diff options
Diffstat (limited to 'fs/exofs/ore_raid.h')
-rw-r--r-- | fs/exofs/ore_raid.h | 64 |
1 files changed, 64 insertions, 0 deletions
diff --git a/fs/exofs/ore_raid.h b/fs/exofs/ore_raid.h new file mode 100644 index 00000000000..c21080b4407 --- /dev/null +++ b/fs/exofs/ore_raid.h @@ -0,0 +1,64 @@ +/* + * Copyright (C) from 2011 + * Boaz Harrosh <bharrosh@panasas.com> + * + * This file is part of the objects raid engine (ore). + * + * It is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as published + * by the Free Software Foundation. + * + * You should have received a copy of the GNU General Public License + * along with "ore". If not, write to the Free Software Foundation, Inc: + * "Free Software Foundation <info@fsf.org>" + */ + +#include <scsi/osd_ore.h> + +#define ORE_ERR(fmt, a...) printk(KERN_ERR "ore: " fmt, ##a) + +#ifdef CONFIG_EXOFS_DEBUG +#define ORE_DBGMSG(fmt, a...) \ + printk(KERN_NOTICE "ore @%s:%d: " fmt, __func__, __LINE__, ##a) +#else +#define ORE_DBGMSG(fmt, a...) \ + do { if (0) printk(fmt, ##a); } while (0) +#endif + +/* u64 has problems with printk this will cast it to unsigned long long */ +#define _LLU(x) (unsigned long long)(x) + +#define ORE_DBGMSG2(M...) do {} while (0) +/* #define ORE_DBGMSG2 ORE_DBGMSG */ + +/* Calculate the component order in a stripe. eg the logical data unit + * address within the stripe of @dev given the @par_dev of this stripe. + */ +static inline unsigned _dev_order(unsigned devs_in_group, unsigned mirrors_p1, + unsigned par_dev, unsigned dev) +{ + unsigned first_dev = dev - dev % devs_in_group; + + dev -= first_dev; + par_dev -= first_dev; + + if (devs_in_group == par_dev) /* The raid 0 case */ + return dev / mirrors_p1; + /* raid4/5/6 case */ + return ((devs_in_group + dev - par_dev - mirrors_p1) % devs_in_group) / + mirrors_p1; +} + +/* ios_raid.c stuff needed by ios.c */ +int _ore_post_alloc_raid_stuff(struct ore_io_state *ios); +void _ore_free_raid_stuff(struct ore_io_state *ios); + +void _ore_add_sg_seg(struct ore_per_dev_state *per_dev, unsigned cur_len, + bool not_last); +int _ore_add_parity_unit(struct ore_io_state *ios, struct ore_striping_info *si, + struct ore_per_dev_state *per_dev, unsigned cur_len); + +/* ios.c stuff needed by ios_raid.c */ +int _ore_add_stripe_unit(struct ore_io_state *ios, unsigned *cur_pg, + unsigned pgbase, struct page **pages, + struct ore_per_dev_state *per_dev, int cur_len); |