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nvme: fix controller ioctl through ns_head

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In multipath case, we should consider namespace attachment with
controllers in a subsystem when we find out the live controller for the
namespace.  This patch manually reverted the commit 3557a44097
("nvme: don't bother to look up a namespace for controller ioctls") with
few more updates to nvme_ns_head_chr_ioctl which has been newly updated.

Fixes: 3557a44097 ("nvme: don't bother to look up a namespace for
controller ioctls")
Cc: Christoph Hellwig <hch@lst.de>
Signed-off-by: Minwoo Im <minwoo.im.dev@gmail.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Minwoo Im 2021-04-22 17:04:07 +09:00 committed by Christoph Hellwig
parent cd2c7545ae
commit 48145b6256
3 changed files with 41 additions and 47 deletions
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22
drivers/nvme/host/core.c
View File

@ -1999,28 +1999,6 @@ static const struct block_device_operations nvme_bdev_ops = {
.pr_ops = &nvme_pr_ops,
};
#ifdef CONFIG_NVME_MULTIPATH
struct nvme_ctrl *nvme_find_get_live_ctrl(struct nvme_subsystem *subsys)
{
struct nvme_ctrl *ctrl;
int ret;
ret = mutex_lock_killable(&nvme_subsystems_lock);
if (ret)
return ERR_PTR(ret);
list_for_each_entry(ctrl, &subsys->ctrls, subsys_entry) {
if (ctrl->state == NVME_CTRL_LIVE)
goto found;
}
mutex_unlock(&nvme_subsystems_lock);
return ERR_PTR(-EWOULDBLOCK);
found:
nvme_get_ctrl(ctrl);
mutex_unlock(&nvme_subsystems_lock);
return ctrl;
}
#endif /* CONFIG_NVME_MULTIPATH */
static int nvme_wait_ready(struct nvme_ctrl *ctrl, u64 cap, bool enabled)
{
unsigned long timeout =

65
drivers/nvme/host/ioctl.c
View File

@ -370,41 +370,45 @@ long nvme_ns_chr_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
}
#ifdef CONFIG_NVME_MULTIPATH
static int nvme_ns_head_ctrl_ioctl(struct nvme_ns_head *head,
unsigned int cmd, void __user *argp)
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 = nvme_find_get_live_ctrl(head->subsys);
struct nvme_ctrl *ctrl = ns->ctrl;
int ret;
if (IS_ERR(ctrl))
return PTR_ERR(ctrl);
ret = nvme_ctrl_ioctl(ctrl, cmd, argp);
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_ns_ioctl(struct nvme_ns_head *head,
unsigned int cmd, void __user *argp)
{
int srcu_idx = srcu_read_lock(&head->srcu);
struct nvme_ns *ns = nvme_find_path(head);
int ret = -EWOULDBLOCK;
if (ns)
ret = nvme_ns_ioctl(ns, cmd, argp);
srcu_read_unlock(&head->srcu, srcu_idx);
return ret;
}
int nvme_ns_head_ioctl(struct block_device *bdev, fmode_t mode,
unsigned int cmd, unsigned long arg)
{
struct nvme_ns_head *head = bdev->bd_disk->private_data;
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(head, cmd, argp);
return nvme_ns_head_ns_ioctl(head, cmd, argp);
ret = nvme_ns_head_ctrl_ioctl(ns, cmd, argp, head, srcu_idx);
else {
ret = nvme_ns_ioctl(ns, cmd, argp);
nvme_put_ns_from_disk(head, srcu_idx);
}
return ret;
}
long nvme_ns_head_chr_ioctl(struct file *file, unsigned int cmd,
@ -414,10 +418,23 @@ long nvme_ns_head_chr_ioctl(struct file *file, unsigned int cmd,
struct nvme_ns_head *head =
container_of(cdev, struct nvme_ns_head, cdev);
void __user *argp = (void __user *)arg;
struct nvme_ns *ns;
int srcu_idx, ret;
srcu_idx = srcu_read_lock(&head->srcu);
ns = nvme_find_path(head);
if (!ns) {
srcu_read_unlock(&head->srcu, srcu_idx);
return -EWOULDBLOCK;
}
if (is_ctrl_ioctl(cmd))
return nvme_ns_head_ctrl_ioctl(head, cmd, argp);
return nvme_ns_head_ns_ioctl(head, cmd, argp);
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;
}
#endif /* CONFIG_NVME_MULTIPATH */

1
drivers/nvme/host/nvme.h
View File

@ -664,7 +664,6 @@ struct nvme_ns *nvme_get_ns_from_disk(struct gendisk *disk,
void nvme_put_ns_from_disk(struct nvme_ns_head *head, int idx);
bool nvme_tryget_ns_head(struct nvme_ns_head *head);
void nvme_put_ns_head(struct nvme_ns_head *head);
struct nvme_ctrl *nvme_find_get_live_ctrl(struct nvme_subsystem *subsys);
int nvme_cdev_add(struct cdev *cdev, struct device *cdev_device,
const struct file_operations *fops, struct module *owner);
void nvme_cdev_del(struct cdev *cdev, struct device *cdev_device);