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Users like the objlayout-driver would like to only pass a partial device table that covers the IO in question. For example exofs divides the file into raid-group-sized chunks and only serves group_width number of devices at a time. The partiality is communicated by setting ore_componets->first_dev and the array covers all logical devices from oc->first_dev upto (oc->first_dev + oc->numdevs) The ore_comp_dev() API receives a logical device index and returns the actual present device in the table. An out-of-range dev_index will BUG. Logical device index is the theoretical device index as if all the devices of a file are present. .i.e: total_devs = group_width * mirror_p1 * group_count 0 <= dev_index < total_devs Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
162 lines
4.1 KiB
C
162 lines
4.1 KiB
C
/*
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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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enum pnfs_osd_raid_algorithm4
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raid_algorithm;
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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_dev {
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struct osd_dev *od;
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};
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struct ore_components {
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unsigned first_dev; /* First logical device no */
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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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/* Array of pointers to ore_dev-* . User will usually have these pointed
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* too a bigger struct which contain an "ore_dev ored" member and use
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* container_of(oc->ods[i], struct foo_dev, ored) to access the bigger
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* structure.
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*/
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struct ore_dev **ods;
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};
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/* ore_comp_dev Recievies a logical device index */
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static inline struct osd_dev *ore_comp_dev(
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const struct ore_components *oc, unsigned i)
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{
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BUG_ON((i < oc->first_dev) || (oc->first_dev + oc->numdevs <= i));
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return oc->ods[i - oc->first_dev]->od;
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}
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static inline void ore_comp_set_dev(
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struct ore_components *oc, unsigned i, struct osd_dev *od)
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{
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oc->ods[i - oc->first_dev]->od = od;
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}
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struct ore_striping_info {
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u64 obj_offset;
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u64 group_length;
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u64 M; /* for truncate */
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unsigned dev;
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unsigned unit_off;
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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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struct ore_striping_info si;
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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 *oc;
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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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