forked from Minki/linux
126 lines
3.2 KiB
C
126 lines
3.2 KiB
C
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/*
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* Copyright (C) 2011
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* Boaz Harrosh <bharrosh@panasas.com>
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*
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* Public Declarations of the ORE API
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*
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* This file is part of the ORE (Object Raid Engine) library.
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*
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* ORE is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as published
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* by the Free Software Foundation. (GPL v2)
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*
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* ORE is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with the ORE; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef __ORE_H__
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#define __ORE_H__
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#include <scsi/osd_initiator.h>
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#include <scsi/osd_attributes.h>
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#include <scsi/osd_sec.h>
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#include <linux/pnfs_osd_xdr.h>
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struct ore_comp {
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struct osd_obj_id obj;
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u8 cred[OSD_CAP_LEN];
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};
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struct ore_layout {
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/* Our way of looking at the data_map */
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unsigned stripe_unit;
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unsigned mirrors_p1;
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unsigned group_width;
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u64 group_depth;
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unsigned group_count;
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};
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struct ore_components {
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unsigned numdevs; /* Num of devices in array */
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/* If @single_comp == EC_SINGLE_COMP, @comps points to a single
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* component. else there are @numdevs components
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*/
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enum EC_COMP_USAGE {
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EC_SINGLE_COMP = 0, EC_MULTPLE_COMPS = 0xffffffff
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} single_comp;
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struct ore_comp *comps;
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struct osd_dev **ods; /* osd_dev array */
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};
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struct ore_io_state;
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typedef void (*ore_io_done_fn)(struct ore_io_state *ios, void *private);
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struct ore_io_state {
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struct kref kref;
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void *private;
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ore_io_done_fn done;
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struct ore_layout *layout;
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struct ore_components *comps;
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/* Global read/write IO*/
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loff_t offset;
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unsigned long length;
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void *kern_buff;
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struct page **pages;
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unsigned nr_pages;
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unsigned pgbase;
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unsigned pages_consumed;
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/* Attributes */
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unsigned in_attr_len;
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struct osd_attr *in_attr;
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unsigned out_attr_len;
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struct osd_attr *out_attr;
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bool reading;
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/* Variable array of size numdevs */
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unsigned numdevs;
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struct ore_per_dev_state {
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struct osd_request *or;
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struct bio *bio;
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loff_t offset;
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unsigned length;
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unsigned dev;
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} per_dev[];
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};
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static inline unsigned ore_io_state_size(unsigned numdevs)
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{
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return sizeof(struct ore_io_state) +
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sizeof(struct ore_per_dev_state) * numdevs;
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}
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/* ore.c */
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int ore_get_rw_state(struct ore_layout *layout, struct ore_components *comps,
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bool is_reading, u64 offset, u64 length,
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struct ore_io_state **ios);
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int ore_get_io_state(struct ore_layout *layout, struct ore_components *comps,
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struct ore_io_state **ios);
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void ore_put_io_state(struct ore_io_state *ios);
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int ore_check_io(struct ore_io_state *ios, u64 *resid);
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int ore_create(struct ore_io_state *ios);
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int ore_remove(struct ore_io_state *ios);
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int ore_write(struct ore_io_state *ios);
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int ore_read(struct ore_io_state *ios);
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int ore_truncate(struct ore_layout *layout, struct ore_components *comps,
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u64 size);
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int extract_attr_from_ios(struct ore_io_state *ios, struct osd_attr *attr);
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extern const struct osd_attr g_attr_logical_length;
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#endif
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