include/linux/pnfs_osd_xdr.h - arm/linux - Git at Google

 /*
  *  pNFS-osd on-the-wire data structures
  *
  *  Copyright (C) 2007 Panasas Inc. [year of first publication]
  *  All rights reserved.
  *
  *  Benny Halevy <bhalevy@panasas.com>
  *  Boaz Harrosh <ooo@electrozaur.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
  *  See the file COPYING included with this distribution for more details.
  *
  *  Redistribution and use in source and binary forms, with or without
  *  modification, are permitted provided that the following conditions
  *  are met:
  *
  *  1. Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  *  2. Redistributions in binary form must reproduce the above copyright
  *     notice, this list of conditions and the following disclaimer in the
  *     documentation and/or other materials provided with the distribution.
  *  3. Neither the name of the Panasas company nor the names of its
  *     contributors may be used to endorse or promote products derived
  *     from this software without specific prior written permission.
  *
  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 #ifndef __PNFS_OSD_XDR_H__
 #define __PNFS_OSD_XDR_H__

 #include <linux/nfs_fs.h>

 /*
  * draft-ietf-nfsv4-minorversion-22
  * draft-ietf-nfsv4-pnfs-obj-12
  */

 /* Layout Structure */

 enum pnfs_osd_raid_algorithm4 {
 	PNFS_OSD_RAID_0		= 1,
 	PNFS_OSD_RAID_4		= 2,
 	PNFS_OSD_RAID_5		= 3,
 	PNFS_OSD_RAID_PQ	= 4     /* Reed-Solomon P+Q */
 };

 /*   struct pnfs_osd_data_map4 {
  *       uint32_t                    odm_num_comps;
  *       length4                     odm_stripe_unit;
  *       uint32_t                    odm_group_width;
  *       uint32_t                    odm_group_depth;
  *       uint32_t                    odm_mirror_cnt;
  *       pnfs_osd_raid_algorithm4    odm_raid_algorithm;
  *   };
  */
 struct pnfs_osd_data_map {
 	u32	odm_num_comps;
 	u64	odm_stripe_unit;
 	u32	odm_group_width;
 	u32	odm_group_depth;
 	u32	odm_mirror_cnt;
 	u32	odm_raid_algorithm;
 };

 /*   struct pnfs_osd_objid4 {
  *       deviceid4       oid_device_id;
  *       uint64_t        oid_partition_id;
  *       uint64_t        oid_object_id;
  *   };
  */
 struct pnfs_osd_objid {
 	struct nfs4_deviceid	oid_device_id;
 	u64			oid_partition_id;
 	u64			oid_object_id;
 };

 /* For printout. I use:
  * kprint("dev(%llx:%llx)", _DEVID_LO(pointer), _DEVID_HI(pointer));
  * BE style
  */
 #define _DEVID_LO(oid_device_id) \
 	(unsigned long long)be64_to_cpup((__be64 *)(oid_device_id)->data)

 #define _DEVID_HI(oid_device_id) \
 	(unsigned long long)be64_to_cpup(((__be64 *)(oid_device_id)->data) + 1)

 enum pnfs_osd_version {
 	PNFS_OSD_MISSING              = 0,
 	PNFS_OSD_VERSION_1            = 1,
 	PNFS_OSD_VERSION_2            = 2
 };

 struct pnfs_osd_opaque_cred {
 	u32 cred_len;
 	void *cred;
 };

 enum pnfs_osd_cap_key_sec {
 	PNFS_OSD_CAP_KEY_SEC_NONE     = 0,
 	PNFS_OSD_CAP_KEY_SEC_SSV      = 1,
 };

 /*   struct pnfs_osd_object_cred4 {
  *       pnfs_osd_objid4         oc_object_id;
  *       pnfs_osd_version4       oc_osd_version;
  *       pnfs_osd_cap_key_sec4   oc_cap_key_sec;
  *       opaque                  oc_capability_key<>;
  *       opaque                  oc_capability<>;
  *   };
  */
 struct pnfs_osd_object_cred {
 	struct pnfs_osd_objid		oc_object_id;
 	u32				oc_osd_version;
 	u32				oc_cap_key_sec;
 	struct pnfs_osd_opaque_cred	oc_cap_key;
 	struct pnfs_osd_opaque_cred	oc_cap;
 };

 /*   struct pnfs_osd_layout4 {
  *       pnfs_osd_data_map4      olo_map;
  *       uint32_t                olo_comps_index;
  *       pnfs_osd_object_cred4   olo_components<>;
  *   };
  */
 struct pnfs_osd_layout {
 	struct pnfs_osd_data_map	olo_map;
 	u32				olo_comps_index;
 	u32				olo_num_comps;
 	struct pnfs_osd_object_cred	*olo_comps;
 };

