From: Pascal Schmidt The below patch is needed to support ATAPI MO drives in 2.6. ide-scsi doesn't work any more for this, so ide-cd has to take over the job of running the MO drive. Without this, there is no way to write to an ATAPI MO drive. This patch has been discussed with Linus and Jens already around test9 time and it was agreed this is the right way to go about it. I have rediffed it against 2.6.0. Compiles, runs, works just fine for me. --- drivers/cdrom/cdrom.c | 3 ++- drivers/ide/ide-cd.c | 23 +++++++++++++++-------- 2 files changed, 17 insertions(+), 9 deletions(-) diff -puN drivers/cdrom/cdrom.c~atapi-mo-support drivers/cdrom/cdrom.c --- 25/drivers/cdrom/cdrom.c~atapi-mo-support 2004-01-07 19:11:14.000000000 -0800 +++ 25-akpm/drivers/cdrom/cdrom.c 2004-01-07 19:11:14.000000000 -0800 @@ -426,7 +426,8 @@ int cdrom_open(struct cdrom_device_info if ((fp->f_flags & O_NONBLOCK) && (cdi->options & CDO_USE_FFLAGS)) ret = cdi->ops->open(cdi, 1); else { - if ((fp->f_mode & FMODE_WRITE) && !CDROM_CAN(CDC_DVD_RAM)) + if ((fp->f_mode & FMODE_WRITE) && + !(CDROM_CAN(CDC_DVD_RAM) || CDROM_CAN(CDC_MO_DRIVE))) return -EROFS; ret = open_for_data(cdi); diff -puN drivers/ide/ide-cd.c~atapi-mo-support drivers/ide/ide-cd.c --- 25/drivers/ide/ide-cd.c~atapi-mo-support 2004-01-07 19:11:14.000000000 -0800 +++ 25-akpm/drivers/ide/ide-cd.c 2004-01-07 19:11:14.000000000 -0800 @@ -2242,6 +2242,7 @@ static int cdrom_read_toc(ide_drive_t *d struct atapi_toc_header hdr; struct atapi_toc_entry ent; } ms_tmp; + long last_written; if (toc == NULL) { /* Try to allocate space. */ @@ -2261,6 +2262,13 @@ static int cdrom_read_toc(ide_drive_t *d if (CDROM_STATE_FLAGS(drive)->toc_valid) return 0; + /* Try to get the total cdrom capacity. */ + stat = cdrom_read_capacity(drive, &toc->capacity, sense); + if (stat) + toc->capacity = 0x1fffff; + + set_capacity(drive->disk, toc->capacity * SECTORS_PER_FRAME); + /* First read just the header, so we know how long the TOC is. */ stat = cdrom_read_tocentry(drive, 0, 1, 0, (char *) &toc->hdr, sizeof(struct atapi_toc_header), sense); @@ -2368,13 +2376,11 @@ static int cdrom_read_toc(ide_drive_t *d toc->xa_flag = (ms_tmp.hdr.first_track != ms_tmp.hdr.last_track); /* Now try to get the total cdrom capacity. */ - stat = cdrom_get_last_written(cdi, (long *) &toc->capacity); - if (stat || !toc->capacity) - stat = cdrom_read_capacity(drive, &toc->capacity, sense); - if (stat) - toc->capacity = 0x1fffff; - - set_capacity(drive->disk, toc->capacity * SECTORS_PER_FRAME); + stat = cdrom_get_last_written(cdi, &last_written); + if (!stat && last_written) { + toc->capacity = last_written; + set_capacity(drive->disk, toc->capacity * SECTORS_PER_FRAME); + } /* Remember that we've read this stuff. */ CDROM_STATE_FLAGS(drive)->toc_valid = 1; @@ -3215,7 +3221,8 @@ int ide_cdrom_setup (ide_drive_t *drive) nslots = ide_cdrom_probe_capabilities (drive); - if (CDROM_CONFIG_FLAGS(drive)->dvd_ram) + if (CDROM_CONFIG_FLAGS(drive)->dvd_ram || + CDROM_CONFIG_FLAGS(drive)->mo_drive) set_disk_ro(drive->disk, 0); #if 0 _