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gfs2: Fix glock rhashtable rcu bug

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commit 961ae1d83d055a4b9ebbfb4cc8ca62ec1a7a3b74 upstream.

Before commit 88ffbf3e03 "GFS2: Use resizable hash table for glocks",
glocks were freed via call_rcu to allow reading the glock hashtable
locklessly using rcu.  This was then changed to free glocks immediately,
which made reading the glock hashtable unsafe.  Bring back the original
code for freeing glocks via call_rcu.

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Andreas Gruenbacher 2017-07-07 13:22:05 -05:00 • committed by Greg Kroah-Hartman
parent ac12d6abed
commit e952c291df
2 changed files with 10 additions and 2 deletions
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11
fs/gfs2/glock.c
View file

@ -80,9 +80,9 @@ static struct rhashtable_params ht_parms = {
static struct rhashtable gl_hash_table;
void gfs2_glock_free(struct gfs2_glock *gl)
static void gfs2_glock_dealloc(struct rcu_head *rcu)
{
struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
struct gfs2_glock *gl = container_of(rcu, struct gfs2_glock, gl_rcu);
if (gl->gl_ops->go_flags & GLOF_ASPACE) {
kmem_cache_free(gfs2_glock_aspace_cachep, gl);
@ -90,6 +90,13 @@ void gfs2_glock_free(struct gfs2_glock *gl)
kfree(gl->gl_lksb.sb_lvbptr);
kmem_cache_free(gfs2_glock_cachep, gl);
}
}
void gfs2_glock_free(struct gfs2_glock *gl)
{
struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
call_rcu(&gl->gl_rcu, gfs2_glock_dealloc);
if (atomic_dec_and_test(&sdp->sd_glock_disposal))
wake_up(&sdp->sd_glock_wait);
}

1
fs/gfs2/incore.h
View file

@ -367,6 +367,7 @@ struct gfs2_glock {
loff_t end;
} gl_vm;
};
struct rcu_head gl_rcu;
struct rhash_head gl_node;
};