Initial import

1 files changed, 515 insertions, 0 deletions

diff --git a/include/scsi/osd_initiator.h b/include/scsi/osd_initiator.h
new file mode 100644
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+++ b/include/scsi/osd_initiator.h
@@ -0,0 +1,515 @@
+/*
+ * osd_initiator.h - OSD initiator API definition
+ *
+ * Copyright (C) 2008 Panasas Inc.  All rights reserved.
+ *
+ * Authors:
+ *   Boaz Harrosh <ooo@electrozaur.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
+ *
+ */
+#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_VER_NONE = 0,
+	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;
+
+#ifdef OSD_VER1_SUPPORT
+	enum osd_std_version version;
+#endif
+};
+
+/* 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)
+{
+#ifdef OSD_VER1_SUPPORT
+	od->version = v;
+#endif
+}
+
+static inline bool osd_dev_is_ver1(struct osd_dev *od)
+{
+#ifdef OSD_VER1_SUPPORT
+	return od->version == OSD_VER1;
+#else
+	return false;
+#endif
+}
+
+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_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);
+}
+
+/**
+ * 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__ */