commit 6d19c42b7cf81c39632b6d4dbc514e8449bcd346
Author: Nikanth Karthikesan <knikanth@suse.de>
Date:   Sun May 16 14:00:00 2010 -0400

    ext4: Prevent creation of files larger than RLIMIT_FSIZE using fallocate
    
    Currently using posix_fallocate one can bypass an RLIMIT_FSIZE limit
    and create a file larger than the limit. Add a check for that.
    
    Signed-off-by: Nikanth Karthikesan <knikanth@suse.de>
    Signed-off-by: Amit Arora <aarora@in.ibm.com>
    Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
index ee611da..8a8f9f0 100644
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -3545,6 +3545,11 @@ long ext4_fallocate(struct inode *inode,
 	 */
 	credits = ext4_chunk_trans_blocks(inode, max_blocks);
 	mutex_lock(&inode->i_mutex);
+	ret = inode_newsize_ok(inode, (len + offset));
+	if (ret) {
+		mutex_unlock(&inode->i_mutex);
+		return ret;
+	}
 retry:
 	while (ret >= 0 && ret < max_blocks) {
 		block = block + ret;