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>

1 files changed, 5 insertions, 2 deletions

diff --git a/fs/btrfs/free-space-cache.c b/fs/btrfs/free-space-cache.c
index 35bfc13c9d42..abc924c9467c 100644
--- 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);