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authorMatias Bjørling <m@bjorling.me>2015-10-28 21:54:55 +0300
committerJens Axboe <axboe@fb.com>2015-10-29 10:21:42 +0300
commitcd9e9808d18fe7107c306f6e71c8be7230ee42b4 (patch)
tree1e447cc1019e8128753bbf78712484b8eb8144f4 /Documentation/ioctl
parentb3975e94f5688691f487ea00126dabe8f5bee3af (diff)
downloadlinux-cd9e9808d18fe7107c306f6e71c8be7230ee42b4.tar.xz
lightnvm: Support for Open-Channel SSDs
Open-channel SSDs are devices that share responsibilities with the host in order to implement and maintain features that typical SSDs keep strictly in firmware. These include (i) the Flash Translation Layer (FTL), (ii) bad block management, and (iii) hardware units such as the flash controller, the interface controller, and large amounts of flash chips. In this way, Open-channels SSDs exposes direct access to their physical flash storage, while keeping a subset of the internal features of SSDs. LightNVM is a specification that gives support to Open-channel SSDs LightNVM allows the host to manage data placement, garbage collection, and parallelism. Device specific responsibilities such as bad block management, FTL extensions to support atomic IOs, or metadata persistence are still handled by the device. The implementation of LightNVM consists of two parts: core and (multiple) targets. The core implements functionality shared across targets. This is initialization, teardown and statistics. The targets implement the interface that exposes physical flash to user-space applications. Examples of such targets include key-value store, object-store, as well as traditional block devices, which can be application-specific. Contributions in this patch from: Javier Gonzalez <jg@lightnvm.io> Dongsheng Yang <yangds.fnst@cn.fujitsu.com> Jesper Madsen <jmad@itu.dk> Signed-off-by: Matias Bjørling <m@bjorling.me> Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'Documentation/ioctl')
-rw-r--r--Documentation/ioctl/ioctl-number.txt1
1 files changed, 1 insertions, 0 deletions
diff --git a/Documentation/ioctl/ioctl-number.txt b/Documentation/ioctl/ioctl-number.txt
index df1b25eb8382..8a44d44cf901 100644
--- a/Documentation/ioctl/ioctl-number.txt
+++ b/Documentation/ioctl/ioctl-number.txt
@@ -149,6 +149,7 @@ Code Seq#(hex) Include File Comments
'K' all linux/kd.h
'L' 00-1F linux/loop.h conflict!
'L' 10-1F drivers/scsi/mpt2sas/mpt2sas_ctl.h conflict!
+'L' 20-2F linux/lightnvm.h
'L' E0-FF linux/ppdd.h encrypted disk device driver
<http://linux01.gwdg.de/~alatham/ppdd.html>
'M' all linux/soundcard.h conflict!