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[57/71] man: document the reflink inode flag in fsxattr

Message ID 147216916395.4420.14137061415373193422.stgit@birch.djwong.org
State Not Applicable
Headers show

Commit Message

Darrick J. Wong Aug. 25, 2016, 11:52 p.m. UTC
Document the new inode flag in struct fsxattr for reflink.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
 man/man3/xfsctl.3 |   10 ++++++++++
 1 file changed, 10 insertions(+)
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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.
+.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
+set at the same time, that is to say that DAX files cannot share blocks.
 .SM "Bit 31 (0x80000000) \- XFS_XFLAG_HASATTR"
 The file has extended attributes associated with it.