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Subject[PATCH 1/1] dm-ioband: I/O bandwidth controller
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Hi Alasdair,

I've updated dm-add-ioband.patch to fit the current dm quilt tree.
Could you please replace the patch in the tree?

Thanks,
Ryo Tsuruta

Dm-ioband is an I/O bandwidth controller implemented as a device-mapper
driver, which gives specified bandwidth to each job running on the same
physical device.

A lot more information (manual, benchmark results, all-in-one patch
and so on) is available at http://people.valinux.co.jp/~ryov/dm-ioband/ .
I welcome any feed-backs and suggestions.

Signed-off-by: Ryo Tsuruta <ryov@valinux.co.jp>
Signed-off-by: Hirokazu Takahashi <taka@valinux.co.jp>

---
Documentation/device-mapper/ioband.txt | 976 ++++++++++++++++++++++++
drivers/md/Kconfig | 13
drivers/md/Makefile | 2
drivers/md/dm-ioband-ctl.c | 1311 +++++++++++++++++++++++++++++++++
drivers/md/dm-ioband-policy.c | 456 +++++++++++
drivers/md/dm-ioband-type.c | 76 +
drivers/md/dm-ioband.h | 186 ++++
7 files changed, 3020 insertions(+)

Index: linux-2.6.30-rc1/Documentation/device-mapper/ioband.txt
===================================================================
--- /dev/null
+++ linux-2.6.30-rc1/Documentation/device-mapper/ioband.txt
@@ -0,0 +1,976 @@
+ Block I/O bandwidth control: dm-ioband
+
+ -------------------------------------------------------
+
+ Table of Contents
+
+ [1]What's dm-ioband all about?
+
+ [2]Differences from the CFQ I/O scheduler
+
+ [3]How dm-ioband works.
+
+ [4]Setup and Installation
+
+ [5]Getting started
+
+ [6]Command Reference
+
+ [7]Examples
+
+What's dm-ioband all about?
+
+ dm-ioband is an I/O bandwidth controller implemented as a device-mapper
+ driver. Several jobs using the same block device have to share the
+ bandwidth of the device. dm-ioband gives bandwidth to each job according
+ to its weight, which each job can set its own value to.
+
+ A job is a group of processes with the same pid or pgrp or uid or a
+ virtual machine such as KVM or Xen. A job can also be a cgroup by applying
+ the bio-cgroup patch, which can be found at
+ [8]http://people.valinux.co.jp/~ryov/bio-cgroup/.
+
+ +------+ +------+ +------+ +------+ +------+ +------+
+ |cgroup| |cgroup| | the | | pid | | pid | | the | jobs
+ | A | | B | |others| | X | | Y | |others|
+ +--|---+ +--|---+ +--|---+ +--|---+ +--|---+ +--|---+
+ +--V----+---V---+----V---+ +--V----+---V---+----V---+
+ | group | group | default| | group | group | default| ioband groups
+ | | | group | | | | group |
+ +-------+-------+--------+ +-------+-------+--------+
+ | ioband1 | | ioband2 | ioband devices
+ +-----------|------------+ +-----------|------------+
+ +-----------V--------------+-------------V------------+
+ | | |
+ | sdb1 | sdb2 | block devices
+ +--------------------------+--------------------------+
+
+
+ --------------------------------------------------------------------------
+
+Differences from the CFQ I/O scheduler
+
+ Dm-ioband is flexible to configure the bandwidth settings.
+
+ Dm-ioband can work with any type of I/O scheduler such as the NOOP
+ scheduler, which is often chosen for high-end storages, since it is
+ implemented outside the I/O scheduling layer. It allows both of partition
+ based bandwidth control and job --- a group of processes --- based
+ control. In addition, it can set different configuration on each block
+ device to control its bandwidth.
+
+ Meanwhile the current implementation of the CFQ scheduler has 8 IO
+ priority levels and all jobs whose processes have the same IO priority
+ share the bandwidth assigned to this level between them. And IO priority
+ is an attribute of a process, so that it equally effects to all block
+ devices.
+
+ --------------------------------------------------------------------------
+
+How dm-ioband works.
+
+ Every ioband device has one ioband group, which by default is called the
+ default group.
+
+ Ioband devices can also have extra ioband groups in them. Each ioband
+ group has a job to support and a weight. Proportional to the weight,
+ dm-ioband gives tokens to the group.
+
+ A group passes on I/O requests that its job issues to the underlying
+ layer so long as it has tokens left, while requests are blocked if there
+ aren't any tokens left in the group. Tokens are refilled once all of
+ groups that have requests on a given underlying block device use up their
+ tokens.
+
+ There are two policies for token consumption. One is that a token is
+ consumed for each I/O request. The other is that a token is consumed for
+ each I/O sector, for example, one I/O request which consists of
+ 4Kbytes(512bytes * 8 sectors) read consumes 8 tokens. A user can choose
+ either policy.
+
+ With this approach, a job running on an ioband group with large weight
+ is guaranteed a wide I/O bandwidth.
+
+ --------------------------------------------------------------------------
+
+Setup and Installation
+
+ Build a kernel with these options enabled:
+
+ CONFIG_MD
+ CONFIG_BLK_DEV_DM
+ CONFIG_DM_IOBAND
+
+
+ If compiled as module, use modprobe to load dm-ioband.
+
+ # make modules
+ # make modules_install
+ # depmod -a
+ # modprobe dm-ioband
+
+
+ "dmsetup targets" command shows all available device-mapper targets.
+ "ioband" and the version number are displayed when dm-ioband has been
+ loaded.
+
+ # dmsetup targets | grep ioband
+ ioband v1.10.2
+
+
+ --------------------------------------------------------------------------
+
+Getting started
+
+ The following is a brief description how to control the I/O bandwidth of
+ disks. In this description, we'll take one disk with two partitions as an
+ example target.
+
+ --------------------------------------------------------------------------
+
+ Create and map ioband devices
+
+ Create two ioband devices "ioband1" and "ioband2". "ioband1" is mapped
+ to "/dev/sda1" and has a weight of 40. "ioband2" is mapped to "/dev/sda2"
+ and has a weight of 10. "ioband1" can use 80% --- 40/(40+10)*100 --- of
+ the bandwidth of "/dev/sda" while "ioband2" can use 20%.
+
+ # echo "0 $(blockdev --getsize /dev/sda1) ioband /dev/sda1 1 0 0 none" \
+ "weight 0 :40" | dmsetup create ioband1
+ # echo "0 $(blockdev --getsize /dev/sda2) ioband /dev/sda2 1 0 0 none" \
+ "weight 0 :10" | dmsetup create ioband2
+
+
+ If the commands are successful then the device files
+ "/dev/mapper/ioband1" and "/dev/mapper/ioband2" will have been created.
+
+ --------------------------------------------------------------------------
+
+ Additional bandwidth control
+
+ In this example two extra ioband groups are created on "ioband1."
+
+ First, set the ioband group type as user. Next, create two ioband groups
+ that have id 1000 and 2000. Then, give weights of 30 and 20 to the ioband
+ groups respectively.
+
+ # dmsetup message ioband1 0 type user
+ # dmsetup message ioband1 0 attach 1000
+ # dmsetup message ioband1 0 attach 2000
+ # dmsetup message ioband1 0 weight 1000:30
+ # dmsetup message ioband1 0 weight 2000:20
+
+
+ Now the processes owned by uid 1000 can use 30% --- 30/(30+20+40+10)*100
+ --- of the bandwidth of "/dev/sda" when the processes issue I/O requests
+ through "ioband1." The processes owned by uid 2000 can use 20% of the
+ bandwidth likewise.
+
+ Table 1. Weight assignments
+
+ +----------------------------------------------------------------+
+ | ioband device | ioband group | ioband weight |
+ |---------------+--------------------------------+---------------|
+ | ioband1 | user id 1000 | 30 |
+ |---------------+--------------------------------+---------------|
+ | ioband1 | user id 2000 | 20 |
+ |---------------+--------------------------------+---------------|
+ | ioband1 | default group(the other users) | 40 |
+ |---------------+--------------------------------+---------------|
+ | ioband2 | default group | 10 |
+ +----------------------------------------------------------------+
+
+ --------------------------------------------------------------------------
+
+ Remove the ioband devices
+
+ Remove the ioband devices when no longer used.
+
+ # dmsetup remove ioband1
+ # dmsetup remove ioband2
+
+
+ --------------------------------------------------------------------------
+
+Command Reference
+
+ Create an ioband device
+
+ SYNOPSIS
+
+ dmsetup create IOBAND_DEVICE
+
+ DESCRIPTION
+
+ Create an ioband device with the given name IOBAND_DEVICE.
+ Generally, dmsetup reads a table from standard input. Each line of
+ the table specifies a single target and is of the form:
+
+ start_sector num_sectors "ioband" device_file ioband_device_id \
+ io_throttle io_limit ioband_group_type policy token_base \
+ :weight [ioband_group_id:weight...]
+
+
+ start_sector, num_sectors
+
+ The sector range of the underlying device where
+ dm-ioband maps.
+
+ ioband
+
+ Specify the string "ioband" as a target type.
+
+ device_file
+
+ Underlying device name.
+
+ ioband_device_id
+
+ The ID number for an ioband device. The same ID
+ must be set among the ioband devices that share the
+ same bandwidth. This is useful for grouping disk
+ drives partitioned from one disk drive such as RAID
+ drive or LVM logical striped volume.
+
+ io_throttle
+
+ Dm-ioband starts to control the bandwidth when the
+ number of BIOs in progress exceeds this value. If 0
+ is specified, the default value is used. This setting
+ applies all ioband devices which has the same ioband
+ device ID as you specified by "ioband_device_id."
+
+ io_limit
+
+ Dm-ioband blocks all I/O requests for IOBAND_DEVICE
+ when the number of BIOs in progress exceeds this
+ value. If 0 is specified, the default value is used.
+ This setting applies all ioband devices which has the
+ same ioband device ID as you specified by
+ "ioband_device_id."
+
+ ioband_group_type
+
+ Specify how to evaluate the ioband group ID. The
+ type must be one of "none", "user", "gid", "pid" or
+ "pgrp." The type "cgroup" is enabled by applying the
+ bio-cgroup patch. Specify "none" if you don't need
+ any ioband groups other than the default ioband
+ group.
+
+ policy
+
+ Specify a bandwidth control policy. A user can
+ choose either policy "weight" or "weight-iosize."
+ This setting applies all ioband devices which has the
+ same ioband device ID as you specified by
+ "ioband_device_id."
+
+ weight
+
+ This policy controls bandwidth
+ according to the proportional to the
+ weight of each ioband group based on the
+ number of I/O requests.
+
+ weight-iosize
+
+ This policy controls bandwidth
+ according to the proportional to the
+ weight of each ioband group based on the
+ number of I/O sectors.
+
+ token_base
+
+ The number of tokens which specified by token_base
+ will be distributed to all ioband groups according to
+ the proportional to the weight of each ioband group.
+ If 0 is specified, the default value is used. This
+ setting applies all ioband devices which has the same
+ ioband device ID as you specified by
+ "ioband_device_id."
+
+ ioband_group_id:weight
+
+ Set the weight of the ioband group specified by
+ ioband_group_id. If ioband_group_id is omitted, the
+ weight is assigned to the default ioband group.
+
+ EXAMPLE
+
+ Create an ioband device with the following parameters:
+
+ * Starting sector = "0"
+
+ * The number of sectors = "$(blockdev --getsize /dev/sda1)"
+
+ * Target type = "ioband"
+
+ * Underlying device name = "/dev/sda1"
+
+ * Ioband device ID = "128"
+
+ * I/O throttle = "10"
+
+ * I/O limit = "400"
+
+ * Ioband group type = "user"
+
+ * Bandwidth control policy = "weight"
+
+ * Token base = "2048"
+
+ * Weight for the default ioband group = "100"
+
+ * Weight for the ioband group 1000 = "80"
+
+ * Weight for the ioband group 2000 = "20"
+
+ * Ioband device name = "ioband1"
+
+ # echo "0 $(blockdev --getsize /dev/sda1) ioband" \
+ "/dev/sda1 128 10 400 user weight 2048 :100 1000:80 2000:20" \
+ | dmsetup create ioband1
+
+
+ Create two device groups (ID=1,2). The bandwidths of these
+ device groups will be individually controlled.
+
+ # echo "0 $(blockdev --getsize /dev/sda1) ioband /dev/sda1 1" \
+ "0 0 none weight 0 :80" | dmsetup create ioband1
+ # echo "0 $(blockdev --getsize /dev/sda2) ioband /dev/sda2 1" \
+ "0 0 none weight 0 :20" | dmsetup create ioband2
+ # echo "0 $(blockdev --getsize /dev/sdb3) ioband /dev/sdb3 2" \
+ "0 0 none weight 0 :60" | dmsetup create ioband3
+ # echo "0 $(blockdev --getsize /dev/sdb4) ioband /dev/sdb4 2" \
+ "0 0 none weight 0 :40" | dmsetup create ioband4
+
+
+ --------------------------------------------------------------------------
+
+ Remove the ioband device
+
+ SYNOPSIS
+
+ dmsetup remove IOBAND_DEVICE
+
+ DESCRIPTION
+
+ Remove the specified ioband device IOBAND_DEVICE. All the band
+ groups attached to the ioband device are also removed
+ automatically.
