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/*
* osd_protocol.h - OSD T10 standard C definitions.
*
* Copyright (C) 2008 Panasas Inc. All rights reserved.
*
* Authors:
* Boaz Harrosh <bharrosh@panasas.com>
* Benny Halevy <bhalevy@panasas.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2
*
* This file contains types and constants that are defined by the protocol
* Note: All names and symbols are taken from the OSD standard's text.
*/
#ifndef __OSD_PROTOCOL_H__
#define __OSD_PROTOCOL_H__
#include <linux/types.h>
#include <linux/kernel.h>
#include <asm/unaligned.h>
#include <scsi/scsi.h>
enum {
OSDv1_ADDITIONAL_CDB_LENGTH = 192,
OSDv1_TOTAL_CDB_LEN = OSDv1_ADDITIONAL_CDB_LENGTH + 8,
OSDv1_CAP_LEN = 80,
/* Latest supported version */
OSDv2_ADDITIONAL_CDB_LENGTH = 228,
OSD_ADDITIONAL_CDB_LENGTH =
OSDv2_ADDITIONAL_CDB_LENGTH,
OSD_TOTAL_CDB_LEN = OSD_ADDITIONAL_CDB_LENGTH + 8,
OSD_CAP_LEN = 104,
OSD_SYSTEMID_LEN = 20,
OSDv1_CRYPTO_KEYID_SIZE = 20,
OSDv2_CRYPTO_KEYID_SIZE = 32,
OSD_CRYPTO_KEYID_SIZE = OSDv2_CRYPTO_KEYID_SIZE,
OSD_CRYPTO_SEED_SIZE = 4,
OSD_CRYPTO_NONCE_SIZE = 12,
OSD_MAX_SENSE_LEN = 252, /* from SPC-3 */
OSD_PARTITION_FIRST_ID = 0x10000,
OSD_OBJECT_FIRST_ID = 0x10000,
};
/* (osd-r10 5.2.4)
* osd2r03: 5.2.3 Caching control bits
*/
enum osd_options_byte {
OSD_CDB_FUA = 0x08, /* Force Unit Access */
OSD_CDB_DPO = 0x10, /* Disable Page Out */
};
/*
* osd2r03: 5.2.5 Isolation.
* First 3 bits, V2-only.
* Also for attr 110h "default isolation method" at Root Information page
*/
enum osd_options_byte_isolation {
OSD_ISOLATION_DEFAULT = 0,
OSD_ISOLATION_NONE = 1,
OSD_ISOLATION_STRICT = 2,
OSD_ISOLATION_RANGE = 4,
OSD_ISOLATION_FUNCTIONAL = 5,
OSD_ISOLATION_VENDOR = 7,
};
/* (osd-r10: 6.7)
* osd2r03: 6.8 FLUSH, FLUSH COLLECTION, FLUSH OSD, FLUSH PARTITION
*/
enum osd_options_flush_scope_values {
OSD_CDB_FLUSH_ALL = 0,
OSD_CDB_FLUSH_ATTR_ONLY = 1,
OSD_CDB_FLUSH_ALL_RECURSIVE = 2,
/* V2-only */
OSD_CDB_FLUSH_ALL_RANGE = 2,
};
/* osd2r03: 5.2.10 Timestamps control */
enum {
OSD_CDB_NORMAL_TIMESTAMPS = 0,
OSD_CDB_BYPASS_TIMESTAMPS = 0x7f,
};
/* (osd-r10: 5.2.2.1)
* osd2r03: 5.2.4.1 Get and set attributes CDB format selection
* 2 bits at second nibble of command_specific_options byte
*/
enum osd_attributes_mode {
/* V2-only */
OSD_CDB_SET_ONE_ATTR = 0x10,
OSD_CDB_GET_ATTR_PAGE_SET_ONE = 0x20,
OSD_CDB_GET_SET_ATTR_LISTS = 0x30,
OSD_CDB_GET_SET_ATTR_MASK = 0x30,
};
/* (osd-r10: 4.12.5)
* osd2r03: 4.14.5 Data-In and Data-Out buffer offsets
* byte offset = mantissa * (2^(exponent+8))
* struct {
* unsigned mantissa: 28;
* int exponent: 04;
* }
*/
typedef __be32 osd_cdb_offset;
enum {
OSD_OFFSET_UNUSED = 0xFFFFFFFF,
OSD_OFFSET_MAX_BITS = 28,
OSDv1_OFFSET_MIN_SHIFT = 8,
OSD_OFFSET_MIN_SHIFT = 3,
OSD_OFFSET_MAX_SHIFT = 16,
};
/* Return the smallest allowed encoded offset that contains @offset.