 /* Device Address */
 enum pnfs_osd_targetid_type {
 	OBJ_TARGET_ANON = 1,
 	OBJ_TARGET_SCSI_NAME = 2,
 	OBJ_TARGET_SCSI_DEVICE_ID = 3,
 };

 /*   union pnfs_osd_targetid4 switch (pnfs_osd_targetid_type4 oti_type) {
  *       case OBJ_TARGET_SCSI_NAME:
  *           string              oti_scsi_name<>;
  *
  *       case OBJ_TARGET_SCSI_DEVICE_ID:
  *           opaque              oti_scsi_device_id<>;
  *
  *       default:
  *           void;
  *   };
  *
  *   union pnfs_osd_targetaddr4 switch (bool ota_available) {
  *       case TRUE:
  *           netaddr4            ota_netaddr;
  *       case FALSE:
  *           void;
  *   };
  *
  *   struct pnfs_osd_deviceaddr4 {
  *       pnfs_osd_targetid4      oda_targetid;
  *       pnfs_osd_targetaddr4    oda_targetaddr;
  *       uint64_t                oda_lun;
  *       opaque                  oda_systemid<>;
  *       pnfs_osd_object_cred4   oda_root_obj_cred;
  *       opaque                  oda_osdname<>;
  *   };
  */
 struct pnfs_osd_targetid {
 	u32				oti_type;
 	struct nfs4_string		oti_scsi_device_id;
 };

 /*   struct netaddr4 {
  *       // see struct rpcb in RFC1833
  *       string r_netid<>;    // network id
  *       string r_addr<>;     // universal address
  *   };
  */
 struct pnfs_osd_net_addr {
 	struct nfs4_string	r_netid;
 	struct nfs4_string	r_addr;
 };

 struct pnfs_osd_targetaddr {
 	u32				ota_available;
 	struct pnfs_osd_net_addr	ota_netaddr;
 };

 struct pnfs_osd_deviceaddr {
 	struct pnfs_osd_targetid	oda_targetid;
 	struct pnfs_osd_targetaddr	oda_targetaddr;
 	u8				oda_lun[8];
 	struct nfs4_string		oda_systemid;
 	struct pnfs_osd_object_cred	oda_root_obj_cred;
 	struct nfs4_string		oda_osdname;
 };

 /* LAYOUTCOMMIT: layoutupdate */

 /*   union pnfs_osd_deltaspaceused4 switch (bool dsu_valid) {
  *       case TRUE:
  *           int64_t     dsu_delta;
  *       case FALSE:
  *           void;
  *   };
  *
  *   struct pnfs_osd_layoutupdate4 {
  *       pnfs_osd_deltaspaceused4    olu_delta_space_used;
  *       bool                        olu_ioerr_flag;
  *   };
  */
 struct pnfs_osd_layoutupdate {
 	u32	dsu_valid;
 	s64	dsu_delta;
 	u32	olu_ioerr_flag;
 };

 /* LAYOUTRETURN: I/O Rrror Report */

 enum pnfs_osd_errno {
 	PNFS_OSD_ERR_EIO		= 1,
 	PNFS_OSD_ERR_NOT_FOUND		= 2,
 	PNFS_OSD_ERR_NO_SPACE		= 3,
 	PNFS_OSD_ERR_BAD_CRED		= 4,
 	PNFS_OSD_ERR_NO_ACCESS		= 5,
 	PNFS_OSD_ERR_UNREACHABLE	= 6,
 	PNFS_OSD_ERR_RESOURCE		= 7
 };

 /*   struct pnfs_osd_ioerr4 {
  *       pnfs_osd_objid4     oer_component;
  *       length4             oer_comp_offset;
  *       length4             oer_comp_length;
  *       bool                oer_iswrite;
  *       pnfs_osd_errno4     oer_errno;
  *   };
  */
 struct pnfs_osd_ioerr {
 	struct pnfs_osd_objid	oer_component;
 	u64			oer_comp_offset;
 	u64			oer_comp_length;
 	u32			oer_iswrite;
 	u32			oer_errno;
 };

