[PATCH block/for-3.4/core] cfq: fix cfqg ref handling when BLK_CGROUP && !CFQ_GROUP_IOSCHED

Tejun Heo
2012-03-15T16:35:52Z

When BLK_CGROUP is enabled but CFQ_GROUP_IOSCHED is, cfq ends up
calling blkg_get/put() on dummy cfqg leading to the following crash.

BUG: unable to handle kernel NULL pointer dereference at 00000000000000b0
IP: [<ffffffff813d44d8>] cfq_init_queue+0x258/0x430
PGD 0
Oops: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC
CPU 0
Modules linked in:

Pid: 1, comm: swapper/0 Not tainted 3.3.0-rc6-work+ #125 Bochs Bochs
RIP: 0010:[<ffffffff813d44d8>] [<ffffffff813d44d8>] cfq_init_queue+0x258/0x430
RSP: 0018:ffff88001f9dfd80 EFLAGS: 00010046
RAX: ffff88001aefbbf0 RBX: ffff88001aeedbf0 RCX: 0000000000000100
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff820ffd40
RBP: ffff88001f9dfdd0 R08: 0000000000000000 R09: 0000000000000001
R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000009 R14: ffff88001aefbc30 R15: 0000000000000003
FS: 0000000000000000(0000) GS:ffff88001fc00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
CR2: 00000000000000b0 CR3: 000000000206f000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Process swapper/0 (pid: 1, threadinfo ffff88001f9de000, task ffff88001f9dc040)
Stack:
ffff88001aeedbf0 ffff88001aefbdb0 ffff88001aef1548 ffff88001aefbbf0
ffff88001f9dfdd0 ffff88001aef1548 ffffffff820d6320 ffffffff8165ce30
ffffffff82c555e0 ffff88001aeebbf0 ffff88001f9dfe00 ffffffff813b0507
Call Trace:
[<ffffffff813b0507>] elevator_init+0xd7/0x140
[<ffffffff813b83d5>] blk_init_allocated_queue+0x125/0x150
[<ffffffff813b94d3>] blk_init_queue_node+0x43/0x80
[<ffffffff813b9523>] blk_init_queue+0x13/0x20
[<ffffffff821aec00>] floppy_init+0x82/0xec7
[<ffffffff810001d2>] do_one_initcall+0x42/0x170
[<ffffffff821835fc>] kernel_init+0xcb/0x14f
[<ffffffff81b40b24>] kernel_thread_helper+0x4/0x10
Code: 00 e8 1d 9e 76 00 48 8b 43 48 48 85 c0 48 89 83 28 03 00 00 74 07 4c 8b a0 10 ff ff ff 8b 15 b0 2e d0 00 85 d2 0f 85 49 01 00 00 <41> 8b 84 24 b0 00 00 00 85 c0 0f 8e 8c 01 00 00 83 e8 01 85 c0
RIP [<ffffffff813d44d8>] cfq_init_queue+0x258/0x430

Because cfq's blkcg support has a on/off switch, CFQ_GROUP_IOSCHED,
separate from BLK_CGROUP, blkg access through cfqg needs to be
conditioned on it.

* Make blkg_to_cfqg() and cfqg_to_blkg() conditioned on
CFQ_GROUP_IOSCHED. If disabled, they always return %NULL.

* Introduce cfqg_get() and cfqg_put() conditioned on
CFQ_GROUP_IOSCHED. If disabled, they are noops.

Reported-by: Fengguang Wu <fengguang.wu@intel.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
---
Yeap, forgot to test that config combination. Fengguang, can you
please test this patch? Jens, once Fengguang confirms the fix, can
you please apply this on top of for-3.4/core along with the pending
stats updates?

Thanks.

block/cfq-iosched.c | 52 +++++++++++++++++++++++++++++++++++-----------------
1 file changed, 35 insertions(+), 17 deletions(-)

Index: work/block/cfq-iosched.c
===================================================================
--- work.orig/block/cfq-iosched.c
+++ work/block/cfq-iosched.c
@@ -302,16 +302,6 @@ struct cfq_data {
unsigned long last_delayed_sync;
};

-static inline struct cfq_group *blkg_to_cfqg(struct blkio_group *blkg)
-{
- return blkg_to_pdata(blkg, &blkio_policy_cfq);
-}
-
-static inline struct blkio_group *cfqg_to_blkg(struct cfq_group *cfqg)
-{
- return pdata_to_blkg(cfqg, &blkio_policy_cfq);
-}
-
static struct cfq_group *cfq_get_next_cfqg(struct cfq_data *cfqd);

static struct cfq_rb_root *service_tree_for(struct cfq_group *cfqg,
@@ -373,6 +363,26 @@ CFQ_CFQQ_FNS(wait_busy);
#undef CFQ_CFQQ_FNS

