Commit 94460093 authored Jun 06, 2008 by Josef Bacik Committed by Theodore Ts'o Jun 06, 2008

ext4: fix online resize bug



There is a bug when we are trying to verify that the reserve inode's
double indirect blocks point back to the primary gdt blocks.  The fix is
obvious, we need to mod the gdb count by the addr's per block.  This was
verified using the same testcase as with the ext3 equivalent of this
patch.

Signed-off-by: Josef Bacik <jbacik@redhat.com>
Signed-off-by: Mingming Cao <cmm@us.ibm.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

parent 0bf7e837

fs/ext4/resize.c

+2 −1

Original line number	Diff line number	Diff line
		@@ -563,7 +563,8 @@ static int reserve_backup_gdb(handle_t handle, struct inode inode,
		}

		blk = EXT4_SB(sb)->s_sbh->b_blocknr + 1 + EXT4_SB(sb)->s_gdb_count;
		data = (__le32 *)dind->b_data + EXT4_SB(sb)->s_gdb_count;
		data = (__le32 *)dind->b_data + (EXT4_SB(sb)->s_gdb_count %
		EXT4_ADDR_PER_BLOCK(sb));
		end = (__le32 *)dind->b_data + EXT4_ADDR_PER_BLOCK(sb);

		/* Get each reserved primary GDT block and verify it holds backups */

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