*
* The actual encoded offset returned is @offset + *padding.
* (up to max_shift, non-inclusive)
*/
osd_cdb_offset __osd_encode_offset(u64 offset, unsigned *padding,
int min_shift, int max_shift);
/* Minimum alignment is 256 bytes
* Note: Seems from std v1 that exponent can be from 0+8 to 0xE+8 (inclusive)
* which is 8 to 23 but IBM code restricts it to 16, so be it.
*/
static inline osd_cdb_offset osd_encode_offset_v1(u64 offset, unsigned *padding)
{
return __osd_encode_offset(offset, padding,
OSDv1_OFFSET_MIN_SHIFT, OSD_OFFSET_MAX_SHIFT);
}
/* Minimum 8 bytes alignment
* Same as v1 but since exponent can be signed than a less than
* 256 alignment can be reached with small offsets (<2GB)
*/
static inline osd_cdb_offset osd_encode_offset_v2(u64 offset, unsigned *padding)
{
return __osd_encode_offset(offset, padding,
OSD_OFFSET_MIN_SHIFT, OSD_OFFSET_MAX_SHIFT);
}
/* osd2r03: 5.2.1 Overview */
struct osd_cdb_head {
struct scsi_varlen_cdb_hdr varlen_cdb;
/*10*/ u8 options;
u8 command_specific_options;
u8 timestamp_control;
/*13*/ u8 reserved1[3];
/*16*/ __be64 partition;
/*24*/ __be64 object;
/*32*/ union { /* V1 vs V2 alignment differences */
struct __osdv1_cdb_addr_len {
/*32*/ __be32 list_identifier;/* Rarely used */
/*36*/ __be64 length;
/*44*/ __be64 start_address;
} __packed v1;
struct __osdv2_cdb_addr_len {
/* called allocation_length in some commands */
/*32*/ __be64 length;
/*40*/ __be64 start_address;
union {
/*48*/ __be32 list_identifier;/* Rarely used */
/* OSD2r05 5.2.5 CDB continuation length */
/*48*/ __be32 cdb_continuation_length;
};
} __packed v2;
};
/*52*/ union { /* selected attributes mode Page/List/Single */
struct osd_attributes_page_mode {
/*52*/ __be32 get_attr_page;
/*56*/ __be32 get_attr_alloc_length;
/*60*/ osd_cdb_offset get_attr_offset;
/*64*/ __be32 set_attr_page;
/*68*/ __be32 set_attr_id;
/*72*/ __be32 set_attr_length;
/*76*/ osd_cdb_offset set_attr_offset;
/*80*/ } __packed attrs_page;
struct osd_attributes_list_mode {
/*52*/ __be32 get_attr_desc_bytes;
/*56*/ osd_cdb_offset get_attr_desc_offset;
/*60*/ __be32 get_attr_alloc_length;
/*64*/ osd_cdb_offset get_attr_offset;
/*68*/ __be32 set_attr_bytes;
/*72*/ osd_cdb_offset set_attr_offset;
__be32 not_used;
/*80*/ } __packed attrs_list;
/* osd2r03:5.2.4.2 Set one attribute value using CDB fields */
struct osd_attributes_cdb_mode {
/*52*/ __be32 set_attr_page;
/*56*/ __be32 set_attr_id;
/*60*/ __be16 set_attr_len;
/*62*/ u8 set_attr_val[18];
/*80*/ } __packed attrs_cdb;
/*52*/ u8 get_set_attributes_parameters[28];
};
} __packed;
/*80*/
/*160 v1*/
struct osdv1_security_parameters {
/*160*/u8 integrity_check_value[OSDv1_CRYPTO_KEYID_SIZE];
/*180*/u8 request_nonce[OSD_CRYPTO_NONCE_SIZE];
/*192*/osd_cdb_offset data_in_integrity_check_offset;
/*196*/osd_cdb_offset data_out_integrity_check_offset;
} __packed;
/*200 v1*/
