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* osd_initiator.h - OSD initiator API definition
* Copyright (C) 2008 Panasas Inc. All rights reserved.
* Authors:
* Boaz Harrosh <>
* Benny Halevy <>
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2
#ifndef __OSD_INITIATOR_H__
#define __OSD_INITIATOR_H__
#include <scsi/osd_protocol.h>
#include <scsi/osd_types.h>
#include <linux/blkdev.h>
#include <scsi/scsi_device.h>
/* Note: "NI" in comments below means "Not Implemented yet" */
/* Configure of code:
* #undef if you *don't* want OSD v1 support in runtime.
* If #defined the initiator will dynamically configure to encode OSD v1
* CDB's if the target is detected to be OSD v1 only.
* OSD v2 only commands, options, and attributes will be ignored if target
* is v1 only.
* If #defined will result in bigger/slower code (OK Slower maybe not)
* Q: Should this be CONFIG_SCSI_OSD_VER1_SUPPORT and set from Kconfig?
#define OSD_VER1_SUPPORT y
enum osd_std_version {
OSD_VER1 = 1,
OSD_VER2 = 2,
* Object-based Storage Device.
* This object represents an OSD device.
* It is not a full linux device in any way. It is only
* a place to hang resources associated with a Linux
* request Q and some default properties.
struct osd_dev {
struct scsi_device *scsi_device;
unsigned def_timeout;
enum osd_std_version version;
/* Unique Identification of an OSD device */
struct osd_dev_info {
unsigned systemid_len;
u8 systemid[OSD_SYSTEMID_LEN];
unsigned osdname_len;
u8 *osdname;
/* Retrieve/return osd_dev(s) for use by Kernel clients
* Use IS_ERR/ERR_PTR on returned "osd_dev *".
struct osd_dev *osduld_path_lookup(const char *dev_name);
struct osd_dev *osduld_info_lookup(const struct osd_dev_info *odi);
void osduld_put_device(struct osd_dev *od);
const struct osd_dev_info *osduld_device_info(struct osd_dev *od);
bool osduld_device_same(struct osd_dev *od, const struct osd_dev_info *odi);
/* Add/remove test ioctls from external modules */
typedef int (do_test_fn)(struct osd_dev *od, unsigned cmd, unsigned long arg);
int osduld_register_test(unsigned ioctl, do_test_fn *do_test);
void osduld_unregister_test(unsigned ioctl);
/* These are called by uld at probe time */
void osd_dev_init(struct osd_dev *od, struct scsi_device *scsi_device);
void osd_dev_fini(struct osd_dev *od);
* osd_auto_detect_ver - Detect the OSD version, return Unique Identification
* @od: OSD target lun handle
* @caps: Capabilities authorizing OSD root read attributes access
* @odi: Retrieved information uniquely identifying the osd target lun
* Note: odi->osdname must be kfreed by caller.
* Auto detects the OSD version of the OSD target and sets the @od
* accordingly. Meanwhile also returns the "system id" and "osd name" root
* attributes which uniquely identify the OSD target. This member is usually
* called by the ULD. ULD users should call osduld_device_info().
* This rutine allocates osd requests and memory at GFP_KERNEL level and might
* sleep.
int osd_auto_detect_ver(struct osd_dev *od,
void *caps, struct osd_dev_info *odi);
static inline struct request_queue *osd_request_queue(struct osd_dev *od)
return od->scsi_device->request_queue;
/* we might want to use function vector in the future */
static inline void osd_dev_set_ver(struct osd_dev *od, enum osd_std_version v)
od->version = v;
static inline bool osd_dev_is_ver1(struct osd_dev *od)
return od->version == OSD_VER1;
return false;
struct osd_request;
typedef void (osd_req_done_fn)(struct osd_request *or, void *private);
struct osd_request {
struct osd_cdb cdb;
struct osd_data_out_integrity_info out_data_integ;
struct osd_data_in_integrity_info in_data_integ;
struct osd_dev *osd_dev;
struct request *request;
struct _osd_req_data_segment {
void *buff;
unsigned alloc_size; /* 0 here means: don't call kfree */
unsigned total_bytes;
} cdb_cont, set_attr, enc_get_attr, get_attr;
struct _osd_io_info {
struct bio *bio;
u64 total_bytes;
u64 residual;
struct request *req;
struct _osd_req_data_segment *last_seg;
u8 *pad_buff;
} out, in;
gfp_t alloc_flags;
unsigned timeout;
unsigned retries;
unsigned sense_len;
u8 sense[OSD_MAX_SENSE_LEN];
enum osd_attributes_mode attributes_mode;
osd_req_done_fn *async_done;
void *async_private;
int async_error;
int req_errors;
static inline bool osd_req_is_ver1(struct osd_request *or)
return osd_dev_is_ver1(or->osd_dev);
* How to use the osd library:
* osd_start_request
* Allocates a request.
