[sorry for the resend, I used a wrong mailing list address] The set of use cases for SG_IO is quite variable that no single filter can accomodate all of them. The current filter is tailored very much to CD burning, and includes many MMC-specific commands that may have other meanings in different standards. Someone may want to remove those commands; at the same time, people that trust their users may want to add persistent reservations, trim/discard, or even access to vendor-specific commands. Filters used to be mutable via sysfs, but the implementation was never enabled. Add it back, and let the admin set this up per device. The ideal is that we would be much more restrictive by default and give root the ability to override this both globally and per-device. But this piece of the policy should probably be implemented in userspace for better backwards compatibility. In the meanwhile, this patch series provides the sysfs knob. It is a tweaked revert of commit 018e044 (block: get rid of queue-private command filter, 2009-06-26). Paolo Bonzini (3): block: add back queue-private command filter scsi: create an all-zero filter for scanners block: add back command filter modification via sysfs Documentation/block/queue-sysfs.txt | 16 +++++ block/Kconfig | 10 +++ block/blk-sysfs.c | 43 +++++++++++++ block/bsg.c | 2 +- block/scsi_ioctl.c | 117 +++++++++++++++++++++++++++++++---- drivers/scsi/scsi_scan.c | 6 ++- drivers/scsi/sg.c | 7 +- include/linux/blkdev.h | 31 +++++++++- 8 files changed, 213 insertions(+), 19 deletions(-) -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
