提交 730198c8 编写于 作者: C Christoph Hellwig 提交者: Greg Kroah-Hartman

aio: separate out ring reservation from req allocation

commit 432c79978c33ecef91b1b04cea6936c20810da29 upstream.

This is in preparation for certain types of IO not needing a ring
reserveration.
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Signed-off-by: NJens Axboe <axboe@kernel.dk>
Cc: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
上级 b3373253
......@@ -902,7 +902,7 @@ static void put_reqs_available(struct kioctx *ctx, unsigned nr)
local_irq_restore(flags);
}
static bool get_reqs_available(struct kioctx *ctx)
static bool __get_reqs_available(struct kioctx *ctx)
{
struct kioctx_cpu *kcpu;
bool ret = false;
......@@ -994,6 +994,14 @@ static void user_refill_reqs_available(struct kioctx *ctx)
spin_unlock_irq(&ctx->completion_lock);
}
static bool get_reqs_available(struct kioctx *ctx)
{
if (__get_reqs_available(ctx))
return true;
user_refill_reqs_available(ctx);
return __get_reqs_available(ctx);
}
/* aio_get_req
* Allocate a slot for an aio request.
* Returns NULL if no requests are free.
......@@ -1002,24 +1010,15 @@ static inline struct aio_kiocb *aio_get_req(struct kioctx *ctx)
{
struct aio_kiocb *req;
if (!get_reqs_available(ctx)) {
user_refill_reqs_available(ctx);
if (!get_reqs_available(ctx))
return NULL;
}
req = kmem_cache_alloc(kiocb_cachep, GFP_KERNEL|__GFP_ZERO);
if (unlikely(!req))
goto out_put;
return NULL;
percpu_ref_get(&ctx->reqs);
INIT_LIST_HEAD(&req->ki_list);
refcount_set(&req->ki_refcnt, 0);
req->ki_ctx = ctx;
return req;
out_put:
put_reqs_available(ctx, 1);
return NULL;
}
static struct kioctx *lookup_ioctx(unsigned long ctx_id)
......@@ -1813,9 +1812,13 @@ static int io_submit_one(struct kioctx *ctx, struct iocb __user *user_iocb,
return -EINVAL;
}
if (!get_reqs_available(ctx))
return -EAGAIN;
ret = -EAGAIN;
req = aio_get_req(ctx);
if (unlikely(!req))
return -EAGAIN;
goto out_put_reqs_available;
if (iocb.aio_flags & IOCB_FLAG_RESFD) {
/*
......@@ -1878,11 +1881,12 @@ static int io_submit_one(struct kioctx *ctx, struct iocb __user *user_iocb,
goto out_put_req;
return 0;
out_put_req:
put_reqs_available(ctx, 1);
percpu_ref_put(&ctx->reqs);
if (req->ki_eventfd)
eventfd_ctx_put(req->ki_eventfd);
kmem_cache_free(kiocb_cachep, req);
out_put_reqs_available:
put_reqs_available(ctx, 1);
return ret;
}
......
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