From 3db11b2eecc02dc0eee943e71822c6d929281aa7 Mon Sep 17 00:00:00 2001
From: Zach Brown <zab@redhat.com>
Date: Tue, 10 Nov 2015 16:53:32 -0500
Subject: btrfs: add .copy_file_range file operation

This rearranges the existing COPY_RANGE ioctl implementation so that the
.copy_file_range file operation can call the core loop that copies file
data extent items.

The extent copying loop is lifted up into its own function.  It retains
the core btrfs error checks that should be shared.

Signed-off-by: Zach Brown <zab@redhat.com>
[Anna Schumaker: Make flags an unsigned int,
                 Check for COPY_FR_REFLINK]
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Reviewed-by: Josef Bacik <jbacik@fb.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---
 fs/btrfs/file.c | 1 +
 1 file changed, 1 insertion(+)

(limited to 'fs/btrfs/file.c')

diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c
index 72e73461c064..e67fe6ab8c9e 100644
--- a/fs/btrfs/file.c
+++ b/fs/btrfs/file.c
@@ -2924,6 +2924,7 @@ const struct file_operations btrfs_file_operations = {
 #ifdef CONFIG_COMPAT
 	.compat_ioctl	= btrfs_ioctl,
 #endif
+	.copy_file_range = btrfs_copy_file_range,
 };
 
 void btrfs_auto_defrag_exit(void)
-- 
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