Commit 2c0bc387 authored by Daniel Verkamp's avatar Daniel Verkamp
Browse files

bdev: add "split" virtual blockdev example 



This virtual block device takes an underlying block device and splits it
into several smaller equal-sized block devices.

Change-Id: I6f6e686c1177b2e4885f7e88809ad329caae55bd
Signed-off-by: default avatarDaniel Verkamp <daniel.verkamp@intel.com>
parent efccac8c

etc/spdk/iscsi.conf.in

+13 −1
Original line number Diff line number Diff line
@@ -120,7 +120,7 @@ 
# Of course, users can disable offload even it is available.

[Malloc]

  # Number of Malloc targets

  NumberOfLuns 1

  NumberOfLuns 3

  # Malloc targets are 128M

  LunSizeInMB 128

  # Block size. Default is 512 bytes.
@@ -140,6 +140,18 @@ 
  AIO /dev/sdb

  AIO /dev/sdc



# The Split virtual block device slices block devices into multiple smaller bdevs.

[Split]

  # Syntax:

  #   Split <bdev> <count> [<size_in_megabytes>]



  # Split Malloc1 into two equally-sized portions, Malloc1p0 and Malloc1p1

  Split Malloc1 2



  # Split Malloc2 into eight 1-megabyte portions, Malloc2p0 ... Malloc2p7,

  # leaving the rest of the device inaccessible

  Split Malloc2 8 1



# Users should change the TargetNode section(s) below to match the

#  desired iSCSI target node configuration.

# TargetName, Mapping, LUN0 are minimum required

etc/spdk/nvmf.conf.in

+12 −0
Original line number Diff line number Diff line
@@ -76,6 +76,18 @@ 
  # Units in microseconds.

  AdminPollRate 100000



# The Split virtual block device slices block devices into multiple smaller bdevs.

[Split]

  # Syntax:

  #   Split <bdev> <count> [<size_in_megabytes>]



  # Split Malloc2 into two equally-sized portions, Malloc2p0 and Malloc2p1

  Split Malloc2 2



  # Split Malloc3 into eight 1-megabyte portions, Malloc3p0 ... Malloc3p7,

  # leaving the rest of the device inaccessible

  Split Malloc3 8 1



# Define an NVMf Subsystem.

# - NQN is required and must be unique.

# - Core may be set or not. If set, the specified subsystem will run on

include/spdk_internal/bdev.h

+1 −0
Original line number Diff line number Diff line
@@ -157,6 +157,7 @@ struct spdk_bdev_io *spdk_bdev_get_child_io(struct spdk_bdev_io *parent, 
		struct spdk_bdev *bdev,

		spdk_bdev_io_completion_cb cb,

		void *cb_arg);

void spdk_bdev_io_resubmit(struct spdk_bdev_io *bdev_io, struct spdk_bdev *new_bdev);

void spdk_bdev_io_complete(struct spdk_bdev_io *bdev_io,

			   enum spdk_bdev_io_status status);

lib/bdev/Makefile

+1 −1
Original line number Diff line number Diff line
@@ -38,7 +38,7 @@ CFLAGS += $(ENV_CFLAGS) -I. 
C_SRCS = bdev.c

LIBNAME = bdev



DIRS-y += malloc nvme rpc

DIRS-y += malloc nvme rpc split



ifeq ($(OS),Linux)

DIRS-y += aio

lib/bdev/bdev.c

+16 −0
Original line number Diff line number Diff line
@@ -430,6 +430,22 @@ spdk_bdev_io_submit(struct spdk_bdev_io *bdev_io) 
	return 0;

}



void

spdk_bdev_io_resubmit(struct spdk_bdev_io *bdev_io, struct spdk_bdev *new_bdev)

{

	assert(bdev_io->status == SPDK_BDEV_IO_STATUS_PENDING);

	bdev_io->bdev = new_bdev;



	/*

	 * These fields are normally set during spdk_bdev_io_init(), but since bdev is

	 * being switched, they need to be reinitialized.

	 */

	bdev_io->gencnt = new_bdev->gencnt;

	bdev_io->ctx = new_bdev->ctxt;



	__submit_request(new_bdev, bdev_io);

}



static void

spdk_bdev_io_init(struct spdk_bdev_io *bdev_io,

		  struct spdk_bdev *bdev, void *cb_arg,