Commit afcb7ca0 authored by Jaegeuk Kim's avatar Jaegeuk Kim
Browse files

f2fs: check truncation of mapping after lock_page 



We call lock_page when we need to update a page after readpage.
Between grab and lock page, the page can be truncated by other thread.
So, we should check the page after lock_page whether it was truncated or not.

Signed-off-by: default avatarJaegeuk Kim <jaegeuk.kim@samsung.com>
parent 55008d84

fs/f2fs/checkpoint.c

+4 −0
Original line number Diff line number Diff line
@@ -65,6 +65,10 @@ repeat: 
		goto repeat;



	lock_page(page);

	if (page->mapping != mapping) {

		f2fs_put_page(page, 1);

		goto repeat;

	}

out:

	mark_page_accessed(page);

	return page;

fs/f2fs/data.c

+15 −3
Original line number Diff line number Diff line
@@ -240,7 +240,7 @@ struct page *get_lock_data_page(struct inode *inode, pgoff_t index) 


	if (dn.data_blkaddr == NULL_ADDR)

		return ERR_PTR(-ENOENT);



repeat:

	page = grab_cache_page(mapping, index);

	if (!page)

		return ERR_PTR(-ENOMEM);
@@ -260,6 +260,10 @@ struct page *get_lock_data_page(struct inode *inode, pgoff_t index) 
		f2fs_put_page(page, 1);

		return ERR_PTR(-EIO);

	}

	if (page->mapping != mapping) {

		f2fs_put_page(page, 1);

		goto repeat;

	}

	return page;

}
@@ -291,7 +295,7 @@ struct page *get_new_data_page(struct inode *inode, pgoff_t index, 
		}

	}

	f2fs_put_dnode(&dn);



repeat:

	page = grab_cache_page(mapping, index);

	if (!page)

		return ERR_PTR(-ENOMEM);
@@ -311,6 +315,10 @@ struct page *get_new_data_page(struct inode *inode, pgoff_t index, 
			f2fs_put_page(page, 1);

			return ERR_PTR(-EIO);

		}

		if (page->mapping != mapping) {

			f2fs_put_page(page, 1);

			goto repeat;

		}

	}



	if (new_i_size &&
@@ -611,7 +619,7 @@ static int f2fs_write_begin(struct file *file, struct address_space *mapping, 
	*fsdata = NULL;



	f2fs_balance_fs(sbi);



repeat:

	page = grab_cache_page_write_begin(mapping, index, flags);

	if (!page)

		return -ENOMEM;
@@ -656,6 +664,10 @@ static int f2fs_write_begin(struct file *file, struct address_space *mapping, 
			f2fs_put_page(page, 1);

			return -EIO;

		}

		if (page->mapping != mapping) {

			f2fs_put_page(page, 1);

			goto repeat;

		}

	}

out:

	SetPageUptodate(page);

fs/f2fs/file.c

+4 −0
Original line number Diff line number Diff line
@@ -217,6 +217,10 @@ static void truncate_partial_data_page(struct inode *inode, u64 from) 
		return;



	lock_page(page);

	if (page->mapping != inode->i_mapping) {

		f2fs_put_page(page, 1);

		return;

	}

	wait_on_page_writeback(page);

	zero_user(page, offset, PAGE_CACHE_SIZE - offset);

	set_page_dirty(page);

fs/f2fs/node.c

+16 −4
Original line number Diff line number Diff line
@@ -674,6 +674,7 @@ fail: 
int truncate_inode_blocks(struct inode *inode, pgoff_t from)

{

	struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);

	struct address_space *node_mapping = sbi->node_inode->i_mapping;

	int err = 0, cont = 1;

	int level, offset[4], noffset[4];

	unsigned int nofs = 0;
@@ -684,7 +685,7 @@ int truncate_inode_blocks(struct inode *inode, pgoff_t from) 
	trace_f2fs_truncate_inode_blocks_enter(inode, from);



	level = get_node_path(from, offset, noffset);



restart:

	page = get_node_page(sbi, inode->i_ino);

	if (IS_ERR(page)) {

		trace_f2fs_truncate_inode_blocks_exit(inode, PTR_ERR(page));
@@ -748,6 +749,10 @@ skip_partial: 
		if (offset[1] == 0 &&

				rn->i.i_nid[offset[0] - NODE_DIR1_BLOCK]) {

			lock_page(page);

			if (page->mapping != node_mapping) {

				f2fs_put_page(page, 1);

				goto restart;

			}

			wait_on_page_writeback(page);

			rn->i.i_nid[offset[0] - NODE_DIR1_BLOCK] = 0;

			set_page_dirty(page);
@@ -916,7 +921,7 @@ struct page *get_node_page(struct f2fs_sb_info *sbi, pgoff_t nid) 
	struct address_space *mapping = sbi->node_inode->i_mapping;

	struct page *page;

	int err;



repeat:

	page = grab_cache_page(mapping, nid);

	if (!page)

		return ERR_PTR(-ENOMEM);
@@ -932,6 +937,10 @@ struct page *get_node_page(struct f2fs_sb_info *sbi, pgoff_t nid) 
		f2fs_put_page(page, 1);

		return ERR_PTR(-EIO);

	}

	if (page->mapping != mapping) {

		f2fs_put_page(page, 1);

		goto repeat;

	}

got_it:

	BUG_ON(nid != nid_of_node(page));

	mark_page_accessed(page);
@@ -955,7 +964,7 @@ struct page *get_node_page_ra(struct page *parent, int start) 
	nid = get_nid(parent, start, false);

	if (!nid)

		return ERR_PTR(-ENOENT);



repeat:

	page = grab_cache_page(mapping, nid);

	if (!page)

		return ERR_PTR(-ENOMEM);
@@ -981,7 +990,10 @@ struct page *get_node_page_ra(struct page *parent, int start) 
	blk_finish_plug(&plug);



	lock_page(page);



	if (page->mapping != mapping) {

		f2fs_put_page(page, 1);

		goto repeat;

	}

page_hit:

	if (!PageUptodate(page)) {

		f2fs_put_page(page, 1);

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