Messages in this thread | | | Date | Sat, 12 Sep 1998 16:43:57 -0700 | From | Gordon Chaffee <> | Subject | Re: Bug in mounting routines of atapi-cdroms |
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Chris Ricker writes: > The problem he's describing sounds like the same one I have that we hunted > down a couple of weeks ago (the changes in fs/isofs/inode.c between 2.1.101 > and 2.1.102). > > Sorry, I'd been meaning to send this to the list since I can't tell from the > Maintainers file who does isofs (is that you, Gordon?) but then got busy > with school and forgot about it. At any rate, the changes to > fs/isofs/inode.c between 2.1.101 and 2.1.102 break cd-rom access for me and > a few other people. They cause mount attempts of the cdrom to hang forever > (on all cds, which work fine under 2.0.x / 2.1.x where x <= 101 , so it's > not a problem with the images being bad). This is still true as of > 2.1.122-pre2. So far, I haven't been able to narrow it down any farther than > that set of changes. Isofs people, please ask away if you need more info., > have magic patches, etc.
I would certainly appreciate if you could send some data on any failing CD images with:
dd if=/dev/cdrom bs=1024 count=2048 | gzip -c -f > cddata.gz
I have a number of images I use for testing purposes, and I'm happy to add any images that cause problems to my tests. If you have something that doesn't work with isofs, I would definitely appreciate getting this data.
I just tried to mount a real CD (as opposed to loopback mounted images that I normally test with), and I ran into trouble. What I get with 2.1.121 when I try to mount a CD is:
mount -t iso9660 /dev/hdb /cdrom mount: /dev/cdrom has wrong major or minor number
The CD is a NEC multi-disk CD changer. /proc/ide/hdb/model: NEC CD-ROM DRIVE:253 /proc/ide/hdb/media: cdrom
Thinking that it may have set the slot wrong somehow, I tried setting it:
% cdchange -v /dev/hdb 1 cdchange: open failed for `/dev/hdb': No such device This coincides with the strace:
... open("/dev/hdb", O_RDONLY|O_NONBLOCK) = -1 ENODEV (Operation not supported by device) ...
I have it the IDE CD driver compiled into the kernel, from my .config: CONFIG_BLK_DEV_IDEDISK=y CONFIG_BLK_DEV_IDECD=y
I haven't yet tried to determine when this started failing. It has been awhile since I last used the cd reader, so I don't know if this is new. It was probably back in the 2.1.80 timeframe I last tried it.
I'll see if I can come up with some better debugging information.
- Gordon
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