@@ -11,6 +11,7 @@ Block Devices
nbd
paride
ramdisk
+ zoned_loop
zram
drbd/index
new file mode 100644
@@ -0,0 +1,168 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+=======================
+Zoned Loop Block Device
+=======================
+
+.. Contents:
+
+ 1) Overview
+ 2) Creating a Zoned Device
+ 3) Deleting a Zoned Device
+ 4) Example
+
+
+1) Overview
+-----------
+
+The zoned loop block device driver (zloop) allows a user to create a zoned block
+device using one regular file per zone as backing storage. This driver does not
+directly control any hardware and uses read, write and truncate operations to
+regular files of a file system to emulate a zoned block device.
+
+Using zloop, zoned block devices with a configurable capacity, zone size and
+number of conventional zones can be created. The storage for each zone of the
+device is implemented using a regular file with a maximum size equal to the zone
+size. The size of a file backing a conventional zone is always equal to the zone
+size. The size of a file backing a sequential zone indicates the amount of data
+sequentially written to the file, that is, the size of the file directly
+indicates the position of the write pointer of the zone.
+
+When resetting a sequential zone, its backing file size is truncated to zero.
+Conversely, for a zone finish operation, the backing file is truncated to the
+zone size. With this, the maximum capacity of a zloop zoned block device created
+can be larger configured to be larger than the storage space available on the
+backing file system. Of course, for such configuration, writing more data than
+the storage space available on the backing file system will result in write
+errors.
+
+The zoned loop block device driver implements a complete zone transition state
+machine. That is, zones can be empty, implicitly opened, explicitly opened,
+closed or full. The current implementation does not support any limits on the
+maximum number of open and active zones.
+
+No user tools are necessary to create and delete zloop devices.
+
+2) Creating a Zoned Device
+--------------------------
+
+Once the zloop module is loaded (or if zloop is compiled in the kernel), the
+character device file /dev/zloop-control can be used to add a zloop device.
+This is done by writing an "add" command directly to the /dev/zloop-control
+device::
+
+ $ modprobe zloop
+ $ ls -l /dev/zloop*
+ crw-------. 1 root root 10, 123 Jan 6 19:18 /dev/zloop-control
+
+ $ mkdir -p <base directory/<device ID>
+ $ echo "add [options]" > /dev/zloop-control
+
+The options available for the add command can be listed by reading the
+/dev/zloop-control device::
+
+ $ cat /dev/zloop-control
+ add id=%d,capacity_mb=%u,zone_size_mb=%u,zone_capacity_mb=%u,conv_zones=%u,base_dir=%s,nr_queues=%u,queue_depth=%u
+ remove id=%d
+
+In more details, the options that can be used with the "add" command are as
+follows.
+
+================ ===========================================================
+id Device number (the X in /dev/zloopX).
+ Default: automatically assigned.
+capacity_mb Device total capacity in MiB. This is always rounded up to
+ the nearest higher multiple of the zone size.
+ Default: 16384 MiB (16 GiB).
+zone_size_mb Device zone size in MiB. Default: 256 MiB.
+zone_capacity_mb Device zone capacity (must always be equal to or lower than
+ the zone size. Default: zone size.
+conv_zones Total number of conventioanl zones starting from sector 0.
+ Default: 8.
+base_dir Path to the base directoy where to create the directory
+ containing the zone files of the device.
+ Default=/var/local/zloop.
+ The device directory containing the zone files is always
+ named with the device ID. E.g. the default zone file
+ directory for /dev/zloop0 is /var/local/zloop/0.
+nr_queues Number of I/O queues of the zoned block device. This value is
+ always capped by the number of online CPUs
+ Default: 1
+queue_depth Maximum I/O queue depth per I/O queue.
+ Default: 64
+================ ===========================================================
+
+3) Deleting a Zoned Device
+--------------------------
+
+Deleting an unused zoned loop block device is done by issuing the "remove"
+command to /dev/zloop-control, specifying the ID of the device to remove::
+
+ $ echo "remove id=X" > /dev/zloop-control
+
+The remove command does not have any option.
+
+A zoned device that was removed can be re-added again without any change to the
+state of the device zones: the device zones are restored to their last state
+before the device was removed. Adding again a zoned device after it was removed
+must always be done using the same configuration as when the device was first
+added. If a zone configuration change is detected, an error will be returned and
+the zoned device will not be created.
+
+To fully delete a zoned device, after executing the remove operation, the device
+base directory containing the backing files of the device zones must be deleted.
