xfs: return corresponding errcode if xfs_initialize_perag() fail

In xfs_initialize_perag(), if kmem_zalloc(), xfs_buf_hash_init(), or
radix_tree_preload() failed, the returned value 'error' is not set
accordingly.

Reported-as-fixing: 8b26c5825e02 ("xfs: handle ENOMEM correctly during initialisation of perag structures")
Fixes: 9b2471797942 ("xfs: cache unlinked pointers in an rhashtable")
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Yu Kuai <yukuai3@huawei.com>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>

diff --git a/fs/xfs/xfs_mount.c b/fs/xfs/xfs_mount.c
index 150ee5c..7110507 100644 (file)
--- a/fs/xfs/xfs_mount.c
+++ b/fs/xfs/xfs_mount.c
@@ -194,20 +194,25 @@ xfs_initialize_perag(
                }
 
                pag = kmem_zalloc(sizeof(*pag), KM_MAYFAIL);
-               if (!pag)
+               if (!pag) {
+                       error = -ENOMEM;
                        goto out_unwind_new_pags;
+               }
                pag->pag_agno = index;
                pag->pag_mount = mp;
                spin_lock_init(&pag->pag_ici_lock);
                INIT_RADIX_TREE(&pag->pag_ici_root, GFP_ATOMIC);
-               if (xfs_buf_hash_init(pag))
+
+               error = xfs_buf_hash_init(pag);
+               if (error)
                        goto out_free_pag;
                init_waitqueue_head(&pag->pagb_wait);
                spin_lock_init(&pag->pagb_lock);
                pag->pagb_count = 0;
                pag->pagb_tree = RB_ROOT;
 
-               if (radix_tree_preload(GFP_NOFS))
+               error = radix_tree_preload(GFP_NOFS);
+               if (error)
                        goto out_hash_destroy;
 
                spin_lock(&mp->m_perag_lock);