[PATCH 121/145] man: document the reflink inode flag in fsxattr

[Darrick J. Wong]

Document the new inode flag in struct fsxattr for reflink.

Signed-off-by: Darrick J. Wong <darrick.wong at oracle.com>
---
 man/man3/xfsctl.3 |   10 ++++++++++
 1 file changed, 10 insertions(+)


diff --git a/man/man3/xfsctl.3 b/man/man3/xfsctl.3
index 9e7f138..ef6c992 100644
--- a/man/man3/xfsctl.3
+++ b/man/man3/xfsctl.3
@@ -230,6 +230,16 @@ If the filesystem lives on directly accessible persistent memory, reads and
 writes to this file will go straight to the persistent memory, bypassing the
 page cache.
 .TP
+.SM "Bit 16 (0x10000) \- XFS_XFLAG_REFLINK"
+This file is sharing or has shared blocks with another file.
+This flag can be set by reflinking or deduping blocks with another file
+and cleared by fallocating the entire file to pre-copy all shared extents.
+A file cannot have
+.BR XFS_XFLAG_REFLINK
+and
+.BR XFS_XFLAG_DAX
+set at the same time, that is to say that DAX files cannot share blocks.
+.TP
 .SM "Bit 31 (0x80000000) \- XFS_XFLAG_HASATTR"
 The file has extended attributes associated with it.
 .RE