/*184 v2*/
struct osdv2_security_parameters {
/*184*/u8 integrity_check_value[OSDv2_CRYPTO_KEYID_SIZE];
/*216*/u8 request_nonce[OSD_CRYPTO_NONCE_SIZE];
/*228*/osd_cdb_offset data_in_integrity_check_offset;
/*232*/osd_cdb_offset data_out_integrity_check_offset;
} __packed;
/*236 v2*/
struct osd_security_parameters {
union {
struct osdv1_security_parameters v1;
struct osdv2_security_parameters v2;
};
};
struct osdv1_cdb {
struct osd_cdb_head h;
u8 caps[OSDv1_CAP_LEN];
struct osdv1_security_parameters sec_params;
} __packed;
struct osdv2_cdb {
struct osd_cdb_head h;
u8 caps[OSD_CAP_LEN];
struct osdv2_security_parameters sec_params;
} __packed;
struct osd_cdb {
union {
struct osdv1_cdb v1;
struct osdv2_cdb v2;
u8 buff[OSD_TOTAL_CDB_LEN];
};
} __packed;
static inline struct osd_cdb_head *osd_cdb_head(struct osd_cdb *ocdb)
{
return (struct osd_cdb_head *)ocdb->buff;
}
/* define both version actions
* Ex name = FORMAT_OSD we have OSD_ACT_FORMAT_OSD && OSDv1_ACT_FORMAT_OSD
*/
#define OSD_ACT___(Name, Num) \
OSD_ACT_##Name = __constant_cpu_to_be16(0x8880 + Num), \
OSDv1_ACT_##Name = __constant_cpu_to_be16(0x8800 + Num),
/* V2 only actions */
#define OSD_ACT_V2(Name, Num) \
OSD_ACT_##Name = __constant_cpu_to_be16(0x8880 + Num),
#define OSD_ACT_V1_V2(Name, Num1, Num2) \
OSD_ACT_##Name = __constant_cpu_to_be16(Num2), \
OSDv1_ACT_##Name = __constant_cpu_to_be16(Num1),
enum osd_service_actions {
OSD_ACT_V2(OBJECT_STRUCTURE_CHECK, 0x00)
OSD_ACT___(FORMAT_OSD, 0x01)
OSD_ACT___(CREATE, 0x02)
OSD_ACT___(LIST, 0x03)
OSD_ACT_V2(PUNCH, 0x04)
OSD_ACT___(READ, 0x05)
OSD_ACT___(WRITE, 0x06)
OSD_ACT___(APPEND, 0x07)
OSD_ACT___(FLUSH, 0x08)
OSD_ACT_V2(CLEAR, 0x09)
OSD_ACT___(REMOVE, 0x0A)
OSD_ACT___(CREATE_PARTITION, 0x0B)
OSD_ACT___(REMOVE_PARTITION, 0x0C)
OSD_ACT___(GET_ATTRIBUTES, 0x0E)
OSD_ACT___(SET_ATTRIBUTES, 0x0F)
OSD_ACT___(CREATE_AND_WRITE, 0x12)
OSD_ACT___(CREATE_COLLECTION, 0x15)
OSD_ACT___(REMOVE_COLLECTION, 0x16)
OSD_ACT___(LIST_COLLECTION, 0x17)
OSD_ACT___(SET_KEY, 0x18)
OSD_ACT___(SET_MASTER_KEY, 0x19)
OSD_ACT___(FLUSH_COLLECTION, 0x1A)
OSD_ACT___(FLUSH_PARTITION, 0x1B)
OSD_ACT___(FLUSH_OSD, 0x1C)
OSD_ACT_V2(QUERY, 0x20)
OSD_ACT_V2(REMOVE_MEMBER_OBJECTS, 0x21)
OSD_ACT_V2(GET_MEMBER_ATTRIBUTES, 0x22)
OSD_ACT_V2(SET_MEMBER_ATTRIBUTES, 0x23)
OSD_ACT_V2(CREATE_CLONE, 0x28)
OSD_ACT_V2(CREATE_SNAPSHOT, 0x29)
OSD_ACT_V2(DETACH_CLONE, 0x2A)
OSD_ACT_V2(REFRESH_SNAPSHOT_CLONE, 0x2B)
OSD_ACT_V2(RESTORE_PARTITION_FROM_SNAPSHOT, 0x2C)
OSD_ACT_V2(READ_MAP, 0x31)
OSD_ACT_V2(READ_MAPS_COMPARE, 0x32)
OSD_ACT_V1_V2(PERFORM_SCSI_COMMAND, 0x8F7E, 0x8F7C)
OSD_ACT_V1_V2(SCSI_TASK_MANAGEMENT, 0x8F7F, 0x8F7D)
/* 0x8F80 to 0x8FFF are Vendor specific */
};
/* osd2r03: 7.1.3.2 List entry format for retrieving attributes */
struct osd_attributes_list_attrid {
__be32 attr_page;
__be32 attr_id;
} __packed;
/*
* NOTE: v1: is not aligned.
