Commit bd43df02 authored Jan 25, 2013 by Jaegeuk Kim

f2fs: cover global locks for reserve_new_block



The fill_zero() from fallocate() calls get_new_data_page() in which calls
reserve_new_block().
The reserve_new_block() should be covered by *DATA_NEW*, one of global locks.
And also, before getting the lock, we should check free sections by calling
f2fs_balance_fs().

If we break this rule, f2fs is able to face with out-of-control free space
management and fall into infinite loop like the following scenario as well.

[f2fs_sync_fs()]             [fallocate()]
 - write_checkpoint()        - fill_zero()
  - block_operations()        - get_new_data_page()
   : grab NODE_NEW             - get_dnode_of_data()
                                : get locked dirty node page
    - sync_node_pages()
                                : try to grab NODE_NEW for data allocation
     : trylock and skip the dirty node page
   : call sync_node_pages() repeatedly in order to flush all the dirty node
     pages!

In order to avoid this, we should grab another global lock such as DATA_NEW
before calling get_new_data_page() in fill_zero().

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

parent 577e3495

fs/f2fs/file.c

+5 −0

Original line number	Diff line number	Diff line
		@@ -387,12 +387,17 @@ const struct inode_operations f2fs_file_inode_operations = {
		static void fill_zero(struct inode *inode, pgoff_t index,
		loff_t start, loff_t len)
		{
		struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
		struct page *page;

		if (!len)
		return;

		f2fs_balance_fs(sbi);

		mutex_lock_op(sbi, DATA_NEW);
		page = get_new_data_page(inode, index, false);
		mutex_unlock_op(sbi, DATA_NEW);

		if (!IS_ERR(page)) {
		wait_on_page_writeback(page);