btrace: Add in -r support for btrace

Using Ubuntu, debugfs is mounted on /debug instead of /sys/kernel/debug.
[Perhaps, we should put in blktrace a search through "common" areas
where debug could be mounted, and or do a simple parsing of the output
from a 'mount' command to /find/ the directory.]

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

diff --git a/btrace b/btrace
old mode 100755 (executable)
new mode 100644 (file)
index 86493c5..f902707
--- a/btrace
+++ b/btrace
@@ -9,16 +9,17 @@
 TRACEOPTS=""
 PARSEOPTS="-b100000"
 SUMMARIZE=""
-USAGE="Usage: btrace [-s] [-t] [-S] [-w N] [-a <trace>...] <dev>..."
+USAGE="Usage: btrace [-s] [-t] [-S] [-w N] [-a <trace>...] [-r <dbg mnt]<dev>..."
 DIRNAME=`dirname $0`
 
-while getopts "a:stSw:hv" c
+while getopts "a:r:stSw:hv" c
 do
        case $c in
        a)      TRACEOPTS=$TRACEOPTS" -a "$OPTARG" ";;
        w)      TRACEOPTS=$TRACEOPTS" -w "$OPTARG" ";;
        n)      TRACEOPTS=$TRACEOPTS" -n "$OPTARG" ";;
        b)      TRACEOPTS=$TRACEOPTS" -b "$OPTARG" ";;
+       r)      TRACEOPTS=$TRACEOPTS" -r "$OPTARG" ";;
        s)      PARSEOPTS=$PARSEOPTS" -s";;
        t)      PARSEOPTS=$PARSEOPTS" -t";;
        h)      PARSEOPTS=$PARSEOPTS" -h";;