hfs on scsi device

[Masatake YAMATO]

Hi,

2.4.23 kernel shows oops when I've tried to mount hfs file system
on a CDROM in scsi CDROM drive. (Strictly speaking I'm using ide-scsi
kernel parameter.) I inspect this issue. 

This issue was reported and discussed this April:
http://www.ussg.iu.edu/hypermail/linux/kernel/0304.0/0365.html
http://marc.theaimsgroup.com/?l=linux-kernel&m=102890250915062&w=2


The symptom of oops is appeared in dmesg:

    kernel BUG at buffer.c:2518!
    ...

The line is in grow_buffers() function:

	/* Size must be multiple of hard sectorsize */
	if (size & (get_hardsect_size(dev)-1))
		BUG();

It seems that setting the block size is failed before the control reaches
this line.

With the following patch for linux-2.4.23/fs/hfs/super.c, you can avoid
the oops. The patch just checks the return value from set_blocksize.
If set_blocksize is failed, just return from the function(hfs_read_super). 

Masatake YAMATO
jet@xxxxxxxx

397a398
> 	int dev_blocksize;
409c410,415
< 	set_blocksize(dev, HFS_SECTOR_SIZE);
---
> 	if (set_blocksize(dev, HFS_SECTOR_SIZE) < 0) {
> 		dev_blocksize = get_hardsect_size(dev);
> 		hfs_warn("hfs_fs: unsupported device block size: %d\n",
> 			 dev_blocksize);
> 		goto bail3;
> 	}

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