Red Hat Bugzilla – Bug 47058
kernel get_last_block ioctl fails
Last modified: 2007-04-18 12:34:23 EDT
Description of Problem: On Fairfax, beta 1. parted tries to read the last block of the disk via the get_last_sector ioctl, which is failing. Looks like parted is fine, but the kernel implementation of get_last_sector is failing. How Reproducible: Always on aacraid (all I've tried so far). Steps to Reproduce: 1. Run fairfax beta1 installer (I'm using FTP installs) 2. Choose to use Disk Druid for partitioning. See screen gets screwed up with "read failed: Operation not permitted" messages. 3. Switch to VT4 and see: SCSI disk error: host 1 channel 0 id 0 lun 0 return code = 1 I/O error: dev 08:00, sector 35542272 get_last_sector ioctl: bread returned NULL. Similarly, doing: mknod /dev/sda parted /dev/sda print reproduces this quite easily. Actual Results: Can't partition the disk. Expected Results: Can partition the disk. Additional Information: Looks like the get_last_block ioctl is getting called, but doesn't work for some reason.
It's not a Linux bug. I believe it to be a bug in the PERC 2/Si firmware. A SCSI Read Capacity to a RAID10 logical drive with a 64K stripe size returns an odd number of sectors (in fact it's 64K*x+1). That can't be right. I'm pursuing this with Adaptec. -Matt
It's a bug in the aacraid driver which implements the READ CAPACITY command. Here's a patch which fixes it. Arjan, please apply. --- linux-2.4/drivers/scsi/aacraid/aachba.c~ Wed Jun 27 13:58:50 2001 +++ linux-2.4/drivers/scsi/aacraid/aachba.c Tue Jul 10 18:57:01 2001 @@ -663,7 +663,7 @@ char *cp; cmn_err( CE_DEBUG, "READ CAPACITY command" ); - capacity = fsa_dev_ptr->ContainerSize[ContainerId]; + capacity = fsa_dev_ptr->ContainerSize[ContainerId] - 1; cp = scsi_cmnd_ptr->request_buffer; cp[0] = ( capacity >> 24 ) & 0xff; cp[1] = ( capacity >> 16 ) & 0xff;
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