+
+ EXAMPLE
+
+ Remove ioband device "ioband1."
+
+ # dmsetup remove ioband1
+
+
+ --------------------------------------------------------------------------
+
+ Set an ioband group type
+
+ SYNOPSIS
+
+ dmsetup message IOBAND_DEVICE 0 type TYPE
+
+ DESCRIPTION
+
+ Set an ioband group type of IOBAND_DEVICE. TYPE must be one of
+ "none", "user", "gid", "pid" or "pgrp." The type "cgroup" is
+ enabled by applying the bio-cgroup patch. Once the type is set,
+ new ioband groups can be created on IOBAND_DEVICE.
+
+ EXAMPLE
+
+ Set the ioband group type of ioband device "ioband1" to "user."
+
+ # dmsetup message ioband1 0 type user
+
+
+ --------------------------------------------------------------------------
+
+ Create an ioband group
+
+ SYNOPSIS
+
+ dmsetup message IOBAND_DEVICE 0 attach ID
+
+ DESCRIPTION
+
+ Create an ioband group and attach it to IOBAND_DEVICE. ID
+ specifies user-id, group-id, process-id or process-group-id
+ depending the ioband group type of IOBAND_DEVICE.
+
+ EXAMPLE
+
+ Create an ioband group which consists of all processes with
+ user-id 1000 and attach it to ioband device "ioband1."
+
+ # dmsetup message ioband1 0 type user
+ # dmsetup message ioband1 0 attach 1000
+
+
+ --------------------------------------------------------------------------
+
+ Detach the ioband group
+
+ SYNOPSIS
+
+ dmsetup message IOBAND_DEVICE 0 detach ID
+
+ DESCRIPTION
+
+ Detach the ioband group specified by ID from ioband device
+ IOBAND_DEVICE.
+
+ EXAMPLE
+
+ Detach the ioband group with ID "2000" from ioband device
+ "ioband2."
+
+ # dmsetup message ioband2 0 detach 1000
+
+
+ --------------------------------------------------------------------------
+
+ Set bandwidth control policy
+
+ SYNOPSIS
+
+ dmsetup message IOBAND_DEVICE 0 policy policy
+
+ DESCRIPTION
+
+ Set a bandwidth control policy. A user can choose either policy
+ "weight" or "weight-iosize." This setting applies all ioband
+ devices which has the same ioband device ID as IOBAND_DEVICE.
+
+ weight
+
+ This policy controls bandwidth according to the
+ proportional to the weight of each ioband group based
+ on the number of I/O requests.
+
+ weight-iosize
+
+ This policy controls bandwidth according to the
+ proportional to the weight of each ioband group based
+ on the number of I/O sectors.
+
+ EXAMPLE
+
+ Set bandwidth control policy of ioband devices which have the
+ same ioband device ID as "ioband1" to "weight-iosize."
+
+ # dmsetup message ioband1 0 policy weight-iosize
+
+
+ --------------------------------------------------------------------------
+
+ Set the weight of an ioband group
+
+ SYNOPSIS
+
+ dmsetup message IOBAND_DEVICE 0 weight VAL
+
+ dmsetup message IOBAND_DEVICE 0 weight ID:VAL
+
+ DESCRIPTION
+
+ Set the weight of the ioband group specified by ID. Set the
+ weight of the default ioband group of IOBAND_DEVICE if ID isn't
+ specified.
+
+ The following example means that "ioband1" can use 80% ---
+ 40/(40+10)*100 --- of the bandwidth of the underlying block device
+ while "ioband2" can use 20%.
+
+ # dmsetup message ioband1 0 weight 40
+ # dmsetup message ioband2 0 weight 10
+
+
+ The following lines have the same effect as the above:
+
+ # dmsetup message ioband1 0 weight 4
+ # dmsetup message ioband2 0 weight 1
+
+
+ VAL must be an integer larger than 0. The default value, which
+ is assigned to newly created ioband groups, is 100.
+
+ EXAMPLE
+
+ Set the weight of the default ioband group of "ioband1" to 40.
+
+ # dmsetup message ioband1 0 weight 40
+
+
+ Set the weight of the ioband group of "ioband1" with ID "1000"
+ to 10.
+
+ # dmsetup message ioband1 0 weight 1000:10
+
+
+ --------------------------------------------------------------------------
+
+ Set the number of tokens
+
+ SYNOPSIS
+
+ dmsetup message IOBAND_DEVICE 0 token VAL
+
+ DESCRIPTION
+
+ The number of tokens will be distributed to all ioband groups
+ according to the proportional to the weight of each ioband group.
+ If 0 is specified, the default value is used. This setting applies
+ all ioband devices which has the same ioband device ID as
+ IOBAND_DEVICE
+
+ EXAMPLE
+
+ Set the number of tokens to 256.
+
+ # dmsetup message ioband1 0 token 256
+
+
+ --------------------------------------------------------------------------
+
+ Set a limit of how many tokens are carried over
+
+ SYNOPSIS
+
+ dmsetup message IOBAND_DEVICE 0 carryover VAL
+
+ DESCRIPTION
+
+ When dm-ioband tries to refill an ioband group with tokens after
+ another ioband group is already refilled several times, dm-ioband
+ determines the number of tokens to refill by multiplying the
+ number of tokens refilled once by the smaller of how many times
+ the other group is already refilled or this limit. If 0 is
+ specified, the default value is used. This setting applies all
+ ioband devices which has the same ioband device ID as
+ IOBAND_DEVICE.
+
+ EXAMPLE
+
+ Set a limit for "ioband1" to 2.
+
+ # dmsetup message ioband1 0 carryover 2
+
+
+ --------------------------------------------------------------------------
+
+ Set I/O throttling
+
+ SYNOPSIS
+
+ dmsetup message IOBAND_DEVICE 0 io_throttle VAL
+
+ DESCRIPTION
+
+ Dm-ioband starts to control the bandwidth when the number of
+ BIOs in progress exceeds this value. If 0 is specified, the
+ default value is used. This setting applies all ioband devices
+ which has the same ioband device ID as IOBAND_DEVICE.
+
+ EXAMPLE
+
+ Set the I/O throttling value of "ioband1" to 16.
+
+ # dmsetup message ioband1 0 io_throttle 16
+
+
+ --------------------------------------------------------------------------
+
+ Set I/O limiting
+
+ SYNOPSIS
+
+ dmsetup message IOBAND_DEVICE 0 io_limit VAL
+
+ DESCRIPTION
+
+ Dm-ioband blocks all I/O requests for IOBAND_DEVICE when the
+ number of BIOs in progress exceeds this value. If 0 is specified,
+ the default value is used. This setting applies all ioband devices
+ which has the same ioband device ID as IOBAND_DEVICE.
+
+ EXAMPLE
+
+ Set the I/O limiting value of "ioband1" to 128.
+
+ # dmsetup message ioband1 0 io_limit 128
+
+
+ --------------------------------------------------------------------------
+
+ Display settings
+
+ SYNOPSIS
+
+ dmsetup table --target ioband
+
+ DESCRIPTION
+
+ Display the current table for the ioband device in a format. See
+ "dmsetup create" command for information on the table format.
+
+ EXAMPLE
+
+ The following output shows the current table of "ioband1."
+
+ # dmsetup table --target ioband
+ ioband: 0 32129937 ioband1 8:29 128 10 400 user weight \
+ 2048 :100 1000:80 2000:20
+
+
+ --------------------------------------------------------------------------
+
+ Display Statistics
+
+ SYNOPSIS
+
+ dmsetup status --target ioband
+
+ DESCRIPTION
+
+ Display the statistics of all the ioband devices whose target
+ type is "ioband."
+
+ The output format is as below. the first five columns shows:
+
+ * ioband device name
+
+ * logical start sector of the device (must be 0)
+
+ * device size in sectors
+
+ * target type (must be "ioband")
+
+ * device group ID
+
+ The remaining columns show the statistics of each ioband group
+ on the band device. Each group uses seven columns for its
+ statistics.
+
+ * ioband group ID (-1 means default)
+
+ * total read requests
+
+ * delayed read requests
+
+ * total read sectors
+
+ * total write requests
+
+ * delayed write requests
+
+ * total write sectors
+
+ EXAMPLE
+
+ The following output shows the statistics of two ioband devices.
+ Ioband2 only has the default ioband group and ioband1 has three
+ (default, 1001, 1002) ioband groups.
+
+ # dmsetup status
+ ioband2: 0 44371467 ioband 128 -1 143 90 424 122 78 352
+ ioband1: 0 44371467 ioband 128 -1 223 172 408 211 136 600 1001 \
+ 166 107 472 139 95 352 1002 211 146 520 210 147 504
+
+
+ --------------------------------------------------------------------------
+
+ Reset status counter
+
+ SYNOPSIS
+
+ dmsetup message IOBAND_DEVICE 0 reset
+
+ DESCRIPTION
+
+ Reset the statistics of ioband device IOBAND_DEVICE.
+
+ EXAMPLE
+
+ Reset the statistics of "ioband1."
+
+ # dmsetup message ioband1 0 reset
+
+
+ --------------------------------------------------------------------------
+
+Examples
+
+ Example #1: Bandwidth control on Partitions
+
+ This example describes how to control the bandwidth with disk
+ partitions. The following diagram illustrates the configuration of this
+ example. You may want to run a database on /dev/mapper/ioband1 and web
+ applications on /dev/mapper/ioband2.
+
+ /mnt1 /mnt2 mount points
+ | |
+ +-------------V------------+ +-------------V------------+
+ | /dev/mapper/ioband1 | | /dev/mapper/ioband2 | ioband devices
+ +--------------------------+ +--------------------------+
+ | default group | | default group | ioband groups
+ | (80) | | (40) | (weight)
+ +-------------|------------+ +-------------|------------+
+ | |
+ +-------------V-------------+--------------V------------+
+ | /dev/sda1 | /dev/sda2 | partitions
+ +---------------------------+---------------------------+
+
+
+ To setup the above configuration, follow these steps:
+
+ 1. Create ioband devices with the same device group ID and assign
+ weights of 80 and 40 to the default ioband groups respectively.
+
+ # echo "0 $(blockdev --getsize /dev/sda1) ioband /dev/sda1 1 0 0" \
+ "none weight 0 :80" | dmsetup create ioband1
+ # echo "0 $(blockdev --getsize /dev/sda2) ioband /dev/sda2 1 0 0" \
+ "none weight 0 :40" | dmsetup create ioband2
+
+
+ 2. Create filesystems on the ioband devices and mount them.
+
+ # mkfs.ext3 /dev/mapper/ioband1
+ # mount /dev/mapper/ioband1 /mnt1
+
+ # mkfs.ext3 /dev/mapper/ioband2
+ # mount /dev/mapper/ioband2 /mnt2
+
+
+ --------------------------------------------------------------------------
+
+ Example #2: Bandwidth control on Logical Volumes
+
+ This example is similar to the example #1 but it uses LVM logical
+ volumes instead of disk partitions. This example shows how to configure
+ ioband devices on two striped logical volumes.
+
+ /mnt1 /mnt2 mount points
+ | |
+ +-------------V------------+ +-------------V------------+
+ | /dev/mapper/ioband1 | | /dev/mapper/ioband2 | ioband devices
+ +--------------------------+ +--------------------------+
+ | default group | | default group | ioband groups
+ | (80) | | (40) | (weight)
+ +-------------|------------+ +-------------|------------+
+ | |
+ +-------------V------------+ +-------------V------------+
+ | /dev/mapper/lv0 | | /dev/mapper/lv1 | striped logical
+ | | | | volumes
+ +-------------------------------------------------------+
+ | vg0 | volume group
+ +-------------|----------------------------|------------+
+ | |
+ +-------------V------------+ +-------------V------------+
+ | /dev/sdb | | /dev/sdc | physical disks
+ +--------------------------+ +--------------------------+
+
+
+ To setup the above configuration, follow these steps:
+
+ 1. Initialize the partitions for use by LVM.
+
+ # pvcreate /dev/sdb
+ # pvcreate /dev/sdc
+
+
+ 2. Create a new volume group named "vg0" with /dev/sdb and /dev/sdc.
+
+ # vgcreate vg0 /dev/sdb /dev/sdc
+
+
+ 3. Create two logical volumes in "vg0." The volumes have to be striped.
+
+ # lvcreate -n lv0 -i 2 -I 64 vg0 -L 1024M
+ # lvcreate -n lv1 -i 2 -I 64 vg0 -L 1024M
+
+
+ The rest is the same as the example #1.
+
+ 4. Create ioband devices corresponding to each logical volume and
+ assign weights of 80 and 40 to the default ioband groups respectively.
+
+ # echo "0 $(blockdev --getsize /dev/mapper/vg0-lv0)" \
+ "ioband /dev/mapper/vg0-lv0 1 0 0 none weight 0 :80" | \
+ dmsetup create ioband1
+ # echo "0 $(blockdev --getsize /dev/mapper/vg0-lv1)" \
+ "ioband /dev/mapper/vg0-lv1 1 0 0 none weight 0 :40" | \
+ dmsetup create ioband2
+
+
+ 5. Create filesystems on the ioband devices and mount them.
+
+ # mkfs.ext3 /dev/mapper/ioband1
+ # mount /dev/mapper/ioband1 /mnt1
+
+ # mkfs.ext3 /dev/mapper/ioband2
+ # mount /dev/mapper/ioband2 /mnt2
+
+
+ --------------------------------------------------------------------------
+
+ Example #3: Bandwidth control on processes
+
+ This example describes how to control the bandwidth with groups of
+ processes. You may also want to run an additional application on the same
+ machine described in the example #1. This example shows how to add a new
+ ioband group for this application.
