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 v15 5/9] nvme-core: Introduce nvme_ctrl_get_by_path()
Date: Thu, 16 Jul 2020 14:33:15 -0600 [thread overview]
Message-ID: <20200716203319.16022-6-logang@deltatee.com> (raw)
In-Reply-To: <20200716203319.16022-1-logang@deltatee.com>
nvme_ctrl_get_by_path() is analagous 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.
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 | 31 +++++++++++++++++++++++++++++++
drivers/nvme/host/nvme.h | 6 ++++++
2 files changed, 37 insertions(+)
diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index 817ab76d2838..6e7d5cb43a06 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -4572,6 +4572,37 @@ void nvme_sync_queues(struct nvme_ctrl *ctrl)
}
EXPORT_SYMBOL_GPL(nvme_sync_queues);
+#ifdef CONFIG_NVME_TARGET_PASSTHRU
+/*
+ * The exports that follow within this ifdef are only for
+ * use by the nvmet-passthru and should not be used for
+ * other things.
+ */
+
+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_GPL(nvme_ctrl_get_by_path);
+#endif /* CONFIG_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 13ca90bcd352..485492a98ef5 100644
--- a/drivers/nvme/host/nvme.h
+++ b/drivers/nvme/host/nvme.h
@@ -763,4 +763,10 @@ void nvme_hwmon_init(struct nvme_ctrl *ctrl);
static inline void nvme_hwmon_init(struct nvme_ctrl *ctrl) { }
#endif
+/*
+ * These functions are only for use by nvmet-passthru and are only exported
+ * if CONFIG_NVME_TARGET_PASSTHRU is set.
+ */
+struct nvme_ctrl *nvme_ctrl_get_by_path(const char *path);
+
#endif /* _NVME_H */
--
2.20.1
next prev parent reply other threads:[~2020-07-16 21:17 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-16 20:33 [PATCH v15 0/9] nvmet: add target passthru commands support Logan Gunthorpe
2020-07-16 20:33 ` [PATCH v15 1/9] nvme-core: Clear any SGL flags in passthru commands Logan Gunthorpe
2020-07-20 14:01 ` Christoph Hellwig
2020-07-16 20:33 ` [PATCH v15 2/9] nvme: Create helper function to obtain command effects Logan Gunthorpe
2020-07-20 14:04 ` Christoph Hellwig
2020-07-16 20:33 ` [PATCH v15 3/9] nvme: Move nvme_passthru_[start|end]() calls to common helper Logan Gunthorpe
2020-07-20 14:06 ` Christoph Hellwig
2020-07-16 20:33 ` [PATCH v15 4/9] nvmet-passthru: Introduce NVMet passthru Kconfig option Logan Gunthorpe
2020-07-20 14:06 ` Christoph Hellwig
2020-07-16 20:33 ` Logan Gunthorpe [this message]
2020-07-20 14:09 ` [PATCH v15 5/9] nvme-core: Introduce nvme_ctrl_get_by_path() Christoph Hellwig
2020-07-16 20:33 ` [PATCH v15 6/9] nvme: Export existing nvme core functions Logan Gunthorpe
2020-07-16 20:33 ` [PATCH v15 7/9] nvmet-passthru: Add passthru code to process commands Logan Gunthorpe
2020-07-20 14:16 ` Christoph Hellwig
2020-07-20 19:35 ` Sagi Grimberg
2020-07-20 21:41 ` Logan Gunthorpe
2020-07-20 21:58 ` Chaitanya Kulkarni
2020-07-20 22:35 ` Sagi Grimberg
2020-07-20 23:01 ` Logan Gunthorpe
2020-07-20 23:15 ` Sagi Grimberg
2020-07-20 23:17 ` Keith Busch
2020-07-20 23:28 ` Sagi Grimberg
2020-07-21 0:06 ` Keith Busch
2020-07-21 0:39 ` Sagi Grimberg
2020-07-22 21:09 ` Logan Gunthorpe
2020-07-22 22:31 ` Sagi Grimberg
2020-07-16 20:33 ` [PATCH v15 8/9] nvmet-passthru: Add enable/disable helpers Logan Gunthorpe
2020-07-16 20:33 ` [PATCH v15 9/9] nvmet-configfs: Introduce passthru configfs interface Logan Gunthorpe
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