ioctl_ficlonerange.2: mention a subtlety with length == 0

I forgot to document that passing length == 0 to clonerange actually
makes it clone all the way to EOF, so do that now.

Signed-off-by: Darrick J. Wong <redacted>
---
 man2/ioctl_ficlonerange.2 |    3 +++
 1 file changed, 3 insertions(+)

diff --git a/man2/ioctl_ficlonerange.2 b/man2/ioctl_ficlonerange.2
index d1da3e6..c4715d0 100644
--- a/man2/ioctl_ficlonerange.2
+++ b/man2/ioctl_ficlonerange.2

@@ -59,6 +59,9 @@ into the file
 at offset
 .IR dest_offset ",
 provided that both are files.
+If
+.IR src_length
+is zero, the ioctl reflinks to the end of the source file.
 This information is conveyed in a structure of
 the following form:
 .in +4n

On 07/14/2016 08:11 PM, Darrick J. Wong wrote:

I forgot to document that passing length == 0 to clonerange actually
makes it clone all the way to EOF, so do that now.

Thanks, Darrick. Applied.

Cheers,

Michael

-- 
Michael Kerrisk
Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/
Linux/UNIX System Programming Training: http://man7.org/training/
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