+
+ /mnt1 /mnt2 mount points
+ | |
+ +-------------V------------+ +-------------V------------+
+ | /dev/mapper/ioband1 | | /dev/mapper/ioband2 | ioband devices
+ +-------------+------------+ +-------------+------------+
+ | default | | user=1000 | default | ioband groups
+ | (80) | | (20) | (40) | (weight)
+ +-------------+------------+ +-------------+------------+
+ | |
+ +-------------V-------------+--------------V------------+
+ | /dev/sda1 | /dev/sda2 | partitions
+ +---------------------------+---------------------------+
+
+
+ The following shows to set up a new ioband group on the machine that is
+ already configured as the example #1. The application will have a weight
+ of 20 and run with user-id 1000 on /dev/mapper/ioband2.
+
+ 1. Set the type of ioband2 to "user."
+
+ # dmsetup message ioband2 0 type user.
+
+
+ 2. Create a new ioband group on ioband2.
+
+ # dmsetup message ioband2 0 attach 1000
+
+
+ 3. Assign weight of 10 to this newly created ioband group.
+
+ # dmsetup message ioband2 0 weight 1000:20
+
+
+ --------------------------------------------------------------------------
+
+ Example #4: Bandwidth control for Xen virtual block devices
+
+ This example describes how to control the bandwidth for Xen virtual
+ block devices. The following diagram illustrates the configuration of this
+ example.
+
+ Virtual Machine 1 Virtual Machine 2 virtual machines
+ | |
+ +-------------V------------+ +-------------V------------+
+ | /dev/xvda1 | | /dev/xvda1 | virtual block
+ +-------------|------------+ +-------------|------------+ devices
+ | |
+ +-------------V------------+ +-------------V------------+
+ | /dev/mapper/ioband1 | | /dev/mapper/ioband2 | ioband devices
+ +--------------------------+ +--------------------------+
+ | default group | | default group | ioband groups
+ | (80) | | (40) | (weight)
+ +-------------|------------+ +-------------|------------+
+ | |
+ +-------------V-------------+--------------V------------+
+ | /dev/sda1 | /dev/sda2 | partitions
+ +---------------------------+---------------------------+
+
+
+ The followings shows how to map ioband device "ioband1" and "ioband2" to
+ virtual block device "/dev/xvda1 on Virtual Machine 1" and "/dev/xvda1 on
+ Virtual Machine 2" respectively on the machine configured as the example
+ #1. Add the following lines to the configuration files that are referenced
+ when creating "Virtual Machine 1" and "Virtual Machine 2."
+
+ For "Virtual Machine 1"
+ disk = [ 'phy:/dev/mapper/ioband1,xvda,w' ]
+
+ For "Virtual Machine 2"
+ disk = [ 'phy:/dev/mapper/ioband2,xvda,w' ]
+
+
+ --------------------------------------------------------------------------
+
+ Example #5: Bandwidth control for Xen blktap devices
+
+ This example describes how to control the bandwidth for Xen virtual
+ block devices when Xen blktap devices are used. The following diagram
+ illustrates the configuration of this example.
+
+ Virtual Machine 1 Virtual Machine 2 virtual machines
+ | |
+ +-------------V------------+ +-------------V------------+
+ | /dev/xvda1 | | /dev/xvda1 | virtual block
+ +-------------|------------+ +-------------|------------+ devices
+ | |
+ +-------------V----------------------------V------------+
+ | /dev/mapper/ioband1 | ioband device
+ +---------------------------+---------------------------+
+ | default group | default group | ioband groups
+ | (80) | (40) | (weight)
+ +-------------|-------------+--------------|------------+
+ | |
+ +-------------|----------------------------|------------+
+ | +----------V----------+ +----------V---------+ |
+ | | vm1.img | | vm2.img | | disk image files
+ | +---------------------+ +--------------------+ |
+ | /vmdisk | mount point
+ +---------------------------|---------------------------+
+ |
+ +---------------------------V---------------------------+
+ | /dev/sda1 | partition
+ +-------------------------------------------------------+
+
+
+ To setup the above configuration, follow these steps:
+
+ 1. Create an ioband device.
+
+ # echo "0 $(blockdev --getsize /dev/sda1) ioband /dev/sda1" \
+ "1 0 0 none weight 0 :100" | dmsetup create ioband1
+
+
+ 2. Add the following lines to the configuration files that are
+ referenced when creating "Virtual Machine 1" and "Virtual Machine 2."
+ Disk image files "/vmdisk/vm1.img" and "/vmdisk/vm2.img" will be used.
+
+ For "Virtual Machine 1"
+ disk = [ 'tap:aio:/vmdisk/vm1.img,xvda,w', ]
+
+ For "Virtual Machine 1"
+ disk = [ 'tap:aio:/vmdisk/vm2.img,xvda,w', ]
+
+
+ 3. Run the virtual machines.
+
+ # xm create vm1
+ # xm create vm2
+
+
+ 4. Find out the process IDs of the daemons which control the blktap
+ devices.
+
+ # lsof /vmdisk/disk[12].img
+ COMMAND PID USER FD TYPE DEVICE SIZE NODE NAME
+ tapdisk 15011 root 11u REG 253,0 2147483648 48961 /vmdisk/vm1.img
+ tapdisk 15276 root 13u REG 253,0 2147483648 48962 /vmdisk/vm2.img
+
+
+ 5. Create new ioband groups of pid 15011 and pid 15276, which are
+ process IDs of the tapdisks, and assign weight of 80 and 40 to the
+ groups respectively.
+
+ # dmsetup message ioband1 0 type pid
+ # dmsetup message ioband1 0 attach 15011
+ # dmsetup message ioband1 0 weight 15011:80
+ # dmsetup message ioband1 0 attach 15276
+ # dmsetup message ioband1 0 weight 15276:40
Index: linux-2.6.30-rc1/drivers/md/Kconfig
===================================================================
--- linux-2.6.30-rc1.orig/drivers/md/Kconfig
+++ linux-2.6.30-rc1/drivers/md/Kconfig
@@ -264,4 +264,17 @@ config DM_UEVENT
---help---
Generate udev events for DM events.

+config DM_IOBAND
+ tristate "I/O bandwidth control (EXPERIMENTAL)"
+ depends on BLK_DEV_DM && EXPERIMENTAL
+ ---help---
+ This device-mapper target allows to define how the
+ available bandwidth of a storage device should be
+ shared between processes, cgroups, the partitions or the LUNs.
+
+ Information on how to use dm-ioband is available in:
+ <file:Documentation/device-mapper/ioband.txt>.
+
+ If unsure, say N.
+
endif # MD
Index: linux-2.6.30-rc1/drivers/md/Makefile
===================================================================
--- linux-2.6.30-rc1.orig/drivers/md/Makefile
+++ linux-2.6.30-rc1/drivers/md/Makefile
@@ -8,6 +8,7 @@ dm-multipath-y += dm-path-selector.o dm-
dm-snapshot-y += dm-snap.o dm-exception-store.o dm-snap-transient.o \
dm-snap-persistent.o
dm-mirror-y += dm-raid1.o
+dm-ioband-y += dm-ioband-ctl.o dm-ioband-policy.o dm-ioband-type.o
md-mod-y += md.o bitmap.o
raid456-y += raid5.o
raid6_pq-y += raid6algos.o raid6recov.o raid6tables.o \
@@ -39,6 +40,7 @@ obj-$(CONFIG_DM_MULTIPATH) += dm-multipa
obj-$(CONFIG_DM_SNAPSHOT) += dm-snapshot.o
obj-$(CONFIG_DM_MIRROR) += dm-mirror.o dm-log.o dm-region-hash.o
obj-$(CONFIG_DM_ZERO) += dm-zero.o
+obj-$(CONFIG_DM_IOBAND) += dm-ioband.o

quiet_cmd_unroll = UNROLL $@
cmd_unroll = $(PERL) $(srctree)/$(src)/unroll.pl $(UNROLL) \
Index: linux-2.6.30-rc1/drivers/md/dm-ioband-ctl.c
===================================================================
--- /dev/null
+++ linux-2.6.30-rc1/drivers/md/dm-ioband-ctl.c
@@ -0,0 +1,1311 @@
+/*
+ * Copyright (C) 2008 VA Linux Systems Japan K.K.
+ * Authors: Hirokazu Takahashi <taka@valinux.co.jp>
+ * Ryo Tsuruta <ryov@valinux.co.jp>
+ *
+ * I/O bandwidth control
+ *
+ * This file is released under the GPL.
+ */
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/bio.h>
+#include <linux/slab.h>
+#include <linux/workqueue.h>
+#include <linux/rbtree.h>
+#include "dm.h"
+#include "md.h"
+#include "dm-ioband.h"
+
+#define POLICY_PARAM_START 6
+#define POLICY_PARAM_DELIM "=:,"
+
+static LIST_HEAD(ioband_device_list);
+/* to protect ioband_device_list */
+static DEFINE_SPINLOCK(ioband_devicelist_lock);
+
+static void suspend_ioband_device(struct ioband_device *, unsigned long, int);
+static void resume_ioband_device(struct ioband_device *);
+static void ioband_conduct(struct work_struct *);
+static void ioband_hold_bio(struct ioband_group *, struct bio *);
+static struct bio *ioband_pop_bio(struct ioband_group *);
+static int ioband_set_param(struct ioband_group *, char *, char *);
+static int ioband_group_attach(struct ioband_group *, int, char *);
+static int ioband_group_type_select(struct ioband_group *, char *);
+
+static void do_nothing(void) {}
+
+static int policy_init(struct ioband_device *dp, char *name,
+ int argc, char **argv)
+{
+ struct policy_type *p;
+ struct ioband_group *gp;
+ unsigned long flags;
+ int r;
+
+ for (p = dm_ioband_policy_type; p->p_name; p++) {
+ if (!strcmp(name, p->p_name))
+ break;
+ }
+ if (!p->p_name)
+ return -EINVAL;
+
+ spin_lock_irqsave(&dp->g_lock, flags);
+ if (dp->g_policy == p) {
+ /* do nothing if the same policy is already set */
+ spin_unlock_irqrestore(&dp->g_lock, flags);
+ return 0;
+ }
+
+ suspend_ioband_device(dp, flags, 1);
+ list_for_each_entry(gp, &dp->g_groups, c_list)
+ dp->g_group_dtr(gp);
+
+ /* switch to the new policy */
+ dp->g_policy = p;
+ r = p->p_policy_init(dp, argc, argv);
+ if (!r) {
+ if (!dp->g_hold_bio)
+ dp->g_hold_bio = ioband_hold_bio;
+ if (!dp->g_pop_bio)
+ dp->g_pop_bio = ioband_pop_bio;
+
+ list_for_each_entry(gp, &dp->g_groups, c_list)
+ dp->g_group_ctr(gp, NULL);
+ }
+ resume_ioband_device(dp);
+ spin_unlock_irqrestore(&dp->g_lock, flags);
+ return r;
+}
+
+static struct ioband_device *alloc_ioband_device(char *name,
+ int io_throttle, int io_limit)
+{
+ struct ioband_device *dp, *new_dp;
+ unsigned long flags;
+
+ new_dp = kzalloc(sizeof(struct ioband_device), GFP_KERNEL);
+ if (!new_dp)
+ return NULL;
+
+ /*
+ * Prepare its own workqueue as generic_make_request() may
+ * potentially block the workqueue when submitting BIOs.
