[PATCH v4 rebase 00/10] Fix cdrom autoclose

[Michal Suchanek]

Hello,

there is cdrom autoclose feature that is supposed to close the tray,
wait for the disc to become ready, and then open the device.

This used to work in ancient times. Then in old times there was a hack
in util-linux which worked around the breakage which probably resulted
from switching to scsi emulation.

Currently util-linux maintainer refuses to merge another hack on the
basis that kernel still has the feature so it should be fixed there.
The code needs not be replicated in every userspace utility like mount
or dd which has no business knowing which devices are CD-roms and where
the autoclose setting is in the kernel.

This is rebase on top of current master.

Also it seems that most people think that this is fix for WMware because
there is one patch dealing with WMware.

This is fix for Linux.

Expected (ca Linux 2.4):

eject
< put CD on tray >
mount /dev/cdrom
...
< cdrom now mounted >

Actual:
mount: /mnt: no medium found on /dev/sr0.

Thanks

Michal

v3:
- change the VMware workaround to use blacklist flag
- use exported function instead of ioctl
v4:
- fix crash reported by kernel test robot
- fix the debug message logic while refactoring cdrom_open
- move repeated code out of __blkdev_get

Link: https://lore.kernel.org/lkml/cover.1571834862.git.msuchanek@xxxxxxx/
Link: https://lore.kernel.org/lkml/cover.1513263482.git.msuchanek@xxxxxxx/

Michal Suchanek (10):
  cdrom: add poll_event_interruptible
  cdrom: factor out common open_for_* code
  cdrom: wait for the tray to close
  cdrom: export autoclose logic as a separate function
  cdrom: unify log messages.
  bdev: reset first_open when looping in __blkget_dev
  bdev: separate parts of __blkdev_get as helper functions
  bdev: add open_finish
  scsi: blacklist: add VMware ESXi cdrom - broken tray emulation
  scsi: sr: wait for the medium to become ready

 Documentation/filesystems/locking.rst |   2 +
 drivers/cdrom/cdrom.c                 | 471 +++++++++++++-------------
 drivers/scsi/scsi_devinfo.c           |  15 +-
 drivers/scsi/sr.c                     |  60 +++-
 fs/block_dev.c                        |  72 ++--
 include/linux/blkdev.h                |   1 +
 include/linux/cdrom.h                 |   1 +
 include/scsi/scsi_devinfo.h           |   7 +-
 8 files changed, 357 insertions(+), 272 deletions(-)

-- 
2.23.0