f2fs: fix the potential mismatch between dir's i_size and i_blocks

This is the erroneous scenario.

                             i_size    on-disk i_size    i_blocks
__f2fs_add_link()             4096           4096           2
 get_new_data_page            8192           4096           3
 -ENOSPC = init_inode_metadata
 checkpoint                     -            4096           3
 POR and reboot

__f2fs_add_link()             4096           4096           3
 page = get_new_data_page (page->index = 1 by NEW_ADDR)
 add a dentry to the page successfully

f2fs_rmdir()
 f2fs_empty_dir()             4096           4096           3
 f2fs_unlink() goes, since there is no valid dentry due to i_size = 4096.
 But, still there is one dentry in page->index = 1.

So this patch moves the code to write dir->i_size into on-disk i_size in order
to sync dir's i_size, on-disk i_size, and its i_blocks.

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

diff --git a/fs/f2fs/dir.c b/fs/f2fs/dir.c
index 2b7c255..bfcb4ae 100644 (file)
--- a/fs/f2fs/dir.c
+++ b/fs/f2fs/dir.c
@@ -395,9 +395,6 @@ static void update_parent_metadata(struct inode *dir, struct inode *inode,
                set_inode_flag(F2FS_I(dir), FI_UPDATE_DIR);
        }
 
-       if (is_inode_flag_set(F2FS_I(dir), FI_UPDATE_DIR))
-               update_inode_page(dir);
-
        if (is_inode_flag_set(F2FS_I(inode), FI_INC_LINK))
                clear_inode_flag(F2FS_I(inode), FI_INC_LINK);
 }
@@ -511,7 +508,10 @@ add_dentry:
 
        update_parent_metadata(dir, inode, current_depth);
 fail:
-       clear_inode_flag(F2FS_I(dir), FI_UPDATE_DIR);
+       if (is_inode_flag_set(F2FS_I(dir), FI_UPDATE_DIR)) {
+               update_inode_page(dir);
+               clear_inode_flag(F2FS_I(dir), FI_UPDATE_DIR);
+       }
        kunmap(dentry_page);
        f2fs_put_page(dentry_page, 1);
        return err;