+ */
+ new_dp->g_ioband_wq = create_workqueue("kioband");
+ if (!new_dp->g_ioband_wq) {
+ kfree(new_dp);
+ return NULL;
+ }
+
+ spin_lock_irqsave(&ioband_devicelist_lock, flags);
+ list_for_each_entry(dp, &ioband_device_list, g_list) {
+ if (!strcmp(dp->g_name, name)) {
+ dp->g_ref++;
+ spin_unlock_irqrestore(&ioband_devicelist_lock, flags);
+ destroy_workqueue(new_dp->g_ioband_wq);
+ kfree(new_dp);
+ return dp;
+ }
+ }
+
+ INIT_DELAYED_WORK(&new_dp->g_conductor, ioband_conduct);
+ INIT_LIST_HEAD(&new_dp->g_groups);
+ INIT_LIST_HEAD(&new_dp->g_list);
+ spin_lock_init(&new_dp->g_lock);
+ mutex_init(&new_dp->g_lock_device);
+ bio_list_init(&new_dp->g_urgent_bios);
+ new_dp->g_io_throttle = io_throttle;
+ new_dp->g_io_limit[READ] = io_limit;
+ new_dp->g_io_limit[WRITE] = io_limit;
+ new_dp->g_issued[READ] = 0;
+ new_dp->g_issued[WRITE] = 0;
+ new_dp->g_blocked = 0;
+ new_dp->g_ref = 1;
+ new_dp->g_flags = 0;
+ strlcpy(new_dp->g_name, name, sizeof(new_dp->g_name));
+ new_dp->g_policy = NULL;
+ new_dp->g_hold_bio = NULL;
+ new_dp->g_pop_bio = NULL;
+ init_waitqueue_head(&new_dp->g_waitq);
+ init_waitqueue_head(&new_dp->g_waitq_suspend);
+ init_waitqueue_head(&new_dp->g_waitq_flush);
+ list_add_tail(&new_dp->g_list, &ioband_device_list);
+
+ spin_unlock_irqrestore(&ioband_devicelist_lock, flags);
+ return new_dp;
+}
+
+static void release_ioband_device(struct ioband_device *dp)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&ioband_devicelist_lock, flags);
+ dp->g_ref--;
+ if (dp->g_ref > 0) {
+ spin_unlock_irqrestore(&ioband_devicelist_lock, flags);
+ return;
+ }
+ list_del(&dp->g_list);
+ spin_unlock_irqrestore(&ioband_devicelist_lock, flags);
+ destroy_workqueue(dp->g_ioband_wq);
+ kfree(dp);
+}
+
+static int is_ioband_device_flushed(struct ioband_device *dp,
+ int wait_completion)
+{
+ struct ioband_group *gp;
+
+ if (wait_completion && dp->g_issued[READ] + dp->g_issued[WRITE] > 0)
+ return 0;
+ if (dp->g_blocked || waitqueue_active(&dp->g_waitq))
+ return 0;
+ list_for_each_entry(gp, &dp->g_groups, c_list)
+ if (waitqueue_active(&gp->c_waitq))
+ return 0;
+ return 1;
+}
+
+static void suspend_ioband_device(struct ioband_device *dp,
+ unsigned long flags, int wait_completion)
+{
+ struct ioband_group *gp;
+
+ /* block incoming bios */
+ set_device_suspended(dp);
+
+ /* wake up all blocked processes and go down all ioband groups */
+ wake_up_all(&dp->g_waitq);
+ list_for_each_entry(gp, &dp->g_groups, c_list) {
+ if (!is_group_down(gp)) {
+ set_group_down(gp);
+ set_group_need_up(gp);
+ }
+ wake_up_all(&gp->c_waitq);
+ }
+
+ /* flush the already mapped bios */
+ spin_unlock_irqrestore(&dp->g_lock, flags);
+ queue_delayed_work(dp->g_ioband_wq, &dp->g_conductor, 0);
+ flush_workqueue(dp->g_ioband_wq);
+
+ /* wait for all processes to wake up and bios to release */
+ spin_lock_irqsave(&dp->g_lock, flags);
+ wait_event_lock_irq(dp->g_waitq_flush,
+ is_ioband_device_flushed(dp, wait_completion),
+ dp->g_lock, do_nothing());
+}
+
+static void resume_ioband_device(struct ioband_device *dp)
+{
+ struct ioband_group *gp;
+
+ /* go up ioband groups */
+ list_for_each_entry(gp, &dp->g_groups, c_list) {
+ if (group_need_up(gp)) {
+ clear_group_need_up(gp);
+ clear_group_down(gp);
+ }
+ }
+
+ /* accept incoming bios */
+ wake_up_all(&dp->g_waitq_suspend);
+ clear_device_suspended(dp);
+}
+
+static struct ioband_group *ioband_group_find(struct ioband_group *head, int id)
+{
+ struct rb_node *node = head->c_group_root.rb_node;
+
+ while (node) {
+ struct ioband_group *p =
+ container_of(node, struct ioband_group, c_group_node);
+
+ if (p->c_id == id || id == IOBAND_ID_ANY)
+ return p;
+ node = (id < p->c_id) ? node->rb_left : node->rb_right;
+ }
+ return NULL;
+}
+
+static void ioband_group_add_node(struct rb_root *root, struct ioband_group *gp)
+{
+ struct rb_node **node = &root->rb_node, *parent = NULL;
+ struct ioband_group *p;
+
+ while (*node) {
+ p = container_of(*node, struct ioband_group, c_group_node);
+ parent = *node;
+ node = (gp->c_id < p->c_id) ?
+ &(*node)->rb_left : &(*node)->rb_right;
+ }
+
+ rb_link_node(&gp->c_group_node, parent, node);
+ rb_insert_color(&gp->c_group_node, root);
+}
+
+static int ioband_group_init(struct ioband_group *gp,
+ struct ioband_group *head,
+ struct ioband_device *dp, int id, char *param)
+{
+ unsigned long flags;
+ int r;
+
+ INIT_LIST_HEAD(&gp->c_list);
+ bio_list_init(&gp->c_blocked_bios);
+ bio_list_init(&gp->c_prio_bios);
+ gp->c_id = id; /* should be verified */
+ gp->c_blocked = 0;
+ gp->c_prio_blocked = 0;
+ memset(gp->c_stat, 0, sizeof(gp->c_stat));
+ init_waitqueue_head(&gp->c_waitq);
+ gp->c_flags = 0;
+ gp->c_group_root = RB_ROOT;
+ gp->c_banddev = dp;
+
+ spin_lock_irqsave(&dp->g_lock, flags);
+ if (head && ioband_group_find(head, id)) {
+ spin_unlock_irqrestore(&dp->g_lock, flags);
+ DMWARN("ioband_group: id=%d already exists.", id);
+ return -EEXIST;
+ }
+
+ list_add_tail(&gp->c_list, &dp->g_groups);
+
+ r = dp->g_group_ctr(gp, param);
+ if (r) {
+ list_del(&gp->c_list);
+ spin_unlock_irqrestore(&dp->g_lock, flags);
+ return r;
+ }
+
+ if (head) {
+ ioband_group_add_node(&head->c_group_root, gp);
+ gp->c_dev = head->c_dev;
+ gp->c_target = head->c_target;
+ }
+
+ spin_unlock_irqrestore(&dp->g_lock, flags);
+
+ return 0;
+}
+
+static void ioband_group_release(struct ioband_group *head,
+ struct ioband_group *gp)
+{
+ struct ioband_device *dp = gp->c_banddev;
+
+ list_del(&gp->c_list);
+ if (head)
+ rb_erase(&gp->c_group_node, &head->c_group_root);
+ dp->g_group_dtr(gp);
+ kfree(gp);
+}
+
+static void ioband_group_destroy_all(struct ioband_group *gp)
+{
+ struct ioband_device *dp = gp->c_banddev;
+ struct ioband_group *p;
+ unsigned long flags;
+
+ spin_lock_irqsave(&dp->g_lock, flags);
+ while ((p = ioband_group_find(gp, IOBAND_ID_ANY)))
+ ioband_group_release(gp, p);
+ ioband_group_release(NULL, gp);
+ spin_unlock_irqrestore(&dp->g_lock, flags);
+}
+
+static void ioband_group_stop_all(struct ioband_group *head, int suspend)
+{
+ struct ioband_device *dp = head->c_banddev;
+ struct ioband_group *p;
+ struct rb_node *node;
+ unsigned long flags;
+
+ spin_lock_irqsave(&dp->g_lock, flags);
+ for (node = rb_first(&head->c_group_root); node; node = rb_next(node)) {
+ p = rb_entry(node, struct ioband_group, c_group_node);
+ set_group_down(p);
+ if (suspend)
+ set_group_suspended(p);
+ }
+ set_group_down(head);
+ if (suspend)
+ set_group_suspended(head);
+ spin_unlock_irqrestore(&dp->g_lock, flags);
+ queue_delayed_work(dp->g_ioband_wq, &dp->g_conductor, 0);
+ flush_workqueue(dp->g_ioband_wq);
+}
+
+static void ioband_group_resume_all(struct ioband_group *head)
+{
+ struct ioband_device *dp = head->c_banddev;
+ struct ioband_group *p;
+ struct rb_node *node;
+ unsigned long flags;
+
+ spin_lock_irqsave(&dp->g_lock, flags);
+ for (node = rb_first(&head->c_group_root); node; node = rb_next(node)) {
+ p = rb_entry(node, struct ioband_group, c_group_node);
+ clear_group_down(p);
+ clear_group_suspended(p);
+ }
+ clear_group_down(head);
+ clear_group_suspended(head);
+ spin_unlock_irqrestore(&dp->g_lock, flags);
+}
+
+static int split_string(char *s, long *id, char **v)
+{
+ char *p, *q;
+ int r = 0;
+
+ *id = IOBAND_ID_ANY;
+ p = strsep(&s, POLICY_PARAM_DELIM);
+ q = strsep(&s, POLICY_PARAM_DELIM);
+ if (!q) {
+ *v = p;
+ } else {
+ r = strict_strtol(p, 0, id);
+ *v = q;
+ }
+ return r;
+}
+
+/*
+ * Create a new band device:
+ * parameters: <device> <device-group-id> <io_throttle> <io_limit>
+ * <type> <policy> <policy-param...> <group-id:group-param...>
+ */
+static int ioband_ctr(struct dm_target *ti, unsigned argc, char **argv)
+{
+ struct ioband_group *gp;
+ struct ioband_device *dp;
+ struct dm_dev *dev;
+ int io_throttle;
+ int io_limit;
+ int i, r, start;
+ long val, id;
+ char *param, *s;
+
+ if (argc < POLICY_PARAM_START) {
+ ti->error = "Requires " __stringify(POLICY_PARAM_START)
+ " or more arguments";
+ return -EINVAL;
+ }
+
+ if (strlen(argv[1]) > IOBAND_NAME_MAX) {
+ ti->error = "Ioband device name is too long";
+ return -EINVAL;
+ }
+
+ r = strict_strtol(argv[2], 0, &val);
+ if (r || val < 0 || val > SHORT_MAX) {
+ ti->error = "Invalid io_throttle";
+ return -EINVAL;
+ }
+ io_throttle = (val == 0) ? DEFAULT_IO_THROTTLE : val;
+
+ r = strict_strtol(argv[3], 0, &val);
+ if (r || val < 0 || val > SHORT_MAX) {
+ ti->error = "Invalid io_limit";
+ return -EINVAL;
+ }
+ io_limit = val;
+
+ r = dm_get_device(ti, argv[0], 0, ti->len,
+ dm_table_get_mode(ti->table), &dev);
+ if (r) {
+ ti->error = "Device lookup failed";
+ return r;
+ }
+
+ if (io_limit == 0) {
+ struct request_queue *q;
+
+ q = bdev_get_queue(dev->bdev);
+ if (!q) {
+ ti->error = "Can't get queue size";
+ r = -ENXIO;
+ goto release_dm_device;
+ }
+ io_limit = q->nr_requests;
+ }
+
+ if (io_limit < io_throttle)
+ io_limit = io_throttle;
+
+ dp = alloc_ioband_device(argv[1], io_throttle, io_limit);
+ if (!dp) {
+ ti->error = "Cannot create ioband device";
+ r = -EINVAL;
+ goto release_dm_device;
+ }
+
+ mutex_lock(&dp->g_lock_device);
+ r = policy_init(dp, argv[POLICY_PARAM_START - 1],
+ argc - POLICY_PARAM_START, &argv[POLICY_PARAM_START]);
+ if (r) {
+ ti->error = "Invalid policy parameter";
+ goto release_ioband_device;
+ }
+
+ gp = kzalloc(sizeof(struct ioband_group), GFP_KERNEL);
+ if (!gp) {
+ ti->error = "Cannot allocate memory for ioband group";
+ r = -ENOMEM;
+ goto release_ioband_device;
+ }
+
+ ti->private = gp;
+ gp->c_target = ti;
+ gp->c_dev = dev;
+
+ /* Find a default group parameter */
+ for (start = POLICY_PARAM_START; start < argc; start++) {
+ s = strpbrk(argv[start], POLICY_PARAM_DELIM);
+ if (s == argv[start])
+ break;
+ }
+ param = (start < argc) ? &argv[start][1] : NULL;
+
+ /* Create a default ioband group */
+ r = ioband_group_init(gp, NULL, dp, IOBAND_ID_ANY, param);
+ if (r) {
+ kfree(gp);
+ ti->error = "Cannot create default ioband group";
+ goto release_ioband_device;
+ }
+
+ r = ioband_group_type_select(gp, argv[4]);
+ if (r) {
+ ti->error = "Cannot set ioband group type";
+ goto release_ioband_group;
+ }
+
+ /* Create sub ioband groups */
+ for (i = start + 1; i < argc; i++) {
+ r = split_string(argv[i], &id, &param);
+ if (r) {
+ ti->error = "Invalid ioband group parameter";
+ goto release_ioband_group;
+ }
+ r = ioband_group_attach(gp, id, param);
+ if (r) {
+ ti->error = "Cannot create ioband group";
+ goto release_ioband_group;
+ }
+ }
+ mutex_unlock(&dp->g_lock_device);
+ return 0;
+
+release_ioband_group:
+ ioband_group_destroy_all(gp);
+release_ioband_device:
+ mutex_unlock(&dp->g_lock_device);
+ release_ioband_device(dp);
+release_dm_device:
+ dm_put_device(ti, dev);
+ return r;
+}
+
+static void ioband_dtr(struct dm_target *ti)
+{
+ struct ioband_group *gp = ti->private;
+ struct ioband_device *dp = gp->c_banddev;
+
+ mutex_lock(&dp->g_lock_device);
+ ioband_group_stop_all(gp, 0);
+ cancel_delayed_work_sync(&dp->g_conductor);
+ dm_put_device(ti, gp->c_dev);
+ ioband_group_destroy_all(gp);
+ mutex_unlock(&dp->g_lock_device);
+ release_ioband_device(dp);
+}
+
+static void ioband_hold_bio(struct ioband_group *gp, struct bio *bio)
+{
+ /* Todo: The list should be split into a read list and a write list */
+ bio_list_add(&gp->c_blocked_bios, bio);
+}
+
+static struct bio *ioband_pop_bio(struct ioband_group *gp)
+{
+ return bio_list_pop(&gp->c_blocked_bios);
+}
+
+static int is_urgent_bio(struct bio *bio)
+{
+ struct page *page = bio_iovec_idx(bio, 0)->bv_page;
+ /*
+ * ToDo: A new flag should be added to struct bio, which indicates
+ * it contains urgent I/O requests.
