1 files changed, 20 insertions, 23 deletions

diff --git a/fs/btrfs/free-space-cache.c b/fs/btrfs/free-space-cache.c
index ecca6c7375a6..e53009657f0e 100644
--- a/fs/btrfs/free-space-cache.c
+++ b/fs/btrfs/free-space-cache.c
@@ -197,30 +197,32 @@ int create_free_space_inode(struct btrfs_root *root,
                                          block_group->key.objectid);
 }
 
-int btrfs_truncate_free_space_cache(struct btrfs_root *root,
-                                    struct btrfs_trans_handle *trans,
-                                    struct btrfs_path *path,
-                                    struct inode *inode)
+int btrfs_check_trunc_cache_free_space(struct btrfs_root *root,
+                                       struct btrfs_block_rsv *rsv)
 {
-        struct btrfs_block_rsv *rsv;
         u64 needed_bytes;
-        loff_t oldsize;
-        int ret = 0;
-
-        rsv = trans->block_rsv;
-        trans->block_rsv = &root->fs_info->global_block_rsv;
+        int ret;
 
         /* 1 for slack space, 1 for updating the inode */
         needed_bytes = btrfs_calc_trunc_metadata_size(root, 1) +
                 btrfs_calc_trans_metadata_size(root, 1);
 
-        spin_lock(&trans->block_rsv->lock);
-        if (trans->block_rsv->reserved < needed_bytes) {
-                spin_unlock(&trans->block_rsv->lock);
-                trans->block_rsv = rsv;
-                return -ENOSPC;
-        }
-        spin_unlock(&trans->block_rsv->lock);
+        spin_lock(&rsv->lock);
+        if (rsv->reserved < needed_bytes)
+                ret = -ENOSPC;
+        else
+                ret = 0;
+        spin_unlock(&rsv->lock);
+        return 0;
+}
+
+int btrfs_truncate_free_space_cache(struct btrfs_root *root,
+                                    struct btrfs_trans_handle *trans,
+                                    struct btrfs_path *path,
+                                    struct inode *inode)
+{
+        loff_t oldsize;
+        int ret = 0;
 
         oldsize = i_size_read(inode);
         btrfs_i_size_write(inode, 0);
@@ -232,9 +234,7 @@ int btrfs_truncate_free_space_cache(struct btrfs_root *root,
          */
         ret = btrfs_truncate_inode_items(trans, root, inode,
                                          0, BTRFS_EXTENT_DATA_KEY);
-
         if (ret) {
-                trans->block_rsv = rsv;
                 btrfs_abort_transaction(trans, root, ret);
                 return ret;
         }
@@ -242,7 +242,6 @@ int btrfs_truncate_free_space_cache(struct btrfs_root *root,
         ret = btrfs_update_inode(trans, root, inode);
         if (ret)
                 btrfs_abort_transaction(trans, root, ret);
-        trans->block_rsv = rsv;
 
         return ret;
 }
@@ -920,10 +919,8 @@ static int __btrfs_write_out_cache(struct btrfs_root *root, struct inode *inode,
 
         /* Make sure we can fit our crcs into the first page */
         if (io_ctl.check_crcs &&
-            (io_ctl.num_pages * sizeof(u32)) >= PAGE_CACHE_SIZE) {
-                WARN_ON(1);
+            (io_ctl.num_pages * sizeof(u32)) >= PAGE_CACHE_SIZE)
                 goto out_nospc;
-        }
 
         io_ctl_set_generation(&io_ctl, trans->transid);