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authorKent Overstreet <kmo@daterainc.com>2013-10-10 19:31:47 -0700
committerKent Overstreet <kmo@daterainc.com>2013-10-10 19:31:47 -0700
commite34ecee2ae791df674dfb466ce40692ca6218e43 (patch)
tree0ce1c1ad368f8e0562f0b656142dcfd5c070d66c
parentd0e639c9e06d44e713170031fe05fb60ebe680af (diff)
aio: Fix a trinity splataio-fix
aio kiocb refcounting was broken - it was relying on keeping track of the number of available ring buffer entries, which it needs to do anyways; then at shutdown time it'd wait for completions to be delivered until the # of available ring buffer entries equalled what it was initialized to. Problem with that is that the ring buffer is mapped writable into userspace, so userspace could futz with the head and tail pointers to cause the kernel to see extra completions, and cause free_ioctx() to return while there were still outstanding kiocbs. Which would be bad. Fix is just to directly refcount the kiocbs - which is more straightforward, and with the new percpu refcounting code doesn't cost us any cacheline bouncing which was the whole point of the original scheme. Also clean up ioctx_alloc()'s error path and fix a bug where it wasn't subtracting from aio_nr if ioctx_add_table() failed. Signed-off-by: Kent Overstreet <kmo@daterainc.com>
-rw-r--r--fs/aio.c129
1 files changed, 48 insertions, 81 deletions
diff --git a/fs/aio.c b/fs/aio.c
index 067e3d340c35..ee77dc13d5b2 100644
--- a/fs/aio.c
+++ b/fs/aio.c
@@ -80,6 +80,8 @@ struct kioctx {
struct percpu_ref users;
atomic_t dead;
+ struct percpu_ref reqs;
+
unsigned long user_id;
struct __percpu kioctx_cpu *cpu;
@@ -107,7 +109,6 @@ struct kioctx {
struct page **ring_pages;
long nr_pages;
- struct rcu_head rcu_head;
struct work_struct free_work;
struct {
@@ -412,26 +413,34 @@ static int kiocb_cancel(struct kioctx *ctx, struct kiocb *kiocb)
return cancel(kiocb);
}
-static void free_ioctx_rcu(struct rcu_head *head)
+static void free_ioctx(struct work_struct *work)
{
- struct kioctx *ctx = container_of(head, struct kioctx, rcu_head);
+ struct kioctx *ctx = container_of(work, struct kioctx, free_work);
+
+ pr_debug("freeing %p\n", ctx);
+ aio_free_ring(ctx);
free_percpu(ctx->cpu);
kmem_cache_free(kioctx_cachep, ctx);
}
+static void free_ioctx_reqs(struct percpu_ref *ref)
+{
+ struct kioctx *ctx = container_of(ref, struct kioctx, reqs);
+
+ INIT_WORK(&ctx->free_work, free_ioctx);
+ schedule_work(&ctx->free_work);
+}
+
/*
* When this function runs, the kioctx has been removed from the "hash table"
* and ctx->users has dropped to 0, so we know no more kiocbs can be submitted -
* now it's safe to cancel any that need to be.
*/
-static void free_ioctx(struct work_struct *work)
+static void free_ioctx_users(struct percpu_ref *ref)
{
- struct kioctx *ctx = container_of(work, struct kioctx, free_work);
- struct aio_ring *ring;
+ struct kioctx *ctx = container_of(ref, struct kioctx, users);
struct kiocb *req;
- unsigned cpu, avail;
- DEFINE_WAIT(wait);
spin_lock_irq(&ctx->ctx_lock);
@@ -445,54 +454,8 @@ static void free_ioctx(struct work_struct *work)
spin_unlock_irq(&ctx->ctx_lock);
- for_each_possible_cpu(cpu) {
- struct kioctx_cpu *kcpu = per_cpu_ptr(ctx->cpu, cpu);
-
- atomic_add(kcpu->reqs_available, &ctx->reqs_available);
- kcpu->reqs_available = 0;
- }
-
- while (1) {
- prepare_to_wait(&ctx->wait, &wait, TASK_UNINTERRUPTIBLE);
-
- ring = kmap_atomic(ctx->ring_pages[0]);
- avail = (ring->head <= ring->tail)
- ? ring->tail - ring->head
- : ctx->nr_events - ring->head + ring->tail;
-
- atomic_add(avail, &ctx->reqs_available);
- ring->head = ring->tail;
- kunmap_atomic(ring);
-
- if (atomic_read(&ctx->reqs_available) >= ctx->nr_events - 1)
- break;
-
- schedule();
- }
- finish_wait(&ctx->wait, &wait);
-
- WARN_ON(atomic_read(&ctx->reqs_available) > ctx->nr_events - 1);
-
- aio_free_ring(ctx);
-
- pr_debug("freeing %p\n", ctx);
-
- /*
- * Here the call_rcu() is between the wait_event() for reqs_active to
- * hit 0, and freeing the ioctx.
- *
- * aio_complete() decrements reqs_active, but it has to touch the ioctx
- * after to issue a wakeup so we use rcu.