+ */
+ if (!PageReclaim(page))
+ return 0;
+ if (PageSwapCache(page))
+ return 2;
+ return 1;
+}
+
+static inline int device_should_block(struct ioband_group *gp)
+{
+ struct ioband_device *dp = gp->c_banddev;
+
+ if (is_group_down(gp))
+ return 0;
+ if (is_device_blocked(dp))
+ return 1;
+ if (dp->g_blocked >= dp->g_io_limit[READ] + dp->g_io_limit[WRITE]) {
+ set_device_blocked(dp);
+ return 1;
+ }
+ return 0;
+}
+
+static inline int group_should_block(struct ioband_group *gp)
+{
+ struct ioband_device *dp = gp->c_banddev;
+
+ if (is_group_down(gp))
+ return 0;
+ if (is_group_blocked(gp))
+ return 1;
+ if (dp->g_should_block(gp)) {
+ set_group_blocked(gp);
+ return 1;
+ }
+ return 0;
+}
+
+static void prevent_burst_bios(struct ioband_group *gp, struct bio *bio)
+{
+ struct ioband_device *dp = gp->c_banddev;
+
+ if (current->flags & PF_KTHREAD || is_urgent_bio(bio)) {
+ /*
+ * Kernel threads shouldn't be blocked easily since each of
+ * them may handle BIOs for several groups on several
+ * partitions.
+ */
+ wait_event_lock_irq(dp->g_waitq, !device_should_block(gp),
+ dp->g_lock, do_nothing());
+ } else {
+ wait_event_lock_irq(gp->c_waitq, !group_should_block(gp),
+ dp->g_lock, do_nothing());
+ }
+}
+
+static inline int should_pushback_bio(struct ioband_group *gp)
+{
+ return is_group_suspended(gp) && dm_noflush_suspending(gp->c_target);
+}
+
+static inline int prepare_to_issue(struct ioband_group *gp, struct bio *bio)
+{
+ struct ioband_device *dp = gp->c_banddev;
+
+ dp->g_issued[bio_data_dir(bio)]++;
+ return dp->g_prepare_bio(gp, bio, 0);
+}
+
+static inline int room_for_bio(struct ioband_device *dp)
+{
+ return dp->g_issued[READ] < dp->g_io_limit[READ]
+ || dp->g_issued[WRITE] < dp->g_io_limit[WRITE];
+}
+
+static void hold_bio(struct ioband_group *gp, struct bio *bio)
+{
+ struct ioband_device *dp = gp->c_banddev;
+
+ dp->g_blocked++;
+ if (is_urgent_bio(bio)) {
+ /*
+ * ToDo:
+ * When barrier mode is supported, write bios sharing the same
+ * file system with the currnt one would be all moved
+ * to g_urgent_bios list.
+ * You don't have to care about barrier handling if the bio
+ * is for swapping.
+ */
+ dp->g_prepare_bio(gp, bio, IOBAND_URGENT);
+ bio_list_add(&dp->g_urgent_bios, bio);
+ } else {
+ gp->c_blocked++;
+ dp->g_hold_bio(gp, bio);
+ }
+}
+
+static inline int room_for_bio_rw(struct ioband_device *dp, int direct)
+{
+ return dp->g_issued[direct] < dp->g_io_limit[direct];
+}
+
+static void push_prio_bio(struct ioband_group *gp, struct bio *bio, int direct)
+{
+ if (bio_list_empty(&gp->c_prio_bios))
+ set_prio_queue(gp, direct);
+ bio_list_add(&gp->c_prio_bios, bio);
+ gp->c_prio_blocked++;
+}
+
+static struct bio *pop_prio_bio(struct ioband_group *gp)
+{
+ struct bio *bio = bio_list_pop(&gp->c_prio_bios);
+
+ if (bio_list_empty(&gp->c_prio_bios))
+ clear_prio_queue(gp);
+
+ if (bio)
+ gp->c_prio_blocked--;
+ return bio;
+}
+
+static int make_issue_list(struct ioband_group *gp, struct bio *bio,
+ struct bio_list *issue_list,
+ struct bio_list *pushback_list)
+{
+ struct ioband_device *dp = gp->c_banddev;
+
+ dp->g_blocked--;
+ gp->c_blocked--;
+ if (!gp->c_blocked && is_group_blocked(gp)) {
+ clear_group_blocked(gp);
+ wake_up_all(&gp->c_waitq);
+ }
+ if (should_pushback_bio(gp))
+ bio_list_add(pushback_list, bio);
+ else {
+ int rw = bio_data_dir(bio);
+
+ gp->c_stat[rw].deferred++;
+ gp->c_stat[rw].sectors += bio_sectors(bio);
+ bio_list_add(issue_list, bio);
+ }
+ return prepare_to_issue(gp, bio);
+}
+
+static void release_urgent_bios(struct ioband_device *dp,
+ struct bio_list *issue_list,
+ struct bio_list *pushback_list)
+{
+ struct bio *bio;
+
+ if (bio_list_empty(&dp->g_urgent_bios))
+ return;
+ while (room_for_bio_rw(dp, WRITE)) {
+ bio = bio_list_pop(&dp->g_urgent_bios);
+ if (!bio)
+ return;
+ dp->g_blocked--;
+ dp->g_issued[bio_data_dir(bio)]++;
+ bio_list_add(issue_list, bio);
+ }
+}
+
+static int release_prio_bios(struct ioband_group *gp,
+ struct bio_list *issue_list,
+ struct bio_list *pushback_list)
+{
+ struct ioband_device *dp = gp->c_banddev;
+ struct bio *bio;
+ int direct;
+ int ret;
+
+ if (bio_list_empty(&gp->c_prio_bios))
+ return R_OK;
+ direct = prio_queue_direct(gp);
+ while (gp->c_prio_blocked) {
+ if (!dp->g_can_submit(gp))
+ return R_BLOCK;
+ if (!room_for_bio_rw(dp, direct))
+ return R_OK;
+ bio = pop_prio_bio(gp);
+ if (!bio)
+ return R_OK;
+ ret = make_issue_list(gp, bio, issue_list, pushback_list);
+ if (ret)
+ return ret;
+ }
+ return R_OK;
+}
+
+static int release_norm_bios(struct ioband_group *gp,
+ struct bio_list *issue_list,
+ struct bio_list *pushback_list)
+{
+ struct ioband_device *dp = gp->c_banddev;
+ struct bio *bio;
+ int direct;
+ int ret;
+
+ while (gp->c_blocked - gp->c_prio_blocked) {
+ if (!dp->g_can_submit(gp))
+ return R_BLOCK;
+ if (!room_for_bio(dp))
+ return R_OK;
+ bio = dp->g_pop_bio(gp);
+ if (!bio)
+ return R_OK;
+
+ direct = bio_data_dir(bio);
+ if (!room_for_bio_rw(dp, direct)) {
+ push_prio_bio(gp, bio, direct);
+ continue;
+ }
+ ret = make_issue_list(gp, bio, issue_list, pushback_list);
+ if (ret)
+ return ret;
+ }
+ return R_OK;
+}
+
+static inline int release_bios(struct ioband_group *gp,
+ struct bio_list *issue_list,
+ struct bio_list *pushback_list)
+{
+ int ret = release_prio_bios(gp, issue_list, pushback_list);
+ if (ret)
+ return ret;
+ return release_norm_bios(gp, issue_list, pushback_list);
+}
+
+static struct ioband_group *ioband_group_get(struct ioband_group *head,
+ struct bio *bio)
+{
+ struct ioband_group *gp;
+
+ if (!head->c_type->t_getid)
+ return head;
+
+ gp = ioband_group_find(head, head->c_type->t_getid(bio));
+
+ if (!gp)
+ gp = head;
+ return gp;
+}
+
+/*
+ * Start to control the bandwidth once the number of uncompleted BIOs
+ * exceeds the value of "io_throttle".
+ */
+static int ioband_map(struct dm_target *ti, struct bio *bio,
+ union map_info *map_context)
+{
+ struct ioband_group *gp = ti->private;
+ struct ioband_device *dp = gp->c_banddev;
+ unsigned long flags;
+ int direct;
+
+ spin_lock_irqsave(&dp->g_lock, flags);
+
+ /*
+ * The device is suspended while some of the ioband device
+ * configurations are being changed.
+ */
+ if (is_device_suspended(dp))
+ wait_event_lock_irq(dp->g_waitq_suspend,
+ !is_device_suspended(dp), dp->g_lock,
+ do_nothing());
+
+ gp = ioband_group_get(gp, bio);
+ prevent_burst_bios(gp, bio);
+ if (should_pushback_bio(gp)) {
+ spin_unlock_irqrestore(&dp->g_lock, flags);
+ return DM_MAPIO_REQUEUE;
+ }
+
+ bio->bi_bdev = gp->c_dev->bdev;
+ bio->bi_sector -= ti->begin;
+ direct = bio_data_dir(bio);
+
+ if (!gp->c_blocked && room_for_bio_rw(dp, direct)) {
+ if (dp->g_can_submit(gp)) {
+ prepare_to_issue(gp, bio);
+ gp->c_stat[direct].immediate++;
+ gp->c_stat[direct].sectors += bio_sectors(bio);
+ spin_unlock_irqrestore(&dp->g_lock, flags);
+ return DM_MAPIO_REMAPPED;
+ } else if (!dp->g_blocked &&
+ dp->g_issued[READ] + dp->g_issued[WRITE] == 0) {
+ DMDEBUG("%s: token expired gp:%p", __func__, gp);
+ queue_delayed_work(dp->g_ioband_wq,
+ &dp->g_conductor, 1);
+ }
+ }
+ hold_bio(gp, bio);
+ spin_unlock_irqrestore(&dp->g_lock, flags);
+
+ return DM_MAPIO_SUBMITTED;
+}
+
+/*
+ * Select the best group to resubmit its BIOs.
+ */
+static struct ioband_group *choose_best_group(struct ioband_device *dp)
+{
+ struct ioband_group *gp;
+ struct ioband_group *best = NULL;
+ int highest = 0;
+ int pri;
+
+ /* Todo: The algorithm should be optimized.
+ * It would be better to use rbtree.
+ */
+ list_for_each_entry(gp, &dp->g_groups, c_list) {
+ if (!gp->c_blocked || !room_for_bio(dp))
+ continue;
+ if (gp->c_blocked == gp->c_prio_blocked &&
+ !room_for_bio_rw(dp, prio_queue_direct(gp))) {
+ continue;
+ }
+ pri = dp->g_can_submit(gp);
+ if (pri > highest) {
+ highest = pri;
+ best = gp;
+ }
+ }
+
+ return best;
+}
+
+/*
+ * This function is called right after it becomes able to resubmit BIOs.
+ * It selects the best BIOs and passes them to the underlying layer.
+ */
+static void ioband_conduct(struct work_struct *work)
+{
+ struct ioband_device *dp =
+ container_of(work, struct ioband_device, g_conductor.work);
+ struct ioband_group *gp = NULL;
+ struct bio *bio;
+ unsigned long flags;
+ struct bio_list issue_list, pushback_list;
+
+ bio_list_init(&issue_list);
+ bio_list_init(&pushback_list);
+
+ spin_lock_irqsave(&dp->g_lock, flags);
+ release_urgent_bios(dp, &issue_list, &pushback_list);
+ if (dp->g_blocked) {
+ gp = choose_best_group(dp);
+ if (gp &&
+ release_bios(gp, &issue_list, &pushback_list) == R_YIELD)
+ queue_delayed_work(dp->g_ioband_wq,
+ &dp->g_conductor, 0);
+ }
+
+ if (is_device_blocked(dp) &&
+ dp->g_blocked < dp->g_io_limit[READ] + dp->g_io_limit[WRITE]) {
+ clear_device_blocked(dp);
+ wake_up_all(&dp->g_waitq);
+ }
+
+ if (dp->g_blocked &&
+ room_for_bio_rw(dp, READ) && room_for_bio_rw(dp, WRITE) &&
+ bio_list_empty(&issue_list) && bio_list_empty(&pushback_list) &&
+ dp->g_restart_bios(dp)) {
+ DMDEBUG("%s: token expired dp:%p issued(%d,%d) g_blocked(%d)",
+ __func__, dp, dp->g_issued[READ], dp->g_issued[WRITE],
+ dp->g_blocked);
+ queue_delayed_work(dp->g_ioband_wq, &dp->g_conductor, 0);
+ }
+
+ spin_unlock_irqrestore(&dp->g_lock, flags);
+
+ while ((bio = bio_list_pop(&issue_list)))
+ generic_make_request(bio);
+ while ((bio = bio_list_pop(&pushback_list)))
+ bio_endio(bio, -EIO);
+}
+
+static int ioband_end_io(struct dm_target *ti, struct bio *bio,
+ int error, union map_info *map_context)
+{
+ struct ioband_group *gp = ti->private;
+ struct ioband_device *dp = gp->c_banddev;
+ unsigned long flags;
+ int r = error;
+
+ /*
+ * XXX: A new error code for device mapper devices should be used
+ * rather than EIO.
