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TOMOYO Linux Cross Reference
Linux/include/scsi/osd_ore.h

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  1 /*
  2  * Copyright (C) 2011
  3  * Boaz Harrosh <ooo@electrozaur.com>
  4  *
  5  * Public Declarations of the ORE API
  6  *
  7  * This file is part of the ORE (Object Raid Engine) library.
  8  *
  9  * ORE is free software; you can redistribute it and/or modify
 10  * it under the terms of the GNU General Public License version 2 as published
 11  * by the Free Software Foundation. (GPL v2)
 12  *
 13  * ORE is distributed in the hope that it will be useful,
 14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 16  * GNU General Public License for more details.
 17  *
 18  * You should have received a copy of the GNU General Public License
 19  * along with the ORE; if not, write to the Free Software
 20  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 21  */
 22 #ifndef __ORE_H__
 23 #define __ORE_H__
 24 
 25 #include <scsi/osd_initiator.h>
 26 #include <scsi/osd_attributes.h>
 27 #include <scsi/osd_sec.h>
 28 #include <linux/pnfs_osd_xdr.h>
 29 #include <linux/bug.h>
 30 
 31 struct ore_comp {
 32         struct osd_obj_id       obj;
 33         u8                      cred[OSD_CAP_LEN];
 34 };
 35 
 36 struct ore_layout {
 37         /* Our way of looking at the data_map */
 38         enum pnfs_osd_raid_algorithm4
 39                  raid_algorithm;
 40         unsigned stripe_unit;
 41         unsigned mirrors_p1;
 42 
 43         unsigned group_width;
 44         unsigned parity;
 45         u64      group_depth;
 46         unsigned group_count;
 47 
 48         /* Cached often needed calculations filled in by
 49          * ore_verify_layout
 50          */
 51         unsigned long max_io_length;    /* Max length that should be passed to
 52                                          * ore_get_rw_state
 53                                          */
 54 };
 55 
 56 struct ore_dev {
 57         struct osd_dev *od;
 58 };
 59 
 60 struct ore_components {
 61         unsigned        first_dev;              /* First logical device no    */
 62         unsigned        numdevs;                /* Num of devices in array    */
 63         /* If @single_comp == EC_SINGLE_COMP, @comps points to a single
 64          * component. else there are @numdevs components
 65          */
 66         enum EC_COMP_USAGE {
 67                 EC_SINGLE_COMP = 0, EC_MULTPLE_COMPS = 0xffffffff
 68         }               single_comp;
 69         struct ore_comp *comps;
 70 
 71         /* Array of pointers to ore_dev-* . User will usually have these pointed
 72          * too a bigger struct which contain an "ore_dev ored" member and use
 73          * container_of(oc->ods[i], struct foo_dev, ored) to access the bigger
 74          * structure.
 75          */
 76         struct ore_dev  **ods;
 77 };
 78 
 79 /* ore_comp_dev Recievies a logical device index */
 80 static inline struct osd_dev *ore_comp_dev(
 81         const struct ore_components *oc, unsigned i)
 82 {
 83         BUG_ON((i < oc->first_dev) || (oc->first_dev + oc->numdevs <= i));
 84         return oc->ods[i - oc->first_dev]->od;
 85 }
 86 
 87 static inline void ore_comp_set_dev(
 88         struct ore_components *oc, unsigned i, struct osd_dev *od)
 89 {
 90         oc->ods[i - oc->first_dev]->od = od;
 91 }
 92 
 93 struct ore_striping_info {
 94         u64 offset;
 95         u64 obj_offset;
 96         u64 length;
 97         u64 first_stripe_start; /* only used in raid writes */
 98         u64 M; /* for truncate */
 99         unsigned bytes_in_stripe;
100         unsigned dev;
101         unsigned par_dev;
102         unsigned unit_off;
103         unsigned cur_pg;
104         unsigned cur_comp;
105         unsigned maxdevUnits;
106 };
107 
108 struct ore_io_state;
109 typedef void (*ore_io_done_fn)(struct ore_io_state *ios, void *private);
110 struct _ore_r4w_op {
111         /* @Priv given here is passed ios->private */
112         struct page * (*get_page)(void *priv, u64 page_index, bool *uptodate);
113         void (*put_page)(void *priv, struct page *page);
114 };
115 
116 struct ore_io_state {
117         struct kref             kref;
118         struct ore_striping_info si;
119 
120         void                    *private;
121         ore_io_done_fn  done;
122 
123         struct ore_layout       *layout;
124         struct ore_components   *oc;
125 
126         /* Global read/write IO*/
127         loff_t                  offset;
128         unsigned long           length;
129         void                    *kern_buff;
130 
131         struct page             **pages;
132         unsigned                nr_pages;
133         unsigned                pgbase;
134         unsigned                pages_consumed;
135 
136         /* Attributes */
137         unsigned                in_attr_len;
138         struct osd_attr         *in_attr;
139         unsigned                out_attr_len;
140         struct osd_attr         *out_attr;
141 
142         bool                    reading;
143 
144         /* House keeping of Parity pages */
145         bool                    extra_part_alloc;
146         struct page             **parity_pages;
147         unsigned                max_par_pages;
148         unsigned                cur_par_page;
149         unsigned                sgs_per_dev;
150         struct __stripe_pages_2d *sp2d;
151         struct ore_io_state      *ios_read_4_write;
152         const struct _ore_r4w_op *r4w;
153 
154         /* Variable array of size numdevs */
155         unsigned numdevs;
156         struct ore_per_dev_state {
157                 struct osd_request *or;
158                 struct bio *bio;
159                 loff_t offset;
160                 unsigned length;
161                 unsigned last_sgs_total;
162                 unsigned dev;
163                 struct osd_sg_entry *sglist;
164                 unsigned cur_sg;
165         } per_dev[];
166 };
167 
168 static inline unsigned ore_io_state_size(unsigned numdevs)
169 {
170         return sizeof(struct ore_io_state) +
171                 sizeof(struct ore_per_dev_state) * numdevs;
172 }
173 
174 /* ore.c */
175 int ore_verify_layout(unsigned total_comps, struct ore_layout *layout);
176 void ore_calc_stripe_info(struct ore_layout *layout, u64 file_offset,
177                           u64 length, struct ore_striping_info *si);
178 int ore_get_rw_state(struct ore_layout *layout, struct ore_components *comps,
179                      bool is_reading, u64 offset, u64 length,
180                      struct ore_io_state **ios);
181 int ore_get_io_state(struct ore_layout *layout, struct ore_components *comps,
182                      struct ore_io_state **ios);
183 void ore_put_io_state(struct ore_io_state *ios);
184 
185 typedef void (*ore_on_dev_error)(struct ore_io_state *ios, struct ore_dev *od,
186         unsigned dev_index, enum osd_err_priority oep,
187         u64 dev_offset, u64  dev_len);
188 int ore_check_io(struct ore_io_state *ios, ore_on_dev_error rep);
189 
190 int ore_create(struct ore_io_state *ios);
191 int ore_remove(struct ore_io_state *ios);
192 int ore_write(struct ore_io_state *ios);
193 int ore_read(struct ore_io_state *ios);
194 int ore_truncate(struct ore_layout *layout, struct ore_components *comps,
195                  u64 size);
196 
197 int extract_attr_from_ios(struct ore_io_state *ios, struct osd_attr *attr);
198 
199 extern const struct osd_attr g_attr_logical_length;
200 
201 #endif
202 

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