# touch /mnt/dst
# clone_range -d 4096 /mnt/src /mnt/dst
# umount /mnt
# btrfs-debug-tree /dev/sda7
...
item 10 key (258 INODE_REF 256) itemoff 3283 itemsize 13
inode ref index 3 namelen 3 name: tmp
item 11 key (258 EXTENT_DATA 4096) itemoff 3230 itemsize 53
extent data disk byte 12632064 nr 49152
extent data offset 0 nr 49152 ram 49152
extent compression 0
You can see there's no file extent with range [0, 4096]. Check this by
btrfsck:
# btrfsck /dev/sda7
root 5 inode 258 errors 100
...
Signed-off-by: Li Zefan <lizf@xxxxxxxxxxxxxx>
---
fs/btrfs/ioctl.c | 6 ++++++
1 files changed, 6 insertions(+), 0 deletions(-)
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index 970977a..660a6c8 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -2220,6 +2220,12 @@ static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd,
!IS_ALIGNED(destoff, bs))
goto out_unlock;
+ if (destoff > inode->i_size) {
+ ret = btrfs_cont_expand(inode, inode->i_size, destoff);
+ if (ret)
+ goto out_unlock;
+ }
+
/* do any pending delalloc/csum calc on src, one way or
another, and lock file content */
while (1) {
--
1.7.3.1
--
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