f2fs: handle errors correctly during f2fs_reserve_block

The get_dnode_of_data nullifies inode and node page when error is occurred.

There are two cases that passes inode page into get_dnode_of_data().

1. make_empty_dir()
    -> get_new_data_page()
      -> f2fs_reserve_block(ipage)
	-> get_dnode_of_data()

2. f2fs_convert_inline_data()
    -> __f2fs_convert_inline_data()
      -> f2fs_reserve_block(ipage)
	-> get_dnode_of_data()

This patch adds correct error handling codes when get_dnode_of_data() returns
an error.

At first, f2fs_reserve_block() calls f2fs_put_dnode() whenever reserve_new_block
returns an error.
So, the rule of f2fs_reserve_block() is to nullify inode page when there is any
error internally.

Finally, two callers of f2fs_reserve_block() should call f2fs_put_dnode()
appropriately if they got an error since successful f2fs_reserve_block().

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

1 files changed, 4 insertions, 3 deletions

diff --git a/fs/f2fs/dir.c b/fs/f2fs/dir.c
index 6da77e5..f815ca0 100644
--- a/fs/f2fs/dir.c
+++ b/fs/f2fs/dir.c
@@ -342,11 +342,11 @@ static struct page *init_inode_metadata(struct inode *inode,
 
 		err = f2fs_init_acl(inode, dir, page);
 		if (err)
-			goto error;
+			goto put_error;
 
 		err = f2fs_init_security(inode, dir, name, page);
 		if (err)
-			goto error;
+			goto put_error;
 
 		wait_on_page_writeback(page);
 	} else {
@@ -370,8 +370,9 @@ static struct page *init_inode_metadata(struct inode *inode,
 	}
 	return page;
 
-error:
+put_error:
 	f2fs_put_page(page, 1);
+error:
 	remove_inode_page(inode);
 	return ERR_PTR(err);
 }