+ */
+ if (error == -EIO && should_pushback_bio(gp)) {
+ /* This ioband device is suspending */
+ r = DM_ENDIO_REQUEUE;
+ }
+ /*
+ * Todo: The algorithm should be optimized to eliminate the spinlock.
+ */
+ spin_lock_irqsave(&dp->g_lock, flags);
+ dp->g_issued[bio_data_dir(bio)]--;
+
+ /*
+ * Todo: It would be better to introduce high/low water marks here
+ * not to kick the workqueues so often.
+ */
+ if (dp->g_blocked)
+ queue_delayed_work(dp->g_ioband_wq, &dp->g_conductor, 0);
+ else if (is_device_suspended(dp) &&
+ dp->g_issued[READ] + dp->g_issued[WRITE] == 0)
+ wake_up_all(&dp->g_waitq_flush);
+ spin_unlock_irqrestore(&dp->g_lock, flags);
+ return r;
+}
+
+static void ioband_presuspend(struct dm_target *ti)
+{
+ struct ioband_group *gp = ti->private;
+ struct ioband_device *dp = gp->c_banddev;
+
+ mutex_lock(&dp->g_lock_device);
+ ioband_group_stop_all(gp, 1);
+ mutex_unlock(&dp->g_lock_device);
+}
+
+static void ioband_resume(struct dm_target *ti)
+{
+ struct ioband_group *gp = ti->private;
+ struct ioband_device *dp = gp->c_banddev;
+
+ mutex_lock(&dp->g_lock_device);
+ ioband_group_resume_all(gp);
+ mutex_unlock(&dp->g_lock_device);
+}
+
+static void ioband_group_status(struct ioband_group *gp, int *szp,
+ char *result, unsigned maxlen)
+{
+ struct ioband_group_stat *stat;
+ int i, sz = *szp; /* used in DMEMIT() */
+
+ DMEMIT(" %d", gp->c_id);
+ for (i = 0; i < 2; i++) {
+ stat = &gp->c_stat[i];
+ DMEMIT(" %lu %lu %lu",
+ stat->immediate + stat->deferred, stat->deferred,
+ stat->sectors);
+ }
+ *szp = sz;
+}
+
+static int ioband_status(struct dm_target *ti, status_type_t type,
+ char *result, unsigned maxlen)
+{
+ struct ioband_group *gp = ti->private, *p;
+ struct ioband_device *dp = gp->c_banddev;
+ struct rb_node *node;
+ int sz = 0; /* used in DMEMIT() */
+ unsigned long flags;
+
+ mutex_lock(&dp->g_lock_device);
+
+ switch (type) {
+ case STATUSTYPE_INFO:
+ spin_lock_irqsave(&dp->g_lock, flags);
+ DMEMIT("%s", dp->g_name);
+ ioband_group_status(gp, &sz, result, maxlen);
+ for (node = rb_first(&gp->c_group_root); node;
+ node = rb_next(node)) {
+ p = rb_entry(node, struct ioband_group, c_group_node);
+ ioband_group_status(p, &sz, result, maxlen);
+ }
+ spin_unlock_irqrestore(&dp->g_lock, flags);
+ break;
+
+ case STATUSTYPE_TABLE:
+ spin_lock_irqsave(&dp->g_lock, flags);
+ DMEMIT("%s %s %d %d %s %s",
+ gp->c_dev->name, dp->g_name,
+ dp->g_io_throttle, dp->g_io_limit[READ],
+ gp->c_type->t_name, dp->g_policy->p_name);
+ dp->g_show(gp, &sz, result, maxlen);
+ spin_unlock_irqrestore(&dp->g_lock, flags);
+ break;
+ }
+
+ mutex_unlock(&dp->g_lock_device);
+ return 0;
+}
+
+static int ioband_group_type_select(struct ioband_group *gp, char *name)
+{
+ struct ioband_device *dp = gp->c_banddev;
+ struct group_type *t;
+ unsigned long flags;
+
+ for (t = dm_ioband_group_type; (t->t_name); t++) {
+ if (!strcmp(name, t->t_name))
+ break;
+ }
+ if (!t->t_name) {
+ DMWARN("ioband type select: %s isn't supported.", name);
+ return -EINVAL;
+ }
+ spin_lock_irqsave(&dp->g_lock, flags);
+ if (!RB_EMPTY_ROOT(&gp->c_group_root)) {
+ spin_unlock_irqrestore(&dp->g_lock, flags);
+ return -EBUSY;
+ }
+ gp->c_type = t;
+ spin_unlock_irqrestore(&dp->g_lock, flags);
+
+ return 0;
+}
+
+static int ioband_set_param(struct ioband_group *gp, char *cmd, char *value)
+{
+ struct ioband_device *dp = gp->c_banddev;
+ char *val_str;
+ long id;
+ unsigned long flags;
+ int r;
+
+ r = split_string(value, &id, &val_str);
+ if (r)
+ return r;
+
+ spin_lock_irqsave(&dp->g_lock, flags);
+ if (id != IOBAND_ID_ANY) {
+ gp = ioband_group_find(gp, id);
+ if (!gp) {
+ spin_unlock_irqrestore(&dp->g_lock, flags);
+ DMWARN("ioband_set_param: id=%ld not found.", id);
+ return -EINVAL;
+ }
+ }
+ r = dp->g_set_param(gp, cmd, val_str);
+ spin_unlock_irqrestore(&dp->g_lock, flags);
+ return r;
+}
+
+static int ioband_group_attach(struct ioband_group *gp, int id, char *param)
+{
+ struct ioband_device *dp = gp->c_banddev;
+ struct ioband_group *sub_gp;
+ int r;
+
+ if (id < 0) {
+ DMWARN("ioband_group_attach: invalid id:%d", id);
+ return -EINVAL;
+ }
+ if (!gp->c_type->t_getid) {
+ DMWARN("ioband_group_attach: "
+ "no ioband group type is specified");
+ return -EINVAL;
+ }
+
+ sub_gp = kzalloc(sizeof(struct ioband_group), GFP_KERNEL);
+ if (!sub_gp)
+ return -ENOMEM;
+
+ r = ioband_group_init(sub_gp, gp, dp, id, param);
+ if (r < 0) {
+ kfree(sub_gp);
+ return r;
+ }
+ return 0;
+}
+
+static int ioband_group_detach(struct ioband_group *gp, int id)
+{
+ struct ioband_device *dp = gp->c_banddev;
+ struct ioband_group *sub_gp;
+ unsigned long flags;
+
+ if (id < 0) {
+ DMWARN("ioband_group_detach: invalid id:%d", id);
+ return -EINVAL;
+ }
+ spin_lock_irqsave(&dp->g_lock, flags);
+ sub_gp = ioband_group_find(gp, id);
+ if (!sub_gp) {
+ spin_unlock_irqrestore(&dp->g_lock, flags);
+ DMWARN("ioband_group_detach: invalid id:%d", id);
+ return -EINVAL;
+ }
+
+ /*
+ * Todo: Calling suspend_ioband_device() before releasing the
+ * ioband group has a large overhead. Need improvement.
+ */
+ suspend_ioband_device(dp, flags, 0);
+ ioband_group_release(gp, sub_gp);
+ resume_ioband_device(dp);
+ spin_unlock_irqrestore(&dp->g_lock, flags);
+ return 0;
+}
+
+/*
+ * Message parameters:
+ * "policy" <name>
+ * ex)
+ * "policy" "weight"
+ * "type" "none"|"pid"|"pgrp"|"node"|"cpuset"|"cgroup"|"user"|"gid"
+ * "io_throttle" <value>
+ * "io_limit" <value>
+ * "attach" <group id>
+ * "detach" <group id>
+ * "any-command" <group id>:<value>
+ * ex)
+ * "weight" 0:<value>
+ * "token" 24:<value>
+ */
+static int __ioband_message(struct dm_target *ti, unsigned argc, char **argv)
+{
+ struct ioband_group *gp = ti->private, *p;
+ struct ioband_device *dp = gp->c_banddev;
+ struct rb_node *node;
+ long val;
+ int r = 0;
+ unsigned long flags;
+
+ if (argc == 1 && !strcmp(argv[0], "reset")) {
+ spin_lock_irqsave(&dp->g_lock, flags);
+ memset(gp->c_stat, 0, sizeof(gp->c_stat));
+ for (node = rb_first(&gp->c_group_root); node;
+ node = rb_next(node)) {
+ p = rb_entry(node, struct ioband_group, c_group_node);
+ memset(p->c_stat, 0, sizeof(p->c_stat));
+ }
+ spin_unlock_irqrestore(&dp->g_lock, flags);
+ return 0;
+ }
+
+ if (argc != 2) {
+ DMWARN("Unrecognised band message received.");
+ return -EINVAL;
+ }
+ if (!strcmp(argv[0], "io_throttle")) {
+ r = strict_strtol(argv[1], 0, &val);
+ if (r || val < 0 || val > SHORT_MAX)
+ return -EINVAL;
+ if (val == 0)
+ val = DEFAULT_IO_THROTTLE;
+ spin_lock_irqsave(&dp->g_lock, flags);
+ if (val > dp->g_io_limit[READ] ||
+ val > dp->g_io_limit[WRITE]) {
+ spin_unlock_irqrestore(&dp->g_lock, flags);
+ return -EINVAL;
+ }
+ dp->g_io_throttle = val;
+ spin_unlock_irqrestore(&dp->g_lock, flags);
+ ioband_set_param(gp, argv[0], argv[1]);
+ return 0;
+ } else if (!strcmp(argv[0], "io_limit")) {
+ r = strict_strtol(argv[1], 0, &val);
+ if (r || val < 0 || val > SHORT_MAX)
+ return -EINVAL;
+ spin_lock_irqsave(&dp->g_lock, flags);
+ if (val == 0) {
+ struct request_queue *q;
+
+ q = bdev_get_queue(gp->c_dev->bdev);
+ if (!q) {
+ spin_unlock_irqrestore(&dp->g_lock, flags);
+ return -ENXIO;
+ }
+ val = q->nr_requests;
+ }
+ if (val < dp->g_io_throttle) {
+ spin_unlock_irqrestore(&dp->g_lock, flags);
+ return -EINVAL;
+ }
+ dp->g_io_limit[READ] = dp->g_io_limit[WRITE] = val;
+ spin_unlock_irqrestore(&dp->g_lock, flags);
+ ioband_set_param(gp, argv[0], argv[1]);
+ return 0;
+ } else if (!strcmp(argv[0], "type")) {
+ return ioband_group_type_select(gp, argv[1]);
+ } else if (!strcmp(argv[0], "attach")) {
+ r = strict_strtol(argv[1], 0, &val);
+ if (r)
+ return r;
+ return ioband_group_attach(gp, val, NULL);
+ } else if (!strcmp(argv[0], "detach")) {
+ r = strict_strtol(argv[1], 0, &val);
+ if (r)
+ return r;
+ return ioband_group_detach(gp, val);
+ } else if (!strcmp(argv[0], "policy")) {
+ r = policy_init(dp, argv[1], 0, &argv[2]);
+ return r;
+ } else {
+ /* message anycommand <group-id>:<value> */
+ r = ioband_set_param(gp, argv[0], argv[1]);
+ if (r < 0)
+ DMWARN("Unrecognised band message received.");
+ return r;
+ }
+ return 0;
+}
+
+static int ioband_message(struct dm_target *ti, unsigned argc, char **argv)
+{
+ struct ioband_group *gp = ti->private;
+ struct ioband_device *dp = gp->c_banddev;
+ int r;
+
+ mutex_lock(&dp->g_lock_device);
+ r = __ioband_message(ti, argc, argv);
+ mutex_unlock(&dp->g_lock_device);
+ return r;
+}
+
+static int ioband_merge(struct dm_target *ti, struct bvec_merge_data *bvm,
+ struct bio_vec *biovec, int max_size)
+{
+ struct ioband_group *gp = ti->private;
+ struct request_queue *q = bdev_get_queue(gp->c_dev->bdev);
+
+ if (!q->merge_bvec_fn)
+ return max_size;
+
+ bvm->bi_bdev = gp->c_dev->bdev;
+ bvm->bi_sector -= ti->begin;
+
+ return min(max_size, q->merge_bvec_fn(q, bvm, biovec));
+}
+
+static struct target_type ioband_target = {
+ .name = "ioband",
+ .module = THIS_MODULE,
+ .version = {1, 10, 4},
+ .ctr = ioband_ctr,
+ .dtr = ioband_dtr,
+ .map = ioband_map,
+ .end_io = ioband_end_io,
+ .presuspend = ioband_presuspend,
+ .resume = ioband_resume,
+ .status = ioband_status,
+ .message = ioband_message,
+ .merge = ioband_merge,
+};
+
+static int __init dm_ioband_init(void)
+{
+ int r;
+
+ r = dm_register_target(&ioband_target);
+ if (r < 0) {
+ DMERR("register failed %d", r);
+ return r;
+ }
+ return r;
+}
+
+static void __exit dm_ioband_exit(void)
+{
+ dm_unregister_target(&ioband_target);
+}
+
+module_init(dm_ioband_init);
+module_exit(dm_ioband_exit);
+
+MODULE_DESCRIPTION(DM_NAME " I/O bandwidth control");
+MODULE_AUTHOR("Hirokazu Takahashi <taka@valinux.co.jp>, "
+ "Ryo Tsuruta <ryov@valinux.co.jp");
+MODULE_LICENSE("GPL");
Index: linux-2.6.30-rc1/drivers/md/dm-ioband-policy.c
===================================================================
--- /dev/null
+++ linux-2.6.30-rc1/drivers/md/dm-ioband-policy.c
@@ -0,0 +1,456 @@
+/*
+ * Copyright (C) 2008 VA Linux Systems Japan K.K.