 /* OSD XDR Client API */
 /* Layout helpers */
 /* Layout decoding is done in two parts:
  * 1. First Call pnfs_osd_xdr_decode_layout_map to read in only the header part
  *    of the layout. @iter members need not be initialized.
  *    Returned:
  *             @layout members are set. (@layout->olo_comps set to NULL).
  *
  *             Zero on success, or negative error if passed xdr is broken.
  *
  * 2. 2nd Call pnfs_osd_xdr_decode_layout_comp() in a loop until it returns
  *    false, to decode the next component.
  *    Returned:
  *       true if there is more to decode or false if we are done or error.
  *
  * Example:
  *	struct pnfs_osd_xdr_decode_layout_iter iter;
  *	struct pnfs_osd_layout layout;
  *	struct pnfs_osd_object_cred comp;
  *	int status;
  *
  *	status = pnfs_osd_xdr_decode_layout_map(&layout, &iter, xdr);
  *	if (unlikely(status))
  *		goto err;
  *	while(pnfs_osd_xdr_decode_layout_comp(&comp, &iter, xdr, &status)) {
  *		// All of @comp strings point to inside the xdr_buffer
  *		// or scrach buffer. Copy them out to user memory eg.
  *		copy_single_comp(dest_comp++, &comp);
  *	}
  *	if (unlikely(status))
  *		goto err;
  */

 struct pnfs_osd_xdr_decode_layout_iter {
 	unsigned total_comps;
 	unsigned decoded_comps;
 };

 extern int pnfs_osd_xdr_decode_layout_map(struct pnfs_osd_layout *layout,
 	struct pnfs_osd_xdr_decode_layout_iter *iter, struct xdr_stream *xdr);

 extern bool pnfs_osd_xdr_decode_layout_comp(struct pnfs_osd_object_cred *comp,
 	struct pnfs_osd_xdr_decode_layout_iter *iter, struct xdr_stream *xdr,
 	int *err);

 /* Device Info helpers */

 /* Note: All strings inside @deviceaddr point to space inside @p.
  * @p should stay valid while @deviceaddr is in use.
  */
 extern void pnfs_osd_xdr_decode_deviceaddr(
 	struct pnfs_osd_deviceaddr *deviceaddr, __be32 *p);

 /* layoutupdate (layout_commit) xdr helpers */
 extern int
 pnfs_osd_xdr_encode_layoutupdate(struct xdr_stream *xdr,
 				 struct pnfs_osd_layoutupdate *lou);

 /* osd_ioerror encoding (layout_return) */
 extern __be32 *pnfs_osd_xdr_ioerr_reserve_space(struct xdr_stream *xdr);
 extern void pnfs_osd_xdr_encode_ioerr(__be32 *p, struct pnfs_osd_ioerr *ioerr);

 #endif /* __PNFS_OSD_XDR_H__ */
	/*
	* pNFS-osd on-the-wire data structures
	*
	* Copyright (C) 2007 Panasas Inc. [year of first publication]
	* All rights reserved.
	*
	* Benny Halevy <bhalevy@panasas.com>
	* Boaz Harrosh <ooo@electrozaur.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
	* See the file COPYING included with this distribution for more details.
	*
	* Redistribution and use in source and binary forms, with or without
	* modification, are permitted provided that the following conditions
	* are met:
	*
	* 1. Redistributions of source code must retain the above copyright
	* notice, this list of conditions and the following disclaimer.
	* 2. Redistributions in binary form must reproduce the above copyright
	* notice, this list of conditions and the following disclaimer in the
	* documentation and/or other materials provided with the distribution.
	* 3. Neither the name of the Panasas company nor the names of its
	* contributors may be used to endorse or promote products derived
	* from this software without specific prior written permission.
	*
	* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
	* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
	* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
	* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
	* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
	* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
	* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
	* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
	* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
	* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	*/
	#ifndef __PNFS_OSD_XDR_H__
	#define __PNFS_OSD_XDR_H__

	#include <linux/nfs_fs.h>

	/*
	* draft-ietf-nfsv4-minorversion-22
	* draft-ietf-nfsv4-pnfs-obj-12
	*/

	/* Layout Structure */

	enum pnfs_osd_raid_algorithm4 {
	PNFS_OSD_RAID_0 = 1,
	PNFS_OSD_RAID_4 = 2,
	PNFS_OSD_RAID_5 = 3,
	PNFS_OSD_RAID_PQ = 4 /* Reed-Solomon P+Q */
	};

	/* struct pnfs_osd_data_map4 {
	* uint32_t odm_num_comps;
	* length4 odm_stripe_unit;
	* uint32_t odm_group_width;
	* uint32_t odm_group_depth;
	* uint32_t odm_mirror_cnt;
	* pnfs_osd_raid_algorithm4 odm_raid_algorithm;
	* };
	*/
	struct pnfs_osd_data_map {
	u32 odm_num_comps;
	u64 odm_stripe_unit;
	u32 odm_group_width;
	u32 odm_group_depth;
	u32 odm_mirror_cnt;
	u32 odm_raid_algorithm;
	};

