Btrfs: use the global reserve when truncating the free space cache inode

We no longer use the orphan block rsv for holding the reservation for truncating
the inode, so instead use the global block rsv and check to make sure it has
enough space for us to truncate the space.  Thanks,

Signed-off-by: Josef Bacik <josef@redhat.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>

diff --git a/fs/btrfs/free-space-cache.c b/fs/btrfs/free-space-cache.c
index f49475dfa954a625409322a4c84a157ee3a209ae..7a15fcfb3e1fb688f49d0691544a72581a328fa3 100644 (file)
--- a/fs/btrfs/free-space-cache.c
+++ b/fs/btrfs/free-space-cache.c
@@ -198,14 +198,24 @@ int btrfs_truncate_free_space_cache(struct btrfs_root *root,
                                    struct inode *inode)
 {
        struct btrfs_block_rsv *rsv;
+       u64 needed_bytes;
        loff_t oldsize;
        int ret = 0;
 
        rsv = trans->block_rsv;
-       trans->block_rsv = root->orphan_block_rsv;
-       ret = btrfs_block_rsv_check(root, root->orphan_block_rsv, 5);
-       if (ret)
-               return ret;
+       trans->block_rsv = &root->fs_info->global_block_rsv;
+
+       /* 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);
 
        oldsize = i_size_read(inode);
        btrfs_i_size_write(inode, 0);
@@ -218,13 +228,15 @@ int btrfs_truncate_free_space_cache(struct btrfs_root *root,
        ret = btrfs_truncate_inode_items(trans, root, inode,
                                         0, BTRFS_EXTENT_DATA_KEY);
 
-       trans->block_rsv = rsv;
        if (ret) {
+               trans->block_rsv = rsv;
                WARN_ON(1);
                return ret;
        }
 
        ret = btrfs_update_inode(trans, root, inode);
+       trans->block_rsv = rsv;
+
        return ret;
 }