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gfs2: Add missing rcu locking for glock lookup

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am: 70a09029b7

Change-Id: I936502d0217b7206108e4ff5eb087ff22044da40
This commit is contained in:
Andrew Price
2017-03-12 08:23:00 +00:00
committed by android-build-merger
parent dbfdd61d3a 70a09029b7
commit 057f4303d1
1 changed files with 5 additions and 0 deletions
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5
fs/gfs2/glock.c
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@@ -651,9 +651,11 @@ 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)
@@ -721,15 +723,18 @@ 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);
}