Hi,
and also, I think, for PREALLOC extents, it is not enough just to skip
sending the data, but possibly need to perform preallocation on the
receive side, so a new SEND command might be needed.
Alex.
On Thu, Nov 29, 2012 at 10:55 AM, Alexander Block <ablock84@xxxxxxxxx> wrote:
> On Thu, Nov 29, 2012 at 7:06 AM, Chen Yang <chenyang.fnst@xxxxxxxxxxxxxx> wrote:
>> From 4222aa3a32cf4db161fcbbb87ad29b714f1bfaf2 Mon Sep 17 00:00:00 2001
>> From: Chen Yang <chenyang.fnst@xxxxxxxxxxxxxx>
>> 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.fnst@xxxxxxxxxxxxxx>
>> ---
>> 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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