On Thu, Nov 29, 2012 at 7:06 AM, Chen Yang <chenyang.f...@cn.fujitsu.com> wrote:
> From 4222aa3a32cf4db161fcbbb87ad29b714f1bfaf2 Mon Sep 17 00:00:00 2001
> From: Chen Yang <chenyang.f...@cn.fujitsu.com>
> Date: Thu, 29 Nov 2012 13:22:09 +0800
> Subject: [PATCH] Btrfs: send - pre-allocated file support for btrfs-send
> mechanism
>
> when send or receive a file which has pre-allocated part,
> the pre-allocated parts of the file will be sent as ZERO streams,
> and it's unnecessary.
>
> So we can improve this by skip these EMPTY parts.
>
> Signed-off-by: Cheng Yang <chenyang.f...@cn.fujitsu.com>
> ---
> this patch is based on
> "Btrfs: send - sparse file support for btrfs-send mechanism"
> ---
> fs/btrfs/send.c | 7 ++++++-
> 1 files changed, 6 insertions(+), 1 deletions(-)
>
> diff --git a/fs/btrfs/send.c b/fs/btrfs/send.c
> index 1e1d59a..2d23184 100644
> --- a/fs/btrfs/send.c
> +++ b/fs/btrfs/send.c
> @@ -3732,13 +3732,18 @@ static int send_write_or_clone(struct send_ctx *sctx,
> * sure to send the whole thing
> */
> len = PAGE_CACHE_ALIGN(len);
> - } else {
> + } else if (type == BTRFS_FILE_EXTENT_REG) {
> bytenr = btrfs_file_extent_disk_bytenr(path->nodes[0], ei);
> if (bytenr == 0) {
> ret = 0;
> goto out;
> }
> len = btrfs_file_extent_num_bytes(path->nodes[0], ei);
> + } else if (type == BTRFS_FILE_EXTENT_PREALLOC) {
> + ret = 0;
> + goto out;
> + } else {
> + BUG();
> }
>
> if (offset + len > sctx->cur_inode_size)
> --
> 1.7.7.6
>
> --
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The same as in my previous mail applies here.
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