From: Murphy Zhou jencce.kernel@gmail.com
commit 979a2665eb6c603ddce0ab374041ab101827b2e7 upstream.
If we call fiemap on a truncated file with none blocks allocated, it makes sense we get nothing from this call. No output means no blocks have been counted, but the call succeeded. It's a valid response.
Simple example reproducer: xfs_io -f 'truncate 2M' -c 'fiemap -v' /cifssch/testfile xfs_io: ioctl(FS_IOC_FIEMAP) ["/cifssch/testfile"]: Invalid argument
Signed-off-by: Murphy Zhou jencce.kernel@gmail.com Signed-off-by: Steve French stfrench@microsoft.com Reviewed-by: Pavel Shilovsky pshilov@microsoft.com CC: Stable stable@vger.kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- fs/cifs/smb2ops.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/fs/cifs/smb2ops.c +++ b/fs/cifs/smb2ops.c @@ -3252,7 +3252,7 @@ static int smb3_fiemap(struct cifs_tcon if (rc) goto out;
- if (out_data_len < sizeof(struct file_allocated_range_buffer)) { + if (out_data_len && out_data_len < sizeof(struct file_allocated_range_buffer)) { rc = -EINVAL; goto out; }