Commit 699489bb authored by Jaegeuk Kim's avatar Jaegeuk Kim
Browse files

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: default avatarJaegeuk Kim <jaegeuk.kim@samsung.com>
parent 2d4d9fb5

fs/f2fs/data.c

+2 −0
Original line number Diff line number Diff line
@@ -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;

fs/f2fs/dir.c

+4 −5
Original line number Diff line number Diff line
@@ -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;

fs/f2fs/f2fs.h

+1 −0
Original line number Diff line number Diff line
@@ -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 */

};

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