Commit f2a09af6 authored Sep 23, 2012 by Yongqiang Yang Committed by Theodore Ts'o Sep 23, 2012

ext4: check free inode count before allocating an inode



Recently, I ecountered some corrupted filesystems in which some
groups' free inode counts were 65535, it seemed that free inode
count was overflow.  This patch teaches ext4 to check free inode
count before allocaing an inode.

Signed-off-by: Yongqiang Yang <xiaoqiangnk@gmail.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

parent 838cd0cf

fs/ext4/ialloc.c

+9 −0

Original line number	Diff line number	Diff line
		@@ -697,6 +697,15 @@ struct inode ext4_new_inode(handle_t handle, struct inode *dir, umode_t mode,
		if (!gdp)
		goto fail;

		/*
		* Check free inodes count before loading bitmap.
		*/
		if (ext4_free_inodes_count(sb, gdp) == 0) {
		if (++group == ngroups)
		group = 0;
		continue;
		}

		brelse(inode_bitmap_bh);
		inode_bitmap_bh = ext4_read_inode_bitmap(sb, group);
		if (!inode_bitmap_bh)