- */
- call_rcu(&ctx->rcu_head, free_ioctx_rcu);
-}
-
-static void free_ioctx_ref(struct percpu_ref *ref)
-{
- struct kioctx *ctx = container_of(ref, struct kioctx, users);
-
- INIT_WORK(&ctx->free_work, free_ioctx);
- schedule_work(&ctx->free_work);
+ percpu_ref_kill(&ctx->reqs);
+ percpu_ref_put(&ctx->reqs);
}
static int ioctx_add_table(struct kioctx *ctx, struct mm_struct *mm)
@@ -551,6 +514,16 @@ static int ioctx_add_table(struct kioctx *ctx, struct mm_struct *mm)
}
}
+static void aio_nr_sub(unsigned nr)
+{
+ spin_lock(&aio_nr_lock);
+ if (WARN_ON(aio_nr - nr > aio_nr))
+ aio_nr = 0;
+ else
+ aio_nr -= nr;
+ spin_unlock(&aio_nr_lock);
+}
+
/* ioctx_alloc
* Allocates and initializes an ioctx. Returns an ERR_PTR if it failed.
*/
@@ -588,8 +561,11 @@ static struct kioctx *ioctx_alloc(unsigned nr_events)
ctx->max_reqs = nr_events;
- if (percpu_ref_init(&ctx->users, free_ioctx_ref))
- goto out_freectx;
+ if (percpu_ref_init(&ctx->users, free_ioctx_users))
+ goto err;
+
+ if (percpu_ref_init(&ctx->reqs, free_ioctx_reqs))
+ goto err;
spin_lock_init(&ctx->ctx_lock);
spin_lock_init(&ctx->completion_lock);
@@ -600,10 +576,10 @@ static struct kioctx *ioctx_alloc(unsigned nr_events)
ctx->cpu = alloc_percpu(struct kioctx_cpu);
if (!ctx->cpu)
- goto out_freeref;
+ goto err;
if (aio_setup_ring(ctx) < 0)
- goto out_freepcpu;
+ goto err;
atomic_set(&ctx->reqs_available, ctx->nr_events - 1);
ctx->req_batch = (ctx->nr_events - 1) / (num_possible_cpus() * 4);
@@ -615,7 +591,8 @@ static struct kioctx *ioctx_alloc(unsigned nr_events)
if (aio_nr + nr_events > (aio_max_nr * 2UL) ||
aio_nr + nr_events < aio_nr) {
spin_unlock(&aio_nr_lock);
- goto out_cleanup;
+ err = -EAGAIN;
+ goto err;
}
aio_nr += ctx->max_reqs;
spin_unlock(&aio_nr_lock);
@@ -624,23 +601,19 @@ static struct kioctx *ioctx_alloc(unsigned nr_events)
err = ioctx_add_table(ctx, mm);
if (err)
- goto out_cleanup_put;
+ goto err_cleanup;
pr_debug("allocated ioctx %p[%ld]: mm=%p mask=0x%x\n",
ctx, ctx->user_id, mm, ctx->nr_events);
return ctx;
-out_cleanup_put:
- percpu_ref_put(&ctx->users);
-out_cleanup:
- err = -EAGAIN;
+err_cleanup:
+ aio_nr_sub(ctx->max_reqs);
+err:
aio_free_ring(ctx);
-out_freepcpu:
free_percpu(ctx->cpu);
-out_freeref:
+ free_percpu(ctx->reqs.pcpu_count);
free_percpu(ctx->users.pcpu_count);
-out_freectx:
- put_aio_ring_file(ctx);
kmem_cache_free(kioctx_cachep, ctx);
pr_debug("error allocating ioctx %d\n", err);
return ERR_PTR(err);
@@ -675,10 +648,7 @@ static void kill_ioctx(struct mm_struct *mm, struct kioctx *ctx)
* -EAGAIN with no ioctxs actually in use (as far as userspace
* could tell).
*/
- spin_lock(&aio_nr_lock);
- BUG_ON(aio_nr - ctx->max_reqs > aio_nr);
- aio_nr -= ctx->max_reqs;
- spin_unlock(&aio_nr_lock);
+ aio_nr_sub(ctx->max_reqs);
if (ctx->mmap_size)
vm_munmap(ctx->mmap_base, ctx->mmap_size);
@@ -810,6 +780,8 @@ static inline struct kiocb *aio_get_req(struct kioctx *ctx)
if (unlikely(!req))
goto out_put;
+ percpu_ref_get(&ctx->reqs);
+
req->ki_ctx = ctx;
return req;
out_put:
@@ -879,12 +851,6 @@ void aio_complete(struct kiocb *iocb, long res, long res2)
return;
}
- /*
- * Take rcu_read_lock() in case the kioctx is being destroyed, as we
- * need to issue a wakeup after incrementing reqs_available.
- */
- rcu_read_lock();
-
if (iocb->ki_list.next) {
unsigned long flags;
@@ -959,7 +925,7 @@ void aio_complete(struct kiocb *iocb, long res, long res2)
if (waitqueue_active(&ctx->wait))
wake_up(&ctx->wait);
- rcu_read_unlock();
+ percpu_ref_put(&ctx->reqs);
}
EXPORT_SYMBOL(aio_complete);
@@ -1370,6 +1336,7 @@ static int io_submit_one(struct kioctx *ctx, struct iocb __user *user_iocb,
return 0;
out_put_req:
put_reqs_available(ctx, 1);
+ percpu_ref_put(&ctx->reqs);
kiocb_free(req);
return ret;
}