f2fs: sync dir->i_size with its block allocation

If new dentry block is allocated and its i_size is updated, we should update
its inode block together in order to sync i_size and its block allocation.
Otherwise, we can loose additional dentry block due to the unconsistent i_size.

Errorneous Scenario
-------------------

In the recovery routine,
 - recovery_dentry
 | - __f2fs_add_link
 | | - get_new_data_page
 | | | - i_size_write(new_i_size)
 | | | - mark_inode_dirty_sync(dir)
 | | - update_parent_metadata
 | | | - mark_inode_dirty(dir)
 |
 - write_checkpoint
   - sync_dirty_dir_inodes
     - filemap_flush(dentry_blocks)
       - f2fs_write_data_page
         - skip to write the last dentry block due to index < i_size

In the above flow, new_i_size is not updated to its inode block so that the
last dentry block will be lost accordingly.

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

diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index 93917e3..5b145fc 100644 (file)
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -339,6 +339,8 @@ repeat:
        if (new_i_size &&
                i_size_read(inode) < ((index + 1) << PAGE_CACHE_SHIFT)) {
                i_size_write(inode, ((index + 1) << PAGE_CACHE_SHIFT));
+               /* Only the directory inode sets new_i_size */
+               set_inode_flag(F2FS_I(inode), FI_UPDATE_DIR);
                mark_inode_dirty_sync(inode);
        }
        return page;

diff --git a/fs/f2fs/dir.c b/fs/f2fs/dir.c
index eaea5b5..69ca049 100644 (file)
--- a/fs/f2fs/dir.c
+++ b/fs/f2fs/dir.c
@@ -370,22 +370,20 @@ error:
 static void update_parent_metadata(struct inode *dir, struct inode *inode,
                                                unsigned int current_depth)
 {
-       bool need_dir_update = false;
-
        if (is_inode_flag_set(F2FS_I(inode), FI_NEW_INODE)) {
                if (S_ISDIR(inode->i_mode)) {
                        inc_nlink(dir);
-                       need_dir_update = true;
+                       set_inode_flag(F2FS_I(dir), FI_UPDATE_DIR);
                }
                clear_inode_flag(F2FS_I(inode), FI_NEW_INODE);
        }
        dir->i_mtime = dir->i_ctime = CURRENT_TIME;
        if (F2FS_I(dir)->i_current_depth != current_depth) {
                F2FS_I(dir)->i_current_depth = current_depth;
-               need_dir_update = true;
+               set_inode_flag(F2FS_I(dir), FI_UPDATE_DIR);
        }
 
-       if (need_dir_update)
+       if (is_inode_flag_set(F2FS_I(dir), FI_UPDATE_DIR))
                update_inode_page(dir);
        else
                mark_inode_dirty(dir);
@@ -502,6 +500,7 @@ add_dentry:
 
        update_parent_metadata(dir, inode, current_depth);
 fail:
+       clear_inode_flag(F2FS_I(dir), FI_UPDATE_DIR);
        kunmap(dentry_page);
        f2fs_put_page(dentry_page, 1);
        return err;

diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index c344a4d..27edf59 100644 (file)
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -859,6 +859,7 @@ enum {
        FI_INC_LINK,            /* need to increment i_nlink */
        FI_ACL_MODE,            /* indicate acl mode */
        FI_NO_ALLOC,            /* should not allocate any blocks */
+       FI_UPDATE_DIR,          /* should update inode block for consistency */
        FI_DELAY_IPUT,          /* used for the recovery */
 };