Btrfs: Add fallocate support v2

This patch updates btrfs-progs for fallocate support.

fallocate is a little different in Btrfs because we need to tell the
COW system that a given preallocated extent doesn't need to be
cow'd as long as there are no snapshots of it.  This leverages the
-o nodatacow checks.
 
Signed-off-by: Yan Zheng <zheng.yan@oracle.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index 7f915d478399..9ff2b4e0e922 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -724,7 +724,8 @@ long btrfs_ioctl_clone(struct file *file, unsigned long src_fd)
                         extent = btrfs_item_ptr(leaf, slot,
                                                 struct btrfs_file_extent_item);
                         found_type = btrfs_file_extent_type(leaf, extent);
-                        if (found_type == BTRFS_FILE_EXTENT_REG) {
+                        if (found_type == BTRFS_FILE_EXTENT_REG ||
+                            found_type == BTRFS_FILE_EXTENT_PREALLOC) {
                                 u64 ds = btrfs_file_extent_disk_bytenr(leaf,
                                                                        extent);
                                 u64 dl = btrfs_file_extent_disk_num_bytes(leaf,