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Commit 94460093 authored by Josef Bacik's avatar Josef Bacik Committed by Theodore Ts'o
Browse files

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: default avatarJosef Bacik <jbacik@redhat.com>
Signed-off-by: default avatarMingming Cao <cmm@us.ibm.com>
Signed-off-by: default avatar"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 */