diff options
| -rw-r--r-- | tools/virtiofsd/passthrough_ll.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/tools/virtiofsd/passthrough_ll.c b/tools/virtiofsd/passthrough_ll.c index b3d0674f6d..3e56d1cd95 100644 --- a/tools/virtiofsd/passthrough_ll.c +++ b/tools/virtiofsd/passthrough_ll.c @@ -2467,6 +2467,15 @@ static void lo_flock(fuse_req_t req, fuse_ino_t ino, struct fuse_file_info *fi, int res; (void)ino; + if (!(op & LOCK_NB)) { + /* + * Blocking flock can deadlock as there is only one thread + * serving the queue. + */ + fuse_reply_err(req, EOPNOTSUPP); + return; + } + res = flock(lo_fi_fd(req, fi), op); fuse_reply_err(req, res == -1 ? errno : 0); |