Merge git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6

[~andy/linux] / fs / btrfs / extent-tree.c

diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index bf7782fc59399f03db5d598232ad2060faa6380a..e238a0cdac677c06b1774018bf549b03399da4c8 100644 (file)
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -1568,18 +1568,16 @@ static int remove_extent_backref(struct btrfs_trans_handle *trans,
        return ret;
 }
 
-#ifdef BIO_RW_DISCARD
 static void btrfs_issue_discard(struct block_device *bdev,
                                u64 start, u64 len)
 {
-       blkdev_issue_discard(bdev, start >> 9, len >> 9, GFP_KERNEL);
+       blkdev_issue_discard(bdev, start >> 9, len >> 9, GFP_KERNEL,
+                            DISCARD_FL_BARRIER);
 }
-#endif
 
 static int btrfs_discard_extent(struct btrfs_root *root, u64 bytenr,
                                u64 num_bytes)
 {
-#ifdef BIO_RW_DISCARD
        int ret;
        u64 map_length = num_bytes;
        struct btrfs_multi_bio *multi = NULL;
@@ -1606,9 +1604,6 @@ static int btrfs_discard_extent(struct btrfs_root *root, u64 bytenr,
        }
 
        return ret;
-#else
-       return 0;
-#endif
 }
 
 int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
@@ -3692,6 +3687,14 @@ static int pin_down_bytes(struct btrfs_trans_handle *trans,
        if (is_data)
                goto pinit;
 
+       /*
+        * discard is sloooow, and so triggering discards on
+        * individual btree blocks isn't a good plan.  Just
+        * pin everything in discard mode.
+        */
+       if (btrfs_test_opt(root, DISCARD))
+               goto pinit;
+
        buf = btrfs_find_tree_block(root, bytenr, num_bytes);
        if (!buf)
                goto pinit;