/* * 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 "osd_protocol.h" #include "osd_types.h" #include /* Note: "NI" in comments below means "Not Implemented yet" */ /* * 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; }; void osd_dev_init(struct osd_dev *od, struct scsi_device *scsi_device); void osd_dev_fini(struct osd_dev *od); 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; } set_attr, enc_get_attr, get_attr; struct _osd_io_info { struct bio *bio; u64 total_bytes; struct request *req; struct _osd_req_data_segment *last_seg; u8 *pad_buff; } out, in; gfp_t alloc_flags; unsigned timeout; unsigned retries; u8 sense[OSD_MAX_SENSE_LEN]; enum osd_attributes_mode attributes_mode; osd_req_done_fn *async_done; void *async_private; int async_error; }; /* * 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_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 *, struct bio *data_out, u64 offset); 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 *, struct bio *data_in, u64 offset); /* * 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__ */