f2fs: invalidate the node page if allocation is failed

The new_node_page() is processed as the following procedure.

1. A new node page is allocated.
2. Set PageUptodate with proper footer information.
3. Check if there is a free space for allocation
 4.a. If there is no space, f2fs returns with -ENOSPC.
 4.b. Otherwise, go next.

In the case of step #4.a, f2fs remains a wrong node page in the page cache
with the uptodate flag.

Also, even though a new node page is allocated successfully, an error can be
occurred afterwards due to allocation failure of the other data structures.
In such a case, remove_inode_page() would be triggered, so that we have to
clear uptodate flag in truncate_node() too.

So, we should remove the uptodate flag, if allocation is failed.

Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>

1 files changed, 12 insertions, 17 deletions

diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c
index dffac1c11f63..e85643cc74a9 100644
--- a/fs/f2fs/node.c
+++ b/fs/f2fs/node.c
@@ -484,12 +484,14 @@ static void truncate_node(struct dnode_of_data *dn)
         struct node_info ni;
 
         get_node_info(sbi, dn->nid, &ni);
+        if (dn->inode->i_blocks == 0) {
+                BUG_ON(ni.blk_addr != NULL_ADDR);
+                goto invalidate;
+        }
         BUG_ON(ni.blk_addr == NULL_ADDR);
 
-        if (ni.blk_addr != NULL_ADDR)
-                invalidate_blocks(sbi, ni.blk_addr);
-
         /* Deallocate node address */
+        invalidate_blocks(sbi, ni.blk_addr);
         dec_valid_node_count(sbi, dn->inode, 1);
         set_node_addr(sbi, &ni, NULL_ADDR);
 
@@ -499,7 +501,7 @@ static void truncate_node(struct dnode_of_data *dn)
         } else {
                 sync_inode_page(dn);
         }
-
+invalidate:
         clear_node_page_dirty(dn->node_page);
         F2FS_SET_SB_DIRT(sbi);
 
@@ -768,20 +770,12 @@ int remove_inode_page(struct inode *inode)
                 dn.inode_page_locked = 1;
                 truncate_node(&dn);
         }
-        if (inode->i_blocks == 1) {
-                /* inernally call f2fs_put_page() */
-                set_new_dnode(&dn, inode, page, page, ino);
-                truncate_node(&dn);
-        } else if (inode->i_blocks == 0) {
-                struct node_info ni;
-                get_node_info(sbi, inode->i_ino, &ni);
 
-                /* called after f2fs_new_inode() is failed */
-                BUG_ON(ni.blk_addr != NULL_ADDR);
-                f2fs_put_page(page, 1);
-        } else {
-                BUG();
-        }
+        /* 0 is possible, after f2fs_new_inode() is failed */
+        BUG_ON(inode->i_blocks != 0 && inode->i_blocks != 1);
+        set_new_dnode(&dn, inode, page, page, ino);
+        truncate_node(&dn);
+
         mutex_unlock_op(sbi, NODE_TRUNC);
         return 0;
 }
@@ -845,6 +839,7 @@ struct page *new_node_page(struct dnode_of_data *dn, unsigned int ofs)
         return page;
 
 fail:
+        clear_node_page_dirty(page);
         f2fs_put_page(page, 1);
         return ERR_PTR(err);
 }