Bug 1930
| Summary: | 2.6.1 fails to mount large iso9660 dvd discs with ATAPI drivers, succeeds with SCSI. | ||
|---|---|---|---|
| Product: | IO/Storage | Reporter: | Jeff Gardner (j_e_gardner) |
| Component: | IDE | Assignee: | Luca Tettamanti (kronos.it) |
| Status: | CLOSED CODE_FIX | ||
| Severity: | normal | CC: | kaminsky, shensa |
| Priority: | P2 | ||
| Hardware: | i386 | ||
| OS: | Linux | ||
| Kernel Version: | 2.6.1 | Subsystem: | |
| Regression: | --- | Bisected commit-id: | |
| Attachments: |
dmesg for linux-2.6.3-ide
Commands used to burn iso discs. Output from a few tests I made on 2 different dvd's and 2 different kernels. Fix for the bug |
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Description
Jeff Gardner
2004-01-21 16:28:02 UTC
This looks like an isofs problem, not IDE. Could you please do: dd if=/dev/cdroms/cdrom0 of=iso.img bs=1M count=4 and compress and mail iso.img.gz to me? I thought about filing it as an iso9660 bug, but the disc won't mount with atapi drivers. It will mount perfectly with scsi-emulation on the drive. I dunno. Let me know what else I can do. Thanks. Created attachment 2242 [details]
dmesg for linux-2.6.3-ide
dmesg for 2.6.3. This kernel also fails to mount dvd's containing an iso9660
filesystem larger than (roughly) 3028 Mb.
Created attachment 2243 [details]
Commands used to burn iso discs.
After the first two burnings, I could still mount the dvd (~2.8 Gb) After the
third, (~4.2 Gb) I could no longer mount the dvd.
Created attachment 2244 [details]
Output from a few tests I made on 2 different dvd's and 2 different kernels.
It's interesting how ide capacity showed the same value for the large AND the
small dvd's.
Okay... I've tried everything on 2.6.1, 2.6.2, and now 2.6.3. The only thing I've been able to find out is that the cutoff for ide mounting of my iso9660 dvd's is about 3028 Mb. I don't have the patience to narrow it any further than that. (by burning REALLY small files starting around 2995 Mb) Who knows, maybe I'll get so tired of rebooting that I'll eventually try it. :-) If anybody has any ideas about what else I could do to trace the problem, I'll be happy to try!!!! Above are some of the results I've generated with help from Andrew and Jens. Thanks, guys, Jeff Hi, I got the very same problem, Andy Polyakov made the following diagnosis: --- begin --- > I'm having a strange (at least for me) problem burning multisession > DVD+R media: the dvd becomes unreadable after the 3rd session is burned. I have all reasons to believe that it rather has everything to do with position of last session, than with the exact number of sessions. I also have all reasons to believe that it's rather ide-cd.c bug than isofs. In other words this problem was already reported to me, but I didn't have time to bring it up with linux-kernel people yet. > mount refuses to do its work, and kernel says: > > Unable to identify CD-ROM format. > > Note that there isn't any read error, so the kernel is simply unable to > locate the primary volume descriptor. The keywords for this problem are: > growisofs -M /dev/hdc -J -r <files> (-Z for the first session) ^^^ ide-cd.c is involved [it's no problem with sr.c if unit is routed through ide-scsi.c]... > This is the output of dvd+rw-mediainfo: > ... > Multi-session Info: #3@1339392 ^^^^^^^ ... and last recorded session starts beyond LBA #1152000, which corresponds ~2.2GB. What's so special about 1152000 (besides that it reminds highest posible bitrate for serial port:-) It's 256 times 60 times 75. What's so special about these numbers? 256 is amount of interger values which can be represented with 8-bit number, 60 is amount of seconds in minute and 75 is amount of frames in one second of CD-DA. Yes, it's about conversion from MSF to LBA suffering from overflow around 2.2GB. In the nutshell the problem is that drivers/ide/ide-cd.c always pull TOC in MSF format and then attempts to convert it to LBA. If last session is recorded beyond 1152000, isofs driver will be led by ide-cd driver to belief that volume descriptor resides at 1152000, which in turn results in "unable to identify CD-ROM format" message logged upon mount attempt. As fast-acting remedy I can suggest to route your unit through ide-scsi. The way it was under 2.4. Even though it's declared unsupported it actually still works in 2.6 (I for one still use it). And once ide-cd.c is fixed you'll be able to revert back to officially recommended path. A. --- end --- So it's a bug in ide-cd.c HTH, Luca Awesome! Thanks for finding that...it has been awhile and I'm glad it wasn't just me. Thanks Again, Jeff (je_fro) *** Bug 3882 has been marked as a duplicate of this bug. *** Created attachment 4283 [details]
Fix for the bug
Patch against 2.6.9, applies with offset to 2.6.10-rc3.
Patch has been sent to Linus and will show up in 2.6.10-rc4. Yay!!! It works...thank you Luca! Here is some information you may find useful as well... # dvd+rw-mediainfo /dev/hdc INQUIRY: [LITE-ON ][DVDRW SOHW-1633S][BS0C] GET [CURRENT] CONFIGURATION: Mounted Media: 1Ah, DVD+RW Media ID: RICOHJPN/W11 Current Write Speed: 4.0x1385=5540KB/s Write Speed #0: 4.0x1385=5540KB/s GET [CURRENT] PERFORMANCE: Write Performance: 4.0x1385=5540KB/s@[0 -> 2295103] Speed Descriptor#0: 00/2295103 R@8.0x1385=11072KB/s W@4.0x1385=5540KB/s READ DVD STRUCTURE[#0h]: Media Book Type: 92h, DVD+RW book [revision 2] Legacy lead-out at: 2295104*2KB=4700372992 READ DISC INFORMATION: Disc status: complete Number of Sessions: 1 State of Last Session: complete Number of Tracks: 1 BG Format Status: suspended READ TRACK INFORMATION[#1]: Track State: complete Track Start Address: 0*2KB Free Blocks: 0*2KB Track Size: 2295104*2KB FABRICATED TOC: Track#1 : 14@0 Track#AA : 14@2295104 Multi-session Info: #1@0 READ CAPACITY: 2295104*2048=4700372992 |