lib/fsdev: mount and umount API introduced

This patch introduces SPDK fsdev spdk_fsdev_mount and spdk_fsdev_umount
APIs, the SPDK fsdev analogues of FUSE_INIT and FUSE_DESTROY.

The corresponding fs

lib/fsdev: mount and umount API introduced

This patch introduces SPDK fsdev spdk_fsdev_mount and spdk_fsdev_umount
APIs, the SPDK fsdev analogues of FUSE_INIT and FUSE_DESTROY.

The corresponding fsdev module handlers are optional (as any other),
however failing the INIT handler will fail the FUSE_INIT and therefore
the host's mount.

The spdk_fsdev_open() API doesn't get the open_opts parameter anymore.
It became mount_opts now.

Change-Id: I316a31f6999b9fabe6cee51c87fdd0e6e49ed569
Signed-off-by: Anton Nayshtut <anayshtut@nvidia.com>
Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/25009
Reviewed-by: Ben Walker <ben@nvidia.com>
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Community-CI: Mellanox Build Bot
Reviewed-by: Jim Harris <jim.harris@samsung.com>
Community-CI: Broadcom CI <spdk-ci.pdl@broadcom.com>
Community-CI: Community CI Samsung <spdk.community.ci.samsung@gmail.com>

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examples/fsdev: Add hello_world fsdev example

Change-Id: Ia8bdc89abed6486b5057aec7dae77d92d126b9b2
Signed-off-by: Evgeniy Kochetov <evgeniik@nvidia.com>
Signed-off-by: Anton Nayshtut <anayshtut@nvid

examples/fsdev: Add hello_world fsdev example

Change-Id: Ia8bdc89abed6486b5057aec7dae77d92d126b9b2
Signed-off-by: Evgeniy Kochetov <evgeniik@nvidia.com>
Signed-off-by: Anton Nayshtut <anayshtut@nvidia.com>
Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/22536
Reviewed-by: Ben Walker <ben@nvidia.com>
Reviewed-by: Jim Harris <jim.harris@samsung.com>
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Community-CI: Mellanox Build Bot

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