Fix btrfs_get_extent and get_block corner cases, and disable O_DIRECT reads

The generic O_DIRECT code assumes all the bios have the same bdev,
which isn't true for multi-device btrfs.

Signed-off-by: Chris Mason <chris.mason@oracle.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index 5619e50583e3..bccb5566fd84 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -1161,7 +1161,6 @@ int btrfs_map_bio(struct btrfs_root *root, int rw, struct bio *bio,
         int total_devs = 1;
 
         length = bio->bi_size;
-
         map_tree = &root->fs_info->mapping_tree;
         map_length = length;
 
@@ -1192,6 +1191,7 @@ int btrfs_map_bio(struct btrfs_root *root, int rw, struct bio *bio,
                 }
                 bio->bi_sector = multi->stripes[dev_nr].physical >> 9;
                 dev = multi->stripes[dev_nr].dev;
+
                 bio->bi_bdev = dev->bdev;
                 spin_lock(&dev->io_lock);
                 dev->total_ios++;