From e11b02df60bdf2ac6bb8eaed525db4f02415a902 Mon Sep 17 00:00:00 2001 From: Andreas Gruenbacher Date: Mon, 22 Nov 2021 17:32:35 +0100 Subject: [PATCH] gfs2: Fix remote demote of weak glock holders When we mock up a temporary holder in gfs2_glock_cb to demote weak holders in response to a remote locking conflict, we don't set the HIF_HOLDER flag. This causes function may_grant to BUG. Fix by setting the missing HIF_HOLDER flag in the mock glock holder. In addition, define the mock glock holder where it is used. Signed-off-by: Andreas Gruenbacher --- fs/gfs2/glock.c | 10 +++++++--- 1 file changed, 7 insertions(+), 3 deletions(-) diff --git a/fs/gfs2/glock.c b/fs/gfs2/glock.c index 8dbd6fe66420..44a7a4288956 100644 --- a/fs/gfs2/glock.c +++ b/fs/gfs2/glock.c @@ -1857,7 +1857,6 @@ void gfs2_glock_dq_m(unsigned int num_gh, struct gfs2_holder *ghs) void gfs2_glock_cb(struct gfs2_glock *gl, unsigned int state) { - struct gfs2_holder mock_gh = { .gh_gl = gl, .gh_state = state, }; unsigned long delay = 0; unsigned long holdtime; unsigned long now = jiffies; @@ -1890,8 +1889,13 @@ void gfs2_glock_cb(struct gfs2_glock *gl, unsigned int state) * keep the glock until the last strong holder is done with it. */ if (!find_first_strong_holder(gl)) { - if (state == LM_ST_UNLOCKED) - mock_gh.gh_state = LM_ST_EXCLUSIVE; + struct gfs2_holder mock_gh = { + .gh_gl = gl, + .gh_state = (state == LM_ST_UNLOCKED) ? + LM_ST_EXCLUSIVE : state, + .gh_iflags = BIT(HIF_HOLDER) + }; + demote_incompat_holders(gl, &mock_gh); } handle_callback(gl, state, delay, true);