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Diffstat (limited to 'kernel/include/scsi/osd_ore.h')
| -rw-r--r-- | kernel/include/scsi/osd_ore.h | 201 |
1 files changed, 201 insertions, 0 deletions
diff --git a/kernel/include/scsi/osd_ore.h b/kernel/include/scsi/osd_ore.h new file mode 100644 index 000000000..7a8d2cd30 --- /dev/null +++ b/kernel/include/scsi/osd_ore.h @@ -0,0 +1,201 @@ +/* + * Copyright (C) 2011 + * Boaz Harrosh <ooo@electrozaur.com> + * + * Public Declarations of the ORE API + * + * This file is part of the ORE (Object Raid Engine) library. + * + * ORE 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. (GPL v2) + * + * ORE is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with the ORE; if not, write to the Free Software + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + */ +#ifndef __ORE_H__ +#define __ORE_H__ + +#include <scsi/osd_initiator.h> +#include <scsi/osd_attributes.h> +#include <scsi/osd_sec.h> +#include <linux/pnfs_osd_xdr.h> +#include <linux/bug.h> + +struct ore_comp { + struct osd_obj_id obj; + u8 cred[OSD_CAP_LEN]; +}; + +struct ore_layout { + /* Our way of looking at the data_map */ + enum pnfs_osd_raid_algorithm4 + raid_algorithm; + unsigned stripe_unit; + unsigned mirrors_p1; + + unsigned group_width; + unsigned parity; + u64 group_depth; + unsigned group_count; + + /* Cached often needed calculations filled in by + * ore_verify_layout + */ + unsigned long max_io_length; /* Max length that should be passed to + * ore_get_rw_state + */ +}; + +struct ore_dev { + struct osd_dev *od; +}; + +struct ore_components { + unsigned first_dev; /* First logical device no */ + unsigned numdevs; /* Num of devices in array */ + /* If @single_comp == EC_SINGLE_COMP, @comps points to a single + * component. else there are @numdevs components + */ + enum EC_COMP_USAGE { + EC_SINGLE_COMP = 0, EC_MULTPLE_COMPS = 0xffffffff + } single_comp; + struct ore_comp *comps; + + /* Array of pointers to ore_dev-* . User will usually have these pointed + * too a bigger struct which contain an "ore_dev ored" member and use + * container_of(oc->ods[i], struct foo_dev, ored) to access the bigger + * structure. + */ + struct ore_dev **ods; +}; + +/* ore_comp_dev Recievies a logical device index */ +static inline struct osd_dev *ore_comp_dev( + const struct ore_components *oc, unsigned i) +{ + BUG_ON((i < oc->first_dev) || (oc->first_dev + oc->numdevs <= i)); + return oc->ods[i - oc->first_dev]->od; +} + +static inline void ore_comp_set_dev( + struct ore_components *oc, unsigned i, struct osd_dev *od) +{ + oc->ods[i - oc->first_dev]->od = od; +} + +struct ore_striping_info { + u64 offset; + u64 obj_offset; + u64 length; + u64 first_stripe_start; /* only used in raid writes */ + u64 M; /* for truncate */ + unsigned bytes_in_stripe; + unsigned dev; + unsigned par_dev; + unsigned unit_off; + unsigned cur_pg; + unsigned cur_comp; + unsigned maxdevUnits; +}; + +struct ore_io_state; +typedef void (*ore_io_done_fn)(struct ore_io_state *ios, void *private); +struct _ore_r4w_op { + /* @Priv given here is passed ios->private */ + struct page * (*get_page)(void *priv, u64 page_index, bool *uptodate); + void (*put_page)(void *priv, struct page *page); +}; + +struct ore_io_state { + struct kref kref; + struct ore_striping_info si; + + void *private; + ore_io_done_fn done; + + struct ore_layout *layout; + struct ore_components *oc; + + /* Global read/write IO*/ + loff_t offset; + unsigned long length; + void *kern_buff; + + struct page **pages; + unsigned nr_pages; + unsigned pgbase; + unsigned pages_consumed; + + /* Attributes */ + unsigned in_attr_len; + struct osd_attr *in_attr; + unsigned out_attr_len; + struct osd_attr *out_attr; + + bool reading; + + /* House keeping of Parity pages */ + bool extra_part_alloc; + struct page **parity_pages; + unsigned max_par_pages; + unsigned cur_par_page; + unsigned sgs_per_dev; + struct __stripe_pages_2d *sp2d; + struct ore_io_state *ios_read_4_write; + const struct _ore_r4w_op *r4w; + + /* Variable array of size numdevs */ + unsigned numdevs; + struct ore_per_dev_state { + struct osd_request *or; + struct bio *bio; + loff_t offset; + unsigned length; + unsigned last_sgs_total; + unsigned dev; + struct osd_sg_entry *sglist; + unsigned cur_sg; + } per_dev[]; +}; + +static inline unsigned ore_io_state_size(unsigned numdevs) +{ + return sizeof(struct ore_io_state) + + sizeof(struct ore_per_dev_state) * numdevs; +} + +/* ore.c */ +int ore_verify_layout(unsigned total_comps, struct ore_layout *layout); +void ore_calc_stripe_info(struct ore_layout *layout, u64 file_offset, + u64 length, struct ore_striping_info *si); +int ore_get_rw_state(struct ore_layout *layout, struct ore_components *comps, + bool is_reading, u64 offset, u64 length, + struct ore_io_state **ios); +int ore_get_io_state(struct ore_layout *layout, struct ore_components *comps, + struct ore_io_state **ios); +void ore_put_io_state(struct ore_io_state *ios); + +typedef void (*ore_on_dev_error)(struct ore_io_state *ios, struct ore_dev *od, + unsigned dev_index, enum osd_err_priority oep, + u64 dev_offset, u64 dev_len); +int ore_check_io(struct ore_io_state *ios, ore_on_dev_error rep); + +int ore_create(struct ore_io_state *ios); +int ore_remove(struct ore_io_state *ios); +int ore_write(struct ore_io_state *ios); +int ore_read(struct ore_io_state *ios); +int ore_truncate(struct ore_layout *layout, struct ore_components *comps, + u64 size); + +int extract_attr_from_ios(struct ore_io_state *ios, struct osd_attr *attr); + +extern const struct osd_attr g_attr_logical_length; + +#endif |