#ifdef CONFIG_CFQ_GROUP_IOSCHED
+static inline struct cfq_group *blkg_to_cfqg(struct blkio_group *blkg)
+{
+ return blkg_to_pdata(blkg, &blkio_policy_cfq);
+}
+
+static inline struct blkio_group *cfqg_to_blkg(struct cfq_group *cfqg)
+{
+ return pdata_to_blkg(cfqg, &blkio_policy_cfq);
+}
+
+static inline void cfqg_get(struct cfq_group *cfqg)
+{
+ return blkg_get(cfqg_to_blkg(cfqg));
+}
+
+static inline void cfqg_put(struct cfq_group *cfqg)
+{
+ return blkg_put(cfqg_to_blkg(cfqg));
+}
+
#define cfq_log_cfqq(cfqd, cfqq, fmt, args...) \
blk_add_trace_msg((cfqd)->queue, "cfq%d%c %s " fmt, (cfqq)->pid, \
cfq_cfqq_sync((cfqq)) ? 'S' : 'A', \
@@ -382,11 +392,19 @@ CFQ_CFQQ_FNS(wait_busy);
blk_add_trace_msg((cfqd)->queue, "%s " fmt, \
blkg_path(cfqg_to_blkg((cfqg))), ##args) \

-#else
+#else /* CONFIG_CFQ_GROUP_IOSCHED */
+
+static inline struct cfq_group *blkg_to_cfqg(struct blkio_group *blkg) { return NULL; }
+static inline struct blkio_group *cfqg_to_blkg(struct cfq_group *cfqg) { return NULL; }
+static inline void cfqg_get(struct cfq_group *cfqg) { }
+static inline void cfqg_put(struct cfq_group *cfqg) { }
+
#define cfq_log_cfqq(cfqd, cfqq, fmt, args...) \
blk_add_trace_msg((cfqd)->queue, "cfq%d " fmt, (cfqq)->pid, ##args)
#define cfq_log_cfqg(cfqd, cfqg, fmt, args...) do {} while (0)
-#endif
+
+#endif /* CONFIG_CFQ_GROUP_IOSCHED */
+
#define cfq_log(cfqd, fmt, args...) \
blk_add_trace_msg((cfqd)->queue, "cfq " fmt, ##args)

@@ -1086,7 +1104,7 @@ static void cfq_link_cfqq_cfqg(struct cf

cfqq->cfqg = cfqg;
/* cfqq reference on cfqg */
- blkg_get(cfqg_to_blkg(cfqg));
+ cfqg_get(cfqg);
}

#else /* GROUP_IOSCHED */
@@ -2501,7 +2519,7 @@ static void cfq_put_queue(struct cfq_que

BUG_ON(cfq_cfqq_on_rr(cfqq));
kmem_cache_free(cfq_pool, cfqq);
- blkg_put(cfqg_to_blkg(cfqg));
+ cfqg_put(cfqg);
}

static void cfq_put_cooperator(struct cfq_queue *cfqq)
@@ -3256,7 +3274,7 @@ static void cfq_put_request(struct reque
cfqq->allocated[rw]--;

/* Put down rq reference on cfqg */
- blkg_put(cfqg_to_blkg(RQ_CFQG(rq)));
+ cfqg_put(RQ_CFQG(rq));
rq->elv.priv[0] = NULL;
rq->elv.priv[1] = NULL;

@@ -3352,7 +3370,7 @@ new_queue:
cfqq->allocated[rw]++;

cfqq->ref++;
- blkg_get(cfqg_to_blkg(cfqq->cfqg));
+ cfqg_get(cfqq->cfqg);
rq->elv.priv[0] = cfqq;
rq->elv.priv[1] = cfqq->cfqg;
spin_unlock_irq(q->queue_lock);
@@ -3533,7 +3551,7 @@ static int cfq_init_queue(struct request

spin_lock_irq(q->queue_lock);
cfq_link_cfqq_cfqg(&cfqd->oom_cfqq, cfqd->root_group);
- blkg_put(cfqg_to_blkg(cfqd->root_group));
+ cfqg_put(cfqd->root_group);
spin_unlock_irq(q->queue_lock);

init_timer(&cfqd->idle_slice_timer);