lkml.org 
[lkml]   [2019]   [Aug]   [28]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    Patch in this message
    /
    From
    Date
    Subject[PATCH v8 01/13] nvme-core: introduce nvme_ctrl_get_by_path()
    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>
    ---
    drivers/nvme/host/core.c | 24 ++++++++++++++++++++++++
    drivers/nvme/host/nvme.h | 2 ++
    2 files changed, 26 insertions(+)

    diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
    index d3d6b7bd6903..776eff8c5ba7 100644
    --- a/drivers/nvme/host/core.c
    +++ b/drivers/nvme/host/core.c
    @@ -2834,6 +2834,30 @@ static const struct file_operations nvme_dev_fops = {
    .compat_ioctl = nvme_dev_ioctl,
    };

    +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);
    +
    static ssize_t nvme_sysfs_reset(struct device *dev,
    struct device_attribute *attr, const char *buf,
    size_t count)
    diff --git a/drivers/nvme/host/nvme.h b/drivers/nvme/host/nvme.h
    index 2d678fb968c7..42d59445ae6b 100644
    --- a/drivers/nvme/host/nvme.h
    +++ b/drivers/nvme/host/nvme.h
    @@ -489,6 +489,8 @@ int nvme_get_log(struct nvme_ctrl *ctrl, u32 nsid, u8 log_page, u8 lsp,
    extern const struct attribute_group *nvme_ns_id_attr_groups[];
    extern const struct block_device_operations nvme_ns_head_ops;

    +struct nvme_ctrl *nvme_ctrl_get_by_path(const char *path);
    +
    #ifdef CONFIG_NVME_MULTIPATH
    static inline bool nvme_ctrl_use_ana(struct nvme_ctrl *ctrl)
    {
    --
    2.20.1
    \
     
     \ /
      Last update: 2019-08-28 23:56    [W:2.806 / U:0.004 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site