* osd_req_*
* Call one of, to encode the desired operation.
* osd_add_{get,set}_attr
* Optionally add attributes to the CDB, list or page mode.
* osd_finalize_request
* Computes final data out/in offsets and signs the request,
* making it ready for execution.
* osd_execute_request
* May be called to execute it through the block layer. Other wise submit
* the associated block request in some other way.
* After execution:
* osd_req_decode_sense
* Decodes sense information to verify execution results.
* osd_req_decode_get_attr
* Retrieve osd_add_get_attr_list() values if used.
* osd_end_request
* Must be called to deallocate the request.
* osd_start_request - Allocate and initialize an osd_request
* @osd_dev: OSD device that holds the scsi-device and default values
* that the request is associated with.
* @gfp: The allocation flags to use for request allocation, and all
* subsequent allocations. This will be stored at
* osd_request->alloc_flags, can be changed by user later
* Allocate osd_request and initialize all members to the
* default/initial state.
struct osd_request *osd_start_request(struct osd_dev *od, gfp_t gfp);
enum osd_req_options {
OSD_REQ_FUA = 0x08, /* Force Unit Access */
OSD_REQ_DPO = 0x10, /* Disable Page Out */
* osd_finalize_request - Sign request and prepare request for execution
* @or: osd_request to prepare
* @options: combination of osd_req_options bit flags or 0.
* @cap: A Pointer to an OSD_CAP_LEN bytes buffer that is received from
* The security manager as capabilities for this cdb.
* @cap_key: The cryptographic key used to sign the cdb/data. Can be null
* if NOSEC is used.
* The actual request and bios are only allocated here, so are the get_attr
* buffers that will receive the returned attributes. Copy's @cap to cdb.
* Sign the cdb/data with @cap_key.
int osd_finalize_request(struct osd_request *or,
u8 options, const void *cap, const u8 *cap_key);
* osd_execute_request - Execute the request synchronously through block-layer
* @or: osd_request to Executed
* Calls blk_execute_rq to q the command and waits for completion.
int osd_execute_request(struct osd_request *or);
* osd_execute_request_async - Execute the request without waitting.
* @or: - osd_request to Executed
* @done: (Optional) - Called at end of execution
* @private: - Will be passed to @done function
* Calls blk_execute_rq_nowait to queue the command. When execution is done
* optionally calls @done with @private as parameter. @or->async_error will
* have the return code
int osd_execute_request_async(struct osd_request *or,
osd_req_done_fn *done, void *private);
* osd_req_decode_sense_full - Decode sense information after execution.
* @or: - osd_request to examine
* @osi - Receives a more detailed error report information (optional).
* @silent - Do not print to dmsg (Even if enabled)
* @bad_obj_list - Some commands act on multiple objects. Failed objects will
* be received here (optional)
* @max_obj - Size of @bad_obj_list.
* @bad_attr_list - List of failing attributes (optional)
* @max_attr - Size of @bad_attr_list.
* After execution, osd_request results are analyzed using this function. The
* return code is the final disposition on the error. So it is possible that a
* CHECK_CONDITION was returned from target but this will return NO_ERROR, for
* example on recovered errors. All parameters are optional if caller does
* not need any returned information.
