dm: improve bio splitting and associated IO accounting

[linux-2.6-microblaze.git] / drivers / md / dm-core.h

diff --git a/drivers/md/dm-core.h b/drivers/md/dm-core.h
index 8ba99ea..37ddedf 100644 (file)
--- a/drivers/md/dm-core.h
+++ b/drivers/md/dm-core.h
@@ -267,7 +267,12 @@ struct dm_io {
        blk_status_t status;
        atomic_t io_count;
        struct mapped_device *md;
+
+       /* The three fields represent mapped part of original bio */
        struct bio *orig_bio;
+       unsigned int sector_offset; /* offset to end of orig_bio */
+       unsigned int sectors;
+
        /* last member of dm_target_io is 'struct bio' */
        struct dm_target_io tio;
 };
@@ -277,7 +282,8 @@ struct dm_io {
  */
 enum {
        DM_IO_START_ACCT,
-       DM_IO_ACCOUNTED
+       DM_IO_ACCOUNTED,
+       DM_IO_WAS_SPLIT
 };
 
 static inline bool dm_io_flagged(struct dm_io *io, unsigned int bit)