+ *
+ * I/O bandwidth control
+ *
+ * This file is released under the GPL.
+ */
+#include <linux/bio.h>
+#include <linux/workqueue.h>
+#include <linux/rbtree.h>
+#include "dm.h"
+#include "dm-ioband.h"
+
+/*
+ * The following functions determine when and which BIOs should
+ * be submitted to control the I/O flow.
+ * It is possible to add a new BIO scheduling policy with it.
+ */
+
+/*
+ * Functions for weight balancing policy based on the number of I/Os.
+ */
+#define DEFAULT_WEIGHT 100
+#define DEFAULT_TOKENPOOL 2048
+#define DEFAULT_BUCKET 2
+#define IOBAND_IOPRIO_BASE 100
+#define TOKEN_BATCH_UNIT 20
+#define PROCEED_THRESHOLD 8
+#define LOCAL_ACTIVE_RATIO 8
+#define GLOBAL_ACTIVE_RATIO 16
+#define OVERCOMMIT_RATE 4
+
+/*
+ * Calculate the effective number of tokens this group has.
+ */
+static int get_token(struct ioband_group *gp)
+{
+ struct ioband_device *dp = gp->c_banddev;
+ int token = gp->c_token;
+ int allowance = dp->g_epoch - gp->c_my_epoch;
+
+ if (allowance) {
+ if (allowance > dp->g_carryover)
+ allowance = dp->g_carryover;
+ token += gp->c_token_initial * allowance;
+ }
+ if (is_group_down(gp))
+ token += gp->c_token_initial * dp->g_carryover * 2;
+
+ return token;
+}
+
+/*
+ * Calculate the priority of a given group.
+ */
+static int iopriority(struct ioband_group *gp)
+{
+ return get_token(gp) * IOBAND_IOPRIO_BASE / gp->c_token_initial + 1;
+}
+
+/*
+ * This function is called when all the active group on the same ioband
+ * device has used up their tokens. It makes a new global epoch so that
+ * all groups on this device will get freshly assigned tokens.
+ */
+static int make_global_epoch(struct ioband_device *dp)
+{
+ struct ioband_group *gp = dp->g_dominant;
+
+ /*
+ * Don't make a new epoch if the dominant group still has a lot of
+ * tokens, except when the I/O load is low.
+ */
+ if (gp) {
+ int iopri = iopriority(gp);
+ if (iopri * PROCEED_THRESHOLD > IOBAND_IOPRIO_BASE &&
+ dp->g_issued[READ] + dp->g_issued[WRITE] >=
+ dp->g_io_throttle)
+ return 0;
+ }
+
+ dp->g_epoch++;
+ DMDEBUG("make_epoch %d", dp->g_epoch);
+
+ /* The leftover tokens will be used in the next epoch. */
+ dp->g_token_extra = dp->g_token_left;
+ if (dp->g_token_extra < 0)
+ dp->g_token_extra = 0;
+ dp->g_token_left = dp->g_token_bucket;
+
+ dp->g_expired = NULL;
+ dp->g_dominant = NULL;
+
+ return 1;
+}
+
+/*
+ * This function is called when this group has used up its own tokens.
+ * It will check whether it's possible to make a new epoch of this group.
+ */
+static inline int make_epoch(struct ioband_group *gp)
+{
+ struct ioband_device *dp = gp->c_banddev;
+ int allowance = dp->g_epoch - gp->c_my_epoch;
+
+ if (!allowance)
+ return 0;
+ if (allowance > dp->g_carryover)
+ allowance = dp->g_carryover;
+ gp->c_my_epoch = dp->g_epoch;
+ return allowance;
+}
+
+/*
+ * Check whether this group has tokens to issue an I/O. Return 0 if it
+ * doesn't have any, otherwise return the priority of this group.
+ */
+static int is_token_left(struct ioband_group *gp)
+{
+ struct ioband_device *dp = gp->c_banddev;
+ int allowance;
+ int delta;
+ int extra;
+
+ if (gp->c_token > 0)
+ return iopriority(gp);
+
+ if (is_group_down(gp)) {
+ gp->c_token = gp->c_token_initial;
+ return iopriority(gp);
+ }
+ allowance = make_epoch(gp);
+ if (!allowance)
+ return 0;
+ /*
+ * If this group has the right to get tokens for several epochs,
+ * give all of them to the group here.
+ */
+ delta = gp->c_token_initial * allowance;
+ dp->g_token_left -= delta;
+ /*
+ * Give some extra tokens to this group when there have left unused
+ * tokens on this ioband device from the previous epoch.
+ */
+ extra = dp->g_token_extra * gp->c_token_initial /
+ (dp->g_token_bucket - dp->g_token_extra / 2);
+ delta += extra;
+ gp->c_token += delta;
+ gp->c_consumed = 0;
+
+ if (gp == dp->g_current)
+ dp->g_yield_mark += delta;
+ DMDEBUG("refill token: gp:%p token:%d->%d extra(%d) allowance(%d)",
+ gp, gp->c_token - delta, gp->c_token, extra, allowance);
+ if (gp->c_token > 0)
+ return iopriority(gp);
+ DMDEBUG("refill token: yet empty gp:%p token:%d", gp, gp->c_token);
+ return 0;
+}
+
+/*
+ * Use tokens to issue an I/O. After the operation, the number of tokens left
+ * on this group may become negative value, which will be treated as debt.
+ */
+static int consume_token(struct ioband_group *gp, int count, int flag)
+{
+ struct ioband_device *dp = gp->c_banddev;
+
+ if (gp->c_consumed * LOCAL_ACTIVE_RATIO < gp->c_token_initial &&
+ gp->c_consumed * GLOBAL_ACTIVE_RATIO < dp->g_token_bucket) {
+ ; /* Do nothing unless this group is really active. */
+ } else if (!dp->g_dominant ||
+ get_token(gp) > get_token(dp->g_dominant)) {
+ /*
+ * Regard this group as the dominant group on this
+ * ioband device when it has larger number of tokens
+ * than those of the previous one.
+ */
+ dp->g_dominant = gp;
+ }
+ if (dp->g_epoch == gp->c_my_epoch &&
+ gp->c_token > 0 && gp->c_token - count <= 0) {
+ /* Remember the last group which used up its own tokens. */
+ dp->g_expired = gp;
+ if (dp->g_dominant == gp)
+ dp->g_dominant = NULL;
+ }
+
+ if (gp != dp->g_current) {
+ /* This group is the current already. */
+ dp->g_current = gp;
+ dp->g_yield_mark =
+ gp->c_token - (TOKEN_BATCH_UNIT << dp->g_token_unit);
+ }
+ gp->c_token -= count;
+ gp->c_consumed += count;
+ if (gp->c_token <= dp->g_yield_mark && !(flag & IOBAND_URGENT)) {
+ /*
+ * Return-value 1 means that this policy requests dm-ioband
+ * to give a chance to another group to be selected since
+ * this group has already issued enough amount of I/Os.
+ */
+ dp->g_current = NULL;
+ return R_YIELD;
+ }
+ /*
+ * Return-value 0 means that this policy allows dm-ioband to select
+ * this group to issue I/Os without a break.
+ */
+ return R_OK;
+}
+
+/*
+ * Consume one token on each I/O.
+ */
+static int prepare_token(struct ioband_group *gp, struct bio *bio, int flag)
+{
+ return consume_token(gp, 1, flag);
+}
+
+/*
+ * Check if this group is able to receive a new bio.
+ */
+static int is_queue_full(struct ioband_group *gp)
+{
+ return gp->c_blocked >= gp->c_limit;
+}
+
+static void set_weight(struct ioband_group *gp, int new)
+{
+ struct ioband_device *dp = gp->c_banddev;
+ struct ioband_group *p;
+
+ dp->g_weight_total += (new - gp->c_weight);
+ gp->c_weight = new;
+
+ if (dp->g_weight_total == 0) {
+ list_for_each_entry(p, &dp->g_groups, c_list)
+ p->c_token = p->c_token_initial = p->c_limit = 1;
+ } else {
+ list_for_each_entry(p, &dp->g_groups, c_list) {
+ p->c_token = p->c_token_initial =
+ dp->g_token_bucket * p->c_weight /
+ dp->g_weight_total + 1;
+ p->c_limit = (dp->g_io_limit[READ] +
+ dp->g_io_limit[WRITE]) * p->c_weight /
+ dp->g_weight_total / OVERCOMMIT_RATE + 1;
+ }
+ }
+}
+
+static void init_token_bucket(struct ioband_device *dp,
+ int token_bucket, int carryover)
+{
+ if (!token_bucket)
+ dp->g_token_bucket =
+ ((dp->g_io_limit[READ] + dp->g_io_limit[WRITE]) *
+ DEFAULT_BUCKET) << dp->g_token_unit;
+ else
+ dp->g_token_bucket = token_bucket;
+ if (!carryover)
+ dp->g_carryover = (DEFAULT_TOKENPOOL << dp->g_token_unit) /
+ dp->g_token_bucket;
+ else
+ dp->g_carryover = carryover;
+ if (dp->g_carryover < 1)
+ dp->g_carryover = 1;
+ dp->g_token_left = 0;
+}
+
+static int policy_weight_param(struct ioband_group *gp, char *cmd, char *value)
+{
+ struct ioband_device *dp = gp->c_banddev;
+ long val;
+ int r = 0, err;
+
+ err = strict_strtol(value, 0, &val);
+ if (!strcmp(cmd, "weight")) {
+ if (!err && 0 < val && val <= SHORT_MAX)
+ set_weight(gp, val);
+ else
+ r = -EINVAL;
+ } else if (!strcmp(cmd, "token")) {
+ if (!err && 0 <= val && val <= INT_MAX) {
+ init_token_bucket(dp, val, 0);
+ set_weight(gp, gp->c_weight);
+ dp->g_token_extra = 0;
+ } else
+ r = -EINVAL;
+ } else if (!strcmp(cmd, "carryover")) {
+ if (!err && 0 <= val && val <= INT_MAX) {
+ init_token_bucket(dp, dp->g_token_bucket, val);
+ set_weight(gp, gp->c_weight);
+ dp->g_token_extra = 0;
+ } else
+ r = -EINVAL;
+ } else if (!strcmp(cmd, "io_limit")) {
+ init_token_bucket(dp, 0, 0);
+ set_weight(gp, gp->c_weight);
+ } else {
+ r = -EINVAL;
+ }
+ return r;
+}
+
+static int policy_weight_ctr(struct ioband_group *gp, char *arg)
+{
+ struct ioband_device *dp = gp->c_banddev;
+
+ if (!arg)
+ arg = __stringify(DEFAULT_WEIGHT);
+ gp->c_my_epoch = dp->g_epoch;
+ gp->c_weight = 0;
+ gp->c_consumed = 0;
+ return policy_weight_param(gp, "weight", arg);
+}
+
+static void policy_weight_dtr(struct ioband_group *gp)
+{
+ struct ioband_device *dp = gp->c_banddev;
+ set_weight(gp, 0);
+ dp->g_dominant = NULL;
+ dp->g_expired = NULL;
+}
+
+static void policy_weight_show(struct ioband_group *gp, int *szp,
+ char *result, unsigned maxlen)
+{
+ struct ioband_group *p;
+ struct ioband_device *dp = gp->c_banddev;
+ struct rb_node *node;
+ int sz = *szp; /* used in DMEMIT() */
+
+ DMEMIT(" %d :%d", dp->g_token_bucket, gp->c_weight);
+
+ for (node = rb_first(&gp->c_group_root); node; node = rb_next(node)) {
+ p = rb_entry(node, struct ioband_group, c_group_node);
+ DMEMIT(" %d:%d", p->c_id, p->c_weight);
+ }
+ *szp = sz;
+}
+
+/*
+ * <Method> <description>
+ * g_can_submit : To determine whether a given group has the right to
+ * submit BIOs. The larger the return value the higher the
+ * priority to submit. Zero means it has no right.
+ * g_prepare_bio : Called right before submitting each BIO.
+ * g_restart_bios : Called if this ioband device has some BIOs blocked but none
+ * of them can be submitted now. This method has to
+ * reinitialize the data to restart to submit BIOs and return
+ * 0 or 1.
+ * The return value 0 means that it has become able to submit
+ * them now so that this ioband device will continue its work.
+ * The return value 1 means that it is still unable to submit
+ * them so that this device will stop its work. And this
+ * policy module has to reactivate the device when it gets
+ * to be able to submit BIOs.
+ * g_hold_bio : To hold a given BIO until it is submitted.
+ * The default function is used when this method is undefined.
+ * g_pop_bio : To select and get the best BIO to submit.
+ * g_group_ctr : To initalize the policy own members of struct ioband_group.
+ * g_group_dtr : Called when struct ioband_group is removed.
+ * g_set_param : To update the policy own date.
+ * The parameters can be passed through "dmsetup message"
+ * command.
+ * g_should_block : Called every time this ioband device receive a BIO.
