nfsd and lockd use F_SETLK cmd with the FL_SLEEP flag set to request asynchronous processing of blocking locks. Currently nfs4 use locks_lock_inode_wait() function blocked on such requests. To handle such requests properly, non-blocking posix_file_lock() function should be used instead. https://bugzilla.kernel.org/show_bug.cgi?id=215383 Signed-off-by: Vasily Averin <vvs@xxxxxxxxxxxxx> --- VvS: I'm not sure that request->fl_file points to the same state->inode used in locks_lock_inode_wait(). If it is not, posix_lock_inode() can be used here, but this function is static currently and should be exported first. --- fs/nfs/nfs4proc.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c index ee3bc79f6ca3..54431b296c85 100644 --- a/fs/nfs/nfs4proc.c +++ b/fs/nfs/nfs4proc.c @@ -7200,8 +7200,11 @@ static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock int status; request->fl_flags |= FL_ACCESS; - status = locks_lock_inode_wait(state->inode, request); - if (status < 0) + if ((request->fl_flags && FL_SLEEP) && IS_SETLK(cmd)) + status = posix_lock_file(request->fl_file, request, NULL); + else + status = locks_lock_inode_wait(state->inode, request); + if (status) goto out; mutex_lock(&sp->so_delegreturn_mutex); down_read(&nfsi->rwsem); -- 2.25.1
