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-rw-r--r--tools/virtiofsd/helper.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/tools/virtiofsd/helper.c b/tools/virtiofsd/helper.c
index 7bc5d7dc5a..85770d63f1 100644
--- a/tools/virtiofsd/helper.c
+++ b/tools/virtiofsd/helper.c
@@ -178,6 +178,10 @@ void fuse_cmdline_help(void)
" (0 leaves rlimit unchanged)\n"
" default: min(1000000, fs.file-max - 16384)\n"
" if the current rlimit is lower\n"
+ " -o allow_direct_io|no_allow_direct_io\n"
+ " retain/discard O_DIRECT flags passed down\n"
+ " to virtiofsd from guest applications.\n"
+ " default: no_allow_direct_io\n"
);
}