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nvme: lift the file open code from nvme_ctrl_get_by_path

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Lift opening the file open/close code from nvme_ctrl_get_by_path into
the caller, just keeping a simple nvme_ctrl_from_file() helper.

Signed-off-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
[hch: refactored a bit, split the bug fixes into a separate prep patch]
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Logan Gunthorpe <logang@deltatee.com>
This commit is contained in:
Chaitanya Kulkarni
2020-09-16 18:11:02 -07:00
committed by Christoph Hellwig
parent 163090c14a
commit b2702aaaa4
3 changed files with 22 additions and 32 deletions
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25
drivers/nvme/host/core.c
View File

@@ -4668,28 +4668,13 @@ void nvme_sync_queues(struct nvme_ctrl *ctrl)
}
EXPORT_SYMBOL_GPL(nvme_sync_queues);
struct nvme_ctrl *nvme_ctrl_get_by_path(const char *path)
struct nvme_ctrl *nvme_ctrl_from_file(struct file *file)
{
struct nvme_ctrl *ctrl;
struct file *f;
f = filp_open(path, O_RDWR, 0);
if (IS_ERR(f))
return ERR_CAST(f);
if (f->f_op != &nvme_dev_fops) {
ctrl = ERR_PTR(-EINVAL);
goto out_close;
}
ctrl = f->private_data;
nvme_get_ctrl(ctrl);
out_close:
filp_close(f, NULL);
return ctrl;
if (file->f_op != &nvme_dev_fops)
return NULL;
return file->private_data;
}
EXPORT_SYMBOL_NS_GPL(nvme_ctrl_get_by_path, NVME_TARGET_PASSTHRU);
EXPORT_SYMBOL_NS_GPL(nvme_ctrl_from_file, NVME_TARGET_PASSTHRU);
/*
* Check we didn't inadvertently grow the command structure sizes:

2
drivers/nvme/host/nvme.h
View File

@@ -822,7 +822,7 @@ static inline void nvme_hwmon_init(struct nvme_ctrl *ctrl) { }
u32 nvme_command_effects(struct nvme_ctrl *ctrl, struct nvme_ns *ns,
u8 opcode);
void nvme_execute_passthru_rq(struct request *rq);
struct nvme_ctrl *nvme_ctrl_get_by_path(const char *path);
struct nvme_ctrl *nvme_ctrl_from_file(struct file *file);
struct nvme_ns *nvme_find_get_ns(struct nvme_ctrl *ctrl, unsigned nsid);
void nvme_put_ns(struct nvme_ns *ns);

27
drivers/nvme/target/passthru.c
View File

@@ -474,6 +474,7 @@ u16 nvmet_parse_passthru_admin_cmd(struct nvmet_req *req)
int nvmet_passthru_ctrl_enable(struct nvmet_subsys *subsys)
{
struct nvme_ctrl *ctrl;
struct file *file;
int ret = -EINVAL;
void *old;
@@ -488,24 +489,29 @@ int nvmet_passthru_ctrl_enable(struct nvmet_subsys *subsys)
goto out_unlock;
}
ctrl = nvme_ctrl_get_by_path(subsys->passthru_ctrl_path);
if (IS_ERR(ctrl)) {
ret = PTR_ERR(ctrl);
file = filp_open(subsys->passthru_ctrl_path, O_RDWR, 0);
if (IS_ERR(file)) {
ret = PTR_ERR(file);
goto out_unlock;
}
ctrl = nvme_ctrl_from_file(file);
if (!ctrl) {
pr_err("failed to open nvme controller %s\n",
subsys->passthru_ctrl_path);
goto out_unlock;
goto out_put_file;
}
old = xa_cmpxchg(&passthru_subsystems, ctrl->cntlid, NULL,
subsys, GFP_KERNEL);
if (xa_is_err(old)) {
ret = xa_err(old);
goto out_put_ctrl;
goto out_put_file;
}
if (old)
goto out_put_ctrl;
goto out_put_file;
subsys->passthru_ctrl = ctrl;
subsys->ver = ctrl->vs;
@@ -516,13 +522,12 @@ int nvmet_passthru_ctrl_enable(struct nvmet_subsys *subsys)
NVME_TERTIARY(subsys->ver));
subsys->ver = NVME_VS(1, 2, 1);
}
nvme_get_ctrl(ctrl);
__module_get(subsys->passthru_ctrl->ops->module);
mutex_unlock(&subsys->lock);
return 0;
ret = 0;
out_put_ctrl:
nvme_put_ctrl(ctrl);
out_put_file:
filp_close(file, NULL);
out_unlock:
mutex_unlock(&subsys->lock);
return ret;