*/
struct osdv1_attributes_list_element {
__be32 attr_page;
__be32 attr_id;
__be16 attr_bytes; /* valid bytes at attr_val without padding */
u8 attr_val[0];
} __packed;
/*
* osd2r03: 7.1.3.3 List entry format for retrieved attributes and
* for setting attributes
* NOTE: v2 is 8-bytes aligned
*/
struct osdv2_attributes_list_element {
__be32 attr_page;
__be32 attr_id;
u8 reserved[6];
__be16 attr_bytes; /* valid bytes at attr_val without padding */
u8 attr_val[0];
} __packed;
enum {
OSDv1_ATTRIBUTES_ELEM_ALIGN = 1,
OSD_ATTRIBUTES_ELEM_ALIGN = 8,
};
enum {
OSD_ATTR_LIST_ALL_PAGES = 0xFFFFFFFF,
OSD_ATTR_LIST_ALL_IN_PAGE = 0xFFFFFFFF,
};
static inline unsigned osdv1_attr_list_elem_size(unsigned len)
{
return ALIGN(len + sizeof(struct osdv1_attributes_list_element),
OSDv1_ATTRIBUTES_ELEM_ALIGN);
}
static inline unsigned osdv2_attr_list_elem_size(unsigned len)
{
return ALIGN(len + sizeof(struct osdv2_attributes_list_element),
OSD_ATTRIBUTES_ELEM_ALIGN);
}
/*
* osd2r03: 7.1.3 OSD attributes lists (Table 184) — List type values
*/
enum osd_attr_list_types {
OSD_ATTR_LIST_GET = 0x1, /* descriptors only */
OSD_ATTR_LIST_SET_RETRIEVE = 0x9, /*descriptors/values variable-length*/
OSD_V2_ATTR_LIST_MULTIPLE = 0xE, /* ver2, Multiple Objects lists*/
OSD_V1_ATTR_LIST_CREATE_MULTIPLE = 0xF,/*ver1, used by create_multple*/
};
/* osd2r03: 7.1.3.4 Multi-object retrieved attributes format */
struct osd_attributes_list_multi_header {
__be64 object_id;
u8 object_type; /* object_type enum below */
u8 reserved[5];
__be16 list_bytes;
/* followed by struct osd_attributes_list_element's */
};
struct osdv1_attributes_list_header {
u8 type; /* low 4-bit only */
u8 pad;
__be16 list_bytes; /* Initiator shall set to Zero. Only set by target */
/*
* type=9 followed by struct osd_attributes_list_element's
* type=E followed by struct osd_attributes_list_multi_header's
*/
} __packed;
static inline unsigned osdv1_list_size(struct osdv1_attributes_list_header *h)
{
return be16_to_cpu(h->list_bytes);
}
struct osdv2_attributes_list_header {
u8 type; /* lower 4-bits only */
u8 pad[3];
/*4*/ __be32 list_bytes; /* Initiator shall set to zero. Only set by target */
/*
* type=9 followed by struct osd_attributes_list_element's
* type=E followed by struct osd_attributes_list_multi_header's
*/
} __packed;
static inline unsigned osdv2_list_size(struct osdv2_attributes_list_header *h)
{
return be32_to_cpu(h->list_bytes);
}
/* (osd-r10 6.13)
* osd2r03: 6.15 LIST (Table 79) LIST command parameter data.
