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rnbd-clt: don't free rsp in msg_open_conf for map scenario

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For map scenario, rsp is freed in two places:

1. msg_open_conf frees rsp if rtrs_clt_request returns 0.

2. Otherwise, rsp is freed by the call sites of rtrs_clt_request.

Now, We'd like to control full lifecycle of rsp in rnbd_clt_map_device,
with that, it is feasible to pass rsp to rnbd_client_setup_device in
next commit.

For 1, it is possible to free rsp from the caller of send_usr_msg
because of the synchronization of iu->comp.wait. And we put iu later
in rnbd_clt_map_device to ensure order of release rsp and iu.

Acked-by: Jack Wang <jinpu.wang@ionos.com>
Signed-off-by: Guoqing Jiang <guoqing.jiang@linux.dev>
Link: https://lore.kernel.org/r/20220706133152.12058-3-guoqing.jiang@linux.dev
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Guoqing Jiang 2022-07-06 21:31:46 +08:00 committed by Jens Axboe
parent 9ddae3bab6
commit 52334f4a57
1 changed files with 14 additions and 4 deletions
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18
drivers/block/rnbd/rnbd-clt.c
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@ -507,6 +507,11 @@ static void msg_open_conf(struct work_struct *work)
struct rnbd_msg_open_rsp *rsp = iu->buf;
struct rnbd_clt_dev *dev = iu->dev;
int errno = iu->errno;
bool from_map = false;
/* INIT state is only triggered from rnbd_clt_map_device */
if (dev->dev_state == DEV_STATE_INIT)
from_map = true;
if (errno) {
rnbd_clt_err(dev,
@ -523,7 +528,9 @@ static void msg_open_conf(struct work_struct *work)
send_msg_close(dev, device_id, RTRS_PERMIT_NOWAIT);
}
}
kfree(rsp);
/* We free rsp in rnbd_clt_map_device for map scenario */
if (!from_map)
kfree(rsp);
wake_up_iu_comp(iu, errno);
rnbd_put_iu(dev->sess, iu);
rnbd_clt_put_dev(dev);
@ -1617,16 +1624,14 @@ struct rnbd_clt_dev *rnbd_clt_map_device(const char *sessname,
if (ret) {
rnbd_clt_put_dev(dev);
rnbd_put_iu(sess, iu);
kfree(rsp);
} else {
ret = errno;
}
rnbd_put_iu(sess, iu);
if (ret) {
rnbd_clt_err(dev,
"map_device: failed, can't open remote device, err: %d\n",
ret);
goto del_dev;
goto put_iu;
}
mutex_lock(&dev->lock);
pr_debug("Opened remote device: session=%s, path='%s'\n",
@ -1650,12 +1655,17 @@ struct rnbd_clt_dev *rnbd_clt_map_device(const char *sessname,
dev->max_hw_sectors, dev->wc, dev->fua);
mutex_unlock(&dev->lock);
kfree(rsp);
rnbd_put_iu(sess, iu);
rnbd_clt_put_sess(sess);
return dev;
send_close:
send_msg_close(dev, dev->device_id, RTRS_PERMIT_WAIT);
put_iu:
kfree(rsp);
rnbd_put_iu(sess, iu);
del_dev:
delete_dev(dev);
put_dev: