xfs_io: document fzero_f -k option in manpage

Perhaps the reason -k was broken is that nobody knew it existed?

Fixes: 938904c4 ("xfs_io: add fzero command for zeroing range via fallocate")
Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Eric Sandeen <sandeen@sandeen.net>

diff --git a/man/man8/xfs_io.8 b/man/man8/xfs_io.8
index fbf50df578097fad872def1e079454c4c7bb8dea..980dcfd35ea45f2f57afbceab4bf6a2c53b67b1f 100644 (file)
--- a/man/man8/xfs_io.8
+++ b/man/man8/xfs_io.8
@@ -516,10 +516,13 @@ Call fallocate with FALLOC_FL_UNSHARE_RANGE flag as described in the
 .BR fallocate (2)
 manual page to unshare all shared blocks within the range.
 .TP
-.BI fzero " offset length"
+.BI "fzero [ \-k ]" " offset length"
 Call fallocate with FALLOC_FL_ZERO_RANGE flag as described in the
 .BR fallocate (2)
 manual page to allocate and zero blocks within the range.
+With the
+.B -k
+option, use the FALLOC_FL_KEEP_SIZE flag as well.
 .TP
 .BI zero " offset length"
 Call xfsctl with