* for root_lstchg below
*/
enum {
OSD_OBJ_ID_LIST_PAR = 0x1, /* V1-only. Not used in V2 */
OSD_OBJ_ID_LIST_LSTCHG = 0x2,
};
/*
* osd2r03: 6.15.2 LIST command parameter data
* (Also for LIST COLLECTION)
*/
struct osd_obj_id_list {
__be64 list_bytes; /* bytes in list excluding list_bytes (-8) */
__be64 continuation_id;
__be32 list_identifier;
u8 pad[3];
u8 root_lstchg;
__be64 object_ids[0];
} __packed;
static inline bool osd_is_obj_list_done(struct osd_obj_id_list *list,
bool *is_changed)
{
*is_changed = (0 != (list->root_lstchg & OSD_OBJ_ID_LIST_LSTCHG));
return 0 != list->continuation_id;
}
/*
* osd2r03: 4.12.4.5 The ALLDATA security method
*/
struct osd_data_out_integrity_info {
__be64 data_bytes;
__be64 set_attributes_bytes;
__be64 get_attributes_bytes;
__u8 integrity_check_value[OSD_CRYPTO_KEYID_SIZE];
} __packed;
/* Same osd_data_out_integrity_info is used for OSD2/OSD1. The only difference
* Is the sizeof the structure since in OSD1 the last array is smaller. Use
* below for version independent handling of this structure
*/
static inline int osd_data_out_integrity_info_sizeof(bool is_ver1)
{
return sizeof(struct osd_data_out_integrity_info) -
(is_ver1 * (OSDv2_CRYPTO_KEYID_SIZE - OSDv1_CRYPTO_KEYID_SIZE));
}
struct osd_data_in_integrity_info {
__be64 data_bytes;
__be64 retrieved_attributes_bytes;
__u8 integrity_check_value[OSD_CRYPTO_KEYID_SIZE];
} __packed;
/* Same osd_data_in_integrity_info is used for OSD2/OSD1. The only difference
* Is the sizeof the structure since in OSD1 the last array is smaller. Use
* below for version independent handling of this structure
*/
static inline int osd_data_in_integrity_info_sizeof(bool is_ver1)
{
return sizeof(struct osd_data_in_integrity_info) -
(is_ver1 * (OSDv2_CRYPTO_KEYID_SIZE - OSDv1_CRYPTO_KEYID_SIZE));
}
struct osd_timestamp {
u8 time[6]; /* number of milliseconds since 1/1/1970 UT (big endian) */
} __packed;
/* FIXME: define helper functions to convert to/from osd time format */
/*
* Capability & Security definitions
* osd2r03: 4.11.2.2 Capability format
* osd2r03: 5.2.8 Security parameters
*/
struct osd_key_identifier {
u8 id[7]; /* if you know why 7 please email bharrosh@panasas.com */
} __packed;
/* for osd_capability.format */
enum {
OSD_SEC_CAP_FORMAT_NO_CAPS = 0,
OSD_SEC_CAP_FORMAT_VER1 = 1,
OSD_SEC_CAP_FORMAT_VER2 = 2,
};
/* security_method */
enum {
OSD_SEC_NOSEC = 0,
OSD_SEC_CAPKEY = 1,
OSD_SEC_CMDRSP = 2,
OSD_SEC_ALLDATA = 3,
};
enum object_type {
OSD_SEC_OBJ_ROOT = 0x1,
OSD_SEC_OBJ_PARTITION = 0x2,
OSD_SEC_OBJ_COLLECTION = 0x40,
OSD_SEC_OBJ_USER = 0x80,
};
enum osd_capability_bit_masks {
OSD_SEC_CAP_APPEND = BIT(0),
OSD_SEC_CAP_OBJ_MGMT = BIT(1),
OSD_SEC_CAP_REMOVE = BIT(2),
OSD_SEC_CAP_CREATE = BIT(3),
OSD_SEC_CAP_SET_ATTR = BIT(4),
OSD_SEC_CAP_GET_ATTR = BIT(5),
OSD_SEC_CAP_WRITE = BIT(6),
OSD_SEC_CAP_READ = BIT(7),
OSD_SEC_CAP_NONE1 = BIT(8),
OSD_SEC_CAP_NONE2 = BIT(9),
OSD_SEC_GBL_REM = BIT(10), /*v2 only*/
OSD_SEC_CAP_QUERY = BIT(11), /*v2 only*/
OSD_SEC_CAP_M_OBJECT = BIT(12), /*v2 only*/
OSD_SEC_CAP_POL_SEC = BIT(13),
OSD_SEC_CAP_GLOBAL = BIT(14),
OSD_SEC_CAP_DEV_MGMT = BIT(15),
};
/* for object_descriptor_type (hi nibble used) */
enum {
