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Release 4.12 include/scsi/osd_initiator.h

Directory: include/scsi
 * 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; }


Boaz Harrosh21100.00%1100.00%

/* 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) { #ifdef OSD_VER1_SUPPORT od->version = v; #endif }


Boaz Harrosh27100.00%1100.00%

static inline bool osd_dev_is_ver1(struct osd_dev *od) { #ifdef OSD_VER1_SUPPORT return od->version == OSD_VER1; #else return false; #endif }


Boaz Harrosh29100.00%1100.00%

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); }


Boaz Harrosh20100.00%2100.00%

/* * 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_REQ_BYPASS_TIMESTAMPS = 0x80, }; /** * 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 { OSD_ERR_PRI_NO_ERROR = 0, /* Recoverable, caller should clear_highpage() all pages */ OSD_ERR_PRI_CLEAR_PAGES = 1, /* -EFAULT */ OSD_ERR_PRI_RESOURCE = 2, /* -ENOMEM */ OSD_ERR_PRI_BAD_CRED = 3, /* -EINVAL */ OSD_ERR_PRI_NO_ACCESS = 4, /* -EACCES */ OSD_ERR_PRI_UNREACHABLE = 5, /* any other */ OSD_ERR_PRI_NOT_FOUND = 6, /* -ENOENT */ OSD_ERR_PRI_NO_SPACE = 7, /* -ENOSPC */ 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); }


Boaz Harrosh35100.00%1100.00%

/** * 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__ */

Overall Contributors

Boaz Harrosh153199.80%1688.89%
David Howells20.13%15.56%
Joe Perches10.07%15.56%
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