+
+4) Example
+----------
+
+The following sequence of commands creates a 2GB zoned device with zones of 64
+MB and a zone capacity of 63 MB::
+
+ $ modprobe zloop
+ $ mkdir -p /var/local/zloop/0
+ $ echo "add capacity_mb=2048,zone_size_mb=64,zone_capacity=63MB" > /dev/zloop-control
+
+For the device created (/dev/zloop0), the zone backing files are all created
+under the default base directory (/var/local/zloop)::
+
+ $ ls -l /var/local/zloop/0
+ total 0
+ -rw-------. 1 root root 67108864 Jan 6 22:23 cnv-000000
+ -rw-------. 1 root root 67108864 Jan 6 22:23 cnv-000001
+ -rw-------. 1 root root 67108864 Jan 6 22:23 cnv-000002
+ -rw-------. 1 root root 67108864 Jan 6 22:23 cnv-000003
+ -rw-------. 1 root root 67108864 Jan 6 22:23 cnv-000004
+ -rw-------. 1 root root 67108864 Jan 6 22:23 cnv-000005
+ -rw-------. 1 root root 67108864 Jan 6 22:23 cnv-000006
+ -rw-------. 1 root root 67108864 Jan 6 22:23 cnv-000007
+ -rw-------. 1 root root 0 Jan 6 22:23 seq-000008
+ -rw-------. 1 root root 0 Jan 6 22:23 seq-000009
+ ...
+
+The zoned device created (/dev/zloop0) can then be used normally::
+
+ $ lsblk -z
+ NAME ZONED ZONE-SZ ZONE-NR ZONE-AMAX ZONE-OMAX ZONE-APP ZONE-WGRAN
+ zloop0 host-managed 64M 32 0 0 1M 4K
+ $ blkzone report /dev/zloop0
+ start: 0x000000000, len 0x020000, cap 0x020000, wptr 0x000000 reset:0 non-seq:0, zcond: 0(nw) [type: 1(CONVENTIONAL)]
+ start: 0x000020000, len 0x020000, cap 0x020000, wptr 0x000000 reset:0 non-seq:0, zcond: 0(nw) [type: 1(CONVENTIONAL)]
+ start: 0x000040000, len 0x020000, cap 0x020000, wptr 0x000000 reset:0 non-seq:0, zcond: 0(nw) [type: 1(CONVENTIONAL)]
+ start: 0x000060000, len 0x020000, cap 0x020000, wptr 0x000000 reset:0 non-seq:0, zcond: 0(nw) [type: 1(CONVENTIONAL)]
+ start: 0x000080000, len 0x020000, cap 0x020000, wptr 0x000000 reset:0 non-seq:0, zcond: 0(nw) [type: 1(CONVENTIONAL)]
+ start: 0x0000a0000, len 0x020000, cap 0x020000, wptr 0x000000 reset:0 non-seq:0, zcond: 0(nw) [type: 1(CONVENTIONAL)]
+ start: 0x0000c0000, len 0x020000, cap 0x020000, wptr 0x000000 reset:0 non-seq:0, zcond: 0(nw) [type: 1(CONVENTIONAL)]
+ start: 0x0000e0000, len 0x020000, cap 0x020000, wptr 0x000000 reset:0 non-seq:0, zcond: 0(nw) [type: 1(CONVENTIONAL)]
+ start: 0x000100000, len 0x020000, cap 0x01f800, wptr 0x000000 reset:0 non-seq:0, zcond: 1(em) [type: 2(SEQ_WRITE_REQUIRED)]
+ start: 0x000120000, len 0x020000, cap 0x01f800, wptr 0x000000 reset:0 non-seq:0, zcond: 1(em) [type: 2(SEQ_WRITE_REQUIRED)]
+ ...
+
+Deleting this device is done using the command::
+
+ $ echo "remove id=0" > /dev/zloop-control
+
+The removed device can be re-added again using the same "add" command as when
+the device was first created. To fully delete a zoned device, its backing files
+should also be deleted after executing the remove command::
+
+ $ rm -r /var/local/zloop/0
@@ -25977,6 +25977,7 @@ M: Damien Le Moal <dlemoal@kernel.org>
R: Christoph Hellwig <hch@lst.de>
L: linux-block@vger.kernel.org
S: Maintained
+F: Documentation/admin-guide/blockdev/zoned_loop.rst
F: drivers/block/zloop.c
ZONEFS FILESYSTEM
Introduce the zoned_loop.rst documentation file under admin-guide/blockdev to document the zoned loop block device driver. An overview of the driver is provided and its usage to create and delete zoned devices described. Signed-off-by: Damien Le Moal <dlemoal@kernel.org> --- Documentation/admin-guide/blockdev/index.rst | 1 + .../admin-guide/blockdev/zoned_loop.rst | 168 ++++++++++++++++++ MAINTAINERS | 1 + 3 files changed, 170 insertions(+) create mode 100644 Documentation/admin-guide/blockdev/zoned_loop.rst