[PATCH] xfs_io: clarify -c from documentation

["Darrick J. Wong" <darrick.wong@oracle.com>]

From: Darrick J. Wong <darrick.wong@oracle.com>

The -c parameter displays the cow fork information for a file if the
kernel was built with CONFIG_XFS_DEBUG=y.  Since xfs_bmap doesn't
support it and it doesn't work generally, remove it from the manpages.
However, xfstests relies on the -c command to be documented in the help
screen so leave it there with a warning about its use.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
---
 io/bmap.c         |    1 +
 man/man8/xfs_io.8 |    2 +-
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/io/bmap.c b/io/bmap.c
index 2e4ff7b2..345f276e 100644
--- a/io/bmap.c
+++ b/io/bmap.c
@@ -43,6 +43,7 @@ bmap_help(void)
 " All the file offsets and disk blocks are in units of 512-byte blocks.\n"
 " -a -- prints the attribute fork map instead of the data fork.\n"
 " -c -- prints the copy-on-write fork map instead of the data fork.\n"
+"       This works only if the kernel was compiled in debug mode.\n"
 " -d -- suppresses a DMAPI read event, offline portions shown as holes.\n"
 " -e -- print delayed allocation extents.\n"
 " -l -- also displays the length of each extent in 512-byte blocks.\n"
diff --git a/man/man8/xfs_io.8 b/man/man8/xfs_io.8
index 2bd77ee8..eb2b862e 100644
--- a/man/man8/xfs_io.8
+++ b/man/man8/xfs_io.8
@@ -315,7 +315,7 @@ See the
 .B pwrite
 command.
 .TP
-.BI "bmap [ \-acdelpv ] [ \-n " nx " ]"
+.BI "bmap [ \-adelpv ] [ \-n " nx " ]"
 Prints the block mapping for the current open file. Refer to the
 .BR xfs_bmap (8)
 manual page for complete documentation.