kernel export thread (nfsd/lockd/ksmbd) use F_SETLK cmd with set FL_SLEEP flag to request asynchronous processing of blocking locks. Fuse does not support async processing and should drop FL_SLEEP flag to avoid execution of blocking FUSE_SETLKW request. Dropped FL_SLEEP flag should be restored back, because it can be used in caller, at least in nfsd4_lock() does it actually. https://bugzilla.kernel.org/show_bug.cgi?id=215383 Signed-off-by: Vasily Averin <vvs@xxxxxxxxxxxxx> --- fs/fuse/file.c | 11 ++++++++++- 1 file changed, 10 insertions(+), 1 deletion(-) diff --git a/fs/fuse/file.c b/fs/fuse/file.c index 06e0d7fa86f3..54a9a5d660a6 100644 --- a/fs/fuse/file.c +++ b/fs/fuse/file.c @@ -2540,8 +2540,17 @@ static int fuse_file_lock(struct file *file, int cmd, struct file_lock *fl) } else { if (fc->no_lock) err = posix_lock_file(file, fl, NULL); - else + else { + bool async = (fl->fl_flags & FL_SLEEP) && IS_SETLK(cmd); + + if (async) + fl->fl_flags &= ~FL_SLEEP; + err = fuse_setlk(file, fl, 0); + + if (async) + fl->fl_flags |= FL_SLEEP; + } } return err; } -- 2.25.1
