Commit d6320cbf authored Oct 01, 2014 by Jan Kara Committed by Theodore Ts'o Oct 01, 2014

ext4: fix mmap data corruption when blocksize < pagesize



Use truncate_isize_extended() when hole is being created in a file so that
->page_mkwrite() will get called for the partial tail page if it is
mmaped (see the first patch in the series for details).

Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Cc: stable@vger.kernel.org

parent 90a80202

fs/ext4/inode.c

+5 −1

Original line number	Diff line number	Diff line
		@@ -4514,8 +4514,12 @@ int ext4_setattr(struct dentry dentry, struct iattr attr)
		ext4_orphan_del(NULL, inode);
		goto err_out;
		}
		} else
		} else {
		loff_t oldsize = inode->i_size;

		i_size_write(inode, attr->ia_size);
		pagecache_isize_extended(inode, oldsize, inode->i_size);
		}

		/*
		* Blocks are going to be removed from the inode. Wait