r->cur_subvol = calloc(1, sizeof(*r->cur_subvol));
> +     r->total_data_size = 0;
> +     r->bytes_received = 0;
> +     r->progress = 0.0;
> +     r->last_progress_update = 0;
> +     r->bytes_received_last_update = 0;
> +     r->target = "Subvolume";
>  
>       if (strlen(r->dest_dir_path) == 0)
>               r->cur_subvol->path = strdup(path);
> @@ -205,6 +220,12 @@ static int process_snapshot(const char *path, const u8 
> *uuid, u64 ctransid,
>               goto out;
>  
>       r->cur_subvol = calloc(1, sizeof(*r->cur_subvol));
> +     r->total_data_size = 0;
> +     r->bytes_received = 0;
> +     r->progress = 0.0;
> +     r->last_progress_update = 0;
> +     r->bytes_received_last_update = 0;
> +     r->target = "Snapshot";

Nontrivial amount of duplicate code, a helper would be better.

> @@ -673,7 +679,7 @@ out:
>  }
>  
>  const char * const cmd_send_usage[] = {
> -     "btrfs send [-ve] [-p <parent>] [-c <clone-src>] [-f <outfile>] 
> <subvol> [<subvol>...]",
> +     "btrfs send [-veo] [-p <parent>] [-c <clone-src>] [-f <outfile>] 
> <subvol> [<subvol>...]",
>       "Send the subvolume(s) to stdout.",
>       "Sends the subvolume(s) specified by <subvol> to stdout.",
>       "By default, this will send the whole subvolume. To do an incremental",
> @@ -697,5 +703,9 @@ const char * const cmd_send_usage[] = {
>       "-f <outfile>     Output is normally written to stdout. To write to",
>       "                 a file, use this option. An alternative would be to",
>       "                 use pipes.",
> +     "-o               Obtain the total data size for each subvolume or ",

UI:

-o is sometimes used as an option for 'output', which makes sense in
context of send, but is already done via -f. I'm not sure if it's a good
choice. 'p' is already occupied.

As an alternative: how about -s ? mnemonic for 'size'.

> +     "                 snapshot to send. This demands additional processing",
> +     "                 (mostly IO bound) but is useful for the receive ",
> +     "                 command to report progress.",
>       NULL
>  };
--
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