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gfs2: fix glock shrinker ref issues

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[ Upstream commit 62862485a4c3a52029fc30f4bdde9af04afdafc9 ]

Before this patch, function gfs2_scan_glock_lru would only try to free
glocks that had a reference count of 0. But if the reference count ever
got to 0, the glock should have already been freed.

Shrinker function gfs2_dispose_glock_lru checks whether glocks on the
LRU are demote_ok, and if so, tries to demote them. But that's only
possible if the reference count is at least 1.

This patch changes gfs2_scan_glock_lru so it will try to demote and/or
dispose of glocks that have a reference count of 1 and which are either
demotable, or are already unlocked.

Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Bob Peterson 2023-09-12 08:05:51 -05:00 committed by Greg Kroah-Hartman
parent f057b2c710
commit 73ab623014
1 changed files with 3 additions and 1 deletions
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4
fs/gfs2/glock.c
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@ -2017,7 +2017,9 @@ static long gfs2_scan_glock_lru(int nr)
if (!test_bit(GLF_LOCK, &gl->gl_flags)) {
if (!spin_trylock(&gl->gl_lockref.lock))
continue;
if (!gl->gl_lockref.count) {
if (gl->gl_lockref.count <= 1 &&
(gl->gl_state == LM_ST_UNLOCKED ||
demote_ok(gl))) {
list_move(&gl->gl_lru, &dispose);
atomic_dec(&lru_count);
freed++;