	/* struct pnfs_osd_objid4 {
	* deviceid4 oid_device_id;
	* uint64_t oid_partition_id;
	* uint64_t oid_object_id;
	* };
	*/
	struct pnfs_osd_objid {
	struct nfs4_deviceid oid_device_id;
	u64 oid_partition_id;
	u64 oid_object_id;
	};

	/* For printout. I use:
	* kprint("dev(%llx:%llx)", _DEVID_LO(pointer), _DEVID_HI(pointer));
	* BE style
	*/
	#define _DEVID_LO(oid_device_id) \
	(unsigned long long)be64_to_cpup((__be64 *)(oid_device_id)->data)

	#define _DEVID_HI(oid_device_id) \
	(unsigned long long)be64_to_cpup(((__be64 *)(oid_device_id)->data) + 1)

	enum pnfs_osd_version {
	PNFS_OSD_MISSING = 0,
	PNFS_OSD_VERSION_1 = 1,
	PNFS_OSD_VERSION_2 = 2
	};

	struct pnfs_osd_opaque_cred {
	u32 cred_len;
	void *cred;
	};

	enum pnfs_osd_cap_key_sec {
	PNFS_OSD_CAP_KEY_SEC_NONE = 0,
	PNFS_OSD_CAP_KEY_SEC_SSV = 1,
	};

	/* struct pnfs_osd_object_cred4 {
	* pnfs_osd_objid4 oc_object_id;
	* pnfs_osd_version4 oc_osd_version;
	* pnfs_osd_cap_key_sec4 oc_cap_key_sec;
	* opaque oc_capability_key<>;
	* opaque oc_capability<>;
	* };
	*/
	struct pnfs_osd_object_cred {
	struct pnfs_osd_objid oc_object_id;
	u32 oc_osd_version;
	u32 oc_cap_key_sec;
	struct pnfs_osd_opaque_cred oc_cap_key;
	struct pnfs_osd_opaque_cred oc_cap;
	};

	/* struct pnfs_osd_layout4 {
	* pnfs_osd_data_map4 olo_map;
	* uint32_t olo_comps_index;
	* pnfs_osd_object_cred4 olo_components<>;
	* };
	*/
	struct pnfs_osd_layout {
	struct pnfs_osd_data_map olo_map;
	u32 olo_comps_index;
	u32 olo_num_comps;
	struct pnfs_osd_object_cred *olo_comps;
	};

	/* Device Address */
	enum pnfs_osd_targetid_type {
	OBJ_TARGET_ANON = 1,
	OBJ_TARGET_SCSI_NAME = 2,
	OBJ_TARGET_SCSI_DEVICE_ID = 3,
	};

	/* union pnfs_osd_targetid4 switch (pnfs_osd_targetid_type4 oti_type) {
	* case OBJ_TARGET_SCSI_NAME:
	* string oti_scsi_name<>;
	*
	* case OBJ_TARGET_SCSI_DEVICE_ID:
	* opaque oti_scsi_device_id<>;
	*
	* default:
	* void;
	* };
	*
	* union pnfs_osd_targetaddr4 switch (bool ota_available) {
	* case TRUE:
	* netaddr4 ota_netaddr;
	* case FALSE:
	* void;
	* };
	*
	* struct pnfs_osd_deviceaddr4 {
	* pnfs_osd_targetid4 oda_targetid;
	* pnfs_osd_targetaddr4 oda_targetaddr;
	* uint64_t oda_lun;
	* opaque oda_systemid<>;
	* pnfs_osd_object_cred4 oda_root_obj_cred;
	* opaque oda_osdname<>;
	* };
	*/
	struct pnfs_osd_targetid {
	u32 oti_type;
	struct nfs4_string oti_scsi_device_id;
	};

	/* struct netaddr4 {
	* // see struct rpcb in RFC1833
	* string r_netid<>; // network id
	* string r_addr<>; // universal address
	* };
	*/
	struct pnfs_osd_net_addr {
	struct nfs4_string r_netid;
	struct nfs4_string r_addr;
	};

	struct pnfs_osd_targetaddr {
	u32 ota_available;
	struct pnfs_osd_net_addr ota_netaddr;
	};

	struct pnfs_osd_deviceaddr {
	struct pnfs_osd_targetid oda_targetid;
	struct pnfs_osd_targetaddr oda_targetaddr;
	u8 oda_lun[8];
	struct nfs4_string oda_systemid;
	struct pnfs_osd_object_cred oda_root_obj_cred;
	struct nfs4_string oda_osdname;
	};

