>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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