From: Logan Gunthorpe <logang@deltatee.com>
To: linux-kernel@vger.kernel.org, linux-nvme@lists.infradead.org
Cc: Christoph Hellwig <hch@lst.de>, Sagi Grimberg <sagi@grimberg.me>,
Keith Busch <kbusch@kernel.org>, Jens Axboe <axboe@fb.com>,
Chaitanya Kulkarni <Chaitanya.Kulkarni@wdc.com>,
Max Gurtovoy <maxg@mellanox.com>,
Stephen Bates <sbates@raithlin.com>,
Logan Gunthorpe <logang@deltatee.com>
Subject: [PATCH v16 4/9] nvme-core: Introduce nvme_ctrl_get_by_path()
Date: Fri, 24 Jul 2020 11:25:15 -0600 [thread overview]
Message-ID: <20200724172520.16318-5-logang@deltatee.com> (raw)
In-Reply-To: <20200724172520.16318-1-logang@deltatee.com>
nvme_ctrl_get_by_path() is analogous to blkdev_get_by_path() except it
gets a struct nvme_ctrl from the path to its char dev (/dev/nvme0).
It makes use of filp_open() to open the file and uses the private
data to obtain a pointer to the struct nvme_ctrl. If the fops of the
file do not match, -EINVAL is returned.
The purpose of this function is to support NVMe-OF target passthru
and is exported under the NVME_TARGET_PASSTHRU namespace.
Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
Reviewed-by: Max Gurtovoy <maxg@mellanox.com>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
---
drivers/nvme/host/core.c | 23 +++++++++++++++++++++++
drivers/nvme/host/nvme.h | 1 +
2 files changed, 24 insertions(+)
diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index ccca36f881d6..35b1d13db2e9 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -4575,6 +4575,29 @@ 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 *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;
+}
+EXPORT_SYMBOL_NS_GPL(nvme_ctrl_get_by_path, NVME_TARGET_PASSTHRU);
+
/*
* Check we didn't inadvertently grow the command structure sizes:
*/
diff --git a/drivers/nvme/host/nvme.h b/drivers/nvme/host/nvme.h
index c43e0e4e0b97..4bec44ab5a96 100644
--- a/drivers/nvme/host/nvme.h
+++ b/drivers/nvme/host/nvme.h
@@ -787,5 +787,6 @@ 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);
#endif /* _NVME_H */
--
2.20.1
next prev parent reply other threads:[~2020-07-24 17:25 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-24 17:25 [PATCH v16 0/9] nvmet: add target passthru commands support Logan Gunthorpe
2020-07-24 17:25 ` [PATCH v16 1/9] nvme-core: Clear any SGL flags in passthru commands Logan Gunthorpe
2020-07-24 17:25 ` [PATCH v16 2/9] nvme: Create helper function to obtain command effects Logan Gunthorpe
2020-07-24 17:25 ` [PATCH v16 3/9] nvme: Introduce nvme_execute_passthru_rq to call nvme_passthru_[start|end]() Logan Gunthorpe
2020-07-24 17:25 ` Logan Gunthorpe [this message]
2020-07-24 17:25 ` [PATCH v16 5/9] nvme: Export nvme_find_get_ns() and nvme_put_ns() Logan Gunthorpe
2020-07-24 17:25 ` [PATCH v16 6/9] nvmet-passthru: Add passthru code to process commands Logan Gunthorpe
2020-07-24 19:33 ` Keith Busch
2020-07-24 19:40 ` Logan Gunthorpe
2020-07-26 15:41 ` Christoph Hellwig
2020-07-27 15:44 ` Logan Gunthorpe
2020-07-24 17:25 ` [PATCH v16 7/9] nvmet-passthru: Add enable/disable helpers Logan Gunthorpe
2020-07-24 17:25 ` [PATCH v16 8/9] nvmet-configfs: Introduce passthru configfs interface Logan Gunthorpe
2020-07-24 17:25 ` [PATCH v16 9/9] nvmet-passthru: Introduce NVMet passthru Kconfig option Logan Gunthorpe
2020-07-24 19:35 ` [PATCH v16 0/9] nvmet: add target passthru commands support Keith Busch
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