+ * Return 1 if a given group can't receive any more BIOs,
+ * otherwise return 0.
+ * g_show : Show the configuration.
+ */
+static int policy_weight_init(struct ioband_device *dp, int argc, char **argv)
+{
+ long val;
+ int r = 0;
+
+ if (argc < 1)
+ val = 0;
+ else {
+ r = strict_strtol(argv[0], 0, &val);
+ if (r || val < 0 || val > INT_MAX)
+ return -EINVAL;
+ }
+
+ dp->g_can_submit = is_token_left;
+ dp->g_prepare_bio = prepare_token;
+ dp->g_restart_bios = make_global_epoch;
+ dp->g_group_ctr = policy_weight_ctr;
+ dp->g_group_dtr = policy_weight_dtr;
+ dp->g_set_param = policy_weight_param;
+ dp->g_should_block = is_queue_full;
+ dp->g_show = policy_weight_show;
+
+ dp->g_epoch = 0;
+ dp->g_weight_total = 0;
+ dp->g_current = NULL;
+ dp->g_dominant = NULL;
+ dp->g_expired = NULL;
+ dp->g_token_extra = 0;
+ dp->g_token_unit = 0;
+ init_token_bucket(dp, val, 0);
+ dp->g_token_left = dp->g_token_bucket;
+
+ return 0;
+}
+
+/* weight balancing policy based on the number of I/Os. --- End --- */
+
+/*
+ * Functions for weight balancing policy based on I/O size.
+ * It just borrows a lot of functions from the regular weight balancing policy.
+ */
+static int w2_prepare_token(struct ioband_group *gp, struct bio *bio, int flag)
+{
+ /* Consume tokens depending on the size of a given bio. */
+ return consume_token(gp, bio_sectors(bio), flag);
+}
+
+static int w2_policy_weight_init(struct ioband_device *dp,
+ int argc, char **argv)
+{
+ long val;
+ int r = 0;
+
+ if (argc < 1)
+ val = 0;
+ else {
+ r = strict_strtol(argv[0], 0, &val);
+ if (r || val < 0 || val > INT_MAX)
+ return -EINVAL;
+ }
+
+ r = policy_weight_init(dp, argc, argv);
+ if (r < 0)
+ return r;
+
+ dp->g_prepare_bio = w2_prepare_token;
+ dp->g_token_unit = PAGE_SHIFT - 9;
+ init_token_bucket(dp, val, 0);
+ dp->g_token_left = dp->g_token_bucket;
+ return 0;
+}
+
+/* weight balancing policy based on I/O size. --- End --- */
+
+static int policy_default_init(struct ioband_device *dp, int argc, char **argv)
+{
+ return policy_weight_init(dp, argc, argv);
+}
+
+struct policy_type dm_ioband_policy_type[] = {
+ {"default", policy_default_init},
+ {"weight", policy_weight_init},
+ {"weight-iosize", w2_policy_weight_init},
+ {NULL, policy_default_init}
+};
Index: linux-2.6.30-rc1/drivers/md/dm-ioband-type.c
===================================================================
--- /dev/null
+++ linux-2.6.30-rc1/drivers/md/dm-ioband-type.c
@@ -0,0 +1,76 @@
+/*
+ * Copyright (C) 2008 VA Linux Systems Japan K.K.
+ *
+ * I/O bandwidth control
+ *
+ * This file is released under the GPL.
+ */
+#include <linux/bio.h>
+#include "dm.h"
+#include "dm-ioband.h"
+
+/*
+ * Any I/O bandwidth can be divided into several bandwidth groups, each of which
+ * has its own unique ID. The following functions are called to determine
+ * which group a given BIO belongs to and return the ID of the group.
+ */
+
+/* ToDo: unsigned long value would be better for group ID */
+
+static int ioband_process_id(struct bio *bio)
+{
+ /*
+ * This function will work for KVM and Xen.
+ */
+ return (int)current->tgid;
+}
+
+static int ioband_process_group(struct bio *bio)
+{
+ return (int)task_pgrp_nr(current);
+}
+
+static int ioband_uid(struct bio *bio)
+{
+ return (int)current_uid();
+}
+
+static int ioband_gid(struct bio *bio)
+{
+ return (int)current_gid();
+}
+
+static int ioband_cpuset(struct bio *bio)
+{
+ return 0; /* not implemented yet */
+}
+
+static int ioband_node(struct bio *bio)
+{
+ return 0; /* not implemented yet */
+}
+
+static int ioband_cgroup(struct bio *bio)
+{
+ /*
+ * This function should return the ID of the cgroup which
+ * issued "bio". The ID of the cgroup which the current
+ * process belongs to won't be suitable ID for this purpose,
+ * since some BIOs will be handled by kernel threads like aio
+ * or pdflush on behalf of the process requesting the BIOs.
+ */
+ return 0; /* not implemented yet */
+}
+
+struct group_type dm_ioband_group_type[] = {
+ {"none", NULL},
+ {"pgrp", ioband_process_group},
+ {"pid", ioband_process_id},
+ {"node", ioband_node},
+ {"cpuset", ioband_cpuset},
+ {"cgroup", ioband_cgroup},
+ {"user", ioband_uid},
+ {"uid", ioband_uid},
+ {"gid", ioband_gid},
+ {NULL, NULL}
+};
Index: linux-2.6.30-rc1/drivers/md/dm-ioband.h
===================================================================
--- /dev/null
+++ linux-2.6.30-rc1/drivers/md/dm-ioband.h
@@ -0,0 +1,186 @@
+/*
+ * Copyright (C) 2008 VA Linux Systems Japan K.K.
+ *
+ * I/O bandwidth control
+ *
+ * This file is released under the GPL.
+ */
+
+#include <linux/version.h>
+#include <linux/wait.h>
+
+#define DM_MSG_PREFIX "ioband"
+
+#define DEFAULT_IO_THROTTLE 4
+#define DEFAULT_IO_LIMIT 128
+#define IOBAND_NAME_MAX 31
+#define IOBAND_ID_ANY (-1)
+
+struct ioband_group;
+
+struct ioband_device {
+ struct list_head g_groups;
+ struct delayed_work g_conductor;
+ struct workqueue_struct *g_ioband_wq;
+ struct bio_list g_urgent_bios;
+ int g_io_throttle;
+ int g_io_limit[2];
+ int g_issued[2];
+ int g_blocked;
+ spinlock_t g_lock;
+ struct mutex g_lock_device;
+ wait_queue_head_t g_waitq;
+ wait_queue_head_t g_waitq_suspend;
+ wait_queue_head_t g_waitq_flush;
+
+ int g_ref;
+ struct list_head g_list;
+ int g_flags;
+ char g_name[IOBAND_NAME_MAX + 1];
+ struct policy_type *g_policy;
+
+ /* policy dependent */
+ int (*g_can_submit) (struct ioband_group *);
+ int (*g_prepare_bio) (struct ioband_group *, struct bio *, int);
+ int (*g_restart_bios) (struct ioband_device *);
+ void (*g_hold_bio) (struct ioband_group *, struct bio *);
+ struct bio *(*g_pop_bio) (struct ioband_group *);
+ int (*g_group_ctr) (struct ioband_group *, char *);
+ void (*g_group_dtr) (struct ioband_group *);
+ int (*g_set_param) (struct ioband_group *, char *cmd, char *value);
+ int (*g_should_block) (struct ioband_group *);
+ void (*g_show) (struct ioband_group *, int *, char *, unsigned);
+
+ /* members for weight balancing policy */
+ int g_epoch;
+ int g_weight_total;
+ /* the number of tokens which can be used in every epoch */
+ int g_token_bucket;
+ /* how many epochs tokens can be carried over */
+ int g_carryover;
+ /* how many tokens should be used for one page-sized I/O */
+ int g_token_unit;
+ /* the last group which used a token */
+ struct ioband_group *g_current;
+ /* give another group a chance to be scheduled when the rest
+ of tokens of the current group reaches this mark */
+ int g_yield_mark;
+ /* the latest group which used up its tokens */
+ struct ioband_group *g_expired;
+ /* the group which has the largest number of tokens in the
+ active groups */
+ struct ioband_group *g_dominant;
+ /* the number of unused tokens in this epoch */
+ int g_token_left;
+ /* left-over tokens from the previous epoch */
+ int g_token_extra;
+};
+
+struct ioband_group_stat {
+ unsigned long sectors;
+ unsigned long immediate;
+ unsigned long deferred;
+};
+
+struct ioband_group {
+ struct list_head c_list;
+ struct ioband_device *c_banddev;
+ struct dm_dev *c_dev;
+ struct dm_target *c_target;
+ struct bio_list c_blocked_bios;
+ struct bio_list c_prio_bios;
+ struct rb_root c_group_root;
+ struct rb_node c_group_node;
+ int c_id; /* should be unsigned long or unsigned long long */
+ char c_name[IOBAND_NAME_MAX + 1]; /* rfu */
+ int c_blocked;
+ int c_prio_blocked;
+ wait_queue_head_t c_waitq;
+ int c_flags;
+ struct ioband_group_stat c_stat[2]; /* hold rd/wr status */
+ struct group_type *c_type;
+
+ /* members for weight balancing policy */
+ int c_weight;
+ int c_my_epoch;
+ int c_token;
+ int c_token_initial;
+ int c_limit;
+ int c_consumed;
+
+ /* rfu */
+ /* struct bio_list c_ordered_tag_bios; */
+};
+
+#define IOBAND_URGENT 1
+
+#define DEV_BIO_BLOCKED 1
+#define DEV_SUSPENDED 2
+
+#define set_device_blocked(dp) ((dp)->g_flags |= DEV_BIO_BLOCKED)
+#define clear_device_blocked(dp) ((dp)->g_flags &= ~DEV_BIO_BLOCKED)
+#define is_device_blocked(dp) ((dp)->g_flags & DEV_BIO_BLOCKED)
+
+#define set_device_suspended(dp) ((dp)->g_flags |= DEV_SUSPENDED)
+#define clear_device_suspended(dp) ((dp)->g_flags &= ~DEV_SUSPENDED)
+#define is_device_suspended(dp) ((dp)->g_flags & DEV_SUSPENDED)
+
+#define IOG_PRIO_BIO_WRITE 1
+#define IOG_PRIO_QUEUE 2
+#define IOG_BIO_BLOCKED 4
+#define IOG_GOING_DOWN 8
+#define IOG_SUSPENDED 16
+#define IOG_NEED_UP 32
+
+#define R_OK 0
+#define R_BLOCK 1
+#define R_YIELD 2
+
+#define set_group_blocked(gp) ((gp)->c_flags |= IOG_BIO_BLOCKED)
+#define clear_group_blocked(gp) ((gp)->c_flags &= ~IOG_BIO_BLOCKED)
+#define is_group_blocked(gp) ((gp)->c_flags & IOG_BIO_BLOCKED)
+
+#define set_group_down(gp) ((gp)->c_flags |= IOG_GOING_DOWN)
+#define clear_group_down(gp) ((gp)->c_flags &= ~IOG_GOING_DOWN)
+#define is_group_down(gp) ((gp)->c_flags & IOG_GOING_DOWN)
+
+#define set_group_suspended(gp) ((gp)->c_flags |= IOG_SUSPENDED)
+#define clear_group_suspended(gp) ((gp)->c_flags &= ~IOG_SUSPENDED)
+#define is_group_suspended(gp) ((gp)->c_flags & IOG_SUSPENDED)
+
+#define set_group_need_up(gp) ((gp)->c_flags |= IOG_NEED_UP)
+#define clear_group_need_up(gp) ((gp)->c_flags &= ~IOG_NEED_UP)
+#define group_need_up(gp) ((gp)->c_flags & IOG_NEED_UP)
+
+#define set_prio_read(gp) ((gp)->c_flags |= IOG_PRIO_QUEUE)
+#define clear_prio_read(gp) ((gp)->c_flags &= ~IOG_PRIO_QUEUE)
+#define is_prio_read(gp) \
+ ((gp)->c_flags & (IOG_PRIO_QUEUE|IOG_PRIO_BIO_WRITE) == IOG_PRIO_QUEUE)
+
+#define set_prio_write(gp) \
+ ((gp)->c_flags |= (IOG_PRIO_QUEUE|IOG_PRIO_BIO_WRITE))
+#define clear_prio_write(gp) \
+ ((gp)->c_flags &= ~(IOG_PRIO_QUEUE|IOG_PRIO_BIO_WRITE))
+#define is_prio_write(gp) \
+ ((gp)->c_flags & (IOG_PRIO_QUEUE|IOG_PRIO_BIO_WRITE) == \
+ (IOG_PRIO_QUEUE|IOG_PRIO_BIO_WRITE))
+
+#define set_prio_queue(gp, direct) \
+ ((gp)->c_flags |= (IOG_PRIO_QUEUE|direct))
+#define clear_prio_queue(gp) clear_prio_write(gp)
+#define is_prio_queue(gp) ((gp)->c_flags & IOG_PRIO_QUEUE)
+#define prio_queue_direct(gp) ((gp)->c_flags & IOG_PRIO_BIO_WRITE)
+
+struct policy_type {
+ const char *p_name;
+ int (*p_policy_init) (struct ioband_device *, int, char **);
+};
+
+extern struct policy_type dm_ioband_policy_type[];
+
+struct group_type {
+ const char *t_name;
+ int (*t_getid) (struct bio *);
+};
+
+extern struct group_type dm_ioband_group_type[];

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