OSD_SEC_OBJ_DESC_NONE = 0, /* Not allowed */
OSD_SEC_OBJ_DESC_OBJ = 1 << 4, /* v1: also collection */
OSD_SEC_OBJ_DESC_PAR = 2 << 4, /* also root */
OSD_SEC_OBJ_DESC_COL = 3 << 4, /* v2 only */
};
/* (osd-r10:4.9.2.2)
* osd2r03:4.11.2.2 Capability format
*/
struct osd_capability_head {
u8 format; /* low nibble */
u8 integrity_algorithm__key_version; /* MAKE_BYTE(integ_alg, key_ver) */
u8 security_method;
u8 reserved1;
/*04*/ struct osd_timestamp expiration_time;
/*10*/ u8 audit[20];
/*30*/ u8 discriminator[12];
/*42*/ struct osd_timestamp object_created_time;
/*48*/ u8 object_type;
/*49*/ u8 permissions_bit_mask[5];
/*54*/ u8 reserved2;
/*55*/ u8 object_descriptor_type; /* high nibble */
} __packed;
/*56 v1*/
struct osdv1_cap_object_descriptor {
union {
struct {
/*56*/ __be32 policy_access_tag;
/*60*/ __be64 allowed_partition_id;
/*68*/ __be64 allowed_object_id;
/*76*/ __be32 reserved;
} __packed obj_desc;
/*56*/ u8 object_descriptor[24];
};
} __packed;
/*80 v1*/
/*56 v2*/
struct osd_cap_object_descriptor {
union {
struct {
/*56*/ __be32 allowed_attributes_access;
/*60*/ __be32 policy_access_tag;
/*64*/ __be16 boot_epoch;
/*66*/ u8 reserved[6];
/*72*/ __be64 allowed_partition_id;
/*80*/ __be64 allowed_object_id;
/*88*/ __be64 allowed_range_length;
/*96*/ __be64 allowed_range_start;
} __packed obj_desc;
/*56*/ u8 object_descriptor[48];
};
} __packed;
/*104 v2*/
struct osdv1_capability {
struct osd_capability_head h;
struct osdv1_cap_object_descriptor od;
} __packed;
struct osd_capability {
struct osd_capability_head h;
struct osd_cap_object_descriptor od;
} __packed;
/**
* osd_sec_set_caps - set cap-bits into the capabilities header
*
* @cap: The osd_capability_head to set cap bits to.
* @bit_mask: Use an ORed list of enum osd_capability_bit_masks values
*
* permissions_bit_mask is unaligned use below to set into caps
* in a version independent way
*/
static inline void osd_sec_set_caps(struct osd_capability_head *cap,
u16 bit_mask)
{
/*
*Note: The bits above are defined LE order this is because this way
* they can grow in the future to more then 16, and still retain
* there constant values.
*/
put_unaligned_le16(bit_mask, &cap->permissions_bit_mask);
}
/* osd2r05a sec 5.3: CDB continuation segment formats */
enum osd_continuation_segment_format {
CDB_CONTINUATION_FORMAT_V2 = 0x01,
};
struct osd_continuation_segment_header {
u8 format;
u8 reserved1;
__be16 service_action;
__be32 reserved2;
u8 integrity_check[OSDv2_CRYPTO_KEYID_SIZE];
} __packed;
/* osd2r05a sec 5.4.1: CDB continuation descriptors */
enum osd_continuation_descriptor_type {
NO_MORE_DESCRIPTORS = 0x0000,
SCATTER_GATHER_LIST = 0x0001,
QUERY_LIST = 0x0002,
USER_OBJECT = 0x0003,
COPY_USER_OBJECT_SOURCE = 0x0101,
EXTENSION_CAPABILITIES = 0xFFEE
};
struct osd_continuation_descriptor_header {
__be16 type;
u8 reserved;
u8 pad_length;
__be32 length;
} __packed;
/* osd2r05a sec 5.4.2: Scatter/gather list */
struct osd_sg_list_entry {
__be64 offset;
__be64 len;
};
struct osd_sg_continuation_descriptor {
struct osd_continuation_descriptor_header hdr;
struct osd_sg_list_entry entries[];
};
#endif /* ndef __OSD_PROTOCOL_H__ */
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