* Note: This function will also dump the error to dmsg according to settings
* of the SCSI_OSD_DPRINT_SENSE Kconfig value. Set @silent if you know the
* command would routinely fail, to not spam the dmsg file.
* osd_err_priority - osd categorized return codes in ascending severity.
* The categories are borrowed from the pnfs_osd_errno enum.
* See comments for translated Linux codes returned by osd_req_decode_sense.
enum osd_err_priority {
/* Recoverable, caller should clear_highpage() all pages */
OSD_ERR_PRI_UNREACHABLE = 5, /* any other */
OSD_ERR_PRI_EIO = 8, /* -EIO */
struct osd_sense_info {
enum osd_err_priority osd_err_pri;
int key; /* one of enum scsi_sense_keys */
int additional_code ; /* enum osd_additional_sense_codes */
union { /* Sense specific information */
u16 sense_info;
u16 cdb_field_offset; /* scsi_invalid_field_in_cdb */
union { /* Command specific information */
u64 command_info;
u32 not_initiated_command_functions; /* osd_command_functions_bits */
u32 completed_command_functions; /* osd_command_functions_bits */
struct osd_obj_id obj;
struct osd_attr attr;
int osd_req_decode_sense_full(struct osd_request *or,
struct osd_sense_info *osi, bool silent,
struct osd_obj_id *bad_obj_list, int max_obj,
struct osd_attr *bad_attr_list, int max_attr);
static inline int osd_req_decode_sense(struct osd_request *or,
struct osd_sense_info *osi)
return osd_req_decode_sense_full(or, osi, false, NULL, 0, NULL, 0);
* osd_end_request - return osd_request to free store
* @or: osd_request to free
* Deallocate all osd_request resources (struct req's, BIOs, buffers, etc.)
void osd_end_request(struct osd_request *or);
* CDB Encoding
* Note: call only one of the following methods.
* Device commands
void osd_req_set_master_seed_xchg(struct osd_request *or, ...);/* NI */
void osd_req_set_master_key(struct osd_request *or, ...);/* NI */
void osd_req_format(struct osd_request *or, u64 tot_capacity);
/* list all partitions
* @list header must be initialized to zero on first run.
* Call osd_is_obj_list_done() to find if we got the complete list.
int osd_req_list_dev_partitions(struct osd_request *or,
osd_id initial_id, struct osd_obj_id_list *list, unsigned nelem);
void osd_req_flush_obsd(struct osd_request *or,
enum osd_options_flush_scope_values);
void osd_req_perform_scsi_command(struct osd_request *or,
const u8 *cdb, ...);/* NI */
void osd_req_task_management(struct osd_request *or, ...);/* NI */
* Partition commands
void osd_req_create_partition(struct osd_request *or, osd_id partition);
void osd_req_remove_partition(struct osd_request *or, osd_id partition);
void osd_req_set_partition_key(struct osd_request *or,
osd_id partition, u8 new_key_id[OSD_CRYPTO_KEYID_SIZE],
u8 seed[OSD_CRYPTO_SEED_SIZE]);/* NI */
/* list all collections in the partition
* @list header must be init to zero on first run.
* Call osd_is_obj_list_done() to find if we got the complete list.
int osd_req_list_partition_collections(struct osd_request *or,
osd_id partition, osd_id initial_id, struct osd_obj_id_list *list,
unsigned nelem);
/* list all objects in the partition
* @list header must be init to zero on first run.
* Call osd_is_obj_list_done() to find if we got the complete list.
