Btrfs: Fix allocation routines to avoid intermixing data and metadata allocations

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

1 files changed, 3 insertions, 3 deletions

diff --git a/fs/btrfs/extent_map.c b/fs/btrfs/extent_map.c
index 7ef3397a266d..e241699024da 100644
--- a/fs/btrfs/extent_map.c
+++ b/fs/btrfs/extent_map.c
@@ -981,7 +981,7 @@ int find_first_extent_bit(struct extent_map_tree *tree, u64 start,
         struct extent_state *state;
         int ret = 1;
 
-        write_lock_irq(&tree->lock);
+        read_lock_irq(&tree->lock);
         /*
          * this search will find all the extents that end after
          * our range starts.
@@ -993,7 +993,7 @@ int find_first_extent_bit(struct extent_map_tree *tree, u64 start,
 
         while(1) {
                 state = rb_entry(node, struct extent_state, rb_node);
-                if (state->state & bits) {
+                if (state->end >= start && (state->state & bits)) {
                         *start_ret = state->start;
                         *end_ret = state->end;
                         ret = 0;
@@ -1004,7 +1004,7 @@ int find_first_extent_bit(struct extent_map_tree *tree, u64 start,
                         break;
         }
 out:
-        write_unlock_irq(&tree->lock);
+        read_unlock_irq(&tree->lock);
         return ret;
 }
 EXPORT_SYMBOL(find_first_extent_bit);