Commit 2856922c authored Jun 20, 2008 by Frederic Bohe Committed by Theodore Ts'o Jun 20, 2008

Ext4: Fix online resize block group descriptor corruption



This is the patch for the group descriptor table corruption during
online resize pointed out by Theodore Tso.  The problem was caused by
the fact that the ext4 group descriptor can be either 32 or 64 bytes
long.  Only the 64 bytes structure was taken into account.

Signed-off-by: Frederic Bohe <frederic.bohe@bull.net>
Signed-off-by: Mingming Cao <cmm@us.ibm.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

parent 5dd34572

fs/ext4/resize.c

+2 −1

Original line number	Diff line number	Diff line
		@@ -855,7 +855,8 @@ int ext4_group_add(struct super_block sb, struct ext4_new_group_data input)
		*/

		/* Update group descriptor block for new group */
		gdp = (struct ext4_group_desc *)primary->b_data + gdb_off;
		gdp = (struct ext4_group_desc )((char )primary->b_data +
		gdb_off * EXT4_DESC_SIZE(sb));

		ext4_block_bitmap_set(sb, gdp, input->block_bitmap); /* LV FIXME */
		ext4_inode_bitmap_set(sb, gdp, input->inode_bitmap); /* LV FIXME */

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