ore: RAID5 read
[linux-3.10.git] / include / scsi / osd_ore.h
index a8e39d1..43821c1 100644 (file)
@@ -40,6 +40,7 @@ struct ore_layout {
        unsigned mirrors_p1;
 
        unsigned group_width;
+       unsigned parity;
        u64      group_depth;
        unsigned group_count;
 
@@ -89,11 +90,16 @@ static inline void ore_comp_set_dev(
 }
 
 struct ore_striping_info {
+       u64 offset;
        u64 obj_offset;
-       u64 group_length;
+       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_comp;
 };
 
 struct ore_io_state;
@@ -127,6 +133,13 @@ struct ore_io_state {
 
        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;
+
        /* Variable array of size numdevs */
        unsigned numdevs;
        struct ore_per_dev_state {
@@ -134,7 +147,10 @@ struct ore_io_state {
                struct bio *bio;
                loff_t offset;
                unsigned length;
+               unsigned last_sgs_total;
                unsigned dev;
+               struct osd_sg_entry *sglist;
+               unsigned cur_sg;
        } per_dev[];
 };
 
@@ -147,8 +163,7 @@ static inline unsigned ore_io_state_size(unsigned 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,
-                         struct ore_striping_info *si);
-
+                         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);