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Subject[PATCH 2/8] keep io_event in aio_kiocb
Date
From: Al Viro <viro@zeniv.linux.org.uk>

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---
fs/aio.c | 56 +++++++++++++++++++++-----------------------------------
1 file changed, 21 insertions(+), 35 deletions(-)

diff --git a/fs/aio.c b/fs/aio.c
index 363d7d7c8bff..2249a7a1d6b3 100644
--- a/fs/aio.c
+++ b/fs/aio.c
@@ -204,8 +204,7 @@ struct aio_kiocb {
struct kioctx *ki_ctx;
kiocb_cancel_fn *ki_cancel;

- struct iocb __user *ki_user_iocb; /* user's aiocb */
- __u64 ki_user_data; /* user's data for completion */
+ struct io_event ki_res;

struct list_head ki_list; /* the aio core uses this
* for cancellation */
@@ -1087,10 +1086,9 @@ static inline void iocb_put(struct aio_kiocb *iocb)
static void aio_fill_event(struct io_event *ev, struct aio_kiocb *iocb,
long res, long res2)
{
- ev->obj = (u64)(unsigned long)iocb->ki_user_iocb;
- ev->data = iocb->ki_user_data;
- ev->res = res;
- ev->res2 = res2;
+ iocb->ki_res.res = res;
+ iocb->ki_res.res2 = res2;
+ *ev = iocb->ki_res;
}

/* aio_complete
@@ -1126,7 +1124,7 @@ static void aio_complete(struct aio_kiocb *iocb, long res, long res2)
flush_dcache_page(ctx->ring_pages[pos / AIO_EVENTS_PER_PAGE]);

pr_debug("%p[%u]: %p: %p %Lx %lx %lx\n",
- ctx, tail, iocb, iocb->ki_user_iocb, iocb->ki_user_data,
+ ctx, tail, iocb, (void __user *)iocb->ki_res.obj, iocb->ki_res.data,
res, res2);

/* after flagging the request as done, we
@@ -1674,13 +1672,13 @@ static int aio_poll_wake(struct wait_queue_entry *wait, unsigned mode, int sync,
__poll_t mask = key_to_poll(key);
unsigned long flags;

+ /* for instances that support it check for an event match first: */
+ if (mask && !(mask & req->events))
+ return 0;
+
req->woken = true;

- /* for instances that support it check for an event match first: */
if (mask) {
- if (!(mask & req->events))
- return 0;
-
/*
* Try to complete the iocb inline if we can. Use
* irqsave/irqrestore because not all filesystems (e.g. fuse)
@@ -1844,8 +1842,10 @@ static int __io_submit_one(struct kioctx *ctx, const struct iocb *iocb,
goto out_put_req;
}

- req->ki_user_iocb = user_iocb;
- req->ki_user_data = iocb->aio_data;
+ req->ki_res.obj = (u64)(unsigned long)user_iocb;
+ req->ki_res.data = iocb->aio_data;
+ req->ki_res.res = 0;
+ req->ki_res.res2 = 0;

switch (iocb->aio_lio_opcode) {
case IOCB_CMD_PREAD:
@@ -2002,24 +2002,6 @@ COMPAT_SYSCALL_DEFINE3(io_submit, compat_aio_context_t, ctx_id,
}
#endif

-/* lookup_kiocb
- * Finds a given iocb for cancellation.
- */
-static struct aio_kiocb *
-lookup_kiocb(struct kioctx *ctx, struct iocb __user *iocb)
-{
- struct aio_kiocb *kiocb;
-
- assert_spin_locked(&ctx->ctx_lock);
-
- /* TODO: use a hash or array, this sucks. */
- list_for_each_entry(kiocb, &ctx->active_reqs, ki_list) {
- if (kiocb->ki_user_iocb == iocb)
- return kiocb;
- }
- return NULL;
-}
-
/* sys_io_cancel:
* Attempts to cancel an iocb previously passed to io_submit. If
* the operation is successfully cancelled, the resulting event is
@@ -2037,6 +2019,7 @@ SYSCALL_DEFINE3(io_cancel, aio_context_t, ctx_id, struct iocb __user *, iocb,
struct aio_kiocb *kiocb;
int ret = -EINVAL;
u32 key;
+ u64 obj = (u64)(unsigned long)iocb;

if (unlikely(get_user(key, &iocb->aio_key)))
return -EFAULT;
@@ -2048,10 +2031,13 @@ SYSCALL_DEFINE3(io_cancel, aio_context_t, ctx_id, struct iocb __user *, iocb,
return -EINVAL;

spin_lock_irq(&ctx->ctx_lock);
- kiocb = lookup_kiocb(ctx, iocb);
- if (kiocb) {
- ret = kiocb->ki_cancel(&kiocb->rw);
- list_del_init(&kiocb->ki_list);
+ /* TODO: use a hash or array, this sucks. */
+ list_for_each_entry(kiocb, &ctx->active_reqs, ki_list) {
+ if (kiocb->ki_res.obj == obj) {
+ ret = kiocb->ki_cancel(&kiocb->rw);
+ list_del_init(&kiocb->ki_list);
+ break;
+ }
}
spin_unlock_irq(&ctx->ctx_lock);

--
2.11.0
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