Btrfs: check the return value of filemap_write_and_wait in the space cache

We need to check the return value of filemap_write_and_wait in the space cache
writeout code.  Also don't set the inode's generation until we're sure nothing
else is going to fail.  Thanks,

Signed-off-by: Josef Bacik <josef@redhat.com>

diff --git a/fs/btrfs/free-space-cache.c b/fs/btrfs/free-space-cache.c
index 35bfc13c9d423169dbb559798e1fdb06738e803c..abc924c9467cd596fc53da8612c1783068162ffd 100644 (file)
--- a/fs/btrfs/free-space-cache.c
+++ b/fs/btrfs/free-space-cache.c
@@ -852,9 +852,10 @@ int __btrfs_write_out_cache(struct btrfs_root *root, struct inode *inode,
        if (ret)
                goto out;
 
-       BTRFS_I(inode)->generation = trans->transid;
 
-       filemap_write_and_wait(inode->i_mapping);
+       ret = filemap_write_and_wait(inode->i_mapping);
+       if (ret)
+               goto out;
 
        key.objectid = BTRFS_FREE_SPACE_OBJECTID;
        key.offset = offset;
@@ -884,6 +885,8 @@ int __btrfs_write_out_cache(struct btrfs_root *root, struct inode *inode,
                        goto out;
                }
        }
+
+       BTRFS_I(inode)->generation = trans->transid;
        header = btrfs_item_ptr(leaf, path->slots[0],
                                struct btrfs_free_space_header);
        btrfs_set_free_space_entries(leaf, header, entries);