ore/exofs: Define new ore_verify_layout

All users of the ore will need to check if current code
supports the given layout. For example RAID5/6 is not
currently supported.

So move all the checks from exofs/super.c to a new
ore_verify_layout() to be used by ore users.

Note that any new layout should be passed through the
ore_verify_layout() because the ore engine will prepare
and verify some internal members of ore_layout, and
assumes it's called.

Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>

1 files changed, 8 insertions, 0 deletions

diff --git a/include/scsi/osd_ore.h b/include/scsi/osd_ore.h
index 492b70d43bb6..716dbeae8cd2 100644
--- a/include/scsi/osd_ore.h
+++ b/include/scsi/osd_ore.h
@@ -42,6 +42,13 @@ struct ore_layout {
         unsigned group_width;
         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 {
@@ -138,6 +145,7 @@ static inline unsigned ore_io_state_size(unsigned numdevs)
 }
 
 /* ore.c */
+int ore_verify_layout(unsigned total_comps, struct ore_layout *layout);
 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);