	/* LAYOUTCOMMIT: layoutupdate */

	/* union pnfs_osd_deltaspaceused4 switch (bool dsu_valid) {
	* case TRUE:
	* int64_t dsu_delta;
	* case FALSE:
	* void;
	* };
	*
	* struct pnfs_osd_layoutupdate4 {
	* pnfs_osd_deltaspaceused4 olu_delta_space_used;
	* bool olu_ioerr_flag;
	* };
	*/
	struct pnfs_osd_layoutupdate {
	u32 dsu_valid;
	s64 dsu_delta;
	u32 olu_ioerr_flag;
	};

	/* LAYOUTRETURN: I/O Rrror Report */

	enum pnfs_osd_errno {
	PNFS_OSD_ERR_EIO = 1,
	PNFS_OSD_ERR_NOT_FOUND = 2,
	PNFS_OSD_ERR_NO_SPACE = 3,
	PNFS_OSD_ERR_BAD_CRED = 4,
	PNFS_OSD_ERR_NO_ACCESS = 5,
	PNFS_OSD_ERR_UNREACHABLE = 6,
	PNFS_OSD_ERR_RESOURCE = 7
	};

	/* struct pnfs_osd_ioerr4 {
	* pnfs_osd_objid4 oer_component;
	* length4 oer_comp_offset;
	* length4 oer_comp_length;
	* bool oer_iswrite;
	* pnfs_osd_errno4 oer_errno;
	* };
	*/
	struct pnfs_osd_ioerr {
	struct pnfs_osd_objid oer_component;
	u64 oer_comp_offset;
	u64 oer_comp_length;
	u32 oer_iswrite;
	u32 oer_errno;
	};

	/* OSD XDR Client API */
	/* Layout helpers */
	/* Layout decoding is done in two parts:
	* 1. First Call pnfs_osd_xdr_decode_layout_map to read in only the header part
	* of the layout. @iter members need not be initialized.
	* Returned:
	* @layout members are set. (@layout->olo_comps set to NULL).
	*
	* Zero on success, or negative error if passed xdr is broken.
	*
	* 2. 2nd Call pnfs_osd_xdr_decode_layout_comp() in a loop until it returns
	* false, to decode the next component.
	* Returned:
	* true if there is more to decode or false if we are done or error.
	*
	* Example:
	* struct pnfs_osd_xdr_decode_layout_iter iter;
	* struct pnfs_osd_layout layout;
	* struct pnfs_osd_object_cred comp;
	* int status;
	*
	* status = pnfs_osd_xdr_decode_layout_map(&layout, &iter, xdr);
	* if (unlikely(status))
	* goto err;
	* while(pnfs_osd_xdr_decode_layout_comp(&comp, &iter, xdr, &status)) {
	* // All of @comp strings point to inside the xdr_buffer
	* // or scrach buffer. Copy them out to user memory eg.
	* copy_single_comp(dest_comp++, &comp);
	* }
	* if (unlikely(status))
	* goto err;
	*/

	struct pnfs_osd_xdr_decode_layout_iter {
	unsigned total_comps;
	unsigned decoded_comps;
	};

	extern int pnfs_osd_xdr_decode_layout_map(struct pnfs_osd_layout *layout,
	struct pnfs_osd_xdr_decode_layout_iter iter, struct xdr_stream xdr);

	extern bool pnfs_osd_xdr_decode_layout_comp(struct pnfs_osd_object_cred *comp,
	struct pnfs_osd_xdr_decode_layout_iter iter, struct xdr_stream xdr,
	int *err);

	/* Device Info helpers */

	/* Note: All strings inside @deviceaddr point to space inside @p.
	* @p should stay valid while @deviceaddr is in use.
	*/
	extern void pnfs_osd_xdr_decode_deviceaddr(
	struct pnfs_osd_deviceaddr deviceaddr, __be32 p);

	/* layoutupdate (layout_commit) xdr helpers */
	extern int
	pnfs_osd_xdr_encode_layoutupdate(struct xdr_stream *xdr,
	struct pnfs_osd_layoutupdate *lou);

	/* osd_ioerror encoding (layout_return) */
	extern __be32 pnfs_osd_xdr_ioerr_reserve_space(struct xdr_stream xdr);
	extern void pnfs_osd_xdr_encode_ioerr(__be32 p, struct pnfs_osd_ioerr ioerr);

	#endif /* __PNFS_OSD_XDR_H__ */