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nvme: simplify block device ioctl handling for the !multipath case

Browse source 
Only use the existing ioctl handler for the multipath case, and add a
simpler one that reverts to the pre-multipath case for not shared
use case.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Keith Busch <kbusch@kernel.org>
Reviewed-by: Javier González <javier.gonz@samsung.com>
This commit is contained in:
Christoph Hellwig 2020-08-14 10:55:32 +02:00
parent 89b3d6e605
commit 2f907f7f96
1 changed files with 47 additions and 36 deletions
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83
drivers/nvme/host/core.c
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@ -1757,30 +1757,17 @@ static bool is_ctrl_ioctl(unsigned int cmd)
return false;
}
static int nvme_handle_ctrl_ioctl(struct nvme_ns *ns, unsigned int cmd,
void __user *argp,
struct nvme_ns_head *head,
int srcu_idx)
static int nvme_ctrl_ioctl(struct nvme_ctrl *ctrl, unsigned int cmd,
void __user *argp)
{
struct nvme_ctrl *ctrl = ns->ctrl;
int ret;
nvme_get_ctrl(ns->ctrl);
nvme_put_ns_from_disk(head, srcu_idx);
switch (cmd) {
case NVME_IOCTL_ADMIN_CMD:
ret = nvme_user_cmd(ctrl, NULL, argp);
break;
return nvme_user_cmd(ctrl, NULL, argp);
case NVME_IOCTL_ADMIN64_CMD:
ret = nvme_user_cmd64(ctrl, NULL, argp);
break;
return nvme_user_cmd64(ctrl, NULL, argp);
default:
ret = sed_ioctl(ctrl->opal_dev, cmd, argp);
break;
return sed_ioctl(ctrl->opal_dev, cmd, argp);
}
nvme_put_ctrl(ctrl);
return ret;
}
#ifdef COMPAT_FOR_U64_ALIGNMENT
@ -1832,26 +1819,12 @@ static int nvme_ns_ioctl(struct nvme_ns *ns, unsigned int cmd,
static int nvme_ioctl(struct block_device *bdev, fmode_t mode,
unsigned int cmd, unsigned long arg)
{
struct nvme_ns_head *head = NULL;
struct nvme_ns *ns = bdev->bd_disk->private_data;
void __user *argp = (void __user *)arg;
struct nvme_ns *ns;
int srcu_idx, ret;
ns = nvme_get_ns_from_disk(bdev->bd_disk, &head, &srcu_idx);
if (unlikely(!ns))
return -EWOULDBLOCK;
/*
* Handle ioctls that apply to the controller instead of the namespace
* seperately and drop the ns SRCU reference early. This avoids a
* deadlock when deleting namespaces using the passthrough interface.
*/
if (is_ctrl_ioctl(cmd))
return nvme_handle_ctrl_ioctl(ns, cmd, argp, head, srcu_idx);
ret = nvme_ns_ioctl(ns, cmd, argp);
nvme_put_ns_from_disk(head, srcu_idx);
return ret;
return nvme_ctrl_ioctl(ns->ctrl, cmd, argp);
return nvme_ns_ioctl(ns, cmd, argp);
}
static int nvme_open(struct block_device *bdev, fmode_t mode)
@ -2363,12 +2336,50 @@ static void nvme_ns_head_release(struct gendisk *disk, fmode_t mode)
nvme_put_ns_head(disk->private_data);
}
static int nvme_ns_head_ctrl_ioctl(struct nvme_ns *ns, unsigned int cmd,
void __user *argp, struct nvme_ns_head *head, int srcu_idx)
{
struct nvme_ctrl *ctrl = ns->ctrl;
int ret;
nvme_get_ctrl(ns->ctrl);
nvme_put_ns_from_disk(head, srcu_idx);
ret = nvme_ctrl_ioctl(ns->ctrl, cmd, argp);
nvme_put_ctrl(ctrl);
return ret;
}
static int nvme_ns_head_ioctl(struct block_device *bdev, fmode_t mode,
unsigned int cmd, unsigned long arg)
{
struct nvme_ns_head *head = NULL;
void __user *argp = (void __user *)arg;
struct nvme_ns *ns;
int srcu_idx, ret;
ns = nvme_get_ns_from_disk(bdev->bd_disk, &head, &srcu_idx);
if (unlikely(!ns))
return -EWOULDBLOCK;
/*
* Handle ioctls that apply to the controller instead of the namespace
* seperately and drop the ns SRCU reference early. This avoids a
* deadlock when deleting namespaces using the passthrough interface.
*/
if (is_ctrl_ioctl(cmd))
return nvme_ns_head_ctrl_ioctl(ns, cmd, argp, head, srcu_idx);
ret = nvme_ns_ioctl(ns, cmd, argp);
nvme_put_ns_from_disk(head, srcu_idx);
return ret;
}
const struct block_device_operations nvme_ns_head_ops = {
.owner = THIS_MODULE,
.submit_bio = nvme_ns_head_submit_bio,
.open = nvme_ns_head_open,
.release = nvme_ns_head_release,
.ioctl = nvme_ioctl,
.ioctl = nvme_ns_head_ioctl,
.getgeo = nvme_getgeo,
.report_zones = nvme_report_zones,
.pr_ops = &nvme_pr_ops,