Btrfs: don't split dio bios if we don't have to

We have been unconditionally allocating a new bio and re-adding all pages from
our original bio to the new bio.  This is needed if our original bio is larger
than our stripe size, but if it is smaller than the stripe size then there is no
need to do this.  So check the map length and if we are under that then go ahead
and submit the original bio.  Thanks,

Signed-off-by: Josef Bacik <josef@redhat.com>

diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 4a238d676e5b3a5ce1c529ab792013a20db625d6..149c77fd1eb54d35346531cec5e021269f037f14 100644 (file)
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -6006,13 +6006,6 @@ static int btrfs_submit_direct_hook(int rw, struct btrfs_dio_private *dip,
        int ret = 0;
        int write = rw & REQ_WRITE;
 
-       bio = btrfs_dio_bio_alloc(orig_bio->bi_bdev, start_sector, GFP_NOFS);
-       if (!bio)
-               return -ENOMEM;
-       bio->bi_private = dip;
-       bio->bi_end_io = btrfs_end_dio_bio;
-       atomic_inc(&dip->pending_bios);
-
        map_length = orig_bio->bi_size;
        ret = btrfs_map_block(map_tree, READ, start_sector << 9,
                              &map_length, NULL, 0);
@@ -6021,6 +6014,18 @@ static int btrfs_submit_direct_hook(int rw, struct btrfs_dio_private *dip,
                return -EIO;
        }
 
+       if (map_length >= orig_bio->bi_size) {
+               bio = orig_bio;
+               goto submit;
+       }
+
+       bio = btrfs_dio_bio_alloc(orig_bio->bi_bdev, start_sector, GFP_NOFS);
+       if (!bio)
+               return -ENOMEM;
+       bio->bi_private = dip;
+       bio->bi_end_io = btrfs_end_dio_bio;
+       atomic_inc(&dip->pending_bios);
+
        while (bvec <= (orig_bio->bi_io_vec + orig_bio->bi_vcnt - 1)) {
                if (unlikely(map_length < submit_len + bvec->bv_len ||
                    bio_add_page(bio, bvec->bv_page, bvec->bv_len,
@@ -6071,6 +6076,7 @@ static int btrfs_submit_direct_hook(int rw, struct btrfs_dio_private *dip,
                }
        }
 
+submit:
        ret = __btrfs_submit_dio_bio(bio, inode, rw, file_offset, skip_sum,
                                     csums);
        if (!ret)