80 lines
2.7 KiB
C
80 lines
2.7 KiB
C
/*
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* Copyright (C) from 2011
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* Boaz Harrosh <bharrosh@panasas.com>
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*
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* This file is part of the objects raid engine (ore).
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*
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* It 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.
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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 "ore". If not, write to the Free Software Foundation, Inc:
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* "Free Software Foundation <info@fsf.org>"
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*/
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#include <scsi/osd_ore.h>
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#define ORE_ERR(fmt, a...) printk(KERN_ERR "ore: " fmt, ##a)
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#ifdef CONFIG_EXOFS_DEBUG
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#define ORE_DBGMSG(fmt, a...) \
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printk(KERN_NOTICE "ore @%s:%d: " fmt, __func__, __LINE__, ##a)
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#else
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#define ORE_DBGMSG(fmt, a...) \
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do { if (0) printk(fmt, ##a); } while (0)
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#endif
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/* u64 has problems with printk this will cast it to unsigned long long */
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#define _LLU(x) (unsigned long long)(x)
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#define ORE_DBGMSG2(M...) do {} while (0)
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/* #define ORE_DBGMSG2 ORE_DBGMSG */
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/* Calculate the component order in a stripe. eg the logical data unit
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* address within the stripe of @dev given the @par_dev of this stripe.
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*/
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static inline unsigned _dev_order(unsigned devs_in_group, unsigned mirrors_p1,
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unsigned par_dev, unsigned dev)
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{
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unsigned first_dev = dev - dev % devs_in_group;
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dev -= first_dev;
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par_dev -= first_dev;
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if (devs_in_group == par_dev) /* The raid 0 case */
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return dev / mirrors_p1;
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/* raid4/5/6 case */
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return ((devs_in_group + dev - par_dev - mirrors_p1) % devs_in_group) /
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mirrors_p1;
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}
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/* ios_raid.c stuff needed by ios.c */
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int _ore_post_alloc_raid_stuff(struct ore_io_state *ios);
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void _ore_free_raid_stuff(struct ore_io_state *ios);
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void _ore_add_sg_seg(struct ore_per_dev_state *per_dev, unsigned cur_len,
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bool not_last);
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int _ore_add_parity_unit(struct ore_io_state *ios, struct ore_striping_info *si,
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struct ore_per_dev_state *per_dev, unsigned cur_len);
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void _ore_add_stripe_page(struct __stripe_pages_2d *sp2d,
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struct ore_striping_info *si, struct page *page);
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static inline void _add_stripe_page(struct __stripe_pages_2d *sp2d,
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struct ore_striping_info *si, struct page *page)
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{
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if (!sp2d) /* Inline the fast path */
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return; /* Hay no raid stuff */
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_ore_add_stripe_page(sp2d, si, page);
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}
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/* ios.c stuff needed by ios_raid.c */
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int _ore_get_io_state(struct ore_layout *layout,
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struct ore_components *oc, unsigned numdevs,
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unsigned sgs_per_dev, unsigned num_par_pages,
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struct ore_io_state **pios);
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int _ore_add_stripe_unit(struct ore_io_state *ios, unsigned *cur_pg,
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unsigned pgbase, struct page **pages,
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struct ore_per_dev_state *per_dev, int cur_len);
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int _ore_read_mirror(struct ore_io_state *ios, unsigned cur_comp);
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int ore_io_execute(struct ore_io_state *ios);
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