test/rbd: document fsx option to keep data on success

Add documentation line for the -k option to fsx to retain data
on success.

Signed-off-by: Douglas Fuller <dfuller@redhat.com>

diff --git a/src/test/librbd/fsx.cc b/src/test/librbd/fsx.cc
index f17c4a727ed2abb604d1ccb6d7ea13a4003a8cee..daee85e22055c5a0f6945d87d48dfade817406b7 100644 (file)
--- a/src/test/librbd/fsx.cc
+++ b/src/test/librbd/fsx.cc
@@ -2195,13 +2195,14 @@ void
 usage(void)
 {
        fprintf(stdout, "usage: %s",
-               "fsx [-dfjnqxyACFHKLORUWZ] [-b opnum] [-c Prob] [-h holebdy] [-l flen] [-m start:end] [-o oplen] [-p progressinterval] [-r readbdy] [-s style] [-t truncbdy] [-w writebdy] [-D startingop] [-N numops] [-P dirpath] [-S seed] pname iname\n\
+               "fsx [-dfjknqxyACFHKLORUWZ] [-b opnum] [-c Prob] [-h holebdy] [-l flen] [-m start:end] [-o oplen] [-p progressinterval] [-r readbdy] [-s style] [-t truncbdy] [-w writebdy] [-D startingop] [-N numops] [-P dirpath] [-S seed] pname iname\n\
        -b opnum: beginning operation number (default 1)\n\
        -c P: 1 in P chance of file close+open at each op (default infinity)\n\
        -d: debug output for all operations\n\
        -f: flush and invalidate cache after I/O\n\
        -h holebdy: 4096 would make discards page aligned (default 1)\n\
        -j: journal replay stress test\n\
+       -k: keep data on success (default 0)\n\
        -l flen: the upper bound on file size (default 262144)\n\
        -m startop:endop: monitor (print debug output) specified byte range (default 0:infinity)\n\
        -n: no verifications of file size\n\