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ext4: Use rcu_barrier() on module unload.

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The ext4 module uses rcu_call() thus it should use rcu_barrier()on
module unload.

The kmem cache ext4_pspace_cachep is sometimes free'ed using
call_rcu() callbacks.  Thus, we must wait for completion of call_rcu()
before doing kmem_cache_destroy().

Signed-off-by: Jesper Dangaard Brouer <hawk@comx.dk>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
This commit is contained in:
Jesper Dangaard Brouer 2009-07-05 22:29:27 -04:00 committed by Theodore Ts'o
parent 726447d803
commit 3e03f9ca6a
1 changed files with 5 additions and 1 deletions
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6
fs/ext4/mballoc.c
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@ -2909,7 +2909,11 @@ int __init init_ext4_mballoc(void)
void exit_ext4_mballoc(void)
{
/* XXX: synchronize_rcu(); */
/*
* Wait for completion of call_rcu()'s on ext4_pspace_cachep
* before destroying the slab cache.
*/
rcu_barrier();
kmem_cache_destroy(ext4_pspace_cachep);
kmem_cache_destroy(ext4_ac_cachep);
kmem_cache_destroy(ext4_free_ext_cachep);