int osd_req_list_partition_objects(struct osd_request *or,
osd_id partition, osd_id initial_id, struct osd_obj_id_list *list,
unsigned nelem);
void osd_req_flush_partition(struct osd_request *or,
osd_id partition, enum osd_options_flush_scope_values);
* Collection commands
void osd_req_create_collection(struct osd_request *or,
const struct osd_obj_id *);/* NI */
void osd_req_remove_collection(struct osd_request *or,
const struct osd_obj_id *);/* NI */
/* list all objects in the collection */
int osd_req_list_collection_objects(struct osd_request *or,
const struct osd_obj_id *, osd_id initial_id,
struct osd_obj_id_list *list, unsigned nelem);
/* V2 only filtered list of objects in the collection */
void osd_req_query(struct osd_request *or, ...);/* NI */
void osd_req_flush_collection(struct osd_request *or,
const struct osd_obj_id *, enum osd_options_flush_scope_values);
void osd_req_get_member_attrs(struct osd_request *or, ...);/* V2-only NI */
void osd_req_set_member_attrs(struct osd_request *or, ...);/* V2-only NI */
* Object commands
void osd_req_create_object(struct osd_request *or, struct osd_obj_id *);
void osd_req_remove_object(struct osd_request *or, struct osd_obj_id *);
void osd_req_write(struct osd_request *or,
const struct osd_obj_id *obj, u64 offset, struct bio *bio, u64 len);
int osd_req_write_kern(struct osd_request *or,
const struct osd_obj_id *obj, u64 offset, void *buff, u64 len);
void osd_req_append(struct osd_request *or,
const struct osd_obj_id *, struct bio *data_out);/* NI */
void osd_req_create_write(struct osd_request *or,
const struct osd_obj_id *, struct bio *data_out, u64 offset);/* NI */
void osd_req_clear(struct osd_request *or,
const struct osd_obj_id *, u64 offset, u64 len);/* NI */
void osd_req_punch(struct osd_request *or,
const struct osd_obj_id *, u64 offset, u64 len);/* V2-only NI */
void osd_req_flush_object(struct osd_request *or,
const struct osd_obj_id *, enum osd_options_flush_scope_values,
/*V2*/ u64 offset, /*V2*/ u64 len);
void osd_req_read(struct osd_request *or,
const struct osd_obj_id *obj, u64 offset, struct bio *bio, u64 len);
int osd_req_read_kern(struct osd_request *or,
const struct osd_obj_id *obj, u64 offset, void *buff, u64 len);
/* Scatter/Gather write/read commands */
int osd_req_write_sg(struct osd_request *or,
const struct osd_obj_id *obj, struct bio *bio,
const struct osd_sg_entry *sglist, unsigned numentries);
int osd_req_read_sg(struct osd_request *or,
const struct osd_obj_id *obj, struct bio *bio,
const struct osd_sg_entry *sglist, unsigned numentries);
int osd_req_write_sg_kern(struct osd_request *or,
const struct osd_obj_id *obj, void **buff,
const struct osd_sg_entry *sglist, unsigned numentries);
int osd_req_read_sg_kern(struct osd_request *or,
const struct osd_obj_id *obj, void **buff,
const struct osd_sg_entry *sglist, unsigned numentries);
* Root/Partition/Collection/Object Attributes commands
/* get before set */
void osd_req_get_attributes(struct osd_request *or, const struct osd_obj_id *);
/* set before get */
void osd_req_set_attributes(struct osd_request *or, const struct osd_obj_id *);
* Attributes appended to most commands
/* Attributes List mode (or V2 CDB) */
* TODO: In ver2 if at finalize time only one attr was set and no gets,
* then the Attributes CDB mode is used automatically to save IO.
/* set a list of attributes. */
int osd_req_add_set_attr_list(struct osd_request *or,
const struct osd_attr *, unsigned nelem);
/* get a list of attributes */
int osd_req_add_get_attr_list(struct osd_request *or,
const struct osd_attr *, unsigned nelem);
* Attributes list decoding
* Must be called after osd_request.request was executed
* It is called in a loop to decode the returned get_attr
* (see osd_add_get_attr)
int osd_req_decode_get_attr_list(struct osd_request *or,
struct osd_attr *, int *nelem, void **iterator);
/* Attributes Page mode */
* Read an attribute page and optionally set one attribute
* Retrieves the attribute page directly to a user buffer.
* @attr_page_data shall stay valid until end of execution.
* See osd_attributes.h for common page structures
int osd_req_add_get_attr_page(struct osd_request *or,
u32 page_id, void *attr_page_data, unsigned max_page_len,
const struct osd_attr *set_one);
#endif /* __OSD_LIB_H__ */