diff options
| author | Dan Williams <dan.j.williams@intel.com> | 2015-06-25 04:20:04 -0400 |
|---|---|---|
| committer | Dan Williams <dan.j.williams@intel.com> | 2015-06-25 04:20:04 -0400 |
| commit | 8c2f7e8658df1d3b7cbfa62706941d14c715823a (patch) | |
| tree | ac93512841113f4d1d7a38d788ec73bb21e2d605 /drivers/nvdimm/btt.h | |
| parent | 0ba1c634892b3590779803a701bcb82e8c32cc7a (diff) | |
libnvdimm: infrastructure for btt devices
NVDIMM namespaces, in addition to accepting "struct bio" based requests,
also have the capability to perform byte-aligned accesses. By default
only the bio/block interface is used. However, if another driver can
make effective use of the byte-aligned capability it can claim namespace
interface and use the byte-aligned ->rw_bytes() interface.
The BTT driver is the initial first consumer of this mechanism to allow
adding atomic sector update semantics to a pmem or blk namespace. This
patch is the sysfs infrastructure to allow configuring a BTT instance
for a namespace. Enabling that BTT and performing i/o is in a
subsequent patch.
Cc: Greg KH <gregkh@linuxfoundation.org>
Cc: Neil Brown <neilb@suse.de>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'drivers/nvdimm/btt.h')
| -rw-r--r-- | drivers/nvdimm/btt.h | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/drivers/nvdimm/btt.h b/drivers/nvdimm/btt.h new file mode 100644 index 000000000000..e8f6d8e0ddd3 --- /dev/null +++ b/drivers/nvdimm/btt.h @@ -0,0 +1,45 @@ +/* + * Block Translation Table library + * Copyright (c) 2014-2015, Intel Corporation. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + */ + +#ifndef _LINUX_BTT_H +#define _LINUX_BTT_H + +#include <linux/types.h> + +#define BTT_SIG_LEN 16 +#define BTT_SIG "BTT_ARENA_INFO\0" + +struct btt_sb { + u8 signature[BTT_SIG_LEN]; + u8 uuid[16]; + u8 parent_uuid[16]; + __le32 flags; + __le16 version_major; + __le16 version_minor; + __le32 external_lbasize; + __le32 external_nlba; + __le32 internal_lbasize; + __le32 internal_nlba; + __le32 nfree; + __le32 infosize; + __le64 nextoff; + __le64 dataoff; + __le64 mapoff; + __le64 logoff; + __le64 info2off; + u8 padding[3968]; + __le64 checksum; +}; + +#endif |