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gfs2: Add missing rcu locking for glock lookup

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am: 4cf918c804

Change-Id: I9848a18606bc0200c0bc72c7e6fc80c4495c1132
This commit is contained in:
Andrew Price
2017-03-12 08:29:18 +00:00
committed by android-build-merger
parent fa7886f10d 4cf918c804
commit 0af27202eb
1 changed files with 5 additions and 0 deletions
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5
fs/gfs2/glock.c
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@@ -658,9 +658,11 @@ int gfs2_glock_get(struct gfs2_sbd *sdp, u64 number,
struct kmem_cache *cachep;
int ret, tries = 0;
rcu_read_lock();
gl = rhashtable_lookup_fast(&gl_hash_table, &name, ht_parms);
if (gl && !lockref_get_not_dead(&gl->gl_lockref))
gl = NULL;
rcu_read_unlock();
*glp = gl;
if (gl)
@@ -728,15 +730,18 @@ again:
if (ret == -EEXIST) {
ret = 0;
rcu_read_lock();
tmp = rhashtable_lookup_fast(&gl_hash_table, &name, ht_parms);
if (tmp == NULL || !lockref_get_not_dead(&tmp->gl_lockref)) {
if (++tries < 100) {
rcu_read_unlock();
cond_resched();
goto again;
}
tmp = NULL;
ret = -ENOMEM;
}
rcu_read_unlock();
} else {
WARN_ON_ONCE(ret);
}